Bug Summary

File:tools/clang/lib/CodeGen/CGExpr.cpp
Warning:line 4385, column 50
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CGExpr.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~svn374814/build-llvm/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen -I /build/llvm-toolchain-snapshot-10~svn374814/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn374814/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~svn374814/build-llvm/include -I /build/llvm-toolchain-snapshot-10~svn374814/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~svn374814/build-llvm/tools/clang/lib/CodeGen -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~svn374814=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2019-10-15-035155-28452-1 -x c++ /build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp
1//===--- CGExpr.cpp - Emit LLVM Code from Expressions ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This contains code to emit Expr nodes as LLVM code.
10//
11//===----------------------------------------------------------------------===//
12
13#include "CGCXXABI.h"
14#include "CGCall.h"
15#include "CGCleanup.h"
16#include "CGDebugInfo.h"
17#include "CGObjCRuntime.h"
18#include "CGOpenMPRuntime.h"
19#include "CGRecordLayout.h"
20#include "CodeGenFunction.h"
21#include "CodeGenModule.h"
22#include "ConstantEmitter.h"
23#include "TargetInfo.h"
24#include "clang/AST/ASTContext.h"
25#include "clang/AST/Attr.h"
26#include "clang/AST/DeclObjC.h"
27#include "clang/AST/NSAPI.h"
28#include "clang/Basic/Builtins.h"
29#include "clang/Basic/CodeGenOptions.h"
30#include "llvm/ADT/Hashing.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/IR/DataLayout.h"
33#include "llvm/IR/Intrinsics.h"
34#include "llvm/IR/LLVMContext.h"
35#include "llvm/IR/MDBuilder.h"
36#include "llvm/Support/ConvertUTF.h"
37#include "llvm/Support/MathExtras.h"
38#include "llvm/Support/Path.h"
39#include "llvm/Transforms/Utils/SanitizerStats.h"
40
41#include <string>
42
43using namespace clang;
44using namespace CodeGen;
45
46//===--------------------------------------------------------------------===//
47// Miscellaneous Helper Methods
48//===--------------------------------------------------------------------===//
49
50llvm::Value *CodeGenFunction::EmitCastToVoidPtr(llvm::Value *value) {
51 unsigned addressSpace =
52 cast<llvm::PointerType>(value->getType())->getAddressSpace();
53
54 llvm::PointerType *destType = Int8PtrTy;
55 if (addressSpace)
56 destType = llvm::Type::getInt8PtrTy(getLLVMContext(), addressSpace);
57
58 if (value->getType() == destType) return value;
59 return Builder.CreateBitCast(value, destType);
60}
61
62/// CreateTempAlloca - This creates a alloca and inserts it into the entry
63/// block.
64Address CodeGenFunction::CreateTempAllocaWithoutCast(llvm::Type *Ty,
65 CharUnits Align,
66 const Twine &Name,
67 llvm::Value *ArraySize) {
68 auto Alloca = CreateTempAlloca(Ty, Name, ArraySize);
69 Alloca->setAlignment(Align.getAsAlign());
70 return Address(Alloca, Align);
71}
72
73/// CreateTempAlloca - This creates a alloca and inserts it into the entry
74/// block. The alloca is casted to default address space if necessary.
75Address CodeGenFunction::CreateTempAlloca(llvm::Type *Ty, CharUnits Align,
76 const Twine &Name,
77 llvm::Value *ArraySize,
78 Address *AllocaAddr) {
79 auto Alloca = CreateTempAllocaWithoutCast(Ty, Align, Name, ArraySize);
80 if (AllocaAddr)
81 *AllocaAddr = Alloca;
82 llvm::Value *V = Alloca.getPointer();
83 // Alloca always returns a pointer in alloca address space, which may
84 // be different from the type defined by the language. For example,
85 // in C++ the auto variables are in the default address space. Therefore
86 // cast alloca to the default address space when necessary.
87 if (getASTAllocaAddressSpace() != LangAS::Default) {
88 auto DestAddrSpace = getContext().getTargetAddressSpace(LangAS::Default);
89 llvm::IRBuilderBase::InsertPointGuard IPG(Builder);
90 // When ArraySize is nullptr, alloca is inserted at AllocaInsertPt,
91 // otherwise alloca is inserted at the current insertion point of the
92 // builder.
93 if (!ArraySize)
94 Builder.SetInsertPoint(AllocaInsertPt);
95 V = getTargetHooks().performAddrSpaceCast(
96 *this, V, getASTAllocaAddressSpace(), LangAS::Default,
97 Ty->getPointerTo(DestAddrSpace), /*non-null*/ true);
98 }
99
100 return Address(V, Align);
101}
102
103/// CreateTempAlloca - This creates an alloca and inserts it into the entry
104/// block if \p ArraySize is nullptr, otherwise inserts it at the current
105/// insertion point of the builder.
106llvm::AllocaInst *CodeGenFunction::CreateTempAlloca(llvm::Type *Ty,
107 const Twine &Name,
108 llvm::Value *ArraySize) {
109 if (ArraySize)
110 return Builder.CreateAlloca(Ty, ArraySize, Name);
111 return new llvm::AllocaInst(Ty, CGM.getDataLayout().getAllocaAddrSpace(),
112 ArraySize, Name, AllocaInsertPt);
113}
114
115/// CreateDefaultAlignTempAlloca - This creates an alloca with the
116/// default alignment of the corresponding LLVM type, which is *not*
117/// guaranteed to be related in any way to the expected alignment of
118/// an AST type that might have been lowered to Ty.
119Address CodeGenFunction::CreateDefaultAlignTempAlloca(llvm::Type *Ty,
120 const Twine &Name) {
121 CharUnits Align =
122 CharUnits::fromQuantity(CGM.getDataLayout().getABITypeAlignment(Ty));
123 return CreateTempAlloca(Ty, Align, Name);
124}
125
126void CodeGenFunction::InitTempAlloca(Address Var, llvm::Value *Init) {
127 assert(isa<llvm::AllocaInst>(Var.getPointer()))((isa<llvm::AllocaInst>(Var.getPointer())) ? static_cast
<void> (0) : __assert_fail ("isa<llvm::AllocaInst>(Var.getPointer())"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 127, __PRETTY_FUNCTION__))
;
128 auto *Store = new llvm::StoreInst(Init, Var.getPointer());
129 Store->setAlignment(Var.getAlignment().getAsAlign());
130 llvm::BasicBlock *Block = AllocaInsertPt->getParent();
131 Block->getInstList().insertAfter(AllocaInsertPt->getIterator(), Store);
132}
133
134Address CodeGenFunction::CreateIRTemp(QualType Ty, const Twine &Name) {
135 CharUnits Align = getContext().getTypeAlignInChars(Ty);
136 return CreateTempAlloca(ConvertType(Ty), Align, Name);
137}
138
139Address CodeGenFunction::CreateMemTemp(QualType Ty, const Twine &Name,
140 Address *Alloca) {
141 // FIXME: Should we prefer the preferred type alignment here?
142 return CreateMemTemp(Ty, getContext().getTypeAlignInChars(Ty), Name, Alloca);
143}
144
145Address CodeGenFunction::CreateMemTemp(QualType Ty, CharUnits Align,
146 const Twine &Name, Address *Alloca) {
147 return CreateTempAlloca(ConvertTypeForMem(Ty), Align, Name,
148 /*ArraySize=*/nullptr, Alloca);
149}
150
151Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty, CharUnits Align,
152 const Twine &Name) {
153 return CreateTempAllocaWithoutCast(ConvertTypeForMem(Ty), Align, Name);
154}
155
156Address CodeGenFunction::CreateMemTempWithoutCast(QualType Ty,
157 const Twine &Name) {
158 return CreateMemTempWithoutCast(Ty, getContext().getTypeAlignInChars(Ty),
159 Name);
160}
161
162/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
163/// expression and compare the result against zero, returning an Int1Ty value.
164llvm::Value *CodeGenFunction::EvaluateExprAsBool(const Expr *E) {
165 PGO.setCurrentStmt(E);
166 if (const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>()) {
167 llvm::Value *MemPtr = EmitScalarExpr(E);
168 return CGM.getCXXABI().EmitMemberPointerIsNotNull(*this, MemPtr, MPT);
169 }
170
171 QualType BoolTy = getContext().BoolTy;
172 SourceLocation Loc = E->getExprLoc();
173 if (!E->getType()->isAnyComplexType())
174 return EmitScalarConversion(EmitScalarExpr(E), E->getType(), BoolTy, Loc);
175
176 return EmitComplexToScalarConversion(EmitComplexExpr(E), E->getType(), BoolTy,
177 Loc);
178}
179
180/// EmitIgnoredExpr - Emit code to compute the specified expression,
181/// ignoring the result.
182void CodeGenFunction::EmitIgnoredExpr(const Expr *E) {
183 if (E->isRValue())
9
Taking false branch
184 return (void) EmitAnyExpr(E, AggValueSlot::ignored(), true);
185
186 // Just emit it as an l-value and drop the result.
187 EmitLValue(E);
10
Calling 'CodeGenFunction::EmitLValue'
188}
189
190/// EmitAnyExpr - Emit code to compute the specified expression which
191/// can have any type. The result is returned as an RValue struct.
192/// If this is an aggregate expression, AggSlot indicates where the
193/// result should be returned.
194RValue CodeGenFunction::EmitAnyExpr(const Expr *E,
195 AggValueSlot aggSlot,
196 bool ignoreResult) {
197 switch (getEvaluationKind(E->getType())) {
198 case TEK_Scalar:
199 return RValue::get(EmitScalarExpr(E, ignoreResult));
200 case TEK_Complex:
201 return RValue::getComplex(EmitComplexExpr(E, ignoreResult, ignoreResult));
202 case TEK_Aggregate:
203 if (!ignoreResult && aggSlot.isIgnored())
204 aggSlot = CreateAggTemp(E->getType(), "agg-temp");
205 EmitAggExpr(E, aggSlot);
206 return aggSlot.asRValue();
207 }
208 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~svn374814/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-10~svn374814/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-10~svn374814/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-10~svn374814/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::FunctionCallee CleanupFn;
335 llvm::Constant *CleanupArg;
336 if (E->getType()->isArrayType()) {
337 CleanupFn = CodeGenFunction(CGF.CGM).generateDestroyHelper(
338 ReferenceTemporary, E->getType(),
339 CodeGenFunction::destroyCXXObject, CGF.getLangOpts().Exceptions,
340 dyn_cast_or_null<VarDecl>(M->getExtendingDecl()));
341 CleanupArg = llvm::Constant::getNullValue(CGF.Int8PtrTy);
342 } else {
343 CleanupFn = CGF.CGM.getAddrAndTypeOfCXXStructor(
344 GlobalDecl(ReferenceTemporaryDtor, Dtor_Complete));
345 CleanupArg = cast<llvm::Constant>(ReferenceTemporary.getPointer());
346 }
347 CGF.CGM.getCXXABI().registerGlobalDtor(
348 CGF, *cast<VarDecl>(M->getExtendingDecl()), CleanupFn, CleanupArg);
349 break;
350 }
351
352 case SD_FullExpression:
353 CGF.pushDestroy(NormalAndEHCleanup, ReferenceTemporary, E->getType(),
354 CodeGenFunction::destroyCXXObject,
355 CGF.getLangOpts().Exceptions);
356 break;
357
358 case SD_Automatic:
359 CGF.pushLifetimeExtendedDestroy(NormalAndEHCleanup,
360 ReferenceTemporary, E->getType(),
361 CodeGenFunction::destroyCXXObject,
362 CGF.getLangOpts().Exceptions);
363 break;
364
365 case SD_Dynamic:
366 llvm_unreachable("temporary cannot have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary cannot have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~svn374814/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.getAsAlign());
396 llvm::Constant *C = GV;
397 if (AS != LangAS::Default)
398 C = TCG.performAddrSpaceCast(
399 CGF.CGM, GV, AS, LangAS::Default,
400 GV->getValueType()->getPointerTo(
401 CGF.getContext().getTargetAddressSpace(LangAS::Default)));
402 // FIXME: Should we put the new global into a COMDAT?
403 return Address(C, alignment);
404 }
405 }
406 return CGF.CreateMemTemp(Ty, "ref.tmp", Alloca);
407 }
408 case SD_Thread:
409 case SD_Static:
410 return CGF.CGM.GetAddrOfGlobalTemporary(M, Inner);
411
412 case SD_Dynamic:
413 llvm_unreachable("temporary can't have dynamic storage duration")::llvm::llvm_unreachable_internal("temporary can't have dynamic storage duration"
, "/build/llvm-toolchain-snapshot-10~svn374814/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-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 415)
;
416}
417
418LValue CodeGenFunction::
419EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
420 const Expr *E = M->GetTemporaryExpr();
421
422 assert((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) ||(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
423 !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) &&(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
424 "Reference should never be pseudo-strong!")(((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl
()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong
()) && "Reference should never be pseudo-strong!") ? static_cast
<void> (0) : __assert_fail ("(!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) || !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) && \"Reference should never be pseudo-strong!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 424, __PRETTY_FUNCTION__))
;
425
426 // FIXME: ideally this would use EmitAnyExprToMem, however, we cannot do so
427 // as that will cause the lifetime adjustment to be lost for ARC
428 auto ownership = M->getType().getObjCLifetime();
429 if (ownership != Qualifiers::OCL_None &&
430 ownership != Qualifiers::OCL_ExplicitNone) {
431 Address Object = createReferenceTemporary(*this, M, E);
432 if (auto *Var = dyn_cast<llvm::GlobalVariable>(Object.getPointer())) {
433 Object = Address(llvm::ConstantExpr::getBitCast(Var,
434 ConvertTypeForMem(E->getType())
435 ->getPointerTo(Object.getAddressSpace())),
436 Object.getAlignment());
437
438 // createReferenceTemporary will promote the temporary to a global with a
439 // constant initializer if it can. It can only do this to a value of
440 // ARC-manageable type if the value is global and therefore "immune" to
441 // ref-counting operations. Therefore we have no need to emit either a
442 // dynamic initialization or a cleanup and we can just return the address
443 // of the temporary.
444 if (Var->hasInitializer())
445 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
446
447 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
448 }
449 LValue RefTempDst = MakeAddrLValue(Object, M->getType(),
450 AlignmentSource::Decl);
451
452 switch (getEvaluationKind(E->getType())) {
453 default: llvm_unreachable("expected scalar or aggregate expression")::llvm::llvm_unreachable_internal("expected scalar or aggregate expression"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 453)
;
454 case TEK_Scalar:
455 EmitScalarInit(E, M->getExtendingDecl(), RefTempDst, false);
456 break;
457 case TEK_Aggregate: {
458 EmitAggExpr(E, AggValueSlot::forAddr(Object,
459 E->getType().getQualifiers(),
460 AggValueSlot::IsDestructed,
461 AggValueSlot::DoesNotNeedGCBarriers,
462 AggValueSlot::IsNotAliased,
463 AggValueSlot::DoesNotOverlap));
464 break;
465 }
466 }
467
468 pushTemporaryCleanup(*this, M, E, Object);
469 return RefTempDst;
470 }
471
472 SmallVector<const Expr *, 2> CommaLHSs;
473 SmallVector<SubobjectAdjustment, 2> Adjustments;
474 E = E->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
475
476 for (const auto &Ignored : CommaLHSs)
477 EmitIgnoredExpr(Ignored);
478
479 if (const auto *opaque = dyn_cast<OpaqueValueExpr>(E)) {
480 if (opaque->getType()->isRecordType()) {
481 assert(Adjustments.empty())((Adjustments.empty()) ? static_cast<void> (0) : __assert_fail
("Adjustments.empty()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 481, __PRETTY_FUNCTION__))
;
482 return EmitOpaqueValueLValue(opaque);
483 }
484 }
485
486 // Create and initialize the reference temporary.
487 Address Alloca = Address::invalid();
488 Address Object = createReferenceTemporary(*this, M, E, &Alloca);
489 if (auto *Var = dyn_cast<llvm::GlobalVariable>(
490 Object.getPointer()->stripPointerCasts())) {
491 Object = Address(llvm::ConstantExpr::getBitCast(
492 cast<llvm::Constant>(Object.getPointer()),
493 ConvertTypeForMem(E->getType())->getPointerTo()),
494 Object.getAlignment());
495 // If the temporary is a global and has a constant initializer or is a
496 // constant temporary that we promoted to a global, we may have already
497 // initialized it.
498 if (!Var->hasInitializer()) {
499 Var->setInitializer(CGM.EmitNullConstant(E->getType()));
500 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
501 }
502 } else {
503 switch (M->getStorageDuration()) {
504 case SD_Automatic:
505 if (auto *Size = EmitLifetimeStart(
506 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
507 Alloca.getPointer())) {
508 pushCleanupAfterFullExpr<CallLifetimeEnd>(NormalEHLifetimeMarker,
509 Alloca, Size);
510 }
511 break;
512
513 case SD_FullExpression: {
514 if (!ShouldEmitLifetimeMarkers)
515 break;
516
517 // Avoid creating a conditional cleanup just to hold an llvm.lifetime.end
518 // marker. Instead, start the lifetime of a conditional temporary earlier
519 // so that it's unconditional. Don't do this with sanitizers which need
520 // more precise lifetime marks.
521 ConditionalEvaluation *OldConditional = nullptr;
522 CGBuilderTy::InsertPoint OldIP;
523 if (isInConditionalBranch() && !E->getType().isDestructedType() &&
524 !SanOpts.has(SanitizerKind::HWAddress) &&
525 !SanOpts.has(SanitizerKind::Memory) &&
526 !CGM.getCodeGenOpts().SanitizeAddressUseAfterScope) {
527 OldConditional = OutermostConditional;
528 OutermostConditional = nullptr;
529
530 OldIP = Builder.saveIP();
531 llvm::BasicBlock *Block = OldConditional->getStartingBlock();
532 Builder.restoreIP(CGBuilderTy::InsertPoint(
533 Block, llvm::BasicBlock::iterator(Block->back())));
534 }
535
536 if (auto *Size = EmitLifetimeStart(
537 CGM.getDataLayout().getTypeAllocSize(Alloca.getElementType()),
538 Alloca.getPointer())) {
539 pushFullExprCleanup<CallLifetimeEnd>(NormalEHLifetimeMarker, Alloca,
540 Size);
541 }
542
543 if (OldConditional) {
544 OutermostConditional = OldConditional;
545 Builder.restoreIP(OldIP);
546 }
547 break;
548 }
549
550 default:
551 break;
552 }
553 EmitAnyExprToMem(E, Object, Qualifiers(), /*IsInit*/true);
554 }
555 pushTemporaryCleanup(*this, M, E, Object);
556
557 // Perform derived-to-base casts and/or field accesses, to get from the
558 // temporary object we created (and, potentially, for which we extended
559 // the lifetime) to the subobject we're binding the reference to.
560 for (unsigned I = Adjustments.size(); I != 0; --I) {
561 SubobjectAdjustment &Adjustment = Adjustments[I-1];
562 switch (Adjustment.Kind) {
563 case SubobjectAdjustment::DerivedToBaseAdjustment:
564 Object =
565 GetAddressOfBaseClass(Object, Adjustment.DerivedToBase.DerivedClass,
566 Adjustment.DerivedToBase.BasePath->path_begin(),
567 Adjustment.DerivedToBase.BasePath->path_end(),
568 /*NullCheckValue=*/ false, E->getExprLoc());
569 break;
570
571 case SubobjectAdjustment::FieldAdjustment: {
572 LValue LV = MakeAddrLValue(Object, E->getType(), AlignmentSource::Decl);
573 LV = EmitLValueForField(LV, Adjustment.Field);
574 assert(LV.isSimple() &&((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__))
575 "materialized temporary field is not a simple lvalue")((LV.isSimple() && "materialized temporary field is not a simple lvalue"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"materialized temporary field is not a simple lvalue\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 575, __PRETTY_FUNCTION__))
;
576 Object = LV.getAddress();
577 break;
578 }
579
580 case SubobjectAdjustment::MemberPointerAdjustment: {
581 llvm::Value *Ptr = EmitScalarExpr(Adjustment.Ptr.RHS);
582 Object = EmitCXXMemberDataPointerAddress(E, Object, Ptr,
583 Adjustment.Ptr.MPT);
584 break;
585 }
586 }
587 }
588
589 return MakeAddrLValue(Object, M->getType(), AlignmentSource::Decl);
590}
591
592RValue
593CodeGenFunction::EmitReferenceBindingToExpr(const Expr *E) {
594 // Emit the expression as an lvalue.
595 LValue LV = EmitLValue(E);
596 assert(LV.isSimple())((LV.isSimple()) ? static_cast<void> (0) : __assert_fail
("LV.isSimple()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 596, __PRETTY_FUNCTION__))
;
597 llvm::Value *Value = LV.getPointer();
598
599 if (sanitizePerformTypeCheck() && !E->getType()->isFunctionType()) {
600 // C++11 [dcl.ref]p5 (as amended by core issue 453):
601 // If a glvalue to which a reference is directly bound designates neither
602 // an existing object or function of an appropriate type nor a region of
603 // storage of suitable size and alignment to contain an object of the
604 // reference's type, the behavior is undefined.
605 QualType Ty = E->getType();
606 EmitTypeCheck(TCK_ReferenceBinding, E->getExprLoc(), Value, Ty);
607 }
608
609 return RValue::get(Value);
610}
611
612
613/// getAccessedFieldNo - Given an encoded value and a result number, return the
614/// input field number being accessed.
615unsigned CodeGenFunction::getAccessedFieldNo(unsigned Idx,
616 const llvm::Constant *Elts) {
617 return cast<llvm::ConstantInt>(Elts->getAggregateElement(Idx))
618 ->getZExtValue();
619}
620
621/// Emit the hash_16_bytes function from include/llvm/ADT/Hashing.h.
622static llvm::Value *emitHash16Bytes(CGBuilderTy &Builder, llvm::Value *Low,
623 llvm::Value *High) {
624 llvm::Value *KMul = Builder.getInt64(0x9ddfea08eb382d69ULL);
625 llvm::Value *K47 = Builder.getInt64(47);
626 llvm::Value *A0 = Builder.CreateMul(Builder.CreateXor(Low, High), KMul);
627 llvm::Value *A1 = Builder.CreateXor(Builder.CreateLShr(A0, K47), A0);
628 llvm::Value *B0 = Builder.CreateMul(Builder.CreateXor(High, A1), KMul);
629 llvm::Value *B1 = Builder.CreateXor(Builder.CreateLShr(B0, K47), B0);
630 return Builder.CreateMul(B1, KMul);
631}
632
633bool CodeGenFunction::isNullPointerAllowed(TypeCheckKind TCK) {
634 return TCK == TCK_DowncastPointer || TCK == TCK_Upcast ||
635 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation;
636}
637
638bool CodeGenFunction::isVptrCheckRequired(TypeCheckKind TCK, QualType Ty) {
639 CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
640 return (RD && RD->hasDefinition() && RD->isDynamicClass()) &&
641 (TCK == TCK_MemberAccess || TCK == TCK_MemberCall ||
642 TCK == TCK_DowncastPointer || TCK == TCK_DowncastReference ||
643 TCK == TCK_UpcastToVirtualBase || TCK == TCK_DynamicOperation);
644}
645
646bool CodeGenFunction::sanitizePerformTypeCheck() const {
647 return SanOpts.has(SanitizerKind::Null) |
648 SanOpts.has(SanitizerKind::Alignment) |
649 SanOpts.has(SanitizerKind::ObjectSize) |
650 SanOpts.has(SanitizerKind::Vptr);
651}
652
653void CodeGenFunction::EmitTypeCheck(TypeCheckKind TCK, SourceLocation Loc,
654 llvm::Value *Ptr, QualType Ty,
655 CharUnits Alignment,
656 SanitizerSet SkippedChecks,
657 llvm::Value *ArraySize) {
658 if (!sanitizePerformTypeCheck())
659 return;
660
661 // Don't check pointers outside the default address space. The null check
662 // isn't correct, the object-size check isn't supported by LLVM, and we can't
663 // communicate the addresses to the runtime handler for the vptr check.
664 if (Ptr->getType()->getPointerAddressSpace())
665 return;
666
667 // Don't check pointers to volatile data. The behavior here is implementation-
668 // defined.
669 if (Ty.isVolatileQualified())
670 return;
671
672 SanitizerScope SanScope(this);
673
674 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;
675 llvm::BasicBlock *Done = nullptr;
676
677 // Quickly determine whether we have a pointer to an alloca. It's possible
678 // to skip null checks, and some alignment checks, for these pointers. This
679 // can reduce compile-time significantly.
680 auto PtrToAlloca = dyn_cast<llvm::AllocaInst>(Ptr->stripPointerCasts());
681
682 llvm::Value *True = llvm::ConstantInt::getTrue(getLLVMContext());
683 llvm::Value *IsNonNull = nullptr;
684 bool IsGuaranteedNonNull =
685 SkippedChecks.has(SanitizerKind::Null) || PtrToAlloca;
686 bool AllowNullPointers = isNullPointerAllowed(TCK);
687 if ((SanOpts.has(SanitizerKind::Null) || AllowNullPointers) &&
688 !IsGuaranteedNonNull) {
689 // The glvalue must not be an empty glvalue.
690 IsNonNull = Builder.CreateIsNotNull(Ptr);
691
692 // The IR builder can constant-fold the null check if the pointer points to
693 // a constant.
694 IsGuaranteedNonNull = IsNonNull == True;
695
696 // Skip the null check if the pointer is known to be non-null.
697 if (!IsGuaranteedNonNull) {
698 if (AllowNullPointers) {
699 // When performing pointer casts, it's OK if the value is null.
700 // Skip the remaining checks in that case.
701 Done = createBasicBlock("null");
702 llvm::BasicBlock *Rest = createBasicBlock("not.null");
703 Builder.CreateCondBr(IsNonNull, Rest, Done);
704 EmitBlock(Rest);
705 } else {
706 Checks.push_back(std::make_pair(IsNonNull, SanitizerKind::Null));
707 }
708 }
709 }
710
711 if (SanOpts.has(SanitizerKind::ObjectSize) &&
712 !SkippedChecks.has(SanitizerKind::ObjectSize) &&
713 !Ty->isIncompleteType()) {
714 uint64_t TySize = getContext().getTypeSizeInChars(Ty).getQuantity();
715 llvm::Value *Size = llvm::ConstantInt::get(IntPtrTy, TySize);
716 if (ArraySize)
717 Size = Builder.CreateMul(Size, ArraySize);
718
719 // Degenerate case: new X[0] does not need an objectsize check.
720 llvm::Constant *ConstantSize = dyn_cast<llvm::Constant>(Size);
721 if (!ConstantSize || !ConstantSize->isNullValue()) {
722 // The glvalue must refer to a large enough storage region.
723 // FIXME: If Address Sanitizer is enabled, insert dynamic instrumentation
724 // to check this.
725 // FIXME: Get object address space
726 llvm::Type *Tys[2] = { IntPtrTy, Int8PtrTy };
727 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::objectsize, Tys);
728 llvm::Value *Min = Builder.getFalse();
729 llvm::Value *NullIsUnknown = Builder.getFalse();
730 llvm::Value *Dynamic = Builder.getFalse();
731 llvm::Value *CastAddr = Builder.CreateBitCast(Ptr, Int8PtrTy);
732 llvm::Value *LargeEnough = Builder.CreateICmpUGE(
733 Builder.CreateCall(F, {CastAddr, Min, NullIsUnknown, Dynamic}), Size);
734 Checks.push_back(std::make_pair(LargeEnough, SanitizerKind::ObjectSize));
735 }
736 }
737
738 uint64_t AlignVal = 0;
739 llvm::Value *PtrAsInt = nullptr;
740
741 if (SanOpts.has(SanitizerKind::Alignment) &&
742 !SkippedChecks.has(SanitizerKind::Alignment)) {
743 AlignVal = Alignment.getQuantity();
744 if (!Ty->isIncompleteType() && !AlignVal)
745 AlignVal = getContext().getTypeAlignInChars(Ty).getQuantity();
746
747 // The glvalue must be suitably aligned.
748 if (AlignVal > 1 &&
749 (!PtrToAlloca || PtrToAlloca->getAlignment() < AlignVal)) {
750 PtrAsInt = Builder.CreatePtrToInt(Ptr, IntPtrTy);
751 llvm::Value *Align = Builder.CreateAnd(
752 PtrAsInt, llvm::ConstantInt::get(IntPtrTy, AlignVal - 1));
753 llvm::Value *Aligned =
754 Builder.CreateICmpEQ(Align, llvm::ConstantInt::get(IntPtrTy, 0));
755 if (Aligned != True)
756 Checks.push_back(std::make_pair(Aligned, SanitizerKind::Alignment));
757 }
758 }
759
760 if (Checks.size() > 0) {
761 // Make sure we're not losing information. Alignment needs to be a power of
762 // 2
763 assert(!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal)((!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) ==
AlignVal) ? static_cast<void> (0) : __assert_fail ("!AlignVal || (uint64_t)1 << llvm::Log2_64(AlignVal) == AlignVal"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 763, __PRETTY_FUNCTION__))
;
764 llvm::Constant *StaticData[] = {
765 EmitCheckSourceLocation(Loc), EmitCheckTypeDescriptor(Ty),
766 llvm::ConstantInt::get(Int8Ty, AlignVal ? llvm::Log2_64(AlignVal) : 1),
767 llvm::ConstantInt::get(Int8Ty, TCK)};
768 EmitCheck(Checks, SanitizerHandler::TypeMismatch, StaticData,
769 PtrAsInt ? PtrAsInt : Ptr);
770 }
771
772 // If possible, check that the vptr indicates that there is a subobject of
773 // type Ty at offset zero within this object.
774 //
775 // C++11 [basic.life]p5,6:
776 // [For storage which does not refer to an object within its lifetime]
777 // The program has undefined behavior if:
778 // -- the [pointer or glvalue] is used to access a non-static data member
779 // or call a non-static member function
780 if (SanOpts.has(SanitizerKind::Vptr) &&
781 !SkippedChecks.has(SanitizerKind::Vptr) && isVptrCheckRequired(TCK, Ty)) {
782 // Ensure that the pointer is non-null before loading it. If there is no
783 // compile-time guarantee, reuse the run-time null check or emit a new one.
784 if (!IsGuaranteedNonNull) {
785 if (!IsNonNull)
786 IsNonNull = Builder.CreateIsNotNull(Ptr);
787 if (!Done)
788 Done = createBasicBlock("vptr.null");
789 llvm::BasicBlock *VptrNotNull = createBasicBlock("vptr.not.null");
790 Builder.CreateCondBr(IsNonNull, VptrNotNull, Done);
791 EmitBlock(VptrNotNull);
792 }
793
794 // Compute a hash of the mangled name of the type.
795 //
796 // FIXME: This is not guaranteed to be deterministic! Move to a
797 // fingerprinting mechanism once LLVM provides one. For the time
798 // being the implementation happens to be deterministic.
799 SmallString<64> MangledName;
800 llvm::raw_svector_ostream Out(MangledName);
801 CGM.getCXXABI().getMangleContext().mangleCXXRTTI(Ty.getUnqualifiedType(),
802 Out);
803
804 // Blacklist based on the mangled type.
805 if (!CGM.getContext().getSanitizerBlacklist().isBlacklistedType(
806 SanitizerKind::Vptr, Out.str())) {
807 llvm::hash_code TypeHash = hash_value(Out.str());
808
809 // Load the vptr, and compute hash_16_bytes(TypeHash, vptr).
