1 //===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
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 contains code to emit Expr nodes as LLVM code.
12 //===----------------------------------------------------------------------===//
14 #include "CodeGenFunction.h"
17 #include "CGDebugInfo.h"
18 #include "CGObjCRuntime.h"
19 #include "CGOpenMPRuntime.h"
20 #include "CGRecordLayout.h"
21 #include "CodeGenModule.h"
22 #include "TargetInfo.h"
23 #include "clang/AST/ASTContext.h"
24 #include "clang/AST/Attr.h"
25 #include "clang/AST/DeclObjC.h"
26 #include "clang/Frontend/CodeGenOptions.h"
27 #include "llvm/ADT/Hashing.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/Intrinsics.h"
31 #include "llvm/IR/LLVMContext.h"
32 #include "llvm/IR/MDBuilder.h"
33 #include "llvm/Support/ConvertUTF.h"
34 #include "llvm/Support/MathExtras.h"
36 using namespace clang;
37 using namespace CodeGen;
39 //===--------------------------------------------------------------------===//
40 // Miscellaneous Helper Methods
41 //===--------------------------------------------------------------------===//
43 llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
44 unsigned addressSpace =
45 cast<llvm::PointerType>(value->getType())->getAddressSpace();
47 llvm::PointerType *destType = Int8PtrTy;
49 destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
51 if (value->getType() == destType) return value;
52 return Builder.CreateBitCast(value, destType);
55 /// CreateTempAlloca - This creates a alloca and inserts it into the entry
57 llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
59 if (!Builder.isNamePreserving())
60 return new llvm::AllocaInst(Ty, nullptr, "", AllocaInsertPt);
61 return new llvm::AllocaInst(Ty, nullptr, Name, AllocaInsertPt);
64 void CodeGenFunction::InitTempAlloca(llvm::AllocaInst *Var,
66 auto *Store = new llvm::StoreInst(Init, Var);
67 llvm::BasicBlock *Block = AllocaInsertPt->getParent();
68 Block->getInstList().insertAfter(&*AllocaInsertPt, Store);
71 llvm::AllocaInst *CodeGenFunction::CreateIRTemp(QualType Ty,
73 llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertType(Ty), Name);
74 // FIXME: Should we prefer the preferred type alignment here?
75 CharUnits Align = getContext().getTypeAlignInChars(Ty);
76 Alloc->setAlignment(Align.getQuantity());
80 llvm::AllocaInst *CodeGenFunction::CreateMemTemp(QualType Ty,
82 llvm::AllocaInst *Alloc = CreateTempAlloca(ConvertTypeForMem(Ty), Name);
83 // FIXME: Should we prefer the preferred type alignment here?
84 CharUnits Align = getContext().getTypeAlignInChars(Ty);
85 Alloc->setAlignment(Align.getQuantity());
89 /// EvaluateExprAsBool - Perform the usual unary conversions on the specified
90 /// expression and compare the result against zero, returning an Int1Ty value.
91 llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
92 PGO.setCurrentStmt(E);
93 if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
94 llvm::Value *MemPtr = EmitScalarExpr(E);
95 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
98 QualType BoolTy = getContext().BoolTy;
99 if (!E->getType()->isAnyComplexType())
100 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy);
102 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(),BoolTy);
105 /// EmitIgnoredExpr - Emit code to compute the specified expression,
106 /// ignoring the result.
107 void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
109 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
111 // Just emit it as an l-value and drop the result.
115 /// EmitAnyExpr - Emit code to compute the specified expression which
116 /// can have any type. The result is returned as an RValue struct.
117 /// If this is an aggregate expression, AggSlot indicates where the
118 /// result should be returned.
119 RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
120 AggValueSlot aggSlot,
122 switch (getEvaluationKind(E->getType())) {
124 return RValue::get(EmitScalarExpr(E, ignoreResult));
126 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
128 if (!ignoreResult && aggSlot.isIgnored())
129 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
130 EmitAggExpr(E, aggSlot);
131 return aggSlot.asRValue();
133 llvm_unreachable("bad evaluation kind");
136 /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will
137 /// always be accessible even if no aggregate location is provided.
138 RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
139 AggValueSlot AggSlot = AggValueSlot::ignored();
141 if (hasAggregateEvaluationKind(E->getType()))
142 AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
143 return EmitAnyExpr(E, AggSlot);
146 /// EmitAnyExprToMem - Evaluate an expression into a given memory
148 void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
149 llvm::Value *Location,
152 // FIXME: This function should take an LValue as an argument.
153 switch (getEvaluationKind(E->getType())) {
155 EmitComplexExprIntoLValue(E,
156 MakeNaturalAlignAddrLValue(Location, E->getType()),
160 case TEK_Aggregate: {
161 CharUnits Alignment = getContext().getTypeAlignInChars(E->getType());
162 EmitAggExpr(E, AggValueSlot::forAddr(Location, Alignment, Quals,
163 AggValueSlot::IsDestructed_t(IsInit),
164 AggValueSlot::DoesNotNeedGCBarriers,
165 AggValueSlot::IsAliased_t(!IsInit)));
170 RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
171 LValue LV = MakeAddrLValue(Location, E->getType());
172 EmitStoreThroughLValue(RV, LV);
176 llvm_unreachable("bad evaluation kind");
180 pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
181 const Expr *E, llvm::Value *ReferenceTemporary) {
182 // Objective-C++ ARC:
183 // If we are binding a reference to a temporary that has ownership, we
184 // need to perform retain/release operations on the temporary.
186 // FIXME: This should be looking at E, not M.
187 if (CGF.getLangOpts().ObjCAutoRefCount &&
188 M->getType()->isObjCLifetimeType()) {
189 QualType ObjCARCReferenceLifetimeType = M->getType();
190 switch (Qualifiers::ObjCLifetime Lifetime =
191 ObjCARCReferenceLifetimeType.getObjCLifetime()) {
192 case Qualifiers::OCL_None:
193 case Qualifiers::OCL_ExplicitNone:
194 // Carry on to normal cleanup handling.
197 case Qualifiers::OCL_Autoreleasing:
198 // Nothing to do; cleaned up by an autorelease pool.
201 case Qualifiers::OCL_Strong:
202 case Qualifiers::OCL_Weak:
203 switch (StorageDuration Duration = M->getStorageDuration()) {
205 // Note: we intentionally do not register a cleanup to release
206 // the object on program termination.
210 // FIXME: We should probably register a cleanup in this case.
214 case SD_FullExpression:
215 CodeGenFunction::Destroyer *Destroy;
216 CleanupKind CleanupKind;
217 if (Lifetime == Qualifiers::OCL_Strong) {
218 const ValueDecl *VD = M->getExtendingDecl();
220 VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
221 CleanupKind = CGF.getARCCleanupKind();
222 Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
223 : &CodeGenFunction::destroyARCStrongImprecise;
225 // __weak objects always get EH cleanups; otherwise, exceptions
226 // could cause really nasty crashes instead of mere leaks.
227 CleanupKind = NormalAndEHCleanup;
228 Destroy = &CodeGenFunction::destroyARCWeak;
230 if (Duration == SD_FullExpression)
231 CGF.pushDestroy(CleanupKind, ReferenceTemporary,
232 ObjCARCReferenceLifetimeType, *Destroy,
233 CleanupKind & EHCleanup);
235 CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
236 ObjCARCReferenceLifetimeType,
237 *Destroy, CleanupKind & EHCleanup);
241 llvm_unreachable("temporary cannot have dynamic storage duration");
243 llvm_unreachable("unknown storage duration");
247 CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
248 if (const RecordType *RT =
249 E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
250 // Get the destructor for the reference temporary.
251 auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
252 if (!ClassDecl->hasTrivialDestructor())
253 ReferenceTemporaryDtor = ClassDecl->getDestructor();
256 if (!ReferenceTemporaryDtor)
259 // Call the destructor for the temporary.
260 switch (M->getStorageDuration()) {
263 llvm::Constant *CleanupFn;
264 llvm::Constant *CleanupArg;
265 if (E->getType()->isArrayType()) {
266 CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
267 cast<llvm::Constant>(ReferenceTemporary), E->getType(),
268 CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
269 dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
270 CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
272 CleanupFn = CGF.CGM.getAddrOfCXXStructor(ReferenceTemporaryDtor,
273 StructorType::Complete);
274 CleanupArg = cast<llvm::Constant>(ReferenceTemporary);
276 CGF.CGM.getCXXABI().registerGlobalDtor(
277 CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
281 case SD_FullExpression:
282 CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
283 CodeGenFunction::destroyCXXObject,
284 CGF.getLangOpts().Exceptions);
288 CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
289 ReferenceTemporary, E->getType(),
290 CodeGenFunction::destroyCXXObject,
291 CGF.getLangOpts().Exceptions);
295 llvm_unreachable("temporary cannot have dynamic storage duration");
300 createReferenceTemporary(CodeGenFunction &CGF,
301 const MaterializeTemporaryExpr *M, const Expr *Inner) {
302 switch (M->getStorageDuration()) {
303 case SD_FullExpression:
305 // If we have a constant temporary array or record try to promote it into a
306 // constant global under the same rules a normal constant would've been
307 // promoted. This is easier on the optimizer and generally emits fewer
309 QualType Ty = Inner->getType();
310 if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
311 (Ty->isArrayType() || Ty->isRecordType()) &&
312 CGF.CGM.isTypeConstant(Ty, true))
313 if (llvm::Constant *Init = CGF.CGM.EmitConstantExpr(Inner, Ty, &CGF)) {
314 auto *GV = new llvm::GlobalVariable(
315 CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
316 llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp");
318 CGF.getContext().getTypeAlignInChars(Ty).getQuantity());
319 // FIXME: Should we put the new global into a COMDAT?
322 return CGF.CreateMemTemp(Ty, "ref.tmp");
326 return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
329 llvm_unreachable("temporary can't have dynamic storage duration");
331 llvm_unreachable("unknown storage duration");
334 LValue CodeGenFunction::
335 EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
336 const Expr *E = M->GetTemporaryExpr();
338 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
339 // as that will cause the lifetime adjustment to be lost for ARC
340 if (getLangOpts().ObjCAutoRefCount &&
341 M->getType()->isObjCLifetimeType() &&
342 M->getType().getObjCLifetime() != Qualifiers::OCL_None &&
343 M->getType().getObjCLifetime() != Qualifiers::OCL_ExplicitNone) {
344 llvm::Value *Object = createReferenceTemporary(*this, M, E);
345 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object)) {
346 Object = llvm::ConstantExpr::getBitCast(
347 Var, ConvertTypeForMem(E->getType())->getPointerTo());
348 // We should not have emitted the initializer for this temporary as a
350 assert(!Var->hasInitializer());
351 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
353 LValue RefTempDst = MakeAddrLValue(Object, M->getType());
355 switch (getEvaluationKind(E->getType())) {
356 default: llvm_unreachable("expected scalar or aggregate expression");
358 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
360 case TEK_Aggregate: {
361 CharUnits Alignment = getContext().getTypeAlignInChars(E->getType());
362 EmitAggExpr(E, AggValueSlot::forAddr(Object, Alignment,
363 E->getType().getQualifiers(),
364 AggValueSlot::IsDestructed,
365 AggValueSlot::DoesNotNeedGCBarriers,
366 AggValueSlot::IsNotAliased));
371 pushTemporaryCleanup(*this, M, E, Object);
375 SmallVector<const Expr *, 2> CommaLHSs;
376 SmallVector<SubobjectAdjustment, 2> Adjustments;
377 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
379 for (const auto &Ignored : CommaLHSs)
380 EmitIgnoredExpr(Ignored);
382 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
383 if (opaque->getType()->isRecordType()) {
384 assert(Adjustments.empty());
385 return EmitOpaqueValueLValue(opaque);
389 // Create and initialize the reference temporary.
390 llvm::Value *Object = createReferenceTemporary(*this, M, E);
391 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object)) {
392 Object = llvm::ConstantExpr::getBitCast(
393 Var, ConvertTypeForMem(E->getType())->getPointerTo());
394 // If the temporary is a global and has a constant initializer or is a
395 // constant temporary that we promoted to a global, we may have already
397 if (!Var->hasInitializer()) {
398 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
399 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
402 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
404 pushTemporaryCleanup(*this, M, E, Object);
406 // Perform derived-to-base casts and/or field accesses, to get from the
407 // temporary object we created (and, potentially, for which we extended
408 // the lifetime) to the subobject we're binding the reference to.
409 for (unsigned I = Adjustments.size(); I != 0; --I) {
410 SubobjectAdjustment &Adjustment = Adjustments[I-1];
411 switch (Adjustment.Kind) {
412 case SubobjectAdjustment::DerivedToBaseAdjustment:
414 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
415 Adjustment.DerivedToBase.BasePath->path_begin(),
416 Adjustment.DerivedToBase.BasePath->path_end(),
417 /*NullCheckValue=*/ false, E->getExprLoc());
420 case SubobjectAdjustment::FieldAdjustment: {
421 LValue LV = MakeAddrLValue(Object, E->getType());
422 LV = EmitLValueForField(LV, Adjustment.Field);
423 assert(LV.isSimple() &&
424 "materialized temporary field is not a simple lvalue");
425 Object = LV.getAddress();
429 case SubobjectAdjustment::MemberPointerAdjustment: {
430 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
431 Object = CGM.getCXXABI().EmitMemberDataPointerAddress(
432 *this, E, Object, Ptr, Adjustment.Ptr.MPT);
438 return MakeAddrLValue(Object, M->getType());
442 CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
443 // Emit the expression as an lvalue.
444 LValue LV = EmitLValue(E);
445 assert(LV.isSimple());
446 llvm::Value *Value = LV.getAddress();
448 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
449 // C++11 [dcl.ref]p5 (as amended by core issue 453):
450 // If a glvalue to which a reference is directly bound designates neither
451 // an existing object or function of an appropriate type nor a region of
452 // storage of suitable size and alignment to contain an object of the
453 // reference's type, the behavior is undefined.
454 QualType Ty = E->getType();
455 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
458 return RValue::get(Value);
462 /// getAccessedFieldNo - Given an encoded value and a result number, return the
463 /// input field number being accessed.
