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llvm-project/clang/Driver/RewriteObjC.cpp

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//===--- RewriteObjC.cpp - Playground for the code rewriter ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Hacks and fun related to the code rewriter.
//
//===----------------------------------------------------------------------===//
#include "ASTConsumers.h"
#include "clang/Rewrite/Rewriter.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/TranslationUnit.h"
#include "clang/AST/ParentMap.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Streams.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
using namespace clang;
using llvm::utostr;
static llvm::cl::opt<bool>
SilenceRewriteMacroWarning("Wno-rewrite-macros", llvm::cl::init(false),
llvm::cl::desc("Silence ObjC rewriting warnings"));
namespace {
class RewriteObjC : public ASTConsumer {
Rewriter Rewrite;
Diagnostic &Diags;
const LangOptions &LangOpts;
unsigned RewriteFailedDiag;
unsigned TryFinallyContainsReturnDiag;
ASTContext *Context;
SourceManager *SM;
TranslationUnitDecl *TUDecl;
FileID MainFileID;
const char *MainFileStart, *MainFileEnd;
SourceLocation LastIncLoc;
llvm::SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
llvm::SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCForwardDecls;
llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
llvm::SmallVector<Stmt *, 32> Stmts;
llvm::SmallVector<int, 8> ObjCBcLabelNo;
unsigned NumObjCStringLiterals;
FunctionDecl *MsgSendFunctionDecl;
FunctionDecl *MsgSendSuperFunctionDecl;
FunctionDecl *MsgSendStretFunctionDecl;
FunctionDecl *MsgSendSuperStretFunctionDecl;
FunctionDecl *MsgSendFpretFunctionDecl;
FunctionDecl *GetClassFunctionDecl;
FunctionDecl *GetMetaClassFunctionDecl;
FunctionDecl *SelGetUidFunctionDecl;
FunctionDecl *CFStringFunctionDecl;
FunctionDecl *GetProtocolFunctionDecl;
FunctionDecl *SuperContructorFunctionDecl;
// ObjC string constant support.
VarDecl *ConstantStringClassReference;
RecordDecl *NSStringRecord;
// ObjC foreach break/continue generation support.
int BcLabelCount;
// Needed for super.
ObjCMethodDecl *CurMethodDef;
RecordDecl *SuperStructDecl;
RecordDecl *ConstantStringDecl;
// Needed for header files being rewritten
bool IsHeader;
std::string InFileName;
std::string OutFileName;
std::string Preamble;
// Block expressions.
llvm::SmallVector<BlockExpr *, 32> Blocks;
llvm::SmallVector<BlockDeclRefExpr *, 32> BlockDeclRefs;
llvm::DenseMap<BlockDeclRefExpr *, CallExpr *> BlockCallExprs;
// Block related declarations.
llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDecls;
llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDecls;
llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
// This maps a property to it's assignment statement.
llvm::DenseMap<ObjCPropertyRefExpr *, BinaryOperator *> PropSetters;
// This maps a property to it's synthesied message expression.
// This allows us to rewrite chained getters (e.g. o.a.b.c).
llvm::DenseMap<ObjCPropertyRefExpr *, Stmt *> PropGetters;
// This maps an original source AST to it's rewritten form. This allows
// us to avoid rewriting the same node twice (which is very uncommon).
// This is needed to support some of the exotic property rewriting.
llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
FunctionDecl *CurFunctionDef;
VarDecl *GlobalVarDecl;
bool DisableReplaceStmt;
static const int OBJC_ABI_VERSION =7 ;
public:
virtual void Initialize(ASTContext &context);
virtual void InitializeTU(TranslationUnit &TU) {
TU.SetOwnsDecls(false);
Initialize(TU.getContext());
}
// Top Level Driver code.
virtual void HandleTopLevelDecl(Decl *D);
void HandleDeclInMainFile(Decl *D);
RewriteObjC(std::string inFile, std::string outFile,
Diagnostic &D, const LangOptions &LOpts);
~RewriteObjC() {}
virtual void HandleTranslationUnit(TranslationUnit& TU);
void ReplaceStmt(Stmt *Old, Stmt *New) {
Stmt *ReplacingStmt = ReplacedNodes[Old];
if (ReplacingStmt)
return; // We can't rewrite the same node twice.
if (DisableReplaceStmt)
return; // Used when rewriting the assignment of a property setter.
