Bug Summary

File:clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp
Warning:line 1348, column 16
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name RewriteModernObjC.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/Frontend/Rewrite -resource-dir /usr/lib/llvm-14/lib/clang/14.0.0 -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/Frontend/Rewrite -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/lib/Frontend/Rewrite -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/include -I /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/llvm/include -D NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-14/lib/clang/14.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/build-llvm/tools/clang/lib/Frontend/Rewrite -fdebug-prefix-map=/build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-09-04-040900-46481-1 -x c++ /build/llvm-toolchain-snapshot-14~++20210903100615+fd66b44ec19e/clang/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_REWRITER1
34
35using namespace clang;
36using llvm::utostr;
37
38namespace {
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")(static_cast<void> (0));
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 auto *BPT = T->castAs<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_PRValue, Kind, E, nullptr,
589 FPOptionsOverride(), TInfo,
590 SourceLocation(), SourceLocation());
591 }
592
593 bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
594 IdentifierInfo* II = &Context->Idents.get("load");
595 Selector LoadSel = Context->Selectors.getSelector(0, &II);
596 return OD->getClassMethod(LoadSel) != nullptr;
597 }
598
599 StringLiteral *getStringLiteral(StringRef Str) {
600 QualType StrType = Context->getConstantArrayType(
601 Context->CharTy, llvm::APInt(32, Str.size() + 1), nullptr,
602 ArrayType::Normal, 0);
603 return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
604 /*Pascal=*/false, StrType, SourceLocation());
605 }
606 };
607} // end anonymous namespace
608
609void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
610 NamedDecl *D) {
611 if (const FunctionProtoType *fproto
612 = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
613 for (const auto &I : fproto->param_types())
614 if (isTopLevelBlockPointerType(I)) {
615 // All the args are checked/rewritten. Don't call twice!
616 RewriteBlockPointerDecl(D);
617 break;
618 }
619 }
620}
621
622void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
623 const PointerType *PT = funcType->getAs<PointerType>();
624 if (PT && PointerTypeTakesAnyBlockArguments(funcType))
625 RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
626}
627
628static bool IsHeaderFile(const std::string &Filename) {
629 std::string::size_type DotPos = Filename.rfind('.');
630
631 if (DotPos == std::string::npos) {
632 // no file extension
633 return false;
634 }
635
636 std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
637 // C header: .h
638 // C++ header: .hh or .H;
639 return Ext == "h" || Ext == "hh" || Ext == "H";
640}
641
642RewriteModernObjC::RewriteModernObjC(std::string inFile,
643 std::unique_ptr<raw_ostream> OS,
644 DiagnosticsEngine &D,
645 const LangOptions &LOpts,
646 bool silenceMacroWarn, bool LineInfo)
647 : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
648 SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
649 IsHeader = IsHeaderFile(inFile);
650 RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
651 "rewriting sub-expression within a macro (may not be correct)");
652 // FIXME. This should be an error. But if block is not called, it is OK. And it
653 // may break including some headers.
654 GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
655 "rewriting block literal declared in global scope is not implemented");
656
657 TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
658 DiagnosticsEngine::Warning,
659 "rewriter doesn't support user-specified control flow semantics "
660 "for @try/@finally (code may not execute properly)");
661}
662
663std::unique_ptr<ASTConsumer> clang::CreateModernObjCRewriter(
664 const std::string &InFile, std::unique_ptr<raw_ostream> OS,
665 DiagnosticsEngine &Diags, const LangOptions &LOpts,
666 bool SilenceRewriteMacroWarning, bool LineInfo) {
667 return std::make_unique<RewriteModernObjC>(InFile, std::move(OS), Diags,
668 LOpts, SilenceRewriteMacroWarning,
669 LineInfo);
670}
671
672void RewriteModernObjC::InitializeCommon(ASTContext &context) {
673 Context = &context;
674 SM = &Context->getSourceManager();
675 TUDecl = Context->getTranslationUnitDecl();
676 MsgSendFunctionDecl = nullptr;
677 MsgSendSuperFunctionDecl = nullptr;
678 MsgSendStretFunctionDecl = nullptr;
679 MsgSendSuperStretFunctionDecl = nullptr;
680 MsgSendFpretFunctionDecl = nullptr;
681 GetClassFunctionDecl = nullptr;
682 GetMetaClassFunctionDecl = nullptr;
683 GetSuperClassFunctionDecl = nullptr;
684 SelGetUidFunctionDecl = nullptr;
685 CFStringFunctionDecl = nullptr;
686 ConstantStringClassReference = nullptr;
687 NSStringRecord = nullptr;
688 CurMethodDef = nullptr;
689 CurFunctionDef = nullptr;
690 GlobalVarDecl = nullptr;
691 GlobalConstructionExp = nullptr;
692 SuperStructDecl = nullptr;
693 ProtocolTypeDecl = nullptr;
694 ConstantStringDecl = nullptr;
695 BcLabelCount = 0;
696 SuperConstructorFunctionDecl = nullptr;
697 NumObjCStringLiterals = 0;
698 PropParentMap = nullptr;
699 CurrentBody = nullptr;
700 DisableReplaceStmt = false;
701 objc_impl_method = false;
702
703 // Get the ID and start/end of the main file.
704 MainFileID = SM->getMainFileID();
705 llvm::MemoryBufferRef MainBuf = SM->getBufferOrFake(MainFileID);
706 MainFileStart = MainBuf.getBufferStart();
707 MainFileEnd = MainBuf.getBufferEnd();
708
709 Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
710}
711
712//===----------------------------------------------------------------------===//
713// Top Level Driver Code
714//===----------------------------------------------------------------------===//
715
716void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
717 if (Diags.hasErrorOccurred())
718 return;
719
720 // Two cases: either the decl could be in the main file, or it could be in a
721 // #included file. If the former, rewrite it now. If the later, check to see
722 // if we rewrote the #include/#import.
723 SourceLocation Loc = D->getLocation();
724 Loc = SM->getExpansionLoc(Loc);
725
726 // If this is for a builtin, ignore it.
727 if (Loc.isInvalid()) return;
728
729 // Look for built-in declarations that we need to refer during the rewrite.
730 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
731 RewriteFunctionDecl(FD);
732 } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
733 // declared in <Foundation/NSString.h>
734 if (FVD->getName() == "_NSConstantStringClassReference") {
735 ConstantStringClassReference = FVD;
736 return;
737 }
738 } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
739 RewriteCategoryDecl(CD);
740 } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
741 if (PD->isThisDeclarationADefinition())
742 RewriteProtocolDecl(PD);
743 } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
744 // Recurse into linkage specifications
745 for (DeclContext::decl_iterator DI = LSD->decls_begin(),
746 DIEnd = LSD->decls_end();
747 DI != DIEnd; ) {
748 if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
749 if (!IFace->isThisDeclarationADefinition()) {
750 SmallVector<Decl *, 8> DG;
751 SourceLocation StartLoc = IFace->getBeginLoc();
752 do {
753 if (isa<ObjCInterfaceDecl>(*DI) &&
754 !cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
755 StartLoc == (*DI)->getBeginLoc())
756 DG.push_back(*DI);
757 else
758 break;
759
760 ++DI;
761 } while (DI != DIEnd);
762 RewriteForwardClassDecl(DG);
763 continue;
764 }
765 else {
766 // Keep track of all interface declarations seen.
767 ObjCInterfacesSeen.push_back(IFace);
768 ++DI;
769 continue;
770 }
771 }
772
773 if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
774 if (!Proto->isThisDeclarationADefinition()) {
775 SmallVector<Decl *, 8> DG;
776 SourceLocation StartLoc = Proto->getBeginLoc();
777 do {
778 if (isa<ObjCProtocolDecl>(*DI) &&
779 !cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
780 StartLoc == (*DI)->getBeginLoc())
781 DG.push_back(*DI);
782 else
783 break;
784
785 ++DI;
786 } while (DI != DIEnd);
787 RewriteForwardProtocolDecl(DG);
788 continue;
789 }
790 }
791
792 HandleTopLevelSingleDecl(*DI);
793 ++DI;
794 }
795 }
796 // If we have a decl in the main file, see if we should rewrite it.
797 if (SM->isWrittenInMainFile(Loc))
798 return HandleDeclInMainFile(D);
799}
800
801//===----------------------------------------------------------------------===//
802// Syntactic (non-AST) Rewriting Code
803//===----------------------------------------------------------------------===//
804
805void RewriteModernObjC::RewriteInclude() {
806 SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
807 StringRef MainBuf = SM->getBufferData(MainFileID);
808 const char *MainBufStart = MainBuf.begin();
809 const char *MainBufEnd = MainBuf.end();
810 size_t ImportLen = strlen("import");
811
812 // Loop over the whole file, looking for includes.
813 for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
814 if (*BufPtr == '#') {
815 if (++BufPtr == MainBufEnd)
816 return;
817 while (*BufPtr == ' ' || *BufPtr == '\t')
818 if (++BufPtr == MainBufEnd)
819 return;
820 if (!strncmp(BufPtr, "import", ImportLen)) {
821 // replace import with include
822 SourceLocation ImportLoc =
823 LocStart.getLocWithOffset(BufPtr-MainBufStart);
824 ReplaceText(ImportLoc, ImportLen, "include");
825 BufPtr += ImportLen;
826 }
827 }
828 }
829}
830
831static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
832 ObjCIvarDecl *IvarDecl, std::string &Result) {
833 Result += "OBJC_IVAR_$_";
834 Result += IDecl->getName();
835 Result += "$";
836 Result += IvarDecl->getName();
837}
838
839std::string
840RewriteModernObjC::getIvarAccessString(ObjCIvarDecl *D) {
841 const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
842
843 // Build name of symbol holding ivar offset.
844 std::string IvarOffsetName;
845 if (D->isBitField())
846 ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
847 else
848 WriteInternalIvarName(ClassDecl, D, IvarOffsetName);
849
850 std::string S = "(*(";
851 QualType IvarT = D->getType();
852 if (D->isBitField())
853 IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
854
855 if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
856 RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
857 RD = RD->getDefinition();
858 if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
859 // decltype(((Foo_IMPL*)0)->bar) *
860 auto *CDecl = 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 = std::string(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 = MemberExpr::CreateImplicit(
885 *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
886 IvarT = Context->getDecltypeType(ME, ME->getType());
887 }
888 }
889 convertObjCTypeToCStyleType(IvarT);
890 QualType castT = Context->getPointerType(IvarT);
891 std::string TypeString(castT.getAsString(Context->getPrintingPolicy()));
892 S += TypeString;
893 S += ")";
894
895 // ((char *)self + IVAR_OFFSET_SYMBOL_NAME)
896 S += "((char *)self + ";
897 S += IvarOffsetName;
898 S += "))";
899 if (D->isBitField()) {
900 S += ".";
901 S += D->getNameAsString();
902 }
903 ReferencedIvars[const_cast<ObjCInterfaceDecl *>(ClassDecl)].insert(D);
904 return S;
905}
906
907/// mustSynthesizeSetterGetterMethod - returns true if setter or getter has not
908/// been found in the class implementation. In this case, it must be synthesized.
909static bool mustSynthesizeSetterGetterMethod(ObjCImplementationDecl *IMP,
910 ObjCPropertyDecl *PD,
911 bool getter) {
912 auto *OMD = IMP->getInstanceMethod(getter ? PD->getGetterName()
913 : PD->getSetterName());
914 return !OMD || OMD->isSynthesizedAccessorStub();
915}
916
917void RewriteModernObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
918 ObjCImplementationDecl *IMD,
919 ObjCCategoryImplDecl *CID) {
920 static bool objcGetPropertyDefined = false;
921 static bool objcSetPropertyDefined = false;
922 SourceLocation startGetterSetterLoc;
923
924 if (PID->getBeginLoc().isValid()) {
925 SourceLocation startLoc = PID->getBeginLoc();
926 InsertText(startLoc, "// ");
927 const char *startBuf = SM->getCharacterData(startLoc);
928 assert((*startBuf == '@') && "bogus @synthesize location")(static_cast<void> (0));
929 const char *semiBuf = strchr(startBuf, ';');
930 assert((*semiBuf == ';') && "@synthesize: can't find ';'")(static_cast<void> (0));
931 startGetterSetterLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
932 } else
933 startGetterSetterLoc = IMD ? IMD->getEndLoc() : CID->getEndLoc();
934
935 if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
936 return; // FIXME: is this correct?
937
938 // Generate the 'getter' function.
939 ObjCPropertyDecl *PD = PID->getPropertyDecl();
940 ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
941 assert(IMD && OID && "Synthesized ivars must be attached to @implementation")(static_cast<void> (0));
942
943 unsigned Attributes = PD->getPropertyAttributes();
944 if (mustSynthesizeSetterGetterMethod(IMD, PD, true /*getter*/)) {
945 bool GenGetProperty =
946 !(Attributes & ObjCPropertyAttribute::kind_nonatomic) &&
947 (Attributes & (ObjCPropertyAttribute::kind_retain |
948 ObjCPropertyAttribute::kind_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 PID->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(PID->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 & (ObjCPropertyAttribute::kind_retain |
1008 ObjCPropertyAttribute::kind_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 PID->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 & ObjCPropertyAttribute::kind_nonatomic)
1028 Setr += "0, ";
1029 else
1030 Setr += "1, ";
1031 if (Attributes & ObjCPropertyAttribute::kind_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
1044static 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
1060void 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
1069void 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
1090void 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
1105void 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
1122void 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
1129void 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
1154void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
1155 SourceLocation LocStart = PDecl->getBeginLoc();
1156 assert(PDecl->isThisDeclarationADefinition())(static_cast<void> (0));
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
1189void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
1190 SourceLocation LocStart = (*D.begin())->getBeginLoc();
1191 if (LocStart.isInvalid())
1192 llvm_unreachable("Invalid SourceLocation")__builtin_unreachable();
1193 // FIXME: handle forward protocol that are declared across multiple lines.
1194 ReplaceText(LocStart, 0, "// ");
1195}
1196
1197void
1198RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
1199 SourceLocation LocStart = DG[0]->getBeginLoc();
1200 if (LocStart.isInvalid())
1201 llvm_unreachable("Invalid SourceLocation")__builtin_unreachable();
1202 // FIXME: handle forward protocol that are declared across multiple lines.
1203 ReplaceText(LocStart, 0, "// ");
1204}
1205
1206void 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
1229void 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
1333void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
1334 ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
14
Assuming 'OID' is not a 'ObjCImplementationDecl'
1335 ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
15
Assuming 'OID' is not a 'ObjCCategoryImplDecl'
16
'CID' initialized to a null pointer value
1336 assert((IMD || CID) && "Unknown implementation type")(static_cast<void> (0));
1337
1338 if (IMD
16.1
'IMD' is null
) {
17
Taking false branch
1339 if (IMD->getIvarRBraceLoc().isValid()) {
1340 ReplaceText(IMD->getBeginLoc(), 1, "/** ");
1341 ReplaceText(IMD->getIvarRBraceLoc(), 1, "**/ ");
1342 }
1343 else {
1344 InsertText(IMD->getBeginLoc(), "// ");
1345 }
1346 }
1347 else
1348 InsertText(CID->getBeginLoc(), "// ");
18
Called C++ object pointer is null
1349
1350 for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
1351 if (!OMD->getBody())
1352 continue;
1353 std::string ResultStr;
1354 RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1355 SourceLocation LocStart = OMD->getBeginLoc();
1356 SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1357
1358 const char *startBuf = SM->getCharacterData(LocStart);
1359 const char *endBuf = SM->getCharacterData(LocEnd);
1360 ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1361 }
1362
1363 for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
1364 if (!OMD->getBody())
1365 continue;
1366 std::string ResultStr;
1367 RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1368 SourceLocation LocStart = OMD->getBeginLoc();
1369 SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1370
1371 const char *startBuf = SM->getCharacterData(LocStart);
1372 const char *endBuf = SM->getCharacterData(LocEnd);
1373 ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1374 }
1375 for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
1376 RewritePropertyImplDecl(I, IMD, CID);
1377
1378 InsertText(IMD ? IMD->getEndLoc() : CID->getEndLoc(), "// ");
1379}
1380
1381void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
1382 // Do not synthesize more than once.
1383 if (ObjCSynthesizedStructs.count(ClassDecl))
1384 return;
1385 // Make sure super class's are written before current class is written.
1386 ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
1387 while (SuperClass) {
1388 RewriteInterfaceDecl(SuperClass);
1389 SuperClass = SuperClass->getSuperClass();
1390 }
1391 std::string ResultStr;
1392 if (!ObjCWrittenInterfaces.count(ClassDecl->getCanonicalDecl())) {
1393 // we haven't seen a forward decl - generate a typedef.
1394 RewriteOneForwardClassDecl(ClassDecl, ResultStr);
1395 RewriteIvarOffsetSymbols(ClassDecl, ResultStr);
1396
1397 RewriteObjCInternalStruct(ClassDecl, ResultStr);
1398 // Mark this typedef as having been written into its c++ equivalent.
1399 ObjCWrittenInterfaces.insert(ClassDecl->getCanonicalDecl());
1400
1401 for (auto *I : ClassDecl->instance_properties())
1402 RewriteProperty(I);
1403 for (auto *I : ClassDecl->instance_methods())
1404 RewriteMethodDeclaration(I);
1405 for (auto *I : ClassDecl->class_methods())
1406 RewriteMethodDeclaration(I);
1407
1408 // Lastly, comment out the @end.
1409 ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
1410 "/* @end */\n");
1411 }
1412}
1413
1414Stmt *RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
1415 SourceRange OldRange = PseudoOp->getSourceRange();
1416
1417 // We just magically know some things about the structure of this
1418 // expression.
1419 ObjCMessageExpr *OldMsg =
1420 cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
1421 PseudoOp->getNumSemanticExprs() - 1));
1422
1423 // Because the rewriter doesn't allow us to rewrite rewritten code,
1424 // we need to suppress rewriting the sub-statements.
1425 Expr *Base;
1426 SmallVector<Expr*, 2> Args;
1427 {
1428 DisableReplaceStmtScope S(*this);
1429
1430 // Rebuild the base expression if we have one.
1431 Base = nullptr;
1432 if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1433 Base = OldMsg->getInstanceReceiver();
1434 Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1435 Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1436 }
1437
1438 unsigned numArgs = OldMsg->getNumArgs();
1439 for (unsigned i = 0; i < numArgs; i++) {
1440 Expr *Arg = OldMsg->getArg(i);
1441 if (isa<OpaqueValueExpr>(Arg))
1442 Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1443 Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1444 Args.push_back(Arg);
1445 }
1446 }
1447
1448 // TODO: avoid this copy.
1449 SmallVector<SourceLocation, 1> SelLocs;
1450 OldMsg->getSelectorLocs(SelLocs);
1451
1452 ObjCMessageExpr *NewMsg = nullptr;
1453 switch (OldMsg->getReceiverKind()) {
1454 case ObjCMessageExpr::Class:
1455 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1456 OldMsg->getValueKind(),
1457 OldMsg->getLeftLoc(),
1458 OldMsg->getClassReceiverTypeInfo(),
1459 OldMsg->getSelector(),
1460 SelLocs,
1461 OldMsg->getMethodDecl(),
1462 Args,
1463 OldMsg->getRightLoc(),
1464 OldMsg->isImplicit());
1465 break;
1466
1467 case ObjCMessageExpr::Instance:
1468 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1469 OldMsg->getValueKind(),
1470 OldMsg->getLeftLoc(),
1471 Base,
1472 OldMsg->getSelector(),
1473 SelLocs,
1474 OldMsg->getMethodDecl(),
1475 Args,
1476 OldMsg->getRightLoc(),
1477 OldMsg->isImplicit());
1478 break;
1479
1480 case ObjCMessageExpr::SuperClass:
1481 case ObjCMessageExpr::SuperInstance:
1482 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1483 OldMsg->getValueKind(),
1484 OldMsg->getLeftLoc(),
1485 OldMsg->getSuperLoc(),
1486 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1487 OldMsg->getSuperType(),
1488 OldMsg->getSelector(),
1489 SelLocs,
1490 OldMsg->getMethodDecl(),
1491 Args,
1492 OldMsg->getRightLoc(),
1493 OldMsg->isImplicit());
1494 break;
1495 }
1496
1497 Stmt *Replacement = SynthMessageExpr(NewMsg);
1498 ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1499 return Replacement;
1500}
1501
1502Stmt *RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
1503 SourceRange OldRange = PseudoOp->getSourceRange();
1504
1505 // We just magically know some things about the structure of this
1506 // expression.
1507 ObjCMessageExpr *OldMsg =
1508 cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
1509
1510 // Because the rewriter doesn't allow us to rewrite rewritten code,
1511 // we need to suppress rewriting the sub-statements.
1512 Expr *Base = nullptr;
1513 SmallVector<Expr*, 1> Args;
1514 {
1515 DisableReplaceStmtScope S(*this);
1516 // Rebuild the base expression if we have one.
1517 if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1518 Base = OldMsg->getInstanceReceiver();
1519 Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1520 Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1521 }
1522 unsigned numArgs = OldMsg->getNumArgs();
1523 for (unsigned i = 0; i < numArgs; i++) {
1524 Expr *Arg = OldMsg->getArg(i);
1525 if (isa<OpaqueValueExpr>(Arg))
1526 Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1527 Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1528 Args.push_back(Arg);
1529 }
1530 }
1531
1532 // Intentionally empty.
1533 SmallVector<SourceLocation, 1> SelLocs;
1534
1535 ObjCMessageExpr *NewMsg = nullptr;
1536 switch (OldMsg->getReceiverKind()) {
1537 case ObjCMessageExpr::Class:
1538 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1539 OldMsg->getValueKind(),
1540 OldMsg->getLeftLoc(),
1541 OldMsg->getClassReceiverTypeInfo(),
1542 OldMsg->getSelector(),
1543 SelLocs,
1544 OldMsg->getMethodDecl(),
1545 Args,
1546 OldMsg->getRightLoc(),
1547 OldMsg->isImplicit());
1548 break;
1549
1550 case ObjCMessageExpr::Instance:
1551 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1552 OldMsg->getValueKind(),
1553 OldMsg->getLeftLoc(),
1554 Base,
1555 OldMsg->getSelector(),
1556 SelLocs,
1557 OldMsg->getMethodDecl(),
1558 Args,
1559 OldMsg->getRightLoc(),
1560 OldMsg->isImplicit());
1561 break;
1562
1563 case ObjCMessageExpr::SuperClass:
1564 case ObjCMessageExpr::SuperInstance:
1565 NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1566 OldMsg->getValueKind(),
1567 OldMsg->getLeftLoc(),
1568 OldMsg->getSuperLoc(),
1569 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1570 OldMsg->getSuperType(),
1571 OldMsg->getSelector(),
1572 SelLocs,
1573 OldMsg->getMethodDecl(),
1574 Args,
1575 OldMsg->getRightLoc(),
1576 OldMsg->isImplicit());
1577 break;
1578 }
1579
1580 Stmt *Replacement = SynthMessageExpr(NewMsg);
1581 ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1582 return Replacement;
1583}
1584
1585/// SynthCountByEnumWithState - To print:
1586/// ((NSUInteger (*)
1587/// (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1588/// (void *)objc_msgSend)((id)l_collection,
1589/// sel_registerName(
1590/// "countByEnumeratingWithState:objects:count:"),
1591/// &enumState,
1592/// (id *)__rw_items, (NSUInteger)16)
1593///
1594void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
1595 buf += "((_WIN_NSUInteger (*) (id, SEL, struct __objcFastEnumerationState *, "
1596 "id *, _WIN_NSUInteger))(void *)objc_msgSend)";
1597 buf += "\n\t\t";
1598 buf += "((id)l_collection,\n\t\t";
1599 buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
1600 buf += "\n\t\t";
1601 buf += "&enumState, "
1602 "(id *)__rw_items, (_WIN_NSUInteger)16)";
1603}
1604
1605/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
1606/// statement to exit to its outer synthesized loop.
