Bug Summary

File:clang/lib/CodeGen/CGExpr.cpp
Warning:line 3813, column 32
Called C++ object pointer is null

Annotated Source Code

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clang -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 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -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-10~+201911111502510600c19528f1809/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/build-llvm/include -I /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/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-10/lib/clang/10.0.0/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-10~+201911111502510600c19528f1809/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-12-11-181444-25759-1 -x c++ /build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/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 "llvm/ADT/Hashing.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/IR/DataLayout.h"
33#include "llvm/IR/Intrinsics.h"
34#include "llvm/IR/LLVMContext.h"
35#include "llvm/IR/MDBuilder.h"
36#include "llvm/Support/ConvertUTF.h"
37#include "llvm/Support/MathExtras.h"
38#include "llvm/Support/Path.h"
39#include "llvm/Transforms/Utils/SanitizerStats.h"
40
41#include <string>
42
43using namespace clang;
44using namespace CodeGen;
45
46//===--------------------------------------------------------------------===//
47// Miscellaneous Helper Methods
48//===--------------------------------------------------------------------===//
49
50llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
51 unsigned addressSpace =
52 cast<llvm::PointerType>(value->getType())->getAddressSpace();
53
54 llvm::PointerType *destType = Int8PtrTy;
55 if (addressSpace)
56 destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
57
58 if (value->getType() == destType) return value;
59 return Builder.CreateBitCast(value, destType);
60}
61
62/// CreateTempAlloca - This creates a alloca and inserts it into the entry
63/// block.
64Address CodeGenFunction::CreateTempAllocaWithoutCast(llvm::Type *Ty,
65 CharUnits Align,
66 const Twine &Name,
67 llvm::Value *ArraySize) {
68 auto Alloca = CreateTempAlloca(Ty, Name, ArraySize);
69 Alloca->setAlignment(Align.getAsAlign());
70 return Address(Alloca, Align);
71}
72
73/// CreateTempAlloca - This creates a alloca and inserts it into the entry
74/// block. The alloca is casted to default address space if necessary.
75Address CodeGenFunction::CreateTempAlloca(llvm::Type *Ty, CharUnits Align,
76 const Twine &Name,
77 llvm::Value *ArraySize,
78 Address *AllocaAddr) {
79 auto Alloca = CreateTempAllocaWithoutCast(Ty, Align, Name, ArraySize);
80 if (AllocaAddr)
81 *AllocaAddr = Alloca;
82 llvm::Value *V = Alloca.getPointer();
83 // Alloca always returns a pointer in alloca address space, which may
84 // be different from the type defined by the language. For example,
85 // in C++ the auto variables are in the default address space. Therefore
86 // cast alloca to the default address space when necessary.
87 if (getASTAllocaAddressSpace() != LangAS::Default) {
88 auto DestAddrSpace = getContext().getTargetAddressSpace(LangAS::Default);
89 llvm::IRBuilderBase::InsertPointGuard IPG(Builder);
90 // When ArraySize is nullptr, alloca is inserted at AllocaInsertPt,
91 // otherwise alloca is inserted at the current insertion point of the
92 // builder.
93 if (!ArraySize)
94 Builder.SetInsertPoint(AllocaInsertPt);
95 V = getTargetHooks().performAddrSpaceCast(
96 *this, V, getASTAllocaAddressSpace(), LangAS::Default,
97 Ty->getPointerTo(DestAddrSpace), /*non-null*/ true);
98 }
99
100 return Address(V, Align);
101}
102
103/// CreateTempAlloca - This creates an alloca and inserts it into the entry
104/// block if \p ArraySize is nullptr, otherwise inserts it at the current
105/// insertion point of the builder.
106llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
107 const Twine &Name,
108 llvm::Value *ArraySize) {
109 if (ArraySize)
110 return Builder.CreateAlloca(Ty, ArraySize, Name);
111 return new llvm::AllocaInst(Ty, CGM.getDataLayout().getAllocaAddrSpace(),
112 ArraySize, Name, AllocaInsertPt);
113}
114
115/// CreateDefaultAlignTempAlloca - This creates an alloca with the
116/// default alignment of the corresponding LLVM type, which is *not*
117/// guaranteed to be related in any way to the expected alignment of
118/// an AST type that might have been lowered to Ty.
119Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
120 const Twine &Name) {
121 CharUnits Align =
122 CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
123 return CreateTempAlloca(Ty, Align, Name);
124}
125
126void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
127 assert(isa<llvm::AllocaInst>(Var.getPointer()))((isa<llvm::AllocaInst>(Var.getPointer())) ? static_cast
<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Var.getPointer())"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 127, __PRETTY_FUNCTION__))
;
128 auto *Store = new llvm::StoreInst(Init, Var.getPointer());
129 Store->setAlignment(Var.getAlignment().getAsAlign());
130 llvm::BasicBlock *Block = AllocaInsertPt->getParent();
131 Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
132}
133
134Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
135 CharUnits Align = getContext().getTypeAlignInChars(Ty);
136 return CreateTempAlloca(ConvertType(Ty), Align, Name);
137}
138
139Address CodeGenFunction::CreateMemTemp(QualType Ty, const Twine &Name,
140 Address *Alloca) {
141 // FIXME: Should we prefer the preferred type alignment here?
142 return CreateMemTemp(Ty, getContext().getTypeAlignInChars(Ty), Name, Alloca);
143}
144
145Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
146 const Twine &Name, Address *Alloca) {
147 return CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name,
148 /*ArraySize=*/nullptr, Alloca);
149}
150
151Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty, CharUnits Align,
152 const Twine &Name) {
153 return CreateTempAllocaWithoutCast(ConvertTypeForMem(Ty), Align, Name);
154}
155
156Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty,
157 const Twine &Name) {
158 return CreateMemTempWithoutCast(Ty, getContext().getTypeAlignInChars(Ty),
159 Name);
160}
161
162/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
163/// expression and compare the result against zero, returning an Int1Ty value.
164llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
165 PGO.setCurrentStmt(E);
166 if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
167 llvm::Value *MemPtr = EmitScalarExpr(E);
168 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
169 }
170
171 QualType BoolTy = getContext().BoolTy;
172 SourceLocation Loc = E->getExprLoc();
173 if (!E->getType()->isAnyComplexType())
174 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
175
176 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
177 Loc);
178}
179
180/// EmitIgnoredExpr - Emit code to compute the specified expression,
181/// ignoring the result.
182void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
183 if (E->isRValue())
9
Taking false branch
184 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
185
186 // Just emit it as an l-value and drop the result.
187 EmitLValue(E);
10
Calling 'CodeGenFunction::EmitLValue'
188}
189
190/// EmitAnyExpr - Emit code to compute the specified expression which
191/// can have any type. The result is returned as an RValue struct.
192/// If this is an aggregate expression, AggSlot indicates where the
193/// result should be returned.
194RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
195 AggValueSlot aggSlot,
196 bool ignoreResult) {
197 switch (getEvaluationKind(E->getType())) {
198 case TEK_Scalar:
199 return RValue::get(EmitScalarExpr(E, ignoreResult));
200 case TEK_Complex:
201 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
202 case TEK_Aggregate:
203 if (!ignoreResult && aggSlot.isIgnored())
204 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
205 EmitAggExpr(E, aggSlot);
206 return aggSlot.asRValue();
207 }
208 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 208)
;
209}
210
211/// EmitAnyExprToTemp - Similar to EmitAnyExpr(), however, the result will
212/// always be accessible even if no aggregate location is provided.
213RValue CodeGenFunction::EmitAnyExprToTemp(const Expr *E) {
214 AggValueSlot AggSlot = AggValueSlot::ignored();
215
216 if (hasAggregateEvaluationKind(E->getType()))
217 AggSlot = CreateAggTemp(E->getType(), "agg.tmp");
218 return EmitAnyExpr(E, AggSlot);
219}
220
221/// EmitAnyExprToMem - Evaluate an expression into a given memory
222/// location.
223void CodeGenFunction::EmitAnyExprToMem(const Expr *E,
224 Address Location,
225 Qualifiers Quals,
226 bool IsInit) {
227 // FIXME: This function should take an LValue as an argument.
228 switch (getEvaluationKind(E->getType())) {
229 case TEK_Complex:
230 EmitComplexExprIntoLValue(E, MakeAddrLValue(Location, E->getType()),
231 /*isInit*/ false);
232 return;
233
234 case TEK_Aggregate: {
235 EmitAggExpr(E, AggValueSlot::forAddr(Location, Quals,
236 AggValueSlot::IsDestructed_t(IsInit),
237 AggValueSlot::DoesNotNeedGCBarriers,
238 AggValueSlot::IsAliased_t(!IsInit),
239 AggValueSlot::MayOverlap));
240 return;
241 }
242
243 case TEK_Scalar: {
244 RValue RV = RValue::get(EmitScalarExpr(E, /*Ignore*/ false));
245 LValue LV = MakeAddrLValue(Location, E->getType());
246 EmitStoreThroughLValue(RV, LV);
247 return;
248 }
249 }
250 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 250)
;
251}
252
253static void
254pushTemporaryCleanup(CodeGenFunction &CGF, const MaterializeTemporaryExpr *M,
255 const Expr *E, Address ReferenceTemporary) {
256 // Objective-C++ ARC:
257 // If we are binding a reference to a temporary that has ownership, we
258 // need to perform retain/release operations on the temporary.
259 //
260 // FIXME: This should be looking at E, not M.
261 if (auto Lifetime = M->getType().getObjCLifetime()) {
262 switch (Lifetime) {
263 case Qualifiers::OCL_None:
264 case Qualifiers::OCL_ExplicitNone:
265 // Carry on to normal cleanup handling.
266 break;
267
268 case Qualifiers::OCL_Autoreleasing:
269 // Nothing to do; cleaned up by an autorelease pool.
270 return;
271
272 case Qualifiers::OCL_Strong:
273 case Qualifiers::OCL_Weak:
274 switch (StorageDuration Duration = M->getStorageDuration()) {
275 case SD_Static:
276 // Note: we intentionally do not register a cleanup to release
277 // the object on program termination.
278 return;
279
280 case SD_Thread:
281 // FIXME: We should probably register a cleanup in this case.
282 return;
283
284 case SD_Automatic:
285 case SD_FullExpression:
286 CodeGenFunction::Destroyer *Destroy;
287 CleanupKind CleanupKind;
288 if (Lifetime == Qualifiers::OCL_Strong) {
289 const ValueDecl *VD = M->getExtendingDecl();
290 bool Precise =
291 VD && isa<VarDecl>(VD) && VD->hasAttr<ObjCPreciseLifetimeAttr>();
292 CleanupKind = CGF.getARCCleanupKind();
293 Destroy = Precise ? &CodeGenFunction::destroyARCStrongPrecise
294 : &CodeGenFunction::destroyARCStrongImprecise;
295 } else {
296 // __weak objects always get EH cleanups; otherwise, exceptions
297 // could cause really nasty crashes instead of mere leaks.
298 CleanupKind = NormalAndEHCleanup;
299 Destroy = &CodeGenFunction::destroyARCWeak;
300 }
301 if (Duration == SD_FullExpression)
302 CGF.pushDestroy(CleanupKind, ReferenceTemporary,
303 M->getType(), *Destroy,
304 CleanupKind & EHCleanup);
305 else
306 CGF.pushLifetimeExtendedDestroy(CleanupKind, ReferenceTemporary,
307 M->getType(),
308 *Destroy, CleanupKind & EHCleanup);
309 return;
310
311 case SD_Dynamic:
312 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 312)
;
313 }
314 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 314)
;
315 }
316 }
317
318 CXXDestructorDecl *ReferenceTemporaryDtor = nullptr;
319 if (const RecordType *RT =
320 E->getType()->getBaseElementTypeUnsafe()->getAs<RecordType>()) {
321 // Get the destructor for the reference temporary.
322 auto *ClassDecl = cast<CXXRecordDecl>(RT->getDecl());
323 if (!ClassDecl->hasTrivialDestructor())
324 ReferenceTemporaryDtor = ClassDecl->getDestructor();
325 }
326
327 if (!ReferenceTemporaryDtor)
328 return;
329
330 // Call the destructor for the temporary.
331 switch (M->getStorageDuration()) {
332 case SD_Static:
333 case SD_Thread: {
334 llvm::FunctionCallee CleanupFn;
335 llvm::Constant *CleanupArg;
336 if (E->getType()->isArrayType()) {
337 CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
338 ReferenceTemporary, E->getType(),
339 CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
340 dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
341 CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
342 } else {
343 CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
344 GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
345 CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
346 }
347 CGF.CGM.getCXXABI().registerGlobalDtor(
348 CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
349 break;
350 }
351
352 case SD_FullExpression:
353 CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
354 CodeGenFunction::destroyCXXObject,
355 CGF.getLangOpts().Exceptions);
356 break;
357
358 case SD_Automatic:
359 CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
360 ReferenceTemporary, E->getType(),
361 CodeGenFunction::destroyCXXObject,
362 CGF.getLangOpts().Exceptions);
363 break;
364
365 case SD_Dynamic:
366 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 366)
;
367 }
368}
369
370static Address createReferenceTemporary(CodeGenFunction &CGF,
371 const MaterializeTemporaryExpr *M,
372 const Expr *Inner,
373 Address *Alloca = nullptr) {
374 auto &TCG = CGF.getTargetHooks();
375 switch (M->getStorageDuration()) {
376 case SD_FullExpression:
377 case SD_Automatic: {
378 // If we have a constant temporary array or record try to promote it into a
379 // constant global under the same rules a normal constant would've been
380 // promoted. This is easier on the optimizer and generally emits fewer
381 // instructions.
382 QualType Ty = Inner->getType();
383 if (CGF.CGM.getCodeGenOpts().MergeAllConstants &&
384 (Ty->isArrayType() || Ty->isRecordType()) &&
385 CGF.CGM.isTypeConstant(Ty, true))
386 if (auto Init = ConstantEmitter(CGF).tryEmitAbstract(Inner, Ty)) {
387 if (auto AddrSpace = CGF.getTarget().getConstantAddressSpace()) {
388 auto AS = AddrSpace.getValue();
389 auto *GV = new llvm::GlobalVariable(
390 CGF.CGM.getModule(), Init->getType(), /*isConstant=*/true,
391 llvm::GlobalValue::PrivateLinkage, Init, ".ref.tmp", nullptr,
392 llvm::GlobalValue::NotThreadLocal,
393 CGF.getContext().getTargetAddressSpace(AS));
394 CharUnits alignment = CGF.getContext().getTypeAlignInChars(Ty);
395 GV->setAlignment(alignment.getAsAlign());
396 llvm::Constant *C = GV;
397 if (AS != LangAS::Default)
398 C = TCG.performAddrSpaceCast(
399 CGF.CGM, GV, AS, LangAS::Default,
400 GV->getValueType()->getPointerTo(
401 CGF.getContext().getTargetAddressSpace(LangAS::Default)));
402 // FIXME: Should we put the new global into a COMDAT?
403 return Address(C, alignment);
404 }
405 }
406 return CGF.CreateMemTemp(Ty, "ref.tmp", Alloca);
407 }
408 case SD_Thread:
409 case SD_Static:
410 return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
411
412 case SD_Dynamic:
413 llvm_unreachable("temporary can't have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary can't have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 413)
;
414 }
415 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 415)
;
416}
417
418LValue CodeGenFunction::
419EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
420 const Expr *E = M->GetTemporaryExpr();
421
422 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
423 !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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
424 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
;
425
426 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
427 // as that will cause the lifetime adjustment to be lost for ARC
428 auto ownership = M->getType().getObjCLifetime();
429 if (ownership != Qualifiers::OCL_None &&
430 ownership != Qualifiers::OCL_ExplicitNone) {
431 Address Object = createReferenceTemporary(*this, M, E);
432 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
433 Object = Address(llvm::ConstantExpr::getBitCast(Var,
434 ConvertTypeForMem(E->getType())
435 ->getPointerTo(Object.getAddressSpace())),
436 Object.getAlignment());
437
438 // createReferenceTemporary will promote the temporary to a global with a
439 // constant initializer if it can. It can only do this to a value of
440 // ARC-manageable type if the value is global and therefore "immune" to
441 // ref-counting operations. Therefore we have no need to emit either a
442 // dynamic initialization or a cleanup and we can just return the address
443 // of the temporary.
444 if (Var->hasInitializer())
445 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
446
447 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
448 }
449 LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
450 AlignmentSource::Decl);
451
452 switch (getEvaluationKind(E->getType())) {
453 default: llvm_unreachable("expected scalar or aggregate expression")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 453)
;
454 case TEK_Scalar:
455 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
456 break;
457 case TEK_Aggregate: {
458 EmitAggExpr(E, AggValueSlot::forAddr(Object,
459 E->getType().getQualifiers(),
460 AggValueSlot::IsDestructed,
461 AggValueSlot::DoesNotNeedGCBarriers,
462 AggValueSlot::IsNotAliased,
463 AggValueSlot::DoesNotOverlap));
464 break;
465 }
466 }
467
468 pushTemporaryCleanup(*this, M, E, Object);
469 return RefTempDst;
470 }
471
472 SmallVector<const Expr *, 2> CommaLHSs;
473 SmallVector<SubobjectAdjustment, 2> Adjustments;
474 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
475
476 for (const auto &Ignored : CommaLHSs)
477 EmitIgnoredExpr(Ignored);
478
479 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
480 if (opaque->getType()->isRecordType()) {
481 assert(Adjustments.empty())((Adjustments.empty()) ? static_cast<void> (0) : __assert_fail
("Adjustments.empty()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 481, __PRETTY_FUNCTION__))
;
482 return EmitOpaqueValueLValue(opaque);
483 }
484 }
485
486 // Create and initialize the reference temporary.
487 Address Alloca = Address::invalid();
488 Address Object = createReferenceTemporary(*this, M, E, &Alloca);
489 if (auto *Var = dyn_cast<llvm::GlobalVariable>(
490 Object.getPointer()->stripPointerCasts())) {
491 Object = Address(llvm::ConstantExpr::getBitCast(
492 cast<llvm::Constant>(Object.getPointer()),
493 ConvertTypeForMem(E->getType())->getPointerTo()),
494 Object.getAlignment());
495 // If the temporary is a global and has a constant initializer or is a
496 // constant temporary that we promoted to a global, we may have already
497 // initialized it.
498 if (!Var->hasInitializer()) {
499 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
500 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
501 }
502 } else {
503 switch (M->getStorageDuration()) {
504 case SD_Automatic:
505 if (auto *Size = EmitLifetimeStart(
506 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
507 Alloca.getPointer())) {
508 pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
509 Alloca, Size);
510 }
511 break;
512
513 case SD_FullExpression: {
514 if (!ShouldEmitLifetimeMarkers)
515 break;
516
517 // Avoid creating a conditional cleanup just to hold an llvm.lifetime.end
518 // marker. Instead, start the lifetime of a conditional temporary earlier
519 // so that it's unconditional. Don't do this with sanitizers which need
520 // more precise lifetime marks.
521 ConditionalEvaluation *OldConditional = nullptr;
522 CGBuilderTy::InsertPoint OldIP;
523 if (isInConditionalBranch() && !E->getType().isDestructedType() &&
524 !SanOpts.has(SanitizerKind::HWAddress) &&
525 !SanOpts.has(SanitizerKind::Memory) &&
526 !CGM.getCodeGenOpts().SanitizeAddressUseAfterScope) {
527 OldConditional = OutermostConditional;
528 OutermostConditional = nullptr;
529
530 OldIP = Builder.saveIP();
531 llvm::BasicBlock *Block = OldConditional->getStartingBlock();
532 Builder.restoreIP(CGBuilderTy::InsertPoint(
533 Block, llvm::BasicBlock::iterator(Block->back())));
534 }
535
536 if (auto *Size = EmitLifetimeStart(
537 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
538 Alloca.getPointer())) {
539 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
540 Size);
541 }
542
543 if (OldConditional) {
544 OutermostConditional = OldConditional;
545 Builder.restoreIP(OldIP);
546 }
547 break;
548 }
549
550 default:
551 break;
552 }
553 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
554 }
555 pushTemporaryCleanup(*this, M, E, Object);
556
557 // Perform derived-to-base casts and/or field accesses, to get from the
558 // temporary object we created (and, potentially, for which we extended
559 // the lifetime) to the subobject we're binding the reference to.
560 for (unsigned I = Adjustments.size(); I != 0; --I) {
561 SubobjectAdjustment &Adjustment = Adjustments[I-1];
562 switch (Adjustment.Kind) {
563 case SubobjectAdjustment::DerivedToBaseAdjustment:
564 Object =
565 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
566 Adjustment.DerivedToBase.BasePath->path_begin(),
567 Adjustment.DerivedToBase.BasePath->path_end(),
568 /*NullCheckValue=*/ false, E->getExprLoc());
569 break;
570
571 case SubobjectAdjustment::FieldAdjustment: {
572 LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
573 LV = EmitLValueForField(LV, Adjustment.Field);
574 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__))
575 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__))
;
576 Object = LV.getAddress();
577 break;
578 }
579
580 case SubobjectAdjustment::MemberPointerAdjustment: {
581 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
582 Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
583 Adjustment.Ptr.MPT);
584 break;
585 }
586 }
587 }
588
589 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
590}
591
592RValue
593CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
594 // Emit the expression as an lvalue.
595 LValue LV = EmitLValue(E);
596 assert(LV.isSimple())((LV.isSimple()) ? static_cast<void> (0) : __assert_fail
("LV.isSimple()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 596, __PRETTY_FUNCTION__))
;
597 llvm::Value *Value = LV.getPointer();
598
599 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
600 // C++11 [dcl.ref]p5 (as amended by core issue 453):
601 // If a glvalue to which a reference is directly bound designates neither
602 // an existing object or function of an appropriate type nor a region of
603 // storage of suitable size and alignment to contain an object of the
604 // reference's type, the behavior is undefined.
