1//===--- Expr.cpp - Expression AST Node Implementation --------------------===//
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 file implements the Expr class and subclasses.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/Expr.h"
14#include "clang/AST/APValue.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTLambda.h"
17#include "clang/AST/Attr.h"
18#include "clang/AST/ComputeDependence.h"
19#include "clang/AST/DeclCXX.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/DependenceFlags.h"
23#include "clang/AST/EvaluatedExprVisitor.h"
24#include "clang/AST/ExprCXX.h"
25#include "clang/AST/IgnoreExpr.h"
26#include "clang/AST/Mangle.h"
27#include "clang/AST/RecordLayout.h"
28#include "clang/AST/StmtVisitor.h"
29#include "clang/AST/TypeBase.h"
30#include "clang/Basic/Builtins.h"
31#include "clang/Basic/CharInfo.h"
32#include "clang/Basic/SourceManager.h"
33#include "clang/Basic/TargetInfo.h"
34#include "clang/Lex/Lexer.h"
35#include "clang/Lex/LiteralSupport.h"
36#include "clang/Lex/Preprocessor.h"
37#include "llvm/Support/ErrorHandling.h"
38#include "llvm/Support/Format.h"
39#include "llvm/Support/raw_ostream.h"
40#include <algorithm>
41#include <cstring>
42#include <optional>
43using namespace clang;
44
45const Expr *Expr::getBestDynamicClassTypeExpr() const {
46 const Expr *E = this;
47 while (true) {
48 E = E->IgnoreParenBaseCasts();
49
50 // Follow the RHS of a comma operator.
51 if (auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
52 if (BO->getOpcode() == BO_Comma) {
53 E = BO->getRHS();
54 continue;
55 }
56 }
57
58 // Step into initializer for materialized temporaries.
59 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Val: E)) {
60 E = MTE->getSubExpr();
61 continue;
62 }
63
64 break;
65 }
66
67 return E;
68}
69
70const CXXRecordDecl *Expr::getBestDynamicClassType() const {
71 const Expr *E = getBestDynamicClassTypeExpr();
72 QualType DerivedType = E->getType();
73 if (const PointerType *PTy = DerivedType->getAs<PointerType>())
74 DerivedType = PTy->getPointeeType();
75
76 while (const ArrayType *ATy = DerivedType->getAsArrayTypeUnsafe())
77 DerivedType = ATy->getElementType();
78
79 if (DerivedType->isDependentType())
80 return nullptr;
81
82 return DerivedType->castAsCXXRecordDecl();
83}
84
85const Expr *Expr::skipRValueSubobjectAdjustments(
86 SmallVectorImpl<const Expr *> &CommaLHSs,
87 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
88 const Expr *E = this;
89 while (true) {
90 E = E->IgnoreParens();
91
92 if (const auto *CE = dyn_cast<CastExpr>(Val: E)) {
93 if ((CE->getCastKind() == CK_DerivedToBase ||
94 CE->getCastKind() == CK_UncheckedDerivedToBase) &&
95 E->getType()->isRecordType()) {
96 E = CE->getSubExpr();
97 const auto *Derived = E->getType()->castAsCXXRecordDecl();
98 Adjustments.push_back(Elt: SubobjectAdjustment(CE, Derived));
99 continue;
100 }
101
102 if (CE->getCastKind() == CK_NoOp) {
103 E = CE->getSubExpr();
104 continue;
105 }
106 } else if (const auto *ME = dyn_cast<MemberExpr>(Val: E)) {
107 if (!ME->isArrow()) {
108 assert(ME->getBase()->getType()->getAsRecordDecl());
109 if (const auto *Field = dyn_cast<FieldDecl>(Val: ME->getMemberDecl())) {
110 if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
111 E = ME->getBase();
112 Adjustments.push_back(Elt: SubobjectAdjustment(Field));
113 continue;
114 }
115 }
116 }
117 } else if (const auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
118 if (BO->getOpcode() == BO_PtrMemD) {
119 assert(BO->getRHS()->isPRValue());
120 E = BO->getLHS();
121 const auto *MPT = BO->getRHS()->getType()->getAs<MemberPointerType>();
122 Adjustments.push_back(Elt: SubobjectAdjustment(MPT, BO->getRHS()));
123 continue;
124 }
125 if (BO->getOpcode() == BO_Comma) {
126 CommaLHSs.push_back(Elt: BO->getLHS());
127 E = BO->getRHS();
128 continue;
129 }
130 }
131
132 // Nothing changed.
133 break;
134 }
135 return E;
136}
137
138bool Expr::isKnownToHaveBooleanValue(bool Semantic) const {
139 const Expr *E = IgnoreParens();
140
141 // If this value has _Bool type, it is obvious 0/1.
142 if (E->getType()->isBooleanType()) return true;
143 // If this is a non-scalar-integer type, we don't care enough to try.
144 if (!E->getType()->isIntegralOrEnumerationType()) return false;
145
146 if (!Semantic)
147 if (const auto *BIT = E->getType()->getAs<BitIntType>();
148 BIT && BIT->isUnsigned() && BIT->getNumBits() == 1)
149 return true;
150
151 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(Val: E)) {
152 switch (UO->getOpcode()) {
153 case UO_Plus:
154 return UO->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
155 case UO_LNot:
156 return true;
157 default:
158 return false;
159 }
160 }
161
162 // Only look through implicit casts. If the user writes
163 // '(int) (a && b)' treat it as an arbitrary int.
164 // FIXME: Should we look through any cast expression in !Semantic mode?
165 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(Val: E))
166 return CE->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
167
168 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: E)) {
169 switch (BO->getOpcode()) {
170 default: return false;
171 case BO_LT: // Relational operators.
172 case BO_GT:
173 case BO_LE:
174 case BO_GE:
175 case BO_EQ: // Equality operators.
176 case BO_NE:
177 case BO_LAnd: // AND operator.
178 case BO_LOr: // Logical OR operator.
179 return true;
180
181 case BO_And: // Bitwise AND operator.
182 case BO_Xor: // Bitwise XOR operator.
183 case BO_Or: // Bitwise OR operator.
184 // Handle things like (x==2)|(y==12).
185 return BO->getLHS()->isKnownToHaveBooleanValue(Semantic) &&
186 BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
187
188 case BO_Comma:
189 case BO_Assign:
190 return BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
191 }
192 }
193
194 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(Val: E))
195 return CO->getTrueExpr()->isKnownToHaveBooleanValue(Semantic) &&
196 CO->getFalseExpr()->isKnownToHaveBooleanValue(Semantic);
197
198 if (isa<ObjCBoolLiteralExpr>(Val: E))
199 return true;
200
201 if (const auto *OVE = dyn_cast<OpaqueValueExpr>(Val: E))
202 return OVE->getSourceExpr()->isKnownToHaveBooleanValue(Semantic);
203
204 if (const FieldDecl *FD = E->getSourceBitField())
205 if (!Semantic && FD->getType()->isUnsignedIntegerType() &&
206 !FD->getBitWidth()->isValueDependent() && FD->getBitWidthValue() == 1)
207 return true;
208
209 return false;
210}
211
212bool Expr::isFlexibleArrayMemberLike(
213 const ASTContext &Ctx,
214 LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
215 bool IgnoreTemplateOrMacroSubstitution) const {
216 const Expr *E = IgnoreParens();
217 const Decl *D = nullptr;
218
219 if (const auto *ME = dyn_cast<MemberExpr>(Val: E))
220 D = ME->getMemberDecl();
221 else if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
222 D = DRE->getDecl();
223 else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(Val: E))
224 D = IRE->getDecl();
225
226 return Decl::isFlexibleArrayMemberLike(Context: Ctx, D, Ty: E->getType(),
227 StrictFlexArraysLevel,
228 IgnoreTemplateOrMacroSubstitution);
229}
230
231const ValueDecl *
232Expr::getAsBuiltinConstantDeclRef(const ASTContext &Context) const {
233 Expr::EvalResult Eval;
234
235 if (EvaluateAsConstantExpr(Result&: Eval, Ctx: Context)) {
236 APValue &Value = Eval.Val;
237
238 if (Value.isMemberPointer())
239 return Value.getMemberPointerDecl();
240
241 if (Value.isLValue() && Value.getLValueOffset().isZero())
242 return Value.getLValueBase().dyn_cast<const ValueDecl *>();
243 }
244
245 return nullptr;
246}
247
248// Amusing macro metaprogramming hack: check whether a class provides
249// a more specific implementation of getExprLoc().
250//
251// See also Stmt.cpp:{getBeginLoc(),getEndLoc()}.
252namespace {
253 /// This implementation is used when a class provides a custom
254 /// implementation of getExprLoc.
255 template <class E, class T>
256 SourceLocation getExprLocImpl(const Expr *expr,
257 SourceLocation (T::*v)() const) {
258 return static_cast<const E*>(expr)->getExprLoc();
259 }
260
261 /// This implementation is used when a class doesn't provide
262 /// a custom implementation of getExprLoc. Overload resolution
263 /// should pick it over the implementation above because it's
264 /// more specialized according to function template partial ordering.
265 template <class E>
266 SourceLocation getExprLocImpl(const Expr *expr,
267 SourceLocation (Expr::*v)() const) {
268 return static_cast<const E *>(expr)->getBeginLoc();
269 }
270}
271
272QualType Expr::getEnumCoercedType(const ASTContext &Ctx) const {
273 if (isa<EnumType>(Val: getType()))
274 return getType();
275 if (const auto *ECD = getEnumConstantDecl()) {
276 const auto *ED = cast<EnumDecl>(Val: ECD->getDeclContext());
277 if (ED->isCompleteDefinition())
278 return Ctx.getCanonicalTagType(TD: ED);
279 }
280 return getType();
281}
282
283SourceLocation Expr::getExprLoc() const {
284 switch (getStmtClass()) {
285 case Stmt::NoStmtClass: llvm_unreachable("statement without class");
286#define ABSTRACT_STMT(type)
287#define STMT(type, base) \
288 case Stmt::type##Class: break;
289#define EXPR(type, base) \
290 case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
291#include "clang/AST/StmtNodes.inc"
292 }
293 llvm_unreachable("unknown expression kind");
294}
295
296//===----------------------------------------------------------------------===//
297// Primary Expressions.
298//===----------------------------------------------------------------------===//
299
300static void AssertResultStorageKind(ConstantResultStorageKind Kind) {
301 assert((Kind == ConstantResultStorageKind::APValue ||
302 Kind == ConstantResultStorageKind::Int64 ||
303 Kind == ConstantResultStorageKind::None) &&
304 "Invalid StorageKind Value");
305 (void)Kind;
306}
307
308ConstantResultStorageKind ConstantExpr::getStorageKind(const APValue &Value) {
309 switch (Value.getKind()) {
310 case APValue::None:
311 case APValue::Indeterminate:
312 return ConstantResultStorageKind::None;
313 case APValue::Int:
314 if (!Value.getInt().needsCleanup())
315 return ConstantResultStorageKind::Int64;
316 [[fallthrough]];
317 default:
318 return ConstantResultStorageKind::APValue;
319 }
320}
321
322ConstantResultStorageKind
323ConstantExpr::getStorageKind(const Type *T, const ASTContext &Context) {
324 if (T->isIntegralOrEnumerationType() && Context.getTypeInfo(T).Width <= 64)
325 return ConstantResultStorageKind::Int64;
326 return ConstantResultStorageKind::APValue;
327}
328
329ConstantExpr::ConstantExpr(Expr *SubExpr, ConstantResultStorageKind StorageKind,
330 bool IsImmediateInvocation)
331 : FullExpr(ConstantExprClass, SubExpr) {
332 ConstantExprBits.ResultKind = llvm::to_underlying(E: StorageKind);
333 ConstantExprBits.APValueKind = APValue::None;
334 ConstantExprBits.IsUnsigned = false;
335 ConstantExprBits.BitWidth = 0;
336 ConstantExprBits.HasCleanup = false;
337 ConstantExprBits.IsImmediateInvocation = IsImmediateInvocation;
338
339 if (StorageKind == ConstantResultStorageKind::APValue)
340 ::new (getTrailingObjects<APValue>()) APValue();
341}
342
343ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
344 ConstantResultStorageKind StorageKind,
345 bool IsImmediateInvocation) {
346 assert(!isa<ConstantExpr>(E));
347 AssertResultStorageKind(Kind: StorageKind);
348
349 unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
350 Counts: StorageKind == ConstantResultStorageKind::APValue,
351 Counts: StorageKind == ConstantResultStorageKind::Int64);
352 void *Mem = Context.Allocate(Size, Align: alignof(ConstantExpr));
353 return new (Mem) ConstantExpr(E, StorageKind, IsImmediateInvocation);
354}
355
356ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
357 const APValue &Result) {
358 ConstantResultStorageKind StorageKind = getStorageKind(Value: Result);
359 ConstantExpr *Self = Create(Context, E, StorageKind);
360 Self->SetResult(Value: Result, Context);
361 return Self;
362}
363
364ConstantExpr::ConstantExpr(EmptyShell Empty,
365 ConstantResultStorageKind StorageKind)
366 : FullExpr(ConstantExprClass, Empty) {
367 ConstantExprBits.ResultKind = llvm::to_underlying(E: StorageKind);
368
369 if (StorageKind == ConstantResultStorageKind::APValue)
370 ::new (getTrailingObjects<APValue>()) APValue();
371}
372
373ConstantExpr *ConstantExpr::CreateEmpty(const ASTContext &Context,
374 ConstantResultStorageKind StorageKind) {
375 AssertResultStorageKind(Kind: StorageKind);
376
377 unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
378 Counts: StorageKind == ConstantResultStorageKind::APValue,
379 Counts: StorageKind == ConstantResultStorageKind::Int64);
380 void *Mem = Context.Allocate(Size, Align: alignof(ConstantExpr));
381 return new (Mem) ConstantExpr(EmptyShell(), StorageKind);
382}
383
384void ConstantExpr::MoveIntoResult(APValue &Value, const ASTContext &Context) {
385 assert((unsigned)getStorageKind(Value) <= ConstantExprBits.ResultKind &&
386 "Invalid storage for this value kind");
387 ConstantExprBits.APValueKind = Value.getKind();
388 switch (getResultStorageKind()) {
389 case ConstantResultStorageKind::None:
390 return;
391 case ConstantResultStorageKind::Int64:
392 Int64Result() = *Value.getInt().getRawData();
393 ConstantExprBits.BitWidth = Value.getInt().getBitWidth();
394 ConstantExprBits.IsUnsigned = Value.getInt().isUnsigned();
395 return;
396 case ConstantResultStorageKind::APValue:
397 if (!ConstantExprBits.HasCleanup && Value.needsCleanup()) {
398 ConstantExprBits.HasCleanup = true;
399 Context.addDestruction(Ptr: &APValueResult());
400 }
401 APValueResult() = std::move(Value);
402 return;
403 }
404 llvm_unreachable("Invalid ResultKind Bits");
405}
406
407llvm::APSInt ConstantExpr::getResultAsAPSInt() const {
408 switch (getResultStorageKind()) {
409 case ConstantResultStorageKind::APValue:
410 return APValueResult().getInt();
411 case ConstantResultStorageKind::Int64:
412 return llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
413 ConstantExprBits.IsUnsigned);
414 default:
415 llvm_unreachable("invalid Accessor");
416 }
417}
418
419APValue ConstantExpr::getAPValueResult() const {
420
421 switch (getResultStorageKind()) {
422 case ConstantResultStorageKind::APValue:
423 return APValueResult();
424 case ConstantResultStorageKind::Int64:
425 return APValue(
426 llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
427 ConstantExprBits.IsUnsigned));
428 case ConstantResultStorageKind::None:
429 if (ConstantExprBits.APValueKind == APValue::Indeterminate)
430 return APValue::IndeterminateValue();
431 return APValue();
432 }
433 llvm_unreachable("invalid ResultKind");
434}
435
436DeclRefExpr::DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
437 bool RefersToEnclosingVariableOrCapture, QualType T,
438 ExprValueKind VK, SourceLocation L,
439 const DeclarationNameLoc &LocInfo,
440 NonOdrUseReason NOUR)
441 : Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D), DNLoc(LocInfo) {
442 DeclRefExprBits.HasQualifier = false;
443 DeclRefExprBits.HasTemplateKWAndArgsInfo = false;
444 DeclRefExprBits.HasFoundDecl = false;
445 DeclRefExprBits.HadMultipleCandidates = false;
446 DeclRefExprBits.RefersToEnclosingVariableOrCapture =
447 RefersToEnclosingVariableOrCapture;
448 DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
449 DeclRefExprBits.NonOdrUseReason = NOUR;
450 DeclRefExprBits.IsImmediateEscalating = false;
451 DeclRefExprBits.Loc = L;
452 setDependence(computeDependence(E: this, Ctx));
453}
454
455DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
456 NestedNameSpecifierLoc QualifierLoc,
457 SourceLocation TemplateKWLoc, ValueDecl *D,
458 bool RefersToEnclosingVariableOrCapture,
459 const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
460 const TemplateArgumentListInfo *TemplateArgs,
461 QualType T, ExprValueKind VK, NonOdrUseReason NOUR)
462 : Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D),
463 DNLoc(NameInfo.getInfo()) {
464 DeclRefExprBits.Loc = NameInfo.getLoc();
465 DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
466 if (QualifierLoc)
467 new (getTrailingObjects<NestedNameSpecifierLoc>())
468 NestedNameSpecifierLoc(QualifierLoc);
469 DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
470 if (FoundD)
471 *getTrailingObjects<NamedDecl *>() = FoundD;
472 DeclRefExprBits.HasTemplateKWAndArgsInfo
473 = (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
474 DeclRefExprBits.RefersToEnclosingVariableOrCapture =
475 RefersToEnclosingVariableOrCapture;
476 DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
477 DeclRefExprBits.NonOdrUseReason = NOUR;
478 if (TemplateArgs) {
479 auto Deps = TemplateArgumentDependence::None;
480 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
481 TemplateKWLoc, List: *TemplateArgs, OutArgArray: getTrailingObjects<TemplateArgumentLoc>(),
482 Deps);
483 assert(!(Deps & TemplateArgumentDependence::Dependent) &&
484 "built a DeclRefExpr with dependent template args");
485 } else if (TemplateKWLoc.isValid()) {
486 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
487 TemplateKWLoc);
488 }
489 DeclRefExprBits.IsImmediateEscalating = false;
490 DeclRefExprBits.HadMultipleCandidates = 0;
491 setDependence(computeDependence(E: this, Ctx));
492}
493
494DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
495 NestedNameSpecifierLoc QualifierLoc,
496 SourceLocation TemplateKWLoc, ValueDecl *D,
497 bool RefersToEnclosingVariableOrCapture,
498 SourceLocation NameLoc, QualType T,
499 ExprValueKind VK, NamedDecl *FoundD,
500 const TemplateArgumentListInfo *TemplateArgs,
501 NonOdrUseReason NOUR) {
502 return Create(Context, QualifierLoc, TemplateKWLoc, D,
503 RefersToEnclosingVariableOrCapture,
504 NameInfo: DeclarationNameInfo(D->getDeclName(), NameLoc),
505 T, VK, FoundD, TemplateArgs, NOUR);
506}
507
508DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
509 NestedNameSpecifierLoc QualifierLoc,
510 SourceLocation TemplateKWLoc, ValueDecl *D,
511 bool RefersToEnclosingVariableOrCapture,
512 const DeclarationNameInfo &NameInfo,
513 QualType T, ExprValueKind VK,
514 NamedDecl *FoundD,
515 const TemplateArgumentListInfo *TemplateArgs,
516 NonOdrUseReason NOUR) {
517 // Filter out cases where the found Decl is the same as the value refenenced.
518 if (D == FoundD)
519 FoundD = nullptr;
520
521 bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
522 std::size_t Size =
523 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
524 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
525 Counts: QualifierLoc ? 1 : 0, Counts: FoundD ? 1 : 0,
526 Counts: HasTemplateKWAndArgsInfo ? 1 : 0,
527 Counts: TemplateArgs ? TemplateArgs->size() : 0);
528
529 void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
530 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
531 RefersToEnclosingVariableOrCapture, NameInfo,
532 FoundD, TemplateArgs, T, VK, NOUR);
533}
534
535DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
536 bool HasQualifier,
537 bool HasFoundDecl,
538 bool HasTemplateKWAndArgsInfo,
539 unsigned NumTemplateArgs) {
540 assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
541 std::size_t Size =
542 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
543 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
544 Counts: HasQualifier ? 1 : 0, Counts: HasFoundDecl ? 1 : 0, Counts: HasTemplateKWAndArgsInfo,
545 Counts: NumTemplateArgs);
546 void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
547 return new (Mem) DeclRefExpr(EmptyShell());
548}
549
550void DeclRefExpr::setDecl(ValueDecl *NewD) {
551 D = NewD;
552 if (getType()->isUndeducedType())
553 setType(NewD->getType());
554 setDependence(computeDependence(E: this, Ctx: NewD->getASTContext()));
555}
556
557SourceLocation DeclRefExpr::getEndLoc() const {
558 if (hasExplicitTemplateArgs())
559 return getRAngleLoc();
560 return getNameInfo().getEndLoc();
561}
562
563SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(SourceLocation OpLoc,
564 SourceLocation LParen,
565 SourceLocation RParen,
566 QualType ResultTy,
567 TypeSourceInfo *TSI)
568 : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary),
569 OpLoc(OpLoc), LParen(LParen), RParen(RParen) {
570 setTypeSourceInfo(TSI);
571 setDependence(computeDependence(E: this));
572}
573
574SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(EmptyShell Empty,
575 QualType ResultTy)
576 : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary) {}
577
578SYCLUniqueStableNameExpr *
579SYCLUniqueStableNameExpr::Create(const ASTContext &Ctx, SourceLocation OpLoc,
580 SourceLocation LParen, SourceLocation RParen,
581 TypeSourceInfo *TSI) {
582 QualType ResultTy = Ctx.getPointerType(T: Ctx.CharTy.withConst());
583 return new (Ctx)
584 SYCLUniqueStableNameExpr(OpLoc, LParen, RParen, ResultTy, TSI);
585}
586
587SYCLUniqueStableNameExpr *
588SYCLUniqueStableNameExpr::CreateEmpty(const ASTContext &Ctx) {
589 QualType ResultTy = Ctx.getPointerType(T: Ctx.CharTy.withConst());
590 return new (Ctx) SYCLUniqueStableNameExpr(EmptyShell(), ResultTy);
591}
592
593std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context) const {
594 return SYCLUniqueStableNameExpr::ComputeName(Context,
595 Ty: getTypeSourceInfo()->getType());
596}
597
598std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
599 QualType Ty) {
600 auto MangleCallback = [](ASTContext &Ctx,
601 const NamedDecl *ND) -> UnsignedOrNone {
602 if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: ND))
603 return RD->getDeviceLambdaManglingNumber();
604 return std::nullopt;
605 };
606
607 std::unique_ptr<MangleContext> Ctx{ItaniumMangleContext::create(
608 Context, Diags&: Context.getDiagnostics(), Discriminator: MangleCallback)};
609
610 std::string Buffer;
611 Buffer.reserve(res_arg: 128);
612 llvm::raw_string_ostream Out(Buffer);
613 Ctx->mangleCanonicalTypeName(T: Ty, Out);
614
615 return Buffer;
616}
617
618PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy,
619 PredefinedIdentKind IK, bool IsTransparent,
620 StringLiteral *SL)
621 : Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary) {
622 PredefinedExprBits.Kind = llvm::to_underlying(E: IK);
623 assert((getIdentKind() == IK) &&
624 "IdentKind do not fit in PredefinedExprBitfields!");
625 bool HasFunctionName = SL != nullptr;
626 PredefinedExprBits.HasFunctionName = HasFunctionName;
627 PredefinedExprBits.IsTransparent = IsTransparent;
628 PredefinedExprBits.Loc = L;
629 if (HasFunctionName)
630 setFunctionName(SL);
631 setDependence(computeDependence(E: this));
632}
633
634PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
635 : Expr(PredefinedExprClass, Empty) {
636 PredefinedExprBits.HasFunctionName = HasFunctionName;
637}
638
639PredefinedExpr *PredefinedExpr::Create(const ASTContext &Ctx, SourceLocation L,
640 QualType FNTy, PredefinedIdentKind IK,
641 bool IsTransparent, StringLiteral *SL) {
642 bool HasFunctionName = SL != nullptr;
643 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
644 Align: alignof(PredefinedExpr));
645 return new (Mem) PredefinedExpr(L, FNTy, IK, IsTransparent, SL);
646}
647
648PredefinedExpr *PredefinedExpr::CreateEmpty(const ASTContext &Ctx,
649 bool HasFunctionName) {
650 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
651 Align: alignof(PredefinedExpr));
652 return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
653}
654
655StringRef PredefinedExpr::getIdentKindName(PredefinedIdentKind IK) {
656 switch (IK) {
657 case PredefinedIdentKind::Func:
658 return "__func__";
659 case PredefinedIdentKind::Function:
660 return "__FUNCTION__";
661 case PredefinedIdentKind::FuncDName:
662 return "__FUNCDNAME__";
663 case PredefinedIdentKind::LFunction:
664 return "L__FUNCTION__";
665 case PredefinedIdentKind::PrettyFunction:
666 return "__PRETTY_FUNCTION__";
667 case PredefinedIdentKind::FuncSig:
668 return "__FUNCSIG__";
669 case PredefinedIdentKind::LFuncSig:
670 return "L__FUNCSIG__";
671 case PredefinedIdentKind::PrettyFunctionNoVirtual:
672 break;
673 }
674 llvm_unreachable("Unknown ident kind for PredefinedExpr");
675}
676
677// FIXME: Maybe this should use DeclPrinter with a special "print predefined
678// expr" policy instead.
679std::string PredefinedExpr::ComputeName(PredefinedIdentKind IK,
680 const Decl *CurrentDecl,
681 bool ForceElaboratedPrinting) {
682 ASTContext &Context = CurrentDecl->getASTContext();
683
684 if (IK == PredefinedIdentKind::FuncDName) {
685 if (const NamedDecl *ND = dyn_cast<NamedDecl>(Val: CurrentDecl)) {
686 std::unique_ptr<MangleContext> MC;
687 MC.reset(p: Context.createMangleContext());
688
689 if (MC->shouldMangleDeclName(D: ND)) {
690 SmallString<256> Buffer;
691 llvm::raw_svector_ostream Out(Buffer);
692 GlobalDecl GD;
693 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Val: ND))
694 GD = GlobalDecl(CD, Ctor_Base);
695 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(Val: ND))
696 GD = GlobalDecl(DD, Dtor_Base);
697 else if (auto FD = dyn_cast<FunctionDecl>(Val: ND)) {
698 GD = FD->isReferenceableKernel() ? GlobalDecl(FD) : GlobalDecl(ND);
699 } else
700 GD = GlobalDecl(ND);
701 MC->mangleName(GD, Out);
702
703 if (!Buffer.empty() && Buffer.front() == '\01')
704 return std::string(Buffer.substr(Start: 1));
705 return std::string(Buffer);
706 }
707 return std::string(ND->getIdentifier()->getName());
708 }
709 return "";
710 }
711 if (isa<BlockDecl>(Val: CurrentDecl)) {
712 // For blocks we only emit something if it is enclosed in a function
713 // For top-level block we'd like to include the name of variable, but we
714 // don't have it at this point.
715 auto DC = CurrentDecl->getDeclContext();
716 if (DC->isFileContext())
717 return "";
718
719 SmallString<256> Buffer;
720 llvm::raw_svector_ostream Out(Buffer);
721 if (auto *DCBlock = dyn_cast<BlockDecl>(Val: DC))
722 // For nested blocks, propagate up to the parent.