464 unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
465 const llvm::Constant *Elts) {
466 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
470 /// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
471 static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
473 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
474 llvm::Value *K47 = Builder.getInt64(47);
475 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
476 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
477 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
478 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
479 return Builder.CreateMul(B1, KMul);
482 bool CodeGenFunction::sanitizePerformTypeCheck() const {
483 return SanOpts.has(SanitizerKind::Null) |
484 SanOpts.has(SanitizerKind::Alignment) |
485 SanOpts.has(SanitizerKind::ObjectSize) |
486 SanOpts.has(SanitizerKind::Vptr);
489 void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
490 llvm::Value *Address, QualType Ty,
491 CharUnits Alignment, bool SkipNullCheck) {
492 if (!sanitizePerformTypeCheck())
495 // Don't check pointers outside the default address space. The null check
496 // isn't correct, the object-size check isn't supported by LLVM, and we can't
497 // communicate the addresses to the runtime handler for the vptr check.
498 if (Address->getType()->getPointerAddressSpace())
501 SanitizerScope SanScope(this);
503 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
504 llvm::BasicBlock *Done = nullptr;
506 bool AllowNullPointers = TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
507 TCK == TCK_UpcastToVirtualBase;
508 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
510 // The glvalue must not be an empty glvalue.
511 llvm::Value *IsNonNull = Builder.CreateICmpNE(
512 Address, llvm::Constant::getNullValue(Address->getType()));
514 if (AllowNullPointers) {
515 // When performing pointer casts, it's OK if the value is null.
516 // Skip the remaining checks in that case.
517 Done = createBasicBlock("null");
518 llvm::BasicBlock *Rest = createBasicBlock("not.null");
519 Builder.CreateCondBr(IsNonNull, Rest, Done);
522 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
526 if (SanOpts.has(SanitizerKind::ObjectSize) && !Ty->isIncompleteType()) {
527 uint64_t Size = getContext().getTypeSizeInChars(Ty).getQuantity();
529 // The glvalue must refer to a large enough storage region.
530 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
532 // FIXME: Get object address space
533 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
534 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
535 llvm::Value *Min = Builder.getFalse();
536 llvm::Value *CastAddr = Builder.CreateBitCast(Address, Int8PtrTy);
537 llvm::Value *LargeEnough =
538 Builder.CreateICmpUGE(Builder.CreateCall(F, {CastAddr, Min}),
539 llvm::ConstantInt::get(IntPtrTy, Size));
540 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
543 uint64_t AlignVal = 0;
545 if (SanOpts.has(SanitizerKind::Alignment)) {
546 AlignVal = Alignment.getQuantity();
547 if (!Ty->isIncompleteType() && !AlignVal)
548 AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
550 // The glvalue must be suitably aligned.
553 Builder.CreateAnd(Builder.CreatePtrToInt(Address, IntPtrTy),
554 llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
555 llvm::Value *Aligned =
556 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
557 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
561 if (Checks.size() > 0) {
562 llvm::Constant *StaticData[] = {
563 EmitCheckSourceLocation(Loc),
564 EmitCheckTypeDescriptor(Ty),
565 llvm::ConstantInt::get(SizeTy, AlignVal),
566 llvm::ConstantInt::get(Int8Ty, TCK)
568 EmitCheck(Checks, "type_mismatch", StaticData, Address);
571 // If possible, check that the vptr indicates that there is a subobject of
572 // type Ty at offset zero within this object.
574 // C++11 [basic.life]p5,6:
575 // [For storage which does not refer to an object within its lifetime]
576 // The program has undefined behavior if:
577 // -- the [pointer or glvalue] is used to access a non-static data member
578 // or call a non-static member function
579 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
580 if (SanOpts.has(SanitizerKind::Vptr) &&
581 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
582 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
583 TCK == TCK_UpcastToVirtualBase) &&
584 RD && RD->hasDefinition() && RD->isDynamicClass()) {
585 // Compute a hash of the mangled name of the type.
587 // FIXME: This is not guaranteed to be deterministic! Move to a
588 // fingerprinting mechanism once LLVM provides one. For the time
589 // being the implementation happens to be deterministic.
590 SmallString<64> MangledName;
591 llvm::raw_svector_ostream Out(MangledName);
592 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
595 // Blacklist based on the mangled type.
596 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
598 llvm::hash_code TypeHash = hash_value(Out.str());
600 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
601 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
602 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
603 llvm::Value *VPtrAddr = Builder.CreateBitCast(Address, VPtrTy);
604 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
605 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
607 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
608 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
610 // Look the hash up in our cache.
611 const int CacheSize = 128;
612 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
613 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
614 "__ubsan_vptr_type_cache");
615 llvm::Value *Slot = Builder.CreateAnd(Hash,
616 llvm::ConstantInt::get(IntPtrTy,
618 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
619 llvm::Value *CacheVal =
620 Builder.CreateLoad(Builder.CreateInBoundsGEP(Cache, Indices));
622 // If the hash isn't in the cache, call a runtime handler to perform the
623 // hard work of checking whether the vptr is for an object of the right
624 // type. This will either fill in the cache and return, or produce a
626 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
627 llvm::Constant *StaticData[] = {
628 EmitCheckSourceLocation(Loc),
629 EmitCheckTypeDescriptor(Ty),
630 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
631 llvm::ConstantInt::get(Int8Ty, TCK)
633 llvm::Value *DynamicData[] = { Address, Hash };
634 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
635 "dynamic_type_cache_miss", StaticData, DynamicData);
640 Builder.CreateBr(Done);
645 /// Determine whether this expression refers to a flexible array member in a
646 /// struct. We disable array bounds checks for such members.
647 static bool isFlexibleArrayMemberExpr(const Expr *E) {
648 // For compatibility with existing code, we treat arrays of length 0 or
649 // 1 as flexible array members.
650 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
651 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
652 if (CAT->getSize().ugt(1))
654 } else if (!isa<IncompleteArrayType>(AT))
657 E = E->IgnoreParens();
659 // A flexible array member must be the last member in the class.
660 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
661 // FIXME: If the base type of the member expr is not FD->getParent(),
662 // this should not be treated as a flexible array member access.
663 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
664 RecordDecl::field_iterator FI(
665 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
666 return ++FI == FD->getParent()->field_end();
673 /// If Base is known to point to the start of an array, return the length of
674 /// that array. Return 0 if the length cannot be determined.
675 static llvm::Value *getArrayIndexingBound(
676 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
677 // For the vector indexing extension, the bound is the number of elements.
678 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
679 IndexedType = Base->getType();
680 return CGF.Builder.getInt32(VT->getNumElements());
683 Base = Base->IgnoreParens();
685 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
686 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
687 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
688 IndexedType = CE->getSubExpr()->getType();
689 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
690 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
691 return CGF.Builder.getInt(CAT->getSize());
692 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
693 return CGF.getVLASize(VAT).first;
700 void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
701 llvm::Value *Index, QualType IndexType,
703 assert(SanOpts.has(SanitizerKind::ArrayBounds) &&
704 "should not be called unless adding bounds checks");
705 SanitizerScope SanScope(this);
707 QualType IndexedType;
708 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
712 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
713 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
714 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
716 llvm::Constant *StaticData[] = {
717 EmitCheckSourceLocation(E->getExprLoc()),
718 EmitCheckTypeDescriptor(IndexedType),
719 EmitCheckTypeDescriptor(IndexType)
721 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
722 : Builder.CreateICmpULE(IndexVal, BoundVal);
723 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds), "out_of_bounds",
728 CodeGenFunction::ComplexPairTy CodeGenFunction::
729 EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
730 bool isInc, bool isPre) {
731 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
733 llvm::Value *NextVal;
734 if (isa<llvm::IntegerType>(InVal.first->getType())) {
735 uint64_t AmountVal = isInc ? 1 : -1;
736 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
738 // Add the inc/dec to the real part.
739 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
741 QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
742 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
745 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
747 // Add the inc/dec to the real part.
748 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
751 ComplexPairTy IncVal(NextVal, InVal.second);
753 // Store the updated result through the lvalue.
754 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
756 // If this is a postinc, return the value read from memory, otherwise use the
758 return isPre ? IncVal : InVal;
761 //===----------------------------------------------------------------------===//
762 // LValue Expression Emission
763 //===----------------------------------------------------------------------===//
765 RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
766 if (Ty->isVoidType())
767 return RValue::get(nullptr);
769 switch (getEvaluationKind(Ty)) {
772 ConvertType(Ty->castAs<ComplexType>()->getElementType());
773 llvm::Value *U = llvm::UndefValue::get(EltTy);
774 return RValue::getComplex(std::make_pair(U, U));
777 // If this is a use of an undefined aggregate type, the aggregate must have an
778 // identifiable address. Just because the contents of the value are undefined
779 // doesn't mean that the address can't be taken and compared.
780 case TEK_Aggregate: {
781 llvm::Value *DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
782 return RValue::getAggregate(DestPtr);
786 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
788 llvm_unreachable("bad evaluation kind");
791 RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
793 ErrorUnsupported(E, Name);
794 return GetUndefRValue(E->getType());
797 LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
799 ErrorUnsupported(E, Name);
800 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
801 return MakeAddrLValue(llvm::UndefValue::get(Ty), E->getType());
804 LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
806 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
807 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
810 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple())
811 EmitTypeCheck(TCK, E->getExprLoc(), LV.getAddress(),
812 E->getType(), LV.getAlignment());
816 /// EmitLValue - Emit code to compute a designator that specifies the location
817 /// of the expression.
819 /// This can return one of two things: a simple address or a bitfield reference.
820 /// In either case, the LLVM Value* in the LValue structure is guaranteed to be
821 /// an LLVM pointer type.
823 /// If this returns a bitfield reference, nothing about the pointee type of the
824 /// LLVM value is known: For example, it may not be a pointer to an integer.
826 /// If this returns a normal address, and if the lvalue's C type is fixed size,
827 /// this method guarantees that the returned pointer type will point to an LLVM
828 /// type of the same size of the lvalue's type. If the lvalue has a variable
829 /// length type, this is not possible.
831 LValue CodeGenFunction::EmitLValue(const Expr *E) {
832 ApplyDebugLocation DL(*this, E);
833 switch (E->getStmtClass()) {
834 default: return EmitUnsupportedLValue(E, "l-value expression");
836 case Expr::ObjCPropertyRefExprClass:
837 llvm_unreachable("cannot emit a property reference directly");
839 case Expr::ObjCSelectorExprClass:
840 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
841 case Expr::ObjCIsaExprClass:
842 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
843 case Expr::BinaryOperatorClass:
844 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
845 case Expr::CompoundAssignOperatorClass: {
846 QualType Ty = E->getType();
847 if (const AtomicType *AT = Ty->getAs<AtomicType>())
848 Ty = AT->getValueType();
849 if (!Ty->isAnyComplexType())
850 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
851 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
853 case Expr::CallExprClass:
854 case Expr::CXXMemberCallExprClass:
855 case Expr::CXXOperatorCallExprClass:
856 case Expr::UserDefinedLiteralClass:
857 return EmitCallExprLValue(cast<CallExpr>(E));
858 case Expr::VAArgExprClass:
859 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
860 case Expr::DeclRefExprClass:
861 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
862 case Expr::ParenExprClass:
863 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
864 case Expr::GenericSelectionExprClass:
865 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
866 case Expr::PredefinedExprClass:
867 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
868 case Expr::StringLiteralClass:
869 return EmitStringLiteralLValue(cast<StringLiteral>(E));
870 case Expr::ObjCEncodeExprClass:
871 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
872 case Expr::PseudoObjectExprClass:
873 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
874 case Expr::InitListExprClass:
875 return EmitInitListLValue(cast<InitListExpr>(E));
876 case Expr::CXXTemporaryObjectExprClass:
877 case Expr::CXXConstructExprClass:
878 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
879 case Expr::CXXBindTemporaryExprClass:
880 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
881 case Expr::CXXUuidofExprClass:
882 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
883 case Expr::LambdaExprClass:
884 return EmitLambdaLValue(cast<LambdaExpr>(E));
886 case Expr::ExprWithCleanupsClass: {
887 const auto *cleanups = cast<ExprWithCleanups>(E);
888 enterFullExpression(cleanups);
889 RunCleanupsScope Scope(*this);
890 return EmitLValue(cleanups->getSubExpr());
893 case Expr::CXXDefaultArgExprClass:
894 return EmitLValue(cast<CXXDefaultArgExpr>(E)->getExpr());
895 case Expr::CXXDefaultInitExprClass: {
896 CXXDefaultInitExprScope Scope(*this);
897 return EmitLValue(cast<CXXDefaultInitExpr>(E)->getExpr());
899 case Expr::CXXTypeidExprClass:
900 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
902 case Expr::ObjCMessageExprClass:
903 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
904 case Expr::ObjCIvarRefExprClass:
905 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
906 case Expr::StmtExprClass:
907 return EmitStmtExprLValue(cast<StmtExpr>(E));
908 case Expr::UnaryOperatorClass:
909 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
910 case Expr::ArraySubscriptExprClass:
911 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
912 case Expr::ExtVectorElementExprClass:
913 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
914 case Expr::MemberExprClass:
915 return EmitMemberExpr(cast<MemberExpr>(E));
916 case Expr::CompoundLiteralExprClass:
917 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
918 case Expr::ConditionalOperatorClass:
919 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
920 case Expr::BinaryConditionalOperatorClass:
921 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
922 case Expr::ChooseExprClass:
923 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
924 case Expr::OpaqueValueExprClass:
925 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
926 case Expr::SubstNonTypeTemplateParmExprClass:
927 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
928 case Expr::ImplicitCastExprClass:
929 case Expr::CStyleCastExprClass:
930 case Expr::CXXFunctionalCastExprClass:
931 case Expr::CXXStaticCastExprClass:
932 case Expr::CXXDynamicCastExprClass:
933 case Expr::CXXReinterpretCastExprClass:
934 case Expr::CXXConstCastExprClass:
935 case Expr::ObjCBridgedCastExprClass:
936 return EmitCastLValue(cast<CastExpr>(E));
938 case Expr::MaterializeTemporaryExprClass:
939 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
943 /// Given an object of the given canonical type, can we safely copy a
944 /// value out of it based on its initializer?