605 QualType Ty = E->getType();
606 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
607 }
608
609 return RValue::get(Value);
610}
611
612
613/// getAccessedFieldNo - Given an encoded value and a result number, return the
614/// input field number being accessed.
615unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
616 const llvm::Constant *Elts) {
617 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
618 ->getZExtValue();
619}
620
621/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
622static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
623 llvm::Value *High) {
624 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
625 llvm::Value *K47 = Builder.getInt64(47);
626 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
627 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
628 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
629 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
630 return Builder.CreateMul(B1, KMul);
631}
632
633bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
634 return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
635 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
636}
637
638bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
639 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
640 return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
641 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
642 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
643 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
644}
645
646bool CodeGenFunction::sanitizePerformTypeCheck() const {
647 return SanOpts.has(SanitizerKind::Null) |
648 SanOpts.has(SanitizerKind::Alignment) |
649 SanOpts.has(SanitizerKind::ObjectSize) |
650 SanOpts.has(SanitizerKind::Vptr);
651}
652
653void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
654 llvm::Value *Ptr, QualType Ty,
655 CharUnits Alignment,
656 SanitizerSet SkippedChecks,
657 llvm::Value *ArraySize) {
658 if (!sanitizePerformTypeCheck())
659 return;
660
661 // Don't check pointers outside the default address space. The null check
662 // isn't correct, the object-size check isn't supported by LLVM, and we can't
663 // communicate the addresses to the runtime handler for the vptr check.
664 if (Ptr->getType()->getPointerAddressSpace())
665 return;
666
667 // Don't check pointers to volatile data. The behavior here is implementation-
668 // defined.
669 if (Ty.isVolatileQualified())
670 return;
671
672 SanitizerScope SanScope(this);
673
674 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
675 llvm::BasicBlock *Done = nullptr;
676
677 // Quickly determine whether we have a pointer to an alloca. It's possible
678 // to skip null checks, and some alignment checks, for these pointers. This
679 // can reduce compile-time significantly.
680 auto PtrToAlloca = dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCasts());
681
682 llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
683 llvm::Value *IsNonNull = nullptr;
684 bool IsGuaranteedNonNull =
685 SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
686 bool AllowNullPointers = isNullPointerAllowed(TCK);
687 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
688 !IsGuaranteedNonNull) {
689 // The glvalue must not be an empty glvalue.
690 IsNonNull = Builder.CreateIsNotNull(Ptr);
691
692 // The IR builder can constant-fold the null check if the pointer points to
693 // a constant.
694 IsGuaranteedNonNull = IsNonNull == True;
695
696 // Skip the null check if the pointer is known to be non-null.
697 if (!IsGuaranteedNonNull) {
698 if (AllowNullPointers) {
699 // When performing pointer casts, it's OK if the value is null.
700 // Skip the remaining checks in that case.
701 Done = createBasicBlock("null");
702 llvm::BasicBlock *Rest = createBasicBlock("not.null");
703 Builder.CreateCondBr(IsNonNull, Rest, Done);
704 EmitBlock(Rest);
705 } else {
706 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
707 }
708 }
709 }
710
711 if (SanOpts.has(SanitizerKind::ObjectSize) &&
712 !SkippedChecks.has(SanitizerKind::ObjectSize) &&
713 !Ty->isIncompleteType()) {
714 uint64_t TySize = getContext().getTypeSizeInChars(Ty).getQuantity();
715 llvm::Value *Size = llvm::ConstantInt::get(IntPtrTy, TySize);
716 if (ArraySize)
717 Size = Builder.CreateMul(Size, ArraySize);
718
719 // Degenerate case: new X[0] does not need an objectsize check.
720 llvm::Constant *ConstantSize = dyn_cast<llvm::Constant>(Size);
721 if (!ConstantSize || !ConstantSize->isNullValue()) {
722 // The glvalue must refer to a large enough storage region.
723 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
724 // to check this.
725 // FIXME: Get object address space
726 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
727 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
728 llvm::Value *Min = Builder.getFalse();
729 llvm::Value *NullIsUnknown = Builder.getFalse();
730 llvm::Value *Dynamic = Builder.getFalse();
731 llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
732 llvm::Value *LargeEnough = Builder.CreateICmpUGE(
733 Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown, Dynamic}), Size);
734 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
735 }
736 }
737
738 uint64_t AlignVal = 0;
739 llvm::Value *PtrAsInt = nullptr;
740
741 if (SanOpts.has(SanitizerKind::Alignment) &&
742 !SkippedChecks.has(SanitizerKind::Alignment)) {
743 AlignVal = Alignment.getQuantity();
744 if (!Ty->isIncompleteType() && !AlignVal)
745 AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
746
747 // The glvalue must be suitably aligned.
748 if (AlignVal > 1 &&
749 (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
750 PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
751 llvm::Value *Align = Builder.CreateAnd(
752 PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
753 llvm::Value *Aligned =
754 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
755 if (Aligned != True)
756 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
757 }
758 }
759
760 if (Checks.size() > 0) {
761 // Make sure we're not losing information. Alignment needs to be a power of
762 // 2
763 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 763, __PRETTY_FUNCTION__))
;
764 llvm::Constant *StaticData[] = {
765 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
766 llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
767 llvm::ConstantInt::get(Int8Ty, TCK)};
768 EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
769 PtrAsInt ? PtrAsInt : Ptr);
770 }
771
772 // If possible, check that the vptr indicates that there is a subobject of
773 // type Ty at offset zero within this object.
774 //
775 // C++11 [basic.life]p5,6:
776 // [For storage which does not refer to an object within its lifetime]
777 // The program has undefined behavior if:
778 // -- the [pointer or glvalue] is used to access a non-static data member
779 // or call a non-static member function
780 if (SanOpts.has(SanitizerKind::Vptr) &&
781 !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
782 // Ensure that the pointer is non-null before loading it. If there is no
783 // compile-time guarantee, reuse the run-time null check or emit a new one.
784 if (!IsGuaranteedNonNull) {
785 if (!IsNonNull)
786 IsNonNull = Builder.CreateIsNotNull(Ptr);
787 if (!Done)
788 Done = createBasicBlock("vptr.null");
789 llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
790 Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
791 EmitBlock(VptrNotNull);
792 }
793
794 // Compute a hash of the mangled name of the type.
795 //
796 // FIXME: This is not guaranteed to be deterministic! Move to a
797 // fingerprinting mechanism once LLVM provides one. For the time
798 // being the implementation happens to be deterministic.
799 SmallString<64> MangledName;
800 llvm::raw_svector_ostream Out(MangledName);
801 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
802 Out);
803
804 // Blacklist based on the mangled type.
805 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
806 SanitizerKind::Vptr, Out.str())) {
807 llvm::hash_code TypeHash = hash_value(Out.str());
808
809 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
810 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
811 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
812 Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
813 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
814 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
815
816 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
817 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
818
819 // Look the hash up in our cache.
820 const int CacheSize = 128;
821 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
822 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
823 "__ubsan_vptr_type_cache");
824 llvm::Value *Slot = Builder.CreateAnd(Hash,
825 llvm::ConstantInt::get(IntPtrTy,
826 CacheSize-1));
827 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
828 llvm::Value *CacheVal =
829 Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
830 getPointerAlign());
831
832 // If the hash isn't in the cache, call a runtime handler to perform the
833 // hard work of checking whether the vptr is for an object of the right
834 // type. This will either fill in the cache and return, or produce a
835 // diagnostic.
836 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
837 llvm::Constant *StaticData[] = {
838 EmitCheckSourceLocation(Loc),
839 EmitCheckTypeDescriptor(Ty),
840 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
841 llvm::ConstantInt::get(Int8Ty, TCK)
842 };
843 llvm::Value *DynamicData[] = { Ptr, Hash };
844 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
845 SanitizerHandler::DynamicTypeCacheMiss, StaticData,
846 DynamicData);
847 }
848 }
849
850 if (Done) {
851 Builder.CreateBr(Done);
852 EmitBlock(Done);
853 }
854}
855
856/// Determine whether this expression refers to a flexible array member in a
857/// struct. We disable array bounds checks for such members.
858static bool isFlexibleArrayMemberExpr(const Expr *E) {
859 // For compatibility with existing code, we treat arrays of length 0 or
860 // 1 as flexible array members.
861 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
862 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
863 if (CAT->getSize().ugt(1))
864 return false;
865 } else if (!isa<IncompleteArrayType>(AT))
866 return false;
867
868 E = E->IgnoreParens();
869
870 // A flexible array member must be the last member in the class.
871 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
872 // FIXME: If the base type of the member expr is not FD->getParent(),
873 // this should not be treated as a flexible array member access.
874 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
875 RecordDecl::field_iterator FI(
876 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
877 return ++FI == FD->getParent()->field_end();
878 }
879 } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
880 return IRE->getDecl()->getNextIvar() == nullptr;
881 }
882
883 return false;
884}
885
886llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
887 QualType EltTy) {
888 ASTContext &C = getContext();
889 uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
890 if (!EltSize)
891 return nullptr;
892
893 auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
894 if (!ArrayDeclRef)
895 return nullptr;
896
897 auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
898 if (!ParamDecl)
899 return nullptr;
900
901 auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
902 if (!POSAttr)
903 return nullptr;
904
905 // Don't load the size if it's a lower bound.
906 int POSType = POSAttr->getType();
907 if (POSType != 0 && POSType != 1)
908 return nullptr;
909
910 // Find the implicit size parameter.
911 auto PassedSizeIt = SizeArguments.find(ParamDecl);
912 if (PassedSizeIt == SizeArguments.end())
913 return nullptr;
914
915 const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
916 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 916, __PRETTY_FUNCTION__))
;
917 Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
918 llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
919 C.getSizeType(), E->getExprLoc());
920 llvm::Value *SizeOfElement =
921 llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
922 return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
923}
924
925/// If Base is known to point to the start of an array, return the length of
926/// that array. Return 0 if the length cannot be determined.
927static llvm::Value *getArrayIndexingBound(
928 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
929 // For the vector indexing extension, the bound is the number of elements.
930 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
931 IndexedType = Base->getType();
932 return CGF.Builder.getInt32(VT->getNumElements());
933 }
934
935 Base = Base->IgnoreParens();
936
937 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
938 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
939 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
940 IndexedType = CE->getSubExpr()->getType();
941 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
942 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
943 return CGF.Builder.getInt(CAT->getSize());
944 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
945 return CGF.getVLASize(VAT).NumElts;
946 // Ignore pass_object_size here. It's not applicable on decayed pointers.
947 }
948 }
949
950 QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
951 if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
952 IndexedType = Base->getType();
953 return POS;
954 }
955
956 return nullptr;
957}
958
959void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
960 llvm::Value *Index, QualType IndexType,
961 bool Accessed) {
962 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__))
963 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__))
;
964 SanitizerScope SanScope(this);
965
966 QualType IndexedType;
967 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
968 if (!Bound)
969 return;
970
971 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
972 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
973 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
974
975 llvm::Constant *StaticData[] = {
976 EmitCheckSourceLocation(E->getExprLoc()),
977 EmitCheckTypeDescriptor(IndexedType),
978 EmitCheckTypeDescriptor(IndexType)
979 };
980 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
981 : Builder.CreateICmpULE(IndexVal, BoundVal);
982 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
983 SanitizerHandler::OutOfBounds, StaticData, Index);
984}
985
986
987CodeGenFunction::ComplexPairTy CodeGenFunction::
988EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
989 bool isInc, bool isPre) {
990 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
991
992 llvm::Value *NextVal;
993 if (isa<llvm::IntegerType>(InVal.first->getType())) {
994 uint64_t AmountVal = isInc ? 1 : -1;
995 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
996
997 // Add the inc/dec to the real part.
998 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
999 } else {
1000 QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
1001 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
1002 if (!isInc)
1003 FVal.changeSign();
1004 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
1005
1006 // Add the inc/dec to the real part.
1007 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1008 }
1009
1010 ComplexPairTy IncVal(NextVal, InVal.second);
1011
1012 // Store the updated result through the lvalue.
1013 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
1014
1015 // If this is a postinc, return the value read from memory, otherwise use the
1016 // updated value.
1017 return isPre ? IncVal : InVal;
1018}
1019
1020void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
1021 CodeGenFunction *CGF) {
1022 // Bind VLAs in the cast type.
1023 if (CGF && E->getType()->isVariablyModifiedType())
1024 CGF->EmitVariablyModifiedType(E->getType());
1025
1026 if (CGDebugInfo *DI = getModuleDebugInfo())
1027 DI->EmitExplicitCastType(E->getType());
1028}
1029
1030//===----------------------------------------------------------------------===//
1031// LValue Expression Emission
1032//===----------------------------------------------------------------------===//
1033
1034/// EmitPointerWithAlignment - Given an expression of pointer type, try to
1035/// derive a more accurate bound on the alignment of the pointer.
1036Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
1037 LValueBaseInfo *BaseInfo,
1038 TBAAAccessInfo *TBAAInfo) {
1039 // We allow this with ObjC object pointers because of fragile ABIs.
1040 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__))
1041 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__))
;
1042 E = E->IgnoreParens();
1043
1044 // Casts:
1045 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
1046 if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
1047 CGM.EmitExplicitCastExprType(ECE, this);
1048
1049 switch (CE->getCastKind()) {
1050 // Non-converting casts (but not C's implicit conversion from void*).
1051 case CK_BitCast:
1052 case CK_NoOp:
1053 case CK_AddressSpaceConversion:
1054 if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
1055 if (PtrTy->getPointeeType()->isVoidType())
1056 break;
1057
1058 LValueBaseInfo InnerBaseInfo;
1059 TBAAAccessInfo InnerTBAAInfo;
1060 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
1061 &InnerBaseInfo,
1062 &InnerTBAAInfo);
1063 if (BaseInfo) *BaseInfo = InnerBaseInfo;
1064 if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
1065
1066 if (isa<ExplicitCastExpr>(CE)) {
1067 LValueBaseInfo TargetTypeBaseInfo;
1068 TBAAAccessInfo TargetTypeTBAAInfo;
1069 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(),
1070 &TargetTypeBaseInfo,
1071 &TargetTypeTBAAInfo);
1072 if (TBAAInfo)
1073 *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
1074 TargetTypeTBAAInfo);
1075 // If the source l-value is opaque, honor the alignment of the
1076 // casted-to type.
1077 if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
1078 if (BaseInfo)
1079 BaseInfo->mergeForCast(TargetTypeBaseInfo);
1080 Addr = Address(Addr.getPointer(), Align);
1081 }
1082 }
1083
1084 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
1085 CE->getCastKind() == CK_BitCast) {
1086 if (auto PT = E->getType()->getAs<PointerType>())
1087 EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
1088 /*MayBeNull=*/true,
1089 CodeGenFunction::CFITCK_UnrelatedCast,
1090 CE->getBeginLoc());
1091 }
1092 return CE->getCastKind() != CK_AddressSpaceConversion
1093 ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
1094 : Builder.CreateAddrSpaceCast(Addr,
1095 ConvertType(E->getType()));
1096 }
1097 break;
1098
1099 // Array-to-pointer decay.
1100 case CK_ArrayToPointerDecay:
1101 return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
1102
1103 // Derived-to-base conversions.
1104 case CK_UncheckedDerivedToBase:
1105 case CK_DerivedToBase: {
1106 // TODO: Support accesses to members of base classes in TBAA. For now, we
1107 // conservatively pretend that the complete object is of the base class
1108 // type.
1109 if (TBAAInfo)
1110 *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
1111 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
1112 auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
1113 return GetAddressOfBaseClass(Addr, Derived,
1114 CE->path_begin(), CE->path_end(),
1115 ShouldNullCheckClassCastValue(CE),
1116 CE->getExprLoc());
1117 }
1118
1119 // TODO: Is there any reason to treat base-to-derived conversions
1120 // specially?
1121 default:
1122 break;
1123 }
1124 }
1125
1126 // Unary &.
1127 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
1128 if (UO->getOpcode() == UO_AddrOf) {
1129 LValue LV = EmitLValue(UO->getSubExpr());
1130 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
1131 if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
1132 return LV.getAddress();
1133 }
1134 }
1135
1136 // TODO: conditional operators, comma.
1137
1138 // Otherwise, use the alignment of the type.
1139 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), BaseInfo,
1140 TBAAInfo);
1141 return Address(EmitScalarExpr(E), Align);
1142}
1143
1144RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
1145 if (Ty->isVoidType())
1146 return RValue::get(nullptr);
1147
1148 switch (getEvaluationKind(Ty)) {
1149 case TEK_Complex: {
1150 llvm::Type *EltTy =
1151 ConvertType(Ty->castAs<ComplexType>()->getElementType());
1152 llvm::Value *U = llvm::UndefValue::get(EltTy);
1153 return RValue::getComplex(std::make_pair(U, U));
1154 }
1155
1156 // If this is a use of an undefined aggregate type, the aggregate must have an
1157 // identifiable address. Just because the contents of the value are undefined
1158 // doesn't mean that the address can't be taken and compared.
1159 case TEK_Aggregate: {
1160 Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
1161 return RValue::getAggregate(DestPtr);
1162 }
1163
1164 case TEK_Scalar:
1165 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
1166 }
1167 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1167)
;
1168}
1169
1170RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
1171 const char *Name) {
1172 ErrorUnsupported(E, Name);
1173 return GetUndefRValue(E->getType());
1174}
1175
1176LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
1177 const char *Name) {
1178 ErrorUnsupported(E, Name);
1179 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
1180 return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
1181 E->getType());
1182}
1183
1184bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
1185 const Expr *Base = Obj;
1186 while (!isa<CXXThisExpr>(Base)) {
1187 // The result of a dynamic_cast can be null.
1188 if (isa<CXXDynamicCastExpr>(Base))
1189 return false;
1190
1191 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
1192 Base = CE->getSubExpr();
1193 } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
1194 Base = PE->getSubExpr();
1195 } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
1196 if (UO->getOpcode() == UO_Extension)
1197 Base = UO->getSubExpr();
1198 else
1199 return false;
1200 } else {
1201 return false;
1202 }
1203 }
1204 return true;
1205}
1206
1207LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
1208 LValue LV;
1209 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
1210 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
1211 else
1212 LV = EmitLValue(E);
1213 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
1214 SanitizerSet SkippedChecks;
1215 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
1216 bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
1217 if (IsBaseCXXThis)
1218 SkippedChecks.set(SanitizerKind::Alignment, true);
1219 if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
1220 SkippedChecks.set(SanitizerKind::Null, true);
1221 }
1222 EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(),
1223 E->getType(), LV.getAlignment(), SkippedChecks);
1224 }
1225 return LV;
1226}
1227
1228/// EmitLValue - Emit code to compute a designator that specifies the location
1229/// of the expression.
1230///
1231/// This can return one of two things: a simple address or a bitfield reference.
1232/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1233/// an LLVM pointer type.
1234///
1235/// If this returns a bitfield reference, nothing about the pointee type of the
1236/// LLVM value is known: For example, it may not be a pointer to an integer.
1237///
1238/// If this returns a normal address, and if the lvalue's C type is fixed size,
1239/// this method guarantees that the returned pointer type will point to an LLVM
1240/// type of the same size of the lvalue's type. If the lvalue has a variable
1241/// length type, this is not possible.
1242///
1243LValue CodeGenFunction::EmitLValue(const Expr *E) {
1244 ApplyDebugLocation DL(*this, E);
1245 switch (E->getStmtClass()) {
11
Control jumps to 'case SubstNonTypeTemplateParmExprClass:' at line 1359
14
Control jumps to 'case ExtVectorElementExprClass:' at line 1345
1246 default: return EmitUnsupportedLValue(E, "l-value expression");
1247
1248 case Expr::ObjCPropertyRefExprClass:
1249 llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1249)
;
1250
1251 case Expr::ObjCSelectorExprClass:
1252 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
1253 case Expr::ObjCIsaExprClass:
1254 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
1255 case Expr::BinaryOperatorClass:
1256 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
1257 case Expr::CompoundAssignOperatorClass: {
1258 QualType Ty = E->getType();
1259 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1260 Ty = AT->getValueType();
1261 if (!Ty->isAnyComplexType())
1262 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1263 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1264 }
1265 case Expr::CallExprClass:
1266 case Expr::CXXMemberCallExprClass:
1267 case Expr::CXXOperatorCallExprClass:
1268 case Expr::UserDefinedLiteralClass:
1269 return EmitCallExprLValue(cast<CallExpr>(E));
1270 case Expr::CXXRewrittenBinaryOperatorClass:
1271 return EmitLValue(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm());
1272 case Expr::VAArgExprClass:
1273 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
1274 case Expr::DeclRefExprClass:
1275 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
1276 case Expr::ConstantExprClass:
1277 return EmitLValue(cast<ConstantExpr>(E)->getSubExpr());
1278 case Expr::ParenExprClass:
1279 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
1280 case Expr::GenericSelectionExprClass:
1281 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
1282 case Expr::PredefinedExprClass:
1283 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
1284 case Expr::StringLiteralClass:
1285 return EmitStringLiteralLValue(cast<StringLiteral>(E));
1286 case Expr::ObjCEncodeExprClass:
1287 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
1288 case Expr::PseudoObjectExprClass:
1289 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
1290 case Expr::InitListExprClass:
1291 return EmitInitListLValue(cast<InitListExpr>(E));
1292 case Expr::CXXTemporaryObjectExprClass:
1293 case Expr::CXXConstructExprClass:
1294 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
1295 case Expr::CXXBindTemporaryExprClass:
1296 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
1297 case Expr::CXXUuidofExprClass:
1298 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
1299 case Expr::LambdaExprClass:
1300 return EmitAggExprToLValue(E);
1301
1302 case Expr::ExprWithCleanupsClass: {
1303 const auto *cleanups = cast<ExprWithCleanups>(E);
1304 enterFullExpression(cleanups);
1305 RunCleanupsScope Scope(*this);
1306 LValue LV = EmitLValue(cleanups->getSubExpr());
1307 if (LV.isSimple()) {
1308 // Defend against branches out of gnu statement expressions surrounded by
1309 // cleanups.
