1	//===-- RewriteModernObjC.cpp - Playground for the code rewriter ----------===//
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	// Hacks and fun related to the code rewriter.
10	//
11	//===----------------------------------------------------------------------===//
12
13	#include "clang/Rewrite/Frontend/ASTConsumers.h"
14	#include "clang/AST/AST.h"
15	#include "clang/AST/ASTConsumer.h"
16	#include "clang/AST/Attr.h"
17	#include "clang/AST/ParentMap.h"
18	#include "clang/Basic/CharInfo.h"
19	#include "clang/Basic/Diagnostic.h"
20	#include "clang/Basic/IdentifierTable.h"
21	#include "clang/Basic/SourceManager.h"
22	#include "clang/Basic/TargetInfo.h"
23	#include "clang/Config/config.h"
24	#include "clang/Lex/Lexer.h"
25	#include "clang/Rewrite/Core/Rewriter.h"
26	#include "llvm/ADT/DenseSet.h"
27	#include "llvm/ADT/SetVector.h"
28	#include "llvm/ADT/SmallPtrSet.h"
29	#include "llvm/ADT/StringExtras.h"
30	#include "llvm/Support/MemoryBuffer.h"
31	#include "llvm/Support/raw_ostream.h"
32	#include <memory>
33
34	#if CLANG_ENABLE_OBJC_REWRITER
35
36	using namespace clang;
37	using llvm::utostr;
38
39	namespace {
40	class RewriteModernObjC : public ASTConsumer {
41	protected:
42
43	enum {
44	BLOCK_FIELD_IS_OBJECT = 3, /* id, NSObject, __attribute__((NSObject)),
45	block, ... */
46	BLOCK_FIELD_IS_BLOCK = 7, /* a block variable */
47	BLOCK_FIELD_IS_BYREF = 8, /* the on stack structure holding the
48	__block variable */
49	BLOCK_FIELD_IS_WEAK = 16, /* declared __weak, only used in byref copy
50	helpers */
51	BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
52	support routines */
53	BLOCK_BYREF_CURRENT_MAX = 256
54	};
55
56	enum {
57	BLOCK_NEEDS_FREE = (1 << 24),
58	BLOCK_HAS_COPY_DISPOSE = (1 << 25),
59	BLOCK_HAS_CXX_OBJ = (1 << 26),
60	BLOCK_IS_GC = (1 << 27),
61	BLOCK_IS_GLOBAL = (1 << 28),
62	BLOCK_HAS_DESCRIPTOR = (1 << 29)
63	};
64
65	Rewriter Rewrite;
66	DiagnosticsEngine &Diags;
67	const LangOptions &LangOpts;
68	ASTContext *Context;
69	SourceManager *SM;
70	TranslationUnitDecl *TUDecl;
71	FileID MainFileID;
72	const char *MainFileStart, *MainFileEnd;
73	Stmt *CurrentBody;
74	ParentMap *PropParentMap; // created lazily.
75	std::string InFileName;
76	std::unique_ptr<raw_ostream> OutFile;
77	std::string Preamble;
78
79	TypeDecl *ProtocolTypeDecl;
80	VarDecl *GlobalVarDecl;
81	Expr *GlobalConstructionExp;
82	unsigned RewriteFailedDiag;
83	unsigned GlobalBlockRewriteFailedDiag;
84	// ObjC string constant support.
85	unsigned NumObjCStringLiterals;
86	VarDecl *ConstantStringClassReference;
87	RecordDecl *NSStringRecord;
88
89	// ObjC foreach break/continue generation support.
90	int BcLabelCount;
91
92	unsigned TryFinallyContainsReturnDiag;
93	// Needed for super.
94	ObjCMethodDecl *CurMethodDef;
95	RecordDecl *SuperStructDecl;
96	RecordDecl *ConstantStringDecl;
97
98	FunctionDecl *MsgSendFunctionDecl;
99	FunctionDecl *MsgSendSuperFunctionDecl;
100	FunctionDecl *MsgSendStretFunctionDecl;
101	FunctionDecl *MsgSendSuperStretFunctionDecl;
102	FunctionDecl *MsgSendFpretFunctionDecl;
103	FunctionDecl *GetClassFunctionDecl;
104	FunctionDecl *GetMetaClassFunctionDecl;
105	FunctionDecl *GetSuperClassFunctionDecl;
106	FunctionDecl *SelGetUidFunctionDecl;
107	FunctionDecl *CFStringFunctionDecl;
108	FunctionDecl *SuperConstructorFunctionDecl;
109	FunctionDecl *CurFunctionDef;
110
111	/* Misc. containers needed for meta-data rewrite. */
112	SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
113	SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
114	llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
115	llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
116	llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCWrittenInterfaces;
117	llvm::SmallPtrSet<TagDecl*, 32> GlobalDefinedTags;
118	SmallVector<ObjCInterfaceDecl*, 32> ObjCInterfacesSeen;
119	/// DefinedNonLazyClasses - List of defined "non-lazy" classes.
120	SmallVector<ObjCInterfaceDecl*, 8> DefinedNonLazyClasses;
121
122	/// DefinedNonLazyCategories - List of defined "non-lazy" categories.
123	SmallVector<ObjCCategoryDecl *, 8> DefinedNonLazyCategories;
124
125	SmallVector<Stmt *, 32> Stmts;
126	SmallVector<int, 8> ObjCBcLabelNo;
127	// Remember all the @protocol(<expr>) expressions.
128	llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
129
130	llvm::DenseSet<uint64_t> CopyDestroyCache;
131
132	// Block expressions.
133	SmallVector<BlockExpr *, 32> Blocks;
134	SmallVector<int, 32> InnerDeclRefsCount;
135	SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
136
137	SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
138
139	// Block related declarations.
140	SmallVector<ValueDecl *, 8> BlockByCopyDecls;
141	llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
142	SmallVector<ValueDecl *, 8> BlockByRefDecls;
143	llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
144	llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
145	llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
146	llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
147
148	llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
149	llvm::DenseMap<ObjCInterfaceDecl *,
150	llvm::SmallSetVector<ObjCIvarDecl *, 8> > ReferencedIvars;
151
152	// ivar bitfield grouping containers
153	llvm::DenseSet<const ObjCInterfaceDecl *> ObjCInterefaceHasBitfieldGroups;
154	llvm::DenseMap<const ObjCIvarDecl* , unsigned> IvarGroupNumber;
155	// This container maps an <class, group number for ivar> tuple to the type
156	// of the struct where the bitfield belongs.
157	llvm::DenseMap<std::pair<const ObjCInterfaceDecl*, unsigned>, QualType> GroupRecordType;
158	SmallVector<FunctionDecl*, 32> FunctionDefinitionsSeen;
159
160	// This maps an original source AST to it's rewritten form. This allows
161	// us to avoid rewriting the same node twice (which is very uncommon).
162	// This is needed to support some of the exotic property rewriting.
163	llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
164
165	// Needed for header files being rewritten
166	bool IsHeader;
167	bool SilenceRewriteMacroWarning;
168	bool GenerateLineInfo;
169	bool objc_impl_method;
170
171	bool DisableReplaceStmt;
172	class DisableReplaceStmtScope {
173	RewriteModernObjC &R;
174	bool SavedValue;
175
176	public:
177	DisableReplaceStmtScope(RewriteModernObjC &R)
178	: R(R), SavedValue(R.DisableReplaceStmt) {
179	R.DisableReplaceStmt = true;
180	}
181	~DisableReplaceStmtScope() {
182	R.DisableReplaceStmt = SavedValue;
183	}
184	};
185	void InitializeCommon(ASTContext &context);
186
187	public:
188	llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
189
190	// Top Level Driver code.
191	bool HandleTopLevelDecl(DeclGroupRef D) override {
192	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
193	if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(Val: *I)) {
194	if (!Class->isThisDeclarationADefinition()) {
195	RewriteForwardClassDecl(D);
196	break;
197	} else {
198	// Keep track of all interface declarations seen.
199	ObjCInterfacesSeen.push_back(Elt: Class);
200	break;
201	}
202	}
203
204	if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(Val: *I)) {
205	if (!Proto->isThisDeclarationADefinition()) {
206	RewriteForwardProtocolDecl(D);
207	break;
208	}
209	}
210
211	if (FunctionDecl *FDecl = dyn_cast<FunctionDecl>(Val: *I)) {
212	// Under modern abi, we cannot translate body of the function
213	// yet until all class extensions and its implementation is seen.
214	// This is because they may introduce new bitfields which must go
215	// into their grouping struct.
216	if (FDecl->isThisDeclarationADefinition() &&
217	// Not c functions defined inside an objc container.
218	!FDecl->isTopLevelDeclInObjCContainer()) {
219	FunctionDefinitionsSeen.push_back(Elt: FDecl);
220	break;
221	}
222	}
223	HandleTopLevelSingleDecl(D: *I);
224	}
225	return true;
226	}
227
228	void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
229	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
230	if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Val: *I)) {
231	if (isTopLevelBlockPointerType(T: TD->getUnderlyingType()))
232	RewriteBlockPointerDecl(TD);
233	else if (TD->getUnderlyingType()->isFunctionPointerType())
234	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
235	else
236	RewriteObjCQualifiedInterfaceTypes(TD);
237	}
238	}
239	}
240
241	void HandleTopLevelSingleDecl(Decl *D);
242	void HandleDeclInMainFile(Decl *D);
243	RewriteModernObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
244	DiagnosticsEngine &D, const LangOptions &LOpts,
245	bool silenceMacroWarn, bool LineInfo);
246
247	~RewriteModernObjC() override {}
248
249	void HandleTranslationUnit(ASTContext &C) override;
250
251	void ReplaceStmt(Stmt *Old, Stmt *New) {
252	ReplaceStmtWithRange(Old, New, SrcRange: Old->getSourceRange());
253	}
254
255	void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
256	assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
257
258	Stmt *ReplacingStmt = ReplacedNodes[Old];
259	if (ReplacingStmt)
260	return; // We can't rewrite the same node twice.
261
262	if (DisableReplaceStmt)
263	return;
264
265	// Measure the old text.
266	int Size = Rewrite.getRangeSize(Range: SrcRange);
267	if (Size == -1) {
268	Diags.Report(Loc: Context->getFullLoc(Loc: Old->getBeginLoc()), DiagID: RewriteFailedDiag)
269	<< Old->getSourceRange();
270	return;
271	}
272	// Get the new text.
273	std::string SStr;
274	llvm::raw_string_ostream S(SStr);
275	New->printPretty(OS&: S, Helper: nullptr, Policy: PrintingPolicy(LangOpts));
276	const std::string &Str = S.str();
277
278	// If replacement succeeded or warning disabled return with no warning.
279	if (!Rewrite.ReplaceText(Start: SrcRange.getBegin(), OrigLength: Size, NewStr: Str)) {
280	ReplacedNodes[Old] = New;
281	return;
282	}
283	if (SilenceRewriteMacroWarning)
284	return;
285	Diags.Report(Loc: Context->getFullLoc(Loc: Old->getBeginLoc()), DiagID: RewriteFailedDiag)
286	<< Old->getSourceRange();
287	}
288
289	void InsertText(SourceLocation Loc, StringRef Str,
290	bool InsertAfter = true) {
291	// If insertion succeeded or warning disabled return with no warning.
292	if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
293	SilenceRewriteMacroWarning)
294	return;
295
296	Diags.Report(Loc: Context->getFullLoc(Loc), DiagID: RewriteFailedDiag);
297	}
298
299	void ReplaceText(SourceLocation Start, unsigned OrigLength,
300	StringRef Str) {
301	// If removal succeeded or warning disabled return with no warning.
302	if (!Rewrite.ReplaceText(Start, OrigLength, NewStr: Str) ||
303	SilenceRewriteMacroWarning)
304	return;
305
306	Diags.Report(Loc: Context->getFullLoc(Loc: Start), DiagID: RewriteFailedDiag);
307	}
308
309	// Syntactic Rewriting.
310	void RewriteRecordBody(RecordDecl *RD);
311	void RewriteInclude();
312	void RewriteLineDirective(const Decl *D);
313	void ConvertSourceLocationToLineDirective(SourceLocation Loc,
314	std::string &LineString);
315	void RewriteForwardClassDecl(DeclGroupRef D);
316	void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
317	void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
318	const std::string &typedefString);
319	void RewriteImplementations();
320	void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
321	ObjCImplementationDecl *IMD,
322	ObjCCategoryImplDecl *CID);
323	void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
324	void RewriteImplementationDecl(Decl *Dcl);
325	void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
326	ObjCMethodDecl *MDecl, std::string &ResultStr);
327	void RewriteTypeIntoString(QualType T, std::string &ResultStr,
328	const FunctionType *&FPRetType);
329	void RewriteByRefString(std::string &ResultStr, const std::string &Name,
330	ValueDecl *VD, bool def=false);
331	void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
332	void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
333	void RewriteForwardProtocolDecl(DeclGroupRef D);
334	void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
335	void RewriteMethodDeclaration(ObjCMethodDecl *Method);
336	void RewriteProperty(ObjCPropertyDecl *prop);
337	void RewriteFunctionDecl(FunctionDecl *FD);
338	void RewriteBlockPointerType(std::string& Str, QualType Type);
339	void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
340	void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
341	void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
342	void RewriteTypeOfDecl(VarDecl *VD);
343	void RewriteObjCQualifiedInterfaceTypes(Expr *E);
344
345	std::string getIvarAccessString(ObjCIvarDecl *D);
346
347	// Expression Rewriting.
348	Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
349	Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
350	Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
351	Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
352	Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
353	Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
354	Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
355	Stmt *RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp);
356	Stmt *RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp);
357	Stmt *RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp);
358	Stmt *RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp);
359	Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
360	Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
361	Stmt *RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S);
362	Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
363	Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
364	Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
365	SourceLocation OrigEnd);
366	Stmt *RewriteBreakStmt(BreakStmt *S);
367	Stmt *RewriteContinueStmt(ContinueStmt *S);
368	void RewriteCastExpr(CStyleCastExpr *CE);
369	void RewriteImplicitCastObjCExpr(CastExpr *IE);
370
371	// Computes ivar bitfield group no.
372	unsigned ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV);
373	// Names field decl. for ivar bitfield group.
374	void ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV, std::string &Result);
375	// Names struct type for ivar bitfield group.
376	void ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV, std::string &Result);
377	// Names symbol for ivar bitfield group field offset.
378	void ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV, std::string &Result);
379	// Given an ivar bitfield, it builds (or finds) its group record type.
380	QualType GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV);
381	QualType SynthesizeBitfieldGroupStructType(
382	ObjCIvarDecl *IV,
383	SmallVectorImpl<ObjCIvarDecl *> &IVars);
384
385	// Block rewriting.
386	void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
387
388	// Block specific rewrite rules.
389	void RewriteBlockPointerDecl(NamedDecl *VD);
390	void RewriteByRefVar(VarDecl *VD, bool firstDecl, bool lastDecl);
391	Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
392	Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
393	void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
394
395	void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
396	std::string &Result);
397
398	void RewriteObjCFieldDecl(FieldDecl *fieldDecl, std::string &Result);
399	bool IsTagDefinedInsideClass(ObjCContainerDecl *IDecl, TagDecl *Tag,
400	bool &IsNamedDefinition);
401	void RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
402	std::string &Result);
403
404	bool RewriteObjCFieldDeclType(QualType &Type, std::string &Result);
405
406	void RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
407	std::string &Result);
408
409	void Initialize(ASTContext &context) override;
410
411	// Misc. AST transformation routines. Sometimes they end up calling
412	// rewriting routines on the new ASTs.
413	CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
414	ArrayRef<Expr *> Args,
415	SourceLocation StartLoc=SourceLocation(),
416	SourceLocation EndLoc=SourceLocation());
417
418	Expr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
419	QualType returnType,
420	SmallVectorImpl<QualType> &ArgTypes,
421	SmallVectorImpl<Expr*> &MsgExprs,
422	ObjCMethodDecl *Method);
423
424	Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
425	SourceLocation StartLoc=SourceLocation(),
426	SourceLocation EndLoc=SourceLocation());
427
428	void SynthCountByEnumWithState(std::string &buf);
429	void SynthMsgSendFunctionDecl();
430	void SynthMsgSendSuperFunctionDecl();
431	void SynthMsgSendStretFunctionDecl();
432	void SynthMsgSendFpretFunctionDecl();
433	void SynthMsgSendSuperStretFunctionDecl();
434	void SynthGetClassFunctionDecl();
435	void SynthGetMetaClassFunctionDecl();
436	void SynthGetSuperClassFunctionDecl();
437	void SynthSelGetUidFunctionDecl();
438	void SynthSuperConstructorFunctionDecl();
439
440	// Rewriting metadata
441	template<typename MethodIterator>
442	void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
443	MethodIterator MethodEnd,
444	bool IsInstanceMethod,
445	StringRef prefix,
446	StringRef ClassName,
447	std::string &Result);
448	void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
449	std::string &Result);
450	void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
451	std::string &Result);
452	void RewriteClassSetupInitHook(std::string &Result);
453
454	void RewriteMetaDataIntoBuffer(std::string &Result);
455	void WriteImageInfo(std::string &Result);
456	void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
457	std::string &Result);
458	void RewriteCategorySetupInitHook(std::string &Result);
459
460	// Rewriting ivar
461	void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
462	std::string &Result);
463	Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV);
464
465
466	std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
467	std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
468	StringRef funcName, std::string Tag);
469	std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
470	StringRef funcName, std::string Tag);
471	std::string SynthesizeBlockImpl(BlockExpr *CE,
472	std::string Tag, std::string Desc);
473	std::string SynthesizeBlockDescriptor(std::string DescTag,
474	std::string ImplTag,
475	int i, StringRef funcName,
476	unsigned hasCopy);
477	Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
478	void SynthesizeBlockLiterals(SourceLocation FunLocStart,
479	StringRef FunName);
480	FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
481	Stmt *SynthBlockInitExpr(BlockExpr *Exp,
482	const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
483
484	// Misc. helper routines.
485	QualType getProtocolType();
486	void WarnAboutReturnGotoStmts(Stmt *S);
487	void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
488	void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
489	void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
490
491	bool IsDeclStmtInForeachHeader(DeclStmt *DS);
492	void CollectBlockDeclRefInfo(BlockExpr *Exp);
493	void GetBlockDeclRefExprs(Stmt *S);
494	void GetInnerBlockDeclRefExprs(Stmt *S,
495	SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
496	llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
497
498	// We avoid calling Type::isBlockPointerType(), since it operates on the
499	// canonical type. We only care if the top-level type is a closure pointer.
500	bool isTopLevelBlockPointerType(QualType T) {
501	return isa<BlockPointerType>(Val: T);
502	}
503
504	/// convertBlockPointerToFunctionPointer - Converts a block-pointer type
505	/// to a function pointer type and upon success, returns true; false
506	/// otherwise.
507	bool convertBlockPointerToFunctionPointer(QualType &T) {
508	if (isTopLevelBlockPointerType(T)) {
509	const auto *BPT = T->castAs<BlockPointerType>();
510	T = Context->getPointerType(T: BPT->getPointeeType());
511	return true;
512	}
513	return false;
514	}
515
516	bool convertObjCTypeToCStyleType(QualType &T);
517
518	bool needToScanForQualifiers(QualType T);
519	QualType getSuperStructType();
520	QualType getConstantStringStructType();
521	QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
522
523	void convertToUnqualifiedObjCType(QualType &T) {
524	if (T->isObjCQualifiedIdType()) {
525	bool isConst = T.isConstQualified();
526	T = isConst ? Context->getObjCIdType().withConst()
527	: Context->getObjCIdType();
528	}
529	else if (T->isObjCQualifiedClassType())
530	T = Context->getObjCClassType();
531	else if (T->isObjCObjectPointerType() &&
532	T->getPointeeType()->isObjCQualifiedInterfaceType()) {
533	if (const ObjCObjectPointerType * OBJPT =
534	T->getAsObjCInterfacePointerType()) {
535	const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
536	T = QualType(IFaceT, 0);
537	T = Context->getPointerType(T);
538	}
539	}
540	}
541
542	// FIXME: This predicate seems like it would be useful to add to ASTContext.
543	bool isObjCType(QualType T) {
544	if (!LangOpts.ObjC)
545	return false;
546
547	QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
548
549	if (OCT == Context->getCanonicalType(T: Context->getObjCIdType()) ||
550	OCT == Context->getCanonicalType(T: Context->getObjCClassType()))
551	return true;
552
553	if (const PointerType *PT = OCT->getAs<PointerType>()) {
554	if (isa<ObjCInterfaceType>(Val: PT->getPointeeType()) ||
555	PT->getPointeeType()->isObjCQualifiedIdType())
556	return true;
557	}
558	return false;
559	}
560
561	bool PointerTypeTakesAnyBlockArguments(QualType QT);
562	bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
563	void GetExtentOfArgList(const char *Name, const char *&LParen,
564	const char *&RParen);
565
566	void QuoteDoublequotes(std::string &From, std::string &To) {
567	for (unsigned i = 0; i < From.length(); i++) {
568	if (From[i] == '"')
569	To += "\\\"";
570	else
571	To += From[i];
572	}
573	}
574
575	QualType getSimpleFunctionType(QualType result,
576	ArrayRef<QualType> args,
577	bool variadic = false) {
578	if (result == Context->getObjCInstanceType())
579	result = Context->getObjCIdType();
580	FunctionProtoType::ExtProtoInfo fpi;
581	fpi.Variadic = variadic;
582	return Context->getFunctionType(ResultTy: result, Args: args, EPI: fpi);
583	}
584
585	// Helper function: create a CStyleCastExpr with trivial type source info.
586	CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
587	CastKind Kind, Expr *E) {
588	TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(T: Ty, Loc: SourceLocation());
589	return CStyleCastExpr::Create(Context: *Ctx, T: Ty, VK: VK_PRValue, K: Kind, Op: E, BasePath: nullptr,
590	FPO: FPOptionsOverride(), WrittenTy: TInfo,
591	L: SourceLocation(), R: SourceLocation());
592	}
593
594	bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
595	const IdentifierInfo *II = &Context->Idents.get(Name: "load");
596	Selector LoadSel = Context->Selectors.getSelector(NumArgs: 0, IIV: &II);
597	return OD->getClassMethod(LoadSel) != nullptr;
598	}
599
600	StringLiteral *getStringLiteral(StringRef Str) {
601	QualType StrType = Context->getConstantArrayType(
602	EltTy: Context->CharTy, ArySize: llvm::APInt(32, Str.size() + 1), SizeExpr: nullptr,
603	ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0);
604	return StringLiteral::Create(Ctx: *Context, Str, Kind: StringLiteralKind::Ordinary,
605	/*Pascal=*/false, Ty: StrType, Loc: SourceLocation());
606	}
607	};
608	} // end anonymous namespace
609
610	void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
611	NamedDecl *D) {
612	if (const FunctionProtoType *fproto
613	= dyn_cast<FunctionProtoType>(Val: funcType.IgnoreParens())) {
614	for (const auto &I : fproto->param_types())
615	if (isTopLevelBlockPointerType(T: I)) {
616	// All the args are checked/rewritten. Don't call twice!
617	RewriteBlockPointerDecl(VD: D);
618	break;
619	}
620	}
621	}
622
623	void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
624	const PointerType *PT = funcType->getAs<PointerType>();
625	if (PT && PointerTypeTakesAnyBlockArguments(QT: funcType))
626	RewriteBlocksInFunctionProtoType(funcType: PT->getPointeeType(), D: ND);
627	}
628
629	static bool IsHeaderFile(const std::string &Filename) {
630	std::string::size_type DotPos = Filename.rfind(c: '.');
631
632	if (DotPos == std::string::npos) {
633	// no file extension
634	return false;
635	}
636
637	std::string Ext = Filename.substr(pos: DotPos + 1);
638	// C header: .h
639	// C++ header: .hh or .H;
640	return Ext == "h" || Ext == "hh" || Ext == "H";
641	}
642
643	RewriteModernObjC::RewriteModernObjC(std::string inFile,
644	std::unique_ptr<raw_ostream> OS,
645	DiagnosticsEngine &D,
646	const LangOptions &LOpts,
647	bool silenceMacroWarn, bool LineInfo)
648	: Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
649	SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
650	IsHeader = IsHeaderFile(Filename: inFile);
651	RewriteFailedDiag = Diags.getCustomDiagID(L: DiagnosticsEngine::Warning,
652	FormatString: "rewriting sub-expression within a macro (may not be correct)");
653	// FIXME. This should be an error. But if block is not called, it is OK. And it
654	// may break including some headers.
655	GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(L: DiagnosticsEngine::Warning,
656	FormatString: "rewriting block literal declared in global scope is not implemented");
657
658	TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
659	L: DiagnosticsEngine::Warning,
660	FormatString: "rewriter doesn't support user-specified control flow semantics "
661	"for @try/@finally (code may not execute properly)");
662	}
663
664	std::unique_ptr<ASTConsumer> clang::CreateModernObjCRewriter(
665	const std::string &InFile, std::unique_ptr<raw_ostream> OS,
666	DiagnosticsEngine &Diags, const LangOptions &LOpts,
667	bool SilenceRewriteMacroWarning, bool LineInfo) {
668	return std::make_unique<RewriteModernObjC>(args: InFile, args: std::move(OS), args&: Diags,
669	args: LOpts, args&: SilenceRewriteMacroWarning,
670	args&: LineInfo);
671	}
672
673	void RewriteModernObjC::InitializeCommon(ASTContext &context) {
674	Context = &context;
675	SM = &Context->getSourceManager();
676	TUDecl = Context->getTranslationUnitDecl();
677	MsgSendFunctionDecl = nullptr;
678	MsgSendSuperFunctionDecl = nullptr;
679	MsgSendStretFunctionDecl = nullptr;
680	MsgSendSuperStretFunctionDecl = nullptr;
681	MsgSendFpretFunctionDecl = nullptr;
682	GetClassFunctionDecl = nullptr;
683	GetMetaClassFunctionDecl = nullptr;
684	GetSuperClassFunctionDecl = nullptr;
685	SelGetUidFunctionDecl = nullptr;
686	CFStringFunctionDecl = nullptr;
687	ConstantStringClassReference = nullptr;
688	NSStringRecord = nullptr;
689	CurMethodDef = nullptr;
690	CurFunctionDef = nullptr;
691	GlobalVarDecl = nullptr;
692	GlobalConstructionExp = nullptr;
693	SuperStructDecl = nullptr;
694	ProtocolTypeDecl = nullptr;
695	ConstantStringDecl = nullptr;
696	BcLabelCount = 0;
697	SuperConstructorFunctionDecl = nullptr;
698	NumObjCStringLiterals = 0;
699	PropParentMap = nullptr;
700	CurrentBody = nullptr;
701	DisableReplaceStmt = false;
702	objc_impl_method = false;
703
704	// Get the ID and start/end of the main file.
705	MainFileID = SM->getMainFileID();
706	llvm::MemoryBufferRef MainBuf = SM->getBufferOrFake(FID: MainFileID);
707	MainFileStart = MainBuf.getBufferStart();
708	MainFileEnd = MainBuf.getBufferEnd();
709
710	Rewrite.setSourceMgr(SM&: Context->getSourceManager(), LO: Context->getLangOpts());
711	}
712
713	//===----------------------------------------------------------------------===//
714	// Top Level Driver Code
715	//===----------------------------------------------------------------------===//
716
717	void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
718	if (Diags.hasErrorOccurred())
719	return;
720
721	// Two cases: either the decl could be in the main file, or it could be in a
722	// #included file. If the former, rewrite it now. If the later, check to see
723	// if we rewrote the #include/#import.
724	SourceLocation Loc = D->getLocation();
725	Loc = SM->getExpansionLoc(Loc);
726
727	// If this is for a builtin, ignore it.
728	if (Loc.isInvalid()) return;
729
730	// Look for built-in declarations that we need to refer during the rewrite.
731	if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: D)) {
732	RewriteFunctionDecl(FD);
733	} else if (VarDecl *FVD = dyn_cast<VarDecl>(Val: D)) {
734	// declared in <Foundation/NSString.h>
735	if (FVD->getName() == "_NSConstantStringClassReference") {
736	ConstantStringClassReference = FVD;
737	return;
738	}
739	} else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(Val: D)) {
740	RewriteCategoryDecl(Dcl: CD);
741	} else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(Val: D)) {
742	if (PD->isThisDeclarationADefinition())
743	RewriteProtocolDecl(Dcl: PD);
744	} else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(Val: D)) {
745	// Recurse into linkage specifications
746	for (DeclContext::decl_iterator DI = LSD->decls_begin(),
747	DIEnd = LSD->decls_end();
748	DI != DIEnd; ) {
749	if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>(Val: (*DI))) {
750	if (!IFace->isThisDeclarationADefinition()) {
751	SmallVector<Decl *, 8> DG;
752	SourceLocation StartLoc = IFace->getBeginLoc();
753	do {
754	if (isa<ObjCInterfaceDecl>(Val: *DI) &&
755	!cast<ObjCInterfaceDecl>(Val: *DI)->isThisDeclarationADefinition() &&
756	StartLoc == (*DI)->getBeginLoc())
757	DG.push_back(Elt: *DI);
758	else
759	break;
760
761	++DI;
762	} while (DI != DIEnd);
763	RewriteForwardClassDecl(DG);
764	continue;
765	}
766	else {
767	// Keep track of all interface declarations seen.
768	ObjCInterfacesSeen.push_back(Elt: IFace);
769	++DI;
770	continue;
771	}
772	}
773
774	if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(Val: (*DI))) {
775	if (!Proto->isThisDeclarationADefinition()) {
776	SmallVector<Decl *, 8> DG;
777	SourceLocation StartLoc = Proto->getBeginLoc();
778	do {
779	if (isa<ObjCProtocolDecl>(Val: *DI) &&
780	!cast<ObjCProtocolDecl>(Val: *DI)->isThisDeclarationADefinition() &&
781	StartLoc == (*DI)->getBeginLoc())
782	DG.push_back(Elt: *DI);
783	else
784	break;
785
786	++DI;
787	} while (DI != DIEnd);
788	RewriteForwardProtocolDecl(DG);
789	continue;
790	}
791	}
792
793	HandleTopLevelSingleDecl(D: *DI);
794	++DI;
795	}
796	}
797	// If we have a decl in the main file, see if we should rewrite it.
798	if (SM->isWrittenInMainFile(Loc))
799	return HandleDeclInMainFile(D);
800	}
801
802	//===----------------------------------------------------------------------===//
803	// Syntactic (non-AST) Rewriting Code
804	//===----------------------------------------------------------------------===//
805
806	void RewriteModernObjC::RewriteInclude() {
807	SourceLocation LocStart = SM->getLocForStartOfFile(FID: MainFileID);
808	StringRef MainBuf = SM->getBufferData(FID: MainFileID);
809	const char *MainBufStart = MainBuf.begin();
810	const char *MainBufEnd = MainBuf.end();
811	size_t ImportLen = strlen(s: "import");
812
813	// Loop over the whole file, looking for includes.
814	for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
815	if (*BufPtr == '#') {
816	if (++BufPtr == MainBufEnd)
817	return;
818	while (*BufPtr == ' ' || *BufPtr == '\t')
819	if (++BufPtr == MainBufEnd)
820	return;
821	if (!strncmp(s1: BufPtr, s2: "import", n: ImportLen)) {
822	// replace import with include
823	SourceLocation ImportLoc =
824	LocStart.getLocWithOffset(Offset: BufPtr-MainBufStart);
825	ReplaceText(Start: ImportLoc, OrigLength: ImportLen, Str: "include");
826	BufPtr += ImportLen;
827	}
828	}
829	}
830	}
831
832	static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
833	ObjCIvarDecl *IvarDecl, std::string &Result) {
834	Result += "OBJC_IVAR_$_";
835	Result += IDecl->getName();
836	Result += "$";
837	Result += IvarDecl->getName();
838	}
839
840	std::string
841	RewriteModernObjC::getIvarAccessString(ObjCIvarDecl *D) {
842	const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
843
844	// Build name of symbol holding ivar offset.
845	std::string IvarOffsetName;
846	if (D->isBitField())
847	ObjCIvarBitfieldGroupOffset(IV: D, Result&: IvarOffsetName);
848	else
849	WriteInternalIvarName(IDecl: ClassDecl, IvarDecl: D, Result&: IvarOffsetName);
850
851	std::string S = "(*(";
852	QualType IvarT = D->getType();
853	if (D->isBitField())
854	IvarT = GetGroupRecordTypeForObjCIvarBitfield(IV: D);
855
856	if (!IvarT->getAs<TypedefType>() && IvarT->isRecordType()) {
857	RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
858	RD = RD->getDefinition();
859	if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
860	// decltype(((Foo_IMPL*)0)->bar) *
861	auto *CDecl = cast<ObjCContainerDecl>(D->getDeclContext());
862	// ivar in class extensions requires special treatment.
863	if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
864	CDecl = CatDecl->getClassInterface();
865	std::string RecName = std::string(CDecl->getName());
866	RecName += "_IMPL";
867	RecordDecl *RD = RecordDecl::Create(*Context, TagTypeKind::Struct, TUDecl,
868	SourceLocation(), SourceLocation(),
869	&Context->Idents.get(Name: RecName));
870	QualType PtrStructIMPL = Context->getPointerType(T: Context->getTagDeclType(RD));
871	unsigned UnsignedIntSize =
872	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
873	Expr *Zero = IntegerLiteral::Create(*Context,
874	llvm::APInt(UnsignedIntSize, 0),
875	Context->UnsignedIntTy, SourceLocation());
876	Zero = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: PtrStructIMPL, Kind: CK_BitCast, E: Zero);
877	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
878	Zero);
879	FieldDecl *FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
880	IdLoc: SourceLocation(),
881	Id: &Context->Idents.get(D->getNameAsString()),
882	T: IvarT, TInfo: nullptr,
883	/*BitWidth=*/BW: nullptr, /*Mutable=*/true,
884	InitStyle: ICIS_NoInit);
885	MemberExpr *ME = MemberExpr::CreateImplicit(
886	C: *Context, Base: PE, IsArrow: true, MemberDecl: FD, T: FD->getType(), VK: VK_LValue, OK: OK_Ordinary);
887	IvarT = Context->getDecltypeType(e: ME, UnderlyingType: ME->getType());
888	}
889	}
890	convertObjCTypeToCStyleType(T&: IvarT);
891	QualType castT = Context->getPointerType(T: IvarT);
892	std::string TypeString(castT.getAsString(Policy: Context->getPrintingPolicy()));
893	S += TypeString;
894	S += ")";
895
896	// ((char *)self + IVAR_OFFSET_SYMBOL_NAME)
897	S += "((char *)self + ";
898	S += IvarOffsetName;
899	S += "))";
900	if (D->isBitField()) {
901	S += ".";
902	S += D->getNameAsString();
903	}
904	ReferencedIvars[const_cast<ObjCInterfaceDecl *>(ClassDecl)].insert(X: D);
905	return S;
906	}
907
908	/// mustSynthesizeSetterGetterMethod - returns true if setter or getter has not
909	/// been found in the class implementation. In this case, it must be synthesized.
910	static bool mustSynthesizeSetterGetterMethod(ObjCImplementationDecl *IMP,
911	ObjCPropertyDecl *PD,
912	bool getter) {
913	auto *OMD = IMP->getInstanceMethod(getter ? PD->getGetterName()
914	: PD->getSetterName());
915	return !OMD || OMD->isSynthesizedAccessorStub();
916	}
917
918	void RewriteModernObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
919	ObjCImplementationDecl *IMD,
920	ObjCCategoryImplDecl *CID) {
921	static bool objcGetPropertyDefined = false;
922	static bool objcSetPropertyDefined = false;
923	SourceLocation startGetterSetterLoc;
924
925	if (PID->getBeginLoc().isValid()) {
926	SourceLocation startLoc = PID->getBeginLoc();
927	InsertText(Loc: startLoc, Str: "// ");
928	const char *startBuf = SM->getCharacterData(SL: startLoc);
929	assert((*startBuf == '@') && "bogus @synthesize location");
930	const char *semiBuf = strchr(s: startBuf, c: ';');
931	assert((*semiBuf == ';') && "@synthesize: can't find ';'");
932	startGetterSetterLoc = startLoc.getLocWithOffset(Offset: semiBuf-startBuf+1);
933	} else
934	startGetterSetterLoc = IMD ? IMD->getEndLoc() : CID->getEndLoc();
935
936	if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
937	return; // FIXME: is this correct?
938
939	// Generate the 'getter' function.
940	ObjCPropertyDecl *PD = PID->getPropertyDecl();
941	ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
942	assert(IMD && OID && "Synthesized ivars must be attached to @implementation");
943
944	unsigned Attributes = PD->getPropertyAttributes();
945	if (mustSynthesizeSetterGetterMethod(IMP: IMD, PD, getter: true /*getter*/)) {
946	bool GenGetProperty =
947	!(Attributes & ObjCPropertyAttribute::kind_nonatomic) &&
948	(Attributes & (ObjCPropertyAttribute::kind_retain |
949	ObjCPropertyAttribute::kind_copy));
950	std::string Getr;
951	if (GenGetProperty && !objcGetPropertyDefined) {
952	objcGetPropertyDefined = true;
953	// FIXME. Is this attribute correct in all cases?
954	Getr = "\nextern \"C\" __declspec(dllimport) "
955	"id objc_getProperty(id, SEL, long, bool);\n";
956	}
957	RewriteObjCMethodDecl(IDecl: OID->getContainingInterface(),
958	MDecl: PID->getGetterMethodDecl(), ResultStr&: Getr);
959	Getr += "{ ";
960	// Synthesize an explicit cast to gain access to the ivar.
961	// See objc-act.c:objc_synthesize_new_getter() for details.
962	if (GenGetProperty) {
963	// return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
964	Getr += "typedef ";
965	const FunctionType *FPRetType = nullptr;
966	RewriteTypeIntoString(T: PID->getGetterMethodDecl()->getReturnType(), ResultStr&: Getr,
967	FPRetType);
968	Getr += " _TYPE";
969	if (FPRetType) {
970	Getr += ")"; // close the precedence "scope" for "*".
971
972	// Now, emit the argument types (if any).
973	if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(Val: FPRetType)){
974	Getr += "(";
975	for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
976	if (i) Getr += ", ";
977	std::string ParamStr =
978	FT->getParamType(i).getAsString(Policy: Context->getPrintingPolicy());
979	Getr += ParamStr;
980	}
981	if (FT->isVariadic()) {
982	if (FT->getNumParams())
983	Getr += ", ";
984	Getr += "...";
985	}
986	Getr += ")";
987	} else
988	Getr += "()";
989	}
990	Getr += ";\n";
991	Getr += "return (_TYPE)";
992	Getr += "objc_getProperty(self, _cmd, ";
993	RewriteIvarOffsetComputation(ivar: OID, Result&: Getr);
994	Getr += ", 1)";
995	}
996	else
997	Getr += "return " + getIvarAccessString(D: OID);
998	Getr += "; }";
999	InsertText(Loc: startGetterSetterLoc, Str: Getr);
1000	}
1001
1002	if (PD->isReadOnly() ||
1003	!mustSynthesizeSetterGetterMethod(IMP: IMD, PD, getter: false /*setter*/))
1004	return;
1005
1006	// Generate the 'setter' function.