// If replacement succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceStmt(Old, New)) {
ReplacedNodes[Old] = New;
return;
}
if (SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
<< Old->getSourceRange();
}
void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
// Measaure the old text.
int Size = Rewrite.getRangeSize(SrcRange);
if (Size == -1) {
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
<< Old->getSourceRange();
return;
}
// Get the new text.
std::string SStr;
llvm::raw_string_ostream S(SStr);
New->printPretty(S);
const std::string &Str = S.str();
// If replacement succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, &Str[0], Str.size())) {
ReplacedNodes[Old] = New;
return;
}
if (SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
<< Old->getSourceRange();
}
void InsertText(SourceLocation Loc, const char *StrData, unsigned StrLen,
bool InsertAfter = true) {
// If insertion succeeded or warning disabled return with no warning.
if (!Rewrite.InsertText(Loc, StrData, StrLen, InsertAfter) ||
SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
}
void RemoveText(SourceLocation Loc, unsigned StrLen) {
// If removal succeeded or warning disabled return with no warning.
if (!Rewrite.RemoveText(Loc, StrLen) || SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
}
void ReplaceText(SourceLocation Start, unsigned OrigLength,
const char *NewStr, unsigned NewLength) {
// If removal succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceText(Start, OrigLength, NewStr, NewLength) ||
SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
}
// Syntactic Rewriting.
void RewritePrologue(SourceLocation Loc);
void RewriteInclude();
void RewriteTabs();
void RewriteForwardClassDecl(ObjCClassDecl *Dcl);
void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
ObjCImplementationDecl *IMD,
ObjCCategoryImplDecl *CID);
void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
void RewriteImplementationDecl(Decl *Dcl);
void RewriteObjCMethodDecl(ObjCMethodDecl *MDecl, std::string &ResultStr);
void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
void RewriteForwardProtocolDecl(ObjCForwardProtocolDecl *Dcl);
void RewriteMethodDeclaration(ObjCMethodDecl *Method);
void RewriteProperty(ObjCPropertyDecl *prop);
void RewriteFunctionDecl(FunctionDecl *FD);
void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
void RewriteObjCQualifiedInterfaceTypes(Expr *E);
bool needToScanForQualifiers(QualType T);
ObjCInterfaceDecl *isSuperReceiver(Expr *recExpr);
QualType getSuperStructType();
QualType getConstantStringStructType();
bool BufferContainsPPDirectives(const char *startBuf, const char *endBuf);
// Expression Rewriting.
Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
void CollectPropertySetters(Stmt *S);
Stmt *CurrentBody;
ParentMap *PropParentMap; // created lazily.
Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV, SourceLocation OrigStart);
Stmt *RewritePropertyGetter(ObjCPropertyRefExpr *PropRefExpr);
Stmt *RewritePropertySetter(BinaryOperator *BinOp, Expr *newStmt,
SourceRange SrcRange);
Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
void WarnAboutReturnGotoContinueOrBreakStmts(Stmt *S);
Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
Stmt *RewriteObjCCatchStmt(ObjCAtCatchStmt *S);
Stmt *RewriteObjCFinallyStmt(ObjCAtFinallyStmt *S);
Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
SourceLocation OrigEnd);
CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
Expr **args, unsigned nargs);
Stmt *SynthMessageExpr(ObjCMessageExpr *Exp);
Stmt *RewriteBreakStmt(BreakStmt *S);
Stmt *RewriteContinueStmt(ContinueStmt *S);
void SynthCountByEnumWithState(std::string &buf);
void SynthMsgSendFunctionDecl();
void SynthMsgSendSuperFunctionDecl();
void SynthMsgSendStretFunctionDecl();
void SynthMsgSendFpretFunctionDecl();
void SynthMsgSendSuperStretFunctionDecl();
void SynthGetClassFunctionDecl();
void SynthGetMetaClassFunctionDecl();
void SynthSelGetUidFunctionDecl();
void SynthGetProtocolFunctionDecl();
void SynthSuperContructorFunctionDecl();
// Metadata emission.
