1	//===--- SemaPseudoObject.cpp - Semantic Analysis for Pseudo-Objects ------===//
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 semantic analysis for expressions involving
10	// pseudo-object references. Pseudo-objects are conceptual objects
11	// whose storage is entirely abstract and all accesses to which are
12	// translated through some sort of abstraction barrier.
13	//
14	// For example, Objective-C objects can have "properties", either
15	// declared or undeclared. A property may be accessed by writing
16	// expr.prop
17	// where 'expr' is an r-value of Objective-C pointer type and 'prop'
18	// is the name of the property. If this expression is used in a context
19	// needing an r-value, it is treated as if it were a message-send
20	// of the associated 'getter' selector, typically:
21	// [expr prop]
22	// If it is used as the LHS of a simple assignment, it is treated
23	// as a message-send of the associated 'setter' selector, typically:
24	// [expr setProp: RHS]
25	// If it is used as the LHS of a compound assignment, or the operand
26	// of a unary increment or decrement, both are required; for example,
27	// 'expr.prop *= 100' would be translated to:
28	// [expr setProp: [expr prop] * 100]
29	//
30	//===----------------------------------------------------------------------===//
31
32	#include "clang/Sema/SemaPseudoObject.h"
33	#include "clang/AST/ExprCXX.h"
34	#include "clang/AST/ExprObjC.h"
35	#include "clang/Basic/CharInfo.h"
36	#include "clang/Lex/Preprocessor.h"
37	#include "clang/Sema/Initialization.h"
38	#include "clang/Sema/ScopeInfo.h"
39	#include "clang/Sema/SemaObjC.h"
40
41	using namespace clang;
42	using namespace sema;
43
44	namespace {
45	// Basically just a very focused copy of TreeTransform.
46	struct Rebuilder {
47	Sema &S;
48	unsigned MSPropertySubscriptCount;
49	typedef llvm::function_ref<Expr *(Expr *, unsigned)> SpecificRebuilderRefTy;
50	const SpecificRebuilderRefTy &SpecificCallback;
51	Rebuilder(Sema &S, const SpecificRebuilderRefTy &SpecificCallback)
52	: S(S), MSPropertySubscriptCount(0),
53	SpecificCallback(SpecificCallback) {}
54
55	Expr *rebuildObjCPropertyRefExpr(ObjCPropertyRefExpr *refExpr) {
56	// Fortunately, the constraint that we're rebuilding something
57	// with a base limits the number of cases here.
58	if (refExpr->isClassReceiver() || refExpr->isSuperReceiver())
59	return refExpr;
60
61	if (refExpr->isExplicitProperty()) {
62	return new (S.Context) ObjCPropertyRefExpr(
63	refExpr->getExplicitProperty(), refExpr->getType(),
64	refExpr->getValueKind(), refExpr->getObjectKind(),
65	refExpr->getLocation(), SpecificCallback(refExpr->getBase(), 0));
66	}
67	return new (S.Context) ObjCPropertyRefExpr(
68	refExpr->getImplicitPropertyGetter(),
69	refExpr->getImplicitPropertySetter(), refExpr->getType(),
70	refExpr->getValueKind(), refExpr->getObjectKind(),
71	refExpr->getLocation(), SpecificCallback(refExpr->getBase(), 0));
72	}
73	Expr *rebuildObjCSubscriptRefExpr(ObjCSubscriptRefExpr *refExpr) {
74	assert(refExpr->getBaseExpr());
75	assert(refExpr->getKeyExpr());
76
77	return new (S.Context) ObjCSubscriptRefExpr(
78	SpecificCallback(refExpr->getBaseExpr(), 0),
79	SpecificCallback(refExpr->getKeyExpr(), 1), refExpr->getType(),
80	refExpr->getValueKind(), refExpr->getObjectKind(),
81	refExpr->getAtIndexMethodDecl(), refExpr->setAtIndexMethodDecl(),
82	refExpr->getRBracket());
83	}
84	Expr *rebuildMSPropertyRefExpr(MSPropertyRefExpr *refExpr) {
85	assert(refExpr->getBaseExpr());
86
87	return new (S.Context) MSPropertyRefExpr(
88	SpecificCallback(refExpr->getBaseExpr(), 0),
89	refExpr->getPropertyDecl(), refExpr->isArrow(), refExpr->getType(),
90	refExpr->getValueKind(), refExpr->getQualifierLoc(),
91	refExpr->getMemberLoc());
92	}
93	Expr *rebuildMSPropertySubscriptExpr(MSPropertySubscriptExpr *refExpr) {
94	assert(refExpr->getBase());
95	assert(refExpr->getIdx());
96
97	auto *NewBase = rebuild(e: refExpr->getBase());
98	++MSPropertySubscriptCount;
99	return new (S.Context) MSPropertySubscriptExpr(
100	NewBase,
101	SpecificCallback(refExpr->getIdx(), MSPropertySubscriptCount),
102	refExpr->getType(), refExpr->getValueKind(), refExpr->getObjectKind(),
103	refExpr->getRBracketLoc());
104	}
105
106	Expr *rebuild(Expr *e) {
107	// Fast path: nothing to look through.
108	if (auto *PRE = dyn_cast<ObjCPropertyRefExpr>(Val: e))
109	return rebuildObjCPropertyRefExpr(refExpr: PRE);
110	if (auto *SRE = dyn_cast<ObjCSubscriptRefExpr>(Val: e))
111	return rebuildObjCSubscriptRefExpr(refExpr: SRE);
112	if (auto *MSPRE = dyn_cast<MSPropertyRefExpr>(Val: e))
113	return rebuildMSPropertyRefExpr(refExpr: MSPRE);
114	if (auto *MSPSE = dyn_cast<MSPropertySubscriptExpr>(Val: e))
115	return rebuildMSPropertySubscriptExpr(refExpr: MSPSE);
116
117	// Otherwise, we should look through and rebuild anything that
118	// IgnoreParens would.
119
120	if (ParenExpr *parens = dyn_cast<ParenExpr>(Val: e)) {
121	e = rebuild(e: parens->getSubExpr());
122	return new (S.Context) ParenExpr(parens->getLParen(),
123	parens->getRParen(),
124	e);
125	}
126
127	if (UnaryOperator *uop = dyn_cast<UnaryOperator>(Val: e)) {
128	assert(uop->getOpcode() == UO_Extension);
129	e = rebuild(e: uop->getSubExpr());
130	return UnaryOperator::Create(
131	C: S.Context, input: e, opc: uop->getOpcode(), type: uop->getType(), VK: uop->getValueKind(),
132	OK: uop->getObjectKind(), l: uop->getOperatorLoc(), CanOverflow: uop->canOverflow(),
133	FPFeatures: S.CurFPFeatureOverrides());
134	}
135
136	if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(Val: e)) {
137	assert(!gse->isResultDependent());
138	unsigned resultIndex = gse->getResultIndex();
139	unsigned numAssocs = gse->getNumAssocs();
140
141	SmallVector<Expr *, 8> assocExprs;
142	SmallVector<TypeSourceInfo *, 8> assocTypes;
143	assocExprs.reserve(N: numAssocs);
144	assocTypes.reserve(N: numAssocs);
145
146	for (const GenericSelectionExpr::Association assoc :
147	gse->associations()) {
148	Expr *assocExpr = assoc.getAssociationExpr();
149	if (assoc.isSelected())
150	assocExpr = rebuild(e: assocExpr);
151	assocExprs.push_back(Elt: assocExpr);
152	assocTypes.push_back(Elt: assoc.getTypeSourceInfo());
153	}
154
155	if (gse->isExprPredicate())
156	return GenericSelectionExpr::Create(
157	S.Context, gse->getGenericLoc(), gse->getControllingExpr(),
158	assocTypes, assocExprs, gse->getDefaultLoc(), gse->getRParenLoc(),
159	gse->containsUnexpandedParameterPack(), resultIndex);
160	return GenericSelectionExpr::Create(
161	S.Context, gse->getGenericLoc(), gse->getControllingType(),
162	assocTypes, assocExprs, gse->getDefaultLoc(), gse->getRParenLoc(),
163	gse->containsUnexpandedParameterPack(), resultIndex);
164	}
165
166	if (ChooseExpr *ce = dyn_cast<ChooseExpr>(Val: e)) {
167	assert(!ce->isConditionDependent());
168
169	Expr *LHS = ce->getLHS(), *RHS = ce->getRHS();
170	Expr *&rebuiltExpr = ce->isConditionTrue() ? LHS : RHS;
171	rebuiltExpr = rebuild(e: rebuiltExpr);
172
173	return new (S.Context)
174	ChooseExpr(ce->getBuiltinLoc(), ce->getCond(), LHS, RHS,
175	rebuiltExpr->getType(), rebuiltExpr->getValueKind(),
176	rebuiltExpr->getObjectKind(), ce->getRParenLoc(),
177	ce->isConditionTrue());
178	}
179
180	llvm_unreachable("bad expression to rebuild!");
181	}
182	};
183
184	class PseudoOpBuilder {
185	public:
186	Sema &S;
187	unsigned ResultIndex;
188	SourceLocation GenericLoc;
189	bool IsUnique;
190	SmallVector<Expr *, 4> Semantics;
191
192	PseudoOpBuilder(Sema &S, SourceLocation genericLoc, bool IsUnique)
193	: S(S), ResultIndex(PseudoObjectExpr::NoResult),
194	GenericLoc(genericLoc), IsUnique(IsUnique) {}
195
196	virtual ~PseudoOpBuilder() {}
197
198	/// Add a normal semantic expression.
