Bug Summary

File:tools/clang/lib/CodeGen/CGExpr.cpp
Warning:line 3325, column 20
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-eagerly-assume -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 -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn338205/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/lib/gcc/x86_64-linux-gnu/8/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-class-memaccess -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn338205/build-llvm/tools/clang/lib/CodeGen -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-07-29-043837-17923-1 -x c++ /build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp -faddrsig
1//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CGCXXABI.h"
15#include "CGCall.h"
16#include "CGCleanup.h"
17#include "CGDebugInfo.h"
18#include "CGObjCRuntime.h"
19#include "CGOpenMPRuntime.h"
20#include "CGRecordLayout.h"
21#include "CodeGenFunction.h"
22#include "CodeGenModule.h"
23#include "ConstantEmitter.h"
24#include "TargetInfo.h"
25#include "clang/AST/ASTContext.h"
26#include "clang/AST/Attr.h"
27#include "clang/AST/DeclObjC.h"
28#include "clang/AST/NSAPI.h"
29#include "clang/Frontend/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.getQuantity());
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()))(static_cast <bool> (isa<llvm::AllocaInst>(Var.getPointer
())) ? void (0) : __assert_fail ("isa<llvm::AllocaInst>(Var.getPointer())"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 127, __extension__ __PRETTY_FUNCTION__))
;
128 auto *Store = new llvm::StoreInst(Init, Var.getPointer());
129 Store->setAlignment(Var.getAlignment().getQuantity());
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())
184 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
185
186 // Just emit it as an l-value and drop the result.
187 EmitLValue(E);
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-7~svn338205/tools/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-7~svn338205/tools/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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 312)
;
313 }
314 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-7~svn338205/tools/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::Constant *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.getAddrOfCXXStructor(ReferenceTemporaryDtor,
344 StructorType::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-7~svn338205/tools/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.getQuantity());
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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 413)
;
414 }
415 llvm_unreachable("unknown storage duration")::llvm::llvm_unreachable_internal("unknown storage duration",
"/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 415)
;
416}
417
418LValue CodeGenFunction::
419EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
420 const Expr *E = M->GetTemporaryExpr();
421
422 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
423 // as that will cause the lifetime adjustment to be lost for ARC
424 auto ownership = M->getType().getObjCLifetime();
425 if (ownership != Qualifiers::OCL_None &&
426 ownership != Qualifiers::OCL_ExplicitNone) {
427 Address Object = createReferenceTemporary(*this, M, E);
428 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
429 Object = Address(llvm::ConstantExpr::getBitCast(Var,
430 ConvertTypeForMem(E->getType())
431 ->getPointerTo(Object.getAddressSpace())),
432 Object.getAlignment());
433
434 // createReferenceTemporary will promote the temporary to a global with a
435 // constant initializer if it can. It can only do this to a value of
436 // ARC-manageable type if the value is global and therefore "immune" to
437 // ref-counting operations. Therefore we have no need to emit either a
438 // dynamic initialization or a cleanup and we can just return the address
439 // of the temporary.
440 if (Var->hasInitializer())
441 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
442
443 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
444 }
445 LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
446 AlignmentSource::Decl);
447
448 switch (getEvaluationKind(E->getType())) {
449 default: llvm_unreachable("expected scalar or aggregate expression")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 449)
;
450 case TEK_Scalar:
451 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
452 break;
453 case TEK_Aggregate: {
454 EmitAggExpr(E, AggValueSlot::forAddr(Object,
455 E->getType().getQualifiers(),
456 AggValueSlot::IsDestructed,
457 AggValueSlot::DoesNotNeedGCBarriers,
458 AggValueSlot::IsNotAliased,
459 AggValueSlot::DoesNotOverlap));
460 break;
461 }
462 }
463
464 pushTemporaryCleanup(*this, M, E, Object);
465 return RefTempDst;
466 }
467
468 SmallVector<const Expr *, 2> CommaLHSs;
469 SmallVector<SubobjectAdjustment, 2> Adjustments;
470 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
471
472 for (const auto &Ignored : CommaLHSs)
473 EmitIgnoredExpr(Ignored);
474
475 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
476 if (opaque->getType()->isRecordType()) {
477 assert(Adjustments.empty())(static_cast <bool> (Adjustments.empty()) ? void (0) : __assert_fail
("Adjustments.empty()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 477, __extension__ __PRETTY_FUNCTION__))
;
478 return EmitOpaqueValueLValue(opaque);
479 }
480 }
481
482 // Create and initialize the reference temporary.
483 Address Alloca = Address::invalid();
484 Address Object = createReferenceTemporary(*this, M, E, &Alloca);
485 if (auto *Var = dyn_cast<llvm::GlobalVariable>(
486 Object.getPointer()->stripPointerCasts())) {
487 Object = Address(llvm::ConstantExpr::getBitCast(
488 cast<llvm::Constant>(Object.getPointer()),
489 ConvertTypeForMem(E->getType())->getPointerTo()),
490 Object.getAlignment());
491 // If the temporary is a global and has a constant initializer or is a
492 // constant temporary that we promoted to a global, we may have already
493 // initialized it.
494 if (!Var->hasInitializer()) {
495 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
496 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
497 }
498 } else {
499 switch (M->getStorageDuration()) {
500 case SD_Automatic:
501 case SD_FullExpression:
502 if (auto *Size = EmitLifetimeStart(
503 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
504 Alloca.getPointer())) {
505 if (M->getStorageDuration() == SD_Automatic)
506 pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
507 Alloca, Size);
508 else
509 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
510 Size);
511 }
512 break;
513 default:
514 break;
515 }
516 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
517 }
518 pushTemporaryCleanup(*this, M, E, Object);
519
520 // Perform derived-to-base casts and/or field accesses, to get from the
521 // temporary object we created (and, potentially, for which we extended
522 // the lifetime) to the subobject we're binding the reference to.
523 for (unsigned I = Adjustments.size(); I != 0; --I) {
524 SubobjectAdjustment &Adjustment = Adjustments[I-1];
525 switch (Adjustment.Kind) {
526 case SubobjectAdjustment::DerivedToBaseAdjustment:
527 Object =
528 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
529 Adjustment.DerivedToBase.BasePath->path_begin(),
530 Adjustment.DerivedToBase.BasePath->path_end(),
531 /*NullCheckValue=*/ false, E->getExprLoc());
532 break;
533
534 case SubobjectAdjustment::FieldAdjustment: {
535 LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
536 LV = EmitLValueForField(LV, Adjustment.Field);
537 assert(LV.isSimple() &&(static_cast <bool> (LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? void (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 538, __extension__ __PRETTY_FUNCTION__))
538 "materialized temporary field is not a simple lvalue")(static_cast <bool> (LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? void (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 538, __extension__ __PRETTY_FUNCTION__))
;
539 Object = LV.getAddress();
540 break;
541 }
542
543 case SubobjectAdjustment::MemberPointerAdjustment: {
544 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
545 Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
546 Adjustment.Ptr.MPT);
547 break;
548 }
549 }
550 }
551
552 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
553}
554
555RValue
556CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
557 // Emit the expression as an lvalue.
558 LValue LV = EmitLValue(E);
559 assert(LV.isSimple())(static_cast <bool> (LV.isSimple()) ? void (0) : __assert_fail
("LV.isSimple()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 559, __extension__ __PRETTY_FUNCTION__))
;
560 llvm::Value *Value = LV.getPointer();
561
562 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
563 // C++11 [dcl.ref]p5 (as amended by core issue 453):
564 // If a glvalue to which a reference is directly bound designates neither
565 // an existing object or function of an appropriate type nor a region of
566 // storage of suitable size and alignment to contain an object of the
567 // reference's type, the behavior is undefined.
568 QualType Ty = E->getType();
569 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
570 }
571
572 return RValue::get(Value);
573}
574
575
576/// getAccessedFieldNo - Given an encoded value and a result number, return the
577/// input field number being accessed.
578unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
579 const llvm::Constant *Elts) {
580 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
581 ->getZExtValue();
582}
583
584/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
585static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
586 llvm::Value *High) {
587 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
588 llvm::Value *K47 = Builder.getInt64(47);
589 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
590 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
591 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
592 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
593 return Builder.CreateMul(B1, KMul);
594}
595
596bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
597 return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
598 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
599}
600
601bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
602 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
603 return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
604 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
605 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
606 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
607}
608
609bool CodeGenFunction::sanitizePerformTypeCheck() const {
610 return SanOpts.has(SanitizerKind::Null) |
611 SanOpts.has(SanitizerKind::Alignment) |
612 SanOpts.has(SanitizerKind::ObjectSize) |
613 SanOpts.has(SanitizerKind::Vptr);
614}
615
616void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
617 llvm::Value *Ptr, QualType Ty,
618 CharUnits Alignment,
619 SanitizerSet SkippedChecks) {
620 if (!sanitizePerformTypeCheck())
621 return;
622
623 // Don't check pointers outside the default address space. The null check
624 // isn't correct, the object-size check isn't supported by LLVM, and we can't
625 // communicate the addresses to the runtime handler for the vptr check.
626 if (Ptr->getType()->getPointerAddressSpace())
627 return;
628
629 // Don't check pointers to volatile data. The behavior here is implementation-
630 // defined.
631 if (Ty.isVolatileQualified())
632 return;
633
634 SanitizerScope SanScope(this);
635
636 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
637 llvm::BasicBlock *Done = nullptr;
638
639 // Quickly determine whether we have a pointer to an alloca. It's possible
640 // to skip null checks, and some alignment checks, for these pointers. This
641 // can reduce compile-time significantly.
642 auto PtrToAlloca =
643 dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCastsNoFollowAliases());
644
645 llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
646 llvm::Value *IsNonNull = nullptr;
647 bool IsGuaranteedNonNull =
648 SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
649 bool AllowNullPointers = isNullPointerAllowed(TCK);
650 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
651 !IsGuaranteedNonNull) {
652 // The glvalue must not be an empty glvalue.
653 IsNonNull = Builder.CreateIsNotNull(Ptr);
654
655 // The IR builder can constant-fold the null check if the pointer points to
656 // a constant.
657 IsGuaranteedNonNull = IsNonNull == True;
658
659 // Skip the null check if the pointer is known to be non-null.
660 if (!IsGuaranteedNonNull) {
661 if (AllowNullPointers) {
662 // When performing pointer casts, it's OK if the value is null.
663 // Skip the remaining checks in that case.
664 Done = createBasicBlock("null");
665 llvm::BasicBlock *Rest = createBasicBlock("not.null");
666 Builder.CreateCondBr(IsNonNull, Rest, Done);
667 EmitBlock(Rest);
668 } else {
669 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
670 }
671 }
672 }
673
674 if (SanOpts.has(SanitizerKind::ObjectSize) &&
675 !SkippedChecks.has(SanitizerKind::ObjectSize) &&
676 !Ty->isIncompleteType()) {
677 uint64_t Size = getContext().getTypeSizeInChars(Ty).getQuantity();
678
679 // The glvalue must refer to a large enough storage region.
680 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
681 // to check this.
682 // FIXME: Get object address space
683 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
684 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
685 llvm::Value *Min = Builder.getFalse();
686 llvm::Value *NullIsUnknown = Builder.getFalse();
687 llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
688 llvm::Value *LargeEnough = Builder.CreateICmpUGE(
689 Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown}),
690 llvm::ConstantInt::get(IntPtrTy, Size));
691 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
692 }
693
694 uint64_t AlignVal = 0;
695 llvm::Value *PtrAsInt = nullptr;
696
697 if (SanOpts.has(SanitizerKind::Alignment) &&
698 !SkippedChecks.has(SanitizerKind::Alignment)) {
699 AlignVal = Alignment.getQuantity();
700 if (!Ty->isIncompleteType() && !AlignVal)
701 AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
702
703 // The glvalue must be suitably aligned.
704 if (AlignVal > 1 &&
705 (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
706 PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
707 llvm::Value *Align = Builder.CreateAnd(
708 PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
709 llvm::Value *Aligned =
710 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
711 if (Aligned != True)
712 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
713 }
714 }
715
716 if (Checks.size() > 0) {
717 // Make sure we're not losing information. Alignment needs to be a power of
718 // 2
719 assert(!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal)(static_cast <bool> (!AlignVal || (uint64_t)1 << llvm
::Log2_64(AlignVal) == AlignVal) ? void (0) : __assert_fail (
"!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 719, __extension__ __PRETTY_FUNCTION__))
;
720 llvm::Constant *StaticData[] = {
721 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
722 llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
723 llvm::ConstantInt::get(Int8Ty, TCK)};
724 EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
725 PtrAsInt ? PtrAsInt : Ptr);
726 }
727
728 // If possible, check that the vptr indicates that there is a subobject of
729 // type Ty at offset zero within this object.
730 //
731 // C++11 [basic.life]p5,6:
732 // [For storage which does not refer to an object within its lifetime]
733 // The program has undefined behavior if:
734 // -- the [pointer or glvalue] is used to access a non-static data member
735 // or call a non-static member function
736 if (SanOpts.has(SanitizerKind::Vptr) &&
737 !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
738 // Ensure that the pointer is non-null before loading it. If there is no
739 // compile-time guarantee, reuse the run-time null check or emit a new one.
740 if (!IsGuaranteedNonNull) {
741 if (!IsNonNull)
742 IsNonNull = Builder.CreateIsNotNull(Ptr);
743 if (!Done)
744 Done = createBasicBlock("vptr.null");
745 llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
746 Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
747 EmitBlock(VptrNotNull);
748 }
749
750 // Compute a hash of the mangled name of the type.
751 //
752 // FIXME: This is not guaranteed to be deterministic! Move to a
753 // fingerprinting mechanism once LLVM provides one. For the time
754 // being the implementation happens to be deterministic.
755 SmallString<64> MangledName;
756 llvm::raw_svector_ostream Out(MangledName);
757 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
758 Out);
759
760 // Blacklist based on the mangled type.
761 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
762 SanitizerKind::Vptr, Out.str())) {
763 llvm::hash_code TypeHash = hash_value(Out.str());
764
765 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
766 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
767 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
768 Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
769 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
770 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
771
772 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
773 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
774
775 // Look the hash up in our cache.
776 const int CacheSize = 128;
777 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
778 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
779 "__ubsan_vptr_type_cache");
780 llvm::Value *Slot = Builder.CreateAnd(Hash,
781 llvm::ConstantInt::get(IntPtrTy,
782 CacheSize-1));
783 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
784 llvm::Value *CacheVal =
785 Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
786 getPointerAlign());
787
788 // If the hash isn't in the cache, call a runtime handler to perform the
789 // hard work of checking whether the vptr is for an object of the right
790 // type. This will either fill in the cache and return, or produce a
791 // diagnostic.
792 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
793 llvm::Constant *StaticData[] = {
794 EmitCheckSourceLocation(Loc),
795 EmitCheckTypeDescriptor(Ty),
796 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
797 llvm::ConstantInt::get(Int8Ty, TCK)
798 };
799 llvm::Value *DynamicData[] = { Ptr, Hash };
800 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
801 SanitizerHandler::DynamicTypeCacheMiss, StaticData,
802 DynamicData);
803 }
804 }
805
806 if (Done) {
807 Builder.CreateBr(Done);
808 EmitBlock(Done);
809 }
810}
811
812/// Determine whether this expression refers to a flexible array member in a
813/// struct. We disable array bounds checks for such members.
814static bool isFlexibleArrayMemberExpr(const Expr *E) {
815 // For compatibility with existing code, we treat arrays of length 0 or
816 // 1 as flexible array members.
817 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
818 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
819 if (CAT->getSize().ugt(1))
820 return false;
821 } else if (!isa<IncompleteArrayType>(AT))
822 return false;
823
824 E = E->IgnoreParens();
825
826 // A flexible array member must be the last member in the class.
827 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
828 // FIXME: If the base type of the member expr is not FD->getParent(),
829 // this should not be treated as a flexible array member access.
830 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
831 RecordDecl::field_iterator FI(
832 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
833 return ++FI == FD->getParent()->field_end();
834 }
835 } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
836 return IRE->getDecl()->getNextIvar() == nullptr;
837 }
838
839 return false;
840}
841
842llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
843 QualType EltTy) {
844 ASTContext &C = getContext();
845 uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
846 if (!EltSize)
847 return nullptr;
848
849 auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
850 if (!ArrayDeclRef)
851 return nullptr;
852
853 auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
854 if (!ParamDecl)
855 return nullptr;
856
857 auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
858 if (!POSAttr)
859 return nullptr;
860
861 // Don't load the size if it's a lower bound.
862 int POSType = POSAttr->getType();
863 if (POSType != 0 && POSType != 1)
864 return nullptr;
865
866 // Find the implicit size parameter.
867 auto PassedSizeIt = SizeArguments.find(ParamDecl);
868 if (PassedSizeIt == SizeArguments.end())
869 return nullptr;
870
871 const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
872 assert(LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable")(static_cast <bool> (LocalDeclMap.count(PassedSizeDecl)
&& "Passed size not loadable") ? void (0) : __assert_fail
("LocalDeclMap.count(PassedSizeDecl) && \"Passed size not loadable\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 872, __extension__ __PRETTY_FUNCTION__))
;
873 Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
874 llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
875 C.getSizeType(), E->getExprLoc());
876 llvm::Value *SizeOfElement =
877 llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
878 return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
879}
880
881/// If Base is known to point to the start of an array, return the length of
882/// that array. Return 0 if the length cannot be determined.
883static llvm::Value *getArrayIndexingBound(
884 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
885 // For the vector indexing extension, the bound is the number of elements.
886 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
887 IndexedType = Base->getType();
888 return CGF.Builder.getInt32(VT->getNumElements());
889 }
890
891 Base = Base->IgnoreParens();
892
893 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
894 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
895 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
896 IndexedType = CE->getSubExpr()->getType();
897 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
898 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
899 return CGF.Builder.getInt(CAT->getSize());
900 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
901 return CGF.getVLASize(VAT).NumElts;
902 // Ignore pass_object_size here. It's not applicable on decayed pointers.
903 }
904 }
905
906 QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
907 if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
908 IndexedType = Base->getType();
909 return POS;
910 }
911
912 return nullptr;
913}
914
915void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
916 llvm::Value *Index, QualType IndexType,
917 bool Accessed) {
918 assert(SanOpts.has(SanitizerKind::ArrayBounds) &&(static_cast <bool> (SanOpts.has(SanitizerKind::ArrayBounds
) && "should not be called unless adding bounds checks"
) ? void (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 919, __extension__ __PRETTY_FUNCTION__))
919 "should not be called unless adding bounds checks")(static_cast <bool> (SanOpts.has(SanitizerKind::ArrayBounds
) && "should not be called unless adding bounds checks"
) ? void (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 919, __extension__ __PRETTY_FUNCTION__))
;
920 SanitizerScope SanScope(this);
921
922 QualType IndexedType;
923 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
924 if (!Bound)
925 return;
926
927 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
928 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
929 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
930
931 llvm::Constant *StaticData[] = {
932 EmitCheckSourceLocation(E->getExprLoc()),
933 EmitCheckTypeDescriptor(IndexedType),
934 EmitCheckTypeDescriptor(IndexType)
935 };
936 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
937 : Builder.CreateICmpULE(IndexVal, BoundVal);
938 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
939 SanitizerHandler::OutOfBounds, StaticData, Index);
940}
941
942
943CodeGenFunction::ComplexPairTy CodeGenFunction::
944EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
945 bool isInc, bool isPre) {
946 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
947
948 llvm::Value *NextVal;
949 if (isa<llvm::IntegerType>(InVal.first->getType())) {
950 uint64_t AmountVal = isInc ? 1 : -1;
951 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
952
953 // Add the inc/dec to the real part.
954 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
955 } else {
956 QualType ElemTy = E->getType()->getAs<ComplexType>()->getElementType();
957 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
958 if (!isInc)
959 FVal.changeSign();
960 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
961
962 // Add the inc/dec to the real part.
963 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
964 }
965
966 ComplexPairTy IncVal(NextVal, InVal.second);
967
968 // Store the updated result through the lvalue.
969 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
970
971 // If this is a postinc, return the value read from memory, otherwise use the
972 // updated value.
973 return isPre ? IncVal : InVal;
974}
975
976void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
977 CodeGenFunction *CGF) {
978 // Bind VLAs in the cast type.
979 if (CGF && E->getType()->isVariablyModifiedType())
980 CGF->EmitVariablyModifiedType(E->getType());
981
982 if (CGDebugInfo *DI = getModuleDebugInfo())
983 DI->EmitExplicitCastType(E->getType());
984}
985
986//===----------------------------------------------------------------------===//
987// LValue Expression Emission
988//===----------------------------------------------------------------------===//
989
990/// EmitPointerWithAlignment - Given an expression of pointer type, try to
991/// derive a more accurate bound on the alignment of the pointer.
992Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
993 LValueBaseInfo *BaseInfo,
994 TBAAAccessInfo *TBAAInfo) {
995 // We allow this with ObjC object pointers because of fragile ABIs.
996 assert(E->getType()->isPointerType() ||(static_cast <bool> (E->getType()->isPointerType(
) || E->getType()->isObjCObjectPointerType()) ? void (0
) : __assert_fail ("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 997, __extension__ __PRETTY_FUNCTION__))
997 E->getType()->isObjCObjectPointerType())(static_cast <bool> (E->getType()->isPointerType(
) || E->getType()->isObjCObjectPointerType()) ? void (0
) : __assert_fail ("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 997, __extension__ __PRETTY_FUNCTION__))
;
998 E = E->IgnoreParens();
999
1000 // Casts:
1001 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
1002 if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
1003 CGM.EmitExplicitCastExprType(ECE, this);
1004
1005 switch (CE->getCastKind()) {
1006 // Non-converting casts (but not C's implicit conversion from void*).
