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/Basic/Builtins.h"
29	#include "clang/Basic/CharInfo.h"
30	#include "clang/Basic/SourceManager.h"
31	#include "clang/Basic/TargetInfo.h"
32	#include "clang/Lex/Lexer.h"
33	#include "clang/Lex/LiteralSupport.h"
34	#include "clang/Lex/Preprocessor.h"
35	#include "llvm/Support/ErrorHandling.h"
36	#include "llvm/Support/Format.h"
37	#include "llvm/Support/raw_ostream.h"
38	#include <algorithm>
39	#include <cstring>
40	#include <optional>
41	using namespace clang;
42
43	const Expr *Expr::getBestDynamicClassTypeExpr() const {
44	const Expr *E = this;
45	while (true) {
46	E = E->IgnoreParenBaseCasts();
47
48	// Follow the RHS of a comma operator.
49	if (auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
50	if (BO->getOpcode() == BO_Comma) {
51	E = BO->getRHS();
52	continue;
53	}
54	}
55
56	// Step into initializer for materialized temporaries.
57	if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Val: E)) {
58	E = MTE->getSubExpr();
59	continue;
60	}
61
62	break;
63	}
64
65	return E;
66	}
67
68	const CXXRecordDecl *Expr::getBestDynamicClassType() const {
69	const Expr *E = getBestDynamicClassTypeExpr();
70	QualType DerivedType = E->getType();
71	if (const PointerType *PTy = DerivedType->getAs<PointerType>())
72	DerivedType = PTy->getPointeeType();
73
74	if (DerivedType->isDependentType())
75	return nullptr;
76
77	const RecordType *Ty = DerivedType->castAs<RecordType>();
78	Decl *D = Ty->getDecl();
79	return cast<CXXRecordDecl>(Val: D);
80	}
81
82	const Expr *Expr::skipRValueSubobjectAdjustments(
83	SmallVectorImpl<const Expr *> &CommaLHSs,
84	SmallVectorImpl<SubobjectAdjustment> &Adjustments) const {
85	const Expr *E = this;
86	while (true) {
87	E = E->IgnoreParens();
88
89	if (const auto *CE = dyn_cast<CastExpr>(Val: E)) {
90	if ((CE->getCastKind() == CK_DerivedToBase ||
91	CE->getCastKind() == CK_UncheckedDerivedToBase) &&
92	E->getType()->isRecordType()) {
93	E = CE->getSubExpr();
94	const auto *Derived =
95	cast<CXXRecordDecl>(Val: E->getType()->castAs<RecordType>()->getDecl());
96	Adjustments.push_back(Elt: SubobjectAdjustment(CE, Derived));
97	continue;
98	}
99
100	if (CE->getCastKind() == CK_NoOp) {
101	E = CE->getSubExpr();
102	continue;
103	}
104	} else if (const auto *ME = dyn_cast<MemberExpr>(Val: E)) {
105	if (!ME->isArrow()) {
106	assert(ME->getBase()->getType()->getAsRecordDecl());
107	if (const auto *Field = dyn_cast<FieldDecl>(Val: ME->getMemberDecl())) {
108	if (!Field->isBitField() && !Field->getType()->isReferenceType()) {
109	E = ME->getBase();
110	Adjustments.push_back(Elt: SubobjectAdjustment(Field));
111	continue;
112	}
113	}
114	}
115	} else if (const auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
116	if (BO->getOpcode() == BO_PtrMemD) {
117	assert(BO->getRHS()->isPRValue());
118	E = BO->getLHS();
119	const auto *MPT = BO->getRHS()->getType()->getAs<MemberPointerType>();
120	Adjustments.push_back(Elt: SubobjectAdjustment(MPT, BO->getRHS()));
121	continue;
122	}
123	if (BO->getOpcode() == BO_Comma) {
124	CommaLHSs.push_back(Elt: BO->getLHS());
125	E = BO->getRHS();
126	continue;
127	}
128	}
129
130	// Nothing changed.
131	break;
132	}
133	return E;
134	}
135
136	bool Expr::isKnownToHaveBooleanValue(bool Semantic) const {
137	const Expr *E = IgnoreParens();
138
139	// If this value has _Bool type, it is obvious 0/1.
140	if (E->getType()->isBooleanType()) return true;
141	// If this is a non-scalar-integer type, we don't care enough to try.
142	if (!E->getType()->isIntegralOrEnumerationType()) return false;
143
144	if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(Val: E)) {
145	switch (UO->getOpcode()) {
146	case UO_Plus:
147	return UO->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
148	case UO_LNot:
149	return true;
150	default:
151	return false;
152	}
153	}
154
155	// Only look through implicit casts. If the user writes
156	// '(int) (a && b)' treat it as an arbitrary int.
157	// FIXME: Should we look through any cast expression in !Semantic mode?
158	if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(Val: E))
159	return CE->getSubExpr()->isKnownToHaveBooleanValue(Semantic);
160
161	if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: E)) {
162	switch (BO->getOpcode()) {
163	default: return false;
164	case BO_LT: // Relational operators.
165	case BO_GT:
166	case BO_LE:
167	case BO_GE:
168	case BO_EQ: // Equality operators.
169	case BO_NE:
170	case BO_LAnd: // AND operator.
171	case BO_LOr: // Logical OR operator.
172	return true;
173
174	case BO_And: // Bitwise AND operator.
175	case BO_Xor: // Bitwise XOR operator.
176	case BO_Or: // Bitwise OR operator.
177	// Handle things like (x==2)|(y==12).
178	return BO->getLHS()->isKnownToHaveBooleanValue(Semantic) &&
179	BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
180
181	case BO_Comma:
182	case BO_Assign:
183	return BO->getRHS()->isKnownToHaveBooleanValue(Semantic);
184	}
185	}
186
187	if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(Val: E))
188	return CO->getTrueExpr()->isKnownToHaveBooleanValue(Semantic) &&
189	CO->getFalseExpr()->isKnownToHaveBooleanValue(Semantic);
190
191	if (isa<ObjCBoolLiteralExpr>(Val: E))
192	return true;
193
194	if (const auto *OVE = dyn_cast<OpaqueValueExpr>(Val: E))
195	return OVE->getSourceExpr()->isKnownToHaveBooleanValue(Semantic);
196
197	if (const FieldDecl *FD = E->getSourceBitField())
198	if (!Semantic && FD->getType()->isUnsignedIntegerType() &&
199	!FD->getBitWidth()->isValueDependent() && FD->getBitWidthValue() == 1)
200	return true;
201
202	return false;
203	}
204
205	bool Expr::isFlexibleArrayMemberLike(
206	const ASTContext &Ctx,
207	LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
208	bool IgnoreTemplateOrMacroSubstitution) const {
209	const Expr *E = IgnoreParens();
210	const Decl *D = nullptr;
211
212	if (const auto *ME = dyn_cast<MemberExpr>(Val: E))
213	D = ME->getMemberDecl();
214	else if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
215	D = DRE->getDecl();
216	else if (const auto *IRE = dyn_cast<ObjCIvarRefExpr>(Val: E))
217	D = IRE->getDecl();
218
219	return Decl::isFlexibleArrayMemberLike(Context: Ctx, D, Ty: E->getType(),
220	StrictFlexArraysLevel,
221	IgnoreTemplateOrMacroSubstitution);
222	}
223
224	const ValueDecl *
225	Expr::getAsBuiltinConstantDeclRef(const ASTContext &Context) const {
226	Expr::EvalResult Eval;
227
228	if (EvaluateAsConstantExpr(Result&: Eval, Ctx: Context)) {
229	APValue &Value = Eval.Val;
230
231	if (Value.isMemberPointer())
232	return Value.getMemberPointerDecl();
233
234	if (Value.isLValue() && Value.getLValueOffset().isZero())
235	return Value.getLValueBase().dyn_cast<const ValueDecl *>();
236	}
237
238	return nullptr;
239	}
240
241	// Amusing macro metaprogramming hack: check whether a class provides
242	// a more specific implementation of getExprLoc().
243	//
244	// See also Stmt.cpp:{getBeginLoc(),getEndLoc()}.
245	namespace {
246	/// This implementation is used when a class provides a custom
247	/// implementation of getExprLoc.
248	template <class E, class T>
249	SourceLocation getExprLocImpl(const Expr *expr,
250	SourceLocation (T::*v)() const) {
251	return static_cast<const E*>(expr)->getExprLoc();
252	}
253
254	/// This implementation is used when a class doesn't provide
255	/// a custom implementation of getExprLoc. Overload resolution
256	/// should pick it over the implementation above because it's
257	/// more specialized according to function template partial ordering.
258	template <class E>
259	SourceLocation getExprLocImpl(const Expr *expr,
260	SourceLocation (Expr::*v)() const) {
261	return static_cast<const E *>(expr)->getBeginLoc();
262	}
263	}
264
265	QualType Expr::getEnumCoercedType(const ASTContext &Ctx) const {
266	if (isa<EnumType>(Val: getType()))
267	return getType();
268	if (const auto *ECD = getEnumConstantDecl()) {
269	const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
270	if (ED->isCompleteDefinition())
271	return Ctx.getTypeDeclType(Decl: ED);
272	}
273	return getType();
274	}
275
276	SourceLocation Expr::getExprLoc() const {
277	switch (getStmtClass()) {
278	case Stmt::NoStmtClass: llvm_unreachable("statement without class");
279	#define ABSTRACT_STMT(type)
280	#define STMT(type, base) \
281	case Stmt::type##Class: break;
282	#define EXPR(type, base) \
283	case Stmt::type##Class: return getExprLocImpl<type>(this, &type::getExprLoc);
284	#include "clang/AST/StmtNodes.inc"
285	}
286	llvm_unreachable("unknown expression kind");
287	}
288
289	//===----------------------------------------------------------------------===//
290	// Primary Expressions.
291	//===----------------------------------------------------------------------===//
292
293	static void AssertResultStorageKind(ConstantResultStorageKind Kind) {
294	assert((Kind == ConstantResultStorageKind::APValue ||
295	Kind == ConstantResultStorageKind::Int64 ||
296	Kind == ConstantResultStorageKind::None) &&
297	"Invalid StorageKind Value");
298	(void)Kind;
299	}
300
301	ConstantResultStorageKind ConstantExpr::getStorageKind(const APValue &Value) {
302	switch (Value.getKind()) {
303	case APValue::None:
304	case APValue::Indeterminate:
305	return ConstantResultStorageKind::None;
306	case APValue::Int:
307	if (!Value.getInt().needsCleanup())
308	return ConstantResultStorageKind::Int64;
309	[[fallthrough]];
310	default:
311	return ConstantResultStorageKind::APValue;
312	}
313	}
314
315	ConstantResultStorageKind
316	ConstantExpr::getStorageKind(const Type *T, const ASTContext &Context) {
317	if (T->isIntegralOrEnumerationType() && Context.getTypeInfo(T).Width <= 64)
318	return ConstantResultStorageKind::Int64;
319	return ConstantResultStorageKind::APValue;
320	}
321
322	ConstantExpr::ConstantExpr(Expr *SubExpr, ConstantResultStorageKind StorageKind,
323	bool IsImmediateInvocation)
324	: FullExpr(ConstantExprClass, SubExpr) {
325	ConstantExprBits.ResultKind = llvm::to_underlying(E: StorageKind);
326	ConstantExprBits.APValueKind = APValue::None;
327	ConstantExprBits.IsUnsigned = false;
328	ConstantExprBits.BitWidth = 0;
329	ConstantExprBits.HasCleanup = false;
330	ConstantExprBits.IsImmediateInvocation = IsImmediateInvocation;
331
332	if (StorageKind == ConstantResultStorageKind::APValue)
333	::new (getTrailingObjects<APValue>()) APValue();
334	}
335
336	ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
337	ConstantResultStorageKind StorageKind,
338	bool IsImmediateInvocation) {
339	assert(!isa<ConstantExpr>(E));
340	AssertResultStorageKind(Kind: StorageKind);
341
342	unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
343	Counts: StorageKind == ConstantResultStorageKind::APValue,
344	Counts: StorageKind == ConstantResultStorageKind::Int64);
345	void *Mem = Context.Allocate(Size, Align: alignof(ConstantExpr));
346	return new (Mem) ConstantExpr(E, StorageKind, IsImmediateInvocation);
347	}
348
349	ConstantExpr *ConstantExpr::Create(const ASTContext &Context, Expr *E,
350	const APValue &Result) {
351	ConstantResultStorageKind StorageKind = getStorageKind(Value: Result);
352	ConstantExpr *Self = Create(Context, E, StorageKind);
353	Self->SetResult(Value: Result, Context);
354	return Self;
355	}
356
357	ConstantExpr::ConstantExpr(EmptyShell Empty,
358	ConstantResultStorageKind StorageKind)
359	: FullExpr(ConstantExprClass, Empty) {
360	ConstantExprBits.ResultKind = llvm::to_underlying(E: StorageKind);
361
362	if (StorageKind == ConstantResultStorageKind::APValue)
363	::new (getTrailingObjects<APValue>()) APValue();
364	}
365
366	ConstantExpr *ConstantExpr::CreateEmpty(const ASTContext &Context,
367	ConstantResultStorageKind StorageKind) {
368	AssertResultStorageKind(Kind: StorageKind);
369
370	unsigned Size = totalSizeToAlloc<APValue, uint64_t>(
371	Counts: StorageKind == ConstantResultStorageKind::APValue,
372	Counts: StorageKind == ConstantResultStorageKind::Int64);
373	void *Mem = Context.Allocate(Size, Align: alignof(ConstantExpr));
374	return new (Mem) ConstantExpr(EmptyShell(), StorageKind);
375	}
376
377	void ConstantExpr::MoveIntoResult(APValue &Value, const ASTContext &Context) {
378	assert((unsigned)getStorageKind(Value) <= ConstantExprBits.ResultKind &&
379	"Invalid storage for this value kind");
380	ConstantExprBits.APValueKind = Value.getKind();
381	switch (getResultStorageKind()) {
382	case ConstantResultStorageKind::None:
383	return;
384	case ConstantResultStorageKind::Int64:
385	Int64Result() = *Value.getInt().getRawData();
386	ConstantExprBits.BitWidth = Value.getInt().getBitWidth();
387	ConstantExprBits.IsUnsigned = Value.getInt().isUnsigned();
388	return;
389	case ConstantResultStorageKind::APValue:
390	if (!ConstantExprBits.HasCleanup && Value.needsCleanup()) {
391	ConstantExprBits.HasCleanup = true;
392	Context.addDestruction(Ptr: &APValueResult());
393	}
394	APValueResult() = std::move(Value);
395	return;
396	}
397	llvm_unreachable("Invalid ResultKind Bits");
398	}
399
400	llvm::APSInt ConstantExpr::getResultAsAPSInt() const {
401	switch (getResultStorageKind()) {
402	case ConstantResultStorageKind::APValue:
403	return APValueResult().getInt();
404	case ConstantResultStorageKind::Int64:
405	return llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
406	ConstantExprBits.IsUnsigned);
407	default:
408	llvm_unreachable("invalid Accessor");
409	}
410	}
411
412	APValue ConstantExpr::getAPValueResult() const {
413
414	switch (getResultStorageKind()) {
415	case ConstantResultStorageKind::APValue:
416	return APValueResult();
417	case ConstantResultStorageKind::Int64:
418	return APValue(
419	llvm::APSInt(llvm::APInt(ConstantExprBits.BitWidth, Int64Result()),
420	ConstantExprBits.IsUnsigned));
421	case ConstantResultStorageKind::None:
422	if (ConstantExprBits.APValueKind == APValue::Indeterminate)
423	return APValue::IndeterminateValue();
424	return APValue();
425	}
426	llvm_unreachable("invalid ResultKind");
427	}
428
429	DeclRefExpr::DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
430	bool RefersToEnclosingVariableOrCapture, QualType T,
431	ExprValueKind VK, SourceLocation L,
432	const DeclarationNameLoc &LocInfo,
433	NonOdrUseReason NOUR)
434	: Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D), DNLoc(LocInfo) {
435	DeclRefExprBits.HasQualifier = false;
436	DeclRefExprBits.HasTemplateKWAndArgsInfo = false;
437	DeclRefExprBits.HasFoundDecl = false;
438	DeclRefExprBits.HadMultipleCandidates = false;
439	DeclRefExprBits.RefersToEnclosingVariableOrCapture =
440	RefersToEnclosingVariableOrCapture;
441	DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
442	DeclRefExprBits.NonOdrUseReason = NOUR;
443	DeclRefExprBits.IsImmediateEscalating = false;
444	DeclRefExprBits.Loc = L;
445	setDependence(computeDependence(E: this, Ctx));
446	}
447
448	DeclRefExpr::DeclRefExpr(const ASTContext &Ctx,
449	NestedNameSpecifierLoc QualifierLoc,
450	SourceLocation TemplateKWLoc, ValueDecl *D,
451	bool RefersToEnclosingVariableOrCapture,
452	const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
453	const TemplateArgumentListInfo *TemplateArgs,
454	QualType T, ExprValueKind VK, NonOdrUseReason NOUR)
455	: Expr(DeclRefExprClass, T, VK, OK_Ordinary), D(D),
456	DNLoc(NameInfo.getInfo()) {
457	DeclRefExprBits.Loc = NameInfo.getLoc();
458	DeclRefExprBits.HasQualifier = QualifierLoc ? 1 : 0;
459	if (QualifierLoc)
460	new (getTrailingObjects<NestedNameSpecifierLoc>())
461	NestedNameSpecifierLoc(QualifierLoc);
462	DeclRefExprBits.HasFoundDecl = FoundD ? 1 : 0;
463	if (FoundD)
464	*getTrailingObjects<NamedDecl *>() = FoundD;
465	DeclRefExprBits.HasTemplateKWAndArgsInfo
466	= (TemplateArgs || TemplateKWLoc.isValid()) ? 1 : 0;
467	DeclRefExprBits.RefersToEnclosingVariableOrCapture =
468	RefersToEnclosingVariableOrCapture;
469	DeclRefExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
470	DeclRefExprBits.NonOdrUseReason = NOUR;
471	if (TemplateArgs) {
472	auto Deps = TemplateArgumentDependence::None;
473	getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
474	TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
475	Deps);
476	assert(!(Deps & TemplateArgumentDependence::Dependent) &&
477	"built a DeclRefExpr with dependent template args");
478	} else if (TemplateKWLoc.isValid()) {
479	getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
480	TemplateKWLoc);
481	}
482	DeclRefExprBits.IsImmediateEscalating = false;
483	DeclRefExprBits.HadMultipleCandidates = 0;
484	setDependence(computeDependence(E: this, Ctx));
485	}
486
487	DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
488	NestedNameSpecifierLoc QualifierLoc,
489	SourceLocation TemplateKWLoc, ValueDecl *D,
490	bool RefersToEnclosingVariableOrCapture,
491	SourceLocation NameLoc, QualType T,
492	ExprValueKind VK, NamedDecl *FoundD,
493	const TemplateArgumentListInfo *TemplateArgs,
494	NonOdrUseReason NOUR) {
495	return Create(Context, QualifierLoc, TemplateKWLoc, D,
496	RefersToEnclosingVariableOrCapture,
497	NameInfo: DeclarationNameInfo(D->getDeclName(), NameLoc),
498	T, VK, FoundD, TemplateArgs, NOUR);
499	}
500
501	DeclRefExpr *DeclRefExpr::Create(const ASTContext &Context,
502	NestedNameSpecifierLoc QualifierLoc,
503	SourceLocation TemplateKWLoc, ValueDecl *D,
504	bool RefersToEnclosingVariableOrCapture,
505	const DeclarationNameInfo &NameInfo,
506	QualType T, ExprValueKind VK,
507	NamedDecl *FoundD,
508	const TemplateArgumentListInfo *TemplateArgs,
509	NonOdrUseReason NOUR) {
510	// Filter out cases where the found Decl is the same as the value refenenced.
511	if (D == FoundD)
512	FoundD = nullptr;
513
514	bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
515	std::size_t Size =
516	totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
517	ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
518	Counts: QualifierLoc ? 1 : 0, Counts: FoundD ? 1 : 0,
519	Counts: HasTemplateKWAndArgsInfo ? 1 : 0,
520	Counts: TemplateArgs ? TemplateArgs->size() : 0);
521
522	void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
523	return new (Mem) DeclRefExpr(Context, QualifierLoc, TemplateKWLoc, D,
524	RefersToEnclosingVariableOrCapture, NameInfo,
525	FoundD, TemplateArgs, T, VK, NOUR);
526	}
527
528	DeclRefExpr *DeclRefExpr::CreateEmpty(const ASTContext &Context,
529	bool HasQualifier,
530	bool HasFoundDecl,
531	bool HasTemplateKWAndArgsInfo,
532	unsigned NumTemplateArgs) {
533	assert(NumTemplateArgs == 0 || HasTemplateKWAndArgsInfo);
534	std::size_t Size =
535	totalSizeToAlloc<NestedNameSpecifierLoc, NamedDecl *,
536	ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
537	Counts: HasQualifier ? 1 : 0, Counts: HasFoundDecl ? 1 : 0, Counts: HasTemplateKWAndArgsInfo,
538	Counts: NumTemplateArgs);
539	void *Mem = Context.Allocate(Size, Align: alignof(DeclRefExpr));
540	return new (Mem) DeclRefExpr(EmptyShell());
541	}
542
543	void DeclRefExpr::setDecl(ValueDecl *NewD) {
544	D = NewD;
545	if (getType()->isUndeducedType())
546	setType(NewD->getType());
547	setDependence(computeDependence(this, NewD->getASTContext()));
548	}
549
550	SourceLocation DeclRefExpr::getEndLoc() const {
551	if (hasExplicitTemplateArgs())
552	return getRAngleLoc();
553	return getNameInfo().getEndLoc();
554	}
555
556	SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(SourceLocation OpLoc,
557	SourceLocation LParen,
558	SourceLocation RParen,
559	QualType ResultTy,
560	TypeSourceInfo *TSI)
561	: Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary),
562	OpLoc(OpLoc), LParen(LParen), RParen(RParen) {
563	setTypeSourceInfo(TSI);
564	setDependence(computeDependence(E: this));
565	}
566
567	SYCLUniqueStableNameExpr::SYCLUniqueStableNameExpr(EmptyShell Empty,
568	QualType ResultTy)
569	: Expr(SYCLUniqueStableNameExprClass, ResultTy, VK_PRValue, OK_Ordinary) {}
570
571	SYCLUniqueStableNameExpr *
572	SYCLUniqueStableNameExpr::Create(const ASTContext &Ctx, SourceLocation OpLoc,
573	SourceLocation LParen, SourceLocation RParen,
574	TypeSourceInfo *TSI) {
575	QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
576	return new (Ctx)
577	SYCLUniqueStableNameExpr(OpLoc, LParen, RParen, ResultTy, TSI);
578	}
579
580	SYCLUniqueStableNameExpr *
581	SYCLUniqueStableNameExpr::CreateEmpty(const ASTContext &Ctx) {
582	QualType ResultTy = Ctx.getPointerType(Ctx.CharTy.withConst());
583	return new (Ctx) SYCLUniqueStableNameExpr(EmptyShell(), ResultTy);
584	}
585
586	std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context) const {
587	return SYCLUniqueStableNameExpr::ComputeName(Context,
588	Ty: getTypeSourceInfo()->getType());
589	}
590
591	std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
592	QualType Ty) {
593	auto MangleCallback = [](ASTContext &Ctx,
594	const NamedDecl *ND) -> UnsignedOrNone {
595	if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: ND))
596	return RD->getDeviceLambdaManglingNumber();
597	return std::nullopt;
598	};
599
600	std::unique_ptr<MangleContext> Ctx{ItaniumMangleContext::create(
601	Context, Diags&: Context.getDiagnostics(), Discriminator: MangleCallback)};
602
603	std::string Buffer;
604	Buffer.reserve(res: 128);
605	llvm::raw_string_ostream Out(Buffer);
606	Ctx->mangleCanonicalTypeName(T: Ty, Out);
607
608	return Buffer;
609	}
610
611	PredefinedExpr::PredefinedExpr(SourceLocation L, QualType FNTy,
612	PredefinedIdentKind IK, bool IsTransparent,
613	StringLiteral *SL)
614	: Expr(PredefinedExprClass, FNTy, VK_LValue, OK_Ordinary) {
615	PredefinedExprBits.Kind = llvm::to_underlying(E: IK);
616	assert((getIdentKind() == IK) &&
617	"IdentKind do not fit in PredefinedExprBitfields!");
618	bool HasFunctionName = SL != nullptr;
619	PredefinedExprBits.HasFunctionName = HasFunctionName;
620	PredefinedExprBits.IsTransparent = IsTransparent;
621	PredefinedExprBits.Loc = L;
622	if (HasFunctionName)
623	setFunctionName(SL);
624	setDependence(computeDependence(E: this));
625	}
626
627	PredefinedExpr::PredefinedExpr(EmptyShell Empty, bool HasFunctionName)
628	: Expr(PredefinedExprClass, Empty) {
629	PredefinedExprBits.HasFunctionName = HasFunctionName;
630	}
631
632	PredefinedExpr *PredefinedExpr::Create(const ASTContext &Ctx, SourceLocation L,
633	QualType FNTy, PredefinedIdentKind IK,
634	bool IsTransparent, StringLiteral *SL) {
635	bool HasFunctionName = SL != nullptr;
636	void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
637	Align: alignof(PredefinedExpr));
638	return new (Mem) PredefinedExpr(L, FNTy, IK, IsTransparent, SL);
639	}
640
641	PredefinedExpr *PredefinedExpr::CreateEmpty(const ASTContext &Ctx,
642	bool HasFunctionName) {
643	void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: HasFunctionName),
644	Align: alignof(PredefinedExpr));
645	return new (Mem) PredefinedExpr(EmptyShell(), HasFunctionName);
646	}
647
648	StringRef PredefinedExpr::getIdentKindName(PredefinedIdentKind IK) {
649	switch (IK) {
650	case PredefinedIdentKind::Func:
651	return "__func__";
652	case PredefinedIdentKind::Function:
653	return "__FUNCTION__";
654	case PredefinedIdentKind::FuncDName:
655	return "__FUNCDNAME__";
656	case PredefinedIdentKind::LFunction:
657	return "L__FUNCTION__";
658	case PredefinedIdentKind::PrettyFunction:
659	return "__PRETTY_FUNCTION__";
660	case PredefinedIdentKind::FuncSig:
661	return "__FUNCSIG__";
662	case PredefinedIdentKind::LFuncSig:
663	return "L__FUNCSIG__";
664	case PredefinedIdentKind::PrettyFunctionNoVirtual:
665	break;
666	}
667	llvm_unreachable("Unknown ident kind for PredefinedExpr");
668	}
669
670	// FIXME: Maybe this should use DeclPrinter with a special "print predefined
671	// expr" policy instead.
672	std::string PredefinedExpr::ComputeName(PredefinedIdentKind IK,
673	const Decl *CurrentDecl,
674	bool ForceElaboratedPrinting) {
675	ASTContext &Context = CurrentDecl->getASTContext();
676
677	if (IK == PredefinedIdentKind::FuncDName) {
678	if (const NamedDecl *ND = dyn_cast<NamedDecl>(Val: CurrentDecl)) {
679	std::unique_ptr<MangleContext> MC;
680	MC.reset(p: Context.createMangleContext());
681
682	if (MC->shouldMangleDeclName(D: ND)) {
683	SmallString<256> Buffer;
684	llvm::raw_svector_ostream Out(Buffer);
685	GlobalDecl GD;
686	if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(Val: ND))
687	GD = GlobalDecl(CD, Ctor_Base);
688	else if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(Val: ND))
689	GD = GlobalDecl(DD, Dtor_Base);
690	else if (auto FD = dyn_cast<FunctionDecl>(Val: ND)) {
691	GD = FD->isReferenceableKernel() ? GlobalDecl(FD) : GlobalDecl(ND);
692	} else
693	GD = GlobalDecl(ND);
694	MC->mangleName(GD, Out);
695
696	if (!Buffer.empty() && Buffer.front() == '\01')
697	return std::string(Buffer.substr(Start: 1));
698	return std::string(Buffer);
699	}
700	return std::string(ND->getIdentifier()->getName());
701	}
702	return "";
703	}
704	if (isa<BlockDecl>(Val: CurrentDecl)) {
705	// For blocks we only emit something if it is enclosed in a function
706	// For top-level block we'd like to include the name of variable, but we
707	// don't have it at this point.
708	auto DC = CurrentDecl->getDeclContext();
709	if (DC->isFileContext())
710	return "";
711
712	SmallString<256> Buffer;
713	llvm::raw_svector_ostream Out(Buffer);
714	if (auto *DCBlock = dyn_cast<BlockDecl>(Val: DC))
715	// For nested blocks, propagate up to the parent.