1607///
1608Stmt *RewriteModernObjC::RewriteBreakStmt(BreakStmt *S) {
1609 if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1610 return S;
1611 // replace break with goto __break_label
1612 std::string buf;
1613
1614 SourceLocation startLoc = S->getBeginLoc();
1615 buf = "goto __break_label_";
1616 buf += utostr(ObjCBcLabelNo.back());
1617 ReplaceText(startLoc, strlen("break"), buf);
1618
1619 return nullptr;
1620}
1621
1622void RewriteModernObjC::ConvertSourceLocationToLineDirective(
1623 SourceLocation Loc,
1624 std::string &LineString) {
1625 if (Loc.isFileID() && GenerateLineInfo) {
1626 LineString += "\n#line ";
1627 PresumedLoc PLoc = SM->getPresumedLoc(Loc);
1628 LineString += utostr(PLoc.getLine());
1629 LineString += " \"";
1630 LineString += Lexer::Stringify(PLoc.getFilename());
1631 LineString += "\"\n";
1632 }
1633}
1634
1635/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
1636/// statement to continue with its inner synthesized loop.
1637///
1638Stmt *RewriteModernObjC::RewriteContinueStmt(ContinueStmt *S) {
1639 if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1640 return S;
1641 // replace continue with goto __continue_label
1642 std::string buf;
1643
1644 SourceLocation startLoc = S->getBeginLoc();
1645 buf = "goto __continue_label_";
1646 buf += utostr(ObjCBcLabelNo.back());
1647 ReplaceText(startLoc, strlen("continue"), buf);
1648
1649 return nullptr;
1650}
1651
1652/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
1653/// It rewrites:
1654/// for ( type elem in collection) { stmts; }
1655
1656/// Into:
1657/// {
1658/// type elem;
1659/// struct __objcFastEnumerationState enumState = { 0 };
1660/// id __rw_items[16];
1661/// id l_collection = (id)collection;
1662/// NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
1663/// objects:__rw_items count:16];
1664/// if (limit) {
1665/// unsigned long startMutations = *enumState.mutationsPtr;
1666/// do {
1667/// unsigned long counter = 0;
1668/// do {
1669/// if (startMutations != *enumState.mutationsPtr)
1670/// objc_enumerationMutation(l_collection);
1671/// elem = (type)enumState.itemsPtr[counter++];
1672/// stmts;
1673/// __continue_label: ;
1674/// } while (counter < limit);
1675/// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1676/// objects:__rw_items count:16]));
1677/// elem = nil;
1678/// __break_label: ;
1679/// }
1680/// else
1681/// elem = nil;
1682/// }
1683///
1684Stmt *RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
1685 SourceLocation OrigEnd) {
1686 assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty")(static_cast<void> (0));
1687 assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&(static_cast<void> (0))
1688 "ObjCForCollectionStmt Statement stack mismatch")(static_cast<void> (0));
1689 assert(!ObjCBcLabelNo.empty() &&(static_cast<void> (0))
1690 "ObjCForCollectionStmt - Label No stack empty")(static_cast<void> (0));
1691
1692 SourceLocation startLoc = S->getBeginLoc();
1693 const char *startBuf = SM->getCharacterData(startLoc);
1694 StringRef elementName;
1695 std::string elementTypeAsString;
1696 std::string buf;
1697 // line directive first.
1698 SourceLocation ForEachLoc = S->getForLoc();
1699 ConvertSourceLocationToLineDirective(ForEachLoc, buf);
1700 buf += "{\n\t";
1701 if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
1702 // type elem;
1703 NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
1704 QualType ElementType = cast<ValueDecl>(D)->getType();
1705 if (ElementType->isObjCQualifiedIdType() ||
1706 ElementType->isObjCQualifiedInterfaceType())
1707 // Simply use 'id' for all qualified types.
1708 elementTypeAsString = "id";
1709 else
1710 elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
1711 buf += elementTypeAsString;
1712 buf += " ";
1713 elementName = D->getName();
1714 buf += elementName;
1715 buf += ";\n\t";
1716 }
1717 else {
1718 DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
1719 elementName = DR->getDecl()->getName();
1720 ValueDecl *VD = DR->getDecl();
1721 if (VD->getType()->isObjCQualifiedIdType() ||
1722 VD->getType()->isObjCQualifiedInterfaceType())
1723 // Simply use 'id' for all qualified types.
1724 elementTypeAsString = "id";
1725 else
1726 elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
1727 }
1728
1729 // struct __objcFastEnumerationState enumState = { 0 };
1730 buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
1731 // id __rw_items[16];
1732 buf += "id __rw_items[16];\n\t";
1733 // id l_collection = (id)
1734 buf += "id l_collection = (id)";
1735 // Find start location of 'collection' the hard way!
1736 const char *startCollectionBuf = startBuf;
1737 startCollectionBuf += 3; // skip 'for'
1738 startCollectionBuf = strchr(startCollectionBuf, '(');
1739 startCollectionBuf++; // skip '('
1740 // find 'in' and skip it.
1741 while (*startCollectionBuf != ' ' ||
1742 *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
1743 (*(startCollectionBuf+3) != ' ' &&
1744 *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
1745 startCollectionBuf++;
1746 startCollectionBuf += 3;
1747
1748 // Replace: "for (type element in" with string constructed thus far.
1749 ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
1750 // Replace ')' in for '(' type elem in collection ')' with ';'
1751 SourceLocation rightParenLoc = S->getRParenLoc();
1752 const char *rparenBuf = SM->getCharacterData(rightParenLoc);
1753 SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
1754 buf = ";\n\t";
1755
1756 // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
1757 // objects:__rw_items count:16];
1758 // which is synthesized into:
1759 // NSUInteger limit =
1760 // ((NSUInteger (*)
1761 // (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1762 // (void *)objc_msgSend)((id)l_collection,
1763 // sel_registerName(
1764 // "countByEnumeratingWithState:objects:count:"),
1765 // (struct __objcFastEnumerationState *)&state,
1766 // (id *)__rw_items, (NSUInteger)16);
1767 buf += "_WIN_NSUInteger limit =\n\t\t";
1768 SynthCountByEnumWithState(buf);
1769 buf += ";\n\t";
1770 /// if (limit) {
1771 /// unsigned long startMutations = *enumState.mutationsPtr;
1772 /// do {
1773 /// unsigned long counter = 0;
1774 /// do {
1775 /// if (startMutations != *enumState.mutationsPtr)
1776 /// objc_enumerationMutation(l_collection);
1777 /// elem = (type)enumState.itemsPtr[counter++];
1778 buf += "if (limit) {\n\t";
1779 buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
1780 buf += "do {\n\t\t";
1781 buf += "unsigned long counter = 0;\n\t\t";
1782 buf += "do {\n\t\t\t";
1783 buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
1784 buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
1785 buf += elementName;
1786 buf += " = (";
1787 buf += elementTypeAsString;
1788 buf += ")enumState.itemsPtr[counter++];";
1789 // Replace ')' in for '(' type elem in collection ')' with all of these.
1790 ReplaceText(lparenLoc, 1, buf);
1791
1792 /// __continue_label: ;
1793 /// } while (counter < limit);
1794 /// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1795 /// objects:__rw_items count:16]));
1796 /// elem = nil;
1797 /// __break_label: ;
1798 /// }
1799 /// else
1800 /// elem = nil;
1801 /// }
1802 ///
1803 buf = ";\n\t";
1804 buf += "__continue_label_";
1805 buf += utostr(ObjCBcLabelNo.back());
1806 buf += ": ;";
1807 buf += "\n\t\t";
1808 buf += "} while (counter < limit);\n\t";
1809 buf += "} while ((limit = ";
1810 SynthCountByEnumWithState(buf);
1811 buf += "));\n\t";
1812 buf += elementName;
1813 buf += " = ((";
1814 buf += elementTypeAsString;
1815 buf += ")0);\n\t";
1816 buf += "__break_label_";
1817 buf += utostr(ObjCBcLabelNo.back());
1818 buf += ": ;\n\t";
1819 buf += "}\n\t";
1820 buf += "else\n\t\t";
1821 buf += elementName;
1822 buf += " = ((";
1823 buf += elementTypeAsString;
1824 buf += ")0);\n\t";
1825 buf += "}\n";
1826
1827 // Insert all these *after* the statement body.
1828 // FIXME: If this should support Obj-C++, support CXXTryStmt
1829 if (isa<CompoundStmt>(S->getBody())) {
1830 SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
1831 InsertText(endBodyLoc, buf);
1832 } else {
1833 /* Need to treat single statements specially. For example:
1834 *
1835 * for (A *a in b) if (stuff()) break;
1836 * for (A *a in b) xxxyy;
1837 *
1838 * The following code simply scans ahead to the semi to find the actual end.
1839 */
1840 const char *stmtBuf = SM->getCharacterData(OrigEnd);
1841 const char *semiBuf = strchr(stmtBuf, ';');
1842 assert(semiBuf && "Can't find ';'")(static_cast<void> (0));
1843 SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
1844 InsertText(endBodyLoc, buf);
1845 }
1846 Stmts.pop_back();
1847 ObjCBcLabelNo.pop_back();
1848 return nullptr;
1849}
1850
1851static void Write_RethrowObject(std::string &buf) {
1852 buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
1853 buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
1854 buf += "\tid rethrow;\n";
1855 buf += "\t} _fin_force_rethow(_rethrow);";
1856}
1857
1858/// RewriteObjCSynchronizedStmt -
1859/// This routine rewrites @synchronized(expr) stmt;
1860/// into:
1861/// objc_sync_enter(expr);
1862/// @try stmt @finally { objc_sync_exit(expr); }
1863///
1864Stmt *RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
1865 // Get the start location and compute the semi location.
1866 SourceLocation startLoc = S->getBeginLoc();
1867 const char *startBuf = SM->getCharacterData(startLoc);
1868
1869 assert((*startBuf == '@') && "bogus @synchronized location")(static_cast<void> (0));
1870
1871 std::string buf;
1872 SourceLocation SynchLoc = S->getAtSynchronizedLoc();
1873 ConvertSourceLocationToLineDirective(SynchLoc, buf);
1874 buf += "{ id _rethrow = 0; id _sync_obj = (id)";
1875
1876 const char *lparenBuf = startBuf;
1877 while (*lparenBuf != '(') lparenBuf++;
1878 ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
1879
1880 buf = "; objc_sync_enter(_sync_obj);\n";
1881 buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
1882 buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
1883 buf += "\n\tid sync_exit;";
1884 buf += "\n\t} _sync_exit(_sync_obj);\n";
1885
1886 // We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
1887 // the sync expression is typically a message expression that's already
1888 // been rewritten! (which implies the SourceLocation's are invalid).
1889 SourceLocation RParenExprLoc = S->getSynchBody()->getBeginLoc();
1890 const char *RParenExprLocBuf = SM->getCharacterData(RParenExprLoc);
1891 while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
1892 RParenExprLoc = startLoc.getLocWithOffset(RParenExprLocBuf-startBuf);
1893
1894 SourceLocation LBranceLoc = S->getSynchBody()->getBeginLoc();
1895 const char *LBraceLocBuf = SM->getCharacterData(LBranceLoc);
1896 assert (*LBraceLocBuf == '{')(static_cast<void> (0));
1897 ReplaceText(RParenExprLoc, (LBraceLocBuf - SM->getCharacterData(RParenExprLoc) + 1), buf);
1898
1899 SourceLocation startRBraceLoc = S->getSynchBody()->getEndLoc();
1900 assert((*SM->getCharacterData(startRBraceLoc) == '}') &&(static_cast<void> (0))
1901 "bogus @synchronized block")(static_cast<void> (0));
1902
1903 buf = "} catch (id e) {_rethrow = e;}\n";
1904 Write_RethrowObject(buf);
1905 buf += "}\n";
1906 buf += "}\n";
1907
1908 ReplaceText(startRBraceLoc, 1, buf);
1909
1910 return nullptr;
1911}
1912
1913void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
1914{
1915 // Perform a bottom up traversal of all children.
1916 for (Stmt *SubStmt : S->children())
1917 if (SubStmt)
1918 WarnAboutReturnGotoStmts(SubStmt);
1919
1920 if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
1921 Diags.Report(Context->getFullLoc(S->getBeginLoc()),
1922 TryFinallyContainsReturnDiag);
1923 }
1924}
1925
1926Stmt *RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S) {
1927 SourceLocation startLoc = S->getAtLoc();
1928 ReplaceText(startLoc, strlen("@autoreleasepool"), "/* @autoreleasepool */");
1929 ReplaceText(S->getSubStmt()->getBeginLoc(), 1,
1930 "{ __AtAutoreleasePool __autoreleasepool; ");
1931
1932 return nullptr;
1933}
1934
1935Stmt *RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
1936 ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
1937 bool noCatch = S->getNumCatchStmts() == 0;
1938 std::string buf;
1939 SourceLocation TryLocation = S->getAtTryLoc();
1940 ConvertSourceLocationToLineDirective(TryLocation, buf);
1941
1942 if (finalStmt) {
1943 if (noCatch)
1944 buf += "{ id volatile _rethrow = 0;\n";
1945 else {
1946 buf += "{ id volatile _rethrow = 0;\ntry {\n";
1947 }
1948 }
1949 // Get the start location and compute the semi location.
1950 SourceLocation startLoc = S->getBeginLoc();
1951 const char *startBuf = SM->getCharacterData(startLoc);
1952
1953 assert((*startBuf == '@') && "bogus @try location")(static_cast<void> (0));
1954 if (finalStmt)
1955 ReplaceText(startLoc, 1, buf);
1956 else
1957 // @try -> try
1958 ReplaceText(startLoc, 1, "");
1959
1960 for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
1961 ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
1962 VarDecl *catchDecl = Catch->getCatchParamDecl();
1963
1964 startLoc = Catch->getBeginLoc();
1965 bool AtRemoved = false;
1966 if (catchDecl) {
1967 QualType t = catchDecl->getType();
1968 if (const ObjCObjectPointerType *Ptr = t->getAs<ObjCObjectPointerType>()) {
1969 // Should be a pointer to a class.
1970 ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
1971 if (IDecl) {
1972 std::string Result;
1973 ConvertSourceLocationToLineDirective(Catch->getBeginLoc(), Result);
1974
1975 startBuf = SM->getCharacterData(startLoc);
1976 assert((*startBuf == '@') && "bogus @catch location")(static_cast<void> (0));
1977 SourceLocation rParenLoc = Catch->getRParenLoc();
1978 const char *rParenBuf = SM->getCharacterData(rParenLoc);
1979
1980 // _objc_exc_Foo *_e as argument to catch.
1981 Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
1982 Result += " *_"; Result += catchDecl->getNameAsString();
1983 Result += ")";
1984 ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
1985 // Foo *e = (Foo *)_e;
1986 Result.clear();
1987 Result = "{ ";
1988 Result += IDecl->getNameAsString();
1989 Result += " *"; Result += catchDecl->getNameAsString();
1990 Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
1991 Result += "_"; Result += catchDecl->getNameAsString();
1992
1993 Result += "; ";
1994 SourceLocation lBraceLoc = Catch->getCatchBody()->getBeginLoc();
1995 ReplaceText(lBraceLoc, 1, Result);
1996 AtRemoved = true;
1997 }
1998 }
1999 }
2000 if (!AtRemoved)
2001 // @catch -> catch
2002 ReplaceText(startLoc, 1, "");
2003
2004 }
2005 if (finalStmt) {
2006 buf.clear();
2007 SourceLocation FinallyLoc = finalStmt->getBeginLoc();
2008
2009 if (noCatch) {
2010 ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2011 buf += "catch (id e) {_rethrow = e;}\n";
2012 }
2013 else {
2014 buf += "}\n";
2015 ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2016 buf += "catch (id e) {_rethrow = e;}\n";
2017 }
2018
2019 SourceLocation startFinalLoc = finalStmt->getBeginLoc();
2020 ReplaceText(startFinalLoc, 8, buf);
2021 Stmt *body = finalStmt->getFinallyBody();
2022 SourceLocation startFinalBodyLoc = body->getBeginLoc();
2023 buf.clear();
2024 Write_RethrowObject(buf);
2025 ReplaceText(startFinalBodyLoc, 1, buf);
2026
2027 SourceLocation endFinalBodyLoc = body->getEndLoc();
2028 ReplaceText(endFinalBodyLoc, 1, "}\n}");
2029 // Now check for any return/continue/go statements within the @try.
2030 WarnAboutReturnGotoStmts(S->getTryBody());
2031 }
2032
2033 return nullptr;
2034}
2035
2036// This can't be done with ReplaceStmt(S, ThrowExpr), since
2037// the throw expression is typically a message expression that's already
2038// been rewritten! (which implies the SourceLocation's are invalid).
2039Stmt *RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
2040 // Get the start location and compute the semi location.
2041 SourceLocation startLoc = S->getBeginLoc();
2042 const char *startBuf = SM->getCharacterData(startLoc);
2043
2044 assert((*startBuf == '@') && "bogus @throw location")(static_cast<void> (0));
2045
2046 std::string buf;
2047 /* void objc_exception_throw(id) __attribute__((noreturn)); */
2048 if (S->getThrowExpr())
2049 buf = "objc_exception_throw(";
2050 else
2051 buf = "throw";
2052
2053 // handle "@ throw" correctly.
2054 const char *wBuf = strchr(startBuf, 'w');
2055 assert((*wBuf == 'w') && "@throw: can't find 'w'")(static_cast<void> (0));
2056 ReplaceText(startLoc, wBuf-startBuf+1, buf);
2057
2058 SourceLocation endLoc = S->getEndLoc();
2059 const char *endBuf = SM->getCharacterData(endLoc);
2060 const char *semiBuf = strchr(endBuf, ';');
2061 assert((*semiBuf == ';') && "@throw: can't find ';'")(static_cast<void> (0));
2062 SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
2063 if (S->getThrowExpr())
2064 ReplaceText(semiLoc, 1, ");");
2065 return nullptr;
2066}
2067
2068Stmt *RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
2069 // Create a new string expression.
2070 std::string StrEncoding;
2071 Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
2072 Expr *Replacement = getStringLiteral(StrEncoding);
2073 ReplaceStmt(Exp, Replacement);
2074
2075 // Replace this subexpr in the parent.
2076 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2077 return Replacement;
2078}
2079
2080Stmt *RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
2081 if (!SelGetUidFunctionDecl)
2082 SynthSelGetUidFunctionDecl();
2083 assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl")(static_cast<void> (0));
2084 // Create a call to sel_registerName("selName").
2085 SmallVector<Expr*, 8> SelExprs;
2086 SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
2087 CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2088 SelExprs);
2089 ReplaceStmt(Exp, SelExp);
2090 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2091 return SelExp;
2092}
2093
2094CallExpr *
2095RewriteModernObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
2096 ArrayRef<Expr *> Args,
2097 SourceLocation StartLoc,
2098 SourceLocation EndLoc) {
2099 // Get the type, we will need to reference it in a couple spots.
2100 QualType msgSendType = FD->getType();
2101
2102 // Create a reference to the objc_msgSend() declaration.
2103 DeclRefExpr *DRE = new (Context) DeclRefExpr(*Context, FD, false, msgSendType,
2104 VK_LValue, SourceLocation());
2105
2106 // Now, we cast the reference to a pointer to the objc_msgSend type.
2107 QualType pToFunc = Context->getPointerType(msgSendType);
2108 ImplicitCastExpr *ICE =
2109 ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
2110 DRE, nullptr, VK_PRValue, FPOptionsOverride());
2111
2112 const auto *FT = msgSendType->castAs<FunctionType>();
2113 CallExpr *Exp =
2114 CallExpr::Create(*Context, ICE, Args, FT->getCallResultType(*Context),
2115 VK_PRValue, EndLoc, FPOptionsOverride());
2116 return Exp;
2117}
2118
2119static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
2120 const char *&startRef, const char *&endRef) {
2121 while (startBuf < endBuf) {
2122 if (*startBuf == '<')
2123 startRef = startBuf; // mark the start.
2124 if (*startBuf == '>') {
2125 if (startRef && *startRef == '<') {
2126 endRef = startBuf; // mark the end.
2127 return true;
2128 }
2129 return false;
2130 }
2131 startBuf++;
2132 }
2133 return false;
2134}
2135
2136static void scanToNextArgument(const char *&argRef) {
2137 int angle = 0;
2138 while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
2139 if (*argRef == '<')
2140 angle++;
2141 else if (*argRef == '>')
2142 angle--;
2143 argRef++;
2144 }
2145 assert(angle == 0 && "scanToNextArgument - bad protocol type syntax")(static_cast<void> (0));
2146}
2147
2148bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
2149 if (T->isObjCQualifiedIdType())
2150 return true;
2151 if (const PointerType *PT = T->getAs<PointerType>()) {
2152 if (PT->getPointeeType()->isObjCQualifiedIdType())
2153 return true;
2154 }
2155 if (T->isObjCObjectPointerType()) {
2156 T = T->getPointeeType();
2157 return T->isObjCQualifiedInterfaceType();
2158 }
2159 if (T->isArrayType()) {
2160 QualType ElemTy = Context->getBaseElementType(T);
2161 return needToScanForQualifiers(ElemTy);
2162 }
2163 return false;
2164}
2165
2166void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
2167 QualType Type = E->getType();
2168 if (needToScanForQualifiers(Type)) {
2169 SourceLocation Loc, EndLoc;
2170
2171 if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
2172 Loc = ECE->getLParenLoc();
2173 EndLoc = ECE->getRParenLoc();
2174 } else {
2175 Loc = E->getBeginLoc();
2176 EndLoc = E->getEndLoc();
2177 }
2178 // This will defend against trying to rewrite synthesized expressions.
2179 if (Loc.isInvalid() || EndLoc.isInvalid())
2180 return;
2181
2182 const char *startBuf = SM->getCharacterData(Loc);
2183 const char *endBuf = SM->getCharacterData(EndLoc);
2184 const char *startRef = nullptr, *endRef = nullptr;
2185 if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2186 // Get the locations of the startRef, endRef.
2187 SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
2188 SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
2189 // Comment out the protocol references.
2190 InsertText(LessLoc, "/*");
2191 InsertText(GreaterLoc, "*/");
2192 }
2193 }
2194}
2195
2196void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
2197 SourceLocation Loc;
2198 QualType Type;
2199 const FunctionProtoType *proto = nullptr;
2200 if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
2201 Loc = VD->getLocation();
2202 Type = VD->getType();
2203 }
2204 else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
2205 Loc = FD->getLocation();
2206 // Check for ObjC 'id' and class types that have been adorned with protocol
2207 // information (id<p>, C<p>*). The protocol references need to be rewritten!
2208 const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2209 assert(funcType && "missing function type")(static_cast<void> (0));
2210 proto = dyn_cast<FunctionProtoType>(funcType);
2211 if (!proto)
2212 return;
2213 Type = proto->getReturnType();
2214 }
2215 else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
2216 Loc = FD->getLocation();
2217 Type = FD->getType();
2218 }
2219 else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Dcl)) {
2220 Loc = TD->getLocation();
2221 Type = TD->getUnderlyingType();
2222 }
2223 else
2224 return;
2225
2226 if (needToScanForQualifiers(Type)) {
2227 // Since types are unique, we need to scan the buffer.
2228
2229 const char *endBuf = SM->getCharacterData(Loc);
2230 const char *startBuf = endBuf;
2231 while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
2232 startBuf--; // scan backward (from the decl location) for return type.
2233 const char *startRef = nullptr, *endRef = nullptr;
2234 if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2235 // Get the locations of the startRef, endRef.