1007 case CK_BitCast:
1008 case CK_NoOp:
1009 case CK_AddressSpaceConversion:
1010 if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
1011 if (PtrTy->getPointeeType()->isVoidType())
1012 break;
1013
1014 LValueBaseInfo InnerBaseInfo;
1015 TBAAAccessInfo InnerTBAAInfo;
1016 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
1017 &InnerBaseInfo,
1018 &InnerTBAAInfo);
1019 if (BaseInfo) *BaseInfo = InnerBaseInfo;
1020 if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
1021
1022 if (isa<ExplicitCastExpr>(CE)) {
1023 LValueBaseInfo TargetTypeBaseInfo;
1024 TBAAAccessInfo TargetTypeTBAAInfo;
1025 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(),
1026 &TargetTypeBaseInfo,
1027 &TargetTypeTBAAInfo);
1028 if (TBAAInfo)
1029 *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
1030 TargetTypeTBAAInfo);
1031 // If the source l-value is opaque, honor the alignment of the
1032 // casted-to type.
1033 if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
1034 if (BaseInfo)
1035 BaseInfo->mergeForCast(TargetTypeBaseInfo);
1036 Addr = Address(Addr.getPointer(), Align);
1037 }
1038 }
1039
1040 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
1041 CE->getCastKind() == CK_BitCast) {
1042 if (auto PT = E->getType()->getAs<PointerType>())
1043 EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
1044 /*MayBeNull=*/true,
1045 CodeGenFunction::CFITCK_UnrelatedCast,
1046 CE->getLocStart());
1047 }
1048 return CE->getCastKind() != CK_AddressSpaceConversion
1049 ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
1050 : Builder.CreateAddrSpaceCast(Addr,
1051 ConvertType(E->getType()));
1052 }
1053 break;
1054
1055 // Array-to-pointer decay.
1056 case CK_ArrayToPointerDecay:
1057 return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
1058
1059 // Derived-to-base conversions.
1060 case CK_UncheckedDerivedToBase:
1061 case CK_DerivedToBase: {
1062 // TODO: Support accesses to members of base classes in TBAA. For now, we
1063 // conservatively pretend that the complete object is of the base class
1064 // type.
1065 if (TBAAInfo)
1066 *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
1067 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
1068 auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
1069 return GetAddressOfBaseClass(Addr, Derived,
1070 CE->path_begin(), CE->path_end(),
1071 ShouldNullCheckClassCastValue(CE),
1072 CE->getExprLoc());
1073 }
1074
1075 // TODO: Is there any reason to treat base-to-derived conversions
1076 // specially?
1077 default:
1078 break;
1079 }
1080 }
1081
1082 // Unary &.
1083 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
1084 if (UO->getOpcode() == UO_AddrOf) {
1085 LValue LV = EmitLValue(UO->getSubExpr());
1086 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
1087 if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
1088 return LV.getAddress();
1089 }
1090 }
1091
1092 // TODO: conditional operators, comma.
1093
1094 // Otherwise, use the alignment of the type.
1095 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), BaseInfo,
1096 TBAAInfo);
1097 return Address(EmitScalarExpr(E), Align);
1098}
1099
1100RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
1101 if (Ty->isVoidType())
1102 return RValue::get(nullptr);
1103
1104 switch (getEvaluationKind(Ty)) {
1105 case TEK_Complex: {
1106 llvm::Type *EltTy =
1107 ConvertType(Ty->castAs<ComplexType>()->getElementType());
1108 llvm::Value *U = llvm::UndefValue::get(EltTy);
1109 return RValue::getComplex(std::make_pair(U, U));
1110 }
1111
1112 // If this is a use of an undefined aggregate type, the aggregate must have an
1113 // identifiable address. Just because the contents of the value are undefined
1114 // doesn't mean that the address can't be taken and compared.
1115 case TEK_Aggregate: {
1116 Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
1117 return RValue::getAggregate(DestPtr);
1118 }
1119
1120 case TEK_Scalar:
1121 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
1122 }
1123 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1123)
;
1124}
1125
1126RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
1127 const char *Name) {
1128 ErrorUnsupported(E, Name);
1129 return GetUndefRValue(E->getType());
1130}
1131
1132LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
1133 const char *Name) {
1134 ErrorUnsupported(E, Name);
1135 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
1136 return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
1137 E->getType());
1138}
1139
1140bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
1141 const Expr *Base = Obj;
1142 while (!isa<CXXThisExpr>(Base)) {
1143 // The result of a dynamic_cast can be null.
1144 if (isa<CXXDynamicCastExpr>(Base))
1145 return false;
1146
1147 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
1148 Base = CE->getSubExpr();
1149 } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
1150 Base = PE->getSubExpr();
1151 } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
1152 if (UO->getOpcode() == UO_Extension)
1153 Base = UO->getSubExpr();
1154 else
1155 return false;
1156 } else {
1157 return false;
1158 }
1159 }
1160 return true;
1161}
1162
1163LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
1164 LValue LV;
1165 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
1166 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
1167 else
1168 LV = EmitLValue(E);
1169 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
1170 SanitizerSet SkippedChecks;
1171 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
1172 bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
1173 if (IsBaseCXXThis)
1174 SkippedChecks.set(SanitizerKind::Alignment, true);
1175 if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
1176 SkippedChecks.set(SanitizerKind::Null, true);
1177 }
1178 EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(),
1179 E->getType(), LV.getAlignment(), SkippedChecks);
1180 }
1181 return LV;
1182}
1183
1184/// EmitLValue - Emit code to compute a designator that specifies the location
1185/// of the expression.
1186///
1187/// This can return one of two things: a simple address or a bitfield reference.
1188/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1189/// an LLVM pointer type.
1190///
1191/// If this returns a bitfield reference, nothing about the pointee type of the
1192/// LLVM value is known: For example, it may not be a pointer to an integer.
1193///
1194/// If this returns a normal address, and if the lvalue's C type is fixed size,
1195/// this method guarantees that the returned pointer type will point to an LLVM
1196/// type of the same size of the lvalue's type. If the lvalue has a variable
1197/// length type, this is not possible.
1198///
1199LValue CodeGenFunction::EmitLValue(const Expr *E) {
1200 ApplyDebugLocation DL(*this, E);
1201 switch (E->getStmtClass()) {
1202 default: return EmitUnsupportedLValue(E, "l-value expression");
1203
1204 case Expr::ObjCPropertyRefExprClass:
1205 llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1205)
;
1206
1207 case Expr::ObjCSelectorExprClass:
1208 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
1209 case Expr::ObjCIsaExprClass:
1210 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
1211 case Expr::BinaryOperatorClass:
1212 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
1213 case Expr::CompoundAssignOperatorClass: {
1214 QualType Ty = E->getType();
1215 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1216 Ty = AT->getValueType();
1217 if (!Ty->isAnyComplexType())
1218 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1219 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1220 }
1221 case Expr::CallExprClass:
1222 case Expr::CXXMemberCallExprClass:
1223 case Expr::CXXOperatorCallExprClass:
1224 case Expr::UserDefinedLiteralClass:
1225 return EmitCallExprLValue(cast<CallExpr>(E));
1226 case Expr::VAArgExprClass:
1227 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
1228 case Expr::DeclRefExprClass:
1229 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
1230 case Expr::ParenExprClass:
1231 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
1232 case Expr::GenericSelectionExprClass:
1233 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
1234 case Expr::PredefinedExprClass:
1235 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
1236 case Expr::StringLiteralClass:
1237 return EmitStringLiteralLValue(cast<StringLiteral>(E));
1238 case Expr::ObjCEncodeExprClass:
1239 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
1240 case Expr::PseudoObjectExprClass:
1241 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
1242 case Expr::InitListExprClass:
1243 return EmitInitListLValue(cast<InitListExpr>(E));
1244 case Expr::CXXTemporaryObjectExprClass:
1245 case Expr::CXXConstructExprClass:
1246 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
1247 case Expr::CXXBindTemporaryExprClass:
1248 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
1249 case Expr::CXXUuidofExprClass:
1250 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
1251 case Expr::LambdaExprClass:
1252 return EmitLambdaLValue(cast<LambdaExpr>(E));
1253
1254 case Expr::ExprWithCleanupsClass: {
1255 const auto *cleanups = cast<ExprWithCleanups>(E);
1256 enterFullExpression(cleanups);
1257 RunCleanupsScope Scope(*this);
1258 LValue LV = EmitLValue(cleanups->getSubExpr());
1259 if (LV.isSimple()) {
1260 // Defend against branches out of gnu statement expressions surrounded by
1261 // cleanups.
1262 llvm::Value *V = LV.getPointer();
1263 Scope.ForceCleanup({&V});
1264 return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
1265 getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
1266 }
1267 // FIXME: Is it possible to create an ExprWithCleanups that produces a
1268 // bitfield lvalue or some other non-simple lvalue?
1269 return LV;
1270 }
1271
1272 case Expr::CXXDefaultArgExprClass:
1273 return EmitLValue(cast<CXXDefaultArgExpr>(E)->getExpr());
1274 case Expr::CXXDefaultInitExprClass: {
1275 CXXDefaultInitExprScope Scope(*this);
1276 return EmitLValue(cast<CXXDefaultInitExpr>(E)->getExpr());
1277 }
1278 case Expr::CXXTypeidExprClass:
1279 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
1280
1281 case Expr::ObjCMessageExprClass:
1282 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
1283 case Expr::ObjCIvarRefExprClass:
1284 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
1285 case Expr::StmtExprClass:
1286 return EmitStmtExprLValue(cast<StmtExpr>(E));
1287 case Expr::UnaryOperatorClass:
1288 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
1289 case Expr::ArraySubscriptExprClass:
1290 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
1291 case Expr::OMPArraySectionExprClass:
1292 return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
1293 case Expr::ExtVectorElementExprClass:
1294 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
1295 case Expr::MemberExprClass:
1296 return EmitMemberExpr(cast<MemberExpr>(E));
1297 case Expr::CompoundLiteralExprClass:
1298 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
1299 case Expr::ConditionalOperatorClass:
1300 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
1301 case Expr::BinaryConditionalOperatorClass:
1302 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
1303 case Expr::ChooseExprClass:
1304 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
1305 case Expr::OpaqueValueExprClass:
1306 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
1307 case Expr::SubstNonTypeTemplateParmExprClass:
1308 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
1309 case Expr::ImplicitCastExprClass:
1310 case Expr::CStyleCastExprClass:
1311 case Expr::CXXFunctionalCastExprClass:
1312 case Expr::CXXStaticCastExprClass:
1313 case Expr::CXXDynamicCastExprClass:
1314 case Expr::CXXReinterpretCastExprClass:
1315 case Expr::CXXConstCastExprClass:
1316 case Expr::ObjCBridgedCastExprClass:
1317 return EmitCastLValue(cast<CastExpr>(E));
1318
1319 case Expr::MaterializeTemporaryExprClass:
1320 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
1321
1322 case Expr::CoawaitExprClass:
1323 return EmitCoawaitLValue(cast<CoawaitExpr>(E));
1324 case Expr::CoyieldExprClass:
1325 return EmitCoyieldLValue(cast<CoyieldExpr>(E));
1326 }
1327}
1328
1329/// Given an object of the given canonical type, can we safely copy a
1330/// value out of it based on its initializer?
1331static bool isConstantEmittableObjectType(QualType type) {
1332 assert(type.isCanonical())(static_cast <bool> (type.isCanonical()) ? void (0) : __assert_fail
("type.isCanonical()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1332, __extension__ __PRETTY_FUNCTION__))
;
1333 assert(!type->isReferenceType())(static_cast <bool> (!type->isReferenceType()) ? void
(0) : __assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1333, __extension__ __PRETTY_FUNCTION__))
;
1334
1335 // Must be const-qualified but non-volatile.
1336 Qualifiers qs = type.getLocalQualifiers();
1337 if (!qs.hasConst() || qs.hasVolatile()) return false;
1338
1339 // Otherwise, all object types satisfy this except C++ classes with
1340 // mutable subobjects or non-trivial copy/destroy behavior.
1341 if (const auto *RT = dyn_cast<RecordType>(type))
1342 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1343 if (RD->hasMutableFields() || !RD->isTrivial())
1344 return false;
1345
1346 return true;
1347}
1348
1349/// Can we constant-emit a load of a reference to a variable of the
1350/// given type? This is different from predicates like
1351/// Decl::isUsableInConstantExpressions because we do want it to apply
1352/// in situations that don't necessarily satisfy the language's rules
1353/// for this (e.g. C++'s ODR-use rules). For example, we want to able
1354/// to do this with const float variables even if those variables
1355/// aren't marked 'constexpr'.
1356enum ConstantEmissionKind {
1357 CEK_None,
1358 CEK_AsReferenceOnly,
1359 CEK_AsValueOrReference,
1360 CEK_AsValueOnly
1361};
1362static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
1363 type = type.getCanonicalType();
1364 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
1365 if (isConstantEmittableObjectType(ref->getPointeeType()))
1366 return CEK_AsValueOrReference;
1367 return CEK_AsReferenceOnly;
1368 }
1369 if (isConstantEmittableObjectType(type))
1370 return CEK_AsValueOnly;
1371 return CEK_None;
1372}
1373
1374/// Try to emit a reference to the given value without producing it as
1375/// an l-value. This is actually more than an optimization: we can't
1376/// produce an l-value for variables that we never actually captured
1377/// in a block or lambda, which means const int variables or constexpr
1378/// literals or similar.
1379CodeGenFunction::ConstantEmission
1380CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1381 ValueDecl *value = refExpr->getDecl();
1382
1383 // The value needs to be an enum constant or a constant variable.
1384 ConstantEmissionKind CEK;
1385 if (isa<ParmVarDecl>(value)) {
1386 CEK = CEK_None;
1387 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1388 CEK = checkVarTypeForConstantEmission(var->getType());
1389 } else if (isa<EnumConstantDecl>(value)) {
1390 CEK = CEK_AsValueOnly;
1391 } else {
1392 CEK = CEK_None;
1393 }
1394 if (CEK == CEK_None) return ConstantEmission();
1395
1396 Expr::EvalResult result;
1397 bool resultIsReference;
1398 QualType resultType;
1399
1400 // It's best to evaluate all the way as an r-value if that's permitted.
1401 if (CEK != CEK_AsReferenceOnly &&
1402 refExpr->EvaluateAsRValue(result, getContext())) {
1403 resultIsReference = false;
1404 resultType = refExpr->getType();
1405
1406 // Otherwise, try to evaluate as an l-value.
1407 } else if (CEK != CEK_AsValueOnly &&
1408 refExpr->EvaluateAsLValue(result, getContext())) {
1409 resultIsReference = true;
1410 resultType = value->getType();
1411
1412 // Failure.
1413 } else {
1414 return ConstantEmission();
1415 }
1416
1417 // In any case, if the initializer has side-effects, abandon ship.
1418 if (result.HasSideEffects)
1419 return ConstantEmission();
1420
1421 // Emit as a constant.
1422 auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
1423 result.Val, resultType);
1424
1425 // Make sure we emit a debug reference to the global variable.
1426 // This should probably fire even for
1427 if (isa<VarDecl>(value)) {
1428 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1429 EmitDeclRefExprDbgValue(refExpr, result.Val);
1430 } else {
1431 assert(isa<EnumConstantDecl>(value))(static_cast <bool> (isa<EnumConstantDecl>(value)
) ? void (0) : __assert_fail ("isa<EnumConstantDecl>(value)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1431, __extension__ __PRETTY_FUNCTION__))
;
1432 EmitDeclRefExprDbgValue(refExpr, result.Val);
1433 }
1434
1435 // If we emitted a reference constant, we need to dereference that.
1436 if (resultIsReference)
1437 return ConstantEmission::forReference(C);
1438
1439 return ConstantEmission::forValue(C);
1440}
1441
1442static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
1443 const MemberExpr *ME) {
1444 if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
1445 // Try to emit static variable member expressions as DREs.
1446 return DeclRefExpr::Create(
1447 CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
1448 /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
1449 ME->getType(), ME->getValueKind());
1450 }
1451 return nullptr;
1452}
1453
1454CodeGenFunction::ConstantEmission
1455CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
1456 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
1457 return tryEmitAsConstant(DRE);
1458 return ConstantEmission();
1459}
1460
1461llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1462 SourceLocation Loc) {
1463 return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
1464 lvalue.getType(), Loc, lvalue.getBaseInfo(),
1465 lvalue.getTBAAInfo(), lvalue.isNontemporal());
1466}
1467
1468static bool hasBooleanRepresentation(QualType Ty) {
1469 if (Ty->isBooleanType())
1470 return true;
1471
1472 if (const EnumType *ET = Ty->getAs<EnumType>())
1473 return ET->getDecl()->getIntegerType()->isBooleanType();
1474
1475 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1476 return hasBooleanRepresentation(AT->getValueType());
1477
1478 return false;
1479}
1480
1481static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1482 llvm::APInt &Min, llvm::APInt &End,
1483 bool StrictEnums, bool IsBool) {
1484 const EnumType *ET = Ty->getAs<EnumType>();
1485 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1486 ET && !ET->getDecl()->isFixed();
1487 if (!IsBool && !IsRegularCPlusPlusEnum)
1488 return false;
1489
1490 if (IsBool) {
1491 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1492 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1493 } else {
1494 const EnumDecl *ED = ET->getDecl();
1495 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1496 unsigned Bitwidth = LTy->getScalarSizeInBits();
1497 unsigned NumNegativeBits = ED->getNumNegativeBits();
1498 unsigned NumPositiveBits = ED->getNumPositiveBits();
1499
1500 if (NumNegativeBits) {
1501 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1502 assert(NumBits <= Bitwidth)(static_cast <bool> (NumBits <= Bitwidth) ? void (0)
: __assert_fail ("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1502, __extension__ __PRETTY_FUNCTION__))
;
1503 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1504 Min = -End;
1505 } else {
1506 assert(NumPositiveBits <= Bitwidth)(static_cast <bool> (NumPositiveBits <= Bitwidth) ? void
(0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1506, __extension__ __PRETTY_FUNCTION__))
;
1507 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1508 Min = llvm::APInt(Bitwidth, 0);
1509 }
1510 }
1511 return true;
1512}
1513
1514llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1515 llvm::APInt Min, End;
1516 if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
1517 hasBooleanRepresentation(Ty)))
1518 return nullptr;
1519
1520 llvm::MDBuilder MDHelper(getLLVMContext());
1521 return MDHelper.createRange(Min, End);
1522}
1523
1524bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
1525 SourceLocation Loc) {
1526 bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
1527 bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
1528 if (!HasBoolCheck && !HasEnumCheck)
1529 return false;
1530
1531 bool IsBool = hasBooleanRepresentation(Ty) ||
1532 NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
1533 bool NeedsBoolCheck = HasBoolCheck && IsBool;
1534 bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
1535 if (!NeedsBoolCheck && !NeedsEnumCheck)
1536 return false;
1537
1538 // Single-bit booleans don't need to be checked. Special-case this to avoid
1539 // a bit width mismatch when handling bitfield values. This is handled by
1540 // EmitFromMemory for the non-bitfield case.
1541 if (IsBool &&
1542 cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
1543 return false;
1544
1545 llvm::APInt Min, End;
1546 if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
1547 return true;
1548
1549 auto &Ctx = getLLVMContext();
1550 SanitizerScope SanScope(this);
1551 llvm::Value *Check;
1552 --End;
1553 if (!Min) {
1554 Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
1555 } else {
1556 llvm::Value *Upper =
1557 Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
1558 llvm::Value *Lower =
1559 Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
1560 Check = Builder.CreateAnd(Upper, Lower);
1561 }
1562 llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
1563 EmitCheckTypeDescriptor(Ty)};
1564 SanitizerMask Kind =
1565 NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1566 EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
1567 StaticArgs, EmitCheckValue(Value));
1568 return true;
1569}
1570
1571llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
1572 QualType Ty,
1573 SourceLocation Loc,
1574 LValueBaseInfo BaseInfo,
1575 TBAAAccessInfo TBAAInfo,
1576 bool isNontemporal) {
1577 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1578 // For better performance, handle vector loads differently.
1579 if (Ty->isVectorType()) {
1580 const llvm::Type *EltTy = Addr.getElementType();
1581
1582 const auto *VTy = cast<llvm::VectorType>(EltTy);
1583
1584 // Handle vectors of size 3 like size 4 for better performance.
1585 if (VTy->getNumElements() == 3) {
1586
1587 // Bitcast to vec4 type.
1588 llvm::VectorType *vec4Ty =
1589 llvm::VectorType::get(VTy->getElementType(), 4);
1590 Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
1591 // Now load value.
1592 llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1593
1594 // Shuffle vector to get vec3.
1595 V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
1596 {0, 1, 2}, "extractVec");
1597 return EmitFromMemory(V, Ty);
1598 }
1599 }
1600 }
1601
1602 // Atomic operations have to be done on integral types.
