1 //===--- SemaChecking.cpp - Extra Semantic Checking -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements extra semantic analysis beyond what is enforced
11 // by the C type system.
13 //===----------------------------------------------------------------------===//
15 #include "clang/Sema/SemaInternal.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/CharUnits.h"
18 #include "clang/AST/DeclCXX.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/EvaluatedExprVisitor.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/ExprCXX.h"
23 #include "clang/AST/ExprObjC.h"
24 #include "clang/AST/ExprOpenMP.h"
25 #include "clang/AST/StmtCXX.h"
26 #include "clang/AST/StmtObjC.h"
27 #include "clang/Analysis/Analyses/FormatString.h"
28 #include "clang/Basic/CharInfo.h"
29 #include "clang/Basic/TargetBuiltins.h"
30 #include "clang/Basic/TargetInfo.h"
31 #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
32 #include "clang/Sema/Initialization.h"
33 #include "clang/Sema/Lookup.h"
34 #include "clang/Sema/ScopeInfo.h"
35 #include "clang/Sema/Sema.h"
36 #include "llvm/ADT/STLExtras.h"
37 #include "llvm/ADT/SmallBitVector.h"
38 #include "llvm/ADT/SmallString.h"
39 #include "llvm/Support/Format.h"
40 #include "llvm/Support/Locale.h"
41 #include "llvm/Support/ConvertUTF.h"
42 #include "llvm/Support/raw_ostream.h"
45 using namespace clang;
48 SourceLocation Sema::getLocationOfStringLiteralByte(const StringLiteral *SL,
49 unsigned ByteNo) const {
50 return SL->getLocationOfByte(ByteNo, getSourceManager(), LangOpts,
51 Context.getTargetInfo());
54 /// Checks that a call expression's argument count is the desired number.
55 /// This is useful when doing custom type-checking. Returns true on error.
56 static bool checkArgCount(Sema &S, CallExpr *call, unsigned desiredArgCount) {
57 unsigned argCount = call->getNumArgs();
58 if (argCount == desiredArgCount) return false;
60 if (argCount < desiredArgCount)
61 return S.Diag(call->getLocEnd(), diag::err_typecheck_call_too_few_args)
62 << 0 /*function call*/ << desiredArgCount << argCount
63 << call->getSourceRange();
65 // Highlight all the excess arguments.
66 SourceRange range(call->getArg(desiredArgCount)->getLocStart(),
67 call->getArg(argCount - 1)->getLocEnd());
69 return S.Diag(range.getBegin(), diag::err_typecheck_call_too_many_args)
70 << 0 /*function call*/ << desiredArgCount << argCount
71 << call->getArg(1)->getSourceRange();
74 /// Check that the first argument to __builtin_annotation is an integer
75 /// and the second argument is a non-wide string literal.
76 static bool SemaBuiltinAnnotation(Sema &S, CallExpr *TheCall) {
77 if (checkArgCount(S, TheCall, 2))
80 // First argument should be an integer.
81 Expr *ValArg = TheCall->getArg(0);
82 QualType Ty = ValArg->getType();
83 if (!Ty->isIntegerType()) {
84 S.Diag(ValArg->getLocStart(), diag::err_builtin_annotation_first_arg)
85 << ValArg->getSourceRange();
89 // Second argument should be a constant string.
90 Expr *StrArg = TheCall->getArg(1)->IgnoreParenCasts();
91 StringLiteral *Literal = dyn_cast<StringLiteral>(StrArg);
92 if (!Literal || !Literal->isAscii()) {
93 S.Diag(StrArg->getLocStart(), diag::err_builtin_annotation_second_arg)
94 << StrArg->getSourceRange();
102 /// Check that the argument to __builtin_addressof is a glvalue, and set the
103 /// result type to the corresponding pointer type.
104 static bool SemaBuiltinAddressof(Sema &S, CallExpr *TheCall) {
105 if (checkArgCount(S, TheCall, 1))
108 ExprResult Arg(TheCall->getArg(0));
109 QualType ResultType = S.CheckAddressOfOperand(Arg, TheCall->getLocStart());
110 if (ResultType.isNull())
113 TheCall->setArg(0, Arg.get());
114 TheCall->setType(ResultType);
118 static bool SemaBuiltinOverflow(Sema &S, CallExpr *TheCall) {
119 if (checkArgCount(S, TheCall, 3))
122 // First two arguments should be integers.
123 for (unsigned I = 0; I < 2; ++I) {
124 Expr *Arg = TheCall->getArg(I);
125 QualType Ty = Arg->getType();
126 if (!Ty->isIntegerType()) {
127 S.Diag(Arg->getLocStart(), diag::err_overflow_builtin_must_be_int)
128 << Ty << Arg->getSourceRange();
133 // Third argument should be a pointer to a non-const integer.
134 // IRGen correctly handles volatile, restrict, and address spaces, and
135 // the other qualifiers aren't possible.
137 Expr *Arg = TheCall->getArg(2);
138 QualType Ty = Arg->getType();
139 const auto *PtrTy = Ty->getAs<PointerType>();
140 if (!(PtrTy && PtrTy->getPointeeType()->isIntegerType() &&
141 !PtrTy->getPointeeType().isConstQualified())) {
142 S.Diag(Arg->getLocStart(), diag::err_overflow_builtin_must_be_ptr_int)
143 << Ty << Arg->getSourceRange();
151 static void SemaBuiltinMemChkCall(Sema &S, FunctionDecl *FDecl,
152 CallExpr *TheCall, unsigned SizeIdx,
153 unsigned DstSizeIdx) {
154 if (TheCall->getNumArgs() <= SizeIdx ||
155 TheCall->getNumArgs() <= DstSizeIdx)
158 const Expr *SizeArg = TheCall->getArg(SizeIdx);
159 const Expr *DstSizeArg = TheCall->getArg(DstSizeIdx);
161 llvm::APSInt Size, DstSize;
163 // find out if both sizes are known at compile time
164 if (!SizeArg->EvaluateAsInt(Size, S.Context) ||
165 !DstSizeArg->EvaluateAsInt(DstSize, S.Context))
168 if (Size.ule(DstSize))
171 // confirmed overflow so generate the diagnostic.
172 IdentifierInfo *FnName = FDecl->getIdentifier();
173 SourceLocation SL = TheCall->getLocStart();
174 SourceRange SR = TheCall->getSourceRange();
176 S.Diag(SL, diag::warn_memcpy_chk_overflow) << SR << FnName;
179 static bool SemaBuiltinCallWithStaticChain(Sema &S, CallExpr *BuiltinCall) {
180 if (checkArgCount(S, BuiltinCall, 2))
183 SourceLocation BuiltinLoc = BuiltinCall->getLocStart();
184 Expr *Builtin = BuiltinCall->getCallee()->IgnoreImpCasts();
185 Expr *Call = BuiltinCall->getArg(0);
186 Expr *Chain = BuiltinCall->getArg(1);
188 if (Call->getStmtClass() != Stmt::CallExprClass) {
189 S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_not_call)
190 << Call->getSourceRange();
194 auto CE = cast<CallExpr>(Call);
195 if (CE->getCallee()->getType()->isBlockPointerType()) {
196 S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_block_call)
197 << Call->getSourceRange();
201 const Decl *TargetDecl = CE->getCalleeDecl();
202 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
203 if (FD->getBuiltinID()) {
204 S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_builtin_call)
205 << Call->getSourceRange();
209 if (isa<CXXPseudoDestructorExpr>(CE->getCallee()->IgnoreParens())) {
210 S.Diag(BuiltinLoc, diag::err_first_argument_to_cwsc_pdtor_call)
211 << Call->getSourceRange();
215 ExprResult ChainResult = S.UsualUnaryConversions(Chain);
216 if (ChainResult.isInvalid())
218 if (!ChainResult.get()->getType()->isPointerType()) {
219 S.Diag(BuiltinLoc, diag::err_second_argument_to_cwsc_not_pointer)
220 << Chain->getSourceRange();
224 QualType ReturnTy = CE->getCallReturnType(S.Context);
225 QualType ArgTys[2] = { ReturnTy, ChainResult.get()->getType() };
226 QualType BuiltinTy = S.Context.getFunctionType(
227 ReturnTy, ArgTys, FunctionProtoType::ExtProtoInfo());
228 QualType BuiltinPtrTy = S.Context.getPointerType(BuiltinTy);
231 S.ImpCastExprToType(Builtin, BuiltinPtrTy, CK_BuiltinFnToFnPtr).get();
233 BuiltinCall->setType(CE->getType());
234 BuiltinCall->setValueKind(CE->getValueKind());
235 BuiltinCall->setObjectKind(CE->getObjectKind());
236 BuiltinCall->setCallee(Builtin);
237 BuiltinCall->setArg(1, ChainResult.get());
242 static bool SemaBuiltinSEHScopeCheck(Sema &SemaRef, CallExpr *TheCall,
243 Scope::ScopeFlags NeededScopeFlags,
245 // Scopes aren't available during instantiation. Fortunately, builtin
246 // functions cannot be template args so they cannot be formed through template
247 // instantiation. Therefore checking once during the parse is sufficient.
248 if (!SemaRef.ActiveTemplateInstantiations.empty())
251 Scope *S = SemaRef.getCurScope();
252 while (S && !S->isSEHExceptScope())
254 if (!S || !(S->getFlags() & NeededScopeFlags)) {
255 auto *DRE = cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
256 SemaRef.Diag(TheCall->getExprLoc(), DiagID)
257 << DRE->getDecl()->getIdentifier();
264 static inline bool isBlockPointer(Expr *Arg) {
265 return Arg->getType()->isBlockPointerType();
268 /// OpenCL C v2.0, s6.13.17.2 - Checks that the block parameters are all local
269 /// void*, which is a requirement of device side enqueue.
270 static bool checkOpenCLBlockArgs(Sema &S, Expr *BlockArg) {
271 const BlockPointerType *BPT =
272 cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
273 ArrayRef<QualType> Params =
274 BPT->getPointeeType()->getAs<FunctionProtoType>()->getParamTypes();
275 unsigned ArgCounter = 0;
276 bool IllegalParams = false;
277 // Iterate through the block parameters until either one is found that is not
278 // a local void*, or the block is valid.
279 for (ArrayRef<QualType>::iterator I = Params.begin(), E = Params.end();
280 I != E; ++I, ++ArgCounter) {
281 if (!(*I)->isPointerType() || !(*I)->getPointeeType()->isVoidType() ||
282 (*I)->getPointeeType().getQualifiers().getAddressSpace() !=
283 LangAS::opencl_local) {
284 // Get the location of the error. If a block literal has been passed
285 // (BlockExpr) then we can point straight to the offending argument,
286 // else we just point to the variable reference.
287 SourceLocation ErrorLoc;
288 if (isa<BlockExpr>(BlockArg)) {
289 BlockDecl *BD = cast<BlockExpr>(BlockArg)->getBlockDecl();
290 ErrorLoc = BD->getParamDecl(ArgCounter)->getLocStart();
291 } else if (isa<DeclRefExpr>(BlockArg)) {
292 ErrorLoc = cast<DeclRefExpr>(BlockArg)->getLocStart();
295 diag::err_opencl_enqueue_kernel_blocks_non_local_void_args);
296 IllegalParams = true;
300 return IllegalParams;
303 /// OpenCL C v2.0, s6.13.17.6 - Check the argument to the
304 /// get_kernel_work_group_size
305 /// and get_kernel_preferred_work_group_size_multiple builtin functions.
306 static bool SemaOpenCLBuiltinKernelWorkGroupSize(Sema &S, CallExpr *TheCall) {
307 if (checkArgCount(S, TheCall, 1))
310 Expr *BlockArg = TheCall->getArg(0);
311 if (!isBlockPointer(BlockArg)) {
312 S.Diag(BlockArg->getLocStart(),
313 diag::err_opencl_enqueue_kernel_expected_type) << "block";
316 return checkOpenCLBlockArgs(S, BlockArg);
319 static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
320 unsigned Start, unsigned End);
322 /// OpenCL v2.0, s6.13.17.1 - Check that sizes are provided for all
323 /// 'local void*' parameter of passed block.
324 static bool checkOpenCLEnqueueVariadicArgs(Sema &S, CallExpr *TheCall,
326 unsigned NumNonVarArgs) {
327 const BlockPointerType *BPT =
328 cast<BlockPointerType>(BlockArg->getType().getCanonicalType());
329 unsigned NumBlockParams =
330 BPT->getPointeeType()->getAs<FunctionProtoType>()->getNumParams();
331 unsigned TotalNumArgs = TheCall->getNumArgs();
333 // For each argument passed to the block, a corresponding uint needs to
334 // be passed to describe the size of the local memory.
335 if (TotalNumArgs != NumBlockParams + NumNonVarArgs) {
336 S.Diag(TheCall->getLocStart(),
337 diag::err_opencl_enqueue_kernel_local_size_args);
341 // Check that the sizes of the local memory are specified by integers.
342 return checkOpenCLEnqueueLocalSizeArgs(S, TheCall, NumNonVarArgs,
346 /// OpenCL C v2.0, s6.13.17 - Enqueue kernel function contains four different
347 /// overload formats specified in Table 6.13.17.1.
348 /// int enqueue_kernel(queue_t queue,
349 /// kernel_enqueue_flags_t flags,
350 /// const ndrange_t ndrange,
351 /// void (^block)(void))
352 /// int enqueue_kernel(queue_t queue,
353 /// kernel_enqueue_flags_t flags,
354 /// const ndrange_t ndrange,
355 /// uint num_events_in_wait_list,
356 /// clk_event_t *event_wait_list,
357 /// clk_event_t *event_ret,
358 /// void (^block)(void))
359 /// int enqueue_kernel(queue_t queue,
360 /// kernel_enqueue_flags_t flags,
361 /// const ndrange_t ndrange,
362 /// void (^block)(local void*, ...),
364 /// int enqueue_kernel(queue_t queue,
365 /// kernel_enqueue_flags_t flags,
366 /// const ndrange_t ndrange,
367 /// uint num_events_in_wait_list,
368 /// clk_event_t *event_wait_list,
369 /// clk_event_t *event_ret,
370 /// void (^block)(local void*, ...),
372 static bool SemaOpenCLBuiltinEnqueueKernel(Sema &S, CallExpr *TheCall) {
373 unsigned NumArgs = TheCall->getNumArgs();
376 S.Diag(TheCall->getLocStart(), diag::err_typecheck_call_too_few_args);
380 Expr *Arg0 = TheCall->getArg(0);
381 Expr *Arg1 = TheCall->getArg(1);
382 Expr *Arg2 = TheCall->getArg(2);
383 Expr *Arg3 = TheCall->getArg(3);
385 // First argument always needs to be a queue_t type.
386 if (!Arg0->getType()->isQueueT()) {
387 S.Diag(TheCall->getArg(0)->getLocStart(),
388 diag::err_opencl_enqueue_kernel_expected_type)
389 << S.Context.OCLQueueTy;
393 // Second argument always needs to be a kernel_enqueue_flags_t enum value.
394 if (!Arg1->getType()->isIntegerType()) {
395 S.Diag(TheCall->getArg(1)->getLocStart(),
396 diag::err_opencl_enqueue_kernel_expected_type)
397 << "'kernel_enqueue_flags_t' (i.e. uint)";
401 // Third argument is always an ndrange_t type.
402 if (!Arg2->getType()->isNDRangeT()) {
403 S.Diag(TheCall->getArg(2)->getLocStart(),
404 diag::err_opencl_enqueue_kernel_expected_type)
405 << S.Context.OCLNDRangeTy;
409 // With four arguments, there is only one form that the function could be
410 // called in: no events and no variable arguments.
412 // check that the last argument is the right block type.
413 if (!isBlockPointer(Arg3)) {
414 S.Diag(Arg3->getLocStart(), diag::err_opencl_enqueue_kernel_expected_type)
418 // we have a block type, check the prototype
419 const BlockPointerType *BPT =
420 cast<BlockPointerType>(Arg3->getType().getCanonicalType());
421 if (BPT->getPointeeType()->getAs<FunctionProtoType>()->getNumParams() > 0) {
422 S.Diag(Arg3->getLocStart(),
423 diag::err_opencl_enqueue_kernel_blocks_no_args);
428 // we can have block + varargs.
429 if (isBlockPointer(Arg3))
430 return (checkOpenCLBlockArgs(S, Arg3) ||
431 checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg3, 4));
432 // last two cases with either exactly 7 args or 7 args and varargs.
434 // check common block argument.
435 Expr *Arg6 = TheCall->getArg(6);
436 if (!isBlockPointer(Arg6)) {
437 S.Diag(Arg6->getLocStart(), diag::err_opencl_enqueue_kernel_expected_type)
441 if (checkOpenCLBlockArgs(S, Arg6))
444 // Forth argument has to be any integer type.
445 if (!Arg3->getType()->isIntegerType()) {
446 S.Diag(TheCall->getArg(3)->getLocStart(),
447 diag::err_opencl_enqueue_kernel_expected_type)
451 // check remaining common arguments.
452 Expr *Arg4 = TheCall->getArg(4);
453 Expr *Arg5 = TheCall->getArg(5);
455 // Fith argument is always passed as pointers to clk_event_t.
456 if (!Arg4->getType()->getPointeeOrArrayElementType()->isClkEventT()) {
457 S.Diag(TheCall->getArg(4)->getLocStart(),
458 diag::err_opencl_enqueue_kernel_expected_type)
459 << S.Context.getPointerType(S.Context.OCLClkEventTy);
463 // Sixth argument is always passed as pointers to clk_event_t.
464 if (!(Arg5->getType()->isPointerType() &&
465 Arg5->getType()->getPointeeType()->isClkEventT())) {
466 S.Diag(TheCall->getArg(5)->getLocStart(),
467 diag::err_opencl_enqueue_kernel_expected_type)
468 << S.Context.getPointerType(S.Context.OCLClkEventTy);
475 return checkOpenCLEnqueueVariadicArgs(S, TheCall, Arg6, 7);
478 // None of the specific case has been detected, give generic error
479 S.Diag(TheCall->getLocStart(),
480 diag::err_opencl_enqueue_kernel_incorrect_args);
484 /// Returns OpenCL access qual.
485 static OpenCLAccessAttr *getOpenCLArgAccess(const Decl *D) {
486 return D->getAttr<OpenCLAccessAttr>();
489 /// Returns true if pipe element type is different from the pointer.
490 static bool checkOpenCLPipeArg(Sema &S, CallExpr *Call) {
491 const Expr *Arg0 = Call->getArg(0);
492 // First argument type should always be pipe.
493 if (!Arg0->getType()->isPipeType()) {
494 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_first_arg)
495 << Call->getDirectCallee() << Arg0->getSourceRange();
498 OpenCLAccessAttr *AccessQual =
499 getOpenCLArgAccess(cast<DeclRefExpr>(Arg0)->getDecl());
500 // Validates the access qualifier is compatible with the call.
501 // OpenCL v2.0 s6.13.16 - The access qualifiers for pipe should only be
502 // read_only and write_only, and assumed to be read_only if no qualifier is
504 switch (Call->getDirectCallee()->getBuiltinID()) {
505 case Builtin::BIread_pipe:
506 case Builtin::BIreserve_read_pipe:
507 case Builtin::BIcommit_read_pipe:
508 case Builtin::BIwork_group_reserve_read_pipe:
509 case Builtin::BIsub_group_reserve_read_pipe:
510 case Builtin::BIwork_group_commit_read_pipe:
511 case Builtin::BIsub_group_commit_read_pipe:
512 if (!(!AccessQual || AccessQual->isReadOnly())) {
513 S.Diag(Arg0->getLocStart(),
514 diag::err_opencl_builtin_pipe_invalid_access_modifier)
515 << "read_only" << Arg0->getSourceRange();
519 case Builtin::BIwrite_pipe:
520 case Builtin::BIreserve_write_pipe:
521 case Builtin::BIcommit_write_pipe:
522 case Builtin::BIwork_group_reserve_write_pipe:
523 case Builtin::BIsub_group_reserve_write_pipe:
524 case Builtin::BIwork_group_commit_write_pipe:
525 case Builtin::BIsub_group_commit_write_pipe:
526 if (!(AccessQual && AccessQual->isWriteOnly())) {
527 S.Diag(Arg0->getLocStart(),
528 diag::err_opencl_builtin_pipe_invalid_access_modifier)
529 << "write_only" << Arg0->getSourceRange();
539 /// Returns true if pipe element type is different from the pointer.
540 static bool checkOpenCLPipePacketType(Sema &S, CallExpr *Call, unsigned Idx) {
541 const Expr *Arg0 = Call->getArg(0);
542 const Expr *ArgIdx = Call->getArg(Idx);
543 const PipeType *PipeTy = cast<PipeType>(Arg0->getType());
544 const QualType EltTy = PipeTy->getElementType();
545 const PointerType *ArgTy = ArgIdx->getType()->getAs<PointerType>();
546 // The Idx argument should be a pointer and the type of the pointer and
547 // the type of pipe element should also be the same.
549 !S.Context.hasSameType(
550 EltTy, ArgTy->getPointeeType()->getCanonicalTypeInternal())) {
551 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_invalid_arg)
552 << Call->getDirectCallee() << S.Context.getPointerType(EltTy)
553 << ArgIdx->getType() << ArgIdx->getSourceRange();
559 // \brief Performs semantic analysis for the read/write_pipe call.
560 // \param S Reference to the semantic analyzer.
561 // \param Call A pointer to the builtin call.
562 // \return True if a semantic error has been found, false otherwise.
563 static bool SemaBuiltinRWPipe(Sema &S, CallExpr *Call) {
564 // OpenCL v2.0 s6.13.16.2 - The built-in read/write
565 // functions have two forms.
566 switch (Call->getNumArgs()) {
568 if (checkOpenCLPipeArg(S, Call))
570 // The call with 2 arguments should be
571 // read/write_pipe(pipe T, T*).
572 // Check packet type T.
573 if (checkOpenCLPipePacketType(S, Call, 1))
578 if (checkOpenCLPipeArg(S, Call))
580 // The call with 4 arguments should be
581 // read/write_pipe(pipe T, reserve_id_t, uint, T*).
582 // Check reserve_id_t.
583 if (!Call->getArg(1)->getType()->isReserveIDT()) {
584 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_invalid_arg)
585 << Call->getDirectCallee() << S.Context.OCLReserveIDTy
586 << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
591 const Expr *Arg2 = Call->getArg(2);
592 if (!Arg2->getType()->isIntegerType() &&
593 !Arg2->getType()->isUnsignedIntegerType()) {
594 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_invalid_arg)
595 << Call->getDirectCallee() << S.Context.UnsignedIntTy
596 << Arg2->getType() << Arg2->getSourceRange();
600 // Check packet type T.
601 if (checkOpenCLPipePacketType(S, Call, 3))
605 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_arg_num)
606 << Call->getDirectCallee() << Call->getSourceRange();
613 // \brief Performs a semantic analysis on the {work_group_/sub_group_
614 // /_}reserve_{read/write}_pipe
615 // \param S Reference to the semantic analyzer.
616 // \param Call The call to the builtin function to be analyzed.
617 // \return True if a semantic error was found, false otherwise.
618 static bool SemaBuiltinReserveRWPipe(Sema &S, CallExpr *Call) {
619 if (checkArgCount(S, Call, 2))
622 if (checkOpenCLPipeArg(S, Call))
625 // Check the reserve size.
626 if (!Call->getArg(1)->getType()->isIntegerType() &&
627 !Call->getArg(1)->getType()->isUnsignedIntegerType()) {
628 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_invalid_arg)
629 << Call->getDirectCallee() << S.Context.UnsignedIntTy
630 << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
637 // \brief Performs a semantic analysis on {work_group_/sub_group_
638 // /_}commit_{read/write}_pipe
639 // \param S Reference to the semantic analyzer.
640 // \param Call The call to the builtin function to be analyzed.
641 // \return True if a semantic error was found, false otherwise.
642 static bool SemaBuiltinCommitRWPipe(Sema &S, CallExpr *Call) {
643 if (checkArgCount(S, Call, 2))
646 if (checkOpenCLPipeArg(S, Call))
649 // Check reserve_id_t.
650 if (!Call->getArg(1)->getType()->isReserveIDT()) {
651 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_invalid_arg)
652 << Call->getDirectCallee() << S.Context.OCLReserveIDTy
653 << Call->getArg(1)->getType() << Call->getArg(1)->getSourceRange();
660 // \brief Performs a semantic analysis on the call to built-in Pipe
662 // \param S Reference to the semantic analyzer.
663 // \param Call The call to the builtin function to be analyzed.
664 // \return True if a semantic error was found, false otherwise.
665 static bool SemaBuiltinPipePackets(Sema &S, CallExpr *Call) {
666 if (checkArgCount(S, Call, 1))
669 if (!Call->getArg(0)->getType()->isPipeType()) {
670 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_pipe_first_arg)
671 << Call->getDirectCallee() << Call->getArg(0)->getSourceRange();
677 // \brief OpenCL v2.0 s6.13.9 - Address space qualifier functions.
678 // \brief Performs semantic analysis for the to_global/local/private call.
679 // \param S Reference to the semantic analyzer.
680 // \param BuiltinID ID of the builtin function.
681 // \param Call A pointer to the builtin call.
682 // \return True if a semantic error has been found, false otherwise.
683 static bool SemaOpenCLBuiltinToAddr(Sema &S, unsigned BuiltinID,
685 if (Call->getNumArgs() != 1) {
686 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_to_addr_arg_num)
687 << Call->getDirectCallee() << Call->getSourceRange();
691 auto RT = Call->getArg(0)->getType();
692 if (!RT->isPointerType() || RT->getPointeeType()
693 .getAddressSpace() == LangAS::opencl_constant) {
694 S.Diag(Call->getLocStart(), diag::err_opencl_builtin_to_addr_invalid_arg)
695 << Call->getArg(0) << Call->getDirectCallee() << Call->getSourceRange();
699 RT = RT->getPointeeType();
700 auto Qual = RT.getQualifiers();
702 case Builtin::BIto_global:
703 Qual.setAddressSpace(LangAS::opencl_global);
705 case Builtin::BIto_local:
706 Qual.setAddressSpace(LangAS::opencl_local);
709 Qual.removeAddressSpace();
711 Call->setType(S.Context.getPointerType(S.Context.getQualifiedType(
712 RT.getUnqualifiedType(), Qual)));
718 Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
720 ExprResult TheCallResult(TheCall);
722 // Find out if any arguments are required to be integer constant expressions.
723 unsigned ICEArguments = 0;
724 ASTContext::GetBuiltinTypeError Error;
725 Context.GetBuiltinType(BuiltinID, Error, &ICEArguments);
726 if (Error != ASTContext::GE_None)
727 ICEArguments = 0; // Don't diagnose previously diagnosed errors.
729 // If any arguments are required to be ICE's, check and diagnose.
730 for (unsigned ArgNo = 0; ICEArguments != 0; ++ArgNo) {
731 // Skip arguments not required to be ICE's.
732 if ((ICEArguments & (1 << ArgNo)) == 0) continue;
735 if (SemaBuiltinConstantArg(TheCall, ArgNo, Result))
737 ICEArguments &= ~(1 << ArgNo);
741 case Builtin::BI__builtin___CFStringMakeConstantString:
742 assert(TheCall->getNumArgs() == 1 &&
743 "Wrong # arguments to builtin CFStringMakeConstantString");
744 if (CheckObjCString(TheCall->getArg(0)))
747 case Builtin::BI__builtin_stdarg_start:
748 case Builtin::BI__builtin_va_start:
749 if (SemaBuiltinVAStart(TheCall))
752 case Builtin::BI__va_start: {
753 switch (Context.getTargetInfo().getTriple().getArch()) {
754 case llvm::Triple::arm:
755 case llvm::Triple::thumb:
756 if (SemaBuiltinVAStartARM(TheCall))
760 if (SemaBuiltinVAStart(TheCall))
766 case Builtin::BI__builtin_isgreater:
767 case Builtin::BI__builtin_isgreaterequal:
768 case Builtin::BI__builtin_isless:
769 case Builtin::BI__builtin_islessequal:
770 case Builtin::BI__builtin_islessgreater:
771 case Builtin::BI__builtin_isunordered:
772 if (SemaBuiltinUnorderedCompare(TheCall))
775 case Builtin::BI__builtin_fpclassify:
776 if (SemaBuiltinFPClassification(TheCall, 6))
779 case Builtin::BI__builtin_isfinite:
780 case Builtin::BI__builtin_isinf:
781 case Builtin::BI__builtin_isinf_sign:
782 case Builtin::BI__builtin_isnan:
783 case Builtin::BI__builtin_isnormal:
784 if (SemaBuiltinFPClassification(TheCall, 1))
787 case Builtin::BI__builtin_shufflevector:
788 return SemaBuiltinShuffleVector(TheCall);
789 // TheCall will be freed by the smart pointer here, but that's fine, since
790 // SemaBuiltinShuffleVector guts it, but then doesn't release it.
791 case Builtin::BI__builtin_prefetch:
792 if (SemaBuiltinPrefetch(TheCall))
795 case Builtin::BI__assume:
796 case Builtin::BI__builtin_assume:
797 if (SemaBuiltinAssume(TheCall))
800 case Builtin::BI__builtin_assume_aligned:
801 if (SemaBuiltinAssumeAligned(TheCall))
804 case Builtin::BI__builtin_object_size:
805 if (SemaBuiltinConstantArgRange(TheCall, 1, 0, 3))
808 case Builtin::BI__builtin_longjmp:
809 if (SemaBuiltinLongjmp(TheCall))
812 case Builtin::BI__builtin_setjmp:
813 if (SemaBuiltinSetjmp(TheCall))
816 case Builtin::BI_setjmp:
817 case Builtin::BI_setjmpex:
818 if (checkArgCount(*this, TheCall, 1))
822 case Builtin::BI__builtin_classify_type:
823 if (checkArgCount(*this, TheCall, 1)) return true;
824 TheCall->setType(Context.IntTy);
826 case Builtin::BI__builtin_constant_p:
827 if (checkArgCount(*this, TheCall, 1)) return true;
828 TheCall->setType(Context.IntTy);
830 case Builtin::BI__sync_fetch_and_add:
831 case Builtin::BI__sync_fetch_and_add_1:
832 case Builtin::BI__sync_fetch_and_add_2:
833 case Builtin::BI__sync_fetch_and_add_4:
834 case Builtin::BI__sync_fetch_and_add_8:
835 case Builtin::BI__sync_fetch_and_add_16:
836 case Builtin::BI__sync_fetch_and_sub:
837 case Builtin::BI__sync_fetch_and_sub_1:
838 case Builtin::BI__sync_fetch_and_sub_2:
839 case Builtin::BI__sync_fetch_and_sub_4:
840 case Builtin::BI__sync_fetch_and_sub_8:
841 case Builtin::BI__sync_fetch_and_sub_16:
842 case Builtin::BI__sync_fetch_and_or:
843 case Builtin::BI__sync_fetch_and_or_1:
844 case Builtin::BI__sync_fetch_and_or_2:
845 case Builtin::BI__sync_fetch_and_or_4:
846 case Builtin::BI__sync_fetch_and_or_8:
847 case Builtin::BI__sync_fetch_and_or_16:
848 case Builtin::BI__sync_fetch_and_and:
849 case Builtin::BI__sync_fetch_and_and_1:
850 case Builtin::BI__sync_fetch_and_and_2:
851 case Builtin::BI__sync_fetch_and_and_4:
852 case Builtin::BI__sync_fetch_and_and_8:
853 case Builtin::BI__sync_fetch_and_and_16:
854 case Builtin::BI__sync_fetch_and_xor:
855 case Builtin::BI__sync_fetch_and_xor_1:
856 case Builtin::BI__sync_fetch_and_xor_2:
857 case Builtin::BI__sync_fetch_and_xor_4:
858 case Builtin::BI__sync_fetch_and_xor_8:
859 case Builtin::BI__sync_fetch_and_xor_16:
860 case Builtin::BI__sync_fetch_and_nand:
861 case Builtin::BI__sync_fetch_and_nand_1:
862 case Builtin::BI__sync_fetch_and_nand_2:
863 case Builtin::BI__sync_fetch_and_nand_4:
864 case Builtin::BI__sync_fetch_and_nand_8:
865 case Builtin::BI__sync_fetch_and_nand_16:
866 case Builtin::BI__sync_add_and_fetch:
867 case Builtin::BI__sync_add_and_fetch_1:
868 case Builtin::BI__sync_add_and_fetch_2:
869 case Builtin::BI__sync_add_and_fetch_4:
870 case Builtin::BI__sync_add_and_fetch_8:
871 case Builtin::BI__sync_add_and_fetch_16:
872 case Builtin::BI__sync_sub_and_fetch:
873 case Builtin::BI__sync_sub_and_fetch_1:
874 case Builtin::BI__sync_sub_and_fetch_2:
875 case Builtin::BI__sync_sub_and_fetch_4:
876 case Builtin::BI__sync_sub_and_fetch_8:
877 case Builtin::BI__sync_sub_and_fetch_16:
878 case Builtin::BI__sync_and_and_fetch:
879 case Builtin::BI__sync_and_and_fetch_1:
880 case Builtin::BI__sync_and_and_fetch_2:
881 case Builtin::BI__sync_and_and_fetch_4:
882 case Builtin::BI__sync_and_and_fetch_8:
883 case Builtin::BI__sync_and_and_fetch_16:
884 case Builtin::BI__sync_or_and_fetch:
885 case Builtin::BI__sync_or_and_fetch_1:
886 case Builtin::BI__sync_or_and_fetch_2:
887 case Builtin::BI__sync_or_and_fetch_4:
888 case Builtin::BI__sync_or_and_fetch_8:
889 case Builtin::BI__sync_or_and_fetch_16:
890 case Builtin::BI__sync_xor_and_fetch:
891 case Builtin::BI__sync_xor_and_fetch_1:
892 case Builtin::BI__sync_xor_and_fetch_2:
893 case Builtin::BI__sync_xor_and_fetch_4:
894 case Builtin::BI__sync_xor_and_fetch_8:
895 case Builtin::BI__sync_xor_and_fetch_16:
896 case Builtin::BI__sync_nand_and_fetch:
897 case Builtin::BI__sync_nand_and_fetch_1:
898 case Builtin::BI__sync_nand_and_fetch_2:
899 case Builtin::BI__sync_nand_and_fetch_4:
900 case Builtin::BI__sync_nand_and_fetch_8:
901 case Builtin::BI__sync_nand_and_fetch_16:
902 case Builtin::BI__sync_val_compare_and_swap:
903 case Builtin::BI__sync_val_compare_and_swap_1:
904 case Builtin::BI__sync_val_compare_and_swap_2:
905 case Builtin::BI__sync_val_compare_and_swap_4:
906 case Builtin::BI__sync_val_compare_and_swap_8:
907 case Builtin::BI__sync_val_compare_and_swap_16:
908 case Builtin::BI__sync_bool_compare_and_swap:
909 case Builtin::BI__sync_bool_compare_and_swap_1:
910 case Builtin::BI__sync_bool_compare_and_swap_2:
911 case Builtin::BI__sync_bool_compare_and_swap_4:
912 case Builtin::BI__sync_bool_compare_and_swap_8:
913 case Builtin::BI__sync_bool_compare_and_swap_16:
914 case Builtin::BI__sync_lock_test_and_set:
915 case Builtin::BI__sync_lock_test_and_set_1:
916 case Builtin::BI__sync_lock_test_and_set_2:
917 case Builtin::BI__sync_lock_test_and_set_4:
918 case Builtin::BI__sync_lock_test_and_set_8:
919 case Builtin::BI__sync_lock_test_and_set_16:
920 case Builtin::BI__sync_lock_release:
921 case Builtin::BI__sync_lock_release_1:
922 case Builtin::BI__sync_lock_release_2:
923 case Builtin::BI__sync_lock_release_4:
924 case Builtin::BI__sync_lock_release_8:
925 case Builtin::BI__sync_lock_release_16:
926 case Builtin::BI__sync_swap:
927 case Builtin::BI__sync_swap_1:
928 case Builtin::BI__sync_swap_2:
929 case Builtin::BI__sync_swap_4:
930 case Builtin::BI__sync_swap_8:
931 case Builtin::BI__sync_swap_16:
932 return SemaBuiltinAtomicOverloaded(TheCallResult);
933 case Builtin::BI__builtin_nontemporal_load:
934 case Builtin::BI__builtin_nontemporal_store:
935 return SemaBuiltinNontemporalOverloaded(TheCallResult);
936 #define BUILTIN(ID, TYPE, ATTRS)
937 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) \
938 case Builtin::BI##ID: \
939 return SemaAtomicOpsOverloaded(TheCallResult, AtomicExpr::AO##ID);
940 #include "clang/Basic/Builtins.def"
941 case Builtin::BI__builtin_annotation:
942 if (SemaBuiltinAnnotation(*this, TheCall))
945 case Builtin::BI__builtin_addressof:
946 if (SemaBuiltinAddressof(*this, TheCall))
949 case Builtin::BI__builtin_add_overflow:
950 case Builtin::BI__builtin_sub_overflow:
951 case Builtin::BI__builtin_mul_overflow:
952 if (SemaBuiltinOverflow(*this, TheCall))
955 case Builtin::BI__builtin_operator_new:
956 case Builtin::BI__builtin_operator_delete:
957 if (!getLangOpts().CPlusPlus) {
958 Diag(TheCall->getExprLoc(), diag::err_builtin_requires_language)
959 << (BuiltinID == Builtin::BI__builtin_operator_new
960 ? "__builtin_operator_new"
961 : "__builtin_operator_delete")
965 // CodeGen assumes it can find the global new and delete to call,
966 // so ensure that they are declared.
967 DeclareGlobalNewDelete();
970 // check secure string manipulation functions where overflows
971 // are detectable at compile time
972 case Builtin::BI__builtin___memcpy_chk:
973 case Builtin::BI__builtin___memmove_chk:
974 case Builtin::BI__builtin___memset_chk:
975 case Builtin::BI__builtin___strlcat_chk:
976 case Builtin::BI__builtin___strlcpy_chk:
977 case Builtin::BI__builtin___strncat_chk:
978 case Builtin::BI__builtin___strncpy_chk:
979 case Builtin::BI__builtin___stpncpy_chk:
980 SemaBuiltinMemChkCall(*this, FDecl, TheCall, 2, 3);
982 case Builtin::BI__builtin___memccpy_chk:
983 SemaBuiltinMemChkCall(*this, FDecl, TheCall, 3, 4);
985 case Builtin::BI__builtin___snprintf_chk:
986 case Builtin::BI__builtin___vsnprintf_chk:
987 SemaBuiltinMemChkCall(*this, FDecl, TheCall, 1, 3);
989 case Builtin::BI__builtin_call_with_static_chain:
990 if (SemaBuiltinCallWithStaticChain(*this, TheCall))
993 case Builtin::BI__exception_code:
994 case Builtin::BI_exception_code:
995 if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHExceptScope,
996 diag::err_seh___except_block))
999 case Builtin::BI__exception_info:
1000 case Builtin::BI_exception_info:
1001 if (SemaBuiltinSEHScopeCheck(*this, TheCall, Scope::SEHFilterScope,
1002 diag::err_seh___except_filter))
1005 case Builtin::BI__GetExceptionInfo:
1006 if (checkArgCount(*this, TheCall, 1))
1009 if (CheckCXXThrowOperand(
1010 TheCall->getLocStart(),
1011 Context.getExceptionObjectType(FDecl->getParamDecl(0)->getType()),
1015 TheCall->setType(Context.VoidPtrTy);
1017 // OpenCL v2.0, s6.13.16 - Pipe functions
1018 case Builtin::BIread_pipe:
1019 case Builtin::BIwrite_pipe:
1020 // Since those two functions are declared with var args, we need a semantic
1021 // check for the argument.
1022 if (SemaBuiltinRWPipe(*this, TheCall))
1025 case Builtin::BIreserve_read_pipe:
1026 case Builtin::BIreserve_write_pipe:
1027 case Builtin::BIwork_group_reserve_read_pipe:
1028 case Builtin::BIwork_group_reserve_write_pipe:
1029 case Builtin::BIsub_group_reserve_read_pipe:
1030 case Builtin::BIsub_group_reserve_write_pipe:
1031 if (SemaBuiltinReserveRWPipe(*this, TheCall))
1033 // Since return type of reserve_read/write_pipe built-in function is
1034 // reserve_id_t, which is not defined in the builtin def file , we used int
1035 // as return type and need to override the return type of these functions.
1036 TheCall->setType(Context.OCLReserveIDTy);
1038 case Builtin::BIcommit_read_pipe:
1039 case Builtin::BIcommit_write_pipe:
1040 case Builtin::BIwork_group_commit_read_pipe:
1041 case Builtin::BIwork_group_commit_write_pipe:
1042 case Builtin::BIsub_group_commit_read_pipe:
1043 case Builtin::BIsub_group_commit_write_pipe:
1044 if (SemaBuiltinCommitRWPipe(*this, TheCall))
1047 case Builtin::BIget_pipe_num_packets:
1048 case Builtin::BIget_pipe_max_packets:
1049 if (SemaBuiltinPipePackets(*this, TheCall))
1052 case Builtin::BIto_global:
1053 case Builtin::BIto_local:
1054 case Builtin::BIto_private:
1055 if (SemaOpenCLBuiltinToAddr(*this, BuiltinID, TheCall))
1058 // OpenCL v2.0, s6.13.17 - Enqueue kernel functions.
1059 case Builtin::BIenqueue_kernel:
1060 if (SemaOpenCLBuiltinEnqueueKernel(*this, TheCall))
1063 case Builtin::BIget_kernel_work_group_size:
1064 case Builtin::BIget_kernel_preferred_work_group_size_multiple:
1065 if (SemaOpenCLBuiltinKernelWorkGroupSize(*this, TheCall))
1069 // Since the target specific builtins for each arch overlap, only check those
1070 // of the arch we are compiling for.
1071 if (Context.BuiltinInfo.isTSBuiltin(BuiltinID)) {
1072 switch (Context.getTargetInfo().getTriple().getArch()) {
1073 case llvm::Triple::arm:
1074 case llvm::Triple::armeb:
1075 case llvm::Triple::thumb:
1076 case llvm::Triple::thumbeb:
1077 if (CheckARMBuiltinFunctionCall(BuiltinID, TheCall))
1080 case llvm::Triple::aarch64:
1081 case llvm::Triple::aarch64_be:
1082 if (CheckAArch64BuiltinFunctionCall(BuiltinID, TheCall))
1085 case llvm::Triple::mips:
1086 case llvm::Triple::mipsel:
1087 case llvm::Triple::mips64:
1088 case llvm::Triple::mips64el:
1089 if (CheckMipsBuiltinFunctionCall(BuiltinID, TheCall))
1092 case llvm::Triple::systemz:
1093 if (CheckSystemZBuiltinFunctionCall(BuiltinID, TheCall))
1096 case llvm::Triple::x86:
1097 case llvm::Triple::x86_64:
1098 if (CheckX86BuiltinFunctionCall(BuiltinID, TheCall))
1101 case llvm::Triple::ppc:
1102 case llvm::Triple::ppc64:
1103 case llvm::Triple::ppc64le:
1104 if (CheckPPCBuiltinFunctionCall(BuiltinID, TheCall))
1112 return TheCallResult;
1115 // Get the valid immediate range for the specified NEON type code.
1116 static unsigned RFT(unsigned t, bool shift = false, bool ForceQuad = false) {
1117 NeonTypeFlags Type(t);
1118 int IsQuad = ForceQuad ? true : Type.isQuad();
1119 switch (Type.getEltType()) {
1120 case NeonTypeFlags::Int8:
1121 case NeonTypeFlags::Poly8:
1122 return shift ? 7 : (8 << IsQuad) - 1;
1123 case NeonTypeFlags::Int16:
1124 case NeonTypeFlags::Poly16:
1125 return shift ? 15 : (4 << IsQuad) - 1;
1126 case NeonTypeFlags::Int32:
1127 return shift ? 31 : (2 << IsQuad) - 1;
1128 case NeonTypeFlags::Int64:
1129 case NeonTypeFlags::Poly64:
1130 return shift ? 63 : (1 << IsQuad) - 1;
1131 case NeonTypeFlags::Poly128:
1132 return shift ? 127 : (1 << IsQuad) - 1;
1133 case NeonTypeFlags::Float16:
1134 assert(!shift && "cannot shift float types!");
1135 return (4 << IsQuad) - 1;
1136 case NeonTypeFlags::Float32:
1137 assert(!shift && "cannot shift float types!");
1138 return (2 << IsQuad) - 1;
1139 case NeonTypeFlags::Float64:
1140 assert(!shift && "cannot shift float types!");
1141 return (1 << IsQuad) - 1;
1143 llvm_unreachable("Invalid NeonTypeFlag!");
1146 /// getNeonEltType - Return the QualType corresponding to the elements of
1147 /// the vector type specified by the NeonTypeFlags. This is used to check
1148 /// the pointer arguments for Neon load/store intrinsics.
1149 static QualType getNeonEltType(NeonTypeFlags Flags, ASTContext &Context,
1150 bool IsPolyUnsigned, bool IsInt64Long) {
1151 switch (Flags.getEltType()) {
1152 case NeonTypeFlags::Int8:
1153 return Flags.isUnsigned() ? Context.UnsignedCharTy : Context.SignedCharTy;
1154 case NeonTypeFlags::Int16:
1155 return Flags.isUnsigned() ? Context.UnsignedShortTy : Context.ShortTy;
1156 case NeonTypeFlags::Int32:
1157 return Flags.isUnsigned() ? Context.UnsignedIntTy : Context.IntTy;
1158 case NeonTypeFlags::Int64:
1160 return Flags.isUnsigned() ? Context.UnsignedLongTy : Context.LongTy;
1162 return Flags.isUnsigned() ? Context.UnsignedLongLongTy
1163 : Context.LongLongTy;
1164 case NeonTypeFlags::Poly8:
1165 return IsPolyUnsigned ? Context.UnsignedCharTy : Context.SignedCharTy;
1166 case NeonTypeFlags::Poly16:
1167 return IsPolyUnsigned ? Context.UnsignedShortTy : Context.ShortTy;
1168 case NeonTypeFlags::Poly64:
1170 return Context.UnsignedLongTy;
1172 return Context.UnsignedLongLongTy;
1173 case NeonTypeFlags::Poly128:
1175 case NeonTypeFlags::Float16:
1176 return Context.HalfTy;
1177 case NeonTypeFlags::Float32:
1178 return Context.FloatTy;
1179 case NeonTypeFlags::Float64:
1180 return Context.DoubleTy;
1182 llvm_unreachable("Invalid NeonTypeFlag!");
1185 bool Sema::CheckNeonBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1186 llvm::APSInt Result;
1190 bool HasConstPtr = false;
1191 switch (BuiltinID) {
1192 #define GET_NEON_OVERLOAD_CHECK
1193 #include "clang/Basic/arm_neon.inc"
1194 #undef GET_NEON_OVERLOAD_CHECK
1197 // For NEON intrinsics which are overloaded on vector element type, validate
1198 // the immediate which specifies which variant to emit.
1199 unsigned ImmArg = TheCall->getNumArgs()-1;
1201 if (SemaBuiltinConstantArg(TheCall, ImmArg, Result))
1204 TV = Result.getLimitedValue(64);
1205 if ((TV > 63) || (mask & (1ULL << TV)) == 0)
1206 return Diag(TheCall->getLocStart(), diag::err_invalid_neon_type_code)
1207 << TheCall->getArg(ImmArg)->getSourceRange();
1210 if (PtrArgNum >= 0) {
1211 // Check that pointer arguments have the specified type.
1212 Expr *Arg = TheCall->getArg(PtrArgNum);
1213 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg))
1214 Arg = ICE->getSubExpr();
1215 ExprResult RHS = DefaultFunctionArrayLvalueConversion(Arg);
1216 QualType RHSTy = RHS.get()->getType();
1218 llvm::Triple::ArchType Arch = Context.getTargetInfo().getTriple().getArch();
1219 bool IsPolyUnsigned = Arch == llvm::Triple::aarch64;
1221 Context.getTargetInfo().getInt64Type() == TargetInfo::SignedLong;
1223 getNeonEltType(NeonTypeFlags(TV), Context, IsPolyUnsigned, IsInt64Long);
1225 EltTy = EltTy.withConst();
1226 QualType LHSTy = Context.getPointerType(EltTy);
1227 AssignConvertType ConvTy;
1228 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
1229 if (RHS.isInvalid())
1231 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), LHSTy, RHSTy,
1232 RHS.get(), AA_Assigning))
1236 // For NEON intrinsics which take an immediate value as part of the
1237 // instruction, range check them here.
1238 unsigned i = 0, l = 0, u = 0;
1239 switch (BuiltinID) {
1242 #define GET_NEON_IMMEDIATE_CHECK
1243 #include "clang/Basic/arm_neon.inc"
1244 #undef GET_NEON_IMMEDIATE_CHECK
1247 return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
1250 bool Sema::CheckARMBuiltinExclusiveCall(unsigned BuiltinID, CallExpr *TheCall,
1251 unsigned MaxWidth) {
1252 assert((BuiltinID == ARM::BI__builtin_arm_ldrex ||
1253 BuiltinID == ARM::BI__builtin_arm_ldaex ||
1254 BuiltinID == ARM::BI__builtin_arm_strex ||
1255 BuiltinID == ARM::BI__builtin_arm_stlex ||
1256 BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1257 BuiltinID == AArch64::BI__builtin_arm_ldaex ||
1258 BuiltinID == AArch64::BI__builtin_arm_strex ||
1259 BuiltinID == AArch64::BI__builtin_arm_stlex) &&
1260 "unexpected ARM builtin");
1261 bool IsLdrex = BuiltinID == ARM::BI__builtin_arm_ldrex ||
1262 BuiltinID == ARM::BI__builtin_arm_ldaex ||
1263 BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1264 BuiltinID == AArch64::BI__builtin_arm_ldaex;
1266 DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
1268 // Ensure that we have the proper number of arguments.
1269 if (checkArgCount(*this, TheCall, IsLdrex ? 1 : 2))
1272 // Inspect the pointer argument of the atomic builtin. This should always be
1273 // a pointer type, whose element is an integral scalar or pointer type.
1274 // Because it is a pointer type, we don't have to worry about any implicit
1276 Expr *PointerArg = TheCall->getArg(IsLdrex ? 0 : 1);
1277 ExprResult PointerArgRes = DefaultFunctionArrayLvalueConversion(PointerArg);
1278 if (PointerArgRes.isInvalid())
1280 PointerArg = PointerArgRes.get();
1282 const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
1284 Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer)
1285 << PointerArg->getType() << PointerArg->getSourceRange();
1289 // ldrex takes a "const volatile T*" and strex takes a "volatile T*". Our next
1290 // task is to insert the appropriate casts into the AST. First work out just
1291 // what the appropriate type is.
1292 QualType ValType = pointerType->getPointeeType();
1293 QualType AddrType = ValType.getUnqualifiedType().withVolatile();
1295 AddrType.addConst();
1297 // Issue a warning if the cast is dodgy.
1298 CastKind CastNeeded = CK_NoOp;
1299 if (!AddrType.isAtLeastAsQualifiedAs(ValType)) {
1300 CastNeeded = CK_BitCast;
1301 Diag(DRE->getLocStart(), diag::ext_typecheck_convert_discards_qualifiers)
1302 << PointerArg->getType()
1303 << Context.getPointerType(AddrType)
1304 << AA_Passing << PointerArg->getSourceRange();
1307 // Finally, do the cast and replace the argument with the corrected version.
1308 AddrType = Context.getPointerType(AddrType);
1309 PointerArgRes = ImpCastExprToType(PointerArg, AddrType, CastNeeded);
1310 if (PointerArgRes.isInvalid())
1312 PointerArg = PointerArgRes.get();
1314 TheCall->setArg(IsLdrex ? 0 : 1, PointerArg);
1316 // In general, we allow ints, floats and pointers to be loaded and stored.
1317 if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
1318 !ValType->isBlockPointerType() && !ValType->isFloatingType()) {
1319 Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer_intfltptr)
1320 << PointerArg->getType() << PointerArg->getSourceRange();
1324 // But ARM doesn't have instructions to deal with 128-bit versions.
1325 if (Context.getTypeSize(ValType) > MaxWidth) {
1326 assert(MaxWidth == 64 && "Diagnostic unexpectedly inaccurate");
1327 Diag(DRE->getLocStart(), diag::err_atomic_exclusive_builtin_pointer_size)
1328 << PointerArg->getType() << PointerArg->getSourceRange();
1332 switch (ValType.getObjCLifetime()) {
1333 case Qualifiers::OCL_None:
1334 case Qualifiers::OCL_ExplicitNone:
1338 case Qualifiers::OCL_Weak:
1339 case Qualifiers::OCL_Strong:
1340 case Qualifiers::OCL_Autoreleasing:
1341 Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership)
1342 << ValType << PointerArg->getSourceRange();
1347 TheCall->setType(ValType);
1351 // Initialize the argument to be stored.
1352 ExprResult ValArg = TheCall->getArg(0);
1353 InitializedEntity Entity = InitializedEntity::InitializeParameter(
1354 Context, ValType, /*consume*/ false);
1355 ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
1356 if (ValArg.isInvalid())
1358 TheCall->setArg(0, ValArg.get());
1360 // __builtin_arm_strex always returns an int. It's marked as such in the .def,
1361 // but the custom checker bypasses all default analysis.
1362 TheCall->setType(Context.IntTy);
1366 bool Sema::CheckARMBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1367 llvm::APSInt Result;
1369 if (BuiltinID == ARM::BI__builtin_arm_ldrex ||
1370 BuiltinID == ARM::BI__builtin_arm_ldaex ||
1371 BuiltinID == ARM::BI__builtin_arm_strex ||
1372 BuiltinID == ARM::BI__builtin_arm_stlex) {
1373 return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 64);
1376 if (BuiltinID == ARM::BI__builtin_arm_prefetch) {
1377 return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
1378 SemaBuiltinConstantArgRange(TheCall, 2, 0, 1);
1381 if (BuiltinID == ARM::BI__builtin_arm_rsr64 ||
1382 BuiltinID == ARM::BI__builtin_arm_wsr64)
1383 return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 3, false);
1385 if (BuiltinID == ARM::BI__builtin_arm_rsr ||
1386 BuiltinID == ARM::BI__builtin_arm_rsrp ||
1387 BuiltinID == ARM::BI__builtin_arm_wsr ||
1388 BuiltinID == ARM::BI__builtin_arm_wsrp)
1389 return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1391 if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
1394 // For intrinsics which take an immediate value as part of the instruction,
1395 // range check them here.