716	Out << ComputeName(IK, DCBlock);
717	else if (auto *DCDecl = dyn_cast<Decl>(Val: DC))
718	Out << ComputeName(IK, CurrentDecl: DCDecl) << "_block_invoke";
719	return std::string(Out.str());
720	}
721	if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: CurrentDecl)) {
722	const auto &LO = Context.getLangOpts();
723	bool IsFuncOrFunctionInNonMSVCCompatEnv =
724	((IK == PredefinedIdentKind::Func ||
725	IK == PredefinedIdentKind ::Function) &&
726	!LO.MSVCCompat);
727	bool IsLFunctionInMSVCCommpatEnv =
728	IK == PredefinedIdentKind::LFunction && LO.MSVCCompat;
729	bool IsFuncOrFunctionOrLFunctionOrFuncDName =
730	IK != PredefinedIdentKind::PrettyFunction &&
731	IK != PredefinedIdentKind::PrettyFunctionNoVirtual &&
732	IK != PredefinedIdentKind::FuncSig &&
733	IK != PredefinedIdentKind::LFuncSig;
734	if ((ForceElaboratedPrinting &&
735	(IsFuncOrFunctionInNonMSVCCompatEnv || IsLFunctionInMSVCCommpatEnv)) ||
736	(!ForceElaboratedPrinting && IsFuncOrFunctionOrLFunctionOrFuncDName))
737	return FD->getNameAsString();
738
739	SmallString<256> Name;
740	llvm::raw_svector_ostream Out(Name);
741
742	if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
743	if (MD->isVirtual() && IK != PredefinedIdentKind::PrettyFunctionNoVirtual)
744	Out << "virtual ";
745	if (MD->isStatic() && !ForceElaboratedPrinting)
746	Out << "static ";
747	}
748
749	class PrettyCallbacks final : public PrintingCallbacks {
750	public:
751	PrettyCallbacks(const LangOptions &LO) : LO(LO) {}
752	std::string remapPath(StringRef Path) const override {
753	SmallString<128> p(Path);
754	LO.remapPathPrefix(Path&: p);
755	return std::string(p);
756	}
757
758	private:
759	const LangOptions &LO;
760	};
761	PrintingPolicy Policy(Context.getLangOpts());
762	PrettyCallbacks PrettyCB(Context.getLangOpts());
763	Policy.Callbacks = &PrettyCB;
764	if (IK == PredefinedIdentKind::Function && ForceElaboratedPrinting)
765	Policy.SuppressTagKeyword = !LO.MSVCCompat;
766	std::string Proto;
767	llvm::raw_string_ostream POut(Proto);
768
769	const FunctionDecl *Decl = FD;
770	if (const FunctionDecl* Pattern = FD->getTemplateInstantiationPattern())
771	Decl = Pattern;
772
773	// Bail out if the type of the function has not been set yet.
774	// This can notably happen in the trailing return type of a lambda
775	// expression.
776	const Type *Ty = Decl->getType().getTypePtrOrNull();
777	if (!Ty)
778	return "";
779
780	const FunctionType *AFT = Ty->getAs<FunctionType>();
781	const FunctionProtoType *FT = nullptr;
782	if (FD->hasWrittenPrototype())
783	FT = dyn_cast<FunctionProtoType>(Val: AFT);
784
785	if (IK == PredefinedIdentKind::FuncSig ||
786	IK == PredefinedIdentKind::LFuncSig) {
787	switch (AFT->getCallConv()) {
788	case CC_C: POut << "__cdecl "; break;
789	case CC_X86StdCall: POut << "__stdcall "; break;
790	case CC_X86FastCall: POut << "__fastcall "; break;
791	case CC_X86ThisCall: POut << "__thiscall "; break;
792	case CC_X86VectorCall: POut << "__vectorcall "; break;
793	case CC_X86RegCall: POut << "__regcall "; break;
794	// Only bother printing the conventions that MSVC knows about.
795	default: break;
796	}
797	}
798
799	FD->printQualifiedName(POut, Policy);
800
801	if (IK == PredefinedIdentKind::Function) {
802	Out << Proto;
803	return std::string(Name);
804	}
805
806	POut << "(";
807	if (FT) {
808	for (unsigned i = 0, e = Decl->getNumParams(); i != e; ++i) {
809	if (i) POut << ", ";
810	POut << Decl->getParamDecl(i)->getType().stream(Policy);
811	}
812
813	if (FT->isVariadic()) {
814	if (FD->getNumParams()) POut << ", ";
815	POut << "...";
816	} else if ((IK == PredefinedIdentKind::FuncSig ||
817	IK == PredefinedIdentKind::LFuncSig ||
818	!Context.getLangOpts().CPlusPlus) &&
819	!Decl->getNumParams()) {
820	POut << "void";
821	}
822	}
823	POut << ")";
824
825	if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Val: FD)) {
826	assert(FT && "We must have a written prototype in this case.");
827	if (FT->isConst())
828	POut << " const";
829	if (FT->isVolatile())
830	POut << " volatile";
831	RefQualifierKind Ref = MD->getRefQualifier();
832	if (Ref == RQ_LValue)
833	POut << " &";
834	else if (Ref == RQ_RValue)
835	POut << " &&";
836	}
837
838	typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
839	SpecsTy Specs;
840	const DeclContext *Ctx = FD->getDeclContext();
841	while (isa_and_nonnull<NamedDecl>(Val: Ctx)) {
842	const ClassTemplateSpecializationDecl *Spec
843	= dyn_cast<ClassTemplateSpecializationDecl>(Val: Ctx);
844	if (Spec && !Spec->isExplicitSpecialization())
845	Specs.push_back(Elt: Spec);
846	Ctx = Ctx->getParent();
847	}
848
849	std::string TemplateParams;
850	llvm::raw_string_ostream TOut(TemplateParams);
851	for (const ClassTemplateSpecializationDecl *D : llvm::reverse(C&: Specs)) {
852	const TemplateParameterList *Params =
853	D->getSpecializedTemplate()->getTemplateParameters();
854	const TemplateArgumentList &Args = D->getTemplateArgs();
855	assert(Params->size() == Args.size());
856	for (unsigned i = 0, numParams = Params->size(); i != numParams; ++i) {
857	StringRef Param = Params->getParam(Idx: i)->getName();
858	if (Param.empty()) continue;
859	TOut << Param << " = ";
860	Args.get(Idx: i).print(Policy, Out&: TOut,
861	IncludeType: TemplateParameterList::shouldIncludeTypeForArgument(
862	Policy, TPL: Params, Idx: i));
863	TOut << ", ";
864	}
865	}
866
867	FunctionTemplateSpecializationInfo *FSI
868	= FD->getTemplateSpecializationInfo();
869	if (FSI && !FSI->isExplicitSpecialization()) {
870	const TemplateParameterList* Params
871	= FSI->getTemplate()->getTemplateParameters();
872	const TemplateArgumentList* Args = FSI->TemplateArguments;
873	assert(Params->size() == Args->size());
874	for (unsigned i = 0, e = Params->size(); i != e; ++i) {
875	StringRef Param = Params->getParam(Idx: i)->getName();
876	if (Param.empty()) continue;
877	TOut << Param << " = ";
878	Args->get(Idx: i).print(Policy, Out&: TOut, /*IncludeType*/ true);
879	TOut << ", ";
880	}
881	}
882
883	if (!TemplateParams.empty()) {
884	// remove the trailing comma and space
885	TemplateParams.resize(n: TemplateParams.size() - 2);
886	POut << " [" << TemplateParams << "]";
887	}
888
889	// Print "auto" for all deduced return types. This includes C++1y return
890	// type deduction and lambdas. For trailing return types resolve the
891	// decltype expression. Otherwise print the real type when this is
892	// not a constructor or destructor.
893	if (isLambdaMethod(FD))
894	Proto = "auto " + Proto;
895	else if (FT && FT->getReturnType()->getAs<DecltypeType>())
896	FT->getReturnType()
897	->getAs<DecltypeType>()
898	->getUnderlyingType()
899	.getAsStringInternal(Proto, Policy);
900	else if (!isa<CXXConstructorDecl>(Val: FD) && !isa<CXXDestructorDecl>(Val: FD))
901	AFT->getReturnType().getAsStringInternal(Str&: Proto, Policy);
902
903	Out << Proto;
904
905	return std::string(Name);
906	}
907	if (const CapturedDecl *CD = dyn_cast<CapturedDecl>(Val: CurrentDecl)) {
908	for (const DeclContext *DC = CD->getParent(); DC; DC = DC->getParent())
909	// Skip to its enclosing function or method, but not its enclosing
910	// CapturedDecl.
911	if (DC->isFunctionOrMethod() && (DC->getDeclKind() != Decl::Captured)) {
912	const Decl *D = Decl::castFromDeclContext(DC);
913	return ComputeName(IK, CurrentDecl: D);
914	}
915	llvm_unreachable("CapturedDecl not inside a function or method");
916	}
917	if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Val: CurrentDecl)) {
918	SmallString<256> Name;
919	llvm::raw_svector_ostream Out(Name);
920	Out << (MD->isInstanceMethod() ? '-' : '+');
921	Out << '[';
922
923	// For incorrect code, there might not be an ObjCInterfaceDecl. Do
924	// a null check to avoid a crash.
925	if (const ObjCInterfaceDecl *ID = MD->getClassInterface())
926	Out << *ID;
927
928	if (const ObjCCategoryImplDecl *CID =
929	dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext()))
930	Out << '(' << *CID << ')';
931
932	Out << ' ';
933	MD->getSelector().print(OS&: Out);
934	Out << ']';
935
936	return std::string(Name);
937	}
938	if (isa<TranslationUnitDecl>(Val: CurrentDecl) &&
939	IK == PredefinedIdentKind::PrettyFunction) {
940	// __PRETTY_FUNCTION__ -> "top level", the others produce an empty string.
941	return "top level";
942	}
943	return "";
944	}
945
946	void APNumericStorage::setIntValue(const ASTContext &C,
947	const llvm::APInt &Val) {
948	if (hasAllocation())
949	C.Deallocate(Ptr: pVal);
950
951	BitWidth = Val.getBitWidth();
952	unsigned NumWords = Val.getNumWords();
953	const uint64_t* Words = Val.getRawData();
954	if (NumWords > 1) {
955	pVal = new (C) uint64_t[NumWords];
956	std::copy(first: Words, last: Words + NumWords, result: pVal);
957	} else if (NumWords == 1)
958	VAL = Words[0];
959	else
960	VAL = 0;
961	}
962
963	IntegerLiteral::IntegerLiteral(const ASTContext &C, const llvm::APInt &V,
964	QualType type, SourceLocation l)
965	: Expr(IntegerLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l) {
966	assert(type->isIntegerType() && "Illegal type in IntegerLiteral");
967	assert(V.getBitWidth() == C.getIntWidth(type) &&
968	"Integer type is not the correct size for constant.");
969	setValue(C, V);
970	setDependence(ExprDependence::None);
971	}
972
973	IntegerLiteral *
974	IntegerLiteral::Create(const ASTContext &C, const llvm::APInt &V,
975	QualType type, SourceLocation l) {
976	return new (C) IntegerLiteral(C, V, type, l);
977	}
978
979	IntegerLiteral *
980	IntegerLiteral::Create(const ASTContext &C, EmptyShell Empty) {
981	return new (C) IntegerLiteral(Empty);
982	}
983
984	FixedPointLiteral::FixedPointLiteral(const ASTContext &C, const llvm::APInt &V,
985	QualType type, SourceLocation l,
986	unsigned Scale)
987	: Expr(FixedPointLiteralClass, type, VK_PRValue, OK_Ordinary), Loc(l),
988	Scale(Scale) {
989	assert(type->isFixedPointType() && "Illegal type in FixedPointLiteral");
990	assert(V.getBitWidth() == C.getTypeInfo(type).Width &&
991	"Fixed point type is not the correct size for constant.");
992	setValue(C, V);
993	setDependence(ExprDependence::None);
994	}
995
996	FixedPointLiteral *FixedPointLiteral::CreateFromRawInt(const ASTContext &C,
997	const llvm::APInt &V,
998	QualType type,
999	SourceLocation l,
1000	unsigned Scale) {
1001	return new (C) FixedPointLiteral(C, V, type, l, Scale);
1002	}
1003
1004	FixedPointLiteral *FixedPointLiteral::Create(const ASTContext &C,
1005	EmptyShell Empty) {
1006	return new (C) FixedPointLiteral(Empty);
1007	}
1008
1009	std::string FixedPointLiteral::getValueAsString(unsigned Radix) const {
1010	// Currently the longest decimal number that can be printed is the max for an
1011	// unsigned long _Accum: 4294967295.99999999976716935634613037109375
1012	// which is 43 characters.
1013	SmallString<64> S;
1014	FixedPointValueToString(
1015	Str&: S, Val: llvm::APSInt::getUnsigned(X: getValue().getZExtValue()), Scale);
1016	return std::string(S);
1017	}
1018
1019	void CharacterLiteral::print(unsigned Val, CharacterLiteralKind Kind,
1020	raw_ostream &OS) {
1021	switch (Kind) {
1022	case CharacterLiteralKind::Ascii:
1023	break; // no prefix.
1024	case CharacterLiteralKind::Wide:
1025	OS << 'L';
1026	break;
1027	case CharacterLiteralKind::UTF8:
1028	OS << "u8";
1029	break;
1030	case CharacterLiteralKind::UTF16:
1031	OS << 'u';
1032	break;
1033	case CharacterLiteralKind::UTF32:
1034	OS << 'U';
1035	break;
1036	}
1037
1038	StringRef Escaped = escapeCStyle<EscapeChar::Single>(Ch: Val);
1039	if (!Escaped.empty()) {
1040	OS << "'" << Escaped << "'";
1041	} else {
1042	// A character literal might be sign-extended, which
1043	// would result in an invalid \U escape sequence.
1044	// FIXME: multicharacter literals such as '\xFF\xFF\xFF\xFF'
1045	// are not correctly handled.
1046	if ((Val & ~0xFFu) == ~0xFFu && Kind == CharacterLiteralKind::Ascii)
1047	Val &= 0xFFu;
1048	if (Val < 256 && isPrintable(c: (unsigned char)Val))
1049	OS << "'" << (char)Val << "'";
1050	else if (Val < 256)
1051	OS << "'\\x" << llvm::format(Fmt: "%02x", Vals: Val) << "'";
1052	else if (Val <= 0xFFFF)
1053	OS << "'\\u" << llvm::format(Fmt: "%04x", Vals: Val) << "'";
1054	else
1055	OS << "'\\U" << llvm::format(Fmt: "%08x", Vals: Val) << "'";
1056	}
1057	}
1058
1059	FloatingLiteral::FloatingLiteral(const ASTContext &C, const llvm::APFloat &V,
1060	bool isexact, QualType Type, SourceLocation L)
1061	: Expr(FloatingLiteralClass, Type, VK_PRValue, OK_Ordinary), Loc(L) {
1062	setSemantics(V.getSemantics());
1063	FloatingLiteralBits.IsExact = isexact;
1064	setValue(C, Val: V);
1065	setDependence(ExprDependence::None);
1066	}
1067
1068	FloatingLiteral::FloatingLiteral(const ASTContext &C, EmptyShell Empty)
1069	: Expr(FloatingLiteralClass, Empty) {
1070	setRawSemantics(llvm::APFloatBase::S_IEEEhalf);
1071	FloatingLiteralBits.IsExact = false;
1072	}
1073
1074	FloatingLiteral *
1075	FloatingLiteral::Create(const ASTContext &C, const llvm::APFloat &V,
1076	bool isexact, QualType Type, SourceLocation L) {
1077	return new (C) FloatingLiteral(C, V, isexact, Type, L);
1078	}
1079
1080	FloatingLiteral *
1081	FloatingLiteral::Create(const ASTContext &C, EmptyShell Empty) {
1082	return new (C) FloatingLiteral(C, Empty);
1083	}
1084
1085	/// getValueAsApproximateDouble - This returns the value as an inaccurate
1086	/// double. Note that this may cause loss of precision, but is useful for
1087	/// debugging dumps, etc.
1088	double FloatingLiteral::getValueAsApproximateDouble() const {
1089	llvm::APFloat V = getValue();
1090	bool ignored;
1091	V.convert(ToSemantics: llvm::APFloat::IEEEdouble(), RM: llvm::APFloat::rmNearestTiesToEven,
1092	losesInfo: &ignored);
1093	return V.convertToDouble();
1094	}
1095
1096	unsigned StringLiteral::mapCharByteWidth(TargetInfo const &Target,
1097	StringLiteralKind SK) {
1098	unsigned CharByteWidth = 0;
1099	switch (SK) {
1100	case StringLiteralKind::Ordinary:
1101	case StringLiteralKind::UTF8:
1102	case StringLiteralKind::Binary:
1103	CharByteWidth = Target.getCharWidth();
1104	break;
1105	case StringLiteralKind::Wide:
1106	CharByteWidth = Target.getWCharWidth();
1107	break;
1108	case StringLiteralKind::UTF16:
1109	CharByteWidth = Target.getChar16Width();
1110	break;
1111	case StringLiteralKind::UTF32:
1112	CharByteWidth = Target.getChar32Width();
1113	break;
1114	case StringLiteralKind::Unevaluated:
1115	return sizeof(char); // Host;
1116	}
1117	assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple");
1118	CharByteWidth /= 8;
1119	assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth == 4) &&
1120	"The only supported character byte widths are 1,2 and 4!");
1121	return CharByteWidth;
1122	}
1123
1124	StringLiteral::StringLiteral(const ASTContext &Ctx, StringRef Str,
1125	StringLiteralKind Kind, bool Pascal, QualType Ty,
1126	const SourceLocation *Loc,
1127	unsigned NumConcatenated)
1128	: Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary) {
1129
1130	unsigned Length = Str.size();
1131
1132	StringLiteralBits.Kind = llvm::to_underlying(E: Kind);
1133	StringLiteralBits.NumConcatenated = NumConcatenated;
1134
1135	if (Kind != StringLiteralKind::Unevaluated) {
1136	assert(Ctx.getAsConstantArrayType(Ty) &&
1137	"StringLiteral must be of constant array type!");
1138	unsigned CharByteWidth = mapCharByteWidth(Target: Ctx.getTargetInfo(), SK: Kind);
1139	unsigned ByteLength = Str.size();
1140	assert((ByteLength % CharByteWidth == 0) &&
1141	"The size of the data must be a multiple of CharByteWidth!");
1142
1143	// Avoid the expensive division. The compiler should be able to figure it
1144	// out by itself. However as of clang 7, even with the appropriate
1145	// llvm_unreachable added just here, it is not able to do so.
1146	switch (CharByteWidth) {
1147	case 1:
1148	Length = ByteLength;
1149	break;
1150	case 2:
1151	Length = ByteLength / 2;
1152	break;
1153	case 4:
1154	Length = ByteLength / 4;
1155	break;
1156	default:
1157	llvm_unreachable("Unsupported character width!");
1158	}
1159
1160	StringLiteralBits.CharByteWidth = CharByteWidth;
1161	StringLiteralBits.IsPascal = Pascal;
1162	} else {
1163	assert(!Pascal && "Can't make an unevaluated Pascal string");
1164	StringLiteralBits.CharByteWidth = 1;
1165	StringLiteralBits.IsPascal = false;
1166	}
1167
1168	*getTrailingObjects<unsigned>() = Length;
1169
1170	// Initialize the trailing array of SourceLocation.
1171	// This is safe since SourceLocation is POD-like.
1172	std::memcpy(dest: getTrailingObjects<SourceLocation>(), src: Loc,
1173	n: NumConcatenated * sizeof(SourceLocation));
1174
1175	// Initialize the trailing array of char holding the string data.
1176	std::memcpy(dest: getTrailingObjects<char>(), src: Str.data(), n: Str.size());
1177
1178	setDependence(ExprDependence::None);
1179	}
1180
1181	StringLiteral::StringLiteral(EmptyShell Empty, unsigned NumConcatenated,
1182	unsigned Length, unsigned CharByteWidth)
1183	: Expr(StringLiteralClass, Empty) {
1184	StringLiteralBits.CharByteWidth = CharByteWidth;
1185	StringLiteralBits.NumConcatenated = NumConcatenated;
1186	*getTrailingObjects<unsigned>() = Length;
1187	}
1188
1189	StringLiteral *StringLiteral::Create(const ASTContext &Ctx, StringRef Str,
1190	StringLiteralKind Kind, bool Pascal,
1191	QualType Ty, const SourceLocation *Loc,
1192	unsigned NumConcatenated) {
1193	void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1194	Counts: 1, Counts: NumConcatenated, Counts: Str.size()),
1195	Align: alignof(StringLiteral));
1196	return new (Mem)
1197	StringLiteral(Ctx, Str, Kind, Pascal, Ty, Loc, NumConcatenated);
1198	}
1199
1200	StringLiteral *StringLiteral::CreateEmpty(const ASTContext &Ctx,
1201	unsigned NumConcatenated,
1202	unsigned Length,
1203	unsigned CharByteWidth) {
1204	void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<unsigned, SourceLocation, char>(
1205	Counts: 1, Counts: NumConcatenated, Counts: Length * CharByteWidth),
1206	Align: alignof(StringLiteral));
1207	return new (Mem)
1208	StringLiteral(EmptyShell(), NumConcatenated, Length, CharByteWidth);
1209	}
1210
1211	void StringLiteral::outputString(raw_ostream &OS) const {
1212	switch (getKind()) {
1213	case StringLiteralKind::Unevaluated:
1214	case StringLiteralKind::Ordinary:
1215	case StringLiteralKind::Binary:
1216	break; // no prefix.
1217	case StringLiteralKind::Wide:
1218	OS << 'L';
1219	break;
1220	case StringLiteralKind::UTF8:
1221	OS << "u8";
1222	break;
1223	case StringLiteralKind::UTF16:
1224	OS << 'u';
1225	break;
1226	case StringLiteralKind::UTF32:
1227	OS << 'U';
1228	break;
1229	}
1230	OS << '"';
1231	static const char Hex[] = "0123456789ABCDEF";
1232
1233	unsigned LastSlashX = getLength();
1234	for (unsigned I = 0, N = getLength(); I != N; ++I) {
1235	uint32_t Char = getCodeUnit(i: I);
1236	StringRef Escaped = escapeCStyle<EscapeChar::Double>(Ch: Char);
1237	if (Escaped.empty()) {
1238	// FIXME: Convert UTF-8 back to codepoints before rendering.
1239
1240	// Convert UTF-16 surrogate pairs back to codepoints before rendering.
1241	// Leave invalid surrogates alone; we'll use \x for those.
1242	if (getKind() == StringLiteralKind::UTF16 && I != N - 1 &&
1243	Char >= 0xd800 && Char <= 0xdbff) {
1244	uint32_t Trail = getCodeUnit(i: I + 1);
1245	if (Trail >= 0xdc00 && Trail <= 0xdfff) {
1246	Char = 0x10000 + ((Char - 0xd800) << 10) + (Trail - 0xdc00);
1247	++I;
1248	}
1249	}
1250
1251	if (Char > 0xff) {
1252	// If this is a wide string, output characters over 0xff using \x
1253	// escapes. Otherwise, this is a UTF-16 or UTF-32 string, and Char is a
1254	// codepoint: use \x escapes for invalid codepoints.
1255	if (getKind() == StringLiteralKind::Wide ||
1256	(Char >= 0xd800 && Char <= 0xdfff) || Char >= 0x110000) {
1257	// FIXME: Is this the best way to print wchar_t?
1258	OS << "\\x";
1259	int Shift = 28;
1260	while ((Char >> Shift) == 0)
1261	Shift -= 4;
1262	for (/**/; Shift >= 0; Shift -= 4)
1263	OS << Hex[(Char >> Shift) & 15];
1264	LastSlashX = I;
1265	continue;
1266	}
1267
1268	if (Char > 0xffff)
1269	OS << "\\U00"
1270	<< Hex[(Char >> 20) & 15]
1271	<< Hex[(Char >> 16) & 15];
1272	else
1273	OS << "\\u";
1274	OS << Hex[(Char >> 12) & 15]
1275	<< Hex[(Char >> 8) & 15]
1276	<< Hex[(Char >> 4) & 15]
1277	<< Hex[(Char >> 0) & 15];
1278	continue;
1279	}
1280
1281	// If we used \x... for the previous character, and this character is a
1282	// hexadecimal digit, prevent it being slurped as part of the \x.
1283	if (LastSlashX + 1 == I) {
1284	switch (Char) {
1285	case '0': case '1': case '2': case '3': case '4':
1286	case '5': case '6': case '7': case '8': case '9':
1287	case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
1288	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
1289	OS << "\"\"";
1290	}
1291	}
1292
1293	assert(Char <= 0xff &&
1294	"Characters above 0xff should already have been handled.");
1295
1296	if (isPrintable(c: Char))
1297	OS << (char)Char;
1298	else // Output anything hard as an octal escape.
1299	OS << '\\'
1300	<< (char)('0' + ((Char >> 6) & 7))
1301	<< (char)('0' + ((Char >> 3) & 7))
1302	<< (char)('0' + ((Char >> 0) & 7));
1303	} else {
1304	// Handle some common non-printable cases to make dumps prettier.
1305	OS << Escaped;
1306	}
1307	}
1308	OS << '"';
1309	}
1310
1311	/// getLocationOfByte - Return a source location that points to the specified
1312	/// byte of this string literal.
1313	///
1314	/// Strings are amazingly complex. They can be formed from multiple tokens and
1315	/// can have escape sequences in them in addition to the usual trigraph and
1316	/// escaped newline business. This routine handles this complexity.
1317	///
1318	/// The *StartToken sets the first token to be searched in this function and
1319	/// the *StartTokenByteOffset is the byte offset of the first token. Before
1320	/// returning, it updates the *StartToken to the TokNo of the token being found
1321	/// and sets *StartTokenByteOffset to the byte offset of the token in the
1322	/// string.
1323	/// Using these two parameters can reduce the time complexity from O(n^2) to
1324	/// O(n) if one wants to get the location of byte for all the tokens in a
1325	/// string.
1326	///
1327	SourceLocation
1328	StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1329	const LangOptions &Features,
1330	const TargetInfo &Target, unsigned *StartToken,
1331	unsigned *StartTokenByteOffset) const {
1332	// No source location of bytes for binary literals since they don't come from
1333	// source.
1334	if (getKind() == StringLiteralKind::Binary)
1335	return getStrTokenLoc(TokNum: 0);
1336
1337	assert((getKind() == StringLiteralKind::Ordinary ||
1338	getKind() == StringLiteralKind::UTF8 ||
1339	getKind() == StringLiteralKind::Unevaluated) &&
1340	"Only narrow string literals are currently supported");
1341
1342	// Loop over all of the tokens in this string until we find the one that
1343	// contains the byte we're looking for.
1344	unsigned TokNo = 0;
1345	unsigned StringOffset = 0;
1346	if (StartToken)
1347	TokNo = *StartToken;
1348	if (StartTokenByteOffset) {
1349	StringOffset = *StartTokenByteOffset;
1350	ByteNo -= StringOffset;
1351	}
1352	while (true) {
1353	assert(TokNo < getNumConcatenated() && "Invalid byte number!");
1354	SourceLocation StrTokLoc = getStrTokenLoc(TokNum: TokNo);
1355
1356	// Get the spelling of the string so that we can get the data that makes up
1357	// the string literal, not the identifier for the macro it is potentially
1358	// expanded through.
1359	SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(Loc: StrTokLoc);
1360
1361	// Re-lex the token to get its length and original spelling.
1362	std::pair<FileID, unsigned> LocInfo =
1363	SM.getDecomposedLoc(Loc: StrTokSpellingLoc);
1364	bool Invalid = false;
1365	StringRef Buffer = SM.getBufferData(FID: LocInfo.first, Invalid: &Invalid);
1366	if (Invalid) {
1367	if (StartTokenByteOffset != nullptr)
1368	*StartTokenByteOffset = StringOffset;
1369	if (StartToken != nullptr)
1370	*StartToken = TokNo;
1371	return StrTokSpellingLoc;
1372	}
1373
1374	const char *StrData = Buffer.data()+LocInfo.second;
1375
1376	// Create a lexer starting at the beginning of this token.
1377	Lexer TheLexer(SM.getLocForStartOfFile(FID: LocInfo.first), Features,
1378	Buffer.begin(), StrData, Buffer.end());
1379	Token TheTok;
1380	TheLexer.LexFromRawLexer(Result&: TheTok);
1381
1382	// Use the StringLiteralParser to compute the length of the string in bytes.
1383	StringLiteralParser SLP(TheTok, SM, Features, Target);
1384	unsigned TokNumBytes = SLP.GetStringLength();
1385
1386	// If the byte is in this token, return the location of the byte.
1387	if (ByteNo < TokNumBytes ||
1388	(ByteNo == TokNumBytes && TokNo == getNumConcatenated() - 1)) {
1389	unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo);
1390
1391	// Now that we know the offset of the token in the spelling, use the
1392	// preprocessor to get the offset in the original source.
1393	if (StartTokenByteOffset != nullptr)
1394	*StartTokenByteOffset = StringOffset;
1395	if (StartToken != nullptr)
1396	*StartToken = TokNo;
1397	return Lexer::AdvanceToTokenCharacter(TokStart: StrTokLoc, Characters: Offset, SM, LangOpts: Features);
1398	}
1399
1400	// Move to the next string token.
1401	StringOffset += TokNumBytes;
1402	++TokNo;
1403	ByteNo -= TokNumBytes;
1404	}
1405	}
1406
1407	/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
1408	/// corresponds to, e.g. "sizeof" or "[pre]++".
1409	StringRef UnaryOperator::getOpcodeStr(Opcode Op) {
1410	switch (Op) {
1411	#define UNARY_OPERATION(Name, Spelling) case UO_##Name: return Spelling;
1412	#include "clang/AST/OperationKinds.def"
1413	}
1414	llvm_unreachable("Unknown unary operator");
1415	}
1416
1417	UnaryOperatorKind
1418	UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) {
1419	switch (OO) {
1420	default: llvm_unreachable("No unary operator for overloaded function");
1421	case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc;
1422	case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec;
1423	case OO_Amp: return UO_AddrOf;
1424	case OO_Star: return UO_Deref;
1425	case OO_Plus: return UO_Plus;
1426	case OO_Minus: return UO_Minus;
1427	case OO_Tilde: return UO_Not;
1428	case OO_Exclaim: return UO_LNot;
1429	case OO_Coawait: return UO_Coawait;
1430	}
1431	}
1432
1433	OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) {
1434	switch (Opc) {
1435	case UO_PostInc: case UO_PreInc: return OO_PlusPlus;
1436	case UO_PostDec: case UO_PreDec: return OO_MinusMinus;
1437	case UO_AddrOf: return OO_Amp;
1438	case UO_Deref: return OO_Star;
1439	case UO_Plus: return OO_Plus;
1440	case UO_Minus: return OO_Minus;
1441	case UO_Not: return OO_Tilde;
1442	case UO_LNot: return OO_Exclaim;
1443	case UO_Coawait: return OO_Coawait;
1444	default: return OO_None;
1445	}
1446	}
1447
1448
1449	//===----------------------------------------------------------------------===//
1450	// Postfix Operators.
