Bug Summary

File:clang/lib/CodeGen/CGExpr.cpp
Warning:line 3822, column 7
Called C++ object pointer is null

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGExpr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-12/lib/clang/12.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-11-29-190409-37574-1 -x c++ /build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp
1//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This contains code to emit Expr nodes as LLVM code.
10//
11//===----------------------------------------------------------------------===//
12
13#include "CGCXXABI.h"
14#include "CGCall.h"
15#include "CGCleanup.h"
16#include "CGDebugInfo.h"
17#include "CGObjCRuntime.h"
18#include "CGOpenMPRuntime.h"
19#include "CGRecordLayout.h"
20#include "CodeGenFunction.h"
21#include "CodeGenModule.h"
22#include "ConstantEmitter.h"
23#include "TargetInfo.h"
24#include "clang/AST/ASTContext.h"
25#include "clang/AST/Attr.h"
26#include "clang/AST/DeclObjC.h"
27#include "clang/AST/NSAPI.h"
28#include "clang/Basic/Builtins.h"
29#include "clang/Basic/CodeGenOptions.h"
30#include "clang/Basic/SourceManager.h"
31#include "llvm/ADT/Hashing.h"
32#include "llvm/ADT/StringExtras.h"
33#include "llvm/IR/DataLayout.h"
34#include "llvm/IR/Intrinsics.h"
35#include "llvm/IR/LLVMContext.h"
36#include "llvm/IR/MDBuilder.h"
37#include "llvm/Support/ConvertUTF.h"
38#include "llvm/Support/MathExtras.h"
39#include "llvm/Support/Path.h"
40#include "llvm/Transforms/Utils/SanitizerStats.h"
41
42#include <string>
43
44using namespace clang;
45using namespace CodeGen;
46
47//===--------------------------------------------------------------------===//
48// Miscellaneous Helper Methods
49//===--------------------------------------------------------------------===//
50
51llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
52 unsigned addressSpace =
53 cast<llvm::PointerType>(value->getType())->getAddressSpace();
54
55 llvm::PointerType *destType = Int8PtrTy;
56 if (addressSpace)
57 destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
58
59 if (value->getType() == destType) return value;
60 return Builder.CreateBitCast(value, destType);
61}
62
63/// CreateTempAlloca - This creates a alloca and inserts it into the entry
64/// block.
65Address CodeGenFunction::CreateTempAllocaWithoutCast(llvm::Type *Ty,
66 CharUnits Align,
67 const Twine &Name,
68 llvm::Value *ArraySize) {
69 auto Alloca = CreateTempAlloca(Ty, Name, ArraySize);
70 Alloca->setAlignment(Align.getAsAlign());
71 return Address(Alloca, Align);
72}
73
74/// CreateTempAlloca - This creates a alloca and inserts it into the entry
75/// block. The alloca is casted to default address space if necessary.
76Address CodeGenFunction::CreateTempAlloca(llvm::Type *Ty, CharUnits Align,
77 const Twine &Name,
78 llvm::Value *ArraySize,
79 Address *AllocaAddr) {
80 auto Alloca = CreateTempAllocaWithoutCast(Ty, Align, Name, ArraySize);
81 if (AllocaAddr)
82 *AllocaAddr = Alloca;
83 llvm::Value *V = Alloca.getPointer();
84 // Alloca always returns a pointer in alloca address space, which may
85 // be different from the type defined by the language. For example,
86 // in C++ the auto variables are in the default address space. Therefore
87 // cast alloca to the default address space when necessary.
88 if (getASTAllocaAddressSpace() != LangAS::Default) {
89 auto DestAddrSpace = getContext().getTargetAddressSpace(LangAS::Default);
90 llvm::IRBuilderBase::InsertPointGuard IPG(Builder);
91 // When ArraySize is nullptr, alloca is inserted at AllocaInsertPt,
92 // otherwise alloca is inserted at the current insertion point of the
93 // builder.
94 if (!ArraySize)
95 Builder.SetInsertPoint(AllocaInsertPt);
96 V = getTargetHooks().performAddrSpaceCast(
97 *this, V, getASTAllocaAddressSpace(), LangAS::Default,
98 Ty->getPointerTo(DestAddrSpace), /*non-null*/ true);
99 }
100
101 return Address(V, Align);
102}
103
104/// CreateTempAlloca - This creates an alloca and inserts it into the entry
105/// block if \p ArraySize is nullptr, otherwise inserts it at the current
106/// insertion point of the builder.
107llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
108 const Twine &Name,
109 llvm::Value *ArraySize) {
110 if (ArraySize)
111 return Builder.CreateAlloca(Ty, ArraySize, Name);
112 return new llvm::AllocaInst(Ty, CGM.getDataLayout().getAllocaAddrSpace(),
113 ArraySize, Name, AllocaInsertPt);
114}
115
116/// CreateDefaultAlignTempAlloca - This creates an alloca with the
117/// default alignment of the corresponding LLVM type, which is *not*
118/// guaranteed to be related in any way to the expected alignment of
119/// an AST type that might have been lowered to Ty.
120Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
121 const Twine &Name) {
122 CharUnits Align =
123 CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
124 return CreateTempAlloca(Ty, Align, Name);
125}
126
127void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
128 auto *Alloca = Var.getPointer();
129 assert(isa<llvm::AllocaInst>(Alloca) ||((isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst
>(Alloca) && isa<llvm::AllocaInst>( cast<
llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))
) ? static_cast<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst>(Alloca) && isa<llvm::AllocaInst>( cast<llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 132, __PRETTY_FUNCTION__))
130 (isa<llvm::AddrSpaceCastInst>(Alloca) &&((isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst
>(Alloca) && isa<llvm::AllocaInst>( cast<
llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))
) ? static_cast<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst>(Alloca) && isa<llvm::AllocaInst>( cast<llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 132, __PRETTY_FUNCTION__))
131 isa<llvm::AllocaInst>(((isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst
>(Alloca) && isa<llvm::AllocaInst>( cast<
llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))
) ? static_cast<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst>(Alloca) && isa<llvm::AllocaInst>( cast<llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 132, __PRETTY_FUNCTION__))
132 cast<llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand())))((isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst
>(Alloca) && isa<llvm::AllocaInst>( cast<
llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))
) ? static_cast<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Alloca) || (isa<llvm::AddrSpaceCastInst>(Alloca) && isa<llvm::AllocaInst>( cast<llvm::AddrSpaceCastInst>(Alloca)->getPointerOperand()))"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 132, __PRETTY_FUNCTION__))
;
133
134 auto *Store = new llvm::StoreInst(Init, Alloca, /*volatile*/ false,
135 Var.getAlignment().getAsAlign());
136 llvm::BasicBlock *Block = AllocaInsertPt->getParent();
137 Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
138}
139
140Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
141 CharUnits Align = getContext().getTypeAlignInChars(Ty);
142 return CreateTempAlloca(ConvertType(Ty), Align, Name);
143}
144
145Address CodeGenFunction::CreateMemTemp(QualType Ty, const Twine &Name,
146 Address *Alloca) {
147 // FIXME: Should we prefer the preferred type alignment here?
148 return CreateMemTemp(Ty, getContext().getTypeAlignInChars(Ty), Name, Alloca);
149}
150
151Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
152 const Twine &Name, Address *Alloca) {
153 Address Result = CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name,
154 /*ArraySize=*/nullptr, Alloca);
155
156 if (Ty->isConstantMatrixType()) {
157 auto *ArrayTy = cast<llvm::ArrayType>(Result.getType()->getElementType());
158 auto *VectorTy = llvm::FixedVectorType::get(ArrayTy->getElementType(),
159 ArrayTy->getNumElements());
160
161 Result = Address(
162 Builder.CreateBitCast(Result.getPointer(), VectorTy->getPointerTo()),
163 Result.getAlignment());
164 }
165 return Result;
166}
167
168Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty, CharUnits Align,
169 const Twine &Name) {
170 return CreateTempAllocaWithoutCast(ConvertTypeForMem(Ty), Align, Name);
171}
172
173Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty,
174 const Twine &Name) {
175 return CreateMemTempWithoutCast(Ty, getContext().getTypeAlignInChars(Ty),
176 Name);
177}
178
179/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
180/// expression and compare the result against zero, returning an Int1Ty value.
181llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
182 PGO.setCurrentStmt(E);
183 if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
184 llvm::Value *MemPtr = EmitScalarExpr(E);
185 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
186 }
187
188 QualType BoolTy = getContext().BoolTy;
189 SourceLocation Loc = E->getExprLoc();
190 CGFPOptionsRAII FPOptsRAII(*this, E);
191 if (!E->getType()->isAnyComplexType())
192 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
193
194 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
195 Loc);
196}
197
198/// EmitIgnoredExpr - Emit code to compute the specified expression,
199/// ignoring the result.
200void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
201 if (E->isRValue())
9
Taking false branch
202 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
203
204 // Just emit it as an l-value and drop the result.
205 EmitLValue(E);
10
Calling 'CodeGenFunction::EmitLValue'
206}
207
208/// EmitAnyExpr - Emit code to compute the specified expression which
209/// can have any type. The result is returned as an RValue struct.
210/// If this is an aggregate expression, AggSlot indicates where the
211/// result should be returned.
212RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
213 AggValueSlot aggSlot,
214 bool ignoreResult) {
215 switch (getEvaluationKind(E->getType())) {
216 case TEK_Scalar:
217 return RValue::get(EmitScalarExpr(E, ignoreResult));
218 case TEK_Complex:
219 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
220 case TEK_Aggregate:
221 if (!ignoreResult && aggSlot.isIgnored())
222 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
223 EmitAggExpr(E, aggSlot);
224 return aggSlot.asRValue();
225 }
226 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 226)
;
227}
228
229/// EmitAnyExprToTemp - Similar to EmitAnyExpr(), however, the result will
230/// always be accessible even if no aggregate location is provided.
231RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
232 AggValueSlot AggSlot = AggValueSlot::ignored();
233
234 if (hasAggregateEvaluationKind(E->getType()))
235 AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
236 return EmitAnyExpr(E, AggSlot);
237}
238
239/// EmitAnyExprToMem - Evaluate an expression into a given memory
240/// location.
241void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
242 Address Location,
243 Qualifiers Quals,
244 bool IsInit) {
245 // FIXME: This function should take an LValue as an argument.
246 switch (getEvaluationKind(E->getType())) {
247 case TEK_Complex:
248 EmitComplexExprIntoLValue(E, MakeAddrLValue(Location, E->getType()),
249 /*isInit*/ false);
250 return;
251
252 case TEK_Aggregate: {
253 EmitAggExpr(E, AggValueSlot::forAddr(Location, Quals,
254 AggValueSlot::IsDestructed_t(IsInit),
255 AggValueSlot::DoesNotNeedGCBarriers,
256 AggValueSlot::IsAliased_t(!IsInit),
257 AggValueSlot::MayOverlap));
258 return;
259 }
260
261 case TEK_Scalar: {
262 RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
263 LValue LV = MakeAddrLValue(Location, E->getType());
264 EmitStoreThroughLValue(RV, LV);
265 return;
266 }
267 }
268 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 268)
;
269}
270
271static void
272pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
273 const Expr *E, Address ReferenceTemporary) {
274 // Objective-C++ ARC:
275 // If we are binding a reference to a temporary that has ownership, we
276 // need to perform retain/release operations on the temporary.
277 //
278 // FIXME: This should be looking at E, not M.
279 if (auto Lifetime = M->getType().getObjCLifetime()) {
280 switch (Lifetime) {
281 case Qualifiers::OCL_None:
282 case Qualifiers::OCL_ExplicitNone:
283 // Carry on to normal cleanup handling.
284 break;
285
286 case Qualifiers::OCL_Autoreleasing:
287 // Nothing to do; cleaned up by an autorelease pool.
288 return;
289
290 case Qualifiers::OCL_Strong:
291 case Qualifiers::OCL_Weak:
292 switch (StorageDuration Duration = M->getStorageDuration()) {
293 case SD_Static:
294 // Note: we intentionally do not register a cleanup to release
295 // the object on program termination.
296 return;
297
298 case SD_Thread:
299 // FIXME: We should probably register a cleanup in this case.
300 return;
301
302 case SD_Automatic:
303 case SD_FullExpression:
304 CodeGenFunction::Destroyer *Destroy;
305 CleanupKind CleanupKind;
306 if (Lifetime == Qualifiers::OCL_Strong) {
307 const ValueDecl *VD = M->getExtendingDecl();
308 bool Precise =
309 VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
310 CleanupKind = CGF.getARCCleanupKind();
311 Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
312 : &CodeGenFunction::destroyARCStrongImprecise;
313 } else {
314 // __weak objects always get EH cleanups; otherwise, exceptions
315 // could cause really nasty crashes instead of mere leaks.
316 CleanupKind = NormalAndEHCleanup;
317 Destroy = &CodeGenFunction::destroyARCWeak;
318 }
319 if (Duration == SD_FullExpression)
320 CGF.pushDestroy(CleanupKind, ReferenceTemporary,
321 M->getType(), *Destroy,
322 CleanupKind & EHCleanup);
323 else
324 CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
325 M->getType(),
326 *Destroy, CleanupKind & EHCleanup);
327 return;
328
329 case SD_Dynamic:
330 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 330)
;
331 }
332 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 332)
;
333 }
334 }
335
336 CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
337 if (const RecordType *RT =
338 E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
339 // Get the destructor for the reference temporary.
340 auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
341 if (!ClassDecl->hasTrivialDestructor())
342 ReferenceTemporaryDtor = ClassDecl->getDestructor();
343 }
344
345 if (!ReferenceTemporaryDtor)
346 return;
347
348 // Call the destructor for the temporary.
349 switch (M->getStorageDuration()) {
350 case SD_Static:
351 case SD_Thread: {
352 llvm::FunctionCallee CleanupFn;
353 llvm::Constant *CleanupArg;
354 if (E->getType()->isArrayType()) {
355 CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
356 ReferenceTemporary, E->getType(),
357 CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
358 dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
359 CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
360 } else {
361 CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
362 GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
363 CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
364 }
365 CGF.CGM.getCXXABI().registerGlobalDtor(
366 CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
367 break;
368 }
369
370 case SD_FullExpression:
371 CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
372 CodeGenFunction::destroyCXXObject,
373 CGF.getLangOpts().Exceptions);
374 break;
375
376 case SD_Automatic:
377 CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
378 ReferenceTemporary, E->getType(),
379 CodeGenFunction::destroyCXXObject,
380 CGF.getLangOpts().Exceptions);
381 break;
382
383 case SD_Dynamic:
384 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 384)
;
385 }
386}
387
388static Address createReferenceTemporary(CodeGenFunction &CGF,
389 const MaterializeTemporaryExpr *M,
390 const Expr *Inner,
391 Address *Alloca = nullptr) {
392 auto &TCG = CGF.getTargetHooks();
393 switch (M->getStorageDuration()) {
394 case SD_FullExpression:
395 case SD_Automatic: {
396 // If we have a constant temporary array or record try to promote it into a
397 // constant global under the same rules a normal constant would've been
398 // promoted. This is easier on the optimizer and generally emits fewer
399 // instructions.
400 QualType Ty = Inner->getType();
401 if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
402 (Ty->isArrayType() || Ty->isRecordType()) &&
403 CGF.CGM.isTypeConstant(Ty, true))
404 if (auto Init = ConstantEmitter(CGF).tryEmitAbstract(Inner, Ty)) {
405 if (auto AddrSpace = CGF.getTarget().getConstantAddressSpace()) {
406 auto AS = AddrSpace.getValue();
407 auto *GV = new llvm::GlobalVariable(
408 CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
409 llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp", nullptr,
410 llvm::GlobalValue::NotThreadLocal,
411 CGF.getContext().getTargetAddressSpace(AS));
412 CharUnits alignment = CGF.getContext().getTypeAlignInChars(Ty);
413 GV->setAlignment(alignment.getAsAlign());
414 llvm::Constant *C = GV;
415 if (AS != LangAS::Default)
416 C = TCG.performAddrSpaceCast(
417 CGF.CGM, GV, AS, LangAS::Default,
418 GV->getValueType()->getPointerTo(
419 CGF.getContext().getTargetAddressSpace(LangAS::Default)));
420 // FIXME: Should we put the new global into a COMDAT?
421 return Address(C, alignment);
422 }
423 }
424 return CGF.CreateMemTemp(Ty, "ref.tmp", Alloca);
425 }
426 case SD_Thread:
427 case SD_Static:
428 return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
429
430 case SD_Dynamic:
431 llvm_unreachable("temporary can't have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary can't have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 431)
;
432 }
433 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 433)
;
434}
435
436/// Helper method to check if the underlying ABI is AAPCS
437static bool isAAPCS(const TargetInfo &TargetInfo) {
438 return TargetInfo.getABI().startswith("aapcs");
439}
440
441LValue CodeGenFunction::
442EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
443 const Expr *E = M->getSubExpr();
444
445 assert((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) ||(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 447, __PRETTY_FUNCTION__))
446 !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) &&(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 447, __PRETTY_FUNCTION__))
447 "Reference should never be pseudo-strong!")(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 447, __PRETTY_FUNCTION__))
;
448
449 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
450 // as that will cause the lifetime adjustment to be lost for ARC
451 auto ownership = M->getType().getObjCLifetime();
452 if (ownership != Qualifiers::OCL_None &&
453 ownership != Qualifiers::OCL_ExplicitNone) {
454 Address Object = createReferenceTemporary(*this, M, E);
455 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
456 Object = Address(llvm::ConstantExpr::getBitCast(Var,
457 ConvertTypeForMem(E->getType())
458 ->getPointerTo(Object.getAddressSpace())),
459 Object.getAlignment());
460
461 // createReferenceTemporary will promote the temporary to a global with a
462 // constant initializer if it can. It can only do this to a value of
463 // ARC-manageable type if the value is global and therefore "immune" to
464 // ref-counting operations. Therefore we have no need to emit either a
465 // dynamic initialization or a cleanup and we can just return the address
466 // of the temporary.
467 if (Var->hasInitializer())
468 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
469
470 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
471 }
472 LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
473 AlignmentSource::Decl);
474
475 switch (getEvaluationKind(E->getType())) {
476 default: llvm_unreachable("expected scalar or aggregate expression")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 476)
;
477 case TEK_Scalar:
478 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
479 break;
480 case TEK_Aggregate: {
481 EmitAggExpr(E, AggValueSlot::forAddr(Object,
482 E->getType().getQualifiers(),
483 AggValueSlot::IsDestructed,
484 AggValueSlot::DoesNotNeedGCBarriers,
485 AggValueSlot::IsNotAliased,
486 AggValueSlot::DoesNotOverlap));
487 break;
488 }
489 }
490
491 pushTemporaryCleanup(*this, M, E, Object);
492 return RefTempDst;
493 }
494
495 SmallVector<const Expr *, 2> CommaLHSs;
496 SmallVector<SubobjectAdjustment, 2> Adjustments;
497 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
498
499 for (const auto &Ignored : CommaLHSs)
500 EmitIgnoredExpr(Ignored);
501
502 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
503 if (opaque->getType()->isRecordType()) {
504 assert(Adjustments.empty())((Adjustments.empty()) ? static_cast<void> (0) : __assert_fail
("Adjustments.empty()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 504, __PRETTY_FUNCTION__))
;
505 return EmitOpaqueValueLValue(opaque);
506 }
507 }
508
509 // Create and initialize the reference temporary.
510 Address Alloca = Address::invalid();
511 Address Object = createReferenceTemporary(*this, M, E, &Alloca);
512 if (auto *Var = dyn_cast<llvm::GlobalVariable>(
513 Object.getPointer()->stripPointerCasts())) {
514 Object = Address(llvm::ConstantExpr::getBitCast(
515 cast<llvm::Constant>(Object.getPointer()),
516 ConvertTypeForMem(E->getType())->getPointerTo()),
517 Object.getAlignment());
518 // If the temporary is a global and has a constant initializer or is a
519 // constant temporary that we promoted to a global, we may have already
520 // initialized it.
521 if (!Var->hasInitializer()) {
522 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
523 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
524 }
525 } else {
526 switch (M->getStorageDuration()) {
527 case SD_Automatic:
528 if (auto *Size = EmitLifetimeStart(
529 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
530 Alloca.getPointer())) {
531 pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
532 Alloca, Size);
533 }
534 break;
535
536 case SD_FullExpression: {
537 if (!ShouldEmitLifetimeMarkers)
538 break;
539
540 // Avoid creating a conditional cleanup just to hold an llvm.lifetime.end
541 // marker. Instead, start the lifetime of a conditional temporary earlier
542 // so that it's unconditional. Don't do this with sanitizers which need
543 // more precise lifetime marks.
544 ConditionalEvaluation *OldConditional = nullptr;
545 CGBuilderTy::InsertPoint OldIP;
546 if (isInConditionalBranch() && !E->getType().isDestructedType() &&
547 !SanOpts.has(SanitizerKind::HWAddress) &&
548 !SanOpts.has(SanitizerKind::Memory) &&
549 !CGM.getCodeGenOpts().SanitizeAddressUseAfterScope) {
550 OldConditional = OutermostConditional;
551 OutermostConditional = nullptr;
552
553 OldIP = Builder.saveIP();
554 llvm::BasicBlock *Block = OldConditional->getStartingBlock();
555 Builder.restoreIP(CGBuilderTy::InsertPoint(
556 Block, llvm::BasicBlock::iterator(Block->back())));
557 }
558
559 if (auto *Size = EmitLifetimeStart(
560 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
561 Alloca.getPointer())) {
562 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
563 Size);
564 }
565
566 if (OldConditional) {
567 OutermostConditional = OldConditional;
568 Builder.restoreIP(OldIP);
569 }
570 break;
571 }
572
573 default:
574 break;
575 }
576 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
577 }
578 pushTemporaryCleanup(*this, M, E, Object);
579
580 // Perform derived-to-base casts and/or field accesses, to get from the
581 // temporary object we created (and, potentially, for which we extended
582 // the lifetime) to the subobject we're binding the reference to.
583 for (unsigned I = Adjustments.size(); I != 0; --I) {
584 SubobjectAdjustment &Adjustment = Adjustments[I-1];
585 switch (Adjustment.Kind) {
586 case SubobjectAdjustment::DerivedToBaseAdjustment:
587 Object =
588 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
589 Adjustment.DerivedToBase.BasePath->path_begin(),
590 Adjustment.DerivedToBase.BasePath->path_end(),
591 /*NullCheckValue=*/ false, E->getExprLoc());
592 break;
593
594 case SubobjectAdjustment::FieldAdjustment: {
595 LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
596 LV = EmitLValueForField(LV, Adjustment.Field);
597 assert(LV.isSimple() &&((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 598, __PRETTY_FUNCTION__))
598 "materialized temporary field is not a simple lvalue")((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 598, __PRETTY_FUNCTION__))
;
599 Object = LV.getAddress(*this);
600 break;
601 }
602
603 case SubobjectAdjustment::MemberPointerAdjustment: {
604 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
605 Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
606 Adjustment.Ptr.MPT);
607 break;
608 }
609 }
610 }
611
612 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
613}
614
615RValue
616CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
617 // Emit the expression as an lvalue.
618 LValue LV = EmitLValue(E);
619 assert(LV.isSimple())((LV.isSimple()) ? static_cast<void> (0) : __assert_fail
("LV.isSimple()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 619, __PRETTY_FUNCTION__))
;
620 llvm::Value *Value = LV.getPointer(*this);
621
622 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
623 // C++11 [dcl.ref]p5 (as amended by core issue 453):
624 // If a glvalue to which a reference is directly bound designates neither
625 // an existing object or function of an appropriate type nor a region of
626 // storage of suitable size and alignment to contain an object of the
627 // reference's type, the behavior is undefined.
628 QualType Ty = E->getType();
629 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
630 }
631
632 return RValue::get(Value);
633}
634
635
636/// getAccessedFieldNo - Given an encoded value and a result number, return the
637/// input field number being accessed.
638unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
639 const llvm::Constant *Elts) {
640 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
641 ->getZExtValue();
642}
643
644/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
645static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
646 llvm::Value *High) {
647 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
648 llvm::Value *K47 = Builder.getInt64(47);
649 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
650 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
651 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
652 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
653 return Builder.CreateMul(B1, KMul);
654}
655
656bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
657 return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
658 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
659}
660
661bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
662 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
663 return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
664 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
665 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
666 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
667}
668
669bool CodeGenFunction::sanitizePerformTypeCheck() const {
670 return SanOpts.has(SanitizerKind::Null) |
671 SanOpts.has(SanitizerKind::Alignment) |
672 SanOpts.has(SanitizerKind::ObjectSize) |
673 SanOpts.has(SanitizerKind::Vptr);
674}
675
676void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
677 llvm::Value *Ptr, QualType Ty,
678 CharUnits Alignment,
679 SanitizerSet SkippedChecks,
680 llvm::Value *ArraySize) {
681 if (!sanitizePerformTypeCheck())
682 return;
683
684 // Don't check pointers outside the default address space. The null check
685 // isn't correct, the object-size check isn't supported by LLVM, and we can't
686 // communicate the addresses to the runtime handler for the vptr check.
687 if (Ptr->getType()->getPointerAddressSpace())
688 return;
689
690 // Don't check pointers to volatile data. The behavior here is implementation-
691 // defined.