723 Out << ComputeName(IK, CurrentDecl: DCBlock);
724 else if (auto *DCDecl = dyn_cast<Decl>(Val: DC))
725 Out << ComputeName(IK, CurrentDecl: DCDecl) << "_block_invoke";
726 return std::string(Out.str());
727 }
728 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: CurrentDecl)) {
729 const auto &LO = Context.getLangOpts();
730 bool IsFuncOrFunctionInNonMSVCCompatEnv =
731 ((IK == PredefinedIdentKind::Func ||
732 IK == PredefinedIdentKind ::Function) &&
733 !LO.MSVCCompat);
734 bool IsLFunctionInMSVCCommpatEnv =
735 IK == PredefinedIdentKind::LFunction && LO.MSVCCompat;
736 bool IsFuncOrFunctionOrLFunctionOrFuncDName =
737 IK != PredefinedIdentKind::PrettyFunction &&
738 IK != PredefinedIdentKind::PrettyFunctionNoVirtual &&
739 IK != PredefinedIdentKind::FuncSig &&
740 IK != PredefinedIdentKind::LFuncSig;
741 if ((ForceElaboratedPrinting &&
742 (IsFuncOrFunctionInNonMSVCCompatEnv || IsLFunctionInMSVCCommpatEnv)) ||
743 (!ForceElaboratedPrinting && IsFuncOrFunctionOrLFunctionOrFuncDName))
744 return FD->getNameAsString();
745
746 SmallString<256> Name;
747 llvm::raw_svector_ostream Out(Name);
748
749 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
750 if (MD->isVirtual() && IK != PredefinedIdentKind::PrettyFunctionNoVirtual)
751 Out << "virtual ";
752 if (MD->isStatic() && !ForceElaboratedPrinting)
753 Out << "static ";
754 }
755
756 class PrettyCallbacks final : public PrintingCallbacks {
757 public:
758 PrettyCallbacks(const LangOptions &LO) : LO(LO) {}
759 std::string remapPath(StringRef Path) const override {
760 SmallString<128> p(Path);
761 LO.remapPathPrefix(Path&: p);
762 return std::string(p);
763 }
764
765 private:
766 const LangOptions &LO;
767 };
768 PrintingPolicy Policy(Context.getLangOpts());
769 PrettyCallbacks PrettyCB(Context.getLangOpts());
770 Policy.Callbacks = &PrettyCB;
771 if (IK == PredefinedIdentKind::Function && ForceElaboratedPrinting)
772 Policy.SuppressTagKeyword = !LO.MSVCCompat;
773 std::string Proto;
774 llvm::raw_string_ostream POut(Proto);
775
776 const FunctionDecl *Decl = FD;
777 if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
778 Decl = Pattern;
779
780 // Bail out if the type of the function has not been set yet.
781 // This can notably happen in the trailing return type of a lambda
782 // expression.
783 const Type *Ty = Decl->getType().getTypePtrOrNull();
784 if (!Ty)
785 return "";
786
787 const FunctionType *AFT = Ty->getAs<FunctionType>();
788 const FunctionProtoType *FT = nullptr;
789 if (FD->hasWrittenPrototype())
790 FT = dyn_cast<FunctionProtoType>(Val: AFT);
791
792 if (IK == PredefinedIdentKind::FuncSig ||
793 IK == PredefinedIdentKind::LFuncSig) {
794 switch (AFT->getCallConv()) {
795 case CC_C: POut << "__cdecl "; break;
796 case CC_X86StdCall: POut << "__stdcall "; break;
797 case CC_X86FastCall: POut << "__fastcall "; break;
798 case CC_X86ThisCall: POut << "__thiscall "; break;
799 case CC_X86VectorCall: POut << "__vectorcall "; break;
800 case CC_X86RegCall: POut << "__regcall "; break;
801 // Only bother printing the conventions that MSVC knows about.
802 default: break;
803 }
804 }
805
806 FD->printQualifiedName(OS&: POut, Policy);
807
808 if (IK == PredefinedIdentKind::Function) {
809 Out << Proto;
810 return std::string(Name);
811 }
812
813 POut << "(";
814 if (FT) {
815 for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
816 if (i) POut << ", ";
817 POut << Decl->getParamDecl(i)->getType().stream(Policy);
818 }
819
820 if (FT->isVariadic()) {
821 if (FD->getNumParams()) POut << ", ";
822 POut << "...";
823 } else if ((IK == PredefinedIdentKind::FuncSig ||
824 IK == PredefinedIdentKind::LFuncSig ||
825 !Context.getLangOpts().CPlusPlus) &&
826 !Decl->getNumParams()) {
827 POut << "void";
828 }
829 }
830 POut << ")";
831
832 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
833 assert(FT && "We must have a written prototype in this case.");
834 if (FT->isConst())
835 POut << " const";
836 if (FT->isVolatile())
837 POut << " volatile";
838 RefQualifierKind Ref = MD->getRefQualifier();
839 if (Ref == RQ_LValue)
840 POut << " &";
841 else if (Ref == RQ_RValue)
842 POut << " &&";
843 }
844
845 typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
846 SpecsTy Specs;
847 const DeclContext *Ctx = FD->getDeclContext();
848 while (isa_and_nonnull<NamedDecl>(Val: Ctx)) {
849 const ClassTemplateSpecializationDecl *Spec
850 = dyn_cast<ClassTemplateSpecializationDecl>(Val: Ctx);
851 if (Spec && !Spec->isExplicitSpecialization())
852 Specs.push_back(Elt: Spec);
853 Ctx = Ctx->getParent();
854 }
855
856 std::string TemplateParams;
857 llvm::raw_string_ostream TOut(TemplateParams);
858 for (const ClassTemplateSpecializationDecl *D : llvm::reverse(C&: Specs)) {
859 const TemplateParameterList *Params =
860 D->getSpecializedTemplate()->getTemplateParameters();
861 const TemplateArgumentList &Args = D->getTemplateArgs();
862 assert(Params->size() == Args.size());
863 for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
864 StringRef Param = Params->getParam(Idx: i)->getName();
865 if (Param.empty()) continue;
866 TOut << Param << " = ";
867 Args.get(Idx: i).print(Policy, Out&: TOut,
868 IncludeType: TemplateParameterList::shouldIncludeTypeForArgument(
869 Policy, TPL: Params, Idx: i));
870 TOut << ", ";
871 }
872 }
873
874 FunctionTemplateSpecializationInfo *FSI
875 = FD->getTemplateSpecializationInfo();
876 if (FSI && !FSI->isExplicitSpecialization()) {
877 const TemplateParameterList* Params
878 = FSI->getTemplate()->getTemplateParameters();
879 const TemplateArgumentList* Args = FSI->TemplateArguments;
880 assert(Params->size() == Args->size());
881 for (unsigned i = 0, e = Params->size(); i != e; ++i) {
882 StringRef Param = Params->getParam(Idx: i)->getName();
883 if (Param.empty()) continue;
884 TOut << Param << " = ";
885 Args->get(Idx: i).print(Policy, Out&: TOut, /*IncludeType*/ true);
886 TOut << ", ";
887 }
888 }
889
890 if (!TemplateParams.empty()) {
891 // remove the trailing comma and space
892 TemplateParams.resize(n: TemplateParams.size() - 2);
893 POut << " [" << TemplateParams << "]";
894 }
895
896 // Print "auto" for all deduced return types. This includes C++1y return
897 // type deduction and lambdas. For trailing return types resolve the
898 // decltype expression. Otherwise print the real type when this is
899 // not a constructor or destructor.
900 if (isLambdaMethod(DC: FD))
901 Proto = "auto " + Proto;
902 else if (FT && FT->getReturnType()->getAs<DecltypeType>())
903 FT->getReturnType()
904 ->getAs<DecltypeType>()
905 ->getUnderlyingType()
906 .getAsStringInternal(Str&: Proto, Policy);
907 else if (!isa<CXXConstructorDecl>(Val: FD) && !isa<CXXDestructorDecl>(Val: FD))
908 AFT->getReturnType().getAsStringInternal(Str&: Proto, Policy);
909
910 Out << Proto;
911
912 return std::string(Name);
913 }
914 if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(Val: CurrentDecl)) {
915 for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
916 // Skip to its enclosing function or method, but not its enclosing
917 // CapturedDecl.
918 if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
919 const Decl *D = Decl::castFromDeclContext(DC);
920 return ComputeName(IK, CurrentDecl: D);
921 }
922 llvm_unreachable("CapturedDecl not inside a function or method");
923 }
924 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Val: CurrentDecl)) {
925 SmallString<256> Name;
926 llvm::raw_svector_ostream Out(Name);
927 Out << (MD->isInstanceMethod() ? '-' : '+');
928 Out << '[';
929
930 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
931 // a null check to avoid a crash.
932 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
933 Out << *ID;
934
935 if (const ObjCCategoryImplDecl *CID =
936 dyn_cast<ObjCCategoryImplDecl>(Val: MD->getDeclContext()))
937 Out << '(' << *CID << ')';
938
939 Out << ' ';
940 MD->getSelector().print(OS&: Out);
941 Out << ']';
942
943 return std::string(Name);
944 }
945 if (isa<TranslationUnitDecl>(Val: CurrentDecl) &&
946 IK == PredefinedIdentKind::PrettyFunction) {
947 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
948 return "top level";
949 }
950 return "";
951}
952
953void APNumericStorage::setIntValue(const ASTContext &C,
954 const llvm::APInt &Val) {
955 if (hasAllocation())
956 C.Deallocate(Ptr: pVal);
957
958 BitWidth = Val.getBitWidth();
959 unsigned NumWords = Val.getNumWords();
960 const uint64_t* Words = Val.getRawData();
961 if (NumWords > 1) {
962 pVal = new (C) uint64_t[NumWords];
963 std::copy(first: Words, last: Words + NumWords, result: pVal);
964 } else if (NumWords == 1)
965 VAL = Words[0];
966 else
967 VAL = 0;
968}
969
970IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
971 QualType type, SourceLocation l)
972 : Expr(IntegerLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l) {
973 assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
974 assert(V.getBitWidth() == C.getIntWidth(type) &&
975 "Integer type is not the correct size for constant.");
976 setValue(C, Val: V);
977 setDependence(ExprDependence::None);
978}
979
980IntegerLiteral *
981IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
982 QualType type, SourceLocation l) {
983 return new (C) IntegerLiteral(C, V, type, l);
984}
985
986IntegerLiteral *
987IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
988 return new (C) IntegerLiteral(Empty);
989}
990
991FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
992 QualType type, SourceLocation l,
993 unsigned Scale)
994 : Expr(FixedPointLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l),
995 Scale(Scale) {
996 assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral");
997 assert(V.getBitWidth() == C.getTypeInfo(type).Width &&
998 "Fixed point type is not the correct size for constant.");
999 setValue(C, Val: V);
1000 setDependence(ExprDependence::None);
1001}
1002
1003FixedPointLiteral *FixedPointLiteral::CreateFromRawInt(const ASTContext &C,
1004 const llvm::APInt &V,
1005 QualType type,
1006 SourceLocation l,
1007 unsigned Scale) {
1008 return new (C) FixedPointLiteral(C, V, type, l, Scale);
1009}
1010
1011FixedPointLiteral *FixedPointLiteral::Create(const ASTContext &C,
1012 EmptyShell Empty) {
1013 return new (C) FixedPointLiteral(Empty);
1014}
1015
1016std::string FixedPointLiteral::getValueAsString(unsigned Radix) const {
1017 // Currently the longest decimal number that can be printed is the max for an
1018 // unsigned long _Accum: 4294967295.99999999976716935634613037109375
1019 // which is 43 characters.
1020 SmallString<64> S;
1021 FixedPointValueToString(
1022 Str&: S, Val: llvm::APSInt::getUnsigned(X: getValue().getZExtValue()), Scale);
1023 return std::string(S);
1024}
1025
1026void CharacterLiteral::print(unsigned Val, CharacterLiteralKind Kind,
1027 raw_ostream &OS) {
1028 switch (Kind) {
1029 case CharacterLiteralKind::Ascii:
1030 break; // no prefix.
1031 case CharacterLiteralKind::Wide:
1032 OS << 'L';
1033 break;
1034 case CharacterLiteralKind::UTF8:
1035 OS << "u8";
1036 break;
1037 case CharacterLiteralKind::UTF16:
1038 OS << 'u';
1039 break;
1040 case CharacterLiteralKind::UTF32:
1041 OS << 'U';
1042 break;
1043 }
1044
1045 StringRef Escaped = escapeCStyle<EscapeChar::Single>(Ch: Val);
1046 if (!Escaped.empty()) {
1047 OS << "'" << Escaped << "'";
1048 } else {
1049 // A character literal might be sign-extended, which
1050 // would result in an invalid \U escape sequence.
1051 // FIXME: multicharacter literals such as '\xFF\xFF\xFF\xFF'
1052 // are not correctly handled.
1053 if ((Val & ~0xFFu) == ~0xFFu && Kind == CharacterLiteralKind::Ascii)
1054 Val &= 0xFFu;
1055 if (Val < 256 && isPrintable(c: (unsigned char)Val))
1056 OS << "'" << (char)Val << "'";
1057 else if (Val < 256)
1058 OS << "'\\x" << llvm::format(Fmt: "%02x", Vals: Val) << "'";
1059 else if (Val <= 0xFFFF)
1060 OS << "'\\u" << llvm::format(Fmt: "%04x", Vals: Val) << "'";
1061 else
1062 OS << "'\\U" << llvm::format(Fmt: "%08x", Vals: Val) << "'";
1063 }
1064}
1065
1066FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
1067 bool isexact, QualType Type, SourceLocation L)
1068 : Expr(FloatingLiteralClass, Type, VK_PRValue, OK_Ordinary), Loc(L) {
1069 setSemantics(V.getSemantics());
1070 FloatingLiteralBits.IsExact = isexact;
1071 setValue(C, Val: V);
1072 setDependence(ExprDependence::None);
1073}
1074
1075FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
1076 : Expr(FloatingLiteralClass, Empty) {
1077 setRawSemantics(llvm::APFloatBase::S_IEEEhalf);
1078 FloatingLiteralBits.IsExact = false;
1079}
1080
1081FloatingLiteral *
1082FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
1083 bool isexact, QualType Type, SourceLocation L) {
1084 return new (C) FloatingLiteral(C, V, isexact, Type, L);
1085}
1086
1087FloatingLiteral *
1088FloatingLiteral::Create(const ASTContext &C, EmptyShell Empty) {
1089 return new (C) FloatingLiteral(C, Empty);
1090}
1091
1092/// getValueAsApproximateDouble - This returns the value as an inaccurate
1093/// double. Note that this may cause loss of precision, but is useful for
1094/// debugging dumps, etc.
1095double FloatingLiteral::getValueAsApproximateDouble() const {
1096 llvm::APFloat V = getValue();
1097 bool ignored;
1098 V.convert(ToSemantics: llvm::APFloat::IEEEdouble(), RM: llvm::APFloat::rmNearestTiesToEven,
1099 losesInfo: &ignored);
1100 return V.convertToDouble();
1101}
1102
1103unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
1104 StringLiteralKind SK) {
1105 unsigned CharByteWidth = 0;
1106 switch (SK) {
1107 case StringLiteralKind::Ordinary:
1108 case StringLiteralKind::UTF8:
1109 case StringLiteralKind::Binary:
1110 CharByteWidth = Target.getCharWidth();
1111 break;
1112 case StringLiteralKind::Wide:
1113 CharByteWidth = Target.getWCharWidth();
1114 break;
1115 case StringLiteralKind::UTF16:
1116 CharByteWidth = Target.getChar16Width();
1117 break;
1118 case StringLiteralKind::UTF32:
1119 CharByteWidth = Target.getChar32Width();
1120 break;
1121 case StringLiteralKind::Unevaluated:
1122 return sizeof(char); // Host;
1123 }
1124 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
1125 CharByteWidth /= 8;
1126 assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&
1127 "The only supported character byte widths are 1,2 and 4!");
1128 return CharByteWidth;
1129}
1130
1131StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
1132 StringLiteralKind Kind, bool Pascal, QualType Ty,
1133 ArrayRef<SourceLocation> Locs)
1134 : Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary) {
1135
1136 unsigned Length = Str.size();
1137
1138 StringLiteralBits.Kind = llvm::to_underlying(E: Kind);
1139 StringLiteralBits.NumConcatenated = Locs.size();
1140
1141 if (Kind != StringLiteralKind::Unevaluated) {
1142 assert(Ctx.getAsConstantArrayType(Ty) &&
1143 "StringLiteral must be of constant array type!");
1144 unsigned CharByteWidth = mapCharByteWidth(Target: Ctx.getTargetInfo(), SK: Kind);
1145 unsigned ByteLength = Str.size();
1146 assert((ByteLength % CharByteWidth == 0) &&
1147 "The size of the data must be a multiple of CharByteWidth!");
1148
1149 // Avoid the expensive division. The compiler should be able to figure it
1150 // out by itself. However as of clang 7, even with the appropriate
1151 // llvm_unreachable added just here, it is not able to do so.
1152 switch (CharByteWidth) {
1153 case 1:
1154 Length = ByteLength;
1155 break;
1156 case 2:
1157 Length = ByteLength / 2;
1158 break;
1159 case 4:
1160 Length = ByteLength / 4;
1161 break;
1162 default:
1163 llvm_unreachable("Unsupported character width!");
1164 }
1165
1166 StringLiteralBits.CharByteWidth = CharByteWidth;
1167 StringLiteralBits.IsPascal = Pascal;
1168 } else {
1169 assert(!Pascal && "Can't make an unevaluated Pascal string");
1170 StringLiteralBits.CharByteWidth = 1;
1171 StringLiteralBits.IsPascal = false;
1172 }
1173
1174 *getTrailingObjects<unsigned>() = Length;
1175
1176 // Initialize the trailing array of SourceLocation.
1177 // This is safe since SourceLocation is POD-like.
1178 llvm::copy(Range&: Locs, Out: getTrailingObjects<SourceLocation>());
1179
1180 // Initialize the trailing array of char holding the string data.
1181 llvm::copy(Range&: Str, Out: getTrailingObjects<char>());
1182
1183 setDependence(ExprDependence::None);
1184}
1185
1186StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
1187 unsigned Length, unsigned CharByteWidth)
1188 : Expr(StringLiteralClass, Empty) {
1189 StringLiteralBits.CharByteWidth = CharByteWidth;
1190 StringLiteralBits.NumConcatenated = NumConcatenated;
1191 *getTrailingObjects<unsigned>() = Length;
1192}
1193
1194StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
1195 StringLiteralKind Kind, bool Pascal,
1196 QualType Ty,
1197 ArrayRef<SourceLocation> Locs) {
1198 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1199 Counts: 1, Counts: Locs.size(), Counts: Str.size()),
1200 Align: alignof(StringLiteral));
1201 return new (Mem) StringLiteral(Ctx, Str, Kind, Pascal, Ty, Locs);
1202}
1203
1204StringLiteral *StringLiteral::CreateEmpty(const ASTContext &Ctx,
1205 unsigned NumConcatenated,
1206 unsigned Length,
1207 unsigned CharByteWidth) {
1208 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1209 Counts: 1, Counts: NumConcatenated, Counts: Length * CharByteWidth),
1210 Align: alignof(StringLiteral));
1211 return new (Mem)
1212 StringLiteral(EmptyShell(), NumConcatenated, Length, CharByteWidth);
1213}
1214
1215void StringLiteral::outputString(raw_ostream &OS) const {
1216 switch (getKind()) {
1217 case StringLiteralKind::Unevaluated:
1218 case StringLiteralKind::Ordinary:
1219 case StringLiteralKind::Binary:
1220 break; // no prefix.
1221 case StringLiteralKind::Wide:
1222 OS << 'L';
1223 break;
1224 case StringLiteralKind::UTF8:
1225 OS << "u8";
1226 break;
1227 case StringLiteralKind::UTF16:
1228 OS << 'u';
1229 break;
1230 case StringLiteralKind::UTF32:
1231 OS << 'U';
1232 break;
1233 }
1234 OS << '"';
1235 static const char Hex[] = "0123456789ABCDEF";
1236
1237 unsigned LastSlashX = getLength();
1238 for (unsigned I = 0, N = getLength(); I != N; ++I) {
1239 uint32_t Char = getCodeUnit(i: I);
1240 StringRef Escaped = escapeCStyle<EscapeChar::Double>(Ch: Char);
1241 if (Escaped.empty()) {
1242 // FIXME: Convert UTF-8 back to codepoints before rendering.
1243
1244 // Convert UTF-16 surrogate pairs back to codepoints before rendering.
1245 // Leave invalid surrogates alone; we'll use \x for those.
1246 if (getKind() == StringLiteralKind::UTF16 && I != N - 1 &&
1247 Char >= 0xd800 && Char <= 0xdbff) {
1248 uint32_t Trail = getCodeUnit(i: I + 1);
1249 if (Trail >= 0xdc00 && Trail <= 0xdfff) {
1250 Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
1251 ++I;
1252 }
1253 }
1254
1255 if (Char > 0xff) {
1256 // If this is a wide string, output characters over 0xff using \x
1257 // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
1258 // codepoint: use \x escapes for invalid codepoints.
1259 if (getKind() == StringLiteralKind::Wide ||
1260 (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
1261 // FIXME: Is this the best way to print wchar_t?
1262 OS << "\\x";
1263 int Shift = 28;
1264 while ((Char >> Shift) == 0)
1265 Shift -= 4;
1266 for (/**/; Shift >= 0; Shift -= 4)
1267 OS << Hex[(Char >> Shift) & 15];
1268 LastSlashX = I;
1269 continue;
1270 }
1271
1272 if (Char > 0xffff)
1273 OS << "\\U00"
1274 << Hex[(Char >> 20) & 15]
1275 << Hex[(Char >> 16) & 15];
1276 else
1277 OS << "\\u";
1278 OS << Hex[(Char >> 12) & 15]
1279 << Hex[(Char >> 8) & 15]
1280 << Hex[(Char >> 4) & 15]
1281 << Hex[(Char >> 0) & 15];
1282 continue;
1283 }
1284
1285 // If we used \x... for the previous character, and this character is a
1286 // hexadecimal digit, prevent it being slurped as part of the \x.
1287 if (LastSlashX + 1 == I) {
1288 switch (Char) {
1289 case '0': case '1': case '2': case '3': case '4':
1290 case '5': case '6': case '7': case '8': case '9':
1291 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
1292 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
1293 OS << "\"\"";
1294 }
1295 }
1296
1297 assert(Char <= 0xff &&
1298 "Characters above 0xff should already have been handled.");
1299
1300 if (isPrintable(c: Char))
1301 OS << (char)Char;
1302 else // Output anything hard as an octal escape.
1303 OS << '\\'
1304 << (char)('0' + ((Char >> 6) & 7))
1305 << (char)('0' + ((Char >> 3) & 7))
1306 << (char)('0' + ((Char >> 0) & 7));
1307 } else {
1308 // Handle some common non-printable cases to make dumps prettier.
1309 OS << Escaped;
1310 }
1311 }
1312 OS << '"';
1313}
1314
1315/// getLocationOfByte - Return a source location that points to the specified
1316/// byte of this string literal.
1317///
1318/// Strings are amazingly complex. They can be formed from multiple tokens and
1319/// can have escape sequences in them in addition to the usual trigraph and
1320/// escaped newline business. This routine handles this complexity.
1321///
1322/// The *StartToken sets the first token to be searched in this function and
1323/// the *StartTokenByteOffset is the byte offset of the first token. Before
1324/// returning, it updates the *StartToken to the TokNo of the token being found
1325/// and sets *StartTokenByteOffset to the byte offset of the token in the
1326/// string.
1327/// Using these two parameters can reduce the time complexity from O(n^2) to
1328/// O(n) if one wants to get the location of byte for all the tokens in a
1329/// string.
1330///
1331SourceLocation
1332StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1333 const LangOptions &Features,
1334 const TargetInfo &Target, unsigned *StartToken,
1335 unsigned *StartTokenByteOffset) const {
1336 // No source location of bytes for binary literals since they don't come from
1337 // source.
1338 if (getKind() == StringLiteralKind::Binary)
1339 return getStrTokenLoc(TokNum: 0);
1340
1341 assert((getKind() == StringLiteralKind::Ordinary ||
1342 getKind() == StringLiteralKind::UTF8 ||
1343 getKind() == StringLiteralKind::Unevaluated) &&
1344 "Only narrow string literals are currently supported");
1345
1346 // Loop over all of the tokens in this string until we find the one that
1347 // contains the byte we're looking for.
1348 unsigned TokNo = 0;
1349 unsigned StringOffset = 0;
1350 if (StartToken)
1351 TokNo = *StartToken;
1352 if (StartTokenByteOffset) {
1353 StringOffset = *StartTokenByteOffset;
1354 ByteNo -= StringOffset;
1355 }
1356 while (true) {
1357 assert(TokNo < getNumConcatenated() && "Invalid byte number!");
1358 SourceLocation StrTokLoc = getStrTokenLoc(TokNum: TokNo);
1359
1360 // Get the spelling of the string so that we can get the data that makes up
1361 // the string literal, not the identifier for the macro it is potentially
1362 // expanded through.
1363 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(Loc: StrTokLoc);
1364
1365 // Re-lex the token to get its length and original spelling.
1366 FileIDAndOffset LocInfo = SM.getDecomposedLoc(Loc: StrTokSpellingLoc);
1367 bool Invalid = false;
1368 StringRef Buffer = SM.getBufferData(FID: LocInfo.first, Invalid: &Invalid);
1369 if (Invalid) {
1370 if (StartTokenByteOffset != nullptr)
1371 *StartTokenByteOffset = StringOffset;
1372 if (StartToken != nullptr)
1373 *StartToken = TokNo;
1374 return StrTokSpellingLoc;
1375 }
1376
1377 const char *StrData = Buffer.data()+LocInfo.second;
1378
1379 // Create a lexer starting at the beginning of this token.
1380 Lexer TheLexer(SM.getLocForStartOfFile(FID: LocInfo.first), Features,
1381 Buffer.begin(), StrData, Buffer.end());
1382 Token TheTok;
1383 TheLexer.LexFromRawLexer(Result&: TheTok);
1384
1385 // Use the StringLiteralParser to compute the length of the string in bytes.
1386 StringLiteralParser SLP(TheTok, SM, Features, Target);
1387 unsigned TokNumBytes = SLP.GetStringLength();
1388
1389 // If the byte is in this token, return the location of the byte.
1390 if (ByteNo < TokNumBytes ||
1391 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
1392 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
1393
1394 // Now that we know the offset of the token in the spelling, use the
1395 // preprocessor to get the offset in the original source.
1396 if (StartTokenByteOffset != nullptr)
1397 *StartTokenByteOffset = StringOffset;
1398 if (StartToken != nullptr)
1399 *StartToken = TokNo;
1400 return Lexer::AdvanceToTokenCharacter(TokStart: StrTokLoc, Characters: Offset, SM, LangOpts: Features);
1401 }
1402
1403 // Move to the next string token.
1404 StringOffset += TokNumBytes;
1405 ++TokNo;
1406 ByteNo -= TokNumBytes;
1407 }
1408}
1409
1410/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1411/// corresponds to, e.g. "sizeof" or "[pre]++".
1412StringRef UnaryOperator::getOpcodeStr(Opcode Op) {
1413 switch (Op) {
1414#define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1415#include "clang/AST/OperationKinds.def"
1416 }
1417 llvm_unreachable("Unknown unary operator");
1418}
1419
1420UnaryOperatorKind
1421UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
1422 switch (OO) {
1423 default: llvm_unreachable("No unary operator for overloaded function");
1424 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
1425 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
1426 case OO_Amp: return UO_AddrOf;
1427 case OO_Star: return UO_Deref;
1428 case OO_Plus: return UO_Plus;
1429 case OO_Minus: return UO_Minus;
1430 case OO_Tilde: return UO_Not;
1431 case OO_Exclaim: return UO_LNot;
1432 case OO_Coawait: return UO_Coawait;
1433 }
1434}
1435
1436OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
1437 switch (Opc) {
1438 case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
1439 case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
1440 case UO_AddrOf: return OO_Amp;
1441 case UO_Deref: return OO_Star;
1442 case UO_Plus: return OO_Plus;
1443 case UO_Minus: return OO_Minus;
1444 case UO_Not: return OO_Tilde;
1445 case UO_LNot: return OO_Exclaim;
1446 case UO_Coawait: return OO_Coawait;
1447 default: return OO_None;
1448 }
1449}
1450
1451
1452//===----------------------------------------------------------------------===//
1453// Postfix Operators.