810 llvm::Value *Low = llvm::ConstantInt::get(Int64Ty, TypeHash);
811 llvm::Type *VPtrTy = llvm::PointerType::get(IntPtrTy, 0);
812 Address VPtrAddr(Builder.CreateBitCast(Ptr, VPtrTy), getPointerAlign());
813 llvm::Value *VPtrVal = Builder.CreateLoad(VPtrAddr);
814 llvm::Value *High = Builder.CreateZExt(VPtrVal, Int64Ty);
815
816 llvm::Value *Hash = emitHash16Bytes(Builder, Low, High);
817 Hash = Builder.CreateTrunc(Hash, IntPtrTy);
818
819 // Look the hash up in our cache.
820 const int CacheSize = 128;
821 llvm::Type *HashTable = llvm::ArrayType::get(IntPtrTy, CacheSize);
822 llvm::Value *Cache = CGM.CreateRuntimeVariable(HashTable,
823 "__ubsan_vptr_type_cache");
824 llvm::Value *Slot = Builder.CreateAnd(Hash,
825 llvm::ConstantInt::get(IntPtrTy,
826 CacheSize-1));
827 llvm::Value *Indices[] = { Builder.getInt32(0), Slot };
828 llvm::Value *CacheVal =
829 Builder.CreateAlignedLoad(Builder.CreateInBoundsGEP(Cache, Indices),
830 getPointerAlign());
831
832 // If the hash isn't in the cache, call a runtime handler to perform the
833 // hard work of checking whether the vptr is for an object of the right
834 // type. This will either fill in the cache and return, or produce a
835 // diagnostic.
836 llvm::Value *EqualHash = Builder.CreateICmpEQ(CacheVal, Hash);
837 llvm::Constant *StaticData[] = {
838 EmitCheckSourceLocation(Loc),
839 EmitCheckTypeDescriptor(Ty),
840 CGM.GetAddrOfRTTIDescriptor(Ty.getUnqualifiedType()),
841 llvm::ConstantInt::get(Int8Ty, TCK)
842 };
843 llvm::Value *DynamicData[] = { Ptr, Hash };
844 EmitCheck(std::make_pair(EqualHash, SanitizerKind::Vptr),
845 SanitizerHandler::DynamicTypeCacheMiss, StaticData,
846 DynamicData);
847 }
848 }
849
850 if (Done) {
851 Builder.CreateBr(Done);
852 EmitBlock(Done);
853 }
854}
855
856/// Determine whether this expression refers to a flexible array member in a
857/// struct. We disable array bounds checks for such members.
858static bool isFlexibleArrayMemberExpr(const Expr *E) {
859 // For compatibility with existing code, we treat arrays of length 0 or
860 // 1 as flexible array members.
861 const ArrayType *AT = E->getType()->castAsArrayTypeUnsafe();
862 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) {
863 if (CAT->getSize().ugt(1))
864 return false;
865 } else if (!isa<IncompleteArrayType>(AT))
866 return false;
867
868 E = E->IgnoreParens();
869
870 // A flexible array member must be the last member in the class.
871 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
872 // FIXME: If the base type of the member expr is not FD->getParent(),
873 // this should not be treated as a flexible array member access.
874 if (const auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) {
875 RecordDecl::field_iterator FI(
876 DeclContext::decl_iterator(const_cast<FieldDecl *>(FD)));
877 return ++FI == FD->getParent()->field_end();
878 }
879 } else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(E)) {
880 return IRE->getDecl()->getNextIvar() == nullptr;
881 }
882
883 return false;
884}
885
886llvm::Value *CodeGenFunction::LoadPassedObjectSize(const Expr *E,
887 QualType EltTy) {
888 ASTContext &C = getContext();
889 uint64_t EltSize = C.getTypeSizeInChars(EltTy).getQuantity();
890 if (!EltSize)
891 return nullptr;
892
893 auto *ArrayDeclRef = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts());
894 if (!ArrayDeclRef)
895 return nullptr;
896
897 auto *ParamDecl = dyn_cast<ParmVarDecl>(ArrayDeclRef->getDecl());
898 if (!ParamDecl)
899 return nullptr;
900
901 auto *POSAttr = ParamDecl->getAttr<PassObjectSizeAttr>();
902 if (!POSAttr)
903 return nullptr;
904
905 // Don't load the size if it's a lower bound.
906 int POSType = POSAttr->getType();
907 if (POSType != 0 && POSType != 1)
908 return nullptr;
909
910 // Find the implicit size parameter.
911 auto PassedSizeIt = SizeArguments.find(ParamDecl);
912 if (PassedSizeIt == SizeArguments.end())
913 return nullptr;
914
915 const ImplicitParamDecl *PassedSizeDecl = PassedSizeIt->second;
916 assert(LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable")((LocalDeclMap.count(PassedSizeDecl) && "Passed size not loadable"
) ? static_cast<void> (0) : __assert_fail ("LocalDeclMap.count(PassedSizeDecl) && \"Passed size not loadable\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 916, __PRETTY_FUNCTION__))
;
917 Address AddrOfSize = LocalDeclMap.find(PassedSizeDecl)->second;
918 llvm::Value *SizeInBytes = EmitLoadOfScalar(AddrOfSize, /*Volatile=*/false,
919 C.getSizeType(), E->getExprLoc());
920 llvm::Value *SizeOfElement =
921 llvm::ConstantInt::get(SizeInBytes->getType(), EltSize);
922 return Builder.CreateUDiv(SizeInBytes, SizeOfElement);
923}
924
925/// If Base is known to point to the start of an array, return the length of
926/// that array. Return 0 if the length cannot be determined.
927static llvm::Value *getArrayIndexingBound(
928 CodeGenFunction &CGF, const Expr *Base, QualType &IndexedType) {
929 // For the vector indexing extension, the bound is the number of elements.
930 if (const VectorType *VT = Base->getType()->getAs<VectorType>()) {
931 IndexedType = Base->getType();
932 return CGF.Builder.getInt32(VT->getNumElements());
933 }
934
935 Base = Base->IgnoreParens();
936
937 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
938 if (CE->getCastKind() == CK_ArrayToPointerDecay &&
939 !isFlexibleArrayMemberExpr(CE->getSubExpr())) {
940 IndexedType = CE->getSubExpr()->getType();
941 const ArrayType *AT = IndexedType->castAsArrayTypeUnsafe();
942 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT))
943 return CGF.Builder.getInt(CAT->getSize());
944 else if (const auto *VAT = dyn_cast<VariableArrayType>(AT))
945 return CGF.getVLASize(VAT).NumElts;
946 // Ignore pass_object_size here. It's not applicable on decayed pointers.
947 }
948 }
949
950 QualType EltTy{Base->getType()->getPointeeOrArrayElementType(), 0};
951 if (llvm::Value *POS = CGF.LoadPassedObjectSize(Base, EltTy)) {
952 IndexedType = Base->getType();
953 return POS;
954 }
955
956 return nullptr;
957}
958
959void CodeGenFunction::EmitBoundsCheck(const Expr *E, const Expr *Base,
960 llvm::Value *Index, QualType IndexType,
961 bool Accessed) {
962 assert(SanOpts.has(SanitizerKind::ArrayBounds) &&((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__))
963 "should not be called unless adding bounds checks")((SanOpts.has(SanitizerKind::ArrayBounds) && "should not be called unless adding bounds checks"
) ? static_cast<void> (0) : __assert_fail ("SanOpts.has(SanitizerKind::ArrayBounds) && \"should not be called unless adding bounds checks\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 963, __PRETTY_FUNCTION__))
;
964 SanitizerScope SanScope(this);
965
966 QualType IndexedType;
967 llvm::Value *Bound = getArrayIndexingBound(*this, Base, IndexedType);
968 if (!Bound)
969 return;
970
971 bool IndexSigned = IndexType->isSignedIntegerOrEnumerationType();
972 llvm::Value *IndexVal = Builder.CreateIntCast(Index, SizeTy, IndexSigned);
973 llvm::Value *BoundVal = Builder.CreateIntCast(Bound, SizeTy, false);
974
975 llvm::Constant *StaticData[] = {
976 EmitCheckSourceLocation(E->getExprLoc()),
977 EmitCheckTypeDescriptor(IndexedType),
978 EmitCheckTypeDescriptor(IndexType)
979 };
980 llvm::Value *Check = Accessed ? Builder.CreateICmpULT(IndexVal, BoundVal)
981 : Builder.CreateICmpULE(IndexVal, BoundVal);
982 EmitCheck(std::make_pair(Check, SanitizerKind::ArrayBounds),
983 SanitizerHandler::OutOfBounds, StaticData, Index);
984}
985
986
987CodeGenFunction::ComplexPairTy CodeGenFunction::
988EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV,
989 bool isInc, bool isPre) {
990 ComplexPairTy InVal = EmitLoadOfComplex(LV, E->getExprLoc());
991
992 llvm::Value *NextVal;
993 if (isa<llvm::IntegerType>(InVal.first->getType())) {
994 uint64_t AmountVal = isInc ? 1 : -1;
995 NextVal = llvm::ConstantInt::get(InVal.first->getType(), AmountVal, true);
996
997 // Add the inc/dec to the real part.
998 NextVal = Builder.CreateAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
999 } else {
1000 QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType();
1001 llvm::APFloat FVal(getContext().getFloatTypeSemantics(ElemTy), 1);
1002 if (!isInc)
1003 FVal.changeSign();
1004 NextVal = llvm::ConstantFP::get(getLLVMContext(), FVal);
1005
1006 // Add the inc/dec to the real part.
1007 NextVal = Builder.CreateFAdd(InVal.first, NextVal, isInc ? "inc" : "dec");
1008 }
1009
1010 ComplexPairTy IncVal(NextVal, InVal.second);
1011
1012 // Store the updated result through the lvalue.
1013 EmitStoreOfComplex(IncVal, LV, /*init*/ false);
1014
1015 // If this is a postinc, return the value read from memory, otherwise use the
1016 // updated value.
1017 return isPre ? IncVal : InVal;
1018}
1019
1020void CodeGenModule::EmitExplicitCastExprType(const ExplicitCastExpr *E,
1021 CodeGenFunction *CGF) {
1022 // Bind VLAs in the cast type.
1023 if (CGF && E->getType()->isVariablyModifiedType())
1024 CGF->EmitVariablyModifiedType(E->getType());
1025
1026 if (CGDebugInfo *DI = getModuleDebugInfo())
1027 DI->EmitExplicitCastType(E->getType());
1028}
1029
1030//===----------------------------------------------------------------------===//
1031// LValue Expression Emission
1032//===----------------------------------------------------------------------===//
1033
1034/// EmitPointerWithAlignment - Given an expression of pointer type, try to
1035/// derive a more accurate bound on the alignment of the pointer.
1036Address CodeGenFunction::EmitPointerWithAlignment(const Expr *E,
1037 LValueBaseInfo *BaseInfo,
1038 TBAAAccessInfo *TBAAInfo) {
1039 // We allow this with ObjC object pointers because of fragile ABIs.
1040 assert(E->getType()->isPointerType() ||((E->getType()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__))
1041 E->getType()->isObjCObjectPointerType())((E->getType()->isPointerType() || E->getType()->
isObjCObjectPointerType()) ? static_cast<void> (0) : __assert_fail
("E->getType()->isPointerType() || E->getType()->isObjCObjectPointerType()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1041, __PRETTY_FUNCTION__))
;
1042 E = E->IgnoreParens();
1043
1044 // Casts:
1045 if (const CastExpr *CE = dyn_cast<CastExpr>(E)) {
1046 if (const auto *ECE = dyn_cast<ExplicitCastExpr>(CE))
1047 CGM.EmitExplicitCastExprType(ECE, this);
1048
1049 switch (CE->getCastKind()) {
1050 // Non-converting casts (but not C's implicit conversion from void*).
1051 case CK_BitCast:
1052 case CK_NoOp:
1053 case CK_AddressSpaceConversion:
1054 if (auto PtrTy = CE->getSubExpr()->getType()->getAs<PointerType>()) {
1055 if (PtrTy->getPointeeType()->isVoidType())
1056 break;
1057
1058 LValueBaseInfo InnerBaseInfo;
1059 TBAAAccessInfo InnerTBAAInfo;
1060 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(),
1061 &InnerBaseInfo,
1062 &InnerTBAAInfo);
1063 if (BaseInfo) *BaseInfo = InnerBaseInfo;
1064 if (TBAAInfo) *TBAAInfo = InnerTBAAInfo;
1065
1066 if (isa<ExplicitCastExpr>(CE)) {
1067 LValueBaseInfo TargetTypeBaseInfo;
1068 TBAAAccessInfo TargetTypeTBAAInfo;
1069 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(),
1070 &TargetTypeBaseInfo,
1071 &TargetTypeTBAAInfo);
1072 if (TBAAInfo)
1073 *TBAAInfo = CGM.mergeTBAAInfoForCast(*TBAAInfo,
1074 TargetTypeTBAAInfo);
1075 // If the source l-value is opaque, honor the alignment of the
1076 // casted-to type.
1077 if (InnerBaseInfo.getAlignmentSource() != AlignmentSource::Decl) {
1078 if (BaseInfo)
1079 BaseInfo->mergeForCast(TargetTypeBaseInfo);
1080 Addr = Address(Addr.getPointer(), Align);
1081 }
1082 }
1083
1084 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast) &&
1085 CE->getCastKind() == CK_BitCast) {
1086 if (auto PT = E->getType()->getAs<PointerType>())
1087 EmitVTablePtrCheckForCast(PT->getPointeeType(), Addr.getPointer(),
1088 /*MayBeNull=*/true,
1089 CodeGenFunction::CFITCK_UnrelatedCast,
1090 CE->getBeginLoc());
1091 }
1092 return CE->getCastKind() != CK_AddressSpaceConversion
1093 ? Builder.CreateBitCast(Addr, ConvertType(E->getType()))
1094 : Builder.CreateAddrSpaceCast(Addr,
1095 ConvertType(E->getType()));
1096 }
1097 break;
1098
1099 // Array-to-pointer decay.
1100 case CK_ArrayToPointerDecay:
1101 return EmitArrayToPointerDecay(CE->getSubExpr(), BaseInfo, TBAAInfo);
1102
1103 // Derived-to-base conversions.
1104 case CK_UncheckedDerivedToBase:
1105 case CK_DerivedToBase: {
1106 // TODO: Support accesses to members of base classes in TBAA. For now, we
1107 // conservatively pretend that the complete object is of the base class
1108 // type.
1109 if (TBAAInfo)
1110 *TBAAInfo = CGM.getTBAAAccessInfo(E->getType());
1111 Address Addr = EmitPointerWithAlignment(CE->getSubExpr(), BaseInfo);
1112 auto Derived = CE->getSubExpr()->getType()->getPointeeCXXRecordDecl();
1113 return GetAddressOfBaseClass(Addr, Derived,
1114 CE->path_begin(), CE->path_end(),
1115 ShouldNullCheckClassCastValue(CE),
1116 CE->getExprLoc());
1117 }
1118
1119 // TODO: Is there any reason to treat base-to-derived conversions
1120 // specially?
1121 default:
1122 break;
1123 }
1124 }
1125
1126 // Unary &.
1127 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
1128 if (UO->getOpcode() == UO_AddrOf) {
1129 LValue LV = EmitLValue(UO->getSubExpr());
1130 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
1131 if (TBAAInfo) *TBAAInfo = LV.getTBAAInfo();
1132 return LV.getAddress();
1133 }
1134 }
1135
1136 // TODO: conditional operators, comma.
1137
1138 // Otherwise, use the alignment of the type.
1139 CharUnits Align = getNaturalPointeeTypeAlignment(E->getType(), BaseInfo,
1140 TBAAInfo);
1141 return Address(EmitScalarExpr(E), Align);
1142}
1143
1144RValue CodeGenFunction::GetUndefRValue(QualType Ty) {
1145 if (Ty->isVoidType())
1146 return RValue::get(nullptr);
1147
1148 switch (getEvaluationKind(Ty)) {
1149 case TEK_Complex: {
1150 llvm::Type *EltTy =
1151 ConvertType(Ty->castAs<ComplexType>()->getElementType());
1152 llvm::Value *U = llvm::UndefValue::get(EltTy);
1153 return RValue::getComplex(std::make_pair(U, U));
1154 }
1155
1156 // If this is a use of an undefined aggregate type, the aggregate must have an
1157 // identifiable address. Just because the contents of the value are undefined
1158 // doesn't mean that the address can't be taken and compared.
1159 case TEK_Aggregate: {
1160 Address DestPtr = CreateMemTemp(Ty, "undef.agg.tmp");
1161 return RValue::getAggregate(DestPtr);
1162 }
1163
1164 case TEK_Scalar:
1165 return RValue::get(llvm::UndefValue::get(ConvertType(Ty)));
1166 }
1167 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1167)
;
1168}
1169
1170RValue CodeGenFunction::EmitUnsupportedRValue(const Expr *E,
1171 const char *Name) {
1172 ErrorUnsupported(E, Name);
1173 return GetUndefRValue(E->getType());
1174}
1175
1176LValue CodeGenFunction::EmitUnsupportedLValue(const Expr *E,
1177 const char *Name) {
1178 ErrorUnsupported(E, Name);
1179 llvm::Type *Ty = llvm::PointerType::getUnqual(ConvertType(E->getType()));
1180 return MakeAddrLValue(Address(llvm::UndefValue::get(Ty), CharUnits::One()),
1181 E->getType());
1182}
1183
1184bool CodeGenFunction::IsWrappedCXXThis(const Expr *Obj) {
1185 const Expr *Base = Obj;
1186 while (!isa<CXXThisExpr>(Base)) {
1187 // The result of a dynamic_cast can be null.
1188 if (isa<CXXDynamicCastExpr>(Base))
1189 return false;
1190
1191 if (const auto *CE = dyn_cast<CastExpr>(Base)) {
1192 Base = CE->getSubExpr();
1193 } else if (const auto *PE = dyn_cast<ParenExpr>(Base)) {
1194 Base = PE->getSubExpr();
1195 } else if (const auto *UO = dyn_cast<UnaryOperator>(Base)) {
1196 if (UO->getOpcode() == UO_Extension)
1197 Base = UO->getSubExpr();
1198 else
1199 return false;
1200 } else {
1201 return false;
1202 }
1203 }
1204 return true;
1205}
1206
1207LValue CodeGenFunction::EmitCheckedLValue(const Expr *E, TypeCheckKind TCK) {
1208 LValue LV;
1209 if (SanOpts.has(SanitizerKind::ArrayBounds) && isa<ArraySubscriptExpr>(E))
1210 LV = EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E), /*Accessed*/true);
1211 else
1212 LV = EmitLValue(E);
1213 if (!isa<DeclRefExpr>(E) && !LV.isBitField() && LV.isSimple()) {
1214 SanitizerSet SkippedChecks;
1215 if (const auto *ME = dyn_cast<MemberExpr>(E)) {
1216 bool IsBaseCXXThis = IsWrappedCXXThis(ME->getBase());
1217 if (IsBaseCXXThis)
1218 SkippedChecks.set(SanitizerKind::Alignment, true);
1219 if (IsBaseCXXThis || isa<DeclRefExpr>(ME->getBase()))
1220 SkippedChecks.set(SanitizerKind::Null, true);
1221 }
1222 EmitTypeCheck(TCK, E->getExprLoc(), LV.getPointer(),
1223 E->getType(), LV.getAlignment(), SkippedChecks);
1224 }
1225 return LV;
1226}
1227
1228/// EmitLValue - Emit code to compute a designator that specifies the location
1229/// of the expression.
1230///
1231/// This can return one of two things: a simple address or a bitfield reference.
1232/// In either case, the LLVM Value* in the LValue structure is guaranteed to be
1233/// an LLVM pointer type.
1234///
1235/// If this returns a bitfield reference, nothing about the pointee type of the
1236/// LLVM value is known: For example, it may not be a pointer to an integer.
1237///
1238/// If this returns a normal address, and if the lvalue's C type is fixed size,
1239/// this method guarantees that the returned pointer type will point to an LLVM
1240/// type of the same size of the lvalue's type. If the lvalue has a variable
1241/// length type, this is not possible.
1242///
1243LValue CodeGenFunction::EmitLValue(const Expr *E) {
1244 ApplyDebugLocation DL(*this, E);
1245 switch (E->getStmtClass()) {
11
Control jumps to 'case SubstNonTypeTemplateParmExprClass:' at line 1357
14
Control jumps to 'case ImplicitCastExprClass:' at line 1359
1246 default: return EmitUnsupportedLValue(E, "l-value expression");
1247
1248 case Expr::ObjCPropertyRefExprClass:
1249 llvm_unreachable("cannot emit a property reference directly")::llvm::llvm_unreachable_internal("cannot emit a property reference directly"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1249)
;
1250
1251 case Expr::ObjCSelectorExprClass:
1252 return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
1253 case Expr::ObjCIsaExprClass:
1254 return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
1255 case Expr::BinaryOperatorClass:
1256 return EmitBinaryOperatorLValue(cast<BinaryOperator>(E));
1257 case Expr::CompoundAssignOperatorClass: {
1258 QualType Ty = E->getType();
1259 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1260 Ty = AT->getValueType();
1261 if (!Ty->isAnyComplexType())
1262 return EmitCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1263 return EmitComplexCompoundAssignmentLValue(cast<CompoundAssignOperator>(E));
1264 }
1265 case Expr::CallExprClass:
1266 case Expr::CXXMemberCallExprClass:
1267 case Expr::CXXOperatorCallExprClass:
1268 case Expr::UserDefinedLiteralClass:
1269 return EmitCallExprLValue(cast<CallExpr>(E));
1270 case Expr::VAArgExprClass:
1271 return EmitVAArgExprLValue(cast<VAArgExpr>(E));
1272 case Expr::DeclRefExprClass:
1273 return EmitDeclRefLValue(cast<DeclRefExpr>(E));
1274 case Expr::ConstantExprClass:
1275 return EmitLValue(cast<ConstantExpr>(E)->getSubExpr());
1276 case Expr::ParenExprClass:
1277 return EmitLValue(cast<ParenExpr>(E)->getSubExpr());
1278 case Expr::GenericSelectionExprClass:
1279 return EmitLValue(cast<GenericSelectionExpr>(E)->getResultExpr());
1280 case Expr::PredefinedExprClass:
1281 return EmitPredefinedLValue(cast<PredefinedExpr>(E));
1282 case Expr::StringLiteralClass:
1283 return EmitStringLiteralLValue(cast<StringLiteral>(E));
1284 case Expr::ObjCEncodeExprClass:
1285 return EmitObjCEncodeExprLValue(cast<ObjCEncodeExpr>(E));
1286 case Expr::PseudoObjectExprClass:
1287 return EmitPseudoObjectLValue(cast<PseudoObjectExpr>(E));
1288 case Expr::InitListExprClass:
1289 return EmitInitListLValue(cast<InitListExpr>(E));
1290 case Expr::CXXTemporaryObjectExprClass:
1291 case Expr::CXXConstructExprClass:
1292 return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
1293 case Expr::CXXBindTemporaryExprClass:
1294 return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
1295 case Expr::CXXUuidofExprClass:
1296 return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
1297 case Expr::LambdaExprClass:
1298 return EmitAggExprToLValue(E);
1299
1300 case Expr::ExprWithCleanupsClass: {
1301 const auto *cleanups = cast<ExprWithCleanups>(E);
1302 enterFullExpression(cleanups);
1303 RunCleanupsScope Scope(*this);
1304 LValue LV = EmitLValue(cleanups->getSubExpr());
1305 if (LV.isSimple()) {
1306 // Defend against branches out of gnu statement expressions surrounded by
1307 // cleanups.
1308 llvm::Value *V = LV.getPointer();
1309 Scope.ForceCleanup({&V});
1310 return LValue::MakeAddr(Address(V, LV.getAlignment()), LV.getType(),
1311 getContext(), LV.getBaseInfo(), LV.getTBAAInfo());
1312 }
1313 // FIXME: Is it possible to create an ExprWithCleanups that produces a
1314 // bitfield lvalue or some other non-simple lvalue?
1315 return LV;
1316 }
1317
1318 case Expr::CXXDefaultArgExprClass: {
1319 auto *DAE = cast<CXXDefaultArgExpr>(E);
1320 CXXDefaultArgExprScope Scope(*this, DAE);
1321 return EmitLValue(DAE->getExpr());
1322 }
1323 case Expr::CXXDefaultInitExprClass: {
1324 auto *DIE = cast<CXXDefaultInitExpr>(E);
1325 CXXDefaultInitExprScope Scope(*this, DIE);
1326 return EmitLValue(DIE->getExpr());
1327 }
1328 case Expr::CXXTypeidExprClass:
1329 return EmitCXXTypeidLValue(cast<CXXTypeidExpr>(E));
1330
1331 case Expr::ObjCMessageExprClass:
1332 return EmitObjCMessageExprLValue(cast<ObjCMessageExpr>(E));
1333 case Expr::ObjCIvarRefExprClass:
1334 return EmitObjCIvarRefLValue(cast<ObjCIvarRefExpr>(E));
1335 case Expr::StmtExprClass:
1336 return EmitStmtExprLValue(cast<StmtExpr>(E));
1337 case Expr::UnaryOperatorClass:
1338 return EmitUnaryOpLValue(cast<UnaryOperator>(E));
1339 case Expr::ArraySubscriptExprClass:
1340 return EmitArraySubscriptExpr(cast<ArraySubscriptExpr>(E));
1341 case Expr::OMPArraySectionExprClass:
1342 return EmitOMPArraySectionExpr(cast<OMPArraySectionExpr>(E));
1343 case Expr::ExtVectorElementExprClass:
1344 return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
1345 case Expr::MemberExprClass:
1346 return EmitMemberExpr(cast<MemberExpr>(E));
1347 case Expr::CompoundLiteralExprClass:
1348 return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
1349 case Expr::ConditionalOperatorClass:
1350 return EmitConditionalOperatorLValue(cast<ConditionalOperator>(E));
1351 case Expr::BinaryConditionalOperatorClass:
1352 return EmitConditionalOperatorLValue(cast<BinaryConditionalOperator>(E));
1353 case Expr::ChooseExprClass:
1354 return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr());
1355 case Expr::OpaqueValueExprClass:
1356 return EmitOpaqueValueLValue(cast<OpaqueValueExpr>(E));
1357 case Expr::SubstNonTypeTemplateParmExprClass:
1358 return EmitLValue(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement());
12
'E' is a 'SubstNonTypeTemplateParmExpr'
13
Calling 'CodeGenFunction::EmitLValue'
1359 case Expr::ImplicitCastExprClass:
1360 case Expr::CStyleCastExprClass:
1361 case Expr::CXXFunctionalCastExprClass:
1362 case Expr::CXXStaticCastExprClass:
1363 case Expr::CXXDynamicCastExprClass:
1364 case Expr::CXXReinterpretCastExprClass:
1365 case Expr::CXXConstCastExprClass:
1366 case Expr::ObjCBridgedCastExprClass:
1367 return EmitCastLValue(cast<CastExpr>(E));
15
'E' is a 'CastExpr'
16
Calling 'CodeGenFunction::EmitCastLValue'
1368
1369 case Expr::MaterializeTemporaryExprClass:
1370 return EmitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(E));
1371
1372 case Expr::CoawaitExprClass:
1373 return EmitCoawaitLValue(cast<CoawaitExpr>(E));
1374 case Expr::CoyieldExprClass:
1375 return EmitCoyieldLValue(cast<CoyieldExpr>(E));
1376 }
1377}
1378
1379/// Given an object of the given canonical type, can we safely copy a
1380/// value out of it based on its initializer?
1381static bool isConstantEmittableObjectType(QualType type) {
1382 assert(type.isCanonical())((type.isCanonical()) ? static_cast<void> (0) : __assert_fail
("type.isCanonical()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1382, __PRETTY_FUNCTION__))
;
1383 assert(!type->isReferenceType())((!type->isReferenceType()) ? static_cast<void> (0) :
__assert_fail ("!type->isReferenceType()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1383, __PRETTY_FUNCTION__))
;
1384
1385 // Must be const-qualified but non-volatile.
1386 Qualifiers qs = type.getLocalQualifiers();
1387 if (!qs.hasConst() || qs.hasVolatile()) return false;
1388
1389 // Otherwise, all object types satisfy this except C++ classes with
1390 // mutable subobjects or non-trivial copy/destroy behavior.
1391 if (const auto *RT = dyn_cast<RecordType>(type))
1392 if (const auto *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
1393 if (RD->hasMutableFields() || !RD->isTrivial())
1394 return false;
1395
1396 return true;
1397}
1398
1399/// Can we constant-emit a load of a reference to a variable of the
1400/// given type? This is different from predicates like
1401/// Decl::mightBeUsableInConstantExpressions because we do want it to apply
1402/// in situations that don't necessarily satisfy the language's rules
1403/// for this (e.g. C++'s ODR-use rules). For example, we want to able
1404/// to do this with const float variables even if those variables
1405/// aren't marked 'constexpr'.
1406enum ConstantEmissionKind {
1407 CEK_None,
1408 CEK_AsReferenceOnly,
1409 CEK_AsValueOrReference,
1410 CEK_AsValueOnly
1411};
1412static ConstantEmissionKind checkVarTypeForConstantEmission(QualType type) {
1413 type = type.getCanonicalType();
1414 if (const auto *ref = dyn_cast<ReferenceType>(type)) {
1415 if (isConstantEmittableObjectType(ref->getPointeeType()))
1416 return CEK_AsValueOrReference;
1417 return CEK_AsReferenceOnly;
1418 }
1419 if (isConstantEmittableObjectType(type))
1420 return CEK_AsValueOnly;
1421 return CEK_None;
1422}
1423
1424/// Try to emit a reference to the given value without producing it as
1425/// an l-value. This is just an optimization, but it avoids us needing
1426/// to emit global copies of variables if they're named without triggering
1427/// a formal use in a context where we can't emit a direct reference to them,
1428/// for instance if a block or lambda or a member of a local class uses a
1429/// const int variable or constexpr variable from an enclosing function.
1430CodeGenFunction::ConstantEmission
1431CodeGenFunction::tryEmitAsConstant(DeclRefExpr *refExpr) {
1432 ValueDecl *value = refExpr->getDecl();
1433
1434 // The value needs to be an enum constant or a constant variable.
1435 ConstantEmissionKind CEK;
1436 if (isa<ParmVarDecl>(value)) {
1437 CEK = CEK_None;
1438 } else if (auto *var = dyn_cast<VarDecl>(value)) {
1439 CEK = checkVarTypeForConstantEmission(var->getType());
1440 } else if (isa<EnumConstantDecl>(value)) {
1441 CEK = CEK_AsValueOnly;
1442 } else {
1443 CEK = CEK_None;
1444 }
1445 if (CEK == CEK_None) return ConstantEmission();
1446
1447 Expr::EvalResult result;
1448 bool resultIsReference;
1449 QualType resultType;
1450
1451 // It's best to evaluate all the way as an r-value if that's permitted.
1452 if (CEK != CEK_AsReferenceOnly &&
1453 refExpr->EvaluateAsRValue(result, getContext())) {
1454 resultIsReference = false;
1455 resultType = refExpr->getType();
1456
1457 // Otherwise, try to evaluate as an l-value.
1458 } else if (CEK != CEK_AsValueOnly &&
1459 refExpr->EvaluateAsLValue(result, getContext())) {
1460 resultIsReference = true;
1461 resultType = value->getType();
1462
1463 // Failure.