1451	//===----------------------------------------------------------------------===//
1452	#ifndef NDEBUG
1453	static unsigned SizeOfCallExprInstance(Expr::StmtClass SC) {
1454	switch (SC) {
1455	case Expr::CallExprClass:
1456	return sizeof(CallExpr);
1457	case Expr::CXXOperatorCallExprClass:
1458	return sizeof(CXXOperatorCallExpr);
1459	case Expr::CXXMemberCallExprClass:
1460	return sizeof(CXXMemberCallExpr);
1461	case Expr::UserDefinedLiteralClass:
1462	return sizeof(UserDefinedLiteral);
1463	case Expr::CUDAKernelCallExprClass:
1464	return sizeof(CUDAKernelCallExpr);
1465	default:
1466	llvm_unreachable("unexpected class deriving from CallExpr!");
1467	}
1468	}
1469	#endif
1470
1471	// changing the size of SourceLocation, CallExpr, and
1472	// subclasses requires careful considerations
1473	static_assert(sizeof(SourceLocation) == 4 && sizeof(CXXOperatorCallExpr) <= 32,
1474	"we assume CXXOperatorCallExpr is at most 32 bytes");
1475
1476	CallExpr::CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
1477	ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1478	SourceLocation RParenLoc, FPOptionsOverride FPFeatures,
1479	unsigned MinNumArgs, ADLCallKind UsesADL)
1480	: Expr(SC, Ty, VK, OK_Ordinary), RParenLoc(RParenLoc) {
1481	NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1482	unsigned NumPreArgs = PreArgs.size();
1483	CallExprBits.NumPreArgs = NumPreArgs;
1484	assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1485	assert(SizeOfCallExprInstance(SC) <= OffsetToTrailingObjects &&
1486	"This CallExpr subclass is too big or unsupported");
1487
1488	CallExprBits.UsesADL = static_cast<bool>(UsesADL);
1489
1490	setCallee(Fn);
1491	for (unsigned I = 0; I != NumPreArgs; ++I)
1492	setPreArg(I, PreArgs[I]);
1493	for (unsigned I = 0; I != Args.size(); ++I)
1494	setArg(Arg: I, ArgExpr: Args[I]);
1495	for (unsigned I = Args.size(); I != NumArgs; ++I)
1496	setArg(Arg: I, ArgExpr: nullptr);
1497
1498	this->computeDependence();
1499
1500	CallExprBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
1501	CallExprBits.IsCoroElideSafe = false;
1502	CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1503	CallExprBits.HasTrailingSourceLoc = false;
1504
1505	if (hasStoredFPFeatures())
1506	setStoredFPFeatures(FPFeatures);
1507	}
1508
1509	CallExpr::CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
1510	bool HasFPFeatures, EmptyShell Empty)
1511	: Expr(SC, Empty), NumArgs(NumArgs) {
1512	CallExprBits.NumPreArgs = NumPreArgs;
1513	assert((NumPreArgs == getNumPreArgs()) && "NumPreArgs overflow!");
1514	CallExprBits.HasFPFeatures = HasFPFeatures;
1515	CallExprBits.IsCoroElideSafe = false;
1516	CallExprBits.ExplicitObjectMemFunUsingMemberSyntax = false;
1517	CallExprBits.HasTrailingSourceLoc = false;
1518	}
1519
1520	CallExpr *CallExpr::Create(const ASTContext &Ctx, Expr *Fn,
1521	ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
1522	SourceLocation RParenLoc,
1523	FPOptionsOverride FPFeatures, unsigned MinNumArgs,
1524	ADLCallKind UsesADL) {
1525	unsigned NumArgs = std::max<unsigned>(a: Args.size(), b: MinNumArgs);
1526	unsigned SizeOfTrailingObjects = CallExpr::sizeOfTrailingObjects(
1527	/*NumPreArgs=*/0, NumArgs, HasFPFeatures: FPFeatures.requiresTrailingStorage());
1528	void *Mem = Ctx.Allocate(
1529	Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1530	Align: alignof(CallExpr));
1531	CallExpr *E =
1532	new (Mem) CallExpr(CallExprClass, Fn, /*PreArgs=*/{}, Args, Ty, VK,
1533	RParenLoc, FPFeatures, MinNumArgs, UsesADL);
1534	E->updateTrailingSourceLoc();
1535	return E;
1536	}
1537
1538	CallExpr *CallExpr::CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
1539	bool HasFPFeatures, EmptyShell Empty) {
1540	unsigned SizeOfTrailingObjects =
1541	CallExpr::sizeOfTrailingObjects(/*NumPreArgs=*/0, NumArgs, HasFPFeatures);
1542	void *Mem = Ctx.Allocate(
1543	Size: sizeToAllocateForCallExprSubclass<CallExpr>(SizeOfTrailingObjects),
1544	Align: alignof(CallExpr));
1545	return new (Mem)
1546	CallExpr(CallExprClass, /*NumPreArgs=*/0, NumArgs, HasFPFeatures, Empty);
1547	}
1548
1549	Decl *Expr::getReferencedDeclOfCallee() {
1550
1551	// Optimize for the common case first
1552	// (simple function or member function call)
1553	// then try more exotic possibilities.
1554	Expr *CEE = IgnoreImpCasts();
1555
1556	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1557	return DRE->getDecl();
1558
1559	if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1560	return ME->getMemberDecl();
1561
1562	CEE = CEE->IgnoreParens();
1563
1564	while (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: CEE))
1565	CEE = NTTP->getReplacement()->IgnoreParenImpCasts();
1566
1567	// If we're calling a dereference, look at the pointer instead.
1568	while (true) {
1569	if (auto *BO = dyn_cast<BinaryOperator>(Val: CEE)) {
1570	if (BO->isPtrMemOp()) {
1571	CEE = BO->getRHS()->IgnoreParenImpCasts();
1572	continue;
1573	}
1574	} else if (auto *UO = dyn_cast<UnaryOperator>(Val: CEE)) {
1575	if (UO->getOpcode() == UO_Deref || UO->getOpcode() == UO_AddrOf ||
1576	UO->getOpcode() == UO_Plus) {
1577	CEE = UO->getSubExpr()->IgnoreParenImpCasts();
1578	continue;
1579	}
1580	}
1581	break;
1582	}
1583
1584	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: CEE))
1585	return DRE->getDecl();
1586	if (auto *ME = dyn_cast<MemberExpr>(Val: CEE))
1587	return ME->getMemberDecl();
1588	if (auto *BE = dyn_cast<BlockExpr>(Val: CEE))
1589	return BE->getBlockDecl();
1590
1591	return nullptr;
1592	}
1593
1594	/// If this is a call to a builtin, return the builtin ID. If not, return 0.
1595	unsigned CallExpr::getBuiltinCallee() const {
1596	const auto *FDecl = getDirectCallee();
1597	return FDecl ? FDecl->getBuiltinID() : 0;
1598	}
1599
1600	bool CallExpr::isUnevaluatedBuiltinCall(const ASTContext &Ctx) const {
1601	if (unsigned BI = getBuiltinCallee())
1602	return Ctx.BuiltinInfo.isUnevaluated(ID: BI);
1603	return false;
1604	}
1605
1606	QualType CallExpr::getCallReturnType(const ASTContext &Ctx) const {
1607	const Expr *Callee = getCallee();
1608	QualType CalleeType = Callee->getType();
1609	if (const auto *FnTypePtr = CalleeType->getAs<PointerType>()) {
1610	CalleeType = FnTypePtr->getPointeeType();
1611	} else if (const auto *BPT = CalleeType->getAs<BlockPointerType>()) {
1612	CalleeType = BPT->getPointeeType();
1613	} else if (CalleeType->isSpecificPlaceholderType(K: BuiltinType::BoundMember)) {
1614	if (isa<CXXPseudoDestructorExpr>(Val: Callee->IgnoreParens()))
1615	return Ctx.VoidTy;
1616
1617	if (isa<UnresolvedMemberExpr>(Val: Callee->IgnoreParens()))
1618	return Ctx.DependentTy;
1619
1620	// This should never be overloaded and so should never return null.
1621	CalleeType = Expr::findBoundMemberType(expr: Callee);
1622	assert(!CalleeType.isNull());
1623	} else if (CalleeType->isRecordType()) {
1624	// If the Callee is a record type, then it is a not-yet-resolved
1625	// dependent call to the call operator of that type.
1626	return Ctx.DependentTy;
1627	} else if (CalleeType->isDependentType() ||
1628	CalleeType->isSpecificPlaceholderType(K: BuiltinType::Overload)) {
1629	return Ctx.DependentTy;
1630	}
1631
1632	const FunctionType *FnType = CalleeType->castAs<FunctionType>();
1633	return FnType->getReturnType();
1634	}
1635
1636	std::pair<const NamedDecl *, const Attr *>
1637	CallExpr::getUnusedResultAttr(const ASTContext &Ctx) const {
1638	// If the callee is marked nodiscard, return that attribute
1639	if (const Decl *D = getCalleeDecl())
1640	if (const auto *A = D->getAttr<WarnUnusedResultAttr>())
1641	return {nullptr, A};
1642
1643	// If the return type is a struct, union, or enum that is marked nodiscard,
1644	// then return the return type attribute.
1645	if (const TagDecl *TD = getCallReturnType(Ctx)->getAsTagDecl())
1646	if (const auto *A = TD->getAttr<WarnUnusedResultAttr>())
1647	return {TD, A};
1648
1649	for (const auto *TD = getCallReturnType(Ctx)->getAs<TypedefType>(); TD;
1650	TD = TD->desugar()->getAs<TypedefType>())
1651	if (const auto *A = TD->getDecl()->getAttr<WarnUnusedResultAttr>())
1652	return {TD->getDecl(), A};
1653	return {nullptr, nullptr};
1654	}
1655
1656	OffsetOfExpr *OffsetOfExpr::Create(const ASTContext &C, QualType type,
1657	SourceLocation OperatorLoc,
1658	TypeSourceInfo *tsi,
1659	ArrayRef<OffsetOfNode> comps,
1660	ArrayRef<Expr*> exprs,
1661	SourceLocation RParenLoc) {
1662	void *Mem = C.Allocate(
1663	Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: comps.size(), Counts: exprs.size()));
1664
1665	return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, comps, exprs,
1666	RParenLoc);
1667	}
1668
1669	OffsetOfExpr *OffsetOfExpr::CreateEmpty(const ASTContext &C,
1670	unsigned numComps, unsigned numExprs) {
1671	void *Mem =
1672	C.Allocate(Size: totalSizeToAlloc<OffsetOfNode, Expr *>(Counts: numComps, Counts: numExprs));
1673	return new (Mem) OffsetOfExpr(numComps, numExprs);
1674	}
1675
1676	OffsetOfExpr::OffsetOfExpr(const ASTContext &C, QualType type,
1677	SourceLocation OperatorLoc, TypeSourceInfo *tsi,
1678	ArrayRef<OffsetOfNode> comps, ArrayRef<Expr *> exprs,
1679	SourceLocation RParenLoc)
1680	: Expr(OffsetOfExprClass, type, VK_PRValue, OK_Ordinary),
1681	OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi),
1682	NumComps(comps.size()), NumExprs(exprs.size()) {
1683	for (unsigned i = 0; i != comps.size(); ++i)
1684	setComponent(Idx: i, ON: comps[i]);
1685	for (unsigned i = 0; i != exprs.size(); ++i)
1686	setIndexExpr(Idx: i, E: exprs[i]);
1687
1688	setDependence(computeDependence(E: this));
1689	}
1690
1691	IdentifierInfo *OffsetOfNode::getFieldName() const {
1692	assert(getKind() == Field || getKind() == Identifier);
1693	if (getKind() == Field)
1694	return getField()->getIdentifier();
1695
1696	return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask);
1697	}
1698
1699	UnaryExprOrTypeTraitExpr::UnaryExprOrTypeTraitExpr(
1700	UnaryExprOrTypeTrait ExprKind, Expr *E, QualType resultType,
1701	SourceLocation op, SourceLocation rp)
1702	: Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_PRValue, OK_Ordinary),
1703	OpLoc(op), RParenLoc(rp) {
1704	assert(ExprKind <= UETT_Last && "invalid enum value!");
1705	UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
1706	assert(static_cast<unsigned>(ExprKind) == UnaryExprOrTypeTraitExprBits.Kind &&
1707	"UnaryExprOrTypeTraitExprBits.Kind overflow!");
1708	UnaryExprOrTypeTraitExprBits.IsType = false;
1709	Argument.Ex = E;
1710	setDependence(computeDependence(E: this));
1711	}
1712
1713	MemberExpr::MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1714	NestedNameSpecifierLoc QualifierLoc,
1715	SourceLocation TemplateKWLoc, ValueDecl *MemberDecl,
1716	DeclAccessPair FoundDecl,
1717	const DeclarationNameInfo &NameInfo,
1718	const TemplateArgumentListInfo *TemplateArgs, QualType T,
1719	ExprValueKind VK, ExprObjectKind OK,
1720	NonOdrUseReason NOUR)
1721	: Expr(MemberExprClass, T, VK, OK), Base(Base), MemberDecl(MemberDecl),
1722	MemberDNLoc(NameInfo.getInfo()), MemberLoc(NameInfo.getLoc()) {
1723	assert(!NameInfo.getName() ||
1724	MemberDecl->getDeclName() == NameInfo.getName());
1725	MemberExprBits.IsArrow = IsArrow;
1726	MemberExprBits.HasQualifier = QualifierLoc.hasQualifier();
1727	MemberExprBits.HasFoundDecl =
1728	FoundDecl.getDecl() != MemberDecl ||
1729	FoundDecl.getAccess() != MemberDecl->getAccess();
1730	MemberExprBits.HasTemplateKWAndArgsInfo =
1731	TemplateArgs || TemplateKWLoc.isValid();
1732	MemberExprBits.HadMultipleCandidates = false;
1733	MemberExprBits.NonOdrUseReason = NOUR;
1734	MemberExprBits.OperatorLoc = OperatorLoc;
1735
1736	if (hasQualifier())
1737	new (getTrailingObjects<NestedNameSpecifierLoc>())
1738	NestedNameSpecifierLoc(QualifierLoc);
1739	if (hasFoundDecl())
1740	*getTrailingObjects<DeclAccessPair>() = FoundDecl;
1741	if (TemplateArgs) {
1742	auto Deps = TemplateArgumentDependence::None;
1743	getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1744	TemplateKWLoc, *TemplateArgs, getTrailingObjects<TemplateArgumentLoc>(),
1745	Deps);
1746	} else if (TemplateKWLoc.isValid()) {
1747	getTrailingObjects<ASTTemplateKWAndArgsInfo>()->initializeFrom(
1748	TemplateKWLoc);
1749	}
1750	setDependence(computeDependence(E: this));
1751	}
1752
1753	MemberExpr *MemberExpr::Create(
1754	const ASTContext &C, Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
1755	NestedNameSpecifierLoc QualifierLoc, SourceLocation TemplateKWLoc,
1756	ValueDecl *MemberDecl, DeclAccessPair FoundDecl,
1757	DeclarationNameInfo NameInfo, const TemplateArgumentListInfo *TemplateArgs,
1758	QualType T, ExprValueKind VK, ExprObjectKind OK, NonOdrUseReason NOUR) {
1759	bool HasQualifier = QualifierLoc.hasQualifier();
1760	bool HasFoundDecl = FoundDecl.getDecl() != MemberDecl ||
1761	FoundDecl.getAccess() != MemberDecl->getAccess();
1762	bool HasTemplateKWAndArgsInfo = TemplateArgs || TemplateKWLoc.isValid();
1763	std::size_t Size =
1764	totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1765	ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1766	Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1767	Counts: TemplateArgs ? TemplateArgs->size() : 0);
1768
1769	void *Mem = C.Allocate(Size, Align: alignof(MemberExpr));
1770	return new (Mem) MemberExpr(Base, IsArrow, OperatorLoc, QualifierLoc,
1771	TemplateKWLoc, MemberDecl, FoundDecl, NameInfo,
1772	TemplateArgs, T, VK, OK, NOUR);
1773	}
1774
1775	MemberExpr *MemberExpr::CreateEmpty(const ASTContext &Context,
1776	bool HasQualifier, bool HasFoundDecl,
1777	bool HasTemplateKWAndArgsInfo,
1778	unsigned NumTemplateArgs) {
1779	assert((!NumTemplateArgs || HasTemplateKWAndArgsInfo) &&
1780	"template args but no template arg info?");
1781	std::size_t Size =
1782	totalSizeToAlloc<NestedNameSpecifierLoc, DeclAccessPair,
1783	ASTTemplateKWAndArgsInfo, TemplateArgumentLoc>(
1784	Counts: HasQualifier, Counts: HasFoundDecl, Counts: HasTemplateKWAndArgsInfo,
1785	Counts: NumTemplateArgs);
1786	void *Mem = Context.Allocate(Size, Align: alignof(MemberExpr));
1787	return new (Mem) MemberExpr(EmptyShell());
1788	}
1789
1790	void MemberExpr::setMemberDecl(ValueDecl *NewD) {
1791	MemberDecl = NewD;
1792	if (getType()->isUndeducedType())
1793	setType(NewD->getType());
1794	setDependence(computeDependence(E: this));
1795	}
1796
1797	SourceLocation MemberExpr::getBeginLoc() const {
1798	if (isImplicitAccess()) {
1799	if (hasQualifier())
1800	return getQualifierLoc().getBeginLoc();
1801	return MemberLoc;
1802	}
1803
1804	// FIXME: We don't want this to happen. Rather, we should be able to
1805	// detect all kinds of implicit accesses more cleanly.
1806	SourceLocation BaseStartLoc = getBase()->getBeginLoc();
1807	if (BaseStartLoc.isValid())
1808	return BaseStartLoc;
1809	return MemberLoc;
1810	}
1811	SourceLocation MemberExpr::getEndLoc() const {
1812	SourceLocation EndLoc = getMemberNameInfo().getEndLoc();
1813	if (hasExplicitTemplateArgs())
1814	EndLoc = getRAngleLoc();
1815	else if (EndLoc.isInvalid())
1816	EndLoc = getBase()->getEndLoc();
1817	return EndLoc;
1818	}
1819
1820	bool CastExpr::CastConsistency() const {
1821	switch (getCastKind()) {
1822	case CK_DerivedToBase:
1823	case CK_UncheckedDerivedToBase:
1824	case CK_DerivedToBaseMemberPointer:
1825	case CK_BaseToDerived:
1826	case CK_BaseToDerivedMemberPointer:
1827	assert(!path_empty() && "Cast kind should have a base path!");
1828	break;
1829
1830	case CK_CPointerToObjCPointerCast:
1831	assert(getType()->isObjCObjectPointerType());
1832	assert(getSubExpr()->getType()->isPointerType());
1833	goto CheckNoBasePath;
1834
1835	case CK_BlockPointerToObjCPointerCast:
1836	assert(getType()->isObjCObjectPointerType());
1837	assert(getSubExpr()->getType()->isBlockPointerType());
1838	goto CheckNoBasePath;
1839
1840	case CK_ReinterpretMemberPointer:
1841	assert(getType()->isMemberPointerType());
1842	assert(getSubExpr()->getType()->isMemberPointerType());
1843	goto CheckNoBasePath;
1844
1845	case CK_BitCast:
1846	// Arbitrary casts to C pointer types count as bitcasts.
1847	// Otherwise, we should only have block and ObjC pointer casts
1848	// here if they stay within the type kind.
1849	if (!getType()->isPointerType()) {
1850	assert(getType()->isObjCObjectPointerType() ==
1851	getSubExpr()->getType()->isObjCObjectPointerType());
1852	assert(getType()->isBlockPointerType() ==
1853	getSubExpr()->getType()->isBlockPointerType());
1854	}
1855	goto CheckNoBasePath;
1856
1857	case CK_AnyPointerToBlockPointerCast:
1858	assert(getType()->isBlockPointerType());
1859	assert(getSubExpr()->getType()->isAnyPointerType() &&
1860	!getSubExpr()->getType()->isBlockPointerType());
1861	goto CheckNoBasePath;
1862
1863	case CK_CopyAndAutoreleaseBlockObject:
1864	assert(getType()->isBlockPointerType());
1865	assert(getSubExpr()->getType()->isBlockPointerType());
1866	goto CheckNoBasePath;
1867
1868	case CK_FunctionToPointerDecay:
1869	assert(getType()->isPointerType());
1870	assert(getSubExpr()->getType()->isFunctionType());
1871	goto CheckNoBasePath;
1872
1873	case CK_AddressSpaceConversion: {
1874	auto Ty = getType();
1875	auto SETy = getSubExpr()->getType();
1876	assert(getValueKindForType(Ty) == Expr::getValueKindForType(SETy));
1877	if (isPRValue() && !Ty->isDependentType() && !SETy->isDependentType()) {
1878	Ty = Ty->getPointeeType();
1879	SETy = SETy->getPointeeType();
1880	}
1881	assert((Ty->isDependentType() || SETy->isDependentType()) ||
1882	(!Ty.isNull() && !SETy.isNull() &&
1883	Ty.getAddressSpace() != SETy.getAddressSpace()));
1884	goto CheckNoBasePath;
1885	}
1886	// These should not have an inheritance path.
1887	case CK_Dynamic:
1888	case CK_ToUnion:
1889	case CK_ArrayToPointerDecay:
1890	case CK_NullToMemberPointer:
1891	case CK_NullToPointer:
1892	case CK_ConstructorConversion:
1893	case CK_IntegralToPointer:
1894	case CK_PointerToIntegral:
1895	case CK_ToVoid:
1896	case CK_VectorSplat:
1897	case CK_IntegralCast:
1898	case CK_BooleanToSignedIntegral:
1899	case CK_IntegralToFloating:
1900	case CK_FloatingToIntegral:
1901	case CK_FloatingCast:
1902	case CK_ObjCObjectLValueCast:
1903	case CK_FloatingRealToComplex:
1904	case CK_FloatingComplexToReal:
1905	case CK_FloatingComplexCast:
1906	case CK_FloatingComplexToIntegralComplex:
1907	case CK_IntegralRealToComplex:
1908	case CK_IntegralComplexToReal:
1909	case CK_IntegralComplexCast:
1910	case CK_IntegralComplexToFloatingComplex:
1911	case CK_ARCProduceObject:
1912	case CK_ARCConsumeObject:
1913	case CK_ARCReclaimReturnedObject:
1914	case CK_ARCExtendBlockObject:
1915	case CK_ZeroToOCLOpaqueType:
1916	case CK_IntToOCLSampler:
1917	case CK_FloatingToFixedPoint:
1918	case CK_FixedPointToFloating:
1919	case CK_FixedPointCast:
1920	case CK_FixedPointToIntegral:
1921	case CK_IntegralToFixedPoint:
1922	case CK_MatrixCast:
1923	assert(!getType()->isBooleanType() && "unheralded conversion to bool");
1924	goto CheckNoBasePath;
1925
1926	case CK_Dependent:
1927	case CK_LValueToRValue:
1928	case CK_NoOp:
1929	case CK_AtomicToNonAtomic:
1930	case CK_NonAtomicToAtomic:
1931	case CK_PointerToBoolean:
1932	case CK_IntegralToBoolean:
1933	case CK_FloatingToBoolean:
1934	case CK_MemberPointerToBoolean:
1935	case CK_FloatingComplexToBoolean:
1936	case CK_IntegralComplexToBoolean:
1937	case CK_LValueBitCast: // -> bool&
1938	case CK_LValueToRValueBitCast:
1939	case CK_UserDefinedConversion: // operator bool()
1940	case CK_BuiltinFnToFnPtr:
1941	case CK_FixedPointToBoolean:
1942	case CK_HLSLArrayRValue:
1943	case CK_HLSLVectorTruncation:
1944	case CK_HLSLElementwiseCast:
1945	case CK_HLSLAggregateSplatCast:
1946	CheckNoBasePath:
1947	assert(path_empty() && "Cast kind should not have a base path!");
1948	break;
1949	}
1950	return true;
1951	}
1952
1953	const char *CastExpr::getCastKindName(CastKind CK) {
1954	switch (CK) {
1955	#define CAST_OPERATION(Name) case CK_##Name: return #Name;
1956	#include "clang/AST/OperationKinds.def"
1957	}
1958	llvm_unreachable("Unhandled cast kind!");
1959	}
1960
1961	namespace {
1962	// Skip over implicit nodes produced as part of semantic analysis.
1963	// Designed for use with IgnoreExprNodes.
1964	static Expr *ignoreImplicitSemaNodes(Expr *E) {
1965	if (auto *Materialize = dyn_cast<MaterializeTemporaryExpr>(Val: E))
1966	return Materialize->getSubExpr();
1967
1968	if (auto *Binder = dyn_cast<CXXBindTemporaryExpr>(Val: E))
1969	return Binder->getSubExpr();
1970
1971	if (auto *Full = dyn_cast<FullExpr>(Val: E))
1972	return Full->getSubExpr();
1973
1974	if (auto *CPLIE = dyn_cast<CXXParenListInitExpr>(Val: E);
1975	CPLIE && CPLIE->getInitExprs().size() == 1)
1976	return CPLIE->getInitExprs()[0];
1977
1978	return E;
1979	}
1980	} // namespace
1981
1982	Expr *CastExpr::getSubExprAsWritten() {
1983	const Expr *SubExpr = nullptr;
1984
1985	for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
1986	SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
1987
1988	// Conversions by constructor and conversion functions have a
1989	// subexpression describing the call; strip it off.
1990	if (E->getCastKind() == CK_ConstructorConversion) {
1991	SubExpr = IgnoreExprNodes(E: cast<CXXConstructExpr>(Val: SubExpr)->getArg(Arg: 0),
1992	Fns&: ignoreImplicitSemaNodes);
1993	} else if (E->getCastKind() == CK_UserDefinedConversion) {
1994	assert((isa<CallExpr, BlockExpr>(SubExpr)) &&
1995	"Unexpected SubExpr for CK_UserDefinedConversion.");
1996	if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
1997	SubExpr = MCE->getImplicitObjectArgument();
1998	}
1999	}
2000
2001	return const_cast<Expr *>(SubExpr);
2002	}
2003
2004	NamedDecl *CastExpr::getConversionFunction() const {
2005	const Expr *SubExpr = nullptr;
2006
2007	for (const CastExpr *E = this; E; E = dyn_cast<ImplicitCastExpr>(Val: SubExpr)) {
2008	SubExpr = IgnoreExprNodes(E: E->getSubExpr(), Fns&: ignoreImplicitSemaNodes);
2009
2010	if (E->getCastKind() == CK_ConstructorConversion)
2011	return cast<CXXConstructExpr>(Val: SubExpr)->getConstructor();
2012
2013	if (E->getCastKind() == CK_UserDefinedConversion) {
2014	if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: SubExpr))
2015	return MCE->getMethodDecl();
2016	}
2017	}
2018
2019	return nullptr;
2020	}
2021
2022	CXXBaseSpecifier **CastExpr::path_buffer() {
2023	switch (getStmtClass()) {
2024	#define ABSTRACT_STMT(x)
2025	#define CASTEXPR(Type, Base) \
2026	case Stmt::Type##Class: \
2027	return static_cast<Type *>(this)->getTrailingObjects<CXXBaseSpecifier *>();
2028	#define STMT(Type, Base)
2029	#include "clang/AST/StmtNodes.inc"
2030	default:
2031	llvm_unreachable("non-cast expressions not possible here");
2032	}
2033	}
2034
2035	const FieldDecl *CastExpr::getTargetFieldForToUnionCast(QualType unionType,
2036	QualType opType) {
2037	auto RD = unionType->castAs<RecordType>()->getDecl();
2038	return getTargetFieldForToUnionCast(RD, opType);
2039	}
2040
2041	const FieldDecl *CastExpr::getTargetFieldForToUnionCast(const RecordDecl *RD,
2042	QualType OpType) {
2043	auto &Ctx = RD->getASTContext();
2044	RecordDecl::field_iterator Field, FieldEnd;
2045	for (Field = RD->field_begin(), FieldEnd = RD->field_end();
2046	Field != FieldEnd; ++Field) {
2047	if (Ctx.hasSameUnqualifiedType(Field->getType(), OpType) &&
2048	!Field->isUnnamedBitField()) {
2049	return *Field;
2050	}
2051	}
2052	return nullptr;
2053	}
2054
2055	FPOptionsOverride *CastExpr::getTrailingFPFeatures() {
2056	assert(hasStoredFPFeatures());
2057	switch (getStmtClass()) {
2058	case ImplicitCastExprClass:
2059	return static_cast<ImplicitCastExpr *>(this)
2060	->getTrailingObjects<FPOptionsOverride>();
2061	case CStyleCastExprClass:
2062	return static_cast<CStyleCastExpr *>(this)
2063	->getTrailingObjects<FPOptionsOverride>();
2064	case CXXFunctionalCastExprClass:
2065	return static_cast<CXXFunctionalCastExpr *>(this)
2066	->getTrailingObjects<FPOptionsOverride>();
2067	case CXXStaticCastExprClass:
2068	return static_cast<CXXStaticCastExpr *>(this)
2069	->getTrailingObjects<FPOptionsOverride>();
2070	default:
2071	llvm_unreachable("Cast does not have FPFeatures");
2072	}
2073	}
2074
2075	ImplicitCastExpr *ImplicitCastExpr::Create(const ASTContext &C, QualType T,
2076	CastKind Kind, Expr *Operand,
2077	const CXXCastPath *BasePath,
2078	ExprValueKind VK,
2079	FPOptionsOverride FPO) {
2080	unsigned PathSize = (BasePath ? BasePath->size() : 0);
2081	void *Buffer =
2082	C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2083	Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2084	// Per C++ [conv.lval]p3, lvalue-to-rvalue conversions on class and
2085	// std::nullptr_t have special semantics not captured by CK_LValueToRValue.