1603 LValue AtomicLValue =
1604 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1605 if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
1606 return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
1607 }
1608
1609 llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
1610 if (isNontemporal) {
1611 llvm::MDNode *Node = llvm::MDNode::get(
1612 Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1613 Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1614 }
1615
1616 CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
1617
1618 if (EmitScalarRangeCheck(Load, Ty, Loc)) {
1619 // In order to prevent the optimizer from throwing away the check, don't
1620 // attach range metadata to the load.
1621 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1622 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1623 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1624
1625 return EmitFromMemory(Load, Ty);
1626}
1627
1628llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1629 // Bool has a different representation in memory than in registers.
1630 if (hasBooleanRepresentation(Ty)) {
1631 // This should really always be an i1, but sometimes it's already
1632 // an i8, and it's awkward to track those cases down.
1633 if (Value->getType()->isIntegerTy(1))
1634 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1635 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&(static_cast <bool> (Value->getType()->isIntegerTy
(getContext().getTypeSize(Ty)) && "wrong value rep of bool"
) ? void (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1636, __extension__ __PRETTY_FUNCTION__))
1636 "wrong value rep of bool")(static_cast <bool> (Value->getType()->isIntegerTy
(getContext().getTypeSize(Ty)) && "wrong value rep of bool"
) ? void (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1636, __extension__ __PRETTY_FUNCTION__))
;
1637 }
1638
1639 return Value;
1640}
1641
1642llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1643 // Bool has a different representation in memory than in registers.
1644 if (hasBooleanRepresentation(Ty)) {
1645 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&(static_cast <bool> (Value->getType()->isIntegerTy
(getContext().getTypeSize(Ty)) && "wrong value rep of bool"
) ? void (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1646, __extension__ __PRETTY_FUNCTION__))
1646 "wrong value rep of bool")(static_cast <bool> (Value->getType()->isIntegerTy
(getContext().getTypeSize(Ty)) && "wrong value rep of bool"
) ? void (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1646, __extension__ __PRETTY_FUNCTION__))
;
1647 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1648 }
1649
1650 return Value;
1651}
1652
1653void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
1654 bool Volatile, QualType Ty,
1655 LValueBaseInfo BaseInfo,
1656 TBAAAccessInfo TBAAInfo,
1657 bool isInit, bool isNontemporal) {
1658 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1659 // Handle vectors differently to get better performance.
1660 if (Ty->isVectorType()) {
1661 llvm::Type *SrcTy = Value->getType();
1662 auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
1663 // Handle vec3 special.
1664 if (VecTy && VecTy->getNumElements() == 3) {
1665 // Our source is a vec3, do a shuffle vector to make it a vec4.
1666 llvm::Constant *Mask[] = {Builder.getInt32(0), Builder.getInt32(1),
1667 Builder.getInt32(2),
1668 llvm::UndefValue::get(Builder.getInt32Ty())};
1669 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1670 Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
1671 MaskV, "extractVec");
1672 SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
1673 }
1674 if (Addr.getElementType() != SrcTy) {
1675 Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
1676 }
1677 }
1678 }
1679
1680 Value = EmitToMemory(Value, Ty);
1681
1682 LValue AtomicLValue =
1683 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1684 if (Ty->isAtomicType() ||
1685 (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
1686 EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
1687 return;
1688 }
1689
1690 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1691 if (isNontemporal) {
1692 llvm::MDNode *Node =
1693 llvm::MDNode::get(Store->getContext(),
1694 llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1695 Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1696 }
1697
1698 CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
1699}
1700
1701void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1702 bool isInit) {
1703 EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
1704 lvalue.getType(), lvalue.getBaseInfo(),
1705 lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1706}
1707
1708/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1709/// method emits the address of the lvalue, then loads the result as an rvalue,
1710/// returning the rvalue.
1711RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1712 if (LV.isObjCWeak()) {
1713 // load of a __weak object.
1714 Address AddrWeakObj = LV.getAddress();
1715 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1716 AddrWeakObj));
1717 }
1718 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1719 // In MRC mode, we do a load+autorelease.
1720 if (!getLangOpts().ObjCAutoRefCount) {
1721 return RValue::get(EmitARCLoadWeak(LV.getAddress()));
1722 }
1723
1724 // In ARC mode, we load retained and then consume the value.
1725 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
1726 Object = EmitObjCConsumeObject(LV.getType(), Object);
1727 return RValue::get(Object);
1728 }
1729
1730 if (LV.isSimple()) {
1731 assert(!LV.getType()->isFunctionType())(static_cast <bool> (!LV.getType()->isFunctionType()
) ? void (0) : __assert_fail ("!LV.getType()->isFunctionType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1731, __extension__ __PRETTY_FUNCTION__))
;
1732
1733 // Everything needs a load.
1734 return RValue::get(EmitLoadOfScalar(LV, Loc));
1735 }
1736
1737 if (LV.isVectorElt()) {
1738 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
1739 LV.isVolatileQualified());
1740 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1741 "vecext"));
1742 }
1743
1744 // If this is a reference to a subset of the elements of a vector, either
1745 // shuffle the input or extract/insert them as appropriate.
1746 if (LV.isExtVectorElt())
1747 return EmitLoadOfExtVectorElementLValue(LV);
1748
1749 // Global Register variables always invoke intrinsics
1750 if (LV.isGlobalReg())
1751 return EmitLoadOfGlobalRegLValue(LV);
1752
1753 assert(LV.isBitField() && "Unknown LValue type!")(static_cast <bool> (LV.isBitField() && "Unknown LValue type!"
) ? void (0) : __assert_fail ("LV.isBitField() && \"Unknown LValue type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1753, __extension__ __PRETTY_FUNCTION__))
;
1754 return EmitLoadOfBitfieldLValue(LV, Loc);
1755}
1756
1757RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
1758 SourceLocation Loc) {
1759 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1760
1761 // Get the output type.
1762 llvm::Type *ResLTy = ConvertType(LV.getType());
1763
1764 Address Ptr = LV.getBitFieldAddress();
1765 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
1766
1767 if (Info.IsSigned) {
1768 assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize)(static_cast <bool> (static_cast<unsigned>(Info.Offset
+ Info.Size) <= Info.StorageSize) ? void (0) : __assert_fail
("static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1768, __extension__ __PRETTY_FUNCTION__))
;
1769 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1770 if (HighBits)
1771 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1772 if (Info.Offset + HighBits)
1773 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1774 } else {
1775 if (Info.Offset)
1776 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1777 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1778 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1779 Info.Size),
1780 "bf.clear");
1781 }
1782 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1783 EmitScalarRangeCheck(Val, LV.getType(), Loc);
1784 return RValue::get(Val);
1785}
1786
1787// If this is a reference to a subset of the elements of a vector, create an
1788// appropriate shufflevector.
1789RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1790 llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
1791 LV.isVolatileQualified());
1792
1793 const llvm::Constant *Elts = LV.getExtVectorElts();
1794
1795 // If the result of the expression is a non-vector type, we must be extracting
1796 // a single element. Just codegen as an extractelement.
1797 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1798 if (!ExprVT) {
1799 unsigned InIdx = getAccessedFieldNo(0, Elts);
1800 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1801 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1802 }
1803
1804 // Always use shuffle vector to try to retain the original program structure
1805 unsigned NumResultElts = ExprVT->getNumElements();
1806
1807 SmallVector<llvm::Constant*, 4> Mask;
1808 for (unsigned i = 0; i != NumResultElts; ++i)
1809 Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
1810
1811 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1812 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1813 MaskV);
1814 return RValue::get(Vec);
1815}
1816
1817/// Generates lvalue for partial ext_vector access.
1818Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1819 Address VectorAddress = LV.getExtVectorAddress();
1820 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1821 QualType EQT = ExprVT->getElementType();
1822 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1823
1824 Address CastToPointerElement =
1825 Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
1826 "conv.ptr.element");
1827
1828 const llvm::Constant *Elts = LV.getExtVectorElts();
1829 unsigned ix = getAccessedFieldNo(0, Elts);
1830
1831 Address VectorBasePtrPlusIx =
1832 Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
1833 getContext().getTypeSizeInChars(EQT),
1834 "vector.elt");
1835
1836 return VectorBasePtrPlusIx;
1837}
1838
1839/// Load of global gamed gegisters are always calls to intrinsics.
1840RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
1841 assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&(static_cast <bool> ((LV.getType()->isIntegerType() ||
LV.getType()->isPointerType()) && "Bad type for register variable"
) ? void (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1842, __extension__ __PRETTY_FUNCTION__))
1842 "Bad type for register variable")(static_cast <bool> ((LV.getType()->isIntegerType() ||
LV.getType()->isPointerType()) && "Bad type for register variable"
) ? void (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1842, __extension__ __PRETTY_FUNCTION__))
;
1843 llvm::MDNode *RegName = cast<llvm::MDNode>(
1844 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
1845
1846 // We accept integer and pointer types only
1847 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
1848 llvm::Type *Ty = OrigTy;
1849 if (OrigTy->isPointerTy())
1850 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
1851 llvm::Type *Types[] = { Ty };
1852
1853 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
1854 llvm::Value *Call = Builder.CreateCall(
1855 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
1856 if (OrigTy->isPointerTy())
1857 Call = Builder.CreateIntToPtr(Call, OrigTy);
1858 return RValue::get(Call);
1859}
1860
1861
1862/// EmitStoreThroughLValue - Store the specified rvalue into the specified
1863/// lvalue, where both are guaranteed to the have the same type, and that type
1864/// is 'Ty'.
1865void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
1866 bool isInit) {
1867 if (!Dst.isSimple()) {
1868 if (Dst.isVectorElt()) {
1869 // Read/modify/write the vector, inserting the new element.
1870 llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
1871 Dst.isVolatileQualified());
1872 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
1873 Dst.getVectorIdx(), "vecins");
1874 Builder.CreateStore(Vec, Dst.getVectorAddress(),
1875 Dst.isVolatileQualified());
1876 return;
1877 }
1878
1879 // If this is an update of extended vector elements, insert them as
1880 // appropriate.
1881 if (Dst.isExtVectorElt())
1882 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
1883
1884 if (Dst.isGlobalReg())
1885 return EmitStoreThroughGlobalRegLValue(Src, Dst);
1886
1887 assert(Dst.isBitField() && "Unknown LValue type")(static_cast <bool> (Dst.isBitField() && "Unknown LValue type"
) ? void (0) : __assert_fail ("Dst.isBitField() && \"Unknown LValue type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1887, __extension__ __PRETTY_FUNCTION__))
;
1888 return EmitStoreThroughBitfieldLValue(Src, Dst);
1889 }
1890
1891 // There's special magic for assigning into an ARC-qualified l-value.
1892 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
1893 switch (Lifetime) {
1894 case Qualifiers::OCL_None:
1895 llvm_unreachable("present but none")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1895)
;
1896
1897 case Qualifiers::OCL_ExplicitNone:
1898 // nothing special
1899 break;
1900
1901 case Qualifiers::OCL_Strong:
1902 if (isInit) {
1903 Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
1904 break;
1905 }
1906 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
1907 return;
1908
1909 case Qualifiers::OCL_Weak:
1910 if (isInit)
1911 // Initialize and then skip the primitive store.
1912 EmitARCInitWeak(Dst.getAddress(), Src.getScalarVal());
1913 else
1914 EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
1915 return;
1916
1917 case Qualifiers::OCL_Autoreleasing:
1918 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
1919 Src.getScalarVal()));
1920 // fall into the normal path
1921 break;
1922 }
1923 }
1924
1925 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
1926 // load of a __weak object.
1927 Address LvalueDst = Dst.getAddress();
1928 llvm::Value *src = Src.getScalarVal();
1929 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
1930 return;
1931 }
1932
1933 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
1934 // load of a __strong object.
1935 Address LvalueDst = Dst.getAddress();
1936 llvm::Value *src = Src.getScalarVal();
1937 if (Dst.isObjCIvar()) {
1938 assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL")(static_cast <bool> (Dst.getBaseIvarExp() && "BaseIvarExp is NULL"
) ? void (0) : __assert_fail ("Dst.getBaseIvarExp() && \"BaseIvarExp is NULL\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1938, __extension__ __PRETTY_FUNCTION__))
;
1939 llvm::Type *ResultType = IntPtrTy;
1940 Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
1941 llvm::Value *RHS = dst.getPointer();
1942 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
1943 llvm::Value *LHS =
1944 Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
1945 "sub.ptr.lhs.cast");
1946 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
1947 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
1948 BytesBetween);
1949 } else if (Dst.isGlobalObjCRef()) {
1950 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
1951 Dst.isThreadLocalRef());
1952 }
1953 else
1954 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
1955 return;
1956 }
1957
1958 assert(Src.isScalar() && "Can't emit an agg store with this method")(static_cast <bool> (Src.isScalar() && "Can't emit an agg store with this method"
) ? void (0) : __assert_fail ("Src.isScalar() && \"Can't emit an agg store with this method\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1958, __extension__ __PRETTY_FUNCTION__))
;
1959 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
1960}
1961
1962void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
1963 llvm::Value **Result) {
1964 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
1965 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
1966 Address Ptr = Dst.getBitFieldAddress();
1967
1968 // Get the source value, truncated to the width of the bit-field.
1969 llvm::Value *SrcVal = Src.getScalarVal();
1970
1971 // Cast the source to the storage type and shift it into place.
1972 SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
1973 /*IsSigned=*/false);
1974 llvm::Value *MaskedVal = SrcVal;
1975
1976 // See if there are other bits in the bitfield's storage we'll need to load
1977 // and mask together with source before storing.
1978 if (Info.StorageSize != Info.Size) {
1979 assert(Info.StorageSize > Info.Size && "Invalid bitfield size.")(static_cast <bool> (Info.StorageSize > Info.Size &&
"Invalid bitfield size.") ? void (0) : __assert_fail ("Info.StorageSize > Info.Size && \"Invalid bitfield size.\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1979, __extension__ __PRETTY_FUNCTION__))
;
1980 llvm::Value *Val =
1981 Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
1982
1983 // Mask the source value as needed.
1984 if (!hasBooleanRepresentation(Dst.getType()))
1985 SrcVal = Builder.CreateAnd(SrcVal,
1986 llvm::APInt::getLowBitsSet(Info.StorageSize,
1987 Info.Size),
1988 "bf.value");
1989 MaskedVal = SrcVal;
1990 if (Info.Offset)
1991 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
1992
1993 // Mask out the original value.
1994 Val = Builder.CreateAnd(Val,
1995 ~llvm::APInt::getBitsSet(Info.StorageSize,
1996 Info.Offset,
1997 Info.Offset + Info.Size),
1998 "bf.clear");
1999
2000 // Or together the unchanged values and the source value.
2001 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
2002 } else {
2003 assert(Info.Offset == 0)(static_cast <bool> (Info.Offset == 0) ? void (0) : __assert_fail
("Info.Offset == 0", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2003, __extension__ __PRETTY_FUNCTION__))
;
2004 }
2005
2006 // Write the new value back out.
2007 Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
2008
2009 // Return the new value of the bit-field, if requested.
2010 if (Result) {
2011 llvm::Value *ResultVal = MaskedVal;
2012
2013 // Sign extend the value if needed.
2014 if (Info.IsSigned) {
2015 assert(Info.Size <= Info.StorageSize)(static_cast <bool> (Info.Size <= Info.StorageSize) ?
void (0) : __assert_fail ("Info.Size <= Info.StorageSize"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2015, __extension__ __PRETTY_FUNCTION__))
;
2016 unsigned HighBits = Info.StorageSize - Info.Size;
2017 if (HighBits) {
2018 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
2019 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
2020 }
2021 }
2022
2023 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
2024 "bf.result.cast");
2025 *Result = EmitFromMemory(ResultVal, Dst.getType());
2026 }
2027}
2028
2029void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
2030 LValue Dst) {
2031 // This access turns into a read/modify/write of the vector. Load the input
2032 // value now.
2033 llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
2034 Dst.isVolatileQualified());
2035 const llvm::Constant *Elts = Dst.getExtVectorElts();
2036
2037 llvm::Value *SrcVal = Src.getScalarVal();
2038
2039 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
2040 unsigned NumSrcElts = VTy->getNumElements();
2041 unsigned NumDstElts = Vec->getType()->getVectorNumElements();
2042 if (NumDstElts == NumSrcElts) {
2043 // Use shuffle vector is the src and destination are the same number of
2044 // elements and restore the vector mask since it is on the side it will be
2045 // stored.
2046 SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
2047 for (unsigned i = 0; i != NumSrcElts; ++i)
2048 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
2049
2050 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2051 Vec = Builder.CreateShuffleVector(SrcVal,
2052 llvm::UndefValue::get(Vec->getType()),
2053 MaskV);
2054 } else if (NumDstElts > NumSrcElts) {
2055 // Extended the source vector to the same length and then shuffle it
2056 // into the destination.
2057 // FIXME: since we're shuffling with undef, can we just use the indices
2058 // into that? This could be simpler.
2059 SmallVector<llvm::Constant*, 4> ExtMask;
2060 for (unsigned i = 0; i != NumSrcElts; ++i)
2061 ExtMask.push_back(Builder.getInt32(i));
2062 ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
2063 llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
2064 llvm::Value *ExtSrcVal =
2065 Builder.CreateShuffleVector(SrcVal,
2066 llvm::UndefValue::get(SrcVal->getType()),
2067 ExtMaskV);
2068 // build identity
2069 SmallVector<llvm::Constant*, 4> Mask;
2070 for (unsigned i = 0; i != NumDstElts; ++i)
2071 Mask.push_back(Builder.getInt32(i));
2072
2073 // When the vector size is odd and .odd or .hi is used, the last element
2074 // of the Elts constant array will be one past the size of the vector.
2075 // Ignore the last element here, if it is greater than the mask size.
2076 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
2077 NumSrcElts--;
2078
2079 // modify when what gets shuffled in
2080 for (unsigned i = 0; i != NumSrcElts; ++i)
2081 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
2082 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2083 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
2084 } else {
2085 // We should never shorten the vector
2086 llvm_unreachable("unexpected shorten vector length")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2086)
;
2087 }
2088 } else {
2089 // If the Src is a scalar (not a vector) it must be updating one element.
2090 unsigned InIdx = getAccessedFieldNo(0, Elts);
2091 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
2092 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
2093 }
2094
2095 Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
2096 Dst.isVolatileQualified());
2097}
2098
2099/// Store of global named registers are always calls to intrinsics.
2100void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
2101 assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&(static_cast <bool> ((Dst.getType()->isIntegerType()
|| Dst.getType()->isPointerType()) && "Bad type for register variable"
) ? void (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2102, __extension__ __PRETTY_FUNCTION__))
2102 "Bad type for register variable")(static_cast <bool> ((Dst.getType()->isIntegerType()
|| Dst.getType()->isPointerType()) && "Bad type for register variable"
) ? void (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2102, __extension__ __PRETTY_FUNCTION__))
;
2103 llvm::MDNode *RegName = cast<llvm::MDNode>(
2104 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
2105 assert(RegName && "Register LValue is not metadata")(static_cast <bool> (RegName && "Register LValue is not metadata"
) ? void (0) : __assert_fail ("RegName && \"Register LValue is not metadata\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2105, __extension__ __PRETTY_FUNCTION__))
;
2106
2107 // We accept integer and pointer types only
2108 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
2109 llvm::Type *Ty = OrigTy;
2110 if (OrigTy->isPointerTy())
2111 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2112 llvm::Type *Types[] = { Ty };
2113
2114 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
2115 llvm::Value *Value = Src.getScalarVal();
2116 if (OrigTy->isPointerTy())
2117 Value = Builder.CreatePtrToInt(Value, Ty);
2118 Builder.CreateCall(
2119 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
2120}
2121
2122// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2123// generating write-barries API. It is currently a global, ivar,
2124// or neither.
2125static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
2126 LValue &LV,
2127 bool IsMemberAccess=false) {
2128 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
2129 return;
2130
2131 if (isa<ObjCIvarRefExpr>(E)) {
2132 QualType ExpTy = E->getType();
2133 if (IsMemberAccess && ExpTy->isPointerType()) {
2134 // If ivar is a structure pointer, assigning to field of
2135 // this struct follows gcc's behavior and makes it a non-ivar
2136 // writer-barrier conservatively.
2137 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
2138 if (ExpTy->isRecordType()) {
2139 LV.setObjCIvar(false);
2140 return;
2141 }
2142 }
2143 LV.setObjCIvar(true);
2144 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
2145 LV.setBaseIvarExp(Exp->getBase());
2146 LV.setObjCArray(E->getType()->isArrayType());
2147 return;
2148 }
2149
2150 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
2151 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
2152 if (VD->hasGlobalStorage()) {
2153 LV.setGlobalObjCRef(true);
2154 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
2155 }
2156 }
2157 LV.setObjCArray(E->getType()->isArrayType());
2158 return;
2159 }
2160
2161 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
2162 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2163 return;
2164 }
2165
2166 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
2167 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2168 if (LV.isObjCIvar()) {
2169 // If cast is to a structure pointer, follow gcc's behavior and make it
2170 // a non-ivar write-barrier.