945 static bool isConstantEmittableObjectType(QualType type) {
946 assert(type.isCanonical());
947 assert(!type->isReferenceType());
949 // Must be const-qualified but non-volatile.
950 Qualifiers qs = type.getLocalQualifiers();
951 if (!qs.hasConst() || qs.hasVolatile()) return false;
953 // Otherwise, all object types satisfy this except C++ classes with
954 // mutable subobjects or non-trivial copy/destroy behavior.
955 if (const auto *RT = dyn_cast<RecordType>(type))
956 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
957 if (RD->hasMutableFields() || !RD->isTrivial())
963 /// Can we constant-emit a load of a reference to a variable of the
964 /// given type? This is different from predicates like
965 /// Decl::isUsableInConstantExpressions because we do want it to apply
966 /// in situations that don't necessarily satisfy the language's rules
967 /// for this (e.g. C++'s ODR-use rules). For example, we want to able
968 /// to do this with const float variables even if those variables
969 /// aren't marked 'constexpr'.
970 enum ConstantEmissionKind {
973 CEK_AsValueOrReference,
976 static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
977 type = type.getCanonicalType();
978 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
979 if (isConstantEmittableObjectType(ref->getPointeeType()))
980 return CEK_AsValueOrReference;
981 return CEK_AsReferenceOnly;
983 if (isConstantEmittableObjectType(type))
984 return CEK_AsValueOnly;
988 /// Try to emit a reference to the given value without producing it as
989 /// an l-value. This is actually more than an optimization: we can't
990 /// produce an l-value for variables that we never actually captured
991 /// in a block or lambda, which means const int variables or constexpr
992 /// literals or similar.
993 CodeGenFunction::ConstantEmission
994 CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
995 ValueDecl *value = refExpr->getDecl();
997 // The value needs to be an enum constant or a constant variable.
998 ConstantEmissionKind CEK;
999 if (isa<ParmVarDecl>(value)) {
1001 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1002 CEK = checkVarTypeForConstantEmission(var->getType());
1003 } else if (isa<EnumConstantDecl>(value)) {
1004 CEK = CEK_AsValueOnly;
1008 if (CEK == CEK_None) return ConstantEmission();
1010 Expr::EvalResult result;
1011 bool resultIsReference;
1012 QualType resultType;
1014 // It's best to evaluate all the way as an r-value if that's permitted.
1015 if (CEK != CEK_AsReferenceOnly &&
1016 refExpr->EvaluateAsRValue(result, getContext())) {
1017 resultIsReference = false;
1018 resultType = refExpr->getType();
1020 // Otherwise, try to evaluate as an l-value.
1021 } else if (CEK != CEK_AsValueOnly &&
1022 refExpr->EvaluateAsLValue(result, getContext())) {
1023 resultIsReference = true;
1024 resultType = value->getType();
1028 return ConstantEmission();
1031 // In any case, if the initializer has side-effects, abandon ship.
1032 if (result.HasSideEffects)
1033 return ConstantEmission();
1035 // Emit as a constant.
1036 llvm::Constant *C = CGM.EmitConstantValue(result.Val, resultType, this);
1038 // Make sure we emit a debug reference to the global variable.
1039 // This should probably fire even for
1040 if (isa<VarDecl>(value)) {
1041 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1042 EmitDeclRefExprDbgValue(refExpr, C);
1044 assert(isa<EnumConstantDecl>(value));
1045 EmitDeclRefExprDbgValue(refExpr, C);
1048 // If we emitted a reference constant, we need to dereference that.
1049 if (resultIsReference)
1050 return ConstantEmission::forReference(C);
1052 return ConstantEmission::forValue(C);
1055 llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1056 SourceLocation Loc) {
1057 return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
1058 lvalue.getAlignment().getQuantity(),
1059 lvalue.getType(), Loc, lvalue.getTBAAInfo(),
1060 lvalue.getTBAABaseType(), lvalue.getTBAAOffset());
1063 static bool hasBooleanRepresentation(QualType Ty) {
1064 if (Ty->isBooleanType())
1067 if (const EnumType *ET = Ty->getAs<EnumType>())
1068 return ET->getDecl()->getIntegerType()->isBooleanType();
1070 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1071 return hasBooleanRepresentation(AT->getValueType());
1076 static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1077 llvm::APInt &Min, llvm::APInt &End,
1079 const EnumType *ET = Ty->getAs<EnumType>();
1080 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1081 ET && !ET->getDecl()->isFixed();
1082 bool IsBool = hasBooleanRepresentation(Ty);
1083 if (!IsBool && !IsRegularCPlusPlusEnum)
1087 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1088 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1090 const EnumDecl *ED = ET->getDecl();
1091 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1092 unsigned Bitwidth = LTy->getScalarSizeInBits();
1093 unsigned NumNegativeBits = ED->getNumNegativeBits();
1094 unsigned NumPositiveBits = ED->getNumPositiveBits();
1096 if (NumNegativeBits) {
1097 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1098 assert(NumBits <= Bitwidth);
1099 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1102 assert(NumPositiveBits <= Bitwidth);
1103 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1104 Min = llvm::APInt(Bitwidth, 0);
1110 llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1111 llvm::APInt Min, End;
1112 if (!getRangeForType(*this, Ty, Min, End,
1113 CGM.getCodeGenOpts().StrictEnums))
1116 llvm::MDBuilder MDHelper(getLLVMContext());
1117 return MDHelper.createRange(Min, End);
1120 llvm::Value *CodeGenFunction::EmitLoadOfScalar(llvm::Value *Addr, bool Volatile,
1121 unsigned Alignment, QualType Ty,
1123 llvm::MDNode *TBAAInfo,
1124 QualType TBAABaseType,
1125 uint64_t TBAAOffset) {
1126 // For better performance, handle vector loads differently.
1127 if (Ty->isVectorType()) {
1129 const llvm::Type *EltTy =
1130 cast<llvm::PointerType>(Addr->getType())->getElementType();
1132 const auto *VTy = cast<llvm::VectorType>(EltTy);
1134 // Handle vectors of size 3, like size 4 for better performance.
1135 if (VTy->getNumElements() == 3) {
1137 // Bitcast to vec4 type.
1138 llvm::VectorType *vec4Ty = llvm::VectorType::get(VTy->getElementType(),
1140 llvm::PointerType *ptVec4Ty =
1141 llvm::PointerType::get(vec4Ty,
1142 (cast<llvm::PointerType>(
1143 Addr->getType()))->getAddressSpace());
1144 llvm::Value *Cast = Builder.CreateBitCast(Addr, ptVec4Ty,
1147 llvm::Value *LoadVal = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1149 // Shuffle vector to get vec3.
1150 llvm::Constant *Mask[] = {
1151 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 0),
1152 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 1),
1153 llvm::ConstantInt::get(llvm::Type::getInt32Ty(getLLVMContext()), 2)
1156 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1157 V = Builder.CreateShuffleVector(LoadVal,
1158 llvm::UndefValue::get(vec4Ty),
1159 MaskV, "extractVec");
1160 return EmitFromMemory(V, Ty);
1164 // Atomic operations have to be done on integral types.
1165 if (Ty->isAtomicType() || typeIsSuitableForInlineAtomic(Ty, Volatile)) {
1166 LValue lvalue = LValue::MakeAddr(Addr, Ty,
1167 CharUnits::fromQuantity(Alignment),
1168 getContext(), TBAAInfo);
1169 return EmitAtomicLoad(lvalue, Loc).getScalarVal();
1172 llvm::LoadInst *Load = Builder.CreateLoad(Addr);
1174 Load->setVolatile(true);
1176 Load->setAlignment(Alignment);
1178 llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
1181 CGM.DecorateInstruction(Load, TBAAPath, false/*ConvertTypeToTag*/);
1184 bool NeedsBoolCheck =
1185 SanOpts.has(SanitizerKind::Bool) && hasBooleanRepresentation(Ty);
1186 bool NeedsEnumCheck =
1187 SanOpts.has(SanitizerKind::Enum) && Ty->getAs<EnumType>();
1188 if (NeedsBoolCheck || NeedsEnumCheck) {
1189 SanitizerScope SanScope(this);
1190 llvm::APInt Min, End;
1191 if (getRangeForType(*this, Ty, Min, End, true)) {
1195 Check = Builder.CreateICmpULE(
1196 Load, llvm::ConstantInt::get(getLLVMContext(), End));
1198 llvm::Value *Upper = Builder.CreateICmpSLE(
1199 Load, llvm::ConstantInt::get(getLLVMContext(), End));
1200 llvm::Value *Lower = Builder.CreateICmpSGE(
1201 Load, llvm::ConstantInt::get(getLLVMContext(), Min));
1202 Check = Builder.CreateAnd(Upper, Lower);
1204 llvm::Constant *StaticArgs[] = {
1205 EmitCheckSourceLocation(Loc),
1206 EmitCheckTypeDescriptor(Ty)
1208 SanitizerMask Kind = NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1209 EmitCheck(std::make_pair(Check, Kind), "load_invalid_value", StaticArgs,
1210 EmitCheckValue(Load));
1212 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1213 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1214 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1216 return EmitFromMemory(Load, Ty);
1219 llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1220 // Bool has a different representation in memory than in registers.
1221 if (hasBooleanRepresentation(Ty)) {
1222 // This should really always be an i1, but sometimes it's already
1223 // an i8, and it's awkward to track those cases down.
1224 if (Value->getType()->isIntegerTy(1))
1225 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1226 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
1227 "wrong value rep of bool");
1233 llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1234 // Bool has a different representation in memory than in registers.
1235 if (hasBooleanRepresentation(Ty)) {
1236 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&
1237 "wrong value rep of bool");
1238 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1244 void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr,
1245 bool Volatile, unsigned Alignment,
1246 QualType Ty, llvm::MDNode *TBAAInfo,
1247 bool isInit, QualType TBAABaseType,
1248 uint64_t TBAAOffset) {
1250 // Handle vectors differently to get better performance.
1251 if (Ty->isVectorType()) {
1252 llvm::Type *SrcTy = Value->getType();
1253 auto *VecTy = cast<llvm::VectorType>(SrcTy);
1254 // Handle vec3 special.
1255 if (VecTy->getNumElements() == 3) {
1256 llvm::LLVMContext &VMContext = getLLVMContext();
1258 // Our source is a vec3, do a shuffle vector to make it a vec4.
1259 SmallVector<llvm::Constant*, 4> Mask;
1260 Mask.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
1262 Mask.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
1264 Mask.push_back(llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
1266 Mask.push_back(llvm::UndefValue::get(llvm::Type::getInt32Ty(VMContext)));
1268 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1269 Value = Builder.CreateShuffleVector(Value,
1270 llvm::UndefValue::get(VecTy),
1271 MaskV, "extractVec");
1272 SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
1274 auto *DstPtr = cast<llvm::PointerType>(Addr->getType());
1275 if (DstPtr->getElementType() != SrcTy) {
1277 llvm::PointerType::get(SrcTy, DstPtr->getAddressSpace());
1278 Addr = Builder.CreateBitCast(Addr, MemTy, "storetmp");
1282 Value = EmitToMemory(Value, Ty);
1284 if (Ty->isAtomicType() ||
1285 (!isInit && typeIsSuitableForInlineAtomic(Ty, Volatile))) {
1286 EmitAtomicStore(RValue::get(Value),
1287 LValue::MakeAddr(Addr, Ty,
1288 CharUnits::fromQuantity(Alignment),
1289 getContext(), TBAAInfo),
1294 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1296 Store->setAlignment(Alignment);
1298 llvm::MDNode *TBAAPath = CGM.getTBAAStructTagInfo(TBAABaseType, TBAAInfo,
1301 CGM.DecorateInstruction(Store, TBAAPath, false/*ConvertTypeToTag*/);
1305 void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1307 EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
1308 lvalue.getAlignment().getQuantity(), lvalue.getType(),
1309 lvalue.getTBAAInfo(), isInit, lvalue.getTBAABaseType(),
1310 lvalue.getTBAAOffset());
1313 /// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1314 /// method emits the address of the lvalue, then loads the result as an rvalue,
1315 /// returning the rvalue.
1316 RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1317 if (LV.isObjCWeak()) {
1318 // load of a __weak object.
1319 llvm::Value *AddrWeakObj = LV.getAddress();
1320 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1323 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1324 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
1325 Object = EmitObjCConsumeObject(LV.getType(), Object);
1326 return RValue::get(Object);
1329 if (LV.isSimple()) {
1330 assert(!LV.getType()->isFunctionType());
1332 // Everything needs a load.
1333 return RValue::get(EmitLoadOfScalar(LV, Loc));
1336 if (LV.isVectorElt()) {
1337 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddr(),
1338 LV.isVolatileQualified());
1339 Load->setAlignment(LV.getAlignment().getQuantity());
1340 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1344 // If this is a reference to a subset of the elements of a vector, either
1345 // shuffle the input or extract/insert them as appropriate.
1346 if (LV.isExtVectorElt())
1347 return EmitLoadOfExtVectorElementLValue(LV);
1349 // Global Register variables always invoke intrinsics
1350 if (LV.isGlobalReg())
1351 return EmitLoadOfGlobalRegLValue(LV);
1353 assert(LV.isBitField() && "Unknown LValue type!");
1354 return EmitLoadOfBitfieldLValue(LV);
1357 RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV) {
1358 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1360 // Get the output type.
1361 llvm::Type *ResLTy = ConvertType(LV.getType());
1363 llvm::Value *Ptr = LV.getBitFieldAddr();
1364 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(),
1366 cast<llvm::LoadInst>(Val)->setAlignment(Info.StorageAlignment);
1368 if (Info.IsSigned) {
1369 assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize);
1370 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1372 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1373 if (Info.Offset + HighBits)
1374 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1377 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1378 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1379 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1383 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1385 return RValue::get(Val);
1388 // If this is a reference to a subset of the elements of a vector, create an
1389 // appropriate shufflevector.
1390 RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1391 llvm::LoadInst *Load = Builder.CreateLoad(LV.getExtVectorAddr(),
1392 LV.isVolatileQualified());
1393 Load->setAlignment(LV.getAlignment().getQuantity());
1394 llvm::Value *Vec = Load;
1396 const llvm::Constant *Elts = LV.getExtVectorElts();
1398 // If the result of the expression is a non-vector type, we must be extracting
1399 // a single element. Just codegen as an extractelement.