1310 llvm::Value *V = LV.getPointer();
1311 Scope.ForceCleanup({&V});
1312 return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
1313 getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
1314 }
1315 // FIXME: Is it possible to create an ExprWithCleanups that produces a
1316 // bitfield lvalue or some other non-simple lvalue?
1317 return LV;
1318 }
1319
1320 case Expr::CXXDefaultArgExprClass: {
1321 auto *DAE = cast<CXXDefaultArgExpr>(E);
1322 CXXDefaultArgExprScope Scope(*this, DAE);
1323 return EmitLValue(DAE->getExpr());
1324 }
1325 case Expr::CXXDefaultInitExprClass: {
1326 auto *DIE = cast<CXXDefaultInitExpr>(E);
1327 CXXDefaultInitExprScope Scope(*this, DIE);
1328 return EmitLValue(DIE->getExpr());
1329 }
1330 case Expr::CXXTypeidExprClass:
1331 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
1332
1333 case Expr::ObjCMessageExprClass:
1334 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
1335 case Expr::ObjCIvarRefExprClass:
1336 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
1337 case Expr::StmtExprClass:
1338 return EmitStmtExprLValue(cast<StmtExpr>(E));
1339 case Expr::UnaryOperatorClass:
1340 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
1341 case Expr::ArraySubscriptExprClass:
1342 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
1343 case Expr::OMPArraySectionExprClass:
1344 return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
1345 case Expr::ExtVectorElementExprClass:
1346 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
15
'E' is a 'ExtVectorElementExpr'
16
Calling 'CodeGenFunction::EmitExtVectorElementExpr'
1347 case Expr::MemberExprClass:
1348 return EmitMemberExpr(cast<MemberExpr>(E));
1349 case Expr::CompoundLiteralExprClass:
1350 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
1351 case Expr::ConditionalOperatorClass:
1352 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
1353 case Expr::BinaryConditionalOperatorClass:
1354 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
1355 case Expr::ChooseExprClass:
1356 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
1357 case Expr::OpaqueValueExprClass:
1358 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
1359 case Expr::SubstNonTypeTemplateParmExprClass:
1360 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
12
'E' is a 'SubstNonTypeTemplateParmExpr'
13
Calling 'CodeGenFunction::EmitLValue'
1361 case Expr::ImplicitCastExprClass:
1362 case Expr::CStyleCastExprClass:
1363 case Expr::CXXFunctionalCastExprClass:
1364 case Expr::CXXStaticCastExprClass:
1365 case Expr::CXXDynamicCastExprClass:
1366 case Expr::CXXReinterpretCastExprClass:
1367 case Expr::CXXConstCastExprClass:
1368 case Expr::ObjCBridgedCastExprClass:
1369 return EmitCastLValue(cast<CastExpr>(E));
1370
1371 case Expr::MaterializeTemporaryExprClass:
1372 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
1373
1374 case Expr::CoawaitExprClass:
1375 return EmitCoawaitLValue(cast<CoawaitExpr>(E));
1376 case Expr::CoyieldExprClass:
1377 return EmitCoyieldLValue(cast<CoyieldExpr>(E));
1378 }
1379}
1380
1381/// Given an object of the given canonical type, can we safely copy a
1382/// value out of it based on its initializer?
1383static bool isConstantEmittableObjectType(QualType type) {
1384 assert(type.isCanonical())((type.isCanonical()) ? static_cast<void> (0) : __assert_fail
("type.isCanonical()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1384, __PRETTY_FUNCTION__))
;
1385 assert(!type->isReferenceType())((!type->isReferenceType()) ? static_cast<void> (0) :
__assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1385, __PRETTY_FUNCTION__))
;
1386
1387 // Must be const-qualified but non-volatile.
1388 Qualifiers qs = type.getLocalQualifiers();
1389 if (!qs.hasConst() || qs.hasVolatile()) return false;
1390
1391 // Otherwise, all object types satisfy this except C++ classes with
1392 // mutable subobjects or non-trivial copy/destroy behavior.
1393 if (const auto *RT = dyn_cast<RecordType>(type))
1394 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1395 if (RD->hasMutableFields() || !RD->isTrivial())
1396 return false;
1397
1398 return true;
1399}
1400
1401/// Can we constant-emit a load of a reference to a variable of the
1402/// given type? This is different from predicates like
1403/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
1404/// in situations that don't necessarily satisfy the language's rules
1405/// for this (e.g. C++'s ODR-use rules). For example, we want to able
1406/// to do this with const float variables even if those variables
1407/// aren't marked 'constexpr'.
1408enum ConstantEmissionKind {
1409 CEK_None,
1410 CEK_AsReferenceOnly,
1411 CEK_AsValueOrReference,
1412 CEK_AsValueOnly
1413};
1414static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
1415 type = type.getCanonicalType();
1416 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
1417 if (isConstantEmittableObjectType(ref->getPointeeType()))
1418 return CEK_AsValueOrReference;
1419 return CEK_AsReferenceOnly;
1420 }
1421 if (isConstantEmittableObjectType(type))
1422 return CEK_AsValueOnly;
1423 return CEK_None;
1424}
1425
1426/// Try to emit a reference to the given value without producing it as
1427/// an l-value. This is just an optimization, but it avoids us needing
1428/// to emit global copies of variables if they're named without triggering
1429/// a formal use in a context where we can't emit a direct reference to them,
1430/// for instance if a block or lambda or a member of a local class uses a
1431/// const int variable or constexpr variable from an enclosing function.
1432CodeGenFunction::ConstantEmission
1433CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1434 ValueDecl *value = refExpr->getDecl();
1435
1436 // The value needs to be an enum constant or a constant variable.
1437 ConstantEmissionKind CEK;
1438 if (isa<ParmVarDecl>(value)) {
1439 CEK = CEK_None;
1440 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1441 CEK = checkVarTypeForConstantEmission(var->getType());
1442 } else if (isa<EnumConstantDecl>(value)) {
1443 CEK = CEK_AsValueOnly;
1444 } else {
1445 CEK = CEK_None;
1446 }
1447 if (CEK == CEK_None) return ConstantEmission();
1448
1449 Expr::EvalResult result;
1450 bool resultIsReference;
1451 QualType resultType;
1452
1453 // It's best to evaluate all the way as an r-value if that's permitted.
1454 if (CEK != CEK_AsReferenceOnly &&
1455 refExpr->EvaluateAsRValue(result, getContext())) {
1456 resultIsReference = false;
1457 resultType = refExpr->getType();
1458
1459 // Otherwise, try to evaluate as an l-value.
1460 } else if (CEK != CEK_AsValueOnly &&
1461 refExpr->EvaluateAsLValue(result, getContext())) {
1462 resultIsReference = true;
1463 resultType = value->getType();
1464
1465 // Failure.
1466 } else {
1467 return ConstantEmission();
1468 }
1469
1470 // In any case, if the initializer has side-effects, abandon ship.
1471 if (result.HasSideEffects)
1472 return ConstantEmission();
1473
1474 // Emit as a constant.
1475 auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
1476 result.Val, resultType);
1477
1478 // Make sure we emit a debug reference to the global variable.
1479 // This should probably fire even for
1480 if (isa<VarDecl>(value)) {
1481 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1482 EmitDeclRefExprDbgValue(refExpr, result.Val);
1483 } else {
1484 assert(isa<EnumConstantDecl>(value))((isa<EnumConstantDecl>(value)) ? static_cast<void>
(0) : __assert_fail ("isa<EnumConstantDecl>(value)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1484, __PRETTY_FUNCTION__))
;
1485 EmitDeclRefExprDbgValue(refExpr, result.Val);
1486 }
1487
1488 // If we emitted a reference constant, we need to dereference that.
1489 if (resultIsReference)
1490 return ConstantEmission::forReference(C);
1491
1492 return ConstantEmission::forValue(C);
1493}
1494
1495static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
1496 const MemberExpr *ME) {
1497 if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
1498 // Try to emit static variable member expressions as DREs.
1499 return DeclRefExpr::Create(
1500 CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
1501 /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
1502 ME->getType(), ME->getValueKind(), nullptr, nullptr, ME->isNonOdrUse());
1503 }
1504 return nullptr;
1505}
1506
1507CodeGenFunction::ConstantEmission
1508CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
1509 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
1510 return tryEmitAsConstant(DRE);
1511 return ConstantEmission();
1512}
1513
1514llvm::Value *CodeGenFunction::emitScalarConstant(
1515 const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
1516 assert(Constant && "not a constant")((Constant && "not a constant") ? static_cast<void
> (0) : __assert_fail ("Constant && \"not a constant\""
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1516, __PRETTY_FUNCTION__))
;
1517 if (Constant.isReference())
1518 return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
1519 E->getExprLoc())
1520 .getScalarVal();
1521 return Constant.getValue();
1522}
1523
1524llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1525 SourceLocation Loc) {
1526 return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
1527 lvalue.getType(), Loc, lvalue.getBaseInfo(),
1528 lvalue.getTBAAInfo(), lvalue.isNontemporal());
1529}
1530
1531static bool hasBooleanRepresentation(QualType Ty) {
1532 if (Ty->isBooleanType())
1533 return true;
1534
1535 if (const EnumType *ET = Ty->getAs<EnumType>())
1536 return ET->getDecl()->getIntegerType()->isBooleanType();
1537
1538 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1539 return hasBooleanRepresentation(AT->getValueType());
1540
1541 return false;
1542}
1543
1544static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1545 llvm::APInt &Min, llvm::APInt &End,
1546 bool StrictEnums, bool IsBool) {
1547 const EnumType *ET = Ty->getAs<EnumType>();
1548 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1549 ET && !ET->getDecl()->isFixed();
1550 if (!IsBool && !IsRegularCPlusPlusEnum)
1551 return false;
1552
1553 if (IsBool) {
1554 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1555 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1556 } else {
1557 const EnumDecl *ED = ET->getDecl();
1558 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1559 unsigned Bitwidth = LTy->getScalarSizeInBits();
1560 unsigned NumNegativeBits = ED->getNumNegativeBits();
1561 unsigned NumPositiveBits = ED->getNumPositiveBits();
1562
1563 if (NumNegativeBits) {
1564 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1565 assert(NumBits <= Bitwidth)((NumBits <= Bitwidth) ? static_cast<void> (0) : __assert_fail
("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1565, __PRETTY_FUNCTION__))
;
1566 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1567 Min = -End;
1568 } else {
1569 assert(NumPositiveBits <= Bitwidth)((NumPositiveBits <= Bitwidth) ? static_cast<void> (
0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1569, __PRETTY_FUNCTION__))
;
1570 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1571 Min = llvm::APInt(Bitwidth, 0);
1572 }
1573 }
1574 return true;
1575}
1576
1577llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1578 llvm::APInt Min, End;
1579 if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
1580 hasBooleanRepresentation(Ty)))
1581 return nullptr;
1582
1583 llvm::MDBuilder MDHelper(getLLVMContext());
1584 return MDHelper.createRange(Min, End);
1585}
1586
1587bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
1588 SourceLocation Loc) {
1589 bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
1590 bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
1591 if (!HasBoolCheck && !HasEnumCheck)
1592 return false;
1593
1594 bool IsBool = hasBooleanRepresentation(Ty) ||
1595 NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
1596 bool NeedsBoolCheck = HasBoolCheck && IsBool;
1597 bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
1598 if (!NeedsBoolCheck && !NeedsEnumCheck)
1599 return false;
1600
1601 // Single-bit booleans don't need to be checked. Special-case this to avoid
1602 // a bit width mismatch when handling bitfield values. This is handled by
1603 // EmitFromMemory for the non-bitfield case.
1604 if (IsBool &&
1605 cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
1606 return false;
1607
1608 llvm::APInt Min, End;
1609 if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
1610 return true;
1611
1612 auto &Ctx = getLLVMContext();
1613 SanitizerScope SanScope(this);
1614 llvm::Value *Check;
1615 --End;
1616 if (!Min) {
1617 Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
1618 } else {
1619 llvm::Value *Upper =
1620 Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
1621 llvm::Value *Lower =
1622 Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
1623 Check = Builder.CreateAnd(Upper, Lower);
1624 }
1625 llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
1626 EmitCheckTypeDescriptor(Ty)};
1627 SanitizerMask Kind =
1628 NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1629 EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
1630 StaticArgs, EmitCheckValue(Value));
1631 return true;
1632}
1633
1634llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
1635 QualType Ty,
1636 SourceLocation Loc,
1637 LValueBaseInfo BaseInfo,
1638 TBAAAccessInfo TBAAInfo,
1639 bool isNontemporal) {
1640 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1641 // For better performance, handle vector loads differently.
1642 if (Ty->isVectorType()) {
1643 const llvm::Type *EltTy = Addr.getElementType();
1644
1645 const auto *VTy = cast<llvm::VectorType>(EltTy);
1646
1647 // Handle vectors of size 3 like size 4 for better performance.
1648 if (VTy->getNumElements() == 3) {
1649
1650 // Bitcast to vec4 type.
1651 llvm::VectorType *vec4Ty =
1652 llvm::VectorType::get(VTy->getElementType(), 4);
1653 Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
1654 // Now load value.
1655 llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1656
1657 // Shuffle vector to get vec3.
1658 V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
1659 {0, 1, 2}, "extractVec");
1660 return EmitFromMemory(V, Ty);
1661 }
1662 }
1663 }
1664
1665 // Atomic operations have to be done on integral types.
1666 LValue AtomicLValue =
1667 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1668 if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
1669 return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
1670 }
1671
1672 llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
1673 if (isNontemporal) {
1674 llvm::MDNode *Node = llvm::MDNode::get(
1675 Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1676 Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1677 }
1678
1679 CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
1680
1681 if (EmitScalarRangeCheck(Load, Ty, Loc)) {
1682 // In order to prevent the optimizer from throwing away the check, don't
1683 // attach range metadata to the load.
1684 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1685 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1686 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1687
1688 return EmitFromMemory(Load, Ty);
1689}
1690
1691llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1692 // Bool has a different representation in memory than in registers.
1693 if (hasBooleanRepresentation(Ty)) {
1694 // This should really always be an i1, but sometimes it's already
1695 // an i8, and it's awkward to track those cases down.
1696 if (Value->getType()->isIntegerTy(1))
1697 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1698 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1699, __PRETTY_FUNCTION__))
1699 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1699, __PRETTY_FUNCTION__))
;
1700 }
1701
1702 return Value;
1703}
1704
1705llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1706 // Bool has a different representation in memory than in registers.
1707 if (hasBooleanRepresentation(Ty)) {
1708 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1709, __PRETTY_FUNCTION__))
1709 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1709, __PRETTY_FUNCTION__))
;
1710 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1711 }
1712
1713 return Value;
1714}
1715
1716void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
1717 bool Volatile, QualType Ty,
1718 LValueBaseInfo BaseInfo,
1719 TBAAAccessInfo TBAAInfo,
1720 bool isInit, bool isNontemporal) {
1721 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1722 // Handle vectors differently to get better performance.
1723 if (Ty->isVectorType()) {
1724 llvm::Type *SrcTy = Value->getType();
1725 auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
1726 // Handle vec3 special.
1727 if (VecTy && VecTy->getNumElements() == 3) {
1728 // Our source is a vec3, do a shuffle vector to make it a vec4.
1729 llvm::Constant *Mask[] = {Builder.getInt32(0), Builder.getInt32(1),
1730 Builder.getInt32(2),
1731 llvm::UndefValue::get(Builder.getInt32Ty())};
1732 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1733 Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
1734 MaskV, "extractVec");
1735 SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
1736 }
1737 if (Addr.getElementType() != SrcTy) {
1738 Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
1739 }
1740 }
1741 }
1742
1743 Value = EmitToMemory(Value, Ty);
1744
1745 LValue AtomicLValue =
1746 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1747 if (Ty->isAtomicType() ||
1748 (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
1749 EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
1750 return;
1751 }
1752
1753 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1754 if (isNontemporal) {
1755 llvm::MDNode *Node =
1756 llvm::MDNode::get(Store->getContext(),
1757 llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1758 Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1759 }
1760
1761 CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
1762}
1763
1764void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1765 bool isInit) {
1766 EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
1767 lvalue.getType(), lvalue.getBaseInfo(),
1768 lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1769}
1770
1771/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1772/// method emits the address of the lvalue, then loads the result as an rvalue,
1773/// returning the rvalue.
1774RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1775 if (LV.isObjCWeak()) {
1776 // load of a __weak object.
1777 Address AddrWeakObj = LV.getAddress();
1778 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1779 AddrWeakObj));
1780 }
1781 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1782 // In MRC mode, we do a load+autorelease.
1783 if (!getLangOpts().ObjCAutoRefCount) {
1784 return RValue::get(EmitARCLoadWeak(LV.getAddress()));
1785 }
1786
1787 // In ARC mode, we load retained and then consume the value.
1788 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
1789 Object = EmitObjCConsumeObject(LV.getType(), Object);
1790 return RValue::get(Object);
1791 }
1792
1793 if (LV.isSimple()) {
1794 assert(!LV.getType()->isFunctionType())((!LV.getType()->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("!LV.getType()->isFunctionType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1794, __PRETTY_FUNCTION__))
;
1795
1796 // Everything needs a load.
1797 return RValue::get(EmitLoadOfScalar(LV, Loc));
1798 }
1799
1800 if (LV.isVectorElt()) {
1801 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
1802 LV.isVolatileQualified());
1803 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1804 "vecext"));
1805 }
1806
1807 // If this is a reference to a subset of the elements of a vector, either
1808 // shuffle the input or extract/insert them as appropriate.
1809 if (LV.isExtVectorElt())
1810 return EmitLoadOfExtVectorElementLValue(LV);
1811
1812 // Global Register variables always invoke intrinsics
1813 if (LV.isGlobalReg())
1814 return EmitLoadOfGlobalRegLValue(LV);
1815
1816 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1816, __PRETTY_FUNCTION__))
;
1817 return EmitLoadOfBitfieldLValue(LV, Loc);
1818}
1819
1820RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
1821 SourceLocation Loc) {
1822 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1823
1824 // Get the output type.
1825 llvm::Type *ResLTy = ConvertType(LV.getType());
1826
1827 Address Ptr = LV.getBitFieldAddress();
1828 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
1829
1830 if (Info.IsSigned) {
1831 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1831, __PRETTY_FUNCTION__))
;
1832 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1833 if (HighBits)
1834 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1835 if (Info.Offset + HighBits)
1836 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1837 } else {
1838 if (Info.Offset)
1839 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1840 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1841 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1842 Info.Size),
1843 "bf.clear");
1844 }
1845 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1846 EmitScalarRangeCheck(Val, LV.getType(), Loc);
1847 return RValue::get(Val);
1848}
1849
1850// If this is a reference to a subset of the elements of a vector, create an
1851// appropriate shufflevector.
1852RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1853 llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
1854 LV.isVolatileQualified());
1855
1856 const llvm::Constant *Elts = LV.getExtVectorElts();
1857
1858 // If the result of the expression is a non-vector type, we must be extracting
1859 // a single element. Just codegen as an extractelement.
1860 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1861 if (!ExprVT) {
1862 unsigned InIdx = getAccessedFieldNo(0, Elts);
1863 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1864 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1865 }
1866
1867 // Always use shuffle vector to try to retain the original program structure
1868 unsigned NumResultElts = ExprVT->getNumElements();
1869
1870 SmallVector<llvm::Constant*, 4> Mask;
1871 for (unsigned i = 0; i != NumResultElts; ++i)
1872 Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
1873
1874 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1875 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1876 MaskV);
1877 return RValue::get(Vec);
1878}
1879
1880/// Generates lvalue for partial ext_vector access.
1881Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1882 Address VectorAddress = LV.getExtVectorAddress();
1883 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1884 QualType EQT = ExprVT->getElementType();
1885 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1886
1887 Address CastToPointerElement =
1888 Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
1889 "conv.ptr.element");
1890
1891 const llvm::Constant *Elts = LV.getExtVectorElts();
1892 unsigned ix = getAccessedFieldNo(0, Elts);
1893
1894 Address VectorBasePtrPlusIx =
1895 Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
1896 "vector.elt");
1897
1898 return VectorBasePtrPlusIx;
1899}
1900
1901/// Load of global gamed gegisters are always calls to intrinsics.
1902RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
1903 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1904, __PRETTY_FUNCTION__))
1904 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1904, __PRETTY_FUNCTION__))
;
1905 llvm::MDNode *RegName = cast<llvm::MDNode>(
1906 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
1907
1908 // We accept integer and pointer types only
1909 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
1910 llvm::Type *Ty = OrigTy;
1911 if (OrigTy->isPointerTy())
1912 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
1913 llvm::Type *Types[] = { Ty };
1914
1915 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
1916 llvm::Value *Call = Builder.CreateCall(
1917 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
1918 if (OrigTy->isPointerTy())
1919 Call = Builder.CreateIntToPtr(Call, OrigTy);
1920 return RValue::get(Call);
1921}
1922
1923
1924/// EmitStoreThroughLValue - Store the specified rvalue into the specified
1925/// lvalue, where both are guaranteed to the have the same type, and that type
1926/// is 'Ty'.
1927void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
1928 bool isInit) {
1929 if (!Dst.isSimple()) {
1930 if (Dst.isVectorElt()) {
1931 // Read/modify/write the vector, inserting the new element.
1932 llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
1933 Dst.isVolatileQualified());
1934 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
1935 Dst.getVectorIdx(), "vecins");
1936 Builder.CreateStore(Vec, Dst.getVectorAddress(),
1937 Dst.isVolatileQualified());
1938 return;
1939 }
1940
1941 // If this is an update of extended vector elements, insert them as
1942 // appropriate.