2171 QualType ExpTy = E->getType();
2172 if (ExpTy->isPointerType())
2173 ExpTy = ExpTy->getAs<PointerType>()->getPointeeType();
2174 if (ExpTy->isRecordType())
2175 LV.setObjCIvar(false);
2176 }
2177 return;
2178 }
2179
2180 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
2181 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
2182 return;
2183 }
2184
2185 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
2186 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2187 return;
2188 }
2189
2190 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
2191 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2192 return;
2193 }
2194
2195 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
2196 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2197 return;
2198 }
2199
2200 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
2201 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
2202 if (LV.isObjCIvar() && !LV.isObjCArray())
2203 // Using array syntax to assigning to what an ivar points to is not
2204 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
2205 LV.setObjCIvar(false);
2206 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
2207 // Using array syntax to assigning to what global points to is not
2208 // same as assigning to the global itself. {id *G;} G[i] = 0;
2209 LV.setGlobalObjCRef(false);
2210 return;
2211 }
2212
2213 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
2214 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
2215 // We don't know if member is an 'ivar', but this flag is looked at
2216 // only in the context of LV.isObjCIvar().
2217 LV.setObjCArray(E->getType()->isArrayType());
2218 return;
2219 }
2220}
2221
2222static llvm::Value *
2223EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
2224 llvm::Value *V, llvm::Type *IRType,
2225 StringRef Name = StringRef()) {
2226 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2227 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
2228}
2229
2230static LValue EmitThreadPrivateVarDeclLValue(
2231 CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
2232 llvm::Type *RealVarTy, SourceLocation Loc) {
2233 Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
2234 Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
2235 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2236}
2237
2238static Address emitDeclTargetLinkVarDeclLValue(CodeGenFunction &CGF,
2239 const VarDecl *VD, QualType T) {
2240 for (const auto *D : VD->redecls()) {
2241 if (!VD->hasAttrs())
2242 continue;
2243 if (const auto *Attr = D->getAttr<OMPDeclareTargetDeclAttr>())
2244 if (Attr->getMapType() == OMPDeclareTargetDeclAttr::MT_Link) {
2245 QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
2246 Address Addr =
2247 CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetLink(VD);
2248 return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2249 }
2250 }
2251 return Address::invalid();
2252}
2253
2254Address
2255CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
2256 LValueBaseInfo *PointeeBaseInfo,
2257 TBAAAccessInfo *PointeeTBAAInfo) {
2258 llvm::LoadInst *Load = Builder.CreateLoad(RefLVal.getAddress(),
2259 RefLVal.isVolatile());
2260 CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
2261
2262 CharUnits Align = getNaturalTypeAlignment(RefLVal.getType()->getPointeeType(),
2263 PointeeBaseInfo, PointeeTBAAInfo,
2264 /* forPointeeType= */ true);
2265 return Address(Load, Align);
2266}
2267
2268LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
2269 LValueBaseInfo PointeeBaseInfo;
2270 TBAAAccessInfo PointeeTBAAInfo;
2271 Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
2272 &PointeeTBAAInfo);
2273 return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
2274 PointeeBaseInfo, PointeeTBAAInfo);
2275}
2276
2277Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
2278 const PointerType *PtrTy,
2279 LValueBaseInfo *BaseInfo,
2280 TBAAAccessInfo *TBAAInfo) {
2281 llvm::Value *Addr = Builder.CreateLoad(Ptr);
2282 return Address(Addr, getNaturalTypeAlignment(PtrTy->getPointeeType(),
2283 BaseInfo, TBAAInfo,
2284 /*forPointeeType=*/true));
2285}
2286
2287LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
2288 const PointerType *PtrTy) {
2289 LValueBaseInfo BaseInfo;
2290 TBAAAccessInfo TBAAInfo;
2291 Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
2292 return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
2293}
2294
2295static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
2296 const Expr *E, const VarDecl *VD) {
2297 QualType T = E->getType();
2298
2299 // If it's thread_local, emit a call to its wrapper function instead.
2300 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
2301 CGF.CGM.getCXXABI().usesThreadWrapperFunction())
2302 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
2303 // Check if the variable is marked as declare target with link clause in
2304 // device codegen.
2305 if (CGF.getLangOpts().OpenMPIsDevice) {
2306 Address Addr = emitDeclTargetLinkVarDeclLValue(CGF, VD, T);
2307 if (Addr.isValid())
2308 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2309 }
2310
2311 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2312 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2313 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
2314 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2315 Address Addr(V, Alignment);
2316 // Emit reference to the private copy of the variable if it is an OpenMP
2317 // threadprivate variable.
2318 if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
2319 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2320 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
2321 E->getExprLoc());
2322 }
2323 LValue LV = VD->getType()->isReferenceType() ?
2324 CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2325 AlignmentSource::Decl) :
2326 CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2327 setObjCGCLValueClass(CGF.getContext(), E, LV);
2328 return LV;
2329}
2330
2331static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
2332 const FunctionDecl *FD) {
2333 if (FD->hasAttr<WeakRefAttr>()) {
2334 ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
2335 return aliasee.getPointer();
2336 }
2337
2338 llvm::Constant *V = CGM.GetAddrOfFunction(FD);
2339 if (!FD->hasPrototype()) {
2340 if (const FunctionProtoType *Proto =
2341 FD->getType()->getAs<FunctionProtoType>()) {
2342 // Ugly case: for a K&R-style definition, the type of the definition
2343 // isn't the same as the type of a use. Correct for this with a
2344 // bitcast.
2345 QualType NoProtoType =
2346 CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
2347 NoProtoType = CGM.getContext().getPointerType(NoProtoType);
2348 V = llvm::ConstantExpr::getBitCast(V,
2349 CGM.getTypes().ConvertType(NoProtoType));
2350 }
2351 }
2352 return V;
2353}
2354
2355static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
2356 const Expr *E, const FunctionDecl *FD) {
2357 llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, FD);
2358 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
2359 return CGF.MakeAddrLValue(V, E->getType(), Alignment,
2360 AlignmentSource::Decl);
2361}
2362
2363static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
2364 llvm::Value *ThisValue) {
2365 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
2366 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
2367 return CGF.EmitLValueForField(LV, FD);
2368}
2369
2370/// Named Registers are named metadata pointing to the register name
2371/// which will be read from/written to as an argument to the intrinsic
2372/// @llvm.read/write_register.
2373/// So far, only the name is being passed down, but other options such as
2374/// register type, allocation type or even optimization options could be
2375/// passed down via the metadata node.
2376static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
2377 SmallString<64> Name("llvm.named.register.");
2378 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
2379 assert(Asm->getLabel().size() < 64-Name.size() &&(static_cast <bool> (Asm->getLabel().size() < 64-
Name.size() && "Register name too big") ? void (0) : __assert_fail
("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2380, __extension__ __PRETTY_FUNCTION__))
2380 "Register name too big")(static_cast <bool> (Asm->getLabel().size() < 64-
Name.size() && "Register name too big") ? void (0) : __assert_fail
("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2380, __extension__ __PRETTY_FUNCTION__))
;
2381 Name.append(Asm->getLabel());
2382 llvm::NamedMDNode *M =
2383 CGM.getModule().getOrInsertNamedMetadata(Name);
2384 if (M->getNumOperands() == 0) {
2385 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
2386 Asm->getLabel());
2387 llvm::Metadata *Ops[] = {Str};
2388 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
2389 }
2390
2391 CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
2392
2393 llvm::Value *Ptr =
2394 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
2395 return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
2396}
2397
2398LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
2399 const NamedDecl *ND = E->getDecl();
2400 QualType T = E->getType();
2401
2402 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2403 // Global Named registers access via intrinsics only
2404 if (VD->getStorageClass() == SC_Register &&
2405 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
2406 return EmitGlobalNamedRegister(VD, CGM);
2407
2408 // A DeclRefExpr for a reference initialized by a constant expression can
2409 // appear without being odr-used. Directly emit the constant initializer.
2410 const Expr *Init = VD->getAnyInitializer(VD);
2411 if (Init && !isa<ParmVarDecl>(VD) && VD->getType()->isReferenceType() &&
2412 VD->isUsableInConstantExpressions(getContext()) &&
2413 VD->checkInitIsICE() &&
2414 // Do not emit if it is private OpenMP variable.
2415 !(E->refersToEnclosingVariableOrCapture() &&
2416 ((CapturedStmtInfo &&
2417 (LocalDeclMap.count(VD->getCanonicalDecl()) ||
2418 CapturedStmtInfo->lookup(VD->getCanonicalDecl()))) ||
2419 LambdaCaptureFields.lookup(VD->getCanonicalDecl()) ||
2420 isa<BlockDecl>(CurCodeDecl)))) {
2421 llvm::Constant *Val =
2422 ConstantEmitter(*this).emitAbstract(E->getLocation(),
2423 *VD->evaluateValue(),
2424 VD->getType());
2425 assert(Val && "failed to emit reference constant expression")(static_cast <bool> (Val && "failed to emit reference constant expression"
) ? void (0) : __assert_fail ("Val && \"failed to emit reference constant expression\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2425, __extension__ __PRETTY_FUNCTION__))
;
2426 // FIXME: Eventually we will want to emit vector element references.
2427
2428 // Should we be using the alignment of the constant pointer we emitted?
2429 CharUnits Alignment = getNaturalTypeAlignment(E->getType(),
2430 /* BaseInfo= */ nullptr,
2431 /* TBAAInfo= */ nullptr,
2432 /* forPointeeType= */ true);
2433 return MakeAddrLValue(Address(Val, Alignment), T, AlignmentSource::Decl);
2434 }
2435
2436 // Check for captured variables.
2437 if (E->refersToEnclosingVariableOrCapture()) {
2438 VD = VD->getCanonicalDecl();
2439 if (auto *FD = LambdaCaptureFields.lookup(VD))
2440 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
2441 else if (CapturedStmtInfo) {
2442 auto I = LocalDeclMap.find(VD);
2443 if (I != LocalDeclMap.end()) {
2444 if (VD->getType()->isReferenceType())
2445 return EmitLoadOfReferenceLValue(I->second, VD->getType(),
2446 AlignmentSource::Decl);
2447 return MakeAddrLValue(I->second, T);
2448 }
2449 LValue CapLVal =
2450 EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
2451 CapturedStmtInfo->getContextValue());
2452 return MakeAddrLValue(
2453 Address(CapLVal.getPointer(), getContext().getDeclAlign(VD)),
2454 CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
2455 CapLVal.getTBAAInfo());
2456 }
2457
2458 assert(isa<BlockDecl>(CurCodeDecl))(static_cast <bool> (isa<BlockDecl>(CurCodeDecl))
? void (0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2458, __extension__ __PRETTY_FUNCTION__))
;
2459 Address addr = GetAddrOfBlockDecl(VD, VD->hasAttr<BlocksAttr>());
2460 return MakeAddrLValue(addr, T, AlignmentSource::Decl);
2461 }
2462 }
2463
2464 // FIXME: We should be able to assert this for FunctionDecls as well!
2465 // FIXME: We should be able to assert this for all DeclRefExprs, not just
2466 // those with a valid source location.
2467 assert((ND->isUsed(false) || !isa<VarDecl>(ND) ||(static_cast <bool> ((ND->isUsed(false) || !isa<VarDecl
>(ND) || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? void (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2469, __extension__ __PRETTY_FUNCTION__))
2468 !E->getLocation().isValid()) &&(static_cast <bool> ((ND->isUsed(false) || !isa<VarDecl
>(ND) || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? void (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2469, __extension__ __PRETTY_FUNCTION__))
2469 "Should not use decl without marking it used!")(static_cast <bool> ((ND->isUsed(false) || !isa<VarDecl
>(ND) || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? void (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2469, __extension__ __PRETTY_FUNCTION__))
;
2470
2471 if (ND->hasAttr<WeakRefAttr>()) {
2472 const auto *VD = cast<ValueDecl>(ND);
2473 ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
2474 return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
2475 }
2476
2477 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2478 // Check if this is a global variable.
2479 if (VD->hasLinkage() || VD->isStaticDataMember())
2480 return EmitGlobalVarDeclLValue(*this, E, VD);
2481
2482 Address addr = Address::invalid();
2483
2484 // The variable should generally be present in the local decl map.
2485 auto iter = LocalDeclMap.find(VD);
2486 if (iter != LocalDeclMap.end()) {
2487 addr = iter->second;
2488
2489 // Otherwise, it might be static local we haven't emitted yet for
2490 // some reason; most likely, because it's in an outer function.
2491 } else if (VD->isStaticLocal()) {
2492 addr = Address(CGM.getOrCreateStaticVarDecl(
2493 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*isConstant=*/false)),
2494 getContext().getDeclAlign(VD));
2495
2496 // No other cases for now.
2497 } else {
2498 llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?")::llvm::llvm_unreachable_internal("DeclRefExpr for Decl not entered in LocalDeclMap?"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2498)
;
2499 }
2500
2501
2502 // Check for OpenMP threadprivate variables.
2503 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
2504 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2505 return EmitThreadPrivateVarDeclLValue(
2506 *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
2507 E->getExprLoc());
2508 }
2509
2510 // Drill into block byref variables.
2511 bool isBlockByref = VD->hasAttr<BlocksAttr>();
2512 if (isBlockByref) {
2513 addr = emitBlockByrefAddress(addr, VD);
2514 }
2515
2516 // Drill into reference types.
2517 LValue LV = VD->getType()->isReferenceType() ?
2518 EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
2519 MakeAddrLValue(addr, T, AlignmentSource::Decl);
2520
2521 bool isLocalStorage = VD->hasLocalStorage();
2522
2523 bool NonGCable = isLocalStorage &&
2524 !VD->getType()->isReferenceType() &&
2525 !isBlockByref;
2526 if (NonGCable) {
2527 LV.getQuals().removeObjCGCAttr();
2528 LV.setNonGC(true);
2529 }
2530
2531 bool isImpreciseLifetime =
2532 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2533 if (isImpreciseLifetime)
2534 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2535 setObjCGCLValueClass(getContext(), E, LV);
2536 return LV;
2537 }
2538
2539 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2540 return EmitFunctionDeclLValue(*this, E, FD);
2541
2542 // FIXME: While we're emitting a binding from an enclosing scope, all other
2543 // DeclRefExprs we see should be implicitly treated as if they also refer to
2544 // an enclosing scope.
2545 if (const auto *BD = dyn_cast<BindingDecl>(ND))
2546 return EmitLValue(BD->getBinding());
2547
2548 llvm_unreachable("Unhandled DeclRefExpr")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2548)
;
2549}
2550
2551LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2552 // __extension__ doesn't affect lvalue-ness.
2553 if (E->getOpcode() == UO_Extension)
2554 return EmitLValue(E->getSubExpr());
2555
2556 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2557 switch (E->getOpcode()) {
2558 default: llvm_unreachable("Unknown unary operator lvalue!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2558)
;
2559 case UO_Deref: {
2560 QualType T = E->getSubExpr()->getType()->getPointeeType();
2561 assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type")(static_cast <bool> (!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type"
) ? void (0) : __assert_fail ("!T.isNull() && \"CodeGenFunction::EmitUnaryOpLValue: Illegal type\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2561, __extension__ __PRETTY_FUNCTION__))
;
2562
2563 LValueBaseInfo BaseInfo;
2564 TBAAAccessInfo TBAAInfo;
2565 Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
2566 &TBAAInfo);
2567 LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
2568 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2569
2570 // We should not generate __weak write barrier on indirect reference
2571 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2572 // But, we continue to generate __strong write barrier on indirect write
2573 // into a pointer to object.
2574 if (getLangOpts().ObjC1 &&
2575 getLangOpts().getGC() != LangOptions::NonGC &&
2576 LV.isObjCWeak())
2577 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2578 return LV;
2579 }
2580 case UO_Real:
2581 case UO_Imag: {
2582 LValue LV = EmitLValue(E->getSubExpr());
2583 assert(LV.isSimple() && "real/imag on non-ordinary l-value")(static_cast <bool> (LV.isSimple() && "real/imag on non-ordinary l-value"
) ? void (0) : __assert_fail ("LV.isSimple() && \"real/imag on non-ordinary l-value\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2583, __extension__ __PRETTY_FUNCTION__))
;
2584
2585 // __real is valid on scalars. This is a faster way of testing that.
2586 // __imag can only produce an rvalue on scalars.
2587 if (E->getOpcode() == UO_Real &&
2588 !LV.getAddress().getElementType()->isStructTy()) {
2589 assert(E->getSubExpr()->getType()->isArithmeticType())(static_cast <bool> (E->getSubExpr()->getType()->
isArithmeticType()) ? void (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2589, __extension__ __PRETTY_FUNCTION__))
;
2590 return LV;
2591 }
2592
2593 QualType T = ExprTy->castAs<ComplexType>()->getElementType();
2594
2595 Address Component =
2596 (E->getOpcode() == UO_Real
2597 ? emitAddrOfRealComponent(LV.getAddress(), LV.getType())
2598 : emitAddrOfImagComponent(LV.getAddress(), LV.getType()));
2599 LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
2600 CGM.getTBAAInfoForSubobject(LV, T));
2601 ElemLV.getQuals().addQualifiers(LV.getQuals());
2602 return ElemLV;
2603 }
2604 case UO_PreInc:
2605 case UO_PreDec: {
2606 LValue LV = EmitLValue(E->getSubExpr());
2607 bool isInc = E->getOpcode() == UO_PreInc;
2608
2609 if (E->getType()->isAnyComplexType())
2610 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2611 else
2612 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2613 return LV;
2614 }
2615 }
2616}
2617
2618LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2619 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2620 E->getType(), AlignmentSource::Decl);
2621}
2622
2623LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2624 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2625 E->getType(), AlignmentSource::Decl);
2626}
2627
2628LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2629 auto SL = E->getFunctionName();
2630 assert(SL != nullptr && "No StringLiteral name in PredefinedExpr")(static_cast <bool> (SL != nullptr && "No StringLiteral name in PredefinedExpr"
) ? void (0) : __assert_fail ("SL != nullptr && \"No StringLiteral name in PredefinedExpr\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2630, __extension__ __PRETTY_FUNCTION__))
;
2631 StringRef FnName = CurFn->getName();
2632 if (FnName.startswith("\01"))
2633 FnName = FnName.substr(1);
2634 StringRef NameItems[] = {
2635 PredefinedExpr::getIdentTypeName(E->getIdentType()), FnName};
2636 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2637 if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
2638 std::string Name = SL->getString();
2639 if (!Name.empty()) {
2640 unsigned Discriminator =
2641 CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
2642 if (Discriminator)
2643 Name += "_" + Twine(Discriminator + 1).str();
2644 auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
2645 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2646 } else {
2647 auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str());
2648 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2649 }
2650 }
2651 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2652 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2653}
2654
2655/// Emit a type description suitable for use by a runtime sanitizer library. The
2656/// format of a type descriptor is
2657///
2658/// \code
2659/// { i16 TypeKind, i16 TypeInfo }
2660/// \endcode
2661///
2662/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2663/// integer, 1 for a floating point value, and -1 for anything else.
2664llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2665 // Only emit each type's descriptor once.
2666 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2667 return C;
2668
2669 uint16_t TypeKind = -1;
2670 uint16_t TypeInfo = 0;
2671
2672 if (T->isIntegerType()) {
2673 TypeKind = 0;
2674 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2675 (T->isSignedIntegerType() ? 1 : 0);
2676 } else if (T->isFloatingType()) {
2677 TypeKind = 1;
2678 TypeInfo = getContext().getTypeSize(T);
2679 }
2680
2681 // Format the type name as if for a diagnostic, including quotes and
2682 // optionally an 'aka'.
2683 SmallString<32> Buffer;
2684 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2685 (intptr_t)T.getAsOpaquePtr(),
2686 StringRef(), StringRef(), None, Buffer,
2687 None);
2688
2689 llvm::Constant *Components[] = {
2690 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2691 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2692 };
2693 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2694
2695 auto *GV = new llvm::GlobalVariable(
2696 CGM.getModule(), Descriptor->getType(),
2697 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2698 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2699 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2700
2701 // Remember the descriptor for this type.
2702 CGM.setTypeDescriptorInMap(T, GV);
2703
2704 return GV;
2705}
2706
2707llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2708 llvm::Type *TargetTy = IntPtrTy;
2709
2710 if (V->getType() == TargetTy)
2711 return V;
2712
2713 // Floating-point types which fit into intptr_t are bitcast to integers
2714 // and then passed directly (after zero-extension, if necessary).
2715 if (V->getType()->isFloatingPointTy()) {
2716 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2717 if (Bits <= TargetTy->getIntegerBitWidth())
2718 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2719 Bits));
2720 }
2721
2722 // Integers which fit in intptr_t are zero-extended and passed directly.
2723 if (V->getType()->isIntegerTy() &&
2724 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2725 return Builder.CreateZExt(V, TargetTy);
2726
2727 // Pointers are passed directly, everything else is passed by address.
2728 if (!V->getType()->isPointerTy()) {
2729 Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
2730 Builder.CreateStore(V, Ptr);
2731 V = Ptr.getPointer();
2732 }
2733 return Builder.CreatePtrToInt(V, TargetTy);
2734}
2735
2736/// Emit a representation of a SourceLocation for passing to a handler
2737/// in a sanitizer runtime library. The format for this data is:
2738/// \code
2739/// struct SourceLocation {
2740/// const char *Filename;
2741/// int32_t Line, Column;
2742/// };
2743/// \endcode
2744/// For an invalid SourceLocation, the Filename pointer is null.
