Bug Summary

File:clang/lib/CodeGen/CGExpr.cpp
Warning:line 3802, column 7
Called C++ object pointer is null

Annotated Source Code

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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 CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/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~++20200926111128+c6c5629f2fb/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb=. -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-2020-09-26-161721-17566-1 -x c++ /build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/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~++20200926111128+c6c5629f2fb/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~++20200926111128+c6c5629f2fb/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~++20200926111128+c6c5629f2fb/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~++20200926111128+c6c5629f2fb/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 if (!E->getType()->isAnyComplexType())
191 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
192
193 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
194 Loc);
195}
196
197/// EmitIgnoredExpr - Emit code to compute the specified expression,
198/// ignoring the result.
199void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
200 if (E->isRValue())
9
Taking false branch
201 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
202
203 // Just emit it as an l-value and drop the result.
204 EmitLValue(E);
10
Calling 'CodeGenFunction::EmitLValue'
205}
206
207/// EmitAnyExpr - Emit code to compute the specified expression which
208/// can have any type. The result is returned as an RValue struct.
209/// If this is an aggregate expression, AggSlot indicates where the
210/// result should be returned.
211RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
212 AggValueSlot aggSlot,
213 bool ignoreResult) {
214 switch (getEvaluationKind(E->getType())) {
215 case TEK_Scalar:
216 return RValue::get(EmitScalarExpr(E, ignoreResult));
217 case TEK_Complex:
218 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
219 case TEK_Aggregate:
220 if (!ignoreResult && aggSlot.isIgnored())
221 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
222 EmitAggExpr(E, aggSlot);
223 return aggSlot.asRValue();
224 }
225 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 225)
;
226}
227
228/// EmitAnyExprToTemp - Similar to EmitAnyExpr(), however, the result will
229/// always be accessible even if no aggregate location is provided.
230RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
231 AggValueSlot AggSlot = AggValueSlot::ignored();
232
233 if (hasAggregateEvaluationKind(E->getType()))
234 AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
235 return EmitAnyExpr(E, AggSlot);
236}
237
238/// EmitAnyExprToMem - Evaluate an expression into a given memory
239/// location.
240void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
241 Address Location,
242 Qualifiers Quals,
243 bool IsInit) {
244 // FIXME: This function should take an LValue as an argument.
245 switch (getEvaluationKind(E->getType())) {
246 case TEK_Complex:
247 EmitComplexExprIntoLValue(E, MakeAddrLValue(Location, E->getType()),
248 /*isInit*/ false);
249 return;
250
251 case TEK_Aggregate: {
252 EmitAggExpr(E, AggValueSlot::forAddr(Location, Quals,
253 AggValueSlot::IsDestructed_t(IsInit),
254 AggValueSlot::DoesNotNeedGCBarriers,
255 AggValueSlot::IsAliased_t(!IsInit),
256 AggValueSlot::MayOverlap));
257 return;
258 }
259
260 case TEK_Scalar: {
261 RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
262 LValue LV = MakeAddrLValue(Location, E->getType());
263 EmitStoreThroughLValue(RV, LV);
264 return;
265 }
266 }
267 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 267)
;
268}
269
270static void
271pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
272 const Expr *E, Address ReferenceTemporary) {
273 // Objective-C++ ARC:
274 // If we are binding a reference to a temporary that has ownership, we
275 // need to perform retain/release operations on the temporary.
276 //
277 // FIXME: This should be looking at E, not M.
278 if (auto Lifetime = M->getType().getObjCLifetime()) {
279 switch (Lifetime) {
280 case Qualifiers::OCL_None:
281 case Qualifiers::OCL_ExplicitNone:
282 // Carry on to normal cleanup handling.
283 break;
284
285 case Qualifiers::OCL_Autoreleasing:
286 // Nothing to do; cleaned up by an autorelease pool.
287 return;
288
289 case Qualifiers::OCL_Strong:
290 case Qualifiers::OCL_Weak:
291 switch (StorageDuration Duration = M->getStorageDuration()) {
292 case SD_Static:
293 // Note: we intentionally do not register a cleanup to release
294 // the object on program termination.
295 return;
296
297 case SD_Thread:
298 // FIXME: We should probably register a cleanup in this case.
299 return;
300
301 case SD_Automatic:
302 case SD_FullExpression:
303 CodeGenFunction::Destroyer *Destroy;
304 CleanupKind CleanupKind;
305 if (Lifetime == Qualifiers::OCL_Strong) {
306 const ValueDecl *VD = M->getExtendingDecl();
307 bool Precise =
308 VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
309 CleanupKind = CGF.getARCCleanupKind();
310 Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
311 : &CodeGenFunction::destroyARCStrongImprecise;
312 } else {
313 // __weak objects always get EH cleanups; otherwise, exceptions
314 // could cause really nasty crashes instead of mere leaks.
315 CleanupKind = NormalAndEHCleanup;
316 Destroy = &CodeGenFunction::destroyARCWeak;
317 }
318 if (Duration == SD_FullExpression)
319 CGF.pushDestroy(CleanupKind, ReferenceTemporary,
320 M->getType(), *Destroy,
321 CleanupKind & EHCleanup);
322 else
323 CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
324 M->getType(),
325 *Destroy, CleanupKind & EHCleanup);
326 return;
327
328 case SD_Dynamic:
329 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 329)
;
330 }
331 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 331)
;
332 }
333 }
334
335 CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
336 if (const RecordType *RT =
337 E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
338 // Get the destructor for the reference temporary.
339 auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
340 if (!ClassDecl->hasTrivialDestructor())
341 ReferenceTemporaryDtor = ClassDecl->getDestructor();
342 }
343
344 if (!ReferenceTemporaryDtor)
345 return;
346
347 // Call the destructor for the temporary.
348 switch (M->getStorageDuration()) {
349 case SD_Static:
350 case SD_Thread: {
351 llvm::FunctionCallee CleanupFn;
352 llvm::Constant *CleanupArg;
353 if (E->getType()->isArrayType()) {
354 CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
355 ReferenceTemporary, E->getType(),
356 CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
357 dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
358 CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
359 } else {
360 CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
361 GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
362 CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
363 }
364 CGF.CGM.getCXXABI().registerGlobalDtor(
365 CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
366 break;
367 }
368
369 case SD_FullExpression:
370 CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
371 CodeGenFunction::destroyCXXObject,
372 CGF.getLangOpts().Exceptions);
373 break;
374
375 case SD_Automatic:
376 CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
377 ReferenceTemporary, E->getType(),
378 CodeGenFunction::destroyCXXObject,
379 CGF.getLangOpts().Exceptions);
380 break;
381
382 case SD_Dynamic:
383 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 383)
;
384 }
385}
386
387static Address createReferenceTemporary(CodeGenFunction &CGF,
388 const MaterializeTemporaryExpr *M,
389 const Expr *Inner,
390 Address *Alloca = nullptr) {
391 auto &TCG = CGF.getTargetHooks();
392 switch (M->getStorageDuration()) {
393 case SD_FullExpression:
394 case SD_Automatic: {
395 // If we have a constant temporary array or record try to promote it into a
396 // constant global under the same rules a normal constant would've been
397 // promoted. This is easier on the optimizer and generally emits fewer
398 // instructions.
399 QualType Ty = Inner->getType();
400 if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
401 (Ty->isArrayType() || Ty->isRecordType()) &&
402 CGF.CGM.isTypeConstant(Ty, true))
403 if (auto Init = ConstantEmitter(CGF).tryEmitAbstract(Inner, Ty)) {
404 if (auto AddrSpace = CGF.getTarget().getConstantAddressSpace()) {
405 auto AS = AddrSpace.getValue();
406 auto *GV = new llvm::GlobalVariable(
407 CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
408 llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp", nullptr,
409 llvm::GlobalValue::NotThreadLocal,
410 CGF.getContext().getTargetAddressSpace(AS));
411 CharUnits alignment = CGF.getContext().getTypeAlignInChars(Ty);
412 GV->setAlignment(alignment.getAsAlign());
413 llvm::Constant *C = GV;
414 if (AS != LangAS::Default)
415 C = TCG.performAddrSpaceCast(
416 CGF.CGM, GV, AS, LangAS::Default,
417 GV->getValueType()->getPointerTo(
418 CGF.getContext().getTargetAddressSpace(LangAS::Default)));
419 // FIXME: Should we put the new global into a COMDAT?
420 return Address(C, alignment);
421 }
422 }
423 return CGF.CreateMemTemp(Ty, "ref.tmp", Alloca);
424 }
425 case SD_Thread:
426 case SD_Static:
427 return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
428
429 case SD_Dynamic:
430 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 430)
;
431 }
432 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 432)
;
433}
434
435/// Helper method to check if the underlying ABI is AAPCS
436static bool isAAPCS(const TargetInfo &TargetInfo) {
437 return TargetInfo.getABI().startswith("aapcs");
438}
439
440LValue CodeGenFunction::
441EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
442 const Expr *E = M->getSubExpr();
443
444 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 446, __PRETTY_FUNCTION__))
445 !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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 446, __PRETTY_FUNCTION__))
446 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 446, __PRETTY_FUNCTION__))
;
447
448 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
449 // as that will cause the lifetime adjustment to be lost for ARC
450 auto ownership = M->getType().getObjCLifetime();
451 if (ownership != Qualifiers::OCL_None &&
452 ownership != Qualifiers::OCL_ExplicitNone) {
453 Address Object = createReferenceTemporary(*this, M, E);
454 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
455 Object = Address(llvm::ConstantExpr::getBitCast(Var,
456 ConvertTypeForMem(E->getType())
457 ->getPointerTo(Object.getAddressSpace())),
458 Object.getAlignment());
459
460 // createReferenceTemporary will promote the temporary to a global with a
461 // constant initializer if it can. It can only do this to a value of
462 // ARC-manageable type if the value is global and therefore "immune" to
463 // ref-counting operations. Therefore we have no need to emit either a
464 // dynamic initialization or a cleanup and we can just return the address
465 // of the temporary.
466 if (Var->hasInitializer())
467 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
468
469 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
470 }
471 LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
472 AlignmentSource::Decl);
473
474 switch (getEvaluationKind(E->getType())) {
475 default: llvm_unreachable("expected scalar or aggregate expression")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 475)
;
476 case TEK_Scalar:
477 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
478 break;
479 case TEK_Aggregate: {
480 EmitAggExpr(E, AggValueSlot::forAddr(Object,
481 E->getType().getQualifiers(),
482 AggValueSlot::IsDestructed,
483 AggValueSlot::DoesNotNeedGCBarriers,
484 AggValueSlot::IsNotAliased,
485 AggValueSlot::DoesNotOverlap));
486 break;
487 }
488 }
489
490 pushTemporaryCleanup(*this, M, E, Object);
491 return RefTempDst;
492 }
493
494 SmallVector<const Expr *, 2> CommaLHSs;
495 SmallVector<SubobjectAdjustment, 2> Adjustments;
496 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
497
498 for (const auto &Ignored : CommaLHSs)
499 EmitIgnoredExpr(Ignored);
500
501 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
502 if (opaque->getType()->isRecordType()) {
503 assert(Adjustments.empty())((Adjustments.empty()) ? static_cast<void> (0) : __assert_fail
("Adjustments.empty()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 503, __PRETTY_FUNCTION__))
;
504 return EmitOpaqueValueLValue(opaque);
505 }
506 }
507
508 // Create and initialize the reference temporary.
509 Address Alloca = Address::invalid();
510 Address Object = createReferenceTemporary(*this, M, E, &Alloca);
511 if (auto *Var = dyn_cast<llvm::GlobalVariable>(
512 Object.getPointer()->stripPointerCasts())) {
513 Object = Address(llvm::ConstantExpr::getBitCast(
514 cast<llvm::Constant>(Object.getPointer()),
515 ConvertTypeForMem(E->getType())->getPointerTo()),
516 Object.getAlignment());
517 // If the temporary is a global and has a constant initializer or is a
518 // constant temporary that we promoted to a global, we may have already
519 // initialized it.
520 if (!Var->hasInitializer()) {
521 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
522 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
523 }
524 } else {
525 switch (M->getStorageDuration()) {
526 case SD_Automatic:
527 if (auto *Size = EmitLifetimeStart(
528 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
529 Alloca.getPointer())) {
530 pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
531 Alloca, Size);
532 }
533 break;
534
535 case SD_FullExpression: {
536 if (!ShouldEmitLifetimeMarkers)
537 break;
538
539 // Avoid creating a conditional cleanup just to hold an llvm.lifetime.end
540 // marker. Instead, start the lifetime of a conditional temporary earlier
541 // so that it's unconditional. Don't do this with sanitizers which need
542 // more precise lifetime marks.
543 ConditionalEvaluation *OldConditional = nullptr;
544 CGBuilderTy::InsertPoint OldIP;
545 if (isInConditionalBranch() && !E->getType().isDestructedType() &&
546 !SanOpts.has(SanitizerKind::HWAddress) &&
547 !SanOpts.has(SanitizerKind::Memory) &&
548 !CGM.getCodeGenOpts().SanitizeAddressUseAfterScope) {
549 OldConditional = OutermostConditional;
550 OutermostConditional = nullptr;
551
552 OldIP = Builder.saveIP();
553 llvm::BasicBlock *Block = OldConditional->getStartingBlock();
554 Builder.restoreIP(CGBuilderTy::InsertPoint(
555 Block, llvm::BasicBlock::iterator(Block->back())));
556 }
557
558 if (auto *Size = EmitLifetimeStart(
559 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
560 Alloca.getPointer())) {
561 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
562 Size);
563 }
564
565 if (OldConditional) {
566 OutermostConditional = OldConditional;
567 Builder.restoreIP(OldIP);
568 }
569 break;
570 }
571
572 default:
573 break;
574 }
575 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
576 }
577 pushTemporaryCleanup(*this, M, E, Object);
578
579 // Perform derived-to-base casts and/or field accesses, to get from the
580 // temporary object we created (and, potentially, for which we extended
581 // the lifetime) to the subobject we're binding the reference to.
582 for (unsigned I = Adjustments.size(); I != 0; --I) {
583 SubobjectAdjustment &Adjustment = Adjustments[I-1];
584 switch (Adjustment.Kind) {
585 case SubobjectAdjustment::DerivedToBaseAdjustment:
586 Object =
587 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
588 Adjustment.DerivedToBase.BasePath->path_begin(),
589 Adjustment.DerivedToBase.BasePath->path_end(),
590 /*NullCheckValue=*/ false, E->getExprLoc());
591 break;
592
593 case SubobjectAdjustment::FieldAdjustment: {
594 LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
595 LV = EmitLValueForField(LV, Adjustment.Field);
596 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 597, __PRETTY_FUNCTION__))
597 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 597, __PRETTY_FUNCTION__))
;
598 Object = LV.getAddress(*this);
599 break;
600 }
601
602 case SubobjectAdjustment::MemberPointerAdjustment: {
603 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
604 Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
605 Adjustment.Ptr.MPT);
606 break;
607 }
608 }
609 }
610
611 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
612}
613
614RValue
615CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
616 // Emit the expression as an lvalue.
617 LValue LV = EmitLValue(E);
618 assert(LV.isSimple())((LV.isSimple()) ? static_cast<void> (0) : __assert_fail
("LV.isSimple()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 618, __PRETTY_FUNCTION__))
;
619 llvm::Value *Value = LV.getPointer(*this);
620
621 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
622 // C++11 [dcl.ref]p5 (as amended by core issue 453):
623 // If a glvalue to which a reference is directly bound designates neither
624 // an existing object or function of an appropriate type nor a region of
625 // storage of suitable size and alignment to contain an object of the
626 // reference's type, the behavior is undefined.
627 QualType Ty = E->getType();
628 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
629 }
630
631 return RValue::get(Value);
632}
633
634
635/// getAccessedFieldNo - Given an encoded value and a result number, return the
636/// input field number being accessed.
637unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
638 const llvm::Constant *Elts) {
639 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
640 ->getZExtValue();
641}
642
643/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
644static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
645 llvm::Value *High) {
646 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
647 llvm::Value *K47 = Builder.getInt64(47);
648 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
649 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
650 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
651 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
652 return Builder.CreateMul(B1, KMul);
653}
654
655bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
656 return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
657 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
658}
659
660bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
661 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
662 return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
663 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
664 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
665 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
666}
667
668bool CodeGenFunction::sanitizePerformTypeCheck() const {
669 return SanOpts.has(SanitizerKind::Null) |
670 SanOpts.has(SanitizerKind::Alignment) |
671 SanOpts.has(SanitizerKind::ObjectSize) |
672 SanOpts.has(SanitizerKind::Vptr);
673}
674
675void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
676 llvm::Value *Ptr, QualType Ty,
677 CharUnits Alignment,
678 SanitizerSet SkippedChecks,
679 llvm::Value *ArraySize) {
680 if (!sanitizePerformTypeCheck())
681 return;
682
683 // Don't check pointers outside the default address space. The null check
684 // isn't correct, the object-size check isn't supported by LLVM, and we can't
685 // communicate the addresses to the runtime handler for the vptr check.
686 if (Ptr->getType()->getPointerAddressSpace())
687 return;
688
689 // Don't check pointers to volatile data. The behavior here is implementation-
690 // defined.
691 if (Ty.isVolatileQualified())
692 return;
693
694 SanitizerScope SanScope(this);
695
696 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
697 llvm::BasicBlock *Done = nullptr;
698
699 // Quickly determine whether we have a pointer to an alloca. It's possible
700 // to skip null checks, and some alignment checks, for these pointers. This
701 // can reduce compile-time significantly.
702 auto PtrToAlloca = dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCasts());
703
704 llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
705 llvm::Value *IsNonNull = nullptr;
706 bool IsGuaranteedNonNull =
707 SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
708 bool AllowNullPointers = isNullPointerAllowed(TCK);
709 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
710 !IsGuaranteedNonNull) {
711 // The glvalue must not be an empty glvalue.
712 IsNonNull = Builder.CreateIsNotNull(Ptr);
713
714 // The IR builder can constant-fold the null check if the pointer points to
715 // a constant.
716 IsGuaranteedNonNull = IsNonNull == True;
717
718 // Skip the null check if the pointer is known to be non-null.
719 if (!IsGuaranteedNonNull) {
720 if (AllowNullPointers) {
721 // When performing pointer casts, it's OK if the value is null.
722 // Skip the remaining checks in that case.
723 Done = createBasicBlock("null");
724 llvm::BasicBlock *Rest = createBasicBlock("not.null");
725 Builder.CreateCondBr(IsNonNull, Rest, Done);
726 EmitBlock(Rest);
727 } else {
728 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
729 }
730 }
731 }
732
733 if (SanOpts.has(SanitizerKind::ObjectSize) &&
734 !SkippedChecks.has(SanitizerKind::ObjectSize) &&
735 !Ty->isIncompleteType()) {
736 uint64_t TySize = CGM.getMinimumObjectSize(Ty).getQuantity();
737 llvm::Value *Size = llvm::ConstantInt::get(IntPtrTy, TySize);
738 if (ArraySize)
739 Size = Builder.CreateMul(Size, ArraySize);
740
741 // Degenerate case: new X[0] does not need an objectsize check.
742 llvm::Constant *ConstantSize = dyn_cast<llvm::Constant>(Size);
743 if (!ConstantSize || !ConstantSize->isNullValue()) {
744 // The glvalue must refer to a large enough storage region.
745 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
746 // to check this.
747 // FIXME: Get object address space
748 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
749 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
750 llvm::Value *Min = Builder.getFalse();
751 llvm::Value *NullIsUnknown = Builder.getFalse();
752 llvm::Value *Dynamic = Builder.getFalse();
753 llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
754 llvm::Value *LargeEnough = Builder.CreateICmpUGE(
755 Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown, Dynamic}), Size);
756 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
757 }
758 }
759
760 uint64_t AlignVal = 0;
761 llvm::Value *PtrAsInt = nullptr;
762
763 if (SanOpts.has(SanitizerKind::Alignment) &&
764 !SkippedChecks.has(SanitizerKind::Alignment)) {
765 AlignVal = Alignment.getQuantity();
766 if (!Ty->isIncompleteType() && !AlignVal)
767 AlignVal = CGM.getNaturalTypeAlignment(Ty, nullptr, nullptr,
768 /*ForPointeeType=*/true)
769 .getQuantity();
770
771 // The glvalue must be suitably aligned.
772 if (AlignVal > 1 &&
773 (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
774 PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
775 llvm::Value *Align = Builder.CreateAnd(
776 PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
777 llvm::Value *Aligned =
778 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
779 if (Aligned != True)
780 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
781 }
782 }
783
784 if (Checks.size() > 0) {
785 // Make sure we're not losing information. Alignment needs to be a power of
786 // 2
787 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 787, __PRETTY_FUNCTION__))
;
788 llvm::Constant *StaticData[] = {
789 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
790 llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
791 llvm::ConstantInt::get(Int8Ty, TCK)};
792 EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
793 PtrAsInt ? PtrAsInt : Ptr);
794 }
795
796 // If possible, check that the vptr indicates that there is a subobject of
797 // type Ty at offset zero within this object.
798 //
799 // C++11 [basic.life]p5,6:
800 // [For storage which does not refer to an object within its lifetime]
801 // The program has undefined behavior if:
802 // -- the [pointer or glvalue] is used to access a non-static data member
803 // or call a non-static member function
804 if (SanOpts.has(SanitizerKind::Vptr) &&
805 !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
806 // Ensure that the pointer is non-null before loading it. If there is no
807 // compile-time guarantee, reuse the run-time null check or emit a new one.
808 if (!IsGuaranteedNonNull) {
809 if (!IsNonNull)
810 IsNonNull = Builder.CreateIsNotNull(Ptr);
811 if (!Done)
812 Done = createBasicBlock("vptr.null");
813 llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
814 Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
815 EmitBlock(VptrNotNull);
816 }
817
818 // Compute a hash of the mangled name of the type.
819 //
820 // FIXME: This is not guaranteed to be deterministic! Move to a
821 // fingerprinting mechanism once LLVM provides one. For the time
822 // being the implementation happens to be deterministic.
823 SmallString<64> MangledName;
824 llvm::raw_svector_ostream Out(MangledName);
825 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
826 Out);
827
828 // Blacklist based on the mangled type.
829 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
830 SanitizerKind::Vptr, Out.str())) {
831 llvm::hash_code TypeHash = hash_value(Out.str());
832
833 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
834 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
835 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
836 Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
837 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
838 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
839
840 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
841 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
842
843 // Look the hash up in our cache.
844 const int CacheSize = 128;
845 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
846 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
847 "__ubsan_vptr_type_cache");
848 llvm::Value *Slot = Builder.CreateAnd(Hash,
849 llvm::ConstantInt::get(IntPtrTy,
850 CacheSize-1));
851 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
852 llvm::Value *CacheVal =
853 Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
854 getPointerAlign());
855
856 // If the hash isn't in the cache, call a runtime handler to perform the
857 // hard work of checking whether the vptr is for an object of the right
858 // type. This will either fill in the cache and return, or produce a
859 // diagnostic.