199	void addSemanticExpr(Expr *semantic) {
200	Semantics.push_back(Elt: semantic);
201	}
202
203	/// Add the 'result' semantic expression.
204	void addResultSemanticExpr(Expr *resultExpr) {
205	assert(ResultIndex == PseudoObjectExpr::NoResult);
206	ResultIndex = Semantics.size();
207	Semantics.push_back(Elt: resultExpr);
208	// An OVE is not unique if it is used as the result expression.
209	if (auto *OVE = dyn_cast<OpaqueValueExpr>(Val: Semantics.back()))
210	OVE->setIsUnique(false);
211	}
212
213	ExprResult buildRValueOperation(Expr *op);
214	ExprResult buildAssignmentOperation(Scope *Sc,
215	SourceLocation opLoc,
216	BinaryOperatorKind opcode,
217	Expr *LHS, Expr *RHS);
218	ExprResult buildIncDecOperation(Scope *Sc, SourceLocation opLoc,
219	UnaryOperatorKind opcode,
220	Expr *op);
221
222	virtual ExprResult complete(Expr *syntacticForm);
223
224	OpaqueValueExpr *capture(Expr *op);
225	OpaqueValueExpr *captureValueAsResult(Expr *op);
226
227	void setResultToLastSemantic() {
228	assert(ResultIndex == PseudoObjectExpr::NoResult);
229	ResultIndex = Semantics.size() - 1;
230	// An OVE is not unique if it is used as the result expression.
231	if (auto *OVE = dyn_cast<OpaqueValueExpr>(Val: Semantics.back()))
232	OVE->setIsUnique(false);
233	}
234
235	/// Return true if assignments have a non-void result.
236	static bool CanCaptureValue(Expr *exp) {
237	if (exp->isGLValue())
238	return true;
239	QualType ty = exp->getType();
240	assert(!ty->isIncompleteType());
241	assert(!ty->isDependentType());
242
243	if (const CXXRecordDecl *ClassDecl = ty->getAsCXXRecordDecl())
244	return ClassDecl->isTriviallyCopyable();
245	return true;
246	}
247
248	virtual Expr *rebuildAndCaptureObject(Expr *) = 0;
249	virtual ExprResult buildGet() = 0;
250	virtual ExprResult buildSet(Expr *, SourceLocation,
251	bool captureSetValueAsResult) = 0;
252	/// Should the result of an assignment be the formal result of the
253	/// setter call or the value that was passed to the setter?
254	///
255	/// Different pseudo-object language features use different language rules
256	/// for this.
257	/// The default is to use the set value. Currently, this affects the
258	/// behavior of simple assignments, compound assignments, and prefix
259	/// increment and decrement.
260	/// Postfix increment and decrement always use the getter result as the
261	/// expression result.
262	///
263	/// If this method returns true, and the set value isn't capturable for
264	/// some reason, the result of the expression will be void.
265	virtual bool captureSetValueAsResult() const { return true; }
266	};
267
268	/// A PseudoOpBuilder for Objective-C \@properties.
269	class ObjCPropertyOpBuilder : public PseudoOpBuilder {
270	ObjCPropertyRefExpr *RefExpr;
271	ObjCPropertyRefExpr *SyntacticRefExpr;
272	OpaqueValueExpr *InstanceReceiver;
273	ObjCMethodDecl *Getter;
274
275	ObjCMethodDecl *Setter;
276	Selector SetterSelector;
277	Selector GetterSelector;
278
279	public:
280	ObjCPropertyOpBuilder(Sema &S, ObjCPropertyRefExpr *refExpr, bool IsUnique)
281	: PseudoOpBuilder(S, refExpr->getLocation(), IsUnique),
282	RefExpr(refExpr), SyntacticRefExpr(nullptr),
283	InstanceReceiver(nullptr), Getter(nullptr), Setter(nullptr) {
284	}
285
286	ExprResult buildRValueOperation(Expr *op);
287	ExprResult buildAssignmentOperation(Scope *Sc,
288	SourceLocation opLoc,
289	BinaryOperatorKind opcode,
290	Expr *LHS, Expr *RHS);
291	ExprResult buildIncDecOperation(Scope *Sc, SourceLocation opLoc,
292	UnaryOperatorKind opcode,
293	Expr *op);
294
295	bool tryBuildGetOfReference(Expr *op, ExprResult &result);
296	bool findSetter(bool warn=true);
297	bool findGetter();
298	void DiagnoseUnsupportedPropertyUse();
299
300	Expr *rebuildAndCaptureObject(Expr *syntacticBase) override;
301	ExprResult buildGet() override;
302	ExprResult buildSet(Expr *op, SourceLocation, bool) override;
303	ExprResult complete(Expr *SyntacticForm) override;
304
305	bool isWeakProperty() const;
306	};
307
308	/// A PseudoOpBuilder for Objective-C array/dictionary indexing.
309	class ObjCSubscriptOpBuilder : public PseudoOpBuilder {
310	ObjCSubscriptRefExpr *RefExpr;
311	OpaqueValueExpr *InstanceBase;
312	OpaqueValueExpr *InstanceKey;
313	ObjCMethodDecl *AtIndexGetter;
314	Selector AtIndexGetterSelector;
315
316	ObjCMethodDecl *AtIndexSetter;
317	Selector AtIndexSetterSelector;
318
319	public:
320	ObjCSubscriptOpBuilder(Sema &S, ObjCSubscriptRefExpr *refExpr, bool IsUnique)
321	: PseudoOpBuilder(S, refExpr->getSourceRange().getBegin(), IsUnique),
322	RefExpr(refExpr), InstanceBase(nullptr), InstanceKey(nullptr),
323	AtIndexGetter(nullptr), AtIndexSetter(nullptr) {}
324
325	ExprResult buildRValueOperation(Expr *op);
326	ExprResult buildAssignmentOperation(Scope *Sc,
327	SourceLocation opLoc,
328	BinaryOperatorKind opcode,
329	Expr *LHS, Expr *RHS);
330	Expr *rebuildAndCaptureObject(Expr *syntacticBase) override;
331
332	bool findAtIndexGetter();
333	bool findAtIndexSetter();
334
335	ExprResult buildGet() override;
336	ExprResult buildSet(Expr *op, SourceLocation, bool) override;
337	};
338
339	class MSPropertyOpBuilder : public PseudoOpBuilder {
340	MSPropertyRefExpr *RefExpr;
341	OpaqueValueExpr *InstanceBase;
342	SmallVector<Expr *, 4> CallArgs;
343
344	MSPropertyRefExpr *getBaseMSProperty(MSPropertySubscriptExpr *E);
345
346	public:
347	MSPropertyOpBuilder(Sema &S, MSPropertyRefExpr *refExpr, bool IsUnique)
348	: PseudoOpBuilder(S, refExpr->getSourceRange().getBegin(), IsUnique),
349	RefExpr(refExpr), InstanceBase(nullptr) {}
350	MSPropertyOpBuilder(Sema &S, MSPropertySubscriptExpr *refExpr, bool IsUnique)
351	: PseudoOpBuilder(S, refExpr->getSourceRange().getBegin(), IsUnique),
352	InstanceBase(nullptr) {
353	RefExpr = getBaseMSProperty(E: refExpr);
354	}
355
356	Expr *rebuildAndCaptureObject(Expr *) override;
357	ExprResult buildGet() override;
358	ExprResult buildSet(Expr *op, SourceLocation, bool) override;
359	bool captureSetValueAsResult() const override { return false; }
360	};
361	}
362
363	/// Capture the given expression in an OpaqueValueExpr.
364	OpaqueValueExpr *PseudoOpBuilder::capture(Expr *e) {
365	// Make a new OVE whose source is the given expression.
366	OpaqueValueExpr *captured =
367	new (S.Context) OpaqueValueExpr(GenericLoc, e->getType(),
368	e->getValueKind(), e->getObjectKind(),
369	e);
370	if (IsUnique)
371	captured->setIsUnique(true);
372
373	// Make sure we bind that in the semantics.
374	addSemanticExpr(captured);
375	return captured;
376	}
377
378	/// Capture the given expression as the result of this pseudo-object
379	/// operation. This routine is safe against expressions which may
380	/// already be captured.
381	///
382	/// \returns the captured expression, which will be the
383	/// same as the input if the input was already captured
384	OpaqueValueExpr *PseudoOpBuilder::captureValueAsResult(Expr *e) {
385	assert(ResultIndex == PseudoObjectExpr::NoResult);
386
387	// If the expression hasn't already been captured, just capture it
388	// and set the new semantic
389	if (!isa<OpaqueValueExpr>(Val: e)) {
390	OpaqueValueExpr *cap = capture(e);
391	setResultToLastSemantic();
392	return cap;
393	}
394
395	// Otherwise, it must already be one of our semantic expressions;
396	// set ResultIndex to its index.
397	unsigned index = 0;
398	for (;; ++index) {
399	assert(index < Semantics.size() &&
400	"captured expression not found in semantics!");
401	if (e == Semantics[index]) break;
402	}
403	ResultIndex = index;
404	// An OVE is not unique if it is used as the result expression.
405	cast<OpaqueValueExpr>(Val: e)->setIsUnique(false);
406	return cast<OpaqueValueExpr>(Val: e);
407	}
408
409	/// The routine which creates the final PseudoObjectExpr.