void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
std::string &Result);
void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
std::string &Result);
typedef ObjCCategoryImplDecl::instmeth_iterator instmeth_iterator;
void RewriteObjCMethodsMetaData(instmeth_iterator MethodBegin,
instmeth_iterator MethodEnd,
bool IsInstanceMethod,
const char *prefix,
const char *ClassName,
std::string &Result);
void RewriteObjCProtocolsMetaData(const ObjCList<ObjCProtocolDecl>
&Protocols,
const char *prefix,
const char *ClassName,
std::string &Result);
void SynthesizeObjCInternalStruct(ObjCInterfaceDecl *CDecl,
std::string &Result);
void SynthesizeIvarOffsetComputation(ObjCImplementationDecl *IDecl,
ObjCIvarDecl *ivar,
std::string &Result);
void RewriteImplementations();
void SynthesizeMetaDataIntoBuffer(std::string &Result);
// Block rewriting.
void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
// Block specific rewrite rules.
void RewriteBlockCall(CallExpr *Exp);
void RewriteBlockPointerDecl(NamedDecl *VD);
void RewriteBlockDeclRefExpr(BlockDeclRefExpr *VD);
void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
const char *funcName, std::string Tag);
std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
const char *funcName, std::string Tag);
std::string SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
bool hasCopyDisposeHelpers);
Stmt *SynthesizeBlockCall(CallExpr *Exp);
void SynthesizeBlockLiterals(SourceLocation FunLocStart,
const char *FunName);
void CollectBlockDeclRefInfo(BlockExpr *Exp);
void GetBlockCallExprs(Stmt *S);
void GetBlockDeclRefExprs(Stmt *S);
// We avoid calling Type::isBlockPointerType(), since it operates on the
// canonical type. We only care if the top-level type is a closure pointer.
bool isTopLevelBlockPointerType(QualType T) {
return isa<BlockPointerType>(T);
}
// FIXME: This predicate seems like it would be useful to add to ASTContext.
bool isObjCType(QualType T) {
if (!LangOpts.ObjC1 && !LangOpts.ObjC2)
return false;
QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
OCT == Context->getCanonicalType(Context->getObjCClassType()))
return true;
if (const PointerType *PT = OCT->getAsPointerType()) {
if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
isa<ObjCQualifiedIdType>(PT->getPointeeType()))
return true;
}
return false;
}
bool PointerTypeTakesAnyBlockArguments(QualType QT);
void GetExtentOfArgList(const char *Name, const char *&LParen,
const char *&RParen);
void RewriteCastExpr(CStyleCastExpr *CE);
FunctionDecl *SynthBlockInitFunctionDecl(const char *name);
Stmt *SynthBlockInitExpr(BlockExpr *Exp);
};
}
void RewriteObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
NamedDecl *D) {
if (FunctionProtoType *fproto = dyn_cast<FunctionProtoType>(funcType)) {
for (FunctionProtoType::arg_type_iterator I = fproto->arg_type_begin(),
E = fproto->arg_type_end(); I && (I != E); ++I)
if (isTopLevelBlockPointerType(*I)) {
// All the args are checked/rewritten. Don't call twice!