1943 if (Dst.isExtVectorElt())
1944 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
1945
1946 if (Dst.isGlobalReg())
1947 return EmitStoreThroughGlobalRegLValue(Src, Dst);
1948
1949 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1949, __PRETTY_FUNCTION__))
;
1950 return EmitStoreThroughBitfieldLValue(Src, Dst);
1951 }
1952
1953 // There's special magic for assigning into an ARC-qualified l-value.
1954 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
1955 switch (Lifetime) {
1956 case Qualifiers::OCL_None:
1957 llvm_unreachable("present but none")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 1957)
;
1958
1959 case Qualifiers::OCL_ExplicitNone:
1960 // nothing special
1961 break;
1962
1963 case Qualifiers::OCL_Strong:
1964 if (isInit) {
1965 Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
1966 break;
1967 }
1968 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
1969 return;
1970
1971 case Qualifiers::OCL_Weak:
1972 if (isInit)
1973 // Initialize and then skip the primitive store.
1974 EmitARCInitWeak(Dst.getAddress(), Src.getScalarVal());
1975 else
1976 EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
1977 return;
1978
1979 case Qualifiers::OCL_Autoreleasing:
1980 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
1981 Src.getScalarVal()));
1982 // fall into the normal path
1983 break;
1984 }
1985 }
1986
1987 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
1988 // load of a __weak object.
1989 Address LvalueDst = Dst.getAddress();
1990 llvm::Value *src = Src.getScalarVal();
1991 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
1992 return;
1993 }
1994
1995 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
1996 // load of a __strong object.
1997 Address LvalueDst = Dst.getAddress();
1998 llvm::Value *src = Src.getScalarVal();
1999 if (Dst.isObjCIvar()) {
2000 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2000, __PRETTY_FUNCTION__))
;
2001 llvm::Type *ResultType = IntPtrTy;
2002 Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
2003 llvm::Value *RHS = dst.getPointer();
2004 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
2005 llvm::Value *LHS =
2006 Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
2007 "sub.ptr.lhs.cast");
2008 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
2009 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
2010 BytesBetween);
2011 } else if (Dst.isGlobalObjCRef()) {
2012 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
2013 Dst.isThreadLocalRef());
2014 }
2015 else
2016 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
2017 return;
2018 }
2019
2020 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2020, __PRETTY_FUNCTION__))
;
2021 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
2022}
2023
2024void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
2025 llvm::Value **Result) {
2026 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
2027 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
2028 Address Ptr = Dst.getBitFieldAddress();
2029
2030 // Get the source value, truncated to the width of the bit-field.
2031 llvm::Value *SrcVal = Src.getScalarVal();
2032
2033 // Cast the source to the storage type and shift it into place.
2034 SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
2035 /*isSigned=*/false);
2036 llvm::Value *MaskedVal = SrcVal;
2037
2038 // See if there are other bits in the bitfield's storage we'll need to load
2039 // and mask together with source before storing.
2040 if (Info.StorageSize != Info.Size) {
2041 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2041, __PRETTY_FUNCTION__))
;
2042 llvm::Value *Val =
2043 Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
2044
2045 // Mask the source value as needed.
2046 if (!hasBooleanRepresentation(Dst.getType()))
2047 SrcVal = Builder.CreateAnd(SrcVal,
2048 llvm::APInt::getLowBitsSet(Info.StorageSize,
2049 Info.Size),
2050 "bf.value");
2051 MaskedVal = SrcVal;
2052 if (Info.Offset)
2053 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
2054
2055 // Mask out the original value.
2056 Val = Builder.CreateAnd(Val,
2057 ~llvm::APInt::getBitsSet(Info.StorageSize,
2058 Info.Offset,
2059 Info.Offset + Info.Size),
2060 "bf.clear");
2061
2062 // Or together the unchanged values and the source value.
2063 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
2064 } else {
2065 assert(Info.Offset == 0)((Info.Offset == 0) ? static_cast<void> (0) : __assert_fail
("Info.Offset == 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2065, __PRETTY_FUNCTION__))
;
2066 }
2067
2068 // Write the new value back out.
2069 Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
2070
2071 // Return the new value of the bit-field, if requested.
2072 if (Result) {
2073 llvm::Value *ResultVal = MaskedVal;
2074
2075 // Sign extend the value if needed.
2076 if (Info.IsSigned) {
2077 assert(Info.Size <= Info.StorageSize)((Info.Size <= Info.StorageSize) ? static_cast<void>
(0) : __assert_fail ("Info.Size <= Info.StorageSize", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2077, __PRETTY_FUNCTION__))
;
2078 unsigned HighBits = Info.StorageSize - Info.Size;
2079 if (HighBits) {
2080 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
2081 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
2082 }
2083 }
2084
2085 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
2086 "bf.result.cast");
2087 *Result = EmitFromMemory(ResultVal, Dst.getType());
2088 }
2089}
2090
2091void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
2092 LValue Dst) {
2093 // This access turns into a read/modify/write of the vector. Load the input
2094 // value now.
2095 llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
2096 Dst.isVolatileQualified());
2097 const llvm::Constant *Elts = Dst.getExtVectorElts();
2098
2099 llvm::Value *SrcVal = Src.getScalarVal();
2100
2101 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
2102 unsigned NumSrcElts = VTy->getNumElements();
2103 unsigned NumDstElts = Vec->getType()->getVectorNumElements();
2104 if (NumDstElts == NumSrcElts) {
2105 // Use shuffle vector is the src and destination are the same number of
2106 // elements and restore the vector mask since it is on the side it will be
2107 // stored.
2108 SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
2109 for (unsigned i = 0; i != NumSrcElts; ++i)
2110 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
2111
2112 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2113 Vec = Builder.CreateShuffleVector(SrcVal,
2114 llvm::UndefValue::get(Vec->getType()),
2115 MaskV);
2116 } else if (NumDstElts > NumSrcElts) {
2117 // Extended the source vector to the same length and then shuffle it
2118 // into the destination.
2119 // FIXME: since we're shuffling with undef, can we just use the indices
2120 // into that? This could be simpler.
2121 SmallVector<llvm::Constant*, 4> ExtMask;
2122 for (unsigned i = 0; i != NumSrcElts; ++i)
2123 ExtMask.push_back(Builder.getInt32(i));
2124 ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
2125 llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
2126 llvm::Value *ExtSrcVal =
2127 Builder.CreateShuffleVector(SrcVal,
2128 llvm::UndefValue::get(SrcVal->getType()),
2129 ExtMaskV);
2130 // build identity
2131 SmallVector<llvm::Constant*, 4> Mask;
2132 for (unsigned i = 0; i != NumDstElts; ++i)
2133 Mask.push_back(Builder.getInt32(i));
2134
2135 // When the vector size is odd and .odd or .hi is used, the last element
2136 // of the Elts constant array will be one past the size of the vector.
2137 // Ignore the last element here, if it is greater than the mask size.
2138 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
2139 NumSrcElts--;
2140
2141 // modify when what gets shuffled in
2142 for (unsigned i = 0; i != NumSrcElts; ++i)
2143 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
2144 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2145 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
2146 } else {
2147 // We should never shorten the vector
2148 llvm_unreachable("unexpected shorten vector length")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2148)
;
2149 }
2150 } else {
2151 // If the Src is a scalar (not a vector) it must be updating one element.
2152 unsigned InIdx = getAccessedFieldNo(0, Elts);
2153 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
2154 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
2155 }
2156
2157 Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
2158 Dst.isVolatileQualified());
2159}
2160
2161/// Store of global named registers are always calls to intrinsics.
2162void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
2163 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2164, __PRETTY_FUNCTION__))
2164 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2164, __PRETTY_FUNCTION__))
;
2165 llvm::MDNode *RegName = cast<llvm::MDNode>(
2166 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
2167 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2167, __PRETTY_FUNCTION__))
;
2168
2169 // We accept integer and pointer types only
2170 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
2171 llvm::Type *Ty = OrigTy;
2172 if (OrigTy->isPointerTy())
2173 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2174 llvm::Type *Types[] = { Ty };
2175
2176 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
2177 llvm::Value *Value = Src.getScalarVal();
2178 if (OrigTy->isPointerTy())
2179 Value = Builder.CreatePtrToInt(Value, Ty);
2180 Builder.CreateCall(
2181 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
2182}
2183
2184// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2185// generating write-barries API. It is currently a global, ivar,
2186// or neither.
2187static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
2188 LValue &LV,
2189 bool IsMemberAccess=false) {
2190 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
2191 return;
2192
2193 if (isa<ObjCIvarRefExpr>(E)) {
2194 QualType ExpTy = E->getType();
2195 if (IsMemberAccess && ExpTy->isPointerType()) {
2196 // If ivar is a structure pointer, assigning to field of
2197 // this struct follows gcc's behavior and makes it a non-ivar
2198 // writer-barrier conservatively.
2199 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2200 if (ExpTy->isRecordType()) {
2201 LV.setObjCIvar(false);
2202 return;
2203 }
2204 }
2205 LV.setObjCIvar(true);
2206 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
2207 LV.setBaseIvarExp(Exp->getBase());
2208 LV.setObjCArray(E->getType()->isArrayType());
2209 return;
2210 }
2211
2212 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
2213 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
2214 if (VD->hasGlobalStorage()) {
2215 LV.setGlobalObjCRef(true);
2216 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
2217 }
2218 }
2219 LV.setObjCArray(E->getType()->isArrayType());
2220 return;
2221 }
2222
2223 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
2224 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2225 return;
2226 }
2227
2228 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
2229 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2230 if (LV.isObjCIvar()) {
2231 // If cast is to a structure pointer, follow gcc's behavior and make it
2232 // a non-ivar write-barrier.
2233 QualType ExpTy = E->getType();
2234 if (ExpTy->isPointerType())
2235 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2236 if (ExpTy->isRecordType())
2237 LV.setObjCIvar(false);
2238 }
2239 return;
2240 }
2241
2242 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
2243 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
2244 return;
2245 }
2246
2247 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
2248 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2249 return;
2250 }
2251
2252 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
2253 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2254 return;
2255 }
2256
2257 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
2258 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2259 return;
2260 }
2261
2262 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
2263 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
2264 if (LV.isObjCIvar() && !LV.isObjCArray())
2265 // Using array syntax to assigning to what an ivar points to is not
2266 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
2267 LV.setObjCIvar(false);
2268 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
2269 // Using array syntax to assigning to what global points to is not
2270 // same as assigning to the global itself. {id *G;} G[i] = 0;
2271 LV.setGlobalObjCRef(false);
2272 return;
2273 }
2274
2275 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
2276 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
2277 // We don't know if member is an 'ivar', but this flag is looked at
2278 // only in the context of LV.isObjCIvar().
2279 LV.setObjCArray(E->getType()->isArrayType());
2280 return;
2281 }
2282}
2283
2284static llvm::Value *
2285EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
2286 llvm::Value *V, llvm::Type *IRType,
2287 StringRef Name = StringRef()) {
2288 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2289 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
2290}
2291
2292static LValue EmitThreadPrivateVarDeclLValue(
2293 CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
2294 llvm::Type *RealVarTy, SourceLocation Loc) {
2295 Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
2296 Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
2297 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2298}
2299
2300static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
2301 const VarDecl *VD, QualType T) {
2302 llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
2303 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
2304 // Return an invalid address if variable is MT_To and unified
2305 // memory is not enabled. For all other cases: MT_Link and
2306 // MT_To with unified memory, return a valid address.
2307 if (!Res || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
2308 !CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory()))
2309 return Address::invalid();
2310 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
2311 (*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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
2312 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
2313 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2313, __PRETTY_FUNCTION__))
;
2314 QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
2315 Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
2316 return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2317}
2318
2319Address
2320CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
2321 LValueBaseInfo *PointeeBaseInfo,
2322 TBAAAccessInfo *PointeeTBAAInfo) {
2323 llvm::LoadInst *Load = Builder.CreateLoad(RefLVal.getAddress(),
2324 RefLVal.isVolatile());
2325 CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
2326
2327 CharUnits Align = getNaturalTypeAlignment(RefLVal.getType()->getPointeeType(),
2328 PointeeBaseInfo, PointeeTBAAInfo,
2329 /* forPointeeType= */ true);
2330 return Address(Load, Align);
2331}
2332
2333LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
2334 LValueBaseInfo PointeeBaseInfo;
2335 TBAAAccessInfo PointeeTBAAInfo;
2336 Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
2337 &PointeeTBAAInfo);
2338 return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
2339 PointeeBaseInfo, PointeeTBAAInfo);
2340}
2341
2342Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
2343 const PointerType *PtrTy,
2344 LValueBaseInfo *BaseInfo,
2345 TBAAAccessInfo *TBAAInfo) {
2346 llvm::Value *Addr = Builder.CreateLoad(Ptr);
2347 return Address(Addr, getNaturalTypeAlignment(PtrTy->getPointeeType(),
2348 BaseInfo, TBAAInfo,
2349 /*forPointeeType=*/true));
2350}
2351
2352LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
2353 const PointerType *PtrTy) {
2354 LValueBaseInfo BaseInfo;
2355 TBAAAccessInfo TBAAInfo;
2356 Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
2357 return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
2358}
2359
2360static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
2361 const Expr *E, const VarDecl *VD) {
2362 QualType T = E->getType();
2363
2364 // If it's thread_local, emit a call to its wrapper function instead.
2365 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
2366 CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
2367 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
2368 // Check if the variable is marked as declare target with link clause in
2369 // device codegen.
2370 if (CGF.getLangOpts().OpenMPIsDevice) {
2371 Address Addr = emitDeclTargetVarDeclLValue(CGF, VD, T);
2372 if (Addr.isValid())
2373 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2374 }
2375
2376 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2377 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2378 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
2379 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2380 Address Addr(V, Alignment);
2381 // Emit reference to the private copy of the variable if it is an OpenMP
2382 // threadprivate variable.
2383 if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
2384 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2385 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
2386 E->getExprLoc());
2387 }
2388 LValue LV = VD->getType()->isReferenceType() ?
2389 CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2390 AlignmentSource::Decl) :
2391 CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2392 setObjCGCLValueClass(CGF.getContext(), E, LV);
2393 return LV;
2394}
2395
2396static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
2397 const FunctionDecl *FD) {
2398 if (FD->hasAttr<WeakRefAttr>()) {
2399 ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
2400 return aliasee.getPointer();
2401 }
2402
2403 llvm::Constant *V = CGM.GetAddrOfFunction(FD);
2404 if (!FD->hasPrototype()) {
2405 if (const FunctionProtoType *Proto =
2406 FD->getType()->getAs<FunctionProtoType>()) {
2407 // Ugly case: for a K&R-style definition, the type of the definition
2408 // isn't the same as the type of a use. Correct for this with a
2409 // bitcast.
2410 QualType NoProtoType =
2411 CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
2412 NoProtoType = CGM.getContext().getPointerType(NoProtoType);
2413 V = llvm::ConstantExpr::getBitCast(V,
2414 CGM.getTypes().ConvertType(NoProtoType));
2415 }
2416 }
2417 return V;
2418}
2419
2420static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
2421 const Expr *E, const FunctionDecl *FD) {
2422 llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, FD);
2423 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
2424 return CGF.MakeAddrLValue(V, E->getType(), Alignment,
2425 AlignmentSource::Decl);
2426}
2427
2428static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
2429 llvm::Value *ThisValue) {
2430 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
2431 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
2432 return CGF.EmitLValueForField(LV, FD);
2433}
2434
2435/// Named Registers are named metadata pointing to the register name
2436/// which will be read from/written to as an argument to the intrinsic
2437/// @llvm.read/write_register.
2438/// So far, only the name is being passed down, but other options such as
2439/// register type, allocation type or even optimization options could be
2440/// passed down via the metadata node.
2441static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
2442 SmallString<64> Name("llvm.named.register.");
2443 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
2444 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2445, __PRETTY_FUNCTION__))
2445 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2445, __PRETTY_FUNCTION__))
;
2446 Name.append(Asm->getLabel());
2447 llvm::NamedMDNode *M =
2448 CGM.getModule().getOrInsertNamedMetadata(Name);
2449 if (M->getNumOperands() == 0) {
2450 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
2451 Asm->getLabel());
2452 llvm::Metadata *Ops[] = {Str};
2453 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
2454 }
2455
2456 CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
2457
2458 llvm::Value *Ptr =
2459 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
2460 return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
2461}
2462
2463/// Determine whether we can emit a reference to \p VD from the current
2464/// context, despite not necessarily having seen an odr-use of the variable in
2465/// this context.
2466static bool canEmitSpuriousReferenceToVariable(CodeGenFunction &CGF,
2467 const DeclRefExpr *E,
2468 const VarDecl *VD,
2469 bool IsConstant) {
2470 // For a variable declared in an enclosing scope, do not emit a spurious
2471 // reference even if we have a capture, as that will emit an unwarranted
2472 // reference to our capture state, and will likely generate worse code than
2473 // emitting a local copy.
2474 if (E->refersToEnclosingVariableOrCapture())
2475 return false;
2476
2477 // For a local declaration declared in this function, we can always reference
2478 // it even if we don't have an odr-use.
2479 if (VD->hasLocalStorage()) {
2480 return VD->getDeclContext() ==
2481 dyn_cast_or_null<DeclContext>(CGF.CurCodeDecl);
2482 }
2483
2484 // For a global declaration, we can emit a reference to it if we know
2485 // for sure that we are able to emit a definition of it.
2486 VD = VD->getDefinition(CGF.getContext());
2487 if (!VD)
2488 return false;
2489
2490 // Don't emit a spurious reference if it might be to a variable that only
2491 // exists on a different device / target.
2492 // FIXME: This is unnecessarily broad. Check whether this would actually be a
2493 // cross-target reference.
2494 if (CGF.getLangOpts().OpenMP || CGF.getLangOpts().CUDA ||
2495 CGF.getLangOpts().OpenCL) {
2496 return false;
2497 }
2498
2499 // We can emit a spurious reference only if the linkage implies that we'll
2500 // be emitting a non-interposable symbol that will be retained until link
2501 // time.
2502 switch (CGF.CGM.getLLVMLinkageVarDefinition(VD, IsConstant)) {
2503 case llvm::GlobalValue::ExternalLinkage:
2504 case llvm::GlobalValue::LinkOnceODRLinkage:
2505 case llvm::GlobalValue::WeakODRLinkage:
2506 case llvm::GlobalValue::InternalLinkage:
2507 case llvm::GlobalValue::PrivateLinkage:
2508 return true;
2509 default:
2510 return false;
2511 }
2512}
2513
2514LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
2515 const NamedDecl *ND = E->getDecl();
2516 QualType T = E->getType();
2517
2518 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2519, __PRETTY_FUNCTION__))
2519 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2519, __PRETTY_FUNCTION__))
;
2520
2521 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2522 // Global Named registers access via intrinsics only
2523 if (VD->getStorageClass() == SC_Register &&
2524 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
2525 return EmitGlobalNamedRegister(VD, CGM);
2526
2527 // If this DeclRefExpr does not constitute an odr-use of the variable,
2528 // we're not permitted to emit a reference to it in general, and it might
2529 // not be captured if capture would be necessary for a use. Emit the
2530 // constant value directly instead.
2531 if (E->isNonOdrUse() == NOUR_Constant &&
2532 (VD->getType()->isReferenceType() ||
2533 !canEmitSpuriousReferenceToVariable(*this, E, VD, true))) {
2534 VD->getAnyInitializer(VD);
2535 llvm::Constant *Val = ConstantEmitter(*this).emitAbstract(
2536 E->getLocation(), *VD->evaluateValue(), VD->getType());
2537 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2537, __PRETTY_FUNCTION__))
;
2538
2539 Address Addr = Address::invalid();
2540 if (!VD->getType()->isReferenceType()) {
2541 // Spill the constant value to a global.
2542 Addr = CGM.createUnnamedGlobalFrom(*VD, Val,
2543 getContext().getDeclAlign(VD));
2544 llvm::Type *VarTy = getTypes().ConvertTypeForMem(VD->getType());
2545 auto *PTy = llvm::PointerType::get(
2546 VarTy, getContext().getTargetAddressSpace(VD->getType()));
2547 if (PTy != Addr.getType())
2548 Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, PTy);
2549 } else {
2550 // Should we be using the alignment of the constant pointer we emitted?
2551 CharUnits Alignment =
2552 getNaturalTypeAlignment(E->getType(),
2553 /* BaseInfo= */ nullptr,
2554 /* TBAAInfo= */ nullptr,
2555 /* forPointeeType= */ true);
2556 Addr = Address(Val, Alignment);
2557 }
2558 return MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2559 }
2560
2561 // FIXME: Handle other kinds of non-odr-use DeclRefExprs.
2562
2563 // Check for captured variables.
2564 if (E->refersToEnclosingVariableOrCapture()) {
2565 VD = VD->getCanonicalDecl();
2566 if (auto *FD = LambdaCaptureFields.lookup(VD))
2567 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
2568 else if (CapturedStmtInfo) {
2569 auto I = LocalDeclMap.find(VD);
2570 if (I != LocalDeclMap.end()) {
2571 if (VD->getType()->isReferenceType())
2572 return EmitLoadOfReferenceLValue(I->second, VD->getType(),
2573 AlignmentSource::Decl);
2574 return MakeAddrLValue(I->second, T);
2575 }
2576 LValue CapLVal =
2577 EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
2578 CapturedStmtInfo->getContextValue());
2579 return MakeAddrLValue(
2580 Address(CapLVal.getPointer(), getContext().getDeclAlign(VD)),
2581 CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
2582 CapLVal.getTBAAInfo());
2583 }
2584
2585 assert(isa<BlockDecl>(CurCodeDecl))((isa<BlockDecl>(CurCodeDecl)) ? static_cast<void>
(0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2585, __PRETTY_FUNCTION__))
;
2586 Address addr = GetAddrOfBlockDecl(VD);
2587 return MakeAddrLValue(addr, T, AlignmentSource::Decl);
2588 }
2589 }
2590
2591 // FIXME: We should be able to assert this for FunctionDecls as well!