1400 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1402 unsigned InIdx = getAccessedFieldNo(0, Elts);
1403 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1404 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1407 // Always use shuffle vector to try to retain the original program structure
1408 unsigned NumResultElts = ExprVT->getNumElements();
1410 SmallVector<llvm::Constant*, 4> Mask;
1411 for (unsigned i = 0; i != NumResultElts; ++i)
1412 Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
1414 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1415 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1417 return RValue::get(Vec);
1420 /// @brief Generates lvalue for partial ext_vector access.
1421 llvm::Value *CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1422 llvm::Value *VectorAddress = LV.getExtVectorAddr();
1423 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1424 QualType EQT = ExprVT->getElementType();
1425 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1426 llvm::Type *VectorElementPtrToTy = VectorElementTy->getPointerTo();
1428 llvm::Value *CastToPointerElement =
1429 Builder.CreateBitCast(VectorAddress,
1430 VectorElementPtrToTy, "conv.ptr.element");
1432 const llvm::Constant *Elts = LV.getExtVectorElts();
1433 unsigned ix = getAccessedFieldNo(0, Elts);
1435 llvm::Value *VectorBasePtrPlusIx =
1436 Builder.CreateInBoundsGEP(CastToPointerElement,
1437 llvm::ConstantInt::get(SizeTy, ix), "add.ptr");
1439 return VectorBasePtrPlusIx;
1442 /// @brief Load of global gamed gegisters are always calls to intrinsics.
1443 RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
1444 assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&
1445 "Bad type for register variable");
1446 llvm::MDNode *RegName = cast<llvm::MDNode>(
1447 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
1449 // We accept integer and pointer types only
1450 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
1451 llvm::Type *Ty = OrigTy;
1452 if (OrigTy->isPointerTy())
1453 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
1454 llvm::Type *Types[] = { Ty };
1456 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
1457 llvm::Value *Call = Builder.CreateCall(
1458 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
1459 if (OrigTy->isPointerTy())
1460 Call = Builder.CreateIntToPtr(Call, OrigTy);
1461 return RValue::get(Call);
1465 /// EmitStoreThroughLValue - Store the specified rvalue into the specified
1466 /// lvalue, where both are guaranteed to the have the same type, and that type
1468 void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
1470 if (!Dst.isSimple()) {
1471 if (Dst.isVectorElt()) {
1472 // Read/modify/write the vector, inserting the new element.
1473 llvm::LoadInst *Load = Builder.CreateLoad(Dst.getVectorAddr(),
1474 Dst.isVolatileQualified());
1475 Load->setAlignment(Dst.getAlignment().getQuantity());
1476 llvm::Value *Vec = Load;
1477 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
1478 Dst.getVectorIdx(), "vecins");
1479 llvm::StoreInst *Store = Builder.CreateStore(Vec, Dst.getVectorAddr(),
1480 Dst.isVolatileQualified());
1481 Store->setAlignment(Dst.getAlignment().getQuantity());
1485 // If this is an update of extended vector elements, insert them as
1487 if (Dst.isExtVectorElt())
1488 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
1490 if (Dst.isGlobalReg())
1491 return EmitStoreThroughGlobalRegLValue(Src, Dst);
1493 assert(Dst.isBitField() && "Unknown LValue type");
1494 return EmitStoreThroughBitfieldLValue(Src, Dst);
1497 // There's special magic for assigning into an ARC-qualified l-value.
1498 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
1500 case Qualifiers::OCL_None:
1501 llvm_unreachable("present but none");
1503 case Qualifiers::OCL_ExplicitNone:
1507 case Qualifiers::OCL_Strong:
1508 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
1511 case Qualifiers::OCL_Weak:
1512 EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
1515 case Qualifiers::OCL_Autoreleasing:
1516 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
1517 Src.getScalarVal()));
1518 // fall into the normal path
1523 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
1524 // load of a __weak object.
1525 llvm::Value *LvalueDst = Dst.getAddress();
1526 llvm::Value *src = Src.getScalarVal();
1527 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
1531 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
1532 // load of a __strong object.
1533 llvm::Value *LvalueDst = Dst.getAddress();
1534 llvm::Value *src = Src.getScalarVal();
1535 if (Dst.isObjCIvar()) {
1536 assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL");
1537 llvm::Type *ResultType = ConvertType(getContext().LongTy);
1538 llvm::Value *RHS = EmitScalarExpr(Dst.getBaseIvarExp());
1539 llvm::Value *dst = RHS;
1540 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
1542 Builder.CreatePtrToInt(LvalueDst, ResultType, "sub.ptr.lhs.cast");
1543 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
1544 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
1546 } else if (Dst.isGlobalObjCRef()) {
1547 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
1548 Dst.isThreadLocalRef());
1551 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
1555 assert(Src.isScalar() && "Can't emit an agg store with this method");
1556 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
1559 void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
1560 llvm::Value **Result) {
1561 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
1562 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
1563 llvm::Value *Ptr = Dst.getBitFieldAddr();
1565 // Get the source value, truncated to the width of the bit-field.
1566 llvm::Value *SrcVal = Src.getScalarVal();
1568 // Cast the source to the storage type and shift it into place.
1569 SrcVal = Builder.CreateIntCast(SrcVal,
1570 Ptr->getType()->getPointerElementType(),
1571 /*IsSigned=*/false);
1572 llvm::Value *MaskedVal = SrcVal;
1574 // See if there are other bits in the bitfield's storage we'll need to load
1575 // and mask together with source before storing.
1576 if (Info.StorageSize != Info.Size) {
1577 assert(Info.StorageSize > Info.Size && "Invalid bitfield size.");
1578 llvm::Value *Val = Builder.CreateLoad(Ptr, Dst.isVolatileQualified(),
1580 cast<llvm::LoadInst>(Val)->setAlignment(Info.StorageAlignment);
1582 // Mask the source value as needed.
1583 if (!hasBooleanRepresentation(Dst.getType()))
1584 SrcVal = Builder.CreateAnd(SrcVal,
1585 llvm::APInt::getLowBitsSet(Info.StorageSize,
1590 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
1592 // Mask out the original value.
1593 Val = Builder.CreateAnd(Val,
1594 ~llvm::APInt::getBitsSet(Info.StorageSize,
1596 Info.Offset + Info.Size),
1599 // Or together the unchanged values and the source value.
1600 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
1602 assert(Info.Offset == 0);
1605 // Write the new value back out.
1606 llvm::StoreInst *Store = Builder.CreateStore(SrcVal, Ptr,
1607 Dst.isVolatileQualified());
1608 Store->setAlignment(Info.StorageAlignment);
1610 // Return the new value of the bit-field, if requested.
1612 llvm::Value *ResultVal = MaskedVal;
1614 // Sign extend the value if needed.
1615 if (Info.IsSigned) {
1616 assert(Info.Size <= Info.StorageSize);
1617 unsigned HighBits = Info.StorageSize - Info.Size;
1619 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
1620 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
1624 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
1626 *Result = EmitFromMemory(ResultVal, Dst.getType());
1630 void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
1632 // This access turns into a read/modify/write of the vector. Load the input
1634 llvm::LoadInst *Load = Builder.CreateLoad(Dst.getExtVectorAddr(),
1635 Dst.isVolatileQualified());
1636 Load->setAlignment(Dst.getAlignment().getQuantity());
1637 llvm::Value *Vec = Load;
1638 const llvm::Constant *Elts = Dst.getExtVectorElts();
1640 llvm::Value *SrcVal = Src.getScalarVal();
1642 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
1643 unsigned NumSrcElts = VTy->getNumElements();
1644 unsigned NumDstElts =
1645 cast<llvm::VectorType>(Vec->getType())->getNumElements();
1646 if (NumDstElts == NumSrcElts) {
1647 // Use shuffle vector is the src and destination are the same number of
1648 // elements and restore the vector mask since it is on the side it will be
1650 SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
1651 for (unsigned i = 0; i != NumSrcElts; ++i)
1652 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
1654 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1655 Vec = Builder.CreateShuffleVector(SrcVal,
1656 llvm::UndefValue::get(Vec->getType()),
1658 } else if (NumDstElts > NumSrcElts) {
1659 // Extended the source vector to the same length and then shuffle it
1660 // into the destination.
1661 // FIXME: since we're shuffling with undef, can we just use the indices
1662 // into that? This could be simpler.
1663 SmallVector<llvm::Constant*, 4> ExtMask;
1664 for (unsigned i = 0; i != NumSrcElts; ++i)
1665 ExtMask.push_back(Builder.getInt32(i));
1666 ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
1667 llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
1668 llvm::Value *ExtSrcVal =
1669 Builder.CreateShuffleVector(SrcVal,
1670 llvm::UndefValue::get(SrcVal->getType()),
1673 SmallVector<llvm::Constant*, 4> Mask;
1674 for (unsigned i = 0; i != NumDstElts; ++i)
1675 Mask.push_back(Builder.getInt32(i));
1677 // When the vector size is odd and .odd or .hi is used, the last element
1678 // of the Elts constant array will be one past the size of the vector.
1679 // Ignore the last element here, if it is greater than the mask size.
1680 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
1683 // modify when what gets shuffled in
1684 for (unsigned i = 0; i != NumSrcElts; ++i)
1685 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
1686 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1687 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
1689 // We should never shorten the vector
1690 llvm_unreachable("unexpected shorten vector length");
1693 // If the Src is a scalar (not a vector) it must be updating one element.
1694 unsigned InIdx = getAccessedFieldNo(0, Elts);
1695 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1696 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
1699 llvm::StoreInst *Store = Builder.CreateStore(Vec, Dst.getExtVectorAddr(),
1700 Dst.isVolatileQualified());
1701 Store->setAlignment(Dst.getAlignment().getQuantity());
1704 /// @brief Store of global named registers are always calls to intrinsics.
1705 void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
1706 assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&
1707 "Bad type for register variable");
1708 llvm::MDNode *RegName = cast<llvm::MDNode>(
1709 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
1710 assert(RegName && "Register LValue is not metadata");
1712 // We accept integer and pointer types only
1713 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
1714 llvm::Type *Ty = OrigTy;
1715 if (OrigTy->isPointerTy())
1716 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
1717 llvm::Type *Types[] = { Ty };
1719 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
1720 llvm::Value *Value = Src.getScalarVal();
1721 if (OrigTy->isPointerTy())
1722 Value = Builder.CreatePtrToInt(Value, Ty);
1724 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
1727 // setObjCGCLValueClass - sets class of the lvalue for the purpose of
1728 // generating write-barries API. It is currently a global, ivar,
1730 static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
1732 bool IsMemberAccess=false) {
1733 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
1736 if (isa<ObjCIvarRefExpr>(E)) {
1737 QualType ExpTy = E->getType();
1738 if (IsMemberAccess && ExpTy->isPointerType()) {
1739 // If ivar is a structure pointer, assigning to field of
1740 // this struct follows gcc's behavior and makes it a non-ivar
1741 // writer-barrier conservatively.
1742 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
1743 if (ExpTy->isRecordType()) {
1744 LV.setObjCIvar(false);
1748 LV.setObjCIvar(true);
1749 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
1750 LV.setBaseIvarExp(Exp->getBase());
1751 LV.setObjCArray(E->getType()->isArrayType());
1755 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
1756 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
1757 if (VD->hasGlobalStorage()) {
1758 LV.setGlobalObjCRef(true);
1759 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
1762 LV.setObjCArray(E->getType()->isArrayType());
1766 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
1767 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1771 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
1772 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1773 if (LV.isObjCIvar()) {
1774 // If cast is to a structure pointer, follow gcc's behavior and make it
1775 // a non-ivar write-barrier.
1776 QualType ExpTy = E->getType();
1777 if (ExpTy->isPointerType())
1778 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
1779 if (ExpTy->isRecordType())
1780 LV.setObjCIvar(false);
1785 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
1786 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
1790 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
1791 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1795 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
1796 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1800 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
1801 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
1805 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
1806 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
1807 if (LV.isObjCIvar() && !LV.isObjCArray())
1808 // Using array syntax to assigning to what an ivar points to is not
1809 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
1810 LV.setObjCIvar(false);
1811 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
1812 // Using array syntax to assigning to what global points to is not
1813 // same as assigning to the global itself. {id *G;} G[i] = 0;
1814 LV.setGlobalObjCRef(false);
1818 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
1819 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
1820 // We don't know if member is an 'ivar', but this flag is looked at
1821 // only in the context of LV.isObjCIvar().
1822 LV.setObjCArray(E->getType()->isArrayType());
1827 static llvm::Value *
1828 EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
1829 llvm::Value *V, llvm::Type *IRType,
1830 StringRef Name = StringRef()) {
1831 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
1832 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
1835 static LValue EmitThreadPrivateVarDeclLValue(
1836 CodeGenFunction &CGF, const VarDecl *VD, QualType T, llvm::Value *V,
1837 llvm::Type *RealVarTy, CharUnits Alignment, SourceLocation Loc) {
1838 V = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, V, Loc);
1839 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
1840 return CGF.MakeAddrLValue(V, T, Alignment);
1843 static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
1844 const Expr *E, const VarDecl *VD) {
1845 QualType T = E->getType();
1847 // If it's thread_local, emit a call to its wrapper function instead.
1848 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
1849 CGF.CGM.getCXXABI().usesThreadWrapperFunction())
1850 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
1852 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
1853 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
1854 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
1855 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
1857 // Emit reference to the private copy of the variable if it is an OpenMP
1858 // threadprivate variable.