860 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
861 llvm::Constant *StaticData[] = {
862 EmitCheckSourceLocation(Loc),
863 EmitCheckTypeDescriptor(Ty),
864 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
865 llvm::ConstantInt::get(Int8Ty, TCK)
866 };
867 llvm::Value *DynamicData[] = { Ptr, Hash };
868 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
869 SanitizerHandler::DynamicTypeCacheMiss, StaticData,
870 DynamicData);
871 }
872 }
873
874 if (Done) {
875 Builder.CreateBr(Done);
876 EmitBlock(Done);
877 }
878}
879
880/// Determine whether this expression refers to a flexible array member in a
881/// struct. We disable array bounds checks for such members.
882static bool isFlexibleArrayMemberExpr(const Expr *E) {
883 // For compatibility with existing code, we treat arrays of length 0 or
884 // 1 as flexible array members.
885 // FIXME: This is inconsistent with the warning code in SemaChecking. Unify
886 // the two mechanisms.
887 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
888 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
889 // FIXME: Sema doesn't treat [1] as a flexible array member if the bound
890 // was produced by macro expansion.
891 if (CAT->getSize().ugt(1))
892 return false;
893 } else if (!isa<IncompleteArrayType>(AT))
894 return false;
895
896 E = E->IgnoreParens();
897
898 // A flexible array member must be the last member in the class.
899 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
900 // FIXME: If the base type of the member expr is not FD->getParent(),
901 // this should not be treated as a flexible array member access.
902 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
903 // FIXME: Sema doesn't treat a T[1] union member as a flexible array
904 // member, only a T[0] or T[] member gets that treatment.
905 if (FD->getParent()->isUnion())
906 return true;
907 RecordDecl::field_iterator FI(
908 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
909 return ++FI == FD->getParent()->field_end();
910 }
911 } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
912 return IRE->getDecl()->getNextIvar() == nullptr;
913 }
914
915 return false;
916}
917
918llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
919 QualType EltTy) {
920 ASTContext &C = getContext();
921 uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
922 if (!EltSize)
923 return nullptr;
924
925 auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
926 if (!ArrayDeclRef)
927 return nullptr;
928
929 auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
930 if (!ParamDecl)
931 return nullptr;
932
933 auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
934 if (!POSAttr)
935 return nullptr;
936
937 // Don't load the size if it's a lower bound.
938 int POSType = POSAttr->getType();
939 if (POSType != 0 && POSType != 1)
940 return nullptr;
941
942 // Find the implicit size parameter.
943 auto PassedSizeIt = SizeArguments.find(ParamDecl);
944 if (PassedSizeIt == SizeArguments.end())
945 return nullptr;
946
947 const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
948 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 948, __PRETTY_FUNCTION__))
;
949 Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
950 llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
951 C.getSizeType(), E->getExprLoc());
952 llvm::Value *SizeOfElement =
953 llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
954 return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
955}
956
957/// If Base is known to point to the start of an array, return the length of
958/// that array. Return 0 if the length cannot be determined.
959static llvm::Value *getArrayIndexingBound(
960 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
961 // For the vector indexing extension, the bound is the number of elements.
962 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
963 IndexedType = Base->getType();
964 return CGF.Builder.getInt32(VT->getNumElements());
965 }
966
967 Base = Base->IgnoreParens();
968
969 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
970 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
971 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
972 IndexedType = CE->getSubExpr()->getType();
973 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
974 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
975 return CGF.Builder.getInt(CAT->getSize());
976 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
977 return CGF.getVLASize(VAT).NumElts;
978 // Ignore pass_object_size here. It's not applicable on decayed pointers.
979 }
980 }
981
982 QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
983 if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
984 IndexedType = Base->getType();
985 return POS;
986 }
987
988 return nullptr;
989}
990
991void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
992 llvm::Value *Index, QualType IndexType,
993 bool Accessed) {
994 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 995, __PRETTY_FUNCTION__))
995 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 995, __PRETTY_FUNCTION__))
;
996 SanitizerScope SanScope(this);
997
998 QualType IndexedType;
999 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
1000 if (!Bound)
1001 return;
1002
1003 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
1004 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
1005 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
1006
1007 llvm::Constant *StaticData[] = {
1008 EmitCheckSourceLocation(E->getExprLoc()),
1009 EmitCheckTypeDescriptor(IndexedType),
1010 EmitCheckTypeDescriptor(IndexType)
1011 };
1012 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
1013 : Builder.CreateICmpULE(IndexVal, BoundVal);
1014 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
1015 SanitizerHandler::OutOfBounds, StaticData, Index);
1016}
1017
1018
1019CodeGenFunction::ComplexPairTy CodeGenFunction::
1020EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
1021 bool isInc, bool isPre) {
1022 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
1023
1024 llvm::Value *NextVal;
1025 if (isa<llvm::IntegerType>(InVal.first->getType())) {
1026 uint64_t AmountVal = isInc ? 1 : -1;
1027 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
1028
1029 // Add the inc/dec to the real part.
1030 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1031 } else {
1032 QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
1033 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
1034 if (!isInc)
1035 FVal.changeSign();
1036 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
1037
1038 // Add the inc/dec to the real part.
1039 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1040 }
1041
1042 ComplexPairTy IncVal(NextVal, InVal.second);
1043
1044 // Store the updated result through the lvalue.
1045 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
1046 if (getLangOpts().OpenMP)
1047 CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
1048 E->getSubExpr());
1049
1050 // If this is a postinc, return the value read from memory, otherwise use the
1051 // updated value.
1052 return isPre ? IncVal : InVal;
1053}
1054
1055void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
1056 CodeGenFunction *CGF) {
1057 // Bind VLAs in the cast type.
1058 if (CGF && E->getType()->isVariablyModifiedType())
1059 CGF->EmitVariablyModifiedType(E->getType());
1060
1061 if (CGDebugInfo *DI = getModuleDebugInfo())
1062 DI->EmitExplicitCastType(E->getType());
1063}
1064
1065//===----------------------------------------------------------------------===//
1066// LValue Expression Emission
1067//===----------------------------------------------------------------------===//
1068
1069/// EmitPointerWithAlignment - Given an expression of pointer type, try to
1070/// derive a more accurate bound on the alignment of the pointer.
1071Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
1072 LValueBaseInfo *BaseInfo,
1073 TBAAAccessInfo *TBAAInfo) {
1074 // We allow this with ObjC object pointers because of fragile ABIs.
1075 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1076, __PRETTY_FUNCTION__))
1076 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1076, __PRETTY_FUNCTION__))
;
1077 E = E->IgnoreParens();
1078
1079 // Casts:
1080 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
1081 if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
1082 CGM.EmitExplicitCastExprType(ECE, this);
1083
1084 switch (CE->getCastKind()) {
1085 // Non-converting casts (but not C's implicit conversion from void*).
1086 case CK_BitCast:
1087 case CK_NoOp:
1088 case CK_AddressSpaceConversion:
1089 if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
1090 if (PtrTy->getPointeeType()->isVoidType())
1091 break;
1092
1093 LValueBaseInfo InnerBaseInfo;
1094 TBAAAccessInfo InnerTBAAInfo;
1095 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
1096 &InnerBaseInfo,
1097 &InnerTBAAInfo);
1098 if (BaseInfo) *BaseInfo = InnerBaseInfo;
1099 if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
1100
1101 if (isa<ExplicitCastExpr>(CE)) {
1102 LValueBaseInfo TargetTypeBaseInfo;
1103 TBAAAccessInfo TargetTypeTBAAInfo;
1104 CharUnits Align = CGM.getNaturalPointeeTypeAlignment(
1105 E->getType(), &TargetTypeBaseInfo, &TargetTypeTBAAInfo);
1106 if (TBAAInfo)
1107 *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
1108 TargetTypeTBAAInfo);
1109 // If the source l-value is opaque, honor the alignment of the
1110 // casted-to type.
1111 if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
1112 if (BaseInfo)
1113 BaseInfo->mergeForCast(TargetTypeBaseInfo);
1114 Addr = Address(Addr.getPointer(), Align);
1115 }
1116 }
1117
1118 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
1119 CE->getCastKind() == CK_BitCast) {
1120 if (auto PT = E->getType()->getAs<PointerType>())
1121 EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
1122 /*MayBeNull=*/true,
1123 CodeGenFunction::CFITCK_UnrelatedCast,
1124 CE->getBeginLoc());
1125 }
1126 return CE->getCastKind() != CK_AddressSpaceConversion
1127 ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
1128 : Builder.CreateAddrSpaceCast(Addr,
1129 ConvertType(E->getType()));
1130 }
1131 break;
1132
1133 // Array-to-pointer decay.
1134 case CK_ArrayToPointerDecay:
1135 return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
1136
1137 // Derived-to-base conversions.
1138 case CK_UncheckedDerivedToBase:
1139 case CK_DerivedToBase: {
1140 // TODO: Support accesses to members of base classes in TBAA. For now, we
1141 // conservatively pretend that the complete object is of the base class
1142 // type.
1143 if (TBAAInfo)
1144 *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
1145 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
1146 auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
1147 return GetAddressOfBaseClass(Addr, Derived,
1148 CE->path_begin(), CE->path_end(),
1149 ShouldNullCheckClassCastValue(CE),
1150 CE->getExprLoc());
1151 }
1152
1153 // TODO: Is there any reason to treat base-to-derived conversions
1154 // specially?
1155 default:
1156 break;
1157 }
1158 }
1159
1160 // Unary &.
1161 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
1162 if (UO->getOpcode() == UO_AddrOf) {
1163 LValue LV = EmitLValue(UO->getSubExpr());
1164 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
1165 if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
1166 return LV.getAddress(*this);
1167 }
1168 }
1169
1170 // TODO: conditional operators, comma.
1171
1172 // Otherwise, use the alignment of the type.
1173 CharUnits Align =
1174 CGM.getNaturalPointeeTypeAlignment(E->getType(), BaseInfo, TBAAInfo);
1175 return Address(EmitScalarExpr(E), Align);
1176}
1177
1178RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
1179 if (Ty->isVoidType())
1180 return RValue::get(nullptr);
1181
1182 switch (getEvaluationKind(Ty)) {
1183 case TEK_Complex: {
1184 llvm::Type *EltTy =
1185 ConvertType(Ty->castAs<ComplexType>()->getElementType());
1186 llvm::Value *U = llvm::UndefValue::get(EltTy);
1187 return RValue::getComplex(std::make_pair(U, U));
1188 }
1189
1190 // If this is a use of an undefined aggregate type, the aggregate must have an
1191 // identifiable address. Just because the contents of the value are undefined
1192 // doesn't mean that the address can't be taken and compared.
1193 case TEK_Aggregate: {
1194 Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
1195 return RValue::getAggregate(DestPtr);
1196 }
1197
1198 case TEK_Scalar:
1199 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
1200 }
1201 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1201)
;
1202}
1203
1204RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
1205 const char *Name) {
1206 ErrorUnsupported(E, Name);
1207 return GetUndefRValue(E->getType());
1208}
1209
1210LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
1211 const char *Name) {
1212 ErrorUnsupported(E, Name);
1213 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
1214 return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
1215 E->getType());
1216}
1217
1218bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
1219 const Expr *Base = Obj;
1220 while (!isa<CXXThisExpr>(Base)) {
1221 // The result of a dynamic_cast can be null.
1222 if (isa<CXXDynamicCastExpr>(Base))
1223 return false;
1224
1225 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
1226 Base = CE->getSubExpr();
1227 } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
1228 Base = PE->getSubExpr();
1229 } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
1230 if (UO->getOpcode() == UO_Extension)
1231 Base = UO->getSubExpr();
1232 else
1233 return false;
1234 } else {
1235 return false;
1236 }
1237 }
1238 return true;
1239}
1240
1241LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
1242 LValue LV;
1243 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
1244 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
1245 else
1246 LV = EmitLValue(E);
1247 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
1248 SanitizerSet SkippedChecks;
1249 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
1250 bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
1251 if (IsBaseCXXThis)
1252 SkippedChecks.set(SanitizerKind::Alignment, true);
1253 if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
1254 SkippedChecks.set(SanitizerKind::Null, true);
1255 }
1256 EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(*this), E->getType(),
1257 LV.getAlignment(), SkippedChecks);
1258 }
1259 return LV;
1260}
1261
1262/// EmitLValue - Emit code to compute a designator that specifies the location
1263/// of the expression.
1264///
1265/// This can return one of two things: a simple address or a bitfield reference.
1266/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1267/// an LLVM pointer type.
1268///
1269/// If this returns a bitfield reference, nothing about the pointee type of the
1270/// LLVM value is known: For example, it may not be a pointer to an integer.
1271///
1272/// If this returns a normal address, and if the lvalue's C type is fixed size,
1273/// this method guarantees that the returned pointer type will point to an LLVM
1274/// type of the same size of the lvalue's type. If the lvalue has a variable
1275/// length type, this is not possible.
1276///
1277LValue CodeGenFunction::EmitLValue(const Expr *E) {
1278 ApplyDebugLocation DL(*this, E);
1279 switch (E->getStmtClass()) {
11
Control jumps to 'case SubstNonTypeTemplateParmExprClass:' at line 1401
14
Control jumps to 'case MatrixSubscriptExprClass:' at line 1383
1280 default: return EmitUnsupportedLValue(E, "l-value expression");
1281
1282 case Expr::ObjCPropertyRefExprClass:
1283 llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1283)
;
1284
1285 case Expr::ObjCSelectorExprClass:
1286 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
1287 case Expr::ObjCIsaExprClass:
1288 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
1289 case Expr::BinaryOperatorClass:
1290 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
1291 case Expr::CompoundAssignOperatorClass: {
1292 QualType Ty = E->getType();
1293 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1294 Ty = AT->getValueType();
1295 if (!Ty->isAnyComplexType())
1296 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1297 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1298 }
1299 case Expr::CallExprClass:
1300 case Expr::CXXMemberCallExprClass:
1301 case Expr::CXXOperatorCallExprClass:
1302 case Expr::UserDefinedLiteralClass:
1303 return EmitCallExprLValue(cast<CallExpr>(E));
1304 case Expr::CXXRewrittenBinaryOperatorClass:
1305 return EmitLValue(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm());
1306 case Expr::VAArgExprClass:
1307 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
1308 case Expr::DeclRefExprClass:
1309 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
1310 case Expr::ConstantExprClass: {
1311 const ConstantExpr *CE = cast<ConstantExpr>(E);
1312 if (llvm::Value *Result = ConstantEmitter(*this).tryEmitConstantExpr(CE)) {
1313 QualType RetType = cast<CallExpr>(CE->getSubExpr()->IgnoreImplicit())
1314 ->getCallReturnType(getContext());
1315 return MakeNaturalAlignAddrLValue(Result, RetType);
1316 }
1317 return EmitLValue(cast<ConstantExpr>(E)->getSubExpr());
1318 }
1319 case Expr::ParenExprClass:
1320 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
1321 case Expr::GenericSelectionExprClass:
1322 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
1323 case Expr::PredefinedExprClass:
1324 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
1325 case Expr::StringLiteralClass:
1326 return EmitStringLiteralLValue(cast<StringLiteral>(E));
1327 case Expr::ObjCEncodeExprClass:
1328 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
1329 case Expr::PseudoObjectExprClass:
1330 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
1331 case Expr::InitListExprClass:
1332 return EmitInitListLValue(cast<InitListExpr>(E));
1333 case Expr::CXXTemporaryObjectExprClass:
1334 case Expr::CXXConstructExprClass:
1335 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
1336 case Expr::CXXBindTemporaryExprClass:
1337 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
1338 case Expr::CXXUuidofExprClass:
1339 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
1340 case Expr::LambdaExprClass:
1341 return EmitAggExprToLValue(E);
1342
1343 case Expr::ExprWithCleanupsClass: {
1344 const auto *cleanups = cast<ExprWithCleanups>(E);
1345 RunCleanupsScope Scope(*this);
1346 LValue LV = EmitLValue(cleanups->getSubExpr());
1347 if (LV.isSimple()) {
1348 // Defend against branches out of gnu statement expressions surrounded by
1349 // cleanups.
1350 llvm::Value *V = LV.getPointer(*this);
1351 Scope.ForceCleanup({&V});
1352 return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
1353 getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
1354 }
1355 // FIXME: Is it possible to create an ExprWithCleanups that produces a
1356 // bitfield lvalue or some other non-simple lvalue?
1357 return LV;
1358 }
1359
1360 case Expr::CXXDefaultArgExprClass: {
1361 auto *DAE = cast<CXXDefaultArgExpr>(E);
1362 CXXDefaultArgExprScope Scope(*this, DAE);
1363 return EmitLValue(DAE->getExpr());
1364 }
1365 case Expr::CXXDefaultInitExprClass: {
1366 auto *DIE = cast<CXXDefaultInitExpr>(E);
1367 CXXDefaultInitExprScope Scope(*this, DIE);
1368 return EmitLValue(DIE->getExpr());
1369 }
1370 case Expr::CXXTypeidExprClass:
1371 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
1372
1373 case Expr::ObjCMessageExprClass:
1374 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
1375 case Expr::ObjCIvarRefExprClass:
1376 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
1377 case Expr::StmtExprClass:
1378 return EmitStmtExprLValue(cast<StmtExpr>(E));
1379 case Expr::UnaryOperatorClass:
1380 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
1381 case Expr::ArraySubscriptExprClass:
1382 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
1383 case Expr::MatrixSubscriptExprClass:
1384 return EmitMatrixSubscriptExpr(cast<MatrixSubscriptExpr>(E));
15
'E' is a 'MatrixSubscriptExpr'
16
Calling 'CodeGenFunction::EmitMatrixSubscriptExpr'
1385 case Expr::OMPArraySectionExprClass:
1386 return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
1387 case Expr::ExtVectorElementExprClass:
1388 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
1389 case Expr::MemberExprClass:
1390 return EmitMemberExpr(cast<MemberExpr>(E));
1391 case Expr::CompoundLiteralExprClass:
1392 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
1393 case Expr::ConditionalOperatorClass:
1394 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
1395 case Expr::BinaryConditionalOperatorClass:
1396 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
1397 case Expr::ChooseExprClass:
1398 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
1399 case Expr::OpaqueValueExprClass:
1400 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
1401 case Expr::SubstNonTypeTemplateParmExprClass:
1402 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
12
'E' is a 'SubstNonTypeTemplateParmExpr'
13
Calling 'CodeGenFunction::EmitLValue'
1403 case Expr::ImplicitCastExprClass:
1404 case Expr::CStyleCastExprClass:
1405 case Expr::CXXFunctionalCastExprClass:
1406 case Expr::CXXStaticCastExprClass:
1407 case Expr::CXXDynamicCastExprClass:
1408 case Expr::CXXReinterpretCastExprClass:
1409 case Expr::CXXConstCastExprClass:
1410 case Expr::CXXAddrspaceCastExprClass:
1411 case Expr::ObjCBridgedCastExprClass:
1412 return EmitCastLValue(cast<CastExpr>(E));
1413
1414 case Expr::MaterializeTemporaryExprClass:
1415 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
1416
1417 case Expr::CoawaitExprClass:
1418 return EmitCoawaitLValue(cast<CoawaitExpr>(E));
1419 case Expr::CoyieldExprClass:
1420 return EmitCoyieldLValue(cast<CoyieldExpr>(E));
1421 }
1422}
1423
1424/// Given an object of the given canonical type, can we safely copy a
1425/// value out of it based on its initializer?
1426static bool isConstantEmittableObjectType(QualType type) {
1427 assert(type.isCanonical())((type.isCanonical()) ? static_cast<void> (0) : __assert_fail
("type.isCanonical()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1427, __PRETTY_FUNCTION__))
;
1428 assert(!type->isReferenceType())((!type->isReferenceType()) ? static_cast<void> (0) :
__assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1428, __PRETTY_FUNCTION__))
;
1429
1430 // Must be const-qualified but non-volatile.
1431 Qualifiers qs = type.getLocalQualifiers();
1432 if (!qs.hasConst() || qs.hasVolatile()) return false;
1433
1434 // Otherwise, all object types satisfy this except C++ classes with
1435 // mutable subobjects or non-trivial copy/destroy behavior.
1436 if (const auto *RT = dyn_cast<RecordType>(type))
1437 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1438 if (RD->hasMutableFields() || !RD->isTrivial())
1439 return false;
1440
1441 return true;
1442}
1443
1444/// Can we constant-emit a load of a reference to a variable of the
1445/// given type? This is different from predicates like
1446/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
1447/// in situations that don't necessarily satisfy the language's rules
1448/// for this (e.g. C++'s ODR-use rules). For example, we want to able
1449/// to do this with const float variables even if those variables
1450/// aren't marked 'constexpr'.
1451enum ConstantEmissionKind {
1452 CEK_None,
1453 CEK_AsReferenceOnly,
1454 CEK_AsValueOrReference,
1455 CEK_AsValueOnly
1456};
1457static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
1458 type = type.getCanonicalType();
1459 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
1460 if (isConstantEmittableObjectType(ref->getPointeeType()))
1461 return CEK_AsValueOrReference;
1462 return CEK_AsReferenceOnly;
1463 }
1464 if (isConstantEmittableObjectType(type))
1465 return CEK_AsValueOnly;
1466 return CEK_None;
1467}
1468
1469/// Try to emit a reference to the given value without producing it as
1470/// an l-value. This is just an optimization, but it avoids us needing
1471/// to emit global copies of variables if they're named without triggering
1472/// a formal use in a context where we can't emit a direct reference to them,
1473/// for instance if a block or lambda or a member of a local class uses a
1474/// const int variable or constexpr variable from an enclosing function.
1475CodeGenFunction::ConstantEmission
1476CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1477 ValueDecl *value = refExpr->getDecl();
1478
1479 // The value needs to be an enum constant or a constant variable.
1480 ConstantEmissionKind CEK;
1481 if (isa<ParmVarDecl>(value)) {
1482 CEK = CEK_None;
1483 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1484 CEK = checkVarTypeForConstantEmission(var->getType());
1485 } else if (isa<EnumConstantDecl>(value)) {
1486 CEK = CEK_AsValueOnly;
1487 } else {
1488 CEK = CEK_None;
1489 }
1490 if (CEK == CEK_None) return ConstantEmission();
1491
1492 Expr::EvalResult result;
1493 bool resultIsReference;
1494 QualType resultType;
1495
1496 // It's best to evaluate all the way as an r-value if that's permitted.
1497 if (CEK != CEK_AsReferenceOnly &&
1498 refExpr->EvaluateAsRValue(result, getContext())) {
1499 resultIsReference = false;
1500 resultType = refExpr->getType();
1501
1502 // Otherwise, try to evaluate as an l-value.
