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 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
480 TemplateKWLoc, List: *TemplateArgs,
481 OutArgArray: getTrailingObjects<TemplateArgumentLoc>());
482#ifndef NDEBUG
483 auto Deps = TemplateArgumentDependence::None;
484 for (const TemplateArgumentLoc &Loc : TemplateArgs->arguments())
485 Deps |= Loc.getArgument().getDependence();
486 assert(!(Deps & TemplateArgumentDependence::Dependent) &&
487 "built a DeclRefExpr with dependent template args");
488#endif
489 } else if (TemplateKWLoc.isValid()) {
490 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
491 TemplateKWLoc);
492 }
493 DeclRefExprBits.IsImmediateEscalating = false;
494 DeclRefExprBits.HadMultipleCandidates = 0;
495 setDependence(computeDependence(E: this, Ctx));
496}
497
498DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
499 NestedNameSpecifierLoc QualifierLoc,
500 SourceLocation TemplateKWLoc, ValueDecl *D,
501 bool RefersToEnclosingVariableOrCapture,
502 SourceLocation NameLoc, QualType T,
503 ExprValueKind VK, NamedDecl *FoundD,
504 const TemplateArgumentListInfo *TemplateArgs,
505 NonOdrUseReason NOUR) {
506 return Create(Context, QualifierLoc, TemplateKWLoc, D,
507 RefersToEnclosingVariableOrCapture,
508 NameInfo: DeclarationNameInfo(D->getDeclName(), NameLoc),
509 T, VK, FoundD, TemplateArgs, NOUR);
510}
511
512DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
513 NestedNameSpecifierLoc QualifierLoc,
514 SourceLocation TemplateKWLoc, ValueDecl *D,
515 bool RefersToEnclosingVariableOrCapture,
516 const DeclarationNameInfo &NameInfo,
517 QualType T, ExprValueKind VK,
518 NamedDecl *FoundD,
519 const TemplateArgumentListInfo *TemplateArgs,
520 NonOdrUseReason NOUR) {
521 // Filter out cases where the found Decl is the same as the value refenenced.
522 if (D == FoundD)
523 FoundD = nullptr;
524
525 bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
526 std::size_t Size =
527 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
528 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
529 Counts: QualifierLoc ? 1 : 0, Counts: FoundD ? 1 : 0,
530 Counts: HasTemplateKWAndArgsInfo ? 1 : 0,
531 Counts: TemplateArgs ? TemplateArgs->size() : 0);
532
533 void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
534 return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
535 RefersToEnclosingVariableOrCapture, NameInfo,
536 FoundD, TemplateArgs, T, VK, NOUR);
537}
538
539DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
540 bool HasQualifier,
541 bool HasFoundDecl,
542 bool HasTemplateKWAndArgsInfo,
543 unsigned NumTemplateArgs) {
544 assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
545 std::size_t Size =
546 totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
547 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
548 Counts: HasQualifier ? 1 : 0, Counts: HasFoundDecl ? 1 : 0, Counts: HasTemplateKWAndArgsInfo,
549 Counts: NumTemplateArgs);
550 void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
551 return new (Mem) DeclRefExpr(EmptyShell());
552}
553
554void DeclRefExpr::setDecl(ValueDecl *NewD) {
555 D = NewD;
556 if (getType()->isUndeducedType())
557 setType(NewD->getType());
558 setDependence(computeDependence(E: this, Ctx: NewD->getASTContext()));
559}
560
561SourceLocation DeclRefExpr::getEndLoc() const {
562 if (hasExplicitTemplateArgs())
563 return getRAngleLoc();
564 return getNameInfo().getEndLoc();
565}
566
567SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(SourceLocation OpLoc,
568 SourceLocation LParen,
569 SourceLocation RParen,
570 QualType ResultTy,
571 TypeSourceInfo *TSI)
572 : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary),
573 OpLoc(OpLoc), LParen(LParen), RParen(RParen) {
574 setTypeSourceInfo(TSI);
575 setDependence(computeDependence(E: this));
576}
577
578SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(EmptyShell Empty,
579 QualType ResultTy)
580 : Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary) {}
581
582SYCLUniqueStableNameExpr *
583SYCLUniqueStableNameExpr::Create(const ASTContext &Ctx, SourceLocation OpLoc,
584 SourceLocation LParen, SourceLocation RParen,
585 TypeSourceInfo *TSI) {
586 QualType ResultTy = Ctx.getPointerType(T: Ctx.CharTy.withConst());
587 return new (Ctx)
588 SYCLUniqueStableNameExpr(OpLoc, LParen, RParen, ResultTy, TSI);
589}
590
591SYCLUniqueStableNameExpr *
592SYCLUniqueStableNameExpr::CreateEmpty(const ASTContext &Ctx) {
593 QualType ResultTy = Ctx.getPointerType(T: Ctx.CharTy.withConst());
594 return new (Ctx) SYCLUniqueStableNameExpr(EmptyShell(), ResultTy);
595}
596
597std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context) const {
598 return SYCLUniqueStableNameExpr::ComputeName(Context,
599 Ty: getTypeSourceInfo()->getType());
600}
601
602std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
603 QualType Ty) {
604 auto MangleCallback = [](ASTContext &Ctx,
605 const NamedDecl *ND) -> UnsignedOrNone {
606 if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: ND))
607 return RD->getDeviceLambdaManglingNumber();
608 return std::nullopt;
609 };
610
611 std::unique_ptr<MangleContext> Ctx{ItaniumMangleContext::create(
612 Context, Diags&: Context.getDiagnostics(), Discriminator: MangleCallback)};
613
614 std::string Buffer;
615 Buffer.reserve(res_arg: 128);
616 llvm::raw_string_ostream Out(Buffer);
617 Ctx->mangleCanonicalTypeName(T: Ty, Out);
618
619 return Buffer;
620}
621
622PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy,
623 PredefinedIdentKind IK, bool IsTransparent,
624 StringLiteral *SL)
625 : Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary) {
626 PredefinedExprBits.Kind = llvm::to_underlying(E: IK);
627 assert((getIdentKind() == IK) &&
628 "IdentKind do not fit in PredefinedExprBitfields!");
629 bool HasFunctionName = SL != nullptr;
630 PredefinedExprBits.HasFunctionName = HasFunctionName;
631 PredefinedExprBits.IsTransparent = IsTransparent;
632 PredefinedExprBits.Loc = L;
633 if (HasFunctionName)
634 setFunctionName(SL);
635 setDependence(computeDependence(E: this));
636}
637
638PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
639 : Expr(PredefinedExprClass, Empty) {
640 PredefinedExprBits.HasFunctionName = HasFunctionName;
641}
642
643PredefinedExpr *PredefinedExpr::Create(const ASTContext &Ctx, SourceLocation L,
644 QualType FNTy, PredefinedIdentKind IK,
645 bool IsTransparent, StringLiteral *SL) {
646 bool HasFunctionName = SL != nullptr;
647 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
648 Align: alignof(PredefinedExpr));
649 return new (Mem) PredefinedExpr(L, FNTy, IK, IsTransparent, SL);
650}
651
652PredefinedExpr *PredefinedExpr::CreateEmpty(const ASTContext &Ctx,
653 bool HasFunctionName) {
654 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
655 Align: alignof(PredefinedExpr));
656 return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
657}
658
659StringRef PredefinedExpr::getIdentKindName(PredefinedIdentKind IK) {
660 switch (IK) {
661 case PredefinedIdentKind::Func:
662 return "__func__";
663 case PredefinedIdentKind::Function:
664 return "__FUNCTION__";
665 case PredefinedIdentKind::FuncDName:
666 return "__FUNCDNAME__";
667 case PredefinedIdentKind::LFunction:
668 return "L__FUNCTION__";
669 case PredefinedIdentKind::PrettyFunction:
670 return "__PRETTY_FUNCTION__";
671 case PredefinedIdentKind::FuncSig:
672 return "__FUNCSIG__";
673 case PredefinedIdentKind::LFuncSig:
674 return "L__FUNCSIG__";
675 case PredefinedIdentKind::PrettyFunctionNoVirtual:
676 break;
677 }
678 llvm_unreachable("Unknown ident kind for PredefinedExpr");
679}
680
681// FIXME: Maybe this should use DeclPrinter with a special "print predefined
682// expr" policy instead.
683std::string PredefinedExpr::ComputeName(PredefinedIdentKind IK,
684 const Decl *CurrentDecl,
685 bool ForceElaboratedPrinting) {
686 ASTContext &Context = CurrentDecl->getASTContext();
687
688 if (IK == PredefinedIdentKind::FuncDName) {
689 if (const NamedDecl *ND = dyn_cast<NamedDecl>(Val: CurrentDecl)) {
690 std::unique_ptr<MangleContext> MC;
691 MC.reset(p: Context.createMangleContext());
692
693 if (MC->shouldMangleDeclName(D: ND)) {
694 SmallString<256> Buffer;
695 llvm::raw_svector_ostream Out(Buffer);
696 GlobalDecl GD;
697 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Val: ND))
698 GD = GlobalDecl(CD, Ctor_Base);
699 else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(Val: ND))
700 GD = GlobalDecl(DD, Dtor_Base);
701 else if (auto FD = dyn_cast<FunctionDecl>(Val: ND)) {
702 GD = FD->isReferenceableKernel() ? GlobalDecl(FD) : GlobalDecl(ND);
703 } else
704 GD = GlobalDecl(ND);
705 MC->mangleName(GD, Out);
706
707 if (!Buffer.empty() && Buffer.front() == '\01')
708 return std::string(Buffer.substr(Start: 1));
709 return std::string(Buffer);
710 }
711 return std::string(ND->getIdentifier()->getName());
712 }
713 return "";
714 }
715 if (isa<BlockDecl>(Val: CurrentDecl)) {
716 // For blocks we only emit something if it is enclosed in a function
717 // For top-level block we'd like to include the name of variable, but we
718 // don't have it at this point.
719 auto DC = CurrentDecl->getDeclContext();
720 if (DC->isFileContext())
721 return "";
722
723 SmallString<256> Buffer;
724 llvm::raw_svector_ostream Out(Buffer);
725 if (auto *DCBlock = dyn_cast<BlockDecl>(Val: DC))
726 // For nested blocks, propagate up to the parent.
727 Out << ComputeName(IK, CurrentDecl: DCBlock);
728 else if (auto *DCDecl = dyn_cast<Decl>(Val: DC))
729 Out << ComputeName(IK, CurrentDecl: DCDecl) << "_block_invoke";
730 return std::string(Out.str());
731 }
732 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: CurrentDecl)) {
733 const auto &LO = Context.getLangOpts();
734 bool IsFuncOrFunctionInNonMSVCCompatEnv =
735 ((IK == PredefinedIdentKind::Func ||
736 IK == PredefinedIdentKind ::Function) &&
737 !LO.MSVCCompat);
738 bool IsLFunctionInMSVCCommpatEnv =
739 IK == PredefinedIdentKind::LFunction && LO.MSVCCompat;
740 bool IsFuncOrFunctionOrLFunctionOrFuncDName =
741 IK != PredefinedIdentKind::PrettyFunction &&
742 IK != PredefinedIdentKind::PrettyFunctionNoVirtual &&
743 IK != PredefinedIdentKind::FuncSig &&
744 IK != PredefinedIdentKind::LFuncSig;
745 if ((ForceElaboratedPrinting &&
746 (IsFuncOrFunctionInNonMSVCCompatEnv || IsLFunctionInMSVCCommpatEnv)) ||
747 (!ForceElaboratedPrinting && IsFuncOrFunctionOrLFunctionOrFuncDName))
748 return FD->getNameAsString();
749
750 SmallString<256> Name;
751 llvm::raw_svector_ostream Out(Name);
752
753 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
754 if (MD->isVirtual() && IK != PredefinedIdentKind::PrettyFunctionNoVirtual)
755 Out << "virtual ";
756 if (MD->isStatic() && !ForceElaboratedPrinting)
757 Out << "static ";
758 }
759
760 class PrettyCallbacks final : public PrintingCallbacks {
761 public:
762 PrettyCallbacks(const LangOptions &LO) : LO(LO) {}
763 std::string remapPath(StringRef Path) const override {
764 SmallString<128> p(Path);
765 LO.remapPathPrefix(Path&: p);
766 return std::string(p);
767 }
768
769 private:
770 const LangOptions &LO;
771 };
772 PrintingPolicy Policy(Context.getLangOpts());
773 PrettyCallbacks PrettyCB(Context.getLangOpts());
774 Policy.Callbacks = &PrettyCB;
775 if (IK == PredefinedIdentKind::Function && ForceElaboratedPrinting)
776 Policy.SuppressTagKeyword = !LO.MSVCCompat;
777 std::string Proto;
778 llvm::raw_string_ostream POut(Proto);
779
780 const FunctionDecl *Decl = FD;
781 if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
782 Decl = Pattern;
783
784 // Bail out if the type of the function has not been set yet.
785 // This can notably happen in the trailing return type of a lambda
786 // expression.
787 const Type *Ty = Decl->getType().getTypePtrOrNull();
788 if (!Ty)
789 return "";
790
791 const FunctionType *AFT = Ty->getAs<FunctionType>();
792 const FunctionProtoType *FT = nullptr;
793 if (FD->hasWrittenPrototype())
794 FT = dyn_cast<FunctionProtoType>(Val: AFT);
795
796 if (IK == PredefinedIdentKind::FuncSig ||
797 IK == PredefinedIdentKind::LFuncSig) {
798 switch (AFT->getCallConv()) {
799 case CC_C: POut << "__cdecl "; break;
800 case CC_X86StdCall: POut << "__stdcall "; break;
801 case CC_X86FastCall: POut << "__fastcall "; break;
802 case CC_X86ThisCall: POut << "__thiscall "; break;
803 case CC_X86VectorCall: POut << "__vectorcall "; break;
804 case CC_X86RegCall: POut << "__regcall "; break;
805 // Only bother printing the conventions that MSVC knows about.
806 default: break;
807 }
808 }
809
810 FD->printQualifiedName(OS&: POut, Policy);
811
812 if (IK == PredefinedIdentKind::Function) {
813 Out << Proto;
814 return std::string(Name);
815 }
816
817 POut << "(";
818 if (FT) {
819 for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
820 if (i) POut << ", ";
821 POut << Decl->getParamDecl(i)->getType().stream(Policy);
822 }
823
824 if (FT->isVariadic()) {
825 if (FD->getNumParams()) POut << ", ";
826 POut << "...";
827 } else if ((IK == PredefinedIdentKind::FuncSig ||
828 IK == PredefinedIdentKind::LFuncSig ||
829 !Context.getLangOpts().CPlusPlus) &&
830 !Decl->getNumParams()) {
831 POut << "void";
832 }
833 }
834 POut << ")";
835
836 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
837 assert(FT && "We must have a written prototype in this case.");
838 if (FT->isConst())
839 POut << " const";
840 if (FT->isVolatile())
841 POut << " volatile";
842 RefQualifierKind Ref = MD->getRefQualifier();
843 if (Ref == RQ_LValue)
844 POut << " &";
845 else if (Ref == RQ_RValue)
846 POut << " &&";
847 }
848
849 typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
850 SpecsTy Specs;
851 const DeclContext *Ctx = FD->getDeclContext();
852 while (isa_and_nonnull<NamedDecl>(Val: Ctx)) {
853 const ClassTemplateSpecializationDecl *Spec
854 = dyn_cast<ClassTemplateSpecializationDecl>(Val: Ctx);
855 if (Spec && !Spec->isExplicitSpecialization())
856 Specs.push_back(Elt: Spec);
857 Ctx = Ctx->getParent();
858 }
859
860 std::string TemplateParams;
861 llvm::raw_string_ostream TOut(TemplateParams);
862 for (const ClassTemplateSpecializationDecl *D : llvm::reverse(C&: Specs)) {
863 const TemplateParameterList *Params =
864 D->getSpecializedTemplate()->getTemplateParameters();
865 const TemplateArgumentList &Args = D->getTemplateArgs();
866 assert(Params->size() == Args.size());
867 for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
868 StringRef Param = Params->getParam(Idx: i)->getName();
869 if (Param.empty()) continue;
870 TOut << Param << " = ";
871 Args.get(Idx: i).print(Policy, Out&: TOut,
872 IncludeType: TemplateParameterList::shouldIncludeTypeForArgument(
873 Policy, TPL: Params, Idx: i));
874 TOut << ", ";
875 }
876 }
877
878 FunctionTemplateSpecializationInfo *FSI
879 = FD->getTemplateSpecializationInfo();
880 if (FSI && !FSI->isExplicitSpecialization()) {
881 const TemplateParameterList* Params
882 = FSI->getTemplate()->getTemplateParameters();
883 const TemplateArgumentList* Args = FSI->TemplateArguments;
884 assert(Params->size() == Args->size());
885 for (unsigned i = 0, e = Params->size(); i != e; ++i) {
886 StringRef Param = Params->getParam(Idx: i)->getName();
887 if (Param.empty()) continue;
888 TOut << Param << " = ";
889 Args->get(Idx: i).print(Policy, Out&: TOut, /*IncludeType*/ true);
890 TOut << ", ";
891 }
892 }
893
894 if (!TemplateParams.empty()) {
895 // remove the trailing comma and space
896 TemplateParams.resize(n: TemplateParams.size() - 2);
897 POut << " [" << TemplateParams << "]";
898 }
899
900 // Print "auto" for all deduced return types. This includes C++1y return
901 // type deduction and lambdas. For trailing return types resolve the
902 // decltype expression. Otherwise print the real type when this is
903 // not a constructor or destructor.
904 if (isLambdaMethod(DC: FD))
905 Proto = "auto " + Proto;
906 else if (FT && FT->getReturnType()->getAs<DecltypeType>())
907 FT->getReturnType()
908 ->getAs<DecltypeType>()
909 ->getUnderlyingType()
910 .getAsStringInternal(Str&: Proto, Policy);
911 else if (!isa<CXXConstructorDecl>(Val: FD) && !isa<CXXDestructorDecl>(Val: FD))
912 AFT->getReturnType().getAsStringInternal(Str&: Proto, Policy);
913
914 Out << Proto;
915
916 return std::string(Name);
917 }
918 if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(Val: CurrentDecl)) {
919 for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
920 // Skip to its enclosing function or method, but not its enclosing
921 // CapturedDecl.
922 if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
923 const Decl *D = Decl::castFromDeclContext(DC);
924 return ComputeName(IK, CurrentDecl: D);
925 }
926 llvm_unreachable("CapturedDecl not inside a function or method");
927 }
928 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Val: CurrentDecl)) {
929 SmallString<256> Name;
930 llvm::raw_svector_ostream Out(Name);
931 Out << (MD->isInstanceMethod() ? '-' : '+');
932 Out << '[';
933
934 // For incorrect code, there might not be an ObjCInterfaceDecl. Do
935 // a null check to avoid a crash.
936 if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
937 Out << *ID;
938
939 if (const ObjCCategoryImplDecl *CID =
940 dyn_cast<ObjCCategoryImplDecl>(Val: MD->getDeclContext()))
941 Out << '(' << *CID << ')';
942
943 Out << ' ';
944 MD->getSelector().print(OS&: Out);
945 Out << ']';
946
947 return std::string(Name);
948 }
949 if (isa<TranslationUnitDecl>(Val: CurrentDecl) &&
950 IK == PredefinedIdentKind::PrettyFunction) {
951 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
952 return "top level";
953 }
954 return "";
955}
956
957void APNumericStorage::setIntValue(const ASTContext &C,
958 const llvm::APInt &Val) {
959 if (hasAllocation())
960 C.Deallocate(Ptr: pVal);
961
962 BitWidth = Val.getBitWidth();
963 unsigned NumWords = Val.getNumWords();
964 const uint64_t* Words = Val.getRawData();
965 if (NumWords > 1) {
966 pVal = new (C) uint64_t[NumWords];
967 std::copy(first: Words, last: Words + NumWords, result: pVal);
968 } else if (NumWords == 1)
969 VAL = Words[0];
970 else
971 VAL = 0;
972}
973
974IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
975 QualType type, SourceLocation l)
976 : Expr(IntegerLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l) {
977 assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
978 assert(V.getBitWidth() == C.getIntWidth(type) &&
979 "Integer type is not the correct size for constant.");
980 setValue(C, Val: V);
981 setDependence(ExprDependence::None);
982}
983
984IntegerLiteral *
985IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
986 QualType type, SourceLocation l) {
987 return new (C) IntegerLiteral(C, V, type, l);
988}
989
990IntegerLiteral *
991IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
992 return new (C) IntegerLiteral(Empty);
993}
994
995FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
996 QualType type, SourceLocation l,
997 unsigned Scale)
998 : Expr(FixedPointLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l),
999 Scale(Scale) {
1000 assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral");
1001 assert(V.getBitWidth() == C.getTypeInfo(type).Width &&
1002 "Fixed point type is not the correct size for constant.");
1003 setValue(C, Val: V);
1004 setDependence(ExprDependence::None);
1005}
1006
1007FixedPointLiteral *FixedPointLiteral::CreateFromRawInt(const ASTContext &C,
1008 const llvm::APInt &V,
1009 QualType type,
1010 SourceLocation l,
1011 unsigned Scale) {
1012 return new (C) FixedPointLiteral(C, V, type, l, Scale);
1013}
1014
1015FixedPointLiteral *FixedPointLiteral::Create(const ASTContext &C,
1016 EmptyShell Empty) {
1017 return new (C) FixedPointLiteral(Empty);
1018}
1019
1020std::string FixedPointLiteral::getValueAsString(unsigned Radix) const {
1021 // Currently the longest decimal number that can be printed is the max for an
1022 // unsigned long _Accum: 4294967295.99999999976716935634613037109375
1023 // which is 43 characters.
1024 SmallString<64> S;
1025 FixedPointValueToString(
1026 Str&: S, Val: llvm::APSInt::getUnsigned(X: getValue().getZExtValue()), Scale);
1027 return std::string(S);
1028}
1029
1030void CharacterLiteral::print(unsigned Val, CharacterLiteralKind Kind,
1031 raw_ostream &OS) {
1032 switch (Kind) {
1033 case CharacterLiteralKind::Ascii:
1034 break; // no prefix.
1035 case CharacterLiteralKind::Wide:
1036 OS << 'L';
1037 break;
1038 case CharacterLiteralKind::UTF8:
1039 OS << "u8";
1040 break;
1041 case CharacterLiteralKind::UTF16:
1042 OS << 'u';
1043 break;
1044 case CharacterLiteralKind::UTF32:
1045 OS << 'U';
1046 break;
1047 }
1048
1049 StringRef Escaped = escapeCStyle<EscapeChar::Single>(Ch: Val);
1050 if (!Escaped.empty()) {
1051 OS << "'" << Escaped << "'";
1052 } else {
1053 // A character literal might be sign-extended, which
1054 // would result in an invalid \U escape sequence.
1055 // FIXME: multicharacter literals such as '\xFF\xFF\xFF\xFF'
1056 // are not correctly handled.
1057 if ((Val & ~0xFFu) == ~0xFFu && Kind == CharacterLiteralKind::Ascii)
1058 Val &= 0xFFu;
1059 if (Val < 256 && isPrintable(c: (unsigned char)Val))
1060 OS << "'" << (char)Val << "'";
1061 else if (Val < 256)
1062 OS << "'\\x" << llvm::format(Fmt: "%02x", Vals: Val) << "'";
1063 else if (Val <= 0xFFFF)
1064 OS << "'\\u" << llvm::format(Fmt: "%04x", Vals: Val) << "'";
1065 else
1066 OS << "'\\U" << llvm::format(Fmt: "%08x", Vals: Val) << "'";
1067 }
1068}
1069
1070FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
1071 bool isexact, QualType Type, SourceLocation L)
1072 : Expr(FloatingLiteralClass, Type, VK_PRValue, OK_Ordinary), Loc(L) {
1073 setSemantics(V.getSemantics());
1074 FloatingLiteralBits.IsExact = isexact;
1075 setValue(C, Val: V);
1076 setDependence(ExprDependence::None);
1077}
1078
1079FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
1080 : Expr(FloatingLiteralClass, Empty) {
1081 setRawSemantics(llvm::APFloatBase::S_IEEEhalf);
1082 FloatingLiteralBits.IsExact = false;
1083}
1084
1085FloatingLiteral *
1086FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
1087 bool isexact, QualType Type, SourceLocation L) {
1088 return new (C) FloatingLiteral(C, V, isexact, Type, L);
1089}
1090
1091FloatingLiteral *
1092FloatingLiteral::Create(const ASTContext &C, EmptyShell Empty) {
1093 return new (C) FloatingLiteral(C, Empty);
1094}
1095
1096/// getValueAsApproximateDouble - This returns the value as an inaccurate
1097/// double. Note that this may cause loss of precision, but is useful for
1098/// debugging dumps, etc.
1099double FloatingLiteral::getValueAsApproximateDouble() const {
1100 llvm::APFloat V = getValue();
1101 bool ignored;
1102 V.convert(ToSemantics: llvm::APFloat::IEEEdouble(), RM: llvm::APFloat::rmNearestTiesToEven,
1103 losesInfo: &ignored);
1104 return V.convertToDouble();
1105}
1106
1107unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
1108 StringLiteralKind SK) {
1109 unsigned CharByteWidth = 0;
1110 switch (SK) {
1111 case StringLiteralKind::Ordinary:
1112 case StringLiteralKind::UTF8:
1113 case StringLiteralKind::Binary:
1114 CharByteWidth = Target.getCharWidth();
1115 break;
1116 case StringLiteralKind::Wide:
1117 CharByteWidth = Target.getWCharWidth();
1118 break;
1119 case StringLiteralKind::UTF16:
1120 CharByteWidth = Target.getChar16Width();
1121 break;
1122 case StringLiteralKind::UTF32:
1123 CharByteWidth = Target.getChar32Width();
1124 break;
1125 case StringLiteralKind::Unevaluated:
1126 return sizeof(char); // Host;
1127 }
1128 assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
1129 CharByteWidth /= 8;
1130 assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&
1131 "The only supported character byte widths are 1,2 and 4!");
1132 return CharByteWidth;
1133}
1134
1135StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
1136 StringLiteralKind Kind, bool Pascal, QualType Ty,
1137 ArrayRef<SourceLocation> Locs)
1138 : Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary) {
1139
1140 unsigned Length = Str.size();
1141
1142 StringLiteralBits.Kind = llvm::to_underlying(E: Kind);
1143 StringLiteralBits.NumConcatenated = Locs.size();
1144
1145 if (Kind != StringLiteralKind::Unevaluated) {
1146 assert(Ctx.getAsConstantArrayType(Ty) &&
1147 "StringLiteral must be of constant array type!");
1148 unsigned CharByteWidth = mapCharByteWidth(Target: Ctx.getTargetInfo(), SK: Kind);
1149 unsigned ByteLength = Str.size();
1150 assert((ByteLength % CharByteWidth == 0) &&
1151 "The size of the data must be a multiple of CharByteWidth!");
1152
1153 // Avoid the expensive division. The compiler should be able to figure it
1154 // out by itself. However as of clang 7, even with the appropriate
1155 // llvm_unreachable added just here, it is not able to do so.