2745llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
2746 llvm::Constant *Filename;
2747 int Line, Column;
2748
2749 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
2750 if (PLoc.isValid()) {
2751 StringRef FilenameString = PLoc.getFilename();
2752
2753 int PathComponentsToStrip =
2754 CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
2755 if (PathComponentsToStrip < 0) {
2756 assert(PathComponentsToStrip != INT_MIN)(static_cast <bool> (PathComponentsToStrip != (-2147483647
-1)) ? void (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2756, __extension__ __PRETTY_FUNCTION__))
;
2757 int PathComponentsToKeep = -PathComponentsToStrip;
2758 auto I = llvm::sys::path::rbegin(FilenameString);
2759 auto E = llvm::sys::path::rend(FilenameString);
2760 while (I != E && --PathComponentsToKeep)
2761 ++I;
2762
2763 FilenameString = FilenameString.substr(I - E);
2764 } else if (PathComponentsToStrip > 0) {
2765 auto I = llvm::sys::path::begin(FilenameString);
2766 auto E = llvm::sys::path::end(FilenameString);
2767 while (I != E && PathComponentsToStrip--)
2768 ++I;
2769
2770 if (I != E)
2771 FilenameString =
2772 FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
2773 else
2774 FilenameString = llvm::sys::path::filename(FilenameString);
2775 }
2776
2777 auto FilenameGV = CGM.GetAddrOfConstantCString(FilenameString, ".src");
2778 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
2779 cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
2780 Filename = FilenameGV.getPointer();
2781 Line = PLoc.getLine();
2782 Column = PLoc.getColumn();
2783 } else {
2784 Filename = llvm::Constant::getNullValue(Int8PtrTy);
2785 Line = Column = 0;
2786 }
2787
2788 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
2789 Builder.getInt32(Column)};
2790
2791 return llvm::ConstantStruct::getAnon(Data);
2792}
2793
2794namespace {
2795/// Specify under what conditions this check can be recovered
2796enum class CheckRecoverableKind {
2797 /// Always terminate program execution if this check fails.
2798 Unrecoverable,
2799 /// Check supports recovering, runtime has both fatal (noreturn) and
2800 /// non-fatal handlers for this check.
2801 Recoverable,
2802 /// Runtime conditionally aborts, always need to support recovery.
2803 AlwaysRecoverable
2804};
2805}
2806
2807static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
2808 assert(llvm::countPopulation(Kind) == 1)(static_cast <bool> (llvm::countPopulation(Kind) == 1) ?
void (0) : __assert_fail ("llvm::countPopulation(Kind) == 1"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2808, __extension__ __PRETTY_FUNCTION__))
;
2809 switch (Kind) {
2810 case SanitizerKind::Vptr:
2811 return CheckRecoverableKind::AlwaysRecoverable;
2812 case SanitizerKind::Return:
2813 case SanitizerKind::Unreachable:
2814 return CheckRecoverableKind::Unrecoverable;
2815 default:
2816 return CheckRecoverableKind::Recoverable;
2817 }
2818}
2819
2820namespace {
2821struct SanitizerHandlerInfo {
2822 char const *const Name;
2823 unsigned Version;
2824};
2825}
2826
2827const SanitizerHandlerInfo SanitizerHandlers[] = {
2828#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
2829 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
, 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(VLABoundNotPositive
, vla_bound_not_positive, 0)
2830#undef SANITIZER_CHECK
2831};
2832
2833static void emitCheckHandlerCall(CodeGenFunction &CGF,
2834 llvm::FunctionType *FnType,
2835 ArrayRef<llvm::Value *> FnArgs,
2836 SanitizerHandler CheckHandler,
2837 CheckRecoverableKind RecoverKind, bool IsFatal,
2838 llvm::BasicBlock *ContBB) {
2839 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable)(static_cast <bool> (IsFatal || RecoverKind != CheckRecoverableKind
::Unrecoverable) ? void (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2839, __extension__ __PRETTY_FUNCTION__))
;
2840 bool NeedsAbortSuffix =
2841 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
2842 bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
2843 const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
2844 const StringRef CheckName = CheckInfo.Name;
2845 std::string FnName = "__ubsan_handle_" + CheckName.str();
2846 if (CheckInfo.Version && !MinimalRuntime)
2847 FnName += "_v" + llvm::utostr(CheckInfo.Version);
2848 if (MinimalRuntime)
2849 FnName += "_minimal";
2850 if (NeedsAbortSuffix)
2851 FnName += "_abort";
2852 bool MayReturn =
2853 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
2854
2855 llvm::AttrBuilder B;
2856 if (!MayReturn) {
2857 B.addAttribute(llvm::Attribute::NoReturn)
2858 .addAttribute(llvm::Attribute::NoUnwind);
2859 }
2860 B.addAttribute(llvm::Attribute::UWTable);
2861
2862 llvm::Value *Fn = CGF.CGM.CreateRuntimeFunction(
2863 FnType, FnName,
2864 llvm::AttributeList::get(CGF.getLLVMContext(),
2865 llvm::AttributeList::FunctionIndex, B),
2866 /*Local=*/true);
2867 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
2868 if (!MayReturn) {
2869 HandlerCall->setDoesNotReturn();
2870 CGF.Builder.CreateUnreachable();
2871 } else {
2872 CGF.Builder.CreateBr(ContBB);
2873 }
2874}
2875
2876void CodeGenFunction::EmitCheck(
2877 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
2878 SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
2879 ArrayRef<llvm::Value *> DynamicArgs) {
2880 assert(IsSanitizerScope)(static_cast <bool> (IsSanitizerScope) ? void (0) : __assert_fail
("IsSanitizerScope", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2880, __extension__ __PRETTY_FUNCTION__))
;
2881 assert(Checked.size() > 0)(static_cast <bool> (Checked.size() > 0) ? void (0) :
__assert_fail ("Checked.size() > 0", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2881, __extension__ __PRETTY_FUNCTION__))
;
2882 assert(CheckHandler >= 0 &&(static_cast <bool> (CheckHandler >= 0 && size_t
(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)) ?
void (0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2883, __extension__ __PRETTY_FUNCTION__))
2883 size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers))(static_cast <bool> (CheckHandler >= 0 && size_t
(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)) ?
void (0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2883, __extension__ __PRETTY_FUNCTION__))
;
2884 const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
2885
2886 llvm::Value *FatalCond = nullptr;
2887 llvm::Value *RecoverableCond = nullptr;
2888 llvm::Value *TrapCond = nullptr;
2889 for (int i = 0, n = Checked.size(); i < n; ++i) {
2890 llvm::Value *Check = Checked[i].first;
2891 // -fsanitize-trap= overrides -fsanitize-recover=.
2892 llvm::Value *&Cond =
2893 CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
2894 ? TrapCond
2895 : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
2896 ? RecoverableCond
2897 : FatalCond;
2898 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
2899 }
2900
2901 if (TrapCond)
2902 EmitTrapCheck(TrapCond);
2903 if (!FatalCond && !RecoverableCond)
2904 return;
2905
2906 llvm::Value *JointCond;
2907 if (FatalCond && RecoverableCond)
2908 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
2909 else
2910 JointCond = FatalCond ? FatalCond : RecoverableCond;
2911 assert(JointCond)(static_cast <bool> (JointCond) ? void (0) : __assert_fail
("JointCond", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2911, __extension__ __PRETTY_FUNCTION__))
;
2912
2913 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
2914 assert(SanOpts.has(Checked[0].second))(static_cast <bool> (SanOpts.has(Checked[0].second)) ? void
(0) : __assert_fail ("SanOpts.has(Checked[0].second)", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2914, __extension__ __PRETTY_FUNCTION__))
;
2915#ifndef NDEBUG
2916 for (int i = 1, n = Checked.size(); i < n; ++i) {
2917 assert(RecoverKind == getRecoverableKind(Checked[i].second) &&(static_cast <bool> (RecoverKind == getRecoverableKind(
Checked[i].second) && "All recoverable kinds in a single check must be same!"
) ? void (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2918, __extension__ __PRETTY_FUNCTION__))
2918 "All recoverable kinds in a single check must be same!")(static_cast <bool> (RecoverKind == getRecoverableKind(
Checked[i].second) && "All recoverable kinds in a single check must be same!"
) ? void (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2918, __extension__ __PRETTY_FUNCTION__))
;
2919 assert(SanOpts.has(Checked[i].second))(static_cast <bool> (SanOpts.has(Checked[i].second)) ? void
(0) : __assert_fail ("SanOpts.has(Checked[i].second)", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2919, __extension__ __PRETTY_FUNCTION__))
;
2920 }
2921#endif
2922
2923 llvm::BasicBlock *Cont = createBasicBlock("cont");
2924 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
2925 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
2926 // Give hint that we very much don't expect to execute the handler
2927 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
2928 llvm::MDBuilder MDHelper(getLLVMContext());
2929 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
2930 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
2931 EmitBlock(Handlers);
2932
2933 // Handler functions take an i8* pointing to the (handler-specific) static
2934 // information block, followed by a sequence of intptr_t arguments
2935 // representing operand values.
2936 SmallVector<llvm::Value *, 4> Args;
2937 SmallVector<llvm::Type *, 4> ArgTypes;
2938 if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
2939 Args.reserve(DynamicArgs.size() + 1);
2940 ArgTypes.reserve(DynamicArgs.size() + 1);
2941
2942 // Emit handler arguments and create handler function type.
2943 if (!StaticArgs.empty()) {
2944 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
2945 auto *InfoPtr =
2946 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
2947 llvm::GlobalVariable::PrivateLinkage, Info);
2948 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2949 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
2950 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
2951 ArgTypes.push_back(Int8PtrTy);
2952 }
2953
2954 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
2955 Args.push_back(EmitCheckValue(DynamicArgs[i]));
2956 ArgTypes.push_back(IntPtrTy);
2957 }
2958 }
2959
2960 llvm::FunctionType *FnType =
2961 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
2962
2963 if (!FatalCond || !RecoverableCond) {
2964 // Simple case: we need to generate a single handler call, either
2965 // fatal, or non-fatal.
2966 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
2967 (FatalCond != nullptr), Cont);
2968 } else {
2969 // Emit two handler calls: first one for set of unrecoverable checks,
2970 // another one for recoverable.
2971 llvm::BasicBlock *NonFatalHandlerBB =
2972 createBasicBlock("non_fatal." + CheckName);
2973 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
2974 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
2975 EmitBlock(FatalHandlerBB);
2976 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
2977 NonFatalHandlerBB);
2978 EmitBlock(NonFatalHandlerBB);
2979 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
2980 Cont);
2981 }
2982
2983 EmitBlock(Cont);
2984}
2985
2986void CodeGenFunction::EmitCfiSlowPathCheck(
2987 SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
2988 llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
2989 llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
2990
2991 llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
2992 llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
2993
2994 llvm::MDBuilder MDHelper(getLLVMContext());
2995 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
2996 BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
2997
2998 EmitBlock(CheckBB);
2999
3000 bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
3001
3002 llvm::CallInst *CheckCall;
3003 llvm::Constant *SlowPathFn;
3004 if (WithDiag) {
3005 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3006 auto *InfoPtr =
3007 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3008 llvm::GlobalVariable::PrivateLinkage, Info);
3009 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3010 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3011
3012 SlowPathFn = CGM.getModule().getOrInsertFunction(
3013 "__cfi_slowpath_diag",
3014 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
3015 false));
3016 CheckCall = Builder.CreateCall(
3017 SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
3018 } else {
3019 SlowPathFn = CGM.getModule().getOrInsertFunction(
3020 "__cfi_slowpath",
3021 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
3022 CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
3023 }
3024
3025 CGM.setDSOLocal(cast<llvm::GlobalValue>(SlowPathFn->stripPointerCasts()));
3026 CheckCall->setDoesNotThrow();
3027
3028 EmitBlock(Cont);
3029}
3030
3031// Emit a stub for __cfi_check function so that the linker knows about this
3032// symbol in LTO mode.
3033void CodeGenFunction::EmitCfiCheckStub() {
3034 llvm::Module *M = &CGM.getModule();
3035 auto &Ctx = M->getContext();
3036 llvm::Function *F = llvm::Function::Create(
3037 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
3038 llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
3039 CGM.setDSOLocal(F);
3040 llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
3041 // FIXME: consider emitting an intrinsic call like
3042 // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
3043 // which can be lowered in CrossDSOCFI pass to the actual contents of
3044 // __cfi_check. This would allow inlining of __cfi_check calls.
3045 llvm::CallInst::Create(
3046 llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
3047 llvm::ReturnInst::Create(Ctx, nullptr, BB);
3048}
3049
3050// This function is basically a switch over the CFI failure kind, which is
3051// extracted from CFICheckFailData (1st function argument). Each case is either
3052// llvm.trap or a call to one of the two runtime handlers, based on
3053// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
3054// failure kind) traps, but this should really never happen. CFICheckFailData
3055// can be nullptr if the calling module has -fsanitize-trap behavior for this
3056// check kind; in this case __cfi_check_fail traps as well.
3057void CodeGenFunction::EmitCfiCheckFail() {
3058 SanitizerScope SanScope(this);
3059 FunctionArgList Args;
3060 ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
3061 ImplicitParamDecl::Other);
3062 ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
3063 ImplicitParamDecl::Other);
3064 Args.push_back(&ArgData);
3065 Args.push_back(&ArgAddr);
3066
3067 const CGFunctionInfo &FI =
3068 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
3069
3070 llvm::Function *F = llvm::Function::Create(
3071 llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
3072 llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
3073 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
3074
3075 StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
3076 SourceLocation());
3077
3078 // This function should not be affected by blacklist. This function does
3079 // not have a source location, but "src:*" would still apply. Revert any
3080 // changes to SanOpts made in StartFunction.
3081 SanOpts = CGM.getLangOpts().Sanitize;
3082
3083 llvm::Value *Data =
3084 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
3085 CGM.getContext().VoidPtrTy, ArgData.getLocation());
3086 llvm::Value *Addr =
3087 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
3088 CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
3089
3090 // Data == nullptr means the calling module has trap behaviour for this check.
3091 llvm::Value *DataIsNotNullPtr =
3092 Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
3093 EmitTrapCheck(DataIsNotNullPtr);
3094
3095 llvm::StructType *SourceLocationTy =
3096 llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
3097 llvm::StructType *CfiCheckFailDataTy =
3098 llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
3099
3100 llvm::Value *V = Builder.CreateConstGEP2_32(
3101 CfiCheckFailDataTy,
3102 Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
3103 0);
3104 Address CheckKindAddr(V, getIntAlign());
3105 llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
3106
3107 llvm::Value *AllVtables = llvm::MetadataAsValue::get(
3108 CGM.getLLVMContext(),
3109 llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
3110 llvm::Value *ValidVtable = Builder.CreateZExt(
3111 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
3112 {Addr, AllVtables}),
3113 IntPtrTy);
3114
3115 const std::pair<int, SanitizerMask> CheckKinds[] = {
3116 {CFITCK_VCall, SanitizerKind::CFIVCall},
3117 {CFITCK_NVCall, SanitizerKind::CFINVCall},
3118 {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
3119 {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
3120 {CFITCK_ICall, SanitizerKind::CFIICall}};
3121
3122 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
3123 for (auto CheckKindMaskPair : CheckKinds) {
3124 int Kind = CheckKindMaskPair.first;
3125 SanitizerMask Mask = CheckKindMaskPair.second;
3126 llvm::Value *Cond =
3127 Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
3128 if (CGM.getLangOpts().Sanitize.has(Mask))
3129 EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
3130 {Data, Addr, ValidVtable});
3131 else
3132 EmitTrapCheck(Cond);
3133 }
3134
3135 FinishFunction();
3136 // The only reference to this function will be created during LTO link.
3137 // Make sure it survives until then.
3138 CGM.addUsedGlobal(F);
3139}
3140
3141void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
3142 if (SanOpts.has(SanitizerKind::Unreachable)) {
3143 SanitizerScope SanScope(this);
3144 EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
3145 SanitizerKind::Unreachable),
3146 SanitizerHandler::BuiltinUnreachable,
3147 EmitCheckSourceLocation(Loc), None);
3148 }
3149 Builder.CreateUnreachable();
3150}
3151
3152void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
3153 llvm::BasicBlock *Cont = createBasicBlock("cont");
3154
3155 // If we're optimizing, collapse all calls to trap down to just one per
3156 // function to save on code size.
3157 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
3158 TrapBB = createBasicBlock("trap");
3159 Builder.CreateCondBr(Checked, Cont, TrapBB);
3160 EmitBlock(TrapBB);
3161 llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
3162 TrapCall->setDoesNotReturn();
3163 TrapCall->setDoesNotThrow();
3164 Builder.CreateUnreachable();
3165 } else {
3166 Builder.CreateCondBr(Checked, Cont, TrapBB);
3167 }
3168
3169 EmitBlock(Cont);
3170}
3171
3172llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
3173 llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
3174
3175 if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
3176 auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
3177 CGM.getCodeGenOpts().TrapFuncName);
3178 TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
3179 }
3180
3181 return TrapCall;
3182}
3183
3184Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
3185 LValueBaseInfo *BaseInfo,
3186 TBAAAccessInfo *TBAAInfo) {
3187 assert(E->getType()->isArrayType() &&(static_cast <bool> (E->getType()->isArrayType() &&
"Array to pointer decay must have array source type!") ? void
(0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3188, __extension__ __PRETTY_FUNCTION__))
3188 "Array to pointer decay must have array source type!")(static_cast <bool> (E->getType()->isArrayType() &&
"Array to pointer decay must have array source type!") ? void
(0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3188, __extension__ __PRETTY_FUNCTION__))
;
3189
3190 // Expressions of array type can't be bitfields or vector elements.
3191 LValue LV = EmitLValue(E);
3192 Address Addr = LV.getAddress();
3193
3194 // If the array type was an incomplete type, we need to make sure
3195 // the decay ends up being the right type.
3196 llvm::Type *NewTy = ConvertType(E->getType());
3197 Addr = Builder.CreateElementBitCast(Addr, NewTy);
3198
3199 // Note that VLA pointers are always decayed, so we don't need to do
3200 // anything here.
3201 if (!E->getType()->isVariableArrayType()) {
3202 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&(static_cast <bool> (isa<llvm::ArrayType>(Addr.getElementType
()) && "Expected pointer to array") ? void (0) : __assert_fail
("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3203, __extension__ __PRETTY_FUNCTION__))
3203 "Expected pointer to array")(static_cast <bool> (isa<llvm::ArrayType>(Addr.getElementType
()) && "Expected pointer to array") ? void (0) : __assert_fail
("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3203, __extension__ __PRETTY_FUNCTION__))
;
3204 Addr = Builder.CreateStructGEP(Addr, 0, CharUnits::Zero(), "arraydecay");
3205 }
3206
3207 // The result of this decay conversion points to an array element within the
3208 // base lvalue. However, since TBAA currently does not support representing
3209 // accesses to elements of member arrays, we conservatively represent accesses
3210 // to the pointee object as if it had no any base lvalue specified.
3211 // TODO: Support TBAA for member arrays.
3212 QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
3213 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
3214 if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
3215
3216 return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
3217}
3218
3219/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3220/// array to pointer, return the array subexpression.
3221static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
3222 // If this isn't just an array->pointer decay, bail out.
3223 const auto *CE = dyn_cast<CastExpr>(E);
3224 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
3225 return nullptr;
3226
3227 // If this is a decay from variable width array, bail out.
3228 const Expr *SubExpr = CE->getSubExpr();
3229 if (SubExpr->getType()->isVariableArrayType())
3230 return nullptr;
3231
3232 return SubExpr;
3233}
3234
3235static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
3236 llvm::Value *ptr,
3237 ArrayRef<llvm::Value*> indices,
3238 bool inbounds,
3239 bool signedIndices,
3240 SourceLocation loc,
3241 const llvm::Twine &name = "arrayidx") {
3242 if (inbounds) {
3243 return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
3244 CodeGenFunction::NotSubtraction, loc,
3245 name);
3246 } else {
3247 return CGF.Builder.CreateGEP(ptr, indices, name);
3248 }
3249}
3250
3251static CharUnits getArrayElementAlign(CharUnits arrayAlign,
3252 llvm::Value *idx,
3253 CharUnits eltSize) {
3254 // If we have a constant index, we can use the exact offset of the
3255 // element we're accessing.
3256 if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
3257 CharUnits offset = constantIdx->getZExtValue() * eltSize;
3258 return arrayAlign.alignmentAtOffset(offset);
3259
3260 // Otherwise, use the worst-case alignment for any element.
3261 } else {
3262 return arrayAlign.alignmentOfArrayElement(eltSize);
3263 }
3264}
3265
3266static QualType getFixedSizeElementType(const ASTContext &ctx,
3267 const VariableArrayType *vla) {
3268 QualType eltType;
3269 do {
3270 eltType = vla->getElementType();
3271 } while ((vla = ctx.getAsVariableArrayType(eltType)));
3272 return eltType;
3273}
3274
3275static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
3276 ArrayRef<llvm::Value *> indices,
3277 QualType eltType, bool inbounds,
3278 bool signedIndices, SourceLocation loc,
3279 const llvm::Twine &name = "arrayidx") {
3280 // All the indices except that last must be zero.
3281#ifndef NDEBUG
3282 for (auto idx : indices.drop_back())
3283 assert(isa<llvm::ConstantInt>(idx) &&(static_cast <bool> (isa<llvm::ConstantInt>(idx) &&
cast<llvm::ConstantInt>(idx)->isZero()) ? void (0) :
__assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3284, __extension__ __PRETTY_FUNCTION__))
3284 cast<llvm::ConstantInt>(idx)->isZero())(static_cast <bool> (isa<llvm::ConstantInt>(idx) &&
cast<llvm::ConstantInt>(idx)->isZero()) ? void (0) :
__assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3284, __extension__ __PRETTY_FUNCTION__))
;
3285#endif
3286
3287 // Determine the element size of the statically-sized base. This is
3288 // the thing that the indices are expressed in terms of.