410	ExprResult PseudoOpBuilder::complete(Expr *syntactic) {
411	return PseudoObjectExpr::Create(Context: S.Context, syntactic,
412	semantic: Semantics, resultIndex: ResultIndex);
413	}
414
415	/// The main skeleton for building an r-value operation.
416	ExprResult PseudoOpBuilder::buildRValueOperation(Expr *op) {
417	Expr *syntacticBase = rebuildAndCaptureObject(op);
418
419	ExprResult getExpr = buildGet();
420	if (getExpr.isInvalid()) return ExprError();
421	addResultSemanticExpr(resultExpr: getExpr.get());
422
423	return complete(syntactic: syntacticBase);
424	}
425
426	/// The basic skeleton for building a simple or compound
427	/// assignment operation.
428	ExprResult
429	PseudoOpBuilder::buildAssignmentOperation(Scope *Sc, SourceLocation opcLoc,
430	BinaryOperatorKind opcode,
431	Expr *LHS, Expr *RHS) {
432	assert(BinaryOperator::isAssignmentOp(opcode));
433
434	Expr *syntacticLHS = rebuildAndCaptureObject(LHS);
435	OpaqueValueExpr *capturedRHS = capture(e: RHS);
436
437	// In some very specific cases, semantic analysis of the RHS as an
438	// expression may require it to be rewritten. In these cases, we
439	// cannot safely keep the OVE around. Fortunately, we don't really
440	// need to: we don't use this particular OVE in multiple places, and
441	// no clients rely that closely on matching up expressions in the
442	// semantic expression with expressions from the syntactic form.
443	Expr *semanticRHS = capturedRHS;
444	if (RHS->hasPlaceholderType() || isa<InitListExpr>(Val: RHS)) {
445	semanticRHS = RHS;
446	Semantics.pop_back();
447	}
448
449	Expr *syntactic;
450
451	ExprResult result;
452	if (opcode == BO_Assign) {
453	result = semanticRHS;
454	syntactic = BinaryOperator::Create(C: S.Context, lhs: syntacticLHS, rhs: capturedRHS,
455	opc: opcode, ResTy: capturedRHS->getType(),
456	VK: capturedRHS->getValueKind(), OK: OK_Ordinary,
457	opLoc: opcLoc, FPFeatures: S.CurFPFeatureOverrides());
458
459	} else {
460	ExprResult opLHS = buildGet();
461	if (opLHS.isInvalid()) return ExprError();
462
463	// Build an ordinary, non-compound operation.
464	BinaryOperatorKind nonCompound =
465	BinaryOperator::getOpForCompoundAssignment(Opc: opcode);
466	result = S.BuildBinOp(S: Sc, OpLoc: opcLoc, Opc: nonCompound, LHSExpr: opLHS.get(), RHSExpr: semanticRHS);
467	if (result.isInvalid()) return ExprError();
468
469	syntactic = CompoundAssignOperator::Create(
470	S.Context, syntacticLHS, capturedRHS, opcode, result.get()->getType(),
471	result.get()->getValueKind(), OK_Ordinary, opcLoc,
472	S.CurFPFeatureOverrides(), opLHS.get()->getType(),
473	result.get()->getType());
474	}
475
476	// The result of the assignment, if not void, is the value set into
477	// the l-value.
478	result = buildSet(result.get(), opcLoc, captureSetValueAsResult: captureSetValueAsResult());
479	if (result.isInvalid()) return ExprError();
480	addSemanticExpr(semantic: result.get());
481	if (!captureSetValueAsResult() && !result.get()->getType()->isVoidType() &&
482	(result.get()->isTypeDependent() || CanCaptureValue(exp: result.get())))
483	setResultToLastSemantic();
484
485	return complete(syntactic);
486	}
487
488	/// The basic skeleton for building an increment or decrement
489	/// operation.
490	ExprResult
491	PseudoOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
492	UnaryOperatorKind opcode,
493	Expr *op) {
494	assert(UnaryOperator::isIncrementDecrementOp(opcode));
495
496	Expr *syntacticOp = rebuildAndCaptureObject(op);
497
498	// Load the value.
499	ExprResult result = buildGet();
500	if (result.isInvalid()) return ExprError();
501
502	QualType resultType = result.get()->getType();
503
504	// That's the postfix result.
505	if (UnaryOperator::isPostfix(Op: opcode) &&
506	(result.get()->isTypeDependent() || CanCaptureValue(exp: result.get()))) {
507	result = capture(e: result.get());
508	setResultToLastSemantic();
509	}
510
511	// Add or subtract a literal 1.
512	llvm::APInt oneV(S.Context.getTypeSize(S.Context.IntTy), 1);
513	Expr *one = IntegerLiteral::Create(S.Context, oneV, S.Context.IntTy,
514	GenericLoc);
515
516	if (UnaryOperator::isIncrementOp(Op: opcode)) {
517	result = S.BuildBinOp(S: Sc, OpLoc: opcLoc, Opc: BO_Add, LHSExpr: result.get(), RHSExpr: one);
518	} else {
519	result = S.BuildBinOp(S: Sc, OpLoc: opcLoc, Opc: BO_Sub, LHSExpr: result.get(), RHSExpr: one);
520	}
521	if (result.isInvalid()) return ExprError();
522
523	// Store that back into the result. The value stored is the result
524	// of a prefix operation.
525	result = buildSet(result.get(), opcLoc, captureSetValueAsResult: UnaryOperator::isPrefix(Op: opcode) &&
526	captureSetValueAsResult());
527	if (result.isInvalid()) return ExprError();
528	addSemanticExpr(semantic: result.get());
529	if (UnaryOperator::isPrefix(Op: opcode) && !captureSetValueAsResult() &&
530	!result.get()->getType()->isVoidType() &&
531	(result.get()->isTypeDependent() || CanCaptureValue(exp: result.get())))
532	setResultToLastSemantic();
533
534	UnaryOperator *syntactic =
535	UnaryOperator::Create(C: S.Context, input: syntacticOp, opc: opcode, type: resultType,
536	VK: VK_LValue, OK: OK_Ordinary, l: opcLoc,
537	CanOverflow: !resultType->isDependentType()
538	? S.Context.getTypeSize(T: resultType) >=
539	S.Context.getTypeSize(S.Context.IntTy)
540	: false,
541	FPFeatures: S.CurFPFeatureOverrides());
542	return complete(syntactic);
543	}
544
545
546	//===----------------------------------------------------------------------===//
547	// Objective-C @property and implicit property references
548	//===----------------------------------------------------------------------===//
549
550	/// Look up a method in the receiver type of an Objective-C property
551	/// reference.
552	static ObjCMethodDecl *LookupMethodInReceiverType(Sema &S, Selector sel,
553	const ObjCPropertyRefExpr *PRE) {
554	if (PRE->isObjectReceiver()) {
555	const ObjCObjectPointerType *PT =
556	PRE->getBase()->getType()->castAs<ObjCObjectPointerType>();
557
558	// Special case for 'self' in class method implementations.
559	if (PT->isObjCClassType() &&
560	S.ObjC().isSelfExpr(RExpr: const_cast<Expr *>(PRE->getBase()))) {
561	// This cast is safe because isSelfExpr is only true within
562	// methods.
563	ObjCMethodDecl *method =
564	cast<ObjCMethodDecl>(Val: S.CurContext->getNonClosureAncestor());
565	return S.ObjC().LookupMethodInObjectType(
566	Sel: sel, Ty: S.Context.getObjCInterfaceType(Decl: method->getClassInterface()),
567	/*instance*/ IsInstance: false);
568	}
569
570	return S.ObjC().LookupMethodInObjectType(Sel: sel, Ty: PT->getPointeeType(), IsInstance: true);
571	}
572
573	if (PRE->isSuperReceiver()) {
574	if (const ObjCObjectPointerType *PT =
575	PRE->getSuperReceiverType()->getAs<ObjCObjectPointerType>())
576	return S.ObjC().LookupMethodInObjectType(Sel: sel, Ty: PT->getPointeeType(), IsInstance: true);
577
578	return S.ObjC().LookupMethodInObjectType(Sel: sel, Ty: PRE->getSuperReceiverType(),
579	IsInstance: false);
580	}
581
582	assert(PRE->isClassReceiver() && "Invalid expression");
583	QualType IT = S.Context.getObjCInterfaceType(Decl: PRE->getClassReceiver());
584	return S.ObjC().LookupMethodInObjectType(Sel: sel, Ty: IT, IsInstance: false);
585	}
586
587	bool ObjCPropertyOpBuilder::isWeakProperty() const {
588	QualType T;
589	if (RefExpr->isExplicitProperty()) {
590	const ObjCPropertyDecl *Prop = RefExpr->getExplicitProperty();
591	if (Prop->getPropertyAttributes() & ObjCPropertyAttribute::kind_weak)
592	return true;
593
594	T = Prop->getType();
595	} else if (Getter) {
596	T = Getter->getReturnType();
597	} else {
598	return false;
599	}
600
601	return T.getObjCLifetime() == Qualifiers::OCL_Weak;
602	}
603
604	bool ObjCPropertyOpBuilder::findGetter() {
605	if (Getter) return true;
606
607	// For implicit properties, just trust the lookup we already did.
608	if (RefExpr->isImplicitProperty()) {
609	if ((Getter = RefExpr->getImplicitPropertyGetter())) {
610	GetterSelector = Getter->getSelector();
611	return true;
612	}
613	else {
614	// Must build the getter selector the hard way.