1454//===----------------------------------------------------------------------===//
1455#ifndef NDEBUG
1456static unsigned SizeOfCallExprInstance(Expr::StmtClass SC) {
1457 switch (SC) {
1458 case Expr::CallExprClass:
1459 return sizeof(CallExpr);
1460 case Expr::CXXOperatorCallExprClass:
1461 return sizeof(CXXOperatorCallExpr);
1462 case Expr::CXXMemberCallExprClass:
1463 return sizeof(CXXMemberCallExpr);
1464 case Expr::UserDefinedLiteralClass:
1465 return sizeof(UserDefinedLiteral);
1466 case Expr::CUDAKernelCallExprClass:
1467 return sizeof(CUDAKernelCallExpr);
1468 default:
1469 llvm_unreachable("unexpected class deriving from CallExpr!");
1470 }
1471}
1472#endif
1473
1474// changing the size of SourceLocation, CallExpr, and
1475// subclasses requires careful considerations
1476static_assert(sizeof(SourceLocation) == 4 && sizeof(CXXOperatorCallExpr) <= 32,
1477 "we assume CXXOperatorCallExpr is at most 32 bytes");
1478
1479CallExpr::CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
1480 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1481 SourceLocation RParenLoc, FPOptionsOverride FPFeatures,
1482 unsigned MinNumArgs, ADLCallKind UsesADL)
1483 : Expr(SC, Ty, VK, OK_Ordinary), RParenLoc(RParenLoc) {
1484 NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1485 unsigned NumPreArgs = PreArgs.size();
1486 CallExprBits.NumPreArgs = NumPreArgs;
1487 assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1488 assert(SizeOfCallExprInstance(SC) <= OffsetToTrailingObjects &&
1489 "This CallExpr subclass is too big or unsupported");
1490
1491 CallExprBits.UsesADL = static_cast<bool>(UsesADL);
1492
1493 setCallee(Fn);
1494 for (unsigned I = 0; I != NumPreArgs; ++I)
1495 setPreArg(I, PreArg: PreArgs[I]);
1496 for (unsigned I = 0; I != Args.size(); ++I)
1497 setArg(Arg: I, ArgExpr: Args[I]);
1498 for (unsigned I = Args.size(); I != NumArgs; ++I)
1499 setArg(Arg: I, ArgExpr: nullptr);
1500
1501 this->computeDependence();
1502
1503 CallExprBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
1504 CallExprBits.IsCoroElideSafe = false;
1505 CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1506 CallExprBits.HasTrailingSourceLoc = false;
1507
1508 if (hasStoredFPFeatures())
1509 setStoredFPFeatures(FPFeatures);
1510}
1511
1512CallExpr::CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
1513 bool HasFPFeatures, EmptyShell Empty)
1514 : Expr(SC, Empty), NumArgs(NumArgs) {
1515 CallExprBits.NumPreArgs = NumPreArgs;
1516 assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1517 CallExprBits.HasFPFeatures = HasFPFeatures;
1518 CallExprBits.IsCoroElideSafe = false;
1519 CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1520 CallExprBits.HasTrailingSourceLoc = false;
1521}
1522
1523CallExpr *CallExpr::Create(const ASTContext &Ctx, Expr *Fn,
1524 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1525 SourceLocation RParenLoc,
1526 FPOptionsOverride FPFeatures, unsigned MinNumArgs,
1527 ADLCallKind UsesADL) {
1528 unsigned NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1529 unsigned SizeOfTrailingObjects = CallExpr::sizeOfTrailingObjects(
1530 /*NumPreArgs=*/0, NumArgs, HasFPFeatures: FPFeatures.requiresTrailingStorage());
1531 void *Mem = Ctx.Allocate(
1532 Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1533 Align: alignof(CallExpr));
1534 CallExpr *E =
1535 new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
1536 RParenLoc, FPFeatures, MinNumArgs, UsesADL);
1537 E->updateTrailingSourceLoc();
1538 return E;
1539}
1540
1541CallExpr *CallExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
1542 bool HasFPFeatures, EmptyShell Empty) {
1543 unsigned SizeOfTrailingObjects =
1544 CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs, HasFPFeatures);
1545 void *Mem = Ctx.Allocate(
1546 Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1547 Align: alignof(CallExpr));
1548 return new (Mem)
1549 CallExpr(CallExprClass, /*NumPreArgs=*/0, NumArgs, HasFPFeatures, Empty);
1550}
1551
1552Decl *Expr::getReferencedDeclOfCallee() {
1553
1554 // Optimize for the common case first
1555 // (simple function or member function call)
1556 // then try more exotic possibilities.
1557 Expr *CEE = IgnoreImpCasts();
1558
1559 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1560 return DRE->getDecl();
1561
1562 if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1563 return ME->getMemberDecl();
1564
1565 CEE = CEE->IgnoreParens();
1566
1567 while (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: CEE))
1568 CEE = NTTP->getReplacement()->IgnoreParenImpCasts();
1569
1570 // If we're calling a dereference, look at the pointer instead.
1571 while (true) {
1572 if (auto *BO = dyn_cast<BinaryOperator>(Val: CEE)) {
1573 if (BO->isPtrMemOp()) {
1574 CEE = BO->getRHS()->IgnoreParenImpCasts();
1575 continue;
1576 }
1577 } else if (auto *UO = dyn_cast<UnaryOperator>(Val: CEE)) {
1578 if (UO->getOpcode() == UO_Deref || UO->getOpcode() == UO_AddrOf ||
1579 UO->getOpcode() == UO_Plus) {
1580 CEE = UO->getSubExpr()->IgnoreParenImpCasts();
1581 continue;
1582 }
1583 }
1584 break;
1585 }
1586
1587 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1588 return DRE->getDecl();
1589 if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1590 return ME->getMemberDecl();
1591 if (auto *BE = dyn_cast<BlockExpr>(Val: CEE))
1592 return BE->getBlockDecl();
1593
1594 return nullptr;
1595}
1596
1597/// If this is a call to a builtin, return the builtin ID. If not, return 0.
1598unsigned CallExpr::getBuiltinCallee() const {
1599 const auto *FDecl = getDirectCallee();
1600 return FDecl ? FDecl->getBuiltinID() : 0;
1601}
1602
1603bool CallExpr::isUnevaluatedBuiltinCall(const ASTContext &Ctx) const {
1604 if (unsigned BI = getBuiltinCallee())
1605 return Ctx.BuiltinInfo.isUnevaluated(ID: BI);
1606 return false;
1607}
1608
1609QualType CallExpr::getCallReturnType(const ASTContext &Ctx) const {
1610 const Expr *Callee = getCallee();
1611 QualType CalleeType = Callee->getType();
1612 if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
1613 CalleeType = FnTypePtr->getPointeeType();
1614 } else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
1615 CalleeType = BPT->getPointeeType();
1616 } else if (CalleeType->isSpecificPlaceholderType(K: BuiltinType::BoundMember)) {
1617 if (isa<CXXPseudoDestructorExpr>(Val: Callee->IgnoreParens()))
1618 return Ctx.VoidTy;
1619
1620 if (isa<UnresolvedMemberExpr>(Val: Callee->IgnoreParens()))
1621 return Ctx.DependentTy;
1622
1623 // This should never be overloaded and so should never return null.
1624 CalleeType = Expr::findBoundMemberType(expr: Callee);
1625 assert(!CalleeType.isNull());
1626 } else if (CalleeType->isRecordType()) {
1627 // If the Callee is a record type, then it is a not-yet-resolved
1628 // dependent call to the call operator of that type.
1629 return Ctx.DependentTy;
1630 } else if (CalleeType->isDependentType() ||
1631 CalleeType->isSpecificPlaceholderType(K: BuiltinType::Overload)) {
1632 return Ctx.DependentTy;
1633 }
1634
1635 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
1636 return FnType->getReturnType();
1637}
1638
1639std::pair<const NamedDecl *, const WarnUnusedResultAttr *>
1640Expr::getUnusedResultAttrImpl(const Decl *Callee, QualType ReturnType) {
1641 // If the callee is marked nodiscard, return that attribute
1642 if (Callee != nullptr)
1643 if (const auto *A = Callee->getAttr<WarnUnusedResultAttr>())
1644 return {nullptr, A};
1645
1646 // If the return type is a struct, union, or enum that is marked nodiscard,
1647 // then return the return type attribute.
1648 if (const TagDecl *TD = ReturnType->getAsTagDecl())
1649 if (const auto *A = TD->getAttr<WarnUnusedResultAttr>())
1650 return {TD, A};
1651
1652 for (const auto *TD = ReturnType->getAs<TypedefType>(); TD;
1653 TD = TD->desugar()->getAs<TypedefType>())
1654 if (const auto *A = TD->getDecl()->getAttr<WarnUnusedResultAttr>())
1655 return {TD->getDecl(), A};
1656 return {nullptr, nullptr};
1657}
1658
1659OffsetOfExpr *OffsetOfExpr::Create(const ASTContext &C, QualType type,
1660 SourceLocation OperatorLoc,
1661 TypeSourceInfo *tsi,
1662 ArrayRef<OffsetOfNode> comps,
1663 ArrayRef<Expr*> exprs,
1664 SourceLocation RParenLoc) {
1665 void *Mem = C.Allocate(
1666 Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: comps.size(), Counts: exprs.size()));
1667
1668 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
1669 RParenLoc);
1670}
1671
1672OffsetOfExpr *OffsetOfExpr::CreateEmpty(const ASTContext &C,
1673 unsigned numComps, unsigned numExprs) {
1674 void *Mem =
1675 C.Allocate(Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: numComps, Counts: numExprs));
1676 return new (Mem) OffsetOfExpr(numComps, numExprs);
1677}
1678
1679OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
1680 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1681 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr *> exprs,
1682 SourceLocation RParenLoc)
1683 : Expr(OffsetOfExprClass, type, VK_PRValue, OK_Ordinary),
1684 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
1685 NumComps(comps.size()), NumExprs(exprs.size()) {
1686 for (unsigned i = 0; i != comps.size(); ++i)
1687 setComponent(Idx: i, ON: comps[i]);
1688 for (unsigned i = 0; i != exprs.size(); ++i)
1689 setIndexExpr(Idx: i, E: exprs[i]);
1690
1691 setDependence(computeDependence(E: this));
1692}
1693
1694const IdentifierInfo *OffsetOfNode::getFieldName() const {
1695 assert(getKind() == Field || getKind() == Identifier);
1696 if (getKind() == Field)
1697 return getField()->getIdentifier();
1698
1699 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1700}
1701
1702UnaryExprOrTypeTraitExpr::UnaryExprOrTypeTraitExpr(
1703 UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
1704 SourceLocation op, SourceLocation rp)
1705 : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_PRValue, OK_Ordinary),
1706 OpLoc(op), RParenLoc(rp) {
1707 assert(ExprKind <= UETT_Last && "invalid enum value!");
1708 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1709 assert(static_cast<unsigned>(ExprKind) == UnaryExprOrTypeTraitExprBits.Kind &&
1710 "UnaryExprOrTypeTraitExprBits.Kind overflow!");
1711 UnaryExprOrTypeTraitExprBits.IsType = false;
1712 Argument.Ex = E;
1713 setDependence(computeDependence(E: this));
1714}
1715
1716MemberExpr::MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1717 NestedNameSpecifierLoc QualifierLoc,
1718 SourceLocation TemplateKWLoc, ValueDecl *MemberDecl,
1719 DeclAccessPair FoundDecl,
1720 const DeclarationNameInfo &NameInfo,
1721 const TemplateArgumentListInfo *TemplateArgs, QualType T,
1722 ExprValueKind VK, ExprObjectKind OK,
1723 NonOdrUseReason NOUR)
1724 : Expr(MemberExprClass, T, VK, OK), Base(Base), MemberDecl(MemberDecl),
1725 MemberDNLoc(NameInfo.getInfo()), MemberLoc(NameInfo.getLoc()) {
1726 assert(!NameInfo.getName() ||
1727 MemberDecl->getDeclName() == NameInfo.getName());
1728 MemberExprBits.IsArrow = IsArrow;
1729 MemberExprBits.HasQualifier = QualifierLoc.hasQualifier();
1730 MemberExprBits.HasFoundDecl =
1731 FoundDecl.getDecl() != MemberDecl ||
1732 FoundDecl.getAccess() != MemberDecl->getAccess();
1733 MemberExprBits.HasTemplateKWAndArgsInfo =
1734 TemplateArgs || TemplateKWLoc.isValid();
1735 MemberExprBits.HadMultipleCandidates = false;
1736 MemberExprBits.NonOdrUseReason = NOUR;
1737 MemberExprBits.OperatorLoc = OperatorLoc;
1738
1739 if (hasQualifier())
1740 new (getTrailingObjects<NestedNameSpecifierLoc>())
1741 NestedNameSpecifierLoc(QualifierLoc);
1742 if (hasFoundDecl())
1743 *getTrailingObjects<DeclAccessPair>() = FoundDecl;
1744 if (TemplateArgs) {
1745 auto Deps = TemplateArgumentDependence::None;
1746 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1747 TemplateKWLoc, List: *TemplateArgs, OutArgArray: getTrailingObjects<TemplateArgumentLoc>(),
1748 Deps);
1749 } else if (TemplateKWLoc.isValid()) {
1750 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1751 TemplateKWLoc);
1752 }
1753 setDependence(computeDependence(E: this));
1754}
1755
1756MemberExpr *MemberExpr::Create(
1757 const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1758 NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1759 ValueDecl *MemberDecl, DeclAccessPair FoundDecl,
1760 DeclarationNameInfo NameInfo, const TemplateArgumentListInfo *TemplateArgs,
1761 QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR) {
1762 bool HasQualifier = QualifierLoc.hasQualifier();
1763 bool HasFoundDecl = FoundDecl.getDecl() != MemberDecl ||
1764 FoundDecl.getAccess() != MemberDecl->getAccess();
1765 bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1766 std::size_t Size =
1767 totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1768 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1769 Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1770 Counts: TemplateArgs ? TemplateArgs->size() : 0);
1771
1772 void *Mem = C.Allocate(Size, Align: alignof(MemberExpr));
1773 return new (Mem) MemberExpr(Base, IsArrow, OperatorLoc, QualifierLoc,
1774 TemplateKWLoc, MemberDecl, FoundDecl, NameInfo,
1775 TemplateArgs, T, VK, OK, NOUR);
1776}
1777
1778MemberExpr *MemberExpr::CreateEmpty(const ASTContext &Context,
1779 bool HasQualifier, bool HasFoundDecl,
1780 bool HasTemplateKWAndArgsInfo,
1781 unsigned NumTemplateArgs) {
1782 assert((!NumTemplateArgs || HasTemplateKWAndArgsInfo) &&
1783 "template args but no template arg info?");
1784 std::size_t Size =
1785 totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1786 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1787 Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1788 Counts: NumTemplateArgs);
1789 void *Mem = Context.Allocate(Size, Align: alignof(MemberExpr));
1790 return new (Mem) MemberExpr(EmptyShell());
1791}
1792
1793void MemberExpr::setMemberDecl(ValueDecl *NewD) {
1794 MemberDecl = NewD;
1795 if (getType()->isUndeducedType())
1796 setType(NewD->getType());
1797 setDependence(computeDependence(E: this));
1798}
1799
1800SourceLocation MemberExpr::getBeginLoc() const {
1801 if (isImplicitAccess()) {
1802 if (hasQualifier())
1803 return getQualifierLoc().getBeginLoc();
1804 return MemberLoc;
1805 }
1806
1807 // FIXME: We don't want this to happen. Rather, we should be able to
1808 // detect all kinds of implicit accesses more cleanly.
1809 SourceLocation BaseStartLoc = getBase()->getBeginLoc();
1810 if (BaseStartLoc.isValid())
1811 return BaseStartLoc;
1812 return MemberLoc;
1813}
1814SourceLocation MemberExpr::getEndLoc() const {
1815 SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
1816 if (hasExplicitTemplateArgs())
1817 EndLoc = getRAngleLoc();
1818 else if (EndLoc.isInvalid())
1819 EndLoc = getBase()->getEndLoc();
1820 return EndLoc;
1821}
1822
1823bool CastExpr::CastConsistency() const {
1824 switch (getCastKind()) {
1825 case CK_DerivedToBase:
1826 case CK_UncheckedDerivedToBase:
1827 case CK_DerivedToBaseMemberPointer:
1828 case CK_BaseToDerived:
1829 case CK_BaseToDerivedMemberPointer:
1830 assert(!path_empty() && "Cast kind should have a base path!");
1831 break;
1832
1833 case CK_CPointerToObjCPointerCast:
1834 assert(getType()->isObjCObjectPointerType());
1835 assert(getSubExpr()->getType()->isPointerType());
1836 goto CheckNoBasePath;
1837
1838 case CK_BlockPointerToObjCPointerCast:
1839 assert(getType()->isObjCObjectPointerType());
1840 assert(getSubExpr()->getType()->isBlockPointerType());
1841 goto CheckNoBasePath;
1842
1843 case CK_ReinterpretMemberPointer:
1844 assert(getType()->isMemberPointerType());
1845 assert(getSubExpr()->getType()->isMemberPointerType());
1846 goto CheckNoBasePath;
1847
1848 case CK_BitCast:
1849 // Arbitrary casts to C pointer types count as bitcasts.
1850 // Otherwise, we should only have block and ObjC pointer casts
1851 // here if they stay within the type kind.
1852 if (!getType()->isPointerType()) {
1853 assert(getType()->isObjCObjectPointerType() ==
1854 getSubExpr()->getType()->isObjCObjectPointerType());
1855 assert(getType()->isBlockPointerType() ==
1856 getSubExpr()->getType()->isBlockPointerType());
1857 }
1858 goto CheckNoBasePath;
1859
1860 case CK_AnyPointerToBlockPointerCast:
1861 assert(getType()->isBlockPointerType());
1862 assert(getSubExpr()->getType()->isAnyPointerType() &&
1863 !getSubExpr()->getType()->isBlockPointerType());
1864 goto CheckNoBasePath;
1865
1866 case CK_CopyAndAutoreleaseBlockObject:
1867 assert(getType()->isBlockPointerType());
1868 assert(getSubExpr()->getType()->isBlockPointerType());
1869 goto CheckNoBasePath;
1870
1871 case CK_FunctionToPointerDecay:
1872 assert(getType()->isPointerType());
1873 assert(getSubExpr()->getType()->isFunctionType());
1874 goto CheckNoBasePath;
1875
1876 case CK_AddressSpaceConversion: {
1877 auto Ty = getType();
1878 auto SETy = getSubExpr()->getType();
1879 assert(getValueKindForType(Ty) == Expr::getValueKindForType(SETy));
1880 if (isPRValue() && !Ty->isDependentType() && !SETy->isDependentType()) {
1881 Ty = Ty->getPointeeType();
1882 SETy = SETy->getPointeeType();
1883 }
1884 assert((Ty->isDependentType() || SETy->isDependentType()) ||
1885 (!Ty.isNull() && !SETy.isNull() &&
1886 Ty.getAddressSpace() != SETy.getAddressSpace()));
1887 goto CheckNoBasePath;
1888 }
1889 // These should not have an inheritance path.
1890 case CK_Dynamic:
1891 case CK_ToUnion:
1892 case CK_ArrayToPointerDecay:
1893 case CK_NullToMemberPointer:
1894 case CK_NullToPointer:
1895 case CK_ConstructorConversion:
1896 case CK_IntegralToPointer:
1897 case CK_PointerToIntegral:
1898 case CK_ToVoid:
1899 case CK_VectorSplat:
1900 case CK_IntegralCast:
1901 case CK_BooleanToSignedIntegral:
1902 case CK_IntegralToFloating:
1903 case CK_FloatingToIntegral:
1904 case CK_FloatingCast:
1905 case CK_ObjCObjectLValueCast:
1906 case CK_FloatingRealToComplex:
1907 case CK_FloatingComplexToReal:
1908 case CK_FloatingComplexCast:
1909 case CK_FloatingComplexToIntegralComplex:
1910 case CK_IntegralRealToComplex:
1911 case CK_IntegralComplexToReal:
1912 case CK_IntegralComplexCast:
1913 case CK_IntegralComplexToFloatingComplex:
1914 case CK_ARCProduceObject:
1915 case CK_ARCConsumeObject:
1916 case CK_ARCReclaimReturnedObject:
1917 case CK_ARCExtendBlockObject:
1918 case CK_ZeroToOCLOpaqueType:
1919 case CK_IntToOCLSampler:
1920 case CK_FloatingToFixedPoint:
1921 case CK_FixedPointToFloating:
1922 case CK_FixedPointCast:
1923 case CK_FixedPointToIntegral:
1924 case CK_IntegralToFixedPoint:
1925 case CK_MatrixCast:
1926 assert(!getType()->isBooleanType() && "unheralded conversion to bool");
1927 goto CheckNoBasePath;
1928
1929 case CK_Dependent:
1930 case CK_LValueToRValue:
1931 case CK_NoOp:
1932 case CK_AtomicToNonAtomic:
1933 case CK_NonAtomicToAtomic:
1934 case CK_PointerToBoolean:
1935 case CK_IntegralToBoolean:
1936 case CK_FloatingToBoolean:
1937 case CK_MemberPointerToBoolean:
1938 case CK_FloatingComplexToBoolean:
1939 case CK_IntegralComplexToBoolean:
1940 case CK_LValueBitCast: // -> bool&
1941 case CK_LValueToRValueBitCast:
1942 case CK_UserDefinedConversion: // operator bool()
1943 case CK_BuiltinFnToFnPtr:
1944 case CK_FixedPointToBoolean:
1945 case CK_HLSLArrayRValue:
1946 case CK_HLSLVectorTruncation:
1947 case CK_HLSLMatrixTruncation:
1948 case CK_HLSLElementwiseCast:
1949 case CK_HLSLAggregateSplatCast:
1950 CheckNoBasePath:
1951 assert(path_empty() && "Cast kind should not have a base path!");
1952 break;
1953 }
1954 return true;
1955}
1956
1957const char *CastExpr::getCastKindName(CastKind CK) {
1958 switch (CK) {
1959#define CAST_OPERATION(Name) case CK_##Name: return #Name;
1960#include "clang/AST/OperationKinds.def"
1961 }
1962 llvm_unreachable("Unhandled cast kind!");
1963}
1964
1965namespace {
1966// Skip over implicit nodes produced as part of semantic analysis.
1967// Designed for use with IgnoreExprNodes.
1968static Expr *ignoreImplicitSemaNodes(Expr *E) {
1969 if (auto *Materialize = dyn_cast<MaterializeTemporaryExpr>(Val: E))
1970 return Materialize->getSubExpr();
1971
1972 if (auto *Binder = dyn_cast<CXXBindTemporaryExpr>(Val: E))
1973 return Binder->getSubExpr();
1974
1975 if (auto *Full = dyn_cast<FullExpr>(Val: E))
1976 return Full->getSubExpr();
1977
1978 if (auto *CPLIE = dyn_cast<CXXParenListInitExpr>(Val: E);
1979 CPLIE && CPLIE->getInitExprs().size() == 1)
1980 return CPLIE->getInitExprs()[0];
1981
1982 return E;
1983}
1984} // namespace
1985
1986Expr *CastExpr::getSubExprAsWritten() {
1987 const Expr *SubExpr = nullptr;
1988
1989 for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
1990 SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
1991
1992 // Conversions by constructor and conversion functions have a
1993 // subexpression describing the call; strip it off.
1994 if (E->getCastKind() == CK_ConstructorConversion) {
1995 SubExpr = IgnoreExprNodes(E: cast<CXXConstructExpr>(Val: SubExpr)->getArg(Arg: 0),
1996 Fns&: ignoreImplicitSemaNodes);
1997 } else if (E->getCastKind() == CK_UserDefinedConversion) {
1998 assert((isa<CallExpr, BlockExpr>(SubExpr)) &&
1999 "Unexpected SubExpr for CK_UserDefinedConversion.");
2000 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
2001 SubExpr = MCE->getImplicitObjectArgument();
2002 }
2003 }
2004
2005 return const_cast<Expr *>(SubExpr);
2006}
2007
2008NamedDecl *CastExpr::getConversionFunction() const {
2009 const Expr *SubExpr = nullptr;
2010
2011 for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
2012 SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
2013
2014 if (E->getCastKind() == CK_ConstructorConversion)
2015 return cast<CXXConstructExpr>(Val: SubExpr)->getConstructor();
2016
2017 if (E->getCastKind() == CK_UserDefinedConversion) {
2018 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
2019 return MCE->getMethodDecl();
2020 }
2021 }
2022
2023 return nullptr;
2024}
2025
2026CXXBaseSpecifier **CastExpr::path_buffer() {
2027 switch (getStmtClass()) {
2028#define ABSTRACT_STMT(x)
2029#define CASTEXPR(Type, Base) \
2030 case Stmt::Type##Class: \
2031 return static_cast<Type *>(this) \
2032 ->getTrailingObjectsNonStrict<CXXBaseSpecifier *>();
2033#define STMT(Type, Base)
2034#include "clang/AST/StmtNodes.inc"
2035 default:
2036 llvm_unreachable("non-cast expressions not possible here");
2037 }
2038}
2039
2040const FieldDecl *CastExpr::getTargetFieldForToUnionCast(QualType unionType,
2041 QualType opType) {
2042 return getTargetFieldForToUnionCast(RD: unionType->castAsRecordDecl(), opType);
2043}
2044
2045const FieldDecl *CastExpr::getTargetFieldForToUnionCast(const RecordDecl *RD,
2046 QualType OpType) {
2047 auto &Ctx = RD->getASTContext();
2048 RecordDecl::field_iterator Field, FieldEnd;
2049 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
2050 Field != FieldEnd; ++Field) {
2051 if (Ctx.hasSameUnqualifiedType(T1: Field->getType(), T2: OpType) &&
2052 !Field->isUnnamedBitField()) {
2053 return *Field;
2054 }
2055 }
2056 return nullptr;
2057}
2058
2059FPOptionsOverride *CastExpr::getTrailingFPFeatures() {
2060 assert(hasStoredFPFeatures());
2061 switch (getStmtClass()) {
2062 case ImplicitCastExprClass:
2063 return static_cast<ImplicitCastExpr *>(this)
2064 ->getTrailingObjects<FPOptionsOverride>();
2065 case CStyleCastExprClass:
2066 return static_cast<CStyleCastExpr *>(this)
2067 ->getTrailingObjects<FPOptionsOverride>();
2068 case CXXFunctionalCastExprClass:
2069 return static_cast<CXXFunctionalCastExpr *>(this)
2070 ->getTrailingObjects<FPOptionsOverride>();
2071 case CXXStaticCastExprClass:
2072 return static_cast<CXXStaticCastExpr *>(this)
2073 ->getTrailingObjects<FPOptionsOverride>();
2074 default:
2075 llvm_unreachable("Cast does not have FPFeatures");
2076 }
2077}
2078
2079ImplicitCastExpr *ImplicitCastExpr::Create(const ASTContext &C, QualType T,
2080 CastKind Kind, Expr *Operand,
2081 const CXXCastPath *BasePath,
2082 ExprValueKind VK,
2083 FPOptionsOverride FPO) {
2084 unsigned PathSize = (BasePath ? BasePath->size() : 0);
2085 void *Buffer =
2086 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2087 Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2088 // Per C++ [conv.lval]p3, lvalue-to-rvalue conversions on class and
2089 // std::nullptr_t have special semantics not captured by CK_LValueToRValue.
2090 assert((Kind != CK_LValueToRValue ||
2091 !(T->isNullPtrType() ||
2092 (T->getAsCXXRecordDecl() && !C.getLangOpts().HLSL))) &&
2093 "invalid type for lvalue-to-rvalue conversion");
2094 ImplicitCastExpr *E =
2095 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, FPO, VK);
2096 if (PathSize)
2097 llvm::uninitialized_copy(Src: *BasePath,
2098 Dst: E->getTrailingObjects<CXXBaseSpecifier *>());
2099 return E;
2100}
2101
2102ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(const ASTContext &C,
2103 unsigned PathSize,
2104 bool HasFPFeatures) {
2105 void *Buffer =
2106 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2107 Counts: PathSize, Counts: HasFPFeatures));
2108 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2109}
2110
2111CStyleCastExpr *CStyleCastExpr::Create(const ASTContext &C, QualType T,
2112 ExprValueKind VK, CastKind K, Expr *Op,
2113 const CXXCastPath *BasePath,
2114 FPOptionsOverride FPO,
2115 TypeSourceInfo *WrittenTy,
2116 SourceLocation L, SourceLocation R) {
2117 unsigned PathSize = (BasePath ? BasePath->size() : 0);
2118 void *Buffer =
2119 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2120 Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2121 CStyleCastExpr *E =
2122 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, FPO, WrittenTy, L, R);
2123 if (PathSize)
2124 llvm::uninitialized_copy(Src: *BasePath,
2125 Dst: E->getTrailingObjects<CXXBaseSpecifier *>());
2126 return E;
2127}
2128
2129CStyleCastExpr *CStyleCastExpr::CreateEmpty(const ASTContext &C,
2130 unsigned PathSize,
2131 bool HasFPFeatures) {
2132 void *Buffer =
2133 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2134 Counts: PathSize, Counts: HasFPFeatures));
2135 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2136}
2137
2138/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2139/// corresponds to, e.g. "<<=".