RewriteBlockPointerDecl(D);
break;
}
}
}
void RewriteObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
const PointerType *PT = funcType->getAsPointerType();
if (PT && PointerTypeTakesAnyBlockArguments(funcType))
RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
}
static bool IsHeaderFile(const std::string &Filename) {
std::string::size_type DotPos = Filename.rfind('.');
if (DotPos == std::string::npos) {
// no file extension
return false;
}
std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
// C header: .h
// C++ header: .hh or .H;
return Ext == "h" || Ext == "hh" || Ext == "H";
}
RewriteObjC::RewriteObjC(std::string inFile, std::string outFile,
Diagnostic &D, const LangOptions &LOpts)
: Diags(D), LangOpts(LOpts) {
IsHeader = IsHeaderFile(inFile);
InFileName = inFile;
OutFileName = outFile;
RewriteFailedDiag = Diags.getCustomDiagID(Diagnostic::Warning,
"rewriting sub-expression within a macro (may not be correct)");
TryFinallyContainsReturnDiag = Diags.getCustomDiagID(Diagnostic::Warning,
"rewriter doesn't support user-specified control flow semantics "
"for @try/@finally (code may not execute properly)");
}
ASTConsumer *clang::CreateCodeRewriterTest(const std::string& InFile,
const std::string& OutFile,
Diagnostic &Diags,
const LangOptions &LOpts) {
return new RewriteObjC(InFile, OutFile, Diags, LOpts);
}
void RewriteObjC::Initialize(ASTContext &context) {
Context = &context;
SM = &Context->getSourceManager();
TUDecl = Context->getTranslationUnitDecl();
MsgSendFunctionDecl = 0;
MsgSendSuperFunctionDecl = 0;
MsgSendStretFunctionDecl = 0;
MsgSendSuperStretFunctionDecl = 0;
MsgSendFpretFunctionDecl = 0;
GetClassFunctionDecl = 0;
GetMetaClassFunctionDecl = 0;
SelGetUidFunctionDecl = 0;
CFStringFunctionDecl = 0;
GetProtocolFunctionDecl = 0;
ConstantStringClassReference = 0;
NSStringRecord = 0;
CurMethodDef = 0;
CurFunctionDef = 0;
GlobalVarDecl = 0;
SuperStructDecl = 0;
ConstantStringDecl = 0;
BcLabelCount = 0;
SuperContructorFunctionDecl = 0;
NumObjCStringLiterals = 0;
PropParentMap = 0;
CurrentBody = 0;
DisableReplaceStmt = false;
// Get the ID and start/end of the main file.
MainFileID = SM->getMainFileID();
const llvm::MemoryBuffer *MainBuf = SM->getBuffer(MainFileID);
MainFileStart = MainBuf->getBufferStart();
MainFileEnd = MainBuf->getBufferEnd();
Rewrite.setSourceMgr(Context->getSourceManager());
// declaring objc_selector outside the parameter list removes a silly
// scope related warning...
if (IsHeader)
Preamble = "#pragma once\n";
Preamble += "struct objc_selector; struct objc_class;\n";
Preamble += "struct __rw_objc_super { struct objc_object *object; ";
Preamble += "struct objc_object *superClass; ";
if (LangOpts.Microsoft) {
// Add a constructor for creating temporary objects.
Preamble += "__rw_objc_super(struct objc_object *o, struct objc_object *s) "
": ";
Preamble += "object(o), superClass(s) {} ";
}
Preamble += "};\n";
Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
Preamble += "typedef struct objc_object Protocol;\n";
Preamble += "#define _REWRITER_typedef_Protocol\n";
Preamble += "#endif\n";
if (LangOpts.Microsoft) {
Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
} else
Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend_stret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper_stret";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT double objc_msgSend_fpret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getMetaClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_enter(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_exit(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_exception_extract(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT int objc_exception_match";
Preamble += "(struct objc_class *, struct objc_object *);\n";
// @synchronized hooks.
Preamble += "__OBJC_RW_DLLIMPORT void objc_sync_enter(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_sync_exit(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
Preamble += "struct __objcFastEnumerationState {\n\t";
Preamble += "unsigned long state;\n\t";
Preamble += "void **itemsPtr;\n\t";
Preamble += "unsigned long *mutationsPtr;\n\t";
Preamble += "unsigned long extra[5];\n};\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
Preamble += "#define __FASTENUMERATIONSTATE\n";
Preamble += "#endif\n";
Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
Preamble += "struct __NSConstantStringImpl {\n";
Preamble += " int *isa;\n";
Preamble += " int flags;\n";
Preamble += " char *str;\n";
Preamble += " long length;\n";
Preamble += "};\n";
Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
Preamble += "#else\n";
Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
Preamble += "#endif\n";
Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
Preamble += "#endif\n";
// Blocks preamble.