1464 } else {
1465 return ConstantEmission();
1466 }
1467
1468 // In any case, if the initializer has side-effects, abandon ship.
1469 if (result.HasSideEffects)
1470 return ConstantEmission();
1471
1472 // Emit as a constant.
1473 auto C = ConstantEmitter(*this).emitAbstract(refExpr->getLocation(),
1474 result.Val, resultType);
1475
1476 // Make sure we emit a debug reference to the global variable.
1477 // This should probably fire even for
1478 if (isa<VarDecl>(value)) {
1479 if (!getContext().DeclMustBeEmitted(cast<VarDecl>(value)))
1480 EmitDeclRefExprDbgValue(refExpr, result.Val);
1481 } else {
1482 assert(isa<EnumConstantDecl>(value))((isa<EnumConstantDecl>(value)) ? static_cast<void>
(0) : __assert_fail ("isa<EnumConstantDecl>(value)", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1482, __PRETTY_FUNCTION__))
;
1483 EmitDeclRefExprDbgValue(refExpr, result.Val);
1484 }
1485
1486 // If we emitted a reference constant, we need to dereference that.
1487 if (resultIsReference)
1488 return ConstantEmission::forReference(C);
1489
1490 return ConstantEmission::forValue(C);
1491}
1492
1493static DeclRefExpr *tryToConvertMemberExprToDeclRefExpr(CodeGenFunction &CGF,
1494 const MemberExpr *ME) {
1495 if (auto *VD = dyn_cast<VarDecl>(ME->getMemberDecl())) {
1496 // Try to emit static variable member expressions as DREs.
1497 return DeclRefExpr::Create(
1498 CGF.getContext(), NestedNameSpecifierLoc(), SourceLocation(), VD,
1499 /*RefersToEnclosingVariableOrCapture=*/false, ME->getExprLoc(),
1500 ME->getType(), ME->getValueKind(), nullptr, nullptr, ME->isNonOdrUse());
1501 }
1502 return nullptr;
1503}
1504
1505CodeGenFunction::ConstantEmission
1506CodeGenFunction::tryEmitAsConstant(const MemberExpr *ME) {
1507 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, ME))
1508 return tryEmitAsConstant(DRE);
1509 return ConstantEmission();
1510}
1511
1512llvm::Value *CodeGenFunction::emitScalarConstant(
1513 const CodeGenFunction::ConstantEmission &Constant, Expr *E) {
1514 assert(Constant && "not a constant")((Constant && "not a constant") ? static_cast<void
> (0) : __assert_fail ("Constant && \"not a constant\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1514, __PRETTY_FUNCTION__))
;
1515 if (Constant.isReference())
1516 return EmitLoadOfLValue(Constant.getReferenceLValue(*this, E),
1517 E->getExprLoc())
1518 .getScalarVal();
1519 return Constant.getValue();
1520}
1521
1522llvm::Value *CodeGenFunction::EmitLoadOfScalar(LValue lvalue,
1523 SourceLocation Loc) {
1524 return EmitLoadOfScalar(lvalue.getAddress(), lvalue.isVolatile(),
1525 lvalue.getType(), Loc, lvalue.getBaseInfo(),
1526 lvalue.getTBAAInfo(), lvalue.isNontemporal());
1527}
1528
1529static bool hasBooleanRepresentation(QualType Ty) {
1530 if (Ty->isBooleanType())
1531 return true;
1532
1533 if (const EnumType *ET = Ty->getAs<EnumType>())
1534 return ET->getDecl()->getIntegerType()->isBooleanType();
1535
1536 if (const AtomicType *AT = Ty->getAs<AtomicType>())
1537 return hasBooleanRepresentation(AT->getValueType());
1538
1539 return false;
1540}
1541
1542static bool getRangeForType(CodeGenFunction &CGF, QualType Ty,
1543 llvm::APInt &Min, llvm::APInt &End,
1544 bool StrictEnums, bool IsBool) {
1545 const EnumType *ET = Ty->getAs<EnumType>();
1546 bool IsRegularCPlusPlusEnum = CGF.getLangOpts().CPlusPlus && StrictEnums &&
1547 ET && !ET->getDecl()->isFixed();
1548 if (!IsBool && !IsRegularCPlusPlusEnum)
1549 return false;
1550
1551 if (IsBool) {
1552 Min = llvm::APInt(CGF.getContext().getTypeSize(Ty), 0);
1553 End = llvm::APInt(CGF.getContext().getTypeSize(Ty), 2);
1554 } else {
1555 const EnumDecl *ED = ET->getDecl();
1556 llvm::Type *LTy = CGF.ConvertTypeForMem(ED->getIntegerType());
1557 unsigned Bitwidth = LTy->getScalarSizeInBits();
1558 unsigned NumNegativeBits = ED->getNumNegativeBits();
1559 unsigned NumPositiveBits = ED->getNumPositiveBits();
1560
1561 if (NumNegativeBits) {
1562 unsigned NumBits = std::max(NumNegativeBits, NumPositiveBits + 1);
1563 assert(NumBits <= Bitwidth)((NumBits <= Bitwidth) ? static_cast<void> (0) : __assert_fail
("NumBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1563, __PRETTY_FUNCTION__))
;
1564 End = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
1565 Min = -End;
1566 } else {
1567 assert(NumPositiveBits <= Bitwidth)((NumPositiveBits <= Bitwidth) ? static_cast<void> (
0) : __assert_fail ("NumPositiveBits <= Bitwidth", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1567, __PRETTY_FUNCTION__))
;
1568 End = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
1569 Min = llvm::APInt(Bitwidth, 0);
1570 }
1571 }
1572 return true;
1573}
1574
1575llvm::MDNode *CodeGenFunction::getRangeForLoadFromType(QualType Ty) {
1576 llvm::APInt Min, End;
1577 if (!getRangeForType(*this, Ty, Min, End, CGM.getCodeGenOpts().StrictEnums,
1578 hasBooleanRepresentation(Ty)))
1579 return nullptr;
1580
1581 llvm::MDBuilder MDHelper(getLLVMContext());
1582 return MDHelper.createRange(Min, End);
1583}
1584
1585bool CodeGenFunction::EmitScalarRangeCheck(llvm::Value *Value, QualType Ty,
1586 SourceLocation Loc) {
1587 bool HasBoolCheck = SanOpts.has(SanitizerKind::Bool);
1588 bool HasEnumCheck = SanOpts.has(SanitizerKind::Enum);
1589 if (!HasBoolCheck && !HasEnumCheck)
1590 return false;
1591
1592 bool IsBool = hasBooleanRepresentation(Ty) ||
1593 NSAPI(CGM.getContext()).isObjCBOOLType(Ty);
1594 bool NeedsBoolCheck = HasBoolCheck && IsBool;
1595 bool NeedsEnumCheck = HasEnumCheck && Ty->getAs<EnumType>();
1596 if (!NeedsBoolCheck && !NeedsEnumCheck)
1597 return false;
1598
1599 // Single-bit booleans don't need to be checked. Special-case this to avoid
1600 // a bit width mismatch when handling bitfield values. This is handled by
1601 // EmitFromMemory for the non-bitfield case.
1602 if (IsBool &&
1603 cast<llvm::IntegerType>(Value->getType())->getBitWidth() == 1)
1604 return false;
1605
1606 llvm::APInt Min, End;
1607 if (!getRangeForType(*this, Ty, Min, End, /*StrictEnums=*/true, IsBool))
1608 return true;
1609
1610 auto &Ctx = getLLVMContext();
1611 SanitizerScope SanScope(this);
1612 llvm::Value *Check;
1613 --End;
1614 if (!Min) {
1615 Check = Builder.CreateICmpULE(Value, llvm::ConstantInt::get(Ctx, End));
1616 } else {
1617 llvm::Value *Upper =
1618 Builder.CreateICmpSLE(Value, llvm::ConstantInt::get(Ctx, End));
1619 llvm::Value *Lower =
1620 Builder.CreateICmpSGE(Value, llvm::ConstantInt::get(Ctx, Min));
1621 Check = Builder.CreateAnd(Upper, Lower);
1622 }
1623 llvm::Constant *StaticArgs[] = {EmitCheckSourceLocation(Loc),
1624 EmitCheckTypeDescriptor(Ty)};
1625 SanitizerMask Kind =
1626 NeedsEnumCheck ? SanitizerKind::Enum : SanitizerKind::Bool;
1627 EmitCheck(std::make_pair(Check, Kind), SanitizerHandler::LoadInvalidValue,
1628 StaticArgs, EmitCheckValue(Value));
1629 return true;
1630}
1631
1632llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
1633 QualType Ty,
1634 SourceLocation Loc,
1635 LValueBaseInfo BaseInfo,
1636 TBAAAccessInfo TBAAInfo,
1637 bool isNontemporal) {
1638 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1639 // For better performance, handle vector loads differently.
1640 if (Ty->isVectorType()) {
1641 const llvm::Type *EltTy = Addr.getElementType();
1642
1643 const auto *VTy = cast<llvm::VectorType>(EltTy);
1644
1645 // Handle vectors of size 3 like size 4 for better performance.
1646 if (VTy->getNumElements() == 3) {
1647
1648 // Bitcast to vec4 type.
1649 llvm::VectorType *vec4Ty =
1650 llvm::VectorType::get(VTy->getElementType(), 4);
1651 Address Cast = Builder.CreateElementBitCast(Addr, vec4Ty, "castToVec4");
1652 // Now load value.
1653 llvm::Value *V = Builder.CreateLoad(Cast, Volatile, "loadVec4");
1654
1655 // Shuffle vector to get vec3.
1656 V = Builder.CreateShuffleVector(V, llvm::UndefValue::get(vec4Ty),
1657 {0, 1, 2}, "extractVec");
1658 return EmitFromMemory(V, Ty);
1659 }
1660 }
1661 }
1662
1663 // Atomic operations have to be done on integral types.
1664 LValue AtomicLValue =
1665 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1666 if (Ty->isAtomicType() || LValueIsSuitableForInlineAtomic(AtomicLValue)) {
1667 return EmitAtomicLoad(AtomicLValue, Loc).getScalarVal();
1668 }
1669
1670 llvm::LoadInst *Load = Builder.CreateLoad(Addr, Volatile);
1671 if (isNontemporal) {
1672 llvm::MDNode *Node = llvm::MDNode::get(
1673 Load->getContext(), llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1674 Load->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1675 }
1676
1677 CGM.DecorateInstructionWithTBAA(Load, TBAAInfo);
1678
1679 if (EmitScalarRangeCheck(Load, Ty, Loc)) {
1680 // In order to prevent the optimizer from throwing away the check, don't
1681 // attach range metadata to the load.
1682 } else if (CGM.getCodeGenOpts().OptimizationLevel > 0)
1683 if (llvm::MDNode *RangeInfo = getRangeForLoadFromType(Ty))
1684 Load->setMetadata(llvm::LLVMContext::MD_range, RangeInfo);
1685
1686 return EmitFromMemory(Load, Ty);
1687}
1688
1689llvm::Value *CodeGenFunction::EmitToMemory(llvm::Value *Value, QualType Ty) {
1690 // Bool has a different representation in memory than in registers.
1691 if (hasBooleanRepresentation(Ty)) {
1692 // This should really always be an i1, but sometimes it's already
1693 // an i8, and it's awkward to track those cases down.
1694 if (Value->getType()->isIntegerTy(1))
1695 return Builder.CreateZExt(Value, ConvertTypeForMem(Ty), "frombool");
1696 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1697, __PRETTY_FUNCTION__))
1697 "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1697, __PRETTY_FUNCTION__))
;
1698 }
1699
1700 return Value;
1701}
1702
1703llvm::Value *CodeGenFunction::EmitFromMemory(llvm::Value *Value, QualType Ty) {
1704 // Bool has a different representation in memory than in registers.
1705 if (hasBooleanRepresentation(Ty)) {
1706 assert(Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) &&((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1707, __PRETTY_FUNCTION__))
1707 "wrong value rep of bool")((Value->getType()->isIntegerTy(getContext().getTypeSize
(Ty)) && "wrong value rep of bool") ? static_cast<
void> (0) : __assert_fail ("Value->getType()->isIntegerTy(getContext().getTypeSize(Ty)) && \"wrong value rep of bool\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1707, __PRETTY_FUNCTION__))
;
1708 return Builder.CreateTrunc(Value, Builder.getInt1Ty(), "tobool");
1709 }
1710
1711 return Value;
1712}
1713
1714void CodeGenFunction::EmitStoreOfScalar(llvm::Value *Value, Address Addr,
1715 bool Volatile, QualType Ty,
1716 LValueBaseInfo BaseInfo,
1717 TBAAAccessInfo TBAAInfo,
1718 bool isInit, bool isNontemporal) {
1719 if (!CGM.getCodeGenOpts().PreserveVec3Type) {
1720 // Handle vectors differently to get better performance.
1721 if (Ty->isVectorType()) {
1722 llvm::Type *SrcTy = Value->getType();
1723 auto *VecTy = dyn_cast<llvm::VectorType>(SrcTy);
1724 // Handle vec3 special.
1725 if (VecTy && VecTy->getNumElements() == 3) {
1726 // Our source is a vec3, do a shuffle vector to make it a vec4.
1727 llvm::Constant *Mask[] = {Builder.getInt32(0), Builder.getInt32(1),
1728 Builder.getInt32(2),
1729 llvm::UndefValue::get(Builder.getInt32Ty())};
1730 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1731 Value = Builder.CreateShuffleVector(Value, llvm::UndefValue::get(VecTy),
1732 MaskV, "extractVec");
1733 SrcTy = llvm::VectorType::get(VecTy->getElementType(), 4);
1734 }
1735 if (Addr.getElementType() != SrcTy) {
1736 Addr = Builder.CreateElementBitCast(Addr, SrcTy, "storetmp");
1737 }
1738 }
1739 }
1740
1741 Value = EmitToMemory(Value, Ty);
1742
1743 LValue AtomicLValue =
1744 LValue::MakeAddr(Addr, Ty, getContext(), BaseInfo, TBAAInfo);
1745 if (Ty->isAtomicType() ||
1746 (!isInit && LValueIsSuitableForInlineAtomic(AtomicLValue))) {
1747 EmitAtomicStore(RValue::get(Value), AtomicLValue, isInit);
1748 return;
1749 }
1750
1751 llvm::StoreInst *Store = Builder.CreateStore(Value, Addr, Volatile);
1752 if (isNontemporal) {
1753 llvm::MDNode *Node =
1754 llvm::MDNode::get(Store->getContext(),
1755 llvm::ConstantAsMetadata::get(Builder.getInt32(1)));
1756 Store->setMetadata(CGM.getModule().getMDKindID("nontemporal"), Node);
1757 }
1758
1759 CGM.DecorateInstructionWithTBAA(Store, TBAAInfo);
1760}
1761
1762void CodeGenFunction::EmitStoreOfScalar(llvm::Value *value, LValue lvalue,
1763 bool isInit) {
1764 EmitStoreOfScalar(value, lvalue.getAddress(), lvalue.isVolatile(),
1765 lvalue.getType(), lvalue.getBaseInfo(),
1766 lvalue.getTBAAInfo(), isInit, lvalue.isNontemporal());
1767}
1768
1769/// EmitLoadOfLValue - Given an expression that represents a value lvalue, this
1770/// method emits the address of the lvalue, then loads the result as an rvalue,
1771/// returning the rvalue.
1772RValue CodeGenFunction::EmitLoadOfLValue(LValue LV, SourceLocation Loc) {
1773 if (LV.isObjCWeak()) {
1774 // load of a __weak object.
1775 Address AddrWeakObj = LV.getAddress();
1776 return RValue::get(CGM.getObjCRuntime().EmitObjCWeakRead(*this,
1777 AddrWeakObj));
1778 }
1779 if (LV.getQuals().getObjCLifetime() == Qualifiers::OCL_Weak) {
1780 // In MRC mode, we do a load+autorelease.
1781 if (!getLangOpts().ObjCAutoRefCount) {
1782 return RValue::get(EmitARCLoadWeak(LV.getAddress()));
1783 }
1784
1785 // In ARC mode, we load retained and then consume the value.
1786 llvm::Value *Object = EmitARCLoadWeakRetained(LV.getAddress());
1787 Object = EmitObjCConsumeObject(LV.getType(), Object);
1788 return RValue::get(Object);
1789 }
1790
1791 if (LV.isSimple()) {
1792 assert(!LV.getType()->isFunctionType())((!LV.getType()->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("!LV.getType()->isFunctionType()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1792, __PRETTY_FUNCTION__))
;
1793
1794 // Everything needs a load.
1795 return RValue::get(EmitLoadOfScalar(LV, Loc));
1796 }
1797
1798 if (LV.isVectorElt()) {
1799 llvm::LoadInst *Load = Builder.CreateLoad(LV.getVectorAddress(),
1800 LV.isVolatileQualified());
1801 return RValue::get(Builder.CreateExtractElement(Load, LV.getVectorIdx(),
1802 "vecext"));
1803 }
1804
1805 // If this is a reference to a subset of the elements of a vector, either
1806 // shuffle the input or extract/insert them as appropriate.
1807 if (LV.isExtVectorElt())
1808 return EmitLoadOfExtVectorElementLValue(LV);
1809
1810 // Global Register variables always invoke intrinsics
1811 if (LV.isGlobalReg())
1812 return EmitLoadOfGlobalRegLValue(LV);
1813
1814 assert(LV.isBitField() && "Unknown LValue type!")((LV.isBitField() && "Unknown LValue type!") ? static_cast
<void> (0) : __assert_fail ("LV.isBitField() && \"Unknown LValue type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1814, __PRETTY_FUNCTION__))
;
1815 return EmitLoadOfBitfieldLValue(LV, Loc);
1816}
1817
1818RValue CodeGenFunction::EmitLoadOfBitfieldLValue(LValue LV,
1819 SourceLocation Loc) {
1820 const CGBitFieldInfo &Info = LV.getBitFieldInfo();
1821
1822 // Get the output type.
1823 llvm::Type *ResLTy = ConvertType(LV.getType());
1824
1825 Address Ptr = LV.getBitFieldAddress();
1826 llvm::Value *Val = Builder.CreateLoad(Ptr, LV.isVolatileQualified(), "bf.load");
1827
1828 if (Info.IsSigned) {
1829 assert(static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize)((static_cast<unsigned>(Info.Offset + Info.Size) <= Info
.StorageSize) ? static_cast<void> (0) : __assert_fail (
"static_cast<unsigned>(Info.Offset + Info.Size) <= Info.StorageSize"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1829, __PRETTY_FUNCTION__))
;
1830 unsigned HighBits = Info.StorageSize - Info.Offset - Info.Size;
1831 if (HighBits)
1832 Val = Builder.CreateShl(Val, HighBits, "bf.shl");
1833 if (Info.Offset + HighBits)
1834 Val = Builder.CreateAShr(Val, Info.Offset + HighBits, "bf.ashr");
1835 } else {
1836 if (Info.Offset)
1837 Val = Builder.CreateLShr(Val, Info.Offset, "bf.lshr");
1838 if (static_cast<unsigned>(Info.Offset) + Info.Size < Info.StorageSize)
1839 Val = Builder.CreateAnd(Val, llvm::APInt::getLowBitsSet(Info.StorageSize,
1840 Info.Size),
1841 "bf.clear");
1842 }
1843 Val = Builder.CreateIntCast(Val, ResLTy, Info.IsSigned, "bf.cast");
1844 EmitScalarRangeCheck(Val, LV.getType(), Loc);
1845 return RValue::get(Val);
1846}
1847
1848// If this is a reference to a subset of the elements of a vector, create an
1849// appropriate shufflevector.
1850RValue CodeGenFunction::EmitLoadOfExtVectorElementLValue(LValue LV) {
1851 llvm::Value *Vec = Builder.CreateLoad(LV.getExtVectorAddress(),
1852 LV.isVolatileQualified());
1853
1854 const llvm::Constant *Elts = LV.getExtVectorElts();
1855
1856 // If the result of the expression is a non-vector type, we must be extracting
1857 // a single element. Just codegen as an extractelement.
1858 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1859 if (!ExprVT) {
1860 unsigned InIdx = getAccessedFieldNo(0, Elts);
1861 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
1862 return RValue::get(Builder.CreateExtractElement(Vec, Elt));
1863 }
1864
1865 // Always use shuffle vector to try to retain the original program structure
1866 unsigned NumResultElts = ExprVT->getNumElements();
1867
1868 SmallVector<llvm::Constant*, 4> Mask;
1869 for (unsigned i = 0; i != NumResultElts; ++i)
1870 Mask.push_back(Builder.getInt32(getAccessedFieldNo(i, Elts)));
1871
1872 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
1873 Vec = Builder.CreateShuffleVector(Vec, llvm::UndefValue::get(Vec->getType()),
1874 MaskV);
1875 return RValue::get(Vec);
1876}
1877
1878/// Generates lvalue for partial ext_vector access.
1879Address CodeGenFunction::EmitExtVectorElementLValue(LValue LV) {
1880 Address VectorAddress = LV.getExtVectorAddress();
1881 const VectorType *ExprVT = LV.getType()->getAs<VectorType>();
1882 QualType EQT = ExprVT->getElementType();
1883 llvm::Type *VectorElementTy = CGM.getTypes().ConvertType(EQT);
1884
1885 Address CastToPointerElement =
1886 Builder.CreateElementBitCast(VectorAddress, VectorElementTy,
1887 "conv.ptr.element");
1888
1889 const llvm::Constant *Elts = LV.getExtVectorElts();
1890 unsigned ix = getAccessedFieldNo(0, Elts);
1891
1892 Address VectorBasePtrPlusIx =
1893 Builder.CreateConstInBoundsGEP(CastToPointerElement, ix,
1894 "vector.elt");
1895
1896 return VectorBasePtrPlusIx;
1897}
1898
1899/// Load of global gamed gegisters are always calls to intrinsics.
1900RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
1901 assert((LV.getType()->isIntegerType() || LV.getType()->isPointerType()) &&(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1902, __PRETTY_FUNCTION__))
1902 "Bad type for register variable")(((LV.getType()->isIntegerType() || LV.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(LV.getType()->isIntegerType() || LV.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1902, __PRETTY_FUNCTION__))
;
1903 llvm::MDNode *RegName = cast<llvm::MDNode>(
1904 cast<llvm::MetadataAsValue>(LV.getGlobalReg())->getMetadata());
1905
1906 // We accept integer and pointer types only
1907 llvm::Type *OrigTy = CGM.getTypes().ConvertType(LV.getType());
1908 llvm::Type *Ty = OrigTy;
1909 if (OrigTy->isPointerTy())
1910 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
1911 llvm::Type *Types[] = { Ty };
1912
1913 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
1914 llvm::Value *Call = Builder.CreateCall(
1915 F, llvm::MetadataAsValue::get(Ty->getContext(), RegName));
1916 if (OrigTy->isPointerTy())
1917 Call = Builder.CreateIntToPtr(Call, OrigTy);
1918 return RValue::get(Call);
1919}
1920
1921
1922/// EmitStoreThroughLValue - Store the specified rvalue into the specified
1923/// lvalue, where both are guaranteed to the have the same type, and that type
1924/// is 'Ty'.
1925void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
1926 bool isInit) {
1927 if (!Dst.isSimple()) {
1928 if (Dst.isVectorElt()) {
1929 // Read/modify/write the vector, inserting the new element.
1930 llvm::Value *Vec = Builder.CreateLoad(Dst.getVectorAddress(),
1931 Dst.isVolatileQualified());
1932 Vec = Builder.CreateInsertElement(Vec, Src.getScalarVal(),
1933 Dst.getVectorIdx(), "vecins");
1934 Builder.CreateStore(Vec, Dst.getVectorAddress(),
1935 Dst.isVolatileQualified());
1936 return;
1937 }
1938
1939 // If this is an update of extended vector elements, insert them as
1940 // appropriate.
1941 if (Dst.isExtVectorElt())
1942 return EmitStoreThroughExtVectorComponentLValue(Src, Dst);
1943
1944 if (Dst.isGlobalReg())
1945 return EmitStoreThroughGlobalRegLValue(Src, Dst);
1946
1947 assert(Dst.isBitField() && "Unknown LValue type")((Dst.isBitField() && "Unknown LValue type") ? static_cast
<void> (0) : __assert_fail ("Dst.isBitField() && \"Unknown LValue type\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1947, __PRETTY_FUNCTION__))
;
1948 return EmitStoreThroughBitfieldLValue(Src, Dst);
1949 }
1950
1951 // There's special magic for assigning into an ARC-qualified l-value.
1952 if (Qualifiers::ObjCLifetime Lifetime = Dst.getQuals().getObjCLifetime()) {
1953 switch (Lifetime) {
1954 case Qualifiers::OCL_None:
1955 llvm_unreachable("present but none")::llvm::llvm_unreachable_internal("present but none", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1955)
;
1956
1957 case Qualifiers::OCL_ExplicitNone:
1958 // nothing special
1959 break;
1960
1961 case Qualifiers::OCL_Strong:
1962 if (isInit) {
1963 Src = RValue::get(EmitARCRetain(Dst.getType(), Src.getScalarVal()));
1964 break;
1965 }
1966 EmitARCStoreStrong(Dst, Src.getScalarVal(), /*ignore*/ true);
1967 return;
1968
1969 case Qualifiers::OCL_Weak:
1970 if (isInit)
1971 // Initialize and then skip the primitive store.
1972 EmitARCInitWeak(Dst.getAddress(), Src.getScalarVal());
1973 else
1974 EmitARCStoreWeak(Dst.getAddress(), Src.getScalarVal(), /*ignore*/ true);
1975 return;
1976
1977 case Qualifiers::OCL_Autoreleasing:
1978 Src = RValue::get(EmitObjCExtendObjectLifetime(Dst.getType(),
1979 Src.getScalarVal()));
1980 // fall into the normal path
1981 break;
1982 }
1983 }
1984
1985 if (Dst.isObjCWeak() && !Dst.isNonGC()) {
1986 // load of a __weak object.
1987 Address LvalueDst = Dst.getAddress();
1988 llvm::Value *src = Src.getScalarVal();
1989 CGM.getObjCRuntime().EmitObjCWeakAssign(*this, src, LvalueDst);
1990 return;
1991 }
1992
1993 if (Dst.isObjCStrong() && !Dst.isNonGC()) {
1994 // load of a __strong object.
1995 Address LvalueDst = Dst.getAddress();
1996 llvm::Value *src = Src.getScalarVal();
1997 if (Dst.isObjCIvar()) {
1998 assert(Dst.getBaseIvarExp() && "BaseIvarExp is NULL")((Dst.getBaseIvarExp() && "BaseIvarExp is NULL") ? static_cast
<void> (0) : __assert_fail ("Dst.getBaseIvarExp() && \"BaseIvarExp is NULL\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 1998, __PRETTY_FUNCTION__))
;
1999 llvm::Type *ResultType = IntPtrTy;
2000 Address dst = EmitPointerWithAlignment(Dst.getBaseIvarExp());
2001 llvm::Value *RHS = dst.getPointer();
2002 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
2003 llvm::Value *LHS =
2004 Builder.CreatePtrToInt(LvalueDst.getPointer(), ResultType,
2005 "sub.ptr.lhs.cast");
2006 llvm::Value *BytesBetween = Builder.CreateSub(LHS, RHS, "ivar.offset");
2007 CGM.getObjCRuntime().EmitObjCIvarAssign(*this, src, dst,
2008 BytesBetween);
2009 } else if (Dst.isGlobalObjCRef()) {
2010 CGM.getObjCRuntime().EmitObjCGlobalAssign(*this, src, LvalueDst,
2011 Dst.isThreadLocalRef());
2012 }
2013 else
2014 CGM.getObjCRuntime().EmitObjCStrongCastAssign(*this, src, LvalueDst);
2015 return;
2016 }
2017
2018 assert(Src.isScalar() && "Can't emit an agg store with this method")((Src.isScalar() && "Can't emit an agg store with this method"
) ? static_cast<void> (0) : __assert_fail ("Src.isScalar() && \"Can't emit an agg store with this method\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2018, __PRETTY_FUNCTION__))
;
2019 EmitStoreOfScalar(Src.getScalarVal(), Dst, isInit);
2020}
2021
2022void CodeGenFunction::EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst,
2023 llvm::Value **Result) {
2024 const CGBitFieldInfo &Info = Dst.getBitFieldInfo();
2025 llvm::Type *ResLTy = ConvertTypeForMem(Dst.getType());
2026 Address Ptr = Dst.getBitFieldAddress();
2027
2028 // Get the source value, truncated to the width of the bit-field.
2029 llvm::Value *SrcVal = Src.getScalarVal();
2030
2031 // Cast the source to the storage type and shift it into place.
2032 SrcVal = Builder.CreateIntCast(SrcVal, Ptr.getElementType(),
2033 /*isSigned=*/false);
2034 llvm::Value *MaskedVal = SrcVal;
2035
2036 // See if there are other bits in the bitfield's storage we'll need to load
2037 // and mask together with source before storing.
2038 if (Info.StorageSize != Info.Size) {
2039 assert(Info.StorageSize > Info.Size && "Invalid bitfield size.")((Info.StorageSize > Info.Size && "Invalid bitfield size."
) ? static_cast<void> (0) : __assert_fail ("Info.StorageSize > Info.Size && \"Invalid bitfield size.\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2039, __PRETTY_FUNCTION__))
;
2040 llvm::Value *Val =
2041 Builder.CreateLoad(Ptr, Dst.isVolatileQualified(), "bf.load");
2042
2043 // Mask the source value as needed.
2044 if (!hasBooleanRepresentation(Dst.getType()))
2045 SrcVal = Builder.CreateAnd(SrcVal,
2046 llvm::APInt::getLowBitsSet(Info.StorageSize,
2047 Info.Size),
2048 "bf.value");
2049 MaskedVal = SrcVal;
2050 if (Info.Offset)
2051 SrcVal = Builder.CreateShl(SrcVal, Info.Offset, "bf.shl");
2052
2053 // Mask out the original value.
2054 Val = Builder.CreateAnd(Val,
2055 ~llvm::APInt::getBitsSet(Info.StorageSize,
2056 Info.Offset,
2057 Info.Offset + Info.Size),
2058 "bf.clear");
2059
2060 // Or together the unchanged values and the source value.
2061 SrcVal = Builder.CreateOr(Val, SrcVal, "bf.set");
2062 } else {
2063 assert(Info.Offset == 0)((Info.Offset == 0) ? static_cast<void> (0) : __assert_fail
("Info.Offset == 0", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2063, __PRETTY_FUNCTION__))
;
2064 }
2065
2066 // Write the new value back out.
2067 Builder.CreateStore(SrcVal, Ptr, Dst.isVolatileQualified());
2068
2069 // Return the new value of the bit-field, if requested.
2070 if (Result) {
2071 llvm::Value *ResultVal = MaskedVal;
2072
2073 // Sign extend the value if needed.