2140StringRef BinaryOperator::getOpcodeStr(Opcode Op) {
2141 switch (Op) {
2142#define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
2143#include "clang/AST/OperationKinds.def"
2144 }
2145 llvm_unreachable("Invalid OpCode!");
2146}
2147
2148BinaryOperatorKind
2149BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
2150 switch (OO) {
2151 default: llvm_unreachable("Not an overloadable binary operator");
2152 case OO_Plus: return BO_Add;
2153 case OO_Minus: return BO_Sub;
2154 case OO_Star: return BO_Mul;
2155 case OO_Slash: return BO_Div;
2156 case OO_Percent: return BO_Rem;
2157 case OO_Caret: return BO_Xor;
2158 case OO_Amp: return BO_And;
2159 case OO_Pipe: return BO_Or;
2160 case OO_Equal: return BO_Assign;
2161 case OO_Spaceship: return BO_Cmp;
2162 case OO_Less: return BO_LT;
2163 case OO_Greater: return BO_GT;
2164 case OO_PlusEqual: return BO_AddAssign;
2165 case OO_MinusEqual: return BO_SubAssign;
2166 case OO_StarEqual: return BO_MulAssign;
2167 case OO_SlashEqual: return BO_DivAssign;
2168 case OO_PercentEqual: return BO_RemAssign;
2169 case OO_CaretEqual: return BO_XorAssign;
2170 case OO_AmpEqual: return BO_AndAssign;
2171 case OO_PipeEqual: return BO_OrAssign;
2172 case OO_LessLess: return BO_Shl;
2173 case OO_GreaterGreater: return BO_Shr;
2174 case OO_LessLessEqual: return BO_ShlAssign;
2175 case OO_GreaterGreaterEqual: return BO_ShrAssign;
2176 case OO_EqualEqual: return BO_EQ;
2177 case OO_ExclaimEqual: return BO_NE;
2178 case OO_LessEqual: return BO_LE;
2179 case OO_GreaterEqual: return BO_GE;
2180 case OO_AmpAmp: return BO_LAnd;
2181 case OO_PipePipe: return BO_LOr;
2182 case OO_Comma: return BO_Comma;
2183 case OO_ArrowStar: return BO_PtrMemI;
2184 }
2185}
2186
2187OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
2188 static const OverloadedOperatorKind OverOps[] = {
2189 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
2190 OO_Star, OO_Slash, OO_Percent,
2191 OO_Plus, OO_Minus,
2192 OO_LessLess, OO_GreaterGreater,
2193 OO_Spaceship,
2194 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
2195 OO_EqualEqual, OO_ExclaimEqual,
2196 OO_Amp,
2197 OO_Caret,
2198 OO_Pipe,
2199 OO_AmpAmp,
2200 OO_PipePipe,
2201 OO_Equal, OO_StarEqual,
2202 OO_SlashEqual, OO_PercentEqual,
2203 OO_PlusEqual, OO_MinusEqual,
2204 OO_LessLessEqual, OO_GreaterGreaterEqual,
2205 OO_AmpEqual, OO_CaretEqual,
2206 OO_PipeEqual,
2207 OO_Comma
2208 };
2209 return OverOps[Opc];
2210}
2211
2212bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
2213 Opcode Opc,
2214 const Expr *LHS,
2215 const Expr *RHS) {
2216 if (Opc != BO_Add)
2217 return false;
2218
2219 // Check that we have one pointer and one integer operand.
2220 const Expr *PExp;
2221 if (LHS->getType()->isPointerType()) {
2222 if (!RHS->getType()->isIntegerType())
2223 return false;
2224 PExp = LHS;
2225 } else if (RHS->getType()->isPointerType()) {
2226 if (!LHS->getType()->isIntegerType())
2227 return false;
2228 PExp = RHS;
2229 } else {
2230 return false;
2231 }
2232
2233 // Workaround for old glibc's __PTR_ALIGN macro
2234 if (auto *Select =
2235 dyn_cast<ConditionalOperator>(Val: PExp->IgnoreParenNoopCasts(Ctx))) {
2236 // If the condition can be constant evaluated, we check the selected arm.
2237 bool EvalResult;
2238 if (!Select->getCond()->EvaluateAsBooleanCondition(Result&: EvalResult, Ctx))
2239 return false;
2240 PExp = EvalResult ? Select->getTrueExpr() : Select->getFalseExpr();
2241 }
2242
2243 // Check that the pointer is a nullptr.
2244 if (!PExp->IgnoreParenCasts()
2245 ->isNullPointerConstant(Ctx, NPC: Expr::NPC_ValueDependentIsNotNull))
2246 return false;
2247
2248 // Check that the pointee type is char-sized.
2249 const PointerType *PTy = PExp->getType()->getAs<PointerType>();
2250 if (!PTy || !PTy->getPointeeType()->isCharType())
2251 return false;
2252
2253 return true;
2254}
2255
2256SourceLocExpr::SourceLocExpr(const ASTContext &Ctx, SourceLocIdentKind Kind,
2257 QualType ResultTy, SourceLocation BLoc,
2258 SourceLocation RParenLoc,
2259 DeclContext *ParentContext)
2260 : Expr(SourceLocExprClass, ResultTy, VK_PRValue, OK_Ordinary),
2261 BuiltinLoc(BLoc), RParenLoc(RParenLoc), ParentContext(ParentContext) {
2262 SourceLocExprBits.Kind = llvm::to_underlying(E: Kind);
2263 // In dependent contexts, function names may change.
2264 setDependence(MayBeDependent(Kind) && ParentContext->isDependentContext()
2265 ? ExprDependence::ValueInstantiation
2266 : ExprDependence::None);
2267}
2268
2269StringRef SourceLocExpr::getBuiltinStr() const {
2270 switch (getIdentKind()) {
2271 case SourceLocIdentKind::File:
2272 return "__builtin_FILE";
2273 case SourceLocIdentKind::FileName:
2274 return "__builtin_FILE_NAME";
2275 case SourceLocIdentKind::Function:
2276 return "__builtin_FUNCTION";
2277 case SourceLocIdentKind::FuncSig:
2278 return "__builtin_FUNCSIG";
2279 case SourceLocIdentKind::Line:
2280 return "__builtin_LINE";
2281 case SourceLocIdentKind::Column:
2282 return "__builtin_COLUMN";
2283 case SourceLocIdentKind::SourceLocStruct:
2284 return "__builtin_source_location";
2285 }
2286 llvm_unreachable("unexpected IdentKind!");
2287}
2288
2289APValue SourceLocExpr::EvaluateInContext(const ASTContext &Ctx,
2290 const Expr *DefaultExpr) const {
2291 SourceLocation Loc;
2292 const DeclContext *Context;
2293
2294 if (const auto *DIE = dyn_cast_if_present<CXXDefaultInitExpr>(Val: DefaultExpr)) {
2295 Loc = DIE->getUsedLocation();
2296 Context = DIE->getUsedContext();
2297 } else if (const auto *DAE =
2298 dyn_cast_if_present<CXXDefaultArgExpr>(Val: DefaultExpr)) {
2299 Loc = DAE->getUsedLocation();
2300 Context = DAE->getUsedContext();
2301 } else {
2302 Loc = getLocation();
2303 Context = getParentContext();
2304 }
2305
2306 // If we are currently parsing a lambda declarator, we might not have a fully
2307 // formed call operator declaration yet, and we could not form a function name
2308 // for it. Because we do not have access to Sema/function scopes here, we
2309 // detect this case by relying on the fact such method doesn't yet have a
2310 // type.
2311 if (const auto *D = dyn_cast<CXXMethodDecl>(Val: Context);
2312 D && D->getFunctionTypeLoc().isNull() && isLambdaCallOperator(MD: D))
2313 Context = D->getParent()->getParent();
2314
2315 PresumedLoc PLoc = Ctx.getSourceManager().getPresumedLoc(
2316 Loc: Ctx.getSourceManager().getExpansionRange(Loc).getEnd());
2317
2318 auto MakeStringLiteral = [&](StringRef Tmp) {
2319 using LValuePathEntry = APValue::LValuePathEntry;
2320 StringLiteral *Res = Ctx.getPredefinedStringLiteralFromCache(Key: Tmp);
2321 // Decay the string to a pointer to the first character.
2322 LValuePathEntry Path[1] = {LValuePathEntry::ArrayIndex(Index: 0)};
2323 return APValue(Res, CharUnits::Zero(), Path, /*OnePastTheEnd=*/false);
2324 };
2325
2326 switch (getIdentKind()) {
2327 case SourceLocIdentKind::FileName: {
2328 // __builtin_FILE_NAME() is a Clang-specific extension that expands to the
2329 // the last part of __builtin_FILE().
2330 SmallString<256> FileName;
2331 clang::Preprocessor::processPathToFileName(
2332 FileName, PLoc, LangOpts: Ctx.getLangOpts(), TI: Ctx.getTargetInfo());
2333 return MakeStringLiteral(FileName);
2334 }
2335 case SourceLocIdentKind::File: {
2336 SmallString<256> Path(PLoc.getFilename());
2337 clang::Preprocessor::processPathForFileMacro(Path, LangOpts: Ctx.getLangOpts(),
2338 TI: Ctx.getTargetInfo());
2339 return MakeStringLiteral(Path);
2340 }
2341 case SourceLocIdentKind::Function:
2342 case SourceLocIdentKind::FuncSig: {
2343 const auto *CurDecl = dyn_cast<Decl>(Val: Context);
2344 const auto Kind = getIdentKind() == SourceLocIdentKind::Function
2345 ? PredefinedIdentKind::Function
2346 : PredefinedIdentKind::FuncSig;
2347 return MakeStringLiteral(
2348 CurDecl ? PredefinedExpr::ComputeName(IK: Kind, CurrentDecl: CurDecl) : std::string(""));
2349 }
2350 case SourceLocIdentKind::Line:
2351 return APValue(Ctx.MakeIntValue(Value: PLoc.getLine(), Type: Ctx.UnsignedIntTy));
2352 case SourceLocIdentKind::Column:
2353 return APValue(Ctx.MakeIntValue(Value: PLoc.getColumn(), Type: Ctx.UnsignedIntTy));
2354 case SourceLocIdentKind::SourceLocStruct: {
2355 // Fill in a std::source_location::__impl structure, by creating an
2356 // artificial file-scoped CompoundLiteralExpr, and returning a pointer to
2357 // that.
2358 const CXXRecordDecl *ImplDecl = getType()->getPointeeCXXRecordDecl();
2359 assert(ImplDecl);
2360
2361 // Construct an APValue for the __impl struct, and get or create a Decl
2362 // corresponding to that. Note that we've already verified that the shape of
2363 // the ImplDecl type is as expected.
2364
2365 APValue Value(APValue::UninitStruct(), 0, 4);
2366 for (const FieldDecl *F : ImplDecl->fields()) {
2367 StringRef Name = F->getName();
2368 if (Name == "_M_file_name") {
2369 SmallString<256> Path(PLoc.getFilename());
2370 clang::Preprocessor::processPathForFileMacro(Path, LangOpts: Ctx.getLangOpts(),
2371 TI: Ctx.getTargetInfo());
2372 Value.getStructField(i: F->getFieldIndex()) = MakeStringLiteral(Path);
2373 } else if (Name == "_M_function_name") {
2374 // Note: this emits the PrettyFunction name -- different than what
2375 // __builtin_FUNCTION() above returns!
2376 const auto *CurDecl = dyn_cast<Decl>(Val: Context);
2377 Value.getStructField(i: F->getFieldIndex()) = MakeStringLiteral(
2378 CurDecl && !isa<TranslationUnitDecl>(Val: CurDecl)
2379 ? StringRef(PredefinedExpr::ComputeName(
2380 IK: PredefinedIdentKind::PrettyFunction, CurrentDecl: CurDecl))
2381 : "");
2382 } else if (Name == "_M_line") {
2383 llvm::APSInt IntVal = Ctx.MakeIntValue(Value: PLoc.getLine(), Type: F->getType());
2384 Value.getStructField(i: F->getFieldIndex()) = APValue(IntVal);
2385 } else if (Name == "_M_column") {
2386 llvm::APSInt IntVal = Ctx.MakeIntValue(Value: PLoc.getColumn(), Type: F->getType());
2387 Value.getStructField(i: F->getFieldIndex()) = APValue(IntVal);
2388 }
2389 }
2390
2391 UnnamedGlobalConstantDecl *GV =
2392 Ctx.getUnnamedGlobalConstantDecl(Ty: getType()->getPointeeType(), Value);
2393
2394 return APValue(GV, CharUnits::Zero(), ArrayRef<APValue::LValuePathEntry>{},
2395 false);
2396 }
2397 }
2398 llvm_unreachable("unhandled case");
2399}
2400
2401EmbedExpr::EmbedExpr(const ASTContext &Ctx, SourceLocation Loc,
2402 EmbedDataStorage *Data, unsigned Begin,
2403 unsigned NumOfElements)
2404 : Expr(EmbedExprClass, Ctx.IntTy, VK_PRValue, OK_Ordinary),
2405 EmbedKeywordLoc(Loc), Ctx(&Ctx), Data(Data), Begin(Begin),
2406 NumOfElements(NumOfElements) {
2407 setDependence(ExprDependence::None);
2408 FakeChildNode = IntegerLiteral::Create(
2409 C: Ctx, V: llvm::APInt::getZero(numBits: Ctx.getTypeSize(T: getType())), type: getType(), l: Loc);
2410 assert(getType()->isSignedIntegerType() && "IntTy should be signed");
2411}
2412
2413InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
2414 ArrayRef<Expr *> initExprs, SourceLocation rbraceloc,
2415 bool isExplicit)
2416 : Expr(InitListExprClass, QualType(), VK_PRValue, OK_Ordinary),
2417 InitExprs(C, initExprs.size()), LBraceLoc(lbraceloc),
2418 RBraceLoc(rbraceloc), AltForm(nullptr, true) {
2419 sawArrayRangeDesignator(ARD: false);
2420 InitExprs.insert(C, I: InitExprs.end(), From: initExprs.begin(), To: initExprs.end());
2421 InitListExprBits.IsExplicit = isExplicit;
2422
2423 setDependence(computeDependence(E: this));
2424}
2425
2426void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
2427 if (NumInits > InitExprs.size())
2428 InitExprs.reserve(C, N: NumInits);
2429}
2430
2431void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
2432 InitExprs.resize(C, N: NumInits, NV: nullptr);
2433}
2434
2435Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
2436 if (Init >= InitExprs.size()) {
2437 InitExprs.insert(C, I: InitExprs.end(), NumToInsert: Init - InitExprs.size() + 1, Elt: nullptr);
2438 setInit(Init, expr);
2439 return nullptr;
2440 }
2441
2442 Expr *Result = cast_or_null<Expr>(Val: InitExprs[Init]);
2443 setInit(Init, expr);
2444 return Result;
2445}
2446
2447void InitListExpr::setArrayFiller(Expr *filler) {
2448 assert(!hasArrayFiller() && "Filler already set!");
2449 ArrayFillerOrUnionFieldInit = filler;
2450 // Fill out any "holes" in the array due to designated initializers.
2451 Expr **inits = getInits();
2452 for (unsigned i = 0, e = getNumInits(); i != e; ++i)
2453 if (inits[i] == nullptr)
2454 inits[i] = filler;
2455}
2456
2457bool InitListExpr::isStringLiteralInit() const {
2458 if (getNumInits() != 1)
2459 return false;
2460 const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
2461 if (!AT || !AT->getElementType()->isIntegerType())
2462 return false;
2463 // It is possible for getInit() to return null.
2464 const Expr *Init = getInit(Init: 0);
2465 if (!Init)
2466 return false;
2467 Init = Init->IgnoreParenImpCasts();
2468 return isa<StringLiteral>(Val: Init) || isa<ObjCEncodeExpr>(Val: Init);
2469}
2470
2471bool InitListExpr::isTransparent() const {
2472 assert(isSemanticForm() && "syntactic form never semantically transparent");
2473
2474 // A glvalue InitListExpr is always just sugar.
2475 if (isGLValue()) {
2476 assert(getNumInits() == 1 && "multiple inits in glvalue init list");
2477 return true;
2478 }
2479
2480 // Otherwise, we're sugar if and only if we have exactly one initializer that
2481 // is of the same type.
2482 if (getNumInits() != 1 || !getInit(Init: 0))
2483 return false;
2484
2485 // Don't confuse aggregate initialization of a struct X { X &x; }; with a
2486 // transparent struct copy.
2487 if (!getInit(Init: 0)->isPRValue() && getType()->isRecordType())
2488 return false;
2489
2490 return getType().getCanonicalType() ==
2491 getInit(Init: 0)->getType().getCanonicalType();
2492}
2493
2494bool InitListExpr::isIdiomaticZeroInitializer(const LangOptions &LangOpts) const {
2495 assert(isSyntacticForm() && "only test syntactic form as zero initializer");
2496
2497 if (LangOpts.CPlusPlus || getNumInits() != 1 || !getInit(Init: 0)) {
2498 return false;
2499 }
2500
2501 const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: getInit(Init: 0)->IgnoreImplicit());
2502 return Lit && Lit->getValue() == 0;
2503}
2504
2505SourceLocation InitListExpr::getBeginLoc() const {
2506 if (InitListExpr *SyntacticForm = getSyntacticForm())
2507 return SyntacticForm->getBeginLoc();
2508 SourceLocation Beg = LBraceLoc;
2509 if (Beg.isInvalid()) {
2510 // Find the first non-null initializer.
2511 for (InitExprsTy::const_iterator I = InitExprs.begin(),
2512 E = InitExprs.end();
2513 I != E; ++I) {
2514 if (Stmt *S = *I) {
2515 Beg = S->getBeginLoc();
2516 break;
2517 }
2518 }
2519 }
2520 return Beg;
2521}
2522
2523SourceLocation InitListExpr::getEndLoc() const {
2524 if (InitListExpr *SyntacticForm = getSyntacticForm())
2525 return SyntacticForm->getEndLoc();
2526 SourceLocation End = RBraceLoc;
2527 if (End.isInvalid()) {
2528 // Find the first non-null initializer from the end.
2529 for (Stmt *S : llvm::reverse(C: InitExprs)) {
2530 if (S) {
2531 End = S->getEndLoc();
2532 break;
2533 }
2534 }
2535 }
2536 return End;
2537}
2538
2539/// getFunctionType - Return the underlying function type for this block.
2540///
2541const FunctionProtoType *BlockExpr::getFunctionType() const {
2542 // The block pointer is never sugared, but the function type might be.
2543 return cast<BlockPointerType>(Val: getType())
2544 ->getPointeeType()->castAs<FunctionProtoType>();
2545}
2546
2547SourceLocation BlockExpr::getCaretLocation() const {
2548 return TheBlock->getCaretLocation();
2549}
2550const Stmt *BlockExpr::getBody() const {
2551 return TheBlock->getBody();
2552}
2553Stmt *BlockExpr::getBody() {
2554 return TheBlock->getBody();
2555}
2556
2557
2558//===----------------------------------------------------------------------===//
2559// Generic Expression Routines
2560//===----------------------------------------------------------------------===//
2561
2562/// Helper to determine wether \c E is a CXXConstructExpr constructing
2563/// a DecompositionDecl. Used to skip Clang-generated calls to std::get
2564/// for structured bindings.
2565static bool IsDecompositionDeclRefExpr(const Expr *E) {
2566 const auto *Unwrapped = E->IgnoreUnlessSpelledInSource();
2567 const auto *Ref = dyn_cast<DeclRefExpr>(Val: Unwrapped);
2568 if (!Ref)
2569 return false;
2570
2571 return isa_and_nonnull<DecompositionDecl>(Val: Ref->getDecl());
2572}
2573
2574bool Expr::isReadIfDiscardedInCPlusPlus11() const {
2575 // In C++11, discarded-value expressions of a certain form are special,
2576 // according to [expr]p10:
2577 // The lvalue-to-rvalue conversion (4.1) is applied only if the
2578 // expression is a glvalue of volatile-qualified type and it has
2579 // one of the following forms:
2580 if (!isGLValue() || !getType().isVolatileQualified())
2581 return false;
2582
2583 const Expr *E = IgnoreParens();
2584
2585 // - id-expression (5.1.1),
2586 if (isa<DeclRefExpr>(Val: E))
2587 return true;
2588
2589 // - subscripting (5.2.1),
2590 if (isa<ArraySubscriptExpr>(Val: E))
2591 return true;
2592
2593 // - class member access (5.2.5),
2594 if (isa<MemberExpr>(Val: E))
2595 return true;
2596
2597 // - indirection (5.3.1),
2598 if (auto *UO = dyn_cast<UnaryOperator>(Val: E))
2599 if (UO->getOpcode() == UO_Deref)
2600 return true;
2601
2602 if (auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
2603 // - pointer-to-member operation (5.5),
2604 if (BO->isPtrMemOp())
2605 return true;
2606
2607 // - comma expression (5.18) where the right operand is one of the above.
2608 if (BO->getOpcode() == BO_Comma)
2609 return BO->getRHS()->isReadIfDiscardedInCPlusPlus11();
2610 }
2611
2612 // - conditional expression (5.16) where both the second and the third
2613 // operands are one of the above, or
2614 if (auto *CO = dyn_cast<ConditionalOperator>(Val: E))
2615 return CO->getTrueExpr()->isReadIfDiscardedInCPlusPlus11() &&
2616 CO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2617 // The related edge case of "*x ?: *x".
2618 if (auto *BCO =
2619 dyn_cast<BinaryConditionalOperator>(Val: E)) {
2620 if (auto *OVE = dyn_cast<OpaqueValueExpr>(Val: BCO->getTrueExpr()))
2621 return OVE->getSourceExpr()->isReadIfDiscardedInCPlusPlus11() &&
2622 BCO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2623 }
2624
2625 // Objective-C++ extensions to the rule.
2626 if (isa<ObjCIvarRefExpr>(Val: E))
2627 return true;
2628 if (const auto *POE = dyn_cast<PseudoObjectExpr>(Val: E)) {
2629 if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(Val: POE->getSyntacticForm()))
2630 return true;
2631 }
2632
2633 return false;
2634}
2635
2636/// isUnusedResultAWarning - Return true if this immediate expression should
2637/// be warned about if the result is unused. If so, fill in Loc and Ranges
2638/// with location to warn on and the source range[s] to report with the
2639/// warning.
2640bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
2641 SourceRange &R1, SourceRange &R2,
2642 ASTContext &Ctx) const {
2643 // Don't warn if the expr is type dependent. The type could end up
2644 // instantiating to void.
2645 if (isTypeDependent())
2646 return false;
2647
2648 switch (getStmtClass()) {
2649 default:
2650 if (getType()->isVoidType())
2651 return false;
2652 WarnE = this;
2653 Loc = getExprLoc();
2654 R1 = getSourceRange();
2655 return true;
2656 case ParenExprClass:
2657 return cast<ParenExpr>(Val: this)->getSubExpr()->
2658 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2659 case GenericSelectionExprClass:
2660 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()->
2661 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2662 case CoawaitExprClass:
2663 case CoyieldExprClass:
2664 return cast<CoroutineSuspendExpr>(Val: this)->getResumeExpr()->
2665 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2666 case ChooseExprClass:
2667 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()->
2668 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2669 case UnaryOperatorClass: {
2670 const UnaryOperator *UO = cast<UnaryOperator>(Val: this);
2671
2672 switch (UO->getOpcode()) {
2673 case UO_Plus:
2674 case UO_Minus:
2675 case UO_AddrOf:
2676 case UO_Not:
2677 case UO_LNot:
2678 case UO_Deref:
2679 break;
2680 case UO_Coawait:
2681 // This is just the 'operator co_await' call inside the guts of a
2682 // dependent co_await call.
2683 case UO_PostInc:
2684 case UO_PostDec:
2685 case UO_PreInc:
2686 case UO_PreDec: // ++/--
2687 return false; // Not a warning.
2688 case UO_Real:
2689 case UO_Imag:
2690 // accessing a piece of a volatile complex is a side-effect.
2691 if (Ctx.getCanonicalType(T: UO->getSubExpr()->getType())
2692 .isVolatileQualified())
2693 return false;
2694 break;
2695 case UO_Extension:
2696 return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2697 }
2698 WarnE = this;
2699 Loc = UO->getOperatorLoc();
2700 R1 = UO->getSubExpr()->getSourceRange();
2701 return true;
2702 }
2703 case BinaryOperatorClass: {
2704 const BinaryOperator *BO = cast<BinaryOperator>(Val: this);
2705 switch (BO->getOpcode()) {
2706 default:
2707 break;
2708 // Consider the RHS of comma for side effects. LHS was checked by
2709 // Sema::CheckCommaOperands.
2710 case BO_Comma:
2711 // ((foo = <blah>), 0) is an idiom for hiding the result (and
2712 // lvalue-ness) of an assignment written in a macro.
2713 if (IntegerLiteral *IE =
2714 dyn_cast<IntegerLiteral>(Val: BO->getRHS()->IgnoreParens()))
2715 if (IE->getValue() == 0)
2716 return false;
2717 return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2718 // Consider '||', '&&' to have side effects if the LHS or RHS does.
2719 case BO_LAnd:
2720 case BO_LOr:
2721 if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
2722 !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2723 return false;
2724 break;
2725 }
2726 if (BO->isAssignmentOp())
2727 return false;
2728 WarnE = this;
2729 Loc = BO->getOperatorLoc();
2730 R1 = BO->getLHS()->getSourceRange();
2731 R2 = BO->getRHS()->getSourceRange();
2732 return true;
2733 }
2734 case CompoundAssignOperatorClass:
2735 case VAArgExprClass:
2736 case AtomicExprClass:
2737 return false;
2738
2739 case ConditionalOperatorClass: {
2740 // If only one of the LHS or RHS is a warning, the operator might
2741 // be being used for control flow. Only warn if both the LHS and
2742 // RHS are warnings.
2743 const auto *Exp = cast<ConditionalOperator>(Val: this);
2744 return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) &&
2745 Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2746 }
2747 case BinaryConditionalOperatorClass: {
2748 const auto *Exp = cast<BinaryConditionalOperator>(Val: this);
2749 return Exp->getFalseExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2750 }
2751
2752 case MemberExprClass:
2753 WarnE = this;
2754 Loc = cast<MemberExpr>(Val: this)->getMemberLoc();
2755 R1 = SourceRange(Loc, Loc);
2756 R2 = cast<MemberExpr>(Val: this)->getBase()->getSourceRange();
2757 return true;
2758
2759 case ArraySubscriptExprClass:
2760 WarnE = this;
2761 Loc = cast<ArraySubscriptExpr>(Val: this)->getRBracketLoc();
2762 R1 = cast<ArraySubscriptExpr>(Val: this)->getLHS()->getSourceRange();
2763 R2 = cast<ArraySubscriptExpr>(Val: this)->getRHS()->getSourceRange();
2764 return true;
2765
2766 case CXXOperatorCallExprClass: {
2767 // Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
2768 // overloads as there is no reasonable way to define these such that they
2769 // have non-trivial, desirable side-effects. See the -Wunused-comparison
2770 // warning: operators == and != are commonly typo'ed, and so warning on them
2771 // provides additional value as well. If this list is updated,
2772 // DiagnoseUnusedComparison should be as well.
2773 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(Val: this);
2774 switch (Op->getOperator()) {
2775 default:
2776 break;
2777 case OO_EqualEqual:
2778 case OO_ExclaimEqual:
2779 case OO_Less:
2780 case OO_Greater:
2781 case OO_GreaterEqual:
2782 case OO_LessEqual:
2783 if (Op->getCallReturnType(Ctx)->isReferenceType() ||
2784 Op->getCallReturnType(Ctx)->isVoidType())
2785 break;
2786 WarnE = this;
2787 Loc = Op->getOperatorLoc();
2788 R1 = Op->getSourceRange();
2789 return true;
2790 }
2791
2792 // Fallthrough for generic call handling.
2793 [[fallthrough]];
2794 }
2795 case CallExprClass:
2796 case CXXMemberCallExprClass:
2797 case UserDefinedLiteralClass: {
2798 // If this is a direct call, get the callee.
2799 const CallExpr *CE = cast<CallExpr>(Val: this);
2800 // If the callee has attribute pure, const, or warn_unused_result, warn
2801 // about it. void foo() { strlen("bar"); } should warn.
2802 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
2803 // updated to match for QoI.
2804 const Decl *FD = CE->getCalleeDecl();
2805 bool PureOrConst =
2806 FD && (FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>());
2807 if (CE->hasUnusedResultAttr(Ctx) || PureOrConst) {
2808 WarnE = this;
2809 Loc = getBeginLoc();
2810 R1 = getSourceRange();
2811
2812 if (unsigned NumArgs = CE->getNumArgs())
2813 R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2814 CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2815 return true;
2816 }
2817 return false;
2818 }
2819
2820 // If we don't know precisely what we're looking at, let's not warn.
2821 case UnresolvedLookupExprClass:
2822 case CXXUnresolvedConstructExprClass:
2823 case RecoveryExprClass:
2824 return false;
2825
2826 case CXXTemporaryObjectExprClass:
2827 case CXXConstructExprClass: {
2828 const auto *CE = cast<CXXConstructExpr>(Val: this);
2829 const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl();
2830
2831 if ((Type && Type->hasAttr<WarnUnusedAttr>()) ||
2832 CE->hasUnusedResultAttr(Ctx)) {
2833 WarnE = this;
2834 Loc = getBeginLoc();
2835 R1 = getSourceRange();
2836
2837 if (unsigned NumArgs = CE->getNumArgs())
2838 R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2839 CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2840 return true;
2841 }
2842 return false;
2843 }
2844
2845 case ObjCMessageExprClass: {
2846 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(Val: this);
2847 if (Ctx.getLangOpts().ObjCAutoRefCount &&
2848 ME->isInstanceMessage() &&
2849 !ME->getType()->isVoidType() &&
2850 ME->getMethodFamily() == OMF_init) {
2851 WarnE = this;
2852 Loc = getExprLoc();
2853 R1 = ME->getSourceRange();
2854 return true;
2855 }
2856
2857 if (ME->hasUnusedResultAttr(Ctx)) {
2858 WarnE = this;
2859 Loc = getExprLoc();
2860 return true;
2861 }
2862
2863 return false;
2864 }
2865
2866 case ObjCPropertyRefExprClass:
2867 case ObjCSubscriptRefExprClass:
2868 WarnE = this;
2869 Loc = getExprLoc();
2870 R1 = getSourceRange();
2871 return true;
2872
2873 case PseudoObjectExprClass: {
2874 const auto *POE = cast<PseudoObjectExpr>(Val: this);
2875
2876 // For some syntactic forms, we should always warn.
