RewriteModernObjC.cpp source code [clang_source_code/lib/Frontend/Rewrite/RewriteModernObjC.cpp]

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/SmallPtrSet.h"
28	#include "llvm/ADT/StringExtras.h"
29	#include "llvm/Support/MemoryBuffer.h"
30	#include "llvm/Support/raw_ostream.h"
31	#include <memory>
32
33	#if CLANG_ENABLE_OBJC_REWRITER
34
35	using namespace clang;
36	using llvm::utostr;
37
38	namespace {
39	class RewriteModernObjC : public ASTConsumer {
40	protected:
41
42	enum {
43	BLOCK_FIELD_IS_OBJECT = 3, /* id, NSObject, __attribute__((NSObject)),
44	block, ... */
45	BLOCK_FIELD_IS_BLOCK = 7, /* a block variable */
46	BLOCK_FIELD_IS_BYREF = 8, /* the on stack structure holding the
47	__block variable */
48	BLOCK_FIELD_IS_WEAK = 16, /* declared __weak, only used in byref copy
49	helpers */
50	BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
51	support routines */
52	BLOCK_BYREF_CURRENT_MAX = 256
53	};
54
55	enum {
56	BLOCK_NEEDS_FREE = (1 << 24),
57	BLOCK_HAS_COPY_DISPOSE = (1 << 25),
58	BLOCK_HAS_CXX_OBJ = (1 << 26),
59	BLOCK_IS_GC = (1 << 27),
60	BLOCK_IS_GLOBAL = (1 << 28),
61	BLOCK_HAS_DESCRIPTOR = (1 << 29)
62	};
63
64	Rewriter Rewrite;
65	DiagnosticsEngine &Diags;
66	const LangOptions &LangOpts;
67	ASTContext *Context;
68	SourceManager *SM;
69	TranslationUnitDecl *TUDecl;
70	FileID MainFileID;
71	const char MainFileStart, MainFileEnd;
72	Stmt *CurrentBody;
73	ParentMap *PropParentMap; // created lazily.
74	std::string InFileName;
75	std::unique_ptr<raw_ostream> OutFile;
76	std::string Preamble;
77
78	TypeDecl *ProtocolTypeDecl;
79	VarDecl *GlobalVarDecl;
80	Expr *GlobalConstructionExp;
81	unsigned RewriteFailedDiag;
82	unsigned GlobalBlockRewriteFailedDiag;
83	// ObjC string constant support.
84	unsigned NumObjCStringLiterals;
85	VarDecl *ConstantStringClassReference;
86	RecordDecl *NSStringRecord;
87
88	// ObjC foreach break/continue generation support.
89	int BcLabelCount;
90
91	unsigned TryFinallyContainsReturnDiag;
92	// Needed for super.
93	ObjCMethodDecl *CurMethodDef;
94	RecordDecl *SuperStructDecl;
95	RecordDecl *ConstantStringDecl;
96
97	FunctionDecl *MsgSendFunctionDecl;
98	FunctionDecl *MsgSendSuperFunctionDecl;
99	FunctionDecl *MsgSendStretFunctionDecl;
100	FunctionDecl *MsgSendSuperStretFunctionDecl;
101	FunctionDecl *MsgSendFpretFunctionDecl;
102	FunctionDecl *GetClassFunctionDecl;
103	FunctionDecl *GetMetaClassFunctionDecl;
104	FunctionDecl *GetSuperClassFunctionDecl;
105	FunctionDecl *SelGetUidFunctionDecl;
106	FunctionDecl *CFStringFunctionDecl;
107	FunctionDecl *SuperConstructorFunctionDecl;
108	FunctionDecl *CurFunctionDef;
109
110	/* Misc. containers needed for meta-data rewrite. */
111	SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
112	SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
113	llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
114	llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
115	llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCWrittenInterfaces;
116	llvm::SmallPtrSet<TagDecl*, 32> GlobalDefinedTags;
117	SmallVector<ObjCInterfaceDecl*, 32> ObjCInterfacesSeen;
118	/// DefinedNonLazyClasses - List of defined "non-lazy" classes.
119	SmallVector<ObjCInterfaceDecl*, 8> DefinedNonLazyClasses;
120
121	/// DefinedNonLazyCategories - List of defined "non-lazy" categories.
122	SmallVector<ObjCCategoryDecl *, 8> DefinedNonLazyCategories;
123
124	SmallVector<Stmt *, 32> Stmts;
125	SmallVector<int, 8> ObjCBcLabelNo;
126	// Remember all the @protocol(<expr>) expressions.
127	llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
128
129	llvm::DenseSet<uint64_t> CopyDestroyCache;
130
131	// Block expressions.
132	SmallVector<BlockExpr *, 32> Blocks;
133	SmallVector<int, 32> InnerDeclRefsCount;
134	SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
135
136	SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
137
138	// Block related declarations.
139	SmallVector<ValueDecl *, 8> BlockByCopyDecls;
140	llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
141	SmallVector<ValueDecl *, 8> BlockByRefDecls;
142	llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
143	llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
144	llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
145	llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
146
147	llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
148	llvm::DenseMap<ObjCInterfaceDecl *,
149	llvm::SmallSetVector<ObjCIvarDecl *, 8> > ReferencedIvars;
150
151	// ivar bitfield grouping containers
152	llvm::DenseSet<const ObjCInterfaceDecl *> ObjCInterefaceHasBitfieldGroups;
153	llvm::DenseMap<const ObjCIvarDecl* , unsigned> IvarGroupNumber;
154	// This container maps an <class, group number for ivar> tuple to the type
155	// of the struct where the bitfield belongs.
156	llvm::DenseMap<std::pair<const ObjCInterfaceDecl*, unsigned>, QualType> GroupRecordType;
157	SmallVector<FunctionDecl*, 32> FunctionDefinitionsSeen;
158
159	// This maps an original source AST to it's rewritten form. This allows
160	// us to avoid rewriting the same node twice (which is very uncommon).
161	// This is needed to support some of the exotic property rewriting.
162	llvm::DenseMap<Stmt , Stmt > ReplacedNodes;
163
164	// Needed for header files being rewritten
165	bool IsHeader;
166	bool SilenceRewriteMacroWarning;
167	bool GenerateLineInfo;
168	bool objc_impl_method;
169
170	bool DisableReplaceStmt;
171	class DisableReplaceStmtScope {
172	RewriteModernObjC &R;
173	bool SavedValue;
174
175	public:
176	DisableReplaceStmtScope(RewriteModernObjC &R)
177	: R(R), SavedValue(R.DisableReplaceStmt) {
178	R.DisableReplaceStmt = true;
179	}
180	~DisableReplaceStmtScope() {
181	R.DisableReplaceStmt = SavedValue;
182	}
183	};
184	void InitializeCommon(ASTContext &context);
185
186	public:
187	llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
188
189	// Top Level Driver code.
190	bool HandleTopLevelDecl(DeclGroupRef D) override {
191	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
192	if (ObjCInterfaceDecl Class = dyn_cast<ObjCInterfaceDecl>(I)) {
193	if (!Class->isThisDeclarationADefinition()) {
194	RewriteForwardClassDecl(D);
195	break;
196	} else {
197	// Keep track of all interface declarations seen.
198	ObjCInterfacesSeen.push_back(Class);
199	break;
200	}
201	}
202
203	if (ObjCProtocolDecl Proto = dyn_cast<ObjCProtocolDecl>(I)) {
204	if (!Proto->isThisDeclarationADefinition()) {
205	RewriteForwardProtocolDecl(D);
206	break;
207	}
208	}
209
210	if (FunctionDecl FDecl = dyn_cast<FunctionDecl>(I)) {
211	// Under modern abi, we cannot translate body of the function
212	// yet until all class extensions and its implementation is seen.
213	// This is because they may introduce new bitfields which must go
214	// into their grouping struct.
215	if (FDecl->isThisDeclarationADefinition() &&
216	// Not c functions defined inside an objc container.
217	!FDecl->isTopLevelDeclInObjCContainer()) {
218	FunctionDefinitionsSeen.push_back(FDecl);
219	break;
220	}
221	}
222	HandleTopLevelSingleDecl(*I);
223	}
224	return true;
225	}
226
227	void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
228	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
229	if (TypedefNameDecl TD = dyn_cast<TypedefNameDecl>(I)) {
230	if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
231	RewriteBlockPointerDecl(TD);
232	else if (TD->getUnderlyingType()->isFunctionPointerType())
233	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
234	else
235	RewriteObjCQualifiedInterfaceTypes(TD);
236	}
237	}
238	}
239
240	void HandleTopLevelSingleDecl(Decl *D);
241	void HandleDeclInMainFile(Decl *D);
242	RewriteModernObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
243	DiagnosticsEngine &D, const LangOptions &LOpts,
244	bool silenceMacroWarn, bool LineInfo);
245
246	~RewriteModernObjC() override {}
247
248	void HandleTranslationUnit(ASTContext &C) override;
249
250	void ReplaceStmt(Stmt Old, Stmt New) {
251	ReplaceStmtWithRange(Old, New, Old->getSourceRange());
252	}
253
254	void ReplaceStmtWithRange(Stmt Old, Stmt New, SourceRange SrcRange) {
255	assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
256
257	Stmt *ReplacingStmt = ReplacedNodes[Old];
258	if (ReplacingStmt)
259	return; // We can't rewrite the same node twice.
260
261	if (DisableReplaceStmt)
262	return;
263
264	// Measure the old text.
265	int Size = Rewrite.getRangeSize(SrcRange);
266	if (Size == -1) {
267	Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
268	<< Old->getSourceRange();
269	return;
270	}
271	// Get the new text.
272	std::string SStr;
273	llvm::raw_string_ostream S(SStr);
274	New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
275	const std::string &Str = S.str();
276
277	// If replacement succeeded or warning disabled return with no warning.
278	if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
279	ReplacedNodes[Old] = New;
280	return;
281	}
282	if (SilenceRewriteMacroWarning)
283	return;
284	Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
285	<< Old->getSourceRange();
286	}
287
288	void InsertText(SourceLocation Loc, StringRef Str,
289	bool InsertAfter = true) {
290	// If insertion succeeded or warning disabled return with no warning.
291	if (!Rewrite.InsertText(Loc, Str, InsertAfter) \|\|
292	SilenceRewriteMacroWarning)
293	return;
294
295	Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
296	}
297
298	void ReplaceText(SourceLocation Start, unsigned OrigLength,
299	StringRef Str) {
300	// If removal succeeded or warning disabled return with no warning.
301	if (!Rewrite.ReplaceText(Start, OrigLength, Str) \|\|
302	SilenceRewriteMacroWarning)
303	return;
304
305	Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
306	}
307
308	// Syntactic Rewriting.
309	void RewriteRecordBody(RecordDecl *RD);
310	void RewriteInclude();
311	void RewriteLineDirective(const Decl *D);
312	void ConvertSourceLocationToLineDirective(SourceLocation Loc,
313	std::string &LineString);
314	void RewriteForwardClassDecl(DeclGroupRef D);
315	void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
316	void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
317	const std::string &typedefString);
318	void RewriteImplementations();
319	void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
320	ObjCImplementationDecl *IMD,
321	ObjCCategoryImplDecl *CID);
322	void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
323	void RewriteImplementationDecl(Decl *Dcl);
324	void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
325	ObjCMethodDecl *MDecl, std::string &ResultStr);
326	void RewriteTypeIntoString(QualType T, std::string &ResultStr,
327	const FunctionType *&FPRetType);
328	void RewriteByRefString(std::string &ResultStr, const std::string &Name,
329	ValueDecl *VD, bool def=false);
330	void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
331	void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
332	void RewriteForwardProtocolDecl(DeclGroupRef D);
333	void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
334	void RewriteMethodDeclaration(ObjCMethodDecl *Method);
335	void RewriteProperty(ObjCPropertyDecl *prop);
336	void RewriteFunctionDecl(FunctionDecl *FD);
337	void RewriteBlockPointerType(std::string& Str, QualType Type);
338	void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
339	void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
340	void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
341	void RewriteTypeOfDecl(VarDecl *VD);
342	void RewriteObjCQualifiedInterfaceTypes(Expr *E);
343
344	std::string getIvarAccessString(ObjCIvarDecl *D);
345
346	// Expression Rewriting.
347	Stmt RewriteFunctionBodyOrGlobalInitializer(Stmt S);
348	Stmt RewriteAtEncode(ObjCEncodeExpr Exp);
349	Stmt RewritePropertyOrImplicitGetter(PseudoObjectExpr Pseudo);
350	Stmt RewritePropertyOrImplicitSetter(PseudoObjectExpr Pseudo);
351	Stmt RewriteAtSelector(ObjCSelectorExpr Exp);
352	Stmt RewriteMessageExpr(ObjCMessageExpr Exp);
353	Stmt RewriteObjCStringLiteral(ObjCStringLiteral Exp);
354	Stmt RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr Exp);
355	Stmt RewriteObjCBoxedExpr(ObjCBoxedExpr Exp);
356	Stmt RewriteObjCArrayLiteralExpr(ObjCArrayLiteral Exp);
357	Stmt RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral Exp);
358	Stmt RewriteObjCProtocolExpr(ObjCProtocolExpr Exp);
359	Stmt RewriteObjCTryStmt(ObjCAtTryStmt S);
360	Stmt RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt S);
361	Stmt RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt S);
362	Stmt RewriteObjCThrowStmt(ObjCAtThrowStmt S);
363	Stmt RewriteObjCForCollectionStmt(ObjCForCollectionStmt S,
364	SourceLocation OrigEnd);
365	Stmt RewriteBreakStmt(BreakStmt S);
366	Stmt RewriteContinueStmt(ContinueStmt S);
367	void RewriteCastExpr(CStyleCastExpr *CE);
368	void RewriteImplicitCastObjCExpr(CastExpr *IE);
369
370	// Computes ivar bitfield group no.
371	unsigned ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV);
372	// Names field decl. for ivar bitfield group.
373	void ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV, std::string &Result);
374	// Names struct type for ivar bitfield group.
375	void ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV, std::string &Result);
376	// Names symbol for ivar bitfield group field offset.
377	void ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV, std::string &Result);
378	// Given an ivar bitfield, it builds (or finds) its group record type.
379	QualType GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV);
380	QualType SynthesizeBitfieldGroupStructType(
381	ObjCIvarDecl *IV,
382	SmallVectorImpl<ObjCIvarDecl *> &IVars);
383
384	// Block rewriting.
385	void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
386
387	// Block specific rewrite rules.
388	void RewriteBlockPointerDecl(NamedDecl *VD);
389	void RewriteByRefVar(VarDecl *VD, bool firstDecl, bool lastDecl);
390	Stmt RewriteBlockDeclRefExpr(DeclRefExpr VD);
391	Stmt RewriteLocalVariableExternalStorage(DeclRefExpr DRE);
392	void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
393
394	void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
395	std::string &Result);
396
397	void RewriteObjCFieldDecl(FieldDecl *fieldDecl, std::string &Result);
398	bool IsTagDefinedInsideClass(ObjCContainerDecl IDecl, TagDecl Tag,
399	bool &IsNamedDefinition);
400	void RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
401	std::string &Result);
402
403	bool RewriteObjCFieldDeclType(QualType &Type, std::string &Result);
404
405	void RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
406	std::string &Result);
407
408	void Initialize(ASTContext &context) override;
409
410	// Misc. AST transformation routines. Sometimes they end up calling
411	// rewriting routines on the new ASTs.
412	CallExpr SynthesizeCallToFunctionDecl(FunctionDecl FD,
413	ArrayRef<Expr *> Args,
414	SourceLocation StartLoc=SourceLocation(),
415	SourceLocation EndLoc=SourceLocation());
416
417	Expr SynthMsgSendStretCallExpr(FunctionDecl MsgSendStretFlavor,
418	QualType returnType,
419	SmallVectorImpl<QualType> &ArgTypes,
420	SmallVectorImpl<Expr*> &MsgExprs,
421	ObjCMethodDecl *Method);
422
423	Stmt SynthMessageExpr(ObjCMessageExpr Exp,
424	SourceLocation StartLoc=SourceLocation(),
425	SourceLocation EndLoc=SourceLocation());
426
427	void SynthCountByEnumWithState(std::string &buf);
428	void SynthMsgSendFunctionDecl();
429	void SynthMsgSendSuperFunctionDecl();
430	void SynthMsgSendStretFunctionDecl();
431	void SynthMsgSendFpretFunctionDecl();
432	void SynthMsgSendSuperStretFunctionDecl();
433	void SynthGetClassFunctionDecl();
434	void SynthGetMetaClassFunctionDecl();
435	void SynthGetSuperClassFunctionDecl();
436	void SynthSelGetUidFunctionDecl();
437	void SynthSuperConstructorFunctionDecl();
438
439	// Rewriting metadata
440	template<typename MethodIterator>
441	void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
442	MethodIterator MethodEnd,
443	bool IsInstanceMethod,
444	StringRef prefix,
445	StringRef ClassName,
446	std::string &Result);
447	void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
448	std::string &Result);
449	void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
450	std::string &Result);
451	void RewriteClassSetupInitHook(std::string &Result);
452
453	void RewriteMetaDataIntoBuffer(std::string &Result);
454	void WriteImageInfo(std::string &Result);
455	void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
456	std::string &Result);
457	void RewriteCategorySetupInitHook(std::string &Result);
458
459	// Rewriting ivar
460	void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
461	std::string &Result);
462	Stmt RewriteObjCIvarRefExpr(ObjCIvarRefExpr IV);
463
464
465	std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
466	std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
467	StringRef funcName, std::string Tag);
468	std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
469	StringRef funcName, std::string Tag);
470	std::string SynthesizeBlockImpl(BlockExpr *CE,
471	std::string Tag, std::string Desc);
472	std::string SynthesizeBlockDescriptor(std::string DescTag,
473	std::string ImplTag,
474	int i, StringRef funcName,
475	unsigned hasCopy);
476	Stmt SynthesizeBlockCall(CallExpr Exp, const Expr* BlockExp);
477	void SynthesizeBlockLiterals(SourceLocation FunLocStart,
478	StringRef FunName);
479	FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
480	Stmt SynthBlockInitExpr(BlockExpr Exp,
481	const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
482
483	// Misc. helper routines.
484	QualType getProtocolType();
485	void WarnAboutReturnGotoStmts(Stmt *S);
486	void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
487	void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
488	void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
489
490	bool IsDeclStmtInForeachHeader(DeclStmt *DS);
491	void CollectBlockDeclRefInfo(BlockExpr *Exp);
492	void GetBlockDeclRefExprs(Stmt *S);
493	void GetInnerBlockDeclRefExprs(Stmt *S,
494	SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
495	llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
496
497	// We avoid calling Type::isBlockPointerType(), since it operates on the
498	// canonical type. We only care if the top-level type is a closure pointer.
499	bool isTopLevelBlockPointerType(QualType T) {
500	return isa<BlockPointerType>(T);
501	}
502
503	/// convertBlockPointerToFunctionPointer - Converts a block-pointer type
504	/// to a function pointer type and upon success, returns true; false
505	/// otherwise.
506	bool convertBlockPointerToFunctionPointer(QualType &T) {
507	if (isTopLevelBlockPointerType(T)) {
508	const BlockPointerType *BPT = T->getAs<BlockPointerType>();
509	T = Context->getPointerType(BPT->getPointeeType());
510	return true;
511	}
512	return false;
513	}
514
515	bool convertObjCTypeToCStyleType(QualType &T);
516
517	bool needToScanForQualifiers(QualType T);
518	QualType getSuperStructType();
519	QualType getConstantStringStructType();
520	QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
521
522	void convertToUnqualifiedObjCType(QualType &T) {
523	if (T->isObjCQualifiedIdType()) {
524	bool isConst = T.isConstQualified();
525	T = isConst ? Context->getObjCIdType().withConst()
526	: Context->getObjCIdType();
527	}
528	else if (T->isObjCQualifiedClassType())
529	T = Context->getObjCClassType();
530	else if (T->isObjCObjectPointerType() &&
531	T->getPointeeType()->isObjCQualifiedInterfaceType()) {
532	if (const ObjCObjectPointerType * OBJPT =
533	T->getAsObjCInterfacePointerType()) {
534	const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
535	T = QualType(IFaceT, 0);
536	T = Context->getPointerType(T);
537	}
538	}
539	}
540
541	// FIXME: This predicate seems like it would be useful to add to ASTContext.
542	bool isObjCType(QualType T) {
543	if (!LangOpts.ObjC)
544	return false;
545
546	QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
547
548	if (OCT == Context->getCanonicalType(Context->getObjCIdType()) \|\|
549	OCT == Context->getCanonicalType(Context->getObjCClassType()))
550	return true;
551
552	if (const PointerType *PT = OCT->getAs<PointerType>()) {
553	if (isa<ObjCInterfaceType>(PT->getPointeeType()) \|\|
554	PT->getPointeeType()->isObjCQualifiedIdType())
555	return true;
556	}
557	return false;
558	}
559
560	bool PointerTypeTakesAnyBlockArguments(QualType QT);
561	bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
562	void GetExtentOfArgList(const char Name, const char &LParen,
563	const char *&RParen);
564
565	void QuoteDoublequotes(std::string &From, std::string &To) {
566	for (unsigned i = 0; i < From.length(); i++) {
567	if (From[i] == '"')
568	To += "\\\"";
569	else
570	To += From[i];
571	}
572	}
573
574	QualType getSimpleFunctionType(QualType result,
575	ArrayRef<QualType> args,
576	bool variadic = false) {
577	if (result == Context->getObjCInstanceType())
578	result = Context->getObjCIdType();
579	FunctionProtoType::ExtProtoInfo fpi;
580	fpi.Variadic = variadic;
581	return Context->getFunctionType(result, args, fpi);
582	}
583
584	// Helper function: create a CStyleCastExpr with trivial type source info.
585	CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
586	CastKind Kind, Expr *E) {
587	TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
588	return CStyleCastExpr::Create(*Ctx, Ty, VK_RValue, Kind, E, nullptr,
589	TInfo, SourceLocation(), SourceLocation());
590	}
591
592	bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
593	IdentifierInfo* II = &Context->Idents.get("load");
594	Selector LoadSel = Context->Selectors.getSelector(0, &II);
595	return OD->getClassMethod(LoadSel) != nullptr;
596	}
597
598	StringLiteral *getStringLiteral(StringRef Str) {
599	QualType StrType = Context->getConstantArrayType(
600	Context->CharTy, llvm::APInt(32, Str.size() + 1), ArrayType::Normal,
601	0);
602	return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
603	/Pascal=/false, StrType, SourceLocation());
604	}
605	};
606	} // end anonymous namespace
607
608	void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
609	NamedDecl *D) {
610	if (const FunctionProtoType *fproto
611	= dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
612	for (const auto &I : fproto->param_types())
613	if (isTopLevelBlockPointerType(I)) {
614	// All the args are checked/rewritten. Don't call twice!
615	RewriteBlockPointerDecl(D);
616	break;
617	}
618	}
619	}
620
621	void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
622	const PointerType *PT = funcType->getAs<PointerType>();
623	if (PT && PointerTypeTakesAnyBlockArguments(funcType))
624	RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
625	}
626
627	static bool IsHeaderFile(const std::string &Filename) {
628	std::string::size_type DotPos = Filename.rfind('.');
629
630	if (DotPos == std::string::npos) {
631	// no file extension
632	return false;
633	}
634
635	std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
636	// C header: .h
637	// C++ header: .hh or .H;
638	return Ext == "h" \|\| Ext == "hh" \|\| Ext == "H";
639	}
640
641	RewriteModernObjC::RewriteModernObjC(std::string inFile,
642	std::unique_ptr<raw_ostream> OS,
643	DiagnosticsEngine &D,
644	const LangOptions &LOpts,
645	bool silenceMacroWarn, bool LineInfo)
646	: Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
647	SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
648	IsHeader = IsHeaderFile(inFile);
649	RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
650	"rewriting sub-expression within a macro (may not be correct)");
651	// FIXME. This should be an error. But if block is not called, it is OK. And it
652	// may break including some headers.
653	GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
654	"rewriting block literal declared in global scope is not implemented");
655
656	TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
657	DiagnosticsEngine::Warning,
658	"rewriter doesn't support user-specified control flow semantics "
659	"for @try/@finally (code may not execute properly)");
660	}
661
662	std::unique_ptr<ASTConsumer> clang::CreateModernObjCRewriter(
663	const std::string &InFile, std::unique_ptr<raw_ostream> OS,
664	DiagnosticsEngine &Diags, const LangOptions &LOpts,
665	bool SilenceRewriteMacroWarning, bool LineInfo) {
666	return llvm::make_unique<RewriteModernObjC>(InFile, std::move(OS), Diags,
667	LOpts, SilenceRewriteMacroWarning,
668	LineInfo);
669	}
670
671	void RewriteModernObjC::InitializeCommon(ASTContext &context) {
672	Context = &context;
673	SM = &Context->getSourceManager();
674	TUDecl = Context->getTranslationUnitDecl();
675	MsgSendFunctionDecl = nullptr;
676	MsgSendSuperFunctionDecl = nullptr;
677	MsgSendStretFunctionDecl = nullptr;
678	MsgSendSuperStretFunctionDecl = nullptr;
679	MsgSendFpretFunctionDecl = nullptr;
680	GetClassFunctionDecl = nullptr;
681	GetMetaClassFunctionDecl = nullptr;
682	GetSuperClassFunctionDecl = nullptr;
683	SelGetUidFunctionDecl = nullptr;
684	CFStringFunctionDecl = nullptr;
685	ConstantStringClassReference = nullptr;
686	NSStringRecord = nullptr;
687	CurMethodDef = nullptr;
688	CurFunctionDef = nullptr;
689	GlobalVarDecl = nullptr;
690	GlobalConstructionExp = nullptr;
691	SuperStructDecl = nullptr;
692	ProtocolTypeDecl = nullptr;
693	ConstantStringDecl = nullptr;
694	BcLabelCount = 0;
695	SuperConstructorFunctionDecl = nullptr;
696	NumObjCStringLiterals = 0;
697	PropParentMap = nullptr;
698	CurrentBody = nullptr;
699	DisableReplaceStmt = false;
700	objc_impl_method = false;
701
702	// Get the ID and start/end of the main file.
703	MainFileID = SM->getMainFileID();
704	const llvm::MemoryBuffer *MainBuf = SM->getBuffer(MainFileID);
705	MainFileStart = MainBuf->getBufferStart();
706	MainFileEnd = MainBuf->getBufferEnd();
707
708	Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
709	}
710
711	//===----------------------------------------------------------------------===//
712	// Top Level Driver Code
713	//===----------------------------------------------------------------------===//
714
715	void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
716	if (Diags.hasErrorOccurred())
717	return;
718
719	// Two cases: either the decl could be in the main file, or it could be in a
720	// #included file. If the former, rewrite it now. If the later, check to see
721	// if we rewrote the #include/#import.
722	SourceLocation Loc = D->getLocation();
723	Loc = SM->getExpansionLoc(Loc);
724
725	// If this is for a builtin, ignore it.
726	if (Loc.isInvalid()) return;
727
728	// Look for built-in declarations that we need to refer during the rewrite.
729	if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
730	RewriteFunctionDecl(FD);
731	} else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
732	// declared in <Foundation/NSString.h>
733	if (FVD->getName() == "_NSConstantStringClassReference") {
734	ConstantStringClassReference = FVD;
735	return;
736	}
737	} else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
738	RewriteCategoryDecl(CD);
739	} else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
740	if (PD->isThisDeclarationADefinition())
741	RewriteProtocolDecl(PD);
742	} else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
743	// Recurse into linkage specifications
744	for (DeclContext::decl_iterator DI = LSD->decls_begin(),
745	DIEnd = LSD->decls_end();
746	DI != DIEnd; ) {
747	if (ObjCInterfaceDecl IFace = dyn_cast<ObjCInterfaceDecl>((DI))) {
748	if (!IFace->isThisDeclarationADefinition()) {
749	SmallVector<Decl *, 8> DG;
750	SourceLocation StartLoc = IFace->getBeginLoc();
751	do {
752	if (isa<ObjCInterfaceDecl>(*DI) &&
753	!cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
754	StartLoc == (*DI)->getBeginLoc())
755	DG.push_back(*DI);
756	else
757	break;
758
759	++DI;
760	} while (DI != DIEnd);
761	RewriteForwardClassDecl(DG);
762	continue;
763	}
764	else {
765	// Keep track of all interface declarations seen.
766	ObjCInterfacesSeen.push_back(IFace);
767	++DI;
768	continue;
769	}
770	}
771
772	if (ObjCProtocolDecl Proto = dyn_cast<ObjCProtocolDecl>((DI))) {
773	if (!Proto->isThisDeclarationADefinition()) {
774	SmallVector<Decl *, 8> DG;
775	SourceLocation StartLoc = Proto->getBeginLoc();
776	do {
777	if (isa<ObjCProtocolDecl>(*DI) &&
778	!cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
779	StartLoc == (*DI)->getBeginLoc())
780	DG.push_back(*DI);
781	else
782	break;
783
784	++DI;
785	} while (DI != DIEnd);
786	RewriteForwardProtocolDecl(DG);
787	continue;
788	}
789	}
790
791	HandleTopLevelSingleDecl(*DI);
792	++DI;
793	}
794	}
795	// If we have a decl in the main file, see if we should rewrite it.
796	if (SM->isWrittenInMainFile(Loc))
797	return HandleDeclInMainFile(D);
798	}
799
800	//===----------------------------------------------------------------------===//
801	// Syntactic (non-AST) Rewriting Code
802	//===----------------------------------------------------------------------===//
803
804	void RewriteModernObjC::RewriteInclude() {
805	SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
806	StringRef MainBuf = SM->getBufferData(MainFileID);
807	const char *MainBufStart = MainBuf.begin();
808	const char *MainBufEnd = MainBuf.end();
809	size_t ImportLen = strlen("import");
810
811	// Loop over the whole file, looking for includes.
812	for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
813	if (*BufPtr == '#') {
814	if (++BufPtr == MainBufEnd)
815	return;
816	while (BufPtr == ' ' \|\| BufPtr == '\t')
817	if (++BufPtr == MainBufEnd)
818	return;
819	if (!strncmp(BufPtr, "import", ImportLen)) {
820	// replace import with include
821	SourceLocation ImportLoc =
822	LocStart.getLocWithOffset(BufPtr-MainBufStart);
823	ReplaceText(ImportLoc, ImportLen, "include");
824	BufPtr += ImportLen;
825	}
826	}
827	}
828	}
829
830	static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
831	ObjCIvarDecl *IvarDecl, std::string &Result) {
832	Result += "OBJC_IVAR_$_";
833	Result += IDecl->getName();
834	Result += "$";
835	Result += IvarDecl->getName();
836	}
837
838	std::string
839	RewriteModernObjC::getIvarAccessString(ObjCIvarDecl *D) {
840	const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
841
842	// Build name of symbol holding ivar offset.
843	std::string IvarOffsetName;
844	if (D->isBitField())
845	ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
846	else
847	WriteInternalIvarName(ClassDecl, D, IvarOffsetName);
848
849	std::string S = "(*(";
850	QualType IvarT = D->getType();
851	if (D->isBitField())
852	IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
853
854	if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
855	RecordDecl *RD = IvarT->getAs<RecordType>()->getDecl();
856	RD = RD->getDefinition();
857	if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
858	// decltype(((Foo_IMPL)0)->bar)
859	ObjCContainerDecl *CDecl =
860	dyn_cast<ObjCContainerDecl>(D->getDeclContext());
861	// ivar in class extensions requires special treatment.
862	if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
863	CDecl = CatDecl->getClassInterface();
864	std::string RecName = CDecl->getName();
865	RecName += "_IMPL";
866	RecordDecl *RD =
867	RecordDecl::Create(*Context, TTK_Struct, TUDecl, SourceLocation(),
868	SourceLocation(), &Context->Idents.get(RecName));
869	QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
870	unsigned UnsignedIntSize =
871	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
872	Expr Zero = IntegerLiteral::Create(Context,
873	llvm::APInt(UnsignedIntSize, 0),
874	Context->UnsignedIntTy, SourceLocation());
875	Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
876	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
877	Zero);
878	FieldDecl FD = FieldDecl::Create(Context, nullptr, SourceLocation(),
879	SourceLocation(),
880	&Context->Idents.get(D->getNameAsString()),
881	IvarT, nullptr,
882	/BitWidth=/nullptr, /Mutable=/true,
883	ICIS_NoInit);
884	MemberExpr *ME = new (Context)
885	MemberExpr(PE, true, SourceLocation(), FD, SourceLocation(),
886	FD->getType(), VK_LValue, OK_Ordinary);
887	IvarT = Context->getDecltypeType(ME, ME->getType());
888	}
889	}
890	convertObjCTypeToCStyleType(IvarT);
891	QualType castT = Context->getPointerType(IvarT);
892	std::string TypeString(castT.getAsString(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(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	return getter ? !IMP->getInstanceMethod(PD->getGetterName())
914	: !IMP->getInstanceMethod(PD->getSetterName());
915
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(startLoc, "// ");
928	const char *startBuf = SM->getCharacterData(startLoc);
929	assert((*startBuf == '@') && "bogus @synthesize location");
930	const char *semiBuf = strchr(startBuf, ';');
931	assert((*semiBuf == ';') && "@synthesize: can't find ';'");
932	startGetterSetterLoc = startLoc.getLocWithOffset(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(IMD, PD, true /getter/)) {
946	bool GenGetProperty = !(Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) &&
947	(Attributes & (ObjCPropertyDecl::OBJC_PR_retain \|
948	ObjCPropertyDecl::OBJC_PR_copy));
949	std::string Getr;
950	if (GenGetProperty && !objcGetPropertyDefined) {
951	objcGetPropertyDefined = true;
952	// FIXME. Is this attribute correct in all cases?
953	Getr = "\nextern \"C\" __declspec(dllimport) "
954	"id objc_getProperty(id, SEL, long, bool);\n";
955	}
956	RewriteObjCMethodDecl(OID->getContainingInterface(),
957	PD->getGetterMethodDecl(), Getr);
958	Getr += "{ ";
959	// Synthesize an explicit cast to gain access to the ivar.
960	// See objc-act.c:objc_synthesize_new_getter() for details.
961	if (GenGetProperty) {
962	// return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
963	Getr += "typedef ";
964	const FunctionType *FPRetType = nullptr;
965	RewriteTypeIntoString(PD->getGetterMethodDecl()->getReturnType(), Getr,
966	FPRetType);
967	Getr += " _TYPE";
968	if (FPRetType) {
969	Getr += ")"; // close the precedence "scope" for "*".
970
971	// Now, emit the argument types (if any).