1396 unsigned i = 0, l = 0, u = 0;
1397 switch (BuiltinID) {
1398 default: return false;
1399 case ARM::BI__builtin_arm_ssat: i = 1; l = 1; u = 31; break;
1400 case ARM::BI__builtin_arm_usat: i = 1; u = 31; break;
1401 case ARM::BI__builtin_arm_vcvtr_f:
1402 case ARM::BI__builtin_arm_vcvtr_d: i = 1; u = 1; break;
1403 case ARM::BI__builtin_arm_dmb:
1404 case ARM::BI__builtin_arm_dsb:
1405 case ARM::BI__builtin_arm_isb:
1406 case ARM::BI__builtin_arm_dbg: l = 0; u = 15; break;
1409 // FIXME: VFP Intrinsics should error if VFP not present.
1410 return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
1413 bool Sema::CheckAArch64BuiltinFunctionCall(unsigned BuiltinID,
1414 CallExpr *TheCall) {
1415 llvm::APSInt Result;
1417 if (BuiltinID == AArch64::BI__builtin_arm_ldrex ||
1418 BuiltinID == AArch64::BI__builtin_arm_ldaex ||
1419 BuiltinID == AArch64::BI__builtin_arm_strex ||
1420 BuiltinID == AArch64::BI__builtin_arm_stlex) {
1421 return CheckARMBuiltinExclusiveCall(BuiltinID, TheCall, 128);
1424 if (BuiltinID == AArch64::BI__builtin_arm_prefetch) {
1425 return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
1426 SemaBuiltinConstantArgRange(TheCall, 2, 0, 2) ||
1427 SemaBuiltinConstantArgRange(TheCall, 3, 0, 1) ||
1428 SemaBuiltinConstantArgRange(TheCall, 4, 0, 1);
1431 if (BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
1432 BuiltinID == AArch64::BI__builtin_arm_wsr64)
1433 return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1435 if (BuiltinID == AArch64::BI__builtin_arm_rsr ||
1436 BuiltinID == AArch64::BI__builtin_arm_rsrp ||
1437 BuiltinID == AArch64::BI__builtin_arm_wsr ||
1438 BuiltinID == AArch64::BI__builtin_arm_wsrp)
1439 return SemaBuiltinARMSpecialReg(BuiltinID, TheCall, 0, 5, true);
1441 if (CheckNeonBuiltinFunctionCall(BuiltinID, TheCall))
1444 // For intrinsics which take an immediate value as part of the instruction,
1445 // range check them here.
1446 unsigned i = 0, l = 0, u = 0;
1447 switch (BuiltinID) {
1448 default: return false;
1449 case AArch64::BI__builtin_arm_dmb:
1450 case AArch64::BI__builtin_arm_dsb:
1451 case AArch64::BI__builtin_arm_isb: l = 0; u = 15; break;
1454 return SemaBuiltinConstantArgRange(TheCall, i, l, u + l);
1457 // CheckMipsBuiltinFunctionCall - Checks the constant value passed to the
1458 // intrinsic is correct. The switch statement is ordered by DSP, MSA. The
1459 // ordering for DSP is unspecified. MSA is ordered by the data format used
1460 // by the underlying instruction i.e., df/m, df/n and then by size.
1462 // FIXME: The size tests here should instead be tablegen'd along with the
1463 // definitions from include/clang/Basic/BuiltinsMips.def.
1464 // FIXME: GCC is strict on signedness for some of these intrinsics, we should
1466 bool Sema::CheckMipsBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1467 unsigned i = 0, l = 0, u = 0, m = 0;
1468 switch (BuiltinID) {
1469 default: return false;
1470 case Mips::BI__builtin_mips_wrdsp: i = 1; l = 0; u = 63; break;
1471 case Mips::BI__builtin_mips_rddsp: i = 0; l = 0; u = 63; break;
1472 case Mips::BI__builtin_mips_append: i = 2; l = 0; u = 31; break;
1473 case Mips::BI__builtin_mips_balign: i = 2; l = 0; u = 3; break;
1474 case Mips::BI__builtin_mips_precr_sra_ph_w: i = 2; l = 0; u = 31; break;
1475 case Mips::BI__builtin_mips_precr_sra_r_ph_w: i = 2; l = 0; u = 31; break;
1476 case Mips::BI__builtin_mips_prepend: i = 2; l = 0; u = 31; break;
1477 // MSA instrinsics. Instructions (which the intrinsics maps to) which use the
1479 // These intrinsics take an unsigned 3 bit immediate.
1480 case Mips::BI__builtin_msa_bclri_b:
1481 case Mips::BI__builtin_msa_bnegi_b:
1482 case Mips::BI__builtin_msa_bseti_b:
1483 case Mips::BI__builtin_msa_sat_s_b:
1484 case Mips::BI__builtin_msa_sat_u_b:
1485 case Mips::BI__builtin_msa_slli_b:
1486 case Mips::BI__builtin_msa_srai_b:
1487 case Mips::BI__builtin_msa_srari_b:
1488 case Mips::BI__builtin_msa_srli_b:
1489 case Mips::BI__builtin_msa_srlri_b: i = 1; l = 0; u = 7; break;
1490 case Mips::BI__builtin_msa_binsli_b:
1491 case Mips::BI__builtin_msa_binsri_b: i = 2; l = 0; u = 7; break;
1492 // These intrinsics take an unsigned 4 bit immediate.
1493 case Mips::BI__builtin_msa_bclri_h:
1494 case Mips::BI__builtin_msa_bnegi_h:
1495 case Mips::BI__builtin_msa_bseti_h:
1496 case Mips::BI__builtin_msa_sat_s_h:
1497 case Mips::BI__builtin_msa_sat_u_h:
1498 case Mips::BI__builtin_msa_slli_h:
1499 case Mips::BI__builtin_msa_srai_h:
1500 case Mips::BI__builtin_msa_srari_h:
1501 case Mips::BI__builtin_msa_srli_h:
1502 case Mips::BI__builtin_msa_srlri_h: i = 1; l = 0; u = 15; break;
1503 case Mips::BI__builtin_msa_binsli_h:
1504 case Mips::BI__builtin_msa_binsri_h: i = 2; l = 0; u = 15; break;
1505 // These intrinsics take an unsigned 5 bit immedate.
1506 // The first block of intrinsics actually have an unsigned 5 bit field,
1507 // not a df/n field.
1508 case Mips::BI__builtin_msa_clei_u_b:
1509 case Mips::BI__builtin_msa_clei_u_h:
1510 case Mips::BI__builtin_msa_clei_u_w:
1511 case Mips::BI__builtin_msa_clei_u_d:
1512 case Mips::BI__builtin_msa_clti_u_b:
1513 case Mips::BI__builtin_msa_clti_u_h:
1514 case Mips::BI__builtin_msa_clti_u_w:
1515 case Mips::BI__builtin_msa_clti_u_d:
1516 case Mips::BI__builtin_msa_maxi_u_b:
1517 case Mips::BI__builtin_msa_maxi_u_h:
1518 case Mips::BI__builtin_msa_maxi_u_w:
1519 case Mips::BI__builtin_msa_maxi_u_d:
1520 case Mips::BI__builtin_msa_mini_u_b:
1521 case Mips::BI__builtin_msa_mini_u_h:
1522 case Mips::BI__builtin_msa_mini_u_w:
1523 case Mips::BI__builtin_msa_mini_u_d:
1524 case Mips::BI__builtin_msa_addvi_b:
1525 case Mips::BI__builtin_msa_addvi_h:
1526 case Mips::BI__builtin_msa_addvi_w:
1527 case Mips::BI__builtin_msa_addvi_d:
1528 case Mips::BI__builtin_msa_bclri_w:
1529 case Mips::BI__builtin_msa_bnegi_w:
1530 case Mips::BI__builtin_msa_bseti_w:
1531 case Mips::BI__builtin_msa_sat_s_w:
1532 case Mips::BI__builtin_msa_sat_u_w:
1533 case Mips::BI__builtin_msa_slli_w:
1534 case Mips::BI__builtin_msa_srai_w:
1535 case Mips::BI__builtin_msa_srari_w:
1536 case Mips::BI__builtin_msa_srli_w:
1537 case Mips::BI__builtin_msa_srlri_w:
1538 case Mips::BI__builtin_msa_subvi_b:
1539 case Mips::BI__builtin_msa_subvi_h:
1540 case Mips::BI__builtin_msa_subvi_w:
1541 case Mips::BI__builtin_msa_subvi_d: i = 1; l = 0; u = 31; break;
1542 case Mips::BI__builtin_msa_binsli_w:
1543 case Mips::BI__builtin_msa_binsri_w: i = 2; l = 0; u = 31; break;
1544 // These intrinsics take an unsigned 6 bit immediate.
1545 case Mips::BI__builtin_msa_bclri_d:
1546 case Mips::BI__builtin_msa_bnegi_d:
1547 case Mips::BI__builtin_msa_bseti_d:
1548 case Mips::BI__builtin_msa_sat_s_d:
1549 case Mips::BI__builtin_msa_sat_u_d:
1550 case Mips::BI__builtin_msa_slli_d:
1551 case Mips::BI__builtin_msa_srai_d:
1552 case Mips::BI__builtin_msa_srari_d:
1553 case Mips::BI__builtin_msa_srli_d:
1554 case Mips::BI__builtin_msa_srlri_d: i = 1; l = 0; u = 63; break;
1555 case Mips::BI__builtin_msa_binsli_d:
1556 case Mips::BI__builtin_msa_binsri_d: i = 2; l = 0; u = 63; break;
1557 // These intrinsics take a signed 5 bit immediate.
1558 case Mips::BI__builtin_msa_ceqi_b:
1559 case Mips::BI__builtin_msa_ceqi_h:
1560 case Mips::BI__builtin_msa_ceqi_w:
1561 case Mips::BI__builtin_msa_ceqi_d:
1562 case Mips::BI__builtin_msa_clti_s_b:
1563 case Mips::BI__builtin_msa_clti_s_h:
1564 case Mips::BI__builtin_msa_clti_s_w:
1565 case Mips::BI__builtin_msa_clti_s_d:
1566 case Mips::BI__builtin_msa_clei_s_b:
1567 case Mips::BI__builtin_msa_clei_s_h:
1568 case Mips::BI__builtin_msa_clei_s_w:
1569 case Mips::BI__builtin_msa_clei_s_d:
1570 case Mips::BI__builtin_msa_maxi_s_b:
1571 case Mips::BI__builtin_msa_maxi_s_h:
1572 case Mips::BI__builtin_msa_maxi_s_w:
1573 case Mips::BI__builtin_msa_maxi_s_d:
1574 case Mips::BI__builtin_msa_mini_s_b:
1575 case Mips::BI__builtin_msa_mini_s_h:
1576 case Mips::BI__builtin_msa_mini_s_w:
1577 case Mips::BI__builtin_msa_mini_s_d: i = 1; l = -16; u = 15; break;
1578 // These intrinsics take an unsigned 8 bit immediate.
1579 case Mips::BI__builtin_msa_andi_b:
1580 case Mips::BI__builtin_msa_nori_b:
1581 case Mips::BI__builtin_msa_ori_b:
1582 case Mips::BI__builtin_msa_shf_b:
1583 case Mips::BI__builtin_msa_shf_h:
1584 case Mips::BI__builtin_msa_shf_w:
1585 case Mips::BI__builtin_msa_xori_b: i = 1; l = 0; u = 255; break;
1586 case Mips::BI__builtin_msa_bseli_b:
1587 case Mips::BI__builtin_msa_bmnzi_b:
1588 case Mips::BI__builtin_msa_bmzi_b: i = 2; l = 0; u = 255; break;
1590 // These intrinsics take an unsigned 4 bit immediate.
1591 case Mips::BI__builtin_msa_copy_s_b:
1592 case Mips::BI__builtin_msa_copy_u_b:
1593 case Mips::BI__builtin_msa_insve_b:
1594 case Mips::BI__builtin_msa_splati_b: i = 1; l = 0; u = 15; break;
1595 case Mips::BI__builtin_msa_sld_b:
1596 case Mips::BI__builtin_msa_sldi_b: i = 2; l = 0; u = 15; break;
1597 // These intrinsics take an unsigned 3 bit immediate.
1598 case Mips::BI__builtin_msa_copy_s_h:
1599 case Mips::BI__builtin_msa_copy_u_h:
1600 case Mips::BI__builtin_msa_insve_h:
1601 case Mips::BI__builtin_msa_splati_h: i = 1; l = 0; u = 7; break;
1602 case Mips::BI__builtin_msa_sld_h:
1603 case Mips::BI__builtin_msa_sldi_h: i = 2; l = 0; u = 7; break;
1604 // These intrinsics take an unsigned 2 bit immediate.
1605 case Mips::BI__builtin_msa_copy_s_w:
1606 case Mips::BI__builtin_msa_copy_u_w:
1607 case Mips::BI__builtin_msa_insve_w:
1608 case Mips::BI__builtin_msa_splati_w: i = 1; l = 0; u = 3; break;
1609 case Mips::BI__builtin_msa_sld_w:
1610 case Mips::BI__builtin_msa_sldi_w: i = 2; l = 0; u = 3; break;
1611 // These intrinsics take an unsigned 1 bit immediate.
1612 case Mips::BI__builtin_msa_copy_s_d:
1613 case Mips::BI__builtin_msa_copy_u_d:
1614 case Mips::BI__builtin_msa_insve_d:
1615 case Mips::BI__builtin_msa_splati_d: i = 1; l = 0; u = 1; break;
1616 case Mips::BI__builtin_msa_sld_d:
1617 case Mips::BI__builtin_msa_sldi_d: i = 2; l = 0; u = 1; break;
1618 // Memory offsets and immediate loads.
1619 // These intrinsics take a signed 10 bit immediate.
1620 case Mips::BI__builtin_msa_ldi_b: i = 0; l = -128; u = 127; break;
1621 case Mips::BI__builtin_msa_ldi_h:
1622 case Mips::BI__builtin_msa_ldi_w:
1623 case Mips::BI__builtin_msa_ldi_d: i = 0; l = -512; u = 511; break;
1624 case Mips::BI__builtin_msa_ld_b: i = 1; l = -512; u = 511; m = 16; break;
1625 case Mips::BI__builtin_msa_ld_h: i = 1; l = -1024; u = 1022; m = 16; break;
1626 case Mips::BI__builtin_msa_ld_w: i = 1; l = -2048; u = 2044; m = 16; break;
1627 case Mips::BI__builtin_msa_ld_d: i = 1; l = -4096; u = 4088; m = 16; break;
1628 case Mips::BI__builtin_msa_st_b: i = 2; l = -512; u = 511; m = 16; break;
1629 case Mips::BI__builtin_msa_st_h: i = 2; l = -1024; u = 1022; m = 16; break;
1630 case Mips::BI__builtin_msa_st_w: i = 2; l = -2048; u = 2044; m = 16; break;
1631 case Mips::BI__builtin_msa_st_d: i = 2; l = -4096; u = 4088; m = 16; break;
1635 return SemaBuiltinConstantArgRange(TheCall, i, l, u);
1637 return SemaBuiltinConstantArgRange(TheCall, i, l, u) ||
1638 SemaBuiltinConstantArgMultiple(TheCall, i, m);
1641 bool Sema::CheckPPCBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1642 unsigned i = 0, l = 0, u = 0;
1643 bool Is64BitBltin = BuiltinID == PPC::BI__builtin_divde ||
1644 BuiltinID == PPC::BI__builtin_divdeu ||
1645 BuiltinID == PPC::BI__builtin_bpermd;
1646 bool IsTarget64Bit = Context.getTargetInfo()
1647 .getTypeWidth(Context
1649 .getIntPtrType()) == 64;
1650 bool IsBltinExtDiv = BuiltinID == PPC::BI__builtin_divwe ||
1651 BuiltinID == PPC::BI__builtin_divweu ||
1652 BuiltinID == PPC::BI__builtin_divde ||
1653 BuiltinID == PPC::BI__builtin_divdeu;
1655 if (Is64BitBltin && !IsTarget64Bit)
1656 return Diag(TheCall->getLocStart(), diag::err_64_bit_builtin_32_bit_tgt)
1657 << TheCall->getSourceRange();
1659 if ((IsBltinExtDiv && !Context.getTargetInfo().hasFeature("extdiv")) ||
1660 (BuiltinID == PPC::BI__builtin_bpermd &&
1661 !Context.getTargetInfo().hasFeature("bpermd")))
1662 return Diag(TheCall->getLocStart(), diag::err_ppc_builtin_only_on_pwr7)
1663 << TheCall->getSourceRange();
1665 switch (BuiltinID) {
1666 default: return false;
1667 case PPC::BI__builtin_altivec_crypto_vshasigmaw:
1668 case PPC::BI__builtin_altivec_crypto_vshasigmad:
1669 return SemaBuiltinConstantArgRange(TheCall, 1, 0, 1) ||
1670 SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
1671 case PPC::BI__builtin_tbegin:
1672 case PPC::BI__builtin_tend: i = 0; l = 0; u = 1; break;
1673 case PPC::BI__builtin_tsr: i = 0; l = 0; u = 7; break;
1674 case PPC::BI__builtin_tabortwc:
1675 case PPC::BI__builtin_tabortdc: i = 0; l = 0; u = 31; break;
1676 case PPC::BI__builtin_tabortwci:
1677 case PPC::BI__builtin_tabortdci:
1678 return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31) ||
1679 SemaBuiltinConstantArgRange(TheCall, 2, 0, 31);
1681 return SemaBuiltinConstantArgRange(TheCall, i, l, u);
1684 bool Sema::CheckSystemZBuiltinFunctionCall(unsigned BuiltinID,
1685 CallExpr *TheCall) {
1686 if (BuiltinID == SystemZ::BI__builtin_tabort) {
1687 Expr *Arg = TheCall->getArg(0);
1688 llvm::APSInt AbortCode(32);
1689 if (Arg->isIntegerConstantExpr(AbortCode, Context) &&
1690 AbortCode.getSExtValue() >= 0 && AbortCode.getSExtValue() < 256)
1691 return Diag(Arg->getLocStart(), diag::err_systemz_invalid_tabort_code)
1692 << Arg->getSourceRange();
1695 // For intrinsics which take an immediate value as part of the instruction,
1696 // range check them here.
1697 unsigned i = 0, l = 0, u = 0;
1698 switch (BuiltinID) {
1699 default: return false;
1700 case SystemZ::BI__builtin_s390_lcbb: i = 1; l = 0; u = 15; break;
1701 case SystemZ::BI__builtin_s390_verimb:
1702 case SystemZ::BI__builtin_s390_verimh:
1703 case SystemZ::BI__builtin_s390_verimf:
1704 case SystemZ::BI__builtin_s390_verimg: i = 3; l = 0; u = 255; break;
1705 case SystemZ::BI__builtin_s390_vfaeb:
1706 case SystemZ::BI__builtin_s390_vfaeh:
1707 case SystemZ::BI__builtin_s390_vfaef:
1708 case SystemZ::BI__builtin_s390_vfaebs:
1709 case SystemZ::BI__builtin_s390_vfaehs:
1710 case SystemZ::BI__builtin_s390_vfaefs:
1711 case SystemZ::BI__builtin_s390_vfaezb:
1712 case SystemZ::BI__builtin_s390_vfaezh:
1713 case SystemZ::BI__builtin_s390_vfaezf:
1714 case SystemZ::BI__builtin_s390_vfaezbs:
1715 case SystemZ::BI__builtin_s390_vfaezhs:
1716 case SystemZ::BI__builtin_s390_vfaezfs: i = 2; l = 0; u = 15; break;
1717 case SystemZ::BI__builtin_s390_vfidb:
1718 return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15) ||
1719 SemaBuiltinConstantArgRange(TheCall, 2, 0, 15);
1720 case SystemZ::BI__builtin_s390_vftcidb: i = 1; l = 0; u = 4095; break;
1721 case SystemZ::BI__builtin_s390_vlbb: i = 1; l = 0; u = 15; break;
1722 case SystemZ::BI__builtin_s390_vpdi: i = 2; l = 0; u = 15; break;
1723 case SystemZ::BI__builtin_s390_vsldb: i = 2; l = 0; u = 15; break;
1724 case SystemZ::BI__builtin_s390_vstrcb:
1725 case SystemZ::BI__builtin_s390_vstrch:
1726 case SystemZ::BI__builtin_s390_vstrcf:
1727 case SystemZ::BI__builtin_s390_vstrczb:
1728 case SystemZ::BI__builtin_s390_vstrczh:
1729 case SystemZ::BI__builtin_s390_vstrczf:
1730 case SystemZ::BI__builtin_s390_vstrcbs:
1731 case SystemZ::BI__builtin_s390_vstrchs:
1732 case SystemZ::BI__builtin_s390_vstrcfs:
1733 case SystemZ::BI__builtin_s390_vstrczbs:
1734 case SystemZ::BI__builtin_s390_vstrczhs:
1735 case SystemZ::BI__builtin_s390_vstrczfs: i = 3; l = 0; u = 15; break;
1737 return SemaBuiltinConstantArgRange(TheCall, i, l, u);
1740 /// SemaBuiltinCpuSupports - Handle __builtin_cpu_supports(char *).
1741 /// This checks that the target supports __builtin_cpu_supports and
1742 /// that the string argument is constant and valid.
1743 static bool SemaBuiltinCpuSupports(Sema &S, CallExpr *TheCall) {
1744 Expr *Arg = TheCall->getArg(0);
1746 // Check if the argument is a string literal.
1747 if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
1748 return S.Diag(TheCall->getLocStart(), diag::err_expr_not_string_literal)
1749 << Arg->getSourceRange();
1751 // Check the contents of the string.
1753 cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
1754 if (!S.Context.getTargetInfo().validateCpuSupports(Feature))
1755 return S.Diag(TheCall->getLocStart(), diag::err_invalid_cpu_supports)
1756 << Arg->getSourceRange();
1760 bool Sema::CheckX86BuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
1761 int i = 0, l = 0, u = 0;
1762 switch (BuiltinID) {
1765 case X86::BI__builtin_cpu_supports:
1766 return SemaBuiltinCpuSupports(*this, TheCall);
1767 case X86::BI__builtin_ms_va_start:
1768 return SemaBuiltinMSVAStart(TheCall);
1769 case X86::BI__builtin_ia32_extractf64x4_mask:
1770 case X86::BI__builtin_ia32_extracti64x4_mask:
1771 case X86::BI__builtin_ia32_extractf32x8_mask:
1772 case X86::BI__builtin_ia32_extracti32x8_mask:
1773 case X86::BI__builtin_ia32_extractf64x2_256_mask:
1774 case X86::BI__builtin_ia32_extracti64x2_256_mask:
1775 case X86::BI__builtin_ia32_extractf32x4_256_mask:
1776 case X86::BI__builtin_ia32_extracti32x4_256_mask:
1777 i = 1; l = 0; u = 1;
1779 case X86::BI_mm_prefetch:
1780 case X86::BI__builtin_ia32_extractf32x4_mask:
1781 case X86::BI__builtin_ia32_extracti32x4_mask:
1782 case X86::BI__builtin_ia32_extractf64x2_512_mask:
1783 case X86::BI__builtin_ia32_extracti64x2_512_mask:
1784 i = 1; l = 0; u = 3;
1786 case X86::BI__builtin_ia32_insertf32x8_mask:
1787 case X86::BI__builtin_ia32_inserti32x8_mask:
1788 case X86::BI__builtin_ia32_insertf64x4_mask:
1789 case X86::BI__builtin_ia32_inserti64x4_mask:
1790 case X86::BI__builtin_ia32_insertf64x2_256_mask:
1791 case X86::BI__builtin_ia32_inserti64x2_256_mask:
1792 case X86::BI__builtin_ia32_insertf32x4_256_mask:
1793 case X86::BI__builtin_ia32_inserti32x4_256_mask:
1794 i = 2; l = 0; u = 1;
1796 case X86::BI__builtin_ia32_sha1rnds4:
1797 case X86::BI__builtin_ia32_shuf_f32x4_256_mask:
1798 case X86::BI__builtin_ia32_shuf_f64x2_256_mask:
1799 case X86::BI__builtin_ia32_shuf_i32x4_256_mask:
1800 case X86::BI__builtin_ia32_shuf_i64x2_256_mask:
1801 case X86::BI__builtin_ia32_insertf64x2_512_mask:
1802 case X86::BI__builtin_ia32_inserti64x2_512_mask:
1803 case X86::BI__builtin_ia32_insertf32x4_mask:
1804 case X86::BI__builtin_ia32_inserti32x4_mask:
1805 i = 2; l = 0; u = 3;
1807 case X86::BI__builtin_ia32_vpermil2pd:
1808 case X86::BI__builtin_ia32_vpermil2pd256:
1809 case X86::BI__builtin_ia32_vpermil2ps:
1810 case X86::BI__builtin_ia32_vpermil2ps256:
1811 i = 3; l = 0; u = 3;
1813 case X86::BI__builtin_ia32_cmpb128_mask:
1814 case X86::BI__builtin_ia32_cmpw128_mask:
1815 case X86::BI__builtin_ia32_cmpd128_mask:
1816 case X86::BI__builtin_ia32_cmpq128_mask:
1817 case X86::BI__builtin_ia32_cmpb256_mask:
1818 case X86::BI__builtin_ia32_cmpw256_mask:
1819 case X86::BI__builtin_ia32_cmpd256_mask:
1820 case X86::BI__builtin_ia32_cmpq256_mask:
1821 case X86::BI__builtin_ia32_cmpb512_mask:
1822 case X86::BI__builtin_ia32_cmpw512_mask:
1823 case X86::BI__builtin_ia32_cmpd512_mask:
1824 case X86::BI__builtin_ia32_cmpq512_mask:
1825 case X86::BI__builtin_ia32_ucmpb128_mask:
1826 case X86::BI__builtin_ia32_ucmpw128_mask:
1827 case X86::BI__builtin_ia32_ucmpd128_mask:
1828 case X86::BI__builtin_ia32_ucmpq128_mask:
1829 case X86::BI__builtin_ia32_ucmpb256_mask:
1830 case X86::BI__builtin_ia32_ucmpw256_mask:
1831 case X86::BI__builtin_ia32_ucmpd256_mask:
1832 case X86::BI__builtin_ia32_ucmpq256_mask:
1833 case X86::BI__builtin_ia32_ucmpb512_mask:
1834 case X86::BI__builtin_ia32_ucmpw512_mask:
1835 case X86::BI__builtin_ia32_ucmpd512_mask:
1836 case X86::BI__builtin_ia32_ucmpq512_mask:
1837 case X86::BI__builtin_ia32_vpcomub:
1838 case X86::BI__builtin_ia32_vpcomuw:
1839 case X86::BI__builtin_ia32_vpcomud:
1840 case X86::BI__builtin_ia32_vpcomuq:
1841 case X86::BI__builtin_ia32_vpcomb:
1842 case X86::BI__builtin_ia32_vpcomw:
1843 case X86::BI__builtin_ia32_vpcomd:
1844 case X86::BI__builtin_ia32_vpcomq:
1845 i = 2; l = 0; u = 7;
1847 case X86::BI__builtin_ia32_roundps:
1848 case X86::BI__builtin_ia32_roundpd:
1849 case X86::BI__builtin_ia32_roundps256:
1850 case X86::BI__builtin_ia32_roundpd256:
1851 i = 1; l = 0; u = 15;
1853 case X86::BI__builtin_ia32_roundss:
1854 case X86::BI__builtin_ia32_roundsd:
1855 case X86::BI__builtin_ia32_rangepd128_mask:
1856 case X86::BI__builtin_ia32_rangepd256_mask:
1857 case X86::BI__builtin_ia32_rangepd512_mask:
1858 case X86::BI__builtin_ia32_rangeps128_mask:
1859 case X86::BI__builtin_ia32_rangeps256_mask:
1860 case X86::BI__builtin_ia32_rangeps512_mask:
1861 case X86::BI__builtin_ia32_getmantsd_round_mask:
1862 case X86::BI__builtin_ia32_getmantss_round_mask:
1863 i = 2; l = 0; u = 15;
1865 case X86::BI__builtin_ia32_cmpps:
1866 case X86::BI__builtin_ia32_cmpss:
1867 case X86::BI__builtin_ia32_cmppd:
1868 case X86::BI__builtin_ia32_cmpsd:
1869 case X86::BI__builtin_ia32_cmpps256:
1870 case X86::BI__builtin_ia32_cmppd256:
1871 case X86::BI__builtin_ia32_cmpps128_mask:
1872 case X86::BI__builtin_ia32_cmppd128_mask:
1873 case X86::BI__builtin_ia32_cmpps256_mask:
1874 case X86::BI__builtin_ia32_cmppd256_mask:
1875 case X86::BI__builtin_ia32_cmpps512_mask:
1876 case X86::BI__builtin_ia32_cmppd512_mask:
1877 case X86::BI__builtin_ia32_cmpsd_mask:
1878 case X86::BI__builtin_ia32_cmpss_mask:
1879 i = 2; l = 0; u = 31;
1881 case X86::BI__builtin_ia32_xabort:
1882 i = 0; l = -128; u = 255;
1884 case X86::BI__builtin_ia32_pshufw:
1885 case X86::BI__builtin_ia32_aeskeygenassist128:
1886 i = 1; l = -128; u = 255;
1888 case X86::BI__builtin_ia32_vcvtps2ph:
1889 case X86::BI__builtin_ia32_vcvtps2ph256:
1890 case X86::BI__builtin_ia32_rndscaleps_128_mask:
1891 case X86::BI__builtin_ia32_rndscalepd_128_mask:
1892 case X86::BI__builtin_ia32_rndscaleps_256_mask:
1893 case X86::BI__builtin_ia32_rndscalepd_256_mask:
1894 case X86::BI__builtin_ia32_rndscaleps_mask:
1895 case X86::BI__builtin_ia32_rndscalepd_mask:
1896 case X86::BI__builtin_ia32_reducepd128_mask:
1897 case X86::BI__builtin_ia32_reducepd256_mask:
1898 case X86::BI__builtin_ia32_reducepd512_mask:
1899 case X86::BI__builtin_ia32_reduceps128_mask:
1900 case X86::BI__builtin_ia32_reduceps256_mask:
1901 case X86::BI__builtin_ia32_reduceps512_mask:
1902 case X86::BI__builtin_ia32_prold512_mask:
1903 case X86::BI__builtin_ia32_prolq512_mask:
1904 case X86::BI__builtin_ia32_prold128_mask:
1905 case X86::BI__builtin_ia32_prold256_mask:
1906 case X86::BI__builtin_ia32_prolq128_mask:
1907 case X86::BI__builtin_ia32_prolq256_mask:
1908 case X86::BI__builtin_ia32_prord128_mask:
1909 case X86::BI__builtin_ia32_prord256_mask:
1910 case X86::BI__builtin_ia32_prorq128_mask:
1911 case X86::BI__builtin_ia32_prorq256_mask:
1912 case X86::BI__builtin_ia32_psllwi512_mask:
1913 case X86::BI__builtin_ia32_psllwi128_mask:
1914 case X86::BI__builtin_ia32_psllwi256_mask:
1915 case X86::BI__builtin_ia32_psrldi128_mask:
1916 case X86::BI__builtin_ia32_psrldi256_mask:
1917 case X86::BI__builtin_ia32_psrldi512_mask:
1918 case X86::BI__builtin_ia32_psrlqi128_mask:
1919 case X86::BI__builtin_ia32_psrlqi256_mask:
1920 case X86::BI__builtin_ia32_psrlqi512_mask:
1921 case X86::BI__builtin_ia32_psrawi512_mask:
1922 case X86::BI__builtin_ia32_psrawi128_mask:
1923 case X86::BI__builtin_ia32_psrawi256_mask:
1924 case X86::BI__builtin_ia32_psrlwi512_mask:
1925 case X86::BI__builtin_ia32_psrlwi128_mask:
1926 case X86::BI__builtin_ia32_psrlwi256_mask:
1927 case X86::BI__builtin_ia32_psradi128_mask:
1928 case X86::BI__builtin_ia32_psradi256_mask:
1929 case X86::BI__builtin_ia32_psradi512_mask:
1930 case X86::BI__builtin_ia32_psraqi128_mask:
1931 case X86::BI__builtin_ia32_psraqi256_mask:
1932 case X86::BI__builtin_ia32_psraqi512_mask:
1933 case X86::BI__builtin_ia32_pslldi128_mask:
1934 case X86::BI__builtin_ia32_pslldi256_mask:
1935 case X86::BI__builtin_ia32_pslldi512_mask:
1936 case X86::BI__builtin_ia32_psllqi128_mask:
1937 case X86::BI__builtin_ia32_psllqi256_mask:
1938 case X86::BI__builtin_ia32_psllqi512_mask:
1939 case X86::BI__builtin_ia32_fpclasspd128_mask:
1940 case X86::BI__builtin_ia32_fpclasspd256_mask:
1941 case X86::BI__builtin_ia32_fpclassps128_mask:
1942 case X86::BI__builtin_ia32_fpclassps256_mask:
1943 case X86::BI__builtin_ia32_fpclassps512_mask:
1944 case X86::BI__builtin_ia32_fpclasspd512_mask:
1945 case X86::BI__builtin_ia32_fpclasssd_mask:
1946 case X86::BI__builtin_ia32_fpclassss_mask:
1947 i = 1; l = 0; u = 255;
1949 case X86::BI__builtin_ia32_palignr:
1950 case X86::BI__builtin_ia32_insertps128:
1951 case X86::BI__builtin_ia32_dpps:
1952 case X86::BI__builtin_ia32_dppd:
1953 case X86::BI__builtin_ia32_dpps256:
1954 case X86::BI__builtin_ia32_mpsadbw128:
1955 case X86::BI__builtin_ia32_mpsadbw256:
1956 case X86::BI__builtin_ia32_pcmpistrm128:
1957 case X86::BI__builtin_ia32_pcmpistri128:
1958 case X86::BI__builtin_ia32_pcmpistria128:
1959 case X86::BI__builtin_ia32_pcmpistric128:
1960 case X86::BI__builtin_ia32_pcmpistrio128:
1961 case X86::BI__builtin_ia32_pcmpistris128:
1962 case X86::BI__builtin_ia32_pcmpistriz128:
1963 case X86::BI__builtin_ia32_pclmulqdq128:
1964 case X86::BI__builtin_ia32_vperm2f128_pd256:
1965 case X86::BI__builtin_ia32_vperm2f128_ps256:
1966 case X86::BI__builtin_ia32_vperm2f128_si256:
1967 case X86::BI__builtin_ia32_permti256:
1968 i = 2; l = -128; u = 255;
1970 case X86::BI__builtin_ia32_palignr128:
1971 case X86::BI__builtin_ia32_palignr256:
1972 case X86::BI__builtin_ia32_palignr128_mask:
1973 case X86::BI__builtin_ia32_palignr256_mask:
1974 case X86::BI__builtin_ia32_palignr512_mask:
1975 case X86::BI__builtin_ia32_alignq512_mask:
1976 case X86::BI__builtin_ia32_alignd512_mask:
1977 case X86::BI__builtin_ia32_alignd128_mask:
1978 case X86::BI__builtin_ia32_alignd256_mask:
1979 case X86::BI__builtin_ia32_alignq128_mask:
1980 case X86::BI__builtin_ia32_alignq256_mask:
1981 case X86::BI__builtin_ia32_vcomisd:
1982 case X86::BI__builtin_ia32_vcomiss:
1983 case X86::BI__builtin_ia32_shuf_f32x4_mask:
1984 case X86::BI__builtin_ia32_shuf_f64x2_mask:
1985 case X86::BI__builtin_ia32_shuf_i32x4_mask:
1986 case X86::BI__builtin_ia32_shuf_i64x2_mask:
1987 case X86::BI__builtin_ia32_dbpsadbw128_mask:
1988 case X86::BI__builtin_ia32_dbpsadbw256_mask:
1989 case X86::BI__builtin_ia32_dbpsadbw512_mask:
1990 i = 2; l = 0; u = 255;
1992 case X86::BI__builtin_ia32_fixupimmpd512_mask:
1993 case X86::BI__builtin_ia32_fixupimmpd512_maskz:
1994 case X86::BI__builtin_ia32_fixupimmps512_mask:
1995 case X86::BI__builtin_ia32_fixupimmps512_maskz:
1996 case X86::BI__builtin_ia32_fixupimmsd_mask:
1997 case X86::BI__builtin_ia32_fixupimmsd_maskz:
1998 case X86::BI__builtin_ia32_fixupimmss_mask:
1999 case X86::BI__builtin_ia32_fixupimmss_maskz:
2000 case X86::BI__builtin_ia32_fixupimmpd128_mask:
2001 case X86::BI__builtin_ia32_fixupimmpd128_maskz:
2002 case X86::BI__builtin_ia32_fixupimmpd256_mask:
2003 case X86::BI__builtin_ia32_fixupimmpd256_maskz:
2004 case X86::BI__builtin_ia32_fixupimmps128_mask:
2005 case X86::BI__builtin_ia32_fixupimmps128_maskz:
2006 case X86::BI__builtin_ia32_fixupimmps256_mask:
2007 case X86::BI__builtin_ia32_fixupimmps256_maskz:
2008 case X86::BI__builtin_ia32_pternlogd512_mask:
2009 case X86::BI__builtin_ia32_pternlogd512_maskz:
2010 case X86::BI__builtin_ia32_pternlogq512_mask:
2011 case X86::BI__builtin_ia32_pternlogq512_maskz:
2012 case X86::BI__builtin_ia32_pternlogd128_mask:
2013 case X86::BI__builtin_ia32_pternlogd128_maskz:
2014 case X86::BI__builtin_ia32_pternlogd256_mask:
2015 case X86::BI__builtin_ia32_pternlogd256_maskz:
2016 case X86::BI__builtin_ia32_pternlogq128_mask:
2017 case X86::BI__builtin_ia32_pternlogq128_maskz:
2018 case X86::BI__builtin_ia32_pternlogq256_mask:
2019 case X86::BI__builtin_ia32_pternlogq256_maskz:
2020 i = 3; l = 0; u = 255;
2022 case X86::BI__builtin_ia32_pcmpestrm128:
2023 case X86::BI__builtin_ia32_pcmpestri128:
2024 case X86::BI__builtin_ia32_pcmpestria128:
2025 case X86::BI__builtin_ia32_pcmpestric128:
2026 case X86::BI__builtin_ia32_pcmpestrio128:
2027 case X86::BI__builtin_ia32_pcmpestris128:
2028 case X86::BI__builtin_ia32_pcmpestriz128:
2029 i = 4; l = -128; u = 255;
2031 case X86::BI__builtin_ia32_rndscalesd_round_mask:
2032 case X86::BI__builtin_ia32_rndscaless_round_mask:
2033 i = 4; l = 0; u = 255;
2036 return SemaBuiltinConstantArgRange(TheCall, i, l, u);
2039 /// Given a FunctionDecl's FormatAttr, attempts to populate the FomatStringInfo
2040 /// parameter with the FormatAttr's correct format_idx and firstDataArg.
2041 /// Returns true when the format fits the function and the FormatStringInfo has
2043 bool Sema::getFormatStringInfo(const FormatAttr *Format, bool IsCXXMember,
2044 FormatStringInfo *FSI) {
2045 FSI->HasVAListArg = Format->getFirstArg() == 0;
2046 FSI->FormatIdx = Format->getFormatIdx() - 1;
2047 FSI->FirstDataArg = FSI->HasVAListArg ? 0 : Format->getFirstArg() - 1;
2049 // The way the format attribute works in GCC, the implicit this argument
2050 // of member functions is counted. However, it doesn't appear in our own
2051 // lists, so decrement format_idx in that case.
2053 if(FSI->FormatIdx == 0)
2056 if (FSI->FirstDataArg != 0)
2057 --FSI->FirstDataArg;
2062 /// Checks if a the given expression evaluates to null.
2064 /// \brief Returns true if the value evaluates to null.
2065 static bool CheckNonNullExpr(Sema &S, const Expr *Expr) {
2066 // If the expression has non-null type, it doesn't evaluate to null.
2067 if (auto nullability
2068 = Expr->IgnoreImplicit()->getType()->getNullability(S.Context)) {
2069 if (*nullability == NullabilityKind::NonNull)
2073 // As a special case, transparent unions initialized with zero are
2074 // considered null for the purposes of the nonnull attribute.
2075 if (const RecordType *UT = Expr->getType()->getAsUnionType()) {
2076 if (UT->getDecl()->hasAttr<TransparentUnionAttr>())
2077 if (const CompoundLiteralExpr *CLE =
2078 dyn_cast<CompoundLiteralExpr>(Expr))
2079 if (const InitListExpr *ILE =
2080 dyn_cast<InitListExpr>(CLE->getInitializer()))
2081 Expr = ILE->getInit(0);
2085 return (!Expr->isValueDependent() &&
2086 Expr->EvaluateAsBooleanCondition(Result, S.Context) &&
2090 static void CheckNonNullArgument(Sema &S,
2091 const Expr *ArgExpr,
2092 SourceLocation CallSiteLoc) {
2093 if (CheckNonNullExpr(S, ArgExpr))
2094 S.DiagRuntimeBehavior(CallSiteLoc, ArgExpr,
2095 S.PDiag(diag::warn_null_arg) << ArgExpr->getSourceRange());
2098 bool Sema::GetFormatNSStringIdx(const FormatAttr *Format, unsigned &Idx) {
2099 FormatStringInfo FSI;
2100 if ((GetFormatStringType(Format) == FST_NSString) &&
2101 getFormatStringInfo(Format, false, &FSI)) {
2102 Idx = FSI.FormatIdx;
2107 /// \brief Diagnose use of %s directive in an NSString which is being passed
2108 /// as formatting string to formatting method.
2110 DiagnoseCStringFormatDirectiveInCFAPI(Sema &S,
2111 const NamedDecl *FDecl,
2115 bool Format = false;
2116 ObjCStringFormatFamily SFFamily = FDecl->getObjCFStringFormattingFamily();
2117 if (SFFamily == ObjCStringFormatFamily::SFF_CFString) {
2122 for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
2123 if (S.GetFormatNSStringIdx(I, Idx)) {
2128 if (!Format || NumArgs <= Idx)
2130 const Expr *FormatExpr = Args[Idx];
2131 if (const CStyleCastExpr *CSCE = dyn_cast<CStyleCastExpr>(FormatExpr))
2132 FormatExpr = CSCE->getSubExpr();
2133 const StringLiteral *FormatString;
2134 if (const ObjCStringLiteral *OSL =
2135 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts()))
2136 FormatString = OSL->getString();
2138 FormatString = dyn_cast<StringLiteral>(FormatExpr->IgnoreParenImpCasts());
2141 if (S.FormatStringHasSArg(FormatString)) {
2142 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2144 S.Diag(FDecl->getLocation(), diag::note_entity_declared_at)
2145 << FDecl->getDeclName();
2149 /// Determine whether the given type has a non-null nullability annotation.
2150 static bool isNonNullType(ASTContext &ctx, QualType type) {
2151 if (auto nullability = type->getNullability(ctx))
2152 return *nullability == NullabilityKind::NonNull;
2157 static void CheckNonNullArguments(Sema &S,
2158 const NamedDecl *FDecl,
2159 const FunctionProtoType *Proto,
2160 ArrayRef<const Expr *> Args,
2161 SourceLocation CallSiteLoc) {
2162 assert((FDecl || Proto) && "Need a function declaration or prototype");
2164 // Check the attributes attached to the method/function itself.
2165 llvm::SmallBitVector NonNullArgs;
2167 // Handle the nonnull attribute on the function/method declaration itself.
2168 for (const auto *NonNull : FDecl->specific_attrs<NonNullAttr>()) {
2169 if (!NonNull->args_size()) {
2170 // Easy case: all pointer arguments are nonnull.
2171 for (const auto *Arg : Args)
2172 if (S.isValidPointerAttrType(Arg->getType()))
2173 CheckNonNullArgument(S, Arg, CallSiteLoc);
2177 for (unsigned Val : NonNull->args()) {
2178 if (Val >= Args.size())
2180 if (NonNullArgs.empty())
2181 NonNullArgs.resize(Args.size());
2182 NonNullArgs.set(Val);
2187 if (FDecl && (isa<FunctionDecl>(FDecl) || isa<ObjCMethodDecl>(FDecl))) {
2188 // Handle the nonnull attribute on the parameters of the
2190 ArrayRef<ParmVarDecl*> parms;
2191 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FDecl))
2192 parms = FD->parameters();
2194 parms = cast<ObjCMethodDecl>(FDecl)->parameters();
2196 unsigned ParamIndex = 0;
2197 for (ArrayRef<ParmVarDecl*>::iterator I = parms.begin(), E = parms.end();
2198 I != E; ++I, ++ParamIndex) {
2199 const ParmVarDecl *PVD = *I;
2200 if (PVD->hasAttr<NonNullAttr>() ||
2201 isNonNullType(S.Context, PVD->getType())) {
2202 if (NonNullArgs.empty())
2203 NonNullArgs.resize(Args.size());
2205 NonNullArgs.set(ParamIndex);
2209 // If we have a non-function, non-method declaration but no
2210 // function prototype, try to dig out the function prototype.
2212 if (const ValueDecl *VD = dyn_cast<ValueDecl>(FDecl)) {
2213 QualType type = VD->getType().getNonReferenceType();
2214 if (auto pointerType = type->getAs<PointerType>())
2215 type = pointerType->getPointeeType();
2216 else if (auto blockType = type->getAs<BlockPointerType>())
2217 type = blockType->getPointeeType();
2218 // FIXME: data member pointers?
2220 // Dig out the function prototype, if there is one.
2221 Proto = type->getAs<FunctionProtoType>();
2225 // Fill in non-null argument information from the nullability
2226 // information on the parameter types (if we have them).
2229 for (auto paramType : Proto->getParamTypes()) {
2230 if (isNonNullType(S.Context, paramType)) {
2231 if (NonNullArgs.empty())
2232 NonNullArgs.resize(Args.size());
2234 NonNullArgs.set(Index);
2242 // Check for non-null arguments.
2243 for (unsigned ArgIndex = 0, ArgIndexEnd = NonNullArgs.size();
2244 ArgIndex != ArgIndexEnd; ++ArgIndex) {
2245 if (NonNullArgs[ArgIndex])
2246 CheckNonNullArgument(S, Args[ArgIndex], CallSiteLoc);
2250 /// Handles the checks for format strings, non-POD arguments to vararg
2251 /// functions, and NULL arguments passed to non-NULL parameters.
2252 void Sema::checkCall(NamedDecl *FDecl, const FunctionProtoType *Proto,
2253 ArrayRef<const Expr *> Args, bool IsMemberFunction,
2254 SourceLocation Loc, SourceRange Range,
2255 VariadicCallType CallType) {
2256 // FIXME: We should check as much as we can in the template definition.
2257 if (CurContext->isDependentContext())
2260 // Printf and scanf checking.
2261 llvm::SmallBitVector CheckedVarArgs;
2263 for (const auto *I : FDecl->specific_attrs<FormatAttr>()) {
2264 // Only create vector if there are format attributes.
2265 CheckedVarArgs.resize(Args.size());
2267 CheckFormatArguments(I, Args, IsMemberFunction, CallType, Loc, Range,
2272 // Refuse POD arguments that weren't caught by the format string
2274 if (CallType != VariadicDoesNotApply) {
2275 unsigned NumParams = Proto ? Proto->getNumParams()
2276 : FDecl && isa<FunctionDecl>(FDecl)
2277 ? cast<FunctionDecl>(FDecl)->getNumParams()
2278 : FDecl && isa<ObjCMethodDecl>(FDecl)
2279 ? cast<ObjCMethodDecl>(FDecl)->param_size()
2282 for (unsigned ArgIdx = NumParams; ArgIdx < Args.size(); ++ArgIdx) {
2283 // Args[ArgIdx] can be null in malformed code.
2284 if (const Expr *Arg = Args[ArgIdx]) {
2285 if (CheckedVarArgs.empty() || !CheckedVarArgs[ArgIdx])
2286 checkVariadicArgument(Arg, CallType);
2291 if (FDecl || Proto) {
2292 CheckNonNullArguments(*this, FDecl, Proto, Args, Loc);
2294 // Type safety checking.
2296 for (const auto *I : FDecl->specific_attrs<ArgumentWithTypeTagAttr>())
2297 CheckArgumentWithTypeTag(I, Args.data());
2302 /// CheckConstructorCall - Check a constructor call for correctness and safety
2303 /// properties not enforced by the C type system.
2304 void Sema::CheckConstructorCall(FunctionDecl *FDecl,
2305 ArrayRef<const Expr *> Args,
2306 const FunctionProtoType *Proto,
2307 SourceLocation Loc) {
2308 VariadicCallType CallType =
2309 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply;
2310 checkCall(FDecl, Proto, Args, /*IsMemberFunction=*/true, Loc, SourceRange(),
2314 /// CheckFunctionCall - Check a direct function call for various correctness
2315 /// and safety properties not strictly enforced by the C type system.
2316 bool Sema::CheckFunctionCall(FunctionDecl *FDecl, CallExpr *TheCall,
2317 const FunctionProtoType *Proto) {
2318 bool IsMemberOperatorCall = isa<CXXOperatorCallExpr>(TheCall) &&
2319 isa<CXXMethodDecl>(FDecl);
2320 bool IsMemberFunction = isa<CXXMemberCallExpr>(TheCall) ||
2321 IsMemberOperatorCall;
2322 VariadicCallType CallType = getVariadicCallType(FDecl, Proto,
2323 TheCall->getCallee());
2324 Expr** Args = TheCall->getArgs();
2325 unsigned NumArgs = TheCall->getNumArgs();
2326 if (IsMemberOperatorCall) {
2327 // If this is a call to a member operator, hide the first argument
2329 // FIXME: Our choice of AST representation here is less than ideal.
2333 checkCall(FDecl, Proto, llvm::makeArrayRef(Args, NumArgs),
2334 IsMemberFunction, TheCall->getRParenLoc(),
2335 TheCall->getCallee()->getSourceRange(), CallType);
2337 IdentifierInfo *FnInfo = FDecl->getIdentifier();
2338 // None of the checks below are needed for functions that don't have
2339 // simple names (e.g., C++ conversion functions).
2343 CheckAbsoluteValueFunction(TheCall, FDecl, FnInfo);
2344 if (getLangOpts().ObjC1)
2345 DiagnoseCStringFormatDirectiveInCFAPI(*this, FDecl, Args, NumArgs);
2347 unsigned CMId = FDecl->getMemoryFunctionKind();
2351 // Handle memory setting and copying functions.
2352 if (CMId == Builtin::BIstrlcpy || CMId == Builtin::BIstrlcat)
2353 CheckStrlcpycatArguments(TheCall, FnInfo);
2354 else if (CMId == Builtin::BIstrncat)
2355 CheckStrncatArguments(TheCall, FnInfo);
2357 CheckMemaccessArguments(TheCall, CMId, FnInfo);
2362 bool Sema::CheckObjCMethodCall(ObjCMethodDecl *Method, SourceLocation lbrac,
2363 ArrayRef<const Expr *> Args) {
2364 VariadicCallType CallType =
2365 Method->isVariadic() ? VariadicMethod : VariadicDoesNotApply;
2367 checkCall(Method, nullptr, Args,
2368 /*IsMemberFunction=*/false, lbrac, Method->getSourceRange(),
2374 bool Sema::CheckPointerCall(NamedDecl *NDecl, CallExpr *TheCall,
2375 const FunctionProtoType *Proto) {
2377 if (const auto *V = dyn_cast<VarDecl>(NDecl))
2378 Ty = V->getType().getNonReferenceType();
2379 else if (const auto *F = dyn_cast<FieldDecl>(NDecl))
2380 Ty = F->getType().getNonReferenceType();
2384 if (!Ty->isBlockPointerType() && !Ty->isFunctionPointerType() &&
2385 !Ty->isFunctionProtoType())
2388 VariadicCallType CallType;
2389 if (!Proto || !Proto->isVariadic()) {
2390 CallType = VariadicDoesNotApply;
2391 } else if (Ty->isBlockPointerType()) {
2392 CallType = VariadicBlock;
2393 } else { // Ty->isFunctionPointerType()
2394 CallType = VariadicFunction;
2397 checkCall(NDecl, Proto,
2398 llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
2399 /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
2400 TheCall->getCallee()->getSourceRange(), CallType);
2405 /// Checks function calls when a FunctionDecl or a NamedDecl is not available,
2406 /// such as function pointers returned from functions.
2407 bool Sema::CheckOtherCall(CallExpr *TheCall, const FunctionProtoType *Proto) {
2408 VariadicCallType CallType = getVariadicCallType(/*FDecl=*/nullptr, Proto,
2409 TheCall->getCallee());
2410 checkCall(/*FDecl=*/nullptr, Proto,
2411 llvm::makeArrayRef(TheCall->getArgs(), TheCall->getNumArgs()),
2412 /*IsMemberFunction=*/false, TheCall->getRParenLoc(),
2413 TheCall->getCallee()->getSourceRange(), CallType);
2418 static bool isValidOrderingForOp(int64_t Ordering, AtomicExpr::AtomicOp Op) {
2419 if (!llvm::isValidAtomicOrderingCABI(Ordering))
2422 auto OrderingCABI = (llvm::AtomicOrderingCABI)Ordering;
2424 case AtomicExpr::AO__c11_atomic_init:
2425 llvm_unreachable("There is no ordering argument for an init");
2427 case AtomicExpr::AO__c11_atomic_load:
2428 case AtomicExpr::AO__atomic_load_n:
2429 case AtomicExpr::AO__atomic_load:
2430 return OrderingCABI != llvm::AtomicOrderingCABI::release &&
2431 OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
2433 case AtomicExpr::AO__c11_atomic_store:
2434 case AtomicExpr::AO__atomic_store:
2435 case AtomicExpr::AO__atomic_store_n:
2436 return OrderingCABI != llvm::AtomicOrderingCABI::consume &&
2437 OrderingCABI != llvm::AtomicOrderingCABI::acquire &&
2438 OrderingCABI != llvm::AtomicOrderingCABI::acq_rel;
2445 ExprResult Sema::SemaAtomicOpsOverloaded(ExprResult TheCallResult,
2446 AtomicExpr::AtomicOp Op) {
2447 CallExpr *TheCall = cast<CallExpr>(TheCallResult.get());
2448 DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
2450 // All these operations take one of the following forms:
2452 // C __c11_atomic_init(A *, C)
2454 // C __c11_atomic_load(A *, int)
2456 // void __atomic_load(A *, CP, int)
2458 // void __atomic_store(A *, CP, int)
2460 // C __c11_atomic_add(A *, M, int)
2462 // C __atomic_exchange_n(A *, CP, int)
2464 // void __atomic_exchange(A *, C *, CP, int)
2466 // bool __c11_atomic_compare_exchange_strong(A *, C *, CP, int, int)
2468 // bool __atomic_compare_exchange(A *, C *, CP, bool, int, int)
2471 const unsigned NumArgs[] = { 2, 2, 3, 3, 3, 3, 4, 5, 6 };
2472 const unsigned NumVals[] = { 1, 0, 1, 1, 1, 1, 2, 2, 3 };
2474 // C is an appropriate type,
2475 // A is volatile _Atomic(C) for __c11 builtins and is C for GNU builtins,
2476 // CP is C for __c11 builtins and GNU _n builtins and is C * otherwise,
2477 // M is C if C is an integer, and ptrdiff_t if C is a pointer, and
2478 // the int parameters are for orderings.