692 if (Ty.isVolatileQualified())
693 return;
694
695 SanitizerScope SanScope(this);
696
697 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
698 llvm::BasicBlock *Done = nullptr;
699
700 // Quickly determine whether we have a pointer to an alloca. It's possible
701 // to skip null checks, and some alignment checks, for these pointers. This
702 // can reduce compile-time significantly.
703 auto PtrToAlloca = dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCasts());
704
705 llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
706 llvm::Value *IsNonNull = nullptr;
707 bool IsGuaranteedNonNull =
708 SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
709 bool AllowNullPointers = isNullPointerAllowed(TCK);
710 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
711 !IsGuaranteedNonNull) {
712 // The glvalue must not be an empty glvalue.
713 IsNonNull = Builder.CreateIsNotNull(Ptr);
714
715 // The IR builder can constant-fold the null check if the pointer points to
716 // a constant.
717 IsGuaranteedNonNull = IsNonNull == True;
718
719 // Skip the null check if the pointer is known to be non-null.
720 if (!IsGuaranteedNonNull) {
721 if (AllowNullPointers) {
722 // When performing pointer casts, it's OK if the value is null.
723 // Skip the remaining checks in that case.
724 Done = createBasicBlock("null");
725 llvm::BasicBlock *Rest = createBasicBlock("not.null");
726 Builder.CreateCondBr(IsNonNull, Rest, Done);
727 EmitBlock(Rest);
728 } else {
729 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
730 }
731 }
732 }
733
734 if (SanOpts.has(SanitizerKind::ObjectSize) &&
735 !SkippedChecks.has(SanitizerKind::ObjectSize) &&
736 !Ty->isIncompleteType()) {
737 uint64_t TySize = CGM.getMinimumObjectSize(Ty).getQuantity();
738 llvm::Value *Size = llvm::ConstantInt::get(IntPtrTy, TySize);
739 if (ArraySize)
740 Size = Builder.CreateMul(Size, ArraySize);
741
742 // Degenerate case: new X[0] does not need an objectsize check.
743 llvm::Constant *ConstantSize = dyn_cast<llvm::Constant>(Size);
744 if (!ConstantSize || !ConstantSize->isNullValue()) {
745 // The glvalue must refer to a large enough storage region.
746 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
747 // to check this.
748 // FIXME: Get object address space
749 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
750 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
751 llvm::Value *Min = Builder.getFalse();
752 llvm::Value *NullIsUnknown = Builder.getFalse();
753 llvm::Value *Dynamic = Builder.getFalse();
754 llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
755 llvm::Value *LargeEnough = Builder.CreateICmpUGE(
756 Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown, Dynamic}), Size);
757 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
758 }
759 }
760
761 uint64_t AlignVal = 0;
762 llvm::Value *PtrAsInt = nullptr;
763
764 if (SanOpts.has(SanitizerKind::Alignment) &&
765 !SkippedChecks.has(SanitizerKind::Alignment)) {
766 AlignVal = Alignment.getQuantity();
767 if (!Ty->isIncompleteType() && !AlignVal)
768 AlignVal = CGM.getNaturalTypeAlignment(Ty, nullptr, nullptr,
769 /*ForPointeeType=*/true)
770 .getQuantity();
771
772 // The glvalue must be suitably aligned.
773 if (AlignVal > 1 &&
774 (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
775 PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
776 llvm::Value *Align = Builder.CreateAnd(
777 PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
778 llvm::Value *Aligned =
779 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
780 if (Aligned != True)
781 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
782 }
783 }
784
785 if (Checks.size() > 0) {
786 // Make sure we're not losing information. Alignment needs to be a power of
787 // 2
788 assert(!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal)((!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) ==
AlignVal) ? static_cast<void> (0) : __assert_fail ("!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 788, __PRETTY_FUNCTION__))
;
789 llvm::Constant *StaticData[] = {
790 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
791 llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
792 llvm::ConstantInt::get(Int8Ty, TCK)};
793 EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
794 PtrAsInt ? PtrAsInt : Ptr);
795 }
796
797 // If possible, check that the vptr indicates that there is a subobject of
798 // type Ty at offset zero within this object.
799 //
800 // C++11 [basic.life]p5,6:
801 // [For storage which does not refer to an object within its lifetime]
802 // The program has undefined behavior if:
803 // -- the [pointer or glvalue] is used to access a non-static data member
804 // or call a non-static member function
805 if (SanOpts.has(SanitizerKind::Vptr) &&
806 !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
807 // Ensure that the pointer is non-null before loading it. If there is no
808 // compile-time guarantee, reuse the run-time null check or emit a new one.
809 if (!IsGuaranteedNonNull) {
810 if (!IsNonNull)
811 IsNonNull = Builder.CreateIsNotNull(Ptr);
812 if (!Done)
813 Done = createBasicBlock("vptr.null");
814 llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
815 Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
816 EmitBlock(VptrNotNull);
817 }
818
819 // Compute a hash of the mangled name of the type.
820 //
821 // FIXME: This is not guaranteed to be deterministic! Move to a
822 // fingerprinting mechanism once LLVM provides one. For the time
823 // being the implementation happens to be deterministic.
824 SmallString<64> MangledName;
825 llvm::raw_svector_ostream Out(MangledName);
826 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
827 Out);
828
829 // Blacklist based on the mangled type.
830 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
831 SanitizerKind::Vptr, Out.str())) {
832 llvm::hash_code TypeHash = hash_value(Out.str());
833
834 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
835 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
836 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
837 Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
838 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
839 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
840
841 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
842 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
843
844 // Look the hash up in our cache.
845 const int CacheSize = 128;
846 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
847 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
848 "__ubsan_vptr_type_cache");
849 llvm::Value *Slot = Builder.CreateAnd(Hash,
850 llvm::ConstantInt::get(IntPtrTy,
851 CacheSize-1));
852 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
853 llvm::Value *CacheVal =
854 Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
855 getPointerAlign());
856
857 // If the hash isn't in the cache, call a runtime handler to perform the
858 // hard work of checking whether the vptr is for an object of the right
859 // type. This will either fill in the cache and return, or produce a
860 // diagnostic.
861 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
862 llvm::Constant *StaticData[] = {
863 EmitCheckSourceLocation(Loc),
864 EmitCheckTypeDescriptor(Ty),
865 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
866 llvm::ConstantInt::get(Int8Ty, TCK)
867 };
868 llvm::Value *DynamicData[] = { Ptr, Hash };
869 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
870 SanitizerHandler::DynamicTypeCacheMiss, StaticData,
871 DynamicData);
872 }
873 }
874
875 if (Done) {
876 Builder.CreateBr(Done);
877 EmitBlock(Done);
878 }
879}
880
881/// Determine whether this expression refers to a flexible array member in a
882/// struct. We disable array bounds checks for such members.
883static bool isFlexibleArrayMemberExpr(const Expr *E) {
884 // For compatibility with existing code, we treat arrays of length 0 or
885 // 1 as flexible array members.
886 // FIXME: This is inconsistent with the warning code in SemaChecking. Unify
887 // the two mechanisms.
888 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
889 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
890 // FIXME: Sema doesn't treat [1] as a flexible array member if the bound
891 // was produced by macro expansion.
892 if (CAT->getSize().ugt(1))
893 return false;
894 } else if (!isa<IncompleteArrayType>(AT))
895 return false;
896
897 E = E->IgnoreParens();
898
899 // A flexible array member must be the last member in the class.
900 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
901 // FIXME: If the base type of the member expr is not FD->getParent(),
902 // this should not be treated as a flexible array member access.
903 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
904 // FIXME: Sema doesn't treat a T[1] union member as a flexible array
905 // member, only a T[0] or T[] member gets that treatment.
906 if (FD->getParent()->isUnion())
907 return true;
908 RecordDecl::field_iterator FI(
909 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
910 return ++FI == FD->getParent()->field_end();
911 }
912 } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
913 return IRE->getDecl()->getNextIvar() == nullptr;
914 }
915
916 return false;
917}
918
919llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
920 QualType EltTy) {
921 ASTContext &C = getContext();
922 uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
923 if (!EltSize)
924 return nullptr;
925
926 auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
927 if (!ArrayDeclRef)
928 return nullptr;
929
930 auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
931 if (!ParamDecl)
932 return nullptr;
933
934 auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
935 if (!POSAttr)
936 return nullptr;
937
938 // Don't load the size if it's a lower bound.
939 int POSType = POSAttr->getType();
940 if (POSType != 0 && POSType != 1)
941 return nullptr;
942
943 // Find the implicit size parameter.
944 auto PassedSizeIt = SizeArguments.find(ParamDecl);
945 if (PassedSizeIt == SizeArguments.end())
946 return nullptr;
947
948 const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
949 assert(LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable")((LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable"
) ? static_cast<void> (0) : __assert_fail ("LocalDeclMap.count(PassedSizeDecl) && \"Passed size not loadable\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 949, __PRETTY_FUNCTION__))
;
950 Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
951 llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
952 C.getSizeType(), E->getExprLoc());
953 llvm::Value *SizeOfElement =
954 llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
955 return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
956}
957
958/// If Base is known to point to the start of an array, return the length of
959/// that array. Return 0 if the length cannot be determined.
960static llvm::Value *getArrayIndexingBound(
961 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
962 // For the vector indexing extension, the bound is the number of elements.
963 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
964 IndexedType = Base->getType();
965 return CGF.Builder.getInt32(VT->getNumElements());
966 }
967
968 Base = Base->IgnoreParens();
969
970 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
971 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
972 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
973 IndexedType = CE->getSubExpr()->getType();
974 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
975 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
976 return CGF.Builder.getInt(CAT->getSize());
977 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
978 return CGF.getVLASize(VAT).NumElts;
979 // Ignore pass_object_size here. It's not applicable on decayed pointers.
980 }
981 }
982
983 QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
984 if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
985 IndexedType = Base->getType();
986 return POS;
987 }
988
989 return nullptr;
990}
991
992void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
993 llvm::Value *Index, QualType IndexType,
994 bool Accessed) {
995 assert(SanOpts.has(SanitizerKind::ArrayBounds) &&((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 996, __PRETTY_FUNCTION__))
996 "should not be called unless adding bounds checks")((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 996, __PRETTY_FUNCTION__))
;
997 SanitizerScope SanScope(this);
998
999 QualType IndexedType;
1000 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
1001 if (!Bound)
1002 return;
1003
1004 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
1005 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
1006 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
1007
1008 llvm::Constant *StaticData[] = {
1009 EmitCheckSourceLocation(E->getExprLoc()),
1010 EmitCheckTypeDescriptor(IndexedType),
1011 EmitCheckTypeDescriptor(IndexType)
1012 };
1013 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
1014 : Builder.CreateICmpULE(IndexVal, BoundVal);
1015 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
1016 SanitizerHandler::OutOfBounds, StaticData, Index);
1017}
1018
1019
1020CodeGenFunction::ComplexPairTy CodeGenFunction::
1021EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
1022 bool isInc, bool isPre) {
1023 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
1024
1025 llvm::Value *NextVal;
1026 if (isa<llvm::IntegerType>(InVal.first->getType())) {
1027 uint64_t AmountVal = isInc ? 1 : -1;
1028 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
1029
1030 // Add the inc/dec to the real part.
1031 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1032 } else {
1033 QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
1034 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
1035 if (!isInc)
1036 FVal.changeSign();
1037 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
1038
1039 // Add the inc/dec to the real part.
1040 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1041 }
1042
1043 ComplexPairTy IncVal(NextVal, InVal.second);
1044
1045 // Store the updated result through the lvalue.
1046 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
1047 if (getLangOpts().OpenMP)
1048 CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
1049 E->getSubExpr());
1050
1051 // If this is a postinc, return the value read from memory, otherwise use the
1052 // updated value.
1053 return isPre ? IncVal : InVal;
1054}
1055
1056void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
1057 CodeGenFunction *CGF) {
1058 // Bind VLAs in the cast type.
1059 if (CGF && E->getType()->isVariablyModifiedType())
1060 CGF->EmitVariablyModifiedType(E->getType());
1061
1062 if (CGDebugInfo *DI = getModuleDebugInfo())
1063 DI->EmitExplicitCastType(E->getType());
1064}
1065
1066//===----------------------------------------------------------------------===//
1067// LValue Expression Emission
1068//===----------------------------------------------------------------------===//
1069
1070/// EmitPointerWithAlignment - Given an expression of pointer type, try to
1071/// derive a more accurate bound on the alignment of the pointer.
1072Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
1073 LValueBaseInfo *BaseInfo,
1074 TBAAAccessInfo *TBAAInfo) {
1075 // We allow this with ObjC object pointers because of fragile ABIs.
1076 assert(E->getType()->isPointerType() ||((E->getType()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1077, __PRETTY_FUNCTION__))
1077 E->getType()->isObjCObjectPointerType())((E->getType()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1077, __PRETTY_FUNCTION__))
;
1078 E = E->IgnoreParens();
1079
1080 // Casts:
1081 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
1082 if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
1083 CGM.EmitExplicitCastExprType(ECE, this);
1084
1085 switch (CE->getCastKind()) {
1086 // Non-converting casts (but not C's implicit conversion from void*).
1087 case CK_BitCast:
1088 case CK_NoOp:
1089 case CK_AddressSpaceConversion:
1090 if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
1091 if (PtrTy->getPointeeType()->isVoidType())
1092 break;
1093
1094 LValueBaseInfo InnerBaseInfo;
1095 TBAAAccessInfo InnerTBAAInfo;
1096 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
1097 &InnerBaseInfo,
1098 &InnerTBAAInfo);
1099 if (BaseInfo) *BaseInfo = InnerBaseInfo;
1100 if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
1101
1102 if (isa<ExplicitCastExpr>(CE)) {
1103 LValueBaseInfo TargetTypeBaseInfo;
1104 TBAAAccessInfo TargetTypeTBAAInfo;
1105 CharUnits Align = CGM.getNaturalPointeeTypeAlignment(
1106 E->getType(), &TargetTypeBaseInfo, &TargetTypeTBAAInfo);
1107 if (TBAAInfo)
1108 *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
1109 TargetTypeTBAAInfo);
1110 // If the source l-value is opaque, honor the alignment of the
1111 // casted-to type.
1112 if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
1113 if (BaseInfo)
1114 BaseInfo->mergeForCast(TargetTypeBaseInfo);
1115 Addr = Address(Addr.getPointer(), Align);
1116 }
1117 }
1118
1119 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
1120 CE->getCastKind() == CK_BitCast) {
1121 if (auto PT = E->getType()->getAs<PointerType>())
1122 EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
1123 /*MayBeNull=*/true,
1124 CodeGenFunction::CFITCK_UnrelatedCast,
1125 CE->getBeginLoc());
1126 }
1127 return CE->getCastKind() != CK_AddressSpaceConversion
1128 ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
1129 : Builder.CreateAddrSpaceCast(Addr,
1130 ConvertType(E->getType()));
1131 }
1132 break;
1133
1134 // Array-to-pointer decay.
1135 case CK_ArrayToPointerDecay:
1136 return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
1137
1138 // Derived-to-base conversions.
1139 case CK_UncheckedDerivedToBase:
1140 case CK_DerivedToBase: {
1141 // TODO: Support accesses to members of base classes in TBAA. For now, we
1142 // conservatively pretend that the complete object is of the base class
1143 // type.
1144 if (TBAAInfo)
1145 *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
1146 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
1147 auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
1148 return GetAddressOfBaseClass(Addr, Derived,
1149 CE->path_begin(), CE->path_end(),
1150 ShouldNullCheckClassCastValue(CE),
1151 CE->getExprLoc());
1152 }
1153
1154 // TODO: Is there any reason to treat base-to-derived conversions
1155 // specially?
1156 default:
1157 break;
1158 }
1159 }
1160
1161 // Unary &.
1162 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
1163 if (UO->getOpcode() == UO_AddrOf) {
1164 LValue LV = EmitLValue(UO->getSubExpr());
1165 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
1166 if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
1167 return LV.getAddress(*this);
1168 }
1169 }
1170
1171 // TODO: conditional operators, comma.
1172
1173 // Otherwise, use the alignment of the type.
1174 CharUnits Align =
1175 CGM.getNaturalPointeeTypeAlignment(E->getType(), BaseInfo, TBAAInfo);
1176 return Address(EmitScalarExpr(E), Align);
1177}
1178
1179llvm::Value *CodeGenFunction::EmitNonNullRValueCheck(RValue RV, QualType T) {
1180 llvm::Value *V = RV.getScalarVal();
1181 if (auto MPT = T->getAs<MemberPointerType>())
1182 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, V, MPT);
1183 return Builder.CreateICmpNE(V, llvm::Constant::getNullValue(V->getType()));
1184}
1185
1186RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
1187 if (Ty->isVoidType())
1188 return RValue::get(nullptr);
1189
1190 switch (getEvaluationKind(Ty)) {
1191 case TEK_Complex: {
1192 llvm::Type *EltTy =
1193 ConvertType(Ty->castAs<ComplexType>()->getElementType());
1194 llvm::Value *U = llvm::UndefValue::get(EltTy);
1195 return RValue::getComplex(std::make_pair(U, U));
1196 }
1197
1198 // If this is a use of an undefined aggregate type, the aggregate must have an
1199 // identifiable address. Just because the contents of the value are undefined
1200 // doesn't mean that the address can't be taken and compared.
1201 case TEK_Aggregate: {
1202 Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
1203 return RValue::getAggregate(DestPtr);
1204 }
1205
1206 case TEK_Scalar:
1207 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
1208 }
1209 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1209)
;
1210}
1211
1212RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
1213 const char *Name) {
1214 ErrorUnsupported(E, Name);
1215 return GetUndefRValue(E->getType());
1216}
1217
1218LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
1219 const char *Name) {
1220 ErrorUnsupported(E, Name);
1221 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
1222 return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
1223 E->getType());
1224}
1225
1226bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
1227 const Expr *Base = Obj;
1228 while (!isa<CXXThisExpr>(Base)) {
1229 // The result of a dynamic_cast can be null.
1230 if (isa<CXXDynamicCastExpr>(Base))
1231 return false;
1232
1233 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
1234 Base = CE->getSubExpr();
1235 } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
1236 Base = PE->getSubExpr();
1237 } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
1238 if (UO->getOpcode() == UO_Extension)
1239 Base = UO->getSubExpr();
1240 else
1241 return false;
1242 } else {
1243 return false;
1244 }
1245 }
1246 return true;
1247}
1248
1249LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
1250 LValue LV;
1251 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
1252 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
1253 else
1254 LV = EmitLValue(E);
1255 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
1256 SanitizerSet SkippedChecks;
1257 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
1258 bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
1259 if (IsBaseCXXThis)
1260 SkippedChecks.set(SanitizerKind::Alignment, true);
1261 if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
1262 SkippedChecks.set(SanitizerKind::Null, true);
1263 }
1264 EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(*this), E->getType(),
1265 LV.getAlignment(), SkippedChecks);
1266 }
1267 return LV;
1268}
1269
1270/// EmitLValue - Emit code to compute a designator that specifies the location
1271/// of the expression.
1272///
1273/// This can return one of two things: a simple address or a bitfield reference.
1274/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1275/// an LLVM pointer type.
1276///
1277/// If this returns a bitfield reference, nothing about the pointee type of the
1278/// LLVM value is known: For example, it may not be a pointer to an integer.
1279///
1280/// If this returns a normal address, and if the lvalue's C type is fixed size,
1281/// this method guarantees that the returned pointer type will point to an LLVM
1282/// type of the same size of the lvalue's type. If the lvalue has a variable
1283/// length type, this is not possible.
1284///
1285LValue CodeGenFunction::EmitLValue(const Expr *E) {
1286 ApplyDebugLocation DL(*this, E);
1287 switch (E->getStmtClass()) {
11
Control jumps to 'case SubstNonTypeTemplateParmExprClass:' at line 1409
14
Control jumps to 'case MatrixSubscriptExprClass:' at line 1391
1288 default: return EmitUnsupportedLValue(E, "l-value expression");
1289
1290 case Expr::ObjCPropertyRefExprClass:
1291 llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1291)
;
1292
1293 case Expr::ObjCSelectorExprClass:
1294 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
1295 case Expr::ObjCIsaExprClass:
1296 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
1297 case Expr::BinaryOperatorClass:
1298 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
1299 case Expr::CompoundAssignOperatorClass: {
1300 QualType Ty = E->getType();
1301 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1302 Ty = AT->getValueType();
1303 if (!Ty->isAnyComplexType())
1304 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1305 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1306 }
1307 case Expr::CallExprClass:
1308 case Expr::CXXMemberCallExprClass:
1309 case Expr::CXXOperatorCallExprClass:
1310 case Expr::UserDefinedLiteralClass:
1311 return EmitCallExprLValue(cast<CallExpr>(E));
1312 case Expr::CXXRewrittenBinaryOperatorClass:
1313 return EmitLValue(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm());
1314 case Expr::VAArgExprClass:
1315 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
1316 case Expr::DeclRefExprClass:
1317 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
1318 case Expr::ConstantExprClass: {
1319 const ConstantExpr *CE = cast<ConstantExpr>(E);
1320 if (llvm::Value *Result = ConstantEmitter(*this).tryEmitConstantExpr(CE)) {
1321 QualType RetType = cast<CallExpr>(CE->getSubExpr()->IgnoreImplicit())
1322 ->getCallReturnType(getContext());
1323 return MakeNaturalAlignAddrLValue(Result, RetType);
1324 }
1325 return EmitLValue(cast<ConstantExpr>(E)->getSubExpr());
1326 }
1327 case Expr::ParenExprClass:
1328 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
1329 case Expr::GenericSelectionExprClass:
1330 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
1331 case Expr::PredefinedExprClass:
1332 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
1333 case Expr::StringLiteralClass:
1334 return EmitStringLiteralLValue(cast<StringLiteral>(E));
1335 case Expr::ObjCEncodeExprClass:
1336 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
1337 case Expr::PseudoObjectExprClass:
1338 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
1339 case Expr::InitListExprClass:
1340 return EmitInitListLValue(cast<InitListExpr>(E));
1341 case Expr::CXXTemporaryObjectExprClass:
1342 case Expr::CXXConstructExprClass:
1343 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
1344 case Expr::CXXBindTemporaryExprClass:
1345 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
1346 case Expr::CXXUuidofExprClass:
1347 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
1348 case Expr::LambdaExprClass:
1349 return EmitAggExprToLValue(E);
1350
1351 case Expr::ExprWithCleanupsClass: {
1352 const auto *cleanups = cast<ExprWithCleanups>(E);
1353 RunCleanupsScope Scope(*this);
1354 LValue LV = EmitLValue(cleanups->getSubExpr());
1355 if (LV.isSimple()) {
1356 // Defend against branches out of gnu statement expressions surrounded by
1357 // cleanups.
1358 llvm::Value *V = LV.getPointer(*this);
1359 Scope.ForceCleanup({&V});
1360 return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
1361 getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
1362 }
1363 // FIXME: Is it possible to create an ExprWithCleanups that produces a
1364 // bitfield lvalue or some other non-simple lvalue?
1365 return LV;
1366 }
1367
1368 case Expr::CXXDefaultArgExprClass: {
1369 auto *DAE = cast<CXXDefaultArgExpr>(E);
1370 CXXDefaultArgExprScope Scope(*this, DAE);
1371 return EmitLValue(DAE->getExpr());
1372 }
1373 case Expr::CXXDefaultInitExprClass: {
1374 auto *DIE = cast<CXXDefaultInitExpr>(E);
1375 CXXDefaultInitExprScope Scope(*this, DIE);
1376 return EmitLValue(DIE->getExpr());
1377 }
1378 case Expr::CXXTypeidExprClass:
1379 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
1380
1381 case Expr::ObjCMessageExprClass:
1382 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
1383 case Expr::ObjCIvarRefExprClass:
1384 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
1385 case Expr::StmtExprClass:
1386 return EmitStmtExprLValue(cast<StmtExpr>(E));
1387 case Expr::UnaryOperatorClass:
1388 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
1389 case Expr::ArraySubscriptExprClass:
1390 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
1391 case Expr::MatrixSubscriptExprClass:
1392 return EmitMatrixSubscriptExpr(cast<MatrixSubscriptExpr>(E));
15
'E' is a 'MatrixSubscriptExpr'
16
Calling 'CodeGenFunction::EmitMatrixSubscriptExpr'
1393 case Expr::OMPArraySectionExprClass:
1394 return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
1395 case Expr::ExtVectorElementExprClass:
1396 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
1397 case Expr::MemberExprClass:
1398 return EmitMemberExpr(cast<MemberExpr>(E));
1399 case Expr::CompoundLiteralExprClass:
1400 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
1401 case Expr::ConditionalOperatorClass:
1402 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
1403 case Expr::BinaryConditionalOperatorClass:
1404 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
1405 case Expr::ChooseExprClass:
1406 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
1407 case Expr::OpaqueValueExprClass:
1408 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
1409 case Expr::SubstNonTypeTemplateParmExprClass:
1410 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
12
'E' is a 'SubstNonTypeTemplateParmExpr'
13
Calling 'CodeGenFunction::EmitLValue'
1411 case Expr::ImplicitCastExprClass:
1412 case Expr::CStyleCastExprClass:
1413 case Expr::CXXFunctionalCastExprClass:
1414 case Expr::CXXStaticCastExprClass:
1415 case Expr::CXXDynamicCastExprClass:
1416 case Expr::CXXReinterpretCastExprClass:
1417 case Expr::CXXConstCastExprClass:
1418 case Expr::CXXAddrspaceCastExprClass:
1419 case Expr::ObjCBridgedCastExprClass:
1420 return EmitCastLValue(cast<CastExpr>(E));
1421
1422 case Expr::MaterializeTemporaryExprClass:
1423 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
1424
1425 case Expr::CoawaitExprClass:
1426 return EmitCoawaitLValue(cast<CoawaitExpr>(E));
1427 case Expr::CoyieldExprClass:
1428 return EmitCoyieldLValue(cast<CoyieldExpr>(E));
1429 }
1430}
1431
1432/// Given an object of the given canonical type, can we safely copy a
1433/// value out of it based on its initializer?