1156 switch (CharByteWidth) {
1157 case 1:
1158 Length = ByteLength;
1159 break;
1160 case 2:
1161 Length = ByteLength / 2;
1162 break;
1163 case 4:
1164 Length = ByteLength / 4;
1165 break;
1166 default:
1167 llvm_unreachable("Unsupported character width!");
1168 }
1169
1170 StringLiteralBits.CharByteWidth = CharByteWidth;
1171 StringLiteralBits.IsPascal = Pascal;
1172 } else {
1173 assert(!Pascal && "Can't make an unevaluated Pascal string");
1174 StringLiteralBits.CharByteWidth = 1;
1175 StringLiteralBits.IsPascal = false;
1176 }
1177
1178 *getTrailingObjects<unsigned>() = Length;
1179
1180 // Initialize the trailing array of SourceLocation.
1181 // This is safe since SourceLocation is POD-like.
1182 llvm::copy(Range&: Locs, Out: getTrailingObjects<SourceLocation>());
1183
1184 // Initialize the trailing array of char holding the string data.
1185 llvm::copy(Range&: Str, Out: getTrailingObjects<char>());
1186
1187 setDependence(ExprDependence::None);
1188}
1189
1190StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
1191 unsigned Length, unsigned CharByteWidth)
1192 : Expr(StringLiteralClass, Empty) {
1193 StringLiteralBits.CharByteWidth = CharByteWidth;
1194 StringLiteralBits.NumConcatenated = NumConcatenated;
1195 *getTrailingObjects<unsigned>() = Length;
1196}
1197
1198StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
1199 StringLiteralKind Kind, bool Pascal,
1200 QualType Ty,
1201 ArrayRef<SourceLocation> Locs) {
1202 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1203 Counts: 1, Counts: Locs.size(), Counts: Str.size()),
1204 Align: alignof(StringLiteral));
1205 return new (Mem) StringLiteral(Ctx, Str, Kind, Pascal, Ty, Locs);
1206}
1207
1208StringLiteral *StringLiteral::CreateEmpty(const ASTContext &Ctx,
1209 unsigned NumConcatenated,
1210 unsigned Length,
1211 unsigned CharByteWidth) {
1212 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1213 Counts: 1, Counts: NumConcatenated, Counts: Length * CharByteWidth),
1214 Align: alignof(StringLiteral));
1215 return new (Mem)
1216 StringLiteral(EmptyShell(), NumConcatenated, Length, CharByteWidth);
1217}
1218
1219void StringLiteral::outputString(raw_ostream &OS) const {
1220 switch (getKind()) {
1221 case StringLiteralKind::Unevaluated:
1222 case StringLiteralKind::Ordinary:
1223 case StringLiteralKind::Binary:
1224 break; // no prefix.
1225 case StringLiteralKind::Wide:
1226 OS << 'L';
1227 break;
1228 case StringLiteralKind::UTF8:
1229 OS << "u8";
1230 break;
1231 case StringLiteralKind::UTF16:
1232 OS << 'u';
1233 break;
1234 case StringLiteralKind::UTF32:
1235 OS << 'U';
1236 break;
1237 }
1238 OS << '"';
1239 static const char Hex[] = "0123456789ABCDEF";
1240
1241 unsigned LastSlashX = getLength();
1242 for (unsigned I = 0, N = getLength(); I != N; ++I) {
1243 uint32_t Char = getCodeUnit(I);
1244 StringRef Escaped = escapeCStyle<EscapeChar::Double>(Ch: Char);
1245 if (Escaped.empty()) {
1246 // FIXME: Convert UTF-8 back to codepoints before rendering.
1247
1248 // Convert UTF-16 surrogate pairs back to codepoints before rendering.
1249 // Leave invalid surrogates alone; we'll use \x for those.
1250 if (getKind() == StringLiteralKind::UTF16 && I != N - 1 &&
1251 Char >= 0xd800 && Char <= 0xdbff) {
1252 uint32_t Trail = getCodeUnit(I: I + 1);
1253 if (Trail >= 0xdc00 && Trail <= 0xdfff) {
1254 Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
1255 ++I;
1256 }
1257 }
1258
1259 if (Char > 0xff) {
1260 // If this is a wide string, output characters over 0xff using \x
1261 // escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
1262 // codepoint: use \x escapes for invalid codepoints.
1263 if (getKind() == StringLiteralKind::Wide ||
1264 (Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
1265 // FIXME: Is this the best way to print wchar_t?
1266 OS << "\\x";
1267 int Shift = 28;
1268 while ((Char >> Shift) == 0)
1269 Shift -= 4;
1270 for (/**/; Shift >= 0; Shift -= 4)
1271 OS << Hex[(Char >> Shift) & 15];
1272 LastSlashX = I;
1273 continue;
1274 }
1275
1276 if (Char > 0xffff)
1277 OS << "\\U00"
1278 << Hex[(Char >> 20) & 15]
1279 << Hex[(Char >> 16) & 15];
1280 else
1281 OS << "\\u";
1282 OS << Hex[(Char >> 12) & 15]
1283 << Hex[(Char >> 8) & 15]
1284 << Hex[(Char >> 4) & 15]
1285 << Hex[(Char >> 0) & 15];
1286 continue;
1287 }
1288
1289 // If we used \x... for the previous character, and this character is a
1290 // hexadecimal digit, prevent it being slurped as part of the \x.
1291 if (LastSlashX + 1 == I) {
1292 switch (Char) {
1293 case '0': case '1': case '2': case '3': case '4':
1294 case '5': case '6': case '7': case '8': case '9':
1295 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
1296 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
1297 OS << "\"\"";
1298 }
1299 }
1300
1301 assert(Char <= 0xff &&
1302 "Characters above 0xff should already have been handled.");
1303
1304 if (isPrintable(c: Char))
1305 OS << (char)Char;
1306 else // Output anything hard as an octal escape.
1307 OS << '\\'
1308 << (char)('0' + ((Char >> 6) & 7))
1309 << (char)('0' + ((Char >> 3) & 7))
1310 << (char)('0' + ((Char >> 0) & 7));
1311 } else {
1312 // Handle some common non-printable cases to make dumps prettier.
1313 OS << Escaped;
1314 }
1315 }
1316 OS << '"';
1317}
1318
1319/// getLocationOfByte - Return a source location that points to the specified
1320/// byte of this string literal.
1321///
1322/// Strings are amazingly complex. They can be formed from multiple tokens and
1323/// can have escape sequences in them in addition to the usual trigraph and
1324/// escaped newline business. This routine handles this complexity.
1325///
1326/// The *StartToken sets the first token to be searched in this function and
1327/// the *StartTokenByteOffset is the byte offset of the first token. Before
1328/// returning, it updates the *StartToken to the TokNo of the token being found
1329/// and sets *StartTokenByteOffset to the byte offset of the token in the
1330/// string.
1331/// Using these two parameters can reduce the time complexity from O(n^2) to
1332/// O(n) if one wants to get the location of byte for all the tokens in a
1333/// string.
1334///
1335SourceLocation
1336StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1337 const LangOptions &Features,
1338 const TargetInfo &Target, unsigned *StartToken,
1339 unsigned *StartTokenByteOffset) const {
1340 // No source location of bytes for binary literals since they don't come from
1341 // source.
1342 if (getKind() == StringLiteralKind::Binary)
1343 return getStrTokenLoc(TokNum: 0);
1344
1345 assert((getKind() == StringLiteralKind::Ordinary ||
1346 getKind() == StringLiteralKind::UTF8 ||
1347 getKind() == StringLiteralKind::Unevaluated) &&
1348 "Only narrow string literals are currently supported");
1349
1350 // Loop over all of the tokens in this string until we find the one that
1351 // contains the byte we're looking for.
1352 unsigned TokNo = 0;
1353 unsigned StringOffset = 0;
1354 if (StartToken)
1355 TokNo = *StartToken;
1356 if (StartTokenByteOffset) {
1357 StringOffset = *StartTokenByteOffset;
1358 ByteNo -= StringOffset;
1359 }
1360 while (true) {
1361 assert(TokNo < getNumConcatenated() && "Invalid byte number!");
1362 SourceLocation StrTokLoc = getStrTokenLoc(TokNum: TokNo);
1363
1364 // Get the spelling of the string so that we can get the data that makes up
1365 // the string literal, not the identifier for the macro it is potentially
1366 // expanded through.
1367 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(Loc: StrTokLoc);
1368
1369 // Re-lex the token to get its length and original spelling.
1370 FileIDAndOffset LocInfo = SM.getDecomposedLoc(Loc: StrTokSpellingLoc);
1371 bool Invalid = false;
1372 StringRef Buffer = SM.getBufferData(FID: LocInfo.first, Invalid: &Invalid);
1373 if (Invalid) {
1374 if (StartTokenByteOffset != nullptr)
1375 *StartTokenByteOffset = StringOffset;
1376 if (StartToken != nullptr)
1377 *StartToken = TokNo;
1378 return StrTokSpellingLoc;
1379 }
1380
1381 const char *StrData = Buffer.data()+LocInfo.second;
1382
1383 // Create a lexer starting at the beginning of this token.
1384 Lexer TheLexer(SM.getLocForStartOfFile(FID: LocInfo.first), Features,
1385 Buffer.begin(), StrData, Buffer.end());
1386 Token TheTok;
1387 TheLexer.LexFromRawLexer(Result&: TheTok);
1388
1389 // Use the StringLiteralParser to compute the length of the string in bytes.
1390 StringLiteralParser SLP(TheTok, SM, Features, Target);
1391 unsigned TokNumBytes = SLP.GetStringLength();
1392
1393 // If the byte is in this token, return the location of the byte.
1394 if (ByteNo < TokNumBytes ||
1395 (ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
1396 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
1397
1398 // Now that we know the offset of the token in the spelling, use the
1399 // preprocessor to get the offset in the original source.
1400 if (StartTokenByteOffset != nullptr)
1401 *StartTokenByteOffset = StringOffset;
1402 if (StartToken != nullptr)
1403 *StartToken = TokNo;
1404 return Lexer::AdvanceToTokenCharacter(TokStart: StrTokLoc, Characters: Offset, SM, LangOpts: Features);
1405 }
1406
1407 // Move to the next string token.
1408 StringOffset += TokNumBytes;
1409 ++TokNo;
1410 ByteNo -= TokNumBytes;
1411 }
1412}
1413
1414UnsignedOrNone StringLiteral::findZeroCodeUnit(unsigned StartIndex) const {
1415 unsigned Length = getLength();
1416 if (StartIndex > Length)
1417 return std::nullopt;
1418
1419 if (getCharByteWidth() == 1) {
1420 StringRef::size_type Pos = getString().substr(Start: StartIndex).find(C: '\0');
1421 if (Pos == StringRef::npos)
1422 return Length - StartIndex;
1423 return Pos;
1424 }
1425
1426 unsigned Result = 0;
1427 for (unsigned I = StartIndex; I != Length; ++I) {
1428 if (getCodeUnit(I) == 0)
1429 break;
1430 ++Result;
1431 }
1432
1433 return Result;
1434}
1435
1436/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1437/// corresponds to, e.g. "sizeof" or "[pre]++".
1438StringRef UnaryOperator::getOpcodeStr(Opcode Op) {
1439 switch (Op) {
1440#define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1441#include "clang/AST/OperationKinds.def"
1442 }
1443 llvm_unreachable("Unknown unary operator");
1444}
1445
1446UnaryOperatorKind
1447UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
1448 switch (OO) {
1449 default: llvm_unreachable("No unary operator for overloaded function");
1450 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
1451 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
1452 case OO_Amp: return UO_AddrOf;
1453 case OO_Star: return UO_Deref;
1454 case OO_Plus: return UO_Plus;
1455 case OO_Minus: return UO_Minus;
1456 case OO_Tilde: return UO_Not;
1457 case OO_Exclaim: return UO_LNot;
1458 case OO_Coawait: return UO_Coawait;
1459 }
1460}
1461
1462OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
1463 switch (Opc) {
1464 case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
1465 case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
1466 case UO_AddrOf: return OO_Amp;
1467 case UO_Deref: return OO_Star;
1468 case UO_Plus: return OO_Plus;
1469 case UO_Minus: return OO_Minus;
1470 case UO_Not: return OO_Tilde;
1471 case UO_LNot: return OO_Exclaim;
1472 case UO_Coawait: return OO_Coawait;
1473 default: return OO_None;
1474 }
1475}
1476
1477
1478//===----------------------------------------------------------------------===//
1479// Postfix Operators.
1480//===----------------------------------------------------------------------===//
1481#ifndef NDEBUG
1482static unsigned SizeOfCallExprInstance(Expr::StmtClass SC) {
1483 switch (SC) {
1484 case Expr::CallExprClass:
1485 return sizeof(CallExpr);
1486 case Expr::CXXOperatorCallExprClass:
1487 return sizeof(CXXOperatorCallExpr);
1488 case Expr::CXXMemberCallExprClass:
1489 return sizeof(CXXMemberCallExpr);
1490 case Expr::UserDefinedLiteralClass:
1491 return sizeof(UserDefinedLiteral);
1492 case Expr::CUDAKernelCallExprClass:
1493 return sizeof(CUDAKernelCallExpr);
1494 default:
1495 llvm_unreachable("unexpected class deriving from CallExpr!");
1496 }
1497}
1498#endif
1499
1500// changing the size of SourceLocation, CallExpr, and
1501// subclasses requires careful considerations
1502static_assert(sizeof(SourceLocation) == 4 && sizeof(CXXOperatorCallExpr) <= 32,
1503 "we assume CXXOperatorCallExpr is at most 32 bytes");
1504
1505CallExpr::CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
1506 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1507 SourceLocation RParenLoc, FPOptionsOverride FPFeatures,
1508 unsigned MinNumArgs, ADLCallKind UsesADL)
1509 : Expr(SC, Ty, VK, OK_Ordinary), RParenLoc(RParenLoc) {
1510 NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1511 unsigned NumPreArgs = PreArgs.size();
1512 CallExprBits.NumPreArgs = NumPreArgs;
1513 assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1514 assert(SizeOfCallExprInstance(SC) <= OffsetToTrailingObjects &&
1515 "This CallExpr subclass is too big or unsupported");
1516
1517 CallExprBits.UsesADL = static_cast<bool>(UsesADL);
1518
1519 setCallee(Fn);
1520 for (unsigned I = 0; I != NumPreArgs; ++I)
1521 setPreArg(I, PreArg: PreArgs[I]);
1522 for (unsigned I = 0; I != Args.size(); ++I)
1523 setArg(Arg: I, ArgExpr: Args[I]);
1524 for (unsigned I = Args.size(); I != NumArgs; ++I)
1525 setArg(Arg: I, ArgExpr: nullptr);
1526
1527 this->computeDependence();
1528
1529 CallExprBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
1530 CallExprBits.IsCoroElideSafe = false;
1531 CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1532 CallExprBits.HasTrailingSourceLoc = false;
1533
1534 if (hasStoredFPFeatures())
1535 setStoredFPFeatures(FPFeatures);
1536}
1537
1538CallExpr::CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
1539 bool HasFPFeatures, EmptyShell Empty)
1540 : Expr(SC, Empty), NumArgs(NumArgs) {
1541 CallExprBits.NumPreArgs = NumPreArgs;
1542 assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1543 CallExprBits.HasFPFeatures = HasFPFeatures;
1544 CallExprBits.IsCoroElideSafe = false;
1545 CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1546 CallExprBits.HasTrailingSourceLoc = false;
1547}
1548
1549CallExpr *CallExpr::Create(const ASTContext &Ctx, Expr *Fn,
1550 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1551 SourceLocation RParenLoc,
1552 FPOptionsOverride FPFeatures, unsigned MinNumArgs,
1553 ADLCallKind UsesADL) {
1554 unsigned NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1555 unsigned SizeOfTrailingObjects = CallExpr::sizeOfTrailingObjects(
1556 /*NumPreArgs=*/0, NumArgs, HasFPFeatures: FPFeatures.requiresTrailingStorage());
1557 void *Mem = Ctx.Allocate(
1558 Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1559 Align: alignof(CallExpr));
1560 CallExpr *E =
1561 new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
1562 RParenLoc, FPFeatures, MinNumArgs, UsesADL);
1563 E->updateTrailingSourceLoc();
1564 return E;
1565}
1566
1567CallExpr *CallExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
1568 bool HasFPFeatures, EmptyShell Empty) {
1569 unsigned SizeOfTrailingObjects =
1570 CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs, HasFPFeatures);
1571 void *Mem = Ctx.Allocate(
1572 Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1573 Align: alignof(CallExpr));
1574 return new (Mem)
1575 CallExpr(CallExprClass, /*NumPreArgs=*/0, NumArgs, HasFPFeatures, Empty);
1576}
1577
1578Decl *Expr::getReferencedDeclOfCallee() {
1579
1580 // Optimize for the common case first
1581 // (simple function or member function call)
1582 // then try more exotic possibilities.
1583 Expr *CEE = IgnoreImpCasts();
1584
1585 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1586 return DRE->getDecl();
1587
1588 if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1589 return ME->getMemberDecl();
1590
1591 CEE = CEE->IgnoreParens();
1592
1593 while (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: CEE))
1594 CEE = NTTP->getReplacement()->IgnoreParenImpCasts();
1595
1596 // If we're calling a dereference, look at the pointer instead.
1597 while (true) {
1598 if (auto *BO = dyn_cast<BinaryOperator>(Val: CEE)) {
1599 if (BO->isPtrMemOp()) {
1600 CEE = BO->getRHS()->IgnoreParenImpCasts();
1601 continue;
1602 }
1603 } else if (auto *UO = dyn_cast<UnaryOperator>(Val: CEE)) {
1604 if (UO->getOpcode() == UO_Deref || UO->getOpcode() == UO_AddrOf ||
1605 UO->getOpcode() == UO_Plus) {
1606 CEE = UO->getSubExpr()->IgnoreParenImpCasts();
1607 continue;
1608 }
1609 }
1610 break;
1611 }
1612
1613 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1614 return DRE->getDecl();
1615 if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1616 return ME->getMemberDecl();
1617 if (auto *BE = dyn_cast<BlockExpr>(Val: CEE))
1618 return BE->getBlockDecl();
1619
1620 return nullptr;
1621}
1622
1623/// If this is a call to a builtin, return the builtin ID. If not, return 0.
1624unsigned CallExpr::getBuiltinCallee() const {
1625 const auto *FDecl = getDirectCallee();
1626 return FDecl ? FDecl->getBuiltinID() : 0;
1627}
1628
1629bool CallExpr::isUnevaluatedBuiltinCall(const ASTContext &Ctx) const {
1630 if (unsigned BI = getBuiltinCallee())
1631 return Ctx.BuiltinInfo.isUnevaluated(ID: BI);
1632 return false;
1633}
1634
1635QualType CallExpr::getCallReturnType(const ASTContext &Ctx) const {
1636 const Expr *Callee = getCallee();
1637 QualType CalleeType = Callee->getType();
1638 if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
1639 CalleeType = FnTypePtr->getPointeeType();
1640 } else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
1641 CalleeType = BPT->getPointeeType();
1642 } else if (CalleeType->isSpecificPlaceholderType(K: BuiltinType::BoundMember)) {
1643 if (isa<CXXPseudoDestructorExpr>(Val: Callee->IgnoreParens()))
1644 return Ctx.VoidTy;
1645
1646 if (isa<UnresolvedMemberExpr>(Val: Callee->IgnoreParens()))
1647 return Ctx.DependentTy;
1648
1649 // This should never be overloaded and so should never return null.
1650 CalleeType = Expr::findBoundMemberType(expr: Callee);
1651 assert(!CalleeType.isNull());
1652 } else if (CalleeType->isRecordType()) {
1653 // If the Callee is a record type, then it is a not-yet-resolved
1654 // dependent call to the call operator of that type.
1655 return Ctx.DependentTy;
1656 } else if (CalleeType->isDependentType() ||
1657 CalleeType->isSpecificPlaceholderType(K: BuiltinType::Overload) ||
1658 CalleeType->isSpecificPlaceholderType(K: BuiltinType::BuiltinFn)) {
1659 // Dependent builtin calls keep their placeholder until instantiation.
1660 return Ctx.DependentTy;
1661 }
1662
1663 if (isTypeDependent() && !CalleeType->isFunctionType())
1664 return Ctx.DependentTy;
1665
1666 const FunctionType *FnType = CalleeType->castAs<FunctionType>();
1667 return FnType->getReturnType();
1668}
1669
1670std::pair<const NamedDecl *, const WarnUnusedResultAttr *>
1671Expr::getUnusedResultAttrImpl(const Decl *Callee, QualType ReturnType) {
1672 // If the callee is marked nodiscard, return that attribute
1673 if (Callee != nullptr)
1674 if (const auto *A = Callee->getAttr<WarnUnusedResultAttr>())
1675 return {nullptr, A};
1676
1677 // If the return type is a struct, union, or enum that is marked nodiscard,
1678 // then return the return type attribute.
1679 if (const TagDecl *TD = ReturnType->getAsTagDecl())
1680 if (const auto *A = TD->getAttr<WarnUnusedResultAttr>())
1681 return {TD, A};
1682
1683 for (const auto *TD = ReturnType->getAs<TypedefType>(); TD;
1684 TD = TD->desugar()->getAs<TypedefType>())
1685 if (const auto *A = TD->getDecl()->getAttr<WarnUnusedResultAttr>())
1686 return {TD->getDecl(), A};
1687 return {nullptr, nullptr};
1688}
1689
1690OffsetOfExpr *OffsetOfExpr::Create(const ASTContext &C, QualType type,
1691 SourceLocation OperatorLoc,
1692 TypeSourceInfo *tsi,
1693 ArrayRef<OffsetOfNode> comps,
1694 ArrayRef<Expr*> exprs,
1695 SourceLocation RParenLoc) {
1696 void *Mem = C.Allocate(
1697 Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: comps.size(), Counts: exprs.size()));
1698
1699 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
1700 RParenLoc);
1701}
1702
1703OffsetOfExpr *OffsetOfExpr::CreateEmpty(const ASTContext &C,
1704 unsigned numComps, unsigned numExprs) {
1705 void *Mem =
1706 C.Allocate(Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: numComps, Counts: numExprs));
1707 return new (Mem) OffsetOfExpr(numComps, numExprs);
1708}
1709
1710OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
1711 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1712 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr *> exprs,
1713 SourceLocation RParenLoc)
1714 : Expr(OffsetOfExprClass, type, VK_PRValue, OK_Ordinary),
1715 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
1716 NumComps(comps.size()), NumExprs(exprs.size()) {
1717 for (unsigned i = 0; i != comps.size(); ++i)
1718 setComponent(Idx: i, ON: comps[i]);
1719 for (unsigned i = 0; i != exprs.size(); ++i)
1720 setIndexExpr(Idx: i, E: exprs[i]);
1721
1722 setDependence(computeDependence(E: this));
1723}
1724
1725const IdentifierInfo *OffsetOfNode::getFieldName() const {
1726 assert(getKind() == Field || getKind() == Identifier);
1727 if (getKind() == Field)
1728 return getField()->getIdentifier();
1729
1730 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1731}
1732
1733UnaryExprOrTypeTraitExpr::UnaryExprOrTypeTraitExpr(
1734 UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
1735 SourceLocation op, SourceLocation rp)
1736 : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_PRValue, OK_Ordinary),
1737 OpLoc(op), RParenLoc(rp) {
1738 assert(ExprKind <= UETT_Last && "invalid enum value!");
1739 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1740 assert(static_cast<unsigned>(ExprKind) == UnaryExprOrTypeTraitExprBits.Kind &&
1741 "UnaryExprOrTypeTraitExprBits.Kind overflow!");
1742 UnaryExprOrTypeTraitExprBits.IsType = false;
1743 Argument.Ex = E;
1744 setDependence(computeDependence(E: this));
1745}
1746
1747MemberExpr::MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1748 NestedNameSpecifierLoc QualifierLoc,
1749 SourceLocation TemplateKWLoc, ValueDecl *MemberDecl,
1750 DeclAccessPair FoundDecl,
1751 const DeclarationNameInfo &NameInfo,
1752 const TemplateArgumentListInfo *TemplateArgs, QualType T,
1753 ExprValueKind VK, ExprObjectKind OK,
1754 NonOdrUseReason NOUR)
1755 : Expr(MemberExprClass, T, VK, OK), Base(Base), MemberDecl(MemberDecl),
1756 MemberDNLoc(NameInfo.getInfo()), MemberLoc(NameInfo.getLoc()) {
1757 assert(!NameInfo.getName() ||
1758 MemberDecl->getDeclName() == NameInfo.getName());
1759 MemberExprBits.IsArrow = IsArrow;
1760 MemberExprBits.HasQualifier = QualifierLoc.hasQualifier();
1761 MemberExprBits.HasFoundDecl =
1762 FoundDecl.getDecl() != MemberDecl ||
1763 FoundDecl.getAccess() != MemberDecl->getAccess();
1764 MemberExprBits.HasTemplateKWAndArgsInfo =
1765 TemplateArgs || TemplateKWLoc.isValid();
1766 MemberExprBits.HadMultipleCandidates = false;
1767 MemberExprBits.NonOdrUseReason = NOUR;
1768 MemberExprBits.OperatorLoc = OperatorLoc;
1769
1770 if (hasQualifier())
1771 new (getTrailingObjects<NestedNameSpecifierLoc>())
1772 NestedNameSpecifierLoc(QualifierLoc);
1773 if (hasFoundDecl())
1774 *getTrailingObjects<DeclAccessPair>() = FoundDecl;
1775 if (TemplateArgs) {
1776 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1777 TemplateKWLoc, List: *TemplateArgs,
1778 OutArgArray: getTrailingObjects<TemplateArgumentLoc>());
1779 } else if (TemplateKWLoc.isValid()) {
1780 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1781 TemplateKWLoc);
1782 }
1783 setDependence(computeDependence(E: this));
1784}
1785
1786MemberExpr *MemberExpr::Create(
1787 const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1788 NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1789 ValueDecl *MemberDecl, DeclAccessPair FoundDecl,
1790 DeclarationNameInfo NameInfo, const TemplateArgumentListInfo *TemplateArgs,
1791 QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR) {
1792 bool HasQualifier = QualifierLoc.hasQualifier();
1793 bool HasFoundDecl = FoundDecl.getDecl() != MemberDecl ||
1794 FoundDecl.getAccess() != MemberDecl->getAccess();
1795 bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1796 std::size_t Size =
1797 totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1798 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1799 Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1800 Counts: TemplateArgs ? TemplateArgs->size() : 0);
1801
1802 void *Mem = C.Allocate(Size, Align: alignof(MemberExpr));
1803 return new (Mem) MemberExpr(Base, IsArrow, OperatorLoc, QualifierLoc,
1804 TemplateKWLoc, MemberDecl, FoundDecl, NameInfo,
1805 TemplateArgs, T, VK, OK, NOUR);
1806}
1807
1808MemberExpr *MemberExpr::CreateEmpty(const ASTContext &Context,
1809 bool HasQualifier, bool HasFoundDecl,
1810 bool HasTemplateKWAndArgsInfo,
1811 unsigned NumTemplateArgs) {
1812 assert((!NumTemplateArgs || HasTemplateKWAndArgsInfo) &&
1813 "template args but no template arg info?");
1814 std::size_t Size =
1815 totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1816 ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1817 Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1818 Counts: NumTemplateArgs);
1819 void *Mem = Context.Allocate(Size, Align: alignof(MemberExpr));
1820 return new (Mem) MemberExpr(EmptyShell());
1821}
1822
1823void MemberExpr::setMemberDecl(ValueDecl *NewD) {
1824 MemberDecl = NewD;
1825 if (getType()->isUndeducedType())
1826 setType(NewD->getType());
1827 setDependence(computeDependence(E: this));
1828}
1829
1830SourceLocation MemberExpr::getBeginLoc() const {
1831 if (isImplicitAccess()) {
1832 if (hasQualifier())
1833 return getQualifierLoc().getBeginLoc();
1834 return MemberLoc;
1835 }
1836
1837 // FIXME: We don't want this to happen. Rather, we should be able to
1838 // detect all kinds of implicit accesses more cleanly.