2480 static_assert(AtomicExpr::AO__c11_atomic_init == 0 &&
2481 AtomicExpr::AO__c11_atomic_fetch_xor + 1 ==
2482 AtomicExpr::AO__atomic_load,
2483 "need to update code for modified C11 atomics");
2484 bool IsC11 = Op >= AtomicExpr::AO__c11_atomic_init &&
2485 Op <= AtomicExpr::AO__c11_atomic_fetch_xor;
2486 bool IsN = Op == AtomicExpr::AO__atomic_load_n ||
2487 Op == AtomicExpr::AO__atomic_store_n ||
2488 Op == AtomicExpr::AO__atomic_exchange_n ||
2489 Op == AtomicExpr::AO__atomic_compare_exchange_n;
2490 bool IsAddSub = false;
2493 case AtomicExpr::AO__c11_atomic_init:
2497 case AtomicExpr::AO__c11_atomic_load:
2498 case AtomicExpr::AO__atomic_load_n:
2502 case AtomicExpr::AO__atomic_load:
2506 case AtomicExpr::AO__c11_atomic_store:
2507 case AtomicExpr::AO__atomic_store:
2508 case AtomicExpr::AO__atomic_store_n:
2512 case AtomicExpr::AO__c11_atomic_fetch_add:
2513 case AtomicExpr::AO__c11_atomic_fetch_sub:
2514 case AtomicExpr::AO__atomic_fetch_add:
2515 case AtomicExpr::AO__atomic_fetch_sub:
2516 case AtomicExpr::AO__atomic_add_fetch:
2517 case AtomicExpr::AO__atomic_sub_fetch:
2520 case AtomicExpr::AO__c11_atomic_fetch_and:
2521 case AtomicExpr::AO__c11_atomic_fetch_or:
2522 case AtomicExpr::AO__c11_atomic_fetch_xor:
2523 case AtomicExpr::AO__atomic_fetch_and:
2524 case AtomicExpr::AO__atomic_fetch_or:
2525 case AtomicExpr::AO__atomic_fetch_xor:
2526 case AtomicExpr::AO__atomic_fetch_nand:
2527 case AtomicExpr::AO__atomic_and_fetch:
2528 case AtomicExpr::AO__atomic_or_fetch:
2529 case AtomicExpr::AO__atomic_xor_fetch:
2530 case AtomicExpr::AO__atomic_nand_fetch:
2534 case AtomicExpr::AO__c11_atomic_exchange:
2535 case AtomicExpr::AO__atomic_exchange_n:
2539 case AtomicExpr::AO__atomic_exchange:
2543 case AtomicExpr::AO__c11_atomic_compare_exchange_strong:
2544 case AtomicExpr::AO__c11_atomic_compare_exchange_weak:
2548 case AtomicExpr::AO__atomic_compare_exchange:
2549 case AtomicExpr::AO__atomic_compare_exchange_n:
2554 // Check we have the right number of arguments.
2555 if (TheCall->getNumArgs() < NumArgs[Form]) {
2556 Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args)
2557 << 0 << NumArgs[Form] << TheCall->getNumArgs()
2558 << TheCall->getCallee()->getSourceRange();
2560 } else if (TheCall->getNumArgs() > NumArgs[Form]) {
2561 Diag(TheCall->getArg(NumArgs[Form])->getLocStart(),
2562 diag::err_typecheck_call_too_many_args)
2563 << 0 << NumArgs[Form] << TheCall->getNumArgs()
2564 << TheCall->getCallee()->getSourceRange();
2568 // Inspect the first argument of the atomic operation.
2569 Expr *Ptr = TheCall->getArg(0);
2570 ExprResult ConvertedPtr = DefaultFunctionArrayLvalueConversion(Ptr);
2571 if (ConvertedPtr.isInvalid())
2574 Ptr = ConvertedPtr.get();
2575 const PointerType *pointerType = Ptr->getType()->getAs<PointerType>();
2577 Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer)
2578 << Ptr->getType() << Ptr->getSourceRange();
2582 // For a __c11 builtin, this should be a pointer to an _Atomic type.
2583 QualType AtomTy = pointerType->getPointeeType(); // 'A'
2584 QualType ValType = AtomTy; // 'C'
2586 if (!AtomTy->isAtomicType()) {
2587 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic)
2588 << Ptr->getType() << Ptr->getSourceRange();
2591 if (AtomTy.isConstQualified()) {
2592 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_non_const_atomic)
2593 << Ptr->getType() << Ptr->getSourceRange();
2596 ValType = AtomTy->getAs<AtomicType>()->getValueType();
2597 } else if (Form != Load && Form != LoadCopy) {
2598 if (ValType.isConstQualified()) {
2599 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_non_const_pointer)
2600 << Ptr->getType() << Ptr->getSourceRange();
2605 // For an arithmetic operation, the implied arithmetic must be well-formed.
2606 if (Form == Arithmetic) {
2607 // gcc does not enforce these rules for GNU atomics, but we do so for sanity.
2608 if (IsAddSub && !ValType->isIntegerType() && !ValType->isPointerType()) {
2609 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic_int_or_ptr)
2610 << IsC11 << Ptr->getType() << Ptr->getSourceRange();
2613 if (!IsAddSub && !ValType->isIntegerType()) {
2614 Diag(DRE->getLocStart(), diag::err_atomic_op_bitwise_needs_atomic_int)
2615 << IsC11 << Ptr->getType() << Ptr->getSourceRange();
2618 if (IsC11 && ValType->isPointerType() &&
2619 RequireCompleteType(Ptr->getLocStart(), ValType->getPointeeType(),
2620 diag::err_incomplete_type)) {
2623 } else if (IsN && !ValType->isIntegerType() && !ValType->isPointerType()) {
2624 // For __atomic_*_n operations, the value type must be a scalar integral or
2625 // pointer type which is 1, 2, 4, 8 or 16 bytes in length.
2626 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_atomic_int_or_ptr)
2627 << IsC11 << Ptr->getType() << Ptr->getSourceRange();
2631 if (!IsC11 && !AtomTy.isTriviallyCopyableType(Context) &&
2632 !AtomTy->isScalarType()) {
2633 // For GNU atomics, require a trivially-copyable type. This is not part of
2634 // the GNU atomics specification, but we enforce it for sanity.
2635 Diag(DRE->getLocStart(), diag::err_atomic_op_needs_trivial_copy)
2636 << Ptr->getType() << Ptr->getSourceRange();
2640 switch (ValType.getObjCLifetime()) {
2641 case Qualifiers::OCL_None:
2642 case Qualifiers::OCL_ExplicitNone:
2646 case Qualifiers::OCL_Weak:
2647 case Qualifiers::OCL_Strong:
2648 case Qualifiers::OCL_Autoreleasing:
2649 // FIXME: Can this happen? By this point, ValType should be known
2650 // to be trivially copyable.
2651 Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership)
2652 << ValType << Ptr->getSourceRange();
2656 // atomic_fetch_or takes a pointer to a volatile 'A'. We shouldn't let the
2657 // volatile-ness of the pointee-type inject itself into the result or the
2658 // other operands. Similarly atomic_load can take a pointer to a const 'A'.
2659 ValType.removeLocalVolatile();
2660 ValType.removeLocalConst();
2661 QualType ResultType = ValType;
2662 if (Form == Copy || Form == LoadCopy || Form == GNUXchg || Form == Init)
2663 ResultType = Context.VoidTy;
2664 else if (Form == C11CmpXchg || Form == GNUCmpXchg)
2665 ResultType = Context.BoolTy;
2667 // The type of a parameter passed 'by value'. In the GNU atomics, such
2668 // arguments are actually passed as pointers.
2669 QualType ByValType = ValType; // 'CP'
2671 ByValType = Ptr->getType();
2673 // The first argument --- the pointer --- has a fixed type; we
2674 // deduce the types of the rest of the arguments accordingly. Walk
2675 // the remaining arguments, converting them to the deduced value type.
2676 for (unsigned i = 1; i != NumArgs[Form]; ++i) {
2678 if (i < NumVals[Form] + 1) {
2681 // The second argument is the non-atomic operand. For arithmetic, this
2682 // is always passed by value, and for a compare_exchange it is always
2683 // passed by address. For the rest, GNU uses by-address and C11 uses
2685 assert(Form != Load);
2686 if (Form == Init || (Form == Arithmetic && ValType->isIntegerType()))
2688 else if (Form == Copy || Form == Xchg)
2690 else if (Form == Arithmetic)
2691 Ty = Context.getPointerDiffType();
2693 Expr *ValArg = TheCall->getArg(i);
2695 // Keep address space of non-atomic pointer type.
2696 if (const PointerType *PtrTy =
2697 ValArg->getType()->getAs<PointerType>()) {
2698 AS = PtrTy->getPointeeType().getAddressSpace();
2700 Ty = Context.getPointerType(
2701 Context.getAddrSpaceQualType(ValType.getUnqualifiedType(), AS));
2705 // The third argument to compare_exchange / GNU exchange is a
2706 // (pointer to a) desired value.
2710 // The fourth argument to GNU compare_exchange is a 'weak' flag.
2711 Ty = Context.BoolTy;
2715 // The order(s) are always converted to int.
2719 InitializedEntity Entity =
2720 InitializedEntity::InitializeParameter(Context, Ty, false);
2721 ExprResult Arg = TheCall->getArg(i);
2722 Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
2723 if (Arg.isInvalid())
2725 TheCall->setArg(i, Arg.get());
2728 // Permute the arguments into a 'consistent' order.
2729 SmallVector<Expr*, 5> SubExprs;
2730 SubExprs.push_back(Ptr);
2733 // Note, AtomicExpr::getVal1() has a special case for this atomic.
2734 SubExprs.push_back(TheCall->getArg(1)); // Val1
2737 SubExprs.push_back(TheCall->getArg(1)); // Order
2743 SubExprs.push_back(TheCall->getArg(2)); // Order
2744 SubExprs.push_back(TheCall->getArg(1)); // Val1
2747 // Note, AtomicExpr::getVal2() has a special case for this atomic.
2748 SubExprs.push_back(TheCall->getArg(3)); // Order
2749 SubExprs.push_back(TheCall->getArg(1)); // Val1
2750 SubExprs.push_back(TheCall->getArg(2)); // Val2
2753 SubExprs.push_back(TheCall->getArg(3)); // Order
2754 SubExprs.push_back(TheCall->getArg(1)); // Val1
2755 SubExprs.push_back(TheCall->getArg(4)); // OrderFail
2756 SubExprs.push_back(TheCall->getArg(2)); // Val2
2759 SubExprs.push_back(TheCall->getArg(4)); // Order
2760 SubExprs.push_back(TheCall->getArg(1)); // Val1
2761 SubExprs.push_back(TheCall->getArg(5)); // OrderFail
2762 SubExprs.push_back(TheCall->getArg(2)); // Val2
2763 SubExprs.push_back(TheCall->getArg(3)); // Weak
2767 if (SubExprs.size() >= 2 && Form != Init) {
2768 llvm::APSInt Result(32);
2769 if (SubExprs[1]->isIntegerConstantExpr(Result, Context) &&
2770 !isValidOrderingForOp(Result.getSExtValue(), Op))
2771 Diag(SubExprs[1]->getLocStart(),
2772 diag::warn_atomic_op_has_invalid_memory_order)
2773 << SubExprs[1]->getSourceRange();
2776 AtomicExpr *AE = new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(),
2777 SubExprs, ResultType, Op,
2778 TheCall->getRParenLoc());
2780 if ((Op == AtomicExpr::AO__c11_atomic_load ||
2781 (Op == AtomicExpr::AO__c11_atomic_store)) &&
2782 Context.AtomicUsesUnsupportedLibcall(AE))
2783 Diag(AE->getLocStart(), diag::err_atomic_load_store_uses_lib) <<
2784 ((Op == AtomicExpr::AO__c11_atomic_load) ? 0 : 1);
2789 /// checkBuiltinArgument - Given a call to a builtin function, perform
2790 /// normal type-checking on the given argument, updating the call in
2791 /// place. This is useful when a builtin function requires custom
2792 /// type-checking for some of its arguments but not necessarily all of
2795 /// Returns true on error.
2796 static bool checkBuiltinArgument(Sema &S, CallExpr *E, unsigned ArgIndex) {
2797 FunctionDecl *Fn = E->getDirectCallee();
2798 assert(Fn && "builtin call without direct callee!");
2800 ParmVarDecl *Param = Fn->getParamDecl(ArgIndex);
2801 InitializedEntity Entity =
2802 InitializedEntity::InitializeParameter(S.Context, Param);
2804 ExprResult Arg = E->getArg(0);
2805 Arg = S.PerformCopyInitialization(Entity, SourceLocation(), Arg);
2806 if (Arg.isInvalid())
2809 E->setArg(ArgIndex, Arg.get());
2813 /// SemaBuiltinAtomicOverloaded - We have a call to a function like
2814 /// __sync_fetch_and_add, which is an overloaded function based on the pointer
2815 /// type of its first argument. The main ActOnCallExpr routines have already
2816 /// promoted the types of arguments because all of these calls are prototyped as
2819 /// This function goes through and does final semantic checking for these
2822 Sema::SemaBuiltinAtomicOverloaded(ExprResult TheCallResult) {
2823 CallExpr *TheCall = (CallExpr *)TheCallResult.get();
2824 DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
2825 FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
2827 // Ensure that we have at least one argument to do type inference from.
2828 if (TheCall->getNumArgs() < 1) {
2829 Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args_at_least)
2830 << 0 << 1 << TheCall->getNumArgs()
2831 << TheCall->getCallee()->getSourceRange();
2835 // Inspect the first argument of the atomic builtin. This should always be
2836 // a pointer type, whose element is an integral scalar or pointer type.
2837 // Because it is a pointer type, we don't have to worry about any implicit
2839 // FIXME: We don't allow floating point scalars as input.
2840 Expr *FirstArg = TheCall->getArg(0);
2841 ExprResult FirstArgResult = DefaultFunctionArrayLvalueConversion(FirstArg);
2842 if (FirstArgResult.isInvalid())
2844 FirstArg = FirstArgResult.get();
2845 TheCall->setArg(0, FirstArg);
2847 const PointerType *pointerType = FirstArg->getType()->getAs<PointerType>();
2849 Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer)
2850 << FirstArg->getType() << FirstArg->getSourceRange();
2854 QualType ValType = pointerType->getPointeeType();
2855 if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
2856 !ValType->isBlockPointerType()) {
2857 Diag(DRE->getLocStart(), diag::err_atomic_builtin_must_be_pointer_intptr)
2858 << FirstArg->getType() << FirstArg->getSourceRange();
2862 switch (ValType.getObjCLifetime()) {
2863 case Qualifiers::OCL_None:
2864 case Qualifiers::OCL_ExplicitNone:
2868 case Qualifiers::OCL_Weak:
2869 case Qualifiers::OCL_Strong:
2870 case Qualifiers::OCL_Autoreleasing:
2871 Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership)
2872 << ValType << FirstArg->getSourceRange();
2876 // Strip any qualifiers off ValType.
2877 ValType = ValType.getUnqualifiedType();
2879 // The majority of builtins return a value, but a few have special return
2880 // types, so allow them to override appropriately below.
2881 QualType ResultType = ValType;
2883 // We need to figure out which concrete builtin this maps onto. For example,
2884 // __sync_fetch_and_add with a 2 byte object turns into
2885 // __sync_fetch_and_add_2.
2886 #define BUILTIN_ROW(x) \
2887 { Builtin::BI##x##_1, Builtin::BI##x##_2, Builtin::BI##x##_4, \
2888 Builtin::BI##x##_8, Builtin::BI##x##_16 }
2890 static const unsigned BuiltinIndices[][5] = {
2891 BUILTIN_ROW(__sync_fetch_and_add),
2892 BUILTIN_ROW(__sync_fetch_and_sub),
2893 BUILTIN_ROW(__sync_fetch_and_or),
2894 BUILTIN_ROW(__sync_fetch_and_and),
2895 BUILTIN_ROW(__sync_fetch_and_xor),
2896 BUILTIN_ROW(__sync_fetch_and_nand),
2898 BUILTIN_ROW(__sync_add_and_fetch),
2899 BUILTIN_ROW(__sync_sub_and_fetch),
2900 BUILTIN_ROW(__sync_and_and_fetch),
2901 BUILTIN_ROW(__sync_or_and_fetch),
2902 BUILTIN_ROW(__sync_xor_and_fetch),
2903 BUILTIN_ROW(__sync_nand_and_fetch),
2905 BUILTIN_ROW(__sync_val_compare_and_swap),
2906 BUILTIN_ROW(__sync_bool_compare_and_swap),
2907 BUILTIN_ROW(__sync_lock_test_and_set),
2908 BUILTIN_ROW(__sync_lock_release),
2909 BUILTIN_ROW(__sync_swap)
2913 // Determine the index of the size.
2915 switch (Context.getTypeSizeInChars(ValType).getQuantity()) {
2916 case 1: SizeIndex = 0; break;
2917 case 2: SizeIndex = 1; break;
2918 case 4: SizeIndex = 2; break;
2919 case 8: SizeIndex = 3; break;
2920 case 16: SizeIndex = 4; break;
2922 Diag(DRE->getLocStart(), diag::err_atomic_builtin_pointer_size)
2923 << FirstArg->getType() << FirstArg->getSourceRange();
2927 // Each of these builtins has one pointer argument, followed by some number of
2928 // values (0, 1 or 2) followed by a potentially empty varags list of stuff
2929 // that we ignore. Find out which row of BuiltinIndices to read from as well
2930 // as the number of fixed args.
2931 unsigned BuiltinID = FDecl->getBuiltinID();
2932 unsigned BuiltinIndex, NumFixed = 1;
2933 bool WarnAboutSemanticsChange = false;
2934 switch (BuiltinID) {
2935 default: llvm_unreachable("Unknown overloaded atomic builtin!");
2936 case Builtin::BI__sync_fetch_and_add:
2937 case Builtin::BI__sync_fetch_and_add_1:
2938 case Builtin::BI__sync_fetch_and_add_2:
2939 case Builtin::BI__sync_fetch_and_add_4:
2940 case Builtin::BI__sync_fetch_and_add_8:
2941 case Builtin::BI__sync_fetch_and_add_16:
2945 case Builtin::BI__sync_fetch_and_sub:
2946 case Builtin::BI__sync_fetch_and_sub_1:
2947 case Builtin::BI__sync_fetch_and_sub_2:
2948 case Builtin::BI__sync_fetch_and_sub_4:
2949 case Builtin::BI__sync_fetch_and_sub_8:
2950 case Builtin::BI__sync_fetch_and_sub_16:
2954 case Builtin::BI__sync_fetch_and_or:
2955 case Builtin::BI__sync_fetch_and_or_1:
2956 case Builtin::BI__sync_fetch_and_or_2:
2957 case Builtin::BI__sync_fetch_and_or_4:
2958 case Builtin::BI__sync_fetch_and_or_8:
2959 case Builtin::BI__sync_fetch_and_or_16:
2963 case Builtin::BI__sync_fetch_and_and:
2964 case Builtin::BI__sync_fetch_and_and_1:
2965 case Builtin::BI__sync_fetch_and_and_2:
2966 case Builtin::BI__sync_fetch_and_and_4:
2967 case Builtin::BI__sync_fetch_and_and_8:
2968 case Builtin::BI__sync_fetch_and_and_16:
2972 case Builtin::BI__sync_fetch_and_xor:
2973 case Builtin::BI__sync_fetch_and_xor_1:
2974 case Builtin::BI__sync_fetch_and_xor_2:
2975 case Builtin::BI__sync_fetch_and_xor_4:
2976 case Builtin::BI__sync_fetch_and_xor_8:
2977 case Builtin::BI__sync_fetch_and_xor_16:
2981 case Builtin::BI__sync_fetch_and_nand:
2982 case Builtin::BI__sync_fetch_and_nand_1:
2983 case Builtin::BI__sync_fetch_and_nand_2:
2984 case Builtin::BI__sync_fetch_and_nand_4:
2985 case Builtin::BI__sync_fetch_and_nand_8:
2986 case Builtin::BI__sync_fetch_and_nand_16:
2988 WarnAboutSemanticsChange = true;
2991 case Builtin::BI__sync_add_and_fetch:
2992 case Builtin::BI__sync_add_and_fetch_1:
2993 case Builtin::BI__sync_add_and_fetch_2:
2994 case Builtin::BI__sync_add_and_fetch_4:
2995 case Builtin::BI__sync_add_and_fetch_8:
2996 case Builtin::BI__sync_add_and_fetch_16:
3000 case Builtin::BI__sync_sub_and_fetch:
3001 case Builtin::BI__sync_sub_and_fetch_1:
3002 case Builtin::BI__sync_sub_and_fetch_2:
3003 case Builtin::BI__sync_sub_and_fetch_4:
3004 case Builtin::BI__sync_sub_and_fetch_8:
3005 case Builtin::BI__sync_sub_and_fetch_16:
3009 case Builtin::BI__sync_and_and_fetch:
3010 case Builtin::BI__sync_and_and_fetch_1:
3011 case Builtin::BI__sync_and_and_fetch_2:
3012 case Builtin::BI__sync_and_and_fetch_4:
3013 case Builtin::BI__sync_and_and_fetch_8:
3014 case Builtin::BI__sync_and_and_fetch_16:
3018 case Builtin::BI__sync_or_and_fetch:
3019 case Builtin::BI__sync_or_and_fetch_1:
3020 case Builtin::BI__sync_or_and_fetch_2:
3021 case Builtin::BI__sync_or_and_fetch_4:
3022 case Builtin::BI__sync_or_and_fetch_8:
3023 case Builtin::BI__sync_or_and_fetch_16:
3027 case Builtin::BI__sync_xor_and_fetch:
3028 case Builtin::BI__sync_xor_and_fetch_1:
3029 case Builtin::BI__sync_xor_and_fetch_2:
3030 case Builtin::BI__sync_xor_and_fetch_4:
3031 case Builtin::BI__sync_xor_and_fetch_8:
3032 case Builtin::BI__sync_xor_and_fetch_16:
3036 case Builtin::BI__sync_nand_and_fetch:
3037 case Builtin::BI__sync_nand_and_fetch_1:
3038 case Builtin::BI__sync_nand_and_fetch_2:
3039 case Builtin::BI__sync_nand_and_fetch_4:
3040 case Builtin::BI__sync_nand_and_fetch_8:
3041 case Builtin::BI__sync_nand_and_fetch_16:
3043 WarnAboutSemanticsChange = true;
3046 case Builtin::BI__sync_val_compare_and_swap:
3047 case Builtin::BI__sync_val_compare_and_swap_1:
3048 case Builtin::BI__sync_val_compare_and_swap_2:
3049 case Builtin::BI__sync_val_compare_and_swap_4:
3050 case Builtin::BI__sync_val_compare_and_swap_8:
3051 case Builtin::BI__sync_val_compare_and_swap_16:
3056 case Builtin::BI__sync_bool_compare_and_swap:
3057 case Builtin::BI__sync_bool_compare_and_swap_1:
3058 case Builtin::BI__sync_bool_compare_and_swap_2:
3059 case Builtin::BI__sync_bool_compare_and_swap_4:
3060 case Builtin::BI__sync_bool_compare_and_swap_8:
3061 case Builtin::BI__sync_bool_compare_and_swap_16:
3064 ResultType = Context.BoolTy;
3067 case Builtin::BI__sync_lock_test_and_set:
3068 case Builtin::BI__sync_lock_test_and_set_1:
3069 case Builtin::BI__sync_lock_test_and_set_2:
3070 case Builtin::BI__sync_lock_test_and_set_4:
3071 case Builtin::BI__sync_lock_test_and_set_8:
3072 case Builtin::BI__sync_lock_test_and_set_16:
3076 case Builtin::BI__sync_lock_release:
3077 case Builtin::BI__sync_lock_release_1:
3078 case Builtin::BI__sync_lock_release_2:
3079 case Builtin::BI__sync_lock_release_4:
3080 case Builtin::BI__sync_lock_release_8:
3081 case Builtin::BI__sync_lock_release_16:
3084 ResultType = Context.VoidTy;
3087 case Builtin::BI__sync_swap:
3088 case Builtin::BI__sync_swap_1:
3089 case Builtin::BI__sync_swap_2:
3090 case Builtin::BI__sync_swap_4:
3091 case Builtin::BI__sync_swap_8:
3092 case Builtin::BI__sync_swap_16:
3097 // Now that we know how many fixed arguments we expect, first check that we
3098 // have at least that many.
3099 if (TheCall->getNumArgs() < 1+NumFixed) {
3100 Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args_at_least)
3101 << 0 << 1+NumFixed << TheCall->getNumArgs()
3102 << TheCall->getCallee()->getSourceRange();
3106 if (WarnAboutSemanticsChange) {
3107 Diag(TheCall->getLocEnd(), diag::warn_sync_fetch_and_nand_semantics_change)
3108 << TheCall->getCallee()->getSourceRange();
3111 // Get the decl for the concrete builtin from this, we can tell what the
3112 // concrete integer type we should convert to is.
3113 unsigned NewBuiltinID = BuiltinIndices[BuiltinIndex][SizeIndex];
3114 const char *NewBuiltinName = Context.BuiltinInfo.getName(NewBuiltinID);
3115 FunctionDecl *NewBuiltinDecl;
3116 if (NewBuiltinID == BuiltinID)
3117 NewBuiltinDecl = FDecl;
3119 // Perform builtin lookup to avoid redeclaring it.
3120 DeclarationName DN(&Context.Idents.get(NewBuiltinName));
3121 LookupResult Res(*this, DN, DRE->getLocStart(), LookupOrdinaryName);
3122 LookupName(Res, TUScope, /*AllowBuiltinCreation=*/true);
3123 assert(Res.getFoundDecl());
3124 NewBuiltinDecl = dyn_cast<FunctionDecl>(Res.getFoundDecl());
3125 if (!NewBuiltinDecl)
3129 // The first argument --- the pointer --- has a fixed type; we
3130 // deduce the types of the rest of the arguments accordingly. Walk
3131 // the remaining arguments, converting them to the deduced value type.
3132 for (unsigned i = 0; i != NumFixed; ++i) {
3133 ExprResult Arg = TheCall->getArg(i+1);
3135 // GCC does an implicit conversion to the pointer or integer ValType. This
3136 // can fail in some cases (1i -> int**), check for this error case now.
3137 // Initialize the argument.
3138 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
3139 ValType, /*consume*/ false);
3140 Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
3141 if (Arg.isInvalid())
3144 // Okay, we have something that *can* be converted to the right type. Check
3145 // to see if there is a potentially weird extension going on here. This can
3146 // happen when you do an atomic operation on something like an char* and
3147 // pass in 42. The 42 gets converted to char. This is even more strange
3148 // for things like 45.123 -> char, etc.
3149 // FIXME: Do this check.
3150 TheCall->setArg(i+1, Arg.get());
3153 ASTContext& Context = this->getASTContext();
3155 // Create a new DeclRefExpr to refer to the new decl.
3156 DeclRefExpr* NewDRE = DeclRefExpr::Create(
3158 DRE->getQualifierLoc(),
3161 /*enclosing*/ false,
3163 Context.BuiltinFnTy,
3164 DRE->getValueKind());
3166 // Set the callee in the CallExpr.
3167 // FIXME: This loses syntactic information.
3168 QualType CalleePtrTy = Context.getPointerType(NewBuiltinDecl->getType());
3169 ExprResult PromotedCall = ImpCastExprToType(NewDRE, CalleePtrTy,
3170 CK_BuiltinFnToFnPtr);
3171 TheCall->setCallee(PromotedCall.get());
3173 // Change the result type of the call to match the original value type. This
3174 // is arbitrary, but the codegen for these builtins ins design to handle it
3176 TheCall->setType(ResultType);
3178 return TheCallResult;
3181 /// SemaBuiltinNontemporalOverloaded - We have a call to
3182 /// __builtin_nontemporal_store or __builtin_nontemporal_load, which is an
3183 /// overloaded function based on the pointer type of its last argument.
3185 /// This function goes through and does final semantic checking for these
3187 ExprResult Sema::SemaBuiltinNontemporalOverloaded(ExprResult TheCallResult) {
3188 CallExpr *TheCall = (CallExpr *)TheCallResult.get();
3190 cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
3191 FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
3192 unsigned BuiltinID = FDecl->getBuiltinID();
3193 assert((BuiltinID == Builtin::BI__builtin_nontemporal_store ||
3194 BuiltinID == Builtin::BI__builtin_nontemporal_load) &&
3195 "Unexpected nontemporal load/store builtin!");
3196 bool isStore = BuiltinID == Builtin::BI__builtin_nontemporal_store;
3197 unsigned numArgs = isStore ? 2 : 1;
3199 // Ensure that we have the proper number of arguments.
3200 if (checkArgCount(*this, TheCall, numArgs))
3203 // Inspect the last argument of the nontemporal builtin. This should always
3204 // be a pointer type, from which we imply the type of the memory access.
3205 // Because it is a pointer type, we don't have to worry about any implicit
3207 Expr *PointerArg = TheCall->getArg(numArgs - 1);
3208 ExprResult PointerArgResult =
3209 DefaultFunctionArrayLvalueConversion(PointerArg);
3211 if (PointerArgResult.isInvalid())
3213 PointerArg = PointerArgResult.get();
3214 TheCall->setArg(numArgs - 1, PointerArg);
3216 const PointerType *pointerType = PointerArg->getType()->getAs<PointerType>();
3218 Diag(DRE->getLocStart(), diag::err_nontemporal_builtin_must_be_pointer)
3219 << PointerArg->getType() << PointerArg->getSourceRange();
3223 QualType ValType = pointerType->getPointeeType();
3225 // Strip any qualifiers off ValType.
3226 ValType = ValType.getUnqualifiedType();
3227 if (!ValType->isIntegerType() && !ValType->isAnyPointerType() &&
3228 !ValType->isBlockPointerType() && !ValType->isFloatingType() &&
3229 !ValType->isVectorType()) {
3230 Diag(DRE->getLocStart(),
3231 diag::err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector)
3232 << PointerArg->getType() << PointerArg->getSourceRange();
3237 TheCall->setType(ValType);
3238 return TheCallResult;
3241 ExprResult ValArg = TheCall->getArg(0);
3242 InitializedEntity Entity = InitializedEntity::InitializeParameter(
3243 Context, ValType, /*consume*/ false);
3244 ValArg = PerformCopyInitialization(Entity, SourceLocation(), ValArg);
3245 if (ValArg.isInvalid())
3248 TheCall->setArg(0, ValArg.get());
3249 TheCall->setType(Context.VoidTy);
3250 return TheCallResult;
3253 /// CheckObjCString - Checks that the argument to the builtin
3254 /// CFString constructor is correct
3255 /// Note: It might also make sense to do the UTF-16 conversion here (would
3256 /// simplify the backend).
3257 bool Sema::CheckObjCString(Expr *Arg) {
3258 Arg = Arg->IgnoreParenCasts();
3259 StringLiteral *Literal = dyn_cast<StringLiteral>(Arg);
3261 if (!Literal || !Literal->isAscii()) {
3262 Diag(Arg->getLocStart(), diag::err_cfstring_literal_not_string_constant)
3263 << Arg->getSourceRange();
3267 if (Literal->containsNonAsciiOrNull()) {
3268 StringRef String = Literal->getString();
3269 unsigned NumBytes = String.size();
3270 SmallVector<UTF16, 128> ToBuf(NumBytes);
3271 const UTF8 *FromPtr = (const UTF8 *)String.data();
3272 UTF16 *ToPtr = &ToBuf[0];
3274 ConversionResult Result = ConvertUTF8toUTF16(&FromPtr, FromPtr + NumBytes,
3275 &ToPtr, ToPtr + NumBytes,
3277 // Check for conversion failure.
3278 if (Result != conversionOK)
3279 Diag(Arg->getLocStart(),
3280 diag::warn_cfstring_truncated) << Arg->getSourceRange();
3285 /// Check the arguments to '__builtin_va_start' or '__builtin_ms_va_start'
3286 /// for validity. Emit an error and return true on failure; return false
3288 bool Sema::SemaBuiltinVAStartImpl(CallExpr *TheCall) {
3289 Expr *Fn = TheCall->getCallee();
3290 if (TheCall->getNumArgs() > 2) {
3291 Diag(TheCall->getArg(2)->getLocStart(),
3292 diag::err_typecheck_call_too_many_args)
3293 << 0 /*function call*/ << 2 << TheCall->getNumArgs()
3294 << Fn->getSourceRange()
3295 << SourceRange(TheCall->getArg(2)->getLocStart(),
3296 (*(TheCall->arg_end()-1))->getLocEnd());
3300 if (TheCall->getNumArgs() < 2) {
3301 return Diag(TheCall->getLocEnd(),
3302 diag::err_typecheck_call_too_few_args_at_least)
3303 << 0 /*function call*/ << 2 << TheCall->getNumArgs();
3306 // Type-check the first argument normally.
3307 if (checkBuiltinArgument(*this, TheCall, 0))
3310 // Determine whether the current function is variadic or not.
3311 BlockScopeInfo *CurBlock = getCurBlock();
3314 isVariadic = CurBlock->TheDecl->isVariadic();
3315 else if (FunctionDecl *FD = getCurFunctionDecl())
3316 isVariadic = FD->isVariadic();
3318 isVariadic = getCurMethodDecl()->isVariadic();
3321 Diag(Fn->getLocStart(), diag::err_va_start_used_in_non_variadic_function);
3325 // Verify that the second argument to the builtin is the last argument of the
3326 // current function or method.
3327 bool SecondArgIsLastNamedArgument = false;
3328 const Expr *Arg = TheCall->getArg(1)->IgnoreParenCasts();
3330 // These are valid if SecondArgIsLastNamedArgument is false after the next
3333 SourceLocation ParamLoc;
3334 bool IsCRegister = false;
3336 if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Arg)) {
3337 if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(DR->getDecl())) {
3338 // FIXME: This isn't correct for methods (results in bogus warning).
3339 // Get the last formal in the current function.
3340 const ParmVarDecl *LastArg;
3342 LastArg = CurBlock->TheDecl->parameters().back();
3343 else if (FunctionDecl *FD = getCurFunctionDecl())
3344 LastArg = FD->parameters().back();
3346 LastArg = getCurMethodDecl()->parameters().back();
3347 SecondArgIsLastNamedArgument = PV == LastArg;
3349 Type = PV->getType();
3350 ParamLoc = PV->getLocation();
3352 PV->getStorageClass() == SC_Register && !getLangOpts().CPlusPlus;
3356 if (!SecondArgIsLastNamedArgument)
3357 Diag(TheCall->getArg(1)->getLocStart(),
3358 diag::warn_second_arg_of_va_start_not_last_named_param);
3359 else if (IsCRegister || Type->isReferenceType() ||
3360 Type->isSpecificBuiltinType(BuiltinType::Float) || [=] {
3361 // Promotable integers are UB, but enumerations need a bit of
3362 // extra checking to see what their promotable type actually is.
3363 if (!Type->isPromotableIntegerType())
3365 if (!Type->isEnumeralType())
3367 const EnumDecl *ED = Type->getAs<EnumType>()->getDecl();
3369 Context.typesAreCompatible(ED->getPromotionType(), Type));
3371 unsigned Reason = 0;
3372 if (Type->isReferenceType()) Reason = 1;
3373 else if (IsCRegister) Reason = 2;
3374 Diag(Arg->getLocStart(), diag::warn_va_start_type_is_undefined) << Reason;
3375 Diag(ParamLoc, diag::note_parameter_type) << Type;
3378 TheCall->setType(Context.VoidTy);
3382 /// Check the arguments to '__builtin_va_start' for validity, and that
3383 /// it was called from a function of the native ABI.
3384 /// Emit an error and return true on failure; return false on success.
3385 bool Sema::SemaBuiltinVAStart(CallExpr *TheCall) {
3386 // On x86-64 Unix, don't allow this in Win64 ABI functions.
3387 // On x64 Windows, don't allow this in System V ABI functions.
3388 // (Yes, that means there's no corresponding way to support variadic
3389 // System V ABI functions on Windows.)
3390 if (Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86_64) {
3391 unsigned OS = Context.getTargetInfo().getTriple().getOS();
3392 clang::CallingConv CC = CC_C;
3393 if (const FunctionDecl *FD = getCurFunctionDecl())
3394 CC = FD->getType()->getAs<FunctionType>()->getCallConv();
3395 if ((OS == llvm::Triple::Win32 && CC == CC_X86_64SysV) ||
3396 (OS != llvm::Triple::Win32 && CC == CC_X86_64Win64))
3397 return Diag(TheCall->getCallee()->getLocStart(),
3398 diag::err_va_start_used_in_wrong_abi_function)
3399 << (OS != llvm::Triple::Win32);
3401 return SemaBuiltinVAStartImpl(TheCall);
3404 /// Check the arguments to '__builtin_ms_va_start' for validity, and that
3405 /// it was called from a Win64 ABI function.
3406 /// Emit an error and return true on failure; return false on success.
3407 bool Sema::SemaBuiltinMSVAStart(CallExpr *TheCall) {
3408 // This only makes sense for x86-64.
3409 const llvm::Triple &TT = Context.getTargetInfo().getTriple();
3410 Expr *Callee = TheCall->getCallee();
3411 if (TT.getArch() != llvm::Triple::x86_64)
3412 return Diag(Callee->getLocStart(), diag::err_x86_builtin_32_bit_tgt);
3413 // Don't allow this in System V ABI functions.
3414 clang::CallingConv CC = CC_C;
3415 if (const FunctionDecl *FD = getCurFunctionDecl())
3416 CC = FD->getType()->getAs<FunctionType>()->getCallConv();
3417 if (CC == CC_X86_64SysV ||
3418 (TT.getOS() != llvm::Triple::Win32 && CC != CC_X86_64Win64))
3419 return Diag(Callee->getLocStart(),
3420 diag::err_ms_va_start_used_in_sysv_function);
3421 return SemaBuiltinVAStartImpl(TheCall);
3424 bool Sema::SemaBuiltinVAStartARM(CallExpr *Call) {
3425 // void __va_start(va_list *ap, const char *named_addr, size_t slot_size,
3426 // const char *named_addr);
3428 Expr *Func = Call->getCallee();
3430 if (Call->getNumArgs() < 3)
3431 return Diag(Call->getLocEnd(),
3432 diag::err_typecheck_call_too_few_args_at_least)
3433 << 0 /*function call*/ << 3 << Call->getNumArgs();
3435 // Determine whether the current function is variadic or not.
3437 if (BlockScopeInfo *CurBlock = getCurBlock())
3438 IsVariadic = CurBlock->TheDecl->isVariadic();
3439 else if (FunctionDecl *FD = getCurFunctionDecl())
3440 IsVariadic = FD->isVariadic();
3441 else if (ObjCMethodDecl *MD = getCurMethodDecl())
3442 IsVariadic = MD->isVariadic();
3444 llvm_unreachable("unexpected statement type");
3447 Diag(Func->getLocStart(), diag::err_va_start_used_in_non_variadic_function);
3451 // Type-check the first argument normally.
3452 if (checkBuiltinArgument(*this, Call, 0))
3458 } ArgumentTypes[] = {
3459 { 1, Context.getPointerType(Context.CharTy.withConst()) },
3460 { 2, Context.getSizeType() },
3463 for (const auto &AT : ArgumentTypes) {
3464 const Expr *Arg = Call->getArg(AT.ArgNo)->IgnoreParens();
3465 if (Arg->getType().getCanonicalType() == AT.Type.getCanonicalType())
3467 Diag(Arg->getLocStart(), diag::err_typecheck_convert_incompatible)
3468 << Arg->getType() << AT.Type << 1 /* different class */
3469 << 0 /* qualifier difference */ << 3 /* parameter mismatch */
3470 << AT.ArgNo + 1 << Arg->getType() << AT.Type;
3476 /// SemaBuiltinUnorderedCompare - Handle functions like __builtin_isgreater and
3477 /// friends. This is declared to take (...), so we have to check everything.
3478 bool Sema::SemaBuiltinUnorderedCompare(CallExpr *TheCall) {
3479 if (TheCall->getNumArgs() < 2)
3480 return Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args)
3481 << 0 << 2 << TheCall->getNumArgs()/*function call*/;
3482 if (TheCall->getNumArgs() > 2)
3483 return Diag(TheCall->getArg(2)->getLocStart(),
3484 diag::err_typecheck_call_too_many_args)
3485 << 0 /*function call*/ << 2 << TheCall->getNumArgs()
3486 << SourceRange(TheCall->getArg(2)->getLocStart(),
3487 (*(TheCall->arg_end()-1))->getLocEnd());
3489 ExprResult OrigArg0 = TheCall->getArg(0);
3490 ExprResult OrigArg1 = TheCall->getArg(1);
3492 // Do standard promotions between the two arguments, returning their common
3494 QualType Res = UsualArithmeticConversions(OrigArg0, OrigArg1, false);
3495 if (OrigArg0.isInvalid() || OrigArg1.isInvalid())
3498 // Make sure any conversions are pushed back into the call; this is
3499 // type safe since unordered compare builtins are declared as "_Bool
3501 TheCall->setArg(0, OrigArg0.get());
3502 TheCall->setArg(1, OrigArg1.get());
3504 if (OrigArg0.get()->isTypeDependent() || OrigArg1.get()->isTypeDependent())
3507 // If the common type isn't a real floating type, then the arguments were
3508 // invalid for this operation.
3509 if (Res.isNull() || !Res->isRealFloatingType())
3510 return Diag(OrigArg0.get()->getLocStart(),
3511 diag::err_typecheck_call_invalid_ordered_compare)
3512 << OrigArg0.get()->getType() << OrigArg1.get()->getType()
3513 << SourceRange(OrigArg0.get()->getLocStart(), OrigArg1.get()->getLocEnd());
3518 /// SemaBuiltinSemaBuiltinFPClassification - Handle functions like
3519 /// __builtin_isnan and friends. This is declared to take (...), so we have
3520 /// to check everything. We expect the last argument to be a floating point
3522 bool Sema::SemaBuiltinFPClassification(CallExpr *TheCall, unsigned NumArgs) {
3523 if (TheCall->getNumArgs() < NumArgs)
3524 return Diag(TheCall->getLocEnd(), diag::err_typecheck_call_too_few_args)
3525 << 0 << NumArgs << TheCall->getNumArgs()/*function call*/;
3526 if (TheCall->getNumArgs() > NumArgs)
3527 return Diag(TheCall->getArg(NumArgs)->getLocStart(),
3528 diag::err_typecheck_call_too_many_args)
3529 << 0 /*function call*/ << NumArgs << TheCall->getNumArgs()
3530 << SourceRange(TheCall->getArg(NumArgs)->getLocStart(),
3531 (*(TheCall->arg_end()-1))->getLocEnd());
3533 Expr *OrigArg = TheCall->getArg(NumArgs-1);
3535 if (OrigArg->isTypeDependent())
3538 // This operation requires a non-_Complex floating-point number.
3539 if (!OrigArg->getType()->isRealFloatingType())
3540 return Diag(OrigArg->getLocStart(),
3541 diag::err_typecheck_call_invalid_unary_fp)
3542 << OrigArg->getType() << OrigArg->getSourceRange();
3544 // If this is an implicit conversion from float -> double, remove it.
3545 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(OrigArg)) {
3546 Expr *CastArg = Cast->getSubExpr();
3547 if (CastArg->getType()->isSpecificBuiltinType(BuiltinType::Float)) {
3548 assert(Cast->getType()->isSpecificBuiltinType(BuiltinType::Double) &&
3549 "promotion from float to double is the only expected cast here");
3550 Cast->setSubExpr(nullptr);
3551 TheCall->setArg(NumArgs-1, CastArg);
3558 /// SemaBuiltinShuffleVector - Handle __builtin_shufflevector.
3559 // This is declared to take (...), so we have to check everything.
3560 ExprResult Sema::SemaBuiltinShuffleVector(CallExpr *TheCall) {
3561 if (TheCall->getNumArgs() < 2)
3562 return ExprError(Diag(TheCall->getLocEnd(),
3563 diag::err_typecheck_call_too_few_args_at_least)
3564 << 0 /*function call*/ << 2 << TheCall->getNumArgs()
3565 << TheCall->getSourceRange());
3567 // Determine which of the following types of shufflevector we're checking:
3568 // 1) unary, vector mask: (lhs, mask)
3569 // 2) binary, scalar mask: (lhs, rhs, index, ..., index)
3570 QualType resType = TheCall->getArg(0)->getType();
3571 unsigned numElements = 0;
3573 if (!TheCall->getArg(0)->isTypeDependent() &&
3574 !TheCall->getArg(1)->isTypeDependent()) {
3575 QualType LHSType = TheCall->getArg(0)->getType();
3576 QualType RHSType = TheCall->getArg(1)->getType();
3578 if (!LHSType->isVectorType() || !RHSType->isVectorType())
3579 return ExprError(Diag(TheCall->getLocStart(),
3580 diag::err_shufflevector_non_vector)
3581 << SourceRange(TheCall->getArg(0)->getLocStart(),
3582 TheCall->getArg(1)->getLocEnd()));
3584 numElements = LHSType->getAs<VectorType>()->getNumElements();
3585 unsigned numResElements = TheCall->getNumArgs() - 2;
3587 // Check to see if we have a call with 2 vector arguments, the unary shuffle
3588 // with mask. If so, verify that RHS is an integer vector type with the
3589 // same number of elts as lhs.
3590 if (TheCall->getNumArgs() == 2) {
3591 if (!RHSType->hasIntegerRepresentation() ||
3592 RHSType->getAs<VectorType>()->getNumElements() != numElements)
3593 return ExprError(Diag(TheCall->getLocStart(),
3594 diag::err_shufflevector_incompatible_vector)
3595 << SourceRange(TheCall->getArg(1)->getLocStart(),
3596 TheCall->getArg(1)->getLocEnd()));
3597 } else if (!Context.hasSameUnqualifiedType(LHSType, RHSType)) {
3598 return ExprError(Diag(TheCall->getLocStart(),
3599 diag::err_shufflevector_incompatible_vector)
3600 << SourceRange(TheCall->getArg(0)->getLocStart(),
3601 TheCall->getArg(1)->getLocEnd()));
3602 } else if (numElements != numResElements) {
3603 QualType eltType = LHSType->getAs<VectorType>()->getElementType();
3604 resType = Context.getVectorType(eltType, numResElements,
3605 VectorType::GenericVector);
3609 for (unsigned i = 2; i < TheCall->getNumArgs(); i++) {
3610 if (TheCall->getArg(i)->isTypeDependent() ||
3611 TheCall->getArg(i)->isValueDependent())
3614 llvm::APSInt Result(32);
3615 if (!TheCall->getArg(i)->isIntegerConstantExpr(Result, Context))
3616 return ExprError(Diag(TheCall->getLocStart(),
3617 diag::err_shufflevector_nonconstant_argument)
3618 << TheCall->getArg(i)->getSourceRange());
3620 // Allow -1 which will be translated to undef in the IR.
3621 if (Result.isSigned() && Result.isAllOnesValue())
3624 if (Result.getActiveBits() > 64 || Result.getZExtValue() >= numElements*2)
3625 return ExprError(Diag(TheCall->getLocStart(),
3626 diag::err_shufflevector_argument_too_large)
3627 << TheCall->getArg(i)->getSourceRange());
3630 SmallVector<Expr*, 32> exprs;
3632 for (unsigned i = 0, e = TheCall->getNumArgs(); i != e; i++) {
3633 exprs.push_back(TheCall->getArg(i));
3634 TheCall->setArg(i, nullptr);
3637 return new (Context) ShuffleVectorExpr(Context, exprs, resType,
3638 TheCall->getCallee()->getLocStart(),
3639 TheCall->getRParenLoc());
3642 /// SemaConvertVectorExpr - Handle __builtin_convertvector
3643 ExprResult Sema::SemaConvertVectorExpr(Expr *E, TypeSourceInfo *TInfo,
3644 SourceLocation BuiltinLoc,
3645 SourceLocation RParenLoc) {
3646 ExprValueKind VK = VK_RValue;
3647 ExprObjectKind OK = OK_Ordinary;
3648 QualType DstTy = TInfo->getType();
3649 QualType SrcTy = E->getType();
3651 if (!SrcTy->isVectorType() && !SrcTy->isDependentType())
3652 return ExprError(Diag(BuiltinLoc,
3653 diag::err_convertvector_non_vector)
3654 << E->getSourceRange());
3655 if (!DstTy->isVectorType() && !DstTy->isDependentType())
3656 return ExprError(Diag(BuiltinLoc,
3657 diag::err_convertvector_non_vector_type));
3659 if (!SrcTy->isDependentType() && !DstTy->isDependentType()) {
3660 unsigned SrcElts = SrcTy->getAs<VectorType>()->getNumElements();
3661 unsigned DstElts = DstTy->getAs<VectorType>()->getNumElements();
3662 if (SrcElts != DstElts)
3663 return ExprError(Diag(BuiltinLoc,
3664 diag::err_convertvector_incompatible_vector)
3665 << E->getSourceRange());
3668 return new (Context)
3669 ConvertVectorExpr(E, TInfo, DstTy, VK, OK, BuiltinLoc, RParenLoc);
3672 /// SemaBuiltinPrefetch - Handle __builtin_prefetch.
3673 // This is declared to take (const void*, ...) and can take two
3674 // optional constant int args.
3675 bool Sema::SemaBuiltinPrefetch(CallExpr *TheCall) {
3676 unsigned NumArgs = TheCall->getNumArgs();
3679 return Diag(TheCall->getLocEnd(),
3680 diag::err_typecheck_call_too_many_args_at_most)
3681 << 0 /*function call*/ << 3 << NumArgs
3682 << TheCall->getSourceRange();
3684 // Argument 0 is checked for us and the remaining arguments must be
3685 // constant integers.
3686 for (unsigned i = 1; i != NumArgs; ++i)
3687 if (SemaBuiltinConstantArgRange(TheCall, i, 0, i == 1 ? 1 : 3))
3693 /// SemaBuiltinAssume - Handle __assume (MS Extension).
3694 // __assume does not evaluate its arguments, and should warn if its argument
3695 // has side effects.
3696 bool Sema::SemaBuiltinAssume(CallExpr *TheCall) {
3697 Expr *Arg = TheCall->getArg(0);
3698 if (Arg->isInstantiationDependent()) return false;
3700 if (Arg->HasSideEffects(Context))
3701 Diag(Arg->getLocStart(), diag::warn_assume_side_effects)
3702 << Arg->getSourceRange()
3703 << cast<FunctionDecl>(TheCall->getCalleeDecl())->getIdentifier();
3708 /// Handle __builtin_assume_aligned. This is declared
3709 /// as (const void*, size_t, ...) and can take one optional constant int arg.
3710 bool Sema::SemaBuiltinAssumeAligned(CallExpr *TheCall) {
3711 unsigned NumArgs = TheCall->getNumArgs();
3714 return Diag(TheCall->getLocEnd(),
3715 diag::err_typecheck_call_too_many_args_at_most)
3716 << 0 /*function call*/ << 3 << NumArgs
3717 << TheCall->getSourceRange();
3719 // The alignment must be a constant integer.
3720 Expr *Arg = TheCall->getArg(1);
3722 // We can't check the value of a dependent argument.
3723 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) {
3724 llvm::APSInt Result;
3725 if (SemaBuiltinConstantArg(TheCall, 1, Result))
3728 if (!Result.isPowerOf2())
3729 return Diag(TheCall->getLocStart(),
3730 diag::err_alignment_not_power_of_two)
3731 << Arg->getSourceRange();
3735 ExprResult Arg(TheCall->getArg(2));
3736 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
3737 Context.getSizeType(), false);
3738 Arg = PerformCopyInitialization(Entity, SourceLocation(), Arg);
3739 if (Arg.isInvalid()) return true;
3740 TheCall->setArg(2, Arg.get());
3746 /// SemaBuiltinConstantArg - Handle a check if argument ArgNum of CallExpr
3747 /// TheCall is a constant expression.
3748 bool Sema::SemaBuiltinConstantArg(CallExpr *TheCall, int ArgNum,
3749 llvm::APSInt &Result) {
3750 Expr *Arg = TheCall->getArg(ArgNum);
3751 DeclRefExpr *DRE =cast<DeclRefExpr>(TheCall->getCallee()->IgnoreParenCasts());
3752 FunctionDecl *FDecl = cast<FunctionDecl>(DRE->getDecl());
3754 if (Arg->isTypeDependent() || Arg->isValueDependent()) return false;
3756 if (!Arg->isIntegerConstantExpr(Result, Context))
3757 return Diag(TheCall->getLocStart(), diag::err_constant_integer_arg_type)
3758 << FDecl->getDeclName() << Arg->getSourceRange();
3763 /// SemaBuiltinConstantArgRange - Handle a check if argument ArgNum of CallExpr
3764 /// TheCall is a constant expression in the range [Low, High].
3765 bool Sema::SemaBuiltinConstantArgRange(CallExpr *TheCall, int ArgNum,
3766 int Low, int High) {
3767 llvm::APSInt Result;
3769 // We can't check the value of a dependent argument.