1434static bool isConstantEmittableObjectType(QualType type) {
1435 assert(type.isCanonical())((type.isCanonical()) ? static_cast<void> (0) : __assert_fail
("type.isCanonical()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1435, __PRETTY_FUNCTION__))
;
1436 assert(!type->isReferenceType())((!type->isReferenceType()) ? static_cast<void> (0) :
__assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1436, __PRETTY_FUNCTION__))
;
1437
1438 // Must be const-qualified but non-volatile.
1439 Qualifiers qs = type.getLocalQualifiers();
1440 if (!qs.hasConst() || qs.hasVolatile()) return false;
1441
1442 // Otherwise, all object types satisfy this except C++ classes with
1443 // mutable subobjects or non-trivial copy/destroy behavior.
1444 if (const auto *RT = dyn_cast<RecordType>(type))
1445 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1446 if (RD->hasMutableFields() || !RD->isTrivial())
1447 return false;
1448
1449 return true;
1450}
1451
1452/// Can we constant-emit a load of a reference to a variable of the
1453/// given type? This is different from predicates like
1454/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
1455/// in situations that don't necessarily satisfy the language's rules
1456/// for this (e.g. C++'s ODR-use rules). For example, we want to able
1457/// to do this with const float variables even if those variables
1458/// aren't marked 'constexpr'.
1459enum ConstantEmissionKind {
1460 CEK_None,
1461 CEK_AsReferenceOnly,
1462 CEK_AsValueOrReference,
1463 CEK_AsValueOnly
1464};
1465static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
1466 type = type.getCanonicalType();
1467 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
1468 if (isConstantEmittableObjectType(ref->getPointeeType()))
1469 return CEK_AsValueOrReference;
1470 return CEK_AsReferenceOnly;
1471 }
1472 if (isConstantEmittableObjectType(type))
1473 return CEK_AsValueOnly;
1474 return CEK_None;
1475}
1476
1477/// Try to emit a reference to the given value without producing it as
1478/// an l-value. This is just an optimization, but it avoids us needing
1479/// to emit global copies of variables if they're named without triggering
1480/// a formal use in a context where we can't emit a direct reference to them,
1481/// for instance if a block or lambda or a member of a local class uses a
1482/// const int variable or constexpr variable from an enclosing function.
1483CodeGenFunction::ConstantEmission
1484CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1485 ValueDecl *value = refExpr->getDecl();
1486
1487 // The value needs to be an enum constant or a constant variable.
1488 ConstantEmissionKind CEK;
1489 if (isa<ParmVarDecl>(value)) {
1490 CEK = CEK_None;
1491 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1492 CEK = checkVarTypeForConstantEmission(var->getType());
1493 } else if (isa<EnumConstantDecl>(value)) {
1494 CEK = CEK_AsValueOnly;
1495 } else {
1496 CEK = CEK_None;
1497 }
1498 if (CEK == CEK_None) return ConstantEmission();
1499
1500 Expr::EvalResult result;
1501 bool resultIsReference;
1502 QualType resultType;
1503
1504 // It's best to evaluate all the way as an r-value if that's permitted.
1505 if (CEK != CEK_AsReferenceOnly &&
1506 refExpr->EvaluateAsRValue(result, getContext())) {
1507 resultIsReference = false;
1508 resultType = refExpr->getType();
1509
1510 // Otherwise, try to evaluate as an l-value.
1511 } else if (CEK != CEK_AsValueOnly &&
1512 refExpr->EvaluateAsLValue(result, getContext())) {
1513 resultIsReference = true;
1514 resultType = value->getType();
1515
1516 // Failure.
1517 } else {
1518 return ConstantEmission();
1519 }
1520
1521 // In any case, if the initializer has side-effects, abandon ship.
1522 if (result.HasSideEffects)
1523 return ConstantEmission();
1524
1525 // Emit as a constant.
1526 auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
1527 result.Val, resultType);
1528
1529 // Make sure we emit a debug reference to the global variable.
1530 // This should probably fire even for
1531 if (isa<VarDecl>(value)) {
1532 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1533 EmitDeclRefExprDbgValue(refExpr, result.Val);
1534 } else {
1535 assert(isa<EnumConstantDecl>(value))((isa<EnumConstantDecl>(value)) ? static_cast<void>
(0) : __assert_fail ("isa<EnumConstantDecl>(value)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1535, __PRETTY_FUNCTION__))
;
1536 EmitDeclRefExprDbgValue(refExpr, result.Val);
1537 }
1538
1539 // If we emitted a reference constant, we need to dereference that.
1540 if (resultIsReference)
1541 return ConstantEmission::forReference(C);
1542
1543 return ConstantEmission::forValue(C);
1544}
1545
1546static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
1547 const MemberExpr *ME) {
1548 if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
1549 // Try to emit static variable member expressions as DREs.
1550 return DeclRefExpr::Create(
1551 CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
1552 /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
1553 ME->getType(), ME->getValueKind(), nullptr, nullptr, ME->isNonOdrUse());
1554 }
1555 return nullptr;
1556}
1557
1558CodeGenFunction::ConstantEmission
1559CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
1560 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
1561 return tryEmitAsConstant(DRE);
1562 return ConstantEmission();
1563}
1564
1565llvm::Value *CodeGenFunction::emitScalarConstant(
1566 const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
1567 assert(Constant && "not a constant")((Constant && "not a constant") ? static_cast<void
> (0) : __assert_fail ("Constant && \"not a constant\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1567, __PRETTY_FUNCTION__))
;
1568 if (Constant.isReference())
1569 return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
1570 E->getExprLoc())
1571 .getScalarVal();
1572 return Constant.getValue();
1573}
1574
1575llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1576 SourceLocation Loc) {
1577 return EmitLoadOfScalar(lvalue.getAddress(*this), lvalue.isVolatile(),
1578 lvalue.getType(), Loc, lvalue.getBaseInfo(),
1579 lvalue.getTBAAInfo(), lvalue.isNontemporal());
1580}
1581
1582static bool hasBooleanRepresentation(QualType Ty) {
1583 if (Ty->isBooleanType())
1584 return true;
1585
1586 if (const EnumType *ET = Ty->getAs<EnumType>())
1587 return ET->getDecl()->getIntegerType()->isBooleanType();
1588
1589 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1590 return hasBooleanRepresentation(AT->getValueType());
1591
1592 return false;
1593}
1594
1595static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1596 llvm::APInt &Min, llvm::APInt &End,
1597 bool StrictEnums, bool IsBool) {
1598 const EnumType *ET = Ty->getAs<EnumType>();
1599 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1600 ET && !ET->getDecl()->isFixed();
1601 if (!IsBool && !IsRegularCPlusPlusEnum)
1602 return false;
1603
1604 if (IsBool) {
1605 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1606 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1607 } else {
1608 const EnumDecl *ED = ET->getDecl();
1609 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1610 unsigned Bitwidth = LTy->getScalarSizeInBits();
1611 unsigned NumNegativeBits = ED->getNumNegativeBits();
1612 unsigned NumPositiveBits = ED->getNumPositiveBits();
1613
1614 if (NumNegativeBits) {
1615 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1616 assert(NumBits <= Bitwidth)((NumBits <= Bitwidth) ? static_cast<void> (0) : __assert_fail
("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1616, __PRETTY_FUNCTION__))
;
1617 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1618 Min = -End;
1619 } else {
1620 assert(NumPositiveBits <= Bitwidth)((NumPositiveBits <= Bitwidth) ? static_cast<void> (
0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1620, __PRETTY_FUNCTION__))
;
1621 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1622 Min = llvm::APInt(Bitwidth, 0);
1623 }
1624 }
1625 return true;
1626}
1627
1628llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1629 llvm::APInt Min, End;
1630 if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
1631 hasBooleanRepresentation(Ty)))
1632 return nullptr;
1633
1634 llvm::MDBuilder MDHelper(getLLVMContext());
1635 return MDHelper.createRange(Min, End);
1636}
1637
1638bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
1639 SourceLocation Loc) {
1640 bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
1641 bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
1642 if (!HasBoolCheck && !HasEnumCheck)
1643 return false;
1644
1645 bool IsBool = hasBooleanRepresentation(Ty) ||
1646 NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
1647 bool NeedsBoolCheck = HasBoolCheck && IsBool;
1648 bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
1649 if (!NeedsBoolCheck && !NeedsEnumCheck)
1650 return false;
1651
1652 // Single-bit booleans don't need to be checked. Special-case this to avoid
1653 // a bit width mismatch when handling bitfield values. This is handled by
1654 // EmitFromMemory for the non-bitfield case.
1655 if (IsBool &&
1656 cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
1657 return false;
1658
1659 llvm::APInt Min, End;
1660 if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
1661 return true;
1662
1663 auto &Ctx = getLLVMContext();
1664 SanitizerScope SanScope(this);
1665 llvm::Value *Check;
1666 --End;
1667 if (!Min) {
1668 Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
1669 } else {
1670 llvm::Value *Upper =
1671 Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
1672 llvm::Value *Lower =
1673 Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
1674 Check = Builder.CreateAnd(Upper, Lower);
1675 }
1676 llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
1677 EmitCheckTypeDescriptor(Ty)};
1678 SanitizerMask Kind =
1679 NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1680 EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
1681 StaticArgs, EmitCheckValue(Value));
1682 return true;
1683}
1684
1685llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
1686 QualType Ty,
1687 SourceLocation Loc,
1688 LValueBaseInfo BaseInfo,
1689 TBAAAccessInfo TBAAInfo,
1690 bool isNontemporal) {
1691 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1692 // For better performance, handle vector loads differently.
1693 if (Ty->isVectorType()) {
1694 const llvm::Type *EltTy = Addr.getElementType();
1695
1696 const auto *VTy = cast<llvm::FixedVectorType>(EltTy);
1697
1698 // Handle vectors of size 3 like size 4 for better performance.
1699 if (VTy->getNumElements() == 3) {
1700
1701 // Bitcast to vec4 type.
1702 auto *vec4Ty = llvm::FixedVectorType::get(VTy->getElementType(), 4);
1703 Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
1704 // Now load value.
1705 llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1706
1707 // Shuffle vector to get vec3.
1708 V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
1709 ArrayRef<int>{0, 1, 2}, "extractVec");
1710 return EmitFromMemory(V, Ty);
1711 }
1712 }
1713 }
1714
1715 // Atomic operations have to be done on integral types.
1716 LValue AtomicLValue =
1717 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1718 if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
1719 return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
1720 }
1721
1722 llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
1723 if (isNontemporal) {
1724 llvm::MDNode *Node = llvm::MDNode::get(
1725 Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1726 Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1727 }
1728
1729 CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
1730
1731 if (EmitScalarRangeCheck(Load, Ty, Loc)) {
1732 // In order to prevent the optimizer from throwing away the check, don't
1733 // attach range metadata to the load.
1734 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1735 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1736 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1737
1738 return EmitFromMemory(Load, Ty);
1739}
1740
1741llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1742 // Bool has a different representation in memory than in registers.
1743 if (hasBooleanRepresentation(Ty)) {
1744 // This should really always be an i1, but sometimes it's already
1745 // an i8, and it's awkward to track those cases down.
1746 if (Value->getType()->isIntegerTy(1))
1747 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1748 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1749, __PRETTY_FUNCTION__))
1749 "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1749, __PRETTY_FUNCTION__))
;
1750 }
1751
1752 return Value;
1753}
1754
1755llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1756 // Bool has a different representation in memory than in registers.
1757 if (hasBooleanRepresentation(Ty)) {
1758 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1759, __PRETTY_FUNCTION__))
1759 "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1759, __PRETTY_FUNCTION__))
;
1760 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1761 }
1762
1763 return Value;
1764}
1765
1766// Convert the pointer of \p Addr to a pointer to a vector (the value type of
1767// MatrixType), if it points to a array (the memory type of MatrixType).
1768static Address MaybeConvertMatrixAddress(Address Addr, CodeGenFunction &CGF,
1769 bool IsVector = true) {
1770 auto *ArrayTy = dyn_cast<llvm::ArrayType>(
1771 cast<llvm::PointerType>(Addr.getPointer()->getType())->getElementType());
1772 if (ArrayTy && IsVector) {
1773 auto *VectorTy = llvm::FixedVectorType::get(ArrayTy->getElementType(),
1774 ArrayTy->getNumElements());
1775
1776 return Address(CGF.Builder.CreateElementBitCast(Addr, VectorTy));
1777 }
1778 auto *VectorTy = dyn_cast<llvm::VectorType>(
1779 cast<llvm::PointerType>(Addr.getPointer()->getType())->getElementType());
1780 if (VectorTy && !IsVector) {
1781 auto *ArrayTy = llvm::ArrayType::get(
1782 VectorTy->getElementType(),
1783 cast<llvm::FixedVectorType>(VectorTy)->getNumElements());
1784
1785 return Address(CGF.Builder.CreateElementBitCast(Addr, ArrayTy));
1786 }
1787
1788 return Addr;
1789}
1790
1791// Emit a store of a matrix LValue. This may require casting the original
1792// pointer to memory address (ArrayType) to a pointer to the value type
1793// (VectorType).
1794static void EmitStoreOfMatrixScalar(llvm::Value *value, LValue lvalue,
1795 bool isInit, CodeGenFunction &CGF) {
1796 Address Addr = MaybeConvertMatrixAddress(lvalue.getAddress(CGF), CGF,
1797 value->getType()->isVectorTy());
1798 CGF.EmitStoreOfScalar(value, Addr, lvalue.isVolatile(), lvalue.getType(),
1799 lvalue.getBaseInfo(), lvalue.getTBAAInfo(), isInit,
1800 lvalue.isNontemporal());
1801}
1802
1803void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
1804 bool Volatile, QualType Ty,
1805 LValueBaseInfo BaseInfo,
1806 TBAAAccessInfo TBAAInfo,
1807 bool isInit, bool isNontemporal) {
1808 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1809 // Handle vectors differently to get better performance.
1810 if (Ty->isVectorType()) {
1811 llvm::Type *SrcTy = Value->getType();
1812 auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
1813 // Handle vec3 special.
1814 if (VecTy && cast<llvm::FixedVectorType>(VecTy)->getNumElements() == 3) {
1815 // Our source is a vec3, do a shuffle vector to make it a vec4.
1816 Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
1817 ArrayRef<int>{0, 1, 2, -1},
1818 "extractVec");
1819 SrcTy = llvm::FixedVectorType::get(VecTy->getElementType(), 4);
1820 }
1821 if (Addr.getElementType() != SrcTy) {
1822 Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
1823 }
1824 }
1825 }
1826
1827 Value = EmitToMemory(Value, Ty);
1828
1829 LValue AtomicLValue =
1830 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1831 if (Ty->isAtomicType() ||
1832 (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
1833 EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
1834 return;
1835 }
1836
1837 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1838 if (isNontemporal) {
1839 llvm::MDNode *Node =
1840 llvm::MDNode::get(Store->getContext(),
1841 llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1842 Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1843 }
1844
1845 CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
1846}
1847
1848void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1849 bool isInit) {
1850 if (lvalue.getType()->isConstantMatrixType()) {
1851 EmitStoreOfMatrixScalar(value, lvalue, isInit, *this);
1852 return;
1853 }
1854
1855 EmitStoreOfScalar(value, lvalue.getAddress(*this), lvalue.isVolatile(),
1856 lvalue.getType(), lvalue.getBaseInfo(),
1857 lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1858}
1859
1860// Emit a load of a LValue of matrix type. This may require casting the pointer
1861// to memory address (ArrayType) to a pointer to the value type (VectorType).
1862static RValue EmitLoadOfMatrixLValue(LValue LV, SourceLocation Loc,
1863 CodeGenFunction &CGF) {
1864 assert(LV.getType()->isConstantMatrixType())((LV.getType()->isConstantMatrixType()) ? static_cast<void
> (0) : __assert_fail ("LV.getType()->isConstantMatrixType()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1864, __PRETTY_FUNCTION__))
;
1865 Address Addr = MaybeConvertMatrixAddress(LV.getAddress(CGF), CGF);
1866 LV.setAddress(Addr);
1867 return RValue::get(CGF.EmitLoadOfScalar(LV, Loc));
1868}
1869
1870/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1871/// method emits the address of the lvalue, then loads the result as an rvalue,
1872/// returning the rvalue.
1873RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1874 if (LV.isObjCWeak()) {
1875 // load of a __weak object.
1876 Address AddrWeakObj = LV.getAddress(*this);
1877 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1878 AddrWeakObj));
1879 }
1880 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1881 // In MRC mode, we do a load+autorelease.
1882 if (!getLangOpts().ObjCAutoRefCount) {
1883 return RValue::get(EmitARCLoadWeak(LV.getAddress(*this)));
1884 }
1885
1886 // In ARC mode, we load retained and then consume the value.
1887 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress(*this));
1888 Object = EmitObjCConsumeObject(LV.getType(), Object);
1889 return RValue::get(Object);
1890 }
1891
1892 if (LV.isSimple()) {
1893 assert(!LV.getType()->isFunctionType())((!LV.getType()->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("!LV.getType()->isFunctionType()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1893, __PRETTY_FUNCTION__))
;
1894
1895 if (LV.getType()->isConstantMatrixType())
1896 return EmitLoadOfMatrixLValue(LV, Loc, *this);
1897
1898 // Everything needs a load.
1899 return RValue::get(EmitLoadOfScalar(LV, Loc));
1900 }
1901
1902 if (LV.isVectorElt()) {
1903 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
1904 LV.isVolatileQualified());
1905 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1906 "vecext"));
1907 }
1908
1909 // If this is a reference to a subset of the elements of a vector, either
1910 // shuffle the input or extract/insert them as appropriate.
1911 if (LV.isExtVectorElt()) {
1912 return EmitLoadOfExtVectorElementLValue(LV);
1913 }
1914
1915 // Global Register variables always invoke intrinsics
1916 if (LV.isGlobalReg())
1917 return EmitLoadOfGlobalRegLValue(LV);
1918
1919 if (LV.isMatrixElt()) {
1920 llvm::LoadInst *Load =
1921 Builder.CreateLoad(LV.getMatrixAddress(), LV.isVolatileQualified());
1922 return RValue::get(
1923 Builder.CreateExtractElement(Load, LV.getMatrixIdx(), "matrixext"));
1924 }
1925
1926 assert(LV.isBitField() && "Unknown LValue type!")((LV.isBitField() && "Unknown LValue type!") ? static_cast
<void> (0) : __assert_fail ("LV.isBitField() && \"Unknown LValue type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1926, __PRETTY_FUNCTION__))
;
1927 return EmitLoadOfBitfieldLValue(LV, Loc);
1928}
1929
1930RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
1931 SourceLocation Loc) {
1932 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1933
1934 // Get the output type.
1935 llvm::Type *ResLTy = ConvertType(LV.getType());
1936
1937 Address Ptr = LV.getBitFieldAddress();
1938 llvm::Value *Val =
1939 Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
1940
1941 bool UseVolatile = LV.isVolatileQualified() &&
1942 Info.VolatileStorageSize != 0 && isAAPCS(CGM.getTarget());
1943 const unsigned Offset = UseVolatile ? Info.VolatileOffset : Info.Offset;
1944 const unsigned StorageSize =
1945 UseVolatile ? Info.VolatileStorageSize : Info.StorageSize;
1946 if (Info.IsSigned) {
1947 assert(static_cast<unsigned>(Offset + Info.Size) <= StorageSize)((static_cast<unsigned>(Offset + Info.Size) <= StorageSize
) ? static_cast<void> (0) : __assert_fail ("static_cast<unsigned>(Offset + Info.Size) <= StorageSize"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 1947, __PRETTY_FUNCTION__))
;
1948 unsigned HighBits = StorageSize - Offset - Info.Size;
1949 if (HighBits)
1950 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1951 if (Offset + HighBits)
1952 Val = Builder.CreateAShr(Val, Offset + HighBits, "bf.ashr");
1953 } else {
1954 if (Offset)
1955 Val = Builder.CreateLShr(Val, Offset, "bf.lshr");
1956 if (static_cast<unsigned>(Offset) + Info.Size < StorageSize)
1957 Val = Builder.CreateAnd(
1958 Val, llvm::APInt::getLowBitsSet(StorageSize, Info.Size), "bf.clear");
1959 }
1960 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1961 EmitScalarRangeCheck(Val, LV.getType(), Loc);
1962 return RValue::get(Val);
1963}
1964
1965// If this is a reference to a subset of the elements of a vector, create an
1966// appropriate shufflevector.
1967RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1968 llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
1969 LV.isVolatileQualified());
1970
1971 const llvm::Constant *Elts = LV.getExtVectorElts();
1972
1973 // If the result of the expression is a non-vector type, we must be extracting
1974 // a single element. Just codegen as an extractelement.
1975 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1976 if (!ExprVT) {
1977 unsigned InIdx = getAccessedFieldNo(0, Elts);
1978 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1979 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1980 }
1981
1982 // Always use shuffle vector to try to retain the original program structure
1983 unsigned NumResultElts = ExprVT->getNumElements();
1984
1985 SmallVector<int, 4> Mask;
1986 for (unsigned i = 0; i != NumResultElts; ++i)
1987 Mask.push_back(getAccessedFieldNo(i, Elts));
1988
1989 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1990 Mask);
1991 return RValue::get(Vec);
1992}
1993
1994/// Generates lvalue for partial ext_vector access.
1995Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1996 Address VectorAddress = LV.getExtVectorAddress();
1997 QualType EQT = LV.getType()->castAs<VectorType>()->getElementType();
1998 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1999
2000 Address CastToPointerElement =
2001 Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
2002 "conv.ptr.element");
2003
2004 const llvm::Constant *Elts = LV.getExtVectorElts();
2005 unsigned ix = getAccessedFieldNo(0, Elts);
2006
2007 Address VectorBasePtrPlusIx =
2008 Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
2009 "vector.elt");
2010
2011 return VectorBasePtrPlusIx;
2012}
2013
2014/// Load of global gamed gegisters are always calls to intrinsics.
2015RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
2016 assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2017, __PRETTY_FUNCTION__))
2017 "Bad type for register variable")(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2017, __PRETTY_FUNCTION__))
;
2018 llvm::MDNode *RegName = cast<llvm::MDNode>(
2019 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
2020
2021 // We accept integer and pointer types only
2022 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
2023 llvm::Type *Ty = OrigTy;
2024 if (OrigTy->isPointerTy())
2025 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2026 llvm::Type *Types[] = { Ty };
2027
2028 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
2029 llvm::Value *Call = Builder.CreateCall(
2030 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
2031 if (OrigTy->isPointerTy())
2032 Call = Builder.CreateIntToPtr(Call, OrigTy);
2033 return RValue::get(Call);
2034}
2035
2036/// EmitStoreThroughLValue - Store the specified rvalue into the specified
2037/// lvalue, where both are guaranteed to the have the same type, and that type
2038/// is 'Ty'.
2039void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
2040 bool isInit) {
2041 if (!Dst.isSimple()) {
2042 if (Dst.isVectorElt()) {
2043 // Read/modify/write the vector, inserting the new element.
2044 llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
2045 Dst.isVolatileQualified());
2046 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
2047 Dst.getVectorIdx(), "vecins");
2048 Builder.CreateStore(Vec, Dst.getVectorAddress(),
2049 Dst.isVolatileQualified());
2050 return;
2051 }
2052
2053 // If this is an update of extended vector elements, insert them as
2054 // appropriate.
2055 if (Dst.isExtVectorElt())
2056 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
2057
2058 if (Dst.isGlobalReg())
2059 return EmitStoreThroughGlobalRegLValue(Src, Dst);
2060
2061 if (Dst.isMatrixElt()) {
2062 llvm::Value *Vec = Builder.CreateLoad(Dst.getMatrixAddress());
2063 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
2064 Dst.getMatrixIdx(), "matins");
2065 Builder.CreateStore(Vec, Dst.getMatrixAddress(),
2066 Dst.isVolatileQualified());
2067 return;
2068 }
2069
2070 assert(Dst.isBitField() && "Unknown LValue type")((Dst.isBitField() && "Unknown LValue type") ? static_cast
<void> (0) : __assert_fail ("Dst.isBitField() && \"Unknown LValue type\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2070, __PRETTY_FUNCTION__))
;
2071 return EmitStoreThroughBitfieldLValue(Src, Dst);
2072 }
2073
2074 // There's special magic for assigning into an ARC-qualified l-value.