2236 SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
2237 SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
2238 // Comment out the protocol references.
2239 InsertText(LessLoc, "/*");
2240 InsertText(GreaterLoc, "*/");
2241 }
2242 }
2243 if (!proto)
2244 return; // most likely, was a variable
2245 // Now check arguments.
2246 const char *startBuf = SM->getCharacterData(Loc);
2247 const char *startFuncBuf = startBuf;
2248 for (unsigned i = 0; i < proto->getNumParams(); i++) {
2249 if (needToScanForQualifiers(proto->getParamType(i))) {
2250 // Since types are unique, we need to scan the buffer.
2251
2252 const char *endBuf = startBuf;
2253 // scan forward (from the decl location) for argument types.
2254 scanToNextArgument(endBuf);
2255 const char *startRef = nullptr, *endRef = nullptr;
2256 if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2257 // Get the locations of the startRef, endRef.
2258 SourceLocation LessLoc =
2259 Loc.getLocWithOffset(startRef-startFuncBuf);
2260 SourceLocation GreaterLoc =
2261 Loc.getLocWithOffset(endRef-startFuncBuf+1);
2262 // Comment out the protocol references.
2263 InsertText(LessLoc, "/*");
2264 InsertText(GreaterLoc, "*/");
2265 }
2266 startBuf = ++endBuf;
2267 }
2268 else {
2269 // If the function name is derived from a macro expansion, then the
2270 // argument buffer will not follow the name. Need to speak with Chris.
2271 while (*startBuf && *startBuf != ')' && *startBuf != ',')
2272 startBuf++; // scan forward (from the decl location) for argument types.
2273 startBuf++;
2274 }
2275 }
2276}
2277
2278void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
2279 QualType QT = ND->getType();
2280 const Type* TypePtr = QT->getAs<Type>();
2281 if (!isa<TypeOfExprType>(TypePtr))
2282 return;
2283 while (isa<TypeOfExprType>(TypePtr)) {
2284 const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
2285 QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
2286 TypePtr = QT->getAs<Type>();
2287 }
2288 // FIXME. This will not work for multiple declarators; as in:
2289 // __typeof__(a) b,c,d;
2290 std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
2291 SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
2292 const char *startBuf = SM->getCharacterData(DeclLoc);
2293 if (ND->getInit()) {
2294 std::string Name(ND->getNameAsString());
2295 TypeAsString += " " + Name + " = ";
2296 Expr *E = ND->getInit();
2297 SourceLocation startLoc;
2298 if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
2299 startLoc = ECE->getLParenLoc();
2300 else
2301 startLoc = E->getBeginLoc();
2302 startLoc = SM->getExpansionLoc(startLoc);
2303 const char *endBuf = SM->getCharacterData(startLoc);
2304 ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2305 }
2306 else {
2307 SourceLocation X = ND->getEndLoc();
2308 X = SM->getExpansionLoc(X);
2309 const char *endBuf = SM->getCharacterData(X);
2310 ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2311 }
2312}
2313
2314// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
2315void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
2316 IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
2317 SmallVector<QualType, 16> ArgTys;
2318 ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2319 QualType getFuncType =
2320 getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
2321 SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2322 SourceLocation(),
2323 SourceLocation(),
2324 SelGetUidIdent, getFuncType,
2325 nullptr, SC_Extern);
2326}
2327
2328void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
2329 // declared in <objc/objc.h>
2330 if (FD->getIdentifier() &&
2331 FD->getName() == "sel_registerName") {
2332 SelGetUidFunctionDecl = FD;
2333 return;
2334 }
2335 RewriteObjCQualifiedInterfaceTypes(FD);
2336}
2337
2338void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
2339 std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2340 const char *argPtr = TypeString.c_str();
2341 if (!strchr(argPtr, '^')) {
2342 Str += TypeString;
2343 return;
2344 }
2345 while (*argPtr) {
2346 Str += (*argPtr == '^' ? '*' : *argPtr);
2347 argPtr++;
2348 }
2349}
2350
2351// FIXME. Consolidate this routine with RewriteBlockPointerType.
2352void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
2353 ValueDecl *VD) {
2354 QualType Type = VD->getType();
2355 std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2356 const char *argPtr = TypeString.c_str();
2357 int paren = 0;
2358 while (*argPtr) {
2359 switch (*argPtr) {
2360 case '(':
2361 Str += *argPtr;
2362 paren++;
2363 break;
2364 case ')':
2365 Str += *argPtr;
2366 paren--;
2367 break;
2368 case '^':
2369 Str += '*';
2370 if (paren == 1)
2371 Str += VD->getNameAsString();
2372 break;
2373 default:
2374 Str += *argPtr;
2375 break;
2376 }
2377 argPtr++;
2378 }
2379}
2380
2381void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
2382 SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
2383 const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2384 const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
2385 if (!proto)
2386 return;
2387 QualType Type = proto->getReturnType();
2388 std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
2389 FdStr += " ";
2390 FdStr += FD->getName();
2391 FdStr += "(";
2392 unsigned numArgs = proto->getNumParams();
2393 for (unsigned i = 0; i < numArgs; i++) {
2394 QualType ArgType = proto->getParamType(i);
2395 RewriteBlockPointerType(FdStr, ArgType);
2396 if (i+1 < numArgs)
2397 FdStr += ", ";
2398 }
2399 if (FD->isVariadic()) {
2400 FdStr += (numArgs > 0) ? ", ...);\n" : "...);\n";
2401 }
2402 else
2403 FdStr += ");\n";
2404 InsertText(FunLocStart, FdStr);
2405}
2406
2407// SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
2408void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
2409 if (SuperConstructorFunctionDecl)
2410 return;
2411 IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
2412 SmallVector<QualType, 16> ArgTys;
2413 QualType argT = Context->getObjCIdType();
2414 assert(!argT.isNull() && "Can't find 'id' type")(static_cast<void> (0));
2415 ArgTys.push_back(argT);
2416 ArgTys.push_back(argT);
2417 QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2418 ArgTys);
2419 SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2420 SourceLocation(),
2421 SourceLocation(),
2422 msgSendIdent, msgSendType,
2423 nullptr, SC_Extern);
2424}
2425
2426// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
2427void RewriteModernObjC::SynthMsgSendFunctionDecl() {
2428 IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
2429 SmallVector<QualType, 16> ArgTys;
2430 QualType argT = Context->getObjCIdType();
2431 assert(!argT.isNull() && "Can't find 'id' type")(static_cast<void> (0));
2432 ArgTys.push_back(argT);
2433 argT = Context->getObjCSelType();
2434 assert(!argT.isNull() && "Can't find 'SEL' type")(static_cast<void> (0));
2435 ArgTys.push_back(argT);
2436 QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2437 ArgTys, /*variadic=*/true);
2438 MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2439 SourceLocation(),
2440 SourceLocation(),
2441 msgSendIdent, msgSendType, nullptr,
2442 SC_Extern);
2443}
2444
2445// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
2446void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
2447 IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
2448 SmallVector<QualType, 2> ArgTys;
2449 ArgTys.push_back(Context->VoidTy);
2450 QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2451 ArgTys, /*variadic=*/true);
2452 MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2453 SourceLocation(),
2454 SourceLocation(),
2455 msgSendIdent, msgSendType,
2456 nullptr, SC_Extern);
2457}
2458
2459// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
2460void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
2461 IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
2462 SmallVector<QualType, 16> ArgTys;
2463 QualType argT = Context->getObjCIdType();
2464 assert(!argT.isNull() && "Can't find 'id' type")(static_cast<void> (0));
2465 ArgTys.push_back(argT);
2466 argT = Context->getObjCSelType();
2467 assert(!argT.isNull() && "Can't find 'SEL' type")(static_cast<void> (0));
2468 ArgTys.push_back(argT);
2469 QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2470 ArgTys, /*variadic=*/true);
2471 MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2472 SourceLocation(),
2473 SourceLocation(),
2474 msgSendIdent, msgSendType,
2475 nullptr, SC_Extern);
2476}
2477
2478// SynthMsgSendSuperStretFunctionDecl -
2479// id objc_msgSendSuper_stret(void);
2480void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
2481 IdentifierInfo *msgSendIdent =
2482 &Context->Idents.get("objc_msgSendSuper_stret");
2483 SmallVector<QualType, 2> ArgTys;
2484 ArgTys.push_back(Context->VoidTy);
2485 QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2486 ArgTys, /*variadic=*/true);
2487 MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2488 SourceLocation(),
2489 SourceLocation(),
2490 msgSendIdent,
2491 msgSendType, nullptr,
2492 SC_Extern);
2493}
2494
2495// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
2496void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
2497 IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
2498 SmallVector<QualType, 16> ArgTys;
2499 QualType argT = Context->getObjCIdType();
2500 assert(!argT.isNull() && "Can't find 'id' type")(static_cast<void> (0));
2501 ArgTys.push_back(argT);
2502 argT = Context->getObjCSelType();
2503 assert(!argT.isNull() && "Can't find 'SEL' type")(static_cast<void> (0));
2504 ArgTys.push_back(argT);
2505 QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
2506 ArgTys, /*variadic=*/true);
2507 MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2508 SourceLocation(),
2509 SourceLocation(),
2510 msgSendIdent, msgSendType,
2511 nullptr, SC_Extern);
2512}
2513
2514// SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
2515void RewriteModernObjC::SynthGetClassFunctionDecl() {
2516 IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
2517 SmallVector<QualType, 16> ArgTys;
2518 ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2519 QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2520 ArgTys);
2521 GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2522 SourceLocation(),
2523 SourceLocation(),
2524 getClassIdent, getClassType,
2525 nullptr, SC_Extern);
2526}
2527
2528// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
2529void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
2530 IdentifierInfo *getSuperClassIdent =
2531 &Context->Idents.get("class_getSuperclass");
2532 SmallVector<QualType, 16> ArgTys;
2533 ArgTys.push_back(Context->getObjCClassType());
2534 QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2535 ArgTys);
2536 GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2537 SourceLocation(),
2538 SourceLocation(),
2539 getSuperClassIdent,
2540 getClassType, nullptr,
2541 SC_Extern);
2542}
2543
2544// SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
2545void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
2546 IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
2547 SmallVector<QualType, 16> ArgTys;
2548 ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2549 QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2550 ArgTys);
2551 GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2552 SourceLocation(),
2553 SourceLocation(),
2554 getClassIdent, getClassType,
2555 nullptr, SC_Extern);
2556}
2557
2558Stmt *RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
2559 assert (Exp != nullptr && "Expected non-null ObjCStringLiteral")(static_cast<void> (0));
2560 QualType strType = getConstantStringStructType();
2561
2562 std::string S = "__NSConstantStringImpl_";
2563
2564 std::string tmpName = InFileName;
2565 unsigned i;
2566 for (i=0; i < tmpName.length(); i++) {
2567 char c = tmpName.at(i);
2568 // replace any non-alphanumeric characters with '_'.
2569 if (!isAlphanumeric(c))
2570 tmpName[i] = '_';
2571 }
2572 S += tmpName;
2573 S += "_";
2574 S += utostr(NumObjCStringLiterals++);
2575
2576 Preamble += "static __NSConstantStringImpl " + S;
2577 Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
2578 Preamble += "0x000007c8,"; // utf8_str
2579 // The pretty printer for StringLiteral handles escape characters properly.
2580 std::string prettyBufS;
2581 llvm::raw_string_ostream prettyBuf(prettyBufS);
2582 Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
2583 Preamble += prettyBuf.str();
2584 Preamble += ",";
2585 Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
2586
2587 VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
2588 SourceLocation(), &Context->Idents.get(S),
2589 strType, nullptr, SC_Static);
2590 DeclRefExpr *DRE = new (Context)
2591 DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
2592 Expr *Unop = UnaryOperator::Create(
2593 const_cast<ASTContext &>(*Context), DRE, UO_AddrOf,
2594 Context->getPointerType(DRE->getType()), VK_PRValue, OK_Ordinary,
2595 SourceLocation(), false, FPOptionsOverride());
2596 // cast to NSConstantString *
2597 CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
2598 CK_CPointerToObjCPointerCast, Unop);
2599 ReplaceStmt(Exp, cast);
2600 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2601 return cast;
2602}
2603
2604Stmt *RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp) {
2605 unsigned IntSize =
2606 static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
2607
2608 Expr *FlagExp = IntegerLiteral::Create(*Context,
2609 llvm::APInt(IntSize, Exp->getValue()),
2610 Context->IntTy, Exp->getLocation());
2611 CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Context->ObjCBuiltinBoolTy,
2612 CK_BitCast, FlagExp);
2613 ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
2614 cast);
2615 ReplaceStmt(Exp, PE);
2616 return PE;
2617}
2618
2619Stmt *RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp) {
2620 // synthesize declaration of helper functions needed in this routine.
2621 if (!SelGetUidFunctionDecl)
2622 SynthSelGetUidFunctionDecl();
2623 // use objc_msgSend() for all.
2624 if (!MsgSendFunctionDecl)
2625 SynthMsgSendFunctionDecl();
2626 if (!GetClassFunctionDecl)
2627 SynthGetClassFunctionDecl();
2628
2629 FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2630 SourceLocation StartLoc = Exp->getBeginLoc();
2631 SourceLocation EndLoc = Exp->getEndLoc();
2632
2633 // Synthesize a call to objc_msgSend().
2634 SmallVector<Expr*, 4> MsgExprs;
2635 SmallVector<Expr*, 4> ClsExprs;
2636
2637 // Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
2638 ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
2639 ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
2640
2641 IdentifierInfo *clsName = BoxingClass->getIdentifier();
2642 ClsExprs.push_back(getStringLiteral(clsName->getName()));
2643 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2644 StartLoc, EndLoc);
2645 MsgExprs.push_back(Cls);
2646
2647 // Create a call to sel_registerName("<BoxingMethod>:"), etc.
2648 // it will be the 2nd argument.
2649 SmallVector<Expr*, 4> SelExprs;
2650 SelExprs.push_back(
2651 getStringLiteral(BoxingMethod->getSelector().getAsString()));
2652 CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2653 SelExprs, StartLoc, EndLoc);
2654 MsgExprs.push_back(SelExp);
2655
2656 // User provided sub-expression is the 3rd, and last, argument.
2657 Expr *subExpr = Exp->getSubExpr();
2658 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(subExpr)) {
2659 QualType type = ICE->getType();
2660 const Expr *SubExpr = ICE->IgnoreParenImpCasts();
2661 CastKind CK = CK_BitCast;
2662 if (SubExpr->getType()->isIntegralType(*Context) && type->isBooleanType())
2663 CK = CK_IntegralToBoolean;
2664 subExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, subExpr);
2665 }
2666 MsgExprs.push_back(subExpr);
2667
2668 SmallVector<QualType, 4> ArgTypes;
2669 ArgTypes.push_back(Context->getObjCClassType());
2670 ArgTypes.push_back(Context->getObjCSelType());
2671 for (const auto PI : BoxingMethod->parameters())
2672 ArgTypes.push_back(PI->getType());
2673
2674 QualType returnType = Exp->getType();
2675 // Get the type, we will need to reference it in a couple spots.
2676 QualType msgSendType = MsgSendFlavor->getType();
2677
2678 // Create a reference to the objc_msgSend() declaration.
2679 DeclRefExpr *DRE = new (Context) DeclRefExpr(
2680 *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2681
2682 CastExpr *cast = NoTypeInfoCStyleCastExpr(
2683 Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2684
2685 // Now do the "normal" pointer to function cast.
2686 QualType castType =
2687 getSimpleFunctionType(returnType, ArgTypes, BoxingMethod->isVariadic());
2688 castType = Context->getPointerType(castType);
2689 cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2690 cast);
2691
2692 // Don't forget the parens to enforce the proper binding.
2693 ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2694
2695 auto *FT = msgSendType->castAs<FunctionType>();
2696 CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2697 VK_PRValue, EndLoc, FPOptionsOverride());
2698 ReplaceStmt(Exp, CE);
2699 return CE;
2700}
2701
2702Stmt *RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp) {
2703 // synthesize declaration of helper functions needed in this routine.
2704 if (!SelGetUidFunctionDecl)
2705 SynthSelGetUidFunctionDecl();
2706 // use objc_msgSend() for all.
2707 if (!MsgSendFunctionDecl)
2708 SynthMsgSendFunctionDecl();
2709 if (!GetClassFunctionDecl)
2710 SynthGetClassFunctionDecl();
2711
2712 FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2713 SourceLocation StartLoc = Exp->getBeginLoc();
2714 SourceLocation EndLoc = Exp->getEndLoc();
2715
2716 // Build the expression: __NSContainer_literal(int, ...).arr
2717 QualType IntQT = Context->IntTy;
2718 QualType NSArrayFType =
2719 getSimpleFunctionType(Context->VoidTy, IntQT, true);
2720 std::string NSArrayFName("__NSContainer_literal");
2721 FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(NSArrayFName);
2722 DeclRefExpr *NSArrayDRE = new (Context) DeclRefExpr(
2723 *Context, NSArrayFD, false, NSArrayFType, VK_PRValue, SourceLocation());
2724
2725 SmallVector<Expr*, 16> InitExprs;
2726 unsigned NumElements = Exp->getNumElements();
2727 unsigned UnsignedIntSize =
2728 static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2729 Expr *count = IntegerLiteral::Create(*Context,
2730 llvm::APInt(UnsignedIntSize, NumElements),
2731 Context->UnsignedIntTy, SourceLocation());
2732 InitExprs.push_back(count);
2733 for (unsigned i = 0; i < NumElements; i++)
2734 InitExprs.push_back(Exp->getElement(i));
2735 Expr *NSArrayCallExpr =
2736 CallExpr::Create(*Context, NSArrayDRE, InitExprs, NSArrayFType, VK_LValue,
2737 SourceLocation(), FPOptionsOverride());
2738
2739 FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2740 SourceLocation(),
2741 &Context->Idents.get("arr"),
2742 Context->getPointerType(Context->VoidPtrTy),
2743 nullptr, /*BitWidth=*/nullptr,
2744 /*Mutable=*/true, ICIS_NoInit);
2745 MemberExpr *ArrayLiteralME =
2746 MemberExpr::CreateImplicit(*Context, NSArrayCallExpr, false, ARRFD,
2747 ARRFD->getType(), VK_LValue, OK_Ordinary);
2748 QualType ConstIdT = Context->getObjCIdType().withConst();
2749 CStyleCastExpr * ArrayLiteralObjects =
2750 NoTypeInfoCStyleCastExpr(Context,
2751 Context->getPointerType(ConstIdT),
2752 CK_BitCast,
2753 ArrayLiteralME);
2754
2755 // Synthesize a call to objc_msgSend().
2756 SmallVector<Expr*, 32> MsgExprs;
2757 SmallVector<Expr*, 4> ClsExprs;
2758 QualType expType = Exp->getType();
2759
2760 // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2761 ObjCInterfaceDecl *Class =
2762 expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2763
2764 IdentifierInfo *clsName = Class->getIdentifier();
2765 ClsExprs.push_back(getStringLiteral(clsName->getName()));
2766 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2767 StartLoc, EndLoc);
2768 MsgExprs.push_back(Cls);
2769
2770 // Create a call to sel_registerName("arrayWithObjects:count:").
2771 // it will be the 2nd argument.
2772 SmallVector<Expr*, 4> SelExprs;
2773 ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
2774 SelExprs.push_back(
2775 getStringLiteral(ArrayMethod->getSelector().getAsString()));
2776 CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2777 SelExprs, StartLoc, EndLoc);
2778 MsgExprs.push_back(SelExp);
2779
2780 // (const id [])objects
2781 MsgExprs.push_back(ArrayLiteralObjects);
2782
2783 // (NSUInteger)cnt
2784 Expr *cnt = IntegerLiteral::Create(*Context,
2785 llvm::APInt(UnsignedIntSize, NumElements),
2786 Context->UnsignedIntTy, SourceLocation());
2787 MsgExprs.push_back(cnt);
2788
2789 SmallVector<QualType, 4> ArgTypes;
2790 ArgTypes.push_back(Context->getObjCClassType());
2791 ArgTypes.push_back(Context->getObjCSelType());
2792 for (const auto *PI : ArrayMethod->parameters())
2793 ArgTypes.push_back(PI->getType());
2794
2795 QualType returnType = Exp->getType();
2796 // Get the type, we will need to reference it in a couple spots.
2797 QualType msgSendType = MsgSendFlavor->getType();
2798
2799 // Create a reference to the objc_msgSend() declaration.
2800 DeclRefExpr *DRE = new (Context) DeclRefExpr(
2801 *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2802
2803 CastExpr *cast = NoTypeInfoCStyleCastExpr(
2804 Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2805
2806 // Now do the "normal" pointer to function cast.
2807 QualType castType =
2808 getSimpleFunctionType(returnType, ArgTypes, ArrayMethod->isVariadic());
2809 castType = Context->getPointerType(castType);
2810 cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2811 cast);
2812
2813 // Don't forget the parens to enforce the proper binding.
2814 ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2815
2816 const FunctionType *FT = msgSendType->castAs<FunctionType>();
2817 CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2818 VK_PRValue, EndLoc, FPOptionsOverride());
2819 ReplaceStmt(Exp, CE);
2820 return CE;
2821}
2822
2823Stmt *RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp) {
2824 // synthesize declaration of helper functions needed in this routine.
2825 if (!SelGetUidFunctionDecl)
2826 SynthSelGetUidFunctionDecl();
2827 // use objc_msgSend() for all.
2828 if (!MsgSendFunctionDecl)
2829 SynthMsgSendFunctionDecl();
2830 if (!GetClassFunctionDecl)
2831 SynthGetClassFunctionDecl();
2832
2833 FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2834 SourceLocation StartLoc = Exp->getBeginLoc();
2835 SourceLocation EndLoc = Exp->getEndLoc();
2836
2837 // Build the expression: __NSContainer_literal(int, ...).arr
2838 QualType IntQT = Context->IntTy;
2839 QualType NSDictFType =
2840 getSimpleFunctionType(Context->VoidTy, IntQT, true);
2841 std::string NSDictFName("__NSContainer_literal");
2842 FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(NSDictFName);
2843 DeclRefExpr *NSDictDRE = new (Context) DeclRefExpr(
2844 *Context, NSDictFD, false, NSDictFType, VK_PRValue, SourceLocation());
2845
2846 SmallVector<Expr*, 16> KeyExprs;
2847 SmallVector<Expr*, 16> ValueExprs;
2848
2849 unsigned NumElements = Exp->getNumElements();
2850 unsigned UnsignedIntSize =
2851 static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2852 Expr *count = IntegerLiteral::Create(*Context,
2853 llvm::APInt(UnsignedIntSize, NumElements),
2854 Context->UnsignedIntTy, SourceLocation());
2855 KeyExprs.push_back(count);
2856 ValueExprs.push_back(count);
2857 for (unsigned i = 0; i < NumElements; i++) {
2858 ObjCDictionaryElement Element = Exp->getKeyValueElement(i);
2859 KeyExprs.push_back(Element.Key);
2860 ValueExprs.push_back(Element.Value);
2861 }
2862
2863 // (const id [])objects
2864 Expr *NSValueCallExpr =
2865 CallExpr::Create(*Context, NSDictDRE, ValueExprs, NSDictFType, VK_LValue,
2866 SourceLocation(), FPOptionsOverride());
2867
2868 FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2869 SourceLocation(),
2870 &Context->Idents.get("arr"),
2871 Context->getPointerType(Context->VoidPtrTy),
2872 nullptr, /*BitWidth=*/nullptr,
2873 /*Mutable=*/true, ICIS_NoInit);
2874 MemberExpr *DictLiteralValueME =
2875 MemberExpr::CreateImplicit(*Context, NSValueCallExpr, false, ARRFD,
2876 ARRFD->getType(), VK_LValue, OK_Ordinary);
2877 QualType ConstIdT = Context->getObjCIdType().withConst();
2878 CStyleCastExpr * DictValueObjects =
2879 NoTypeInfoCStyleCastExpr(Context,
2880 Context->getPointerType(ConstIdT),
2881 CK_BitCast,
2882 DictLiteralValueME);
2883 // (const id <NSCopying> [])keys
2884 Expr *NSKeyCallExpr =
2885 CallExpr::Create(*Context, NSDictDRE, KeyExprs, NSDictFType, VK_LValue,
2886 SourceLocation(), FPOptionsOverride());
2887
2888 MemberExpr *DictLiteralKeyME =
2889 MemberExpr::CreateImplicit(*Context, NSKeyCallExpr, false, ARRFD,
2890 ARRFD->getType(), VK_LValue, OK_Ordinary);
2891
2892 CStyleCastExpr * DictKeyObjects =
2893 NoTypeInfoCStyleCastExpr(Context,
2894 Context->getPointerType(ConstIdT),
2895 CK_BitCast,
2896 DictLiteralKeyME);
2897
2898 // Synthesize a call to objc_msgSend().