3770 Expr *Arg = TheCall->getArg(ArgNum);
3771 if (Arg->isTypeDependent() || Arg->isValueDependent())
3774 // Check constant-ness first.
3775 if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
3778 if (Result.getSExtValue() < Low || Result.getSExtValue() > High)
3779 return Diag(TheCall->getLocStart(), diag::err_argument_invalid_range)
3780 << Low << High << Arg->getSourceRange();
3785 /// SemaBuiltinConstantArgMultiple - Handle a check if argument ArgNum of CallExpr
3786 /// TheCall is a constant expression is a multiple of Num..
3787 bool Sema::SemaBuiltinConstantArgMultiple(CallExpr *TheCall, int ArgNum,
3789 llvm::APSInt Result;
3791 // We can't check the value of a dependent argument.
3792 Expr *Arg = TheCall->getArg(ArgNum);
3793 if (Arg->isTypeDependent() || Arg->isValueDependent())
3796 // Check constant-ness first.
3797 if (SemaBuiltinConstantArg(TheCall, ArgNum, Result))
3800 if (Result.getSExtValue() % Num != 0)
3801 return Diag(TheCall->getLocStart(), diag::err_argument_not_multiple)
3802 << Num << Arg->getSourceRange();
3807 /// SemaBuiltinARMSpecialReg - Handle a check if argument ArgNum of CallExpr
3808 /// TheCall is an ARM/AArch64 special register string literal.
3809 bool Sema::SemaBuiltinARMSpecialReg(unsigned BuiltinID, CallExpr *TheCall,
3810 int ArgNum, unsigned ExpectedFieldNum,
3812 bool IsARMBuiltin = BuiltinID == ARM::BI__builtin_arm_rsr64 ||
3813 BuiltinID == ARM::BI__builtin_arm_wsr64 ||
3814 BuiltinID == ARM::BI__builtin_arm_rsr ||
3815 BuiltinID == ARM::BI__builtin_arm_rsrp ||
3816 BuiltinID == ARM::BI__builtin_arm_wsr ||
3817 BuiltinID == ARM::BI__builtin_arm_wsrp;
3818 bool IsAArch64Builtin = BuiltinID == AArch64::BI__builtin_arm_rsr64 ||
3819 BuiltinID == AArch64::BI__builtin_arm_wsr64 ||
3820 BuiltinID == AArch64::BI__builtin_arm_rsr ||
3821 BuiltinID == AArch64::BI__builtin_arm_rsrp ||
3822 BuiltinID == AArch64::BI__builtin_arm_wsr ||
3823 BuiltinID == AArch64::BI__builtin_arm_wsrp;
3824 assert((IsARMBuiltin || IsAArch64Builtin) && "Unexpected ARM builtin.");
3826 // We can't check the value of a dependent argument.
3827 Expr *Arg = TheCall->getArg(ArgNum);
3828 if (Arg->isTypeDependent() || Arg->isValueDependent())
3831 // Check if the argument is a string literal.
3832 if (!isa<StringLiteral>(Arg->IgnoreParenImpCasts()))
3833 return Diag(TheCall->getLocStart(), diag::err_expr_not_string_literal)
3834 << Arg->getSourceRange();
3836 // Check the type of special register given.
3837 StringRef Reg = cast<StringLiteral>(Arg->IgnoreParenImpCasts())->getString();
3838 SmallVector<StringRef, 6> Fields;
3839 Reg.split(Fields, ":");
3841 if (Fields.size() != ExpectedFieldNum && !(AllowName && Fields.size() == 1))
3842 return Diag(TheCall->getLocStart(), diag::err_arm_invalid_specialreg)
3843 << Arg->getSourceRange();
3845 // If the string is the name of a register then we cannot check that it is
3846 // valid here but if the string is of one the forms described in ACLE then we
3847 // can check that the supplied fields are integers and within the valid
3849 if (Fields.size() > 1) {
3850 bool FiveFields = Fields.size() == 5;
3852 bool ValidString = true;
3854 ValidString &= Fields[0].startswith_lower("cp") ||
3855 Fields[0].startswith_lower("p");
3858 Fields[0].drop_front(Fields[0].startswith_lower("cp") ? 2 : 1);
3860 ValidString &= Fields[2].startswith_lower("c");
3862 Fields[2] = Fields[2].drop_front(1);
3865 ValidString &= Fields[3].startswith_lower("c");
3867 Fields[3] = Fields[3].drop_front(1);
3871 SmallVector<int, 5> Ranges;
3873 Ranges.append({IsAArch64Builtin ? 1 : 15, 7, 7, 15, 15});
3875 Ranges.append({15, 7, 15});
3877 for (unsigned i=0; i<Fields.size(); ++i) {
3879 ValidString &= !Fields[i].getAsInteger(10, IntField);
3880 ValidString &= (IntField >= 0 && IntField <= Ranges[i]);
3884 return Diag(TheCall->getLocStart(), diag::err_arm_invalid_specialreg)
3885 << Arg->getSourceRange();
3887 } else if (IsAArch64Builtin && Fields.size() == 1) {
3888 // If the register name is one of those that appear in the condition below
3889 // and the special register builtin being used is one of the write builtins,
3890 // then we require that the argument provided for writing to the register
3891 // is an integer constant expression. This is because it will be lowered to
3892 // an MSR (immediate) instruction, so we need to know the immediate at
3894 if (TheCall->getNumArgs() != 2)
3897 std::string RegLower = Reg.lower();
3898 if (RegLower != "spsel" && RegLower != "daifset" && RegLower != "daifclr" &&
3899 RegLower != "pan" && RegLower != "uao")
3902 return SemaBuiltinConstantArgRange(TheCall, 1, 0, 15);
3908 /// SemaBuiltinLongjmp - Handle __builtin_longjmp(void *env[5], int val).
3909 /// This checks that the target supports __builtin_longjmp and
3910 /// that val is a constant 1.
3911 bool Sema::SemaBuiltinLongjmp(CallExpr *TheCall) {
3912 if (!Context.getTargetInfo().hasSjLjLowering())
3913 return Diag(TheCall->getLocStart(), diag::err_builtin_longjmp_unsupported)
3914 << SourceRange(TheCall->getLocStart(), TheCall->getLocEnd());
3916 Expr *Arg = TheCall->getArg(1);
3917 llvm::APSInt Result;
3919 // TODO: This is less than ideal. Overload this to take a value.
3920 if (SemaBuiltinConstantArg(TheCall, 1, Result))
3924 return Diag(TheCall->getLocStart(), diag::err_builtin_longjmp_invalid_val)
3925 << SourceRange(Arg->getLocStart(), Arg->getLocEnd());
3930 /// SemaBuiltinSetjmp - Handle __builtin_setjmp(void *env[5]).
3931 /// This checks that the target supports __builtin_setjmp.
3932 bool Sema::SemaBuiltinSetjmp(CallExpr *TheCall) {
3933 if (!Context.getTargetInfo().hasSjLjLowering())
3934 return Diag(TheCall->getLocStart(), diag::err_builtin_setjmp_unsupported)
3935 << SourceRange(TheCall->getLocStart(), TheCall->getLocEnd());
3940 class UncoveredArgHandler {
3941 enum { Unknown = -1, AllCovered = -2 };
3942 signed FirstUncoveredArg;
3943 SmallVector<const Expr *, 4> DiagnosticExprs;
3946 UncoveredArgHandler() : FirstUncoveredArg(Unknown) { }
3948 bool hasUncoveredArg() const {
3949 return (FirstUncoveredArg >= 0);
3952 unsigned getUncoveredArg() const {
3953 assert(hasUncoveredArg() && "no uncovered argument");
3954 return FirstUncoveredArg;
3957 void setAllCovered() {
3958 // A string has been found with all arguments covered, so clear out
3960 DiagnosticExprs.clear();
3961 FirstUncoveredArg = AllCovered;
3964 void Update(signed NewFirstUncoveredArg, const Expr *StrExpr) {
3965 assert(NewFirstUncoveredArg >= 0 && "Outside range");
3967 // Don't update if a previous string covers all arguments.
3968 if (FirstUncoveredArg == AllCovered)
3971 // UncoveredArgHandler tracks the highest uncovered argument index
3972 // and with it all the strings that match this index.
3973 if (NewFirstUncoveredArg == FirstUncoveredArg)
3974 DiagnosticExprs.push_back(StrExpr);
3975 else if (NewFirstUncoveredArg > FirstUncoveredArg) {
3976 DiagnosticExprs.clear();
3977 DiagnosticExprs.push_back(StrExpr);
3978 FirstUncoveredArg = NewFirstUncoveredArg;
3982 void Diagnose(Sema &S, bool IsFunctionCall, const Expr *ArgExpr);
3985 enum StringLiteralCheckType {
3987 SLCT_UncheckedLiteral,
3990 } // end anonymous namespace
3992 static void CheckFormatString(Sema &S, const StringLiteral *FExpr,
3993 const Expr *OrigFormatExpr,
3994 ArrayRef<const Expr *> Args,
3995 bool HasVAListArg, unsigned format_idx,
3996 unsigned firstDataArg,
3997 Sema::FormatStringType Type,
3998 bool inFunctionCall,
3999 Sema::VariadicCallType CallType,
4000 llvm::SmallBitVector &CheckedVarArgs,
4001 UncoveredArgHandler &UncoveredArg);
4003 // Determine if an expression is a string literal or constant string.
4004 // If this function returns false on the arguments to a function expecting a
4005 // format string, we will usually need to emit a warning.
4006 // True string literals are then checked by CheckFormatString.
4007 static StringLiteralCheckType
4008 checkFormatStringExpr(Sema &S, const Expr *E, ArrayRef<const Expr *> Args,
4009 bool HasVAListArg, unsigned format_idx,
4010 unsigned firstDataArg, Sema::FormatStringType Type,
4011 Sema::VariadicCallType CallType, bool InFunctionCall,
4012 llvm::SmallBitVector &CheckedVarArgs,
4013 UncoveredArgHandler &UncoveredArg) {
4015 if (E->isTypeDependent() || E->isValueDependent())
4016 return SLCT_NotALiteral;
4018 E = E->IgnoreParenCasts();
4020 if (E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull))
4021 // Technically -Wformat-nonliteral does not warn about this case.
4022 // The behavior of printf and friends in this case is implementation
4023 // dependent. Ideally if the format string cannot be null then
4024 // it should have a 'nonnull' attribute in the function prototype.
4025 return SLCT_UncheckedLiteral;
4027 switch (E->getStmtClass()) {
4028 case Stmt::BinaryConditionalOperatorClass:
4029 case Stmt::ConditionalOperatorClass: {
4030 // The expression is a literal if both sub-expressions were, and it was
4031 // completely checked only if both sub-expressions were checked.
4032 const AbstractConditionalOperator *C =
4033 cast<AbstractConditionalOperator>(E);
4035 // Determine whether it is necessary to check both sub-expressions, for
4036 // example, because the condition expression is a constant that can be
4037 // evaluated at compile time.
4038 bool CheckLeft = true, CheckRight = true;
4041 if (C->getCond()->EvaluateAsBooleanCondition(Cond, S.getASTContext())) {
4048 StringLiteralCheckType Left;
4050 Left = SLCT_UncheckedLiteral;
4052 Left = checkFormatStringExpr(S, C->getTrueExpr(), Args,
4053 HasVAListArg, format_idx, firstDataArg,
4054 Type, CallType, InFunctionCall,
4055 CheckedVarArgs, UncoveredArg);
4056 if (Left == SLCT_NotALiteral || !CheckRight)
4060 StringLiteralCheckType Right =
4061 checkFormatStringExpr(S, C->getFalseExpr(), Args,
4062 HasVAListArg, format_idx, firstDataArg,
4063 Type, CallType, InFunctionCall, CheckedVarArgs,
4066 return (CheckLeft && Left < Right) ? Left : Right;
4069 case Stmt::ImplicitCastExprClass: {
4070 E = cast<ImplicitCastExpr>(E)->getSubExpr();
4074 case Stmt::OpaqueValueExprClass:
4075 if (const Expr *src = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
4079 return SLCT_NotALiteral;
4081 case Stmt::PredefinedExprClass:
4082 // While __func__, etc., are technically not string literals, they
4083 // cannot contain format specifiers and thus are not a security
4085 return SLCT_UncheckedLiteral;
4087 case Stmt::DeclRefExprClass: {
4088 const DeclRefExpr *DR = cast<DeclRefExpr>(E);
4090 // As an exception, do not flag errors for variables binding to
4091 // const string literals.
4092 if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
4093 bool isConstant = false;
4094 QualType T = DR->getType();
4096 if (const ArrayType *AT = S.Context.getAsArrayType(T)) {
4097 isConstant = AT->getElementType().isConstant(S.Context);
4098 } else if (const PointerType *PT = T->getAs<PointerType>()) {
4099 isConstant = T.isConstant(S.Context) &&
4100 PT->getPointeeType().isConstant(S.Context);
4101 } else if (T->isObjCObjectPointerType()) {
4102 // In ObjC, there is usually no "const ObjectPointer" type,
4103 // so don't check if the pointee type is constant.
4104 isConstant = T.isConstant(S.Context);
4108 if (const Expr *Init = VD->getAnyInitializer()) {
4109 // Look through initializers like const char c[] = { "foo" }
4110 if (const InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) {
4111 if (InitList->isStringLiteralInit())
4112 Init = InitList->getInit(0)->IgnoreParenImpCasts();
4114 return checkFormatStringExpr(S, Init, Args,
4115 HasVAListArg, format_idx,
4116 firstDataArg, Type, CallType,
4117 /*InFunctionCall*/false, CheckedVarArgs,
4122 // For vprintf* functions (i.e., HasVAListArg==true), we add a
4123 // special check to see if the format string is a function parameter
4124 // of the function calling the printf function. If the function
4125 // has an attribute indicating it is a printf-like function, then we
4126 // should suppress warnings concerning non-literals being used in a call
4127 // to a vprintf function. For example:
4130 // logmessage(char const *fmt __attribute__ (format (printf, 1, 2)), ...){
4132 // va_start(ap, fmt);
4133 // vprintf(fmt, ap); // Do NOT emit a warning about "fmt".
4137 if (const ParmVarDecl *PV = dyn_cast<ParmVarDecl>(VD)) {
4138 if (const NamedDecl *ND = dyn_cast<NamedDecl>(PV->getDeclContext())) {
4139 int PVIndex = PV->getFunctionScopeIndex() + 1;
4140 for (const auto *PVFormat : ND->specific_attrs<FormatAttr>()) {
4141 // adjust for implicit parameter
4142 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
4143 if (MD->isInstance())
4145 // We also check if the formats are compatible.
4146 // We can't pass a 'scanf' string to a 'printf' function.
4147 if (PVIndex == PVFormat->getFormatIdx() &&
4148 Type == S.GetFormatStringType(PVFormat))
4149 return SLCT_UncheckedLiteral;
4156 return SLCT_NotALiteral;
4159 case Stmt::CallExprClass:
4160 case Stmt::CXXMemberCallExprClass: {
4161 const CallExpr *CE = cast<CallExpr>(E);
4162 if (const NamedDecl *ND = dyn_cast_or_null<NamedDecl>(CE->getCalleeDecl())) {
4163 if (const FormatArgAttr *FA = ND->getAttr<FormatArgAttr>()) {
4164 unsigned ArgIndex = FA->getFormatIdx();
4165 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND))
4166 if (MD->isInstance())
4168 const Expr *Arg = CE->getArg(ArgIndex - 1);
4170 return checkFormatStringExpr(S, Arg, Args,
4171 HasVAListArg, format_idx, firstDataArg,
4172 Type, CallType, InFunctionCall,
4173 CheckedVarArgs, UncoveredArg);
4174 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
4175 unsigned BuiltinID = FD->getBuiltinID();
4176 if (BuiltinID == Builtin::BI__builtin___CFStringMakeConstantString ||
4177 BuiltinID == Builtin::BI__builtin___NSStringMakeConstantString) {
4178 const Expr *Arg = CE->getArg(0);
4179 return checkFormatStringExpr(S, Arg, Args,
4180 HasVAListArg, format_idx,
4181 firstDataArg, Type, CallType,
4182 InFunctionCall, CheckedVarArgs,
4188 return SLCT_NotALiteral;
4190 case Stmt::ObjCStringLiteralClass:
4191 case Stmt::StringLiteralClass: {
4192 const StringLiteral *StrE = nullptr;
4194 if (const ObjCStringLiteral *ObjCFExpr = dyn_cast<ObjCStringLiteral>(E))
4195 StrE = ObjCFExpr->getString();
4197 StrE = cast<StringLiteral>(E);
4200 CheckFormatString(S, StrE, E, Args, HasVAListArg, format_idx,
4201 firstDataArg, Type, InFunctionCall, CallType,
4202 CheckedVarArgs, UncoveredArg);
4203 return SLCT_CheckedLiteral;
4206 return SLCT_NotALiteral;
4210 return SLCT_NotALiteral;
4214 Sema::FormatStringType Sema::GetFormatStringType(const FormatAttr *Format) {
4215 return llvm::StringSwitch<FormatStringType>(Format->getType()->getName())
4216 .Case("scanf", FST_Scanf)
4217 .Cases("printf", "printf0", FST_Printf)
4218 .Cases("NSString", "CFString", FST_NSString)
4219 .Case("strftime", FST_Strftime)
4220 .Case("strfmon", FST_Strfmon)
4221 .Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
4222 .Case("freebsd_kprintf", FST_FreeBSDKPrintf)
4223 .Case("os_trace", FST_OSTrace)
4224 .Default(FST_Unknown);
4227 /// CheckFormatArguments - Check calls to printf and scanf (and similar
4228 /// functions) for correct use of format strings.
4229 /// Returns true if a format string has been fully checked.
4230 bool Sema::CheckFormatArguments(const FormatAttr *Format,
4231 ArrayRef<const Expr *> Args,
4233 VariadicCallType CallType,
4234 SourceLocation Loc, SourceRange Range,
4235 llvm::SmallBitVector &CheckedVarArgs) {
4236 FormatStringInfo FSI;
4237 if (getFormatStringInfo(Format, IsCXXMember, &FSI))
4238 return CheckFormatArguments(Args, FSI.HasVAListArg, FSI.FormatIdx,
4239 FSI.FirstDataArg, GetFormatStringType(Format),
4240 CallType, Loc, Range, CheckedVarArgs);
4244 bool Sema::CheckFormatArguments(ArrayRef<const Expr *> Args,
4245 bool HasVAListArg, unsigned format_idx,
4246 unsigned firstDataArg, FormatStringType Type,
4247 VariadicCallType CallType,
4248 SourceLocation Loc, SourceRange Range,
4249 llvm::SmallBitVector &CheckedVarArgs) {
4250 // CHECK: printf/scanf-like function is called with no format string.
4251 if (format_idx >= Args.size()) {
4252 Diag(Loc, diag::warn_missing_format_string) << Range;
4256 const Expr *OrigFormatExpr = Args[format_idx]->IgnoreParenCasts();
4258 // CHECK: format string is not a string literal.
4260 // Dynamically generated format strings are difficult to
4261 // automatically vet at compile time. Requiring that format strings
4262 // are string literals: (1) permits the checking of format strings by
4263 // the compiler and thereby (2) can practically remove the source of
4264 // many format string exploits.
4266 // Format string can be either ObjC string (e.g. @"%d") or
4267 // C string (e.g. "%d")
4268 // ObjC string uses the same format specifiers as C string, so we can use
4269 // the same format string checking logic for both ObjC and C strings.
4270 UncoveredArgHandler UncoveredArg;
4271 StringLiteralCheckType CT =
4272 checkFormatStringExpr(*this, OrigFormatExpr, Args, HasVAListArg,
4273 format_idx, firstDataArg, Type, CallType,
4274 /*IsFunctionCall*/true, CheckedVarArgs,
4277 // Generate a diagnostic where an uncovered argument is detected.
4278 if (UncoveredArg.hasUncoveredArg()) {
4279 unsigned ArgIdx = UncoveredArg.getUncoveredArg() + firstDataArg;
4280 assert(ArgIdx < Args.size() && "ArgIdx outside bounds");
4281 UncoveredArg.Diagnose(*this, /*IsFunctionCall*/true, Args[ArgIdx]);
4284 if (CT != SLCT_NotALiteral)
4285 // Literal format string found, check done!
4286 return CT == SLCT_CheckedLiteral;
4288 // Strftime is particular as it always uses a single 'time' argument,
4289 // so it is safe to pass a non-literal string.
4290 if (Type == FST_Strftime)
4293 // Do not emit diag when the string param is a macro expansion and the
4294 // format is either NSString or CFString. This is a hack to prevent
4295 // diag when using the NSLocalizedString and CFCopyLocalizedString macros
4296 // which are usually used in place of NS and CF string literals.
4297 SourceLocation FormatLoc = Args[format_idx]->getLocStart();
4298 if (Type == FST_NSString && SourceMgr.isInSystemMacro(FormatLoc))
4301 // If there are no arguments specified, warn with -Wformat-security, otherwise
4302 // warn only with -Wformat-nonliteral.
4303 if (Args.size() == firstDataArg) {
4304 Diag(FormatLoc, diag::warn_format_nonliteral_noargs)
4305 << OrigFormatExpr->getSourceRange();
4310 case FST_FreeBSDKPrintf:
4312 Diag(FormatLoc, diag::note_format_security_fixit)
4313 << FixItHint::CreateInsertion(FormatLoc, "\"%s\", ");
4316 Diag(FormatLoc, diag::note_format_security_fixit)
4317 << FixItHint::CreateInsertion(FormatLoc, "@\"%@\", ");
4321 Diag(FormatLoc, diag::warn_format_nonliteral)
4322 << OrigFormatExpr->getSourceRange();
4328 class CheckFormatHandler : public analyze_format_string::FormatStringHandler {
4331 const StringLiteral *FExpr;
4332 const Expr *OrigFormatExpr;
4333 const unsigned FirstDataArg;
4334 const unsigned NumDataArgs;
4335 const char *Beg; // Start of format string.
4336 const bool HasVAListArg;
4337 ArrayRef<const Expr *> Args;
4339 llvm::SmallBitVector CoveredArgs;
4340 bool usesPositionalArgs;
4342 bool inFunctionCall;
4343 Sema::VariadicCallType CallType;
4344 llvm::SmallBitVector &CheckedVarArgs;
4345 UncoveredArgHandler &UncoveredArg;
4348 CheckFormatHandler(Sema &s, const StringLiteral *fexpr,
4349 const Expr *origFormatExpr, unsigned firstDataArg,
4350 unsigned numDataArgs, const char *beg, bool hasVAListArg,
4351 ArrayRef<const Expr *> Args,
4352 unsigned formatIdx, bool inFunctionCall,
4353 Sema::VariadicCallType callType,
4354 llvm::SmallBitVector &CheckedVarArgs,
4355 UncoveredArgHandler &UncoveredArg)
4356 : S(s), FExpr(fexpr), OrigFormatExpr(origFormatExpr),
4357 FirstDataArg(firstDataArg), NumDataArgs(numDataArgs),
4358 Beg(beg), HasVAListArg(hasVAListArg),
4359 Args(Args), FormatIdx(formatIdx),
4360 usesPositionalArgs(false), atFirstArg(true),
4361 inFunctionCall(inFunctionCall), CallType(callType),
4362 CheckedVarArgs(CheckedVarArgs), UncoveredArg(UncoveredArg) {
4363 CoveredArgs.resize(numDataArgs);
4364 CoveredArgs.reset();
4367 void DoneProcessing();
4369 void HandleIncompleteSpecifier(const char *startSpecifier,
4370 unsigned specifierLen) override;
4372 void HandleInvalidLengthModifier(
4373 const analyze_format_string::FormatSpecifier &FS,
4374 const analyze_format_string::ConversionSpecifier &CS,
4375 const char *startSpecifier, unsigned specifierLen,
4378 void HandleNonStandardLengthModifier(
4379 const analyze_format_string::FormatSpecifier &FS,
4380 const char *startSpecifier, unsigned specifierLen);
4382 void HandleNonStandardConversionSpecifier(
4383 const analyze_format_string::ConversionSpecifier &CS,
4384 const char *startSpecifier, unsigned specifierLen);
4386 void HandlePosition(const char *startPos, unsigned posLen) override;
4388 void HandleInvalidPosition(const char *startSpecifier,
4389 unsigned specifierLen,
4390 analyze_format_string::PositionContext p) override;
4392 void HandleZeroPosition(const char *startPos, unsigned posLen) override;
4394 void HandleNullChar(const char *nullCharacter) override;
4396 template <typename Range>
4398 EmitFormatDiagnostic(Sema &S, bool inFunctionCall, const Expr *ArgumentExpr,
4399 const PartialDiagnostic &PDiag, SourceLocation StringLoc,
4400 bool IsStringLocation, Range StringRange,
4401 ArrayRef<FixItHint> Fixit = None);
4404 bool HandleInvalidConversionSpecifier(unsigned argIndex, SourceLocation Loc,
4405 const char *startSpec,
4406 unsigned specifierLen,
4407 const char *csStart, unsigned csLen);
4409 void HandlePositionalNonpositionalArgs(SourceLocation Loc,
4410 const char *startSpec,
4411 unsigned specifierLen);
4413 SourceRange getFormatStringRange();
4414 CharSourceRange getSpecifierRange(const char *startSpecifier,
4415 unsigned specifierLen);
4416 SourceLocation getLocationOfByte(const char *x);
4418 const Expr *getDataArg(unsigned i) const;
4420 bool CheckNumArgs(const analyze_format_string::FormatSpecifier &FS,
4421 const analyze_format_string::ConversionSpecifier &CS,
4422 const char *startSpecifier, unsigned specifierLen,
4425 template <typename Range>
4426 void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
4427 bool IsStringLocation, Range StringRange,
4428 ArrayRef<FixItHint> Fixit = None);
4430 } // end anonymous namespace
4432 SourceRange CheckFormatHandler::getFormatStringRange() {
4433 return OrigFormatExpr->getSourceRange();
4436 CharSourceRange CheckFormatHandler::
4437 getSpecifierRange(const char *startSpecifier, unsigned specifierLen) {
4438 SourceLocation Start = getLocationOfByte(startSpecifier);
4439 SourceLocation End = getLocationOfByte(startSpecifier + specifierLen - 1);
4441 // Advance the end SourceLocation by one due to half-open ranges.
4442 End = End.getLocWithOffset(1);
4444 return CharSourceRange::getCharRange(Start, End);
4447 SourceLocation CheckFormatHandler::getLocationOfByte(const char *x) {
4448 return S.getLocationOfStringLiteralByte(FExpr, x - Beg);
4451 void CheckFormatHandler::HandleIncompleteSpecifier(const char *startSpecifier,
4452 unsigned specifierLen){
4453 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_incomplete_specifier),
4454 getLocationOfByte(startSpecifier),
4455 /*IsStringLocation*/true,
4456 getSpecifierRange(startSpecifier, specifierLen));
4459 void CheckFormatHandler::HandleInvalidLengthModifier(
4460 const analyze_format_string::FormatSpecifier &FS,
4461 const analyze_format_string::ConversionSpecifier &CS,
4462 const char *startSpecifier, unsigned specifierLen, unsigned DiagID) {
4463 using namespace analyze_format_string;
4465 const LengthModifier &LM = FS.getLengthModifier();
4466 CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
4468 // See if we know how to fix this length modifier.
4469 Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
4471 EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
4472 getLocationOfByte(LM.getStart()),
4473 /*IsStringLocation*/true,
4474 getSpecifierRange(startSpecifier, specifierLen));
4476 S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
4477 << FixedLM->toString()
4478 << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
4482 if (DiagID == diag::warn_format_nonsensical_length)
4483 Hint = FixItHint::CreateRemoval(LMRange);
4485 EmitFormatDiagnostic(S.PDiag(DiagID) << LM.toString() << CS.toString(),
4486 getLocationOfByte(LM.getStart()),
4487 /*IsStringLocation*/true,
4488 getSpecifierRange(startSpecifier, specifierLen),
4493 void CheckFormatHandler::HandleNonStandardLengthModifier(
4494 const analyze_format_string::FormatSpecifier &FS,
4495 const char *startSpecifier, unsigned specifierLen) {
4496 using namespace analyze_format_string;
4498 const LengthModifier &LM = FS.getLengthModifier();
4499 CharSourceRange LMRange = getSpecifierRange(LM.getStart(), LM.getLength());
4501 // See if we know how to fix this length modifier.
4502 Optional<LengthModifier> FixedLM = FS.getCorrectedLengthModifier();
4504 EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
4505 << LM.toString() << 0,
4506 getLocationOfByte(LM.getStart()),
4507 /*IsStringLocation*/true,
4508 getSpecifierRange(startSpecifier, specifierLen));
4510 S.Diag(getLocationOfByte(LM.getStart()), diag::note_format_fix_specifier)
4511 << FixedLM->toString()
4512 << FixItHint::CreateReplacement(LMRange, FixedLM->toString());
4515 EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
4516 << LM.toString() << 0,
4517 getLocationOfByte(LM.getStart()),
4518 /*IsStringLocation*/true,
4519 getSpecifierRange(startSpecifier, specifierLen));
4523 void CheckFormatHandler::HandleNonStandardConversionSpecifier(
4524 const analyze_format_string::ConversionSpecifier &CS,
4525 const char *startSpecifier, unsigned specifierLen) {
4526 using namespace analyze_format_string;
4528 // See if we know how to fix this conversion specifier.
4529 Optional<ConversionSpecifier> FixedCS = CS.getStandardSpecifier();
4531 EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
4532 << CS.toString() << /*conversion specifier*/1,
4533 getLocationOfByte(CS.getStart()),
4534 /*IsStringLocation*/true,
4535 getSpecifierRange(startSpecifier, specifierLen));
4537 CharSourceRange CSRange = getSpecifierRange(CS.getStart(), CS.getLength());
4538 S.Diag(getLocationOfByte(CS.getStart()), diag::note_format_fix_specifier)
4539 << FixedCS->toString()
4540 << FixItHint::CreateReplacement(CSRange, FixedCS->toString());
4542 EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard)
4543 << CS.toString() << /*conversion specifier*/1,
4544 getLocationOfByte(CS.getStart()),
4545 /*IsStringLocation*/true,
4546 getSpecifierRange(startSpecifier, specifierLen));
4550 void CheckFormatHandler::HandlePosition(const char *startPos,
4552 EmitFormatDiagnostic(S.PDiag(diag::warn_format_non_standard_positional_arg),
4553 getLocationOfByte(startPos),
4554 /*IsStringLocation*/true,
4555 getSpecifierRange(startPos, posLen));
4559 CheckFormatHandler::HandleInvalidPosition(const char *startPos, unsigned posLen,
4560 analyze_format_string::PositionContext p) {
4561 EmitFormatDiagnostic(S.PDiag(diag::warn_format_invalid_positional_specifier)
4563 getLocationOfByte(startPos), /*IsStringLocation*/true,
4564 getSpecifierRange(startPos, posLen));
4567 void CheckFormatHandler::HandleZeroPosition(const char *startPos,
4569 EmitFormatDiagnostic(S.PDiag(diag::warn_format_zero_positional_specifier),
4570 getLocationOfByte(startPos),
4571 /*IsStringLocation*/true,
4572 getSpecifierRange(startPos, posLen));
4575 void CheckFormatHandler::HandleNullChar(const char *nullCharacter) {
4576 if (!isa<ObjCStringLiteral>(OrigFormatExpr)) {
4577 // The presence of a null character is likely an error.
4578 EmitFormatDiagnostic(
4579 S.PDiag(diag::warn_printf_format_string_contains_null_char),
4580 getLocationOfByte(nullCharacter), /*IsStringLocation*/true,
4581 getFormatStringRange());
4585 // Note that this may return NULL if there was an error parsing or building
4586 // one of the argument expressions.
4587 const Expr *CheckFormatHandler::getDataArg(unsigned i) const {
4588 return Args[FirstDataArg + i];
4591 void CheckFormatHandler::DoneProcessing() {
4592 // Does the number of data arguments exceed the number of
4593 // format conversions in the format string?
4594 if (!HasVAListArg) {
4595 // Find any arguments that weren't covered.
4597 signed notCoveredArg = CoveredArgs.find_first();
4598 if (notCoveredArg >= 0) {
4599 assert((unsigned)notCoveredArg < NumDataArgs);
4600 UncoveredArg.Update(notCoveredArg, OrigFormatExpr);
4602 UncoveredArg.setAllCovered();
4607 void UncoveredArgHandler::Diagnose(Sema &S, bool IsFunctionCall,
4608 const Expr *ArgExpr) {
4609 assert(hasUncoveredArg() && DiagnosticExprs.size() > 0 &&
4615 SourceLocation Loc = ArgExpr->getLocStart();
4617 if (S.getSourceManager().isInSystemMacro(Loc))
4620 PartialDiagnostic PDiag = S.PDiag(diag::warn_printf_data_arg_not_used);
4621 for (auto E : DiagnosticExprs)
4622 PDiag << E->getSourceRange();
4624 CheckFormatHandler::EmitFormatDiagnostic(
4625 S, IsFunctionCall, DiagnosticExprs[0],
4626 PDiag, Loc, /*IsStringLocation*/false,
4627 DiagnosticExprs[0]->getSourceRange());
4631 CheckFormatHandler::HandleInvalidConversionSpecifier(unsigned argIndex,
4633 const char *startSpec,
4634 unsigned specifierLen,
4635 const char *csStart,
4637 bool keepGoing = true;
4638 if (argIndex < NumDataArgs) {
4639 // Consider the argument coverered, even though the specifier doesn't
4641 CoveredArgs.set(argIndex);
4644 // If argIndex exceeds the number of data arguments we
4645 // don't issue a warning because that is just a cascade of warnings (and
4646 // they may have intended '%%' anyway). We don't want to continue processing
4647 // the format string after this point, however, as we will like just get
4648 // gibberish when trying to match arguments.
4652 StringRef Specifier(csStart, csLen);
4654 // If the specifier in non-printable, it could be the first byte of a UTF-8
4655 // sequence. In that case, print the UTF-8 code point. If not, print the byte
4657 std::string CodePointStr;
4658 if (!llvm::sys::locale::isPrint(*csStart)) {
4660 const UTF8 **B = reinterpret_cast<const UTF8 **>(&csStart);
4662 reinterpret_cast<const UTF8 *>(csStart + csLen);
4663 ConversionResult Result =
4664 llvm::convertUTF8Sequence(B, E, &CodePoint, strictConversion);
4666 if (Result != conversionOK) {
4667 unsigned char FirstChar = *csStart;
4668 CodePoint = (UTF32)FirstChar;
4671 llvm::raw_string_ostream OS(CodePointStr);
4672 if (CodePoint < 256)
4673 OS << "\\x" << llvm::format("%02x", CodePoint);
4674 else if (CodePoint <= 0xFFFF)
4675 OS << "\\u" << llvm::format("%04x", CodePoint);
4677 OS << "\\U" << llvm::format("%08x", CodePoint);
4679 Specifier = CodePointStr;
4682 EmitFormatDiagnostic(
4683 S.PDiag(diag::warn_format_invalid_conversion) << Specifier, Loc,
4684 /*IsStringLocation*/ true, getSpecifierRange(startSpec, specifierLen));
4690 CheckFormatHandler::HandlePositionalNonpositionalArgs(SourceLocation Loc,
4691 const char *startSpec,
4692 unsigned specifierLen) {
4693 EmitFormatDiagnostic(
4694 S.PDiag(diag::warn_format_mix_positional_nonpositional_args),
4695 Loc, /*isStringLoc*/true, getSpecifierRange(startSpec, specifierLen));
4699 CheckFormatHandler::CheckNumArgs(
4700 const analyze_format_string::FormatSpecifier &FS,
4701 const analyze_format_string::ConversionSpecifier &CS,
4702 const char *startSpecifier, unsigned specifierLen, unsigned argIndex) {
4704 if (argIndex >= NumDataArgs) {
4705 PartialDiagnostic PDiag = FS.usesPositionalArg()
4706 ? (S.PDiag(diag::warn_printf_positional_arg_exceeds_data_args)
4707 << (argIndex+1) << NumDataArgs)
4708 : S.PDiag(diag::warn_printf_insufficient_data_args);
4709 EmitFormatDiagnostic(
4710 PDiag, getLocationOfByte(CS.getStart()), /*IsStringLocation*/true,
4711 getSpecifierRange(startSpecifier, specifierLen));
4713 // Since more arguments than conversion tokens are given, by extension
4714 // all arguments are covered, so mark this as so.
4715 UncoveredArg.setAllCovered();
4721 template<typename Range>
4722 void CheckFormatHandler::EmitFormatDiagnostic(PartialDiagnostic PDiag,
4724 bool IsStringLocation,
4726 ArrayRef<FixItHint> FixIt) {
4727 EmitFormatDiagnostic(S, inFunctionCall, Args[FormatIdx], PDiag,
4728 Loc, IsStringLocation, StringRange, FixIt);
4731 /// \brief If the format string is not within the funcion call, emit a note
4732 /// so that the function call and string are in diagnostic messages.
4734 /// \param InFunctionCall if true, the format string is within the function
4735 /// call and only one diagnostic message will be produced. Otherwise, an
4736 /// extra note will be emitted pointing to location of the format string.
4738 /// \param ArgumentExpr the expression that is passed as the format string
4739 /// argument in the function call. Used for getting locations when two
4740 /// diagnostics are emitted.
4742 /// \param PDiag the callee should already have provided any strings for the
4743 /// diagnostic message. This function only adds locations and fixits
4746 /// \param Loc primary location for diagnostic. If two diagnostics are
4747 /// required, one will be at Loc and a new SourceLocation will be created for
4750 /// \param IsStringLocation if true, Loc points to the format string should be
4751 /// used for the note. Otherwise, Loc points to the argument list and will
4752 /// be used with PDiag.
4754 /// \param StringRange some or all of the string to highlight. This is
4755 /// templated so it can accept either a CharSourceRange or a SourceRange.
4757 /// \param FixIt optional fix it hint for the format string.
4758 template <typename Range>
4759 void CheckFormatHandler::EmitFormatDiagnostic(
4760 Sema &S, bool InFunctionCall, const Expr *ArgumentExpr,
4761 const PartialDiagnostic &PDiag, SourceLocation Loc, bool IsStringLocation,
4762 Range StringRange, ArrayRef<FixItHint> FixIt) {
4763 if (InFunctionCall) {
4764 const Sema::SemaDiagnosticBuilder &D = S.Diag(Loc, PDiag);
4768 S.Diag(IsStringLocation ? ArgumentExpr->getExprLoc() : Loc, PDiag)
4769 << ArgumentExpr->getSourceRange();
4771 const Sema::SemaDiagnosticBuilder &Note =
4772 S.Diag(IsStringLocation ? Loc : StringRange.getBegin(),
4773 diag::note_format_string_defined);
4775 Note << StringRange;
4780 //===--- CHECK: Printf format string checking ------------------------------===//
4783 class CheckPrintfHandler : public CheckFormatHandler {
4787 CheckPrintfHandler(Sema &s, const StringLiteral *fexpr,
4788 const Expr *origFormatExpr, unsigned firstDataArg,
4789 unsigned numDataArgs, bool isObjC,
4790 const char *beg, bool hasVAListArg,
4791 ArrayRef<const Expr *> Args,
4792 unsigned formatIdx, bool inFunctionCall,
4793 Sema::VariadicCallType CallType,
4794 llvm::SmallBitVector &CheckedVarArgs,
4795 UncoveredArgHandler &UncoveredArg)
4796 : CheckFormatHandler(s, fexpr, origFormatExpr, firstDataArg,
4797 numDataArgs, beg, hasVAListArg, Args,
4798 formatIdx, inFunctionCall, CallType, CheckedVarArgs,
4803 bool HandleInvalidPrintfConversionSpecifier(
4804 const analyze_printf::PrintfSpecifier &FS,
4805 const char *startSpecifier,
4806 unsigned specifierLen) override;
4808 bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
4809 const char *startSpecifier,
4810 unsigned specifierLen) override;
4811 bool checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
4812 const char *StartSpecifier,
4813 unsigned SpecifierLen,
4816 bool HandleAmount(const analyze_format_string::OptionalAmount &Amt, unsigned k,
4817 const char *startSpecifier, unsigned specifierLen);
4818 void HandleInvalidAmount(const analyze_printf::PrintfSpecifier &FS,
4819 const analyze_printf::OptionalAmount &Amt,
4821 const char *startSpecifier, unsigned specifierLen);
4822 void HandleFlag(const analyze_printf::PrintfSpecifier &FS,
4823 const analyze_printf::OptionalFlag &flag,
4824 const char *startSpecifier, unsigned specifierLen);
4825 void HandleIgnoredFlag(const analyze_printf::PrintfSpecifier &FS,
4826 const analyze_printf::OptionalFlag &ignoredFlag,
4827 const analyze_printf::OptionalFlag &flag,
4828 const char *startSpecifier, unsigned specifierLen);
4829 bool checkForCStrMembers(const analyze_printf::ArgType &AT,
4832 void HandleEmptyObjCModifierFlag(const char *startFlag,
4833 unsigned flagLen) override;
4835 void HandleInvalidObjCModifierFlag(const char *startFlag,
4836 unsigned flagLen) override;
4838 void HandleObjCFlagsWithNonObjCConversion(const char *flagsStart,
4839 const char *flagsEnd,
4840 const char *conversionPosition)
4843 } // end anonymous namespace
4845 bool CheckPrintfHandler::HandleInvalidPrintfConversionSpecifier(
4846 const analyze_printf::PrintfSpecifier &FS,
4847 const char *startSpecifier,
4848 unsigned specifierLen) {
4849 const analyze_printf::PrintfConversionSpecifier &CS =
4850 FS.getConversionSpecifier();
4852 return HandleInvalidConversionSpecifier(FS.getArgIndex(),
4853 getLocationOfByte(CS.getStart()),
4854 startSpecifier, specifierLen,
4855 CS.getStart(), CS.getLength());
4858 bool CheckPrintfHandler::HandleAmount(
4859 const analyze_format_string::OptionalAmount &Amt,
4860 unsigned k, const char *startSpecifier,
4861 unsigned specifierLen) {
4862 if (Amt.hasDataArgument()) {
4863 if (!HasVAListArg) {
4864 unsigned argIndex = Amt.getArgIndex();
4865 if (argIndex >= NumDataArgs) {
4866 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_missing_arg)
4868 getLocationOfByte(Amt.getStart()),
4869 /*IsStringLocation*/true,
4870 getSpecifierRange(startSpecifier, specifierLen));
4871 // Don't do any more checking. We will just emit
4876 // Type check the data argument. It should be an 'int'.
4877 // Although not in conformance with C99, we also allow the argument to be
4878 // an 'unsigned int' as that is a reasonably safe case. GCC also
4879 // doesn't emit a warning for that case.
4880 CoveredArgs.set(argIndex);
4881 const Expr *Arg = getDataArg(argIndex);
4885 QualType T = Arg->getType();
4887 const analyze_printf::ArgType &AT = Amt.getArgType(S.Context);
4888 assert(AT.isValid());
4890 if (!AT.matchesType(S.Context, T)) {
4891 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_asterisk_wrong_type)
4892 << k << AT.getRepresentativeTypeName(S.Context)
4893 << T << Arg->getSourceRange(),
4894 getLocationOfByte(Amt.getStart()),
4895 /*IsStringLocation*/true,
4896 getSpecifierRange(startSpecifier, specifierLen));
4897 // Don't do any more checking. We will just emit
4906 void CheckPrintfHandler::HandleInvalidAmount(
4907 const analyze_printf::PrintfSpecifier &FS,
4908 const analyze_printf::OptionalAmount &Amt,
4910 const char *startSpecifier,
4911 unsigned specifierLen) {
4912 const analyze_printf::PrintfConversionSpecifier &CS =
4913 FS.getConversionSpecifier();
4916 Amt.getHowSpecified() == analyze_printf::OptionalAmount::Constant
4917 ? FixItHint::CreateRemoval(getSpecifierRange(Amt.getStart(),
4918 Amt.getConstantLength()))
4921 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_optional_amount)
4922 << type << CS.toString(),
4923 getLocationOfByte(Amt.getStart()),
4924 /*IsStringLocation*/true,
4925 getSpecifierRange(startSpecifier, specifierLen),
4929 void CheckPrintfHandler::HandleFlag(const analyze_printf::PrintfSpecifier &FS,
4930 const analyze_printf::OptionalFlag &flag,
4931 const char *startSpecifier,
4932 unsigned specifierLen) {
4933 // Warn about pointless flag with a fixit removal.
4934 const analyze_printf::PrintfConversionSpecifier &CS =
4935 FS.getConversionSpecifier();
4936 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_nonsensical_flag)
4937 << flag.toString() << CS.toString(),
4938 getLocationOfByte(flag.getPosition()),
4939 /*IsStringLocation*/true,
4940 getSpecifierRange(startSpecifier, specifierLen),
4941 FixItHint::CreateRemoval(
4942 getSpecifierRange(flag.getPosition(), 1)));
4945 void CheckPrintfHandler::HandleIgnoredFlag(
4946 const analyze_printf::PrintfSpecifier &FS,
4947 const analyze_printf::OptionalFlag &ignoredFlag,
4948 const analyze_printf::OptionalFlag &flag,
4949 const char *startSpecifier,
4950 unsigned specifierLen) {
4951 // Warn about ignored flag with a fixit removal.
4952 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_ignored_flag)
4953 << ignoredFlag.toString() << flag.toString(),
4954 getLocationOfByte(ignoredFlag.getPosition()),
4955 /*IsStringLocation*/true,
4956 getSpecifierRange(startSpecifier, specifierLen),
4957 FixItHint::CreateRemoval(
4958 getSpecifierRange(ignoredFlag.getPosition(), 1)));
4961 // void EmitFormatDiagnostic(PartialDiagnostic PDiag, SourceLocation StringLoc,
4962 // bool IsStringLocation, Range StringRange,
4963 // ArrayRef<FixItHint> Fixit = None);
4965 void CheckPrintfHandler::HandleEmptyObjCModifierFlag(const char *startFlag,
4967 // Warn about an empty flag.
4968 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_empty_objc_flag),
4969 getLocationOfByte(startFlag),
4970 /*IsStringLocation*/true,
4971 getSpecifierRange(startFlag, flagLen));
4974 void CheckPrintfHandler::HandleInvalidObjCModifierFlag(const char *startFlag,
4976 // Warn about an invalid flag.
4977 auto Range = getSpecifierRange(startFlag, flagLen);
4978 StringRef flag(startFlag, flagLen);
4979 EmitFormatDiagnostic(S.PDiag(diag::warn_printf_invalid_objc_flag) << flag,
4980 getLocationOfByte(startFlag),
4981 /*IsStringLocation*/true,
4982 Range, FixItHint::CreateRemoval(Range));
4985 void CheckPrintfHandler::HandleObjCFlagsWithNonObjCConversion(
4986 const char *flagsStart, const char *flagsEnd, const char *conversionPosition) {
4987 // Warn about using '[...]' without a '@' conversion.
4988 auto Range = getSpecifierRange(flagsStart, flagsEnd - flagsStart + 1);
4989 auto diag = diag::warn_printf_ObjCflags_without_ObjCConversion;
4990 EmitFormatDiagnostic(S.PDiag(diag) << StringRef(conversionPosition, 1),
4991 getLocationOfByte(conversionPosition),
4992 /*IsStringLocation*/true,
4993 Range, FixItHint::CreateRemoval(Range));
4996 // Determines if the specified is a C++ class or struct containing
4997 // a member with the specified name and kind (e.g. a CXXMethodDecl named
4999 template<typename MemberKind>
5000 static llvm::SmallPtrSet<MemberKind*, 1>
5001 CXXRecordMembersNamed(StringRef Name, Sema &S, QualType Ty) {
5002 const RecordType *RT = Ty->getAs<RecordType>();
5003 llvm::SmallPtrSet<MemberKind*, 1> Results;
5007 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
5008 if (!RD || !RD->getDefinition())
5011 LookupResult R(S, &S.Context.Idents.get(Name), SourceLocation(),
5012 Sema::LookupMemberName);
5013 R.suppressDiagnostics();
5015 // We just need to include all members of the right kind turned up by the
5016 // filter, at this point.
5017 if (S.LookupQualifiedName(R, RT->getDecl()))
5018 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
5019 NamedDecl *decl = (*I)->getUnderlyingDecl();
5020 if (MemberKind *FK = dyn_cast<MemberKind>(decl))
5026 /// Check if we could call '.c_str()' on an object.
5028 /// FIXME: This returns the wrong results in some cases (if cv-qualifiers don't
5029 /// allow the call, or if it would be ambiguous).
5030 bool Sema::hasCStrMethod(const Expr *E) {
5031 typedef llvm::SmallPtrSet<CXXMethodDecl*, 1> MethodSet;
5033 CXXRecordMembersNamed<CXXMethodDecl>("c_str", *this, E->getType());
5034 for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
5036 if ((*MI)->getMinRequiredArguments() == 0)
5041 // Check if a (w)string was passed when a (w)char* was needed, and offer a
5042 // better diagnostic if so. AT is assumed to be valid.
5043 // Returns true when a c_str() conversion method is found.
5044 bool CheckPrintfHandler::checkForCStrMembers(
5045 const analyze_printf::ArgType &AT, const Expr *E) {
5046 typedef llvm::SmallPtrSet<CXXMethodDecl*, 1> MethodSet;
5049 CXXRecordMembersNamed<CXXMethodDecl>("c_str", S, E->getType());
5051 for (MethodSet::iterator MI = Results.begin(), ME = Results.end();
5053 const CXXMethodDecl *Method = *MI;
5054 if (Method->getMinRequiredArguments() == 0 &&
5055 AT.matchesType(S.Context, Method->getReturnType())) {
5056 // FIXME: Suggest parens if the expression needs them.
5057 SourceLocation EndLoc = S.getLocForEndOfToken(E->getLocEnd());
5058 S.Diag(E->getLocStart(), diag::note_printf_c_str)
5060 << FixItHint::CreateInsertion(EndLoc, ".c_str()");
5069 CheckPrintfHandler::HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier
5071 const char *startSpecifier,
5072 unsigned specifierLen) {
5073 using namespace analyze_format_string;
5074 using namespace analyze_printf;
5075 const PrintfConversionSpecifier &CS = FS.getConversionSpecifier();
5077 if (FS.consumesDataArgument()) {
5080 usesPositionalArgs = FS.usesPositionalArg();
5082 else if (usesPositionalArgs != FS.usesPositionalArg()) {
5083 HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
5084 startSpecifier, specifierLen);
5089 // First check if the field width, precision, and conversion specifier
5090 // have matching data arguments.
5091 if (!HandleAmount(FS.getFieldWidth(), /* field width */ 0,
5092 startSpecifier, specifierLen)) {
5096 if (!HandleAmount(FS.getPrecision(), /* precision */ 1,
5097 startSpecifier, specifierLen)) {
5101 if (!CS.consumesDataArgument()) {
5102 // FIXME: Technically specifying a precision or field width here
5103 // makes no sense. Worth issuing a warning at some point.
5107 // Consume the argument.
5108 unsigned argIndex = FS.getArgIndex();
5109 if (argIndex < NumDataArgs) {
5110 // The check to see if the argIndex is valid will come later.
5111 // We set the bit here because we may exit early from this
5112 // function if we encounter some other error.
5113 CoveredArgs.set(argIndex);
5116 // FreeBSD kernel extensions.
5117 if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
5118 CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
5119 // We need at least two arguments.
5120 if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
5123 // Claim the second argument.
5124 CoveredArgs.set(argIndex + 1);
5126 // Type check the first argument (int for %b, pointer for %D)
5127 const Expr *Ex = getDataArg(argIndex);
5128 const analyze_printf::ArgType &AT =
5129 (CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
5130 ArgType(S.Context.IntTy) : ArgType::CPointerTy;
5131 if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
5132 EmitFormatDiagnostic(
5133 S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
5134 << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
5135 << false << Ex->getSourceRange(),
5136 Ex->getLocStart(), /*IsStringLocation*/false,
5137 getSpecifierRange(startSpecifier, specifierLen));
5139 // Type check the second argument (char * for both %b and %D)
5140 Ex = getDataArg(argIndex + 1);
5141 const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
5142 if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
5143 EmitFormatDiagnostic(
5144 S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
5145 << AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
5146 << false << Ex->getSourceRange(),
5147 Ex->getLocStart(), /*IsStringLocation*/false,
5148 getSpecifierRange(startSpecifier, specifierLen));
5153 // Check for using an Objective-C specific conversion specifier
5154 // in a non-ObjC literal.
5155 if (!ObjCContext && CS.isObjCArg()) {
5156 return HandleInvalidPrintfConversionSpecifier(FS, startSpecifier,
5160 // Check for invalid use of field width
5161 if (!FS.hasValidFieldWidth()) {
5162 HandleInvalidAmount(FS, FS.getFieldWidth(), /* field width */ 0,
5163 startSpecifier, specifierLen);
5166 // Check for invalid use of precision
5167 if (!FS.hasValidPrecision()) {
5168 HandleInvalidAmount(FS, FS.getPrecision(), /* precision */ 1,
5169 startSpecifier, specifierLen);
5172 // Check each flag does not conflict with any other component.
5173 if (!FS.hasValidThousandsGroupingPrefix())
5174 HandleFlag(FS, FS.hasThousandsGrouping(), startSpecifier, specifierLen);
5175 if (!FS.hasValidLeadingZeros())
5176 HandleFlag(FS, FS.hasLeadingZeros(), startSpecifier, specifierLen);
5177 if (!FS.hasValidPlusPrefix())
5178 HandleFlag(FS, FS.hasPlusPrefix(), startSpecifier, specifierLen);
5179 if (!FS.hasValidSpacePrefix())
5180 HandleFlag(FS, FS.hasSpacePrefix(), startSpecifier, specifierLen);
5181 if (!FS.hasValidAlternativeForm())
5182 HandleFlag(FS, FS.hasAlternativeForm(), startSpecifier, specifierLen);
5183 if (!FS.hasValidLeftJustified())
5184 HandleFlag(FS, FS.isLeftJustified(), startSpecifier, specifierLen);
5186 // Check that flags are not ignored by another flag
5187 if (FS.hasSpacePrefix() && FS.hasPlusPrefix()) // ' ' ignored by '+'
5188 HandleIgnoredFlag(FS, FS.hasSpacePrefix(), FS.hasPlusPrefix(),
5189 startSpecifier, specifierLen);
5190 if (FS.hasLeadingZeros() && FS.isLeftJustified()) // '0' ignored by '-'
5191 HandleIgnoredFlag(FS, FS.hasLeadingZeros(), FS.isLeftJustified(),
5192 startSpecifier, specifierLen);
5194 // Check the length modifier is valid with the given conversion specifier.