2877 if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(
2878 Val: POE->getSyntacticForm())) {
2879 WarnE = this;
2880 Loc = getExprLoc();
2881 R1 = getSourceRange();
2882 return true;
2883 }
2884
2885 // For others, we should never warn.
2886 if (auto *BO = dyn_cast<BinaryOperator>(Val: POE->getSyntacticForm()))
2887 if (BO->isAssignmentOp())
2888 return false;
2889 if (auto *UO = dyn_cast<UnaryOperator>(Val: POE->getSyntacticForm()))
2890 if (UO->isIncrementDecrementOp())
2891 return false;
2892
2893 // Otherwise, warn if the result expression would warn.
2894 const Expr *Result = POE->getResultExpr();
2895 return Result && Result->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2896 }
2897
2898 case StmtExprClass: {
2899 // Statement exprs don't logically have side effects themselves, but are
2900 // sometimes used in macros in ways that give them a type that is unused.
2901 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
2902 // however, if the result of the stmt expr is dead, we don't want to emit a
2903 // warning.
2904 const CompoundStmt *CS = cast<StmtExpr>(Val: this)->getSubStmt();
2905 if (!CS->body_empty()) {
2906 if (const Expr *E = dyn_cast<Expr>(Val: CS->body_back()))
2907 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2908 if (const LabelStmt *Label = dyn_cast<LabelStmt>(Val: CS->body_back()))
2909 if (const Expr *E = dyn_cast<Expr>(Val: Label->getSubStmt()))
2910 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2911 }
2912
2913 if (getType()->isVoidType())
2914 return false;
2915 WarnE = this;
2916 Loc = cast<StmtExpr>(Val: this)->getLParenLoc();
2917 R1 = getSourceRange();
2918 return true;
2919 }
2920 case CXXFunctionalCastExprClass:
2921 case CStyleCastExprClass: {
2922 // Ignore an explicit cast to void, except in C++98 if the operand is a
2923 // volatile glvalue for which we would trigger an implicit read in any
2924 // other language mode. (Such an implicit read always happens as part of
2925 // the lvalue conversion in C, and happens in C++ for expressions of all
2926 // forms where it seems likely the user intended to trigger a volatile
2927 // load.)
2928 const CastExpr *CE = cast<CastExpr>(Val: this);
2929 const Expr *SubE = CE->getSubExpr()->IgnoreParens();
2930 if (CE->getCastKind() == CK_ToVoid) {
2931 if (Ctx.getLangOpts().CPlusPlus && !Ctx.getLangOpts().CPlusPlus11 &&
2932 SubE->isReadIfDiscardedInCPlusPlus11()) {
2933 // Suppress the "unused value" warning for idiomatic usage of
2934 // '(void)var;' used to suppress "unused variable" warnings.
2935 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: SubE))
2936 if (auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
2937 if (!VD->isExternallyVisible())
2938 return false;
2939
2940 // The lvalue-to-rvalue conversion would have no effect for an array.
2941 // It's implausible that the programmer expected this to result in a
2942 // volatile array load, so don't warn.
2943 if (SubE->getType()->isArrayType())
2944 return false;
2945
2946 return SubE->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2947 }
2948 return false;
2949 }
2950
2951 // If this is a cast to a constructor conversion, check the operand.
2952 // Otherwise, the result of the cast is unused.
2953 if (CE->getCastKind() == CK_ConstructorConversion)
2954 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2955 if (CE->getCastKind() == CK_Dependent)
2956 return false;
2957
2958 WarnE = this;
2959 if (const CXXFunctionalCastExpr *CXXCE =
2960 dyn_cast<CXXFunctionalCastExpr>(Val: this)) {
2961 Loc = CXXCE->getBeginLoc();
2962 R1 = CXXCE->getSubExpr()->getSourceRange();
2963 } else {
2964 const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(Val: this);
2965 Loc = CStyleCE->getLParenLoc();
2966 R1 = CStyleCE->getSubExpr()->getSourceRange();
2967 }
2968 return true;
2969 }
2970 case ImplicitCastExprClass: {
2971 const CastExpr *ICE = cast<ImplicitCastExpr>(Val: this);
2972
2973 // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
2974 if (ICE->getCastKind() == CK_LValueToRValue &&
2975 ICE->getSubExpr()->getType().isVolatileQualified())
2976 return false;
2977
2978 return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2979 }
2980 case CXXDefaultArgExprClass:
2981 return (cast<CXXDefaultArgExpr>(Val: this)
2982 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2983 case CXXDefaultInitExprClass:
2984 return (cast<CXXDefaultInitExpr>(Val: this)
2985 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2986
2987 case CXXNewExprClass:
2988 // FIXME: In theory, there might be new expressions that don't have side
2989 // effects (e.g. a placement new with an uninitialized POD).
2990 case CXXDeleteExprClass:
2991 return false;
2992 case MaterializeTemporaryExprClass:
2993 return cast<MaterializeTemporaryExpr>(Val: this)
2994 ->getSubExpr()
2995 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2996 case CXXBindTemporaryExprClass:
2997 return cast<CXXBindTemporaryExpr>(Val: this)->getSubExpr()
2998 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2999 case ExprWithCleanupsClass:
3000 return cast<ExprWithCleanups>(Val: this)->getSubExpr()
3001 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
3002 case OpaqueValueExprClass:
3003 return cast<OpaqueValueExpr>(Val: this)->getSourceExpr()->isUnusedResultAWarning(
3004 WarnE, Loc, R1, R2, Ctx);
3005 }
3006}
3007
3008/// isOBJCGCCandidate - Check if an expression is objc gc'able.
3009/// returns true, if it is; false otherwise.
3010bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
3011 const Expr *E = IgnoreParens();
3012 switch (E->getStmtClass()) {
3013 default:
3014 return false;
3015 case ObjCIvarRefExprClass:
3016 return true;
3017 case Expr::UnaryOperatorClass:
3018 return cast<UnaryOperator>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3019 case ImplicitCastExprClass:
3020 return cast<ImplicitCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3021 case MaterializeTemporaryExprClass:
3022 return cast<MaterializeTemporaryExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(
3023 Ctx);
3024 case CStyleCastExprClass:
3025 return cast<CStyleCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3026 case DeclRefExprClass: {
3027 const Decl *D = cast<DeclRefExpr>(Val: E)->getDecl();
3028
3029 if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
3030 if (VD->hasGlobalStorage())
3031 return true;
3032 QualType T = VD->getType();
3033 // dereferencing to a pointer is always a gc'able candidate,
3034 // unless it is __weak.
3035 return T->isPointerType() &&
3036 (Ctx.getObjCGCAttrKind(Ty: T) != Qualifiers::Weak);
3037 }
3038 return false;
3039 }
3040 case MemberExprClass: {
3041 const MemberExpr *M = cast<MemberExpr>(Val: E);
3042 return M->getBase()->isOBJCGCCandidate(Ctx);
3043 }
3044 case ArraySubscriptExprClass:
3045 return cast<ArraySubscriptExpr>(Val: E)->getBase()->isOBJCGCCandidate(Ctx);
3046 }
3047}
3048
3049bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
3050 if (isTypeDependent())
3051 return false;
3052 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
3053}
3054
3055QualType Expr::findBoundMemberType(const Expr *expr) {
3056 assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
3057
3058 // Bound member expressions are always one of these possibilities:
3059 // x->m x.m x->*y x.*y
3060 // (possibly parenthesized)
3061
3062 expr = expr->IgnoreParens();
3063 if (const MemberExpr *mem = dyn_cast<MemberExpr>(Val: expr)) {
3064 assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
3065 return mem->getMemberDecl()->getType();
3066 }
3067
3068 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(Val: expr)) {
3069 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
3070 ->getPointeeType();
3071 assert(type->isFunctionType());
3072 return type;
3073 }
3074
3075 assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr));
3076 return QualType();
3077}
3078
3079Expr *Expr::IgnoreImpCasts() {
3080 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitCastsSingleStep);
3081}
3082
3083Expr *Expr::IgnoreCasts() {
3084 return IgnoreExprNodes(E: this, Fns&: IgnoreCastsSingleStep);
3085}
3086
3087Expr *Expr::IgnoreImplicit() {
3088 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitSingleStep);
3089}
3090
3091Expr *Expr::IgnoreImplicitAsWritten() {
3092 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitAsWrittenSingleStep);
3093}
3094
3095Expr *Expr::IgnoreParens() {
3096 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep);
3097}
3098
3099Expr *Expr::IgnoreParenImpCasts() {
3100 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3101 Fns&: IgnoreImplicitCastsExtraSingleStep);
3102}
3103
3104Expr *Expr::IgnoreParenCasts() {
3105 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep, Fns&: IgnoreCastsSingleStep);
3106}
3107
3108Expr *Expr::IgnoreConversionOperatorSingleStep() {
3109 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: this)) {
3110 if (isa_and_nonnull<CXXConversionDecl>(Val: MCE->getMethodDecl()))
3111 return MCE->getImplicitObjectArgument();
3112 }
3113 return this;
3114}
3115
3116Expr *Expr::IgnoreParenLValueCasts() {
3117 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3118 Fns&: IgnoreLValueCastsSingleStep);
3119}
3120
3121Expr *Expr::IgnoreParenBaseCasts() {
3122 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3123 Fns&: IgnoreBaseCastsSingleStep);
3124}
3125
3126Expr *Expr::IgnoreParenNoopCasts(const ASTContext &Ctx) {
3127 auto IgnoreNoopCastsSingleStep = [&Ctx](Expr *E) {
3128 if (auto *CE = dyn_cast<CastExpr>(Val: E)) {
3129 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
3130 // ptr<->int casts of the same width. We also ignore all identity casts.
3131 Expr *SubExpr = CE->getSubExpr();
3132 bool IsIdentityCast =
3133 Ctx.hasSameUnqualifiedType(T1: E->getType(), T2: SubExpr->getType());
3134 bool IsSameWidthCast = (E->getType()->isPointerType() ||
3135 E->getType()->isIntegralType(Ctx)) &&
3136 (SubExpr->getType()->isPointerType() ||
3137 SubExpr->getType()->isIntegralType(Ctx)) &&
3138 (Ctx.getTypeSize(T: E->getType()) ==
3139 Ctx.getTypeSize(T: SubExpr->getType()));
3140
3141 if (IsIdentityCast || IsSameWidthCast)
3142 return SubExpr;
3143 } else if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: E))
3144 return NTTP->getReplacement();
3145
3146 return E;
3147 };
3148 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3149 Fns&: IgnoreNoopCastsSingleStep);
3150}
3151
3152Expr *Expr::IgnoreUnlessSpelledInSource() {
3153 auto IgnoreImplicitConstructorSingleStep = [](Expr *E) {
3154 if (auto *Cast = dyn_cast<CXXFunctionalCastExpr>(Val: E)) {
3155 auto *SE = Cast->getSubExpr();
3156 if (SE->getSourceRange() == E->getSourceRange())
3157 return SE;
3158 }
3159
3160 if (auto *C = dyn_cast<CXXConstructExpr>(Val: E)) {
3161 auto NumArgs = C->getNumArgs();
3162 if (NumArgs == 1 ||
3163 (NumArgs > 1 && isa<CXXDefaultArgExpr>(Val: C->getArg(Arg: 1)))) {
3164 Expr *A = C->getArg(Arg: 0);
3165 if (A->getSourceRange() == E->getSourceRange() || C->isElidable())
3166 return A;
3167 }
3168 }
3169 return E;
3170 };
3171 auto IgnoreImplicitMemberCallSingleStep = [](Expr *E) {
3172 if (auto *C = dyn_cast<CXXMemberCallExpr>(Val: E)) {
3173 Expr *ExprNode = C->getImplicitObjectArgument();
3174 if (ExprNode->getSourceRange() == E->getSourceRange()) {
3175 return ExprNode;
3176 }
3177 if (auto *PE = dyn_cast<ParenExpr>(Val: ExprNode)) {
3178 if (PE->getSourceRange() == C->getSourceRange()) {
3179 return cast<Expr>(Val: PE);
3180 }
3181 }
3182 ExprNode = ExprNode->IgnoreParenImpCasts();
3183 if (ExprNode->getSourceRange() == E->getSourceRange())
3184 return ExprNode;
3185 }
3186 return E;
3187 };
3188
3189 // Used when Clang generates calls to std::get for decomposing
3190 // structured bindings.
3191 auto IgnoreImplicitCallSingleStep = [](Expr *E) {
3192 auto *C = dyn_cast<CallExpr>(Val: E);
3193 if (!C)
3194 return E;
3195
3196 // Looking for calls to a std::get, which usually just takes
3197 // 1 argument (i.e., the structure being decomposed). If it has
3198 // more than 1 argument, the others need to be defaulted.
3199 unsigned NumArgs = C->getNumArgs();
3200 if (NumArgs == 0 || (NumArgs > 1 && !isa<CXXDefaultArgExpr>(Val: C->getArg(Arg: 1))))
3201 return E;
3202
3203 Expr *A = C->getArg(Arg: 0);
3204
3205 // This was spelled out in source. Don't ignore.
3206 if (A->getSourceRange() != E->getSourceRange())
3207 return E;
3208
3209 // If the argument refers to a DecompositionDecl construction,
3210 // ignore it.
3211 if (IsDecompositionDeclRefExpr(E: A))
3212 return A;
3213
3214 return E;
3215 };
3216
3217 return IgnoreExprNodes(
3218 E: this, Fns&: IgnoreImplicitSingleStep, Fns&: IgnoreImplicitCastsExtraSingleStep,
3219 Fns&: IgnoreParensOnlySingleStep, Fns&: IgnoreImplicitConstructorSingleStep,
3220 Fns&: IgnoreImplicitMemberCallSingleStep, Fns&: IgnoreImplicitCallSingleStep);
3221}
3222
3223bool Expr::isDefaultArgument() const {
3224 const Expr *E = this;
3225 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3226 E = M->getSubExpr();
3227
3228 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E))
3229 E = ICE->getSubExprAsWritten();
3230
3231 return isa<CXXDefaultArgExpr>(Val: E);
3232}
3233
3234/// Skip over any no-op casts and any temporary-binding
3235/// expressions.
3236static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
3237 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3238 E = M->getSubExpr();
3239
3240 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3241 if (ICE->getCastKind() == CK_NoOp)
3242 E = ICE->getSubExpr();
3243 else
3244 break;
3245 }
3246
3247 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(Val: E))
3248 E = BE->getSubExpr();
3249
3250 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3251 if (ICE->getCastKind() == CK_NoOp)
3252 E = ICE->getSubExpr();
3253 else
3254 break;
3255 }
3256
3257 return E->IgnoreParens();
3258}
3259
3260/// isTemporaryObject - Determines if this expression produces a
3261/// temporary of the given class type.
3262bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
3263 if (!C.hasSameUnqualifiedType(T1: getType(), T2: C.getCanonicalTagType(TD: TempTy)))
3264 return false;
3265
3266 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(E: this);
3267
3268 // Temporaries are by definition pr-values of class type.
3269 if (!E->Classify(Ctx&: C).isPRValue()) {
3270 // In this context, property reference is a message call and is pr-value.
3271 if (!isa<ObjCPropertyRefExpr>(Val: E))
3272 return false;
3273 }
3274
3275 // Black-list a few cases which yield pr-values of class type that don't
3276 // refer to temporaries of that type:
3277
3278 // - implicit derived-to-base conversions
3279 if (const auto *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3280 switch (ICE->getCastKind()) {
3281 case CK_DerivedToBase:
3282 case CK_UncheckedDerivedToBase:
3283 return false;
3284 default:
3285 break;
3286 }
3287 }
3288
3289 // - member expressions (all)
3290 if (isa<MemberExpr>(Val: E))
3291 return false;
3292
3293 if (const auto *BO = dyn_cast<BinaryOperator>(Val: E))
3294 if (BO->isPtrMemOp())
3295 return false;
3296
3297 // - opaque values (all)
3298 if (isa<OpaqueValueExpr>(Val: E))
3299 return false;
3300
3301 return true;
3302}
3303
3304bool Expr::isImplicitCXXThis() const {
3305 const Expr *E = this;
3306
3307 // Strip away parentheses and casts we don't care about.
3308 while (true) {
3309 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(Val: E)) {
3310 E = Paren->getSubExpr();
3311 continue;
3312 }
3313
3314 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3315 if (ICE->getCastKind() == CK_NoOp ||
3316 ICE->getCastKind() == CK_LValueToRValue ||
3317 ICE->getCastKind() == CK_DerivedToBase ||
3318 ICE->getCastKind() == CK_UncheckedDerivedToBase) {
3319 E = ICE->getSubExpr();
3320 continue;
3321 }
3322 }
3323
3324 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(Val: E)) {
3325 if (UnOp->getOpcode() == UO_Extension) {
3326 E = UnOp->getSubExpr();
3327 continue;
3328 }
3329 }
3330
3331 if (const MaterializeTemporaryExpr *M
3332 = dyn_cast<MaterializeTemporaryExpr>(Val: E)) {
3333 E = M->getSubExpr();
3334 continue;
3335 }
3336
3337 break;
3338 }
3339
3340 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(Val: E))
3341 return This->isImplicit();
3342
3343 return false;
3344}
3345
3346/// hasAnyTypeDependentArguments - Determines if any of the expressions
3347/// in Exprs is type-dependent.
3348bool Expr::hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs) {
3349 for (unsigned I = 0; I < Exprs.size(); ++I)
3350 if (Exprs[I]->isTypeDependent())
3351 return true;
3352
3353 return false;
3354}
3355
3356bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
3357 const Expr **Culprit) const {
3358 assert(!isValueDependent() &&
3359 "Expression evaluator can't be called on a dependent expression.");
3360
3361 // This function is attempting whether an expression is an initializer
3362 // which can be evaluated at compile-time. It very closely parallels
3363 // ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
3364 // will lead to unexpected results. Like ConstExprEmitter, it falls back
3365 // to isEvaluatable most of the time.
3366 //
3367 // If we ever capture reference-binding directly in the AST, we can
3368 // kill the second parameter.
3369
3370 if (IsForRef) {
3371 if (auto *EWC = dyn_cast<ExprWithCleanups>(Val: this))
3372 return EWC->getSubExpr()->isConstantInitializer(Ctx, IsForRef: true, Culprit);
3373 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Val: this))
3374 return MTE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3375 EvalResult Result;
3376 if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
3377 return true;
3378 if (Culprit)
3379 *Culprit = this;
3380 return false;
3381 }
3382
3383 switch (getStmtClass()) {
3384 default: break;
3385 case Stmt::ExprWithCleanupsClass:
3386 return cast<ExprWithCleanups>(Val: this)->getSubExpr()->isConstantInitializer(
3387 Ctx, IsForRef, Culprit);
3388 case StringLiteralClass:
3389 case ObjCEncodeExprClass:
3390 return true;
3391 case CXXTemporaryObjectExprClass:
3392 case CXXConstructExprClass: {
3393 const CXXConstructExpr *CE = cast<CXXConstructExpr>(Val: this);
3394
3395 if (CE->getConstructor()->isTrivial() &&
3396 CE->getConstructor()->getParent()->hasTrivialDestructor()) {
3397 // Trivial default constructor
3398 if (!CE->getNumArgs()) return true;
3399
3400 // Trivial copy constructor
3401 assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument");
3402 return CE->getArg(Arg: 0)->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3403 }
3404
3405 break;
3406 }
3407 case ConstantExprClass: {
3408 // FIXME: We should be able to return "true" here, but it can lead to extra
3409 // error messages. E.g. in Sema/array-init.c.
3410 const Expr *Exp = cast<ConstantExpr>(Val: this)->getSubExpr();
3411 return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3412 }
3413 case CompoundLiteralExprClass: {
3414 // This handles gcc's extension that allows global initializers like
3415 // "struct x {int x;} x = (struct x) {};".
3416 // FIXME: This accepts other cases it shouldn't!
3417 const Expr *Exp = cast<CompoundLiteralExpr>(Val: this)->getInitializer();
3418 return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3419 }
3420 case DesignatedInitUpdateExprClass: {
3421 const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(Val: this);
3422 return DIUE->getBase()->isConstantInitializer(Ctx, IsForRef: false, Culprit) &&
3423 DIUE->getUpdater()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3424 }
3425 case InitListExprClass: {
3426 // C++ [dcl.init.aggr]p2:
3427 // The elements of an aggregate are:
3428 // - for an array, the array elements in increasing subscript order, or
3429 // - for a class, the direct base classes in declaration order, followed
3430 // by the direct non-static data members (11.4) that are not members of
3431 // an anonymous union, in declaration order.
3432 const InitListExpr *ILE = cast<InitListExpr>(Val: this);
3433 assert(ILE->isSemanticForm() && "InitListExpr must be in semantic form");
3434
3435 if (ILE->isTransparent())
3436 return ILE->getInit(Init: 0)->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3437
3438 if (ILE->getType()->isArrayType()) {
3439 unsigned numInits = ILE->getNumInits();
3440 for (unsigned i = 0; i < numInits; i++) {
3441 if (!ILE->getInit(Init: i)->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3442 return false;
3443 }
3444 return true;
3445 }
3446
3447 if (ILE->getType()->isRecordType()) {
3448 unsigned ElementNo = 0;
3449 auto *RD = ILE->getType()->castAsRecordDecl();
3450
3451 // In C++17, bases were added to the list of members used by aggregate
3452 // initialization.
3453 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(Val: RD)) {
3454 for (unsigned i = 0, e = CXXRD->getNumBases(); i < e; i++) {
3455 if (ElementNo < ILE->getNumInits()) {
3456 const Expr *Elt = ILE->getInit(Init: ElementNo++);
3457 if (!Elt->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3458 return false;
3459 }
3460 }
3461 }
3462
3463 for (const auto *Field : RD->fields()) {
3464 // If this is a union, skip all the fields that aren't being initialized.
3465 if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
3466 continue;
3467
3468 // Don't emit anonymous bitfields, they just affect layout.
3469 if (Field->isUnnamedBitField())
3470 continue;
3471
3472 if (ElementNo < ILE->getNumInits()) {
3473 const Expr *Elt = ILE->getInit(Init: ElementNo++);
3474 if (Field->isBitField()) {
3475 // Bitfields have to evaluate to an integer.
3476 EvalResult Result;
3477 if (!Elt->EvaluateAsInt(Result, Ctx)) {
3478 if (Culprit)
3479 *Culprit = Elt;
3480 return false;
3481 }
3482 } else {
3483 bool RefType = Field->getType()->isReferenceType();
3484 if (!Elt->isConstantInitializer(Ctx, IsForRef: RefType, Culprit))
3485 return false;
3486 }
3487 }
3488 }
3489 return true;
3490 }
3491
3492 break;
3493 }
3494 case ImplicitValueInitExprClass:
3495 case NoInitExprClass:
3496 return true;
3497 case ParenExprClass:
3498 return cast<ParenExpr>(Val: this)->getSubExpr()
3499 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3500 case GenericSelectionExprClass:
3501 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()
3502 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3503 case ChooseExprClass:
3504 if (cast<ChooseExpr>(Val: this)->isConditionDependent()) {
3505 if (Culprit)
3506 *Culprit = this;
3507 return false;
3508 }
3509 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()
3510 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3511 case UnaryOperatorClass: {
3512 const UnaryOperator* Exp = cast<UnaryOperator>(Val: this);
3513 if (Exp->getOpcode() == UO_Extension)
3514 return Exp->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3515 break;
3516 }
3517 case ObjCBoxedExprClass: {
3518 const ObjCBoxedExpr *BE = cast<ObjCBoxedExpr>(Val: this);
3519 if (Culprit)
3520 *Culprit = this;
3521 return BE->isExpressibleAsConstantInitializer();
3522 }
3523 case ObjCArrayLiteralClass: {
3524 const ObjCArrayLiteral *ALE = cast<ObjCArrayLiteral>(Val: this);
3525 if (Culprit)
3526 *Culprit = this;
3527 return ALE->isExpressibleAsConstantInitializer();
3528 }
3529 case ObjCDictionaryLiteralClass: {
3530 const ObjCDictionaryLiteral *DLE = cast<ObjCDictionaryLiteral>(Val: this);
3531 if (Culprit)
3532 *Culprit = this;
3533 return DLE->isExpressibleAsConstantInitializer();
3534 }
3535 case PackIndexingExprClass: {
3536 return cast<PackIndexingExpr>(Val: this)
3537 ->getSelectedExpr()
3538 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3539 }
3540 case CXXFunctionalCastExprClass:
3541 case CXXStaticCastExprClass:
3542 case ImplicitCastExprClass:
3543 case CStyleCastExprClass:
3544 case ObjCBridgedCastExprClass:
3545 case CXXDynamicCastExprClass:
3546 case CXXReinterpretCastExprClass:
3547 case CXXAddrspaceCastExprClass:
3548 case CXXConstCastExprClass: {
3549 const CastExpr *CE = cast<CastExpr>(Val: this);
3550
3551 // Handle misc casts we want to ignore.
3552 if (CE->getCastKind() == CK_NoOp ||
3553 CE->getCastKind() == CK_LValueToRValue ||
3554 CE->getCastKind() == CK_ToUnion ||
3555 CE->getCastKind() == CK_ConstructorConversion ||
3556 CE->getCastKind() == CK_NonAtomicToAtomic ||
3557 CE->getCastKind() == CK_AtomicToNonAtomic ||
3558 CE->getCastKind() == CK_NullToPointer ||
3559 CE->getCastKind() == CK_IntToOCLSampler)
3560 return CE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3561
3562 break;
3563 }
3564 case MaterializeTemporaryExprClass:
3565 return cast<MaterializeTemporaryExpr>(Val: this)
3566 ->getSubExpr()
3567 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3568
3569 case SubstNonTypeTemplateParmExprClass:
3570 return cast<SubstNonTypeTemplateParmExpr>(Val: this)->getReplacement()
3571 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3572 case CXXDefaultArgExprClass:
3573 return cast<CXXDefaultArgExpr>(Val: this)->getExpr()
3574 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3575 case CXXDefaultInitExprClass:
3576 return cast<CXXDefaultInitExpr>(Val: this)->getExpr()
3577 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3578 }
3579 // Allow certain forms of UB in constant initializers: signed integer
3580 // overflow and floating-point division by zero. We'll give a warning on
3581 // these, but they're common enough that we have to accept them.
3582 if (isEvaluatable(Ctx, AllowSideEffects: SE_AllowUndefinedBehavior))
3583 return true;
3584 if (Culprit)
3585 *Culprit = this;
3586 return false;
3587}
3588
3589bool CallExpr::isBuiltinAssumeFalse(const ASTContext &Ctx) const {
3590 unsigned BuiltinID = getBuiltinCallee();
3591 if (BuiltinID != Builtin::BI__assume &&
3592 BuiltinID != Builtin::BI__builtin_assume)
3593 return false;
3594
3595 const Expr* Arg = getArg(Arg: 0);
3596 bool ArgVal;
3597 return !Arg->isValueDependent() &&
3598 Arg->EvaluateAsBooleanCondition(Result&: ArgVal, Ctx) && !ArgVal;
3599}
3600
3601const AllocSizeAttr *CallExpr::getCalleeAllocSizeAttr() const {
3602 if (const FunctionDecl *DirectCallee = getDirectCallee())
3603 return DirectCallee->getAttr<AllocSizeAttr>();
3604 if (const Decl *IndirectCallee = getCalleeDecl())
3605 return IndirectCallee->getAttr<AllocSizeAttr>();
3606 return nullptr;
3607}
3608
3609std::optional<llvm::APInt>
3610CallExpr::evaluateBytesReturnedByAllocSizeCall(const ASTContext &Ctx) const {
3611 const AllocSizeAttr *AllocSize = getCalleeAllocSizeAttr();
3612
3613 assert(AllocSize && AllocSize->getElemSizeParam().isValid());
3614 unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex();
3615 unsigned BitsInSizeT = Ctx.getTypeSize(T: Ctx.getSizeType());
3616 if (getNumArgs() <= SizeArgNo)
3617 return std::nullopt;
3618
3619 auto EvaluateAsSizeT = [&](const Expr *E, llvm::APSInt &Into) {
3620 Expr::EvalResult ExprResult;
3621 if (E->isValueDependent() ||
3622 !E->EvaluateAsInt(Result&: ExprResult, Ctx, AllowSideEffects: Expr::SE_AllowSideEffects))
3623 return false;
3624 Into = ExprResult.Val.getInt();
3625 if (Into.isNegative() || !Into.isIntN(N: BitsInSizeT))
3626 return false;
3627 Into = Into.extOrTrunc(width: BitsInSizeT);
3628 return true;
3629 };
3630
3631 llvm::APSInt SizeOfElem;
3632 if (!EvaluateAsSizeT(getArg(Arg: SizeArgNo), SizeOfElem))
3633 return std::nullopt;
3634
3635 if (!AllocSize->getNumElemsParam().isValid())
3636 return SizeOfElem;
3637
3638 llvm::APSInt NumberOfElems;
3639 unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex();
3640 if (!EvaluateAsSizeT(getArg(Arg: NumArgNo), NumberOfElems))
3641 return std::nullopt;
3642
3643 bool Overflow;
3644 llvm::APInt BytesAvailable = SizeOfElem.umul_ov(RHS: NumberOfElems, Overflow);
3645 if (Overflow)
3646 return std::nullopt;
3647
3648 return BytesAvailable;
3649}
3650
3651bool CallExpr::isCallToStdMove() const {
3652 return getBuiltinCallee() == Builtin::BImove;
3653}
3654
3655namespace {
3656 /// Look for any side effects within a Stmt.