2899 SmallVector<Expr*, 32> MsgExprs;
2900 SmallVector<Expr*, 4> ClsExprs;
2901 QualType expType = Exp->getType();
2902
2903 // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2904 ObjCInterfaceDecl *Class =
2905 expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2906
2907 IdentifierInfo *clsName = Class->getIdentifier();
2908 ClsExprs.push_back(getStringLiteral(clsName->getName()));
2909 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2910 StartLoc, EndLoc);
2911 MsgExprs.push_back(Cls);
2912
2913 // Create a call to sel_registerName("arrayWithObjects:count:").
2914 // it will be the 2nd argument.
2915 SmallVector<Expr*, 4> SelExprs;
2916 ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
2917 SelExprs.push_back(getStringLiteral(DictMethod->getSelector().getAsString()));
2918 CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2919 SelExprs, StartLoc, EndLoc);
2920 MsgExprs.push_back(SelExp);
2921
2922 // (const id [])objects
2923 MsgExprs.push_back(DictValueObjects);
2924
2925 // (const id <NSCopying> [])keys
2926 MsgExprs.push_back(DictKeyObjects);
2927
2928 // (NSUInteger)cnt
2929 Expr *cnt = IntegerLiteral::Create(*Context,
2930 llvm::APInt(UnsignedIntSize, NumElements),
2931 Context->UnsignedIntTy, SourceLocation());
2932 MsgExprs.push_back(cnt);
2933
2934 SmallVector<QualType, 8> ArgTypes;
2935 ArgTypes.push_back(Context->getObjCClassType());
2936 ArgTypes.push_back(Context->getObjCSelType());
2937 for (const auto *PI : DictMethod->parameters()) {
2938 QualType T = PI->getType();
2939 if (const PointerType* PT = T->getAs<PointerType>()) {
2940 QualType PointeeTy = PT->getPointeeType();
2941 convertToUnqualifiedObjCType(PointeeTy);
2942 T = Context->getPointerType(PointeeTy);
2943 }
2944 ArgTypes.push_back(T);
2945 }
2946
2947 QualType returnType = Exp->getType();
2948 // Get the type, we will need to reference it in a couple spots.
2949 QualType msgSendType = MsgSendFlavor->getType();
2950
2951 // Create a reference to the objc_msgSend() declaration.
2952 DeclRefExpr *DRE = new (Context) DeclRefExpr(
2953 *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2954
2955 CastExpr *cast = NoTypeInfoCStyleCastExpr(
2956 Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2957
2958 // Now do the "normal" pointer to function cast.
2959 QualType castType =
2960 getSimpleFunctionType(returnType, ArgTypes, DictMethod->isVariadic());
2961 castType = Context->getPointerType(castType);
2962 cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2963 cast);
2964
2965 // Don't forget the parens to enforce the proper binding.
2966 ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2967
2968 const FunctionType *FT = msgSendType->castAs<FunctionType>();
2969 CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2970 VK_PRValue, EndLoc, FPOptionsOverride());
2971 ReplaceStmt(Exp, CE);
2972 return CE;
2973}
2974
2975// struct __rw_objc_super {
2976// struct objc_object *object; struct objc_object *superClass;
2977// };
2978QualType RewriteModernObjC::getSuperStructType() {
2979 if (!SuperStructDecl) {
2980 SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
2981 SourceLocation(), SourceLocation(),
2982 &Context->Idents.get("__rw_objc_super"));
2983 QualType FieldTypes[2];
2984
2985 // struct objc_object *object;
2986 FieldTypes[0] = Context->getObjCIdType();
2987 // struct objc_object *superClass;
2988 FieldTypes[1] = Context->getObjCIdType();
2989
2990 // Create fields
2991 for (unsigned i = 0; i < 2; ++i) {
2992 SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
2993 SourceLocation(),
2994 SourceLocation(), nullptr,
2995 FieldTypes[i], nullptr,
2996 /*BitWidth=*/nullptr,
2997 /*Mutable=*/false,
2998 ICIS_NoInit));
2999 }
3000
3001 SuperStructDecl->completeDefinition();
3002 }
3003 return Context->getTagDeclType(SuperStructDecl);
3004}
3005
3006QualType RewriteModernObjC::getConstantStringStructType() {
3007 if (!ConstantStringDecl) {
3008 ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
3009 SourceLocation(), SourceLocation(),
3010 &Context->Idents.get("__NSConstantStringImpl"));
3011 QualType FieldTypes[4];
3012
3013 // struct objc_object *receiver;
3014 FieldTypes[0] = Context->getObjCIdType();
3015 // int flags;
3016 FieldTypes[1] = Context->IntTy;
3017 // char *str;
3018 FieldTypes[2] = Context->getPointerType(Context->CharTy);
3019 // long length;
3020 FieldTypes[3] = Context->LongTy;
3021
3022 // Create fields
3023 for (unsigned i = 0; i < 4; ++i) {
3024 ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
3025 ConstantStringDecl,
3026 SourceLocation(),
3027 SourceLocation(), nullptr,
3028 FieldTypes[i], nullptr,
3029 /*BitWidth=*/nullptr,
3030 /*Mutable=*/true,
3031 ICIS_NoInit));
3032 }
3033
3034 ConstantStringDecl->completeDefinition();
3035 }
3036 return Context->getTagDeclType(ConstantStringDecl);
3037}
3038
3039/// getFunctionSourceLocation - returns start location of a function
3040/// definition. Complication arises when function has declared as
3041/// extern "C" or extern "C" {...}
3042static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
3043 FunctionDecl *FD) {
3044 if (FD->isExternC() && !FD->isMain()) {
3045 const DeclContext *DC = FD->getDeclContext();
3046 if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3047 // if it is extern "C" {...}, return function decl's own location.
3048 if (!LSD->getRBraceLoc().isValid())
3049 return LSD->getExternLoc();
3050 }
3051 if (FD->getStorageClass() != SC_None)
3052 R.RewriteBlockLiteralFunctionDecl(FD);
3053 return FD->getTypeSpecStartLoc();
3054}
3055
3056void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
3057
3058 SourceLocation Location = D->getLocation();
3059
3060 if (Location.isFileID() && GenerateLineInfo) {
3061 std::string LineString("\n#line ");
3062 PresumedLoc PLoc = SM->getPresumedLoc(Location);
3063 LineString += utostr(PLoc.getLine());
3064 LineString += " \"";
3065 LineString += Lexer::Stringify(PLoc.getFilename());
3066 if (isa<ObjCMethodDecl>(D))
3067 LineString += "\"";
3068 else LineString += "\"\n";
3069
3070 Location = D->getBeginLoc();
3071 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
3072 if (FD->isExternC() && !FD->isMain()) {
3073 const DeclContext *DC = FD->getDeclContext();
3074 if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3075 // if it is extern "C" {...}, return function decl's own location.
3076 if (!LSD->getRBraceLoc().isValid())
3077 Location = LSD->getExternLoc();
3078 }
3079 }
3080 InsertText(Location, LineString);
3081 }
3082}
3083
3084/// SynthMsgSendStretCallExpr - This routine translates message expression
3085/// into a call to objc_msgSend_stret() entry point. Tricky part is that
3086/// nil check on receiver must be performed before calling objc_msgSend_stret.
3087/// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
3088/// msgSendType - function type of objc_msgSend_stret(...)
3089/// returnType - Result type of the method being synthesized.
3090/// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
3091/// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
3092/// starting with receiver.
3093/// Method - Method being rewritten.
3094Expr *RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
3095 QualType returnType,
3096 SmallVectorImpl<QualType> &ArgTypes,
3097 SmallVectorImpl<Expr*> &MsgExprs,
3098 ObjCMethodDecl *Method) {
3099 // Now do the "normal" pointer to function cast.
3100 QualType FuncType = getSimpleFunctionType(
3101 returnType, ArgTypes, Method ? Method->isVariadic() : false);
3102 QualType castType = Context->getPointerType(FuncType);
3103
3104 // build type for containing the objc_msgSend_stret object.
3105 static unsigned stretCount=0;
3106 std::string name = "__Stret"; name += utostr(stretCount);
3107 std::string str =
3108 "extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
3109 str += "namespace {\n";
3110 str += "struct "; str += name;
3111 str += " {\n\t";
3112 str += name;
3113 str += "(id receiver, SEL sel";
3114 for (unsigned i = 2; i < ArgTypes.size(); i++) {
3115 std::string ArgName = "arg"; ArgName += utostr(i);
3116 ArgTypes[i].getAsStringInternal(ArgName, Context->getPrintingPolicy());
3117 str += ", "; str += ArgName;
3118 }
3119 // could be vararg.
3120 for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3121 std::string ArgName = "arg"; ArgName += utostr(i);
3122 MsgExprs[i]->getType().getAsStringInternal(ArgName,
3123 Context->getPrintingPolicy());
3124 str += ", "; str += ArgName;
3125 }
3126
3127 str += ") {\n";
3128 str += "\t unsigned size = sizeof(";
3129 str += returnType.getAsString(Context->getPrintingPolicy()); str += ");\n";
3130
3131 str += "\t if (size == 1 || size == 2 || size == 4 || size == 8)\n";
3132
3133 str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3134 str += ")(void *)objc_msgSend)(receiver, sel";
3135 for (unsigned i = 2; i < ArgTypes.size(); i++) {
3136 str += ", arg"; str += utostr(i);
3137 }
3138 // could be vararg.
3139 for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3140 str += ", arg"; str += utostr(i);
3141 }
3142 str+= ");\n";
3143
3144 str += "\t else if (receiver == 0)\n";
3145 str += "\t memset((void*)&s, 0, sizeof(s));\n";
3146 str += "\t else\n";
3147
3148 str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3149 str += ")(void *)objc_msgSend_stret)(receiver, sel";
3150 for (unsigned i = 2; i < ArgTypes.size(); i++) {
3151 str += ", arg"; str += utostr(i);
3152 }
3153 // could be vararg.
3154 for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3155 str += ", arg"; str += utostr(i);
3156 }
3157 str += ");\n";
3158
3159 str += "\t}\n";
3160 str += "\t"; str += returnType.getAsString(Context->getPrintingPolicy());
3161 str += " s;\n";
3162 str += "};\n};\n\n";
3163 SourceLocation FunLocStart;
3164 if (CurFunctionDef)
3165 FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
3166 else {
3167 assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null")(static_cast<void> (0));
3168 FunLocStart = CurMethodDef->getBeginLoc();
3169 }
3170
3171 InsertText(FunLocStart, str);
3172 ++stretCount;
3173
3174 // AST for __Stretn(receiver, args).s;
3175 IdentifierInfo *ID = &Context->Idents.get(name);
3176 FunctionDecl *FD =
3177 FunctionDecl::Create(*Context, TUDecl, SourceLocation(), SourceLocation(),
3178 ID, FuncType, nullptr, SC_Extern, false, false);
3179 DeclRefExpr *DRE = new (Context)
3180 DeclRefExpr(*Context, FD, false, castType, VK_PRValue, SourceLocation());
3181 CallExpr *STCE =
3182 CallExpr::Create(*Context, DRE, MsgExprs, castType, VK_LValue,
3183 SourceLocation(), FPOptionsOverride());
3184
3185 FieldDecl *FieldD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
3186 SourceLocation(),
3187 &Context->Idents.get("s"),
3188 returnType, nullptr,
3189 /*BitWidth=*/nullptr,
3190 /*Mutable=*/true, ICIS_NoInit);
3191 MemberExpr *ME = MemberExpr::CreateImplicit(
3192 *Context, STCE, false, FieldD, FieldD->getType(), VK_LValue, OK_Ordinary);
3193
3194 return ME;
3195}
3196
3197Stmt *RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
3198 SourceLocation StartLoc,
3199 SourceLocation EndLoc) {
3200 if (!SelGetUidFunctionDecl)
3201 SynthSelGetUidFunctionDecl();
3202 if (!MsgSendFunctionDecl)
3203 SynthMsgSendFunctionDecl();
3204 if (!MsgSendSuperFunctionDecl)
3205 SynthMsgSendSuperFunctionDecl();
3206 if (!MsgSendStretFunctionDecl)
3207 SynthMsgSendStretFunctionDecl();
3208 if (!MsgSendSuperStretFunctionDecl)
3209 SynthMsgSendSuperStretFunctionDecl();
3210 if (!MsgSendFpretFunctionDecl)
3211 SynthMsgSendFpretFunctionDecl();
3212 if (!GetClassFunctionDecl)
3213 SynthGetClassFunctionDecl();
3214 if (!GetSuperClassFunctionDecl)
3215 SynthGetSuperClassFunctionDecl();
3216 if (!GetMetaClassFunctionDecl)
3217 SynthGetMetaClassFunctionDecl();
3218
3219 // default to objc_msgSend().
3220 FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
3221 // May need to use objc_msgSend_stret() as well.
3222 FunctionDecl *MsgSendStretFlavor = nullptr;
3223 if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
3224 QualType resultType = mDecl->getReturnType();
3225 if (resultType->isRecordType())
3226 MsgSendStretFlavor = MsgSendStretFunctionDecl;
3227 else if (resultType->isRealFloatingType())
3228 MsgSendFlavor = MsgSendFpretFunctionDecl;
3229 }
3230
3231 // Synthesize a call to objc_msgSend().
3232 SmallVector<Expr*, 8> MsgExprs;
3233 switch (Exp->getReceiverKind()) {
3234 case ObjCMessageExpr::SuperClass: {
3235 MsgSendFlavor = MsgSendSuperFunctionDecl;
3236 if (MsgSendStretFlavor)
3237 MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3238 assert(MsgSendFlavor && "MsgSendFlavor is NULL!")(static_cast<void> (0));
3239
3240 ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3241
3242 SmallVector<Expr*, 4> InitExprs;
3243
3244 // set the receiver to self, the first argument to all methods.
3245 InitExprs.push_back(NoTypeInfoCStyleCastExpr(
3246 Context, Context->getObjCIdType(), CK_BitCast,
3247 new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
3248 Context->getObjCIdType(), VK_PRValue,
3249 SourceLocation()))); // set the 'receiver'.
3250
3251 // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3252 SmallVector<Expr*, 8> ClsExprs;
3253 ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3254 // (Class)objc_getClass("CurrentClass")
3255 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
3256 ClsExprs, StartLoc, EndLoc);
3257 ClsExprs.clear();
3258 ClsExprs.push_back(Cls);
3259 Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
3260 StartLoc, EndLoc);
3261
3262 // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3263 // To turn off a warning, type-cast to 'id'
3264 InitExprs.push_back( // set 'super class', using class_getSuperclass().
3265 NoTypeInfoCStyleCastExpr(Context,
3266 Context->getObjCIdType(),
3267 CK_BitCast, Cls));
3268 // struct __rw_objc_super
3269 QualType superType = getSuperStructType();
3270 Expr *SuperRep;
3271
3272 if (LangOpts.MicrosoftExt) {
3273 SynthSuperConstructorFunctionDecl();
3274 // Simulate a constructor call...
3275 DeclRefExpr *DRE = new (Context)
3276 DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3277 VK_LValue, SourceLocation());
3278 SuperRep =
3279 CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3280 SourceLocation(), FPOptionsOverride());
3281 // The code for super is a little tricky to prevent collision with
3282 // the structure definition in the header. The rewriter has it's own
3283 // internal definition (__rw_objc_super) that is uses. This is why
3284 // we need the cast below. For example:
3285 // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3286 //
3287 SuperRep = UnaryOperator::Create(
3288 const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3289 Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
3290 SourceLocation(), false, FPOptionsOverride());
3291 SuperRep = NoTypeInfoCStyleCastExpr(Context,
3292 Context->getPointerType(superType),
3293 CK_BitCast, SuperRep);
3294 } else {
3295 // (struct __rw_objc_super) { <exprs from above> }
3296 InitListExpr *ILE =
3297 new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3298 SourceLocation());
3299 TypeSourceInfo *superTInfo
3300 = Context->getTrivialTypeSourceInfo(superType);
3301 SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3302 superType, VK_LValue,
3303 ILE, false);
3304 // struct __rw_objc_super *
3305 SuperRep = UnaryOperator::Create(
3306 const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3307 Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
3308 SourceLocation(), false, FPOptionsOverride());
3309 }
3310 MsgExprs.push_back(SuperRep);
3311 break;
3312 }
3313
3314 case ObjCMessageExpr::Class: {
3315 SmallVector<Expr*, 8> ClsExprs;
3316 ObjCInterfaceDecl *Class
3317 = Exp->getClassReceiver()->castAs<ObjCObjectType>()->getInterface();
3318 IdentifierInfo *clsName = Class->getIdentifier();
3319 ClsExprs.push_back(getStringLiteral(clsName->getName()));
3320 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3321 StartLoc, EndLoc);
3322 CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
3323 Context->getObjCIdType(),
3324 CK_BitCast, Cls);
3325 MsgExprs.push_back(ArgExpr);
3326 break;
3327 }
3328
3329 case ObjCMessageExpr::SuperInstance:{
3330 MsgSendFlavor = MsgSendSuperFunctionDecl;
3331 if (MsgSendStretFlavor)
3332 MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3333 assert(MsgSendFlavor && "MsgSendFlavor is NULL!")(static_cast<void> (0));
3334 ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3335 SmallVector<Expr*, 4> InitExprs;
3336
3337 InitExprs.push_back(NoTypeInfoCStyleCastExpr(
3338 Context, Context->getObjCIdType(), CK_BitCast,
3339 new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
3340 Context->getObjCIdType(), VK_PRValue,
3341 SourceLocation()))); // set the 'receiver'.
3342
3343 // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3344 SmallVector<Expr*, 8> ClsExprs;
3345 ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3346 // (Class)objc_getClass("CurrentClass")
3347 CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3348 StartLoc, EndLoc);
3349 ClsExprs.clear();
3350 ClsExprs.push_back(Cls);
3351 Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
3352 StartLoc, EndLoc);
3353
3354 // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3355 // To turn off a warning, type-cast to 'id'
3356 InitExprs.push_back(
3357 // set 'super class', using class_getSuperclass().
3358 NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3359 CK_BitCast, Cls));
3360 // struct __rw_objc_super
3361 QualType superType = getSuperStructType();
3362 Expr *SuperRep;
3363
3364 if (LangOpts.MicrosoftExt) {
3365 SynthSuperConstructorFunctionDecl();
3366 // Simulate a constructor call...
3367 DeclRefExpr *DRE = new (Context)
3368 DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3369 VK_LValue, SourceLocation());
3370 SuperRep =
3371 CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3372 SourceLocation(), FPOptionsOverride());
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 = UnaryOperator::Create(
3380 const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3381 Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
3382 SourceLocation(), false, FPOptionsOverride());
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(
3394 SourceLocation(), superTInfo, superType, VK_PRValue, ILE, false);
3395 }
3396 MsgExprs.push_back(SuperRep);
3397 break;
3398 }
3399
3400 case ObjCMessageExpr::Instance: {
3401 // Remove all type-casts because it may contain objc-style types; e.g.
3402 // Foo<Proto> *.
3403 Expr *recExpr = Exp->getInstanceReceiver();
3404 while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
3405 recExpr = CE->getSubExpr();
3406 CastKind CK = recExpr->getType()->isObjCObjectPointerType()
3407 ? CK_BitCast : recExpr->getType()->isBlockPointerType()
3408 ? CK_BlockPointerToObjCPointerCast
3409 : CK_CPointerToObjCPointerCast;
3410
3411 recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3412 CK, recExpr);
3413 MsgExprs.push_back(recExpr);
3414 break;
3415 }
3416 }
3417
3418 // Create a call to sel_registerName("selName"), it will be the 2nd argument.
3419 SmallVector<Expr*, 8> SelExprs;
3420 SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
3421 CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
3422 SelExprs, StartLoc, EndLoc);
3423 MsgExprs.push_back(SelExp);
3424
3425 // Now push any user supplied arguments.
3426 for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
3427 Expr *userExpr = Exp->getArg(i);
3428 // Make all implicit casts explicit...ICE comes in handy:-)
3429 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
3430 // Reuse the ICE type, it is exactly what the doctor ordered.
3431 QualType type = ICE->getType();
3432 if (needToScanForQualifiers(type))
3433 type = Context->getObjCIdType();
3434 // Make sure we convert "type (^)(...)" to "type (*)(...)".
3435 (void)convertBlockPointerToFunctionPointer(type);
3436 const Expr *SubExpr = ICE->IgnoreParenImpCasts();
3437 CastKind CK;
3438 if (SubExpr->getType()->isIntegralType(*Context) &&
3439 type->isBooleanType()) {
3440 CK = CK_IntegralToBoolean;
3441 } else if (type->isObjCObjectPointerType()) {
3442 if (SubExpr->getType()->isBlockPointerType()) {
3443 CK = CK_BlockPointerToObjCPointerCast;
3444 } else if (SubExpr->getType()->isPointerType()) {
3445 CK = CK_CPointerToObjCPointerCast;
3446 } else {
3447 CK = CK_BitCast;
3448 }
3449 } else {
3450 CK = CK_BitCast;
3451 }
3452
3453 userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
3454 }
3455 // Make id<P...> cast into an 'id' cast.
3456 else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
3457 if (CE->getType()->isObjCQualifiedIdType()) {
3458 while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
3459 userExpr = CE->getSubExpr();
3460 CastKind CK;
3461 if (userExpr->getType()->isIntegralType(*Context)) {
3462 CK = CK_IntegralToPointer;
3463 } else if (userExpr->getType()->isBlockPointerType()) {
3464 CK = CK_BlockPointerToObjCPointerCast;
3465 } else if (userExpr->getType()->isPointerType()) {
3466 CK = CK_CPointerToObjCPointerCast;
3467 } else {
3468 CK = CK_BitCast;
3469 }
3470 userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3471 CK, userExpr);
3472 }
3473 }
3474 MsgExprs.push_back(userExpr);
3475 // We've transferred the ownership to MsgExprs. For now, we *don't* null
3476 // out the argument in the original expression (since we aren't deleting
3477 // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
3478 //Exp->setArg(i, 0);
3479 }
3480 // Generate the funky cast.
3481 CastExpr *cast;
3482 SmallVector<QualType, 8> ArgTypes;
3483 QualType returnType;
3484
3485 // Push 'id' and 'SEL', the 2 implicit arguments.
3486 if (MsgSendFlavor == MsgSendSuperFunctionDecl)
3487 ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
3488 else
3489 ArgTypes.push_back(Context->getObjCIdType());
3490 ArgTypes.push_back(Context->getObjCSelType());
3491 if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
3492 // Push any user argument types.