1839 SourceLocation BaseStartLoc = getBase()->getBeginLoc();
1840 if (BaseStartLoc.isValid())
1841 return BaseStartLoc;
1842 return MemberLoc;
1843}
1844SourceLocation MemberExpr::getEndLoc() const {
1845 SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
1846 if (hasExplicitTemplateArgs())
1847 EndLoc = getRAngleLoc();
1848 else if (EndLoc.isInvalid())
1849 EndLoc = getBase()->getEndLoc();
1850 return EndLoc;
1851}
1852
1853bool CastExpr::CastConsistency() const {
1854 switch (getCastKind()) {
1855 case CK_DerivedToBase:
1856 case CK_UncheckedDerivedToBase:
1857 case CK_DerivedToBaseMemberPointer:
1858 case CK_BaseToDerived:
1859 case CK_BaseToDerivedMemberPointer:
1860 assert(!path_empty() && "Cast kind should have a base path!");
1861 break;
1862
1863 case CK_CPointerToObjCPointerCast:
1864 assert(getType()->isObjCObjectPointerType());
1865 assert(getSubExpr()->getType()->isPointerType());
1866 goto CheckNoBasePath;
1867
1868 case CK_BlockPointerToObjCPointerCast:
1869 assert(getType()->isObjCObjectPointerType());
1870 assert(getSubExpr()->getType()->isBlockPointerType());
1871 goto CheckNoBasePath;
1872
1873 case CK_ReinterpretMemberPointer:
1874 assert(getType()->isMemberPointerType());
1875 assert(getSubExpr()->getType()->isMemberPointerType());
1876 goto CheckNoBasePath;
1877
1878 case CK_BitCast:
1879 // Arbitrary casts to C pointer types count as bitcasts.
1880 // Otherwise, we should only have block and ObjC pointer casts
1881 // here if they stay within the type kind.
1882 if (!getType()->isPointerType()) {
1883 assert(getType()->isObjCObjectPointerType() ==
1884 getSubExpr()->getType()->isObjCObjectPointerType());
1885 assert(getType()->isBlockPointerType() ==
1886 getSubExpr()->getType()->isBlockPointerType());
1887 }
1888 goto CheckNoBasePath;
1889
1890 case CK_AnyPointerToBlockPointerCast:
1891 assert(getType()->isBlockPointerType());
1892 assert(getSubExpr()->getType()->isAnyPointerType() &&
1893 !getSubExpr()->getType()->isBlockPointerType());
1894 goto CheckNoBasePath;
1895
1896 case CK_CopyAndAutoreleaseBlockObject:
1897 assert(getType()->isBlockPointerType());
1898 assert(getSubExpr()->getType()->isBlockPointerType());
1899 goto CheckNoBasePath;
1900
1901 case CK_FunctionToPointerDecay:
1902 assert(getType()->isPointerType());
1903 assert(getSubExpr()->getType()->isFunctionType());
1904 goto CheckNoBasePath;
1905
1906 case CK_AddressSpaceConversion: {
1907 auto Ty = getType();
1908 auto SETy = getSubExpr()->getType();
1909 assert(getValueKindForType(Ty) == Expr::getValueKindForType(SETy));
1910 if (isPRValue() && !Ty->isDependentType() && !SETy->isDependentType()) {
1911 Ty = Ty->getPointeeType();
1912 SETy = SETy->getPointeeType();
1913 }
1914 assert((Ty->isDependentType() || SETy->isDependentType()) ||
1915 (!Ty.isNull() && !SETy.isNull() &&
1916 Ty.getAddressSpace() != SETy.getAddressSpace()));
1917 goto CheckNoBasePath;
1918 }
1919 // These should not have an inheritance path.
1920 case CK_Dynamic:
1921 case CK_ToUnion:
1922 case CK_ArrayToPointerDecay:
1923 case CK_NullToMemberPointer:
1924 case CK_NullToPointer:
1925 case CK_ConstructorConversion:
1926 case CK_IntegralToPointer:
1927 case CK_PointerToIntegral:
1928 case CK_ToVoid:
1929 case CK_VectorSplat:
1930 case CK_IntegralCast:
1931 case CK_BooleanToSignedIntegral:
1932 case CK_IntegralToFloating:
1933 case CK_FloatingToIntegral:
1934 case CK_FloatingCast:
1935 case CK_ObjCObjectLValueCast:
1936 case CK_FloatingRealToComplex:
1937 case CK_FloatingComplexToReal:
1938 case CK_FloatingComplexCast:
1939 case CK_FloatingComplexToIntegralComplex:
1940 case CK_IntegralRealToComplex:
1941 case CK_IntegralComplexToReal:
1942 case CK_IntegralComplexCast:
1943 case CK_IntegralComplexToFloatingComplex:
1944 case CK_ARCProduceObject:
1945 case CK_ARCConsumeObject:
1946 case CK_ARCReclaimReturnedObject:
1947 case CK_ARCExtendBlockObject:
1948 case CK_ZeroToOCLOpaqueType:
1949 case CK_IntToOCLSampler:
1950 case CK_FloatingToFixedPoint:
1951 case CK_FixedPointToFloating:
1952 case CK_FixedPointCast:
1953 case CK_FixedPointToIntegral:
1954 case CK_IntegralToFixedPoint:
1955 case CK_MatrixCast:
1956 assert(!getType()->isBooleanType() && "unheralded conversion to bool");
1957 goto CheckNoBasePath;
1958
1959 case CK_Dependent:
1960 case CK_LValueToRValue:
1961 case CK_NoOp:
1962 case CK_AtomicToNonAtomic:
1963 case CK_NonAtomicToAtomic:
1964 case CK_PointerToBoolean:
1965 case CK_IntegralToBoolean:
1966 case CK_FloatingToBoolean:
1967 case CK_MemberPointerToBoolean:
1968 case CK_FloatingComplexToBoolean:
1969 case CK_IntegralComplexToBoolean:
1970 case CK_LValueBitCast: // -> bool&
1971 case CK_LValueToRValueBitCast:
1972 case CK_UserDefinedConversion: // operator bool()
1973 case CK_BuiltinFnToFnPtr:
1974 case CK_FixedPointToBoolean:
1975 case CK_HLSLArrayRValue:
1976 case CK_HLSLVectorTruncation:
1977 case CK_HLSLMatrixTruncation:
1978 case CK_HLSLElementwiseCast:
1979 case CK_HLSLAggregateSplatCast:
1980 CheckNoBasePath:
1981 assert(path_empty() && "Cast kind should not have a base path!");
1982 break;
1983 }
1984 return true;
1985}
1986
1987const char *CastExpr::getCastKindName(CastKind CK) {
1988 switch (CK) {
1989#define CAST_OPERATION(Name) case CK_##Name: return #Name;
1990#include "clang/AST/OperationKinds.def"
1991 }
1992 llvm_unreachable("Unhandled cast kind!");
1993}
1994
1995namespace {
1996// Skip over implicit nodes produced as part of semantic analysis.
1997// Designed for use with IgnoreExprNodes.
1998static Expr *ignoreImplicitSemaNodes(Expr *E) {
1999 if (auto *Materialize = dyn_cast<MaterializeTemporaryExpr>(Val: E))
2000 return Materialize->getSubExpr();
2001
2002 if (auto *Binder = dyn_cast<CXXBindTemporaryExpr>(Val: E))
2003 return Binder->getSubExpr();
2004
2005 if (auto *Full = dyn_cast<FullExpr>(Val: E))
2006 return Full->getSubExpr();
2007
2008 if (auto *CPLIE = dyn_cast<CXXParenListInitExpr>(Val: E);
2009 CPLIE && CPLIE->getInitExprs().size() == 1)
2010 return CPLIE->getInitExprs()[0];
2011
2012 return E;
2013}
2014} // namespace
2015
2016Expr *CastExpr::getSubExprAsWritten() {
2017 const Expr *SubExpr = nullptr;
2018
2019 for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
2020 SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
2021
2022 // Conversions by constructor and conversion functions have a
2023 // subexpression describing the call; strip it off.
2024 if (E->getCastKind() == CK_ConstructorConversion) {
2025 SubExpr = IgnoreExprNodes(E: cast<CXXConstructExpr>(Val: SubExpr)->getArg(Arg: 0),
2026 Fns&: ignoreImplicitSemaNodes);
2027 } else if (E->getCastKind() == CK_UserDefinedConversion) {
2028 assert((isa<CallExpr, BlockExpr>(SubExpr)) &&
2029 "Unexpected SubExpr for CK_UserDefinedConversion.");
2030 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
2031 SubExpr = MCE->getImplicitObjectArgument();
2032 }
2033 }
2034
2035 return const_cast<Expr *>(SubExpr);
2036}
2037
2038NamedDecl *CastExpr::getConversionFunction() const {
2039 const Expr *SubExpr = nullptr;
2040
2041 for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
2042 SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
2043
2044 if (E->getCastKind() == CK_ConstructorConversion)
2045 return cast<CXXConstructExpr>(Val: SubExpr)->getConstructor();
2046
2047 if (E->getCastKind() == CK_UserDefinedConversion) {
2048 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
2049 return MCE->getMethodDecl();
2050 }
2051 }
2052
2053 return nullptr;
2054}
2055
2056CXXBaseSpecifier **CastExpr::path_buffer() {
2057 switch (getStmtClass()) {
2058#define ABSTRACT_STMT(x)
2059#define CASTEXPR(Type, Base) \
2060 case Stmt::Type##Class: \
2061 return static_cast<Type *>(this) \
2062 ->getTrailingObjectsNonStrict<CXXBaseSpecifier *>();
2063#define STMT(Type, Base)
2064#include "clang/AST/StmtNodes.inc"
2065 default:
2066 llvm_unreachable("non-cast expressions not possible here");
2067 }
2068}
2069
2070const FieldDecl *CastExpr::getTargetFieldForToUnionCast(QualType unionType,
2071 QualType opType) {
2072 return getTargetFieldForToUnionCast(RD: unionType->castAsRecordDecl(), opType);
2073}
2074
2075const FieldDecl *CastExpr::getTargetFieldForToUnionCast(const RecordDecl *RD,
2076 QualType OpType) {
2077 auto &Ctx = RD->getASTContext();
2078 RecordDecl::field_iterator Field, FieldEnd;
2079 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
2080 Field != FieldEnd; ++Field) {
2081 if (Ctx.hasSameUnqualifiedType(T1: Field->getType(), T2: OpType) &&
2082 !Field->isUnnamedBitField()) {
2083 return *Field;
2084 }
2085 }
2086 return nullptr;
2087}
2088
2089FPOptionsOverride *CastExpr::getTrailingFPFeatures() {
2090 assert(hasStoredFPFeatures());
2091 switch (getStmtClass()) {
2092 case ImplicitCastExprClass:
2093 return static_cast<ImplicitCastExpr *>(this)
2094 ->getTrailingObjects<FPOptionsOverride>();
2095 case CStyleCastExprClass:
2096 return static_cast<CStyleCastExpr *>(this)
2097 ->getTrailingObjects<FPOptionsOverride>();
2098 case CXXFunctionalCastExprClass:
2099 return static_cast<CXXFunctionalCastExpr *>(this)
2100 ->getTrailingObjects<FPOptionsOverride>();
2101 case CXXStaticCastExprClass:
2102 return static_cast<CXXStaticCastExpr *>(this)
2103 ->getTrailingObjects<FPOptionsOverride>();
2104 default:
2105 llvm_unreachable("Cast does not have FPFeatures");
2106 }
2107}
2108
2109ImplicitCastExpr *ImplicitCastExpr::Create(const ASTContext &C, QualType T,
2110 CastKind Kind, Expr *Operand,
2111 const CXXCastPath *BasePath,
2112 ExprValueKind VK,
2113 FPOptionsOverride FPO) {
2114 unsigned PathSize = (BasePath ? BasePath->size() : 0);
2115 void *Buffer =
2116 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2117 Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2118 // Per C++ [conv.lval]p3, lvalue-to-rvalue conversions on class and
2119 // std::nullptr_t have special semantics not captured by CK_LValueToRValue.
2120 assert((Kind != CK_LValueToRValue ||
2121 !(T->isNullPtrType() ||
2122 (T->getAsCXXRecordDecl() && !C.getLangOpts().HLSL))) &&
2123 "invalid type for lvalue-to-rvalue conversion");
2124 ImplicitCastExpr *E =
2125 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, FPO, VK);
2126 if (PathSize)
2127 llvm::uninitialized_copy(Src: *BasePath,
2128 Dst: E->getTrailingObjects<CXXBaseSpecifier *>());
2129 return E;
2130}
2131
2132ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(const ASTContext &C,
2133 unsigned PathSize,
2134 bool HasFPFeatures) {
2135 void *Buffer =
2136 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2137 Counts: PathSize, Counts: HasFPFeatures));
2138 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2139}
2140
2141CStyleCastExpr *CStyleCastExpr::Create(const ASTContext &C, QualType T,
2142 ExprValueKind VK, CastKind K, Expr *Op,
2143 const CXXCastPath *BasePath,
2144 FPOptionsOverride FPO,
2145 TypeSourceInfo *WrittenTy,
2146 SourceLocation L, SourceLocation R) {
2147 unsigned PathSize = (BasePath ? BasePath->size() : 0);
2148 void *Buffer =
2149 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2150 Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2151 CStyleCastExpr *E =
2152 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, FPO, WrittenTy, L, R);
2153 if (PathSize)
2154 llvm::uninitialized_copy(Src: *BasePath,
2155 Dst: E->getTrailingObjects<CXXBaseSpecifier *>());
2156 return E;
2157}
2158
2159CStyleCastExpr *CStyleCastExpr::CreateEmpty(const ASTContext &C,
2160 unsigned PathSize,
2161 bool HasFPFeatures) {
2162 void *Buffer =
2163 C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2164 Counts: PathSize, Counts: HasFPFeatures));
2165 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2166}
2167
2168/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2169/// corresponds to, e.g. "<<=".
2170StringRef BinaryOperator::getOpcodeStr(Opcode Op) {
2171 switch (Op) {
2172#define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
2173#include "clang/AST/OperationKinds.def"
2174 }
2175 llvm_unreachable("Invalid OpCode!");
2176}
2177
2178BinaryOperatorKind
2179BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
2180 switch (OO) {
2181 default: llvm_unreachable("Not an overloadable binary operator");
2182 case OO_Plus: return BO_Add;
2183 case OO_Minus: return BO_Sub;
2184 case OO_Star: return BO_Mul;
2185 case OO_Slash: return BO_Div;
2186 case OO_Percent: return BO_Rem;
2187 case OO_Caret: return BO_Xor;
2188 case OO_Amp: return BO_And;
2189 case OO_Pipe: return BO_Or;
2190 case OO_Equal: return BO_Assign;
2191 case OO_Spaceship: return BO_Cmp;
2192 case OO_Less: return BO_LT;
2193 case OO_Greater: return BO_GT;
2194 case OO_PlusEqual: return BO_AddAssign;
2195 case OO_MinusEqual: return BO_SubAssign;
2196 case OO_StarEqual: return BO_MulAssign;
2197 case OO_SlashEqual: return BO_DivAssign;
2198 case OO_PercentEqual: return BO_RemAssign;
2199 case OO_CaretEqual: return BO_XorAssign;
2200 case OO_AmpEqual: return BO_AndAssign;
2201 case OO_PipeEqual: return BO_OrAssign;
2202 case OO_LessLess: return BO_Shl;
2203 case OO_GreaterGreater: return BO_Shr;
2204 case OO_LessLessEqual: return BO_ShlAssign;
2205 case OO_GreaterGreaterEqual: return BO_ShrAssign;
2206 case OO_EqualEqual: return BO_EQ;
2207 case OO_ExclaimEqual: return BO_NE;
2208 case OO_LessEqual: return BO_LE;
2209 case OO_GreaterEqual: return BO_GE;
2210 case OO_AmpAmp: return BO_LAnd;
2211 case OO_PipePipe: return BO_LOr;
2212 case OO_Comma: return BO_Comma;
2213 case OO_ArrowStar: return BO_PtrMemI;
2214 }
2215}
2216
2217OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
2218 static const OverloadedOperatorKind OverOps[] = {
2219 /* .* Cannot be overloaded */OO_None, OO_ArrowStar,
2220 OO_Star, OO_Slash, OO_Percent,
2221 OO_Plus, OO_Minus,
2222 OO_LessLess, OO_GreaterGreater,
2223 OO_Spaceship,
2224 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
2225 OO_EqualEqual, OO_ExclaimEqual,
2226 OO_Amp,
2227 OO_Caret,
2228 OO_Pipe,
2229 OO_AmpAmp,
2230 OO_PipePipe,
2231 OO_Equal, OO_StarEqual,
2232 OO_SlashEqual, OO_PercentEqual,
2233 OO_PlusEqual, OO_MinusEqual,
2234 OO_LessLessEqual, OO_GreaterGreaterEqual,
2235 OO_AmpEqual, OO_CaretEqual,
2236 OO_PipeEqual,
2237 OO_Comma
2238 };
2239 return OverOps[Opc];
2240}
2241
2242bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
2243 Opcode Opc,
2244 const Expr *LHS,
2245 const Expr *RHS) {
2246 if (Opc != BO_Add)
2247 return false;
2248
2249 // Check that we have one pointer and one integer operand.
2250 const Expr *PExp;
2251 if (LHS->getType()->isPointerType()) {
2252 if (!RHS->getType()->isIntegerType())
2253 return false;
2254 PExp = LHS;
2255 } else if (RHS->getType()->isPointerType()) {
2256 if (!LHS->getType()->isIntegerType())
2257 return false;
2258 PExp = RHS;
2259 } else {
2260 return false;
2261 }
2262
2263 // Workaround for old glibc's __PTR_ALIGN macro
2264 if (auto *Select =
2265 dyn_cast<ConditionalOperator>(Val: PExp->IgnoreParenNoopCasts(Ctx))) {
2266 // If the condition can be constant evaluated, we check the selected arm.
2267 bool EvalResult;
2268 if (!Select->getCond()->EvaluateAsBooleanCondition(Result&: EvalResult, Ctx))
2269 return false;
2270 PExp = EvalResult ? Select->getTrueExpr() : Select->getFalseExpr();
2271 }
2272
2273 // Check that the pointer is a nullptr.
2274 if (!PExp->IgnoreParenCasts()
2275 ->isNullPointerConstant(Ctx, NPC: Expr::NPC_ValueDependentIsNotNull))
2276 return false;
2277
2278 // Check that the pointee type is char-sized.
2279 const PointerType *PTy = PExp->getType()->getAs<PointerType>();
2280 if (!PTy || !PTy->getPointeeType()->isCharType())
2281 return false;
2282
2283 return true;
2284}
2285
2286SourceLocExpr::SourceLocExpr(const ASTContext &Ctx, SourceLocIdentKind Kind,
2287 QualType ResultTy, SourceLocation BLoc,
2288 SourceLocation RParenLoc,
2289 DeclContext *ParentContext)
2290 : Expr(SourceLocExprClass, ResultTy, VK_PRValue, OK_Ordinary),
2291 BuiltinLoc(BLoc), RParenLoc(RParenLoc), ParentContext(ParentContext) {
2292 SourceLocExprBits.Kind = llvm::to_underlying(E: Kind);
2293 // In dependent contexts, function names may change.
2294 setDependence(MayBeDependent(Kind) && ParentContext->isDependentContext()
2295 ? ExprDependence::ValueInstantiation
2296 : ExprDependence::None);
2297}
2298
2299StringRef SourceLocExpr::getBuiltinStr() const {
2300 switch (getIdentKind()) {
2301 case SourceLocIdentKind::File:
2302 return "__builtin_FILE";
2303 case SourceLocIdentKind::FileName:
2304 return "__builtin_FILE_NAME";
2305 case SourceLocIdentKind::Function:
2306 return "__builtin_FUNCTION";
2307 case SourceLocIdentKind::FuncSig:
2308 return "__builtin_FUNCSIG";
2309 case SourceLocIdentKind::Line:
2310 return "__builtin_LINE";
2311 case SourceLocIdentKind::Column:
2312 return "__builtin_COLUMN";
2313 case SourceLocIdentKind::SourceLocStruct:
2314 return "__builtin_source_location";
2315 }
2316 llvm_unreachable("unexpected IdentKind!");
2317}
2318
2319APValue SourceLocExpr::EvaluateInContext(const ASTContext &Ctx,
2320 const Expr *DefaultExpr) const {
2321 SourceLocation Loc;
2322 const DeclContext *Context;
2323
2324 if (const auto *DIE = dyn_cast_if_present<CXXDefaultInitExpr>(Val: DefaultExpr)) {
2325 Loc = DIE->getUsedLocation();
2326 Context = DIE->getUsedContext();
2327 } else if (const auto *DAE =
2328 dyn_cast_if_present<CXXDefaultArgExpr>(Val: DefaultExpr)) {
2329 Loc = DAE->getUsedLocation();
2330 Context = DAE->getUsedContext();
2331 } else {
2332 Loc = getLocation();
2333 Context = getParentContext();
2334 }
2335
2336 // If we are currently parsing a lambda declarator, we might not have a fully
2337 // formed call operator declaration yet, and we could not form a function name
2338 // for it. Because we do not have access to Sema/function scopes here, we
2339 // detect this case by relying on the fact such method doesn't yet have a
2340 // type.
2341 if (const auto *D = dyn_cast<CXXMethodDecl>(Val: Context);
2342 D && D->getFunctionTypeLoc().isNull() && isLambdaCallOperator(MD: D))
2343 Context = D->getParent()->getParent();
2344
2345 PresumedLoc PLoc = Ctx.getSourceManager().getPresumedLoc(
2346 Loc: Ctx.getSourceManager().getExpansionRange(Loc).getEnd());
2347
2348 auto MakeStringLiteral = [&](StringRef Tmp) {
2349 using LValuePathEntry = APValue::LValuePathEntry;
2350 StringLiteral *Res = Ctx.getPredefinedStringLiteralFromCache(Key: Tmp);
2351 // Decay the string to a pointer to the first character.
2352 LValuePathEntry Path[1] = {LValuePathEntry::ArrayIndex(Index: 0)};
2353 return APValue(Res, CharUnits::Zero(), Path, /*OnePastTheEnd=*/false);
2354 };
2355
2356 switch (getIdentKind()) {
2357 case SourceLocIdentKind::FileName: {
2358 // __builtin_FILE_NAME() is a Clang-specific extension that expands to the
2359 // the last part of __builtin_FILE().
2360 SmallString<256> FileName;
2361 clang::Preprocessor::processPathToFileName(
2362 FileName, PLoc, LangOpts: Ctx.getLangOpts(), TI: Ctx.getTargetInfo());
2363 return MakeStringLiteral(FileName);
2364 }
2365 case SourceLocIdentKind::File: {
2366 SmallString<256> Path(PLoc.getFilename());
2367 clang::Preprocessor::processPathForFileMacro(Path, LangOpts: Ctx.getLangOpts(),
2368 TI: Ctx.getTargetInfo());
2369 return MakeStringLiteral(Path);
2370 }
2371 case SourceLocIdentKind::Function:
2372 case SourceLocIdentKind::FuncSig: {
2373 const auto *CurDecl = dyn_cast<Decl>(Val: Context);
2374 const auto Kind = getIdentKind() == SourceLocIdentKind::Function
2375 ? PredefinedIdentKind::Function
2376 : PredefinedIdentKind::FuncSig;
2377 return MakeStringLiteral(
2378 CurDecl ? PredefinedExpr::ComputeName(IK: Kind, CurrentDecl: CurDecl) : std::string(""));
2379 }
2380 case SourceLocIdentKind::Line:
2381 return APValue(Ctx.MakeIntValue(Value: PLoc.getLine(), Type: Ctx.UnsignedIntTy));
2382 case SourceLocIdentKind::Column:
2383 return APValue(Ctx.MakeIntValue(Value: PLoc.getColumn(), Type: Ctx.UnsignedIntTy));
2384 case SourceLocIdentKind::SourceLocStruct: {
2385 // Fill in a std::source_location::__impl structure, by creating an
2386 // artificial file-scoped CompoundLiteralExpr, and returning a pointer to
2387 // that.
2388 const CXXRecordDecl *ImplDecl = getType()->getPointeeCXXRecordDecl();
2389 assert(ImplDecl);
2390
2391 // Construct an APValue for the __impl struct, and get or create a Decl
2392 // corresponding to that. Note that we've already verified that the shape of
2393 // the ImplDecl type is as expected.
2394
2395 APValue Value(APValue::UninitStruct(), 0, 4);
2396 for (const FieldDecl *F : ImplDecl->fields()) {
2397 StringRef Name = F->getName();
2398 if (Name == "_M_file_name") {
2399 SmallString<256> Path(PLoc.getFilename());
2400 clang::Preprocessor::processPathForFileMacro(Path, LangOpts: Ctx.getLangOpts(),
2401 TI: Ctx.getTargetInfo());
2402 Value.getStructField(i: F->getFieldIndex()) = MakeStringLiteral(Path);
2403 } else if (Name == "_M_function_name") {
2404 // Note: this emits the PrettyFunction name -- different than what
2405 // __builtin_FUNCTION() above returns!
