1 //===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===//
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 coordinates the per-function state used while generating code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
15 #include "CodeGenModule.h"
16 #include "CGCUDARuntime.h"
18 #include "CGDebugInfo.h"
19 #include "clang/Basic/TargetInfo.h"
20 #include "clang/AST/ASTContext.h"
21 #include "clang/AST/Decl.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/StmtCXX.h"
24 #include "clang/Frontend/CodeGenOptions.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/MDBuilder.h"
27 #include "llvm/DataLayout.h"
28 using namespace clang;
29 using namespace CodeGen;
31 CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext)
32 : CodeGenTypeCache(cgm), CGM(cgm),
33 Target(CGM.getContext().getTargetInfo()),
34 Builder(cgm.getModule().getContext()),
35 SanitizePerformTypeCheck(CGM.getLangOpts().SanitizeNull |
36 CGM.getLangOpts().SanitizeAlignment |
37 CGM.getLangOpts().SanitizeObjectSize |
38 CGM.getLangOpts().SanitizeVptr),
39 AutoreleaseResult(false), BlockInfo(0), BlockPointer(0),
40 LambdaThisCaptureField(0), NormalCleanupDest(0), NextCleanupDestIndex(1),
41 FirstBlockInfo(0), EHResumeBlock(0), ExceptionSlot(0), EHSelectorSlot(0),
42 DebugInfo(0), DisableDebugInfo(false), DidCallStackSave(false),
43 IndirectBranch(0), SwitchInsn(0), CaseRangeBlock(0), UnreachableBlock(0),
44 CXXABIThisDecl(0), CXXABIThisValue(0), CXXThisValue(0), CXXVTTDecl(0),
45 CXXVTTValue(0), OutermostConditional(0), TerminateLandingPad(0),
46 TerminateHandler(0), TrapBB(0) {
47 if (!suppressNewContext)
48 CGM.getCXXABI().getMangleContext().startNewFunction();
51 CodeGenFunction::~CodeGenFunction() {
52 // If there are any unclaimed block infos, go ahead and destroy them
53 // now. This can happen if IR-gen gets clever and skips evaluating
56 destroyBlockInfos(FirstBlockInfo);
60 llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) {
61 return CGM.getTypes().ConvertTypeForMem(T);
64 llvm::Type *CodeGenFunction::ConvertType(QualType T) {
65 return CGM.getTypes().ConvertType(T);
68 bool CodeGenFunction::hasAggregateLLVMType(QualType type) {
69 switch (type.getCanonicalType()->getTypeClass()) {
70 #define TYPE(name, parent)
71 #define ABSTRACT_TYPE(name, parent)
72 #define NON_CANONICAL_TYPE(name, parent) case Type::name:
73 #define DEPENDENT_TYPE(name, parent) case Type::name:
74 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name:
75 #include "clang/AST/TypeNodes.def"
76 llvm_unreachable("non-canonical or dependent type in IR-generation");
80 case Type::BlockPointer:
81 case Type::LValueReference:
82 case Type::RValueReference:
83 case Type::MemberPointer:
86 case Type::FunctionProto:
87 case Type::FunctionNoProto:
89 case Type::ObjCObjectPointer:
92 // Complexes, arrays, records, and Objective-C objects.
94 case Type::ConstantArray:
95 case Type::IncompleteArray:
96 case Type::VariableArray:
98 case Type::ObjCObject:
99 case Type::ObjCInterface:
102 // In IRGen, atomic types are just the underlying type
104 return hasAggregateLLVMType(type->getAs<AtomicType>()->getValueType());
106 llvm_unreachable("unknown type kind!");
109 void CodeGenFunction::EmitReturnBlock() {
110 // For cleanliness, we try to avoid emitting the return block for
112 llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
115 assert(!CurBB->getTerminator() && "Unexpected terminated block.");
117 // We have a valid insert point, reuse it if it is empty or there are no
118 // explicit jumps to the return block.
119 if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) {
120 ReturnBlock.getBlock()->replaceAllUsesWith(CurBB);
121 delete ReturnBlock.getBlock();
123 EmitBlock(ReturnBlock.getBlock());
127 // Otherwise, if the return block is the target of a single direct
128 // branch then we can just put the code in that block instead. This
129 // cleans up functions which started with a unified return block.
130 if (ReturnBlock.getBlock()->hasOneUse()) {
131 llvm::BranchInst *BI =
132 dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->use_begin());
133 if (BI && BI->isUnconditional() &&
134 BI->getSuccessor(0) == ReturnBlock.getBlock()) {
135 // Reset insertion point, including debug location, and delete the branch.
136 Builder.SetCurrentDebugLocation(BI->getDebugLoc());
137 Builder.SetInsertPoint(BI->getParent());
138 BI->eraseFromParent();
139 delete ReturnBlock.getBlock();
144 // FIXME: We are at an unreachable point, there is no reason to emit the block
145 // unless it has uses. However, we still need a place to put the debug
146 // region.end for now.
148 EmitBlock(ReturnBlock.getBlock());
151 static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) {
153 if (!BB->use_empty())
154 return CGF.CurFn->getBasicBlockList().push_back(BB);
158 void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
159 assert(BreakContinueStack.empty() &&
160 "mismatched push/pop in break/continue stack!");
162 // Pop any cleanups that might have been associated with the
163 // parameters. Do this in whatever block we're currently in; it's
164 // important to do this before we enter the return block or return
165 // edges will be *really* confused.