1859 if (CGF.getLangOpts().OpenMP && VD->hasAttr<OMPThreadPrivateDeclAttr>())
1860 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, V, RealVarTy, Alignment,
1862 if (VD->getType()->isReferenceType()) {
1863 llvm::LoadInst *LI = CGF.Builder.CreateLoad(V);
1864 LI->setAlignment(Alignment.getQuantity());
1866 LV = CGF.MakeNaturalAlignAddrLValue(V, T);
1868 LV = CGF.MakeAddrLValue(V, T, Alignment);
1870 setObjCGCLValueClass(CGF.getContext(), E, LV);
1874 static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
1875 const Expr *E, const FunctionDecl *FD) {
1876 llvm::Value *V = CGF.CGM.GetAddrOfFunction(FD);
1877 if (!FD->hasPrototype()) {
1878 if (const FunctionProtoType *Proto =
1879 FD->getType()->getAs<FunctionProtoType>()) {
1880 // Ugly case: for a K&R-style definition, the type of the definition
1881 // isn't the same as the type of a use. Correct for this with a
1883 QualType NoProtoType =
1884 CGF.getContext().getFunctionNoProtoType(Proto->getReturnType());
1885 NoProtoType = CGF.getContext().getPointerType(NoProtoType);
1886 V = CGF.Builder.CreateBitCast(V, CGF.ConvertType(NoProtoType));
1889 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
1890 return CGF.MakeAddrLValue(V, E->getType(), Alignment);
1893 static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
1894 llvm::Value *ThisValue) {
1895 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
1896 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
1897 return CGF.EmitLValueForField(LV, FD);
1900 /// Named Registers are named metadata pointing to the register name
1901 /// which will be read from/written to as an argument to the intrinsic
1902 /// @llvm.read/write_register.
1903 /// So far, only the name is being passed down, but other options such as
1904 /// register type, allocation type or even optimization options could be
1905 /// passed down via the metadata node.
1906 static LValue EmitGlobalNamedRegister(const VarDecl *VD,
1908 CharUnits Alignment) {
1909 SmallString<64> Name("llvm.named.register.");
1910 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
1911 assert(Asm->getLabel().size() < 64-Name.size() &&
1912 "Register name too big");
1913 Name.append(Asm->getLabel());
1914 llvm::NamedMDNode *M =
1915 CGM.getModule().getOrInsertNamedMetadata(Name);
1916 if (M->getNumOperands() == 0) {
1917 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
1919 llvm::Metadata *Ops[] = {Str};
1920 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
1922 return LValue::MakeGlobalReg(
1923 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0)),
1924 VD->getType(), Alignment);
1927 LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
1928 const NamedDecl *ND = E->getDecl();
1929 CharUnits Alignment = getContext().getDeclAlign(ND);
1930 QualType T = E->getType();
1932 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
1933 // Global Named registers access via intrinsics only
1934 if (VD->getStorageClass() == SC_Register &&
1935 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
1936 return EmitGlobalNamedRegister(VD, CGM, Alignment);
1938 // A DeclRefExpr for a reference initialized by a constant expression can
1939 // appear without being odr-used. Directly emit the constant initializer.
1940 const Expr *Init = VD->getAnyInitializer(VD);
1941 if (Init && !isa<ParmVarDecl>(VD) && VD->getType()->isReferenceType() &&
1942 VD->isUsableInConstantExpressions(getContext()) &&
1943 VD->checkInitIsICE()) {
1944 llvm::Constant *Val =
1945 CGM.EmitConstantValue(*VD->evaluateValue(), VD->getType(), this);
1946 assert(Val && "failed to emit reference constant expression");
1947 // FIXME: Eventually we will want to emit vector element references.
1948 return MakeAddrLValue(Val, T, Alignment);
1951 // Check for captured variables.
1952 if (E->refersToEnclosingVariableOrCapture()) {
1953 if (auto *FD = LambdaCaptureFields.lookup(VD))
1954 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
1955 else if (CapturedStmtInfo) {
1956 if (auto *V = LocalDeclMap.lookup(VD))
1957 return MakeAddrLValue(V, T, Alignment);
1959 return EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
1960 CapturedStmtInfo->getContextValue());
1962 assert(isa<BlockDecl>(CurCodeDecl));
1963 return MakeAddrLValue(GetAddrOfBlockDecl(VD, VD->hasAttr<BlocksAttr>()),
1968 // FIXME: We should be able to assert this for FunctionDecls as well!
1969 // FIXME: We should be able to assert this for all DeclRefExprs, not just
1970 // those with a valid source location.
1971 assert((ND->isUsed(false) || !isa<VarDecl>(ND) ||
1972 !E->getLocation().isValid()) &&
1973 "Should not use decl without marking it used!");
1975 if (ND->hasAttr<WeakRefAttr>()) {
1976 const auto *VD = cast<ValueDecl>(ND);
1977 llvm::Constant *Aliasee = CGM.GetWeakRefReference(VD);
1978 return MakeAddrLValue(Aliasee, T, Alignment);
1981 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
1982 // Check if this is a global variable.
1983 if (VD->hasLinkage() || VD->isStaticDataMember())
1984 return EmitGlobalVarDeclLValue(*this, E, VD);
1986 bool isBlockVariable = VD->hasAttr<BlocksAttr>();
1988 llvm::Value *V = LocalDeclMap.lookup(VD);
1989 if (!V && VD->isStaticLocal())
1990 V = CGM.getOrCreateStaticVarDecl(
1991 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*isConstant=*/false));
1993 // Check if variable is threadprivate.
1994 if (V && getLangOpts().OpenMP && VD->hasAttr<OMPThreadPrivateDeclAttr>())
1995 return EmitThreadPrivateVarDeclLValue(
1996 *this, VD, T, V, getTypes().ConvertTypeForMem(VD->getType()),
1997 Alignment, E->getExprLoc());
1999 assert(V && "DeclRefExpr not entered in LocalDeclMap?");
2001 if (isBlockVariable)
2002 V = BuildBlockByrefAddress(V, VD);
2005 if (VD->getType()->isReferenceType()) {
2006 llvm::LoadInst *LI = Builder.CreateLoad(V);
2007 LI->setAlignment(Alignment.getQuantity());
2009 LV = MakeNaturalAlignAddrLValue(V, T);
2011 LV = MakeAddrLValue(V, T, Alignment);
2014 bool isLocalStorage = VD->hasLocalStorage();
2016 bool NonGCable = isLocalStorage &&
2017 !VD->getType()->isReferenceType() &&
2020 LV.getQuals().removeObjCGCAttr();
2024 bool isImpreciseLifetime =
2025 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2026 if (isImpreciseLifetime)
2027 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2028 setObjCGCLValueClass(getContext(), E, LV);
2032 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2033 return EmitFunctionDeclLValue(*this, E, FD);
2035 llvm_unreachable("Unhandled DeclRefExpr");
2038 LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2039 // __extension__ doesn't affect lvalue-ness.
2040 if (E->getOpcode() == UO_Extension)
2041 return EmitLValue(E->getSubExpr());
2043 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2044 switch (E->getOpcode()) {
2045 default: llvm_unreachable("Unknown unary operator lvalue!");
2047 QualType T = E->getSubExpr()->getType()->getPointeeType();
2048 assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type");
2050 LValue LV = MakeNaturalAlignAddrLValue(EmitScalarExpr(E->getSubExpr()), T);
2051 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2053 // We should not generate __weak write barrier on indirect reference
2054 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2055 // But, we continue to generate __strong write barrier on indirect write
2056 // into a pointer to object.
2057 if (getLangOpts().ObjC1 &&
2058 getLangOpts().getGC() != LangOptions::NonGC &&
2060 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2065 LValue LV = EmitLValue(E->getSubExpr());
2066 assert(LV.isSimple() && "real/imag on non-ordinary l-value");
2067 llvm::Value *Addr = LV.getAddress();
2069 // __real is valid on scalars. This is a faster way of testing that.
2070 // __imag can only produce an rvalue on scalars.
2071 if (E->getOpcode() == UO_Real &&
2072 !cast<llvm::PointerType>(Addr->getType())
2073 ->getElementType()->isStructTy()) {
2074 assert(E->getSubExpr()->getType()->isArithmeticType());
2078 assert(E->getSubExpr()->getType()->isAnyComplexType());
2080 unsigned Idx = E->getOpcode() == UO_Imag;
2081 return MakeAddrLValue(
2082 Builder.CreateStructGEP(nullptr, LV.getAddress(), Idx, "idx"), ExprTy);
2086 LValue LV = EmitLValue(E->getSubExpr());
2087 bool isInc = E->getOpcode() == UO_PreInc;
2089 if (E->getType()->isAnyComplexType())
2090 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2092 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2098 LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2099 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2103 LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2104 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2108 LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2109 auto SL = E->getFunctionName();
2110 assert(SL != nullptr && "No StringLiteral name in PredefinedExpr");
2111 StringRef FnName = CurFn->getName();
2112 if (FnName.startswith("\01"))
2113 FnName = FnName.substr(1);
2114 StringRef NameItems[] = {
2115 PredefinedExpr::getIdentTypeName(E->getIdentType()), FnName};
2116 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2117 if (CurCodeDecl && isa<BlockDecl>(CurCodeDecl)) {
2118 auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str(), 1);
2119 return MakeAddrLValue(C, E->getType());
2121 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2122 return MakeAddrLValue(C, E->getType());
2125 /// Emit a type description suitable for use by a runtime sanitizer library. The
2126 /// format of a type descriptor is
2129 /// { i16 TypeKind, i16 TypeInfo }
2132 /// followed by an array of i8 containing the type name. TypeKind is 0 for an
2133 /// integer, 1 for a floating point value, and -1 for anything else.
2134 llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2135 // Only emit each type's descriptor once.
2136 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2139 uint16_t TypeKind = -1;
2140 uint16_t TypeInfo = 0;
2142 if (T->isIntegerType()) {
2144 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2145 (T->isSignedIntegerType() ? 1 : 0);
2146 } else if (T->isFloatingType()) {
2148 TypeInfo = getContext().getTypeSize(T);
2151 // Format the type name as if for a diagnostic, including quotes and
2152 // optionally an 'aka'.
2153 SmallString<32> Buffer;
2154 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2155 (intptr_t)T.getAsOpaquePtr(),
2156 StringRef(), StringRef(), None, Buffer,
2159 llvm::Constant *Components[] = {
2160 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2161 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2163 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2165 auto *GV = new llvm::GlobalVariable(
2166 CGM.getModule(), Descriptor->getType(),
2167 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2168 GV->setUnnamedAddr(true);
2169 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2171 // Remember the descriptor for this type.
2172 CGM.setTypeDescriptorInMap(T, GV);
2177 llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2178 llvm::Type *TargetTy = IntPtrTy;
2180 // Floating-point types which fit into intptr_t are bitcast to integers
2181 // and then passed directly (after zero-extension, if necessary).
2182 if (V->getType()->isFloatingPointTy()) {
2183 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2184 if (Bits <= TargetTy->getIntegerBitWidth())
2185 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2189 // Integers which fit in intptr_t are zero-extended and passed directly.
2190 if (V->getType()->isIntegerTy() &&
2191 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2192 return Builder.CreateZExt(V, TargetTy);
2194 // Pointers are passed directly, everything else is passed by address.
2195 if (!V->getType()->isPointerTy()) {
2196 llvm::Value *Ptr = CreateTempAlloca(V->getType());
2197 Builder.CreateStore(V, Ptr);
2200 return Builder.CreatePtrToInt(V, TargetTy);
2203 /// \brief Emit a representation of a SourceLocation for passing to a handler
2204 /// in a sanitizer runtime library. The format for this data is:
2206 /// struct SourceLocation {
2207 /// const char *Filename;
2208 /// int32_t Line, Column;
2211 /// For an invalid SourceLocation, the Filename pointer is null.
2212 llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
2213 llvm::Constant *Filename;
2216 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
2217 if (PLoc.isValid()) {
2218 auto FilenameGV = CGM.GetAddrOfConstantCString(PLoc.getFilename(), ".src");
2219 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(FilenameGV);
2220 Filename = FilenameGV;
2221 Line = PLoc.getLine();
2222 Column = PLoc.getColumn();
2224 Filename = llvm::Constant::getNullValue(Int8PtrTy);
2228 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
2229 Builder.getInt32(Column)};
2231 return llvm::ConstantStruct::getAnon(Data);
2235 /// \brief Specify under what conditions this check can be recovered
2236 enum class CheckRecoverableKind {
2237 /// Always terminate program execution if this check fails.
2239 /// Check supports recovering, runtime has both fatal (noreturn) and
2240 /// non-fatal handlers for this check.
2242 /// Runtime conditionally aborts, always need to support recovery.
2247 static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
2248 assert(llvm::countPopulation(Kind) == 1);
2250 case SanitizerKind::Vptr:
2251 return CheckRecoverableKind::AlwaysRecoverable;
2252 case SanitizerKind::Return:
2253 case SanitizerKind::Unreachable:
2254 return CheckRecoverableKind::Unrecoverable;
2256 return CheckRecoverableKind::Recoverable;
2260 static void emitCheckHandlerCall(CodeGenFunction &CGF,
2261 llvm::FunctionType *FnType,
2262 ArrayRef<llvm::Value *> FnArgs,
2263 StringRef CheckName,
2264 CheckRecoverableKind RecoverKind, bool IsFatal,
2265 llvm::BasicBlock *ContBB) {
2266 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable);
2267 bool NeedsAbortSuffix =
2268 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
2269 std::string FnName = ("__ubsan_handle_" + CheckName +
2270 (NeedsAbortSuffix ? "_abort" : "")).str();
2272 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
2274 llvm::AttrBuilder B;
2276 B.addAttribute(llvm::Attribute::NoReturn)
2277 .addAttribute(llvm::Attribute::NoUnwind);
2279 B.addAttribute(llvm::Attribute::UWTable);
2281 llvm::Value *Fn = CGF.CGM.CreateRuntimeFunction(
2283 llvm::AttributeSet::get(CGF.getLLVMContext(),
2284 llvm::AttributeSet::FunctionIndex, B));
2285 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
2287 HandlerCall->setDoesNotReturn();
2288 CGF.Builder.CreateUnreachable();
2290 CGF.Builder.CreateBr(ContBB);
2294 void CodeGenFunction::EmitCheck(
2295 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
2296 StringRef CheckName, ArrayRef<llvm::Constant *> StaticArgs,
2297 ArrayRef<llvm::Value *> DynamicArgs) {
2298 assert(IsSanitizerScope);
2299 assert(Checked.size() > 0);
2301 llvm::Value *FatalCond = nullptr;
2302 llvm::Value *RecoverableCond = nullptr;
2303 for (int i = 0, n = Checked.size(); i < n; ++i) {
2304 llvm::Value *Check = Checked[i].first;
2305 llvm::Value *&Cond =
2306 CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
2309 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
2312 llvm::Value *JointCond;
2313 if (FatalCond && RecoverableCond)
2314 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
2316 JointCond = FatalCond ? FatalCond : RecoverableCond;
2319 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
2320 assert(SanOpts.has(Checked[0].second));
2322 for (int i = 1, n = Checked.size(); i < n; ++i) {
2323 assert(RecoverKind == getRecoverableKind(Checked[i].second) &&
2324 "All recoverable kinds in a single check must be same!");
2325 assert(SanOpts.has(Checked[i].second));
2329 if (CGM.getCodeGenOpts().SanitizeUndefinedTrapOnError) {
2330 assert(RecoverKind != CheckRecoverableKind::AlwaysRecoverable &&
2331 "Runtime call required for AlwaysRecoverable kind!");
2332 // Assume that -fsanitize-undefined-trap-on-error overrides
2333 // -fsanitize-recover= options, as we can only print meaningful error
2334 // message and recover if we have a runtime support.