1007	std::string Setr;
1008	bool GenSetProperty = Attributes & (ObjCPropertyAttribute::kind_retain |
1009	ObjCPropertyAttribute::kind_copy);
1010	if (GenSetProperty && !objcSetPropertyDefined) {
1011	objcSetPropertyDefined = true;
1012	// FIXME. Is this attribute correct in all cases?
1013	Setr = "\nextern \"C\" __declspec(dllimport) "
1014	"void objc_setProperty (id, SEL, long, id, bool, bool);\n";
1015	}
1016
1017	RewriteObjCMethodDecl(IDecl: OID->getContainingInterface(),
1018	MDecl: PID->getSetterMethodDecl(), ResultStr&: Setr);
1019	Setr += "{ ";
1020	// Synthesize an explicit cast to initialize the ivar.
1021	// See objc-act.c:objc_synthesize_new_setter() for details.
1022	if (GenSetProperty) {
1023	Setr += "objc_setProperty (self, _cmd, ";
1024	RewriteIvarOffsetComputation(ivar: OID, Result&: Setr);
1025	Setr += ", (id)";
1026	Setr += PD->getName();
1027	Setr += ", ";
1028	if (Attributes & ObjCPropertyAttribute::kind_nonatomic)
1029	Setr += "0, ";
1030	else
1031	Setr += "1, ";
1032	if (Attributes & ObjCPropertyAttribute::kind_copy)
1033	Setr += "1)";
1034	else
1035	Setr += "0)";
1036	}
1037	else {
1038	Setr += getIvarAccessString(D: OID) + " = ";
1039	Setr += PD->getName();
1040	}
1041	Setr += "; }\n";
1042	InsertText(Loc: startGetterSetterLoc, Str: Setr);
1043	}
1044
1045	static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
1046	std::string &typedefString) {
1047	typedefString += "\n#ifndef _REWRITER_typedef_";
1048	typedefString += ForwardDecl->getNameAsString();
1049	typedefString += "\n";
1050	typedefString += "#define _REWRITER_typedef_";
1051	typedefString += ForwardDecl->getNameAsString();
1052	typedefString += "\n";
1053	typedefString += "typedef struct objc_object ";
1054	typedefString += ForwardDecl->getNameAsString();
1055	// typedef struct { } _objc_exc_Classname;
1056	typedefString += ";\ntypedef struct {} _objc_exc_";
1057	typedefString += ForwardDecl->getNameAsString();
1058	typedefString += ";\n#endif\n";
1059	}
1060
1061	void RewriteModernObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
1062	const std::string &typedefString) {
1063	SourceLocation startLoc = ClassDecl->getBeginLoc();
1064	const char *startBuf = SM->getCharacterData(SL: startLoc);
1065	const char *semiPtr = strchr(s: startBuf, c: ';');
1066	// Replace the @class with typedefs corresponding to the classes.
1067	ReplaceText(Start: startLoc, OrigLength: semiPtr-startBuf+1, Str: typedefString);
1068	}
1069
1070	void RewriteModernObjC::RewriteForwardClassDecl(DeclGroupRef D) {
1071	std::string typedefString;
1072	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
1073	if (ObjCInterfaceDecl *ForwardDecl = dyn_cast<ObjCInterfaceDecl>(Val: *I)) {
1074	if (I == D.begin()) {
1075	// Translate to typedef's that forward reference structs with the same name
1076	// as the class. As a convenience, we include the original declaration
1077	// as a comment.
1078	typedefString += "// @class ";
1079	typedefString += ForwardDecl->getNameAsString();
1080	typedefString += ";";
1081	}
1082	RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1083	}
1084	else
1085	HandleTopLevelSingleDecl(D: *I);
1086	}
1087	DeclGroupRef::iterator I = D.begin();
1088	RewriteForwardClassEpilogue(ClassDecl: cast<ObjCInterfaceDecl>(Val: *I), typedefString);
1089	}
1090
1091	void RewriteModernObjC::RewriteForwardClassDecl(
1092	const SmallVectorImpl<Decl *> &D) {
1093	std::string typedefString;
1094	for (unsigned i = 0; i < D.size(); i++) {
1095	ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(Val: D[i]);
1096	if (i == 0) {
1097	typedefString += "// @class ";
1098	typedefString += ForwardDecl->getNameAsString();
1099	typedefString += ";";
1100	}
1101	RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1102	}
1103	RewriteForwardClassEpilogue(ClassDecl: cast<ObjCInterfaceDecl>(Val: D[0]), typedefString);
1104	}
1105
1106	void RewriteModernObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
1107	// When method is a synthesized one, such as a getter/setter there is
1108	// nothing to rewrite.
1109	if (Method->isImplicit())
1110	return;
1111	SourceLocation LocStart = Method->getBeginLoc();
1112	SourceLocation LocEnd = Method->getEndLoc();
1113
1114	if (SM->getExpansionLineNumber(Loc: LocEnd) >
1115	SM->getExpansionLineNumber(Loc: LocStart)) {
1116	InsertText(Loc: LocStart, Str: "#if 0\n");
1117	ReplaceText(Start: LocEnd, OrigLength: 1, Str: ";\n#endif\n");
1118	} else {
1119	InsertText(Loc: LocStart, Str: "// ");
1120	}
1121	}
1122
1123	void RewriteModernObjC::RewriteProperty(ObjCPropertyDecl *prop) {
1124	SourceLocation Loc = prop->getAtLoc();
1125
1126	ReplaceText(Start: Loc, OrigLength: 0, Str: "// ");
1127	// FIXME: handle properties that are declared across multiple lines.
1128	}
1129
1130	void RewriteModernObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
1131	SourceLocation LocStart = CatDecl->getBeginLoc();
1132
1133	// FIXME: handle category headers that are declared across multiple lines.
1134	if (CatDecl->getIvarRBraceLoc().isValid()) {
1135	ReplaceText(Start: LocStart, OrigLength: 1, Str: "/** ");
1136	ReplaceText(Start: CatDecl->getIvarRBraceLoc(), OrigLength: 1, Str: "**/ ");
1137	}
1138	else {
1139	ReplaceText(Start: LocStart, OrigLength: 0, Str: "// ");
1140	}
1141
1142	for (auto *I : CatDecl->instance_properties())
1143	RewriteProperty(I);
1144
1145	for (auto *I : CatDecl->instance_methods())
1146	RewriteMethodDeclaration(I);
1147	for (auto *I : CatDecl->class_methods())
1148	RewriteMethodDeclaration(I);
1149
1150	// Lastly, comment out the @end.
1151	ReplaceText(Start: CatDecl->getAtEndRange().getBegin(),
1152	OrigLength: strlen(s: "@end"), Str: "/* @end */\n");
1153	}
1154
1155	void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
1156	SourceLocation LocStart = PDecl->getBeginLoc();
1157	assert(PDecl->isThisDeclarationADefinition());
1158
1159	// FIXME: handle protocol headers that are declared across multiple lines.
1160	ReplaceText(Start: LocStart, OrigLength: 0, Str: "// ");
1161
1162	for (auto *I : PDecl->instance_methods())
1163	RewriteMethodDeclaration(I);
1164	for (auto *I : PDecl->class_methods())
1165	RewriteMethodDeclaration(I);
1166	for (auto *I : PDecl->instance_properties())
1167	RewriteProperty(I);
1168
1169	// Lastly, comment out the @end.
1170	SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
1171	ReplaceText(Start: LocEnd, OrigLength: strlen(s: "@end"), Str: "/* @end */\n");
1172
1173	// Must comment out @optional/@required
1174	const char *startBuf = SM->getCharacterData(SL: LocStart);
1175	const char *endBuf = SM->getCharacterData(SL: LocEnd);
1176	for (const char *p = startBuf; p < endBuf; p++) {
1177	if (*p == '@' && !strncmp(s1: p+1, s2: "optional", n: strlen(s: "optional"))) {
1178	SourceLocation OptionalLoc = LocStart.getLocWithOffset(Offset: p-startBuf);
1179	ReplaceText(Start: OptionalLoc, OrigLength: strlen(s: "@optional"), Str: "/* @optional */");
1180
1181	}
1182	else if (*p == '@' && !strncmp(s1: p+1, s2: "required", n: strlen(s: "required"))) {
1183	SourceLocation OptionalLoc = LocStart.getLocWithOffset(Offset: p-startBuf);
1184	ReplaceText(Start: OptionalLoc, OrigLength: strlen(s: "@required"), Str: "/* @required */");
1185
1186	}
1187	}
1188	}
1189
1190	void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
1191	SourceLocation LocStart = (*D.begin())->getBeginLoc();
1192	if (LocStart.isInvalid())
1193	llvm_unreachable("Invalid SourceLocation");
1194	// FIXME: handle forward protocol that are declared across multiple lines.
1195	ReplaceText(Start: LocStart, OrigLength: 0, Str: "// ");
1196	}
1197
1198	void
1199	RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
1200	SourceLocation LocStart = DG[0]->getBeginLoc();
1201	if (LocStart.isInvalid())
1202	llvm_unreachable("Invalid SourceLocation");
1203	// FIXME: handle forward protocol that are declared across multiple lines.
1204	ReplaceText(Start: LocStart, OrigLength: 0, Str: "// ");
1205	}
1206
1207	void RewriteModernObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
1208	const FunctionType *&FPRetType) {
1209	if (T->isObjCQualifiedIdType())
1210	ResultStr += "id";
1211	else if (T->isFunctionPointerType() ||
1212	T->isBlockPointerType()) {
1213	// needs special handling, since pointer-to-functions have special
1214	// syntax (where a decaration models use).
1215	QualType retType = T;
1216	QualType PointeeTy;
1217	if (const PointerType* PT = retType->getAs<PointerType>())
1218	PointeeTy = PT->getPointeeType();
1219	else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
1220	PointeeTy = BPT->getPointeeType();
1221	if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
1222	ResultStr +=
1223	FPRetType->getReturnType().getAsString(Policy: Context->getPrintingPolicy());
1224	ResultStr += "(*";
1225	}
1226	} else
1227	ResultStr += T.getAsString(Policy: Context->getPrintingPolicy());
1228	}
1229
1230	void RewriteModernObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
1231	ObjCMethodDecl *OMD,
1232	std::string &ResultStr) {
1233	//fprintf(stderr,"In RewriteObjCMethodDecl\n");
1234	const FunctionType *FPRetType = nullptr;
1235	ResultStr += "\nstatic ";
1236	RewriteTypeIntoString(T: OMD->getReturnType(), ResultStr, FPRetType);
1237	ResultStr += " ";
1238
1239	// Unique method name
1240	std::string NameStr;
1241
1242	if (OMD->isInstanceMethod())
1243	NameStr += "_I_";
1244	else
1245	NameStr += "_C_";
1246
1247	NameStr += IDecl->getNameAsString();
1248	NameStr += "_";
1249
1250	if (ObjCCategoryImplDecl *CID =
1251	dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
1252	NameStr += CID->getNameAsString();
1253	NameStr += "_";
1254	}
1255	// Append selector names, replacing ':' with '_'
1256	{
1257	std::string selString = OMD->getSelector().getAsString();
1258	int len = selString.size();
1259	for (int i = 0; i < len; i++)
1260	if (selString[i] == ':')
1261	selString[i] = '_';
1262	NameStr += selString;
1263	}
1264	// Remember this name for metadata emission
1265	MethodInternalNames[OMD] = NameStr;
1266	ResultStr += NameStr;
1267
1268	// Rewrite arguments
1269	ResultStr += "(";
1270
1271	// invisible arguments
1272	if (OMD->isInstanceMethod()) {
1273	QualType selfTy = Context->getObjCInterfaceType(Decl: IDecl);
1274	selfTy = Context->getPointerType(T: selfTy);
1275	if (!LangOpts.MicrosoftExt) {
1276	if (ObjCSynthesizedStructs.count(Ptr: const_cast<ObjCInterfaceDecl*>(IDecl)))
1277	ResultStr += "struct ";
1278	}
1279	// When rewriting for Microsoft, explicitly omit the structure name.
1280	ResultStr += IDecl->getNameAsString();
1281	ResultStr += " *";
1282	}
1283	else
1284	ResultStr += Context->getObjCClassType().getAsString(
1285	Policy: Context->getPrintingPolicy());
1286
1287	ResultStr += " self, ";
1288	ResultStr += Context->getObjCSelType().getAsString(Policy: Context->getPrintingPolicy());
1289	ResultStr += " _cmd";
1290
1291	// Method arguments.
1292	for (const auto *PDecl : OMD->parameters()) {
1293	ResultStr += ", ";
1294	if (PDecl->getType()->isObjCQualifiedIdType()) {
1295	ResultStr += "id ";
1296	ResultStr += PDecl->getNameAsString();
1297	} else {
1298	std::string Name = PDecl->getNameAsString();
1299	QualType QT = PDecl->getType();
1300	// Make sure we convert "t (^)(...)" to "t (*)(...)".
1301	(void)convertBlockPointerToFunctionPointer(T&: QT);
1302	QT.getAsStringInternal(Str&: Name, Policy: Context->getPrintingPolicy());
1303	ResultStr += Name;
1304	}
1305	}
1306	if (OMD->isVariadic())
1307	ResultStr += ", ...";
1308	ResultStr += ") ";
1309
1310	if (FPRetType) {
1311	ResultStr += ")"; // close the precedence "scope" for "*".
1312
1313	// Now, emit the argument types (if any).
1314	if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(Val: FPRetType)) {
1315	ResultStr += "(";
1316	for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1317	if (i) ResultStr += ", ";
1318	std::string ParamStr =
1319	FT->getParamType(i).getAsString(Policy: Context->getPrintingPolicy());
1320	ResultStr += ParamStr;
1321	}
1322	if (FT->isVariadic()) {
1323	if (FT->getNumParams())
1324	ResultStr += ", ";
1325	ResultStr += "...";
1326	}
1327	ResultStr += ")";
1328	} else {
1329	ResultStr += "()";
1330	}
1331	}
1332	}
1333
1334	void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
1335	ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(Val: OID);
1336	ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(Val: OID);
1337	assert((IMD || CID) && "Unknown implementation type");
1338
1339	if (IMD) {
1340	if (IMD->getIvarRBraceLoc().isValid()) {
1341	ReplaceText(Start: IMD->getBeginLoc(), OrigLength: 1, Str: "/** ");
1342	ReplaceText(Start: IMD->getIvarRBraceLoc(), OrigLength: 1, Str: "**/ ");
1343	}
1344	else {
1345	InsertText(Loc: IMD->getBeginLoc(), Str: "// ");
1346	}
1347	}
1348	else
1349	InsertText(Loc: CID->getBeginLoc(), Str: "// ");
1350
1351	for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
1352	if (!OMD->getBody())
1353	continue;
1354	std::string ResultStr;
1355	RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1356	SourceLocation LocStart = OMD->getBeginLoc();
1357	SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1358
1359	const char *startBuf = SM->getCharacterData(LocStart);
1360	const char *endBuf = SM->getCharacterData(LocEnd);
1361	ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1362	}
1363
1364	for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
1365	if (!OMD->getBody())
1366	continue;
1367	std::string ResultStr;
1368	RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1369	SourceLocation LocStart = OMD->getBeginLoc();
1370	SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1371
1372	const char *startBuf = SM->getCharacterData(LocStart);
1373	const char *endBuf = SM->getCharacterData(LocEnd);
1374	ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1375	}
1376	for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
1377	RewritePropertyImplDecl(I, IMD, CID);
1378
1379	InsertText(Loc: IMD ? IMD->getEndLoc() : CID->getEndLoc(), Str: "// ");
1380	}
1381
1382	void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
1383	// Do not synthesize more than once.
1384	if (ObjCSynthesizedStructs.count(Ptr: ClassDecl))
1385	return;
1386	// Make sure super class's are written before current class is written.
1387	ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
1388	while (SuperClass) {
1389	RewriteInterfaceDecl(ClassDecl: SuperClass);
1390	SuperClass = SuperClass->getSuperClass();
1391	}
1392	std::string ResultStr;
1393	if (!ObjCWrittenInterfaces.count(Ptr: ClassDecl->getCanonicalDecl())) {
1394	// we haven't seen a forward decl - generate a typedef.
1395	RewriteOneForwardClassDecl(ForwardDecl: ClassDecl, typedefString&: ResultStr);
1396	RewriteIvarOffsetSymbols(CDecl: ClassDecl, Result&: ResultStr);
1397
1398	RewriteObjCInternalStruct(CDecl: ClassDecl, Result&: ResultStr);
1399	// Mark this typedef as having been written into its c++ equivalent.
1400	ObjCWrittenInterfaces.insert(Ptr: ClassDecl->getCanonicalDecl());
1401
1402	for (auto *I : ClassDecl->instance_properties())
1403	RewriteProperty(I);
1404	for (auto *I : ClassDecl->instance_methods())
1405	RewriteMethodDeclaration(I);
1406	for (auto *I : ClassDecl->class_methods())
1407	RewriteMethodDeclaration(I);
1408
1409	// Lastly, comment out the @end.
1410	ReplaceText(Start: ClassDecl->getAtEndRange().getBegin(), OrigLength: strlen(s: "@end"),
1411	Str: "/* @end */\n");
1412	}
1413	}
1414
1415	Stmt *RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
1416	SourceRange OldRange = PseudoOp->getSourceRange();
1417
1418	// We just magically know some things about the structure of this
1419	// expression.
1420	ObjCMessageExpr *OldMsg =
1421	cast<ObjCMessageExpr>(Val: PseudoOp->getSemanticExpr(
1422	index: PseudoOp->getNumSemanticExprs() - 1));
1423
1424	// Because the rewriter doesn't allow us to rewrite rewritten code,
1425	// we need to suppress rewriting the sub-statements.
1426	Expr *Base;
1427	SmallVector<Expr*, 2> Args;
1428	{
1429	DisableReplaceStmtScope S(*this);
1430
1431	// Rebuild the base expression if we have one.
1432	Base = nullptr;
1433	if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1434	Base = OldMsg->getInstanceReceiver();
1435	Base = cast<OpaqueValueExpr>(Val: Base)->getSourceExpr();
1436	Base = cast<Expr>(Val: RewriteFunctionBodyOrGlobalInitializer(Base));
1437	}
1438
1439	unsigned numArgs = OldMsg->getNumArgs();
1440	for (unsigned i = 0; i < numArgs; i++) {
1441	Expr *Arg = OldMsg->getArg(Arg: i);
1442	if (isa<OpaqueValueExpr>(Val: Arg))
1443	Arg = cast<OpaqueValueExpr>(Val: Arg)->getSourceExpr();
1444	Arg = cast<Expr>(Val: RewriteFunctionBodyOrGlobalInitializer(Arg));
1445	Args.push_back(Elt: Arg);
1446	}
1447	}
1448
1449	// TODO: avoid this copy.
1450	SmallVector<SourceLocation, 1> SelLocs;
1451	OldMsg->getSelectorLocs(SelLocs);
1452
1453	ObjCMessageExpr *NewMsg = nullptr;
1454	switch (OldMsg->getReceiverKind()) {
1455	case ObjCMessageExpr::Class:
1456	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1457	OldMsg->getValueKind(),
1458	OldMsg->getLeftLoc(),
1459	OldMsg->getClassReceiverTypeInfo(),
1460	OldMsg->getSelector(),
1461	SelLocs,
1462	OldMsg->getMethodDecl(),
1463	Args,
1464	OldMsg->getRightLoc(),
1465	OldMsg->isImplicit());
1466	break;
1467
1468	case ObjCMessageExpr::Instance:
1469	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1470	OldMsg->getValueKind(),
1471	OldMsg->getLeftLoc(),
1472	Base,
1473	OldMsg->getSelector(),
1474	SelLocs,
1475	OldMsg->getMethodDecl(),
1476	Args,
1477	OldMsg->getRightLoc(),
1478	OldMsg->isImplicit());
1479	break;
1480
1481	case ObjCMessageExpr::SuperClass:
1482	case ObjCMessageExpr::SuperInstance:
1483	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1484	OldMsg->getValueKind(),
1485	OldMsg->getLeftLoc(),
1486	OldMsg->getSuperLoc(),
1487	OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1488	OldMsg->getSuperType(),
1489	OldMsg->getSelector(),
1490	SelLocs,
1491	OldMsg->getMethodDecl(),
1492	Args,
1493	OldMsg->getRightLoc(),
1494	OldMsg->isImplicit());
1495	break;
1496	}
1497
1498	Stmt *Replacement = SynthMessageExpr(Exp: NewMsg);
1499	ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1500	return Replacement;
1501	}
1502
1503	Stmt *RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
1504	SourceRange OldRange = PseudoOp->getSourceRange();
1505
1506	// We just magically know some things about the structure of this
1507	// expression.
1508	ObjCMessageExpr *OldMsg =
1509	cast<ObjCMessageExpr>(Val: PseudoOp->getResultExpr()->IgnoreImplicit());
1510
1511	// Because the rewriter doesn't allow us to rewrite rewritten code,
1512	// we need to suppress rewriting the sub-statements.
1513	Expr *Base = nullptr;
1514	SmallVector<Expr*, 1> Args;
1515	{
1516	DisableReplaceStmtScope S(*this);
1517	// Rebuild the base expression if we have one.
1518	if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1519	Base = OldMsg->getInstanceReceiver();
1520	Base = cast<OpaqueValueExpr>(Val: Base)->getSourceExpr();
1521	Base = cast<Expr>(Val: RewriteFunctionBodyOrGlobalInitializer(Base));
1522	}
1523	unsigned numArgs = OldMsg->getNumArgs();
1524	for (unsigned i = 0; i < numArgs; i++) {
1525	Expr *Arg = OldMsg->getArg(Arg: i);
1526	if (isa<OpaqueValueExpr>(Val: Arg))
1527	Arg = cast<OpaqueValueExpr>(Val: Arg)->getSourceExpr();
1528	Arg = cast<Expr>(Val: RewriteFunctionBodyOrGlobalInitializer(Arg));
1529	Args.push_back(Elt: Arg);
1530	}
1531	}
1532
1533	// Intentionally empty.
1534	SmallVector<SourceLocation, 1> SelLocs;
1535
1536	ObjCMessageExpr *NewMsg = nullptr;
1537	switch (OldMsg->getReceiverKind()) {
1538	case ObjCMessageExpr::Class:
1539	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1540	OldMsg->getValueKind(),
1541	OldMsg->getLeftLoc(),
1542	OldMsg->getClassReceiverTypeInfo(),
1543	OldMsg->getSelector(),
1544	SelLocs,
1545	OldMsg->getMethodDecl(),
1546	Args,
1547	OldMsg->getRightLoc(),
1548	OldMsg->isImplicit());
1549	break;
1550
1551	case ObjCMessageExpr::Instance:
1552	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1553	OldMsg->getValueKind(),
1554	OldMsg->getLeftLoc(),
1555	Base,
1556	OldMsg->getSelector(),
1557	SelLocs,
1558	OldMsg->getMethodDecl(),
1559	Args,
1560	OldMsg->getRightLoc(),
1561	OldMsg->isImplicit());
1562	break;
1563
1564	case ObjCMessageExpr::SuperClass:
1565	case ObjCMessageExpr::SuperInstance:
1566	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1567	OldMsg->getValueKind(),
1568	OldMsg->getLeftLoc(),
1569	OldMsg->getSuperLoc(),
1570	OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1571	OldMsg->getSuperType(),
1572	OldMsg->getSelector(),
1573	SelLocs,
1574	OldMsg->getMethodDecl(),
1575	Args,
1576	OldMsg->getRightLoc(),
1577	OldMsg->isImplicit());
1578	break;
1579	}
1580
1581	Stmt *Replacement = SynthMessageExpr(Exp: NewMsg);
1582	ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1583	return Replacement;
1584	}
1585
1586	/// SynthCountByEnumWithState - To print:
1587	/// ((NSUInteger (*)
1588	/// (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1589	/// (void *)objc_msgSend)((id)l_collection,
1590	/// sel_registerName(
1591	/// "countByEnumeratingWithState:objects:count:"),
1592	/// &enumState,
1593	/// (id *)__rw_items, (NSUInteger)16)
1594	///
1595	void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
1596	buf += "((_WIN_NSUInteger (*) (id, SEL, struct __objcFastEnumerationState *, "
1597	"id *, _WIN_NSUInteger))(void *)objc_msgSend)";
1598	buf += "\n\t\t";
1599	buf += "((id)l_collection,\n\t\t";
1600	buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
1601	buf += "\n\t\t";
1602	buf += "&enumState, "
1603	"(id *)__rw_items, (_WIN_NSUInteger)16)";
1604	}
1605
1606	/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
1607	/// statement to exit to its outer synthesized loop.
1608	///
1609	Stmt *RewriteModernObjC::RewriteBreakStmt(BreakStmt *S) {
1610	if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Val: Stmts.back()))
1611	return S;
1612	// replace break with goto __break_label
1613	std::string buf;
1614
1615	SourceLocation startLoc = S->getBeginLoc();
1616	buf = "goto __break_label_";
1617	buf += utostr(X: ObjCBcLabelNo.back());
1618	ReplaceText(Start: startLoc, OrigLength: strlen(s: "break"), Str: buf);
1619
1620	return nullptr;
1621	}
1622
1623	void RewriteModernObjC::ConvertSourceLocationToLineDirective(
1624	SourceLocation Loc,
1625	std::string &LineString) {
1626	if (Loc.isFileID() && GenerateLineInfo) {
1627	LineString += "\n#line ";
1628	PresumedLoc PLoc = SM->getPresumedLoc(Loc);
1629	LineString += utostr(X: PLoc.getLine());
1630	LineString += " \"";
1631	LineString += Lexer::Stringify(Str: PLoc.getFilename());
1632	LineString += "\"\n";
1633	}
1634	}
1635
1636	/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
1637	/// statement to continue with its inner synthesized loop.
1638	///
1639	Stmt *RewriteModernObjC::RewriteContinueStmt(ContinueStmt *S) {
1640	if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Val: Stmts.back()))
1641	return S;
1642	// replace continue with goto __continue_label
1643	std::string buf;
1644
1645	SourceLocation startLoc = S->getBeginLoc();
1646	buf = "goto __continue_label_";
1647	buf += utostr(X: ObjCBcLabelNo.back());
1648	ReplaceText(Start: startLoc, OrigLength: strlen(s: "continue"), Str: buf);
1649
1650	return nullptr;
1651	}
1652
1653	/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
1654	/// It rewrites:
1655	/// for ( type elem in collection) { stmts; }
1656
1657	/// Into:
1658	/// {
1659	/// type elem;
1660	/// struct __objcFastEnumerationState enumState = { 0 };
1661	/// id __rw_items[16];
1662	/// id l_collection = (id)collection;
1663	/// NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
1664	/// objects:__rw_items count:16];
1665	/// if (limit) {
1666	/// unsigned long startMutations = *enumState.mutationsPtr;
1667	/// do {
1668	/// unsigned long counter = 0;
1669	/// do {
1670	/// if (startMutations != *enumState.mutationsPtr)
1671	/// objc_enumerationMutation(l_collection);
1672	/// elem = (type)enumState.itemsPtr[counter++];
1673	/// stmts;
1674	/// __continue_label: ;
1675	/// } while (counter < limit);
1676	/// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1677	/// objects:__rw_items count:16]));
1678	/// elem = nil;
1679	/// __break_label: ;
1680	/// }
1681	/// else
1682	/// elem = nil;
1683	/// }
1684	///
1685	Stmt *RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
1686	SourceLocation OrigEnd) {
1687	assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
1688	assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
1689	"ObjCForCollectionStmt Statement stack mismatch");
1690	assert(!ObjCBcLabelNo.empty() &&
1691	"ObjCForCollectionStmt - Label No stack empty");
1692
1693	SourceLocation startLoc = S->getBeginLoc();
1694	const char *startBuf = SM->getCharacterData(SL: startLoc);
1695	StringRef elementName;
1696	std::string elementTypeAsString;
1697	std::string buf;
1698	// line directive first.
1699	SourceLocation ForEachLoc = S->getForLoc();
1700	ConvertSourceLocationToLineDirective(Loc: ForEachLoc, LineString&: buf);
1701	buf += "{\n\t";
1702	if (DeclStmt *DS = dyn_cast<DeclStmt>(Val: S->getElement())) {
1703	// type elem;
1704	NamedDecl* D = cast<NamedDecl>(Val: DS->getSingleDecl());
1705	QualType ElementType = cast<ValueDecl>(Val: D)->getType();
1706	if (ElementType->isObjCQualifiedIdType() ||
1707	ElementType->isObjCQualifiedInterfaceType())
1708	// Simply use 'id' for all qualified types.
1709	elementTypeAsString = "id";
1710	else
1711	elementTypeAsString = ElementType.getAsString(Policy: Context->getPrintingPolicy());
1712	buf += elementTypeAsString;
1713	buf += " ";
1714	elementName = D->getName();
1715	buf += elementName;
1716	buf += ";\n\t";
1717	}
1718	else {
1719	DeclRefExpr *DR = cast<DeclRefExpr>(Val: S->getElement());
1720	elementName = DR->getDecl()->getName();
1721	ValueDecl *VD = DR->getDecl();
1722	if (VD->getType()->isObjCQualifiedIdType() ||
1723	VD->getType()->isObjCQualifiedInterfaceType())
1724	// Simply use 'id' for all qualified types.
1725	elementTypeAsString = "id";
1726	else
1727	elementTypeAsString = VD->getType().getAsString(Policy: Context->getPrintingPolicy());
1728	}
1729
1730	// struct __objcFastEnumerationState enumState = { 0 };
1731	buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
1732	// id __rw_items[16];
1733	buf += "id __rw_items[16];\n\t";
1734	// id l_collection = (id)
1735	buf += "id l_collection = (id)";
1736	// Find start location of 'collection' the hard way!
1737	const char *startCollectionBuf = startBuf;
1738	startCollectionBuf += 3; // skip 'for'
1739	startCollectionBuf = strchr(s: startCollectionBuf, c: '(');
1740	startCollectionBuf++; // skip '('
1741	// find 'in' and skip it.
1742	while (*startCollectionBuf != ' ' ||
1743	*(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
1744	(*(startCollectionBuf+3) != ' ' &&
1745	*(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
1746	startCollectionBuf++;
1747	startCollectionBuf += 3;
1748
1749	// Replace: "for (type element in" with string constructed thus far.
1750	ReplaceText(Start: startLoc, OrigLength: startCollectionBuf - startBuf, Str: buf);
1751	// Replace ')' in for '(' type elem in collection ')' with ';'
1752	SourceLocation rightParenLoc = S->getRParenLoc();
1753	const char *rparenBuf = SM->getCharacterData(SL: rightParenLoc);
1754	SourceLocation lparenLoc = startLoc.getLocWithOffset(Offset: rparenBuf-startBuf);
1755	buf = ";\n\t";
1756
1757	// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
1758	// objects:__rw_items count:16];
1759	// which is synthesized into:
1760	// NSUInteger limit =
1761	// ((NSUInteger (*)
1762	// (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1763	// (void *)objc_msgSend)((id)l_collection,
1764	// sel_registerName(
1765	// "countByEnumeratingWithState:objects:count:"),
1766	// (struct __objcFastEnumerationState *)&state,
1767	// (id *)__rw_items, (NSUInteger)16);
1768	buf += "_WIN_NSUInteger limit =\n\t\t";
1769	SynthCountByEnumWithState(buf);
1770	buf += ";\n\t";
1771	/// if (limit) {
1772	/// unsigned long startMutations = *enumState.mutationsPtr;
1773	/// do {
1774	/// unsigned long counter = 0;
1775	/// do {
1776	/// if (startMutations != *enumState.mutationsPtr)
1777	/// objc_enumerationMutation(l_collection);
1778	/// elem = (type)enumState.itemsPtr[counter++];
1779	buf += "if (limit) {\n\t";
1780	buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
1781	buf += "do {\n\t\t";
1782	buf += "unsigned long counter = 0;\n\t\t";
1783	buf += "do {\n\t\t\t";
1784	buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
1785	buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
1786	buf += elementName;
1787	buf += " = (";
1788	buf += elementTypeAsString;
1789	buf += ")enumState.itemsPtr[counter++];";
1790	// Replace ')' in for '(' type elem in collection ')' with all of these.
1791	ReplaceText(Start: lparenLoc, OrigLength: 1, Str: buf);
1792
1793	/// __continue_label: ;
1794	/// } while (counter < limit);
1795	/// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1796	/// objects:__rw_items count:16]));
1797	/// elem = nil;
1798	/// __break_label: ;
1799	/// }
1800	/// else
1801	/// elem = nil;
1802	/// }
1803	///
1804	buf = ";\n\t";
1805	buf += "__continue_label_";
1806	buf += utostr(X: ObjCBcLabelNo.back());
1807	buf += ": ;";
1808	buf += "\n\t\t";
1809	buf += "} while (counter < limit);\n\t";
1810	buf += "} while ((limit = ";
1811	SynthCountByEnumWithState(buf);
1812	buf += "));\n\t";
1813	buf += elementName;
1814	buf += " = ((";
1815	buf += elementTypeAsString;
1816	buf += ")0);\n\t";
1817	buf += "__break_label_";
1818	buf += utostr(X: ObjCBcLabelNo.back());
1819	buf += ": ;\n\t";
1820	buf += "}\n\t";
1821	buf += "else\n\t\t";
1822	buf += elementName;
1823	buf += " = ((";
1824	buf += elementTypeAsString;
1825	buf += ")0);\n\t";
1826	buf += "}\n";
1827
1828	// Insert all these *after* the statement body.
1829	// FIXME: If this should support Obj-C++, support CXXTryStmt
1830	if (isa<CompoundStmt>(Val: S->getBody())) {
1831	SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(Offset: 1);
1832	InsertText(Loc: endBodyLoc, Str: buf);
1833	} else {
1834	/* Need to treat single statements specially. For example:
1835	*
1836	* for (A *a in b) if (stuff()) break;
1837	* for (A *a in b) xxxyy;
1838	*
1839	* The following code simply scans ahead to the semi to find the actual end.
1840	*/
1841	const char *stmtBuf = SM->getCharacterData(SL: OrigEnd);
1842	const char *semiBuf = strchr(s: stmtBuf, c: ';');
1843	assert(semiBuf && "Can't find ';'");
1844	SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(Offset: semiBuf-stmtBuf+1);
1845	InsertText(Loc: endBodyLoc, Str: buf);
1846	}
1847	Stmts.pop_back();
1848	ObjCBcLabelNo.pop_back();
1849	return nullptr;
1850	}
1851
1852	static void Write_RethrowObject(std::string &buf) {
1853	buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
1854	buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
1855	buf += "\tid rethrow;\n";
1856	buf += "\t} _fin_force_rethow(_rethrow);";
1857	}
1858
1859	/// RewriteObjCSynchronizedStmt -
1860	/// This routine rewrites @synchronized(expr) stmt;
1861	/// into:
1862	/// objc_sync_enter(expr);
1863	/// @try stmt @finally { objc_sync_exit(expr); }
1864	///
1865	Stmt *RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
1866	// Get the start location and compute the semi location.
1867	SourceLocation startLoc = S->getBeginLoc();
1868	const char *startBuf = SM->getCharacterData(SL: startLoc);
1869
1870	assert((*startBuf == '@') && "bogus @synchronized location");
1871
1872	std::string buf;
1873	SourceLocation SynchLoc = S->getAtSynchronizedLoc();
1874	ConvertSourceLocationToLineDirective(Loc: SynchLoc, LineString&: buf);
1875	buf += "{ id _rethrow = 0; id _sync_obj = (id)";
1876
1877	const char *lparenBuf = startBuf;
1878	while (*lparenBuf != '(') lparenBuf++;
1879	ReplaceText(Start: startLoc, OrigLength: lparenBuf-startBuf+1, Str: buf);
1880
1881	buf = "; objc_sync_enter(_sync_obj);\n";
1882	buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
1883	buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
1884	buf += "\n\tid sync_exit;";
1885	buf += "\n\t} _sync_exit(_sync_obj);\n";
1886
1887	// We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
1888	// the sync expression is typically a message expression that's already
1889	// been rewritten! (which implies the SourceLocation's are invalid).
1890	SourceLocation RParenExprLoc = S->getSynchBody()->getBeginLoc();
1891	const char *RParenExprLocBuf = SM->getCharacterData(SL: RParenExprLoc);
1892	while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
1893	RParenExprLoc = startLoc.getLocWithOffset(Offset: RParenExprLocBuf-startBuf);
1894
1895	SourceLocation LBranceLoc = S->getSynchBody()->getBeginLoc();
1896	const char *LBraceLocBuf = SM->getCharacterData(SL: LBranceLoc);
1897	assert (*LBraceLocBuf == '{');
1898	ReplaceText(Start: RParenExprLoc, OrigLength: (LBraceLocBuf - SM->getCharacterData(SL: RParenExprLoc) + 1), Str: buf);
1899
1900	SourceLocation startRBraceLoc = S->getSynchBody()->getEndLoc();
1901	assert((*SM->getCharacterData(startRBraceLoc) == '}') &&
1902	"bogus @synchronized block");
1903
1904	buf = "} catch (id e) {_rethrow = e;}\n";
1905	Write_RethrowObject(buf);
1906	buf += "}\n";
1907	buf += "}\n";
1908
1909	ReplaceText(Start: startRBraceLoc, OrigLength: 1, Str: buf);
1910
1911	return nullptr;
1912	}
1913
1914	void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
1915	{
1916	// Perform a bottom up traversal of all children.
1917	for (Stmt *SubStmt : S->children())
1918	if (SubStmt)
1919	WarnAboutReturnGotoStmts(S: SubStmt);
1920
1921	if (isa<ReturnStmt>(Val: S) || isa<GotoStmt>(Val: S)) {
1922	Diags.Report(Loc: Context->getFullLoc(Loc: S->getBeginLoc()),
1923	DiagID: TryFinallyContainsReturnDiag);
1924	}
1925	}
1926
1927	Stmt *RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S) {
1928	SourceLocation startLoc = S->getAtLoc();
1929	ReplaceText(Start: startLoc, OrigLength: strlen(s: "@autoreleasepool"), Str: "/* @autoreleasepool */");
1930	ReplaceText(Start: S->getSubStmt()->getBeginLoc(), OrigLength: 1,
1931	Str: "{ __AtAutoreleasePool __autoreleasepool; ");
1932
1933	return nullptr;
1934	}
1935
1936	Stmt *RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
1937	ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
1938	bool noCatch = S->getNumCatchStmts() == 0;
1939	std::string buf;
1940	SourceLocation TryLocation = S->getAtTryLoc();
1941	ConvertSourceLocationToLineDirective(Loc: TryLocation, LineString&: buf);
1942
1943	if (finalStmt) {
1944	if (noCatch)
1945	buf += "{ id volatile _rethrow = 0;\n";
1946	else {
1947	buf += "{ id volatile _rethrow = 0;\ntry {\n";
1948	}
1949	}
1950	// Get the start location and compute the semi location.