166 if (EHStack.stable_begin() != PrologueCleanupDepth)
167 PopCleanupBlocks(PrologueCleanupDepth);
169 // Emit function epilog (to return).
172 if (ShouldInstrumentFunction())
173 EmitFunctionInstrumentation("__cyg_profile_func_exit");
175 // Emit debug descriptor for function end.
176 if (CGDebugInfo *DI = getDebugInfo()) {
177 DI->setLocation(EndLoc);
178 DI->EmitFunctionEnd(Builder);
181 EmitFunctionEpilog(*CurFnInfo);
182 EmitEndEHSpec(CurCodeDecl);
184 assert(EHStack.empty() &&
185 "did not remove all scopes from cleanup stack!");
187 // If someone did an indirect goto, emit the indirect goto block at the end of
189 if (IndirectBranch) {
190 EmitBlock(IndirectBranch->getParent());
191 Builder.ClearInsertionPoint();
194 // Remove the AllocaInsertPt instruction, which is just a convenience for us.
195 llvm::Instruction *Ptr = AllocaInsertPt;
197 Ptr->eraseFromParent();
199 // If someone took the address of a label but never did an indirect goto, we
200 // made a zero entry PHI node, which is illegal, zap it now.
201 if (IndirectBranch) {
202 llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress());
203 if (PN->getNumIncomingValues() == 0) {
204 PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType()));
205 PN->eraseFromParent();
209 EmitIfUsed(*this, EHResumeBlock);
210 EmitIfUsed(*this, TerminateLandingPad);
211 EmitIfUsed(*this, TerminateHandler);
212 EmitIfUsed(*this, UnreachableBlock);
214 if (CGM.getCodeGenOpts().EmitDeclMetadata)
218 /// ShouldInstrumentFunction - Return true if the current function should be
219 /// instrumented with __cyg_profile_func_* calls
220 bool CodeGenFunction::ShouldInstrumentFunction() {
221 if (!CGM.getCodeGenOpts().InstrumentFunctions)
223 if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>())
228 /// EmitFunctionInstrumentation - Emit LLVM code to call the specified
229 /// instrumentation function with the current function and the call site, if
230 /// function instrumentation is enabled.
231 void CodeGenFunction::EmitFunctionInstrumentation(const char *Fn) {
232 // void __cyg_profile_func_{enter,exit} (void *this_fn, void *call_site);
233 llvm::PointerType *PointerTy = Int8PtrTy;
234 llvm::Type *ProfileFuncArgs[] = { PointerTy, PointerTy };
235 llvm::FunctionType *FunctionTy =
236 llvm::FunctionType::get(VoidTy, ProfileFuncArgs, false);
238 llvm::Constant *F = CGM.CreateRuntimeFunction(FunctionTy, Fn);
239 llvm::CallInst *CallSite = Builder.CreateCall(
240 CGM.getIntrinsic(llvm::Intrinsic::returnaddress),
241 llvm::ConstantInt::get(Int32Ty, 0),
244 Builder.CreateCall2(F,
245 llvm::ConstantExpr::getBitCast(CurFn, PointerTy),
249 void CodeGenFunction::EmitMCountInstrumentation() {
250 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
252 llvm::Constant *MCountFn = CGM.CreateRuntimeFunction(FTy,
253 Target.getMCountName());
254 Builder.CreateCall(MCountFn);
257 // OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
258 // information in the program executable. The argument information stored
259 // includes the argument name, its type, the address and access qualifiers used.
260 // FIXME: Add type, address, and access qualifiers.
261 static void GenOpenCLArgMetadata(const FunctionDecl *FD, llvm::Function *Fn,
262 CodeGenModule &CGM,llvm::LLVMContext &Context,
263 llvm::SmallVector <llvm::Value*, 5> &kernelMDArgs) {
265 // Create MDNodes that represents the kernel arg metadata.
266 // Each MDNode is a list in the form of "key", N number of values which is
267 // the same number of values as their are kernel arguments.
269 // MDNode for the kernel argument names.
270 SmallVector<llvm::Value*, 8> argNames;
271 argNames.push_back(llvm::MDString::get(Context, "kernel_arg_name"));
273 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
274 const ParmVarDecl *parm = FD->getParamDecl(i);
276 // Get argument name.
277 argNames.push_back(llvm::MDString::get(Context, parm->getName()));
280 // Add MDNode to the list of all metadata.