1503 } else if (CEK != CEK_AsValueOnly &&
1504 refExpr->EvaluateAsLValue(result, getContext())) {
1505 resultIsReference = true;
1506 resultType = value->getType();
1507
1508 // Failure.
1509 } else {
1510 return ConstantEmission();
1511 }
1512
1513 // In any case, if the initializer has side-effects, abandon ship.
1514 if (result.HasSideEffects)
1515 return ConstantEmission();
1516
1517 // Emit as a constant.
1518 auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
1519 result.Val, resultType);
1520
1521 // Make sure we emit a debug reference to the global variable.
1522 // This should probably fire even for
1523 if (isa<VarDecl>(value)) {
1524 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1525 EmitDeclRefExprDbgValue(refExpr, result.Val);
1526 } else {
1527 assert(isa<EnumConstantDecl>(value))((isa<EnumConstantDecl>(value)) ? static_cast<void>
(0) : __assert_fail ("isa<EnumConstantDecl>(value)", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1527, __PRETTY_FUNCTION__))
;
1528 EmitDeclRefExprDbgValue(refExpr, result.Val);
1529 }
1530
1531 // If we emitted a reference constant, we need to dereference that.
1532 if (resultIsReference)
1533 return ConstantEmission::forReference(C);
1534
1535 return ConstantEmission::forValue(C);
1536}
1537
1538static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
1539 const MemberExpr *ME) {
1540 if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
1541 // Try to emit static variable member expressions as DREs.
1542 return DeclRefExpr::Create(
1543 CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
1544 /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
1545 ME->getType(), ME->getValueKind(), nullptr, nullptr, ME->isNonOdrUse());
1546 }
1547 return nullptr;
1548}
1549
1550CodeGenFunction::ConstantEmission
1551CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
1552 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
1553 return tryEmitAsConstant(DRE);
1554 return ConstantEmission();
1555}
1556
1557llvm::Value *CodeGenFunction::emitScalarConstant(
1558 const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
1559 assert(Constant && "not a constant")((Constant && "not a constant") ? static_cast<void
> (0) : __assert_fail ("Constant && \"not a constant\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1559, __PRETTY_FUNCTION__))
;
1560 if (Constant.isReference())
1561 return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
1562 E->getExprLoc())
1563 .getScalarVal();
1564 return Constant.getValue();
1565}
1566
1567llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1568 SourceLocation Loc) {
1569 return EmitLoadOfScalar(lvalue.getAddress(*this), lvalue.isVolatile(),
1570 lvalue.getType(), Loc, lvalue.getBaseInfo(),
1571 lvalue.getTBAAInfo(), lvalue.isNontemporal());
1572}
1573
1574static bool hasBooleanRepresentation(QualType Ty) {
1575 if (Ty->isBooleanType())
1576 return true;
1577
1578 if (const EnumType *ET = Ty->getAs<EnumType>())
1579 return ET->getDecl()->getIntegerType()->isBooleanType();
1580
1581 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1582 return hasBooleanRepresentation(AT->getValueType());
1583
1584 return false;
1585}
1586
1587static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1588 llvm::APInt &Min, llvm::APInt &End,
1589 bool StrictEnums, bool IsBool) {
1590 const EnumType *ET = Ty->getAs<EnumType>();
1591 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1592 ET && !ET->getDecl()->isFixed();
1593 if (!IsBool && !IsRegularCPlusPlusEnum)
1594 return false;
1595
1596 if (IsBool) {
1597 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1598 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1599 } else {
1600 const EnumDecl *ED = ET->getDecl();
1601 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1602 unsigned Bitwidth = LTy->getScalarSizeInBits();
1603 unsigned NumNegativeBits = ED->getNumNegativeBits();
1604 unsigned NumPositiveBits = ED->getNumPositiveBits();
1605
1606 if (NumNegativeBits) {
1607 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1608 assert(NumBits <= Bitwidth)((NumBits <= Bitwidth) ? static_cast<void> (0) : __assert_fail
("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1608, __PRETTY_FUNCTION__))
;
1609 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1610 Min = -End;
1611 } else {
1612 assert(NumPositiveBits <= Bitwidth)((NumPositiveBits <= Bitwidth) ? static_cast<void> (
0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1612, __PRETTY_FUNCTION__))
;
1613 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1614 Min = llvm::APInt(Bitwidth, 0);
1615 }
1616 }
1617 return true;
1618}
1619
1620llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1621 llvm::APInt Min, End;
1622 if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
1623 hasBooleanRepresentation(Ty)))
1624 return nullptr;
1625
1626 llvm::MDBuilder MDHelper(getLLVMContext());
1627 return MDHelper.createRange(Min, End);
1628}
1629
1630bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
1631 SourceLocation Loc) {
1632 bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
1633 bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
1634 if (!HasBoolCheck && !HasEnumCheck)
1635 return false;
1636
1637 bool IsBool = hasBooleanRepresentation(Ty) ||
1638 NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
1639 bool NeedsBoolCheck = HasBoolCheck && IsBool;
1640 bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
1641 if (!NeedsBoolCheck && !NeedsEnumCheck)
1642 return false;
1643
1644 // Single-bit booleans don't need to be checked. Special-case this to avoid
1645 // a bit width mismatch when handling bitfield values. This is handled by
1646 // EmitFromMemory for the non-bitfield case.
1647 if (IsBool &&
1648 cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
1649 return false;
1650
1651 llvm::APInt Min, End;
1652 if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
1653 return true;
1654
1655 auto &Ctx = getLLVMContext();
1656 SanitizerScope SanScope(this);
1657 llvm::Value *Check;
1658 --End;
1659 if (!Min) {
1660 Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
1661 } else {
1662 llvm::Value *Upper =
1663 Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
1664 llvm::Value *Lower =
1665 Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
1666 Check = Builder.CreateAnd(Upper, Lower);
1667 }
1668 llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
1669 EmitCheckTypeDescriptor(Ty)};
1670 SanitizerMask Kind =
1671 NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1672 EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
1673 StaticArgs, EmitCheckValue(Value));
1674 return true;
1675}
1676
1677llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
1678 QualType Ty,
1679 SourceLocation Loc,
1680 LValueBaseInfo BaseInfo,
1681 TBAAAccessInfo TBAAInfo,
1682 bool isNontemporal) {
1683 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1684 // For better performance, handle vector loads differently.
1685 if (Ty->isVectorType()) {
1686 const llvm::Type *EltTy = Addr.getElementType();
1687
1688 const auto *VTy = cast<llvm::FixedVectorType>(EltTy);
1689
1690 // Handle vectors of size 3 like size 4 for better performance.
1691 if (VTy->getNumElements() == 3) {
1692
1693 // Bitcast to vec4 type.
1694 auto *vec4Ty = llvm::FixedVectorType::get(VTy->getElementType(), 4);
1695 Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
1696 // Now load value.
1697 llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1698
1699 // Shuffle vector to get vec3.
1700 V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
1701 ArrayRef<int>{0, 1, 2}, "extractVec");
1702 return EmitFromMemory(V, Ty);
1703 }
1704 }
1705 }
1706
1707 // Atomic operations have to be done on integral types.
1708 LValue AtomicLValue =
1709 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1710 if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
1711 return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
1712 }
1713
1714 llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
1715 if (isNontemporal) {
1716 llvm::MDNode *Node = llvm::MDNode::get(
1717 Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1718 Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1719 }
1720
1721 CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
1722
1723 if (EmitScalarRangeCheck(Load, Ty, Loc)) {
1724 // In order to prevent the optimizer from throwing away the check, don't
1725 // attach range metadata to the load.
1726 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1727 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1728 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1729
1730 return EmitFromMemory(Load, Ty);
1731}
1732
1733llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1734 // Bool has a different representation in memory than in registers.
1735 if (hasBooleanRepresentation(Ty)) {
1736 // This should really always be an i1, but sometimes it's already
1737 // an i8, and it's awkward to track those cases down.
1738 if (Value->getType()->isIntegerTy(1))
1739 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1740 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1741, __PRETTY_FUNCTION__))
1741 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1741, __PRETTY_FUNCTION__))
;
1742 }
1743
1744 return Value;
1745}
1746
1747llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1748 // Bool has a different representation in memory than in registers.
1749 if (hasBooleanRepresentation(Ty)) {
1750 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1751, __PRETTY_FUNCTION__))
1751 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1751, __PRETTY_FUNCTION__))
;
1752 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1753 }
1754
1755 return Value;
1756}
1757
1758// Convert the pointer of \p Addr to a pointer to a vector (the value type of
1759// MatrixType), if it points to a array (the memory type of MatrixType).
1760static Address MaybeConvertMatrixAddress(Address Addr, CodeGenFunction &CGF,
1761 bool IsVector = true) {
1762 auto *ArrayTy = dyn_cast<llvm::ArrayType>(
1763 cast<llvm::PointerType>(Addr.getPointer()->getType())->getElementType());
1764 if (ArrayTy && IsVector) {
1765 auto *VectorTy = llvm::FixedVectorType::get(ArrayTy->getElementType(),
1766 ArrayTy->getNumElements());
1767
1768 return Address(CGF.Builder.CreateElementBitCast(Addr, VectorTy));
1769 }
1770 auto *VectorTy = dyn_cast<llvm::VectorType>(
1771 cast<llvm::PointerType>(Addr.getPointer()->getType())->getElementType());
1772 if (VectorTy && !IsVector) {
1773 auto *ArrayTy = llvm::ArrayType::get(
1774 VectorTy->getElementType(),
1775 cast<llvm::FixedVectorType>(VectorTy)->getNumElements());
1776
1777 return Address(CGF.Builder.CreateElementBitCast(Addr, ArrayTy));
1778 }
1779
1780 return Addr;
1781}
1782
1783// Emit a store of a matrix LValue. This may require casting the original
1784// pointer to memory address (ArrayType) to a pointer to the value type
1785// (VectorType).
1786static void EmitStoreOfMatrixScalar(llvm::Value *value, LValue lvalue,
1787 bool isInit, CodeGenFunction &CGF) {
1788 Address Addr = MaybeConvertMatrixAddress(lvalue.getAddress(CGF), CGF,
1789 value->getType()->isVectorTy());
1790 CGF.EmitStoreOfScalar(value, Addr, lvalue.isVolatile(), lvalue.getType(),
1791 lvalue.getBaseInfo(), lvalue.getTBAAInfo(), isInit,
1792 lvalue.isNontemporal());
1793}
1794
1795void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
1796 bool Volatile, QualType Ty,
1797 LValueBaseInfo BaseInfo,
1798 TBAAAccessInfo TBAAInfo,
1799 bool isInit, bool isNontemporal) {
1800 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1801 // Handle vectors differently to get better performance.
1802 if (Ty->isVectorType()) {
1803 llvm::Type *SrcTy = Value->getType();
1804 auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
1805 // Handle vec3 special.
1806 if (VecTy && cast<llvm::FixedVectorType>(VecTy)->getNumElements() == 3) {
1807 // Our source is a vec3, do a shuffle vector to make it a vec4.
1808 Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
1809 ArrayRef<int>{0, 1, 2, -1},
1810 "extractVec");
1811 SrcTy = llvm::FixedVectorType::get(VecTy->getElementType(), 4);
1812 }
1813 if (Addr.getElementType() != SrcTy) {
1814 Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
1815 }
1816 }
1817 }
1818
1819 Value = EmitToMemory(Value, Ty);
1820
1821 LValue AtomicLValue =
1822 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1823 if (Ty->isAtomicType() ||
1824 (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
1825 EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
1826 return;
1827 }
1828
1829 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1830 if (isNontemporal) {
1831 llvm::MDNode *Node =
1832 llvm::MDNode::get(Store->getContext(),
1833 llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1834 Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1835 }
1836
1837 CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
1838}
1839
1840void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1841 bool isInit) {
1842 if (lvalue.getType()->isConstantMatrixType()) {
1843 EmitStoreOfMatrixScalar(value, lvalue, isInit, *this);
1844 return;
1845 }
1846
1847 EmitStoreOfScalar(value, lvalue.getAddress(*this), lvalue.isVolatile(),
1848 lvalue.getType(), lvalue.getBaseInfo(),
1849 lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1850}
1851
1852// Emit a load of a LValue of matrix type. This may require casting the pointer
1853// to memory address (ArrayType) to a pointer to the value type (VectorType).
1854static RValue EmitLoadOfMatrixLValue(LValue LV, SourceLocation Loc,
1855 CodeGenFunction &CGF) {
1856 assert(LV.getType()->isConstantMatrixType())((LV.getType()->isConstantMatrixType()) ? static_cast<void
> (0) : __assert_fail ("LV.getType()->isConstantMatrixType()"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1856, __PRETTY_FUNCTION__))
;
1857 Address Addr = MaybeConvertMatrixAddress(LV.getAddress(CGF), CGF);
1858 LV.setAddress(Addr);
1859 return RValue::get(CGF.EmitLoadOfScalar(LV, Loc));
1860}
1861
1862/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1863/// method emits the address of the lvalue, then loads the result as an rvalue,
1864/// returning the rvalue.
1865RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1866 if (LV.isObjCWeak()) {
1867 // load of a __weak object.
1868 Address AddrWeakObj = LV.getAddress(*this);
1869 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1870 AddrWeakObj));
1871 }
1872 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1873 // In MRC mode, we do a load+autorelease.
1874 if (!getLangOpts().ObjCAutoRefCount) {
1875 return RValue::get(EmitARCLoadWeak(LV.getAddress(*this)));
1876 }
1877
1878 // In ARC mode, we load retained and then consume the value.
1879 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress(*this));
1880 Object = EmitObjCConsumeObject(LV.getType(), Object);
1881 return RValue::get(Object);
1882 }
1883
1884 if (LV.isSimple()) {
1885 assert(!LV.getType()->isFunctionType())((!LV.getType()->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("!LV.getType()->isFunctionType()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1885, __PRETTY_FUNCTION__))
;
1886
1887 if (LV.getType()->isConstantMatrixType())
1888 return EmitLoadOfMatrixLValue(LV, Loc, *this);
1889
1890 // Everything needs a load.
1891 return RValue::get(EmitLoadOfScalar(LV, Loc));
1892 }
1893
1894 if (LV.isVectorElt()) {
1895 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
1896 LV.isVolatileQualified());
1897 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1898 "vecext"));
1899 }
1900
1901 // If this is a reference to a subset of the elements of a vector, either
1902 // shuffle the input or extract/insert them as appropriate.
1903 if (LV.isExtVectorElt()) {
1904 return EmitLoadOfExtVectorElementLValue(LV);
1905 }
1906
1907 // Global Register variables always invoke intrinsics
1908 if (LV.isGlobalReg())
1909 return EmitLoadOfGlobalRegLValue(LV);
1910
1911 if (LV.isMatrixElt()) {
1912 llvm::LoadInst *Load =
1913 Builder.CreateLoad(LV.getMatrixAddress(), LV.isVolatileQualified());
1914 return RValue::get(
1915 Builder.CreateExtractElement(Load, LV.getMatrixIdx(), "matrixext"));
1916 }
1917
1918 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1918, __PRETTY_FUNCTION__))
;
1919 return EmitLoadOfBitfieldLValue(LV, Loc);
1920}
1921
1922RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
1923 SourceLocation Loc) {
1924 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1925
1926 // Get the output type.
1927 llvm::Type *ResLTy = ConvertType(LV.getType());
1928
1929 Address Ptr = LV.getBitFieldAddress();
1930 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
1931
1932 if (Info.IsSigned) {
1933 assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize)((static_cast<unsigned>(Info.Offset + Info.Size) <= Info
.StorageSize) ? static_cast<void> (0) : __assert_fail (
"static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 1933, __PRETTY_FUNCTION__))
;
1934 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1935 if (HighBits)
1936 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1937 if (Info.Offset + HighBits)
1938 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1939 } else {
1940 if (Info.Offset)
1941 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1942 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1943 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1944 Info.Size),
1945 "bf.clear");
1946 }
1947 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1948 EmitScalarRangeCheck(Val, LV.getType(), Loc);
1949 return RValue::get(Val);
1950}
1951
1952// If this is a reference to a subset of the elements of a vector, create an
1953// appropriate shufflevector.
1954RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1955 llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
1956 LV.isVolatileQualified());
1957
1958 const llvm::Constant *Elts = LV.getExtVectorElts();
1959
1960 // If the result of the expression is a non-vector type, we must be extracting
1961 // a single element. Just codegen as an extractelement.
1962 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1963 if (!ExprVT) {
1964 unsigned InIdx = getAccessedFieldNo(0, Elts);
1965 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1966 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1967 }
1968
1969 // Always use shuffle vector to try to retain the original program structure
1970 unsigned NumResultElts = ExprVT->getNumElements();
1971
1972 SmallVector<int, 4> Mask;
1973 for (unsigned i = 0; i != NumResultElts; ++i)
1974 Mask.push_back(getAccessedFieldNo(i, Elts));
1975
1976 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1977 Mask);
1978 return RValue::get(Vec);
1979}
1980
1981/// Generates lvalue for partial ext_vector access.
1982Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1983 Address VectorAddress = LV.getExtVectorAddress();
1984 QualType EQT = LV.getType()->castAs<VectorType>()->getElementType();
1985 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1986
1987 Address CastToPointerElement =
1988 Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
1989 "conv.ptr.element");
1990
1991 const llvm::Constant *Elts = LV.getExtVectorElts();
1992 unsigned ix = getAccessedFieldNo(0, Elts);
1993
1994 Address VectorBasePtrPlusIx =
1995 Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
1996 "vector.elt");
1997
1998 return VectorBasePtrPlusIx;
1999}
2000
2001/// Load of global gamed gegisters are always calls to intrinsics.
2002RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
2003 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2004, __PRETTY_FUNCTION__))
2004 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2004, __PRETTY_FUNCTION__))
;
2005 llvm::MDNode *RegName = cast<llvm::MDNode>(
2006 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
2007
2008 // We accept integer and pointer types only
2009 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
2010 llvm::Type *Ty = OrigTy;
2011 if (OrigTy->isPointerTy())
2012 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2013 llvm::Type *Types[] = { Ty };
2014
2015 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
2016 llvm::Value *Call = Builder.CreateCall(
2017 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
2018 if (OrigTy->isPointerTy())
2019 Call = Builder.CreateIntToPtr(Call, OrigTy);
2020 return RValue::get(Call);
2021}
2022
2023/// EmitStoreThroughLValue - Store the specified rvalue into the specified
2024/// lvalue, where both are guaranteed to the have the same type, and that type
2025/// is 'Ty'.
2026void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
2027 bool isInit) {
2028 if (!Dst.isSimple()) {
2029 if (Dst.isVectorElt()) {
2030 // Read/modify/write the vector, inserting the new element.
2031 llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
2032 Dst.isVolatileQualified());
2033 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
2034 Dst.getVectorIdx(), "vecins");
2035 Builder.CreateStore(Vec, Dst.getVectorAddress(),
2036 Dst.isVolatileQualified());
2037 return;
2038 }
2039
2040 // If this is an update of extended vector elements, insert them as
2041 // appropriate.
2042 if (Dst.isExtVectorElt())
2043 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
2044
2045 if (Dst.isGlobalReg())
2046 return EmitStoreThroughGlobalRegLValue(Src, Dst);
2047
2048 if (Dst.isMatrixElt()) {
2049 llvm::Value *Vec = Builder.CreateLoad(Dst.getMatrixAddress());
2050 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
2051 Dst.getMatrixIdx(), "matins");
2052 Builder.CreateStore(Vec, Dst.getMatrixAddress(),
2053 Dst.isVolatileQualified());
2054 return;
2055 }
2056
2057 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2057, __PRETTY_FUNCTION__))
;
2058 return EmitStoreThroughBitfieldLValue(Src, Dst);
2059 }
2060
2061 // There's special magic for assigning into an ARC-qualified l-value.
2062 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
2063 switch (Lifetime) {
2064 case Qualifiers::OCL_None:
2065 llvm_unreachable("present but none")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2065)
;
2066
2067 case Qualifiers::OCL_ExplicitNone:
2068 // nothing special
2069 break;
2070
2071 case Qualifiers::OCL_Strong:
2072 if (isInit) {
2073 Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
2074 break;
2075 }
2076 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
2077 return;
2078
2079 case Qualifiers::OCL_Weak:
2080 if (isInit)
2081 // Initialize and then skip the primitive store.
2082 EmitARCInitWeak(Dst.getAddress(*this), Src.getScalarVal());
2083 else
2084 EmitARCStoreWeak(Dst.getAddress(*this), Src.getScalarVal(),
2085 /*ignore*/ true);
2086 return;
2087
2088 case Qualifiers::OCL_Autoreleasing:
2089 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
2090 Src.getScalarVal()));
2091 // fall into the normal path
2092 break;
2093 }
2094 }
2095
2096 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
2097 // load of a __weak object.
2098 Address LvalueDst = Dst.getAddress(*this);
2099 llvm::Value *src = Src.getScalarVal();
2100 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
2101 return;
2102 }
2103
2104 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
2105 // load of a __strong object.
2106 Address LvalueDst = Dst.getAddress(*this);
2107 llvm::Value *src = Src.getScalarVal();
2108 if (Dst.isObjCIvar()) {
2109 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2109, __PRETTY_FUNCTION__))
;
2110 llvm::Type *ResultType = IntPtrTy;
2111 Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
2112 llvm::Value *RHS = dst.getPointer();
2113 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
2114 llvm::Value *LHS =
2115 Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
2116 "sub.ptr.lhs.cast");
2117 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
2118 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
2119 BytesBetween);
2120 } else if (Dst.isGlobalObjCRef()) {
2121 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
2122 Dst.isThreadLocalRef());
2123 }
2124 else
2125 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
2126 return;
2127 }
2128
2129 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2129, __PRETTY_FUNCTION__))
;
2130 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
2131}
2132
2133void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
2134 llvm::Value **Result) {
2135 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
2136 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
2137 Address Ptr = Dst.getBitFieldAddress();
2138
2139 // Get the source value, truncated to the width of the bit-field.
2140 llvm::Value *SrcVal = Src.getScalarVal();
2141
2142 // Cast the source to the storage type and shift it into place.
2143 SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
2144 /*isSigned=*/false);
2145 llvm::Value *MaskedVal = SrcVal;
2146
2147 // See if there are other bits in the bitfield's storage we'll need to load
2148 // and mask together with source before storing.
2149 if (Info.StorageSize != Info.Size) {
2150 assert(Info.StorageSize > Info.Size && "Invalid bitfield size.")((Info.StorageSize > Info.Size && "Invalid bitfield size."
) ? static_cast<void> (0) : __assert_fail ("Info.StorageSize > Info.Size && \"Invalid bitfield size.\""
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2150, __PRETTY_FUNCTION__))
;
2151 llvm::Value *Val =
2152 Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
2153
2154 // Mask the source value as needed.