3289 if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
3290 eltType = getFixedSizeElementType(CGF.getContext(), vla);
3291 }
3292
3293 // We can use that to compute the best alignment of the element.
3294 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
3295 CharUnits eltAlign =
3296 getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
3297
3298 llvm::Value *eltPtr = emitArraySubscriptGEP(
3299 CGF, addr.getPointer(), indices, inbounds, signedIndices, loc, name);
3300 return Address(eltPtr, eltAlign);
3301}
3302
3303LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3304 bool Accessed) {
3305 // The index must always be an integer, which is not an aggregate. Emit it
3306 // in lexical order (this complexity is, sadly, required by C++17).
3307 llvm::Value *IdxPre =
3308 (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
14
Assuming the condition is false
15
'?' condition is false
3309 bool SignedIndices = false;
3310 auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
16
Null pointer value stored to 'EmitIdxAfterBase.'
3311 auto *Idx = IdxPre;
20
'Idx' initialized to a null pointer value
3312 if (E->getLHS() != E->getIdx()) {
21
Assuming the condition is false
22
Taking false branch
3313 assert(E->getRHS() == E->getIdx() && "index was neither LHS nor RHS")(static_cast <bool> (E->getRHS() == E->getIdx() &&
"index was neither LHS nor RHS") ? void (0) : __assert_fail (
"E->getRHS() == E->getIdx() && \"index was neither LHS nor RHS\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3313, __extension__ __PRETTY_FUNCTION__))
;
3314 Idx = EmitScalarExpr(E->getIdx());
3315 }
3316
3317 QualType IdxTy = E->getIdx()->getType();
3318 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
3319 SignedIndices |= IdxSigned;
3320
3321 if (SanOpts.has(SanitizerKind::ArrayBounds))
23
Assuming the condition is false
24
Taking false branch
3322 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
3323
3324 // Extend or truncate the index type to 32 or 64-bits.
3325 if (Promote && Idx->getType() != IntPtrTy)
25
Called C++ object pointer is null
3326 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
3327
3328 return Idx;
3329 };
3330 IdxPre = nullptr;
3331
3332 // If the base is a vector type, then we are forming a vector element lvalue
3333 // with this subscript.
3334 if (E->getBase()->getType()->isVectorType() &&
17
Taking false branch
3335 !isa<ExtVectorElementExpr>(E->getBase())) {
3336 // Emit the vector as an lvalue to get its address.
3337 LValue LHS = EmitLValue(E->getBase());
3338 auto *Idx = EmitIdxAfterBase(/*Promote*/false);
3339 assert(LHS.isSimple() && "Can only subscript lvalue vectors here!")(static_cast <bool> (LHS.isSimple() && "Can only subscript lvalue vectors here!"
) ? void (0) : __assert_fail ("LHS.isSimple() && \"Can only subscript lvalue vectors here!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3339, __extension__ __PRETTY_FUNCTION__))
;
3340 return LValue::MakeVectorElt(LHS.getAddress(), Idx, E->getBase()->getType(),
3341 LHS.getBaseInfo(), TBAAAccessInfo());
3342 }
3343
3344 // All the other cases basically behave like simple offsetting.
3345
3346 // Handle the extvector case we ignored above.
3347 if (isa<ExtVectorElementExpr>(E->getBase())) {
18
Taking true branch
3348 LValue LV = EmitLValue(E->getBase());
3349 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
19
Calling 'operator()'
3350 Address Addr = EmitExtVectorElementLValue(LV);
3351
3352 QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
3353 Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
3354 SignedIndices, E->getExprLoc());
3355 return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
3356 CGM.getTBAAInfoForSubobject(LV, EltType));
3357 }
3358
3359 LValueBaseInfo EltBaseInfo;
3360 TBAAAccessInfo EltTBAAInfo;
3361 Address Addr = Address::invalid();
3362 if (const VariableArrayType *vla =
3363 getContext().getAsVariableArrayType(E->getType())) {
3364 // The base must be a pointer, which is not an aggregate. Emit
3365 // it. It needs to be emitted first in case it's what captures
3366 // the VLA bounds.
3367 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3368 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3369
3370 // The element count here is the total number of non-VLA elements.
3371 llvm::Value *numElements = getVLASize(vla).NumElts;
3372
3373 // Effectively, the multiply by the VLA size is part of the GEP.
3374 // GEP indexes are signed, and scaling an index isn't permitted to
3375 // signed-overflow, so we use the same semantics for our explicit
3376 // multiply. We suppress this if overflow is not undefined behavior.
3377 if (getLangOpts().isSignedOverflowDefined()) {
3378 Idx = Builder.CreateMul(Idx, numElements);
3379 } else {
3380 Idx = Builder.CreateNSWMul(Idx, numElements);
3381 }
3382
3383 Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
3384 !getLangOpts().isSignedOverflowDefined(),
3385 SignedIndices, E->getExprLoc());
3386
3387 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
3388 // Indexing over an interface, as in "NSString *P; P[4];"
3389
3390 // Emit the base pointer.
3391 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3392 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3393
3394 CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
3395 llvm::Value *InterfaceSizeVal =
3396 llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
3397
3398 llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
3399
3400 // We don't necessarily build correct LLVM struct types for ObjC
3401 // interfaces, so we can't rely on GEP to do this scaling
3402 // correctly, so we need to cast to i8*. FIXME: is this actually
3403 // true? A lot of other things in the fragile ABI would break...
3404 llvm::Type *OrigBaseTy = Addr.getType();
3405 Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
3406
3407 // Do the GEP.
3408 CharUnits EltAlign =
3409 getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
3410 llvm::Value *EltPtr =
3411 emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
3412 SignedIndices, E->getExprLoc());
3413 Addr = Address(EltPtr, EltAlign);
3414
3415 // Cast back.
3416 Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
3417 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3418 // If this is A[i] where A is an array, the frontend will have decayed the
3419 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3420 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3421 // "gep x, i" here. Emit one "gep A, 0, i".
3422 assert(Array->getType()->isArrayType() &&(static_cast <bool> (Array->getType()->isArrayType
() && "Array to pointer decay must have array source type!"
) ? void (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3423, __extension__ __PRETTY_FUNCTION__))
3423 "Array to pointer decay must have array source type!")(static_cast <bool> (Array->getType()->isArrayType
() && "Array to pointer decay must have array source type!"
) ? void (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3423, __extension__ __PRETTY_FUNCTION__))
;
3424 LValue ArrayLV;
3425 // For simple multidimensional array indexing, set the 'accessed' flag for
3426 // better bounds-checking of the base expression.
3427 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3428 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3429 else
3430 ArrayLV = EmitLValue(Array);
3431 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3432
3433 // Propagate the alignment from the array itself to the result.
3434 Addr = emitArraySubscriptGEP(
3435 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3436 E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
3437 E->getExprLoc());
3438 EltBaseInfo = ArrayLV.getBaseInfo();
3439 EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
3440 } else {
3441 // The base must be a pointer; emit it with an estimate of its alignment.
3442 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3443 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3444 Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
3445 !getLangOpts().isSignedOverflowDefined(),
3446 SignedIndices, E->getExprLoc());
3447 }
3448
3449 LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
3450
3451 if (getLangOpts().ObjC1 &&
3452 getLangOpts().getGC() != LangOptions::NonGC) {
3453 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
3454 setObjCGCLValueClass(getContext(), E, LV);
3455 }
3456 return LV;
3457}
3458
3459static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
3460 LValueBaseInfo &BaseInfo,
3461 TBAAAccessInfo &TBAAInfo,
3462 QualType BaseTy, QualType ElTy,
3463 bool IsLowerBound) {
3464 LValue BaseLVal;
3465 if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
1
Assuming 'ASE' is non-null
2
Taking true branch
3466 BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
3
Calling 'CodeGenFunction::EmitOMPArraySectionExpr'
3467 if (BaseTy->isArrayType()) {
3468 Address Addr = BaseLVal.getAddress();
3469 BaseInfo = BaseLVal.getBaseInfo();
3470
3471 // If the array type was an incomplete type, we need to make sure
3472 // the decay ends up being the right type.
3473 llvm::Type *NewTy = CGF.ConvertType(BaseTy);
3474 Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
3475
3476 // Note that VLA pointers are always decayed, so we don't need to do
3477 // anything here.
3478 if (!BaseTy->isVariableArrayType()) {
3479 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&(static_cast <bool> (isa<llvm::ArrayType>(Addr.getElementType
()) && "Expected pointer to array") ? void (0) : __assert_fail
("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3480, __extension__ __PRETTY_FUNCTION__))
3480 "Expected pointer to array")(static_cast <bool> (isa<llvm::ArrayType>(Addr.getElementType
()) && "Expected pointer to array") ? void (0) : __assert_fail
("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3480, __extension__ __PRETTY_FUNCTION__))
;
3481 Addr = CGF.Builder.CreateStructGEP(Addr, 0, CharUnits::Zero(),
3482 "arraydecay");
3483 }
3484
3485 return CGF.Builder.CreateElementBitCast(Addr,
3486 CGF.ConvertTypeForMem(ElTy));
3487 }
3488 LValueBaseInfo TypeBaseInfo;
3489 TBAAAccessInfo TypeTBAAInfo;
3490 CharUnits Align = CGF.getNaturalTypeAlignment(ElTy, &TypeBaseInfo,
3491 &TypeTBAAInfo);
3492 BaseInfo.mergeForCast(TypeBaseInfo);
3493 TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
3494 return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress()), Align);
3495 }
3496 return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3497}
3498
3499LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3500 bool IsLowerBound) {
3501 QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
3502 QualType ResultExprTy;
3503 if (auto *AT = getContext().getAsArrayType(BaseTy))
4
Assuming 'AT' is null
5
Taking false branch
3504 ResultExprTy = AT->getElementType();
3505 else
3506 ResultExprTy = BaseTy->getPointeeType();
3507 llvm::Value *Idx = nullptr;
3508 if (IsLowerBound || E->getColonLoc().isInvalid()) {
6
Assuming 'IsLowerBound' is 0
7
Taking true branch
3509 // Requesting lower bound or upper bound, but without provided length and
3510 // without ':' symbol for the default length -> length = 1.
3511 // Idx = LowerBound ?: 0;
3512 if (auto *LowerBound = E->getLowerBound()) {
8
Taking false branch
3513 Idx = Builder.CreateIntCast(
3514 EmitScalarExpr(LowerBound), IntPtrTy,
3515 LowerBound->getType()->hasSignedIntegerRepresentation());
3516 } else
3517 Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
3518 } else {
3519 // Try to emit length or lower bound as constant. If this is possible, 1
3520 // is subtracted from constant length or lower bound. Otherwise, emit LLVM
3521 // IR (LB + Len) - 1.
3522 auto &C = CGM.getContext();
3523 auto *Length = E->getLength();
3524 llvm::APSInt ConstLength;
3525 if (Length) {
3526 // Idx = LowerBound + Length - 1;
3527 if (Length->isIntegerConstantExpr(ConstLength, C)) {
3528 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3529 Length = nullptr;
3530 }
3531 auto *LowerBound = E->getLowerBound();
3532 llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
3533 if (LowerBound && LowerBound->isIntegerConstantExpr(ConstLowerBound, C)) {
3534 ConstLowerBound = ConstLowerBound.zextOrTrunc(PointerWidthInBits);
3535 LowerBound = nullptr;
3536 }
3537 if (!Length)
3538 --ConstLength;
3539 else if (!LowerBound)
3540 --ConstLowerBound;
3541
3542 if (Length || LowerBound) {
3543 auto *LowerBoundVal =
3544 LowerBound
3545 ? Builder.CreateIntCast(
3546 EmitScalarExpr(LowerBound), IntPtrTy,
3547 LowerBound->getType()->hasSignedIntegerRepresentation())
3548 : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
3549 auto *LengthVal =
3550 Length
3551 ? Builder.CreateIntCast(
3552 EmitScalarExpr(Length), IntPtrTy,
3553 Length->getType()->hasSignedIntegerRepresentation())
3554 : llvm::ConstantInt::get(IntPtrTy, ConstLength);
3555 Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
3556 /*HasNUW=*/false,
3557 !getLangOpts().isSignedOverflowDefined());
3558 if (Length && LowerBound) {
3559 Idx = Builder.CreateSub(
3560 Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
3561 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3562 }
3563 } else
3564 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
3565 } else {
3566 // Idx = ArraySize - 1;
3567 QualType ArrayTy = BaseTy->isPointerType()
3568 ? E->getBase()->IgnoreParenImpCasts()->getType()
3569 : BaseTy;
3570 if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
3571 Length = VAT->getSizeExpr();
3572 if (Length->isIntegerConstantExpr(ConstLength, C))
3573 Length = nullptr;
3574 } else {
3575 auto *CAT = C.getAsConstantArrayType(ArrayTy);
3576 ConstLength = CAT->getSize();
3577 }
3578 if (Length) {
3579 auto *LengthVal = Builder.CreateIntCast(
3580 EmitScalarExpr(Length), IntPtrTy,
3581 Length->getType()->hasSignedIntegerRepresentation());
3582 Idx = Builder.CreateSub(
3583 LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
3584 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3585 } else {
3586 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3587 --ConstLength;
3588 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
3589 }
3590 }
3591 }
3592 assert(Idx)(static_cast <bool> (Idx) ? void (0) : __assert_fail ("Idx"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3592, __extension__ __PRETTY_FUNCTION__))
;
3593
3594 Address EltPtr = Address::invalid();
3595 LValueBaseInfo BaseInfo;
3596 TBAAAccessInfo TBAAInfo;
3597 if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
9
Taking false branch
3598 // The base must be a pointer, which is not an aggregate. Emit
3599 // it. It needs to be emitted first in case it's what captures
3600 // the VLA bounds.
3601 Address Base =
3602 emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
3603 BaseTy, VLA->getElementType(), IsLowerBound);
3604 // The element count here is the total number of non-VLA elements.
3605 llvm::Value *NumElements = getVLASize(VLA).NumElts;
3606
3607 // Effectively, the multiply by the VLA size is part of the GEP.
3608 // GEP indexes are signed, and scaling an index isn't permitted to
3609 // signed-overflow, so we use the same semantics for our explicit
3610 // multiply. We suppress this if overflow is not undefined behavior.
3611 if (getLangOpts().isSignedOverflowDefined())
3612 Idx = Builder.CreateMul(Idx, NumElements);
3613 else
3614 Idx = Builder.CreateNSWMul(Idx, NumElements);
3615 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
3616 !getLangOpts().isSignedOverflowDefined(),
3617 /*SignedIndices=*/false, E->getExprLoc());
3618 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
10
Taking true branch
3619 // If this is A[i] where A is an array, the frontend will have decayed the
3620 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3621 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3622 // "gep x, i" here. Emit one "gep A, 0, i".
3623 assert(Array->getType()->isArrayType() &&(static_cast <bool> (Array->getType()->isArrayType
() && "Array to pointer decay must have array source type!"
) ? void (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3624, __extension__ __PRETTY_FUNCTION__))
3624 "Array to pointer decay must have array source type!")(static_cast <bool> (Array->getType()->isArrayType
() && "Array to pointer decay must have array source type!"
) ? void (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3624, __extension__ __PRETTY_FUNCTION__))
;
3625 LValue ArrayLV;
3626 // For simple multidimensional array indexing, set the 'accessed' flag for
3627 // better bounds-checking of the base expression.
3628 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
11
Assuming 'ASE' is non-null
12
Taking true branch
3629 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
13
Calling 'CodeGenFunction::EmitArraySubscriptExpr'
3630 else
3631 ArrayLV = EmitLValue(Array);
3632
3633 // Propagate the alignment from the array itself to the result.
3634 EltPtr = emitArraySubscriptGEP(
3635 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3636 ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
3637 /*SignedIndices=*/false, E->getExprLoc());
3638 BaseInfo = ArrayLV.getBaseInfo();
3639 TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
3640 } else {
3641 Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
3642 TBAAInfo, BaseTy, ResultExprTy,
3643 IsLowerBound);
3644 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
3645 !getLangOpts().isSignedOverflowDefined(),
3646 /*SignedIndices=*/false, E->getExprLoc());
3647 }
3648
3649 return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
3650}
3651
3652LValue CodeGenFunction::
3653EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
3654 // Emit the base vector as an l-value.
3655 LValue Base;
3656
3657 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
3658 if (E->isArrow()) {
3659 // If it is a pointer to a vector, emit the address and form an lvalue with
3660 // it.
3661 LValueBaseInfo BaseInfo;
3662 TBAAAccessInfo TBAAInfo;
3663 Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
3664 const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
3665 Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
3666 Base.getQuals().removeObjCGCAttr();
3667 } else if (E->getBase()->isGLValue()) {
3668 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
3669 // emit the base as an lvalue.
3670 assert(E->getBase()->getType()->isVectorType())(static_cast <bool> (E->getBase()->getType()->
isVectorType()) ? void (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3670, __extension__ __PRETTY_FUNCTION__))
;
3671 Base = EmitLValue(E->getBase());
3672 } else {
3673 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
3674 assert(E->getBase()->getType()->isVectorType() &&(static_cast <bool> (E->getBase()->getType()->
isVectorType() && "Result must be a vector") ? void (
0) : __assert_fail ("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3675, __extension__ __PRETTY_FUNCTION__))
3675 "Result must be a vector")(static_cast <bool> (E->getBase()->getType()->
isVectorType() && "Result must be a vector") ? void (
0) : __assert_fail ("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3675, __extension__ __PRETTY_FUNCTION__))
;
3676 llvm::Value *Vec = EmitScalarExpr(E->getBase());
3677
3678 // Store the vector to memory (because LValue wants an address).
3679 Address VecMem = CreateMemTemp(E->getBase()->getType());
3680 Builder.CreateStore(Vec, VecMem);
3681 Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
3682 AlignmentSource::Decl);
3683 }
3684
3685 QualType type =
3686 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
3687
3688 // Encode the element access list into a vector of unsigned indices.
3689 SmallVector<uint32_t, 4> Indices;
3690 E->getEncodedElementAccess(Indices);
3691
3692 if (Base.isSimple()) {
3693 llvm::Constant *CV =
3694 llvm::ConstantDataVector::get(getLLVMContext(), Indices);
3695 return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
3696 Base.getBaseInfo(), TBAAAccessInfo());
3697 }
3698 assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!")(static_cast <bool> (Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!"
) ? void (0) : __assert_fail ("Base.isExtVectorElt() && \"Can only subscript lvalue vec elts here!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3698, __extension__ __PRETTY_FUNCTION__))
;
3699
3700 llvm::Constant *BaseElts = Base.getExtVectorElts();
3701 SmallVector<llvm::Constant *, 4> CElts;
3702
3703 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
3704 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
3705 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
3706 return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
3707 Base.getBaseInfo(), TBAAAccessInfo());
3708}
3709
3710LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
3711 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
3712 EmitIgnoredExpr(E->getBase());
3713 return EmitDeclRefLValue(DRE);
3714 }
3715
3716 Expr *BaseExpr = E->getBase();
3717 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
3718 LValue BaseLV;
3719 if (E->isArrow()) {
3720 LValueBaseInfo BaseInfo;
3721 TBAAAccessInfo TBAAInfo;
3722 Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
3723 QualType PtrTy = BaseExpr->getType()->getPointeeType();
3724 SanitizerSet SkippedChecks;
3725 bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
3726 if (IsBaseCXXThis)
3727 SkippedChecks.set(SanitizerKind::Alignment, true);
3728 if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
3729 SkippedChecks.set(SanitizerKind::Null, true);
3730 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
3731 /*Alignment=*/CharUnits::Zero(), SkippedChecks);
3732 BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
3733 } else
3734 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
3735
3736 NamedDecl *ND = E->getMemberDecl();
3737 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
3738 LValue LV = EmitLValueForField(BaseLV, Field);
3739 setObjCGCLValueClass(getContext(), E, LV);
3740 return LV;
3741 }
3742
3743 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
3744 return EmitFunctionDeclLValue(*this, E, FD);
3745
3746 llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3746)
;
3747}
3748
3749/// Given that we are currently emitting a lambda, emit an l-value for
3750/// one of its members.
3751LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
3752 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda())(static_cast <bool> (cast<CXXMethodDecl>(CurCodeDecl
)->getParent()->isLambda()) ? void (0) : __assert_fail (
"cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3752, __extension__ __PRETTY_FUNCTION__))
;
3753 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent())(static_cast <bool> (cast<CXXMethodDecl>(CurCodeDecl
)->getParent() == Field->getParent()) ? void (0) : __assert_fail
("cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3753, __extension__ __PRETTY_FUNCTION__))
;
3754 QualType LambdaTagType =
3755 getContext().getTagDeclType(Field->getParent());
3756 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
3757 return EmitLValueForField(LambdaLV, Field);
3758}
3759
3760/// Drill down to the storage of a field without walking into
3761/// reference types.
3762///
3763/// The resulting address doesn't necessarily have the right type.
3764static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
3765 const FieldDecl *field) {
3766 const RecordDecl *rec = field->getParent();
3767
3768 unsigned idx =
3769 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
3770
3771 CharUnits offset;
3772 // Adjust the alignment down to the given offset.