281 kernelMDArgs.push_back(llvm::MDNode::get(Context, argNames));
284 void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD,
287 if (!FD->hasAttr<OpenCLKernelAttr>())
290 llvm::LLVMContext &Context = getLLVMContext();
292 llvm::SmallVector <llvm::Value*, 5> kernelMDArgs;
293 kernelMDArgs.push_back(Fn);
295 if (CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
296 GenOpenCLArgMetadata(FD, Fn, CGM, Context, kernelMDArgs);
298 if (FD->hasAttr<WorkGroupSizeHintAttr>()) {
299 llvm::SmallVector <llvm::Value*, 5> attrMDArgs;
300 attrMDArgs.push_back(llvm::MDString::get(Context, "work_group_size_hint"));
301 WorkGroupSizeHintAttr *attr = FD->getAttr<WorkGroupSizeHintAttr>();
302 llvm::Type *iTy = llvm::IntegerType::get(Context, 32);
303 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
304 llvm::APInt(32, (uint64_t)attr->getXDim())));
305 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
306 llvm::APInt(32, (uint64_t)attr->getYDim())));
307 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
308 llvm::APInt(32, (uint64_t)attr->getZDim())));
309 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
312 if (FD->hasAttr<ReqdWorkGroupSizeAttr>()) {
313 llvm::SmallVector <llvm::Value*, 5> attrMDArgs;
314 attrMDArgs.push_back(llvm::MDString::get(Context, "reqd_work_group_size"));
315 ReqdWorkGroupSizeAttr *attr = FD->getAttr<ReqdWorkGroupSizeAttr>();
316 llvm::Type *iTy = llvm::IntegerType::get(Context, 32);
317 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
318 llvm::APInt(32, (uint64_t)attr->getXDim())));
319 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
320 llvm::APInt(32, (uint64_t)attr->getYDim())));
321 attrMDArgs.push_back(llvm::ConstantInt::get(iTy,
322 llvm::APInt(32, (uint64_t)attr->getZDim())));
323 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
326 llvm::MDNode *kernelMDNode = llvm::MDNode::get(Context, kernelMDArgs);
327 llvm::NamedMDNode *OpenCLKernelMetadata =
328 CGM.getModule().getOrInsertNamedMetadata("opencl.kernels");
329 OpenCLKernelMetadata->addOperand(kernelMDNode);
332 void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
334 const CGFunctionInfo &FnInfo,
335 const FunctionArgList &Args,
336 SourceLocation StartLoc) {
337 const Decl *D = GD.getDecl();
339 DidCallStackSave = false;
340 CurCodeDecl = CurFuncDecl = D;
344 assert(CurFn->isDeclaration() && "Function already has body?");
346 // Pass inline keyword to optimizer if it appears explicitly on any
348 if (!CGM.getCodeGenOpts().NoInline)
349 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
350 for (FunctionDecl::redecl_iterator RI = FD->redecls_begin(),
351 RE = FD->redecls_end(); RI != RE; ++RI)
352 if (RI->isInlineSpecified()) {
353 Fn->addFnAttr(llvm::Attributes::InlineHint);
357 if (getLangOpts().OpenCL) {
358 // Add metadata for a kernel function.
359 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
360 EmitOpenCLKernelMetadata(FD, Fn);
363 llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn);
365 // Create a marker to make it easy to insert allocas into the entryblock
366 // later. Don't create this with the builder, because we don't want it
368 llvm::Value *Undef = llvm::UndefValue::get(Int32Ty);
369 AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "", EntryBB);
370 if (Builder.isNamePreserving())
371 AllocaInsertPt->setName("allocapt");
373 ReturnBlock = getJumpDestInCurrentScope("return");
375 Builder.SetInsertPoint(EntryBB);
377 // Emit subprogram debug descriptor.
378 if (CGDebugInfo *DI = getDebugInfo()) {
379 unsigned NumArgs = 0;
380 QualType *ArgsArray = new QualType[Args.size()];
381 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
383 ArgsArray[NumArgs++] = (*i)->getType();
387 getContext().getFunctionType(RetTy, ArgsArray, NumArgs,
388 FunctionProtoType::ExtProtoInfo());
392 DI->setLocation(StartLoc);
393 DI->EmitFunctionStart(GD, FnType, CurFn, Builder);
396 if (ShouldInstrumentFunction())
397 EmitFunctionInstrumentation("__cyg_profile_func_enter");
399 if (CGM.getCodeGenOpts().InstrumentForProfiling)
400 EmitMCountInstrumentation();
402 if (RetTy->isVoidType()) {
403 // Void type; nothing to return.
405 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect &&
406 hasAggregateLLVMType(CurFnInfo->getReturnType())) {
407 // Indirect aggregate return; emit returned value directly into sret slot.
408 // This reduces code size, and affects correctness in C++.
409 ReturnValue = CurFn->arg_begin();
411 ReturnValue = CreateIRTemp(RetTy, "retval");
413 // Tell the epilog emitter to autorelease the result. We do this
414 // now so that various specialized functions can suppress it
415 // during their IR-generation.
416 if (getLangOpts().ObjCAutoRefCount &&
417 !CurFnInfo->isReturnsRetained() &&
418 RetTy->isObjCRetainableType())
419 AutoreleaseResult = true;
422 EmitStartEHSpec(CurCodeDecl);
424 PrologueCleanupDepth = EHStack.stable_begin();
425 EmitFunctionProlog(*CurFnInfo, CurFn, Args);
427 if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
428 CGM.getCXXABI().EmitInstanceFunctionProlog(*this);
429 const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
430 if (MD->getParent()->isLambda() &&
431 MD->getOverloadedOperator() == OO_Call) {
432 // We're in a lambda; figure out the captures.
433 MD->getParent()->getCaptureFields(LambdaCaptureFields,
434 LambdaThisCaptureField);
435 if (LambdaThisCaptureField) {
436 // If this lambda captures this, load it.