2074 if (Info.IsSigned) {
2075 assert(Info.Size <= Info.StorageSize)((Info.Size <= Info.StorageSize) ? static_cast<void>
(0) : __assert_fail ("Info.Size <= Info.StorageSize", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2075, __PRETTY_FUNCTION__))
;
2076 unsigned HighBits = Info.StorageSize - Info.Size;
2077 if (HighBits) {
2078 ResultVal = Builder.CreateShl(ResultVal, HighBits, "bf.result.shl");
2079 ResultVal = Builder.CreateAShr(ResultVal, HighBits, "bf.result.ashr");
2080 }
2081 }
2082
2083 ResultVal = Builder.CreateIntCast(ResultVal, ResLTy, Info.IsSigned,
2084 "bf.result.cast");
2085 *Result = EmitFromMemory(ResultVal, Dst.getType());
2086 }
2087}
2088
2089void CodeGenFunction::EmitStoreThroughExtVectorComponentLValue(RValue Src,
2090 LValue Dst) {
2091 // This access turns into a read/modify/write of the vector. Load the input
2092 // value now.
2093 llvm::Value *Vec = Builder.CreateLoad(Dst.getExtVectorAddress(),
2094 Dst.isVolatileQualified());
2095 const llvm::Constant *Elts = Dst.getExtVectorElts();
2096
2097 llvm::Value *SrcVal = Src.getScalarVal();
2098
2099 if (const VectorType *VTy = Dst.getType()->getAs<VectorType>()) {
2100 unsigned NumSrcElts = VTy->getNumElements();
2101 unsigned NumDstElts = Vec->getType()->getVectorNumElements();
2102 if (NumDstElts == NumSrcElts) {
2103 // Use shuffle vector is the src and destination are the same number of
2104 // elements and restore the vector mask since it is on the side it will be
2105 // stored.
2106 SmallVector<llvm::Constant*, 4> Mask(NumDstElts);
2107 for (unsigned i = 0; i != NumSrcElts; ++i)
2108 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i);
2109
2110 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2111 Vec = Builder.CreateShuffleVector(SrcVal,
2112 llvm::UndefValue::get(Vec->getType()),
2113 MaskV);
2114 } else if (NumDstElts > NumSrcElts) {
2115 // Extended the source vector to the same length and then shuffle it
2116 // into the destination.
2117 // FIXME: since we're shuffling with undef, can we just use the indices
2118 // into that? This could be simpler.
2119 SmallVector<llvm::Constant*, 4> ExtMask;
2120 for (unsigned i = 0; i != NumSrcElts; ++i)
2121 ExtMask.push_back(Builder.getInt32(i));
2122 ExtMask.resize(NumDstElts, llvm::UndefValue::get(Int32Ty));
2123 llvm::Value *ExtMaskV = llvm::ConstantVector::get(ExtMask);
2124 llvm::Value *ExtSrcVal =
2125 Builder.CreateShuffleVector(SrcVal,
2126 llvm::UndefValue::get(SrcVal->getType()),
2127 ExtMaskV);
2128 // build identity
2129 SmallVector<llvm::Constant*, 4> Mask;
2130 for (unsigned i = 0; i != NumDstElts; ++i)
2131 Mask.push_back(Builder.getInt32(i));
2132
2133 // When the vector size is odd and .odd or .hi is used, the last element
2134 // of the Elts constant array will be one past the size of the vector.
2135 // Ignore the last element here, if it is greater than the mask size.
2136 if (getAccessedFieldNo(NumSrcElts - 1, Elts) == Mask.size())
2137 NumSrcElts--;
2138
2139 // modify when what gets shuffled in
2140 for (unsigned i = 0; i != NumSrcElts; ++i)
2141 Mask[getAccessedFieldNo(i, Elts)] = Builder.getInt32(i+NumDstElts);
2142 llvm::Value *MaskV = llvm::ConstantVector::get(Mask);
2143 Vec = Builder.CreateShuffleVector(Vec, ExtSrcVal, MaskV);
2144 } else {
2145 // We should never shorten the vector
2146 llvm_unreachable("unexpected shorten vector length")::llvm::llvm_unreachable_internal("unexpected shorten vector length"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2146)
;
2147 }
2148 } else {
2149 // If the Src is a scalar (not a vector) it must be updating one element.
2150 unsigned InIdx = getAccessedFieldNo(0, Elts);
2151 llvm::Value *Elt = llvm::ConstantInt::get(SizeTy, InIdx);
2152 Vec = Builder.CreateInsertElement(Vec, SrcVal, Elt);
2153 }
2154
2155 Builder.CreateStore(Vec, Dst.getExtVectorAddress(),
2156 Dst.isVolatileQualified());
2157}
2158
2159/// Store of global named registers are always calls to intrinsics.
2160void CodeGenFunction::EmitStoreThroughGlobalRegLValue(RValue Src, LValue Dst) {
2161 assert((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) &&(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2162, __PRETTY_FUNCTION__))
2162 "Bad type for register variable")(((Dst.getType()->isIntegerType() || Dst.getType()->isPointerType
()) && "Bad type for register variable") ? static_cast
<void> (0) : __assert_fail ("(Dst.getType()->isIntegerType() || Dst.getType()->isPointerType()) && \"Bad type for register variable\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2162, __PRETTY_FUNCTION__))
;
2163 llvm::MDNode *RegName = cast<llvm::MDNode>(
2164 cast<llvm::MetadataAsValue>(Dst.getGlobalReg())->getMetadata());
2165 assert(RegName && "Register LValue is not metadata")((RegName && "Register LValue is not metadata") ? static_cast
<void> (0) : __assert_fail ("RegName && \"Register LValue is not metadata\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2165, __PRETTY_FUNCTION__))
;
2166
2167 // We accept integer and pointer types only
2168 llvm::Type *OrigTy = CGM.getTypes().ConvertType(Dst.getType());
2169 llvm::Type *Ty = OrigTy;
2170 if (OrigTy->isPointerTy())
2171 Ty = CGM.getTypes().getDataLayout().getIntPtrType(OrigTy);
2172 llvm::Type *Types[] = { Ty };
2173
2174 llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
2175 llvm::Value *Value = Src.getScalarVal();
2176 if (OrigTy->isPointerTy())
2177 Value = Builder.CreatePtrToInt(Value, Ty);
2178 Builder.CreateCall(
2179 F, {llvm::MetadataAsValue::get(Ty->getContext(), RegName), Value});
2180}
2181
2182// setObjCGCLValueClass - sets class of the lvalue for the purpose of
2183// generating write-barries API. It is currently a global, ivar,
2184// or neither.
2185static void setObjCGCLValueClass(const ASTContext &Ctx, const Expr *E,
2186 LValue &LV,
2187 bool IsMemberAccess=false) {
2188 if (Ctx.getLangOpts().getGC() == LangOptions::NonGC)
2189 return;
2190
2191 if (isa<ObjCIvarRefExpr>(E)) {
2192 QualType ExpTy = E->getType();
2193 if (IsMemberAccess && ExpTy->isPointerType()) {
2194 // If ivar is a structure pointer, assigning to field of
2195 // this struct follows gcc's behavior and makes it a non-ivar
2196 // writer-barrier conservatively.
2197 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2198 if (ExpTy->isRecordType()) {
2199 LV.setObjCIvar(false);
2200 return;
2201 }
2202 }
2203 LV.setObjCIvar(true);
2204 auto *Exp = cast<ObjCIvarRefExpr>(const_cast<Expr *>(E));
2205 LV.setBaseIvarExp(Exp->getBase());
2206 LV.setObjCArray(E->getType()->isArrayType());
2207 return;
2208 }
2209
2210 if (const auto *Exp = dyn_cast<DeclRefExpr>(E)) {
2211 if (const auto *VD = dyn_cast<VarDecl>(Exp->getDecl())) {
2212 if (VD->hasGlobalStorage()) {
2213 LV.setGlobalObjCRef(true);
2214 LV.setThreadLocalRef(VD->getTLSKind() != VarDecl::TLS_None);
2215 }
2216 }
2217 LV.setObjCArray(E->getType()->isArrayType());
2218 return;
2219 }
2220
2221 if (const auto *Exp = dyn_cast<UnaryOperator>(E)) {
2222 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2223 return;
2224 }
2225
2226 if (const auto *Exp = dyn_cast<ParenExpr>(E)) {
2227 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2228 if (LV.isObjCIvar()) {
2229 // If cast is to a structure pointer, follow gcc's behavior and make it
2230 // a non-ivar write-barrier.
2231 QualType ExpTy = E->getType();
2232 if (ExpTy->isPointerType())
2233 ExpTy = ExpTy->castAs<PointerType>()->getPointeeType();
2234 if (ExpTy->isRecordType())
2235 LV.setObjCIvar(false);
2236 }
2237 return;
2238 }
2239
2240 if (const auto *Exp = dyn_cast<GenericSelectionExpr>(E)) {
2241 setObjCGCLValueClass(Ctx, Exp->getResultExpr(), LV);
2242 return;
2243 }
2244
2245 if (const auto *Exp = dyn_cast<ImplicitCastExpr>(E)) {
2246 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2247 return;
2248 }
2249
2250 if (const auto *Exp = dyn_cast<CStyleCastExpr>(E)) {
2251 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2252 return;
2253 }
2254
2255 if (const auto *Exp = dyn_cast<ObjCBridgedCastExpr>(E)) {
2256 setObjCGCLValueClass(Ctx, Exp->getSubExpr(), LV, IsMemberAccess);
2257 return;
2258 }
2259
2260 if (const auto *Exp = dyn_cast<ArraySubscriptExpr>(E)) {
2261 setObjCGCLValueClass(Ctx, Exp->getBase(), LV);
2262 if (LV.isObjCIvar() && !LV.isObjCArray())
2263 // Using array syntax to assigning to what an ivar points to is not
2264 // same as assigning to the ivar itself. {id *Names;} Names[i] = 0;
2265 LV.setObjCIvar(false);
2266 else if (LV.isGlobalObjCRef() && !LV.isObjCArray())
2267 // Using array syntax to assigning to what global points to is not
2268 // same as assigning to the global itself. {id *G;} G[i] = 0;
2269 LV.setGlobalObjCRef(false);
2270 return;
2271 }
2272
2273 if (const auto *Exp = dyn_cast<MemberExpr>(E)) {
2274 setObjCGCLValueClass(Ctx, Exp->getBase(), LV, true);
2275 // We don't know if member is an 'ivar', but this flag is looked at
2276 // only in the context of LV.isObjCIvar().
2277 LV.setObjCArray(E->getType()->isArrayType());
2278 return;
2279 }
2280}
2281
2282static llvm::Value *
2283EmitBitCastOfLValueToProperType(CodeGenFunction &CGF,
2284 llvm::Value *V, llvm::Type *IRType,
2285 StringRef Name = StringRef()) {
2286 unsigned AS = cast<llvm::PointerType>(V->getType())->getAddressSpace();
2287 return CGF.Builder.CreateBitCast(V, IRType->getPointerTo(AS), Name);
2288}
2289
2290static LValue EmitThreadPrivateVarDeclLValue(
2291 CodeGenFunction &CGF, const VarDecl *VD, QualType T, Address Addr,
2292 llvm::Type *RealVarTy, SourceLocation Loc) {
2293 Addr = CGF.CGM.getOpenMPRuntime().getAddrOfThreadPrivate(CGF, VD, Addr, Loc);
2294 Addr = CGF.Builder.CreateElementBitCast(Addr, RealVarTy);
2295 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2296}
2297
2298static Address emitDeclTargetVarDeclLValue(CodeGenFunction &CGF,
2299 const VarDecl *VD, QualType T) {
2300 llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
2301 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
2302 // Return an invalid address if variable is MT_To and unified
2303 // memory is not enabled. For all other cases: MT_Link and
2304 // MT_To with unified memory, return a valid address.
2305 if (!Res || (*Res == OMPDeclareTargetDeclAttr::MT_To &&
2306 !CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory()))
2307 return Address::invalid();
2308 assert(((*Res == OMPDeclareTargetDeclAttr::MT_Link) ||((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2311, __PRETTY_FUNCTION__))
2309 (*Res == OMPDeclareTargetDeclAttr::MT_To &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2311, __PRETTY_FUNCTION__))
2310 CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) &&((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2311, __PRETTY_FUNCTION__))
2311 "Expected link clause OR to clause with unified memory enabled.")((((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr
::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory
())) && "Expected link clause OR to clause with unified memory enabled."
) ? static_cast<void> (0) : __assert_fail ("((*Res == OMPDeclareTargetDeclAttr::MT_Link) || (*Res == OMPDeclareTargetDeclAttr::MT_To && CGF.CGM.getOpenMPRuntime().hasRequiresUnifiedSharedMemory())) && \"Expected link clause OR to clause with unified memory enabled.\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2311, __PRETTY_FUNCTION__))
;
2312 QualType PtrTy = CGF.getContext().getPointerType(VD->getType());
2313 Address Addr = CGF.CGM.getOpenMPRuntime().getAddrOfDeclareTargetVar(VD);
2314 return CGF.EmitLoadOfPointer(Addr, PtrTy->castAs<PointerType>());
2315}
2316
2317Address
2318CodeGenFunction::EmitLoadOfReference(LValue RefLVal,
2319 LValueBaseInfo *PointeeBaseInfo,
2320 TBAAAccessInfo *PointeeTBAAInfo) {
2321 llvm::LoadInst *Load = Builder.CreateLoad(RefLVal.getAddress(),
2322 RefLVal.isVolatile());
2323 CGM.DecorateInstructionWithTBAA(Load, RefLVal.getTBAAInfo());
2324
2325 CharUnits Align = getNaturalTypeAlignment(RefLVal.getType()->getPointeeType(),
2326 PointeeBaseInfo, PointeeTBAAInfo,
2327 /* forPointeeType= */ true);
2328 return Address(Load, Align);
2329}
2330
2331LValue CodeGenFunction::EmitLoadOfReferenceLValue(LValue RefLVal) {
2332 LValueBaseInfo PointeeBaseInfo;
2333 TBAAAccessInfo PointeeTBAAInfo;
2334 Address PointeeAddr = EmitLoadOfReference(RefLVal, &PointeeBaseInfo,
2335 &PointeeTBAAInfo);
2336 return MakeAddrLValue(PointeeAddr, RefLVal.getType()->getPointeeType(),
2337 PointeeBaseInfo, PointeeTBAAInfo);
2338}
2339
2340Address CodeGenFunction::EmitLoadOfPointer(Address Ptr,
2341 const PointerType *PtrTy,
2342 LValueBaseInfo *BaseInfo,
2343 TBAAAccessInfo *TBAAInfo) {
2344 llvm::Value *Addr = Builder.CreateLoad(Ptr);
2345 return Address(Addr, getNaturalTypeAlignment(PtrTy->getPointeeType(),
2346 BaseInfo, TBAAInfo,
2347 /*forPointeeType=*/true));
2348}
2349
2350LValue CodeGenFunction::EmitLoadOfPointerLValue(Address PtrAddr,
2351 const PointerType *PtrTy) {
2352 LValueBaseInfo BaseInfo;
2353 TBAAAccessInfo TBAAInfo;
2354 Address Addr = EmitLoadOfPointer(PtrAddr, PtrTy, &BaseInfo, &TBAAInfo);
2355 return MakeAddrLValue(Addr, PtrTy->getPointeeType(), BaseInfo, TBAAInfo);
2356}
2357
2358static LValue EmitGlobalVarDeclLValue(CodeGenFunction &CGF,
2359 const Expr *E, const VarDecl *VD) {
2360 QualType T = E->getType();
2361
2362 // If it's thread_local, emit a call to its wrapper function instead.
2363 if (VD->getTLSKind() == VarDecl::TLS_Dynamic &&
2364 CGF.CGM.getCXXABI().usesThreadWrapperFunction(VD))
2365 return CGF.CGM.getCXXABI().EmitThreadLocalVarDeclLValue(CGF, VD, T);
2366 // Check if the variable is marked as declare target with link clause in
2367 // device codegen.
2368 if (CGF.getLangOpts().OpenMPIsDevice) {
2369 Address Addr = emitDeclTargetVarDeclLValue(CGF, VD, T);
2370 if (Addr.isValid())
2371 return CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2372 }
2373
2374 llvm::Value *V = CGF.CGM.GetAddrOfGlobalVar(VD);
2375 llvm::Type *RealVarTy = CGF.getTypes().ConvertTypeForMem(VD->getType());
2376 V = EmitBitCastOfLValueToProperType(CGF, V, RealVarTy);
2377 CharUnits Alignment = CGF.getContext().getDeclAlign(VD);
2378 Address Addr(V, Alignment);
2379 // Emit reference to the private copy of the variable if it is an OpenMP
2380 // threadprivate variable.
2381 if (CGF.getLangOpts().OpenMP && !CGF.getLangOpts().OpenMPSimd &&
2382 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2383 return EmitThreadPrivateVarDeclLValue(CGF, VD, T, Addr, RealVarTy,
2384 E->getExprLoc());
2385 }
2386 LValue LV = VD->getType()->isReferenceType() ?
2387 CGF.EmitLoadOfReferenceLValue(Addr, VD->getType(),
2388 AlignmentSource::Decl) :
2389 CGF.MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2390 setObjCGCLValueClass(CGF.getContext(), E, LV);
2391 return LV;
2392}
2393
2394static llvm::Constant *EmitFunctionDeclPointer(CodeGenModule &CGM,
2395 const FunctionDecl *FD) {
2396 if (FD->hasAttr<WeakRefAttr>()) {
2397 ConstantAddress aliasee = CGM.GetWeakRefReference(FD);
2398 return aliasee.getPointer();
2399 }
2400
2401 llvm::Constant *V = CGM.GetAddrOfFunction(FD);
2402 if (!FD->hasPrototype()) {
2403 if (const FunctionProtoType *Proto =
2404 FD->getType()->getAs<FunctionProtoType>()) {
2405 // Ugly case: for a K&R-style definition, the type of the definition
2406 // isn't the same as the type of a use. Correct for this with a
2407 // bitcast.
2408 QualType NoProtoType =
2409 CGM.getContext().getFunctionNoProtoType(Proto->getReturnType());
2410 NoProtoType = CGM.getContext().getPointerType(NoProtoType);
2411 V = llvm::ConstantExpr::getBitCast(V,
2412 CGM.getTypes().ConvertType(NoProtoType));
2413 }
2414 }
2415 return V;
2416}
2417
2418static LValue EmitFunctionDeclLValue(CodeGenFunction &CGF,
2419 const Expr *E, const FunctionDecl *FD) {
2420 llvm::Value *V = EmitFunctionDeclPointer(CGF.CGM, FD);
2421 CharUnits Alignment = CGF.getContext().getDeclAlign(FD);
2422 return CGF.MakeAddrLValue(V, E->getType(), Alignment,
2423 AlignmentSource::Decl);
2424}
2425
2426static LValue EmitCapturedFieldLValue(CodeGenFunction &CGF, const FieldDecl *FD,
2427 llvm::Value *ThisValue) {
2428 QualType TagType = CGF.getContext().getTagDeclType(FD->getParent());
2429 LValue LV = CGF.MakeNaturalAlignAddrLValue(ThisValue, TagType);
2430 return CGF.EmitLValueForField(LV, FD);
2431}
2432
2433/// Named Registers are named metadata pointing to the register name
2434/// which will be read from/written to as an argument to the intrinsic
2435/// @llvm.read/write_register.
2436/// So far, only the name is being passed down, but other options such as
2437/// register type, allocation type or even optimization options could be
2438/// passed down via the metadata node.
2439static LValue EmitGlobalNamedRegister(const VarDecl *VD, CodeGenModule &CGM) {
2440 SmallString<64> Name("llvm.named.register.");
2441 AsmLabelAttr *Asm = VD->getAttr<AsmLabelAttr>();
2442 assert(Asm->getLabel().size() < 64-Name.size() &&((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2443, __PRETTY_FUNCTION__))
2443 "Register name too big")((Asm->getLabel().size() < 64-Name.size() && "Register name too big"
) ? static_cast<void> (0) : __assert_fail ("Asm->getLabel().size() < 64-Name.size() && \"Register name too big\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2443, __PRETTY_FUNCTION__))
;
2444 Name.append(Asm->getLabel());
2445 llvm::NamedMDNode *M =
2446 CGM.getModule().getOrInsertNamedMetadata(Name);
2447 if (M->getNumOperands() == 0) {
2448 llvm::MDString *Str = llvm::MDString::get(CGM.getLLVMContext(),
2449 Asm->getLabel());
2450 llvm::Metadata *Ops[] = {Str};
2451 M->addOperand(llvm::MDNode::get(CGM.getLLVMContext(), Ops));
2452 }
2453
2454 CharUnits Alignment = CGM.getContext().getDeclAlign(VD);
2455
2456 llvm::Value *Ptr =
2457 llvm::MetadataAsValue::get(CGM.getLLVMContext(), M->getOperand(0));
2458 return LValue::MakeGlobalReg(Address(Ptr, Alignment), VD->getType());
2459}
2460
2461/// Determine whether we can emit a reference to \p VD from the current
2462/// context, despite not necessarily having seen an odr-use of the variable in
2463/// this context.
2464static bool canEmitSpuriousReferenceToVariable(CodeGenFunction &CGF,
2465 const DeclRefExpr *E,
2466 const VarDecl *VD,
2467 bool IsConstant) {
2468 // For a variable declared in an enclosing scope, do not emit a spurious
2469 // reference even if we have a capture, as that will emit an unwarranted
2470 // reference to our capture state, and will likely generate worse code than
2471 // emitting a local copy.
2472 if (E->refersToEnclosingVariableOrCapture())
2473 return false;
2474
2475 // For a local declaration declared in this function, we can always reference
2476 // it even if we don't have an odr-use.
2477 if (VD->hasLocalStorage()) {
2478 return VD->getDeclContext() ==
2479 dyn_cast_or_null<DeclContext>(CGF.CurCodeDecl);
2480 }
2481
2482 // For a global declaration, we can emit a reference to it if we know
2483 // for sure that we are able to emit a definition of it.
2484 VD = VD->getDefinition(CGF.getContext());
2485 if (!VD)
2486 return false;
2487
2488 // Don't emit a spurious reference if it might be to a variable that only
2489 // exists on a different device / target.
2490 // FIXME: This is unnecessarily broad. Check whether this would actually be a
2491 // cross-target reference.
2492 if (CGF.getLangOpts().OpenMP || CGF.getLangOpts().CUDA ||
2493 CGF.getLangOpts().OpenCL) {
2494 return false;
2495 }
2496
2497 // We can emit a spurious reference only if the linkage implies that we'll
2498 // be emitting a non-interposable symbol that will be retained until link
2499 // time.
2500 switch (CGF.CGM.getLLVMLinkageVarDefinition(VD, IsConstant)) {
2501 case llvm::GlobalValue::ExternalLinkage:
2502 case llvm::GlobalValue::LinkOnceODRLinkage:
2503 case llvm::GlobalValue::WeakODRLinkage:
2504 case llvm::GlobalValue::InternalLinkage:
2505 case llvm::GlobalValue::PrivateLinkage:
2506 return true;
2507 default:
2508 return false;
2509 }
2510}
2511
2512LValue CodeGenFunction::EmitDeclRefLValue(const DeclRefExpr *E) {
2513 const NamedDecl *ND = E->getDecl();
2514 QualType T = E->getType();
2515
2516 assert(E->isNonOdrUse() != NOUR_Unevaluated &&((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2517, __PRETTY_FUNCTION__))
2517 "should not emit an unevaluated operand")((E->isNonOdrUse() != NOUR_Unevaluated && "should not emit an unevaluated operand"
) ? static_cast<void> (0) : __assert_fail ("E->isNonOdrUse() != NOUR_Unevaluated && \"should not emit an unevaluated operand\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2517, __PRETTY_FUNCTION__))
;
2518
2519 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2520 // Global Named registers access via intrinsics only
2521 if (VD->getStorageClass() == SC_Register &&
2522 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
2523 return EmitGlobalNamedRegister(VD, CGM);
2524
2525 // If this DeclRefExpr does not constitute an odr-use of the variable,
2526 // we're not permitted to emit a reference to it in general, and it might
2527 // not be captured if capture would be necessary for a use. Emit the
2528 // constant value directly instead.
2529 if (E->isNonOdrUse() == NOUR_Constant &&
2530 (VD->getType()->isReferenceType() ||
2531 !canEmitSpuriousReferenceToVariable(*this, E, VD, true))) {
2532 VD->getAnyInitializer(VD);
2533 llvm::Constant *Val = ConstantEmitter(*this).emitAbstract(
2534 E->getLocation(), *VD->evaluateValue(), VD->getType());
2535 assert(Val && "failed to emit constant expression")((Val && "failed to emit constant expression") ? static_cast
<void> (0) : __assert_fail ("Val && \"failed to emit constant expression\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2535, __PRETTY_FUNCTION__))
;
2536
2537 Address Addr = Address::invalid();
2538 if (!VD->getType()->isReferenceType()) {
2539 // Spill the constant value to a global.
2540 Addr = CGM.createUnnamedGlobalFrom(*VD, Val,
2541 getContext().getDeclAlign(VD));
2542 llvm::Type *VarTy = getTypes().ConvertTypeForMem(VD->getType());
2543 auto *PTy = llvm::PointerType::get(
2544 VarTy, getContext().getTargetAddressSpace(VD->getType()));
2545 if (PTy != Addr.getType())
2546 Addr = Builder.CreatePointerBitCastOrAddrSpaceCast(Addr, PTy);
2547 } else {
2548 // Should we be using the alignment of the constant pointer we emitted?
2549 CharUnits Alignment =
2550 getNaturalTypeAlignment(E->getType(),
2551 /* BaseInfo= */ nullptr,
2552 /* TBAAInfo= */ nullptr,
2553 /* forPointeeType= */ true);
2554 Addr = Address(Val, Alignment);
2555 }
2556 return MakeAddrLValue(Addr, T, AlignmentSource::Decl);
2557 }
2558
2559 // FIXME: Handle other kinds of non-odr-use DeclRefExprs.
2560
2561 // Check for captured variables.
2562 if (E->refersToEnclosingVariableOrCapture()) {
2563 VD = VD->getCanonicalDecl();
2564 if (auto *FD = LambdaCaptureFields.lookup(VD))
2565 return EmitCapturedFieldLValue(*this, FD, CXXABIThisValue);
2566 else if (CapturedStmtInfo) {
2567 auto I = LocalDeclMap.find(VD);
2568 if (I != LocalDeclMap.end()) {
2569 if (VD->getType()->isReferenceType())
2570 return EmitLoadOfReferenceLValue(I->second, VD->getType(),
2571 AlignmentSource::Decl);
2572 return MakeAddrLValue(I->second, T);
2573 }
2574 LValue CapLVal =
2575 EmitCapturedFieldLValue(*this, CapturedStmtInfo->lookup(VD),
2576 CapturedStmtInfo->getContextValue());
2577 return MakeAddrLValue(
2578 Address(CapLVal.getPointer(), getContext().getDeclAlign(VD)),
2579 CapLVal.getType(), LValueBaseInfo(AlignmentSource::Decl),
2580 CapLVal.getTBAAInfo());
2581 }
2582
2583 assert(isa<BlockDecl>(CurCodeDecl))((isa<BlockDecl>(CurCodeDecl)) ? static_cast<void>
(0) : __assert_fail ("isa<BlockDecl>(CurCodeDecl)", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2583, __PRETTY_FUNCTION__))
;
2584 Address addr = GetAddrOfBlockDecl(VD);
2585 return MakeAddrLValue(addr, T, AlignmentSource::Decl);
2586 }
2587 }
2588
2589 // FIXME: We should be able to assert this for FunctionDecls as well!
2590 // FIXME: We should be able to assert this for all DeclRefExprs, not just
2591 // those with a valid source location.
2592 assert((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() ||(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2594, __PRETTY_FUNCTION__))
2593 !E->getLocation().isValid()) &&(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2594, __PRETTY_FUNCTION__))
2594 "Should not use decl without marking it used!")(((ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse
() || !E->getLocation().isValid()) && "Should not use decl without marking it used!"
) ? static_cast<void> (0) : __assert_fail ("(ND->isUsed(false) || !isa<VarDecl>(ND) || E->isNonOdrUse() || !E->getLocation().isValid()) && \"Should not use decl without marking it used!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2594, __PRETTY_FUNCTION__))
;
2595
2596 if (ND->hasAttr<WeakRefAttr>()) {
2597 const auto *VD = cast<ValueDecl>(ND);
2598 ConstantAddress Aliasee = CGM.GetWeakRefReference(VD);
2599 return MakeAddrLValue(Aliasee, T, AlignmentSource::Decl);
2600 }
2601
2602 if (const auto *VD = dyn_cast<VarDecl>(ND)) {
2603 // Check if this is a global variable.
2604 if (VD->hasLinkage() || VD->isStaticDataMember())
2605 return EmitGlobalVarDeclLValue(*this, E, VD);
2606
2607 Address addr = Address::invalid();
2608
2609 // The variable should generally be present in the local decl map.
2610 auto iter = LocalDeclMap.find(VD);
2611 if (iter != LocalDeclMap.end()) {
2612 addr = iter->second;
2613
2614 // Otherwise, it might be static local we haven't emitted yet for
2615 // some reason; most likely, because it's in an outer function.
2616 } else if (VD->isStaticLocal()) {
2617 addr = Address(CGM.getOrCreateStaticVarDecl(
2618 *VD, CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false)),
2619 getContext().getDeclAlign(VD));
2620
2621 // No other cases for now.
2622 } else {
2623 llvm_unreachable("DeclRefExpr for Decl not entered in LocalDeclMap?")::llvm::llvm_unreachable_internal("DeclRefExpr for Decl not entered in LocalDeclMap?"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2623)
;
2624 }
2625
2626
2627 // Check for OpenMP threadprivate variables.
2628 if (getLangOpts().OpenMP && !getLangOpts().OpenMPSimd &&
2629 VD->hasAttr<OMPThreadPrivateDeclAttr>()) {
2630 return EmitThreadPrivateVarDeclLValue(
2631 *this, VD, T, addr, getTypes().ConvertTypeForMem(VD->getType()),
2632 E->getExprLoc());
2633 }
2634
2635 // Drill into block byref variables.
2636 bool isBlockByref = VD->isEscapingByref();
2637 if (isBlockByref) {
2638 addr = emitBlockByrefAddress(addr, VD);
2639 }
2640
2641 // Drill into reference types.
2642 LValue LV = VD->getType()->isReferenceType() ?
2643 EmitLoadOfReferenceLValue(addr, VD->getType(), AlignmentSource::Decl) :
2644 MakeAddrLValue(addr, T, AlignmentSource::Decl);
2645
2646 bool isLocalStorage = VD->hasLocalStorage();
2647
2648 bool NonGCable = isLocalStorage &&
2649 !VD->getType()->isReferenceType() &&
2650 !isBlockByref;
2651 if (NonGCable) {
2652 LV.getQuals().removeObjCGCAttr();
2653 LV.setNonGC(true);
2654 }
2655
2656 bool isImpreciseLifetime =
2657 (isLocalStorage && !VD->hasAttr<ObjCPreciseLifetimeAttr>());
2658 if (isImpreciseLifetime)
2659 LV.setARCPreciseLifetime(ARCImpreciseLifetime);
2660 setObjCGCLValueClass(getContext(), E, LV);
2661 return LV;
2662 }
2663
2664 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
2665 return EmitFunctionDeclLValue(*this, E, FD);
2666
2667 // FIXME: While we're emitting a binding from an enclosing scope, all other
2668 // DeclRefExprs we see should be implicitly treated as if they also refer to
2669 // an enclosing scope.
2670 if (const auto *BD = dyn_cast<BindingDecl>(ND))
2671 return EmitLValue(BD->getBinding());
2672
2673 llvm_unreachable("Unhandled DeclRefExpr")::llvm::llvm_unreachable_internal("Unhandled DeclRefExpr", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2673)
;
2674}
2675
2676LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
2677 // __extension__ doesn't affect lvalue-ness.