2075 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
2076 switch (Lifetime) {
2077 case Qualifiers::OCL_None:
2078 llvm_unreachable("present but none")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2078)
;
2079
2080 case Qualifiers::OCL_ExplicitNone:
2081 // nothing special
2082 break;
2083
2084 case Qualifiers::OCL_Strong:
2085 if (isInit) {
2086 Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
2087 break;
2088 }
2089 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
2090 return;
2091
2092 case Qualifiers::OCL_Weak:
2093 if (isInit)
2094 // Initialize and then skip the primitive store.
2095 EmitARCInitWeak(Dst.getAddress(*this), Src.getScalarVal());
2096 else
2097 EmitARCStoreWeak(Dst.getAddress(*this), Src.getScalarVal(),
2098 /*ignore*/ true);
2099 return;
2100
2101 case Qualifiers::OCL_Autoreleasing:
2102 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
2103 Src.getScalarVal()));
2104 // fall into the normal path
2105 break;
2106 }
2107 }
2108
2109 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
2110 // load of a __weak object.
2111 Address LvalueDst = Dst.getAddress(*this);
2112 llvm::Value *src = Src.getScalarVal();
2113 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
2114 return;
2115 }
2116
2117 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
2118 // load of a __strong object.
2119 Address LvalueDst = Dst.getAddress(*this);
2120 llvm::Value *src = Src.getScalarVal();
2121 if (Dst.isObjCIvar()) {
2122 assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL")((Dst.getBaseIvarExp() && "BaseIvarExp is NULL") ? static_cast
<void> (0) : __assert_fail ("Dst.getBaseIvarExp() && \"BaseIvarExp is NULL\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2122, __PRETTY_FUNCTION__))
;
2123 llvm::Type *ResultType = IntPtrTy;
2124 Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
2125 llvm::Value *RHS = dst.getPointer();
2126 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
2127 llvm::Value *LHS =
2128 Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
2129 "sub.ptr.lhs.cast");
2130 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
2131 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
2132 BytesBetween);
2133 } else if (Dst.isGlobalObjCRef()) {
2134 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
2135 Dst.isThreadLocalRef());
2136 }
2137 else
2138 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
2139 return;
2140 }
2141
2142 assert(Src.isScalar() && "Can't emit an agg store with this method")((Src.isScalar() && "Can't emit an agg store with this method"
) ? static_cast<void> (0) : __assert_fail ("Src.isScalar() && \"Can't emit an agg store with this method\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2142, __PRETTY_FUNCTION__))
;
2143 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
2144}
2145
2146void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
2147 llvm::Value **Result) {
2148 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
2149 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
2150 Address Ptr = Dst.getBitFieldAddress();
2151
2152 // Get the source value, truncated to the width of the bit-field.
2153 llvm::Value *SrcVal = Src.getScalarVal();
2154
2155 // Cast the source to the storage type and shift it into place.
2156 SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
2157 /*isSigned=*/false);
2158 llvm::Value *MaskedVal = SrcVal;
2159
2160 const bool UseVolatile =
2161 CGM.getCodeGenOpts().AAPCSBitfieldWidth && Dst.isVolatileQualified() &&
2162 Info.VolatileStorageSize != 0 && isAAPCS(CGM.getTarget());
2163 const unsigned StorageSize =
2164 UseVolatile ? Info.VolatileStorageSize : Info.StorageSize;
2165 const unsigned Offset = UseVolatile ? Info.VolatileOffset : Info.Offset;
2166 // See if there are other bits in the bitfield's storage we'll need to load
2167 // and mask together with source before storing.
2168 if (StorageSize != Info.Size) {
2169 assert(StorageSize > Info.Size && "Invalid bitfield size.")((StorageSize > Info.Size && "Invalid bitfield size."
) ? static_cast<void> (0) : __assert_fail ("StorageSize > Info.Size && \"Invalid bitfield size.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2169, __PRETTY_FUNCTION__))
;
2170 llvm::Value *Val =
2171 Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
2172
2173 // Mask the source value as needed.
2174 if (!hasBooleanRepresentation(Dst.getType()))
2175 SrcVal = Builder.CreateAnd(
2176 SrcVal, llvm::APInt::getLowBitsSet(StorageSize, Info.Size),
2177 "bf.value");
2178 MaskedVal = SrcVal;
2179 if (Offset)
2180 SrcVal = Builder.CreateShl(SrcVal, Offset, "bf.shl");
2181
2182 // Mask out the original value.
2183 Val = Builder.CreateAnd(
2184 Val, ~llvm::APInt::getBitsSet(StorageSize, Offset, Offset + Info.Size),
2185 "bf.clear");
2186
2187 // Or together the unchanged values and the source value.
2188 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
2189 } else {
2190 assert(Offset == 0)((Offset == 0) ? static_cast<void> (0) : __assert_fail (
"Offset == 0", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2190, __PRETTY_FUNCTION__))
;
2191 // According to the AACPS:
2192 // When a volatile bit-field is written, and its container does not overlap
2193 // with any non-bit-field member, its container must be read exactly once
2194 // and written exactly once using the access width appropriate to the type
2195 // of the container. The two accesses are not atomic.
2196 if (Dst.isVolatileQualified() && isAAPCS(CGM.getTarget()) &&
2197 CGM.getCodeGenOpts().ForceAAPCSBitfieldLoad)
2198 Builder.CreateLoad(Ptr, true, "bf.load");
2199 }
2200
2201 // Write the new value back out.
2202 Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
2203
2204 // Return the new value of the bit-field, if requested.
2205 if (Result) {
2206 llvm::Value *ResultVal = MaskedVal;
2207
2208 // Sign extend the value if needed.
2209 if (Info.IsSigned) {
2210 assert(Info.Size <= StorageSize)((Info.Size <= StorageSize) ? static_cast<void> (0) :
__assert_fail ("Info.Size <= StorageSize", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2210, __PRETTY_FUNCTION__))
;
2211 unsigned HighBits = StorageSize - Info.Size;
2212 if (HighBits) {
2213 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
2214 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
2215 }
2216 }
2217
2218 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
2219 "bf.result.cast");
2220 *Result = EmitFromMemory(ResultVal, Dst.getType());
2221 }
2222}
2223
2224void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
2225 LValue Dst) {
2226 // This access turns into a read/modify/write of the vector. Load the input
2227 // value now.
2228 llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
2229 Dst.isVolatileQualified());
2230 const llvm::Constant *Elts = Dst.getExtVectorElts();
2231
2232 llvm::Value *SrcVal = Src.getScalarVal();
2233
2234 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
2235 unsigned NumSrcElts = VTy->getNumElements();
2236 unsigned NumDstElts =
2237 cast<llvm::FixedVectorType>(Vec->getType())->getNumElements();
2238 if (NumDstElts == NumSrcElts) {
2239 // Use shuffle vector is the src and destination are the same number of
2240 // elements and restore the vector mask since it is on the side it will be
2241 // stored.
2242 SmallVector<int, 4> Mask(NumDstElts);
2243 for (unsigned i = 0; i != NumSrcElts; ++i)
2244 Mask[getAccessedFieldNo(i, Elts)] = i;
2245
2246 Vec = Builder.CreateShuffleVector(
2247 SrcVal, llvm::UndefValue::get(Vec->getType()), Mask);
2248 } else if (NumDstElts > NumSrcElts) {
2249 // Extended the source vector to the same length and then shuffle it
2250 // into the destination.
2251 // FIXME: since we're shuffling with undef, can we just use the indices
2252 // into that? This could be simpler.
2253 SmallVector<int, 4> ExtMask;
2254 for (unsigned i = 0; i != NumSrcElts; ++i)
2255 ExtMask.push_back(i);
2256 ExtMask.resize(NumDstElts, -1);
2257 llvm::Value *ExtSrcVal = Builder.CreateShuffleVector(
2258 SrcVal, llvm::UndefValue::get(SrcVal->getType()), ExtMask);
2259 // build identity
2260 SmallVector<int, 4> Mask;
2261 for (unsigned i = 0; i != NumDstElts; ++i)
2262 Mask.push_back(i);
2263
2264 // When the vector size is odd and .odd or .hi is used, the last element
2265 // of the Elts constant array will be one past the size of the vector.
2266 // Ignore the last element here, if it is greater than the mask size.
2267 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
2268 NumSrcElts--;
2269
2270 // modify when what gets shuffled in
2271 for (unsigned i = 0; i != NumSrcElts; ++i)
2272 Mask[getAccessedFieldNo(i, Elts)] = i + NumDstElts;
2273 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, Mask);
2274 } else {
2275 // We should never shorten the vector
2276 llvm_unreachable("unexpected shorten vector length")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2276)
;
2277 }
2278 } else {
2279 // If the Src is a scalar (not a vector) it must be updating one element.
2280 unsigned InIdx = getAccessedFieldNo(0, Elts);
2281 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
2282 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
2283 }
2284
2285 Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
2286 Dst.isVolatileQualified());
2287}
2288
2289/// Store of global named registers are always calls to intrinsics.
2290void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
2291 assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2292, __PRETTY_FUNCTION__))
2292 "Bad type for register variable")(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2292, __PRETTY_FUNCTION__))
;
2293 llvm::MDNode *RegName = cast<llvm::MDNode>(
2294 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
2295 assert(RegName && "Register LValue is not metadata")((RegName && "Register LValue is not metadata") ? static_cast
<void> (0) : __assert_fail ("RegName && \"Register LValue is not metadata\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2295, __PRETTY_FUNCTION__))
;
2296
2297 // We accept integer and pointer types only
2298 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
2299 llvm::Type *Ty = OrigTy;
2300 if (OrigTy->isPointerTy())
2301 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2302 llvm::Type *Types[] = { Ty };
2303
2304 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
2305 llvm::Value *Value = Src.getScalarVal();
2306 if (OrigTy->isPointerTy())
2307 Value = Builder.CreatePtrToInt(Value, Ty);
2308 Builder.CreateCall(
2309 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
2310}
2311
2312// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2313// generating write-barries API. It is currently a global, ivar,
2314// or neither.
2315static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
2316 LValue &LV,
2317 bool IsMemberAccess=false) {
2318 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
2319 return;
2320
2321 if (isa<ObjCIvarRefExpr>(E)) {
2322 QualType ExpTy = E->getType();
2323 if (IsMemberAccess && ExpTy->isPointerType()) {
2324 // If ivar is a structure pointer, assigning to field of
2325 // this struct follows gcc's behavior and makes it a non-ivar
2326 // writer-barrier conservatively.
2327 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2328 if (ExpTy->isRecordType()) {
2329 LV.setObjCIvar(false);
2330 return;
2331 }
2332 }
2333 LV.setObjCIvar(true);
2334 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
2335 LV.setBaseIvarExp(Exp->getBase());
2336 LV.setObjCArray(E->getType()->isArrayType());
2337 return;
2338 }
2339
2340 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
2341 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
2342 if (VD->hasGlobalStorage()) {
2343 LV.setGlobalObjCRef(true);
2344 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
2345 }
2346 }
2347 LV.setObjCArray(E->getType()->isArrayType());
2348 return;
2349 }
2350
2351 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
2352 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2353 return;
2354 }
2355
2356 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
2357 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2358 if (LV.isObjCIvar()) {
2359 // If cast is to a structure pointer, follow gcc's behavior and make it
2360 // a non-ivar write-barrier.
2361 QualType ExpTy = E->getType();
2362 if (ExpTy->isPointerType())
2363 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2364 if (ExpTy->isRecordType())
2365 LV.setObjCIvar(false);
2366 }
2367 return;
2368 }
2369
2370 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
2371 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
2372 return;
2373 }
2374
2375 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
2376 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2377 return;
2378 }
2379
2380 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
2381 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2382 return;
2383 }
2384
2385 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
2386 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2387 return;
2388 }
2389
2390 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
2391 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
2392 if (LV.isObjCIvar() && !LV.isObjCArray())
2393 // Using array syntax to assigning to what an ivar points to is not
2394 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
2395 LV.setObjCIvar(false);
2396 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
2397 // Using array syntax to assigning to what global points to is not
2398 // same as assigning to the global itself. {id *G;} G[i] = 0;
2399 LV.setGlobalObjCRef(false);
2400 return;
2401 }
2402
2403 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
2404 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
2405 // We don't know if member is an 'ivar', but this flag is looked at
2406 // only in the context of LV.isObjCIvar().
2407 LV.setObjCArray(E->getType()->isArrayType());
2408 return;
2409 }
2410}
2411
2412static llvm::Value *
2413EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
2414 llvm::Value *V, llvm::Type *IRType,
2415 StringRef Name = StringRef()) {
2416 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2417 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
2418}
2419
2420static LValue EmitThreadPrivateVarDeclLValue(
2421 CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
2422 llvm::Type *RealVarTy, SourceLocation Loc) {
2423 if (CGF.CGM.getLangOpts().OpenMPIRBuilder)
2424 Addr = CodeGenFunction::OMPBuilderCBHelpers::getAddrOfThreadPrivate(
2425 CGF, VD, Addr, Loc);
2426 else
2427 Addr =
2428 CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
2429
2430 Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
2431 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2432}
2433
2434static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
2435 const VarDecl *VD, QualType T) {
2436 llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
2437 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
2438 // Return an invalid address if variable is MT_To and unified
2439 // memory is not enabled. For all other cases: MT_Link and
2440 // MT_To with unified memory, return a valid address.
2441 if (!Res || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
2442 !CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory()))
2443 return Address::invalid();
2444 assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2447, __PRETTY_FUNCTION__))
2445 (*Res == OMPDeclareTargetDeclAttr::MT_To &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2447, __PRETTY_FUNCTION__))
2446 CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2447, __PRETTY_FUNCTION__))
2447 "Expected link clause OR to clause with unified memory enabled.")((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2447, __PRETTY_FUNCTION__))
;
2448 QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
2449 Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
2450 return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2451}
2452
2453Address
2454CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
2455 LValueBaseInfo *PointeeBaseInfo,
2456 TBAAAccessInfo *PointeeTBAAInfo) {
2457 llvm::LoadInst *Load =
2458 Builder.CreateLoad(RefLVal.getAddress(*this), RefLVal.isVolatile());
2459 CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
2460
2461 CharUnits Align = CGM.getNaturalTypeAlignment(
2462 RefLVal.getType()->getPointeeType(), PointeeBaseInfo, PointeeTBAAInfo,
2463 /* forPointeeType= */ true);
2464 return Address(Load, Align);
2465}
2466
2467LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
2468 LValueBaseInfo PointeeBaseInfo;
2469 TBAAAccessInfo PointeeTBAAInfo;
2470 Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
2471 &PointeeTBAAInfo);
2472 return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
2473 PointeeBaseInfo, PointeeTBAAInfo);
2474}
2475
2476Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
2477 const PointerType *PtrTy,
2478 LValueBaseInfo *BaseInfo,
2479 TBAAAccessInfo *TBAAInfo) {
2480 llvm::Value *Addr = Builder.CreateLoad(Ptr);
2481 return Address(Addr, CGM.getNaturalTypeAlignment(PtrTy->getPointeeType(),
2482 BaseInfo, TBAAInfo,
2483 /*forPointeeType=*/true));
2484}
2485
2486LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
2487 const PointerType *PtrTy) {
2488 LValueBaseInfo BaseInfo;
2489 TBAAAccessInfo TBAAInfo;
2490 Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
2491 return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
2492}
2493
2494static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
2495 const Expr *E, const VarDecl *VD) {
2496 QualType T = E->getType();
2497
2498 // If it's thread_local, emit a call to its wrapper function instead.
2499 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
2500 CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
2501 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
2502 // Check if the variable is marked as declare target with link clause in
2503 // device codegen.
2504 if (CGF.getLangOpts().OpenMPIsDevice) {
2505 Address Addr = emitDeclTargetVarDeclLValue(CGF, VD, T);
2506 if (Addr.isValid())
2507 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2508 }
2509
2510 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2511 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2512 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
2513 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2514 Address Addr(V, Alignment);
2515 // Emit reference to the private copy of the variable if it is an OpenMP
2516 // threadprivate variable.
2517 if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
2518 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2519 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
2520 E->getExprLoc());
2521 }
2522 LValue LV = VD->getType()->isReferenceType() ?
2523 CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2524 AlignmentSource::Decl) :
2525 CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2526 setObjCGCLValueClass(CGF.getContext(), E, LV);
2527 return LV;
2528}
2529
2530static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
2531 GlobalDecl GD) {
2532 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2533 if (FD->hasAttr<WeakRefAttr>()) {
2534 ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
2535 return aliasee.getPointer();
2536 }
2537
2538 llvm::Constant *V = CGM.GetAddrOfFunction(GD);
2539 if (!FD->hasPrototype()) {
2540 if (const FunctionProtoType *Proto =
2541 FD->getType()->getAs<FunctionProtoType>()) {
2542 // Ugly case: for a K&R-style definition, the type of the definition
2543 // isn't the same as the type of a use. Correct for this with a
2544 // bitcast.
2545 QualType NoProtoType =
2546 CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
2547 NoProtoType = CGM.getContext().getPointerType(NoProtoType);
2548 V = llvm::ConstantExpr::getBitCast(V,
2549 CGM.getTypes().ConvertType(NoProtoType));
2550 }
2551 }
2552 return V;
2553}
2554
2555static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF, const Expr *E,
2556 GlobalDecl GD) {
2557 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2558 llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, GD);
2559 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
2560 return CGF.MakeAddrLValue(V, E->getType(), Alignment,
2561 AlignmentSource::Decl);
2562}
2563
2564static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
2565 llvm::Value *ThisValue) {
2566 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
2567 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
2568 return CGF.EmitLValueForField(LV, FD);
2569}
2570
2571/// Named Registers are named metadata pointing to the register name
2572/// which will be read from/written to as an argument to the intrinsic
2573/// @llvm.read/write_register.
2574/// So far, only the name is being passed down, but other options such as
2575/// register type, allocation type or even optimization options could be
2576/// passed down via the metadata node.
2577static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
2578 SmallString<64> Name("llvm.named.register.");
2579 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
2580 assert(Asm->getLabel().size() < 64-Name.size() &&((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2581, __PRETTY_FUNCTION__))
2581 "Register name too big")((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2581, __PRETTY_FUNCTION__))
;
2582 Name.append(Asm->getLabel());
2583 llvm::NamedMDNode *M =
2584 CGM.getModule().getOrInsertNamedMetadata(Name);
2585 if (M->getNumOperands() == 0) {
2586 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
2587 Asm->getLabel());
2588 llvm::Metadata *Ops[] = {Str};
2589 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
2590 }
2591
2592 CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
2593
2594 llvm::Value *Ptr =
2595 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
2596 return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
2597}
2598
2599/// Determine whether we can emit a reference to \p VD from the current
2600/// context, despite not necessarily having seen an odr-use of the variable in
2601/// this context.
2602static bool canEmitSpuriousReferenceToVariable(CodeGenFunction &CGF,
2603 const DeclRefExpr *E,
2604 const VarDecl *VD,
2605 bool IsConstant) {
2606 // For a variable declared in an enclosing scope, do not emit a spurious
2607 // reference even if we have a capture, as that will emit an unwarranted
2608 // reference to our capture state, and will likely generate worse code than
2609 // emitting a local copy.
2610 if (E->refersToEnclosingVariableOrCapture())
2611 return false;
2612
2613 // For a local declaration declared in this function, we can always reference
2614 // it even if we don't have an odr-use.
2615 if (VD->hasLocalStorage()) {
2616 return VD->getDeclContext() ==
2617 dyn_cast_or_null<DeclContext>(CGF.CurCodeDecl);
2618 }
2619
2620 // For a global declaration, we can emit a reference to it if we know
2621 // for sure that we are able to emit a definition of it.
2622 VD = VD->getDefinition(CGF.getContext());
2623 if (!VD)
2624 return false;
2625
2626 // Don't emit a spurious reference if it might be to a variable that only
2627 // exists on a different device / target.
2628 // FIXME: This is unnecessarily broad. Check whether this would actually be a
2629 // cross-target reference.
2630 if (CGF.getLangOpts().OpenMP || CGF.getLangOpts().CUDA ||
2631 CGF.getLangOpts().OpenCL) {
2632 return false;
2633 }
2634
2635 // We can emit a spurious reference only if the linkage implies that we'll
2636 // be emitting a non-interposable symbol that will be retained until link
2637 // time.
2638 switch (CGF.CGM.getLLVMLinkageVarDefinition(VD, IsConstant)) {
2639 case llvm::GlobalValue::ExternalLinkage:
2640 case llvm::GlobalValue::LinkOnceODRLinkage:
2641 case llvm::GlobalValue::WeakODRLinkage:
2642 case llvm::GlobalValue::InternalLinkage:
2643 case llvm::GlobalValue::PrivateLinkage:
2644 return true;
2645 default:
2646 return false;
2647 }
2648}
2649
2650LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
2651 const NamedDecl *ND = E->getDecl();
2652 QualType T = E->getType();
2653
2654 assert(E->isNonOdrUse() != NOUR_Unevaluated &&((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2655, __PRETTY_FUNCTION__))
2655 "should not emit an unevaluated operand")((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2655, __PRETTY_FUNCTION__))
;
2656
2657 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2658 // Global Named registers access via intrinsics only
2659 if (VD->getStorageClass() == SC_Register &&
2660 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
2661 return EmitGlobalNamedRegister(VD, CGM);
2662
2663 // If this DeclRefExpr does not constitute an odr-use of the variable,
2664 // we're not permitted to emit a reference to it in general, and it might
2665 // not be captured if capture would be necessary for a use. Emit the
2666 // constant value directly instead.
2667 if (E->isNonOdrUse() == NOUR_Constant &&
2668 (VD->getType()->isReferenceType() ||
2669 !canEmitSpuriousReferenceToVariable(*this, E, VD, true))) {
2670 VD->getAnyInitializer(VD);
2671 llvm::Constant *Val = ConstantEmitter(*this).emitAbstract(
2672 E->getLocation(), *VD->evaluateValue(), VD->getType());
2673 assert(Val && "failed to emit constant expression")((Val && "failed to emit constant expression") ? static_cast
<void> (0) : __assert_fail ("Val && \"failed to emit constant expression\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2673, __PRETTY_FUNCTION__))
;
2674
2675 Address Addr = Address::invalid();
2676 if (!VD->getType()->isReferenceType()) {
2677 // Spill the constant value to a global.
2678 Addr = CGM.createUnnamedGlobalFrom(*VD, Val,
2679 getContext().getDeclAlign(VD));
2680 llvm::Type *VarTy = getTypes().ConvertTypeForMem(VD->getType());
2681 auto *PTy = llvm::PointerType::get(
2682 VarTy, getContext().getTargetAddressSpace(VD->getType()));
2683 if (PTy != Addr.getType())
2684 Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, PTy);
2685 } else {
2686 // Should we be using the alignment of the constant pointer we emitted?
2687 CharUnits Alignment =
2688 CGM.getNaturalTypeAlignment(E->getType(),
2689 /* BaseInfo= */ nullptr,
2690 /* TBAAInfo= */ nullptr,
2691 /* forPointeeType= */ true);
2692 Addr = Address(Val, Alignment);
2693 }
2694 return MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2695 }
2696
2697 // FIXME: Handle other kinds of non-odr-use DeclRefExprs.
2698
2699 // Check for captured variables.
2700 if (E->refersToEnclosingVariableOrCapture()) {
2701 VD = VD->getCanonicalDecl();
2702 if (auto *FD = LambdaCaptureFields.lookup(VD))
2703 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
2704 if (CapturedStmtInfo) {
2705 auto I = LocalDeclMap.find(VD);
2706 if (I != LocalDeclMap.end()) {
2707 LValue CapLVal;
2708 if (VD->getType()->isReferenceType())
2709 CapLVal = EmitLoadOfReferenceLValue(I->second, VD->getType(),
2710 AlignmentSource::Decl);
2711 else
2712 CapLVal = MakeAddrLValue(I->second, T);
2713 // Mark lvalue as nontemporal if the variable is marked as nontemporal
2714 // in simd context.
2715 if (getLangOpts().OpenMP &&
2716 CGM.getOpenMPRuntime().isNontemporalDecl(VD))
2717 CapLVal.setNontemporal(/*Value=*/true);
2718 return CapLVal;
2719 }
2720 LValue CapLVal =
2721 EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
2722 CapturedStmtInfo->getContextValue());
2723 CapLVal = MakeAddrLValue(
2724 Address(CapLVal.getPointer(*this), getContext().getDeclAlign(VD)),
2725 CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
2726 CapLVal.getTBAAInfo());
2727 // Mark lvalue as nontemporal if the variable is marked as nontemporal
2728 // in simd context.
2729 if (getLangOpts().OpenMP &&
2730 CGM.getOpenMPRuntime().isNontemporalDecl(VD))
2731 CapLVal.setNontemporal(/*Value=*/true);
2732 return CapLVal;
2733 }
2734
2735 assert(isa<BlockDecl>(CurCodeDecl))((isa<BlockDecl>(CurCodeDecl)) ? static_cast<void>
(0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2735, __PRETTY_FUNCTION__))
;
2736 Address addr = GetAddrOfBlockDecl(VD);
2737 return MakeAddrLValue(addr, T, AlignmentSource::Decl);
2738 }
2739 }
2740
2741 // FIXME: We should be able to assert this for FunctionDecls as well!
2742 // FIXME: We should be able to assert this for all DeclRefExprs, not just
2743 // those with a valid source location.