2155 if (!hasBooleanRepresentation(Dst.getType()))
2156 SrcVal = Builder.CreateAnd(SrcVal,
2157 llvm::APInt::getLowBitsSet(Info.StorageSize,
2158 Info.Size),
2159 "bf.value");
2160 MaskedVal = SrcVal;
2161 if (Info.Offset)
2162 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
2163
2164 // Mask out the original value.
2165 Val = Builder.CreateAnd(Val,
2166 ~llvm::APInt::getBitsSet(Info.StorageSize,
2167 Info.Offset,
2168 Info.Offset + Info.Size),
2169 "bf.clear");
2170
2171 // Or together the unchanged values and the source value.
2172 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
2173 } else {
2174 assert(Info.Offset == 0)((Info.Offset == 0) ? static_cast<void> (0) : __assert_fail
("Info.Offset == 0", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2174, __PRETTY_FUNCTION__))
;
2175 // According to the AACPS:
2176 // When a volatile bit-field is written, and its container does not overlap
2177 // with any non-bit-field member, its container must be read exactly once and
2178 // written exactly once using the access width appropriate to the type of the
2179 // container. The two accesses are not atomic.
2180 if (Dst.isVolatileQualified() && isAAPCS(CGM.getTarget()) &&
2181 CGM.getCodeGenOpts().ForceAAPCSBitfieldLoad)
2182 Builder.CreateLoad(Ptr, true, "bf.load");
2183 }
2184
2185 // Write the new value back out.
2186 Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
2187
2188 // Return the new value of the bit-field, if requested.
2189 if (Result) {
2190 llvm::Value *ResultVal = MaskedVal;
2191
2192 // Sign extend the value if needed.
2193 if (Info.IsSigned) {
2194 assert(Info.Size <= Info.StorageSize)((Info.Size <= Info.StorageSize) ? static_cast<void>
(0) : __assert_fail ("Info.Size <= Info.StorageSize", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2194, __PRETTY_FUNCTION__))
;
2195 unsigned HighBits = Info.StorageSize - Info.Size;
2196 if (HighBits) {
2197 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
2198 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
2199 }
2200 }
2201
2202 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
2203 "bf.result.cast");
2204 *Result = EmitFromMemory(ResultVal, Dst.getType());
2205 }
2206}
2207
2208void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
2209 LValue Dst) {
2210 // This access turns into a read/modify/write of the vector. Load the input
2211 // value now.
2212 llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
2213 Dst.isVolatileQualified());
2214 const llvm::Constant *Elts = Dst.getExtVectorElts();
2215
2216 llvm::Value *SrcVal = Src.getScalarVal();
2217
2218 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
2219 unsigned NumSrcElts = VTy->getNumElements();
2220 unsigned NumDstElts =
2221 cast<llvm::FixedVectorType>(Vec->getType())->getNumElements();
2222 if (NumDstElts == NumSrcElts) {
2223 // Use shuffle vector is the src and destination are the same number of
2224 // elements and restore the vector mask since it is on the side it will be
2225 // stored.
2226 SmallVector<int, 4> Mask(NumDstElts);
2227 for (unsigned i = 0; i != NumSrcElts; ++i)
2228 Mask[getAccessedFieldNo(i, Elts)] = i;
2229
2230 Vec = Builder.CreateShuffleVector(
2231 SrcVal, llvm::UndefValue::get(Vec->getType()), Mask);
2232 } else if (NumDstElts > NumSrcElts) {
2233 // Extended the source vector to the same length and then shuffle it
2234 // into the destination.
2235 // FIXME: since we're shuffling with undef, can we just use the indices
2236 // into that? This could be simpler.
2237 SmallVector<int, 4> ExtMask;
2238 for (unsigned i = 0; i != NumSrcElts; ++i)
2239 ExtMask.push_back(i);
2240 ExtMask.resize(NumDstElts, -1);
2241 llvm::Value *ExtSrcVal = Builder.CreateShuffleVector(
2242 SrcVal, llvm::UndefValue::get(SrcVal->getType()), ExtMask);
2243 // build identity
2244 SmallVector<int, 4> Mask;
2245 for (unsigned i = 0; i != NumDstElts; ++i)
2246 Mask.push_back(i);
2247
2248 // When the vector size is odd and .odd or .hi is used, the last element
2249 // of the Elts constant array will be one past the size of the vector.
2250 // Ignore the last element here, if it is greater than the mask size.
2251 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
2252 NumSrcElts--;
2253
2254 // modify when what gets shuffled in
2255 for (unsigned i = 0; i != NumSrcElts; ++i)
2256 Mask[getAccessedFieldNo(i, Elts)] = i + NumDstElts;
2257 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, Mask);
2258 } else {
2259 // We should never shorten the vector
2260 llvm_unreachable("unexpected shorten vector length")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2260)
;
2261 }
2262 } else {
2263 // If the Src is a scalar (not a vector) it must be updating one element.
2264 unsigned InIdx = getAccessedFieldNo(0, Elts);
2265 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
2266 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
2267 }
2268
2269 Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
2270 Dst.isVolatileQualified());
2271}
2272
2273/// Store of global named registers are always calls to intrinsics.
2274void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
2275 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2276, __PRETTY_FUNCTION__))
2276 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2276, __PRETTY_FUNCTION__))
;
2277 llvm::MDNode *RegName = cast<llvm::MDNode>(
2278 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
2279 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2279, __PRETTY_FUNCTION__))
;
2280
2281 // We accept integer and pointer types only
2282 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
2283 llvm::Type *Ty = OrigTy;
2284 if (OrigTy->isPointerTy())
2285 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2286 llvm::Type *Types[] = { Ty };
2287
2288 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
2289 llvm::Value *Value = Src.getScalarVal();
2290 if (OrigTy->isPointerTy())
2291 Value = Builder.CreatePtrToInt(Value, Ty);
2292 Builder.CreateCall(
2293 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
2294}
2295
2296// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2297// generating write-barries API. It is currently a global, ivar,
2298// or neither.
2299static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
2300 LValue &LV,
2301 bool IsMemberAccess=false) {
2302 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
2303 return;
2304
2305 if (isa<ObjCIvarRefExpr>(E)) {
2306 QualType ExpTy = E->getType();
2307 if (IsMemberAccess && ExpTy->isPointerType()) {
2308 // If ivar is a structure pointer, assigning to field of
2309 // this struct follows gcc's behavior and makes it a non-ivar
2310 // writer-barrier conservatively.
2311 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2312 if (ExpTy->isRecordType()) {
2313 LV.setObjCIvar(false);
2314 return;
2315 }
2316 }
2317 LV.setObjCIvar(true);
2318 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
2319 LV.setBaseIvarExp(Exp->getBase());
2320 LV.setObjCArray(E->getType()->isArrayType());
2321 return;
2322 }
2323
2324 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
2325 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
2326 if (VD->hasGlobalStorage()) {
2327 LV.setGlobalObjCRef(true);
2328 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
2329 }
2330 }
2331 LV.setObjCArray(E->getType()->isArrayType());
2332 return;
2333 }
2334
2335 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
2336 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2337 return;
2338 }
2339
2340 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
2341 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2342 if (LV.isObjCIvar()) {
2343 // If cast is to a structure pointer, follow gcc's behavior and make it
2344 // a non-ivar write-barrier.
2345 QualType ExpTy = E->getType();
2346 if (ExpTy->isPointerType())
2347 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2348 if (ExpTy->isRecordType())
2349 LV.setObjCIvar(false);
2350 }
2351 return;
2352 }
2353
2354 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
2355 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
2356 return;
2357 }
2358
2359 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
2360 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2361 return;
2362 }
2363
2364 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
2365 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2366 return;
2367 }
2368
2369 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
2370 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2371 return;
2372 }
2373
2374 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
2375 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
2376 if (LV.isObjCIvar() && !LV.isObjCArray())
2377 // Using array syntax to assigning to what an ivar points to is not
2378 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
2379 LV.setObjCIvar(false);
2380 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
2381 // Using array syntax to assigning to what global points to is not
2382 // same as assigning to the global itself. {id *G;} G[i] = 0;
2383 LV.setGlobalObjCRef(false);
2384 return;
2385 }
2386
2387 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
2388 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
2389 // We don't know if member is an 'ivar', but this flag is looked at
2390 // only in the context of LV.isObjCIvar().
2391 LV.setObjCArray(E->getType()->isArrayType());
2392 return;
2393 }
2394}
2395
2396static llvm::Value *
2397EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
2398 llvm::Value *V, llvm::Type *IRType,
2399 StringRef Name = StringRef()) {
2400 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2401 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
2402}
2403
2404static LValue EmitThreadPrivateVarDeclLValue(
2405 CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
2406 llvm::Type *RealVarTy, SourceLocation Loc) {
2407 if (CGF.CGM.getLangOpts().OpenMPIRBuilder)
2408 Addr = CodeGenFunction::OMPBuilderCBHelpers::getAddrOfThreadPrivate(
2409 CGF, VD, Addr, Loc);
2410 else
2411 Addr =
2412 CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
2413
2414 Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
2415 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2416}
2417
2418static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
2419 const VarDecl *VD, QualType T) {
2420 llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
2421 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
2422 // Return an invalid address if variable is MT_To and unified
2423 // memory is not enabled. For all other cases: MT_Link and
2424 // MT_To with unified memory, return a valid address.
2425 if (!Res || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
2426 !CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory()))
2427 return Address::invalid();
2428 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2431, __PRETTY_FUNCTION__))
2429 (*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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2431, __PRETTY_FUNCTION__))
2430 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2431, __PRETTY_FUNCTION__))
2431 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2431, __PRETTY_FUNCTION__))
;
2432 QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
2433 Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
2434 return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2435}
2436
2437Address
2438CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
2439 LValueBaseInfo *PointeeBaseInfo,
2440 TBAAAccessInfo *PointeeTBAAInfo) {
2441 llvm::LoadInst *Load =
2442 Builder.CreateLoad(RefLVal.getAddress(*this), RefLVal.isVolatile());
2443 CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
2444
2445 CharUnits Align = CGM.getNaturalTypeAlignment(
2446 RefLVal.getType()->getPointeeType(), PointeeBaseInfo, PointeeTBAAInfo,
2447 /* forPointeeType= */ true);
2448 return Address(Load, Align);
2449}
2450
2451LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
2452 LValueBaseInfo PointeeBaseInfo;
2453 TBAAAccessInfo PointeeTBAAInfo;
2454 Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
2455 &PointeeTBAAInfo);
2456 return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
2457 PointeeBaseInfo, PointeeTBAAInfo);
2458}
2459
2460Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
2461 const PointerType *PtrTy,
2462 LValueBaseInfo *BaseInfo,
2463 TBAAAccessInfo *TBAAInfo) {
2464 llvm::Value *Addr = Builder.CreateLoad(Ptr);
2465 return Address(Addr, CGM.getNaturalTypeAlignment(PtrTy->getPointeeType(),
2466 BaseInfo, TBAAInfo,
2467 /*forPointeeType=*/true));
2468}
2469
2470LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
2471 const PointerType *PtrTy) {
2472 LValueBaseInfo BaseInfo;
2473 TBAAAccessInfo TBAAInfo;
2474 Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
2475 return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
2476}
2477
2478static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
2479 const Expr *E, const VarDecl *VD) {
2480 QualType T = E->getType();
2481
2482 // If it's thread_local, emit a call to its wrapper function instead.
2483 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
2484 CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
2485 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
2486 // Check if the variable is marked as declare target with link clause in
2487 // device codegen.
2488 if (CGF.getLangOpts().OpenMPIsDevice) {
2489 Address Addr = emitDeclTargetVarDeclLValue(CGF, VD, T);
2490 if (Addr.isValid())
2491 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2492 }
2493
2494 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2495 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2496 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
2497 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2498 Address Addr(V, Alignment);
2499 // Emit reference to the private copy of the variable if it is an OpenMP
2500 // threadprivate variable.
2501 if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
2502 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2503 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
2504 E->getExprLoc());
2505 }
2506 LValue LV = VD->getType()->isReferenceType() ?
2507 CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2508 AlignmentSource::Decl) :
2509 CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2510 setObjCGCLValueClass(CGF.getContext(), E, LV);
2511 return LV;
2512}
2513
2514static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
2515 GlobalDecl GD) {
2516 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2517 if (FD->hasAttr<WeakRefAttr>()) {
2518 ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
2519 return aliasee.getPointer();
2520 }
2521
2522 llvm::Constant *V = CGM.GetAddrOfFunction(GD);
2523 if (!FD->hasPrototype()) {
2524 if (const FunctionProtoType *Proto =
2525 FD->getType()->getAs<FunctionProtoType>()) {
2526 // Ugly case: for a K&R-style definition, the type of the definition
2527 // isn't the same as the type of a use. Correct for this with a
2528 // bitcast.
2529 QualType NoProtoType =
2530 CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
2531 NoProtoType = CGM.getContext().getPointerType(NoProtoType);
2532 V = llvm::ConstantExpr::getBitCast(V,
2533 CGM.getTypes().ConvertType(NoProtoType));
2534 }
2535 }
2536 return V;
2537}
2538
2539static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF, const Expr *E,
2540 GlobalDecl GD) {
2541 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
2542 llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, GD);
2543 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
2544 return CGF.MakeAddrLValue(V, E->getType(), Alignment,
2545 AlignmentSource::Decl);
2546}
2547
2548static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
2549 llvm::Value *ThisValue) {
2550 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
2551 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
2552 return CGF.EmitLValueForField(LV, FD);
2553}
2554
2555/// Named Registers are named metadata pointing to the register name
2556/// which will be read from/written to as an argument to the intrinsic
2557/// @llvm.read/write_register.
2558/// So far, only the name is being passed down, but other options such as
2559/// register type, allocation type or even optimization options could be
2560/// passed down via the metadata node.
2561static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
2562 SmallString<64> Name("llvm.named.register.");
2563 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
2564 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2565, __PRETTY_FUNCTION__))
2565 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2565, __PRETTY_FUNCTION__))
;
2566 Name.append(Asm->getLabel());
2567 llvm::NamedMDNode *M =
2568 CGM.getModule().getOrInsertNamedMetadata(Name);
2569 if (M->getNumOperands() == 0) {
2570 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
2571 Asm->getLabel());
2572 llvm::Metadata *Ops[] = {Str};
2573 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
2574 }
2575
2576 CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
2577
2578 llvm::Value *Ptr =
2579 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
2580 return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
2581}
2582
2583/// Determine whether we can emit a reference to \p VD from the current
2584/// context, despite not necessarily having seen an odr-use of the variable in
2585/// this context.
2586static bool canEmitSpuriousReferenceToVariable(CodeGenFunction &CGF,
2587 const DeclRefExpr *E,
2588 const VarDecl *VD,
2589 bool IsConstant) {
2590 // For a variable declared in an enclosing scope, do not emit a spurious
2591 // reference even if we have a capture, as that will emit an unwarranted
2592 // reference to our capture state, and will likely generate worse code than
2593 // emitting a local copy.
2594 if (E->refersToEnclosingVariableOrCapture())
2595 return false;
2596
2597 // For a local declaration declared in this function, we can always reference
2598 // it even if we don't have an odr-use.
2599 if (VD->hasLocalStorage()) {
2600 return VD->getDeclContext() ==
2601 dyn_cast_or_null<DeclContext>(CGF.CurCodeDecl);
2602 }
2603
2604 // For a global declaration, we can emit a reference to it if we know
2605 // for sure that we are able to emit a definition of it.
2606 VD = VD->getDefinition(CGF.getContext());
2607 if (!VD)
2608 return false;
2609
2610 // Don't emit a spurious reference if it might be to a variable that only
2611 // exists on a different device / target.
2612 // FIXME: This is unnecessarily broad. Check whether this would actually be a
2613 // cross-target reference.
2614 if (CGF.getLangOpts().OpenMP || CGF.getLangOpts().CUDA ||
2615 CGF.getLangOpts().OpenCL) {
2616 return false;
2617 }
2618
2619 // We can emit a spurious reference only if the linkage implies that we'll
2620 // be emitting a non-interposable symbol that will be retained until link
2621 // time.
2622 switch (CGF.CGM.getLLVMLinkageVarDefinition(VD, IsConstant)) {
2623 case llvm::GlobalValue::ExternalLinkage:
2624 case llvm::GlobalValue::LinkOnceODRLinkage:
2625 case llvm::GlobalValue::WeakODRLinkage:
2626 case llvm::GlobalValue::InternalLinkage:
2627 case llvm::GlobalValue::PrivateLinkage:
2628 return true;
2629 default:
2630 return false;
2631 }
2632}
2633
2634LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
2635 const NamedDecl *ND = E->getDecl();
2636 QualType T = E->getType();
2637
2638 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2639, __PRETTY_FUNCTION__))
2639 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2639, __PRETTY_FUNCTION__))
;
2640
2641 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2642 // Global Named registers access via intrinsics only
2643 if (VD->getStorageClass() == SC_Register &&
2644 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
2645 return EmitGlobalNamedRegister(VD, CGM);
2646
2647 // If this DeclRefExpr does not constitute an odr-use of the variable,
2648 // we're not permitted to emit a reference to it in general, and it might
2649 // not be captured if capture would be necessary for a use. Emit the
2650 // constant value directly instead.
2651 if (E->isNonOdrUse() == NOUR_Constant &&
2652 (VD->getType()->isReferenceType() ||
2653 !canEmitSpuriousReferenceToVariable(*this, E, VD, true))) {
2654 VD->getAnyInitializer(VD);
2655 llvm::Constant *Val = ConstantEmitter(*this).emitAbstract(
2656 E->getLocation(), *VD->evaluateValue(), VD->getType());
2657 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2657, __PRETTY_FUNCTION__))
;
2658
2659 Address Addr = Address::invalid();
2660 if (!VD->getType()->isReferenceType()) {
2661 // Spill the constant value to a global.
2662 Addr = CGM.createUnnamedGlobalFrom(*VD, Val,
2663 getContext().getDeclAlign(VD));
2664 llvm::Type *VarTy = getTypes().ConvertTypeForMem(VD->getType());
2665 auto *PTy = llvm::PointerType::get(
2666 VarTy, getContext().getTargetAddressSpace(VD->getType()));
2667 if (PTy != Addr.getType())
2668 Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, PTy);
2669 } else {
2670 // Should we be using the alignment of the constant pointer we emitted?
2671 CharUnits Alignment =
2672 CGM.getNaturalTypeAlignment(E->getType(),
2673 /* BaseInfo= */ nullptr,
2674 /* TBAAInfo= */ nullptr,
2675 /* forPointeeType= */ true);
2676 Addr = Address(Val, Alignment);
2677 }
2678 return MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2679 }
2680
2681 // FIXME: Handle other kinds of non-odr-use DeclRefExprs.
2682
2683 // Check for captured variables.
2684 if (E->refersToEnclosingVariableOrCapture()) {
2685 VD = VD->getCanonicalDecl();
2686 if (auto *FD = LambdaCaptureFields.lookup(VD))
2687 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
2688 if (CapturedStmtInfo) {
2689 auto I = LocalDeclMap.find(VD);
2690 if (I != LocalDeclMap.end()) {
2691 LValue CapLVal;
2692 if (VD->getType()->isReferenceType())
2693 CapLVal = EmitLoadOfReferenceLValue(I->second, VD->getType(),
2694 AlignmentSource::Decl);
2695 else
2696 CapLVal = MakeAddrLValue(I->second, T);
2697 // Mark lvalue as nontemporal if the variable is marked as nontemporal
2698 // in simd context.
2699 if (getLangOpts().OpenMP &&
2700 CGM.getOpenMPRuntime().isNontemporalDecl(VD))
2701 CapLVal.setNontemporal(/*Value=*/true);
2702 return CapLVal;
2703 }
2704 LValue CapLVal =
2705 EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
2706 CapturedStmtInfo->getContextValue());
2707 CapLVal = MakeAddrLValue(
2708 Address(CapLVal.getPointer(*this), getContext().getDeclAlign(VD)),
2709 CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
2710 CapLVal.getTBAAInfo());
2711 // Mark lvalue as nontemporal if the variable is marked as nontemporal
2712 // in simd context.
2713 if (getLangOpts().OpenMP &&
2714 CGM.getOpenMPRuntime().isNontemporalDecl(VD))
2715 CapLVal.setNontemporal(/*Value=*/true);
2716 return CapLVal;
2717 }
2718
2719 assert(isa<BlockDecl>(CurCodeDecl))((isa<BlockDecl>(CurCodeDecl)) ? static_cast<void>
(0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2719, __PRETTY_FUNCTION__))
;
2720 Address addr = GetAddrOfBlockDecl(VD);
2721 return MakeAddrLValue(addr, T, AlignmentSource::Decl);
2722 }
2723 }
2724
2725 // FIXME: We should be able to assert this for FunctionDecls as well!
2726 // FIXME: We should be able to assert this for all DeclRefExprs, not just
2727 // those with a valid source location.
2728 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2730, __PRETTY_FUNCTION__))
2729 !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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2730, __PRETTY_FUNCTION__))
2730 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2730, __PRETTY_FUNCTION__))
;
2731
2732 if (ND->hasAttr<WeakRefAttr>()) {
2733 const auto *VD = cast<ValueDecl>(ND);
2734 ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
2735 return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
2736 }
2737
2738 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2739 // Check if this is a global variable.
2740 if (VD->hasLinkage() || VD->isStaticDataMember())
2741 return EmitGlobalVarDeclLValue(*this, E, VD);
2742
2743 Address addr = Address::invalid();
2744
2745 // The variable should generally be present in the local decl map.
2746 auto iter = LocalDeclMap.find(VD);
2747 if (iter != LocalDeclMap.end()) {
2748 addr = iter->second;
2749
2750 // Otherwise, it might be static local we haven't emitted yet for
2751 // some reason; most likely, because it's in an outer function.
2752 } else if (VD->isStaticLocal()) {
2753 addr = Address(CGM.getOrCreateStaticVarDecl(
2754 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false)),
2755 getContext().getDeclAlign(VD));
2756
2757 // No other cases for now.
2758 } else {
2759 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2759)
;
2760 }
2761
2762
2763 // Check for OpenMP threadprivate variables.
2764 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
2765 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2766 return EmitThreadPrivateVarDeclLValue(
2767 *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
2768 E->getExprLoc());
2769 }
2770
2771 // Drill into block byref variables.
2772 bool isBlockByref = VD->isEscapingByref();
2773 if (isBlockByref) {
2774 addr = emitBlockByrefAddress(addr, VD);
2775 }
2776
2777 // Drill into reference types.
2778 LValue LV = VD->getType()->isReferenceType() ?
2779 EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
2780 MakeAddrLValue(addr, T, AlignmentSource::Decl);
2781
2782 bool isLocalStorage = VD->hasLocalStorage();
2783
2784 bool NonGCable = isLocalStorage &&
2785 !VD->getType()->isReferenceType() &&
2786 !isBlockByref;
2787 if (NonGCable) {
2788 LV.getQuals().removeObjCGCAttr();
2789 LV.setNonGC(true);
2790 }
2791
2792 bool isImpreciseLifetime =
2793 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2794 if (isImpreciseLifetime)
2795 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2796 setObjCGCLValueClass(getContext(), E, LV);
2797 return LV;
2798 }
2799
2800 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2801 return EmitFunctionDeclLValue(*this, E, FD);
2802
2803 // FIXME: While we're emitting a binding from an enclosing scope, all other
2804 // DeclRefExprs we see should be implicitly treated as if they also refer to
2805 // an enclosing scope.