2678 if (E->getOpcode() == UO_Extension)
2679 return EmitLValue(E->getSubExpr());
2680
2681 QualType ExprTy = getContext().getCanonicalType(E->getSubExpr()->getType());
2682 switch (E->getOpcode()) {
2683 default: llvm_unreachable("Unknown unary operator lvalue!")::llvm::llvm_unreachable_internal("Unknown unary operator lvalue!"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2683)
;
2684 case UO_Deref: {
2685 QualType T = E->getSubExpr()->getType()->getPointeeType();
2686 assert(!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type")((!T.isNull() && "CodeGenFunction::EmitUnaryOpLValue: Illegal type"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"CodeGenFunction::EmitUnaryOpLValue: Illegal type\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2686, __PRETTY_FUNCTION__))
;
2687
2688 LValueBaseInfo BaseInfo;
2689 TBAAAccessInfo TBAAInfo;
2690 Address Addr = EmitPointerWithAlignment(E->getSubExpr(), &BaseInfo,
2691 &TBAAInfo);
2692 LValue LV = MakeAddrLValue(Addr, T, BaseInfo, TBAAInfo);
2693 LV.getQuals().setAddressSpace(ExprTy.getAddressSpace());
2694
2695 // We should not generate __weak write barrier on indirect reference
2696 // of a pointer to object; as in void foo (__weak id *param); *param = 0;
2697 // But, we continue to generate __strong write barrier on indirect write
2698 // into a pointer to object.
2699 if (getLangOpts().ObjC &&
2700 getLangOpts().getGC() != LangOptions::NonGC &&
2701 LV.isObjCWeak())
2702 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
2703 return LV;
2704 }
2705 case UO_Real:
2706 case UO_Imag: {
2707 LValue LV = EmitLValue(E->getSubExpr());
2708 assert(LV.isSimple() && "real/imag on non-ordinary l-value")((LV.isSimple() && "real/imag on non-ordinary l-value"
) ? static_cast<void> (0) : __assert_fail ("LV.isSimple() && \"real/imag on non-ordinary l-value\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2708, __PRETTY_FUNCTION__))
;
2709
2710 // __real is valid on scalars. This is a faster way of testing that.
2711 // __imag can only produce an rvalue on scalars.
2712 if (E->getOpcode() == UO_Real &&
2713 !LV.getAddress().getElementType()->isStructTy()) {
2714 assert(E->getSubExpr()->getType()->isArithmeticType())((E->getSubExpr()->getType()->isArithmeticType()) ? static_cast
<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isArithmeticType()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2714, __PRETTY_FUNCTION__))
;
2715 return LV;
2716 }
2717
2718 QualType T = ExprTy->castAs<ComplexType>()->getElementType();
2719
2720 Address Component =
2721 (E->getOpcode() == UO_Real
2722 ? emitAddrOfRealComponent(LV.getAddress(), LV.getType())
2723 : emitAddrOfImagComponent(LV.getAddress(), LV.getType()));
2724 LValue ElemLV = MakeAddrLValue(Component, T, LV.getBaseInfo(),
2725 CGM.getTBAAInfoForSubobject(LV, T));
2726 ElemLV.getQuals().addQualifiers(LV.getQuals());
2727 return ElemLV;
2728 }
2729 case UO_PreInc:
2730 case UO_PreDec: {
2731 LValue LV = EmitLValue(E->getSubExpr());
2732 bool isInc = E->getOpcode() == UO_PreInc;
2733
2734 if (E->getType()->isAnyComplexType())
2735 EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
2736 else
2737 EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
2738 return LV;
2739 }
2740 }
2741}
2742
2743LValue CodeGenFunction::EmitStringLiteralLValue(const StringLiteral *E) {
2744 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromLiteral(E),
2745 E->getType(), AlignmentSource::Decl);
2746}
2747
2748LValue CodeGenFunction::EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E) {
2749 return MakeAddrLValue(CGM.GetAddrOfConstantStringFromObjCEncode(E),
2750 E->getType(), AlignmentSource::Decl);
2751}
2752
2753LValue CodeGenFunction::EmitPredefinedLValue(const PredefinedExpr *E) {
2754 auto SL = E->getFunctionName();
2755 assert(SL != nullptr && "No StringLiteral name in PredefinedExpr")((SL != nullptr && "No StringLiteral name in PredefinedExpr"
) ? static_cast<void> (0) : __assert_fail ("SL != nullptr && \"No StringLiteral name in PredefinedExpr\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2755, __PRETTY_FUNCTION__))
;
2756 StringRef FnName = CurFn->getName();
2757 if (FnName.startswith("\01"))
2758 FnName = FnName.substr(1);
2759 StringRef NameItems[] = {
2760 PredefinedExpr::getIdentKindName(E->getIdentKind()), FnName};
2761 std::string GVName = llvm::join(NameItems, NameItems + 2, ".");
2762 if (auto *BD = dyn_cast_or_null<BlockDecl>(CurCodeDecl)) {
2763 std::string Name = SL->getString();
2764 if (!Name.empty()) {
2765 unsigned Discriminator =
2766 CGM.getCXXABI().getMangleContext().getBlockId(BD, true);
2767 if (Discriminator)
2768 Name += "_" + Twine(Discriminator + 1).str();
2769 auto C = CGM.GetAddrOfConstantCString(Name, GVName.c_str());
2770 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2771 } else {
2772 auto C = CGM.GetAddrOfConstantCString(FnName, GVName.c_str());
2773 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2774 }
2775 }
2776 auto C = CGM.GetAddrOfConstantStringFromLiteral(SL, GVName);
2777 return MakeAddrLValue(C, E->getType(), AlignmentSource::Decl);
2778}
2779
2780/// Emit a type description suitable for use by a runtime sanitizer library. The
2781/// format of a type descriptor is
2782///
2783/// \code
2784/// { i16 TypeKind, i16 TypeInfo }
2785/// \endcode
2786///
2787/// followed by an array of i8 containing the type name. TypeKind is 0 for an
2788/// integer, 1 for a floating point value, and -1 for anything else.
2789llvm::Constant *CodeGenFunction::EmitCheckTypeDescriptor(QualType T) {
2790 // Only emit each type's descriptor once.
2791 if (llvm::Constant *C = CGM.getTypeDescriptorFromMap(T))
2792 return C;
2793
2794 uint16_t TypeKind = -1;
2795 uint16_t TypeInfo = 0;
2796
2797 if (T->isIntegerType()) {
2798 TypeKind = 0;
2799 TypeInfo = (llvm::Log2_32(getContext().getTypeSize(T)) << 1) |
2800 (T->isSignedIntegerType() ? 1 : 0);
2801 } else if (T->isFloatingType()) {
2802 TypeKind = 1;
2803 TypeInfo = getContext().getTypeSize(T);
2804 }
2805
2806 // Format the type name as if for a diagnostic, including quotes and
2807 // optionally an 'aka'.
2808 SmallString<32> Buffer;
2809 CGM.getDiags().ConvertArgToString(DiagnosticsEngine::ak_qualtype,
2810 (intptr_t)T.getAsOpaquePtr(),
2811 StringRef(), StringRef(), None, Buffer,
2812 None);
2813
2814 llvm::Constant *Components[] = {
2815 Builder.getInt16(TypeKind), Builder.getInt16(TypeInfo),
2816 llvm::ConstantDataArray::getString(getLLVMContext(), Buffer)
2817 };
2818 llvm::Constant *Descriptor = llvm::ConstantStruct::getAnon(Components);
2819
2820 auto *GV = new llvm::GlobalVariable(
2821 CGM.getModule(), Descriptor->getType(),
2822 /*isConstant=*/true, llvm::GlobalVariable::PrivateLinkage, Descriptor);
2823 GV->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
2824 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(GV);
2825
2826 // Remember the descriptor for this type.
2827 CGM.setTypeDescriptorInMap(T, GV);
2828
2829 return GV;
2830}
2831
2832llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
2833 llvm::Type *TargetTy = IntPtrTy;
2834
2835 if (V->getType() == TargetTy)
2836 return V;
2837
2838 // Floating-point types which fit into intptr_t are bitcast to integers
2839 // and then passed directly (after zero-extension, if necessary).
2840 if (V->getType()->isFloatingPointTy()) {
2841 unsigned Bits = V->getType()->getPrimitiveSizeInBits();
2842 if (Bits <= TargetTy->getIntegerBitWidth())
2843 V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
2844 Bits));
2845 }
2846
2847 // Integers which fit in intptr_t are zero-extended and passed directly.
2848 if (V->getType()->isIntegerTy() &&
2849 V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())
2850 return Builder.CreateZExt(V, TargetTy);
2851
2852 // Pointers are passed directly, everything else is passed by address.
2853 if (!V->getType()->isPointerTy()) {
2854 Address Ptr = CreateDefaultAlignTempAlloca(V->getType());
2855 Builder.CreateStore(V, Ptr);
2856 V = Ptr.getPointer();
2857 }
2858 return Builder.CreatePtrToInt(V, TargetTy);
2859}
2860
2861/// Emit a representation of a SourceLocation for passing to a handler
2862/// in a sanitizer runtime library. The format for this data is:
2863/// \code
2864/// struct SourceLocation {
2865/// const char *Filename;
2866/// int32_t Line, Column;
2867/// };
2868/// \endcode
2869/// For an invalid SourceLocation, the Filename pointer is null.
2870llvm::Constant *CodeGenFunction::EmitCheckSourceLocation(SourceLocation Loc) {
2871 llvm::Constant *Filename;
2872 int Line, Column;
2873
2874 PresumedLoc PLoc = getContext().getSourceManager().getPresumedLoc(Loc);
2875 if (PLoc.isValid()) {
2876 StringRef FilenameString = PLoc.getFilename();
2877
2878 int PathComponentsToStrip =
2879 CGM.getCodeGenOpts().EmitCheckPathComponentsToStrip;
2880 if (PathComponentsToStrip < 0) {
2881 assert(PathComponentsToStrip != INT_MIN)((PathComponentsToStrip != (-2147483647 -1)) ? static_cast<
void> (0) : __assert_fail ("PathComponentsToStrip != INT_MIN"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2881, __PRETTY_FUNCTION__))
;
2882 int PathComponentsToKeep = -PathComponentsToStrip;
2883 auto I = llvm::sys::path::rbegin(FilenameString);
2884 auto E = llvm::sys::path::rend(FilenameString);
2885 while (I != E && --PathComponentsToKeep)
2886 ++I;
2887
2888 FilenameString = FilenameString.substr(I - E);
2889 } else if (PathComponentsToStrip > 0) {
2890 auto I = llvm::sys::path::begin(FilenameString);
2891 auto E = llvm::sys::path::end(FilenameString);
2892 while (I != E && PathComponentsToStrip--)
2893 ++I;
2894
2895 if (I != E)
2896 FilenameString =
2897 FilenameString.substr(I - llvm::sys::path::begin(FilenameString));
2898 else
2899 FilenameString = llvm::sys::path::filename(FilenameString);
2900 }
2901
2902 auto FilenameGV = CGM.GetAddrOfConstantCString(FilenameString, ".src");
2903 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(
2904 cast<llvm::GlobalVariable>(FilenameGV.getPointer()));
2905 Filename = FilenameGV.getPointer();
2906 Line = PLoc.getLine();
2907 Column = PLoc.getColumn();
2908 } else {
2909 Filename = llvm::Constant::getNullValue(Int8PtrTy);
2910 Line = Column = 0;
2911 }
2912
2913 llvm::Constant *Data[] = {Filename, Builder.getInt32(Line),
2914 Builder.getInt32(Column)};
2915
2916 return llvm::ConstantStruct::getAnon(Data);
2917}
2918
2919namespace {
2920/// Specify under what conditions this check can be recovered
2921enum class CheckRecoverableKind {
2922 /// Always terminate program execution if this check fails.
2923 Unrecoverable,
2924 /// Check supports recovering, runtime has both fatal (noreturn) and
2925 /// non-fatal handlers for this check.
2926 Recoverable,
2927 /// Runtime conditionally aborts, always need to support recovery.
2928 AlwaysRecoverable
2929};
2930}
2931
2932static CheckRecoverableKind getRecoverableKind(SanitizerMask Kind) {
2933 assert(Kind.countPopulation() == 1)((Kind.countPopulation() == 1) ? static_cast<void> (0) :
__assert_fail ("Kind.countPopulation() == 1", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2933, __PRETTY_FUNCTION__))
;
2934 if (Kind == SanitizerKind::Function || Kind == SanitizerKind::Vptr)
2935 return CheckRecoverableKind::AlwaysRecoverable;
2936 else if (Kind == SanitizerKind::Return || Kind == SanitizerKind::Unreachable)
2937 return CheckRecoverableKind::Unrecoverable;
2938 else
2939 return CheckRecoverableKind::Recoverable;
2940}
2941
2942namespace {
2943struct SanitizerHandlerInfo {
2944 char const *const Name;
2945 unsigned Version;
2946};
2947}
2948
2949const SanitizerHandlerInfo SanitizerHandlers[] = {
2950#define SANITIZER_CHECK(Enum, Name, Version) {#Name, Version},
2951 LIST_SANITIZER_CHECKSSANITIZER_CHECK(AddOverflow, add_overflow, 0) SANITIZER_CHECK
(BuiltinUnreachable, builtin_unreachable, 0) SANITIZER_CHECK(
CFICheckFail, cfi_check_fail, 0) SANITIZER_CHECK(DivremOverflow
, divrem_overflow, 0) SANITIZER_CHECK(DynamicTypeCacheMiss, dynamic_type_cache_miss
, 0) SANITIZER_CHECK(FloatCastOverflow, float_cast_overflow, 0
) SANITIZER_CHECK(FunctionTypeMismatch, function_type_mismatch
, 1) SANITIZER_CHECK(ImplicitConversion, implicit_conversion,
0) SANITIZER_CHECK(InvalidBuiltin, invalid_builtin, 0) SANITIZER_CHECK
(LoadInvalidValue, load_invalid_value, 0) SANITIZER_CHECK(MissingReturn
, missing_return, 0) SANITIZER_CHECK(MulOverflow, mul_overflow
, 0) SANITIZER_CHECK(NegateOverflow, negate_overflow, 0) SANITIZER_CHECK
(NullabilityArg, nullability_arg, 0) SANITIZER_CHECK(NullabilityReturn
, nullability_return, 1) SANITIZER_CHECK(NonnullArg, nonnull_arg
, 0) SANITIZER_CHECK(NonnullReturn, nonnull_return, 1) SANITIZER_CHECK
(OutOfBounds, out_of_bounds, 0) SANITIZER_CHECK(PointerOverflow
, pointer_overflow, 0) SANITIZER_CHECK(ShiftOutOfBounds, shift_out_of_bounds
, 0) SANITIZER_CHECK(SubOverflow, sub_overflow, 0) SANITIZER_CHECK
(TypeMismatch, type_mismatch, 1) SANITIZER_CHECK(AlignmentAssumption
, alignment_assumption, 0) SANITIZER_CHECK(VLABoundNotPositive
, vla_bound_not_positive, 0)
2952#undef SANITIZER_CHECK
2953};
2954
2955static void emitCheckHandlerCall(CodeGenFunction &CGF,
2956 llvm::FunctionType *FnType,
2957 ArrayRef<llvm::Value *> FnArgs,
2958 SanitizerHandler CheckHandler,
2959 CheckRecoverableKind RecoverKind, bool IsFatal,
2960 llvm::BasicBlock *ContBB) {
2961 assert(IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable)((IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable
) ? static_cast<void> (0) : __assert_fail ("IsFatal || RecoverKind != CheckRecoverableKind::Unrecoverable"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 2961, __PRETTY_FUNCTION__))
;
2962 Optional<ApplyDebugLocation> DL;
2963 if (!CGF.Builder.getCurrentDebugLocation()) {
2964 // Ensure that the call has at least an artificial debug location.
2965 DL.emplace(CGF, SourceLocation());
2966 }
2967 bool NeedsAbortSuffix =
2968 IsFatal && RecoverKind != CheckRecoverableKind::Unrecoverable;
2969 bool MinimalRuntime = CGF.CGM.getCodeGenOpts().SanitizeMinimalRuntime;
2970 const SanitizerHandlerInfo &CheckInfo = SanitizerHandlers[CheckHandler];
2971 const StringRef CheckName = CheckInfo.Name;
2972 std::string FnName = "__ubsan_handle_" + CheckName.str();
2973 if (CheckInfo.Version && !MinimalRuntime)
2974 FnName += "_v" + llvm::utostr(CheckInfo.Version);
2975 if (MinimalRuntime)
2976 FnName += "_minimal";
2977 if (NeedsAbortSuffix)
2978 FnName += "_abort";
2979 bool MayReturn =
2980 !IsFatal || RecoverKind == CheckRecoverableKind::AlwaysRecoverable;
2981
2982 llvm::AttrBuilder B;
2983 if (!MayReturn) {
2984 B.addAttribute(llvm::Attribute::NoReturn)
2985 .addAttribute(llvm::Attribute::NoUnwind);
2986 }
2987 B.addAttribute(llvm::Attribute::UWTable);
2988
2989 llvm::FunctionCallee Fn = CGF.CGM.CreateRuntimeFunction(
2990 FnType, FnName,
2991 llvm::AttributeList::get(CGF.getLLVMContext(),
2992 llvm::AttributeList::FunctionIndex, B),
2993 /*Local=*/true);
2994 llvm::CallInst *HandlerCall = CGF.EmitNounwindRuntimeCall(Fn, FnArgs);
2995 if (!MayReturn) {
2996 HandlerCall->setDoesNotReturn();
2997 CGF.Builder.CreateUnreachable();
2998 } else {
2999 CGF.Builder.CreateBr(ContBB);
3000 }
3001}
3002
3003void CodeGenFunction::EmitCheck(
3004 ArrayRef<std::pair<llvm::Value *, SanitizerMask>> Checked,
3005 SanitizerHandler CheckHandler, ArrayRef<llvm::Constant *> StaticArgs,
3006 ArrayRef<llvm::Value *> DynamicArgs) {
3007 assert(IsSanitizerScope)((IsSanitizerScope) ? static_cast<void> (0) : __assert_fail
("IsSanitizerScope", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3007, __PRETTY_FUNCTION__))
;
3008 assert(Checked.size() > 0)((Checked.size() > 0) ? static_cast<void> (0) : __assert_fail
("Checked.size() > 0", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3008, __PRETTY_FUNCTION__))
;
3009 assert(CheckHandler >= 0 &&((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
(0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3010, __PRETTY_FUNCTION__))
3010 size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers))((CheckHandler >= 0 && size_t(CheckHandler) < llvm
::array_lengthof(SanitizerHandlers)) ? static_cast<void>
(0) : __assert_fail ("CheckHandler >= 0 && size_t(CheckHandler) < llvm::array_lengthof(SanitizerHandlers)"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3010, __PRETTY_FUNCTION__))
;
3011 const StringRef CheckName = SanitizerHandlers[CheckHandler].Name;
3012
3013 llvm::Value *FatalCond = nullptr;
3014 llvm::Value *RecoverableCond = nullptr;
3015 llvm::Value *TrapCond = nullptr;
3016 for (int i = 0, n = Checked.size(); i < n; ++i) {
3017 llvm::Value *Check = Checked[i].first;
3018 // -fsanitize-trap= overrides -fsanitize-recover=.
3019 llvm::Value *&Cond =
3020 CGM.getCodeGenOpts().SanitizeTrap.has(Checked[i].second)
3021 ? TrapCond
3022 : CGM.getCodeGenOpts().SanitizeRecover.has(Checked[i].second)
3023 ? RecoverableCond
3024 : FatalCond;
3025 Cond = Cond ? Builder.CreateAnd(Cond, Check) : Check;
3026 }
3027
3028 if (TrapCond)
3029 EmitTrapCheck(TrapCond);
3030 if (!FatalCond && !RecoverableCond)
3031 return;
3032
3033 llvm::Value *JointCond;
3034 if (FatalCond && RecoverableCond)
3035 JointCond = Builder.CreateAnd(FatalCond, RecoverableCond);
3036 else
3037 JointCond = FatalCond ? FatalCond : RecoverableCond;
3038 assert(JointCond)((JointCond) ? static_cast<void> (0) : __assert_fail ("JointCond"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3038, __PRETTY_FUNCTION__))
;
3039
3040 CheckRecoverableKind RecoverKind = getRecoverableKind(Checked[0].second);
3041 assert(SanOpts.has(Checked[0].second))((SanOpts.has(Checked[0].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[0].second)", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3041, __PRETTY_FUNCTION__))
;
3042#ifndef NDEBUG
3043 for (int i = 1, n = Checked.size(); i < n; ++i) {
3044 assert(RecoverKind == getRecoverableKind(Checked[i].second) &&((RecoverKind == getRecoverableKind(Checked[i].second) &&
"All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3045, __PRETTY_FUNCTION__))
3045 "All recoverable kinds in a single check must be same!")((RecoverKind == getRecoverableKind(Checked[i].second) &&
"All recoverable kinds in a single check must be same!") ? static_cast
<void> (0) : __assert_fail ("RecoverKind == getRecoverableKind(Checked[i].second) && \"All recoverable kinds in a single check must be same!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3045, __PRETTY_FUNCTION__))
;
3046 assert(SanOpts.has(Checked[i].second))((SanOpts.has(Checked[i].second)) ? static_cast<void> (
0) : __assert_fail ("SanOpts.has(Checked[i].second)", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3046, __PRETTY_FUNCTION__))
;
3047 }
3048#endif
3049
3050 llvm::BasicBlock *Cont = createBasicBlock("cont");
3051 llvm::BasicBlock *Handlers = createBasicBlock("handler." + CheckName);
3052 llvm::Instruction *Branch = Builder.CreateCondBr(JointCond, Cont, Handlers);
3053 // Give hint that we very much don't expect to execute the handler
3054 // Value chosen to match UR_NONTAKEN_WEIGHT, see BranchProbabilityInfo.cpp
3055 llvm::MDBuilder MDHelper(getLLVMContext());
3056 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3057 Branch->setMetadata(llvm::LLVMContext::MD_prof, Node);
3058 EmitBlock(Handlers);
3059
3060 // Handler functions take an i8* pointing to the (handler-specific) static
3061 // information block, followed by a sequence of intptr_t arguments
3062 // representing operand values.
3063 SmallVector<llvm::Value *, 4> Args;
3064 SmallVector<llvm::Type *, 4> ArgTypes;
3065 if (!CGM.getCodeGenOpts().SanitizeMinimalRuntime) {
3066 Args.reserve(DynamicArgs.size() + 1);
3067 ArgTypes.reserve(DynamicArgs.size() + 1);
3068
3069 // Emit handler arguments and create handler function type.
3070 if (!StaticArgs.empty()) {
3071 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3072 auto *InfoPtr =
3073 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3074 llvm::GlobalVariable::PrivateLinkage, Info);
3075 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3076 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3077 Args.push_back(Builder.CreateBitCast(InfoPtr, Int8PtrTy));
3078 ArgTypes.push_back(Int8PtrTy);
3079 }
3080
3081 for (size_t i = 0, n = DynamicArgs.size(); i != n; ++i) {
3082 Args.push_back(EmitCheckValue(DynamicArgs[i]));
3083 ArgTypes.push_back(IntPtrTy);
3084 }
3085 }
3086
3087 llvm::FunctionType *FnType =
3088 llvm::FunctionType::get(CGM.VoidTy, ArgTypes, false);
3089
3090 if (!FatalCond || !RecoverableCond) {
3091 // Simple case: we need to generate a single handler call, either
3092 // fatal, or non-fatal.
3093 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind,
3094 (FatalCond != nullptr), Cont);
3095 } else {
3096 // Emit two handler calls: first one for set of unrecoverable checks,
3097 // another one for recoverable.
3098 llvm::BasicBlock *NonFatalHandlerBB =
3099 createBasicBlock("non_fatal." + CheckName);
3100 llvm::BasicBlock *FatalHandlerBB = createBasicBlock("fatal." + CheckName);
3101 Builder.CreateCondBr(FatalCond, NonFatalHandlerBB, FatalHandlerBB);
3102 EmitBlock(FatalHandlerBB);
3103 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, true,
3104 NonFatalHandlerBB);
3105 EmitBlock(NonFatalHandlerBB);
3106 emitCheckHandlerCall(*this, FnType, Args, CheckHandler, RecoverKind, false,
3107 Cont);
3108 }
3109
3110 EmitBlock(Cont);
3111}
3112
3113void CodeGenFunction::EmitCfiSlowPathCheck(
3114 SanitizerMask Kind, llvm::Value *Cond, llvm::ConstantInt *TypeId,
3115 llvm::Value *Ptr, ArrayRef<llvm::Constant *> StaticArgs) {
3116 llvm::BasicBlock *Cont = createBasicBlock("cfi.cont");
3117
3118 llvm::BasicBlock *CheckBB = createBasicBlock("cfi.slowpath");
3119 llvm::BranchInst *BI = Builder.CreateCondBr(Cond, Cont, CheckBB);
3120
3121 llvm::MDBuilder MDHelper(getLLVMContext());
3122 llvm::MDNode *Node = MDHelper.createBranchWeights((1U << 20) - 1, 1);
3123 BI->setMetadata(llvm::LLVMContext::MD_prof, Node);
3124
3125 EmitBlock(CheckBB);
3126
3127 bool WithDiag = !CGM.getCodeGenOpts().SanitizeTrap.has(Kind);
3128
3129 llvm::CallInst *CheckCall;
3130 llvm::FunctionCallee SlowPathFn;
3131 if (WithDiag) {
3132 llvm::Constant *Info = llvm::ConstantStruct::getAnon(StaticArgs);
3133 auto *InfoPtr =
3134 new llvm::GlobalVariable(CGM.getModule(), Info->getType(), false,
3135 llvm::GlobalVariable::PrivateLinkage, Info);
3136 InfoPtr->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
3137 CGM.getSanitizerMetadata()->disableSanitizerForGlobal(InfoPtr);
3138
3139 SlowPathFn = CGM.getModule().getOrInsertFunction(
3140 "__cfi_slowpath_diag",
3141 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy},
3142 false));
3143 CheckCall = Builder.CreateCall(
3144 SlowPathFn, {TypeId, Ptr, Builder.CreateBitCast(InfoPtr, Int8PtrTy)});
3145 } else {
3146 SlowPathFn = CGM.getModule().getOrInsertFunction(
3147 "__cfi_slowpath",
3148 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy}, false));
3149 CheckCall = Builder.CreateCall(SlowPathFn, {TypeId, Ptr});
3150 }
3151
3152 CGM.setDSOLocal(
3153 cast<llvm::GlobalValue>(SlowPathFn.getCallee()->stripPointerCasts()));
3154 CheckCall->setDoesNotThrow();
3155
3156 EmitBlock(Cont);
3157}
3158
3159// Emit a stub for __cfi_check function so that the linker knows about this
3160// symbol in LTO mode.
3161void CodeGenFunction::EmitCfiCheckStub() {
3162 llvm::Module *M = &CGM.getModule();
3163 auto &Ctx = M->getContext();
3164 llvm::Function *F = llvm::Function::Create(
3165 llvm::FunctionType::get(VoidTy, {Int64Ty, Int8PtrTy, Int8PtrTy}, false),
3166 llvm::GlobalValue::WeakAnyLinkage, "__cfi_check", M);
3167 CGM.setDSOLocal(F);
3168 llvm::BasicBlock *BB = llvm::BasicBlock::Create(Ctx, "entry", F);
3169 // FIXME: consider emitting an intrinsic call like
3170 // call void @llvm.cfi_check(i64 %0, i8* %1, i8* %2)
3171 // which can be lowered in CrossDSOCFI pass to the actual contents of
3172 // __cfi_check. This would allow inlining of __cfi_check calls.
3173 llvm::CallInst::Create(
3174 llvm::Intrinsic::getDeclaration(M, llvm::Intrinsic::trap), "", BB);
3175 llvm::ReturnInst::Create(Ctx, nullptr, BB);
3176}
3177
3178// This function is basically a switch over the CFI failure kind, which is
3179// extracted from CFICheckFailData (1st function argument). Each case is either
3180// llvm.trap or a call to one of the two runtime handlers, based on
3181// -fsanitize-trap and -fsanitize-recover settings. Default case (invalid
3182// failure kind) traps, but this should really never happen. CFICheckFailData
3183// can be nullptr if the calling module has -fsanitize-trap behavior for this
3184// check kind; in this case __cfi_check_fail traps as well.
3185void CodeGenFunction::EmitCfiCheckFail() {
3186 SanitizerScope SanScope(this);
3187 FunctionArgList Args;
3188 ImplicitParamDecl ArgData(getContext(), getContext().VoidPtrTy,
3189 ImplicitParamDecl::Other);
3190 ImplicitParamDecl ArgAddr(getContext(), getContext().VoidPtrTy,
3191 ImplicitParamDecl::Other);
3192 Args.push_back(&ArgData);
3193 Args.push_back(&ArgAddr);
3194
3195 const CGFunctionInfo &FI =
3196 CGM.getTypes().arrangeBuiltinFunctionDeclaration(getContext().VoidTy, Args);
3197
3198 llvm::Function *F = llvm::Function::Create(
3199 llvm::FunctionType::get(VoidTy, {VoidPtrTy, VoidPtrTy}, false),
3200 llvm::GlobalValue::WeakODRLinkage, "__cfi_check_fail", &CGM.getModule());
3201 F->setVisibility(llvm::GlobalValue::HiddenVisibility);
3202
3203 StartFunction(GlobalDecl(), CGM.getContext().VoidTy, F, FI, Args,
3204 SourceLocation());
3205
3206 // This function should not be affected by blacklist. This function does
3207 // not have a source location, but "src:*" would still apply. Revert any
3208 // changes to SanOpts made in StartFunction.
3209 SanOpts = CGM.getLangOpts().Sanitize;
3210
3211 llvm::Value *Data =
3212 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgData), /*Volatile=*/false,
3213 CGM.getContext().VoidPtrTy, ArgData.getLocation());
3214 llvm::Value *Addr =
3215 EmitLoadOfScalar(GetAddrOfLocalVar(&ArgAddr), /*Volatile=*/false,
3216 CGM.getContext().VoidPtrTy, ArgAddr.getLocation());
3217
3218 // Data == nullptr means the calling module has trap behaviour for this check.