5195 if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo()))
5196 HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
5197 diag::warn_format_nonsensical_length);
5198 else if (!FS.hasStandardLengthModifier())
5199 HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
5200 else if (!FS.hasStandardLengthConversionCombination())
5201 HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
5202 diag::warn_format_non_standard_conversion_spec);
5204 if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
5205 HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
5207 // The remaining checks depend on the data arguments.
5211 if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
5214 const Expr *Arg = getDataArg(argIndex);
5218 return checkFormatExpr(FS, startSpecifier, specifierLen, Arg);
5221 static bool requiresParensToAddCast(const Expr *E) {
5222 // FIXME: We should have a general way to reason about operator
5223 // precedence and whether parens are actually needed here.
5224 // Take care of a few common cases where they aren't.
5225 const Expr *Inside = E->IgnoreImpCasts();
5226 if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(Inside))
5227 Inside = POE->getSyntacticForm()->IgnoreImpCasts();
5229 switch (Inside->getStmtClass()) {
5230 case Stmt::ArraySubscriptExprClass:
5231 case Stmt::CallExprClass:
5232 case Stmt::CharacterLiteralClass:
5233 case Stmt::CXXBoolLiteralExprClass:
5234 case Stmt::DeclRefExprClass:
5235 case Stmt::FloatingLiteralClass:
5236 case Stmt::IntegerLiteralClass:
5237 case Stmt::MemberExprClass:
5238 case Stmt::ObjCArrayLiteralClass:
5239 case Stmt::ObjCBoolLiteralExprClass:
5240 case Stmt::ObjCBoxedExprClass:
5241 case Stmt::ObjCDictionaryLiteralClass:
5242 case Stmt::ObjCEncodeExprClass:
5243 case Stmt::ObjCIvarRefExprClass:
5244 case Stmt::ObjCMessageExprClass:
5245 case Stmt::ObjCPropertyRefExprClass:
5246 case Stmt::ObjCStringLiteralClass:
5247 case Stmt::ObjCSubscriptRefExprClass:
5248 case Stmt::ParenExprClass:
5249 case Stmt::StringLiteralClass:
5250 case Stmt::UnaryOperatorClass:
5257 static std::pair<QualType, StringRef>
5258 shouldNotPrintDirectly(const ASTContext &Context,
5259 QualType IntendedTy,
5261 // Use a 'while' to peel off layers of typedefs.
5262 QualType TyTy = IntendedTy;
5263 while (const TypedefType *UserTy = TyTy->getAs<TypedefType>()) {
5264 StringRef Name = UserTy->getDecl()->getName();
5265 QualType CastTy = llvm::StringSwitch<QualType>(Name)
5266 .Case("NSInteger", Context.LongTy)
5267 .Case("NSUInteger", Context.UnsignedLongTy)
5268 .Case("SInt32", Context.IntTy)
5269 .Case("UInt32", Context.UnsignedIntTy)
5270 .Default(QualType());
5272 if (!CastTy.isNull())
5273 return std::make_pair(CastTy, Name);
5275 TyTy = UserTy->desugar();
5278 // Strip parens if necessary.
5279 if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
5280 return shouldNotPrintDirectly(Context,
5281 PE->getSubExpr()->getType(),
5284 // If this is a conditional expression, then its result type is constructed
5285 // via usual arithmetic conversions and thus there might be no necessary
5286 // typedef sugar there. Recurse to operands to check for NSInteger &
5287 // Co. usage condition.
5288 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
5289 QualType TrueTy, FalseTy;
5290 StringRef TrueName, FalseName;
5292 std::tie(TrueTy, TrueName) =
5293 shouldNotPrintDirectly(Context,
5294 CO->getTrueExpr()->getType(),
5296 std::tie(FalseTy, FalseName) =
5297 shouldNotPrintDirectly(Context,
5298 CO->getFalseExpr()->getType(),
5299 CO->getFalseExpr());
5301 if (TrueTy == FalseTy)
5302 return std::make_pair(TrueTy, TrueName);
5303 else if (TrueTy.isNull())
5304 return std::make_pair(FalseTy, FalseName);
5305 else if (FalseTy.isNull())
5306 return std::make_pair(TrueTy, TrueName);
5309 return std::make_pair(QualType(), StringRef());
5313 CheckPrintfHandler::checkFormatExpr(const analyze_printf::PrintfSpecifier &FS,
5314 const char *StartSpecifier,
5315 unsigned SpecifierLen,
5317 using namespace analyze_format_string;
5318 using namespace analyze_printf;
5319 // Now type check the data expression that matches the
5320 // format specifier.
5321 const analyze_printf::ArgType &AT = FS.getArgType(S.Context,
5326 QualType ExprTy = E->getType();
5327 while (const TypeOfExprType *TET = dyn_cast<TypeOfExprType>(ExprTy)) {
5328 ExprTy = TET->getUnderlyingExpr()->getType();
5331 analyze_printf::ArgType::MatchKind match = AT.matchesType(S.Context, ExprTy);
5333 if (match == analyze_printf::ArgType::Match) {
5337 // Look through argument promotions for our error message's reported type.
5338 // This includes the integral and floating promotions, but excludes array
5339 // and function pointer decay; seeing that an argument intended to be a
5340 // string has type 'char [6]' is probably more confusing than 'char *'.
5341 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
5342 if (ICE->getCastKind() == CK_IntegralCast ||
5343 ICE->getCastKind() == CK_FloatingCast) {
5344 E = ICE->getSubExpr();
5345 ExprTy = E->getType();
5347 // Check if we didn't match because of an implicit cast from a 'char'
5348 // or 'short' to an 'int'. This is done because printf is a varargs
5350 if (ICE->getType() == S.Context.IntTy ||
5351 ICE->getType() == S.Context.UnsignedIntTy) {
5352 // All further checking is done on the subexpression.
5353 if (AT.matchesType(S.Context, ExprTy))
5357 } else if (const CharacterLiteral *CL = dyn_cast<CharacterLiteral>(E)) {
5358 // Special case for 'a', which has type 'int' in C.
5359 // Note, however, that we do /not/ want to treat multibyte constants like
5360 // 'MooV' as characters! This form is deprecated but still exists.
5361 if (ExprTy == S.Context.IntTy)
5362 if (llvm::isUIntN(S.Context.getCharWidth(), CL->getValue()))
5363 ExprTy = S.Context.CharTy;
5366 // Look through enums to their underlying type.
5367 bool IsEnum = false;
5368 if (auto EnumTy = ExprTy->getAs<EnumType>()) {
5369 ExprTy = EnumTy->getDecl()->getIntegerType();
5373 // %C in an Objective-C context prints a unichar, not a wchar_t.
5374 // If the argument is an integer of some kind, believe the %C and suggest
5375 // a cast instead of changing the conversion specifier.
5376 QualType IntendedTy = ExprTy;
5378 FS.getConversionSpecifier().getKind() == ConversionSpecifier::CArg) {
5379 if (ExprTy->isIntegralOrUnscopedEnumerationType() &&
5380 !ExprTy->isCharType()) {
5381 // 'unichar' is defined as a typedef of unsigned short, but we should
5382 // prefer using the typedef if it is visible.
5383 IntendedTy = S.Context.UnsignedShortTy;
5385 // While we are here, check if the value is an IntegerLiteral that happens
5386 // to be within the valid range.
5387 if (const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(E)) {
5388 const llvm::APInt &V = IL->getValue();
5389 if (V.getActiveBits() <= S.Context.getTypeSize(IntendedTy))
5393 LookupResult Result(S, &S.Context.Idents.get("unichar"), E->getLocStart(),
5394 Sema::LookupOrdinaryName);
5395 if (S.LookupName(Result, S.getCurScope())) {
5396 NamedDecl *ND = Result.getFoundDecl();
5397 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND))
5398 if (TD->getUnderlyingType() == IntendedTy)
5399 IntendedTy = S.Context.getTypedefType(TD);
5404 // Special-case some of Darwin's platform-independence types by suggesting
5405 // casts to primitive types that are known to be large enough.
5406 bool ShouldNotPrintDirectly = false; StringRef CastTyName;
5407 if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
5409 std::tie(CastTy, CastTyName) = shouldNotPrintDirectly(S.Context, IntendedTy, E);
5410 if (!CastTy.isNull()) {
5411 IntendedTy = CastTy;
5412 ShouldNotPrintDirectly = true;
5416 // We may be able to offer a FixItHint if it is a supported type.
5417 PrintfSpecifier fixedFS = FS;
5418 bool success = fixedFS.fixType(IntendedTy, S.getLangOpts(),
5419 S.Context, ObjCContext);
5422 // Get the fix string from the fixed format specifier
5423 SmallString<16> buf;
5424 llvm::raw_svector_ostream os(buf);
5425 fixedFS.toString(os);
5427 CharSourceRange SpecRange = getSpecifierRange(StartSpecifier, SpecifierLen);
5429 if (IntendedTy == ExprTy && !ShouldNotPrintDirectly) {
5430 unsigned diag = diag::warn_format_conversion_argument_type_mismatch;
5431 if (match == analyze_format_string::ArgType::NoMatchPedantic) {
5432 diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
5434 // In this case, the specifier is wrong and should be changed to match
5436 EmitFormatDiagnostic(S.PDiag(diag)
5437 << AT.getRepresentativeTypeName(S.Context)
5438 << IntendedTy << IsEnum << E->getSourceRange(),
5440 /*IsStringLocation*/ false, SpecRange,
5441 FixItHint::CreateReplacement(SpecRange, os.str()));
5443 // The canonical type for formatting this value is different from the
5444 // actual type of the expression. (This occurs, for example, with Darwin's
5445 // NSInteger on 32-bit platforms, where it is typedef'd as 'int', but
5446 // should be printed as 'long' for 64-bit compatibility.)
5447 // Rather than emitting a normal format/argument mismatch, we want to
5448 // add a cast to the recommended type (and correct the format string
5450 SmallString<16> CastBuf;
5451 llvm::raw_svector_ostream CastFix(CastBuf);
5453 IntendedTy.print(CastFix, S.Context.getPrintingPolicy());
5456 SmallVector<FixItHint,4> Hints;
5457 if (!AT.matchesType(S.Context, IntendedTy))
5458 Hints.push_back(FixItHint::CreateReplacement(SpecRange, os.str()));
5460 if (const CStyleCastExpr *CCast = dyn_cast<CStyleCastExpr>(E)) {
5461 // If there's already a cast present, just replace it.
5462 SourceRange CastRange(CCast->getLParenLoc(), CCast->getRParenLoc());
5463 Hints.push_back(FixItHint::CreateReplacement(CastRange, CastFix.str()));
5465 } else if (!requiresParensToAddCast(E)) {
5466 // If the expression has high enough precedence,
5467 // just write the C-style cast.
5468 Hints.push_back(FixItHint::CreateInsertion(E->getLocStart(),
5471 // Otherwise, add parens around the expression as well as the cast.
5473 Hints.push_back(FixItHint::CreateInsertion(E->getLocStart(),
5476 SourceLocation After = S.getLocForEndOfToken(E->getLocEnd());
5477 Hints.push_back(FixItHint::CreateInsertion(After, ")"));
5480 if (ShouldNotPrintDirectly) {
5481 // The expression has a type that should not be printed directly.
5482 // We extract the name from the typedef because we don't want to show
5483 // the underlying type in the diagnostic.
5485 if (const TypedefType *TypedefTy = dyn_cast<TypedefType>(ExprTy))
5486 Name = TypedefTy->getDecl()->getName();
5489 EmitFormatDiagnostic(S.PDiag(diag::warn_format_argument_needs_cast)
5490 << Name << IntendedTy << IsEnum
5491 << E->getSourceRange(),
5492 E->getLocStart(), /*IsStringLocation=*/false,
5495 // In this case, the expression could be printed using a different
5496 // specifier, but we've decided that the specifier is probably correct
5497 // and we should cast instead. Just use the normal warning message.
5498 EmitFormatDiagnostic(
5499 S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
5500 << AT.getRepresentativeTypeName(S.Context) << ExprTy << IsEnum
5501 << E->getSourceRange(),
5502 E->getLocStart(), /*IsStringLocation*/false,
5507 const CharSourceRange &CSR = getSpecifierRange(StartSpecifier,
5509 // Since the warning for passing non-POD types to variadic functions
5510 // was deferred until now, we emit a warning for non-POD
5512 switch (S.isValidVarArgType(ExprTy)) {
5513 case Sema::VAK_Valid:
5514 case Sema::VAK_ValidInCXX11: {
5515 unsigned diag = diag::warn_format_conversion_argument_type_mismatch;
5516 if (match == analyze_printf::ArgType::NoMatchPedantic) {
5517 diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
5520 EmitFormatDiagnostic(
5521 S.PDiag(diag) << AT.getRepresentativeTypeName(S.Context) << ExprTy
5522 << IsEnum << CSR << E->getSourceRange(),
5523 E->getLocStart(), /*IsStringLocation*/ false, CSR);
5526 case Sema::VAK_Undefined:
5527 case Sema::VAK_MSVCUndefined:
5528 EmitFormatDiagnostic(
5529 S.PDiag(diag::warn_non_pod_vararg_with_format_string)
5530 << S.getLangOpts().CPlusPlus11
5533 << AT.getRepresentativeTypeName(S.Context)
5535 << E->getSourceRange(),
5536 E->getLocStart(), /*IsStringLocation*/false, CSR);
5537 checkForCStrMembers(AT, E);
5540 case Sema::VAK_Invalid:
5541 if (ExprTy->isObjCObjectType())
5542 EmitFormatDiagnostic(
5543 S.PDiag(diag::err_cannot_pass_objc_interface_to_vararg_format)
5544 << S.getLangOpts().CPlusPlus11
5547 << AT.getRepresentativeTypeName(S.Context)
5549 << E->getSourceRange(),
5550 E->getLocStart(), /*IsStringLocation*/false, CSR);
5552 // FIXME: If this is an initializer list, suggest removing the braces
5553 // or inserting a cast to the target type.
5554 S.Diag(E->getLocStart(), diag::err_cannot_pass_to_vararg_format)
5555 << isa<InitListExpr>(E) << ExprTy << CallType
5556 << AT.getRepresentativeTypeName(S.Context)
5557 << E->getSourceRange();
5561 assert(FirstDataArg + FS.getArgIndex() < CheckedVarArgs.size() &&
5562 "format string specifier index out of range");
5563 CheckedVarArgs[FirstDataArg + FS.getArgIndex()] = true;
5569 //===--- CHECK: Scanf format string checking ------------------------------===//
5572 class CheckScanfHandler : public CheckFormatHandler {
5574 CheckScanfHandler(Sema &s, const StringLiteral *fexpr,
5575 const Expr *origFormatExpr, unsigned firstDataArg,
5576 unsigned numDataArgs, const char *beg, bool hasVAListArg,
5577 ArrayRef<const Expr *> Args,
5578 unsigned formatIdx, bool inFunctionCall,
5579 Sema::VariadicCallType CallType,
5580 llvm::SmallBitVector &CheckedVarArgs,
5581 UncoveredArgHandler &UncoveredArg)
5582 : CheckFormatHandler(s, fexpr, origFormatExpr, firstDataArg,
5583 numDataArgs, beg, hasVAListArg,
5584 Args, formatIdx, inFunctionCall, CallType,
5585 CheckedVarArgs, UncoveredArg)
5588 bool HandleScanfSpecifier(const analyze_scanf::ScanfSpecifier &FS,
5589 const char *startSpecifier,
5590 unsigned specifierLen) override;
5592 bool HandleInvalidScanfConversionSpecifier(
5593 const analyze_scanf::ScanfSpecifier &FS,
5594 const char *startSpecifier,
5595 unsigned specifierLen) override;
5597 void HandleIncompleteScanList(const char *start, const char *end) override;
5599 } // end anonymous namespace
5601 void CheckScanfHandler::HandleIncompleteScanList(const char *start,
5603 EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_scanlist_incomplete),
5604 getLocationOfByte(end), /*IsStringLocation*/true,
5605 getSpecifierRange(start, end - start));
5608 bool CheckScanfHandler::HandleInvalidScanfConversionSpecifier(
5609 const analyze_scanf::ScanfSpecifier &FS,
5610 const char *startSpecifier,
5611 unsigned specifierLen) {
5613 const analyze_scanf::ScanfConversionSpecifier &CS =
5614 FS.getConversionSpecifier();
5616 return HandleInvalidConversionSpecifier(FS.getArgIndex(),
5617 getLocationOfByte(CS.getStart()),
5618 startSpecifier, specifierLen,
5619 CS.getStart(), CS.getLength());
5622 bool CheckScanfHandler::HandleScanfSpecifier(
5623 const analyze_scanf::ScanfSpecifier &FS,
5624 const char *startSpecifier,
5625 unsigned specifierLen) {
5626 using namespace analyze_scanf;
5627 using namespace analyze_format_string;
5629 const ScanfConversionSpecifier &CS = FS.getConversionSpecifier();
5631 // Handle case where '%' and '*' don't consume an argument. These shouldn't
5632 // be used to decide if we are using positional arguments consistently.
5633 if (FS.consumesDataArgument()) {
5636 usesPositionalArgs = FS.usesPositionalArg();
5638 else if (usesPositionalArgs != FS.usesPositionalArg()) {
5639 HandlePositionalNonpositionalArgs(getLocationOfByte(CS.getStart()),
5640 startSpecifier, specifierLen);
5645 // Check if the field with is non-zero.
5646 const OptionalAmount &Amt = FS.getFieldWidth();
5647 if (Amt.getHowSpecified() == OptionalAmount::Constant) {
5648 if (Amt.getConstantAmount() == 0) {
5649 const CharSourceRange &R = getSpecifierRange(Amt.getStart(),
5650 Amt.getConstantLength());
5651 EmitFormatDiagnostic(S.PDiag(diag::warn_scanf_nonzero_width),
5652 getLocationOfByte(Amt.getStart()),
5653 /*IsStringLocation*/true, R,
5654 FixItHint::CreateRemoval(R));
5658 if (!FS.consumesDataArgument()) {
5659 // FIXME: Technically specifying a precision or field width here
5660 // makes no sense. Worth issuing a warning at some point.
5664 // Consume the argument.
5665 unsigned argIndex = FS.getArgIndex();
5666 if (argIndex < NumDataArgs) {
5667 // The check to see if the argIndex is valid will come later.
5668 // We set the bit here because we may exit early from this
5669 // function if we encounter some other error.
5670 CoveredArgs.set(argIndex);
5673 // Check the length modifier is valid with the given conversion specifier.
5674 if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo()))
5675 HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
5676 diag::warn_format_nonsensical_length);
5677 else if (!FS.hasStandardLengthModifier())
5678 HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
5679 else if (!FS.hasStandardLengthConversionCombination())
5680 HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
5681 diag::warn_format_non_standard_conversion_spec);
5683 if (!FS.hasStandardConversionSpecifier(S.getLangOpts()))
5684 HandleNonStandardConversionSpecifier(CS, startSpecifier, specifierLen);
5686 // The remaining checks depend on the data arguments.
5690 if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex))
5693 // Check that the argument type matches the format specifier.
5694 const Expr *Ex = getDataArg(argIndex);
5698 const analyze_format_string::ArgType &AT = FS.getArgType(S.Context);
5700 if (!AT.isValid()) {
5704 analyze_format_string::ArgType::MatchKind match =
5705 AT.matchesType(S.Context, Ex->getType());
5706 if (match == analyze_format_string::ArgType::Match) {
5710 ScanfSpecifier fixedFS = FS;
5711 bool success = fixedFS.fixType(Ex->getType(), Ex->IgnoreImpCasts()->getType(),
5712 S.getLangOpts(), S.Context);
5714 unsigned diag = diag::warn_format_conversion_argument_type_mismatch;
5715 if (match == analyze_format_string::ArgType::NoMatchPedantic) {
5716 diag = diag::warn_format_conversion_argument_type_mismatch_pedantic;
5720 // Get the fix string from the fixed format specifier.
5721 SmallString<128> buf;
5722 llvm::raw_svector_ostream os(buf);
5723 fixedFS.toString(os);
5725 EmitFormatDiagnostic(
5726 S.PDiag(diag) << AT.getRepresentativeTypeName(S.Context)
5727 << Ex->getType() << false << Ex->getSourceRange(),
5729 /*IsStringLocation*/ false,
5730 getSpecifierRange(startSpecifier, specifierLen),
5731 FixItHint::CreateReplacement(
5732 getSpecifierRange(startSpecifier, specifierLen), os.str()));
5734 EmitFormatDiagnostic(S.PDiag(diag)
5735 << AT.getRepresentativeTypeName(S.Context)
5736 << Ex->getType() << false << Ex->getSourceRange(),
5738 /*IsStringLocation*/ false,
5739 getSpecifierRange(startSpecifier, specifierLen));
5745 static void CheckFormatString(Sema &S, const StringLiteral *FExpr,
5746 const Expr *OrigFormatExpr,
5747 ArrayRef<const Expr *> Args,
5748 bool HasVAListArg, unsigned format_idx,
5749 unsigned firstDataArg,
5750 Sema::FormatStringType Type,
5751 bool inFunctionCall,
5752 Sema::VariadicCallType CallType,
5753 llvm::SmallBitVector &CheckedVarArgs,
5754 UncoveredArgHandler &UncoveredArg) {
5755 // CHECK: is the format string a wide literal?
5756 if (!FExpr->isAscii() && !FExpr->isUTF8()) {
5757 CheckFormatHandler::EmitFormatDiagnostic(
5758 S, inFunctionCall, Args[format_idx],
5759 S.PDiag(diag::warn_format_string_is_wide_literal), FExpr->getLocStart(),
5760 /*IsStringLocation*/true, OrigFormatExpr->getSourceRange());
5764 // Str - The format string. NOTE: this is NOT null-terminated!
5765 StringRef StrRef = FExpr->getString();
5766 const char *Str = StrRef.data();
5767 // Account for cases where the string literal is truncated in a declaration.
5768 const ConstantArrayType *T =
5769 S.Context.getAsConstantArrayType(FExpr->getType());
5770 assert(T && "String literal not of constant array type!");
5771 size_t TypeSize = T->getSize().getZExtValue();
5772 size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
5773 const unsigned numDataArgs = Args.size() - firstDataArg;
5775 // Emit a warning if the string literal is truncated and does not contain an
5776 // embedded null character.
5777 if (TypeSize <= StrRef.size() &&
5778 StrRef.substr(0, TypeSize).find('\0') == StringRef::npos) {
5779 CheckFormatHandler::EmitFormatDiagnostic(
5780 S, inFunctionCall, Args[format_idx],
5781 S.PDiag(diag::warn_printf_format_string_not_null_terminated),
5782 FExpr->getLocStart(),
5783 /*IsStringLocation=*/true, OrigFormatExpr->getSourceRange());
5787 // CHECK: empty format string?
5788 if (StrLen == 0 && numDataArgs > 0) {
5789 CheckFormatHandler::EmitFormatDiagnostic(
5790 S, inFunctionCall, Args[format_idx],
5791 S.PDiag(diag::warn_empty_format_string), FExpr->getLocStart(),
5792 /*IsStringLocation*/true, OrigFormatExpr->getSourceRange());
5796 if (Type == Sema::FST_Printf || Type == Sema::FST_NSString ||
5797 Type == Sema::FST_FreeBSDKPrintf || Type == Sema::FST_OSTrace) {
5798 CheckPrintfHandler H(S, FExpr, OrigFormatExpr, firstDataArg,
5799 numDataArgs, (Type == Sema::FST_NSString ||
5800 Type == Sema::FST_OSTrace),
5801 Str, HasVAListArg, Args, format_idx,
5802 inFunctionCall, CallType, CheckedVarArgs,
5805 if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
5807 S.Context.getTargetInfo(),
5808 Type == Sema::FST_FreeBSDKPrintf))
5810 } else if (Type == Sema::FST_Scanf) {
5811 CheckScanfHandler H(S, FExpr, OrigFormatExpr, firstDataArg, numDataArgs,
5812 Str, HasVAListArg, Args, format_idx,
5813 inFunctionCall, CallType, CheckedVarArgs,
5816 if (!analyze_format_string::ParseScanfString(H, Str, Str + StrLen,
5818 S.Context.getTargetInfo()))
5820 } // TODO: handle other formats
5823 bool Sema::FormatStringHasSArg(const StringLiteral *FExpr) {
5824 // Str - The format string. NOTE: this is NOT null-terminated!
5825 StringRef StrRef = FExpr->getString();
5826 const char *Str = StrRef.data();
5827 // Account for cases where the string literal is truncated in a declaration.
5828 const ConstantArrayType *T = Context.getAsConstantArrayType(FExpr->getType());
5829 assert(T && "String literal not of constant array type!");
5830 size_t TypeSize = T->getSize().getZExtValue();
5831 size_t StrLen = std::min(std::max(TypeSize, size_t(1)) - 1, StrRef.size());
5832 return analyze_format_string::ParseFormatStringHasSArg(Str, Str + StrLen,
5834 Context.getTargetInfo());
5837 //===--- CHECK: Warn on use of wrong absolute value function. -------------===//
5839 // Returns the related absolute value function that is larger, of 0 if one
5841 static unsigned getLargerAbsoluteValueFunction(unsigned AbsFunction) {
5842 switch (AbsFunction) {
5846 case Builtin::BI__builtin_abs:
5847 return Builtin::BI__builtin_labs;
5848 case Builtin::BI__builtin_labs:
5849 return Builtin::BI__builtin_llabs;
5850 case Builtin::BI__builtin_llabs:
5853 case Builtin::BI__builtin_fabsf:
5854 return Builtin::BI__builtin_fabs;
5855 case Builtin::BI__builtin_fabs:
5856 return Builtin::BI__builtin_fabsl;
5857 case Builtin::BI__builtin_fabsl:
5860 case Builtin::BI__builtin_cabsf:
5861 return Builtin::BI__builtin_cabs;
5862 case Builtin::BI__builtin_cabs:
5863 return Builtin::BI__builtin_cabsl;
5864 case Builtin::BI__builtin_cabsl:
5867 case Builtin::BIabs:
5868 return Builtin::BIlabs;
5869 case Builtin::BIlabs:
5870 return Builtin::BIllabs;
5871 case Builtin::BIllabs:
5874 case Builtin::BIfabsf:
5875 return Builtin::BIfabs;
5876 case Builtin::BIfabs:
5877 return Builtin::BIfabsl;
5878 case Builtin::BIfabsl:
5881 case Builtin::BIcabsf:
5882 return Builtin::BIcabs;
5883 case Builtin::BIcabs:
5884 return Builtin::BIcabsl;
5885 case Builtin::BIcabsl:
5890 // Returns the argument type of the absolute value function.
5891 static QualType getAbsoluteValueArgumentType(ASTContext &Context,
5896 ASTContext::GetBuiltinTypeError Error = ASTContext::GE_None;
5897 QualType BuiltinType = Context.GetBuiltinType(AbsType, Error);
5898 if (Error != ASTContext::GE_None)
5901 const FunctionProtoType *FT = BuiltinType->getAs<FunctionProtoType>();
5905 if (FT->getNumParams() != 1)
5908 return FT->getParamType(0);
5911 // Returns the best absolute value function, or zero, based on type and
5912 // current absolute value function.
5913 static unsigned getBestAbsFunction(ASTContext &Context, QualType ArgType,
5914 unsigned AbsFunctionKind) {
5915 unsigned BestKind = 0;
5916 uint64_t ArgSize = Context.getTypeSize(ArgType);
5917 for (unsigned Kind = AbsFunctionKind; Kind != 0;
5918 Kind = getLargerAbsoluteValueFunction(Kind)) {
5919 QualType ParamType = getAbsoluteValueArgumentType(Context, Kind);
5920 if (Context.getTypeSize(ParamType) >= ArgSize) {
5923 else if (Context.hasSameType(ParamType, ArgType)) {
5932 enum AbsoluteValueKind {
5938 static AbsoluteValueKind getAbsoluteValueKind(QualType T) {
5939 if (T->isIntegralOrEnumerationType())
5941 if (T->isRealFloatingType())
5942 return AVK_Floating;
5943 if (T->isAnyComplexType())
5946 llvm_unreachable("Type not integer, floating, or complex");
5949 // Changes the absolute value function to a different type. Preserves whether
5950 // the function is a builtin.
5951 static unsigned changeAbsFunction(unsigned AbsKind,
5952 AbsoluteValueKind ValueKind) {
5953 switch (ValueKind) {
5958 case Builtin::BI__builtin_fabsf:
5959 case Builtin::BI__builtin_fabs:
5960 case Builtin::BI__builtin_fabsl:
5961 case Builtin::BI__builtin_cabsf:
5962 case Builtin::BI__builtin_cabs:
5963 case Builtin::BI__builtin_cabsl:
5964 return Builtin::BI__builtin_abs;
5965 case Builtin::BIfabsf:
5966 case Builtin::BIfabs:
5967 case Builtin::BIfabsl:
5968 case Builtin::BIcabsf:
5969 case Builtin::BIcabs:
5970 case Builtin::BIcabsl:
5971 return Builtin::BIabs;
5977 case Builtin::BI__builtin_abs:
5978 case Builtin::BI__builtin_labs:
5979 case Builtin::BI__builtin_llabs:
5980 case Builtin::BI__builtin_cabsf:
5981 case Builtin::BI__builtin_cabs:
5982 case Builtin::BI__builtin_cabsl:
5983 return Builtin::BI__builtin_fabsf;
5984 case Builtin::BIabs:
5985 case Builtin::BIlabs:
5986 case Builtin::BIllabs:
5987 case Builtin::BIcabsf:
5988 case Builtin::BIcabs:
5989 case Builtin::BIcabsl:
5990 return Builtin::BIfabsf;
5996 case Builtin::BI__builtin_abs:
5997 case Builtin::BI__builtin_labs:
5998 case Builtin::BI__builtin_llabs:
5999 case Builtin::BI__builtin_fabsf:
6000 case Builtin::BI__builtin_fabs:
6001 case Builtin::BI__builtin_fabsl:
6002 return Builtin::BI__builtin_cabsf;
6003 case Builtin::BIabs:
6004 case Builtin::BIlabs:
6005 case Builtin::BIllabs:
6006 case Builtin::BIfabsf:
6007 case Builtin::BIfabs:
6008 case Builtin::BIfabsl:
6009 return Builtin::BIcabsf;
6012 llvm_unreachable("Unable to convert function");
6015 static unsigned getAbsoluteValueFunctionKind(const FunctionDecl *FDecl) {
6016 const IdentifierInfo *FnInfo = FDecl->getIdentifier();
6020 switch (FDecl->getBuiltinID()) {
6023 case Builtin::BI__builtin_abs:
6024 case Builtin::BI__builtin_fabs:
6025 case Builtin::BI__builtin_fabsf:
6026 case Builtin::BI__builtin_fabsl:
6027 case Builtin::BI__builtin_labs:
6028 case Builtin::BI__builtin_llabs:
6029 case Builtin::BI__builtin_cabs:
6030 case Builtin::BI__builtin_cabsf:
6031 case Builtin::BI__builtin_cabsl:
6032 case Builtin::BIabs:
6033 case Builtin::BIlabs:
6034 case Builtin::BIllabs:
6035 case Builtin::BIfabs:
6036 case Builtin::BIfabsf:
6037 case Builtin::BIfabsl:
6038 case Builtin::BIcabs:
6039 case Builtin::BIcabsf:
6040 case Builtin::BIcabsl:
6041 return FDecl->getBuiltinID();
6043 llvm_unreachable("Unknown Builtin type");
6046 // If the replacement is valid, emit a note with replacement function.
6047 // Additionally, suggest including the proper header if not already included.
6048 static void emitReplacement(Sema &S, SourceLocation Loc, SourceRange Range,
6049 unsigned AbsKind, QualType ArgType) {
6050 bool EmitHeaderHint = true;
6051 const char *HeaderName = nullptr;
6052 const char *FunctionName = nullptr;
6053 if (S.getLangOpts().CPlusPlus && !ArgType->isAnyComplexType()) {
6054 FunctionName = "std::abs";
6055 if (ArgType->isIntegralOrEnumerationType()) {
6056 HeaderName = "cstdlib";
6057 } else if (ArgType->isRealFloatingType()) {
6058 HeaderName = "cmath";
6060 llvm_unreachable("Invalid Type");
6063 // Lookup all std::abs
6064 if (NamespaceDecl *Std = S.getStdNamespace()) {
6065 LookupResult R(S, &S.Context.Idents.get("abs"), Loc, Sema::LookupAnyName);
6066 R.suppressDiagnostics();
6067 S.LookupQualifiedName(R, Std);
6069 for (const auto *I : R) {
6070 const FunctionDecl *FDecl = nullptr;
6071 if (const UsingShadowDecl *UsingD = dyn_cast<UsingShadowDecl>(I)) {
6072 FDecl = dyn_cast<FunctionDecl>(UsingD->getTargetDecl());
6074 FDecl = dyn_cast<FunctionDecl>(I);
6079 // Found std::abs(), check that they are the right ones.
6080 if (FDecl->getNumParams() != 1)
6083 // Check that the parameter type can handle the argument.
6084 QualType ParamType = FDecl->getParamDecl(0)->getType();
6085 if (getAbsoluteValueKind(ArgType) == getAbsoluteValueKind(ParamType) &&
6086 S.Context.getTypeSize(ArgType) <=
6087 S.Context.getTypeSize(ParamType)) {
6088 // Found a function, don't need the header hint.
6089 EmitHeaderHint = false;
6095 FunctionName = S.Context.BuiltinInfo.getName(AbsKind);
6096 HeaderName = S.Context.BuiltinInfo.getHeaderName(AbsKind);
6099 DeclarationName DN(&S.Context.Idents.get(FunctionName));
6100 LookupResult R(S, DN, Loc, Sema::LookupAnyName);
6101 R.suppressDiagnostics();
6102 S.LookupName(R, S.getCurScope());
6104 if (R.isSingleResult()) {
6105 FunctionDecl *FD = dyn_cast<FunctionDecl>(R.getFoundDecl());
6106 if (FD && FD->getBuiltinID() == AbsKind) {
6107 EmitHeaderHint = false;
6111 } else if (!R.empty()) {
6117 S.Diag(Loc, diag::note_replace_abs_function)
6118 << FunctionName << FixItHint::CreateReplacement(Range, FunctionName);
6123 if (!EmitHeaderHint)
6126 S.Diag(Loc, diag::note_include_header_or_declare) << HeaderName
6130 static bool IsFunctionStdAbs(const FunctionDecl *FDecl) {
6134 if (!FDecl->getIdentifier() || !FDecl->getIdentifier()->isStr("abs"))
6137 const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(FDecl->getDeclContext());
6139 while (ND && ND->isInlineNamespace()) {
6140 ND = dyn_cast<NamespaceDecl>(ND->getDeclContext());
6143 if (!ND || !ND->getIdentifier() || !ND->getIdentifier()->isStr("std"))
6146 if (!isa<TranslationUnitDecl>(ND->getDeclContext()))
6152 // Warn when using the wrong abs() function.
6153 void Sema::CheckAbsoluteValueFunction(const CallExpr *Call,
6154 const FunctionDecl *FDecl,
6155 IdentifierInfo *FnInfo) {
6156 if (Call->getNumArgs() != 1)
6159 unsigned AbsKind = getAbsoluteValueFunctionKind(FDecl);
6160 bool IsStdAbs = IsFunctionStdAbs(FDecl);
6161 if (AbsKind == 0 && !IsStdAbs)
6164 QualType ArgType = Call->getArg(0)->IgnoreParenImpCasts()->getType();
6165 QualType ParamType = Call->getArg(0)->getType();
6167 // Unsigned types cannot be negative. Suggest removing the absolute value
6169 if (ArgType->isUnsignedIntegerType()) {
6170 const char *FunctionName =
6171 IsStdAbs ? "std::abs" : Context.BuiltinInfo.getName(AbsKind);
6172 Diag(Call->getExprLoc(), diag::warn_unsigned_abs) << ArgType << ParamType;
6173 Diag(Call->getExprLoc(), diag::note_remove_abs)
6175 << FixItHint::CreateRemoval(Call->getCallee()->getSourceRange());
6179 // Taking the absolute value of a pointer is very suspicious, they probably
6180 // wanted to index into an array, dereference a pointer, call a function, etc.
6181 if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
6182 unsigned DiagType = 0;
6183 if (ArgType->isFunctionType())
6185 else if (ArgType->isArrayType())
6188 Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
6192 // std::abs has overloads which prevent most of the absolute value problems
6197 AbsoluteValueKind ArgValueKind = getAbsoluteValueKind(ArgType);
6198 AbsoluteValueKind ParamValueKind = getAbsoluteValueKind(ParamType);
6200 // The argument and parameter are the same kind. Check if they are the right
6202 if (ArgValueKind == ParamValueKind) {
6203 if (Context.getTypeSize(ArgType) <= Context.getTypeSize(ParamType))
6206 unsigned NewAbsKind = getBestAbsFunction(Context, ArgType, AbsKind);
6207 Diag(Call->getExprLoc(), diag::warn_abs_too_small)
6208 << FDecl << ArgType << ParamType;
6210 if (NewAbsKind == 0)
6213 emitReplacement(*this, Call->getExprLoc(),
6214 Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
6218 // ArgValueKind != ParamValueKind
6219 // The wrong type of absolute value function was used. Attempt to find the
6221 unsigned NewAbsKind = changeAbsFunction(AbsKind, ArgValueKind);
6222 NewAbsKind = getBestAbsFunction(Context, ArgType, NewAbsKind);
6223 if (NewAbsKind == 0)
6226 Diag(Call->getExprLoc(), diag::warn_wrong_absolute_value_type)
6227 << FDecl << ParamValueKind << ArgValueKind;
6229 emitReplacement(*this, Call->getExprLoc(),
6230 Call->getCallee()->getSourceRange(), NewAbsKind, ArgType);
6233 //===--- CHECK: Standard memory functions ---------------------------------===//
6235 /// \brief Takes the expression passed to the size_t parameter of functions
6236 /// such as memcmp, strncat, etc and warns if it's a comparison.
6238 /// This is to catch typos like `if (memcmp(&a, &b, sizeof(a) > 0))`.
6239 static bool CheckMemorySizeofForComparison(Sema &S, const Expr *E,
6240 IdentifierInfo *FnName,
6241 SourceLocation FnLoc,
6242 SourceLocation RParenLoc) {
6243 const BinaryOperator *Size = dyn_cast<BinaryOperator>(E);
6247 // if E is binop and op is >, <, >=, <=, ==, &&, ||:
6248 if (!Size->isComparisonOp() && !Size->isEqualityOp() && !Size->isLogicalOp())
6251 SourceRange SizeRange = Size->getSourceRange();
6252 S.Diag(Size->getOperatorLoc(), diag::warn_memsize_comparison)
6253 << SizeRange << FnName;
6254 S.Diag(FnLoc, diag::note_memsize_comparison_paren)
6255 << FnName << FixItHint::CreateInsertion(
6256 S.getLocForEndOfToken(Size->getLHS()->getLocEnd()), ")")
6257 << FixItHint::CreateRemoval(RParenLoc);
6258 S.Diag(SizeRange.getBegin(), diag::note_memsize_comparison_cast_silence)
6259 << FixItHint::CreateInsertion(SizeRange.getBegin(), "(size_t)(")
6260 << FixItHint::CreateInsertion(S.getLocForEndOfToken(SizeRange.getEnd()),
6266 /// \brief Determine whether the given type is or contains a dynamic class type
6267 /// (e.g., whether it has a vtable).
6268 static const CXXRecordDecl *getContainedDynamicClass(QualType T,
6269 bool &IsContained) {
6270 // Look through array types while ignoring qualifiers.
6271 const Type *Ty = T->getBaseElementTypeUnsafe();
6272 IsContained = false;
6274 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
6275 RD = RD ? RD->getDefinition() : nullptr;
6276 if (!RD || RD->isInvalidDecl())
6279 if (RD->isDynamicClass())
6282 // Check all the fields. If any bases were dynamic, the class is dynamic.
6283 // It's impossible for a class to transitively contain itself by value, so
6284 // infinite recursion is impossible.
6285 for (auto *FD : RD->fields()) {
6287 if (const CXXRecordDecl *ContainedRD =
6288 getContainedDynamicClass(FD->getType(), SubContained)) {
6297 /// \brief If E is a sizeof expression, returns its argument expression,
6298 /// otherwise returns NULL.
6299 static const Expr *getSizeOfExprArg(const Expr *E) {
6300 if (const UnaryExprOrTypeTraitExpr *SizeOf =
6301 dyn_cast<UnaryExprOrTypeTraitExpr>(E))
6302 if (SizeOf->getKind() == clang::UETT_SizeOf && !SizeOf->isArgumentType())
6303 return SizeOf->getArgumentExpr()->IgnoreParenImpCasts();
6308 /// \brief If E is a sizeof expression, returns its argument type.
6309 static QualType getSizeOfArgType(const Expr *E) {
6310 if (const UnaryExprOrTypeTraitExpr *SizeOf =
6311 dyn_cast<UnaryExprOrTypeTraitExpr>(E))
6312 if (SizeOf->getKind() == clang::UETT_SizeOf)
6313 return SizeOf->getTypeOfArgument();
6318 /// \brief Check for dangerous or invalid arguments to memset().
6320 /// This issues warnings on known problematic, dangerous or unspecified
6321 /// arguments to the standard 'memset', 'memcpy', 'memmove', and 'memcmp'
6324 /// \param Call The call expression to diagnose.
6325 void Sema::CheckMemaccessArguments(const CallExpr *Call,
6327 IdentifierInfo *FnName) {
6330 // It is possible to have a non-standard definition of memset. Validate
6331 // we have enough arguments, and if not, abort further checking.
6332 unsigned ExpectedNumArgs = (BId == Builtin::BIstrndup ? 2 : 3);
6333 if (Call->getNumArgs() < ExpectedNumArgs)
6336 unsigned LastArg = (BId == Builtin::BImemset ||
6337 BId == Builtin::BIstrndup ? 1 : 2);
6338 unsigned LenArg = (BId == Builtin::BIstrndup ? 1 : 2);
6339 const Expr *LenExpr = Call->getArg(LenArg)->IgnoreParenImpCasts();
6341 if (CheckMemorySizeofForComparison(*this, LenExpr, FnName,
6342 Call->getLocStart(), Call->getRParenLoc()))
6345 // We have special checking when the length is a sizeof expression.
6346 QualType SizeOfArgTy = getSizeOfArgType(LenExpr);
6347 const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
6348 llvm::FoldingSetNodeID SizeOfArgID;
6350 for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
6351 const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
6352 SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();
6354 QualType DestTy = Dest->getType();
6356 if (const PointerType *DestPtrTy = DestTy->getAs<PointerType>()) {
6357 PointeeTy = DestPtrTy->getPointeeType();
6359 // Never warn about void type pointers. This can be used to suppress
6361 if (PointeeTy->isVoidType())
6364 // Catch "memset(p, 0, sizeof(p))" -- needs to be sizeof(*p). Do this by
6365 // actually comparing the expressions for equality. Because computing the
6366 // expression IDs can be expensive, we only do this if the diagnostic is
6369 !Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess,
6370 SizeOfArg->getExprLoc())) {
6371 // We only compute IDs for expressions if the warning is enabled, and
6372 // cache the sizeof arg's ID.
6373 if (SizeOfArgID == llvm::FoldingSetNodeID())
6374 SizeOfArg->Profile(SizeOfArgID, Context, true);
6375 llvm::FoldingSetNodeID DestID;
6376 Dest->Profile(DestID, Context, true);
6377 if (DestID == SizeOfArgID) {
6378 // TODO: For strncpy() and friends, this could suggest sizeof(dst)
6379 // over sizeof(src) as well.
6380 unsigned ActionIdx = 0; // Default is to suggest dereferencing.
6381 StringRef ReadableName = FnName->getName();
6383 if (const UnaryOperator *UnaryOp = dyn_cast<UnaryOperator>(Dest))
6384 if (UnaryOp->getOpcode() == UO_AddrOf)
6385 ActionIdx = 1; // If its an address-of operator, just remove it.
6386 if (!PointeeTy->isIncompleteType() &&
6387 (Context.getTypeSize(PointeeTy) == Context.getCharWidth()))
6388 ActionIdx = 2; // If the pointee's size is sizeof(char),
6389 // suggest an explicit length.
6391 // If the function is defined as a builtin macro, do not show macro
6393 SourceLocation SL = SizeOfArg->getExprLoc();
6394 SourceRange DSR = Dest->getSourceRange();
6395 SourceRange SSR = SizeOfArg->getSourceRange();
6396 SourceManager &SM = getSourceManager();
6398 if (SM.isMacroArgExpansion(SL)) {
6399 ReadableName = Lexer::getImmediateMacroName(SL, SM, LangOpts);
6400 SL = SM.getSpellingLoc(SL);
6401 DSR = SourceRange(SM.getSpellingLoc(DSR.getBegin()),
6402 SM.getSpellingLoc(DSR.getEnd()));
6403 SSR = SourceRange(SM.getSpellingLoc(SSR.getBegin()),
6404 SM.getSpellingLoc(SSR.getEnd()));
6407 DiagRuntimeBehavior(SL, SizeOfArg,
6408 PDiag(diag::warn_sizeof_pointer_expr_memaccess)
6414 DiagRuntimeBehavior(SL, SizeOfArg,
6415 PDiag(diag::warn_sizeof_pointer_expr_memaccess_note)
6423 // Also check for cases where the sizeof argument is the exact same
6424 // type as the memory argument, and where it points to a user-defined
6426 if (SizeOfArgTy != QualType()) {
6427 if (PointeeTy->isRecordType() &&
6428 Context.typesAreCompatible(SizeOfArgTy, DestTy)) {
6429 DiagRuntimeBehavior(LenExpr->getExprLoc(), Dest,
6430 PDiag(diag::warn_sizeof_pointer_type_memaccess)
6431 << FnName << SizeOfArgTy << ArgIdx
6432 << PointeeTy << Dest->getSourceRange()
6433 << LenExpr->getSourceRange());
6437 } else if (DestTy->isArrayType()) {
6441 if (PointeeTy == QualType())
6444 // Always complain about dynamic classes.
6446 if (const CXXRecordDecl *ContainedRD =
6447 getContainedDynamicClass(PointeeTy, IsContained)) {
6449 unsigned OperationType = 0;
6450 // "overwritten" if we're warning about the destination for any call
6451 // but memcmp; otherwise a verb appropriate to the call.
6452 if (ArgIdx != 0 || BId == Builtin::BImemcmp) {
6453 if (BId == Builtin::BImemcpy)
6455 else if(BId == Builtin::BImemmove)
6457 else if (BId == Builtin::BImemcmp)
6461 DiagRuntimeBehavior(
6462 Dest->getExprLoc(), Dest,
6463 PDiag(diag::warn_dyn_class_memaccess)
6464 << (BId == Builtin::BImemcmp ? ArgIdx + 2 : ArgIdx)
6465 << FnName << IsContained << ContainedRD << OperationType
6466 << Call->getCallee()->getSourceRange());
6467 } else if (PointeeTy.hasNonTrivialObjCLifetime() &&
6468 BId != Builtin::BImemset)
6469 DiagRuntimeBehavior(
6470 Dest->getExprLoc(), Dest,
6471 PDiag(diag::warn_arc_object_memaccess)
6472 << ArgIdx << FnName << PointeeTy
6473 << Call->getCallee()->getSourceRange());
6477 DiagRuntimeBehavior(
6478 Dest->getExprLoc(), Dest,
6479 PDiag(diag::note_bad_memaccess_silence)
6480 << FixItHint::CreateInsertion(ArgRange.getBegin(), "(void*)"));
6485 // A little helper routine: ignore addition and subtraction of integer literals.
6486 // This intentionally does not ignore all integer constant expressions because
6487 // we don't want to remove sizeof().
6488 static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
6489 Ex = Ex->IgnoreParenCasts();
6492 const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
6493 if (!BO || !BO->isAdditiveOp())
6496 const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
6497 const Expr *LHS = BO->getLHS()->IgnoreParenCasts();
6499 if (isa<IntegerLiteral>(RHS))
6501 else if (isa<IntegerLiteral>(LHS))
6510 static bool isConstantSizeArrayWithMoreThanOneElement(QualType Ty,
6511 ASTContext &Context) {
6512 // Only handle constant-sized or VLAs, but not flexible members.
6513 if (const ConstantArrayType *CAT = Context.getAsConstantArrayType(Ty)) {
6514 // Only issue the FIXIT for arrays of size > 1.
6515 if (CAT->getSize().getSExtValue() <= 1)
6517 } else if (!Ty->isVariableArrayType()) {
6523 // Warn if the user has made the 'size' argument to strlcpy or strlcat
6524 // be the size of the source, instead of the destination.
6525 void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
6526 IdentifierInfo *FnName) {
6528 // Don't crash if the user has the wrong number of arguments
6529 unsigned NumArgs = Call->getNumArgs();
6530 if ((NumArgs != 3) && (NumArgs != 4))
6533 const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
6534 const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
6535 const Expr *CompareWithSrc = nullptr;
6537 if (CheckMemorySizeofForComparison(*this, SizeArg, FnName,
6538 Call->getLocStart(), Call->getRParenLoc()))
6541 // Look for 'strlcpy(dst, x, sizeof(x))'
6542 if (const Expr *Ex = getSizeOfExprArg(SizeArg))
6543 CompareWithSrc = Ex;
6545 // Look for 'strlcpy(dst, x, strlen(x))'
6546 if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
6547 if (SizeCall->getBuiltinCallee() == Builtin::BIstrlen &&
6548 SizeCall->getNumArgs() == 1)
6549 CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
6553 if (!CompareWithSrc)
6556 // Determine if the argument to sizeof/strlen is equal to the source
6557 // argument. In principle there's all kinds of things you could do
6558 // here, for instance creating an == expression and evaluating it with
6559 // EvaluateAsBooleanCondition, but this uses a more direct technique:
6560 const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
6564 const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
6565 if (!CompareWithSrcDRE ||
6566 SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
6569 const Expr *OriginalSizeArg = Call->getArg(2);
6570 Diag(CompareWithSrcDRE->getLocStart(), diag::warn_strlcpycat_wrong_size)
6571 << OriginalSizeArg->getSourceRange() << FnName;
6573 // Output a FIXIT hint if the destination is an array (rather than a
6574 // pointer to an array). This could be enhanced to handle some
6575 // pointers if we know the actual size, like if DstArg is 'array+2'
6576 // we could say 'sizeof(array)-2'.
6577 const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
6578 if (!isConstantSizeArrayWithMoreThanOneElement(DstArg->getType(), Context))
6581 SmallString<128> sizeString;
6582 llvm::raw_svector_ostream OS(sizeString);
6584 DstArg->printPretty(OS, nullptr, getPrintingPolicy());
6587 Diag(OriginalSizeArg->getLocStart(), diag::note_strlcpycat_wrong_size)
6588 << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
6592 /// Check if two expressions refer to the same declaration.
6593 static bool referToTheSameDecl(const Expr *E1, const Expr *E2) {
6594 if (const DeclRefExpr *D1 = dyn_cast_or_null<DeclRefExpr>(E1))
6595 if (const DeclRefExpr *D2 = dyn_cast_or_null<DeclRefExpr>(E2))
6596 return D1->getDecl() == D2->getDecl();
6600 static const Expr *getStrlenExprArg(const Expr *E) {
6601 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) {
6602 const FunctionDecl *FD = CE->getDirectCallee();
6603 if (!FD || FD->getMemoryFunctionKind() != Builtin::BIstrlen)
6605 return CE->getArg(0)->IgnoreParenCasts();
6610 // Warn on anti-patterns as the 'size' argument to strncat.
6611 // The correct size argument should look like following:
6612 // strncat(dst, src, sizeof(dst) - strlen(dest) - 1);
6613 void Sema::CheckStrncatArguments(const CallExpr *CE,
6614 IdentifierInfo *FnName) {
6615 // Don't crash if the user has the wrong number of arguments.
6616 if (CE->getNumArgs() < 3)
6618 const Expr *DstArg = CE->getArg(0)->IgnoreParenCasts();
6619 const Expr *SrcArg = CE->getArg(1)->IgnoreParenCasts();
6620 const Expr *LenArg = CE->getArg(2)->IgnoreParenCasts();
6622 if (CheckMemorySizeofForComparison(*this, LenArg, FnName, CE->getLocStart(),
6623 CE->getRParenLoc()))
6626 // Identify common expressions, which are wrongly used as the size argument
6627 // to strncat and may lead to buffer overflows.
6628 unsigned PatternType = 0;
6629 if (const Expr *SizeOfArg = getSizeOfExprArg(LenArg)) {
6631 if (referToTheSameDecl(SizeOfArg, DstArg))
6634 else if (referToTheSameDecl(SizeOfArg, SrcArg))
6636 } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(LenArg)) {
6637 if (BE->getOpcode() == BO_Sub) {
6638 const Expr *L = BE->getLHS()->IgnoreParenCasts();
6639 const Expr *R = BE->getRHS()->IgnoreParenCasts();
6640 // - sizeof(dst) - strlen(dst)
6641 if (referToTheSameDecl(DstArg, getSizeOfExprArg(L)) &&
6642 referToTheSameDecl(DstArg, getStrlenExprArg(R)))
6644 // - sizeof(src) - (anything)
6645 else if (referToTheSameDecl(SrcArg, getSizeOfExprArg(L)))
6650 if (PatternType == 0)
6653 // Generate the diagnostic.
6654 SourceLocation SL = LenArg->getLocStart();
6655 SourceRange SR = LenArg->getSourceRange();
6656 SourceManager &SM = getSourceManager();
6658 // If the function is defined as a builtin macro, do not show macro expansion.
6659 if (SM.isMacroArgExpansion(SL)) {
6660 SL = SM.getSpellingLoc(SL);
6661 SR = SourceRange(SM.getSpellingLoc(SR.getBegin()),
6662 SM.getSpellingLoc(SR.getEnd()));
6665 // Check if the destination is an array (rather than a pointer to an array).