2592 // FIXME: We should be able to assert this for all DeclRefExprs, not just
2593 // those with a valid source location.
2594 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__))
2595 !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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__))
2596 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2596, __PRETTY_FUNCTION__))
;
2597
2598 if (ND->hasAttr<WeakRefAttr>()) {
2599 const auto *VD = cast<ValueDecl>(ND);
2600 ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
2601 return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
2602 }
2603
2604 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2605 // Check if this is a global variable.
2606 if (VD->hasLinkage() || VD->isStaticDataMember())
2607 return EmitGlobalVarDeclLValue(*this, E, VD);
2608
2609 Address addr = Address::invalid();
2610
2611 // The variable should generally be present in the local decl map.
2612 auto iter = LocalDeclMap.find(VD);
2613 if (iter != LocalDeclMap.end()) {
2614 addr = iter->second;
2615
2616 // Otherwise, it might be static local we haven't emitted yet for
2617 // some reason; most likely, because it's in an outer function.
2618 } else if (VD->isStaticLocal()) {
2619 addr = Address(CGM.getOrCreateStaticVarDecl(
2620 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false)),
2621 getContext().getDeclAlign(VD));
2622
2623 // No other cases for now.
2624 } else {
2625 llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?")::llvm::llvm_unreachable_internal("DeclRefExpr for Decl not entered in LocalDeclMap?"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2625)
;
2626 }
2627
2628
2629 // Check for OpenMP threadprivate variables.
2630 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
2631 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2632 return EmitThreadPrivateVarDeclLValue(
2633 *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
2634 E->getExprLoc());
2635 }
2636
2637 // Drill into block byref variables.
2638 bool isBlockByref = VD->isEscapingByref();
2639 if (isBlockByref) {
2640 addr = emitBlockByrefAddress(addr, VD);
2641 }
2642
2643 // Drill into reference types.
2644 LValue LV = VD->getType()->isReferenceType() ?
2645 EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
2646 MakeAddrLValue(addr, T, AlignmentSource::Decl);
2647
2648 bool isLocalStorage = VD->hasLocalStorage();
2649
2650 bool NonGCable = isLocalStorage &&
2651 !VD->getType()->isReferenceType() &&
2652 !isBlockByref;
2653 if (NonGCable) {
2654 LV.getQuals().removeObjCGCAttr();
2655 LV.setNonGC(true);
2656 }
2657
2658 bool isImpreciseLifetime =
2659 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2660 if (isImpreciseLifetime)
2661 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2662 setObjCGCLValueClass(getContext(), E, LV);
2663 return LV;
2664 }
2665
2666 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2667 return EmitFunctionDeclLValue(*this, E, FD);
2668
2669 // FIXME: While we're emitting a binding from an enclosing scope, all other
2670 // DeclRefExprs we see should be implicitly treated as if they also refer to
2671 // an enclosing scope.
2672 if (const auto *BD = dyn_cast<BindingDecl>(ND))
2673 return EmitLValue(BD->getBinding());
2674
2675 llvm_unreachable("Unhandled DeclRefExpr")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2675)
;
2676}
2677
2678LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2679 // __extension__ doesn't affect lvalue-ness.
2680 if (E->getOpcode() == UO_Extension)
2681 return EmitLValue(E->getSubExpr());
2682
2683 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2684 switch (E->getOpcode()) {
2685 default: llvm_unreachable("Unknown unary operator lvalue!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2685)
;
2686 case UO_Deref: {
2687 QualType T = E->getSubExpr()->getType()->getPointeeType();
2688 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2688, __PRETTY_FUNCTION__))
;
2689
2690 LValueBaseInfo BaseInfo;
2691 TBAAAccessInfo TBAAInfo;
2692 Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
2693 &TBAAInfo);
2694 LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
2695 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2696
2697 // We should not generate __weak write barrier on indirect reference
2698 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2699 // But, we continue to generate __strong write barrier on indirect write
2700 // into a pointer to object.
2701 if (getLangOpts().ObjC &&
2702 getLangOpts().getGC() != LangOptions::NonGC &&
2703 LV.isObjCWeak())
2704 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2705 return LV;
2706 }
2707 case UO_Real:
2708 case UO_Imag: {
2709 LValue LV = EmitLValue(E->getSubExpr());
2710 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2710, __PRETTY_FUNCTION__))
;
2711
2712 // __real is valid on scalars. This is a faster way of testing that.
2713 // __imag can only produce an rvalue on scalars.
2714 if (E->getOpcode() == UO_Real &&
2715 !LV.getAddress().getElementType()->isStructTy()) {
2716 assert(E->getSubExpr()->getType()->isArithmeticType())((E->getSubExpr()->getType()->isArithmeticType()) ? static_cast
<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2716, __PRETTY_FUNCTION__))
;
2717 return LV;
2718 }
2719
2720 QualType T = ExprTy->castAs<ComplexType>()->getElementType();
2721
2722 Address Component =
2723 (E->getOpcode() == UO_Real
2724 ? emitAddrOfRealComponent(LV.getAddress(), LV.getType())
2725 : emitAddrOfImagComponent(LV.getAddress(), LV.getType()));
2726 LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
2727 CGM.getTBAAInfoForSubobject(LV, T));
2728 ElemLV.getQuals().addQualifiers(LV.getQuals());
2729 return ElemLV;
2730 }
2731 case UO_PreInc:
2732 case UO_PreDec: {
2733 LValue LV = EmitLValue(E->getSubExpr());
2734 bool isInc = E->getOpcode() == UO_PreInc;
2735
2736 if (E->getType()->isAnyComplexType())
2737 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2738 else
2739 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2740 return LV;
2741 }
2742 }
2743}
2744
2745LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2746 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2747 E->getType(), AlignmentSource::Decl);
2748}
2749
2750LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2751 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2752 E->getType(), AlignmentSource::Decl);
2753}
2754
2755LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2756 auto SL = E->getFunctionName();
2757 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2757, __PRETTY_FUNCTION__))
;
2758 StringRef FnName = CurFn->getName();
2759 if (FnName.startswith("\01"))
2760 FnName = FnName.substr(1);
2761 StringRef NameItems[] = {
2762 PredefinedExpr::getIdentKindName(E->getIdentKind()), FnName};
2763 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2764 if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
2765 std::string Name = SL->getString();
2766 if (!Name.empty()) {
2767 unsigned Discriminator =
2768 CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
2769 if (Discriminator)
2770 Name += "_" + Twine(Discriminator + 1).str();
2771 auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
2772 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2773 } else {
2774 auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str());
2775 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2776 }
2777 }
2778 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2779 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2780}
2781
2782/// Emit a type description suitable for use by a runtime sanitizer library. The
2783/// format of a type descriptor is
2784///
2785/// \code
2786/// { i16 TypeKind, i16 TypeInfo }
2787/// \endcode
2788///
2789/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2790/// integer, 1 for a floating point value, and -1 for anything else.
2791llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2792 // Only emit each type's descriptor once.
2793 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2794 return C;
2795
2796 uint16_t TypeKind = -1;
2797 uint16_t TypeInfo = 0;
2798
2799 if (T->isIntegerType()) {
2800 TypeKind = 0;
2801 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2802 (T->isSignedIntegerType() ? 1 : 0);
2803 } else if (T->isFloatingType()) {
2804 TypeKind = 1;
2805 TypeInfo = getContext().getTypeSize(T);
2806 }
2807
2808 // Format the type name as if for a diagnostic, including quotes and
2809 // optionally an 'aka'.
2810 SmallString<32> Buffer;
2811 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2812 (intptr_t)T.getAsOpaquePtr(),
2813 StringRef(), StringRef(), None, Buffer,
2814 None);
2815
2816 llvm::Constant *Components[] = {
2817 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2818 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2819 };
2820 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2821
2822 auto *GV = new llvm::GlobalVariable(
2823 CGM.getModule(), Descriptor->getType(),
2824 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2825 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2826 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2827
2828 // Remember the descriptor for this type.
2829 CGM.setTypeDescriptorInMap(T, GV);
2830
2831 return GV;
2832}
2833
2834llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2835 llvm::Type *TargetTy = IntPtrTy;
2836
2837 if (V->getType() == TargetTy)
2838 return V;
2839
2840 // Floating-point types which fit into intptr_t are bitcast to integers
2841 // and then passed directly (after zero-extension, if necessary).
2842 if (V->getType()->isFloatingPointTy()) {
2843 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2844 if (Bits <= TargetTy->getIntegerBitWidth())
2845 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2846 Bits));
2847 }
2848
2849 // Integers which fit in intptr_t are zero-extended and passed directly.
2850 if (V->getType()->isIntegerTy() &&
2851 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2852 return Builder.CreateZExt(V, TargetTy);
2853
2854 // Pointers are passed directly, everything else is passed by address.
2855 if (!V->getType()->isPointerTy()) {
2856 Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
2857 Builder.CreateStore(V, Ptr);
2858 V = Ptr.getPointer();
2859 }
2860 return Builder.CreatePtrToInt(V, TargetTy);
2861}
2862
2863/// Emit a representation of a SourceLocation for passing to a handler
2864/// in a sanitizer runtime library. The format for this data is:
2865/// \code
2866/// struct SourceLocation {
2867/// const char *Filename;
2868/// int32_t Line, Column;
2869/// };
2870/// \endcode
2871/// For an invalid SourceLocation, the Filename pointer is null.
2872llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
2873 llvm::Constant *Filename;
2874 int Line, Column;
2875
2876 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
2877 if (PLoc.isValid()) {
2878 StringRef FilenameString = PLoc.getFilename();
2879
2880 int PathComponentsToStrip =
2881 CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
2882 if (PathComponentsToStrip < 0) {
2883 assert(PathComponentsToStrip != INT_MIN)((PathComponentsToStrip != (-2147483647 -1)) ? static_cast<
void> (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2883, __PRETTY_FUNCTION__))
;
2884 int PathComponentsToKeep = -PathComponentsToStrip;
2885 auto I = llvm::sys::path::rbegin(FilenameString);
2886 auto E = llvm::sys::path::rend(FilenameString);
2887 while (I != E && --PathComponentsToKeep)
2888 ++I;
2889
2890 FilenameString = FilenameString.substr(I - E);
2891 } else if (PathComponentsToStrip > 0) {
2892 auto I = llvm::sys::path::begin(FilenameString);
2893 auto E = llvm::sys::path::end(FilenameString);
2894 while (I != E && PathComponentsToStrip--)
2895 ++I;
2896
2897 if (I != E)
2898 FilenameString =
2899 FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
2900 else
2901 FilenameString = llvm::sys::path::filename(FilenameString);
2902 }
2903
2904 auto FilenameGV = CGM.GetAddrOfConstantCString(FilenameString, ".src");
2905 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
2906 cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
2907 Filename = FilenameGV.getPointer();
2908 Line = PLoc.getLine();
2909 Column = PLoc.getColumn();
2910 } else {
2911 Filename = llvm::Constant::getNullValue(Int8PtrTy);
2912 Line = Column = 0;
2913 }
2914
2915 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
2916 Builder.getInt32(Column)};
2917
2918 return llvm::ConstantStruct::getAnon(Data);
2919}
2920
2921namespace {
2922/// Specify under what conditions this check can be recovered
2923enum class CheckRecoverableKind {
2924 /// Always terminate program execution if this check fails.
2925 Unrecoverable,
2926 /// Check supports recovering, runtime has both fatal (noreturn) and
2927 /// non-fatal handlers for this check.
2928 Recoverable,
2929 /// Runtime conditionally aborts, always need to support recovery.
2930 AlwaysRecoverable
2931};
2932}
2933
2934static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
2935 assert(Kind.countPopulation() == 1)((Kind.countPopulation() == 1) ? static_cast<void> (0) :
__assert_fail ("Kind.countPopulation() == 1", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2935, __PRETTY_FUNCTION__))
;
2936 if (Kind == SanitizerKind::Function || Kind == SanitizerKind::Vptr)
2937 return CheckRecoverableKind::AlwaysRecoverable;
2938 else if (Kind == SanitizerKind::Return || Kind == SanitizerKind::Unreachable)
2939 return CheckRecoverableKind::Unrecoverable;
2940 else
2941 return CheckRecoverableKind::Recoverable;
2942}
2943
2944namespace {
2945struct SanitizerHandlerInfo {
2946 char const *const Name;
2947 unsigned Version;
2948};
2949}
2950
2951const SanitizerHandlerInfo SanitizerHandlers[] = {
2952#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
2953 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
(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)
2954#undef SANITIZER_CHECK
2955};
2956
2957static void emitCheckHandlerCall(CodeGenFunction &CGF,
2958 llvm::FunctionType *FnType,
2959 ArrayRef<llvm::Value *> FnArgs,
2960 SanitizerHandler CheckHandler,
2961 CheckRecoverableKind RecoverKind, bool IsFatal,
2962 llvm::BasicBlock *ContBB) {
2963 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable)((IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable
) ? static_cast<void> (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 2963, __PRETTY_FUNCTION__))
;
2964 Optional<ApplyDebugLocation> DL;
2965 if (!CGF.Builder.getCurrentDebugLocation()) {
2966 // Ensure that the call has at least an artificial debug location.
2967 DL.emplace(CGF, SourceLocation());
2968 }
2969 bool NeedsAbortSuffix =
2970 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
2971 bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
2972 const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
2973 const StringRef CheckName = CheckInfo.Name;
2974 std::string FnName = "__ubsan_handle_" + CheckName.str();
2975 if (CheckInfo.Version && !MinimalRuntime)
2976 FnName += "_v" + llvm::utostr(CheckInfo.Version);
2977 if (MinimalRuntime)
2978 FnName += "_minimal";
2979 if (NeedsAbortSuffix)
2980 FnName += "_abort";
2981 bool MayReturn =
2982 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
2983
2984 llvm::AttrBuilder B;
2985 if (!MayReturn) {
2986 B.addAttribute(llvm::Attribute::NoReturn)
2987 .addAttribute(llvm::Attribute::NoUnwind);
2988 }
2989 B.addAttribute(llvm::Attribute::UWTable);
2990
2991 llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
2992 FnType, FnName,
2993 llvm::AttributeList::get(CGF.getLLVMContext(),
2994 llvm::AttributeList::FunctionIndex, B),
2995 /*Local=*/true);
2996 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
2997 if (!MayReturn) {
2998 HandlerCall->setDoesNotReturn();
2999 CGF.Builder.CreateUnreachable();
3000 } else {
3001 CGF.Builder.CreateBr(ContBB);
3002 }
3003}
3004
3005void CodeGenFunction::EmitCheck(
3006 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
3007 SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
3008 ArrayRef<llvm::Value *> DynamicArgs) {
3009 assert(IsSanitizerScope)((IsSanitizerScope) ? static_cast<void> (0) : __assert_fail
("IsSanitizerScope", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3009, __PRETTY_FUNCTION__))
;
3010 assert(Checked.size() > 0)((Checked.size() > 0) ? static_cast<void> (0) : __assert_fail
("Checked.size() > 0", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3010, __PRETTY_FUNCTION__))
;
3011 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3012, __PRETTY_FUNCTION__))
3012 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3012, __PRETTY_FUNCTION__))
;
3013 const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
3014
3015 llvm::Value *FatalCond = nullptr;
3016 llvm::Value *RecoverableCond = nullptr;
3017 llvm::Value *TrapCond = nullptr;
3018 for (int i = 0, n = Checked.size(); i < n; ++i) {
3019 llvm::Value *Check = Checked[i].first;
3020 // -fsanitize-trap= overrides -fsanitize-recover=.
3021 llvm::Value *&Cond =
3022 CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
3023 ? TrapCond
3024 : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
3025 ? RecoverableCond
3026 : FatalCond;
3027 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
3028 }
3029
3030 if (TrapCond)
3031 EmitTrapCheck(TrapCond);
3032 if (!FatalCond && !RecoverableCond)
3033 return;
3034
3035 llvm::Value *JointCond;
3036 if (FatalCond && RecoverableCond)
3037 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
3038 else
3039 JointCond = FatalCond ? FatalCond : RecoverableCond;
3040 assert(JointCond)((JointCond) ? static_cast<void> (0) : __assert_fail ("JointCond"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3040, __PRETTY_FUNCTION__))
;
3041
3042 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
3043 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3043, __PRETTY_FUNCTION__))
;
3044#ifndef NDEBUG
3045 for (int i = 1, n = Checked.size(); i < n; ++i) {
3046 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3047, __PRETTY_FUNCTION__))
3047 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3047, __PRETTY_FUNCTION__))
;
3048 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3048, __PRETTY_FUNCTION__))
;
3049 }
3050#endif
3051
3052 llvm::BasicBlock *Cont = createBasicBlock("cont");
3053 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
3054 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
3055 // Give hint that we very much don't expect to execute the handler
3056 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
3057 llvm::MDBuilder MDHelper(getLLVMContext());
3058 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3059 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
3060 EmitBlock(Handlers);
3061
3062 // Handler functions take an i8* pointing to the (handler-specific) static
3063 // information block, followed by a sequence of intptr_t arguments
3064 // representing operand values.
3065 SmallVector<llvm::Value *, 4> Args;
3066 SmallVector<llvm::Type *, 4> ArgTypes;
3067 if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
3068 Args.reserve(DynamicArgs.size() + 1);
3069 ArgTypes.reserve(DynamicArgs.size() + 1);
3070
3071 // Emit handler arguments and create handler function type.
3072 if (!StaticArgs.empty()) {
3073 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3074 auto *InfoPtr =
3075 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3076 llvm::GlobalVariable::PrivateLinkage, Info);
3077 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3078 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3079 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
3080 ArgTypes.push_back(Int8PtrTy);
3081 }
3082
3083 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
3084 Args.push_back(EmitCheckValue(DynamicArgs[i]));
3085 ArgTypes.push_back(IntPtrTy);
3086 }
3087 }
3088
3089 llvm::FunctionType *FnType =
3090 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
3091
3092 if (!FatalCond || !RecoverableCond) {
3093 // Simple case: we need to generate a single handler call, either
3094 // fatal, or non-fatal.
3095 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
3096 (FatalCond != nullptr), Cont);
3097 } else {
3098 // Emit two handler calls: first one for set of unrecoverable checks,
3099 // another one for recoverable.
3100 llvm::BasicBlock *NonFatalHandlerBB =
3101 createBasicBlock("non_fatal." + CheckName);
3102 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
3103 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
3104 EmitBlock(FatalHandlerBB);
3105 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
3106 NonFatalHandlerBB);
3107 EmitBlock(NonFatalHandlerBB);
3108 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
3109 Cont);
3110 }
3111
3112 EmitBlock(Cont);
3113}
3114
3115void CodeGenFunction::EmitCfiSlowPathCheck(
3116 SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
3117 llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
3118 llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
3119
3120 llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
3121 llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
3122
3123 llvm::MDBuilder MDHelper(getLLVMContext());
3124 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3125 BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
3126
3127 EmitBlock(CheckBB);
3128
3129 bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
3130
3131 llvm::CallInst *CheckCall;
3132 llvm::FunctionCallee SlowPathFn;
3133 if (WithDiag) {
3134 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3135 auto *InfoPtr =
3136 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3137 llvm::GlobalVariable::PrivateLinkage, Info);
3138 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3139 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3140
3141 SlowPathFn = CGM.getModule().getOrInsertFunction(
3142 "__cfi_slowpath_diag",
3143 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
3144 false));
3145 CheckCall = Builder.CreateCall(
3146 SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
3147 } else {
3148 SlowPathFn = CGM.getModule().getOrInsertFunction(
3149 "__cfi_slowpath",
3150 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
3151 CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
3152 }
3153
3154 CGM.setDSOLocal(
3155 cast<llvm::GlobalValue>(SlowPathFn.getCallee()->stripPointerCasts()));
3156 CheckCall->setDoesNotThrow();
3157
3158 EmitBlock(Cont);
3159}
3160
3161// Emit a stub for __cfi_check function so that the linker knows about this
3162// symbol in LTO mode.
3163void CodeGenFunction::EmitCfiCheckStub() {
3164 llvm::Module *M = &CGM.getModule();
3165 auto &Ctx = M->getContext();
3166 llvm::Function *F = llvm::Function::Create(
3167 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
3168 llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
3169 CGM.setDSOLocal(F);
3170 llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
3171 // FIXME: consider emitting an intrinsic call like
3172 // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
3173 // which can be lowered in CrossDSOCFI pass to the actual contents of
3174 // __cfi_check. This would allow inlining of __cfi_check calls.
3175 llvm::CallInst::Create(
3176 llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
3177 llvm::ReturnInst::Create(Ctx, nullptr, BB);
3178}
3179
3180// This function is basically a switch over the CFI failure kind, which is
3181// extracted from CFICheckFailData (1st function argument). Each case is either
3182// llvm.trap or a call to one of the two runtime handlers, based on
3183// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
3184// failure kind) traps, but this should really never happen. CFICheckFailData
3185// can be nullptr if the calling module has -fsanitize-trap behavior for this
3186// check kind; in this case __cfi_check_fail traps as well.
3187void CodeGenFunction::EmitCfiCheckFail() {
3188 SanitizerScope SanScope(this);
3189 FunctionArgList Args;
3190 ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
3191 ImplicitParamDecl::Other);
3192 ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
3193 ImplicitParamDecl::Other);
3194 Args.push_back(&ArgData);
3195 Args.push_back(&ArgAddr);
3196
3197 const CGFunctionInfo &FI =
3198 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
3199
3200 llvm::Function *F = llvm::Function::Create(
3201 llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
3202 llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
3203 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
3204
3205 StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
3206 SourceLocation());
3207
3208 // This function should not be affected by blacklist. This function does
3209 // not have a source location, but "src:*" would still apply. Revert any
3210 // changes to SanOpts made in StartFunction.