2806 if (const auto *BD = dyn_cast<BindingDecl>(ND))
2807 return EmitLValue(BD->getBinding());
2808
2809 // We can form DeclRefExprs naming GUID declarations when reconstituting
2810 // non-type template parameters into expressions.
2811 if (const auto *GD = dyn_cast<MSGuidDecl>(ND))
2812 return MakeAddrLValue(CGM.GetAddrOfMSGuidDecl(GD), T,
2813 AlignmentSource::Decl);
2814
2815 llvm_unreachable("Unhandled DeclRefExpr")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2815)
;
2816}
2817
2818LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2819 // __extension__ doesn't affect lvalue-ness.
2820 if (E->getOpcode() == UO_Extension)
2821 return EmitLValue(E->getSubExpr());
2822
2823 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2824 switch (E->getOpcode()) {
2825 default: llvm_unreachable("Unknown unary operator lvalue!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2825)
;
2826 case UO_Deref: {
2827 QualType T = E->getSubExpr()->getType()->getPointeeType();
2828 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2828, __PRETTY_FUNCTION__))
;
2829
2830 LValueBaseInfo BaseInfo;
2831 TBAAAccessInfo TBAAInfo;
2832 Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
2833 &TBAAInfo);
2834 LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
2835 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2836
2837 // We should not generate __weak write barrier on indirect reference
2838 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2839 // But, we continue to generate __strong write barrier on indirect write
2840 // into a pointer to object.
2841 if (getLangOpts().ObjC &&
2842 getLangOpts().getGC() != LangOptions::NonGC &&
2843 LV.isObjCWeak())
2844 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2845 return LV;
2846 }
2847 case UO_Real:
2848 case UO_Imag: {
2849 LValue LV = EmitLValue(E->getSubExpr());
2850 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2850, __PRETTY_FUNCTION__))
;
2851
2852 // __real is valid on scalars. This is a faster way of testing that.
2853 // __imag can only produce an rvalue on scalars.
2854 if (E->getOpcode() == UO_Real &&
2855 !LV.getAddress(*this).getElementType()->isStructTy()) {
2856 assert(E->getSubExpr()->getType()->isArithmeticType())((E->getSubExpr()->getType()->isArithmeticType()) ? static_cast
<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2856, __PRETTY_FUNCTION__))
;
2857 return LV;
2858 }
2859
2860 QualType T = ExprTy->castAs<ComplexType>()->getElementType();
2861
2862 Address Component =
2863 (E->getOpcode() == UO_Real
2864 ? emitAddrOfRealComponent(LV.getAddress(*this), LV.getType())
2865 : emitAddrOfImagComponent(LV.getAddress(*this), LV.getType()));
2866 LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
2867 CGM.getTBAAInfoForSubobject(LV, T));
2868 ElemLV.getQuals().addQualifiers(LV.getQuals());
2869 return ElemLV;
2870 }
2871 case UO_PreInc:
2872 case UO_PreDec: {
2873 LValue LV = EmitLValue(E->getSubExpr());
2874 bool isInc = E->getOpcode() == UO_PreInc;
2875
2876 if (E->getType()->isAnyComplexType())
2877 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2878 else
2879 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2880 return LV;
2881 }
2882 }
2883}
2884
2885LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2886 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2887 E->getType(), AlignmentSource::Decl);
2888}
2889
2890LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2891 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2892 E->getType(), AlignmentSource::Decl);
2893}
2894
2895LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2896 auto SL = E->getFunctionName();
2897 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 2897, __PRETTY_FUNCTION__))
;
2898 StringRef FnName = CurFn->getName();
2899 if (FnName.startswith("\01"))
2900 FnName = FnName.substr(1);
2901 StringRef NameItems[] = {
2902 PredefinedExpr::getIdentKindName(E->getIdentKind()), FnName};
2903 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2904 if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
2905 std::string Name = std::string(SL->getString());
2906 if (!Name.empty()) {
2907 unsigned Discriminator =
2908 CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
2909 if (Discriminator)
2910 Name += "_" + Twine(Discriminator + 1).str();
2911 auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
2912 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2913 } else {
2914 auto C =
2915 CGM.GetAddrOfConstantCString(std::string(FnName), GVName.c_str());
2916 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2917 }
2918 }
2919 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2920 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2921}
2922
2923/// Emit a type description suitable for use by a runtime sanitizer library. The
2924/// format of a type descriptor is
2925///
2926/// \code
2927/// { i16 TypeKind, i16 TypeInfo }
2928/// \endcode
2929///
2930/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2931/// integer, 1 for a floating point value, and -1 for anything else.
2932llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2933 // Only emit each type's descriptor once.
2934 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2935 return C;
2936
2937 uint16_t TypeKind = -1;
2938 uint16_t TypeInfo = 0;
2939
2940 if (T->isIntegerType()) {
2941 TypeKind = 0;
2942 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2943 (T->isSignedIntegerType() ? 1 : 0);
2944 } else if (T->isFloatingType()) {
2945 TypeKind = 1;
2946 TypeInfo = getContext().getTypeSize(T);
2947 }
2948
2949 // Format the type name as if for a diagnostic, including quotes and
2950 // optionally an 'aka'.
2951 SmallString<32> Buffer;
2952 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2953 (intptr_t)T.getAsOpaquePtr(),
2954 StringRef(), StringRef(), None, Buffer,
2955 None);
2956
2957 llvm::Constant *Components[] = {
2958 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2959 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2960 };
2961 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2962
2963 auto *GV = new llvm::GlobalVariable(
2964 CGM.getModule(), Descriptor->getType(),
2965 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2966 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2967 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2968
2969 // Remember the descriptor for this type.
2970 CGM.setTypeDescriptorInMap(T, GV);
2971
2972 return GV;
2973}
2974
2975llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2976 llvm::Type *TargetTy = IntPtrTy;
2977
2978 if (V->getType() == TargetTy)
2979 return V;
2980
2981 // Floating-point types which fit into intptr_t are bitcast to integers
2982 // and then passed directly (after zero-extension, if necessary).
2983 if (V->getType()->isFloatingPointTy()) {
2984 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2985 if (Bits <= TargetTy->getIntegerBitWidth())
2986 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2987 Bits));
2988 }
2989
2990 // Integers which fit in intptr_t are zero-extended and passed directly.
2991 if (V->getType()->isIntegerTy() &&
2992 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2993 return Builder.CreateZExt(V, TargetTy);
2994
2995 // Pointers are passed directly, everything else is passed by address.
2996 if (!V->getType()->isPointerTy()) {
2997 Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
2998 Builder.CreateStore(V, Ptr);
2999 V = Ptr.getPointer();
3000 }
3001 return Builder.CreatePtrToInt(V, TargetTy);
3002}
3003
3004/// Emit a representation of a SourceLocation for passing to a handler
3005/// in a sanitizer runtime library. The format for this data is:
3006/// \code
3007/// struct SourceLocation {
3008/// const char *Filename;
3009/// int32_t Line, Column;
3010/// };
3011/// \endcode
3012/// For an invalid SourceLocation, the Filename pointer is null.
3013llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
3014 llvm::Constant *Filename;
3015 int Line, Column;
3016
3017 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
3018 if (PLoc.isValid()) {
3019 StringRef FilenameString = PLoc.getFilename();
3020
3021 int PathComponentsToStrip =
3022 CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
3023 if (PathComponentsToStrip < 0) {
3024 assert(PathComponentsToStrip != INT_MIN)((PathComponentsToStrip != (-2147483647 -1)) ? static_cast<
void> (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3024, __PRETTY_FUNCTION__))
;
3025 int PathComponentsToKeep = -PathComponentsToStrip;
3026 auto I = llvm::sys::path::rbegin(FilenameString);
3027 auto E = llvm::sys::path::rend(FilenameString);
3028 while (I != E && --PathComponentsToKeep)
3029 ++I;
3030
3031 FilenameString = FilenameString.substr(I - E);
3032 } else if (PathComponentsToStrip > 0) {
3033 auto I = llvm::sys::path::begin(FilenameString);
3034 auto E = llvm::sys::path::end(FilenameString);
3035 while (I != E && PathComponentsToStrip--)
3036 ++I;
3037
3038 if (I != E)
3039 FilenameString =
3040 FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
3041 else
3042 FilenameString = llvm::sys::path::filename(FilenameString);
3043 }
3044
3045 auto FilenameGV =
3046 CGM.GetAddrOfConstantCString(std::string(FilenameString), ".src");
3047 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
3048 cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
3049 Filename = FilenameGV.getPointer();
3050 Line = PLoc.getLine();
3051 Column = PLoc.getColumn();
3052 } else {
3053 Filename = llvm::Constant::getNullValue(Int8PtrTy);
3054 Line = Column = 0;
3055 }
3056
3057 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
3058 Builder.getInt32(Column)};
3059
3060 return llvm::ConstantStruct::getAnon(Data);
3061}
3062
3063namespace {
3064/// Specify under what conditions this check can be recovered
3065enum class CheckRecoverableKind {
3066 /// Always terminate program execution if this check fails.
3067 Unrecoverable,
3068 /// Check supports recovering, runtime has both fatal (noreturn) and
3069 /// non-fatal handlers for this check.
3070 Recoverable,
3071 /// Runtime conditionally aborts, always need to support recovery.
3072 AlwaysRecoverable
3073};
3074}
3075
3076static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
3077 assert(Kind.countPopulation() == 1)((Kind.countPopulation() == 1) ? static_cast<void> (0) :
__assert_fail ("Kind.countPopulation() == 1", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3077, __PRETTY_FUNCTION__))
;
3078 if (Kind == SanitizerKind::Function || Kind == SanitizerKind::Vptr)
3079 return CheckRecoverableKind::AlwaysRecoverable;
3080 else if (Kind == SanitizerKind::Return || Kind == SanitizerKind::Unreachable)
3081 return CheckRecoverableKind::Unrecoverable;
3082 else
3083 return CheckRecoverableKind::Recoverable;
3084}
3085
3086namespace {
3087struct SanitizerHandlerInfo {
3088 char const *const Name;
3089 unsigned Version;
3090};
3091}
3092
3093const SanitizerHandlerInfo SanitizerHandlers[] = {
3094#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
3095 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)
3096#undef SANITIZER_CHECK
3097};
3098
3099static void emitCheckHandlerCall(CodeGenFunction &CGF,
3100 llvm::FunctionType *FnType,
3101 ArrayRef<llvm::Value *> FnArgs,
3102 SanitizerHandler CheckHandler,
3103 CheckRecoverableKind RecoverKind, bool IsFatal,
3104 llvm::BasicBlock *ContBB) {
3105 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable)((IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable
) ? static_cast<void> (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3105, __PRETTY_FUNCTION__))
;
3106 Optional<ApplyDebugLocation> DL;
3107 if (!CGF.Builder.getCurrentDebugLocation()) {
3108 // Ensure that the call has at least an artificial debug location.
3109 DL.emplace(CGF, SourceLocation());
3110 }
3111 bool NeedsAbortSuffix =
3112 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
3113 bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
3114 const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
3115 const StringRef CheckName = CheckInfo.Name;
3116 std::string FnName = "__ubsan_handle_" + CheckName.str();
3117 if (CheckInfo.Version && !MinimalRuntime)
3118 FnName += "_v" + llvm::utostr(CheckInfo.Version);
3119 if (MinimalRuntime)
3120 FnName += "_minimal";
3121 if (NeedsAbortSuffix)
3122 FnName += "_abort";
3123 bool MayReturn =
3124 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
3125
3126 llvm::AttrBuilder B;
3127 if (!MayReturn) {
3128 B.addAttribute(llvm::Attribute::NoReturn)
3129 .addAttribute(llvm::Attribute::NoUnwind);
3130 }
3131 B.addAttribute(llvm::Attribute::UWTable);
3132
3133 llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
3134 FnType, FnName,
3135 llvm::AttributeList::get(CGF.getLLVMContext(),
3136 llvm::AttributeList::FunctionIndex, B),
3137 /*Local=*/true);
3138 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
3139 if (!MayReturn) {
3140 HandlerCall->setDoesNotReturn();
3141 CGF.Builder.CreateUnreachable();
3142 } else {
3143 CGF.Builder.CreateBr(ContBB);
3144 }
3145}
3146
3147void CodeGenFunction::EmitCheck(
3148 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
3149 SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
3150 ArrayRef<llvm::Value *> DynamicArgs) {
3151 assert(IsSanitizerScope)((IsSanitizerScope) ? static_cast<void> (0) : __assert_fail
("IsSanitizerScope", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3151, __PRETTY_FUNCTION__))
;
3152 assert(Checked.size() > 0)((Checked.size() > 0) ? static_cast<void> (0) : __assert_fail
("Checked.size() > 0", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3152, __PRETTY_FUNCTION__))
;
3153 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3154, __PRETTY_FUNCTION__))
3154 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3154, __PRETTY_FUNCTION__))
;
3155 const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
3156
3157 llvm::Value *FatalCond = nullptr;
3158 llvm::Value *RecoverableCond = nullptr;
3159 llvm::Value *TrapCond = nullptr;
3160 for (int i = 0, n = Checked.size(); i < n; ++i) {
3161 llvm::Value *Check = Checked[i].first;
3162 // -fsanitize-trap= overrides -fsanitize-recover=.
3163 llvm::Value *&Cond =
3164 CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
3165 ? TrapCond
3166 : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
3167 ? RecoverableCond
3168 : FatalCond;
3169 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
3170 }
3171
3172 if (TrapCond)
3173 EmitTrapCheck(TrapCond);
3174 if (!FatalCond && !RecoverableCond)
3175 return;
3176
3177 llvm::Value *JointCond;
3178 if (FatalCond && RecoverableCond)
3179 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
3180 else
3181 JointCond = FatalCond ? FatalCond : RecoverableCond;
3182 assert(JointCond)((JointCond) ? static_cast<void> (0) : __assert_fail ("JointCond"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3182, __PRETTY_FUNCTION__))
;
3183
3184 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
3185 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3185, __PRETTY_FUNCTION__))
;
3186#ifndef NDEBUG
3187 for (int i = 1, n = Checked.size(); i < n; ++i) {
3188 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3189, __PRETTY_FUNCTION__))
3189 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3189, __PRETTY_FUNCTION__))
;
3190 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3190, __PRETTY_FUNCTION__))
;
3191 }
3192#endif
3193
3194 llvm::BasicBlock *Cont = createBasicBlock("cont");
3195 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
3196 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
3197 // Give hint that we very much don't expect to execute the handler
3198 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
3199 llvm::MDBuilder MDHelper(getLLVMContext());
3200 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3201 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
3202 EmitBlock(Handlers);
3203
3204 // Handler functions take an i8* pointing to the (handler-specific) static
3205 // information block, followed by a sequence of intptr_t arguments
3206 // representing operand values.
3207 SmallVector<llvm::Value *, 4> Args;
3208 SmallVector<llvm::Type *, 4> ArgTypes;
3209 if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
3210 Args.reserve(DynamicArgs.size() + 1);
3211 ArgTypes.reserve(DynamicArgs.size() + 1);
3212
3213 // Emit handler arguments and create handler function type.
3214 if (!StaticArgs.empty()) {
3215 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3216 auto *InfoPtr =
3217 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3218 llvm::GlobalVariable::PrivateLinkage, Info);
3219 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3220 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3221 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
3222 ArgTypes.push_back(Int8PtrTy);
3223 }
3224
3225 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
3226 Args.push_back(EmitCheckValue(DynamicArgs[i]));
3227 ArgTypes.push_back(IntPtrTy);
3228 }
3229 }
3230
3231 llvm::FunctionType *FnType =
3232 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
3233
3234 if (!FatalCond || !RecoverableCond) {
3235 // Simple case: we need to generate a single handler call, either
3236 // fatal, or non-fatal.
3237 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
3238 (FatalCond != nullptr), Cont);
3239 } else {
3240 // Emit two handler calls: first one for set of unrecoverable checks,
3241 // another one for recoverable.
3242 llvm::BasicBlock *NonFatalHandlerBB =
3243 createBasicBlock("non_fatal." + CheckName);
3244 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
3245 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
3246 EmitBlock(FatalHandlerBB);
3247 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
3248 NonFatalHandlerBB);
3249 EmitBlock(NonFatalHandlerBB);
3250 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
3251 Cont);
3252 }
3253
3254 EmitBlock(Cont);
3255}
3256
3257void CodeGenFunction::EmitCfiSlowPathCheck(
3258 SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
3259 llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
3260 llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
3261
3262 llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
3263 llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
3264
3265 llvm::MDBuilder MDHelper(getLLVMContext());
3266 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3267 BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
3268
3269 EmitBlock(CheckBB);
3270
3271 bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
3272
3273 llvm::CallInst *CheckCall;
3274 llvm::FunctionCallee SlowPathFn;
3275 if (WithDiag) {
3276 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3277 auto *InfoPtr =
3278 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3279 llvm::GlobalVariable::PrivateLinkage, Info);
3280 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3281 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3282
3283 SlowPathFn = CGM.getModule().getOrInsertFunction(
3284 "__cfi_slowpath_diag",
3285 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
3286 false));
3287 CheckCall = Builder.CreateCall(
3288 SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
3289 } else {
3290 SlowPathFn = CGM.getModule().getOrInsertFunction(
3291 "__cfi_slowpath",
3292 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
3293 CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
3294 }
3295
3296 CGM.setDSOLocal(
3297 cast<llvm::GlobalValue>(SlowPathFn.getCallee()->stripPointerCasts()));
3298 CheckCall->setDoesNotThrow();
3299
3300 EmitBlock(Cont);
3301}
3302
3303// Emit a stub for __cfi_check function so that the linker knows about this
3304// symbol in LTO mode.
3305void CodeGenFunction::EmitCfiCheckStub() {
3306 llvm::Module *M = &CGM.getModule();
3307 auto &Ctx = M->getContext();
3308 llvm::Function *F = llvm::Function::Create(
3309 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
3310 llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
3311 CGM.setDSOLocal(F);
3312 llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
3313 // FIXME: consider emitting an intrinsic call like
3314 // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
3315 // which can be lowered in CrossDSOCFI pass to the actual contents of
3316 // __cfi_check. This would allow inlining of __cfi_check calls.
3317 llvm::CallInst::Create(
3318 llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
3319 llvm::ReturnInst::Create(Ctx, nullptr, BB);
3320}
3321
3322// This function is basically a switch over the CFI failure kind, which is
3323// extracted from CFICheckFailData (1st function argument). Each case is either
3324// llvm.trap or a call to one of the two runtime handlers, based on
3325// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
3326// failure kind) traps, but this should really never happen. CFICheckFailData
3327// can be nullptr if the calling module has -fsanitize-trap behavior for this
3328// check kind; in this case __cfi_check_fail traps as well.
3329void CodeGenFunction::EmitCfiCheckFail() {
3330 SanitizerScope SanScope(this);
3331 FunctionArgList Args;
3332 ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
3333 ImplicitParamDecl::Other);
3334 ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
3335 ImplicitParamDecl::Other);
3336 Args.push_back(&ArgData);
3337 Args.push_back(&ArgAddr);
3338
3339 const CGFunctionInfo &FI =
3340 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
3341
3342 llvm::Function *F = llvm::Function::Create(
3343 llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
3344 llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
3345
3346 CGM.SetLLVMFunctionAttributes(GlobalDecl(), FI, F);
3347 CGM.SetLLVMFunctionAttributesForDefinition(nullptr, F);
3348 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
3349
3350 StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
3351 SourceLocation());
3352
3353 // This function should not be affected by blacklist. This function does
3354 // not have a source location, but "src:*" would still apply. Revert any
3355 // changes to SanOpts made in StartFunction.
3356 SanOpts = CGM.getLangOpts().Sanitize;
3357
3358 llvm::Value *Data =
3359 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
3360 CGM.getContext().VoidPtrTy, ArgData.getLocation());
3361 llvm::Value *Addr =
3362 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
3363 CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
3364
3365 // Data == nullptr means the calling module has trap behaviour for this check.
3366 llvm::Value *DataIsNotNullPtr =
3367 Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
3368 EmitTrapCheck(DataIsNotNullPtr);
3369
3370 llvm::StructType *SourceLocationTy =
3371 llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
3372 llvm::StructType *CfiCheckFailDataTy =
3373 llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
3374
3375 llvm::Value *V = Builder.CreateConstGEP2_32(
3376 CfiCheckFailDataTy,
3377 Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
3378 0);
3379 Address CheckKindAddr(V, getIntAlign());
3380 llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
3381
3382 llvm::Value *AllVtables = llvm::MetadataAsValue::get(
3383 CGM.getLLVMContext(),
3384 llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
3385 llvm::Value *ValidVtable = Builder.CreateZExt(
3386 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
3387 {Addr, AllVtables}),
3388 IntPtrTy);
3389
3390 const std::pair<int, SanitizerMask> CheckKinds[] = {
3391 {CFITCK_VCall, SanitizerKind::CFIVCall},
3392 {CFITCK_NVCall, SanitizerKind::CFINVCall},
3393 {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
3394 {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
3395 {CFITCK_ICall, SanitizerKind::CFIICall}};
3396
3397 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
3398 for (auto CheckKindMaskPair : CheckKinds) {
3399 int Kind = CheckKindMaskPair.first;
3400 SanitizerMask Mask = CheckKindMaskPair.second;
3401 llvm::Value *Cond =
3402 Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
3403 if (CGM.getLangOpts().Sanitize.has(Mask))
3404 EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
3405 {Data, Addr, ValidVtable});
3406 else
3407 EmitTrapCheck(Cond);
3408 }
3409
3410 FinishFunction();
3411 // The only reference to this function will be created during LTO link.
3412 // Make sure it survives until then.
3413 CGM.addUsedGlobal(F);
3414}
3415
3416void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
3417 if (SanOpts.has(SanitizerKind::Unreachable)) {
3418 SanitizerScope SanScope(this);
3419 EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
3420 SanitizerKind::Unreachable),
3421 SanitizerHandler::BuiltinUnreachable,
3422 EmitCheckSourceLocation(Loc), None);
3423 }
3424 Builder.CreateUnreachable();
3425}
3426
3427void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
3428 llvm::BasicBlock *Cont = createBasicBlock("cont");
3429
3430 // If we're optimizing, collapse all calls to trap down to just one per
3431 // function to save on code size.