6666 QualType DstTy = DstArg->getType();
6667 bool isKnownSizeArray = isConstantSizeArrayWithMoreThanOneElement(DstTy,
6669 if (!isKnownSizeArray) {
6670 if (PatternType == 1)
6671 Diag(SL, diag::warn_strncat_wrong_size) << SR;
6673 Diag(SL, diag::warn_strncat_src_size) << SR;
6677 if (PatternType == 1)
6678 Diag(SL, diag::warn_strncat_large_size) << SR;
6680 Diag(SL, diag::warn_strncat_src_size) << SR;
6682 SmallString<128> sizeString;
6683 llvm::raw_svector_ostream OS(sizeString);
6685 DstArg->printPretty(OS, nullptr, getPrintingPolicy());
6688 DstArg->printPretty(OS, nullptr, getPrintingPolicy());
6691 Diag(SL, diag::note_strncat_wrong_size)
6692 << FixItHint::CreateReplacement(SR, OS.str());
6695 //===--- CHECK: Return Address of Stack Variable --------------------------===//
6697 static const Expr *EvalVal(const Expr *E,
6698 SmallVectorImpl<const DeclRefExpr *> &refVars,
6699 const Decl *ParentDecl);
6700 static const Expr *EvalAddr(const Expr *E,
6701 SmallVectorImpl<const DeclRefExpr *> &refVars,
6702 const Decl *ParentDecl);
6704 /// CheckReturnStackAddr - Check if a return statement returns the address
6705 /// of a stack variable.
6707 CheckReturnStackAddr(Sema &S, Expr *RetValExp, QualType lhsType,
6708 SourceLocation ReturnLoc) {
6710 const Expr *stackE = nullptr;
6711 SmallVector<const DeclRefExpr *, 8> refVars;
6713 // Perform checking for returned stack addresses, local blocks,
6714 // label addresses or references to temporaries.
6715 if (lhsType->isPointerType() ||
6716 (!S.getLangOpts().ObjCAutoRefCount && lhsType->isBlockPointerType())) {
6717 stackE = EvalAddr(RetValExp, refVars, /*ParentDecl=*/nullptr);
6718 } else if (lhsType->isReferenceType()) {
6719 stackE = EvalVal(RetValExp, refVars, /*ParentDecl=*/nullptr);
6723 return; // Nothing suspicious was found.
6725 // Parameters are initalized in the calling scope, so taking the address
6726 // of a parameter reference doesn't need a warning.
6727 for (auto *DRE : refVars)
6728 if (isa<ParmVarDecl>(DRE->getDecl()))
6731 SourceLocation diagLoc;
6732 SourceRange diagRange;
6733 if (refVars.empty()) {
6734 diagLoc = stackE->getLocStart();
6735 diagRange = stackE->getSourceRange();
6737 // We followed through a reference variable. 'stackE' contains the
6738 // problematic expression but we will warn at the return statement pointing
6739 // at the reference variable. We will later display the "trail" of
6740 // reference variables using notes.
6741 diagLoc = refVars[0]->getLocStart();
6742 diagRange = refVars[0]->getSourceRange();
6745 if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(stackE)) {
6746 // address of local var
6747 S.Diag(diagLoc, diag::warn_ret_stack_addr_ref) << lhsType->isReferenceType()
6748 << DR->getDecl()->getDeclName() << diagRange;
6749 } else if (isa<BlockExpr>(stackE)) { // local block.
6750 S.Diag(diagLoc, diag::err_ret_local_block) << diagRange;
6751 } else if (isa<AddrLabelExpr>(stackE)) { // address of label.
6752 S.Diag(diagLoc, diag::warn_ret_addr_label) << diagRange;
6753 } else { // local temporary.
6754 // If there is an LValue->RValue conversion, then the value of the
6755 // reference type is used, not the reference.
6756 if (auto *ICE = dyn_cast<ImplicitCastExpr>(RetValExp)) {
6757 if (ICE->getCastKind() == CK_LValueToRValue) {
6761 S.Diag(diagLoc, diag::warn_ret_local_temp_addr_ref)
6762 << lhsType->isReferenceType() << diagRange;
6765 // Display the "trail" of reference variables that we followed until we
6766 // found the problematic expression using notes.
6767 for (unsigned i = 0, e = refVars.size(); i != e; ++i) {
6768 const VarDecl *VD = cast<VarDecl>(refVars[i]->getDecl());
6769 // If this var binds to another reference var, show the range of the next
6770 // var, otherwise the var binds to the problematic expression, in which case
6771 // show the range of the expression.
6772 SourceRange range = (i < e - 1) ? refVars[i + 1]->getSourceRange()
6773 : stackE->getSourceRange();
6774 S.Diag(VD->getLocation(), diag::note_ref_var_local_bind)
6775 << VD->getDeclName() << range;
6779 /// EvalAddr - EvalAddr and EvalVal are mutually recursive functions that
6780 /// check if the expression in a return statement evaluates to an address
6781 /// to a location on the stack, a local block, an address of a label, or a
6782 /// reference to local temporary. The recursion is used to traverse the
6783 /// AST of the return expression, with recursion backtracking when we
6784 /// encounter a subexpression that (1) clearly does not lead to one of the
6785 /// above problematic expressions (2) is something we cannot determine leads to
6786 /// a problematic expression based on such local checking.
6788 /// Both EvalAddr and EvalVal follow through reference variables to evaluate
6789 /// the expression that they point to. Such variables are added to the
6790 /// 'refVars' vector so that we know what the reference variable "trail" was.
6792 /// EvalAddr processes expressions that are pointers that are used as
6793 /// references (and not L-values). EvalVal handles all other values.
6794 /// At the base case of the recursion is a check for the above problematic
6797 /// This implementation handles:
6799 /// * pointer-to-pointer casts
6800 /// * implicit conversions from array references to pointers
6801 /// * taking the address of fields
6802 /// * arbitrary interplay between "&" and "*" operators
6803 /// * pointer arithmetic from an address of a stack variable
6804 /// * taking the address of an array element where the array is on the stack
6805 static const Expr *EvalAddr(const Expr *E,
6806 SmallVectorImpl<const DeclRefExpr *> &refVars,
6807 const Decl *ParentDecl) {
6808 if (E->isTypeDependent())
6811 // We should only be called for evaluating pointer expressions.
6812 assert((E->getType()->isAnyPointerType() ||
6813 E->getType()->isBlockPointerType() ||
6814 E->getType()->isObjCQualifiedIdType()) &&
6815 "EvalAddr only works on pointers");
6817 E = E->IgnoreParens();
6819 // Our "symbolic interpreter" is just a dispatch off the currently
6820 // viewed AST node. We then recursively traverse the AST by calling
6821 // EvalAddr and EvalVal appropriately.
6822 switch (E->getStmtClass()) {
6823 case Stmt::DeclRefExprClass: {
6824 const DeclRefExpr *DR = cast<DeclRefExpr>(E);
6826 // If we leave the immediate function, the lifetime isn't about to end.
6827 if (DR->refersToEnclosingVariableOrCapture())
6830 if (const VarDecl *V = dyn_cast<VarDecl>(DR->getDecl()))
6831 // If this is a reference variable, follow through to the expression that
6833 if (V->hasLocalStorage() &&
6834 V->getType()->isReferenceType() && V->hasInit()) {
6835 // Add the reference variable to the "trail".
6836 refVars.push_back(DR);
6837 return EvalAddr(V->getInit(), refVars, ParentDecl);
6843 case Stmt::UnaryOperatorClass: {
6844 // The only unary operator that make sense to handle here
6845 // is AddrOf. All others don't make sense as pointers.
6846 const UnaryOperator *U = cast<UnaryOperator>(E);
6848 if (U->getOpcode() == UO_AddrOf)
6849 return EvalVal(U->getSubExpr(), refVars, ParentDecl);
6853 case Stmt::BinaryOperatorClass: {
6854 // Handle pointer arithmetic. All other binary operators are not valid
6856 const BinaryOperator *B = cast<BinaryOperator>(E);
6857 BinaryOperatorKind op = B->getOpcode();
6859 if (op != BO_Add && op != BO_Sub)
6862 const Expr *Base = B->getLHS();
6864 // Determine which argument is the real pointer base. It could be
6865 // the RHS argument instead of the LHS.
6866 if (!Base->getType()->isPointerType())
6869 assert(Base->getType()->isPointerType());
6870 return EvalAddr(Base, refVars, ParentDecl);
6873 // For conditional operators we need to see if either the LHS or RHS are
6874 // valid DeclRefExpr*s. If one of them is valid, we return it.
6875 case Stmt::ConditionalOperatorClass: {
6876 const ConditionalOperator *C = cast<ConditionalOperator>(E);
6878 // Handle the GNU extension for missing LHS.
6879 // FIXME: That isn't a ConditionalOperator, so doesn't get here.
6880 if (const Expr *LHSExpr = C->getLHS()) {
6881 // In C++, we can have a throw-expression, which has 'void' type.
6882 if (!LHSExpr->getType()->isVoidType())
6883 if (const Expr *LHS = EvalAddr(LHSExpr, refVars, ParentDecl))
6887 // In C++, we can have a throw-expression, which has 'void' type.
6888 if (C->getRHS()->getType()->isVoidType())
6891 return EvalAddr(C->getRHS(), refVars, ParentDecl);
6894 case Stmt::BlockExprClass:
6895 if (cast<BlockExpr>(E)->getBlockDecl()->hasCaptures())
6896 return E; // local block.
6899 case Stmt::AddrLabelExprClass:
6900 return E; // address of label.
6902 case Stmt::ExprWithCleanupsClass:
6903 return EvalAddr(cast<ExprWithCleanups>(E)->getSubExpr(), refVars,
6906 // For casts, we need to handle conversions from arrays to
6907 // pointer values, and pointer-to-pointer conversions.
6908 case Stmt::ImplicitCastExprClass:
6909 case Stmt::CStyleCastExprClass:
6910 case Stmt::CXXFunctionalCastExprClass:
6911 case Stmt::ObjCBridgedCastExprClass:
6912 case Stmt::CXXStaticCastExprClass:
6913 case Stmt::CXXDynamicCastExprClass:
6914 case Stmt::CXXConstCastExprClass:
6915 case Stmt::CXXReinterpretCastExprClass: {
6916 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr();
6917 switch (cast<CastExpr>(E)->getCastKind()) {
6918 case CK_LValueToRValue:
6920 case CK_BaseToDerived:
6921 case CK_DerivedToBase:
6922 case CK_UncheckedDerivedToBase:
6924 case CK_CPointerToObjCPointerCast:
6925 case CK_BlockPointerToObjCPointerCast:
6926 case CK_AnyPointerToBlockPointerCast:
6927 return EvalAddr(SubExpr, refVars, ParentDecl);
6929 case CK_ArrayToPointerDecay:
6930 return EvalVal(SubExpr, refVars, ParentDecl);
6933 if (SubExpr->getType()->isAnyPointerType() ||
6934 SubExpr->getType()->isBlockPointerType() ||
6935 SubExpr->getType()->isObjCQualifiedIdType())
6936 return EvalAddr(SubExpr, refVars, ParentDecl);
6945 case Stmt::MaterializeTemporaryExprClass:
6946 if (const Expr *Result =
6947 EvalAddr(cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr(),
6948 refVars, ParentDecl))
6952 // Everything else: we simply don't reason about them.
6958 /// EvalVal - This function is complements EvalAddr in the mutual recursion.
6959 /// See the comments for EvalAddr for more details.
6960 static const Expr *EvalVal(const Expr *E,
6961 SmallVectorImpl<const DeclRefExpr *> &refVars,
6962 const Decl *ParentDecl) {
6964 // We should only be called for evaluating non-pointer expressions, or
6965 // expressions with a pointer type that are not used as references but
6967 // are l-values (e.g., DeclRefExpr with a pointer type).
6969 // Our "symbolic interpreter" is just a dispatch off the currently
6970 // viewed AST node. We then recursively traverse the AST by calling
6971 // EvalAddr and EvalVal appropriately.
6973 E = E->IgnoreParens();
6974 switch (E->getStmtClass()) {
6975 case Stmt::ImplicitCastExprClass: {
6976 const ImplicitCastExpr *IE = cast<ImplicitCastExpr>(E);
6977 if (IE->getValueKind() == VK_LValue) {
6978 E = IE->getSubExpr();
6984 case Stmt::ExprWithCleanupsClass:
6985 return EvalVal(cast<ExprWithCleanups>(E)->getSubExpr(), refVars,
6988 case Stmt::DeclRefExprClass: {
6989 // When we hit a DeclRefExpr we are looking at code that refers to a
6990 // variable's name. If it's not a reference variable we check if it has
6991 // local storage within the function, and if so, return the expression.
6992 const DeclRefExpr *DR = cast<DeclRefExpr>(E);
6994 // If we leave the immediate function, the lifetime isn't about to end.
6995 if (DR->refersToEnclosingVariableOrCapture())
6998 if (const VarDecl *V = dyn_cast<VarDecl>(DR->getDecl())) {
6999 // Check if it refers to itself, e.g. "int& i = i;".
7000 if (V == ParentDecl)
7003 if (V->hasLocalStorage()) {
7004 if (!V->getType()->isReferenceType())
7007 // Reference variable, follow through to the expression that
7010 // Add the reference variable to the "trail".
7011 refVars.push_back(DR);
7012 return EvalVal(V->getInit(), refVars, V);
7020 case Stmt::UnaryOperatorClass: {
7021 // The only unary operator that make sense to handle here
7022 // is Deref. All others don't resolve to a "name." This includes
7023 // handling all sorts of rvalues passed to a unary operator.
7024 const UnaryOperator *U = cast<UnaryOperator>(E);
7026 if (U->getOpcode() == UO_Deref)
7027 return EvalAddr(U->getSubExpr(), refVars, ParentDecl);
7032 case Stmt::ArraySubscriptExprClass: {
7033 // Array subscripts are potential references to data on the stack. We
7034 // retrieve the DeclRefExpr* for the array variable if it indeed
7035 // has local storage.
7036 const auto *ASE = cast<ArraySubscriptExpr>(E);
7037 if (ASE->isTypeDependent())
7039 return EvalAddr(ASE->getBase(), refVars, ParentDecl);
7042 case Stmt::OMPArraySectionExprClass: {
7043 return EvalAddr(cast<OMPArraySectionExpr>(E)->getBase(), refVars,
7047 case Stmt::ConditionalOperatorClass: {
7048 // For conditional operators we need to see if either the LHS or RHS are
7049 // non-NULL Expr's. If one is non-NULL, we return it.
7050 const ConditionalOperator *C = cast<ConditionalOperator>(E);
7052 // Handle the GNU extension for missing LHS.
7053 if (const Expr *LHSExpr = C->getLHS()) {
7054 // In C++, we can have a throw-expression, which has 'void' type.
7055 if (!LHSExpr->getType()->isVoidType())
7056 if (const Expr *LHS = EvalVal(LHSExpr, refVars, ParentDecl))
7060 // In C++, we can have a throw-expression, which has 'void' type.
7061 if (C->getRHS()->getType()->isVoidType())
7064 return EvalVal(C->getRHS(), refVars, ParentDecl);
7067 // Accesses to members are potential references to data on the stack.
7068 case Stmt::MemberExprClass: {
7069 const MemberExpr *M = cast<MemberExpr>(E);
7071 // Check for indirect access. We only want direct field accesses.
7075 // Check whether the member type is itself a reference, in which case
7076 // we're not going to refer to the member, but to what the member refers
7078 if (M->getMemberDecl()->getType()->isReferenceType())
7081 return EvalVal(M->getBase(), refVars, ParentDecl);
7084 case Stmt::MaterializeTemporaryExprClass:
7085 if (const Expr *Result =
7086 EvalVal(cast<MaterializeTemporaryExpr>(E)->GetTemporaryExpr(),
7087 refVars, ParentDecl))
7092 // Check that we don't return or take the address of a reference to a
7093 // temporary. This is only useful in C++.
7094 if (!E->isTypeDependent() && E->isRValue())
7097 // Everything else: we simply don't reason about them.
7104 Sema::CheckReturnValExpr(Expr *RetValExp, QualType lhsType,
7105 SourceLocation ReturnLoc,
7107 const AttrVec *Attrs,
7108 const FunctionDecl *FD) {
7109 CheckReturnStackAddr(*this, RetValExp, lhsType, ReturnLoc);
7111 // Check if the return value is null but should not be.
7112 if (((Attrs && hasSpecificAttr<ReturnsNonNullAttr>(*Attrs)) ||
7113 (!isObjCMethod && isNonNullType(Context, lhsType))) &&
7114 CheckNonNullExpr(*this, RetValExp))
7115 Diag(ReturnLoc, diag::warn_null_ret)
7116 << (isObjCMethod ? 1 : 0) << RetValExp->getSourceRange();
7118 // C++11 [basic.stc.dynamic.allocation]p4:
7119 // If an allocation function declared with a non-throwing
7120 // exception-specification fails to allocate storage, it shall return
7121 // a null pointer. Any other allocation function that fails to allocate
7122 // storage shall indicate failure only by throwing an exception [...]
7124 OverloadedOperatorKind Op = FD->getOverloadedOperator();
7125 if (Op == OO_New || Op == OO_Array_New) {
7126 const FunctionProtoType *Proto
7127 = FD->getType()->castAs<FunctionProtoType>();
7128 if (!Proto->isNothrow(Context, /*ResultIfDependent*/true) &&
7129 CheckNonNullExpr(*this, RetValExp))
7130 Diag(ReturnLoc, diag::warn_operator_new_returns_null)
7131 << FD << getLangOpts().CPlusPlus11;
7136 //===--- CHECK: Floating-Point comparisons (-Wfloat-equal) ---------------===//
7138 /// Check for comparisons of floating point operands using != and ==.
7139 /// Issue a warning if these are no self-comparisons, as they are not likely
7140 /// to do what the programmer intended.
7141 void Sema::CheckFloatComparison(SourceLocation Loc, Expr* LHS, Expr *RHS) {
7142 Expr* LeftExprSansParen = LHS->IgnoreParenImpCasts();
7143 Expr* RightExprSansParen = RHS->IgnoreParenImpCasts();
7145 // Special case: check for x == x (which is OK).
7146 // Do not emit warnings for such cases.
7147 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LeftExprSansParen))
7148 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RightExprSansParen))
7149 if (DRL->getDecl() == DRR->getDecl())
7152 // Special case: check for comparisons against literals that can be exactly
7153 // represented by APFloat. In such cases, do not emit a warning. This
7154 // is a heuristic: often comparison against such literals are used to
7155 // detect if a value in a variable has not changed. This clearly can
7156 // lead to false negatives.
7157 if (FloatingLiteral* FLL = dyn_cast<FloatingLiteral>(LeftExprSansParen)) {
7161 if (FloatingLiteral* FLR = dyn_cast<FloatingLiteral>(RightExprSansParen))
7165 // Check for comparisons with builtin types.
7166 if (CallExpr* CL = dyn_cast<CallExpr>(LeftExprSansParen))
7167 if (CL->getBuiltinCallee())
7170 if (CallExpr* CR = dyn_cast<CallExpr>(RightExprSansParen))
7171 if (CR->getBuiltinCallee())
7174 // Emit the diagnostic.
7175 Diag(Loc, diag::warn_floatingpoint_eq)
7176 << LHS->getSourceRange() << RHS->getSourceRange();
7179 //===--- CHECK: Integer mixed-sign comparisons (-Wsign-compare) --------===//
7180 //===--- CHECK: Lossy implicit conversions (-Wconversion) --------------===//
7184 /// Structure recording the 'active' range of an integer-valued
7187 /// The number of bits active in the int.
7190 /// True if the int is known not to have negative values.
7193 IntRange(unsigned Width, bool NonNegative)
7194 : Width(Width), NonNegative(NonNegative)
7197 /// Returns the range of the bool type.
7198 static IntRange forBoolType() {
7199 return IntRange(1, true);
7202 /// Returns the range of an opaque value of the given integral type.
7203 static IntRange forValueOfType(ASTContext &C, QualType T) {
7204 return forValueOfCanonicalType(C,
7205 T->getCanonicalTypeInternal().getTypePtr());
7208 /// Returns the range of an opaque value of a canonical integral type.
7209 static IntRange forValueOfCanonicalType(ASTContext &C, const Type *T) {
7210 assert(T->isCanonicalUnqualified());
7212 if (const VectorType *VT = dyn_cast<VectorType>(T))
7213 T = VT->getElementType().getTypePtr();
7214 if (const ComplexType *CT = dyn_cast<ComplexType>(T))
7215 T = CT->getElementType().getTypePtr();
7216 if (const AtomicType *AT = dyn_cast<AtomicType>(T))
7217 T = AT->getValueType().getTypePtr();
7219 // For enum types, use the known bit width of the enumerators.
7220 if (const EnumType *ET = dyn_cast<EnumType>(T)) {
7221 EnumDecl *Enum = ET->getDecl();
7222 if (!Enum->isCompleteDefinition())
7223 return IntRange(C.getIntWidth(QualType(T, 0)), false);
7225 unsigned NumPositive = Enum->getNumPositiveBits();
7226 unsigned NumNegative = Enum->getNumNegativeBits();
7228 if (NumNegative == 0)
7229 return IntRange(NumPositive, true/*NonNegative*/);
7231 return IntRange(std::max(NumPositive + 1, NumNegative),
7232 false/*NonNegative*/);
7235 const BuiltinType *BT = cast<BuiltinType>(T);
7236 assert(BT->isInteger());
7238 return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
7241 /// Returns the "target" range of a canonical integral type, i.e.
7242 /// the range of values expressible in the type.
7244 /// This matches forValueOfCanonicalType except that enums have the
7245 /// full range of their type, not the range of their enumerators.
7246 static IntRange forTargetOfCanonicalType(ASTContext &C, const Type *T) {
7247 assert(T->isCanonicalUnqualified());
7249 if (const VectorType *VT = dyn_cast<VectorType>(T))
7250 T = VT->getElementType().getTypePtr();
7251 if (const ComplexType *CT = dyn_cast<ComplexType>(T))
7252 T = CT->getElementType().getTypePtr();
7253 if (const AtomicType *AT = dyn_cast<AtomicType>(T))
7254 T = AT->getValueType().getTypePtr();
7255 if (const EnumType *ET = dyn_cast<EnumType>(T))
7256 T = C.getCanonicalType(ET->getDecl()->getIntegerType()).getTypePtr();
7258 const BuiltinType *BT = cast<BuiltinType>(T);
7259 assert(BT->isInteger());
7261 return IntRange(C.getIntWidth(QualType(T, 0)), BT->isUnsignedInteger());
7264 /// Returns the supremum of two ranges: i.e. their conservative merge.
7265 static IntRange join(IntRange L, IntRange R) {
7266 return IntRange(std::max(L.Width, R.Width),
7267 L.NonNegative && R.NonNegative);
7270 /// Returns the infinum of two ranges: i.e. their aggressive merge.
7271 static IntRange meet(IntRange L, IntRange R) {
7272 return IntRange(std::min(L.Width, R.Width),
7273 L.NonNegative || R.NonNegative);
7277 IntRange GetValueRange(ASTContext &C, llvm::APSInt &value, unsigned MaxWidth) {
7278 if (value.isSigned() && value.isNegative())
7279 return IntRange(value.getMinSignedBits(), false);
7281 if (value.getBitWidth() > MaxWidth)
7282 value = value.trunc(MaxWidth);
7284 // isNonNegative() just checks the sign bit without considering
7286 return IntRange(value.getActiveBits(), true);
7289 IntRange GetValueRange(ASTContext &C, APValue &result, QualType Ty,
7290 unsigned MaxWidth) {
7292 return GetValueRange(C, result.getInt(), MaxWidth);
7294 if (result.isVector()) {
7295 IntRange R = GetValueRange(C, result.getVectorElt(0), Ty, MaxWidth);
7296 for (unsigned i = 1, e = result.getVectorLength(); i != e; ++i) {
7297 IntRange El = GetValueRange(C, result.getVectorElt(i), Ty, MaxWidth);
7298 R = IntRange::join(R, El);
7303 if (result.isComplexInt()) {
7304 IntRange R = GetValueRange(C, result.getComplexIntReal(), MaxWidth);
7305 IntRange I = GetValueRange(C, result.getComplexIntImag(), MaxWidth);
7306 return IntRange::join(R, I);
7309 // This can happen with lossless casts to intptr_t of "based" lvalues.
7310 // Assume it might use arbitrary bits.
7311 // FIXME: The only reason we need to pass the type in here is to get
7312 // the sign right on this one case. It would be nice if APValue
7314 assert(result.isLValue() || result.isAddrLabelDiff());
7315 return IntRange(MaxWidth, Ty->isUnsignedIntegerOrEnumerationType());
7318 QualType GetExprType(const Expr *E) {
7319 QualType Ty = E->getType();
7320 if (const AtomicType *AtomicRHS = Ty->getAs<AtomicType>())
7321 Ty = AtomicRHS->getValueType();
7325 /// Pseudo-evaluate the given integer expression, estimating the
7326 /// range of values it might take.
7328 /// \param MaxWidth - the width to which the value will be truncated
7329 IntRange GetExprRange(ASTContext &C, const Expr *E, unsigned MaxWidth) {
7330 E = E->IgnoreParens();
7332 // Try a full evaluation first.
7333 Expr::EvalResult result;
7334 if (E->EvaluateAsRValue(result, C))
7335 return GetValueRange(C, result.Val, GetExprType(E), MaxWidth);
7337 // I think we only want to look through implicit casts here; if the
7338 // user has an explicit widening cast, we should treat the value as
7339 // being of the new, wider type.
7340 if (const auto *CE = dyn_cast<ImplicitCastExpr>(E)) {
7341 if (CE->getCastKind() == CK_NoOp || CE->getCastKind() == CK_LValueToRValue)
7342 return GetExprRange(C, CE->getSubExpr(), MaxWidth);
7344 IntRange OutputTypeRange = IntRange::forValueOfType(C, GetExprType(CE));
7346 bool isIntegerCast = CE->getCastKind() == CK_IntegralCast ||
7347 CE->getCastKind() == CK_BooleanToSignedIntegral;
7349 // Assume that non-integer casts can span the full range of the type.
7351 return OutputTypeRange;
7354 = GetExprRange(C, CE->getSubExpr(),
7355 std::min(MaxWidth, OutputTypeRange.Width));
7357 // Bail out if the subexpr's range is as wide as the cast type.
7358 if (SubRange.Width >= OutputTypeRange.Width)
7359 return OutputTypeRange;
7361 // Otherwise, we take the smaller width, and we're non-negative if
7362 // either the output type or the subexpr is.
7363 return IntRange(SubRange.Width,
7364 SubRange.NonNegative || OutputTypeRange.NonNegative);
7367 if (const auto *CO = dyn_cast<ConditionalOperator>(E)) {
7368 // If we can fold the condition, just take that operand.
7370 if (CO->getCond()->EvaluateAsBooleanCondition(CondResult, C))
7371 return GetExprRange(C, CondResult ? CO->getTrueExpr()
7372 : CO->getFalseExpr(),
7375 // Otherwise, conservatively merge.
7376 IntRange L = GetExprRange(C, CO->getTrueExpr(), MaxWidth);
7377 IntRange R = GetExprRange(C, CO->getFalseExpr(), MaxWidth);
7378 return IntRange::join(L, R);
7381 if (const auto *BO = dyn_cast<BinaryOperator>(E)) {
7382 switch (BO->getOpcode()) {
7384 // Boolean-valued operations are single-bit and positive.
7393 return IntRange::forBoolType();
7395 // The type of the assignments is the type of the LHS, so the RHS
7396 // is not necessarily the same type.
7405 return IntRange::forValueOfType(C, GetExprType(E));
7407 // Simple assignments just pass through the RHS, which will have
7408 // been coerced to the LHS type.
7411 return GetExprRange(C, BO->getRHS(), MaxWidth);
7413 // Operations with opaque sources are black-listed.
7416 return IntRange::forValueOfType(C, GetExprType(E));
7418 // Bitwise-and uses the *infinum* of the two source ranges.
7421 return IntRange::meet(GetExprRange(C, BO->getLHS(), MaxWidth),
7422 GetExprRange(C, BO->getRHS(), MaxWidth));
7424 // Left shift gets black-listed based on a judgement call.
7426 // ...except that we want to treat '1 << (blah)' as logically
7427 // positive. It's an important idiom.
7428 if (IntegerLiteral *I
7429 = dyn_cast<IntegerLiteral>(BO->getLHS()->IgnoreParenCasts())) {
7430 if (I->getValue() == 1) {
7431 IntRange R = IntRange::forValueOfType(C, GetExprType(E));
7432 return IntRange(R.Width, /*NonNegative*/ true);
7438 return IntRange::forValueOfType(C, GetExprType(E));
7440 // Right shift by a constant can narrow its left argument.
7442 case BO_ShrAssign: {
7443 IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth);
7445 // If the shift amount is a positive constant, drop the width by
7448 if (BO->getRHS()->isIntegerConstantExpr(shift, C) &&
7449 shift.isNonNegative()) {
7450 unsigned zext = shift.getZExtValue();
7451 if (zext >= L.Width)
7452 L.Width = (L.NonNegative ? 0 : 1);
7460 // Comma acts as its right operand.
7462 return GetExprRange(C, BO->getRHS(), MaxWidth);
7464 // Black-list pointer subtractions.
7466 if (BO->getLHS()->getType()->isPointerType())
7467 return IntRange::forValueOfType(C, GetExprType(E));
7470 // The width of a division result is mostly determined by the size
7473 // Don't 'pre-truncate' the operands.
7474 unsigned opWidth = C.getIntWidth(GetExprType(E));
7475 IntRange L = GetExprRange(C, BO->getLHS(), opWidth);
7477 // If the divisor is constant, use that.
7478 llvm::APSInt divisor;
7479 if (BO->getRHS()->isIntegerConstantExpr(divisor, C)) {
7480 unsigned log2 = divisor.logBase2(); // floor(log_2(divisor))
7481 if (log2 >= L.Width)
7482 L.Width = (L.NonNegative ? 0 : 1);
7484 L.Width = std::min(L.Width - log2, MaxWidth);
7488 // Otherwise, just use the LHS's width.
7489 IntRange R = GetExprRange(C, BO->getRHS(), opWidth);
7490 return IntRange(L.Width, L.NonNegative && R.NonNegative);
7493 // The result of a remainder can't be larger than the result of
7496 // Don't 'pre-truncate' the operands.
7497 unsigned opWidth = C.getIntWidth(GetExprType(E));
7498 IntRange L = GetExprRange(C, BO->getLHS(), opWidth);
7499 IntRange R = GetExprRange(C, BO->getRHS(), opWidth);
7501 IntRange meet = IntRange::meet(L, R);
7502 meet.Width = std::min(meet.Width, MaxWidth);
7506 // The default behavior is okay for these.
7514 // The default case is to treat the operation as if it were closed
7515 // on the narrowest type that encompasses both operands.
7516 IntRange L = GetExprRange(C, BO->getLHS(), MaxWidth);
7517 IntRange R = GetExprRange(C, BO->getRHS(), MaxWidth);
7518 return IntRange::join(L, R);
7521 if (const auto *UO = dyn_cast<UnaryOperator>(E)) {
7522 switch (UO->getOpcode()) {
7523 // Boolean-valued operations are white-listed.
7525 return IntRange::forBoolType();
7527 // Operations with opaque sources are black-listed.
7529 case UO_AddrOf: // should be impossible
7530 return IntRange::forValueOfType(C, GetExprType(E));
7533 return GetExprRange(C, UO->getSubExpr(), MaxWidth);
7537 if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
7538 return GetExprRange(C, OVE->getSourceExpr(), MaxWidth);
7540 if (const auto *BitField = E->getSourceBitField())
7541 return IntRange(BitField->getBitWidthValue(C),
7542 BitField->getType()->isUnsignedIntegerOrEnumerationType());
7544 return IntRange::forValueOfType(C, GetExprType(E));
7547 IntRange GetExprRange(ASTContext &C, const Expr *E) {
7548 return GetExprRange(C, E, C.getIntWidth(GetExprType(E)));
7551 /// Checks whether the given value, which currently has the given
7552 /// source semantics, has the same value when coerced through the
7553 /// target semantics.
7554 bool IsSameFloatAfterCast(const llvm::APFloat &value,
7555 const llvm::fltSemantics &Src,
7556 const llvm::fltSemantics &Tgt) {
7557 llvm::APFloat truncated = value;
7560 truncated.convert(Src, llvm::APFloat::rmNearestTiesToEven, &ignored);
7561 truncated.convert(Tgt, llvm::APFloat::rmNearestTiesToEven, &ignored);
7563 return truncated.bitwiseIsEqual(value);
7566 /// Checks whether the given value, which currently has the given
7567 /// source semantics, has the same value when coerced through the
7568 /// target semantics.
7570 /// The value might be a vector of floats (or a complex number).
7571 bool IsSameFloatAfterCast(const APValue &value,
7572 const llvm::fltSemantics &Src,
7573 const llvm::fltSemantics &Tgt) {
7574 if (value.isFloat())
7575 return IsSameFloatAfterCast(value.getFloat(), Src, Tgt);
7577 if (value.isVector()) {
7578 for (unsigned i = 0, e = value.getVectorLength(); i != e; ++i)
7579 if (!IsSameFloatAfterCast(value.getVectorElt(i), Src, Tgt))
7584 assert(value.isComplexFloat());
7585 return (IsSameFloatAfterCast(value.getComplexFloatReal(), Src, Tgt) &&
7586 IsSameFloatAfterCast(value.getComplexFloatImag(), Src, Tgt));
7589 void AnalyzeImplicitConversions(Sema &S, Expr *E, SourceLocation CC);
7591 bool IsZero(Sema &S, Expr *E) {
7592 // Suppress cases where we are comparing against an enum constant.
7593 if (const DeclRefExpr *DR =
7594 dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
7595 if (isa<EnumConstantDecl>(DR->getDecl()))
7598 // Suppress cases where the '0' value is expanded from a macro.
7599 if (E->getLocStart().isMacroID())
7603 return E->isIntegerConstantExpr(Value, S.Context) && Value == 0;
7606 bool HasEnumType(Expr *E) {
7607 // Strip off implicit integral promotions.
7608 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) {
7609 if (ICE->getCastKind() != CK_IntegralCast &&
7610 ICE->getCastKind() != CK_NoOp)
7612 E = ICE->getSubExpr();
7615 return E->getType()->isEnumeralType();
7618 void CheckTrivialUnsignedComparison(Sema &S, BinaryOperator *E) {
7619 // Disable warning in template instantiations.
7620 if (!S.ActiveTemplateInstantiations.empty())
7623 BinaryOperatorKind op = E->getOpcode();
7624 if (E->isValueDependent())
7627 if (op == BO_LT && IsZero(S, E->getRHS())) {
7628 S.Diag(E->getOperatorLoc(), diag::warn_lunsigned_always_true_comparison)
7629 << "< 0" << "false" << HasEnumType(E->getLHS())
7630 << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
7631 } else if (op == BO_GE && IsZero(S, E->getRHS())) {
7632 S.Diag(E->getOperatorLoc(), diag::warn_lunsigned_always_true_comparison)
7633 << ">= 0" << "true" << HasEnumType(E->getLHS())
7634 << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
7635 } else if (op == BO_GT && IsZero(S, E->getLHS())) {
7636 S.Diag(E->getOperatorLoc(), diag::warn_runsigned_always_true_comparison)
7637 << "0 >" << "false" << HasEnumType(E->getRHS())
7638 << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
7639 } else if (op == BO_LE && IsZero(S, E->getLHS())) {
7640 S.Diag(E->getOperatorLoc(), diag::warn_runsigned_always_true_comparison)
7641 << "0 <=" << "true" << HasEnumType(E->getRHS())
7642 << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
7646 void DiagnoseOutOfRangeComparison(Sema &S, BinaryOperator *E, Expr *Constant,
7647 Expr *Other, const llvm::APSInt &Value,
7649 // Disable warning in template instantiations.
7650 if (!S.ActiveTemplateInstantiations.empty())
7653 // TODO: Investigate using GetExprRange() to get tighter bounds
7654 // on the bit ranges.
7655 QualType OtherT = Other->getType();
7656 if (const auto *AT = OtherT->getAs<AtomicType>())
7657 OtherT = AT->getValueType();
7658 IntRange OtherRange = IntRange::forValueOfType(S.Context, OtherT);
7659 unsigned OtherWidth = OtherRange.Width;
7661 bool OtherIsBooleanType = Other->isKnownToHaveBooleanValue();
7663 // 0 values are handled later by CheckTrivialUnsignedComparison().
7664 if ((Value == 0) && (!OtherIsBooleanType))
7667 BinaryOperatorKind op = E->getOpcode();
7670 // Used for diagnostic printout.
7672 LiteralConstant = 0,
7675 } LiteralOrBoolConstant = LiteralConstant;
7677 if (!OtherIsBooleanType) {
7678 QualType ConstantT = Constant->getType();
7679 QualType CommonT = E->getLHS()->getType();
7681 if (S.Context.hasSameUnqualifiedType(OtherT, ConstantT))
7683 assert((OtherT->isIntegerType() && ConstantT->isIntegerType()) &&
7684 "comparison with non-integer type");
7686 bool ConstantSigned = ConstantT->isSignedIntegerType();
7687 bool CommonSigned = CommonT->isSignedIntegerType();
7689 bool EqualityOnly = false;
7692 // The common type is signed, therefore no signed to unsigned conversion.
7693 if (!OtherRange.NonNegative) {
7694 // Check that the constant is representable in type OtherT.
7695 if (ConstantSigned) {
7696 if (OtherWidth >= Value.getMinSignedBits())
7698 } else { // !ConstantSigned
7699 if (OtherWidth >= Value.getActiveBits() + 1)
7702 } else { // !OtherSigned
7703 // Check that the constant is representable in type OtherT.
7704 // Negative values are out of range.
7705 if (ConstantSigned) {
7706 if (Value.isNonNegative() && OtherWidth >= Value.getActiveBits())
7708 } else { // !ConstantSigned
7709 if (OtherWidth >= Value.getActiveBits())
7713 } else { // !CommonSigned
7714 if (OtherRange.NonNegative) {
7715 if (OtherWidth >= Value.getActiveBits())
7717 } else { // OtherSigned
7718 assert(!ConstantSigned &&
7719 "Two signed types converted to unsigned types.");
7720 // Check to see if the constant is representable in OtherT.
7721 if (OtherWidth > Value.getActiveBits())
7723 // Check to see if the constant is equivalent to a negative value
7725 if (S.Context.getIntWidth(ConstantT) ==
7726 S.Context.getIntWidth(CommonT) &&
7727 Value.isNegative() && Value.getMinSignedBits() <= OtherWidth)
7729 // The constant value rests between values that OtherT can represent
7730 // after conversion. Relational comparison still works, but equality
7731 // comparisons will be tautological.
7732 EqualityOnly = true;
7736 bool PositiveConstant = !ConstantSigned || Value.isNonNegative();
7738 if (op == BO_EQ || op == BO_NE) {
7739 IsTrue = op == BO_NE;
7740 } else if (EqualityOnly) {
7742 } else if (RhsConstant) {
7743 if (op == BO_GT || op == BO_GE)
7744 IsTrue = !PositiveConstant;
7745 else // op == BO_LT || op == BO_LE
7746 IsTrue = PositiveConstant;
7748 if (op == BO_LT || op == BO_LE)
7749 IsTrue = !PositiveConstant;
7750 else // op == BO_GT || op == BO_GE
7751 IsTrue = PositiveConstant;
7754 // Other isKnownToHaveBooleanValue
7755 enum CompareBoolWithConstantResult { AFals, ATrue, Unkwn };
7756 enum ConstantValue { LT_Zero, Zero, One, GT_One, SizeOfConstVal };
7757 enum ConstantSide { Lhs, Rhs, SizeOfConstSides };
7759 static const struct LinkedConditions {
7760 CompareBoolWithConstantResult BO_LT_OP[SizeOfConstSides][SizeOfConstVal];
7761 CompareBoolWithConstantResult BO_GT_OP[SizeOfConstSides][SizeOfConstVal];
7762 CompareBoolWithConstantResult BO_LE_OP[SizeOfConstSides][SizeOfConstVal];
7763 CompareBoolWithConstantResult BO_GE_OP[SizeOfConstSides][SizeOfConstVal];
7764 CompareBoolWithConstantResult BO_EQ_OP[SizeOfConstSides][SizeOfConstVal];
7765 CompareBoolWithConstantResult BO_NE_OP[SizeOfConstSides][SizeOfConstVal];
7768 // Constant on LHS. | Constant on RHS. |
7769 // LT_Zero| Zero | One |GT_One| LT_Zero| Zero | One |GT_One|
7770 { { ATrue, Unkwn, AFals, AFals }, { AFals, AFals, Unkwn, ATrue } },
7771 { { AFals, AFals, Unkwn, ATrue }, { ATrue, Unkwn, AFals, AFals } },
7772 { { ATrue, ATrue, Unkwn, AFals }, { AFals, Unkwn, ATrue, ATrue } },
7773 { { AFals, Unkwn, ATrue, ATrue }, { ATrue, ATrue, Unkwn, AFals } },
7774 { { AFals, Unkwn, Unkwn, AFals }, { AFals, Unkwn, Unkwn, AFals } },
7775 { { ATrue, Unkwn, Unkwn, ATrue }, { ATrue, Unkwn, Unkwn, ATrue } }
7778 bool ConstantIsBoolLiteral = isa<CXXBoolLiteralExpr>(Constant);
7780 enum ConstantValue ConstVal = Zero;
7781 if (Value.isUnsigned() || Value.isNonNegative()) {
7783 LiteralOrBoolConstant =
7784 ConstantIsBoolLiteral ? CXXBoolLiteralFalse : LiteralConstant;
7786 } else if (Value == 1) {
7787 LiteralOrBoolConstant =
7788 ConstantIsBoolLiteral ? CXXBoolLiteralTrue : LiteralConstant;
7791 LiteralOrBoolConstant = LiteralConstant;
7798 CompareBoolWithConstantResult CmpRes;
7802 CmpRes = TruthTable.BO_LT_OP[RhsConstant][ConstVal];
7805 CmpRes = TruthTable.BO_GT_OP[RhsConstant][ConstVal];
7808 CmpRes = TruthTable.BO_LE_OP[RhsConstant][ConstVal];
7811 CmpRes = TruthTable.BO_GE_OP[RhsConstant][ConstVal];
7814 CmpRes = TruthTable.BO_EQ_OP[RhsConstant][ConstVal];
7817 CmpRes = TruthTable.BO_NE_OP[RhsConstant][ConstVal];
7824 if (CmpRes == AFals) {
7826 } else if (CmpRes == ATrue) {
7833 // If this is a comparison to an enum constant, include that
7834 // constant in the diagnostic.
7835 const EnumConstantDecl *ED = nullptr;
7836 if (const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(Constant))
7837 ED = dyn_cast<EnumConstantDecl>(DR->getDecl());
7839 SmallString<64> PrettySourceValue;
7840 llvm::raw_svector_ostream OS(PrettySourceValue);
7842 OS << '\'' << *ED << "' (" << Value << ")";
7846 S.DiagRuntimeBehavior(
7847 E->getOperatorLoc(), E,
7848 S.PDiag(diag::warn_out_of_range_compare)
7849 << OS.str() << LiteralOrBoolConstant
7850 << OtherT << (OtherIsBooleanType && !OtherT->isBooleanType()) << IsTrue
7851 << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange());
7854 /// Analyze the operands of the given comparison. Implements the
7855 /// fallback case from AnalyzeComparison.
7856 void AnalyzeImpConvsInComparison(Sema &S, BinaryOperator *E) {
7857 AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
7858 AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
7861 /// \brief Implements -Wsign-compare.
7863 /// \param E the binary operator to check for warnings
7864 void AnalyzeComparison(Sema &S, BinaryOperator *E) {
7865 // The type the comparison is being performed in.
7866 QualType T = E->getLHS()->getType();
7868 // Only analyze comparison operators where both sides have been converted to
7870 if (!S.Context.hasSameUnqualifiedType(T, E->getRHS()->getType()))
7871 return AnalyzeImpConvsInComparison(S, E);
7873 // Don't analyze value-dependent comparisons directly.
7874 if (E->isValueDependent())
7875 return AnalyzeImpConvsInComparison(S, E);
7877 Expr *LHS = E->getLHS()->IgnoreParenImpCasts();
7878 Expr *RHS = E->getRHS()->IgnoreParenImpCasts();
7880 bool IsComparisonConstant = false;
7882 // Check whether an integer constant comparison results in a value
7883 // of 'true' or 'false'.
7884 if (T->isIntegralType(S.Context)) {
7885 llvm::APSInt RHSValue;
7886 bool IsRHSIntegralLiteral =
7887 RHS->isIntegerConstantExpr(RHSValue, S.Context);
7888 llvm::APSInt LHSValue;
7889 bool IsLHSIntegralLiteral =
7890 LHS->isIntegerConstantExpr(LHSValue, S.Context);
7891 if (IsRHSIntegralLiteral && !IsLHSIntegralLiteral)
7892 DiagnoseOutOfRangeComparison(S, E, RHS, LHS, RHSValue, true);
7893 else if (!IsRHSIntegralLiteral && IsLHSIntegralLiteral)
7894 DiagnoseOutOfRangeComparison(S, E, LHS, RHS, LHSValue, false);
7896 IsComparisonConstant =
7897 (IsRHSIntegralLiteral && IsLHSIntegralLiteral);
7898 } else if (!T->hasUnsignedIntegerRepresentation())
7899 IsComparisonConstant = E->isIntegerConstantExpr(S.Context);
7901 // We don't do anything special if this isn't an unsigned integral
7902 // comparison: we're only interested in integral comparisons, and
7903 // signed comparisons only happen in cases we don't care to warn about.
7905 // We also don't care about value-dependent expressions or expressions
7906 // whose result is a constant.
7907 if (!T->hasUnsignedIntegerRepresentation() || IsComparisonConstant)
7908 return AnalyzeImpConvsInComparison(S, E);
7910 // Check to see if one of the (unmodified) operands is of different
7912 Expr *signedOperand, *unsignedOperand;
7913 if (LHS->getType()->hasSignedIntegerRepresentation()) {
7914 assert(!RHS->getType()->hasSignedIntegerRepresentation() &&
7915 "unsigned comparison between two signed integer expressions?");
7916 signedOperand = LHS;
7917 unsignedOperand = RHS;
7918 } else if (RHS->getType()->hasSignedIntegerRepresentation()) {
7919 signedOperand = RHS;
7920 unsignedOperand = LHS;
7922 CheckTrivialUnsignedComparison(S, E);
7923 return AnalyzeImpConvsInComparison(S, E);
7926 // Otherwise, calculate the effective range of the signed operand.
7927 IntRange signedRange = GetExprRange(S.Context, signedOperand);
7929 // Go ahead and analyze implicit conversions in the operands. Note
7930 // that we skip the implicit conversions on both sides.
7931 AnalyzeImplicitConversions(S, LHS, E->getOperatorLoc());
7932 AnalyzeImplicitConversions(S, RHS, E->getOperatorLoc());
7934 // If the signed range is non-negative, -Wsign-compare won't fire,
7935 // but we should still check for comparisons which are always true
7937 if (signedRange.NonNegative)
7938 return CheckTrivialUnsignedComparison(S, E);
7940 // For (in)equality comparisons, if the unsigned operand is a
7941 // constant which cannot collide with a overflowed signed operand,
7942 // then reinterpreting the signed operand as unsigned will not
7943 // change the result of the comparison.
7944 if (E->isEqualityOp()) {
7945 unsigned comparisonWidth = S.Context.getIntWidth(T);
7946 IntRange unsignedRange = GetExprRange(S.Context, unsignedOperand);
7948 // We should never be unable to prove that the unsigned operand is
7950 assert(unsignedRange.NonNegative && "unsigned range includes negative?");
7952 if (unsignedRange.Width < comparisonWidth)
7956 S.DiagRuntimeBehavior(E->getOperatorLoc(), E,
7957 S.PDiag(diag::warn_mixed_sign_comparison)
7958 << LHS->getType() << RHS->getType()
7959 << LHS->getSourceRange() << RHS->getSourceRange());
7962 /// Analyzes an attempt to assign the given value to a bitfield.
7964 /// Returns true if there was something fishy about the attempt.
7965 bool AnalyzeBitFieldAssignment(Sema &S, FieldDecl *Bitfield, Expr *Init,
7966 SourceLocation InitLoc) {
7967 assert(Bitfield->isBitField());
7968 if (Bitfield->isInvalidDecl())
7971 // White-list bool bitfields.
7972 if (Bitfield->getType()->isBooleanType())
7975 // Ignore value- or type-dependent expressions.
7976 if (Bitfield->getBitWidth()->isValueDependent() ||
7977 Bitfield->getBitWidth()->isTypeDependent() ||
7978 Init->isValueDependent() ||
7979 Init->isTypeDependent())
7982 Expr *OriginalInit = Init->IgnoreParenImpCasts();
7985 if (!OriginalInit->EvaluateAsInt(Value, S.Context, Expr::SE_AllowSideEffects))
7988 unsigned OriginalWidth = Value.getBitWidth();
7989 unsigned FieldWidth = Bitfield->getBitWidthValue(S.Context);
7991 if (Value.isSigned() && Value.isNegative())
7992 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(OriginalInit))
7993 if (UO->getOpcode() == UO_Minus)
7994 if (isa<IntegerLiteral>(UO->getSubExpr()))
7995 OriginalWidth = Value.getMinSignedBits();
7997 if (OriginalWidth <= FieldWidth)
8000 // Compute the value which the bitfield will contain.
8001 llvm::APSInt TruncatedValue = Value.trunc(FieldWidth);
8002 TruncatedValue.setIsSigned(Bitfield->getType()->isSignedIntegerType());
8004 // Check whether the stored value is equal to the original value.
8005 TruncatedValue = TruncatedValue.extend(OriginalWidth);
8006 if (llvm::APSInt::isSameValue(Value, TruncatedValue))
8009 // Special-case bitfields of width 1: booleans are naturally 0/1, and
8010 // therefore don't strictly fit into a signed bitfield of width 1.
8011 if (FieldWidth == 1 && Value == 1)
8014 std::string PrettyValue = Value.toString(10);
8015 std::string PrettyTrunc = TruncatedValue.toString(10);
8017 S.Diag(InitLoc, diag::warn_impcast_bitfield_precision_constant)
8018 << PrettyValue << PrettyTrunc << OriginalInit->getType()
8019 << Init->getSourceRange();
8024 /// Analyze the given simple or compound assignment for warning-worthy
8026 void AnalyzeAssignment(Sema &S, BinaryOperator *E) {
8027 // Just recurse on the LHS.
8028 AnalyzeImplicitConversions(S, E->getLHS(), E->getOperatorLoc());
8030 // We want to recurse on the RHS as normal unless we're assigning to
8032 if (FieldDecl *Bitfield = E->getLHS()->getSourceBitField()) {
8033 if (AnalyzeBitFieldAssignment(S, Bitfield, E->getRHS(),
8034 E->getOperatorLoc())) {
8035 // Recurse, ignoring any implicit conversions on the RHS.
8036 return AnalyzeImplicitConversions(S, E->getRHS()->IgnoreParenImpCasts(),
8037 E->getOperatorLoc());
8041 AnalyzeImplicitConversions(S, E->getRHS(), E->getOperatorLoc());
8044 /// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
8045 void DiagnoseImpCast(Sema &S, Expr *E, QualType SourceType, QualType T,
8046 SourceLocation CContext, unsigned diag,
8047 bool pruneControlFlow = false) {
8048 if (pruneControlFlow) {
8049 S.DiagRuntimeBehavior(E->getExprLoc(), E,
8051 << SourceType << T << E->getSourceRange()
8052 << SourceRange(CContext));
8055 S.Diag(E->getExprLoc(), diag)
8056 << SourceType << T << E->getSourceRange() << SourceRange(CContext);
8059 /// Diagnose an implicit cast; purely a helper for CheckImplicitConversion.
8060 void DiagnoseImpCast(Sema &S, Expr *E, QualType T, SourceLocation CContext,
8061 unsigned diag, bool pruneControlFlow = false) {
8062 DiagnoseImpCast(S, E, E->getType(), T, CContext, diag, pruneControlFlow);
8066 /// Diagnose an implicit cast from a floating point value to an integer value.
8067 void DiagnoseFloatingImpCast(Sema &S, Expr *E, QualType T,
8069 SourceLocation CContext) {
8070 const bool IsBool = T->isSpecificBuiltinType(BuiltinType::Bool);
8071 const bool PruneWarnings = !S.ActiveTemplateInstantiations.empty();
8073 Expr *InnerE = E->IgnoreParenImpCasts();
8074 // We also want to warn on, e.g., "int i = -1.234"
8075 if (UnaryOperator *UOp = dyn_cast<UnaryOperator>(InnerE))
8076 if (UOp->getOpcode() == UO_Minus || UOp->getOpcode() == UO_Plus)
8077 InnerE = UOp->getSubExpr()->IgnoreParenImpCasts();
8079 const bool IsLiteral =
8080 isa<FloatingLiteral>(E) || isa<FloatingLiteral>(InnerE);
8082 llvm::APFloat Value(0.0);
8084 E->EvaluateAsFloat(Value, S.Context, Expr::SE_AllowSideEffects);
8086 return DiagnoseImpCast(S, E, T, CContext,
8087 diag::warn_impcast_float_integer, PruneWarnings);
8090 bool isExact = false;
8092 llvm::APSInt IntegerValue(S.Context.getIntWidth(T),
8093 T->hasUnsignedIntegerRepresentation());
8094 if (Value.convertToInteger(IntegerValue, llvm::APFloat::rmTowardZero,
8095 &isExact) == llvm::APFloat::opOK &&
8097 if (IsLiteral) return;
8098 return DiagnoseImpCast(S, E, T, CContext, diag::warn_impcast_float_integer,
8102 unsigned DiagID = 0;
8104 // Warn on floating point literal to integer.
8105 DiagID = diag::warn_impcast_literal_float_to_integer;
8106 } else if (IntegerValue == 0) {
8107 if (Value.isZero()) { // Skip -0.0 to 0 conversion.