2744 assert((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() ||(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2746, __PRETTY_FUNCTION__))
2745 !E->getLocation().isValid()) &&(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2746, __PRETTY_FUNCTION__))
2746 "Should not use decl without marking it used!")(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2746, __PRETTY_FUNCTION__))
;
2747
2748 if (ND->hasAttr<WeakRefAttr>()) {
2749 const auto *VD = cast<ValueDecl>(ND);
2750 ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
2751 return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
2752 }
2753
2754 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2755 // Check if this is a global variable.
2756 if (VD->hasLinkage() || VD->isStaticDataMember())
2757 return EmitGlobalVarDeclLValue(*this, E, VD);
2758
2759 Address addr = Address::invalid();
2760
2761 // The variable should generally be present in the local decl map.
2762 auto iter = LocalDeclMap.find(VD);
2763 if (iter != LocalDeclMap.end()) {
2764 addr = iter->second;
2765
2766 // Otherwise, it might be static local we haven't emitted yet for
2767 // some reason; most likely, because it's in an outer function.
2768 } else if (VD->isStaticLocal()) {
2769 addr = Address(CGM.getOrCreateStaticVarDecl(
2770 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false)),
2771 getContext().getDeclAlign(VD));
2772
2773 // No other cases for now.
2774 } else {
2775 llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?")::llvm::llvm_unreachable_internal("DeclRefExpr for Decl not entered in LocalDeclMap?"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2775)
;
2776 }
2777
2778
2779 // Check for OpenMP threadprivate variables.
2780 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
2781 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2782 return EmitThreadPrivateVarDeclLValue(
2783 *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
2784 E->getExprLoc());
2785 }
2786
2787 // Drill into block byref variables.
2788 bool isBlockByref = VD->isEscapingByref();
2789 if (isBlockByref) {
2790 addr = emitBlockByrefAddress(addr, VD);
2791 }
2792
2793 // Drill into reference types.
2794 LValue LV = VD->getType()->isReferenceType() ?
2795 EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
2796 MakeAddrLValue(addr, T, AlignmentSource::Decl);
2797
2798 bool isLocalStorage = VD->hasLocalStorage();
2799
2800 bool NonGCable = isLocalStorage &&
2801 !VD->getType()->isReferenceType() &&
2802 !isBlockByref;
2803 if (NonGCable) {
2804 LV.getQuals().removeObjCGCAttr();
2805 LV.setNonGC(true);
2806 }
2807
2808 bool isImpreciseLifetime =
2809 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2810 if (isImpreciseLifetime)
2811 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2812 setObjCGCLValueClass(getContext(), E, LV);
2813 return LV;
2814 }
2815
2816 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2817 return EmitFunctionDeclLValue(*this, E, FD);
2818
2819 // FIXME: While we're emitting a binding from an enclosing scope, all other
2820 // DeclRefExprs we see should be implicitly treated as if they also refer to
2821 // an enclosing scope.
2822 if (const auto *BD = dyn_cast<BindingDecl>(ND))
2823 return EmitLValue(BD->getBinding());
2824
2825 // We can form DeclRefExprs naming GUID declarations when reconstituting
2826 // non-type template parameters into expressions.
2827 if (const auto *GD = dyn_cast<MSGuidDecl>(ND))
2828 return MakeAddrLValue(CGM.GetAddrOfMSGuidDecl(GD), T,
2829 AlignmentSource::Decl);
2830
2831 if (const auto *TPO = dyn_cast<TemplateParamObjectDecl>(ND))
2832 return MakeAddrLValue(CGM.GetAddrOfTemplateParamObject(TPO), T,
2833 AlignmentSource::Decl);
2834
2835 llvm_unreachable("Unhandled DeclRefExpr")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2835)
;
2836}
2837
2838LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2839 // __extension__ doesn't affect lvalue-ness.
2840 if (E->getOpcode() == UO_Extension)
2841 return EmitLValue(E->getSubExpr());
2842
2843 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2844 switch (E->getOpcode()) {
2845 default: llvm_unreachable("Unknown unary operator lvalue!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2845)
;
2846 case UO_Deref: {
2847 QualType T = E->getSubExpr()->getType()->getPointeeType();
2848 assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type")((!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"CodeGenFunction::EmitUnaryOpLValue: Illegal type\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2848, __PRETTY_FUNCTION__))
;
2849
2850 LValueBaseInfo BaseInfo;
2851 TBAAAccessInfo TBAAInfo;
2852 Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
2853 &TBAAInfo);
2854 LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
2855 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2856
2857 // We should not generate __weak write barrier on indirect reference
2858 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2859 // But, we continue to generate __strong write barrier on indirect write
2860 // into a pointer to object.
2861 if (getLangOpts().ObjC &&
2862 getLangOpts().getGC() != LangOptions::NonGC &&
2863 LV.isObjCWeak())
2864 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2865 return LV;
2866 }
2867 case UO_Real:
2868 case UO_Imag: {
2869 LValue LV = EmitLValue(E->getSubExpr());
2870 assert(LV.isSimple() && "real/imag on non-ordinary l-value")((LV.isSimple() && "real/imag on non-ordinary l-value"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"real/imag on non-ordinary l-value\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2870, __PRETTY_FUNCTION__))
;
2871
2872 // __real is valid on scalars. This is a faster way of testing that.
2873 // __imag can only produce an rvalue on scalars.
2874 if (E->getOpcode() == UO_Real &&
2875 !LV.getAddress(*this).getElementType()->isStructTy()) {
2876 assert(E->getSubExpr()->getType()->isArithmeticType())((E->getSubExpr()->getType()->isArithmeticType()) ? static_cast
<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2876, __PRETTY_FUNCTION__))
;
2877 return LV;
2878 }
2879
2880 QualType T = ExprTy->castAs<ComplexType>()->getElementType();
2881
2882 Address Component =
2883 (E->getOpcode() == UO_Real
2884 ? emitAddrOfRealComponent(LV.getAddress(*this), LV.getType())
2885 : emitAddrOfImagComponent(LV.getAddress(*this), LV.getType()));
2886 LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
2887 CGM.getTBAAInfoForSubobject(LV, T));
2888 ElemLV.getQuals().addQualifiers(LV.getQuals());
2889 return ElemLV;
2890 }
2891 case UO_PreInc:
2892 case UO_PreDec: {
2893 LValue LV = EmitLValue(E->getSubExpr());
2894 bool isInc = E->getOpcode() == UO_PreInc;
2895
2896 if (E->getType()->isAnyComplexType())
2897 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2898 else
2899 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2900 return LV;
2901 }
2902 }
2903}
2904
2905LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2906 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2907 E->getType(), AlignmentSource::Decl);
2908}
2909
2910LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2911 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2912 E->getType(), AlignmentSource::Decl);
2913}
2914
2915LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2916 auto SL = E->getFunctionName();
2917 assert(SL != nullptr && "No StringLiteral name in PredefinedExpr")((SL != nullptr && "No StringLiteral name in PredefinedExpr"
) ? static_cast<void> (0) : __assert_fail ("SL != nullptr && \"No StringLiteral name in PredefinedExpr\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 2917, __PRETTY_FUNCTION__))
;
2918 StringRef FnName = CurFn->getName();
2919 if (FnName.startswith("\01"))
2920 FnName = FnName.substr(1);
2921 StringRef NameItems[] = {
2922 PredefinedExpr::getIdentKindName(E->getIdentKind()), FnName};
2923 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2924 if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
2925 std::string Name = std::string(SL->getString());
2926 if (!Name.empty()) {
2927 unsigned Discriminator =
2928 CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
2929 if (Discriminator)
2930 Name += "_" + Twine(Discriminator + 1).str();
2931 auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
2932 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2933 } else {
2934 auto C =
2935 CGM.GetAddrOfConstantCString(std::string(FnName), GVName.c_str());
2936 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2937 }
2938 }
2939 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2940 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2941}
2942
2943/// Emit a type description suitable for use by a runtime sanitizer library. The
2944/// format of a type descriptor is
2945///
2946/// \code
2947/// { i16 TypeKind, i16 TypeInfo }
2948/// \endcode
2949///
2950/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2951/// integer, 1 for a floating point value, and -1 for anything else.
2952llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2953 // Only emit each type's descriptor once.
2954 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2955 return C;
2956
2957 uint16_t TypeKind = -1;
2958 uint16_t TypeInfo = 0;
2959
2960 if (T->isIntegerType()) {
2961 TypeKind = 0;
2962 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2963 (T->isSignedIntegerType() ? 1 : 0);
2964 } else if (T->isFloatingType()) {
2965 TypeKind = 1;
2966 TypeInfo = getContext().getTypeSize(T);
2967 }
2968
2969 // Format the type name as if for a diagnostic, including quotes and
2970 // optionally an 'aka'.
2971 SmallString<32> Buffer;
2972 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2973 (intptr_t)T.getAsOpaquePtr(),
2974 StringRef(), StringRef(), None, Buffer,
2975 None);
2976
2977 llvm::Constant *Components[] = {
2978 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2979 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2980 };
2981 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2982
2983 auto *GV = new llvm::GlobalVariable(
2984 CGM.getModule(), Descriptor->getType(),
2985 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2986 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2987 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2988
2989 // Remember the descriptor for this type.
2990 CGM.setTypeDescriptorInMap(T, GV);
2991
2992 return GV;
2993}
2994
2995llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2996 llvm::Type *TargetTy = IntPtrTy;
2997
2998 if (V->getType() == TargetTy)
2999 return V;
3000
3001 // Floating-point types which fit into intptr_t are bitcast to integers
3002 // and then passed directly (after zero-extension, if necessary).
3003 if (V->getType()->isFloatingPointTy()) {
3004 unsigned Bits = V->getType()->getPrimitiveSizeInBits().getFixedSize();
3005 if (Bits <= TargetTy->getIntegerBitWidth())
3006 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
3007 Bits));
3008 }
3009
3010 // Integers which fit in intptr_t are zero-extended and passed directly.
3011 if (V->getType()->isIntegerTy() &&
3012 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
3013 return Builder.CreateZExt(V, TargetTy);
3014
3015 // Pointers are passed directly, everything else is passed by address.
3016 if (!V->getType()->isPointerTy()) {
3017 Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
3018 Builder.CreateStore(V, Ptr);
3019 V = Ptr.getPointer();
3020 }
3021 return Builder.CreatePtrToInt(V, TargetTy);
3022}
3023
3024/// Emit a representation of a SourceLocation for passing to a handler
3025/// in a sanitizer runtime library. The format for this data is:
3026/// \code
3027/// struct SourceLocation {
3028/// const char *Filename;
3029/// int32_t Line, Column;
3030/// };
3031/// \endcode
3032/// For an invalid SourceLocation, the Filename pointer is null.
3033llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
3034 llvm::Constant *Filename;
3035 int Line, Column;
3036
3037 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
3038 if (PLoc.isValid()) {
3039 StringRef FilenameString = PLoc.getFilename();
3040
3041 int PathComponentsToStrip =
3042 CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
3043 if (PathComponentsToStrip < 0) {
3044 assert(PathComponentsToStrip != INT_MIN)((PathComponentsToStrip != (-2147483647 -1)) ? static_cast<
void> (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3044, __PRETTY_FUNCTION__))
;
3045 int PathComponentsToKeep = -PathComponentsToStrip;
3046 auto I = llvm::sys::path::rbegin(FilenameString);
3047 auto E = llvm::sys::path::rend(FilenameString);
3048 while (I != E && --PathComponentsToKeep)
3049 ++I;
3050
3051 FilenameString = FilenameString.substr(I - E);
3052 } else if (PathComponentsToStrip > 0) {
3053 auto I = llvm::sys::path::begin(FilenameString);
3054 auto E = llvm::sys::path::end(FilenameString);
3055 while (I != E && PathComponentsToStrip--)
3056 ++I;
3057
3058 if (I != E)
3059 FilenameString =
3060 FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
3061 else
3062 FilenameString = llvm::sys::path::filename(FilenameString);
3063 }
3064
3065 auto FilenameGV =
3066 CGM.GetAddrOfConstantCString(std::string(FilenameString), ".src");
3067 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
3068 cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
3069 Filename = FilenameGV.getPointer();
3070 Line = PLoc.getLine();
3071 Column = PLoc.getColumn();
3072 } else {
3073 Filename = llvm::Constant::getNullValue(Int8PtrTy);
3074 Line = Column = 0;
3075 }
3076
3077 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
3078 Builder.getInt32(Column)};
3079
3080 return llvm::ConstantStruct::getAnon(Data);
3081}
3082
3083namespace {
3084/// Specify under what conditions this check can be recovered
3085enum class CheckRecoverableKind {
3086 /// Always terminate program execution if this check fails.
3087 Unrecoverable,
3088 /// Check supports recovering, runtime has both fatal (noreturn) and
3089 /// non-fatal handlers for this check.
3090 Recoverable,
3091 /// Runtime conditionally aborts, always need to support recovery.
3092 AlwaysRecoverable
3093};
3094}
3095
3096static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
3097 assert(Kind.countPopulation() == 1)((Kind.countPopulation() == 1) ? static_cast<void> (0) :
__assert_fail ("Kind.countPopulation() == 1", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3097, __PRETTY_FUNCTION__))
;
3098 if (Kind == SanitizerKind::Function || Kind == SanitizerKind::Vptr)
3099 return CheckRecoverableKind::AlwaysRecoverable;
3100 else if (Kind == SanitizerKind::Return || Kind == SanitizerKind::Unreachable)
3101 return CheckRecoverableKind::Unrecoverable;
3102 else
3103 return CheckRecoverableKind::Recoverable;
3104}
3105
3106namespace {
3107struct SanitizerHandlerInfo {
3108 char const *const Name;
3109 unsigned Version;
3110};
3111}
3112
3113const SanitizerHandlerInfo SanitizerHandlers[] = {
3114#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
3115 LIST_SANITIZER_CHECKSSANITIZER_CHECK(AddOverflow, add_overflow, 0) SANITIZER_CHECK
(BuiltinUnreachable, builtin_unreachable, 0) SANITIZER_CHECK(
CFICheckFail, cfi_check_fail, 0) SANITIZER_CHECK(DivremOverflow
, divrem_overflow, 0) SANITIZER_CHECK(DynamicTypeCacheMiss, dynamic_type_cache_miss
, 0) SANITIZER_CHECK(FloatCastOverflow, float_cast_overflow, 0
) SANITIZER_CHECK(FunctionTypeMismatch, function_type_mismatch
, 1) SANITIZER_CHECK(ImplicitConversion, implicit_conversion,
0) SANITIZER_CHECK(InvalidBuiltin, invalid_builtin, 0) SANITIZER_CHECK
(InvalidObjCCast, invalid_objc_cast, 0) SANITIZER_CHECK(LoadInvalidValue
, load_invalid_value, 0) SANITIZER_CHECK(MissingReturn, missing_return
, 0) SANITIZER_CHECK(MulOverflow, mul_overflow, 0) SANITIZER_CHECK
(NegateOverflow, negate_overflow, 0) SANITIZER_CHECK(NullabilityArg
, nullability_arg, 0) SANITIZER_CHECK(NullabilityReturn, nullability_return
, 1) SANITIZER_CHECK(NonnullArg, nonnull_arg, 0) SANITIZER_CHECK
(NonnullReturn, nonnull_return, 1) SANITIZER_CHECK(OutOfBounds
, out_of_bounds, 0) SANITIZER_CHECK(PointerOverflow, pointer_overflow
, 0) SANITIZER_CHECK(ShiftOutOfBounds, shift_out_of_bounds, 0
) SANITIZER_CHECK(SubOverflow, sub_overflow, 0) SANITIZER_CHECK
(TypeMismatch, type_mismatch, 1) SANITIZER_CHECK(AlignmentAssumption
, alignment_assumption, 0) SANITIZER_CHECK(VLABoundNotPositive
, vla_bound_not_positive, 0)
3116#undef SANITIZER_CHECK
3117};
3118
3119static void emitCheckHandlerCall(CodeGenFunction &CGF,
3120 llvm::FunctionType *FnType,
3121 ArrayRef<llvm::Value *> FnArgs,
3122 SanitizerHandler CheckHandler,
3123 CheckRecoverableKind RecoverKind, bool IsFatal,
3124 llvm::BasicBlock *ContBB) {
3125 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable)((IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable
) ? static_cast<void> (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3125, __PRETTY_FUNCTION__))
;
3126 Optional<ApplyDebugLocation> DL;
3127 if (!CGF.Builder.getCurrentDebugLocation()) {
3128 // Ensure that the call has at least an artificial debug location.
3129 DL.emplace(CGF, SourceLocation());
3130 }
3131 bool NeedsAbortSuffix =
3132 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
3133 bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
3134 const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
3135 const StringRef CheckName = CheckInfo.Name;
3136 std::string FnName = "__ubsan_handle_" + CheckName.str();
3137 if (CheckInfo.Version && !MinimalRuntime)
3138 FnName += "_v" + llvm::utostr(CheckInfo.Version);
3139 if (MinimalRuntime)
3140 FnName += "_minimal";
3141 if (NeedsAbortSuffix)
3142 FnName += "_abort";
3143 bool MayReturn =
3144 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
3145
3146 llvm::AttrBuilder B;
3147 if (!MayReturn) {
3148 B.addAttribute(llvm::Attribute::NoReturn)
3149 .addAttribute(llvm::Attribute::NoUnwind);
3150 }
3151 B.addAttribute(llvm::Attribute::UWTable);
3152
3153 llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
3154 FnType, FnName,
3155 llvm::AttributeList::get(CGF.getLLVMContext(),
3156 llvm::AttributeList::FunctionIndex, B),
3157 /*Local=*/true);
3158 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
3159 if (!MayReturn) {
3160 HandlerCall->setDoesNotReturn();
3161 CGF.Builder.CreateUnreachable();
3162 } else {
3163 CGF.Builder.CreateBr(ContBB);
3164 }
3165}
3166
3167void CodeGenFunction::EmitCheck(
3168 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
3169 SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
3170 ArrayRef<llvm::Value *> DynamicArgs) {
3171 assert(IsSanitizerScope)((IsSanitizerScope) ? static_cast<void> (0) : __assert_fail
("IsSanitizerScope", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3171, __PRETTY_FUNCTION__))
;
3172 assert(Checked.size() > 0)((Checked.size() > 0) ? static_cast<void> (0) : __assert_fail
("Checked.size() > 0", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3172, __PRETTY_FUNCTION__))
;
3173 assert(CheckHandler >= 0 &&((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
(0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3174, __PRETTY_FUNCTION__))
3174 size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers))((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
(0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3174, __PRETTY_FUNCTION__))
;
3175 const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
3176
3177 llvm::Value *FatalCond = nullptr;
3178 llvm::Value *RecoverableCond = nullptr;
3179 llvm::Value *TrapCond = nullptr;
3180 for (int i = 0, n = Checked.size(); i < n; ++i) {
3181 llvm::Value *Check = Checked[i].first;
3182 // -fsanitize-trap= overrides -fsanitize-recover=.
3183 llvm::Value *&Cond =
3184 CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
3185 ? TrapCond
3186 : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
3187 ? RecoverableCond
3188 : FatalCond;
3189 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
3190 }
3191
3192 if (TrapCond)
3193 EmitTrapCheck(TrapCond);
3194 if (!FatalCond && !RecoverableCond)
3195 return;
3196
3197 llvm::Value *JointCond;
3198 if (FatalCond && RecoverableCond)
3199 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
3200 else
3201 JointCond = FatalCond ? FatalCond : RecoverableCond;
3202 assert(JointCond)((JointCond) ? static_cast<void> (0) : __assert_fail ("JointCond"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3202, __PRETTY_FUNCTION__))
;
3203
3204 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
3205 assert(SanOpts.has(Checked[0].second))((SanOpts.has(Checked[0].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[0].second)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3205, __PRETTY_FUNCTION__))
;
3206#ifndef NDEBUG
3207 for (int i = 1, n = Checked.size(); i < n; ++i) {
3208 assert(RecoverKind == getRecoverableKind(Checked[i].second) &&((RecoverKind == getRecoverableKind(Checked[i].second) &&
"All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3209, __PRETTY_FUNCTION__))
3209 "All recoverable kinds in a single check must be same!")((RecoverKind == getRecoverableKind(Checked[i].second) &&
"All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3209, __PRETTY_FUNCTION__))
;
3210 assert(SanOpts.has(Checked[i].second))((SanOpts.has(Checked[i].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[i].second)", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3210, __PRETTY_FUNCTION__))
;
3211 }
3212#endif
3213
3214 llvm::BasicBlock *Cont = createBasicBlock("cont");
3215 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
3216 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
3217 // Give hint that we very much don't expect to execute the handler
3218 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
3219 llvm::MDBuilder MDHelper(getLLVMContext());
3220 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3221 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
3222 EmitBlock(Handlers);
3223
3224 // Handler functions take an i8* pointing to the (handler-specific) static
3225 // information block, followed by a sequence of intptr_t arguments
3226 // representing operand values.
3227 SmallVector<llvm::Value *, 4> Args;
3228 SmallVector<llvm::Type *, 4> ArgTypes;
3229 if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
3230 Args.reserve(DynamicArgs.size() + 1);
3231 ArgTypes.reserve(DynamicArgs.size() + 1);
3232
3233 // Emit handler arguments and create handler function type.
3234 if (!StaticArgs.empty()) {
3235 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3236 auto *InfoPtr =
3237 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3238 llvm::GlobalVariable::PrivateLinkage, Info);
3239 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3240 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3241 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
3242 ArgTypes.push_back(Int8PtrTy);
3243 }
3244
3245 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
3246 Args.push_back(EmitCheckValue(DynamicArgs[i]));
3247 ArgTypes.push_back(IntPtrTy);
3248 }
3249 }
3250
3251 llvm::FunctionType *FnType =
3252 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
3253
3254 if (!FatalCond || !RecoverableCond) {
3255 // Simple case: we need to generate a single handler call, either
3256 // fatal, or non-fatal.
3257 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
3258 (FatalCond != nullptr), Cont);
3259 } else {
3260 // Emit two handler calls: first one for set of unrecoverable checks,
3261 // another one for recoverable.
3262 llvm::BasicBlock *NonFatalHandlerBB =
3263 createBasicBlock("non_fatal." + CheckName);
3264 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
3265 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
3266 EmitBlock(FatalHandlerBB);
3267 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
3268 NonFatalHandlerBB);
3269 EmitBlock(NonFatalHandlerBB);
3270 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
3271 Cont);
3272 }
3273
3274 EmitBlock(Cont);
3275}
3276
3277void CodeGenFunction::EmitCfiSlowPathCheck(
3278 SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
3279 llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
3280 llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
3281
3282 llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
3283 llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
3284
3285 llvm::MDBuilder MDHelper(getLLVMContext());
3286 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3287 BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
3288
3289 EmitBlock(CheckBB);
3290
3291 bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
3292
3293 llvm::CallInst *CheckCall;
3294 llvm::FunctionCallee SlowPathFn;
3295 if (WithDiag) {
3296 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3297 auto *InfoPtr =
3298 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3299 llvm::GlobalVariable::PrivateLinkage, Info);
3300 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3301 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3302
3303 SlowPathFn = CGM.getModule().getOrInsertFunction(
3304 "__cfi_slowpath_diag",
3305 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
3306 false));
3307 CheckCall = Builder.CreateCall(
3308 SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
3309 } else {
3310 SlowPathFn = CGM.getModule().getOrInsertFunction(
3311 "__cfi_slowpath",
3312 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
3313 CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
3314 }
3315
3316 CGM.setDSOLocal(
3317 cast<llvm::GlobalValue>(SlowPathFn.getCallee()->stripPointerCasts()));
3318 CheckCall->setDoesNotThrow();
3319
3320 EmitBlock(Cont);
3321}
3322
3323// Emit a stub for __cfi_check function so that the linker knows about this
3324// symbol in LTO mode.
3325void CodeGenFunction::EmitCfiCheckStub() {
3326 llvm::Module *M = &CGM.getModule();
3327 auto &Ctx = M->getContext();
3328 llvm::Function *F = llvm::Function::Create(
3329 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
3330 llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
3331 CGM.setDSOLocal(F);
3332 llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
3333 // FIXME: consider emitting an intrinsic call like
3334 // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
3335 // which can be lowered in CrossDSOCFI pass to the actual contents of
3336 // __cfi_check. This would allow inlining of __cfi_check calls.
3337 llvm::CallInst::Create(
3338 llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
3339 llvm::ReturnInst::Create(Ctx, nullptr, BB);
3340}
3341
3342// This function is basically a switch over the CFI failure kind, which is
3343// extracted from CFICheckFailData (1st function argument). Each case is either
3344// llvm.trap or a call to one of the two runtime handlers, based on
3345// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
3346// failure kind) traps, but this should really never happen. CFICheckFailData
3347// can be nullptr if the calling module has -fsanitize-trap behavior for this
3348// check kind; in this case __cfi_check_fail traps as well.
3349void CodeGenFunction::EmitCfiCheckFail() {
3350 SanitizerScope SanScope(this);
3351 FunctionArgList Args;
3352 ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
3353 ImplicitParamDecl::Other);
3354 ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
3355 ImplicitParamDecl::Other);
3356 Args.push_back(&ArgData);
3357 Args.push_back(&ArgAddr);
3358
3359 const CGFunctionInfo &FI =
3360 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
3361
3362 llvm::Function *F = llvm::Function::Create(
3363 llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
3364 llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
3365
3366 CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F);
3367 CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
3368 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
3369
3370 StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
3371 SourceLocation());
3372
3373 // This function should not be affected by blacklist. This function does
3374 // not have a source location, but "src:*" would still apply. Revert any
3375 // changes to SanOpts made in StartFunction.