2335 return EmitTrapCheck(JointCond);
2338 llvm::BasicBlock *Cont = createBasicBlock("cont");
2339 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
2340 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
2341 // Give hint that we very much don't expect to execute the handler
2342 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
2343 llvm::MDBuilder MDHelper(getLLVMContext());
2344 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
2345 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
2346 EmitBlock(Handlers);
2348 // Emit handler arguments and create handler function type.
2349 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
2351 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
2352 llvm::GlobalVariable::PrivateLinkage, Info);
2353 InfoPtr->setUnnamedAddr(true);
2354 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
2356 SmallVector<llvm::Value *, 4> Args;
2357 SmallVector<llvm::Type *, 4> ArgTypes;
2358 Args.reserve(DynamicArgs.size() + 1);
2359 ArgTypes.reserve(DynamicArgs.size() + 1);
2361 // Handler functions take an i8* pointing to the (handler-specific) static
2362 // information block, followed by a sequence of intptr_t arguments
2363 // representing operand values.
2364 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
2365 ArgTypes.push_back(Int8PtrTy);
2366 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
2367 Args.push_back(EmitCheckValue(DynamicArgs[i]));
2368 ArgTypes.push_back(IntPtrTy);
2371 llvm::FunctionType *FnType =
2372 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
2374 if (!FatalCond || !RecoverableCond) {
2375 // Simple case: we need to generate a single handler call, either
2376 // fatal, or non-fatal.
2377 emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind,
2378 (FatalCond != nullptr), Cont);
2380 // Emit two handler calls: first one for set of unrecoverable checks,
2381 // another one for recoverable.
2382 llvm::BasicBlock *NonFatalHandlerBB =
2383 createBasicBlock("non_fatal." + CheckName);
2384 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
2385 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
2386 EmitBlock(FatalHandlerBB);
2387 emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind, true,
2389 EmitBlock(NonFatalHandlerBB);
2390 emitCheckHandlerCall(*this, FnType, Args, CheckName, RecoverKind, false,
2397 void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
2398 llvm::BasicBlock *Cont = createBasicBlock("cont");
2400 // If we're optimizing, collapse all calls to trap down to just one per
2401 // function to save on code size.
2402 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
2403 TrapBB = createBasicBlock("trap");
2404 Builder.CreateCondBr(Checked, Cont, TrapBB);
2406 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::trap);
2407 llvm::CallInst *TrapCall = Builder.CreateCall(F, {});
2408 TrapCall->setDoesNotReturn();
2409 TrapCall->setDoesNotThrow();
2410 Builder.CreateUnreachable();
2412 Builder.CreateCondBr(Checked, Cont, TrapBB);
2418 /// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
2419 /// array to pointer, return the array subexpression.
2420 static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
2421 // If this isn't just an array->pointer decay, bail out.
2422 const auto *CE = dyn_cast<CastExpr>(E);
2423 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
2426 // If this is a decay from variable width array, bail out.
2427 const Expr *SubExpr = CE->getSubExpr();
2428 if (SubExpr->getType()->isVariableArrayType())
2434 LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
2436 // The index must always be an integer, which is not an aggregate. Emit it.
2437 llvm::Value *Idx = EmitScalarExpr(E->getIdx());
2438 QualType IdxTy = E->getIdx()->getType();
2439 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
2441 if (SanOpts.has(SanitizerKind::ArrayBounds))
2442 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
2444 // If the base is a vector type, then we are forming a vector element lvalue
2445 // with this subscript.
2446 if (E->getBase()->getType()->isVectorType() &&
2447 !isa<ExtVectorElementExpr>(E->getBase())) {
2448 // Emit the vector as an lvalue to get its address.
2449 LValue LHS = EmitLValue(E->getBase());
2450 assert(LHS.isSimple() && "Can only subscript lvalue vectors here!");
2451 return LValue::MakeVectorElt(LHS.getAddress(), Idx,
2452 E->getBase()->getType(), LHS.getAlignment());
2455 // Extend or truncate the index type to 32 or 64-bits.
2456 if (Idx->getType() != IntPtrTy)
2457 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
2459 // We know that the pointer points to a type of the correct size, unless the
2460 // size is a VLA or Objective-C interface.
2461 llvm::Value *Address = nullptr;
2462 CharUnits ArrayAlignment;
2463 if (isa<ExtVectorElementExpr>(E->getBase())) {
2464 LValue LV = EmitLValue(E->getBase());
2465 Address = EmitExtVectorElementLValue(LV);
2466 Address = Builder.CreateInBoundsGEP(Address, Idx, "arrayidx");
2467 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
2468 QualType EQT = ExprVT->getElementType();
2469 return MakeAddrLValue(Address, EQT,
2470 getContext().getTypeAlignInChars(EQT));
2472 else if (const VariableArrayType *vla =
2473 getContext().getAsVariableArrayType(E->getType())) {
2474 // The base must be a pointer, which is not an aggregate. Emit
2475 // it. It needs to be emitted first in case it's what captures
2477 Address = EmitScalarExpr(E->getBase());
2479 // The element count here is the total number of non-VLA elements.
2480 llvm::Value *numElements = getVLASize(vla).first;
2482 // Effectively, the multiply by the VLA size is part of the GEP.
2483 // GEP indexes are signed, and scaling an index isn't permitted to
2484 // signed-overflow, so we use the same semantics for our explicit
2485 // multiply. We suppress this if overflow is not undefined behavior.
2486 if (getLangOpts().isSignedOverflowDefined()) {
2487 Idx = Builder.CreateMul(Idx, numElements);
2488 Address = Builder.CreateGEP(Address, Idx, "arrayidx");
2490 Idx = Builder.CreateNSWMul(Idx, numElements);
2491 Address = Builder.CreateInBoundsGEP(Address, Idx, "arrayidx");
2493 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
2494 // Indexing over an interface, as in "NSString *P; P[4];"
2495 llvm::Value *InterfaceSize =
2496 llvm::ConstantInt::get(Idx->getType(),
2497 getContext().getTypeSizeInChars(OIT).getQuantity());
2499 Idx = Builder.CreateMul(Idx, InterfaceSize);
2501 // The base must be a pointer, which is not an aggregate. Emit it.
2502 llvm::Value *Base = EmitScalarExpr(E->getBase());
2503 Address = EmitCastToVoidPtr(Base);
2504 Address = Builder.CreateGEP(Address, Idx, "arrayidx");
2505 Address = Builder.CreateBitCast(Address, Base->getType());
2506 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
2507 // If this is A[i] where A is an array, the frontend will have decayed the
2508 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
2509 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
2510 // "gep x, i" here. Emit one "gep A, 0, i".
2511 assert(Array->getType()->isArrayType() &&
2512 "Array to pointer decay must have array source type!");
2514 // For simple multidimensional array indexing, set the 'accessed' flag for
2515 // better bounds-checking of the base expression.
2516 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
2517 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
2519 ArrayLV = EmitLValue(Array);
2520 llvm::Value *ArrayPtr = ArrayLV.getAddress();
2521 llvm::Value *Zero = llvm::ConstantInt::get(Int32Ty, 0);
2522 llvm::Value *Args[] = { Zero, Idx };
2524 // Propagate the alignment from the array itself to the result.
2525 ArrayAlignment = ArrayLV.getAlignment();
2527 if (getLangOpts().isSignedOverflowDefined())
2528 Address = Builder.CreateGEP(ArrayPtr, Args, "arrayidx");
2530 Address = Builder.CreateInBoundsGEP(ArrayPtr, Args, "arrayidx");
2532 // The base must be a pointer, which is not an aggregate. Emit it.
2533 llvm::Value *Base = EmitScalarExpr(E->getBase());
2534 if (getLangOpts().isSignedOverflowDefined())
2535 Address = Builder.CreateGEP(Base, Idx, "arrayidx");
2537 Address = Builder.CreateInBoundsGEP(Base, Idx, "arrayidx");
2540 QualType T = E->getBase()->getType()->getPointeeType();
2541 assert(!T.isNull() &&
2542 "CodeGenFunction::EmitArraySubscriptExpr(): Illegal base type");
2545 // Limit the alignment to that of the result type.
2547 if (!ArrayAlignment.isZero()) {
2548 CharUnits Align = getContext().getTypeAlignInChars(T);
2549 ArrayAlignment = std::min(Align, ArrayAlignment);
2550 LV = MakeAddrLValue(Address, T, ArrayAlignment);
2552 LV = MakeNaturalAlignAddrLValue(Address, T);
2555 LV.getQuals().setAddressSpace(E->getBase()->getType().getAddressSpace());
2557 if (getLangOpts().ObjC1 &&
2558 getLangOpts().getGC() != LangOptions::NonGC) {
2559 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2560 setObjCGCLValueClass(getContext(), E, LV);
2566 llvm::Constant *GenerateConstantVector(CGBuilderTy &Builder,
2567 SmallVectorImpl<unsigned> &Elts) {
2568 SmallVector<llvm::Constant*, 4> CElts;
2569 for (unsigned i = 0, e = Elts.size(); i != e; ++i)
2570 CElts.push_back(Builder.getInt32(Elts[i]));
2572 return llvm::ConstantVector::get(CElts);
2575 LValue CodeGenFunction::
2576 EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
2577 // Emit the base vector as an l-value.
2580 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
2582 // If it is a pointer to a vector, emit the address and form an lvalue with
2584 llvm::Value *Ptr = EmitScalarExpr(E->getBase());
2585 const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
2586 Base = MakeAddrLValue(Ptr, PT->getPointeeType());
2587 Base.getQuals().removeObjCGCAttr();
2588 } else if (E->getBase()->isGLValue()) {
2589 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
2590 // emit the base as an lvalue.
2591 assert(E->getBase()->getType()->isVectorType());
2592 Base = EmitLValue(E->getBase());
2594 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
2595 assert(E->getBase()->getType()->isVectorType() &&
2596 "Result must be a vector");
2597 llvm::Value *Vec = EmitScalarExpr(E->getBase());
2599 // Store the vector to memory (because LValue wants an address).
2600 llvm::Value *VecMem = CreateMemTemp(E->getBase()->getType());
2601 Builder.CreateStore(Vec, VecMem);
2602 Base = MakeAddrLValue(VecMem, E->getBase()->getType());
2606 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
2608 // Encode the element access list into a vector of unsigned indices.
2609 SmallVector<unsigned, 4> Indices;
2610 E->getEncodedElementAccess(Indices);
2612 if (Base.isSimple()) {
2613 llvm::Constant *CV = GenerateConstantVector(Builder, Indices);
2614 return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
2615 Base.getAlignment());
2617 assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!");
2619 llvm::Constant *BaseElts = Base.getExtVectorElts();
2620 SmallVector<llvm::Constant *, 4> CElts;
2622 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
2623 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
2624 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
2625 return LValue::MakeExtVectorElt(Base.getExtVectorAddr(), CV, type,
2626 Base.getAlignment());
2629 LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
2630 Expr *BaseExpr = E->getBase();
2632 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
2635 llvm::Value *Ptr = EmitScalarExpr(BaseExpr);
2636 QualType PtrTy = BaseExpr->getType()->getPointeeType();
2637 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Ptr, PtrTy);
2638 BaseLV = MakeNaturalAlignAddrLValue(Ptr, PtrTy);
2640 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
2642 NamedDecl *ND = E->getMemberDecl();
2643 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
2644 LValue LV = EmitLValueForField(BaseLV, Field);
2645 setObjCGCLValueClass(getContext(), E, LV);
2649 if (auto *VD = dyn_cast<VarDecl>(ND))
2650 return EmitGlobalVarDeclLValue(*this, E, VD);
2652 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2653 return EmitFunctionDeclLValue(*this, E, FD);
2655 llvm_unreachable("Unhandled member declaration!");
2658 /// Given that we are currently emitting a lambda, emit an l-value for
2659 /// one of its members.
2660 LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
2661 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda());
2662 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent());
2663 QualType LambdaTagType =
2664 getContext().getTagDeclType(Field->getParent());
2665 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
2666 return EmitLValueForField(LambdaLV, Field);
2669 LValue CodeGenFunction::EmitLValueForField(LValue base,
2670 const FieldDecl *field) {
2671 if (field->isBitField()) {
2672 const CGRecordLayout &RL =
2673 CGM.getTypes().getCGRecordLayout(field->getParent());
2674 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
2675 llvm::Value *Addr = base.getAddress();
2676 unsigned Idx = RL.getLLVMFieldNo(field);
2678 // For structs, we GEP to the field that the record layout suggests.
2679 Addr = Builder.CreateStructGEP(nullptr, Addr, Idx, field->getName());
2680 // Get the access type.