3432 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
3433 TrapBB = createBasicBlock("trap");
3434 Builder.CreateCondBr(Checked, Cont, TrapBB);
3435 EmitBlock(TrapBB);
3436 llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
3437 TrapCall->setDoesNotReturn();
3438 TrapCall->setDoesNotThrow();
3439 Builder.CreateUnreachable();
3440 } else {
3441 Builder.CreateCondBr(Checked, Cont, TrapBB);
3442 }
3443
3444 EmitBlock(Cont);
3445}
3446
3447llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
3448 llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
3449
3450 if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
3451 auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
3452 CGM.getCodeGenOpts().TrapFuncName);
3453 TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
3454 }
3455
3456 return TrapCall;
3457}
3458
3459Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
3460 LValueBaseInfo *BaseInfo,
3461 TBAAAccessInfo *TBAAInfo) {
3462 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3463, __PRETTY_FUNCTION__))
3463 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3463, __PRETTY_FUNCTION__))
;
3464
3465 // Expressions of array type can't be bitfields or vector elements.
3466 LValue LV = EmitLValue(E);
3467 Address Addr = LV.getAddress(*this);
3468
3469 // If the array type was an incomplete type, we need to make sure
3470 // the decay ends up being the right type.
3471 llvm::Type *NewTy = ConvertType(E->getType());
3472 Addr = Builder.CreateElementBitCast(Addr, NewTy);
3473
3474 // Note that VLA pointers are always decayed, so we don't need to do
3475 // anything here.
3476 if (!E->getType()->isVariableArrayType()) {
3477 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3478, __PRETTY_FUNCTION__))
3478 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3478, __PRETTY_FUNCTION__))
;
3479 Addr = Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3480 }
3481
3482 // The result of this decay conversion points to an array element within the
3483 // base lvalue. However, since TBAA currently does not support representing
3484 // accesses to elements of member arrays, we conservatively represent accesses
3485 // to the pointee object as if it had no any base lvalue specified.
3486 // TODO: Support TBAA for member arrays.
3487 QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
3488 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
3489 if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
3490
3491 return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
3492}
3493
3494/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3495/// array to pointer, return the array subexpression.
3496static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
3497 // If this isn't just an array->pointer decay, bail out.
3498 const auto *CE = dyn_cast<CastExpr>(E);
3499 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
3500 return nullptr;
3501
3502 // If this is a decay from variable width array, bail out.
3503 const Expr *SubExpr = CE->getSubExpr();
3504 if (SubExpr->getType()->isVariableArrayType())
3505 return nullptr;
3506
3507 return SubExpr;
3508}
3509
3510static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
3511 llvm::Value *ptr,
3512 ArrayRef<llvm::Value*> indices,
3513 bool inbounds,
3514 bool signedIndices,
3515 SourceLocation loc,
3516 const llvm::Twine &name = "arrayidx") {
3517 if (inbounds) {
3518 return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
3519 CodeGenFunction::NotSubtraction, loc,
3520 name);
3521 } else {
3522 return CGF.Builder.CreateGEP(ptr, indices, name);
3523 }
3524}
3525
3526static CharUnits getArrayElementAlign(CharUnits arrayAlign,
3527 llvm::Value *idx,
3528 CharUnits eltSize) {
3529 // If we have a constant index, we can use the exact offset of the
3530 // element we're accessing.
3531 if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
3532 CharUnits offset = constantIdx->getZExtValue() * eltSize;
3533 return arrayAlign.alignmentAtOffset(offset);
3534
3535 // Otherwise, use the worst-case alignment for any element.
3536 } else {
3537 return arrayAlign.alignmentOfArrayElement(eltSize);
3538 }
3539}
3540
3541static QualType getFixedSizeElementType(const ASTContext &ctx,
3542 const VariableArrayType *vla) {
3543 QualType eltType;
3544 do {
3545 eltType = vla->getElementType();
3546 } while ((vla = ctx.getAsVariableArrayType(eltType)));
3547 return eltType;
3548}
3549
3550/// Given an array base, check whether its member access belongs to a record
3551/// with preserve_access_index attribute or not.
3552static bool IsPreserveAIArrayBase(CodeGenFunction &CGF, const Expr *ArrayBase) {
3553 if (!ArrayBase || !CGF.getDebugInfo())
3554 return false;
3555
3556 // Only support base as either a MemberExpr or DeclRefExpr.
3557 // DeclRefExpr to cover cases like:
3558 // struct s { int a; int b[10]; };
3559 // struct s *p;
3560 // p[1].a
3561 // p[1] will generate a DeclRefExpr and p[1].a is a MemberExpr.
3562 // p->b[5] is a MemberExpr example.
3563 const Expr *E = ArrayBase->IgnoreImpCasts();
3564 if (const auto *ME = dyn_cast<MemberExpr>(E))
3565 return ME->getMemberDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
3566
3567 if (const auto *DRE = dyn_cast<DeclRefExpr>(E)) {
3568 const auto *VarDef = dyn_cast<VarDecl>(DRE->getDecl());
3569 if (!VarDef)
3570 return false;
3571
3572 const auto *PtrT = VarDef->getType()->getAs<PointerType>();
3573 if (!PtrT)
3574 return false;
3575
3576 const auto *PointeeT = PtrT->getPointeeType()
3577 ->getUnqualifiedDesugaredType();
3578 if (const auto *RecT = dyn_cast<RecordType>(PointeeT))
3579 return RecT->getDecl()->hasAttr<BPFPreserveAccessIndexAttr>();
3580 return false;
3581 }
3582
3583 return false;
3584}
3585
3586static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
3587 ArrayRef<llvm::Value *> indices,
3588 QualType eltType, bool inbounds,
3589 bool signedIndices, SourceLocation loc,
3590 QualType *arrayType = nullptr,
3591 const Expr *Base = nullptr,
3592 const llvm::Twine &name = "arrayidx") {
3593 // All the indices except that last must be zero.
3594#ifndef NDEBUG
3595 for (auto idx : indices.drop_back())
3596 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3597, __PRETTY_FUNCTION__))
3597 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3597, __PRETTY_FUNCTION__))
;
3598#endif
3599
3600 // Determine the element size of the statically-sized base. This is
3601 // the thing that the indices are expressed in terms of.
3602 if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
3603 eltType = getFixedSizeElementType(CGF.getContext(), vla);
3604 }
3605
3606 // We can use that to compute the best alignment of the element.
3607 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
3608 CharUnits eltAlign =
3609 getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
3610
3611 llvm::Value *eltPtr;
3612 auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
3613 if (!LastIndex ||
3614 (!CGF.IsInPreservedAIRegion && !IsPreserveAIArrayBase(CGF, Base))) {
3615 eltPtr = emitArraySubscriptGEP(
3616 CGF, addr.getPointer(), indices, inbounds, signedIndices,
3617 loc, name);
3618 } else {
3619 // Remember the original array subscript for bpf target
3620 unsigned idx = LastIndex->getZExtValue();
3621 llvm::DIType *DbgInfo = nullptr;
3622 if (arrayType)
3623 DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(*arrayType, loc);
3624 eltPtr = CGF.Builder.CreatePreserveArrayAccessIndex(addr.getElementType(),
3625 addr.getPointer(),
3626 indices.size() - 1,
3627 idx, DbgInfo);
3628 }
3629
3630 return Address(eltPtr, eltAlign);
3631}
3632
3633LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3634 bool Accessed) {
3635 // The index must always be an integer, which is not an aggregate. Emit it
3636 // in lexical order (this complexity is, sadly, required by C++17).
3637 llvm::Value *IdxPre =
3638 (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
3639 bool SignedIndices = false;
3640 auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
3641 auto *Idx = IdxPre;
3642 if (E->getLHS() != E->getIdx()) {
3643 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3643, __PRETTY_FUNCTION__))
;
3644 Idx = EmitScalarExpr(E->getIdx());
3645 }
3646
3647 QualType IdxTy = E->getIdx()->getType();
3648 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
3649 SignedIndices |= IdxSigned;
3650
3651 if (SanOpts.has(SanitizerKind::ArrayBounds))
3652 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
3653
3654 // Extend or truncate the index type to 32 or 64-bits.
3655 if (Promote && Idx->getType() != IntPtrTy)
3656 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
3657
3658 return Idx;
3659 };
3660 IdxPre = nullptr;
3661
3662 // If the base is a vector type, then we are forming a vector element lvalue
3663 // with this subscript.
3664 if (E->getBase()->getType()->isVectorType() &&
3665 !isa<ExtVectorElementExpr>(E->getBase())) {
3666 // Emit the vector as an lvalue to get its address.
3667 LValue LHS = EmitLValue(E->getBase());
3668 auto *Idx = EmitIdxAfterBase(/*Promote*/false);
3669 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3669, __PRETTY_FUNCTION__))
;
3670 return LValue::MakeVectorElt(LHS.getAddress(*this), Idx,
3671 E->getBase()->getType(), LHS.getBaseInfo(),
3672 TBAAAccessInfo());
3673 }
3674
3675 // All the other cases basically behave like simple offsetting.
3676
3677 // Handle the extvector case we ignored above.
3678 if (isa<ExtVectorElementExpr>(E->getBase())) {
3679 LValue LV = EmitLValue(E->getBase());
3680 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3681 Address Addr = EmitExtVectorElementLValue(LV);
3682
3683 QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
3684 Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
3685 SignedIndices, E->getExprLoc());
3686 return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
3687 CGM.getTBAAInfoForSubobject(LV, EltType));
3688 }
3689
3690 LValueBaseInfo EltBaseInfo;
3691 TBAAAccessInfo EltTBAAInfo;
3692 Address Addr = Address::invalid();
3693 if (const VariableArrayType *vla =
3694 getContext().getAsVariableArrayType(E->getType())) {
3695 // The base must be a pointer, which is not an aggregate. Emit
3696 // it. It needs to be emitted first in case it's what captures
3697 // the VLA bounds.
3698 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3699 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3700
3701 // The element count here is the total number of non-VLA elements.
3702 llvm::Value *numElements = getVLASize(vla).NumElts;
3703
3704 // Effectively, the multiply by the VLA size is part of the GEP.
3705 // GEP indexes are signed, and scaling an index isn't permitted to
3706 // signed-overflow, so we use the same semantics for our explicit
3707 // multiply. We suppress this if overflow is not undefined behavior.
3708 if (getLangOpts().isSignedOverflowDefined()) {
3709 Idx = Builder.CreateMul(Idx, numElements);
3710 } else {
3711 Idx = Builder.CreateNSWMul(Idx, numElements);
3712 }
3713
3714 Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
3715 !getLangOpts().isSignedOverflowDefined(),
3716 SignedIndices, E->getExprLoc());
3717
3718 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
3719 // Indexing over an interface, as in "NSString *P; P[4];"
3720
3721 // Emit the base pointer.
3722 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3723 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3724
3725 CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
3726 llvm::Value *InterfaceSizeVal =
3727 llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
3728
3729 llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
3730
3731 // We don't necessarily build correct LLVM struct types for ObjC
3732 // interfaces, so we can't rely on GEP to do this scaling
3733 // correctly, so we need to cast to i8*. FIXME: is this actually
3734 // true? A lot of other things in the fragile ABI would break...
3735 llvm::Type *OrigBaseTy = Addr.getType();
3736 Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
3737
3738 // Do the GEP.
3739 CharUnits EltAlign =
3740 getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
3741 llvm::Value *EltPtr =
3742 emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
3743 SignedIndices, E->getExprLoc());
3744 Addr = Address(EltPtr, EltAlign);
3745
3746 // Cast back.
3747 Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
3748 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3749 // If this is A[i] where A is an array, the frontend will have decayed the
3750 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3751 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3752 // "gep x, i" here. Emit one "gep A, 0, i".
3753 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3754, __PRETTY_FUNCTION__))
3754 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3754, __PRETTY_FUNCTION__))
;
3755 LValue ArrayLV;
3756 // For simple multidimensional array indexing, set the 'accessed' flag for
3757 // better bounds-checking of the base expression.
3758 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3759 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3760 else
3761 ArrayLV = EmitLValue(Array);
3762 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3763
3764 // Propagate the alignment from the array itself to the result.
3765 QualType arrayType = Array->getType();
3766 Addr = emitArraySubscriptGEP(
3767 *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
3768 E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
3769 E->getExprLoc(), &arrayType, E->getBase());
3770 EltBaseInfo = ArrayLV.getBaseInfo();
3771 EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
3772 } else {
3773 // The base must be a pointer; emit it with an estimate of its alignment.
3774 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3775 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3776 QualType ptrType = E->getBase()->getType();
3777 Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
3778 !getLangOpts().isSignedOverflowDefined(),
3779 SignedIndices, E->getExprLoc(), &ptrType,
3780 E->getBase());
3781 }
3782
3783 LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
3784
3785 if (getLangOpts().ObjC &&
3786 getLangOpts().getGC() != LangOptions::NonGC) {
3787 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
3788 setObjCGCLValueClass(getContext(), E, LV);
3789 }
3790 return LV;
3791}
3792
3793LValue CodeGenFunction::EmitMatrixSubscriptExpr(const MatrixSubscriptExpr *E) {
3794 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3796, __PRETTY_FUNCTION__))
17
Assuming the condition is true
18
'?' condition is true
3795 !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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3796, __PRETTY_FUNCTION__))
3796 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3796, __PRETTY_FUNCTION__))
;
3797 LValue Base = EmitLValue(E->getBase());
3798 llvm::Value *RowIdx = EmitScalarExpr(E->getRowIdx());
3799 llvm::Value *ColIdx = EmitScalarExpr(E->getColumnIdx());
3800 llvm::Value *NumRows = Builder.getIntN(
3801 RowIdx->getType()->getScalarSizeInBits(),
3802 E->getBase()->getType()->getAs<ConstantMatrixType>()->getNumRows());
19
Assuming the object is not a 'ConstantMatrixType'
20
Called C++ object pointer is null
3803 llvm::Value *FinalIdx =
3804 Builder.CreateAdd(Builder.CreateMul(ColIdx, NumRows), RowIdx);
3805 return LValue::MakeMatrixElt(
3806 MaybeConvertMatrixAddress(Base.getAddress(*this), *this), FinalIdx,
3807 E->getBase()->getType(), Base.getBaseInfo(), TBAAAccessInfo());
3808}
3809
3810static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
3811 LValueBaseInfo &BaseInfo,
3812 TBAAAccessInfo &TBAAInfo,
3813 QualType BaseTy, QualType ElTy,
3814 bool IsLowerBound) {
3815 LValue BaseLVal;
3816 if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
3817 BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
3818 if (BaseTy->isArrayType()) {
3819 Address Addr = BaseLVal.getAddress(CGF);
3820 BaseInfo = BaseLVal.getBaseInfo();
3821
3822 // If the array type was an incomplete type, we need to make sure
3823 // the decay ends up being the right type.
3824 llvm::Type *NewTy = CGF.ConvertType(BaseTy);
3825 Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
3826
3827 // Note that VLA pointers are always decayed, so we don't need to do
3828 // anything here.
3829 if (!BaseTy->isVariableArrayType()) {
3830 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3831, __PRETTY_FUNCTION__))
3831 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3831, __PRETTY_FUNCTION__))
;
3832 Addr = CGF.Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3833 }
3834
3835 return CGF.Builder.CreateElementBitCast(Addr,
3836 CGF.ConvertTypeForMem(ElTy));
3837 }
3838 LValueBaseInfo TypeBaseInfo;
3839 TBAAAccessInfo TypeTBAAInfo;
3840 CharUnits Align =
3841 CGF.CGM.getNaturalTypeAlignment(ElTy, &TypeBaseInfo, &TypeTBAAInfo);
3842 BaseInfo.mergeForCast(TypeBaseInfo);
3843 TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
3844 return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress(CGF)), Align);
3845 }
3846 return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3847}
3848
3849LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3850 bool IsLowerBound) {
3851 QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
3852 QualType ResultExprTy;
3853 if (auto *AT = getContext().getAsArrayType(BaseTy))
3854 ResultExprTy = AT->getElementType();
3855 else
3856 ResultExprTy = BaseTy->getPointeeType();
3857 llvm::Value *Idx = nullptr;
3858 if (IsLowerBound || E->getColonLocFirst().isInvalid()) {
3859 // Requesting lower bound or upper bound, but without provided length and
3860 // without ':' symbol for the default length -> length = 1.
3861 // Idx = LowerBound ?: 0;
3862 if (auto *LowerBound = E->getLowerBound()) {
3863 Idx = Builder.CreateIntCast(
3864 EmitScalarExpr(LowerBound), IntPtrTy,
3865 LowerBound->getType()->hasSignedIntegerRepresentation());
3866 } else
3867 Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
3868 } else {
3869 // Try to emit length or lower bound as constant. If this is possible, 1
3870 // is subtracted from constant length or lower bound. Otherwise, emit LLVM
3871 // IR (LB + Len) - 1.
3872 auto &C = CGM.getContext();
3873 auto *Length = E->getLength();
3874 llvm::APSInt ConstLength;
3875 if (Length) {
3876 // Idx = LowerBound + Length - 1;
3877 if (Optional<llvm::APSInt> CL = Length->getIntegerConstantExpr(C)) {
3878 ConstLength = CL->zextOrTrunc(PointerWidthInBits);
3879 Length = nullptr;
3880 }
3881 auto *LowerBound = E->getLowerBound();
3882 llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
3883 if (LowerBound) {
3884 if (Optional<llvm::APSInt> LB = LowerBound->getIntegerConstantExpr(C)) {
3885 ConstLowerBound = LB->zextOrTrunc(PointerWidthInBits);
3886 LowerBound = nullptr;
3887 }
3888 }
3889 if (!Length)
3890 --ConstLength;
3891 else if (!LowerBound)
3892 --ConstLowerBound;
3893
3894 if (Length || LowerBound) {
3895 auto *LowerBoundVal =
3896 LowerBound
3897 ? Builder.CreateIntCast(
3898 EmitScalarExpr(LowerBound), IntPtrTy,
3899 LowerBound->getType()->hasSignedIntegerRepresentation())
3900 : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
3901 auto *LengthVal =
3902 Length
3903 ? Builder.CreateIntCast(
3904 EmitScalarExpr(Length), IntPtrTy,
3905 Length->getType()->hasSignedIntegerRepresentation())
3906 : llvm::ConstantInt::get(IntPtrTy, ConstLength);
3907 Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
3908 /*HasNUW=*/false,
3909 !getLangOpts().isSignedOverflowDefined());
3910 if (Length && LowerBound) {
3911 Idx = Builder.CreateSub(
3912 Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
3913 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3914 }
3915 } else
3916 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
3917 } else {
3918 // Idx = ArraySize - 1;
3919 QualType ArrayTy = BaseTy->isPointerType()
3920 ? E->getBase()->IgnoreParenImpCasts()->getType()
3921 : BaseTy;
3922 if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
3923 Length = VAT->getSizeExpr();
3924 if (Optional<llvm::APSInt> L = Length->getIntegerConstantExpr(C)) {
3925 ConstLength = *L;
3926 Length = nullptr;
3927 }
3928 } else {
3929 auto *CAT = C.getAsConstantArrayType(ArrayTy);
3930 ConstLength = CAT->getSize();
3931 }
3932 if (Length) {
3933 auto *LengthVal = Builder.CreateIntCast(
3934 EmitScalarExpr(Length), IntPtrTy,
3935 Length->getType()->hasSignedIntegerRepresentation());
3936 Idx = Builder.CreateSub(
3937 LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
3938 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3939 } else {
3940 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3941 --ConstLength;
3942 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
3943 }
3944 }
3945 }
3946 assert(Idx)((Idx) ? static_cast<void> (0) : __assert_fail ("Idx", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3946, __PRETTY_FUNCTION__))
;
3947
3948 Address EltPtr = Address::invalid();
3949 LValueBaseInfo BaseInfo;
3950 TBAAAccessInfo TBAAInfo;
3951 if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
3952 // The base must be a pointer, which is not an aggregate. Emit
3953 // it. It needs to be emitted first in case it's what captures
3954 // the VLA bounds.
3955 Address Base =
3956 emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
3957 BaseTy, VLA->getElementType(), IsLowerBound);
3958 // The element count here is the total number of non-VLA elements.
3959 llvm::Value *NumElements = getVLASize(VLA).NumElts;
3960
3961 // Effectively, the multiply by the VLA size is part of the GEP.
3962 // GEP indexes are signed, and scaling an index isn't permitted to
3963 // signed-overflow, so we use the same semantics for our explicit
3964 // multiply. We suppress this if overflow is not undefined behavior.
3965 if (getLangOpts().isSignedOverflowDefined())
3966 Idx = Builder.CreateMul(Idx, NumElements);
3967 else
3968 Idx = Builder.CreateNSWMul(Idx, NumElements);
3969 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
3970 !getLangOpts().isSignedOverflowDefined(),
3971 /*signedIndices=*/false, E->getExprLoc());
3972 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3973 // If this is A[i] where A is an array, the frontend will have decayed the
3974 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3975 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3976 // "gep x, i" here. Emit one "gep A, 0, i".
3977 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3978, __PRETTY_FUNCTION__))
3978 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 3978, __PRETTY_FUNCTION__))
;
3979 LValue ArrayLV;
3980 // For simple multidimensional array indexing, set the 'accessed' flag for
3981 // better bounds-checking of the base expression.
3982 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3983 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3984 else
3985 ArrayLV = EmitLValue(Array);
3986
3987 // Propagate the alignment from the array itself to the result.
3988 EltPtr = emitArraySubscriptGEP(
3989 *this, ArrayLV.getAddress(*this), {CGM.getSize(CharUnits::Zero()), Idx},
3990 ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
3991 /*signedIndices=*/false, E->getExprLoc());
3992 BaseInfo = ArrayLV.getBaseInfo();
3993 TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
3994 } else {
3995 Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
3996 TBAAInfo, BaseTy, ResultExprTy,
3997 IsLowerBound);
3998 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
3999 !getLangOpts().isSignedOverflowDefined(),
4000 /*signedIndices=*/false, E->getExprLoc());
4001 }
4002
4003 return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
4004}
4005
4006LValue CodeGenFunction::
4007EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
4008 // Emit the base vector as an l-value.
4009 LValue Base;
4010
4011 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
4012 if (E->isArrow()) {
4013 // If it is a pointer to a vector, emit the address and form an lvalue with
4014 // it.
4015 LValueBaseInfo BaseInfo;
4016 TBAAAccessInfo TBAAInfo;
4017 Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
4018 const auto *PT = E->getBase()->getType()->castAs<PointerType>();
4019 Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
4020 Base.getQuals().removeObjCGCAttr();
4021 } else if (E->getBase()->isGLValue()) {
4022 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
4023 // emit the base as an lvalue.
4024 assert(E->getBase()->getType()->isVectorType())((E->getBase()->getType()->isVectorType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4024, __PRETTY_FUNCTION__))
;
4025 Base = EmitLValue(E->getBase());
4026 } else {
4027 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
4028 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4029, __PRETTY_FUNCTION__))
4029 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4029, __PRETTY_FUNCTION__))
;
4030 llvm::Value *Vec = EmitScalarExpr(E->getBase());
4031
4032 // Store the vector to memory (because LValue wants an address).