972	if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
973	Getr += "(";
974	for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
975	if (i) Getr += ", ";
976	std::string ParamStr =
977	FT->getParamType(i).getAsString(Context->getPrintingPolicy());
978	Getr += ParamStr;
979	}
980	if (FT->isVariadic()) {
981	if (FT->getNumParams())
982	Getr += ", ";
983	Getr += "...";
984	}
985	Getr += ")";
986	} else
987	Getr += "()";
988	}
989	Getr += ";\n";
990	Getr += "return (_TYPE)";
991	Getr += "objc_getProperty(self, _cmd, ";
992	RewriteIvarOffsetComputation(OID, Getr);
993	Getr += ", 1)";
994	}
995	else
996	Getr += "return " + getIvarAccessString(OID);
997	Getr += "; }";
998	InsertText(startGetterSetterLoc, Getr);
999	}
1000
1001	if (PD->isReadOnly() \|\|
1002	!mustSynthesizeSetterGetterMethod(IMD, PD, false /setter/))
1003	return;
1004
1005	// Generate the 'setter' function.
1006	std::string Setr;
1007	bool GenSetProperty = Attributes & (ObjCPropertyDecl::OBJC_PR_retain \|
1008	ObjCPropertyDecl::OBJC_PR_copy);
1009	if (GenSetProperty && !objcSetPropertyDefined) {
1010	objcSetPropertyDefined = true;
1011	// FIXME. Is this attribute correct in all cases?
1012	Setr = "\nextern \"C\" __declspec(dllimport) "
1013	"void objc_setProperty (id, SEL, long, id, bool, bool);\n";
1014	}
1015
1016	RewriteObjCMethodDecl(OID->getContainingInterface(),
1017	PD->getSetterMethodDecl(), Setr);
1018	Setr += "{ ";
1019	// Synthesize an explicit cast to initialize the ivar.
1020	// See objc-act.c:objc_synthesize_new_setter() for details.
1021	if (GenSetProperty) {
1022	Setr += "objc_setProperty (self, _cmd, ";
1023	RewriteIvarOffsetComputation(OID, Setr);
1024	Setr += ", (id)";
1025	Setr += PD->getName();
1026	Setr += ", ";
1027	if (Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic)
1028	Setr += "0, ";
1029	else
1030	Setr += "1, ";
1031	if (Attributes & ObjCPropertyDecl::OBJC_PR_copy)
1032	Setr += "1)";
1033	else
1034	Setr += "0)";
1035	}
1036	else {
1037	Setr += getIvarAccessString(OID) + " = ";
1038	Setr += PD->getName();
1039	}
1040	Setr += "; }\n";
1041	InsertText(startGetterSetterLoc, Setr);
1042	}
1043
1044	static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
1045	std::string &typedefString) {
1046	typedefString += "\n#ifndef _REWRITER_typedef_";
1047	typedefString += ForwardDecl->getNameAsString();
1048	typedefString += "\n";
1049	typedefString += "#define _REWRITER_typedef_";
1050	typedefString += ForwardDecl->getNameAsString();
1051	typedefString += "\n";
1052	typedefString += "typedef struct objc_object ";
1053	typedefString += ForwardDecl->getNameAsString();
1054	// typedef struct { } _objc_exc_Classname;
1055	typedefString += ";\ntypedef struct {} _objc_exc_";
1056	typedefString += ForwardDecl->getNameAsString();
1057	typedefString += ";\n#endif\n";
1058	}
1059
1060	void RewriteModernObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
1061	const std::string &typedefString) {
1062	SourceLocation startLoc = ClassDecl->getBeginLoc();
1063	const char *startBuf = SM->getCharacterData(startLoc);
1064	const char *semiPtr = strchr(startBuf, ';');
1065	// Replace the @class with typedefs corresponding to the classes.
1066	ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
1067	}
1068
1069	void RewriteModernObjC::RewriteForwardClassDecl(DeclGroupRef D) {
1070	std::string typedefString;
1071	for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
1072	if (ObjCInterfaceDecl ForwardDecl = dyn_cast<ObjCInterfaceDecl>(I)) {
1073	if (I == D.begin()) {
1074	// Translate to typedef's that forward reference structs with the same name
1075	// as the class. As a convenience, we include the original declaration
1076	// as a comment.
1077	typedefString += "// @class ";
1078	typedefString += ForwardDecl->getNameAsString();
1079	typedefString += ";";
1080	}
1081	RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1082	}
1083	else
1084	HandleTopLevelSingleDecl(*I);
1085	}
1086	DeclGroupRef::iterator I = D.begin();
1087	RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
1088	}
1089
1090	void RewriteModernObjC::RewriteForwardClassDecl(
1091	const SmallVectorImpl<Decl *> &D) {
1092	std::string typedefString;
1093	for (unsigned i = 0; i < D.size(); i++) {
1094	ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
1095	if (i == 0) {
1096	typedefString += "// @class ";
1097	typedefString += ForwardDecl->getNameAsString();
1098	typedefString += ";";
1099	}
1100	RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1101	}
1102	RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
1103	}
1104
1105	void RewriteModernObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
1106	// When method is a synthesized one, such as a getter/setter there is
1107	// nothing to rewrite.
1108	if (Method->isImplicit())
1109	return;
1110	SourceLocation LocStart = Method->getBeginLoc();
1111	SourceLocation LocEnd = Method->getEndLoc();
1112
1113	if (SM->getExpansionLineNumber(LocEnd) >
1114	SM->getExpansionLineNumber(LocStart)) {
1115	InsertText(LocStart, "#if 0\n");
1116	ReplaceText(LocEnd, 1, ";\n#endif\n");
1117	} else {
1118	InsertText(LocStart, "// ");
1119	}
1120	}
1121
1122	void RewriteModernObjC::RewriteProperty(ObjCPropertyDecl *prop) {
1123	SourceLocation Loc = prop->getAtLoc();
1124
1125	ReplaceText(Loc, 0, "// ");
1126	// FIXME: handle properties that are declared across multiple lines.
1127	}
1128
1129	void RewriteModernObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
1130	SourceLocation LocStart = CatDecl->getBeginLoc();
1131
1132	// FIXME: handle category headers that are declared across multiple lines.
1133	if (CatDecl->getIvarRBraceLoc().isValid()) {
1134	ReplaceText(LocStart, 1, "/** ");
1135	ReplaceText(CatDecl->getIvarRBraceLoc(), 1, "**/ ");
1136	}
1137	else {
1138	ReplaceText(LocStart, 0, "// ");
1139	}
1140
1141	for (auto *I : CatDecl->instance_properties())
1142	RewriteProperty(I);
1143
1144	for (auto *I : CatDecl->instance_methods())
1145	RewriteMethodDeclaration(I);
1146	for (auto *I : CatDecl->class_methods())
1147	RewriteMethodDeclaration(I);
1148
1149	// Lastly, comment out the @end.
1150	ReplaceText(CatDecl->getAtEndRange().getBegin(),
1151	strlen("@end"), "/* @end */\n");
1152	}
1153
1154	void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
1155	SourceLocation LocStart = PDecl->getBeginLoc();
1156	assert(PDecl->isThisDeclarationADefinition());
1157
1158	// FIXME: handle protocol headers that are declared across multiple lines.
1159	ReplaceText(LocStart, 0, "// ");
1160
1161	for (auto *I : PDecl->instance_methods())
1162	RewriteMethodDeclaration(I);
1163	for (auto *I : PDecl->class_methods())
1164	RewriteMethodDeclaration(I);
1165	for (auto *I : PDecl->instance_properties())
1166	RewriteProperty(I);
1167
1168	// Lastly, comment out the @end.
1169	SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
1170	ReplaceText(LocEnd, strlen("@end"), "/* @end */\n");
1171
1172	// Must comment out @optional/@required
1173	const char *startBuf = SM->getCharacterData(LocStart);
1174	const char *endBuf = SM->getCharacterData(LocEnd);
1175	for (const char *p = startBuf; p < endBuf; p++) {
1176	if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
1177	SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1178	ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
1179
1180	}
1181	else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
1182	SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1183	ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
1184
1185	}
1186	}
1187	}
1188
1189	void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
1190	SourceLocation LocStart = (*D.begin())->getBeginLoc();
1191	if (LocStart.isInvalid())
1192	llvm_unreachable("Invalid SourceLocation");
1193	// FIXME: handle forward protocol that are declared across multiple lines.
1194	ReplaceText(LocStart, 0, "// ");
1195	}
1196
1197	void
1198	RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
1199	SourceLocation LocStart = DG[0]->getBeginLoc();
1200	if (LocStart.isInvalid())
1201	llvm_unreachable("Invalid SourceLocation");
1202	// FIXME: handle forward protocol that are declared across multiple lines.
1203	ReplaceText(LocStart, 0, "// ");
1204	}
1205
1206	void RewriteModernObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
1207	const FunctionType *&FPRetType) {
1208	if (T->isObjCQualifiedIdType())
1209	ResultStr += "id";
1210	else if (T->isFunctionPointerType() \|\|
1211	T->isBlockPointerType()) {
1212	// needs special handling, since pointer-to-functions have special
1213	// syntax (where a decaration models use).
1214	QualType retType = T;
1215	QualType PointeeTy;
1216	if (const PointerType* PT = retType->getAs<PointerType>())
1217	PointeeTy = PT->getPointeeType();
1218	else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
1219	PointeeTy = BPT->getPointeeType();
1220	if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
1221	ResultStr +=
1222	FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
1223	ResultStr += "(*";
1224	}
1225	} else
1226	ResultStr += T.getAsString(Context->getPrintingPolicy());
1227	}
1228
1229	void RewriteModernObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
1230	ObjCMethodDecl *OMD,
1231	std::string &ResultStr) {
1232	//fprintf(stderr,"In RewriteObjCMethodDecl\n");
1233	const FunctionType *FPRetType = nullptr;
1234	ResultStr += "\nstatic ";
1235	RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
1236	ResultStr += " ";
1237
1238	// Unique method name
1239	std::string NameStr;
1240
1241	if (OMD->isInstanceMethod())
1242	NameStr += "_I_";
1243	else
1244	NameStr += "_C_";
1245
1246	NameStr += IDecl->getNameAsString();
1247	NameStr += "_";
1248
1249	if (ObjCCategoryImplDecl *CID =
1250	dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
1251	NameStr += CID->getNameAsString();
1252	NameStr += "_";
1253	}
1254	// Append selector names, replacing ':' with '_'
1255	{
1256	std::string selString = OMD->getSelector().getAsString();
1257	int len = selString.size();
1258	for (int i = 0; i < len; i++)
1259	if (selString[i] == ':')
1260	selString[i] = '_';
1261	NameStr += selString;
1262	}
1263	// Remember this name for metadata emission
1264	MethodInternalNames[OMD] = NameStr;
1265	ResultStr += NameStr;
1266
1267	// Rewrite arguments
1268	ResultStr += "(";
1269
1270	// invisible arguments
1271	if (OMD->isInstanceMethod()) {
1272	QualType selfTy = Context->getObjCInterfaceType(IDecl);
1273	selfTy = Context->getPointerType(selfTy);
1274	if (!LangOpts.MicrosoftExt) {
1275	if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
1276	ResultStr += "struct ";
1277	}
1278	// When rewriting for Microsoft, explicitly omit the structure name.
1279	ResultStr += IDecl->getNameAsString();
1280	ResultStr += " *";
1281	}
1282	else
1283	ResultStr += Context->getObjCClassType().getAsString(
1284	Context->getPrintingPolicy());
1285
1286	ResultStr += " self, ";
1287	ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
1288	ResultStr += " _cmd";
1289
1290	// Method arguments.
1291	for (const auto *PDecl : OMD->parameters()) {
1292	ResultStr += ", ";
1293	if (PDecl->getType()->isObjCQualifiedIdType()) {
1294	ResultStr += "id ";
1295	ResultStr += PDecl->getNameAsString();
1296	} else {
1297	std::string Name = PDecl->getNameAsString();
1298	QualType QT = PDecl->getType();
1299	// Make sure we convert "t (^)(...)" to "t (*)(...)".
1300	(void)convertBlockPointerToFunctionPointer(QT);
1301	QT.getAsStringInternal(Name, Context->getPrintingPolicy());
1302	ResultStr += Name;
1303	}
1304	}
1305	if (OMD->isVariadic())
1306	ResultStr += ", ...";
1307	ResultStr += ") ";
1308
1309	if (FPRetType) {
1310	ResultStr += ")"; // close the precedence "scope" for "*".
1311
1312	// Now, emit the argument types (if any).
1313	if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
1314	ResultStr += "(";
1315	for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1316	if (i) ResultStr += ", ";
1317	std::string ParamStr =
1318	FT->getParamType(i).getAsString(Context->getPrintingPolicy());
1319	ResultStr += ParamStr;
1320	}
1321	if (FT->isVariadic()) {
1322	if (FT->getNumParams())
1323	ResultStr += ", ";
1324	ResultStr += "...";
1325	}
1326	ResultStr += ")";
1327	} else {
1328	ResultStr += "()";
1329	}
1330	}
1331	}
1332
1333	void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
1334	ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
1335	ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
1336
1337	if (IMD) {
1338	if (IMD->getIvarRBraceLoc().isValid()) {
1339	ReplaceText(IMD->getBeginLoc(), 1, "/** ");
1340	ReplaceText(IMD->getIvarRBraceLoc(), 1, "**/ ");
1341	}
1342	else {
1343	InsertText(IMD->getBeginLoc(), "// ");
1344	}
1345	}
1346	else
1347	InsertText(CID->getBeginLoc(), "// ");
1348
1349	for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
1350	std::string ResultStr;
1351	RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1352	SourceLocation LocStart = OMD->getBeginLoc();
1353	SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1354
1355	const char *startBuf = SM->getCharacterData(LocStart);
1356	const char *endBuf = SM->getCharacterData(LocEnd);
1357	ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1358	}
1359
1360	for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
1361	std::string ResultStr;
1362	RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1363	SourceLocation LocStart = OMD->getBeginLoc();
1364	SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1365
1366	const char *startBuf = SM->getCharacterData(LocStart);
1367	const char *endBuf = SM->getCharacterData(LocEnd);
1368	ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1369	}
1370	for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
1371	RewritePropertyImplDecl(I, IMD, CID);
1372
1373	InsertText(IMD ? IMD->getEndLoc() : CID->getEndLoc(), "// ");
1374	}
1375
1376	void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
1377	// Do not synthesize more than once.
1378	if (ObjCSynthesizedStructs.count(ClassDecl))
1379	return;
1380	// Make sure super class's are written before current class is written.
1381	ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
1382	while (SuperClass) {
1383	RewriteInterfaceDecl(SuperClass);
1384	SuperClass = SuperClass->getSuperClass();
1385	}
1386	std::string ResultStr;
1387	if (!ObjCWrittenInterfaces.count(ClassDecl->getCanonicalDecl())) {
1388	// we haven't seen a forward decl - generate a typedef.
1389	RewriteOneForwardClassDecl(ClassDecl, ResultStr);
1390	RewriteIvarOffsetSymbols(ClassDecl, ResultStr);
1391
1392	RewriteObjCInternalStruct(ClassDecl, ResultStr);
1393	// Mark this typedef as having been written into its c++ equivalent.
1394	ObjCWrittenInterfaces.insert(ClassDecl->getCanonicalDecl());
1395
1396	for (auto *I : ClassDecl->instance_properties())
1397	RewriteProperty(I);
1398	for (auto *I : ClassDecl->instance_methods())
1399	RewriteMethodDeclaration(I);
1400	for (auto *I : ClassDecl->class_methods())
1401	RewriteMethodDeclaration(I);
1402
1403	// Lastly, comment out the @end.
1404	ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
1405	"/* @end */\n");
1406	}
1407	}
1408
1409	Stmt RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr PseudoOp) {
1410	SourceRange OldRange = PseudoOp->getSourceRange();
1411
1412	// We just magically know some things about the structure of this
1413	// expression.
1414	ObjCMessageExpr *OldMsg =
1415	cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
1416	PseudoOp->getNumSemanticExprs() - 1));
1417
1418	// Because the rewriter doesn't allow us to rewrite rewritten code,
1419	// we need to suppress rewriting the sub-statements.
1420	Expr *Base;
1421	SmallVector<Expr*, 2> Args;
1422	{
1423	DisableReplaceStmtScope S(*this);
1424
1425	// Rebuild the base expression if we have one.
1426	Base = nullptr;
1427	if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1428	Base = OldMsg->getInstanceReceiver();
1429	Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1430	Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1431	}
1432
1433	unsigned numArgs = OldMsg->getNumArgs();
1434	for (unsigned i = 0; i < numArgs; i++) {
1435	Expr *Arg = OldMsg->getArg(i);
1436	if (isa<OpaqueValueExpr>(Arg))
1437	Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1438	Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1439	Args.push_back(Arg);
1440	}
1441	}
1442
1443	// TODO: avoid this copy.
1444	SmallVector<SourceLocation, 1> SelLocs;
1445	OldMsg->getSelectorLocs(SelLocs);
1446
1447	ObjCMessageExpr *NewMsg = nullptr;
1448	switch (OldMsg->getReceiverKind()) {
1449	case ObjCMessageExpr::Class:
1450	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1451	OldMsg->getValueKind(),
1452	OldMsg->getLeftLoc(),
1453	OldMsg->getClassReceiverTypeInfo(),
1454	OldMsg->getSelector(),
1455	SelLocs,
1456	OldMsg->getMethodDecl(),
1457	Args,
1458	OldMsg->getRightLoc(),
1459	OldMsg->isImplicit());
1460	break;
1461
1462	case ObjCMessageExpr::Instance:
1463	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1464	OldMsg->getValueKind(),
1465	OldMsg->getLeftLoc(),
1466	Base,
1467	OldMsg->getSelector(),
1468	SelLocs,
1469	OldMsg->getMethodDecl(),
1470	Args,
1471	OldMsg->getRightLoc(),
1472	OldMsg->isImplicit());
1473	break;
1474
1475	case ObjCMessageExpr::SuperClass:
1476	case ObjCMessageExpr::SuperInstance:
1477	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1478	OldMsg->getValueKind(),
1479	OldMsg->getLeftLoc(),
1480	OldMsg->getSuperLoc(),
1481	OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1482	OldMsg->getSuperType(),
1483	OldMsg->getSelector(),
1484	SelLocs,
1485	OldMsg->getMethodDecl(),
1486	Args,
1487	OldMsg->getRightLoc(),
1488	OldMsg->isImplicit());
1489	break;
1490	}
1491
1492	Stmt *Replacement = SynthMessageExpr(NewMsg);
1493	ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1494	return Replacement;
1495	}
1496
1497	Stmt RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr PseudoOp) {
1498	SourceRange OldRange = PseudoOp->getSourceRange();
1499
1500	// We just magically know some things about the structure of this
1501	// expression.
1502	ObjCMessageExpr *OldMsg =
1503	cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
1504
1505	// Because the rewriter doesn't allow us to rewrite rewritten code,
1506	// we need to suppress rewriting the sub-statements.
1507	Expr *Base = nullptr;
1508	SmallVector<Expr*, 1> Args;
1509	{
1510	DisableReplaceStmtScope S(*this);
1511	// Rebuild the base expression if we have one.
1512	if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1513	Base = OldMsg->getInstanceReceiver();
1514	Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1515	Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1516	}
1517	unsigned numArgs = OldMsg->getNumArgs();
1518	for (unsigned i = 0; i < numArgs; i++) {
1519	Expr *Arg = OldMsg->getArg(i);
1520	if (isa<OpaqueValueExpr>(Arg))
1521	Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1522	Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1523	Args.push_back(Arg);
1524	}
1525	}
1526
1527	// Intentionally empty.
1528	SmallVector<SourceLocation, 1> SelLocs;
1529
1530	ObjCMessageExpr *NewMsg = nullptr;
1531	switch (OldMsg->getReceiverKind()) {
1532	case ObjCMessageExpr::Class:
1533	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1534	OldMsg->getValueKind(),
1535	OldMsg->getLeftLoc(),
1536	OldMsg->getClassReceiverTypeInfo(),
1537	OldMsg->getSelector(),
1538	SelLocs,
1539	OldMsg->getMethodDecl(),
1540	Args,
1541	OldMsg->getRightLoc(),
1542	OldMsg->isImplicit());
1543	break;
1544
1545	case ObjCMessageExpr::Instance:
1546	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1547	OldMsg->getValueKind(),
1548	OldMsg->getLeftLoc(),
1549	Base,
1550	OldMsg->getSelector(),
1551	SelLocs,
1552	OldMsg->getMethodDecl(),
1553	Args,
1554	OldMsg->getRightLoc(),
1555	OldMsg->isImplicit());
1556	break;
1557
1558	case ObjCMessageExpr::SuperClass:
1559	case ObjCMessageExpr::SuperInstance:
1560	NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1561	OldMsg->getValueKind(),
1562	OldMsg->getLeftLoc(),
1563	OldMsg->getSuperLoc(),
1564	OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1565	OldMsg->getSuperType(),
1566	OldMsg->getSelector(),
1567	SelLocs,
1568	OldMsg->getMethodDecl(),
1569	Args,
1570	OldMsg->getRightLoc(),
1571	OldMsg->isImplicit());
1572	break;
1573	}
1574
1575	Stmt *Replacement = SynthMessageExpr(NewMsg);
1576	ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1577	return Replacement;
1578	}
1579
1580	/// SynthCountByEnumWithState - To print:
1581	/// ((NSUInteger (*)
1582	/// (id, SEL, struct __objcFastEnumerationState , id , NSUInteger))
1583	/// (void *)objc_msgSend)((id)l_collection,
1584	/// sel_registerName(
1585	/// "countByEnumeratingWithState:objects:count:"),
1586	/// &enumState,
1587	/// (id *)__rw_items, (NSUInteger)16)
1588	///
1589	void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
1590	buf += "((_WIN_NSUInteger () (id, SEL, struct __objcFastEnumerationState , "
1591	"id , _WIN_NSUInteger))(void )objc_msgSend)";
1592	buf += "\n\t\t";
1593	buf += "((id)l_collection,\n\t\t";
1594	buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
1595	buf += "\n\t\t";
1596	buf += "&enumState, "
1597	"(id *)__rw_items, (_WIN_NSUInteger)16)";
1598	}
1599
1600	/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
1601	/// statement to exit to its outer synthesized loop.
1602	///
1603	Stmt RewriteModernObjC::RewriteBreakStmt(BreakStmt S) {
1604	if (Stmts.empty() \|\| !isa<ObjCForCollectionStmt>(Stmts.back()))
1605	return S;
1606	// replace break with goto __break_label
1607	std::string buf;
1608
1609	SourceLocation startLoc = S->getBeginLoc();
1610	buf = "goto __break_label_";
1611	buf += utostr(ObjCBcLabelNo.back());
1612	ReplaceText(startLoc, strlen("break"), buf);
1613
1614	return nullptr;
1615	}
1616
1617	void RewriteModernObjC::ConvertSourceLocationToLineDirective(
1618	SourceLocation Loc,
1619	std::string &LineString) {
1620	if (Loc.isFileID() && GenerateLineInfo) {
1621	LineString += "\n#line ";
1622	PresumedLoc PLoc = SM->getPresumedLoc(Loc);
1623	LineString += utostr(PLoc.getLine());
1624	LineString += " \"";
1625	LineString += Lexer::Stringify(PLoc.getFilename());
1626	LineString += "\"\n";
1627	}
1628	}
1629
1630	/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
1631	/// statement to continue with its inner synthesized loop.
1632	///
1633	Stmt RewriteModernObjC::RewriteContinueStmt(ContinueStmt S) {
1634	if (Stmts.empty() \|\| !isa<ObjCForCollectionStmt>(Stmts.back()))
1635	return S;
1636	// replace continue with goto __continue_label
1637	std::string buf;
1638
1639	SourceLocation startLoc = S->getBeginLoc();
1640	buf = "goto __continue_label_";
1641	buf += utostr(ObjCBcLabelNo.back());
1642	ReplaceText(startLoc, strlen("continue"), buf);
1643
1644	return nullptr;
1645	}
1646
1647	/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
1648	/// It rewrites:
1649	/// for ( type elem in collection) { stmts; }
1650
1651	/// Into:
1652	/// {
1653	/// type elem;
1654	/// struct __objcFastEnumerationState enumState = { 0 };
1655	/// id __rw_items[16];
1656	/// id l_collection = (id)collection;
1657	/// NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
1658	/// objects:__rw_items count:16];
1659	/// if (limit) {
1660	/// unsigned long startMutations = *enumState.mutationsPtr;
1661	/// do {
1662	/// unsigned long counter = 0;
1663	/// do {
1664	/// if (startMutations != *enumState.mutationsPtr)
1665	/// objc_enumerationMutation(l_collection);
1666	/// elem = (type)enumState.itemsPtr[counter++];
1667	/// stmts;
1668	/// __continue_label: ;
1669	/// } while (counter < limit);
1670	/// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1671	/// objects:__rw_items count:16]));
1672	/// elem = nil;
1673	/// __break_label: ;
1674	/// }
1675	/// else
1676	/// elem = nil;
1677	/// }
1678	///
1679	Stmt RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt S,
1680	SourceLocation OrigEnd) {
1681	assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
1682	assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
1683	"ObjCForCollectionStmt Statement stack mismatch");
1684	assert(!ObjCBcLabelNo.empty() &&
1685	"ObjCForCollectionStmt - Label No stack empty");
1686
1687	SourceLocation startLoc = S->getBeginLoc();
1688	const char *startBuf = SM->getCharacterData(startLoc);
1689	StringRef elementName;
1690	std::string elementTypeAsString;
1691	std::string buf;
1692	// line directive first.
1693	SourceLocation ForEachLoc = S->getForLoc();
1694	ConvertSourceLocationToLineDirective(ForEachLoc, buf);
1695	buf += "{\n\t";
1696	if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
1697	// type elem;
1698	NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
1699	QualType ElementType = cast<ValueDecl>(D)->getType();
1700	if (ElementType->isObjCQualifiedIdType() \|\|
1701	ElementType->isObjCQualifiedInterfaceType())
1702	// Simply use 'id' for all qualified types.
1703	elementTypeAsString = "id";
1704	else
1705	elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
1706	buf += elementTypeAsString;
1707	buf += " ";
1708	elementName = D->getName();
1709	buf += elementName;
1710	buf += ";\n\t";
1711	}
1712	else {
1713	DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
1714	elementName = DR->getDecl()->getName();
1715	ValueDecl *VD = DR->getDecl();
1716	if (VD->getType()->isObjCQualifiedIdType() \|\|
1717	VD->getType()->isObjCQualifiedInterfaceType())
1718	// Simply use 'id' for all qualified types.
1719	elementTypeAsString = "id";
1720	else
1721	elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
1722	}
1723
1724	// struct __objcFastEnumerationState enumState = { 0 };
1725	buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
1726	// id __rw_items[16];
1727	buf += "id __rw_items[16];\n\t";
1728	// id l_collection = (id)
1729	buf += "id l_collection = (id)";
1730	// Find start location of 'collection' the hard way!
1731	const char *startCollectionBuf = startBuf;
1732	startCollectionBuf += 3; // skip 'for'
1733	startCollectionBuf = strchr(startCollectionBuf, '(');
1734	startCollectionBuf++; // skip '('
1735	// find 'in' and skip it.
1736	while (*startCollectionBuf != ' ' \|\|
1737	(startCollectionBuf+1) != 'i' \|\| (startCollectionBuf+2) != 'n' \|\|
1738	(*(startCollectionBuf+3) != ' ' &&
1739	(startCollectionBuf+3) != '[' && (startCollectionBuf+3) != '('))
1740	startCollectionBuf++;
1741	startCollectionBuf += 3;
1742
1743	// Replace: "for (type element in" with string constructed thus far.
1744	ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
1745	// Replace ')' in for '(' type elem in collection ')' with ';'
1746	SourceLocation rightParenLoc = S->getRParenLoc();
1747	const char *rparenBuf = SM->getCharacterData(rightParenLoc);
1748	SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
1749	buf = ";\n\t";
1750
1751	// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
1752	// objects:__rw_items count:16];
1753	// which is synthesized into:
1754	// NSUInteger limit =
1755	// ((NSUInteger (*)
1756	// (id, SEL, struct __objcFastEnumerationState , id , NSUInteger))
1757	// (void *)objc_msgSend)((id)l_collection,
1758	// sel_registerName(
1759	// "countByEnumeratingWithState:objects:count:"),
1760	// (struct __objcFastEnumerationState *)&state,
1761	// (id *)__rw_items, (NSUInteger)16);
1762	buf += "_WIN_NSUInteger limit =\n\t\t";
1763	SynthCountByEnumWithState(buf);
1764	buf += ";\n\t";
1765	/// if (limit) {
1766	/// unsigned long startMutations = *enumState.mutationsPtr;
1767	/// do {
1768	/// unsigned long counter = 0;
1769	/// do {
1770	/// if (startMutations != *enumState.mutationsPtr)
1771	/// objc_enumerationMutation(l_collection);
1772	/// elem = (type)enumState.itemsPtr[counter++];
1773	buf += "if (limit) {\n\t";
1774	buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
1775	buf += "do {\n\t\t";
1776	buf += "unsigned long counter = 0;\n\t\t";
1777	buf += "do {\n\t\t\t";
1778	buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
1779	buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
1780	buf += elementName;
1781	buf += " = (";
1782	buf += elementTypeAsString;
1783	buf += ")enumState.itemsPtr[counter++];";
1784	// Replace ')' in for '(' type elem in collection ')' with all of these.
1785	ReplaceText(lparenLoc, 1, buf);
1786
1787	/// __continue_label: ;
1788	/// } while (counter < limit);
1789	/// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1790	/// objects:__rw_items count:16]));
1791	/// elem = nil;
1792	/// __break_label: ;
1793	/// }
1794	/// else
1795	/// elem = nil;
1796	/// }
1797	///
1798	buf = ";\n\t";
1799	buf += "__continue_label_";
1800	buf += utostr(ObjCBcLabelNo.back());
1801	buf += ": ;";
1802	buf += "\n\t\t";
1803	buf += "} while (counter < limit);\n\t";
1804	buf += "} while ((limit = ";
1805	SynthCountByEnumWithState(buf);
1806	buf += "));\n\t";
1807	buf += elementName;
1808	buf += " = ((";
1809	buf += elementTypeAsString;
1810	buf += ")0);\n\t";
1811	buf += "__break_label_";
1812	buf += utostr(ObjCBcLabelNo.back());
1813	buf += ": ;\n\t";
1814	buf += "}\n\t";
1815	buf += "else\n\t\t";
1816	buf += elementName;
1817	buf += " = ((";
1818	buf += elementTypeAsString;
1819	buf += ")0);\n\t";
1820	buf += "}\n";
1821
1822	// Insert all these after the statement body.
1823	// FIXME: If this should support Obj-C++, support CXXTryStmt
1824	if (isa<CompoundStmt>(S->getBody())) {
1825	SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
1826	InsertText(endBodyLoc, buf);
1827	} else {
1828	/* Need to treat single statements specially. For example:
1829	*
1830	* for (A *a in b) if (stuff()) break;
1831	* for (A *a in b) xxxyy;
1832	*
1833	* The following code simply scans ahead to the semi to find the actual end.
1834	*/
1835	const char *stmtBuf = SM->getCharacterData(OrigEnd);
1836	const char *semiBuf = strchr(stmtBuf, ';');
1837	assert(semiBuf && "Can't find ';'");
1838	SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
1839	InsertText(endBodyLoc, buf);
1840	}
1841	Stmts.pop_back();
1842	ObjCBcLabelNo.pop_back();
1843	return nullptr;
1844	}
1845
1846	static void Write_RethrowObject(std::string &buf) {
1847	buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
1848	buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
1849	buf += "\tid rethrow;\n";
1850	buf += "\t} _fin_force_rethow(_rethrow);";
1851	}
1852
1853	/// RewriteObjCSynchronizedStmt -
1854	/// This routine rewrites @synchronized(expr) stmt;
1855	/// into:
1856	/// objc_sync_enter(expr);
1857	/// @try stmt @finally { objc_sync_exit(expr); }
1858	///
1859	Stmt RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt S) {
1860	// Get the start location and compute the semi location.
1861	SourceLocation startLoc = S->getBeginLoc();
1862	const char *startBuf = SM->getCharacterData(startLoc);
1863
1864	assert((*startBuf == '@') && "bogus @synchronized location");
1865
1866	std::string buf;
1867	SourceLocation SynchLoc = S->getAtSynchronizedLoc();
1868	ConvertSourceLocationToLineDirective(SynchLoc, buf);
1869	buf += "{ id _rethrow = 0; id _sync_obj = (id)";
1870
1871	const char *lparenBuf = startBuf;
1872	while (*lparenBuf != '(') lparenBuf++;
1873	ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
1874
1875	buf = "; objc_sync_enter(_sync_obj);\n";
1876	buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
1877	buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
1878	buf += "\n\tid sync_exit;";
1879	buf += "\n\t} _sync_exit(_sync_obj);\n";
1880
1881	// We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
1882	// the sync expression is typically a message expression that's already
1883	// been rewritten! (which implies the SourceLocation's are invalid).
1884	SourceLocation RParenExprLoc = S->getSynchBody()->getBeginLoc();
1885	const char *RParenExprLocBuf = SM->getCharacterData(RParenExprLoc);
1886	while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
1887	RParenExprLoc = startLoc.getLocWithOffset(RParenExprLocBuf-startBuf);
1888
1889	SourceLocation LBranceLoc = S->getSynchBody()->getBeginLoc();
1890	const char *LBraceLocBuf = SM->getCharacterData(LBranceLoc);
1891	assert (*LBraceLocBuf == '{');
1892	ReplaceText(RParenExprLoc, (LBraceLocBuf - SM->getCharacterData(RParenExprLoc) + 1), buf);
1893
1894	SourceLocation startRBraceLoc = S->getSynchBody()->getEndLoc();
1895	assert((*SM->getCharacterData(startRBraceLoc) == '}') &&
1896	"bogus @synchronized block");
1897
1898	buf = "} catch (id e) {_rethrow = e;}\n";
1899	Write_RethrowObject(buf);
1900	buf += "}\n";
1901	buf += "}\n";
1902
1903	ReplaceText(startRBraceLoc, 1, buf);
1904
1905	return nullptr;
1906	}
1907
1908	void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
1909	{
1910	// Perform a bottom up traversal of all children.