2681 llvm::Type *PtrTy = llvm::Type::getIntNPtrTy(
2682 getLLVMContext(), Info.StorageSize,
2683 CGM.getContext().getTargetAddressSpace(base.getType()));
2684 if (Addr->getType() != PtrTy)
2685 Addr = Builder.CreateBitCast(Addr, PtrTy);
2687 QualType fieldType =
2688 field->getType().withCVRQualifiers(base.getVRQualifiers());
2689 return LValue::MakeBitfield(Addr, Info, fieldType, base.getAlignment());
2692 const RecordDecl *rec = field->getParent();
2693 QualType type = field->getType();
2694 CharUnits alignment = getContext().getDeclAlign(field);
2696 // FIXME: It should be impossible to have an LValue without alignment for a
2698 if (!base.getAlignment().isZero())
2699 alignment = std::min(alignment, base.getAlignment());
2701 bool mayAlias = rec->hasAttr<MayAliasAttr>();
2703 llvm::Value *addr = base.getAddress();
2704 unsigned cvr = base.getVRQualifiers();
2705 bool TBAAPath = CGM.getCodeGenOpts().StructPathTBAA;
2706 if (rec->isUnion()) {
2707 // For unions, there is no pointer adjustment.
2708 assert(!type->isReferenceType() && "union has reference member");
2709 // TODO: handle path-aware TBAA for union.
2712 // For structs, we GEP to the field that the record layout suggests.
2713 unsigned idx = CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
2714 addr = Builder.CreateStructGEP(nullptr, addr, idx, field->getName());
2716 // If this is a reference field, load the reference right now.
2717 if (const ReferenceType *refType = type->getAs<ReferenceType>()) {
2718 llvm::LoadInst *load = Builder.CreateLoad(addr, "ref");
2719 if (cvr & Qualifiers::Volatile) load->setVolatile(true);
2720 load->setAlignment(alignment.getQuantity());
2722 // Loading the reference will disable path-aware TBAA.
2724 if (CGM.shouldUseTBAA()) {
2727 tbaa = CGM.getTBAAInfo(getContext().CharTy);
2729 tbaa = CGM.getTBAAInfo(type);
2731 CGM.DecorateInstruction(load, tbaa);
2736 type = refType->getPointeeType();
2737 if (type->isIncompleteType())
2738 alignment = CharUnits();
2740 alignment = getContext().getTypeAlignInChars(type);
2741 cvr = 0; // qualifiers don't recursively apply to referencee
2745 // Make sure that the address is pointing to the right type. This is critical
2746 // for both unions and structs. A union needs a bitcast, a struct element
2747 // will need a bitcast if the LLVM type laid out doesn't match the desired
2749 addr = EmitBitCastOfLValueToProperType(*this, addr,
2750 CGM.getTypes().ConvertTypeForMem(type),
2753 if (field->hasAttr<AnnotateAttr>())
2754 addr = EmitFieldAnnotations(field, addr);
2756 LValue LV = MakeAddrLValue(addr, type, alignment);
2757 LV.getQuals().addCVRQualifiers(cvr);
2759 const ASTRecordLayout &Layout =
2760 getContext().getASTRecordLayout(field->getParent());
2761 // Set the base type to be the base type of the base LValue and
2762 // update offset to be relative to the base type.
2763 LV.setTBAABaseType(mayAlias ? getContext().CharTy : base.getTBAABaseType());
2764 LV.setTBAAOffset(mayAlias ? 0 : base.getTBAAOffset() +
2765 Layout.getFieldOffset(field->getFieldIndex()) /
2766 getContext().getCharWidth());
2769 // __weak attribute on a field is ignored.
2770 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
2771 LV.getQuals().removeObjCGCAttr();
2773 // Fields of may_alias structs act like 'char' for TBAA purposes.
2774 // FIXME: this should get propagated down through anonymous structs
2776 if (mayAlias && LV.getTBAAInfo())
2777 LV.setTBAAInfo(CGM.getTBAAInfo(getContext().CharTy));
2783 CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
2784 const FieldDecl *Field) {
2785 QualType FieldType = Field->getType();
2787 if (!FieldType->isReferenceType())
2788 return EmitLValueForField(Base, Field);
2790 const CGRecordLayout &RL =
2791 CGM.getTypes().getCGRecordLayout(Field->getParent());
2792 unsigned idx = RL.getLLVMFieldNo(Field);
2793 llvm::Value *V = Builder.CreateStructGEP(nullptr, Base.getAddress(), idx);
2794 assert(!FieldType.getObjCGCAttr() && "fields cannot have GC attrs");
2796 // Make sure that the address is pointing to the right type. This is critical
2797 // for both unions and structs. A union needs a bitcast, a struct element
2798 // will need a bitcast if the LLVM type laid out doesn't match the desired
2800 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
2801 V = EmitBitCastOfLValueToProperType(*this, V, llvmType, Field->getName());
2803 CharUnits Alignment = getContext().getDeclAlign(Field);
2805 // FIXME: It should be impossible to have an LValue without alignment for a
2807 if (!Base.getAlignment().isZero())
2808 Alignment = std::min(Alignment, Base.getAlignment());
2810 return MakeAddrLValue(V, FieldType, Alignment);
2813 LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
2814 if (E->isFileScope()) {
2815 llvm::Value *GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
2816 return MakeAddrLValue(GlobalPtr, E->getType());
2818 if (E->getType()->isVariablyModifiedType())
2819 // make sure to emit the VLA size.
2820 EmitVariablyModifiedType(E->getType());
2822 llvm::Value *DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
2823 const Expr *InitExpr = E->getInitializer();
2824 LValue Result = MakeAddrLValue(DeclPtr, E->getType());
2826 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
2832 LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
2833 if (!E->isGLValue())
2834 // Initializing an aggregate temporary in C++11: T{...}.
2835 return EmitAggExprToLValue(E);
2837 // An lvalue initializer list must be initializing a reference.
2838 assert(E->getNumInits() == 1 && "reference init with multiple values");
2839 return EmitLValue(E->getInit(0));
2842 /// Emit the operand of a glvalue conditional operator. This is either a glvalue
2843 /// or a (possibly-parenthesized) throw-expression. If this is a throw, no
2844 /// LValue is returned and the current block has been terminated.
2845 static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
2846 const Expr *Operand) {
2847 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
2848 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
2852 return CGF.EmitLValue(Operand);
2855 LValue CodeGenFunction::
2856 EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
2857 if (!expr->isGLValue()) {
2858 // ?: here should be an aggregate.
2859 assert(hasAggregateEvaluationKind(expr->getType()) &&
2860 "Unexpected conditional operator!");
2861 return EmitAggExprToLValue(expr);
2864 OpaqueValueMapping binding(*this, expr);
2866 const Expr *condExpr = expr->getCond();
2868 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
2869 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
2870 if (!CondExprBool) std::swap(live, dead);
2872 if (!ContainsLabel(dead)) {
2873 // If the true case is live, we need to track its region.
2875 incrementProfileCounter(expr);
2876 return EmitLValue(live);
2880 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
2881 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
2882 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
2884 ConditionalEvaluation eval(*this);
2885 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
2887 // Any temporaries created here are conditional.
2888 EmitBlock(lhsBlock);
2889 incrementProfileCounter(expr);
2891 Optional<LValue> lhs =
2892 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
2895 if (lhs && !lhs->isSimple())
2896 return EmitUnsupportedLValue(expr, "conditional operator");
2898 lhsBlock = Builder.GetInsertBlock();
2900 Builder.CreateBr(contBlock);
2902 // Any temporaries created here are conditional.
2903 EmitBlock(rhsBlock);
2905 Optional<LValue> rhs =
2906 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
2908 if (rhs && !rhs->isSimple())
2909 return EmitUnsupportedLValue(expr, "conditional operator");
2910 rhsBlock = Builder.GetInsertBlock();
2912 EmitBlock(contBlock);
2915 llvm::PHINode *phi = Builder.CreatePHI(lhs->getAddress()->getType(),
2917 phi->addIncoming(lhs->getAddress(), lhsBlock);
2918 phi->addIncoming(rhs->getAddress(), rhsBlock);
2919 return MakeAddrLValue(phi, expr->getType());
2921 assert((lhs || rhs) &&
2922 "both operands of glvalue conditional are throw-expressions?");
2923 return lhs ? *lhs : *rhs;
2927 /// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
2928 /// type. If the cast is to a reference, we can have the usual lvalue result,
2929 /// otherwise if a cast is needed by the code generator in an lvalue context,
2930 /// then it must mean that we need the address of an aggregate in order to
2931 /// access one of its members. This can happen for all the reasons that casts
2932 /// are permitted with aggregate result, including noop aggregate casts, and
2933 /// cast from scalar to union.
2934 LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
2935 switch (E->getCastKind()) {
2938 case CK_ArrayToPointerDecay:
2939 case CK_FunctionToPointerDecay:
2940 case CK_NullToMemberPointer:
2941 case CK_NullToPointer:
2942 case CK_IntegralToPointer:
2943 case CK_PointerToIntegral:
2944 case CK_PointerToBoolean:
2945 case CK_VectorSplat:
2946 case CK_IntegralCast:
2947 case CK_IntegralToBoolean:
2948 case CK_IntegralToFloating:
2949 case CK_FloatingToIntegral:
2950 case CK_FloatingToBoolean:
2951 case CK_FloatingCast:
2952 case CK_FloatingRealToComplex:
2953 case CK_FloatingComplexToReal:
2954 case CK_FloatingComplexToBoolean:
2955 case CK_FloatingComplexCast:
2956 case CK_FloatingComplexToIntegralComplex:
2957 case CK_IntegralRealToComplex:
2958 case CK_IntegralComplexToReal:
2959 case CK_IntegralComplexToBoolean:
2960 case CK_IntegralComplexCast:
2961 case CK_IntegralComplexToFloatingComplex:
2962 case CK_DerivedToBaseMemberPointer:
2963 case CK_BaseToDerivedMemberPointer:
2964 case CK_MemberPointerToBoolean:
2965 case CK_ReinterpretMemberPointer:
2966 case CK_AnyPointerToBlockPointerCast:
2967 case CK_ARCProduceObject:
2968 case CK_ARCConsumeObject:
2969 case CK_ARCReclaimReturnedObject:
2970 case CK_ARCExtendBlockObject:
2971 case CK_CopyAndAutoreleaseBlockObject:
2972 case CK_AddressSpaceConversion:
2973 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
2976 llvm_unreachable("dependent cast kind in IR gen!");
2978 case CK_BuiltinFnToFnPtr:
2979 llvm_unreachable("builtin functions are handled elsewhere");
2981 // These are never l-values; just use the aggregate emission code.
2982 case CK_NonAtomicToAtomic:
2983 case CK_AtomicToNonAtomic:
2984 return EmitAggExprToLValue(E);
2987 LValue LV = EmitLValue(E->getSubExpr());
2988 llvm::Value *V = LV.getAddress();
2989 const auto *DCE = cast<CXXDynamicCastExpr>(E);
2990 return MakeAddrLValue(EmitDynamicCast(V, DCE), E->getType());
2993 case CK_ConstructorConversion:
2994 case CK_UserDefinedConversion:
2995 case CK_CPointerToObjCPointerCast:
2996 case CK_BlockPointerToObjCPointerCast:
2998 case CK_LValueToRValue:
2999 return EmitLValue(E->getSubExpr());
3001 case CK_UncheckedDerivedToBase:
3002 case CK_DerivedToBase: {
3003 const RecordType *DerivedClassTy =
3004 E->getSubExpr()->getType()->getAs<RecordType>();
3005 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
3007 LValue LV = EmitLValue(E->getSubExpr());
3008 llvm::Value *This = LV.getAddress();
3010 // Perform the derived-to-base conversion
3011 llvm::Value *Base = GetAddressOfBaseClass(
3012 This, DerivedClassDecl, E->path_begin(), E->path_end(),
3013 /*NullCheckValue=*/false, E->getExprLoc());
3015 return MakeAddrLValue(Base, E->getType());
3018 return EmitAggExprToLValue(E);
3019 case CK_BaseToDerived: {
3020 const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
3021 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
3023 LValue LV = EmitLValue(E->getSubExpr());
3025 // Perform the base-to-derived conversion
3026 llvm::Value *Derived =
3027 GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
3028 E->path_begin(), E->path_end(),
3029 /*NullCheckValue=*/false);
3031 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
3032 // performed and the object is not of the derived type.
3033 if (sanitizePerformTypeCheck())
3034 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
3035 Derived, E->getType());
3037 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
3038 EmitVTablePtrCheckForCast(E->getType(), Derived, /*MayBeNull=*/false);
3040 return MakeAddrLValue(Derived, E->getType());
3042 case CK_LValueBitCast: {
3043 // This must be a reinterpret_cast (or c-style equivalent).
3044 const auto *CE = cast<ExplicitCastExpr>(E);
3046 LValue LV = EmitLValue(E->getSubExpr());
3047 llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
3048 ConvertType(CE->getTypeAsWritten()));
3050 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
3051 EmitVTablePtrCheckForCast(E->getType(), V, /*MayBeNull=*/false);
3053 return MakeAddrLValue(V, E->getType());
3055 case CK_ObjCObjectLValueCast: {
3056 LValue LV = EmitLValue(E->getSubExpr());
3057 QualType ToType = getContext().getLValueReferenceType(E->getType());
3058 llvm::Value *V = Builder.CreateBitCast(LV.getAddress(),
3059 ConvertType(ToType));
3060 return MakeAddrLValue(V, E->getType());
3062 case CK_ZeroToOCLEvent:
3063 llvm_unreachable("NULL to OpenCL event lvalue cast is not valid");
3066 llvm_unreachable("Unhandled lvalue cast kind?");
3069 LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
3070 assert(OpaqueValueMappingData::shouldBindAsLValue(e));
3071 return getOpaqueLValueMapping(e);
3074 RValue CodeGenFunction::EmitRValueForField(LValue LV,
3075 const FieldDecl *FD,
3076 SourceLocation Loc) {
3077 QualType FT = FD->getType();
3078 LValue FieldLV = EmitLValueForField(LV, FD);
3079 switch (getEvaluationKind(FT)) {
3081 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
3083 return FieldLV.asAggregateRValue();
3085 return EmitLoadOfLValue(FieldLV, Loc);
3087 llvm_unreachable("bad evaluation kind");
3090 //===--------------------------------------------------------------------===//
3091 // Expression Emission
3092 //===--------------------------------------------------------------------===//
3094 RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
3095 ReturnValueSlot ReturnValue) {
3096 // Builtins never have block type.