Preamble += "#ifndef BLOCK_IMPL\n";
Preamble += "#define BLOCK_IMPL\n";
Preamble += "struct __block_impl {\n";
Preamble += " void *isa;\n";
Preamble += " int Flags;\n";
Preamble += " int Size;\n";
Preamble += " void *FuncPtr;\n";
Preamble += "};\n";
Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
Preamble += "__OBJC_RW_STATICIMPORT void _Block_object_assign(void *, const void *, const int);\n";
Preamble += "__OBJC_RW_STATICIMPORT void _Block_object_dispose(const void *, const int);\n";
Preamble += "__OBJC_RW_STATICIMPORT void *_NSConcreteGlobalBlock[32];\n";
Preamble += "__OBJC_RW_STATICIMPORT void *_NSConcreteStackBlock[32];\n";
Preamble += "#endif\n";
if (LangOpts.Microsoft) {
Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
Preamble += "#define __attribute__(X)\n";
}
}
//===----------------------------------------------------------------------===//
// Top Level Driver Code
//===----------------------------------------------------------------------===//
void RewriteObjC::HandleTopLevelDecl(Decl *D) {
// Two cases: either the decl could be in the main file, or it could be in a
// #included file. If the former, rewrite it now. If the later, check to see
// if we rewrote the #include/#import.
SourceLocation Loc = D->getLocation();
Loc = SM->getInstantiationLoc(Loc);
// If this is for a builtin, ignore it.
if (Loc.isInvalid()) return;
// Look for built-in declarations that we need to refer during the rewrite.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
RewriteFunctionDecl(FD);
} else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
// declared in <Foundation/NSString.h>
if (strcmp(FVD->getNameAsCString(), "_NSConstantStringClassReference") == 0) {
ConstantStringClassReference = FVD;
return;
}
} else if (ObjCInterfaceDecl *MD = dyn_cast<ObjCInterfaceDecl>(D)) {
RewriteInterfaceDecl(MD);
} else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
RewriteCategoryDecl(CD);
} else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
RewriteProtocolDecl(PD);
} else if (ObjCForwardProtocolDecl *FP =
dyn_cast<ObjCForwardProtocolDecl>(D)){
RewriteForwardProtocolDecl(FP);
} else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
// Recurse into linkage specifications
for (DeclContext::decl_iterator DI = LSD->decls_begin(),
DIEnd = LSD->decls_end();
DI != DIEnd; ++DI)
HandleTopLevelDecl(*DI);
}
// If we have a decl in the main file, see if we should rewrite it.
if (SM->isFromMainFile(Loc))
return HandleDeclInMainFile(D);
}
//===----------------------------------------------------------------------===//
// Syntactic (non-AST) Rewriting Code
//===----------------------------------------------------------------------===//
void RewriteObjC::RewriteInclude() {
SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
std::pair<const char*, const char*> MainBuf = SM->getBufferData(MainFileID);
const char *MainBufStart = MainBuf.first;
const char *MainBufEnd = MainBuf.second;
size_t ImportLen = strlen("import");
size_t IncludeLen = strlen("include");
// Loop over the whole file, looking for includes.
for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
if (*BufPtr == '#') {
if (++BufPtr == MainBufEnd)
return;
while (*BufPtr == ' ' || *BufPtr == '\t')
if (++BufPtr == MainBufEnd)
return;
if (!strncmp(BufPtr, "import", ImportLen)) {
// replace import with include
SourceLocation ImportLoc =
LocStart.getFileLocWithOffset(BufPtr-MainBufStart);
ReplaceText(ImportLoc, ImportLen, "include", IncludeLen);
BufPtr += ImportLen;
}
}
}
}
void RewriteObjC::RewriteTabs() {
std::pair<const char*, const char*> MainBuf = SM->getBufferData(MainFileID);
const char *MainBufStart = MainBuf.first;
const char *MainBufEnd = MainBuf.second;
// Loop over the whole file, looking for tabs.
for (const char *BufPtr = MainBufStart; BufPtr != MainBufEnd; ++BufPtr) {
if (*BufPtr != '\t')
continue;
// Okay, we found a tab. This tab will turn into at least one character,
// but it depends on which 'virtual column' it is in. Compute that now.
unsigned VCol = 0;
while (BufPtr-VCol != MainBufStart && BufPtr[-VCol-1] != '\t' &&
BufPtr[-VCol-1] != '\n' && BufPtr[-VCol-1] != '\r')
++VCol;
// Okay, now that we know the virtual column, we know how many spaces to
// insert. We assume 8-character tab-stops.
unsigned Spaces = 8-(VCol & 7);
// Get the location of the tab.