1951	SourceLocation startLoc = S->getBeginLoc();
1952	const char *startBuf = SM->getCharacterData(SL: startLoc);
1953
1954	assert((*startBuf == '@') && "bogus @try location");
1955	if (finalStmt)
1956	ReplaceText(Start: startLoc, OrigLength: 1, Str: buf);
1957	else
1958	// @try -> try
1959	ReplaceText(Start: startLoc, OrigLength: 1, Str: "");
1960
1961	for (ObjCAtCatchStmt *Catch : S->catch_stmts()) {
1962	VarDecl *catchDecl = Catch->getCatchParamDecl();
1963
1964	startLoc = Catch->getBeginLoc();
1965	bool AtRemoved = false;
1966	if (catchDecl) {
1967	QualType t = catchDecl->getType();
1968	if (const ObjCObjectPointerType *Ptr =
1969	t->getAs<ObjCObjectPointerType>()) {
1970	// Should be a pointer to a class.
1971	ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
1972	if (IDecl) {
1973	std::string Result;
1974	ConvertSourceLocationToLineDirective(Catch->getBeginLoc(), Result);
1975
1976	startBuf = SM->getCharacterData(startLoc);
1977	assert((*startBuf == '@') && "bogus @catch location");
1978	SourceLocation rParenLoc = Catch->getRParenLoc();
1979	const char *rParenBuf = SM->getCharacterData(rParenLoc);
1980
1981	// _objc_exc_Foo *_e as argument to catch.
1982	Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
1983	Result += " *_"; Result += catchDecl->getNameAsString();
1984	Result += ")";
1985	ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
1986	// Foo *e = (Foo *)_e;
1987	Result.clear();
1988	Result = "{ ";
1989	Result += IDecl->getNameAsString();
1990	Result += " *"; Result += catchDecl->getNameAsString();
1991	Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
1992	Result += "_"; Result += catchDecl->getNameAsString();
1993
1994	Result += "; ";
1995	SourceLocation lBraceLoc = Catch->getCatchBody()->getBeginLoc();
1996	ReplaceText(lBraceLoc, 1, Result);
1997	AtRemoved = true;
1998	}
1999	}
2000	}
2001	if (!AtRemoved)
2002	// @catch -> catch
2003	ReplaceText(startLoc, 1, "");
2004
2005	}
2006	if (finalStmt) {
2007	buf.clear();
2008	SourceLocation FinallyLoc = finalStmt->getBeginLoc();
2009
2010	if (noCatch) {
2011	ConvertSourceLocationToLineDirective(Loc: FinallyLoc, LineString&: buf);
2012	buf += "catch (id e) {_rethrow = e;}\n";
2013	}
2014	else {
2015	buf += "}\n";
2016	ConvertSourceLocationToLineDirective(Loc: FinallyLoc, LineString&: buf);
2017	buf += "catch (id e) {_rethrow = e;}\n";
2018	}
2019
2020	SourceLocation startFinalLoc = finalStmt->getBeginLoc();
2021	ReplaceText(Start: startFinalLoc, OrigLength: 8, Str: buf);
2022	Stmt *body = finalStmt->getFinallyBody();
2023	SourceLocation startFinalBodyLoc = body->getBeginLoc();
2024	buf.clear();
2025	Write_RethrowObject(buf);
2026	ReplaceText(Start: startFinalBodyLoc, OrigLength: 1, Str: buf);
2027
2028	SourceLocation endFinalBodyLoc = body->getEndLoc();
2029	ReplaceText(Start: endFinalBodyLoc, OrigLength: 1, Str: "}\n}");
2030	// Now check for any return/continue/go statements within the @try.
2031	WarnAboutReturnGotoStmts(S: S->getTryBody());
2032	}
2033
2034	return nullptr;
2035	}
2036
2037	// This can't be done with ReplaceStmt(S, ThrowExpr), since
2038	// the throw expression is typically a message expression that's already
2039	// been rewritten! (which implies the SourceLocation's are invalid).
2040	Stmt *RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
2041	// Get the start location and compute the semi location.
2042	SourceLocation startLoc = S->getBeginLoc();
2043	const char *startBuf = SM->getCharacterData(SL: startLoc);
2044
2045	assert((*startBuf == '@') && "bogus @throw location");
2046
2047	std::string buf;
2048	/* void objc_exception_throw(id) __attribute__((noreturn)); */
2049	if (S->getThrowExpr())
2050	buf = "objc_exception_throw(";
2051	else
2052	buf = "throw";
2053
2054	// handle "@ throw" correctly.
2055	const char *wBuf = strchr(s: startBuf, c: 'w');
2056	assert((*wBuf == 'w') && "@throw: can't find 'w'");
2057	ReplaceText(Start: startLoc, OrigLength: wBuf-startBuf+1, Str: buf);
2058
2059	SourceLocation endLoc = S->getEndLoc();
2060	const char *endBuf = SM->getCharacterData(SL: endLoc);
2061	const char *semiBuf = strchr(s: endBuf, c: ';');
2062	assert((*semiBuf == ';') && "@throw: can't find ';'");
2063	SourceLocation semiLoc = startLoc.getLocWithOffset(Offset: semiBuf-startBuf);
2064	if (S->getThrowExpr())
2065	ReplaceText(Start: semiLoc, OrigLength: 1, Str: ");");
2066	return nullptr;
2067	}
2068
2069	Stmt *RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
2070	// Create a new string expression.
2071	std::string StrEncoding;
2072	Context->getObjCEncodingForType(T: Exp->getEncodedType(), S&: StrEncoding);
2073	Expr *Replacement = getStringLiteral(Str: StrEncoding);
2074	ReplaceStmt(Exp, Replacement);
2075
2076	// Replace this subexpr in the parent.
2077	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2078	return Replacement;
2079	}
2080
2081	Stmt *RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
2082	if (!SelGetUidFunctionDecl)
2083	SynthSelGetUidFunctionDecl();
2084	assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
2085	// Create a call to sel_registerName("selName").
2086	SmallVector<Expr*, 8> SelExprs;
2087	SelExprs.push_back(getStringLiteral(Str: Exp->getSelector().getAsString()));
2088	CallExpr *SelExp = SynthesizeCallToFunctionDecl(FD: SelGetUidFunctionDecl,
2089	Args: SelExprs);
2090	ReplaceStmt(Exp, SelExp);
2091	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2092	return SelExp;
2093	}
2094
2095	CallExpr *
2096	RewriteModernObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
2097	ArrayRef<Expr *> Args,
2098	SourceLocation StartLoc,
2099	SourceLocation EndLoc) {
2100	// Get the type, we will need to reference it in a couple spots.
2101	QualType msgSendType = FD->getType();
2102
2103	// Create a reference to the objc_msgSend() declaration.
2104	DeclRefExpr *DRE = new (Context) DeclRefExpr(*Context, FD, false, msgSendType,
2105	VK_LValue, SourceLocation());
2106
2107	// Now, we cast the reference to a pointer to the objc_msgSend type.
2108	QualType pToFunc = Context->getPointerType(T: msgSendType);
2109	ImplicitCastExpr *ICE =
2110	ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
2111	DRE, nullptr, VK_PRValue, FPOptionsOverride());
2112
2113	const auto *FT = msgSendType->castAs<FunctionType>();
2114	CallExpr *Exp =
2115	CallExpr::Create(Ctx: *Context, Fn: ICE, Args, Ty: FT->getCallResultType(*Context),
2116	VK: VK_PRValue, RParenLoc: EndLoc, FPFeatures: FPOptionsOverride());
2117	return Exp;
2118	}
2119
2120	static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
2121	const char *&startRef, const char *&endRef) {
2122	while (startBuf < endBuf) {
2123	if (*startBuf == '<')
2124	startRef = startBuf; // mark the start.
2125	if (*startBuf == '>') {
2126	if (startRef && *startRef == '<') {
2127	endRef = startBuf; // mark the end.
2128	return true;
2129	}
2130	return false;
2131	}
2132	startBuf++;
2133	}
2134	return false;
2135	}
2136
2137	static void scanToNextArgument(const char *&argRef) {
2138	int angle = 0;
2139	while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
2140	if (*argRef == '<')
2141	angle++;
2142	else if (*argRef == '>')
2143	angle--;
2144	argRef++;
2145	}
2146	assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
2147	}
2148
2149	bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
2150	if (T->isObjCQualifiedIdType())
2151	return true;
2152	if (const PointerType *PT = T->getAs<PointerType>()) {
2153	if (PT->getPointeeType()->isObjCQualifiedIdType())
2154	return true;
2155	}
2156	if (T->isObjCObjectPointerType()) {
2157	T = T->getPointeeType();
2158	return T->isObjCQualifiedInterfaceType();
2159	}
2160	if (T->isArrayType()) {
2161	QualType ElemTy = Context->getBaseElementType(QT: T);
2162	return needToScanForQualifiers(T: ElemTy);
2163	}
2164	return false;
2165	}
2166
2167	void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
2168	QualType Type = E->getType();
2169	if (needToScanForQualifiers(T: Type)) {
2170	SourceLocation Loc, EndLoc;
2171
2172	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(Val: E)) {
2173	Loc = ECE->getLParenLoc();
2174	EndLoc = ECE->getRParenLoc();
2175	} else {
2176	Loc = E->getBeginLoc();
2177	EndLoc = E->getEndLoc();
2178	}
2179	// This will defend against trying to rewrite synthesized expressions.
2180	if (Loc.isInvalid() || EndLoc.isInvalid())
2181	return;
2182
2183	const char *startBuf = SM->getCharacterData(SL: Loc);
2184	const char *endBuf = SM->getCharacterData(SL: EndLoc);
2185	const char *startRef = nullptr, *endRef = nullptr;
2186	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2187	// Get the locations of the startRef, endRef.
2188	SourceLocation LessLoc = Loc.getLocWithOffset(Offset: startRef-startBuf);
2189	SourceLocation GreaterLoc = Loc.getLocWithOffset(Offset: endRef-startBuf+1);
2190	// Comment out the protocol references.
2191	InsertText(Loc: LessLoc, Str: "/*");
2192	InsertText(Loc: GreaterLoc, Str: "*/");
2193	}
2194	}
2195	}
2196
2197	void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
2198	SourceLocation Loc;
2199	QualType Type;
2200	const FunctionProtoType *proto = nullptr;
2201	if (VarDecl *VD = dyn_cast<VarDecl>(Val: Dcl)) {
2202	Loc = VD->getLocation();
2203	Type = VD->getType();
2204	}
2205	else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: Dcl)) {
2206	Loc = FD->getLocation();
2207	// Check for ObjC 'id' and class types that have been adorned with protocol
2208	// information (id<p>, C<p>*). The protocol references need to be rewritten!
2209	const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2210	assert(funcType && "missing function type");
2211	proto = dyn_cast<FunctionProtoType>(Val: funcType);
2212	if (!proto)
2213	return;
2214	Type = proto->getReturnType();
2215	}
2216	else if (FieldDecl *FD = dyn_cast<FieldDecl>(Val: Dcl)) {
2217	Loc = FD->getLocation();
2218	Type = FD->getType();
2219	}
2220	else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Val: Dcl)) {
2221	Loc = TD->getLocation();
2222	Type = TD->getUnderlyingType();
2223	}
2224	else
2225	return;
2226
2227	if (needToScanForQualifiers(T: Type)) {
2228	// Since types are unique, we need to scan the buffer.
2229
2230	const char *endBuf = SM->getCharacterData(SL: Loc);
2231	const char *startBuf = endBuf;
2232	while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
2233	startBuf--; // scan backward (from the decl location) for return type.
2234	const char *startRef = nullptr, *endRef = nullptr;
2235	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2236	// Get the locations of the startRef, endRef.
2237	SourceLocation LessLoc = Loc.getLocWithOffset(Offset: startRef-endBuf);
2238	SourceLocation GreaterLoc = Loc.getLocWithOffset(Offset: endRef-endBuf+1);
2239	// Comment out the protocol references.
2240	InsertText(Loc: LessLoc, Str: "/*");
2241	InsertText(Loc: GreaterLoc, Str: "*/");
2242	}
2243	}
2244	if (!proto)
2245	return; // most likely, was a variable
2246	// Now check arguments.
2247	const char *startBuf = SM->getCharacterData(SL: Loc);
2248	const char *startFuncBuf = startBuf;
2249	for (unsigned i = 0; i < proto->getNumParams(); i++) {
2250	if (needToScanForQualifiers(T: proto->getParamType(i))) {
2251	// Since types are unique, we need to scan the buffer.
2252
2253	const char *endBuf = startBuf;
2254	// scan forward (from the decl location) for argument types.
2255	scanToNextArgument(argRef&: endBuf);
2256	const char *startRef = nullptr, *endRef = nullptr;
2257	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2258	// Get the locations of the startRef, endRef.
2259	SourceLocation LessLoc =
2260	Loc.getLocWithOffset(Offset: startRef-startFuncBuf);
2261	SourceLocation GreaterLoc =
2262	Loc.getLocWithOffset(Offset: endRef-startFuncBuf+1);
2263	// Comment out the protocol references.
2264	InsertText(Loc: LessLoc, Str: "/*");
2265	InsertText(Loc: GreaterLoc, Str: "*/");
2266	}
2267	startBuf = ++endBuf;
2268	}
2269	else {
2270	// If the function name is derived from a macro expansion, then the
2271	// argument buffer will not follow the name. Need to speak with Chris.
2272	while (*startBuf && *startBuf != ')' && *startBuf != ',')
2273	startBuf++; // scan forward (from the decl location) for argument types.
2274	startBuf++;
2275	}
2276	}
2277	}
2278
2279	void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
2280	QualType QT = ND->getType();
2281	const Type* TypePtr = QT->getAs<Type>();
2282	if (!isa<TypeOfExprType>(Val: TypePtr))
2283	return;
2284	while (isa<TypeOfExprType>(Val: TypePtr)) {
2285	const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(Val: TypePtr);
2286	QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
2287	TypePtr = QT->getAs<Type>();
2288	}
2289	// FIXME. This will not work for multiple declarators; as in:
2290	// __typeof__(a) b,c,d;
2291	std::string TypeAsString(QT.getAsString(Policy: Context->getPrintingPolicy()));
2292	SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
2293	const char *startBuf = SM->getCharacterData(SL: DeclLoc);
2294	if (ND->getInit()) {
2295	std::string Name(ND->getNameAsString());
2296	TypeAsString += " " + Name + " = ";
2297	Expr *E = ND->getInit();
2298	SourceLocation startLoc;
2299	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(Val: E))
2300	startLoc = ECE->getLParenLoc();
2301	else
2302	startLoc = E->getBeginLoc();
2303	startLoc = SM->getExpansionLoc(Loc: startLoc);
2304	const char *endBuf = SM->getCharacterData(SL: startLoc);
2305	ReplaceText(Start: DeclLoc, OrigLength: endBuf-startBuf-1, Str: TypeAsString);
2306	}
2307	else {
2308	SourceLocation X = ND->getEndLoc();
2309	X = SM->getExpansionLoc(Loc: X);
2310	const char *endBuf = SM->getCharacterData(SL: X);
2311	ReplaceText(Start: DeclLoc, OrigLength: endBuf-startBuf-1, Str: TypeAsString);
2312	}
2313	}
2314
2315	// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
2316	void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
2317	IdentifierInfo *SelGetUidIdent = &Context->Idents.get(Name: "sel_registerName");
2318	SmallVector<QualType, 16> ArgTys;
2319	ArgTys.push_back(Elt: Context->getPointerType(Context->CharTy.withConst()));
2320	QualType getFuncType =
2321	getSimpleFunctionType(result: Context->getObjCSelType(), args: ArgTys);
2322	SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2323	SourceLocation(),
2324	SourceLocation(),
2325	SelGetUidIdent, getFuncType,
2326	nullptr, SC_Extern);
2327	}
2328
2329	void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
2330	// declared in <objc/objc.h>
2331	if (FD->getIdentifier() &&
2332	FD->getName() == "sel_registerName") {
2333	SelGetUidFunctionDecl = FD;
2334	return;
2335	}
2336	RewriteObjCQualifiedInterfaceTypes(FD);
2337	}
2338
2339	void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
2340	std::string TypeString(Type.getAsString(Policy: Context->getPrintingPolicy()));
2341	const char *argPtr = TypeString.c_str();
2342	if (!strchr(s: argPtr, c: '^')) {
2343	Str += TypeString;
2344	return;
2345	}
2346	while (*argPtr) {
2347	Str += (*argPtr == '^' ? '*' : *argPtr);
2348	argPtr++;
2349	}
2350	}
2351
2352	// FIXME. Consolidate this routine with RewriteBlockPointerType.
2353	void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
2354	ValueDecl *VD) {
2355	QualType Type = VD->getType();
2356	std::string TypeString(Type.getAsString(Policy: Context->getPrintingPolicy()));
2357	const char *argPtr = TypeString.c_str();
2358	int paren = 0;
2359	while (*argPtr) {
2360	switch (*argPtr) {
2361	case '(':
2362	Str += *argPtr;
2363	paren++;
2364	break;
2365	case ')':
2366	Str += *argPtr;
2367	paren--;
2368	break;
2369	case '^':
2370	Str += '*';
2371	if (paren == 1)
2372	Str += VD->getNameAsString();
2373	break;
2374	default:
2375	Str += *argPtr;
2376	break;
2377	}
2378	argPtr++;
2379	}
2380	}
2381
2382	void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
2383	SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
2384	const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2385	const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(Val: funcType);
2386	if (!proto)
2387	return;
2388	QualType Type = proto->getReturnType();
2389	std::string FdStr = Type.getAsString(Policy: Context->getPrintingPolicy());
2390	FdStr += " ";
2391	FdStr += FD->getName();
2392	FdStr += "(";
2393	unsigned numArgs = proto->getNumParams();
2394	for (unsigned i = 0; i < numArgs; i++) {
2395	QualType ArgType = proto->getParamType(i);
2396	RewriteBlockPointerType(Str&: FdStr, Type: ArgType);
2397	if (i+1 < numArgs)
2398	FdStr += ", ";
2399	}
2400	if (FD->isVariadic()) {
2401	FdStr += (numArgs > 0) ? ", ...);\n" : "...);\n";
2402	}
2403	else
2404	FdStr += ");\n";
2405	InsertText(Loc: FunLocStart, Str: FdStr);
2406	}
2407
2408	// SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
2409	void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
2410	if (SuperConstructorFunctionDecl)
2411	return;
2412	IdentifierInfo *msgSendIdent = &Context->Idents.get(Name: "__rw_objc_super");
2413	SmallVector<QualType, 16> ArgTys;
2414	QualType argT = Context->getObjCIdType();
2415	assert(!argT.isNull() && "Can't find 'id' type");
2416	ArgTys.push_back(Elt: argT);
2417	ArgTys.push_back(Elt: argT);
2418	QualType msgSendType = getSimpleFunctionType(result: Context->getObjCIdType(),
2419	args: ArgTys);
2420	SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2421	SourceLocation(),
2422	SourceLocation(),
2423	msgSendIdent, msgSendType,
2424	nullptr, SC_Extern);
2425	}
2426
2427	// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
2428	void RewriteModernObjC::SynthMsgSendFunctionDecl() {
2429	IdentifierInfo *msgSendIdent = &Context->Idents.get(Name: "objc_msgSend");
2430	SmallVector<QualType, 16> ArgTys;
2431	QualType argT = Context->getObjCIdType();
2432	assert(!argT.isNull() && "Can't find 'id' type");
2433	ArgTys.push_back(Elt: argT);
2434	argT = Context->getObjCSelType();
2435	assert(!argT.isNull() && "Can't find 'SEL' type");
2436	ArgTys.push_back(Elt: argT);
2437	QualType msgSendType = getSimpleFunctionType(result: Context->getObjCIdType(),
2438	args: ArgTys, /*variadic=*/true);
2439	MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2440	SourceLocation(),
2441	SourceLocation(),
2442	msgSendIdent, msgSendType, nullptr,
2443	SC_Extern);
2444	}
2445
2446	// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
2447	void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
2448	IdentifierInfo *msgSendIdent = &Context->Idents.get(Name: "objc_msgSendSuper");
2449	SmallVector<QualType, 2> ArgTys;
2450	ArgTys.push_back(Elt: Context->VoidTy);
2451	QualType msgSendType = getSimpleFunctionType(result: Context->getObjCIdType(),
2452	args: ArgTys, /*variadic=*/true);
2453	MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2454	SourceLocation(),
2455	SourceLocation(),
2456	msgSendIdent, msgSendType,
2457	nullptr, SC_Extern);
2458	}
2459
2460	// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
2461	void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
2462	IdentifierInfo *msgSendIdent = &Context->Idents.get(Name: "objc_msgSend_stret");
2463	SmallVector<QualType, 16> ArgTys;
2464	QualType argT = Context->getObjCIdType();
2465	assert(!argT.isNull() && "Can't find 'id' type");
2466	ArgTys.push_back(Elt: argT);
2467	argT = Context->getObjCSelType();
2468	assert(!argT.isNull() && "Can't find 'SEL' type");
2469	ArgTys.push_back(Elt: argT);
2470	QualType msgSendType = getSimpleFunctionType(result: Context->getObjCIdType(),
2471	args: ArgTys, /*variadic=*/true);
2472	MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2473	SourceLocation(),
2474	SourceLocation(),
2475	msgSendIdent, msgSendType,
2476	nullptr, SC_Extern);
2477	}
2478
2479	// SynthMsgSendSuperStretFunctionDecl -
2480	// id objc_msgSendSuper_stret(void);
2481	void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
2482	IdentifierInfo *msgSendIdent =
2483	&Context->Idents.get(Name: "objc_msgSendSuper_stret");
2484	SmallVector<QualType, 2> ArgTys;
2485	ArgTys.push_back(Elt: Context->VoidTy);
2486	QualType msgSendType = getSimpleFunctionType(result: Context->getObjCIdType(),
2487	args: ArgTys, /*variadic=*/true);
2488	MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2489	SourceLocation(),
2490	SourceLocation(),
2491	msgSendIdent,
2492	msgSendType, nullptr,
2493	SC_Extern);
2494	}
2495
2496	// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
2497	void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
2498	IdentifierInfo *msgSendIdent = &Context->Idents.get(Name: "objc_msgSend_fpret");
2499	SmallVector<QualType, 16> ArgTys;
2500	QualType argT = Context->getObjCIdType();
2501	assert(!argT.isNull() && "Can't find 'id' type");
2502	ArgTys.push_back(Elt: argT);
2503	argT = Context->getObjCSelType();
2504	assert(!argT.isNull() && "Can't find 'SEL' type");
2505	ArgTys.push_back(Elt: argT);
2506	QualType msgSendType = getSimpleFunctionType(result: Context->DoubleTy,
2507	args: ArgTys, /*variadic=*/true);
2508	MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2509	SourceLocation(),
2510	SourceLocation(),
2511	msgSendIdent, msgSendType,
2512	nullptr, SC_Extern);
2513	}
2514
2515	// SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
2516	void RewriteModernObjC::SynthGetClassFunctionDecl() {
2517	IdentifierInfo *getClassIdent = &Context->Idents.get(Name: "objc_getClass");
2518	SmallVector<QualType, 16> ArgTys;
2519	ArgTys.push_back(Elt: Context->getPointerType(Context->CharTy.withConst()));
2520	QualType getClassType = getSimpleFunctionType(result: Context->getObjCClassType(),
2521	args: ArgTys);
2522	GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2523	SourceLocation(),
2524	SourceLocation(),
2525	getClassIdent, getClassType,
2526	nullptr, SC_Extern);
2527	}
2528
2529	// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
2530	void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
2531	IdentifierInfo *getSuperClassIdent =
2532	&Context->Idents.get(Name: "class_getSuperclass");
2533	SmallVector<QualType, 16> ArgTys;
2534	ArgTys.push_back(Elt: Context->getObjCClassType());
2535	QualType getClassType = getSimpleFunctionType(result: Context->getObjCClassType(),
2536	args: ArgTys);
2537	GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2538	SourceLocation(),
2539	SourceLocation(),
2540	getSuperClassIdent,
2541	getClassType, nullptr,
2542	SC_Extern);
2543	}
2544
2545	// SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
2546	void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
2547	IdentifierInfo *getClassIdent = &Context->Idents.get(Name: "objc_getMetaClass");
2548	SmallVector<QualType, 16> ArgTys;
2549	ArgTys.push_back(Elt: Context->getPointerType(Context->CharTy.withConst()));
2550	QualType getClassType = getSimpleFunctionType(result: Context->getObjCClassType(),
2551	args: ArgTys);
2552	GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2553	SourceLocation(),
2554	SourceLocation(),
2555	getClassIdent, getClassType,
2556	nullptr, SC_Extern);
2557	}
2558
2559	Stmt *RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
2560	assert (Exp != nullptr && "Expected non-null ObjCStringLiteral");
2561	QualType strType = getConstantStringStructType();
2562
2563	std::string S = "__NSConstantStringImpl_";
2564
2565	std::string tmpName = InFileName;
2566	unsigned i;
2567	for (i=0; i < tmpName.length(); i++) {
2568	char c = tmpName.at(n: i);
2569	// replace any non-alphanumeric characters with '_'.
2570	if (!isAlphanumeric(c))
2571	tmpName[i] = '_';
2572	}
2573	S += tmpName;
2574	S += "_";
2575	S += utostr(X: NumObjCStringLiterals++);
2576
2577	Preamble += "static __NSConstantStringImpl " + S;
2578	Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
2579	Preamble += "0x000007c8,"; // utf8_str
2580	// The pretty printer for StringLiteral handles escape characters properly.
2581	std::string prettyBufS;
2582	llvm::raw_string_ostream prettyBuf(prettyBufS);
2583	Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
2584	Preamble += prettyBuf.str();
2585	Preamble += ",";
2586	Preamble += utostr(X: Exp->getString()->getByteLength()) + "};\n";
2587
2588	VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
2589	SourceLocation(), &Context->Idents.get(Name: S),
2590	strType, nullptr, SC_Static);
2591	DeclRefExpr *DRE = new (Context)
2592	DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
2593	Expr *Unop = UnaryOperator::Create(
2594	C: const_cast<ASTContext &>(*Context), input: DRE, opc: UO_AddrOf,
2595	type: Context->getPointerType(DRE->getType()), VK: VK_PRValue, OK: OK_Ordinary,
2596	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
2597	// cast to NSConstantString *
2598	CastExpr *cast = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Exp->getType(),
2599	Kind: CK_CPointerToObjCPointerCast, E: Unop);
2600	ReplaceStmt(Exp, cast);
2601	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2602	return cast;
2603	}
2604
2605	Stmt *RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp) {
2606	unsigned IntSize =
2607	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
2608
2609	Expr *FlagExp = IntegerLiteral::Create(*Context,
2610	llvm::APInt(IntSize, Exp->getValue()),
2611	Context->IntTy, Exp->getLocation());
2612	CastExpr *cast = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Context->ObjCBuiltinBoolTy,
2613	Kind: CK_BitCast, E: FlagExp);
2614	ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
2615	cast);
2616	ReplaceStmt(Exp, PE);
2617	return PE;
2618	}
2619
2620	Stmt *RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp) {
2621	// synthesize declaration of helper functions needed in this routine.
2622	if (!SelGetUidFunctionDecl)
2623	SynthSelGetUidFunctionDecl();
2624	// use objc_msgSend() for all.
2625	if (!MsgSendFunctionDecl)
2626	SynthMsgSendFunctionDecl();
2627	if (!GetClassFunctionDecl)
2628	SynthGetClassFunctionDecl();
2629
2630	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2631	SourceLocation StartLoc = Exp->getBeginLoc();
2632	SourceLocation EndLoc = Exp->getEndLoc();
2633
2634	// Synthesize a call to objc_msgSend().
2635	SmallVector<Expr*, 4> MsgExprs;
2636	SmallVector<Expr*, 4> ClsExprs;
2637
2638	// Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
2639	ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
2640	ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
2641
2642	IdentifierInfo *clsName = BoxingClass->getIdentifier();
2643	ClsExprs.push_back(getStringLiteral(Str: clsName->getName()));
2644	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetClassFunctionDecl, Args: ClsExprs,
2645	StartLoc, EndLoc);
2646	MsgExprs.push_back(Cls);
2647
2648	// Create a call to sel_registerName("<BoxingMethod>:"), etc.
2649	// it will be the 2nd argument.
2650	SmallVector<Expr*, 4> SelExprs;
2651	SelExprs.push_back(
2652	getStringLiteral(Str: BoxingMethod->getSelector().getAsString()));
2653	CallExpr *SelExp = SynthesizeCallToFunctionDecl(FD: SelGetUidFunctionDecl,
2654	Args: SelExprs, StartLoc, EndLoc);
2655	MsgExprs.push_back(SelExp);
2656
2657	// User provided sub-expression is the 3rd, and last, argument.
2658	Expr *subExpr = Exp->getSubExpr();
2659	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: subExpr)) {
2660	QualType type = ICE->getType();
2661	const Expr *SubExpr = ICE->IgnoreParenImpCasts();
2662	CastKind CK = CK_BitCast;
2663	if (SubExpr->getType()->isIntegralType(Ctx: *Context) && type->isBooleanType())
2664	CK = CK_IntegralToBoolean;
2665	subExpr = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: type, Kind: CK, E: subExpr);
2666	}
2667	MsgExprs.push_back(Elt: subExpr);
2668
2669	SmallVector<QualType, 4> ArgTypes;
2670	ArgTypes.push_back(Elt: Context->getObjCClassType());
2671	ArgTypes.push_back(Elt: Context->getObjCSelType());
2672	for (const auto PI : BoxingMethod->parameters())
2673	ArgTypes.push_back(Elt: PI->getType());
2674
2675	QualType returnType = Exp->getType();
2676	// Get the type, we will need to reference it in a couple spots.
2677	QualType msgSendType = MsgSendFlavor->getType();
2678
2679	// Create a reference to the objc_msgSend() declaration.
2680	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2681	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2682
2683	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2684	Ctx: Context, Ty: Context->getPointerType(Context->VoidTy), Kind: CK_BitCast, E: DRE);
2685
2686	// Now do the "normal" pointer to function cast.
2687	QualType castType =
2688	getSimpleFunctionType(result: returnType, args: ArgTypes, variadic: BoxingMethod->isVariadic());
2689	castType = Context->getPointerType(T: castType);
2690	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2691	cast);
2692
2693	// Don't forget the parens to enforce the proper binding.
2694	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2695
2696	auto *FT = msgSendType->castAs<FunctionType>();
2697	CallExpr *CE = CallExpr::Create(Ctx: *Context, Fn: PE, Args: MsgExprs, Ty: FT->getReturnType(),
2698	VK: VK_PRValue, RParenLoc: EndLoc, FPFeatures: FPOptionsOverride());
2699	ReplaceStmt(Exp, CE);
2700	return CE;
2701	}
2702
2703	Stmt *RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp) {
2704	// synthesize declaration of helper functions needed in this routine.
2705	if (!SelGetUidFunctionDecl)
2706	SynthSelGetUidFunctionDecl();
2707	// use objc_msgSend() for all.
2708	if (!MsgSendFunctionDecl)
2709	SynthMsgSendFunctionDecl();
2710	if (!GetClassFunctionDecl)
2711	SynthGetClassFunctionDecl();
2712
2713	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2714	SourceLocation StartLoc = Exp->getBeginLoc();
2715	SourceLocation EndLoc = Exp->getEndLoc();
2716
2717	// Build the expression: __NSContainer_literal(int, ...).arr
2718	QualType IntQT = Context->IntTy;
2719	QualType NSArrayFType =
2720	getSimpleFunctionType(result: Context->VoidTy, args: IntQT, variadic: true);
2721	std::string NSArrayFName("__NSContainer_literal");
2722	FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(name: NSArrayFName);
2723	DeclRefExpr *NSArrayDRE = new (Context) DeclRefExpr(
2724	*Context, NSArrayFD, false, NSArrayFType, VK_PRValue, SourceLocation());
2725
2726	SmallVector<Expr*, 16> InitExprs;
2727	unsigned NumElements = Exp->getNumElements();
2728	unsigned UnsignedIntSize =
2729	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2730	Expr *count = IntegerLiteral::Create(*Context,
2731	llvm::APInt(UnsignedIntSize, NumElements),
2732	Context->UnsignedIntTy, SourceLocation());
2733	InitExprs.push_back(Elt: count);
2734	for (unsigned i = 0; i < NumElements; i++)
2735	InitExprs.push_back(Elt: Exp->getElement(Index: i));
2736	Expr *NSArrayCallExpr =
2737	CallExpr::Create(*Context, NSArrayDRE, InitExprs, NSArrayFType, VK_LValue,
2738	SourceLocation(), FPOptionsOverride());
2739
2740	FieldDecl *ARRFD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
2741	IdLoc: SourceLocation(),
2742	Id: &Context->Idents.get(Name: "arr"),
2743	T: Context->getPointerType(Context->VoidPtrTy),
2744	TInfo: nullptr, /*BitWidth=*/BW: nullptr,
2745	/*Mutable=*/true, InitStyle: ICIS_NoInit);
2746	MemberExpr *ArrayLiteralME =
2747	MemberExpr::CreateImplicit(C: *Context, Base: NSArrayCallExpr, IsArrow: false, MemberDecl: ARRFD,
2748	T: ARRFD->getType(), VK: VK_LValue, OK: OK_Ordinary);
2749	QualType ConstIdT = Context->getObjCIdType().withConst();
2750	CStyleCastExpr * ArrayLiteralObjects =
2751	NoTypeInfoCStyleCastExpr(Context,
2752	Context->getPointerType(T: ConstIdT),
2753	CK_BitCast,
2754	ArrayLiteralME);
2755
2756	// Synthesize a call to objc_msgSend().
2757	SmallVector<Expr*, 32> MsgExprs;
2758	SmallVector<Expr*, 4> ClsExprs;
2759	QualType expType = Exp->getType();
2760
2761	// Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2762	ObjCInterfaceDecl *Class =
2763	expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2764
2765	IdentifierInfo *clsName = Class->getIdentifier();
2766	ClsExprs.push_back(getStringLiteral(Str: clsName->getName()));
2767	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetClassFunctionDecl, Args: ClsExprs,
2768	StartLoc, EndLoc);
2769	MsgExprs.push_back(Cls);
2770
2771	// Create a call to sel_registerName("arrayWithObjects:count:").
2772	// it will be the 2nd argument.
2773	SmallVector<Expr*, 4> SelExprs;
2774	ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
2775	SelExprs.push_back(
2776	getStringLiteral(Str: ArrayMethod->getSelector().getAsString()));
2777	CallExpr *SelExp = SynthesizeCallToFunctionDecl(FD: SelGetUidFunctionDecl,
2778	Args: SelExprs, StartLoc, EndLoc);
2779	MsgExprs.push_back(SelExp);
2780
2781	// (const id [])objects
2782	MsgExprs.push_back(ArrayLiteralObjects);
2783
2784	// (NSUInteger)cnt
2785	Expr *cnt = IntegerLiteral::Create(*Context,
2786	llvm::APInt(UnsignedIntSize, NumElements),
2787	Context->UnsignedIntTy, SourceLocation());
2788	MsgExprs.push_back(Elt: cnt);
2789
2790	SmallVector<QualType, 4> ArgTypes;
2791	ArgTypes.push_back(Elt: Context->getObjCClassType());
2792	ArgTypes.push_back(Elt: Context->getObjCSelType());
2793	for (const auto *PI : ArrayMethod->parameters())
2794	ArgTypes.push_back(Elt: PI->getType());
2795
2796	QualType returnType = Exp->getType();
2797	// Get the type, we will need to reference it in a couple spots.
2798	QualType msgSendType = MsgSendFlavor->getType();
2799
2800	// Create a reference to the objc_msgSend() declaration.
2801	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2802	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2803
2804	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2805	Ctx: Context, Ty: Context->getPointerType(Context->VoidTy), Kind: CK_BitCast, E: DRE);
2806
2807	// Now do the "normal" pointer to function cast.
2808	QualType castType =
2809	getSimpleFunctionType(result: returnType, args: ArgTypes, variadic: ArrayMethod->isVariadic());
2810	castType = Context->getPointerType(T: castType);
2811	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2812	cast);
2813
2814	// Don't forget the parens to enforce the proper binding.
2815	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2816
2817	const FunctionType *FT = msgSendType->castAs<FunctionType>();
2818	CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2819	VK_PRValue, EndLoc, FPOptionsOverride());
2820	ReplaceStmt(Exp, CE);
2821	return CE;
2822	}
2823
2824	Stmt *RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp) {
2825	// synthesize declaration of helper functions needed in this routine.
2826	if (!SelGetUidFunctionDecl)
2827	SynthSelGetUidFunctionDecl();
2828	// use objc_msgSend() for all.
2829	if (!MsgSendFunctionDecl)
2830	SynthMsgSendFunctionDecl();
2831	if (!GetClassFunctionDecl)
2832	SynthGetClassFunctionDecl();
2833
2834	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2835	SourceLocation StartLoc = Exp->getBeginLoc();
2836	SourceLocation EndLoc = Exp->getEndLoc();
2837
2838	// Build the expression: __NSContainer_literal(int, ...).arr
2839	QualType IntQT = Context->IntTy;
2840	QualType NSDictFType =
2841	getSimpleFunctionType(result: Context->VoidTy, args: IntQT, variadic: true);
2842	std::string NSDictFName("__NSContainer_literal");
2843	FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(name: NSDictFName);
2844	DeclRefExpr *NSDictDRE = new (Context) DeclRefExpr(
2845	*Context, NSDictFD, false, NSDictFType, VK_PRValue, SourceLocation());
2846
2847	SmallVector<Expr*, 16> KeyExprs;
2848	SmallVector<Expr*, 16> ValueExprs;
2849
2850	unsigned NumElements = Exp->getNumElements();
2851	unsigned UnsignedIntSize =
2852	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2853	Expr *count = IntegerLiteral::Create(*Context,
2854	llvm::APInt(UnsignedIntSize, NumElements),
2855	Context->UnsignedIntTy, SourceLocation());
2856	KeyExprs.push_back(Elt: count);
2857	ValueExprs.push_back(Elt: count);
2858	for (unsigned i = 0; i < NumElements; i++) {
2859	ObjCDictionaryElement Element = Exp->getKeyValueElement(Index: i);
2860	KeyExprs.push_back(Elt: Element.Key);
2861	ValueExprs.push_back(Elt: Element.Value);
2862	}
2863
2864	// (const id [])objects
2865	Expr *NSValueCallExpr =
2866	CallExpr::Create(*Context, NSDictDRE, ValueExprs, NSDictFType, VK_LValue,
2867	SourceLocation(), FPOptionsOverride());
2868
2869	FieldDecl *ARRFD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
2870	IdLoc: SourceLocation(),
2871	Id: &Context->Idents.get(Name: "arr"),
2872	T: Context->getPointerType(Context->VoidPtrTy),
2873	TInfo: nullptr, /*BitWidth=*/BW: nullptr,
2874	/*Mutable=*/true, InitStyle: ICIS_NoInit);
2875	MemberExpr *DictLiteralValueME =
2876	MemberExpr::CreateImplicit(C: *Context, Base: NSValueCallExpr, IsArrow: false, MemberDecl: ARRFD,
2877	T: ARRFD->getType(), VK: VK_LValue, OK: OK_Ordinary);
2878	QualType ConstIdT = Context->getObjCIdType().withConst();
2879	CStyleCastExpr * DictValueObjects =
2880	NoTypeInfoCStyleCastExpr(Context,
2881	Context->getPointerType(T: ConstIdT),
2882	CK_BitCast,
2883	DictLiteralValueME);
2884	// (const id <NSCopying> [])keys
2885	Expr *NSKeyCallExpr =
2886	CallExpr::Create(*Context, NSDictDRE, KeyExprs, NSDictFType, VK_LValue,
2887	SourceLocation(), FPOptionsOverride());
2888
2889	MemberExpr *DictLiteralKeyME =
2890	MemberExpr::CreateImplicit(C: *Context, Base: NSKeyCallExpr, IsArrow: false, MemberDecl: ARRFD,
2891	T: ARRFD->getType(), VK: VK_LValue, OK: OK_Ordinary);
2892
2893	CStyleCastExpr * DictKeyObjects =
2894	NoTypeInfoCStyleCastExpr(Context,
2895	Context->getPointerType(T: ConstIdT),
2896	CK_BitCast,
2897	DictLiteralKeyME);
2898
2899	// Synthesize a call to objc_msgSend().
