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