2406 const auto *CurDecl = dyn_cast<Decl>(Val: Context);
2407 Value.getStructField(i: F->getFieldIndex()) = MakeStringLiteral(
2408 CurDecl && !isa<TranslationUnitDecl>(Val: CurDecl)
2409 ? StringRef(PredefinedExpr::ComputeName(
2410 IK: PredefinedIdentKind::PrettyFunction, CurrentDecl: CurDecl))
2411 : "");
2412 } else if (Name == "_M_line") {
2413 llvm::APSInt IntVal = Ctx.MakeIntValue(Value: PLoc.getLine(), Type: F->getType());
2414 Value.getStructField(i: F->getFieldIndex()) = APValue(IntVal);
2415 } else if (Name == "_M_column") {
2416 llvm::APSInt IntVal = Ctx.MakeIntValue(Value: PLoc.getColumn(), Type: F->getType());
2417 Value.getStructField(i: F->getFieldIndex()) = APValue(IntVal);
2418 }
2419 }
2420
2421 UnnamedGlobalConstantDecl *GV =
2422 Ctx.getUnnamedGlobalConstantDecl(Ty: getType()->getPointeeType(), Value);
2423
2424 return APValue(GV, CharUnits::Zero(), ArrayRef<APValue::LValuePathEntry>{},
2425 false);
2426 }
2427 }
2428 llvm_unreachable("unhandled case");
2429}
2430
2431EmbedExpr::EmbedExpr(const ASTContext &Ctx, SourceLocation Loc,
2432 EmbedDataStorage *Data, unsigned Begin,
2433 unsigned NumOfElements)
2434 : Expr(EmbedExprClass, Ctx.IntTy, VK_PRValue, OK_Ordinary),
2435 EmbedKeywordLoc(Loc), Ctx(&Ctx), Data(Data), Begin(Begin),
2436 NumOfElements(NumOfElements) {
2437 setDependence(ExprDependence::None);
2438 FakeChildNode = IntegerLiteral::Create(
2439 C: Ctx, V: llvm::APInt::getZero(numBits: Ctx.getTypeSize(T: getType())), type: getType(), l: Loc);
2440 assert(getType()->isSignedIntegerType() && "IntTy should be signed");
2441}
2442
2443InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
2444 ArrayRef<Expr *> initExprs, SourceLocation rbraceloc,
2445 bool isExplicit)
2446 : Expr(InitListExprClass, QualType(), VK_PRValue, OK_Ordinary),
2447 InitExprs(C, initExprs.size()), LBraceLoc(lbraceloc),
2448 RBraceLoc(rbraceloc), AltForm(nullptr, true) {
2449 sawArrayRangeDesignator(ARD: false);
2450 InitExprs.insert(C, I: InitExprs.end(), From: initExprs.begin(), To: initExprs.end());
2451 InitListExprBits.IsExplicit = isExplicit;
2452
2453 setDependence(computeDependence(E: this));
2454}
2455
2456void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
2457 if (NumInits > InitExprs.size())
2458 InitExprs.reserve(C, N: NumInits);
2459}
2460
2461void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
2462 InitExprs.resize(C, N: NumInits, NV: nullptr);
2463}
2464
2465Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
2466 if (Init >= InitExprs.size()) {
2467 InitExprs.insert(C, I: InitExprs.end(), NumToInsert: Init - InitExprs.size() + 1, Elt: nullptr);
2468 setInit(Init, expr);
2469 return nullptr;
2470 }
2471
2472 Expr *Result = cast_or_null<Expr>(Val: InitExprs[Init]);
2473 setInit(Init, expr);
2474 return Result;
2475}
2476
2477void InitListExpr::setArrayFiller(Expr *filler) {
2478 assert(!hasArrayFiller() && "Filler already set!");
2479 ArrayFillerOrUnionFieldInit = filler;
2480 // Fill out any "holes" in the array due to designated initializers.
2481 Expr **inits = getInits();
2482 for (unsigned i = 0, e = getNumInits(); i != e; ++i)
2483 if (inits[i] == nullptr)
2484 inits[i] = filler;
2485}
2486
2487bool InitListExpr::isStringLiteralInit() const {
2488 if (getNumInits() != 1)
2489 return false;
2490 const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
2491 if (!AT || !AT->getElementType()->isIntegerType())
2492 return false;
2493 // It is possible for getInit() to return null.
2494 const Expr *Init = getInit(Init: 0);
2495 if (!Init)
2496 return false;
2497 Init = Init->IgnoreParenImpCasts();
2498 return isa<StringLiteral>(Val: Init) || isa<ObjCEncodeExpr>(Val: Init);
2499}
2500
2501bool InitListExpr::isTransparent() const {
2502 assert(isSemanticForm() && "syntactic form never semantically transparent");
2503
2504 // A glvalue InitListExpr is always just sugar.
2505 if (isGLValue()) {
2506 assert(getNumInits() == 1 && "multiple inits in glvalue init list");
2507 return true;
2508 }
2509
2510 // Otherwise, we're sugar if and only if we have exactly one initializer that
2511 // is of the same type.
2512 if (getNumInits() != 1 || !getInit(Init: 0))
2513 return false;
2514
2515 // Don't confuse aggregate initialization of a struct X { X &x; }; with a
2516 // transparent struct copy.
2517 if (!getInit(Init: 0)->isPRValue() && getType()->isRecordType())
2518 return false;
2519
2520 return getType().getCanonicalType() ==
2521 getInit(Init: 0)->getType().getCanonicalType();
2522}
2523
2524bool InitListExpr::isIdiomaticZeroInitializer(const LangOptions &LangOpts) const {
2525 assert(isSyntacticForm() && "only test syntactic form as zero initializer");
2526
2527 if (LangOpts.CPlusPlus || getNumInits() != 1 || !getInit(Init: 0)) {
2528 return false;
2529 }
2530
2531 const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: getInit(Init: 0)->IgnoreImplicit());
2532 return Lit && Lit->getValue() == 0;
2533}
2534
2535SourceLocation InitListExpr::getBeginLoc() const {
2536 if (InitListExpr *SyntacticForm = getSyntacticForm())
2537 return SyntacticForm->getBeginLoc();
2538 SourceLocation Beg = LBraceLoc;
2539 if (Beg.isInvalid()) {
2540 // Find the first non-null initializer.
2541 for (InitExprsTy::const_iterator I = InitExprs.begin(),
2542 E = InitExprs.end();
2543 I != E; ++I) {
2544 if (Stmt *S = *I) {
2545 Beg = S->getBeginLoc();
2546 break;
2547 }
2548 }
2549 }
2550 return Beg;
2551}
2552
2553SourceLocation InitListExpr::getEndLoc() const {
2554 if (InitListExpr *SyntacticForm = getSyntacticForm())
2555 return SyntacticForm->getEndLoc();
2556 SourceLocation End = RBraceLoc;
2557 if (End.isInvalid()) {
2558 // Find the first non-null initializer from the end.
2559 for (Stmt *S : llvm::reverse(C: InitExprs)) {
2560 if (S) {
2561 End = S->getEndLoc();
2562 break;
2563 }
2564 }
2565 }
2566 return End;
2567}
2568
2569/// getFunctionType - Return the underlying function type for this block.
2570///
2571const FunctionProtoType *BlockExpr::getFunctionType() const {
2572 // The block pointer is never sugared, but the function type might be.
2573 return cast<BlockPointerType>(Val: getType())
2574 ->getPointeeType()->castAs<FunctionProtoType>();
2575}
2576
2577SourceLocation BlockExpr::getCaretLocation() const {
2578 return TheBlock->getCaretLocation();
2579}
2580const Stmt *BlockExpr::getBody() const {
2581 return TheBlock->getBody();
2582}
2583Stmt *BlockExpr::getBody() {
2584 return TheBlock->getBody();
2585}
2586
2587
2588//===----------------------------------------------------------------------===//
2589// Generic Expression Routines
2590//===----------------------------------------------------------------------===//
2591
2592/// Helper to determine wether \c E is a CXXConstructExpr constructing
2593/// a DecompositionDecl. Used to skip Clang-generated calls to std::get
2594/// for structured bindings.
2595static bool IsDecompositionDeclRefExpr(const Expr *E) {
2596 const auto *Unwrapped = E->IgnoreUnlessSpelledInSource();
2597 const auto *Ref = dyn_cast<DeclRefExpr>(Val: Unwrapped);
2598 if (!Ref)
2599 return false;
2600
2601 return isa_and_nonnull<DecompositionDecl>(Val: Ref->getDecl());
2602}
2603
2604bool Expr::isReadIfDiscardedInCPlusPlus11() const {
2605 // In C++11, discarded-value expressions of a certain form are special,
2606 // according to [expr]p10:
2607 // The lvalue-to-rvalue conversion (4.1) is applied only if the
2608 // expression is a glvalue of volatile-qualified type and it has
2609 // one of the following forms:
2610 if (!isGLValue() || !getType().isVolatileQualified())
2611 return false;
2612
2613 const Expr *E = IgnoreParens();
2614
2615 // - id-expression (5.1.1),
2616 if (isa<DeclRefExpr>(Val: E))
2617 return true;
2618
2619 // - subscripting (5.2.1),
2620 if (isa<ArraySubscriptExpr>(Val: E))
2621 return true;
2622
2623 // - class member access (5.2.5),
2624 if (isa<MemberExpr>(Val: E))
2625 return true;
2626
2627 // - indirection (5.3.1),
2628 if (auto *UO = dyn_cast<UnaryOperator>(Val: E))
2629 if (UO->getOpcode() == UO_Deref)
2630 return true;
2631
2632 if (auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
2633 // - pointer-to-member operation (5.5),
2634 if (BO->isPtrMemOp())
2635 return true;
2636
2637 // - comma expression (5.18) where the right operand is one of the above.
2638 if (BO->getOpcode() == BO_Comma)
2639 return BO->getRHS()->isReadIfDiscardedInCPlusPlus11();
2640 }
2641
2642 // - conditional expression (5.16) where both the second and the third
2643 // operands are one of the above, or
2644 if (auto *CO = dyn_cast<ConditionalOperator>(Val: E))
2645 return CO->getTrueExpr()->isReadIfDiscardedInCPlusPlus11() &&
2646 CO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2647 // The related edge case of "*x ?: *x".
2648 if (auto *BCO =
2649 dyn_cast<BinaryConditionalOperator>(Val: E)) {
2650 if (auto *OVE = dyn_cast<OpaqueValueExpr>(Val: BCO->getTrueExpr()))
2651 return OVE->getSourceExpr()->isReadIfDiscardedInCPlusPlus11() &&
2652 BCO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2653 }
2654
2655 // Objective-C++ extensions to the rule.
2656 if (isa<ObjCIvarRefExpr>(Val: E))
2657 return true;
2658 if (const auto *POE = dyn_cast<PseudoObjectExpr>(Val: E)) {
2659 if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(Val: POE->getSyntacticForm()))
2660 return true;
2661 }
2662
2663 return false;
2664}
2665
2666/// isUnusedResultAWarning - Return true if this immediate expression should
2667/// be warned about if the result is unused. If so, fill in Loc and Ranges
2668/// with location to warn on and the source range[s] to report with the
2669/// warning.
2670bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
2671 SourceRange &R1, SourceRange &R2,
2672 ASTContext &Ctx) const {
2673 // Don't warn if the expr is type dependent. The type could end up
2674 // instantiating to void.
2675 if (isTypeDependent())
2676 return false;
2677
2678 switch (getStmtClass()) {
2679 default:
2680 if (getType()->isVoidType())
2681 return false;
2682 WarnE = this;
2683 Loc = getExprLoc();
2684 R1 = getSourceRange();
2685 return true;
2686 case ParenExprClass:
2687 return cast<ParenExpr>(Val: this)->getSubExpr()->
2688 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2689 case GenericSelectionExprClass:
2690 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()->
2691 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2692 case CoawaitExprClass:
2693 case CoyieldExprClass:
2694 return cast<CoroutineSuspendExpr>(Val: this)->getResumeExpr()->
2695 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2696 case ChooseExprClass:
2697 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()->
2698 isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2699 case UnaryOperatorClass: {
2700 const UnaryOperator *UO = cast<UnaryOperator>(Val: this);
2701
2702 switch (UO->getOpcode()) {
2703 case UO_Plus:
2704 case UO_Minus:
2705 case UO_AddrOf:
2706 case UO_Not:
2707 case UO_LNot:
2708 case UO_Deref:
2709 break;
2710 case UO_Coawait:
2711 // This is just the 'operator co_await' call inside the guts of a
2712 // dependent co_await call.
2713 case UO_PostInc:
2714 case UO_PostDec:
2715 case UO_PreInc:
2716 case UO_PreDec: // ++/--
2717 return false; // Not a warning.
2718 case UO_Real:
2719 case UO_Imag:
2720 // accessing a piece of a volatile complex is a side-effect.
2721 if (Ctx.getCanonicalType(T: UO->getSubExpr()->getType())
2722 .isVolatileQualified())
2723 return false;
2724 break;
2725 case UO_Extension:
2726 return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2727 }
2728 WarnE = this;
2729 Loc = UO->getOperatorLoc();
2730 R1 = UO->getSubExpr()->getSourceRange();
2731 return true;
2732 }
2733 case BinaryOperatorClass: {
2734 const BinaryOperator *BO = cast<BinaryOperator>(Val: this);
2735 switch (BO->getOpcode()) {
2736 default:
2737 break;
2738 // Consider the RHS of comma for side effects. LHS was checked by
2739 // Sema::CheckCommaOperands.
2740 case BO_Comma:
2741 // ((foo = <blah>), 0) is an idiom for hiding the result (and
2742 // lvalue-ness) of an assignment written in a macro.
2743 if (IntegerLiteral *IE =
2744 dyn_cast<IntegerLiteral>(Val: BO->getRHS()->IgnoreParens()))
2745 if (IE->getValue() == 0)
2746 return false;
2747 return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2748 // Consider '||', '&&' to have side effects if the LHS or RHS does.
2749 case BO_LAnd:
2750 case BO_LOr:
2751 if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
2752 !BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2753 return false;
2754 break;
2755 }
2756 if (BO->isAssignmentOp())
2757 return false;
2758 WarnE = this;
2759 Loc = BO->getOperatorLoc();
2760 R1 = BO->getLHS()->getSourceRange();
2761 R2 = BO->getRHS()->getSourceRange();
2762 return true;
2763 }
2764 case CompoundAssignOperatorClass:
2765 case VAArgExprClass:
2766 case AtomicExprClass:
2767 return false;
2768
2769 case ConditionalOperatorClass: {
2770 // If only one of the LHS or RHS is a warning, the operator might
2771 // be being used for control flow. Only warn if both the LHS and
2772 // RHS are warnings.
2773 const auto *Exp = cast<ConditionalOperator>(Val: this);
2774 return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) &&
2775 Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2776 }
2777 case BinaryConditionalOperatorClass: {
2778 const auto *Exp = cast<BinaryConditionalOperator>(Val: this);
2779 return Exp->getFalseExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2780 }
2781
2782 case MemberExprClass:
2783 WarnE = this;
2784 Loc = cast<MemberExpr>(Val: this)->getMemberLoc();
2785 R1 = SourceRange(Loc, Loc);
2786 R2 = cast<MemberExpr>(Val: this)->getBase()->getSourceRange();
2787 return true;
2788
2789 case ArraySubscriptExprClass:
2790 WarnE = this;
2791 Loc = cast<ArraySubscriptExpr>(Val: this)->getRBracketLoc();
2792 R1 = cast<ArraySubscriptExpr>(Val: this)->getLHS()->getSourceRange();
2793 R2 = cast<ArraySubscriptExpr>(Val: this)->getRHS()->getSourceRange();
2794 return true;
2795
2796 case CXXOperatorCallExprClass: {
2797 // Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
2798 // overloads as there is no reasonable way to define these such that they
2799 // have non-trivial, desirable side-effects. See the -Wunused-comparison
2800 // warning: operators == and != are commonly typo'ed, and so warning on them
2801 // provides additional value as well. If this list is updated,
2802 // DiagnoseUnusedComparison should be as well.
2803 const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(Val: this);
2804 switch (Op->getOperator()) {
2805 default:
2806 break;
2807 case OO_EqualEqual:
2808 case OO_ExclaimEqual:
2809 case OO_Less:
2810 case OO_Greater:
2811 case OO_GreaterEqual:
2812 case OO_LessEqual:
2813 if (Op->getCallReturnType(Ctx)->isReferenceType() ||
2814 Op->getCallReturnType(Ctx)->isVoidType())
2815 break;
2816 WarnE = this;
2817 Loc = Op->getOperatorLoc();
2818 R1 = Op->getSourceRange();
2819 return true;
2820 }
2821
2822 // Fallthrough for generic call handling.
2823 [[fallthrough]];
2824 }
2825 case CallExprClass:
2826 case CXXMemberCallExprClass:
2827 case UserDefinedLiteralClass: {
2828 // If this is a direct call, get the callee.
2829 const CallExpr *CE = cast<CallExpr>(Val: this);
2830 // If the callee has attribute pure, const, or warn_unused_result, warn
2831 // about it. void foo() { strlen("bar"); } should warn.
2832 // Note: If new cases are added here, DiagnoseUnusedExprResult should be
2833 // updated to match for QoI.
2834 const Decl *FD = CE->getCalleeDecl();
2835 bool PureOrConst =
2836 FD && (FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>());
2837 if (CE->hasUnusedResultAttr(Ctx) || PureOrConst) {
2838 WarnE = this;
2839 Loc = getBeginLoc();
2840 R1 = getSourceRange();
2841
2842 if (unsigned NumArgs = CE->getNumArgs())
2843 R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2844 CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2845 return true;
2846 }
2847 return false;
2848 }
2849
2850 // If we don't know precisely what we're looking at, let's not warn.
2851 case UnresolvedLookupExprClass:
2852 case CXXUnresolvedConstructExprClass:
2853 case RecoveryExprClass:
2854 return false;
2855
2856 case CXXTemporaryObjectExprClass:
2857 case CXXConstructExprClass: {
2858 const auto *CE = cast<CXXConstructExpr>(Val: this);
2859 const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl();
2860
2861 if ((Type && Type->hasAttr<WarnUnusedAttr>()) ||
2862 CE->hasUnusedResultAttr(Ctx)) {
2863 WarnE = this;
2864 Loc = getBeginLoc();
2865 R1 = getSourceRange();
2866
2867 if (unsigned NumArgs = CE->getNumArgs())
2868 R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2869 CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2870 return true;
2871 }
2872 return false;
2873 }
2874
2875 case ObjCMessageExprClass: {
2876 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(Val: this);
2877 if (Ctx.getLangOpts().ObjCAutoRefCount &&
2878 ME->isInstanceMessage() &&
2879 !ME->getType()->isVoidType() &&
2880 ME->getMethodFamily() == OMF_init) {
2881 WarnE = this;
2882 Loc = getExprLoc();
2883 R1 = ME->getSourceRange();
2884 return true;
2885 }
2886
2887 if (ME->hasUnusedResultAttr(Ctx)) {
2888 WarnE = this;
2889 Loc = getExprLoc();
2890 return true;
2891 }
2892
2893 return false;
2894 }
2895
2896 case ObjCPropertyRefExprClass:
2897 case ObjCSubscriptRefExprClass:
2898 WarnE = this;
2899 Loc = getExprLoc();
2900 R1 = getSourceRange();
2901 return true;
2902
2903 case PseudoObjectExprClass: {
2904 const auto *POE = cast<PseudoObjectExpr>(Val: this);
2905
2906 // For some syntactic forms, we should always warn.
2907 if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(
2908 Val: POE->getSyntacticForm())) {
2909 WarnE = this;
2910 Loc = getExprLoc();
2911 R1 = getSourceRange();
2912 return true;
2913 }
2914
2915 // For others, we should never warn.
2916 if (auto *BO = dyn_cast<BinaryOperator>(Val: POE->getSyntacticForm()))
2917 if (BO->isAssignmentOp())
2918 return false;
2919 if (auto *UO = dyn_cast<UnaryOperator>(Val: POE->getSyntacticForm()))
2920 if (UO->isIncrementDecrementOp())
2921 return false;
2922
2923 // Otherwise, warn if the result expression would warn.
2924 const Expr *Result = POE->getResultExpr();
2925 return Result && Result->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2926 }
2927
2928 case StmtExprClass: {
2929 // Statement exprs don't logically have side effects themselves, but are
2930 // sometimes used in macros in ways that give them a type that is unused.
2931 // For example ({ blah; foo(); }) will end up with a type if foo has a type.
2932 // however, if the result of the stmt expr is dead, we don't want to emit a
2933 // warning.
2934 const CompoundStmt *CS = cast<StmtExpr>(Val: this)->getSubStmt();
2935 if (!CS->body_empty()) {
2936 if (const Expr *E = dyn_cast<Expr>(Val: CS->body_back()))
2937 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2938 if (const LabelStmt *Label = dyn_cast<LabelStmt>(Val: CS->body_back()))
2939 if (const Expr *E = dyn_cast<Expr>(Val: Label->getSubStmt()))
2940 return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2941 }
2942
2943 if (getType()->isVoidType())
2944 return false;
2945 WarnE = this;
2946 Loc = cast<StmtExpr>(Val: this)->getLParenLoc();
2947 R1 = getSourceRange();
2948 return true;
2949 }
2950 case CXXFunctionalCastExprClass:
2951 case CStyleCastExprClass: {
2952 // Ignore an explicit cast to void, except in C++98 if the operand is a
2953 // volatile glvalue for which we would trigger an implicit read in any
2954 // other language mode. (Such an implicit read always happens as part of
2955 // the lvalue conversion in C, and happens in C++ for expressions of all
2956 // forms where it seems likely the user intended to trigger a volatile
2957 // load.)
2958 const CastExpr *CE = cast<CastExpr>(Val: this);
2959 const Expr *SubE = CE->getSubExpr()->IgnoreParens();
2960 if (CE->getCastKind() == CK_ToVoid) {
2961 if (Ctx.getLangOpts().CPlusPlus && !Ctx.getLangOpts().CPlusPlus11 &&
2962 SubE->isReadIfDiscardedInCPlusPlus11()) {
2963 // Suppress the "unused value" warning for idiomatic usage of
2964 // '(void)var;' used to suppress "unused variable" warnings.
2965 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: SubE))
2966 if (auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
2967 if (!VD->isExternallyVisible())
2968 return false;
2969
2970 // The lvalue-to-rvalue conversion would have no effect for an array.
2971 // It's implausible that the programmer expected this to result in a
2972 // volatile array load, so don't warn.
2973 if (SubE->getType()->isArrayType())
2974 return false;
2975
2976 return SubE->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2977 }
2978 return false;
2979 }
2980
2981 // If this is a cast to a constructor conversion, check the operand.
2982 // Otherwise, the result of the cast is unused.
2983 if (CE->getCastKind() == CK_ConstructorConversion)
2984 return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2985 if (CE->getCastKind() == CK_Dependent)
2986 return false;
2987
2988 WarnE = this;
2989 if (const CXXFunctionalCastExpr *CXXCE =
2990 dyn_cast<CXXFunctionalCastExpr>(Val: this)) {
2991 Loc = CXXCE->getBeginLoc();
2992 R1 = CXXCE->getSubExpr()->getSourceRange();
2993 } else {
2994 const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(Val: this);
2995 Loc = CStyleCE->getLParenLoc();
2996 R1 = CStyleCE->getSubExpr()->getSourceRange();
2997 }
2998 return true;
2999 }
3000 case ImplicitCastExprClass: {
3001 const CastExpr *ICE = cast<ImplicitCastExpr>(Val: this);
3002
3003 // lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
3004 if (ICE->getCastKind() == CK_LValueToRValue &&
3005 ICE->getSubExpr()->getType().isVolatileQualified())
3006 return false;
3007
3008 return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
3009 }
3010 case CXXDefaultArgExprClass:
3011 return (cast<CXXDefaultArgExpr>(Val: this)
3012 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
3013 case CXXDefaultInitExprClass:
3014 return (cast<CXXDefaultInitExpr>(Val: this)
3015 ->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
3016
3017 case CXXNewExprClass:
3018 // FIXME: In theory, there might be new expressions that don't have side
3019 // effects (e.g. a placement new with an uninitialized POD).
3020 case CXXDeleteExprClass:
3021 return false;
3022 case MaterializeTemporaryExprClass:
3023 return cast<MaterializeTemporaryExpr>(Val: this)
3024 ->getSubExpr()
3025 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
3026 case CXXBindTemporaryExprClass:
3027 return cast<CXXBindTemporaryExpr>(Val: this)->getSubExpr()
3028 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
3029 case ExprWithCleanupsClass:
3030 return cast<ExprWithCleanups>(Val: this)->getSubExpr()
3031 ->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
3032 case OpaqueValueExprClass:
3033 return cast<OpaqueValueExpr>(Val: this)->getSourceExpr()->isUnusedResultAWarning(
3034 WarnE, Loc, R1, R2, Ctx);
3035 }
3036}
3037
3038/// isOBJCGCCandidate - Check if an expression is objc gc'able.
3039/// returns true, if it is; false otherwise.
3040bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
3041 const Expr *E = IgnoreParens();
3042 switch (E->getStmtClass()) {
3043 default:
3044 return false;
3045 case ObjCIvarRefExprClass:
3046 return true;
3047 case Expr::UnaryOperatorClass:
3048 return cast<UnaryOperator>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3049 case ImplicitCastExprClass:
3050 return cast<ImplicitCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3051 case MaterializeTemporaryExprClass:
3052 return cast<MaterializeTemporaryExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(
3053 Ctx);
3054 case CStyleCastExprClass:
3055 return cast<CStyleCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3056 case DeclRefExprClass: {
3057 const Decl *D = cast<DeclRefExpr>(Val: E)->getDecl();
3058
3059 if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
3060 if (VD->hasGlobalStorage())
3061 return true;
3062 QualType T = VD->getType();
3063 // dereferencing to a pointer is always a gc'able candidate,
3064 // unless it is __weak.
3065 return T->isPointerType() &&
3066 (Ctx.getObjCGCAttrKind(Ty: T) != Qualifiers::Weak);
3067 }
3068 return false;
3069 }
3070 case MemberExprClass: {
3071 const MemberExpr *M = cast<MemberExpr>(Val: E);
3072 return M->getBase()->isOBJCGCCandidate(Ctx);
3073 }
3074 case ArraySubscriptExprClass:
3075 return cast<ArraySubscriptExpr>(Val: E)->getBase()->isOBJCGCCandidate(Ctx);
3076 }
3077}
3078
3079bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
3080 if (isTypeDependent())
3081 return false;
3082 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
3083}
3084
3085QualType Expr::findBoundMemberType(const Expr *expr) {
3086 assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
3087
3088 // Bound member expressions are always one of these possibilities:
3089 // x->m x.m x->*y x.*y
3090 // (possibly parenthesized)
3091
3092 expr = expr->IgnoreParens();
3093 if (const MemberExpr *mem = dyn_cast<MemberExpr>(Val: expr)) {
3094 assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
3095 return mem->getMemberDecl()->getType();
3096 }
3097
3098 if (const BinaryOperator *op = dyn_cast<BinaryOperator>(Val: expr)) {
3099 QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
3100 ->getPointeeType();
3101 assert(type->isFunctionType());
3102 return type;
3103 }
3104
3105 assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr));
3106 return QualType();
3107}
3108
3109Expr *Expr::IgnoreImpCasts() {
3110 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitCastsSingleStep);
3111}
3112
3113Expr *Expr::IgnoreCasts() {
3114 return IgnoreExprNodes(E: this, Fns&: IgnoreCastsSingleStep);
3115}
3116
3117Expr *Expr::IgnoreImplicit() {
3118 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitSingleStep);
3119}
3120
3121Expr *Expr::IgnoreImplicitAsWritten() {
3122 return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitAsWrittenSingleStep);
3123}
3124
3125Expr *Expr::IgnoreParens() {
3126 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep);
3127}
3128
3129Expr *Expr::IgnoreParenImpCasts() {
3130 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3131 Fns&: IgnoreImplicitCastsExtraSingleStep);
3132}
3133
3134Expr *Expr::IgnoreParenCasts() {
3135 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep, Fns&: IgnoreCastsSingleStep);
3136}
3137
3138Expr *Expr::IgnoreConversionOperatorSingleStep() {
3139 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: this)) {
3140 if (isa_and_nonnull<CXXConversionDecl>(Val: MCE->getMethodDecl()))
3141 return MCE->getImplicitObjectArgument();
3142 }
3143 return this;
3144}
3145
3146Expr *Expr::IgnoreParenLValueCasts() {
3147 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3148 Fns&: IgnoreLValueCastsSingleStep);
3149}
3150
3151Expr *Expr::IgnoreParenBaseCasts() {
3152 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3153 Fns&: IgnoreBaseCastsSingleStep);
3154}
3155
3156Expr *Expr::IgnoreParenNoopCasts(const ASTContext &Ctx) {
3157 auto IgnoreNoopCastsSingleStep = [&Ctx](Expr *E) {
3158 if (auto *CE = dyn_cast<CastExpr>(Val: E)) {
3159 // We ignore integer <-> casts that are of the same width, ptr<->ptr and
3160 // ptr<->int casts of the same width. We also ignore all identity casts.