3097 if (E->getCallee()->getType()->isBlockPointerType())
3098 return EmitBlockCallExpr(E, ReturnValue);
3100 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
3101 return EmitCXXMemberCallExpr(CE, ReturnValue);
3103 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
3104 return EmitCUDAKernelCallExpr(CE, ReturnValue);
3106 const Decl *TargetDecl = E->getCalleeDecl();
3107 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl)) {
3108 if (unsigned builtinID = FD->getBuiltinID())
3109 return EmitBuiltinExpr(FD, builtinID, E, ReturnValue);
3112 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
3113 if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(TargetDecl))
3114 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
3116 if (const auto *PseudoDtor =
3117 dyn_cast<CXXPseudoDestructorExpr>(E->getCallee()->IgnoreParens())) {
3118 QualType DestroyedType = PseudoDtor->getDestroyedType();
3119 if (getLangOpts().ObjCAutoRefCount &&
3120 DestroyedType->isObjCLifetimeType() &&
3121 (DestroyedType.getObjCLifetime() == Qualifiers::OCL_Strong ||
3122 DestroyedType.getObjCLifetime() == Qualifiers::OCL_Weak)) {
3123 // Automatic Reference Counting:
3124 // If the pseudo-expression names a retainable object with weak or
3125 // strong lifetime, the object shall be released.
3126 Expr *BaseExpr = PseudoDtor->getBase();
3127 llvm::Value *BaseValue = nullptr;
3128 Qualifiers BaseQuals;
3130 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
3131 if (PseudoDtor->isArrow()) {
3132 BaseValue = EmitScalarExpr(BaseExpr);
3133 const PointerType *PTy = BaseExpr->getType()->getAs<PointerType>();
3134 BaseQuals = PTy->getPointeeType().getQualifiers();
3136 LValue BaseLV = EmitLValue(BaseExpr);
3137 BaseValue = BaseLV.getAddress();
3138 QualType BaseTy = BaseExpr->getType();
3139 BaseQuals = BaseTy.getQualifiers();
3142 switch (PseudoDtor->getDestroyedType().getObjCLifetime()) {
3143 case Qualifiers::OCL_None:
3144 case Qualifiers::OCL_ExplicitNone:
3145 case Qualifiers::OCL_Autoreleasing:
3148 case Qualifiers::OCL_Strong:
3149 EmitARCRelease(Builder.CreateLoad(BaseValue,
3150 PseudoDtor->getDestroyedType().isVolatileQualified()),
3151 ARCPreciseLifetime);
3154 case Qualifiers::OCL_Weak:
3155 EmitARCDestroyWeak(BaseValue);
3159 // C++ [expr.pseudo]p1:
3160 // The result shall only be used as the operand for the function call
3161 // operator (), and the result of such a call has type void. The only
3162 // effect is the evaluation of the postfix-expression before the dot or
3164 EmitScalarExpr(E->getCallee());
3167 return RValue::get(nullptr);
3170 llvm::Value *Callee = EmitScalarExpr(E->getCallee());
3171 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue,
3175 LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
3176 // Comma expressions just emit their LHS then their RHS as an l-value.
3177 if (E->getOpcode() == BO_Comma) {
3178 EmitIgnoredExpr(E->getLHS());
3179 EnsureInsertPoint();
3180 return EmitLValue(E->getRHS());
3183 if (E->getOpcode() == BO_PtrMemD ||
3184 E->getOpcode() == BO_PtrMemI)
3185 return EmitPointerToDataMemberBinaryExpr(E);
3187 assert(E->getOpcode() == BO_Assign && "unexpected binary l-value");
3189 // Note that in all of these cases, __block variables need the RHS
3190 // evaluated first just in case the variable gets moved by the RHS.
3192 switch (getEvaluationKind(E->getType())) {
3194 switch (E->getLHS()->getType().getObjCLifetime()) {
3195 case Qualifiers::OCL_Strong:
3196 return EmitARCStoreStrong(E, /*ignored*/ false).first;
3198 case Qualifiers::OCL_Autoreleasing:
3199 return EmitARCStoreAutoreleasing(E).first;
3201 // No reason to do any of these differently.
3202 case Qualifiers::OCL_None:
3203 case Qualifiers::OCL_ExplicitNone:
3204 case Qualifiers::OCL_Weak:
3208 RValue RV = EmitAnyExpr(E->getRHS());
3209 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
3210 EmitStoreThroughLValue(RV, LV);
3215 return EmitComplexAssignmentLValue(E);
3218 return EmitAggExprToLValue(E);
3220 llvm_unreachable("bad evaluation kind");
3223 LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
3224 RValue RV = EmitCallExpr(E);
3227 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3229 assert(E->getCallReturnType(getContext())->isReferenceType() &&
3230 "Can't have a scalar return unless the return type is a "
3233 return MakeAddrLValue(RV.getScalarVal(), E->getType());
3236 LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
3237 // FIXME: This shouldn't require another copy.
3238 return EmitAggExprToLValue(E);
3241 LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
3242 assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()
3243 && "binding l-value to type which needs a temporary");
3244 AggValueSlot Slot = CreateAggTemp(E->getType());
3245 EmitCXXConstructExpr(E, Slot);
3246 return MakeAddrLValue(Slot.getAddr(), E->getType());
3250 CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
3251 return MakeAddrLValue(EmitCXXTypeidExpr(E), E->getType());
3254 llvm::Value *CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
3255 return Builder.CreateBitCast(CGM.GetAddrOfUuidDescriptor(E),
3256 ConvertType(E->getType())->getPointerTo());
3259 LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
3260 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType());
3264 CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
3265 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
3266 Slot.setExternallyDestructed();
3267 EmitAggExpr(E->getSubExpr(), Slot);
3268 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddr());
3269 return MakeAddrLValue(Slot.getAddr(), E->getType());
3273 CodeGenFunction::EmitLambdaLValue(const LambdaExpr *E) {
3274 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
3275 EmitLambdaExpr(E, Slot);
3276 return MakeAddrLValue(Slot.getAddr(), E->getType());
3279 LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
3280 RValue RV = EmitObjCMessageExpr(E);
3283 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3285 assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&
3286 "Can't have a scalar return unless the return type is a "
3289 return MakeAddrLValue(RV.getScalarVal(), E->getType());
3292 LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
3294 CGM.getObjCRuntime().GetSelector(*this, E->getSelector(), true);
3295 return MakeAddrLValue(V, E->getType());
3298 llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
3299 const ObjCIvarDecl *Ivar) {
3300 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
3303 LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
3304 llvm::Value *BaseValue,
3305 const ObjCIvarDecl *Ivar,
3306 unsigned CVRQualifiers) {
3307 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
3308 Ivar, CVRQualifiers);
3311 LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
3312 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
3313 llvm::Value *BaseValue = nullptr;
3314 const Expr *BaseExpr = E->getBase();
3315 Qualifiers BaseQuals;
3318 BaseValue = EmitScalarExpr(BaseExpr);
3319 ObjectTy = BaseExpr->getType()->getPointeeType();
3320 BaseQuals = ObjectTy.getQualifiers();
3322 LValue BaseLV = EmitLValue(BaseExpr);
3323 // FIXME: this isn't right for bitfields.
3324 BaseValue = BaseLV.getAddress();
3325 ObjectTy = BaseExpr->getType();
3326 BaseQuals = ObjectTy.getQualifiers();
3330 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
3331 BaseQuals.getCVRQualifiers());
3332 setObjCGCLValueClass(getContext(), E, LV);
3336 LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
3337 // Can only get l-value for message expression returning aggregate type
3338 RValue RV = EmitAnyExprToTemp(E);
3339 return MakeAddrLValue(RV.getAggregateAddr(), E->getType());
3342 RValue CodeGenFunction::EmitCall(QualType CalleeType, llvm::Value *Callee,
3343 const CallExpr *E, ReturnValueSlot ReturnValue,
3344 const Decl *TargetDecl, llvm::Value *Chain) {
3345 // Get the actual function type. The callee type will always be a pointer to
3346 // function type or a block pointer type.
3347 assert(CalleeType->isFunctionPointerType() &&
3348 "Call must have function pointer type!");
3350 CalleeType = getContext().getCanonicalType(CalleeType);
3352 const auto *FnType =
3353 cast<FunctionType>(cast<PointerType>(CalleeType)->getPointeeType());
3355 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
3356 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
3357 if (llvm::Constant *PrefixSig =
3358 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
3359 SanitizerScope SanScope(this);
3360 llvm::Constant *FTRTTIConst =
3361 CGM.GetAddrOfRTTIDescriptor(QualType(FnType, 0), /*ForEH=*/true);
3362 llvm::Type *PrefixStructTyElems[] = {
3363 PrefixSig->getType(),
3364 FTRTTIConst->getType()
3366 llvm::StructType *PrefixStructTy = llvm::StructType::get(
3367 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
3369 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
3370 Callee, llvm::PointerType::getUnqual(PrefixStructTy));
3371 llvm::Value *CalleeSigPtr =
3372 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
3373 llvm::Value *CalleeSig = Builder.CreateLoad(CalleeSigPtr);
3374 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
3376 llvm::BasicBlock *Cont = createBasicBlock("cont");
3377 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
3378 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
3380 EmitBlock(TypeCheck);
3381 llvm::Value *CalleeRTTIPtr =
3382 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
3383 llvm::Value *CalleeRTTI = Builder.CreateLoad(CalleeRTTIPtr);
3384 llvm::Value *CalleeRTTIMatch =
3385 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
3386 llvm::Constant *StaticData[] = {
3387 EmitCheckSourceLocation(E->getLocStart()),
3388 EmitCheckTypeDescriptor(CalleeType)
3390 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
3391 "function_type_mismatch", StaticData, Callee);
3393 Builder.CreateBr(Cont);
3400 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
3401 CGM.getContext().VoidPtrTy);
3402 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arg_begin(),
3403 E->arg_end(), E->getDirectCallee(), /*ParamsToSkip*/ 0);
3405 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
3406 Args, FnType, /*isChainCall=*/Chain);
3409 // If the expression that denotes the called function has a type
3410 // that does not include a prototype, [the default argument
3411 // promotions are performed]. If the number of arguments does not
3412 // equal the number of parameters, the behavior is undefined. If
3413 // the function is defined with a type that includes a prototype,
3414 // and either the prototype ends with an ellipsis (, ...) or the
3415 // types of the arguments after promotion are not compatible with
3416 // the types of the parameters, the behavior is undefined. If the
3417 // function is defined with a type that does not include a
3418 // prototype, and the types of the arguments after promotion are
3419 // not compatible with those of the parameters after promotion,
3420 // the behavior is undefined [except in some trivial cases].
3421 // That is, in the general case, we should assume that a call
3422 // through an unprototyped function type works like a *non-variadic*
3423 // call. The way we make this work is to cast to the exact type
3424 // of the promoted arguments.
3426 // Chain calls use this same code path to add the invisible chain parameter
3427 // to the function type.
3428 if (isa<FunctionNoProtoType>(FnType) || Chain) {
3429 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
3430 CalleeTy = CalleeTy->getPointerTo();
3431 Callee = Builder.CreateBitCast(Callee, CalleeTy, "callee.knr.cast");
3434 return EmitCall(FnInfo, Callee, ReturnValue, Args, TargetDecl);
3437 LValue CodeGenFunction::
3438 EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
3440 if (E->getOpcode() == BO_PtrMemI)
3441 BaseV = EmitScalarExpr(E->getLHS());
3443 BaseV = EmitLValue(E->getLHS()).getAddress();
3445 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
3447 const MemberPointerType *MPT
3448 = E->getRHS()->getType()->getAs<MemberPointerType>();
3450 llvm::Value *AddV = CGM.getCXXABI().EmitMemberDataPointerAddress(
3451 *this, E, BaseV, OffsetV, MPT);
3453 return MakeAddrLValue(AddV, MPT->getPointeeType());
3456 /// Given the address of a temporary variable, produce an r-value of
3458 RValue CodeGenFunction::convertTempToRValue(llvm::Value *addr,
3460 SourceLocation loc) {
3461 LValue lvalue = MakeNaturalAlignAddrLValue(addr, type);
3462 switch (getEvaluationKind(type)) {
3464 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
3466 return lvalue.asAggregateRValue();
3468 return RValue::get(EmitLoadOfScalar(lvalue, loc));
3470 llvm_unreachable("bad evaluation kind");
3473 void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
3474 assert(Val->getType()->isFPOrFPVectorTy());
3475 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
3478 llvm::MDBuilder MDHelper(getLLVMContext());
3479 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
3481 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
3485 struct LValueOrRValue {
3491 static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
3492 const PseudoObjectExpr *E,
3494 AggValueSlot slot) {
3495 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
3497 // Find the result expression, if any.
3498 const Expr *resultExpr = E->getResultExpr();
3499 LValueOrRValue result;
3501 for (PseudoObjectExpr::const_semantics_iterator
3502 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
3503 const Expr *semantic = *i;
3505 // If this semantic expression is an opaque value, bind it
3506 // to the result of its source expression.
3507 if (const auto *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
3509 // If this is the result expression, we may need to evaluate
3510 // directly into the slot.
3511 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
3513 if (ov == resultExpr && ov->isRValue() && !forLValue &&
3514 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
3515 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
3517 LValue LV = CGF.MakeAddrLValue(slot.getAddr(), ov->getType());
3518 opaqueData = OVMA::bind(CGF, ov, LV);
3519 result.RV = slot.asRValue();
3521 // Otherwise, emit as normal.
3523 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
3525 // If this is the result, also evaluate the result now.
3526 if (ov == resultExpr) {
3528 result.LV = CGF.EmitLValue(ov);
3530 result.RV = CGF.EmitAnyExpr(ov, slot);
3534 opaques.push_back(opaqueData);
3536 // Otherwise, if the expression is the result, evaluate it
3537 // and remember the result.
3538 } else if (semantic == resultExpr) {
3540 result.LV = CGF.EmitLValue(semantic);
3542 result.RV = CGF.EmitAnyExpr(semantic, slot);
3544 // Otherwise, evaluate the expression in an ignored context.
3546 CGF.EmitIgnoredExpr(semantic);
3550 // Unbind all the opaques now.
3551 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
3552 opaques[i].unbind(CGF);
3557 RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
3558 AggValueSlot slot) {
3559 return emitPseudoObjectExpr(*this, E, false, slot).RV;
3562 LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
3563 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;