1911	for (Stmt *SubStmt : S->children())
1912	if (SubStmt)
1913	WarnAboutReturnGotoStmts(SubStmt);
1914
1915	if (isa<ReturnStmt>(S) \|\| isa<GotoStmt>(S)) {
1916	Diags.Report(Context->getFullLoc(S->getBeginLoc()),
1917	TryFinallyContainsReturnDiag);
1918	}
1919	}
1920
1921	Stmt RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt S) {
1922	SourceLocation startLoc = S->getAtLoc();
1923	ReplaceText(startLoc, strlen("@autoreleasepool"), "/* @autoreleasepool */");
1924	ReplaceText(S->getSubStmt()->getBeginLoc(), 1,
1925	"{ __AtAutoreleasePool __autoreleasepool; ");
1926
1927	return nullptr;
1928	}
1929
1930	Stmt RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt S) {
1931	ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
1932	bool noCatch = S->getNumCatchStmts() == 0;
1933	std::string buf;
1934	SourceLocation TryLocation = S->getAtTryLoc();
1935	ConvertSourceLocationToLineDirective(TryLocation, buf);
1936
1937	if (finalStmt) {
1938	if (noCatch)
1939	buf += "{ id volatile _rethrow = 0;\n";
1940	else {
1941	buf += "{ id volatile _rethrow = 0;\ntry {\n";
1942	}
1943	}
1944	// Get the start location and compute the semi location.
1945	SourceLocation startLoc = S->getBeginLoc();
1946	const char *startBuf = SM->getCharacterData(startLoc);
1947
1948	assert((*startBuf == '@') && "bogus @try location");
1949	if (finalStmt)
1950	ReplaceText(startLoc, 1, buf);
1951	else
1952	// @try -> try
1953	ReplaceText(startLoc, 1, "");
1954
1955	for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
1956	ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
1957	VarDecl *catchDecl = Catch->getCatchParamDecl();
1958
1959	startLoc = Catch->getBeginLoc();
1960	bool AtRemoved = false;
1961	if (catchDecl) {
1962	QualType t = catchDecl->getType();
1963	if (const ObjCObjectPointerType *Ptr = t->getAs<ObjCObjectPointerType>()) {
1964	// Should be a pointer to a class.
1965	ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
1966	if (IDecl) {
1967	std::string Result;
1968	ConvertSourceLocationToLineDirective(Catch->getBeginLoc(), Result);
1969
1970	startBuf = SM->getCharacterData(startLoc);
1971	assert((*startBuf == '@') && "bogus @catch location");
1972	SourceLocation rParenLoc = Catch->getRParenLoc();
1973	const char *rParenBuf = SM->getCharacterData(rParenLoc);
1974
1975	// _objc_exc_Foo *_e as argument to catch.
1976	Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
1977	Result += " *_"; Result += catchDecl->getNameAsString();
1978	Result += ")";
1979	ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
1980	// Foo e = (Foo )_e;
1981	Result.clear();
1982	Result = "{ ";
1983	Result += IDecl->getNameAsString();
1984	Result += " *"; Result += catchDecl->getNameAsString();
1985	Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
1986	Result += "_"; Result += catchDecl->getNameAsString();
1987
1988	Result += "; ";
1989	SourceLocation lBraceLoc = Catch->getCatchBody()->getBeginLoc();
1990	ReplaceText(lBraceLoc, 1, Result);
1991	AtRemoved = true;
1992	}
1993	}
1994	}
1995	if (!AtRemoved)
1996	// @catch -> catch
1997	ReplaceText(startLoc, 1, "");
1998
1999	}
2000	if (finalStmt) {
2001	buf.clear();
2002	SourceLocation FinallyLoc = finalStmt->getBeginLoc();
2003
2004	if (noCatch) {
2005	ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2006	buf += "catch (id e) {_rethrow = e;}\n";
2007	}
2008	else {
2009	buf += "}\n";
2010	ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2011	buf += "catch (id e) {_rethrow = e;}\n";
2012	}
2013
2014	SourceLocation startFinalLoc = finalStmt->getBeginLoc();
2015	ReplaceText(startFinalLoc, 8, buf);
2016	Stmt *body = finalStmt->getFinallyBody();
2017	SourceLocation startFinalBodyLoc = body->getBeginLoc();
2018	buf.clear();
2019	Write_RethrowObject(buf);
2020	ReplaceText(startFinalBodyLoc, 1, buf);
2021
2022	SourceLocation endFinalBodyLoc = body->getEndLoc();
2023	ReplaceText(endFinalBodyLoc, 1, "}\n}");
2024	// Now check for any return/continue/go statements within the @try.
2025	WarnAboutReturnGotoStmts(S->getTryBody());
2026	}
2027
2028	return nullptr;
2029	}
2030
2031	// This can't be done with ReplaceStmt(S, ThrowExpr), since
2032	// the throw expression is typically a message expression that's already
2033	// been rewritten! (which implies the SourceLocation's are invalid).
2034	Stmt RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt S) {
2035	// Get the start location and compute the semi location.
2036	SourceLocation startLoc = S->getBeginLoc();
2037	const char *startBuf = SM->getCharacterData(startLoc);
2038
2039	assert((*startBuf == '@') && "bogus @throw location");
2040
2041	std::string buf;
2042	/* void objc_exception_throw(id) __attribute__((noreturn)); */
2043	if (S->getThrowExpr())
2044	buf = "objc_exception_throw(";
2045	else
2046	buf = "throw";
2047
2048	// handle "@ throw" correctly.
2049	const char *wBuf = strchr(startBuf, 'w');
2050	assert((*wBuf == 'w') && "@throw: can't find 'w'");
2051	ReplaceText(startLoc, wBuf-startBuf+1, buf);
2052
2053	SourceLocation endLoc = S->getEndLoc();
2054	const char *endBuf = SM->getCharacterData(endLoc);
2055	const char *semiBuf = strchr(endBuf, ';');
2056	assert((*semiBuf == ';') && "@throw: can't find ';'");
2057	SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
2058	if (S->getThrowExpr())
2059	ReplaceText(semiLoc, 1, ");");
2060	return nullptr;
2061	}
2062
2063	Stmt RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr Exp) {
2064	// Create a new string expression.
2065	std::string StrEncoding;
2066	Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
2067	Expr *Replacement = getStringLiteral(StrEncoding);
2068	ReplaceStmt(Exp, Replacement);
2069
2070	// Replace this subexpr in the parent.
2071	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2072	return Replacement;
2073	}
2074
2075	Stmt RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr Exp) {
2076	if (!SelGetUidFunctionDecl)
2077	SynthSelGetUidFunctionDecl();
2078	assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
2079	// Create a call to sel_registerName("selName").
2080	SmallVector<Expr*, 8> SelExprs;
2081	SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
2082	CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2083	SelExprs);
2084	ReplaceStmt(Exp, SelExp);
2085	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2086	return SelExp;
2087	}
2088
2089	CallExpr *
2090	RewriteModernObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
2091	ArrayRef<Expr *> Args,
2092	SourceLocation StartLoc,
2093	SourceLocation EndLoc) {
2094	// Get the type, we will need to reference it in a couple spots.
2095	QualType msgSendType = FD->getType();
2096
2097	// Create a reference to the objc_msgSend() declaration.
2098	DeclRefExpr DRE = new (Context) DeclRefExpr(Context, FD, false, msgSendType,
2099	VK_LValue, SourceLocation());
2100
2101	// Now, we cast the reference to a pointer to the objc_msgSend type.
2102	QualType pToFunc = Context->getPointerType(msgSendType);
2103	ImplicitCastExpr *ICE =
2104	ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
2105	DRE, nullptr, VK_RValue);
2106
2107	const FunctionType *FT = msgSendType->getAs<FunctionType>();
2108
2109	CallExpr *Exp = CallExpr::Create(
2110	Context, ICE, Args, FT->getCallResultType(Context), VK_RValue, EndLoc);
2111	return Exp;
2112	}
2113
2114	static bool scanForProtocolRefs(const char startBuf, const char endBuf,
2115	const char &startRef, const char &endRef) {
2116	while (startBuf < endBuf) {
2117	if (*startBuf == '<')
2118	startRef = startBuf; // mark the start.
2119	if (*startBuf == '>') {
2120	if (startRef && *startRef == '<') {
2121	endRef = startBuf; // mark the end.
2122	return true;
2123	}
2124	return false;
2125	}
2126	startBuf++;
2127	}
2128	return false;
2129	}
2130
2131	static void scanToNextArgument(const char *&argRef) {
2132	int angle = 0;
2133	while (argRef != ')' && (argRef != ',' \|\| angle > 0)) {
2134	if (*argRef == '<')
2135	angle++;
2136	else if (*argRef == '>')
2137	angle--;
2138	argRef++;
2139	}
2140	assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
2141	}
2142
2143	bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
2144	if (T->isObjCQualifiedIdType())
2145	return true;
2146	if (const PointerType *PT = T->getAs<PointerType>()) {
2147	if (PT->getPointeeType()->isObjCQualifiedIdType())
2148	return true;
2149	}
2150	if (T->isObjCObjectPointerType()) {
2151	T = T->getPointeeType();
2152	return T->isObjCQualifiedInterfaceType();
2153	}
2154	if (T->isArrayType()) {
2155	QualType ElemTy = Context->getBaseElementType(T);
2156	return needToScanForQualifiers(ElemTy);
2157	}
2158	return false;
2159	}
2160
2161	void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
2162	QualType Type = E->getType();
2163	if (needToScanForQualifiers(Type)) {
2164	SourceLocation Loc, EndLoc;
2165
2166	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
2167	Loc = ECE->getLParenLoc();
2168	EndLoc = ECE->getRParenLoc();
2169	} else {
2170	Loc = E->getBeginLoc();
2171	EndLoc = E->getEndLoc();
2172	}
2173	// This will defend against trying to rewrite synthesized expressions.
2174	if (Loc.isInvalid() \|\| EndLoc.isInvalid())
2175	return;
2176
2177	const char *startBuf = SM->getCharacterData(Loc);
2178	const char *endBuf = SM->getCharacterData(EndLoc);
2179	const char startRef = nullptr, endRef = nullptr;
2180	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2181	// Get the locations of the startRef, endRef.
2182	SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
2183	SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
2184	// Comment out the protocol references.
2185	InsertText(LessLoc, "/*");
2186	InsertText(GreaterLoc, "*/");
2187	}
2188	}
2189	}
2190
2191	void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
2192	SourceLocation Loc;
2193	QualType Type;
2194	const FunctionProtoType *proto = nullptr;
2195	if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
2196	Loc = VD->getLocation();
2197	Type = VD->getType();
2198	}
2199	else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
2200	Loc = FD->getLocation();
2201	// Check for ObjC 'id' and class types that have been adorned with protocol
2202	// information (id<p>, C<p>*). The protocol references need to be rewritten!
2203	const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2204	assert(funcType && "missing function type");
2205	proto = dyn_cast<FunctionProtoType>(funcType);
2206	if (!proto)
2207	return;
2208	Type = proto->getReturnType();
2209	}
2210	else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
2211	Loc = FD->getLocation();
2212	Type = FD->getType();
2213	}
2214	else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Dcl)) {
2215	Loc = TD->getLocation();
2216	Type = TD->getUnderlyingType();
2217	}
2218	else
2219	return;
2220
2221	if (needToScanForQualifiers(Type)) {
2222	// Since types are unique, we need to scan the buffer.
2223
2224	const char *endBuf = SM->getCharacterData(Loc);
2225	const char *startBuf = endBuf;
2226	while (startBuf != ';' && startBuf != '<' && startBuf != MainFileStart)
2227	startBuf--; // scan backward (from the decl location) for return type.
2228	const char startRef = nullptr, endRef = nullptr;
2229	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2230	// Get the locations of the startRef, endRef.
2231	SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
2232	SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
2233	// Comment out the protocol references.
2234	InsertText(LessLoc, "/*");
2235	InsertText(GreaterLoc, "*/");
2236	}
2237	}
2238	if (!proto)
2239	return; // most likely, was a variable
2240	// Now check arguments.
2241	const char *startBuf = SM->getCharacterData(Loc);
2242	const char *startFuncBuf = startBuf;
2243	for (unsigned i = 0; i < proto->getNumParams(); i++) {
2244	if (needToScanForQualifiers(proto->getParamType(i))) {
2245	// Since types are unique, we need to scan the buffer.
2246
2247	const char *endBuf = startBuf;
2248	// scan forward (from the decl location) for argument types.
2249	scanToNextArgument(endBuf);
2250	const char startRef = nullptr, endRef = nullptr;
2251	if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2252	// Get the locations of the startRef, endRef.
2253	SourceLocation LessLoc =
2254	Loc.getLocWithOffset(startRef-startFuncBuf);
2255	SourceLocation GreaterLoc =
2256	Loc.getLocWithOffset(endRef-startFuncBuf+1);
2257	// Comment out the protocol references.
2258	InsertText(LessLoc, "/*");
2259	InsertText(GreaterLoc, "*/");
2260	}
2261	startBuf = ++endBuf;
2262	}
2263	else {
2264	// If the function name is derived from a macro expansion, then the
2265	// argument buffer will not follow the name. Need to speak with Chris.
2266	while (startBuf && startBuf != ')' && *startBuf != ',')
2267	startBuf++; // scan forward (from the decl location) for argument types.
2268	startBuf++;
2269	}
2270	}
2271	}
2272
2273	void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
2274	QualType QT = ND->getType();
2275	const Type* TypePtr = QT->getAs<Type>();
2276	if (!isa<TypeOfExprType>(TypePtr))
2277	return;
2278	while (isa<TypeOfExprType>(TypePtr)) {
2279	const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
2280	QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
2281	TypePtr = QT->getAs<Type>();
2282	}
2283	// FIXME. This will not work for multiple declarators; as in:
2284	// __typeof__(a) b,c,d;
2285	std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
2286	SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
2287	const char *startBuf = SM->getCharacterData(DeclLoc);
2288	if (ND->getInit()) {
2289	std::string Name(ND->getNameAsString());
2290	TypeAsString += " " + Name + " = ";
2291	Expr *E = ND->getInit();
2292	SourceLocation startLoc;
2293	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
2294	startLoc = ECE->getLParenLoc();
2295	else
2296	startLoc = E->getBeginLoc();
2297	startLoc = SM->getExpansionLoc(startLoc);
2298	const char *endBuf = SM->getCharacterData(startLoc);
2299	ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2300	}
2301	else {
2302	SourceLocation X = ND->getEndLoc();
2303	X = SM->getExpansionLoc(X);
2304	const char *endBuf = SM->getCharacterData(X);
2305	ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2306	}
2307	}
2308
2309	// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
2310	void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
2311	IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
2312	SmallVector<QualType, 16> ArgTys;
2313	ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2314	QualType getFuncType =
2315	getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
2316	SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2317	SourceLocation(),
2318	SourceLocation(),
2319	SelGetUidIdent, getFuncType,
2320	nullptr, SC_Extern);
2321	}
2322
2323	void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
2324	// declared in <objc/objc.h>
2325	if (FD->getIdentifier() &&
2326	FD->getName() == "sel_registerName") {
2327	SelGetUidFunctionDecl = FD;
2328	return;
2329	}
2330	RewriteObjCQualifiedInterfaceTypes(FD);
2331	}
2332
2333	void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
2334	std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2335	const char *argPtr = TypeString.c_str();
2336	if (!strchr(argPtr, '^')) {
2337	Str += TypeString;
2338	return;
2339	}
2340	while (*argPtr) {
2341	Str += (argPtr == '^' ? '' : *argPtr);
2342	argPtr++;
2343	}
2344	}
2345
2346	// FIXME. Consolidate this routine with RewriteBlockPointerType.
2347	void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
2348	ValueDecl *VD) {
2349	QualType Type = VD->getType();
2350	std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2351	const char *argPtr = TypeString.c_str();
2352	int paren = 0;
2353	while (*argPtr) {
2354	switch (*argPtr) {
2355	case '(':
2356	Str += *argPtr;
2357	paren++;
2358	break;
2359	case ')':
2360	Str += *argPtr;
2361	paren--;
2362	break;
2363	case '^':
2364	Str += '*';
2365	if (paren == 1)
2366	Str += VD->getNameAsString();
2367	break;
2368	default:
2369	Str += *argPtr;
2370	break;
2371	}
2372	argPtr++;
2373	}
2374	}
2375
2376	void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
2377	SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
2378	const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2379	const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
2380	if (!proto)
2381	return;
2382	QualType Type = proto->getReturnType();
2383	std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
2384	FdStr += " ";
2385	FdStr += FD->getName();
2386	FdStr += "(";
2387	unsigned numArgs = proto->getNumParams();
2388	for (unsigned i = 0; i < numArgs; i++) {
2389	QualType ArgType = proto->getParamType(i);
2390	RewriteBlockPointerType(FdStr, ArgType);
2391	if (i+1 < numArgs)
2392	FdStr += ", ";
2393	}
2394	if (FD->isVariadic()) {
2395	FdStr += (numArgs > 0) ? ", ...);\n" : "...);\n";
2396	}
2397	else
2398	FdStr += ");\n";
2399	InsertText(FunLocStart, FdStr);
2400	}
2401
2402	// SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
2403	void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
2404	if (SuperConstructorFunctionDecl)
2405	return;
2406	IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
2407	SmallVector<QualType, 16> ArgTys;
2408	QualType argT = Context->getObjCIdType();
2409	assert(!argT.isNull() && "Can't find 'id' type");
2410	ArgTys.push_back(argT);
2411	ArgTys.push_back(argT);
2412	QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2413	ArgTys);
2414	SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2415	SourceLocation(),
2416	SourceLocation(),
2417	msgSendIdent, msgSendType,
2418	nullptr, SC_Extern);
2419	}
2420
2421	// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
2422	void RewriteModernObjC::SynthMsgSendFunctionDecl() {
2423	IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
2424	SmallVector<QualType, 16> ArgTys;
2425	QualType argT = Context->getObjCIdType();
2426	assert(!argT.isNull() && "Can't find 'id' type");
2427	ArgTys.push_back(argT);
2428	argT = Context->getObjCSelType();
2429	assert(!argT.isNull() && "Can't find 'SEL' type");
2430	ArgTys.push_back(argT);
2431	QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2432	ArgTys, /isVariadic=/true);
2433	MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2434	SourceLocation(),
2435	SourceLocation(),
2436	msgSendIdent, msgSendType, nullptr,
2437	SC_Extern);
2438	}
2439
2440	// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
2441	void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
2442	IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
2443	SmallVector<QualType, 2> ArgTys;
2444	ArgTys.push_back(Context->VoidTy);
2445	QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2446	ArgTys, /isVariadic=/true);
2447	MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2448	SourceLocation(),
2449	SourceLocation(),
2450	msgSendIdent, msgSendType,
2451	nullptr, SC_Extern);
2452	}
2453
2454	// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
2455	void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
2456	IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
2457	SmallVector<QualType, 16> ArgTys;
2458	QualType argT = Context->getObjCIdType();
2459	assert(!argT.isNull() && "Can't find 'id' type");
2460	ArgTys.push_back(argT);
2461	argT = Context->getObjCSelType();
2462	assert(!argT.isNull() && "Can't find 'SEL' type");
2463	ArgTys.push_back(argT);
2464	QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2465	ArgTys, /isVariadic=/true);
2466	MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2467	SourceLocation(),
2468	SourceLocation(),
2469	msgSendIdent, msgSendType,
2470	nullptr, SC_Extern);
2471	}
2472
2473	// SynthMsgSendSuperStretFunctionDecl -
2474	// id objc_msgSendSuper_stret(void);
2475	void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
2476	IdentifierInfo *msgSendIdent =
2477	&Context->Idents.get("objc_msgSendSuper_stret");
2478	SmallVector<QualType, 2> ArgTys;
2479	ArgTys.push_back(Context->VoidTy);
2480	QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2481	ArgTys, /isVariadic=/true);
2482	MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2483	SourceLocation(),
2484	SourceLocation(),
2485	msgSendIdent,
2486	msgSendType, nullptr,
2487	SC_Extern);
2488	}
2489
2490	// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
2491	void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
2492	IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
2493	SmallVector<QualType, 16> ArgTys;
2494	QualType argT = Context->getObjCIdType();
2495	assert(!argT.isNull() && "Can't find 'id' type");
2496	ArgTys.push_back(argT);
2497	argT = Context->getObjCSelType();
2498	assert(!argT.isNull() && "Can't find 'SEL' type");
2499	ArgTys.push_back(argT);
2500	QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
2501	ArgTys, /isVariadic=/true);
2502	MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2503	SourceLocation(),
2504	SourceLocation(),
2505	msgSendIdent, msgSendType,
2506	nullptr, SC_Extern);
2507	}
2508
2509	// SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
2510	void RewriteModernObjC::SynthGetClassFunctionDecl() {
2511	IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
2512	SmallVector<QualType, 16> ArgTys;
2513	ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2514	QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2515	ArgTys);
2516	GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2517	SourceLocation(),
2518	SourceLocation(),
2519	getClassIdent, getClassType,
2520	nullptr, SC_Extern);
2521	}
2522
2523	// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
2524	void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
2525	IdentifierInfo *getSuperClassIdent =
2526	&Context->Idents.get("class_getSuperclass");
2527	SmallVector<QualType, 16> ArgTys;
2528	ArgTys.push_back(Context->getObjCClassType());
2529	QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2530	ArgTys);
2531	GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2532	SourceLocation(),
2533	SourceLocation(),
2534	getSuperClassIdent,
2535	getClassType, nullptr,
2536	SC_Extern);
2537	}
2538
2539	// SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
2540	void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
2541	IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
2542	SmallVector<QualType, 16> ArgTys;
2543	ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2544	QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2545	ArgTys);
2546	GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2547	SourceLocation(),
2548	SourceLocation(),
2549	getClassIdent, getClassType,
2550	nullptr, SC_Extern);
2551	}
2552
2553	Stmt RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral Exp) {
2554	assert (Exp != nullptr && "Expected non-null ObjCStringLiteral");
2555	QualType strType = getConstantStringStructType();
2556
2557	std::string S = "__NSConstantStringImpl_";
2558
2559	std::string tmpName = InFileName;
2560	unsigned i;
2561	for (i=0; i < tmpName.length(); i++) {
2562	char c = tmpName.at(i);
2563	// replace any non-alphanumeric characters with '_'.
2564	if (!isAlphanumeric(c))
2565	tmpName[i] = '_';
2566	}
2567	S += tmpName;
2568	S += "_";
2569	S += utostr(NumObjCStringLiterals++);
2570
2571	Preamble += "static __NSConstantStringImpl " + S;
2572	Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
2573	Preamble += "0x000007c8,"; // utf8_str
2574	// The pretty printer for StringLiteral handles escape characters properly.
2575	std::string prettyBufS;
2576	llvm::raw_string_ostream prettyBuf(prettyBufS);
2577	Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
2578	Preamble += prettyBuf.str();
2579	Preamble += ",";
2580	Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
2581
2582	VarDecl NewVD = VarDecl::Create(Context, TUDecl, SourceLocation(),
2583	SourceLocation(), &Context->Idents.get(S),
2584	strType, nullptr, SC_Static);
2585	DeclRefExpr *DRE = new (Context)
2586	DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
2587	Expr *Unop = new (Context)
2588	UnaryOperator(DRE, UO_AddrOf, Context->getPointerType(DRE->getType()),
2589	VK_RValue, OK_Ordinary, SourceLocation(), false);
2590	// cast to NSConstantString *
2591	CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
2592	CK_CPointerToObjCPointerCast, Unop);
2593	ReplaceStmt(Exp, cast);
2594	// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2595	return cast;
2596	}
2597
2598	Stmt RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr Exp) {
2599	unsigned IntSize =
2600	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
2601
2602	Expr FlagExp = IntegerLiteral::Create(Context,
2603	llvm::APInt(IntSize, Exp->getValue()),
2604	Context->IntTy, Exp->getLocation());
2605	CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Context->ObjCBuiltinBoolTy,
2606	CK_BitCast, FlagExp);
2607	ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
2608	cast);
2609	ReplaceStmt(Exp, PE);
2610	return PE;
2611	}
2612
2613	Stmt RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr Exp) {
2614	// synthesize declaration of helper functions needed in this routine.
2615	if (!SelGetUidFunctionDecl)
2616	SynthSelGetUidFunctionDecl();
2617	// use objc_msgSend() for all.
2618	if (!MsgSendFunctionDecl)
2619	SynthMsgSendFunctionDecl();
2620	if (!GetClassFunctionDecl)
2621	SynthGetClassFunctionDecl();
2622
2623	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2624	SourceLocation StartLoc = Exp->getBeginLoc();
2625	SourceLocation EndLoc = Exp->getEndLoc();
2626
2627	// Synthesize a call to objc_msgSend().
2628	SmallVector<Expr*, 4> MsgExprs;
2629	SmallVector<Expr*, 4> ClsExprs;
2630
2631	// Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
2632	ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
2633	ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
2634
2635	IdentifierInfo *clsName = BoxingClass->getIdentifier();
2636	ClsExprs.push_back(getStringLiteral(clsName->getName()));
2637	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2638	StartLoc, EndLoc);
2639	MsgExprs.push_back(Cls);
2640
2641	// Create a call to sel_registerName("<BoxingMethod>:"), etc.
2642	// it will be the 2nd argument.
2643	SmallVector<Expr*, 4> SelExprs;
2644	SelExprs.push_back(
2645	getStringLiteral(BoxingMethod->getSelector().getAsString()));
2646	CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2647	SelExprs, StartLoc, EndLoc);
2648	MsgExprs.push_back(SelExp);
2649
2650	// User provided sub-expression is the 3rd, and last, argument.
2651	Expr *subExpr = Exp->getSubExpr();
2652	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(subExpr)) {
2653	QualType type = ICE->getType();
2654	const Expr *SubExpr = ICE->IgnoreParenImpCasts();
2655	CastKind CK = CK_BitCast;
2656	if (SubExpr->getType()->isIntegralType(*Context) && type->isBooleanType())
2657	CK = CK_IntegralToBoolean;
2658	subExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, subExpr);
2659	}
2660	MsgExprs.push_back(subExpr);
2661
2662	SmallVector<QualType, 4> ArgTypes;
2663	ArgTypes.push_back(Context->getObjCClassType());
2664	ArgTypes.push_back(Context->getObjCSelType());
2665	for (const auto PI : BoxingMethod->parameters())
2666	ArgTypes.push_back(PI->getType());
2667
2668	QualType returnType = Exp->getType();
2669	// Get the type, we will need to reference it in a couple spots.
2670	QualType msgSendType = MsgSendFlavor->getType();
2671
2672	// Create a reference to the objc_msgSend() declaration.
2673	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2674	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2675
2676	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2677	Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2678
2679	// Now do the "normal" pointer to function cast.
2680	QualType castType =
2681	getSimpleFunctionType(returnType, ArgTypes, BoxingMethod->isVariadic());
2682	castType = Context->getPointerType(castType);
2683	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2684	cast);
2685
2686	// Don't forget the parens to enforce the proper binding.
2687	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2688
2689	const FunctionType *FT = msgSendType->getAs<FunctionType>();
2690	CallExpr CE = CallExpr::Create(Context, PE, MsgExprs, FT->getReturnType(),
2691	VK_RValue, EndLoc);
2692	ReplaceStmt(Exp, CE);
2693	return CE;
2694	}
2695
2696	Stmt RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral Exp) {
2697	// synthesize declaration of helper functions needed in this routine.
2698	if (!SelGetUidFunctionDecl)
2699	SynthSelGetUidFunctionDecl();
2700	// use objc_msgSend() for all.
2701	if (!MsgSendFunctionDecl)
2702	SynthMsgSendFunctionDecl();
2703	if (!GetClassFunctionDecl)
2704	SynthGetClassFunctionDecl();
2705
2706	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2707	SourceLocation StartLoc = Exp->getBeginLoc();
2708	SourceLocation EndLoc = Exp->getEndLoc();
2709
2710	// Build the expression: __NSContainer_literal(int, ...).arr
2711	QualType IntQT = Context->IntTy;
2712	QualType NSArrayFType =
2713	getSimpleFunctionType(Context->VoidTy, IntQT, true);
2714	std::string NSArrayFName("__NSContainer_literal");
2715	FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(NSArrayFName);
2716	DeclRefExpr *NSArrayDRE = new (Context) DeclRefExpr(
2717	*Context, NSArrayFD, false, NSArrayFType, VK_RValue, SourceLocation());
2718
2719	SmallVector<Expr*, 16> InitExprs;
2720	unsigned NumElements = Exp->getNumElements();
2721	unsigned UnsignedIntSize =
2722	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2723	Expr count = IntegerLiteral::Create(Context,
2724	llvm::APInt(UnsignedIntSize, NumElements),
2725	Context->UnsignedIntTy, SourceLocation());
2726	InitExprs.push_back(count);
2727	for (unsigned i = 0; i < NumElements; i++)
2728	InitExprs.push_back(Exp->getElement(i));
2729	Expr *NSArrayCallExpr =
2730	CallExpr::Create(*Context, NSArrayDRE, InitExprs, NSArrayFType, VK_LValue,
2731	SourceLocation());
2732
2733	FieldDecl ARRFD = FieldDecl::Create(Context, nullptr, SourceLocation(),
2734	SourceLocation(),
2735	&Context->Idents.get("arr"),
2736	Context->getPointerType(Context->VoidPtrTy),
2737	nullptr, /BitWidth=/nullptr,
2738	/Mutable=/true, ICIS_NoInit);
2739	MemberExpr *ArrayLiteralME = new (Context)
2740	MemberExpr(NSArrayCallExpr, false, SourceLocation(), ARRFD,
2741	SourceLocation(), ARRFD->getType(), VK_LValue, OK_Ordinary);
2742	QualType ConstIdT = Context->getObjCIdType().withConst();
2743	CStyleCastExpr * ArrayLiteralObjects =
2744	NoTypeInfoCStyleCastExpr(Context,
2745	Context->getPointerType(ConstIdT),
2746	CK_BitCast,
2747	ArrayLiteralME);
2748
2749	// Synthesize a call to objc_msgSend().
2750	SmallVector<Expr*, 32> MsgExprs;
2751	SmallVector<Expr*, 4> ClsExprs;
2752	QualType expType = Exp->getType();
2753
2754	// Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2755	ObjCInterfaceDecl *Class =
2756	expType->getPointeeType()->getAs<ObjCObjectType>()->getInterface();
2757
2758	IdentifierInfo *clsName = Class->getIdentifier();
2759	ClsExprs.push_back(getStringLiteral(clsName->getName()));
2760	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2761	StartLoc, EndLoc);
2762	MsgExprs.push_back(Cls);
2763
2764	// Create a call to sel_registerName("arrayWithObjects:count:").
2765	// it will be the 2nd argument.
2766	SmallVector<Expr*, 4> SelExprs;
2767	ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
2768	SelExprs.push_back(
2769	getStringLiteral(ArrayMethod->getSelector().getAsString()));
2770	CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2771	SelExprs, StartLoc, EndLoc);
2772	MsgExprs.push_back(SelExp);
2773
2774	// (const id [])objects
2775	MsgExprs.push_back(ArrayLiteralObjects);
2776
2777	// (NSUInteger)cnt
2778	Expr cnt = IntegerLiteral::Create(Context,
2779	llvm::APInt(UnsignedIntSize, NumElements),
2780	Context->UnsignedIntTy, SourceLocation());
2781	MsgExprs.push_back(cnt);
2782
2783	SmallVector<QualType, 4> ArgTypes;
2784	ArgTypes.push_back(Context->getObjCClassType());
2785	ArgTypes.push_back(Context->getObjCSelType());
2786	for (const auto *PI : ArrayMethod->parameters())
2787	ArgTypes.push_back(PI->getType());
2788
2789	QualType returnType = Exp->getType();
2790	// Get the type, we will need to reference it in a couple spots.
2791	QualType msgSendType = MsgSendFlavor->getType();
2792
2793	// Create a reference to the objc_msgSend() declaration.
2794	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2795	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2796
2797	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2798	Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2799
2800	// Now do the "normal" pointer to function cast.
2801	QualType castType =
2802	getSimpleFunctionType(returnType, ArgTypes, ArrayMethod->isVariadic());
2803	castType = Context->getPointerType(castType);
2804	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2805	cast);
2806
2807	// Don't forget the parens to enforce the proper binding.
2808	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2809
2810	const FunctionType *FT = msgSendType->getAs<FunctionType>();
2811	CallExpr CE = CallExpr::Create(Context, PE, MsgExprs, FT->getReturnType(),
2812	VK_RValue, EndLoc);
2813	ReplaceStmt(Exp, CE);
2814	return CE;
2815	}
2816
2817	Stmt RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral Exp) {
2818	// synthesize declaration of helper functions needed in this routine.
2819	if (!SelGetUidFunctionDecl)
2820	SynthSelGetUidFunctionDecl();
2821	// use objc_msgSend() for all.
2822	if (!MsgSendFunctionDecl)
2823	SynthMsgSendFunctionDecl();
2824	if (!GetClassFunctionDecl)
2825	SynthGetClassFunctionDecl();
2826
2827	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2828	SourceLocation StartLoc = Exp->getBeginLoc();
2829	SourceLocation EndLoc = Exp->getEndLoc();
2830
2831	// Build the expression: __NSContainer_literal(int, ...).arr
2832	QualType IntQT = Context->IntTy;
2833	QualType NSDictFType =
2834	getSimpleFunctionType(Context->VoidTy, IntQT, true);
2835	std::string NSDictFName("__NSContainer_literal");
2836	FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(NSDictFName);
2837	DeclRefExpr *NSDictDRE = new (Context) DeclRefExpr(
2838	*Context, NSDictFD, false, NSDictFType, VK_RValue, SourceLocation());
2839
2840	SmallVector<Expr*, 16> KeyExprs;
2841	SmallVector<Expr*, 16> ValueExprs;
2842
2843	unsigned NumElements = Exp->getNumElements();
2844	unsigned UnsignedIntSize =
2845	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2846	Expr count = IntegerLiteral::Create(Context,
2847	llvm::APInt(UnsignedIntSize, NumElements),
2848	Context->UnsignedIntTy, SourceLocation());
2849	KeyExprs.push_back(count);
2850	ValueExprs.push_back(count);
2851	for (unsigned i = 0; i < NumElements; i++) {
2852	ObjCDictionaryElement Element = Exp->getKeyValueElement(i);
2853	KeyExprs.push_back(Element.Key);
2854	ValueExprs.push_back(Element.Value);
2855	}
2856
2857	// (const id [])objects
2858	Expr *NSValueCallExpr =
2859	CallExpr::Create(*Context, NSDictDRE, ValueExprs, NSDictFType, VK_LValue,
2860	SourceLocation());
2861
2862	FieldDecl ARRFD = FieldDecl::Create(Context, nullptr, SourceLocation(),
2863	SourceLocation(),
2864	&Context->Idents.get("arr"),
2865	Context->getPointerType(Context->VoidPtrTy),
2866	nullptr, /BitWidth=/nullptr,
2867	/Mutable=/true, ICIS_NoInit);
2868	MemberExpr *DictLiteralValueME = new (Context)
2869	MemberExpr(NSValueCallExpr, false, SourceLocation(), ARRFD,
2870	SourceLocation(), ARRFD->getType(), VK_LValue, OK_Ordinary);
2871	QualType ConstIdT = Context->getObjCIdType().withConst();
2872	CStyleCastExpr * DictValueObjects =
2873	NoTypeInfoCStyleCastExpr(Context,
2874	Context->getPointerType(ConstIdT),
2875	CK_BitCast,
2876	DictLiteralValueME);
2877	// (const id <NSCopying> [])keys
2878	Expr *NSKeyCallExpr = CallExpr::Create(
2879	*Context, NSDictDRE, KeyExprs, NSDictFType, VK_LValue, SourceLocation());
2880
2881	MemberExpr *DictLiteralKeyME = new (Context)
2882	MemberExpr(NSKeyCallExpr, false, SourceLocation(), ARRFD,
2883	SourceLocation(), ARRFD->getType(), VK_LValue, OK_Ordinary);
2884
2885	CStyleCastExpr * DictKeyObjects =
2886	NoTypeInfoCStyleCastExpr(Context,
2887	Context->getPointerType(ConstIdT),
2888	CK_BitCast,
2889	DictLiteralKeyME);
2890
2891	// Synthesize a call to objc_msgSend().