3161 Expr *SubExpr = CE->getSubExpr();
3162 bool IsIdentityCast =
3163 Ctx.hasSameUnqualifiedType(T1: E->getType(), T2: SubExpr->getType());
3164 bool IsSameWidthCast = (E->getType()->isPointerType() ||
3165 E->getType()->isIntegralType(Ctx)) &&
3166 (SubExpr->getType()->isPointerType() ||
3167 SubExpr->getType()->isIntegralType(Ctx)) &&
3168 (Ctx.getTypeSize(T: E->getType()) ==
3169 Ctx.getTypeSize(T: SubExpr->getType()));
3170
3171 if (IsIdentityCast || IsSameWidthCast)
3172 return SubExpr;
3173 } else if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: E))
3174 return NTTP->getReplacement();
3175
3176 return E;
3177 };
3178 return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3179 Fns&: IgnoreNoopCastsSingleStep);
3180}
3181
3182Expr *Expr::IgnoreUnlessSpelledInSource() {
3183 auto IgnoreImplicitConstructorSingleStep = [](Expr *E) {
3184 if (auto *Cast = dyn_cast<CXXFunctionalCastExpr>(Val: E)) {
3185 auto *SE = Cast->getSubExpr();
3186 if (SE->getSourceRange() == E->getSourceRange())
3187 return SE;
3188 }
3189
3190 if (auto *C = dyn_cast<CXXConstructExpr>(Val: E)) {
3191 auto NumArgs = C->getNumArgs();
3192 if (NumArgs == 1 ||
3193 (NumArgs > 1 && isa<CXXDefaultArgExpr>(Val: C->getArg(Arg: 1)))) {
3194 Expr *A = C->getArg(Arg: 0);
3195 if (A->getSourceRange() == E->getSourceRange() || C->isElidable())
3196 return A;
3197 }
3198 }
3199 return E;
3200 };
3201 auto IgnoreImplicitMemberCallSingleStep = [](Expr *E) {
3202 if (auto *C = dyn_cast<CXXMemberCallExpr>(Val: E)) {
3203 Expr *ExprNode = C->getImplicitObjectArgument();
3204 if (ExprNode->getSourceRange() == E->getSourceRange()) {
3205 return ExprNode;
3206 }
3207 if (auto *PE = dyn_cast<ParenExpr>(Val: ExprNode)) {
3208 if (PE->getSourceRange() == C->getSourceRange()) {
3209 return cast<Expr>(Val: PE);
3210 }
3211 }
3212 ExprNode = ExprNode->IgnoreParenImpCasts();
3213 if (ExprNode->getSourceRange() == E->getSourceRange())
3214 return ExprNode;
3215 }
3216 return E;
3217 };
3218
3219 // Used when Clang generates calls to std::get for decomposing
3220 // structured bindings.
3221 auto IgnoreImplicitCallSingleStep = [](Expr *E) {
3222 auto *C = dyn_cast<CallExpr>(Val: E);
3223 if (!C)
3224 return E;
3225
3226 // Looking for calls to a std::get, which usually just takes
3227 // 1 argument (i.e., the structure being decomposed). If it has
3228 // more than 1 argument, the others need to be defaulted.
3229 unsigned NumArgs = C->getNumArgs();
3230 if (NumArgs == 0 || (NumArgs > 1 && !isa<CXXDefaultArgExpr>(Val: C->getArg(Arg: 1))))
3231 return E;
3232
3233 Expr *A = C->getArg(Arg: 0);
3234
3235 // This was spelled out in source. Don't ignore.
3236 if (A->getSourceRange() != E->getSourceRange())
3237 return E;
3238
3239 // If the argument refers to a DecompositionDecl construction,
3240 // ignore it.
3241 if (IsDecompositionDeclRefExpr(E: A))
3242 return A;
3243
3244 return E;
3245 };
3246
3247 return IgnoreExprNodes(
3248 E: this, Fns&: IgnoreImplicitSingleStep, Fns&: IgnoreImplicitCastsExtraSingleStep,
3249 Fns&: IgnoreParensOnlySingleStep, Fns&: IgnoreImplicitConstructorSingleStep,
3250 Fns&: IgnoreImplicitMemberCallSingleStep, Fns&: IgnoreImplicitCallSingleStep);
3251}
3252
3253bool Expr::isDefaultArgument() const {
3254 const Expr *E = this;
3255 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3256 E = M->getSubExpr();
3257
3258 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E))
3259 E = ICE->getSubExprAsWritten();
3260
3261 return isa<CXXDefaultArgExpr>(Val: E);
3262}
3263
3264/// Skip over any no-op casts and any temporary-binding
3265/// expressions.
3266static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
3267 if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3268 E = M->getSubExpr();
3269
3270 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3271 if (ICE->getCastKind() == CK_NoOp)
3272 E = ICE->getSubExpr();
3273 else
3274 break;
3275 }
3276
3277 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(Val: E))
3278 E = BE->getSubExpr();
3279
3280 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3281 if (ICE->getCastKind() == CK_NoOp)
3282 E = ICE->getSubExpr();
3283 else
3284 break;
3285 }
3286
3287 return E->IgnoreParens();
3288}
3289
3290/// isTemporaryObject - Determines if this expression produces a
3291/// temporary of the given class type.
3292bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
3293 if (!C.hasSameUnqualifiedType(T1: getType(), T2: C.getCanonicalTagType(TD: TempTy)))
3294 return false;
3295
3296 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(E: this);
3297
3298 // Temporaries are by definition pr-values of class type.
3299 if (!E->Classify(Ctx&: C).isPRValue()) {
3300 // In this context, property reference is a message call and is pr-value.
3301 if (!isa<ObjCPropertyRefExpr>(Val: E))
3302 return false;
3303 }
3304
3305 // Black-list a few cases which yield pr-values of class type that don't
3306 // refer to temporaries of that type:
3307
3308 // - implicit derived-to-base conversions
3309 if (const auto *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3310 switch (ICE->getCastKind()) {
3311 case CK_DerivedToBase:
3312 case CK_UncheckedDerivedToBase:
3313 return false;
3314 default:
3315 break;
3316 }
3317 }
3318
3319 // - member expressions (all)
3320 if (isa<MemberExpr>(Val: E))
3321 return false;
3322
3323 if (const auto *BO = dyn_cast<BinaryOperator>(Val: E))
3324 if (BO->isPtrMemOp())
3325 return false;
3326
3327 // - opaque values (all)
3328 if (isa<OpaqueValueExpr>(Val: E))
3329 return false;
3330
3331 return true;
3332}
3333
3334bool Expr::isImplicitCXXThis() const {
3335 const Expr *E = this;
3336
3337 // Strip away parentheses and casts we don't care about.
3338 while (true) {
3339 if (const ParenExpr *Paren = dyn_cast<ParenExpr>(Val: E)) {
3340 E = Paren->getSubExpr();
3341 continue;
3342 }
3343
3344 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3345 if (ICE->getCastKind() == CK_NoOp ||
3346 ICE->getCastKind() == CK_LValueToRValue ||
3347 ICE->getCastKind() == CK_DerivedToBase ||
3348 ICE->getCastKind() == CK_UncheckedDerivedToBase) {
3349 E = ICE->getSubExpr();
3350 continue;
3351 }
3352 }
3353
3354 if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(Val: E)) {
3355 if (UnOp->getOpcode() == UO_Extension) {
3356 E = UnOp->getSubExpr();
3357 continue;
3358 }
3359 }
3360
3361 if (const MaterializeTemporaryExpr *M
3362 = dyn_cast<MaterializeTemporaryExpr>(Val: E)) {
3363 E = M->getSubExpr();
3364 continue;
3365 }
3366
3367 break;
3368 }
3369
3370 if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(Val: E))
3371 return This->isImplicit();
3372
3373 return false;
3374}
3375
3376/// hasAnyTypeDependentArguments - Determines if any of the expressions
3377/// in Exprs is type-dependent.
3378bool Expr::hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs) {
3379 for (unsigned I = 0; I < Exprs.size(); ++I)
3380 if (Exprs[I]->isTypeDependent())
3381 return true;
3382
3383 return false;
3384}
3385
3386bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
3387 const Expr **Culprit) const {
3388 assert(!isValueDependent() &&
3389 "Expression evaluator can't be called on a dependent expression.");
3390
3391 // This function is attempting whether an expression is an initializer
3392 // which can be evaluated at compile-time. It very closely parallels
3393 // ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
3394 // will lead to unexpected results. Like ConstExprEmitter, it falls back
3395 // to isEvaluatable most of the time.
3396 //
3397 // If we ever capture reference-binding directly in the AST, we can
3398 // kill the second parameter.
3399
3400 if (IsForRef) {
3401 if (auto *EWC = dyn_cast<ExprWithCleanups>(Val: this))
3402 return EWC->getSubExpr()->isConstantInitializer(Ctx, IsForRef: true, Culprit);
3403 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Val: this))
3404 return MTE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3405 EvalResult Result;
3406 if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
3407 return true;
3408 if (Culprit)
3409 *Culprit = this;
3410 return false;
3411 }
3412
3413 switch (getStmtClass()) {
3414 default: break;
3415 case Stmt::ExprWithCleanupsClass:
3416 return cast<ExprWithCleanups>(Val: this)->getSubExpr()->isConstantInitializer(
3417 Ctx, IsForRef, Culprit);
3418 case StringLiteralClass:
3419 case ObjCEncodeExprClass:
3420 return true;
3421 case CXXTemporaryObjectExprClass:
3422 case CXXConstructExprClass: {
3423 const CXXConstructExpr *CE = cast<CXXConstructExpr>(Val: this);
3424
3425 if (CE->getConstructor()->isTrivial() &&
3426 CE->getConstructor()->getParent()->hasTrivialDestructor()) {
3427 // Trivial default constructor
3428 if (!CE->getNumArgs()) return true;
3429
3430 // Trivial copy constructor
3431 assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument");
3432 return CE->getArg(Arg: 0)->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3433 }
3434
3435 break;
3436 }
3437 case ConstantExprClass: {
3438 // FIXME: We should be able to return "true" here, but it can lead to extra
3439 // error messages. E.g. in Sema/array-init.c.
3440 const Expr *Exp = cast<ConstantExpr>(Val: this)->getSubExpr();
3441 return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3442 }
3443 case CompoundLiteralExprClass: {
3444 // This handles gcc's extension that allows global initializers like
3445 // "struct x {int x;} x = (struct x) {};".
3446 // FIXME: This accepts other cases it shouldn't!
3447 const Expr *Exp = cast<CompoundLiteralExpr>(Val: this)->getInitializer();
3448 return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3449 }
3450 case DesignatedInitUpdateExprClass: {
3451 const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(Val: this);
3452 return DIUE->getBase()->isConstantInitializer(Ctx, IsForRef: false, Culprit) &&
3453 DIUE->getUpdater()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3454 }
3455 case InitListExprClass: {
3456 // C++ [dcl.init.aggr]p2:
3457 // The elements of an aggregate are:
3458 // - for an array, the array elements in increasing subscript order, or
3459 // - for a class, the direct base classes in declaration order, followed
3460 // by the direct non-static data members (11.4) that are not members of
3461 // an anonymous union, in declaration order.
3462 const InitListExpr *ILE = cast<InitListExpr>(Val: this);
3463 assert(ILE->isSemanticForm() && "InitListExpr must be in semantic form");
3464
3465 if (ILE->isTransparent())
3466 return ILE->getInit(Init: 0)->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3467
3468 if (ILE->getType()->isArrayType()) {
3469 unsigned numInits = ILE->getNumInits();
3470 for (unsigned i = 0; i < numInits; i++) {
3471 if (!ILE->getInit(Init: i)->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3472 return false;
3473 }
3474 return true;
3475 }
3476
3477 if (ILE->getType()->isRecordType()) {
3478 unsigned ElementNo = 0;
3479 auto *RD = ILE->getType()->castAsRecordDecl();
3480
3481 // In C++17, bases were added to the list of members used by aggregate
3482 // initialization.
3483 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(Val: RD)) {
3484 for (unsigned i = 0, e = CXXRD->getNumBases(); i < e; i++) {
3485 if (ElementNo < ILE->getNumInits()) {
3486 const Expr *Elt = ILE->getInit(Init: ElementNo++);
3487 if (!Elt->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3488 return false;
3489 }
3490 }
3491 }
3492
3493 for (const auto *Field : RD->fields()) {
3494 // If this is a union, skip all the fields that aren't being initialized.
3495 if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
3496 continue;
3497
3498 // Don't emit anonymous bitfields, they just affect layout.
3499 if (Field->isUnnamedBitField())
3500 continue;
3501
3502 if (ElementNo < ILE->getNumInits()) {
3503 const Expr *Elt = ILE->getInit(Init: ElementNo++);
3504 if (Field->isBitField()) {
3505 // Bitfields have to evaluate to an integer.
3506 EvalResult Result;
3507 if (!Elt->EvaluateAsInt(Result, Ctx)) {
3508 if (Culprit)
3509 *Culprit = Elt;
3510 return false;
3511 }
3512 } else {
3513 bool RefType = Field->getType()->isReferenceType();
3514 if (!Elt->isConstantInitializer(Ctx, IsForRef: RefType, Culprit))
3515 return false;
3516 }
3517 }
3518 }
3519 return true;
3520 }
3521
3522 break;
3523 }
3524 case ImplicitValueInitExprClass:
3525 case NoInitExprClass:
3526 return true;
3527 case ParenExprClass:
3528 return cast<ParenExpr>(Val: this)->getSubExpr()
3529 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3530 case GenericSelectionExprClass:
3531 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()
3532 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3533 case ChooseExprClass:
3534 if (cast<ChooseExpr>(Val: this)->isConditionDependent()) {
3535 if (Culprit)
3536 *Culprit = this;
3537 return false;
3538 }
3539 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()
3540 ->isConstantInitializer(Ctx, IsForRef, Culprit);
3541 case UnaryOperatorClass: {
3542 const UnaryOperator* Exp = cast<UnaryOperator>(Val: this);
3543 if (Exp->getOpcode() == UO_Extension)
3544 return Exp->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3545 break;
3546 }
3547 case ObjCBoxedExprClass: {
3548 const ObjCBoxedExpr *BE = cast<ObjCBoxedExpr>(Val: this);
3549 if (Culprit)
3550 *Culprit = this;
3551 return BE->isExpressibleAsConstantInitializer();
3552 }
3553 case ObjCArrayLiteralClass: {
3554 const ObjCArrayLiteral *ALE = cast<ObjCArrayLiteral>(Val: this);
3555 if (Culprit)
3556 *Culprit = this;
3557 return ALE->isExpressibleAsConstantInitializer();
3558 }
3559 case ObjCDictionaryLiteralClass: {
3560 const ObjCDictionaryLiteral *DLE = cast<ObjCDictionaryLiteral>(Val: this);
3561 if (Culprit)
3562 *Culprit = this;
3563 return DLE->isExpressibleAsConstantInitializer();
3564 }
3565 case PackIndexingExprClass: {
3566 return cast<PackIndexingExpr>(Val: this)
3567 ->getSelectedExpr()
3568 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3569 }
3570 case CXXFunctionalCastExprClass:
3571 case CXXStaticCastExprClass:
3572 case ImplicitCastExprClass:
3573 case CStyleCastExprClass:
3574 case ObjCBridgedCastExprClass:
3575 case CXXDynamicCastExprClass:
3576 case CXXReinterpretCastExprClass:
3577 case CXXAddrspaceCastExprClass:
3578 case CXXConstCastExprClass: {
3579 const CastExpr *CE = cast<CastExpr>(Val: this);
3580
3581 // Handle misc casts we want to ignore.
3582 if (CE->getCastKind() == CK_NoOp ||
3583 CE->getCastKind() == CK_LValueToRValue ||
3584 CE->getCastKind() == CK_ToUnion ||
3585 CE->getCastKind() == CK_ConstructorConversion ||
3586 CE->getCastKind() == CK_NonAtomicToAtomic ||
3587 CE->getCastKind() == CK_AtomicToNonAtomic ||
3588 CE->getCastKind() == CK_NullToPointer ||
3589 CE->getCastKind() == CK_ARCReclaimReturnedObject ||
3590 CE->getCastKind() == CK_IntToOCLSampler)
3591 return CE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3592
3593 break;
3594 }
3595 case MaterializeTemporaryExprClass:
3596 return cast<MaterializeTemporaryExpr>(Val: this)
3597 ->getSubExpr()
3598 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3599
3600 case SubstNonTypeTemplateParmExprClass:
3601 return cast<SubstNonTypeTemplateParmExpr>(Val: this)->getReplacement()
3602 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3603 case CXXDefaultArgExprClass:
3604 return cast<CXXDefaultArgExpr>(Val: this)->getExpr()
3605 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3606 case CXXDefaultInitExprClass:
3607 return cast<CXXDefaultInitExpr>(Val: this)->getExpr()
3608 ->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3609 }
3610 // Allow certain forms of UB in constant initializers: signed integer
3611 // overflow and floating-point division by zero. We'll give a warning on
3612 // these, but they're common enough that we have to accept them.
3613 if (isEvaluatable(Ctx, AllowSideEffects: SE_AllowUndefinedBehavior))
3614 return true;
3615 if (Culprit)
3616 *Culprit = this;
3617 return false;
3618}
3619
3620bool CallExpr::isBuiltinAssumeFalse(const ASTContext &Ctx) const {
3621 unsigned BuiltinID = getBuiltinCallee();
3622 if (BuiltinID != Builtin::BI__assume &&
3623 BuiltinID != Builtin::BI__builtin_assume)
3624 return false;
3625
3626 const Expr* Arg = getArg(Arg: 0);
3627 bool ArgVal;
3628 return !Arg->isValueDependent() &&
3629 Arg->EvaluateAsBooleanCondition(Result&: ArgVal, Ctx) && !ArgVal;
3630}
3631
3632const AllocSizeAttr *CallExpr::getCalleeAllocSizeAttr() const {
3633 if (const FunctionDecl *DirectCallee = getDirectCallee())
3634 return DirectCallee->getAttr<AllocSizeAttr>();
3635 if (const Decl *IndirectCallee = getCalleeDecl())
3636 return IndirectCallee->getAttr<AllocSizeAttr>();
3637 return nullptr;
3638}
3639
3640std::optional<llvm::APInt>
3641CallExpr::evaluateBytesReturnedByAllocSizeCall(const ASTContext &Ctx) const {
3642 const AllocSizeAttr *AllocSize = getCalleeAllocSizeAttr();
3643
3644 assert(AllocSize && AllocSize->getElemSizeParam().isValid());
3645 unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex();
3646 unsigned BitsInSizeT = Ctx.getTypeSize(T: Ctx.getSizeType());
3647 if (getNumArgs() <= SizeArgNo)
3648 return std::nullopt;
3649
3650 auto EvaluateAsSizeT = [&](const Expr *E, llvm::APSInt &Into) {
3651 Expr::EvalResult ExprResult;
3652 if (E->isValueDependent() ||
3653 !E->EvaluateAsInt(Result&: ExprResult, Ctx, AllowSideEffects: Expr::SE_AllowSideEffects))
3654 return false;
3655 Into = ExprResult.Val.getInt();
3656 if (Into.isNegative() || !Into.isIntN(N: BitsInSizeT))
3657 return false;
3658 Into = Into.extOrTrunc(width: BitsInSizeT);
3659 return true;
3660 };
3661
3662 llvm::APSInt SizeOfElem;
3663 if (!EvaluateAsSizeT(getArg(Arg: SizeArgNo), SizeOfElem))
3664 return std::nullopt;
3665
3666 if (!AllocSize->getNumElemsParam().isValid())
3667 return SizeOfElem;
3668
3669 llvm::APSInt NumberOfElems;
3670 unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex();
3671 if (!EvaluateAsSizeT(getArg(Arg: NumArgNo), NumberOfElems))
3672 return std::nullopt;
3673
3674 bool Overflow;
3675 llvm::APInt BytesAvailable = SizeOfElem.umul_ov(RHS: NumberOfElems, Overflow);
3676 if (Overflow)
3677 return std::nullopt;
3678
3679 return BytesAvailable;
3680}
3681
3682bool CallExpr::isCallToStdMove() const {
3683 return getBuiltinCallee() == Builtin::BImove;
3684}
3685
3686namespace {
3687 /// Look for any side effects within a Stmt.
3688 class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
3689 typedef ConstEvaluatedExprVisitor<SideEffectFinder> Inherited;
3690 const bool IncludePossibleEffects;
3691 bool HasSideEffects;
3692
3693 public:
3694 explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
3695 : Inherited(Context),
3696 IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }
3697
3698 bool hasSideEffects() const { return HasSideEffects; }
3699
3700 void VisitDecl(const Decl *D) {
3701 if (!D)
3702 return;
3703
3704 // We assume the caller checks subexpressions (eg, the initializer, VLA
3705 // bounds) for side-effects on our behalf.
3706 if (auto *VD = dyn_cast<VarDecl>(Val: D)) {
3707 // Registering a destructor is a side-effect.
3708 if (IncludePossibleEffects && VD->isThisDeclarationADefinition() &&
3709 VD->needsDestruction(Ctx: Context))
3710 HasSideEffects = true;
3711 }
3712 }
3713
3714 void VisitDeclStmt(const DeclStmt *DS) {
3715 for (auto *D : DS->decls())
3716 VisitDecl(D);
3717 Inherited::VisitDeclStmt(S: DS);
3718 }
3719
3720 void VisitExpr(const Expr *E) {
3721 if (!HasSideEffects &&
3722 E->HasSideEffects(Ctx: Context, IncludePossibleEffects))
3723 HasSideEffects = true;
3724 }
3725 };
3726}
3727
3728bool Expr::HasSideEffects(const ASTContext &Ctx,
3729 bool IncludePossibleEffects) const {
3730 // In circumstances where we care about definite side effects instead of
3731 // potential side effects, we want to ignore expressions that are part of a
3732 // macro expansion as a potential side effect.
3733 if (!IncludePossibleEffects && getExprLoc().isMacroID())
3734 return false;
3735
3736 switch (getStmtClass()) {
3737 case NoStmtClass:
3738#define ABSTRACT_STMT(Type)
3739#define STMT(Type, Base) case Type##Class:
3740#define EXPR(Type, Base)
3741#include "clang/AST/StmtNodes.inc"
3742 llvm_unreachable("unexpected Expr kind");
3743
3744 case DependentScopeDeclRefExprClass:
3745 case DependentTemplateIdExprClass:
3746 case CXXUnresolvedConstructExprClass:
3747 case CXXDependentScopeMemberExprClass:
3748 case UnresolvedLookupExprClass:
3749 case UnresolvedMemberExprClass:
3750 case PackExpansionExprClass:
3751 case SubstNonTypeTemplateParmPackExprClass:
3752 case FunctionParmPackExprClass:
3753 case RecoveryExprClass:
3754 case CXXFoldExprClass:
3755 case CXXExpansionSelectExprClass:
3756 // Make a conservative assumption for dependent nodes.
3757 return IncludePossibleEffects;
3758
3759 case DeclRefExprClass:
3760 case ObjCIvarRefExprClass:
3761 case PredefinedExprClass:
3762 case IntegerLiteralClass:
3763 case FixedPointLiteralClass:
3764 case FloatingLiteralClass:
3765 case ImaginaryLiteralClass:
3766 case StringLiteralClass:
3767 case CharacterLiteralClass:
3768 case OffsetOfExprClass:
3769 case ImplicitValueInitExprClass:
3770 case UnaryExprOrTypeTraitExprClass:
3771 case AddrLabelExprClass:
3772 case GNUNullExprClass:
3773 case ArrayInitIndexExprClass:
3774 case NoInitExprClass:
3775 case CXXBoolLiteralExprClass:
3776 case CXXNullPtrLiteralExprClass:
3777 case CXXThisExprClass:
3778 case CXXScalarValueInitExprClass:
3779 case TypeTraitExprClass:
3780 case ArrayTypeTraitExprClass:
3781 case ExpressionTraitExprClass:
3782 case CXXNoexceptExprClass:
3783 case SizeOfPackExprClass:
3784 case ObjCStringLiteralClass:
3785 case ObjCEncodeExprClass:
3786 case ObjCBoolLiteralExprClass:
3787 case ObjCAvailabilityCheckExprClass:
3788 case CXXUuidofExprClass:
3789 case OpaqueValueExprClass:
3790 case SourceLocExprClass:
3791 case EmbedExprClass:
3792 case ConceptSpecializationExprClass:
3793 case RequiresExprClass:
3794 case SYCLUniqueStableNameExprClass:
3795 case PackIndexingExprClass:
3796 case HLSLOutArgExprClass:
3797 case OpenACCAsteriskSizeExprClass:
3798 case CXXReflectExprClass:
3799 // These never have a side-effect.
3800 return false;
3801
3802 case ConstantExprClass:
3803 // FIXME: Move this into the "return false;" block above.
3804 return cast<ConstantExpr>(Val: this)->getSubExpr()->HasSideEffects(
3805 Ctx, IncludePossibleEffects);
3806
3807 case CallExprClass:
3808 case CXXOperatorCallExprClass:
3809 case CXXMemberCallExprClass:
3810 case CUDAKernelCallExprClass:
3811 case UserDefinedLiteralClass: {
3812 // We don't know a call definitely has side effects, except for calls
3813 // to pure/const functions that definitely don't.
3814 // If the call itself is considered side-effect free, check the operands.
3815 const Decl *FD = cast<CallExpr>(Val: this)->getCalleeDecl();
3816 bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
3817 if (IsPure || !IncludePossibleEffects)
3818 break;
3819 return true;
3820 }
3821
3822 case BlockExprClass:
3823 case CXXBindTemporaryExprClass:
3824 if (!IncludePossibleEffects)
3825 break;
3826 return true;
3827
3828 case MSPropertyRefExprClass:
3829 case MSPropertySubscriptExprClass:
3830 case CompoundAssignOperatorClass:
3831 case VAArgExprClass:
3832 case AtomicExprClass:
3833 case CXXThrowExprClass:
3834 case CXXNewExprClass:
3835 case CXXDeleteExprClass:
3836 case CoawaitExprClass:
3837 case DependentCoawaitExprClass:
3838 case CoyieldExprClass:
3839 // These always have a side-effect.