2086	assert((Kind != CK_LValueToRValue ||
2087	!(T->isNullPtrType() || T->getAsCXXRecordDecl())) &&
2088	"invalid type for lvalue-to-rvalue conversion");
2089	ImplicitCastExpr *E =
2090	new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, FPO, VK);
2091	if (PathSize)
2092	llvm::uninitialized_copy(*BasePath,
2093	E->getTrailingObjects<CXXBaseSpecifier *>());
2094	return E;
2095	}
2096
2097	ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(const ASTContext &C,
2098	unsigned PathSize,
2099	bool HasFPFeatures) {
2100	void *Buffer =
2101	C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2102	Counts: PathSize, Counts: HasFPFeatures));
2103	return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2104	}
2105
2106	CStyleCastExpr *CStyleCastExpr::Create(const ASTContext &C, QualType T,
2107	ExprValueKind VK, CastKind K, Expr *Op,
2108	const CXXCastPath *BasePath,
2109	FPOptionsOverride FPO,
2110	TypeSourceInfo *WrittenTy,
2111	SourceLocation L, SourceLocation R) {
2112	unsigned PathSize = (BasePath ? BasePath->size() : 0);
2113	void *Buffer =
2114	C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2115	Counts: PathSize, Counts: FPO.requiresTrailingStorage()));
2116	CStyleCastExpr *E =
2117	new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, FPO, WrittenTy, L, R);
2118	if (PathSize)
2119	llvm::uninitialized_copy(*BasePath,
2120	E->getTrailingObjects<CXXBaseSpecifier *>());
2121	return E;
2122	}
2123
2124	CStyleCastExpr *CStyleCastExpr::CreateEmpty(const ASTContext &C,
2125	unsigned PathSize,
2126	bool HasFPFeatures) {
2127	void *Buffer =
2128	C.Allocate(Size: totalSizeToAlloc<CXXBaseSpecifier *, FPOptionsOverride>(
2129	Counts: PathSize, Counts: HasFPFeatures));
2130	return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize, HasFPFeatures);
2131	}
2132
2133	/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2134	/// corresponds to, e.g. "<<=".
2135	StringRef BinaryOperator::getOpcodeStr(Opcode Op) {
2136	switch (Op) {
2137	#define BINARY_OPERATION(Name, Spelling) case BO_##Name: return Spelling;
2138	#include "clang/AST/OperationKinds.def"
2139	}
2140	llvm_unreachable("Invalid OpCode!");
2141	}
2142
2143	BinaryOperatorKind
2144	BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) {
2145	switch (OO) {
2146	default: llvm_unreachable("Not an overloadable binary operator");
2147	case OO_Plus: return BO_Add;
2148	case OO_Minus: return BO_Sub;
2149	case OO_Star: return BO_Mul;
2150	case OO_Slash: return BO_Div;
2151	case OO_Percent: return BO_Rem;
2152	case OO_Caret: return BO_Xor;
2153	case OO_Amp: return BO_And;
2154	case OO_Pipe: return BO_Or;
2155	case OO_Equal: return BO_Assign;
2156	case OO_Spaceship: return BO_Cmp;
2157	case OO_Less: return BO_LT;
2158	case OO_Greater: return BO_GT;
2159	case OO_PlusEqual: return BO_AddAssign;
2160	case OO_MinusEqual: return BO_SubAssign;
2161	case OO_StarEqual: return BO_MulAssign;
2162	case OO_SlashEqual: return BO_DivAssign;
2163	case OO_PercentEqual: return BO_RemAssign;
2164	case OO_CaretEqual: return BO_XorAssign;
2165	case OO_AmpEqual: return BO_AndAssign;
2166	case OO_PipeEqual: return BO_OrAssign;
2167	case OO_LessLess: return BO_Shl;
2168	case OO_GreaterGreater: return BO_Shr;
2169	case OO_LessLessEqual: return BO_ShlAssign;
2170	case OO_GreaterGreaterEqual: return BO_ShrAssign;
2171	case OO_EqualEqual: return BO_EQ;
2172	case OO_ExclaimEqual: return BO_NE;
2173	case OO_LessEqual: return BO_LE;
2174	case OO_GreaterEqual: return BO_GE;
2175	case OO_AmpAmp: return BO_LAnd;
2176	case OO_PipePipe: return BO_LOr;
2177	case OO_Comma: return BO_Comma;
2178	case OO_ArrowStar: return BO_PtrMemI;
2179	}
2180	}
2181
2182	OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) {
2183	static const OverloadedOperatorKind OverOps[] = {
2184	/* .* Cannot be overloaded */OO_None, OO_ArrowStar,
2185	OO_Star, OO_Slash, OO_Percent,
2186	OO_Plus, OO_Minus,
2187	OO_LessLess, OO_GreaterGreater,
2188	OO_Spaceship,
2189	OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual,
2190	OO_EqualEqual, OO_ExclaimEqual,
2191	OO_Amp,
2192	OO_Caret,
2193	OO_Pipe,
2194	OO_AmpAmp,
2195	OO_PipePipe,
2196	OO_Equal, OO_StarEqual,
2197	OO_SlashEqual, OO_PercentEqual,
2198	OO_PlusEqual, OO_MinusEqual,
2199	OO_LessLessEqual, OO_GreaterGreaterEqual,
2200	OO_AmpEqual, OO_CaretEqual,
2201	OO_PipeEqual,
2202	OO_Comma
2203	};
2204	return OverOps[Opc];
2205	}
2206
2207	bool BinaryOperator::isNullPointerArithmeticExtension(ASTContext &Ctx,
2208	Opcode Opc,
2209	const Expr *LHS,
2210	const Expr *RHS) {
2211	if (Opc != BO_Add)
2212	return false;
2213
2214	// Check that we have one pointer and one integer operand.
2215	const Expr *PExp;
2216	if (LHS->getType()->isPointerType()) {
2217	if (!RHS->getType()->isIntegerType())
2218	return false;
2219	PExp = LHS;
2220	} else if (RHS->getType()->isPointerType()) {
2221	if (!LHS->getType()->isIntegerType())
2222	return false;
2223	PExp = RHS;
2224	} else {
2225	return false;
2226	}
2227
2228	// Workaround for old glibc's __PTR_ALIGN macro
2229	if (auto *Select =
2230	dyn_cast<ConditionalOperator>(Val: PExp->IgnoreParenNoopCasts(Ctx))) {
2231	// If the condition can be constant evaluated, we check the selected arm.
2232	bool EvalResult;
2233	if (!Select->getCond()->EvaluateAsBooleanCondition(Result&: EvalResult, Ctx))
2234	return false;
2235	PExp = EvalResult ? Select->getTrueExpr() : Select->getFalseExpr();
2236	}
2237
2238	// Check that the pointer is a nullptr.
2239	if (!PExp->IgnoreParenCasts()
2240	->isNullPointerConstant(Ctx, NPC: Expr::NPC_ValueDependentIsNotNull))
2241	return false;
2242
2243	// Check that the pointee type is char-sized.
2244	const PointerType *PTy = PExp->getType()->getAs<PointerType>();
2245	if (!PTy || !PTy->getPointeeType()->isCharType())
2246	return false;
2247
2248	return true;
2249	}
2250
2251	SourceLocExpr::SourceLocExpr(const ASTContext &Ctx, SourceLocIdentKind Kind,
2252	QualType ResultTy, SourceLocation BLoc,
2253	SourceLocation RParenLoc,
2254	DeclContext *ParentContext)
2255	: Expr(SourceLocExprClass, ResultTy, VK_PRValue, OK_Ordinary),
2256	BuiltinLoc(BLoc), RParenLoc(RParenLoc), ParentContext(ParentContext) {
2257	SourceLocExprBits.Kind = llvm::to_underlying(E: Kind);
2258	// In dependent contexts, function names may change.
2259	setDependence(MayBeDependent(Kind) && ParentContext->isDependentContext()
2260	? ExprDependence::Value
2261	: ExprDependence::None);
2262	}
2263
2264	StringRef SourceLocExpr::getBuiltinStr() const {
2265	switch (getIdentKind()) {
2266	case SourceLocIdentKind::File:
2267	return "__builtin_FILE";
2268	case SourceLocIdentKind::FileName:
2269	return "__builtin_FILE_NAME";
2270	case SourceLocIdentKind::Function:
2271	return "__builtin_FUNCTION";
2272	case SourceLocIdentKind::FuncSig:
2273	return "__builtin_FUNCSIG";
2274	case SourceLocIdentKind::Line:
2275	return "__builtin_LINE";
2276	case SourceLocIdentKind::Column:
2277	return "__builtin_COLUMN";
2278	case SourceLocIdentKind::SourceLocStruct:
2279	return "__builtin_source_location";
2280	}
2281	llvm_unreachable("unexpected IdentKind!");
2282	}
2283
2284	APValue SourceLocExpr::EvaluateInContext(const ASTContext &Ctx,
2285	const Expr *DefaultExpr) const {
2286	SourceLocation Loc;
2287	const DeclContext *Context;
2288
2289	if (const auto *DIE = dyn_cast_if_present<CXXDefaultInitExpr>(Val: DefaultExpr)) {
2290	Loc = DIE->getUsedLocation();
2291	Context = DIE->getUsedContext();
2292	} else if (const auto *DAE =
2293	dyn_cast_if_present<CXXDefaultArgExpr>(Val: DefaultExpr)) {
2294	Loc = DAE->getUsedLocation();
2295	Context = DAE->getUsedContext();
2296	} else {
2297	Loc = getLocation();
2298	Context = getParentContext();
2299	}
2300
2301	// If we are currently parsing a lambda declarator, we might not have a fully
2302	// formed call operator declaration yet, and we could not form a function name
2303	// for it. Because we do not have access to Sema/function scopes here, we
2304	// detect this case by relying on the fact such method doesn't yet have a
2305	// type.
2306	if (const auto *D = dyn_cast<CXXMethodDecl>(Val: Context);
2307	D && D->getFunctionTypeLoc().isNull() && isLambdaCallOperator(MD: D))
2308	Context = D->getParent()->getParent();
2309
2310	PresumedLoc PLoc = Ctx.getSourceManager().getPresumedLoc(
2311	Loc: Ctx.getSourceManager().getExpansionRange(Loc).getEnd());
2312
2313	auto MakeStringLiteral = [&](StringRef Tmp) {
2314	using LValuePathEntry = APValue::LValuePathEntry;
2315	StringLiteral *Res = Ctx.getPredefinedStringLiteralFromCache(Key: Tmp);
2316	// Decay the string to a pointer to the first character.
2317	LValuePathEntry Path[1] = {LValuePathEntry::ArrayIndex(Index: 0)};
2318	return APValue(Res, CharUnits::Zero(), Path, /*OnePastTheEnd=*/false);
2319	};
2320
2321	switch (getIdentKind()) {
2322	case SourceLocIdentKind::FileName: {
2323	// __builtin_FILE_NAME() is a Clang-specific extension that expands to the
2324	// the last part of __builtin_FILE().
2325	SmallString<256> FileName;
2326	clang::Preprocessor::processPathToFileName(
2327	FileName, PLoc, LangOpts: Ctx.getLangOpts(), TI: Ctx.getTargetInfo());
2328	return MakeStringLiteral(FileName);
2329	}
2330	case SourceLocIdentKind::File: {
2331	SmallString<256> Path(PLoc.getFilename());
2332	clang::Preprocessor::processPathForFileMacro(Path, LangOpts: Ctx.getLangOpts(),
2333	TI: Ctx.getTargetInfo());
2334	return MakeStringLiteral(Path);
2335	}
2336	case SourceLocIdentKind::Function:
2337	case SourceLocIdentKind::FuncSig: {
2338	const auto *CurDecl = dyn_cast<Decl>(Val: Context);
2339	const auto Kind = getIdentKind() == SourceLocIdentKind::Function
2340	? PredefinedIdentKind::Function
2341	: PredefinedIdentKind::FuncSig;
2342	return MakeStringLiteral(
2343	CurDecl ? PredefinedExpr::ComputeName(IK: Kind, CurrentDecl: CurDecl) : std::string(""));
2344	}
2345	case SourceLocIdentKind::Line:
2346	return APValue(Ctx.MakeIntValue(Value: PLoc.getLine(), Type: Ctx.UnsignedIntTy));
2347	case SourceLocIdentKind::Column:
2348	return APValue(Ctx.MakeIntValue(Value: PLoc.getColumn(), Type: Ctx.UnsignedIntTy));
2349	case SourceLocIdentKind::SourceLocStruct: {
2350	// Fill in a std::source_location::__impl structure, by creating an
2351	// artificial file-scoped CompoundLiteralExpr, and returning a pointer to
2352	// that.
2353	const CXXRecordDecl *ImplDecl = getType()->getPointeeCXXRecordDecl();
2354	assert(ImplDecl);
2355
2356	// Construct an APValue for the __impl struct, and get or create a Decl
2357	// corresponding to that. Note that we've already verified that the shape of
2358	// the ImplDecl type is as expected.
2359
2360	APValue Value(APValue::UninitStruct(), 0, 4);
2361	for (const FieldDecl *F : ImplDecl->fields()) {
2362	StringRef Name = F->getName();
2363	if (Name == "_M_file_name") {
2364	SmallString<256> Path(PLoc.getFilename());
2365	clang::Preprocessor::processPathForFileMacro(Path, Ctx.getLangOpts(),
2366	Ctx.getTargetInfo());
2367	Value.getStructField(F->getFieldIndex()) = MakeStringLiteral(Path);
2368	} else if (Name == "_M_function_name") {
2369	// Note: this emits the PrettyFunction name -- different than what
2370	// __builtin_FUNCTION() above returns!
2371	const auto *CurDecl = dyn_cast<Decl>(Context);
2372	Value.getStructField(F->getFieldIndex()) = MakeStringLiteral(
2373	CurDecl && !isa<TranslationUnitDecl>(CurDecl)
2374	? StringRef(PredefinedExpr::ComputeName(
2375	PredefinedIdentKind::PrettyFunction, CurDecl))
2376	: "");
2377	} else if (Name == "_M_line") {
2378	llvm::APSInt IntVal = Ctx.MakeIntValue(PLoc.getLine(), F->getType());
2379	Value.getStructField(F->getFieldIndex()) = APValue(IntVal);
2380	} else if (Name == "_M_column") {
2381	llvm::APSInt IntVal = Ctx.MakeIntValue(PLoc.getColumn(), F->getType());
2382	Value.getStructField(F->getFieldIndex()) = APValue(IntVal);
2383	}
2384	}
2385
2386	UnnamedGlobalConstantDecl *GV =
2387	Ctx.getUnnamedGlobalConstantDecl(getType()->getPointeeType(), Value);
2388
2389	return APValue(GV, CharUnits::Zero(), ArrayRef<APValue::LValuePathEntry>{},
2390	false);
2391	}
2392	}
2393	llvm_unreachable("unhandled case");
2394	}
2395
2396	EmbedExpr::EmbedExpr(const ASTContext &Ctx, SourceLocation Loc,
2397	EmbedDataStorage *Data, unsigned Begin,
2398	unsigned NumOfElements)
2399	: Expr(EmbedExprClass, Ctx.IntTy, VK_PRValue, OK_Ordinary),
2400	EmbedKeywordLoc(Loc), Ctx(&Ctx), Data(Data), Begin(Begin),
2401	NumOfElements(NumOfElements) {
2402	setDependence(ExprDependence::None);
2403	FakeChildNode = IntegerLiteral::Create(
2404	Ctx, llvm::APInt::getZero(numBits: Ctx.getTypeSize(getType())), getType(), Loc);
2405	}
2406
2407	InitListExpr::InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
2408	ArrayRef<Expr *> initExprs, SourceLocation rbraceloc)
2409	: Expr(InitListExprClass, QualType(), VK_PRValue, OK_Ordinary),
2410	InitExprs(C, initExprs.size()), LBraceLoc(lbraceloc),
2411	RBraceLoc(rbraceloc), AltForm(nullptr, true) {
2412	sawArrayRangeDesignator(ARD: false);
2413	InitExprs.insert(C, I: InitExprs.end(), From: initExprs.begin(), To: initExprs.end());
2414
2415	setDependence(computeDependence(E: this));
2416	}
2417
2418	void InitListExpr::reserveInits(const ASTContext &C, unsigned NumInits) {
2419	if (NumInits > InitExprs.size())
2420	InitExprs.reserve(C, N: NumInits);
2421	}
2422
2423	void InitListExpr::resizeInits(const ASTContext &C, unsigned NumInits) {
2424	InitExprs.resize(C, N: NumInits, NV: nullptr);
2425	}
2426
2427	Expr *InitListExpr::updateInit(const ASTContext &C, unsigned Init, Expr *expr) {
2428	if (Init >= InitExprs.size()) {
2429	InitExprs.insert(C, I: InitExprs.end(), NumToInsert: Init - InitExprs.size() + 1, Elt: nullptr);
2430	setInit(Init, expr);
2431	return nullptr;
2432	}
2433
2434	Expr *Result = cast_or_null<Expr>(Val: InitExprs[Init]);
2435	setInit(Init, expr);
2436	return Result;
2437	}
2438
2439	void InitListExpr::setArrayFiller(Expr *filler) {
2440	assert(!hasArrayFiller() && "Filler already set!");
2441	ArrayFillerOrUnionFieldInit = filler;
2442	// Fill out any "holes" in the array due to designated initializers.
2443	Expr **inits = getInits();
2444	for (unsigned i = 0, e = getNumInits(); i != e; ++i)
2445	if (inits[i] == nullptr)
2446	inits[i] = filler;
2447	}
2448
2449	bool InitListExpr::isStringLiteralInit() const {
2450	if (getNumInits() != 1)
2451	return false;
2452	const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
2453	if (!AT || !AT->getElementType()->isIntegerType())
2454	return false;
2455	// It is possible for getInit() to return null.
2456	const Expr *Init = getInit(Init: 0);
2457	if (!Init)
2458	return false;
2459	Init = Init->IgnoreParenImpCasts();
2460	return isa<StringLiteral>(Val: Init) || isa<ObjCEncodeExpr>(Val: Init);
2461	}
2462
2463	bool InitListExpr::isTransparent() const {
2464	assert(isSemanticForm() && "syntactic form never semantically transparent");
2465
2466	// A glvalue InitListExpr is always just sugar.
2467	if (isGLValue()) {
2468	assert(getNumInits() == 1 && "multiple inits in glvalue init list");
2469	return true;
2470	}
2471
2472	// Otherwise, we're sugar if and only if we have exactly one initializer that
2473	// is of the same type.
2474	if (getNumInits() != 1 || !getInit(Init: 0))
2475	return false;
2476
2477	// Don't confuse aggregate initialization of a struct X { X &x; }; with a
2478	// transparent struct copy.
2479	if (!getInit(Init: 0)->isPRValue() && getType()->isRecordType())
2480	return false;
2481
2482	return getType().getCanonicalType() ==
2483	getInit(Init: 0)->getType().getCanonicalType();
2484	}
2485
2486	bool InitListExpr::isIdiomaticZeroInitializer(const LangOptions &LangOpts) const {
2487	assert(isSyntacticForm() && "only test syntactic form as zero initializer");
2488
2489	if (LangOpts.CPlusPlus || getNumInits() != 1 || !getInit(Init: 0)) {
2490	return false;
2491	}
2492
2493	const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: getInit(Init: 0)->IgnoreImplicit());
2494	return Lit && Lit->getValue() == 0;
2495	}
2496
2497	SourceLocation InitListExpr::getBeginLoc() const {
2498	if (InitListExpr *SyntacticForm = getSyntacticForm())
2499	return SyntacticForm->getBeginLoc();
2500	SourceLocation Beg = LBraceLoc;
2501	if (Beg.isInvalid()) {
2502	// Find the first non-null initializer.
2503	for (InitExprsTy::const_iterator I = InitExprs.begin(),
2504	E = InitExprs.end();
2505	I != E; ++I) {
2506	if (Stmt *S = *I) {
2507	Beg = S->getBeginLoc();
2508	break;
2509	}
2510	}
2511	}
2512	return Beg;
2513	}
2514
2515	SourceLocation InitListExpr::getEndLoc() const {
2516	if (InitListExpr *SyntacticForm = getSyntacticForm())
2517	return SyntacticForm->getEndLoc();
2518	SourceLocation End = RBraceLoc;
2519	if (End.isInvalid()) {
2520	// Find the first non-null initializer from the end.
2521	for (Stmt *S : llvm::reverse(C: InitExprs)) {
2522	if (S) {
2523	End = S->getEndLoc();
2524	break;
2525	}
2526	}
2527	}
2528	return End;
2529	}
2530
2531	/// getFunctionType - Return the underlying function type for this block.
2532	///
2533	const FunctionProtoType *BlockExpr::getFunctionType() const {
2534	// The block pointer is never sugared, but the function type might be.
2535	return cast<BlockPointerType>(getType())
2536	->getPointeeType()->castAs<FunctionProtoType>();
2537	}
2538
2539	SourceLocation BlockExpr::getCaretLocation() const {
2540	return TheBlock->getCaretLocation();
2541	}
2542	const Stmt *BlockExpr::getBody() const {
2543	return TheBlock->getBody();
2544	}
2545	Stmt *BlockExpr::getBody() {
2546	return TheBlock->getBody();
2547	}
2548
2549
2550	//===----------------------------------------------------------------------===//
2551	// Generic Expression Routines
2552	//===----------------------------------------------------------------------===//
2553
2554	bool Expr::isReadIfDiscardedInCPlusPlus11() const {
2555	// In C++11, discarded-value expressions of a certain form are special,
2556	// according to [expr]p10:
2557	// The lvalue-to-rvalue conversion (4.1) is applied only if the
2558	// expression is a glvalue of volatile-qualified type and it has
2559	// one of the following forms:
2560	if (!isGLValue() || !getType().isVolatileQualified())
2561	return false;
2562
2563	const Expr *E = IgnoreParens();
2564
2565	// - id-expression (5.1.1),
2566	if (isa<DeclRefExpr>(Val: E))
2567	return true;
2568
2569	// - subscripting (5.2.1),
2570	if (isa<ArraySubscriptExpr>(Val: E))
2571	return true;
2572
2573	// - class member access (5.2.5),
2574	if (isa<MemberExpr>(Val: E))
2575	return true;
2576
2577	// - indirection (5.3.1),
2578	if (auto *UO = dyn_cast<UnaryOperator>(Val: E))
2579	if (UO->getOpcode() == UO_Deref)
2580	return true;
2581
2582	if (auto *BO = dyn_cast<BinaryOperator>(Val: E)) {
2583	// - pointer-to-member operation (5.5),
2584	if (BO->isPtrMemOp())
2585	return true;
2586
2587	// - comma expression (5.18) where the right operand is one of the above.
2588	if (BO->getOpcode() == BO_Comma)
2589	return BO->getRHS()->isReadIfDiscardedInCPlusPlus11();
2590	}
2591
2592	// - conditional expression (5.16) where both the second and the third
2593	// operands are one of the above, or
2594	if (auto *CO = dyn_cast<ConditionalOperator>(Val: E))
2595	return CO->getTrueExpr()->isReadIfDiscardedInCPlusPlus11() &&
2596	CO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2597	// The related edge case of "*x ?: *x".
2598	if (auto *BCO =
2599	dyn_cast<BinaryConditionalOperator>(Val: E)) {
2600	if (auto *OVE = dyn_cast<OpaqueValueExpr>(Val: BCO->getTrueExpr()))
2601	return OVE->getSourceExpr()->isReadIfDiscardedInCPlusPlus11() &&
2602	BCO->getFalseExpr()->isReadIfDiscardedInCPlusPlus11();
2603	}
2604
2605	// Objective-C++ extensions to the rule.
2606	if (isa<ObjCIvarRefExpr>(Val: E))
2607	return true;
2608	if (const auto *POE = dyn_cast<PseudoObjectExpr>(Val: E)) {
2609	if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(Val: POE->getSyntacticForm()))
2610	return true;
2611	}
2612
2613	return false;
2614	}
2615
2616	/// isUnusedResultAWarning - Return true if this immediate expression should
2617	/// be warned about if the result is unused. If so, fill in Loc and Ranges
2618	/// with location to warn on and the source range[s] to report with the
2619	/// warning.
2620	bool Expr::isUnusedResultAWarning(const Expr *&WarnE, SourceLocation &Loc,
2621	SourceRange &R1, SourceRange &R2,
2622	ASTContext &Ctx) const {
2623	// Don't warn if the expr is type dependent. The type could end up
2624	// instantiating to void.
2625	if (isTypeDependent())
2626	return false;
2627
2628	switch (getStmtClass()) {
2629	default:
2630	if (getType()->isVoidType())
2631	return false;
2632	WarnE = this;
2633	Loc = getExprLoc();
2634	R1 = getSourceRange();
2635	return true;
2636	case ParenExprClass:
2637	return cast<ParenExpr>(Val: this)->getSubExpr()->
2638	isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2639	case GenericSelectionExprClass:
2640	return cast<GenericSelectionExpr>(Val: this)->getResultExpr()->
2641	isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2642	case CoawaitExprClass:
2643	case CoyieldExprClass:
2644	return cast<CoroutineSuspendExpr>(Val: this)->getResumeExpr()->
2645	isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2646	case ChooseExprClass:
2647	return cast<ChooseExpr>(Val: this)->getChosenSubExpr()->
2648	isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2649	case UnaryOperatorClass: {
2650	const UnaryOperator *UO = cast<UnaryOperator>(Val: this);
2651
2652	switch (UO->getOpcode()) {
2653	case UO_Plus:
2654	case UO_Minus:
2655	case UO_AddrOf:
2656	case UO_Not:
2657	case UO_LNot:
2658	case UO_Deref:
2659	break;
2660	case UO_Coawait:
2661	// This is just the 'operator co_await' call inside the guts of a
2662	// dependent co_await call.
2663	case UO_PostInc:
2664	case UO_PostDec:
2665	case UO_PreInc:
2666	case UO_PreDec: // ++/--
2667	return false; // Not a warning.
2668	case UO_Real:
2669	case UO_Imag:
2670	// accessing a piece of a volatile complex is a side-effect.
2671	if (Ctx.getCanonicalType(T: UO->getSubExpr()->getType())
2672	.isVolatileQualified())
2673	return false;
2674	break;
2675	case UO_Extension:
2676	return UO->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2677	}
2678	WarnE = this;
2679	Loc = UO->getOperatorLoc();
2680	R1 = UO->getSubExpr()->getSourceRange();
2681	return true;
2682	}
2683	case BinaryOperatorClass: {
2684	const BinaryOperator *BO = cast<BinaryOperator>(Val: this);
2685	switch (BO->getOpcode()) {
2686	default:
2687	break;
2688	// Consider the RHS of comma for side effects. LHS was checked by
2689	// Sema::CheckCommaOperands.
2690	case BO_Comma:
2691	// ((foo = <blah>), 0) is an idiom for hiding the result (and
2692	// lvalue-ness) of an assignment written in a macro.
2693	if (IntegerLiteral *IE =
2694	dyn_cast<IntegerLiteral>(Val: BO->getRHS()->IgnoreParens()))
2695	if (IE->getValue() == 0)
2696	return false;
2697	return BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2698	// Consider '||', '&&' to have side effects if the LHS or RHS does.
2699	case BO_LAnd:
2700	case BO_LOr:
2701	if (!BO->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) ||
2702	!BO->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx))
2703	return false;
2704	break;
2705	}
2706	if (BO->isAssignmentOp())
2707	return false;
2708	WarnE = this;
2709	Loc = BO->getOperatorLoc();
2710	R1 = BO->getLHS()->getSourceRange();
2711	R2 = BO->getRHS()->getSourceRange();
2712	return true;
2713	}
2714	case CompoundAssignOperatorClass:
2715	case VAArgExprClass:
2716	case AtomicExprClass:
2717	return false;
2718
2719	case ConditionalOperatorClass: {
2720	// If only one of the LHS or RHS is a warning, the operator might
2721	// be being used for control flow. Only warn if both the LHS and
2722	// RHS are warnings.
2723	const auto *Exp = cast<ConditionalOperator>(Val: this);
2724	return Exp->getLHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx) &&
2725	Exp->getRHS()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2726	}
2727	case BinaryConditionalOperatorClass: {
2728	const auto *Exp = cast<BinaryConditionalOperator>(Val: this);
2729	return Exp->getFalseExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2730	}
2731
2732	case MemberExprClass:
2733	WarnE = this;
2734	Loc = cast<MemberExpr>(Val: this)->getMemberLoc();
2735	R1 = SourceRange(Loc, Loc);
2736	R2 = cast<MemberExpr>(Val: this)->getBase()->getSourceRange();
2737	return true;
2738
2739	case ArraySubscriptExprClass:
2740	WarnE = this;
2741	Loc = cast<ArraySubscriptExpr>(Val: this)->getRBracketLoc();
2742	R1 = cast<ArraySubscriptExpr>(Val: this)->getLHS()->getSourceRange();
2743	R2 = cast<ArraySubscriptExpr>(Val: this)->getRHS()->getSourceRange();
2744	return true;
2745
2746	case CXXOperatorCallExprClass: {
2747	// Warn about operator ==,!=,<,>,<=, and >= even when user-defined operator
2748	// overloads as there is no reasonable way to define these such that they
2749	// have non-trivial, desirable side-effects. See the -Wunused-comparison
2750	// warning: operators == and != are commonly typo'ed, and so warning on them
2751	// provides additional value as well. If this list is updated,
2752	// DiagnoseUnusedComparison should be as well.