SourceLocation TabLoc = SM->getLocForStartOfFile(MainFileID);
TabLoc = TabLoc.getFileLocWithOffset(BufPtr-MainBufStart);
// Rewrite the single tab character into a sequence of spaces.
ReplaceText(TabLoc, 1, " ", Spaces);
}
}
static std::string getIvarAccessString(ObjCInterfaceDecl *ClassDecl,
ObjCIvarDecl *OID) {
std::string S;
S = "((struct ";
S += ClassDecl->getIdentifier()->getName();
S += "_IMPL *)self)->";
S += OID->getNameAsCString();
return S;
}
void RewriteObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
ObjCImplementationDecl *IMD,
ObjCCategoryImplDecl *CID) {
SourceLocation startLoc = PID->getLocStart();
InsertText(startLoc, "// ", 3);
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @synthesize location");
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "@synthesize: can't find ';'");
SourceLocation onePastSemiLoc =
startLoc.getFileLocWithOffset(semiBuf-startBuf+1);
if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
return; // FIXME: is this correct?
// Generate the 'getter' function.
ObjCPropertyDecl *PD = PID->getPropertyDecl();
ObjCInterfaceDecl *ClassDecl = PD->getGetterMethodDecl()->getClassInterface();
ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
if (!OID)
return;
std::string Getr;
RewriteObjCMethodDecl(PD->getGetterMethodDecl(), Getr);
Getr += "{ ";
// Synthesize an explicit cast to gain access to the ivar.
// FIXME: deal with code generation implications for various property
// attributes (copy, retain, nonatomic).
// See objc-act.c:objc_synthesize_new_getter() for details.
Getr += "return " + getIvarAccessString(ClassDecl, OID);
Getr += "; }";
InsertText(onePastSemiLoc, Getr.c_str(), Getr.size());
// Add the rewritten getter to trigger meta data generation. An alternate, and
// possibly cleaner approach is to hack RewriteObjCMethodsMetaData() to deal
// with properties explicitly. The following addInstanceMethod() required far
// less code change (and actually models what the rewriter is doing).
if (IMD)
IMD->addInstanceMethod(PD->getGetterMethodDecl());
else
CID->addInstanceMethod(PD->getGetterMethodDecl());
if (PD->isReadOnly())
return;
// Generate the 'setter' function.
std::string Setr;
RewriteObjCMethodDecl(PD->getSetterMethodDecl(), Setr);
Setr += "{ ";
// Synthesize an explicit cast to initialize the ivar.
// FIXME: deal with code generation implications for various property
// attributes (copy, retain, nonatomic).
// See objc-act.c:objc_synthesize_new_setter() for details.
Setr += getIvarAccessString(ClassDecl, OID) + " = ";
Setr += PD->getNameAsCString();
Setr += "; }";
InsertText(onePastSemiLoc, Setr.c_str(), Setr.size());
// Add the rewritten setter to trigger meta data generation.
if (IMD)
IMD->addInstanceMethod(PD->getSetterMethodDecl());
else
CID->addInstanceMethod(PD->getSetterMethodDecl());
}
void RewriteObjC::RewriteForwardClassDecl(ObjCClassDecl *ClassDecl) {
// Get the start location and compute the semi location.
SourceLocation startLoc = ClassDecl->getLocation();
const char *startBuf = SM->getCharacterData(startLoc);
const char *semiPtr = strchr(startBuf, ';');
// Translate to typedef's that forward reference structs with the same name
// as the class. As a convenience, we include the original declaration
// as a comment.
std::string typedefString;
typedefString += "// ";
typedefString.append(startBuf, semiPtr-startBuf+1);
typedefString += "\n";
for (ObjCClassDecl::iterator I = ClassDecl->begin(), E = ClassDecl->end();
I != E; ++I) {
ObjCInterfaceDecl *ForwardDecl = *I;
typedefString += "#ifndef _REWRITER_typedef_";
typedefString += ForwardDecl->getNameAsString();
typedefString += "\n";
typedefString += "#define _REWRITER_typedef_";
typedefString += ForwardDecl->getNameAsString();
typedefString += "\n";
typedefString += "typedef struct objc_object ";
typedefString += ForwardDecl->getNameAsString();
typedefString += ";\n#endif\n";
}
// Replace the @class with typedefs corresponding to the classes.