3840 return true;
3841
3842 case StmtExprClass: {
3843 // StmtExprs have a side-effect if any substatement does.
3844 SideEffectFinder Finder(Ctx, IncludePossibleEffects);
3845 Finder.Visit(S: cast<StmtExpr>(Val: this)->getSubStmt());
3846 return Finder.hasSideEffects();
3847 }
3848
3849 case ExprWithCleanupsClass:
3850 if (IncludePossibleEffects)
3851 if (cast<ExprWithCleanups>(Val: this)->cleanupsHaveSideEffects())
3852 return true;
3853 break;
3854
3855 case ParenExprClass:
3856 case ArraySubscriptExprClass:
3857 case MatrixSingleSubscriptExprClass:
3858 case MatrixSubscriptExprClass:
3859 case ArraySectionExprClass:
3860 case OMPArrayShapingExprClass:
3861 case OMPIteratorExprClass:
3862 case MemberExprClass:
3863 case ConditionalOperatorClass:
3864 case BinaryConditionalOperatorClass:
3865 case CompoundLiteralExprClass:
3866 case ExtVectorElementExprClass:
3867 case MatrixElementExprClass:
3868 case DesignatedInitExprClass:
3869 case DesignatedInitUpdateExprClass:
3870 case ArrayInitLoopExprClass:
3871 case ParenListExprClass:
3872 case CXXPseudoDestructorExprClass:
3873 case CXXRewrittenBinaryOperatorClass:
3874 case CXXStdInitializerListExprClass:
3875 case SubstNonTypeTemplateParmExprClass:
3876 case MaterializeTemporaryExprClass:
3877 case ShuffleVectorExprClass:
3878 case ConvertVectorExprClass:
3879 case AsTypeExprClass:
3880 case CXXParenListInitExprClass:
3881 // These have a side-effect if any subexpression does.
3882 break;
3883
3884 case UnaryOperatorClass:
3885 if (cast<UnaryOperator>(Val: this)->isIncrementDecrementOp())
3886 return true;
3887 break;
3888
3889 case BinaryOperatorClass:
3890 if (cast<BinaryOperator>(Val: this)->isAssignmentOp())
3891 return true;
3892 break;
3893
3894 case InitListExprClass:
3895 // FIXME: The children for an InitListExpr doesn't include the array filler.
3896 if (const Expr *E = cast<InitListExpr>(Val: this)->getArrayFiller())
3897 if (E->HasSideEffects(Ctx, IncludePossibleEffects))
3898 return true;
3899 break;
3900
3901 case GenericSelectionExprClass:
3902 return cast<GenericSelectionExpr>(Val: this)->getResultExpr()->HasSideEffects(
3903 Ctx, IncludePossibleEffects);
3904
3905 case ChooseExprClass:
3906 return cast<ChooseExpr>(Val: this)->getChosenSubExpr()->HasSideEffects(
3907 Ctx, IncludePossibleEffects);
3908
3909 case CXXDefaultArgExprClass:
3910 return cast<CXXDefaultArgExpr>(Val: this)->getExpr()->HasSideEffects(
3911 Ctx, IncludePossibleEffects);
3912
3913 case CXXDefaultInitExprClass: {
3914 const FieldDecl *FD = cast<CXXDefaultInitExpr>(Val: this)->getField();
3915 if (const Expr *E = FD->getInClassInitializer())
3916 return E->HasSideEffects(Ctx, IncludePossibleEffects);
3917 // If we've not yet parsed the initializer, assume it has side-effects.
3918 return true;
3919 }
3920
3921 case CXXDynamicCastExprClass: {
3922 // A dynamic_cast expression has side-effects if it can throw.
3923 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(Val: this);
3924 if (DCE->getTypeAsWritten()->isReferenceType() &&
3925 DCE->getCastKind() == CK_Dynamic)
3926 return true;
3927 }
3928 [[fallthrough]];
3929 case ImplicitCastExprClass:
3930 case CStyleCastExprClass:
3931 case CXXStaticCastExprClass:
3932 case CXXReinterpretCastExprClass:
3933 case CXXConstCastExprClass:
3934 case CXXAddrspaceCastExprClass:
3935 case CXXFunctionalCastExprClass:
3936 case BuiltinBitCastExprClass: {
3937 // While volatile reads are side-effecting in both C and C++, we treat them
3938 // as having possible (not definite) side-effects. This allows idiomatic
3939 // code to behave without warning, such as sizeof(*v) for a volatile-
3940 // qualified pointer.
3941 if (!IncludePossibleEffects)
3942 break;
3943
3944 const CastExpr *CE = cast<CastExpr>(Val: this);
3945 if (CE->getCastKind() == CK_LValueToRValue &&
3946 CE->getSubExpr()->getType().isVolatileQualified())
3947 return true;
3948 break;
3949 }
3950
3951 case CXXTypeidExprClass: {
3952 const auto *TE = cast<CXXTypeidExpr>(Val: this);
3953 if (!TE->isPotentiallyEvaluated())
3954 return false;
3955
3956 // If this type id expression can throw because of a null pointer, that is a
3957 // side-effect independent of if the operand has a side-effect
3958 if (IncludePossibleEffects && TE->hasNullCheck())
3959 return true;
3960
3961 break;
3962 }
3963
3964 case CXXConstructExprClass:
3965 case CXXTemporaryObjectExprClass: {
3966 const CXXConstructExpr *CE = cast<CXXConstructExpr>(Val: this);
3967 if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
3968 return true;
3969 // A trivial constructor does not add any side-effects of its own. Just look
3970 // at its arguments.
3971 break;
3972 }
3973
3974 case CXXInheritedCtorInitExprClass: {
3975 const auto *ICIE = cast<CXXInheritedCtorInitExpr>(Val: this);
3976 if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
3977 return true;
3978 break;
3979 }
3980
3981 case LambdaExprClass: {
3982 const LambdaExpr *LE = cast<LambdaExpr>(Val: this);
3983 for (Expr *E : LE->capture_inits())
3984 if (E && E->HasSideEffects(Ctx, IncludePossibleEffects))
3985 return true;
3986 return false;
3987 }
3988
3989 case PseudoObjectExprClass: {
3990 // Only look for side-effects in the semantic form, and look past
3991 // OpaqueValueExpr bindings in that form.
3992 const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(Val: this);
3993 for (PseudoObjectExpr::const_semantics_iterator I = PO->semantics_begin(),
3994 E = PO->semantics_end();
3995 I != E; ++I) {
3996 const Expr *Subexpr = *I;
3997 if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Val: Subexpr))
3998 Subexpr = OVE->getSourceExpr();
3999 if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
4000 return true;
4001 }
4002 return false;
4003 }
4004
4005 case ObjCBoxedExprClass:
4006 case ObjCArrayLiteralClass:
4007 case ObjCDictionaryLiteralClass:
4008 case ObjCSelectorExprClass:
4009 case ObjCProtocolExprClass:
4010 case ObjCIsaExprClass:
4011 case ObjCIndirectCopyRestoreExprClass:
4012 case ObjCSubscriptRefExprClass:
4013 case ObjCBridgedCastExprClass:
4014 case ObjCMessageExprClass:
4015 case ObjCPropertyRefExprClass:
4016 // FIXME: Classify these cases better.
4017 if (IncludePossibleEffects)
4018 return true;
4019 break;
4020 }
4021
4022 // Recurse to children.
4023 for (const Stmt *SubStmt : children())
4024 if (SubStmt &&
4025 cast<Expr>(Val: SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
4026 return true;
4027
4028 return false;
4029}
4030
4031FPOptions Expr::getFPFeaturesInEffect(const LangOptions &LO) const {
4032 if (auto Call = dyn_cast<CallExpr>(Val: this))
4033 return Call->getFPFeaturesInEffect(LO);
4034 if (auto UO = dyn_cast<UnaryOperator>(Val: this))
4035 return UO->getFPFeaturesInEffect(LO);
4036 if (auto BO = dyn_cast<BinaryOperator>(Val: this))
4037 return BO->getFPFeaturesInEffect(LO);
4038 if (auto Cast = dyn_cast<CastExpr>(Val: this))
4039 return Cast->getFPFeaturesInEffect(LO);
4040 if (auto ConvertVector = dyn_cast<ConvertVectorExpr>(Val: this))
4041 return ConvertVector->getFPFeaturesInEffect(LO);
4042 return FPOptions::defaultWithoutTrailingStorage(LO);
4043}
4044
4045namespace {
4046 /// Look for a call to a non-trivial function within an expression.
4047 class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
4048 {
4049 typedef ConstEvaluatedExprVisitor<NonTrivialCallFinder> Inherited;
4050
4051 bool NonTrivial;
4052
4053 public:
4054 explicit NonTrivialCallFinder(const ASTContext &Context)
4055 : Inherited(Context), NonTrivial(false) { }
4056
4057 bool hasNonTrivialCall() const { return NonTrivial; }
4058
4059 void VisitCallExpr(const CallExpr *E) {
4060 if (const CXXMethodDecl *Method
4061 = dyn_cast_or_null<const CXXMethodDecl>(Val: E->getCalleeDecl())) {
4062 if (Method->isTrivial()) {
4063 // Recurse to children of the call.
4064 Inherited::VisitStmt(S: E);
4065 return;
4066 }
4067 }
4068
4069 NonTrivial = true;
4070 }
4071
4072 void VisitCXXConstructExpr(const CXXConstructExpr *E) {
4073 if (E->getConstructor()->isTrivial()) {
4074 // Recurse to children of the call.
4075 Inherited::VisitStmt(S: E);
4076 return;
4077 }
4078
4079 NonTrivial = true;
4080 }
4081
4082 void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
4083 // Destructor of the temporary might be null if destructor declaration
4084 // is not valid.
4085 if (const CXXDestructorDecl *DtorDecl =
4086 E->getTemporary()->getDestructor()) {
4087 if (DtorDecl->isTrivial()) {
4088 Inherited::VisitStmt(S: E);
4089 return;
4090 }
4091 }
4092
4093 NonTrivial = true;
4094 }
4095 };
4096}
4097
4098bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
4099 NonTrivialCallFinder Finder(Ctx);
4100 Finder.Visit(S: this);
4101 return Finder.hasNonTrivialCall();
4102}
4103
4104/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
4105/// pointer constant or not, as well as the specific kind of constant detected.
4106/// Null pointer constants can be integer constant expressions with the
4107/// value zero, casts of zero to void*, nullptr (C++0X), or __null
4108/// (a GNU extension).
4109Expr::NullPointerConstantKind
4110Expr::isNullPointerConstant(ASTContext &Ctx,
4111 NullPointerConstantValueDependence NPC) const {
4112 if (isValueDependent() &&
4113 (!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
4114 // Error-dependent expr should never be a null pointer.
4115 if (containsErrors())
4116 return NPCK_NotNull;
4117 switch (NPC) {
4118 case NPC_NeverValueDependent:
4119 llvm_unreachable("Unexpected value dependent expression!");
4120 case NPC_ValueDependentIsNull:
4121 if (isTypeDependent() || getType()->isIntegralType(Ctx))
4122 return NPCK_ZeroExpression;
4123 else
4124 return NPCK_NotNull;
4125
4126 case NPC_ValueDependentIsNotNull:
4127 return NPCK_NotNull;
4128 }
4129 }
4130
4131 // Strip off a cast to void*, if it exists. Except in C++.
4132 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(Val: this)) {
4133 if (!Ctx.getLangOpts().CPlusPlus) {
4134 // Check that it is a cast to void*.
4135 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
4136 QualType Pointee = PT->getPointeeType();
4137 Qualifiers Qs = Pointee.getQualifiers();
4138 // Only (void*)0 or equivalent are treated as nullptr. If pointee type
4139 // has non-default address space it is not treated as nullptr.
4140 // (__generic void*)0 in OpenCL 2.0 should not be treated as nullptr
4141 // since it cannot be assigned to a pointer to constant address space.
4142 if (Ctx.getLangOpts().OpenCL &&
4143 Pointee.getAddressSpace() == Ctx.getDefaultOpenCLPointeeAddrSpace())
4144 Qs.removeAddressSpace();
4145
4146 if (Pointee->isVoidType() && Qs.empty() && // to void*
4147 CE->getSubExpr()->getType()->isIntegerType()) // from int
4148 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4149 }
4150 }
4151 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: this)) {
4152 // Ignore the ImplicitCastExpr type entirely.
4153 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4154 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(Val: this)) {
4155 // Accept ((void*)0) as a null pointer constant, as many other
4156 // implementations do.
4157 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4158 } else if (const GenericSelectionExpr *GE =
4159 dyn_cast<GenericSelectionExpr>(Val: this)) {
4160 if (GE->isResultDependent())
4161 return NPCK_NotNull;
4162 return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
4163 } else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(Val: this)) {
4164 if (CE->isConditionDependent())
4165 return NPCK_NotNull;
4166 return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
4167 } else if (const CXXDefaultArgExpr *DefaultArg
4168 = dyn_cast<CXXDefaultArgExpr>(Val: this)) {
4169 // See through default argument expressions.
4170 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
4171 } else if (const CXXDefaultInitExpr *DefaultInit
4172 = dyn_cast<CXXDefaultInitExpr>(Val: this)) {
4173 // See through default initializer expressions.
4174 return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
4175 } else if (isa<GNUNullExpr>(Val: this)) {
4176 // The GNU __null extension is always a null pointer constant.
4177 return NPCK_GNUNull;
4178 } else if (const MaterializeTemporaryExpr *M
4179 = dyn_cast<MaterializeTemporaryExpr>(Val: this)) {
4180 return M->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4181 } else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Val: this)) {
4182 if (const Expr *Source = OVE->getSourceExpr())
4183 return Source->isNullPointerConstant(Ctx, NPC);
4184 }
4185
4186 // If the expression has no type information, it cannot be a null pointer
4187 // constant.
4188 if (getType().isNull())
4189 return NPCK_NotNull;
4190
4191 // C++11/C23 nullptr_t is always a null pointer constant.
4192 if (getType()->isNullPtrType())
4193 return NPCK_CXX11_nullptr;
4194
4195 if (const RecordType *UT = getType()->getAsUnionType())
4196 if (!Ctx.getLangOpts().CPlusPlus11 && UT &&
4197 UT->getDecl()->getMostRecentDecl()->hasAttr<TransparentUnionAttr>())
4198 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Val: this)){
4199 const Expr *InitExpr = CLE->getInitializer();
4200 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(Val: InitExpr))
4201 return ILE->getInit(Init: 0)->isNullPointerConstant(Ctx, NPC);
4202 }
4203 // This expression must be an integer type.
4204 if (!getType()->isIntegerType() ||
4205 (Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
4206 return NPCK_NotNull;
4207
4208 if (Ctx.getLangOpts().CPlusPlus11) {
4209 // C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
4210 // value zero or a prvalue of type std::nullptr_t.
4211 // Microsoft mode permits C++98 rules reflecting MSVC behavior.
4212 const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: this);
4213 if (Lit && !Lit->getValue())
4214 return NPCK_ZeroLiteral;
4215 if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
4216 return NPCK_NotNull;
4217 } else {
4218 // If we have an integer constant expression, we need to *evaluate* it and
4219 // test for the value 0.
4220 if (!isIntegerConstantExpr(Ctx))
4221 return NPCK_NotNull;
4222 }
4223
4224 if (EvaluateKnownConstInt(Ctx) != 0)
4225 return NPCK_NotNull;
4226
4227 if (isa<IntegerLiteral>(Val: this))
4228 return NPCK_ZeroLiteral;
4229 return NPCK_ZeroExpression;
4230}
4231
4232/// If this expression is an l-value for an Objective C
4233/// property, find the underlying property reference expression.
4234const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
4235 const Expr *E = this;
4236 while (true) {
4237 assert((E->isLValue() && E->getObjectKind() == OK_ObjCProperty) &&
4238 "expression is not a property reference");
4239 E = E->IgnoreParenCasts();
4240 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: E)) {
4241 if (BO->getOpcode() == BO_Comma) {
4242 E = BO->getRHS();
4243 continue;
4244 }
4245 }
4246
4247 break;
4248 }
4249
4250 return cast<ObjCPropertyRefExpr>(Val: E);
4251}
4252
4253bool Expr::isObjCSelfExpr() const {
4254 const Expr *E = IgnoreParenImpCasts();
4255
4256 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E);
4257 if (!DRE)
4258 return false;
4259
4260 const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(Val: DRE->getDecl());
4261 if (!Param)
4262 return false;
4263
4264 const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Val: Param->getDeclContext());
4265 if (!M)
4266 return false;
4267
4268 return M->getSelfDecl() == Param;
4269}
4270
4271FieldDecl *Expr::getSourceBitField() {
4272 Expr *E = this->IgnoreParens();
4273
4274 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4275 if (ICE->getCastKind() == CK_LValueToRValue ||
4276 (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp))
4277 E = ICE->getSubExpr()->IgnoreParens();
4278 else
4279 break;
4280 }
4281
4282 if (StmtExpr *SE = dyn_cast<StmtExpr>(Val: E)) {
4283 CompoundStmt *CS = SE->getSubStmt();
4284 if (ValueStmt *VS = dyn_cast_or_null<ValueStmt>(Val: CS->body_back()))
4285 if (Expr *EX = VS->getExprStmt())
4286 return EX->getSourceBitField();
4287 }
4288
4289 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(Val: E))
4290 if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: MemRef->getMemberDecl()))
4291 if (Field->isBitField())
4292 return Field;
4293
4294 if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(Val: E)) {
4295 FieldDecl *Ivar = IvarRef->getDecl();
4296 if (Ivar->isBitField())
4297 return Ivar;
4298 }
4299
4300 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(Val: E)) {
4301 if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: DeclRef->getDecl()))
4302 if (Field->isBitField())
4303 return Field;
4304
4305 if (BindingDecl *BD = dyn_cast<BindingDecl>(Val: DeclRef->getDecl()))
4306 if (Expr *E = BD->getBinding())
4307 return E->getSourceBitField();
4308 }
4309
4310 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Val: E)) {
4311 if (BinOp->isAssignmentOp() && BinOp->getLHS())
4312 return BinOp->getLHS()->getSourceBitField();
4313
4314 if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
4315 return BinOp->getRHS()->getSourceBitField();
4316 }
4317
4318 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Val: E))
4319 if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
4320 return UnOp->getSubExpr()->getSourceBitField();
4321
4322 return nullptr;
4323}
4324
4325EnumConstantDecl *Expr::getEnumConstantDecl() {
4326 Expr *E = this->IgnoreParenImpCasts();
4327 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4328 return dyn_cast<EnumConstantDecl>(Val: DRE->getDecl());
4329 return nullptr;
4330}
4331
4332bool Expr::refersToVectorElement() const {
4333 // FIXME: Why do we not just look at the ObjectKind here?
4334 const Expr *E = this->IgnoreParens();
4335
4336 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4337 if (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp)
4338 E = ICE->getSubExpr()->IgnoreParens();
4339 else
4340 break;
4341 }
4342
4343 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(Val: E))
4344 return ASE->getBase()->getType()->isVectorType();
4345
4346 if (isa<ExtVectorElementExpr>(Val: E))
4347 return true;
4348
4349 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4350 if (auto *BD = dyn_cast<BindingDecl>(Val: DRE->getDecl()))
4351 if (auto *E = BD->getBinding())
4352 return E->refersToVectorElement();
4353
4354 return false;
4355}
4356
4357bool Expr::refersToGlobalRegisterVar() const {
4358 const Expr *E = this->IgnoreParenImpCasts();
4359
4360 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E))
4361 if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
4362 if (VD->getStorageClass() == SC_Register &&
4363 VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
4364 return true;
4365
4366 return false;
4367}
4368
4369bool Expr::isSameComparisonOperand(const Expr* E1, const Expr* E2) {
4370 E1 = E1->IgnoreParens();
4371 E2 = E2->IgnoreParens();
4372
4373 if (E1->getStmtClass() != E2->getStmtClass())
4374 return false;
4375
4376 switch (E1->getStmtClass()) {
4377 default:
4378 return false;
4379 case CXXThisExprClass:
4380 return true;
4381 case DeclRefExprClass: {
4382 // DeclRefExpr without an ImplicitCastExpr can happen for integral
4383 // template parameters.
4384 const auto *DRE1 = cast<DeclRefExpr>(Val: E1);
4385 const auto *DRE2 = cast<DeclRefExpr>(Val: E2);
4386
4387 if (DRE1->getDecl() != DRE2->getDecl())
4388 return false;
4389
4390 if ((DRE1->isPRValue() && DRE2->isPRValue()) ||
4391 (DRE1->isLValue() && DRE2->isLValue()))
4392 return true;
4393
4394 return false;
4395 }
4396 case ImplicitCastExprClass: {
4397 // Peel off implicit casts.
4398 while (true) {
4399 const auto *ICE1 = dyn_cast<ImplicitCastExpr>(Val: E1);
4400 const auto *ICE2 = dyn_cast<ImplicitCastExpr>(Val: E2);
4401 if (!ICE1 || !ICE2)
4402 return false;
4403 if (ICE1->getCastKind() != ICE2->getCastKind())
4404 return isSameComparisonOperand(E1: ICE1->IgnoreParenImpCasts(),
4405 E2: ICE2->IgnoreParenImpCasts());
4406 E1 = ICE1->getSubExpr()->IgnoreParens();
4407 E2 = ICE2->getSubExpr()->IgnoreParens();
4408 // The final cast must be one of these types.
4409 if (ICE1->getCastKind() == CK_LValueToRValue ||
4410 ICE1->getCastKind() == CK_ArrayToPointerDecay ||
4411 ICE1->getCastKind() == CK_FunctionToPointerDecay) {
4412 break;
4413 }
4414 }
4415
4416 const auto *DRE1 = dyn_cast<DeclRefExpr>(Val: E1);
4417 const auto *DRE2 = dyn_cast<DeclRefExpr>(Val: E2);
4418 if (DRE1 && DRE2)
4419 return declaresSameEntity(D1: DRE1->getDecl(), D2: DRE2->getDecl());
4420
4421 const auto *Ivar1 = dyn_cast<ObjCIvarRefExpr>(Val: E1);
4422 const auto *Ivar2 = dyn_cast<ObjCIvarRefExpr>(Val: E2);
4423 if (Ivar1 && Ivar2) {
4424 return Ivar1->isFreeIvar() && Ivar2->isFreeIvar() &&
4425 declaresSameEntity(D1: Ivar1->getDecl(), D2: Ivar2->getDecl());
4426 }
4427
4428 const auto *Array1 = dyn_cast<ArraySubscriptExpr>(Val: E1);
4429 const auto *Array2 = dyn_cast<ArraySubscriptExpr>(Val: E2);
4430 if (Array1 && Array2) {
4431 if (!isSameComparisonOperand(E1: Array1->getBase(), E2: Array2->getBase()))
4432 return false;
4433
4434 auto Idx1 = Array1->getIdx();
4435 auto Idx2 = Array2->getIdx();
4436 const auto Integer1 = dyn_cast<IntegerLiteral>(Val: Idx1);
4437 const auto Integer2 = dyn_cast<IntegerLiteral>(Val: Idx2);
4438 if (Integer1 && Integer2) {
4439 if (!llvm::APInt::isSameValue(I1: Integer1->getValue(),
4440 I2: Integer2->getValue()))
4441 return false;
4442 } else {
4443 if (!isSameComparisonOperand(E1: Idx1, E2: Idx2))
4444 return false;
4445 }
4446
4447 return true;
4448 }
4449
4450 // Walk the MemberExpr chain.
4451 while (isa<MemberExpr>(Val: E1) && isa<MemberExpr>(Val: E2)) {
4452 const auto *ME1 = cast<MemberExpr>(Val: E1);
4453 const auto *ME2 = cast<MemberExpr>(Val: E2);
4454 if (!declaresSameEntity(D1: ME1->getMemberDecl(), D2: ME2->getMemberDecl()))
4455 return false;
4456 if (const auto *D = dyn_cast<VarDecl>(Val: ME1->getMemberDecl()))
4457 if (D->isStaticDataMember())
4458 return true;
4459 E1 = ME1->getBase()->IgnoreParenImpCasts();
4460 E2 = ME2->getBase()->IgnoreParenImpCasts();
4461 }
4462
4463 if (isa<CXXThisExpr>(Val: E1) && isa<CXXThisExpr>(Val: E2))
4464 return true;
4465
4466 // A static member variable can end the MemberExpr chain with either
4467 // a MemberExpr or a DeclRefExpr.
4468 auto getAnyDecl = [](const Expr *E) -> const ValueDecl * {
4469 if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4470 return DRE->getDecl();
4471 if (const auto *ME = dyn_cast<MemberExpr>(Val: E))
4472 return ME->getMemberDecl();
4473 return nullptr;
4474 };
4475
4476 const ValueDecl *VD1 = getAnyDecl(E1);
4477 const ValueDecl *VD2 = getAnyDecl(E2);
4478 return declaresSameEntity(D1: VD1, D2: VD2);
4479 }
4480 }
4481}
4482
4483/// isArrow - Return true if the base expression is a pointer to vector,
4484/// return false if the base expression is a vector.
4485bool ExtVectorElementExpr::isArrow() const {
4486 return getBase()->getType()->isPointerType();
4487}
4488
4489unsigned ExtVectorElementExpr::getNumElements() const {
4490 if (const VectorType *VT = getType()->getAs<VectorType>())
4491 return VT->getNumElements();
4492 return 1;
4493}
4494
4495unsigned MatrixElementExpr::getNumElements() const {
4496 if (const auto *MT = getType()->getAs<ConstantMatrixType>())
4497 return MT->getNumElementsFlattened();
4498 return 1;
4499}
4500
4501/// containsDuplicateElements - Return true if any Vector element access is
4502/// repeated.
4503bool ExtVectorElementExpr::containsDuplicateElements() const {
4504 // FIXME: Refactor this code to an accessor on the AST node which returns the
4505 // "type" of component access, and share with code below and in Sema.
4506 StringRef Comp = Accessor->getName();
4507
4508 // Halving swizzles do not contain duplicate elements.
4509 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
4510 return false;
4511
4512 // Advance past s-char prefix on hex swizzles.