437 QualType LambdaTagType =
438 getContext().getTagDeclType(LambdaThisCaptureField->getParent());
439 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue,
441 LValue ThisLValue = EmitLValueForField(LambdaLV,
442 LambdaThisCaptureField);
443 CXXThisValue = EmitLoadOfLValue(ThisLValue).getScalarVal();
446 // Not in a lambda; just use 'this' from the method.
447 // FIXME: Should we generate a new load for each use of 'this'? The
448 // fast register allocator would be happier...
449 CXXThisValue = CXXABIThisValue;
453 // If any of the arguments have a variably modified type, make sure to
454 // emit the type size.
455 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
457 QualType Ty = (*i)->getType();
459 if (Ty->isVariablyModifiedType())
460 EmitVariablyModifiedType(Ty);
462 // Emit a location at the end of the prologue.
463 if (CGDebugInfo *DI = getDebugInfo())
464 DI->EmitLocation(Builder, StartLoc);
467 void CodeGenFunction::EmitFunctionBody(FunctionArgList &Args) {
468 const FunctionDecl *FD = cast<FunctionDecl>(CurGD.getDecl());
469 assert(FD->getBody());
470 EmitStmt(FD->getBody());
473 /// Tries to mark the given function nounwind based on the
474 /// non-existence of any throwing calls within it. We believe this is
475 /// lightweight enough to do at -O0.
476 static void TryMarkNoThrow(llvm::Function *F) {
477 // LLVM treats 'nounwind' on a function as part of the type, so we
478 // can't do this on functions that can be overwritten.
479 if (F->mayBeOverridden()) return;
481 for (llvm::Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
482 for (llvm::BasicBlock::iterator
483 BI = FI->begin(), BE = FI->end(); BI != BE; ++BI)
484 if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(&*BI)) {
485 if (!Call->doesNotThrow())
487 } else if (isa<llvm::ResumeInst>(&*BI)) {
490 F->setDoesNotThrow();
493 void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
494 const CGFunctionInfo &FnInfo) {
495 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
497 // Check if we should generate debug info for this function.
498 if (!FD->hasAttr<NoDebugAttr>())
499 maybeInitializeDebugInfo();
501 FunctionArgList Args;
502 QualType ResTy = FD->getResultType();
505 if (isa<CXXMethodDecl>(FD) && cast<CXXMethodDecl>(FD)->isInstance())
506 CGM.getCXXABI().BuildInstanceFunctionParams(*this, ResTy, Args);
508 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i)
509 Args.push_back(FD->getParamDecl(i));
511 SourceRange BodyRange;
512 if (Stmt *Body = FD->getBody()) BodyRange = Body->getSourceRange();
514 // Emit the standard function prologue.
515 StartFunction(GD, ResTy, Fn, FnInfo, Args, BodyRange.getBegin());
517 // Generate the body of the function.
518 if (isa<CXXDestructorDecl>(FD))
519 EmitDestructorBody(Args);
520 else if (isa<CXXConstructorDecl>(FD))
521 EmitConstructorBody(Args);
522 else if (getLangOpts().CUDA &&
523 !CGM.getCodeGenOpts().CUDAIsDevice &&
524 FD->hasAttr<CUDAGlobalAttr>())
525 CGM.getCUDARuntime().EmitDeviceStubBody(*this, Args);
526 else if (isa<CXXConversionDecl>(FD) &&
527 cast<CXXConversionDecl>(FD)->isLambdaToBlockPointerConversion()) {
528 // The lambda conversion to block pointer is special; the semantics can't be
529 // expressed in the AST, so IRGen needs to special-case it.
530 EmitLambdaToBlockPointerBody(Args);
531 } else if (isa<CXXMethodDecl>(FD) &&
532 cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) {
533 // The lambda "__invoke" function is special, because it forwards or
534 // clones the body of the function call operator (but is actually static).
535 EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD));
538 EmitFunctionBody(Args);
540 // C++11 [stmt.return]p2:
541 // Flowing off the end of a function [...] results in undefined behavior in
542 // a value-returning function.
544 // If the '}' that terminates a function is reached, and the value of the
545 // function call is used by the caller, the behavior is undefined.
546 if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() &&
547 !FD->getResultType()->isVoidType() && Builder.GetInsertBlock()) {
548 if (getLangOpts().SanitizeReturn)
549 EmitCheck(Builder.getFalse(), "missing_return",
550 EmitCheckSourceLocation(FD->getLocation()),
551 llvm::ArrayRef<llvm::Value*>());
552 else if (CGM.getCodeGenOpts().OptimizationLevel == 0)
553 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::trap));
554 Builder.CreateUnreachable();
555 Builder.ClearInsertionPoint();
558 // Emit the standard function epilogue.
559 FinishFunction(BodyRange.getEnd());
561 // If we haven't marked the function nothrow through other means, do
562 // a quick pass now to see if we can.
563 if (!CurFn->doesNotThrow())
564 TryMarkNoThrow(CurFn);
567 /// ContainsLabel - Return true if the statement contains a label in it. If
568 /// this statement is not executed normally, it not containing a label means
569 /// that we can just remove the code.
570 bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) {
571 // Null statement, not a label!