2892	SmallVector<Expr*, 32> MsgExprs;
2893	SmallVector<Expr*, 4> ClsExprs;
2894	QualType expType = Exp->getType();
2895
2896	// Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2897	ObjCInterfaceDecl *Class =
2898	expType->getPointeeType()->getAs<ObjCObjectType>()->getInterface();
2899
2900	IdentifierInfo *clsName = Class->getIdentifier();
2901	ClsExprs.push_back(getStringLiteral(clsName->getName()));
2902	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2903	StartLoc, EndLoc);
2904	MsgExprs.push_back(Cls);
2905
2906	// Create a call to sel_registerName("arrayWithObjects:count:").
2907	// it will be the 2nd argument.
2908	SmallVector<Expr*, 4> SelExprs;
2909	ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
2910	SelExprs.push_back(getStringLiteral(DictMethod->getSelector().getAsString()));
2911	CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2912	SelExprs, StartLoc, EndLoc);
2913	MsgExprs.push_back(SelExp);
2914
2915	// (const id [])objects
2916	MsgExprs.push_back(DictValueObjects);
2917
2918	// (const id <NSCopying> [])keys
2919	MsgExprs.push_back(DictKeyObjects);
2920
2921	// (NSUInteger)cnt
2922	Expr cnt = IntegerLiteral::Create(Context,
2923	llvm::APInt(UnsignedIntSize, NumElements),
2924	Context->UnsignedIntTy, SourceLocation());
2925	MsgExprs.push_back(cnt);
2926
2927	SmallVector<QualType, 8> ArgTypes;
2928	ArgTypes.push_back(Context->getObjCClassType());
2929	ArgTypes.push_back(Context->getObjCSelType());
2930	for (const auto *PI : DictMethod->parameters()) {
2931	QualType T = PI->getType();
2932	if (const PointerType* PT = T->getAs<PointerType>()) {
2933	QualType PointeeTy = PT->getPointeeType();
2934	convertToUnqualifiedObjCType(PointeeTy);
2935	T = Context->getPointerType(PointeeTy);
2936	}
2937	ArgTypes.push_back(T);
2938	}
2939
2940	QualType returnType = Exp->getType();
2941	// Get the type, we will need to reference it in a couple spots.
2942	QualType msgSendType = MsgSendFlavor->getType();
2943
2944	// Create a reference to the objc_msgSend() declaration.
2945	DeclRefExpr *DRE = new (Context) DeclRefExpr(
2946	*Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2947
2948	CastExpr *cast = NoTypeInfoCStyleCastExpr(
2949	Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2950
2951	// Now do the "normal" pointer to function cast.
2952	QualType castType =
2953	getSimpleFunctionType(returnType, ArgTypes, DictMethod->isVariadic());
2954	castType = Context->getPointerType(castType);
2955	cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2956	cast);
2957
2958	// Don't forget the parens to enforce the proper binding.
2959	ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2960
2961	const FunctionType *FT = msgSendType->getAs<FunctionType>();
2962	CallExpr CE = CallExpr::Create(Context, PE, MsgExprs, FT->getReturnType(),
2963	VK_RValue, EndLoc);
2964	ReplaceStmt(Exp, CE);
2965	return CE;
2966	}
2967
2968	// struct __rw_objc_super {
2969	// struct objc_object object; struct objc_object superClass;
2970	// };
2971	QualType RewriteModernObjC::getSuperStructType() {
2972	if (!SuperStructDecl) {
2973	SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
2974	SourceLocation(), SourceLocation(),
2975	&Context->Idents.get("__rw_objc_super"));
2976	QualType FieldTypes[2];
2977
2978	// struct objc_object *object;
2979	FieldTypes[0] = Context->getObjCIdType();
2980	// struct objc_object *superClass;
2981	FieldTypes[1] = Context->getObjCIdType();
2982
2983	// Create fields
2984	for (unsigned i = 0; i < 2; ++i) {
2985	SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
2986	SourceLocation(),
2987	SourceLocation(), nullptr,
2988	FieldTypes[i], nullptr,
2989	/BitWidth=/nullptr,
2990	/Mutable=/false,
2991	ICIS_NoInit));
2992	}
2993
2994	SuperStructDecl->completeDefinition();
2995	}
2996	return Context->getTagDeclType(SuperStructDecl);
2997	}
2998
2999	QualType RewriteModernObjC::getConstantStringStructType() {
3000	if (!ConstantStringDecl) {
3001	ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
3002	SourceLocation(), SourceLocation(),
3003	&Context->Idents.get("__NSConstantStringImpl"));
3004	QualType FieldTypes[4];
3005
3006	// struct objc_object *receiver;
3007	FieldTypes[0] = Context->getObjCIdType();
3008	// int flags;
3009	FieldTypes[1] = Context->IntTy;
3010	// char *str;
3011	FieldTypes[2] = Context->getPointerType(Context->CharTy);
3012	// long length;
3013	FieldTypes[3] = Context->LongTy;
3014
3015	// Create fields
3016	for (unsigned i = 0; i < 4; ++i) {
3017	ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
3018	ConstantStringDecl,
3019	SourceLocation(),
3020	SourceLocation(), nullptr,
3021	FieldTypes[i], nullptr,
3022	/BitWidth=/nullptr,
3023	/Mutable=/true,
3024	ICIS_NoInit));
3025	}
3026
3027	ConstantStringDecl->completeDefinition();
3028	}
3029	return Context->getTagDeclType(ConstantStringDecl);
3030	}
3031
3032	/// getFunctionSourceLocation - returns start location of a function
3033	/// definition. Complication arises when function has declared as
3034	/// extern "C" or extern "C" {...}
3035	static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
3036	FunctionDecl *FD) {
3037	if (FD->isExternC() && !FD->isMain()) {
3038	const DeclContext *DC = FD->getDeclContext();
3039	if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3040	// if it is extern "C" {...}, return function decl's own location.
3041	if (!LSD->getRBraceLoc().isValid())
3042	return LSD->getExternLoc();
3043	}
3044	if (FD->getStorageClass() != SC_None)
3045	R.RewriteBlockLiteralFunctionDecl(FD);
3046	return FD->getTypeSpecStartLoc();
3047	}
3048
3049	void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
3050
3051	SourceLocation Location = D->getLocation();
3052
3053	if (Location.isFileID() && GenerateLineInfo) {
3054	std::string LineString("\n#line ");
3055	PresumedLoc PLoc = SM->getPresumedLoc(Location);
3056	LineString += utostr(PLoc.getLine());
3057	LineString += " \"";
3058	LineString += Lexer::Stringify(PLoc.getFilename());
3059	if (isa<ObjCMethodDecl>(D))
3060	LineString += "\"";
3061	else LineString += "\"\n";
3062
3063	Location = D->getBeginLoc();
3064	if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
3065	if (FD->isExternC() && !FD->isMain()) {
3066	const DeclContext *DC = FD->getDeclContext();
3067	if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3068	// if it is extern "C" {...}, return function decl's own location.
3069	if (!LSD->getRBraceLoc().isValid())
3070	Location = LSD->getExternLoc();
3071	}
3072	}
3073	InsertText(Location, LineString);
3074	}
3075	}
3076
3077	/// SynthMsgSendStretCallExpr - This routine translates message expression
3078	/// into a call to objc_msgSend_stret() entry point. Tricky part is that
3079	/// nil check on receiver must be performed before calling objc_msgSend_stret.
3080	/// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
3081	/// msgSendType - function type of objc_msgSend_stret(...)
3082	/// returnType - Result type of the method being synthesized.
3083	/// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
3084	/// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
3085	/// starting with receiver.
3086	/// Method - Method being rewritten.
3087	Expr RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl MsgSendStretFlavor,
3088	QualType returnType,
3089	SmallVectorImpl<QualType> &ArgTypes,
3090	SmallVectorImpl<Expr*> &MsgExprs,
3091	ObjCMethodDecl *Method) {
3092	// Now do the "normal" pointer to function cast.
3093	QualType FuncType = getSimpleFunctionType(
3094	returnType, ArgTypes, Method ? Method->isVariadic() : false);
3095	QualType castType = Context->getPointerType(FuncType);
3096
3097	// build type for containing the objc_msgSend_stret object.
3098	static unsigned stretCount=0;
3099	std::string name = "__Stret"; name += utostr(stretCount);
3100	std::string str =
3101	"extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
3102	str += "namespace {\n";
3103	str += "struct "; str += name;
3104	str += " {\n\t";
3105	str += name;
3106	str += "(id receiver, SEL sel";
3107	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3108	std::string ArgName = "arg"; ArgName += utostr(i);
3109	ArgTypes[i].getAsStringInternal(ArgName, Context->getPrintingPolicy());
3110	str += ", "; str += ArgName;
3111	}
3112	// could be vararg.
3113	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3114	std::string ArgName = "arg"; ArgName += utostr(i);
3115	MsgExprs[i]->getType().getAsStringInternal(ArgName,
3116	Context->getPrintingPolicy());
3117	str += ", "; str += ArgName;
3118	}
3119
3120	str += ") {\n";
3121	str += "\t unsigned size = sizeof(";
3122	str += returnType.getAsString(Context->getPrintingPolicy()); str += ");\n";
3123
3124	str += "\t if (size == 1 \|\| size == 2 \|\| size == 4 \|\| size == 8)\n";
3125
3126	str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3127	str += ")(void *)objc_msgSend)(receiver, sel";
3128	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3129	str += ", arg"; str += utostr(i);
3130	}
3131	// could be vararg.
3132	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3133	str += ", arg"; str += utostr(i);
3134	}
3135	str+= ");\n";
3136
3137	str += "\t else if (receiver == 0)\n";
3138	str += "\t memset((void*)&s, 0, sizeof(s));\n";
3139	str += "\t else\n";
3140
3141	str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3142	str += ")(void *)objc_msgSend_stret)(receiver, sel";
3143	for (unsigned i = 2; i < ArgTypes.size(); i++) {
3144	str += ", arg"; str += utostr(i);
3145	}
3146	// could be vararg.
3147	for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3148	str += ", arg"; str += utostr(i);
3149	}
3150	str += ");\n";
3151
3152	str += "\t}\n";
3153	str += "\t"; str += returnType.getAsString(Context->getPrintingPolicy());
3154	str += " s;\n";
3155	str += "};\n};\n\n";
3156	SourceLocation FunLocStart;
3157	if (CurFunctionDef)
3158	FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
3159	else {
3160	assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null");
3161	FunLocStart = CurMethodDef->getBeginLoc();
3162	}
3163
3164	InsertText(FunLocStart, str);
3165	++stretCount;
3166
3167	// AST for __Stretn(receiver, args).s;
3168	IdentifierInfo *ID = &Context->Idents.get(name);
3169	FunctionDecl *FD =
3170	FunctionDecl::Create(*Context, TUDecl, SourceLocation(), SourceLocation(),
3171	ID, FuncType, nullptr, SC_Extern, false, false);
3172	DeclRefExpr *DRE = new (Context)
3173	DeclRefExpr(*Context, FD, false, castType, VK_RValue, SourceLocation());
3174	CallExpr STCE = CallExpr::Create(Context, DRE, MsgExprs, castType,
3175	VK_LValue, SourceLocation());
3176
3177	FieldDecl FieldD = FieldDecl::Create(Context, nullptr, SourceLocation(),
3178	SourceLocation(),
3179	&Context->Idents.get("s"),
3180	returnType, nullptr,
3181	/BitWidth=/nullptr,
3182	/Mutable=/true, ICIS_NoInit);
3183	MemberExpr *ME = new (Context)
3184	MemberExpr(STCE, false, SourceLocation(), FieldD, SourceLocation(),
3185	FieldD->getType(), VK_LValue, OK_Ordinary);
3186
3187	return ME;
3188	}
3189
3190	Stmt RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr Exp,
3191	SourceLocation StartLoc,
3192	SourceLocation EndLoc) {
3193	if (!SelGetUidFunctionDecl)
3194	SynthSelGetUidFunctionDecl();
3195	if (!MsgSendFunctionDecl)
3196	SynthMsgSendFunctionDecl();
3197	if (!MsgSendSuperFunctionDecl)
3198	SynthMsgSendSuperFunctionDecl();
3199	if (!MsgSendStretFunctionDecl)
3200	SynthMsgSendStretFunctionDecl();
3201	if (!MsgSendSuperStretFunctionDecl)
3202	SynthMsgSendSuperStretFunctionDecl();
3203	if (!MsgSendFpretFunctionDecl)
3204	SynthMsgSendFpretFunctionDecl();
3205	if (!GetClassFunctionDecl)
3206	SynthGetClassFunctionDecl();
3207	if (!GetSuperClassFunctionDecl)
3208	SynthGetSuperClassFunctionDecl();
3209	if (!GetMetaClassFunctionDecl)
3210	SynthGetMetaClassFunctionDecl();
3211
3212	// default to objc_msgSend().
3213	FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
3214	// May need to use objc_msgSend_stret() as well.
3215	FunctionDecl *MsgSendStretFlavor = nullptr;
3216	if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
3217	QualType resultType = mDecl->getReturnType();
3218	if (resultType->isRecordType())
3219	MsgSendStretFlavor = MsgSendStretFunctionDecl;
3220	else if (resultType->isRealFloatingType())
3221	MsgSendFlavor = MsgSendFpretFunctionDecl;
3222	}
3223
3224	// Synthesize a call to objc_msgSend().
3225	SmallVector<Expr*, 8> MsgExprs;
3226	switch (Exp->getReceiverKind()) {
3227	case ObjCMessageExpr::SuperClass: {
3228	MsgSendFlavor = MsgSendSuperFunctionDecl;
3229	if (MsgSendStretFlavor)
3230	MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3231	assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3232
3233	ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3234
3235	SmallVector<Expr*, 4> InitExprs;
3236
3237	// set the receiver to self, the first argument to all methods.
3238	InitExprs.push_back(
3239	NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3240	CK_BitCast,
3241	new (Context) DeclRefExpr(*Context,
3242	CurMethodDef->getSelfDecl(),
3243	false,
3244	Context->getObjCIdType(),
3245	VK_RValue,
3246	SourceLocation()))
3247	); // set the 'receiver'.
3248
3249	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3250	SmallVector<Expr*, 8> ClsExprs;
3251	ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3252	// (Class)objc_getClass("CurrentClass")
3253	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
3254	ClsExprs, StartLoc, EndLoc);
3255	ClsExprs.clear();
3256	ClsExprs.push_back(Cls);
3257	Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
3258	StartLoc, EndLoc);
3259
3260	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3261	// To turn off a warning, type-cast to 'id'
3262	InitExprs.push_back( // set 'super class', using class_getSuperclass().
3263	NoTypeInfoCStyleCastExpr(Context,
3264	Context->getObjCIdType(),
3265	CK_BitCast, Cls));
3266	// struct __rw_objc_super
3267	QualType superType = getSuperStructType();
3268	Expr *SuperRep;
3269
3270	if (LangOpts.MicrosoftExt) {
3271	SynthSuperConstructorFunctionDecl();
3272	// Simulate a constructor call...
3273	DeclRefExpr *DRE = new (Context)
3274	DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3275	VK_LValue, SourceLocation());
3276	SuperRep = CallExpr::Create(*Context, DRE, InitExprs, superType,
3277	VK_LValue, SourceLocation());
3278	// The code for super is a little tricky to prevent collision with
3279	// the structure definition in the header. The rewriter has it's own
3280	// internal definition (__rw_objc_super) that is uses. This is why
3281	// we need the cast below. For example:
3282	// (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3283	//
3284	SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3285	Context->getPointerType(SuperRep->getType()),
3286	VK_RValue, OK_Ordinary,
3287	SourceLocation(), false);
3288	SuperRep = NoTypeInfoCStyleCastExpr(Context,
3289	Context->getPointerType(superType),
3290	CK_BitCast, SuperRep);
3291	} else {
3292	// (struct __rw_objc_super) { <exprs from above> }
3293	InitListExpr *ILE =
3294	new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3295	SourceLocation());
3296	TypeSourceInfo *superTInfo
3297	= Context->getTrivialTypeSourceInfo(superType);
3298	SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3299	superType, VK_LValue,
3300	ILE, false);
3301	// struct __rw_objc_super *
3302	SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3303	Context->getPointerType(SuperRep->getType()),
3304	VK_RValue, OK_Ordinary,
3305	SourceLocation(), false);
3306	}
3307	MsgExprs.push_back(SuperRep);
3308	break;
3309	}
3310
3311	case ObjCMessageExpr::Class: {
3312	SmallVector<Expr*, 8> ClsExprs;
3313	ObjCInterfaceDecl *Class
3314	= Exp->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
3315	IdentifierInfo *clsName = Class->getIdentifier();
3316	ClsExprs.push_back(getStringLiteral(clsName->getName()));
3317	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3318	StartLoc, EndLoc);
3319	CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
3320	Context->getObjCIdType(),
3321	CK_BitCast, Cls);
3322	MsgExprs.push_back(ArgExpr);
3323	break;
3324	}
3325
3326	case ObjCMessageExpr::SuperInstance:{
3327	MsgSendFlavor = MsgSendSuperFunctionDecl;
3328	if (MsgSendStretFlavor)
3329	MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3330	assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3331	ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3332	SmallVector<Expr*, 4> InitExprs;
3333
3334	InitExprs.push_back(
3335	NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3336	CK_BitCast,
3337	new (Context) DeclRefExpr(*Context,
3338	CurMethodDef->getSelfDecl(),
3339	false,
3340	Context->getObjCIdType(),
3341	VK_RValue, SourceLocation()))
3342	); // set the 'receiver'.
3343
3344	// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3345	SmallVector<Expr*, 8> ClsExprs;
3346	ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3347	// (Class)objc_getClass("CurrentClass")
3348	CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3349	StartLoc, EndLoc);
3350	ClsExprs.clear();
3351	ClsExprs.push_back(Cls);
3352	Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, 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 = CallExpr::Create(*Context, DRE, InitExprs, superType,
3372	VK_LValue, SourceLocation());
3373	// The code for super is a little tricky to prevent collision with
3374	// the structure definition in the header. The rewriter has it's own
3375	// internal definition (__rw_objc_super) that is uses. This is why
3376	// we need the cast below. For example:
3377	// (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3378	//
3379	SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3380	Context->getPointerType(SuperRep->getType()),
3381	VK_RValue, OK_Ordinary,
3382	SourceLocation(), false);
3383	SuperRep = NoTypeInfoCStyleCastExpr(Context,
3384	Context->getPointerType(superType),
3385	CK_BitCast, SuperRep);
3386	} else {
3387	// (struct __rw_objc_super) { <exprs from above> }
3388	InitListExpr *ILE =
3389	new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3390	SourceLocation());
3391	TypeSourceInfo *superTInfo
3392	= Context->getTrivialTypeSourceInfo(superType);
3393	SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3394	superType, VK_RValue, ILE,
3395	false);
3396	}
3397	MsgExprs.push_back(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>(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(Context, Context->getObjCIdType(),
3413	CK, recExpr);
3414	MsgExprs.push_back(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(Exp->getSelector().getAsString()));
3422	CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
3423	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(i);
3429	// Make all implicit casts explicit...ICE comes in handy:-)
3430	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
3431	// Reuse the ICE type, it is exactly what the doctor ordered.
3432	QualType type = ICE->getType();
3433	if (needToScanForQualifiers(type))
3434	type = Context->getObjCIdType();
3435	// Make sure we convert "type (^)(...)" to "type (*)(...)".
3436	(void)convertBlockPointerToFunctionPointer(type);
3437	const Expr *SubExpr = ICE->IgnoreParenImpCasts();
3438	CastKind CK;
3439	if (SubExpr->getType()->isIntegralType(*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(Context, type, CK, userExpr);
3455	}
3456	// Make id<P...> cast into an 'id' cast.
3457	else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
3458	if (CE->getType()->isObjCQualifiedIdType()) {
3459	while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
3460	userExpr = CE->getSubExpr();
3461	CastKind CK;
3462	if (userExpr->getType()->isIntegralType(*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(Context, Context->getObjCIdType(),
3472	CK, userExpr);
3473	}
3474	}
3475	MsgExprs.push_back(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(Context->getPointerType(getSuperStructType()));
3489	else
3490	ArgTypes.push_back(Context->getObjCIdType());
3491	ArgTypes.push_back(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);
3500	ArgTypes.push_back(t);
3501	}
3502	returnType = Exp->getType();
3503	convertToUnqualifiedObjCType(returnType);
3504	(void)convertBlockPointerToFunctionPointer(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(Context,
3520	Context->getPointerType(Context->VoidTy),
3521	CK_BitCast, 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(returnType, ArgTypes, MD ? MD->isVariadic() : true);
3528	castType = Context->getPointerType(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->getAs<FunctionType>();
3536	CallExpr CE = CallExpr::Create(Context, PE, MsgExprs, FT->getReturnType(),
3537	VK_RValue, EndLoc);
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	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, Exp->getBeginLoc(), 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(Context->getObjCIdType());
3571	ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
3572	SourceLocation(), SourceLocation(),
3573	&Context->Idents.get("Protocol"),
3574	TInfo);
3575	}
3576	return Context->getTypeDeclType(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	Context, Context->getPointerType(DRE->getType()), CK_BitCast, DRE);
3594	ReplaceStmt(Exp, castExpr);
3595	ProtocolExprDecls.insert(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>(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	IDecl->getLocation(), TagLocation);
3616	}
3617	if (EnumDecl *ED = dyn_cast<EnumDecl>(Tag)) {
3618	if (!ED \|\| !ED->getDeclName().getAsIdentifierInfo())
3619	return false;
3620	IsNamedDefinition = true;
3621	TagLocation = ED->getLocation();
3622	return Context->getSourceManager().isBeforeInTranslationUnit(
3623	IDecl->getLocation(), 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 (isa<TypedefType>(Type)) {
3633	Result += "\t";
3634	return false;
3635	}
3636
3637	if (Type->isArrayType()) {
3638	QualType ElemTy = Context->getBaseElementType(Type);
3639	return RewriteObjCFieldDeclType(ElemTy, Result);
3640	}
3641	else if (Type->isRecordType()) {
3642	RecordDecl *RD = Type->getAs<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(FD, Result);
3660	Result += "\t} ";
3661	return true;
3662	}
3663	}
3664	else if (Type->isEnumeralType()) {
3665	EnumDecl *ED = Type->getAs<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	llvm::APSInt Val = EC->getInitVal();
3679	Result += Val.toString(10);
3680	Result += ",\n";
3681	}
3682	Result += "\t} ";
3683	return true;
3684	}
3685	}
3686
3687	Result += "\t";
3688	convertObjCTypeToCStyleType(Type);
3689	return false;
3690	}
3691
3692
3693	/// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
3694	/// It handles elaborated types, as well as enum types in the process.
3695	void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
3696	std::string &Result) {
3697	QualType Type = fieldDecl->getType();
3698	std::string Name = fieldDecl->getNameAsString();
3699
3700	bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
3701	if (!EleboratedType)
3702	Type.getAsStringInternal(Name, Context->getPrintingPolicy());
3703	Result += Name;
3704	if (fieldDecl->isBitField()) {
3705	Result += " : "; Result += utostr(fieldDecl->getBitWidthValue(*Context));
3706	}
3707	else if (EleboratedType && Type->isArrayType()) {
3708	const ArrayType *AT = Context->getAsArrayType(Type);
3709	do {
3710	if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
3711	Result += "[";
3712	llvm::APInt Dim = CAT->getSize();
3713	Result += utostr(Dim.getZExtValue());
3714	Result += "]";
3715	}
3716	AT = Context->getAsArrayType(AT->getElementType());
3717	} while (AT);
3718	}
3719
3720	Result += ";\n";
3721	}
3722
3723	/// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
3724	/// named aggregate types into the input buffer.
3725	void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
3726	std::string &Result) {
3727	QualType Type = fieldDecl->getType();
3728	if (isa<TypedefType>(Type))
3729	return;
3730	if (Type->isArrayType())
3731	Type = Context->getBaseElementType(Type);
3732	ObjCContainerDecl *IDecl =
3733	dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
3734
3735	TagDecl *TD = nullptr;
3736	if (Type->isRecordType()) {
3737	TD = Type->getAs<RecordType>()->getDecl();
3738	}
3739	else if (Type->isEnumeralType()) {
3740	TD = Type->getAs<EnumType>()->getDecl();
3741	}
3742
3743	if (TD) {
3744	if (GlobalDefinedTags.count(TD))
3745	return;
3746
3747	bool IsNamedDefinition = false;
3748	if (IsTagDefinedInsideClass(IDecl, TD, IsNamedDefinition)) {
3749	RewriteObjCFieldDeclType(Type, Result);
3750	Result += ";";
3751	}
3752	if (IsNamedDefinition)
3753	GlobalDefinedTags.insert(TD);
3754	}
3755	}
3756
3757	unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
3758	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3759	if (ObjCInterefaceHasBitfieldGroups.count(CDecl)) {
3760	return IvarGroupNumber[IV];
3761	}
3762	unsigned GroupNo = 0;
3763	SmallVector<const ObjCIvarDecl *, 8> IVars;
3764	for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3765	IVD; IVD = IVD->getNextIvar())
3766	IVars.push_back(IVD);
3767
3768	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3769	if (IVars[i]->isBitField()) {
3770	IvarGroupNumber[IVars[i++]] = ++GroupNo;
3771	while (i < e && IVars[i]->isBitField())
3772	IvarGroupNumber[IVars[i++]] = GroupNo;
3773	if (i < e)
3774	--i;
3775	}
3776
3777	ObjCInterefaceHasBitfieldGroups.insert(CDecl);
3778	return IvarGroupNumber[IV];
3779	}
3780
3781	QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
3782	ObjCIvarDecl *IV,
3783	SmallVectorImpl<ObjCIvarDecl *> &IVars) {
3784	std::string StructTagName;
3785	ObjCIvarBitfieldGroupType(IV, StructTagName);
3786	RecordDecl RD = RecordDecl::Create(Context, TTK_Struct,
3787	Context->getTranslationUnitDecl(),
3788	SourceLocation(), SourceLocation(),
3789	&Context->Idents.get(StructTagName));
3790	for (unsigned i=0, e = IVars.size(); i < e; i++) {
3791	ObjCIvarDecl *Ivar = IVars[i];
3792	RD->addDecl(FieldDecl::Create(*Context, RD, SourceLocation(), SourceLocation(),
3793	&Context->Idents.get(Ivar->getName()),
3794	Ivar->getType(),
3795	nullptr, /Expr BW */Ivar->getBitWidth(),
3796	false, ICIS_NoInit));
3797	}
3798	RD->completeDefinition();
3799	return Context->getTagDeclType(RD);
3800	}
3801
3802	QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
3803	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3804	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3805	std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(CDecl, GroupNo);
3806	if (GroupRecordType.count(tuple))
3807	return GroupRecordType[tuple];
3808
3809	SmallVector<ObjCIvarDecl *, 8> IVars;
3810	for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3811	IVD; IVD = IVD->getNextIvar()) {
3812	if (IVD->isBitField())
3813	IVars.push_back(const_cast<ObjCIvarDecl *>(IVD));
3814	else {
3815	if (!IVars.empty()) {
3816	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3817	// Generate the struct type for this group of bitfield ivars.
3818	GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3819	SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3820	IVars.clear();
3821	}
3822	}
3823	}
3824	if (!IVars.empty()) {
3825	// Do the last one.
3826	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3827	GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3828	SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3829	}
3830	QualType RetQT = GroupRecordType[tuple];
3831	assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL");
3832
3833	return RetQT;
3834	}
3835
3836	/// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
3837	/// Name would be: classname__GRBF_n where n is the group number for this ivar.
3838	void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
3839	std::string &Result) {
3840	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3841	Result += CDecl->getName();
3842	Result += "__GRBF_";
3843	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3844	Result += utostr(GroupNo);
3845	}
3846
3847	/// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
3848	/// Name of the struct would be: classname__T_n where n is the group number for
3849	/// this ivar.
3850	void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
3851	std::string &Result) {
3852	const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3853	Result += CDecl->getName();
3854	Result += "__T_";
3855	unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3856	Result += utostr(GroupNo);
3857	}
3858
3859	/// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
3860	/// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
3861	/// this ivar.
3862	void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
3863	std::string &Result) {
3864	Result += "OBJC_IVAR_$_";
3865	ObjCIvarBitfieldGroupDecl(IV, Result);
3866	}
3867
3868	#define SKIP_BITFIELDS(IX, ENDIX, VEC) { \
3869	while ((IX < ENDIX) && VEC[IX]->isBitField()) \
3870	++IX; \
3871	if (IX < ENDIX) \
3872	--IX; \
3873	}
3874
3875	/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
3876	/// an objective-c class with ivars.
3877	void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
3878	std::string &Result) {
3879	assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
3880	assert(CDecl->getName() != "" &&
3881	"Name missing in SynthesizeObjCInternalStruct");
3882	ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
3883	SmallVector<ObjCIvarDecl *, 8> IVars;
3884	for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3885	IVD; IVD = IVD->getNextIvar())
3886	IVars.push_back(IVD);
3887
3888	SourceLocation LocStart = CDecl->getBeginLoc();
3889	SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
3890
3891	const char *startBuf = SM->getCharacterData(LocStart);
3892	const char *endBuf = SM->getCharacterData(LocEnd);
3893
3894	// If no ivars and no root or if its root, directly or indirectly,
3895	// have no ivars (thus not synthesized) then no need to synthesize this class.
3896	if ((!CDecl->isThisDeclarationADefinition() \|\| IVars.size() == 0) &&
3897	(!RCDecl \|\| !ObjCSynthesizedStructs.count(RCDecl))) {
3898	endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3899	ReplaceText(LocStart, endBuf-startBuf, Result);
3900	return;
3901	}
3902
3903	// Insert named struct/union definitions inside class to
3904	// outer scope. This follows semantics of locally defined
3905	// struct/unions in objective-c classes.
3906	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3907	RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
3908
3909	// Insert named structs which are syntheized to group ivar bitfields
3910	// to outer scope as well.
3911	for (unsigned i = 0, e = IVars.size(); i < e; i++)
3912	if (IVars[i]->isBitField()) {
3913	ObjCIvarDecl *IV = IVars[i];
3914	QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
3915	RewriteObjCFieldDeclType(QT, Result);
3916	Result += ";";
3917	// skip over ivar bitfields in this group.
3918	SKIP_BITFIELDS(i , e, IVars);
3919	}
3920
3921	Result += "\nstruct ";
3922	Result += CDecl->getNameAsString();
3923	Result += "_IMPL {\n";
3924
3925	if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
3926	Result += "\tstruct "; Result += RCDecl->getNameAsString();
3927	Result += "_IMPL "; Result += RCDecl->getNameAsString();
3928	Result += "_IVARS;\n";
3929	}
3930
3931	for (unsigned i = 0, e = IVars.size(); i < e; i++) {
3932	if (IVars[i]->isBitField()) {
3933	ObjCIvarDecl *IV = IVars[i];
3934	Result += "\tstruct ";
3935	ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
3936	ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
3937	// skip over ivar bitfields in this group.
3938	SKIP_BITFIELDS(i , e, IVars);
3939	}
3940	else
3941	RewriteObjCFieldDecl(IVars[i], Result);
3942	}
3943
3944	Result += "};\n";
3945	endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3946	ReplaceText(LocStart, endBuf-startBuf, Result);
3947	// Mark this struct as having been generated.
3948	if (!ObjCSynthesizedStructs.insert(CDecl).second)
3949	llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct");
3950	}
3951
3952	/// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
3953	/// have been referenced in an ivar access expression.
3954	void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
3955	std::string &Result) {
3956	// write out ivar offset symbols which have been referenced in an ivar
3957	// access expression.
3958	llvm::SmallSetVector<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
3959
3960	if (Ivars.empty())
3961	return;
3962
3963	llvm::DenseSet<std::pair<const ObjCInterfaceDecl*, unsigned> > GroupSymbolOutput;
3964	for (ObjCIvarDecl *IvarDecl : Ivars) {
3965	const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
3966	unsigned GroupNo = 0;
3967	if (IvarDecl->isBitField()) {
3968	GroupNo = ObjCIvarBitfieldGroupNo(IvarDecl);
3969	if (GroupSymbolOutput.count(std::make_pair(IDecl, GroupNo)))
3970	continue;
3971	}
3972	Result += "\n";
3973	if (LangOpts.MicrosoftExt)
3974	Result += "__declspec(allocate(\".objc_ivar$B\")) ";
3975	Result += "extern \"C\" ";
3976	if (LangOpts.MicrosoftExt &&
3977	IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
3978	IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
3979	Result += "__declspec(dllimport) ";
3980
3981	Result += "unsigned long ";
3982	if (IvarDecl->isBitField()) {
3983	ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
3984	GroupSymbolOutput.insert(std::make_pair(IDecl, GroupNo));
3985	}
3986	else
3987	WriteInternalIvarName(CDecl, IvarDecl, Result);
3988	Result += ";";
3989	}
3990	}
3991
3992	//===----------------------------------------------------------------------===//
3993	// Meta Data Emission
3994	//===----------------------------------------------------------------------===//
3995
3996	/// RewriteImplementations - This routine rewrites all method implementations
3997	/// and emits meta-data.