4513 if (Comp[0] == 's' || Comp[0] == 'S')
4514 Comp = Comp.substr(Start: 1);
4515
4516 for (unsigned i = 0, e = Comp.size(); i != e; ++i)
4517 if (Comp.substr(Start: i + 1).contains(C: Comp[i]))
4518 return true;
4519
4520 return false;
4521}
4522
4523namespace {
4524struct MatrixAccessorFormat {
4525 bool IsZeroIndexed = false;
4526 unsigned ChunkLen = 0;
4527};
4528
4529static MatrixAccessorFormat GetHLSLMatrixAccessorFormat(StringRef Comp) {
4530 assert(!Comp.empty() && Comp[0] == '_' && "invalid matrix accessor");
4531
4532 MatrixAccessorFormat F;
4533 if (Comp.size() >= 2 && Comp[0] == '_' && Comp[1] == 'm') {
4534 F.IsZeroIndexed = true;
4535 F.ChunkLen = 4; // _mRC
4536 } else {
4537 F.IsZeroIndexed = false;
4538 F.ChunkLen = 3; // _RC
4539 }
4540
4541 assert(F.ChunkLen != 0 && "unrecognized matrix swizzle format");
4542 assert(Comp.size() % F.ChunkLen == 0 &&
4543 "matrix swizzle accessor has invalid length");
4544 return F;
4545}
4546
4547template <typename Fn>
4548static bool ForEachMatrixAccessorIndex(StringRef Comp,
4549 const ConstantMatrixType *MT, Fn &&F) {
4550 auto Format = GetHLSLMatrixAccessorFormat(Comp);
4551
4552 for (unsigned I = 0, E = Comp.size(); I < E; I += Format.ChunkLen) {
4553 unsigned Row = 0, Col = 0;
4554 unsigned ZeroIndexOffset = static_cast<unsigned>(Format.IsZeroIndexed);
4555 unsigned OneIndexOffset = static_cast<unsigned>(!Format.IsZeroIndexed);
4556 Row = static_cast<unsigned>(Comp[I + ZeroIndexOffset + 1] - '0') -
4557 OneIndexOffset;
4558 Col = static_cast<unsigned>(Comp[I + ZeroIndexOffset + 2] - '0') -
4559 OneIndexOffset;
4560
4561 assert(Row < MT->getNumRows() && Col < MT->getNumColumns() &&
4562 "matrix swizzle index out of bounds");
4563 // NOTE: AST layer has no access to LangOptions so we will default to row
4564 // major b\c all other AST matrix representations are row major.
4565 // However in codegen we need to convert to column major if the flag
4566 // requires it.
4567 const unsigned Index = MT->getFlattenedIndex(Row, Column: Col, /*IsRowMajor*/ true);
4568 // Callback returns true to continue, false to stop early.
4569 if (!F(Index))
4570 return false;
4571 }
4572 return true;
4573}
4574
4575} // namespace
4576
4577/// containsDuplicateElements - Return true if any Matrix element access is
4578/// repeated.
4579bool MatrixElementExpr::containsDuplicateElements() const {
4580 StringRef Comp = Accessor->getName();
4581 const auto *MT = getBase()->getType()->castAs<ConstantMatrixType>();
4582
4583 llvm::BitVector Seen(MT->getNumElementsFlattened(), /*t=*/false);
4584 bool HasDup = false;
4585 ForEachMatrixAccessorIndex(Comp, MT, F: [&](unsigned Index) -> bool {
4586 if (Seen[Index]) {
4587 HasDup = true;
4588 return false; // exit early
4589 }
4590 Seen.set(Index);
4591 return true;
4592 });
4593
4594 return HasDup;
4595}
4596
4597/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
4598void ExtVectorElementExpr::getEncodedElementAccess(
4599 SmallVectorImpl<uint32_t> &Elts) const {
4600 StringRef Comp = Accessor->getName();
4601 bool isNumericAccessor = false;
4602 if (Comp[0] == 's' || Comp[0] == 'S') {
4603 Comp = Comp.substr(Start: 1);
4604 isNumericAccessor = true;
4605 }
4606
4607 bool isHi = Comp == "hi";
4608 bool isLo = Comp == "lo";
4609 bool isEven = Comp == "even";
4610 bool isOdd = Comp == "odd";
4611
4612 for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
4613 uint64_t Index;
4614
4615 if (isHi)
4616 Index = e + i;
4617 else if (isLo)
4618 Index = i;
4619 else if (isEven)
4620 Index = 2 * i;
4621 else if (isOdd)
4622 Index = 2 * i + 1;
4623 else
4624 Index = ExtVectorType::getAccessorIdx(c: Comp[i], isNumericAccessor);
4625
4626 Elts.push_back(Elt: Index);
4627 }
4628}
4629
4630void MatrixElementExpr::getEncodedElementAccess(
4631 SmallVectorImpl<uint32_t> &Elts) const {
4632 StringRef Comp = Accessor->getName();
4633 const auto *MT = getBase()->getType()->castAs<ConstantMatrixType>();
4634 ForEachMatrixAccessorIndex(Comp, MT, F: [&](unsigned Index) -> bool {
4635 Elts.push_back(Elt: Index);
4636 return true;
4637 });
4638}
4639
4640ShuffleVectorExpr::ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr *> args,
4641 QualType Type, SourceLocation BLoc,
4642 SourceLocation RP)
4643 : Expr(ShuffleVectorExprClass, Type, VK_PRValue, OK_Ordinary),
4644 BuiltinLoc(BLoc), RParenLoc(RP) {
4645 ShuffleVectorExprBits.NumExprs = args.size();
4646 SubExprs = new (C) Stmt*[args.size()];
4647 for (unsigned i = 0; i != args.size(); i++)
4648 SubExprs[i] = args[i];
4649
4650 setDependence(computeDependence(E: this));
4651}
4652
4653void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
4654 if (SubExprs) C.Deallocate(Ptr: SubExprs);
4655
4656 this->ShuffleVectorExprBits.NumExprs = Exprs.size();
4657 SubExprs = new (C) Stmt *[ShuffleVectorExprBits.NumExprs];
4658 llvm::copy(Range&: Exprs, Out: SubExprs);
4659}
4660
4661GenericSelectionExpr::GenericSelectionExpr(
4662 const ASTContext &, SourceLocation GenericLoc, Expr *ControllingExpr,
4663 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4664 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4665 bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
4666 : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4667 AssocExprs[ResultIndex]->getValueKind(),
4668 AssocExprs[ResultIndex]->getObjectKind()),
4669 NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4670 IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4671 assert(AssocTypes.size() == AssocExprs.size() &&
4672 "Must have the same number of association expressions"
4673 " and TypeSourceInfo!");
4674 assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4675
4676 GenericSelectionExprBits.GenericLoc = GenericLoc;
4677 getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4678 ControllingExpr;
4679 llvm::copy(Range&: AssocExprs,
4680 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4681 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4682 getIndexOfStartOfAssociatedTypes());
4683
4684 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4685}
4686
4687GenericSelectionExpr::GenericSelectionExpr(
4688 const ASTContext &, SourceLocation GenericLoc,
4689 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4690 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4691 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4692 unsigned ResultIndex)
4693 : Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4694 AssocExprs[ResultIndex]->getValueKind(),
4695 AssocExprs[ResultIndex]->getObjectKind()),
4696 NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4697 IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4698 assert(AssocTypes.size() == AssocExprs.size() &&
4699 "Must have the same number of association expressions"
4700 " and TypeSourceInfo!");
4701 assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4702
4703 GenericSelectionExprBits.GenericLoc = GenericLoc;
4704 getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4705 ControllingType;
4706 llvm::copy(Range&: AssocExprs,
4707 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4708 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4709 getIndexOfStartOfAssociatedTypes());
4710
4711 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4712}
4713
4714GenericSelectionExpr::GenericSelectionExpr(
4715 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4716 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4717 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4718 bool ContainsUnexpandedParameterPack)
4719 : Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4720 OK_Ordinary),
4721 NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4722 IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4723 assert(AssocTypes.size() == AssocExprs.size() &&
4724 "Must have the same number of association expressions"
4725 " and TypeSourceInfo!");
4726
4727 GenericSelectionExprBits.GenericLoc = GenericLoc;
4728 getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4729 ControllingExpr;
4730 llvm::copy(Range&: AssocExprs,
4731 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4732 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4733 getIndexOfStartOfAssociatedTypes());
4734
4735 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4736}
4737
4738GenericSelectionExpr::GenericSelectionExpr(
4739 const ASTContext &Context, SourceLocation GenericLoc,
4740 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4741 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4742 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack)
4743 : Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4744 OK_Ordinary),
4745 NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4746 IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4747 assert(AssocTypes.size() == AssocExprs.size() &&
4748 "Must have the same number of association expressions"
4749 " and TypeSourceInfo!");
4750
4751 GenericSelectionExprBits.GenericLoc = GenericLoc;
4752 getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4753 ControllingType;
4754 llvm::copy(Range&: AssocExprs,
4755 Out: getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4756 llvm::copy(Range&: AssocTypes, Out: getTrailingObjects<TypeSourceInfo *>() +
4757 getIndexOfStartOfAssociatedTypes());
4758
4759 setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4760}
4761
4762GenericSelectionExpr::GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs)
4763 : Expr(GenericSelectionExprClass, Empty), NumAssocs(NumAssocs) {}
4764
4765GenericSelectionExpr *GenericSelectionExpr::Create(
4766 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4767 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4768 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4769 bool ContainsUnexpandedParameterPack, unsigned ResultIndex) {
4770 unsigned NumAssocs = AssocExprs.size();
4771 void *Mem = Context.Allocate(
4772 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4773 Align: alignof(GenericSelectionExpr));
4774 return new (Mem) GenericSelectionExpr(
4775 Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4776 RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4777}
4778
4779GenericSelectionExpr *GenericSelectionExpr::Create(
4780 const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4781 ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4782 SourceLocation DefaultLoc, SourceLocation RParenLoc,
4783 bool ContainsUnexpandedParameterPack) {
4784 unsigned NumAssocs = AssocExprs.size();
4785 void *Mem = Context.Allocate(
4786 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4787 Align: alignof(GenericSelectionExpr));
4788 return new (Mem) GenericSelectionExpr(
4789 Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4790 RParenLoc, ContainsUnexpandedParameterPack);
4791}
4792
4793GenericSelectionExpr *GenericSelectionExpr::Create(
4794 const ASTContext &Context, SourceLocation GenericLoc,
4795 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4796 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4797 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4798 unsigned ResultIndex) {
4799 unsigned NumAssocs = AssocExprs.size();
4800 void *Mem = Context.Allocate(
4801 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4802 Align: alignof(GenericSelectionExpr));
4803 return new (Mem) GenericSelectionExpr(
4804 Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4805 RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4806}
4807
4808GenericSelectionExpr *GenericSelectionExpr::Create(
4809 const ASTContext &Context, SourceLocation GenericLoc,
4810 TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4811 ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4812 SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack) {
4813 unsigned NumAssocs = AssocExprs.size();
4814 void *Mem = Context.Allocate(
4815 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4816 Align: alignof(GenericSelectionExpr));
4817 return new (Mem) GenericSelectionExpr(
4818 Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4819 RParenLoc, ContainsUnexpandedParameterPack);
4820}
4821
4822GenericSelectionExpr *
4823GenericSelectionExpr::CreateEmpty(const ASTContext &Context,
4824 unsigned NumAssocs) {
4825 void *Mem = Context.Allocate(
4826 Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4827 Align: alignof(GenericSelectionExpr));
4828 return new (Mem) GenericSelectionExpr(EmptyShell(), NumAssocs);
4829}
4830
4831//===----------------------------------------------------------------------===//
4832// DesignatedInitExpr
4833//===----------------------------------------------------------------------===//
4834
4835const IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
4836 assert(isFieldDesignator() && "Only valid on a field designator");
4837 if (FieldInfo.NameOrField & 0x01)
4838 return reinterpret_cast<IdentifierInfo *>(FieldInfo.NameOrField & ~0x01);
4839 return getFieldDecl()->getIdentifier();
4840}
4841
4842DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
4843 ArrayRef<Designator> Designators,
4844 SourceLocation EqualOrColonLoc,
4845 bool GNUSyntax,
4846 ArrayRef<Expr *> IndexExprs, Expr *Init)
4847 : Expr(DesignatedInitExprClass, Ty, Init->getValueKind(),
4848 Init->getObjectKind()),
4849 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
4850 NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
4851 this->Designators = new (C) Designator[NumDesignators];
4852
4853 // Record the initializer itself.
4854 child_iterator Child = child_begin();
4855 *Child++ = Init;
4856
4857 // Copy the designators and their subexpressions, computing
4858 // value-dependence along the way.
4859 unsigned IndexIdx = 0;
4860 for (unsigned I = 0; I != NumDesignators; ++I) {
4861 this->Designators[I] = Designators[I];
4862 if (this->Designators[I].isArrayDesignator()) {
4863 // Copy the index expressions into permanent storage.
4864 *Child++ = IndexExprs[IndexIdx++];
4865 } else if (this->Designators[I].isArrayRangeDesignator()) {
4866 // Copy the start/end expressions into permanent storage.
4867 *Child++ = IndexExprs[IndexIdx++];
4868 *Child++ = IndexExprs[IndexIdx++];
4869 }
4870 }
4871
4872 assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions");
4873 setDependence(computeDependence(E: this));
4874}
4875
4876DesignatedInitExpr *DesignatedInitExpr::Create(const ASTContext &C,
4877 ArrayRef<Designator> Designators,
4878 ArrayRef<Expr *> IndexExprs,
4879 SourceLocation ColonOrEqualLoc,
4880 bool UsesColonSyntax,
4881 Expr *Init) {
4882 void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: IndexExprs.size() + 1),
4883 Align: alignof(DesignatedInitExpr));
4884 return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
4885 ColonOrEqualLoc, UsesColonSyntax,
4886 IndexExprs, Init);
4887}
4888
4889DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(const ASTContext &C,
4890 unsigned NumIndexExprs) {
4891 void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumIndexExprs + 1),
4892 Align: alignof(DesignatedInitExpr));
4893 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
4894}
4895
4896void DesignatedInitExpr::setDesignators(const ASTContext &C,
4897 const Designator *Desigs,
4898 unsigned NumDesigs) {
4899 Designators = new (C) Designator[NumDesigs];
4900 NumDesignators = NumDesigs;
4901 for (unsigned I = 0; I != NumDesigs; ++I)
4902 Designators[I] = Desigs[I];
4903}
4904
4905SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
4906 DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
4907 if (size() == 1)
4908 return DIE->getDesignator(Idx: 0)->getSourceRange();
4909 return SourceRange(DIE->getDesignator(Idx: 0)->getBeginLoc(),
4910 DIE->getDesignator(Idx: size() - 1)->getEndLoc());
4911}
4912
4913SourceLocation DesignatedInitExpr::getBeginLoc() const {
4914 auto *DIE = const_cast<DesignatedInitExpr *>(this);
4915 Designator &First = *DIE->getDesignator(Idx: 0);
4916 if (First.isFieldDesignator()) {
4917 // Skip past implicit designators for anonymous structs/unions, since
4918 // these do not have valid source locations.
4919 for (unsigned int i = 0; i < DIE->size(); i++) {
4920 Designator &Des = *DIE->getDesignator(Idx: i);
4921 SourceLocation retval = GNUSyntax ? Des.getFieldLoc() : Des.getDotLoc();
4922 if (!retval.isValid())
4923 continue;
4924 return retval;
4925 }
4926 }
4927 return First.getLBracketLoc();
4928}
4929
4930SourceLocation DesignatedInitExpr::getEndLoc() const {
4931 return getInit()->getEndLoc();
4932}
4933
4934Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) const {
4935 assert(D.isArrayDesignator() && "Requires array designator");
4936 return getSubExpr(Idx: D.getArrayIndex() + 1);
4937}
4938
4939Expr *DesignatedInitExpr::getArrayRangeStart(const Designator &D) const {
4940 assert(D.isArrayRangeDesignator() && "Requires array range designator");
4941 return getSubExpr(Idx: D.getArrayIndex() + 1);
4942}
4943
4944Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator &D) const {
4945 assert(D.isArrayRangeDesignator() && "Requires array range designator");
4946 return getSubExpr(Idx: D.getArrayIndex() + 2);
4947}
4948
4949/// Replaces the designator at index @p Idx with the series
4950/// of designators in [First, Last).
4951void DesignatedInitExpr::ExpandDesignator(const ASTContext &C, unsigned Idx,
4952 const Designator *First,
4953 const Designator *Last) {
4954 unsigned NumNewDesignators = Last - First;
4955 if (NumNewDesignators == 0) {
4956 std::copy_backward(first: Designators + Idx + 1,
4957 last: Designators + NumDesignators,
4958 result: Designators + Idx);
4959 --NumNewDesignators;
4960 return;
4961 }
4962 if (NumNewDesignators == 1) {
4963 Designators[Idx] = *First;
4964 return;
4965 }
4966
4967 Designator *NewDesignators
4968 = new (C) Designator[NumDesignators - 1 + NumNewDesignators];
4969 std::copy(first: Designators, last: Designators + Idx, result: NewDesignators);
4970 std::copy(first: First, last: Last, result: NewDesignators + Idx);
4971 std::copy(first: Designators + Idx + 1, last: Designators + NumDesignators,
4972 result: NewDesignators + Idx + NumNewDesignators);
4973 Designators = NewDesignators;
4974 NumDesignators = NumDesignators - 1 + NumNewDesignators;
4975}
4976
4977DesignatedInitUpdateExpr::DesignatedInitUpdateExpr(const ASTContext &C,
4978 SourceLocation lBraceLoc,
4979 Expr *baseExpr,
4980 SourceLocation rBraceLoc)
4981 : Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_PRValue,
4982 OK_Ordinary) {
4983 BaseAndUpdaterExprs[0] = baseExpr;
4984
4985 InitListExpr *ILE =
4986 new (C) InitListExpr(C, lBraceLoc, {}, rBraceLoc, /*isExplicit=*/false);
4987 ILE->setType(baseExpr->getType());
4988 BaseAndUpdaterExprs[1] = ILE;
4989
4990 // FIXME: this is wrong, set it correctly.
4991 setDependence(ExprDependence::None);
4992}
4993
4994SourceLocation DesignatedInitUpdateExpr::getBeginLoc() const {
4995 return getBase()->getBeginLoc();
4996}
4997
4998SourceLocation DesignatedInitUpdateExpr::getEndLoc() const {
4999 return getBase()->getEndLoc();
5000}
5001
5002ParenListExpr::ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
5003 SourceLocation RParenLoc)
5004 : Expr(ParenListExprClass, QualType(), VK_PRValue, OK_Ordinary),
5005 LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
5006 ParenListExprBits.NumExprs = Exprs.size();
5007 llvm::copy(Range&: Exprs, Out: getTrailingObjects());
5008 setDependence(computeDependence(E: this));
5009}
5010
5011ParenListExpr::ParenListExpr(EmptyShell Empty, unsigned NumExprs)
5012 : Expr(ParenListExprClass, Empty) {
5013 ParenListExprBits.NumExprs = NumExprs;
5014}
5015
5016ParenListExpr *ParenListExpr::Create(const ASTContext &Ctx,
5017 SourceLocation LParenLoc,
5018 ArrayRef<Expr *> Exprs,
5019 SourceLocation RParenLoc) {
5020 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: Exprs.size()),
5021 Align: alignof(ParenListExpr));
5022 return new (Mem) ParenListExpr(LParenLoc, Exprs, RParenLoc);
5023}
5024
5025ParenListExpr *ParenListExpr::CreateEmpty(const ASTContext &Ctx,
5026 unsigned NumExprs) {
5027 void *Mem =
5028 Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumExprs), Align: alignof(ParenListExpr));
5029 return new (Mem) ParenListExpr(EmptyShell(), NumExprs);
5030}
5031
5032/// Certain overflow-dependent code patterns can have their integer overflow
5033/// sanitization disabled. Check for the common pattern `if (a + b < a)` and
5034/// return the resulting BinaryOperator responsible for the addition so we can
5035/// elide overflow checks during codegen.
5036static std::optional<BinaryOperator *>
5037getOverflowPatternBinOp(const BinaryOperator *E) {
5038 Expr *Addition, *ComparedTo;
5039 if (E->getOpcode() == BO_LT) {
5040 Addition = E->getLHS();
5041 ComparedTo = E->getRHS();
5042 } else if (E->getOpcode() == BO_GT) {
5043 Addition = E->getRHS();
5044 ComparedTo = E->getLHS();
5045 } else {
5046 return {};
5047 }
5048
5049 const Expr *AddLHS = nullptr, *AddRHS = nullptr;
5050 BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: Addition);
5051
5052 if (BO && BO->getOpcode() == clang::BO_Add) {
5053 // now store addends for lookup on other side of '>'
5054 AddLHS = BO->getLHS();
5055 AddRHS = BO->getRHS();
5056 }
5057
5058 if (!AddLHS || !AddRHS)
5059 return {};
5060
5061 const Decl *LHSDecl, *RHSDecl, *OtherDecl;
5062
5063 LHSDecl = AddLHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5064 RHSDecl = AddRHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5065 OtherDecl = ComparedTo->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
5066
5067 if (!OtherDecl)
5068 return {};
5069
5070 if (!LHSDecl && !RHSDecl)
5071 return {};
5072
5073 if ((LHSDecl && LHSDecl == OtherDecl && LHSDecl != RHSDecl) ||
5074 (RHSDecl && RHSDecl == OtherDecl && RHSDecl != LHSDecl))
5075 return BO;
5076 return {};
5077}
5078
5079/// Compute and set the OverflowPatternExclusion bit based on whether the
5080/// BinaryOperator expression matches an overflow pattern being ignored by
5081/// -fsanitize-undefined-ignore-overflow-pattern=add-signed-overflow-test or
5082/// -fsanitize-undefined-ignore-overflow-pattern=add-unsigned-overflow-test
5083static void computeOverflowPatternExclusion(const ASTContext &Ctx,
5084 const BinaryOperator *E) {
5085 std::optional<BinaryOperator *> Result = getOverflowPatternBinOp(E);
5086 if (!Result.has_value())
5087 return;
5088 QualType AdditionResultType = Result.value()->getType();
5089
5090 if ((AdditionResultType->isSignedIntegerType() &&
5091 Ctx.getLangOpts().isOverflowPatternExcluded(
5092 Kind: LangOptions::OverflowPatternExclusionKind::AddSignedOverflowTest)) ||
5093 (AdditionResultType->isUnsignedIntegerType() &&
5094 Ctx.getLangOpts().isOverflowPatternExcluded(
5095 Kind: LangOptions::OverflowPatternExclusionKind::AddUnsignedOverflowTest)))
5096 Result.value()->setExcludedOverflowPattern(true);
5097}
5098
5099BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
5100 Opcode opc, QualType ResTy, ExprValueKind VK,
5101 ExprObjectKind OK, SourceLocation opLoc,
5102 FPOptionsOverride FPFeatures)
5103 : Expr(BinaryOperatorClass, ResTy, VK, OK) {
5104 BinaryOperatorBits.Opc = opc;
5105 assert(!isCompoundAssignmentOp() &&
5106 "Use CompoundAssignOperator for compound assignments");
5107 BinaryOperatorBits.OpLoc = opLoc;
5108 BinaryOperatorBits.ExcludedOverflowPattern = false;
5109 SubExprs[LHS] = lhs;
5110 SubExprs[RHS] = rhs;
5111 computeOverflowPatternExclusion(Ctx, E: this);
5112 BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5113 if (hasStoredFPFeatures())
5114 setStoredFPFeatures(FPFeatures);
5115 setDependence(computeDependence(E: this));
5116}
5117
5118BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
5119 Opcode opc, QualType ResTy, ExprValueKind VK,
5120 ExprObjectKind OK, SourceLocation opLoc,
5121 FPOptionsOverride FPFeatures, bool dead2)
5122 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK) {
5123 BinaryOperatorBits.Opc = opc;
5124 BinaryOperatorBits.ExcludedOverflowPattern = false;
5125 assert(isCompoundAssignmentOp() &&
5126 "Use CompoundAssignOperator for compound assignments");
5127 BinaryOperatorBits.OpLoc = opLoc;
5128 SubExprs[LHS] = lhs;
5129 SubExprs[RHS] = rhs;
5130 BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5131 if (hasStoredFPFeatures())
5132 setStoredFPFeatures(FPFeatures);
5133 setDependence(computeDependence(E: this));
5134}
5135
5136BinaryOperator *BinaryOperator::CreateEmpty(const ASTContext &C,
5137 bool HasFPFeatures) {
5138 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5139 void *Mem =
5140 C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
5141 return new (Mem) BinaryOperator(EmptyShell());
5142}
5143
5144BinaryOperator *BinaryOperator::Create(const ASTContext &C, Expr *lhs,
5145 Expr *rhs, Opcode opc, QualType ResTy,
5146 ExprValueKind VK, ExprObjectKind OK,
5147 SourceLocation opLoc,
5148 FPOptionsOverride FPFeatures) {
5149 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5150 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5151 void *Mem =
5152 C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
5153 return new (Mem)
5154 BinaryOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures);
5155}
5156
5157CompoundAssignOperator *
5158CompoundAssignOperator::CreateEmpty(const ASTContext &C, bool HasFPFeatures) {
5159 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5160 void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
5161 Align: alignof(CompoundAssignOperator));
5162 return new (Mem) CompoundAssignOperator(C, EmptyShell(), HasFPFeatures);
5163}
5164
5165CompoundAssignOperator *
5166CompoundAssignOperator::Create(const ASTContext &C, Expr *lhs, Expr *rhs,
5167 Opcode opc, QualType ResTy, ExprValueKind VK,
5168 ExprObjectKind OK, SourceLocation opLoc,
5169 FPOptionsOverride FPFeatures,
5170 QualType CompLHSType, QualType CompResultType) {
5171 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5172 unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
5173 void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
5174 Align: alignof(CompoundAssignOperator));
5175 return new (Mem)
5176 CompoundAssignOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures,
5177 CompLHSType, CompResultType);
5178}
5179
5180UnaryOperator *UnaryOperator::CreateEmpty(const ASTContext &C,
5181 bool hasFPFeatures) {
5182 void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
5183 Align: alignof(UnaryOperator));
5184 return new (Mem) UnaryOperator(hasFPFeatures, EmptyShell());
5185}
5186
5187UnaryOperator::UnaryOperator(const ASTContext &Ctx, Expr *input, Opcode opc,
5188 QualType type, ExprValueKind VK, ExprObjectKind OK,
5189 SourceLocation l, bool CanOverflow,
5190 FPOptionsOverride FPFeatures)
5191 : Expr(UnaryOperatorClass, type, VK, OK), Val(input) {
5192 UnaryOperatorBits.Opc = opc;
5193 UnaryOperatorBits.CanOverflow = CanOverflow;
5194 UnaryOperatorBits.Loc = l;
5195 UnaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
5196 if (hasStoredFPFeatures())
5197 setStoredFPFeatures(FPFeatures);
5198 setDependence(computeDependence(E: this, Ctx));
5199}
5200
5201UnaryOperator *UnaryOperator::Create(const ASTContext &C, Expr *input,
5202 Opcode opc, QualType type,
5203 ExprValueKind VK, ExprObjectKind OK,
5204 SourceLocation l, bool CanOverflow,
5205 FPOptionsOverride FPFeatures) {
5206 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5207 unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
5208 void *Mem = C.Allocate(Size, Align: alignof(UnaryOperator));
5209 return new (Mem)
5210 UnaryOperator(C, input, opc, type, VK, OK, l, CanOverflow, FPFeatures);
5211}
5212
5213const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
5214 if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(Val: e))
5215 e = ewc->getSubExpr();
5216 if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(Val: e))
5217 e = m->getSubExpr();
5218 e = cast<CXXConstructExpr>(Val: e)->getArg(Arg: 0);
5219 while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(Val: e))
5220 e = ice->getSubExpr();
5221 return cast<OpaqueValueExpr>(Val: e);
5222}
5223
5224PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &Context,
5225 EmptyShell sh,
5226 unsigned numSemanticExprs) {
5227 void *buffer =
5228 Context.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: 1 + numSemanticExprs),
5229 Align: alignof(PseudoObjectExpr));
5230 return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
5231}
5232
5233PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
5234 : Expr(PseudoObjectExprClass, shell) {
5235 PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
5236}
5237
5238PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &C, Expr *syntax,
5239 ArrayRef<Expr*> semantics,
5240 unsigned resultIndex) {
5241 assert(syntax && "no syntactic expression!");
5242 assert(semantics.size() && "no semantic expressions!");
5243
5244 QualType type;
5245 ExprValueKind VK;
5246 if (resultIndex == NoResult) {
5247 type = C.VoidTy;
5248 VK = VK_PRValue;
5249 } else {
5250 assert(resultIndex < semantics.size());
5251 type = semantics[resultIndex]->getType();
5252 VK = semantics[resultIndex]->getValueKind();
5253 assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary);
5254 }
5255
5256 void *buffer = C.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: semantics.size() + 1),
5257 Align: alignof(PseudoObjectExpr));
5258 return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
5259 resultIndex);
5260}
5261
5262PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
5263 Expr *syntax, ArrayRef<Expr *> semantics,
5264 unsigned resultIndex)
5265 : Expr(PseudoObjectExprClass, type, VK, OK_Ordinary) {
5266 PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
5267 PseudoObjectExprBits.ResultIndex = resultIndex + 1;
5268 MutableArrayRef<Expr *> Trail = getTrailingObjects(N: semantics.size() + 1);
5269 Trail[0] = syntax;
5270
5271 assert(llvm::all_of(semantics,
5272 [](const Expr *E) {
5273 return !isa<OpaqueValueExpr>(E) ||
5274 cast<OpaqueValueExpr>(E)->getSourceExpr() !=
5275 nullptr;
5276 }) &&
5277 "opaque-value semantic expressions for pseudo-object "
5278 "operations must have sources");
5279
5280 llvm::copy(Range&: semantics, Out: Trail.drop_front().begin());
5281 setDependence(computeDependence(E: this));
5282}
5283
5284//===----------------------------------------------------------------------===//
5285// Child Iterators for iterating over subexpressions/substatements
5286//===----------------------------------------------------------------------===//
5287
5288// UnaryExprOrTypeTraitExpr
5289Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
5290 const_child_range CCR =
5291 const_cast<const UnaryExprOrTypeTraitExpr *>(this)->children();
5292 return child_range(cast_away_const(RHS: CCR.begin()), cast_away_const(RHS: CCR.end()));
5293}
5294
5295Stmt::const_child_range UnaryExprOrTypeTraitExpr::children() const {
5296 // If this is of a type and the type is a VLA type (and not a typedef), the
5297 // size expression of the VLA needs to be treated as an executable expression.