572 if (S == 0) return false;
574 // If this is a label, we have to emit the code, consider something like:
575 // if (0) { ... foo: bar(); } goto foo;
577 // TODO: If anyone cared, we could track __label__'s, since we know that you
578 // can't jump to one from outside their declared region.
579 if (isa<LabelStmt>(S))
582 // If this is a case/default statement, and we haven't seen a switch, we have
584 if (isa<SwitchCase>(S) && !IgnoreCaseStmts)
587 // If this is a switch statement, we want to ignore cases below it.
588 if (isa<SwitchStmt>(S))
589 IgnoreCaseStmts = true;
591 // Scan subexpressions for verboten labels.
592 for (Stmt::const_child_range I = S->children(); I; ++I)
593 if (ContainsLabel(*I, IgnoreCaseStmts))
599 /// containsBreak - Return true if the statement contains a break out of it.
600 /// If the statement (recursively) contains a switch or loop with a break
601 /// inside of it, this is fine.
602 bool CodeGenFunction::containsBreak(const Stmt *S) {
603 // Null statement, not a label!
604 if (S == 0) return false;
606 // If this is a switch or loop that defines its own break scope, then we can
607 // include it and anything inside of it.
608 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) ||
612 if (isa<BreakStmt>(S))
615 // Scan subexpressions for verboten breaks.
616 for (Stmt::const_child_range I = S->children(); I; ++I)
617 if (containsBreak(*I))
624 /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
625 /// to a constant, or if it does but contains a label, return false. If it
626 /// constant folds return true and set the boolean result in Result.
627 bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond,
629 llvm::APSInt ResultInt;
630 if (!ConstantFoldsToSimpleInteger(Cond, ResultInt))
633 ResultBool = ResultInt.getBoolValue();
637 /// ConstantFoldsToSimpleInteger - If the specified expression does not fold
638 /// to a constant, or if it does but contains a label, return false. If it
639 /// constant folds return true and set the folded value.
640 bool CodeGenFunction::
641 ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &ResultInt) {
642 // FIXME: Rename and handle conversion of other evaluatable things
645 if (!Cond->EvaluateAsInt(Int, getContext()))
646 return false; // Not foldable, not integer or not fully evaluatable.
648 if (CodeGenFunction::ContainsLabel(Cond))
649 return false; // Contains a label.
657 /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if
658 /// statement) to the specified blocks. Based on the condition, this might try
659 /// to simplify the codegen of the conditional based on the branch.
661 void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond,
662 llvm::BasicBlock *TrueBlock,
663 llvm::BasicBlock *FalseBlock) {
664 Cond = Cond->IgnoreParens();
666 if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) {
667 // Handle X && Y in a condition.
668 if (CondBOp->getOpcode() == BO_LAnd) {
669 // If we have "1 && X", simplify the code. "0 && X" would have constant
670 // folded if the case was simple enough.
671 bool ConstantBool = false;
672 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
674 // br(1 && X) -> br(X).
675 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock);
678 // If we have "X && 1", simplify the code to use an uncond branch.
679 // "X && 0" would have been constant folded to 0.
680 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
682 // br(X && 1) -> br(X).
683 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock);
686 // Emit the LHS as a conditional. If the LHS conditional is false, we
687 // want to jump to the FalseBlock.
688 llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true");
690 ConditionalEvaluation eval(*this);
691 EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock);
694 // Any temporaries created here are conditional.
696 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock);
702 if (CondBOp->getOpcode() == BO_LOr) {
703 // If we have "0 || X", simplify the code. "1 || X" would have constant
704 // folded if the case was simple enough.
705 bool ConstantBool = false;
706 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
708 // br(0 || X) -> br(X).
709 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock);
712 // If we have "X || 0", simplify the code to use an uncond branch.
713 // "X || 1" would have been constant folded to 1.
714 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
716 // br(X || 0) -> br(X).
717 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock);
720 // Emit the LHS as a conditional. If the LHS conditional is true, we
721 // want to jump to the TrueBlock.
722 llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false");
724 ConditionalEvaluation eval(*this);
725 EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse);
728 // Any temporaries created here are conditional.
730 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock);
737 if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) {
738 // br(!x, t, f) -> br(x, f, t)
739 if (CondUOp->getOpcode() == UO_LNot)
740 return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock);
743 if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) {
744 // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f))
745 llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true");
746 llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false");
748 ConditionalEvaluation cond(*this);
749 EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock);
753 EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock);
758 EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock);
764 // Emit the code with the fully general case.
765 llvm::Value *CondV = EvaluateExprAsBool(Cond);
766 Builder.CreateCondBr(CondV, TrueBlock, FalseBlock);
769 /// ErrorUnsupported - Print out an error that codegen doesn't support the
770 /// specified stmt yet.
771 void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type,
773 CGM.ErrorUnsupported(S, Type, OmitOnError);
776 /// emitNonZeroVLAInit - Emit the "zero" initialization of a
777 /// variable-length array whose elements have a non-zero bit-pattern.