2753	const CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(Val: this);
2754	switch (Op->getOperator()) {
2755	default:
2756	break;
2757	case OO_EqualEqual:
2758	case OO_ExclaimEqual:
2759	case OO_Less:
2760	case OO_Greater:
2761	case OO_GreaterEqual:
2762	case OO_LessEqual:
2763	if (Op->getCallReturnType(Ctx)->isReferenceType() ||
2764	Op->getCallReturnType(Ctx)->isVoidType())
2765	break;
2766	WarnE = this;
2767	Loc = Op->getOperatorLoc();
2768	R1 = Op->getSourceRange();
2769	return true;
2770	}
2771
2772	// Fallthrough for generic call handling.
2773	[[fallthrough]];
2774	}
2775	case CallExprClass:
2776	case CXXMemberCallExprClass:
2777	case UserDefinedLiteralClass: {
2778	// If this is a direct call, get the callee.
2779	const CallExpr *CE = cast<CallExpr>(Val: this);
2780	if (const Decl *FD = CE->getCalleeDecl()) {
2781	// If the callee has attribute pure, const, or warn_unused_result, warn
2782	// about it. void foo() { strlen("bar"); } should warn.
2783	//
2784	// Note: If new cases are added here, DiagnoseUnusedExprResult should be
2785	// updated to match for QoI.
2786	if (CE->hasUnusedResultAttr(Ctx) ||
2787	FD->hasAttr<PureAttr>() || FD->hasAttr<ConstAttr>()) {
2788	WarnE = this;
2789	Loc = CE->getCallee()->getBeginLoc();
2790	R1 = CE->getCallee()->getSourceRange();
2791
2792	if (unsigned NumArgs = CE->getNumArgs())
2793	R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2794	CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2795	return true;
2796	}
2797	}
2798	return false;
2799	}
2800
2801	// If we don't know precisely what we're looking at, let's not warn.
2802	case UnresolvedLookupExprClass:
2803	case CXXUnresolvedConstructExprClass:
2804	case RecoveryExprClass:
2805	return false;
2806
2807	case CXXTemporaryObjectExprClass:
2808	case CXXConstructExprClass: {
2809	if (const CXXRecordDecl *Type = getType()->getAsCXXRecordDecl()) {
2810	const auto *WarnURAttr = Type->getAttr<WarnUnusedResultAttr>();
2811	if (Type->hasAttr<WarnUnusedAttr>() ||
2812	(WarnURAttr && WarnURAttr->IsCXX11NoDiscard())) {
2813	WarnE = this;
2814	Loc = getBeginLoc();
2815	R1 = getSourceRange();
2816	return true;
2817	}
2818	}
2819
2820	const auto *CE = cast<CXXConstructExpr>(Val: this);
2821	if (const CXXConstructorDecl *Ctor = CE->getConstructor()) {
2822	const auto *WarnURAttr = Ctor->getAttr<WarnUnusedResultAttr>();
2823	if (WarnURAttr && WarnURAttr->IsCXX11NoDiscard()) {
2824	WarnE = this;
2825	Loc = getBeginLoc();
2826	R1 = getSourceRange();
2827
2828	if (unsigned NumArgs = CE->getNumArgs())
2829	R2 = SourceRange(CE->getArg(Arg: 0)->getBeginLoc(),
2830	CE->getArg(Arg: NumArgs - 1)->getEndLoc());
2831	return true;
2832	}
2833	}
2834
2835	return false;
2836	}
2837
2838	case ObjCMessageExprClass: {
2839	const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(Val: this);
2840	if (Ctx.getLangOpts().ObjCAutoRefCount &&
2841	ME->isInstanceMessage() &&
2842	!ME->getType()->isVoidType() &&
2843	ME->getMethodFamily() == OMF_init) {
2844	WarnE = this;
2845	Loc = getExprLoc();
2846	R1 = ME->getSourceRange();
2847	return true;
2848	}
2849
2850	if (const ObjCMethodDecl *MD = ME->getMethodDecl())
2851	if (MD->hasAttr<WarnUnusedResultAttr>()) {
2852	WarnE = this;
2853	Loc = getExprLoc();
2854	return true;
2855	}
2856
2857	return false;
2858	}
2859
2860	case ObjCPropertyRefExprClass:
2861	case ObjCSubscriptRefExprClass:
2862	WarnE = this;
2863	Loc = getExprLoc();
2864	R1 = getSourceRange();
2865	return true;
2866
2867	case PseudoObjectExprClass: {
2868	const auto *POE = cast<PseudoObjectExpr>(Val: this);
2869
2870	// For some syntactic forms, we should always warn.
2871	if (isa<ObjCPropertyRefExpr, ObjCSubscriptRefExpr>(
2872	Val: POE->getSyntacticForm())) {
2873	WarnE = this;
2874	Loc = getExprLoc();
2875	R1 = getSourceRange();
2876	return true;
2877	}
2878
2879	// For others, we should never warn.
2880	if (auto *BO = dyn_cast<BinaryOperator>(Val: POE->getSyntacticForm()))
2881	if (BO->isAssignmentOp())
2882	return false;
2883	if (auto *UO = dyn_cast<UnaryOperator>(Val: POE->getSyntacticForm()))
2884	if (UO->isIncrementDecrementOp())
2885	return false;
2886
2887	// Otherwise, warn if the result expression would warn.
2888	const Expr *Result = POE->getResultExpr();
2889	return Result && Result->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2890	}
2891
2892	case StmtExprClass: {
2893	// Statement exprs don't logically have side effects themselves, but are
2894	// sometimes used in macros in ways that give them a type that is unused.
2895	// For example ({ blah; foo(); }) will end up with a type if foo has a type.
2896	// however, if the result of the stmt expr is dead, we don't want to emit a
2897	// warning.
2898	const CompoundStmt *CS = cast<StmtExpr>(Val: this)->getSubStmt();
2899	if (!CS->body_empty()) {
2900	if (const Expr *E = dyn_cast<Expr>(Val: CS->body_back()))
2901	return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2902	if (const LabelStmt *Label = dyn_cast<LabelStmt>(Val: CS->body_back()))
2903	if (const Expr *E = dyn_cast<Expr>(Val: Label->getSubStmt()))
2904	return E->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2905	}
2906
2907	if (getType()->isVoidType())
2908	return false;
2909	WarnE = this;
2910	Loc = cast<StmtExpr>(Val: this)->getLParenLoc();
2911	R1 = getSourceRange();
2912	return true;
2913	}
2914	case CXXFunctionalCastExprClass:
2915	case CStyleCastExprClass: {
2916	// Ignore an explicit cast to void, except in C++98 if the operand is a
2917	// volatile glvalue for which we would trigger an implicit read in any
2918	// other language mode. (Such an implicit read always happens as part of
2919	// the lvalue conversion in C, and happens in C++ for expressions of all
2920	// forms where it seems likely the user intended to trigger a volatile
2921	// load.)
2922	const CastExpr *CE = cast<CastExpr>(Val: this);
2923	const Expr *SubE = CE->getSubExpr()->IgnoreParens();
2924	if (CE->getCastKind() == CK_ToVoid) {
2925	if (Ctx.getLangOpts().CPlusPlus && !Ctx.getLangOpts().CPlusPlus11 &&
2926	SubE->isReadIfDiscardedInCPlusPlus11()) {
2927	// Suppress the "unused value" warning for idiomatic usage of
2928	// '(void)var;' used to suppress "unused variable" warnings.
2929	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: SubE))
2930	if (auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
2931	if (!VD->isExternallyVisible())
2932	return false;
2933
2934	// The lvalue-to-rvalue conversion would have no effect for an array.
2935	// It's implausible that the programmer expected this to result in a
2936	// volatile array load, so don't warn.
2937	if (SubE->getType()->isArrayType())
2938	return false;
2939
2940	return SubE->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2941	}
2942	return false;
2943	}
2944
2945	// If this is a cast to a constructor conversion, check the operand.
2946	// Otherwise, the result of the cast is unused.
2947	if (CE->getCastKind() == CK_ConstructorConversion)
2948	return CE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2949	if (CE->getCastKind() == CK_Dependent)
2950	return false;
2951
2952	WarnE = this;
2953	if (const CXXFunctionalCastExpr *CXXCE =
2954	dyn_cast<CXXFunctionalCastExpr>(Val: this)) {
2955	Loc = CXXCE->getBeginLoc();
2956	R1 = CXXCE->getSubExpr()->getSourceRange();
2957	} else {
2958	const CStyleCastExpr *CStyleCE = cast<CStyleCastExpr>(Val: this);
2959	Loc = CStyleCE->getLParenLoc();
2960	R1 = CStyleCE->getSubExpr()->getSourceRange();
2961	}
2962	return true;
2963	}
2964	case ImplicitCastExprClass: {
2965	const CastExpr *ICE = cast<ImplicitCastExpr>(Val: this);
2966
2967	// lvalue-to-rvalue conversion on a volatile lvalue is a side-effect.
2968	if (ICE->getCastKind() == CK_LValueToRValue &&
2969	ICE->getSubExpr()->getType().isVolatileQualified())
2970	return false;
2971
2972	return ICE->getSubExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2973	}
2974	case CXXDefaultArgExprClass:
2975	return (cast<CXXDefaultArgExpr>(Val: this)
2976	->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2977	case CXXDefaultInitExprClass:
2978	return (cast<CXXDefaultInitExpr>(Val: this)
2979	->getExpr()->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx));
2980
2981	case CXXNewExprClass:
2982	// FIXME: In theory, there might be new expressions that don't have side
2983	// effects (e.g. a placement new with an uninitialized POD).
2984	case CXXDeleteExprClass:
2985	return false;
2986	case MaterializeTemporaryExprClass:
2987	return cast<MaterializeTemporaryExpr>(Val: this)
2988	->getSubExpr()
2989	->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2990	case CXXBindTemporaryExprClass:
2991	return cast<CXXBindTemporaryExpr>(Val: this)->getSubExpr()
2992	->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2993	case ExprWithCleanupsClass:
2994	return cast<ExprWithCleanups>(Val: this)->getSubExpr()
2995	->isUnusedResultAWarning(WarnE, Loc, R1, R2, Ctx);
2996	case OpaqueValueExprClass:
2997	return cast<OpaqueValueExpr>(Val: this)->getSourceExpr()->isUnusedResultAWarning(
2998	WarnE, Loc, R1, R2, Ctx);
2999	}
3000	}
3001
3002	/// isOBJCGCCandidate - Check if an expression is objc gc'able.
3003	/// returns true, if it is; false otherwise.
3004	bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const {
3005	const Expr *E = IgnoreParens();
3006	switch (E->getStmtClass()) {
3007	default:
3008	return false;
3009	case ObjCIvarRefExprClass:
3010	return true;
3011	case Expr::UnaryOperatorClass:
3012	return cast<UnaryOperator>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3013	case ImplicitCastExprClass:
3014	return cast<ImplicitCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3015	case MaterializeTemporaryExprClass:
3016	return cast<MaterializeTemporaryExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(
3017	Ctx);
3018	case CStyleCastExprClass:
3019	return cast<CStyleCastExpr>(Val: E)->getSubExpr()->isOBJCGCCandidate(Ctx);
3020	case DeclRefExprClass: {
3021	const Decl *D = cast<DeclRefExpr>(Val: E)->getDecl();
3022
3023	if (const VarDecl *VD = dyn_cast<VarDecl>(Val: D)) {
3024	if (VD->hasGlobalStorage())
3025	return true;
3026	QualType T = VD->getType();
3027	// dereferencing to a pointer is always a gc'able candidate,
3028	// unless it is __weak.
3029	return T->isPointerType() &&
3030	(Ctx.getObjCGCAttrKind(Ty: T) != Qualifiers::Weak);
3031	}
3032	return false;
3033	}
3034	case MemberExprClass: {
3035	const MemberExpr *M = cast<MemberExpr>(Val: E);
3036	return M->getBase()->isOBJCGCCandidate(Ctx);
3037	}
3038	case ArraySubscriptExprClass:
3039	return cast<ArraySubscriptExpr>(Val: E)->getBase()->isOBJCGCCandidate(Ctx);
3040	}
3041	}
3042
3043	bool Expr::isBoundMemberFunction(ASTContext &Ctx) const {
3044	if (isTypeDependent())
3045	return false;
3046	return ClassifyLValue(Ctx) == Expr::LV_MemberFunction;
3047	}
3048
3049	QualType Expr::findBoundMemberType(const Expr *expr) {
3050	assert(expr->hasPlaceholderType(BuiltinType::BoundMember));
3051
3052	// Bound member expressions are always one of these possibilities:
3053	// x->m x.m x->*y x.*y
3054	// (possibly parenthesized)
3055
3056	expr = expr->IgnoreParens();
3057	if (const MemberExpr *mem = dyn_cast<MemberExpr>(Val: expr)) {
3058	assert(isa<CXXMethodDecl>(mem->getMemberDecl()));
3059	return mem->getMemberDecl()->getType();
3060	}
3061
3062	if (const BinaryOperator *op = dyn_cast<BinaryOperator>(Val: expr)) {
3063	QualType type = op->getRHS()->getType()->castAs<MemberPointerType>()
3064	->getPointeeType();
3065	assert(type->isFunctionType());
3066	return type;
3067	}
3068
3069	assert(isa<UnresolvedMemberExpr>(expr) || isa<CXXPseudoDestructorExpr>(expr));
3070	return QualType();
3071	}
3072
3073	Expr *Expr::IgnoreImpCasts() {
3074	return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitCastsSingleStep);
3075	}
3076
3077	Expr *Expr::IgnoreCasts() {
3078	return IgnoreExprNodes(E: this, Fns&: IgnoreCastsSingleStep);
3079	}
3080
3081	Expr *Expr::IgnoreImplicit() {
3082	return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitSingleStep);
3083	}
3084
3085	Expr *Expr::IgnoreImplicitAsWritten() {
3086	return IgnoreExprNodes(E: this, Fns&: IgnoreImplicitAsWrittenSingleStep);
3087	}
3088
3089	Expr *Expr::IgnoreParens() {
3090	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep);
3091	}
3092
3093	Expr *Expr::IgnoreParenImpCasts() {
3094	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3095	Fns&: IgnoreImplicitCastsExtraSingleStep);
3096	}
3097
3098	Expr *Expr::IgnoreParenCasts() {
3099	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep, Fns&: IgnoreCastsSingleStep);
3100	}
3101
3102	Expr *Expr::IgnoreConversionOperatorSingleStep() {
3103	if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Val: this)) {
3104	if (isa_and_nonnull<CXXConversionDecl>(Val: MCE->getMethodDecl()))
3105	return MCE->getImplicitObjectArgument();
3106	}
3107	return this;
3108	}
3109
3110	Expr *Expr::IgnoreParenLValueCasts() {
3111	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3112	Fns&: IgnoreLValueCastsSingleStep);
3113	}
3114
3115	Expr *Expr::IgnoreParenBaseCasts() {
3116	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3117	Fns&: IgnoreBaseCastsSingleStep);
3118	}
3119
3120	Expr *Expr::IgnoreParenNoopCasts(const ASTContext &Ctx) {
3121	auto IgnoreNoopCastsSingleStep = [&Ctx](Expr *E) {
3122	if (auto *CE = dyn_cast<CastExpr>(Val: E)) {
3123	// We ignore integer <-> casts that are of the same width, ptr<->ptr and
3124	// ptr<->int casts of the same width. We also ignore all identity casts.
3125	Expr *SubExpr = CE->getSubExpr();
3126	bool IsIdentityCast =
3127	Ctx.hasSameUnqualifiedType(T1: E->getType(), T2: SubExpr->getType());
3128	bool IsSameWidthCast = (E->getType()->isPointerType() ||
3129	E->getType()->isIntegralType(Ctx)) &&
3130	(SubExpr->getType()->isPointerType() ||
3131	SubExpr->getType()->isIntegralType(Ctx)) &&
3132	(Ctx.getTypeSize(T: E->getType()) ==
3133	Ctx.getTypeSize(T: SubExpr->getType()));
3134
3135	if (IsIdentityCast || IsSameWidthCast)
3136	return SubExpr;
3137	} else if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(Val: E))
3138	return NTTP->getReplacement();
3139
3140	return E;
3141	};
3142	return IgnoreExprNodes(E: this, Fns&: IgnoreParensSingleStep,
3143	Fns&: IgnoreNoopCastsSingleStep);
3144	}
3145
3146	Expr *Expr::IgnoreUnlessSpelledInSource() {
3147	auto IgnoreImplicitConstructorSingleStep = [](Expr *E) {
3148	if (auto *Cast = dyn_cast<CXXFunctionalCastExpr>(Val: E)) {
3149	auto *SE = Cast->getSubExpr();
3150	if (SE->getSourceRange() == E->getSourceRange())
3151	return SE;
3152	}
3153
3154	if (auto *C = dyn_cast<CXXConstructExpr>(Val: E)) {
3155	auto NumArgs = C->getNumArgs();
3156	if (NumArgs == 1 ||
3157	(NumArgs > 1 && isa<CXXDefaultArgExpr>(Val: C->getArg(Arg: 1)))) {
3158	Expr *A = C->getArg(Arg: 0);
3159	if (A->getSourceRange() == E->getSourceRange() || C->isElidable())
3160	return A;
3161	}
3162	}
3163	return E;
3164	};
3165	auto IgnoreImplicitMemberCallSingleStep = [](Expr *E) {
3166	if (auto *C = dyn_cast<CXXMemberCallExpr>(Val: E)) {
3167	Expr *ExprNode = C->getImplicitObjectArgument();
3168	if (ExprNode->getSourceRange() == E->getSourceRange()) {
3169	return ExprNode;
3170	}
3171	if (auto *PE = dyn_cast<ParenExpr>(Val: ExprNode)) {
3172	if (PE->getSourceRange() == C->getSourceRange()) {
3173	return cast<Expr>(Val: PE);
3174	}
3175	}
3176	ExprNode = ExprNode->IgnoreParenImpCasts();
3177	if (ExprNode->getSourceRange() == E->getSourceRange())
3178	return ExprNode;
3179	}
3180	return E;
3181	};
3182	return IgnoreExprNodes(
3183	E: this, Fns&: IgnoreImplicitSingleStep, Fns&: IgnoreImplicitCastsExtraSingleStep,
3184	Fns&: IgnoreParensOnlySingleStep, Fns&: IgnoreImplicitConstructorSingleStep,
3185	Fns&: IgnoreImplicitMemberCallSingleStep);
3186	}
3187
3188	bool Expr::isDefaultArgument() const {
3189	const Expr *E = this;
3190	if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3191	E = M->getSubExpr();
3192
3193	while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E))
3194	E = ICE->getSubExprAsWritten();
3195
3196	return isa<CXXDefaultArgExpr>(Val: E);
3197	}
3198
3199	/// Skip over any no-op casts and any temporary-binding
3200	/// expressions.
3201	static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) {
3202	if (const MaterializeTemporaryExpr *M = dyn_cast<MaterializeTemporaryExpr>(Val: E))
3203	E = M->getSubExpr();
3204
3205	while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3206	if (ICE->getCastKind() == CK_NoOp)
3207	E = ICE->getSubExpr();
3208	else
3209	break;
3210	}
3211
3212	while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(Val: E))
3213	E = BE->getSubExpr();
3214
3215	while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3216	if (ICE->getCastKind() == CK_NoOp)
3217	E = ICE->getSubExpr();
3218	else
3219	break;
3220	}
3221
3222	return E->IgnoreParens();
3223	}
3224
3225	/// isTemporaryObject - Determines if this expression produces a
3226	/// temporary of the given class type.
3227	bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const {
3228	if (!C.hasSameUnqualifiedType(T1: getType(), T2: C.getTypeDeclType(TempTy)))
3229	return false;
3230
3231	const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(E: this);
3232
3233	// Temporaries are by definition pr-values of class type.
3234	if (!E->Classify(Ctx&: C).isPRValue()) {
3235	// In this context, property reference is a message call and is pr-value.
3236	if (!isa<ObjCPropertyRefExpr>(Val: E))
3237	return false;
3238	}
3239
3240	// Black-list a few cases which yield pr-values of class type that don't
3241	// refer to temporaries of that type:
3242
3243	// - implicit derived-to-base conversions
3244	if (const auto *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3245	switch (ICE->getCastKind()) {
3246	case CK_DerivedToBase:
3247	case CK_UncheckedDerivedToBase:
3248	return false;
3249	default:
3250	break;
3251	}
3252	}
3253
3254	// - member expressions (all)
3255	if (isa<MemberExpr>(Val: E))
3256	return false;
3257
3258	if (const auto *BO = dyn_cast<BinaryOperator>(Val: E))
3259	if (BO->isPtrMemOp())
3260	return false;
3261
3262	// - opaque values (all)
3263	if (isa<OpaqueValueExpr>(Val: E))
3264	return false;
3265
3266	return true;
3267	}
3268
3269	bool Expr::isImplicitCXXThis() const {
3270	const Expr *E = this;
3271
3272	// Strip away parentheses and casts we don't care about.
3273	while (true) {
3274	if (const ParenExpr *Paren = dyn_cast<ParenExpr>(Val: E)) {
3275	E = Paren->getSubExpr();
3276	continue;
3277	}
3278
3279	if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
3280	if (ICE->getCastKind() == CK_NoOp ||
3281	ICE->getCastKind() == CK_LValueToRValue ||
3282	ICE->getCastKind() == CK_DerivedToBase ||
3283	ICE->getCastKind() == CK_UncheckedDerivedToBase) {
3284	E = ICE->getSubExpr();
3285	continue;
3286	}
3287	}
3288
3289	if (const UnaryOperator* UnOp = dyn_cast<UnaryOperator>(Val: E)) {
3290	if (UnOp->getOpcode() == UO_Extension) {
3291	E = UnOp->getSubExpr();
3292	continue;
3293	}
3294	}
3295
3296	if (const MaterializeTemporaryExpr *M
3297	= dyn_cast<MaterializeTemporaryExpr>(Val: E)) {
3298	E = M->getSubExpr();
3299	continue;
3300	}
3301
3302	break;
3303	}
3304
3305	if (const CXXThisExpr *This = dyn_cast<CXXThisExpr>(Val: E))
3306	return This->isImplicit();
3307
3308	return false;
3309	}
3310
3311	/// hasAnyTypeDependentArguments - Determines if any of the expressions
3312	/// in Exprs is type-dependent.
3313	bool Expr::hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs) {
3314	for (unsigned I = 0; I < Exprs.size(); ++I)
3315	if (Exprs[I]->isTypeDependent())
3316	return true;
3317
3318	return false;
3319	}
3320
3321	bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef,
3322	const Expr **Culprit) const {
3323	assert(!isValueDependent() &&
3324	"Expression evaluator can't be called on a dependent expression.");
3325
3326	// This function is attempting whether an expression is an initializer
3327	// which can be evaluated at compile-time. It very closely parallels
3328	// ConstExprEmitter in CGExprConstant.cpp; if they don't match, it
3329	// will lead to unexpected results. Like ConstExprEmitter, it falls back
3330	// to isEvaluatable most of the time.
3331	//
3332	// If we ever capture reference-binding directly in the AST, we can
3333	// kill the second parameter.
3334
3335	if (IsForRef) {
3336	if (auto *EWC = dyn_cast<ExprWithCleanups>(Val: this))
3337	return EWC->getSubExpr()->isConstantInitializer(Ctx, true, Culprit);
3338	if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Val: this))
3339	return MTE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3340	EvalResult Result;
3341	if (EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects)
3342	return true;
3343	if (Culprit)
3344	*Culprit = this;
3345	return false;
3346	}
3347
3348	switch (getStmtClass()) {
3349	default: break;
3350	case Stmt::ExprWithCleanupsClass:
3351	return cast<ExprWithCleanups>(Val: this)->getSubExpr()->isConstantInitializer(
3352	Ctx, IsForRef, Culprit);
3353	case StringLiteralClass:
3354	case ObjCEncodeExprClass:
3355	return true;
3356	case CXXTemporaryObjectExprClass:
3357	case CXXConstructExprClass: {
3358	const CXXConstructExpr *CE = cast<CXXConstructExpr>(Val: this);
3359
3360	if (CE->getConstructor()->isTrivial() &&
3361	CE->getConstructor()->getParent()->hasTrivialDestructor()) {
3362	// Trivial default constructor
3363	if (!CE->getNumArgs()) return true;
3364
3365	// Trivial copy constructor
3366	assert(CE->getNumArgs() == 1 && "trivial ctor with > 1 argument");
3367	return CE->getArg(Arg: 0)->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3368	}
3369
3370	break;
3371	}
3372	case ConstantExprClass: {
3373	// FIXME: We should be able to return "true" here, but it can lead to extra
3374	// error messages. E.g. in Sema/array-init.c.
3375	const Expr *Exp = cast<ConstantExpr>(Val: this)->getSubExpr();
3376	return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3377	}
3378	case CompoundLiteralExprClass: {
3379	// This handles gcc's extension that allows global initializers like
3380	// "struct x {int x;} x = (struct x) {};".
3381	// FIXME: This accepts other cases it shouldn't!
3382	const Expr *Exp = cast<CompoundLiteralExpr>(Val: this)->getInitializer();
3383	return Exp->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3384	}
3385	case DesignatedInitUpdateExprClass: {
3386	const DesignatedInitUpdateExpr *DIUE = cast<DesignatedInitUpdateExpr>(Val: this);
3387	return DIUE->getBase()->isConstantInitializer(Ctx, IsForRef: false, Culprit) &&
3388	DIUE->getUpdater()->isConstantInitializer(Ctx, false, Culprit);
3389	}
3390	case InitListExprClass: {
3391	// C++ [dcl.init.aggr]p2:
3392	// The elements of an aggregate are:
3393	// - for an array, the array elements in increasing subscript order, or
3394	// - for a class, the direct base classes in declaration order, followed
3395	// by the direct non-static data members (11.4) that are not members of
3396	// an anonymous union, in declaration order.
3397	const InitListExpr *ILE = cast<InitListExpr>(Val: this);
3398	assert(ILE->isSemanticForm() && "InitListExpr must be in semantic form");
3399	if (ILE->getType()->isArrayType()) {
3400	unsigned numInits = ILE->getNumInits();
3401	for (unsigned i = 0; i < numInits; i++) {
3402	if (!ILE->getInit(Init: i)->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3403	return false;
3404	}
3405	return true;
3406	}
3407
3408	if (ILE->getType()->isRecordType()) {
3409	unsigned ElementNo = 0;
3410	RecordDecl *RD = ILE->getType()->castAs<RecordType>()->getDecl();
3411
3412	// In C++17, bases were added to the list of members used by aggregate
3413	// initialization.
3414	if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
3415	for (unsigned i = 0, e = CXXRD->getNumBases(); i < e; i++) {
3416	if (ElementNo < ILE->getNumInits()) {
3417	const Expr *Elt = ILE->getInit(Init: ElementNo++);
3418	if (!Elt->isConstantInitializer(Ctx, IsForRef: false, Culprit))
3419	return false;
3420	}
3421	}
3422	}
3423
3424	for (const auto *Field : RD->fields()) {
3425	// If this is a union, skip all the fields that aren't being initialized.
3426	if (RD->isUnion() && ILE->getInitializedFieldInUnion() != Field)
3427	continue;
3428
3429	// Don't emit anonymous bitfields, they just affect layout.
3430	if (Field->isUnnamedBitField())
3431	continue;
3432
3433	if (ElementNo < ILE->getNumInits()) {
3434	const Expr *Elt = ILE->getInit(ElementNo++);
3435	if (Field->isBitField()) {
3436	// Bitfields have to evaluate to an integer.
3437	EvalResult Result;
3438	if (!Elt->EvaluateAsInt(Result, Ctx)) {
3439	if (Culprit)
3440	*Culprit = Elt;
3441	return false;
3442	}
3443	} else {
3444	bool RefType = Field->getType()->isReferenceType();
3445	if (!Elt->isConstantInitializer(Ctx, RefType, Culprit))
3446	return false;
3447	}
3448	}
3449	}
3450	return true;
3451	}
3452
3453	break;
3454	}
3455	case ImplicitValueInitExprClass:
3456	case NoInitExprClass:
3457	return true;
3458	case ParenExprClass:
3459	return cast<ParenExpr>(Val: this)->getSubExpr()
3460	->isConstantInitializer(Ctx, IsForRef, Culprit);
3461	case GenericSelectionExprClass:
3462	return cast<GenericSelectionExpr>(Val: this)->getResultExpr()
3463	->isConstantInitializer(Ctx, IsForRef, Culprit);
3464	case ChooseExprClass:
3465	if (cast<ChooseExpr>(Val: this)->isConditionDependent()) {
3466	if (Culprit)
3467	*Culprit = this;
3468	return false;
3469	}
3470	return cast<ChooseExpr>(Val: this)->getChosenSubExpr()
3471	->isConstantInitializer(Ctx, IsForRef, Culprit);
3472	case UnaryOperatorClass: {
3473	const UnaryOperator* Exp = cast<UnaryOperator>(Val: this);
3474	if (Exp->getOpcode() == UO_Extension)
3475	return Exp->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3476	break;
3477	}
3478	case PackIndexingExprClass: {
3479	return cast<PackIndexingExpr>(Val: this)
3480	->getSelectedExpr()
3481	->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3482	}
3483	case CXXFunctionalCastExprClass:
3484	case CXXStaticCastExprClass:
3485	case ImplicitCastExprClass:
3486	case CStyleCastExprClass:
3487	case ObjCBridgedCastExprClass:
3488	case CXXDynamicCastExprClass:
3489	case CXXReinterpretCastExprClass:
3490	case CXXAddrspaceCastExprClass:
3491	case CXXConstCastExprClass: {
3492	const CastExpr *CE = cast<CastExpr>(Val: this);
3493
3494	// Handle misc casts we want to ignore.