3211 SanOpts = CGM.getLangOpts().Sanitize;
3212
3213 llvm::Value *Data =
3214 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
3215 CGM.getContext().VoidPtrTy, ArgData.getLocation());
3216 llvm::Value *Addr =
3217 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
3218 CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
3219
3220 // Data == nullptr means the calling module has trap behaviour for this check.
3221 llvm::Value *DataIsNotNullPtr =
3222 Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
3223 EmitTrapCheck(DataIsNotNullPtr);
3224
3225 llvm::StructType *SourceLocationTy =
3226 llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
3227 llvm::StructType *CfiCheckFailDataTy =
3228 llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
3229
3230 llvm::Value *V = Builder.CreateConstGEP2_32(
3231 CfiCheckFailDataTy,
3232 Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
3233 0);
3234 Address CheckKindAddr(V, getIntAlign());
3235 llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
3236
3237 llvm::Value *AllVtables = llvm::MetadataAsValue::get(
3238 CGM.getLLVMContext(),
3239 llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
3240 llvm::Value *ValidVtable = Builder.CreateZExt(
3241 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
3242 {Addr, AllVtables}),
3243 IntPtrTy);
3244
3245 const std::pair<int, SanitizerMask> CheckKinds[] = {
3246 {CFITCK_VCall, SanitizerKind::CFIVCall},
3247 {CFITCK_NVCall, SanitizerKind::CFINVCall},
3248 {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
3249 {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
3250 {CFITCK_ICall, SanitizerKind::CFIICall}};
3251
3252 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
3253 for (auto CheckKindMaskPair : CheckKinds) {
3254 int Kind = CheckKindMaskPair.first;
3255 SanitizerMask Mask = CheckKindMaskPair.second;
3256 llvm::Value *Cond =
3257 Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
3258 if (CGM.getLangOpts().Sanitize.has(Mask))
3259 EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
3260 {Data, Addr, ValidVtable});
3261 else
3262 EmitTrapCheck(Cond);
3263 }
3264
3265 FinishFunction();
3266 // The only reference to this function will be created during LTO link.
3267 // Make sure it survives until then.
3268 CGM.addUsedGlobal(F);
3269}
3270
3271void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
3272 if (SanOpts.has(SanitizerKind::Unreachable)) {
3273 SanitizerScope SanScope(this);
3274 EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
3275 SanitizerKind::Unreachable),
3276 SanitizerHandler::BuiltinUnreachable,
3277 EmitCheckSourceLocation(Loc), None);
3278 }
3279 Builder.CreateUnreachable();
3280}
3281
3282void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
3283 llvm::BasicBlock *Cont = createBasicBlock("cont");
3284
3285 // If we're optimizing, collapse all calls to trap down to just one per
3286 // function to save on code size.
3287 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
3288 TrapBB = createBasicBlock("trap");
3289 Builder.CreateCondBr(Checked, Cont, TrapBB);
3290 EmitBlock(TrapBB);
3291 llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
3292 TrapCall->setDoesNotReturn();
3293 TrapCall->setDoesNotThrow();
3294 Builder.CreateUnreachable();
3295 } else {
3296 Builder.CreateCondBr(Checked, Cont, TrapBB);
3297 }
3298
3299 EmitBlock(Cont);
3300}
3301
3302llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
3303 llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
3304
3305 if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
3306 auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
3307 CGM.getCodeGenOpts().TrapFuncName);
3308 TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
3309 }
3310
3311 return TrapCall;
3312}
3313
3314Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
3315 LValueBaseInfo *BaseInfo,
3316 TBAAAccessInfo *TBAAInfo) {
3317 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3318, __PRETTY_FUNCTION__))
3318 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3318, __PRETTY_FUNCTION__))
;
3319
3320 // Expressions of array type can't be bitfields or vector elements.
3321 LValue LV = EmitLValue(E);
3322 Address Addr = LV.getAddress();
3323
3324 // If the array type was an incomplete type, we need to make sure
3325 // the decay ends up being the right type.
3326 llvm::Type *NewTy = ConvertType(E->getType());
3327 Addr = Builder.CreateElementBitCast(Addr, NewTy);
3328
3329 // Note that VLA pointers are always decayed, so we don't need to do
3330 // anything here.
3331 if (!E->getType()->isVariableArrayType()) {
3332 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3333, __PRETTY_FUNCTION__))
3333 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3333, __PRETTY_FUNCTION__))
;
3334 Addr = Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3335 }
3336
3337 // The result of this decay conversion points to an array element within the
3338 // base lvalue. However, since TBAA currently does not support representing
3339 // accesses to elements of member arrays, we conservatively represent accesses
3340 // to the pointee object as if it had no any base lvalue specified.
3341 // TODO: Support TBAA for member arrays.
3342 QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
3343 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
3344 if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
3345
3346 return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
3347}
3348
3349/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3350/// array to pointer, return the array subexpression.
3351static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
3352 // If this isn't just an array->pointer decay, bail out.
3353 const auto *CE = dyn_cast<CastExpr>(E);
3354 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
3355 return nullptr;
3356
3357 // If this is a decay from variable width array, bail out.
3358 const Expr *SubExpr = CE->getSubExpr();
3359 if (SubExpr->getType()->isVariableArrayType())
3360 return nullptr;
3361
3362 return SubExpr;
3363}
3364
3365static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
3366 llvm::Value *ptr,
3367 ArrayRef<llvm::Value*> indices,
3368 bool inbounds,
3369 bool signedIndices,
3370 SourceLocation loc,
3371 const llvm::Twine &name = "arrayidx") {
3372 if (inbounds) {
3373 return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
3374 CodeGenFunction::NotSubtraction, loc,
3375 name);
3376 } else {
3377 return CGF.Builder.CreateGEP(ptr, indices, name);
3378 }
3379}
3380
3381static CharUnits getArrayElementAlign(CharUnits arrayAlign,
3382 llvm::Value *idx,
3383 CharUnits eltSize) {
3384 // If we have a constant index, we can use the exact offset of the
3385 // element we're accessing.
3386 if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
3387 CharUnits offset = constantIdx->getZExtValue() * eltSize;
3388 return arrayAlign.alignmentAtOffset(offset);
3389
3390 // Otherwise, use the worst-case alignment for any element.
3391 } else {
3392 return arrayAlign.alignmentOfArrayElement(eltSize);
3393 }
3394}
3395
3396static QualType getFixedSizeElementType(const ASTContext &ctx,
3397 const VariableArrayType *vla) {
3398 QualType eltType;
3399 do {
3400 eltType = vla->getElementType();
3401 } while ((vla = ctx.getAsVariableArrayType(eltType)));
3402 return eltType;
3403}
3404
3405static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
3406 ArrayRef<llvm::Value *> indices,
3407 QualType eltType, bool inbounds,
3408 bool signedIndices, SourceLocation loc,
3409 QualType *arrayType = nullptr,
3410 const llvm::Twine &name = "arrayidx") {
3411 // All the indices except that last must be zero.
3412#ifndef NDEBUG
3413 for (auto idx : indices.drop_back())
3414 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3415, __PRETTY_FUNCTION__))
3415 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3415, __PRETTY_FUNCTION__))
;
3416#endif
3417
3418 // Determine the element size of the statically-sized base. This is
3419 // the thing that the indices are expressed in terms of.
3420 if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
3421 eltType = getFixedSizeElementType(CGF.getContext(), vla);
3422 }
3423
3424 // We can use that to compute the best alignment of the element.
3425 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
3426 CharUnits eltAlign =
3427 getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
3428
3429 llvm::Value *eltPtr;
3430 auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
3431 if (!CGF.IsInPreservedAIRegion || !LastIndex) {
3432 eltPtr = emitArraySubscriptGEP(
3433 CGF, addr.getPointer(), indices, inbounds, signedIndices,
3434 loc, name);
3435 } else {
3436 // Remember the original array subscript for bpf target
3437 unsigned idx = LastIndex->getZExtValue();
3438 llvm::DIType *DbgInfo = nullptr;
3439 if (arrayType)
3440 DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(*arrayType, loc);
3441 eltPtr = CGF.Builder.CreatePreserveArrayAccessIndex(addr.getElementType(),
3442 addr.getPointer(),
3443 indices.size() - 1,
3444 idx, DbgInfo);
3445 }
3446
3447 return Address(eltPtr, eltAlign);
3448}
3449
3450LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3451 bool Accessed) {
3452 // The index must always be an integer, which is not an aggregate. Emit it
3453 // in lexical order (this complexity is, sadly, required by C++17).
3454 llvm::Value *IdxPre =
3455 (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
3456 bool SignedIndices = false;
3457 auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
3458 auto *Idx = IdxPre;
3459 if (E->getLHS() != E->getIdx()) {
3460 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3460, __PRETTY_FUNCTION__))
;
3461 Idx = EmitScalarExpr(E->getIdx());
3462 }
3463
3464 QualType IdxTy = E->getIdx()->getType();
3465 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
3466 SignedIndices |= IdxSigned;
3467
3468 if (SanOpts.has(SanitizerKind::ArrayBounds))
3469 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
3470
3471 // Extend or truncate the index type to 32 or 64-bits.
3472 if (Promote && Idx->getType() != IntPtrTy)
3473 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
3474
3475 return Idx;
3476 };
3477 IdxPre = nullptr;
3478
3479 // If the base is a vector type, then we are forming a vector element lvalue
3480 // with this subscript.
3481 if (E->getBase()->getType()->isVectorType() &&
3482 !isa<ExtVectorElementExpr>(E->getBase())) {
3483 // Emit the vector as an lvalue to get its address.
3484 LValue LHS = EmitLValue(E->getBase());
3485 auto *Idx = EmitIdxAfterBase(/*Promote*/false);
3486 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3486, __PRETTY_FUNCTION__))
;
3487 return LValue::MakeVectorElt(LHS.getAddress(), Idx, E->getBase()->getType(),
3488 LHS.getBaseInfo(), TBAAAccessInfo());
3489 }
3490
3491 // All the other cases basically behave like simple offsetting.
3492
3493 // Handle the extvector case we ignored above.
3494 if (isa<ExtVectorElementExpr>(E->getBase())) {
3495 LValue LV = EmitLValue(E->getBase());
3496 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3497 Address Addr = EmitExtVectorElementLValue(LV);
3498
3499 QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
3500 Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
3501 SignedIndices, E->getExprLoc());
3502 return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
3503 CGM.getTBAAInfoForSubobject(LV, EltType));
3504 }
3505
3506 LValueBaseInfo EltBaseInfo;
3507 TBAAAccessInfo EltTBAAInfo;
3508 Address Addr = Address::invalid();
3509 if (const VariableArrayType *vla =
3510 getContext().getAsVariableArrayType(E->getType())) {
3511 // The base must be a pointer, which is not an aggregate. Emit
3512 // it. It needs to be emitted first in case it's what captures
3513 // the VLA bounds.
3514 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3515 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3516
3517 // The element count here is the total number of non-VLA elements.
3518 llvm::Value *numElements = getVLASize(vla).NumElts;
3519
3520 // Effectively, the multiply by the VLA size is part of the GEP.
3521 // GEP indexes are signed, and scaling an index isn't permitted to
3522 // signed-overflow, so we use the same semantics for our explicit
3523 // multiply. We suppress this if overflow is not undefined behavior.
3524 if (getLangOpts().isSignedOverflowDefined()) {
3525 Idx = Builder.CreateMul(Idx, numElements);
3526 } else {
3527 Idx = Builder.CreateNSWMul(Idx, numElements);
3528 }
3529
3530 Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
3531 !getLangOpts().isSignedOverflowDefined(),
3532 SignedIndices, E->getExprLoc());
3533
3534 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
3535 // Indexing over an interface, as in "NSString *P; P[4];"
3536
3537 // Emit the base pointer.
3538 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3539 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3540
3541 CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
3542 llvm::Value *InterfaceSizeVal =
3543 llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
3544
3545 llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
3546
3547 // We don't necessarily build correct LLVM struct types for ObjC
3548 // interfaces, so we can't rely on GEP to do this scaling
3549 // correctly, so we need to cast to i8*. FIXME: is this actually
3550 // true? A lot of other things in the fragile ABI would break...
3551 llvm::Type *OrigBaseTy = Addr.getType();
3552 Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
3553
3554 // Do the GEP.
3555 CharUnits EltAlign =
3556 getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
3557 llvm::Value *EltPtr =
3558 emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
3559 SignedIndices, E->getExprLoc());
3560 Addr = Address(EltPtr, EltAlign);
3561
3562 // Cast back.
3563 Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
3564 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3565 // If this is A[i] where A is an array, the frontend will have decayed the
3566 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3567 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3568 // "gep x, i" here. Emit one "gep A, 0, i".
3569 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3570, __PRETTY_FUNCTION__))
3570 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3570, __PRETTY_FUNCTION__))
;
3571 LValue ArrayLV;
3572 // For simple multidimensional array indexing, set the 'accessed' flag for
3573 // better bounds-checking of the base expression.
3574 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3575 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3576 else
3577 ArrayLV = EmitLValue(Array);
3578 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3579
3580 // Propagate the alignment from the array itself to the result.
3581 QualType arrayType = Array->getType();
3582 Addr = emitArraySubscriptGEP(
3583 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3584 E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
3585 E->getExprLoc(), &arrayType);
3586 EltBaseInfo = ArrayLV.getBaseInfo();
3587 EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
3588 } else {
3589 // The base must be a pointer; emit it with an estimate of its alignment.
3590 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3591 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3592 QualType ptrType = E->getBase()->getType();
3593 Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
3594 !getLangOpts().isSignedOverflowDefined(),
3595 SignedIndices, E->getExprLoc(), &ptrType);
3596 }
3597
3598 LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
3599
3600 if (getLangOpts().ObjC &&
3601 getLangOpts().getGC() != LangOptions::NonGC) {
3602 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
3603 setObjCGCLValueClass(getContext(), E, LV);
3604 }
3605 return LV;
3606}
3607
3608static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
3609 LValueBaseInfo &BaseInfo,
3610 TBAAAccessInfo &TBAAInfo,
3611 QualType BaseTy, QualType ElTy,
3612 bool IsLowerBound) {
3613 LValue BaseLVal;
3614 if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
3615 BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
3616 if (BaseTy->isArrayType()) {
3617 Address Addr = BaseLVal.getAddress();
3618 BaseInfo = BaseLVal.getBaseInfo();
3619
3620 // If the array type was an incomplete type, we need to make sure
3621 // the decay ends up being the right type.
3622 llvm::Type *NewTy = CGF.ConvertType(BaseTy);
3623 Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
3624
3625 // Note that VLA pointers are always decayed, so we don't need to do
3626 // anything here.
3627 if (!BaseTy->isVariableArrayType()) {
3628 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3629, __PRETTY_FUNCTION__))
3629 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3629, __PRETTY_FUNCTION__))
;
3630 Addr = CGF.Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3631 }
3632
3633 return CGF.Builder.CreateElementBitCast(Addr,
3634 CGF.ConvertTypeForMem(ElTy));
3635 }
3636 LValueBaseInfo TypeBaseInfo;
3637 TBAAAccessInfo TypeTBAAInfo;
3638 CharUnits Align = CGF.getNaturalTypeAlignment(ElTy, &TypeBaseInfo,
3639 &TypeTBAAInfo);
3640 BaseInfo.mergeForCast(TypeBaseInfo);
3641 TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
3642 return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress()), Align);
3643 }
3644 return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3645}
3646
3647LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3648 bool IsLowerBound) {
3649 QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
3650 QualType ResultExprTy;
3651 if (auto *AT = getContext().getAsArrayType(BaseTy))
3652 ResultExprTy = AT->getElementType();
3653 else
3654 ResultExprTy = BaseTy->getPointeeType();
3655 llvm::Value *Idx = nullptr;
3656 if (IsLowerBound || E->getColonLoc().isInvalid()) {
3657 // Requesting lower bound or upper bound, but without provided length and
3658 // without ':' symbol for the default length -> length = 1.
3659 // Idx = LowerBound ?: 0;
3660 if (auto *LowerBound = E->getLowerBound()) {
3661 Idx = Builder.CreateIntCast(
3662 EmitScalarExpr(LowerBound), IntPtrTy,
3663 LowerBound->getType()->hasSignedIntegerRepresentation());
3664 } else
3665 Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
3666 } else {
3667 // Try to emit length or lower bound as constant. If this is possible, 1
3668 // is subtracted from constant length or lower bound. Otherwise, emit LLVM
3669 // IR (LB + Len) - 1.
3670 auto &C = CGM.getContext();
3671 auto *Length = E->getLength();
3672 llvm::APSInt ConstLength;
3673 if (Length) {
3674 // Idx = LowerBound + Length - 1;
3675 if (Length->isIntegerConstantExpr(ConstLength, C)) {
3676 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3677 Length = nullptr;
3678 }
3679 auto *LowerBound = E->getLowerBound();
3680 llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
3681 if (LowerBound && LowerBound->isIntegerConstantExpr(ConstLowerBound, C)) {
3682 ConstLowerBound = ConstLowerBound.zextOrTrunc(PointerWidthInBits);
3683 LowerBound = nullptr;
3684 }
3685 if (!Length)
3686 --ConstLength;
3687 else if (!LowerBound)
3688 --ConstLowerBound;
3689
3690 if (Length || LowerBound) {
3691 auto *LowerBoundVal =
3692 LowerBound
3693 ? Builder.CreateIntCast(
3694 EmitScalarExpr(LowerBound), IntPtrTy,
3695 LowerBound->getType()->hasSignedIntegerRepresentation())
3696 : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
3697 auto *LengthVal =
3698 Length
3699 ? Builder.CreateIntCast(
3700 EmitScalarExpr(Length), IntPtrTy,
3701 Length->getType()->hasSignedIntegerRepresentation())
3702 : llvm::ConstantInt::get(IntPtrTy, ConstLength);
3703 Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
3704 /*HasNUW=*/false,
3705 !getLangOpts().isSignedOverflowDefined());
3706 if (Length && LowerBound) {
3707 Idx = Builder.CreateSub(
3708 Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
3709 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3710 }
3711 } else
3712 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
3713 } else {
3714 // Idx = ArraySize - 1;
3715 QualType ArrayTy = BaseTy->isPointerType()
3716 ? E->getBase()->IgnoreParenImpCasts()->getType()
3717 : BaseTy;
3718 if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
3719 Length = VAT->getSizeExpr();
3720 if (Length->isIntegerConstantExpr(ConstLength, C))
3721 Length = nullptr;
3722 } else {
3723 auto *CAT = C.getAsConstantArrayType(ArrayTy);
3724 ConstLength = CAT->getSize();
3725 }
3726 if (Length) {
3727 auto *LengthVal = Builder.CreateIntCast(
3728 EmitScalarExpr(Length), IntPtrTy,
3729 Length->getType()->hasSignedIntegerRepresentation());
3730 Idx = Builder.CreateSub(
3731 LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
3732 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3733 } else {
3734 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3735 --ConstLength;
3736 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
3737 }
3738 }
3739 }
3740 assert(Idx)((Idx) ? static_cast<void> (0) : __assert_fail ("Idx", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3740, __PRETTY_FUNCTION__))
;
3741
3742 Address EltPtr = Address::invalid();
3743 LValueBaseInfo BaseInfo;
3744 TBAAAccessInfo TBAAInfo;
3745 if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
3746 // The base must be a pointer, which is not an aggregate. Emit
3747 // it. It needs to be emitted first in case it's what captures
3748 // the VLA bounds.
3749 Address Base =
3750 emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
3751 BaseTy, VLA->getElementType(), IsLowerBound);
3752 // The element count here is the total number of non-VLA elements.
3753 llvm::Value *NumElements = getVLASize(VLA).NumElts;
3754
3755 // Effectively, the multiply by the VLA size is part of the GEP.
3756 // GEP indexes are signed, and scaling an index isn't permitted to
3757 // signed-overflow, so we use the same semantics for our explicit
3758 // multiply. We suppress this if overflow is not undefined behavior.
3759 if (getLangOpts().isSignedOverflowDefined())
3760 Idx = Builder.CreateMul(Idx, NumElements);
3761 else
3762 Idx = Builder.CreateNSWMul(Idx, NumElements);
3763 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
3764 !getLangOpts().isSignedOverflowDefined(),
3765 /*signedIndices=*/false, E->getExprLoc());
3766 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3767 // If this is A[i] where A is an array, the frontend will have decayed the
3768 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3769 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3770 // "gep x, i" here. Emit one "gep A, 0, i".
3771 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3772, __PRETTY_FUNCTION__))
3772 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3772, __PRETTY_FUNCTION__))
;
3773 LValue ArrayLV;
3774 // For simple multidimensional array indexing, set the 'accessed' flag for
3775 // better bounds-checking of the base expression.
3776 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3777 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3778 else
3779 ArrayLV = EmitLValue(Array);
3780
3781 // Propagate the alignment from the array itself to the result.
3782 EltPtr = emitArraySubscriptGEP(
3783 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3784 ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
3785 /*signedIndices=*/false, E->getExprLoc());
3786 BaseInfo = ArrayLV.getBaseInfo();
3787 TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
3788 } else {
3789 Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
3790 TBAAInfo, BaseTy, ResultExprTy,
3791 IsLowerBound);
3792 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
3793 !getLangOpts().isSignedOverflowDefined(),
3794 /*signedIndices=*/false, E->getExprLoc());
3795 }
3796
3797 return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
3798}
3799
3800LValue CodeGenFunction::
3801EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
3802 // Emit the base vector as an l-value.
3803 LValue Base;
3804
3805 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
3806 if (E->isArrow()) {
17
Assuming the condition is true
18
Taking true branch
3807 // If it is a pointer to a vector, emit the address and form an lvalue with
3808 // it.