2900	SmallVector<Expr*, 32> MsgExprs;
2901	SmallVector<Expr*, 4> ClsExprs;
2902	QualType expType = Exp->getType();
2903
2904	// Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2905	ObjCInterfaceDecl *Class =
2906	expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2907
2908	IdentifierInfo *clsName = Class->getIdentifier();
2909	ClsExprs.push_back(getStringLiteral(Str: clsName->getName()));
2910	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetClassFunctionDecl, Args: ClsExprs,
2911	StartLoc, EndLoc);
2912	MsgExprs.push_back(Cls);
2913
2914	// Create a call to sel_registerName("arrayWithObjects:count:").
2915	// it will be the 2nd argument.
2916	SmallVector<Expr*, 4> SelExprs;
2917	ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
2918	SelExprs.push_back(getStringLiteral(Str: DictMethod->getSelector().getAsString()));
2919	CallExpr *SelExp = SynthesizeCallToFunctionDecl(FD: SelGetUidFunctionDecl,
2920	Args: SelExprs, StartLoc, EndLoc);
2921	MsgExprs.push_back(SelExp);
2922
2923	// (const id [])objects
2924	MsgExprs.push_back(DictValueObjects);
2925
2926	// (const id <NSCopying> [])keys
2927	MsgExprs.push_back(DictKeyObjects);
2928
2929	// (NSUInteger)cnt
2930	Expr *cnt = IntegerLiteral::Create(*Context,
2931	llvm::APInt(UnsignedIntSize, NumElements),
2932	Context->UnsignedIntTy, SourceLocation());
2933	MsgExprs.push_back(Elt: cnt);
2934
2935	SmallVector<QualType, 8> ArgTypes;
2936	ArgTypes.push_back(Elt: Context->getObjCClassType());
2937	ArgTypes.push_back(Elt: Context->getObjCSelType());
2938	for (const auto *PI : DictMethod->parameters()) {
2939	QualType T = PI->getType();
2940	if (const PointerType* PT = T->getAs<PointerType>()) {
2941	QualType PointeeTy = PT->getPointeeType();
2942	convertToUnqualifiedObjCType(T&: PointeeTy);
2943	T = Context->getPointerType(T: PointeeTy);
2944	}
2945	ArgTypes.push_back(Elt: T);
2946	}
2947
2948	QualType returnType = Exp->getType();
2949	// Get the type, we will need to reference it in a couple spots.
2950	QualType msgSendType = MsgSendFlavor->getType();
2951
2952	// Create a reference to the objc_msgSend() declaration.
2953	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2954	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2955
2956	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2957	Ctx: Context, Ty: Context->getPointerType(Context->VoidTy), Kind: CK_BitCast, E: DRE);
2958
2959	// Now do the "normal" pointer to function cast.
2960	QualType castType =
2961	getSimpleFunctionType(result: returnType, args: ArgTypes, variadic: DictMethod->isVariadic());
2962	castType = Context->getPointerType(T: castType);
2963	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2964	cast);
2965
2966	// Don't forget the parens to enforce the proper binding.
2967	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2968
2969	const FunctionType *FT = msgSendType->castAs<FunctionType>();
2970	CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2971	VK_PRValue, EndLoc, FPOptionsOverride());
2972	ReplaceStmt(Exp, CE);
2973	return CE;
2974	}
2975
2976	// struct __rw_objc_super {
2977	// struct objc_object *object; struct objc_object *superClass;
2978	// };
2979	QualType RewriteModernObjC::getSuperStructType() {
2980	if (!SuperStructDecl) {
2981	SuperStructDecl = RecordDecl::Create(
2982	*Context, TagTypeKind::Struct, TUDecl, SourceLocation(),
2983	SourceLocation(), &Context->Idents.get(Name: "__rw_objc_super"));
2984	QualType FieldTypes[2];
2985
2986	// struct objc_object *object;
2987	FieldTypes[0] = Context->getObjCIdType();
2988	// struct objc_object *superClass;
2989	FieldTypes[1] = Context->getObjCIdType();
2990
2991	// Create fields
2992	for (unsigned i = 0; i < 2; ++i) {
2993	SuperStructDecl->addDecl(D: FieldDecl::Create(*Context, SuperStructDecl,
2994	SourceLocation(),
2995	SourceLocation(), nullptr,
2996	FieldTypes[i], nullptr,
2997	/*BitWidth=*/nullptr,
2998	/*Mutable=*/false,
2999	ICIS_NoInit));
3000	}
3001
3002	SuperStructDecl->completeDefinition();
3003	}
3004	return Context->getTagDeclType(SuperStructDecl);
3005	}
3006
3007	QualType RewriteModernObjC::getConstantStringStructType() {
3008	if (!ConstantStringDecl) {
3009	ConstantStringDecl = RecordDecl::Create(
3010	*Context, TagTypeKind::Struct, TUDecl, SourceLocation(),
3011	SourceLocation(), &Context->Idents.get(Name: "__NSConstantStringImpl"));
3012	QualType FieldTypes[4];
3013
3014	// struct objc_object *receiver;
3015	FieldTypes[0] = Context->getObjCIdType();
3016	// int flags;
3017	FieldTypes[1] = Context->IntTy;
3018	// char *str;
3019	FieldTypes[2] = Context->getPointerType(Context->CharTy);
3020	// long length;
3021	FieldTypes[3] = Context->LongTy;
3022
3023	// Create fields
3024	for (unsigned i = 0; i < 4; ++i) {
3025	ConstantStringDecl->addDecl(D: FieldDecl::Create(*Context,
3026	ConstantStringDecl,
3027	SourceLocation(),
3028	SourceLocation(), nullptr,
3029	FieldTypes[i], nullptr,
3030	/*BitWidth=*/nullptr,
3031	/*Mutable=*/true,
3032	ICIS_NoInit));
3033	}
3034
3035	ConstantStringDecl->completeDefinition();
3036	}
3037	return Context->getTagDeclType(ConstantStringDecl);
3038	}
3039
3040	/// getFunctionSourceLocation - returns start location of a function
3041	/// definition. Complication arises when function has declared as
3042	/// extern "C" or extern "C" {...}
3043	static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
3044	FunctionDecl *FD) {
3045	if (FD->isExternC() && !FD->isMain()) {
3046	const DeclContext *DC = FD->getDeclContext();
3047	if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(Val: DC))
3048	// if it is extern "C" {...}, return function decl's own location.
3049	if (!LSD->getRBraceLoc().isValid())
3050	return LSD->getExternLoc();
3051	}
3052	if (FD->getStorageClass() != SC_None)
3053	R.RewriteBlockLiteralFunctionDecl(FD);
3054	return FD->getTypeSpecStartLoc();
3055	}
3056
3057	void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
3058
3059	SourceLocation Location = D->getLocation();
3060
3061	if (Location.isFileID() && GenerateLineInfo) {
3062	std::string LineString("\n#line ");
3063	PresumedLoc PLoc = SM->getPresumedLoc(Loc: Location);
3064	LineString += utostr(X: PLoc.getLine());
3065	LineString += " \"";
3066	LineString += Lexer::Stringify(Str: PLoc.getFilename());
3067	if (isa<ObjCMethodDecl>(Val: D))
3068	LineString += "\"";
3069	else LineString += "\"\n";
3070
3071	Location = D->getBeginLoc();
3072	if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: D)) {
3073	if (FD->isExternC() && !FD->isMain()) {
3074	const DeclContext *DC = FD->getDeclContext();
3075	if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(Val: DC))
3076	// if it is extern "C" {...}, return function decl's own location.
3077	if (!LSD->getRBraceLoc().isValid())
3078	Location = LSD->getExternLoc();
3079	}
3080	}
3081	InsertText(Loc: Location, Str: LineString);
3082	}
3083	}
3084
3085	/// SynthMsgSendStretCallExpr - This routine translates message expression
3086	/// into a call to objc_msgSend_stret() entry point. Tricky part is that
3087	/// nil check on receiver must be performed before calling objc_msgSend_stret.
3088	/// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
3089	/// msgSendType - function type of objc_msgSend_stret(...)
3090	/// returnType - Result type of the method being synthesized.
3091	/// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
3092	/// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
3093	/// starting with receiver.
3094	/// Method - Method being rewritten.
3095	Expr *RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
3096	QualType returnType,
3097	SmallVectorImpl<QualType> &ArgTypes,
3098	SmallVectorImpl<Expr*> &MsgExprs,
3099	ObjCMethodDecl *Method) {
3100	// Now do the "normal" pointer to function cast.
3101	QualType FuncType = getSimpleFunctionType(
3102	result: returnType, args: ArgTypes, variadic: Method ? Method->isVariadic() : false);
3103	QualType castType = Context->getPointerType(T: FuncType);
3104
3105	// build type for containing the objc_msgSend_stret object.
3106	static unsigned stretCount=0;
3107	std::string name = "__Stret"; name += utostr(X: stretCount);
3108	std::string str =
3109	"extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
3110	str += "namespace {\n";
3111	str += "struct "; str += name;
3112	str += " {\n\t";
3113	str += name;
3114	str += "(id receiver, SEL sel";
3115	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3116	std::string ArgName = "arg"; ArgName += utostr(X: i);
3117	ArgTypes[i].getAsStringInternal(Str&: ArgName, Policy: Context->getPrintingPolicy());
3118	str += ", "; str += ArgName;
3119	}
3120	// could be vararg.
3121	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3122	std::string ArgName = "arg"; ArgName += utostr(X: i);
3123	MsgExprs[i]->getType().getAsStringInternal(Str&: ArgName,
3124	Policy: Context->getPrintingPolicy());
3125	str += ", "; str += ArgName;
3126	}
3127
3128	str += ") {\n";
3129	str += "\t unsigned size = sizeof(";
3130	str += returnType.getAsString(Policy: Context->getPrintingPolicy()); str += ");\n";
3131
3132	str += "\t if (size == 1 || size == 2 || size == 4 || size == 8)\n";
3133
3134	str += "\t s = (("; str += castType.getAsString(Policy: Context->getPrintingPolicy());
3135	str += ")(void *)objc_msgSend)(receiver, sel";
3136	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3137	str += ", arg"; str += utostr(X: i);
3138	}
3139	// could be vararg.
3140	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3141	str += ", arg"; str += utostr(X: i);
3142	}
3143	str+= ");\n";
3144
3145	str += "\t else if (receiver == 0)\n";
3146	str += "\t memset((void*)&s, 0, sizeof(s));\n";
3147	str += "\t else\n";
3148
3149	str += "\t s = (("; str += castType.getAsString(Policy: Context->getPrintingPolicy());
3150	str += ")(void *)objc_msgSend_stret)(receiver, sel";
3151	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3152	str += ", arg"; str += utostr(X: i);
3153	}
3154	// could be vararg.
3155	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3156	str += ", arg"; str += utostr(X: i);
3157	}
3158	str += ");\n";
3159
3160	str += "\t}\n";
3161	str += "\t"; str += returnType.getAsString(Policy: Context->getPrintingPolicy());
3162	str += " s;\n";
3163	str += "};\n};\n\n";
3164	SourceLocation FunLocStart;
3165	if (CurFunctionDef)
3166	FunLocStart = getFunctionSourceLocation(R&: *this, FD: CurFunctionDef);
3167	else {
3168	assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null");
3169	FunLocStart = CurMethodDef->getBeginLoc();
3170	}
3171
3172	InsertText(Loc: FunLocStart, Str: str);
3173	++stretCount;
3174
3175	// AST for __Stretn(receiver, args).s;
3176	IdentifierInfo *ID = &Context->Idents.get(Name: name);
3177	FunctionDecl *FD =
3178	FunctionDecl::Create(*Context, TUDecl, SourceLocation(), SourceLocation(),
3179	ID, FuncType, nullptr, SC_Extern, false, false);
3180	DeclRefExpr *DRE = new (Context)
3181	DeclRefExpr(*Context, FD, false, castType, VK_PRValue, SourceLocation());
3182	CallExpr *STCE =
3183	CallExpr::Create(*Context, DRE, MsgExprs, castType, VK_LValue,
3184	SourceLocation(), FPOptionsOverride());
3185
3186	FieldDecl *FieldD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
3187	IdLoc: SourceLocation(),
3188	Id: &Context->Idents.get(Name: "s"),
3189	T: returnType, TInfo: nullptr,
3190	/*BitWidth=*/BW: nullptr,
3191	/*Mutable=*/true, InitStyle: ICIS_NoInit);
3192	MemberExpr *ME = MemberExpr::CreateImplicit(
3193	C: *Context, Base: STCE, IsArrow: false, MemberDecl: FieldD, T: FieldD->getType(), VK: VK_LValue, OK: OK_Ordinary);
3194
3195	return ME;
3196	}
3197
3198	Stmt *RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
3199	SourceLocation StartLoc,
3200	SourceLocation EndLoc) {
3201	if (!SelGetUidFunctionDecl)
3202	SynthSelGetUidFunctionDecl();
3203	if (!MsgSendFunctionDecl)
3204	SynthMsgSendFunctionDecl();
3205	if (!MsgSendSuperFunctionDecl)
3206	SynthMsgSendSuperFunctionDecl();
3207	if (!MsgSendStretFunctionDecl)
3208	SynthMsgSendStretFunctionDecl();
3209	if (!MsgSendSuperStretFunctionDecl)
3210	SynthMsgSendSuperStretFunctionDecl();
3211	if (!MsgSendFpretFunctionDecl)
3212	SynthMsgSendFpretFunctionDecl();
3213	if (!GetClassFunctionDecl)
3214	SynthGetClassFunctionDecl();
3215	if (!GetSuperClassFunctionDecl)
3216	SynthGetSuperClassFunctionDecl();
3217	if (!GetMetaClassFunctionDecl)
3218	SynthGetMetaClassFunctionDecl();
3219
3220	// default to objc_msgSend().
3221	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
3222	// May need to use objc_msgSend_stret() as well.
3223	FunctionDecl *MsgSendStretFlavor = nullptr;
3224	if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
3225	QualType resultType = mDecl->getReturnType();
3226	if (resultType->isRecordType())
3227	MsgSendStretFlavor = MsgSendStretFunctionDecl;
3228	else if (resultType->isRealFloatingType())
3229	MsgSendFlavor = MsgSendFpretFunctionDecl;
3230	}
3231
3232	// Synthesize a call to objc_msgSend().
3233	SmallVector<Expr*, 8> MsgExprs;
3234	switch (Exp->getReceiverKind()) {
3235	case ObjCMessageExpr::SuperClass: {
3236	MsgSendFlavor = MsgSendSuperFunctionDecl;
3237	if (MsgSendStretFlavor)
3238	MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3239	assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3240
3241	ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3242
3243	SmallVector<Expr*, 4> InitExprs;
3244
3245	// set the receiver to self, the first argument to all methods.
3246	InitExprs.push_back(NoTypeInfoCStyleCastExpr(
3247	Context, Context->getObjCIdType(), CK_BitCast,
3248	new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
3249	Context->getObjCIdType(), VK_PRValue,
3250	SourceLocation()))); // set the 'receiver'.
3251
3252	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3253	SmallVector<Expr*, 8> ClsExprs;
3254	ClsExprs.push_back(Elt: getStringLiteral(Str: ClassDecl->getIdentifier()->getName()));
3255	// (Class)objc_getClass("CurrentClass")
3256	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetMetaClassFunctionDecl,
3257	Args: ClsExprs, StartLoc, EndLoc);
3258	ClsExprs.clear();
3259	ClsExprs.push_back(Cls);
3260	Cls = SynthesizeCallToFunctionDecl(FD: GetSuperClassFunctionDecl, Args: ClsExprs,
3261	StartLoc, EndLoc);
3262
3263	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3264	// To turn off a warning, type-cast to 'id'
3265	InitExprs.push_back( // set 'super class', using class_getSuperclass().
3266	NoTypeInfoCStyleCastExpr(Context,
3267	Context->getObjCIdType(),
3268	CK_BitCast, Cls));
3269	// struct __rw_objc_super
3270	QualType superType = getSuperStructType();
3271	Expr *SuperRep;
3272
3273	if (LangOpts.MicrosoftExt) {
3274	SynthSuperConstructorFunctionDecl();
3275	// Simulate a constructor call...
3276	DeclRefExpr *DRE = new (Context)
3277	DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3278	VK_LValue, SourceLocation());
3279	SuperRep =
3280	CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3281	SourceLocation(), FPOptionsOverride());
3282	// The code for super is a little tricky to prevent collision with
3283	// the structure definition in the header. The rewriter has it's own
3284	// internal definition (__rw_objc_super) that is uses. This is why
3285	// we need the cast below. For example:
3286	// (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3287	//
3288	SuperRep = UnaryOperator::Create(
3289	C: const_cast<ASTContext &>(*Context), input: SuperRep, opc: UO_AddrOf,
3290	type: Context->getPointerType(T: SuperRep->getType()), VK: VK_PRValue, OK: OK_Ordinary,
3291	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
3292	SuperRep = NoTypeInfoCStyleCastExpr(Ctx: Context,
3293	Ty: Context->getPointerType(T: superType),
3294	Kind: CK_BitCast, E: SuperRep);
3295	} else {
3296	// (struct __rw_objc_super) { <exprs from above> }
3297	InitListExpr *ILE =
3298	new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3299	SourceLocation());
3300	TypeSourceInfo *superTInfo
3301	= Context->getTrivialTypeSourceInfo(T: superType);
3302	SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3303	superType, VK_LValue,
3304	ILE, false);
3305	// struct __rw_objc_super *
3306	SuperRep = UnaryOperator::Create(
3307	C: const_cast<ASTContext &>(*Context), input: SuperRep, opc: UO_AddrOf,
3308	type: Context->getPointerType(T: SuperRep->getType()), VK: VK_PRValue, OK: OK_Ordinary,
3309	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
3310	}
3311	MsgExprs.push_back(Elt: SuperRep);
3312	break;
3313	}
3314
3315	case ObjCMessageExpr::Class: {
3316	SmallVector<Expr*, 8> ClsExprs;
3317	ObjCInterfaceDecl *Class
3318	= Exp->getClassReceiver()->castAs<ObjCObjectType>()->getInterface();
3319	IdentifierInfo *clsName = Class->getIdentifier();
3320	ClsExprs.push_back(getStringLiteral(Str: clsName->getName()));
3321	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetClassFunctionDecl, Args: ClsExprs,
3322	StartLoc, EndLoc);
3323	CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
3324	Context->getObjCIdType(),
3325	CK_BitCast, Cls);
3326	MsgExprs.push_back(ArgExpr);
3327	break;
3328	}
3329
3330	case ObjCMessageExpr::SuperInstance:{
3331	MsgSendFlavor = MsgSendSuperFunctionDecl;
3332	if (MsgSendStretFlavor)
3333	MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3334	assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3335	ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3336	SmallVector<Expr*, 4> InitExprs;
3337
3338	InitExprs.push_back(NoTypeInfoCStyleCastExpr(
3339	Context, Context->getObjCIdType(), CK_BitCast,
3340	new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
3341	Context->getObjCIdType(), VK_PRValue,
3342	SourceLocation()))); // set the 'receiver'.
3343
3344	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3345	SmallVector<Expr*, 8> ClsExprs;
3346	ClsExprs.push_back(Elt: getStringLiteral(Str: ClassDecl->getIdentifier()->getName()));
3347	// (Class)objc_getClass("CurrentClass")
3348	CallExpr *Cls = SynthesizeCallToFunctionDecl(FD: GetClassFunctionDecl, Args: ClsExprs,
3349	StartLoc, EndLoc);
3350	ClsExprs.clear();
3351	ClsExprs.push_back(Cls);
3352	Cls = SynthesizeCallToFunctionDecl(FD: GetSuperClassFunctionDecl, Args: ClsExprs,
3353	StartLoc, EndLoc);
3354
3355	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3356	// To turn off a warning, type-cast to 'id'
3357	InitExprs.push_back(
3358	// set 'super class', using class_getSuperclass().
3359	NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3360	CK_BitCast, Cls));
3361	// struct __rw_objc_super
3362	QualType superType = getSuperStructType();
3363	Expr *SuperRep;
3364
3365	if (LangOpts.MicrosoftExt) {
3366	SynthSuperConstructorFunctionDecl();
3367	// Simulate a constructor call...
3368	DeclRefExpr *DRE = new (Context)
3369	DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3370	VK_LValue, SourceLocation());
3371	SuperRep =
3372	CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3373	SourceLocation(), FPOptionsOverride());
3374	// The code for super is a little tricky to prevent collision with
3375	// the structure definition in the header. The rewriter has it's own
3376	// internal definition (__rw_objc_super) that is uses. This is why
3377	// we need the cast below. For example:
3378	// (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3379	//
3380	SuperRep = UnaryOperator::Create(
3381	C: const_cast<ASTContext &>(*Context), input: SuperRep, opc: UO_AddrOf,
3382	type: Context->getPointerType(T: SuperRep->getType()), VK: VK_PRValue, OK: OK_Ordinary,
3383	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
3384	SuperRep = NoTypeInfoCStyleCastExpr(Ctx: Context,
3385	Ty: Context->getPointerType(T: superType),
3386	Kind: CK_BitCast, E: SuperRep);
3387	} else {
3388	// (struct __rw_objc_super) { <exprs from above> }
3389	InitListExpr *ILE =
3390	new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3391	SourceLocation());
3392	TypeSourceInfo *superTInfo
3393	= Context->getTrivialTypeSourceInfo(T: superType);
3394	SuperRep = new (Context) CompoundLiteralExpr(
3395	SourceLocation(), superTInfo, superType, VK_PRValue, ILE, false);
3396	}
3397	MsgExprs.push_back(Elt: SuperRep);
3398	break;
3399	}
3400
3401	case ObjCMessageExpr::Instance: {
3402	// Remove all type-casts because it may contain objc-style types; e.g.
3403	// Foo<Proto> *.
3404	Expr *recExpr = Exp->getInstanceReceiver();
3405	while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: recExpr))
3406	recExpr = CE->getSubExpr();
3407	CastKind CK = recExpr->getType()->isObjCObjectPointerType()
3408	? CK_BitCast : recExpr->getType()->isBlockPointerType()
3409	? CK_BlockPointerToObjCPointerCast
3410	: CK_CPointerToObjCPointerCast;
3411
3412	recExpr = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Context->getObjCIdType(),
3413	Kind: CK, E: recExpr);
3414	MsgExprs.push_back(Elt: recExpr);
3415	break;
3416	}
3417	}
3418
3419	// Create a call to sel_registerName("selName"), it will be the 2nd argument.
3420	SmallVector<Expr*, 8> SelExprs;
3421	SelExprs.push_back(getStringLiteral(Str: Exp->getSelector().getAsString()));
3422	CallExpr *SelExp = SynthesizeCallToFunctionDecl(FD: SelGetUidFunctionDecl,
3423	Args: SelExprs, StartLoc, EndLoc);
3424	MsgExprs.push_back(SelExp);
3425
3426	// Now push any user supplied arguments.
3427	for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
3428	Expr *userExpr = Exp->getArg(Arg: i);
3429	// Make all implicit casts explicit...ICE comes in handy:-)
3430	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: userExpr)) {
3431	// Reuse the ICE type, it is exactly what the doctor ordered.
3432	QualType type = ICE->getType();
3433	if (needToScanForQualifiers(T: type))
3434	type = Context->getObjCIdType();
3435	// Make sure we convert "type (^)(...)" to "type (*)(...)".
3436	(void)convertBlockPointerToFunctionPointer(T&: type);
3437	const Expr *SubExpr = ICE->IgnoreParenImpCasts();
3438	CastKind CK;
3439	if (SubExpr->getType()->isIntegralType(Ctx: *Context) &&
3440	type->isBooleanType()) {
3441	CK = CK_IntegralToBoolean;
3442	} else if (type->isObjCObjectPointerType()) {
3443	if (SubExpr->getType()->isBlockPointerType()) {
3444	CK = CK_BlockPointerToObjCPointerCast;
3445	} else if (SubExpr->getType()->isPointerType()) {
3446	CK = CK_CPointerToObjCPointerCast;
3447	} else {
3448	CK = CK_BitCast;
3449	}
3450	} else {
3451	CK = CK_BitCast;
3452	}
3453
3454	userExpr = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: type, Kind: CK, E: userExpr);
3455	}
3456	// Make id<P...> cast into an 'id' cast.
3457	else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: userExpr)) {
3458	if (CE->getType()->isObjCQualifiedIdType()) {
3459	while ((CE = dyn_cast<CStyleCastExpr>(Val: userExpr)))
3460	userExpr = CE->getSubExpr();
3461	CastKind CK;
3462	if (userExpr->getType()->isIntegralType(Ctx: *Context)) {
3463	CK = CK_IntegralToPointer;
3464	} else if (userExpr->getType()->isBlockPointerType()) {
3465	CK = CK_BlockPointerToObjCPointerCast;
3466	} else if (userExpr->getType()->isPointerType()) {
3467	CK = CK_CPointerToObjCPointerCast;
3468	} else {
3469	CK = CK_BitCast;
3470	}
3471	userExpr = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Context->getObjCIdType(),
3472	Kind: CK, E: userExpr);
3473	}
3474	}
3475	MsgExprs.push_back(Elt: userExpr);
3476	// We've transferred the ownership to MsgExprs. For now, we *don't* null
3477	// out the argument in the original expression (since we aren't deleting
3478	// the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
3479	//Exp->setArg(i, 0);
3480	}
3481	// Generate the funky cast.
3482	CastExpr *cast;
3483	SmallVector<QualType, 8> ArgTypes;
3484	QualType returnType;
3485
3486	// Push 'id' and 'SEL', the 2 implicit arguments.
3487	if (MsgSendFlavor == MsgSendSuperFunctionDecl)
3488	ArgTypes.push_back(Elt: Context->getPointerType(T: getSuperStructType()));
3489	else
3490	ArgTypes.push_back(Elt: Context->getObjCIdType());
3491	ArgTypes.push_back(Elt: Context->getObjCSelType());
3492	if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
3493	// Push any user argument types.
3494	for (const auto *PI : OMD->parameters()) {
3495	QualType t = PI->getType()->isObjCQualifiedIdType()
3496	? Context->getObjCIdType()
3497	: PI->getType();
3498	// Make sure we convert "t (^)(...)" to "t (*)(...)".
3499	(void)convertBlockPointerToFunctionPointer(T&: t);
3500	ArgTypes.push_back(Elt: t);
3501	}
3502	returnType = Exp->getType();
3503	convertToUnqualifiedObjCType(T&: returnType);
3504	(void)convertBlockPointerToFunctionPointer(T&: returnType);
3505	} else {
3506	returnType = Context->getObjCIdType();
3507	}
3508	// Get the type, we will need to reference it in a couple spots.
3509	QualType msgSendType = MsgSendFlavor->getType();
3510
3511	// Create a reference to the objc_msgSend() declaration.
3512	DeclRefExpr *DRE = new (Context) DeclRefExpr(
3513	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
3514
3515	// Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
3516	// If we don't do this cast, we get the following bizarre warning/note:
3517	// xx.m:13: warning: function called through a non-compatible type
3518	// xx.m:13: note: if this code is reached, the program will abort
3519	cast = NoTypeInfoCStyleCastExpr(Ctx: Context,
3520	Ty: Context->getPointerType(Context->VoidTy),
3521	Kind: CK_BitCast, E: DRE);
3522
3523	// Now do the "normal" pointer to function cast.
3524	// If we don't have a method decl, force a variadic cast.
3525	const ObjCMethodDecl *MD = Exp->getMethodDecl();
3526	QualType castType =
3527	getSimpleFunctionType(result: returnType, args: ArgTypes, variadic: MD ? MD->isVariadic() : true);
3528	castType = Context->getPointerType(T: castType);
3529	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
3530	cast);
3531
3532	// Don't forget the parens to enforce the proper binding.
3533	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
3534
3535	const FunctionType *FT = msgSendType->castAs<FunctionType>();
3536	CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
3537	VK_PRValue, EndLoc, FPOptionsOverride());
3538	Stmt *ReplacingStmt = CE;
3539	if (MsgSendStretFlavor) {
3540	// We have the method which returns a struct/union. Must also generate
3541	// call to objc_msgSend_stret and hang both varieties on a conditional
3542	// expression which dictate which one to envoke depending on size of
3543	// method's return type.
3544
3545	Expr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
3546	returnType,
3547	ArgTypes, MsgExprs,
3548	Method: Exp->getMethodDecl());
3549	ReplacingStmt = STCE;
3550	}
3551	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3552	return ReplacingStmt;
3553	}
3554
3555	Stmt *RewriteModernObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
3556	Stmt *ReplacingStmt =
3557	SynthMessageExpr(Exp, StartLoc: Exp->getBeginLoc(), EndLoc: Exp->getEndLoc());
3558
3559	// Now do the actual rewrite.
3560	ReplaceStmt(Exp, ReplacingStmt);
3561
3562	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3563	return ReplacingStmt;
3564	}
3565
3566	// typedef struct objc_object Protocol;
3567	QualType RewriteModernObjC::getProtocolType() {
3568	if (!ProtocolTypeDecl) {
3569	TypeSourceInfo *TInfo
3570	= Context->getTrivialTypeSourceInfo(T: Context->getObjCIdType());
3571	ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
3572	SourceLocation(), SourceLocation(),
3573	&Context->Idents.get(Name: "Protocol"),
3574	TInfo);
3575	}
3576	return Context->getTypeDeclType(Decl: ProtocolTypeDecl);
3577	}
3578
3579	/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
3580	/// a synthesized/forward data reference (to the protocol's metadata).
3581	/// The forward references (and metadata) are generated in
3582	/// RewriteModernObjC::HandleTranslationUnit().
3583	Stmt *RewriteModernObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
3584	std::string Name = "_OBJC_PROTOCOL_REFERENCE_$_" +
3585	Exp->getProtocol()->getNameAsString();
3586	IdentifierInfo *ID = &Context->Idents.get(Name);
3587	VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
3588	SourceLocation(), ID, getProtocolType(),
3589	nullptr, SC_Extern);
3590	DeclRefExpr *DRE = new (Context) DeclRefExpr(
3591	*Context, VD, false, getProtocolType(), VK_LValue, SourceLocation());
3592	CastExpr *castExpr = NoTypeInfoCStyleCastExpr(
3593	Ctx: Context, Ty: Context->getPointerType(DRE->getType()), Kind: CK_BitCast, E: DRE);
3594	ReplaceStmt(Exp, castExpr);
3595	ProtocolExprDecls.insert(Ptr: Exp->getProtocol()->getCanonicalDecl());
3596	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3597	return castExpr;
3598	}
3599
3600	/// IsTagDefinedInsideClass - This routine checks that a named tagged type
3601	/// is defined inside an objective-c class. If so, it returns true.
3602	bool RewriteModernObjC::IsTagDefinedInsideClass(ObjCContainerDecl *IDecl,
3603	TagDecl *Tag,
3604	bool &IsNamedDefinition) {
3605	if (!IDecl)
3606	return false;
3607	SourceLocation TagLocation;
3608	if (RecordDecl *RD = dyn_cast<RecordDecl>(Val: Tag)) {
3609	RD = RD->getDefinition();
3610	if (!RD || !RD->getDeclName().getAsIdentifierInfo())
3611	return false;
3612	IsNamedDefinition = true;
3613	TagLocation = RD->getLocation();
3614	return Context->getSourceManager().isBeforeInTranslationUnit(
3615	LHS: IDecl->getLocation(), RHS: TagLocation);
3616	}
3617	if (EnumDecl *ED = dyn_cast<EnumDecl>(Val: Tag)) {
3618	if (!ED || !ED->getDeclName().getAsIdentifierInfo())
3619	return false;
3620	IsNamedDefinition = true;
3621	TagLocation = ED->getLocation();
3622	return Context->getSourceManager().isBeforeInTranslationUnit(
3623	LHS: IDecl->getLocation(), RHS: TagLocation);
3624	}
3625	return false;
3626	}
3627
3628	/// RewriteObjCFieldDeclType - This routine rewrites a type into the buffer.
3629	/// It handles elaborated types, as well as enum types in the process.
3630	bool RewriteModernObjC::RewriteObjCFieldDeclType(QualType &Type,
3631	std::string &Result) {
3632	if (Type->getAs<TypedefType>()) {
3633	Result += "\t";
3634	return false;
3635	}
3636
3637	if (Type->isArrayType()) {
3638	QualType ElemTy = Context->getBaseElementType(QT: Type);
3639	return RewriteObjCFieldDeclType(Type&: ElemTy, Result);
3640	}
3641	else if (Type->isRecordType()) {
3642	RecordDecl *RD = Type->castAs<RecordType>()->getDecl();
3643	if (RD->isCompleteDefinition()) {
3644	if (RD->isStruct())
3645	Result += "\n\tstruct ";
3646	else if (RD->isUnion())
3647	Result += "\n\tunion ";
3648	else
3649	assert(false && "class not allowed as an ivar type");
3650
3651	Result += RD->getName();
3652	if (GlobalDefinedTags.count(RD)) {
3653	// struct/union is defined globally, use it.
3654	Result += " ";
3655	return true;
3656	}
3657	Result += " {\n";
3658	for (auto *FD : RD->fields())
3659	RewriteObjCFieldDecl(fieldDecl: FD, Result);
3660	Result += "\t} ";
3661	return true;
3662	}
3663	}
3664	else if (Type->isEnumeralType()) {
3665	EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
3666	if (ED->isCompleteDefinition()) {
3667	Result += "\n\tenum ";
3668	Result += ED->getName();
3669	if (GlobalDefinedTags.count(ED)) {
3670	// Enum is globall defined, use it.
3671	Result += " ";
3672	return true;
3673	}
3674
3675	Result += " {\n";
3676	for (const auto *EC : ED->enumerators()) {
3677	Result += "\t"; Result += EC->getName(); Result += " = ";
3678	Result += toString(I: EC->getInitVal(), Radix: 10);
3679	Result += ",\n";
3680	}
3681	Result += "\t} ";
3682	return true;
3683	}
3684	}
3685
3686	Result += "\t";
3687	convertObjCTypeToCStyleType(T&: Type);
3688	return false;
3689	}
3690
3691
3692	/// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
3693	/// It handles elaborated types, as well as enum types in the process.
3694	void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
3695	std::string &Result) {
3696	QualType Type = fieldDecl->getType();
3697	std::string Name = fieldDecl->getNameAsString();
3698
3699	bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
3700	if (!EleboratedType)
3701	Type.getAsStringInternal(Str&: Name, Policy: Context->getPrintingPolicy());
3702	Result += Name;
3703	if (fieldDecl->isBitField()) {
3704	Result += " : "; Result += utostr(X: fieldDecl->getBitWidthValue(Ctx: *Context));
3705	}
3706	else if (EleboratedType && Type->isArrayType()) {
3707	const ArrayType *AT = Context->getAsArrayType(T: Type);
3708	do {
3709	if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Val: AT)) {
3710	Result += "[";
3711	llvm::APInt Dim = CAT->getSize();
3712	Result += utostr(X: Dim.getZExtValue());
3713	Result += "]";
3714	}
3715	AT = Context->getAsArrayType(T: AT->getElementType());
3716	} while (AT);
3717	}
3718
3719	Result += ";\n";
3720	}
3721
3722	/// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
3723	/// named aggregate types into the input buffer.
3724	void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
3725	std::string &Result) {
3726	QualType Type = fieldDecl->getType();
3727	if (Type->getAs<TypedefType>())
3728	return;
3729	if (Type->isArrayType())
3730	Type = Context->getBaseElementType(QT: Type);
3731
3732	auto *IDecl = dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
3733
3734	TagDecl *TD = nullptr;
3735	if (Type->isRecordType()) {
3736	TD = Type->castAs<RecordType>()->getDecl();
3737	}
3738	else if (Type->isEnumeralType()) {
3739	TD = Type->castAs<EnumType>()->getDecl();
3740	}
3741
3742	if (TD) {
3743	if (GlobalDefinedTags.count(Ptr: TD))
3744	return;
3745
3746	bool IsNamedDefinition = false;
3747	if (IsTagDefinedInsideClass(IDecl: IDecl, Tag: TD, IsNamedDefinition)) {
3748	RewriteObjCFieldDeclType(Type, Result);
3749	Result += ";";
3750	}
3751	if (IsNamedDefinition)
3752	GlobalDefinedTags.insert(Ptr: TD);
3753	}
3754	}
3755
3756	unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
3757	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3758	if (ObjCInterefaceHasBitfieldGroups.count(V: CDecl)) {
3759	return IvarGroupNumber[IV];
3760	}
3761	unsigned GroupNo = 0;
3762	SmallVector<const ObjCIvarDecl *, 8> IVars;
3763	for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3764	IVD; IVD = IVD->getNextIvar())
3765	IVars.push_back(Elt: IVD);
3766
3767	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3768	if (IVars[i]->isBitField()) {
3769	IvarGroupNumber[IVars[i++]] = ++GroupNo;
3770	while (i < e && IVars[i]->isBitField())
3771	IvarGroupNumber[IVars[i++]] = GroupNo;
3772	if (i < e)
3773	--i;
3774	}
3775
3776	ObjCInterefaceHasBitfieldGroups.insert(V: CDecl);
3777	return IvarGroupNumber[IV];
3778	}
3779
3780	QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
3781	ObjCIvarDecl *IV,
3782	SmallVectorImpl<ObjCIvarDecl *> &IVars) {
3783	std::string StructTagName;
3784	ObjCIvarBitfieldGroupType(IV, Result&: StructTagName);
3785	RecordDecl *RD = RecordDecl::Create(
3786	*Context, TagTypeKind::Struct, Context->getTranslationUnitDecl(),
3787	SourceLocation(), SourceLocation(), &Context->Idents.get(Name: StructTagName));
3788	for (unsigned i=0, e = IVars.size(); i < e; i++) {
3789	ObjCIvarDecl *Ivar = IVars[i];
3790	RD->addDecl(D: FieldDecl::Create(C: *Context, DC: RD, StartLoc: SourceLocation(), IdLoc: SourceLocation(),
3791	Id: &Context->Idents.get(Ivar->getName()),
3792	T: Ivar->getType(),
3793	TInfo: nullptr, /*Expr *BW */BW: Ivar->getBitWidth(),
3794	Mutable: false, InitStyle: ICIS_NoInit));
3795	}
3796	RD->completeDefinition();
3797	return Context->getTagDeclType(RD);
3798	}
3799
3800	QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
3801	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3802	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3803	std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(x&: CDecl, y&: GroupNo);
3804	if (GroupRecordType.count(Val: tuple))
3805	return GroupRecordType[tuple];
3806
3807	SmallVector<ObjCIvarDecl *, 8> IVars;
3808	for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3809	IVD; IVD = IVD->getNextIvar()) {
3810	if (IVD->isBitField())
3811	IVars.push_back(Elt: const_cast<ObjCIvarDecl *>(IVD));
3812	else {
3813	if (!IVars.empty()) {
3814	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV: IVars[0]);
3815	// Generate the struct type for this group of bitfield ivars.