5298 // Why isn't this weirdness documented better in StmtIterator?
5299 if (isArgumentType()) {
5300 if (const VariableArrayType *T =
5301 dyn_cast<VariableArrayType>(Val: getArgumentType().getTypePtr()))
5302 return const_child_range(const_child_iterator(T), const_child_iterator());
5303 return const_child_range(const_child_iterator(), const_child_iterator());
5304 }
5305 return const_child_range(&Argument.Ex, &Argument.Ex + 1);
5306}
5307
5308AtomicExpr::AtomicExpr(SourceLocation BLoc, ArrayRef<Expr *> args, QualType t,
5309 AtomicOp op, SourceLocation RP)
5310 : Expr(AtomicExprClass, t, VK_PRValue, OK_Ordinary),
5311 NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) {
5312 assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions");
5313 for (unsigned i = 0; i != args.size(); i++)
5314 SubExprs[i] = args[i];
5315 setDependence(computeDependence(E: this));
5316}
5317
5318unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) {
5319 switch (Op) {
5320 case AO__c11_atomic_init:
5321 case AO__opencl_atomic_init:
5322 case AO__c11_atomic_load:
5323 case AO__atomic_load_n:
5324 case AO__atomic_test_and_set:
5325 case AO__atomic_clear:
5326 return 2;
5327
5328 case AO__scoped_atomic_load_n:
5329 case AO__opencl_atomic_load:
5330 case AO__hip_atomic_load:
5331 case AO__c11_atomic_store:
5332 case AO__c11_atomic_exchange:
5333 case AO__atomic_load:
5334 case AO__atomic_store:
5335 case AO__atomic_store_n:
5336 case AO__atomic_exchange_n:
5337 case AO__c11_atomic_fetch_add:
5338 case AO__c11_atomic_fetch_sub:
5339 case AO__c11_atomic_fetch_and:
5340 case AO__c11_atomic_fetch_or:
5341 case AO__c11_atomic_fetch_xor:
5342 case AO__c11_atomic_fetch_nand:
5343 case AO__c11_atomic_fetch_max:
5344 case AO__c11_atomic_fetch_min:
5345 case AO__atomic_fetch_add:
5346 case AO__atomic_fetch_sub:
5347 case AO__atomic_fetch_and:
5348 case AO__atomic_fetch_or:
5349 case AO__atomic_fetch_xor:
5350 case AO__atomic_fetch_nand:
5351 case AO__atomic_add_fetch:
5352 case AO__atomic_sub_fetch:
5353 case AO__atomic_and_fetch:
5354 case AO__atomic_or_fetch:
5355 case AO__atomic_xor_fetch:
5356 case AO__atomic_nand_fetch:
5357 case AO__atomic_min_fetch:
5358 case AO__atomic_max_fetch:
5359 case AO__atomic_fetch_min:
5360 case AO__atomic_fetch_max:
5361 case AO__atomic_fetch_fminimum:
5362 case AO__atomic_fetch_fmaximum:
5363 case AO__atomic_fetch_fminimum_num:
5364 case AO__atomic_fetch_fmaximum_num:
5365 case AO__atomic_fetch_uinc:
5366 case AO__atomic_fetch_udec:
5367 return 3;
5368
5369 case AO__scoped_atomic_load:
5370 case AO__scoped_atomic_store:
5371 case AO__scoped_atomic_store_n:
5372 case AO__scoped_atomic_fetch_add:
5373 case AO__scoped_atomic_fetch_sub:
5374 case AO__scoped_atomic_fetch_and:
5375 case AO__scoped_atomic_fetch_or:
5376 case AO__scoped_atomic_fetch_xor:
5377 case AO__scoped_atomic_fetch_nand:
5378 case AO__scoped_atomic_add_fetch:
5379 case AO__scoped_atomic_sub_fetch:
5380 case AO__scoped_atomic_and_fetch:
5381 case AO__scoped_atomic_or_fetch:
5382 case AO__scoped_atomic_xor_fetch:
5383 case AO__scoped_atomic_nand_fetch:
5384 case AO__scoped_atomic_min_fetch:
5385 case AO__scoped_atomic_max_fetch:
5386 case AO__scoped_atomic_fetch_min:
5387 case AO__scoped_atomic_fetch_max:
5388 case AO__scoped_atomic_fetch_fminimum:
5389 case AO__scoped_atomic_fetch_fmaximum:
5390 case AO__scoped_atomic_fetch_fminimum_num:
5391 case AO__scoped_atomic_fetch_fmaximum_num:
5392 case AO__scoped_atomic_exchange_n:
5393 case AO__scoped_atomic_fetch_uinc:
5394 case AO__scoped_atomic_fetch_udec:
5395 case AO__hip_atomic_exchange:
5396 case AO__hip_atomic_fetch_add:
5397 case AO__hip_atomic_fetch_sub:
5398 case AO__hip_atomic_fetch_and:
5399 case AO__hip_atomic_fetch_or:
5400 case AO__hip_atomic_fetch_xor:
5401 case AO__hip_atomic_fetch_min:
5402 case AO__hip_atomic_fetch_max:
5403 case AO__opencl_atomic_store:
5404 case AO__hip_atomic_store:
5405 case AO__opencl_atomic_exchange:
5406 case AO__opencl_atomic_fetch_add:
5407 case AO__opencl_atomic_fetch_sub:
5408 case AO__opencl_atomic_fetch_and:
5409 case AO__opencl_atomic_fetch_or:
5410 case AO__opencl_atomic_fetch_xor:
5411 case AO__opencl_atomic_fetch_min:
5412 case AO__opencl_atomic_fetch_max:
5413 case AO__atomic_exchange:
5414 return 4;
5415
5416 case AO__scoped_atomic_exchange:
5417 case AO__c11_atomic_compare_exchange_strong:
5418 case AO__c11_atomic_compare_exchange_weak:
5419 return 5;
5420 case AO__hip_atomic_compare_exchange_strong:
5421 case AO__opencl_atomic_compare_exchange_strong:
5422 case AO__opencl_atomic_compare_exchange_weak:
5423 case AO__hip_atomic_compare_exchange_weak:
5424 case AO__atomic_compare_exchange:
5425 case AO__atomic_compare_exchange_n:
5426 return 6;
5427
5428 case AO__scoped_atomic_compare_exchange:
5429 case AO__scoped_atomic_compare_exchange_n:
5430 return 7;
5431 }
5432 llvm_unreachable("unknown atomic op");
5433}
5434
5435QualType AtomicExpr::getValueType() const {
5436 auto T = getPtr()->getType()->castAs<PointerType>()->getPointeeType();
5437 if (auto AT = T->getAs<AtomicType>())
5438 return AT->getValueType();
5439 return T;
5440}
5441
5442QualType ArraySectionExpr::getBaseOriginalType(const Expr *Base) {
5443 unsigned ArraySectionCount = 0;
5444 while (auto *OASE = dyn_cast<ArraySectionExpr>(Val: Base->IgnoreParens())) {
5445 Base = OASE->getBase();
5446 ++ArraySectionCount;
5447 }
5448 while (auto *ASE =
5449 dyn_cast<ArraySubscriptExpr>(Val: Base->IgnoreParenImpCasts())) {
5450 Base = ASE->getBase();
5451 ++ArraySectionCount;
5452 }
5453 Base = Base->IgnoreParenImpCasts();
5454 auto OriginalTy = Base->getType();
5455 if (auto *DRE = dyn_cast<DeclRefExpr>(Val: Base))
5456 if (auto *PVD = dyn_cast<ParmVarDecl>(Val: DRE->getDecl()))
5457 OriginalTy = PVD->getOriginalType().getNonReferenceType();
5458
5459 for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
5460 if (OriginalTy->isAnyPointerType())
5461 OriginalTy = OriginalTy->getPointeeType();
5462 else if (OriginalTy->isArrayType())
5463 OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
5464 else
5465 return {};
5466 }
5467 return OriginalTy;
5468}
5469
5470QualType ArraySectionExpr::getElementType() const {
5471 QualType BaseTy = getBase()->IgnoreParenImpCasts()->getType();
5472 // We only have to look into the array section exprs, else we will get the
5473 // type of the base, which should already be valid.
5474 if (auto *ASE = dyn_cast<ArraySectionExpr>(Val: getBase()->IgnoreParenImpCasts()))
5475 BaseTy = ASE->getElementType();
5476
5477 if (BaseTy->isAnyPointerType())
5478 return BaseTy->getPointeeType();
5479 if (BaseTy->isArrayType())
5480 return BaseTy->castAsArrayTypeUnsafe()->getElementType();
5481
5482 // If this isn't a pointer or array, the base is a dependent expression, so
5483 // just return the BaseTy anyway.
5484 assert(BaseTy->isInstantiationDependentType());
5485 return BaseTy;
5486}
5487
5488QualType ArraySectionExpr::getBaseType() const {
5489 // We only have to look into the array section exprs, else we will get the
5490 // type of the base, which should already be valid.
5491 if (auto *ASE = dyn_cast<ArraySectionExpr>(Val: getBase()->IgnoreParenImpCasts()))
5492 return ASE->getElementType();
5493
5494 return getBase()->IgnoreParenImpCasts()->getType();
5495}
5496
5497RecoveryExpr::RecoveryExpr(ASTContext &Ctx, QualType T, SourceLocation BeginLoc,
5498 SourceLocation EndLoc, ArrayRef<Expr *> SubExprs)
5499 : Expr(RecoveryExprClass, T.getNonReferenceType(),
5500 T->isDependentType() ? VK_LValue : getValueKindForType(T),
5501 OK_Ordinary),
5502 BeginLoc(BeginLoc), EndLoc(EndLoc), NumExprs(SubExprs.size()) {
5503 assert(!T.isNull());
5504 assert(!llvm::is_contained(SubExprs, nullptr));
5505
5506 llvm::copy(Range&: SubExprs, Out: getTrailingObjects());
5507 setDependence(computeDependence(E: this));
5508}
5509
5510RecoveryExpr *RecoveryExpr::Create(ASTContext &Ctx, QualType T,
5511 SourceLocation BeginLoc,
5512 SourceLocation EndLoc,
5513 ArrayRef<Expr *> SubExprs) {
5514 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: SubExprs.size()),
5515 Align: alignof(RecoveryExpr));
5516 return new (Mem) RecoveryExpr(Ctx, T, BeginLoc, EndLoc, SubExprs);
5517}
5518
5519RecoveryExpr *RecoveryExpr::CreateEmpty(ASTContext &Ctx, unsigned NumSubExprs) {
5520 void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: NumSubExprs),
5521 Align: alignof(RecoveryExpr));
5522 return new (Mem) RecoveryExpr(EmptyShell(), NumSubExprs);
5523}
5524
5525void OMPArrayShapingExpr::setDimensions(ArrayRef<Expr *> Dims) {
5526 assert(
5527 NumDims == Dims.size() &&
5528 "Preallocated number of dimensions is different from the provided one.");
5529 llvm::copy(Range&: Dims, Out: getTrailingObjects<Expr *>());
5530}
5531
5532void OMPArrayShapingExpr::setBracketsRanges(ArrayRef<SourceRange> BR) {
5533 assert(
5534 NumDims == BR.size() &&
5535 "Preallocated number of dimensions is different from the provided one.");
5536 llvm::copy(Range&: BR, Out: getTrailingObjects<SourceRange>());
5537}
5538
5539OMPArrayShapingExpr::OMPArrayShapingExpr(QualType ExprTy, Expr *Op,
5540 SourceLocation L, SourceLocation R,
5541 ArrayRef<Expr *> Dims)
5542 : Expr(OMPArrayShapingExprClass, ExprTy, VK_LValue, OK_Ordinary), LPLoc(L),
5543 RPLoc(R), NumDims(Dims.size()) {
5544 setBase(Op);
5545 setDimensions(Dims);
5546 setDependence(computeDependence(E: this));
5547}
5548
5549OMPArrayShapingExpr *
5550OMPArrayShapingExpr::Create(const ASTContext &Context, QualType T, Expr *Op,
5551 SourceLocation L, SourceLocation R,
5552 ArrayRef<Expr *> Dims,
5553 ArrayRef<SourceRange> BracketRanges) {
5554 assert(Dims.size() == BracketRanges.size() &&
5555 "Different number of dimensions and brackets ranges.");
5556 void *Mem = Context.Allocate(
5557 Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: Dims.size() + 1, Counts: Dims.size()),
5558 Align: alignof(OMPArrayShapingExpr));
5559 auto *E = new (Mem) OMPArrayShapingExpr(T, Op, L, R, Dims);
5560 E->setBracketsRanges(BracketRanges);
5561 return E;
5562}
5563
5564OMPArrayShapingExpr *OMPArrayShapingExpr::CreateEmpty(const ASTContext &Context,
5565 unsigned NumDims) {
5566 void *Mem = Context.Allocate(
5567 Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: NumDims + 1, Counts: NumDims),
5568 Align: alignof(OMPArrayShapingExpr));
5569 return new (Mem) OMPArrayShapingExpr(EmptyShell(), NumDims);
5570}
5571
5572void OMPIteratorExpr::setIteratorDeclaration(unsigned I, Decl *D) {
5573 getTrailingObjects<Decl *>(N: NumIterators)[I] = D;
5574}
5575
5576void OMPIteratorExpr::setAssignmentLoc(unsigned I, SourceLocation Loc) {
5577 assert(I < NumIterators &&
5578 "Idx is greater or equal the number of iterators definitions.");
5579 getTrailingObjects<
5580 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5581 static_cast<int>(RangeLocOffset::AssignLoc)] = Loc;
5582}
5583
5584void OMPIteratorExpr::setIteratorRange(unsigned I, Expr *Begin,
5585 SourceLocation ColonLoc, Expr *End,
5586 SourceLocation SecondColonLoc,
5587 Expr *Step) {
5588 assert(I < NumIterators &&
5589 "Idx is greater or equal the number of iterators definitions.");
5590 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5591 static_cast<int>(RangeExprOffset::Begin)] =
5592 Begin;
5593 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5594 static_cast<int>(RangeExprOffset::End)] = End;
5595 getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5596 static_cast<int>(RangeExprOffset::Step)] = Step;
5597 getTrailingObjects<
5598 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5599 static_cast<int>(RangeLocOffset::FirstColonLoc)] =
5600 ColonLoc;
5601 getTrailingObjects<
5602 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5603 static_cast<int>(RangeLocOffset::SecondColonLoc)] =
5604 SecondColonLoc;
5605}
5606
5607Decl *OMPIteratorExpr::getIteratorDecl(unsigned I) {
5608 return getTrailingObjects<Decl *>()[I];
5609}
5610
5611OMPIteratorExpr::IteratorRange OMPIteratorExpr::getIteratorRange(unsigned I) {
5612 IteratorRange Res;
5613 Res.Begin =
5614 getTrailingObjects<Expr *>()[I * static_cast<int>(
5615 RangeExprOffset::Total) +
5616 static_cast<int>(RangeExprOffset::Begin)];
5617 Res.End =
5618 getTrailingObjects<Expr *>()[I * static_cast<int>(
5619 RangeExprOffset::Total) +
5620 static_cast<int>(RangeExprOffset::End)];
5621 Res.Step =
5622 getTrailingObjects<Expr *>()[I * static_cast<int>(
5623 RangeExprOffset::Total) +
5624 static_cast<int>(RangeExprOffset::Step)];
5625 return Res;
5626}
5627
5628SourceLocation OMPIteratorExpr::getAssignLoc(unsigned I) const {
5629 return getTrailingObjects<
5630 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5631 static_cast<int>(RangeLocOffset::AssignLoc)];
5632}
5633
5634SourceLocation OMPIteratorExpr::getColonLoc(unsigned I) const {
5635 return getTrailingObjects<
5636 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5637 static_cast<int>(RangeLocOffset::FirstColonLoc)];
5638}
5639
5640SourceLocation OMPIteratorExpr::getSecondColonLoc(unsigned I) const {
5641 return getTrailingObjects<
5642 SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5643 static_cast<int>(RangeLocOffset::SecondColonLoc)];
5644}
5645
5646void OMPIteratorExpr::setHelper(unsigned I, const OMPIteratorHelperData &D) {
5647 getTrailingObjects<OMPIteratorHelperData>()[I] = D;
5648}
5649
5650OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) {
5651 return getTrailingObjects<OMPIteratorHelperData>()[I];
5652}
5653
5654const OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) const {
5655 return getTrailingObjects<OMPIteratorHelperData>()[I];
5656}
5657
5658OMPIteratorExpr::OMPIteratorExpr(
5659 QualType ExprTy, SourceLocation IteratorKwLoc, SourceLocation L,
5660 SourceLocation R, ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5661 ArrayRef<OMPIteratorHelperData> Helpers)
5662 : Expr(OMPIteratorExprClass, ExprTy, VK_LValue, OK_Ordinary),
5663 IteratorKwLoc(IteratorKwLoc), LPLoc(L), RPLoc(R),
5664 NumIterators(Data.size()) {
5665 for (unsigned I = 0, E = Data.size(); I < E; ++I) {
5666 const IteratorDefinition &D = Data[I];
5667 setIteratorDeclaration(I, D: D.IteratorDecl);
5668 setAssignmentLoc(I, Loc: D.AssignmentLoc);
5669 setIteratorRange(I, Begin: D.Range.Begin, ColonLoc: D.ColonLoc, End: D.Range.End,
5670 SecondColonLoc: D.SecondColonLoc, Step: D.Range.Step);
5671 setHelper(I, D: Helpers[I]);
5672 }
5673 setDependence(computeDependence(E: this));
5674}
5675
5676OMPIteratorExpr *
5677OMPIteratorExpr::Create(const ASTContext &Context, QualType T,
5678 SourceLocation IteratorKwLoc, SourceLocation L,
5679 SourceLocation R,
5680 ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5681 ArrayRef<OMPIteratorHelperData> Helpers) {
5682 assert(Data.size() == Helpers.size() &&
5683 "Data and helpers must have the same size.");
5684 void *Mem = Context.Allocate(
5685 Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5686 Counts: Data.size(), Counts: Data.size() * static_cast<int>(RangeExprOffset::Total),
5687 Counts: Data.size() * static_cast<int>(RangeLocOffset::Total),
5688 Counts: Helpers.size()),
5689 Align: alignof(OMPIteratorExpr));
5690 return new (Mem) OMPIteratorExpr(T, IteratorKwLoc, L, R, Data, Helpers);
5691}
5692
5693OMPIteratorExpr *OMPIteratorExpr::CreateEmpty(const ASTContext &Context,
5694 unsigned NumIterators) {
5695 void *Mem = Context.Allocate(
5696 Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5697 Counts: NumIterators, Counts: NumIterators * static_cast<int>(RangeExprOffset::Total),
5698 Counts: NumIterators * static_cast<int>(RangeLocOffset::Total), Counts: NumIterators),
5699 Align: alignof(OMPIteratorExpr));
5700 return new (Mem) OMPIteratorExpr(EmptyShell(), NumIterators);
5701}
5702
5703HLSLOutArgExpr *HLSLOutArgExpr::Create(const ASTContext &C, QualType Ty,
5704 OpaqueValueExpr *Base,
5705 OpaqueValueExpr *OpV, Expr *WB,
5706 bool IsInOut) {
5707 return new (C) HLSLOutArgExpr(Ty, Base, OpV, WB, IsInOut);
5708}
5709
5710HLSLOutArgExpr *HLSLOutArgExpr::CreateEmpty(const ASTContext &C) {
5711 return new (C) HLSLOutArgExpr(EmptyShell());
5712}
5713
5714OpenACCAsteriskSizeExpr *OpenACCAsteriskSizeExpr::Create(const ASTContext &C,
5715 SourceLocation Loc) {
5716 return new (C) OpenACCAsteriskSizeExpr(Loc, C.IntTy);
5717}
5718
5719OpenACCAsteriskSizeExpr *
5720OpenACCAsteriskSizeExpr::CreateEmpty(const ASTContext &C) {
5721 return new (C) OpenACCAsteriskSizeExpr({}, C.IntTy);
5722}
5723
5724ConvertVectorExpr *ConvertVectorExpr::CreateEmpty(const ASTContext &C,
5725 bool hasFPFeatures) {
5726 void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
5727 Align: alignof(ConvertVectorExpr));
5728 return new (Mem) ConvertVectorExpr(hasFPFeatures, EmptyShell());
5729}
5730
5731ConvertVectorExpr *ConvertVectorExpr::Create(
5732 const ASTContext &C, Expr *SrcExpr, TypeSourceInfo *TI, QualType DstType,
5733 ExprValueKind VK, ExprObjectKind OK, SourceLocation BuiltinLoc,
5734 SourceLocation RParenLoc, FPOptionsOverride FPFeatures) {
5735 bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5736 unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
5737 void *Mem = C.Allocate(Size, Align: alignof(ConvertVectorExpr));
5738 return new (Mem) ConvertVectorExpr(SrcExpr, TI, DstType, VK, OK, BuiltinLoc,
5739 RParenLoc, FPFeatures);
5740}
5741
5742APValue &CompoundLiteralExpr::getOrCreateStaticValue(ASTContext &Ctx) const {
5743 assert(hasStaticStorage());
5744 if (!StaticValue) {
5745 StaticValue = new (Ctx) APValue;
5746 Ctx.addDestruction(Ptr: StaticValue);
5747 }
5748 return *StaticValue;
5749}
5750
5751APValue &CompoundLiteralExpr::getStaticValue() const {
5752 assert(StaticValue);
5753 return *StaticValue;
5754}
5755
5756namespace {
5757/// Visitor that walks an Expr to the head of a struct-field access chain;
5758/// see clang::findStructFieldAccess.
5759class StructFieldAccessVisitor
5760 : public ConstStmtVisitor<StructFieldAccessVisitor, const Expr *> {
5761 bool AddrOfSeen = false;
5762
5763public:
5764 const Expr *ArrayIndex = nullptr;
5765 QualType ArrayElementTy;
5766
5767 const Expr *VisitMemberExpr(const MemberExpr *E) {
5768 if (AddrOfSeen && E->getType()->isArrayType())
5769 // '&fam' designates the array object as a whole, not the
5770 // pointer-to-element value that 'fam' decays to.
5771 return nullptr;
5772 return E;
5773 }
5774
5775 const Expr *VisitArraySubscriptExpr(const ArraySubscriptExpr *E) {
5776 if (ArrayIndex)
5777 // We don't support multiple subscripts.
5778 return nullptr;
5779
5780 AddrOfSeen = false; // '&ptr->array[idx]' is okay.
5781 ArrayIndex = E->getIdx();
5782 ArrayElementTy = E->getBase()->getType();
5783 return Visit(S: E->getBase());
5784 }
5785 const Expr *VisitCastExpr(const CastExpr *E) {
5786 if (E->getCastKind() == CK_LValueToRValue)
5787 return E;
5788 return Visit(S: E->getSubExpr());
5789 }
5790 const Expr *VisitParenExpr(const ParenExpr *E) {
5791 return Visit(S: E->getSubExpr());
5792 }
5793 const Expr *VisitUnaryAddrOf(const UnaryOperator *E) {
5794 AddrOfSeen = true;
5795 return Visit(S: E->getSubExpr());
5796 }
5797 const Expr *VisitUnaryDeref(const UnaryOperator *E) {
5798 AddrOfSeen = false;
5799 return Visit(S: E->getSubExpr());
5800 }
5801 const Expr *VisitBinaryOperator(const BinaryOperator *Op) {
5802 return Op->isCommaOp() ? Visit(S: Op->getRHS()) : nullptr;
5803 }
5804};
5805} // namespace
5806
5807const Expr *clang::findStructFieldAccess(const Expr *E,
5808 const Expr **OutArrayIndex,
5809 QualType *OutArrayElementTy) {
5810 StructFieldAccessVisitor V;
5811 const Expr *Result = V.Visit(S: E);
5812 if (OutArrayIndex)
5813 *OutArrayIndex = V.ArrayIndex;
5814 if (OutArrayElementTy)
5815 *OutArrayElementTy = V.ArrayElementTy;
5816 return Result;
5817}
5818