3998
3999	void RewriteModernObjC::RewriteImplementations() {
4000	int ClsDefCount = ClassImplementation.size();
4001	int CatDefCount = CategoryImplementation.size();
4002
4003	// Rewrite implemented methods
4004	for (int i = 0; i < ClsDefCount; i++) {
4005	ObjCImplementationDecl *OIMP = ClassImplementation[i];
4006	ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
4007	if (CDecl->isImplicitInterfaceDecl())
4008	assert(false &&
4009	"Legacy implicit interface rewriting not supported in moder abi");
4010	RewriteImplementationDecl(OIMP);
4011	}
4012
4013	for (int i = 0; i < CatDefCount; i++) {
4014	ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
4015	ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
4016	if (CDecl->isImplicitInterfaceDecl())
4017	assert(false &&
4018	"Legacy implicit interface rewriting not supported in moder abi");
4019	RewriteImplementationDecl(CIMP);
4020	}
4021	}
4022
4023	void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
4024	const std::string &Name,
4025	ValueDecl *VD, bool def) {
4026	assert(BlockByRefDeclNo.count(VD) &&
4027	"RewriteByRefString: ByRef decl missing");
4028	if (def)
4029	ResultStr += "struct ";
4030	ResultStr += "__Block_byref_" + Name +
4031	"_" + utostr(BlockByRefDeclNo[VD]) ;
4032	}
4033
4034	static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
4035	if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4036	return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
4037	return false;
4038	}
4039
4040	std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
4041	StringRef funcName,
4042	std::string Tag) {
4043	const FunctionType *AFT = CE->getFunctionType();
4044	QualType RT = AFT->getReturnType();
4045	std::string StructRef = "struct " + Tag;
4046	SourceLocation BlockLoc = CE->getExprLoc();
4047	std::string S;
4048	ConvertSourceLocationToLineDirective(BlockLoc, S);
4049
4050	S += "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
4051	funcName.str() + "_block_func_" + utostr(i);
4052
4053	BlockDecl *BD = CE->getBlockDecl();
4054
4055	if (isa<FunctionNoProtoType>(AFT)) {
4056	// No user-supplied arguments. Still need to pass in a pointer to the
4057	// block (to reference imported block decl refs).
4058	S += "(" + StructRef + " *__cself)";
4059	} else if (BD->param_empty()) {
4060	S += "(" + StructRef + " *__cself)";
4061	} else {
4062	const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
4063	assert(FT && "SynthesizeBlockFunc: No function proto");
4064	S += '(';
4065	// first add the implicit argument.
4066	S += StructRef + " *__cself, ";
4067	std::string ParamStr;
4068	for (BlockDecl::param_iterator AI = BD->param_begin(),
4069	E = BD->param_end(); AI != E; ++AI) {
4070	if (AI != BD->param_begin()) S += ", ";
4071	ParamStr = (*AI)->getNameAsString();
4072	QualType QT = (*AI)->getType();
4073	(void)convertBlockPointerToFunctionPointer(QT);
4074	QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
4075	S += ParamStr;
4076	}
4077	if (FT->isVariadic()) {
4078	if (!BD->param_empty()) S += ", ";
4079	S += "...";
4080	}
4081	S += ')';
4082	}
4083	S += " {\n";
4084
4085	// Create local declarations to avoid rewriting all closure decl ref exprs.
4086	// First, emit a declaration for all "by ref" decls.
4087	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4088	E = BlockByRefDecls.end(); I != E; ++I) {
4089	S += " ";
4090	std::string Name = (*I)->getNameAsString();
4091	std::string TypeString;
4092	RewriteByRefString(TypeString, Name, (*I));
4093	TypeString += " *";
4094	Name = TypeString + Name;
4095	S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
4096	}
4097	// Next, emit a declaration for all "by copy" declarations.
4098	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4099	E = BlockByCopyDecls.end(); I != E; ++I) {
4100	S += " ";
4101	// Handle nested closure invocation. For example:
4102	//
4103	// void (^myImportedClosure)(void);
4104	// myImportedClosure = ^(void) { setGlobalInt(x + y); };
4105	//
4106	// void (^anotherClosure)(void);
4107	// anotherClosure = ^(void) {
4108	// myImportedClosure(); // import and invoke the closure
4109	// };
4110	//
4111	if (isTopLevelBlockPointerType((*I)->getType())) {
4112	RewriteBlockPointerTypeVariable(S, (*I));
4113	S += " = (";
4114	RewriteBlockPointerType(S, (*I)->getType());
4115	S += ")";
4116	S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
4117	}
4118	else {
4119	std::string Name = (*I)->getNameAsString();
4120	QualType QT = (*I)->getType();
4121	if (HasLocalVariableExternalStorage(*I))
4122	QT = Context->getPointerType(QT);
4123	QT.getAsStringInternal(Name, Context->getPrintingPolicy());
4124	S += Name + " = __cself->" +
4125	(*I)->getNameAsString() + "; // bound by copy\n";
4126	}
4127	}
4128	std::string RewrittenStr = RewrittenBlockExprs[CE];
4129	const char *cstr = RewrittenStr.c_str();
4130	while (*cstr++ != '{') ;
4131	S += cstr;
4132	S += "\n";
4133	return S;
4134	}
4135
4136	std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
4137	StringRef funcName,
4138	std::string Tag) {
4139	std::string StructRef = "struct " + Tag;
4140	std::string S = "static void __";
4141
4142	S += funcName;
4143	S += "_block_copy_" + utostr(i);
4144	S += "(" + StructRef;
4145	S += "*dst, " + StructRef;
4146	S += "*src) {";
4147	for (ValueDecl *VD : ImportedBlockDecls) {
4148	S += "_Block_object_assign((void*)&dst->";
4149	S += VD->getNameAsString();
4150	S += ", (void*)src->";
4151	S += VD->getNameAsString();
4152	if (BlockByRefDeclsPtrSet.count(VD))
4153	S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/BLOCK_FIELD_IS_BYREF/);";
4154	else if (VD->getType()->isBlockPointerType())
4155	S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/BLOCK_FIELD_IS_BLOCK/);";
4156	else
4157	S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/BLOCK_FIELD_IS_OBJECT/);";
4158	}
4159	S += "}\n";
4160
4161	S += "\nstatic void __";
4162	S += funcName;
4163	S += "_block_dispose_" + utostr(i);
4164	S += "(" + StructRef;
4165	S += "*src) {";
4166	for (ValueDecl *VD : ImportedBlockDecls) {
4167	S += "_Block_object_dispose((void*)src->";
4168	S += VD->getNameAsString();
4169	if (BlockByRefDeclsPtrSet.count(VD))
4170	S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/BLOCK_FIELD_IS_BYREF/);";
4171	else if (VD->getType()->isBlockPointerType())
4172	S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/BLOCK_FIELD_IS_BLOCK/);";
4173	else
4174	S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/BLOCK_FIELD_IS_OBJECT/);";
4175	}
4176	S += "}\n";
4177	return S;
4178	}
4179
4180	std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
4181	std::string Desc) {
4182	std::string S = "\nstruct " + Tag;
4183	std::string Constructor = " " + Tag;
4184
4185	S += " {\n struct __block_impl impl;\n";
4186	S += " struct " + Desc;
4187	S += "* Desc;\n";
4188
4189	Constructor += "(void *fp, "; // Invoke function pointer.
4190	Constructor += "struct " + Desc; // Descriptor pointer.
4191	Constructor += " *desc";
4192
4193	if (BlockDeclRefs.size()) {
4194	// Output all "by copy" declarations.
4195	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4196	E = BlockByCopyDecls.end(); I != E; ++I) {
4197	S += " ";
4198	std::string FieldName = (*I)->getNameAsString();
4199	std::string ArgName = "_" + FieldName;
4200	// Handle nested closure invocation. For example:
4201	//
4202	// void (^myImportedBlock)(void);
4203	// myImportedBlock = ^(void) { setGlobalInt(x + y); };
4204	//
4205	// void (^anotherBlock)(void);
4206	// anotherBlock = ^(void) {
4207	// myImportedBlock(); // import and invoke the closure
4208	// };
4209	//
4210	if (isTopLevelBlockPointerType((*I)->getType())) {
4211	S += "struct __block_impl *";
4212	Constructor += ", void *" + ArgName;
4213	} else {
4214	QualType QT = (*I)->getType();
4215	if (HasLocalVariableExternalStorage(*I))
4216	QT = Context->getPointerType(QT);
4217	QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
4218	QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
4219	Constructor += ", " + ArgName;
4220	}
4221	S += FieldName + ";\n";
4222	}
4223	// Output all "by ref" declarations.
4224	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4225	E = BlockByRefDecls.end(); I != E; ++I) {
4226	S += " ";
4227	std::string FieldName = (*I)->getNameAsString();
4228	std::string ArgName = "_" + FieldName;
4229	{
4230	std::string TypeString;
4231	RewriteByRefString(TypeString, FieldName, (*I));
4232	TypeString += " *";
4233	FieldName = TypeString + FieldName;
4234	ArgName = TypeString + ArgName;
4235	Constructor += ", " + ArgName;
4236	}
4237	S += FieldName + "; // by ref\n";
4238	}
4239	// Finish writing the constructor.
4240	Constructor += ", int flags=0)";
4241	// Initialize all "by copy" arguments.
4242	bool firsTime = true;
4243	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4244	E = BlockByCopyDecls.end(); I != E; ++I) {
4245	std::string Name = (*I)->getNameAsString();
4246	if (firsTime) {
4247	Constructor += " : ";
4248	firsTime = false;
4249	}
4250	else
4251	Constructor += ", ";
4252	if (isTopLevelBlockPointerType((*I)->getType()))
4253	Constructor += Name + "((struct __block_impl *)_" + Name + ")";
4254	else
4255	Constructor += Name + "(_" + Name + ")";
4256	}
4257	// Initialize all "by ref" arguments.
4258	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4259	E = BlockByRefDecls.end(); I != E; ++I) {
4260	std::string Name = (*I)->getNameAsString();
4261	if (firsTime) {
4262	Constructor += " : ";
4263	firsTime = false;
4264	}
4265	else
4266	Constructor += ", ";
4267	Constructor += Name + "(_" + Name + "->__forwarding)";
4268	}
4269
4270	Constructor += " {\n";
4271	if (GlobalVarDecl)
4272	Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4273	else
4274	Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4275	Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4276
4277	Constructor += " Desc = desc;\n";
4278	} else {
4279	// Finish writing the constructor.
4280	Constructor += ", int flags=0) {\n";
4281	if (GlobalVarDecl)
4282	Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4283	else
4284	Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4285	Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4286	Constructor += " Desc = desc;\n";
4287	}
4288	Constructor += " ";
4289	Constructor += "}\n";
4290	S += Constructor;
4291	S += "};\n";
4292	return S;
4293	}
4294
4295	std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
4296	std::string ImplTag, int i,
4297	StringRef FunName,
4298	unsigned hasCopy) {
4299	std::string S = "\nstatic struct " + DescTag;
4300
4301	S += " {\n size_t reserved;\n";
4302	S += " size_t Block_size;\n";
4303	if (hasCopy) {
4304	S += " void (*copy)(struct ";
4305	S += ImplTag; S += "*, struct ";
4306	S += ImplTag; S += "*);\n";
4307
4308	S += " void (*dispose)(struct ";
4309	S += ImplTag; S += "*);\n";
4310	}
4311	S += "} ";
4312
4313	S += DescTag + "_DATA = { 0, sizeof(struct ";
4314	S += ImplTag + ")";
4315	if (hasCopy) {
4316	S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
4317	S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
4318	}
4319	S += "};\n";
4320	return S;
4321	}
4322
4323	void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
4324	StringRef FunName) {
4325	bool RewriteSC = (GlobalVarDecl &&
4326	!Blocks.empty() &&
4327	GlobalVarDecl->getStorageClass() == SC_Static &&
4328	GlobalVarDecl->getType().getCVRQualifiers());
4329	if (RewriteSC) {
4330	std::string SC(" void __");
4331	SC += GlobalVarDecl->getNameAsString();
4332	SC += "() {}";
4333	InsertText(FunLocStart, SC);
4334	}
4335
4336	// Insert closures that were part of the function.
4337	for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
4338	CollectBlockDeclRefInfo(Blocks[i]);
4339	// Need to copy-in the inner copied-in variables not actually used in this
4340	// block.
4341	for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
4342	DeclRefExpr *Exp = InnerDeclRefs[count++];
4343	ValueDecl *VD = Exp->getDecl();
4344	BlockDeclRefs.push_back(Exp);
4345	if (!VD->hasAttr<BlocksAttr>()) {
4346	if (!BlockByCopyDeclsPtrSet.count(VD)) {
4347	BlockByCopyDeclsPtrSet.insert(VD);
4348	BlockByCopyDecls.push_back(VD);
4349	}
4350	continue;
4351	}
4352
4353	if (!BlockByRefDeclsPtrSet.count(VD)) {
4354	BlockByRefDeclsPtrSet.insert(VD);
4355	BlockByRefDecls.push_back(VD);
4356	}
4357
4358	// imported objects in the inner blocks not used in the outer
4359	// blocks must be copied/disposed in the outer block as well.
4360	if (VD->getType()->isObjCObjectPointerType() \|\|
4361	VD->getType()->isBlockPointerType())
4362	ImportedBlockDecls.insert(VD);
4363	}
4364
4365	std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
4366	std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
4367
4368	std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
4369
4370	InsertText(FunLocStart, CI);
4371
4372	std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
4373
4374	InsertText(FunLocStart, CF);
4375
4376	if (ImportedBlockDecls.size()) {
4377	std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
4378	InsertText(FunLocStart, HF);
4379	}
4380	std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
4381	ImportedBlockDecls.size() > 0);
4382	InsertText(FunLocStart, BD);
4383
4384	BlockDeclRefs.clear();
4385	BlockByRefDecls.clear();
4386	BlockByRefDeclsPtrSet.clear();
4387	BlockByCopyDecls.clear();
4388	BlockByCopyDeclsPtrSet.clear();
4389	ImportedBlockDecls.clear();
4390	}
4391	if (RewriteSC) {
4392	// Must insert any 'const/volatile/static here. Since it has been
4393	// removed as result of rewriting of block literals.
4394	std::string SC;
4395	if (GlobalVarDecl->getStorageClass() == SC_Static)
4396	SC = "static ";
4397	if (GlobalVarDecl->getType().isConstQualified())
4398	SC += "const ";
4399	if (GlobalVarDecl->getType().isVolatileQualified())
4400	SC += "volatile ";
4401	if (GlobalVarDecl->getType().isRestrictQualified())
4402	SC += "restrict ";
4403	InsertText(FunLocStart, SC);
4404	}
4405	if (GlobalConstructionExp) {
4406	// extra fancy dance for global literal expression.
4407
4408	// Always the latest block expression on the block stack.
4409	std::string Tag = "__";
4410	Tag += FunName;
4411	Tag += "_block_impl_";
4412	Tag += utostr(Blocks.size()-1);
4413	std::string globalBuf = "static ";
4414	globalBuf += Tag; globalBuf += " ";
4415	std::string SStr;
4416
4417	llvm::raw_string_ostream constructorExprBuf(SStr);
4418	GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
4419	PrintingPolicy(LangOpts));
4420	globalBuf += constructorExprBuf.str();
4421	globalBuf += ";\n";
4422	InsertText(FunLocStart, globalBuf);
4423	GlobalConstructionExp = nullptr;
4424	}
4425
4426	Blocks.clear();
4427	InnerDeclRefsCount.clear();
4428	InnerDeclRefs.clear();
4429	RewrittenBlockExprs.clear();
4430	}
4431
4432	void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
4433	SourceLocation FunLocStart =
4434	(!Blocks.empty()) ? getFunctionSourceLocation(*this, FD)
4435	: FD->getTypeSpecStartLoc();
4436	StringRef FuncName = FD->getName();
4437
4438	SynthesizeBlockLiterals(FunLocStart, FuncName);
4439	}
4440
4441	static void BuildUniqueMethodName(std::string &Name,
4442	ObjCMethodDecl *MD) {
4443	ObjCInterfaceDecl *IFace = MD->getClassInterface();
4444	Name = IFace->getName();
4445	Name += "__" + MD->getSelector().getAsString();
4446	// Convert colons to underscores.
4447	std::string::size_type loc = 0;
4448	while ((loc = Name.find(':', loc)) != std::string::npos)
4449	Name.replace(loc, 1, "_");
4450	}
4451
4452	void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
4453	// fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
4454	// SourceLocation FunLocStart = MD->getBeginLoc();
4455	SourceLocation FunLocStart = MD->getBeginLoc();
4456	std::string FuncName;
4457	BuildUniqueMethodName(FuncName, MD);
4458	SynthesizeBlockLiterals(FunLocStart, FuncName);
4459	}
4460
4461	void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
4462	for (Stmt *SubStmt : S->children())
4463	if (SubStmt) {
4464	if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt))
4465	GetBlockDeclRefExprs(CBE->getBody());
4466	else
4467	GetBlockDeclRefExprs(SubStmt);
4468	}
4469	// Handle specific things.
4470	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
4471	if (DRE->refersToEnclosingVariableOrCapture() \|\|
4472	HasLocalVariableExternalStorage(DRE->getDecl()))
4473	// FIXME: Handle enums.
4474	BlockDeclRefs.push_back(DRE);
4475	}
4476
4477	void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
4478	SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
4479	llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
4480	for (Stmt *SubStmt : S->children())
4481	if (SubStmt) {
4482	if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt)) {
4483	InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
4484	GetInnerBlockDeclRefExprs(CBE->getBody(),
4485	InnerBlockDeclRefs,
4486	InnerContexts);
4487	}
4488	else
4489	GetInnerBlockDeclRefExprs(SubStmt, InnerBlockDeclRefs, InnerContexts);
4490	}
4491	// Handle specific things.
4492	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
4493	if (DRE->refersToEnclosingVariableOrCapture() \|\|
4494	HasLocalVariableExternalStorage(DRE->getDecl())) {
4495	if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
4496	InnerBlockDeclRefs.push_back(DRE);
4497	if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
4498	if (Var->isFunctionOrMethodVarDecl())
4499	ImportedLocalExternalDecls.insert(Var);
4500	}
4501	}
4502	}
4503
4504	/// convertObjCTypeToCStyleType - This routine converts such objc types
4505	/// as qualified objects, and blocks to their closest c/c++ types that
4506	/// it can. It returns true if input type was modified.
4507	bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
4508	QualType oldT = T;
4509	convertBlockPointerToFunctionPointer(T);
4510	if (T->isFunctionPointerType()) {
4511	QualType PointeeTy;
4512	if (const PointerType* PT = T->getAs<PointerType>()) {
4513	PointeeTy = PT->getPointeeType();
4514	if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
4515	T = convertFunctionTypeOfBlocks(FT);
4516	T = Context->getPointerType(T);
4517	}
4518	}
4519	}
4520
4521	convertToUnqualifiedObjCType(T);
4522	return T != oldT;
4523	}
4524
4525	/// convertFunctionTypeOfBlocks - This routine converts a function type
4526	/// whose result type may be a block pointer or whose argument type(s)
4527	/// might be block pointers to an equivalent function type replacing
4528	/// all block pointers to function pointers.
4529	QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
4530	const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4531	// FTP will be null for closures that don't take arguments.
4532	// Generate a funky cast.
4533	SmallVector<QualType, 8> ArgTypes;
4534	QualType Res = FT->getReturnType();
4535	bool modified = convertObjCTypeToCStyleType(Res);
4536
4537	if (FTP) {
4538	for (auto &I : FTP->param_types()) {
4539	QualType t = I;
4540	// Make sure we convert "t (^)(...)" to "t (*)(...)".
4541	if (convertObjCTypeToCStyleType(t))
4542	modified = true;
4543	ArgTypes.push_back(t);
4544	}
4545	}
4546	QualType FuncType;
4547	if (modified)
4548	FuncType = getSimpleFunctionType(Res, ArgTypes);
4549	else FuncType = QualType(FT, 0);
4550	return FuncType;
4551	}
4552
4553	Stmt RewriteModernObjC::SynthesizeBlockCall(CallExpr Exp, const Expr *BlockExp) {
4554	// Navigate to relevant type information.
4555	const BlockPointerType *CPT = nullptr;
4556
4557	if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
4558	CPT = DRE->getType()->getAs<BlockPointerType>();
4559	} else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
4560	CPT = MExpr->getType()->getAs<BlockPointerType>();
4561	}
4562	else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
4563	return SynthesizeBlockCall(Exp, PRE->getSubExpr());
4564	}
4565	else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
4566	CPT = IEXPR->getType()->getAs<BlockPointerType>();
4567	else if (const ConditionalOperator *CEXPR =
4568	dyn_cast<ConditionalOperator>(BlockExp)) {
4569	Expr *LHSExp = CEXPR->getLHS();
4570	Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
4571	Expr *RHSExp = CEXPR->getRHS();
4572	Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
4573	Expr *CONDExp = CEXPR->getCond();
4574	ConditionalOperator *CondExpr =
4575	new (Context) ConditionalOperator(CONDExp,
4576	SourceLocation(), cast<Expr>(LHSStmt),
4577	SourceLocation(), cast<Expr>(RHSStmt),
4578	Exp->getType(), VK_RValue, OK_Ordinary);
4579	return CondExpr;
4580	} else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
4581	CPT = IRE->getType()->getAs<BlockPointerType>();
4582	} else if (const PseudoObjectExpr *POE
4583	= dyn_cast<PseudoObjectExpr>(BlockExp)) {
4584	CPT = POE->getType()->castAs<BlockPointerType>();
4585	} else {
4586	assert(false && "RewriteBlockClass: Bad type");
4587	}
4588	assert(CPT && "RewriteBlockClass: Bad type");
4589	const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
4590	assert(FT && "RewriteBlockClass: Bad type");
4591	const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4592	// FTP will be null for closures that don't take arguments.
4593
4594	RecordDecl RD = RecordDecl::Create(Context, TTK_Struct, TUDecl,
4595	SourceLocation(), SourceLocation(),
4596	&Context->Idents.get("__block_impl"));
4597	QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
4598
4599	// Generate a funky cast.
4600	SmallVector<QualType, 8> ArgTypes;
4601
4602	// Push the block argument type.
4603	ArgTypes.push_back(PtrBlock);
4604	if (FTP) {
4605	for (auto &I : FTP->param_types()) {
4606	QualType t = I;
4607	// Make sure we convert "t (^)(...)" to "t (*)(...)".
4608	if (!convertBlockPointerToFunctionPointer(t))
4609	convertToUnqualifiedObjCType(t);
4610	ArgTypes.push_back(t);
4611	}
4612	}
4613	// Now do the pointer to function cast.
4614	QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
4615
4616	PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
4617
4618	CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
4619	CK_BitCast,
4620	const_cast<Expr*>(BlockExp));
4621	// Don't forget the parens to enforce the proper binding.
4622	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4623	BlkCast);
4624	//PE->dump();
4625
4626	FieldDecl FD = FieldDecl::Create(Context, nullptr, SourceLocation(),
4627	SourceLocation(),
4628	&Context->Idents.get("FuncPtr"),
4629	Context->VoidPtrTy, nullptr,
4630	/BitWidth=/nullptr, /Mutable=/true,
4631	ICIS_NoInit);
4632	MemberExpr *ME =
4633	new (Context) MemberExpr(PE, true, SourceLocation(), FD, SourceLocation(),
4634	FD->getType(), VK_LValue, OK_Ordinary);
4635
4636	CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
4637	CK_BitCast, ME);
4638	PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
4639
4640	SmallVector<Expr*, 8> BlkExprs;
4641	// Add the implicit argument.
4642	BlkExprs.push_back(BlkCast);
4643	// Add the user arguments.
4644	for (CallExpr::arg_iterator I = Exp->arg_begin(),
4645	E = Exp->arg_end(); I != E; ++I) {
4646	BlkExprs.push_back(*I);
4647	}
4648	CallExpr CE = CallExpr::Create(Context, PE, BlkExprs, Exp->getType(),
4649	VK_RValue, SourceLocation());
4650	return CE;
4651	}
4652
4653	// We need to return the rewritten expression to handle cases where the
4654	// DeclRefExpr is embedded in another expression being rewritten.
4655	// For example:
4656	//
4657	// int main() {
4658	// __block Foo *f;
4659	// __block int i;
4660	//
4661	// void (^myblock)() = ^() {
4662	// [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
4663	// i = 77;
4664	// };
4665	//}
4666	Stmt RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr DeclRefExp) {
4667	// Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
4668	// for each DeclRefExp where BYREFVAR is name of the variable.
4669	ValueDecl *VD = DeclRefExp->getDecl();
4670	bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() \|\|
4671	HasLocalVariableExternalStorage(DeclRefExp->getDecl());
4672
4673	FieldDecl FD = FieldDecl::Create(Context, nullptr, SourceLocation(),
4674	SourceLocation(),
4675	&Context->Idents.get("__forwarding"),
4676	Context->VoidPtrTy, nullptr,
4677	/BitWidth=/nullptr, /Mutable=/true,
4678	ICIS_NoInit);
4679	MemberExpr *ME = new (Context)
4680	MemberExpr(DeclRefExp, isArrow, SourceLocation(), FD, SourceLocation(),
4681	FD->getType(), VK_LValue, OK_Ordinary);
4682
4683	StringRef Name = VD->getName();
4684	FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
4685	&Context->Idents.get(Name),
4686	Context->VoidPtrTy, nullptr,
4687	/BitWidth=/nullptr, /Mutable=/true,
4688	ICIS_NoInit);
4689	ME =
4690	new (Context) MemberExpr(ME, true, SourceLocation(), FD, SourceLocation(),
4691	DeclRefExp->getType(), VK_LValue, OK_Ordinary);
4692
4693	// Need parens to enforce precedence.
4694	ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
4695	DeclRefExp->getExprLoc(),
4696	ME);
4697	ReplaceStmt(DeclRefExp, PE);
4698	return PE;
4699	}
4700
4701	// Rewrites the imported local variable V with external storage
4702	// (static, extern, etc.) as *V
4703	//
4704	Stmt RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr DRE) {
4705	ValueDecl *VD = DRE->getDecl();
4706	if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4707	if (!ImportedLocalExternalDecls.count(Var))
4708	return DRE;
4709	Expr *Exp = new (Context) UnaryOperator(DRE, UO_Deref, DRE->getType(),
4710	VK_LValue, OK_Ordinary,
4711	DRE->getLocation(), false);
4712	// Need parens to enforce precedence.
4713	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4714	Exp);
4715	ReplaceStmt(DRE, PE);
4716	return PE;
4717	}
4718
4719	void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
4720	SourceLocation LocStart = CE->getLParenLoc();
4721	SourceLocation LocEnd = CE->getRParenLoc();
4722
4723	// Need to avoid trying to rewrite synthesized casts.
4724	if (LocStart.isInvalid())
4725	return;
4726	// Need to avoid trying to rewrite casts contained in macros.
4727	if (!Rewriter::isRewritable(LocStart) \|\| !Rewriter::isRewritable(LocEnd))
4728	return;
4729
4730	const char *startBuf = SM->getCharacterData(LocStart);
4731	const char *endBuf = SM->getCharacterData(LocEnd);
4732	QualType QT = CE->getType();
4733	const Type* TypePtr = QT->getAs<Type>();
4734	if (isa<TypeOfExprType>(TypePtr)) {
4735	const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
4736	QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
4737	std::string TypeAsString = "(";
4738	RewriteBlockPointerType(TypeAsString, QT);
4739	TypeAsString += ")";
4740	ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
4741	return;
4742	}
4743	// advance the location to startArgList.
4744	const char *argPtr = startBuf;
4745
4746	while (*argPtr++ && (argPtr < endBuf)) {
4747	switch (*argPtr) {
4748	case '^':
4749	// Replace the '^' with '*'.
4750	LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
4751	ReplaceText(LocStart, 1, "*");
4752	break;
4753	}
4754	}
4755	}
4756
4757	void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
4758	CastKind CastKind = IC->getCastKind();
4759	if (CastKind != CK_BlockPointerToObjCPointerCast &&
4760	CastKind != CK_AnyPointerToBlockPointerCast)
4761	return;
4762
4763	QualType QT = IC->getType();
4764	(void)convertBlockPointerToFunctionPointer(QT);
4765	std::string TypeString(QT.getAsString(Context->getPrintingPolicy()));
4766	std::string Str = "(";
4767	Str += TypeString;
4768	Str += ")";
4769	InsertText(IC->getSubExpr()->getBeginLoc(), Str);
4770	}
4771
4772	void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
4773	SourceLocation DeclLoc = FD->getLocation();
4774	unsigned parenCount = 0;
4775
4776	// We have 1 or more arguments that have closure pointers.
4777	const char *startBuf = SM->getCharacterData(DeclLoc);
4778	const char *startArgList = strchr(startBuf, '(');
4779
4780	assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
4781
4782	parenCount++;
4783	// advance the location to startArgList.
4784	DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
4785	assert((DeclLoc.isValid()) && "Invalid DeclLoc");
4786
4787	const char *argPtr = startArgList;
4788
4789	while (*argPtr++ && parenCount) {
4790	switch (*argPtr) {
4791	case '^':
4792	// Replace the '^' with '*'.
4793	DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
4794	ReplaceText(DeclLoc, 1, "*");
4795	break;
4796	case '(':
4797	parenCount++;
4798	break;
4799	case ')':
4800	parenCount--;
4801	break;
4802	}
4803	}
4804	}
4805
4806	bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
4807	const FunctionProtoType *FTP;
4808	const PointerType *PT = QT->getAs<PointerType>();
4809	if (PT) {
4810	FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4811	} else {
4812	const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4813	assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4814	FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4815	}
4816	if (FTP) {
4817	for (const auto &I : FTP->param_types())
4818	if (isTopLevelBlockPointerType(I))
4819	return true;
4820	}
4821	return false;
4822	}
4823
4824	bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
4825	const FunctionProtoType *FTP;
4826	const PointerType *PT = QT->getAs<PointerType>();
4827	if (PT) {
4828	FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4829	} else {
4830	const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4831	assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4832	FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4833	}
4834	if (FTP) {
4835	for (const auto &I : FTP->param_types()) {
4836	if (I->isObjCQualifiedIdType())
4837	return true;
4838	if (I->isObjCObjectPointerType() &&
4839	I->getPointeeType()->isObjCQualifiedInterfaceType())
4840	return true;
4841	}
4842
4843	}
4844	return false;
4845	}
4846
4847	void RewriteModernObjC::GetExtentOfArgList(const char Name, const char &LParen,
4848	const char *&RParen) {
4849	const char *argPtr = strchr(Name, '(');
4850	assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
4851
4852	LParen = argPtr; // output the start.
4853	argPtr++; // skip past the left paren.
4854	unsigned parenCount = 1;
4855
4856	while (*argPtr && parenCount) {
4857	switch (*argPtr) {
4858	case '(': parenCount++; break;
4859	case ')': parenCount--; break;
4860	default: break;
4861	}
4862	if (parenCount) argPtr++;
4863	}
4864	assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
4865	RParen = argPtr; // output the end
4866	}
4867
4868	void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
4869	if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
4870	RewriteBlockPointerFunctionArgs(FD);
4871	return;
4872	}
4873	// Handle Variables and Typedefs.
4874	SourceLocation DeclLoc = ND->getLocation();
4875	QualType DeclT;
4876	if (VarDecl *VD = dyn_cast<VarDecl>(ND))
4877	DeclT = VD->getType();
4878	else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
4879	DeclT = TDD->getUnderlyingType();
4880	else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
4881	DeclT = FD->getType();
4882	else
4883	llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
4884
4885	const char *startBuf = SM->getCharacterData(DeclLoc);
4886	const char *endBuf = startBuf;
4887	// scan backward (from the decl location) for the end of the previous decl.
4888	while (startBuf != '^' && startBuf != ';' && startBuf != MainFileStart)
4889	startBuf--;
4890	SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
4891	std::string buf;
4892	unsigned OrigLength=0;
4893	// *startBuf != '^' if we are dealing with a pointer to function that
4894	// may take block argument types (which will be handled below).
4895	if (*startBuf == '^') {
4896	// Replace the '^' with '*', computing a negative offset.
4897	buf = '*';
4898	startBuf++;
4899	OrigLength++;
4900	}
4901	while (*startBuf != ')') {
4902	buf += *startBuf;
4903	startBuf++;
4904	OrigLength++;
4905	}
4906	buf += ')';
4907	OrigLength++;
4908
4909	if (PointerTypeTakesAnyBlockArguments(DeclT) \|\|
4910	PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
4911	// Replace the '^' with '*' for arguments.