3816	GroupRecordType[std::make_pair(x&: CDecl, y&: GroupNo)] =
3817	SynthesizeBitfieldGroupStructType(IV: IVars[0], IVars);
3818	IVars.clear();
3819	}
3820	}
3821	}
3822	if (!IVars.empty()) {
3823	// Do the last one.
3824	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV: IVars[0]);
3825	GroupRecordType[std::make_pair(x&: CDecl, y&: GroupNo)] =
3826	SynthesizeBitfieldGroupStructType(IV: IVars[0], IVars);
3827	}
3828	QualType RetQT = GroupRecordType[tuple];
3829	assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL");
3830
3831	return RetQT;
3832	}
3833
3834	/// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
3835	/// Name would be: classname__GRBF_n where n is the group number for this ivar.
3836	void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
3837	std::string &Result) {
3838	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3839	Result += CDecl->getName();
3840	Result += "__GRBF_";
3841	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3842	Result += utostr(X: GroupNo);
3843	}
3844
3845	/// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
3846	/// Name of the struct would be: classname__T_n where n is the group number for
3847	/// this ivar.
3848	void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
3849	std::string &Result) {
3850	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3851	Result += CDecl->getName();
3852	Result += "__T_";
3853	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3854	Result += utostr(X: GroupNo);
3855	}
3856
3857	/// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
3858	/// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
3859	/// this ivar.
3860	void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
3861	std::string &Result) {
3862	Result += "OBJC_IVAR_$_";
3863	ObjCIvarBitfieldGroupDecl(IV, Result);
3864	}
3865
3866	#define SKIP_BITFIELDS(IX, ENDIX, VEC) { \
3867	while ((IX < ENDIX) && VEC[IX]->isBitField()) \
3868	++IX; \
3869	if (IX < ENDIX) \
3870	--IX; \
3871	}
3872
3873	/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
3874	/// an objective-c class with ivars.
3875	void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
3876	std::string &Result) {
3877	assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
3878	assert(CDecl->getName() != "" &&
3879	"Name missing in SynthesizeObjCInternalStruct");
3880	ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
3881	SmallVector<ObjCIvarDecl *, 8> IVars;
3882	for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3883	IVD; IVD = IVD->getNextIvar())
3884	IVars.push_back(Elt: IVD);
3885
3886	SourceLocation LocStart = CDecl->getBeginLoc();
3887	SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
3888
3889	const char *startBuf = SM->getCharacterData(SL: LocStart);
3890	const char *endBuf = SM->getCharacterData(SL: LocEnd);
3891
3892	// If no ivars and no root or if its root, directly or indirectly,
3893	// have no ivars (thus not synthesized) then no need to synthesize this class.
3894	if ((!CDecl->isThisDeclarationADefinition() || IVars.size() == 0) &&
3895	(!RCDecl || !ObjCSynthesizedStructs.count(Ptr: RCDecl))) {
3896	endBuf += Lexer::MeasureTokenLength(Loc: LocEnd, SM: *SM, LangOpts);
3897	ReplaceText(Start: LocStart, OrigLength: endBuf-startBuf, Str: Result);
3898	return;
3899	}
3900
3901	// Insert named struct/union definitions inside class to
3902	// outer scope. This follows semantics of locally defined
3903	// struct/unions in objective-c classes.
3904	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3905	RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
3906
3907	// Insert named structs which are syntheized to group ivar bitfields
3908	// to outer scope as well.
3909	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3910	if (IVars[i]->isBitField()) {
3911	ObjCIvarDecl *IV = IVars[i];
3912	QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
3913	RewriteObjCFieldDeclType(Type&: QT, Result);
3914	Result += ";";
3915	// skip over ivar bitfields in this group.
3916	SKIP_BITFIELDS(i , e, IVars);
3917	}
3918
3919	Result += "\nstruct ";
3920	Result += CDecl->getNameAsString();
3921	Result += "_IMPL {\n";
3922
3923	if (RCDecl && ObjCSynthesizedStructs.count(Ptr: RCDecl)) {
3924	Result += "\tstruct "; Result += RCDecl->getNameAsString();
3925	Result += "_IMPL "; Result += RCDecl->getNameAsString();
3926	Result += "_IVARS;\n";
3927	}
3928
3929	for (unsigned i = 0, e = IVars.size(); i < e; i++) {
3930	if (IVars[i]->isBitField()) {
3931	ObjCIvarDecl *IV = IVars[i];
3932	Result += "\tstruct ";
3933	ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
3934	ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
3935	// skip over ivar bitfields in this group.
3936	SKIP_BITFIELDS(i , e, IVars);
3937	}
3938	else
3939	RewriteObjCFieldDecl(IVars[i], Result);
3940	}
3941
3942	Result += "};\n";
3943	endBuf += Lexer::MeasureTokenLength(Loc: LocEnd, SM: *SM, LangOpts);
3944	ReplaceText(Start: LocStart, OrigLength: endBuf-startBuf, Str: Result);
3945	// Mark this struct as having been generated.
3946	if (!ObjCSynthesizedStructs.insert(Ptr: CDecl).second)
3947	llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct");
3948	}
3949
3950	/// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
3951	/// have been referenced in an ivar access expression.
3952	void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
3953	std::string &Result) {
3954	// write out ivar offset symbols which have been referenced in an ivar
3955	// access expression.
3956	llvm::SmallSetVector<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
3957
3958	if (Ivars.empty())
3959	return;
3960
3961	llvm::DenseSet<std::pair<const ObjCInterfaceDecl*, unsigned> > GroupSymbolOutput;
3962	for (ObjCIvarDecl *IvarDecl : Ivars) {
3963	const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
3964	unsigned GroupNo = 0;
3965	if (IvarDecl->isBitField()) {
3966	GroupNo = ObjCIvarBitfieldGroupNo(IV: IvarDecl);
3967	if (GroupSymbolOutput.count(V: std::make_pair(x&: IDecl, y&: GroupNo)))
3968	continue;
3969	}
3970	Result += "\n";
3971	if (LangOpts.MicrosoftExt)
3972	Result += "__declspec(allocate(\".objc_ivar$B\")) ";
3973	Result += "extern \"C\" ";
3974	if (LangOpts.MicrosoftExt &&
3975	IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
3976	IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
3977	Result += "__declspec(dllimport) ";
3978
3979	Result += "unsigned long ";
3980	if (IvarDecl->isBitField()) {
3981	ObjCIvarBitfieldGroupOffset(IV: IvarDecl, Result);
3982	GroupSymbolOutput.insert(V: std::make_pair(x&: IDecl, y&: GroupNo));
3983	}
3984	else
3985	WriteInternalIvarName(IDecl: CDecl, IvarDecl, Result);
3986	Result += ";";
3987	}
3988	}
3989
3990	//===----------------------------------------------------------------------===//
3991	// Meta Data Emission
3992	//===----------------------------------------------------------------------===//
3993
3994	/// RewriteImplementations - This routine rewrites all method implementations
3995	/// and emits meta-data.
3996
3997	void RewriteModernObjC::RewriteImplementations() {
3998	int ClsDefCount = ClassImplementation.size();
3999	int CatDefCount = CategoryImplementation.size();
4000
4001	// Rewrite implemented methods
4002	for (int i = 0; i < ClsDefCount; i++) {
4003	ObjCImplementationDecl *OIMP = ClassImplementation[i];
4004	ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
4005	if (CDecl->isImplicitInterfaceDecl())
4006	assert(false &&
4007	"Legacy implicit interface rewriting not supported in moder abi");
4008	RewriteImplementationDecl(OIMP);
4009	}
4010
4011	for (int i = 0; i < CatDefCount; i++) {
4012	ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
4013	ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
4014	if (CDecl->isImplicitInterfaceDecl())
4015	assert(false &&
4016	"Legacy implicit interface rewriting not supported in moder abi");
4017	RewriteImplementationDecl(CIMP);
4018	}
4019	}
4020
4021	void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
4022	const std::string &Name,
4023	ValueDecl *VD, bool def) {
4024	assert(BlockByRefDeclNo.count(VD) &&
4025	"RewriteByRefString: ByRef decl missing");
4026	if (def)
4027	ResultStr += "struct ";
4028	ResultStr += "__Block_byref_" + Name +
4029	"_" + utostr(X: BlockByRefDeclNo[VD]) ;
4030	}
4031
4032	static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
4033	if (VarDecl *Var = dyn_cast<VarDecl>(Val: VD))
4034	return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
4035	return false;
4036	}
4037
4038	std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
4039	StringRef funcName,
4040	std::string Tag) {
4041	const FunctionType *AFT = CE->getFunctionType();
4042	QualType RT = AFT->getReturnType();
4043	std::string StructRef = "struct " + Tag;
4044	SourceLocation BlockLoc = CE->getExprLoc();
4045	std::string S;
4046	ConvertSourceLocationToLineDirective(Loc: BlockLoc, LineString&: S);
4047
4048	S += "static " + RT.getAsString(Policy: Context->getPrintingPolicy()) + " __" +
4049	funcName.str() + "_block_func_" + utostr(X: i);
4050
4051	BlockDecl *BD = CE->getBlockDecl();
4052
4053	if (isa<FunctionNoProtoType>(Val: AFT)) {
4054	// No user-supplied arguments. Still need to pass in a pointer to the
4055	// block (to reference imported block decl refs).
4056	S += "(" + StructRef + " *__cself)";
4057	} else if (BD->param_empty()) {
4058	S += "(" + StructRef + " *__cself)";
4059	} else {
4060	const FunctionProtoType *FT = cast<FunctionProtoType>(Val: AFT);
4061	assert(FT && "SynthesizeBlockFunc: No function proto");
4062	S += '(';
4063	// first add the implicit argument.
4064	S += StructRef + " *__cself, ";
4065	std::string ParamStr;
4066	for (BlockDecl::param_iterator AI = BD->param_begin(),
4067	E = BD->param_end(); AI != E; ++AI) {
4068	if (AI != BD->param_begin()) S += ", ";
4069	ParamStr = (*AI)->getNameAsString();
4070	QualType QT = (*AI)->getType();
4071	(void)convertBlockPointerToFunctionPointer(T&: QT);
4072	QT.getAsStringInternal(Str&: ParamStr, Policy: Context->getPrintingPolicy());
4073	S += ParamStr;
4074	}
4075	if (FT->isVariadic()) {
4076	if (!BD->param_empty()) S += ", ";
4077	S += "...";
4078	}
4079	S += ')';
4080	}
4081	S += " {\n";
4082
4083	// Create local declarations to avoid rewriting all closure decl ref exprs.
4084	// First, emit a declaration for all "by ref" decls.
4085	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4086	E = BlockByRefDecls.end(); I != E; ++I) {
4087	S += " ";
4088	std::string Name = (*I)->getNameAsString();
4089	std::string TypeString;
4090	RewriteByRefString(ResultStr&: TypeString, Name, VD: (*I));
4091	TypeString += " *";
4092	Name = TypeString + Name;
4093	S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
4094	}
4095	// Next, emit a declaration for all "by copy" declarations.
4096	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4097	E = BlockByCopyDecls.end(); I != E; ++I) {
4098	S += " ";
4099	// Handle nested closure invocation. For example:
4100	//
4101	// void (^myImportedClosure)(void);
4102	// myImportedClosure = ^(void) { setGlobalInt(x + y); };
4103	//
4104	// void (^anotherClosure)(void);
4105	// anotherClosure = ^(void) {
4106	// myImportedClosure(); // import and invoke the closure
4107	// };
4108	//
4109	if (isTopLevelBlockPointerType(T: (*I)->getType())) {
4110	RewriteBlockPointerTypeVariable(Str&: S, VD: (*I));
4111	S += " = (";
4112	RewriteBlockPointerType(Str&: S, Type: (*I)->getType());
4113	S += ")";
4114	S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
4115	}
4116	else {
4117	std::string Name = (*I)->getNameAsString();
4118	QualType QT = (*I)->getType();
4119	if (HasLocalVariableExternalStorage(VD: *I))
4120	QT = Context->getPointerType(T: QT);
4121	QT.getAsStringInternal(Str&: Name, Policy: Context->getPrintingPolicy());
4122	S += Name + " = __cself->" +
4123	(*I)->getNameAsString() + "; // bound by copy\n";
4124	}
4125	}
4126	std::string RewrittenStr = RewrittenBlockExprs[CE];
4127	const char *cstr = RewrittenStr.c_str();
4128	while (*cstr++ != '{') ;
4129	S += cstr;
4130	S += "\n";
4131	return S;
4132	}
4133
4134	std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
4135	StringRef funcName,
4136	std::string Tag) {
4137	std::string StructRef = "struct " + Tag;
4138	std::string S = "static void __";
4139
4140	S += funcName;
4141	S += "_block_copy_" + utostr(X: i);
4142	S += "(" + StructRef;
4143	S += "*dst, " + StructRef;
4144	S += "*src) {";
4145	for (ValueDecl *VD : ImportedBlockDecls) {
4146	S += "_Block_object_assign((void*)&dst->";
4147	S += VD->getNameAsString();
4148	S += ", (void*)src->";
4149	S += VD->getNameAsString();
4150	if (BlockByRefDeclsPtrSet.count(Ptr: VD))
4151	S += ", " + utostr(X: BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4152	else if (VD->getType()->isBlockPointerType())
4153	S += ", " + utostr(X: BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4154	else
4155	S += ", " + utostr(X: BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4156	}
4157	S += "}\n";
4158
4159	S += "\nstatic void __";
4160	S += funcName;
4161	S += "_block_dispose_" + utostr(X: i);
4162	S += "(" + StructRef;
4163	S += "*src) {";
4164	for (ValueDecl *VD : ImportedBlockDecls) {
4165	S += "_Block_object_dispose((void*)src->";
4166	S += VD->getNameAsString();
4167	if (BlockByRefDeclsPtrSet.count(Ptr: VD))
4168	S += ", " + utostr(X: BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4169	else if (VD->getType()->isBlockPointerType())
4170	S += ", " + utostr(X: BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4171	else
4172	S += ", " + utostr(X: BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4173	}
4174	S += "}\n";
4175	return S;
4176	}
4177
4178	std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
4179	std::string Desc) {
4180	std::string S = "\nstruct " + Tag;
4181	std::string Constructor = " " + Tag;
4182
4183	S += " {\n struct __block_impl impl;\n";
4184	S += " struct " + Desc;
4185	S += "* Desc;\n";
4186
4187	Constructor += "(void *fp, "; // Invoke function pointer.
4188	Constructor += "struct " + Desc; // Descriptor pointer.
4189	Constructor += " *desc";
4190
4191	if (BlockDeclRefs.size()) {
4192	// Output all "by copy" declarations.
4193	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4194	E = BlockByCopyDecls.end(); I != E; ++I) {
4195	S += " ";
4196	std::string FieldName = (*I)->getNameAsString();
4197	std::string ArgName = "_" + FieldName;
4198	// Handle nested closure invocation. For example:
4199	//
4200	// void (^myImportedBlock)(void);
4201	// myImportedBlock = ^(void) { setGlobalInt(x + y); };
4202	//
4203	// void (^anotherBlock)(void);
4204	// anotherBlock = ^(void) {
4205	// myImportedBlock(); // import and invoke the closure
4206	// };
4207	//
4208	if (isTopLevelBlockPointerType(T: (*I)->getType())) {
4209	S += "struct __block_impl *";
4210	Constructor += ", void *" + ArgName;
4211	} else {
4212	QualType QT = (*I)->getType();
4213	if (HasLocalVariableExternalStorage(VD: *I))
4214	QT = Context->getPointerType(T: QT);
4215	QT.getAsStringInternal(Str&: FieldName, Policy: Context->getPrintingPolicy());
4216	QT.getAsStringInternal(Str&: ArgName, Policy: Context->getPrintingPolicy());
4217	Constructor += ", " + ArgName;
4218	}
4219	S += FieldName + ";\n";
4220	}
4221	// Output all "by ref" declarations.
4222	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4223	E = BlockByRefDecls.end(); I != E; ++I) {
4224	S += " ";
4225	std::string FieldName = (*I)->getNameAsString();
4226	std::string ArgName = "_" + FieldName;
4227	{
4228	std::string TypeString;
4229	RewriteByRefString(ResultStr&: TypeString, Name: FieldName, VD: (*I));
4230	TypeString += " *";
4231	FieldName = TypeString + FieldName;
4232	ArgName = TypeString + ArgName;
4233	Constructor += ", " + ArgName;
4234	}
4235	S += FieldName + "; // by ref\n";
4236	}
4237	// Finish writing the constructor.
4238	Constructor += ", int flags=0)";
4239	// Initialize all "by copy" arguments.
4240	bool firsTime = true;
4241	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4242	E = BlockByCopyDecls.end(); I != E; ++I) {
4243	std::string Name = (*I)->getNameAsString();
4244	if (firsTime) {
4245	Constructor += " : ";
4246	firsTime = false;
4247	}
4248	else
4249	Constructor += ", ";
4250	if (isTopLevelBlockPointerType(T: (*I)->getType()))
4251	Constructor += Name + "((struct __block_impl *)_" + Name + ")";
4252	else
4253	Constructor += Name + "(_" + Name + ")";
4254	}
4255	// Initialize all "by ref" arguments.
4256	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4257	E = BlockByRefDecls.end(); I != E; ++I) {
4258	std::string Name = (*I)->getNameAsString();
4259	if (firsTime) {
4260	Constructor += " : ";
4261	firsTime = false;
4262	}
4263	else
4264	Constructor += ", ";
4265	Constructor += Name + "(_" + Name + "->__forwarding)";
4266	}
4267
4268	Constructor += " {\n";
4269	if (GlobalVarDecl)
4270	Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4271	else
4272	Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4273	Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4274
4275	Constructor += " Desc = desc;\n";
4276	} else {
4277	// Finish writing the constructor.
4278	Constructor += ", int flags=0) {\n";
4279	if (GlobalVarDecl)
4280	Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4281	else
4282	Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4283	Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4284	Constructor += " Desc = desc;\n";
4285	}
4286	Constructor += " ";
4287	Constructor += "}\n";
4288	S += Constructor;
4289	S += "};\n";
4290	return S;
4291	}
4292
4293	std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
4294	std::string ImplTag, int i,
4295	StringRef FunName,
4296	unsigned hasCopy) {
4297	std::string S = "\nstatic struct " + DescTag;
4298
4299	S += " {\n size_t reserved;\n";
4300	S += " size_t Block_size;\n";
4301	if (hasCopy) {
4302	S += " void (*copy)(struct ";
4303	S += ImplTag; S += "*, struct ";
4304	S += ImplTag; S += "*);\n";
4305
4306	S += " void (*dispose)(struct ";
4307	S += ImplTag; S += "*);\n";
4308	}
4309	S += "} ";
4310
4311	S += DescTag + "_DATA = { 0, sizeof(struct ";
4312	S += ImplTag + ")";
4313	if (hasCopy) {
4314	S += ", __" + FunName.str() + "_block_copy_" + utostr(X: i);
4315	S += ", __" + FunName.str() + "_block_dispose_" + utostr(X: i);
4316	}
4317	S += "};\n";
4318	return S;
4319	}
4320
4321	void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
4322	StringRef FunName) {
4323	bool RewriteSC = (GlobalVarDecl &&
4324	!Blocks.empty() &&
4325	GlobalVarDecl->getStorageClass() == SC_Static &&
4326	GlobalVarDecl->getType().getCVRQualifiers());
4327	if (RewriteSC) {
4328	std::string SC(" void __");
4329	SC += GlobalVarDecl->getNameAsString();
4330	SC += "() {}";
4331	InsertText(Loc: FunLocStart, Str: SC);
4332	}
4333
4334	// Insert closures that were part of the function.
4335	for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
4336	CollectBlockDeclRefInfo(Exp: Blocks[i]);
4337	// Need to copy-in the inner copied-in variables not actually used in this
4338	// block.
4339	for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
4340	DeclRefExpr *Exp = InnerDeclRefs[count++];
4341	ValueDecl *VD = Exp->getDecl();
4342	BlockDeclRefs.push_back(Elt: Exp);
4343	if (!VD->hasAttr<BlocksAttr>()) {
4344	if (!BlockByCopyDeclsPtrSet.count(Ptr: VD)) {
4345	BlockByCopyDeclsPtrSet.insert(Ptr: VD);
4346	BlockByCopyDecls.push_back(Elt: VD);
4347	}
4348	continue;
4349	}
4350
4351	if (!BlockByRefDeclsPtrSet.count(Ptr: VD)) {
4352	BlockByRefDeclsPtrSet.insert(Ptr: VD);
4353	BlockByRefDecls.push_back(Elt: VD);
4354	}
4355
4356	// imported objects in the inner blocks not used in the outer
4357	// blocks must be copied/disposed in the outer block as well.
4358	if (VD->getType()->isObjCObjectPointerType() ||
4359	VD->getType()->isBlockPointerType())
4360	ImportedBlockDecls.insert(Ptr: VD);
4361	}
4362
4363	std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(X: i);
4364	std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(X: i);
4365
4366	std::string CI = SynthesizeBlockImpl(CE: Blocks[i], Tag: ImplTag, Desc: DescTag);
4367
4368	InsertText(Loc: FunLocStart, Str: CI);
4369
4370	std::string CF = SynthesizeBlockFunc(CE: Blocks[i], i, funcName: FunName, Tag: ImplTag);
4371
4372	InsertText(Loc: FunLocStart, Str: CF);
4373
4374	if (ImportedBlockDecls.size()) {
4375	std::string HF = SynthesizeBlockHelperFuncs(CE: Blocks[i], i, funcName: FunName, Tag: ImplTag);
4376	InsertText(Loc: FunLocStart, Str: HF);
4377	}
4378	std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
4379	hasCopy: ImportedBlockDecls.size() > 0);
4380	InsertText(Loc: FunLocStart, Str: BD);
4381
4382	BlockDeclRefs.clear();
4383	BlockByRefDecls.clear();
4384	BlockByRefDeclsPtrSet.clear();
4385	BlockByCopyDecls.clear();
4386	BlockByCopyDeclsPtrSet.clear();
4387	ImportedBlockDecls.clear();
4388	}
4389	if (RewriteSC) {
4390	// Must insert any 'const/volatile/static here. Since it has been
4391	// removed as result of rewriting of block literals.
4392	std::string SC;
4393	if (GlobalVarDecl->getStorageClass() == SC_Static)
4394	SC = "static ";
4395	if (GlobalVarDecl->getType().isConstQualified())
4396	SC += "const ";
4397	if (GlobalVarDecl->getType().isVolatileQualified())
4398	SC += "volatile ";
4399	if (GlobalVarDecl->getType().isRestrictQualified())
4400	SC += "restrict ";
4401	InsertText(Loc: FunLocStart, Str: SC);
4402	}
4403	if (GlobalConstructionExp) {
4404	// extra fancy dance for global literal expression.
4405
4406	// Always the latest block expression on the block stack.
4407	std::string Tag = "__";
4408	Tag += FunName;
4409	Tag += "_block_impl_";
4410	Tag += utostr(X: Blocks.size()-1);
4411	std::string globalBuf = "static ";
4412	globalBuf += Tag; globalBuf += " ";
4413	std::string SStr;
4414
4415	llvm::raw_string_ostream constructorExprBuf(SStr);
4416	GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
4417	PrintingPolicy(LangOpts));
4418	globalBuf += constructorExprBuf.str();
4419	globalBuf += ";\n";
4420	InsertText(Loc: FunLocStart, Str: globalBuf);
4421	GlobalConstructionExp = nullptr;
4422	}
4423
4424	Blocks.clear();
4425	InnerDeclRefsCount.clear();
4426	InnerDeclRefs.clear();
4427	RewrittenBlockExprs.clear();
4428	}
4429
4430	void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
4431	SourceLocation FunLocStart =
4432	(!Blocks.empty()) ? getFunctionSourceLocation(R&: *this, FD)
4433	: FD->getTypeSpecStartLoc();
4434	StringRef FuncName = FD->getName();
4435
4436	SynthesizeBlockLiterals(FunLocStart, FunName: FuncName);
4437	}
4438
4439	static void BuildUniqueMethodName(std::string &Name,
4440	ObjCMethodDecl *MD) {
4441	ObjCInterfaceDecl *IFace = MD->getClassInterface();
4442	Name = std::string(IFace->getName());
4443	Name += "__" + MD->getSelector().getAsString();
4444	// Convert colons to underscores.
4445	std::string::size_type loc = 0;
4446	while ((loc = Name.find(c: ':', pos: loc)) != std::string::npos)
4447	Name.replace(pos: loc, n1: 1, s: "_");
4448	}
4449
4450	void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
4451	// fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
4452	// SourceLocation FunLocStart = MD->getBeginLoc();
4453	SourceLocation FunLocStart = MD->getBeginLoc();
4454	std::string FuncName;
4455	BuildUniqueMethodName(Name&: FuncName, MD);
4456	SynthesizeBlockLiterals(FunLocStart, FunName: FuncName);
4457	}
4458
4459	void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
4460	for (Stmt *SubStmt : S->children())
4461	if (SubStmt) {
4462	if (BlockExpr *CBE = dyn_cast<BlockExpr>(Val: SubStmt))
4463	GetBlockDeclRefExprs(S: CBE->getBody());
4464	else
4465	GetBlockDeclRefExprs(S: SubStmt);
4466	}
4467	// Handle specific things.
4468	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: S))
4469	if (DRE->refersToEnclosingVariableOrCapture() ||
4470	HasLocalVariableExternalStorage(VD: DRE->getDecl()))
4471	// FIXME: Handle enums.
4472	BlockDeclRefs.push_back(Elt: DRE);
4473	}
4474
4475	void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
4476	SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
4477	llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
4478	for (Stmt *SubStmt : S->children())
4479	if (SubStmt) {
4480	if (BlockExpr *CBE = dyn_cast<BlockExpr>(Val: SubStmt)) {
4481	InnerContexts.insert(Ptr: cast<DeclContext>(Val: CBE->getBlockDecl()));
4482	GetInnerBlockDeclRefExprs(S: CBE->getBody(),
4483	InnerBlockDeclRefs,
4484	InnerContexts);
4485	}
4486	else
4487	GetInnerBlockDeclRefExprs(S: SubStmt, InnerBlockDeclRefs, InnerContexts);
4488	}
4489	// Handle specific things.
4490	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: S)) {
4491	if (DRE->refersToEnclosingVariableOrCapture() ||
4492	HasLocalVariableExternalStorage(VD: DRE->getDecl())) {
4493	if (!InnerContexts.count(Ptr: DRE->getDecl()->getDeclContext()))
4494	InnerBlockDeclRefs.push_back(Elt: DRE);
4495	if (VarDecl *Var = cast<VarDecl>(Val: DRE->getDecl()))
4496	if (Var->isFunctionOrMethodVarDecl())
4497	ImportedLocalExternalDecls.insert(Ptr: Var);
4498	}
4499	}
4500	}
4501
4502	/// convertObjCTypeToCStyleType - This routine converts such objc types
4503	/// as qualified objects, and blocks to their closest c/c++ types that
4504	/// it can. It returns true if input type was modified.
4505	bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
4506	QualType oldT = T;
4507	convertBlockPointerToFunctionPointer(T);
4508	if (T->isFunctionPointerType()) {
4509	QualType PointeeTy;
4510	if (const PointerType* PT = T->getAs<PointerType>()) {
4511	PointeeTy = PT->getPointeeType();
4512	if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
4513	T = convertFunctionTypeOfBlocks(FT);
4514	T = Context->getPointerType(T);
4515	}
4516	}
4517	}
4518
4519	convertToUnqualifiedObjCType(T);
4520	return T != oldT;
4521	}
4522
4523	/// convertFunctionTypeOfBlocks - This routine converts a function type
4524	/// whose result type may be a block pointer or whose argument type(s)
4525	/// might be block pointers to an equivalent function type replacing
4526	/// all block pointers to function pointers.
4527	QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
4528	const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(Val: FT);
4529	// FTP will be null for closures that don't take arguments.
4530	// Generate a funky cast.
4531	SmallVector<QualType, 8> ArgTypes;
4532	QualType Res = FT->getReturnType();
4533	bool modified = convertObjCTypeToCStyleType(T&: Res);
4534
4535	if (FTP) {
4536	for (auto &I : FTP->param_types()) {
4537	QualType t = I;
4538	// Make sure we convert "t (^)(...)" to "t (*)(...)".
4539	if (convertObjCTypeToCStyleType(T&: t))
4540	modified = true;
4541	ArgTypes.push_back(Elt: t);
4542	}
4543	}
4544	QualType FuncType;
4545	if (modified)
4546	FuncType = getSimpleFunctionType(result: Res, args: ArgTypes);
4547	else FuncType = QualType(FT, 0);
4548	return FuncType;
4549	}
4550
4551	Stmt *RewriteModernObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
4552	// Navigate to relevant type information.
4553	const BlockPointerType *CPT = nullptr;
4554
4555	if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: BlockExp)) {
4556	CPT = DRE->getType()->getAs<BlockPointerType>();
4557	} else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(Val: BlockExp)) {
4558	CPT = MExpr->getType()->getAs<BlockPointerType>();
4559	}
4560	else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(Val: BlockExp)) {
4561	return SynthesizeBlockCall(Exp, BlockExp: PRE->getSubExpr());
4562	}
4563	else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(Val: BlockExp))
4564	CPT = IEXPR->getType()->getAs<BlockPointerType>();
4565	else if (const ConditionalOperator *CEXPR =
4566	dyn_cast<ConditionalOperator>(Val: BlockExp)) {
4567	Expr *LHSExp = CEXPR->getLHS();
4568	Stmt *LHSStmt = SynthesizeBlockCall(Exp, BlockExp: LHSExp);
4569	Expr *RHSExp = CEXPR->getRHS();
4570	Stmt *RHSStmt = SynthesizeBlockCall(Exp, BlockExp: RHSExp);
4571	Expr *CONDExp = CEXPR->getCond();
4572	ConditionalOperator *CondExpr = new (Context) ConditionalOperator(
4573	CONDExp, SourceLocation(), cast<Expr>(Val: LHSStmt), SourceLocation(),
4574	cast<Expr>(Val: RHSStmt), Exp->getType(), VK_PRValue, OK_Ordinary);
4575	return CondExpr;
4576	} else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(Val: BlockExp)) {
4577	CPT = IRE->getType()->getAs<BlockPointerType>();
4578	} else if (const PseudoObjectExpr *POE
4579	= dyn_cast<PseudoObjectExpr>(Val: BlockExp)) {
4580	CPT = POE->getType()->castAs<BlockPointerType>();
4581	} else {
4582	assert(false && "RewriteBlockClass: Bad type");
4583	}
4584	assert(CPT && "RewriteBlockClass: Bad type");
4585	const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
4586	assert(FT && "RewriteBlockClass: Bad type");
4587	const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(Val: FT);
4588	// FTP will be null for closures that don't take arguments.
4589
4590	RecordDecl *RD = RecordDecl::Create(*Context, TagTypeKind::Struct, TUDecl,
4591	SourceLocation(), SourceLocation(),
4592	&Context->Idents.get(Name: "__block_impl"));
4593	QualType PtrBlock = Context->getPointerType(T: Context->getTagDeclType(RD));
4594
4595	// Generate a funky cast.
4596	SmallVector<QualType, 8> ArgTypes;
4597
4598	// Push the block argument type.
4599	ArgTypes.push_back(Elt: PtrBlock);
4600	if (FTP) {
4601	for (auto &I : FTP->param_types()) {
4602	QualType t = I;
4603	// Make sure we convert "t (^)(...)" to "t (*)(...)".
4604	if (!convertBlockPointerToFunctionPointer(T&: t))
4605	convertToUnqualifiedObjCType(T&: t);
4606	ArgTypes.push_back(Elt: t);
4607	}
4608	}
4609	// Now do the pointer to function cast.
4610	QualType PtrToFuncCastType = getSimpleFunctionType(result: Exp->getType(), args: ArgTypes);
4611
4612	PtrToFuncCastType = Context->getPointerType(T: PtrToFuncCastType);
4613
4614	CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: PtrBlock,
4615	Kind: CK_BitCast,
4616	E: const_cast<Expr*>(BlockExp));
4617	// Don't forget the parens to enforce the proper binding.
4618	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4619	BlkCast);
4620	//PE->dump();
4621
4622	FieldDecl *FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
4623	IdLoc: SourceLocation(),
4624	Id: &Context->Idents.get(Name: "FuncPtr"),
4625	T: Context->VoidPtrTy, TInfo: nullptr,
4626	/*BitWidth=*/BW: nullptr, /*Mutable=*/true,
4627	InitStyle: ICIS_NoInit);
4628	MemberExpr *ME = MemberExpr::CreateImplicit(
4629	C: *Context, Base: PE, IsArrow: true, MemberDecl: FD, T: FD->getType(), VK: VK_LValue, OK: OK_Ordinary);
4630
4631	CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
4632	CK_BitCast, ME);
4633	PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
4634
4635	SmallVector<Expr*, 8> BlkExprs;
4636	// Add the implicit argument.
4637	BlkExprs.push_back(BlkCast);
4638	// Add the user arguments.
4639	for (CallExpr::arg_iterator I = Exp->arg_begin(),
4640	E = Exp->arg_end(); I != E; ++I) {
4641	BlkExprs.push_back(*I);
4642	}
4643	CallExpr *CE =
4644	CallExpr::Create(Ctx: *Context, Fn: PE, Args: BlkExprs, Ty: Exp->getType(), VK: VK_PRValue,
4645	RParenLoc: SourceLocation(), FPFeatures: FPOptionsOverride());
4646	return CE;
4647	}
4648
4649	// We need to return the rewritten expression to handle cases where the
4650	// DeclRefExpr is embedded in another expression being rewritten.
4651	// For example:
4652	//
4653	// int main() {
4654	// __block Foo *f;
4655	// __block int i;
4656	//
4657	// void (^myblock)() = ^() {
4658	// [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
4659	// i = 77;
4660	// };
4661	//}
4662	Stmt *RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
4663	// Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
4664	// for each DeclRefExp where BYREFVAR is name of the variable.
4665	ValueDecl *VD = DeclRefExp->getDecl();
4666	bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
4667	HasLocalVariableExternalStorage(VD: DeclRefExp->getDecl());
4668
4669	FieldDecl *FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
4670	IdLoc: SourceLocation(),
4671	Id: &Context->Idents.get(Name: "__forwarding"),
4672	T: Context->VoidPtrTy, TInfo: nullptr,
4673	/*BitWidth=*/BW: nullptr, /*Mutable=*/true,
4674	InitStyle: ICIS_NoInit);
4675	MemberExpr *ME = MemberExpr::CreateImplicit(
4676	C: *Context, Base: DeclRefExp, IsArrow: isArrow, MemberDecl: FD, T: FD->getType(), VK: VK_LValue, OK: OK_Ordinary);
4677
4678	StringRef Name = VD->getName();
4679	FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(), IdLoc: SourceLocation(),
4680	Id: &Context->Idents.get(Name),
4681	T: Context->VoidPtrTy, TInfo: nullptr,
4682	/*BitWidth=*/BW: nullptr, /*Mutable=*/true,
4683	InitStyle: ICIS_NoInit);
4684	ME = MemberExpr::CreateImplicit(C: *Context, Base: ME, IsArrow: true, MemberDecl: FD, T: DeclRefExp->getType(),
4685	VK: VK_LValue, OK: OK_Ordinary);
4686
4687	// Need parens to enforce precedence.
4688	ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
4689	DeclRefExp->getExprLoc(),
4690	ME);
4691	ReplaceStmt(DeclRefExp, PE);
4692	return PE;
4693	}
4694
4695	// Rewrites the imported local variable V with external storage
4696	// (static, extern, etc.) as *V
4697	//
4698	Stmt *RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
4699	ValueDecl *VD = DRE->getDecl();
4700	if (VarDecl *Var = dyn_cast<VarDecl>(Val: VD))
4701	if (!ImportedLocalExternalDecls.count(Ptr: Var))
4702	return DRE;
4703	Expr *Exp = UnaryOperator::Create(
4704	C: const_cast<ASTContext &>(*Context), input: DRE, opc: UO_Deref, type: DRE->getType(),
4705	VK: VK_LValue, OK: OK_Ordinary, l: DRE->getLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
4706	// Need parens to enforce precedence.
4707	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4708	Exp);
4709	ReplaceStmt(DRE, PE);
4710	return PE;
4711	}
4712
4713	void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
4714	SourceLocation LocStart = CE->getLParenLoc();
4715	SourceLocation LocEnd = CE->getRParenLoc();
4716
4717	// Need to avoid trying to rewrite synthesized casts.
4718	if (LocStart.isInvalid())
4719	return;
4720	// Need to avoid trying to rewrite casts contained in macros.
4721	if (!Rewriter::isRewritable(Loc: LocStart) || !Rewriter::isRewritable(Loc: LocEnd))
4722	return;
4723
4724	const char *startBuf = SM->getCharacterData(SL: LocStart);
4725	const char *endBuf = SM->getCharacterData(SL: LocEnd);
4726	QualType QT = CE->getType();
4727	const Type* TypePtr = QT->getAs<Type>();
4728	if (isa<TypeOfExprType>(Val: TypePtr)) {
4729	const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(Val: TypePtr);
4730	QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
4731	std::string TypeAsString = "(";
4732	RewriteBlockPointerType(Str&: TypeAsString, Type: QT);
4733	TypeAsString += ")";
4734	ReplaceText(Start: LocStart, OrigLength: endBuf-startBuf+1, Str: TypeAsString);
4735	return;
4736	}
4737	// advance the location to startArgList.
4738	const char *argPtr = startBuf;
4739
4740	while (*argPtr++ && (argPtr < endBuf)) {
4741	switch (*argPtr) {
4742	case '^':
4743	// Replace the '^' with '*'.