3809 LValueBaseInfo BaseInfo;
3810 TBAAAccessInfo TBAAInfo;
3811 Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
3812 const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
19
Assuming the object is not a 'PointerType'
20
'PT' initialized to a null pointer value
3813 Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
21
Called C++ object pointer is null
3814 Base.getQuals().removeObjCGCAttr();
3815 } else if (E->getBase()->isGLValue()) {
3816 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
3817 // emit the base as an lvalue.
3818 assert(E->getBase()->getType()->isVectorType())((E->getBase()->getType()->isVectorType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3818, __PRETTY_FUNCTION__))
;
3819 Base = EmitLValue(E->getBase());
3820 } else {
3821 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
3822 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3823, __PRETTY_FUNCTION__))
3823 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3823, __PRETTY_FUNCTION__))
;
3824 llvm::Value *Vec = EmitScalarExpr(E->getBase());
3825
3826 // Store the vector to memory (because LValue wants an address).
3827 Address VecMem = CreateMemTemp(E->getBase()->getType());
3828 Builder.CreateStore(Vec, VecMem);
3829 Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
3830 AlignmentSource::Decl);
3831 }
3832
3833 QualType type =
3834 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
3835
3836 // Encode the element access list into a vector of unsigned indices.
3837 SmallVector<uint32_t, 4> Indices;
3838 E->getEncodedElementAccess(Indices);
3839
3840 if (Base.isSimple()) {
3841 llvm::Constant *CV =
3842 llvm::ConstantDataVector::get(getLLVMContext(), Indices);
3843 return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
3844 Base.getBaseInfo(), TBAAAccessInfo());
3845 }
3846 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3846, __PRETTY_FUNCTION__))
;
3847
3848 llvm::Constant *BaseElts = Base.getExtVectorElts();
3849 SmallVector<llvm::Constant *, 4> CElts;
3850
3851 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
3852 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
3853 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
3854 return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
3855 Base.getBaseInfo(), TBAAAccessInfo());
3856}
3857
3858LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
3859 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
3860 EmitIgnoredExpr(E->getBase());
3861 return EmitDeclRefLValue(DRE);
3862 }
3863
3864 Expr *BaseExpr = E->getBase();
3865 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
3866 LValue BaseLV;
3867 if (E->isArrow()) {
3868 LValueBaseInfo BaseInfo;
3869 TBAAAccessInfo TBAAInfo;
3870 Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
3871 QualType PtrTy = BaseExpr->getType()->getPointeeType();
3872 SanitizerSet SkippedChecks;
3873 bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
3874 if (IsBaseCXXThis)
3875 SkippedChecks.set(SanitizerKind::Alignment, true);
3876 if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
3877 SkippedChecks.set(SanitizerKind::Null, true);
3878 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
3879 /*Alignment=*/CharUnits::Zero(), SkippedChecks);
3880 BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
3881 } else
3882 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
3883
3884 NamedDecl *ND = E->getMemberDecl();
3885 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
3886 LValue LV = EmitLValueForField(BaseLV, Field);
3887 setObjCGCLValueClass(getContext(), E, LV);
3888 return LV;
3889 }
3890
3891 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
3892 return EmitFunctionDeclLValue(*this, E, FD);
3893
3894 llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3894)
;
3895}
3896
3897/// Given that we are currently emitting a lambda, emit an l-value for
3898/// one of its members.
3899LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
3900 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3900, __PRETTY_FUNCTION__))
;
3901 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 3901, __PRETTY_FUNCTION__))
;
3902 QualType LambdaTagType =
3903 getContext().getTagDeclType(Field->getParent());
3904 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
3905 return EmitLValueForField(LambdaLV, Field);
3906}
3907
3908/// Get the field index in the debug info. The debug info structure/union
3909/// will ignore the unnamed bitfields.
3910unsigned CodeGenFunction::getDebugInfoFIndex(const RecordDecl *Rec,
3911 unsigned FieldIndex) {
3912 unsigned I = 0, Skipped = 0;
3913
3914 for (auto F : Rec->getDefinition()->fields()) {
3915 if (I == FieldIndex)
3916 break;
3917 if (F->isUnnamedBitfield())
3918 Skipped++;
3919 I++;
3920 }
3921
3922 return FieldIndex - Skipped;
3923}
3924
3925/// Get the address of a zero-sized field within a record. The resulting
3926/// address doesn't necessarily have the right type.
3927static Address emitAddrOfZeroSizeField(CodeGenFunction &CGF, Address Base,
3928 const FieldDecl *Field) {
3929 CharUnits Offset = CGF.getContext().toCharUnitsFromBits(
3930 CGF.getContext().getFieldOffset(Field));
3931 if (Offset.isZero())
3932 return Base;
3933 Base = CGF.Builder.CreateElementBitCast(Base, CGF.Int8Ty);
3934 return CGF.Builder.CreateConstInBoundsByteGEP(Base, Offset);
3935}
3936
3937/// Drill down to the storage of a field without walking into
3938/// reference types.
3939///
3940/// The resulting address doesn't necessarily have the right type.
3941static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
3942 const FieldDecl *field) {
3943 if (field->isZeroSize(CGF.getContext()))
3944 return emitAddrOfZeroSizeField(CGF, base, field);
3945
3946 const RecordDecl *rec = field->getParent();
3947
3948 unsigned idx =
3949 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
3950
3951 return CGF.Builder.CreateStructGEP(base, idx, field->getName());
3952}
3953
3954static Address emitPreserveStructAccess(CodeGenFunction &CGF, Address base,
3955 const FieldDecl *field) {
3956 const RecordDecl *rec = field->getParent();
3957 llvm::DIType *DbgInfo = CGF.getDebugInfo()->getOrCreateRecordType(
3958 CGF.getContext().getRecordType(rec), rec->getLocation());
3959
3960 unsigned idx =
3961 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
3962
3963 return CGF.Builder.CreatePreserveStructAccessIndex(
3964 base, idx, CGF.getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo);
3965}
3966
3967static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
3968 const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
3969 if (!RD)
3970 return false;
3971
3972 if (RD->isDynamicClass())
3973 return true;
3974
3975 for (const auto &Base : RD->bases())
3976 if (hasAnyVptr(Base.getType(), Context))
3977 return true;
3978
3979 for (const FieldDecl *Field : RD->fields())
3980 if (hasAnyVptr(Field->getType(), Context))
3981 return true;
3982
3983 return false;
3984}
3985
3986LValue CodeGenFunction::EmitLValueForField(LValue base,
3987 const FieldDecl *field) {
3988 LValueBaseInfo BaseInfo = base.getBaseInfo();
3989
3990 if (field->isBitField()) {
3991 const CGRecordLayout &RL =
3992 CGM.getTypes().getCGRecordLayout(field->getParent());
3993 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
3994 Address Addr = base.getAddress();
3995 unsigned Idx = RL.getLLVMFieldNo(field);
3996 if (!IsInPreservedAIRegion) {
3997 if (Idx != 0)
3998 // For structs, we GEP to the field that the record layout suggests.
3999 Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
4000 } else {
4001 const RecordDecl *rec = field->getParent();
4002 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4003 getContext().getRecordType(rec), rec->getLocation());
4004 Addr = Builder.CreatePreserveStructAccessIndex(Addr, Idx,
4005 getDebugInfoFIndex(rec, field->getFieldIndex()),
4006 DbgInfo);
4007 }
4008
4009 // Get the access type.
4010 llvm::Type *FieldIntTy =
4011 llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
4012 if (Addr.getElementType() != FieldIntTy)
4013 Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
4014
4015 QualType fieldType =
4016 field->getType().withCVRQualifiers(base.getVRQualifiers());
4017 // TODO: Support TBAA for bit fields.
4018 LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
4019 return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
4020 TBAAAccessInfo());
4021 }
4022
4023 // Fields of may-alias structures are may-alias themselves.
4024 // FIXME: this should get propagated down through anonymous structs
4025 // and unions.
4026 QualType FieldType = field->getType();
4027 const RecordDecl *rec = field->getParent();
4028 AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
4029 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
4030 TBAAAccessInfo FieldTBAAInfo;
4031 if (base.getTBAAInfo().isMayAlias() ||
4032 rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
4033 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4034 } else if (rec->isUnion()) {
4035 // TODO: Support TBAA for unions.
4036 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4037 } else {
4038 // If no base type been assigned for the base access, then try to generate
4039 // one for this base lvalue.
4040 FieldTBAAInfo = base.getTBAAInfo();
4041 if (!FieldTBAAInfo.BaseType) {
4042 FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
4043 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4044, __PRETTY_FUNCTION__))
4044 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4044, __PRETTY_FUNCTION__))
;
4045 }
4046
4047 // Adjust offset to be relative to the base type.
4048 const ASTRecordLayout &Layout =
4049 getContext().getASTRecordLayout(field->getParent());
4050 unsigned CharWidth = getContext().getCharWidth();
4051 if (FieldTBAAInfo.BaseType)
4052 FieldTBAAInfo.Offset +=
4053 Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
4054
4055 // Update the final access type and size.
4056 FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
4057 FieldTBAAInfo.Size =
4058 getContext().getTypeSizeInChars(FieldType).getQuantity();
4059 }
4060
4061 Address addr = base.getAddress();
4062 if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
4063 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4064 ClassDef->isDynamicClass()) {
4065 // Getting to any field of dynamic object requires stripping dynamic
4066 // information provided by invariant.group. This is because accessing
4067 // fields may leak the real address of dynamic object, which could result
4068 // in miscompilation when leaked pointer would be compared.
4069 auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
4070 addr = Address(stripped, addr.getAlignment());
4071 }
4072 }
4073
4074 unsigned RecordCVR = base.getVRQualifiers();
4075 if (rec->isUnion()) {
4076 // For unions, there is no pointer adjustment.
4077 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4078 hasAnyVptr(FieldType, getContext()))
4079 // Because unions can easily skip invariant.barriers, we need to add
4080 // a barrier every time CXXRecord field with vptr is referenced.
4081 addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
4082 addr.getAlignment());
4083
4084 if (IsInPreservedAIRegion) {
4085 // Remember the original union field index
4086 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4087 getContext().getRecordType(rec), rec->getLocation());
4088 addr = Address(
4089 Builder.CreatePreserveUnionAccessIndex(
4090 addr.getPointer(), getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo),
4091 addr.getAlignment());
4092 }
4093
4094 if (FieldType->isReferenceType())
4095 addr = Builder.CreateElementBitCast(
4096 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4097 } else {
4098 if (!IsInPreservedAIRegion)
4099 // For structs, we GEP to the field that the record layout suggests.
4100 addr = emitAddrOfFieldStorage(*this, addr, field);
4101 else
4102 // Remember the original struct field index
4103 addr = emitPreserveStructAccess(*this, addr, field);
4104 }
4105
4106 // If this is a reference field, load the reference right now.
4107 if (FieldType->isReferenceType()) {
4108 LValue RefLVal =
4109 MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4110 if (RecordCVR & Qualifiers::Volatile)
4111 RefLVal.getQuals().addVolatile();
4112 addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
4113
4114 // Qualifiers on the struct don't apply to the referencee.
4115 RecordCVR = 0;
4116 FieldType = FieldType->getPointeeType();
4117 }
4118
4119 // Make sure that the address is pointing to the right type. This is critical
4120 // for both unions and structs. A union needs a bitcast, a struct element
4121 // will need a bitcast if the LLVM type laid out doesn't match the desired
4122 // type.
4123 addr = Builder.CreateElementBitCast(
4124 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4125
4126 if (field->hasAttr<AnnotateAttr>())
4127 addr = EmitFieldAnnotations(field, addr);
4128
4129 LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4130 LV.getQuals().addCVRQualifiers(RecordCVR);
4131
4132 // __weak attribute on a field is ignored.
4133 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
4134 LV.getQuals().removeObjCGCAttr();
4135
4136 return LV;
4137}
4138
4139LValue
4140CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
4141 const FieldDecl *Field) {
4142 QualType FieldType = Field->getType();
4143
4144 if (!FieldType->isReferenceType())
4145 return EmitLValueForField(Base, Field);
4146
4147 Address V = emitAddrOfFieldStorage(*this, Base.getAddress(), Field);
4148
4149 // Make sure that the address is pointing to the right type.
4150 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
4151 V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
4152
4153 // TODO: Generate TBAA information that describes this access as a structure
4154 // member access and not just an access to an object of the field's type. This
4155 // should be similar to what we do in EmitLValueForField().
4156 LValueBaseInfo BaseInfo = Base.getBaseInfo();
4157 AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
4158 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
4159 return MakeAddrLValue(V, FieldType, FieldBaseInfo,
4160 CGM.getTBAAInfoForSubobject(Base, FieldType));
4161}
4162
4163LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
4164 if (E->isFileScope()) {
4165 ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
4166 return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
4167 }
4168 if (E->getType()->isVariablyModifiedType())
4169 // make sure to emit the VLA size.
4170 EmitVariablyModifiedType(E->getType());
4171
4172 Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
4173 const Expr *InitExpr = E->getInitializer();
4174 LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
4175
4176 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
4177 /*Init*/ true);
4178
4179 return Result;
4180}
4181
4182LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
4183 if (!E->isGLValue())
4184 // Initializing an aggregate temporary in C++11: T{...}.
4185 return EmitAggExprToLValue(E);
4186
4187 // An lvalue initializer list must be initializing a reference.
4188 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4188, __PRETTY_FUNCTION__))
;
4189 return EmitLValue(E->getInit(0));
4190}
4191
4192/// Emit the operand of a glvalue conditional operator. This is either a glvalue
4193/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
4194/// LValue is returned and the current block has been terminated.
4195static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
4196 const Expr *Operand) {
4197 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
4198 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
4199 return None;
4200 }
4201
4202 return CGF.EmitLValue(Operand);
4203}
4204
4205LValue CodeGenFunction::
4206EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
4207 if (!expr->isGLValue()) {
4208 // ?: here should be an aggregate.
4209 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4210, __PRETTY_FUNCTION__))
4210 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4210, __PRETTY_FUNCTION__))
;
4211 return EmitAggExprToLValue(expr);
4212 }
4213
4214 OpaqueValueMapping binding(*this, expr);
4215
4216 const Expr *condExpr = expr->getCond();
4217 bool CondExprBool;
4218 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
4219 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
4220 if (!CondExprBool) std::swap(live, dead);
4221
4222 if (!ContainsLabel(dead)) {
4223 // If the true case is live, we need to track its region.
4224 if (CondExprBool)
4225 incrementProfileCounter(expr);
4226 return EmitLValue(live);
4227 }
4228 }
4229
4230 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
4231 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
4232 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
4233
4234 ConditionalEvaluation eval(*this);
4235 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
4236
4237 // Any temporaries created here are conditional.
4238 EmitBlock(lhsBlock);
4239 incrementProfileCounter(expr);
4240 eval.begin(*this);
4241 Optional<LValue> lhs =
4242 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
4243 eval.end(*this);
4244
4245 if (lhs && !lhs->isSimple())
4246 return EmitUnsupportedLValue(expr, "conditional operator");
4247
4248 lhsBlock = Builder.GetInsertBlock();
4249 if (lhs)
4250 Builder.CreateBr(contBlock);
4251
4252 // Any temporaries created here are conditional.
4253 EmitBlock(rhsBlock);
4254 eval.begin(*this);
4255 Optional<LValue> rhs =
4256 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
4257 eval.end(*this);
4258 if (rhs && !rhs->isSimple())
4259 return EmitUnsupportedLValue(expr, "conditional operator");
4260 rhsBlock = Builder.GetInsertBlock();
4261
4262 EmitBlock(contBlock);
4263
4264 if (lhs && rhs) {
4265 llvm::PHINode *phi = Builder.CreatePHI(lhs->getPointer()->getType(),
4266 2, "cond-lvalue");
4267 phi->addIncoming(lhs->getPointer(), lhsBlock);
4268 phi->addIncoming(rhs->getPointer(), rhsBlock);
4269 Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
4270 AlignmentSource alignSource =
4271 std::max(lhs->getBaseInfo().getAlignmentSource(),
4272 rhs->getBaseInfo().getAlignmentSource());
4273 TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
4274 lhs->getTBAAInfo(), rhs->getTBAAInfo());
4275 return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
4276 TBAAInfo);
4277 } else {
4278 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4279, __PRETTY_FUNCTION__))
4279 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4279, __PRETTY_FUNCTION__))
;
4280 return lhs ? *lhs : *rhs;
4281 }
4282}
4283
4284/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4285/// type. If the cast is to a reference, we can have the usual lvalue result,
4286/// otherwise if a cast is needed by the code generator in an lvalue context,
4287/// then it must mean that we need the address of an aggregate in order to
4288/// access one of its members. This can happen for all the reasons that casts
4289/// are permitted with aggregate result, including noop aggregate casts, and
4290/// cast from scalar to union.
4291LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
4292 switch (E->getCastKind()) {
4293 case CK_ToVoid:
4294 case CK_BitCast:
4295 case CK_LValueToRValueBitCast:
4296 case CK_ArrayToPointerDecay:
4297 case CK_FunctionToPointerDecay:
4298 case CK_NullToMemberPointer:
4299 case CK_NullToPointer:
4300 case CK_IntegralToPointer:
4301 case CK_PointerToIntegral:
4302 case CK_PointerToBoolean:
4303 case CK_VectorSplat:
4304 case CK_IntegralCast:
4305 case CK_BooleanToSignedIntegral:
4306 case CK_IntegralToBoolean:
4307 case CK_IntegralToFloating:
4308 case CK_FloatingToIntegral:
4309 case CK_FloatingToBoolean:
4310 case CK_FloatingCast:
4311 case CK_FloatingRealToComplex:
4312 case CK_FloatingComplexToReal:
4313 case CK_FloatingComplexToBoolean:
4314 case CK_FloatingComplexCast:
4315 case CK_FloatingComplexToIntegralComplex:
4316 case CK_IntegralRealToComplex:
4317 case CK_IntegralComplexToReal:
4318 case CK_IntegralComplexToBoolean:
4319 case CK_IntegralComplexCast:
4320 case CK_IntegralComplexToFloatingComplex:
4321 case CK_DerivedToBaseMemberPointer:
4322 case CK_BaseToDerivedMemberPointer:
4323 case CK_MemberPointerToBoolean:
4324 case CK_ReinterpretMemberPointer:
4325 case CK_AnyPointerToBlockPointerCast:
4326 case CK_ARCProduceObject:
4327 case CK_ARCConsumeObject:
4328 case CK_ARCReclaimReturnedObject:
4329 case CK_ARCExtendBlockObject:
4330 case CK_CopyAndAutoreleaseBlockObject:
4331 case CK_IntToOCLSampler:
4332 case CK_FixedPointCast:
4333 case CK_FixedPointToBoolean:
4334 case CK_FixedPointToIntegral:
4335 case CK_IntegralToFixedPoint:
4336 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
4337
4338 case CK_Dependent:
4339 llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4339)
;
4340
4341 case CK_BuiltinFnToFnPtr:
4342 llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4342)
;
4343
4344 // These are never l-values; just use the aggregate emission code.
4345 case CK_NonAtomicToAtomic:
4346 case CK_AtomicToNonAtomic:
4347 return EmitAggExprToLValue(E);
4348
4349 case CK_Dynamic: {
4350 LValue LV = EmitLValue(E->getSubExpr());
4351 Address V = LV.getAddress();
4352 const auto *DCE = cast<CXXDynamicCastExpr>(E);
4353 return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
4354 }
4355
4356 case CK_ConstructorConversion:
4357 case CK_UserDefinedConversion:
4358 case CK_CPointerToObjCPointerCast:
4359 case CK_BlockPointerToObjCPointerCast:
4360 case CK_NoOp:
4361 case CK_LValueToRValue:
4362 return EmitLValue(E->getSubExpr());
4363
4364 case CK_UncheckedDerivedToBase:
4365 case CK_DerivedToBase: {
4366 const RecordType *DerivedClassTy =
4367 E->getSubExpr()->getType()->getAs<RecordType>();
4368 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4369
4370 LValue LV = EmitLValue(E->getSubExpr());
4371 Address This = LV.getAddress();
4372
4373 // Perform the derived-to-base conversion
4374 Address Base = GetAddressOfBaseClass(
4375 This, DerivedClassDecl, E->path_begin(), E->path_end(),
4376 /*NullCheckValue=*/false, E->getExprLoc());
4377
4378 // TODO: Support accesses to members of base classes in TBAA. For now, we
4379 // conservatively pretend that the complete object is of the base class
4380 // type.
4381 return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
4382 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4383 }
4384 case CK_ToUnion:
4385 return EmitAggExprToLValue(E);
4386 case CK_BaseToDerived: {
4387 const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
4388 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4389
4390 LValue LV = EmitLValue(E->getSubExpr());
4391
4392 // Perform the base-to-derived conversion
4393 Address Derived =
4394 GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
4395 E->path_begin(), E->path_end(),
4396 /*NullCheckValue=*/false);
4397
4398 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
4399 // performed and the object is not of the derived type.
4400 if (sanitizePerformTypeCheck())
4401 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
4402 Derived.getPointer(), E->getType());
4403
4404 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
4405 EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
4406 /*MayBeNull=*/false, CFITCK_DerivedCast,
4407 E->getBeginLoc());
4408
4409 return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
4410 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4411 }
4412 case CK_LValueBitCast: {
4413 // This must be a reinterpret_cast (or c-style equivalent).