615	ObjCMethodDecl *setter = RefExpr->getImplicitPropertySetter();
616	assert(setter && "both setter and getter are null - cannot happen");
617	const IdentifierInfo *setterName =
618	setter->getSelector().getIdentifierInfoForSlot(argIndex: 0);
619	const IdentifierInfo *getterName =
620	&S.Context.Idents.get(Name: setterName->getName().substr(Start: 3));
621	GetterSelector =
622	S.PP.getSelectorTable().getNullarySelector(getterName);
623	return false;
624	}
625	}
626
627	ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
628	Getter = LookupMethodInReceiverType(S, sel: prop->getGetterName(), PRE: RefExpr);
629	return (Getter != nullptr);
630	}
631
632	/// Try to find the most accurate setter declaration for the property
633	/// reference.
634	///
635	/// \return true if a setter was found, in which case Setter
636	bool ObjCPropertyOpBuilder::findSetter(bool warn) {
637	// For implicit properties, just trust the lookup we already did.
638	if (RefExpr->isImplicitProperty()) {
639	if (ObjCMethodDecl *setter = RefExpr->getImplicitPropertySetter()) {
640	Setter = setter;
641	SetterSelector = setter->getSelector();
642	return true;
643	} else {
644	const IdentifierInfo *getterName = RefExpr->getImplicitPropertyGetter()
645	->getSelector()
646	.getIdentifierInfoForSlot(argIndex: 0);
647	SetterSelector =
648	SelectorTable::constructSetterSelector(S.PP.getIdentifierTable(),
649	S.PP.getSelectorTable(),
650	getterName);
651	return false;
652	}
653	}
654
655	// For explicit properties, this is more involved.
656	ObjCPropertyDecl *prop = RefExpr->getExplicitProperty();
657	SetterSelector = prop->getSetterName();
658
659	// Do a normal method lookup first.
660	if (ObjCMethodDecl *setter =
661	LookupMethodInReceiverType(S, SetterSelector, RefExpr)) {
662	if (setter->isPropertyAccessor() && warn)
663	if (const ObjCInterfaceDecl *IFace =
664	dyn_cast<ObjCInterfaceDecl>(setter->getDeclContext())) {
665	StringRef thisPropertyName = prop->getName();
666	// Try flipping the case of the first character.
667	char front = thisPropertyName.front();
668	front = isLowercase(c: front) ? toUppercase(c: front) : toLowercase(c: front);
669	SmallString<100> PropertyName = thisPropertyName;
670	PropertyName[0] = front;
671	const IdentifierInfo *AltMember =
672	&S.PP.getIdentifierTable().get(Name: PropertyName);
673	if (ObjCPropertyDecl *prop1 = IFace->FindPropertyDeclaration(
674	AltMember, prop->getQueryKind()))
675	if (prop != prop1 && (prop1->getSetterMethodDecl() == setter)) {
676	S.Diag(RefExpr->getExprLoc(), diag::err_property_setter_ambiguous_use)
677	<< prop << prop1 << setter->getSelector();
678	S.Diag(prop->getLocation(), diag::note_property_declare);
679	S.Diag(prop1->getLocation(), diag::note_property_declare);
680	}
681	}
682	Setter = setter;
683	return true;
684	}
685
686	// That can fail in the somewhat crazy situation that we're
687	// type-checking a message send within the @interface declaration
688	// that declared the @property. But it's not clear that that's
689	// valuable to support.
690
691	return false;
692	}
693
694	void ObjCPropertyOpBuilder::DiagnoseUnsupportedPropertyUse() {
695	if (S.getCurLexicalContext()->isObjCContainer() &&
696	S.getCurLexicalContext()->getDeclKind() != Decl::ObjCCategoryImpl &&
697	S.getCurLexicalContext()->getDeclKind() != Decl::ObjCImplementation) {
698	if (ObjCPropertyDecl *prop = RefExpr->getExplicitProperty()) {
699	S.Diag(RefExpr->getLocation(),
700	diag::err_property_function_in_objc_container);
701	S.Diag(prop->getLocation(), diag::note_property_declare);
702	}
703	}
704	}
705
706	/// Capture the base object of an Objective-C property expression.
707	Expr *ObjCPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
708	assert(InstanceReceiver == nullptr);
709
710	// If we have a base, capture it in an OVE and rebuild the syntactic
711	// form to use the OVE as its base.
712	if (RefExpr->isObjectReceiver()) {
713	InstanceReceiver = capture(RefExpr->getBase());
714	syntacticBase = Rebuilder(S, [=](Expr *, unsigned) -> Expr * {
715	return InstanceReceiver;
716	}).rebuild(e: syntacticBase);
717	}
718
719	if (ObjCPropertyRefExpr *
720	refE = dyn_cast<ObjCPropertyRefExpr>(Val: syntacticBase->IgnoreParens()))
721	SyntacticRefExpr = refE;
722
723	return syntacticBase;
724	}
725
726	/// Load from an Objective-C property reference.
727	ExprResult ObjCPropertyOpBuilder::buildGet() {
728	findGetter();
729	if (!Getter) {
730	DiagnoseUnsupportedPropertyUse();
731	return ExprError();
732	}
733
734	if (SyntacticRefExpr)
735	SyntacticRefExpr->setIsMessagingGetter();
736
737	QualType receiverType = RefExpr->getReceiverType(ctx: S.Context);
738	if (!Getter->isImplicit())
739	S.DiagnoseUseOfDecl(Getter, GenericLoc, nullptr, true);
740	// Build a message-send.
741	ExprResult msg;
742	if ((Getter->isInstanceMethod() && !RefExpr->isClassReceiver()) ||
743	RefExpr->isObjectReceiver()) {
744	assert(InstanceReceiver || RefExpr->isSuperReceiver());
745	msg = S.ObjC().BuildInstanceMessageImplicit(
746	InstanceReceiver, receiverType, GenericLoc, Getter->getSelector(),
747	Getter, {});
748	} else {
749	msg = S.ObjC().BuildClassMessageImplicit(
750	ReceiverType: receiverType, isSuperReceiver: RefExpr->isSuperReceiver(), Loc: GenericLoc,
751	Sel: Getter->getSelector(), Method: Getter, Args: {});
752	}
753	return msg;
754	}
755
756	/// Store to an Objective-C property reference.
757	///
758	/// \param captureSetValueAsResult If true, capture the actual
759	/// value being set as the value of the property operation.
760	ExprResult ObjCPropertyOpBuilder::buildSet(Expr *op, SourceLocation opcLoc,
761	bool captureSetValueAsResult) {
762	if (!findSetter(warn: false)) {
763	DiagnoseUnsupportedPropertyUse();
764	return ExprError();
765	}
766
767	if (SyntacticRefExpr)
768	SyntacticRefExpr->setIsMessagingSetter();
769
770	QualType receiverType = RefExpr->getReceiverType(ctx: S.Context);
771
772	// Use assignment constraints when possible; they give us better
773	// diagnostics. "When possible" basically means anything except a
774	// C++ class type.
775	if (!S.getLangOpts().CPlusPlus || !op->getType()->isRecordType()) {
776	QualType paramType = (*Setter->param_begin())->getType()
777	.substObjCMemberType(
778	receiverType,
779	Setter->getDeclContext(),
780	ObjCSubstitutionContext::Parameter);
781	if (!S.getLangOpts().CPlusPlus || !paramType->isRecordType()) {
782	ExprResult opResult = op;
783	AssignConvertType assignResult =
784	S.CheckSingleAssignmentConstraints(LHSType: paramType, RHS&: opResult);
785	if (opResult.isInvalid() ||
786	S.DiagnoseAssignmentResult(ConvTy: assignResult, Loc: opcLoc, DstType: paramType,
787	SrcType: op->getType(), SrcExpr: opResult.get(),
788	Action: AssignmentAction::Assigning))
789	return ExprError();
790
791	op = opResult.get();
792	assert(op && "successful assignment left argument invalid?");
793	}
794	}
795
796	// Arguments.
797	Expr *args[] = { op };
798
799	// Build a message-send.
800	ExprResult msg;
801	if (!Setter->isImplicit())
802	S.DiagnoseUseOfDecl(Setter, GenericLoc, nullptr, true);
803	if ((Setter->isInstanceMethod() && !RefExpr->isClassReceiver()) ||
804	RefExpr->isObjectReceiver()) {
805	msg = S.ObjC().BuildInstanceMessageImplicit(InstanceReceiver, receiverType,
806	GenericLoc, SetterSelector,
807	Setter, MultiExprArg(args, 1));
808	} else {
809	msg = S.ObjC().BuildClassMessageImplicit(
810	receiverType, RefExpr->isSuperReceiver(), GenericLoc, SetterSelector,
811	Setter, MultiExprArg(args, 1));
812	}
813
814	if (!msg.isInvalid() && captureSetValueAsResult) {
815	ObjCMessageExpr *msgExpr =
816	cast<ObjCMessageExpr>(Val: msg.get()->IgnoreImplicit());
817	Expr *arg = msgExpr->getArg(Arg: 0);
818	if (CanCaptureValue(exp: arg))
819	msgExpr->setArg(Arg: 0, ArgExpr: captureValueAsResult(arg));
820	}
821
822	return msg;
823	}
824
825	/// @property-specific behavior for doing lvalue-to-rvalue conversion.
826	ExprResult ObjCPropertyOpBuilder::buildRValueOperation(Expr *op) {
827	// Explicit properties always have getters, but implicit ones don't.
828	// Check that before proceeding.