779 /// \param baseType the inner-most element type of the array
780 /// \param src - a char* pointing to the bit-pattern for a single
781 /// base element of the array
782 /// \param sizeInChars - the total size of the VLA, in chars
783 static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType,
784 llvm::Value *dest, llvm::Value *src,
785 llvm::Value *sizeInChars) {
786 std::pair<CharUnits,CharUnits> baseSizeAndAlign
787 = CGF.getContext().getTypeInfoInChars(baseType);
789 CGBuilderTy &Builder = CGF.Builder;
791 llvm::Value *baseSizeInChars
792 = llvm::ConstantInt::get(CGF.IntPtrTy, baseSizeAndAlign.first.getQuantity());
794 llvm::Type *i8p = Builder.getInt8PtrTy();
796 llvm::Value *begin = Builder.CreateBitCast(dest, i8p, "vla.begin");
797 llvm::Value *end = Builder.CreateInBoundsGEP(dest, sizeInChars, "vla.end");
799 llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock();
800 llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop");
801 llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont");
803 // Make a loop over the VLA. C99 guarantees that the VLA element
804 // count must be nonzero.
805 CGF.EmitBlock(loopBB);
807 llvm::PHINode *cur = Builder.CreatePHI(i8p, 2, "vla.cur");
808 cur->addIncoming(begin, originBB);
810 // memcpy the individual element bit-pattern.
811 Builder.CreateMemCpy(cur, src, baseSizeInChars,
812 baseSizeAndAlign.second.getQuantity(),
815 // Go to the next element.
816 llvm::Value *next = Builder.CreateConstInBoundsGEP1_32(cur, 1, "vla.next");
818 // Leave if that's the end of the VLA.
819 llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone");
820 Builder.CreateCondBr(done, contBB, loopBB);
821 cur->addIncoming(next, loopBB);
823 CGF.EmitBlock(contBB);
827 CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
828 // Ignore empty classes in C++.
829 if (getLangOpts().CPlusPlus) {
830 if (const RecordType *RT = Ty->getAs<RecordType>()) {
831 if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty())
836 // Cast the dest ptr to the appropriate i8 pointer type.
838 cast<llvm::PointerType>(DestPtr->getType())->getAddressSpace();
839 llvm::Type *BP = Builder.getInt8PtrTy(DestAS);
840 if (DestPtr->getType() != BP)
841 DestPtr = Builder.CreateBitCast(DestPtr, BP);
843 // Get size and alignment info for this aggregate.
844 std::pair<CharUnits, CharUnits> TypeInfo =
845 getContext().getTypeInfoInChars(Ty);
846 CharUnits Size = TypeInfo.first;
847 CharUnits Align = TypeInfo.second;
849 llvm::Value *SizeVal;
850 const VariableArrayType *vla;
852 // Don't bother emitting a zero-byte memset.
854 // But note that getTypeInfo returns 0 for a VLA.
855 if (const VariableArrayType *vlaType =
856 dyn_cast_or_null<VariableArrayType>(
857 getContext().getAsArrayType(Ty))) {
859 llvm::Value *numElts;
860 llvm::tie(numElts, eltType) = getVLASize(vlaType);
863 CharUnits eltSize = getContext().getTypeSizeInChars(eltType);
864 if (!eltSize.isOne())
865 SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize));
871 SizeVal = CGM.getSize(Size);
875 // If the type contains a pointer to data member we can't memset it to zero.
876 // Instead, create a null constant and copy it to the destination.
877 // TODO: there are other patterns besides zero that we can usefully memset,
878 // like -1, which happens to be the pattern used by member-pointers.
879 if (!CGM.getTypes().isZeroInitializable(Ty)) {
880 // For a VLA, emit a single element, then splat that over the VLA.
881 if (vla) Ty = getContext().getBaseElementType(vla);
883 llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty);
885 llvm::GlobalVariable *NullVariable =
886 new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(),
888 llvm::GlobalVariable::PrivateLinkage,
889 NullConstant, Twine());
890 llvm::Value *SrcPtr =
891 Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy());
893 if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal);
895 // Get and call the appropriate llvm.memcpy overload.
896 Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, Align.getQuantity(), false);
900 // Otherwise, just memset the whole thing to zero. This is legal
901 // because in LLVM, all default initializers (other than the ones we just
902 // handled above) are guaranteed to have a bit pattern of all zeros.
903 Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal,
904 Align.getQuantity(), false);
907 llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) {
908 // Make sure that there is a block for the indirect goto.
909 if (IndirectBranch == 0)
910 GetIndirectGotoBlock();
912 llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock();
914 // Make sure the indirect branch includes all of the address-taken blocks.
915 IndirectBranch->addDestination(BB);
916 return llvm::BlockAddress::get(CurFn, BB);
919 llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() {
920 // If we already made the indirect branch for indirect goto, return its block.
921 if (IndirectBranch) return IndirectBranch->getParent();
923 CGBuilderTy TmpBuilder(createBasicBlock("indirectgoto"));
925 // Create the PHI node that indirect gotos will add entries to.
926 llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0,
927 "indirect.goto.dest");
929 // Create the indirect branch instruction.
930 IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal);
931 return IndirectBranch->getParent();
934 /// Computes the length of an array in elements, as well as the base
935 /// element type and a properly-typed first element pointer.
936 llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType,
938 llvm::Value *&addr) {
939 const ArrayType *arrayType = origArrayType;
941 // If it's a VLA, we have to load the stored size. Note that
942 // this is the size of the VLA in bytes, not its size in elements.