3495	if (CE->getCastKind() == CK_NoOp ||
3496	CE->getCastKind() == CK_LValueToRValue ||
3497	CE->getCastKind() == CK_ToUnion ||
3498	CE->getCastKind() == CK_ConstructorConversion ||
3499	CE->getCastKind() == CK_NonAtomicToAtomic ||
3500	CE->getCastKind() == CK_AtomicToNonAtomic ||
3501	CE->getCastKind() == CK_NullToPointer ||
3502	CE->getCastKind() == CK_IntToOCLSampler)
3503	return CE->getSubExpr()->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3504
3505	break;
3506	}
3507	case MaterializeTemporaryExprClass:
3508	return cast<MaterializeTemporaryExpr>(Val: this)
3509	->getSubExpr()
3510	->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3511
3512	case SubstNonTypeTemplateParmExprClass:
3513	return cast<SubstNonTypeTemplateParmExpr>(Val: this)->getReplacement()
3514	->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3515	case CXXDefaultArgExprClass:
3516	return cast<CXXDefaultArgExpr>(Val: this)->getExpr()
3517	->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3518	case CXXDefaultInitExprClass:
3519	return cast<CXXDefaultInitExpr>(Val: this)->getExpr()
3520	->isConstantInitializer(Ctx, IsForRef: false, Culprit);
3521	}
3522	// Allow certain forms of UB in constant initializers: signed integer
3523	// overflow and floating-point division by zero. We'll give a warning on
3524	// these, but they're common enough that we have to accept them.
3525	if (isEvaluatable(Ctx, AllowSideEffects: SE_AllowUndefinedBehavior))
3526	return true;
3527	if (Culprit)
3528	*Culprit = this;
3529	return false;
3530	}
3531
3532	bool CallExpr::isBuiltinAssumeFalse(const ASTContext &Ctx) const {
3533	unsigned BuiltinID = getBuiltinCallee();
3534	if (BuiltinID != Builtin::BI__assume &&
3535	BuiltinID != Builtin::BI__builtin_assume)
3536	return false;
3537
3538	const Expr* Arg = getArg(Arg: 0);
3539	bool ArgVal;
3540	return !Arg->isValueDependent() &&
3541	Arg->EvaluateAsBooleanCondition(Result&: ArgVal, Ctx) && !ArgVal;
3542	}
3543
3544	bool CallExpr::isCallToStdMove() const {
3545	return getBuiltinCallee() == Builtin::BImove;
3546	}
3547
3548	namespace {
3549	/// Look for any side effects within a Stmt.
3550	class SideEffectFinder : public ConstEvaluatedExprVisitor<SideEffectFinder> {
3551	typedef ConstEvaluatedExprVisitor<SideEffectFinder> Inherited;
3552	const bool IncludePossibleEffects;
3553	bool HasSideEffects;
3554
3555	public:
3556	explicit SideEffectFinder(const ASTContext &Context, bool IncludePossible)
3557	: Inherited(Context),
3558	IncludePossibleEffects(IncludePossible), HasSideEffects(false) { }
3559
3560	bool hasSideEffects() const { return HasSideEffects; }
3561
3562	void VisitDecl(const Decl *D) {
3563	if (!D)
3564	return;
3565
3566	// We assume the caller checks subexpressions (eg, the initializer, VLA
3567	// bounds) for side-effects on our behalf.
3568	if (auto *VD = dyn_cast<VarDecl>(Val: D)) {
3569	// Registering a destructor is a side-effect.
3570	if (IncludePossibleEffects && VD->isThisDeclarationADefinition() &&
3571	VD->needsDestruction(Ctx: Context))
3572	HasSideEffects = true;
3573	}
3574	}
3575
3576	void VisitDeclStmt(const DeclStmt *DS) {
3577	for (auto *D : DS->decls())
3578	VisitDecl(D);
3579	Inherited::VisitDeclStmt(DS);
3580	}
3581
3582	void VisitExpr(const Expr *E) {
3583	if (!HasSideEffects &&
3584	E->HasSideEffects(Ctx: Context, IncludePossibleEffects))
3585	HasSideEffects = true;
3586	}
3587	};
3588	}
3589
3590	bool Expr::HasSideEffects(const ASTContext &Ctx,
3591	bool IncludePossibleEffects) const {
3592	// In circumstances where we care about definite side effects instead of
3593	// potential side effects, we want to ignore expressions that are part of a
3594	// macro expansion as a potential side effect.
3595	if (!IncludePossibleEffects && getExprLoc().isMacroID())
3596	return false;
3597
3598	switch (getStmtClass()) {
3599	case NoStmtClass:
3600	#define ABSTRACT_STMT(Type)
3601	#define STMT(Type, Base) case Type##Class:
3602	#define EXPR(Type, Base)
3603	#include "clang/AST/StmtNodes.inc"
3604	llvm_unreachable("unexpected Expr kind");
3605
3606	case DependentScopeDeclRefExprClass:
3607	case CXXUnresolvedConstructExprClass:
3608	case CXXDependentScopeMemberExprClass:
3609	case UnresolvedLookupExprClass:
3610	case UnresolvedMemberExprClass:
3611	case PackExpansionExprClass:
3612	case SubstNonTypeTemplateParmPackExprClass:
3613	case FunctionParmPackExprClass:
3614	case TypoExprClass:
3615	case RecoveryExprClass:
3616	case CXXFoldExprClass:
3617	// Make a conservative assumption for dependent nodes.
3618	return IncludePossibleEffects;
3619
3620	case DeclRefExprClass:
3621	case ObjCIvarRefExprClass:
3622	case PredefinedExprClass:
3623	case IntegerLiteralClass:
3624	case FixedPointLiteralClass:
3625	case FloatingLiteralClass:
3626	case ImaginaryLiteralClass:
3627	case StringLiteralClass:
3628	case CharacterLiteralClass:
3629	case OffsetOfExprClass:
3630	case ImplicitValueInitExprClass:
3631	case UnaryExprOrTypeTraitExprClass:
3632	case AddrLabelExprClass:
3633	case GNUNullExprClass:
3634	case ArrayInitIndexExprClass:
3635	case NoInitExprClass:
3636	case CXXBoolLiteralExprClass:
3637	case CXXNullPtrLiteralExprClass:
3638	case CXXThisExprClass:
3639	case CXXScalarValueInitExprClass:
3640	case TypeTraitExprClass:
3641	case ArrayTypeTraitExprClass:
3642	case ExpressionTraitExprClass:
3643	case CXXNoexceptExprClass:
3644	case SizeOfPackExprClass:
3645	case ObjCStringLiteralClass:
3646	case ObjCEncodeExprClass:
3647	case ObjCBoolLiteralExprClass:
3648	case ObjCAvailabilityCheckExprClass:
3649	case CXXUuidofExprClass:
3650	case OpaqueValueExprClass:
3651	case SourceLocExprClass:
3652	case EmbedExprClass:
3653	case ConceptSpecializationExprClass:
3654	case RequiresExprClass:
3655	case SYCLUniqueStableNameExprClass:
3656	case PackIndexingExprClass:
3657	case HLSLOutArgExprClass:
3658	case OpenACCAsteriskSizeExprClass:
3659	// These never have a side-effect.
3660	return false;
3661
3662	case ConstantExprClass:
3663	// FIXME: Move this into the "return false;" block above.
3664	return cast<ConstantExpr>(this)->getSubExpr()->HasSideEffects(
3665	Ctx, IncludePossibleEffects);
3666
3667	case CallExprClass:
3668	case CXXOperatorCallExprClass:
3669	case CXXMemberCallExprClass:
3670	case CUDAKernelCallExprClass:
3671	case UserDefinedLiteralClass: {
3672	// We don't know a call definitely has side effects, except for calls
3673	// to pure/const functions that definitely don't.
3674	// If the call itself is considered side-effect free, check the operands.
3675	const Decl *FD = cast<CallExpr>(this)->getCalleeDecl();
3676	bool IsPure = FD && (FD->hasAttr<ConstAttr>() || FD->hasAttr<PureAttr>());
3677	if (IsPure || !IncludePossibleEffects)
3678	break;
3679	return true;
3680	}
3681
3682	case BlockExprClass:
3683	case CXXBindTemporaryExprClass:
3684	if (!IncludePossibleEffects)
3685	break;
3686	return true;
3687
3688	case MSPropertyRefExprClass:
3689	case MSPropertySubscriptExprClass:
3690	case CompoundAssignOperatorClass:
3691	case VAArgExprClass:
3692	case AtomicExprClass:
3693	case CXXThrowExprClass:
3694	case CXXNewExprClass:
3695	case CXXDeleteExprClass:
3696	case CoawaitExprClass:
3697	case DependentCoawaitExprClass:
3698	case CoyieldExprClass:
3699	// These always have a side-effect.
3700	return true;
3701
3702	case StmtExprClass: {
3703	// StmtExprs have a side-effect if any substatement does.
3704	SideEffectFinder Finder(Ctx, IncludePossibleEffects);
3705	Finder.Visit(S: cast<StmtExpr>(this)->getSubStmt());
3706	return Finder.hasSideEffects();
3707	}
3708
3709	case ExprWithCleanupsClass:
3710	if (IncludePossibleEffects)
3711	if (cast<ExprWithCleanups>(this)->cleanupsHaveSideEffects())
3712	return true;
3713	break;
3714
3715	case ParenExprClass:
3716	case ArraySubscriptExprClass:
3717	case MatrixSubscriptExprClass:
3718	case ArraySectionExprClass:
3719	case OMPArrayShapingExprClass:
3720	case OMPIteratorExprClass:
3721	case MemberExprClass:
3722	case ConditionalOperatorClass:
3723	case BinaryConditionalOperatorClass:
3724	case CompoundLiteralExprClass:
3725	case ExtVectorElementExprClass:
3726	case DesignatedInitExprClass:
3727	case DesignatedInitUpdateExprClass:
3728	case ArrayInitLoopExprClass:
3729	case ParenListExprClass:
3730	case CXXPseudoDestructorExprClass:
3731	case CXXRewrittenBinaryOperatorClass:
3732	case CXXStdInitializerListExprClass:
3733	case SubstNonTypeTemplateParmExprClass:
3734	case MaterializeTemporaryExprClass:
3735	case ShuffleVectorExprClass:
3736	case ConvertVectorExprClass:
3737	case AsTypeExprClass:
3738	case CXXParenListInitExprClass:
3739	// These have a side-effect if any subexpression does.
3740	break;
3741
3742	case UnaryOperatorClass:
3743	if (cast<UnaryOperator>(this)->isIncrementDecrementOp())
3744	return true;
3745	break;
3746
3747	case BinaryOperatorClass:
3748	if (cast<BinaryOperator>(this)->isAssignmentOp())
3749	return true;
3750	break;
3751
3752	case InitListExprClass:
3753	// FIXME: The children for an InitListExpr doesn't include the array filler.
3754	if (const Expr *E = cast<InitListExpr>(this)->getArrayFiller())
3755	if (E->HasSideEffects(Ctx, IncludePossibleEffects))
3756	return true;
3757	break;
3758
3759	case GenericSelectionExprClass:
3760	return cast<GenericSelectionExpr>(this)->getResultExpr()->
3761	HasSideEffects(Ctx, IncludePossibleEffects);
3762
3763	case ChooseExprClass:
3764	return cast<ChooseExpr>(this)->getChosenSubExpr()->HasSideEffects(
3765	Ctx, IncludePossibleEffects);
3766
3767	case CXXDefaultArgExprClass:
3768	return cast<CXXDefaultArgExpr>(this)->getExpr()->HasSideEffects(
3769	Ctx, IncludePossibleEffects);
3770
3771	case CXXDefaultInitExprClass: {
3772	const FieldDecl *FD = cast<CXXDefaultInitExpr>(this)->getField();
3773	if (const Expr *E = FD->getInClassInitializer())
3774	return E->HasSideEffects(Ctx, IncludePossibleEffects);
3775	// If we've not yet parsed the initializer, assume it has side-effects.
3776	return true;
3777	}
3778
3779	case CXXDynamicCastExprClass: {
3780	// A dynamic_cast expression has side-effects if it can throw.
3781	const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(this);
3782	if (DCE->getTypeAsWritten()->isReferenceType() &&
3783	DCE->getCastKind() == CK_Dynamic)
3784	return true;
3785	}
3786	[[fallthrough]];
3787	case ImplicitCastExprClass:
3788	case CStyleCastExprClass:
3789	case CXXStaticCastExprClass:
3790	case CXXReinterpretCastExprClass:
3791	case CXXConstCastExprClass:
3792	case CXXAddrspaceCastExprClass:
3793	case CXXFunctionalCastExprClass:
3794	case BuiltinBitCastExprClass: {
3795	// While volatile reads are side-effecting in both C and C++, we treat them
3796	// as having possible (not definite) side-effects. This allows idiomatic
3797	// code to behave without warning, such as sizeof(*v) for a volatile-
3798	// qualified pointer.
3799	if (!IncludePossibleEffects)
3800	break;
3801
3802	const CastExpr *CE = cast<CastExpr>(this);
3803	if (CE->getCastKind() == CK_LValueToRValue &&
3804	CE->getSubExpr()->getType().isVolatileQualified())
3805	return true;
3806	break;
3807	}
3808
3809	case CXXTypeidExprClass: {
3810	const auto *TE = cast<CXXTypeidExpr>(this);
3811	if (!TE->isPotentiallyEvaluated())
3812	return false;
3813
3814	// If this type id expression can throw because of a null pointer, that is a
3815	// side-effect independent of if the operand has a side-effect
3816	if (IncludePossibleEffects && TE->hasNullCheck())
3817	return true;
3818
3819	break;
3820	}
3821
3822	case CXXConstructExprClass:
3823	case CXXTemporaryObjectExprClass: {
3824	const CXXConstructExpr *CE = cast<CXXConstructExpr>(this);
3825	if (!CE->getConstructor()->isTrivial() && IncludePossibleEffects)
3826	return true;
3827	// A trivial constructor does not add any side-effects of its own. Just look
3828	// at its arguments.
3829	break;
3830	}
3831
3832	case CXXInheritedCtorInitExprClass: {
3833	const auto *ICIE = cast<CXXInheritedCtorInitExpr>(this);
3834	if (!ICIE->getConstructor()->isTrivial() && IncludePossibleEffects)
3835	return true;
3836	break;
3837	}
3838
3839	case LambdaExprClass: {
3840	const LambdaExpr *LE = cast<LambdaExpr>(this);
3841	for (Expr *E : LE->capture_inits())
3842	if (E && E->HasSideEffects(Ctx, IncludePossibleEffects))
3843	return true;
3844	return false;
3845	}
3846
3847	case PseudoObjectExprClass: {
3848	// Only look for side-effects in the semantic form, and look past
3849	// OpaqueValueExpr bindings in that form.
3850	const PseudoObjectExpr *PO = cast<PseudoObjectExpr>(this);
3851	for (PseudoObjectExpr::const_semantics_iterator I = PO->semantics_begin(),
3852	E = PO->semantics_end();
3853	I != E; ++I) {
3854	const Expr *Subexpr = *I;
3855	if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Subexpr))
3856	Subexpr = OVE->getSourceExpr();
3857	if (Subexpr->HasSideEffects(Ctx, IncludePossibleEffects))
3858	return true;
3859	}
3860	return false;
3861	}
3862
3863	case ObjCBoxedExprClass:
3864	case ObjCArrayLiteralClass:
3865	case ObjCDictionaryLiteralClass:
3866	case ObjCSelectorExprClass:
3867	case ObjCProtocolExprClass:
3868	case ObjCIsaExprClass:
3869	case ObjCIndirectCopyRestoreExprClass:
3870	case ObjCSubscriptRefExprClass:
3871	case ObjCBridgedCastExprClass:
3872	case ObjCMessageExprClass:
3873	case ObjCPropertyRefExprClass:
3874	// FIXME: Classify these cases better.
3875	if (IncludePossibleEffects)
3876	return true;
3877	break;
3878	}
3879
3880	// Recurse to children.
3881	for (const Stmt *SubStmt : children())
3882	if (SubStmt &&
3883	cast<Expr>(SubStmt)->HasSideEffects(Ctx, IncludePossibleEffects))
3884	return true;
3885
3886	return false;
3887	}
3888
3889	FPOptions Expr::getFPFeaturesInEffect(const LangOptions &LO) const {
3890	if (auto Call = dyn_cast<CallExpr>(Val: this))
3891	return Call->getFPFeaturesInEffect(LO);
3892	if (auto UO = dyn_cast<UnaryOperator>(Val: this))
3893	return UO->getFPFeaturesInEffect(LO);
3894	if (auto BO = dyn_cast<BinaryOperator>(Val: this))
3895	return BO->getFPFeaturesInEffect(LO);
3896	if (auto Cast = dyn_cast<CastExpr>(Val: this))
3897	return Cast->getFPFeaturesInEffect(LO);
3898	if (auto ConvertVector = dyn_cast<ConvertVectorExpr>(Val: this))
3899	return ConvertVector->getFPFeaturesInEffect(LO);
3900	return FPOptions::defaultWithoutTrailingStorage(LO);
3901	}
3902
3903	namespace {
3904	/// Look for a call to a non-trivial function within an expression.
3905	class NonTrivialCallFinder : public ConstEvaluatedExprVisitor<NonTrivialCallFinder>
3906	{
3907	typedef ConstEvaluatedExprVisitor<NonTrivialCallFinder> Inherited;
3908
3909	bool NonTrivial;
3910
3911	public:
3912	explicit NonTrivialCallFinder(const ASTContext &Context)
3913	: Inherited(Context), NonTrivial(false) { }
3914
3915	bool hasNonTrivialCall() const { return NonTrivial; }
3916
3917	void VisitCallExpr(const CallExpr *E) {
3918	if (const CXXMethodDecl *Method
3919	= dyn_cast_or_null<const CXXMethodDecl>(Val: E->getCalleeDecl())) {
3920	if (Method->isTrivial()) {
3921	// Recurse to children of the call.
3922	Inherited::VisitStmt(E);
3923	return;
3924	}
3925	}
3926
3927	NonTrivial = true;
3928	}
3929
3930	void VisitCXXConstructExpr(const CXXConstructExpr *E) {
3931	if (E->getConstructor()->isTrivial()) {
3932	// Recurse to children of the call.
3933	Inherited::VisitStmt(E);
3934	return;
3935	}
3936
3937	NonTrivial = true;
3938	}
3939
3940	void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) {
3941	// Destructor of the temporary might be null if destructor declaration
3942	// is not valid.
3943	if (const CXXDestructorDecl *DtorDecl =
3944	E->getTemporary()->getDestructor()) {
3945	if (DtorDecl->isTrivial()) {
3946	Inherited::VisitStmt(E);
3947	return;
3948	}
3949	}
3950
3951	NonTrivial = true;
3952	}
3953	};
3954	}
3955
3956	bool Expr::hasNonTrivialCall(const ASTContext &Ctx) const {
3957	NonTrivialCallFinder Finder(Ctx);
3958	Finder.Visit(this);
3959	return Finder.hasNonTrivialCall();
3960	}
3961
3962	/// isNullPointerConstant - C99 6.3.2.3p3 - Return whether this is a null
3963	/// pointer constant or not, as well as the specific kind of constant detected.
3964	/// Null pointer constants can be integer constant expressions with the
3965	/// value zero, casts of zero to void*, nullptr (C++0X), or __null
3966	/// (a GNU extension).
3967	Expr::NullPointerConstantKind
3968	Expr::isNullPointerConstant(ASTContext &Ctx,
3969	NullPointerConstantValueDependence NPC) const {
3970	if (isValueDependent() &&
3971	(!Ctx.getLangOpts().CPlusPlus11 || Ctx.getLangOpts().MSVCCompat)) {
3972	// Error-dependent expr should never be a null pointer.
3973	if (containsErrors())
3974	return NPCK_NotNull;
3975	switch (NPC) {
3976	case NPC_NeverValueDependent:
3977	llvm_unreachable("Unexpected value dependent expression!");
3978	case NPC_ValueDependentIsNull:
3979	if (isTypeDependent() || getType()->isIntegralType(Ctx))
3980	return NPCK_ZeroExpression;
3981	else
3982	return NPCK_NotNull;
3983
3984	case NPC_ValueDependentIsNotNull:
3985	return NPCK_NotNull;
3986	}
3987	}
3988
3989	// Strip off a cast to void*, if it exists. Except in C++.
3990	if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(Val: this)) {
3991	if (!Ctx.getLangOpts().CPlusPlus) {
3992	// Check that it is a cast to void*.
3993	if (const PointerType *PT = CE->getType()->getAs<PointerType>()) {
3994	QualType Pointee = PT->getPointeeType();
3995	Qualifiers Qs = Pointee.getQualifiers();
3996	// Only (void*)0 or equivalent are treated as nullptr. If pointee type
3997	// has non-default address space it is not treated as nullptr.
3998	// (__generic void*)0 in OpenCL 2.0 should not be treated as nullptr
3999	// since it cannot be assigned to a pointer to constant address space.
4000	if (Ctx.getLangOpts().OpenCL &&
4001	Pointee.getAddressSpace() == Ctx.getDefaultOpenCLPointeeAddrSpace())
4002	Qs.removeAddressSpace();
4003
4004	if (Pointee->isVoidType() && Qs.empty() && // to void*
4005	CE->getSubExpr()->getType()->isIntegerType()) // from int
4006	return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4007	}
4008	}
4009	} else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: this)) {
4010	// Ignore the ImplicitCastExpr type entirely.
4011	return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4012	} else if (const ParenExpr *PE = dyn_cast<ParenExpr>(Val: this)) {
4013	// Accept ((void*)0) as a null pointer constant, as many other
4014	// implementations do.
4015	return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4016	} else if (const GenericSelectionExpr *GE =
4017	dyn_cast<GenericSelectionExpr>(Val: this)) {
4018	if (GE->isResultDependent())
4019	return NPCK_NotNull;
4020	return GE->getResultExpr()->isNullPointerConstant(Ctx, NPC);
4021	} else if (const ChooseExpr *CE = dyn_cast<ChooseExpr>(Val: this)) {
4022	if (CE->isConditionDependent())
4023	return NPCK_NotNull;
4024	return CE->getChosenSubExpr()->isNullPointerConstant(Ctx, NPC);
4025	} else if (const CXXDefaultArgExpr *DefaultArg
4026	= dyn_cast<CXXDefaultArgExpr>(Val: this)) {
4027	// See through default argument expressions.
4028	return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC);
4029	} else if (const CXXDefaultInitExpr *DefaultInit
4030	= dyn_cast<CXXDefaultInitExpr>(Val: this)) {
4031	// See through default initializer expressions.
4032	return DefaultInit->getExpr()->isNullPointerConstant(Ctx, NPC);
4033	} else if (isa<GNUNullExpr>(Val: this)) {
4034	// The GNU __null extension is always a null pointer constant.
4035	return NPCK_GNUNull;
4036	} else if (const MaterializeTemporaryExpr *M
4037	= dyn_cast<MaterializeTemporaryExpr>(Val: this)) {
4038	return M->getSubExpr()->isNullPointerConstant(Ctx, NPC);
4039	} else if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Val: this)) {
4040	if (const Expr *Source = OVE->getSourceExpr())
4041	return Source->isNullPointerConstant(Ctx, NPC);
4042	}
4043
4044	// If the expression has no type information, it cannot be a null pointer
4045	// constant.
4046	if (getType().isNull())
4047	return NPCK_NotNull;
4048
4049	// C++11/C23 nullptr_t is always a null pointer constant.
4050	if (getType()->isNullPtrType())
4051	return NPCK_CXX11_nullptr;
4052
4053	if (const RecordType *UT = getType()->getAsUnionType())
4054	if (!Ctx.getLangOpts().CPlusPlus11 &&
4055	UT && UT->getDecl()->hasAttr<TransparentUnionAttr>())
4056	if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Val: this)){
4057	const Expr *InitExpr = CLE->getInitializer();
4058	if (const InitListExpr *ILE = dyn_cast<InitListExpr>(Val: InitExpr))
4059	return ILE->getInit(Init: 0)->isNullPointerConstant(Ctx, NPC);
4060	}
4061	// This expression must be an integer type.
4062	if (!getType()->isIntegerType() ||
4063	(Ctx.getLangOpts().CPlusPlus && getType()->isEnumeralType()))
4064	return NPCK_NotNull;
4065
4066	if (Ctx.getLangOpts().CPlusPlus11) {
4067	// C++11 [conv.ptr]p1: A null pointer constant is an integer literal with
4068	// value zero or a prvalue of type std::nullptr_t.
4069	// Microsoft mode permits C++98 rules reflecting MSVC behavior.
4070	const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(Val: this);
4071	if (Lit && !Lit->getValue())
4072	return NPCK_ZeroLiteral;
4073	if (!Ctx.getLangOpts().MSVCCompat || !isCXX98IntegralConstantExpr(Ctx))
4074	return NPCK_NotNull;
4075	} else {
4076	// If we have an integer constant expression, we need to *evaluate* it and
4077	// test for the value 0.
4078	if (!isIntegerConstantExpr(Ctx))
4079	return NPCK_NotNull;
4080	}
4081
4082	if (EvaluateKnownConstInt(Ctx) != 0)
4083	return NPCK_NotNull;
4084
4085	if (isa<IntegerLiteral>(Val: this))
4086	return NPCK_ZeroLiteral;
4087	return NPCK_ZeroExpression;
4088	}
4089
4090	/// If this expression is an l-value for an Objective C
4091	/// property, find the underlying property reference expression.
4092	const ObjCPropertyRefExpr *Expr::getObjCProperty() const {
4093	const Expr *E = this;
4094	while (true) {
4095	assert((E->isLValue() && E->getObjectKind() == OK_ObjCProperty) &&
4096	"expression is not a property reference");
4097	E = E->IgnoreParenCasts();
4098	if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: E)) {
4099	if (BO->getOpcode() == BO_Comma) {
4100	E = BO->getRHS();
4101	continue;
4102	}
4103	}
4104
4105	break;
4106	}
4107
4108	return cast<ObjCPropertyRefExpr>(Val: E);
4109	}
4110
4111	bool Expr::isObjCSelfExpr() const {
4112	const Expr *E = IgnoreParenImpCasts();
4113
4114	const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E);
4115	if (!DRE)
4116	return false;
4117
4118	const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(Val: DRE->getDecl());
4119	if (!Param)
4120	return false;
4121
4122	const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Param->getDeclContext());
4123	if (!M)
4124	return false;
4125
4126	return M->getSelfDecl() == Param;
4127	}
4128
4129	FieldDecl *Expr::getSourceBitField() {
4130	Expr *E = this->IgnoreParens();
4131
4132	while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4133	if (ICE->getCastKind() == CK_LValueToRValue ||
4134	(ICE->isGLValue() && ICE->getCastKind() == CK_NoOp))
4135	E = ICE->getSubExpr()->IgnoreParens();
4136	else
4137	break;
4138	}
4139
4140	if (MemberExpr *MemRef = dyn_cast<MemberExpr>(Val: E))
4141	if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: MemRef->getMemberDecl()))
4142	if (Field->isBitField())
4143	return Field;
4144
4145	if (ObjCIvarRefExpr *IvarRef = dyn_cast<ObjCIvarRefExpr>(Val: E)) {
4146	FieldDecl *Ivar = IvarRef->getDecl();
4147	if (Ivar->isBitField())
4148	return Ivar;
4149	}
4150
4151	if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(Val: E)) {
4152	if (FieldDecl *Field = dyn_cast<FieldDecl>(Val: DeclRef->getDecl()))
4153	if (Field->isBitField())
4154	return Field;
4155
4156	if (BindingDecl *BD = dyn_cast<BindingDecl>(Val: DeclRef->getDecl()))
4157	if (Expr *E = BD->getBinding())
4158	return E->getSourceBitField();
4159	}
4160
4161	if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(Val: E)) {
4162	if (BinOp->isAssignmentOp() && BinOp->getLHS())
4163	return BinOp->getLHS()->getSourceBitField();
4164
4165	if (BinOp->getOpcode() == BO_Comma && BinOp->getRHS())
4166	return BinOp->getRHS()->getSourceBitField();
4167	}
4168
4169	if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Val: E))
4170	if (UnOp->isPrefix() && UnOp->isIncrementDecrementOp())
4171	return UnOp->getSubExpr()->getSourceBitField();
4172
4173	return nullptr;
4174	}
4175
4176	EnumConstantDecl *Expr::getEnumConstantDecl() {
4177	Expr *E = this->IgnoreParenImpCasts();
4178	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4179	return dyn_cast<EnumConstantDecl>(Val: DRE->getDecl());
4180	return nullptr;
4181	}
4182
4183	bool Expr::refersToVectorElement() const {
4184	// FIXME: Why do we not just look at the ObjectKind here?