4912	// Replace id<P> with id/<>/
4913	DeclLoc = ND->getLocation();
4914	startBuf = SM->getCharacterData(DeclLoc);
4915	const char argListBegin, argListEnd;
4916	GetExtentOfArgList(startBuf, argListBegin, argListEnd);
4917	while (argListBegin < argListEnd) {
4918	if (*argListBegin == '^')
4919	buf += '*';
4920	else if (*argListBegin == '<') {
4921	buf += "/*";
4922	buf += *argListBegin++;
4923	OrigLength++;
4924	while (*argListBegin != '>') {
4925	buf += *argListBegin++;
4926	OrigLength++;
4927	}
4928	buf += *argListBegin;
4929	buf += "*/";
4930	}
4931	else
4932	buf += *argListBegin;
4933	argListBegin++;
4934	OrigLength++;
4935	}
4936	buf += ')';
4937	OrigLength++;
4938	}
4939	ReplaceText(Start, OrigLength, buf);
4940	}
4941
4942	/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
4943	/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
4944	/// struct Block_byref_id_object *src) {
4945	/// _Block_object_assign (&_dest->object, _src->object,
4946	/// BLOCK_BYREF_CALLER \| BLOCK_FIELD_IS_OBJECT
4947	/// [\|BLOCK_FIELD_IS_WEAK]) // object
4948	/// _Block_object_assign(&_dest->object, _src->object,
4949	/// BLOCK_BYREF_CALLER \| BLOCK_FIELD_IS_BLOCK
4950	/// [\|BLOCK_FIELD_IS_WEAK]) // block
4951	/// }
4952	/// And:
4953	/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
4954	/// _Block_object_dispose(_src->object,
4955	/// BLOCK_BYREF_CALLER \| BLOCK_FIELD_IS_OBJECT
4956	/// [\|BLOCK_FIELD_IS_WEAK]) // object
4957	/// _Block_object_dispose(_src->object,
4958	/// BLOCK_BYREF_CALLER \| BLOCK_FIELD_IS_BLOCK
4959	/// [\|BLOCK_FIELD_IS_WEAK]) // block
4960	/// }
4961
4962	std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
4963	int flag) {
4964	std::string S;
4965	if (CopyDestroyCache.count(flag))
4966	return S;
4967	CopyDestroyCache.insert(flag);
4968	S = "static void __Block_byref_id_object_copy_";
4969	S += utostr(flag);
4970	S += "(void dst, void src) {\n";
4971
4972	// offset into the object pointer is computed as:
4973	// void * + void* + int + int + void* + void *
4974	unsigned IntSize =
4975	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
4976	unsigned VoidPtrSize =
4977	static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
4978
4979	unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
4980	S += " _Block_object_assign((char*)dst + ";
4981	S += utostr(offset);
4982	S += ", (void ) ((char)src + ";
4983	S += utostr(offset);
4984	S += "), ";
4985	S += utostr(flag);
4986	S += ");\n}\n";
4987
4988	S += "static void __Block_byref_id_object_dispose_";
4989	S += utostr(flag);
4990	S += "(void *src) {\n";
4991	S += " _Block_object_dispose((void ) ((char)src + ";
4992	S += utostr(offset);
4993	S += "), ";
4994	S += utostr(flag);
4995	S += ");\n}\n";
4996	return S;
4997	}
4998
4999	/// RewriteByRefVar - For each __block typex ND variable this routine transforms
5000	/// the declaration into:
5001	/// struct __Block_byref_ND {
5002	/// void *__isa; // NULL for everything except __weak pointers
5003	/// struct __Block_byref_ND *__forwarding;
5004	/// int32_t __flags;
5005	/// int32_t __size;
5006	/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
5007	/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
5008	/// typex ND;
5009	/// };
5010	///
5011	/// It then replaces declaration of ND variable with:
5012	/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
5013	/// __size=sizeof(struct __Block_byref_ND),
5014	/// ND=initializer-if-any};
5015	///
5016	///
5017	void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
5018	bool lastDecl) {
5019	int flag = 0;
5020	int isa = 0;
5021	SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
5022	if (DeclLoc.isInvalid())
5023	// If type location is missing, it is because of missing type (a warning).
5024	// Use variable's location which is good for this case.
5025	DeclLoc = ND->getLocation();
5026	const char *startBuf = SM->getCharacterData(DeclLoc);
5027	SourceLocation X = ND->getEndLoc();
5028	X = SM->getExpansionLoc(X);
5029	const char *endBuf = SM->getCharacterData(X);
5030	std::string Name(ND->getNameAsString());
5031	std::string ByrefType;
5032	RewriteByRefString(ByrefType, Name, ND, true);
5033	ByrefType += " {\n";
5034	ByrefType += " void *__isa;\n";
5035	RewriteByRefString(ByrefType, Name, ND);
5036	ByrefType += " *__forwarding;\n";
5037	ByrefType += " int __flags;\n";
5038	ByrefType += " int __size;\n";
5039	// Add void *__Block_byref_id_object_copy;
5040	// void *__Block_byref_id_object_dispose; if needed.
5041	QualType Ty = ND->getType();
5042	bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
5043	if (HasCopyAndDispose) {
5044	ByrefType += " void (__Block_byref_id_object_copy)(void, void*);\n";
5045	ByrefType += " void (__Block_byref_id_object_dispose)(void);\n";
5046	}
5047
5048	QualType T = Ty;
5049	(void)convertBlockPointerToFunctionPointer(T);
5050	T.getAsStringInternal(Name, Context->getPrintingPolicy());
5051
5052	ByrefType += " " + Name + ";\n";
5053	ByrefType += "};\n";
5054	// Insert this type in global scope. It is needed by helper function.
5055	SourceLocation FunLocStart;
5056	if (CurFunctionDef)
5057	FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
5058	else {
5059	assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
5060	FunLocStart = CurMethodDef->getBeginLoc();
5061	}
5062	InsertText(FunLocStart, ByrefType);
5063
5064	if (Ty.isObjCGCWeak()) {
5065	flag \|= BLOCK_FIELD_IS_WEAK;
5066	isa = 1;
5067	}
5068	if (HasCopyAndDispose) {
5069	flag = BLOCK_BYREF_CALLER;
5070	QualType Ty = ND->getType();
5071	// FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
5072	if (Ty->isBlockPointerType())
5073	flag \|= BLOCK_FIELD_IS_BLOCK;
5074	else
5075	flag \|= BLOCK_FIELD_IS_OBJECT;
5076	std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
5077	if (!HF.empty())
5078	Preamble += HF;
5079	}
5080
5081	// struct __Block_byref_ND ND =
5082	// {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
5083	// initializer-if-any};
5084	bool hasInit = (ND->getInit() != nullptr);
5085	// FIXME. rewriter does not support __block c++ objects which
5086	// require construction.
5087	if (hasInit)
5088	if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(ND->getInit())) {
5089	CXXConstructorDecl *CXXDecl = CExp->getConstructor();
5090	if (CXXDecl && CXXDecl->isDefaultConstructor())
5091	hasInit = false;
5092	}
5093
5094	unsigned flags = 0;
5095	if (HasCopyAndDispose)
5096	flags \|= BLOCK_HAS_COPY_DISPOSE;
5097	Name = ND->getNameAsString();
5098	ByrefType.clear();
5099	RewriteByRefString(ByrefType, Name, ND);
5100	std::string ForwardingCastType("(");
5101	ForwardingCastType += ByrefType + " *)";
5102	ByrefType += " " + Name + " = {(void*)";
5103	ByrefType += utostr(isa);
5104	ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
5105	ByrefType += utostr(flags);
5106	ByrefType += ", ";
5107	ByrefType += "sizeof(";
5108	RewriteByRefString(ByrefType, Name, ND);
5109	ByrefType += ")";
5110	if (HasCopyAndDispose) {
5111	ByrefType += ", __Block_byref_id_object_copy_";
5112	ByrefType += utostr(flag);
5113	ByrefType += ", __Block_byref_id_object_dispose_";
5114	ByrefType += utostr(flag);
5115	}
5116
5117	if (!firstDecl) {
5118	// In multiple __block declarations, and for all but 1st declaration,
5119	// find location of the separating comma. This would be start location
5120	// where new text is to be inserted.
5121	DeclLoc = ND->getLocation();
5122	const char *startDeclBuf = SM->getCharacterData(DeclLoc);
5123	const char *commaBuf = startDeclBuf;
5124	while (*commaBuf != ',')
5125	commaBuf--;
5126	assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','");
5127	DeclLoc = DeclLoc.getLocWithOffset(commaBuf - startDeclBuf);
5128	startBuf = commaBuf;
5129	}
5130
5131	if (!hasInit) {
5132	ByrefType += "};\n";
5133	unsigned nameSize = Name.size();
5134	// for block or function pointer declaration. Name is already
5135	// part of the declaration.
5136	if (Ty->isBlockPointerType() \|\| Ty->isFunctionPointerType())
5137	nameSize = 1;
5138	ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
5139	}
5140	else {
5141	ByrefType += ", ";
5142	SourceLocation startLoc;
5143	Expr *E = ND->getInit();
5144	if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
5145	startLoc = ECE->getLParenLoc();
5146	else
5147	startLoc = E->getBeginLoc();
5148	startLoc = SM->getExpansionLoc(startLoc);
5149	endBuf = SM->getCharacterData(startLoc);
5150	ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
5151
5152	const char separator = lastDecl ? ';' : ',';
5153	const char *startInitializerBuf = SM->getCharacterData(startLoc);
5154	const char *separatorBuf = strchr(startInitializerBuf, separator);
5155	assert((*separatorBuf == separator) &&
5156	"RewriteByRefVar: can't find ';' or ','");
5157	SourceLocation separatorLoc =
5158	startLoc.getLocWithOffset(separatorBuf-startInitializerBuf);
5159
5160	InsertText(separatorLoc, lastDecl ? "}" : "};\n");
5161	}
5162	}
5163
5164	void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
5165	// Add initializers for any closure decl refs.
5166	GetBlockDeclRefExprs(Exp->getBody());
5167	if (BlockDeclRefs.size()) {
5168	// Unique all "by copy" declarations.
5169	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5170	if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5171	if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5172	BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5173	BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
5174	}
5175	}
5176	// Unique all "by ref" declarations.
5177	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5178	if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5179	if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5180	BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5181	BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
5182	}
5183	}
5184	// Find any imported blocks...they will need special attention.
5185	for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5186	if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() \|\|
5187	BlockDeclRefs[i]->getType()->isObjCObjectPointerType() \|\|
5188	BlockDeclRefs[i]->getType()->isBlockPointerType())
5189	ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
5190	}
5191	}
5192
5193	FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
5194	IdentifierInfo *ID = &Context->Idents.get(name);
5195	QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
5196	return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
5197	SourceLocation(), ID, FType, nullptr, SC_Extern,
5198	false, false);
5199	}
5200
5201	Stmt RewriteModernObjC::SynthBlockInitExpr(BlockExpr Exp,
5202	const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
5203	const BlockDecl *block = Exp->getBlockDecl();
5204
5205	Blocks.push_back(Exp);
5206
5207	CollectBlockDeclRefInfo(Exp);
5208
5209	// Add inner imported variables now used in current block.
5210	int countOfInnerDecls = 0;
5211	if (!InnerBlockDeclRefs.empty()) {
5212	for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
5213	DeclRefExpr *Exp = InnerBlockDeclRefs[i];
5214	ValueDecl *VD = Exp->getDecl();
5215	if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
5216	// We need to save the copied-in variables in nested
5217	// blocks because it is needed at the end for some of the API generations.
5218	// See SynthesizeBlockLiterals routine.
5219	InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5220	BlockDeclRefs.push_back(Exp);
5221	BlockByCopyDeclsPtrSet.insert(VD);
5222	BlockByCopyDecls.push_back(VD);
5223	}
5224	if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
5225	InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5226	BlockDeclRefs.push_back(Exp);
5227	BlockByRefDeclsPtrSet.insert(VD);
5228	BlockByRefDecls.push_back(VD);
5229	}
5230	}
5231	// Find any imported blocks...they will need special attention.
5232	for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
5233	if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() \|\|
5234	InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() \|\|
5235	InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
5236	ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
5237	}
5238	InnerDeclRefsCount.push_back(countOfInnerDecls);
5239
5240	std::string FuncName;
5241
5242	if (CurFunctionDef)
5243	FuncName = CurFunctionDef->getNameAsString();
5244	else if (CurMethodDef)
5245	BuildUniqueMethodName(FuncName, CurMethodDef);
5246	else if (GlobalVarDecl)
5247	FuncName = std::string(GlobalVarDecl->getNameAsString());
5248
5249	bool GlobalBlockExpr =
5250	block->getDeclContext()->getRedeclContext()->isFileContext();
5251
5252	if (GlobalBlockExpr && !GlobalVarDecl) {
5253	Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
5254	GlobalBlockExpr = false;
5255	}
5256
5257	std::string BlockNumber = utostr(Blocks.size()-1);
5258
5259	std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
5260
5261	// Get a pointer to the function type so we can cast appropriately.
5262	QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
5263	QualType FType = Context->getPointerType(BFT);
5264
5265	FunctionDecl *FD;
5266	Expr *NewRep;
5267
5268	// Simulate a constructor call...
5269	std::string Tag;
5270
5271	if (GlobalBlockExpr)
5272	Tag = "__global_";
5273	else
5274	Tag = "__";
5275	Tag += FuncName + "_block_impl_" + BlockNumber;
5276
5277	FD = SynthBlockInitFunctionDecl(Tag);
5278	DeclRefExpr *DRE = new (Context)
5279	DeclRefExpr(*Context, FD, false, FType, VK_RValue, SourceLocation());
5280
5281	SmallVector<Expr*, 4> InitExprs;
5282
5283	// Initialize the block function.
5284	FD = SynthBlockInitFunctionDecl(Func);
5285	DeclRefExpr *Arg = new (Context) DeclRefExpr(
5286	*Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
5287	CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5288	CK_BitCast, Arg);
5289	InitExprs.push_back(castExpr);
5290
5291	// Initialize the block descriptor.
5292	std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
5293
5294	VarDecl *NewVD = VarDecl::Create(
5295	*Context, TUDecl, SourceLocation(), SourceLocation(),
5296	&Context->Idents.get(DescData), Context->VoidPtrTy, nullptr, SC_Static);
5297	UnaryOperator *DescRefExpr = new (Context) UnaryOperator(
5298	new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
5299	VK_LValue, SourceLocation()),
5300	UO_AddrOf, Context->getPointerType(Context->VoidPtrTy), VK_RValue,
5301	OK_Ordinary, SourceLocation(), false);
5302	InitExprs.push_back(DescRefExpr);
5303
5304	// Add initializers for any closure decl refs.
5305	if (BlockDeclRefs.size()) {
5306	Expr *Exp;
5307	// Output all "by copy" declarations.
5308	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
5309	E = BlockByCopyDecls.end(); I != E; ++I) {
5310	if (isObjCType((*I)->getType())) {
5311	// FIXME: Conform to ABI ([[obj retain] autorelease]).
5312	FD = SynthBlockInitFunctionDecl((*I)->getName());
5313	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5314	VK_LValue, SourceLocation());
5315	if (HasLocalVariableExternalStorage(*I)) {
5316	QualType QT = (*I)->getType();
5317	QT = Context->getPointerType(QT);
5318	Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
5319	OK_Ordinary, SourceLocation(),
5320	false);
5321	}
5322	} else if (isTopLevelBlockPointerType((*I)->getType())) {
5323	FD = SynthBlockInitFunctionDecl((*I)->getName());
5324	Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5325	VK_LValue, SourceLocation());
5326	Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5327	CK_BitCast, Arg);
5328	} else {
5329	FD = SynthBlockInitFunctionDecl((*I)->getName());
5330	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5331	VK_LValue, SourceLocation());
5332	if (HasLocalVariableExternalStorage(*I)) {
5333	QualType QT = (*I)->getType();
5334	QT = Context->getPointerType(QT);
5335	Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
5336	OK_Ordinary, SourceLocation(),
5337	false);
5338	}
5339
5340	}
5341	InitExprs.push_back(Exp);
5342	}
5343	// Output all "by ref" declarations.
5344	for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
5345	E = BlockByRefDecls.end(); I != E; ++I) {
5346	ValueDecl ND = (I);
5347	std::string Name(ND->getNameAsString());
5348	std::string RecName;
5349	RewriteByRefString(RecName, Name, ND, true);
5350	IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
5351	+ sizeof("struct"));
5352	RecordDecl RD = RecordDecl::Create(Context, TTK_Struct, TUDecl,
5353	SourceLocation(), SourceLocation(),
5354	II);
5355	assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
5356	QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
5357
5358	FD = SynthBlockInitFunctionDecl((*I)->getName());
5359	Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5360	VK_LValue, SourceLocation());
5361	bool isNestedCapturedVar = false;
5362	if (block)
5363	for (const auto &CI : block->captures()) {
5364	const VarDecl *variable = CI.getVariable();
5365	if (variable == ND && CI.isNested()) {
5366	assert (CI.isByRef() &&
5367	"SynthBlockInitExpr - captured block variable is not byref");
5368	isNestedCapturedVar = true;
5369	break;
5370	}
5371	}
5372	// captured nested byref variable has its address passed. Do not take
5373	// its address again.
5374	if (!isNestedCapturedVar)
5375	Exp = new (Context) UnaryOperator(Exp, UO_AddrOf,
5376	Context->getPointerType(Exp->getType()),
5377	VK_RValue, OK_Ordinary, SourceLocation(),
5378	false);
5379	Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
5380	InitExprs.push_back(Exp);
5381	}
5382	}
5383	if (ImportedBlockDecls.size()) {
5384	// generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) \| BLOCK_HAS_DESCRIPTOR
5385	int flag = (BLOCK_HAS_COPY_DISPOSE \| BLOCK_HAS_DESCRIPTOR);
5386	unsigned IntSize =
5387	static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5388	Expr FlagExp = IntegerLiteral::Create(Context, llvm::APInt(IntSize, flag),
5389	Context->IntTy, SourceLocation());
5390	InitExprs.push_back(FlagExp);
5391	}
5392	NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
5393	SourceLocation());
5394
5395	if (GlobalBlockExpr) {
5396	assert (!GlobalConstructionExp &&
5397	"SynthBlockInitExpr - GlobalConstructionExp must be null");
5398	GlobalConstructionExp = NewRep;
5399	NewRep = DRE;
5400	}
5401
5402	NewRep = new (Context) UnaryOperator(NewRep, UO_AddrOf,
5403	Context->getPointerType(NewRep->getType()),
5404	VK_RValue, OK_Ordinary, SourceLocation(), false);
5405	NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
5406	NewRep);
5407	// Put Paren around the call.
5408	NewRep = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
5409	NewRep);
5410
5411	BlockDeclRefs.clear();
5412	BlockByRefDecls.clear();
5413	BlockByRefDeclsPtrSet.clear();
5414	BlockByCopyDecls.clear();
5415	BlockByCopyDeclsPtrSet.clear();
5416	ImportedBlockDecls.clear();
5417	return NewRep;
5418	}
5419
5420	bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
5421	if (const ObjCForCollectionStmt * CS =
5422	dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
5423	return CS->getElement() == DS;
5424	return false;
5425	}
5426
5427	//===----------------------------------------------------------------------===//
5428	// Function Body / Expression rewriting
5429	//===----------------------------------------------------------------------===//
5430
5431	Stmt RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt S) {
5432	if (isa<SwitchStmt>(S) \|\| isa<WhileStmt>(S) \|\|
5433	isa<DoStmt>(S) \|\| isa<ForStmt>(S))
5434	Stmts.push_back(S);
5435	else if (isa<ObjCForCollectionStmt>(S)) {
5436	Stmts.push_back(S);
5437	ObjCBcLabelNo.push_back(++BcLabelCount);
5438	}
5439
5440	// Pseudo-object operations and ivar references need special
5441	// treatment because we're going to recursively rewrite them.
5442	if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
5443	if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
5444	return RewritePropertyOrImplicitSetter(PseudoOp);
5445	} else {
5446	return RewritePropertyOrImplicitGetter(PseudoOp);
5447	}
5448	} else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
5449	return RewriteObjCIvarRefExpr(IvarRefExpr);
5450	}
5451	else if (isa<OpaqueValueExpr>(S))
5452	S = cast<OpaqueValueExpr>(S)->getSourceExpr();
5453
5454	SourceRange OrigStmtRange = S->getSourceRange();
5455
5456	// Perform a bottom up rewrite of all children.
5457	for (Stmt *&childStmt : S->children())
5458	if (childStmt) {
5459	Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
5460	if (newStmt) {
5461	childStmt = newStmt;
5462	}
5463	}
5464
5465	if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
5466	SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
5467	llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
5468	InnerContexts.insert(BE->getBlockDecl());
5469	ImportedLocalExternalDecls.clear();
5470	GetInnerBlockDeclRefExprs(BE->getBody(),
5471	InnerBlockDeclRefs, InnerContexts);
5472	// Rewrite the block body in place.
5473	Stmt *SaveCurrentBody = CurrentBody;
5474	CurrentBody = BE->getBody();
5475	PropParentMap = nullptr;
5476	// block literal on rhs of a property-dot-sytax assignment
5477	// must be replaced by its synthesize ast so getRewrittenText
5478	// works as expected. In this case, what actually ends up on RHS
5479	// is the blockTranscribed which is the helper function for the
5480	// block literal; as in: self.c = ^() {[ace ARR];};
5481	bool saveDisableReplaceStmt = DisableReplaceStmt;
5482	DisableReplaceStmt = false;
5483	RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
5484	DisableReplaceStmt = saveDisableReplaceStmt;
5485	CurrentBody = SaveCurrentBody;
5486	PropParentMap = nullptr;
5487	ImportedLocalExternalDecls.clear();
5488	// Now we snarf the rewritten text and stash it away for later use.
5489	std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
5490	RewrittenBlockExprs[BE] = Str;
5491
5492	Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
5493
5494	//blockTranscribed->dump();
5495	ReplaceStmt(S, blockTranscribed);
5496	return blockTranscribed;
5497	}
5498	// Handle specific things.
5499	if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
5500	return RewriteAtEncode(AtEncode);
5501
5502	if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
5503	return RewriteAtSelector(AtSelector);
5504
5505	if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
5506	return RewriteObjCStringLiteral(AtString);
5507
5508	if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(S))
5509	return RewriteObjCBoolLiteralExpr(BoolLitExpr);
5510
5511	if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(S))
5512	return RewriteObjCBoxedExpr(BoxedExpr);
5513
5514	if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(S))
5515	return RewriteObjCArrayLiteralExpr(ArrayLitExpr);
5516
5517	if (ObjCDictionaryLiteral *DictionaryLitExpr =
5518	dyn_cast<ObjCDictionaryLiteral>(S))
5519	return RewriteObjCDictionaryLiteralExpr(DictionaryLitExpr);
5520
5521	if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
5522	#if 0
5523	// Before we rewrite it, put the original message expression in a comment.
5524	SourceLocation startLoc = MessExpr->getBeginLoc();
5525	SourceLocation endLoc = MessExpr->getEndLoc();
5526
5527	const char *startBuf = SM->getCharacterData(startLoc);
5528	const char *endBuf = SM->getCharacterData(endLoc);
5529
5530	std::string messString;
5531	messString += "// ";
5532	messString.append(startBuf, endBuf-startBuf+1);
5533	messString += "\n";
5534
5535	// FIXME: Missing definition of
5536	// InsertText(clang::SourceLocation, char const*, unsigned int).
5537	// InsertText(startLoc, messString);
5538	// Tried this, but it didn't work either...
5539	// ReplaceText(startLoc, 0, messString.c_str(), messString.size());
5540	#endif
5541	return RewriteMessageExpr(MessExpr);
5542	}
5543
5544	if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
5545	dyn_cast<ObjCAutoreleasePoolStmt>(S)) {
5546	return RewriteObjCAutoreleasePoolStmt(StmtAutoRelease);
5547	}
5548
5549	if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
5550	return RewriteObjCTryStmt(StmtTry);
5551
5552	if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
5553	return RewriteObjCSynchronizedStmt(StmtTry);
5554
5555	if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
5556	return RewriteObjCThrowStmt(StmtThrow);
5557
5558	if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
5559	return RewriteObjCProtocolExpr(ProtocolExp);
5560
5561	if (ObjCForCollectionStmt *StmtForCollection =
5562	dyn_cast<ObjCForCollectionStmt>(S))
5563	return RewriteObjCForCollectionStmt(StmtForCollection,
5564	OrigStmtRange.getEnd());
5565	if (BreakStmt *StmtBreakStmt =
5566	dyn_cast<BreakStmt>(S))
5567	return RewriteBreakStmt(StmtBreakStmt);
5568	if (ContinueStmt *StmtContinueStmt =
5569	dyn_cast<ContinueStmt>(S))
5570	return RewriteContinueStmt(StmtContinueStmt);
5571
5572	// Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
5573	// and cast exprs.
5574	if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
5575	// FIXME: What we're doing here is modifying the type-specifier that
5576	// precedes the first Decl. In the future the DeclGroup should have
5577	// a separate type-specifier that we can rewrite.
5578	// NOTE: We need to avoid rewriting the DeclStmt if it is within
5579	// the context of an ObjCForCollectionStmt. For example:
5580	// NSArray *someArray;
5581	// for (id <FooProtocol> index in someArray) ;
5582	// This is because RewriteObjCForCollectionStmt() does textual rewriting
5583	// and it depends on the original text locations/positions.
5584	if (Stmts.empty() \|\| !IsDeclStmtInForeachHeader(DS))
5585	RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
5586
5587	// Blocks rewrite rules.
5588	for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
5589	DI != DE; ++DI) {
5590	Decl SD = DI;
5591	if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
5592	if (isTopLevelBlockPointerType(ND->getType()))
5593	RewriteBlockPointerDecl(ND);
5594	else if (ND->getType()->isFunctionPointerType())
5595	CheckFunctionPointerDecl(ND->getType(), ND);
5596	if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
5597	if (VD->hasAttr<BlocksAttr>()) {
5598	static unsigned uniqueByrefDeclCount = 0;
5599	assert(!BlockByRefDeclNo.count(ND) &&
5600	"RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
5601	BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
5602	RewriteByRefVar(VD, (DI == DS->decl_begin()), ((DI+1) == DE));
5603	}
5604	else
5605	RewriteTypeOfDecl(VD);
5606	}
5607	}
5608	if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
5609	if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5610	RewriteBlockPointerDecl(TD);
5611	else if (TD->getUnderlyingType()->isFunctionPointerType())
5612	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5613	}
5614	}
5615	}
5616
5617	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
5618	RewriteObjCQualifiedInterfaceTypes(CE);
5619
5620	if (isa<SwitchStmt>(S) \|\| isa<WhileStmt>(S) \|\|
5621	isa<DoStmt>(S) \|\| isa<ForStmt>(S)) {
5622	assert(!Stmts.empty() && "Statement stack is empty");
5623	assert ((isa<SwitchStmt>(Stmts.back()) \|\| isa<WhileStmt>(Stmts.back()) \|\|
5624	isa<DoStmt>(Stmts.back()) \|\| isa<ForStmt>(Stmts.back()))
5625	&& "Statement stack mismatch");
5626	Stmts.pop_back();
5627	}
5628	// Handle blocks rewriting.
5629	if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
5630	ValueDecl *VD = DRE->getDecl();
5631	if (VD->hasAttr<BlocksAttr>())
5632	return RewriteBlockDeclRefExpr(DRE);
5633	if (HasLocalVariableExternalStorage(VD))
5634	return RewriteLocalVariableExternalStorage(DRE);
5635	}
5636
5637	if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
5638	if (CE->getCallee()->getType()->isBlockPointerType()) {
5639	Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
5640	ReplaceStmt(S, BlockCall);
5641	return BlockCall;
5642	}
5643	}
5644	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
5645	RewriteCastExpr(CE);
5646	}
5647	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5648	RewriteImplicitCastObjCExpr(ICE);
5649	}
5650	#if 0
5651
5652	if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5653	CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
5654	ICE->getSubExpr(),
5655	SourceLocation());
5656	// Get the new text.
5657	std::string SStr;
5658	llvm::raw_string_ostream Buf(SStr);
5659	Replacement->printPretty(Buf);
5660	const std::string &Str = Buf.str();
5661
5662	printf("CAST = %s\n", &Str[0]);
5663	InsertText(ICE->getSubExpr()->getBeginLoc(), Str);
5664	delete S;
5665	return Replacement;
5666	}
5667	#endif
5668	// Return this stmt unmodified.
5669	return S;
5670	}
5671
5672	void RewriteModernObjC::RewriteRecordBody(RecordDecl *RD) {
5673	for (auto *FD : RD->fields()) {
5674	if (isTopLevelBlockPointerType(FD->getType()))
5675	RewriteBlockPointerDecl(FD);
5676	if (FD->getType()->isObjCQualifiedIdType() \|\|
5677	FD->getType()->isObjCQualifiedInterfaceType())
5678	RewriteObjCQualifiedInterfaceTypes(FD);
5679	}
5680	}
5681
5682	/// HandleDeclInMainFile - This is called for each top-level decl defined in the
5683	/// main file of the input.
5684	void RewriteModernObjC::HandleDeclInMainFile(Decl *D) {
5685	switch (D->getKind()) {
5686	case Decl::Function: {
5687	FunctionDecl *FD = cast<FunctionDecl>(D);
5688	if (FD->isOverloadedOperator())
5689	return;
5690
5691	// Since function prototypes don't have ParmDecl's, we check the function
5692	// prototype. This enables us to rewrite function declarations and
5693	// definitions using the same code.
5694	RewriteBlocksInFunctionProtoType(FD->getType(), FD);
5695
5696	if (!FD->isThisDeclarationADefinition())
5697	break;
5698
5699	// FIXME: If this should support Obj-C++, support CXXTryStmt
5700	if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
5701	CurFunctionDef = FD;
5702	CurrentBody = Body;
5703	Body =
5704	cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5705	FD->setBody(Body);
5706	CurrentBody = nullptr;
5707	if (PropParentMap) {
5708	delete PropParentMap;
5709	PropParentMap = nullptr;
5710	}
5711	// This synthesizes and inserts the block "impl" struct, invoke function,
5712	// and any copy/dispose helper functions.
5713	InsertBlockLiteralsWithinFunction(FD);
5714	RewriteLineDirective(D);
5715	CurFunctionDef = nullptr;
5716	}
5717	break;
5718	}
5719	case Decl::ObjCMethod: {
5720	ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
5721	if (CompoundStmt *Body = MD->getCompoundBody()) {
5722	CurMethodDef = MD;
5723	CurrentBody = Body;
5724	Body =
5725	cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5726	MD->setBody(Body);
5727	CurrentBody = nullptr;
5728	if (PropParentMap) {
5729	delete PropParentMap;
5730	PropParentMap = nullptr;
5731	}
5732	InsertBlockLiteralsWithinMethod(MD);
5733	RewriteLineDirective(D);
5734	CurMethodDef = nullptr;
5735	}
5736	break;
5737	}
5738	case Decl::ObjCImplementation: {
5739	ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
5740	ClassImplementation.push_back(CI);
5741	break;
5742	}
5743	case Decl::ObjCCategoryImpl: {
5744	ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
5745	CategoryImplementation.push_back(CI);
5746	break;
5747	}
5748	case Decl::Var: {
5749	VarDecl *VD = cast<VarDecl>(D);
5750	RewriteObjCQualifiedInterfaceTypes(VD);
5751	if (isTopLevelBlockPointerType(VD->getType()))
5752	RewriteBlockPointerDecl(VD);
5753	else if (VD->getType()->isFunctionPointerType()) {
5754	CheckFunctionPointerDecl(VD->getType(), VD);
5755	if (VD->getInit()) {
5756	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5757	RewriteCastExpr(CE);
5758	}
5759	}
5760	} else if (VD->getType()->isRecordType()) {
5761	RecordDecl *RD = VD->getType()->getAs<RecordType>()->getDecl();
5762	if (RD->isCompleteDefinition())
5763	RewriteRecordBody(RD);
5764	}
5765	if (VD->getInit()) {
5766	GlobalVarDecl = VD;
5767	CurrentBody = VD->getInit();
5768	RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
5769	CurrentBody = nullptr;
5770	if (PropParentMap) {
5771	delete PropParentMap;
5772	PropParentMap = nullptr;
5773	}
5774	SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
5775	GlobalVarDecl = nullptr;
5776
5777	// This is needed for blocks.
5778	if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5779	RewriteCastExpr(CE);
5780	}
5781	}
5782	break;
5783	}
5784	case Decl::TypeAlias:
5785	case Decl::Typedef: {
5786	if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
5787	if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5788	RewriteBlockPointerDecl(TD);
5789	else if (TD->getUnderlyingType()->isFunctionPointerType())
5790	CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5791	else
5792	RewriteObjCQualifiedInterfaceTypes(TD);
5793	}
5794	break;
5795	}
5796	case Decl::CXXRecord:
5797	case Decl::Record: {
5798	RecordDecl *RD = cast<RecordDecl>(D);
5799	if (RD->isCompleteDefinition())
5800	RewriteRecordBody(RD);
5801	break;
5802	}
5803	default:
5804	break;
5805	}
5806	// Nothing yet.
5807	}
5808
5809	/// Write_ProtocolExprReferencedMetadata - This routine writer out the
5810	/// protocol reference symbols in the for of:
5811	/// struct _protocol_t *PROTOCOL_REF = &PROTOCOL_METADATA.
5812	static void Write_ProtocolExprReferencedMetadata(ASTContext *Context,
5813	ObjCProtocolDecl *PDecl,
5814	std::string &Result) {
5815	// Also output .objc_protorefs$B section and its meta-data.
5816	if (Context->getLangOpts().MicrosoftExt)
5817	Result += "static ";
5818	Result += "struct _protocol_t *";
5819	Result += "_OBJC_PROTOCOL_REFERENCE_$_";
5820	Result += PDecl->getNameAsString();
5821	Result += " = &";
5822	Result += "_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
5823	Result += ";\n";
5824	}
5825
5826	void RewriteModernObjC::HandleTranslationUnit(ASTContext &C) {
5827	if (Diags.hasErrorOccurred())
5828	return;
5829
5830	RewriteInclude();
5831
5832	for (unsigned i = 0, e = FunctionDefinitionsSeen.size(); i < e; i++) {
5833	// translation of function bodies were postponed until all class and
5834	// their extensions and implementations are seen. This is because, we
5835	// cannot build grouping structs for bitfields until they are all seen.
5836	FunctionDecl *FDecl = FunctionDefinitionsSeen[i];
5837	HandleTopLevelSingleDecl(FDecl);
5838	}
5839
5840	// Here's a great place to add any extra declarations that may be needed.
5841	// Write out meta data for each @protocol(<expr>).
5842	for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
5843	RewriteObjCProtocolMetaData(ProtDecl, Preamble);
5844	Write_ProtocolExprReferencedMetadata(Context, ProtDecl, Preamble);
5845	}
5846
5847	InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
5848
5849	if (ClassImplementation.size() \|\| CategoryImplementation.size())
5850	RewriteImplementations();
5851
5852	for (unsigned i = 0, e = ObjCInterfacesSeen.size(); i < e; i++) {
5853	ObjCInterfaceDecl *CDecl = ObjCInterfacesSeen[i];
5854	// Write struct declaration for the class matching its ivar declarations.
5855	// Note that for modern abi, this is postponed until the end of TU
5856	// because class extensions and the implementation might declare their own
5857	// private ivars.
5858	RewriteInterfaceDecl(CDecl);
5859	}
5860
5861	// Get the buffer corresponding to MainFileID. If we haven't changed it, then
5862	// we are done.
5863	if (const RewriteBuffer *RewriteBuf =
5864	Rewrite.getRewriteBufferFor(MainFileID)) {
5865	//printf("Changed:\n");
5866	*OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
5867	} else {
5868	llvm::errs() << "No changes\n";
5869	}
5870
5871	if (ClassImplementation.size() \|\| CategoryImplementation.size() \|\|
5872	ProtocolExprDecls.size()) {
5873	// Rewrite Objective-c meta data*
5874	std::string ResultStr;
5875	RewriteMetaDataIntoBuffer(ResultStr);
5876	// Emit metadata.