ReplaceText(startLoc, semiPtr-startBuf+1,
typedefString.c_str(), typedefString.size());
}
void RewriteObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
SourceLocation LocStart = Method->getLocStart();
SourceLocation LocEnd = Method->getLocEnd();
if (SM->getInstantiationLineNumber(LocEnd) >
SM->getInstantiationLineNumber(LocStart)) {
InsertText(LocStart, "#if 0\n", 6);
ReplaceText(LocEnd, 1, ";\n#endif\n", 9);
} else {
InsertText(LocStart, "// ", 3);
}
}
void RewriteObjC::RewriteProperty(ObjCPropertyDecl *prop)
{
SourceLocation Loc = prop->getLocation();
ReplaceText(Loc, 0, "// ", 3);
// FIXME: handle properties that are declared across multiple lines.
}
void RewriteObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
SourceLocation LocStart = CatDecl->getLocStart();
// FIXME: handle category headers that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ", 3);
for (ObjCCategoryDecl::instmeth_iterator I = CatDecl->instmeth_begin(),
E = CatDecl->instmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
for (ObjCCategoryDecl::classmeth_iterator I = CatDecl->classmeth_begin(),
E = CatDecl->classmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
// Lastly, comment out the @end.
ReplaceText(CatDecl->getAtEndLoc(), 0, "// ", 3);
}
void RewriteObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
std::pair<const char*, const char*> MainBuf = SM->getBufferData(MainFileID);
SourceLocation LocStart = PDecl->getLocStart();
// FIXME: handle protocol headers that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ", 3);
for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
E = PDecl->instmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
for (ObjCProtocolDecl::classmeth_iterator I = PDecl->classmeth_begin(),
E = PDecl->classmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
// Lastly, comment out the @end.
SourceLocation LocEnd = PDecl->getAtEndLoc();
ReplaceText(LocEnd, 0, "// ", 3);
// Must comment out @optional/@required
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
for (const char *p = startBuf; p < endBuf; p++) {
if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
std::string CommentedOptional = "/* @optional */";
SourceLocation OptionalLoc = LocStart.getFileLocWithOffset(p-startBuf);
ReplaceText(OptionalLoc, strlen("@optional"),
CommentedOptional.c_str(), CommentedOptional.size());
}
else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
std::string CommentedRequired = "/* @required */";
SourceLocation OptionalLoc = LocStart.getFileLocWithOffset(p-startBuf);
ReplaceText(OptionalLoc, strlen("@required"),
CommentedRequired.c_str(), CommentedRequired.size());
}
}
}
void RewriteObjC::RewriteForwardProtocolDecl(ObjCForwardProtocolDecl *PDecl) {
SourceLocation LocStart = PDecl->getLocation();
if (LocStart.isInvalid())
assert(false && "Invalid SourceLocation");
// FIXME: handle forward protocol that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ", 3);
}
void RewriteObjC::RewriteObjCMethodDecl(ObjCMethodDecl *OMD,
std::string &ResultStr) {
//fprintf(stderr,"In RewriteObjCMethodDecl\n");
const FunctionType *FPRetType = 0;
ResultStr += "\nstatic ";
if (OMD->getResultType()->isObjCQualifiedIdType())
ResultStr += "id";
else if (OMD->getResultType()->isFunctionPointerType() ||
OMD->getResultType()->isBlockPointerType()) {
// needs special handling, since pointer-to-functions have special
// syntax (where a decaration models use).