8108 return DiagnoseImpCast(S, E, T, CContext,
8109 diag::warn_impcast_float_integer, PruneWarnings);
8111 // Warn on non-zero to zero conversion.
8112 DiagID = diag::warn_impcast_float_to_integer_zero;
8114 if (IntegerValue.isUnsigned()) {
8115 if (!IntegerValue.isMaxValue()) {
8116 return DiagnoseImpCast(S, E, T, CContext,
8117 diag::warn_impcast_float_integer, PruneWarnings);
8119 } else { // IntegerValue.isSigned()
8120 if (!IntegerValue.isMaxSignedValue() &&
8121 !IntegerValue.isMinSignedValue()) {
8122 return DiagnoseImpCast(S, E, T, CContext,
8123 diag::warn_impcast_float_integer, PruneWarnings);
8126 // Warn on evaluatable floating point expression to integer conversion.
8127 DiagID = diag::warn_impcast_float_to_integer;
8130 // FIXME: Force the precision of the source value down so we don't print
8131 // digits which are usually useless (we don't really care here if we
8132 // truncate a digit by accident in edge cases). Ideally, APFloat::toString
8133 // would automatically print the shortest representation, but it's a bit
8134 // tricky to implement.
8135 SmallString<16> PrettySourceValue;
8136 unsigned precision = llvm::APFloat::semanticsPrecision(Value.getSemantics());
8137 precision = (precision * 59 + 195) / 196;
8138 Value.toString(PrettySourceValue, precision);
8140 SmallString<16> PrettyTargetValue;
8142 PrettyTargetValue = Value.isZero() ? "false" : "true";
8144 IntegerValue.toString(PrettyTargetValue);
8146 if (PruneWarnings) {
8147 S.DiagRuntimeBehavior(E->getExprLoc(), E,
8149 << E->getType() << T.getUnqualifiedType()
8150 << PrettySourceValue << PrettyTargetValue
8151 << E->getSourceRange() << SourceRange(CContext));
8153 S.Diag(E->getExprLoc(), DiagID)
8154 << E->getType() << T.getUnqualifiedType() << PrettySourceValue
8155 << PrettyTargetValue << E->getSourceRange() << SourceRange(CContext);
8159 std::string PrettyPrintInRange(const llvm::APSInt &Value, IntRange Range) {
8160 if (!Range.Width) return "0";
8162 llvm::APSInt ValueInRange = Value;
8163 ValueInRange.setIsSigned(!Range.NonNegative);
8164 ValueInRange = ValueInRange.trunc(Range.Width);
8165 return ValueInRange.toString(10);
8168 bool IsImplicitBoolFloatConversion(Sema &S, Expr *Ex, bool ToBool) {
8169 if (!isa<ImplicitCastExpr>(Ex))
8172 Expr *InnerE = Ex->IgnoreParenImpCasts();
8173 const Type *Target = S.Context.getCanonicalType(Ex->getType()).getTypePtr();
8174 const Type *Source =
8175 S.Context.getCanonicalType(InnerE->getType()).getTypePtr();
8176 if (Target->isDependentType())
8179 const BuiltinType *FloatCandidateBT =
8180 dyn_cast<BuiltinType>(ToBool ? Source : Target);
8181 const Type *BoolCandidateType = ToBool ? Target : Source;
8183 return (BoolCandidateType->isSpecificBuiltinType(BuiltinType::Bool) &&
8184 FloatCandidateBT && (FloatCandidateBT->isFloatingPoint()));
8187 void CheckImplicitArgumentConversions(Sema &S, CallExpr *TheCall,
8188 SourceLocation CC) {
8189 unsigned NumArgs = TheCall->getNumArgs();
8190 for (unsigned i = 0; i < NumArgs; ++i) {
8191 Expr *CurrA = TheCall->getArg(i);
8192 if (!IsImplicitBoolFloatConversion(S, CurrA, true))
8195 bool IsSwapped = ((i > 0) &&
8196 IsImplicitBoolFloatConversion(S, TheCall->getArg(i - 1), false));
8197 IsSwapped |= ((i < (NumArgs - 1)) &&
8198 IsImplicitBoolFloatConversion(S, TheCall->getArg(i + 1), false));
8200 // Warn on this floating-point to bool conversion.
8201 DiagnoseImpCast(S, CurrA->IgnoreParenImpCasts(),
8202 CurrA->getType(), CC,
8203 diag::warn_impcast_floating_point_to_bool);
8208 void DiagnoseNullConversion(Sema &S, Expr *E, QualType T, SourceLocation CC) {
8209 if (S.Diags.isIgnored(diag::warn_impcast_null_pointer_to_integer,
8213 // Don't warn on functions which have return type nullptr_t.
8214 if (isa<CallExpr>(E))
8217 // Check for NULL (GNUNull) or nullptr (CXX11_nullptr).
8218 const Expr::NullPointerConstantKind NullKind =
8219 E->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull);
8220 if (NullKind != Expr::NPCK_GNUNull && NullKind != Expr::NPCK_CXX11_nullptr)
8223 // Return if target type is a safe conversion.
8224 if (T->isAnyPointerType() || T->isBlockPointerType() ||
8225 T->isMemberPointerType() || !T->isScalarType() || T->isNullPtrType())
8228 SourceLocation Loc = E->getSourceRange().getBegin();
8230 // Venture through the macro stacks to get to the source of macro arguments.
8231 // The new location is a better location than the complete location that was
8233 while (S.SourceMgr.isMacroArgExpansion(Loc))
8234 Loc = S.SourceMgr.getImmediateMacroCallerLoc(Loc);
8236 while (S.SourceMgr.isMacroArgExpansion(CC))
8237 CC = S.SourceMgr.getImmediateMacroCallerLoc(CC);
8239 // __null is usually wrapped in a macro. Go up a macro if that is the case.
8240 if (NullKind == Expr::NPCK_GNUNull && Loc.isMacroID()) {
8241 StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
8242 Loc, S.SourceMgr, S.getLangOpts());
8243 if (MacroName == "NULL")
8244 Loc = S.SourceMgr.getImmediateExpansionRange(Loc).first;
8247 // Only warn if the null and context location are in the same macro expansion.
8248 if (S.SourceMgr.getFileID(Loc) != S.SourceMgr.getFileID(CC))
8251 S.Diag(Loc, diag::warn_impcast_null_pointer_to_integer)
8252 << (NullKind == Expr::NPCK_CXX11_nullptr) << T << clang::SourceRange(CC)
8253 << FixItHint::CreateReplacement(Loc,
8254 S.getFixItZeroLiteralForType(T, Loc));
8257 void checkObjCArrayLiteral(Sema &S, QualType TargetType,
8258 ObjCArrayLiteral *ArrayLiteral);
8259 void checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
8260 ObjCDictionaryLiteral *DictionaryLiteral);
8262 /// Check a single element within a collection literal against the
8263 /// target element type.
8264 void checkObjCCollectionLiteralElement(Sema &S, QualType TargetElementType,
8265 Expr *Element, unsigned ElementKind) {
8266 // Skip a bitcast to 'id' or qualified 'id'.
8267 if (auto ICE = dyn_cast<ImplicitCastExpr>(Element)) {
8268 if (ICE->getCastKind() == CK_BitCast &&
8269 ICE->getSubExpr()->getType()->getAs<ObjCObjectPointerType>())
8270 Element = ICE->getSubExpr();
8273 QualType ElementType = Element->getType();
8274 ExprResult ElementResult(Element);
8275 if (ElementType->getAs<ObjCObjectPointerType>() &&
8276 S.CheckSingleAssignmentConstraints(TargetElementType,
8279 != Sema::Compatible) {
8280 S.Diag(Element->getLocStart(),
8281 diag::warn_objc_collection_literal_element)
8282 << ElementType << ElementKind << TargetElementType
8283 << Element->getSourceRange();
8286 if (auto ArrayLiteral = dyn_cast<ObjCArrayLiteral>(Element))
8287 checkObjCArrayLiteral(S, TargetElementType, ArrayLiteral);
8288 else if (auto DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(Element))
8289 checkObjCDictionaryLiteral(S, TargetElementType, DictionaryLiteral);
8292 /// Check an Objective-C array literal being converted to the given
8294 void checkObjCArrayLiteral(Sema &S, QualType TargetType,
8295 ObjCArrayLiteral *ArrayLiteral) {
8299 const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
8303 if (TargetObjCPtr->isUnspecialized() ||
8304 TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
8305 != S.NSArrayDecl->getCanonicalDecl())
8308 auto TypeArgs = TargetObjCPtr->getTypeArgs();
8309 if (TypeArgs.size() != 1)
8312 QualType TargetElementType = TypeArgs[0];
8313 for (unsigned I = 0, N = ArrayLiteral->getNumElements(); I != N; ++I) {
8314 checkObjCCollectionLiteralElement(S, TargetElementType,
8315 ArrayLiteral->getElement(I),
8320 /// Check an Objective-C dictionary literal being converted to the given
8322 void checkObjCDictionaryLiteral(Sema &S, QualType TargetType,
8323 ObjCDictionaryLiteral *DictionaryLiteral) {
8324 if (!S.NSDictionaryDecl)
8327 const auto *TargetObjCPtr = TargetType->getAs<ObjCObjectPointerType>();
8331 if (TargetObjCPtr->isUnspecialized() ||
8332 TargetObjCPtr->getInterfaceDecl()->getCanonicalDecl()
8333 != S.NSDictionaryDecl->getCanonicalDecl())
8336 auto TypeArgs = TargetObjCPtr->getTypeArgs();
8337 if (TypeArgs.size() != 2)
8340 QualType TargetKeyType = TypeArgs[0];
8341 QualType TargetObjectType = TypeArgs[1];
8342 for (unsigned I = 0, N = DictionaryLiteral->getNumElements(); I != N; ++I) {
8343 auto Element = DictionaryLiteral->getKeyValueElement(I);
8344 checkObjCCollectionLiteralElement(S, TargetKeyType, Element.Key, 1);
8345 checkObjCCollectionLiteralElement(S, TargetObjectType, Element.Value, 2);
8349 // Helper function to filter out cases for constant width constant conversion.
8350 // Don't warn on char array initialization or for non-decimal values.
8351 bool isSameWidthConstantConversion(Sema &S, Expr *E, QualType T,
8352 SourceLocation CC) {
8353 // If initializing from a constant, and the constant starts with '0',
8354 // then it is a binary, octal, or hexadecimal. Allow these constants
8355 // to fill all the bits, even if there is a sign change.
8356 if (auto *IntLit = dyn_cast<IntegerLiteral>(E->IgnoreParenImpCasts())) {
8357 const char FirstLiteralCharacter =
8358 S.getSourceManager().getCharacterData(IntLit->getLocStart())[0];
8359 if (FirstLiteralCharacter == '0')
8363 // If the CC location points to a '{', and the type is char, then assume
8364 // assume it is an array initialization.
8365 if (CC.isValid() && T->isCharType()) {
8366 const char FirstContextCharacter =
8367 S.getSourceManager().getCharacterData(CC)[0];
8368 if (FirstContextCharacter == '{')
8375 void CheckImplicitConversion(Sema &S, Expr *E, QualType T,
8376 SourceLocation CC, bool *ICContext = nullptr) {
8377 if (E->isTypeDependent() || E->isValueDependent()) return;
8379 const Type *Source = S.Context.getCanonicalType(E->getType()).getTypePtr();
8380 const Type *Target = S.Context.getCanonicalType(T).getTypePtr();
8381 if (Source == Target) return;
8382 if (Target->isDependentType()) return;
8384 // If the conversion context location is invalid don't complain. We also
8385 // don't want to emit a warning if the issue occurs from the expansion of
8386 // a system macro. The problem is that 'getSpellingLoc()' is slow, so we
8387 // delay this check as long as possible. Once we detect we are in that
8388 // scenario, we just return.
8392 // Diagnose implicit casts to bool.
8393 if (Target->isSpecificBuiltinType(BuiltinType::Bool)) {
8394 if (isa<StringLiteral>(E))
8395 // Warn on string literal to bool. Checks for string literals in logical
8396 // and expressions, for instance, assert(0 && "error here"), are
8397 // prevented by a check in AnalyzeImplicitConversions().
8398 return DiagnoseImpCast(S, E, T, CC,
8399 diag::warn_impcast_string_literal_to_bool);
8400 if (isa<ObjCStringLiteral>(E) || isa<ObjCArrayLiteral>(E) ||
8401 isa<ObjCDictionaryLiteral>(E) || isa<ObjCBoxedExpr>(E)) {
8402 // This covers the literal expressions that evaluate to Objective-C
8404 return DiagnoseImpCast(S, E, T, CC,
8405 diag::warn_impcast_objective_c_literal_to_bool);
8407 if (Source->isPointerType() || Source->canDecayToPointerType()) {
8408 // Warn on pointer to bool conversion that is always true.
8409 S.DiagnoseAlwaysNonNullPointer(E, Expr::NPCK_NotNull, /*IsEqual*/ false,
8414 // Check implicit casts from Objective-C collection literals to specialized
8415 // collection types, e.g., NSArray<NSString *> *.
8416 if (auto *ArrayLiteral = dyn_cast<ObjCArrayLiteral>(E))
8417 checkObjCArrayLiteral(S, QualType(Target, 0), ArrayLiteral);
8418 else if (auto *DictionaryLiteral = dyn_cast<ObjCDictionaryLiteral>(E))
8419 checkObjCDictionaryLiteral(S, QualType(Target, 0), DictionaryLiteral);
8421 // Strip vector types.
8422 if (isa<VectorType>(Source)) {
8423 if (!isa<VectorType>(Target)) {
8424 if (S.SourceMgr.isInSystemMacro(CC))
8426 return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_vector_scalar);
8429 // If the vector cast is cast between two vectors of the same size, it is
8430 // a bitcast, not a conversion.
8431 if (S.Context.getTypeSize(Source) == S.Context.getTypeSize(Target))
8434 Source = cast<VectorType>(Source)->getElementType().getTypePtr();
8435 Target = cast<VectorType>(Target)->getElementType().getTypePtr();
8437 if (auto VecTy = dyn_cast<VectorType>(Target))
8438 Target = VecTy->getElementType().getTypePtr();
8440 // Strip complex types.
8441 if (isa<ComplexType>(Source)) {
8442 if (!isa<ComplexType>(Target)) {
8443 if (S.SourceMgr.isInSystemMacro(CC))
8446 return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_complex_scalar);
8449 Source = cast<ComplexType>(Source)->getElementType().getTypePtr();
8450 Target = cast<ComplexType>(Target)->getElementType().getTypePtr();
8453 const BuiltinType *SourceBT = dyn_cast<BuiltinType>(Source);
8454 const BuiltinType *TargetBT = dyn_cast<BuiltinType>(Target);
8456 // If the source is floating point...
8457 if (SourceBT && SourceBT->isFloatingPoint()) {
8458 // ...and the target is floating point...
8459 if (TargetBT && TargetBT->isFloatingPoint()) {
8460 // ...then warn if we're dropping FP rank.
8462 // Builtin FP kinds are ordered by increasing FP rank.
8463 if (SourceBT->getKind() > TargetBT->getKind()) {
8464 // Don't warn about float constants that are precisely
8465 // representable in the target type.
8466 Expr::EvalResult result;
8467 if (E->EvaluateAsRValue(result, S.Context)) {
8468 // Value might be a float, a float vector, or a float complex.
8469 if (IsSameFloatAfterCast(result.Val,
8470 S.Context.getFloatTypeSemantics(QualType(TargetBT, 0)),
8471 S.Context.getFloatTypeSemantics(QualType(SourceBT, 0))))
8475 if (S.SourceMgr.isInSystemMacro(CC))
8478 DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_float_precision);
8480 // ... or possibly if we're increasing rank, too
8481 else if (TargetBT->getKind() > SourceBT->getKind()) {
8482 if (S.SourceMgr.isInSystemMacro(CC))
8485 DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_double_promotion);
8490 // If the target is integral, always warn.
8491 if (TargetBT && TargetBT->isInteger()) {
8492 if (S.SourceMgr.isInSystemMacro(CC))
8495 DiagnoseFloatingImpCast(S, E, T, CC);
8498 // Detect the case where a call result is converted from floating-point to
8499 // to bool, and the final argument to the call is converted from bool, to
8500 // discover this typo:
8502 // bool b = fabs(x < 1.0); // should be "bool b = fabs(x) < 1.0;"
8504 // FIXME: This is an incredibly special case; is there some more general
8505 // way to detect this class of misplaced-parentheses bug?
8506 if (Target->isBooleanType() && isa<CallExpr>(E)) {
8507 // Check last argument of function call to see if it is an
8508 // implicit cast from a type matching the type the result
8509 // is being cast to.
8510 CallExpr *CEx = cast<CallExpr>(E);
8511 if (unsigned NumArgs = CEx->getNumArgs()) {
8512 Expr *LastA = CEx->getArg(NumArgs - 1);
8513 Expr *InnerE = LastA->IgnoreParenImpCasts();
8514 if (isa<ImplicitCastExpr>(LastA) &&
8515 InnerE->getType()->isBooleanType()) {
8516 // Warn on this floating-point to bool conversion
8517 DiagnoseImpCast(S, E, T, CC,
8518 diag::warn_impcast_floating_point_to_bool);
8525 DiagnoseNullConversion(S, E, T, CC);
8527 if (!Source->isIntegerType() || !Target->isIntegerType())
8530 // TODO: remove this early return once the false positives for constant->bool
8531 // in templates, macros, etc, are reduced or removed.
8532 if (Target->isSpecificBuiltinType(BuiltinType::Bool))
8535 IntRange SourceRange = GetExprRange(S.Context, E);
8536 IntRange TargetRange = IntRange::forTargetOfCanonicalType(S.Context, Target);
8538 if (SourceRange.Width > TargetRange.Width) {
8539 // If the source is a constant, use a default-on diagnostic.
8540 // TODO: this should happen for bitfield stores, too.
8541 llvm::APSInt Value(32);
8542 if (E->EvaluateAsInt(Value, S.Context, Expr::SE_AllowSideEffects)) {
8543 if (S.SourceMgr.isInSystemMacro(CC))
8546 std::string PrettySourceValue = Value.toString(10);
8547 std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
8549 S.DiagRuntimeBehavior(E->getExprLoc(), E,
8550 S.PDiag(diag::warn_impcast_integer_precision_constant)
8551 << PrettySourceValue << PrettyTargetValue
8552 << E->getType() << T << E->getSourceRange()
8553 << clang::SourceRange(CC));
8557 // People want to build with -Wshorten-64-to-32 and not -Wconversion.
8558 if (S.SourceMgr.isInSystemMacro(CC))
8561 if (TargetRange.Width == 32 && S.Context.getIntWidth(E->getType()) == 64)
8562 return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_64_32,
8563 /* pruneControlFlow */ true);
8564 return DiagnoseImpCast(S, E, T, CC, diag::warn_impcast_integer_precision);
8567 if (TargetRange.Width == SourceRange.Width && !TargetRange.NonNegative &&
8568 SourceRange.NonNegative && Source->isSignedIntegerType()) {
8569 // Warn when doing a signed to signed conversion, warn if the positive
8570 // source value is exactly the width of the target type, which will
8571 // cause a negative value to be stored.
8574 if (E->EvaluateAsInt(Value, S.Context, Expr::SE_AllowSideEffects) &&
8575 !S.SourceMgr.isInSystemMacro(CC)) {
8576 if (isSameWidthConstantConversion(S, E, T, CC)) {
8577 std::string PrettySourceValue = Value.toString(10);
8578 std::string PrettyTargetValue = PrettyPrintInRange(Value, TargetRange);
8580 S.DiagRuntimeBehavior(
8582 S.PDiag(diag::warn_impcast_integer_precision_constant)
8583 << PrettySourceValue << PrettyTargetValue << E->getType() << T
8584 << E->getSourceRange() << clang::SourceRange(CC));
8589 // Fall through for non-constants to give a sign conversion warning.
8592 if ((TargetRange.NonNegative && !SourceRange.NonNegative) ||
8593 (!TargetRange.NonNegative && SourceRange.NonNegative &&
8594 SourceRange.Width == TargetRange.Width)) {
8595 if (S.SourceMgr.isInSystemMacro(CC))
8598 unsigned DiagID = diag::warn_impcast_integer_sign;
8600 // Traditionally, gcc has warned about this under -Wsign-compare.
8601 // We also want to warn about it in -Wconversion.
8602 // So if -Wconversion is off, use a completely identical diagnostic
8603 // in the sign-compare group.
8604 // The conditional-checking code will
8606 DiagID = diag::warn_impcast_integer_sign_conditional;
8610 return DiagnoseImpCast(S, E, T, CC, DiagID);
8613 // Diagnose conversions between different enumeration types.
8614 // In C, we pretend that the type of an EnumConstantDecl is its enumeration
8615 // type, to give us better diagnostics.
8616 QualType SourceType = E->getType();
8617 if (!S.getLangOpts().CPlusPlus) {
8618 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
8619 if (EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(DRE->getDecl())) {
8620 EnumDecl *Enum = cast<EnumDecl>(ECD->getDeclContext());
8621 SourceType = S.Context.getTypeDeclType(Enum);
8622 Source = S.Context.getCanonicalType(SourceType).getTypePtr();
8626 if (const EnumType *SourceEnum = Source->getAs<EnumType>())
8627 if (const EnumType *TargetEnum = Target->getAs<EnumType>())
8628 if (SourceEnum->getDecl()->hasNameForLinkage() &&
8629 TargetEnum->getDecl()->hasNameForLinkage() &&
8630 SourceEnum != TargetEnum) {
8631 if (S.SourceMgr.isInSystemMacro(CC))
8634 return DiagnoseImpCast(S, E, SourceType, T, CC,
8635 diag::warn_impcast_different_enum_types);
8639 void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
8640 SourceLocation CC, QualType T);
8642 void CheckConditionalOperand(Sema &S, Expr *E, QualType T,
8643 SourceLocation CC, bool &ICContext) {
8644 E = E->IgnoreParenImpCasts();
8646 if (isa<ConditionalOperator>(E))
8647 return CheckConditionalOperator(S, cast<ConditionalOperator>(E), CC, T);
8649 AnalyzeImplicitConversions(S, E, CC);
8650 if (E->getType() != T)
8651 return CheckImplicitConversion(S, E, T, CC, &ICContext);
8654 void CheckConditionalOperator(Sema &S, ConditionalOperator *E,
8655 SourceLocation CC, QualType T) {
8656 AnalyzeImplicitConversions(S, E->getCond(), E->getQuestionLoc());
8658 bool Suspicious = false;
8659 CheckConditionalOperand(S, E->getTrueExpr(), T, CC, Suspicious);
8660 CheckConditionalOperand(S, E->getFalseExpr(), T, CC, Suspicious);
8662 // If -Wconversion would have warned about either of the candidates
8663 // for a signedness conversion to the context type...
8664 if (!Suspicious) return;
8666 // ...but it's currently ignored...
8667 if (!S.Diags.isIgnored(diag::warn_impcast_integer_sign_conditional, CC))
8670 // ...then check whether it would have warned about either of the
8671 // candidates for a signedness conversion to the condition type.
8672 if (E->getType() == T) return;
8675 CheckImplicitConversion(S, E->getTrueExpr()->IgnoreParenImpCasts(),
8676 E->getType(), CC, &Suspicious);
8678 CheckImplicitConversion(S, E->getFalseExpr()->IgnoreParenImpCasts(),
8679 E->getType(), CC, &Suspicious);
8682 /// CheckBoolLikeConversion - Check conversion of given expression to boolean.
8683 /// Input argument E is a logical expression.
8684 void CheckBoolLikeConversion(Sema &S, Expr *E, SourceLocation CC) {
8685 if (S.getLangOpts().Bool)
8687 CheckImplicitConversion(S, E->IgnoreParenImpCasts(), S.Context.BoolTy, CC);
8690 /// AnalyzeImplicitConversions - Find and report any interesting
8691 /// implicit conversions in the given expression. There are a couple
8692 /// of competing diagnostics here, -Wconversion and -Wsign-compare.
8693 void AnalyzeImplicitConversions(Sema &S, Expr *OrigE, SourceLocation CC) {
8694 QualType T = OrigE->getType();
8695 Expr *E = OrigE->IgnoreParenImpCasts();
8697 if (E->isTypeDependent() || E->isValueDependent())
8700 // For conditional operators, we analyze the arguments as if they
8701 // were being fed directly into the output.
8702 if (isa<ConditionalOperator>(E)) {
8703 ConditionalOperator *CO = cast<ConditionalOperator>(E);
8704 CheckConditionalOperator(S, CO, CC, T);
8708 // Check implicit argument conversions for function calls.
8709 if (CallExpr *Call = dyn_cast<CallExpr>(E))
8710 CheckImplicitArgumentConversions(S, Call, CC);
8712 // Go ahead and check any implicit conversions we might have skipped.
8713 // The non-canonical typecheck is just an optimization;
8714 // CheckImplicitConversion will filter out dead implicit conversions.
8715 if (E->getType() != T)
8716 CheckImplicitConversion(S, E, T, CC);
8718 // Now continue drilling into this expression.
8720 if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
8721 // The bound subexpressions in a PseudoObjectExpr are not reachable
8722 // as transitive children.
8723 // FIXME: Use a more uniform representation for this.
8724 for (auto *SE : POE->semantics())
8725 if (auto *OVE = dyn_cast<OpaqueValueExpr>(SE))
8726 AnalyzeImplicitConversions(S, OVE->getSourceExpr(), CC);
8729 // Skip past explicit casts.
8730 if (isa<ExplicitCastExpr>(E)) {
8731 E = cast<ExplicitCastExpr>(E)->getSubExpr()->IgnoreParenImpCasts();
8732 return AnalyzeImplicitConversions(S, E, CC);
8735 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
8736 // Do a somewhat different check with comparison operators.
8737 if (BO->isComparisonOp())
8738 return AnalyzeComparison(S, BO);
8740 // And with simple assignments.
8741 if (BO->getOpcode() == BO_Assign)
8742 return AnalyzeAssignment(S, BO);
8745 // These break the otherwise-useful invariant below. Fortunately,
8746 // we don't really need to recurse into them, because any internal
8747 // expressions should have been analyzed already when they were
8748 // built into statements.
8749 if (isa<StmtExpr>(E)) return;
8751 // Don't descend into unevaluated contexts.
8752 if (isa<UnaryExprOrTypeTraitExpr>(E)) return;
8754 // Now just recurse over the expression's children.
8755 CC = E->getExprLoc();
8756 BinaryOperator *BO = dyn_cast<BinaryOperator>(E);
8757 bool IsLogicalAndOperator = BO && BO->getOpcode() == BO_LAnd;
8758 for (Stmt *SubStmt : E->children()) {
8759 Expr *ChildExpr = dyn_cast_or_null<Expr>(SubStmt);
8763 if (IsLogicalAndOperator &&
8764 isa<StringLiteral>(ChildExpr->IgnoreParenImpCasts()))
8765 // Ignore checking string literals that are in logical and operators.
8766 // This is a common pattern for asserts.
8768 AnalyzeImplicitConversions(S, ChildExpr, CC);
8771 if (BO && BO->isLogicalOp()) {
8772 Expr *SubExpr = BO->getLHS()->IgnoreParenImpCasts();
8773 if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
8774 ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
8776 SubExpr = BO->getRHS()->IgnoreParenImpCasts();
8777 if (!IsLogicalAndOperator || !isa<StringLiteral>(SubExpr))
8778 ::CheckBoolLikeConversion(S, SubExpr, BO->getExprLoc());
8781 if (const UnaryOperator *U = dyn_cast<UnaryOperator>(E))
8782 if (U->getOpcode() == UO_LNot)
8783 ::CheckBoolLikeConversion(S, U->getSubExpr(), CC);
8786 } // end anonymous namespace
8788 static bool checkOpenCLEnqueueLocalSizeArgs(Sema &S, CallExpr *TheCall,
8789 unsigned Start, unsigned End) {
8790 bool IllegalParams = false;
8791 for (unsigned I = Start; I <= End; ++I) {
8792 QualType Ty = TheCall->getArg(I)->getType();
8793 // Taking into account implicit conversions,
8794 // allow any integer within 32 bits range
8795 if (!Ty->isIntegerType() ||
8796 S.Context.getTypeSizeInChars(Ty).getQuantity() > 4) {
8797 S.Diag(TheCall->getArg(I)->getLocStart(),
8798 diag::err_opencl_enqueue_kernel_invalid_local_size_type);
8799 IllegalParams = true;
8801 // Potentially emit standard warnings for implicit conversions if enabled
8802 // using -Wconversion.
8803 CheckImplicitConversion(S, TheCall->getArg(I), S.Context.UnsignedIntTy,
8804 TheCall->getArg(I)->getLocStart());
8806 return IllegalParams;
8809 // Helper function for Sema::DiagnoseAlwaysNonNullPointer.
8810 // Returns true when emitting a warning about taking the address of a reference.
8811 static bool CheckForReference(Sema &SemaRef, const Expr *E,
8812 const PartialDiagnostic &PD) {
8813 E = E->IgnoreParenImpCasts();
8815 const FunctionDecl *FD = nullptr;
8817 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
8818 if (!DRE->getDecl()->getType()->isReferenceType())
8820 } else if (const MemberExpr *M = dyn_cast<MemberExpr>(E)) {
8821 if (!M->getMemberDecl()->getType()->isReferenceType())
8823 } else if (const CallExpr *Call = dyn_cast<CallExpr>(E)) {
8824 if (!Call->getCallReturnType(SemaRef.Context)->isReferenceType())
8826 FD = Call->getDirectCallee();
8831 SemaRef.Diag(E->getExprLoc(), PD);
8833 // If possible, point to location of function.
8835 SemaRef.Diag(FD->getLocation(), diag::note_reference_is_return_value) << FD;
8841 // Returns true if the SourceLocation is expanded from any macro body.
8842 // Returns false if the SourceLocation is invalid, is from not in a macro
8843 // expansion, or is from expanded from a top-level macro argument.
8844 static bool IsInAnyMacroBody(const SourceManager &SM, SourceLocation Loc) {
8845 if (Loc.isInvalid())
8848 while (Loc.isMacroID()) {
8849 if (SM.isMacroBodyExpansion(Loc))
8851 Loc = SM.getImmediateMacroCallerLoc(Loc);
8857 /// \brief Diagnose pointers that are always non-null.
8858 /// \param E the expression containing the pointer
8859 /// \param NullKind NPCK_NotNull if E is a cast to bool, otherwise, E is
8860 /// compared to a null pointer
8861 /// \param IsEqual True when the comparison is equal to a null pointer
8862 /// \param Range Extra SourceRange to highlight in the diagnostic
8863 void Sema::DiagnoseAlwaysNonNullPointer(Expr *E,
8864 Expr::NullPointerConstantKind NullKind,
8865 bool IsEqual, SourceRange Range) {
8869 // Don't warn inside macros.
8870 if (E->getExprLoc().isMacroID()) {
8871 const SourceManager &SM = getSourceManager();
8872 if (IsInAnyMacroBody(SM, E->getExprLoc()) ||
8873 IsInAnyMacroBody(SM, Range.getBegin()))
8876 E = E->IgnoreImpCasts();
8878 const bool IsCompare = NullKind != Expr::NPCK_NotNull;
8880 if (isa<CXXThisExpr>(E)) {
8881 unsigned DiagID = IsCompare ? diag::warn_this_null_compare
8882 : diag::warn_this_bool_conversion;
8883 Diag(E->getExprLoc(), DiagID) << E->getSourceRange() << Range << IsEqual;
8887 bool IsAddressOf = false;
8889 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
8890 if (UO->getOpcode() != UO_AddrOf)
8893 E = UO->getSubExpr();
8897 unsigned DiagID = IsCompare
8898 ? diag::warn_address_of_reference_null_compare
8899 : diag::warn_address_of_reference_bool_conversion;
8900 PartialDiagnostic PD = PDiag(DiagID) << E->getSourceRange() << Range
8902 if (CheckForReference(*this, E, PD)) {
8907 auto ComplainAboutNonnullParamOrCall = [&](const Attr *NonnullAttr) {
8908 bool IsParam = isa<NonNullAttr>(NonnullAttr);
8910 llvm::raw_string_ostream S(Str);
8911 E->printPretty(S, nullptr, getPrintingPolicy());
8912 unsigned DiagID = IsCompare ? diag::warn_nonnull_expr_compare
8913 : diag::warn_cast_nonnull_to_bool;
8914 Diag(E->getExprLoc(), DiagID) << IsParam << S.str()
8915 << E->getSourceRange() << Range << IsEqual;
8916 Diag(NonnullAttr->getLocation(), diag::note_declared_nonnull) << IsParam;
8919 // If we have a CallExpr that is tagged with returns_nonnull, we can complain.
8920 if (auto *Call = dyn_cast<CallExpr>(E->IgnoreParenImpCasts())) {
8921 if (auto *Callee = Call->getDirectCallee()) {
8922 if (const Attr *A = Callee->getAttr<ReturnsNonNullAttr>()) {
8923 ComplainAboutNonnullParamOrCall(A);
8929 // Expect to find a single Decl. Skip anything more complicated.
8930 ValueDecl *D = nullptr;
8931 if (DeclRefExpr *R = dyn_cast<DeclRefExpr>(E)) {
8933 } else if (MemberExpr *M = dyn_cast<MemberExpr>(E)) {
8934 D = M->getMemberDecl();
8937 // Weak Decls can be null.
8938 if (!D || D->isWeak())
8941 // Check for parameter decl with nonnull attribute
8942 if (const auto* PV = dyn_cast<ParmVarDecl>(D)) {
8943 if (getCurFunction() &&
8944 !getCurFunction()->ModifiedNonNullParams.count(PV)) {
8945 if (const Attr *A = PV->getAttr<NonNullAttr>()) {
8946 ComplainAboutNonnullParamOrCall(A);
8950 if (const auto *FD = dyn_cast<FunctionDecl>(PV->getDeclContext())) {
8951 auto ParamIter = llvm::find(FD->parameters(), PV);
8952 assert(ParamIter != FD->param_end());
8953 unsigned ParamNo = std::distance(FD->param_begin(), ParamIter);
8955 for (const auto *NonNull : FD->specific_attrs<NonNullAttr>()) {
8956 if (!NonNull->args_size()) {
8957 ComplainAboutNonnullParamOrCall(NonNull);
8961 for (unsigned ArgNo : NonNull->args()) {
8962 if (ArgNo == ParamNo) {
8963 ComplainAboutNonnullParamOrCall(NonNull);
8972 QualType T = D->getType();
8973 const bool IsArray = T->isArrayType();
8974 const bool IsFunction = T->isFunctionType();
8976 // Address of function is used to silence the function warning.
8977 if (IsAddressOf && IsFunction) {
8982 if (!IsAddressOf && !IsFunction && !IsArray)
8985 // Pretty print the expression for the diagnostic.
8987 llvm::raw_string_ostream S(Str);
8988 E->printPretty(S, nullptr, getPrintingPolicy());
8990 unsigned DiagID = IsCompare ? diag::warn_null_pointer_compare
8991 : diag::warn_impcast_pointer_to_bool;
8998 DiagType = AddressOf;
8999 else if (IsFunction)
9000 DiagType = FunctionPointer;
9002 DiagType = ArrayPointer;
9004 llvm_unreachable("Could not determine diagnostic.");
9005 Diag(E->getExprLoc(), DiagID) << DiagType << S.str() << E->getSourceRange()
9006 << Range << IsEqual;
9011 // Suggest '&' to silence the function warning.
9012 Diag(E->getExprLoc(), diag::note_function_warning_silence)
9013 << FixItHint::CreateInsertion(E->getLocStart(), "&");
9015 // Check to see if '()' fixit should be emitted.
9016 QualType ReturnType;
9017 UnresolvedSet<4> NonTemplateOverloads;
9018 tryExprAsCall(*E, ReturnType, NonTemplateOverloads);
9019 if (ReturnType.isNull())
9023 // There are two cases here. If there is null constant, the only suggest
9024 // for a pointer return type. If the null is 0, then suggest if the return
9025 // type is a pointer or an integer type.
9026 if (!ReturnType->isPointerType()) {
9027 if (NullKind == Expr::NPCK_ZeroExpression ||
9028 NullKind == Expr::NPCK_ZeroLiteral) {
9029 if (!ReturnType->isIntegerType())
9035 } else { // !IsCompare
9036 // For function to bool, only suggest if the function pointer has bool
9038 if (!ReturnType->isSpecificBuiltinType(BuiltinType::Bool))
9041 Diag(E->getExprLoc(), diag::note_function_to_function_call)
9042 << FixItHint::CreateInsertion(getLocForEndOfToken(E->getLocEnd()), "()");
9045 /// Diagnoses "dangerous" implicit conversions within the given
9046 /// expression (which is a full expression). Implements -Wconversion
9047 /// and -Wsign-compare.
9049 /// \param CC the "context" location of the implicit conversion, i.e.
9050 /// the most location of the syntactic entity requiring the implicit
9052 void Sema::CheckImplicitConversions(Expr *E, SourceLocation CC) {
9053 // Don't diagnose in unevaluated contexts.
9054 if (isUnevaluatedContext())
9057 // Don't diagnose for value- or type-dependent expressions.
9058 if (E->isTypeDependent() || E->isValueDependent())
9061 // Check for array bounds violations in cases where the check isn't triggered
9062 // elsewhere for other Expr types (like BinaryOperators), e.g. when an
9063 // ArraySubscriptExpr is on the RHS of a variable initialization.
9064 CheckArrayAccess(E);
9066 // This is not the right CC for (e.g.) a variable initialization.
9067 AnalyzeImplicitConversions(*this, E, CC);
9070 /// CheckBoolLikeConversion - Check conversion of given expression to boolean.
9071 /// Input argument E is a logical expression.
9072 void Sema::CheckBoolLikeConversion(Expr *E, SourceLocation CC) {
9073 ::CheckBoolLikeConversion(*this, E, CC);
9076 /// Diagnose when expression is an integer constant expression and its evaluation
9077 /// results in integer overflow
9078 void Sema::CheckForIntOverflow (Expr *E) {
9079 // Use a work list to deal with nested struct initializers.
9080 SmallVector<Expr *, 2> Exprs(1, E);
9083 Expr *E = Exprs.pop_back_val();
9085 if (isa<BinaryOperator>(E->IgnoreParenCasts())) {
9086 E->IgnoreParenCasts()->EvaluateForOverflow(Context);
9090 if (auto InitList = dyn_cast<InitListExpr>(E))
9091 Exprs.append(InitList->inits().begin(), InitList->inits().end());
9092 } while (!Exprs.empty());
9096 /// \brief Visitor for expressions which looks for unsequenced operations on the
9098 class SequenceChecker : public EvaluatedExprVisitor<SequenceChecker> {
9099 typedef EvaluatedExprVisitor<SequenceChecker> Base;
9101 /// \brief A tree of sequenced regions within an expression. Two regions are
9102 /// unsequenced if one is an ancestor or a descendent of the other. When we
9103 /// finish processing an expression with sequencing, such as a comma
9104 /// expression, we fold its tree nodes into its parent, since they are
9105 /// unsequenced with respect to nodes we will visit later.
9106 class SequenceTree {
9108 explicit Value(unsigned Parent) : Parent(Parent), Merged(false) {}
9109 unsigned Parent : 31;
9110 unsigned Merged : 1;
9112 SmallVector<Value, 8> Values;
9115 /// \brief A region within an expression which may be sequenced with respect
9116 /// to some other region.
9118 explicit Seq(unsigned N) : Index(N) {}
9120 friend class SequenceTree;
9125 SequenceTree() { Values.push_back(Value(0)); }
9126 Seq root() const { return Seq(0); }
9128 /// \brief Create a new sequence of operations, which is an unsequenced
9129 /// subset of \p Parent. This sequence of operations is sequenced with
9130 /// respect to other children of \p Parent.
9131 Seq allocate(Seq Parent) {
9132 Values.push_back(Value(Parent.Index));
9133 return Seq(Values.size() - 1);
9136 /// \brief Merge a sequence of operations into its parent.
9138 Values[S.Index].Merged = true;
9141 /// \brief Determine whether two operations are unsequenced. This operation
9142 /// is asymmetric: \p Cur should be the more recent sequence, and \p Old
9143 /// should have been merged into its parent as appropriate.
9144 bool isUnsequenced(Seq Cur, Seq Old) {
9145 unsigned C = representative(Cur.Index);
9146 unsigned Target = representative(Old.Index);
9147 while (C >= Target) {
9150 C = Values[C].Parent;
9156 /// \brief Pick a representative for a sequence.
9157 unsigned representative(unsigned K) {
9158 if (Values[K].Merged)
9159 // Perform path compression as we go.
9160 return Values[K].Parent = representative(Values[K].Parent);
9165 /// An object for which we can track unsequenced uses.
9166 typedef NamedDecl *Object;
9168 /// Different flavors of object usage which we track. We only track the
9169 /// least-sequenced usage of each kind.
9171 /// A read of an object. Multiple unsequenced reads are OK.
9173 /// A modification of an object which is sequenced before the value
9174 /// computation of the expression, such as ++n in C++.
9176 /// A modification of an object which is not sequenced before the value
9177 /// computation of the expression, such as n++.
9180 UK_Count = UK_ModAsSideEffect + 1
9184 Usage() : Use(nullptr), Seq() {}
9186 SequenceTree::Seq Seq;
9190 UsageInfo() : Diagnosed(false) {}
9191 Usage Uses[UK_Count];
9192 /// Have we issued a diagnostic for this variable already?
9195 typedef llvm::SmallDenseMap<Object, UsageInfo, 16> UsageInfoMap;
9198 /// Sequenced regions within the expression.
9200 /// Declaration modifications and references which we have seen.
9201 UsageInfoMap UsageMap;
9202 /// The region we are currently within.
9203 SequenceTree::Seq Region;
9204 /// Filled in with declarations which were modified as a side-effect
9205 /// (that is, post-increment operations).
9206 SmallVectorImpl<std::pair<Object, Usage> > *ModAsSideEffect;
9207 /// Expressions to check later. We defer checking these to reduce
9209 SmallVectorImpl<Expr *> &WorkList;
9211 /// RAII object wrapping the visitation of a sequenced subexpression of an
9212 /// expression. At the end of this process, the side-effects of the evaluation
9213 /// become sequenced with respect to the value computation of the result, so
9214 /// we downgrade any UK_ModAsSideEffect within the evaluation to
9216 struct SequencedSubexpression {
9217 SequencedSubexpression(SequenceChecker &Self)
9218 : Self(Self), OldModAsSideEffect(Self.ModAsSideEffect) {
9219 Self.ModAsSideEffect = &ModAsSideEffect;
9221 ~SequencedSubexpression() {
9222 for (auto &M : llvm::reverse(ModAsSideEffect)) {
9223 UsageInfo &U = Self.UsageMap[M.first];
9224 auto &SideEffectUsage = U.Uses[UK_ModAsSideEffect];
9225 Self.addUsage(U, M.first, SideEffectUsage.Use, UK_ModAsValue);
9226 SideEffectUsage = M.second;
9228 Self.ModAsSideEffect = OldModAsSideEffect;
9231 SequenceChecker &Self;
9232 SmallVector<std::pair<Object, Usage>, 4> ModAsSideEffect;
9233 SmallVectorImpl<std::pair<Object, Usage> > *OldModAsSideEffect;
9236 /// RAII object wrapping the visitation of a subexpression which we might
9237 /// choose to evaluate as a constant. If any subexpression is evaluated and
9238 /// found to be non-constant, this allows us to suppress the evaluation of
9239 /// the outer expression.
9240 class EvaluationTracker {
9242 EvaluationTracker(SequenceChecker &Self)
9243 : Self(Self), Prev(Self.EvalTracker), EvalOK(true) {
9244 Self.EvalTracker = this;
9246 ~EvaluationTracker() {
9247 Self.EvalTracker = Prev;
9249 Prev->EvalOK &= EvalOK;
9252 bool evaluate(const Expr *E, bool &Result) {
9253 if (!EvalOK || E->isValueDependent())
9255 EvalOK = E->EvaluateAsBooleanCondition(Result, Self.SemaRef.Context);
9260 SequenceChecker &Self;
9261 EvaluationTracker *Prev;
9265 /// \brief Find the object which is produced by the specified expression,
9267 Object getObject(Expr *E, bool Mod) const {
9268 E = E->IgnoreParenCasts();
9269 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
9270 if (Mod && (UO->getOpcode() == UO_PreInc || UO->getOpcode() == UO_PreDec))
9271 return getObject(UO->getSubExpr(), Mod);
9272 } else if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
9273 if (BO->getOpcode() == BO_Comma)
9274 return getObject(BO->getRHS(), Mod);
9275 if (Mod && BO->isAssignmentOp())
9276 return getObject(BO->getLHS(), Mod);
9277 } else if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
9278 // FIXME: Check for more interesting cases, like "x.n = ++x.n".
9279 if (isa<CXXThisExpr>(ME->getBase()->IgnoreParenCasts()))
9280 return ME->getMemberDecl();
9281 } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
9282 // FIXME: If this is a reference, map through to its value.
9283 return DRE->getDecl();
9287 /// \brief Note that an object was modified or used by an expression.
9288 void addUsage(UsageInfo &UI, Object O, Expr *Ref, UsageKind UK) {
9289 Usage &U = UI.Uses[UK];
9290 if (!U.Use || !Tree.isUnsequenced(Region, U.Seq)) {
9291 if (UK == UK_ModAsSideEffect && ModAsSideEffect)
9292 ModAsSideEffect->push_back(std::make_pair(O, U));
9297 /// \brief Check whether a modification or use conflicts with a prior usage.
9298 void checkUsage(Object O, UsageInfo &UI, Expr *Ref, UsageKind OtherKind,
9303 const Usage &U = UI.Uses[OtherKind];
9304 if (!U.Use || !Tree.isUnsequenced(Region, U.Seq))
9308 Expr *ModOrUse = Ref;
9309 if (OtherKind == UK_Use)
9310 std::swap(Mod, ModOrUse);
9312 SemaRef.Diag(Mod->getExprLoc(),
9313 IsModMod ? diag::warn_unsequenced_mod_mod
9314 : diag::warn_unsequenced_mod_use)
9315 << O << SourceRange(ModOrUse->getExprLoc());
9316 UI.Diagnosed = true;
9319 void notePreUse(Object O, Expr *Use) {
9320 UsageInfo &U = UsageMap[O];
9321 // Uses conflict with other modifications.
9322 checkUsage(O, U, Use, UK_ModAsValue, false);
9324 void notePostUse(Object O, Expr *Use) {
9325 UsageInfo &U = UsageMap[O];
9326 checkUsage(O, U, Use, UK_ModAsSideEffect, false);
9327 addUsage(U, O, Use, UK_Use);
9330 void notePreMod(Object O, Expr *Mod) {
9331 UsageInfo &U = UsageMap[O];
9332 // Modifications conflict with other modifications and with uses.
9333 checkUsage(O, U, Mod, UK_ModAsValue, true);
9334 checkUsage(O, U, Mod, UK_Use, false);
9336 void notePostMod(Object O, Expr *Use, UsageKind UK) {
9337 UsageInfo &U = UsageMap[O];
9338 checkUsage(O, U, Use, UK_ModAsSideEffect, true);
9339 addUsage(U, O, Use, UK);
9343 SequenceChecker(Sema &S, Expr *E, SmallVectorImpl<Expr *> &WorkList)
9344 : Base(S.Context), SemaRef(S), Region(Tree.root()),
9345 ModAsSideEffect(nullptr), WorkList(WorkList), EvalTracker(nullptr) {
9349 void VisitStmt(Stmt *S) {
9350 // Skip all statements which aren't expressions for now.
9353 void VisitExpr(Expr *E) {
9354 // By default, just recurse to evaluated subexpressions.
9358 void VisitCastExpr(CastExpr *E) {
9359 Object O = Object();
9360 if (E->getCastKind() == CK_LValueToRValue)
9361 O = getObject(E->getSubExpr(), false);
9370 void VisitBinComma(BinaryOperator *BO) {
9371 // C++11 [expr.comma]p1:
9372 // Every value computation and side effect associated with the left
9373 // expression is sequenced before every value computation and side
9374 // effect associated with the right expression.
9375 SequenceTree::Seq LHS = Tree.allocate(Region);
9376 SequenceTree::Seq RHS = Tree.allocate(Region);
9377 SequenceTree::Seq OldRegion = Region;
9380 SequencedSubexpression SeqLHS(*this);
9382 Visit(BO->getLHS());
9386 Visit(BO->getRHS());
9390 // Forget that LHS and RHS are sequenced. They are both unsequenced
9391 // with respect to other stuff.
9396 void VisitBinAssign(BinaryOperator *BO) {
9397 // The modification is sequenced after the value computation of the LHS
9398 // and RHS, so check it before inspecting the operands and update the
9400 Object O = getObject(BO->getLHS(), true);
9402 return VisitExpr(BO);
9406 // C++11 [expr.ass]p7:
9407 // E1 op= E2 is equivalent to E1 = E1 op E2, except that E1 is evaluated
9410 // Therefore, for a compound assignment operator, O is considered used
9411 // everywhere except within the evaluation of E1 itself.
9412 if (isa<CompoundAssignOperator>(BO))
9415 Visit(BO->getLHS());
9417 if (isa<CompoundAssignOperator>(BO))
9420 Visit(BO->getRHS());
9422 // C++11 [expr.ass]p1:
9423 // the assignment is sequenced [...] before the value computation of the
9424 // assignment expression.
9425 // C11 6.5.16/3 has no such rule.
9426 notePostMod(O, BO, SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
9427 : UK_ModAsSideEffect);
9430 void VisitCompoundAssignOperator(CompoundAssignOperator *CAO) {
9431 VisitBinAssign(CAO);
9434 void VisitUnaryPreInc(UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
9435 void VisitUnaryPreDec(UnaryOperator *UO) { VisitUnaryPreIncDec(UO); }
9436 void VisitUnaryPreIncDec(UnaryOperator *UO) {
9437 Object O = getObject(UO->getSubExpr(), true);
9439 return VisitExpr(UO);
9442 Visit(UO->getSubExpr());
9443 // C++11 [expr.pre.incr]p1:
9444 // the expression ++x is equivalent to x+=1
9445 notePostMod(O, UO, SemaRef.getLangOpts().CPlusPlus ? UK_ModAsValue
9446 : UK_ModAsSideEffect);
9449 void VisitUnaryPostInc(UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
9450 void VisitUnaryPostDec(UnaryOperator *UO) { VisitUnaryPostIncDec(UO); }
9451 void VisitUnaryPostIncDec(UnaryOperator *UO) {
9452 Object O = getObject(UO->getSubExpr(), true);
9454 return VisitExpr(UO);
9457 Visit(UO->getSubExpr());
9458 notePostMod(O, UO, UK_ModAsSideEffect);
9461 /// Don't visit the RHS of '&&' or '||' if it might not be evaluated.
9462 void VisitBinLOr(BinaryOperator *BO) {
9463 // The side-effects of the LHS of an '&&' are sequenced before the
9464 // value computation of the RHS, and hence before the value computation
9465 // of the '&&' itself, unless the LHS evaluates to zero. We treat them
9466 // as if they were unconditionally sequenced.
9467 EvaluationTracker Eval(*this);
9469 SequencedSubexpression Sequenced(*this);
9470 Visit(BO->getLHS());
9474 if (Eval.evaluate(BO->getLHS(), Result)) {
9476 Visit(BO->getRHS());
9478 // Check for unsequenced operations in the RHS, treating it as an
9479 // entirely separate evaluation.
9481 // FIXME: If there are operations in the RHS which are unsequenced
9482 // with respect to operations outside the RHS, and those operations
9483 // are unconditionally evaluated, diagnose them.
9484 WorkList.push_back(BO->getRHS());
9487 void VisitBinLAnd(BinaryOperator *BO) {
9488 EvaluationTracker Eval(*this);
9490 SequencedSubexpression Sequenced(*this);
9491 Visit(BO->getLHS());
9495 if (Eval.evaluate(BO->getLHS(), Result)) {
9497 Visit(BO->getRHS());
9499 WorkList.push_back(BO->getRHS());
9503 // Only visit the condition, unless we can be sure which subexpression will
9505 void VisitAbstractConditionalOperator(AbstractConditionalOperator *CO) {
9506 EvaluationTracker Eval(*this);
9508 SequencedSubexpression Sequenced(*this);
9509 Visit(CO->getCond());
9513 if (Eval.evaluate(CO->getCond(), Result))
9514 Visit(Result ? CO->getTrueExpr() : CO->getFalseExpr());
9516 WorkList.push_back(CO->getTrueExpr());
9517 WorkList.push_back(CO->getFalseExpr());
9521 void VisitCallExpr(CallExpr *CE) {
9522 // C++11 [intro.execution]p15:
9523 // When calling a function [...], every value computation and side effect
9524 // associated with any argument expression, or with the postfix expression
9525 // designating the called function, is sequenced before execution of every
9526 // expression or statement in the body of the function [and thus before
9527 // the value computation of its result].
9528 SequencedSubexpression Sequenced(*this);
9529 Base::VisitCallExpr(CE);
9531 // FIXME: CXXNewExpr and CXXDeleteExpr implicitly call functions.
9534 void VisitCXXConstructExpr(CXXConstructExpr *CCE) {
9535 // This is a call, so all subexpressions are sequenced before the result.
9536 SequencedSubexpression Sequenced(*this);
9538 if (!CCE->isListInitialization())
9539 return VisitExpr(CCE);
9541 // In C++11, list initializations are sequenced.
9542 SmallVector<SequenceTree::Seq, 32> Elts;
9543 SequenceTree::Seq Parent = Region;
9544 for (CXXConstructExpr::arg_iterator I = CCE->arg_begin(),
9547 Region = Tree.allocate(Parent);
9548 Elts.push_back(Region);
9552 // Forget that the initializers are sequenced.
9554 for (unsigned I = 0; I < Elts.size(); ++I)
9555 Tree.merge(Elts[I]);
9558 void VisitInitListExpr(InitListExpr *ILE) {
9559 if (!SemaRef.getLangOpts().CPlusPlus11)
9560 return VisitExpr(ILE);
9562 // In C++11, list initializations are sequenced.
9563 SmallVector<SequenceTree::Seq, 32> Elts;
9564 SequenceTree::Seq Parent = Region;
9565 for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
9566 Expr *E = ILE->getInit(I);
9568 Region = Tree.allocate(Parent);
9569 Elts.push_back(Region);
9573 // Forget that the initializers are sequenced.