4414 const auto *CE = cast<ExplicitCastExpr>(E);
4415
4416 CGM.EmitExplicitCastExprType(CE, this);
4417 LValue LV = EmitLValue(E->getSubExpr());
4418 Address V = Builder.CreateBitCast(LV.getAddress(),
4419 ConvertType(CE->getTypeAsWritten()));
4420
4421 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
4422 EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
4423 /*MayBeNull=*/false, CFITCK_UnrelatedCast,
4424 E->getBeginLoc());
4425
4426 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4427 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4428 }
4429 case CK_AddressSpaceConversion: {
4430 LValue LV = EmitLValue(E->getSubExpr());
4431 QualType DestTy = getContext().getPointerType(E->getType());
4432 llvm::Value *V = getTargetHooks().performAddrSpaceCast(
4433 *this, LV.getPointer(), E->getSubExpr()->getType().getAddressSpace(),
4434 E->getType().getAddressSpace(), ConvertType(DestTy));
4435 return MakeAddrLValue(Address(V, LV.getAddress().getAlignment()),
4436 E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
4437 }
4438 case CK_ObjCObjectLValueCast: {
4439 LValue LV = EmitLValue(E->getSubExpr());
4440 Address V = Builder.CreateElementBitCast(LV.getAddress(),
4441 ConvertType(E->getType()));
4442 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4443 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4444 }
4445 case CK_ZeroToOCLOpaqueType:
4446 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4446)
;
4447 }
4448
4449 llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4449)
;
4450}
4451
4452LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
4453 assert(OpaqueValueMappingData::shouldBindAsLValue(e))((OpaqueValueMappingData::shouldBindAsLValue(e)) ? static_cast
<void> (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4453, __PRETTY_FUNCTION__))
;
4454 return getOrCreateOpaqueLValueMapping(e);
4455}
4456
4457LValue
4458CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
4459 assert(OpaqueValueMapping::shouldBindAsLValue(e))((OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4459, __PRETTY_FUNCTION__))
;
4460
4461 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
4462 it = OpaqueLValues.find(e);
4463
4464 if (it != OpaqueLValues.end())
4465 return it->second;
4466
4467 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4467, __PRETTY_FUNCTION__))
;
4468 return EmitLValue(e->getSourceExpr());
4469}
4470
4471RValue
4472CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
4473 assert(!OpaqueValueMapping::shouldBindAsLValue(e))((!OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4473, __PRETTY_FUNCTION__))
;
4474
4475 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
4476 it = OpaqueRValues.find(e);
4477
4478 if (it != OpaqueRValues.end())
4479 return it->second;
4480
4481 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4481, __PRETTY_FUNCTION__))
;
4482 return EmitAnyExpr(e->getSourceExpr());
4483}
4484
4485RValue CodeGenFunction::EmitRValueForField(LValue LV,
4486 const FieldDecl *FD,
4487 SourceLocation Loc) {
4488 QualType FT = FD->getType();
4489 LValue FieldLV = EmitLValueForField(LV, FD);
4490 switch (getEvaluationKind(FT)) {
4491 case TEK_Complex:
4492 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
4493 case TEK_Aggregate:
4494 return FieldLV.asAggregateRValue();
4495 case TEK_Scalar:
4496 // This routine is used to load fields one-by-one to perform a copy, so
4497 // don't load reference fields.
4498 if (FD->getType()->isReferenceType())
4499 return RValue::get(FieldLV.getPointer());
4500 return EmitLoadOfLValue(FieldLV, Loc);
4501 }
4502 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4502)
;
4503}
4504
4505//===--------------------------------------------------------------------===//
4506// Expression Emission
4507//===--------------------------------------------------------------------===//
4508
4509RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
4510 ReturnValueSlot ReturnValue) {
4511 // Builtins never have block type.
4512 if (E->getCallee()->getType()->isBlockPointerType())
4513 return EmitBlockCallExpr(E, ReturnValue);
4514
4515 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
4516 return EmitCXXMemberCallExpr(CE, ReturnValue);
4517
4518 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
4519 return EmitCUDAKernelCallExpr(CE, ReturnValue);
4520
4521 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
4522 if (const CXXMethodDecl *MD =
4523 dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
4524 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
4525
4526 CGCallee callee = EmitCallee(E->getCallee());
4527
4528 if (callee.isBuiltin()) {
4529 return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
4530 E, ReturnValue);
4531 }
4532
4533 if (callee.isPseudoDestructor()) {
4534 return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
4535 }
4536
4537 return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
4538}
4539
4540/// Emit a CallExpr without considering whether it might be a subclass.
4541RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
4542 ReturnValueSlot ReturnValue) {
4543 CGCallee Callee = EmitCallee(E->getCallee());
4544 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4545}
4546
4547static CGCallee EmitDirectCallee(CodeGenFunction &CGF, const FunctionDecl *FD) {
4548 if (auto builtinID = FD->getBuiltinID()) {
4549 return CGCallee::forBuiltin(builtinID, FD);
4550 }
4551
4552 llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, FD);
4553 return CGCallee::forDirect(calleePtr, GlobalDecl(FD));
4554}
4555
4556CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
4557 E = E->IgnoreParens();
4558
4559 // Look through function-to-pointer decay.
4560 if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
4561 if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
4562 ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
4563 return EmitCallee(ICE->getSubExpr());
4564 }
4565
4566 // Resolve direct calls.
4567 } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
4568 if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
4569 return EmitDirectCallee(*this, FD);
4570 }
4571 } else if (auto ME = dyn_cast<MemberExpr>(E)) {
4572 if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
4573 EmitIgnoredExpr(ME->getBase());
4574 return EmitDirectCallee(*this, FD);
4575 }
4576
4577 // Look through template substitutions.
4578 } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
4579 return EmitCallee(NTTP->getReplacement());
4580
4581 // Treat pseudo-destructor calls differently.
4582 } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
4583 return CGCallee::forPseudoDestructor(PDE);
4584 }
4585
4586 // Otherwise, we have an indirect reference.
4587 llvm::Value *calleePtr;
4588 QualType functionType;
4589 if (auto ptrType = E->getType()->getAs<PointerType>()) {
4590 calleePtr = EmitScalarExpr(E);
4591 functionType = ptrType->getPointeeType();
4592 } else {
4593 functionType = E->getType();
4594 calleePtr = EmitLValue(E).getPointer();
4595 }
4596 assert(functionType->isFunctionType())((functionType->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("functionType->isFunctionType()", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4596, __PRETTY_FUNCTION__))
;
4597
4598 GlobalDecl GD;
4599 if (const auto *VD =
4600 dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
4601 GD = GlobalDecl(VD);
4602
4603 CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
4604 CGCallee callee(calleeInfo, calleePtr);
4605 return callee;
4606}
4607
4608LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
4609 // Comma expressions just emit their LHS then their RHS as an l-value.
4610 if (E->getOpcode() == BO_Comma) {
4611 EmitIgnoredExpr(E->getLHS());
4612 EnsureInsertPoint();
4613 return EmitLValue(E->getRHS());
4614 }
4615
4616 if (E->getOpcode() == BO_PtrMemD ||
4617 E->getOpcode() == BO_PtrMemI)
4618 return EmitPointerToDataMemberBinaryExpr(E);
4619
4620 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4620, __PRETTY_FUNCTION__))
;
4621
4622 // Note that in all of these cases, __block variables need the RHS
4623 // evaluated first just in case the variable gets moved by the RHS.
4624
4625 switch (getEvaluationKind(E->getType())) {
4626 case TEK_Scalar: {
4627 switch (E->getLHS()->getType().getObjCLifetime()) {
4628 case Qualifiers::OCL_Strong:
4629 return EmitARCStoreStrong(E, /*ignored*/ false).first;
4630
4631 case Qualifiers::OCL_Autoreleasing:
4632 return EmitARCStoreAutoreleasing(E).first;
4633
4634 // No reason to do any of these differently.
4635 case Qualifiers::OCL_None:
4636 case Qualifiers::OCL_ExplicitNone:
4637 case Qualifiers::OCL_Weak:
4638 break;
4639 }
4640
4641 RValue RV = EmitAnyExpr(E->getRHS());
4642 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
4643 if (RV.isScalar())
4644 EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
4645 EmitStoreThroughLValue(RV, LV);
4646 return LV;
4647 }
4648
4649 case TEK_Complex:
4650 return EmitComplexAssignmentLValue(E);
4651
4652 case TEK_Aggregate:
4653 return EmitAggExprToLValue(E);
4654 }
4655 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4655)
;
4656}
4657
4658LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
4659 RValue RV = EmitCallExpr(E);
4660
4661 if (!RV.isScalar())
4662 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4663 AlignmentSource::Decl);
4664
4665 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__))
4666 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__))
4667 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4667, __PRETTY_FUNCTION__))
;
4668
4669 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4670}
4671
4672LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
4673 // FIXME: This shouldn't require another copy.
4674 return EmitAggExprToLValue(E);
4675}
4676
4677LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
4678 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4679, __PRETTY_FUNCTION__))
4679 && "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4679, __PRETTY_FUNCTION__))
;
4680 AggValueSlot Slot = CreateAggTemp(E->getType());
4681 EmitCXXConstructExpr(E, Slot);
4682 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4683}
4684
4685LValue
4686CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
4687 return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4688}
4689
4690Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
4691 return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
4692 ConvertType(E->getType()));
4693}
4694
4695LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
4696 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
4697 AlignmentSource::Decl);
4698}
4699
4700LValue
4701CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
4702 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4703 Slot.setExternallyDestructed();
4704 EmitAggExpr(E->getSubExpr(), Slot);
4705 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
4706 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4707}
4708
4709LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
4710 RValue RV = EmitObjCMessageExpr(E);
4711
4712 if (!RV.isScalar())
4713 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4714 AlignmentSource::Decl);
4715
4716 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__))
4717 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__))
4718 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4718, __PRETTY_FUNCTION__))
;
4719
4720 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4721}
4722
4723LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
4724 Address V =
4725 CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
4726 return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
4727}
4728
4729llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
4730 const ObjCIvarDecl *Ivar) {
4731 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
4732}
4733
4734LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
4735 llvm::Value *BaseValue,
4736 const ObjCIvarDecl *Ivar,
4737 unsigned CVRQualifiers) {
4738 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
4739 Ivar, CVRQualifiers);
4740}
4741
4742LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
4743 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
4744 llvm::Value *BaseValue = nullptr;
4745 const Expr *BaseExpr = E->getBase();
4746 Qualifiers BaseQuals;
4747 QualType ObjectTy;
4748 if (E->isArrow()) {
4749 BaseValue = EmitScalarExpr(BaseExpr);
4750 ObjectTy = BaseExpr->getType()->getPointeeType();
4751 BaseQuals = ObjectTy.getQualifiers();
4752 } else {
4753 LValue BaseLV = EmitLValue(BaseExpr);
4754 BaseValue = BaseLV.getPointer();
4755 ObjectTy = BaseExpr->getType();
4756 BaseQuals = ObjectTy.getQualifiers();
4757 }
4758
4759 LValue LV =
4760 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
4761 BaseQuals.getCVRQualifiers());
4762 setObjCGCLValueClass(getContext(), E, LV);
4763 return LV;
4764}
4765
4766LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
4767 // Can only get l-value for message expression returning aggregate type
4768 RValue RV = EmitAnyExprToTemp(E);
4769 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4770 AlignmentSource::Decl);
4771}
4772
4773RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
4774 const CallExpr *E, ReturnValueSlot ReturnValue,
4775 llvm::Value *Chain) {
4776 // Get the actual function type. The callee type will always be a pointer to
4777 // function type or a block pointer type.
4778 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4779, __PRETTY_FUNCTION__))
4779 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4779, __PRETTY_FUNCTION__))
;
4780
4781 const Decl *TargetDecl =
4782 OrigCallee.getAbstractInfo().getCalleeDecl().getDecl();
4783
4784 CalleeType = getContext().getCanonicalType(CalleeType);
4785
4786 auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
4787
4788 CGCallee Callee = OrigCallee;
4789
4790 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
4791 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4792 if (llvm::Constant *PrefixSig =
4793 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
4794 SanitizerScope SanScope(this);
4795 // Remove any (C++17) exception specifications, to allow calling e.g. a
4796 // noexcept function through a non-noexcept pointer.
4797 auto ProtoTy =
4798 getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
4799 llvm::Constant *FTRTTIConst =
4800 CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
4801 llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
4802 llvm::StructType *PrefixStructTy = llvm::StructType::get(
4803 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
4804
4805 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4806
4807 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
4808 CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
4809 llvm::Value *CalleeSigPtr =
4810 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
4811 llvm::Value *CalleeSig =
4812 Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
4813 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
4814
4815 llvm::BasicBlock *Cont = createBasicBlock("cont");
4816 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
4817 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
4818
4819 EmitBlock(TypeCheck);
4820 llvm::Value *CalleeRTTIPtr =
4821 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
4822 llvm::Value *CalleeRTTIEncoded =
4823 Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
4824 llvm::Value *CalleeRTTI =
4825 DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
4826 llvm::Value *CalleeRTTIMatch =
4827 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
4828 llvm::Constant *StaticData[] = {EmitCheckSourceLocation(E->getBeginLoc()),
4829 EmitCheckTypeDescriptor(CalleeType)};
4830 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
4831 SanitizerHandler::FunctionTypeMismatch, StaticData,
4832 {CalleePtr, CalleeRTTI, FTRTTIConst});
4833
4834 Builder.CreateBr(Cont);
4835 EmitBlock(Cont);
4836 }
4837 }
4838
4839 const auto *FnType = cast<FunctionType>(PointeeType);
4840
4841 // If we are checking indirect calls and this call is indirect, check that the
4842 // function pointer is a member of the bit set for the function type.
4843 if (SanOpts.has(SanitizerKind::CFIICall) &&
4844 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4845 SanitizerScope SanScope(this);
4846 EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
4847
4848 llvm::Metadata *MD;
4849 if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
4850 MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
4851 else
4852 MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
4853
4854 llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
4855
4856 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4857 llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
4858 llvm::Value *TypeTest = Builder.CreateCall(
4859 CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
4860
4861 auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
4862 llvm::Constant *StaticData[] = {
4863 llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
4864 EmitCheckSourceLocation(E->getBeginLoc()),
4865 EmitCheckTypeDescriptor(QualType(FnType, 0)),
4866 };
4867 if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
4868 EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
4869 CastedCallee, StaticData);
4870 } else {
4871 EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
4872 SanitizerHandler::CFICheckFail, StaticData,
4873 {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
4874 }
4875 }
4876
4877 CallArgList Args;
4878 if (Chain)
4879 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
4880 CGM.getContext().VoidPtrTy);
4881
4882 // C++17 requires that we evaluate arguments to a call using assignment syntax
4883 // right-to-left, and that we evaluate arguments to certain other operators
4884 // left-to-right. Note that we allow this to override the order dictated by
4885 // the calling convention on the MS ABI, which means that parameter
4886 // destruction order is not necessarily reverse construction order.
4887 // FIXME: Revisit this based on C++ committee response to unimplementability.
4888 EvaluationOrder Order = EvaluationOrder::Default;
4889 if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
4890 if (OCE->isAssignmentOp())
4891 Order = EvaluationOrder::ForceRightToLeft;
4892 else {
4893 switch (OCE->getOperator()) {
4894 case OO_LessLess:
4895 case OO_GreaterGreater:
4896 case OO_AmpAmp:
4897 case OO_PipePipe:
4898 case OO_Comma:
4899 case OO_ArrowStar:
4900 Order = EvaluationOrder::ForceLeftToRight;
4901 break;
4902 default:
4903 break;
4904 }
4905 }
4906 }
4907
4908 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
4909 E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
4910
4911 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
4912 Args, FnType, /*ChainCall=*/Chain);
4913
4914 // C99 6.5.2.2p6:
4915 // If the expression that denotes the called function has a type
4916 // that does not include a prototype, [the default argument
4917 // promotions are performed]. If the number of arguments does not
4918 // equal the number of parameters, the behavior is undefined. If
4919 // the function is defined with a type that includes a prototype,
4920 // and either the prototype ends with an ellipsis (, ...) or the
4921 // types of the arguments after promotion are not compatible with
4922 // the types of the parameters, the behavior is undefined. If the
4923 // function is defined with a type that does not include a
4924 // prototype, and the types of the arguments after promotion are
4925 // not compatible with those of the parameters after promotion,
4926 // the behavior is undefined [except in some trivial cases].
4927 // That is, in the general case, we should assume that a call
4928 // through an unprototyped function type works like a *non-variadic*
4929 // call. The way we make this work is to cast to the exact type
4930 // of the promoted arguments.
4931 //
4932 // Chain calls use this same code path to add the invisible chain parameter
4933 // to the function type.
4934 if (isa<FunctionNoProtoType>(FnType) || Chain) {
4935 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
4936 CalleeTy = CalleeTy->getPointerTo();
4937
4938 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4939 CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
4940 Callee.setFunctionPointer(CalleePtr);
4941 }
4942
4943 llvm::CallBase *CallOrInvoke = nullptr;
4944 RValue Call = EmitCall(FnInfo, Callee, ReturnValue, Args, &CallOrInvoke,
4945 E->getExprLoc());
4946
4947 // Generate function declaration DISuprogram in order to be used
4948 // in debug info about call sites.
4949 if (CGDebugInfo *DI = getDebugInfo()) {
4950 if (auto *CalleeDecl = dyn_cast_or_null<FunctionDecl>(TargetDecl))
4951 DI->EmitFuncDeclForCallSite(CallOrInvoke, QualType(FnType, 0),
4952 CalleeDecl);
4953 }
4954
4955 return Call;
4956}
4957
4958LValue CodeGenFunction::
4959EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
4960 Address BaseAddr = Address::invalid();
4961 if (E->getOpcode() == BO_PtrMemI) {
4962 BaseAddr = EmitPointerWithAlignment(E->getLHS());
4963 } else {
4964 BaseAddr = EmitLValue(E->getLHS()).getAddress();
4965 }
4966
4967 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
4968
4969 const MemberPointerType *MPT
4970 = E->getRHS()->getType()->getAs<MemberPointerType>();
4971
4972 LValueBaseInfo BaseInfo;
4973 TBAAAccessInfo TBAAInfo;
4974 Address MemberAddr =
4975 EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
4976 &TBAAInfo);
4977
4978 return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
4979}
4980
4981/// Given the address of a temporary variable, produce an r-value of
4982/// its type.
4983RValue CodeGenFunction::convertTempToRValue(Address addr,
4984 QualType type,
4985 SourceLocation loc) {
4986 LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
4987 switch (getEvaluationKind(type)) {
4988 case TEK_Complex:
4989 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
4990 case TEK_Aggregate:
4991 return lvalue.asAggregateRValue();
4992 case TEK_Scalar:
4993 return RValue::get(EmitLoadOfScalar(lvalue, loc));
4994 }
4995 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4995)
;
4996}
4997
4998void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
4999 assert(Val->getType()->isFPOrFPVectorTy())((Val->getType()->isFPOrFPVectorTy()) ? static_cast<
void> (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 4999, __PRETTY_FUNCTION__))
;
5000 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
5001 return;
5002
5003 llvm::MDBuilder MDHelper(getLLVMContext());
5004 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
5005
5006 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
5007}
5008
5009namespace {
5010 struct LValueOrRValue {
5011 LValue LV;
5012 RValue RV;
5013 };
5014}
5015
5016static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
5017 const PseudoObjectExpr *E,
5018 bool forLValue,
5019 AggValueSlot slot) {
5020 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
5021
5022 // Find the result expression, if any.
5023 const Expr *resultExpr = E->getResultExpr();
5024 LValueOrRValue result;
5025
5026 for (PseudoObjectExpr::const_semantics_iterator
3
Loop condition is true. Entering loop body
5027 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2
Assuming 'i' is not equal to 'e'
5028 const Expr *semantic = *i;
5029
5030 // If this semantic expression is an opaque value, bind it
5031 // to the result of its source expression.
5032 if (const auto *ov
4.1
'ov' is null
= dyn_cast<OpaqueValueExpr>(semantic)) {
4
Assuming 'semantic' is not a 'OpaqueValueExpr'
5
Taking false branch
5033 // Skip unique OVEs.
5034 if (ov->isUnique()) {
5035 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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 5036, __PRETTY_FUNCTION__))
5036 "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-10~+201911111502510600c19528f1809/clang/lib/CodeGen/CGExpr.cpp"
, 5036, __PRETTY_FUNCTION__))
;
5037 continue;
5038 }
5039
5040 // If this is the result expression, we may need to evaluate
5041 // directly into the slot.
5042 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
5043 OVMA opaqueData;
5044 if (ov == resultExpr && ov->isRValue() && !forLValue &&
5045 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
5046 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
5047 LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
5048 AlignmentSource::Decl);
5049 opaqueData = OVMA::bind(CGF, ov, LV);
5050 result.RV = slot.asRValue();
5051
5052 // Otherwise, emit as normal.
5053 } else {
5054 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
5055
5056 // If this is the result, also evaluate the result now.
5057 if (ov == resultExpr) {
5058 if (forLValue)
5059 result.LV = CGF.EmitLValue(ov);
5060 else
5061 result.RV = CGF.EmitAnyExpr(ov, slot);
5062 }
5063 }
5064
5065 opaques.push_back(opaqueData);
5066
5067 // Otherwise, if the expression is the result, evaluate it
5068 // and remember the result.
5069 } else if (semantic == resultExpr) {
6
Assuming 'semantic' is not equal to 'resultExpr'
7
Taking false branch
5070 if (forLValue)
5071 result.LV = CGF.EmitLValue(semantic);
5072 else
5073 result.RV = CGF.EmitAnyExpr(semantic, slot);
5074
5075 // Otherwise, evaluate the expression in an ignored context.
5076 } else {
5077 CGF.EmitIgnoredExpr(semantic);
8
Calling 'CodeGenFunction::EmitIgnoredExpr'
5078 }
5079 }
5080
5081 // Unbind all the opaques now.
5082 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
5083 opaques[i].unbind(CGF);
5084
5085 return result;
5086}
5087
5088RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
5089 AggValueSlot slot) {
5090 return emitPseudoObjectExpr(*this, E, false, slot).RV;
1
Calling 'emitPseudoObjectExpr'
5091}
5092
5093LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
5094 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
5095}