4744	LocStart = LocStart.getLocWithOffset(Offset: argPtr-startBuf);
4745	ReplaceText(Start: LocStart, OrigLength: 1, Str: "*");
4746	break;
4747	}
4748	}
4749	}
4750
4751	void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
4752	CastKind CastKind = IC->getCastKind();
4753	if (CastKind != CK_BlockPointerToObjCPointerCast &&
4754	CastKind != CK_AnyPointerToBlockPointerCast)
4755	return;
4756
4757	QualType QT = IC->getType();
4758	(void)convertBlockPointerToFunctionPointer(T&: QT);
4759	std::string TypeString(QT.getAsString(Policy: Context->getPrintingPolicy()));
4760	std::string Str = "(";
4761	Str += TypeString;
4762	Str += ")";
4763	InsertText(Loc: IC->getSubExpr()->getBeginLoc(), Str);
4764	}
4765
4766	void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
4767	SourceLocation DeclLoc = FD->getLocation();
4768	unsigned parenCount = 0;
4769
4770	// We have 1 or more arguments that have closure pointers.
4771	const char *startBuf = SM->getCharacterData(SL: DeclLoc);
4772	const char *startArgList = strchr(s: startBuf, c: '(');
4773
4774	assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
4775
4776	parenCount++;
4777	// advance the location to startArgList.
4778	DeclLoc = DeclLoc.getLocWithOffset(Offset: startArgList-startBuf);
4779	assert((DeclLoc.isValid()) && "Invalid DeclLoc");
4780
4781	const char *argPtr = startArgList;
4782
4783	while (*argPtr++ && parenCount) {
4784	switch (*argPtr) {
4785	case '^':
4786	// Replace the '^' with '*'.
4787	DeclLoc = DeclLoc.getLocWithOffset(Offset: argPtr-startArgList);
4788	ReplaceText(Start: DeclLoc, OrigLength: 1, Str: "*");
4789	break;
4790	case '(':
4791	parenCount++;
4792	break;
4793	case ')':
4794	parenCount--;
4795	break;
4796	}
4797	}
4798	}
4799
4800	bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
4801	const FunctionProtoType *FTP;
4802	const PointerType *PT = QT->getAs<PointerType>();
4803	if (PT) {
4804	FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4805	} else {
4806	const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4807	assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4808	FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4809	}
4810	if (FTP) {
4811	for (const auto &I : FTP->param_types())
4812	if (isTopLevelBlockPointerType(T: I))
4813	return true;
4814	}
4815	return false;
4816	}
4817
4818	bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
4819	const FunctionProtoType *FTP;
4820	const PointerType *PT = QT->getAs<PointerType>();
4821	if (PT) {
4822	FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4823	} else {
4824	const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4825	assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4826	FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4827	}
4828	if (FTP) {
4829	for (const auto &I : FTP->param_types()) {
4830	if (I->isObjCQualifiedIdType())
4831	return true;
4832	if (I->isObjCObjectPointerType() &&
4833	I->getPointeeType()->isObjCQualifiedInterfaceType())
4834	return true;
4835	}
4836
4837	}
4838	return false;
4839	}
4840
4841	void RewriteModernObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
4842	const char *&RParen) {
4843	const char *argPtr = strchr(s: Name, c: '(');
4844	assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
4845
4846	LParen = argPtr; // output the start.
4847	argPtr++; // skip past the left paren.
4848	unsigned parenCount = 1;
4849
4850	while (*argPtr && parenCount) {
4851	switch (*argPtr) {
4852	case '(': parenCount++; break;
4853	case ')': parenCount--; break;
4854	default: break;
4855	}
4856	if (parenCount) argPtr++;
4857	}
4858	assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
4859	RParen = argPtr; // output the end
4860	}
4861
4862	void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
4863	if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Val: ND)) {
4864	RewriteBlockPointerFunctionArgs(FD);
4865	return;
4866	}
4867	// Handle Variables and Typedefs.
4868	SourceLocation DeclLoc = ND->getLocation();
4869	QualType DeclT;
4870	if (VarDecl *VD = dyn_cast<VarDecl>(Val: ND))
4871	DeclT = VD->getType();
4872	else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(Val: ND))
4873	DeclT = TDD->getUnderlyingType();
4874	else if (FieldDecl *FD = dyn_cast<FieldDecl>(Val: ND))
4875	DeclT = FD->getType();
4876	else
4877	llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
4878
4879	const char *startBuf = SM->getCharacterData(SL: DeclLoc);
4880	const char *endBuf = startBuf;
4881	// scan backward (from the decl location) for the end of the previous decl.
4882	while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
4883	startBuf--;
4884	SourceLocation Start = DeclLoc.getLocWithOffset(Offset: startBuf-endBuf);
4885	std::string buf;
4886	unsigned OrigLength=0;
4887	// *startBuf != '^' if we are dealing with a pointer to function that
4888	// may take block argument types (which will be handled below).
4889	if (*startBuf == '^') {
4890	// Replace the '^' with '*', computing a negative offset.
4891	buf = '*';
4892	startBuf++;
4893	OrigLength++;
4894	}
4895	while (*startBuf != ')') {
4896	buf += *startBuf;
4897	startBuf++;
4898	OrigLength++;
4899	}
4900	buf += ')';
4901	OrigLength++;
4902
4903	if (PointerTypeTakesAnyBlockArguments(QT: DeclT) ||
4904	PointerTypeTakesAnyObjCQualifiedType(QT: DeclT)) {
4905	// Replace the '^' with '*' for arguments.
4906	// Replace id<P> with id/*<>*/
4907	DeclLoc = ND->getLocation();
4908	startBuf = SM->getCharacterData(SL: DeclLoc);
4909	const char *argListBegin, *argListEnd;
4910	GetExtentOfArgList(Name: startBuf, LParen&: argListBegin, RParen&: argListEnd);
4911	while (argListBegin < argListEnd) {
4912	if (*argListBegin == '^')
4913	buf += '*';
4914	else if (*argListBegin == '<') {
4915	buf += "/*";
4916	buf += *argListBegin++;
4917	OrigLength++;
4918	while (*argListBegin != '>') {
4919	buf += *argListBegin++;
4920	OrigLength++;
4921	}
4922	buf += *argListBegin;
4923	buf += "*/";
4924	}
4925	else
4926	buf += *argListBegin;
4927	argListBegin++;
4928	OrigLength++;
4929	}
4930	buf += ')';
4931	OrigLength++;
4932	}
4933	ReplaceText(Start, OrigLength, Str: buf);
4934	}
4935
4936	/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
4937	/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
4938	/// struct Block_byref_id_object *src) {
4939	/// _Block_object_assign (&_dest->object, _src->object,
4940	/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4941	/// [|BLOCK_FIELD_IS_WEAK]) // object
4942	/// _Block_object_assign(&_dest->object, _src->object,
4943	/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4944	/// [|BLOCK_FIELD_IS_WEAK]) // block
4945	/// }
4946	/// And:
4947	/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
4948	/// _Block_object_dispose(_src->object,
4949	/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4950	/// [|BLOCK_FIELD_IS_WEAK]) // object
4951	/// _Block_object_dispose(_src->object,
4952	/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4953	/// [|BLOCK_FIELD_IS_WEAK]) // block
4954	/// }
4955
4956	std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
4957	int flag) {
4958	std::string S;
4959	if (CopyDestroyCache.count(V: flag))
4960	return S;
4961	CopyDestroyCache.insert(V: flag);
4962	S = "static void __Block_byref_id_object_copy_";
4963	S += utostr(X: flag);
4964	S += "(void *dst, void *src) {\n";
4965
4966	// offset into the object pointer is computed as:
4967	// void * + void* + int + int + void* + void *
4968	unsigned IntSize =
4969	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
4970	unsigned VoidPtrSize =
4971	static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
4972
4973	unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
4974	S += " _Block_object_assign((char*)dst + ";
4975	S += utostr(X: offset);
4976	S += ", *(void * *) ((char*)src + ";
4977	S += utostr(X: offset);
4978	S += "), ";
4979	S += utostr(X: flag);
4980	S += ");\n}\n";
4981
4982	S += "static void __Block_byref_id_object_dispose_";
4983	S += utostr(X: flag);
4984	S += "(void *src) {\n";
4985	S += " _Block_object_dispose(*(void * *) ((char*)src + ";
4986	S += utostr(X: offset);
4987	S += "), ";
4988	S += utostr(X: flag);
4989	S += ");\n}\n";
4990	return S;
4991	}
4992
4993	/// RewriteByRefVar - For each __block typex ND variable this routine transforms
4994	/// the declaration into:
4995	/// struct __Block_byref_ND {
4996	/// void *__isa; // NULL for everything except __weak pointers
4997	/// struct __Block_byref_ND *__forwarding;
4998	/// int32_t __flags;
4999	/// int32_t __size;
5000	/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
5001	/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
5002	/// typex ND;
5003	/// };
5004	///
5005	/// It then replaces declaration of ND variable with:
5006	/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
5007	/// __size=sizeof(struct __Block_byref_ND),
5008	/// ND=initializer-if-any};
5009	///
5010	///
5011	void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
5012	bool lastDecl) {
5013	int flag = 0;
5014	int isa = 0;
5015	SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
5016	if (DeclLoc.isInvalid())
5017	// If type location is missing, it is because of missing type (a warning).
5018	// Use variable's location which is good for this case.
5019	DeclLoc = ND->getLocation();
5020	const char *startBuf = SM->getCharacterData(SL: DeclLoc);
5021	SourceLocation X = ND->getEndLoc();
5022	X = SM->getExpansionLoc(Loc: X);
5023	const char *endBuf = SM->getCharacterData(SL: X);
5024	std::string Name(ND->getNameAsString());
5025	std::string ByrefType;
5026	RewriteByRefString(ByrefType, Name, ND, true);
5027	ByrefType += " {\n";
5028	ByrefType += " void *__isa;\n";
5029	RewriteByRefString(ByrefType, Name, ND);
5030	ByrefType += " *__forwarding;\n";
5031	ByrefType += " int __flags;\n";
5032	ByrefType += " int __size;\n";
5033	// Add void *__Block_byref_id_object_copy;
5034	// void *__Block_byref_id_object_dispose; if needed.
5035	QualType Ty = ND->getType();
5036	bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, D: ND);
5037	if (HasCopyAndDispose) {
5038	ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
5039	ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
5040	}
5041
5042	QualType T = Ty;
5043	(void)convertBlockPointerToFunctionPointer(T);
5044	T.getAsStringInternal(Str&: Name, Policy: Context->getPrintingPolicy());
5045
5046	ByrefType += " " + Name + ";\n";
5047	ByrefType += "};\n";
5048	// Insert this type in global scope. It is needed by helper function.
5049	SourceLocation FunLocStart;
5050	if (CurFunctionDef)
5051	FunLocStart = getFunctionSourceLocation(R&: *this, FD: CurFunctionDef);
5052	else {
5053	assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
5054	FunLocStart = CurMethodDef->getBeginLoc();
5055	}
5056	InsertText(Loc: FunLocStart, Str: ByrefType);
5057
5058	if (Ty.isObjCGCWeak()) {
5059	flag |= BLOCK_FIELD_IS_WEAK;
5060	isa = 1;
5061	}
5062	if (HasCopyAndDispose) {
5063	flag = BLOCK_BYREF_CALLER;
5064	QualType Ty = ND->getType();
5065	// FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
5066	if (Ty->isBlockPointerType())
5067	flag |= BLOCK_FIELD_IS_BLOCK;
5068	else
5069	flag |= BLOCK_FIELD_IS_OBJECT;
5070	std::string HF = SynthesizeByrefCopyDestroyHelper(VD: ND, flag);
5071	if (!HF.empty())
5072	Preamble += HF;
5073	}
5074
5075	// struct __Block_byref_ND ND =
5076	// {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
5077	// initializer-if-any};
5078	bool hasInit = (ND->getInit() != nullptr);
5079	// FIXME. rewriter does not support __block c++ objects which
5080	// require construction.
5081	if (hasInit)
5082	if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(Val: ND->getInit())) {
5083	CXXConstructorDecl *CXXDecl = CExp->getConstructor();
5084	if (CXXDecl && CXXDecl->isDefaultConstructor())
5085	hasInit = false;
5086	}
5087
5088	unsigned flags = 0;
5089	if (HasCopyAndDispose)
5090	flags |= BLOCK_HAS_COPY_DISPOSE;
5091	Name = ND->getNameAsString();
5092	ByrefType.clear();
5093	RewriteByRefString(ByrefType, Name, ND);
5094	std::string ForwardingCastType("(");
5095	ForwardingCastType += ByrefType + " *)";
5096	ByrefType += " " + Name + " = {(void*)";
5097	ByrefType += utostr(X: isa);
5098	ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
5099	ByrefType += utostr(X: flags);
5100	ByrefType += ", ";
5101	ByrefType += "sizeof(";
5102	RewriteByRefString(ByrefType, Name, ND);
5103	ByrefType += ")";
5104	if (HasCopyAndDispose) {
5105	ByrefType += ", __Block_byref_id_object_copy_";
5106	ByrefType += utostr(X: flag);
5107	ByrefType += ", __Block_byref_id_object_dispose_";
5108	ByrefType += utostr(X: flag);
5109	}
5110
5111	if (!firstDecl) {
5112	// In multiple __block declarations, and for all but 1st declaration,
5113	// find location of the separating comma. This would be start location
5114	// where new text is to be inserted.
5115	DeclLoc = ND->getLocation();
5116	const char *startDeclBuf = SM->getCharacterData(SL: DeclLoc);
5117	const char *commaBuf = startDeclBuf;
5118	while (*commaBuf != ',')
5119	commaBuf--;
5120	assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','");
5121	DeclLoc = DeclLoc.getLocWithOffset(Offset: commaBuf - startDeclBuf);
5122	startBuf = commaBuf;
5123	}
5124
5125	if (!hasInit) {
5126	ByrefType += "};\n";
5127	unsigned nameSize = Name.size();
5128	// for block or function pointer declaration. Name is already
5129	// part of the declaration.
5130	if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
5131	nameSize = 1;
5132	ReplaceText(Start: DeclLoc, OrigLength: endBuf-startBuf+nameSize, Str: ByrefType);
5133	}
5134	else {
5135	ByrefType += ", ";
5136	SourceLocation startLoc;
5137	Expr *E = ND->getInit();
5138	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(Val: E))
5139	startLoc = ECE->getLParenLoc();
5140	else
5141	startLoc = E->getBeginLoc();
5142	startLoc = SM->getExpansionLoc(Loc: startLoc);
5143	endBuf = SM->getCharacterData(SL: startLoc);
5144	ReplaceText(Start: DeclLoc, OrigLength: endBuf-startBuf, Str: ByrefType);
5145
5146	const char separator = lastDecl ? ';' : ',';
5147	const char *startInitializerBuf = SM->getCharacterData(SL: startLoc);
5148	const char *separatorBuf = strchr(s: startInitializerBuf, c: separator);
5149	assert((*separatorBuf == separator) &&
5150	"RewriteByRefVar: can't find ';' or ','");
5151	SourceLocation separatorLoc =
5152	startLoc.getLocWithOffset(Offset: separatorBuf-startInitializerBuf);
5153
5154	InsertText(Loc: separatorLoc, Str: lastDecl ? "}" : "};\n");
5155	}
5156	}
5157
5158	void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
5159	// Add initializers for any closure decl refs.
5160	GetBlockDeclRefExprs(S: Exp->getBody());
5161	if (BlockDeclRefs.size()) {
5162	// Unique all "by copy" declarations.
5163	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5164	if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5165	if (!BlockByCopyDeclsPtrSet.count(Ptr: BlockDeclRefs[i]->getDecl())) {
5166	BlockByCopyDeclsPtrSet.insert(Ptr: BlockDeclRefs[i]->getDecl());
5167	BlockByCopyDecls.push_back(Elt: BlockDeclRefs[i]->getDecl());
5168	}
5169	}
5170	// Unique all "by ref" declarations.
5171	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5172	if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5173	if (!BlockByRefDeclsPtrSet.count(Ptr: BlockDeclRefs[i]->getDecl())) {
5174	BlockByRefDeclsPtrSet.insert(Ptr: BlockDeclRefs[i]->getDecl());
5175	BlockByRefDecls.push_back(Elt: BlockDeclRefs[i]->getDecl());
5176	}
5177	}
5178	// Find any imported blocks...they will need special attention.
5179	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5180	if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5181	BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5182	BlockDeclRefs[i]->getType()->isBlockPointerType())
5183	ImportedBlockDecls.insert(Ptr: BlockDeclRefs[i]->getDecl());
5184	}
5185	}
5186
5187	FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
5188	IdentifierInfo *ID = &Context->Idents.get(Name: name);
5189	QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
5190	return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
5191	SourceLocation(), ID, FType, nullptr, SC_Extern,
5192	false, false);
5193	}
5194
5195	Stmt *RewriteModernObjC::SynthBlockInitExpr(BlockExpr *Exp,
5196	const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
5197	const BlockDecl *block = Exp->getBlockDecl();
5198
5199	Blocks.push_back(Elt: Exp);
5200
5201	CollectBlockDeclRefInfo(Exp);
5202
5203	// Add inner imported variables now used in current block.
5204	int countOfInnerDecls = 0;
5205	if (!InnerBlockDeclRefs.empty()) {
5206	for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
5207	DeclRefExpr *Exp = InnerBlockDeclRefs[i];
5208	ValueDecl *VD = Exp->getDecl();
5209	if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
5210	// We need to save the copied-in variables in nested
5211	// blocks because it is needed at the end for some of the API generations.
5212	// See SynthesizeBlockLiterals routine.
5213	InnerDeclRefs.push_back(Elt: Exp); countOfInnerDecls++;
5214	BlockDeclRefs.push_back(Elt: Exp);
5215	BlockByCopyDeclsPtrSet.insert(Ptr: VD);
5216	BlockByCopyDecls.push_back(Elt: VD);
5217	}
5218	if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
5219	InnerDeclRefs.push_back(Elt: Exp); countOfInnerDecls++;
5220	BlockDeclRefs.push_back(Elt: Exp);
5221	BlockByRefDeclsPtrSet.insert(Ptr: VD);
5222	BlockByRefDecls.push_back(Elt: VD);
5223	}
5224	}
5225	// Find any imported blocks...they will need special attention.
5226	for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
5227	if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5228	InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5229	InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
5230	ImportedBlockDecls.insert(Ptr: InnerBlockDeclRefs[i]->getDecl());
5231	}
5232	InnerDeclRefsCount.push_back(Elt: countOfInnerDecls);
5233
5234	std::string FuncName;
5235
5236	if (CurFunctionDef)
5237	FuncName = CurFunctionDef->getNameAsString();
5238	else if (CurMethodDef)
5239	BuildUniqueMethodName(Name&: FuncName, MD: CurMethodDef);
5240	else if (GlobalVarDecl)
5241	FuncName = std::string(GlobalVarDecl->getNameAsString());
5242
5243	bool GlobalBlockExpr =
5244	block->getDeclContext()->getRedeclContext()->isFileContext();
5245
5246	if (GlobalBlockExpr && !GlobalVarDecl) {
5247	Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
5248	GlobalBlockExpr = false;
5249	}
5250
5251	std::string BlockNumber = utostr(X: Blocks.size()-1);
5252
5253	std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
5254
5255	// Get a pointer to the function type so we can cast appropriately.
5256	QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
5257	QualType FType = Context->getPointerType(T: BFT);
5258
5259	FunctionDecl *FD;
5260	Expr *NewRep;
5261
5262	// Simulate a constructor call...
5263	std::string Tag;
5264
5265	if (GlobalBlockExpr)
5266	Tag = "__global_";
5267	else
5268	Tag = "__";
5269	Tag += FuncName + "_block_impl_" + BlockNumber;
5270
5271	FD = SynthBlockInitFunctionDecl(name: Tag);
5272	DeclRefExpr *DRE = new (Context)
5273	DeclRefExpr(*Context, FD, false, FType, VK_PRValue, SourceLocation());
5274
5275	SmallVector<Expr*, 4> InitExprs;
5276
5277	// Initialize the block function.
5278	FD = SynthBlockInitFunctionDecl(name: Func);
5279	DeclRefExpr *Arg = new (Context) DeclRefExpr(
5280	*Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
5281	CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Context->VoidPtrTy,
5282	Kind: CK_BitCast, E: Arg);
5283	InitExprs.push_back(castExpr);
5284
5285	// Initialize the block descriptor.
5286	std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
5287
5288	VarDecl *NewVD = VarDecl::Create(
5289	C&: *Context, DC: TUDecl, StartLoc: SourceLocation(), IdLoc: SourceLocation(),
5290	Id: &Context->Idents.get(Name: DescData), T: Context->VoidPtrTy, TInfo: nullptr, S: SC_Static);
5291	UnaryOperator *DescRefExpr = UnaryOperator::Create(
5292	C: const_cast<ASTContext &>(*Context),
5293	input: new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
5294	VK_LValue, SourceLocation()),
5295	opc: UO_AddrOf, type: Context->getPointerType(Context->VoidPtrTy), VK: VK_PRValue,
5296	OK: OK_Ordinary, l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
5297	InitExprs.push_back(DescRefExpr);
5298
5299	// Add initializers for any closure decl refs.
5300	if (BlockDeclRefs.size()) {
5301	Expr *Exp;
5302	// Output all "by copy" declarations.
5303	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
5304	E = BlockByCopyDecls.end(); I != E; ++I) {
5305	if (isObjCType(T: (*I)->getType())) {
5306	// FIXME: Conform to ABI ([[obj retain] autorelease]).
5307	FD = SynthBlockInitFunctionDecl(name: (*I)->getName());
5308	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5309	VK_LValue, SourceLocation());
5310	if (HasLocalVariableExternalStorage(VD: *I)) {
5311	QualType QT = (*I)->getType();
5312	QT = Context->getPointerType(T: QT);
5313	Exp = UnaryOperator::Create(C: const_cast<ASTContext &>(*Context), input: Exp,
5314	opc: UO_AddrOf, type: QT, VK: VK_PRValue, OK: OK_Ordinary,
5315	l: SourceLocation(), CanOverflow: false,
5316	FPFeatures: FPOptionsOverride());
5317	}
5318	} else if (isTopLevelBlockPointerType(T: (*I)->getType())) {
5319	FD = SynthBlockInitFunctionDecl(name: (*I)->getName());
5320	Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5321	VK_LValue, SourceLocation());
5322	Exp = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: Context->VoidPtrTy,
5323	Kind: CK_BitCast, E: Arg);
5324	} else {
5325	FD = SynthBlockInitFunctionDecl(name: (*I)->getName());
5326	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5327	VK_LValue, SourceLocation());
5328	if (HasLocalVariableExternalStorage(VD: *I)) {
5329	QualType QT = (*I)->getType();
5330	QT = Context->getPointerType(T: QT);
5331	Exp = UnaryOperator::Create(C: const_cast<ASTContext &>(*Context), input: Exp,
5332	opc: UO_AddrOf, type: QT, VK: VK_PRValue, OK: OK_Ordinary,
5333	l: SourceLocation(), CanOverflow: false,
5334	FPFeatures: FPOptionsOverride());
5335	}
5336
5337	}
5338	InitExprs.push_back(Elt: Exp);
5339	}
5340	// Output all "by ref" declarations.
5341	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
5342	E = BlockByRefDecls.end(); I != E; ++I) {
5343	ValueDecl *ND = (*I);
5344	std::string Name(ND->getNameAsString());
5345	std::string RecName;
5346	RewriteByRefString(ResultStr&: RecName, Name, VD: ND, def: true);
5347	IdentifierInfo *II = &Context->Idents.get(Name: RecName.c_str()
5348	+ sizeof("struct"));
5349	RecordDecl *RD =
5350	RecordDecl::Create(*Context, TagTypeKind::Struct, TUDecl,
5351	SourceLocation(), SourceLocation(), II);
5352	assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
5353	QualType castT = Context->getPointerType(T: Context->getTagDeclType(RD));
5354
5355	FD = SynthBlockInitFunctionDecl(name: (*I)->getName());
5356	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5357	VK_LValue, SourceLocation());
5358	bool isNestedCapturedVar = false;
5359	for (const auto &CI : block->captures()) {
5360	const VarDecl *variable = CI.getVariable();
5361	if (variable == ND && CI.isNested()) {
5362	assert(CI.isByRef() &&
5363	"SynthBlockInitExpr - captured block variable is not byref");
5364	isNestedCapturedVar = true;
5365	break;
5366	}
5367	}
5368	// captured nested byref variable has its address passed. Do not take
5369	// its address again.
5370	if (!isNestedCapturedVar)
5371	Exp = UnaryOperator::Create(
5372	C: const_cast<ASTContext &>(*Context), input: Exp, opc: UO_AddrOf,
5373	type: Context->getPointerType(T: Exp->getType()), VK: VK_PRValue, OK: OK_Ordinary,
5374	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
5375	Exp = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: castT, Kind: CK_BitCast, E: Exp);
5376	InitExprs.push_back(Elt: Exp);
5377	}
5378	}
5379	if (ImportedBlockDecls.size()) {
5380	// generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
5381	int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
5382	unsigned IntSize =
5383	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5384	Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
5385	Context->IntTy, SourceLocation());
5386	InitExprs.push_back(Elt: FlagExp);
5387	}
5388	NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
5389	SourceLocation(), FPOptionsOverride());
5390
5391	if (GlobalBlockExpr) {
5392	assert (!GlobalConstructionExp &&
5393	"SynthBlockInitExpr - GlobalConstructionExp must be null");
5394	GlobalConstructionExp = NewRep;
5395	NewRep = DRE;
5396	}
5397
5398	NewRep = UnaryOperator::Create(
5399	C: const_cast<ASTContext &>(*Context), input: NewRep, opc: UO_AddrOf,
5400	type: Context->getPointerType(T: NewRep->getType()), VK: VK_PRValue, OK: OK_Ordinary,
5401	l: SourceLocation(), CanOverflow: false, FPFeatures: FPOptionsOverride());
5402	NewRep = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: FType, Kind: CK_BitCast,
5403	E: NewRep);
5404	// Put Paren around the call.
5405	NewRep = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
5406	NewRep);
5407
5408	BlockDeclRefs.clear();
5409	BlockByRefDecls.clear();
5410	BlockByRefDeclsPtrSet.clear();
5411	BlockByCopyDecls.clear();
5412	BlockByCopyDeclsPtrSet.clear();
5413	ImportedBlockDecls.clear();
5414	return NewRep;
5415	}
5416
5417	bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
5418	if (const ObjCForCollectionStmt * CS =
5419	dyn_cast<ObjCForCollectionStmt>(Val: Stmts.back()))
5420	return CS->getElement() == DS;
5421	return false;
5422	}
5423
5424	//===----------------------------------------------------------------------===//
5425	// Function Body / Expression rewriting
5426	//===----------------------------------------------------------------------===//
5427
5428	Stmt *RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
5429	if (isa<SwitchStmt>(Val: S) || isa<WhileStmt>(Val: S) ||
5430	isa<DoStmt>(Val: S) || isa<ForStmt>(Val: S))
5431	Stmts.push_back(Elt: S);
5432	else if (isa<ObjCForCollectionStmt>(Val: S)) {
5433	Stmts.push_back(Elt: S);
5434	ObjCBcLabelNo.push_back(Elt: ++BcLabelCount);
5435	}
5436
5437	// Pseudo-object operations and ivar references need special
5438	// treatment because we're going to recursively rewrite them.
5439	if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(Val: S)) {
5440	if (isa<BinaryOperator>(Val: PseudoOp->getSyntacticForm())) {
5441	return RewritePropertyOrImplicitSetter(PseudoOp);
5442	} else {
5443	return RewritePropertyOrImplicitGetter(PseudoOp);
5444	}
5445	} else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(Val: S)) {
5446	return RewriteObjCIvarRefExpr(IV: IvarRefExpr);
5447	}
5448	else if (isa<OpaqueValueExpr>(Val: S))
5449	S = cast<OpaqueValueExpr>(Val: S)->getSourceExpr();
5450
5451	SourceRange OrigStmtRange = S->getSourceRange();
5452
5453	// Perform a bottom up rewrite of all children.
5454	for (Stmt *&childStmt : S->children())
5455	if (childStmt) {
5456	Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(S: childStmt);
5457	if (newStmt) {
5458	childStmt = newStmt;
5459	}
5460	}
5461
5462	if (BlockExpr *BE = dyn_cast<BlockExpr>(Val: S)) {
5463	SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
5464	llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
5465	InnerContexts.insert(BE->getBlockDecl());
5466	ImportedLocalExternalDecls.clear();
5467	GetInnerBlockDeclRefExprs(S: BE->getBody(),
5468	InnerBlockDeclRefs, InnerContexts);
5469	// Rewrite the block body in place.
5470	Stmt *SaveCurrentBody = CurrentBody;
5471	CurrentBody = BE->getBody();
5472	PropParentMap = nullptr;
5473	// block literal on rhs of a property-dot-sytax assignment
5474	// must be replaced by its synthesize ast so getRewrittenText
5475	// works as expected. In this case, what actually ends up on RHS
5476	// is the blockTranscribed which is the helper function for the
5477	// block literal; as in: self.c = ^() {[ace ARR];};
5478	bool saveDisableReplaceStmt = DisableReplaceStmt;
5479	DisableReplaceStmt = false;
5480	RewriteFunctionBodyOrGlobalInitializer(S: BE->getBody());
5481	DisableReplaceStmt = saveDisableReplaceStmt;
5482	CurrentBody = SaveCurrentBody;
5483	PropParentMap = nullptr;
5484	ImportedLocalExternalDecls.clear();
5485	// Now we snarf the rewritten text and stash it away for later use.
5486	std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
5487	RewrittenBlockExprs[BE] = Str;
5488
5489	Stmt *blockTranscribed = SynthBlockInitExpr(Exp: BE, InnerBlockDeclRefs);
5490
5491	//blockTranscribed->dump();
5492	ReplaceStmt(Old: S, New: blockTranscribed);
5493	return blockTranscribed;
5494	}
5495	// Handle specific things.
5496	if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(Val: S))
5497	return RewriteAtEncode(Exp: AtEncode);
5498
5499	if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(Val: S))
5500	return RewriteAtSelector(Exp: AtSelector);
5501
5502	if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(Val: S))
5503	return RewriteObjCStringLiteral(Exp: AtString);
5504
5505	if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(Val: S))
5506	return RewriteObjCBoolLiteralExpr(Exp: BoolLitExpr);
5507
5508	if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(Val: S))
5509	return RewriteObjCBoxedExpr(Exp: BoxedExpr);
5510
5511	if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(Val: S))
5512	return RewriteObjCArrayLiteralExpr(Exp: ArrayLitExpr);
5513
5514	if (ObjCDictionaryLiteral *DictionaryLitExpr =
5515	dyn_cast<ObjCDictionaryLiteral>(Val: S))
5516	return RewriteObjCDictionaryLiteralExpr(Exp: DictionaryLitExpr);
5517
5518	if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(Val: S)) {
5519	#if 0
5520	// Before we rewrite it, put the original message expression in a comment.
5521	SourceLocation startLoc = MessExpr->getBeginLoc();
5522	SourceLocation endLoc = MessExpr->getEndLoc();
5523
5524	const char *startBuf = SM->getCharacterData(startLoc);
5525	const char *endBuf = SM->getCharacterData(endLoc);
5526
5527	std::string messString;
5528	messString += "// ";
5529	messString.append(startBuf, endBuf-startBuf+1);
5530	messString += "\n";
5531
5532	// FIXME: Missing definition of
5533	// InsertText(clang::SourceLocation, char const*, unsigned int).
5534	// InsertText(startLoc, messString);
5535	// Tried this, but it didn't work either...
5536	// ReplaceText(startLoc, 0, messString.c_str(), messString.size());
5537	#endif
5538	return RewriteMessageExpr(Exp: MessExpr);
5539	}
5540
5541	if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
5542	dyn_cast<ObjCAutoreleasePoolStmt>(Val: S)) {
5543	return RewriteObjCAutoreleasePoolStmt(S: StmtAutoRelease);
5544	}
5545
5546	if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(Val: S))
5547	return RewriteObjCTryStmt(S: StmtTry);
5548
5549	if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(Val: S))
5550	return RewriteObjCSynchronizedStmt(S: StmtTry);
5551
5552	if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(Val: S))
5553	return RewriteObjCThrowStmt(S: StmtThrow);
5554
5555	if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(Val: S))
5556	return RewriteObjCProtocolExpr(Exp: ProtocolExp);
5557
5558	if (ObjCForCollectionStmt *StmtForCollection =
5559	dyn_cast<ObjCForCollectionStmt>(Val: S))
5560	return RewriteObjCForCollectionStmt(S: StmtForCollection,
5561	OrigEnd: OrigStmtRange.getEnd());
5562	if (BreakStmt *StmtBreakStmt =
5563	dyn_cast<BreakStmt>(Val: S))
5564	return RewriteBreakStmt(S: StmtBreakStmt);
5565	if (ContinueStmt *StmtContinueStmt =
5566	dyn_cast<ContinueStmt>(Val: S))
5567	return RewriteContinueStmt(S: StmtContinueStmt);
5568
5569	// Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
5570	// and cast exprs.
5571	if (DeclStmt *DS = dyn_cast<DeclStmt>(Val: S)) {
5572	// FIXME: What we're doing here is modifying the type-specifier that
5573	// precedes the first Decl. In the future the DeclGroup should have
5574	// a separate type-specifier that we can rewrite.
5575	// NOTE: We need to avoid rewriting the DeclStmt if it is within
5576	// the context of an ObjCForCollectionStmt. For example:
5577	// NSArray *someArray;
5578	// for (id <FooProtocol> index in someArray) ;
5579	// This is because RewriteObjCForCollectionStmt() does textual rewriting
5580	// and it depends on the original text locations/positions.
5581	if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
5582	RewriteObjCQualifiedInterfaceTypes(Dcl: *DS->decl_begin());
5583
5584	// Blocks rewrite rules.
5585	for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
5586	DI != DE; ++DI) {
5587	Decl *SD = *DI;
5588	if (ValueDecl *ND = dyn_cast<ValueDecl>(Val: SD)) {
5589	if (isTopLevelBlockPointerType(T: ND->getType()))
5590	RewriteBlockPointerDecl(ND);
5591	else if (ND->getType()->isFunctionPointerType())
5592	CheckFunctionPointerDecl(ND->getType(), ND);
5593	if (VarDecl *VD = dyn_cast<VarDecl>(Val: SD)) {
5594	if (VD->hasAttr<BlocksAttr>()) {
5595	static unsigned uniqueByrefDeclCount = 0;
5596	assert(!BlockByRefDeclNo.count(ND) &&
5597	"RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
5598	BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
5599	RewriteByRefVar(ND: VD, firstDecl: (DI == DS->decl_begin()), lastDecl: ((DI+1) == DE));
5600	}
5601	else
5602	RewriteTypeOfDecl(ND: VD);
5603	}
5604	}
5605	if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Val: SD)) {
5606	if (isTopLevelBlockPointerType(T: TD->getUnderlyingType()))
5607	RewriteBlockPointerDecl(TD);
5608	else if (TD->getUnderlyingType()->isFunctionPointerType())
5609	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5610	}
5611	}
5612	}
5613
5614	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: S))
5615	RewriteObjCQualifiedInterfaceTypes(CE);
5616
5617	if (isa<SwitchStmt>(Val: S) || isa<WhileStmt>(Val: S) ||
5618	isa<DoStmt>(Val: S) || isa<ForStmt>(Val: S)) {
5619	assert(!Stmts.empty() && "Statement stack is empty");
5620	assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
5621	isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
5622	&& "Statement stack mismatch");
5623	Stmts.pop_back();
5624	}
5625	// Handle blocks rewriting.
5626	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Val: S)) {
5627	ValueDecl *VD = DRE->getDecl();
5628	if (VD->hasAttr<BlocksAttr>())
5629	return RewriteBlockDeclRefExpr(DeclRefExp: DRE);
5630	if (HasLocalVariableExternalStorage(VD))
5631	return RewriteLocalVariableExternalStorage(DRE);
5632	}
5633
5634	if (CallExpr *CE = dyn_cast<CallExpr>(Val: S)) {
5635	if (CE->getCallee()->getType()->isBlockPointerType()) {
5636	Stmt *BlockCall = SynthesizeBlockCall(Exp: CE, BlockExp: CE->getCallee());
5637	ReplaceStmt(Old: S, New: BlockCall);
5638	return BlockCall;
5639	}
5640	}
5641	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: S)) {
5642	RewriteCastExpr(CE);
5643	}
5644	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Val: S)) {
5645	RewriteImplicitCastObjCExpr(ICE);
5646	}
5647	#if 0
5648
5649	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5650	CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
5651	ICE->getSubExpr(),
5652	SourceLocation());
5653	// Get the new text.
5654	std::string SStr;
5655	llvm::raw_string_ostream Buf(SStr);
5656	Replacement->printPretty(Buf);
5657	const std::string &Str = Buf.str();
5658
5659	printf("CAST = %s\n", &Str[0]);
5660	InsertText(ICE->getSubExpr()->getBeginLoc(), Str);
5661	delete S;
5662	return Replacement;
5663	}
5664	#endif
5665	// Return this stmt unmodified.
5666	return S;
5667	}
5668
5669	void RewriteModernObjC::RewriteRecordBody(RecordDecl *RD) {
5670	for (auto *FD : RD->fields()) {
5671	if (isTopLevelBlockPointerType(T: FD->getType()))
5672	RewriteBlockPointerDecl(FD);
5673	if (FD->getType()->isObjCQualifiedIdType() ||
5674	FD->getType()->isObjCQualifiedInterfaceType())
5675	RewriteObjCQualifiedInterfaceTypes(FD);
5676	}
5677	}
5678
5679	/// HandleDeclInMainFile - This is called for each top-level decl defined in the
5680	/// main file of the input.
5681	void RewriteModernObjC::HandleDeclInMainFile(Decl *D) {
5682	switch (D->getKind()) {
5683	case Decl::Function: {
5684	FunctionDecl *FD = cast<FunctionDecl>(Val: D);
5685	if (FD->isOverloadedOperator())
5686	return;
5687
5688	// Since function prototypes don't have ParmDecl's, we check the function
5689	// prototype. This enables us to rewrite function declarations and
5690	// definitions using the same code.
5691	RewriteBlocksInFunctionProtoType(funcType: FD->getType(), D: FD);
5692
5693	if (!FD->isThisDeclarationADefinition())
5694	break;
5695
5696	// FIXME: If this should support Obj-C++, support CXXTryStmt
5697	if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(Val: FD->getBody())) {
5698	CurFunctionDef = FD;
5699	CurrentBody = Body;
5700	Body =
5701	cast_or_null<CompoundStmt>(Val: RewriteFunctionBodyOrGlobalInitializer(Body));
5702	FD->setBody(Body);
5703	CurrentBody = nullptr;
5704	if (PropParentMap) {
5705	delete PropParentMap;
5706	PropParentMap = nullptr;
5707	}
5708	// This synthesizes and inserts the block "impl" struct, invoke function,
5709	// and any copy/dispose helper functions.