4185	const Expr *E = this->IgnoreParens();
4186
4187	while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: E)) {
4188	if (ICE->isGLValue() && ICE->getCastKind() == CK_NoOp)
4189	E = ICE->getSubExpr()->IgnoreParens();
4190	else
4191	break;
4192	}
4193
4194	if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(Val: E))
4195	return ASE->getBase()->getType()->isVectorType();
4196
4197	if (isa<ExtVectorElementExpr>(Val: E))
4198	return true;
4199
4200	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4201	if (auto *BD = dyn_cast<BindingDecl>(Val: DRE->getDecl()))
4202	if (auto *E = BD->getBinding())
4203	return E->refersToVectorElement();
4204
4205	return false;
4206	}
4207
4208	bool Expr::refersToGlobalRegisterVar() const {
4209	const Expr *E = this->IgnoreParenImpCasts();
4210
4211	if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: E))
4212	if (const auto *VD = dyn_cast<VarDecl>(Val: DRE->getDecl()))
4213	if (VD->getStorageClass() == SC_Register &&
4214	VD->hasAttr<AsmLabelAttr>() && !VD->isLocalVarDecl())
4215	return true;
4216
4217	return false;
4218	}
4219
4220	bool Expr::isSameComparisonOperand(const Expr* E1, const Expr* E2) {
4221	E1 = E1->IgnoreParens();
4222	E2 = E2->IgnoreParens();
4223
4224	if (E1->getStmtClass() != E2->getStmtClass())
4225	return false;
4226
4227	switch (E1->getStmtClass()) {
4228	default:
4229	return false;
4230	case CXXThisExprClass:
4231	return true;
4232	case DeclRefExprClass: {
4233	// DeclRefExpr without an ImplicitCastExpr can happen for integral
4234	// template parameters.
4235	const auto *DRE1 = cast<DeclRefExpr>(Val: E1);
4236	const auto *DRE2 = cast<DeclRefExpr>(Val: E2);
4237	return DRE1->isPRValue() && DRE2->isPRValue() &&
4238	DRE1->getDecl() == DRE2->getDecl();
4239	}
4240	case ImplicitCastExprClass: {
4241	// Peel off implicit casts.
4242	while (true) {
4243	const auto *ICE1 = dyn_cast<ImplicitCastExpr>(Val: E1);
4244	const auto *ICE2 = dyn_cast<ImplicitCastExpr>(Val: E2);
4245	if (!ICE1 || !ICE2)
4246	return false;
4247	if (ICE1->getCastKind() != ICE2->getCastKind())
4248	return false;
4249	E1 = ICE1->getSubExpr()->IgnoreParens();
4250	E2 = ICE2->getSubExpr()->IgnoreParens();
4251	// The final cast must be one of these types.
4252	if (ICE1->getCastKind() == CK_LValueToRValue ||
4253	ICE1->getCastKind() == CK_ArrayToPointerDecay ||
4254	ICE1->getCastKind() == CK_FunctionToPointerDecay) {
4255	break;
4256	}
4257	}
4258
4259	const auto *DRE1 = dyn_cast<DeclRefExpr>(Val: E1);
4260	const auto *DRE2 = dyn_cast<DeclRefExpr>(Val: E2);
4261	if (DRE1 && DRE2)
4262	return declaresSameEntity(DRE1->getDecl(), DRE2->getDecl());
4263
4264	const auto *Ivar1 = dyn_cast<ObjCIvarRefExpr>(Val: E1);
4265	const auto *Ivar2 = dyn_cast<ObjCIvarRefExpr>(Val: E2);
4266	if (Ivar1 && Ivar2) {
4267	return Ivar1->isFreeIvar() && Ivar2->isFreeIvar() &&
4268	declaresSameEntity(Ivar1->getDecl(), Ivar2->getDecl());
4269	}
4270
4271	const auto *Array1 = dyn_cast<ArraySubscriptExpr>(Val: E1);
4272	const auto *Array2 = dyn_cast<ArraySubscriptExpr>(Val: E2);
4273	if (Array1 && Array2) {
4274	if (!isSameComparisonOperand(E1: Array1->getBase(), E2: Array2->getBase()))
4275	return false;
4276
4277	auto Idx1 = Array1->getIdx();
4278	auto Idx2 = Array2->getIdx();
4279	const auto Integer1 = dyn_cast<IntegerLiteral>(Val: Idx1);
4280	const auto Integer2 = dyn_cast<IntegerLiteral>(Val: Idx2);
4281	if (Integer1 && Integer2) {
4282	if (!llvm::APInt::isSameValue(I1: Integer1->getValue(),
4283	I2: Integer2->getValue()))
4284	return false;
4285	} else {
4286	if (!isSameComparisonOperand(E1: Idx1, E2: Idx2))
4287	return false;
4288	}
4289
4290	return true;
4291	}
4292
4293	// Walk the MemberExpr chain.
4294	while (isa<MemberExpr>(Val: E1) && isa<MemberExpr>(Val: E2)) {
4295	const auto *ME1 = cast<MemberExpr>(Val: E1);
4296	const auto *ME2 = cast<MemberExpr>(Val: E2);
4297	if (!declaresSameEntity(ME1->getMemberDecl(), ME2->getMemberDecl()))
4298	return false;
4299	if (const auto *D = dyn_cast<VarDecl>(Val: ME1->getMemberDecl()))
4300	if (D->isStaticDataMember())
4301	return true;
4302	E1 = ME1->getBase()->IgnoreParenImpCasts();
4303	E2 = ME2->getBase()->IgnoreParenImpCasts();
4304	}
4305
4306	if (isa<CXXThisExpr>(Val: E1) && isa<CXXThisExpr>(Val: E2))
4307	return true;
4308
4309	// A static member variable can end the MemberExpr chain with either
4310	// a MemberExpr or a DeclRefExpr.
4311	auto getAnyDecl = [](const Expr *E) -> const ValueDecl * {
4312	if (const auto *DRE = dyn_cast<DeclRefExpr>(Val: E))
4313	return DRE->getDecl();
4314	if (const auto *ME = dyn_cast<MemberExpr>(Val: E))
4315	return ME->getMemberDecl();
4316	return nullptr;
4317	};
4318
4319	const ValueDecl *VD1 = getAnyDecl(E1);
4320	const ValueDecl *VD2 = getAnyDecl(E2);
4321	return declaresSameEntity(VD1, VD2);
4322	}
4323	}
4324	}
4325
4326	/// isArrow - Return true if the base expression is a pointer to vector,
4327	/// return false if the base expression is a vector.
4328	bool ExtVectorElementExpr::isArrow() const {
4329	return getBase()->getType()->isPointerType();
4330	}
4331
4332	unsigned ExtVectorElementExpr::getNumElements() const {
4333	if (const VectorType *VT = getType()->getAs<VectorType>())
4334	return VT->getNumElements();
4335	return 1;
4336	}
4337
4338	/// containsDuplicateElements - Return true if any element access is repeated.
4339	bool ExtVectorElementExpr::containsDuplicateElements() const {
4340	// FIXME: Refactor this code to an accessor on the AST node which returns the
4341	// "type" of component access, and share with code below and in Sema.
4342	StringRef Comp = Accessor->getName();
4343
4344	// Halving swizzles do not contain duplicate elements.
4345	if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd")
4346	return false;
4347
4348	// Advance past s-char prefix on hex swizzles.
4349	if (Comp[0] == 's' || Comp[0] == 'S')
4350	Comp = Comp.substr(Start: 1);
4351
4352	for (unsigned i = 0, e = Comp.size(); i != e; ++i)
4353	if (Comp.substr(Start: i + 1).contains(C: Comp[i]))
4354	return true;
4355
4356	return false;
4357	}
4358
4359	/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray.
4360	void ExtVectorElementExpr::getEncodedElementAccess(
4361	SmallVectorImpl<uint32_t> &Elts) const {
4362	StringRef Comp = Accessor->getName();
4363	bool isNumericAccessor = false;
4364	if (Comp[0] == 's' || Comp[0] == 'S') {
4365	Comp = Comp.substr(Start: 1);
4366	isNumericAccessor = true;
4367	}
4368
4369	bool isHi = Comp == "hi";
4370	bool isLo = Comp == "lo";
4371	bool isEven = Comp == "even";
4372	bool isOdd = Comp == "odd";
4373
4374	for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
4375	uint64_t Index;
4376
4377	if (isHi)
4378	Index = e + i;
4379	else if (isLo)
4380	Index = i;
4381	else if (isEven)
4382	Index = 2 * i;
4383	else if (isOdd)
4384	Index = 2 * i + 1;
4385	else
4386	Index = ExtVectorType::getAccessorIdx(c: Comp[i], isNumericAccessor);
4387
4388	Elts.push_back(Elt: Index);
4389	}
4390	}
4391
4392	ShuffleVectorExpr::ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr *> args,
4393	QualType Type, SourceLocation BLoc,
4394	SourceLocation RP)
4395	: Expr(ShuffleVectorExprClass, Type, VK_PRValue, OK_Ordinary),
4396	BuiltinLoc(BLoc), RParenLoc(RP) {
4397	ShuffleVectorExprBits.NumExprs = args.size();
4398	SubExprs = new (C) Stmt*[args.size()];
4399	for (unsigned i = 0; i != args.size(); i++)
4400	SubExprs[i] = args[i];
4401
4402	setDependence(computeDependence(E: this));
4403	}
4404
4405	void ShuffleVectorExpr::setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs) {
4406	if (SubExprs) C.Deallocate(Ptr: SubExprs);
4407
4408	this->ShuffleVectorExprBits.NumExprs = Exprs.size();
4409	SubExprs = new (C) Stmt *[ShuffleVectorExprBits.NumExprs];
4410	memcpy(dest: SubExprs, src: Exprs.data(), n: sizeof(Expr *) * Exprs.size());
4411	}
4412
4413	GenericSelectionExpr::GenericSelectionExpr(
4414	const ASTContext &, SourceLocation GenericLoc, Expr *ControllingExpr,
4415	ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4416	SourceLocation DefaultLoc, SourceLocation RParenLoc,
4417	bool ContainsUnexpandedParameterPack, unsigned ResultIndex)
4418	: Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4419	AssocExprs[ResultIndex]->getValueKind(),
4420	AssocExprs[ResultIndex]->getObjectKind()),
4421	NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4422	IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4423	assert(AssocTypes.size() == AssocExprs.size() &&
4424	"Must have the same number of association expressions"
4425	" and TypeSourceInfo!");
4426	assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4427
4428	GenericSelectionExprBits.GenericLoc = GenericLoc;
4429	getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4430	ControllingExpr;
4431	llvm::copy(AssocExprs,
4432	getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4433	llvm::copy(AssocTypes, getTrailingObjects<TypeSourceInfo *>() +
4434	getIndexOfStartOfAssociatedTypes());
4435
4436	setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4437	}
4438
4439	GenericSelectionExpr::GenericSelectionExpr(
4440	const ASTContext &, SourceLocation GenericLoc,
4441	TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4442	ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4443	SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4444	unsigned ResultIndex)
4445	: Expr(GenericSelectionExprClass, AssocExprs[ResultIndex]->getType(),
4446	AssocExprs[ResultIndex]->getValueKind(),
4447	AssocExprs[ResultIndex]->getObjectKind()),
4448	NumAssocs(AssocExprs.size()), ResultIndex(ResultIndex),
4449	IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4450	assert(AssocTypes.size() == AssocExprs.size() &&
4451	"Must have the same number of association expressions"
4452	" and TypeSourceInfo!");
4453	assert(ResultIndex < NumAssocs && "ResultIndex is out-of-bounds!");
4454
4455	GenericSelectionExprBits.GenericLoc = GenericLoc;
4456	getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4457	ControllingType;
4458	llvm::copy(AssocExprs,
4459	getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4460	llvm::copy(AssocTypes, getTrailingObjects<TypeSourceInfo *>() +
4461	getIndexOfStartOfAssociatedTypes());
4462
4463	setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4464	}
4465
4466	GenericSelectionExpr::GenericSelectionExpr(
4467	const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4468	ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4469	SourceLocation DefaultLoc, SourceLocation RParenLoc,
4470	bool ContainsUnexpandedParameterPack)
4471	: Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4472	OK_Ordinary),
4473	NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4474	IsExprPredicate(true), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4475	assert(AssocTypes.size() == AssocExprs.size() &&
4476	"Must have the same number of association expressions"
4477	" and TypeSourceInfo!");
4478
4479	GenericSelectionExprBits.GenericLoc = GenericLoc;
4480	getTrailingObjects<Stmt *>()[getIndexOfControllingExpression()] =
4481	ControllingExpr;
4482	llvm::copy(AssocExprs,
4483	getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4484	llvm::copy(AssocTypes, getTrailingObjects<TypeSourceInfo *>() +
4485	getIndexOfStartOfAssociatedTypes());
4486
4487	setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4488	}
4489
4490	GenericSelectionExpr::GenericSelectionExpr(
4491	const ASTContext &Context, SourceLocation GenericLoc,
4492	TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4493	ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4494	SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack)
4495	: Expr(GenericSelectionExprClass, Context.DependentTy, VK_PRValue,
4496	OK_Ordinary),
4497	NumAssocs(AssocExprs.size()), ResultIndex(ResultDependentIndex),
4498	IsExprPredicate(false), DefaultLoc(DefaultLoc), RParenLoc(RParenLoc) {
4499	assert(AssocTypes.size() == AssocExprs.size() &&
4500	"Must have the same number of association expressions"
4501	" and TypeSourceInfo!");
4502
4503	GenericSelectionExprBits.GenericLoc = GenericLoc;
4504	getTrailingObjects<TypeSourceInfo *>()[getIndexOfControllingType()] =
4505	ControllingType;
4506	llvm::copy(AssocExprs,
4507	getTrailingObjects<Stmt *>() + getIndexOfStartOfAssociatedExprs());
4508	llvm::copy(AssocTypes, getTrailingObjects<TypeSourceInfo *>() +
4509	getIndexOfStartOfAssociatedTypes());
4510
4511	setDependence(computeDependence(E: this, ContainsUnexpandedPack: ContainsUnexpandedParameterPack));
4512	}
4513
4514	GenericSelectionExpr::GenericSelectionExpr(EmptyShell Empty, unsigned NumAssocs)
4515	: Expr(GenericSelectionExprClass, Empty), NumAssocs(NumAssocs) {}
4516
4517	GenericSelectionExpr *GenericSelectionExpr::Create(
4518	const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4519	ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4520	SourceLocation DefaultLoc, SourceLocation RParenLoc,
4521	bool ContainsUnexpandedParameterPack, unsigned ResultIndex) {
4522	unsigned NumAssocs = AssocExprs.size();
4523	void *Mem = Context.Allocate(
4524	Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4525	Align: alignof(GenericSelectionExpr));
4526	return new (Mem) GenericSelectionExpr(
4527	Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4528	RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4529	}
4530
4531	GenericSelectionExpr *GenericSelectionExpr::Create(
4532	const ASTContext &Context, SourceLocation GenericLoc, Expr *ControllingExpr,
4533	ArrayRef<TypeSourceInfo *> AssocTypes, ArrayRef<Expr *> AssocExprs,
4534	SourceLocation DefaultLoc, SourceLocation RParenLoc,
4535	bool ContainsUnexpandedParameterPack) {
4536	unsigned NumAssocs = AssocExprs.size();
4537	void *Mem = Context.Allocate(
4538	Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4539	Align: alignof(GenericSelectionExpr));
4540	return new (Mem) GenericSelectionExpr(
4541	Context, GenericLoc, ControllingExpr, AssocTypes, AssocExprs, DefaultLoc,
4542	RParenLoc, ContainsUnexpandedParameterPack);
4543	}
4544
4545	GenericSelectionExpr *GenericSelectionExpr::Create(
4546	const ASTContext &Context, SourceLocation GenericLoc,
4547	TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4548	ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4549	SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack,
4550	unsigned ResultIndex) {
4551	unsigned NumAssocs = AssocExprs.size();
4552	void *Mem = Context.Allocate(
4553	Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4554	Align: alignof(GenericSelectionExpr));
4555	return new (Mem) GenericSelectionExpr(
4556	Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4557	RParenLoc, ContainsUnexpandedParameterPack, ResultIndex);
4558	}
4559
4560	GenericSelectionExpr *GenericSelectionExpr::Create(
4561	const ASTContext &Context, SourceLocation GenericLoc,
4562	TypeSourceInfo *ControllingType, ArrayRef<TypeSourceInfo *> AssocTypes,
4563	ArrayRef<Expr *> AssocExprs, SourceLocation DefaultLoc,
4564	SourceLocation RParenLoc, bool ContainsUnexpandedParameterPack) {
4565	unsigned NumAssocs = AssocExprs.size();
4566	void *Mem = Context.Allocate(
4567	Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4568	Align: alignof(GenericSelectionExpr));
4569	return new (Mem) GenericSelectionExpr(
4570	Context, GenericLoc, ControllingType, AssocTypes, AssocExprs, DefaultLoc,
4571	RParenLoc, ContainsUnexpandedParameterPack);
4572	}
4573
4574	GenericSelectionExpr *
4575	GenericSelectionExpr::CreateEmpty(const ASTContext &Context,
4576	unsigned NumAssocs) {
4577	void *Mem = Context.Allocate(
4578	Size: totalSizeToAlloc<Stmt *, TypeSourceInfo *>(Counts: 1 + NumAssocs, Counts: NumAssocs),
4579	Align: alignof(GenericSelectionExpr));
4580	return new (Mem) GenericSelectionExpr(EmptyShell(), NumAssocs);
4581	}
4582
4583	//===----------------------------------------------------------------------===//
4584	// DesignatedInitExpr
4585	//===----------------------------------------------------------------------===//
4586
4587	const IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
4588	assert(isFieldDesignator() && "Only valid on a field designator");
4589	if (FieldInfo.NameOrField & 0x01)
4590	return reinterpret_cast<IdentifierInfo *>(FieldInfo.NameOrField & ~0x01);
4591	return getFieldDecl()->getIdentifier();
4592	}
4593
4594	DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
4595	llvm::ArrayRef<Designator> Designators,
4596	SourceLocation EqualOrColonLoc,
4597	bool GNUSyntax,
4598	ArrayRef<Expr *> IndexExprs, Expr *Init)
4599	: Expr(DesignatedInitExprClass, Ty, Init->getValueKind(),
4600	Init->getObjectKind()),
4601	EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
4602	NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
4603	this->Designators = new (C) Designator[NumDesignators];
4604
4605	// Record the initializer itself.
4606	child_iterator Child = child_begin();
4607	*Child++ = Init;
4608
4609	// Copy the designators and their subexpressions, computing
4610	// value-dependence along the way.
4611	unsigned IndexIdx = 0;
4612	for (unsigned I = 0; I != NumDesignators; ++I) {
4613	this->Designators[I] = Designators[I];
4614	if (this->Designators[I].isArrayDesignator()) {
4615	// Copy the index expressions into permanent storage.
4616	*Child++ = IndexExprs[IndexIdx++];
4617	} else if (this->Designators[I].isArrayRangeDesignator()) {
4618	// Copy the start/end expressions into permanent storage.
4619	*Child++ = IndexExprs[IndexIdx++];
4620	*Child++ = IndexExprs[IndexIdx++];
4621	}
4622	}
4623
4624	assert(IndexIdx == IndexExprs.size() && "Wrong number of index expressions");
4625	setDependence(computeDependence(E: this));
4626	}
4627
4628	DesignatedInitExpr *
4629	DesignatedInitExpr::Create(const ASTContext &C,
4630	llvm::ArrayRef<Designator> Designators,
4631	ArrayRef<Expr*> IndexExprs,
4632	SourceLocation ColonOrEqualLoc,
4633	bool UsesColonSyntax, Expr *Init) {
4634	void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: IndexExprs.size() + 1),
4635	Align: alignof(DesignatedInitExpr));
4636	return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
4637	ColonOrEqualLoc, UsesColonSyntax,
4638	IndexExprs, Init);
4639	}
4640
4641	DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(const ASTContext &C,
4642	unsigned NumIndexExprs) {
4643	void *Mem = C.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumIndexExprs + 1),
4644	Align: alignof(DesignatedInitExpr));
4645	return new (Mem) DesignatedInitExpr(NumIndexExprs + 1);
4646	}
4647
4648	void DesignatedInitExpr::setDesignators(const ASTContext &C,
4649	const Designator *Desigs,
4650	unsigned NumDesigs) {
4651	Designators = new (C) Designator[NumDesigs];
4652	NumDesignators = NumDesigs;
4653	for (unsigned I = 0; I != NumDesigs; ++I)
4654	Designators[I] = Desigs[I];
4655	}
4656
4657	SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
4658	DesignatedInitExpr *DIE = const_cast<DesignatedInitExpr*>(this);
4659	if (size() == 1)
4660	return DIE->getDesignator(Idx: 0)->getSourceRange();
4661	return SourceRange(DIE->getDesignator(Idx: 0)->getBeginLoc(),
4662	DIE->getDesignator(Idx: size() - 1)->getEndLoc());
4663	}
4664
4665	SourceLocation DesignatedInitExpr::getBeginLoc() const {
4666	auto *DIE = const_cast<DesignatedInitExpr *>(this);
4667	Designator &First = *DIE->getDesignator(Idx: 0);
4668	if (First.isFieldDesignator()) {
4669	// Skip past implicit designators for anonymous structs/unions, since
4670	// these do not have valid source locations.
4671	for (unsigned int i = 0; i < DIE->size(); i++) {
4672	Designator &Des = *DIE->getDesignator(Idx: i);
4673	SourceLocation retval = GNUSyntax ? Des.getFieldLoc() : Des.getDotLoc();
4674	if (!retval.isValid())
4675	continue;
4676	return retval;
4677	}
4678	}
4679	return First.getLBracketLoc();
4680	}
4681
4682	SourceLocation DesignatedInitExpr::getEndLoc() const {
4683	return getInit()->getEndLoc();
4684	}
4685
4686	Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) const {
4687	assert(D.isArrayDesignator() && "Requires array designator");
4688	return getSubExpr(Idx: D.getArrayIndex() + 1);
4689	}
4690
4691	Expr *DesignatedInitExpr::getArrayRangeStart(const Designator &D) const {
4692	assert(D.isArrayRangeDesignator() && "Requires array range designator");
4693	return getSubExpr(Idx: D.getArrayIndex() + 1);
4694	}
4695
4696	Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator &D) const {
4697	assert(D.isArrayRangeDesignator() && "Requires array range designator");
4698	return getSubExpr(Idx: D.getArrayIndex() + 2);
4699	}
4700
4701	/// Replaces the designator at index @p Idx with the series
4702	/// of designators in [First, Last).
4703	void DesignatedInitExpr::ExpandDesignator(const ASTContext &C, unsigned Idx,
4704	const Designator *First,
4705	const Designator *Last) {
4706	unsigned NumNewDesignators = Last - First;
4707	if (NumNewDesignators == 0) {
4708	std::copy_backward(first: Designators + Idx + 1,
4709	last: Designators + NumDesignators,
4710	result: Designators + Idx);
4711	--NumNewDesignators;
4712	return;
4713	}
4714	if (NumNewDesignators == 1) {
4715	Designators[Idx] = *First;
4716	return;
4717	}
4718
4719	Designator *NewDesignators
4720	= new (C) Designator[NumDesignators - 1 + NumNewDesignators];
4721	std::copy(first: Designators, last: Designators + Idx, result: NewDesignators);
4722	std::copy(first: First, last: Last, result: NewDesignators + Idx);
4723	std::copy(first: Designators + Idx + 1, last: Designators + NumDesignators,
4724	result: NewDesignators + Idx + NumNewDesignators);
4725	Designators = NewDesignators;
4726	NumDesignators = NumDesignators - 1 + NumNewDesignators;
4727	}
4728
4729	DesignatedInitUpdateExpr::DesignatedInitUpdateExpr(const ASTContext &C,
4730	SourceLocation lBraceLoc,
4731	Expr *baseExpr,
4732	SourceLocation rBraceLoc)
4733	: Expr(DesignatedInitUpdateExprClass, baseExpr->getType(), VK_PRValue,
4734	OK_Ordinary) {
4735	BaseAndUpdaterExprs[0] = baseExpr;
4736
4737	InitListExpr *ILE = new (C) InitListExpr(C, lBraceLoc, {}, rBraceLoc);
4738	ILE->setType(baseExpr->getType());
4739	BaseAndUpdaterExprs[1] = ILE;
4740
4741	// FIXME: this is wrong, set it correctly.
4742	setDependence(ExprDependence::None);
4743	}
4744
4745	SourceLocation DesignatedInitUpdateExpr::getBeginLoc() const {
4746	return getBase()->getBeginLoc();
4747	}
4748
4749	SourceLocation DesignatedInitUpdateExpr::getEndLoc() const {
4750	return getBase()->getEndLoc();
4751	}
4752
4753	ParenListExpr::ParenListExpr(SourceLocation LParenLoc, ArrayRef<Expr *> Exprs,
4754	SourceLocation RParenLoc)
4755	: Expr(ParenListExprClass, QualType(), VK_PRValue, OK_Ordinary),
4756	LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
4757	ParenListExprBits.NumExprs = Exprs.size();
4758	llvm::copy(Exprs, getTrailingObjects());
4759	setDependence(computeDependence(E: this));
4760	}
4761
4762	ParenListExpr::ParenListExpr(EmptyShell Empty, unsigned NumExprs)
4763	: Expr(ParenListExprClass, Empty) {
4764	ParenListExprBits.NumExprs = NumExprs;
4765	}
4766
4767	ParenListExpr *ParenListExpr::Create(const ASTContext &Ctx,
4768	SourceLocation LParenLoc,
4769	ArrayRef<Expr *> Exprs,
4770	SourceLocation RParenLoc) {
4771	void *Mem = Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: Exprs.size()),
4772	Align: alignof(ParenListExpr));
4773	return new (Mem) ParenListExpr(LParenLoc, Exprs, RParenLoc);
4774	}
4775
4776	ParenListExpr *ParenListExpr::CreateEmpty(const ASTContext &Ctx,
4777	unsigned NumExprs) {
4778	void *Mem =
4779	Ctx.Allocate(Size: totalSizeToAlloc<Stmt *>(Counts: NumExprs), Align: alignof(ParenListExpr));
4780	return new (Mem) ParenListExpr(EmptyShell(), NumExprs);
4781	}
4782
4783	/// Certain overflow-dependent code patterns can have their integer overflow
4784	/// sanitization disabled. Check for the common pattern `if (a + b < a)` and
4785	/// return the resulting BinaryOperator responsible for the addition so we can
4786	/// elide overflow checks during codegen.