829	if (RefExpr->isImplicitProperty() && !RefExpr->getImplicitPropertyGetter()) {
830	S.Diag(RefExpr->getLocation(), diag::err_getter_not_found)
831	<< RefExpr->getSourceRange();
832	return ExprError();
833	}
834
835	ExprResult result = PseudoOpBuilder::buildRValueOperation(op);
836	if (result.isInvalid()) return ExprError();
837
838	if (RefExpr->isExplicitProperty() && !Getter->hasRelatedResultType())
839	S.ObjC().DiagnosePropertyAccessorMismatch(PD: RefExpr->getExplicitProperty(),
840	Getter, Loc: RefExpr->getLocation());
841
842	// As a special case, if the method returns 'id', try to get
843	// a better type from the property.
844	if (RefExpr->isExplicitProperty() && result.get()->isPRValue()) {
845	QualType receiverType = RefExpr->getReceiverType(ctx: S.Context);
846	QualType propType = RefExpr->getExplicitProperty()
847	->getUsageType(objectType: receiverType);
848	if (result.get()->getType()->isObjCIdType()) {
849	if (const ObjCObjectPointerType *ptr
850	= propType->getAs<ObjCObjectPointerType>()) {
851	if (!ptr->isObjCIdType())
852	result = S.ImpCastExprToType(E: result.get(), Type: propType, CK: CK_BitCast);
853	}
854	}
855	if (propType.getObjCLifetime() == Qualifiers::OCL_Weak &&
856	!S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
857	RefExpr->getLocation()))
858	S.getCurFunction()->markSafeWeakUse(RefExpr);
859	}
860
861	return result;
862	}
863
864	/// Try to build this as a call to a getter that returns a reference.
865	///
866	/// \return true if it was possible, whether or not it actually
867	/// succeeded
868	bool ObjCPropertyOpBuilder::tryBuildGetOfReference(Expr *op,
869	ExprResult &result) {
870	if (!S.getLangOpts().CPlusPlus) return false;
871
872	findGetter();
873	if (!Getter) {
874	// The property has no setter and no getter! This can happen if the type is
875	// invalid. Error have already been reported.
876	result = ExprError();
877	return true;
878	}
879
880	// Only do this if the getter returns an l-value reference type.
881	QualType resultType = Getter->getReturnType();
882	if (!resultType->isLValueReferenceType()) return false;
883
884	result = buildRValueOperation(op);
885	return true;
886	}
887
888	/// @property-specific behavior for doing assignments.
889	ExprResult
890	ObjCPropertyOpBuilder::buildAssignmentOperation(Scope *Sc,
891	SourceLocation opcLoc,
892	BinaryOperatorKind opcode,
893	Expr *LHS, Expr *RHS) {
894	assert(BinaryOperator::isAssignmentOp(opcode));
895
896	// If there's no setter, we have no choice but to try to assign to
897	// the result of the getter.
898	if (!findSetter()) {
899	ExprResult result;
900	if (tryBuildGetOfReference(op: LHS, result)) {
901	if (result.isInvalid()) return ExprError();
902	return S.BuildBinOp(S: Sc, OpLoc: opcLoc, Opc: opcode, LHSExpr: result.get(), RHSExpr: RHS);
903	}
904
905	// Otherwise, it's an error.
906	S.Diag(opcLoc, diag::err_nosetter_property_assignment)
907	<< unsigned(RefExpr->isImplicitProperty())
908	<< SetterSelector
909	<< LHS->getSourceRange() << RHS->getSourceRange();
910	return ExprError();
911	}
912
913	// If there is a setter, we definitely want to use it.
914
915	// Verify that we can do a compound assignment.
916	if (opcode != BO_Assign && !findGetter()) {
917	S.Diag(opcLoc, diag::err_nogetter_property_compound_assignment)
918	<< LHS->getSourceRange() << RHS->getSourceRange();
919	return ExprError();
920	}
921
922	ExprResult result =
923	PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
924	if (result.isInvalid()) return ExprError();
925
926	// Various warnings about property assignments in ARC.
927	if (S.getLangOpts().ObjCAutoRefCount && InstanceReceiver) {
928	S.ObjC().checkRetainCycles(receiver: InstanceReceiver->getSourceExpr(), argument: RHS);
929	S.checkUnsafeExprAssigns(Loc: opcLoc, LHS, RHS);
930	}
931
932	return result;
933	}
934
935	/// @property-specific behavior for doing increments and decrements.
936	ExprResult
937	ObjCPropertyOpBuilder::buildIncDecOperation(Scope *Sc, SourceLocation opcLoc,
938	UnaryOperatorKind opcode,
939	Expr *op) {
940	// If there's no setter, we have no choice but to try to assign to
941	// the result of the getter.
942	if (!findSetter()) {
943	ExprResult result;
944	if (tryBuildGetOfReference(op, result)) {
945	if (result.isInvalid()) return ExprError();
946	return S.BuildUnaryOp(S: Sc, OpLoc: opcLoc, Opc: opcode, Input: result.get());
947	}
948
949	// Otherwise, it's an error.
950	S.Diag(opcLoc, diag::err_nosetter_property_incdec)
951	<< unsigned(RefExpr->isImplicitProperty())
952	<< unsigned(UnaryOperator::isDecrementOp(opcode))
953	<< SetterSelector
954	<< op->getSourceRange();
955	return ExprError();
956	}
957
958	// If there is a setter, we definitely want to use it.
959
960	// We also need a getter.
961	if (!findGetter()) {
962	assert(RefExpr->isImplicitProperty());
963	S.Diag(opcLoc, diag::err_nogetter_property_incdec)
964	<< unsigned(UnaryOperator::isDecrementOp(opcode))
965	<< GetterSelector
966	<< op->getSourceRange();
967	return ExprError();
968	}
969
970	return PseudoOpBuilder::buildIncDecOperation(Sc, opcLoc, opcode, op);
971	}
972
973	ExprResult ObjCPropertyOpBuilder::complete(Expr *SyntacticForm) {
974	if (isWeakProperty() && !S.isUnevaluatedContext() &&
975	!S.Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
976	SyntacticForm->getBeginLoc()))
977	S.getCurFunction()->recordUseOfWeak(E: SyntacticRefExpr,
978	IsRead: SyntacticRefExpr->isMessagingGetter());
979
980	return PseudoOpBuilder::complete(SyntacticForm);
981	}
982
983	// ObjCSubscript build stuff.
984	//
985
986	/// objective-c subscripting-specific behavior for doing lvalue-to-rvalue
987	/// conversion.
988	/// FIXME. Remove this routine if it is proven that no additional
989	/// specifity is needed.
990	ExprResult ObjCSubscriptOpBuilder::buildRValueOperation(Expr *op) {
991	ExprResult result = PseudoOpBuilder::buildRValueOperation(op);
992	if (result.isInvalid()) return ExprError();
993	return result;
994	}
995
996	/// objective-c subscripting-specific behavior for doing assignments.
997	ExprResult
998	ObjCSubscriptOpBuilder::buildAssignmentOperation(Scope *Sc,
999	SourceLocation opcLoc,
1000	BinaryOperatorKind opcode,
1001	Expr *LHS, Expr *RHS) {
1002	assert(BinaryOperator::isAssignmentOp(opcode));
1003	// There must be a method to do the Index'ed assignment.
1004	if (!findAtIndexSetter())
1005	return ExprError();
1006
1007	// Verify that we can do a compound assignment.
1008	if (opcode != BO_Assign && !findAtIndexGetter())
1009	return ExprError();
1010
1011	ExprResult result =
1012	PseudoOpBuilder::buildAssignmentOperation(Sc, opcLoc, opcode, LHS, RHS);
1013	if (result.isInvalid()) return ExprError();
1014
1015	// Various warnings about objc Index'ed assignments in ARC.
1016	if (S.getLangOpts().ObjCAutoRefCount && InstanceBase) {
1017	S.ObjC().checkRetainCycles(receiver: InstanceBase->getSourceExpr(), argument: RHS);
1018	S.checkUnsafeExprAssigns(Loc: opcLoc, LHS, RHS);
1019	}
1020
1021	return result;
1022	}
1023
1024	/// Capture the base object of an Objective-C Index'ed expression.
1025	Expr *ObjCSubscriptOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1026	assert(InstanceBase == nullptr);
1027
1028	// Capture base expression in an OVE and rebuild the syntactic
1029	// form to use the OVE as its base expression.
1030	InstanceBase = capture(RefExpr->getBaseExpr());
1031	InstanceKey = capture(RefExpr->getKeyExpr());
1032
1033	syntacticBase =
1034	Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1035	switch (Idx) {
1036	case 0:
1037	return InstanceBase;
1038	case 1:
1039	return InstanceKey;
1040	default:
1041	llvm_unreachable("Unexpected index for ObjCSubscriptExpr");
1042	}
1043	}).rebuild(e: syntacticBase);
1044
1045	return syntacticBase;
1046	}
1047
1048	/// CheckKeyForObjCARCConversion - This routine suggests bridge casting of CF
1049	/// objects used as dictionary subscript key objects.
1050	static void CheckKeyForObjCARCConversion(Sema &S, QualType ContainerT,
1051	Expr *Key) {
1052	if (ContainerT.isNull())
1053	return;
1054	// dictionary subscripting.