5710	InsertBlockLiteralsWithinFunction(FD);
5711	RewriteLineDirective(D);
5712	CurFunctionDef = nullptr;
5713	}
5714	break;
5715	}
5716	case Decl::ObjCMethod: {
5717	ObjCMethodDecl *MD = cast<ObjCMethodDecl>(Val: D);
5718	if (CompoundStmt *Body = MD->getCompoundBody()) {
5719	CurMethodDef = MD;
5720	CurrentBody = Body;
5721	Body =
5722	cast_or_null<CompoundStmt>(Val: RewriteFunctionBodyOrGlobalInitializer(Body));
5723	MD->setBody(Body);
5724	CurrentBody = nullptr;
5725	if (PropParentMap) {
5726	delete PropParentMap;
5727	PropParentMap = nullptr;
5728	}
5729	InsertBlockLiteralsWithinMethod(MD);
5730	RewriteLineDirective(D);
5731	CurMethodDef = nullptr;
5732	}
5733	break;
5734	}
5735	case Decl::ObjCImplementation: {
5736	ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(Val: D);
5737	ClassImplementation.push_back(Elt: CI);
5738	break;
5739	}
5740	case Decl::ObjCCategoryImpl: {
5741	ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(Val: D);
5742	CategoryImplementation.push_back(Elt: CI);
5743	break;
5744	}
5745	case Decl::Var: {
5746	VarDecl *VD = cast<VarDecl>(Val: D);
5747	RewriteObjCQualifiedInterfaceTypes(VD);
5748	if (isTopLevelBlockPointerType(T: VD->getType()))
5749	RewriteBlockPointerDecl(VD);
5750	else if (VD->getType()->isFunctionPointerType()) {
5751	CheckFunctionPointerDecl(funcType: VD->getType(), ND: VD);
5752	if (VD->getInit()) {
5753	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: VD->getInit())) {
5754	RewriteCastExpr(CE);
5755	}
5756	}
5757	} else if (VD->getType()->isRecordType()) {
5758	RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();
5759	if (RD->isCompleteDefinition())
5760	RewriteRecordBody(RD);
5761	}
5762	if (VD->getInit()) {
5763	GlobalVarDecl = VD;
5764	CurrentBody = VD->getInit();
5765	RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
5766	CurrentBody = nullptr;
5767	if (PropParentMap) {
5768	delete PropParentMap;
5769	PropParentMap = nullptr;
5770	}
5771	SynthesizeBlockLiterals(FunLocStart: VD->getTypeSpecStartLoc(), FunName: VD->getName());
5772	GlobalVarDecl = nullptr;
5773
5774	// This is needed for blocks.
5775	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(Val: VD->getInit())) {
5776	RewriteCastExpr(CE);
5777	}
5778	}
5779	break;
5780	}
5781	case Decl::TypeAlias:
5782	case Decl::Typedef: {
5783	if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Val: D)) {
5784	if (isTopLevelBlockPointerType(T: TD->getUnderlyingType()))
5785	RewriteBlockPointerDecl(TD);
5786	else if (TD->getUnderlyingType()->isFunctionPointerType())
5787	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5788	else
5789	RewriteObjCQualifiedInterfaceTypes(TD);
5790	}
5791	break;
5792	}
5793	case Decl::CXXRecord:
5794	case Decl::Record: {
5795	RecordDecl *RD = cast<RecordDecl>(Val: D);
5796	if (RD->isCompleteDefinition())
5797	RewriteRecordBody(RD);
5798	break;
5799	}
5800	default:
5801	break;
5802	}
5803	// Nothing yet.
5804	}
5805
5806	/// Write_ProtocolExprReferencedMetadata - This routine writer out the
5807	/// protocol reference symbols in the for of:
5808	/// struct _protocol_t *PROTOCOL_REF = &PROTOCOL_METADATA.
5809	static void Write_ProtocolExprReferencedMetadata(ASTContext *Context,
5810	ObjCProtocolDecl *PDecl,
5811	std::string &Result) {
5812	// Also output .objc_protorefs$B section and its meta-data.
5813	if (Context->getLangOpts().MicrosoftExt)
5814	Result += "static ";
5815	Result += "struct _protocol_t *";
5816	Result += "_OBJC_PROTOCOL_REFERENCE_$_";
5817	Result += PDecl->getNameAsString();
5818	Result += " = &";
5819	Result += "_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
5820	Result += ";\n";
5821	}
5822
5823	void RewriteModernObjC::HandleTranslationUnit(ASTContext &C) {
5824	if (Diags.hasErrorOccurred())
5825	return;
5826
5827	RewriteInclude();
5828
5829	for (unsigned i = 0, e = FunctionDefinitionsSeen.size(); i < e; i++) {
5830	// translation of function bodies were postponed until all class and
5831	// their extensions and implementations are seen. This is because, we
5832	// cannot build grouping structs for bitfields until they are all seen.
5833	FunctionDecl *FDecl = FunctionDefinitionsSeen[i];
5834	HandleTopLevelSingleDecl(FDecl);
5835	}
5836
5837	// Here's a great place to add any extra declarations that may be needed.
5838	// Write out meta data for each @protocol(<expr>).
5839	for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
5840	RewriteObjCProtocolMetaData(Protocol: ProtDecl, Result&: Preamble);
5841	Write_ProtocolExprReferencedMetadata(Context, PDecl: ProtDecl, Result&: Preamble);
5842	}
5843
5844	InsertText(Loc: SM->getLocForStartOfFile(FID: MainFileID), Str: Preamble, InsertAfter: false);
5845
5846	if (ClassImplementation.size() || CategoryImplementation.size())
5847	RewriteImplementations();
5848
5849	for (unsigned i = 0, e = ObjCInterfacesSeen.size(); i < e; i++) {
5850	ObjCInterfaceDecl *CDecl = ObjCInterfacesSeen[i];
5851	// Write struct declaration for the class matching its ivar declarations.
5852	// Note that for modern abi, this is postponed until the end of TU
5853	// because class extensions and the implementation might declare their own
5854	// private ivars.
5855	RewriteInterfaceDecl(ClassDecl: CDecl);
5856	}
5857
5858	// Get the buffer corresponding to MainFileID. If we haven't changed it, then
5859	// we are done.
5860	if (const RewriteBuffer *RewriteBuf =
5861	Rewrite.getRewriteBufferFor(FID: MainFileID)) {
5862	//printf("Changed:\n");
5863	*OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
5864	} else {
5865	llvm::errs() << "No changes\n";
5866	}
5867
5868	if (ClassImplementation.size() || CategoryImplementation.size() ||
5869	ProtocolExprDecls.size()) {
5870	// Rewrite Objective-c meta data*
5871	std::string ResultStr;
5872	RewriteMetaDataIntoBuffer(Result&: ResultStr);
5873	// Emit metadata.
5874	*OutFile << ResultStr;
5875	}
5876	// Emit ImageInfo;
5877	{
5878	std::string ResultStr;
5879	WriteImageInfo(Result&: ResultStr);
5880	*OutFile << ResultStr;
5881	}
5882	OutFile->flush();
5883	}
5884
5885	void RewriteModernObjC::Initialize(ASTContext &context) {
5886	InitializeCommon(context);
5887
5888	Preamble += "#ifndef __OBJC2__\n";
5889	Preamble += "#define __OBJC2__\n";
5890	Preamble += "#endif\n";
5891
5892	// declaring objc_selector outside the parameter list removes a silly
5893	// scope related warning...
5894	if (IsHeader)
5895	Preamble = "#pragma once\n";
5896	Preamble += "struct objc_selector; struct objc_class;\n";
5897	Preamble += "struct __rw_objc_super { \n\tstruct objc_object *object; ";
5898	Preamble += "\n\tstruct objc_object *superClass; ";
5899	// Add a constructor for creating temporary objects.
5900	Preamble += "\n\t__rw_objc_super(struct objc_object *o, struct objc_object *s) ";
5901	Preamble += ": object(o), superClass(s) {} ";
5902	Preamble += "\n};\n";
5903
5904	if (LangOpts.MicrosoftExt) {
5905	// Define all sections using syntax that makes sense.
5906	// These are currently generated.
5907	Preamble += "\n#pragma section(\".objc_classlist$B\", long, read, write)\n";
5908	Preamble += "#pragma section(\".objc_catlist$B\", long, read, write)\n";
5909	Preamble += "#pragma section(\".objc_imageinfo$B\", long, read, write)\n";
5910	Preamble += "#pragma section(\".objc_nlclslist$B\", long, read, write)\n";
5911	Preamble += "#pragma section(\".objc_nlcatlist$B\", long, read, write)\n";
5912	// These are generated but not necessary for functionality.
5913	Preamble += "#pragma section(\".cat_cls_meth$B\", long, read, write)\n";
5914	Preamble += "#pragma section(\".inst_meth$B\", long, read, write)\n";
5915	Preamble += "#pragma section(\".cls_meth$B\", long, read, write)\n";
5916	Preamble += "#pragma section(\".objc_ivar$B\", long, read, write)\n";
5917
5918	// These need be generated for performance. Currently they are not,
5919	// using API calls instead.
5920	Preamble += "#pragma section(\".objc_selrefs$B\", long, read, write)\n";
5921	Preamble += "#pragma section(\".objc_classrefs$B\", long, read, write)\n";
5922	Preamble += "#pragma section(\".objc_superrefs$B\", long, read, write)\n";
5923
5924	}
5925	Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
5926	Preamble += "typedef struct objc_object Protocol;\n";
5927	Preamble += "#define _REWRITER_typedef_Protocol\n";
5928	Preamble += "#endif\n";
5929	if (LangOpts.MicrosoftExt) {
5930	Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
5931	Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
5932	}
5933	else
5934	Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
5935
5936	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend(void);\n";
5937	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper(void);\n";
5938	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_stret(void);\n";
5939	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper_stret(void);\n";
5940	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_fpret(void);\n";
5941
5942	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getClass";
5943	Preamble += "(const char *);\n";
5944	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
5945	Preamble += "(struct objc_class *);\n";
5946	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getMetaClass";
5947	Preamble += "(const char *);\n";
5948	Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw( struct objc_object *);\n";
5949	// @synchronized hooks.
5950	Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter( struct objc_object *);\n";
5951	Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit( struct objc_object *);\n";
5952	Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
5953	Preamble += "#ifdef _WIN64\n";
5954	Preamble += "typedef unsigned long long _WIN_NSUInteger;\n";
5955	Preamble += "#else\n";
5956	Preamble += "typedef unsigned int _WIN_NSUInteger;\n";
5957	Preamble += "#endif\n";
5958	Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
5959	Preamble += "struct __objcFastEnumerationState {\n\t";
5960	Preamble += "unsigned long state;\n\t";
5961	Preamble += "void **itemsPtr;\n\t";
5962	Preamble += "unsigned long *mutationsPtr;\n\t";
5963	Preamble += "unsigned long extra[5];\n};\n";
5964	Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
5965	Preamble += "#define __FASTENUMERATIONSTATE\n";
5966	Preamble += "#endif\n";
5967	Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
5968	Preamble += "struct __NSConstantStringImpl {\n";
5969	Preamble += " int *isa;\n";
5970	Preamble += " int flags;\n";
5971	Preamble += " char *str;\n";
5972	Preamble += "#if _WIN64\n";
5973	Preamble += " long long length;\n";
5974	Preamble += "#else\n";
5975	Preamble += " long length;\n";
5976	Preamble += "#endif\n";
5977	Preamble += "};\n";
5978	Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
5979	Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
5980	Preamble += "#else\n";
5981	Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
5982	Preamble += "#endif\n";
5983	Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
5984	Preamble += "#endif\n";
5985	// Blocks preamble.
5986	Preamble += "#ifndef BLOCK_IMPL\n";
5987	Preamble += "#define BLOCK_IMPL\n";
5988	Preamble += "struct __block_impl {\n";
5989	Preamble += " void *isa;\n";
5990	Preamble += " int Flags;\n";
5991	Preamble += " int Reserved;\n";
5992	Preamble += " void *FuncPtr;\n";
5993	Preamble += "};\n";
5994	Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
5995	Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
5996	Preamble += "extern \"C\" __declspec(dllexport) "
5997	"void _Block_object_assign(void *, const void *, const int);\n";
5998	Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
5999	Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
6000	Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
6001	Preamble += "#else\n";
6002	Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
6003	Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
6004	Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
6005	Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
6006	Preamble += "#endif\n";
6007	Preamble += "#endif\n";
6008	if (LangOpts.MicrosoftExt) {
6009	Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
6010	Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
6011	Preamble += "#ifndef KEEP_ATTRIBUTES\n"; // We use this for clang tests.
6012	Preamble += "#define __attribute__(X)\n";
6013	Preamble += "#endif\n";
6014	Preamble += "#ifndef __weak\n";
6015	Preamble += "#define __weak\n";
6016	Preamble += "#endif\n";
6017	Preamble += "#ifndef __block\n";
6018	Preamble += "#define __block\n";
6019	Preamble += "#endif\n";
6020	}
6021	else {
6022	Preamble += "#define __block\n";
6023	Preamble += "#define __weak\n";
6024	}
6025
6026	// Declarations required for modern objective-c array and dictionary literals.
6027	Preamble += "\n#include <stdarg.h>\n";
6028	Preamble += "struct __NSContainer_literal {\n";
6029	Preamble += " void * *arr;\n";
6030	Preamble += " __NSContainer_literal (unsigned int count, ...) {\n";
6031	Preamble += "\tva_list marker;\n";
6032	Preamble += "\tva_start(marker, count);\n";
6033	Preamble += "\tarr = new void *[count];\n";
6034	Preamble += "\tfor (unsigned i = 0; i < count; i++)\n";
6035	Preamble += "\t arr[i] = va_arg(marker, void *);\n";
6036	Preamble += "\tva_end( marker );\n";
6037	Preamble += " };\n";
6038	Preamble += " ~__NSContainer_literal() {\n";
6039	Preamble += "\tdelete[] arr;\n";
6040	Preamble += " }\n";
6041	Preamble += "};\n";
6042
6043	// Declaration required for implementation of @autoreleasepool statement.
6044	Preamble += "extern \"C\" __declspec(dllimport) void * objc_autoreleasePoolPush(void);\n";
6045	Preamble += "extern \"C\" __declspec(dllimport) void objc_autoreleasePoolPop(void *);\n\n";
6046	Preamble += "struct __AtAutoreleasePool {\n";
6047	Preamble += " __AtAutoreleasePool() {atautoreleasepoolobj = objc_autoreleasePoolPush();}\n";
6048	Preamble += " ~__AtAutoreleasePool() {objc_autoreleasePoolPop(atautoreleasepoolobj);}\n";
6049	Preamble += " void * atautoreleasepoolobj;\n";
6050	Preamble += "};\n";
6051
6052	// NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
6053	// as this avoids warning in any 64bit/32bit compilation model.
6054	Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
6055	}
6056
6057	/// RewriteIvarOffsetComputation - This routine synthesizes computation of
6058	/// ivar offset.
6059	void RewriteModernObjC::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
6060	std::string &Result) {
6061	Result += "__OFFSETOFIVAR__(struct ";
6062	Result += ivar->getContainingInterface()->getNameAsString();
6063	if (LangOpts.MicrosoftExt)
6064	Result += "_IMPL";
6065	Result += ", ";
6066	if (ivar->isBitField())
6067	ObjCIvarBitfieldGroupDecl(IV: ivar, Result);
6068	else
6069	Result += ivar->getNameAsString();
6070	Result += ")";
6071	}
6072
6073	/// WriteModernMetadataDeclarations - Writes out metadata declarations for modern ABI.
6074	/// struct _prop_t {
6075	/// const char *name;
6076	/// char *attributes;
6077	/// }
6078
6079	/// struct _prop_list_t {
6080	/// uint32_t entsize; // sizeof(struct _prop_t)
6081	/// uint32_t count_of_properties;
6082	/// struct _prop_t prop_list[count_of_properties];
6083	/// }
6084
6085	/// struct _protocol_t;
6086
6087	/// struct _protocol_list_t {
6088	/// long protocol_count; // Note, this is 32/64 bit
6089	/// struct _protocol_t * protocol_list[protocol_count];
6090	/// }
6091
6092	/// struct _objc_method {
6093	/// SEL _cmd;
6094	/// const char *method_type;
6095	/// char *_imp;
6096	/// }
6097
6098	/// struct _method_list_t {
6099	/// uint32_t entsize; // sizeof(struct _objc_method)
6100	/// uint32_t method_count;
6101	/// struct _objc_method method_list[method_count];
6102	/// }
6103
6104	/// struct _protocol_t {
6105	/// id isa; // NULL
6106	/// const char *protocol_name;
6107	/// const struct _protocol_list_t * protocol_list; // super protocols
6108	/// const struct method_list_t *instance_methods;
6109	/// const struct method_list_t *class_methods;
6110	/// const struct method_list_t *optionalInstanceMethods;
6111	/// const struct method_list_t *optionalClassMethods;
6112	/// const struct _prop_list_t * properties;
6113	/// const uint32_t size; // sizeof(struct _protocol_t)
6114	/// const uint32_t flags; // = 0
6115	/// const char ** extendedMethodTypes;
6116	/// }
6117
6118	/// struct _ivar_t {
6119	/// unsigned long int *offset; // pointer to ivar offset location
6120	/// const char *name;
6121	/// const char *type;
6122	/// uint32_t alignment;
6123	/// uint32_t size;
6124	/// }
6125
6126	/// struct _ivar_list_t {
6127	/// uint32 entsize; // sizeof(struct _ivar_t)
6128	/// uint32 count;
6129	/// struct _ivar_t list[count];
6130	/// }
6131
6132	/// struct _class_ro_t {
6133	/// uint32_t flags;
6134	/// uint32_t instanceStart;
6135	/// uint32_t instanceSize;
6136	/// uint32_t reserved; // only when building for 64bit targets
6137	/// const uint8_t *ivarLayout;
6138	/// const char *name;
6139	/// const struct _method_list_t *baseMethods;
6140	/// const struct _protocol_list_t *baseProtocols;
6141	/// const struct _ivar_list_t *ivars;
6142	/// const uint8_t *weakIvarLayout;
6143	/// const struct _prop_list_t *properties;
6144	/// }
6145
6146	/// struct _class_t {
6147	/// struct _class_t *isa;
6148	/// struct _class_t *superclass;
6149	/// void *cache;
6150	/// IMP *vtable;
6151	/// struct _class_ro_t *ro;
6152	/// }
6153
6154	/// struct _category_t {
6155	/// const char *name;
6156	/// struct _class_t *cls;
6157	/// const struct _method_list_t *instance_methods;
6158	/// const struct _method_list_t *class_methods;
6159	/// const struct _protocol_list_t *protocols;
6160	/// const struct _prop_list_t *properties;
6161	/// }
6162
6163	/// MessageRefTy - LLVM for:
6164	/// struct _message_ref_t {
6165	/// IMP messenger;
6166	/// SEL name;
6167	/// };
6168
6169	/// SuperMessageRefTy - LLVM for:
6170	/// struct _super_message_ref_t {
6171	/// SUPER_IMP messenger;
6172	/// SEL name;
6173	/// };
6174
6175	static void WriteModernMetadataDeclarations(ASTContext *Context, std::string &Result) {
6176	static bool meta_data_declared = false;
6177	if (meta_data_declared)
6178	return;
6179
6180	Result += "\nstruct _prop_t {\n";
6181	Result += "\tconst char *name;\n";
6182	Result += "\tconst char *attributes;\n";
6183	Result += "};\n";
6184
6185	Result += "\nstruct _protocol_t;\n";
6186
6187	Result += "\nstruct _objc_method {\n";
6188	Result += "\tstruct objc_selector * _cmd;\n";
6189	Result += "\tconst char *method_type;\n";
6190	Result += "\tvoid *_imp;\n";
6191	Result += "};\n";
6192
6193	Result += "\nstruct _protocol_t {\n";
6194	Result += "\tvoid * isa; // NULL\n";
6195	Result += "\tconst char *protocol_name;\n";
6196	Result += "\tconst struct _protocol_list_t * protocol_list; // super protocols\n";
6197	Result += "\tconst struct method_list_t *instance_methods;\n";
6198	Result += "\tconst struct method_list_t *class_methods;\n";
6199	Result += "\tconst struct method_list_t *optionalInstanceMethods;\n";
6200	Result += "\tconst struct method_list_t *optionalClassMethods;\n";
6201	Result += "\tconst struct _prop_list_t * properties;\n";
6202	Result += "\tconst unsigned int size; // sizeof(struct _protocol_t)\n";
6203	Result += "\tconst unsigned int flags; // = 0\n";
6204	Result += "\tconst char ** extendedMethodTypes;\n";
6205	Result += "};\n";
6206
6207	Result += "\nstruct _ivar_t {\n";
6208	Result += "\tunsigned long int *offset; // pointer to ivar offset location\n";
6209	Result += "\tconst char *name;\n";
6210	Result += "\tconst char *type;\n";
6211	Result += "\tunsigned int alignment;\n";
6212	Result += "\tunsigned int size;\n";
6213	Result += "};\n";
6214
6215	Result += "\nstruct _class_ro_t {\n";
6216	Result += "\tunsigned int flags;\n";
6217	Result += "\tunsigned int instanceStart;\n";
6218	Result += "\tunsigned int instanceSize;\n";
6219	const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6220	if (Triple.getArch() == llvm::Triple::x86_64)
6221	Result += "\tunsigned int reserved;\n";
6222	Result += "\tconst unsigned char *ivarLayout;\n";
6223	Result += "\tconst char *name;\n";
6224	Result += "\tconst struct _method_list_t *baseMethods;\n";
6225	Result += "\tconst struct _objc_protocol_list *baseProtocols;\n";
6226	Result += "\tconst struct _ivar_list_t *ivars;\n";
6227	Result += "\tconst unsigned char *weakIvarLayout;\n";
6228	Result += "\tconst struct _prop_list_t *properties;\n";
6229	Result += "};\n";
6230
6231	Result += "\nstruct _class_t {\n";
6232	Result += "\tstruct _class_t *isa;\n";
6233	Result += "\tstruct _class_t *superclass;\n";
6234	Result += "\tvoid *cache;\n";
6235	Result += "\tvoid *vtable;\n";
6236	Result += "\tstruct _class_ro_t *ro;\n";
6237	Result += "};\n";
6238
6239	Result += "\nstruct _category_t {\n";
6240	Result += "\tconst char *name;\n";
6241	Result += "\tstruct _class_t *cls;\n";
6242	Result += "\tconst struct _method_list_t *instance_methods;\n";
6243	Result += "\tconst struct _method_list_t *class_methods;\n";
6244	Result += "\tconst struct _protocol_list_t *protocols;\n";
6245	Result += "\tconst struct _prop_list_t *properties;\n";
6246	Result += "};\n";
6247
6248	Result += "extern \"C\" __declspec(dllimport) struct objc_cache _objc_empty_cache;\n";
6249	Result += "#pragma warning(disable:4273)\n";
6250	meta_data_declared = true;
6251	}
6252
6253	static void Write_protocol_list_t_TypeDecl(std::string &Result,
6254	long super_protocol_count) {
6255	Result += "struct /*_protocol_list_t*/"; Result += " {\n";
6256	Result += "\tlong protocol_count; // Note, this is 32/64 bit\n";
6257	Result += "\tstruct _protocol_t *super_protocols[";
6258	Result += utostr(X: super_protocol_count); Result += "];\n";
6259	Result += "}";
6260	}
6261
6262	static void Write_method_list_t_TypeDecl(std::string &Result,
6263	unsigned int method_count) {
6264	Result += "struct /*_method_list_t*/"; Result += " {\n";
6265	Result += "\tunsigned int entsize; // sizeof(struct _objc_method)\n";
6266	Result += "\tunsigned int method_count;\n";
6267	Result += "\tstruct _objc_method method_list[";
6268	Result += utostr(X: method_count); Result += "];\n";
6269	Result += "}";
6270	}
6271
6272	static void Write__prop_list_t_TypeDecl(std::string &Result,
6273	unsigned int property_count) {
6274	Result += "struct /*_prop_list_t*/"; Result += " {\n";
6275	Result += "\tunsigned int entsize; // sizeof(struct _prop_t)\n";
6276	Result += "\tunsigned int count_of_properties;\n";
6277	Result += "\tstruct _prop_t prop_list[";
6278	Result += utostr(X: property_count); Result += "];\n";
6279	Result += "}";
6280	}
6281
6282	static void Write__ivar_list_t_TypeDecl(std::string &Result,
6283	unsigned int ivar_count) {
6284	Result += "struct /*_ivar_list_t*/"; Result += " {\n";
6285	Result += "\tunsigned int entsize; // sizeof(struct _prop_t)\n";
6286	Result += "\tunsigned int count;\n";
6287	Result += "\tstruct _ivar_t ivar_list[";
6288	Result += utostr(X: ivar_count); Result += "];\n";
6289	Result += "}";
6290	}
6291
6292	static void Write_protocol_list_initializer(ASTContext *Context, std::string &Result,
6293	ArrayRef<ObjCProtocolDecl *> SuperProtocols,
6294	StringRef VarName,
6295	StringRef ProtocolName) {
6296	if (SuperProtocols.size() > 0) {
6297	Result += "\nstatic ";
6298	Write_protocol_list_t_TypeDecl(Result, super_protocol_count: SuperProtocols.size());
6299	Result += " "; Result += VarName;
6300	Result += ProtocolName;
6301	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6302	Result += "\t"; Result += utostr(X: SuperProtocols.size()); Result += ",\n";
6303	for (unsigned i = 0, e = SuperProtocols.size(); i < e; i++) {
6304	ObjCProtocolDecl *SuperPD = SuperProtocols[i];
6305	Result += "\t&"; Result += "_OBJC_PROTOCOL_";
6306	Result += SuperPD->getNameAsString();
6307	if (i == e-1)
6308	Result += "\n};\n";
6309	else
6310	Result += ",\n";
6311	}
6312	}
6313	}
6314
6315	static void Write_method_list_t_initializer(RewriteModernObjC &RewriteObj,
6316	ASTContext *Context, std::string &Result,
6317	ArrayRef<ObjCMethodDecl *> Methods,
6318	StringRef VarName,
6319	StringRef TopLevelDeclName,
6320	bool MethodImpl) {
6321	if (Methods.size() > 0) {
6322	Result += "\nstatic ";
6323	Write_method_list_t_TypeDecl(Result, method_count: Methods.size());
6324	Result += " "; Result += VarName;
6325	Result += TopLevelDeclName;
6326	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6327	Result += "\t"; Result += "sizeof(_objc_method)"; Result += ",\n";
6328	Result += "\t"; Result += utostr(X: Methods.size()); Result += ",\n";
6329	for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6330	ObjCMethodDecl *MD = Methods[i];
6331	if (i == 0)
6332	Result += "\t{{(struct objc_selector *)\"";
6333	else
6334	Result += "\t{(struct objc_selector *)\"";
6335	Result += (MD)->getSelector().getAsString(); Result += "\"";
6336	Result += ", ";
6337	std::string MethodTypeString = Context->getObjCEncodingForMethodDecl(Decl: MD);
6338	Result += "\""; Result += MethodTypeString; Result += "\"";
6339	Result += ", ";
6340	if (!MethodImpl)
6341	Result += "0";
6342	else {
6343	Result += "(void *)";
6344	Result += RewriteObj.MethodInternalNames[MD];
6345	}
6346	if (i == e-1)
6347	Result += "}}\n";
6348	else
6349	Result += "},\n";
6350	}
6351	Result += "};\n";
6352	}
6353	}
6354
6355	static void Write_prop_list_t_initializer(RewriteModernObjC &RewriteObj,
6356	ASTContext *Context, std::string &Result,
6357	ArrayRef<ObjCPropertyDecl *> Properties,
6358	const Decl *Container,
6359	StringRef VarName,
6360	StringRef ProtocolName) {
6361	if (Properties.size() > 0) {
6362	Result += "\nstatic ";
6363	Write__prop_list_t_TypeDecl(Result, property_count: Properties.size());
6364	Result += " "; Result += VarName;
6365	Result += ProtocolName;
6366	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6367	Result += "\t"; Result += "sizeof(_prop_t)"; Result += ",\n";
6368	Result += "\t"; Result += utostr(X: Properties.size()); Result += ",\n";
6369	for (unsigned i = 0, e = Properties.size(); i < e; i++) {
6370	ObjCPropertyDecl *PropDecl = Properties[i];
6371	if (i == 0)
6372	Result += "\t{{\"";
6373	else
6374	Result += "\t{\"";
6375	Result += PropDecl->getName(); Result += "\",";
6376	std::string PropertyTypeString =
6377	Context->getObjCEncodingForPropertyDecl(PD: PropDecl, Container);
6378	std::string QuotePropertyTypeString;
6379	RewriteObj.QuoteDoublequotes(From&: PropertyTypeString, To&: QuotePropertyTypeString);
6380	Result += "\""; Result += QuotePropertyTypeString; Result += "\"";
6381	if (i == e-1)
6382	Result += "}}\n";
6383	else
6384	Result += "},\n";
6385	}
6386	Result += "};\n";
6387	}
6388	}
6389
6390	// Metadata flags
6391	enum MetaDataDlags {
6392	CLS = 0x0,
6393	CLS_META = 0x1,
6394	CLS_ROOT = 0x2,
6395	OBJC2_CLS_HIDDEN = 0x10,
6396	CLS_EXCEPTION = 0x20,
6397
6398	/// (Obsolete) ARC-specific: this class has a .release_ivars method
6399	CLS_HAS_IVAR_RELEASER = 0x40,
6400	/// class was compiled with -fobjc-arr
6401	CLS_COMPILED_BY_ARC = 0x80 // (1<<7)
6402	};
6403
6404	static void Write__class_ro_t_initializer(ASTContext *Context, std::string &Result,
6405	unsigned int flags,
6406	const std::string &InstanceStart,
6407	const std::string &InstanceSize,
6408	ArrayRef<ObjCMethodDecl *>baseMethods,
6409	ArrayRef<ObjCProtocolDecl *>baseProtocols,
6410	ArrayRef<ObjCIvarDecl *>ivars,
6411	ArrayRef<ObjCPropertyDecl *>Properties,
6412	StringRef VarName,
6413	StringRef ClassName) {
6414	Result += "\nstatic struct _class_ro_t ";
6415	Result += VarName; Result += ClassName;
6416	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6417	Result += "\t";
6418	Result += llvm::utostr(X: flags); Result += ", ";
6419	Result += InstanceStart; Result += ", ";
6420	Result += InstanceSize; Result += ", \n";
6421	Result += "\t";
6422	const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6423	if (Triple.getArch() == llvm::Triple::x86_64)
6424	// uint32_t const reserved; // only when building for 64bit targets
6425	Result += "(unsigned int)0, \n\t";
6426	// const uint8_t * const ivarLayout;
6427	Result += "0, \n\t";
6428	Result += "\""; Result += ClassName; Result += "\",\n\t";
6429	bool metaclass = ((flags & CLS_META) != 0);
6430	if (baseMethods.size() > 0) {
6431	Result += "(const struct _method_list_t *)&";
6432	if (metaclass)
6433	Result += "_OBJC_$_CLASS_METHODS_";
6434	else
6435	Result += "_OBJC_$_INSTANCE_METHODS_";
6436	Result += ClassName;
6437	Result += ",\n\t";
6438	}
6439	else
6440	Result += "0, \n\t";
6441
6442	if (!metaclass && baseProtocols.size() > 0) {
6443	Result += "(const struct _objc_protocol_list *)&";
6444	Result += "_OBJC_CLASS_PROTOCOLS_$_"; Result += ClassName;
6445	Result += ",\n\t";
6446	}
6447	else
6448	Result += "0, \n\t";
6449
6450	if (!metaclass && ivars.size() > 0) {
6451	Result += "(const struct _ivar_list_t *)&";
6452	Result += "_OBJC_$_INSTANCE_VARIABLES_"; Result += ClassName;
6453	Result += ",\n\t";
6454	}
6455	else
6456	Result += "0, \n\t";
6457
6458	// weakIvarLayout
6459	Result += "0, \n\t";
6460	if (!metaclass && Properties.size() > 0) {
6461	Result += "(const struct _prop_list_t *)&";
6462	Result += "_OBJC_$_PROP_LIST_"; Result += ClassName;
6463	Result += ",\n";
6464	}
6465	else
6466	Result += "0, \n";
6467
6468	Result += "};\n";
6469	}
6470
6471	static void Write_class_t(ASTContext *Context, std::string &Result,
6472	StringRef VarName,
6473	const ObjCInterfaceDecl *CDecl, bool metaclass) {
6474	bool rootClass = (!CDecl->getSuperClass());
6475	const ObjCInterfaceDecl *RootClass = CDecl;
6476
6477	if (!rootClass) {
6478	// Find the Root class
6479	RootClass = CDecl->getSuperClass();
6480	while (RootClass->getSuperClass()) {
6481	RootClass = RootClass->getSuperClass();
6482	}
6483	}
6484
6485	if (metaclass && rootClass) {
6486	// Need to handle a case of use of forward declaration.
6487	Result += "\n";
6488	Result += "extern \"C\" ";
6489	if (CDecl->getImplementation())
6490	Result += "__declspec(dllexport) ";
6491	else
6492	Result += "__declspec(dllimport) ";
6493
6494	Result += "struct _class_t OBJC_CLASS_$_";
6495	Result += CDecl->getNameAsString();
6496	Result += ";\n";
6497	}
6498	// Also, for possibility of 'super' metadata class not having been defined yet.
6499	if (!rootClass) {
6500	ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
6501	Result += "\n";
6502	Result += "extern \"C\" ";
6503	if (SuperClass->getImplementation())
6504	Result += "__declspec(dllexport) ";
6505	else
6506	Result += "__declspec(dllimport) ";
6507
6508	Result += "struct _class_t ";
6509	Result += VarName;
6510	Result += SuperClass->getNameAsString();
6511	Result += ";\n";
6512
6513	if (metaclass && RootClass != SuperClass) {
6514	Result += "extern \"C\" ";
6515	if (RootClass->getImplementation())
6516	Result += "__declspec(dllexport) ";
6517	else
6518	Result += "__declspec(dllimport) ";
6519
6520	Result += "struct _class_t ";
6521	Result += VarName;
6522	Result += RootClass->getNameAsString();
6523	Result += ";\n";
6524	}
6525	}
6526
6527	Result += "\nextern \"C\" __declspec(dllexport) struct _class_t ";
6528	Result += VarName; Result += CDecl->getNameAsString();
6529	Result += " __attribute__ ((used, section (\"__DATA,__objc_data\"))) = {\n";
6530	Result += "\t";
6531	if (metaclass) {
6532	if (!rootClass) {
6533	Result += "0, // &"; Result += VarName;
6534	Result += RootClass->getNameAsString();
6535	Result += ",\n\t";
6536	Result += "0, // &"; Result += VarName;
6537	Result += CDecl->getSuperClass()->getNameAsString();
6538	Result += ",\n\t";
6539	}
6540	else {
6541	Result += "0, // &"; Result += VarName;
6542	Result += CDecl->getNameAsString();
6543	Result += ",\n\t";
6544	Result += "0, // &OBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6545	Result += ",\n\t";
6546	}
6547	}
6548	else {
6549	Result += "0, // &OBJC_METACLASS_$_";
6550	Result += CDecl->getNameAsString();
6551	Result += ",\n\t";
6552	if (!rootClass) {
6553	Result += "0, // &"; Result += VarName;
6554	Result += CDecl->getSuperClass()->getNameAsString();
6555	Result += ",\n\t";
6556	}
6557	else
6558	Result += "0,\n\t";
6559	}
6560	Result += "0, // (void *)&_objc_empty_cache,\n\t";
6561	Result += "0, // unused, was (void *)&_objc_empty_vtable,\n\t";
6562	if (metaclass)
6563	Result += "&_OBJC_METACLASS_RO_$_";
6564	else
6565	Result += "&_OBJC_CLASS_RO_$_";
6566	Result += CDecl->getNameAsString();
6567	Result += ",\n};\n";
6568
6569	// Add static function to initialize some of the meta-data fields.
6570	// avoid doing it twice.
6571	if (metaclass)
6572	return;
6573
6574	const ObjCInterfaceDecl *SuperClass =
6575	rootClass ? CDecl : CDecl->getSuperClass();
6576
6577	Result += "static void OBJC_CLASS_SETUP_$_";
6578	Result += CDecl->getNameAsString();
6579	Result += "(void ) {\n";
6580	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6581	Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6582	Result += RootClass->getNameAsString(); Result += ";\n";
6583
6584	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6585	Result += ".superclass = ";
6586	if (rootClass)
6587	Result += "&OBJC_CLASS_$_";
6588	else
6589	Result += "&OBJC_METACLASS_$_";
6590
6591	Result += SuperClass->getNameAsString(); Result += ";\n";
6592
6593	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6594	Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6595
6596	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6597	Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6598	Result += CDecl->getNameAsString(); Result += ";\n";
6599
6600	if (!rootClass) {
6601	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6602	Result += ".superclass = "; Result += "&OBJC_CLASS_$_";
6603	Result += SuperClass->getNameAsString(); Result += ";\n";
6604	}
6605
6606	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6607	Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6608	Result += "}\n";
6609	}
6610
6611	static void Write_category_t(RewriteModernObjC &RewriteObj, ASTContext *Context,
6612	std::string &Result,
6613	ObjCCategoryDecl *CatDecl,
6614	ObjCInterfaceDecl *ClassDecl,
6615	ArrayRef<ObjCMethodDecl *> InstanceMethods,
6616	ArrayRef<ObjCMethodDecl *> ClassMethods,
6617	ArrayRef<ObjCProtocolDecl *> RefedProtocols,
6618	ArrayRef<ObjCPropertyDecl *> ClassProperties) {
6619	StringRef CatName = CatDecl->getName();
6620	StringRef ClassName = ClassDecl->getName();
6621	// must declare an extern class object in case this class is not implemented
6622	// in this TU.
6623	Result += "\n";
6624	Result += "extern \"C\" ";
6625	if (ClassDecl->getImplementation())
6626	Result += "__declspec(dllexport) ";
6627	else
6628	Result += "__declspec(dllimport) ";
6629
6630	Result += "struct _class_t ";
6631	Result += "OBJC_CLASS_$_"; Result += ClassName;
6632	Result += ";\n";
6633
6634	Result += "\nstatic struct _category_t ";
6635	Result += "_OBJC_$_CATEGORY_";
6636	Result += ClassName; Result += "_$_"; Result += CatName;
6637	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6638	Result += "{\n";
6639	Result += "\t\""; Result += ClassName; Result += "\",\n";
6640	Result += "\t0, // &"; Result += "OBJC_CLASS_$_"; Result += ClassName;
6641	Result += ",\n";
6642	if (InstanceMethods.size() > 0) {
6643	Result += "\t(const struct _method_list_t *)&";
6644	Result += "_OBJC_$_CATEGORY_INSTANCE_METHODS_";
6645	Result += ClassName; Result += "_$_"; Result += CatName;
6646	Result += ",\n";
6647	}
6648	else
6649	Result += "\t0,\n";
6650
6651	if (ClassMethods.size() > 0) {
6652	Result += "\t(const struct _method_list_t *)&";
6653	Result += "_OBJC_$_CATEGORY_CLASS_METHODS_";
6654	Result += ClassName; Result += "_$_"; Result += CatName;
6655	Result += ",\n";
6656	}
6657	else
6658	Result += "\t0,\n";
6659
6660	if (RefedProtocols.size() > 0) {
6661	Result += "\t(const struct _protocol_list_t *)&";
6662	Result += "_OBJC_CATEGORY_PROTOCOLS_$_";
6663	Result += ClassName; Result += "_$_"; Result += CatName;
6664	Result += ",\n";
6665	}
6666	else
6667	Result += "\t0,\n";
6668
6669	if (ClassProperties.size() > 0) {
6670	Result += "\t(const struct _prop_list_t *)&"; Result += "_OBJC_$_PROP_LIST_";
6671	Result += ClassName; Result += "_$_"; Result += CatName;
6672	Result += ",\n";
6673	}
6674	else
6675	Result += "\t0,\n";
6676
6677	Result += "};\n";
6678
6679	// Add static function to initialize the class pointer in the category structure.