3773 // As a special case, if the LLVM field index is 0, we know that this
3774 // is zero.
3775 assert((idx != 0 || CGF.getContext().getASTRecordLayout(rec)(static_cast <bool> ((idx != 0 || CGF.getContext().getASTRecordLayout
(rec) .getFieldOffset(field->getFieldIndex()) == 0) &&
"LLVM field at index zero had non-zero offset?") ? void (0) :
__assert_fail ("(idx != 0 || CGF.getContext().getASTRecordLayout(rec) .getFieldOffset(field->getFieldIndex()) == 0) && \"LLVM field at index zero had non-zero offset?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3777, __extension__ __PRETTY_FUNCTION__))
3776 .getFieldOffset(field->getFieldIndex()) == 0) &&(static_cast <bool> ((idx != 0 || CGF.getContext().getASTRecordLayout
(rec) .getFieldOffset(field->getFieldIndex()) == 0) &&
"LLVM field at index zero had non-zero offset?") ? void (0) :
__assert_fail ("(idx != 0 || CGF.getContext().getASTRecordLayout(rec) .getFieldOffset(field->getFieldIndex()) == 0) && \"LLVM field at index zero had non-zero offset?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3777, __extension__ __PRETTY_FUNCTION__))
3777 "LLVM field at index zero had non-zero offset?")(static_cast <bool> ((idx != 0 || CGF.getContext().getASTRecordLayout
(rec) .getFieldOffset(field->getFieldIndex()) == 0) &&
"LLVM field at index zero had non-zero offset?") ? void (0) :
__assert_fail ("(idx != 0 || CGF.getContext().getASTRecordLayout(rec) .getFieldOffset(field->getFieldIndex()) == 0) && \"LLVM field at index zero had non-zero offset?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3777, __extension__ __PRETTY_FUNCTION__))
;
3778 if (idx != 0) {
3779 auto &recLayout = CGF.getContext().getASTRecordLayout(rec);
3780 auto offsetInBits = recLayout.getFieldOffset(field->getFieldIndex());
3781 offset = CGF.getContext().toCharUnitsFromBits(offsetInBits);
3782 }
3783
3784 return CGF.Builder.CreateStructGEP(base, idx, offset, field->getName());
3785}
3786
3787static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
3788 const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
3789 if (!RD)
3790 return false;
3791
3792 if (RD->isDynamicClass())
3793 return true;
3794
3795 for (const auto &Base : RD->bases())
3796 if (hasAnyVptr(Base.getType(), Context))
3797 return true;
3798
3799 for (const FieldDecl *Field : RD->fields())
3800 if (hasAnyVptr(Field->getType(), Context))
3801 return true;
3802
3803 return false;
3804}
3805
3806LValue CodeGenFunction::EmitLValueForField(LValue base,
3807 const FieldDecl *field) {
3808 LValueBaseInfo BaseInfo = base.getBaseInfo();
3809
3810 if (field->isBitField()) {
3811 const CGRecordLayout &RL =
3812 CGM.getTypes().getCGRecordLayout(field->getParent());
3813 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
3814 Address Addr = base.getAddress();
3815 unsigned Idx = RL.getLLVMFieldNo(field);
3816 if (Idx != 0)
3817 // For structs, we GEP to the field that the record layout suggests.
3818 Addr = Builder.CreateStructGEP(Addr, Idx, Info.StorageOffset,
3819 field->getName());
3820 // Get the access type.
3821 llvm::Type *FieldIntTy =
3822 llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
3823 if (Addr.getElementType() != FieldIntTy)
3824 Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
3825
3826 QualType fieldType =
3827 field->getType().withCVRQualifiers(base.getVRQualifiers());
3828 // TODO: Support TBAA for bit fields.
3829 LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
3830 return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
3831 TBAAAccessInfo());
3832 }
3833
3834 // Fields of may-alias structures are may-alias themselves.
3835 // FIXME: this should get propagated down through anonymous structs
3836 // and unions.
3837 QualType FieldType = field->getType();
3838 const RecordDecl *rec = field->getParent();
3839 AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
3840 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
3841 TBAAAccessInfo FieldTBAAInfo;
3842 if (base.getTBAAInfo().isMayAlias() ||
3843 rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
3844 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
3845 } else if (rec->isUnion()) {
3846 // TODO: Support TBAA for unions.
3847 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
3848 } else {
3849 // If no base type been assigned for the base access, then try to generate
3850 // one for this base lvalue.
3851 FieldTBAAInfo = base.getTBAAInfo();
3852 if (!FieldTBAAInfo.BaseType) {
3853 FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
3854 assert(!FieldTBAAInfo.Offset &&(static_cast <bool> (!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? void (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3855, __extension__ __PRETTY_FUNCTION__))
3855 "Nonzero offset for an access with no base type!")(static_cast <bool> (!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? void (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3855, __extension__ __PRETTY_FUNCTION__))
;
3856 }
3857
3858 // Adjust offset to be relative to the base type.
3859 const ASTRecordLayout &Layout =
3860 getContext().getASTRecordLayout(field->getParent());
3861 unsigned CharWidth = getContext().getCharWidth();
3862 if (FieldTBAAInfo.BaseType)
3863 FieldTBAAInfo.Offset +=
3864 Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
3865
3866 // Update the final access type and size.
3867 FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
3868 FieldTBAAInfo.Size =
3869 getContext().getTypeSizeInChars(FieldType).getQuantity();
3870 }
3871
3872 Address addr = base.getAddress();
3873 if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
3874 if (CGM.getCodeGenOpts().StrictVTablePointers &&
3875 ClassDef->isDynamicClass()) {
3876 // Getting to any field of dynamic object requires stripping dynamic
3877 // information provided by invariant.group. This is because accessing
3878 // fields may leak the real address of dynamic object, which could result
3879 // in miscompilation when leaked pointer would be compared.
3880 auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
3881 addr = Address(stripped, addr.getAlignment());
3882 }
3883 }
3884
3885 unsigned RecordCVR = base.getVRQualifiers();
3886 if (rec->isUnion()) {
3887 // For unions, there is no pointer adjustment.
3888 assert(!FieldType->isReferenceType() && "union has reference member")(static_cast <bool> (!FieldType->isReferenceType() &&
"union has reference member") ? void (0) : __assert_fail ("!FieldType->isReferenceType() && \"union has reference member\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3888, __extension__ __PRETTY_FUNCTION__))
;
3889 if (CGM.getCodeGenOpts().StrictVTablePointers &&
3890 hasAnyVptr(FieldType, getContext()))
3891 // Because unions can easily skip invariant.barriers, we need to add
3892 // a barrier every time CXXRecord field with vptr is referenced.
3893 addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
3894 addr.getAlignment());
3895 } else {
3896 // For structs, we GEP to the field that the record layout suggests.
3897 addr = emitAddrOfFieldStorage(*this, addr, field);
3898
3899 // If this is a reference field, load the reference right now.
3900 if (FieldType->isReferenceType()) {
3901 LValue RefLVal = MakeAddrLValue(addr, FieldType, FieldBaseInfo,
3902 FieldTBAAInfo);
3903 if (RecordCVR & Qualifiers::Volatile)
3904 RefLVal.getQuals().setVolatile(true);
3905 addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
3906
3907 // Qualifiers on the struct don't apply to the referencee.
3908 RecordCVR = 0;
3909 FieldType = FieldType->getPointeeType();
3910 }
3911 }
3912
3913 // Make sure that the address is pointing to the right type. This is critical
3914 // for both unions and structs. A union needs a bitcast, a struct element
3915 // will need a bitcast if the LLVM type laid out doesn't match the desired
3916 // type.
3917 addr = Builder.CreateElementBitCast(
3918 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
3919
3920 if (field->hasAttr<AnnotateAttr>())
3921 addr = EmitFieldAnnotations(field, addr);
3922
3923 LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
3924 LV.getQuals().addCVRQualifiers(RecordCVR);
3925
3926 // __weak attribute on a field is ignored.
3927 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
3928 LV.getQuals().removeObjCGCAttr();
3929
3930 return LV;
3931}
3932
3933LValue
3934CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
3935 const FieldDecl *Field) {
3936 QualType FieldType = Field->getType();
3937
3938 if (!FieldType->isReferenceType())
3939 return EmitLValueForField(Base, Field);
3940
3941 Address V = emitAddrOfFieldStorage(*this, Base.getAddress(), Field);
3942
3943 // Make sure that the address is pointing to the right type.
3944 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
3945 V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
3946
3947 // TODO: Generate TBAA information that describes this access as a structure
3948 // member access and not just an access to an object of the field's type. This
3949 // should be similar to what we do in EmitLValueForField().
3950 LValueBaseInfo BaseInfo = Base.getBaseInfo();
3951 AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
3952 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
3953 return MakeAddrLValue(V, FieldType, FieldBaseInfo,
3954 CGM.getTBAAInfoForSubobject(Base, FieldType));
3955}
3956
3957LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
3958 if (E->isFileScope()) {
3959 ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
3960 return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
3961 }
3962 if (E->getType()->isVariablyModifiedType())
3963 // make sure to emit the VLA size.
3964 EmitVariablyModifiedType(E->getType());
3965
3966 Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
3967 const Expr *InitExpr = E->getInitializer();
3968 LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
3969
3970 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
3971 /*Init*/ true);
3972
3973 return Result;
3974}
3975
3976LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
3977 if (!E->isGLValue())
3978 // Initializing an aggregate temporary in C++11: T{...}.
3979 return EmitAggExprToLValue(E);
3980
3981 // An lvalue initializer list must be initializing a reference.
3982 assert(E->isTransparent() && "non-transparent glvalue init list")(static_cast <bool> (E->isTransparent() && "non-transparent glvalue init list"
) ? void (0) : __assert_fail ("E->isTransparent() && \"non-transparent glvalue init list\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3982, __extension__ __PRETTY_FUNCTION__))
;
3983 return EmitLValue(E->getInit(0));
3984}
3985
3986/// Emit the operand of a glvalue conditional operator. This is either a glvalue
3987/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
3988/// LValue is returned and the current block has been terminated.
3989static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
3990 const Expr *Operand) {
3991 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
3992 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
3993 return None;
3994 }
3995
3996 return CGF.EmitLValue(Operand);
3997}
3998
3999LValue CodeGenFunction::
4000EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
4001 if (!expr->isGLValue()) {
4002 // ?: here should be an aggregate.
4003 assert(hasAggregateEvaluationKind(expr->getType()) &&(static_cast <bool> (hasAggregateEvaluationKind(expr->
getType()) && "Unexpected conditional operator!") ? void
(0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4004, __extension__ __PRETTY_FUNCTION__))
4004 "Unexpected conditional operator!")(static_cast <bool> (hasAggregateEvaluationKind(expr->
getType()) && "Unexpected conditional operator!") ? void
(0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4004, __extension__ __PRETTY_FUNCTION__))
;
4005 return EmitAggExprToLValue(expr);
4006 }
4007
4008 OpaqueValueMapping binding(*this, expr);
4009
4010 const Expr *condExpr = expr->getCond();
4011 bool CondExprBool;
4012 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
4013 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
4014 if (!CondExprBool) std::swap(live, dead);
4015
4016 if (!ContainsLabel(dead)) {
4017 // If the true case is live, we need to track its region.
4018 if (CondExprBool)
4019 incrementProfileCounter(expr);
4020 return EmitLValue(live);
4021 }
4022 }
4023
4024 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
4025 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
4026 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
4027
4028 ConditionalEvaluation eval(*this);
4029 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
4030
4031 // Any temporaries created here are conditional.
4032 EmitBlock(lhsBlock);
4033 incrementProfileCounter(expr);
4034 eval.begin(*this);
4035 Optional<LValue> lhs =
4036 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
4037 eval.end(*this);
4038
4039 if (lhs && !lhs->isSimple())
4040 return EmitUnsupportedLValue(expr, "conditional operator");
4041
4042 lhsBlock = Builder.GetInsertBlock();
4043 if (lhs)
4044 Builder.CreateBr(contBlock);
4045
4046 // Any temporaries created here are conditional.
4047 EmitBlock(rhsBlock);
4048 eval.begin(*this);
4049 Optional<LValue> rhs =
4050 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
4051 eval.end(*this);
4052 if (rhs && !rhs->isSimple())
4053 return EmitUnsupportedLValue(expr, "conditional operator");
4054 rhsBlock = Builder.GetInsertBlock();
4055
4056 EmitBlock(contBlock);
4057
4058 if (lhs && rhs) {
4059 llvm::PHINode *phi = Builder.CreatePHI(lhs->getPointer()->getType(),
4060 2, "cond-lvalue");
4061 phi->addIncoming(lhs->getPointer(), lhsBlock);
4062 phi->addIncoming(rhs->getPointer(), rhsBlock);
4063 Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
4064 AlignmentSource alignSource =
4065 std::max(lhs->getBaseInfo().getAlignmentSource(),
4066 rhs->getBaseInfo().getAlignmentSource());
4067 TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
4068 lhs->getTBAAInfo(), rhs->getTBAAInfo());
4069 return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
4070 TBAAInfo);
4071 } else {
4072 assert((lhs || rhs) &&(static_cast <bool> ((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? void (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4073, __extension__ __PRETTY_FUNCTION__))
4073 "both operands of glvalue conditional are throw-expressions?")(static_cast <bool> ((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? void (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4073, __extension__ __PRETTY_FUNCTION__))
;
4074 return lhs ? *lhs : *rhs;
4075 }
4076}
4077
4078/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4079/// type. If the cast is to a reference, we can have the usual lvalue result,
4080/// otherwise if a cast is needed by the code generator in an lvalue context,
4081/// then it must mean that we need the address of an aggregate in order to
4082/// access one of its members. This can happen for all the reasons that casts
4083/// are permitted with aggregate result, including noop aggregate casts, and
4084/// cast from scalar to union.
4085LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
4086 switch (E->getCastKind()) {
4087 case CK_ToVoid:
4088 case CK_BitCast:
4089 case CK_ArrayToPointerDecay:
4090 case CK_FunctionToPointerDecay:
4091 case CK_NullToMemberPointer:
4092 case CK_NullToPointer:
4093 case CK_IntegralToPointer:
4094 case CK_PointerToIntegral:
4095 case CK_PointerToBoolean:
4096 case CK_VectorSplat:
4097 case CK_IntegralCast:
4098 case CK_BooleanToSignedIntegral:
4099 case CK_IntegralToBoolean:
4100 case CK_IntegralToFloating:
4101 case CK_FloatingToIntegral:
4102 case CK_FloatingToBoolean:
4103 case CK_FloatingCast:
4104 case CK_FloatingRealToComplex:
4105 case CK_FloatingComplexToReal:
4106 case CK_FloatingComplexToBoolean:
4107 case CK_FloatingComplexCast:
4108 case CK_FloatingComplexToIntegralComplex:
4109 case CK_IntegralRealToComplex:
4110 case CK_IntegralComplexToReal:
4111 case CK_IntegralComplexToBoolean:
4112 case CK_IntegralComplexCast:
4113 case CK_IntegralComplexToFloatingComplex:
4114 case CK_DerivedToBaseMemberPointer:
4115 case CK_BaseToDerivedMemberPointer:
4116 case CK_MemberPointerToBoolean:
4117 case CK_ReinterpretMemberPointer:
4118 case CK_AnyPointerToBlockPointerCast:
4119 case CK_ARCProduceObject:
4120 case CK_ARCConsumeObject:
4121 case CK_ARCReclaimReturnedObject:
4122 case CK_ARCExtendBlockObject:
4123 case CK_CopyAndAutoreleaseBlockObject:
4124 case CK_AddressSpaceConversion:
4125 case CK_IntToOCLSampler:
4126 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
4127
4128 case CK_Dependent:
4129 llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4129)
;
4130
4131 case CK_BuiltinFnToFnPtr:
4132 llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4132)
;
4133
4134 // These are never l-values; just use the aggregate emission code.
4135 case CK_NonAtomicToAtomic:
4136 case CK_AtomicToNonAtomic:
4137 return EmitAggExprToLValue(E);
4138
4139 case CK_Dynamic: {
4140 LValue LV = EmitLValue(E->getSubExpr());
4141 Address V = LV.getAddress();
4142 const auto *DCE = cast<CXXDynamicCastExpr>(E);
4143 return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
4144 }
4145
4146 case CK_ConstructorConversion:
4147 case CK_UserDefinedConversion:
4148 case CK_CPointerToObjCPointerCast:
4149 case CK_BlockPointerToObjCPointerCast:
4150 case CK_NoOp:
4151 case CK_LValueToRValue:
4152 return EmitLValue(E->getSubExpr());
4153
4154 case CK_UncheckedDerivedToBase:
4155 case CK_DerivedToBase: {
4156 const RecordType *DerivedClassTy =
4157 E->getSubExpr()->getType()->getAs<RecordType>();
4158 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4159
4160 LValue LV = EmitLValue(E->getSubExpr());
4161 Address This = LV.getAddress();
4162
4163 // Perform the derived-to-base conversion
4164 Address Base = GetAddressOfBaseClass(
4165 This, DerivedClassDecl, E->path_begin(), E->path_end(),
4166 /*NullCheckValue=*/false, E->getExprLoc());
4167
4168 // TODO: Support accesses to members of base classes in TBAA. For now, we
4169 // conservatively pretend that the complete object is of the base class
4170 // type.
4171 return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
4172 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4173 }
4174 case CK_ToUnion:
4175 return EmitAggExprToLValue(E);
4176 case CK_BaseToDerived: {
4177 const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
4178 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4179
4180 LValue LV = EmitLValue(E->getSubExpr());
4181
4182 // Perform the base-to-derived conversion
4183 Address Derived =
4184 GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
4185 E->path_begin(), E->path_end(),
4186 /*NullCheckValue=*/false);
4187
4188 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
4189 // performed and the object is not of the derived type.
4190 if (sanitizePerformTypeCheck())
4191 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
4192 Derived.getPointer(), E->getType());
4193
4194 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
4195 EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
4196 /*MayBeNull=*/false,
4197 CFITCK_DerivedCast, E->getLocStart());
4198
4199 return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
4200 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4201 }
4202 case CK_LValueBitCast: {
4203 // This must be a reinterpret_cast (or c-style equivalent).
4204 const auto *CE = cast<ExplicitCastExpr>(E);
4205
4206 CGM.EmitExplicitCastExprType(CE, this);
4207 LValue LV = EmitLValue(E->getSubExpr());
4208 Address V = Builder.CreateBitCast(LV.getAddress(),
4209 ConvertType(CE->getTypeAsWritten()));
4210
4211 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
4212 EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
4213 /*MayBeNull=*/false,
4214 CFITCK_UnrelatedCast, E->getLocStart());
4215
4216 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4217 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4218 }
4219 case CK_ObjCObjectLValueCast: {
4220 LValue LV = EmitLValue(E->getSubExpr());
4221 Address V = Builder.CreateElementBitCast(LV.getAddress(),
4222 ConvertType(E->getType()));
4223 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4224 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4225 }
4226 case CK_ZeroToOCLQueue:
4227 llvm_unreachable("NULL to OpenCL queue lvalue cast is not valid")::llvm::llvm_unreachable_internal("NULL to OpenCL queue lvalue cast is not valid"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4227)
;
4228 case CK_ZeroToOCLEvent:
4229 llvm_unreachable("NULL to OpenCL event lvalue cast is not valid")::llvm::llvm_unreachable_internal("NULL to OpenCL event lvalue cast is not valid"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4229)
;
4230 }
4231
4232 llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4232)
;
4233}
4234
4235LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
4236 assert(OpaqueValueMappingData::shouldBindAsLValue(e))(static_cast <bool> (OpaqueValueMappingData::shouldBindAsLValue
(e)) ? void (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4236, __extension__ __PRETTY_FUNCTION__))
;
4237 return getOrCreateOpaqueLValueMapping(e);
4238}
4239
4240LValue
4241CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
4242 assert(OpaqueValueMapping::shouldBindAsLValue(e))(static_cast <bool> (OpaqueValueMapping::shouldBindAsLValue
(e)) ? void (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4242, __extension__ __PRETTY_FUNCTION__))
;
4243
4244 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
4245 it = OpaqueLValues.find(e);
4246
4247 if (it != OpaqueLValues.end())
4248 return it->second;
4249
4250 assert(e->isUnique() && "LValue for a nonunique OVE hasn't been emitted")(static_cast <bool> (e->isUnique() && "LValue for a nonunique OVE hasn't been emitted"
) ? void (0) : __assert_fail ("e->isUnique() && \"LValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4250, __extension__ __PRETTY_FUNCTION__))
;
4251 return EmitLValue(e->getSourceExpr());
4252}
4253
4254RValue
4255CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
4256 assert(!OpaqueValueMapping::shouldBindAsLValue(e))(static_cast <bool> (!OpaqueValueMapping::shouldBindAsLValue
(e)) ? void (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4256, __extension__ __PRETTY_FUNCTION__))
;
4257
4258 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
4259 it = OpaqueRValues.find(e);
4260
4261 if (it != OpaqueRValues.end())
4262 return it->second;
4263
4264 assert(e->isUnique() && "RValue for a nonunique OVE hasn't been emitted")(static_cast <bool> (e->isUnique() && "RValue for a nonunique OVE hasn't been emitted"
) ? void (0) : __assert_fail ("e->isUnique() && \"RValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4264, __extension__ __PRETTY_FUNCTION__))
;
4265 return EmitAnyExpr(e->getSourceExpr());
4266}
4267
4268RValue CodeGenFunction::EmitRValueForField(LValue LV,
4269 const FieldDecl *FD,
4270 SourceLocation Loc) {
4271 QualType FT = FD->getType();
4272 LValue FieldLV = EmitLValueForField(LV, FD);
4273 switch (getEvaluationKind(FT)) {
4274 case TEK_Complex:
4275 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
4276 case TEK_Aggregate:
4277 return FieldLV.asAggregateRValue();
4278 case TEK_Scalar:
4279 // This routine is used to load fields one-by-one to perform a copy, so
4280 // don't load reference fields.