3657 class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
3658 typedef ConstEvaluatedExprVisitor<SideEffectFinder> Inherited;
3659 const bool IncludePossibleEffects;
3660 bool HasSideEffects;
3661
3662 public:
3663 explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
3664 : Inherited(Context),
3665 IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }
3666
3667 bool hasSideEffects() const { return HasSideEffects; }
3668
3669 void VisitDecl(const Decl *D) {
3670 if (!D)
3671 return;
3672
3673 // We assume the caller checks subexpressions (eg, the initializer, VLA
3674 // bounds) for side-effects on our behalf.
3675 if (auto *VD = dyn_cast<VarDecl>(Val: D)) {
3676 // Registering a destructor is a side-effect.
3677 if (IncludePossibleEffects && VD->isThisDeclarationADefinition() &&
3678 VD->needsDestruction(Ctx: Context))
3679 HasSideEffects = true;
3680 }
3681 }
3682
3683 void VisitDeclStmt(const DeclStmt *DS) {
3684 for (auto *D : DS->decls())
3685 VisitDecl(D);
3686 Inherited::VisitDeclStmt(S: DS);
3687 }
3688
3689 void VisitExpr(const Expr *E) {
3690 if (!HasSideEffects &&
3691 E->HasSideEffects(Ctx: Context, IncludePossibleEffects))
3692 HasSideEffects = true;
3693 }
3694 };
3695}
3696
3697bool Expr::HasSideEffects(const ASTContext &Ctx,
3698 bool IncludePossibleEffects) const {
3699 // In circumstances where we care about definite side effects instead of
3700 // potential side effects, we want to ignore expressions that are part of a
3701 // macro expansion as a potential side effect.
3702 if (!IncludePossibleEffects && getExprLoc().isMacroID())
3703 return false;
3704
3705 switch (getStmtClass()) {
3706 case NoStmtClass:
3707#define ABSTRACT_STMT(Type)
3708#define STMT(Type, Base) case Type##Class:
3709#define EXPR(Type, Base)
3710#include "clang/AST/StmtNodes.inc"
3711 llvm_unreachable("unexpected Expr kind");
3712
3713 case DependentScopeDeclRefExprClass:
3714 case CXXUnresolvedConstructExprClass:
3715 case CXXDependentScopeMemberExprClass:
3716 case UnresolvedLookupExprClass:
3717 case UnresolvedMemberExprClass:
3718 case PackExpansionExprClass:
3719 case SubstNonTypeTemplateParmPackExprClass:
3720 case FunctionParmPackExprClass:
3721 case RecoveryExprClass:
3722 case CXXFoldExprClass:
3723 // Make a conservative assumption for dependent nodes.
3724 return IncludePossibleEffects;
3725
3726 case DeclRefExprClass:
3727 case ObjCIvarRefExprClass:
3728 case PredefinedExprClass:
3729 case IntegerLiteralClass:
3730 case FixedPointLiteralClass:
3731 case FloatingLiteralClass:
3732 case ImaginaryLiteralClass:
3733 case StringLiteralClass:
3734 case CharacterLiteralClass:
3735 case OffsetOfExprClass:
3736 case ImplicitValueInitExprClass:
3737 case UnaryExprOrTypeTraitExprClass:
3738 case AddrLabelExprClass:
3739 case GNUNullExprClass:
3740 case ArrayInitIndexExprClass:
3741 case NoInitExprClass:
3742 case CXXBoolLiteralExprClass:
3743 case CXXNullPtrLiteralExprClass:
3744 case CXXThisExprClass:
3745 case CXXScalarValueInitExprClass:
3746 case TypeTraitExprClass:
3747 case ArrayTypeTraitExprClass:
3748 case ExpressionTraitExprClass:
3749 case CXXNoexceptExprClass:
3750 case SizeOfPackExprClass:
3751 case ObjCStringLiteralClass:
3752 case ObjCEncodeExprClass:
3753 case ObjCBoolLiteralExprClass:
3754 case ObjCAvailabilityCheckExprClass:
3755 case CXXUuidofExprClass:
3756 case OpaqueValueExprClass:
3757 case SourceLocExprClass:
3758 case EmbedExprClass:
3759 case ConceptSpecializationExprClass:
3760 case RequiresExprClass:
3761 case SYCLUniqueStableNameExprClass:
3762 case PackIndexingExprClass:
3763 case HLSLOutArgExprClass:
3764 case OpenACCAsteriskSizeExprClass:
3765 case CXXReflectExprClass:
3766 // These never have a side-effect.
3767 return false;
3768
3769 case ConstantExprClass:
3770 // FIXME: Move this into the "return false;" block above.
3771 return cast<ConstantExpr>(Val: this)->getSubExpr()->HasSideEffects(
3772 Ctx, IncludePossibleEffects);
3773
3774 case CallExprClass:
3775 case CXXOperatorCallExprClass:
3776 case CXXMemberCallExprClass:
3777 case CUDAKernelCallExprClass:
3778 case UserDefinedLiteralClass: {
3779 // We don't know a call definitely has side effects, except for calls
3780 // to pure/const functions that definitely don't.
3781 // If the call itself is considered side-effect free, check the operands.
3782 const Decl *FD = cast<CallExpr>(Val: this)->getCalleeDecl();
3783 bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
3784 if (IsPure || !IncludePossibleEffects)
3785 break;
3786 return true;
3787 }
3788
3789 case BlockExprClass:
3790 case CXXBindTemporaryExprClass:
3791 if (!IncludePossibleEffects)
3792 break;
3793 return true;
3794
3795 case MSPropertyRefExprClass:
3796 case MSPropertySubscriptExprClass:
3797 case CompoundAssignOperatorClass:
3798 case VAArgExprClass:
3799 case AtomicExprClass:
3800 case CXXThrowExprClass:
3801 case CXXNewExprClass:
3802 case CXXDeleteExprClass:
3803 case CoawaitExprClass:
3804 case DependentCoawaitExprClass:
3805 case CoyieldExprClass:
3806 // These always have a side-effect.
3807 return true;
3808
3809 case StmtExprClass: {
3810 // StmtExprs have a side-effect if any substatement does.
3811 SideEffectFinder Finder(Ctx, IncludePossibleEffects);
3812 Finder.Visit(S: cast<StmtExpr>(Val: this)->getSubStmt());
3813 return Finder.hasSideEffects();
3814 }
3815
3816 case ExprWithCleanupsClass:
3817 if (IncludePossibleEffects)
3818 if (cast<ExprWithCleanups>(Val: this)->cleanupsHaveSideEffects())
3819 return true;
3820 break;
3821
3822 case ParenExprClass:
3823 case ArraySubscriptExprClass:
3824 case MatrixSingleSubscriptExprClass:
3825 case MatrixSubscriptExprClass:
3826 case ArraySectionExprClass:
3827 case OMPArrayShapingExprClass:
3828 case OMPIteratorExprClass:
3829 case MemberExprClass:
3830 case ConditionalOperatorClass:
3831 case BinaryConditionalOperatorClass:
3832 case CompoundLiteralExprClass:
3833 case ExtVectorElementExprClass:
3834 case MatrixElementExprClass:
3835 case DesignatedInitExprClass:
3836 case DesignatedInitUpdateExprClass:
3837 case ArrayInitLoopExprClass:
3838 case ParenListExprClass:
3839 case CXXPseudoDestructorExprClass:
3840 case CXXRewrittenBinaryOperatorClass:
3841 case CXXStdInitializerListExprClass:
3842 case SubstNonTypeTemplateParmExprClass:
3843 case MaterializeTemporaryExprClass:
3844 case ShuffleVectorExprClass:
3845 case ConvertVectorExprClass:
3846 case AsTypeExprClass:
3847 case CXXParenListInitExprClass:
3848 // These have a side-effect if any subexpression does.
3849 break;
3850
3851 case UnaryOperatorClass:
3852 if (cast<UnaryOperator>(Val: this)->isIncrementDecrementOp())
3853 return true;
3854 break;
3855
3856 case BinaryOperatorClass:
3857 if (cast<BinaryOperator>(Val: this)->isAssignmentOp())
3858 return true;
3859 break;
3860
3861 case InitListExprClass:
3862 // FIXME: The children for an InitListExpr doesn't include the array filler.
3863 if (const Expr *E = cast<InitListExpr>(Val: this)->getArrayFiller())
3864 if (E->HasSideEffects(Ctx, IncludePossibleEffects))
3865 return true;
3866 break;
3867
3868 case GenericSelectionExprClass:
3869 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()->HasSideEffects(
3870 Ctx, IncludePossibleEffects);
3871
3872 case ChooseExprClass:
3873 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()->HasSideEffects(
3874 Ctx, IncludePossibleEffects);
3875
3876 case CXXDefaultArgExprClass:
3877 return cast<CXXDefaultArgExpr>(Val: this)->getExpr()->HasSideEffects(
3878 Ctx, IncludePossibleEffects);
3879
3880 case CXXDefaultInitExprClass: {
3881 const FieldDecl *FD = cast<CXXDefaultInitExpr>(Val: this)->getField();
3882 if (const Expr *E = FD->getInClassInitializer())
3883 return E->HasSideEffects(Ctx, IncludePossibleEffects);
3884 // If we've not yet parsed the initializer, assume it has side-effects.
3885 return true;
3886 }
3887
3888 case CXXDynamicCastExprClass: {
3889 // A dynamic_cast expression has side-effects if it can throw.
3890 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(Val: this);
3891 if (DCE->getTypeAsWritten()->isReferenceType() &&
3892 DCE->getCastKind() == CK_Dynamic)
3893 return true;
3894 }
3895 [[fallthrough]];
3896 case ImplicitCastExprClass:
3897 case CStyleCastExprClass:
3898 case CXXStaticCastExprClass:
3899 case CXXReinterpretCastExprClass:
3900 case CXXConstCastExprClass:
3901 case CXXAddrspaceCastExprClass:
3902 case CXXFunctionalCastExprClass:
3903 case BuiltinBitCastExprClass: {
3904 // While volatile reads are side-effecting in both C and C++, we treat them
3905 // as having possible (not definite) side-effects. This allows idiomatic
3906 // code to behave without warning, such as sizeof(*v) for a volatile-
3907 // qualified pointer.
3908 if (!IncludePossibleEffects)
3909 break;
3910
3911 const CastExpr *CE = cast<CastExpr>(Val: this);
3912 if (CE->getCastKind() == CK_LValueToRValue &&
3913 CE->getSubExpr()->getType().isVolatileQualified())
3914 return true;
3915 break;
3916 }
3917
3918 case CXXTypeidExprClass: {
3919 const auto *TE = cast<CXXTypeidExpr>(Val: this);
3920 if (!TE->isPotentiallyEvaluated())
3921 return false;
3922
3923 // If this type id expression can throw because of a null pointer, that is a
3924 // side-effect independent of if the operand has a side-effect
3925 if (IncludePossibleEffects && TE->hasNullCheck())
3926 return true;
3927
3928 break;
3929 }
3930
3931 case CXXConstructExprClass:
3932 case CXXTemporaryObjectExprClass: {
3933 const CXXConstructExpr *CE = cast<CXXConstructExpr>(Val: this);
3934 if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
3935 return true;
3936 // A trivial constructor does not add any side-effects of its own. Just look
3937 // at its arguments.
3938 break;
3939 }
3940
3941 case CXXInheritedCtorInitExprClass: {
3942 const auto *ICIE = cast<CXXInheritedCtorInitExpr>(Val: this);
3943 if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
3944 return true;
3945 break;
3946 }
3947
3948 case LambdaExprClass: {
3949 const LambdaExpr *LE = cast<LambdaExpr>(Val: this);
3950 for (Expr *E : LE->capture_inits())
3951 if (E && E->HasSideEffects(Ctx, IncludePossibleEffects))
3952 return true;
3953 return false;
3954 }
3955
3956 case PseudoObjectExprClass: {
3957 // Only look for side-effects in the semantic form, and look past
3958 // OpaqueValueExpr bindings in that form.
3959 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(Val: this);
3960 for (PseudoObjectExpr::const_semantics_iterator I = PO->semantics_begin(),
3961 E = PO->semantics_end();
3962 I != E; ++I) {
3963 const Expr *Subexpr = *I;
3964 if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Val: Subexpr))
3965 Subexpr = OVE->getSourceExpr();
3966 if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
3967 return true;
3968 }
3969 return false;
3970 }
3971
3972 case ObjCBoxedExprClass:
3973 case ObjCArrayLiteralClass:
3974 case ObjCDictionaryLiteralClass:
3975 case ObjCSelectorExprClass:
3976 case ObjCProtocolExprClass:
3977 case ObjCIsaExprClass:
3978 case ObjCIndirectCopyRestoreExprClass:
3979 case ObjCSubscriptRefExprClass:
3980 case ObjCBridgedCastExprClass:
3981 case ObjCMessageExprClass:
3982 case ObjCPropertyRefExprClass:
3983 // FIXME: Classify these cases better.
3984 if (IncludePossibleEffects)
3985 return true;
3986 break;
3987 }
3988
3989 // Recurse to children.
3990 for (const Stmt *SubStmt : children())
3991 if (SubStmt &&
3992 cast<Expr>(Val: SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
3993 return true;
3994
3995 return false;
3996}
3997
3998FPOptions Expr::getFPFeaturesInEffect(const LangOptions &LO) const {
3999 if (auto Call = dyn_cast<CallExpr>(Val: this))
4000 return Call->getFPFeaturesInEffect(LO);
4001 if (auto UO = dyn_cast<UnaryOperator>(Val: this))
4002 return UO->getFPFeaturesInEffect(LO);
4003 if (auto BO = dyn_cast<BinaryOperator>(Val: this))
4004 return BO->getFPFeaturesInEffect(LO);
4005 if (auto Cast = dyn_cast<CastExpr>(Val: this))
4006 return Cast->getFPFeaturesInEffect(LO);
4007 if (auto ConvertVector = dyn_cast<ConvertVectorExpr>(Val: this))
4008 return ConvertVector->getFPFeaturesInEffect(LO);
4009 return FPOptions::defaultWithoutTrailingStorage(LO);
4010}
4011
4012namespace {
4013 /// Look for a call to a non-trivial function within an expression.
4014 class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
4015 {
4016 typedef ConstEvaluatedExprVisitor<NonTrivialCallFinder> Inherited;
4017
4018 bool NonTrivial;
4019
4020 public:
4021 explicit NonTrivialCallFinder(const ASTContext &Context)
4022 : Inherited(Context), NonTrivial(false) { }
4023
4024 bool hasNonTrivialCall() const { return NonTrivial; }
4025
4026 void VisitCallExpr(const CallExpr *E) {
4027 if (const CXXMethodDecl *Method
4028 = dyn_cast_or_null<const CXXMethodDecl>(Val: E->getCalleeDecl())) {
4029 if (Method->isTrivial()) {
4030 // Recurse to children of the call.
4031 Inherited::VisitStmt(S: E);
4032 return;
4033 }
4034 }
4035
4036 NonTrivial = true;
4037 }
4038
4039 void VisitCXXConstructExpr(const CXXConstructExpr *E) {
4040 if (E->getConstructor()->isTrivial()) {
4041 // Recurse to children of the call.
4042 Inherited::VisitStmt(S: E);
4043 return;
4044 }
4045
4046 NonTrivial = true;
4047 }
4048
4049 void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
4050 // Destructor of the temporary might be null if destructor declaration
4051 // is not valid.
4052 if (const CXXDestructorDecl *DtorDecl =
4053 E->getTemporary()->getDestructor()) {
4054 if (DtorDecl->isTrivial()) {
4055 Inherited::VisitStmt(S: E);
4056 return;
4057 }
4058 }
4059
4060 NonTrivial = true;
4061 }
4062 };
4063}
4064
4065bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
4066 NonTrivialCallFinder Finder(Ctx);
4067 Finder.Visit(S: this);
4068 return Finder.hasNonTrivialCall();
4069}
4070
4071/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
4072/// pointer constant or not, as well as the specific kind of constant detected.
4073/// Null pointer constants can be integer constant expressions with the
4074/// value zero, casts of zero to void*, nullptr (C++0X), or __null
4075/// (a GNU extension).
4076Expr::NullPointerConstantKind
4077Expr::isNullPointerConstant(ASTContext &Ctx,
4078 NullPointerConstantValueDependence NPC) const {
4079 if (isValueDependent() &&
4080 (!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
4081 // Error-dependent expr should never be a null pointer.
4082 if (containsErrors())
4083 return NPCK_NotNull;
4084 switch (NPC) {
4085 case NPC_NeverValueDependent:
4086 llvm_unreachable("Unexpected value dependent expression!");
4087 case NPC_ValueDependentIsNull:
4088 if (isTypeDependent() || getType()->isIntegralType(Ctx))
4089 return NPCK_ZeroExpression;
4090 else
4091 return NPCK_NotNull;
4092
4093 case NPC_ValueDependentIsNotNull:
4094 return NPCK_NotNull;
4095 }
4096 }
4097
4098 // Strip off a cast to void*, if it exists. Except in C++.
4099 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(Val: this)) {
4100 if (!Ctx.getLangOpts().CPlusPlus) {
4101 // Check that it is a cast to void*.
4102 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
4103 QualType Pointee = PT->getPointeeType();
4104 Qualifiers Qs = Pointee.getQualifiers();
4105 // Only (void*)0 or equivalent are treated as nullptr. If pointee type
4106 // has non-default address space it is not treated as nullptr.
4107 // (__generic void*)0 in OpenCL 2.0 should not be treated as nullptr
4108 // since it cannot be assigned to a pointer to constant address space.
4109 if (Ctx.getLangOpts().OpenCL &&
4110 Pointee.getAddressSpace() == Ctx.getDefaultOpenCLPointeeAddrSpace())
4111 Qs.removeAddressSpace();
4112
4113 if (Pointee->isVoidType() && Qs.empty() && // to void*
4114 CE->getSubExpr()->getType()->isIntegerType()) // from int
4115 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4116 }
4117 }
4118 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: this)) {
4119 // Ignore the ImplicitCastExpr type entirely.
4120 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4121 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(Val: this)) {
4122 // Accept ((void*)0) as a null pointer constant, as many other
4123 // implementations do.
4124 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4125 } else if (const GenericSelectionExpr *GE =
4126 dyn_cast<GenericSelectionExpr>(Val: this)) {
4127 if (GE->isResultDependent())
4128 return NPCK_NotNull;
4129 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
4130 } else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(Val: this)) {
4131 if (CE->isConditionDependent())
4132 return NPCK_NotNull;
4133 return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
4134 } else if (const CXXDefaultArgExpr *DefaultArg
4135 = dyn_cast<CXXDefaultArgExpr>(Val: this)) {
4136 // See through default argument expressions.
4137 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
4138 } else if (const CXXDefaultInitExpr *DefaultInit
4139 = dyn_cast<CXXDefaultInitExpr>(Val: this)) {
4140 // See through default initializer expressions.
4141 return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
4142 } else if (isa<GNUNullExpr>(Val: this)) {
4143 // The GNU __null extension is always a null pointer constant.
4144 return NPCK_GNUNull;
4145 } else if (const MaterializeTemporaryExpr *M
4146 = dyn_cast<MaterializeTemporaryExpr>(Val: this)) {
4147 return M->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4148 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Val: this)) {
4149 if (const Expr *Source = OVE->getSourceExpr())
4150 return Source->isNullPointerConstant(Ctx, NPC);
4151 }
4152
4153 // If the expression has no type information, it cannot be a null pointer
4154 // constant.
4155 if (getType().isNull())
4156 return NPCK_NotNull;
4157
4158 // C++11/C23 nullptr_t is always a null pointer constant.
4159 if (getType()->isNullPtrType())
4160 return NPCK_CXX11_nullptr;
4161
4162 if (const RecordType *UT = getType()->getAsUnionType())
4163 if (!Ctx.getLangOpts().CPlusPlus11 && UT &&
4164 UT->getDecl()->getMostRecentDecl()->hasAttr<TransparentUnionAttr>())
4165 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Val: this)){
4166 const Expr *InitExpr = CLE->getInitializer();
4167 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(Val: InitExpr))
4168 return ILE->getInit(Init: 0)->isNullPointerConstant(Ctx, NPC);
4169 }
4170 // This expression must be an integer type.
4171 if (!getType()->isIntegerType() ||
4172 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
4173 return NPCK_NotNull;
4174
4175 if (Ctx.getLangOpts().CPlusPlus11) {
4176 // C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
4177 // value zero or a prvalue of type std::nullptr_t.
4178 // Microsoft mode permits C++98 rules reflecting MSVC behavior.
4179 const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: this);
4180 if (Lit && !Lit->getValue())
4181 return NPCK_ZeroLiteral;
4182 if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
4183 return NPCK_NotNull;
4184 } else {
4185 // If we have an integer constant expression, we need to *evaluate* it and
4186 // test for the value 0.
4187 if (!isIntegerConstantExpr(Ctx))
4188 return NPCK_NotNull;
4189 }
4190
4191 if (EvaluateKnownConstInt(Ctx) != 0)
4192 return NPCK_NotNull;
4193
4194 if (isa<IntegerLiteral>(Val: this))
4195 return NPCK_ZeroLiteral;
4196 return NPCK_ZeroExpression;
4197}
4198
4199/// If this expression is an l-value for an Objective C
4200/// property, find the underlying property reference expression.
4201const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
4202 const Expr *E = this;
4203 while (true) {
4204 assert((E->isLValue() && E->getObjectKind() == OK_ObjCProperty) &&
4205 "expression is not a property reference");
4206 E = E->IgnoreParenCasts();
4207 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: E)) {
4208 if (BO->getOpcode() == BO_Comma) {
4209 E = BO->getRHS();
4210 continue;
4211 }
4212 }
4213
4214 break;
4215 }
4216
4217 return cast<ObjCPropertyRefExpr>(Val: E);
4218}
4219
4220bool Expr::isObjCSelfExpr() const {
4221 const Expr *E = IgnoreParenImpCasts();
4222
4223 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E);
4224 if (!DRE)
4225 return false;
4226
4227 const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(Val: DRE->getDecl());
4228 if (!Param)
4229 return false;
4230
4231 const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Val: Param->getDeclContext());
4232 if (!M)
4233 return false;
4234
4235 return M->getSelfDecl() == Param;
4236}
4237
4238FieldDecl *Expr::getSourceBitField() {
4239 Expr *E = this->IgnoreParens();
4240
4241 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4242 if (ICE->getCastKind() == CK_LValueToRValue ||
4243 (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp))
4244 E = ICE->getSubExpr()->IgnoreParens();
4245 else
4246 break;
4247 }
4248
4249 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(Val: E))
4250 if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: MemRef->getMemberDecl()))
4251 if (Field->isBitField())
4252 return Field;
4253
4254 if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(Val: E)) {
4255 FieldDecl *Ivar = IvarRef->getDecl();
4256 if (Ivar->isBitField())
4257 return Ivar;
4258 }
4259
4260 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(Val: E)) {
4261 if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: DeclRef->getDecl()))
4262 if (Field->isBitField())
4263 return Field;
4264
4265 if (BindingDecl *BD = dyn_cast<BindingDecl>(Val: DeclRef->getDecl()))
4266 if (Expr *E = BD->getBinding())
4267 return E->getSourceBitField();
4268 }
4269
4270 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Val: E)) {
4271 if (BinOp->isAssignmentOp() && BinOp->getLHS())
4272 return BinOp->getLHS()->getSourceBitField();
4273
4274 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
4275 return BinOp->getRHS()->getSourceBitField();
4276 }
4277
4278 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Val: E))
4279 if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
4280 return UnOp->getSubExpr()->getSourceBitField();
4281
4282 return nullptr;
4283}
4284
4285EnumConstantDecl *Expr::getEnumConstantDecl() {
4286 Expr *E = this->IgnoreParenImpCasts();
4287 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4288 return dyn_cast<EnumConstantDecl>(Val: DRE->getDecl());
4289 return nullptr;
4290}
4291
4292bool Expr::refersToVectorElement() const {
4293 // FIXME: Why do we not just look at the ObjectKind here?
4294 const Expr *E = this->IgnoreParens();
4295
4296 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4297 if (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp)
4298 E = ICE->getSubExpr()->IgnoreParens();
4299 else
4300 break;
4301 }
4302
4303 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(Val: E))
4304 return ASE->getBase()->getType()->isVectorType();
4305
4306 if (isa<ExtVectorElementExpr>(Val: E))
4307 return true;
4308
4309 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4310 if (auto *BD = dyn_cast<BindingDecl>(Val: DRE->getDecl()))
4311 if (auto *E = BD->getBinding())
4312 return E->refersToVectorElement();
4313
4314 return false;
4315}
4316
4317bool Expr::refersToGlobalRegisterVar() const {
4318 const Expr *E = this->IgnoreParenImpCasts();
4319
4320 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E))
4321 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
4322 if (VD->getStorageClass() == SC_Register &&
4323 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
4324 return true;
4325
4326 return false;
4327}
4328
4329bool Expr::isSameComparisonOperand(const Expr* E1, const Expr* E2) {
4330 E1 = E1->IgnoreParens();
4331 E2 = E2->IgnoreParens();
4332
4333 if (E1->getStmtClass() != E2->getStmtClass())
4334 return false;
4335
4336 switch (E1->getStmtClass()) {
4337 default:
4338 return false;
4339 case CXXThisExprClass:
4340 return true;
4341 case DeclRefExprClass: {
4342 // DeclRefExpr without an ImplicitCastExpr can happen for integral
4343 // template parameters.
4344 const auto *DRE1 = cast<DeclRefExpr>(Val: E1);
4345 const auto *DRE2 = cast<DeclRefExpr>(Val: E2);
4346
4347 if (DRE1->getDecl() != DRE2->getDecl())
4348 return false;
4349
4350 if ((DRE1->isPRValue() && DRE2->isPRValue()) ||
4351 (DRE1->isLValue() && DRE2->isLValue()))
4352 return true;
4353
4354 return false;
4355 }
4356 case ImplicitCastExprClass: {
4357 // Peel off implicit casts.
4358 while (true) {
4359 const auto *ICE1 = dyn_cast<ImplicitCastExpr>(Val: E1);
4360 const auto *ICE2 = dyn_cast<ImplicitCastExpr>(Val: E2);
4361 if (!ICE1 || !ICE2)
4362 return false;
4363 if (ICE1->getCastKind() != ICE2->getCastKind())
4364 return isSameComparisonOperand(E1: ICE1->IgnoreParenImpCasts(),
4365 E2: ICE2->IgnoreParenImpCasts());
4366 E1 = ICE1->getSubExpr()->IgnoreParens();
4367 E2 = ICE2->getSubExpr()->IgnoreParens();
4368 // The final cast must be one of these types.
4369 if (ICE1->getCastKind() == CK_LValueToRValue ||
4370 ICE1->getCastKind() == CK_ArrayToPointerDecay ||
4371 ICE1->getCastKind() == CK_FunctionToPointerDecay) {
4372 break;
4373 }
4374 }
4375
4376 const auto *DRE1 = dyn_cast<DeclRefExpr>(Val: E1);
4377 const auto *DRE2 = dyn_cast<DeclRefExpr>(Val: E2);
4378 if (DRE1 && DRE2)
4379 return declaresSameEntity(D1: DRE1->getDecl(), D2: DRE2->getDecl());
4380
4381 const auto *Ivar1 = dyn_cast<ObjCIvarRefExpr>(Val: E1);
4382 const auto *Ivar2 = dyn_cast<ObjCIvarRefExpr>(Val: E2);
4383 if (Ivar1 && Ivar2) {
4384 return Ivar1->isFreeIvar() && Ivar2->isFreeIvar() &&
4385 declaresSameEntity(D1: Ivar1->getDecl(), D2: Ivar2->getDecl());
4386 }
4387
4388 const auto *Array1 = dyn_cast<ArraySubscriptExpr>(Val: E1);
4389 const auto *Array2 = dyn_cast<ArraySubscriptExpr>(Val: E2);
4390 if (Array1 && Array2) {
4391 if (!isSameComparisonOperand(E1: Array1->getBase(), E2: Array2->getBase()))
4392 return false;
4393
4394 auto Idx1 = Array1->getIdx();
4395 auto Idx2 = Array2->getIdx();
4396 const auto Integer1 = dyn_cast<IntegerLiteral>(Val: Idx1);
4397 const auto Integer2 = dyn_cast<IntegerLiteral>(Val: Idx2);
4398 if (Integer1 && Integer2) {
4399 if (!llvm::APInt::isSameValue(I1: Integer1->getValue(),
4400 I2: Integer2->getValue()))
4401 return false;
4402 } else {
4403 if (!isSameComparisonOperand(E1: Idx1, E2: Idx2))
4404 return false;
4405 }
4406
4407 return true;
4408 }
4409
4410 // Walk the MemberExpr chain.