9575 for (unsigned I = 0; I < Elts.size(); ++I)
9576 Tree.merge(Elts[I]);
9579 } // end anonymous namespace
9581 void Sema::CheckUnsequencedOperations(Expr *E) {
9582 SmallVector<Expr *, 8> WorkList;
9583 WorkList.push_back(E);
9584 while (!WorkList.empty()) {
9585 Expr *Item = WorkList.pop_back_val();
9586 SequenceChecker(*this, Item, WorkList);
9590 void Sema::CheckCompletedExpr(Expr *E, SourceLocation CheckLoc,
9592 CheckImplicitConversions(E, CheckLoc);
9593 if (!E->isInstantiationDependent())
9594 CheckUnsequencedOperations(E);
9595 if (!IsConstexpr && !E->isValueDependent())
9596 CheckForIntOverflow(E);
9599 void Sema::CheckBitFieldInitialization(SourceLocation InitLoc,
9600 FieldDecl *BitField,
9602 (void) AnalyzeBitFieldAssignment(*this, BitField, Init, InitLoc);
9605 static void diagnoseArrayStarInParamType(Sema &S, QualType PType,
9606 SourceLocation Loc) {
9607 if (!PType->isVariablyModifiedType())
9609 if (const auto *PointerTy = dyn_cast<PointerType>(PType)) {
9610 diagnoseArrayStarInParamType(S, PointerTy->getPointeeType(), Loc);
9613 if (const auto *ReferenceTy = dyn_cast<ReferenceType>(PType)) {
9614 diagnoseArrayStarInParamType(S, ReferenceTy->getPointeeType(), Loc);
9617 if (const auto *ParenTy = dyn_cast<ParenType>(PType)) {
9618 diagnoseArrayStarInParamType(S, ParenTy->getInnerType(), Loc);
9622 const ArrayType *AT = S.Context.getAsArrayType(PType);
9626 if (AT->getSizeModifier() != ArrayType::Star) {
9627 diagnoseArrayStarInParamType(S, AT->getElementType(), Loc);
9631 S.Diag(Loc, diag::err_array_star_in_function_definition);
9634 /// CheckParmsForFunctionDef - Check that the parameters of the given
9635 /// function are appropriate for the definition of a function. This
9636 /// takes care of any checks that cannot be performed on the
9637 /// declaration itself, e.g., that the types of each of the function
9638 /// parameters are complete.
9639 bool Sema::CheckParmsForFunctionDef(ArrayRef<ParmVarDecl *> Parameters,
9640 bool CheckParameterNames) {
9641 bool HasInvalidParm = false;
9642 for (ParmVarDecl *Param : Parameters) {
9643 // C99 6.7.5.3p4: the parameters in a parameter type list in a
9644 // function declarator that is part of a function definition of
9645 // that function shall not have incomplete type.
9647 // This is also C++ [dcl.fct]p6.
9648 if (!Param->isInvalidDecl() &&
9649 RequireCompleteType(Param->getLocation(), Param->getType(),
9650 diag::err_typecheck_decl_incomplete_type)) {
9651 Param->setInvalidDecl();
9652 HasInvalidParm = true;
9655 // C99 6.9.1p5: If the declarator includes a parameter type list, the
9656 // declaration of each parameter shall include an identifier.
9657 if (CheckParameterNames &&
9658 Param->getIdentifier() == nullptr &&
9659 !Param->isImplicit() &&
9660 !getLangOpts().CPlusPlus)
9661 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
9664 // If the function declarator is not part of a definition of that
9665 // function, parameters may have incomplete type and may use the [*]
9666 // notation in their sequences of declarator specifiers to specify
9667 // variable length array types.
9668 QualType PType = Param->getOriginalType();
9669 // FIXME: This diagnostic should point the '[*]' if source-location
9670 // information is added for it.
9671 diagnoseArrayStarInParamType(*this, PType, Param->getLocation());
9673 // MSVC destroys objects passed by value in the callee. Therefore a
9674 // function definition which takes such a parameter must be able to call the
9675 // object's destructor. However, we don't perform any direct access check
9677 if (getLangOpts().CPlusPlus && Context.getTargetInfo()
9679 .areArgsDestroyedLeftToRightInCallee()) {
9680 if (!Param->isInvalidDecl()) {
9681 if (const RecordType *RT = Param->getType()->getAs<RecordType>()) {
9682 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
9683 if (!ClassDecl->isInvalidDecl() &&
9684 !ClassDecl->hasIrrelevantDestructor() &&
9685 !ClassDecl->isDependentContext()) {
9686 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl);
9687 MarkFunctionReferenced(Param->getLocation(), Destructor);
9688 DiagnoseUseOfDecl(Destructor, Param->getLocation());
9694 // Parameters with the pass_object_size attribute only need to be marked
9695 // constant at function definitions. Because we lack information about
9696 // whether we're on a declaration or definition when we're instantiating the
9697 // attribute, we need to check for constness here.
9698 if (const auto *Attr = Param->getAttr<PassObjectSizeAttr>())
9699 if (!Param->getType().isConstQualified())
9700 Diag(Param->getLocation(), diag::err_attribute_pointers_only)
9701 << Attr->getSpelling() << 1;
9704 return HasInvalidParm;
9707 /// CheckCastAlign - Implements -Wcast-align, which warns when a
9708 /// pointer cast increases the alignment requirements.
9709 void Sema::CheckCastAlign(Expr *Op, QualType T, SourceRange TRange) {
9710 // This is actually a lot of work to potentially be doing on every
9711 // cast; don't do it if we're ignoring -Wcast_align (as is the default).
9712 if (getDiagnostics().isIgnored(diag::warn_cast_align, TRange.getBegin()))
9715 // Ignore dependent types.
9716 if (T->isDependentType() || Op->getType()->isDependentType())
9719 // Require that the destination be a pointer type.
9720 const PointerType *DestPtr = T->getAs<PointerType>();
9721 if (!DestPtr) return;
9723 // If the destination has alignment 1, we're done.
9724 QualType DestPointee = DestPtr->getPointeeType();
9725 if (DestPointee->isIncompleteType()) return;
9726 CharUnits DestAlign = Context.getTypeAlignInChars(DestPointee);
9727 if (DestAlign.isOne()) return;
9729 // Require that the source be a pointer type.
9730 const PointerType *SrcPtr = Op->getType()->getAs<PointerType>();
9731 if (!SrcPtr) return;
9732 QualType SrcPointee = SrcPtr->getPointeeType();
9734 // Whitelist casts from cv void*. We already implicitly
9735 // whitelisted casts to cv void*, since they have alignment 1.
9736 // Also whitelist casts involving incomplete types, which implicitly
9738 if (SrcPointee->isIncompleteType()) return;
9740 CharUnits SrcAlign = Context.getTypeAlignInChars(SrcPointee);
9741 if (SrcAlign >= DestAlign) return;
9743 Diag(TRange.getBegin(), diag::warn_cast_align)
9744 << Op->getType() << T
9745 << static_cast<unsigned>(SrcAlign.getQuantity())
9746 << static_cast<unsigned>(DestAlign.getQuantity())
9747 << TRange << Op->getSourceRange();
9750 /// \brief Check whether this array fits the idiom of a size-one tail padded
9751 /// array member of a struct.
9753 /// We avoid emitting out-of-bounds access warnings for such arrays as they are
9754 /// commonly used to emulate flexible arrays in C89 code.
9755 static bool IsTailPaddedMemberArray(Sema &S, const llvm::APInt &Size,
9756 const NamedDecl *ND) {
9757 if (Size != 1 || !ND) return false;
9759 const FieldDecl *FD = dyn_cast<FieldDecl>(ND);
9760 if (!FD) return false;
9762 // Don't consider sizes resulting from macro expansions or template argument
9763 // substitution to form C89 tail-padded arrays.
9765 TypeSourceInfo *TInfo = FD->getTypeSourceInfo();
9767 TypeLoc TL = TInfo->getTypeLoc();
9768 // Look through typedefs.
9769 if (TypedefTypeLoc TTL = TL.getAs<TypedefTypeLoc>()) {
9770 const TypedefNameDecl *TDL = TTL.getTypedefNameDecl();
9771 TInfo = TDL->getTypeSourceInfo();
9774 if (ConstantArrayTypeLoc CTL = TL.getAs<ConstantArrayTypeLoc>()) {
9775 const Expr *SizeExpr = dyn_cast<IntegerLiteral>(CTL.getSizeExpr());
9776 if (!SizeExpr || SizeExpr->getExprLoc().isMacroID())
9782 const RecordDecl *RD = dyn_cast<RecordDecl>(FD->getDeclContext());
9783 if (!RD) return false;
9784 if (RD->isUnion()) return false;
9785 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
9786 if (!CRD->isStandardLayout()) return false;
9789 // See if this is the last field decl in the record.
9791 while ((D = D->getNextDeclInContext()))
9792 if (isa<FieldDecl>(D))
9797 void Sema::CheckArrayAccess(const Expr *BaseExpr, const Expr *IndexExpr,
9798 const ArraySubscriptExpr *ASE,
9799 bool AllowOnePastEnd, bool IndexNegated) {
9800 IndexExpr = IndexExpr->IgnoreParenImpCasts();
9801 if (IndexExpr->isValueDependent())
9804 const Type *EffectiveType =
9805 BaseExpr->getType()->getPointeeOrArrayElementType();
9806 BaseExpr = BaseExpr->IgnoreParenCasts();
9807 const ConstantArrayType *ArrayTy =
9808 Context.getAsConstantArrayType(BaseExpr->getType());
9813 if (!IndexExpr->EvaluateAsInt(index, Context, Expr::SE_AllowSideEffects))
9818 const NamedDecl *ND = nullptr;
9819 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
9820 ND = dyn_cast<NamedDecl>(DRE->getDecl());
9821 if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
9822 ND = dyn_cast<NamedDecl>(ME->getMemberDecl());
9824 if (index.isUnsigned() || !index.isNegative()) {
9825 llvm::APInt size = ArrayTy->getSize();
9826 if (!size.isStrictlyPositive())
9829 const Type *BaseType = BaseExpr->getType()->getPointeeOrArrayElementType();
9830 if (BaseType != EffectiveType) {
9831 // Make sure we're comparing apples to apples when comparing index to size
9832 uint64_t ptrarith_typesize = Context.getTypeSize(EffectiveType);
9833 uint64_t array_typesize = Context.getTypeSize(BaseType);
9834 // Handle ptrarith_typesize being zero, such as when casting to void*
9835 if (!ptrarith_typesize) ptrarith_typesize = 1;
9836 if (ptrarith_typesize != array_typesize) {
9837 // There's a cast to a different size type involved
9838 uint64_t ratio = array_typesize / ptrarith_typesize;
9839 // TODO: Be smarter about handling cases where array_typesize is not a
9840 // multiple of ptrarith_typesize
9841 if (ptrarith_typesize * ratio == array_typesize)
9842 size *= llvm::APInt(size.getBitWidth(), ratio);
9846 if (size.getBitWidth() > index.getBitWidth())
9847 index = index.zext(size.getBitWidth());
9848 else if (size.getBitWidth() < index.getBitWidth())
9849 size = size.zext(index.getBitWidth());
9851 // For array subscripting the index must be less than size, but for pointer
9852 // arithmetic also allow the index (offset) to be equal to size since
9853 // computing the next address after the end of the array is legal and
9854 // commonly done e.g. in C++ iterators and range-based for loops.
9855 if (AllowOnePastEnd ? index.ule(size) : index.ult(size))
9858 // Also don't warn for arrays of size 1 which are members of some
9859 // structure. These are often used to approximate flexible arrays in C89
9861 if (IsTailPaddedMemberArray(*this, size, ND))
9864 // Suppress the warning if the subscript expression (as identified by the
9865 // ']' location) and the index expression are both from macro expansions
9866 // within a system header.
9868 SourceLocation RBracketLoc = SourceMgr.getSpellingLoc(
9869 ASE->getRBracketLoc());
9870 if (SourceMgr.isInSystemHeader(RBracketLoc)) {
9871 SourceLocation IndexLoc = SourceMgr.getSpellingLoc(
9872 IndexExpr->getLocStart());
9873 if (SourceMgr.isWrittenInSameFile(RBracketLoc, IndexLoc))
9878 unsigned DiagID = diag::warn_ptr_arith_exceeds_bounds;
9880 DiagID = diag::warn_array_index_exceeds_bounds;
9882 DiagRuntimeBehavior(BaseExpr->getLocStart(), BaseExpr,
9883 PDiag(DiagID) << index.toString(10, true)
9884 << size.toString(10, true)
9885 << (unsigned)size.getLimitedValue(~0U)
9886 << IndexExpr->getSourceRange());
9888 unsigned DiagID = diag::warn_array_index_precedes_bounds;
9890 DiagID = diag::warn_ptr_arith_precedes_bounds;
9891 if (index.isNegative()) index = -index;
9894 DiagRuntimeBehavior(BaseExpr->getLocStart(), BaseExpr,
9895 PDiag(DiagID) << index.toString(10, true)
9896 << IndexExpr->getSourceRange());
9900 // Try harder to find a NamedDecl to point at in the note.
9901 while (const ArraySubscriptExpr *ASE =
9902 dyn_cast<ArraySubscriptExpr>(BaseExpr))
9903 BaseExpr = ASE->getBase()->IgnoreParenCasts();
9904 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
9905 ND = dyn_cast<NamedDecl>(DRE->getDecl());
9906 if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
9907 ND = dyn_cast<NamedDecl>(ME->getMemberDecl());
9911 DiagRuntimeBehavior(ND->getLocStart(), BaseExpr,
9912 PDiag(diag::note_array_index_out_of_bounds)
9913 << ND->getDeclName());
9916 void Sema::CheckArrayAccess(const Expr *expr) {
9917 int AllowOnePastEnd = 0;
9919 expr = expr->IgnoreParenImpCasts();
9920 switch (expr->getStmtClass()) {
9921 case Stmt::ArraySubscriptExprClass: {
9922 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(expr);
9923 CheckArrayAccess(ASE->getBase(), ASE->getIdx(), ASE,
9924 AllowOnePastEnd > 0);
9927 case Stmt::OMPArraySectionExprClass: {
9928 const OMPArraySectionExpr *ASE = cast<OMPArraySectionExpr>(expr);
9929 if (ASE->getLowerBound())
9930 CheckArrayAccess(ASE->getBase(), ASE->getLowerBound(),
9931 /*ASE=*/nullptr, AllowOnePastEnd > 0);
9934 case Stmt::UnaryOperatorClass: {
9935 // Only unwrap the * and & unary operators
9936 const UnaryOperator *UO = cast<UnaryOperator>(expr);
9937 expr = UO->getSubExpr();
9938 switch (UO->getOpcode()) {
9950 case Stmt::ConditionalOperatorClass: {
9951 const ConditionalOperator *cond = cast<ConditionalOperator>(expr);
9952 if (const Expr *lhs = cond->getLHS())
9953 CheckArrayAccess(lhs);
9954 if (const Expr *rhs = cond->getRHS())
9955 CheckArrayAccess(rhs);
9964 //===--- CHECK: Objective-C retain cycles ----------------------------------//
9967 struct RetainCycleOwner {
9968 RetainCycleOwner() : Variable(nullptr), Indirect(false) {}
9974 void setLocsFrom(Expr *e) {
9975 Loc = e->getExprLoc();
9976 Range = e->getSourceRange();
9979 } // end anonymous namespace
9981 /// Consider whether capturing the given variable can possibly lead to
9983 static bool considerVariable(VarDecl *var, Expr *ref, RetainCycleOwner &owner) {
9984 // In ARC, it's captured strongly iff the variable has __strong
9985 // lifetime. In MRR, it's captured strongly if the variable is
9986 // __block and has an appropriate type.
9987 if (var->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
9990 owner.Variable = var;
9992 owner.setLocsFrom(ref);
9996 static bool findRetainCycleOwner(Sema &S, Expr *e, RetainCycleOwner &owner) {
9998 e = e->IgnoreParens();
9999 if (CastExpr *cast = dyn_cast<CastExpr>(e)) {
10000 switch (cast->getCastKind()) {
10002 case CK_LValueBitCast:
10003 case CK_LValueToRValue:
10004 case CK_ARCReclaimReturnedObject:
10005 e = cast->getSubExpr();
10013 if (ObjCIvarRefExpr *ref = dyn_cast<ObjCIvarRefExpr>(e)) {
10014 ObjCIvarDecl *ivar = ref->getDecl();
10015 if (ivar->getType().getObjCLifetime() != Qualifiers::OCL_Strong)
10018 // Try to find a retain cycle in the base.
10019 if (!findRetainCycleOwner(S, ref->getBase(), owner))
10022 if (ref->isFreeIvar()) owner.setLocsFrom(ref);
10023 owner.Indirect = true;
10027 if (DeclRefExpr *ref = dyn_cast<DeclRefExpr>(e)) {
10028 VarDecl *var = dyn_cast<VarDecl>(ref->getDecl());
10029 if (!var) return false;
10030 return considerVariable(var, ref, owner);
10033 if (MemberExpr *member = dyn_cast<MemberExpr>(e)) {
10034 if (member->isArrow()) return false;
10036 // Don't count this as an indirect ownership.
10037 e = member->getBase();
10041 if (PseudoObjectExpr *pseudo = dyn_cast<PseudoObjectExpr>(e)) {
10042 // Only pay attention to pseudo-objects on property references.
10043 ObjCPropertyRefExpr *pre
10044 = dyn_cast<ObjCPropertyRefExpr>(pseudo->getSyntacticForm()
10046 if (!pre) return false;
10047 if (pre->isImplicitProperty()) return false;
10048 ObjCPropertyDecl *property = pre->getExplicitProperty();
10049 if (!property->isRetaining() &&
10050 !(property->getPropertyIvarDecl() &&
10051 property->getPropertyIvarDecl()->getType()
10052 .getObjCLifetime() == Qualifiers::OCL_Strong))
10055 owner.Indirect = true;
10056 if (pre->isSuperReceiver()) {
10057 owner.Variable = S.getCurMethodDecl()->getSelfDecl();
10058 if (!owner.Variable)
10060 owner.Loc = pre->getLocation();
10061 owner.Range = pre->getSourceRange();
10064 e = const_cast<Expr*>(cast<OpaqueValueExpr>(pre->getBase())
10065 ->getSourceExpr());
10076 struct FindCaptureVisitor : EvaluatedExprVisitor<FindCaptureVisitor> {
10077 FindCaptureVisitor(ASTContext &Context, VarDecl *variable)
10078 : EvaluatedExprVisitor<FindCaptureVisitor>(Context),
10079 Context(Context), Variable(variable), Capturer(nullptr),
10080 VarWillBeReased(false) {}
10081 ASTContext &Context;
10084 bool VarWillBeReased;
10086 void VisitDeclRefExpr(DeclRefExpr *ref) {
10087 if (ref->getDecl() == Variable && !Capturer)
10091 void VisitObjCIvarRefExpr(ObjCIvarRefExpr *ref) {
10092 if (Capturer) return;
10093 Visit(ref->getBase());
10094 if (Capturer && ref->isFreeIvar())
10098 void VisitBlockExpr(BlockExpr *block) {
10099 // Look inside nested blocks
10100 if (block->getBlockDecl()->capturesVariable(Variable))
10101 Visit(block->getBlockDecl()->getBody());
10104 void VisitOpaqueValueExpr(OpaqueValueExpr *OVE) {
10105 if (Capturer) return;
10106 if (OVE->getSourceExpr())
10107 Visit(OVE->getSourceExpr());
10109 void VisitBinaryOperator(BinaryOperator *BinOp) {
10110 if (!Variable || VarWillBeReased || BinOp->getOpcode() != BO_Assign)
10112 Expr *LHS = BinOp->getLHS();
10113 if (const DeclRefExpr *DRE = dyn_cast_or_null<DeclRefExpr>(LHS)) {
10114 if (DRE->getDecl() != Variable)
10116 if (Expr *RHS = BinOp->getRHS()) {
10117 RHS = RHS->IgnoreParenCasts();
10118 llvm::APSInt Value;
10120 (RHS && RHS->isIntegerConstantExpr(Value, Context) && Value == 0);
10125 } // end anonymous namespace
10127 /// Check whether the given argument is a block which captures a
10129 static Expr *findCapturingExpr(Sema &S, Expr *e, RetainCycleOwner &owner) {
10130 assert(owner.Variable && owner.Loc.isValid());
10132 e = e->IgnoreParenCasts();
10134 // Look through [^{...} copy] and Block_copy(^{...}).
10135 if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(e)) {
10136 Selector Cmd = ME->getSelector();
10137 if (Cmd.isUnarySelector() && Cmd.getNameForSlot(0) == "copy") {
10138 e = ME->getInstanceReceiver();
10141 e = e->IgnoreParenCasts();
10143 } else if (CallExpr *CE = dyn_cast<CallExpr>(e)) {
10144 if (CE->getNumArgs() == 1) {
10145 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
10147 const IdentifierInfo *FnI = Fn->getIdentifier();
10148 if (FnI && FnI->isStr("_Block_copy")) {
10149 e = CE->getArg(0)->IgnoreParenCasts();
10155 BlockExpr *block = dyn_cast<BlockExpr>(e);
10156 if (!block || !block->getBlockDecl()->capturesVariable(owner.Variable))
10159 FindCaptureVisitor visitor(S.Context, owner.Variable);
10160 visitor.Visit(block->getBlockDecl()->getBody());
10161 return visitor.VarWillBeReased ? nullptr : visitor.Capturer;
10164 static void diagnoseRetainCycle(Sema &S, Expr *capturer,
10165 RetainCycleOwner &owner) {
10167 assert(owner.Variable && owner.Loc.isValid());
10169 S.Diag(capturer->getExprLoc(), diag::warn_arc_retain_cycle)
10170 << owner.Variable << capturer->getSourceRange();
10171 S.Diag(owner.Loc, diag::note_arc_retain_cycle_owner)
10172 << owner.Indirect << owner.Range;
10175 /// Check for a keyword selector that starts with the word 'add' or
10177 static bool isSetterLikeSelector(Selector sel) {
10178 if (sel.isUnarySelector()) return false;
10180 StringRef str = sel.getNameForSlot(0);
10181 while (!str.empty() && str.front() == '_') str = str.substr(1);
10182 if (str.startswith("set"))
10183 str = str.substr(3);
10184 else if (str.startswith("add")) {
10185 // Specially whitelist 'addOperationWithBlock:'.
10186 if (sel.getNumArgs() == 1 && str.startswith("addOperationWithBlock"))
10188 str = str.substr(3);
10193 if (str.empty()) return true;
10194 return !isLowercase(str.front());
10197 static Optional<int> GetNSMutableArrayArgumentIndex(Sema &S,
10198 ObjCMessageExpr *Message) {
10199 bool IsMutableArray = S.NSAPIObj->isSubclassOfNSClass(
10200 Message->getReceiverInterface(),
10201 NSAPI::ClassId_NSMutableArray);
10202 if (!IsMutableArray) {
10206 Selector Sel = Message->getSelector();
10208 Optional<NSAPI::NSArrayMethodKind> MKOpt =
10209 S.NSAPIObj->getNSArrayMethodKind(Sel);
10214 NSAPI::NSArrayMethodKind MK = *MKOpt;
10217 case NSAPI::NSMutableArr_addObject:
10218 case NSAPI::NSMutableArr_insertObjectAtIndex:
10219 case NSAPI::NSMutableArr_setObjectAtIndexedSubscript:
10221 case NSAPI::NSMutableArr_replaceObjectAtIndex:
10232 Optional<int> GetNSMutableDictionaryArgumentIndex(Sema &S,
10233 ObjCMessageExpr *Message) {
10234 bool IsMutableDictionary = S.NSAPIObj->isSubclassOfNSClass(
10235 Message->getReceiverInterface(),
10236 NSAPI::ClassId_NSMutableDictionary);
10237 if (!IsMutableDictionary) {
10241 Selector Sel = Message->getSelector();
10243 Optional<NSAPI::NSDictionaryMethodKind> MKOpt =
10244 S.NSAPIObj->getNSDictionaryMethodKind(Sel);
10249 NSAPI::NSDictionaryMethodKind MK = *MKOpt;
10252 case NSAPI::NSMutableDict_setObjectForKey:
10253 case NSAPI::NSMutableDict_setValueForKey:
10254 case NSAPI::NSMutableDict_setObjectForKeyedSubscript:
10264 static Optional<int> GetNSSetArgumentIndex(Sema &S, ObjCMessageExpr *Message) {
10265 bool IsMutableSet = S.NSAPIObj->isSubclassOfNSClass(
10266 Message->getReceiverInterface(),
10267 NSAPI::ClassId_NSMutableSet);
10269 bool IsMutableOrderedSet = S.NSAPIObj->isSubclassOfNSClass(
10270 Message->getReceiverInterface(),
10271 NSAPI::ClassId_NSMutableOrderedSet);
10272 if (!IsMutableSet && !IsMutableOrderedSet) {
10276 Selector Sel = Message->getSelector();
10278 Optional<NSAPI::NSSetMethodKind> MKOpt = S.NSAPIObj->getNSSetMethodKind(Sel);
10283 NSAPI::NSSetMethodKind MK = *MKOpt;
10286 case NSAPI::NSMutableSet_addObject:
10287 case NSAPI::NSOrderedSet_setObjectAtIndex:
10288 case NSAPI::NSOrderedSet_setObjectAtIndexedSubscript:
10289 case NSAPI::NSOrderedSet_insertObjectAtIndex:
10291 case NSAPI::NSOrderedSet_replaceObjectAtIndexWithObject:
10298 void Sema::CheckObjCCircularContainer(ObjCMessageExpr *Message) {
10299 if (!Message->isInstanceMessage()) {
10303 Optional<int> ArgOpt;
10305 if (!(ArgOpt = GetNSMutableArrayArgumentIndex(*this, Message)) &&
10306 !(ArgOpt = GetNSMutableDictionaryArgumentIndex(*this, Message)) &&
10307 !(ArgOpt = GetNSSetArgumentIndex(*this, Message))) {
10311 int ArgIndex = *ArgOpt;
10313 Expr *Arg = Message->getArg(ArgIndex)->IgnoreImpCasts();
10314 if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Arg)) {
10315 Arg = OE->getSourceExpr()->IgnoreImpCasts();
10318 if (Message->getReceiverKind() == ObjCMessageExpr::SuperInstance) {
10319 if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
10320 if (ArgRE->isObjCSelfExpr()) {
10321 Diag(Message->getSourceRange().getBegin(),
10322 diag::warn_objc_circular_container)
10323 << ArgRE->getDecl()->getName() << StringRef("super");
10327 Expr *Receiver = Message->getInstanceReceiver()->IgnoreImpCasts();
10329 if (OpaqueValueExpr *OE = dyn_cast<OpaqueValueExpr>(Receiver)) {
10330 Receiver = OE->getSourceExpr()->IgnoreImpCasts();
10333 if (DeclRefExpr *ReceiverRE = dyn_cast<DeclRefExpr>(Receiver)) {
10334 if (DeclRefExpr *ArgRE = dyn_cast<DeclRefExpr>(Arg)) {
10335 if (ReceiverRE->getDecl() == ArgRE->getDecl()) {
10336 ValueDecl *Decl = ReceiverRE->getDecl();
10337 Diag(Message->getSourceRange().getBegin(),
10338 diag::warn_objc_circular_container)
10339 << Decl->getName() << Decl->getName();
10340 if (!ArgRE->isObjCSelfExpr()) {
10341 Diag(Decl->getLocation(),
10342 diag::note_objc_circular_container_declared_here)
10343 << Decl->getName();
10347 } else if (ObjCIvarRefExpr *IvarRE = dyn_cast<ObjCIvarRefExpr>(Receiver)) {
10348 if (ObjCIvarRefExpr *IvarArgRE = dyn_cast<ObjCIvarRefExpr>(Arg)) {
10349 if (IvarRE->getDecl() == IvarArgRE->getDecl()) {
10350 ObjCIvarDecl *Decl = IvarRE->getDecl();
10351 Diag(Message->getSourceRange().getBegin(),
10352 diag::warn_objc_circular_container)
10353 << Decl->getName() << Decl->getName();
10354 Diag(Decl->getLocation(),
10355 diag::note_objc_circular_container_declared_here)
10356 << Decl->getName();
10363 /// Check a message send to see if it's likely to cause a retain cycle.
10364 void Sema::checkRetainCycles(ObjCMessageExpr *msg) {
10365 // Only check instance methods whose selector looks like a setter.
10366 if (!msg->isInstanceMessage() || !isSetterLikeSelector(msg->getSelector()))
10369 // Try to find a variable that the receiver is strongly owned by.
10370 RetainCycleOwner owner;
10371 if (msg->getReceiverKind() == ObjCMessageExpr::Instance) {
10372 if (!findRetainCycleOwner(*this, msg->getInstanceReceiver(), owner))
10375 assert(msg->getReceiverKind() == ObjCMessageExpr::SuperInstance);
10376 owner.Variable = getCurMethodDecl()->getSelfDecl();
10377 owner.Loc = msg->getSuperLoc();
10378 owner.Range = msg->getSuperLoc();
10381 // Check whether the receiver is captured by any of the arguments.
10382 for (unsigned i = 0, e = msg->getNumArgs(); i != e; ++i)
10383 if (Expr *capturer = findCapturingExpr(*this, msg->getArg(i), owner))
10384 return diagnoseRetainCycle(*this, capturer, owner);
10387 /// Check a property assign to see if it's likely to cause a retain cycle.
10388 void Sema::checkRetainCycles(Expr *receiver, Expr *argument) {
10389 RetainCycleOwner owner;
10390 if (!findRetainCycleOwner(*this, receiver, owner))
10393 if (Expr *capturer = findCapturingExpr(*this, argument, owner))
10394 diagnoseRetainCycle(*this, capturer, owner);
10397 void Sema::checkRetainCycles(VarDecl *Var, Expr *Init) {
10398 RetainCycleOwner Owner;
10399 if (!considerVariable(Var, /*DeclRefExpr=*/nullptr, Owner))
10402 // Because we don't have an expression for the variable, we have to set the
10403 // location explicitly here.
10404 Owner.Loc = Var->getLocation();
10405 Owner.Range = Var->getSourceRange();
10407 if (Expr *Capturer = findCapturingExpr(*this, Init, Owner))
10408 diagnoseRetainCycle(*this, Capturer, Owner);
10411 static bool checkUnsafeAssignLiteral(Sema &S, SourceLocation Loc,
10412 Expr *RHS, bool isProperty) {
10413 // Check if RHS is an Objective-C object literal, which also can get
10414 // immediately zapped in a weak reference. Note that we explicitly
10415 // allow ObjCStringLiterals, since those are designed to never really die.
10416 RHS = RHS->IgnoreParenImpCasts();
10418 // This enum needs to match with the 'select' in
10419 // warn_objc_arc_literal_assign (off-by-1).
10420 Sema::ObjCLiteralKind Kind = S.CheckLiteralKind(RHS);
10421 if (Kind == Sema::LK_String || Kind == Sema::LK_None)
10424 S.Diag(Loc, diag::warn_arc_literal_assign)
10426 << (isProperty ? 0 : 1)
10427 << RHS->getSourceRange();
10432 static bool checkUnsafeAssignObject(Sema &S, SourceLocation Loc,
10433 Qualifiers::ObjCLifetime LT,
10434 Expr *RHS, bool isProperty) {
10435 // Strip off any implicit cast added to get to the one ARC-specific.
10436 while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
10437 if (cast->getCastKind() == CK_ARCConsumeObject) {
10438 S.Diag(Loc, diag::warn_arc_retained_assign)
10439 << (LT == Qualifiers::OCL_ExplicitNone)
10440 << (isProperty ? 0 : 1)
10441 << RHS->getSourceRange();
10444 RHS = cast->getSubExpr();
10447 if (LT == Qualifiers::OCL_Weak &&
10448 checkUnsafeAssignLiteral(S, Loc, RHS, isProperty))
10454 bool Sema::checkUnsafeAssigns(SourceLocation Loc,
10455 QualType LHS, Expr *RHS) {
10456 Qualifiers::ObjCLifetime LT = LHS.getObjCLifetime();
10458 if (LT != Qualifiers::OCL_Weak && LT != Qualifiers::OCL_ExplicitNone)
10461 if (checkUnsafeAssignObject(*this, Loc, LT, RHS, false))
10467 void Sema::checkUnsafeExprAssigns(SourceLocation Loc,
10468 Expr *LHS, Expr *RHS) {
10470 // PropertyRef on LHS type need be directly obtained from
10471 // its declaration as it has a PseudoType.
10472 ObjCPropertyRefExpr *PRE
10473 = dyn_cast<ObjCPropertyRefExpr>(LHS->IgnoreParens());
10474 if (PRE && !PRE->isImplicitProperty()) {
10475 const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
10477 LHSType = PD->getType();
10480 if (LHSType.isNull())
10481 LHSType = LHS->getType();
10483 Qualifiers::ObjCLifetime LT = LHSType.getObjCLifetime();
10485 if (LT == Qualifiers::OCL_Weak) {
10486 if (!Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, Loc))
10487 getCurFunction()->markSafeWeakUse(LHS);
10490 if (checkUnsafeAssigns(Loc, LHSType, RHS))
10493 // FIXME. Check for other life times.
10494 if (LT != Qualifiers::OCL_None)
10498 if (PRE->isImplicitProperty())
10500 const ObjCPropertyDecl *PD = PRE->getExplicitProperty();
10504 unsigned Attributes = PD->getPropertyAttributes();
10505 if (Attributes & ObjCPropertyDecl::OBJC_PR_assign) {
10506 // when 'assign' attribute was not explicitly specified
10507 // by user, ignore it and rely on property type itself
10508 // for lifetime info.
10509 unsigned AsWrittenAttr = PD->getPropertyAttributesAsWritten();
10510 if (!(AsWrittenAttr & ObjCPropertyDecl::OBJC_PR_assign) &&
10511 LHSType->isObjCRetainableType())
10514 while (ImplicitCastExpr *cast = dyn_cast<ImplicitCastExpr>(RHS)) {
10515 if (cast->getCastKind() == CK_ARCConsumeObject) {
10516 Diag(Loc, diag::warn_arc_retained_property_assign)
10517 << RHS->getSourceRange();
10520 RHS = cast->getSubExpr();
10523 else if (Attributes & ObjCPropertyDecl::OBJC_PR_weak) {
10524 if (checkUnsafeAssignObject(*this, Loc, Qualifiers::OCL_Weak, RHS, true))
10530 //===--- CHECK: Empty statement body (-Wempty-body) ---------------------===//
10533 bool ShouldDiagnoseEmptyStmtBody(const SourceManager &SourceMgr,
10534 SourceLocation StmtLoc,
10535 const NullStmt *Body) {
10536 // Do not warn if the body is a macro that expands to nothing, e.g:
10542 if (Body->hasLeadingEmptyMacro())
10545 // Get line numbers of statement and body.
10546 bool StmtLineInvalid;
10547 unsigned StmtLine = SourceMgr.getPresumedLineNumber(StmtLoc,
10549 if (StmtLineInvalid)
10552 bool BodyLineInvalid;
10553 unsigned BodyLine = SourceMgr.getSpellingLineNumber(Body->getSemiLoc(),
10555 if (BodyLineInvalid)
10558 // Warn if null statement and body are on the same line.
10559 if (StmtLine != BodyLine)
10564 } // end anonymous namespace
10566 void Sema::DiagnoseEmptyStmtBody(SourceLocation StmtLoc,
10569 // Since this is a syntactic check, don't emit diagnostic for template
10570 // instantiations, this just adds noise.
10571 if (CurrentInstantiationScope)
10574 // The body should be a null statement.
10575 const NullStmt *NBody = dyn_cast<NullStmt>(Body);
10579 // Do the usual checks.
10580 if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
10583 Diag(NBody->getSemiLoc(), DiagID);
10584 Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
10587 void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
10588 const Stmt *PossibleBody) {
10589 assert(!CurrentInstantiationScope); // Ensured by caller
10591 SourceLocation StmtLoc;
10594 if (const ForStmt *FS = dyn_cast<ForStmt>(S)) {
10595 StmtLoc = FS->getRParenLoc();
10596 Body = FS->getBody();
10597 DiagID = diag::warn_empty_for_body;
10598 } else if (const WhileStmt *WS = dyn_cast<WhileStmt>(S)) {
10599 StmtLoc = WS->getCond()->getSourceRange().getEnd();
10600 Body = WS->getBody();
10601 DiagID = diag::warn_empty_while_body;
10603 return; // Neither `for' nor `while'.
10605 // The body should be a null statement.
10606 const NullStmt *NBody = dyn_cast<NullStmt>(Body);
10610 // Skip expensive checks if diagnostic is disabled.
10611 if (Diags.isIgnored(DiagID, NBody->getSemiLoc()))
10614 // Do the usual checks.
10615 if (!ShouldDiagnoseEmptyStmtBody(SourceMgr, StmtLoc, NBody))
10618 // `for(...);' and `while(...);' are popular idioms, so in order to keep
10619 // noise level low, emit diagnostics only if for/while is followed by a
10620 // CompoundStmt, e.g.:
10621 // for (int i = 0; i < n; i++);
10625 // or if for/while is followed by a statement with more indentation
10626 // than for/while itself:
10627 // for (int i = 0; i < n; i++);
10629 bool ProbableTypo = isa<CompoundStmt>(PossibleBody);
10630 if (!ProbableTypo) {
10631 bool BodyColInvalid;
10632 unsigned BodyCol = SourceMgr.getPresumedColumnNumber(
10633 PossibleBody->getLocStart(),
10635 if (BodyColInvalid)
10638 bool StmtColInvalid;
10639 unsigned StmtCol = SourceMgr.getPresumedColumnNumber(
10642 if (StmtColInvalid)
10645 if (BodyCol > StmtCol)
10646 ProbableTypo = true;
10649 if (ProbableTypo) {
10650 Diag(NBody->getSemiLoc(), DiagID);
10651 Diag(NBody->getSemiLoc(), diag::note_empty_body_on_separate_line);
10655 //===--- CHECK: Warn on self move with std::move. -------------------------===//
10657 /// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
10658 void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
10659 SourceLocation OpLoc) {
10660 if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
10663 if (!ActiveTemplateInstantiations.empty())
10666 // Strip parens and casts away.
10667 LHSExpr = LHSExpr->IgnoreParenImpCasts();
10668 RHSExpr = RHSExpr->IgnoreParenImpCasts();
10670 // Check for a call expression
10671 const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
10672 if (!CE || CE->getNumArgs() != 1)
10675 // Check for a call to std::move
10676 const FunctionDecl *FD = CE->getDirectCallee();
10677 if (!FD || !FD->isInStdNamespace() || !FD->getIdentifier() ||
10678 !FD->getIdentifier()->isStr("move"))
10681 // Get argument from std::move
10682 RHSExpr = CE->getArg(0);
10684 const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
10685 const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
10687 // Two DeclRefExpr's, check that the decls are the same.
10688 if (LHSDeclRef && RHSDeclRef) {
10689 if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
10691 if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
10692 RHSDeclRef->getDecl()->getCanonicalDecl())
10695 Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
10696 << LHSExpr->getSourceRange()
10697 << RHSExpr->getSourceRange();
10701 // Member variables require a different approach to check for self moves.
10702 // MemberExpr's are the same if every nested MemberExpr refers to the same
10703 // Decl and that the base Expr's are DeclRefExpr's with the same Decl or
10704 // the base Expr's are CXXThisExpr's.
10705 const Expr *LHSBase = LHSExpr;
10706 const Expr *RHSBase = RHSExpr;
10707 const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
10708 const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
10709 if (!LHSME || !RHSME)
10712 while (LHSME && RHSME) {
10713 if (LHSME->getMemberDecl()->getCanonicalDecl() !=
10714 RHSME->getMemberDecl()->getCanonicalDecl())
10717 LHSBase = LHSME->getBase();
10718 RHSBase = RHSME->getBase();
10719 LHSME = dyn_cast<MemberExpr>(LHSBase);
10720 RHSME = dyn_cast<MemberExpr>(RHSBase);
10723 LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
10724 RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
10725 if (LHSDeclRef && RHSDeclRef) {
10726 if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
10728 if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
10729 RHSDeclRef->getDecl()->getCanonicalDecl())
10732 Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
10733 << LHSExpr->getSourceRange()
10734 << RHSExpr->getSourceRange();
10738 if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
10739 Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
10740 << LHSExpr->getSourceRange()
10741 << RHSExpr->getSourceRange();
10744 //===--- Layout compatibility ----------------------------------------------//
10748 bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2);
10750 /// \brief Check if two enumeration types are layout-compatible.
10751 bool isLayoutCompatible(ASTContext &C, EnumDecl *ED1, EnumDecl *ED2) {
10752 // C++11 [dcl.enum] p8:
10753 // Two enumeration types are layout-compatible if they have the same
10754 // underlying type.
10755 return ED1->isComplete() && ED2->isComplete() &&
10756 C.hasSameType(ED1->getIntegerType(), ED2->getIntegerType());
10759 /// \brief Check if two fields are layout-compatible.
10760 bool isLayoutCompatible(ASTContext &C, FieldDecl *Field1, FieldDecl *Field2) {
10761 if (!isLayoutCompatible(C, Field1->getType(), Field2->getType()))
10764 if (Field1->isBitField() != Field2->isBitField())
10767 if (Field1->isBitField()) {
10768 // Make sure that the bit-fields are the same length.
10769 unsigned Bits1 = Field1->getBitWidthValue(C);
10770 unsigned Bits2 = Field2->getBitWidthValue(C);
10772 if (Bits1 != Bits2)
10779 /// \brief Check if two standard-layout structs are layout-compatible.
10780 /// (C++11 [class.mem] p17)
10781 bool isLayoutCompatibleStruct(ASTContext &C,
10784 // If both records are C++ classes, check that base classes match.
10785 if (const CXXRecordDecl *D1CXX = dyn_cast<CXXRecordDecl>(RD1)) {
10786 // If one of records is a CXXRecordDecl we are in C++ mode,
10787 // thus the other one is a CXXRecordDecl, too.
10788 const CXXRecordDecl *D2CXX = cast<CXXRecordDecl>(RD2);
10789 // Check number of base classes.
10790 if (D1CXX->getNumBases() != D2CXX->getNumBases())
10793 // Check the base classes.
10794 for (CXXRecordDecl::base_class_const_iterator
10795 Base1 = D1CXX->bases_begin(),
10796 BaseEnd1 = D1CXX->bases_end(),
10797 Base2 = D2CXX->bases_begin();
10799 ++Base1, ++Base2) {
10800 if (!isLayoutCompatible(C, Base1->getType(), Base2->getType()))
10803 } else if (const CXXRecordDecl *D2CXX = dyn_cast<CXXRecordDecl>(RD2)) {
10804 // If only RD2 is a C++ class, it should have zero base classes.
10805 if (D2CXX->getNumBases() > 0)
10809 // Check the fields.
10810 RecordDecl::field_iterator Field2 = RD2->field_begin(),
10811 Field2End = RD2->field_end(),
10812 Field1 = RD1->field_begin(),
10813 Field1End = RD1->field_end();
10814 for ( ; Field1 != Field1End && Field2 != Field2End; ++Field1, ++Field2) {
10815 if (!isLayoutCompatible(C, *Field1, *Field2))
10818 if (Field1 != Field1End || Field2 != Field2End)
10824 /// \brief Check if two standard-layout unions are layout-compatible.
10825 /// (C++11 [class.mem] p18)
10826 bool isLayoutCompatibleUnion(ASTContext &C,
10829 llvm::SmallPtrSet<FieldDecl *, 8> UnmatchedFields;
10830 for (auto *Field2 : RD2->fields())
10831 UnmatchedFields.insert(Field2);
10833 for (auto *Field1 : RD1->fields()) {
10834 llvm::SmallPtrSet<FieldDecl *, 8>::iterator
10835 I = UnmatchedFields.begin(),
10836 E = UnmatchedFields.end();
10838 for ( ; I != E; ++I) {
10839 if (isLayoutCompatible(C, Field1, *I)) {
10840 bool Result = UnmatchedFields.erase(*I);
10850 return UnmatchedFields.empty();
10853 bool isLayoutCompatible(ASTContext &C, RecordDecl *RD1, RecordDecl *RD2) {
10854 if (RD1->isUnion() != RD2->isUnion())
10857 if (RD1->isUnion())
10858 return isLayoutCompatibleUnion(C, RD1, RD2);
10860 return isLayoutCompatibleStruct(C, RD1, RD2);
10863 /// \brief Check if two types are layout-compatible in C++11 sense.
10864 bool isLayoutCompatible(ASTContext &C, QualType T1, QualType T2) {
10865 if (T1.isNull() || T2.isNull())
10868 // C++11 [basic.types] p11:
10869 // If two types T1 and T2 are the same type, then T1 and T2 are
10870 // layout-compatible types.
10871 if (C.hasSameType(T1, T2))
10874 T1 = T1.getCanonicalType().getUnqualifiedType();
10875 T2 = T2.getCanonicalType().getUnqualifiedType();
10877 const Type::TypeClass TC1 = T1->getTypeClass();
10878 const Type::TypeClass TC2 = T2->getTypeClass();
10883 if (TC1 == Type::Enum) {
10884 return isLayoutCompatible(C,
10885 cast<EnumType>(T1)->getDecl(),
10886 cast<EnumType>(T2)->getDecl());
10887 } else if (TC1 == Type::Record) {
10888 if (!T1->isStandardLayoutType() || !T2->isStandardLayoutType())
10891 return isLayoutCompatible(C,
10892 cast<RecordType>(T1)->getDecl(),
10893 cast<RecordType>(T2)->getDecl());
10898 } // end anonymous namespace
10900 //===--- CHECK: pointer_with_type_tag attribute: datatypes should match ----//
10903 /// \brief Given a type tag expression find the type tag itself.
10905 /// \param TypeExpr Type tag expression, as it appears in user's code.
10907 /// \param VD Declaration of an identifier that appears in a type tag.
10909 /// \param MagicValue Type tag magic value.
10910 bool FindTypeTagExpr(const Expr *TypeExpr, const ASTContext &Ctx,
10911 const ValueDecl **VD, uint64_t *MagicValue) {
10916 TypeExpr = TypeExpr->IgnoreParenImpCasts()->IgnoreParenCasts();
10918 switch (TypeExpr->getStmtClass()) {
10919 case Stmt::UnaryOperatorClass: {
10920 const UnaryOperator *UO = cast<UnaryOperator>(TypeExpr);
10921 if (UO->getOpcode() == UO_AddrOf || UO->getOpcode() == UO_Deref) {
10922 TypeExpr = UO->getSubExpr();
10928 case Stmt::DeclRefExprClass: {
10929 const DeclRefExpr *DRE = cast<DeclRefExpr>(TypeExpr);
10930 *VD = DRE->getDecl();
10934 case Stmt::IntegerLiteralClass: {
10935 const IntegerLiteral *IL = cast<IntegerLiteral>(TypeExpr);
10936 llvm::APInt MagicValueAPInt = IL->getValue();
10937 if (MagicValueAPInt.getActiveBits() <= 64) {
10938 *MagicValue = MagicValueAPInt.getZExtValue();
10944 case Stmt::BinaryConditionalOperatorClass:
10945 case Stmt::ConditionalOperatorClass: {
10946 const AbstractConditionalOperator *ACO =
10947 cast<AbstractConditionalOperator>(TypeExpr);
10949 if (ACO->getCond()->EvaluateAsBooleanCondition(Result, Ctx)) {
10951 TypeExpr = ACO->getTrueExpr();
10953 TypeExpr = ACO->getFalseExpr();
10959 case Stmt::BinaryOperatorClass: {
10960 const BinaryOperator *BO = cast<BinaryOperator>(TypeExpr);
10961 if (BO->getOpcode() == BO_Comma) {
10962 TypeExpr = BO->getRHS();
10974 /// \brief Retrieve the C type corresponding to type tag TypeExpr.
10976 /// \param TypeExpr Expression that specifies a type tag.
10978 /// \param MagicValues Registered magic values.
10980 /// \param FoundWrongKind Set to true if a type tag was found, but of a wrong
10983 /// \param TypeInfo Information about the corresponding C type.
10985 /// \returns true if the corresponding C type was found.
10986 bool GetMatchingCType(
10987 const IdentifierInfo *ArgumentKind,
10988 const Expr *TypeExpr, const ASTContext &Ctx,
10989 const llvm::DenseMap<Sema::TypeTagMagicValue,
10990 Sema::TypeTagData> *MagicValues,
10991 bool &FoundWrongKind,
10992 Sema::TypeTagData &TypeInfo) {
10993 FoundWrongKind = false;
10995 // Variable declaration that has type_tag_for_datatype attribute.
10996 const ValueDecl *VD = nullptr;
10998 uint64_t MagicValue;
11000 if (!FindTypeTagExpr(TypeExpr, Ctx, &VD, &MagicValue))
11004 if (TypeTagForDatatypeAttr *I = VD->getAttr<TypeTagForDatatypeAttr>()) {
11005 if (I->getArgumentKind() != ArgumentKind) {
11006 FoundWrongKind = true;
11009 TypeInfo.Type = I->getMatchingCType();
11010 TypeInfo.LayoutCompatible = I->getLayoutCompatible();
11011 TypeInfo.MustBeNull = I->getMustBeNull();
11020 llvm::DenseMap<Sema::TypeTagMagicValue,
11021 Sema::TypeTagData>::const_iterator I =
11022 MagicValues->find(std::make_pair(ArgumentKind, MagicValue));
11023 if (I == MagicValues->end())
11026 TypeInfo = I->second;
11029 } // end anonymous namespace
11031 void Sema::RegisterTypeTagForDatatype(const IdentifierInfo *ArgumentKind,
11032 uint64_t MagicValue, QualType Type,
11033 bool LayoutCompatible,
11035 if (!TypeTagForDatatypeMagicValues)
11036 TypeTagForDatatypeMagicValues.reset(
11037 new llvm::DenseMap<TypeTagMagicValue, TypeTagData>);
11039 TypeTagMagicValue Magic(ArgumentKind, MagicValue);
11040 (*TypeTagForDatatypeMagicValues)[Magic] =
11041 TypeTagData(Type, LayoutCompatible, MustBeNull);
11045 bool IsSameCharType(QualType T1, QualType T2) {
11046 const BuiltinType *BT1 = T1->getAs<BuiltinType>();
11050 const BuiltinType *BT2 = T2->getAs<BuiltinType>();
11054 BuiltinType::Kind T1Kind = BT1->getKind();
11055 BuiltinType::Kind T2Kind = BT2->getKind();
11057 return (T1Kind == BuiltinType::SChar && T2Kind == BuiltinType::Char_S) ||
11058 (T1Kind == BuiltinType::UChar && T2Kind == BuiltinType::Char_U) ||
11059 (T1Kind == BuiltinType::Char_U && T2Kind == BuiltinType::UChar) ||
11060 (T1Kind == BuiltinType::Char_S && T2Kind == BuiltinType::SChar);
11062 } // end anonymous namespace
11064 void Sema::CheckArgumentWithTypeTag(const ArgumentWithTypeTagAttr *Attr,
11065 const Expr * const *ExprArgs) {
11066 const IdentifierInfo *ArgumentKind = Attr->getArgumentKind();
11067 bool IsPointerAttr = Attr->getIsPointer();
11069 const Expr *TypeTagExpr = ExprArgs[Attr->getTypeTagIdx()];
11070 bool FoundWrongKind;
11071 TypeTagData TypeInfo;
11072 if (!GetMatchingCType(ArgumentKind, TypeTagExpr, Context,
11073 TypeTagForDatatypeMagicValues.get(),
11074 FoundWrongKind, TypeInfo)) {
11075 if (FoundWrongKind)
11076 Diag(TypeTagExpr->getExprLoc(),
11077 diag::warn_type_tag_for_datatype_wrong_kind)
11078 << TypeTagExpr->getSourceRange();
11082 const Expr *ArgumentExpr = ExprArgs[Attr->getArgumentIdx()];
11083 if (IsPointerAttr) {
11084 // Skip implicit cast of pointer to `void *' (as a function argument).
11085 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgumentExpr))
11086 if (ICE->getType()->isVoidPointerType() &&
11087 ICE->getCastKind() == CK_BitCast)
11088 ArgumentExpr = ICE->getSubExpr();
11090 QualType ArgumentType = ArgumentExpr->getType();
11092 // Passing a `void*' pointer shouldn't trigger a warning.
11093 if (IsPointerAttr && ArgumentType->isVoidPointerType())
11096 if (TypeInfo.MustBeNull) {
11097 // Type tag with matching void type requires a null pointer.
11098 if (!ArgumentExpr->isNullPointerConstant(Context,
11099 Expr::NPC_ValueDependentIsNotNull)) {
11100 Diag(ArgumentExpr->getExprLoc(),
11101 diag::warn_type_safety_null_pointer_required)
11102 << ArgumentKind->getName()
11103 << ArgumentExpr->getSourceRange()
11104 << TypeTagExpr->getSourceRange();
11109 QualType RequiredType = TypeInfo.Type;
11111 RequiredType = Context.getPointerType(RequiredType);
11113 bool mismatch = false;
11114 if (!TypeInfo.LayoutCompatible) {
11115 mismatch = !Context.hasSameType(ArgumentType, RequiredType);
11117 // C++11 [basic.fundamental] p1:
11118 // Plain char, signed char, and unsigned char are three distinct types.
11120 // But we treat plain `char' as equivalent to `signed char' or `unsigned
11121 // char' depending on the current char signedness mode.
11123 if ((IsPointerAttr && IsSameCharType(ArgumentType->getPointeeType(),
11124 RequiredType->getPointeeType())) ||
11125 (!IsPointerAttr && IsSameCharType(ArgumentType, RequiredType)))
11129 mismatch = !isLayoutCompatible(Context,
11130 ArgumentType->getPointeeType(),
11131 RequiredType->getPointeeType());
11133 mismatch = !isLayoutCompatible(Context, ArgumentType, RequiredType);
11136 Diag(ArgumentExpr->getExprLoc(), diag::warn_type_safety_type_mismatch)
11137 << ArgumentType << ArgumentKind
11138 << TypeInfo.LayoutCompatible << RequiredType
11139 << ArgumentExpr->getSourceRange()
11140 << TypeTagExpr->getSourceRange();