3376 SanOpts = CGM.getLangOpts().Sanitize;
3377
3378 llvm::Value *Data =
3379 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
3380 CGM.getContext().VoidPtrTy, ArgData.getLocation());
3381 llvm::Value *Addr =
3382 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
3383 CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
3384
3385 // Data == nullptr means the calling module has trap behaviour for this check.
3386 llvm::Value *DataIsNotNullPtr =
3387 Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
3388 EmitTrapCheck(DataIsNotNullPtr);
3389
3390 llvm::StructType *SourceLocationTy =
3391 llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
3392 llvm::StructType *CfiCheckFailDataTy =
3393 llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
3394
3395 llvm::Value *V = Builder.CreateConstGEP2_32(
3396 CfiCheckFailDataTy,
3397 Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
3398 0);
3399 Address CheckKindAddr(V, getIntAlign());
3400 llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
3401
3402 llvm::Value *AllVtables = llvm::MetadataAsValue::get(
3403 CGM.getLLVMContext(),
3404 llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
3405 llvm::Value *ValidVtable = Builder.CreateZExt(
3406 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
3407 {Addr, AllVtables}),
3408 IntPtrTy);
3409
3410 const std::pair<int, SanitizerMask> CheckKinds[] = {
3411 {CFITCK_VCall, SanitizerKind::CFIVCall},
3412 {CFITCK_NVCall, SanitizerKind::CFINVCall},
3413 {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
3414 {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
3415 {CFITCK_ICall, SanitizerKind::CFIICall}};
3416
3417 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
3418 for (auto CheckKindMaskPair : CheckKinds) {
3419 int Kind = CheckKindMaskPair.first;
3420 SanitizerMask Mask = CheckKindMaskPair.second;
3421 llvm::Value *Cond =
3422 Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
3423 if (CGM.getLangOpts().Sanitize.has(Mask))
3424 EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
3425 {Data, Addr, ValidVtable});
3426 else
3427 EmitTrapCheck(Cond);
3428 }
3429
3430 FinishFunction();
3431 // The only reference to this function will be created during LTO link.
3432 // Make sure it survives until then.
3433 CGM.addUsedGlobal(F);
3434}
3435
3436void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
3437 if (SanOpts.has(SanitizerKind::Unreachable)) {
3438 SanitizerScope SanScope(this);
3439 EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
3440 SanitizerKind::Unreachable),
3441 SanitizerHandler::BuiltinUnreachable,
3442 EmitCheckSourceLocation(Loc), None);
3443 }
3444 Builder.CreateUnreachable();
3445}
3446
3447void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
3448 llvm::BasicBlock *Cont = createBasicBlock("cont");
3449
3450 // If we're optimizing, collapse all calls to trap down to just one per
3451 // function to save on code size.
3452 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
3453 TrapBB = createBasicBlock("trap");
3454 Builder.CreateCondBr(Checked, Cont, TrapBB);
3455 EmitBlock(TrapBB);
3456 llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
3457 TrapCall->setDoesNotReturn();
3458 TrapCall->setDoesNotThrow();
3459 Builder.CreateUnreachable();
3460 } else {
3461 Builder.CreateCondBr(Checked, Cont, TrapBB);
3462 }
3463
3464 EmitBlock(Cont);
3465}
3466
3467llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
3468 llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
3469
3470 if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
3471 auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
3472 CGM.getCodeGenOpts().TrapFuncName);
3473 TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
3474 }
3475
3476 return TrapCall;
3477}
3478
3479Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
3480 LValueBaseInfo *BaseInfo,
3481 TBAAAccessInfo *TBAAInfo) {
3482 assert(E->getType()->isArrayType() &&((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3483, __PRETTY_FUNCTION__))
3483 "Array to pointer decay must have array source type!")((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3483, __PRETTY_FUNCTION__))
;
3484
3485 // Expressions of array type can't be bitfields or vector elements.
3486 LValue LV = EmitLValue(E);
3487 Address Addr = LV.getAddress(*this);
3488
3489 // If the array type was an incomplete type, we need to make sure
3490 // the decay ends up being the right type.
3491 llvm::Type *NewTy = ConvertType(E->getType());
3492 Addr = Builder.CreateElementBitCast(Addr, NewTy);
3493
3494 // Note that VLA pointers are always decayed, so we don't need to do
3495 // anything here.
3496 if (!E->getType()->isVariableArrayType()) {
3497 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3498, __PRETTY_FUNCTION__))
3498 "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3498, __PRETTY_FUNCTION__))
;
3499 Addr = Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3500 }
3501
3502 // The result of this decay conversion points to an array element within the
3503 // base lvalue. However, since TBAA currently does not support representing
3504 // accesses to elements of member arrays, we conservatively represent accesses
3505 // to the pointee object as if it had no any base lvalue specified.
3506 // TODO: Support TBAA for member arrays.
3507 QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
3508 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
3509 if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
3510
3511 return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
3512}
3513
3514/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3515/// array to pointer, return the array subexpression.
3516static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
3517 // If this isn't just an array->pointer decay, bail out.
3518 const auto *CE = dyn_cast<CastExpr>(E);
3519 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
3520 return nullptr;
3521
3522 // If this is a decay from variable width array, bail out.
3523 const Expr *SubExpr = CE->getSubExpr();
3524 if (SubExpr->getType()->isVariableArrayType())
3525 return nullptr;
3526
3527 return SubExpr;
3528}
3529
3530static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
3531 llvm::Value *ptr,
3532 ArrayRef<llvm::Value*> indices,
3533 bool inbounds,
3534 bool signedIndices,
3535 SourceLocation loc,
3536 const llvm::Twine &name = "arrayidx") {
3537 if (inbounds) {
3538 return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
3539 CodeGenFunction::NotSubtraction, loc,
3540 name);
3541 } else {
3542 return CGF.Builder.CreateGEP(ptr, indices, name);
3543 }
3544}
3545
3546static CharUnits getArrayElementAlign(CharUnits arrayAlign,
3547 llvm::Value *idx,
3548 CharUnits eltSize) {
3549 // If we have a constant index, we can use the exact offset of the
3550 // element we're accessing.
3551 if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
3552 CharUnits offset = constantIdx->getZExtValue() * eltSize;
3553 return arrayAlign.alignmentAtOffset(offset);
3554
3555 // Otherwise, use the worst-case alignment for any element.
3556 } else {
3557 return arrayAlign.alignmentOfArrayElement(eltSize);
3558 }
3559}
3560
3561static QualType getFixedSizeElementType(const ASTContext &ctx,
3562 const VariableArrayType *vla) {
3563 QualType eltType;
3564 do {
3565 eltType = vla->getElementType();
3566 } while ((vla = ctx.getAsVariableArrayType(eltType)));
3567 return eltType;
3568}
3569
3570/// Given an array base, check whether its member access belongs to a record
3571/// with preserve_access_index attribute or not.
3572static bool IsPreserveAIArrayBase(CodeGenFunction &CGF, const Expr *ArrayBase) {
3573 if (!ArrayBase || !CGF.getDebugInfo())
3574 return false;
3575
3576 // Only support base as either a MemberExpr or DeclRefExpr.
3577 // DeclRefExpr to cover cases like:
3578 // struct s { int a; int b[10]; };
3579 // struct s *p;
3580 // p[1].a
3581 // p[1] will generate a DeclRefExpr and p[1].a is a MemberExpr.
3582 // p->b[5] is a MemberExpr example.
3583 const Expr *E = ArrayBase->IgnoreImpCasts();
3584 if (const auto *ME = dyn_cast<MemberExpr>(E))
3585 return ME->getMemberDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
3586
3587 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
3588 const auto *VarDef = dyn_cast<VarDecl>(DRE->getDecl());
3589 if (!VarDef)
3590 return false;
3591
3592 const auto *PtrT = VarDef->getType()->getAs<PointerType>();
3593 if (!PtrT)
3594 return false;
3595
3596 const auto *PointeeT = PtrT->getPointeeType()
3597 ->getUnqualifiedDesugaredType();
3598 if (const auto *RecT = dyn_cast<RecordType>(PointeeT))
3599 return RecT->getDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
3600 return false;
3601 }
3602
3603 return false;
3604}
3605
3606static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
3607 ArrayRef<llvm::Value *> indices,
3608 QualType eltType, bool inbounds,
3609 bool signedIndices, SourceLocation loc,
3610 QualType *arrayType = nullptr,
3611 const Expr *Base = nullptr,
3612 const llvm::Twine &name = "arrayidx") {
3613 // All the indices except that last must be zero.
3614#ifndef NDEBUG
3615 for (auto idx : indices.drop_back())
3616 assert(isa<llvm::ConstantInt>(idx) &&((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3617, __PRETTY_FUNCTION__))
3617 cast<llvm::ConstantInt>(idx)->isZero())((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3617, __PRETTY_FUNCTION__))
;
3618#endif
3619
3620 // Determine the element size of the statically-sized base. This is
3621 // the thing that the indices are expressed in terms of.
3622 if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
3623 eltType = getFixedSizeElementType(CGF.getContext(), vla);
3624 }
3625
3626 // We can use that to compute the best alignment of the element.
3627 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
3628 CharUnits eltAlign =
3629 getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
3630
3631 llvm::Value *eltPtr;
3632 auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
3633 if (!LastIndex ||
3634 (!CGF.IsInPreservedAIRegion && !IsPreserveAIArrayBase(CGF, Base))) {
3635 eltPtr = emitArraySubscriptGEP(
3636 CGF, addr.getPointer(), indices, inbounds, signedIndices,
3637 loc, name);
3638 } else {
3639 // Remember the original array subscript for bpf target
3640 unsigned idx = LastIndex->getZExtValue();
3641 llvm::DIType *DbgInfo = nullptr;
3642 if (arrayType)
3643 DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(*arrayType, loc);
3644 eltPtr = CGF.Builder.CreatePreserveArrayAccessIndex(addr.getElementType(),
3645 addr.getPointer(),
3646 indices.size() - 1,
3647 idx, DbgInfo);
3648 }
3649
3650 return Address(eltPtr, eltAlign);
3651}
3652
3653LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3654 bool Accessed) {
3655 // The index must always be an integer, which is not an aggregate. Emit it
3656 // in lexical order (this complexity is, sadly, required by C++17).
3657 llvm::Value *IdxPre =
3658 (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
3659 bool SignedIndices = false;
3660 auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
3661 auto *Idx = IdxPre;
3662 if (E->getLHS() != E->getIdx()) {
3663 assert(E->getRHS() == E->getIdx() && "index was neither LHS nor RHS")((E->getRHS() == E->getIdx() && "index was neither LHS nor RHS"
) ? static_cast<void> (0) : __assert_fail ("E->getRHS() == E->getIdx() && \"index was neither LHS nor RHS\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3663, __PRETTY_FUNCTION__))
;
3664 Idx = EmitScalarExpr(E->getIdx());
3665 }
3666
3667 QualType IdxTy = E->getIdx()->getType();
3668 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
3669 SignedIndices |= IdxSigned;
3670
3671 if (SanOpts.has(SanitizerKind::ArrayBounds))
3672 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
3673
3674 // Extend or truncate the index type to 32 or 64-bits.
3675 if (Promote && Idx->getType() != IntPtrTy)
3676 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
3677
3678 return Idx;
3679 };
3680 IdxPre = nullptr;
3681
3682 // If the base is a vector type, then we are forming a vector element lvalue
3683 // with this subscript.
3684 if (E->getBase()->getType()->isVectorType() &&
3685 !isa<ExtVectorElementExpr>(E->getBase())) {
3686 // Emit the vector as an lvalue to get its address.
3687 LValue LHS = EmitLValue(E->getBase());
3688 auto *Idx = EmitIdxAfterBase(/*Promote*/false);
3689 assert(LHS.isSimple() && "Can only subscript lvalue vectors here!")((LHS.isSimple() && "Can only subscript lvalue vectors here!"
) ? static_cast<void> (0) : __assert_fail ("LHS.isSimple() && \"Can only subscript lvalue vectors here!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3689, __PRETTY_FUNCTION__))
;
3690 return LValue::MakeVectorElt(LHS.getAddress(*this), Idx,
3691 E->getBase()->getType(), LHS.getBaseInfo(),
3692 TBAAAccessInfo());
3693 }
3694
3695 // All the other cases basically behave like simple offsetting.
3696
3697 // Handle the extvector case we ignored above.
3698 if (isa<ExtVectorElementExpr>(E->getBase())) {
3699 LValue LV = EmitLValue(E->getBase());
3700 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3701 Address Addr = EmitExtVectorElementLValue(LV);
3702
3703 QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
3704 Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
3705 SignedIndices, E->getExprLoc());
3706 return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
3707 CGM.getTBAAInfoForSubobject(LV, EltType));
3708 }
3709
3710 LValueBaseInfo EltBaseInfo;
3711 TBAAAccessInfo EltTBAAInfo;
3712 Address Addr = Address::invalid();
3713 if (const VariableArrayType *vla =
3714 getContext().getAsVariableArrayType(E->getType())) {
3715 // The base must be a pointer, which is not an aggregate. Emit
3716 // it. It needs to be emitted first in case it's what captures
3717 // the VLA bounds.
3718 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3719 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3720
3721 // The element count here is the total number of non-VLA elements.
3722 llvm::Value *numElements = getVLASize(vla).NumElts;
3723
3724 // Effectively, the multiply by the VLA size is part of the GEP.
3725 // GEP indexes are signed, and scaling an index isn't permitted to
3726 // signed-overflow, so we use the same semantics for our explicit
3727 // multiply. We suppress this if overflow is not undefined behavior.
3728 if (getLangOpts().isSignedOverflowDefined()) {
3729 Idx = Builder.CreateMul(Idx, numElements);
3730 } else {
3731 Idx = Builder.CreateNSWMul(Idx, numElements);
3732 }
3733
3734 Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
3735 !getLangOpts().isSignedOverflowDefined(),
3736 SignedIndices, E->getExprLoc());
3737
3738 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
3739 // Indexing over an interface, as in "NSString *P; P[4];"
3740
3741 // Emit the base pointer.
3742 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3743 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3744
3745 CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
3746 llvm::Value *InterfaceSizeVal =
3747 llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
3748
3749 llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
3750
3751 // We don't necessarily build correct LLVM struct types for ObjC
3752 // interfaces, so we can't rely on GEP to do this scaling
3753 // correctly, so we need to cast to i8*. FIXME: is this actually
3754 // true? A lot of other things in the fragile ABI would break...
3755 llvm::Type *OrigBaseTy = Addr.getType();
3756 Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
3757
3758 // Do the GEP.
3759 CharUnits EltAlign =
3760 getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
3761 llvm::Value *EltPtr =
3762 emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
3763 SignedIndices, E->getExprLoc());
3764 Addr = Address(EltPtr, EltAlign);
3765
3766 // Cast back.
3767 Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
3768 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3769 // If this is A[i] where A is an array, the frontend will have decayed the
3770 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3771 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3772 // "gep x, i" here. Emit one "gep A, 0, i".
3773 assert(Array->getType()->isArrayType() &&((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3774, __PRETTY_FUNCTION__))
3774 "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3774, __PRETTY_FUNCTION__))
;
3775 LValue ArrayLV;
3776 // For simple multidimensional array indexing, set the 'accessed' flag for
3777 // better bounds-checking of the base expression.
3778 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3779 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3780 else
3781 ArrayLV = EmitLValue(Array);
3782 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3783
3784 // Propagate the alignment from the array itself to the result.
3785 QualType arrayType = Array->getType();
3786 Addr = emitArraySubscriptGEP(
3787 *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
3788 E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
3789 E->getExprLoc(), &arrayType, E->getBase());
3790 EltBaseInfo = ArrayLV.getBaseInfo();
3791 EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
3792 } else {
3793 // The base must be a pointer; emit it with an estimate of its alignment.
3794 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3795 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3796 QualType ptrType = E->getBase()->getType();
3797 Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
3798 !getLangOpts().isSignedOverflowDefined(),
3799 SignedIndices, E->getExprLoc(), &ptrType,
3800 E->getBase());
3801 }
3802
3803 LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
3804
3805 if (getLangOpts().ObjC &&
3806 getLangOpts().getGC() != LangOptions::NonGC) {
3807 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
3808 setObjCGCLValueClass(getContext(), E, LV);
3809 }
3810 return LV;
3811}
3812
3813LValue CodeGenFunction::EmitMatrixSubscriptExpr(const MatrixSubscriptExpr *E) {
3814 assert(((!E->isIncomplete() && "incomplete matrix subscript expressions should be rejected during Sema"
) ? static_cast<void> (0) : __assert_fail ("!E->isIncomplete() && \"incomplete matrix subscript expressions should be rejected during Sema\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3816, __PRETTY_FUNCTION__))
17
Assuming the condition is true
18
'?' condition is true
3815 !E->isIncomplete() &&((!E->isIncomplete() && "incomplete matrix subscript expressions should be rejected during Sema"
) ? static_cast<void> (0) : __assert_fail ("!E->isIncomplete() && \"incomplete matrix subscript expressions should be rejected during Sema\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3816, __PRETTY_FUNCTION__))
3816 "incomplete matrix subscript expressions should be rejected during Sema")((!E->isIncomplete() && "incomplete matrix subscript expressions should be rejected during Sema"
) ? static_cast<void> (0) : __assert_fail ("!E->isIncomplete() && \"incomplete matrix subscript expressions should be rejected during Sema\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3816, __PRETTY_FUNCTION__))
;
3817 LValue Base = EmitLValue(E->getBase());
3818 llvm::Value *RowIdx = EmitScalarExpr(E->getRowIdx());
3819 llvm::Value *ColIdx = EmitScalarExpr(E->getColumnIdx());
3820 llvm::Value *NumRows = Builder.getIntN(
3821 RowIdx->getType()->getScalarSizeInBits(),
3822 E->getBase()->getType()->getAs<ConstantMatrixType>()->getNumRows());
19
Assuming the object is not a 'ConstantMatrixType'
20
Called C++ object pointer is null
3823 llvm::Value *FinalIdx =
3824 Builder.CreateAdd(Builder.CreateMul(ColIdx, NumRows), RowIdx);
3825 return LValue::MakeMatrixElt(
3826 MaybeConvertMatrixAddress(Base.getAddress(*this), *this), FinalIdx,
3827 E->getBase()->getType(), Base.getBaseInfo(), TBAAAccessInfo());
3828}
3829
3830static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
3831 LValueBaseInfo &BaseInfo,
3832 TBAAAccessInfo &TBAAInfo,
3833 QualType BaseTy, QualType ElTy,
3834 bool IsLowerBound) {
3835 LValue BaseLVal;
3836 if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
3837 BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
3838 if (BaseTy->isArrayType()) {
3839 Address Addr = BaseLVal.getAddress(CGF);
3840 BaseInfo = BaseLVal.getBaseInfo();
3841
3842 // If the array type was an incomplete type, we need to make sure
3843 // the decay ends up being the right type.
3844 llvm::Type *NewTy = CGF.ConvertType(BaseTy);
3845 Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
3846
3847 // Note that VLA pointers are always decayed, so we don't need to do
3848 // anything here.
3849 if (!BaseTy->isVariableArrayType()) {
3850 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3851, __PRETTY_FUNCTION__))
3851 "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3851, __PRETTY_FUNCTION__))
;
3852 Addr = CGF.Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3853 }
3854
3855 return CGF.Builder.CreateElementBitCast(Addr,
3856 CGF.ConvertTypeForMem(ElTy));
3857 }
3858 LValueBaseInfo TypeBaseInfo;
3859 TBAAAccessInfo TypeTBAAInfo;
3860 CharUnits Align =
3861 CGF.CGM.getNaturalTypeAlignment(ElTy, &TypeBaseInfo, &TypeTBAAInfo);
3862 BaseInfo.mergeForCast(TypeBaseInfo);
3863 TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
3864 return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress(CGF)), Align);
3865 }
3866 return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3867}
3868
3869LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3870 bool IsLowerBound) {
3871 QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
3872 QualType ResultExprTy;
3873 if (auto *AT = getContext().getAsArrayType(BaseTy))
3874 ResultExprTy = AT->getElementType();
3875 else
3876 ResultExprTy = BaseTy->getPointeeType();
3877 llvm::Value *Idx = nullptr;
3878 if (IsLowerBound || E->getColonLocFirst().isInvalid()) {
3879 // Requesting lower bound or upper bound, but without provided length and
3880 // without ':' symbol for the default length -> length = 1.
3881 // Idx = LowerBound ?: 0;
3882 if (auto *LowerBound = E->getLowerBound()) {
3883 Idx = Builder.CreateIntCast(
3884 EmitScalarExpr(LowerBound), IntPtrTy,
3885 LowerBound->getType()->hasSignedIntegerRepresentation());
3886 } else
3887 Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
3888 } else {
3889 // Try to emit length or lower bound as constant. If this is possible, 1
3890 // is subtracted from constant length or lower bound. Otherwise, emit LLVM
3891 // IR (LB + Len) - 1.
3892 auto &C = CGM.getContext();
3893 auto *Length = E->getLength();
3894 llvm::APSInt ConstLength;
3895 if (Length) {
3896 // Idx = LowerBound + Length - 1;
3897 if (Optional<llvm::APSInt> CL = Length->getIntegerConstantExpr(C)) {
3898 ConstLength = CL->zextOrTrunc(PointerWidthInBits);
3899 Length = nullptr;
3900 }
3901 auto *LowerBound = E->getLowerBound();
3902 llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
3903 if (LowerBound) {
3904 if (Optional<llvm::APSInt> LB = LowerBound->getIntegerConstantExpr(C)) {
3905 ConstLowerBound = LB->zextOrTrunc(PointerWidthInBits);
3906 LowerBound = nullptr;
3907 }
3908 }
3909 if (!Length)
3910 --ConstLength;
3911 else if (!LowerBound)
3912 --ConstLowerBound;
3913
3914 if (Length || LowerBound) {
3915 auto *LowerBoundVal =
3916 LowerBound
3917 ? Builder.CreateIntCast(
3918 EmitScalarExpr(LowerBound), IntPtrTy,
3919 LowerBound->getType()->hasSignedIntegerRepresentation())
3920 : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
3921 auto *LengthVal =
3922 Length
3923 ? Builder.CreateIntCast(
3924 EmitScalarExpr(Length), IntPtrTy,
3925 Length->getType()->hasSignedIntegerRepresentation())
3926 : llvm::ConstantInt::get(IntPtrTy, ConstLength);
3927 Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
3928 /*HasNUW=*/false,
3929 !getLangOpts().isSignedOverflowDefined());
3930 if (Length && LowerBound) {
3931 Idx = Builder.CreateSub(
3932 Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
3933 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3934 }
3935 } else
3936 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
3937 } else {
3938 // Idx = ArraySize - 1;
3939 QualType ArrayTy = BaseTy->isPointerType()
3940 ? E->getBase()->IgnoreParenImpCasts()->getType()
3941 : BaseTy;
3942 if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
3943 Length = VAT->getSizeExpr();
3944 if (Optional<llvm::APSInt> L = Length->getIntegerConstantExpr(C)) {
3945 ConstLength = *L;
3946 Length = nullptr;
3947 }
3948 } else {
3949 auto *CAT = C.getAsConstantArrayType(ArrayTy);
3950 ConstLength = CAT->getSize();
3951 }
3952 if (Length) {
3953 auto *LengthVal = Builder.CreateIntCast(
3954 EmitScalarExpr(Length), IntPtrTy,
3955 Length->getType()->hasSignedIntegerRepresentation());
3956 Idx = Builder.CreateSub(
3957 LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
3958 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3959 } else {
3960 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3961 --ConstLength;
3962 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
3963 }
3964 }
3965 }
3966 assert(Idx)((Idx) ? static_cast<void> (0) : __assert_fail ("Idx", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3966, __PRETTY_FUNCTION__))
;
3967
3968 Address EltPtr = Address::invalid();
3969 LValueBaseInfo BaseInfo;
3970 TBAAAccessInfo TBAAInfo;
3971 if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
3972 // The base must be a pointer, which is not an aggregate. Emit
3973 // it. It needs to be emitted first in case it's what captures
3974 // the VLA bounds.
3975 Address Base =
3976 emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
3977 BaseTy, VLA->getElementType(), IsLowerBound);
3978 // The element count here is the total number of non-VLA elements.
3979 llvm::Value *NumElements = getVLASize(VLA).NumElts;
3980
3981 // Effectively, the multiply by the VLA size is part of the GEP.
3982 // GEP indexes are signed, and scaling an index isn't permitted to
3983 // signed-overflow, so we use the same semantics for our explicit
3984 // multiply. We suppress this if overflow is not undefined behavior.
3985 if (getLangOpts().isSignedOverflowDefined())
3986 Idx = Builder.CreateMul(Idx, NumElements);
3987 else
3988 Idx = Builder.CreateNSWMul(Idx, NumElements);
3989 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
3990 !getLangOpts().isSignedOverflowDefined(),
3991 /*signedIndices=*/false, E->getExprLoc());
3992 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3993 // If this is A[i] where A is an array, the frontend will have decayed the
3994 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3995 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3996 // "gep x, i" here. Emit one "gep A, 0, i".