4411 while (isa<MemberExpr>(Val: E1) && isa<MemberExpr>(Val: E2)) {
4412 const auto *ME1 = cast<MemberExpr>(Val: E1);
4413 const auto *ME2 = cast<MemberExpr>(Val: E2);
4414 if (!declaresSameEntity(D1: ME1->getMemberDecl(), D2: ME2->getMemberDecl()))
4415 return false;
4416 if (const auto *D = dyn_cast<VarDecl>(Val: ME1->getMemberDecl()))
4417 if (D->isStaticDataMember())
4418 return true;
4419 E1 = ME1->getBase()->IgnoreParenImpCasts();
4420 E2 = ME2->getBase()->IgnoreParenImpCasts();
4421 }
4422
4423 if (isa<CXXThisExpr>(Val: E1) && isa<CXXThisExpr>(Val: E2))
4424 return true;
4425
4426 // A static member variable can end the MemberExpr chain with either
4427 // a MemberExpr or a DeclRefExpr.
4428 auto getAnyDecl = [](const Expr *E) -> const ValueDecl * {
4429 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4430 return DRE->getDecl();
4431 if (const auto *ME = dyn_cast<MemberExpr>(Val: E))
4432 return ME->getMemberDecl();
4433 return nullptr;
4434 };
4435
4436 const ValueDecl *VD1 = getAnyDecl(E1);
4437 const ValueDecl *VD2 = getAnyDecl(E2);
4438 return declaresSameEntity(D1: VD1, D2: VD2);
4439 }
4440 }
4441}
4442
4443/// isArrow - Return true if the base expression is a pointer to vector,
4444/// return false if the base expression is a vector.
4445bool ExtVectorElementExpr::isArrow() const {
4446 return getBase()->getType()->isPointerType();
4447}
4448
4449unsigned ExtVectorElementExpr::getNumElements() const {
4450 if (const VectorType *VT = getType()->getAs<VectorType>())
4451 return VT->getNumElements();
4452 return 1;
4453}
4454
4455unsigned MatrixElementExpr::getNumElements() const {
4456 if (const auto *MT = getType()->getAs<ConstantMatrixType>())
4457 return MT->getNumElementsFlattened();
4458 return 1;
4459}
4460
4461/// containsDuplicateElements - Return true if any Vector element access is
4462/// repeated.
4463bool ExtVectorElementExpr::containsDuplicateElements() const {
4464 // FIXME: Refactor this code to an accessor on the AST node which returns the
4465 // "type" of component access, and share with code below and in Sema.
4466 StringRef Comp = Accessor->getName();
4467
4468 // Halving swizzles do not contain duplicate elements.
4469 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
4470 return false;
4471
4472 // Advance past s-char prefix on hex swizzles.
4473 if (Comp[0] == 's' || Comp[0] == 'S')
4474 Comp = Comp.substr(Start: 1);
4475
4476 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
4477 if (Comp.substr(Start: i + 1).contains(C: Comp[i]))
4478 return true;
4479
4480 return false;
4481}
4482
4483namespace {
4484struct MatrixAccessorFormat {
4485 bool IsZeroIndexed = false;
4486 unsigned ChunkLen = 0;
4487};
4488
4489static MatrixAccessorFormat GetHLSLMatrixAccessorFormat(StringRef Comp) {
4490 assert(!Comp.empty() && Comp[0] == '_' && "invalid matrix accessor");
4491
4492 MatrixAccessorFormat F;
4493 if (Comp.size() >= 2 && Comp[0] == '_' && Comp[1] == 'm') {
4494 F.IsZeroIndexed = true;
4495 F.ChunkLen = 4; // _mRC
4496 } else {
4497 F.IsZeroIndexed = false;
4498 F.ChunkLen = 3; // _RC
4499 }
4500
4501 assert(F.ChunkLen != 0 && "unrecognized matrix swizzle format");
4502 assert(Comp.size() % F.ChunkLen == 0 &&
4503 "matrix swizzle accessor has invalid length");
4504 return F;
4505}
4506
4507template <typename Fn>
4508static bool ForEachMatrixAccessorIndex(StringRef Comp,
4509 const ConstantMatrixType *MT, Fn &&F) {
4510 auto Format = GetHLSLMatrixAccessorFormat(Comp);
4511
4512 for (unsigned I = 0, E = Comp.size(); I < E; I += Format.ChunkLen) {
4513 unsigned Row = 0, Col = 0;
4514 unsigned ZeroIndexOffset = static_cast<unsigned>(Format.IsZeroIndexed);
4515 unsigned OneIndexOffset = static_cast<unsigned>(!Format.IsZeroIndexed);
4516 Row = static_cast<unsigned>(Comp[I + ZeroIndexOffset + 1] - '0') -
4517 OneIndexOffset;
4518 Col = static_cast<unsigned>(Comp[I + ZeroIndexOffset + 2] - '0') -
4519 OneIndexOffset;
4520
4521 assert(Row < MT->getNumRows() && Col < MT->getNumColumns() &&
4522 "matrix swizzle index out of bounds");
4523 // NOTE: AST layer has no access to LangOptions so we will default to row
4524 // major b\c all other AST matrix representations are row major.
4525 // However in codegen we need to convert to column major if the flag
4526 // requires it.
4527 const unsigned Index = MT->getFlattenedIndex(Row, Column: Col, /*IsRowMajor*/ true);
4528 // Callback returns true to continue, false to stop early.
4529 if (!F(Index))
4530 return false;
4531 }
4532 return true;
4533}
4534
4535} // namespace
4536
4537/// containsDuplicateElements - Return true if any Matrix element access is
4538/// repeated.
4539bool MatrixElementExpr::containsDuplicateElements() const {
4540 StringRef Comp = Accessor->getName();
4541 const auto *MT = getBase()->getType()->castAs<ConstantMatrixType>();
4542
4543 llvm::BitVector Seen(MT->getNumElementsFlattened(), /*t=*/false);
4544 bool HasDup = false;
4545 ForEachMatrixAccessorIndex(Comp, MT, F: [&](unsigned Index) -> bool {
4546 if (Seen[Index]) {
4547 HasDup = true;
4548 return false; // exit early
4549 }
4550 Seen.set(Index);
4551 return true;
4552 });
4553
4554 return HasDup;
4555}
4556
4557/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
4558void ExtVectorElementExpr::getEncodedElementAccess(
4559 SmallVectorImpl<uint32_t> &Elts) const {
4560 StringRef Comp = Accessor->getName();
4561 bool isNumericAccessor = false;
4562 if (Comp[0] == 's' || Comp[0] == 'S') {
4563 Comp = Comp.substr(Start: 1);
4564 isNumericAccessor = true;
4565 }
4566
4567 bool isHi = Comp == "hi";
4568 bool isLo = Comp == "lo";
4569 bool isEven = Comp == "even";
4570 bool isOdd = Comp == "odd";
4571
4572 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
4573 uint64_t Index;
4574
4575 if (isHi)
4576 Index = e + i;
4577 else if (isLo)
4578 Index = i;
4579 else if (isEven)
4580 Index = 2 * i;
4581 else if (isOdd)
4582 Index = 2 * i + 1;
4583 else
4584 Index = ExtVectorType::getAccessorIdx(c: Comp[i], isNumericAccessor);
4585
4586 Elts.push_back(Elt: Index);
4587 }
4588}
4589
4590void MatrixElementExpr::getEncodedElementAccess(
4591 SmallVectorImpl<uint32_t> &Elts) const {
4592 StringRef Comp = Accessor->getName();
4593 const auto *MT = getBase()->getType()->castAs<ConstantMatrixType>();
4594 ForEachMatrixAccessorIndex(Comp, MT, F: [&](unsigned Index) -> bool {
4595 Elts.push_back(Elt: Index);
4596 return true;
4597 });
4598}
4599
4600ShuffleVectorExpr::ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr *> args,
4601 QualType Type, SourceLocation BLoc,
4602 SourceLocation RP)
4603 : Expr(ShuffleVectorExprClass, Type, VK_PRValue, OK_Ordinary),
4604 BuiltinLoc(BLoc), RParenLoc(RP) {
4605 ShuffleVectorExprBits.NumExprs = args.size();
4606 SubExprs = new (C) Stmt*[args.size()];
4607 for (unsigned i = 0; i != args.size(); i++)
4608 SubExprs[i] = args[i];
4609
4610 setDependence(computeDependence(E: this));
4611}
4612
4613void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
4614 if (SubExprs) C.Deallocate(Ptr: SubExprs);
4615
4616 this->ShuffleVectorExprBits.NumExprs = Exprs.size();
4617 SubExprs = new (C) Stmt *[ShuffleVectorExprBits.NumExprs];
4618 llvm::copy(Range&: Exprs, Out: SubExprs);
4619}
4620
4621GenericSelectionExpr::GenericSelectionExpr(
4622 const ASTContext &, SourceLocation GenericLoc, Expr *ControllingExpr,
4623 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4624 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4625 bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
4626 : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4627 AssocExprs[ResultIndex]->getValueKind(),
4628 AssocExprs[ResultIndex]->getObjectKind()),
4629 NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4630 IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4631 assert(AssocTypes.size() == AssocExprs.size() &&
4632 "Must have the same number of association expressions"
4633 " and TypeSourceInfo!");
4634 assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4635
4636 GenericSelectionExprBits.GenericLoc = GenericLoc;
4637 getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4638 ControllingExpr;
4639 llvm::copy(Range&: AssocExprs,
4640 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4641 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4642 getIndexOfStartOfAssociatedTypes());
4643
4644 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4645}
4646
4647GenericSelectionExpr::GenericSelectionExpr(
4648 const ASTContext &, SourceLocation GenericLoc,
4649 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4650 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4651 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4652 unsigned ResultIndex)
4653 : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4654 AssocExprs[ResultIndex]->getValueKind(),
4655 AssocExprs[ResultIndex]->getObjectKind()),
4656 NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4657 IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4658 assert(AssocTypes.size() == AssocExprs.size() &&
4659 "Must have the same number of association expressions"
4660 " and TypeSourceInfo!");
4661 assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4662
4663 GenericSelectionExprBits.GenericLoc = GenericLoc;
4664 getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4665 ControllingType;
4666 llvm::copy(Range&: AssocExprs,
4667 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4668 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4669 getIndexOfStartOfAssociatedTypes());
4670
4671 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4672}
4673
4674GenericSelectionExpr::GenericSelectionExpr(
4675 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4676 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4677 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4678 bool ContainsUnexpandedParameterPack)
4679 : Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4680 OK_Ordinary),
4681 NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4682 IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4683 assert(AssocTypes.size() == AssocExprs.size() &&
4684 "Must have the same number of association expressions"
4685 " and TypeSourceInfo!");
4686
4687 GenericSelectionExprBits.GenericLoc = GenericLoc;
4688 getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4689 ControllingExpr;
4690 llvm::copy(Range&: AssocExprs,
4691 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4692 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4693 getIndexOfStartOfAssociatedTypes());
4694
4695 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4696}
4697
4698GenericSelectionExpr::GenericSelectionExpr(
4699 const ASTContext &Context, SourceLocation GenericLoc,
4700 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4701 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4702 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack)
4703 : Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4704 OK_Ordinary),
4705 NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4706 IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4707 assert(AssocTypes.size() == AssocExprs.size() &&
4708 "Must have the same number of association expressions"
4709 " and TypeSourceInfo!");
4710
4711 GenericSelectionExprBits.GenericLoc = GenericLoc;
4712 getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4713 ControllingType;
4714 llvm::copy(Range&: AssocExprs,
4715 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4716 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4717 getIndexOfStartOfAssociatedTypes());
4718
4719 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4720}
4721
4722GenericSelectionExpr::GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs)
4723 : Expr(GenericSelectionExprClass, Empty), NumAssocs(NumAssocs) {}
4724
4725GenericSelectionExpr *GenericSelectionExpr::Create(
4726 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4727 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4728 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4729 bool ContainsUnexpandedParameterPack, unsigned ResultIndex) {
4730 unsigned NumAssocs = AssocExprs.size();
4731 void *Mem = Context.Allocate(
4732 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4733 Align: alignof(GenericSelectionExpr));
4734 return new (Mem) GenericSelectionExpr(
4735 Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4736 RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4737}
4738
4739GenericSelectionExpr *GenericSelectionExpr::Create(
4740 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4741 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4742 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4743 bool ContainsUnexpandedParameterPack) {
4744 unsigned NumAssocs = AssocExprs.size();
4745 void *Mem = Context.Allocate(
4746 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4747 Align: alignof(GenericSelectionExpr));
4748 return new (Mem) GenericSelectionExpr(
4749 Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4750 RParenLoc, ContainsUnexpandedParameterPack);
4751}
4752
4753GenericSelectionExpr *GenericSelectionExpr::Create(
4754 const ASTContext &Context, SourceLocation GenericLoc,
4755 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4756 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4757 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4758 unsigned ResultIndex) {
4759 unsigned NumAssocs = AssocExprs.size();
4760 void *Mem = Context.Allocate(
4761 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4762 Align: alignof(GenericSelectionExpr));
4763 return new (Mem) GenericSelectionExpr(
4764 Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4765 RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4766}
4767
4768GenericSelectionExpr *GenericSelectionExpr::Create(
4769 const ASTContext &Context, SourceLocation GenericLoc,
4770 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4771 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4772 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack) {
4773 unsigned NumAssocs = AssocExprs.size();
4774 void *Mem = Context.Allocate(
4775 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4776 Align: alignof(GenericSelectionExpr));
4777 return new (Mem) GenericSelectionExpr(
4778 Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4779 RParenLoc, ContainsUnexpandedParameterPack);
4780}
4781
4782GenericSelectionExpr *
4783GenericSelectionExpr::CreateEmpty(const ASTContext &Context,
4784 unsigned NumAssocs) {
4785 void *Mem = Context.Allocate(
4786 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4787 Align: alignof(GenericSelectionExpr));
4788 return new (Mem) GenericSelectionExpr(EmptyShell(), NumAssocs);
4789}
4790
4791//===----------------------------------------------------------------------===//
4792// DesignatedInitExpr
4793//===----------------------------------------------------------------------===//
4794
4795const IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
4796 assert(isFieldDesignator() && "Only valid on a field designator");
4797 if (FieldInfo.NameOrField & 0x01)
4798 return reinterpret_cast<IdentifierInfo *>(FieldInfo.NameOrField & ~0x01);
4799 return getFieldDecl()->getIdentifier();
4800}
4801
4802DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
4803 ArrayRef<Designator> Designators,
4804 SourceLocation EqualOrColonLoc,
4805 bool GNUSyntax,
4806 ArrayRef<Expr *> IndexExprs, Expr *Init)
4807 : Expr(DesignatedInitExprClass, Ty, Init->getValueKind(),
4808 Init->getObjectKind()),
4809 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
4810 NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
4811 this->Designators = new (C) Designator[NumDesignators];
4812
4813 // Record the initializer itself.
4814 child_iterator Child = child_begin();
4815 *Child++ = Init;
4816
4817 // Copy the designators and their subexpressions, computing
4818 // value-dependence along the way.
4819 unsigned IndexIdx = 0;
4820 for (unsigned I = 0; I != NumDesignators; ++I) {
4821 this->Designators[I] = Designators[I];
4822 if (this->Designators[I].isArrayDesignator()) {
4823 // Copy the index expressions into permanent storage.
4824 *Child++ = IndexExprs[IndexIdx++];
4825 } else if (this->Designators[I].isArrayRangeDesignator()) {
4826 // Copy the start/end expressions into permanent storage.
4827 *Child++ = IndexExprs[IndexIdx++];
4828 *Child++ = IndexExprs[IndexIdx++];
4829 }
4830 }
4831
4832 assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions");
4833 setDependence(computeDependence(E: this));
4834}
4835
4836DesignatedInitExpr *DesignatedInitExpr::Create(const ASTContext &C,
4837 ArrayRef<Designator> Designators,
4838 ArrayRef<Expr *> IndexExprs,
4839 SourceLocation ColonOrEqualLoc,
4840 bool UsesColonSyntax,
4841 Expr *Init) {
4842 void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: IndexExprs.size() + 1),
4843 Align: alignof(DesignatedInitExpr));
4844 return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
4845 ColonOrEqualLoc, UsesColonSyntax,
4846 IndexExprs, Init);
4847}
4848
4849DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(const ASTContext &C,
4850 unsigned NumIndexExprs) {
4851 void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumIndexExprs + 1),
4852 Align: alignof(DesignatedInitExpr));
4853 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
4854}
4855
4856void DesignatedInitExpr::setDesignators(const ASTContext &C,
4857 const Designator *Desigs,
4858 unsigned NumDesigs) {
4859 Designators = new (C) Designator[NumDesigs];
4860 NumDesignators = NumDesigs;
4861 for (unsigned I = 0; I != NumDesigs; ++I)
4862 Designators[I] = Desigs[I];
4863}
4864
4865SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
4866 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
4867 if (size() == 1)
4868 return DIE->getDesignator(Idx: 0)->getSourceRange();
4869 return SourceRange(DIE->getDesignator(Idx: 0)->getBeginLoc(),
4870 DIE->getDesignator(Idx: size() - 1)->getEndLoc());
4871}
4872
4873SourceLocation DesignatedInitExpr::getBeginLoc() const {
4874 auto *DIE = const_cast<DesignatedInitExpr *>(this);
4875 Designator &First = *DIE->getDesignator(Idx: 0);
4876 if (First.isFieldDesignator()) {
4877 // Skip past implicit designators for anonymous structs/unions, since
4878 // these do not have valid source locations.
4879 for (unsigned int i = 0; i < DIE->size(); i++) {
4880 Designator &Des = *DIE->getDesignator(Idx: i);
4881 SourceLocation retval = GNUSyntax ? Des.getFieldLoc() : Des.getDotLoc();
4882 if (!retval.isValid())
4883 continue;
4884 return retval;
4885 }
4886 }
4887 return First.getLBracketLoc();
4888}
4889
4890SourceLocation DesignatedInitExpr::getEndLoc() const {
4891 return getInit()->getEndLoc();
4892}
4893
4894Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) const {
4895 assert(D.isArrayDesignator() && "Requires array designator");
4896 return getSubExpr(Idx: D.getArrayIndex() + 1);
4897}
4898
4899Expr *DesignatedInitExpr::getArrayRangeStart(const Designator &D) const {
4900 assert(D.isArrayRangeDesignator() && "Requires array range designator");
4901 return getSubExpr(Idx: D.getArrayIndex() + 1);
4902}
4903
4904Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator &D) const {
4905 assert(D.isArrayRangeDesignator() && "Requires array range designator");
4906 return getSubExpr(Idx: D.getArrayIndex() + 2);
4907}
4908
4909/// Replaces the designator at index @p Idx with the series
4910/// of designators in [First, Last).
4911void DesignatedInitExpr::ExpandDesignator(const ASTContext &C, unsigned Idx,
4912 const Designator *First,
4913 const Designator *Last) {
4914 unsigned NumNewDesignators = Last - First;
4915 if (NumNewDesignators == 0) {
4916 std::copy_backward(first: Designators + Idx + 1,
4917 last: Designators + NumDesignators,
4918 result: Designators + Idx);
4919 --NumNewDesignators;
4920 return;
4921 }
4922 if (NumNewDesignators == 1) {
4923 Designators[Idx] = *First;
4924 return;
4925 }
4926
4927 Designator *NewDesignators
4928 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
4929 std::copy(first: Designators, last: Designators + Idx, result: NewDesignators);
4930 std::copy(first: First, last: Last, result: NewDesignators + Idx);
4931 std::copy(first: Designators + Idx + 1, last: Designators + NumDesignators,
4932 result: NewDesignators + Idx + NumNewDesignators);
4933 Designators = NewDesignators;
4934 NumDesignators = NumDesignators - 1 + NumNewDesignators;
4935}
4936
4937DesignatedInitUpdateExpr::DesignatedInitUpdateExpr(const ASTContext &C,
4938 SourceLocation lBraceLoc,
4939 Expr *baseExpr,
4940 SourceLocation rBraceLoc)
4941 : Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_PRValue,
4942 OK_Ordinary) {
4943 BaseAndUpdaterExprs[0] = baseExpr;
4944
4945 InitListExpr *ILE =
4946 new (C) InitListExpr(C, lBraceLoc, {}, rBraceLoc, /*isExplicit=*/false);
4947 ILE->setType(baseExpr->getType());
4948 BaseAndUpdaterExprs[1] = ILE;
4949
4950 // FIXME: this is wrong, set it correctly.
4951 setDependence(ExprDependence::None);
4952}
4953
4954SourceLocation DesignatedInitUpdateExpr::getBeginLoc() const {
4955 return getBase()->getBeginLoc();
4956}
4957
4958SourceLocation DesignatedInitUpdateExpr::getEndLoc() const {
4959 return getBase()->getEndLoc();
4960}
4961
4962ParenListExpr::ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
4963 SourceLocation RParenLoc)
4964 : Expr(ParenListExprClass, QualType(), VK_PRValue, OK_Ordinary),
4965 LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
4966 ParenListExprBits.NumExprs = Exprs.size();
4967 llvm::copy(Range&: Exprs, Out: getTrailingObjects());
4968 setDependence(computeDependence(E: this));
4969}
4970
4971ParenListExpr::ParenListExpr(EmptyShell Empty, unsigned NumExprs)
4972 : Expr(ParenListExprClass, Empty) {
4973 ParenListExprBits.NumExprs = NumExprs;
4974}
4975
4976ParenListExpr *ParenListExpr::Create(const ASTContext &Ctx,
4977 SourceLocation LParenLoc,
4978 ArrayRef<Expr *> Exprs,
4979 SourceLocation RParenLoc) {
4980 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: Exprs.size()),
4981 Align: alignof(ParenListExpr));
4982 return new (Mem) ParenListExpr(LParenLoc, Exprs, RParenLoc);
4983}
4984
4985ParenListExpr *ParenListExpr::CreateEmpty(const ASTContext &Ctx,
4986 unsigned NumExprs) {
4987 void *Mem =
4988 Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumExprs), Align: alignof(ParenListExpr));
4989 return new (Mem) ParenListExpr(EmptyShell(), NumExprs);
4990}
4991
4992/// Certain overflow-dependent code patterns can have their integer overflow
4993/// sanitization disabled. Check for the common pattern `if (a + b < a)` and
4994/// return the resulting BinaryOperator responsible for the addition so we can
4995/// elide overflow checks during codegen.
4996static std::optional<BinaryOperator *>
4997getOverflowPatternBinOp(const BinaryOperator *E) {
4998 Expr *Addition, *ComparedTo;
4999 if (E->getOpcode() == BO_LT) {
5000 Addition = E->getLHS();
5001 ComparedTo = E->getRHS();
5002 } else if (E->getOpcode() == BO_GT) {
5003 Addition = E->getRHS();
5004 ComparedTo = E->getLHS();
5005 } else {
5006 return {};
5007 }
5008
5009 const Expr *AddLHS = nullptr, *AddRHS = nullptr;
5010 BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: Addition);
5011
5012 if (BO && BO->getOpcode() == clang::BO_Add) {
5013 // now store addends for lookup on other side of '>'
5014 AddLHS = BO->getLHS();
5015 AddRHS = BO->getRHS();
5016 }
5017
5018 if (!AddLHS || !AddRHS)
5019 return {};
5020
5021 const Decl *LHSDecl, *RHSDecl, *OtherDecl;
5022
5023 LHSDecl = AddLHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5024 RHSDecl = AddRHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5025 OtherDecl = ComparedTo->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5026
5027 if (!OtherDecl)
5028 return {};
5029
5030 if (!LHSDecl && !RHSDecl)
5031 return {};
5032
5033 if ((LHSDecl && LHSDecl == OtherDecl && LHSDecl != RHSDecl) ||
5034 (RHSDecl && RHSDecl == OtherDecl && RHSDecl != LHSDecl))
5035 return BO;
5036 return {};
5037}
5038
5039/// Compute and set the OverflowPatternExclusion bit based on whether the
5040/// BinaryOperator expression matches an overflow pattern being ignored by
5041/// -fsanitize-undefined-ignore-overflow-pattern=add-signed-overflow-test or
5042/// -fsanitize-undefined-ignore-overflow-pattern=add-unsigned-overflow-test
5043static void computeOverflowPatternExclusion(const ASTContext &Ctx,
5044 const BinaryOperator *E) {
5045 std::optional<BinaryOperator *> Result = getOverflowPatternBinOp(E);
5046 if (!Result.has_value())
5047 return;
5048 QualType AdditionResultType = Result.value()->getType();
5049
5050 if ((AdditionResultType->isSignedIntegerType() &&
5051 Ctx.getLangOpts().isOverflowPatternExcluded(
5052 Kind: LangOptions::OverflowPatternExclusionKind::AddSignedOverflowTest)) ||
5053 (AdditionResultType->isUnsignedIntegerType() &&
5054 Ctx.getLangOpts().isOverflowPatternExcluded(
5055 Kind: LangOptions::OverflowPatternExclusionKind::AddUnsignedOverflowTest)))
5056 Result.value()->setExcludedOverflowPattern(true);
5057}
5058
5059BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
5060 Opcode opc, QualType ResTy, ExprValueKind VK,
5061 ExprObjectKind OK, SourceLocation opLoc,
5062 FPOptionsOverride FPFeatures)
5063 : Expr(BinaryOperatorClass, ResTy, VK, OK) {
5064 BinaryOperatorBits.Opc = opc;
5065 assert(!isCompoundAssignmentOp() &&
5066 "Use CompoundAssignOperator for compound assignments");
5067 BinaryOperatorBits.OpLoc = opLoc;
5068 BinaryOperatorBits.ExcludedOverflowPattern = false;
5069 SubExprs[LHS] = lhs;
5070 SubExprs[RHS] = rhs;
5071 computeOverflowPatternExclusion(Ctx, E: this);
5072 BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5073 if (hasStoredFPFeatures())
5074 setStoredFPFeatures(FPFeatures);
5075 setDependence(computeDependence(E: this));
5076}
5077
5078BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
5079 Opcode opc, QualType ResTy, ExprValueKind VK,
5080 ExprObjectKind OK, SourceLocation opLoc,
5081 FPOptionsOverride FPFeatures, bool dead2)
5082 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK) {
5083 BinaryOperatorBits.Opc = opc;
5084 BinaryOperatorBits.ExcludedOverflowPattern = false;
5085 assert(isCompoundAssignmentOp() &&
5086 "Use CompoundAssignOperator for compound assignments");
5087 BinaryOperatorBits.OpLoc = opLoc;
5088 SubExprs[LHS] = lhs;
5089 SubExprs[RHS] = rhs;
5090 BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5091 if (hasStoredFPFeatures())
5092 setStoredFPFeatures(FPFeatures);
5093 setDependence(computeDependence(E: this));
5094}
5095
5096BinaryOperator *BinaryOperator::CreateEmpty(const ASTContext &C,
5097 bool HasFPFeatures) {
5098 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5099 void *Mem =
5100 C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
5101 return new (Mem) BinaryOperator(EmptyShell());
5102}
5103
5104BinaryOperator *BinaryOperator::Create(const ASTContext &C, Expr *lhs,
5105 Expr *rhs, Opcode opc, QualType ResTy,
5106 ExprValueKind VK, ExprObjectKind OK,
5107 SourceLocation opLoc,
5108 FPOptionsOverride FPFeatures) {
5109 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5110 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5111 void *Mem =
5112 C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
5113 return new (Mem)
5114 BinaryOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures);
5115}
5116
5117CompoundAssignOperator *
5118CompoundAssignOperator::CreateEmpty(const ASTContext &C, bool HasFPFeatures) {
5119 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5120 void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
5121 Align: alignof(CompoundAssignOperator));
5122 return new (Mem) CompoundAssignOperator(C, EmptyShell(), HasFPFeatures);
5123}
5124
5125CompoundAssignOperator *
5126CompoundAssignOperator::Create(const ASTContext &C, Expr *lhs, Expr *rhs,
5127 Opcode opc, QualType ResTy, ExprValueKind VK,
5128 ExprObjectKind OK, SourceLocation opLoc,
5129 FPOptionsOverride FPFeatures,
5130 QualType CompLHSType, QualType CompResultType) {
5131 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5132 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5133 void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
5134 Align: alignof(CompoundAssignOperator));
5135 return new (Mem)
5136 CompoundAssignOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures,
5137 CompLHSType, CompResultType);
5138}
5139
5140UnaryOperator *UnaryOperator::CreateEmpty(const ASTContext &C,
5141 bool hasFPFeatures) {
5142 void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
5143 Align: alignof(UnaryOperator));
5144 return new (Mem) UnaryOperator(hasFPFeatures, EmptyShell());
5145}
5146
5147UnaryOperator::UnaryOperator(const ASTContext &Ctx, Expr *input, Opcode opc,
5148 QualType type, ExprValueKind VK, ExprObjectKind OK,
5149 SourceLocation l, bool CanOverflow,
5150 FPOptionsOverride FPFeatures)
5151 : Expr(UnaryOperatorClass, type, VK, OK), Val(input) {
5152 UnaryOperatorBits.Opc = opc;
5153 UnaryOperatorBits.CanOverflow = CanOverflow;
5154 UnaryOperatorBits.Loc = l;
5155 UnaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5156 if (hasStoredFPFeatures())
5157 setStoredFPFeatures(FPFeatures);
5158 setDependence(computeDependence(E: this, Ctx));
5159}
5160
5161UnaryOperator *UnaryOperator::Create(const ASTContext &C, Expr *input,
5162 Opcode opc, QualType type,
5163 ExprValueKind VK, ExprObjectKind OK,
5164 SourceLocation l, bool CanOverflow,
5165 FPOptionsOverride FPFeatures) {
5166 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5167 unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
5168 void *Mem = C.Allocate(Size, Align: alignof(UnaryOperator));
5169 return new (Mem)
5170 UnaryOperator(C, input, opc, type, VK, OK, l, CanOverflow, FPFeatures);
5171}
5172
5173const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
5174 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(Val: e))
5175 e = ewc->getSubExpr();
5176 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(Val: e))
5177 e = m->getSubExpr();
5178 e = cast<CXXConstructExpr>(Val: e)->getArg(Arg: 0);
5179 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(Val: e))
5180 e = ice->getSubExpr();
5181 return cast<OpaqueValueExpr>(Val: e);
5182}
5183
5184PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &Context,
5185 EmptyShell sh,
5186 unsigned numSemanticExprs) {
5187 void *buffer =
5188 Context.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: 1 + numSemanticExprs),
5189 Align: alignof(PseudoObjectExpr));
5190 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
5191}
5192
5193PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
5194 : Expr(PseudoObjectExprClass, shell) {
5195 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
5196}
5197
5198PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &C, Expr *syntax,
5199 ArrayRef<Expr*> semantics,
5200 unsigned resultIndex) {
5201 assert(syntax && "no syntactic expression!");
5202 assert(semantics.size() && "no semantic expressions!");
5203
5204 QualType type;
5205 ExprValueKind VK;
5206 if (resultIndex == NoResult) {
5207 type = C.VoidTy;
5208 VK = VK_PRValue;
5209 } else {
5210 assert(resultIndex < semantics.size());
5211 type = semantics[resultIndex]->getType();
5212 VK = semantics[resultIndex]->getValueKind();
5213 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary);
5214 }
5215
5216 void *buffer = C.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: semantics.size() + 1),
5217 Align: alignof(PseudoObjectExpr));
5218 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
5219 resultIndex);
5220}
5221
5222PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
5223 Expr *syntax, ArrayRef<Expr *> semantics,
5224 unsigned resultIndex)
5225 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary) {
5226 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
5227 PseudoObjectExprBits.ResultIndex = resultIndex + 1;
5228 MutableArrayRef<Expr *> Trail = getTrailingObjects(N: semantics.size() + 1);
5229 Trail[0] = syntax;
5230
5231 assert(llvm::all_of(semantics,
5232 [](const Expr *E) {
5233 return !isa<OpaqueValueExpr>(E) ||
5234 cast<OpaqueValueExpr>(E)->getSourceExpr() !=
5235 nullptr;
5236 }) &&
5237 "opaque-value semantic expressions for pseudo-object "
5238 "operations must have sources");
5239
5240 llvm::copy(Range&: semantics, Out: Trail.drop_front().begin());
5241 setDependence(computeDependence(E: this));
5242}
5243
5244//===----------------------------------------------------------------------===//
5245// Child Iterators for iterating over subexpressions/substatements
5246//===----------------------------------------------------------------------===//
5247
5248// UnaryExprOrTypeTraitExpr
5249Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
5250 const_child_range CCR =
5251 const_cast<const UnaryExprOrTypeTraitExpr *>(this)->children();
5252 return child_range(cast_away_const(RHS: CCR.begin()), cast_away_const(RHS: CCR.end()));
5253}
5254
5255Stmt::const_child_range UnaryExprOrTypeTraitExpr::children() const {
5256 // If this is of a type and the type is a VLA type (and not a typedef), the
5257 // size expression of the VLA needs to be treated as an executable expression.