3493 for (const auto *PI : OMD->parameters()) {
3494 QualType t = PI->getType()->isObjCQualifiedIdType()
3495 ? Context->getObjCIdType()
3496 : PI->getType();
3497 // Make sure we convert "t (^)(...)" to "t (*)(...)".
3498 (void)convertBlockPointerToFunctionPointer(t);
3499 ArgTypes.push_back(t);
3500 }
3501 returnType = Exp->getType();
3502 convertToUnqualifiedObjCType(returnType);
3503 (void)convertBlockPointerToFunctionPointer(returnType);
3504 } else {
3505 returnType = Context->getObjCIdType();
3506 }
3507 // Get the type, we will need to reference it in a couple spots.
3508 QualType msgSendType = MsgSendFlavor->getType();
3509
3510 // Create a reference to the objc_msgSend() declaration.
3511 DeclRefExpr *DRE = new (Context) DeclRefExpr(
3512 *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
3513
3514 // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
3515 // If we don't do this cast, we get the following bizarre warning/note:
3516 // xx.m:13: warning: function called through a non-compatible type
3517 // xx.m:13: note: if this code is reached, the program will abort
3518 cast = NoTypeInfoCStyleCastExpr(Context,
3519 Context->getPointerType(Context->VoidTy),
3520 CK_BitCast, DRE);
3521
3522 // Now do the "normal" pointer to function cast.
3523 // If we don't have a method decl, force a variadic cast.
3524 const ObjCMethodDecl *MD = Exp->getMethodDecl();
3525 QualType castType =
3526 getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
3527 castType = Context->getPointerType(castType);
3528 cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
3529 cast);
3530
3531 // Don't forget the parens to enforce the proper binding.
3532 ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
3533
3534 const FunctionType *FT = msgSendType->castAs<FunctionType>();
3535 CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
3536 VK_PRValue, EndLoc, FPOptionsOverride());
3537 Stmt *ReplacingStmt = CE;
3538 if (MsgSendStretFlavor) {
3539 // We have the method which returns a struct/union. Must also generate
3540 // call to objc_msgSend_stret and hang both varieties on a conditional
3541 // expression which dictate which one to envoke depending on size of
3542 // method's return type.
3543
3544 Expr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
3545 returnType,
3546 ArgTypes, MsgExprs,
3547 Exp->getMethodDecl());
3548 ReplacingStmt = STCE;
3549 }
3550 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3551 return ReplacingStmt;
3552}
3553
3554Stmt *RewriteModernObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
3555 Stmt *ReplacingStmt =
3556 SynthMessageExpr(Exp, Exp->getBeginLoc(), Exp->getEndLoc());
3557
3558 // Now do the actual rewrite.
3559 ReplaceStmt(Exp, ReplacingStmt);
3560
3561 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3562 return ReplacingStmt;
3563}
3564
3565// typedef struct objc_object Protocol;
3566QualType RewriteModernObjC::getProtocolType() {
3567 if (!ProtocolTypeDecl) {
3568 TypeSourceInfo *TInfo
3569 = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
3570 ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
3571 SourceLocation(), SourceLocation(),
3572 &Context->Idents.get("Protocol"),
3573 TInfo);
3574 }
3575 return Context->getTypeDeclType(ProtocolTypeDecl);
3576}
3577
3578/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
3579/// a synthesized/forward data reference (to the protocol's metadata).
3580/// The forward references (and metadata) are generated in
3581/// RewriteModernObjC::HandleTranslationUnit().
3582Stmt *RewriteModernObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
3583 std::string Name = "_OBJC_PROTOCOL_REFERENCE_$_" +
3584 Exp->getProtocol()->getNameAsString();
3585 IdentifierInfo *ID = &Context->Idents.get(Name);
3586 VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
3587 SourceLocation(), ID, getProtocolType(),
3588 nullptr, SC_Extern);
3589 DeclRefExpr *DRE = new (Context) DeclRefExpr(
3590 *Context, VD, false, getProtocolType(), VK_LValue, SourceLocation());
3591 CastExpr *castExpr = NoTypeInfoCStyleCastExpr(
3592 Context, Context->getPointerType(DRE->getType()), CK_BitCast, DRE);
3593 ReplaceStmt(Exp, castExpr);
3594 ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
3595 // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3596 return castExpr;
3597}
3598
3599/// IsTagDefinedInsideClass - This routine checks that a named tagged type
3600/// is defined inside an objective-c class. If so, it returns true.
3601bool RewriteModernObjC::IsTagDefinedInsideClass(ObjCContainerDecl *IDecl,
3602 TagDecl *Tag,
3603 bool &IsNamedDefinition) {
3604 if (!IDecl)
3605 return false;
3606 SourceLocation TagLocation;
3607 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) {
3608 RD = RD->getDefinition();
3609 if (!RD || !RD->getDeclName().getAsIdentifierInfo())
3610 return false;
3611 IsNamedDefinition = true;
3612 TagLocation = RD->getLocation();
3613 return Context->getSourceManager().isBeforeInTranslationUnit(
3614 IDecl->getLocation(), TagLocation);
3615 }
3616 if (EnumDecl *ED = dyn_cast<EnumDecl>(Tag)) {
3617 if (!ED || !ED->getDeclName().getAsIdentifierInfo())
3618 return false;
3619 IsNamedDefinition = true;
3620 TagLocation = ED->getLocation();
3621 return Context->getSourceManager().isBeforeInTranslationUnit(
3622 IDecl->getLocation(), TagLocation);
3623 }
3624 return false;
3625}
3626
3627/// RewriteObjCFieldDeclType - This routine rewrites a type into the buffer.
3628/// It handles elaborated types, as well as enum types in the process.
3629bool RewriteModernObjC::RewriteObjCFieldDeclType(QualType &Type,
3630 std::string &Result) {
3631 if (isa<TypedefType>(Type)) {
3632 Result += "\t";
3633 return false;
3634 }
3635
3636 if (Type->isArrayType()) {
3637 QualType ElemTy = Context->getBaseElementType(Type);
3638 return RewriteObjCFieldDeclType(ElemTy, Result);
3639 }
3640 else if (Type->isRecordType()) {
3641 RecordDecl *RD = Type->castAs<RecordType>()->getDecl();
3642 if (RD->isCompleteDefinition()) {
3643 if (RD->isStruct())
3644 Result += "\n\tstruct ";
3645 else if (RD->isUnion())
3646 Result += "\n\tunion ";
3647 else
3648 assert(false && "class not allowed as an ivar type")(static_cast<void> (0));
3649
3650 Result += RD->getName();
3651 if (GlobalDefinedTags.count(RD)) {
3652 // struct/union is defined globally, use it.
3653 Result += " ";
3654 return true;
3655 }
3656 Result += " {\n";
3657 for (auto *FD : RD->fields())
3658 RewriteObjCFieldDecl(FD, Result);
3659 Result += "\t} ";
3660 return true;
3661 }
3662 }
3663 else if (Type->isEnumeralType()) {
3664 EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
3665 if (ED->isCompleteDefinition()) {
3666 Result += "\n\tenum ";
3667 Result += ED->getName();
3668 if (GlobalDefinedTags.count(ED)) {
3669 // Enum is globall defined, use it.
3670 Result += " ";
3671 return true;
3672 }
3673
3674 Result += " {\n";
3675 for (const auto *EC : ED->enumerators()) {
3676 Result += "\t"; Result += EC->getName(); Result += " = ";
3677 Result += toString(EC->getInitVal(), 10);
3678 Result += ",\n";
3679 }
3680 Result += "\t} ";
3681 return true;
3682 }
3683 }
3684
3685 Result += "\t";
3686 convertObjCTypeToCStyleType(Type);
3687 return false;
3688}
3689
3690
3691/// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
3692/// It handles elaborated types, as well as enum types in the process.
3693void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
3694 std::string &Result) {
3695 QualType Type = fieldDecl->getType();
3696 std::string Name = fieldDecl->getNameAsString();
3697
3698 bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
3699 if (!EleboratedType)
3700 Type.getAsStringInternal(Name, Context->getPrintingPolicy());
3701 Result += Name;
3702 if (fieldDecl->isBitField()) {
3703 Result += " : "; Result += utostr(fieldDecl->getBitWidthValue(*Context));
3704 }
3705 else if (EleboratedType && Type->isArrayType()) {
3706 const ArrayType *AT = Context->getAsArrayType(Type);
3707 do {
3708 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
3709 Result += "[";
3710 llvm::APInt Dim = CAT->getSize();
3711 Result += utostr(Dim.getZExtValue());
3712 Result += "]";
3713 }
3714 AT = Context->getAsArrayType(AT->getElementType());
3715 } while (AT);
3716 }
3717
3718 Result += ";\n";
3719}
3720
3721/// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
3722/// named aggregate types into the input buffer.
3723void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
3724 std::string &Result) {
3725 QualType Type = fieldDecl->getType();
3726 if (isa<TypedefType>(Type))
3727 return;
3728 if (Type->isArrayType())
3729 Type = Context->getBaseElementType(Type);
3730
3731 auto *IDecl = dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
3732
3733 TagDecl *TD = nullptr;
3734 if (Type->isRecordType()) {
3735 TD = Type->castAs<RecordType>()->getDecl();
3736 }
3737 else if (Type->isEnumeralType()) {
3738 TD = Type->castAs<EnumType>()->getDecl();
3739 }
3740
3741 if (TD) {
3742 if (GlobalDefinedTags.count(TD))
3743 return;
3744
3745 bool IsNamedDefinition = false;
3746 if (IsTagDefinedInsideClass(IDecl, TD, IsNamedDefinition)) {
3747 RewriteObjCFieldDeclType(Type, Result);
3748 Result += ";";
3749 }
3750 if (IsNamedDefinition)
3751 GlobalDefinedTags.insert(TD);
3752 }
3753}
3754
3755unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
3756 const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3757 if (ObjCInterefaceHasBitfieldGroups.count(CDecl)) {
3758 return IvarGroupNumber[IV];
3759 }
3760 unsigned GroupNo = 0;
3761 SmallVector<const ObjCIvarDecl *, 8> IVars;
3762 for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3763 IVD; IVD = IVD->getNextIvar())
3764 IVars.push_back(IVD);
3765
3766 for (unsigned i = 0, e = IVars.size(); i < e; i++)
3767 if (IVars[i]->isBitField()) {
3768 IvarGroupNumber[IVars[i++]] = ++GroupNo;
3769 while (i < e && IVars[i]->isBitField())
3770 IvarGroupNumber[IVars[i++]] = GroupNo;
3771 if (i < e)
3772 --i;
3773 }
3774
3775 ObjCInterefaceHasBitfieldGroups.insert(CDecl);
3776 return IvarGroupNumber[IV];
3777}
3778
3779QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
3780 ObjCIvarDecl *IV,
3781 SmallVectorImpl<ObjCIvarDecl *> &IVars) {
3782 std::string StructTagName;
3783 ObjCIvarBitfieldGroupType(IV, StructTagName);
3784 RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct,
3785 Context->getTranslationUnitDecl(),
3786 SourceLocation(), SourceLocation(),
3787 &Context->Idents.get(StructTagName));
3788 for (unsigned i=0, e = IVars.size(); i < e; i++) {
3789 ObjCIvarDecl *Ivar = IVars[i];
3790 RD->addDecl(FieldDecl::Create(*Context, RD, SourceLocation(), SourceLocation(),
3791 &Context->Idents.get(Ivar->getName()),
3792 Ivar->getType(),
3793 nullptr, /*Expr *BW */Ivar->getBitWidth(),
3794 false, ICIS_NoInit));
3795 }
3796 RD->completeDefinition();
3797 return Context->getTagDeclType(RD);
3798}
3799
3800QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
3801 const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3802 unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3803 std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(CDecl, GroupNo);
3804 if (GroupRecordType.count(tuple))
3805 return GroupRecordType[tuple];
3806
3807 SmallVector<ObjCIvarDecl *, 8> IVars;
3808 for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3809 IVD; IVD = IVD->getNextIvar()) {
3810 if (IVD->isBitField())
3811 IVars.push_back(const_cast<ObjCIvarDecl *>(IVD));
3812 else {
3813 if (!IVars.empty()) {
3814 unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3815 // Generate the struct type for this group of bitfield ivars.
3816 GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3817 SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3818 IVars.clear();
3819 }
3820 }
3821 }
3822 if (!IVars.empty()) {
3823 // Do the last one.
3824 unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3825 GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3826 SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3827 }
3828 QualType RetQT = GroupRecordType[tuple];
3829 assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL")(static_cast<void> (0));
3830
3831 return RetQT;
3832}
3833
3834/// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
3835/// Name would be: classname__GRBF_n where n is the group number for this ivar.
3836void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
3837 std::string &Result) {
3838 const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3839 Result += CDecl->getName();
3840 Result += "__GRBF_";
3841 unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3842 Result += utostr(GroupNo);
3843}
3844
3845/// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
3846/// Name of the struct would be: classname__T_n where n is the group number for
3847/// this ivar.
3848void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
3849 std::string &Result) {
3850 const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3851 Result += CDecl->getName();
3852 Result += "__T_";
3853 unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3854 Result += utostr(GroupNo);
3855}
3856
3857/// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
3858/// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
3859/// this ivar.
3860void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
3861 std::string &Result) {
3862 Result += "OBJC_IVAR_$_";
3863 ObjCIvarBitfieldGroupDecl(IV, Result);
3864}
3865
3866#define SKIP_BITFIELDS(IX, ENDIX, VEC){ while ((IX < ENDIX) && VEC[IX]->isBitField())
++IX; if (IX < ENDIX) --IX; }
{ \
3867 while ((IX < ENDIX) && VEC[IX]->isBitField()) \
3868 ++IX; \
3869 if (IX < ENDIX) \
3870 --IX; \
3871}
3872
3873/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
3874/// an objective-c class with ivars.
3875void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
3876 std::string &Result) {
3877 assert(CDecl && "Class missing in SynthesizeObjCInternalStruct")(static_cast<void> (0));
3878 assert(CDecl->getName() != "" &&(static_cast<void> (0))
3879 "Name missing in SynthesizeObjCInternalStruct")(static_cast<void> (0));
3880 ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
3881 SmallVector<ObjCIvarDecl *, 8> IVars;
3882 for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3883 IVD; IVD = IVD->getNextIvar())
3884 IVars.push_back(IVD);
3885
3886 SourceLocation LocStart = CDecl->getBeginLoc();
3887 SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
3888
3889 const char *startBuf = SM->getCharacterData(LocStart);
3890 const char *endBuf = SM->getCharacterData(LocEnd);
3891
3892 // If no ivars and no root or if its root, directly or indirectly,
3893 // have no ivars (thus not synthesized) then no need to synthesize this class.
3894 if ((!CDecl->isThisDeclarationADefinition() || IVars.size() == 0) &&
3895 (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
3896 endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3897 ReplaceText(LocStart, endBuf-startBuf, Result);
3898 return;
3899 }
3900
3901 // Insert named struct/union definitions inside class to
3902 // outer scope. This follows semantics of locally defined
3903 // struct/unions in objective-c classes.
3904 for (unsigned i = 0, e = IVars.size(); i < e; i++)
3905 RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
3906
3907 // Insert named structs which are syntheized to group ivar bitfields
3908 // to outer scope as well.
3909 for (unsigned i = 0, e = IVars.size(); i < e; i++)
3910 if (IVars[i]->isBitField()) {
3911 ObjCIvarDecl *IV = IVars[i];
3912 QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
3913 RewriteObjCFieldDeclType(QT, Result);
3914 Result += ";";
3915 // skip over ivar bitfields in this group.
3916 SKIP_BITFIELDS(i , e, IVars){ while ((i < e) && IVars[i]->isBitField()) ++i
; if (i < e) --i; }
;
3917 }
3918
3919 Result += "\nstruct ";
3920 Result += CDecl->getNameAsString();
3921 Result += "_IMPL {\n";
3922
3923 if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
3924 Result += "\tstruct "; Result += RCDecl->getNameAsString();
3925 Result += "_IMPL "; Result += RCDecl->getNameAsString();
3926 Result += "_IVARS;\n";
3927 }
3928
3929 for (unsigned i = 0, e = IVars.size(); i < e; i++) {
3930 if (IVars[i]->isBitField()) {
3931 ObjCIvarDecl *IV = IVars[i];
3932 Result += "\tstruct ";
3933 ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
3934 ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
3935 // skip over ivar bitfields in this group.
3936 SKIP_BITFIELDS(i , e, IVars){ while ((i < e) && IVars[i]->isBitField()) ++i
; if (i < e) --i; }
;
3937 }
3938 else
3939 RewriteObjCFieldDecl(IVars[i], Result);
3940 }
3941
3942 Result += "};\n";
3943 endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3944 ReplaceText(LocStart, endBuf-startBuf, Result);
3945 // Mark this struct as having been generated.
3946 if (!ObjCSynthesizedStructs.insert(CDecl).second)
3947 llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct")__builtin_unreachable();
3948}
3949
3950/// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
3951/// have been referenced in an ivar access expression.
3952void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
3953 std::string &Result) {
3954 // write out ivar offset symbols which have been referenced in an ivar
3955 // access expression.
3956 llvm::SmallSetVector<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
3957
3958 if (Ivars.empty())
3959 return;
3960
3961 llvm::DenseSet<std::pair<const ObjCInterfaceDecl*, unsigned> > GroupSymbolOutput;
3962 for (ObjCIvarDecl *IvarDecl : Ivars) {
3963 const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
3964 unsigned GroupNo = 0;
3965 if (IvarDecl->isBitField()) {
3966 GroupNo = ObjCIvarBitfieldGroupNo(IvarDecl);
3967 if (GroupSymbolOutput.count(std::make_pair(IDecl, GroupNo)))
3968 continue;
3969 }
3970 Result += "\n";
3971 if (LangOpts.MicrosoftExt)
3972 Result += "__declspec(allocate(\".objc_ivar$B\")) ";
3973 Result += "extern \"C\" ";
3974 if (LangOpts.MicrosoftExt &&
3975 IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
3976 IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
3977 Result += "__declspec(dllimport) ";
3978
3979 Result += "unsigned long ";
3980 if (IvarDecl->isBitField()) {
3981 ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
3982 GroupSymbolOutput.insert(std::make_pair(IDecl, GroupNo));
3983 }
3984 else
3985 WriteInternalIvarName(CDecl, IvarDecl, Result);
3986 Result += ";";
3987 }
3988}
3989
3990//===----------------------------------------------------------------------===//
3991// Meta Data Emission
3992//===----------------------------------------------------------------------===//
3993
3994/// RewriteImplementations - This routine rewrites all method implementations
3995/// and emits meta-data.
3996
3997void RewriteModernObjC::RewriteImplementations() {
3998 int ClsDefCount = ClassImplementation.size();
3999 int CatDefCount = CategoryImplementation.size();
4000
4001 // Rewrite implemented methods
4002 for (int i = 0; i < ClsDefCount; i++) {
9
Loop condition is false. Execution continues on line 4011
4003 ObjCImplementationDecl *OIMP = ClassImplementation[i];
4004 ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
4005 if (CDecl->isImplicitInterfaceDecl())
4006 assert(false &&(static_cast<void> (0))
4007 "Legacy implicit interface rewriting not supported in moder abi")(static_cast<void> (0));
4008 RewriteImplementationDecl(OIMP);
4009 }
4010
4011 for (int i = 0; i
9.1
'i' is < 'CatDefCount'
< CatDefCount; i++) {
10
Loop condition is true. Entering loop body
4012 ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
4013 ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
4014 if (CDecl->isImplicitInterfaceDecl())
11
Assuming the condition is false
12
Taking false branch
4015 assert(false &&(static_cast<void> (0))
4016 "Legacy implicit interface rewriting not supported in moder abi")(static_cast<void> (0));
4017 RewriteImplementationDecl(CIMP);
13
Calling 'RewriteModernObjC::RewriteImplementationDecl'
4018 }
4019}
4020
4021void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
4022 const std::string &Name,
4023 ValueDecl *VD, bool def) {
4024 assert(BlockByRefDeclNo.count(VD) &&(static_cast<void> (0))
4025 "RewriteByRefString: ByRef decl missing")(static_cast<void> (0));
4026 if (def)
4027 ResultStr += "struct ";
4028 ResultStr += "__Block_byref_" + Name +
4029 "_" + utostr(BlockByRefDeclNo[VD]) ;
4030}
4031
4032static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
4033 if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4034 return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
4035 return false;
4036}
4037
4038std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
4039 StringRef funcName,
4040 std::string Tag) {
4041 const FunctionType *AFT = CE->getFunctionType();
4042 QualType RT = AFT->getReturnType();
4043 std::string StructRef = "struct " + Tag;
4044 SourceLocation BlockLoc = CE->getExprLoc();
4045 std::string S;
4046 ConvertSourceLocationToLineDirective(BlockLoc, S);
4047
4048 S += "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
4049 funcName.str() + "_block_func_" + utostr(i);
4050
4051 BlockDecl *BD = CE->getBlockDecl();
4052
4053 if (isa<FunctionNoProtoType>(AFT)) {
4054 // No user-supplied arguments. Still need to pass in a pointer to the
4055 // block (to reference imported block decl refs).
4056 S += "(" + StructRef + " *__cself)";
4057 } else if (BD->param_empty()) {
4058 S += "(" + StructRef + " *__cself)";
4059 } else {
4060 const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
4061 assert(FT && "SynthesizeBlockFunc: No function proto")(static_cast<void> (0));
4062 S += '(';
4063 // first add the implicit argument.
4064 S += StructRef + " *__cself, ";
4065 std::string ParamStr;
4066 for (BlockDecl::param_iterator AI = BD->param_begin(),
4067 E = BD->param_end(); AI != E; ++AI) {
4068 if (AI != BD->param_begin()) S += ", ";
4069 ParamStr = (*AI)->getNameAsString();
4070 QualType QT = (*AI)->getType();
4071 (void)convertBlockPointerToFunctionPointer(QT);
4072 QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
4073 S += ParamStr;
4074 }
4075 if (FT->isVariadic()) {
4076 if (!BD->param_empty()) S += ", ";
4077 S += "...";
4078 }
4079 S += ')';
4080 }
4081 S += " {\n";
4082
4083 // Create local declarations to avoid rewriting all closure decl ref exprs.
4084 // First, emit a declaration for all "by ref" decls.
4085 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4086 E = BlockByRefDecls.end(); I != E; ++I) {
4087 S += " ";
4088 std::string Name = (*I)->getNameAsString();
4089 std::string TypeString;
4090 RewriteByRefString(TypeString, Name, (*I));
4091 TypeString += " *";
4092 Name = TypeString + Name;
4093 S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
4094 }
4095 // Next, emit a declaration for all "by copy" declarations.