4033 Address VecMem = CreateMemTemp(E->getBase()->getType());
4034 Builder.CreateStore(Vec, VecMem);
4035 Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
4036 AlignmentSource::Decl);
4037 }
4038
4039 QualType type =
4040 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
4041
4042 // Encode the element access list into a vector of unsigned indices.
4043 SmallVector<uint32_t, 4> Indices;
4044 E->getEncodedElementAccess(Indices);
4045
4046 if (Base.isSimple()) {
4047 llvm::Constant *CV =
4048 llvm::ConstantDataVector::get(getLLVMContext(), Indices);
4049 return LValue::MakeExtVectorElt(Base.getAddress(*this), CV, type,
4050 Base.getBaseInfo(), TBAAAccessInfo());
4051 }
4052 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4052, __PRETTY_FUNCTION__))
;
4053
4054 llvm::Constant *BaseElts = Base.getExtVectorElts();
4055 SmallVector<llvm::Constant *, 4> CElts;
4056
4057 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
4058 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
4059 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
4060 return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
4061 Base.getBaseInfo(), TBAAAccessInfo());
4062}
4063
4064LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
4065 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
4066 EmitIgnoredExpr(E->getBase());
4067 return EmitDeclRefLValue(DRE);
4068 }
4069
4070 Expr *BaseExpr = E->getBase();
4071 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
4072 LValue BaseLV;
4073 if (E->isArrow()) {
4074 LValueBaseInfo BaseInfo;
4075 TBAAAccessInfo TBAAInfo;
4076 Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
4077 QualType PtrTy = BaseExpr->getType()->getPointeeType();
4078 SanitizerSet SkippedChecks;
4079 bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
4080 if (IsBaseCXXThis)
4081 SkippedChecks.set(SanitizerKind::Alignment, true);
4082 if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
4083 SkippedChecks.set(SanitizerKind::Null, true);
4084 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
4085 /*Alignment=*/CharUnits::Zero(), SkippedChecks);
4086 BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
4087 } else
4088 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
4089
4090 NamedDecl *ND = E->getMemberDecl();
4091 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
4092 LValue LV = EmitLValueForField(BaseLV, Field);
4093 setObjCGCLValueClass(getContext(), E, LV);
4094 if (getLangOpts().OpenMP) {
4095 // If the member was explicitly marked as nontemporal, mark it as
4096 // nontemporal. If the base lvalue is marked as nontemporal, mark access
4097 // to children as nontemporal too.
4098 if ((IsWrappedCXXThis(BaseExpr) &&
4099 CGM.getOpenMPRuntime().isNontemporalDecl(Field)) ||
4100 BaseLV.isNontemporal())
4101 LV.setNontemporal(/*Value=*/true);
4102 }
4103 return LV;
4104 }
4105
4106 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
4107 return EmitFunctionDeclLValue(*this, E, FD);
4108
4109 llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4109)
;
4110}
4111
4112/// Given that we are currently emitting a lambda, emit an l-value for
4113/// one of its members.
4114LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
4115 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4115, __PRETTY_FUNCTION__))
;
4116 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4116, __PRETTY_FUNCTION__))
;
4117 QualType LambdaTagType =
4118 getContext().getTagDeclType(Field->getParent());
4119 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
4120 return EmitLValueForField(LambdaLV, Field);
4121}
4122
4123/// Get the field index in the debug info. The debug info structure/union
4124/// will ignore the unnamed bitfields.
4125unsigned CodeGenFunction::getDebugInfoFIndex(const RecordDecl *Rec,
4126 unsigned FieldIndex) {
4127 unsigned I = 0, Skipped = 0;
4128
4129 for (auto F : Rec->getDefinition()->fields()) {
4130 if (I == FieldIndex)
4131 break;
4132 if (F->isUnnamedBitfield())
4133 Skipped++;
4134 I++;
4135 }
4136
4137 return FieldIndex - Skipped;
4138}
4139
4140/// Get the address of a zero-sized field within a record. The resulting
4141/// address doesn't necessarily have the right type.
4142static Address emitAddrOfZeroSizeField(CodeGenFunction &CGF, Address Base,
4143 const FieldDecl *Field) {
4144 CharUnits Offset = CGF.getContext().toCharUnitsFromBits(
4145 CGF.getContext().getFieldOffset(Field));
4146 if (Offset.isZero())
4147 return Base;
4148 Base = CGF.Builder.CreateElementBitCast(Base, CGF.Int8Ty);
4149 return CGF.Builder.CreateConstInBoundsByteGEP(Base, Offset);
4150}
4151
4152/// Drill down to the storage of a field without walking into
4153/// reference types.
4154///
4155/// The resulting address doesn't necessarily have the right type.
4156static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
4157 const FieldDecl *field) {
4158 if (field->isZeroSize(CGF.getContext()))
4159 return emitAddrOfZeroSizeField(CGF, base, field);
4160
4161 const RecordDecl *rec = field->getParent();
4162
4163 unsigned idx =
4164 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
4165
4166 return CGF.Builder.CreateStructGEP(base, idx, field->getName());
4167}
4168
4169static Address emitPreserveStructAccess(CodeGenFunction &CGF, LValue base,
4170 Address addr, const FieldDecl *field) {
4171 const RecordDecl *rec = field->getParent();
4172 llvm::DIType *DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(
4173 base.getType(), rec->getLocation());
4174
4175 unsigned idx =
4176 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
4177
4178 return CGF.Builder.CreatePreserveStructAccessIndex(
4179 addr, idx, CGF.getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo);
4180}
4181
4182static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
4183 const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
4184 if (!RD)
4185 return false;
4186
4187 if (RD->isDynamicClass())
4188 return true;
4189
4190 for (const auto &Base : RD->bases())
4191 if (hasAnyVptr(Base.getType(), Context))
4192 return true;
4193
4194 for (const FieldDecl *Field : RD->fields())
4195 if (hasAnyVptr(Field->getType(), Context))
4196 return true;
4197
4198 return false;
4199}
4200
4201LValue CodeGenFunction::EmitLValueForField(LValue base,
4202 const FieldDecl *field) {
4203 LValueBaseInfo BaseInfo = base.getBaseInfo();
4204
4205 if (field->isBitField()) {
4206 const CGRecordLayout &RL =
4207 CGM.getTypes().getCGRecordLayout(field->getParent());
4208 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
4209 Address Addr = base.getAddress(*this);
4210 unsigned Idx = RL.getLLVMFieldNo(field);
4211 const RecordDecl *rec = field->getParent();
4212 if (!IsInPreservedAIRegion &&
4213 (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
4214 if (Idx != 0)
4215 // For structs, we GEP to the field that the record layout suggests.
4216 Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
4217 } else {
4218 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4219 getContext().getRecordType(rec), rec->getLocation());
4220 Addr = Builder.CreatePreserveStructAccessIndex(Addr, Idx,
4221 getDebugInfoFIndex(rec, field->getFieldIndex()),
4222 DbgInfo);
4223 }
4224
4225 // Get the access type.
4226 llvm::Type *FieldIntTy =
4227 llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
4228 if (Addr.getElementType() != FieldIntTy)
4229 Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
4230
4231 QualType fieldType =
4232 field->getType().withCVRQualifiers(base.getVRQualifiers());
4233 // TODO: Support TBAA for bit fields.
4234 LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
4235 return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
4236 TBAAAccessInfo());
4237 }
4238
4239 // Fields of may-alias structures are may-alias themselves.
4240 // FIXME: this should get propagated down through anonymous structs
4241 // and unions.
4242 QualType FieldType = field->getType();
4243 const RecordDecl *rec = field->getParent();
4244 AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
4245 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
4246 TBAAAccessInfo FieldTBAAInfo;
4247 if (base.getTBAAInfo().isMayAlias() ||
4248 rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
4249 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4250 } else if (rec->isUnion()) {
4251 // TODO: Support TBAA for unions.
4252 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4253 } else {
4254 // If no base type been assigned for the base access, then try to generate
4255 // one for this base lvalue.
4256 FieldTBAAInfo = base.getTBAAInfo();
4257 if (!FieldTBAAInfo.BaseType) {
4258 FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
4259 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4260, __PRETTY_FUNCTION__))
4260 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4260, __PRETTY_FUNCTION__))
;
4261 }
4262
4263 // Adjust offset to be relative to the base type.
4264 const ASTRecordLayout &Layout =
4265 getContext().getASTRecordLayout(field->getParent());
4266 unsigned CharWidth = getContext().getCharWidth();
4267 if (FieldTBAAInfo.BaseType)
4268 FieldTBAAInfo.Offset +=
4269 Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
4270
4271 // Update the final access type and size.
4272 FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
4273 FieldTBAAInfo.Size =
4274 getContext().getTypeSizeInChars(FieldType).getQuantity();
4275 }
4276
4277 Address addr = base.getAddress(*this);
4278 if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
4279 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4280 ClassDef->isDynamicClass()) {
4281 // Getting to any field of dynamic object requires stripping dynamic
4282 // information provided by invariant.group. This is because accessing
4283 // fields may leak the real address of dynamic object, which could result
4284 // in miscompilation when leaked pointer would be compared.
4285 auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
4286 addr = Address(stripped, addr.getAlignment());
4287 }
4288 }
4289
4290 unsigned RecordCVR = base.getVRQualifiers();
4291 if (rec->isUnion()) {
4292 // For unions, there is no pointer adjustment.
4293 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4294 hasAnyVptr(FieldType, getContext()))
4295 // Because unions can easily skip invariant.barriers, we need to add
4296 // a barrier every time CXXRecord field with vptr is referenced.
4297 addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
4298 addr.getAlignment());
4299
4300 if (IsInPreservedAIRegion ||
4301 (getDebugInfo() && rec->hasAttr<BPFPreserveAccessIndexAttr>())) {
4302 // Remember the original union field index
4303 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateStandaloneType(base.getType(),
4304 rec->getLocation());
4305 addr = Address(
4306 Builder.CreatePreserveUnionAccessIndex(
4307 addr.getPointer(), getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo),
4308 addr.getAlignment());
4309 }
4310
4311 if (FieldType->isReferenceType())
4312 addr = Builder.CreateElementBitCast(
4313 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4314 } else {
4315 if (!IsInPreservedAIRegion &&
4316 (!getDebugInfo() || !rec->hasAttr<BPFPreserveAccessIndexAttr>()))
4317 // For structs, we GEP to the field that the record layout suggests.
4318 addr = emitAddrOfFieldStorage(*this, addr, field);
4319 else
4320 // Remember the original struct field index
4321 addr = emitPreserveStructAccess(*this, base, addr, field);
4322 }
4323
4324 // If this is a reference field, load the reference right now.
4325 if (FieldType->isReferenceType()) {
4326 LValue RefLVal =
4327 MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4328 if (RecordCVR & Qualifiers::Volatile)
4329 RefLVal.getQuals().addVolatile();
4330 addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
4331
4332 // Qualifiers on the struct don't apply to the referencee.
4333 RecordCVR = 0;
4334 FieldType = FieldType->getPointeeType();
4335 }
4336
4337 // Make sure that the address is pointing to the right type. This is critical
4338 // for both unions and structs. A union needs a bitcast, a struct element
4339 // will need a bitcast if the LLVM type laid out doesn't match the desired
4340 // type.
4341 addr = Builder.CreateElementBitCast(
4342 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4343
4344 if (field->hasAttr<AnnotateAttr>())
4345 addr = EmitFieldAnnotations(field, addr);
4346
4347 LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4348 LV.getQuals().addCVRQualifiers(RecordCVR);
4349
4350 // __weak attribute on a field is ignored.
4351 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
4352 LV.getQuals().removeObjCGCAttr();
4353
4354 return LV;
4355}
4356
4357LValue
4358CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
4359 const FieldDecl *Field) {
4360 QualType FieldType = Field->getType();
4361
4362 if (!FieldType->isReferenceType())
4363 return EmitLValueForField(Base, Field);
4364
4365 Address V = emitAddrOfFieldStorage(*this, Base.getAddress(*this), Field);
4366
4367 // Make sure that the address is pointing to the right type.
4368 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
4369 V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
4370
4371 // TODO: Generate TBAA information that describes this access as a structure
4372 // member access and not just an access to an object of the field's type. This
4373 // should be similar to what we do in EmitLValueForField().
4374 LValueBaseInfo BaseInfo = Base.getBaseInfo();
4375 AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
4376 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
4377 return MakeAddrLValue(V, FieldType, FieldBaseInfo,
4378 CGM.getTBAAInfoForSubobject(Base, FieldType));
4379}
4380
4381LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
4382 if (E->isFileScope()) {
4383 ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
4384 return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
4385 }
4386 if (E->getType()->isVariablyModifiedType())
4387 // make sure to emit the VLA size.
4388 EmitVariablyModifiedType(E->getType());
4389
4390 Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
4391 const Expr *InitExpr = E->getInitializer();
4392 LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
4393
4394 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
4395 /*Init*/ true);
4396
4397 // Block-scope compound literals are destroyed at the end of the enclosing
4398 // scope in C.
4399 if (!getLangOpts().CPlusPlus)
4400 if (QualType::DestructionKind DtorKind = E->getType().isDestructedType())
4401 pushLifetimeExtendedDestroy(getCleanupKind(DtorKind), DeclPtr,
4402 E->getType(), getDestroyer(DtorKind),
4403 DtorKind & EHCleanup);
4404
4405 return Result;
4406}
4407
4408LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
4409 if (!E->isGLValue())
4410 // Initializing an aggregate temporary in C++11: T{...}.
4411 return EmitAggExprToLValue(E);
4412
4413 // An lvalue initializer list must be initializing a reference.
4414 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4414, __PRETTY_FUNCTION__))
;
4415 return EmitLValue(E->getInit(0));
4416}
4417
4418/// Emit the operand of a glvalue conditional operator. This is either a glvalue
4419/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
4420/// LValue is returned and the current block has been terminated.
4421static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
4422 const Expr *Operand) {
4423 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
4424 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
4425 return None;
4426 }
4427
4428 return CGF.EmitLValue(Operand);
4429}
4430
4431LValue CodeGenFunction::
4432EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
4433 if (!expr->isGLValue()) {
4434 // ?: here should be an aggregate.
4435 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4436, __PRETTY_FUNCTION__))
4436 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4436, __PRETTY_FUNCTION__))
;
4437 return EmitAggExprToLValue(expr);
4438 }
4439
4440 OpaqueValueMapping binding(*this, expr);
4441
4442 const Expr *condExpr = expr->getCond();
4443 bool CondExprBool;
4444 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
4445 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
4446 if (!CondExprBool) std::swap(live, dead);
4447
4448 if (!ContainsLabel(dead)) {
4449 // If the true case is live, we need to track its region.
4450 if (CondExprBool)
4451 incrementProfileCounter(expr);
4452 // If a throw expression we emit it and return an undefined lvalue
4453 // because it can't be used.
4454 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(live->IgnoreParens())) {
4455 EmitCXXThrowExpr(ThrowExpr);
4456 llvm::Type *Ty =
4457 llvm::PointerType::getUnqual(ConvertType(dead->getType()));
4458 return MakeAddrLValue(
4459 Address(llvm::UndefValue::get(Ty), CharUnits::One()),
4460 dead->getType());
4461 }
4462 return EmitLValue(live);
4463 }
4464 }
4465
4466 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
4467 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
4468 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
4469
4470 ConditionalEvaluation eval(*this);
4471 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
4472
4473 // Any temporaries created here are conditional.
4474 EmitBlock(lhsBlock);
4475 incrementProfileCounter(expr);
4476 eval.begin(*this);
4477 Optional<LValue> lhs =
4478 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
4479 eval.end(*this);
4480
4481 if (lhs && !lhs->isSimple())
4482 return EmitUnsupportedLValue(expr, "conditional operator");
4483
4484 lhsBlock = Builder.GetInsertBlock();
4485 if (lhs)
4486 Builder.CreateBr(contBlock);
4487
4488 // Any temporaries created here are conditional.
4489 EmitBlock(rhsBlock);
4490 eval.begin(*this);
4491 Optional<LValue> rhs =
4492 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
4493 eval.end(*this);
4494 if (rhs && !rhs->isSimple())
4495 return EmitUnsupportedLValue(expr, "conditional operator");
4496 rhsBlock = Builder.GetInsertBlock();
4497
4498 EmitBlock(contBlock);
4499
4500 if (lhs && rhs) {
4501 llvm::PHINode *phi =
4502 Builder.CreatePHI(lhs->getPointer(*this)->getType(), 2, "cond-lvalue");
4503 phi->addIncoming(lhs->getPointer(*this), lhsBlock);
4504 phi->addIncoming(rhs->getPointer(*this), rhsBlock);
4505 Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
4506 AlignmentSource alignSource =
4507 std::max(lhs->getBaseInfo().getAlignmentSource(),
4508 rhs->getBaseInfo().getAlignmentSource());
4509 TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
4510 lhs->getTBAAInfo(), rhs->getTBAAInfo());
4511 return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
4512 TBAAInfo);
4513 } else {
4514 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4515, __PRETTY_FUNCTION__))
4515 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4515, __PRETTY_FUNCTION__))
;
4516 return lhs ? *lhs : *rhs;
4517 }
4518}
4519
4520/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4521/// type. If the cast is to a reference, we can have the usual lvalue result,
4522/// otherwise if a cast is needed by the code generator in an lvalue context,
4523/// then it must mean that we need the address of an aggregate in order to
4524/// access one of its members. This can happen for all the reasons that casts
4525/// are permitted with aggregate result, including noop aggregate casts, and
4526/// cast from scalar to union.
4527LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
4528 switch (E->getCastKind()) {
4529 case CK_ToVoid:
4530 case CK_BitCast:
4531 case CK_LValueToRValueBitCast:
4532 case CK_ArrayToPointerDecay:
4533 case CK_FunctionToPointerDecay:
4534 case CK_NullToMemberPointer:
4535 case CK_NullToPointer:
4536 case CK_IntegralToPointer:
4537 case CK_PointerToIntegral:
4538 case CK_PointerToBoolean:
4539 case CK_VectorSplat:
4540 case CK_IntegralCast:
4541 case CK_BooleanToSignedIntegral:
4542 case CK_IntegralToBoolean:
4543 case CK_IntegralToFloating:
4544 case CK_FloatingToIntegral:
4545 case CK_FloatingToBoolean:
4546 case CK_FloatingCast:
4547 case CK_FloatingRealToComplex:
4548 case CK_FloatingComplexToReal:
4549 case CK_FloatingComplexToBoolean:
4550 case CK_FloatingComplexCast:
4551 case CK_FloatingComplexToIntegralComplex:
4552 case CK_IntegralRealToComplex:
4553 case CK_IntegralComplexToReal:
4554 case CK_IntegralComplexToBoolean:
4555 case CK_IntegralComplexCast:
4556 case CK_IntegralComplexToFloatingComplex:
4557 case CK_DerivedToBaseMemberPointer:
4558 case CK_BaseToDerivedMemberPointer:
4559 case CK_MemberPointerToBoolean:
4560 case CK_ReinterpretMemberPointer:
4561 case CK_AnyPointerToBlockPointerCast:
4562 case CK_ARCProduceObject:
4563 case CK_ARCConsumeObject:
4564 case CK_ARCReclaimReturnedObject:
4565 case CK_ARCExtendBlockObject:
4566 case CK_CopyAndAutoreleaseBlockObject:
4567 case CK_IntToOCLSampler:
4568 case CK_FixedPointCast:
4569 case CK_FixedPointToBoolean:
4570 case CK_FixedPointToIntegral:
4571 case CK_IntegralToFixedPoint:
4572 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
4573
4574 case CK_Dependent:
4575 llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4575)
;
4576
4577 case CK_BuiltinFnToFnPtr:
4578 llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4578)
;
4579
4580 // These are never l-values; just use the aggregate emission code.
4581 case CK_NonAtomicToAtomic:
4582 case CK_AtomicToNonAtomic:
4583 return EmitAggExprToLValue(E);
4584
4585 case CK_Dynamic: {
4586 LValue LV = EmitLValue(E->getSubExpr());
4587 Address V = LV.getAddress(*this);
4588 const auto *DCE = cast<CXXDynamicCastExpr>(E);
4589 return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
4590 }
4591
4592 case CK_ConstructorConversion:
4593 case CK_UserDefinedConversion:
4594 case CK_CPointerToObjCPointerCast:
4595 case CK_BlockPointerToObjCPointerCast:
4596 case CK_NoOp:
4597 case CK_LValueToRValue:
4598 return EmitLValue(E->getSubExpr());
4599
4600 case CK_UncheckedDerivedToBase:
4601 case CK_DerivedToBase: {
4602 const auto *DerivedClassTy =
4603 E->getSubExpr()->getType()->castAs<RecordType>();
4604 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4605
4606 LValue LV = EmitLValue(E->getSubExpr());
4607 Address This = LV.getAddress(*this);
4608
4609 // Perform the derived-to-base conversion
4610 Address Base = GetAddressOfBaseClass(
4611 This, DerivedClassDecl, E->path_begin(), E->path_end(),
4612 /*NullCheckValue=*/false, E->getExprLoc());
4613
4614 // TODO: Support accesses to members of base classes in TBAA. For now, we
4615 // conservatively pretend that the complete object is of the base class
4616 // type.
4617 return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
4618 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4619 }
4620 case CK_ToUnion:
4621 return EmitAggExprToLValue(E);
4622 case CK_BaseToDerived: {
4623 const auto *DerivedClassTy = E->getType()->castAs<RecordType>();
4624 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4625
4626 LValue LV = EmitLValue(E->getSubExpr());
4627
4628 // Perform the base-to-derived conversion
4629 Address Derived = GetAddressOfDerivedClass(
4630 LV.getAddress(*this), DerivedClassDecl, E->path_begin(), E->path_end(),
4631 /*NullCheckValue=*/false);
4632
4633 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
4634 // performed and the object is not of the derived type.
4635 if (sanitizePerformTypeCheck())
4636 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
4637 Derived.getPointer(), E->getType());
4638
4639 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
4640 EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
4641 /*MayBeNull=*/false, CFITCK_DerivedCast,
4642 E->getBeginLoc());
4643
4644 return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
4645 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4646 }
4647 case CK_LValueBitCast: {
4648 // This must be a reinterpret_cast (or c-style equivalent).