5258 // Why isn't this weirdness documented better in StmtIterator?
5259 if (isArgumentType()) {
5260 if (const VariableArrayType *T =
5261 dyn_cast<VariableArrayType>(Val: getArgumentType().getTypePtr()))
5262 return const_child_range(const_child_iterator(T), const_child_iterator());
5263 return const_child_range(const_child_iterator(), const_child_iterator());
5264 }
5265 return const_child_range(&Argument.Ex, &Argument.Ex + 1);
5266}
5267
5268AtomicExpr::AtomicExpr(SourceLocation BLoc, ArrayRef<Expr *> args, QualType t,
5269 AtomicOp op, SourceLocation RP)
5270 : Expr(AtomicExprClass, t, VK_PRValue, OK_Ordinary),
5271 NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) {
5272 assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions");
5273 for (unsigned i = 0; i != args.size(); i++)
5274 SubExprs[i] = args[i];
5275 setDependence(computeDependence(E: this));
5276}
5277
5278unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) {
5279 switch (Op) {
5280 case AO__c11_atomic_init:
5281 case AO__opencl_atomic_init:
5282 case AO__c11_atomic_load:
5283 case AO__atomic_load_n:
5284 case AO__atomic_test_and_set:
5285 case AO__atomic_clear:
5286 return 2;
5287
5288 case AO__scoped_atomic_load_n:
5289 case AO__opencl_atomic_load:
5290 case AO__hip_atomic_load:
5291 case AO__c11_atomic_store:
5292 case AO__c11_atomic_exchange:
5293 case AO__atomic_load:
5294 case AO__atomic_store:
5295 case AO__atomic_store_n:
5296 case AO__atomic_exchange_n:
5297 case AO__c11_atomic_fetch_add:
5298 case AO__c11_atomic_fetch_sub:
5299 case AO__c11_atomic_fetch_and:
5300 case AO__c11_atomic_fetch_or:
5301 case AO__c11_atomic_fetch_xor:
5302 case AO__c11_atomic_fetch_nand:
5303 case AO__c11_atomic_fetch_max:
5304 case AO__c11_atomic_fetch_min:
5305 case AO__atomic_fetch_add:
5306 case AO__atomic_fetch_sub:
5307 case AO__atomic_fetch_and:
5308 case AO__atomic_fetch_or:
5309 case AO__atomic_fetch_xor:
5310 case AO__atomic_fetch_nand:
5311 case AO__atomic_add_fetch:
5312 case AO__atomic_sub_fetch:
5313 case AO__atomic_and_fetch:
5314 case AO__atomic_or_fetch:
5315 case AO__atomic_xor_fetch:
5316 case AO__atomic_nand_fetch:
5317 case AO__atomic_min_fetch:
5318 case AO__atomic_max_fetch:
5319 case AO__atomic_fetch_min:
5320 case AO__atomic_fetch_max:
5321 case AO__atomic_fetch_fminimum:
5322 case AO__atomic_fetch_fmaximum:
5323 case AO__atomic_fetch_fminimum_num:
5324 case AO__atomic_fetch_fmaximum_num:
5325 case AO__atomic_fetch_uinc:
5326 case AO__atomic_fetch_udec:
5327 return 3;
5328
5329 case AO__scoped_atomic_load:
5330 case AO__scoped_atomic_store:
5331 case AO__scoped_atomic_store_n:
5332 case AO__scoped_atomic_fetch_add:
5333 case AO__scoped_atomic_fetch_sub:
5334 case AO__scoped_atomic_fetch_and:
5335 case AO__scoped_atomic_fetch_or:
5336 case AO__scoped_atomic_fetch_xor:
5337 case AO__scoped_atomic_fetch_nand:
5338 case AO__scoped_atomic_add_fetch:
5339 case AO__scoped_atomic_sub_fetch:
5340 case AO__scoped_atomic_and_fetch:
5341 case AO__scoped_atomic_or_fetch:
5342 case AO__scoped_atomic_xor_fetch:
5343 case AO__scoped_atomic_nand_fetch:
5344 case AO__scoped_atomic_min_fetch:
5345 case AO__scoped_atomic_max_fetch:
5346 case AO__scoped_atomic_fetch_min:
5347 case AO__scoped_atomic_fetch_max:
5348 case AO__scoped_atomic_fetch_fminimum:
5349 case AO__scoped_atomic_fetch_fmaximum:
5350 case AO__scoped_atomic_fetch_fminimum_num:
5351 case AO__scoped_atomic_fetch_fmaximum_num:
5352 case AO__scoped_atomic_exchange_n:
5353 case AO__scoped_atomic_fetch_uinc:
5354 case AO__scoped_atomic_fetch_udec:
5355 case AO__hip_atomic_exchange:
5356 case AO__hip_atomic_fetch_add:
5357 case AO__hip_atomic_fetch_sub:
5358 case AO__hip_atomic_fetch_and:
5359 case AO__hip_atomic_fetch_or:
5360 case AO__hip_atomic_fetch_xor:
5361 case AO__hip_atomic_fetch_min:
5362 case AO__hip_atomic_fetch_max:
5363 case AO__opencl_atomic_store:
5364 case AO__hip_atomic_store:
5365 case AO__opencl_atomic_exchange:
5366 case AO__opencl_atomic_fetch_add:
5367 case AO__opencl_atomic_fetch_sub:
5368 case AO__opencl_atomic_fetch_and:
5369 case AO__opencl_atomic_fetch_or:
5370 case AO__opencl_atomic_fetch_xor:
5371 case AO__opencl_atomic_fetch_min:
5372 case AO__opencl_atomic_fetch_max:
5373 case AO__atomic_exchange:
5374 return 4;
5375
5376 case AO__scoped_atomic_exchange:
5377 case AO__c11_atomic_compare_exchange_strong:
5378 case AO__c11_atomic_compare_exchange_weak:
5379 return 5;
5380 case AO__hip_atomic_compare_exchange_strong:
5381 case AO__opencl_atomic_compare_exchange_strong:
5382 case AO__opencl_atomic_compare_exchange_weak:
5383 case AO__hip_atomic_compare_exchange_weak:
5384 case AO__atomic_compare_exchange:
5385 case AO__atomic_compare_exchange_n:
5386 return 6;
5387
5388 case AO__scoped_atomic_compare_exchange:
5389 case AO__scoped_atomic_compare_exchange_n:
5390 return 7;
5391 }
5392 llvm_unreachable("unknown atomic op");
5393}
5394
5395QualType AtomicExpr::getValueType() const {
5396 auto T = getPtr()->getType()->castAs<PointerType>()->getPointeeType();
5397 if (auto AT = T->getAs<AtomicType>())
5398 return AT->getValueType();
5399 return T;
5400}
5401
5402QualType ArraySectionExpr::getBaseOriginalType(const Expr *Base) {
5403 unsigned ArraySectionCount = 0;
5404 while (auto *OASE = dyn_cast<ArraySectionExpr>(Val: Base->IgnoreParens())) {
5405 Base = OASE->getBase();
5406 ++ArraySectionCount;
5407 }
5408 while (auto *ASE =
5409 dyn_cast<ArraySubscriptExpr>(Val: Base->IgnoreParenImpCasts())) {
5410 Base = ASE->getBase();
5411 ++ArraySectionCount;
5412 }
5413 Base = Base->IgnoreParenImpCasts();
5414 auto OriginalTy = Base->getType();
5415 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: Base))
5416 if (auto *PVD = dyn_cast<ParmVarDecl>(Val: DRE->getDecl()))
5417 OriginalTy = PVD->getOriginalType().getNonReferenceType();
5418
5419 for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
5420 if (OriginalTy->isAnyPointerType())
5421 OriginalTy = OriginalTy->getPointeeType();
5422 else if (OriginalTy->isArrayType())
5423 OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
5424 else
5425 return {};
5426 }
5427 return OriginalTy;
5428}
5429
5430QualType ArraySectionExpr::getElementType() const {
5431 QualType BaseTy = getBase()->IgnoreParenImpCasts()->getType();
5432 // We only have to look into the array section exprs, else we will get the
5433 // type of the base, which should already be valid.
5434 if (auto *ASE = dyn_cast<ArraySectionExpr>(Val: getBase()->IgnoreParenImpCasts()))
5435 BaseTy = ASE->getElementType();
5436
5437 if (BaseTy->isAnyPointerType())
5438 return BaseTy->getPointeeType();
5439 if (BaseTy->isArrayType())
5440 return BaseTy->castAsArrayTypeUnsafe()->getElementType();
5441
5442 // If this isn't a pointer or array, the base is a dependent expression, so
5443 // just return the BaseTy anyway.
5444 assert(BaseTy->isInstantiationDependentType());
5445 return BaseTy;
5446}
5447
5448QualType ArraySectionExpr::getBaseType() const {
5449 // We only have to look into the array section exprs, else we will get the
5450 // type of the base, which should already be valid.
5451 if (auto *ASE = dyn_cast<ArraySectionExpr>(Val: getBase()->IgnoreParenImpCasts()))
5452 return ASE->getElementType();
5453
5454 return getBase()->IgnoreParenImpCasts()->getType();
5455}
5456
5457RecoveryExpr::RecoveryExpr(ASTContext &Ctx, QualType T, SourceLocation BeginLoc,
5458 SourceLocation EndLoc, ArrayRef<Expr *> SubExprs)
5459 : Expr(RecoveryExprClass, T.getNonReferenceType(),
5460 T->isDependentType() ? VK_LValue : getValueKindForType(T),
5461 OK_Ordinary),
5462 BeginLoc(BeginLoc), EndLoc(EndLoc), NumExprs(SubExprs.size()) {
5463 assert(!T.isNull());
5464 assert(!llvm::is_contained(SubExprs, nullptr));
5465
5466 llvm::copy(Range&: SubExprs, Out: getTrailingObjects());
5467 setDependence(computeDependence(E: this));
5468}
5469
5470RecoveryExpr *RecoveryExpr::Create(ASTContext &Ctx, QualType T,
5471 SourceLocation BeginLoc,
5472 SourceLocation EndLoc,
5473 ArrayRef<Expr *> SubExprs) {
5474 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: SubExprs.size()),
5475 Align: alignof(RecoveryExpr));
5476 return new (Mem) RecoveryExpr(Ctx, T, BeginLoc, EndLoc, SubExprs);
5477}
5478
5479RecoveryExpr *RecoveryExpr::CreateEmpty(ASTContext &Ctx, unsigned NumSubExprs) {
5480 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: NumSubExprs),
5481 Align: alignof(RecoveryExpr));
5482 return new (Mem) RecoveryExpr(EmptyShell(), NumSubExprs);
5483}
5484
5485void OMPArrayShapingExpr::setDimensions(ArrayRef<Expr *> Dims) {
5486 assert(
5487 NumDims == Dims.size() &&
5488 "Preallocated number of dimensions is different from the provided one.");
5489 llvm::copy(Range&: Dims, Out: getTrailingObjects<Expr *>());
5490}
5491
5492void OMPArrayShapingExpr::setBracketsRanges(ArrayRef<SourceRange> BR) {
5493 assert(
5494 NumDims == BR.size() &&
5495 "Preallocated number of dimensions is different from the provided one.");
5496 llvm::copy(Range&: BR, Out: getTrailingObjects<SourceRange>());
5497}
5498
5499OMPArrayShapingExpr::OMPArrayShapingExpr(QualType ExprTy, Expr *Op,
5500 SourceLocation L, SourceLocation R,
5501 ArrayRef<Expr *> Dims)
5502 : Expr(OMPArrayShapingExprClass, ExprTy, VK_LValue, OK_Ordinary), LPLoc(L),
5503 RPLoc(R), NumDims(Dims.size()) {
5504 setBase(Op);
5505 setDimensions(Dims);
5506 setDependence(computeDependence(E: this));
5507}
5508
5509OMPArrayShapingExpr *
5510OMPArrayShapingExpr::Create(const ASTContext &Context, QualType T, Expr *Op,
5511 SourceLocation L, SourceLocation R,
5512 ArrayRef<Expr *> Dims,
5513 ArrayRef<SourceRange> BracketRanges) {
5514 assert(Dims.size() == BracketRanges.size() &&
5515 "Different number of dimensions and brackets ranges.");
5516 void *Mem = Context.Allocate(
5517 Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: Dims.size() + 1, Counts: Dims.size()),
5518 Align: alignof(OMPArrayShapingExpr));
5519 auto *E = new (Mem) OMPArrayShapingExpr(T, Op, L, R, Dims);
5520 E->setBracketsRanges(BracketRanges);
5521 return E;
5522}
5523
5524OMPArrayShapingExpr *OMPArrayShapingExpr::CreateEmpty(const ASTContext &Context,
5525 unsigned NumDims) {
5526 void *Mem = Context.Allocate(
5527 Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: NumDims + 1, Counts: NumDims),
5528 Align: alignof(OMPArrayShapingExpr));
5529 return new (Mem) OMPArrayShapingExpr(EmptyShell(), NumDims);
5530}
5531
5532void OMPIteratorExpr::setIteratorDeclaration(unsigned I, Decl *D) {
5533 getTrailingObjects<Decl *>(N: NumIterators)[I] = D;
5534}
5535
5536void OMPIteratorExpr::setAssignmentLoc(unsigned I, SourceLocation Loc) {
5537 assert(I < NumIterators &&
5538 "Idx is greater or equal the number of iterators definitions.");
5539 getTrailingObjects<
5540 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5541 static_cast<int>(RangeLocOffset::AssignLoc)] = Loc;
5542}
5543
5544void OMPIteratorExpr::setIteratorRange(unsigned I, Expr *Begin,
5545 SourceLocation ColonLoc, Expr *End,
5546 SourceLocation SecondColonLoc,
5547 Expr *Step) {
5548 assert(I < NumIterators &&
5549 "Idx is greater or equal the number of iterators definitions.");
5550 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5551 static_cast<int>(RangeExprOffset::Begin)] =
5552 Begin;
5553 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5554 static_cast<int>(RangeExprOffset::End)] = End;
5555 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5556 static_cast<int>(RangeExprOffset::Step)] = Step;
5557 getTrailingObjects<
5558 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5559 static_cast<int>(RangeLocOffset::FirstColonLoc)] =
5560 ColonLoc;
5561 getTrailingObjects<
5562 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5563 static_cast<int>(RangeLocOffset::SecondColonLoc)] =
5564 SecondColonLoc;
5565}
5566
5567Decl *OMPIteratorExpr::getIteratorDecl(unsigned I) {
5568 return getTrailingObjects<Decl *>()[I];
5569}
5570
5571OMPIteratorExpr::IteratorRange OMPIteratorExpr::getIteratorRange(unsigned I) {
5572 IteratorRange Res;
5573 Res.Begin =
5574 getTrailingObjects<Expr *>()[I * static_cast<int>(
5575 RangeExprOffset::Total) +
5576 static_cast<int>(RangeExprOffset::Begin)];
5577 Res.End =
5578 getTrailingObjects<Expr *>()[I * static_cast<int>(
5579 RangeExprOffset::Total) +
5580 static_cast<int>(RangeExprOffset::End)];
5581 Res.Step =
5582 getTrailingObjects<Expr *>()[I * static_cast<int>(
5583 RangeExprOffset::Total) +
5584 static_cast<int>(RangeExprOffset::Step)];
5585 return Res;
5586}
5587
5588SourceLocation OMPIteratorExpr::getAssignLoc(unsigned I) const {
5589 return getTrailingObjects<
5590 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5591 static_cast<int>(RangeLocOffset::AssignLoc)];
5592}
5593
5594SourceLocation OMPIteratorExpr::getColonLoc(unsigned I) const {
5595 return getTrailingObjects<
5596 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5597 static_cast<int>(RangeLocOffset::FirstColonLoc)];
5598}
5599
5600SourceLocation OMPIteratorExpr::getSecondColonLoc(unsigned I) const {
5601 return getTrailingObjects<
5602 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5603 static_cast<int>(RangeLocOffset::SecondColonLoc)];
5604}
5605
5606void OMPIteratorExpr::setHelper(unsigned I, const OMPIteratorHelperData &D) {
5607 getTrailingObjects<OMPIteratorHelperData>()[I] = D;
5608}
5609
5610OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) {
5611 return getTrailingObjects<OMPIteratorHelperData>()[I];
5612}
5613
5614const OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) const {
5615 return getTrailingObjects<OMPIteratorHelperData>()[I];
5616}
5617
5618OMPIteratorExpr::OMPIteratorExpr(
5619 QualType ExprTy, SourceLocation IteratorKwLoc, SourceLocation L,
5620 SourceLocation R, ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5621 ArrayRef<OMPIteratorHelperData> Helpers)
5622 : Expr(OMPIteratorExprClass, ExprTy, VK_LValue, OK_Ordinary),
5623 IteratorKwLoc(IteratorKwLoc), LPLoc(L), RPLoc(R),
5624 NumIterators(Data.size()) {
5625 for (unsigned I = 0, E = Data.size(); I < E; ++I) {
5626 const IteratorDefinition &D = Data[I];
5627 setIteratorDeclaration(I, D: D.IteratorDecl);
5628 setAssignmentLoc(I, Loc: D.AssignmentLoc);
5629 setIteratorRange(I, Begin: D.Range.Begin, ColonLoc: D.ColonLoc, End: D.Range.End,
5630 SecondColonLoc: D.SecondColonLoc, Step: D.Range.Step);
5631 setHelper(I, D: Helpers[I]);
5632 }
5633 setDependence(computeDependence(E: this));
5634}
5635
5636OMPIteratorExpr *
5637OMPIteratorExpr::Create(const ASTContext &Context, QualType T,
5638 SourceLocation IteratorKwLoc, SourceLocation L,
5639 SourceLocation R,
5640 ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5641 ArrayRef<OMPIteratorHelperData> Helpers) {
5642 assert(Data.size() == Helpers.size() &&
5643 "Data and helpers must have the same size.");
5644 void *Mem = Context.Allocate(
5645 Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5646 Counts: Data.size(), Counts: Data.size() * static_cast<int>(RangeExprOffset::Total),
5647 Counts: Data.size() * static_cast<int>(RangeLocOffset::Total),
5648 Counts: Helpers.size()),
5649 Align: alignof(OMPIteratorExpr));
5650 return new (Mem) OMPIteratorExpr(T, IteratorKwLoc, L, R, Data, Helpers);
5651}
5652
5653OMPIteratorExpr *OMPIteratorExpr::CreateEmpty(const ASTContext &Context,
5654 unsigned NumIterators) {
5655 void *Mem = Context.Allocate(
5656 Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5657 Counts: NumIterators, Counts: NumIterators * static_cast<int>(RangeExprOffset::Total),
5658 Counts: NumIterators * static_cast<int>(RangeLocOffset::Total), Counts: NumIterators),
5659 Align: alignof(OMPIteratorExpr));
5660 return new (Mem) OMPIteratorExpr(EmptyShell(), NumIterators);
5661}
5662
5663HLSLOutArgExpr *HLSLOutArgExpr::Create(const ASTContext &C, QualType Ty,
5664 OpaqueValueExpr *Base,
5665 OpaqueValueExpr *OpV, Expr *WB,
5666 bool IsInOut) {
5667 return new (C) HLSLOutArgExpr(Ty, Base, OpV, WB, IsInOut);
5668}
5669
5670HLSLOutArgExpr *HLSLOutArgExpr::CreateEmpty(const ASTContext &C) {
5671 return new (C) HLSLOutArgExpr(EmptyShell());
5672}
5673
5674OpenACCAsteriskSizeExpr *OpenACCAsteriskSizeExpr::Create(const ASTContext &C,
5675 SourceLocation Loc) {
5676 return new (C) OpenACCAsteriskSizeExpr(Loc, C.IntTy);
5677}
5678
5679OpenACCAsteriskSizeExpr *
5680OpenACCAsteriskSizeExpr::CreateEmpty(const ASTContext &C) {
5681 return new (C) OpenACCAsteriskSizeExpr({}, C.IntTy);
5682}
5683
5684ConvertVectorExpr *ConvertVectorExpr::CreateEmpty(const ASTContext &C,
5685 bool hasFPFeatures) {
5686 void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
5687 Align: alignof(ConvertVectorExpr));
5688 return new (Mem) ConvertVectorExpr(hasFPFeatures, EmptyShell());
5689}
5690
5691ConvertVectorExpr *ConvertVectorExpr::Create(
5692 const ASTContext &C, Expr *SrcExpr, TypeSourceInfo *TI, QualType DstType,
5693 ExprValueKind VK, ExprObjectKind OK, SourceLocation BuiltinLoc,
5694 SourceLocation RParenLoc, FPOptionsOverride FPFeatures) {
5695 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5696 unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
5697 void *Mem = C.Allocate(Size, Align: alignof(ConvertVectorExpr));
5698 return new (Mem) ConvertVectorExpr(SrcExpr, TI, DstType, VK, OK, BuiltinLoc,
5699 RParenLoc, FPFeatures);
5700}
5701
5702APValue &CompoundLiteralExpr::getOrCreateStaticValue(ASTContext &Ctx) const {
5703 assert(hasStaticStorage());
5704 if (!StaticValue) {
5705 StaticValue = new (Ctx) APValue;
5706 Ctx.addDestruction(Ptr: StaticValue);
5707 }
5708 return *StaticValue;
5709}
5710
5711APValue &CompoundLiteralExpr::getStaticValue() const {
5712 assert(StaticValue);
5713 return *StaticValue;
5714}
5715
5716namespace {
5717/// Visitor that walks an Expr to the head of a struct-field access chain;
5718/// see clang::findStructFieldAccess.
5719class StructFieldAccessVisitor
5720 : public ConstStmtVisitor<StructFieldAccessVisitor, const Expr *> {
5721 bool AddrOfSeen = false;
5722
5723public:
5724 const Expr *ArrayIndex = nullptr;
5725 QualType ArrayElementTy;
5726
5727 const Expr *VisitMemberExpr(const MemberExpr *E) {
5728 if (AddrOfSeen && E->getType()->isArrayType())
5729 // '&fam' designates the array object as a whole, not the
5730 // pointer-to-element value that 'fam' decays to.
5731 return nullptr;
5732 return E;
5733 }
5734
5735 const Expr *VisitArraySubscriptExpr(const ArraySubscriptExpr *E) {
5736 if (ArrayIndex)
5737 // We don't support multiple subscripts.
5738 return nullptr;
5739
5740 AddrOfSeen = false; // '&ptr->array[idx]' is okay.
5741 ArrayIndex = E->getIdx();
5742 ArrayElementTy = E->getBase()->getType();
5743 return Visit(S: E->getBase());
5744 }
5745 const Expr *VisitCastExpr(const CastExpr *E) {
5746 if (E->getCastKind() == CK_LValueToRValue)
5747 return E;
5748 return Visit(S: E->getSubExpr());
5749 }
5750 const Expr *VisitParenExpr(const ParenExpr *E) {
5751 return Visit(S: E->getSubExpr());
5752 }
5753 const Expr *VisitUnaryAddrOf(const UnaryOperator *E) {
5754 AddrOfSeen = true;
5755 return Visit(S: E->getSubExpr());
5756 }
5757 const Expr *VisitUnaryDeref(const UnaryOperator *E) {
5758 AddrOfSeen = false;
5759 return Visit(S: E->getSubExpr());
5760 }
5761 const Expr *VisitBinaryOperator(const BinaryOperator *Op) {
5762 return Op->isCommaOp() ? Visit(S: Op->getRHS()) : nullptr;
5763 }
5764};
5765} // namespace
5766
5767const Expr *clang::findStructFieldAccess(const Expr *E,
5768 const Expr **OutArrayIndex,
5769 QualType *OutArrayElementTy) {
5770 StructFieldAccessVisitor V;
5771 const Expr *Result = V.Visit(S: E);
5772 if (OutArrayIndex)
5773 *OutArrayIndex = V.ArrayIndex;
5774 if (OutArrayElementTy)
5775 *OutArrayElementTy = V.ArrayElementTy;
5776 return Result;
5777}
5778