3997 assert(Array->getType()->isArrayType() &&((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3998, __PRETTY_FUNCTION__))
3998 "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 3998, __PRETTY_FUNCTION__))
;
3999 LValue ArrayLV;
4000 // For simple multidimensional array indexing, set the 'accessed' flag for
4001 // better bounds-checking of the base expression.
4002 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
4003 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
4004 else
4005 ArrayLV = EmitLValue(Array);
4006
4007 // Propagate the alignment from the array itself to the result.
4008 EltPtr = emitArraySubscriptGEP(
4009 *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
4010 ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
4011 /*signedIndices=*/false, E->getExprLoc());
4012 BaseInfo = ArrayLV.getBaseInfo();
4013 TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
4014 } else {
4015 Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
4016 TBAAInfo, BaseTy, ResultExprTy,
4017 IsLowerBound);
4018 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
4019 !getLangOpts().isSignedOverflowDefined(),
4020 /*signedIndices=*/false, E->getExprLoc());
4021 }
4022
4023 return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
4024}
4025
4026LValue CodeGenFunction::
4027EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
4028 // Emit the base vector as an l-value.
4029 LValue Base;
4030
4031 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
4032 if (E->isArrow()) {
4033 // If it is a pointer to a vector, emit the address and form an lvalue with
4034 // it.
4035 LValueBaseInfo BaseInfo;
4036 TBAAAccessInfo TBAAInfo;
4037 Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
4038 const auto *PT = E->getBase()->getType()->castAs<PointerType>();
4039 Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
4040 Base.getQuals().removeObjCGCAttr();
4041 } else if (E->getBase()->isGLValue()) {
4042 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
4043 // emit the base as an lvalue.
4044 assert(E->getBase()->getType()->isVectorType())((E->getBase()->getType()->isVectorType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4044, __PRETTY_FUNCTION__))
;
4045 Base = EmitLValue(E->getBase());
4046 } else {
4047 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
4048 assert(E->getBase()->getType()->isVectorType() &&((E->getBase()->getType()->isVectorType() &&
"Result must be a vector") ? static_cast<void> (0) : __assert_fail
("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4049, __PRETTY_FUNCTION__))
4049 "Result must be a vector")((E->getBase()->getType()->isVectorType() &&
"Result must be a vector") ? static_cast<void> (0) : __assert_fail
("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4049, __PRETTY_FUNCTION__))
;
4050 llvm::Value *Vec = EmitScalarExpr(E->getBase());
4051
4052 // Store the vector to memory (because LValue wants an address).
4053 Address VecMem = CreateMemTemp(E->getBase()->getType());
4054 Builder.CreateStore(Vec, VecMem);
4055 Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
4056 AlignmentSource::Decl);
4057 }
4058
4059 QualType type =
4060 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
4061
4062 // Encode the element access list into a vector of unsigned indices.
4063 SmallVector<uint32_t, 4> Indices;
4064 E->getEncodedElementAccess(Indices);
4065
4066 if (Base.isSimple()) {
4067 llvm::Constant *CV =
4068 llvm::ConstantDataVector::get(getLLVMContext(), Indices);
4069 return LValue::MakeExtVectorElt(Base.getAddress(*this), CV, type,
4070 Base.getBaseInfo(), TBAAAccessInfo());
4071 }
4072 assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!")((Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!"
) ? static_cast<void> (0) : __assert_fail ("Base.isExtVectorElt() && \"Can only subscript lvalue vec elts here!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4072, __PRETTY_FUNCTION__))
;
4073
4074 llvm::Constant *BaseElts = Base.getExtVectorElts();
4075 SmallVector<llvm::Constant *, 4> CElts;
4076
4077 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
4078 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
4079 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
4080 return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
4081 Base.getBaseInfo(), TBAAAccessInfo());
4082}
4083
4084LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
4085 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
4086 EmitIgnoredExpr(E->getBase());
4087 return EmitDeclRefLValue(DRE);
4088 }
4089
4090 Expr *BaseExpr = E->getBase();
4091 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
4092 LValue BaseLV;
4093 if (E->isArrow()) {
4094 LValueBaseInfo BaseInfo;
4095 TBAAAccessInfo TBAAInfo;
4096 Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
4097 QualType PtrTy = BaseExpr->getType()->getPointeeType();
4098 SanitizerSet SkippedChecks;
4099 bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
4100 if (IsBaseCXXThis)
4101 SkippedChecks.set(SanitizerKind::Alignment, true);
4102 if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
4103 SkippedChecks.set(SanitizerKind::Null, true);
4104 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
4105 /*Alignment=*/CharUnits::Zero(), SkippedChecks);
4106 BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
4107 } else
4108 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
4109
4110 NamedDecl *ND = E->getMemberDecl();
4111 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
4112 LValue LV = EmitLValueForField(BaseLV, Field);
4113 setObjCGCLValueClass(getContext(), E, LV);
4114 if (getLangOpts().OpenMP) {
4115 // If the member was explicitly marked as nontemporal, mark it as
4116 // nontemporal. If the base lvalue is marked as nontemporal, mark access
4117 // to children as nontemporal too.
4118 if ((IsWrappedCXXThis(BaseExpr) &&
4119 CGM.getOpenMPRuntime().isNontemporalDecl(Field)) ||
4120 BaseLV.isNontemporal())
4121 LV.setNontemporal(/*Value=*/true);
4122 }
4123 return LV;
4124 }
4125
4126 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
4127 return EmitFunctionDeclLValue(*this, E, FD);
4128
4129 llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4129)
;
4130}
4131
4132/// Given that we are currently emitting a lambda, emit an l-value for
4133/// one of its members.
4134LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
4135 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda())((cast<CXXMethodDecl>(CurCodeDecl)->getParent()->
isLambda()) ? static_cast<void> (0) : __assert_fail ("cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4135, __PRETTY_FUNCTION__))
;
4136 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent())((cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field
->getParent()) ? static_cast<void> (0) : __assert_fail
("cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4136, __PRETTY_FUNCTION__))
;
4137 QualType LambdaTagType =
4138 getContext().getTagDeclType(Field->getParent());
4139 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
4140 return EmitLValueForField(LambdaLV, Field);
4141}
4142
4143/// Get the field index in the debug info. The debug info structure/union
4144/// will ignore the unnamed bitfields.
4145unsigned CodeGenFunction::getDebugInfoFIndex(const RecordDecl *Rec,
4146 unsigned FieldIndex) {
4147 unsigned I = 0, Skipped = 0;
4148
4149 for (auto F : Rec->getDefinition()->fields()) {
4150 if (I == FieldIndex)
4151 break;
4152 if (F->isUnnamedBitfield())
4153 Skipped++;
4154 I++;
4155 }
4156
4157 return FieldIndex - Skipped;
4158}
4159
4160/// Get the address of a zero-sized field within a record. The resulting
4161/// address doesn't necessarily have the right type.
4162static Address emitAddrOfZeroSizeField(CodeGenFunction &CGF, Address Base,
4163 const FieldDecl *Field) {
4164 CharUnits Offset = CGF.getContext().toCharUnitsFromBits(
4165 CGF.getContext().getFieldOffset(Field));
4166 if (Offset.isZero())
4167 return Base;
4168 Base = CGF.Builder.CreateElementBitCast(Base, CGF.Int8Ty);
4169 return CGF.Builder.CreateConstInBoundsByteGEP(Base, Offset);
4170}
4171
4172/// Drill down to the storage of a field without walking into
4173/// reference types.
4174///
4175/// The resulting address doesn't necessarily have the right type.
4176static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
4177 const FieldDecl *field) {
4178 if (field->isZeroSize(CGF.getContext()))
4179 return emitAddrOfZeroSizeField(CGF, base, field);
4180
4181 const RecordDecl *rec = field->getParent();
4182
4183 unsigned idx =
4184 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
4185
4186 return CGF.Builder.CreateStructGEP(base, idx, field->getName());
4187}
4188
4189static Address emitPreserveStructAccess(CodeGenFunction &CGF, LValue base,
4190 Address addr, const FieldDecl *field) {
4191 const RecordDecl *rec = field->getParent();
4192 llvm::DIType *DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(
4193 base.getType(), rec->getLocation());
4194
4195 unsigned idx =
4196 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
4197
4198 return CGF.Builder.CreatePreserveStructAccessIndex(
4199 addr, idx, CGF.getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo);
4200}
4201
4202static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
4203 const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
4204 if (!RD)
4205 return false;
4206
4207 if (RD->isDynamicClass())
4208 return true;
4209
4210 for (const auto &Base : RD->bases())
4211 if (hasAnyVptr(Base.getType(), Context))
4212 return true;
4213
4214 for (const FieldDecl *Field : RD->fields())
4215 if (hasAnyVptr(Field->getType(), Context))
4216 return true;
4217
4218 return false;
4219}
4220
4221LValue CodeGenFunction::EmitLValueForField(LValue base,
4222 const FieldDecl *field) {
4223 LValueBaseInfo BaseInfo = base.getBaseInfo();
4224
4225 if (field->isBitField()) {
4226 const CGRecordLayout &RL =
4227 CGM.getTypes().getCGRecordLayout(field->getParent());
4228 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
4229 const bool UseVolatile = isAAPCS(CGM.getTarget()) &&
4230 CGM.getCodeGenOpts().AAPCSBitfieldWidth &&
4231 Info.VolatileStorageSize != 0 &&
4232 field->getType()
4233 .withCVRQualifiers(base.getVRQualifiers())
4234 .isVolatileQualified();
4235 Address Addr = base.getAddress(*this);
4236 unsigned Idx = RL.getLLVMFieldNo(field);
4237 const RecordDecl *rec = field->getParent();
4238 if (!UseVolatile) {
4239 if (!IsInPreservedAIRegion &&
4240 (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
4241 if (Idx != 0)
4242 // For structs, we GEP to the field that the record layout suggests.
4243 Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
4244 } else {
4245 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4246 getContext().getRecordType(rec), rec->getLocation());
4247 Addr = Builder.CreatePreserveStructAccessIndex(
4248 Addr, Idx, getDebugInfoFIndex(rec, field->getFieldIndex()),
4249 DbgInfo);
4250 }
4251 }
4252 const unsigned SS =
4253 UseVolatile ? Info.VolatileStorageSize : Info.StorageSize;
4254 // Get the access type.
4255 llvm::Type *FieldIntTy = llvm::Type::getIntNTy(getLLVMContext(), SS);
4256 if (Addr.getElementType() != FieldIntTy)
4257 Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
4258 if (UseVolatile) {
4259 const unsigned VolatileOffset = Info.VolatileStorageOffset.getQuantity();
4260 if (VolatileOffset)
4261 Addr = Builder.CreateConstInBoundsGEP(Addr, VolatileOffset);
4262 }
4263
4264 QualType fieldType =
4265 field->getType().withCVRQualifiers(base.getVRQualifiers());
4266 // TODO: Support TBAA for bit fields.
4267 LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
4268 return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
4269 TBAAAccessInfo());
4270 }
4271
4272 // Fields of may-alias structures are may-alias themselves.
4273 // FIXME: this should get propagated down through anonymous structs
4274 // and unions.
4275 QualType FieldType = field->getType();
4276 const RecordDecl *rec = field->getParent();
4277 AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
4278 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
4279 TBAAAccessInfo FieldTBAAInfo;
4280 if (base.getTBAAInfo().isMayAlias() ||
4281 rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
4282 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4283 } else if (rec->isUnion()) {
4284 // TODO: Support TBAA for unions.
4285 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4286 } else {
4287 // If no base type been assigned for the base access, then try to generate
4288 // one for this base lvalue.
4289 FieldTBAAInfo = base.getTBAAInfo();
4290 if (!FieldTBAAInfo.BaseType) {
4291 FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
4292 assert(!FieldTBAAInfo.Offset &&((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4293, __PRETTY_FUNCTION__))
4293 "Nonzero offset for an access with no base type!")((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4293, __PRETTY_FUNCTION__))
;
4294 }
4295
4296 // Adjust offset to be relative to the base type.
4297 const ASTRecordLayout &Layout =
4298 getContext().getASTRecordLayout(field->getParent());
4299 unsigned CharWidth = getContext().getCharWidth();
4300 if (FieldTBAAInfo.BaseType)
4301 FieldTBAAInfo.Offset +=
4302 Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
4303
4304 // Update the final access type and size.
4305 FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
4306 FieldTBAAInfo.Size =
4307 getContext().getTypeSizeInChars(FieldType).getQuantity();
4308 }
4309
4310 Address addr = base.getAddress(*this);
4311 if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
4312 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4313 ClassDef->isDynamicClass()) {
4314 // Getting to any field of dynamic object requires stripping dynamic
4315 // information provided by invariant.group. This is because accessing
4316 // fields may leak the real address of dynamic object, which could result
4317 // in miscompilation when leaked pointer would be compared.
4318 auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
4319 addr = Address(stripped, addr.getAlignment());
4320 }
4321 }
4322
4323 unsigned RecordCVR = base.getVRQualifiers();
4324 if (rec->isUnion()) {
4325 // For unions, there is no pointer adjustment.
4326 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4327 hasAnyVptr(FieldType, getContext()))
4328 // Because unions can easily skip invariant.barriers, we need to add
4329 // a barrier every time CXXRecord field with vptr is referenced.
4330 addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
4331 addr.getAlignment());
4332
4333 if (IsInPreservedAIRegion ||
4334 (getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
4335 // Remember the original union field index
4336 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateStandaloneType(base.getType(),
4337 rec->getLocation());
4338 addr = Address(
4339 Builder.CreatePreserveUnionAccessIndex(
4340 addr.getPointer(), getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo),
4341 addr.getAlignment());
4342 }
4343
4344 if (FieldType->isReferenceType())
4345 addr = Builder.CreateElementBitCast(
4346 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4347 } else {
4348 if (!IsInPreservedAIRegion &&
4349 (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>()))
4350 // For structs, we GEP to the field that the record layout suggests.
4351 addr = emitAddrOfFieldStorage(*this, addr, field);
4352 else
4353 // Remember the original struct field index
4354 addr = emitPreserveStructAccess(*this, base, addr, field);
4355 }
4356
4357 // If this is a reference field, load the reference right now.
4358 if (FieldType->isReferenceType()) {
4359 LValue RefLVal =
4360 MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4361 if (RecordCVR & Qualifiers::Volatile)
4362 RefLVal.getQuals().addVolatile();
4363 addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
4364
4365 // Qualifiers on the struct don't apply to the referencee.
4366 RecordCVR = 0;
4367 FieldType = FieldType->getPointeeType();
4368 }
4369
4370 // Make sure that the address is pointing to the right type. This is critical
4371 // for both unions and structs. A union needs a bitcast, a struct element
4372 // will need a bitcast if the LLVM type laid out doesn't match the desired
4373 // type.
4374 addr = Builder.CreateElementBitCast(
4375 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4376
4377 if (field->hasAttr<AnnotateAttr>())
4378 addr = EmitFieldAnnotations(field, addr);
4379
4380 LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4381 LV.getQuals().addCVRQualifiers(RecordCVR);
4382
4383 // __weak attribute on a field is ignored.
4384 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
4385 LV.getQuals().removeObjCGCAttr();
4386
4387 return LV;
4388}
4389
4390LValue
4391CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
4392 const FieldDecl *Field) {
4393 QualType FieldType = Field->getType();
4394
4395 if (!FieldType->isReferenceType())
4396 return EmitLValueForField(Base, Field);
4397
4398 Address V = emitAddrOfFieldStorage(*this, Base.getAddress(*this), Field);
4399
4400 // Make sure that the address is pointing to the right type.
4401 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
4402 V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
4403
4404 // TODO: Generate TBAA information that describes this access as a structure
4405 // member access and not just an access to an object of the field's type. This
4406 // should be similar to what we do in EmitLValueForField().
4407 LValueBaseInfo BaseInfo = Base.getBaseInfo();
4408 AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
4409 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
4410 return MakeAddrLValue(V, FieldType, FieldBaseInfo,
4411 CGM.getTBAAInfoForSubobject(Base, FieldType));
4412}
4413
4414LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
4415 if (E->isFileScope()) {
4416 ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
4417 return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
4418 }
4419 if (E->getType()->isVariablyModifiedType())
4420 // make sure to emit the VLA size.
4421 EmitVariablyModifiedType(E->getType());
4422
4423 Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
4424 const Expr *InitExpr = E->getInitializer();
4425 LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
4426
4427 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
4428 /*Init*/ true);
4429
4430 // Block-scope compound literals are destroyed at the end of the enclosing
4431 // scope in C.
4432 if (!getLangOpts().CPlusPlus)
4433 if (QualType::DestructionKind DtorKind = E->getType().isDestructedType())
4434 pushLifetimeExtendedDestroy(getCleanupKind(DtorKind), DeclPtr,
4435 E->getType(), getDestroyer(DtorKind),
4436 DtorKind & EHCleanup);
4437
4438 return Result;
4439}
4440
4441LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
4442 if (!E->isGLValue())
4443 // Initializing an aggregate temporary in C++11: T{...}.
4444 return EmitAggExprToLValue(E);
4445
4446 // An lvalue initializer list must be initializing a reference.
4447 assert(E->isTransparent() && "non-transparent glvalue init list")((E->isTransparent() && "non-transparent glvalue init list"
) ? static_cast<void> (0) : __assert_fail ("E->isTransparent() && \"non-transparent glvalue init list\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4447, __PRETTY_FUNCTION__))
;
4448 return EmitLValue(E->getInit(0));
4449}
4450
4451/// Emit the operand of a glvalue conditional operator. This is either a glvalue
4452/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
4453/// LValue is returned and the current block has been terminated.
4454static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
4455 const Expr *Operand) {
4456 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
4457 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
4458 return None;
4459 }
4460
4461 return CGF.EmitLValue(Operand);
4462}
4463
4464LValue CodeGenFunction::
4465EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
4466 if (!expr->isGLValue()) {
4467 // ?: here should be an aggregate.
4468 assert(hasAggregateEvaluationKind(expr->getType()) &&((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4469, __PRETTY_FUNCTION__))
4469 "Unexpected conditional operator!")((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4469, __PRETTY_FUNCTION__))
;
4470 return EmitAggExprToLValue(expr);
4471 }
4472
4473 OpaqueValueMapping binding(*this, expr);
4474
4475 const Expr *condExpr = expr->getCond();
4476 bool CondExprBool;
4477 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
4478 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
4479 if (!CondExprBool) std::swap(live, dead);
4480
4481 if (!ContainsLabel(dead)) {
4482 // If the true case is live, we need to track its region.
4483 if (CondExprBool)
4484 incrementProfileCounter(expr);
4485 // If a throw expression we emit it and return an undefined lvalue
4486 // because it can't be used.
4487 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(live->IgnoreParens())) {
4488 EmitCXXThrowExpr(ThrowExpr);
4489 llvm::Type *Ty =
4490 llvm::PointerType::getUnqual(ConvertType(dead->getType()));
4491 return MakeAddrLValue(
4492 Address(llvm::UndefValue::get(Ty), CharUnits::One()),
4493 dead->getType());
4494 }
4495 return EmitLValue(live);
4496 }
4497 }
4498
4499 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
4500 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
4501 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
4502
4503 ConditionalEvaluation eval(*this);
4504 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
4505
4506 // Any temporaries created here are conditional.
4507 EmitBlock(lhsBlock);
4508 incrementProfileCounter(expr);
4509 eval.begin(*this);
4510 Optional<LValue> lhs =
4511 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
4512 eval.end(*this);
4513
4514 if (lhs && !lhs->isSimple())
4515 return EmitUnsupportedLValue(expr, "conditional operator");
4516
4517 lhsBlock = Builder.GetInsertBlock();
4518 if (lhs)
4519 Builder.CreateBr(contBlock);
4520
4521 // Any temporaries created here are conditional.
4522 EmitBlock(rhsBlock);
4523 eval.begin(*this);
4524 Optional<LValue> rhs =
4525 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
4526 eval.end(*this);
4527 if (rhs && !rhs->isSimple())
4528 return EmitUnsupportedLValue(expr, "conditional operator");
4529 rhsBlock = Builder.GetInsertBlock();
4530
4531 EmitBlock(contBlock);
4532
4533 if (lhs && rhs) {
4534 llvm::PHINode *phi =
4535 Builder.CreatePHI(lhs->getPointer(*this)->getType(), 2, "cond-lvalue");
4536 phi->addIncoming(lhs->getPointer(*this), lhsBlock);
4537 phi->addIncoming(rhs->getPointer(*this), rhsBlock);
4538 Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
4539 AlignmentSource alignSource =
4540 std::max(lhs->getBaseInfo().getAlignmentSource(),
4541 rhs->getBaseInfo().getAlignmentSource());
4542 TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
4543 lhs->getTBAAInfo(), rhs->getTBAAInfo());
4544 return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
4545 TBAAInfo);
4546 } else {
4547 assert((lhs || rhs) &&(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4548, __PRETTY_FUNCTION__))
4548 "both operands of glvalue conditional are throw-expressions?")(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4548, __PRETTY_FUNCTION__))
;
4549 return lhs ? *lhs : *rhs;
4550 }
4551}
4552
4553/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4554/// type. If the cast is to a reference, we can have the usual lvalue result,
4555/// otherwise if a cast is needed by the code generator in an lvalue context,
4556/// then it must mean that we need the address of an aggregate in order to
4557/// access one of its members. This can happen for all the reasons that casts
4558/// are permitted with aggregate result, including noop aggregate casts, and
4559/// cast from scalar to union.
4560LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
4561 switch (E->getCastKind()) {
4562 case CK_ToVoid:
4563 case CK_BitCast:
4564 case CK_LValueToRValueBitCast:
4565 case CK_ArrayToPointerDecay:
4566 case CK_FunctionToPointerDecay:
4567 case CK_NullToMemberPointer:
4568 case CK_NullToPointer:
4569 case CK_IntegralToPointer:
4570 case CK_PointerToIntegral:
4571 case CK_PointerToBoolean:
4572 case CK_VectorSplat:
4573 case CK_IntegralCast:
4574 case CK_BooleanToSignedIntegral:
4575 case CK_IntegralToBoolean:
4576 case CK_IntegralToFloating:
4577 case CK_FloatingToIntegral:
4578 case CK_FloatingToBoolean:
4579 case CK_FloatingCast:
4580 case CK_FloatingRealToComplex:
4581 case CK_FloatingComplexToReal:
4582 case CK_FloatingComplexToBoolean:
4583 case CK_FloatingComplexCast:
4584 case CK_FloatingComplexToIntegralComplex:
4585 case CK_IntegralRealToComplex:
4586 case CK_IntegralComplexToReal:
4587 case CK_IntegralComplexToBoolean:
4588 case CK_IntegralComplexCast:
4589 case CK_IntegralComplexToFloatingComplex:
4590 case CK_DerivedToBaseMemberPointer:
4591 case CK_BaseToDerivedMemberPointer:
4592 case CK_MemberPointerToBoolean:
4593 case CK_ReinterpretMemberPointer:
4594 case CK_AnyPointerToBlockPointerCast:
4595 case CK_ARCProduceObject:
4596 case CK_ARCConsumeObject:
4597 case CK_ARCReclaimReturnedObject:
4598 case CK_ARCExtendBlockObject:
4599 case CK_CopyAndAutoreleaseBlockObject:
4600 case CK_IntToOCLSampler:
4601 case CK_FloatingToFixedPoint:
4602 case CK_FixedPointToFloating:
4603 case CK_FixedPointCast:
4604 case CK_FixedPointToBoolean:
4605 case CK_FixedPointToIntegral:
4606 case CK_IntegralToFixedPoint:
4607 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
4608
4609 case CK_Dependent:
4610 llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4610)
;
4611
4612 case CK_BuiltinFnToFnPtr:
4613 llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4613)
;
4614
4615 // These are never l-values; just use the aggregate emission code.
4616 case CK_NonAtomicToAtomic:
4617 case CK_AtomicToNonAtomic:
4618 return EmitAggExprToLValue(E);
4619
4620 case CK_Dynamic: {
4621 LValue LV = EmitLValue(E->getSubExpr());
4622 Address V = LV.getAddress(*this);
4623 const auto *DCE = cast<CXXDynamicCastExpr>(E);
4624 return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
4625 }
4626
4627 case CK_ConstructorConversion:
4628 case CK_UserDefinedConversion:
4629 case CK_CPointerToObjCPointerCast:
4630 case CK_BlockPointerToObjCPointerCast:
4631 case CK_NoOp:
4632 case CK_LValueToRValue:
4633 return EmitLValue(E->getSubExpr());
4634
4635 case CK_UncheckedDerivedToBase:
4636 case CK_DerivedToBase: {
4637 const auto *DerivedClassTy =
4638 E->getSubExpr()->getType()->castAs<RecordType>();
4639 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4640
4641 LValue LV = EmitLValue(E->getSubExpr());
4642 Address This = LV.getAddress(*this);
4643
4644 // Perform the derived-to-base conversion
4645 Address Base = GetAddressOfBaseClass(
4646 This, DerivedClassDecl, E->path_begin(), E->path_end(),
4647 /*NullCheckValue=*/false, E->getExprLoc());
4648
4649 // TODO: Support accesses to members of base classes in TBAA. For now, we
4650 // conservatively pretend that the complete object is of the base class
4651 // type.