3219 llvm::Value *DataIsNotNullPtr =
3220 Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
3221 EmitTrapCheck(DataIsNotNullPtr);
3222
3223 llvm::StructType *SourceLocationTy =
3224 llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
3225 llvm::StructType *CfiCheckFailDataTy =
3226 llvm::StructType::get(Int8Ty, SourceLocationTy, VoidPtrTy);
3227
3228 llvm::Value *V = Builder.CreateConstGEP2_32(
3229 CfiCheckFailDataTy,
3230 Builder.CreatePointerCast(Data, CfiCheckFailDataTy->getPointerTo(0)), 0,
3231 0);
3232 Address CheckKindAddr(V, getIntAlign());
3233 llvm::Value *CheckKind = Builder.CreateLoad(CheckKindAddr);
3234
3235 llvm::Value *AllVtables = llvm::MetadataAsValue::get(
3236 CGM.getLLVMContext(),
3237 llvm::MDString::get(CGM.getLLVMContext(), "all-vtables"));
3238 llvm::Value *ValidVtable = Builder.CreateZExt(
3239 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::type_test),
3240 {Addr, AllVtables}),
3241 IntPtrTy);
3242
3243 const std::pair<int, SanitizerMask> CheckKinds[] = {
3244 {CFITCK_VCall, SanitizerKind::CFIVCall},
3245 {CFITCK_NVCall, SanitizerKind::CFINVCall},
3246 {CFITCK_DerivedCast, SanitizerKind::CFIDerivedCast},
3247 {CFITCK_UnrelatedCast, SanitizerKind::CFIUnrelatedCast},
3248 {CFITCK_ICall, SanitizerKind::CFIICall}};
3249
3250 SmallVector<std::pair<llvm::Value *, SanitizerMask>, 5> Checks;
3251 for (auto CheckKindMaskPair : CheckKinds) {
3252 int Kind = CheckKindMaskPair.first;
3253 SanitizerMask Mask = CheckKindMaskPair.second;
3254 llvm::Value *Cond =
3255 Builder.CreateICmpNE(CheckKind, llvm::ConstantInt::get(Int8Ty, Kind));
3256 if (CGM.getLangOpts().Sanitize.has(Mask))
3257 EmitCheck(std::make_pair(Cond, Mask), SanitizerHandler::CFICheckFail, {},
3258 {Data, Addr, ValidVtable});
3259 else
3260 EmitTrapCheck(Cond);
3261 }
3262
3263 FinishFunction();
3264 // The only reference to this function will be created during LTO link.
3265 // Make sure it survives until then.
3266 CGM.addUsedGlobal(F);
3267}
3268
3269void CodeGenFunction::EmitUnreachable(SourceLocation Loc) {
3270 if (SanOpts.has(SanitizerKind::Unreachable)) {
3271 SanitizerScope SanScope(this);
3272 EmitCheck(std::make_pair(static_cast<llvm::Value *>(Builder.getFalse()),
3273 SanitizerKind::Unreachable),
3274 SanitizerHandler::BuiltinUnreachable,
3275 EmitCheckSourceLocation(Loc), None);
3276 }
3277 Builder.CreateUnreachable();
3278}
3279
3280void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked) {
3281 llvm::BasicBlock *Cont = createBasicBlock("cont");
3282
3283 // If we're optimizing, collapse all calls to trap down to just one per
3284 // function to save on code size.
3285 if (!CGM.getCodeGenOpts().OptimizationLevel || !TrapBB) {
3286 TrapBB = createBasicBlock("trap");
3287 Builder.CreateCondBr(Checked, Cont, TrapBB);
3288 EmitBlock(TrapBB);
3289 llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap);
3290 TrapCall->setDoesNotReturn();
3291 TrapCall->setDoesNotThrow();
3292 Builder.CreateUnreachable();
3293 } else {
3294 Builder.CreateCondBr(Checked, Cont, TrapBB);
3295 }
3296
3297 EmitBlock(Cont);
3298}
3299
3300llvm::CallInst *CodeGenFunction::EmitTrapCall(llvm::Intrinsic::ID IntrID) {
3301 llvm::CallInst *TrapCall = Builder.CreateCall(CGM.getIntrinsic(IntrID));
3302
3303 if (!CGM.getCodeGenOpts().TrapFuncName.empty()) {
3304 auto A = llvm::Attribute::get(getLLVMContext(), "trap-func-name",
3305 CGM.getCodeGenOpts().TrapFuncName);
3306 TrapCall->addAttribute(llvm::AttributeList::FunctionIndex, A);
3307 }
3308
3309 return TrapCall;
3310}
3311
3312Address CodeGenFunction::EmitArrayToPointerDecay(const Expr *E,
3313 LValueBaseInfo *BaseInfo,
3314 TBAAAccessInfo *TBAAInfo) {
3315 assert(E->getType()->isArrayType() &&((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3316, __PRETTY_FUNCTION__))
3316 "Array to pointer decay must have array source type!")((E->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3316, __PRETTY_FUNCTION__))
;
3317
3318 // Expressions of array type can't be bitfields or vector elements.
3319 LValue LV = EmitLValue(E);
3320 Address Addr = LV.getAddress();
3321
3322 // If the array type was an incomplete type, we need to make sure
3323 // the decay ends up being the right type.
3324 llvm::Type *NewTy = ConvertType(E->getType());
3325 Addr = Builder.CreateElementBitCast(Addr, NewTy);
3326
3327 // Note that VLA pointers are always decayed, so we don't need to do
3328 // anything here.
3329 if (!E->getType()->isVariableArrayType()) {
3330 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3331, __PRETTY_FUNCTION__))
3331 "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3331, __PRETTY_FUNCTION__))
;
3332 Addr = Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3333 }
3334
3335 // The result of this decay conversion points to an array element within the
3336 // base lvalue. However, since TBAA currently does not support representing
3337 // accesses to elements of member arrays, we conservatively represent accesses
3338 // to the pointee object as if it had no any base lvalue specified.
3339 // TODO: Support TBAA for member arrays.
3340 QualType EltType = E->getType()->castAsArrayTypeUnsafe()->getElementType();
3341 if (BaseInfo) *BaseInfo = LV.getBaseInfo();
3342 if (TBAAInfo) *TBAAInfo = CGM.getTBAAAccessInfo(EltType);
3343
3344 return Builder.CreateElementBitCast(Addr, ConvertTypeForMem(EltType));
3345}
3346
3347/// isSimpleArrayDecayOperand - If the specified expr is a simple decay from an
3348/// array to pointer, return the array subexpression.
3349static const Expr *isSimpleArrayDecayOperand(const Expr *E) {
3350 // If this isn't just an array->pointer decay, bail out.
3351 const auto *CE = dyn_cast<CastExpr>(E);
3352 if (!CE || CE->getCastKind() != CK_ArrayToPointerDecay)
3353 return nullptr;
3354
3355 // If this is a decay from variable width array, bail out.
3356 const Expr *SubExpr = CE->getSubExpr();
3357 if (SubExpr->getType()->isVariableArrayType())
3358 return nullptr;
3359
3360 return SubExpr;
3361}
3362
3363static llvm::Value *emitArraySubscriptGEP(CodeGenFunction &CGF,
3364 llvm::Value *ptr,
3365 ArrayRef<llvm::Value*> indices,
3366 bool inbounds,
3367 bool signedIndices,
3368 SourceLocation loc,
3369 const llvm::Twine &name = "arrayidx") {
3370 if (inbounds) {
3371 return CGF.EmitCheckedInBoundsGEP(ptr, indices, signedIndices,
3372 CodeGenFunction::NotSubtraction, loc,
3373 name);
3374 } else {
3375 return CGF.Builder.CreateGEP(ptr, indices, name);
3376 }
3377}
3378
3379static CharUnits getArrayElementAlign(CharUnits arrayAlign,
3380 llvm::Value *idx,
3381 CharUnits eltSize) {
3382 // If we have a constant index, we can use the exact offset of the
3383 // element we're accessing.
3384 if (auto constantIdx = dyn_cast<llvm::ConstantInt>(idx)) {
3385 CharUnits offset = constantIdx->getZExtValue() * eltSize;
3386 return arrayAlign.alignmentAtOffset(offset);
3387
3388 // Otherwise, use the worst-case alignment for any element.
3389 } else {
3390 return arrayAlign.alignmentOfArrayElement(eltSize);
3391 }
3392}
3393
3394static QualType getFixedSizeElementType(const ASTContext &ctx,
3395 const VariableArrayType *vla) {
3396 QualType eltType;
3397 do {
3398 eltType = vla->getElementType();
3399 } while ((vla = ctx.getAsVariableArrayType(eltType)));
3400 return eltType;
3401}
3402
3403static Address emitArraySubscriptGEP(CodeGenFunction &CGF, Address addr,
3404 ArrayRef<llvm::Value *> indices,
3405 QualType eltType, bool inbounds,
3406 bool signedIndices, SourceLocation loc,
3407 QualType *arrayType = nullptr,
3408 const llvm::Twine &name = "arrayidx") {
3409 // All the indices except that last must be zero.
3410#ifndef NDEBUG
3411 for (auto idx : indices.drop_back())
3412 assert(isa<llvm::ConstantInt>(idx) &&((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3413, __PRETTY_FUNCTION__))
3413 cast<llvm::ConstantInt>(idx)->isZero())((isa<llvm::ConstantInt>(idx) && cast<llvm::
ConstantInt>(idx)->isZero()) ? static_cast<void> (
0) : __assert_fail ("isa<llvm::ConstantInt>(idx) && cast<llvm::ConstantInt>(idx)->isZero()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3413, __PRETTY_FUNCTION__))
;
3414#endif
3415
3416 // Determine the element size of the statically-sized base. This is
3417 // the thing that the indices are expressed in terms of.
3418 if (auto vla = CGF.getContext().getAsVariableArrayType(eltType)) {
3419 eltType = getFixedSizeElementType(CGF.getContext(), vla);
3420 }
3421
3422 // We can use that to compute the best alignment of the element.
3423 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
3424 CharUnits eltAlign =
3425 getArrayElementAlign(addr.getAlignment(), indices.back(), eltSize);
3426
3427 llvm::Value *eltPtr;
3428 auto LastIndex = dyn_cast<llvm::ConstantInt>(indices.back());
3429 if (!CGF.IsInPreservedAIRegion || !LastIndex) {
3430 eltPtr = emitArraySubscriptGEP(
3431 CGF, addr.getPointer(), indices, inbounds, signedIndices,
3432 loc, name);
3433 } else {
3434 // Remember the original array subscript for bpf target
3435 unsigned idx = LastIndex->getZExtValue();
3436 llvm::DIType *DbgInfo = nullptr;
3437 if (arrayType)
3438 DbgInfo = CGF.getDebugInfo()->getOrCreateStandaloneType(*arrayType, loc);
3439 eltPtr = CGF.Builder.CreatePreserveArrayAccessIndex(addr.getPointer(),
3440 indices.size() - 1,
3441 idx, DbgInfo);
3442 }
3443
3444 return Address(eltPtr, eltAlign);
3445}
3446
3447LValue CodeGenFunction::EmitArraySubscriptExpr(const ArraySubscriptExpr *E,
3448 bool Accessed) {
3449 // The index must always be an integer, which is not an aggregate. Emit it
3450 // in lexical order (this complexity is, sadly, required by C++17).
3451 llvm::Value *IdxPre =
3452 (E->getLHS() == E->getIdx()) ? EmitScalarExpr(E->getIdx()) : nullptr;
3453 bool SignedIndices = false;
3454 auto EmitIdxAfterBase = [&, IdxPre](bool Promote) -> llvm::Value * {
3455 auto *Idx = IdxPre;
3456 if (E->getLHS() != E->getIdx()) {
3457 assert(E->getRHS() == E->getIdx() && "index was neither LHS nor RHS")((E->getRHS() == E->getIdx() && "index was neither LHS nor RHS"
) ? static_cast<void> (0) : __assert_fail ("E->getRHS() == E->getIdx() && \"index was neither LHS nor RHS\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3457, __PRETTY_FUNCTION__))
;
3458 Idx = EmitScalarExpr(E->getIdx());
3459 }
3460
3461 QualType IdxTy = E->getIdx()->getType();
3462 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
3463 SignedIndices |= IdxSigned;
3464
3465 if (SanOpts.has(SanitizerKind::ArrayBounds))
3466 EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, Accessed);
3467
3468 // Extend or truncate the index type to 32 or 64-bits.
3469 if (Promote && Idx->getType() != IntPtrTy)
3470 Idx = Builder.CreateIntCast(Idx, IntPtrTy, IdxSigned, "idxprom");
3471
3472 return Idx;
3473 };
3474 IdxPre = nullptr;
3475
3476 // If the base is a vector type, then we are forming a vector element lvalue
3477 // with this subscript.
3478 if (E->getBase()->getType()->isVectorType() &&
3479 !isa<ExtVectorElementExpr>(E->getBase())) {
3480 // Emit the vector as an lvalue to get its address.
3481 LValue LHS = EmitLValue(E->getBase());
3482 auto *Idx = EmitIdxAfterBase(/*Promote*/false);
3483 assert(LHS.isSimple() && "Can only subscript lvalue vectors here!")((LHS.isSimple() && "Can only subscript lvalue vectors here!"
) ? static_cast<void> (0) : __assert_fail ("LHS.isSimple() && \"Can only subscript lvalue vectors here!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3483, __PRETTY_FUNCTION__))
;
3484 return LValue::MakeVectorElt(LHS.getAddress(), Idx, E->getBase()->getType(),
3485 LHS.getBaseInfo(), TBAAAccessInfo());
3486 }
3487
3488 // All the other cases basically behave like simple offsetting.
3489
3490 // Handle the extvector case we ignored above.
3491 if (isa<ExtVectorElementExpr>(E->getBase())) {
3492 LValue LV = EmitLValue(E->getBase());
3493 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3494 Address Addr = EmitExtVectorElementLValue(LV);
3495
3496 QualType EltType = LV.getType()->castAs<VectorType>()->getElementType();
3497 Addr = emitArraySubscriptGEP(*this, Addr, Idx, EltType, /*inbounds*/ true,
3498 SignedIndices, E->getExprLoc());
3499 return MakeAddrLValue(Addr, EltType, LV.getBaseInfo(),
3500 CGM.getTBAAInfoForSubobject(LV, EltType));
3501 }
3502
3503 LValueBaseInfo EltBaseInfo;
3504 TBAAAccessInfo EltTBAAInfo;
3505 Address Addr = Address::invalid();
3506 if (const VariableArrayType *vla =
3507 getContext().getAsVariableArrayType(E->getType())) {
3508 // The base must be a pointer, which is not an aggregate. Emit
3509 // it. It needs to be emitted first in case it's what captures
3510 // the VLA bounds.
3511 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3512 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3513
3514 // The element count here is the total number of non-VLA elements.
3515 llvm::Value *numElements = getVLASize(vla).NumElts;
3516
3517 // Effectively, the multiply by the VLA size is part of the GEP.
3518 // GEP indexes are signed, and scaling an index isn't permitted to
3519 // signed-overflow, so we use the same semantics for our explicit
3520 // multiply. We suppress this if overflow is not undefined behavior.
3521 if (getLangOpts().isSignedOverflowDefined()) {
3522 Idx = Builder.CreateMul(Idx, numElements);
3523 } else {
3524 Idx = Builder.CreateNSWMul(Idx, numElements);
3525 }
3526
3527 Addr = emitArraySubscriptGEP(*this, Addr, Idx, vla->getElementType(),
3528 !getLangOpts().isSignedOverflowDefined(),
3529 SignedIndices, E->getExprLoc());
3530
3531 } else if (const ObjCObjectType *OIT = E->getType()->getAs<ObjCObjectType>()){
3532 // Indexing over an interface, as in "NSString *P; P[4];"
3533
3534 // Emit the base pointer.
3535 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3536 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3537
3538 CharUnits InterfaceSize = getContext().getTypeSizeInChars(OIT);
3539 llvm::Value *InterfaceSizeVal =
3540 llvm::ConstantInt::get(Idx->getType(), InterfaceSize.getQuantity());
3541
3542 llvm::Value *ScaledIdx = Builder.CreateMul(Idx, InterfaceSizeVal);
3543
3544 // We don't necessarily build correct LLVM struct types for ObjC
3545 // interfaces, so we can't rely on GEP to do this scaling
3546 // correctly, so we need to cast to i8*. FIXME: is this actually
3547 // true? A lot of other things in the fragile ABI would break...
3548 llvm::Type *OrigBaseTy = Addr.getType();
3549 Addr = Builder.CreateElementBitCast(Addr, Int8Ty);
3550
3551 // Do the GEP.
3552 CharUnits EltAlign =
3553 getArrayElementAlign(Addr.getAlignment(), Idx, InterfaceSize);
3554 llvm::Value *EltPtr =
3555 emitArraySubscriptGEP(*this, Addr.getPointer(), ScaledIdx, false,
3556 SignedIndices, E->getExprLoc());
3557 Addr = Address(EltPtr, EltAlign);
3558
3559 // Cast back.
3560 Addr = Builder.CreateBitCast(Addr, OrigBaseTy);
3561 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3562 // If this is A[i] where A is an array, the frontend will have decayed the
3563 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3564 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3565 // "gep x, i" here. Emit one "gep A, 0, i".
3566 assert(Array->getType()->isArrayType() &&((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3567, __PRETTY_FUNCTION__))
3567 "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3567, __PRETTY_FUNCTION__))
;
3568 LValue ArrayLV;
3569 // For simple multidimensional array indexing, set the 'accessed' flag for
3570 // better bounds-checking of the base expression.
3571 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3572 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3573 else
3574 ArrayLV = EmitLValue(Array);
3575 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3576
3577 // Propagate the alignment from the array itself to the result.
3578 QualType arrayType = Array->getType();
3579 Addr = emitArraySubscriptGEP(
3580 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3581 E->getType(), !getLangOpts().isSignedOverflowDefined(), SignedIndices,
3582 E->getExprLoc(), &arrayType);
3583 EltBaseInfo = ArrayLV.getBaseInfo();
3584 EltTBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, E->getType());
3585 } else {
3586 // The base must be a pointer; emit it with an estimate of its alignment.
3587 Addr = EmitPointerWithAlignment(E->getBase(), &EltBaseInfo, &EltTBAAInfo);
3588 auto *Idx = EmitIdxAfterBase(/*Promote*/true);
3589 QualType ptrType = E->getBase()->getType();
3590 Addr = emitArraySubscriptGEP(*this, Addr, Idx, E->getType(),
3591 !getLangOpts().isSignedOverflowDefined(),
3592 SignedIndices, E->getExprLoc(), &ptrType);
3593 }
3594
3595 LValue LV = MakeAddrLValue(Addr, E->getType(), EltBaseInfo, EltTBAAInfo);
3596
3597 if (getLangOpts().ObjC &&
3598 getLangOpts().getGC() != LangOptions::NonGC) {
3599 LV.setNonGC(!E->isOBJCGCCandidate(getContext()));
3600 setObjCGCLValueClass(getContext(), E, LV);
3601 }
3602 return LV;
3603}
3604
3605static Address emitOMPArraySectionBase(CodeGenFunction &CGF, const Expr *Base,
3606 LValueBaseInfo &BaseInfo,
3607 TBAAAccessInfo &TBAAInfo,
3608 QualType BaseTy, QualType ElTy,
3609 bool IsLowerBound) {
3610 LValue BaseLVal;
3611 if (auto *ASE = dyn_cast<OMPArraySectionExpr>(Base->IgnoreParenImpCasts())) {
3612 BaseLVal = CGF.EmitOMPArraySectionExpr(ASE, IsLowerBound);
3613 if (BaseTy->isArrayType()) {
3614 Address Addr = BaseLVal.getAddress();
3615 BaseInfo = BaseLVal.getBaseInfo();
3616
3617 // If the array type was an incomplete type, we need to make sure
3618 // the decay ends up being the right type.
3619 llvm::Type *NewTy = CGF.ConvertType(BaseTy);
3620 Addr = CGF.Builder.CreateElementBitCast(Addr, NewTy);
3621
3622 // Note that VLA pointers are always decayed, so we don't need to do
3623 // anything here.
3624 if (!BaseTy->isVariableArrayType()) {
3625 assert(isa<llvm::ArrayType>(Addr.getElementType()) &&((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3626, __PRETTY_FUNCTION__))
3626 "Expected pointer to array")((isa<llvm::ArrayType>(Addr.getElementType()) &&
"Expected pointer to array") ? static_cast<void> (0) :
__assert_fail ("isa<llvm::ArrayType>(Addr.getElementType()) && \"Expected pointer to array\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3626, __PRETTY_FUNCTION__))
;
3627 Addr = CGF.Builder.CreateConstArrayGEP(Addr, 0, "arraydecay");
3628 }
3629
3630 return CGF.Builder.CreateElementBitCast(Addr,
3631 CGF.ConvertTypeForMem(ElTy));
3632 }
3633 LValueBaseInfo TypeBaseInfo;
3634 TBAAAccessInfo TypeTBAAInfo;
3635 CharUnits Align = CGF.getNaturalTypeAlignment(ElTy, &TypeBaseInfo,
3636 &TypeTBAAInfo);
3637 BaseInfo.mergeForCast(TypeBaseInfo);
3638 TBAAInfo = CGF.CGM.mergeTBAAInfoForCast(TBAAInfo, TypeTBAAInfo);
3639 return Address(CGF.Builder.CreateLoad(BaseLVal.getAddress()), Align);
3640 }
3641 return CGF.EmitPointerWithAlignment(Base, &BaseInfo, &TBAAInfo);
3642}
3643
3644LValue CodeGenFunction::EmitOMPArraySectionExpr(const OMPArraySectionExpr *E,
3645 bool IsLowerBound) {
3646 QualType BaseTy = OMPArraySectionExpr::getBaseOriginalType(E->getBase());
3647 QualType ResultExprTy;
3648 if (auto *AT = getContext().getAsArrayType(BaseTy))
3649 ResultExprTy = AT->getElementType();
3650 else
3651 ResultExprTy = BaseTy->getPointeeType();
3652 llvm::Value *Idx = nullptr;
3653 if (IsLowerBound || E->getColonLoc().isInvalid()) {
3654 // Requesting lower bound or upper bound, but without provided length and
3655 // without ':' symbol for the default length -> length = 1.
3656 // Idx = LowerBound ?: 0;
3657 if (auto *LowerBound = E->getLowerBound()) {
3658 Idx = Builder.CreateIntCast(
3659 EmitScalarExpr(LowerBound), IntPtrTy,
3660 LowerBound->getType()->hasSignedIntegerRepresentation());
3661 } else
3662 Idx = llvm::ConstantInt::getNullValue(IntPtrTy);
3663 } else {
3664 // Try to emit length or lower bound as constant. If this is possible, 1
3665 // is subtracted from constant length or lower bound. Otherwise, emit LLVM
3666 // IR (LB + Len) - 1.
3667 auto &C = CGM.getContext();
3668 auto *Length = E->getLength();
3669 llvm::APSInt ConstLength;
3670 if (Length) {
3671 // Idx = LowerBound + Length - 1;
3672 if (Length->isIntegerConstantExpr(ConstLength, C)) {
3673 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3674 Length = nullptr;
3675 }
3676 auto *LowerBound = E->getLowerBound();
3677 llvm::APSInt ConstLowerBound(PointerWidthInBits, /*isUnsigned=*/false);
3678 if (LowerBound && LowerBound->isIntegerConstantExpr(ConstLowerBound, C)) {
3679 ConstLowerBound = ConstLowerBound.zextOrTrunc(PointerWidthInBits);
3680 LowerBound = nullptr;
3681 }
3682 if (!Length)
3683 --ConstLength;
3684 else if (!LowerBound)
3685 --ConstLowerBound;
3686
3687 if (Length || LowerBound) {
3688 auto *LowerBoundVal =
3689 LowerBound
3690 ? Builder.CreateIntCast(
3691 EmitScalarExpr(LowerBound), IntPtrTy,
3692 LowerBound->getType()->hasSignedIntegerRepresentation())
3693 : llvm::ConstantInt::get(IntPtrTy, ConstLowerBound);
3694 auto *LengthVal =
3695 Length
3696 ? Builder.CreateIntCast(
3697 EmitScalarExpr(Length), IntPtrTy,
3698 Length->getType()->hasSignedIntegerRepresentation())
3699 : llvm::ConstantInt::get(IntPtrTy, ConstLength);
3700 Idx = Builder.CreateAdd(LowerBoundVal, LengthVal, "lb_add_len",
3701 /*HasNUW=*/false,
3702 !getLangOpts().isSignedOverflowDefined());
3703 if (Length && LowerBound) {
3704 Idx = Builder.CreateSub(
3705 Idx, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "idx_sub_1",
3706 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3707 }
3708 } else
3709 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength + ConstLowerBound);
3710 } else {
3711 // Idx = ArraySize - 1;
3712 QualType ArrayTy = BaseTy->isPointerType()
3713 ? E->getBase()->IgnoreParenImpCasts()->getType()
3714 : BaseTy;
3715 if (auto *VAT = C.getAsVariableArrayType(ArrayTy)) {
3716 Length = VAT->getSizeExpr();
3717 if (Length->isIntegerConstantExpr(ConstLength, C))
3718 Length = nullptr;
3719 } else {
3720 auto *CAT = C.getAsConstantArrayType(ArrayTy);
3721 ConstLength = CAT->getSize();
3722 }
3723 if (Length) {
3724 auto *LengthVal = Builder.CreateIntCast(
3725 EmitScalarExpr(Length), IntPtrTy,
3726 Length->getType()->hasSignedIntegerRepresentation());
3727 Idx = Builder.CreateSub(
3728 LengthVal, llvm::ConstantInt::get(IntPtrTy, /*V=*/1), "len_sub_1",
3729 /*HasNUW=*/false, !getLangOpts().isSignedOverflowDefined());
3730 } else {
3731 ConstLength = ConstLength.zextOrTrunc(PointerWidthInBits);
3732 --ConstLength;
3733 Idx = llvm::ConstantInt::get(IntPtrTy, ConstLength);
3734 }
3735 }
3736 }
3737 assert(Idx)((Idx) ? static_cast<void> (0) : __assert_fail ("Idx", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3737, __PRETTY_FUNCTION__))
;
3738
3739 Address EltPtr = Address::invalid();
3740 LValueBaseInfo BaseInfo;
3741 TBAAAccessInfo TBAAInfo;
3742 if (auto *VLA = getContext().getAsVariableArrayType(ResultExprTy)) {
3743 // The base must be a pointer, which is not an aggregate. Emit
3744 // it. It needs to be emitted first in case it's what captures
3745 // the VLA bounds.
3746 Address Base =
3747 emitOMPArraySectionBase(*this, E->getBase(), BaseInfo, TBAAInfo,
3748 BaseTy, VLA->getElementType(), IsLowerBound);
3749 // The element count here is the total number of non-VLA elements.
3750 llvm::Value *NumElements = getVLASize(VLA).NumElts;
3751
3752 // Effectively, the multiply by the VLA size is part of the GEP.
3753 // GEP indexes are signed, and scaling an index isn't permitted to
3754 // signed-overflow, so we use the same semantics for our explicit
3755 // multiply. We suppress this if overflow is not undefined behavior.
3756 if (getLangOpts().isSignedOverflowDefined())
3757 Idx = Builder.CreateMul(Idx, NumElements);
3758 else
3759 Idx = Builder.CreateNSWMul(Idx, NumElements);
3760 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, VLA->getElementType(),
3761 !getLangOpts().isSignedOverflowDefined(),
3762 /*signedIndices=*/false, E->getExprLoc());
3763 } else if (const Expr *Array = isSimpleArrayDecayOperand(E->getBase())) {
3764 // If this is A[i] where A is an array, the frontend will have decayed the
3765 // base to be a ArrayToPointerDecay implicit cast. While correct, it is
3766 // inefficient at -O0 to emit a "gep A, 0, 0" when codegen'ing it, then a
3767 // "gep x, i" here. Emit one "gep A, 0, i".
3768 assert(Array->getType()->isArrayType() &&((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3769, __PRETTY_FUNCTION__))
3769 "Array to pointer decay must have array source type!")((Array->getType()->isArrayType() && "Array to pointer decay must have array source type!"
) ? static_cast<void> (0) : __assert_fail ("Array->getType()->isArrayType() && \"Array to pointer decay must have array source type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3769, __PRETTY_FUNCTION__))
;
3770 LValue ArrayLV;
3771 // For simple multidimensional array indexing, set the 'accessed' flag for
3772 // better bounds-checking of the base expression.
3773 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(Array))
3774 ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
3775 else
3776 ArrayLV = EmitLValue(Array);
3777
3778 // Propagate the alignment from the array itself to the result.
3779 EltPtr = emitArraySubscriptGEP(
3780 *this, ArrayLV.getAddress(), {CGM.getSize(CharUnits::Zero()), Idx},
3781 ResultExprTy, !getLangOpts().isSignedOverflowDefined(),
3782 /*signedIndices=*/false, E->getExprLoc());
3783 BaseInfo = ArrayLV.getBaseInfo();
3784 TBAAInfo = CGM.getTBAAInfoForSubobject(ArrayLV, ResultExprTy);
3785 } else {
3786 Address Base = emitOMPArraySectionBase(*this, E->getBase(), BaseInfo,
3787 TBAAInfo, BaseTy, ResultExprTy,
3788 IsLowerBound);
3789 EltPtr = emitArraySubscriptGEP(*this, Base, Idx, ResultExprTy,
3790 !getLangOpts().isSignedOverflowDefined(),
3791 /*signedIndices=*/false, E->getExprLoc());
3792 }
3793
3794 return MakeAddrLValue(EltPtr, ResultExprTy, BaseInfo, TBAAInfo);
3795}
3796
3797LValue CodeGenFunction::
3798EmitExtVectorElementExpr(const ExtVectorElementExpr *E) {
3799 // Emit the base vector as an l-value.
3800 LValue Base;
3801
3802 // ExtVectorElementExpr's base can either be a vector or pointer to vector.
3803 if (E->isArrow()) {
3804 // If it is a pointer to a vector, emit the address and form an lvalue with
3805 // it.
3806 LValueBaseInfo BaseInfo;
3807 TBAAAccessInfo TBAAInfo;
3808 Address Ptr = EmitPointerWithAlignment(E->getBase(), &BaseInfo, &TBAAInfo);
3809 const PointerType *PT = E->getBase()->getType()->getAs<PointerType>();
3810 Base = MakeAddrLValue(Ptr, PT->getPointeeType(), BaseInfo, TBAAInfo);
3811 Base.getQuals().removeObjCGCAttr();
3812 } else if (E->getBase()->isGLValue()) {
3813 // Otherwise, if the base is an lvalue ( as in the case of foo.x.x),
3814 // emit the base as an lvalue.
3815 assert(E->getBase()->getType()->isVectorType())((E->getBase()->getType()->isVectorType()) ? static_cast
<void> (0) : __assert_fail ("E->getBase()->getType()->isVectorType()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3815, __PRETTY_FUNCTION__))
;
3816 Base = EmitLValue(E->getBase());
3817 } else {
3818 // Otherwise, the base is a normal rvalue (as in (V+V).x), emit it as such.
3819 assert(E->getBase()->getType()->isVectorType() &&((E->getBase()->getType()->isVectorType() &&
"Result must be a vector") ? static_cast<void> (0) : __assert_fail
("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3820, __PRETTY_FUNCTION__))
3820 "Result must be a vector")((E->getBase()->getType()->isVectorType() &&
"Result must be a vector") ? static_cast<void> (0) : __assert_fail
("E->getBase()->getType()->isVectorType() && \"Result must be a vector\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3820, __PRETTY_FUNCTION__))
;
3821 llvm::Value *Vec = EmitScalarExpr(E->getBase());
3822
3823 // Store the vector to memory (because LValue wants an address).
3824 Address VecMem = CreateMemTemp(E->getBase()->getType());
3825 Builder.CreateStore(Vec, VecMem);
3826 Base = MakeAddrLValue(VecMem, E->getBase()->getType(),
3827 AlignmentSource::Decl);
3828 }
3829
3830 QualType type =
3831 E->getType().withCVRQualifiers(Base.getQuals().getCVRQualifiers());
3832
3833 // Encode the element access list into a vector of unsigned indices.