1055	// - (id)objectForKeyedSubscript:(id)key;
1056	const IdentifierInfo *KeyIdents[] = {
1057	&S.Context.Idents.get(Name: "objectForKeyedSubscript")};
1058	Selector GetterSelector = S.Context.Selectors.getSelector(NumArgs: 1, IIV: KeyIdents);
1059	ObjCMethodDecl *Getter = S.ObjC().LookupMethodInObjectType(
1060	Sel: GetterSelector, Ty: ContainerT, IsInstance: true /*instance*/);
1061	if (!Getter)
1062	return;
1063	QualType T = Getter->parameters()[0]->getType();
1064	S.ObjC().CheckObjCConversion(castRange: Key->getSourceRange(), castType: T, op&: Key,
1065	CCK: CheckedConversionKind::Implicit);
1066	}
1067
1068	bool ObjCSubscriptOpBuilder::findAtIndexGetter() {
1069	if (AtIndexGetter)
1070	return true;
1071
1072	Expr *BaseExpr = RefExpr->getBaseExpr();
1073	QualType BaseT = BaseExpr->getType();
1074
1075	QualType ResultType;
1076	if (const ObjCObjectPointerType *PTy =
1077	BaseT->getAs<ObjCObjectPointerType>()) {
1078	ResultType = PTy->getPointeeType();
1079	}
1080	SemaObjC::ObjCSubscriptKind Res =
1081	S.ObjC().CheckSubscriptingKind(FromE: RefExpr->getKeyExpr());
1082	if (Res == SemaObjC::OS_Error) {
1083	if (S.getLangOpts().ObjCAutoRefCount)
1084	CheckKeyForObjCARCConversion(S, ContainerT: ResultType,
1085	Key: RefExpr->getKeyExpr());
1086	return false;
1087	}
1088	bool arrayRef = (Res == SemaObjC::OS_Array);
1089
1090	if (ResultType.isNull()) {
1091	S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1092	<< BaseExpr->getType() << arrayRef;
1093	return false;
1094	}
1095	if (!arrayRef) {
1096	// dictionary subscripting.
1097	// - (id)objectForKeyedSubscript:(id)key;
1098	const IdentifierInfo *KeyIdents[] = {
1099	&S.Context.Idents.get(Name: "objectForKeyedSubscript")};
1100	AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1101	}
1102	else {
1103	// - (id)objectAtIndexedSubscript:(size_t)index;
1104	const IdentifierInfo *KeyIdents[] = {
1105	&S.Context.Idents.get(Name: "objectAtIndexedSubscript")};
1106
1107	AtIndexGetterSelector = S.Context.Selectors.getSelector(1, KeyIdents);
1108	}
1109
1110	AtIndexGetter = S.ObjC().LookupMethodInObjectType(
1111	AtIndexGetterSelector, ResultType, true /*instance*/);
1112
1113	if (!AtIndexGetter && S.getLangOpts().DebuggerObjCLiteral) {
1114	AtIndexGetter = ObjCMethodDecl::Create(
1115	S.Context, SourceLocation(), SourceLocation(), AtIndexGetterSelector,
1116	S.Context.getObjCIdType() /*ReturnType*/, nullptr /*TypeSourceInfo */,
1117	S.Context.getTranslationUnitDecl(), true /*Instance*/,
1118	false /*isVariadic*/,
1119	/*isPropertyAccessor=*/false,
1120	/*isSynthesizedAccessorStub=*/false,
1121	/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
1122	ObjCImplementationControl::Required, false);
1123	ParmVarDecl *Argument = ParmVarDecl::Create(C&: S.Context, DC: AtIndexGetter,
1124	StartLoc: SourceLocation(), IdLoc: SourceLocation(),
1125	Id: arrayRef ? &S.Context.Idents.get(Name: "index")
1126	: &S.Context.Idents.get(Name: "key"),
1127	T: arrayRef ? S.Context.UnsignedLongTy
1128	: S.Context.getObjCIdType(),
1129	/*TInfo=*/nullptr,
1130	S: SC_None,
1131	DefArg: nullptr);
1132	AtIndexGetter->setMethodParams(C&: S.Context, Params: Argument, SelLocs: {});
1133	}
1134
1135	if (!AtIndexGetter) {
1136	if (!BaseT->isObjCIdType()) {
1137	S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_method_not_found)
1138	<< BaseExpr->getType() << 0 << arrayRef;
1139	return false;
1140	}
1141	AtIndexGetter = S.ObjC().LookupInstanceMethodInGlobalPool(
1142	AtIndexGetterSelector, RefExpr->getSourceRange(), true);
1143	}
1144
1145	if (AtIndexGetter) {
1146	QualType T = AtIndexGetter->parameters()[0]->getType();
1147	if ((arrayRef && !T->isIntegralOrEnumerationType()) ||
1148	(!arrayRef && !T->isObjCObjectPointerType())) {
1149	S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1150	arrayRef ? diag::err_objc_subscript_index_type
1151	: diag::err_objc_subscript_key_type) << T;
1152	S.Diag(AtIndexGetter->parameters()[0]->getLocation(),
1153	diag::note_parameter_type) << T;
1154	return false;
1155	}
1156	QualType R = AtIndexGetter->getReturnType();
1157	if (!R->isObjCObjectPointerType()) {
1158	S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1159	diag::err_objc_indexing_method_result_type) << R << arrayRef;
1160	S.Diag(AtIndexGetter->getLocation(), diag::note_method_declared_at) <<
1161	AtIndexGetter->getDeclName();
1162	}
1163	}
1164	return true;
1165	}
1166
1167	bool ObjCSubscriptOpBuilder::findAtIndexSetter() {
1168	if (AtIndexSetter)
1169	return true;
1170
1171	Expr *BaseExpr = RefExpr->getBaseExpr();
1172	QualType BaseT = BaseExpr->getType();
1173
1174	QualType ResultType;
1175	if (const ObjCObjectPointerType *PTy =
1176	BaseT->getAs<ObjCObjectPointerType>()) {
1177	ResultType = PTy->getPointeeType();
1178	}
1179
1180	SemaObjC::ObjCSubscriptKind Res =
1181	S.ObjC().CheckSubscriptingKind(FromE: RefExpr->getKeyExpr());
1182	if (Res == SemaObjC::OS_Error) {
1183	if (S.getLangOpts().ObjCAutoRefCount)
1184	CheckKeyForObjCARCConversion(S, ContainerT: ResultType,
1185	Key: RefExpr->getKeyExpr());
1186	return false;
1187	}
1188	bool arrayRef = (Res == SemaObjC::OS_Array);
1189
1190	if (ResultType.isNull()) {
1191	S.Diag(BaseExpr->getExprLoc(), diag::err_objc_subscript_base_type)
1192	<< BaseExpr->getType() << arrayRef;
1193	return false;
1194	}
1195
1196	if (!arrayRef) {
1197	// dictionary subscripting.
1198	// - (void)setObject:(id)object forKeyedSubscript:(id)key;
1199	const IdentifierInfo *KeyIdents[] = {
1200	&S.Context.Idents.get(Name: "setObject"),
1201	&S.Context.Idents.get(Name: "forKeyedSubscript")};
1202	AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1203	}
1204	else {
1205	// - (void)setObject:(id)object atIndexedSubscript:(NSInteger)index;
1206	const IdentifierInfo *KeyIdents[] = {
1207	&S.Context.Idents.get(Name: "setObject"),
1208	&S.Context.Idents.get(Name: "atIndexedSubscript")};
1209	AtIndexSetterSelector = S.Context.Selectors.getSelector(2, KeyIdents);
1210	}
1211	AtIndexSetter = S.ObjC().LookupMethodInObjectType(
1212	AtIndexSetterSelector, ResultType, true /*instance*/);
1213
1214	if (!AtIndexSetter && S.getLangOpts().DebuggerObjCLiteral) {
1215	TypeSourceInfo *ReturnTInfo = nullptr;
1216	QualType ReturnType = S.Context.VoidTy;
1217	AtIndexSetter = ObjCMethodDecl::Create(
1218	S.Context, SourceLocation(), SourceLocation(), AtIndexSetterSelector,
1219	ReturnType, ReturnTInfo, S.Context.getTranslationUnitDecl(),
1220	true /*Instance*/, false /*isVariadic*/,
1221	/*isPropertyAccessor=*/false,
1222	/*isSynthesizedAccessorStub=*/false,
1223	/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
1224	ObjCImplementationControl::Required, false);
1225	SmallVector<ParmVarDecl *, 2> Params;
1226	ParmVarDecl *object = ParmVarDecl::Create(S.Context, AtIndexSetter,
1227	SourceLocation(), SourceLocation(),
1228	&S.Context.Idents.get(Name: "object"),
1229	S.Context.getObjCIdType(),
1230	/*TInfo=*/nullptr,
1231	SC_None,
1232	nullptr);
1233	Params.push_back(Elt: object);
1234	ParmVarDecl *key = ParmVarDecl::Create(C&: S.Context, DC: AtIndexSetter,
1235	StartLoc: SourceLocation(), IdLoc: SourceLocation(),
1236	Id: arrayRef ? &S.Context.Idents.get(Name: "index")
1237	: &S.Context.Idents.get(Name: "key"),
1238	T: arrayRef ? S.Context.UnsignedLongTy
1239	: S.Context.getObjCIdType(),
1240	/*TInfo=*/nullptr,
1241	S: SC_None,
1242	DefArg: nullptr);
1243	Params.push_back(Elt: key);
1244	AtIndexSetter->setMethodParams(C&: S.Context, Params, SelLocs: {});
1245	}
1246
1247	if (!AtIndexSetter) {
1248	if (!BaseT->isObjCIdType()) {
1249	S.Diag(BaseExpr->getExprLoc(),
1250	diag::err_objc_subscript_method_not_found)
1251	<< BaseExpr->getType() << 1 << arrayRef;
1252	return false;
1253	}
1254	AtIndexSetter = S.ObjC().LookupInstanceMethodInGlobalPool(
1255	AtIndexSetterSelector, RefExpr->getSourceRange(), true);
1256	}
1257
1258	bool err = false;
1259	if (AtIndexSetter && arrayRef) {
1260	QualType T = AtIndexSetter->parameters()[1]->getType();
1261	if (!T->isIntegralOrEnumerationType()) {
1262	S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1263	diag::err_objc_subscript_index_type) << T;
1264	S.Diag(AtIndexSetter->parameters()[1]->getLocation(),
1265	diag::note_parameter_type) << T;
1266	err = true;
1267	}
1268	T = AtIndexSetter->parameters()[0]->getType();
1269	if (!T->isObjCObjectPointerType()) {
1270	S.Diag(RefExpr->getBaseExpr()->getExprLoc(),
1271	diag::err_objc_subscript_object_type) << T << arrayRef;
1272	S.Diag(AtIndexSetter->parameters()[0]->getLocation(),
1273	diag::note_parameter_type) << T;
1274	err = true;
1275	}
1276	}
1277	else if (AtIndexSetter && !arrayRef)
1278	for (unsigned i=0; i <2; i++) {
1279	QualType T = AtIndexSetter->parameters()[i]->getType();
1280	if (!T->isObjCObjectPointerType()) {
1281	if (i == 1)
1282	S.Diag(RefExpr->getKeyExpr()->getExprLoc(),
1283	diag::err_objc_subscript_key_type) << T;
1284	else
1285	S.Diag(RefExpr->getBaseExpr()->getExprLoc(),
1286	diag::err_objc_subscript_dic_object_type) << T;
1287	S.Diag(AtIndexSetter->parameters()[i]->getLocation(),
1288	diag::note_parameter_type) << T;
1289	err = true;
1290	}
1291	}
1292
1293	return !err;
1294	}
1295
1296	// Get the object at "Index" position in the container.