4096 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4097 E = BlockByCopyDecls.end(); I != E; ++I) {
4098 S += " ";
4099 // Handle nested closure invocation. For example:
4100 //
4101 // void (^myImportedClosure)(void);
4102 // myImportedClosure = ^(void) { setGlobalInt(x + y); };
4103 //
4104 // void (^anotherClosure)(void);
4105 // anotherClosure = ^(void) {
4106 // myImportedClosure(); // import and invoke the closure
4107 // };
4108 //
4109 if (isTopLevelBlockPointerType((*I)->getType())) {
4110 RewriteBlockPointerTypeVariable(S, (*I));
4111 S += " = (";
4112 RewriteBlockPointerType(S, (*I)->getType());
4113 S += ")";
4114 S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
4115 }
4116 else {
4117 std::string Name = (*I)->getNameAsString();
4118 QualType QT = (*I)->getType();
4119 if (HasLocalVariableExternalStorage(*I))
4120 QT = Context->getPointerType(QT);
4121 QT.getAsStringInternal(Name, Context->getPrintingPolicy());
4122 S += Name + " = __cself->" +
4123 (*I)->getNameAsString() + "; // bound by copy\n";
4124 }
4125 }
4126 std::string RewrittenStr = RewrittenBlockExprs[CE];
4127 const char *cstr = RewrittenStr.c_str();
4128 while (*cstr++ != '{') ;
4129 S += cstr;
4130 S += "\n";
4131 return S;
4132}
4133
4134std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
4135 StringRef funcName,
4136 std::string Tag) {
4137 std::string StructRef = "struct " + Tag;
4138 std::string S = "static void __";
4139
4140 S += funcName;
4141 S += "_block_copy_" + utostr(i);
4142 S += "(" + StructRef;
4143 S += "*dst, " + StructRef;
4144 S += "*src) {";
4145 for (ValueDecl *VD : ImportedBlockDecls) {
4146 S += "_Block_object_assign((void*)&dst->";
4147 S += VD->getNameAsString();
4148 S += ", (void*)src->";
4149 S += VD->getNameAsString();
4150 if (BlockByRefDeclsPtrSet.count(VD))
4151 S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4152 else if (VD->getType()->isBlockPointerType())
4153 S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4154 else
4155 S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4156 }
4157 S += "}\n";
4158
4159 S += "\nstatic void __";
4160 S += funcName;
4161 S += "_block_dispose_" + utostr(i);
4162 S += "(" + StructRef;
4163 S += "*src) {";
4164 for (ValueDecl *VD : ImportedBlockDecls) {
4165 S += "_Block_object_dispose((void*)src->";
4166 S += VD->getNameAsString();
4167 if (BlockByRefDeclsPtrSet.count(VD))
4168 S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4169 else if (VD->getType()->isBlockPointerType())
4170 S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4171 else
4172 S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4173 }
4174 S += "}\n";
4175 return S;
4176}
4177
4178std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
4179 std::string Desc) {
4180 std::string S = "\nstruct " + Tag;
4181 std::string Constructor = " " + Tag;
4182
4183 S += " {\n struct __block_impl impl;\n";
4184 S += " struct " + Desc;
4185 S += "* Desc;\n";
4186
4187 Constructor += "(void *fp, "; // Invoke function pointer.
4188 Constructor += "struct " + Desc; // Descriptor pointer.
4189 Constructor += " *desc";
4190
4191 if (BlockDeclRefs.size()) {
4192 // Output all "by copy" declarations.
4193 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4194 E = BlockByCopyDecls.end(); I != E; ++I) {
4195 S += " ";
4196 std::string FieldName = (*I)->getNameAsString();
4197 std::string ArgName = "_" + FieldName;
4198 // Handle nested closure invocation. For example:
4199 //
4200 // void (^myImportedBlock)(void);
4201 // myImportedBlock = ^(void) { setGlobalInt(x + y); };
4202 //
4203 // void (^anotherBlock)(void);
4204 // anotherBlock = ^(void) {
4205 // myImportedBlock(); // import and invoke the closure
4206 // };
4207 //
4208 if (isTopLevelBlockPointerType((*I)->getType())) {
4209 S += "struct __block_impl *";
4210 Constructor += ", void *" + ArgName;
4211 } else {
4212 QualType QT = (*I)->getType();
4213 if (HasLocalVariableExternalStorage(*I))
4214 QT = Context->getPointerType(QT);
4215 QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
4216 QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
4217 Constructor += ", " + ArgName;
4218 }
4219 S += FieldName + ";\n";
4220 }
4221 // Output all "by ref" declarations.
4222 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4223 E = BlockByRefDecls.end(); I != E; ++I) {
4224 S += " ";
4225 std::string FieldName = (*I)->getNameAsString();
4226 std::string ArgName = "_" + FieldName;
4227 {
4228 std::string TypeString;
4229 RewriteByRefString(TypeString, FieldName, (*I));
4230 TypeString += " *";
4231 FieldName = TypeString + FieldName;
4232 ArgName = TypeString + ArgName;
4233 Constructor += ", " + ArgName;
4234 }
4235 S += FieldName + "; // by ref\n";
4236 }
4237 // Finish writing the constructor.
4238 Constructor += ", int flags=0)";
4239 // Initialize all "by copy" arguments.
4240 bool firsTime = true;
4241 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4242 E = BlockByCopyDecls.end(); I != E; ++I) {
4243 std::string Name = (*I)->getNameAsString();
4244 if (firsTime) {
4245 Constructor += " : ";
4246 firsTime = false;
4247 }
4248 else
4249 Constructor += ", ";
4250 if (isTopLevelBlockPointerType((*I)->getType()))
4251 Constructor += Name + "((struct __block_impl *)_" + Name + ")";
4252 else
4253 Constructor += Name + "(_" + Name + ")";
4254 }
4255 // Initialize all "by ref" arguments.
4256 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4257 E = BlockByRefDecls.end(); I != E; ++I) {
4258 std::string Name = (*I)->getNameAsString();
4259 if (firsTime) {
4260 Constructor += " : ";
4261 firsTime = false;
4262 }
4263 else
4264 Constructor += ", ";
4265 Constructor += Name + "(_" + Name + "->__forwarding)";
4266 }
4267
4268 Constructor += " {\n";
4269 if (GlobalVarDecl)
4270 Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4271 else
4272 Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4273 Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4274
4275 Constructor += " Desc = desc;\n";
4276 } else {
4277 // Finish writing the constructor.
4278 Constructor += ", int flags=0) {\n";
4279 if (GlobalVarDecl)
4280 Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4281 else
4282 Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4283 Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4284 Constructor += " Desc = desc;\n";
4285 }
4286 Constructor += " ";
4287 Constructor += "}\n";
4288 S += Constructor;
4289 S += "};\n";
4290 return S;
4291}
4292
4293std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
4294 std::string ImplTag, int i,
4295 StringRef FunName,
4296 unsigned hasCopy) {
4297 std::string S = "\nstatic struct " + DescTag;
4298
4299 S += " {\n size_t reserved;\n";
4300 S += " size_t Block_size;\n";
4301 if (hasCopy) {
4302 S += " void (*copy)(struct ";
4303 S += ImplTag; S += "*, struct ";
4304 S += ImplTag; S += "*);\n";
4305
4306 S += " void (*dispose)(struct ";
4307 S += ImplTag; S += "*);\n";
4308 }
4309 S += "} ";
4310
4311 S += DescTag + "_DATA = { 0, sizeof(struct ";
4312 S += ImplTag + ")";
4313 if (hasCopy) {
4314 S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
4315 S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
4316 }
4317 S += "};\n";
4318 return S;
4319}
4320
4321void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
4322 StringRef FunName) {
4323 bool RewriteSC = (GlobalVarDecl &&
4324 !Blocks.empty() &&
4325 GlobalVarDecl->getStorageClass() == SC_Static &&
4326 GlobalVarDecl->getType().getCVRQualifiers());
4327 if (RewriteSC) {
4328 std::string SC(" void __");
4329 SC += GlobalVarDecl->getNameAsString();
4330 SC += "() {}";
4331 InsertText(FunLocStart, SC);
4332 }
4333
4334 // Insert closures that were part of the function.
4335 for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
4336 CollectBlockDeclRefInfo(Blocks[i]);
4337 // Need to copy-in the inner copied-in variables not actually used in this
4338 // block.
4339 for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
4340 DeclRefExpr *Exp = InnerDeclRefs[count++];
4341 ValueDecl *VD = Exp->getDecl();
4342 BlockDeclRefs.push_back(Exp);
4343 if (!VD->hasAttr<BlocksAttr>()) {
4344 if (!BlockByCopyDeclsPtrSet.count(VD)) {
4345 BlockByCopyDeclsPtrSet.insert(VD);
4346 BlockByCopyDecls.push_back(VD);
4347 }
4348 continue;
4349 }
4350
4351 if (!BlockByRefDeclsPtrSet.count(VD)) {
4352 BlockByRefDeclsPtrSet.insert(VD);
4353 BlockByRefDecls.push_back(VD);
4354 }
4355
4356 // imported objects in the inner blocks not used in the outer
4357 // blocks must be copied/disposed in the outer block as well.
4358 if (VD->getType()->isObjCObjectPointerType() ||
4359 VD->getType()->isBlockPointerType())
4360 ImportedBlockDecls.insert(VD);
4361 }
4362
4363 std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
4364 std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
4365
4366 std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
4367
4368 InsertText(FunLocStart, CI);
4369
4370 std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
4371
4372 InsertText(FunLocStart, CF);
4373
4374 if (ImportedBlockDecls.size()) {
4375 std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
4376 InsertText(FunLocStart, HF);
4377 }
4378 std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
4379 ImportedBlockDecls.size() > 0);
4380 InsertText(FunLocStart, BD);
4381
4382 BlockDeclRefs.clear();
4383 BlockByRefDecls.clear();
4384 BlockByRefDeclsPtrSet.clear();
4385 BlockByCopyDecls.clear();
4386 BlockByCopyDeclsPtrSet.clear();
4387 ImportedBlockDecls.clear();
4388 }
4389 if (RewriteSC) {
4390 // Must insert any 'const/volatile/static here. Since it has been
4391 // removed as result of rewriting of block literals.
4392 std::string SC;
4393 if (GlobalVarDecl->getStorageClass() == SC_Static)
4394 SC = "static ";
4395 if (GlobalVarDecl->getType().isConstQualified())
4396 SC += "const ";
4397 if (GlobalVarDecl->getType().isVolatileQualified())
4398 SC += "volatile ";
4399 if (GlobalVarDecl->getType().isRestrictQualified())
4400 SC += "restrict ";
4401 InsertText(FunLocStart, SC);
4402 }
4403 if (GlobalConstructionExp) {
4404 // extra fancy dance for global literal expression.
4405
4406 // Always the latest block expression on the block stack.
4407 std::string Tag = "__";
4408 Tag += FunName;
4409 Tag += "_block_impl_";
4410 Tag += utostr(Blocks.size()-1);
4411 std::string globalBuf = "static ";
4412 globalBuf += Tag; globalBuf += " ";
4413 std::string SStr;
4414
4415 llvm::raw_string_ostream constructorExprBuf(SStr);
4416 GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
4417 PrintingPolicy(LangOpts));
4418 globalBuf += constructorExprBuf.str();
4419 globalBuf += ";\n";
4420 InsertText(FunLocStart, globalBuf);
4421 GlobalConstructionExp = nullptr;
4422 }
4423
4424 Blocks.clear();
4425 InnerDeclRefsCount.clear();
4426 InnerDeclRefs.clear();
4427 RewrittenBlockExprs.clear();
4428}
4429
4430void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
4431 SourceLocation FunLocStart =
4432 (!Blocks.empty()) ? getFunctionSourceLocation(*this, FD)
4433 : FD->getTypeSpecStartLoc();
4434 StringRef FuncName = FD->getName();
4435
4436 SynthesizeBlockLiterals(FunLocStart, FuncName);
4437}
4438
4439static void BuildUniqueMethodName(std::string &Name,
4440 ObjCMethodDecl *MD) {
4441 ObjCInterfaceDecl *IFace = MD->getClassInterface();
4442 Name = std::string(IFace->getName());
4443 Name += "__" + MD->getSelector().getAsString();
4444 // Convert colons to underscores.
4445 std::string::size_type loc = 0;
4446 while ((loc = Name.find(':', loc)) != std::string::npos)
4447 Name.replace(loc, 1, "_");
4448}
4449
4450void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
4451 // fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
4452 // SourceLocation FunLocStart = MD->getBeginLoc();
4453 SourceLocation FunLocStart = MD->getBeginLoc();
4454 std::string FuncName;
4455 BuildUniqueMethodName(FuncName, MD);
4456 SynthesizeBlockLiterals(FunLocStart, FuncName);
4457}
4458
4459void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
4460 for (Stmt *SubStmt : S->children())
4461 if (SubStmt) {
4462 if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt))
4463 GetBlockDeclRefExprs(CBE->getBody());
4464 else
4465 GetBlockDeclRefExprs(SubStmt);
4466 }
4467 // Handle specific things.
4468 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
4469 if (DRE->refersToEnclosingVariableOrCapture() ||
4470 HasLocalVariableExternalStorage(DRE->getDecl()))
4471 // FIXME: Handle enums.
4472 BlockDeclRefs.push_back(DRE);
4473}
4474
4475void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
4476 SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
4477 llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
4478 for (Stmt *SubStmt : S->children())
4479 if (SubStmt) {
4480 if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt)) {
4481 InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
4482 GetInnerBlockDeclRefExprs(CBE->getBody(),
4483 InnerBlockDeclRefs,
4484 InnerContexts);
4485 }
4486 else
4487 GetInnerBlockDeclRefExprs(SubStmt, InnerBlockDeclRefs, InnerContexts);
4488 }
4489 // Handle specific things.
4490 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
4491 if (DRE->refersToEnclosingVariableOrCapture() ||
4492 HasLocalVariableExternalStorage(DRE->getDecl())) {
4493 if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
4494 InnerBlockDeclRefs.push_back(DRE);
4495 if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
4496 if (Var->isFunctionOrMethodVarDecl())
4497 ImportedLocalExternalDecls.insert(Var);
4498 }
4499 }
4500}
4501
4502/// convertObjCTypeToCStyleType - This routine converts such objc types
4503/// as qualified objects, and blocks to their closest c/c++ types that
4504/// it can. It returns true if input type was modified.
4505bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
4506 QualType oldT = T;
4507 convertBlockPointerToFunctionPointer(T);
4508 if (T->isFunctionPointerType()) {
4509 QualType PointeeTy;
4510 if (const PointerType* PT = T->getAs<PointerType>()) {
4511 PointeeTy = PT->getPointeeType();
4512 if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
4513 T = convertFunctionTypeOfBlocks(FT);
4514 T = Context->getPointerType(T);
4515 }
4516 }
4517 }
4518
4519 convertToUnqualifiedObjCType(T);
4520 return T != oldT;
4521}
4522
4523/// convertFunctionTypeOfBlocks - This routine converts a function type
4524/// whose result type may be a block pointer or whose argument type(s)
4525/// might be block pointers to an equivalent function type replacing
4526/// all block pointers to function pointers.
4527QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
4528 const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4529 // FTP will be null for closures that don't take arguments.
4530 // Generate a funky cast.
4531 SmallVector<QualType, 8> ArgTypes;
4532 QualType Res = FT->getReturnType();
4533 bool modified = convertObjCTypeToCStyleType(Res);
4534
4535 if (FTP) {
4536 for (auto &I : FTP->param_types()) {
4537 QualType t = I;
4538 // Make sure we convert "t (^)(...)" to "t (*)(...)".
4539 if (convertObjCTypeToCStyleType(t))
4540 modified = true;
4541 ArgTypes.push_back(t);
4542 }
4543 }
4544 QualType FuncType;
4545 if (modified)
4546 FuncType = getSimpleFunctionType(Res, ArgTypes);
4547 else FuncType = QualType(FT, 0);
4548 return FuncType;
4549}
4550
4551Stmt *RewriteModernObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
4552 // Navigate to relevant type information.
4553 const BlockPointerType *CPT = nullptr;
4554
4555 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
4556 CPT = DRE->getType()->getAs<BlockPointerType>();
4557 } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
4558 CPT = MExpr->getType()->getAs<BlockPointerType>();
4559 }
4560 else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
4561 return SynthesizeBlockCall(Exp, PRE->getSubExpr());
4562 }
4563 else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
4564 CPT = IEXPR->getType()->getAs<BlockPointerType>();
4565 else if (const ConditionalOperator *CEXPR =
4566 dyn_cast<ConditionalOperator>(BlockExp)) {
4567 Expr *LHSExp = CEXPR->getLHS();
4568 Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
4569 Expr *RHSExp = CEXPR->getRHS();
4570 Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
4571 Expr *CONDExp = CEXPR->getCond();
4572 ConditionalOperator *CondExpr = new (Context) ConditionalOperator(
4573 CONDExp, SourceLocation(), cast<Expr>(LHSStmt), SourceLocation(),
4574 cast<Expr>(RHSStmt), Exp->getType(), VK_PRValue, OK_Ordinary);
4575 return CondExpr;
4576 } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
4577 CPT = IRE->getType()->getAs<BlockPointerType>();
4578 } else if (const PseudoObjectExpr *POE
4579 = dyn_cast<PseudoObjectExpr>(BlockExp)) {
4580 CPT = POE->getType()->castAs<BlockPointerType>();
4581 } else {
4582 assert(false && "RewriteBlockClass: Bad type")(static_cast<void> (0));
4583 }
4584 assert(CPT && "RewriteBlockClass: Bad type")(static_cast<void> (0));
4585 const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
4586 assert(FT && "RewriteBlockClass: Bad type")(static_cast<void> (0));
4587 const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4588 // FTP will be null for closures that don't take arguments.
4589
4590 RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
4591 SourceLocation(), SourceLocation(),
4592 &Context->Idents.get("__block_impl"));
4593 QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
4594
4595 // Generate a funky cast.
4596 SmallVector<QualType, 8> ArgTypes;
4597
4598 // Push the block argument type.
4599 ArgTypes.push_back(PtrBlock);
4600 if (FTP) {
4601 for (auto &I : FTP->param_types()) {
4602 QualType t = I;
4603 // Make sure we convert "t (^)(...)" to "t (*)(...)".
4604 if (!convertBlockPointerToFunctionPointer(t))
4605 convertToUnqualifiedObjCType(t);
4606 ArgTypes.push_back(t);
4607 }
4608 }
4609 // Now do the pointer to function cast.
4610 QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
4611
4612 PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
4613
4614 CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
4615 CK_BitCast,
4616 const_cast<Expr*>(BlockExp));
4617 // Don't forget the parens to enforce the proper binding.
4618 ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4619 BlkCast);
4620 //PE->dump();
4621
4622 FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4623 SourceLocation(),
4624 &Context->Idents.get("FuncPtr"),
4625 Context->VoidPtrTy, nullptr,
4626 /*BitWidth=*/nullptr, /*Mutable=*/true,
4627 ICIS_NoInit);
4628 MemberExpr *ME = MemberExpr::CreateImplicit(
4629 *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
4630
4631 CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
4632 CK_BitCast, ME);
4633 PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
4634
4635 SmallVector<Expr*, 8> BlkExprs;
4636 // Add the implicit argument.
4637 BlkExprs.push_back(BlkCast);
4638 // Add the user arguments.
4639 for (CallExpr::arg_iterator I = Exp->arg_begin(),
4640 E = Exp->arg_end(); I != E; ++I) {
4641 BlkExprs.push_back(*I);
4642 }
4643 CallExpr *CE =
4644 CallExpr::Create(*Context, PE, BlkExprs, Exp->getType(), VK_PRValue,
4645 SourceLocation(), FPOptionsOverride());
4646 return CE;
4647}
4648
4649// We need to return the rewritten expression to handle cases where the
4650// DeclRefExpr is embedded in another expression being rewritten.
4651// For example:
4652//
4653// int main() {
4654// __block Foo *f;
4655// __block int i;
4656//
4657// void (^myblock)() = ^() {
4658// [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
4659// i = 77;
4660// };
4661//}
4662Stmt *RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
4663 // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
4664 // for each DeclRefExp where BYREFVAR is name of the variable.
4665 ValueDecl *VD = DeclRefExp->getDecl();
4666 bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
4667 HasLocalVariableExternalStorage(DeclRefExp->getDecl());
4668
4669 FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4670 SourceLocation(),
4671 &Context->Idents.get("__forwarding"),
4672 Context->VoidPtrTy, nullptr,
4673 /*BitWidth=*/nullptr, /*Mutable=*/true,
4674 ICIS_NoInit);
4675 MemberExpr *ME = MemberExpr::CreateImplicit(
4676 *Context, DeclRefExp, isArrow, FD, FD->getType(), VK_LValue, OK_Ordinary);
4677
4678 StringRef Name = VD->getName();
4679 FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
4680 &Context->Idents.get(Name),
4681 Context->VoidPtrTy, nullptr,
4682 /*BitWidth=*/nullptr, /*Mutable=*/true,
4683 ICIS_NoInit);
4684 ME = MemberExpr::CreateImplicit(*Context, ME, true, FD, DeclRefExp->getType(),
4685 VK_LValue, OK_Ordinary);
4686
4687 // Need parens to enforce precedence.
4688 ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
4689 DeclRefExp->getExprLoc(),
4690 ME);
4691 ReplaceStmt(DeclRefExp, PE);
4692 return PE;
4693}
4694
4695// Rewrites the imported local variable V with external storage
4696// (static, extern, etc.) as *V
4697//
4698Stmt *RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
4699 ValueDecl *VD = DRE->getDecl();
4700 if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4701 if (!ImportedLocalExternalDecls.count(Var))
4702 return DRE;
4703 Expr *Exp = UnaryOperator::Create(
4704 const_cast<ASTContext &>(*Context), DRE, UO_Deref, DRE->getType(),
4705 VK_LValue, OK_Ordinary, DRE->getLocation(), false, FPOptionsOverride());
4706 // Need parens to enforce precedence.
4707 ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4708 Exp);
4709 ReplaceStmt(DRE, PE);
4710 return PE;
4711}
4712
4713void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
4714 SourceLocation LocStart = CE->getLParenLoc();
4715 SourceLocation LocEnd = CE->getRParenLoc();
4716
4717 // Need to avoid trying to rewrite synthesized casts.
4718 if (LocStart.isInvalid())
4719 return;
4720 // Need to avoid trying to rewrite casts contained in macros.
4721 if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
4722 return;
4723
4724 const char *startBuf = SM->getCharacterData(LocStart);
4725 const char *endBuf = SM->getCharacterData(LocEnd);
4726 QualType QT = CE->getType();
4727 const Type* TypePtr = QT->getAs<Type>();
4728 if (isa<TypeOfExprType>(TypePtr)) {
4729 const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
4730 QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
4731 std::string TypeAsString = "(";
4732 RewriteBlockPointerType(TypeAsString, QT);
4733 TypeAsString += ")";
4734 ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
4735 return;
4736 }
4737 // advance the location to startArgList.
4738 const char *argPtr = startBuf;
4739
4740 while (*argPtr++ && (argPtr < endBuf)) {
4741 switch (*argPtr) {
4742 case '^':
4743 // Replace the '^' with '*'.
4744 LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
4745 ReplaceText(LocStart, 1, "*");
4746 break;
4747 }
4748 }
4749}
4750
4751void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
4752 CastKind CastKind = IC->getCastKind();
4753 if (CastKind != CK_BlockPointerToObjCPointerCast &&
4754 CastKind != CK_AnyPointerToBlockPointerCast)
4755 return;
4756
4757 QualType QT = IC->getType();
4758 (void)convertBlockPointerToFunctionPointer(QT);
4759 std::string TypeString(QT.getAsString(Context->getPrintingPolicy()));
4760 std::string Str = "(";
4761 Str += TypeString;
4762 Str += ")";
4763 InsertText(IC->getSubExpr()->getBeginLoc(), Str);
4764}
4765
4766void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
4767 SourceLocation DeclLoc = FD->getLocation();
4768 unsigned parenCount = 0;
4769
4770 // We have 1 or more arguments that have closure pointers.
4771 const char *startBuf = SM->getCharacterData(DeclLoc);
4772 const char *startArgList = strchr(startBuf, '(');
4773
4774 assert((*startArgList == '(') && "Rewriter fuzzy parser confused")(static_cast<void> (0));
4775
4776 parenCount++;
4777 // advance the location to startArgList.
4778 DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
4779 assert((DeclLoc.isValid()) && "Invalid DeclLoc")(static_cast<void> (0));
4780
4781 const char *argPtr = startArgList;
4782
4783 while (*argPtr++ && parenCount) {
4784 switch (*argPtr) {
4785 case '^':
4786 // Replace the '^' with '*'.