3834 SmallVector<uint32_t, 4> Indices;
3835 E->getEncodedElementAccess(Indices);
3836
3837 if (Base.isSimple()) {
3838 llvm::Constant *CV =
3839 llvm::ConstantDataVector::get(getLLVMContext(), Indices);
3840 return LValue::MakeExtVectorElt(Base.getAddress(), CV, type,
3841 Base.getBaseInfo(), TBAAAccessInfo());
3842 }
3843 assert(Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!")((Base.isExtVectorElt() && "Can only subscript lvalue vec elts here!"
) ? static_cast<void> (0) : __assert_fail ("Base.isExtVectorElt() && \"Can only subscript lvalue vec elts here!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3843, __PRETTY_FUNCTION__))
;
3844
3845 llvm::Constant *BaseElts = Base.getExtVectorElts();
3846 SmallVector<llvm::Constant *, 4> CElts;
3847
3848 for (unsigned i = 0, e = Indices.size(); i != e; ++i)
3849 CElts.push_back(BaseElts->getAggregateElement(Indices[i]));
3850 llvm::Constant *CV = llvm::ConstantVector::get(CElts);
3851 return LValue::MakeExtVectorElt(Base.getExtVectorAddress(), CV, type,
3852 Base.getBaseInfo(), TBAAAccessInfo());
3853}
3854
3855LValue CodeGenFunction::EmitMemberExpr(const MemberExpr *E) {
3856 if (DeclRefExpr *DRE = tryToConvertMemberExprToDeclRefExpr(*this, E)) {
3857 EmitIgnoredExpr(E->getBase());
3858 return EmitDeclRefLValue(DRE);
3859 }
3860
3861 Expr *BaseExpr = E->getBase();
3862 // If this is s.x, emit s as an lvalue. If it is s->x, emit s as a scalar.
3863 LValue BaseLV;
3864 if (E->isArrow()) {
3865 LValueBaseInfo BaseInfo;
3866 TBAAAccessInfo TBAAInfo;
3867 Address Addr = EmitPointerWithAlignment(BaseExpr, &BaseInfo, &TBAAInfo);
3868 QualType PtrTy = BaseExpr->getType()->getPointeeType();
3869 SanitizerSet SkippedChecks;
3870 bool IsBaseCXXThis = IsWrappedCXXThis(BaseExpr);
3871 if (IsBaseCXXThis)
3872 SkippedChecks.set(SanitizerKind::Alignment, true);
3873 if (IsBaseCXXThis || isa<DeclRefExpr>(BaseExpr))
3874 SkippedChecks.set(SanitizerKind::Null, true);
3875 EmitTypeCheck(TCK_MemberAccess, E->getExprLoc(), Addr.getPointer(), PtrTy,
3876 /*Alignment=*/CharUnits::Zero(), SkippedChecks);
3877 BaseLV = MakeAddrLValue(Addr, PtrTy, BaseInfo, TBAAInfo);
3878 } else
3879 BaseLV = EmitCheckedLValue(BaseExpr, TCK_MemberAccess);
3880
3881 NamedDecl *ND = E->getMemberDecl();
3882 if (auto *Field = dyn_cast<FieldDecl>(ND)) {
3883 LValue LV = EmitLValueForField(BaseLV, Field);
3884 setObjCGCLValueClass(getContext(), E, LV);
3885 return LV;
3886 }
3887
3888 if (const auto *FD = dyn_cast<FunctionDecl>(ND))
3889 return EmitFunctionDeclLValue(*this, E, FD);
3890
3891 llvm_unreachable("Unhandled member declaration!")::llvm::llvm_unreachable_internal("Unhandled member declaration!"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3891)
;
3892}
3893
3894/// Given that we are currently emitting a lambda, emit an l-value for
3895/// one of its members.
3896LValue CodeGenFunction::EmitLValueForLambdaField(const FieldDecl *Field) {
3897 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda())((cast<CXXMethodDecl>(CurCodeDecl)->getParent()->
isLambda()) ? static_cast<void> (0) : __assert_fail ("cast<CXXMethodDecl>(CurCodeDecl)->getParent()->isLambda()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3897, __PRETTY_FUNCTION__))
;
3898 assert(cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent())((cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field
->getParent()) ? static_cast<void> (0) : __assert_fail
("cast<CXXMethodDecl>(CurCodeDecl)->getParent() == Field->getParent()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 3898, __PRETTY_FUNCTION__))
;
3899 QualType LambdaTagType =
3900 getContext().getTagDeclType(Field->getParent());
3901 LValue LambdaLV = MakeNaturalAlignAddrLValue(CXXABIThisValue, LambdaTagType);
3902 return EmitLValueForField(LambdaLV, Field);
3903}
3904
3905/// Get the field index in the debug info. The debug info structure/union
3906/// will ignore the unnamed bitfields.
3907unsigned CodeGenFunction::getDebugInfoFIndex(const RecordDecl *Rec,
3908 unsigned FieldIndex) {
3909 unsigned I = 0, Skipped = 0;
3910
3911 for (auto F : Rec->getDefinition()->fields()) {
3912 if (I == FieldIndex)
3913 break;
3914 if (F->isUnnamedBitfield())
3915 Skipped++;
3916 I++;
3917 }
3918
3919 return FieldIndex - Skipped;
3920}
3921
3922/// Get the address of a zero-sized field within a record. The resulting
3923/// address doesn't necessarily have the right type.
3924static Address emitAddrOfZeroSizeField(CodeGenFunction &CGF, Address Base,
3925 const FieldDecl *Field) {
3926 CharUnits Offset = CGF.getContext().toCharUnitsFromBits(
3927 CGF.getContext().getFieldOffset(Field));
3928 if (Offset.isZero())
3929 return Base;
3930 Base = CGF.Builder.CreateElementBitCast(Base, CGF.Int8Ty);
3931 return CGF.Builder.CreateConstInBoundsByteGEP(Base, Offset);
3932}
3933
3934/// Drill down to the storage of a field without walking into
3935/// reference types.
3936///
3937/// The resulting address doesn't necessarily have the right type.
3938static Address emitAddrOfFieldStorage(CodeGenFunction &CGF, Address base,
3939 const FieldDecl *field) {
3940 if (field->isZeroSize(CGF.getContext()))
3941 return emitAddrOfZeroSizeField(CGF, base, field);
3942
3943 const RecordDecl *rec = field->getParent();
3944
3945 unsigned idx =
3946 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
3947
3948 return CGF.Builder.CreateStructGEP(base, idx, field->getName());
3949}
3950
3951static Address emitPreserveStructAccess(CodeGenFunction &CGF, Address base,
3952 const FieldDecl *field) {
3953 const RecordDecl *rec = field->getParent();
3954 llvm::DIType *DbgInfo = CGF.getDebugInfo()->getOrCreateRecordType(
3955 CGF.getContext().getRecordType(rec), rec->getLocation());
3956
3957 unsigned idx =
3958 CGF.CGM.getTypes().getCGRecordLayout(rec).getLLVMFieldNo(field);
3959
3960 return CGF.Builder.CreatePreserveStructAccessIndex(
3961 base, idx, CGF.getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo);
3962}
3963
3964static bool hasAnyVptr(const QualType Type, const ASTContext &Context) {
3965 const auto *RD = Type.getTypePtr()->getAsCXXRecordDecl();
3966 if (!RD)
3967 return false;
3968
3969 if (RD->isDynamicClass())
3970 return true;
3971
3972 for (const auto &Base : RD->bases())
3973 if (hasAnyVptr(Base.getType(), Context))
3974 return true;
3975
3976 for (const FieldDecl *Field : RD->fields())
3977 if (hasAnyVptr(Field->getType(), Context))
3978 return true;
3979
3980 return false;
3981}
3982
3983LValue CodeGenFunction::EmitLValueForField(LValue base,
3984 const FieldDecl *field) {
3985 LValueBaseInfo BaseInfo = base.getBaseInfo();
3986
3987 if (field->isBitField()) {
3988 const CGRecordLayout &RL =
3989 CGM.getTypes().getCGRecordLayout(field->getParent());
3990 const CGBitFieldInfo &Info = RL.getBitFieldInfo(field);
3991 Address Addr = base.getAddress();
3992 unsigned Idx = RL.getLLVMFieldNo(field);
3993 if (!IsInPreservedAIRegion) {
3994 if (Idx != 0)
3995 // For structs, we GEP to the field that the record layout suggests.
3996 Addr = Builder.CreateStructGEP(Addr, Idx, field->getName());
3997 } else {
3998 const RecordDecl *rec = field->getParent();
3999 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4000 getContext().getRecordType(rec), rec->getLocation());
4001 Addr = Builder.CreatePreserveStructAccessIndex(Addr, Idx,
4002 getDebugInfoFIndex(rec, field->getFieldIndex()),
4003 DbgInfo);
4004 }
4005
4006 // Get the access type.
4007 llvm::Type *FieldIntTy =
4008 llvm::Type::getIntNTy(getLLVMContext(), Info.StorageSize);
4009 if (Addr.getElementType() != FieldIntTy)
4010 Addr = Builder.CreateElementBitCast(Addr, FieldIntTy);
4011
4012 QualType fieldType =
4013 field->getType().withCVRQualifiers(base.getVRQualifiers());
4014 // TODO: Support TBAA for bit fields.
4015 LValueBaseInfo FieldBaseInfo(BaseInfo.getAlignmentSource());
4016 return LValue::MakeBitfield(Addr, Info, fieldType, FieldBaseInfo,
4017 TBAAAccessInfo());
4018 }
4019
4020 // Fields of may-alias structures are may-alias themselves.
4021 // FIXME: this should get propagated down through anonymous structs
4022 // and unions.
4023 QualType FieldType = field->getType();
4024 const RecordDecl *rec = field->getParent();
4025 AlignmentSource BaseAlignSource = BaseInfo.getAlignmentSource();
4026 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(BaseAlignSource));
4027 TBAAAccessInfo FieldTBAAInfo;
4028 if (base.getTBAAInfo().isMayAlias() ||
4029 rec->hasAttr<MayAliasAttr>() || FieldType->isVectorType()) {
4030 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4031 } else if (rec->isUnion()) {
4032 // TODO: Support TBAA for unions.
4033 FieldTBAAInfo = TBAAAccessInfo::getMayAliasInfo();
4034 } else {
4035 // If no base type been assigned for the base access, then try to generate
4036 // one for this base lvalue.
4037 FieldTBAAInfo = base.getTBAAInfo();
4038 if (!FieldTBAAInfo.BaseType) {
4039 FieldTBAAInfo.BaseType = CGM.getTBAABaseTypeInfo(base.getType());
4040 assert(!FieldTBAAInfo.Offset &&((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4041, __PRETTY_FUNCTION__))
4041 "Nonzero offset for an access with no base type!")((!FieldTBAAInfo.Offset && "Nonzero offset for an access with no base type!"
) ? static_cast<void> (0) : __assert_fail ("!FieldTBAAInfo.Offset && \"Nonzero offset for an access with no base type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4041, __PRETTY_FUNCTION__))
;
4042 }
4043
4044 // Adjust offset to be relative to the base type.
4045 const ASTRecordLayout &Layout =
4046 getContext().getASTRecordLayout(field->getParent());
4047 unsigned CharWidth = getContext().getCharWidth();
4048 if (FieldTBAAInfo.BaseType)
4049 FieldTBAAInfo.Offset +=
4050 Layout.getFieldOffset(field->getFieldIndex()) / CharWidth;
4051
4052 // Update the final access type and size.
4053 FieldTBAAInfo.AccessType = CGM.getTBAATypeInfo(FieldType);
4054 FieldTBAAInfo.Size =
4055 getContext().getTypeSizeInChars(FieldType).getQuantity();
4056 }
4057
4058 Address addr = base.getAddress();
4059 if (auto *ClassDef = dyn_cast<CXXRecordDecl>(rec)) {
4060 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4061 ClassDef->isDynamicClass()) {
4062 // Getting to any field of dynamic object requires stripping dynamic
4063 // information provided by invariant.group. This is because accessing
4064 // fields may leak the real address of dynamic object, which could result
4065 // in miscompilation when leaked pointer would be compared.
4066 auto *stripped = Builder.CreateStripInvariantGroup(addr.getPointer());
4067 addr = Address(stripped, addr.getAlignment());
4068 }
4069 }
4070
4071 unsigned RecordCVR = base.getVRQualifiers();
4072 if (rec->isUnion()) {
4073 // For unions, there is no pointer adjustment.
4074 if (CGM.getCodeGenOpts().StrictVTablePointers &&
4075 hasAnyVptr(FieldType, getContext()))
4076 // Because unions can easily skip invariant.barriers, we need to add
4077 // a barrier every time CXXRecord field with vptr is referenced.
4078 addr = Address(Builder.CreateLaunderInvariantGroup(addr.getPointer()),
4079 addr.getAlignment());
4080
4081 if (IsInPreservedAIRegion) {
4082 // Remember the original union field index
4083 llvm::DIType *DbgInfo = getDebugInfo()->getOrCreateRecordType(
4084 getContext().getRecordType(rec), rec->getLocation());
4085 addr = Address(
4086 Builder.CreatePreserveUnionAccessIndex(
4087 addr.getPointer(), getDebugInfoFIndex(rec, field->getFieldIndex()), DbgInfo),
4088 addr.getAlignment());
4089 }
4090
4091 if (FieldType->isReferenceType())
4092 addr = Builder.CreateElementBitCast(
4093 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4094 } else {
4095 if (!IsInPreservedAIRegion)
4096 // For structs, we GEP to the field that the record layout suggests.
4097 addr = emitAddrOfFieldStorage(*this, addr, field);
4098 else
4099 // Remember the original struct field index
4100 addr = emitPreserveStructAccess(*this, addr, field);
4101 }
4102
4103 // If this is a reference field, load the reference right now.
4104 if (FieldType->isReferenceType()) {
4105 LValue RefLVal =
4106 MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4107 if (RecordCVR & Qualifiers::Volatile)
4108 RefLVal.getQuals().addVolatile();
4109 addr = EmitLoadOfReference(RefLVal, &FieldBaseInfo, &FieldTBAAInfo);
4110
4111 // Qualifiers on the struct don't apply to the referencee.
4112 RecordCVR = 0;
4113 FieldType = FieldType->getPointeeType();
4114 }
4115
4116 // Make sure that the address is pointing to the right type. This is critical
4117 // for both unions and structs. A union needs a bitcast, a struct element
4118 // will need a bitcast if the LLVM type laid out doesn't match the desired
4119 // type.
4120 addr = Builder.CreateElementBitCast(
4121 addr, CGM.getTypes().ConvertTypeForMem(FieldType), field->getName());
4122
4123 if (field->hasAttr<AnnotateAttr>())
4124 addr = EmitFieldAnnotations(field, addr);
4125
4126 LValue LV = MakeAddrLValue(addr, FieldType, FieldBaseInfo, FieldTBAAInfo);
4127 LV.getQuals().addCVRQualifiers(RecordCVR);
4128
4129 // __weak attribute on a field is ignored.
4130 if (LV.getQuals().getObjCGCAttr() == Qualifiers::Weak)
4131 LV.getQuals().removeObjCGCAttr();
4132
4133 return LV;
4134}
4135
4136LValue
4137CodeGenFunction::EmitLValueForFieldInitialization(LValue Base,
4138 const FieldDecl *Field) {
4139 QualType FieldType = Field->getType();
4140
4141 if (!FieldType->isReferenceType())
4142 return EmitLValueForField(Base, Field);
4143
4144 Address V = emitAddrOfFieldStorage(*this, Base.getAddress(), Field);
4145
4146 // Make sure that the address is pointing to the right type.
4147 llvm::Type *llvmType = ConvertTypeForMem(FieldType);
4148 V = Builder.CreateElementBitCast(V, llvmType, Field->getName());
4149
4150 // TODO: Generate TBAA information that describes this access as a structure
4151 // member access and not just an access to an object of the field's type. This
4152 // should be similar to what we do in EmitLValueForField().
4153 LValueBaseInfo BaseInfo = Base.getBaseInfo();
4154 AlignmentSource FieldAlignSource = BaseInfo.getAlignmentSource();
4155 LValueBaseInfo FieldBaseInfo(getFieldAlignmentSource(FieldAlignSource));
4156 return MakeAddrLValue(V, FieldType, FieldBaseInfo,
4157 CGM.getTBAAInfoForSubobject(Base, FieldType));
4158}
4159
4160LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
4161 if (E->isFileScope()) {
4162 ConstantAddress GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
4163 return MakeAddrLValue(GlobalPtr, E->getType(), AlignmentSource::Decl);
4164 }
4165 if (E->getType()->isVariablyModifiedType())
4166 // make sure to emit the VLA size.
4167 EmitVariablyModifiedType(E->getType());
4168
4169 Address DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
4170 const Expr *InitExpr = E->getInitializer();
4171 LValue Result = MakeAddrLValue(DeclPtr, E->getType(), AlignmentSource::Decl);
4172
4173 EmitAnyExprToMem(InitExpr, DeclPtr, E->getType().getQualifiers(),
4174 /*Init*/ true);
4175
4176 return Result;
4177}
4178
4179LValue CodeGenFunction::EmitInitListLValue(const InitListExpr *E) {
4180 if (!E->isGLValue())
4181 // Initializing an aggregate temporary in C++11: T{...}.
4182 return EmitAggExprToLValue(E);
4183
4184 // An lvalue initializer list must be initializing a reference.
4185 assert(E->isTransparent() && "non-transparent glvalue init list")((E->isTransparent() && "non-transparent glvalue init list"
) ? static_cast<void> (0) : __assert_fail ("E->isTransparent() && \"non-transparent glvalue init list\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4185, __PRETTY_FUNCTION__))
;
4186 return EmitLValue(E->getInit(0));
4187}
4188
4189/// Emit the operand of a glvalue conditional operator. This is either a glvalue
4190/// or a (possibly-parenthesized) throw-expression. If this is a throw, no
4191/// LValue is returned and the current block has been terminated.
4192static Optional<LValue> EmitLValueOrThrowExpression(CodeGenFunction &CGF,
4193 const Expr *Operand) {
4194 if (auto *ThrowExpr = dyn_cast<CXXThrowExpr>(Operand->IgnoreParens())) {
4195 CGF.EmitCXXThrowExpr(ThrowExpr, /*KeepInsertionPoint*/false);
4196 return None;
4197 }
4198
4199 return CGF.EmitLValue(Operand);
4200}
4201
4202LValue CodeGenFunction::
4203EmitConditionalOperatorLValue(const AbstractConditionalOperator *expr) {
4204 if (!expr->isGLValue()) {
4205 // ?: here should be an aggregate.
4206 assert(hasAggregateEvaluationKind(expr->getType()) &&((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4207, __PRETTY_FUNCTION__))
4207 "Unexpected conditional operator!")((hasAggregateEvaluationKind(expr->getType()) && "Unexpected conditional operator!"
) ? static_cast<void> (0) : __assert_fail ("hasAggregateEvaluationKind(expr->getType()) && \"Unexpected conditional operator!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4207, __PRETTY_FUNCTION__))
;
4208 return EmitAggExprToLValue(expr);
4209 }
4210
4211 OpaqueValueMapping binding(*this, expr);
4212
4213 const Expr *condExpr = expr->getCond();
4214 bool CondExprBool;
4215 if (ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
4216 const Expr *live = expr->getTrueExpr(), *dead = expr->getFalseExpr();
4217 if (!CondExprBool) std::swap(live, dead);
4218
4219 if (!ContainsLabel(dead)) {
4220 // If the true case is live, we need to track its region.
4221 if (CondExprBool)
4222 incrementProfileCounter(expr);
4223 return EmitLValue(live);
4224 }
4225 }
4226
4227 llvm::BasicBlock *lhsBlock = createBasicBlock("cond.true");
4228 llvm::BasicBlock *rhsBlock = createBasicBlock("cond.false");
4229 llvm::BasicBlock *contBlock = createBasicBlock("cond.end");
4230
4231 ConditionalEvaluation eval(*this);
4232 EmitBranchOnBoolExpr(condExpr, lhsBlock, rhsBlock, getProfileCount(expr));
4233
4234 // Any temporaries created here are conditional.
4235 EmitBlock(lhsBlock);
4236 incrementProfileCounter(expr);
4237 eval.begin(*this);
4238 Optional<LValue> lhs =
4239 EmitLValueOrThrowExpression(*this, expr->getTrueExpr());
4240 eval.end(*this);
4241
4242 if (lhs && !lhs->isSimple())
4243 return EmitUnsupportedLValue(expr, "conditional operator");
4244
4245 lhsBlock = Builder.GetInsertBlock();
4246 if (lhs)
4247 Builder.CreateBr(contBlock);
4248
4249 // Any temporaries created here are conditional.
4250 EmitBlock(rhsBlock);
4251 eval.begin(*this);
4252 Optional<LValue> rhs =
4253 EmitLValueOrThrowExpression(*this, expr->getFalseExpr());
4254 eval.end(*this);
4255 if (rhs && !rhs->isSimple())
4256 return EmitUnsupportedLValue(expr, "conditional operator");
4257 rhsBlock = Builder.GetInsertBlock();
4258
4259 EmitBlock(contBlock);
4260
4261 if (lhs && rhs) {
4262 llvm::PHINode *phi = Builder.CreatePHI(lhs->getPointer()->getType(),
4263 2, "cond-lvalue");
4264 phi->addIncoming(lhs->getPointer(), lhsBlock);
4265 phi->addIncoming(rhs->getPointer(), rhsBlock);
4266 Address result(phi, std::min(lhs->getAlignment(), rhs->getAlignment()));
4267 AlignmentSource alignSource =
4268 std::max(lhs->getBaseInfo().getAlignmentSource(),
4269 rhs->getBaseInfo().getAlignmentSource());
4270 TBAAAccessInfo TBAAInfo = CGM.mergeTBAAInfoForConditionalOperator(
4271 lhs->getTBAAInfo(), rhs->getTBAAInfo());
4272 return MakeAddrLValue(result, expr->getType(), LValueBaseInfo(alignSource),
4273 TBAAInfo);
4274 } else {
4275 assert((lhs || rhs) &&(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4276, __PRETTY_FUNCTION__))
4276 "both operands of glvalue conditional are throw-expressions?")(((lhs || rhs) && "both operands of glvalue conditional are throw-expressions?"
) ? static_cast<void> (0) : __assert_fail ("(lhs || rhs) && \"both operands of glvalue conditional are throw-expressions?\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4276, __PRETTY_FUNCTION__))
;
4277 return lhs ? *lhs : *rhs;
4278 }
4279}
4280
4281/// EmitCastLValue - Casts are never lvalues unless that cast is to a reference
4282/// type. If the cast is to a reference, we can have the usual lvalue result,
4283/// otherwise if a cast is needed by the code generator in an lvalue context,
4284/// then it must mean that we need the address of an aggregate in order to
4285/// access one of its members. This can happen for all the reasons that casts
4286/// are permitted with aggregate result, including noop aggregate casts, and
4287/// cast from scalar to union.
4288LValue CodeGenFunction::EmitCastLValue(const CastExpr *E) {
4289 switch (E->getCastKind()) {
17
Control jumps to 'case CK_BaseToDerived:' at line 4383
4290 case CK_ToVoid:
4291 case CK_BitCast:
4292 case CK_LValueToRValueBitCast:
4293 case CK_ArrayToPointerDecay:
4294 case CK_FunctionToPointerDecay:
4295 case CK_NullToMemberPointer:
4296 case CK_NullToPointer:
4297 case CK_IntegralToPointer:
4298 case CK_PointerToIntegral:
4299 case CK_PointerToBoolean:
4300 case CK_VectorSplat:
4301 case CK_IntegralCast:
4302 case CK_BooleanToSignedIntegral:
4303 case CK_IntegralToBoolean:
4304 case CK_IntegralToFloating:
4305 case CK_FloatingToIntegral:
4306 case CK_FloatingToBoolean:
4307 case CK_FloatingCast:
4308 case CK_FloatingRealToComplex:
4309 case CK_FloatingComplexToReal:
4310 case CK_FloatingComplexToBoolean:
4311 case CK_FloatingComplexCast:
4312 case CK_FloatingComplexToIntegralComplex:
4313 case CK_IntegralRealToComplex:
4314 case CK_IntegralComplexToReal:
4315 case CK_IntegralComplexToBoolean:
4316 case CK_IntegralComplexCast:
4317 case CK_IntegralComplexToFloatingComplex:
4318 case CK_DerivedToBaseMemberPointer:
4319 case CK_BaseToDerivedMemberPointer:
4320 case CK_MemberPointerToBoolean:
4321 case CK_ReinterpretMemberPointer:
4322 case CK_AnyPointerToBlockPointerCast:
4323 case CK_ARCProduceObject:
4324 case CK_ARCConsumeObject:
4325 case CK_ARCReclaimReturnedObject:
4326 case CK_ARCExtendBlockObject:
4327 case CK_CopyAndAutoreleaseBlockObject:
4328 case CK_IntToOCLSampler:
4329 case CK_FixedPointCast:
4330 case CK_FixedPointToBoolean:
4331 case CK_FixedPointToIntegral:
4332 case CK_IntegralToFixedPoint:
4333 return EmitUnsupportedLValue(E, "unexpected cast lvalue");
4334
4335 case CK_Dependent:
4336 llvm_unreachable("dependent cast kind in IR gen!")::llvm::llvm_unreachable_internal("dependent cast kind in IR gen!"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4336)
;
4337
4338 case CK_BuiltinFnToFnPtr:
4339 llvm_unreachable("builtin functions are handled elsewhere")::llvm::llvm_unreachable_internal("builtin functions are handled elsewhere"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4339)
;
4340
4341 // These are never l-values; just use the aggregate emission code.
4342 case CK_NonAtomicToAtomic:
4343 case CK_AtomicToNonAtomic:
4344 return EmitAggExprToLValue(E);
4345
4346 case CK_Dynamic: {
4347 LValue LV = EmitLValue(E->getSubExpr());
4348 Address V = LV.getAddress();
4349 const auto *DCE = cast<CXXDynamicCastExpr>(E);
4350 return MakeNaturalAlignAddrLValue(EmitDynamicCast(V, DCE), E->getType());
4351 }
4352
4353 case CK_ConstructorConversion:
4354 case CK_UserDefinedConversion:
4355 case CK_CPointerToObjCPointerCast:
4356 case CK_BlockPointerToObjCPointerCast:
4357 case CK_NoOp:
4358 case CK_LValueToRValue:
4359 return EmitLValue(E->getSubExpr());
4360
4361 case CK_UncheckedDerivedToBase:
4362 case CK_DerivedToBase: {
4363 const RecordType *DerivedClassTy =
4364 E->getSubExpr()->getType()->getAs<RecordType>();
4365 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
4366
4367 LValue LV = EmitLValue(E->getSubExpr());
4368 Address This = LV.getAddress();
4369
4370 // Perform the derived-to-base conversion
4371 Address Base = GetAddressOfBaseClass(
4372 This, DerivedClassDecl, E->path_begin(), E->path_end(),
4373 /*NullCheckValue=*/false, E->getExprLoc());
4374
4375 // TODO: Support accesses to members of base classes in TBAA. For now, we
4376 // conservatively pretend that the complete object is of the base class
4377 // type.
4378 return MakeAddrLValue(Base, E->getType(), LV.getBaseInfo(),
4379 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4380 }
4381 case CK_ToUnion:
4382 return EmitAggExprToLValue(E);
4383 case CK_BaseToDerived: {
4384 const RecordType *DerivedClassTy = E->getType()->getAs<RecordType>();
18
Assuming the object is not a 'RecordType'
19
'DerivedClassTy' initialized to a null pointer value
4385 auto *DerivedClassDecl = cast<CXXRecordDecl>(DerivedClassTy->getDecl());
20
Called C++ object pointer is null
4386
4387 LValue LV = EmitLValue(E->getSubExpr());
4388
4389 // Perform the base-to-derived conversion
4390 Address Derived =
4391 GetAddressOfDerivedClass(LV.getAddress(), DerivedClassDecl,
4392 E->path_begin(), E->path_end(),
4393 /*NullCheckValue=*/false);
4394
4395 // C++11 [expr.static.cast]p2: Behavior is undefined if a downcast is
4396 // performed and the object is not of the derived type.
4397 if (sanitizePerformTypeCheck())
4398 EmitTypeCheck(TCK_DowncastReference, E->getExprLoc(),
4399 Derived.getPointer(), E->getType());
4400
4401 if (SanOpts.has(SanitizerKind::CFIDerivedCast))
4402 EmitVTablePtrCheckForCast(E->getType(), Derived.getPointer(),
4403 /*MayBeNull=*/false, CFITCK_DerivedCast,
4404 E->getBeginLoc());
4405
4406 return MakeAddrLValue(Derived, E->getType(), LV.getBaseInfo(),
4407 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4408 }
4409 case CK_LValueBitCast: {
4410 // This must be a reinterpret_cast (or c-style equivalent).
4411 const auto *CE = cast<ExplicitCastExpr>(E);
4412
4413 CGM.EmitExplicitCastExprType(CE, this);
4414 LValue LV = EmitLValue(E->getSubExpr());
4415 Address V = Builder.CreateBitCast(LV.getAddress(),
4416 ConvertType(CE->getTypeAsWritten()));
4417
4418 if (SanOpts.has(SanitizerKind::CFIUnrelatedCast))
4419 EmitVTablePtrCheckForCast(E->getType(), V.getPointer(),
4420 /*MayBeNull=*/false, CFITCK_UnrelatedCast,
4421 E->getBeginLoc());
4422
4423 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4424 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4425 }
4426 case CK_AddressSpaceConversion: {
4427 LValue LV = EmitLValue(E->getSubExpr());
4428 QualType DestTy = getContext().getPointerType(E->getType());
4429 llvm::Value *V = getTargetHooks().performAddrSpaceCast(
4430 *this, LV.getPointer(), E->getSubExpr()->getType().getAddressSpace(),
4431 E->getType().getAddressSpace(), ConvertType(DestTy));
4432 return MakeAddrLValue(Address(V, LV.getAddress().getAlignment()),
4433 E->getType(), LV.getBaseInfo(), LV.getTBAAInfo());
4434 }
4435 case CK_ObjCObjectLValueCast: {
4436 LValue LV = EmitLValue(E->getSubExpr());
4437 Address V = Builder.CreateElementBitCast(LV.getAddress(),
4438 ConvertType(E->getType()));
4439 return MakeAddrLValue(V, E->getType(), LV.getBaseInfo(),
4440 CGM.getTBAAInfoForSubobject(LV, E->getType()));
4441 }
4442 case CK_ZeroToOCLOpaqueType:
4443 llvm_unreachable("NULL to OpenCL opaque type lvalue cast is not valid")::llvm::llvm_unreachable_internal("NULL to OpenCL opaque type lvalue cast is not valid"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4443)
;
4444 }
4445
4446 llvm_unreachable("Unhandled lvalue cast kind?")::llvm::llvm_unreachable_internal("Unhandled lvalue cast kind?"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4446)
;
4447}
4448
4449LValue CodeGenFunction::EmitOpaqueValueLValue(const OpaqueValueExpr *e) {
4450 assert(OpaqueValueMappingData::shouldBindAsLValue(e))((OpaqueValueMappingData::shouldBindAsLValue(e)) ? static_cast
<void> (0) : __assert_fail ("OpaqueValueMappingData::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4450, __PRETTY_FUNCTION__))
;
4451 return getOrCreateOpaqueLValueMapping(e);
4452}
4453
4454LValue
4455CodeGenFunction::getOrCreateOpaqueLValueMapping(const OpaqueValueExpr *e) {
4456 assert(OpaqueValueMapping::shouldBindAsLValue(e))((OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4456, __PRETTY_FUNCTION__))
;
4457
4458 llvm::DenseMap<const OpaqueValueExpr*,LValue>::iterator
4459 it = OpaqueLValues.find(e);
4460
4461 if (it != OpaqueLValues.end())
4462 return it->second;
4463
4464 assert(e->isUnique() && "LValue for a nonunique OVE hasn't been emitted")((e->isUnique() && "LValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"LValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4464, __PRETTY_FUNCTION__))
;
4465 return EmitLValue(e->getSourceExpr());
4466}
4467
4468RValue
4469CodeGenFunction::getOrCreateOpaqueRValueMapping(const OpaqueValueExpr *e) {
4470 assert(!OpaqueValueMapping::shouldBindAsLValue(e))((!OpaqueValueMapping::shouldBindAsLValue(e)) ? static_cast<
void> (0) : __assert_fail ("!OpaqueValueMapping::shouldBindAsLValue(e)"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4470, __PRETTY_FUNCTION__))
;
4471
4472 llvm::DenseMap<const OpaqueValueExpr*,RValue>::iterator
4473 it = OpaqueRValues.find(e);
4474
4475 if (it != OpaqueRValues.end())
4476 return it->second;
4477
4478 assert(e->isUnique() && "RValue for a nonunique OVE hasn't been emitted")((e->isUnique() && "RValue for a nonunique OVE hasn't been emitted"
) ? static_cast<void> (0) : __assert_fail ("e->isUnique() && \"RValue for a nonunique OVE hasn't been emitted\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4478, __PRETTY_FUNCTION__))
;
4479 return EmitAnyExpr(e->getSourceExpr());
4480}
4481
4482RValue CodeGenFunction::EmitRValueForField(LValue LV,
4483 const FieldDecl *FD,
4484 SourceLocation Loc) {
4485 QualType FT = FD->getType();
4486 LValue FieldLV = EmitLValueForField(LV, FD);
4487 switch (getEvaluationKind(FT)) {
4488 case TEK_Complex:
4489 return RValue::getComplex(EmitLoadOfComplex(FieldLV, Loc));
4490 case TEK_Aggregate:
4491 return FieldLV.asAggregateRValue();
4492 case TEK_Scalar:
4493 // This routine is used to load fields one-by-one to perform a copy, so
4494 // don't load reference fields.