943 llvm::Value *numVLAElements = 0;
944 if (isa<VariableArrayType>(arrayType)) {
945 numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).first;
947 // Walk into all VLAs. This doesn't require changes to addr,
948 // which has type T* where T is the first non-VLA element type.
950 QualType elementType = arrayType->getElementType();
951 arrayType = getContext().getAsArrayType(elementType);
953 // If we only have VLA components, 'addr' requires no adjustment.
955 baseType = elementType;
956 return numVLAElements;
958 } while (isa<VariableArrayType>(arrayType));
960 // We get out here only if we find a constant array type
964 // We have some number of constant-length arrays, so addr should
965 // have LLVM type [M x [N x [...]]]*. Build a GEP that walks
966 // down to the first element of addr.
967 SmallVector<llvm::Value*, 8> gepIndices;
969 // GEP down to the array type.
970 llvm::ConstantInt *zero = Builder.getInt32(0);
971 gepIndices.push_back(zero);
973 uint64_t countFromCLAs = 1;
976 llvm::ArrayType *llvmArrayType =
977 dyn_cast<llvm::ArrayType>(
978 cast<llvm::PointerType>(addr->getType())->getElementType());
979 while (llvmArrayType) {
980 assert(isa<ConstantArrayType>(arrayType));
981 assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue()
982 == llvmArrayType->getNumElements());
984 gepIndices.push_back(zero);
985 countFromCLAs *= llvmArrayType->getNumElements();
986 eltType = arrayType->getElementType();
989 dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType());
990 arrayType = getContext().getAsArrayType(arrayType->getElementType());
991 assert((!llvmArrayType || arrayType) &&
992 "LLVM and Clang types are out-of-synch");
996 // From this point onwards, the Clang array type has been emitted
997 // as some other type (probably a packed struct). Compute the array
998 // size, and just emit the 'begin' expression as a bitcast.
1001 cast<ConstantArrayType>(arrayType)->getSize().getZExtValue();
1002 eltType = arrayType->getElementType();
1003 arrayType = getContext().getAsArrayType(eltType);
1006 unsigned AddressSpace = addr->getType()->getPointerAddressSpace();
1007 llvm::Type *BaseType = ConvertType(eltType)->getPointerTo(AddressSpace);
1008 addr = Builder.CreateBitCast(addr, BaseType, "array.begin");
1010 // Create the actual GEP.
1011 addr = Builder.CreateInBoundsGEP(addr, gepIndices, "array.begin");
1016 llvm::Value *numElements
1017 = llvm::ConstantInt::get(SizeTy, countFromCLAs);
1019 // If we had any VLA dimensions, factor them in.
1021 numElements = Builder.CreateNUWMul(numVLAElements, numElements);
1026 std::pair<llvm::Value*, QualType>
1027 CodeGenFunction::getVLASize(QualType type) {
1028 const VariableArrayType *vla = getContext().getAsVariableArrayType(type);
1029 assert(vla && "type was not a variable array type!");
1030 return getVLASize(vla);
1033 std::pair<llvm::Value*, QualType>
1034 CodeGenFunction::getVLASize(const VariableArrayType *type) {
1035 // The number of elements so far; always size_t.
1036 llvm::Value *numElements = 0;
1038 QualType elementType;
1040 elementType = type->getElementType();
1041 llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()];
1042 assert(vlaSize && "no size for VLA!");
1043 assert(vlaSize->getType() == SizeTy);
1046 numElements = vlaSize;
1048 // It's undefined behavior if this wraps around, so mark it that way.
1049 // FIXME: Teach -fcatch-undefined-behavior to trap this.
1050 numElements = Builder.CreateNUWMul(numElements, vlaSize);
1052 } while ((type = getContext().getAsVariableArrayType(elementType)));
1054 return std::pair<llvm::Value*,QualType>(numElements, elementType);
1057 void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
1058 assert(type->isVariablyModifiedType() &&
1059 "Must pass variably modified type to EmitVLASizes!");
1061 EnsureInsertPoint();
1063 // We're going to walk down into the type and look for VLA
1066 assert(type->isVariablyModifiedType());
1068 const Type *ty = type.getTypePtr();
1069 switch (ty->getTypeClass()) {
1071 #define TYPE(Class, Base)
1072 #define ABSTRACT_TYPE(Class, Base)
1073 #define NON_CANONICAL_TYPE(Class, Base)
1074 #define DEPENDENT_TYPE(Class, Base) case Type::Class:
1075 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
1076 #include "clang/AST/TypeNodes.def"
1077 llvm_unreachable("unexpected dependent type!");
1079 // These types are never variably-modified.
1083 case Type::ExtVector:
1086 case Type::Elaborated:
1087 case Type::TemplateSpecialization:
1088 case Type::ObjCObject:
1089 case Type::ObjCInterface:
1090 case Type::ObjCObjectPointer:
1091 llvm_unreachable("type class is never variably-modified!");
1094 type = cast<PointerType>(ty)->getPointeeType();
1097 case Type::BlockPointer:
1098 type = cast<BlockPointerType>(ty)->getPointeeType();
1101 case Type::LValueReference:
1102 case Type::RValueReference:
1103 type = cast<ReferenceType>(ty)->getPointeeType();
1106 case Type::MemberPointer:
1107 type = cast<MemberPointerType>(ty)->getPointeeType();
1110 case Type::ConstantArray:
1111 case Type::IncompleteArray:
1112 // Losing element qualification here is fine.