6680	Result += "static void OBJC_CATEGORY_SETUP_$_";
6681	Result += ClassDecl->getNameAsString();
6682	Result += "_$_";
6683	Result += CatName;
6684	Result += "(void ) {\n";
6685	Result += "\t_OBJC_$_CATEGORY_";
6686	Result += ClassDecl->getNameAsString();
6687	Result += "_$_";
6688	Result += CatName;
6689	Result += ".cls = "; Result += "&OBJC_CLASS_$_"; Result += ClassName;
6690	Result += ";\n}\n";
6691	}
6692
6693	static void Write__extendedMethodTypes_initializer(RewriteModernObjC &RewriteObj,
6694	ASTContext *Context, std::string &Result,
6695	ArrayRef<ObjCMethodDecl *> Methods,
6696	StringRef VarName,
6697	StringRef ProtocolName) {
6698	if (Methods.size() == 0)
6699	return;
6700
6701	Result += "\nstatic const char *";
6702	Result += VarName; Result += ProtocolName;
6703	Result += " [] __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6704	Result += "{\n";
6705	for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6706	ObjCMethodDecl *MD = Methods[i];
6707	std::string MethodTypeString =
6708	Context->getObjCEncodingForMethodDecl(Decl: MD, Extended: true);
6709	std::string QuoteMethodTypeString;
6710	RewriteObj.QuoteDoublequotes(From&: MethodTypeString, To&: QuoteMethodTypeString);
6711	Result += "\t\""; Result += QuoteMethodTypeString; Result += "\"";
6712	if (i == e-1)
6713	Result += "\n};\n";
6714	else {
6715	Result += ",\n";
6716	}
6717	}
6718	}
6719
6720	static void Write_IvarOffsetVar(RewriteModernObjC &RewriteObj,
6721	ASTContext *Context,
6722	std::string &Result,
6723	ArrayRef<ObjCIvarDecl *> Ivars,
6724	ObjCInterfaceDecl *CDecl) {
6725	// FIXME. visibility of offset symbols may have to be set; for Darwin
6726	// this is what happens:
6727	/**
6728	if (Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6729	Ivar->getAccessControl() == ObjCIvarDecl::Package ||
6730	Class->getVisibility() == HiddenVisibility)
6731	Visibility should be: HiddenVisibility;
6732	else
6733	Visibility should be: DefaultVisibility;
6734	*/
6735
6736	Result += "\n";
6737	for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6738	ObjCIvarDecl *IvarDecl = Ivars[i];
6739	if (Context->getLangOpts().MicrosoftExt)
6740	Result += "__declspec(allocate(\".objc_ivar$B\")) ";
6741
6742	if (!Context->getLangOpts().MicrosoftExt ||
6743	IvarDecl->getAccessControl() == ObjCIvarDecl::Private ||
6744	IvarDecl->getAccessControl() == ObjCIvarDecl::Package)
6745	Result += "extern \"C\" unsigned long int ";
6746	else
6747	Result += "extern \"C\" __declspec(dllexport) unsigned long int ";
6748	if (Ivars[i]->isBitField())
6749	RewriteObj.ObjCIvarBitfieldGroupOffset(IV: IvarDecl, Result);
6750	else
6751	WriteInternalIvarName(IDecl: CDecl, IvarDecl, Result);
6752	Result += " __attribute__ ((used, section (\"__DATA,__objc_ivar\")))";
6753	Result += " = ";
6754	RewriteObj.RewriteIvarOffsetComputation(ivar: IvarDecl, Result);
6755	Result += ";\n";
6756	if (Ivars[i]->isBitField()) {
6757	// skip over rest of the ivar bitfields.
6758	SKIP_BITFIELDS(i , e, Ivars);
6759	}
6760	}
6761	}
6762
6763	static void Write__ivar_list_t_initializer(RewriteModernObjC &RewriteObj,
6764	ASTContext *Context, std::string &Result,
6765	ArrayRef<ObjCIvarDecl *> OriginalIvars,
6766	StringRef VarName,
6767	ObjCInterfaceDecl *CDecl) {
6768	if (OriginalIvars.size() > 0) {
6769	Write_IvarOffsetVar(RewriteObj, Context, Result, Ivars: OriginalIvars, CDecl);
6770	SmallVector<ObjCIvarDecl *, 8> Ivars;
6771	// strip off all but the first ivar bitfield from each group of ivars.
6772	// Such ivars in the ivar list table will be replaced by their grouping struct
6773	// 'ivar'.
6774	for (unsigned i = 0, e = OriginalIvars.size(); i < e; i++) {
6775	if (OriginalIvars[i]->isBitField()) {
6776	Ivars.push_back(Elt: OriginalIvars[i]);
6777	// skip over rest of the ivar bitfields.
6778	SKIP_BITFIELDS(i , e, OriginalIvars);
6779	}
6780	else
6781	Ivars.push_back(Elt: OriginalIvars[i]);
6782	}
6783
6784	Result += "\nstatic ";
6785	Write__ivar_list_t_TypeDecl(Result, ivar_count: Ivars.size());
6786	Result += " "; Result += VarName;
6787	Result += CDecl->getNameAsString();
6788	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6789	Result += "\t"; Result += "sizeof(_ivar_t)"; Result += ",\n";
6790	Result += "\t"; Result += utostr(X: Ivars.size()); Result += ",\n";
6791	for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6792	ObjCIvarDecl *IvarDecl = Ivars[i];
6793	if (i == 0)
6794	Result += "\t{{";
6795	else
6796	Result += "\t {";
6797	Result += "(unsigned long int *)&";
6798	if (Ivars[i]->isBitField())
6799	RewriteObj.ObjCIvarBitfieldGroupOffset(IV: IvarDecl, Result);
6800	else
6801	WriteInternalIvarName(IDecl: CDecl, IvarDecl, Result);
6802	Result += ", ";
6803
6804	Result += "\"";
6805	if (Ivars[i]->isBitField())
6806	RewriteObj.ObjCIvarBitfieldGroupDecl(IV: Ivars[i], Result);
6807	else
6808	Result += IvarDecl->getName();
6809	Result += "\", ";
6810
6811	QualType IVQT = IvarDecl->getType();
6812	if (IvarDecl->isBitField())
6813	IVQT = RewriteObj.GetGroupRecordTypeForObjCIvarBitfield(IV: IvarDecl);
6814
6815	std::string IvarTypeString, QuoteIvarTypeString;
6816	Context->getObjCEncodingForType(IVQT, IvarTypeString,
6817	IvarDecl);
6818	RewriteObj.QuoteDoublequotes(From&: IvarTypeString, To&: QuoteIvarTypeString);
6819	Result += "\""; Result += QuoteIvarTypeString; Result += "\", ";
6820
6821	// FIXME. this alignment represents the host alignment and need be changed to
6822	// represent the target alignment.
6823	unsigned Align = Context->getTypeAlign(T: IVQT)/8;
6824	Align = llvm::Log2_32(Value: Align);
6825	Result += llvm::utostr(X: Align); Result += ", ";
6826	CharUnits Size = Context->getTypeSizeInChars(T: IVQT);
6827	Result += llvm::utostr(X: Size.getQuantity());
6828	if (i == e-1)
6829	Result += "}}\n";
6830	else
6831	Result += "},\n";
6832	}
6833	Result += "};\n";
6834	}
6835	}
6836
6837	/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
6838	void RewriteModernObjC::RewriteObjCProtocolMetaData(ObjCProtocolDecl *PDecl,
6839	std::string &Result) {
6840
6841	// Do not synthesize the protocol more than once.
6842	if (ObjCSynthesizedProtocols.count(Ptr: PDecl->getCanonicalDecl()))
6843	return;
6844	WriteModernMetadataDeclarations(Context, Result);
6845
6846	if (ObjCProtocolDecl *Def = PDecl->getDefinition())
6847	PDecl = Def;
6848	// Must write out all protocol definitions in current qualifier list,
6849	// and in their nested qualifiers before writing out current definition.
6850	for (auto *I : PDecl->protocols())
6851	RewriteObjCProtocolMetaData(PDecl: I, Result);
6852
6853	// Construct method lists.
6854	std::vector<ObjCMethodDecl *> InstanceMethods, ClassMethods;
6855	std::vector<ObjCMethodDecl *> OptInstanceMethods, OptClassMethods;
6856	for (auto *MD : PDecl->instance_methods()) {
6857	if (MD->getImplementationControl() == ObjCImplementationControl::Optional) {
6858	OptInstanceMethods.push_back(MD);
6859	} else {
6860	InstanceMethods.push_back(MD);
6861	}
6862	}
6863
6864	for (auto *MD : PDecl->class_methods()) {
6865	if (MD->getImplementationControl() == ObjCImplementationControl::Optional) {
6866	OptClassMethods.push_back(MD);
6867	} else {
6868	ClassMethods.push_back(MD);
6869	}
6870	}
6871	std::vector<ObjCMethodDecl *> AllMethods;
6872	for (unsigned i = 0, e = InstanceMethods.size(); i < e; i++)
6873	AllMethods.push_back(x: InstanceMethods[i]);
6874	for (unsigned i = 0, e = ClassMethods.size(); i < e; i++)
6875	AllMethods.push_back(x: ClassMethods[i]);
6876	for (unsigned i = 0, e = OptInstanceMethods.size(); i < e; i++)
6877	AllMethods.push_back(x: OptInstanceMethods[i]);
6878	for (unsigned i = 0, e = OptClassMethods.size(); i < e; i++)
6879	AllMethods.push_back(x: OptClassMethods[i]);
6880
6881	Write__extendedMethodTypes_initializer(*this, Context, Result,
6882	AllMethods,
6883	"_OBJC_PROTOCOL_METHOD_TYPES_",
6884	PDecl->getNameAsString());
6885	// Protocol's super protocol list
6886	SmallVector<ObjCProtocolDecl *, 8> SuperProtocols(PDecl->protocols());
6887	Write_protocol_list_initializer(Context, Result, SuperProtocols,
6888	"_OBJC_PROTOCOL_REFS_",
6889	PDecl->getNameAsString());
6890
6891	Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
6892	"_OBJC_PROTOCOL_INSTANCE_METHODS_",
6893	PDecl->getNameAsString(), false);
6894
6895	Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
6896	"_OBJC_PROTOCOL_CLASS_METHODS_",
6897	PDecl->getNameAsString(), false);
6898
6899	Write_method_list_t_initializer(*this, Context, Result, OptInstanceMethods,
6900	"_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_",
6901	PDecl->getNameAsString(), false);
6902
6903	Write_method_list_t_initializer(*this, Context, Result, OptClassMethods,
6904	"_OBJC_PROTOCOL_OPT_CLASS_METHODS_",
6905	PDecl->getNameAsString(), false);
6906
6907	// Protocol's property metadata.
6908	SmallVector<ObjCPropertyDecl *, 8> ProtocolProperties(
6909	PDecl->instance_properties());
6910	Write_prop_list_t_initializer(*this, Context, Result, ProtocolProperties,
6911	/* Container */nullptr,
6912	"_OBJC_PROTOCOL_PROPERTIES_",
6913	PDecl->getNameAsString());
6914
6915	// Writer out root metadata for current protocol: struct _protocol_t
6916	Result += "\n";
6917	if (LangOpts.MicrosoftExt)
6918	Result += "static ";
6919	Result += "struct _protocol_t _OBJC_PROTOCOL_";
6920	Result += PDecl->getNameAsString();
6921	Result += " __attribute__ ((used)) = {\n";
6922	Result += "\t0,\n"; // id is; is null
6923	Result += "\t\""; Result += PDecl->getNameAsString(); Result += "\",\n";
6924	if (SuperProtocols.size() > 0) {
6925	Result += "\t(const struct _protocol_list_t *)&"; Result += "_OBJC_PROTOCOL_REFS_";
6926	Result += PDecl->getNameAsString(); Result += ",\n";
6927	}
6928	else
6929	Result += "\t0,\n";
6930	if (InstanceMethods.size() > 0) {
6931	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
6932	Result += PDecl->getNameAsString(); Result += ",\n";
6933	}
6934	else
6935	Result += "\t0,\n";
6936
6937	if (ClassMethods.size() > 0) {
6938	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_CLASS_METHODS_";
6939	Result += PDecl->getNameAsString(); Result += ",\n";
6940	}
6941	else
6942	Result += "\t0,\n";
6943
6944	if (OptInstanceMethods.size() > 0) {
6945	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_";
6946	Result += PDecl->getNameAsString(); Result += ",\n";
6947	}
6948	else
6949	Result += "\t0,\n";
6950
6951	if (OptClassMethods.size() > 0) {
6952	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_CLASS_METHODS_";
6953	Result += PDecl->getNameAsString(); Result += ",\n";
6954	}
6955	else
6956	Result += "\t0,\n";
6957
6958	if (ProtocolProperties.size() > 0) {
6959	Result += "\t(const struct _prop_list_t *)&_OBJC_PROTOCOL_PROPERTIES_";
6960	Result += PDecl->getNameAsString(); Result += ",\n";
6961	}
6962	else
6963	Result += "\t0,\n";
6964
6965	Result += "\t"; Result += "sizeof(_protocol_t)"; Result += ",\n";
6966	Result += "\t0,\n";
6967
6968	if (AllMethods.size() > 0) {
6969	Result += "\t(const char **)&"; Result += "_OBJC_PROTOCOL_METHOD_TYPES_";
6970	Result += PDecl->getNameAsString();
6971	Result += "\n};\n";
6972	}
6973	else
6974	Result += "\t0\n};\n";
6975
6976	if (LangOpts.MicrosoftExt)
6977	Result += "static ";
6978	Result += "struct _protocol_t *";
6979	Result += "_OBJC_LABEL_PROTOCOL_$_"; Result += PDecl->getNameAsString();
6980	Result += " = &_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
6981	Result += ";\n";
6982
6983	// Mark this protocol as having been generated.
6984	if (!ObjCSynthesizedProtocols.insert(Ptr: PDecl->getCanonicalDecl()).second)
6985	llvm_unreachable("protocol already synthesized");
6986	}
6987
6988	/// hasObjCExceptionAttribute - Return true if this class or any super
6989	/// class has the __objc_exception__ attribute.
6990	/// FIXME. Move this to ASTContext.cpp as it is also used for IRGen.
6991	static bool hasObjCExceptionAttribute(ASTContext &Context,
6992	const ObjCInterfaceDecl *OID) {
6993	if (OID->hasAttr<ObjCExceptionAttr>())
6994	return true;
6995	if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
6996	return hasObjCExceptionAttribute(Context, OID: Super);
6997	return false;
6998	}
6999
7000	void RewriteModernObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
7001	std::string &Result) {
7002	ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7003
7004	// Explicitly declared @interface's are already synthesized.
7005	if (CDecl->isImplicitInterfaceDecl())
7006	assert(false &&
7007	"Legacy implicit interface rewriting not supported in moder abi");
7008
7009	WriteModernMetadataDeclarations(Context, Result);
7010	SmallVector<ObjCIvarDecl *, 8> IVars;
7011
7012	for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7013	IVD; IVD = IVD->getNextIvar()) {
7014	// Ignore unnamed bit-fields.
7015	if (!IVD->getDeclName())
7016	continue;
7017	IVars.push_back(Elt: IVD);
7018	}
7019
7020	Write__ivar_list_t_initializer(RewriteObj&: *this, Context, Result, OriginalIvars: IVars,
7021	VarName: "_OBJC_$_INSTANCE_VARIABLES_",
7022	CDecl);
7023
7024	// Build _objc_method_list for class's instance methods if needed
7025	SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7026
7027	// If any of our property implementations have associated getters or
7028	// setters, produce metadata for them as well.
7029	for (const auto *Prop : IDecl->property_impls()) {
7030	if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7031	continue;
7032	if (!Prop->getPropertyIvarDecl())
7033	continue;
7034	ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7035	if (!PD)
7036	continue;
7037	if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
7038	if (mustSynthesizeSetterGetterMethod(IDecl, PD, true /*getter*/))
7039	InstanceMethods.push_back(Getter);
7040	if (PD->isReadOnly())
7041	continue;
7042	if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
7043	if (mustSynthesizeSetterGetterMethod(IDecl, PD, false /*setter*/))
7044	InstanceMethods.push_back(Setter);
7045	}
7046
7047	Write_method_list_t_initializer(RewriteObj&: *this, Context, Result, Methods: InstanceMethods,
7048	VarName: "_OBJC_$_INSTANCE_METHODS_",
7049	TopLevelDeclName: IDecl->getNameAsString(), MethodImpl: true);
7050
7051	SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7052
7053	Write_method_list_t_initializer(RewriteObj&: *this, Context, Result, Methods: ClassMethods,
7054	VarName: "_OBJC_$_CLASS_METHODS_",
7055	TopLevelDeclName: IDecl->getNameAsString(), MethodImpl: true);
7056
7057	// Protocols referenced in class declaration?
7058	// Protocol's super protocol list
7059	std::vector<ObjCProtocolDecl *> RefedProtocols;
7060	const ObjCList<ObjCProtocolDecl> &Protocols = CDecl->getReferencedProtocols();
7061	for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
7062	E = Protocols.end();
7063	I != E; ++I) {
7064	RefedProtocols.push_back(x: *I);
7065	// Must write out all protocol definitions in current qualifier list,
7066	// and in their nested qualifiers before writing out current definition.
7067	RewriteObjCProtocolMetaData(PDecl: *I, Result);
7068	}
7069
7070	Write_protocol_list_initializer(Context, Result,
7071	SuperProtocols: RefedProtocols,
7072	VarName: "_OBJC_CLASS_PROTOCOLS_$_",
7073	ProtocolName: IDecl->getNameAsString());
7074
7075	// Protocol's property metadata.
7076	SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
7077	CDecl->instance_properties());
7078	Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7079	/* Container */IDecl,
7080	"_OBJC_$_PROP_LIST_",
7081	CDecl->getNameAsString());
7082
7083	// Data for initializing _class_ro_t metaclass meta-data
7084	uint32_t flags = CLS_META;
7085	std::string InstanceSize;
7086	std::string InstanceStart;
7087
7088	bool classIsHidden = CDecl->getVisibility() == HiddenVisibility;
7089	if (classIsHidden)
7090	flags |= OBJC2_CLS_HIDDEN;
7091
7092	if (!CDecl->getSuperClass())
7093	// class is root
7094	flags |= CLS_ROOT;
7095	InstanceSize = "sizeof(struct _class_t)";
7096	InstanceStart = InstanceSize;
7097	Write__class_ro_t_initializer(Context, Result, flags,
7098	InstanceStart, InstanceSize,
7099	ClassMethods,
7100	nullptr,
7101	nullptr,
7102	nullptr,
7103	"_OBJC_METACLASS_RO_$_",
7104	CDecl->getNameAsString());
7105
7106	// Data for initializing _class_ro_t meta-data
7107	flags = CLS;
7108	if (classIsHidden)
7109	flags |= OBJC2_CLS_HIDDEN;
7110
7111	if (hasObjCExceptionAttribute(Context&: *Context, OID: CDecl))
7112	flags |= CLS_EXCEPTION;
7113
7114	if (!CDecl->getSuperClass())
7115	// class is root
7116	flags |= CLS_ROOT;
7117
7118	InstanceSize.clear();
7119	InstanceStart.clear();
7120	if (!ObjCSynthesizedStructs.count(Ptr: CDecl)) {
7121	InstanceSize = "0";
7122	InstanceStart = "0";
7123	}
7124	else {
7125	InstanceSize = "sizeof(struct ";
7126	InstanceSize += CDecl->getNameAsString();
7127	InstanceSize += "_IMPL)";
7128
7129	ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7130	if (IVD) {
7131	RewriteIvarOffsetComputation(ivar: IVD, Result&: InstanceStart);
7132	}
7133	else
7134	InstanceStart = InstanceSize;
7135	}
7136	Write__class_ro_t_initializer(Context, Result, flags,
7137	InstanceStart, InstanceSize,
7138	InstanceMethods,
7139	RefedProtocols,
7140	IVars,
7141	ClassProperties,
7142	"_OBJC_CLASS_RO_$_",
7143	CDecl->getNameAsString());
7144
7145	Write_class_t(Context, Result,
7146	VarName: "OBJC_METACLASS_$_",
7147	CDecl, /*metaclass*/true);
7148
7149	Write_class_t(Context, Result,
7150	VarName: "OBJC_CLASS_$_",
7151	CDecl, /*metaclass*/false);
7152
7153	if (ImplementationIsNonLazy(IDecl))
7154	DefinedNonLazyClasses.push_back(Elt: CDecl);
7155	}
7156
7157	void RewriteModernObjC::RewriteClassSetupInitHook(std::string &Result) {
7158	int ClsDefCount = ClassImplementation.size();
7159	if (!ClsDefCount)
7160	return;
7161	Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7162	Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7163	Result += "static void *OBJC_CLASS_SETUP[] = {\n";
7164	for (int i = 0; i < ClsDefCount; i++) {
7165	ObjCImplementationDecl *IDecl = ClassImplementation[i];
7166	ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7167	Result += "\t(void *)&OBJC_CLASS_SETUP_$_";
7168	Result += CDecl->getName(); Result += ",\n";
7169	}
7170	Result += "};\n";
7171	}
7172
7173	void RewriteModernObjC::RewriteMetaDataIntoBuffer(std::string &Result) {
7174	int ClsDefCount = ClassImplementation.size();
7175	int CatDefCount = CategoryImplementation.size();
7176
7177	// For each implemented class, write out all its meta data.
7178	for (int i = 0; i < ClsDefCount; i++)
7179	RewriteObjCClassMetaData(IDecl: ClassImplementation[i], Result);
7180
7181	RewriteClassSetupInitHook(Result);
7182
7183	// For each implemented category, write out all its meta data.
7184	for (int i = 0; i < CatDefCount; i++)
7185	RewriteObjCCategoryImplDecl(CDecl: CategoryImplementation[i], Result);
7186
7187	RewriteCategorySetupInitHook(Result);
7188
7189	if (ClsDefCount > 0) {
7190	if (LangOpts.MicrosoftExt)
7191	Result += "__declspec(allocate(\".objc_classlist$B\")) ";
7192	Result += "static struct _class_t *L_OBJC_LABEL_CLASS_$ [";
7193	Result += llvm::utostr(X: ClsDefCount); Result += "]";
7194	Result +=
7195	" __attribute__((used, section (\"__DATA, __objc_classlist,"
7196	"regular,no_dead_strip\")))= {\n";
7197	for (int i = 0; i < ClsDefCount; i++) {
7198	Result += "\t&OBJC_CLASS_$_";
7199	Result += ClassImplementation[i]->getNameAsString();
7200	Result += ",\n";
7201	}
7202	Result += "};\n";
7203
7204	if (!DefinedNonLazyClasses.empty()) {
7205	if (LangOpts.MicrosoftExt)
7206	Result += "__declspec(allocate(\".objc_nlclslist$B\")) \n";
7207	Result += "static struct _class_t *_OBJC_LABEL_NONLAZY_CLASS_$[] = {\n\t";
7208	for (unsigned i = 0, e = DefinedNonLazyClasses.size(); i < e; i++) {
7209	Result += "\t&OBJC_CLASS_$_"; Result += DefinedNonLazyClasses[i]->getNameAsString();
7210	Result += ",\n";
7211	}
7212	Result += "};\n";
7213	}
7214	}
7215
7216	if (CatDefCount > 0) {
7217	if (LangOpts.MicrosoftExt)
7218	Result += "__declspec(allocate(\".objc_catlist$B\")) ";
7219	Result += "static struct _category_t *L_OBJC_LABEL_CATEGORY_$ [";
7220	Result += llvm::utostr(X: CatDefCount); Result += "]";
7221	Result +=
7222	" __attribute__((used, section (\"__DATA, __objc_catlist,"
7223	"regular,no_dead_strip\")))= {\n";
7224	for (int i = 0; i < CatDefCount; i++) {
7225	Result += "\t&_OBJC_$_CATEGORY_";
7226	Result +=
7227	CategoryImplementation[i]->getClassInterface()->getNameAsString();
7228	Result += "_$_";
7229	Result += CategoryImplementation[i]->getNameAsString();
7230	Result += ",\n";
7231	}
7232	Result += "};\n";
7233	}
7234
7235	if (!DefinedNonLazyCategories.empty()) {
7236	if (LangOpts.MicrosoftExt)
7237	Result += "__declspec(allocate(\".objc_nlcatlist$B\")) \n";
7238	Result += "static struct _category_t *_OBJC_LABEL_NONLAZY_CATEGORY_$[] = {\n\t";
7239	for (unsigned i = 0, e = DefinedNonLazyCategories.size(); i < e; i++) {
7240	Result += "\t&_OBJC_$_CATEGORY_";
7241	Result +=
7242	DefinedNonLazyCategories[i]->getClassInterface()->getNameAsString();
7243	Result += "_$_";
7244	Result += DefinedNonLazyCategories[i]->getNameAsString();
7245	Result += ",\n";
7246	}
7247	Result += "};\n";
7248	}
7249	}
7250
7251	void RewriteModernObjC::WriteImageInfo(std::string &Result) {
7252	if (LangOpts.MicrosoftExt)
7253	Result += "__declspec(allocate(\".objc_imageinfo$B\")) \n";
7254
7255	Result += "static struct IMAGE_INFO { unsigned version; unsigned flag; } ";
7256	// version 0, ObjCABI is 2
7257	Result += "_OBJC_IMAGE_INFO = { 0, 2 };\n";
7258	}
7259
7260	/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
7261	/// implementation.
7262	void RewriteModernObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
7263	std::string &Result) {
7264	WriteModernMetadataDeclarations(Context, Result);
7265	ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7266	// Find category declaration for this implementation.
7267	ObjCCategoryDecl *CDecl
7268	= ClassDecl->FindCategoryDeclaration(CategoryId: IDecl->getIdentifier());
7269
7270	std::string FullCategoryName = ClassDecl->getNameAsString();
7271	FullCategoryName += "_$_";
7272	FullCategoryName += CDecl->getNameAsString();
7273
7274	// Build _objc_method_list for class's instance methods if needed
7275	SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7276
7277	// If any of our property implementations have associated getters or
7278	// setters, produce metadata for them as well.
7279	for (const auto *Prop : IDecl->property_impls()) {
7280	if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7281	continue;
7282	if (!Prop->getPropertyIvarDecl())
7283	continue;
7284	ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7285	if (!PD)
7286	continue;
7287	if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
7288	InstanceMethods.push_back(Getter);
7289	if (PD->isReadOnly())
7290	continue;
7291	if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
7292	InstanceMethods.push_back(Setter);
7293	}
7294
7295	Write_method_list_t_initializer(RewriteObj&: *this, Context, Result, Methods: InstanceMethods,
7296	VarName: "_OBJC_$_CATEGORY_INSTANCE_METHODS_",
7297	TopLevelDeclName: FullCategoryName, MethodImpl: true);
7298
7299	SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7300
7301	Write_method_list_t_initializer(RewriteObj&: *this, Context, Result, Methods: ClassMethods,
7302	VarName: "_OBJC_$_CATEGORY_CLASS_METHODS_",
7303	TopLevelDeclName: FullCategoryName, MethodImpl: true);
7304
7305	// Protocols referenced in class declaration?
7306	// Protocol's super protocol list
7307	SmallVector<ObjCProtocolDecl *, 8> RefedProtocols(CDecl->protocols());
7308	for (auto *I : CDecl->protocols())
7309	// Must write out all protocol definitions in current qualifier list,
7310	// and in their nested qualifiers before writing out current definition.
7311	RewriteObjCProtocolMetaData(I, Result);
7312
7313	Write_protocol_list_initializer(Context, Result,
7314	SuperProtocols: RefedProtocols,
7315	VarName: "_OBJC_CATEGORY_PROTOCOLS_$_",
7316	ProtocolName: FullCategoryName);
7317
7318	// Protocol's property metadata.
7319	SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
7320	CDecl->instance_properties());
7321	Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7322	/* Container */IDecl,
7323	"_OBJC_$_PROP_LIST_",
7324	FullCategoryName);
7325
7326	Write_category_t(RewriteObj&: *this, Context, Result,
7327	CatDecl: CDecl,
7328	ClassDecl,
7329	InstanceMethods,
7330	ClassMethods,
7331	RefedProtocols,
7332	ClassProperties);
7333
7334	// Determine if this category is also "non-lazy".
7335	if (ImplementationIsNonLazy(IDecl))
7336	DefinedNonLazyCategories.push_back(Elt: CDecl);
7337	}
7338
7339	void RewriteModernObjC::RewriteCategorySetupInitHook(std::string &Result) {
7340	int CatDefCount = CategoryImplementation.size();
7341	if (!CatDefCount)
7342	return;
7343	Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7344	Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7345	Result += "static void *OBJC_CATEGORY_SETUP[] = {\n";
7346	for (int i = 0; i < CatDefCount; i++) {
7347	ObjCCategoryImplDecl *IDecl = CategoryImplementation[i];
7348	ObjCCategoryDecl *CatDecl= IDecl->getCategoryDecl();
7349	ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7350	Result += "\t(void *)&OBJC_CATEGORY_SETUP_$_";
7351	Result += ClassDecl->getName();
7352	Result += "_$_";
7353	Result += CatDecl->getName();
7354	Result += ",\n";
7355	}
7356	Result += "};\n";
7357	}
7358
7359	// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
7360	/// class methods.
7361	template<typename MethodIterator>
7362	void RewriteModernObjC::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
7363	MethodIterator MethodEnd,
7364	bool IsInstanceMethod,
7365	StringRef prefix,
7366	StringRef ClassName,
7367	std::string &Result) {
7368	if (MethodBegin == MethodEnd) return;
7369
7370	if (!objc_impl_method) {
7371	/* struct _objc_method {
7372	SEL _cmd;
7373	char *method_types;
7374	void *_imp;
7375	}
7376	*/
7377	Result += "\nstruct _objc_method {\n";
7378	Result += "\tSEL _cmd;\n";
7379	Result += "\tchar *method_types;\n";
7380	Result += "\tvoid *_imp;\n";
7381	Result += "};\n";
7382
7383	objc_impl_method = true;
7384	}
7385
7386	// Build _objc_method_list for class's methods if needed
7387
7388	/* struct {
7389	struct _objc_method_list *next_method;
7390	int method_count;
7391	struct _objc_method method_list[];
7392	}
7393	*/
7394	unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
7395	Result += "\n";
7396	if (LangOpts.MicrosoftExt) {
7397	if (IsInstanceMethod)
7398	Result += "__declspec(allocate(\".inst_meth$B\")) ";
7399	else
7400	Result += "__declspec(allocate(\".cls_meth$B\")) ";
7401	}
7402	Result += "static struct {\n";
7403	Result += "\tstruct _objc_method_list *next_method;\n";
7404	Result += "\tint method_count;\n";
7405	Result += "\tstruct _objc_method method_list[";
7406	Result += utostr(X: NumMethods);
7407	Result += "];\n} _OBJC_";
7408	Result += prefix;
7409	Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
7410	Result += "_METHODS_";
7411	Result += ClassName;
7412	Result += " __attribute__ ((used, section (\"__OBJC, __";
7413	Result += IsInstanceMethod ? "inst" : "cls";
7414	Result += "_meth\")))= ";
7415	Result += "{\n\t0, " + utostr(X: NumMethods) + "\n";
7416
7417	Result += "\t,{{(SEL)\"";
7418	Result += (*MethodBegin)->getSelector().getAsString().c_str();
7419	std::string MethodTypeString;
7420	Context->getObjCEncodingForMethodDecl(Decl: *MethodBegin, Extended: MethodTypeString);
7421	Result += "\", \"";
7422	Result += MethodTypeString;
7423	Result += "\", (void *)";
7424	Result += MethodInternalNames[*MethodBegin];
7425	Result += "}\n";
7426	for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
7427	Result += "\t ,{(SEL)\"";
7428	Result += (*MethodBegin)->getSelector().getAsString().c_str();
7429	std::string MethodTypeString;
7430	Context->getObjCEncodingForMethodDecl(Decl: *MethodBegin, Extended: MethodTypeString);
7431	Result += "\", \"";
7432	Result += MethodTypeString;
7433	Result += "\", (void *)";
7434	Result += MethodInternalNames[*MethodBegin];
7435	Result += "}\n";
7436	}
7437	Result += "\t }\n};\n";
7438	}
7439
7440	Stmt *RewriteModernObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
7441	SourceRange OldRange = IV->getSourceRange();
7442	Expr *BaseExpr = IV->getBase();
7443
7444	// Rewrite the base, but without actually doing replaces.
7445	{
7446	DisableReplaceStmtScope S(*this);
7447	BaseExpr = cast<Expr>(Val: RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
7448	IV->setBase(BaseExpr);
7449	}
7450
7451	ObjCIvarDecl *D = IV->getDecl();
7452
7453	Expr *Replacement = IV;
7454
7455	if (BaseExpr->getType()->isObjCObjectPointerType()) {
7456	const ObjCInterfaceType *iFaceDecl =
7457	dyn_cast<ObjCInterfaceType>(Val: BaseExpr->getType()->getPointeeType());
7458	assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
7459	// lookup which class implements the instance variable.
7460	ObjCInterfaceDecl *clsDeclared = nullptr;
7461	iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
7462	clsDeclared);
7463	assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
7464
7465	// Build name of symbol holding ivar offset.
7466	std::string IvarOffsetName;
7467	if (D->isBitField())
7468	ObjCIvarBitfieldGroupOffset(IV: D, Result&: IvarOffsetName);
7469	else
7470	WriteInternalIvarName(IDecl: clsDeclared, IvarDecl: D, Result&: IvarOffsetName);
7471
7472	ReferencedIvars[clsDeclared].insert(X: D);
7473
7474	// cast offset to "char *".
7475	CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Ctx: Context,
7476	Ty: Context->getPointerType(Context->CharTy),
7477	Kind: CK_BitCast,
7478	E: BaseExpr);
7479	VarDecl *NewVD = VarDecl::Create(C&: *Context, DC: TUDecl, StartLoc: SourceLocation(),
7480	IdLoc: SourceLocation(), Id: &Context->Idents.get(Name: IvarOffsetName),
7481	T: Context->UnsignedLongTy, TInfo: nullptr,
7482	S: SC_Extern);
7483	DeclRefExpr *DRE = new (Context)
7484	DeclRefExpr(*Context, NewVD, false, Context->UnsignedLongTy,
7485	VK_LValue, SourceLocation());
7486	BinaryOperator *addExpr = BinaryOperator::Create(
7487	C: *Context, lhs: castExpr, rhs: DRE, opc: BO_Add,
7488	ResTy: Context->getPointerType(Context->CharTy), VK: VK_PRValue, OK: OK_Ordinary,
7489	opLoc: SourceLocation(), FPFeatures: FPOptionsOverride());
7490	// Don't forget the parens to enforce the proper binding.
7491	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(),
7492	SourceLocation(),
7493	addExpr);
7494	QualType IvarT = D->getType();
7495	if (D->isBitField())
7496	IvarT = GetGroupRecordTypeForObjCIvarBitfield(IV: D);
7497
7498	if (!IvarT->getAs<TypedefType>() && IvarT->isRecordType()) {
7499	RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
7500	RD = RD->getDefinition();
7501	if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
7502	// decltype(((Foo_IMPL*)0)->bar) *
7503	auto *CDecl = cast<ObjCContainerDecl>(D->getDeclContext());
7504	// ivar in class extensions requires special treatment.
7505	if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
7506	CDecl = CatDecl->getClassInterface();
7507	std::string RecName = std::string(CDecl->getName());
7508	RecName += "_IMPL";
7509	RecordDecl *RD = RecordDecl::Create(
7510	*Context, TagTypeKind::Struct, TUDecl, SourceLocation(),
7511	SourceLocation(), &Context->Idents.get(Name: RecName));
7512	QualType PtrStructIMPL = Context->getPointerType(T: Context->getTagDeclType(RD));
7513	unsigned UnsignedIntSize =
7514	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
7515	Expr *Zero = IntegerLiteral::Create(*Context,
7516	llvm::APInt(UnsignedIntSize, 0),
7517	Context->UnsignedIntTy, SourceLocation());
7518	Zero = NoTypeInfoCStyleCastExpr(Ctx: Context, Ty: PtrStructIMPL, Kind: CK_BitCast, E: Zero);
7519	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
7520	Zero);
7521	FieldDecl *FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
7522	IdLoc: SourceLocation(),
7523	Id: &Context->Idents.get(D->getNameAsString()),
7524	T: IvarT, TInfo: nullptr,
7525	/*BitWidth=*/BW: nullptr,
7526	/*Mutable=*/true, InitStyle: ICIS_NoInit);
7527	MemberExpr *ME = MemberExpr::CreateImplicit(
7528	C: *Context, Base: PE, IsArrow: true, MemberDecl: FD, T: FD->getType(), VK: VK_LValue, OK: OK_Ordinary);
7529	IvarT = Context->getDecltypeType(e: ME, UnderlyingType: ME->getType());
7530	}
7531	}
7532	convertObjCTypeToCStyleType(T&: IvarT);
7533	QualType castT = Context->getPointerType(T: IvarT);
7534
7535	castExpr = NoTypeInfoCStyleCastExpr(Context,
7536	castT,
7537	CK_BitCast,
7538	PE);
7539
7540	Expr *Exp = UnaryOperator::Create(
7541	const_cast<ASTContext &>(*Context), castExpr, UO_Deref, IvarT,
7542	VK_LValue, OK_Ordinary, SourceLocation(), false, FPOptionsOverride());
7543	PE = new (Context) ParenExpr(OldRange.getBegin(),
7544	OldRange.getEnd(),
7545	Exp);
7546
7547	if (D->isBitField()) {
7548	FieldDecl *FD = FieldDecl::Create(C: *Context, DC: nullptr, StartLoc: SourceLocation(),
7549	IdLoc: SourceLocation(),
7550	Id: &Context->Idents.get(D->getNameAsString()),
7551	T: D->getType(), TInfo: nullptr,
7552	/*BitWidth=*/BW: D->getBitWidth(),
7553	/*Mutable=*/true, InitStyle: ICIS_NoInit);
7554	MemberExpr *ME =
7555	MemberExpr::CreateImplicit(C: *Context, Base: PE, /*isArrow*/ IsArrow: false, MemberDecl: FD,
7556	T: FD->getType(), VK: VK_LValue, OK: OK_Ordinary);
7557	Replacement = ME;
7558
7559	}
7560	else
7561	Replacement = PE;
7562	}
7563
7564	ReplaceStmtWithRange(IV, Replacement, OldRange);
7565	return Replacement;
7566	}
7567
7568	#endif // CLANG_ENABLE_OBJC_REWRITER
7569