4787 DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
4788 ReplaceText(DeclLoc, 1, "*");
4789 break;
4790 case '(':
4791 parenCount++;
4792 break;
4793 case ')':
4794 parenCount--;
4795 break;
4796 }
4797 }
4798}
4799
4800bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
4801 const FunctionProtoType *FTP;
4802 const PointerType *PT = QT->getAs<PointerType>();
4803 if (PT) {
4804 FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4805 } else {
4806 const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4807 assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type")(static_cast<void> (0));
4808 FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4809 }
4810 if (FTP) {
4811 for (const auto &I : FTP->param_types())
4812 if (isTopLevelBlockPointerType(I))
4813 return true;
4814 }
4815 return false;
4816}
4817
4818bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
4819 const FunctionProtoType *FTP;
4820 const PointerType *PT = QT->getAs<PointerType>();
4821 if (PT) {
4822 FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4823 } else {
4824 const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4825 assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type")(static_cast<void> (0));
4826 FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4827 }
4828 if (FTP) {
4829 for (const auto &I : FTP->param_types()) {
4830 if (I->isObjCQualifiedIdType())
4831 return true;
4832 if (I->isObjCObjectPointerType() &&
4833 I->getPointeeType()->isObjCQualifiedInterfaceType())
4834 return true;
4835 }
4836
4837 }
4838 return false;
4839}
4840
4841void RewriteModernObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
4842 const char *&RParen) {
4843 const char *argPtr = strchr(Name, '(');
4844 assert((*argPtr == '(') && "Rewriter fuzzy parser confused")(static_cast<void> (0));
4845
4846 LParen = argPtr; // output the start.
4847 argPtr++; // skip past the left paren.
4848 unsigned parenCount = 1;
4849
4850 while (*argPtr && parenCount) {
4851 switch (*argPtr) {
4852 case '(': parenCount++; break;
4853 case ')': parenCount--; break;
4854 default: break;
4855 }
4856 if (parenCount) argPtr++;
4857 }
4858 assert((*argPtr == ')') && "Rewriter fuzzy parser confused")(static_cast<void> (0));
4859 RParen = argPtr; // output the end
4860}
4861
4862void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
4863 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
4864 RewriteBlockPointerFunctionArgs(FD);
4865 return;
4866 }
4867 // Handle Variables and Typedefs.
4868 SourceLocation DeclLoc = ND->getLocation();
4869 QualType DeclT;
4870 if (VarDecl *VD = dyn_cast<VarDecl>(ND))
4871 DeclT = VD->getType();
4872 else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
4873 DeclT = TDD->getUnderlyingType();
4874 else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
4875 DeclT = FD->getType();
4876 else
4877 llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled")__builtin_unreachable();
4878
4879 const char *startBuf = SM->getCharacterData(DeclLoc);
4880 const char *endBuf = startBuf;
4881 // scan backward (from the decl location) for the end of the previous decl.
4882 while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
4883 startBuf--;
4884 SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
4885 std::string buf;
4886 unsigned OrigLength=0;
4887 // *startBuf != '^' if we are dealing with a pointer to function that
4888 // may take block argument types (which will be handled below).
4889 if (*startBuf == '^') {
4890 // Replace the '^' with '*', computing a negative offset.
4891 buf = '*';
4892 startBuf++;
4893 OrigLength++;
4894 }
4895 while (*startBuf != ')') {
4896 buf += *startBuf;
4897 startBuf++;
4898 OrigLength++;
4899 }
4900 buf += ')';
4901 OrigLength++;
4902
4903 if (PointerTypeTakesAnyBlockArguments(DeclT) ||
4904 PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
4905 // Replace the '^' with '*' for arguments.
4906 // Replace id<P> with id/*<>*/
4907 DeclLoc = ND->getLocation();
4908 startBuf = SM->getCharacterData(DeclLoc);
4909 const char *argListBegin, *argListEnd;
4910 GetExtentOfArgList(startBuf, argListBegin, argListEnd);
4911 while (argListBegin < argListEnd) {
4912 if (*argListBegin == '^')
4913 buf += '*';
4914 else if (*argListBegin == '<') {
4915 buf += "/*";
4916 buf += *argListBegin++;
4917 OrigLength++;
4918 while (*argListBegin != '>') {
4919 buf += *argListBegin++;
4920 OrigLength++;
4921 }
4922 buf += *argListBegin;
4923 buf += "*/";
4924 }
4925 else
4926 buf += *argListBegin;
4927 argListBegin++;
4928 OrigLength++;
4929 }
4930 buf += ')';
4931 OrigLength++;
4932 }
4933 ReplaceText(Start, OrigLength, buf);
4934}
4935
4936/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
4937/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
4938/// struct Block_byref_id_object *src) {
4939/// _Block_object_assign (&_dest->object, _src->object,
4940/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4941/// [|BLOCK_FIELD_IS_WEAK]) // object
4942/// _Block_object_assign(&_dest->object, _src->object,
4943/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4944/// [|BLOCK_FIELD_IS_WEAK]) // block
4945/// }
4946/// And:
4947/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
4948/// _Block_object_dispose(_src->object,
4949/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4950/// [|BLOCK_FIELD_IS_WEAK]) // object
4951/// _Block_object_dispose(_src->object,
4952/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4953/// [|BLOCK_FIELD_IS_WEAK]) // block
4954/// }
4955
4956std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
4957 int flag) {
4958 std::string S;
4959 if (CopyDestroyCache.count(flag))
4960 return S;
4961 CopyDestroyCache.insert(flag);
4962 S = "static void __Block_byref_id_object_copy_";
4963 S += utostr(flag);
4964 S += "(void *dst, void *src) {\n";
4965
4966 // offset into the object pointer is computed as:
4967 // void * + void* + int + int + void* + void *
4968 unsigned IntSize =
4969 static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
4970 unsigned VoidPtrSize =
4971 static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
4972
4973 unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
4974 S += " _Block_object_assign((char*)dst + ";
4975 S += utostr(offset);
4976 S += ", *(void * *) ((char*)src + ";
4977 S += utostr(offset);
4978 S += "), ";
4979 S += utostr(flag);
4980 S += ");\n}\n";
4981
4982 S += "static void __Block_byref_id_object_dispose_";
4983 S += utostr(flag);
4984 S += "(void *src) {\n";
4985 S += " _Block_object_dispose(*(void * *) ((char*)src + ";
4986 S += utostr(offset);
4987 S += "), ";
4988 S += utostr(flag);
4989 S += ");\n}\n";
4990 return S;
4991}
4992
4993/// RewriteByRefVar - For each __block typex ND variable this routine transforms
4994/// the declaration into:
4995/// struct __Block_byref_ND {
4996/// void *__isa; // NULL for everything except __weak pointers
4997/// struct __Block_byref_ND *__forwarding;
4998/// int32_t __flags;
4999/// int32_t __size;
5000/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
5001/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
5002/// typex ND;
5003/// };
5004///
5005/// It then replaces declaration of ND variable with:
5006/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
5007/// __size=sizeof(struct __Block_byref_ND),
5008/// ND=initializer-if-any};
5009///
5010///
5011void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
5012 bool lastDecl) {
5013 int flag = 0;
5014 int isa = 0;
5015 SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
5016 if (DeclLoc.isInvalid())
5017 // If type location is missing, it is because of missing type (a warning).
5018 // Use variable's location which is good for this case.
5019 DeclLoc = ND->getLocation();
5020 const char *startBuf = SM->getCharacterData(DeclLoc);
5021 SourceLocation X = ND->getEndLoc();
5022 X = SM->getExpansionLoc(X);
5023 const char *endBuf = SM->getCharacterData(X);
5024 std::string Name(ND->getNameAsString());
5025 std::string ByrefType;
5026 RewriteByRefString(ByrefType, Name, ND, true);
5027 ByrefType += " {\n";
5028 ByrefType += " void *__isa;\n";
5029 RewriteByRefString(ByrefType, Name, ND);
5030 ByrefType += " *__forwarding;\n";
5031 ByrefType += " int __flags;\n";
5032 ByrefType += " int __size;\n";
5033 // Add void *__Block_byref_id_object_copy;
5034 // void *__Block_byref_id_object_dispose; if needed.
5035 QualType Ty = ND->getType();
5036 bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
5037 if (HasCopyAndDispose) {
5038 ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
5039 ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
5040 }
5041
5042 QualType T = Ty;
5043 (void)convertBlockPointerToFunctionPointer(T);
5044 T.getAsStringInternal(Name, Context->getPrintingPolicy());
5045
5046 ByrefType += " " + Name + ";\n";
5047 ByrefType += "};\n";
5048 // Insert this type in global scope. It is needed by helper function.
5049 SourceLocation FunLocStart;
5050 if (CurFunctionDef)
5051 FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
5052 else {
5053 assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null")(static_cast<void> (0));
5054 FunLocStart = CurMethodDef->getBeginLoc();
5055 }
5056 InsertText(FunLocStart, ByrefType);
5057
5058 if (Ty.isObjCGCWeak()) {
5059 flag |= BLOCK_FIELD_IS_WEAK;
5060 isa = 1;
5061 }
5062 if (HasCopyAndDispose) {
5063 flag = BLOCK_BYREF_CALLER;
5064 QualType Ty = ND->getType();
5065 // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
5066 if (Ty->isBlockPointerType())
5067 flag |= BLOCK_FIELD_IS_BLOCK;
5068 else
5069 flag |= BLOCK_FIELD_IS_OBJECT;
5070 std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
5071 if (!HF.empty())
5072 Preamble += HF;
5073 }
5074
5075 // struct __Block_byref_ND ND =
5076 // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
5077 // initializer-if-any};
5078 bool hasInit = (ND->getInit() != nullptr);
5079 // FIXME. rewriter does not support __block c++ objects which
5080 // require construction.
5081 if (hasInit)
5082 if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(ND->getInit())) {
5083 CXXConstructorDecl *CXXDecl = CExp->getConstructor();
5084 if (CXXDecl && CXXDecl->isDefaultConstructor())
5085 hasInit = false;
5086 }
5087
5088 unsigned flags = 0;
5089 if (HasCopyAndDispose)
5090 flags |= BLOCK_HAS_COPY_DISPOSE;
5091 Name = ND->getNameAsString();
5092 ByrefType.clear();
5093 RewriteByRefString(ByrefType, Name, ND);
5094 std::string ForwardingCastType("(");
5095 ForwardingCastType += ByrefType + " *)";
5096 ByrefType += " " + Name + " = {(void*)";
5097 ByrefType += utostr(isa);
5098 ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
5099 ByrefType += utostr(flags);
5100 ByrefType += ", ";
5101 ByrefType += "sizeof(";
5102 RewriteByRefString(ByrefType, Name, ND);
5103 ByrefType += ")";
5104 if (HasCopyAndDispose) {
5105 ByrefType += ", __Block_byref_id_object_copy_";
5106 ByrefType += utostr(flag);
5107 ByrefType += ", __Block_byref_id_object_dispose_";
5108 ByrefType += utostr(flag);
5109 }
5110
5111 if (!firstDecl) {
5112 // In multiple __block declarations, and for all but 1st declaration,
5113 // find location of the separating comma. This would be start location
5114 // where new text is to be inserted.
5115 DeclLoc = ND->getLocation();
5116 const char *startDeclBuf = SM->getCharacterData(DeclLoc);
5117 const char *commaBuf = startDeclBuf;
5118 while (*commaBuf != ',')
5119 commaBuf--;
5120 assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','")(static_cast<void> (0));
5121 DeclLoc = DeclLoc.getLocWithOffset(commaBuf - startDeclBuf);
5122 startBuf = commaBuf;
5123 }
5124
5125 if (!hasInit) {
5126 ByrefType += "};\n";
5127 unsigned nameSize = Name.size();
5128 // for block or function pointer declaration. Name is already
5129 // part of the declaration.
5130 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
5131 nameSize = 1;
5132 ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
5133 }
5134 else {
5135 ByrefType += ", ";
5136 SourceLocation startLoc;
5137 Expr *E = ND->getInit();
5138 if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
5139 startLoc = ECE->getLParenLoc();
5140 else
5141 startLoc = E->getBeginLoc();
5142 startLoc = SM->getExpansionLoc(startLoc);
5143 endBuf = SM->getCharacterData(startLoc);
5144 ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
5145
5146 const char separator = lastDecl ? ';' : ',';
5147 const char *startInitializerBuf = SM->getCharacterData(startLoc);
5148 const char *separatorBuf = strchr(startInitializerBuf, separator);
5149 assert((*separatorBuf == separator) &&(static_cast<void> (0))
5150 "RewriteByRefVar: can't find ';' or ','")(static_cast<void> (0));
5151 SourceLocation separatorLoc =
5152 startLoc.getLocWithOffset(separatorBuf-startInitializerBuf);
5153
5154 InsertText(separatorLoc, lastDecl ? "}" : "};\n");
5155 }
5156}
5157
5158void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
5159 // Add initializers for any closure decl refs.
5160 GetBlockDeclRefExprs(Exp->getBody());
5161 if (BlockDeclRefs.size()) {
5162 // Unique all "by copy" declarations.
5163 for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5164 if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5165 if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5166 BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5167 BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
5168 }
5169 }
5170 // Unique all "by ref" declarations.
5171 for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5172 if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5173 if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5174 BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5175 BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
5176 }
5177 }
5178 // Find any imported blocks...they will need special attention.
5179 for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5180 if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5181 BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5182 BlockDeclRefs[i]->getType()->isBlockPointerType())
5183 ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
5184 }
5185}
5186
5187FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
5188 IdentifierInfo *ID = &Context->Idents.get(name);
5189 QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
5190 return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
5191 SourceLocation(), ID, FType, nullptr, SC_Extern,
5192 false, false);
5193}
5194
5195Stmt *RewriteModernObjC::SynthBlockInitExpr(BlockExpr *Exp,
5196 const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
5197 const BlockDecl *block = Exp->getBlockDecl();
5198
5199 Blocks.push_back(Exp);
5200
5201 CollectBlockDeclRefInfo(Exp);
5202
5203 // Add inner imported variables now used in current block.
5204 int countOfInnerDecls = 0;
5205 if (!InnerBlockDeclRefs.empty()) {
5206 for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
5207 DeclRefExpr *Exp = InnerBlockDeclRefs[i];
5208 ValueDecl *VD = Exp->getDecl();
5209 if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
5210 // We need to save the copied-in variables in nested
5211 // blocks because it is needed at the end for some of the API generations.
5212 // See SynthesizeBlockLiterals routine.
5213 InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5214 BlockDeclRefs.push_back(Exp);
5215 BlockByCopyDeclsPtrSet.insert(VD);
5216 BlockByCopyDecls.push_back(VD);
5217 }
5218 if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
5219 InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5220 BlockDeclRefs.push_back(Exp);
5221 BlockByRefDeclsPtrSet.insert(VD);
5222 BlockByRefDecls.push_back(VD);
5223 }
5224 }
5225 // Find any imported blocks...they will need special attention.
5226 for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
5227 if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5228 InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5229 InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
5230 ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
5231 }
5232 InnerDeclRefsCount.push_back(countOfInnerDecls);
5233
5234 std::string FuncName;
5235
5236 if (CurFunctionDef)
5237 FuncName = CurFunctionDef->getNameAsString();
5238 else if (CurMethodDef)
5239 BuildUniqueMethodName(FuncName, CurMethodDef);
5240 else if (GlobalVarDecl)
5241 FuncName = std::string(GlobalVarDecl->getNameAsString());
5242
5243 bool GlobalBlockExpr =
5244 block->getDeclContext()->getRedeclContext()->isFileContext();
5245
5246 if (GlobalBlockExpr && !GlobalVarDecl) {
5247 Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
5248 GlobalBlockExpr = false;
5249 }
5250
5251 std::string BlockNumber = utostr(Blocks.size()-1);
5252
5253 std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
5254
5255 // Get a pointer to the function type so we can cast appropriately.
5256 QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
5257 QualType FType = Context->getPointerType(BFT);
5258
5259 FunctionDecl *FD;
5260 Expr *NewRep;
5261
5262 // Simulate a constructor call...
5263 std::string Tag;
5264
5265 if (GlobalBlockExpr)
5266 Tag = "__global_";
5267 else
5268 Tag = "__";
5269 Tag += FuncName + "_block_impl_" + BlockNumber;
5270
5271 FD = SynthBlockInitFunctionDecl(Tag);
5272 DeclRefExpr *DRE = new (Context)
5273 DeclRefExpr(*Context, FD, false, FType, VK_PRValue, SourceLocation());
5274
5275 SmallVector<Expr*, 4> InitExprs;
5276
5277 // Initialize the block function.
5278 FD = SynthBlockInitFunctionDecl(Func);
5279 DeclRefExpr *Arg = new (Context) DeclRefExpr(
5280 *Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
5281 CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5282 CK_BitCast, Arg);
5283 InitExprs.push_back(castExpr);
5284
5285 // Initialize the block descriptor.
5286 std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
5287
5288 VarDecl *NewVD = VarDecl::Create(
5289 *Context, TUDecl, SourceLocation(), SourceLocation(),
5290 &Context->Idents.get(DescData), Context->VoidPtrTy, nullptr, SC_Static);
5291 UnaryOperator *DescRefExpr = UnaryOperator::Create(
5292 const_cast<ASTContext &>(*Context),
5293 new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
5294 VK_LValue, SourceLocation()),
5295 UO_AddrOf, Context->getPointerType(Context->VoidPtrTy), VK_PRValue,
5296 OK_Ordinary, SourceLocation(), false, FPOptionsOverride());
5297 InitExprs.push_back(DescRefExpr);
5298
5299 // Add initializers for any closure decl refs.
5300 if (BlockDeclRefs.size()) {
5301 Expr *Exp;
5302 // Output all "by copy" declarations.
5303 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
5304 E = BlockByCopyDecls.end(); I != E; ++I) {
5305 if (isObjCType((*I)->getType())) {
5306 // FIXME: Conform to ABI ([[obj retain] autorelease]).
5307 FD = SynthBlockInitFunctionDecl((*I)->getName());
5308 Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5309 VK_LValue, SourceLocation());
5310 if (HasLocalVariableExternalStorage(*I)) {
5311 QualType QT = (*I)->getType();
5312 QT = Context->getPointerType(QT);
5313 Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
5314 UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
5315 SourceLocation(), false,
5316 FPOptionsOverride());
5317 }
5318 } else if (isTopLevelBlockPointerType((*I)->getType())) {
5319 FD = SynthBlockInitFunctionDecl((*I)->getName());
5320 Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5321 VK_LValue, SourceLocation());
5322 Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5323 CK_BitCast, Arg);
5324 } else {
5325 FD = SynthBlockInitFunctionDecl((*I)->getName());
5326 Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5327 VK_LValue, SourceLocation());
5328 if (HasLocalVariableExternalStorage(*I)) {
5329 QualType QT = (*I)->getType();
5330 QT = Context->getPointerType(QT);
5331 Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
5332 UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
5333 SourceLocation(), false,
5334 FPOptionsOverride());
5335 }
5336
5337 }
5338 InitExprs.push_back(Exp);
5339 }
5340 // Output all "by ref" declarations.
5341 for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
5342 E = BlockByRefDecls.end(); I != E; ++I) {
5343 ValueDecl *ND = (*I);
5344 std::string Name(ND->getNameAsString());
5345 std::string RecName;
5346 RewriteByRefString(RecName, Name, ND, true);
5347 IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
5348 + sizeof("struct"));
5349 RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
5350 SourceLocation(), SourceLocation(),
5351 II);
5352 assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl")(static_cast<void> (0));
5353 QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
5354
5355 FD = SynthBlockInitFunctionDecl((*I)->getName());
5356 Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5357 VK_LValue, SourceLocation());
5358 bool isNestedCapturedVar = false;
5359 if (block)
5360 for (const auto &CI : block->captures()) {
5361 const VarDecl *variable = CI.getVariable();
5362 if (variable == ND && CI.isNested()) {
5363 assert (CI.isByRef() &&(static_cast<void> (0))
5364 "SynthBlockInitExpr - captured block variable is not byref")(static_cast<void> (0));
5365 isNestedCapturedVar = true;
5366 break;
5367 }
5368 }
5369 // captured nested byref variable has its address passed. Do not take
5370 // its address again.
5371 if (!isNestedCapturedVar)
5372 Exp = UnaryOperator::Create(
5373 const_cast<ASTContext &>(*Context), Exp, UO_AddrOf,
5374 Context->getPointerType(Exp->getType()), VK_PRValue, OK_Ordinary,
5375 SourceLocation(), false, FPOptionsOverride());
5376 Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
5377 InitExprs.push_back(Exp);
5378 }
5379 }
5380 if (ImportedBlockDecls.size()) {
5381 // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
5382 int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
5383 unsigned IntSize =
5384 static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5385 Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
5386 Context->IntTy, SourceLocation());
5387 InitExprs.push_back(FlagExp);
5388 }
5389 NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
5390 SourceLocation(), FPOptionsOverride());
5391
5392 if (GlobalBlockExpr) {
5393 assert (!GlobalConstructionExp &&(static_cast<void> (0))
5394 "SynthBlockInitExpr - GlobalConstructionExp must be null")(static_cast<void> (0));
5395 GlobalConstructionExp = NewRep;
5396 NewRep = DRE;
5397 }
5398
5399 NewRep = UnaryOperator::Create(
5400 const_cast<ASTContext &>(*Context), NewRep, UO_AddrOf,
5401 Context->getPointerType(NewRep->getType()), VK_PRValue, OK_Ordinary,
5402 SourceLocation(), false, FPOptionsOverride());
5403 NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
5404 NewRep);
5405 // Put Paren around the call.
5406 NewRep = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
5407 NewRep);
5408
5409 BlockDeclRefs.clear();
5410 BlockByRefDecls.clear();
5411 BlockByRefDeclsPtrSet.clear();
5412 BlockByCopyDecls.clear();
5413 BlockByCopyDeclsPtrSet.clear();
5414 ImportedBlockDecls.clear();
5415 return NewRep;
5416}
5417
5418bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
5419 if (const ObjCForCollectionStmt * CS =
5420 dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
5421 return CS->getElement() == DS;
5422 return false;
5423}
5424
5425//===----------------------------------------------------------------------===//
5426// Function Body / Expression rewriting
5427//===----------------------------------------------------------------------===//
5428
5429Stmt *RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
5430 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5431 isa<DoStmt>(S) || isa<ForStmt>(S))
5432 Stmts.push_back(S);
5433 else if (isa<ObjCForCollectionStmt>(S)) {
5434 Stmts.push_back(S);
5435 ObjCBcLabelNo.push_back(++BcLabelCount);
5436 }
5437
5438 // Pseudo-object operations and ivar references need special
5439 // treatment because we're going to recursively rewrite them.
5440 if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
5441 if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
5442 return RewritePropertyOrImplicitSetter(PseudoOp);
5443 } else {
5444 return RewritePropertyOrImplicitGetter(PseudoOp);
5445 }
5446 } else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
5447 return RewriteObjCIvarRefExpr(IvarRefExpr);
5448 }
5449 else if (isa<OpaqueValueExpr>(S))
5450 S = cast<OpaqueValueExpr>(S)->getSourceExpr();
5451
5452 SourceRange OrigStmtRange = S->getSourceRange();
5453
5454 // Perform a bottom up rewrite of all children.
5455 for (Stmt *&childStmt : S->children())
5456 if (childStmt) {
5457 Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
5458 if (newStmt) {
5459 childStmt = newStmt;
5460 }
5461 }
5462
5463 if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
5464 SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
5465 llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
5466 InnerContexts.insert(BE->getBlockDecl());
5467 ImportedLocalExternalDecls.clear();
5468 GetInnerBlockDeclRefExprs(BE->getBody(),
5469 InnerBlockDeclRefs, InnerContexts);
5470 // Rewrite the block body in place.