5877	*OutFile << ResultStr;
5878	}
5879	// Emit ImageInfo;
5880	{
5881	std::string ResultStr;
5882	WriteImageInfo(ResultStr);
5883	*OutFile << ResultStr;
5884	}
5885	OutFile->flush();
5886	}
5887
5888	void RewriteModernObjC::Initialize(ASTContext &context) {
5889	InitializeCommon(context);
5890
5891	Preamble += "#ifndef __OBJC2__\n";
5892	Preamble += "#define __OBJC2__\n";
5893	Preamble += "#endif\n";
5894
5895	// declaring objc_selector outside the parameter list removes a silly
5896	// scope related warning...
5897	if (IsHeader)
5898	Preamble = "#pragma once\n";
5899	Preamble += "struct objc_selector; struct objc_class;\n";
5900	Preamble += "struct __rw_objc_super { \n\tstruct objc_object *object; ";
5901	Preamble += "\n\tstruct objc_object *superClass; ";
5902	// Add a constructor for creating temporary objects.
5903	Preamble += "\n\t__rw_objc_super(struct objc_object o, struct objc_object s) ";
5904	Preamble += ": object(o), superClass(s) {} ";
5905	Preamble += "\n};\n";
5906
5907	if (LangOpts.MicrosoftExt) {
5908	// Define all sections using syntax that makes sense.
5909	// These are currently generated.
5910	Preamble += "\n#pragma section(\".objc_classlist$B\", long, read, write)\n";
5911	Preamble += "#pragma section(\".objc_catlist$B\", long, read, write)\n";
5912	Preamble += "#pragma section(\".objc_imageinfo$B\", long, read, write)\n";
5913	Preamble += "#pragma section(\".objc_nlclslist$B\", long, read, write)\n";
5914	Preamble += "#pragma section(\".objc_nlcatlist$B\", long, read, write)\n";
5915	// These are generated but not necessary for functionality.
5916	Preamble += "#pragma section(\".cat_cls_meth$B\", long, read, write)\n";
5917	Preamble += "#pragma section(\".inst_meth$B\", long, read, write)\n";
5918	Preamble += "#pragma section(\".cls_meth$B\", long, read, write)\n";
5919	Preamble += "#pragma section(\".objc_ivar$B\", long, read, write)\n";
5920
5921	// These need be generated for performance. Currently they are not,
5922	// using API calls instead.
5923	Preamble += "#pragma section(\".objc_selrefs$B\", long, read, write)\n";
5924	Preamble += "#pragma section(\".objc_classrefs$B\", long, read, write)\n";
5925	Preamble += "#pragma section(\".objc_superrefs$B\", long, read, write)\n";
5926
5927	}
5928	Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
5929	Preamble += "typedef struct objc_object Protocol;\n";
5930	Preamble += "#define _REWRITER_typedef_Protocol\n";
5931	Preamble += "#endif\n";
5932	if (LangOpts.MicrosoftExt) {
5933	Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
5934	Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
5935	}
5936	else
5937	Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
5938
5939	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend(void);\n";
5940	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper(void);\n";
5941	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_stret(void);\n";
5942	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper_stret(void);\n";
5943	Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_fpret(void);\n";
5944
5945	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getClass";
5946	Preamble += "(const char *);\n";
5947	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
5948	Preamble += "(struct objc_class *);\n";
5949	Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getMetaClass";
5950	Preamble += "(const char *);\n";
5951	Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw( struct objc_object *);\n";
5952	// @synchronized hooks.
5953	Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter( struct objc_object *);\n";
5954	Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit( struct objc_object *);\n";
5955	Preamble += "__OBJC_RW_DLLIMPORT Protocol objc_getProtocol(const char );\n";
5956	Preamble += "#ifdef _WIN64\n";
5957	Preamble += "typedef unsigned long long _WIN_NSUInteger;\n";
5958	Preamble += "#else\n";
5959	Preamble += "typedef unsigned int _WIN_NSUInteger;\n";
5960	Preamble += "#endif\n";
5961	Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
5962	Preamble += "struct __objcFastEnumerationState {\n\t";
5963	Preamble += "unsigned long state;\n\t";
5964	Preamble += "void **itemsPtr;\n\t";
5965	Preamble += "unsigned long *mutationsPtr;\n\t";
5966	Preamble += "unsigned long extra[5];\n};\n";
5967	Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
5968	Preamble += "#define __FASTENUMERATIONSTATE\n";
5969	Preamble += "#endif\n";
5970	Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
5971	Preamble += "struct __NSConstantStringImpl {\n";
5972	Preamble += " int *isa;\n";
5973	Preamble += " int flags;\n";
5974	Preamble += " char *str;\n";
5975	Preamble += "#if _WIN64\n";
5976	Preamble += " long long length;\n";
5977	Preamble += "#else\n";
5978	Preamble += " long length;\n";
5979	Preamble += "#endif\n";
5980	Preamble += "};\n";
5981	Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
5982	Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
5983	Preamble += "#else\n";
5984	Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
5985	Preamble += "#endif\n";
5986	Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
5987	Preamble += "#endif\n";
5988	// Blocks preamble.
5989	Preamble += "#ifndef BLOCK_IMPL\n";
5990	Preamble += "#define BLOCK_IMPL\n";
5991	Preamble += "struct __block_impl {\n";
5992	Preamble += " void *isa;\n";
5993	Preamble += " int Flags;\n";
5994	Preamble += " int Reserved;\n";
5995	Preamble += " void *FuncPtr;\n";
5996	Preamble += "};\n";
5997	Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
5998	Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
5999	Preamble += "extern \"C\" __declspec(dllexport) "
6000	"void _Block_object_assign(void , const void , const int);\n";
6001	Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
6002	Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
6003	Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
6004	Preamble += "#else\n";
6005	Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void , const void , const int);\n";
6006	Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
6007	Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
6008	Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
6009	Preamble += "#endif\n";
6010	Preamble += "#endif\n";
6011	if (LangOpts.MicrosoftExt) {
6012	Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
6013	Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
6014	Preamble += "#ifndef KEEP_ATTRIBUTES\n"; // We use this for clang tests.
6015	Preamble += "#define __attribute__(X)\n";
6016	Preamble += "#endif\n";
6017	Preamble += "#ifndef __weak\n";
6018	Preamble += "#define __weak\n";
6019	Preamble += "#endif\n";
6020	Preamble += "#ifndef __block\n";
6021	Preamble += "#define __block\n";
6022	Preamble += "#endif\n";
6023	}
6024	else {
6025	Preamble += "#define __block\n";
6026	Preamble += "#define __weak\n";
6027	}
6028
6029	// Declarations required for modern objective-c array and dictionary literals.
6030	Preamble += "\n#include <stdarg.h>\n";
6031	Preamble += "struct __NSContainer_literal {\n";
6032	Preamble += " void * *arr;\n";
6033	Preamble += " __NSContainer_literal (unsigned int count, ...) {\n";
6034	Preamble += "\tva_list marker;\n";
6035	Preamble += "\tva_start(marker, count);\n";
6036	Preamble += "\tarr = new void *[count];\n";
6037	Preamble += "\tfor (unsigned i = 0; i < count; i++)\n";
6038	Preamble += "\t arr[i] = va_arg(marker, void *);\n";
6039	Preamble += "\tva_end( marker );\n";
6040	Preamble += " };\n";
6041	Preamble += " ~__NSContainer_literal() {\n";
6042	Preamble += "\tdelete[] arr;\n";
6043	Preamble += " }\n";
6044	Preamble += "};\n";
6045
6046	// Declaration required for implementation of @autoreleasepool statement.
6047	Preamble += "extern \"C\" __declspec(dllimport) void * objc_autoreleasePoolPush(void);\n";
6048	Preamble += "extern \"C\" __declspec(dllimport) void objc_autoreleasePoolPop(void *);\n\n";
6049	Preamble += "struct __AtAutoreleasePool {\n";
6050	Preamble += " __AtAutoreleasePool() {atautoreleasepoolobj = objc_autoreleasePoolPush();}\n";
6051	Preamble += " ~__AtAutoreleasePool() {objc_autoreleasePoolPop(atautoreleasepoolobj);}\n";
6052	Preamble += " void * atautoreleasepoolobj;\n";
6053	Preamble += "};\n";
6054
6055	// NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
6056	// as this avoids warning in any 64bit/32bit compilation model.
6057	Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
6058	}
6059
6060	/// RewriteIvarOffsetComputation - This routine synthesizes computation of
6061	/// ivar offset.
6062	void RewriteModernObjC::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
6063	std::string &Result) {
6064	Result += "__OFFSETOFIVAR__(struct ";
6065	Result += ivar->getContainingInterface()->getNameAsString();
6066	if (LangOpts.MicrosoftExt)
6067	Result += "_IMPL";
6068	Result += ", ";
6069	if (ivar->isBitField())
6070	ObjCIvarBitfieldGroupDecl(ivar, Result);
6071	else
6072	Result += ivar->getNameAsString();
6073	Result += ")";
6074	}
6075
6076	/// WriteModernMetadataDeclarations - Writes out metadata declarations for modern ABI.
6077	/// struct _prop_t {
6078	/// const char *name;
6079	/// char *attributes;
6080	/// }
6081
6082	/// struct _prop_list_t {
6083	/// uint32_t entsize; // sizeof(struct _prop_t)
6084	/// uint32_t count_of_properties;
6085	/// struct _prop_t prop_list[count_of_properties];
6086	/// }
6087
6088	/// struct _protocol_t;
6089
6090	/// struct _protocol_list_t {
6091	/// long protocol_count; // Note, this is 32/64 bit
6092	/// struct _protocol_t * protocol_list[protocol_count];
6093	/// }
6094
6095	/// struct _objc_method {
6096	/// SEL _cmd;
6097	/// const char *method_type;
6098	/// char *_imp;
6099	/// }
6100
6101	/// struct _method_list_t {
6102	/// uint32_t entsize; // sizeof(struct _objc_method)
6103	/// uint32_t method_count;
6104	/// struct _objc_method method_list[method_count];
6105	/// }
6106
6107	/// struct _protocol_t {
6108	/// id isa; // NULL
6109	/// const char *protocol_name;
6110	/// const struct _protocol_list_t * protocol_list; // super protocols
6111	/// const struct method_list_t *instance_methods;
6112	/// const struct method_list_t *class_methods;
6113	/// const struct method_list_t *optionalInstanceMethods;
6114	/// const struct method_list_t *optionalClassMethods;
6115	/// const struct _prop_list_t * properties;
6116	/// const uint32_t size; // sizeof(struct _protocol_t)
6117	/// const uint32_t flags; // = 0
6118	/// const char ** extendedMethodTypes;
6119	/// }
6120
6121	/// struct _ivar_t {
6122	/// unsigned long int *offset; // pointer to ivar offset location
6123	/// const char *name;
6124	/// const char *type;
6125	/// uint32_t alignment;
6126	/// uint32_t size;
6127	/// }
6128
6129	/// struct _ivar_list_t {
6130	/// uint32 entsize; // sizeof(struct _ivar_t)
6131	/// uint32 count;
6132	/// struct _ivar_t list[count];
6133	/// }
6134
6135	/// struct _class_ro_t {
6136	/// uint32_t flags;
6137	/// uint32_t instanceStart;
6138	/// uint32_t instanceSize;
6139	/// uint32_t reserved; // only when building for 64bit targets
6140	/// const uint8_t *ivarLayout;
6141	/// const char *name;
6142	/// const struct _method_list_t *baseMethods;
6143	/// const struct _protocol_list_t *baseProtocols;
6144	/// const struct _ivar_list_t *ivars;
6145	/// const uint8_t *weakIvarLayout;
6146	/// const struct _prop_list_t *properties;
6147	/// }
6148
6149	/// struct _class_t {
6150	/// struct _class_t *isa;
6151	/// struct _class_t *superclass;
6152	/// void *cache;
6153	/// IMP *vtable;
6154	/// struct _class_ro_t *ro;
6155	/// }
6156
6157	/// struct _category_t {
6158	/// const char *name;
6159	/// struct _class_t *cls;
6160	/// const struct _method_list_t *instance_methods;
6161	/// const struct _method_list_t *class_methods;
6162	/// const struct _protocol_list_t *protocols;
6163	/// const struct _prop_list_t *properties;
6164	/// }
6165
6166	/// MessageRefTy - LLVM for:
6167	/// struct _message_ref_t {
6168	/// IMP messenger;
6169	/// SEL name;
6170	/// };
6171
6172	/// SuperMessageRefTy - LLVM for:
6173	/// struct _super_message_ref_t {
6174	/// SUPER_IMP messenger;
6175	/// SEL name;
6176	/// };
6177
6178	static void WriteModernMetadataDeclarations(ASTContext *Context, std::string &Result) {
6179	static bool meta_data_declared = false;
6180	if (meta_data_declared)
6181	return;
6182
6183	Result += "\nstruct _prop_t {\n";
6184	Result += "\tconst char *name;\n";
6185	Result += "\tconst char *attributes;\n";
6186	Result += "};\n";
6187
6188	Result += "\nstruct _protocol_t;\n";
6189
6190	Result += "\nstruct _objc_method {\n";
6191	Result += "\tstruct objc_selector * _cmd;\n";
6192	Result += "\tconst char *method_type;\n";
6193	Result += "\tvoid *_imp;\n";
6194	Result += "};\n";
6195
6196	Result += "\nstruct _protocol_t {\n";
6197	Result += "\tvoid * isa; // NULL\n";
6198	Result += "\tconst char *protocol_name;\n";
6199	Result += "\tconst struct _protocol_list_t * protocol_list; // super protocols\n";
6200	Result += "\tconst struct method_list_t *instance_methods;\n";
6201	Result += "\tconst struct method_list_t *class_methods;\n";
6202	Result += "\tconst struct method_list_t *optionalInstanceMethods;\n";
6203	Result += "\tconst struct method_list_t *optionalClassMethods;\n";
6204	Result += "\tconst struct _prop_list_t * properties;\n";
6205	Result += "\tconst unsigned int size; // sizeof(struct _protocol_t)\n";
6206	Result += "\tconst unsigned int flags; // = 0\n";
6207	Result += "\tconst char ** extendedMethodTypes;\n";
6208	Result += "};\n";
6209
6210	Result += "\nstruct _ivar_t {\n";
6211	Result += "\tunsigned long int *offset; // pointer to ivar offset location\n";
6212	Result += "\tconst char *name;\n";
6213	Result += "\tconst char *type;\n";
6214	Result += "\tunsigned int alignment;\n";
6215	Result += "\tunsigned int size;\n";
6216	Result += "};\n";
6217
6218	Result += "\nstruct _class_ro_t {\n";
6219	Result += "\tunsigned int flags;\n";
6220	Result += "\tunsigned int instanceStart;\n";
6221	Result += "\tunsigned int instanceSize;\n";
6222	const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6223	if (Triple.getArch() == llvm::Triple::x86_64)
6224	Result += "\tunsigned int reserved;\n";
6225	Result += "\tconst unsigned char *ivarLayout;\n";
6226	Result += "\tconst char *name;\n";
6227	Result += "\tconst struct _method_list_t *baseMethods;\n";
6228	Result += "\tconst struct _objc_protocol_list *baseProtocols;\n";
6229	Result += "\tconst struct _ivar_list_t *ivars;\n";
6230	Result += "\tconst unsigned char *weakIvarLayout;\n";
6231	Result += "\tconst struct _prop_list_t *properties;\n";
6232	Result += "};\n";
6233
6234	Result += "\nstruct _class_t {\n";
6235	Result += "\tstruct _class_t *isa;\n";
6236	Result += "\tstruct _class_t *superclass;\n";
6237	Result += "\tvoid *cache;\n";
6238	Result += "\tvoid *vtable;\n";
6239	Result += "\tstruct _class_ro_t *ro;\n";
6240	Result += "};\n";
6241
6242	Result += "\nstruct _category_t {\n";
6243	Result += "\tconst char *name;\n";
6244	Result += "\tstruct _class_t *cls;\n";
6245	Result += "\tconst struct _method_list_t *instance_methods;\n";
6246	Result += "\tconst struct _method_list_t *class_methods;\n";
6247	Result += "\tconst struct _protocol_list_t *protocols;\n";
6248	Result += "\tconst struct _prop_list_t *properties;\n";
6249	Result += "};\n";
6250
6251	Result += "extern \"C\" __declspec(dllimport) struct objc_cache _objc_empty_cache;\n";
6252	Result += "#pragma warning(disable:4273)\n";
6253	meta_data_declared = true;
6254	}
6255
6256	static void Write_protocol_list_t_TypeDecl(std::string &Result,
6257	long super_protocol_count) {
6258	Result += "struct /_protocol_list_t/"; Result += " {\n";
6259	Result += "\tlong protocol_count; // Note, this is 32/64 bit\n";
6260	Result += "\tstruct _protocol_t *super_protocols[";
6261	Result += utostr(super_protocol_count); Result += "];\n";
6262	Result += "}";
6263	}
6264
6265	static void Write_method_list_t_TypeDecl(std::string &Result,
6266	unsigned int method_count) {
6267	Result += "struct /_method_list_t/"; Result += " {\n";
6268	Result += "\tunsigned int entsize; // sizeof(struct _objc_method)\n";
6269	Result += "\tunsigned int method_count;\n";
6270	Result += "\tstruct _objc_method method_list[";
6271	Result += utostr(method_count); Result += "];\n";
6272	Result += "}";
6273	}
6274
6275	static void Write__prop_list_t_TypeDecl(std::string &Result,
6276	unsigned int property_count) {
6277	Result += "struct /_prop_list_t/"; Result += " {\n";
6278	Result += "\tunsigned int entsize; // sizeof(struct _prop_t)\n";
6279	Result += "\tunsigned int count_of_properties;\n";
6280	Result += "\tstruct _prop_t prop_list[";
6281	Result += utostr(property_count); Result += "];\n";
6282	Result += "}";
6283	}
6284
6285	static void Write__ivar_list_t_TypeDecl(std::string &Result,
6286	unsigned int ivar_count) {
6287	Result += "struct /_ivar_list_t/"; Result += " {\n";
6288	Result += "\tunsigned int entsize; // sizeof(struct _prop_t)\n";
6289	Result += "\tunsigned int count;\n";
6290	Result += "\tstruct _ivar_t ivar_list[";
6291	Result += utostr(ivar_count); Result += "];\n";
6292	Result += "}";
6293	}
6294
6295	static void Write_protocol_list_initializer(ASTContext *Context, std::string &Result,
6296	ArrayRef<ObjCProtocolDecl *> SuperProtocols,
6297	StringRef VarName,
6298	StringRef ProtocolName) {
6299	if (SuperProtocols.size() > 0) {
6300	Result += "\nstatic ";
6301	Write_protocol_list_t_TypeDecl(Result, SuperProtocols.size());
6302	Result += " "; Result += VarName;
6303	Result += ProtocolName;
6304	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6305	Result += "\t"; Result += utostr(SuperProtocols.size()); Result += ",\n";
6306	for (unsigned i = 0, e = SuperProtocols.size(); i < e; i++) {
6307	ObjCProtocolDecl *SuperPD = SuperProtocols[i];
6308	Result += "\t&"; Result += "_OBJC_PROTOCOL_";
6309	Result += SuperPD->getNameAsString();
6310	if (i == e-1)
6311	Result += "\n};\n";
6312	else
6313	Result += ",\n";
6314	}
6315	}
6316	}
6317
6318	static void Write_method_list_t_initializer(RewriteModernObjC &RewriteObj,
6319	ASTContext *Context, std::string &Result,
6320	ArrayRef<ObjCMethodDecl *> Methods,
6321	StringRef VarName,
6322	StringRef TopLevelDeclName,
6323	bool MethodImpl) {
6324	if (Methods.size() > 0) {
6325	Result += "\nstatic ";
6326	Write_method_list_t_TypeDecl(Result, Methods.size());
6327	Result += " "; Result += VarName;
6328	Result += TopLevelDeclName;
6329	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6330	Result += "\t"; Result += "sizeof(_objc_method)"; Result += ",\n";
6331	Result += "\t"; Result += utostr(Methods.size()); Result += ",\n";
6332	for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6333	ObjCMethodDecl *MD = Methods[i];
6334	if (i == 0)
6335	Result += "\t{{(struct objc_selector *)\"";
6336	else
6337	Result += "\t{(struct objc_selector *)\"";
6338	Result += (MD)->getSelector().getAsString(); Result += "\"";
6339	Result += ", ";
6340	std::string MethodTypeString = Context->getObjCEncodingForMethodDecl(MD);
6341	Result += "\""; Result += MethodTypeString; Result += "\"";
6342	Result += ", ";
6343	if (!MethodImpl)
6344	Result += "0";
6345	else {
6346	Result += "(void *)";
6347	Result += RewriteObj.MethodInternalNames[MD];
6348	}
6349	if (i == e-1)
6350	Result += "}}\n";
6351	else
6352	Result += "},\n";
6353	}
6354	Result += "};\n";
6355	}
6356	}
6357
6358	static void Write_prop_list_t_initializer(RewriteModernObjC &RewriteObj,
6359	ASTContext *Context, std::string &Result,
6360	ArrayRef<ObjCPropertyDecl *> Properties,
6361	const Decl *Container,
6362	StringRef VarName,
6363	StringRef ProtocolName) {
6364	if (Properties.size() > 0) {
6365	Result += "\nstatic ";
6366	Write__prop_list_t_TypeDecl(Result, Properties.size());
6367	Result += " "; Result += VarName;
6368	Result += ProtocolName;
6369	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6370	Result += "\t"; Result += "sizeof(_prop_t)"; Result += ",\n";
6371	Result += "\t"; Result += utostr(Properties.size()); Result += ",\n";
6372	for (unsigned i = 0, e = Properties.size(); i < e; i++) {
6373	ObjCPropertyDecl *PropDecl = Properties[i];
6374	if (i == 0)
6375	Result += "\t{{\"";
6376	else
6377	Result += "\t{\"";
6378	Result += PropDecl->getName(); Result += "\",";
6379	std::string PropertyTypeString =
6380	Context->getObjCEncodingForPropertyDecl(PropDecl, Container);
6381	std::string QuotePropertyTypeString;
6382	RewriteObj.QuoteDoublequotes(PropertyTypeString, QuotePropertyTypeString);
6383	Result += "\""; Result += QuotePropertyTypeString; Result += "\"";
6384	if (i == e-1)
6385	Result += "}}\n";
6386	else
6387	Result += "},\n";
6388	}
6389	Result += "};\n";
6390	}
6391	}
6392
6393	// Metadata flags
6394	enum MetaDataDlags {
6395	CLS = 0x0,
6396	CLS_META = 0x1,
6397	CLS_ROOT = 0x2,
6398	OBJC2_CLS_HIDDEN = 0x10,
6399	CLS_EXCEPTION = 0x20,
6400
6401	/// (Obsolete) ARC-specific: this class has a .release_ivars method
6402	CLS_HAS_IVAR_RELEASER = 0x40,
6403	/// class was compiled with -fobjc-arr
6404	CLS_COMPILED_BY_ARC = 0x80 // (1<<7)
6405	};
6406
6407	static void Write__class_ro_t_initializer(ASTContext *Context, std::string &Result,
6408	unsigned int flags,
6409	const std::string &InstanceStart,
6410	const std::string &InstanceSize,
6411	ArrayRef<ObjCMethodDecl *>baseMethods,
6412	ArrayRef<ObjCProtocolDecl *>baseProtocols,
6413	ArrayRef<ObjCIvarDecl *>ivars,
6414	ArrayRef<ObjCPropertyDecl *>Properties,
6415	StringRef VarName,
6416	StringRef ClassName) {
6417	Result += "\nstatic struct _class_ro_t ";
6418	Result += VarName; Result += ClassName;
6419	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6420	Result += "\t";
6421	Result += llvm::utostr(flags); Result += ", ";
6422	Result += InstanceStart; Result += ", ";
6423	Result += InstanceSize; Result += ", \n";
6424	Result += "\t";
6425	const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6426	if (Triple.getArch() == llvm::Triple::x86_64)
6427	// uint32_t const reserved; // only when building for 64bit targets
6428	Result += "(unsigned int)0, \n\t";
6429	// const uint8_t * const ivarLayout;
6430	Result += "0, \n\t";
6431	Result += "\""; Result += ClassName; Result += "\",\n\t";
6432	bool metaclass = ((flags & CLS_META) != 0);
6433	if (baseMethods.size() > 0) {
6434	Result += "(const struct _method_list_t *)&";
6435	if (metaclass)
6436	Result += "_OBJC_$_CLASS_METHODS_";
6437	else
6438	Result += "_OBJC_$_INSTANCE_METHODS_";
6439	Result += ClassName;
6440	Result += ",\n\t";
6441	}
6442	else
6443	Result += "0, \n\t";
6444
6445	if (!metaclass && baseProtocols.size() > 0) {
6446	Result += "(const struct _objc_protocol_list *)&";
6447	Result += "_OBJC_CLASS_PROTOCOLS_$_"; Result += ClassName;
6448	Result += ",\n\t";
6449	}
6450	else
6451	Result += "0, \n\t";
6452
6453	if (!metaclass && ivars.size() > 0) {
6454	Result += "(const struct _ivar_list_t *)&";
6455	Result += "_OBJC_$_INSTANCE_VARIABLES_"; Result += ClassName;
6456	Result += ",\n\t";
6457	}
6458	else
6459	Result += "0, \n\t";
6460
6461	// weakIvarLayout
6462	Result += "0, \n\t";
6463	if (!metaclass && Properties.size() > 0) {
6464	Result += "(const struct _prop_list_t *)&";
6465	Result += "_OBJC_$_PROP_LIST_"; Result += ClassName;
6466	Result += ",\n";
6467	}
6468	else
6469	Result += "0, \n";
6470
6471	Result += "};\n";
6472	}
6473
6474	static void Write_class_t(ASTContext *Context, std::string &Result,
6475	StringRef VarName,
6476	const ObjCInterfaceDecl *CDecl, bool metaclass) {
6477	bool rootClass = (!CDecl->getSuperClass());
6478	const ObjCInterfaceDecl *RootClass = CDecl;
6479
6480	if (!rootClass) {
6481	// Find the Root class
6482	RootClass = CDecl->getSuperClass();
6483	while (RootClass->getSuperClass()) {
6484	RootClass = RootClass->getSuperClass();
6485	}
6486	}
6487
6488	if (metaclass && rootClass) {
6489	// Need to handle a case of use of forward declaration.
6490	Result += "\n";
6491	Result += "extern \"C\" ";
6492	if (CDecl->getImplementation())
6493	Result += "__declspec(dllexport) ";
6494	else
6495	Result += "__declspec(dllimport) ";
6496
6497	Result += "struct _class_t OBJC_CLASS_$_";
6498	Result += CDecl->getNameAsString();
6499	Result += ";\n";
6500	}
6501	// Also, for possibility of 'super' metadata class not having been defined yet.
6502	if (!rootClass) {
6503	ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
6504	Result += "\n";
6505	Result += "extern \"C\" ";
6506	if (SuperClass->getImplementation())
6507	Result += "__declspec(dllexport) ";
6508	else
6509	Result += "__declspec(dllimport) ";
6510
6511	Result += "struct _class_t ";
6512	Result += VarName;
6513	Result += SuperClass->getNameAsString();
6514	Result += ";\n";
6515
6516	if (metaclass && RootClass != SuperClass) {
6517	Result += "extern \"C\" ";
6518	if (RootClass->getImplementation())
6519	Result += "__declspec(dllexport) ";
6520	else
6521	Result += "__declspec(dllimport) ";
6522
6523	Result += "struct _class_t ";
6524	Result += VarName;
6525	Result += RootClass->getNameAsString();
6526	Result += ";\n";
6527	}
6528	}
6529
6530	Result += "\nextern \"C\" __declspec(dllexport) struct _class_t ";
6531	Result += VarName; Result += CDecl->getNameAsString();
6532	Result += " __attribute__ ((used, section (\"__DATA,__objc_data\"))) = {\n";
6533	Result += "\t";
6534	if (metaclass) {
6535	if (!rootClass) {
6536	Result += "0, // &"; Result += VarName;
6537	Result += RootClass->getNameAsString();
6538	Result += ",\n\t";
6539	Result += "0, // &"; Result += VarName;
6540	Result += CDecl->getSuperClass()->getNameAsString();
6541	Result += ",\n\t";
6542	}
6543	else {
6544	Result += "0, // &"; Result += VarName;
6545	Result += CDecl->getNameAsString();
6546	Result += ",\n\t";
6547	Result += "0, // &OBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6548	Result += ",\n\t";
6549	}
6550	}
6551	else {
6552	Result += "0, // &OBJC_METACLASS_$_";
6553	Result += CDecl->getNameAsString();
6554	Result += ",\n\t";
6555	if (!rootClass) {
6556	Result += "0, // &"; Result += VarName;
6557	Result += CDecl->getSuperClass()->getNameAsString();
6558	Result += ",\n\t";
6559	}
6560	else
6561	Result += "0,\n\t";
6562	}
6563	Result += "0, // (void *)&_objc_empty_cache,\n\t";
6564	Result += "0, // unused, was (void *)&_objc_empty_vtable,\n\t";
6565	if (metaclass)
6566	Result += "&_OBJC_METACLASS_RO_$_";
6567	else
6568	Result += "&_OBJC_CLASS_RO_$_";
6569	Result += CDecl->getNameAsString();
6570	Result += ",\n};\n";
6571
6572	// Add static function to initialize some of the meta-data fields.
6573	// avoid doing it twice.
6574	if (metaclass)
6575	return;
6576
6577	const ObjCInterfaceDecl *SuperClass =
6578	rootClass ? CDecl : CDecl->getSuperClass();
6579
6580	Result += "static void OBJC_CLASS_SETUP_$_";
6581	Result += CDecl->getNameAsString();
6582	Result += "(void ) {\n";
6583	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6584	Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6585	Result += RootClass->getNameAsString(); Result += ";\n";
6586
6587	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6588	Result += ".superclass = ";
6589	if (rootClass)
6590	Result += "&OBJC_CLASS_$_";
6591	else
6592	Result += "&OBJC_METACLASS_$_";
6593
6594	Result += SuperClass->getNameAsString(); Result += ";\n";
6595
6596	Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6597	Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6598
6599	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6600	Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6601	Result += CDecl->getNameAsString(); Result += ";\n";
6602
6603	if (!rootClass) {
6604	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6605	Result += ".superclass = "; Result += "&OBJC_CLASS_$_";
6606	Result += SuperClass->getNameAsString(); Result += ";\n";
6607	}
6608
6609	Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6610	Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6611	Result += "}\n";
6612	}
6613
6614	static void Write_category_t(RewriteModernObjC &RewriteObj, ASTContext *Context,
6615	std::string &Result,
6616	ObjCCategoryDecl *CatDecl,
6617	ObjCInterfaceDecl *ClassDecl,
6618	ArrayRef<ObjCMethodDecl *> InstanceMethods,
6619	ArrayRef<ObjCMethodDecl *> ClassMethods,
6620	ArrayRef<ObjCProtocolDecl *> RefedProtocols,
6621	ArrayRef<ObjCPropertyDecl *> ClassProperties) {
6622	StringRef CatName = CatDecl->getName();
6623	StringRef ClassName = ClassDecl->getName();
6624	// must declare an extern class object in case this class is not implemented
6625	// in this TU.
6626	Result += "\n";
6627	Result += "extern \"C\" ";
6628	if (ClassDecl->getImplementation())
6629	Result += "__declspec(dllexport) ";
6630	else
6631	Result += "__declspec(dllimport) ";
6632
6633	Result += "struct _class_t ";
6634	Result += "OBJC_CLASS_$_"; Result += ClassName;
6635	Result += ";\n";
6636
6637	Result += "\nstatic struct _category_t ";
6638	Result += "_OBJC_$_CATEGORY_";
6639	Result += ClassName; Result += "_$_"; Result += CatName;
6640	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6641	Result += "{\n";
6642	Result += "\t\""; Result += ClassName; Result += "\",\n";
6643	Result += "\t0, // &"; Result += "OBJC_CLASS_$_"; Result += ClassName;
6644	Result += ",\n";
6645	if (InstanceMethods.size() > 0) {
6646	Result += "\t(const struct _method_list_t *)&";
6647	Result += "_OBJC_$_CATEGORY_INSTANCE_METHODS_";
6648	Result += ClassName; Result += "_$_"; Result += CatName;
6649	Result += ",\n";
6650	}
6651	else
6652	Result += "\t0,\n";
6653
6654	if (ClassMethods.size() > 0) {
6655	Result += "\t(const struct _method_list_t *)&";
6656	Result += "_OBJC_$_CATEGORY_CLASS_METHODS_";
6657	Result += ClassName; Result += "_$_"; Result += CatName;
6658	Result += ",\n";
6659	}
6660	else
6661	Result += "\t0,\n";
6662
6663	if (RefedProtocols.size() > 0) {
6664	Result += "\t(const struct _protocol_list_t *)&";
6665	Result += "_OBJC_CATEGORY_PROTOCOLS_$_";
6666	Result += ClassName; Result += "_$_"; Result += CatName;
6667	Result += ",\n";
6668	}
6669	else
6670	Result += "\t0,\n";
6671
6672	if (ClassProperties.size() > 0) {
6673	Result += "\t(const struct _prop_list_t *)&"; Result += "_OBJC_$_PROP_LIST_";
6674	Result += ClassName; Result += "_$_"; Result += CatName;
6675	Result += ",\n";
6676	}
6677	else
6678	Result += "\t0,\n";
6679
6680	Result += "};\n";
6681
6682	// Add static function to initialize the class pointer in the category structure.