4787	static std::optional<BinaryOperator *>
4788	getOverflowPatternBinOp(const BinaryOperator *E) {
4789	Expr *Addition, *ComparedTo;
4790	if (E->getOpcode() == BO_LT) {
4791	Addition = E->getLHS();
4792	ComparedTo = E->getRHS();
4793	} else if (E->getOpcode() == BO_GT) {
4794	Addition = E->getRHS();
4795	ComparedTo = E->getLHS();
4796	} else {
4797	return {};
4798	}
4799
4800	const Expr *AddLHS = nullptr, *AddRHS = nullptr;
4801	BinaryOperator *BO = dyn_cast<BinaryOperator>(Val: Addition);
4802
4803	if (BO && BO->getOpcode() == clang::BO_Add) {
4804	// now store addends for lookup on other side of '>'
4805	AddLHS = BO->getLHS();
4806	AddRHS = BO->getRHS();
4807	}
4808
4809	if (!AddLHS || !AddRHS)
4810	return {};
4811
4812	const Decl *LHSDecl, *RHSDecl, *OtherDecl;
4813
4814	LHSDecl = AddLHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
4815	RHSDecl = AddRHS->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
4816	OtherDecl = ComparedTo->IgnoreParenImpCasts()->getReferencedDeclOfCallee();
4817
4818	if (!OtherDecl)
4819	return {};
4820
4821	if (!LHSDecl && !RHSDecl)
4822	return {};
4823
4824	if ((LHSDecl && LHSDecl == OtherDecl && LHSDecl != RHSDecl) ||
4825	(RHSDecl && RHSDecl == OtherDecl && RHSDecl != LHSDecl))
4826	return BO;
4827	return {};
4828	}
4829
4830	/// Compute and set the OverflowPatternExclusion bit based on whether the
4831	/// BinaryOperator expression matches an overflow pattern being ignored by
4832	/// -fsanitize-undefined-ignore-overflow-pattern=add-signed-overflow-test or
4833	/// -fsanitize-undefined-ignore-overflow-pattern=add-unsigned-overflow-test
4834	static void computeOverflowPatternExclusion(const ASTContext &Ctx,
4835	const BinaryOperator *E) {
4836	std::optional<BinaryOperator *> Result = getOverflowPatternBinOp(E);
4837	if (!Result.has_value())
4838	return;
4839	QualType AdditionResultType = Result.value()->getType();
4840
4841	if ((AdditionResultType->isSignedIntegerType() &&
4842	Ctx.getLangOpts().isOverflowPatternExcluded(
4843	Kind: LangOptions::OverflowPatternExclusionKind::AddSignedOverflowTest)) ||
4844	(AdditionResultType->isUnsignedIntegerType() &&
4845	Ctx.getLangOpts().isOverflowPatternExcluded(
4846	Kind: LangOptions::OverflowPatternExclusionKind::AddUnsignedOverflowTest)))
4847	Result.value()->setExcludedOverflowPattern(true);
4848	}
4849
4850	BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
4851	Opcode opc, QualType ResTy, ExprValueKind VK,
4852	ExprObjectKind OK, SourceLocation opLoc,
4853	FPOptionsOverride FPFeatures)
4854	: Expr(BinaryOperatorClass, ResTy, VK, OK) {
4855	BinaryOperatorBits.Opc = opc;
4856	assert(!isCompoundAssignmentOp() &&
4857	"Use CompoundAssignOperator for compound assignments");
4858	BinaryOperatorBits.OpLoc = opLoc;
4859	BinaryOperatorBits.ExcludedOverflowPattern = false;
4860	SubExprs[LHS] = lhs;
4861	SubExprs[RHS] = rhs;
4862	computeOverflowPatternExclusion(Ctx, E: this);
4863	BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
4864	if (hasStoredFPFeatures())
4865	setStoredFPFeatures(FPFeatures);
4866	setDependence(computeDependence(E: this));
4867	}
4868
4869	BinaryOperator::BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs,
4870	Opcode opc, QualType ResTy, ExprValueKind VK,
4871	ExprObjectKind OK, SourceLocation opLoc,
4872	FPOptionsOverride FPFeatures, bool dead2)
4873	: Expr(CompoundAssignOperatorClass, ResTy, VK, OK) {
4874	BinaryOperatorBits.Opc = opc;
4875	BinaryOperatorBits.ExcludedOverflowPattern = false;
4876	assert(isCompoundAssignmentOp() &&
4877	"Use CompoundAssignOperator for compound assignments");
4878	BinaryOperatorBits.OpLoc = opLoc;
4879	SubExprs[LHS] = lhs;
4880	SubExprs[RHS] = rhs;
4881	BinaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
4882	if (hasStoredFPFeatures())
4883	setStoredFPFeatures(FPFeatures);
4884	setDependence(computeDependence(E: this));
4885	}
4886
4887	BinaryOperator *BinaryOperator::CreateEmpty(const ASTContext &C,
4888	bool HasFPFeatures) {
4889	unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
4890	void *Mem =
4891	C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
4892	return new (Mem) BinaryOperator(EmptyShell());
4893	}
4894
4895	BinaryOperator *BinaryOperator::Create(const ASTContext &C, Expr *lhs,
4896	Expr *rhs, Opcode opc, QualType ResTy,
4897	ExprValueKind VK, ExprObjectKind OK,
4898	SourceLocation opLoc,
4899	FPOptionsOverride FPFeatures) {
4900	bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
4901	unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
4902	void *Mem =
4903	C.Allocate(Size: sizeof(BinaryOperator) + Extra, Align: alignof(BinaryOperator));
4904	return new (Mem)
4905	BinaryOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures);
4906	}
4907
4908	CompoundAssignOperator *
4909	CompoundAssignOperator::CreateEmpty(const ASTContext &C, bool HasFPFeatures) {
4910	unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
4911	void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
4912	Align: alignof(CompoundAssignOperator));
4913	return new (Mem) CompoundAssignOperator(C, EmptyShell(), HasFPFeatures);
4914	}
4915
4916	CompoundAssignOperator *
4917	CompoundAssignOperator::Create(const ASTContext &C, Expr *lhs, Expr *rhs,
4918	Opcode opc, QualType ResTy, ExprValueKind VK,
4919	ExprObjectKind OK, SourceLocation opLoc,
4920	FPOptionsOverride FPFeatures,
4921	QualType CompLHSType, QualType CompResultType) {
4922	bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
4923	unsigned Extra = sizeOfTrailingObjects(HasFPFeatures);
4924	void *Mem = C.Allocate(Size: sizeof(CompoundAssignOperator) + Extra,
4925	Align: alignof(CompoundAssignOperator));
4926	return new (Mem)
4927	CompoundAssignOperator(C, lhs, rhs, opc, ResTy, VK, OK, opLoc, FPFeatures,
4928	CompLHSType, CompResultType);
4929	}
4930
4931	UnaryOperator *UnaryOperator::CreateEmpty(const ASTContext &C,
4932	bool hasFPFeatures) {
4933	void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
4934	Align: alignof(UnaryOperator));
4935	return new (Mem) UnaryOperator(hasFPFeatures, EmptyShell());
4936	}
4937
4938	UnaryOperator::UnaryOperator(const ASTContext &Ctx, Expr *input, Opcode opc,
4939	QualType type, ExprValueKind VK, ExprObjectKind OK,
4940	SourceLocation l, bool CanOverflow,
4941	FPOptionsOverride FPFeatures)
4942	: Expr(UnaryOperatorClass, type, VK, OK), Val(input) {
4943	UnaryOperatorBits.Opc = opc;
4944	UnaryOperatorBits.CanOverflow = CanOverflow;
4945	UnaryOperatorBits.Loc = l;
4946	UnaryOperatorBits.HasFPFeatures = FPFeatures.requiresTrailingStorage();
4947	if (hasStoredFPFeatures())
4948	setStoredFPFeatures(FPFeatures);
4949	setDependence(computeDependence(E: this, Ctx));
4950	}
4951
4952	UnaryOperator *UnaryOperator::Create(const ASTContext &C, Expr *input,
4953	Opcode opc, QualType type,
4954	ExprValueKind VK, ExprObjectKind OK,
4955	SourceLocation l, bool CanOverflow,
4956	FPOptionsOverride FPFeatures) {
4957	bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
4958	unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
4959	void *Mem = C.Allocate(Size, Align: alignof(UnaryOperator));
4960	return new (Mem)
4961	UnaryOperator(C, input, opc, type, VK, OK, l, CanOverflow, FPFeatures);
4962	}
4963
4964	const OpaqueValueExpr *OpaqueValueExpr::findInCopyConstruct(const Expr *e) {
4965	if (const ExprWithCleanups *ewc = dyn_cast<ExprWithCleanups>(Val: e))
4966	e = ewc->getSubExpr();
4967	if (const MaterializeTemporaryExpr *m = dyn_cast<MaterializeTemporaryExpr>(Val: e))
4968	e = m->getSubExpr();
4969	e = cast<CXXConstructExpr>(Val: e)->getArg(Arg: 0);
4970	while (const ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(Val: e))
4971	e = ice->getSubExpr();
4972	return cast<OpaqueValueExpr>(Val: e);
4973	}
4974
4975	PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &Context,
4976	EmptyShell sh,
4977	unsigned numSemanticExprs) {
4978	void *buffer =
4979	Context.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: 1 + numSemanticExprs),
4980	Align: alignof(PseudoObjectExpr));
4981	return new(buffer) PseudoObjectExpr(sh, numSemanticExprs);
4982	}
4983
4984	PseudoObjectExpr::PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs)
4985	: Expr(PseudoObjectExprClass, shell) {
4986	PseudoObjectExprBits.NumSubExprs = numSemanticExprs + 1;
4987	}
4988
4989	PseudoObjectExpr *PseudoObjectExpr::Create(const ASTContext &C, Expr *syntax,
4990	ArrayRef<Expr*> semantics,
4991	unsigned resultIndex) {
4992	assert(syntax && "no syntactic expression!");
4993	assert(semantics.size() && "no semantic expressions!");
4994
4995	QualType type;
4996	ExprValueKind VK;
4997	if (resultIndex == NoResult) {
4998	type = C.VoidTy;
4999	VK = VK_PRValue;
5000	} else {
5001	assert(resultIndex < semantics.size());
5002	type = semantics[resultIndex]->getType();
5003	VK = semantics[resultIndex]->getValueKind();
5004	assert(semantics[resultIndex]->getObjectKind() == OK_Ordinary);
5005	}
5006
5007	void *buffer = C.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: semantics.size() + 1),
5008	Align: alignof(PseudoObjectExpr));
5009	return new(buffer) PseudoObjectExpr(type, VK, syntax, semantics,
5010	resultIndex);
5011	}
5012
5013	PseudoObjectExpr::PseudoObjectExpr(QualType type, ExprValueKind VK,
5014	Expr *syntax, ArrayRef<Expr *> semantics,
5015	unsigned resultIndex)
5016	: Expr(PseudoObjectExprClass, type, VK, OK_Ordinary) {
5017	PseudoObjectExprBits.NumSubExprs = semantics.size() + 1;
5018	PseudoObjectExprBits.ResultIndex = resultIndex + 1;
5019	MutableArrayRef<Expr *> Trail = getTrailingObjects(semantics.size() + 1);
5020	Trail[0] = syntax;
5021
5022	assert(llvm::all_of(semantics,
5023	[](const Expr *E) {
5024	return !isa<OpaqueValueExpr>(E) ||
5025	cast<OpaqueValueExpr>(E)->getSourceExpr() !=
5026	nullptr;
5027	}) &&
5028	"opaque-value semantic expressions for pseudo-object "
5029	"operations must have sources");
5030
5031	llvm::copy(Range&: semantics, Out: Trail.drop_front().begin());
5032	setDependence(computeDependence(E: this));
5033	}
5034
5035	//===----------------------------------------------------------------------===//
5036	// Child Iterators for iterating over subexpressions/substatements
5037	//===----------------------------------------------------------------------===//
5038
5039	// UnaryExprOrTypeTraitExpr
5040	Stmt::child_range UnaryExprOrTypeTraitExpr::children() {
5041	const_child_range CCR =
5042	const_cast<const UnaryExprOrTypeTraitExpr *>(this)->children();
5043	return child_range(cast_away_const(RHS: CCR.begin()), cast_away_const(RHS: CCR.end()));
5044	}
5045
5046	Stmt::const_child_range UnaryExprOrTypeTraitExpr::children() const {
5047	// If this is of a type and the type is a VLA type (and not a typedef), the
5048	// size expression of the VLA needs to be treated as an executable expression.
5049	// Why isn't this weirdness documented better in StmtIterator?
5050	if (isArgumentType()) {
5051	if (const VariableArrayType *T =
5052	dyn_cast<VariableArrayType>(Val: getArgumentType().getTypePtr()))
5053	return const_child_range(const_child_iterator(T), const_child_iterator());
5054	return const_child_range(const_child_iterator(), const_child_iterator());
5055	}
5056	return const_child_range(&Argument.Ex, &Argument.Ex + 1);
5057	}
5058
5059	AtomicExpr::AtomicExpr(SourceLocation BLoc, ArrayRef<Expr *> args, QualType t,
5060	AtomicOp op, SourceLocation RP)
5061	: Expr(AtomicExprClass, t, VK_PRValue, OK_Ordinary),
5062	NumSubExprs(args.size()), BuiltinLoc(BLoc), RParenLoc(RP), Op(op) {
5063	assert(args.size() == getNumSubExprs(op) && "wrong number of subexpressions");
5064	for (unsigned i = 0; i != args.size(); i++)
5065	SubExprs[i] = args[i];
5066	setDependence(computeDependence(E: this));
5067	}
5068
5069	unsigned AtomicExpr::getNumSubExprs(AtomicOp Op) {
5070	switch (Op) {
5071	case AO__c11_atomic_init:
5072	case AO__opencl_atomic_init:
5073	case AO__c11_atomic_load:
5074	case AO__atomic_load_n:
5075	case AO__atomic_test_and_set:
5076	case AO__atomic_clear:
5077	return 2;
5078
5079	case AO__scoped_atomic_load_n:
5080	case AO__opencl_atomic_load:
5081	case AO__hip_atomic_load:
5082	case AO__c11_atomic_store:
5083	case AO__c11_atomic_exchange:
5084	case AO__atomic_load:
5085	case AO__atomic_store:
5086	case AO__atomic_store_n:
5087	case AO__atomic_exchange_n:
5088	case AO__c11_atomic_fetch_add:
5089	case AO__c11_atomic_fetch_sub:
5090	case AO__c11_atomic_fetch_and:
5091	case AO__c11_atomic_fetch_or:
5092	case AO__c11_atomic_fetch_xor:
5093	case AO__c11_atomic_fetch_nand:
5094	case AO__c11_atomic_fetch_max:
5095	case AO__c11_atomic_fetch_min:
5096	case AO__atomic_fetch_add:
5097	case AO__atomic_fetch_sub:
5098	case AO__atomic_fetch_and:
5099	case AO__atomic_fetch_or:
5100	case AO__atomic_fetch_xor:
5101	case AO__atomic_fetch_nand:
5102	case AO__atomic_add_fetch:
5103	case AO__atomic_sub_fetch:
5104	case AO__atomic_and_fetch:
5105	case AO__atomic_or_fetch:
5106	case AO__atomic_xor_fetch:
5107	case AO__atomic_nand_fetch:
5108	case AO__atomic_min_fetch:
5109	case AO__atomic_max_fetch:
5110	case AO__atomic_fetch_min:
5111	case AO__atomic_fetch_max:
5112	return 3;
5113
5114	case AO__scoped_atomic_load:
5115	case AO__scoped_atomic_store:
5116	case AO__scoped_atomic_store_n:
5117	case AO__scoped_atomic_fetch_add:
5118	case AO__scoped_atomic_fetch_sub:
5119	case AO__scoped_atomic_fetch_and:
5120	case AO__scoped_atomic_fetch_or:
5121	case AO__scoped_atomic_fetch_xor:
5122	case AO__scoped_atomic_fetch_nand:
5123	case AO__scoped_atomic_add_fetch:
5124	case AO__scoped_atomic_sub_fetch:
5125	case AO__scoped_atomic_and_fetch:
5126	case AO__scoped_atomic_or_fetch:
5127	case AO__scoped_atomic_xor_fetch:
5128	case AO__scoped_atomic_nand_fetch:
5129	case AO__scoped_atomic_min_fetch:
5130	case AO__scoped_atomic_max_fetch:
5131	case AO__scoped_atomic_fetch_min:
5132	case AO__scoped_atomic_fetch_max:
5133	case AO__scoped_atomic_exchange_n:
5134	case AO__hip_atomic_exchange:
5135	case AO__hip_atomic_fetch_add:
5136	case AO__hip_atomic_fetch_sub:
5137	case AO__hip_atomic_fetch_and:
5138	case AO__hip_atomic_fetch_or:
5139	case AO__hip_atomic_fetch_xor:
5140	case AO__hip_atomic_fetch_min:
5141	case AO__hip_atomic_fetch_max:
5142	case AO__opencl_atomic_store:
5143	case AO__hip_atomic_store:
5144	case AO__opencl_atomic_exchange:
5145	case AO__opencl_atomic_fetch_add:
5146	case AO__opencl_atomic_fetch_sub:
5147	case AO__opencl_atomic_fetch_and:
5148	case AO__opencl_atomic_fetch_or:
5149	case AO__opencl_atomic_fetch_xor:
5150	case AO__opencl_atomic_fetch_min:
5151	case AO__opencl_atomic_fetch_max:
5152	case AO__atomic_exchange:
5153	return 4;
5154
5155	case AO__scoped_atomic_exchange:
5156	case AO__c11_atomic_compare_exchange_strong:
5157	case AO__c11_atomic_compare_exchange_weak:
5158	return 5;
5159	case AO__hip_atomic_compare_exchange_strong:
5160	case AO__opencl_atomic_compare_exchange_strong:
5161	case AO__opencl_atomic_compare_exchange_weak:
5162	case AO__hip_atomic_compare_exchange_weak:
5163	case AO__atomic_compare_exchange:
5164	case AO__atomic_compare_exchange_n:
5165	return 6;
5166
5167	case AO__scoped_atomic_compare_exchange:
5168	case AO__scoped_atomic_compare_exchange_n:
5169	return 7;
5170	}
5171	llvm_unreachable("unknown atomic op");
5172	}
5173
5174	QualType AtomicExpr::getValueType() const {
5175	auto T = getPtr()->getType()->castAs<PointerType>()->getPointeeType();
5176	if (auto AT = T->getAs<AtomicType>())
5177	return AT->getValueType();
5178	return T;
5179	}
5180
5181	QualType ArraySectionExpr::getBaseOriginalType(const Expr *Base) {
5182	unsigned ArraySectionCount = 0;
5183	while (auto *OASE = dyn_cast<ArraySectionExpr>(Val: Base->IgnoreParens())) {
5184	Base = OASE->getBase();
5185	++ArraySectionCount;
5186	}
5187	while (auto *ASE =
5188	dyn_cast<ArraySubscriptExpr>(Val: Base->IgnoreParenImpCasts())) {
5189	Base = ASE->getBase();
5190	++ArraySectionCount;
5191	}
5192	Base = Base->IgnoreParenImpCasts();
5193	auto OriginalTy = Base->getType();
5194	if (auto *DRE = dyn_cast<DeclRefExpr>(Val: Base))
5195	if (auto *PVD = dyn_cast<ParmVarDecl>(Val: DRE->getDecl()))
5196	OriginalTy = PVD->getOriginalType().getNonReferenceType();
5197
5198	for (unsigned Cnt = 0; Cnt < ArraySectionCount; ++Cnt) {
5199	if (OriginalTy->isAnyPointerType())
5200	OriginalTy = OriginalTy->getPointeeType();
5201	else if (OriginalTy->isArrayType())
5202	OriginalTy = OriginalTy->castAsArrayTypeUnsafe()->getElementType();
5203	else
5204	return {};
5205	}
5206	return OriginalTy;
5207	}
5208
5209	RecoveryExpr::RecoveryExpr(ASTContext &Ctx, QualType T, SourceLocation BeginLoc,
5210	SourceLocation EndLoc, ArrayRef<Expr *> SubExprs)
5211	: Expr(RecoveryExprClass, T.getNonReferenceType(),
5212	T->isDependentType() ? VK_LValue : getValueKindForType(T),
5213	OK_Ordinary),
5214	BeginLoc(BeginLoc), EndLoc(EndLoc), NumExprs(SubExprs.size()) {
5215	assert(!T.isNull());
5216	assert(!llvm::is_contained(SubExprs, nullptr));
5217
5218	llvm::copy(SubExprs, getTrailingObjects());
5219	setDependence(computeDependence(E: this));
5220	}
5221
5222	RecoveryExpr *RecoveryExpr::Create(ASTContext &Ctx, QualType T,
5223	SourceLocation BeginLoc,
5224	SourceLocation EndLoc,
5225	ArrayRef<Expr *> SubExprs) {
5226	void *Mem = Ctx.Allocate(totalSizeToAlloc<Expr *>(SubExprs.size()),
5227	alignof(RecoveryExpr));
5228	return new (Mem) RecoveryExpr(Ctx, T, BeginLoc, EndLoc, SubExprs);
5229	}
5230
5231	RecoveryExpr *RecoveryExpr::CreateEmpty(ASTContext &Ctx, unsigned NumSubExprs) {
5232	void *Mem = Ctx.Allocate(totalSizeToAlloc<Expr *>(NumSubExprs),
5233	alignof(RecoveryExpr));
5234	return new (Mem) RecoveryExpr(EmptyShell(), NumSubExprs);
5235	}
5236
5237	void OMPArrayShapingExpr::setDimensions(ArrayRef<Expr *> Dims) {
5238	assert(
5239	NumDims == Dims.size() &&
5240	"Preallocated number of dimensions is different from the provided one.");
5241	llvm::copy(Dims, getTrailingObjects<Expr *>());
5242	}
5243
5244	void OMPArrayShapingExpr::setBracketsRanges(ArrayRef<SourceRange> BR) {
5245	assert(
5246	NumDims == BR.size() &&
5247	"Preallocated number of dimensions is different from the provided one.");
5248	llvm::copy(BR, getTrailingObjects<SourceRange>());
5249	}
5250
5251	OMPArrayShapingExpr::OMPArrayShapingExpr(QualType ExprTy, Expr *Op,
5252	SourceLocation L, SourceLocation R,
5253	ArrayRef<Expr *> Dims)
5254	: Expr(OMPArrayShapingExprClass, ExprTy, VK_LValue, OK_Ordinary), LPLoc(L),
5255	RPLoc(R), NumDims(Dims.size()) {
5256	setBase(Op);
5257	setDimensions(Dims);
5258	setDependence(computeDependence(E: this));
5259	}
5260
5261	OMPArrayShapingExpr *
5262	OMPArrayShapingExpr::Create(const ASTContext &Context, QualType T, Expr *Op,
5263	SourceLocation L, SourceLocation R,
5264	ArrayRef<Expr *> Dims,
5265	ArrayRef<SourceRange> BracketRanges) {
5266	assert(Dims.size() == BracketRanges.size() &&
5267	"Different number of dimensions and brackets ranges.");
5268	void *Mem = Context.Allocate(
5269	Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: Dims.size() + 1, Counts: Dims.size()),
5270	Align: alignof(OMPArrayShapingExpr));
5271	auto *E = new (Mem) OMPArrayShapingExpr(T, Op, L, R, Dims);
5272	E->setBracketsRanges(BracketRanges);
5273	return E;
5274	}
5275
5276	OMPArrayShapingExpr *OMPArrayShapingExpr::CreateEmpty(const ASTContext &Context,
5277	unsigned NumDims) {
5278	void *Mem = Context.Allocate(
5279	Size: totalSizeToAlloc<Expr *, SourceRange>(Counts: NumDims + 1, Counts: NumDims),
5280	Align: alignof(OMPArrayShapingExpr));
5281	return new (Mem) OMPArrayShapingExpr(EmptyShell(), NumDims);
5282	}
5283
5284	void OMPIteratorExpr::setIteratorDeclaration(unsigned I, Decl *D) {
5285	getTrailingObjects<Decl *>(NumIterators)[I] = D;
5286	}
5287
5288	void OMPIteratorExpr::setAssignmentLoc(unsigned I, SourceLocation Loc) {
5289	assert(I < NumIterators &&
5290	"Idx is greater or equal the number of iterators definitions.");
5291	getTrailingObjects<
5292	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5293	static_cast<int>(RangeLocOffset::AssignLoc)] = Loc;
5294	}
5295
5296	void OMPIteratorExpr::setIteratorRange(unsigned I, Expr *Begin,
5297	SourceLocation ColonLoc, Expr *End,
5298	SourceLocation SecondColonLoc,
5299	Expr *Step) {
5300	assert(I < NumIterators &&
5301	"Idx is greater or equal the number of iterators definitions.");
5302	getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5303	static_cast<int>(RangeExprOffset::Begin)] =
5304	Begin;
5305	getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5306	static_cast<int>(RangeExprOffset::End)] = End;
5307	getTrailingObjects<Expr *>()[I * static_cast<int>(RangeExprOffset::Total) +
5308	static_cast<int>(RangeExprOffset::Step)] = Step;
5309	getTrailingObjects<
5310	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5311	static_cast<int>(RangeLocOffset::FirstColonLoc)] =
5312	ColonLoc;
5313	getTrailingObjects<
5314	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5315	static_cast<int>(RangeLocOffset::SecondColonLoc)] =
5316	SecondColonLoc;
5317	}
5318
5319	Decl *OMPIteratorExpr::getIteratorDecl(unsigned I) {
5320	return getTrailingObjects<Decl *>()[I];
5321	}
5322
5323	OMPIteratorExpr::IteratorRange OMPIteratorExpr::getIteratorRange(unsigned I) {
5324	IteratorRange Res;
5325	Res.Begin =
5326	getTrailingObjects<Expr *>()[I * static_cast<int>(
5327	RangeExprOffset::Total) +
5328	static_cast<int>(RangeExprOffset::Begin)];
5329	Res.End =
5330	getTrailingObjects<Expr *>()[I * static_cast<int>(
5331	RangeExprOffset::Total) +
5332	static_cast<int>(RangeExprOffset::End)];
5333	Res.Step =
5334	getTrailingObjects<Expr *>()[I * static_cast<int>(
5335	RangeExprOffset::Total) +
5336	static_cast<int>(RangeExprOffset::Step)];
5337	return Res;
5338	}
5339
5340	SourceLocation OMPIteratorExpr::getAssignLoc(unsigned I) const {
5341	return getTrailingObjects<
5342	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5343	static_cast<int>(RangeLocOffset::AssignLoc)];
5344	}
5345
5346	SourceLocation OMPIteratorExpr::getColonLoc(unsigned I) const {
5347	return getTrailingObjects<
5348	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5349	static_cast<int>(RangeLocOffset::FirstColonLoc)];
5350	}
5351
5352	SourceLocation OMPIteratorExpr::getSecondColonLoc(unsigned I) const {
5353	return getTrailingObjects<
5354	SourceLocation>()[I * static_cast<int>(RangeLocOffset::Total) +
5355	static_cast<int>(RangeLocOffset::SecondColonLoc)];
5356	}
5357
5358	void OMPIteratorExpr::setHelper(unsigned I, const OMPIteratorHelperData &D) {
5359	getTrailingObjects<OMPIteratorHelperData>()[I] = D;
5360	}
5361
5362	OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) {
5363	return getTrailingObjects<OMPIteratorHelperData>()[I];
5364	}
5365
5366	const OMPIteratorHelperData &OMPIteratorExpr::getHelper(unsigned I) const {
5367	return getTrailingObjects<OMPIteratorHelperData>()[I];
5368	}
5369
5370	OMPIteratorExpr::OMPIteratorExpr(
5371	QualType ExprTy, SourceLocation IteratorKwLoc, SourceLocation L,
5372	SourceLocation R, ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5373	ArrayRef<OMPIteratorHelperData> Helpers)
5374	: Expr(OMPIteratorExprClass, ExprTy, VK_LValue, OK_Ordinary),
5375	IteratorKwLoc(IteratorKwLoc), LPLoc(L), RPLoc(R),
5376	NumIterators(Data.size()) {
5377	for (unsigned I = 0, E = Data.size(); I < E; ++I) {
5378	const IteratorDefinition &D = Data[I];
5379	setIteratorDeclaration(I, D: D.IteratorDecl);
5380	setAssignmentLoc(I, Loc: D.AssignmentLoc);
5381	setIteratorRange(I, Begin: D.Range.Begin, ColonLoc: D.ColonLoc, End: D.Range.End,
5382	SecondColonLoc: D.SecondColonLoc, Step: D.Range.Step);
5383	setHelper(I, D: Helpers[I]);
5384	}
5385	setDependence(computeDependence(E: this));
5386	}
5387
5388	OMPIteratorExpr *
5389	OMPIteratorExpr::Create(const ASTContext &Context, QualType T,
5390	SourceLocation IteratorKwLoc, SourceLocation L,
5391	SourceLocation R,
5392	ArrayRef<OMPIteratorExpr::IteratorDefinition> Data,
5393	ArrayRef<OMPIteratorHelperData> Helpers) {
5394	assert(Data.size() == Helpers.size() &&
5395	"Data and helpers must have the same size.");
5396	void *Mem = Context.Allocate(
5397	Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5398	Counts: Data.size(), Counts: Data.size() * static_cast<int>(RangeExprOffset::Total),
5399	Counts: Data.size() * static_cast<int>(RangeLocOffset::Total),
5400	Counts: Helpers.size()),
5401	Align: alignof(OMPIteratorExpr));
5402	return new (Mem) OMPIteratorExpr(T, IteratorKwLoc, L, R, Data, Helpers);
5403	}
5404
5405	OMPIteratorExpr *OMPIteratorExpr::CreateEmpty(const ASTContext &Context,
5406	unsigned NumIterators) {
5407	void *Mem = Context.Allocate(
5408	Size: totalSizeToAlloc<Decl *, Expr *, SourceLocation, OMPIteratorHelperData>(
5409	Counts: NumIterators, Counts: NumIterators * static_cast<int>(RangeExprOffset::Total),
5410	Counts: NumIterators * static_cast<int>(RangeLocOffset::Total), Counts: NumIterators),
5411	Align: alignof(OMPIteratorExpr));
5412	return new (Mem) OMPIteratorExpr(EmptyShell(), NumIterators);
5413	}
5414
5415	HLSLOutArgExpr *HLSLOutArgExpr::Create(const ASTContext &C, QualType Ty,
5416	OpaqueValueExpr *Base,
5417	OpaqueValueExpr *OpV, Expr *WB,
5418	bool IsInOut) {
5419	return new (C) HLSLOutArgExpr(Ty, Base, OpV, WB, IsInOut);
5420	}
5421
5422	HLSLOutArgExpr *HLSLOutArgExpr::CreateEmpty(const ASTContext &C) {
5423	return new (C) HLSLOutArgExpr(EmptyShell());
5424	}
5425
5426	OpenACCAsteriskSizeExpr *OpenACCAsteriskSizeExpr::Create(const ASTContext &C,
5427	SourceLocation Loc) {
5428	return new (C) OpenACCAsteriskSizeExpr(Loc, C.IntTy);
5429	}
5430
5431	OpenACCAsteriskSizeExpr *
5432	OpenACCAsteriskSizeExpr::CreateEmpty(const ASTContext &C) {
5433	return new (C) OpenACCAsteriskSizeExpr({}, C.IntTy);
5434	}
5435
5436	ConvertVectorExpr *ConvertVectorExpr::CreateEmpty(const ASTContext &C,
5437	bool hasFPFeatures) {
5438	void *Mem = C.Allocate(Size: totalSizeToAlloc<FPOptionsOverride>(Counts: hasFPFeatures),
5439	Align: alignof(ConvertVectorExpr));
5440	return new (Mem) ConvertVectorExpr(hasFPFeatures, EmptyShell());
5441	}
5442
5443	ConvertVectorExpr *ConvertVectorExpr::Create(
5444	const ASTContext &C, Expr *SrcExpr, TypeSourceInfo *TI, QualType DstType,
5445	ExprValueKind VK, ExprObjectKind OK, SourceLocation BuiltinLoc,
5446	SourceLocation RParenLoc, FPOptionsOverride FPFeatures) {
5447	bool HasFPFeatures = FPFeatures.requiresTrailingStorage();
5448	unsigned Size = totalSizeToAlloc<FPOptionsOverride>(Counts: HasFPFeatures);
5449	void *Mem = C.Allocate(Size, Align: alignof(ConvertVectorExpr));
5450	return new (Mem) ConvertVectorExpr(SrcExpr, TI, DstType, VK, OK, BuiltinLoc,
5451	RParenLoc, FPFeatures);
5452	}
5453