1297	// [BaseExpr objectAtIndexedSubscript : IndexExpr];
1298	ExprResult ObjCSubscriptOpBuilder::buildGet() {
1299	if (!findAtIndexGetter())
1300	return ExprError();
1301
1302	QualType receiverType = InstanceBase->getType();
1303
1304	// Build a message-send.
1305	ExprResult msg;
1306	Expr *Index = InstanceKey;
1307
1308	// Arguments.
1309	Expr *args[] = { Index };
1310	assert(InstanceBase);
1311	if (AtIndexGetter)
1312	S.DiagnoseUseOfDecl(AtIndexGetter, GenericLoc);
1313	msg = S.ObjC().BuildInstanceMessageImplicit(
1314	InstanceBase, receiverType, GenericLoc, AtIndexGetterSelector,
1315	AtIndexGetter, MultiExprArg(args, 1));
1316	return msg;
1317	}
1318
1319	/// Store into the container the "op" object at "Index"'ed location
1320	/// by building this messaging expression:
1321	/// - (void)setObject:(id)object atIndexedSubscript:(NSInteger)index;
1322	/// \param captureSetValueAsResult If true, capture the actual
1323	/// value being set as the value of the property operation.
1324	ExprResult ObjCSubscriptOpBuilder::buildSet(Expr *op, SourceLocation opcLoc,
1325	bool captureSetValueAsResult) {
1326	if (!findAtIndexSetter())
1327	return ExprError();
1328	if (AtIndexSetter)
1329	S.DiagnoseUseOfDecl(AtIndexSetter, GenericLoc);
1330	QualType receiverType = InstanceBase->getType();
1331	Expr *Index = InstanceKey;
1332
1333	// Arguments.
1334	Expr *args[] = { op, Index };
1335
1336	// Build a message-send.
1337	ExprResult msg = S.ObjC().BuildInstanceMessageImplicit(
1338	InstanceBase, receiverType, GenericLoc, AtIndexSetterSelector,
1339	AtIndexSetter, MultiExprArg(args, 2));
1340
1341	if (!msg.isInvalid() && captureSetValueAsResult) {
1342	ObjCMessageExpr *msgExpr =
1343	cast<ObjCMessageExpr>(Val: msg.get()->IgnoreImplicit());
1344	Expr *arg = msgExpr->getArg(Arg: 0);
1345	if (CanCaptureValue(exp: arg))
1346	msgExpr->setArg(Arg: 0, ArgExpr: captureValueAsResult(arg));
1347	}
1348
1349	return msg;
1350	}
1351
1352	//===----------------------------------------------------------------------===//
1353	// MSVC __declspec(property) references
1354	//===----------------------------------------------------------------------===//
1355
1356	MSPropertyRefExpr *
1357	MSPropertyOpBuilder::getBaseMSProperty(MSPropertySubscriptExpr *E) {
1358	CallArgs.insert(I: CallArgs.begin(), Elt: E->getIdx());
1359	Expr *Base = E->getBase()->IgnoreParens();
1360	while (auto *MSPropSubscript = dyn_cast<MSPropertySubscriptExpr>(Val: Base)) {
1361	CallArgs.insert(I: CallArgs.begin(), Elt: MSPropSubscript->getIdx());
1362	Base = MSPropSubscript->getBase()->IgnoreParens();
1363	}
1364	return cast<MSPropertyRefExpr>(Val: Base);
1365	}
1366
1367	Expr *MSPropertyOpBuilder::rebuildAndCaptureObject(Expr *syntacticBase) {
1368	InstanceBase = capture(e: RefExpr->getBaseExpr());
1369	for (Expr *&Arg : CallArgs)
1370	Arg = capture(e: Arg);
1371	syntacticBase = Rebuilder(S, [=](Expr *, unsigned Idx) -> Expr * {
1372	switch (Idx) {
1373	case 0:
1374	return InstanceBase;
1375	default:
1376	assert(Idx <= CallArgs.size());
1377	return CallArgs[Idx - 1];
1378	}
1379	}).rebuild(e: syntacticBase);
1380
1381	return syntacticBase;
1382	}
1383
1384	ExprResult MSPropertyOpBuilder::buildGet() {
1385	if (!RefExpr->getPropertyDecl()->hasGetter()) {
1386	S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1387	<< 0 /* getter */ << RefExpr->getPropertyDecl();
1388	return ExprError();
1389	}
1390
1391	UnqualifiedId GetterName;
1392	const IdentifierInfo *II = RefExpr->getPropertyDecl()->getGetterId();
1393	GetterName.setIdentifier(Id: II, IdLoc: RefExpr->getMemberLoc());
1394	CXXScopeSpec SS;
1395	SS.Adopt(Other: RefExpr->getQualifierLoc());
1396	ExprResult GetterExpr =
1397	S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1398	RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1399	SourceLocation(), GetterName, nullptr);
1400	if (GetterExpr.isInvalid()) {
1401	S.Diag(RefExpr->getMemberLoc(),
1402	diag::err_cannot_find_suitable_accessor) << 0 /* getter */
1403	<< RefExpr->getPropertyDecl();
1404	return ExprError();
1405	}
1406
1407	return S.BuildCallExpr(S: S.getCurScope(), Fn: GetterExpr.get(),
1408	LParenLoc: RefExpr->getSourceRange().getBegin(), ArgExprs: CallArgs,
1409	RParenLoc: RefExpr->getSourceRange().getEnd());
1410	}
1411
1412	ExprResult MSPropertyOpBuilder::buildSet(Expr *op, SourceLocation sl,
1413	bool captureSetValueAsResult) {
1414	if (!RefExpr->getPropertyDecl()->hasSetter()) {
1415	S.Diag(RefExpr->getMemberLoc(), diag::err_no_accessor_for_property)
1416	<< 1 /* setter */ << RefExpr->getPropertyDecl();
1417	return ExprError();
1418	}
1419
1420	UnqualifiedId SetterName;
1421	const IdentifierInfo *II = RefExpr->getPropertyDecl()->getSetterId();
1422	SetterName.setIdentifier(Id: II, IdLoc: RefExpr->getMemberLoc());
1423	CXXScopeSpec SS;
1424	SS.Adopt(Other: RefExpr->getQualifierLoc());
1425	ExprResult SetterExpr =
1426	S.ActOnMemberAccessExpr(S.getCurScope(), InstanceBase, SourceLocation(),
1427	RefExpr->isArrow() ? tok::arrow : tok::period, SS,
1428	SourceLocation(), SetterName, nullptr);
1429	if (SetterExpr.isInvalid()) {
1430	S.Diag(RefExpr->getMemberLoc(),
1431	diag::err_cannot_find_suitable_accessor) << 1 /* setter */
1432	<< RefExpr->getPropertyDecl();
1433	return ExprError();
1434	}
1435
1436	SmallVector<Expr*, 4> ArgExprs;
1437	ArgExprs.append(in_start: CallArgs.begin(), in_end: CallArgs.end());
1438	ArgExprs.push_back(Elt: op);
1439	return S.BuildCallExpr(S: S.getCurScope(), Fn: SetterExpr.get(),
1440	LParenLoc: RefExpr->getSourceRange().getBegin(), ArgExprs,
1441	RParenLoc: op->getSourceRange().getEnd());
1442	}
1443
1444	//===----------------------------------------------------------------------===//
1445	// General Sema routines.