4649 const auto *CE = cast<ExplicitCastExpr>(E);
4650
4651 CGM.EmitExplicitCastExprType(CE, this);
4652 LValue LV = EmitLValue(E->getSubExpr());
4653 Address V = Builder.CreateBitCast(LV.getAddress(*this),
4654 ConvertType(CE->getTypeAsWritten()));
4655
4656 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
4657 EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
4658 /*MayBeNull=*/false, CFITCK_UnrelatedCast,
4659 E->getBeginLoc());
4660
4661 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4662 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4663 }
4664 case CK_AddressSpaceConversion: {
4665 LValue LV = EmitLValue(E->getSubExpr());
4666 QualType DestTy = getContext().getPointerType(E->getType());
4667 llvm::Value *V = getTargetHooks().performAddrSpaceCast(
4668 *this, LV.getPointer(*this),
4669 E->getSubExpr()->getType().getAddressSpace(),
4670 E->getType().getAddressSpace(), ConvertType(DestTy));
4671 return MakeAddrLValue(Address(V, LV.getAddress(*this).getAlignment()),
4672 E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
4673 }
4674 case CK_ObjCObjectLValueCast: {
4675 LValue LV = EmitLValue(E->getSubExpr());
4676 Address V = Builder.CreateElementBitCast(LV.getAddress(*this),
4677 ConvertType(E->getType()));
4678 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4679 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4680 }
4681 case CK_ZeroToOCLOpaqueType:
4682 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4682)
;
4683 }
4684
4685 llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4685)
;
4686}
4687
4688LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
4689 assert(OpaqueValueMappingData::shouldBindAsLValue(e))((OpaqueValueMappingData::shouldBindAsLValue(e)) ? static_cast
<void> (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4689, __PRETTY_FUNCTION__))
;
4690 return getOrCreateOpaqueLValueMapping(e);
4691}
4692
4693LValue
4694CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
4695 assert(OpaqueValueMapping::shouldBindAsLValue(e))((OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4695, __PRETTY_FUNCTION__))
;
4696
4697 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
4698 it = OpaqueLValues.find(e);
4699
4700 if (it != OpaqueLValues.end())
4701 return it->second;
4702
4703 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4703, __PRETTY_FUNCTION__))
;
4704 return EmitLValue(e->getSourceExpr());
4705}
4706
4707RValue
4708CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
4709 assert(!OpaqueValueMapping::shouldBindAsLValue(e))((!OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4709, __PRETTY_FUNCTION__))
;
4710
4711 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
4712 it = OpaqueRValues.find(e);
4713
4714 if (it != OpaqueRValues.end())
4715 return it->second;
4716
4717 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4717, __PRETTY_FUNCTION__))
;
4718 return EmitAnyExpr(e->getSourceExpr());
4719}
4720
4721RValue CodeGenFunction::EmitRValueForField(LValue LV,
4722 const FieldDecl *FD,
4723 SourceLocation Loc) {
4724 QualType FT = FD->getType();
4725 LValue FieldLV = EmitLValueForField(LV, FD);
4726 switch (getEvaluationKind(FT)) {
4727 case TEK_Complex:
4728 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
4729 case TEK_Aggregate:
4730 return FieldLV.asAggregateRValue(*this);
4731 case TEK_Scalar:
4732 // This routine is used to load fields one-by-one to perform a copy, so
4733 // don't load reference fields.
4734 if (FD->getType()->isReferenceType())
4735 return RValue::get(FieldLV.getPointer(*this));
4736 // Call EmitLoadOfScalar except when the lvalue is a bitfield to emit a
4737 // primitive load.
4738 if (FieldLV.isBitField())
4739 return EmitLoadOfLValue(FieldLV, Loc);
4740 return RValue::get(EmitLoadOfScalar(FieldLV, Loc));
4741 }
4742 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4742)
;
4743}
4744
4745//===--------------------------------------------------------------------===//
4746// Expression Emission
4747//===--------------------------------------------------------------------===//
4748
4749RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
4750 ReturnValueSlot ReturnValue) {
4751 // Builtins never have block type.
4752 if (E->getCallee()->getType()->isBlockPointerType())
4753 return EmitBlockCallExpr(E, ReturnValue);
4754
4755 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
4756 return EmitCXXMemberCallExpr(CE, ReturnValue);
4757
4758 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
4759 return EmitCUDAKernelCallExpr(CE, ReturnValue);
4760
4761 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
4762 if (const CXXMethodDecl *MD =
4763 dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
4764 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
4765
4766 CGCallee callee = EmitCallee(E->getCallee());
4767
4768 if (callee.isBuiltin()) {
4769 return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
4770 E, ReturnValue);
4771 }
4772
4773 if (callee.isPseudoDestructor()) {
4774 return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
4775 }
4776
4777 return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
4778}
4779
4780/// Emit a CallExpr without considering whether it might be a subclass.
4781RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
4782 ReturnValueSlot ReturnValue) {
4783 CGCallee Callee = EmitCallee(E->getCallee());
4784 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4785}
4786
4787static CGCallee EmitDirectCallee(CodeGenFunction &CGF, GlobalDecl GD) {
4788 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
4789
4790 if (auto builtinID = FD->getBuiltinID()) {
4791 // Replaceable builtin provide their own implementation of a builtin. Unless
4792 // we are in the builtin implementation itself, don't call the actual
4793 // builtin. If we are in the builtin implementation, avoid trivial infinite
4794 // recursion.
4795 if (!FD->isInlineBuiltinDeclaration() ||
4796 CGF.CurFn->getName() == FD->getName())
4797 return CGCallee::forBuiltin(builtinID, FD);
4798 }
4799
4800 llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, GD);
4801 return CGCallee::forDirect(calleePtr, GD);
4802}
4803
4804CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
4805 E = E->IgnoreParens();
4806
4807 // Look through function-to-pointer decay.
4808 if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
4809 if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
4810 ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
4811 return EmitCallee(ICE->getSubExpr());
4812 }
4813
4814 // Resolve direct calls.
4815 } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
4816 if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
4817 return EmitDirectCallee(*this, FD);
4818 }
4819 } else if (auto ME = dyn_cast<MemberExpr>(E)) {
4820 if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
4821 EmitIgnoredExpr(ME->getBase());
4822 return EmitDirectCallee(*this, FD);
4823 }
4824
4825 // Look through template substitutions.
4826 } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
4827 return EmitCallee(NTTP->getReplacement());
4828
4829 // Treat pseudo-destructor calls differently.
4830 } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
4831 return CGCallee::forPseudoDestructor(PDE);
4832 }
4833
4834 // Otherwise, we have an indirect reference.
4835 llvm::Value *calleePtr;
4836 QualType functionType;
4837 if (auto ptrType = E->getType()->getAs<PointerType>()) {
4838 calleePtr = EmitScalarExpr(E);
4839 functionType = ptrType->getPointeeType();
4840 } else {
4841 functionType = E->getType();
4842 calleePtr = EmitLValue(E).getPointer(*this);
4843 }
4844 assert(functionType->isFunctionType())((functionType->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("functionType->isFunctionType()", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4844, __PRETTY_FUNCTION__))
;
4845
4846 GlobalDecl GD;
4847 if (const auto *VD =
4848 dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
4849 GD = GlobalDecl(VD);
4850
4851 CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
4852 CGCallee callee(calleeInfo, calleePtr);
4853 return callee;
4854}
4855
4856LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
4857 // Comma expressions just emit their LHS then their RHS as an l-value.
4858 if (E->getOpcode() == BO_Comma) {
4859 EmitIgnoredExpr(E->getLHS());
4860 EnsureInsertPoint();
4861 return EmitLValue(E->getRHS());
4862 }
4863
4864 if (E->getOpcode() == BO_PtrMemD ||
4865 E->getOpcode() == BO_PtrMemI)
4866 return EmitPointerToDataMemberBinaryExpr(E);
4867
4868 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4868, __PRETTY_FUNCTION__))
;
4869
4870 // Note that in all of these cases, __block variables need the RHS
4871 // evaluated first just in case the variable gets moved by the RHS.
4872
4873 switch (getEvaluationKind(E->getType())) {
4874 case TEK_Scalar: {
4875 switch (E->getLHS()->getType().getObjCLifetime()) {
4876 case Qualifiers::OCL_Strong:
4877 return EmitARCStoreStrong(E, /*ignored*/ false).first;
4878
4879 case Qualifiers::OCL_Autoreleasing:
4880 return EmitARCStoreAutoreleasing(E).first;
4881
4882 // No reason to do any of these differently.
4883 case Qualifiers::OCL_None:
4884 case Qualifiers::OCL_ExplicitNone:
4885 case Qualifiers::OCL_Weak:
4886 break;
4887 }
4888
4889 RValue RV = EmitAnyExpr(E->getRHS());
4890 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
4891 if (RV.isScalar())
4892 EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
4893 EmitStoreThroughLValue(RV, LV);
4894 if (getLangOpts().OpenMP)
4895 CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
4896 E->getLHS());
4897 return LV;
4898 }
4899
4900 case TEK_Complex:
4901 return EmitComplexAssignmentLValue(E);
4902
4903 case TEK_Aggregate:
4904 return EmitAggExprToLValue(E);
4905 }
4906 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4906)
;
4907}
4908
4909LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
4910 RValue RV = EmitCallExpr(E);
4911
4912 if (!RV.isScalar())
4913 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4914 AlignmentSource::Decl);
4915
4916 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4918, __PRETTY_FUNCTION__))
4917 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4918, __PRETTY_FUNCTION__))
4918 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4918, __PRETTY_FUNCTION__))
;
4919
4920 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4921}
4922
4923LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
4924 // FIXME: This shouldn't require another copy.
4925 return EmitAggExprToLValue(E);
4926}
4927
4928LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
4929 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4930, __PRETTY_FUNCTION__))
4930 && "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4930, __PRETTY_FUNCTION__))
;
4931 AggValueSlot Slot = CreateAggTemp(E->getType());
4932 EmitCXXConstructExpr(E, Slot);
4933 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4934}
4935
4936LValue
4937CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
4938 return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4939}
4940
4941Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
4942 return Builder.CreateElementBitCast(CGM.GetAddrOfMSGuidDecl(E->getGuidDecl()),
4943 ConvertType(E->getType()));
4944}
4945
4946LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
4947 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
4948 AlignmentSource::Decl);
4949}
4950
4951LValue
4952CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
4953 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4954 Slot.setExternallyDestructed();
4955 EmitAggExpr(E->getSubExpr(), Slot);
4956 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
4957 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4958}
4959
4960LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
4961 RValue RV = EmitObjCMessageExpr(E);
4962
4963 if (!RV.isScalar())
4964 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4965 AlignmentSource::Decl);
4966
4967 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4969, __PRETTY_FUNCTION__))
4968 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4969, __PRETTY_FUNCTION__))
4969 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 4969, __PRETTY_FUNCTION__))
;
4970
4971 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4972}
4973
4974LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
4975 Address V =
4976 CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
4977 return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
4978}
4979
4980llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
4981 const ObjCIvarDecl *Ivar) {
4982 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
4983}
4984
4985LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
4986 llvm::Value *BaseValue,
4987 const ObjCIvarDecl *Ivar,
4988 unsigned CVRQualifiers) {
4989 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
4990 Ivar, CVRQualifiers);
4991}
4992
4993LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
4994 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
4995 llvm::Value *BaseValue = nullptr;
4996 const Expr *BaseExpr = E->getBase();
4997 Qualifiers BaseQuals;
4998 QualType ObjectTy;
4999 if (E->isArrow()) {
5000 BaseValue = EmitScalarExpr(BaseExpr);
5001 ObjectTy = BaseExpr->getType()->getPointeeType();
5002 BaseQuals = ObjectTy.getQualifiers();
5003 } else {
5004 LValue BaseLV = EmitLValue(BaseExpr);
5005 BaseValue = BaseLV.getPointer(*this);
5006 ObjectTy = BaseExpr->getType();
5007 BaseQuals = ObjectTy.getQualifiers();
5008 }
5009
5010 LValue LV =
5011 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
5012 BaseQuals.getCVRQualifiers());
5013 setObjCGCLValueClass(getContext(), E, LV);
5014 return LV;
5015}
5016
5017LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
5018 // Can only get l-value for message expression returning aggregate type
5019 RValue RV = EmitAnyExprToTemp(E);
5020 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
5021 AlignmentSource::Decl);
5022}
5023
5024RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
5025 const CallExpr *E, ReturnValueSlot ReturnValue,
5026 llvm::Value *Chain) {
5027 // Get the actual function type. The callee type will always be a pointer to
5028 // function type or a block pointer type.
5029 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5030, __PRETTY_FUNCTION__))
5030 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5030, __PRETTY_FUNCTION__))
;
5031
5032 const Decl *TargetDecl =
5033 OrigCallee.getAbstractInfo().getCalleeDecl().getDecl();
5034
5035 CalleeType = getContext().getCanonicalType(CalleeType);
5036
5037 auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
5038
5039 CGCallee Callee = OrigCallee;
5040
5041 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
5042 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
5043 if (llvm::Constant *PrefixSig =
5044 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
5045 SanitizerScope SanScope(this);
5046 // Remove any (C++17) exception specifications, to allow calling e.g. a
5047 // noexcept function through a non-noexcept pointer.
5048 auto ProtoTy =
5049 getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
5050 llvm::Constant *FTRTTIConst =
5051 CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
5052 llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
5053 llvm::StructType *PrefixStructTy = llvm::StructType::get(
5054 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
5055
5056 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5057
5058 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
5059 CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
5060 llvm::Value *CalleeSigPtr =
5061 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
5062 llvm::Value *CalleeSig =
5063 Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
5064 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
5065
5066 llvm::BasicBlock *Cont = createBasicBlock("cont");
5067 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
5068 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
5069
5070 EmitBlock(TypeCheck);
5071 llvm::Value *CalleeRTTIPtr =
5072 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
5073 llvm::Value *CalleeRTTIEncoded =
5074 Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
5075 llvm::Value *CalleeRTTI =
5076 DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
5077 llvm::Value *CalleeRTTIMatch =
5078 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
5079 llvm::Constant *StaticData[] = {EmitCheckSourceLocation(E->getBeginLoc()),
5080 EmitCheckTypeDescriptor(CalleeType)};
5081 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
5082 SanitizerHandler::FunctionTypeMismatch, StaticData,
5083 {CalleePtr, CalleeRTTI, FTRTTIConst});
5084
5085 Builder.CreateBr(Cont);
5086 EmitBlock(Cont);
5087 }
5088 }
5089
5090 const auto *FnType = cast<FunctionType>(PointeeType);
5091
5092 // If we are checking indirect calls and this call is indirect, check that the
5093 // function pointer is a member of the bit set for the function type.
5094 if (SanOpts.has(SanitizerKind::CFIICall) &&
5095 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
5096 SanitizerScope SanScope(this);
5097 EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
5098
5099 llvm::Metadata *MD;
5100 if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
5101 MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
5102 else
5103 MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
5104
5105 llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
5106
5107 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5108 llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
5109 llvm::Value *TypeTest = Builder.CreateCall(
5110 CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
5111
5112 auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
5113 llvm::Constant *StaticData[] = {
5114 llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
5115 EmitCheckSourceLocation(E->getBeginLoc()),
5116 EmitCheckTypeDescriptor(QualType(FnType, 0)),
5117 };
5118 if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
5119 EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
5120 CastedCallee, StaticData);
5121 } else {
5122 EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
5123 SanitizerHandler::CFICheckFail, StaticData,
5124 {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
5125 }
5126 }
5127
5128 CallArgList Args;
5129 if (Chain)
5130 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
5131 CGM.getContext().VoidPtrTy);
5132
5133 // C++17 requires that we evaluate arguments to a call using assignment syntax
5134 // right-to-left, and that we evaluate arguments to certain other operators
5135 // left-to-right. Note that we allow this to override the order dictated by
5136 // the calling convention on the MS ABI, which means that parameter
5137 // destruction order is not necessarily reverse construction order.
5138 // FIXME: Revisit this based on C++ committee response to unimplementability.
5139 EvaluationOrder Order = EvaluationOrder::Default;
5140 if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
5141 if (OCE->isAssignmentOp())
5142 Order = EvaluationOrder::ForceRightToLeft;
5143 else {
5144 switch (OCE->getOperator()) {
5145 case OO_LessLess:
5146 case OO_GreaterGreater:
5147 case OO_AmpAmp:
5148 case OO_PipePipe:
5149 case OO_Comma:
5150 case OO_ArrowStar:
5151 Order = EvaluationOrder::ForceLeftToRight;
5152 break;
5153 default:
5154 break;
5155 }
5156 }
5157 }
5158
5159 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
5160 E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
5161
5162 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
5163 Args, FnType, /*ChainCall=*/Chain);
5164
5165 // C99 6.5.2.2p6:
5166 // If the expression that denotes the called function has a type
5167 // that does not include a prototype, [the default argument
5168 // promotions are performed]. If the number of arguments does not
5169 // equal the number of parameters, the behavior is undefined. If
5170 // the function is defined with a type that includes a prototype,
5171 // and either the prototype ends with an ellipsis (, ...) or the
5172 // types of the arguments after promotion are not compatible with
5173 // the types of the parameters, the behavior is undefined. If the
5174 // function is defined with a type that does not include a
5175 // prototype, and the types of the arguments after promotion are
5176 // not compatible with those of the parameters after promotion,
5177 // the behavior is undefined [except in some trivial cases].
5178 // That is, in the general case, we should assume that a call
5179 // through an unprototyped function type works like a *non-variadic*
5180 // call. The way we make this work is to cast to the exact type
5181 // of the promoted arguments.
5182 //
5183 // Chain calls use this same code path to add the invisible chain parameter
5184 // to the function type.
5185 if (isa<FunctionNoProtoType>(FnType) || Chain) {
5186 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
5187 int AS = Callee.getFunctionPointer()->getType()->getPointerAddressSpace();
5188 CalleeTy = CalleeTy->getPointerTo(AS);
5189
5190 llvm::Value *CalleePtr = Callee.getFunctionPointer();
5191 CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
5192 Callee.setFunctionPointer(CalleePtr);
5193 }
5194
5195 llvm::CallBase *CallOrInvoke = nullptr;
5196 RValue Call = EmitCall(FnInfo, Callee, ReturnValue, Args, &CallOrInvoke,
5197 E->getExprLoc());
5198
5199 // Generate function declaration DISuprogram in order to be used
5200 // in debug info about call sites.
5201 if (CGDebugInfo *DI = getDebugInfo()) {
5202 if (auto *CalleeDecl = dyn_cast_or_null<FunctionDecl>(TargetDecl))
5203 DI->EmitFuncDeclForCallSite(CallOrInvoke, QualType(FnType, 0),
5204 CalleeDecl);
5205 }
5206
5207 return Call;
5208}
5209
5210LValue CodeGenFunction::
5211EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
5212 Address BaseAddr = Address::invalid();
5213 if (E->getOpcode() == BO_PtrMemI) {
5214 BaseAddr = EmitPointerWithAlignment(E->getLHS());
5215 } else {
5216 BaseAddr = EmitLValue(E->getLHS()).getAddress(*this);
5217 }
5218
5219 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
5220 const auto *MPT = E->getRHS()->getType()->castAs<MemberPointerType>();
5221
5222 LValueBaseInfo BaseInfo;
5223 TBAAAccessInfo TBAAInfo;
5224 Address MemberAddr =
5225 EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
5226 &TBAAInfo);
5227
5228 return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
5229}
5230
5231/// Given the address of a temporary variable, produce an r-value of
5232/// its type.
5233RValue CodeGenFunction::convertTempToRValue(Address addr,
5234 QualType type,
5235 SourceLocation loc) {
5236 LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
5237 switch (getEvaluationKind(type)) {
5238 case TEK_Complex:
5239 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
5240 case TEK_Aggregate:
5241 return lvalue.asAggregateRValue(*this);
5242 case TEK_Scalar:
5243 return RValue::get(EmitLoadOfScalar(lvalue, loc));
5244 }
5245 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5245)
;
5246}
5247
5248void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
5249 assert(Val->getType()->isFPOrFPVectorTy())((Val->getType()->isFPOrFPVectorTy()) ? static_cast<
void> (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-12~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5249, __PRETTY_FUNCTION__))
;
5250 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
5251 return;
5252
5253 llvm::MDBuilder MDHelper(getLLVMContext());
5254 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
5255
5256 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
5257}
5258
5259namespace {
5260 struct LValueOrRValue {
5261 LValue LV;
5262 RValue RV;
5263 };
5264}
5265
5266static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
5267 const PseudoObjectExpr *E,
5268 bool forLValue,
5269 AggValueSlot slot) {
5270 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
5271
5272 // Find the result expression, if any.
5273 const Expr *resultExpr = E->getResultExpr();
5274 LValueOrRValue result;
5275
5276 for (PseudoObjectExpr::const_semantics_iterator
3
Loop condition is true. Entering loop body
5277 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2
Assuming 'i' is not equal to 'e'
5278 const Expr *semantic = *i;
5279
5280 // If this semantic expression is an opaque value, bind it
5281 // to the result of its source expression.
5282 if (const auto *ov
4.1
'ov' is null
= dyn_cast<OpaqueValueExpr>(semantic)) {
4
Assuming 'semantic' is not a 'OpaqueValueExpr'
5
Taking false branch
5283 // Skip unique OVEs.
5284 if (ov->isUnique()) {
5285 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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5286, __PRETTY_FUNCTION__))
5286 "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~++20200926111128+c6c5629f2fb/clang/lib/CodeGen/CGExpr.cpp"
, 5286, __PRETTY_FUNCTION__))
;
5287 continue;
5288 }
5289
5290 // If this is the result expression, we may need to evaluate
5291 // directly into the slot.
5292 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
5293 OVMA opaqueData;
5294 if (ov == resultExpr && ov->isRValue() && !forLValue &&
5295 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
5296 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
5297 LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
5298 AlignmentSource::Decl);
5299 opaqueData = OVMA::bind(CGF, ov, LV);
5300 result.RV = slot.asRValue();
5301
5302 // Otherwise, emit as normal.
5303 } else {
5304 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
5305
5306 // If this is the result, also evaluate the result now.
5307 if (ov == resultExpr) {
5308 if (forLValue)
5309 result.LV = CGF.EmitLValue(ov);
5310 else
5311 result.RV = CGF.EmitAnyExpr(ov, slot);
5312 }
5313 }
5314
5315 opaques.push_back(opaqueData);
5316
5317 // Otherwise, if the expression is the result, evaluate it
5318 // and remember the result.
5319 } else if (semantic == resultExpr) {
6
Assuming 'semantic' is not equal to 'resultExpr'
7
Taking false branch
5320 if (forLValue)
5321 result.LV = CGF.EmitLValue(semantic);
5322 else
5323 result.RV = CGF.EmitAnyExpr(semantic, slot);
5324
5325 // Otherwise, evaluate the expression in an ignored context.
5326 } else {
5327 CGF.EmitIgnoredExpr(semantic);
8
Calling 'CodeGenFunction::EmitIgnoredExpr'
5328 }
5329 }
5330
5331 // Unbind all the opaques now.
5332 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
5333 opaques[i].unbind(CGF);
5334
5335 return result;
5336}
5337
5338RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
5339 AggValueSlot slot) {
5340 return emitPseudoObjectExpr(*this, E, false, slot).RV;
1
Calling 'emitPseudoObjectExpr'
5341}
5342
5343LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
5344 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
5345}