4281 if (FD->getType()->isReferenceType())
4282 return RValue::get(FieldLV.getPointer());
4283 return EmitLoadOfLValue(FieldLV, Loc);
4284 }
4285 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4285)
;
4286}
4287
4288//===--------------------------------------------------------------------===//
4289// Expression Emission
4290//===--------------------------------------------------------------------===//
4291
4292RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
4293 ReturnValueSlot ReturnValue) {
4294 // Builtins never have block type.
4295 if (E->getCallee()->getType()->isBlockPointerType())
4296 return EmitBlockCallExpr(E, ReturnValue);
4297
4298 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
4299 return EmitCXXMemberCallExpr(CE, ReturnValue);
4300
4301 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
4302 return EmitCUDAKernelCallExpr(CE, ReturnValue);
4303
4304 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
4305 if (const CXXMethodDecl *MD =
4306 dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
4307 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
4308
4309 CGCallee callee = EmitCallee(E->getCallee());
4310
4311 if (callee.isBuiltin()) {
4312 return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
4313 E, ReturnValue);
4314 }
4315
4316 if (callee.isPseudoDestructor()) {
4317 return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
4318 }
4319
4320 return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
4321}
4322
4323/// Emit a CallExpr without considering whether it might be a subclass.
4324RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
4325 ReturnValueSlot ReturnValue) {
4326 CGCallee Callee = EmitCallee(E->getCallee());
4327 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4328}
4329
4330static CGCallee EmitDirectCallee(CodeGenFunction &CGF, const FunctionDecl *FD) {
4331 if (auto builtinID = FD->getBuiltinID()) {
4332 return CGCallee::forBuiltin(builtinID, FD);
4333 }
4334
4335 llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, FD);
4336 return CGCallee::forDirect(calleePtr, FD);
4337}
4338
4339CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
4340 E = E->IgnoreParens();
4341
4342 // Look through function-to-pointer decay.
4343 if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
4344 if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
4345 ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
4346 return EmitCallee(ICE->getSubExpr());
4347 }
4348
4349 // Resolve direct calls.
4350 } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
4351 if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
4352 return EmitDirectCallee(*this, FD);
4353 }
4354 } else if (auto ME = dyn_cast<MemberExpr>(E)) {
4355 if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
4356 EmitIgnoredExpr(ME->getBase());
4357 return EmitDirectCallee(*this, FD);
4358 }
4359
4360 // Look through template substitutions.
4361 } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
4362 return EmitCallee(NTTP->getReplacement());
4363
4364 // Treat pseudo-destructor calls differently.
4365 } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
4366 return CGCallee::forPseudoDestructor(PDE);
4367 }
4368
4369 // Otherwise, we have an indirect reference.
4370 llvm::Value *calleePtr;
4371 QualType functionType;
4372 if (auto ptrType = E->getType()->getAs<PointerType>()) {
4373 calleePtr = EmitScalarExpr(E);
4374 functionType = ptrType->getPointeeType();
4375 } else {
4376 functionType = E->getType();
4377 calleePtr = EmitLValue(E).getPointer();
4378 }
4379 assert(functionType->isFunctionType())(static_cast <bool> (functionType->isFunctionType())
? void (0) : __assert_fail ("functionType->isFunctionType()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4379, __extension__ __PRETTY_FUNCTION__))
;
4380 CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(),
4381 E->getReferencedDeclOfCallee());
4382 CGCallee callee(calleeInfo, calleePtr);
4383 return callee;
4384}
4385
4386LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
4387 // Comma expressions just emit their LHS then their RHS as an l-value.
4388 if (E->getOpcode() == BO_Comma) {
4389 EmitIgnoredExpr(E->getLHS());
4390 EnsureInsertPoint();
4391 return EmitLValue(E->getRHS());
4392 }
4393
4394 if (E->getOpcode() == BO_PtrMemD ||
4395 E->getOpcode() == BO_PtrMemI)
4396 return EmitPointerToDataMemberBinaryExpr(E);
4397
4398 assert(E->getOpcode() == BO_Assign && "unexpected binary l-value")(static_cast <bool> (E->getOpcode() == BO_Assign &&
"unexpected binary l-value") ? void (0) : __assert_fail ("E->getOpcode() == BO_Assign && \"unexpected binary l-value\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4398, __extension__ __PRETTY_FUNCTION__))
;
4399
4400 // Note that in all of these cases, __block variables need the RHS
4401 // evaluated first just in case the variable gets moved by the RHS.
4402
4403 switch (getEvaluationKind(E->getType())) {
4404 case TEK_Scalar: {
4405 switch (E->getLHS()->getType().getObjCLifetime()) {
4406 case Qualifiers::OCL_Strong:
4407 return EmitARCStoreStrong(E, /*ignored*/ false).first;
4408
4409 case Qualifiers::OCL_Autoreleasing:
4410 return EmitARCStoreAutoreleasing(E).first;
4411
4412 // No reason to do any of these differently.
4413 case Qualifiers::OCL_None:
4414 case Qualifiers::OCL_ExplicitNone:
4415 case Qualifiers::OCL_Weak:
4416 break;
4417 }
4418
4419 RValue RV = EmitAnyExpr(E->getRHS());
4420 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
4421 if (RV.isScalar())
4422 EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
4423 EmitStoreThroughLValue(RV, LV);
4424 return LV;
4425 }
4426
4427 case TEK_Complex:
4428 return EmitComplexAssignmentLValue(E);
4429
4430 case TEK_Aggregate:
4431 return EmitAggExprToLValue(E);
4432 }
4433 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4433)
;
4434}
4435
4436LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
4437 RValue RV = EmitCallExpr(E);
4438
4439 if (!RV.isScalar())
4440 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4441 AlignmentSource::Decl);
4442
4443 assert(E->getCallReturnType(getContext())->isReferenceType() &&(static_cast <bool> (E->getCallReturnType(getContext
())->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4445, __extension__ __PRETTY_FUNCTION__))
4444 "Can't have a scalar return unless the return type is a "(static_cast <bool> (E->getCallReturnType(getContext
())->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4445, __extension__ __PRETTY_FUNCTION__))
4445 "reference type!")(static_cast <bool> (E->getCallReturnType(getContext
())->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4445, __extension__ __PRETTY_FUNCTION__))
;
4446
4447 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4448}
4449
4450LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
4451 // FIXME: This shouldn't require another copy.
4452 return EmitAggExprToLValue(E);
4453}
4454
4455LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
4456 assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()(static_cast <bool> (E->getType()->getAsCXXRecordDecl
()->hasTrivialDestructor() && "binding l-value to type which needs a temporary"
) ? void (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4457, __extension__ __PRETTY_FUNCTION__))
4457 && "binding l-value to type which needs a temporary")(static_cast <bool> (E->getType()->getAsCXXRecordDecl
()->hasTrivialDestructor() && "binding l-value to type which needs a temporary"
) ? void (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4457, __extension__ __PRETTY_FUNCTION__))
;
4458 AggValueSlot Slot = CreateAggTemp(E->getType());
4459 EmitCXXConstructExpr(E, Slot);
4460 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4461}
4462
4463LValue
4464CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
4465 return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4466}
4467
4468Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
4469 return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
4470 ConvertType(E->getType()));
4471}
4472
4473LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
4474 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
4475 AlignmentSource::Decl);
4476}
4477
4478LValue
4479CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
4480 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4481 Slot.setExternallyDestructed();
4482 EmitAggExpr(E->getSubExpr(), Slot);
4483 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
4484 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4485}
4486
4487LValue
4488CodeGenFunction::EmitLambdaLValue(const LambdaExpr *E) {
4489 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4490 EmitLambdaExpr(E, Slot);
4491 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4492}
4493
4494LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
4495 RValue RV = EmitObjCMessageExpr(E);
4496
4497 if (!RV.isScalar())
4498 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4499 AlignmentSource::Decl);
4500
4501 assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&(static_cast <bool> (E->getMethodDecl()->getReturnType
()->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4503, __extension__ __PRETTY_FUNCTION__))
4502 "Can't have a scalar return unless the return type is a "(static_cast <bool> (E->getMethodDecl()->getReturnType
()->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4503, __extension__ __PRETTY_FUNCTION__))
4503 "reference type!")(static_cast <bool> (E->getMethodDecl()->getReturnType
()->isReferenceType() && "Can't have a scalar return unless the return type is a "
"reference type!") ? 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-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4503, __extension__ __PRETTY_FUNCTION__))
;
4504
4505 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4506}
4507
4508LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
4509 Address V =
4510 CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
4511 return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
4512}
4513
4514llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
4515 const ObjCIvarDecl *Ivar) {
4516 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
4517}
4518
4519LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
4520 llvm::Value *BaseValue,
4521 const ObjCIvarDecl *Ivar,
4522 unsigned CVRQualifiers) {
4523 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
4524 Ivar, CVRQualifiers);
4525}
4526
4527LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
4528 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
4529 llvm::Value *BaseValue = nullptr;
4530 const Expr *BaseExpr = E->getBase();
4531 Qualifiers BaseQuals;
4532 QualType ObjectTy;
4533 if (E->isArrow()) {
4534 BaseValue = EmitScalarExpr(BaseExpr);
4535 ObjectTy = BaseExpr->getType()->getPointeeType();
4536 BaseQuals = ObjectTy.getQualifiers();
4537 } else {
4538 LValue BaseLV = EmitLValue(BaseExpr);
4539 BaseValue = BaseLV.getPointer();
4540 ObjectTy = BaseExpr->getType();
4541 BaseQuals = ObjectTy.getQualifiers();
4542 }
4543
4544 LValue LV =
4545 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
4546 BaseQuals.getCVRQualifiers());
4547 setObjCGCLValueClass(getContext(), E, LV);
4548 return LV;
4549}
4550
4551LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
4552 // Can only get l-value for message expression returning aggregate type
4553 RValue RV = EmitAnyExprToTemp(E);
4554 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4555 AlignmentSource::Decl);
4556}
4557
4558RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
4559 const CallExpr *E, ReturnValueSlot ReturnValue,
4560 llvm::Value *Chain) {
4561 // Get the actual function type. The callee type will always be a pointer to
4562 // function type or a block pointer type.
4563 assert(CalleeType->isFunctionPointerType() &&(static_cast <bool> (CalleeType->isFunctionPointerType
() && "Call must have function pointer type!") ? void
(0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4564, __extension__ __PRETTY_FUNCTION__))
4564 "Call must have function pointer type!")(static_cast <bool> (CalleeType->isFunctionPointerType
() && "Call must have function pointer type!") ? void
(0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4564, __extension__ __PRETTY_FUNCTION__))
;
4565
4566 const Decl *TargetDecl = OrigCallee.getAbstractInfo().getCalleeDecl();
4567
4568 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl))
4569 // We can only guarantee that a function is called from the correct
4570 // context/function based on the appropriate target attributes,
4571 // so only check in the case where we have both always_inline and target
4572 // since otherwise we could be making a conditional call after a check for
4573 // the proper cpu features (and it won't cause code generation issues due to
4574 // function based code generation).
4575 if (TargetDecl->hasAttr<AlwaysInlineAttr>() &&
4576 TargetDecl->hasAttr<TargetAttr>())
4577 checkTargetFeatures(E, FD);
4578
4579 CalleeType = getContext().getCanonicalType(CalleeType);
4580
4581 auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
4582
4583 CGCallee Callee = OrigCallee;
4584
4585 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
4586 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4587 if (llvm::Constant *PrefixSig =
4588 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
4589 SanitizerScope SanScope(this);
4590 // Remove any (C++17) exception specifications, to allow calling e.g. a
4591 // noexcept function through a non-noexcept pointer.
4592 auto ProtoTy =
4593 getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
4594 llvm::Constant *FTRTTIConst =
4595 CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
4596 llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
4597 llvm::StructType *PrefixStructTy = llvm::StructType::get(
4598 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
4599
4600 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4601
4602 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
4603 CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
4604 llvm::Value *CalleeSigPtr =
4605 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
4606 llvm::Value *CalleeSig =
4607 Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
4608 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
4609
4610 llvm::BasicBlock *Cont = createBasicBlock("cont");
4611 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
4612 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
4613
4614 EmitBlock(TypeCheck);
4615 llvm::Value *CalleeRTTIPtr =
4616 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
4617 llvm::Value *CalleeRTTIEncoded =
4618 Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
4619 llvm::Value *CalleeRTTI =
4620 DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
4621 llvm::Value *CalleeRTTIMatch =
4622 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
4623 llvm::Constant *StaticData[] = {
4624 EmitCheckSourceLocation(E->getLocStart()),
4625 EmitCheckTypeDescriptor(CalleeType)
4626 };
4627 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
4628 SanitizerHandler::FunctionTypeMismatch, StaticData, CalleePtr);
4629
4630 Builder.CreateBr(Cont);
4631 EmitBlock(Cont);
4632 }
4633 }
4634
4635 const auto *FnType = cast<FunctionType>(PointeeType);
4636
4637 // If we are checking indirect calls and this call is indirect, check that the
4638 // function pointer is a member of the bit set for the function type.
4639 if (SanOpts.has(SanitizerKind::CFIICall) &&
4640 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4641 SanitizerScope SanScope(this);
4642 EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
4643
4644 llvm::Metadata *MD;
4645 if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
4646 MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
4647 else
4648 MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
4649
4650 llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
4651
4652 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4653 llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
4654 llvm::Value *TypeTest = Builder.CreateCall(
4655 CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
4656
4657 auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
4658 llvm::Constant *StaticData[] = {
4659 llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
4660 EmitCheckSourceLocation(E->getLocStart()),
4661 EmitCheckTypeDescriptor(QualType(FnType, 0)),
4662 };
4663 if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
4664 EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
4665 CastedCallee, StaticData);
4666 } else {
4667 EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
4668 SanitizerHandler::CFICheckFail, StaticData,
4669 {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
4670 }
4671 }
4672
4673 CallArgList Args;
4674 if (Chain)
4675 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
4676 CGM.getContext().VoidPtrTy);
4677
4678 // C++17 requires that we evaluate arguments to a call using assignment syntax
4679 // right-to-left, and that we evaluate arguments to certain other operators
4680 // left-to-right. Note that we allow this to override the order dictated by
4681 // the calling convention on the MS ABI, which means that parameter
4682 // destruction order is not necessarily reverse construction order.
4683 // FIXME: Revisit this based on C++ committee response to unimplementability.
4684 EvaluationOrder Order = EvaluationOrder::Default;
4685 if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
4686 if (OCE->isAssignmentOp())
4687 Order = EvaluationOrder::ForceRightToLeft;
4688 else {
4689 switch (OCE->getOperator()) {
4690 case OO_LessLess:
4691 case OO_GreaterGreater:
4692 case OO_AmpAmp:
4693 case OO_PipePipe:
4694 case OO_Comma:
4695 case OO_ArrowStar:
4696 Order = EvaluationOrder::ForceLeftToRight;
4697 break;
4698 default:
4699 break;
4700 }
4701 }
4702 }
4703
4704 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
4705 E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
4706
4707 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
4708 Args, FnType, /*isChainCall=*/Chain);
4709
4710 // C99 6.5.2.2p6:
4711 // If the expression that denotes the called function has a type
4712 // that does not include a prototype, [the default argument
4713 // promotions are performed]. If the number of arguments does not
4714 // equal the number of parameters, the behavior is undefined. If
4715 // the function is defined with a type that includes a prototype,
4716 // and either the prototype ends with an ellipsis (, ...) or the
4717 // types of the arguments after promotion are not compatible with
4718 // the types of the parameters, the behavior is undefined. If the
4719 // function is defined with a type that does not include a
4720 // prototype, and the types of the arguments after promotion are
4721 // not compatible with those of the parameters after promotion,
4722 // the behavior is undefined [except in some trivial cases].
4723 // That is, in the general case, we should assume that a call
4724 // through an unprototyped function type works like a *non-variadic*
4725 // call. The way we make this work is to cast to the exact type
4726 // of the promoted arguments.
4727 //
4728 // Chain calls use this same code path to add the invisible chain parameter
4729 // to the function type.
4730 if (isa<FunctionNoProtoType>(FnType) || Chain) {
4731 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
4732 CalleeTy = CalleeTy->getPointerTo();
4733
4734 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4735 CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
4736 Callee.setFunctionPointer(CalleePtr);
4737 }
4738
4739 return EmitCall(FnInfo, Callee, ReturnValue, Args, nullptr, E->getExprLoc());
4740}
4741
4742LValue CodeGenFunction::
4743EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
4744 Address BaseAddr = Address::invalid();
4745 if (E->getOpcode() == BO_PtrMemI) {
4746 BaseAddr = EmitPointerWithAlignment(E->getLHS());
4747 } else {
4748 BaseAddr = EmitLValue(E->getLHS()).getAddress();
4749 }
4750
4751 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
4752
4753 const MemberPointerType *MPT
4754 = E->getRHS()->getType()->getAs<MemberPointerType>();
4755
4756 LValueBaseInfo BaseInfo;
4757 TBAAAccessInfo TBAAInfo;
4758 Address MemberAddr =
4759 EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
4760 &TBAAInfo);
4761
4762 return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
4763}
4764
4765/// Given the address of a temporary variable, produce an r-value of
4766/// its type.
4767RValue CodeGenFunction::convertTempToRValue(Address addr,
4768 QualType type,
4769 SourceLocation loc) {
4770 LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
4771 switch (getEvaluationKind(type)) {
4772 case TEK_Complex:
4773 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
4774 case TEK_Aggregate:
4775 return lvalue.asAggregateRValue();
4776 case TEK_Scalar:
4777 return RValue::get(EmitLoadOfScalar(lvalue, loc));
4778 }
4779 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4779)
;
4780}
4781
4782void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
4783 assert(Val->getType()->isFPOrFPVectorTy())(static_cast <bool> (Val->getType()->isFPOrFPVectorTy
()) ? void (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4783, __extension__ __PRETTY_FUNCTION__))
;
4784 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
4785 return;
4786
4787 llvm::MDBuilder MDHelper(getLLVMContext());
4788 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
4789
4790 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
4791}
4792
4793namespace {
4794 struct LValueOrRValue {
4795 LValue LV;
4796 RValue RV;
4797 };
4798}
4799
4800static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
4801 const PseudoObjectExpr *E,
4802 bool forLValue,
4803 AggValueSlot slot) {
4804 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
4805
4806 // Find the result expression, if any.
4807 const Expr *resultExpr = E->getResultExpr();
4808 LValueOrRValue result;
4809
4810 for (PseudoObjectExpr::const_semantics_iterator
4811 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
4812 const Expr *semantic = *i;
4813
4814 // If this semantic expression is an opaque value, bind it
4815 // to the result of its source expression.
4816 if (const auto *ov = dyn_cast<OpaqueValueExpr>(semantic)) {
4817 // Skip unique OVEs.
4818 if (ov->isUnique()) {
4819 assert(ov != resultExpr &&(static_cast <bool> (ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? void (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4820, __extension__ __PRETTY_FUNCTION__))
4820 "A unique OVE cannot be used as the result expression")(static_cast <bool> (ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? void (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4820, __extension__ __PRETTY_FUNCTION__))
;
4821 continue;
4822 }
4823
4824 // If this is the result expression, we may need to evaluate
4825 // directly into the slot.
4826 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
4827 OVMA opaqueData;
4828 if (ov == resultExpr && ov->isRValue() && !forLValue &&
4829 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
4830 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
4831 LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
4832 AlignmentSource::Decl);
4833 opaqueData = OVMA::bind(CGF, ov, LV);
4834 result.RV = slot.asRValue();
4835
4836 // Otherwise, emit as normal.
4837 } else {
4838 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
4839
4840 // If this is the result, also evaluate the result now.
4841 if (ov == resultExpr) {
4842 if (forLValue)
4843 result.LV = CGF.EmitLValue(ov);
4844 else
4845 result.RV = CGF.EmitAnyExpr(ov, slot);
4846 }
4847 }
4848
4849 opaques.push_back(opaqueData);
4850
4851 // Otherwise, if the expression is the result, evaluate it
4852 // and remember the result.
4853 } else if (semantic == resultExpr) {
4854 if (forLValue)
4855 result.LV = CGF.EmitLValue(semantic);
4856 else
4857 result.RV = CGF.EmitAnyExpr(semantic, slot);
4858
4859 // Otherwise, evaluate the expression in an ignored context.
4860 } else {
4861 CGF.EmitIgnoredExpr(semantic);
4862 }
4863 }
4864
4865 // Unbind all the opaques now.
4866 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
4867 opaques[i].unbind(CGF);
4868
4869 return result;
4870}
4871
4872RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
4873 AggValueSlot slot) {
4874 return emitPseudoObjectExpr(*this, E, false, slot).RV;
4875}
4876
4877LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
4878 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
4879}