1446	//===----------------------------------------------------------------------===//
1447
1448	ExprResult SemaPseudoObject::checkRValue(Expr *E) {
1449	Expr *opaqueRef = E->IgnoreParens();
1450	if (ObjCPropertyRefExpr *refExpr
1451	= dyn_cast<ObjCPropertyRefExpr>(Val: opaqueRef)) {
1452	ObjCPropertyOpBuilder builder(SemaRef, refExpr, true);
1453	return builder.buildRValueOperation(op: E);
1454	}
1455	else if (ObjCSubscriptRefExpr *refExpr
1456	= dyn_cast<ObjCSubscriptRefExpr>(Val: opaqueRef)) {
1457	ObjCSubscriptOpBuilder builder(SemaRef, refExpr, true);
1458	return builder.buildRValueOperation(op: E);
1459	} else if (MSPropertyRefExpr *refExpr
1460	= dyn_cast<MSPropertyRefExpr>(Val: opaqueRef)) {
1461	MSPropertyOpBuilder builder(SemaRef, refExpr, true);
1462	return builder.buildRValueOperation(op: E);
1463	} else if (MSPropertySubscriptExpr *RefExpr =
1464	dyn_cast<MSPropertySubscriptExpr>(Val: opaqueRef)) {
1465	MSPropertyOpBuilder Builder(SemaRef, RefExpr, true);
1466	return Builder.buildRValueOperation(op: E);
1467	} else {
1468	llvm_unreachable("unknown pseudo-object kind!");
1469	}
1470	}
1471
1472	/// Check an increment or decrement of a pseudo-object expression.
1473	ExprResult SemaPseudoObject::checkIncDec(Scope *Sc, SourceLocation opcLoc,
1474	UnaryOperatorKind opcode, Expr *op) {
1475	// Do nothing if the operand is dependent.
1476	if (op->isTypeDependent())
1477	return UnaryOperator::Create(
1478	C: SemaRef.Context, input: op, opc: opcode, type: SemaRef.Context.DependentTy, VK: VK_PRValue,
1479	OK: OK_Ordinary, l: opcLoc, CanOverflow: false, FPFeatures: SemaRef.CurFPFeatureOverrides());
1480
1481	assert(UnaryOperator::isIncrementDecrementOp(opcode));
1482	Expr *opaqueRef = op->IgnoreParens();
1483	if (ObjCPropertyRefExpr *refExpr
1484	= dyn_cast<ObjCPropertyRefExpr>(Val: opaqueRef)) {
1485	ObjCPropertyOpBuilder builder(SemaRef, refExpr, false);
1486	return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1487	} else if (isa<ObjCSubscriptRefExpr>(Val: opaqueRef)) {
1488	Diag(opcLoc, diag::err_illegal_container_subscripting_op);
1489	return ExprError();
1490	} else if (MSPropertyRefExpr *refExpr
1491	= dyn_cast<MSPropertyRefExpr>(Val: opaqueRef)) {
1492	MSPropertyOpBuilder builder(SemaRef, refExpr, false);
1493	return builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1494	} else if (MSPropertySubscriptExpr *RefExpr
1495	= dyn_cast<MSPropertySubscriptExpr>(Val: opaqueRef)) {
1496	MSPropertyOpBuilder Builder(SemaRef, RefExpr, false);
1497	return Builder.buildIncDecOperation(Sc, opcLoc, opcode, op);
1498	} else {
1499	llvm_unreachable("unknown pseudo-object kind!");
1500	}
1501	}
1502
1503	ExprResult SemaPseudoObject::checkAssignment(Scope *S, SourceLocation opcLoc,
1504	BinaryOperatorKind opcode,
1505	Expr *LHS, Expr *RHS) {
1506	// Do nothing if either argument is dependent.
1507	if (LHS->isTypeDependent() || RHS->isTypeDependent())
1508	return BinaryOperator::Create(
1509	C: SemaRef.Context, lhs: LHS, rhs: RHS, opc: opcode, ResTy: SemaRef.Context.DependentTy,
1510	VK: VK_PRValue, OK: OK_Ordinary, opLoc: opcLoc, FPFeatures: SemaRef.CurFPFeatureOverrides());
1511
1512	// Filter out non-overload placeholder types in the RHS.
1513	if (RHS->getType()->isNonOverloadPlaceholderType()) {
1514	ExprResult result = SemaRef.CheckPlaceholderExpr(E: RHS);
1515	if (result.isInvalid()) return ExprError();
1516	RHS = result.get();
1517	}
1518
1519	bool IsSimpleAssign = opcode == BO_Assign;
1520	Expr *opaqueRef = LHS->IgnoreParens();
1521	if (ObjCPropertyRefExpr *refExpr
1522	= dyn_cast<ObjCPropertyRefExpr>(Val: opaqueRef)) {
1523	ObjCPropertyOpBuilder builder(SemaRef, refExpr, IsSimpleAssign);
1524	return builder.buildAssignmentOperation(Sc: S, opcLoc, opcode, LHS, RHS);
1525	} else if (ObjCSubscriptRefExpr *refExpr
1526	= dyn_cast<ObjCSubscriptRefExpr>(Val: opaqueRef)) {
1527	ObjCSubscriptOpBuilder builder(SemaRef, refExpr, IsSimpleAssign);
1528	return builder.buildAssignmentOperation(Sc: S, opcLoc, opcode, LHS, RHS);
1529	} else if (MSPropertyRefExpr *refExpr
1530	= dyn_cast<MSPropertyRefExpr>(Val: opaqueRef)) {
1531	MSPropertyOpBuilder builder(SemaRef, refExpr, IsSimpleAssign);
1532	return builder.buildAssignmentOperation(Sc: S, opcLoc, opcode, LHS, RHS);
1533	} else if (MSPropertySubscriptExpr *RefExpr
1534	= dyn_cast<MSPropertySubscriptExpr>(Val: opaqueRef)) {
1535	MSPropertyOpBuilder Builder(SemaRef, RefExpr, IsSimpleAssign);
1536	return Builder.buildAssignmentOperation(Sc: S, opcLoc, opcode, LHS, RHS);
1537	} else {
1538	llvm_unreachable("unknown pseudo-object kind!");
1539	}
1540	}
1541
1542	/// Given a pseudo-object reference, rebuild it without the opaque
1543	/// values. Basically, undo the behavior of rebuildAndCaptureObject.
1544	/// This should never operate in-place.
1545	static Expr *stripOpaqueValuesFromPseudoObjectRef(Sema &S, Expr *E) {
1546	return Rebuilder(S,
1547	[=](Expr *E, unsigned) -> Expr * {
1548	return cast<OpaqueValueExpr>(Val: E)->getSourceExpr();
1549	})
1550	.rebuild(e: E);
1551	}
1552
1553	/// Given a pseudo-object expression, recreate what it looks like
1554	/// syntactically without the attendant OpaqueValueExprs.
1555	///
1556	/// This is a hack which should be removed when TreeTransform is
1557	/// capable of rebuilding a tree without stripping implicit
1558	/// operations.
1559	Expr *SemaPseudoObject::recreateSyntacticForm(PseudoObjectExpr *E) {
1560	Expr *syntax = E->getSyntacticForm();
1561	if (UnaryOperator *uop = dyn_cast<UnaryOperator>(Val: syntax)) {
1562	Expr *op = stripOpaqueValuesFromPseudoObjectRef(S&: SemaRef, E: uop->getSubExpr());
1563	return UnaryOperator::Create(
1564	C: SemaRef.Context, input: op, opc: uop->getOpcode(), type: uop->getType(),
1565	VK: uop->getValueKind(), OK: uop->getObjectKind(), l: uop->getOperatorLoc(),
1566	CanOverflow: uop->canOverflow(), FPFeatures: SemaRef.CurFPFeatureOverrides());
1567	} else if (CompoundAssignOperator *cop
1568	= dyn_cast<CompoundAssignOperator>(Val: syntax)) {
1569	Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(SemaRef, cop->getLHS());
1570	Expr *rhs = cast<OpaqueValueExpr>(cop->getRHS())->getSourceExpr();
1571	return CompoundAssignOperator::Create(
1572	C: SemaRef.Context, lhs, rhs, opc: cop->getOpcode(), ResTy: cop->getType(),
1573	VK: cop->getValueKind(), OK: cop->getObjectKind(), opLoc: cop->getOperatorLoc(),
1574	FPFeatures: SemaRef.CurFPFeatureOverrides(), CompLHSType: cop->getComputationLHSType(),
1575	CompResultType: cop->getComputationResultType());
1576
1577	} else if (BinaryOperator *bop = dyn_cast<BinaryOperator>(Val: syntax)) {
1578	Expr *lhs = stripOpaqueValuesFromPseudoObjectRef(S&: SemaRef, E: bop->getLHS());
1579	Expr *rhs = cast<OpaqueValueExpr>(Val: bop->getRHS())->getSourceExpr();
1580	return BinaryOperator::Create(C: SemaRef.Context, lhs, rhs, opc: bop->getOpcode(),
1581	ResTy: bop->getType(), VK: bop->getValueKind(),
1582	OK: bop->getObjectKind(), opLoc: bop->getOperatorLoc(),
1583	FPFeatures: SemaRef.CurFPFeatureOverrides());
1584
1585	} else if (isa<CallExpr>(Val: syntax)) {
1586	return syntax;
1587	} else {
1588	assert(syntax->hasPlaceholderType(BuiltinType::PseudoObject));
1589	return stripOpaqueValuesFromPseudoObjectRef(S&: SemaRef, E: syntax);
1590	}
1591	}
1592
1593	SemaPseudoObject::SemaPseudoObject(Sema &S) : SemaBase(S) {}
1594