6683	Result += "static void OBJC_CATEGORY_SETUP_$_";
6684	Result += ClassDecl->getNameAsString();
6685	Result += "_$_";
6686	Result += CatName;
6687	Result += "(void ) {\n";
6688	Result += "\t_OBJC_$_CATEGORY_";
6689	Result += ClassDecl->getNameAsString();
6690	Result += "_$_";
6691	Result += CatName;
6692	Result += ".cls = "; Result += "&OBJC_CLASS_$_"; Result += ClassName;
6693	Result += ";\n}\n";
6694	}
6695
6696	static void Write__extendedMethodTypes_initializer(RewriteModernObjC &RewriteObj,
6697	ASTContext *Context, std::string &Result,
6698	ArrayRef<ObjCMethodDecl *> Methods,
6699	StringRef VarName,
6700	StringRef ProtocolName) {
6701	if (Methods.size() == 0)
6702	return;
6703
6704	Result += "\nstatic const char *";
6705	Result += VarName; Result += ProtocolName;
6706	Result += " [] __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6707	Result += "{\n";
6708	for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6709	ObjCMethodDecl *MD = Methods[i];
6710	std::string MethodTypeString =
6711	Context->getObjCEncodingForMethodDecl(MD, true);
6712	std::string QuoteMethodTypeString;
6713	RewriteObj.QuoteDoublequotes(MethodTypeString, QuoteMethodTypeString);
6714	Result += "\t\""; Result += QuoteMethodTypeString; Result += "\"";
6715	if (i == e-1)
6716	Result += "\n};\n";
6717	else {
6718	Result += ",\n";
6719	}
6720	}
6721	}
6722
6723	static void Write_IvarOffsetVar(RewriteModernObjC &RewriteObj,
6724	ASTContext *Context,
6725	std::string &Result,
6726	ArrayRef<ObjCIvarDecl *> Ivars,
6727	ObjCInterfaceDecl *CDecl) {
6728	// FIXME. visibilty of offset symbols may have to be set; for Darwin
6729	// this is what happens:
6730	/**
6731	if (Ivar->getAccessControl() == ObjCIvarDecl::Private \|\|
6732	Ivar->getAccessControl() == ObjCIvarDecl::Package \|\|
6733	Class->getVisibility() == HiddenVisibility)
6734	Visibility should be: HiddenVisibility;
6735	else
6736	Visibility should be: DefaultVisibility;
6737	*/
6738
6739	Result += "\n";
6740	for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6741	ObjCIvarDecl *IvarDecl = Ivars[i];
6742	if (Context->getLangOpts().MicrosoftExt)
6743	Result += "__declspec(allocate(\".objc_ivar$B\")) ";
6744
6745	if (!Context->getLangOpts().MicrosoftExt \|\|
6746	IvarDecl->getAccessControl() == ObjCIvarDecl::Private \|\|
6747	IvarDecl->getAccessControl() == ObjCIvarDecl::Package)
6748	Result += "extern \"C\" unsigned long int ";
6749	else
6750	Result += "extern \"C\" __declspec(dllexport) unsigned long int ";
6751	if (Ivars[i]->isBitField())
6752	RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
6753	else
6754	WriteInternalIvarName(CDecl, IvarDecl, Result);
6755	Result += " __attribute__ ((used, section (\"__DATA,__objc_ivar\")))";
6756	Result += " = ";
6757	RewriteObj.RewriteIvarOffsetComputation(IvarDecl, Result);
6758	Result += ";\n";
6759	if (Ivars[i]->isBitField()) {
6760	// skip over rest of the ivar bitfields.
6761	SKIP_BITFIELDS(i , e, Ivars);
6762	}
6763	}
6764	}
6765
6766	static void Write__ivar_list_t_initializer(RewriteModernObjC &RewriteObj,
6767	ASTContext *Context, std::string &Result,
6768	ArrayRef<ObjCIvarDecl *> OriginalIvars,
6769	StringRef VarName,
6770	ObjCInterfaceDecl *CDecl) {
6771	if (OriginalIvars.size() > 0) {
6772	Write_IvarOffsetVar(RewriteObj, Context, Result, OriginalIvars, CDecl);
6773	SmallVector<ObjCIvarDecl *, 8> Ivars;
6774	// strip off all but the first ivar bitfield from each group of ivars.
6775	// Such ivars in the ivar list table will be replaced by their grouping struct
6776	// 'ivar'.
6777	for (unsigned i = 0, e = OriginalIvars.size(); i < e; i++) {
6778	if (OriginalIvars[i]->isBitField()) {
6779	Ivars.push_back(OriginalIvars[i]);
6780	// skip over rest of the ivar bitfields.
6781	SKIP_BITFIELDS(i , e, OriginalIvars);
6782	}
6783	else
6784	Ivars.push_back(OriginalIvars[i]);
6785	}
6786
6787	Result += "\nstatic ";
6788	Write__ivar_list_t_TypeDecl(Result, Ivars.size());
6789	Result += " "; Result += VarName;
6790	Result += CDecl->getNameAsString();
6791	Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6792	Result += "\t"; Result += "sizeof(_ivar_t)"; Result += ",\n";
6793	Result += "\t"; Result += utostr(Ivars.size()); Result += ",\n";
6794	for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6795	ObjCIvarDecl *IvarDecl = Ivars[i];
6796	if (i == 0)
6797	Result += "\t{{";
6798	else
6799	Result += "\t {";
6800	Result += "(unsigned long int *)&";
6801	if (Ivars[i]->isBitField())
6802	RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
6803	else
6804	WriteInternalIvarName(CDecl, IvarDecl, Result);
6805	Result += ", ";
6806
6807	Result += "\"";
6808	if (Ivars[i]->isBitField())
6809	RewriteObj.ObjCIvarBitfieldGroupDecl(Ivars[i], Result);
6810	else
6811	Result += IvarDecl->getName();
6812	Result += "\", ";
6813
6814	QualType IVQT = IvarDecl->getType();
6815	if (IvarDecl->isBitField())
6816	IVQT = RewriteObj.GetGroupRecordTypeForObjCIvarBitfield(IvarDecl);
6817
6818	std::string IvarTypeString, QuoteIvarTypeString;
6819	Context->getObjCEncodingForType(IVQT, IvarTypeString,
6820	IvarDecl);
6821	RewriteObj.QuoteDoublequotes(IvarTypeString, QuoteIvarTypeString);
6822	Result += "\""; Result += QuoteIvarTypeString; Result += "\", ";
6823
6824	// FIXME. this alignment represents the host alignment and need be changed to
6825	// represent the target alignment.
6826	unsigned Align = Context->getTypeAlign(IVQT)/8;
6827	Align = llvm::Log2_32(Align);
6828	Result += llvm::utostr(Align); Result += ", ";
6829	CharUnits Size = Context->getTypeSizeInChars(IVQT);
6830	Result += llvm::utostr(Size.getQuantity());
6831	if (i == e-1)
6832	Result += "}}\n";
6833	else
6834	Result += "},\n";
6835	}
6836	Result += "};\n";
6837	}
6838	}
6839
6840	/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
6841	void RewriteModernObjC::RewriteObjCProtocolMetaData(ObjCProtocolDecl *PDecl,
6842	std::string &Result) {
6843
6844	// Do not synthesize the protocol more than once.
6845	if (ObjCSynthesizedProtocols.count(PDecl->getCanonicalDecl()))
6846	return;
6847	WriteModernMetadataDeclarations(Context, Result);
6848
6849	if (ObjCProtocolDecl *Def = PDecl->getDefinition())
6850	PDecl = Def;
6851	// Must write out all protocol definitions in current qualifier list,
6852	// and in their nested qualifiers before writing out current definition.
6853	for (auto *I : PDecl->protocols())
6854	RewriteObjCProtocolMetaData(I, Result);
6855
6856	// Construct method lists.
6857	std::vector<ObjCMethodDecl *> InstanceMethods, ClassMethods;
6858	std::vector<ObjCMethodDecl *> OptInstanceMethods, OptClassMethods;
6859	for (auto *MD : PDecl->instance_methods()) {
6860	if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
6861	OptInstanceMethods.push_back(MD);
6862	} else {
6863	InstanceMethods.push_back(MD);
6864	}
6865	}
6866
6867	for (auto *MD : PDecl->class_methods()) {
6868	if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
6869	OptClassMethods.push_back(MD);
6870	} else {
6871	ClassMethods.push_back(MD);
6872	}
6873	}
6874	std::vector<ObjCMethodDecl *> AllMethods;
6875	for (unsigned i = 0, e = InstanceMethods.size(); i < e; i++)
6876	AllMethods.push_back(InstanceMethods[i]);
6877	for (unsigned i = 0, e = ClassMethods.size(); i < e; i++)
6878	AllMethods.push_back(ClassMethods[i]);
6879	for (unsigned i = 0, e = OptInstanceMethods.size(); i < e; i++)
6880	AllMethods.push_back(OptInstanceMethods[i]);
6881	for (unsigned i = 0, e = OptClassMethods.size(); i < e; i++)
6882	AllMethods.push_back(OptClassMethods[i]);
6883
6884	Write__extendedMethodTypes_initializer(*this, Context, Result,
6885	AllMethods,
6886	"_OBJC_PROTOCOL_METHOD_TYPES_",
6887	PDecl->getNameAsString());
6888	// Protocol's super protocol list
6889	SmallVector<ObjCProtocolDecl *, 8> SuperProtocols(PDecl->protocols());
6890	Write_protocol_list_initializer(Context, Result, SuperProtocols,
6891	"_OBJC_PROTOCOL_REFS_",
6892	PDecl->getNameAsString());
6893
6894	Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
6895	"_OBJC_PROTOCOL_INSTANCE_METHODS_",
6896	PDecl->getNameAsString(), false);
6897
6898	Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
6899	"_OBJC_PROTOCOL_CLASS_METHODS_",
6900	PDecl->getNameAsString(), false);
6901
6902	Write_method_list_t_initializer(*this, Context, Result, OptInstanceMethods,
6903	"_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_",
6904	PDecl->getNameAsString(), false);
6905
6906	Write_method_list_t_initializer(*this, Context, Result, OptClassMethods,
6907	"_OBJC_PROTOCOL_OPT_CLASS_METHODS_",
6908	PDecl->getNameAsString(), false);
6909
6910	// Protocol's property metadata.
6911	SmallVector<ObjCPropertyDecl *, 8> ProtocolProperties(
6912	PDecl->instance_properties());
6913	Write_prop_list_t_initializer(*this, Context, Result, ProtocolProperties,
6914	/* Container */nullptr,
6915	"_OBJC_PROTOCOL_PROPERTIES_",
6916	PDecl->getNameAsString());
6917
6918	// Writer out root metadata for current protocol: struct _protocol_t
6919	Result += "\n";
6920	if (LangOpts.MicrosoftExt)
6921	Result += "static ";
6922	Result += "struct _protocol_t _OBJC_PROTOCOL_";
6923	Result += PDecl->getNameAsString();
6924	Result += " __attribute__ ((used)) = {\n";
6925	Result += "\t0,\n"; // id is; is null
6926	Result += "\t\""; Result += PDecl->getNameAsString(); Result += "\",\n";
6927	if (SuperProtocols.size() > 0) {
6928	Result += "\t(const struct _protocol_list_t *)&"; Result += "_OBJC_PROTOCOL_REFS_";
6929	Result += PDecl->getNameAsString(); Result += ",\n";
6930	}
6931	else
6932	Result += "\t0,\n";
6933	if (InstanceMethods.size() > 0) {
6934	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
6935	Result += PDecl->getNameAsString(); Result += ",\n";
6936	}
6937	else
6938	Result += "\t0,\n";
6939
6940	if (ClassMethods.size() > 0) {
6941	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_CLASS_METHODS_";
6942	Result += PDecl->getNameAsString(); Result += ",\n";
6943	}
6944	else
6945	Result += "\t0,\n";
6946
6947	if (OptInstanceMethods.size() > 0) {
6948	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_";
6949	Result += PDecl->getNameAsString(); Result += ",\n";
6950	}
6951	else
6952	Result += "\t0,\n";
6953
6954	if (OptClassMethods.size() > 0) {
6955	Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_CLASS_METHODS_";
6956	Result += PDecl->getNameAsString(); Result += ",\n";
6957	}
6958	else
6959	Result += "\t0,\n";
6960
6961	if (ProtocolProperties.size() > 0) {
6962	Result += "\t(const struct _prop_list_t *)&_OBJC_PROTOCOL_PROPERTIES_";
6963	Result += PDecl->getNameAsString(); Result += ",\n";
6964	}
6965	else
6966	Result += "\t0,\n";
6967
6968	Result += "\t"; Result += "sizeof(_protocol_t)"; Result += ",\n";
6969	Result += "\t0,\n";
6970
6971	if (AllMethods.size() > 0) {
6972	Result += "\t(const char **)&"; Result += "_OBJC_PROTOCOL_METHOD_TYPES_";
6973	Result += PDecl->getNameAsString();
6974	Result += "\n};\n";
6975	}
6976	else
6977	Result += "\t0\n};\n";
6978
6979	if (LangOpts.MicrosoftExt)
6980	Result += "static ";
6981	Result += "struct _protocol_t *";
6982	Result += "_OBJC_LABEL_PROTOCOL_$_"; Result += PDecl->getNameAsString();
6983	Result += " = &_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
6984	Result += ";\n";
6985
6986	// Mark this protocol as having been generated.
6987	if (!ObjCSynthesizedProtocols.insert(PDecl->getCanonicalDecl()).second)
6988	llvm_unreachable("protocol already synthesized");
6989	}
6990
6991	/// hasObjCExceptionAttribute - Return true if this class or any super
6992	/// class has the __objc_exception__ attribute.
6993	/// FIXME. Move this to ASTContext.cpp as it is also used for IRGen.
6994	static bool hasObjCExceptionAttribute(ASTContext &Context,
6995	const ObjCInterfaceDecl *OID) {
6996	if (OID->hasAttr<ObjCExceptionAttr>())
6997	return true;
6998	if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
6999	return hasObjCExceptionAttribute(Context, Super);
7000	return false;
7001	}
7002
7003	void RewriteModernObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
7004	std::string &Result) {
7005	ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7006
7007	// Explicitly declared @interface's are already synthesized.
7008	if (CDecl->isImplicitInterfaceDecl())
7009	assert(false &&
7010	"Legacy implicit interface rewriting not supported in moder abi");
7011
7012	WriteModernMetadataDeclarations(Context, Result);
7013	SmallVector<ObjCIvarDecl *, 8> IVars;
7014
7015	for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7016	IVD; IVD = IVD->getNextIvar()) {
7017	// Ignore unnamed bit-fields.
7018	if (!IVD->getDeclName())
7019	continue;
7020	IVars.push_back(IVD);
7021	}
7022
7023	Write__ivar_list_t_initializer(*this, Context, Result, IVars,
7024	"_OBJC_$_INSTANCE_VARIABLES_",
7025	CDecl);
7026
7027	// Build _objc_method_list for class's instance methods if needed
7028	SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7029
7030	// If any of our property implementations have associated getters or
7031	// setters, produce metadata for them as well.
7032	for (const auto *Prop : IDecl->property_impls()) {
7033	if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7034	continue;
7035	if (!Prop->getPropertyIvarDecl())
7036	continue;
7037	ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7038	if (!PD)
7039	continue;
7040	if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
7041	if (mustSynthesizeSetterGetterMethod(IDecl, PD, true /getter/))
7042	InstanceMethods.push_back(Getter);
7043	if (PD->isReadOnly())
7044	continue;
7045	if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
7046	if (mustSynthesizeSetterGetterMethod(IDecl, PD, false /setter/))
7047	InstanceMethods.push_back(Setter);
7048	}
7049
7050	Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
7051	"_OBJC_$_INSTANCE_METHODS_",
7052	IDecl->getNameAsString(), true);
7053
7054	SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7055
7056	Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
7057	"_OBJC_$_CLASS_METHODS_",
7058	IDecl->getNameAsString(), true);
7059
7060	// Protocols referenced in class declaration?
7061	// Protocol's super protocol list
7062	std::vector<ObjCProtocolDecl *> RefedProtocols;
7063	const ObjCList<ObjCProtocolDecl> &Protocols = CDecl->getReferencedProtocols();
7064	for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
7065	E = Protocols.end();
7066	I != E; ++I) {
7067	RefedProtocols.push_back(*I);
7068	// Must write out all protocol definitions in current qualifier list,
7069	// and in their nested qualifiers before writing out current definition.
7070	RewriteObjCProtocolMetaData(*I, Result);
7071	}
7072
7073	Write_protocol_list_initializer(Context, Result,
7074	RefedProtocols,
7075	"_OBJC_CLASS_PROTOCOLS_$_",
7076	IDecl->getNameAsString());
7077
7078	// Protocol's property metadata.
7079	SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
7080	CDecl->instance_properties());
7081	Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7082	/* Container */IDecl,
7083	"_OBJC_$_PROP_LIST_",
7084	CDecl->getNameAsString());
7085
7086	// Data for initializing _class_ro_t metaclass meta-data
7087	uint32_t flags = CLS_META;
7088	std::string InstanceSize;
7089	std::string InstanceStart;
7090
7091	bool classIsHidden = CDecl->getVisibility() == HiddenVisibility;
7092	if (classIsHidden)
7093	flags \|= OBJC2_CLS_HIDDEN;
7094
7095	if (!CDecl->getSuperClass())
7096	// class is root
7097	flags \|= CLS_ROOT;
7098	InstanceSize = "sizeof(struct _class_t)";
7099	InstanceStart = InstanceSize;
7100	Write__class_ro_t_initializer(Context, Result, flags,
7101	InstanceStart, InstanceSize,
7102	ClassMethods,
7103	nullptr,
7104	nullptr,
7105	nullptr,
7106	"_OBJC_METACLASS_RO_$_",
7107	CDecl->getNameAsString());
7108
7109	// Data for initializing _class_ro_t meta-data
7110	flags = CLS;
7111	if (classIsHidden)
7112	flags \|= OBJC2_CLS_HIDDEN;
7113
7114	if (hasObjCExceptionAttribute(*Context, CDecl))
7115	flags \|= CLS_EXCEPTION;
7116
7117	if (!CDecl->getSuperClass())
7118	// class is root
7119	flags \|= CLS_ROOT;
7120
7121	InstanceSize.clear();
7122	InstanceStart.clear();
7123	if (!ObjCSynthesizedStructs.count(CDecl)) {
7124	InstanceSize = "0";
7125	InstanceStart = "0";
7126	}
7127	else {
7128	InstanceSize = "sizeof(struct ";
7129	InstanceSize += CDecl->getNameAsString();
7130	InstanceSize += "_IMPL)";
7131
7132	ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7133	if (IVD) {
7134	RewriteIvarOffsetComputation(IVD, InstanceStart);
7135	}
7136	else
7137	InstanceStart = InstanceSize;
7138	}
7139	Write__class_ro_t_initializer(Context, Result, flags,
7140	InstanceStart, InstanceSize,
7141	InstanceMethods,
7142	RefedProtocols,
7143	IVars,
7144	ClassProperties,
7145	"_OBJC_CLASS_RO_$_",
7146	CDecl->getNameAsString());
7147
7148	Write_class_t(Context, Result,
7149	"OBJC_METACLASS_$_",
7150	CDecl, /metaclass/true);
7151
7152	Write_class_t(Context, Result,
7153	"OBJC_CLASS_$_",
7154	CDecl, /metaclass/false);
7155
7156	if (ImplementationIsNonLazy(IDecl))
7157	DefinedNonLazyClasses.push_back(CDecl);
7158	}
7159
7160	void RewriteModernObjC::RewriteClassSetupInitHook(std::string &Result) {
7161	int ClsDefCount = ClassImplementation.size();
7162	if (!ClsDefCount)
7163	return;
7164	Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7165	Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7166	Result += "static void *OBJC_CLASS_SETUP[] = {\n";
7167	for (int i = 0; i < ClsDefCount; i++) {
7168	ObjCImplementationDecl *IDecl = ClassImplementation[i];
7169	ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7170	Result += "\t(void *)&OBJC_CLASS_SETUP_$_";
7171	Result += CDecl->getName(); Result += ",\n";
7172	}
7173	Result += "};\n";
7174	}
7175
7176	void RewriteModernObjC::RewriteMetaDataIntoBuffer(std::string &Result) {
7177	int ClsDefCount = ClassImplementation.size();
7178	int CatDefCount = CategoryImplementation.size();
7179
7180	// For each implemented class, write out all its meta data.
7181	for (int i = 0; i < ClsDefCount; i++)
7182	RewriteObjCClassMetaData(ClassImplementation[i], Result);
7183
7184	RewriteClassSetupInitHook(Result);
7185
7186	// For each implemented category, write out all its meta data.
7187	for (int i = 0; i < CatDefCount; i++)
7188	RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
7189
7190	RewriteCategorySetupInitHook(Result);
7191
7192	if (ClsDefCount > 0) {
7193	if (LangOpts.MicrosoftExt)
7194	Result += "__declspec(allocate(\".objc_classlist$B\")) ";
7195	Result += "static struct _class_t *L_OBJC_LABEL_CLASS_$ [";
7196	Result += llvm::utostr(ClsDefCount); Result += "]";
7197	Result +=
7198	" __attribute__((used, section (\"__DATA, __objc_classlist,"
7199	"regular,no_dead_strip\")))= {\n";
7200	for (int i = 0; i < ClsDefCount; i++) {
7201	Result += "\t&OBJC_CLASS_$_";
7202	Result += ClassImplementation[i]->getNameAsString();
7203	Result += ",\n";
7204	}
7205	Result += "};\n";
7206
7207	if (!DefinedNonLazyClasses.empty()) {
7208	if (LangOpts.MicrosoftExt)
7209	Result += "__declspec(allocate(\".objc_nlclslist$B\")) \n";
7210	Result += "static struct _class_t *_OBJC_LABEL_NONLAZY_CLASS_$[] = {\n\t";
7211	for (unsigned i = 0, e = DefinedNonLazyClasses.size(); i < e; i++) {
7212	Result += "\t&OBJC_CLASS_$_"; Result += DefinedNonLazyClasses[i]->getNameAsString();
7213	Result += ",\n";
7214	}
7215	Result += "};\n";
7216	}
7217	}
7218
7219	if (CatDefCount > 0) {
7220	if (LangOpts.MicrosoftExt)
7221	Result += "__declspec(allocate(\".objc_catlist$B\")) ";
7222	Result += "static struct _category_t *L_OBJC_LABEL_CATEGORY_$ [";
7223	Result += llvm::utostr(CatDefCount); Result += "]";
7224	Result +=
7225	" __attribute__((used, section (\"__DATA, __objc_catlist,"
7226	"regular,no_dead_strip\")))= {\n";
7227	for (int i = 0; i < CatDefCount; i++) {
7228	Result += "\t&_OBJC_$_CATEGORY_";
7229	Result +=
7230	CategoryImplementation[i]->getClassInterface()->getNameAsString();
7231	Result += "_$_";
7232	Result += CategoryImplementation[i]->getNameAsString();
7233	Result += ",\n";
7234	}
7235	Result += "};\n";
7236	}
7237
7238	if (!DefinedNonLazyCategories.empty()) {
7239	if (LangOpts.MicrosoftExt)
7240	Result += "__declspec(allocate(\".objc_nlcatlist$B\")) \n";
7241	Result += "static struct _category_t *_OBJC_LABEL_NONLAZY_CATEGORY_$[] = {\n\t";
7242	for (unsigned i = 0, e = DefinedNonLazyCategories.size(); i < e; i++) {
7243	Result += "\t&_OBJC_$_CATEGORY_";
7244	Result +=
7245	DefinedNonLazyCategories[i]->getClassInterface()->getNameAsString();
7246	Result += "_$_";
7247	Result += DefinedNonLazyCategories[i]->getNameAsString();
7248	Result += ",\n";
7249	}
7250	Result += "};\n";
7251	}
7252	}
7253
7254	void RewriteModernObjC::WriteImageInfo(std::string &Result) {
7255	if (LangOpts.MicrosoftExt)
7256	Result += "__declspec(allocate(\".objc_imageinfo$B\")) \n";
7257
7258	Result += "static struct IMAGE_INFO { unsigned version; unsigned flag; } ";
7259	// version 0, ObjCABI is 2
7260	Result += "_OBJC_IMAGE_INFO = { 0, 2 };\n";
7261	}
7262
7263	/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
7264	/// implementation.
7265	void RewriteModernObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
7266	std::string &Result) {
7267	WriteModernMetadataDeclarations(Context, Result);
7268	ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7269	// Find category declaration for this implementation.
7270	ObjCCategoryDecl *CDecl
7271	= ClassDecl->FindCategoryDeclaration(IDecl->getIdentifier());
7272
7273	std::string FullCategoryName = ClassDecl->getNameAsString();
7274	FullCategoryName += "_$_";
7275	FullCategoryName += CDecl->getNameAsString();
7276
7277	// Build _objc_method_list for class's instance methods if needed
7278	SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7279
7280	// If any of our property implementations have associated getters or
7281	// setters, produce metadata for them as well.
7282	for (const auto *Prop : IDecl->property_impls()) {
7283	if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7284	continue;
7285	if (!Prop->getPropertyIvarDecl())
7286	continue;
7287	ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7288	if (!PD)
7289	continue;
7290	if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
7291	InstanceMethods.push_back(Getter);
7292	if (PD->isReadOnly())
7293	continue;
7294	if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
7295	InstanceMethods.push_back(Setter);
7296	}
7297
7298	Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
7299	"_OBJC_$_CATEGORY_INSTANCE_METHODS_",
7300	FullCategoryName, true);
7301
7302	SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7303
7304	Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
7305	"_OBJC_$_CATEGORY_CLASS_METHODS_",
7306	FullCategoryName, true);
7307
7308	// Protocols referenced in class declaration?
7309	// Protocol's super protocol list
7310	SmallVector<ObjCProtocolDecl *, 8> RefedProtocols(CDecl->protocols());
7311	for (auto *I : CDecl->protocols())
7312	// Must write out all protocol definitions in current qualifier list,
7313	// and in their nested qualifiers before writing out current definition.
7314	RewriteObjCProtocolMetaData(I, Result);
7315
7316	Write_protocol_list_initializer(Context, Result,
7317	RefedProtocols,
7318	"_OBJC_CATEGORY_PROTOCOLS_$_",
7319	FullCategoryName);
7320
7321	// Protocol's property metadata.
7322	SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
7323	CDecl->instance_properties());
7324	Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7325	/* Container */IDecl,
7326	"_OBJC_$_PROP_LIST_",
7327	FullCategoryName);
7328
7329	Write_category_t(*this, Context, Result,
7330	CDecl,
7331	ClassDecl,
7332	InstanceMethods,
7333	ClassMethods,
7334	RefedProtocols,
7335	ClassProperties);
7336
7337	// Determine if this category is also "non-lazy".
7338	if (ImplementationIsNonLazy(IDecl))
7339	DefinedNonLazyCategories.push_back(CDecl);
7340	}
7341
7342	void RewriteModernObjC::RewriteCategorySetupInitHook(std::string &Result) {
7343	int CatDefCount = CategoryImplementation.size();
7344	if (!CatDefCount)
7345	return;
7346	Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7347	Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7348	Result += "static void *OBJC_CATEGORY_SETUP[] = {\n";
7349	for (int i = 0; i < CatDefCount; i++) {
7350	ObjCCategoryImplDecl *IDecl = CategoryImplementation[i];
7351	ObjCCategoryDecl *CatDecl= IDecl->getCategoryDecl();
7352	ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7353	Result += "\t(void *)&OBJC_CATEGORY_SETUP_$_";
7354	Result += ClassDecl->getName();
7355	Result += "_$_";
7356	Result += CatDecl->getName();
7357	Result += ",\n";
7358	}
7359	Result += "};\n";
7360	}
7361
7362	// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
7363	/// class methods.
7364	template<typename MethodIterator>
7365	void RewriteModernObjC::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
7366	MethodIterator MethodEnd,
7367	bool IsInstanceMethod,
7368	StringRef prefix,
7369	StringRef ClassName,
7370	std::string &Result) {
7371	if (MethodBegin == MethodEnd) return;
7372
7373	if (!objc_impl_method) {
7374	/* struct _objc_method {
7375	SEL _cmd;
7376	char *method_types;
7377	void *_imp;
7378	}
7379	*/
7380	Result += "\nstruct _objc_method {\n";
7381	Result += "\tSEL _cmd;\n";
7382	Result += "\tchar *method_types;\n";
7383	Result += "\tvoid *_imp;\n";
7384	Result += "};\n";
7385
7386	objc_impl_method = true;
7387	}
7388
7389	// Build _objc_method_list for class's methods if needed
7390
7391	/* struct {
7392	struct _objc_method_list *next_method;
7393	int method_count;
7394	struct _objc_method method_list[];
7395	}
7396	*/
7397	unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
7398	Result += "\n";
7399	if (LangOpts.MicrosoftExt) {
7400	if (IsInstanceMethod)
7401	Result += "__declspec(allocate(\".inst_meth$B\")) ";
7402	else
7403	Result += "__declspec(allocate(\".cls_meth$B\")) ";
7404	}
7405	Result += "static struct {\n";
7406	Result += "\tstruct _objc_method_list *next_method;\n";
7407	Result += "\tint method_count;\n";
7408	Result += "\tstruct _objc_method method_list[";
7409	Result += utostr(NumMethods);
7410	Result += "];\n} _OBJC_";
7411	Result += prefix;
7412	Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
7413	Result += "_METHODS_";
7414	Result += ClassName;
7415	Result += " __attribute__ ((used, section (\"__OBJC, __";
7416	Result += IsInstanceMethod ? "inst" : "cls";
7417	Result += "_meth\")))= ";
7418	Result += "{\n\t0, " + utostr(NumMethods) + "\n";
7419
7420	Result += "\t,{{(SEL)\"";
7421	Result += (*MethodBegin)->getSelector().getAsString().c_str();
7422	std::string MethodTypeString;
7423	Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
7424	Result += "\", \"";
7425	Result += MethodTypeString;
7426	Result += "\", (void *)";
7427	Result += MethodInternalNames[*MethodBegin];
7428	Result += "}\n";
7429	for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
7430	Result += "\t ,{(SEL)\"";
7431	Result += (*MethodBegin)->getSelector().getAsString().c_str();
7432	std::string MethodTypeString;
7433	Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
7434	Result += "\", \"";
7435	Result += MethodTypeString;
7436	Result += "\", (void *)";
7437	Result += MethodInternalNames[*MethodBegin];
7438	Result += "}\n";
7439	}
7440	Result += "\t }\n};\n";
7441	}
7442
7443	Stmt RewriteModernObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr IV) {
7444	SourceRange OldRange = IV->getSourceRange();
7445	Expr *BaseExpr = IV->getBase();
7446
7447	// Rewrite the base, but without actually doing replaces.
7448	{
7449	DisableReplaceStmtScope S(*this);
7450	BaseExpr = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
7451	IV->setBase(BaseExpr);
7452	}
7453
7454	ObjCIvarDecl *D = IV->getDecl();
7455
7456	Expr *Replacement = IV;
7457
7458	if (BaseExpr->getType()->isObjCObjectPointerType()) {
7459	const ObjCInterfaceType *iFaceDecl =
7460	dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
7461	assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
7462	// lookup which class implements the instance variable.
7463	ObjCInterfaceDecl *clsDeclared = nullptr;
7464	iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
7465	clsDeclared);
7466	assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
7467
7468	// Build name of symbol holding ivar offset.
7469	std::string IvarOffsetName;
7470	if (D->isBitField())
7471	ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
7472	else
7473	WriteInternalIvarName(clsDeclared, D, IvarOffsetName);
7474
7475	ReferencedIvars[clsDeclared].insert(D);
7476
7477	// cast offset to "char *".
7478	CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context,
7479	Context->getPointerType(Context->CharTy),
7480	CK_BitCast,
7481	BaseExpr);
7482	VarDecl NewVD = VarDecl::Create(Context, TUDecl, SourceLocation(),
7483	SourceLocation(), &Context->Idents.get(IvarOffsetName),
7484	Context->UnsignedLongTy, nullptr,
7485	SC_Extern);
7486	DeclRefExpr *DRE = new (Context)
7487	DeclRefExpr(*Context, NewVD, false, Context->UnsignedLongTy,
7488	VK_LValue, SourceLocation());
7489	BinaryOperator *addExpr =
7490	new (Context) BinaryOperator(castExpr, DRE, BO_Add,
7491	Context->getPointerType(Context->CharTy),
7492	VK_RValue, OK_Ordinary, SourceLocation(), FPOptions());
7493	// Don't forget the parens to enforce the proper binding.
7494	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(),
7495	SourceLocation(),
7496	addExpr);
7497	QualType IvarT = D->getType();
7498	if (D->isBitField())
7499	IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
7500
7501	if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
7502	RecordDecl *RD = IvarT->getAs<RecordType>()->getDecl();
7503	RD = RD->getDefinition();
7504	if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
7505	// decltype(((Foo_IMPL)0)->bar)
7506	ObjCContainerDecl *CDecl =
7507	dyn_cast<ObjCContainerDecl>(D->getDeclContext());
7508	// ivar in class extensions requires special treatment.
7509	if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
7510	CDecl = CatDecl->getClassInterface();
7511	std::string RecName = CDecl->getName();
7512	RecName += "_IMPL";
7513	RecordDecl *RD = RecordDecl::Create(
7514	*Context, TTK_Struct, TUDecl, SourceLocation(), SourceLocation(),
7515	&Context->Idents.get(RecName));
7516	QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
7517	unsigned UnsignedIntSize =
7518	static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
7519	Expr Zero = IntegerLiteral::Create(Context,
7520	llvm::APInt(UnsignedIntSize, 0),
7521	Context->UnsignedIntTy, SourceLocation());
7522	Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
7523	ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
7524	Zero);
7525	FieldDecl FD = FieldDecl::Create(Context, nullptr, SourceLocation(),
7526	SourceLocation(),
7527	&Context->Idents.get(D->getNameAsString()),
7528	IvarT, nullptr,
7529	/BitWidth=/nullptr,
7530	/Mutable=/true, ICIS_NoInit);
7531	MemberExpr *ME = new (Context)
7532	MemberExpr(PE, true, SourceLocation(), FD, SourceLocation(),
7533	FD->getType(), VK_LValue, OK_Ordinary);
7534	IvarT = Context->getDecltypeType(ME, ME->getType());
7535	}
7536	}
7537	convertObjCTypeToCStyleType(IvarT);
7538	QualType castT = Context->getPointerType(IvarT);
7539
7540	castExpr = NoTypeInfoCStyleCastExpr(Context,
7541	castT,
7542	CK_BitCast,
7543	PE);
7544
7545
7546	Expr *Exp = new (Context) UnaryOperator(castExpr, UO_Deref, IvarT,
7547	VK_LValue, OK_Ordinary,
7548	SourceLocation(), false);
7549	PE = new (Context) ParenExpr(OldRange.getBegin(),
7550	OldRange.getEnd(),
7551	Exp);
7552
7553	if (D->isBitField()) {
7554	FieldDecl FD = FieldDecl::Create(Context, nullptr, SourceLocation(),
7555	SourceLocation(),
7556	&Context->Idents.get(D->getNameAsString()),
7557	D->getType(), nullptr,
7558	/BitWidth=/D->getBitWidth(),
7559	/Mutable=/true, ICIS_NoInit);
7560	MemberExpr *ME = new (Context)
7561	MemberExpr(PE, /isArrow/ false, SourceLocation(), FD,
7562	SourceLocation(), FD->getType(), VK_LValue, OK_Ordinary);
7563	Replacement = ME;
7564
7565	}
7566	else
7567	Replacement = PE;
7568	}
7569
7570	ReplaceStmtWithRange(IV, Replacement, OldRange);
7571	return Replacement;
7572	}
7573
7574	#endif // CLANG_ENABLE_OBJC_REWRITER
7575

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