4495 if (FD->getType()->isReferenceType())
4496 return RValue::get(FieldLV.getPointer());
4497 return EmitLoadOfLValue(FieldLV, Loc);
4498 }
4499 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4499)
;
4500}
4501
4502//===--------------------------------------------------------------------===//
4503// Expression Emission
4504//===--------------------------------------------------------------------===//
4505
4506RValue CodeGenFunction::EmitCallExpr(const CallExpr *E,
4507 ReturnValueSlot ReturnValue) {
4508 // Builtins never have block type.
4509 if (E->getCallee()->getType()->isBlockPointerType())
4510 return EmitBlockCallExpr(E, ReturnValue);
4511
4512 if (const auto *CE = dyn_cast<CXXMemberCallExpr>(E))
4513 return EmitCXXMemberCallExpr(CE, ReturnValue);
4514
4515 if (const auto *CE = dyn_cast<CUDAKernelCallExpr>(E))
4516 return EmitCUDAKernelCallExpr(CE, ReturnValue);
4517
4518 if (const auto *CE = dyn_cast<CXXOperatorCallExpr>(E))
4519 if (const CXXMethodDecl *MD =
4520 dyn_cast_or_null<CXXMethodDecl>(CE->getCalleeDecl()))
4521 return EmitCXXOperatorMemberCallExpr(CE, MD, ReturnValue);
4522
4523 CGCallee callee = EmitCallee(E->getCallee());
4524
4525 if (callee.isBuiltin()) {
4526 return EmitBuiltinExpr(callee.getBuiltinDecl(), callee.getBuiltinID(),
4527 E, ReturnValue);
4528 }
4529
4530 if (callee.isPseudoDestructor()) {
4531 return EmitCXXPseudoDestructorExpr(callee.getPseudoDestructorExpr());
4532 }
4533
4534 return EmitCall(E->getCallee()->getType(), callee, E, ReturnValue);
4535}
4536
4537/// Emit a CallExpr without considering whether it might be a subclass.
4538RValue CodeGenFunction::EmitSimpleCallExpr(const CallExpr *E,
4539 ReturnValueSlot ReturnValue) {
4540 CGCallee Callee = EmitCallee(E->getCallee());
4541 return EmitCall(E->getCallee()->getType(), Callee, E, ReturnValue);
4542}
4543
4544static CGCallee EmitDirectCallee(CodeGenFunction &CGF, const FunctionDecl *FD) {
4545 if (auto builtinID = FD->getBuiltinID()) {
4546 return CGCallee::forBuiltin(builtinID, FD);
4547 }
4548
4549 llvm::Constant *calleePtr = EmitFunctionDeclPointer(CGF.CGM, FD);
4550 return CGCallee::forDirect(calleePtr, GlobalDecl(FD));
4551}
4552
4553CGCallee CodeGenFunction::EmitCallee(const Expr *E) {
4554 E = E->IgnoreParens();
4555
4556 // Look through function-to-pointer decay.
4557 if (auto ICE = dyn_cast<ImplicitCastExpr>(E)) {
4558 if (ICE->getCastKind() == CK_FunctionToPointerDecay ||
4559 ICE->getCastKind() == CK_BuiltinFnToFnPtr) {
4560 return EmitCallee(ICE->getSubExpr());
4561 }
4562
4563 // Resolve direct calls.
4564 } else if (auto DRE = dyn_cast<DeclRefExpr>(E)) {
4565 if (auto FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
4566 return EmitDirectCallee(*this, FD);
4567 }
4568 } else if (auto ME = dyn_cast<MemberExpr>(E)) {
4569 if (auto FD = dyn_cast<FunctionDecl>(ME->getMemberDecl())) {
4570 EmitIgnoredExpr(ME->getBase());
4571 return EmitDirectCallee(*this, FD);
4572 }
4573
4574 // Look through template substitutions.
4575 } else if (auto NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E)) {
4576 return EmitCallee(NTTP->getReplacement());
4577
4578 // Treat pseudo-destructor calls differently.
4579 } else if (auto PDE = dyn_cast<CXXPseudoDestructorExpr>(E)) {
4580 return CGCallee::forPseudoDestructor(PDE);
4581 }
4582
4583 // Otherwise, we have an indirect reference.
4584 llvm::Value *calleePtr;
4585 QualType functionType;
4586 if (auto ptrType = E->getType()->getAs<PointerType>()) {
4587 calleePtr = EmitScalarExpr(E);
4588 functionType = ptrType->getPointeeType();
4589 } else {
4590 functionType = E->getType();
4591 calleePtr = EmitLValue(E).getPointer();
4592 }
4593 assert(functionType->isFunctionType())((functionType->isFunctionType()) ? static_cast<void>
(0) : __assert_fail ("functionType->isFunctionType()", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4593, __PRETTY_FUNCTION__))
;
4594
4595 GlobalDecl GD;
4596 if (const auto *VD =
4597 dyn_cast_or_null<VarDecl>(E->getReferencedDeclOfCallee()))
4598 GD = GlobalDecl(VD);
4599
4600 CGCalleeInfo calleeInfo(functionType->getAs<FunctionProtoType>(), GD);
4601 CGCallee callee(calleeInfo, calleePtr);
4602 return callee;
4603}
4604
4605LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
4606 // Comma expressions just emit their LHS then their RHS as an l-value.
4607 if (E->getOpcode() == BO_Comma) {
4608 EmitIgnoredExpr(E->getLHS());
4609 EnsureInsertPoint();
4610 return EmitLValue(E->getRHS());
4611 }
4612
4613 if (E->getOpcode() == BO_PtrMemD ||
4614 E->getOpcode() == BO_PtrMemI)
4615 return EmitPointerToDataMemberBinaryExpr(E);
4616
4617 assert(E->getOpcode() == BO_Assign && "unexpected binary l-value")((E->getOpcode() == BO_Assign && "unexpected binary l-value"
) ? static_cast<void> (0) : __assert_fail ("E->getOpcode() == BO_Assign && \"unexpected binary l-value\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4617, __PRETTY_FUNCTION__))
;
4618
4619 // Note that in all of these cases, __block variables need the RHS
4620 // evaluated first just in case the variable gets moved by the RHS.
4621
4622 switch (getEvaluationKind(E->getType())) {
4623 case TEK_Scalar: {
4624 switch (E->getLHS()->getType().getObjCLifetime()) {
4625 case Qualifiers::OCL_Strong:
4626 return EmitARCStoreStrong(E, /*ignored*/ false).first;
4627
4628 case Qualifiers::OCL_Autoreleasing:
4629 return EmitARCStoreAutoreleasing(E).first;
4630
4631 // No reason to do any of these differently.
4632 case Qualifiers::OCL_None:
4633 case Qualifiers::OCL_ExplicitNone:
4634 case Qualifiers::OCL_Weak:
4635 break;
4636 }
4637
4638 RValue RV = EmitAnyExpr(E->getRHS());
4639 LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
4640 if (RV.isScalar())
4641 EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
4642 EmitStoreThroughLValue(RV, LV);
4643 return LV;
4644 }
4645
4646 case TEK_Complex:
4647 return EmitComplexAssignmentLValue(E);
4648
4649 case TEK_Aggregate:
4650 return EmitAggExprToLValue(E);
4651 }
4652 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4652)
;
4653}
4654
4655LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) {
4656 RValue RV = EmitCallExpr(E);
4657
4658 if (!RV.isScalar())
4659 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4660 AlignmentSource::Decl);
4661
4662 assert(E->getCallReturnType(getContext())->isReferenceType() &&((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4664, __PRETTY_FUNCTION__))
4663 "Can't have a scalar return unless the return type is a "((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4664, __PRETTY_FUNCTION__))
4664 "reference type!")((E->getCallReturnType(getContext())->isReferenceType()
&& "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getCallReturnType(getContext())->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4664, __PRETTY_FUNCTION__))
;
4665
4666 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4667}
4668
4669LValue CodeGenFunction::EmitVAArgExprLValue(const VAArgExpr *E) {
4670 // FIXME: This shouldn't require another copy.
4671 return EmitAggExprToLValue(E);
4672}
4673
4674LValue CodeGenFunction::EmitCXXConstructLValue(const CXXConstructExpr *E) {
4675 assert(E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor()((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4676, __PRETTY_FUNCTION__))
4676 && "binding l-value to type which needs a temporary")((E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor
() && "binding l-value to type which needs a temporary"
) ? static_cast<void> (0) : __assert_fail ("E->getType()->getAsCXXRecordDecl()->hasTrivialDestructor() && \"binding l-value to type which needs a temporary\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4676, __PRETTY_FUNCTION__))
;
4677 AggValueSlot Slot = CreateAggTemp(E->getType());
4678 EmitCXXConstructExpr(E, Slot);
4679 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4680}
4681
4682LValue
4683CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
4684 return MakeNaturalAlignAddrLValue(EmitCXXTypeidExpr(E), E->getType());
4685}
4686
4687Address CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
4688 return Builder.CreateElementBitCast(CGM.GetAddrOfUuidDescriptor(E),
4689 ConvertType(E->getType()));
4690}
4691
4692LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
4693 return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType(),
4694 AlignmentSource::Decl);
4695}
4696
4697LValue
4698CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
4699 AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
4700 Slot.setExternallyDestructed();
4701 EmitAggExpr(E->getSubExpr(), Slot);
4702 EmitCXXTemporary(E->getTemporary(), E->getType(), Slot.getAddress());
4703 return MakeAddrLValue(Slot.getAddress(), E->getType(), AlignmentSource::Decl);
4704}
4705
4706LValue CodeGenFunction::EmitObjCMessageExprLValue(const ObjCMessageExpr *E) {
4707 RValue RV = EmitObjCMessageExpr(E);
4708
4709 if (!RV.isScalar())
4710 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4711 AlignmentSource::Decl);
4712
4713 assert(E->getMethodDecl()->getReturnType()->isReferenceType() &&((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4715, __PRETTY_FUNCTION__))
4714 "Can't have a scalar return unless the return type is a "((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4715, __PRETTY_FUNCTION__))
4715 "reference type!")((E->getMethodDecl()->getReturnType()->isReferenceType
() && "Can't have a scalar return unless the return type is a "
"reference type!") ? static_cast<void> (0) : __assert_fail
("E->getMethodDecl()->getReturnType()->isReferenceType() && \"Can't have a scalar return unless the return type is a \" \"reference type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4715, __PRETTY_FUNCTION__))
;
4716
4717 return MakeNaturalAlignPointeeAddrLValue(RV.getScalarVal(), E->getType());
4718}
4719
4720LValue CodeGenFunction::EmitObjCSelectorLValue(const ObjCSelectorExpr *E) {
4721 Address V =
4722 CGM.getObjCRuntime().GetAddrOfSelector(*this, E->getSelector());
4723 return MakeAddrLValue(V, E->getType(), AlignmentSource::Decl);
4724}
4725
4726llvm::Value *CodeGenFunction::EmitIvarOffset(const ObjCInterfaceDecl *Interface,
4727 const ObjCIvarDecl *Ivar) {
4728 return CGM.getObjCRuntime().EmitIvarOffset(*this, Interface, Ivar);
4729}
4730
4731LValue CodeGenFunction::EmitLValueForIvar(QualType ObjectTy,
4732 llvm::Value *BaseValue,
4733 const ObjCIvarDecl *Ivar,
4734 unsigned CVRQualifiers) {
4735 return CGM.getObjCRuntime().EmitObjCValueForIvar(*this, ObjectTy, BaseValue,
4736 Ivar, CVRQualifiers);
4737}
4738
4739LValue CodeGenFunction::EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E) {
4740 // FIXME: A lot of the code below could be shared with EmitMemberExpr.
4741 llvm::Value *BaseValue = nullptr;
4742 const Expr *BaseExpr = E->getBase();
4743 Qualifiers BaseQuals;
4744 QualType ObjectTy;
4745 if (E->isArrow()) {
4746 BaseValue = EmitScalarExpr(BaseExpr);
4747 ObjectTy = BaseExpr->getType()->getPointeeType();
4748 BaseQuals = ObjectTy.getQualifiers();
4749 } else {
4750 LValue BaseLV = EmitLValue(BaseExpr);
4751 BaseValue = BaseLV.getPointer();
4752 ObjectTy = BaseExpr->getType();
4753 BaseQuals = ObjectTy.getQualifiers();
4754 }
4755
4756 LValue LV =
4757 EmitLValueForIvar(ObjectTy, BaseValue, E->getDecl(),
4758 BaseQuals.getCVRQualifiers());
4759 setObjCGCLValueClass(getContext(), E, LV);
4760 return LV;
4761}
4762
4763LValue CodeGenFunction::EmitStmtExprLValue(const StmtExpr *E) {
4764 // Can only get l-value for message expression returning aggregate type
4765 RValue RV = EmitAnyExprToTemp(E);
4766 return MakeAddrLValue(RV.getAggregateAddress(), E->getType(),
4767 AlignmentSource::Decl);
4768}
4769
4770RValue CodeGenFunction::EmitCall(QualType CalleeType, const CGCallee &OrigCallee,
4771 const CallExpr *E, ReturnValueSlot ReturnValue,
4772 llvm::Value *Chain) {
4773 // Get the actual function type. The callee type will always be a pointer to
4774 // function type or a block pointer type.
4775 assert(CalleeType->isFunctionPointerType() &&((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4776, __PRETTY_FUNCTION__))
4776 "Call must have function pointer type!")((CalleeType->isFunctionPointerType() && "Call must have function pointer type!"
) ? static_cast<void> (0) : __assert_fail ("CalleeType->isFunctionPointerType() && \"Call must have function pointer type!\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4776, __PRETTY_FUNCTION__))
;
4777
4778 const Decl *TargetDecl =
4779 OrigCallee.getAbstractInfo().getCalleeDecl().getDecl();
4780
4781 CalleeType = getContext().getCanonicalType(CalleeType);
4782
4783 auto PointeeType = cast<PointerType>(CalleeType)->getPointeeType();
4784
4785 CGCallee Callee = OrigCallee;
4786
4787 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function) &&
4788 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4789 if (llvm::Constant *PrefixSig =
4790 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
4791 SanitizerScope SanScope(this);
4792 // Remove any (C++17) exception specifications, to allow calling e.g. a
4793 // noexcept function through a non-noexcept pointer.
4794 auto ProtoTy =
4795 getContext().getFunctionTypeWithExceptionSpec(PointeeType, EST_None);
4796 llvm::Constant *FTRTTIConst =
4797 CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true);
4798 llvm::Type *PrefixStructTyElems[] = {PrefixSig->getType(), Int32Ty};
4799 llvm::StructType *PrefixStructTy = llvm::StructType::get(
4800 CGM.getLLVMContext(), PrefixStructTyElems, /*isPacked=*/true);
4801
4802 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4803
4804 llvm::Value *CalleePrefixStruct = Builder.CreateBitCast(
4805 CalleePtr, llvm::PointerType::getUnqual(PrefixStructTy));
4806 llvm::Value *CalleeSigPtr =
4807 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 0);
4808 llvm::Value *CalleeSig =
4809 Builder.CreateAlignedLoad(CalleeSigPtr, getIntAlign());
4810 llvm::Value *CalleeSigMatch = Builder.CreateICmpEQ(CalleeSig, PrefixSig);
4811
4812 llvm::BasicBlock *Cont = createBasicBlock("cont");
4813 llvm::BasicBlock *TypeCheck = createBasicBlock("typecheck");
4814 Builder.CreateCondBr(CalleeSigMatch, TypeCheck, Cont);
4815
4816 EmitBlock(TypeCheck);
4817 llvm::Value *CalleeRTTIPtr =
4818 Builder.CreateConstGEP2_32(PrefixStructTy, CalleePrefixStruct, 0, 1);
4819 llvm::Value *CalleeRTTIEncoded =
4820 Builder.CreateAlignedLoad(CalleeRTTIPtr, getPointerAlign());
4821 llvm::Value *CalleeRTTI =
4822 DecodeAddrUsedInPrologue(CalleePtr, CalleeRTTIEncoded);
4823 llvm::Value *CalleeRTTIMatch =
4824 Builder.CreateICmpEQ(CalleeRTTI, FTRTTIConst);
4825 llvm::Constant *StaticData[] = {EmitCheckSourceLocation(E->getBeginLoc()),
4826 EmitCheckTypeDescriptor(CalleeType)};
4827 EmitCheck(std::make_pair(CalleeRTTIMatch, SanitizerKind::Function),
4828 SanitizerHandler::FunctionTypeMismatch, StaticData,
4829 {CalleePtr, CalleeRTTI, FTRTTIConst});
4830
4831 Builder.CreateBr(Cont);
4832 EmitBlock(Cont);
4833 }
4834 }
4835
4836 const auto *FnType = cast<FunctionType>(PointeeType);
4837
4838 // If we are checking indirect calls and this call is indirect, check that the
4839 // function pointer is a member of the bit set for the function type.
4840 if (SanOpts.has(SanitizerKind::CFIICall) &&
4841 (!TargetDecl || !isa<FunctionDecl>(TargetDecl))) {
4842 SanitizerScope SanScope(this);
4843 EmitSanitizerStatReport(llvm::SanStat_CFI_ICall);
4844
4845 llvm::Metadata *MD;
4846 if (CGM.getCodeGenOpts().SanitizeCfiICallGeneralizePointers)
4847 MD = CGM.CreateMetadataIdentifierGeneralized(QualType(FnType, 0));
4848 else
4849 MD = CGM.CreateMetadataIdentifierForType(QualType(FnType, 0));
4850
4851 llvm::Value *TypeId = llvm::MetadataAsValue::get(getLLVMContext(), MD);
4852
4853 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4854 llvm::Value *CastedCallee = Builder.CreateBitCast(CalleePtr, Int8PtrTy);
4855 llvm::Value *TypeTest = Builder.CreateCall(
4856 CGM.getIntrinsic(llvm::Intrinsic::type_test), {CastedCallee, TypeId});
4857
4858 auto CrossDsoTypeId = CGM.CreateCrossDsoCfiTypeId(MD);
4859 llvm::Constant *StaticData[] = {
4860 llvm::ConstantInt::get(Int8Ty, CFITCK_ICall),
4861 EmitCheckSourceLocation(E->getBeginLoc()),
4862 EmitCheckTypeDescriptor(QualType(FnType, 0)),
4863 };
4864 if (CGM.getCodeGenOpts().SanitizeCfiCrossDso && CrossDsoTypeId) {
4865 EmitCfiSlowPathCheck(SanitizerKind::CFIICall, TypeTest, CrossDsoTypeId,
4866 CastedCallee, StaticData);
4867 } else {
4868 EmitCheck(std::make_pair(TypeTest, SanitizerKind::CFIICall),
4869 SanitizerHandler::CFICheckFail, StaticData,
4870 {CastedCallee, llvm::UndefValue::get(IntPtrTy)});
4871 }
4872 }
4873
4874 CallArgList Args;
4875 if (Chain)
4876 Args.add(RValue::get(Builder.CreateBitCast(Chain, CGM.VoidPtrTy)),
4877 CGM.getContext().VoidPtrTy);
4878
4879 // C++17 requires that we evaluate arguments to a call using assignment syntax
4880 // right-to-left, and that we evaluate arguments to certain other operators
4881 // left-to-right. Note that we allow this to override the order dictated by
4882 // the calling convention on the MS ABI, which means that parameter
4883 // destruction order is not necessarily reverse construction order.
4884 // FIXME: Revisit this based on C++ committee response to unimplementability.
4885 EvaluationOrder Order = EvaluationOrder::Default;
4886 if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
4887 if (OCE->isAssignmentOp())
4888 Order = EvaluationOrder::ForceRightToLeft;
4889 else {
4890 switch (OCE->getOperator()) {
4891 case OO_LessLess:
4892 case OO_GreaterGreater:
4893 case OO_AmpAmp:
4894 case OO_PipePipe:
4895 case OO_Comma:
4896 case OO_ArrowStar:
4897 Order = EvaluationOrder::ForceLeftToRight;
4898 break;
4899 default:
4900 break;
4901 }
4902 }
4903 }
4904
4905 EmitCallArgs(Args, dyn_cast<FunctionProtoType>(FnType), E->arguments(),
4906 E->getDirectCallee(), /*ParamsToSkip*/ 0, Order);
4907
4908 const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeFreeFunctionCall(
4909 Args, FnType, /*ChainCall=*/Chain);
4910
4911 // C99 6.5.2.2p6:
4912 // If the expression that denotes the called function has a type
4913 // that does not include a prototype, [the default argument
4914 // promotions are performed]. If the number of arguments does not
4915 // equal the number of parameters, the behavior is undefined. If
4916 // the function is defined with a type that includes a prototype,
4917 // and either the prototype ends with an ellipsis (, ...) or the
4918 // types of the arguments after promotion are not compatible with
4919 // the types of the parameters, the behavior is undefined. If the
4920 // function is defined with a type that does not include a
4921 // prototype, and the types of the arguments after promotion are
4922 // not compatible with those of the parameters after promotion,
4923 // the behavior is undefined [except in some trivial cases].
4924 // That is, in the general case, we should assume that a call
4925 // through an unprototyped function type works like a *non-variadic*
4926 // call. The way we make this work is to cast to the exact type
4927 // of the promoted arguments.
4928 //
4929 // Chain calls use this same code path to add the invisible chain parameter
4930 // to the function type.
4931 if (isa<FunctionNoProtoType>(FnType) || Chain) {
4932 llvm::Type *CalleeTy = getTypes().GetFunctionType(FnInfo);
4933 CalleeTy = CalleeTy->getPointerTo();
4934
4935 llvm::Value *CalleePtr = Callee.getFunctionPointer();
4936 CalleePtr = Builder.CreateBitCast(CalleePtr, CalleeTy, "callee.knr.cast");
4937 Callee.setFunctionPointer(CalleePtr);
4938 }
4939
4940 llvm::CallBase *CallOrInvoke = nullptr;
4941 RValue Call = EmitCall(FnInfo, Callee, ReturnValue, Args, &CallOrInvoke,
4942 E->getExprLoc());
4943
4944 // Generate function declaration DISuprogram in order to be used
4945 // in debug info about call sites.
4946 if (CGDebugInfo *DI = getDebugInfo()) {
4947 if (auto *CalleeDecl = dyn_cast_or_null<FunctionDecl>(TargetDecl))
4948 DI->EmitFuncDeclForCallSite(CallOrInvoke, QualType(FnType, 0),
4949 CalleeDecl);
4950 }
4951
4952 return Call;
4953}
4954
4955LValue CodeGenFunction::
4956EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E) {
4957 Address BaseAddr = Address::invalid();
4958 if (E->getOpcode() == BO_PtrMemI) {
4959 BaseAddr = EmitPointerWithAlignment(E->getLHS());
4960 } else {
4961 BaseAddr = EmitLValue(E->getLHS()).getAddress();
4962 }
4963
4964 llvm::Value *OffsetV = EmitScalarExpr(E->getRHS());
4965
4966 const MemberPointerType *MPT
4967 = E->getRHS()->getType()->getAs<MemberPointerType>();
4968
4969 LValueBaseInfo BaseInfo;
4970 TBAAAccessInfo TBAAInfo;
4971 Address MemberAddr =
4972 EmitCXXMemberDataPointerAddress(E, BaseAddr, OffsetV, MPT, &BaseInfo,
4973 &TBAAInfo);
4974
4975 return MakeAddrLValue(MemberAddr, MPT->getPointeeType(), BaseInfo, TBAAInfo);
4976}
4977
4978/// Given the address of a temporary variable, produce an r-value of
4979/// its type.
4980RValue CodeGenFunction::convertTempToRValue(Address addr,
4981 QualType type,
4982 SourceLocation loc) {
4983 LValue lvalue = MakeAddrLValue(addr, type, AlignmentSource::Decl);
4984 switch (getEvaluationKind(type)) {
4985 case TEK_Complex:
4986 return RValue::getComplex(EmitLoadOfComplex(lvalue, loc));
4987 case TEK_Aggregate:
4988 return lvalue.asAggregateRValue();
4989 case TEK_Scalar:
4990 return RValue::get(EmitLoadOfScalar(lvalue, loc));
4991 }
4992 llvm_unreachable("bad evaluation kind")::llvm::llvm_unreachable_internal("bad evaluation kind", "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4992)
;
4993}
4994
4995void CodeGenFunction::SetFPAccuracy(llvm::Value *Val, float Accuracy) {
4996 assert(Val->getType()->isFPOrFPVectorTy())((Val->getType()->isFPOrFPVectorTy()) ? static_cast<
void> (0) : __assert_fail ("Val->getType()->isFPOrFPVectorTy()"
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 4996, __PRETTY_FUNCTION__))
;
4997 if (Accuracy == 0.0 || !isa<llvm::Instruction>(Val))
4998 return;
4999
5000 llvm::MDBuilder MDHelper(getLLVMContext());
5001 llvm::MDNode *Node = MDHelper.createFPMath(Accuracy);
5002
5003 cast<llvm::Instruction>(Val)->setMetadata(llvm::LLVMContext::MD_fpmath, Node);
5004}
5005
5006namespace {
5007 struct LValueOrRValue {
5008 LValue LV;
5009 RValue RV;
5010 };
5011}
5012
5013static LValueOrRValue emitPseudoObjectExpr(CodeGenFunction &CGF,
5014 const PseudoObjectExpr *E,
5015 bool forLValue,
5016 AggValueSlot slot) {
5017 SmallVector<CodeGenFunction::OpaqueValueMappingData, 4> opaques;
5018
5019 // Find the result expression, if any.
5020 const Expr *resultExpr = E->getResultExpr();
5021 LValueOrRValue result;
5022
5023 for (PseudoObjectExpr::const_semantics_iterator
3
Loop condition is true. Entering loop body
5024 i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
2
Assuming 'i' is not equal to 'e'
5025 const Expr *semantic = *i;
5026
5027 // If this semantic expression is an opaque value, bind it
5028 // to the result of its source expression.
5029 if (const auto *ov
4.1
'ov' is null
= dyn_cast<OpaqueValueExpr>(semantic)) {
4
Assuming 'semantic' is not a 'OpaqueValueExpr'
5
Taking false branch
5030 // Skip unique OVEs.
5031 if (ov->isUnique()) {
5032 assert(ov != resultExpr &&((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 5033, __PRETTY_FUNCTION__))
5033 "A unique OVE cannot be used as the result expression")((ov != resultExpr && "A unique OVE cannot be used as the result expression"
) ? static_cast<void> (0) : __assert_fail ("ov != resultExpr && \"A unique OVE cannot be used as the result expression\""
, "/build/llvm-toolchain-snapshot-10~svn374814/tools/clang/lib/CodeGen/CGExpr.cpp"
, 5033, __PRETTY_FUNCTION__))
;
5034 continue;
5035 }
5036
5037 // If this is the result expression, we may need to evaluate
5038 // directly into the slot.
5039 typedef CodeGenFunction::OpaqueValueMappingData OVMA;
5040 OVMA opaqueData;
5041 if (ov == resultExpr && ov->isRValue() && !forLValue &&
5042 CodeGenFunction::hasAggregateEvaluationKind(ov->getType())) {
5043 CGF.EmitAggExpr(ov->getSourceExpr(), slot);
5044 LValue LV = CGF.MakeAddrLValue(slot.getAddress(), ov->getType(),
5045 AlignmentSource::Decl);
5046 opaqueData = OVMA::bind(CGF, ov, LV);
5047 result.RV = slot.asRValue();
5048
5049 // Otherwise, emit as normal.
5050 } else {
5051 opaqueData = OVMA::bind(CGF, ov, ov->getSourceExpr());
5052
5053 // If this is the result, also evaluate the result now.
5054 if (ov == resultExpr) {
5055 if (forLValue)
5056 result.LV = CGF.EmitLValue(ov);
5057 else
5058 result.RV = CGF.EmitAnyExpr(ov, slot);
5059 }
5060 }
5061
5062 opaques.push_back(opaqueData);
5063
5064 // Otherwise, if the expression is the result, evaluate it
5065 // and remember the result.
5066 } else if (semantic == resultExpr) {
6
Assuming 'semantic' is not equal to 'resultExpr'
7
Taking false branch
5067 if (forLValue)
5068 result.LV = CGF.EmitLValue(semantic);
5069 else
5070 result.RV = CGF.EmitAnyExpr(semantic, slot);
5071
5072 // Otherwise, evaluate the expression in an ignored context.
5073 } else {
5074 CGF.EmitIgnoredExpr(semantic);
8
Calling 'CodeGenFunction::EmitIgnoredExpr'
5075 }
5076 }
5077
5078 // Unbind all the opaques now.
5079 for (unsigned i = 0, e = opaques.size(); i != e; ++i)
5080 opaques[i].unbind(CGF);
5081
5082 return result;
5083}
5084
5085RValue CodeGenFunction::EmitPseudoObjectRValue(const PseudoObjectExpr *E,
5086 AggValueSlot slot) {
5087 return emitPseudoObjectExpr(*this, E, false, slot).RV;
1
Calling 'emitPseudoObjectExpr'
5088}
5089
5090LValue CodeGenFunction::EmitPseudoObjectLValue(const PseudoObjectExpr *E) {
5091 return emitPseudoObjectExpr(*this, E, true, AggValueSlot::ignored()).LV;
5092}