5471 Stmt *SaveCurrentBody = CurrentBody;
5472 CurrentBody = BE->getBody();
5473 PropParentMap = nullptr;
5474 // block literal on rhs of a property-dot-sytax assignment
5475 // must be replaced by its synthesize ast so getRewrittenText
5476 // works as expected. In this case, what actually ends up on RHS
5477 // is the blockTranscribed which is the helper function for the
5478 // block literal; as in: self.c = ^() {[ace ARR];};
5479 bool saveDisableReplaceStmt = DisableReplaceStmt;
5480 DisableReplaceStmt = false;
5481 RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
5482 DisableReplaceStmt = saveDisableReplaceStmt;
5483 CurrentBody = SaveCurrentBody;
5484 PropParentMap = nullptr;
5485 ImportedLocalExternalDecls.clear();
5486 // Now we snarf the rewritten text and stash it away for later use.
5487 std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
5488 RewrittenBlockExprs[BE] = Str;
5489
5490 Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
5491
5492 //blockTranscribed->dump();
5493 ReplaceStmt(S, blockTranscribed);
5494 return blockTranscribed;
5495 }
5496 // Handle specific things.
5497 if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
5498 return RewriteAtEncode(AtEncode);
5499
5500 if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
5501 return RewriteAtSelector(AtSelector);
5502
5503 if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
5504 return RewriteObjCStringLiteral(AtString);
5505
5506 if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(S))
5507 return RewriteObjCBoolLiteralExpr(BoolLitExpr);
5508
5509 if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(S))
5510 return RewriteObjCBoxedExpr(BoxedExpr);
5511
5512 if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(S))
5513 return RewriteObjCArrayLiteralExpr(ArrayLitExpr);
5514
5515 if (ObjCDictionaryLiteral *DictionaryLitExpr =
5516 dyn_cast<ObjCDictionaryLiteral>(S))
5517 return RewriteObjCDictionaryLiteralExpr(DictionaryLitExpr);
5518
5519 if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
5520#if 0
5521 // Before we rewrite it, put the original message expression in a comment.
5522 SourceLocation startLoc = MessExpr->getBeginLoc();
5523 SourceLocation endLoc = MessExpr->getEndLoc();
5524
5525 const char *startBuf = SM->getCharacterData(startLoc);
5526 const char *endBuf = SM->getCharacterData(endLoc);
5527
5528 std::string messString;
5529 messString += "// ";
5530 messString.append(startBuf, endBuf-startBuf+1);
5531 messString += "\n";
5532
5533 // FIXME: Missing definition of
5534 // InsertText(clang::SourceLocation, char const*, unsigned int).
5535 // InsertText(startLoc, messString);
5536 // Tried this, but it didn't work either...
5537 // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
5538#endif
5539 return RewriteMessageExpr(MessExpr);
5540 }
5541
5542 if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
5543 dyn_cast<ObjCAutoreleasePoolStmt>(S)) {
5544 return RewriteObjCAutoreleasePoolStmt(StmtAutoRelease);
5545 }
5546
5547 if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
5548 return RewriteObjCTryStmt(StmtTry);
5549
5550 if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
5551 return RewriteObjCSynchronizedStmt(StmtTry);
5552
5553 if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
5554 return RewriteObjCThrowStmt(StmtThrow);
5555
5556 if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
5557 return RewriteObjCProtocolExpr(ProtocolExp);
5558
5559 if (ObjCForCollectionStmt *StmtForCollection =
5560 dyn_cast<ObjCForCollectionStmt>(S))
5561 return RewriteObjCForCollectionStmt(StmtForCollection,
5562 OrigStmtRange.getEnd());
5563 if (BreakStmt *StmtBreakStmt =
5564 dyn_cast<BreakStmt>(S))
5565 return RewriteBreakStmt(StmtBreakStmt);
5566 if (ContinueStmt *StmtContinueStmt =
5567 dyn_cast<ContinueStmt>(S))
5568 return RewriteContinueStmt(StmtContinueStmt);
5569
5570 // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
5571 // and cast exprs.
5572 if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
5573 // FIXME: What we're doing here is modifying the type-specifier that
5574 // precedes the first Decl. In the future the DeclGroup should have
5575 // a separate type-specifier that we can rewrite.
5576 // NOTE: We need to avoid rewriting the DeclStmt if it is within
5577 // the context of an ObjCForCollectionStmt. For example:
5578 // NSArray *someArray;
5579 // for (id <FooProtocol> index in someArray) ;
5580 // This is because RewriteObjCForCollectionStmt() does textual rewriting
5581 // and it depends on the original text locations/positions.
5582 if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
5583 RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
5584
5585 // Blocks rewrite rules.
5586 for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
5587 DI != DE; ++DI) {
5588 Decl *SD = *DI;
5589 if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
5590 if (isTopLevelBlockPointerType(ND->getType()))
5591 RewriteBlockPointerDecl(ND);
5592 else if (ND->getType()->isFunctionPointerType())
5593 CheckFunctionPointerDecl(ND->getType(), ND);
5594 if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
5595 if (VD->hasAttr<BlocksAttr>()) {
5596 static unsigned uniqueByrefDeclCount = 0;
5597 assert(!BlockByRefDeclNo.count(ND) &&(static_cast<void> (0))
5598 "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl")(static_cast<void> (0));
5599 BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
5600 RewriteByRefVar(VD, (DI == DS->decl_begin()), ((DI+1) == DE));
5601 }
5602 else
5603 RewriteTypeOfDecl(VD);
5604 }
5605 }
5606 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
5607 if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5608 RewriteBlockPointerDecl(TD);
5609 else if (TD->getUnderlyingType()->isFunctionPointerType())
5610 CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5611 }
5612 }
5613 }
5614
5615 if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
5616 RewriteObjCQualifiedInterfaceTypes(CE);
5617
5618 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5619 isa<DoStmt>(S) || isa<ForStmt>(S)) {
5620 assert(!Stmts.empty() && "Statement stack is empty")(static_cast<void> (0));
5621 assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||(static_cast<void> (0))
5622 isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))(static_cast<void> (0))
5623 && "Statement stack mismatch")(static_cast<void> (0));
5624 Stmts.pop_back();
5625 }
5626 // Handle blocks rewriting.
5627 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
5628 ValueDecl *VD = DRE->getDecl();
5629 if (VD->hasAttr<BlocksAttr>())
5630 return RewriteBlockDeclRefExpr(DRE);
5631 if (HasLocalVariableExternalStorage(VD))
5632 return RewriteLocalVariableExternalStorage(DRE);
5633 }
5634
5635 if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
5636 if (CE->getCallee()->getType()->isBlockPointerType()) {
5637 Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
5638 ReplaceStmt(S, BlockCall);
5639 return BlockCall;
5640 }
5641 }
5642 if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
5643 RewriteCastExpr(CE);
5644 }
5645 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5646 RewriteImplicitCastObjCExpr(ICE);
5647 }
5648#if 0
5649
5650 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5651 CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
5652 ICE->getSubExpr(),
5653 SourceLocation());
5654 // Get the new text.
5655 std::string SStr;
5656 llvm::raw_string_ostream Buf(SStr);
5657 Replacement->printPretty(Buf);
5658 const std::string &Str = Buf.str();
5659
5660 printf("CAST = %s\n", &Str[0]);
5661 InsertText(ICE->getSubExpr()->getBeginLoc(), Str);
5662 delete S;
5663 return Replacement;
5664 }
5665#endif
5666 // Return this stmt unmodified.
5667 return S;
5668}
5669
5670void RewriteModernObjC::RewriteRecordBody(RecordDecl *RD) {
5671 for (auto *FD : RD->fields()) {
5672 if (isTopLevelBlockPointerType(FD->getType()))
5673 RewriteBlockPointerDecl(FD);
5674 if (FD->getType()->isObjCQualifiedIdType() ||
5675 FD->getType()->isObjCQualifiedInterfaceType())
5676 RewriteObjCQualifiedInterfaceTypes(FD);
5677 }
5678}
5679
5680/// HandleDeclInMainFile - This is called for each top-level decl defined in the
5681/// main file of the input.
5682void RewriteModernObjC::HandleDeclInMainFile(Decl *D) {
5683 switch (D->getKind()) {
5684 case Decl::Function: {
5685 FunctionDecl *FD = cast<FunctionDecl>(D);
5686 if (FD->isOverloadedOperator())
5687 return;
5688
5689 // Since function prototypes don't have ParmDecl's, we check the function
5690 // prototype. This enables us to rewrite function declarations and
5691 // definitions using the same code.
5692 RewriteBlocksInFunctionProtoType(FD->getType(), FD);
5693
5694 if (!FD->isThisDeclarationADefinition())
5695 break;
5696
5697 // FIXME: If this should support Obj-C++, support CXXTryStmt
5698 if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
5699 CurFunctionDef = FD;
5700 CurrentBody = Body;
5701 Body =
5702 cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5703 FD->setBody(Body);
5704 CurrentBody = nullptr;
5705 if (PropParentMap) {
5706 delete PropParentMap;
5707 PropParentMap = nullptr;
5708 }
5709 // This synthesizes and inserts the block "impl" struct, invoke function,
5710 // and any copy/dispose helper functions.
5711 InsertBlockLiteralsWithinFunction(FD);
5712 RewriteLineDirective(D);
5713 CurFunctionDef = nullptr;
5714 }
5715 break;
5716 }
5717 case Decl::ObjCMethod: {
5718 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
5719 if (CompoundStmt *Body = MD->getCompoundBody()) {
5720 CurMethodDef = MD;
5721 CurrentBody = Body;
5722 Body =
5723 cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5724 MD->setBody(Body);
5725 CurrentBody = nullptr;
5726 if (PropParentMap) {
5727 delete PropParentMap;
5728 PropParentMap = nullptr;
5729 }
5730 InsertBlockLiteralsWithinMethod(MD);
5731 RewriteLineDirective(D);
5732 CurMethodDef = nullptr;
5733 }
5734 break;
5735 }
5736 case Decl::ObjCImplementation: {
5737 ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
5738 ClassImplementation.push_back(CI);
5739 break;
5740 }
5741 case Decl::ObjCCategoryImpl: {
5742 ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
5743 CategoryImplementation.push_back(CI);
5744 break;
5745 }
5746 case Decl::Var: {
5747 VarDecl *VD = cast<VarDecl>(D);
5748 RewriteObjCQualifiedInterfaceTypes(VD);
5749 if (isTopLevelBlockPointerType(VD->getType()))
5750 RewriteBlockPointerDecl(VD);
5751 else if (VD->getType()->isFunctionPointerType()) {
5752 CheckFunctionPointerDecl(VD->getType(), VD);
5753 if (VD->getInit()) {
5754 if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5755 RewriteCastExpr(CE);
5756 }
5757 }
5758 } else if (VD->getType()->isRecordType()) {
5759 RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();
5760 if (RD->isCompleteDefinition())
5761 RewriteRecordBody(RD);
5762 }
5763 if (VD->getInit()) {
5764 GlobalVarDecl = VD;
5765 CurrentBody = VD->getInit();
5766 RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
5767 CurrentBody = nullptr;
5768 if (PropParentMap) {
5769 delete PropParentMap;
5770 PropParentMap = nullptr;
5771 }
5772 SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
5773 GlobalVarDecl = nullptr;
5774
5775 // This is needed for blocks.
5776 if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5777 RewriteCastExpr(CE);
5778 }
5779 }
5780 break;
5781 }
5782 case Decl::TypeAlias:
5783 case Decl::Typedef: {
5784 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
5785 if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5786 RewriteBlockPointerDecl(TD);
5787 else if (TD->getUnderlyingType()->isFunctionPointerType())
5788 CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5789 else
5790 RewriteObjCQualifiedInterfaceTypes(TD);
5791 }
5792 break;
5793 }
5794 case Decl::CXXRecord:
5795 case Decl::Record: {
5796 RecordDecl *RD = cast<RecordDecl>(D);
5797 if (RD->isCompleteDefinition())
5798 RewriteRecordBody(RD);
5799 break;
5800 }
5801 default:
5802 break;
5803 }
5804 // Nothing yet.
5805}
5806
5807/// Write_ProtocolExprReferencedMetadata - This routine writer out the
5808/// protocol reference symbols in the for of:
5809/// struct _protocol_t *PROTOCOL_REF = &PROTOCOL_METADATA.
5810static void Write_ProtocolExprReferencedMetadata(ASTContext *Context,
5811 ObjCProtocolDecl *PDecl,
5812 std::string &Result) {
5813 // Also output .objc_protorefs$B section and its meta-data.
5814 if (Context->getLangOpts().MicrosoftExt)
5815 Result += "static ";
5816 Result += "struct _protocol_t *";
5817 Result += "_OBJC_PROTOCOL_REFERENCE_$_";
5818 Result += PDecl->getNameAsString();
5819 Result += " = &";
5820 Result += "_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
5821 Result += ";\n";
5822}
5823
5824void RewriteModernObjC::HandleTranslationUnit(ASTContext &C) {
5825 if (Diags.hasErrorOccurred())
1
Assuming the condition is false
2
Taking false branch
5826 return;
5827
5828 RewriteInclude();
5829
5830 for (unsigned i = 0, e = FunctionDefinitionsSeen.size(); i < e; i++) {
3
Assuming 'i' is >= 'e'
4
Loop condition is false. Execution continues on line 5840
5831 // translation of function bodies were postponed until all class and
5832 // their extensions and implementations are seen. This is because, we
5833 // cannot build grouping structs for bitfields until they are all seen.
5834 FunctionDecl *FDecl = FunctionDefinitionsSeen[i];
5835 HandleTopLevelSingleDecl(FDecl);
5836 }
5837
5838 // Here's a great place to add any extra declarations that may be needed.
5839 // Write out meta data for each @protocol(<expr>).
5840 for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
5841 RewriteObjCProtocolMetaData(ProtDecl, Preamble);
5842 Write_ProtocolExprReferencedMetadata(Context, ProtDecl, Preamble);
5843 }
5844
5845 InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
5846
5847 if (ClassImplementation.size() || CategoryImplementation.size())
5
Assuming the condition is false
6
Assuming the condition is true
7
Taking true branch
5848 RewriteImplementations();
8
Calling 'RewriteModernObjC::RewriteImplementations'
5849
5850 for (unsigned i = 0, e = ObjCInterfacesSeen.size(); i < e; i++) {
5851 ObjCInterfaceDecl *CDecl = ObjCInterfacesSeen[i];
5852 // Write struct declaration for the class matching its ivar declarations.
5853 // Note that for modern abi, this is postponed until the end of TU
5854 // because class extensions and the implementation might declare their own
5855 // private ivars.
5856 RewriteInterfaceDecl(CDecl);
5857 }
5858
5859 // Get the buffer corresponding to MainFileID. If we haven't changed it, then
5860 // we are done.
5861 if (const RewriteBuffer *RewriteBuf =
5862 Rewrite.getRewriteBufferFor(MainFileID)) {
5863 //printf("Changed:\n");
5864 *OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
5865 } else {
5866 llvm::errs() << "No changes\n";
5867 }
5868
5869 if (ClassImplementation.size() || CategoryImplementation.size() ||
5870 ProtocolExprDecls.size()) {
5871 // Rewrite Objective-c meta data*
5872 std::string ResultStr;
5873 RewriteMetaDataIntoBuffer(ResultStr);
5874 // Emit metadata.
5875 *OutFile << ResultStr;
5876 }
5877 // Emit ImageInfo;
5878 {
5879 std::string ResultStr;
5880 WriteImageInfo(ResultStr);
5881 *OutFile << ResultStr;
5882 }
5883 OutFile->flush();
5884}
5885
5886void RewriteModernObjC::Initialize(ASTContext &context) {
5887 InitializeCommon(context);
5888
5889 Preamble += "#ifndef __OBJC2__\n";
5890 Preamble += "#define __OBJC2__\n";
5891 Preamble += "#endif\n";
5892
5893 // declaring objc_selector outside the parameter list removes a silly
5894 // scope related warning...
5895 if (IsHeader)
5896 Preamble = "#pragma once\n";
5897 Preamble += "struct objc_selector; struct objc_class;\n";
5898 Preamble += "struct __rw_objc_super { \n\tstruct objc_object *object; ";
5899 Preamble += "\n\tstruct objc_object *superClass; ";
5900 // Add a constructor for creating temporary objects.
5901 Preamble += "\n\t__rw_objc_super(struct objc_object *o, struct objc_object *s) ";
5902 Preamble += ": object(o), superClass(s) {} ";
5903 Preamble += "\n};\n";
5904
5905 if (LangOpts.MicrosoftExt) {
5906 // Define all sections using syntax that makes sense.
5907 // These are currently generated.
5908 Preamble += "\n#pragma section(\".objc_classlist$B\", long, read, write)\n";
5909 Preamble += "#pragma section(\".objc_catlist$B\", long, read, write)\n";
5910 Preamble += "#pragma section(\".objc_imageinfo$B\", long, read, write)\n";
5911 Preamble += "#pragma section(\".objc_nlclslist$B\", long, read, write)\n";
5912 Preamble += "#pragma section(\".objc_nlcatlist$B\", long, read, write)\n";
5913 // These are generated but not necessary for functionality.
5914 Preamble += "#pragma section(\".cat_cls_meth$B\", long, read, write)\n";
5915 Preamble += "#pragma section(\".inst_meth$B\", long, read, write)\n";
5916 Preamble += "#pragma section(\".cls_meth$B\", long, read, write)\n";
5917 Preamble += "#pragma section(\".objc_ivar$B\", long, read, write)\n";
5918
5919 // These need be generated for performance. Currently they are not,
5920 // using API calls instead.
5921 Preamble += "#pragma section(\".objc_selrefs$B\", long, read, write)\n";
5922 Preamble += "#pragma section(\".objc_classrefs$B\", long, read, write)\n";
5923 Preamble += "#pragma section(\".objc_superrefs$B\", long, read, write)\n";
5924
5925 }
5926 Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
5927 Preamble += "typedef struct objc_object Protocol;\n";
5928 Preamble += "#define _REWRITER_typedef_Protocol\n";
5929 Preamble += "#endif\n";
5930 if (LangOpts.MicrosoftExt) {
5931 Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
5932 Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
5933 }
5934 else
5935 Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
5936
5937 Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend(void);\n";
5938 Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper(void);\n";
5939 Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_stret(void);\n";
5940 Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper_stret(void);\n";
5941 Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_fpret(void);\n";
5942
5943 Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getClass";
5944 Preamble += "(const char *);\n";
5945 Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
5946 Preamble += "(struct objc_class *);\n";
5947 Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getMetaClass";
5948 Preamble += "(const char *);\n";
5949 Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw( struct objc_object *);\n";
5950 // @synchronized hooks.
5951 Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter( struct objc_object *);\n";
5952 Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit( struct objc_object *);\n";
5953 Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
5954 Preamble += "#ifdef _WIN64\n";
5955 Preamble += "typedef unsigned long long _WIN_NSUInteger;\n";
5956 Preamble += "#else\n";
5957 Preamble += "typedef unsigned int _WIN_NSUInteger;\n";
5958 Preamble += "#endif\n";
5959 Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
5960 Preamble += "struct __objcFastEnumerationState {\n\t";
5961 Preamble += "unsigned long state;\n\t";
5962 Preamble += "void **itemsPtr;\n\t";
5963 Preamble += "unsigned long *mutationsPtr;\n\t";
5964 Preamble += "unsigned long extra[5];\n};\n";
5965 Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
5966 Preamble += "#define __FASTENUMERATIONSTATE\n";
5967 Preamble += "#endif\n";
5968 Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
5969 Preamble += "struct __NSConstantStringImpl {\n";
5970 Preamble += " int *isa;\n";
5971 Preamble += " int flags;\n";
5972 Preamble += " char *str;\n";
5973 Preamble += "#if _WIN64\n";
5974 Preamble += " long long length;\n";
5975 Preamble += "#else\n";
5976 Preamble += " long length;\n";
5977 Preamble += "#endif\n";
5978 Preamble += "};\n";
5979 Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
5980 Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
5981 Preamble += "#else\n";
5982 Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
5983 Preamble += "#endif\n";
5984 Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
5985 Preamble += "#endif\n";
5986 // Blocks preamble.
5987 Preamble += "#ifndef BLOCK_IMPL\n";
5988 Preamble += "#define BLOCK_IMPL\n";
5989 Preamble += "struct __block_impl {\n";
5990 Preamble += " void *isa;\n";
5991 Preamble += " int Flags;\n";
5992 Preamble += " int Reserved;\n";
5993 Preamble += " void *FuncPtr;\n";
5994 Preamble += "};\n";
5995 Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
5996 Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
5997 Preamble += "extern \"C\" __declspec(dllexport) "
5998 "void _Block_object_assign(void *, const void *, const int);\n";
5999 Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
6000 Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
6001 Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
6002 Preamble += "#else\n";
6003 Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
6004 Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
6005 Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
6006 Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
6007 Preamble += "#endif\n";
6008 Preamble += "#endif\n";
6009 if (LangOpts.MicrosoftExt) {
6010 Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
6011 Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
6012 Preamble += "#ifndef KEEP_ATTRIBUTES\n"; // We use this for clang tests.
6013 Preamble += "#define __attribute__(X)\n";
6014 Preamble += "#endif\n";
6015 Preamble += "#ifndef __weak\n";
6016 Preamble += "#define __weak\n";
6017 Preamble += "#endif\n";
6018 Preamble += "#ifndef __block\n";
6019 Preamble += "#define __block\n";
6020 Preamble += "#endif\n";
6021 }
6022 else {
6023 Preamble += "#define __block\n";
6024 Preamble += "#define __weak\n";
6025 }
6026
6027 // Declarations required for modern objective-c array and dictionary literals.
6028 Preamble += "\n#include <stdarg.h>\n";
6029 Preamble += "struct __NSContainer_literal {\n";
6030 Preamble += " void * *arr;\n";
6031 Preamble += " __NSContainer_literal (unsigned int count, ...) {\n";
6032 Preamble += "\tva_list marker;\n";
6033 Preamble += "\tva_start(marker, count);\n";
6034 Preamble += "\tarr = new void *[count];\n";
6035 Preamble += "\tfor (unsigned i = 0; i < count; i++)\n";
6036 Preamble += "\t arr[i] = va_arg(marker, void *);\n";
6037 Preamble += "\tva_end( marker );\n";
6038 Preamble += " };\n";
6039 Preamble += " ~__NSContainer_literal() {\n";
6040 Preamble += "\tdelete[] arr;\n";
6041 Preamble += " }\n";
6042 Preamble += "};\n";
6043
6044 // Declaration required for implementation of @autoreleasepool statement.
6045 Preamble += "extern \"C\" __declspec(dllimport) void * objc_autoreleasePoolPush(void);\n";
6046 Preamble += "extern \"C\" __declspec(dllimport) void objc_autoreleasePoolPop(void *);\n\n";
6047 Preamble += "struct __AtAutoreleasePool {\n";
6048 Preamble += " __AtAutoreleasePool() {atautoreleasepoolobj = objc_autoreleasePoolPush();}\n";
6049 Preamble += " ~__AtAutoreleasePool() {objc_autoreleasePoolPop(atautoreleasepoolobj);}\n";
6050 Preamble += " void * atautoreleasepoolobj;\n";
6051 Preamble += "};\n";
6052
6053 // NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
6054 // as this avoids warning in any 64bit/32bit compilation model.
6055 Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
6056}
6057
6058/// RewriteIvarOffsetComputation - This routine synthesizes computation of
6059/// ivar offset.
6060void RewriteModernObjC::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
6061 std::string &Result) {
6062 Result += "__OFFSETOFIVAR__(struct ";
6063 Result += ivar->getContainingInterface()->getNameAsString();
6064 if (LangOpts.MicrosoftExt)
6065 Result += "_IMPL";
6066 Result +=