1113 type = cast<ArrayType>(ty)->getElementType();
1116 case Type::VariableArray: {
1117 // Losing element qualification here is fine.
1118 const VariableArrayType *vat = cast<VariableArrayType>(ty);
1120 // Unknown size indication requires no size computation.
1121 // Otherwise, evaluate and record it.
1122 if (const Expr *size = vat->getSizeExpr()) {
1123 // It's possible that we might have emitted this already,
1124 // e.g. with a typedef and a pointer to it.
1125 llvm::Value *&entry = VLASizeMap[size];
1127 llvm::Value *Size = EmitScalarExpr(size);
1130 // If the size is an expression that is not an integer constant
1131 // expression [...] each time it is evaluated it shall have a value
1132 // greater than zero.
1133 if (getLangOpts().SanitizeVLABound &&
1134 size->getType()->isSignedIntegerType()) {
1135 llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType());
1136 llvm::Constant *StaticArgs[] = {
1137 EmitCheckSourceLocation(size->getLocStart()),
1138 EmitCheckTypeDescriptor(size->getType())
1140 EmitCheck(Builder.CreateICmpSGT(Size, Zero),
1141 "vla_bound_not_positive", StaticArgs, Size);
1144 // Always zexting here would be wrong if it weren't
1145 // undefined behavior to have a negative bound.
1146 entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false);
1149 type = vat->getElementType();
1153 case Type::FunctionProto:
1154 case Type::FunctionNoProto:
1155 type = cast<FunctionType>(ty)->getResultType();
1160 case Type::UnaryTransform:
1161 case Type::Attributed:
1162 case Type::SubstTemplateTypeParm:
1163 // Keep walking after single level desugaring.
1164 type = type.getSingleStepDesugaredType(getContext());
1168 case Type::Decltype:
1170 // Stop walking: nothing to do.
1173 case Type::TypeOfExpr:
1174 // Stop walking: emit typeof expression.
1175 EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr());
1179 type = cast<AtomicType>(ty)->getValueType();
1182 } while (type->isVariablyModifiedType());
1185 llvm::Value* CodeGenFunction::EmitVAListRef(const Expr* E) {
1186 if (getContext().getBuiltinVaListType()->isArrayType())
1187 return EmitScalarExpr(E);
1188 return EmitLValue(E).getAddress();
1191 void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E,
1192 llvm::Constant *Init) {
1193 assert (Init && "Invalid DeclRefExpr initializer!");
1194 if (CGDebugInfo *Dbg = getDebugInfo())
1195 if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
1196 Dbg->EmitGlobalVariable(E->getDecl(), Init);
1199 CodeGenFunction::PeepholeProtection
1200 CodeGenFunction::protectFromPeepholes(RValue rvalue) {
1201 // At the moment, the only aggressive peephole we do in IR gen
1202 // is trunc(zext) folding, but if we add more, we can easily
1203 // extend this protection.
1205 if (!rvalue.isScalar()) return PeepholeProtection();
1206 llvm::Value *value = rvalue.getScalarVal();
1207 if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection();
1209 // Just make an extra bitcast.
1210 assert(HaveInsertPoint());
1211 llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "",
1212 Builder.GetInsertBlock());
1214 PeepholeProtection protection;
1215 protection.Inst = inst;
1219 void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) {
1220 if (!protection.Inst) return;
1222 // In theory, we could try to duplicate the peepholes now, but whatever.
1223 protection.Inst->eraseFromParent();
1226 llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Value *AnnotationFn,
1227 llvm::Value *AnnotatedVal,
1228 llvm::StringRef AnnotationStr,
1229 SourceLocation Location) {
1230 llvm::Value *Args[4] = {
1232 Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy),
1233 Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy),
1234 CGM.EmitAnnotationLineNo(Location)
1236 return Builder.CreateCall(AnnotationFn, Args);
1239 void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) {
1240 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1241 // FIXME We create a new bitcast for every annotation because that's what
1242 // llvm-gcc was doing.
1243 for (specific_attr_iterator<AnnotateAttr>
1244 ai = D->specific_attr_begin<AnnotateAttr>(),
1245 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1246 EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation),
1247 Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()),
1248 (*ai)->getAnnotation(), D->getLocation());
1251 llvm::Value *CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D,
1253 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1254 llvm::Type *VTy = V->getType();
1255 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation,
1258 for (specific_attr_iterator<AnnotateAttr>
1259 ai = D->specific_attr_begin<AnnotateAttr>(),
1260 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai) {
1261 // FIXME Always emit the cast inst so we can differentiate between
1262 // annotation on the first field of a struct and annotation on the struct
1264 if (VTy != CGM.Int8PtrTy)
1265 V = Builder.Insert(new llvm::BitCastInst(V, CGM.Int8PtrTy));
1266 V = EmitAnnotationCall(F, V, (*ai)->getAnnotation(), D->getLocation());
1267 V = Builder.CreateBitCast(V, VTy);