4652 return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
4653 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4654 }
4655 case CK_ToUnion:
4656 return EmitAggExprToLValue(E);
4657 case CK_BaseToDerived: {
4658 const auto *DerivedClassTy = E->getType()->castAs<RecordType>();
4659 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4660
4661 LValue LV = EmitLValue(E->getSubExpr());
4662
4663 // Perform the base-to-derived conversion
4664 Address Derived = GetAddressOfDerivedClass(
4665 LV.getAddress(*this), DerivedClassDecl, E->path_begin(), E->path_end(),
4666 /*NullCheckValue=*/false);
4667
4668 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
4669 // performed and the object is not of the derived type.
4670 if (sanitizePerformTypeCheck())
4671 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
4672 Derived.getPointer(), E->getType());
4673
4674 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
4675 EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
4676 /*MayBeNull=*/false, CFITCK_DerivedCast,
4677 E->getBeginLoc());
4678
4679 return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
4680 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4681 }
4682 case CK_LValueBitCast: {
4683 // This must be a reinterpret_cast (or c-style equivalent).
4684 const auto *CE = cast<ExplicitCastExpr>(E);
4685
4686 CGM.EmitExplicitCastExprType(CE, this);
4687 LValue LV = EmitLValue(E->getSubExpr());
4688 Address V = Builder.CreateBitCast(LV.getAddress(*this),
4689 ConvertType(CE->getTypeAsWritten()));
4690
4691 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
4692 EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
4693 /*MayBeNull=*/false, CFITCK_UnrelatedCast,
4694 E->getBeginLoc());
4695
4696 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4697 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4698 }
4699 case CK_AddressSpaceConversion: {
4700 LValue LV = EmitLValue(E->getSubExpr());
4701 QualType DestTy = getContext().getPointerType(E->getType());
4702 llvm::Value *V = getTargetHooks().performAddrSpaceCast(
4703 *this, LV.getPointer(*this),
4704 E->getSubExpr()->getType().getAddressSpace(),
4705 E->getType().getAddressSpace(), ConvertType(DestTy));
4706 return MakeAddrLValue(Address(V, LV.getAddress(*this).getAlignment()),
4707 E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
4708 }
4709 case CK_ObjCObjectLValueCast: {
4710 LValue LV = EmitLValue(E->getSubExpr());
4711 Address V = Builder.CreateElementBitCast(LV.getAddress(*this),
4712 ConvertType(E->getType()));
4713 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4714 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4715 }
4716 case CK_ZeroToOCLOpaqueType:
4717 llvm_unreachable("NULL to OpenCL opaque type lvalue cast is not valid")::llvm::llvm_unreachable_internal("NULL to OpenCL opaque type lvalue cast is not valid"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4717)
;
4718 }
4719
4720 llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4720)
;
4721}
4722
4723LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
4724 assert(OpaqueValueMappingData::shouldBindAsLValue(e))((OpaqueValueMappingData::shouldBindAsLValue(e)) ? static_cast
<void> (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4724, __PRETTY_FUNCTION__))
;
4725 return getOrCreateOpaqueLValueMapping(e);
4726}
4727
4728LValue
4729CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
4730 assert(OpaqueValueMapping::shouldBindAsLValue(e))((OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4730, __PRETTY_FUNCTION__))
;
4731
4732 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
4733 it = OpaqueLValues.find(e);
4734
4735 if (it != OpaqueLValues.end())
4736 return it->second;
4737
4738 assert(e->isUnique() && "LValue for a nonunique OVE hasn't been emitted")((e->isUnique() && "LValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"LValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4738, __PRETTY_FUNCTION__))
;
4739 return EmitLValue(e->getSourceExpr());
4740}
4741
4742RValue
4743CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
4744 assert(!OpaqueValueMapping::shouldBindAsLValue(e))((!OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4744, __PRETTY_FUNCTION__))
;
4745
4746 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
4747 it = OpaqueRValues.find(e);
4748
4749 if (it != OpaqueRValues.end())
4750 return it->second;
4751
4752 assert(e->isUnique() && "RValue for a nonunique OVE hasn't been emitted")((e->isUnique() && "RValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"RValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4752, __PRETTY_FUNCTION__))
;
4753 return EmitAnyExpr(e->getSourceExpr());
4754}
4755
4756RValue CodeGenFunction::EmitRValueForField(LValue LV,
4757 const FieldDecl *FD,
4758 SourceLocation Loc) {
4759 QualType FT = FD->getType();
4760 LValue FieldLV = EmitLValueForField(LV, FD);
4761 switch (getEvaluationKind(FT)) {
4762 case TEK_Complex:
4763 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
4764 case TEK_Aggregate:
4765 return FieldLV.asAggregateRValue(*this);
4766 case TEK_Scalar:
4767 // This routine is used to load fields one-by-one to perform a copy, so
4768 // don't load reference fields.
4769 if (FD->getType()->isReferenceType())
4770 return RValue::get(FieldLV.getPointer(*this));
4771 // Call EmitLoadOfScalar except when the lvalue is a bitfield to emit a
4772 // primitive load.
4773 if (FieldLV.isBitField())
4774 return EmitLoadOfLValue(FieldLV, Loc);
4775 return RValue::get(EmitLoadOfScalar(FieldLV, Loc));
4776 }
4777 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4777)
;
4778}
4779
4780//===--------------------------------------------------------------------===//
4781// Expression Emission
4782//===--------------------------------------------------------------------===//
4783
4784RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
4785 ReturnValueSlot ReturnValue) {
4786 // Builtins never have block type.
4787 if (E->getCallee()->getType()->isBlockPointerType())
4788 return EmitBlockCallExpr(E, ReturnValue);
4789
4790 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
4791 return EmitCXXMemberCallExpr(CE, ReturnValue);
4792
4793 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
4794 return EmitCUDAKernelCallExpr(CE, ReturnValue);
4795
4796 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
4797 if (const CXXMethodDecl *MD =
4798 dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
4799 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
4800
4801 CGCallee callee = EmitCallee(E->getCallee());
4802
4803 if (callee.isBuiltin()) {
4804 return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
4805 E, ReturnValue);
4806 }
4807
4808 if (callee.isPseudoDestructor()) {
4809 return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
4810 }
4811
4812 return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
4813}
4814
4815/// Emit a CallExpr without considering whether it might be a subclass.
4816RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
4817 ReturnValueSlot ReturnValue) {
4818 CGCallee Callee = EmitCallee(E->getCallee());
4819 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4820}
4821
4822static CGCallee EmitDirectCallee(CodeGenFunction &CGF, GlobalDecl GD) {
4823 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
4824
4825 if (auto builtinID = FD->getBuiltinID()) {
4826 // Replaceable builtin provide their own implementation of a builtin. Unless
4827 // we are in the builtin implementation itself, don't call the actual
4828 // builtin. If we are in the builtin implementation, avoid trivial infinite
4829 // recursion.
4830 if (!FD->isInlineBuiltinDeclaration() ||
4831 CGF.CurFn->getName() == FD->getName())
4832 return CGCallee::forBuiltin(builtinID, FD);
4833 }
4834
4835 llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, GD);
4836 return CGCallee::forDirect(calleePtr, GD);
4837}
4838
4839CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
4840 E = E->IgnoreParens();
4841
4842 // Look through function-to-pointer decay.
4843 if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
4844 if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
4845 ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
4846 return EmitCallee(ICE->getSubExpr());
4847 }
4848
4849 // Resolve direct calls.
4850 } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
4851 if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
4852 return EmitDirectCallee(*this, FD);
4853 }
4854 } else if (auto ME = dyn_cast<MemberExpr>(E)) {
4855 if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
4856 EmitIgnoredExpr(ME->getBase());
4857 return EmitDirectCallee(*this, FD);
4858 }
4859
4860 // Look through template substitutions.
4861 } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
4862 return EmitCallee(NTTP->getReplacement());
4863
4864 // Treat pseudo-destructor calls differently.
4865 } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
4866 return CGCallee::forPseudoDestructor(PDE);
4867 }
4868
4869 // Otherwise, we have an indirect reference.
4870 llvm::Value *calleePtr;
4871 QualType functionType;
4872 if (auto ptrType = E->getType()->getAs<PointerType>()) {
4873 calleePtr = EmitScalarExpr(E);
4874 functionType = ptrType->getPointeeType();
4875 } else {
4876 functionType = E->getType();
4877 calleePtr = EmitLValue(E).getPointer(*this);
4878 }
4879 assert(functionType->isFunctionType())((functionType->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("functionType->isFunctionType()", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4879, __PRETTY_FUNCTION__))
;
4880
4881 GlobalDecl GD;
4882 if (const auto *VD =
4883 dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
4884 GD = GlobalDecl(VD);
4885
4886 CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
4887 CGCallee callee(calleeInfo, calleePtr);
4888 return callee;
4889}
4890
4891LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
4892 // Comma expressions just emit their LHS then their RHS as an l-value.
4893 if (E->getOpcode() == BO_Comma) {
4894 EmitIgnoredExpr(E->getLHS());
4895 EnsureInsertPoint();
4896 return EmitLValue(E->getRHS());
4897 }
4898
4899 if (E->getOpcode() == BO_PtrMemD ||
4900 E->getOpcode() == BO_PtrMemI)
4901 return EmitPointerToDataMemberBinaryExpr(E);
4902
4903 assert(E->getOpcode() == BO_Assign && "unexpected binary l-value")((E->getOpcode() == BO_Assign && "unexpected binary l-value"
) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_Assign && \"unexpected binary l-value\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4903, __PRETTY_FUNCTION__))
;
4904
4905 // Note that in all of these cases, __block variables need the RHS
4906 // evaluated first just in case the variable gets moved by the RHS.
4907
4908 switch (getEvaluationKind(E->getType())) {
4909 case TEK_Scalar: {
4910 switch (E->getLHS()->getType().getObjCLifetime()) {
4911 case Qualifiers::OCL_Strong:
4912 return EmitARCStoreStrong(E, /*ignored*/ false).first;
4913
4914 case Qualifiers::OCL_Autoreleasing:
4915 return EmitARCStoreAutoreleasing(E).first;
4916
4917 // No reason to do any of these differently.
4918 case Qualifiers::OCL_None:
4919 case Qualifiers::OCL_ExplicitNone:
4920 case Qualifiers::OCL_Weak:
4921 break;
4922 }
4923
4924 RValue RV = EmitAnyExpr(E->getRHS());
4925 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
4926 if (RV.isScalar())
4927 EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
4928 EmitStoreThroughLValue(RV, LV);
4929 if (getLangOpts().OpenMP)
4930 CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
4931 E->getLHS());
4932 return LV;
4933 }
4934
4935 case TEK_Complex:
4936 return EmitComplexAssignmentLValue(E);
4937
4938 case TEK_Aggregate:
4939 return EmitAggExprToLValue(E);
4940 }
4941 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4941)
;
4942}
4943
4944LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
4945 RValue RV = EmitCallExpr(E);
4946
4947 if (!RV.isScalar())
4948 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4949 AlignmentSource::Decl);
4950
4951 assert(E->getCallReturnType(getContext())->isReferenceType() &&((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4953, __PRETTY_FUNCTION__))
4952 "Can't have a scalar return unless the return type is a "((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4953, __PRETTY_FUNCTION__))
4953 "reference type!")((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4953, __PRETTY_FUNCTION__))
;
4954
4955 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4956}
4957
4958LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
4959 // FIXME: This shouldn't require another copy.
4960 return EmitAggExprToLValue(E);
4961}
4962
4963LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
4964 assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4965, __PRETTY_FUNCTION__))
4965 && "binding l-value to type which needs a temporary")((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 4965, __PRETTY_FUNCTION__))
;
4966 AggValueSlot Slot = CreateAggTemp(E->getType());
4967 EmitCXXConstructExpr(E, Slot);
4968 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4969}
4970
4971LValue
4972CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
4973 return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4974}
4975
4976Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
4977 return Builder.CreateElementBitCast(CGM.GetAddrOfMSGuidDecl(E->getGuidDecl()),
4978 ConvertType(E->getType()));
4979}
4980
4981LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
4982 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
4983 AlignmentSource::Decl);
4984}
4985
4986LValue
4987CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
4988 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4989 Slot.setExternallyDestructed();
4990 EmitAggExpr(E->getSubExpr(), Slot);
4991 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
4992 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4993}
4994
4995LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
4996 RValue RV = EmitObjCMessageExpr(E);
4997
4998 if (!RV.isScalar())
4999 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
5000 AlignmentSource::Decl);
5001
5002 assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5004, __PRETTY_FUNCTION__))
5003 "Can't have a scalar return unless the return type is a "((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5004, __PRETTY_FUNCTION__))
5004 "reference type!")((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5004, __PRETTY_FUNCTION__))
;
5005
5006 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
5007}
5008
5009LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
5010 Address V =
5011 CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
5012 return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
5013}
5014
5015llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
5016 const ObjCIvarDecl *Ivar) {
5017 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
5018}
5019
5020LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
5021 llvm::Value *BaseValue,
5022 const ObjCIvarDecl *Ivar,
5023 unsigned CVRQualifiers) {
5024 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
5025 Ivar, CVRQualifiers);
5026}
5027
5028LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
5029 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
5030 llvm::Value *BaseValue = nullptr;
5031 const Expr *BaseExpr = E->getBase();
5032 Qualifiers BaseQuals;
5033 QualType ObjectTy;
5034 if (E->isArrow()) {
5035 BaseValue = EmitScalarExpr(BaseExpr);
5036 ObjectTy = BaseExpr->getType()->getPointeeType();
5037 BaseQuals = ObjectTy.getQualifiers();
5038 } else {
5039 LValue BaseLV = EmitLValue(BaseExpr);
5040 BaseValue = BaseLV.getPointer(*this);
5041 ObjectTy = BaseExpr->getType();
5042 BaseQuals = ObjectTy.getQualifiers();
5043 }
5044
5045 LValue LV =
5046 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
5047 BaseQuals.getCVRQualifiers());
5048 setObjCGCLValueClass(getContext(), E, LV);
5049 return LV;
5050}
5051
5052LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
5053 // Can only get l-value for message expression returning aggregate type
5054 RValue RV = EmitAnyExprToTemp(E);
5055 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
5056 AlignmentSource::Decl);
5057}
5058
5059RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
5060 const CallExpr *E, ReturnValueSlot ReturnValue,
5061 llvm::Value *Chain) {
5062 // Get the actual function type. The callee type will always be a pointer to
5063 // function type or a block pointer type.
5064 assert(CalleeType->isFunctionPointerType() &&((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5065, __PRETTY_FUNCTION__))
5065 "Call must have function pointer type!")((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5065, __PRETTY_FUNCTION__))
;
5066
5067 const Decl *TargetDecl =
5068 OrigCallee.getAbstractInfo().getCalleeDecl().getDecl();
5069
5070 CalleeType = getContext().getCanonicalType(CalleeType);
5071
5072 auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
5073
5074 CGCallee Callee = OrigCallee;
5075
5076 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
5077 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
5078 if (llvm::Constant *PrefixSig =
5079 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
5080 SanitizerScope SanScope(this);
5081 // Remove any (C++17) exception specifications, to allow calling e.g. a
5082 // noexcept function through a non-noexcept pointer.
5083 auto ProtoTy =
5084 getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
5085 llvm::Constant *FTRTTIConst =
5086 CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
5087 llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
5088 llvm::StructType *PrefixStructTy = llvm::StructType::get(
5089 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
5090
5091 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5092
5093 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
5094 CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
5095 llvm::Value *CalleeSigPtr =
5096 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
5097 llvm::Value *CalleeSig =
5098 Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
5099 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
5100
5101 llvm::BasicBlock *Cont = createBasicBlock("cont");
5102 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
5103 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
5104
5105 EmitBlock(TypeCheck);
5106 llvm::Value *CalleeRTTIPtr =
5107 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
5108 llvm::Value *CalleeRTTIEncoded =
5109 Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
5110 llvm::Value *CalleeRTTI =
5111 DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
5112 llvm::Value *CalleeRTTIMatch =
5113 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
5114 llvm::Constant *StaticData[] = {EmitCheckSourceLocation(E->getBeginLoc()),
5115 EmitCheckTypeDescriptor(CalleeType)};
5116 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
5117 SanitizerHandler::FunctionTypeMismatch, StaticData,
5118 {CalleePtr, CalleeRTTI, FTRTTIConst});
5119
5120 Builder.CreateBr(Cont);
5121 EmitBlock(Cont);
5122 }
5123 }
5124
5125 const auto *FnType = cast<FunctionType>(PointeeType);
5126
5127 // If we are checking indirect calls and this call is indirect, check that the
5128 // function pointer is a member of the bit set for the function type.
5129 if (SanOpts.has(SanitizerKind::CFIICall) &&
5130 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
5131 SanitizerScope SanScope(this);
5132 EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
5133
5134 llvm::Metadata *MD;
5135 if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
5136 MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
5137 else
5138 MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
5139
5140 llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
5141
5142 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5143 llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
5144 llvm::Value *TypeTest = Builder.CreateCall(
5145 CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
5146
5147 auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
5148 llvm::Constant *StaticData[] = {
5149 llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
5150 EmitCheckSourceLocation(E->getBeginLoc()),
5151 EmitCheckTypeDescriptor(QualType(FnType, 0)),
5152 };
5153 if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
5154 EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
5155 CastedCallee, StaticData);
5156 } else {
5157 EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
5158 SanitizerHandler::CFICheckFail, StaticData,
5159 {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
5160 }
5161 }
5162
5163 CallArgList Args;
5164 if (Chain)
5165 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
5166 CGM.getContext().VoidPtrTy);
5167
5168 // C++17 requires that we evaluate arguments to a call using assignment syntax
5169 // right-to-left, and that we evaluate arguments to certain other operators
5170 // left-to-right. Note that we allow this to override the order dictated by
5171 // the calling convention on the MS ABI, which means that parameter
5172 // destruction order is not necessarily reverse construction order.
5173 // FIXME: Revisit this based on C++ committee response to unimplementability.
5174 EvaluationOrder Order = EvaluationOrder::Default;
5175 if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
5176 if (OCE->isAssignmentOp())
5177 Order = EvaluationOrder::ForceRightToLeft;
5178 else {
5179 switch (OCE->getOperator()) {
5180 case OO_LessLess:
5181 case OO_GreaterGreater:
5182 case OO_AmpAmp:
5183 case OO_PipePipe:
5184 case OO_Comma:
5185 case OO_ArrowStar:
5186 Order = EvaluationOrder::ForceLeftToRight;
5187 break;
5188 default:
5189 break;
5190 }
5191 }
5192 }
5193
5194 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
5195 E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
5196
5197 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
5198 Args, FnType, /*ChainCall=*/Chain);
5199
5200 // C99 6.5.2.2p6:
5201 // If the expression that denotes the called function has a type
5202 // that does not include a prototype, [the default argument
5203 // promotions are performed]. If the number of arguments does not
5204 // equal the number of parameters, the behavior is undefined. If
5205 // the function is defined with a type that includes a prototype,
5206 // and either the prototype ends with an ellipsis (, ...) or the
5207 // types of the arguments after promotion are not compatible with
5208 // the types of the parameters, the behavior is undefined. If the
5209 // function is defined with a type that does not include a
5210 // prototype, and the types of the arguments after promotion are
5211 // not compatible with those of the parameters after promotion,
5212 // the behavior is undefined [except in some trivial cases].
5213 // That is, in the general case, we should assume that a call
5214 // through an unprototyped function type works like a *non-variadic*
5215 // call. The way we make this work is to cast to the exact type
5216 // of the promoted arguments.
5217 //
5218 // Chain calls use this same code path to add the invisible chain parameter
5219 // to the function type.
5220 if (isa<FunctionNoProtoType>(FnType) || Chain) {
5221 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
5222 int AS = Callee.getFunctionPointer()->getType()->getPointerAddressSpace();
5223 CalleeTy = CalleeTy->getPointerTo(AS);
5224
5225 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5226 CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
5227 Callee.setFunctionPointer(CalleePtr);
5228 }
5229
5230 llvm::CallBase *CallOrInvoke = nullptr;
5231 RValue Call = EmitCall(FnInfo, Callee, ReturnValue, Args, &CallOrInvoke,
5232 E->getExprLoc());
5233
5234 // Generate function declaration DISuprogram in order to be used
5235 // in debug info about call sites.
5236 if (CGDebugInfo *DI = getDebugInfo()) {
5237 if (auto *CalleeDecl = dyn_cast_or_null<FunctionDecl>(TargetDecl))
5238 DI->EmitFuncDeclForCallSite(CallOrInvoke, QualType(FnType, 0),
5239 CalleeDecl);
5240 }
5241
5242 return Call;
5243}
5244
5245LValue CodeGenFunction::
5246EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
5247 Address BaseAddr = Address::invalid();
5248 if (E->getOpcode() == BO_PtrMemI) {
5249 BaseAddr = EmitPointerWithAlignment(E->getLHS());
5250 } else {
5251 BaseAddr = EmitLValue(E->getLHS()).getAddress(*this);
5252 }
5253
5254 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
5255 const auto *MPT = E->getRHS()->getType()->castAs<MemberPointerType>();
5256
5257 LValueBaseInfo BaseInfo;
5258 TBAAAccessInfo TBAAInfo;
5259 Address MemberAddr =
5260 EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
5261 &TBAAInfo);
5262
5263 return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
5264}
5265
5266/// Given the address of a temporary variable, produce an r-value of
5267/// its type.
5268RValue CodeGenFunction::convertTempToRValue(Address addr,
5269 QualType type,
5270 SourceLocation loc) {
5271 LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
5272 switch (getEvaluationKind(type)) {
5273 case TEK_Complex:
5274 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
5275 case TEK_Aggregate:
5276 return lvalue.asAggregateRValue(*this);
5277 case TEK_Scalar:
5278 return RValue::get(EmitLoadOfScalar(lvalue, loc));
5279 }
5280 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5280)
;
5281}
5282
5283void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
5284 assert(Val->getType()->isFPOrFPVectorTy())((Val->getType()->isFPOrFPVectorTy()) ? static_cast<
void> (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5284, __PRETTY_FUNCTION__))
;
5285 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
5286 return;
5287
5288 llvm::MDBuilder MDHelper(getLLVMContext());
5289 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
5290
5291 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
5292}
5293
5294namespace {
5295 struct LValueOrRValue {
5296 LValue LV;
5297 RValue RV;
5298 };
5299}
5300
5301static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
5302 const PseudoObjectExpr *E,
5303 bool forLValue,
5304 AggValueSlot slot) {
5305 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
5306
5307 // Find the result expression, if any.
5308 const Expr *resultExpr = E->getResultExpr();
5309 LValueOrRValue result;
5310
5311 for (PseudoObjectExpr::const_semantics_iterator
3
Loop condition is true. Entering loop body
5312 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2
Assuming 'i' is not equal to 'e'
5313 const Expr *semantic = *i;
5314
5315 // If this semantic expression is an opaque value, bind it
5316 // to the result of its source expression.
5317 if (const auto *ov
4.1
'ov' is null
= dyn_cast<OpaqueValueExpr>(semantic)) {
4
Assuming 'semantic' is not a 'OpaqueValueExpr'
5
Taking false branch
5318 // Skip unique OVEs.
5319 if (ov->isUnique()) {
5320 assert(ov != resultExpr &&((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5321, __PRETTY_FUNCTION__))
5321 "A unique OVE cannot be used as the result expression")((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-12~++20201129111111+e987fbdd85d/clang/lib/CodeGen/CGExpr.cpp"
, 5321, __PRETTY_FUNCTION__))
;
5322 continue;
5323 }
5324
5325 // If this is the result expression, we may need to evaluate
5326 // directly into the slot.
5327 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
5328 OVMA opaqueData;
5329 if (ov == resultExpr && ov->isRValue() && !forLValue &&
5330 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
5331 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
5332 LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
5333 AlignmentSource::Decl);
5334 opaqueData = OVMA::bind(CGF, ov, LV);
5335 result.RV = slot.asRValue();
5336
5337 // Otherwise, emit as normal.
5338 } else {
5339 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
5340
5341 // If this is the result, also evaluate the result now.
5342 if (ov == resultExpr) {
5343 if (forLValue)
5344 result.LV = CGF.EmitLValue(ov);
5345 else
5346 result.RV = CGF.EmitAnyExpr(ov, slot);
5347 }
5348 }
5349
5350 opaques.push_back(opaqueData);
5351
5352 // Otherwise, if the expression is the result, evaluate it
5353 // and remember the result.
5354 } else if (semantic == resultExpr) {
6
Assuming 'semantic' is not equal to 'resultExpr'
7
Taking false branch
5355 if (forLValue)
5356 result.LV = CGF.EmitLValue(semantic);
5357 else
5358 result.RV = CGF.EmitAnyExpr(semantic, slot);
5359
5360 // Otherwise, evaluate the expression in an ignored context.
5361 } else {
5362 CGF.EmitIgnoredExpr(semantic);
8
Calling 'CodeGenFunction::EmitIgnoredExpr'
5363 }
5364 }
5365
5366 // Unbind all the opaques now.
5367 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
5368 opaques[i].unbind(CGF);
5369
5370 return result;
5371}
5372
5373RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
5374 AggValueSlot slot) {
5375 return emitPseudoObjectExpr(*this, E, false, slot).RV;
1
Calling 'emitPseudoObjectExpr'
5376}
5377
5378LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
5379 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
5380}