QualType retType = OMD->getResultType();
QualType PointeeTy;
if (const PointerType* PT = retType->getAsPointerType())
PointeeTy = PT->getPointeeType();
else if (const BlockPointerType *BPT = retType->getAsBlockPointerType())
PointeeTy = BPT->getPointeeType();
if ((FPRetType = PointeeTy->getAsFunctionType())) {
ResultStr += FPRetType->getResultType().getAsString();
ResultStr += "(*";
}
} else
ResultStr += OMD->getResultType().getAsString();
ResultStr += " ";
// Unique method name
std::string NameStr;
if (OMD->isInstanceMethod())
NameStr += "_I_";
else
NameStr += "_C_";
NameStr += OMD->getClassInterface()->getNameAsString();
NameStr += "_";
if (ObjCCategoryImplDecl *CID =
dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
NameStr += CID->getNameAsString();
NameStr += "_";
}
// Append selector names, replacing ':' with '_'
{
std::string selString = OMD->getSelector().getAsString();
int len = selString.size();
for (int i = 0; i < len; i++)
if (selString[i] == ':')
selString[i] = '_';
NameStr += selString;
}
// Remember this name for metadata emission
MethodInternalNames[OMD] = NameStr;
ResultStr += NameStr;
// Rewrite arguments
ResultStr += "(";
// invisible arguments
if (OMD->isInstanceMethod()) {
QualType selfTy = Context->getObjCInterfaceType(OMD->getClassInterface());
selfTy = Context->getPointerType(selfTy);
if (!LangOpts.Microsoft) {
if (ObjCSynthesizedStructs.count(OMD->getClassInterface()))
ResultStr += "struct ";
}
// When rewriting for Microsoft, explicitly omit the structure name.
ResultStr += OMD->getClassInterface()->getNameAsString();
ResultStr += " *";
}
else
ResultStr += Context->getObjCIdType().getAsString();
ResultStr += " self, ";
ResultStr += Context->getObjCSelType().getAsString();
ResultStr += " _cmd";
// Method arguments.
for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
E = OMD->param_end(); PI != E; ++PI) {
ParmVarDecl *PDecl = *PI;
ResultStr += ", ";
if (PDecl->getType()->isObjCQualifiedIdType()) {
ResultStr += "id ";
ResultStr += PDecl->getNameAsString();
} else {
std::string Name = PDecl->getNameAsString();
if (isTopLevelBlockPointerType(PDecl->getType())) {
// Make sure we convert "t (^)(...)" to "t (*)(...)".
const BlockPointerType *BPT = PDecl->getType()->getAsBlockPointerType();
Context->getPointerType(BPT->getPointeeType()).getAsStringInternal(Name);
} else
PDecl->getType().getAsStringInternal(Name);
ResultStr += Name;
}
}
if (OMD->isVariadic())
ResultStr += ", ...";
ResultStr += ") ";
if (FPRetType) {
ResultStr += ")"; // close the precedence "scope" for "*".
// Now, emit the argument types (if any).
if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
ResultStr += "(";
for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
if (i) ResultStr += ", ";
std::string ParamStr = FT->getArgType(i).getAsString();
ResultStr += ParamStr;
}
if (FT->isVariadic()) {
if (FT->getNumArgs()) ResultStr += ", ";
ResultStr += "...";
}
ResultStr += ")";
} else {
ResultStr += "()";
}
}
}
void RewriteObjC::RewriteImplementationDecl(Decl *OID) {
ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
if (IMD)
InsertText(IMD->getLocStart(), "// ", 3);
else
InsertText(CID->getLocStart(), "// ", 3);
for (ObjCCategoryImplDecl::instmeth_iterator
I = IMD ? IMD->instmeth_begin() : CID->instmeth_begin(),
E = IMD ? IMD->instmeth_end() : CID->instmeth_end(); I != E; ++I) {
std::string ResultStr;
ObjCMethodDecl *OMD = *I;
RewriteObjCMethodDecl(OMD, ResultStr);
SourceLocation LocStart = OMD->getLocStart();
SourceLocation LocEnd = OMD->getBody()->getLocStart();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
ReplaceText(LocStart, endBuf-startBuf,
ResultStr.c_str(), ResultStr.size());
}
for (ObjCCategoryImplDecl::classmeth_iterator
I = IMD ? IMD->classmeth_begin() : CID->classmeth_begin(),
E = IMD ? IMD->classmeth_end() : CID->classmeth_end(); I != E; ++I) {
std::string ResultStr;
ObjCMethodDecl *OMD = *I;
RewriteObjCMethodDecl(OMD, ResultStr);
SourceLocation LocStart = OMD->getLocStart();
SourceLocation LocEnd = OMD->getBody()->getLocStart();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
ReplaceText(LocStart, endBuf-startBuf,
ResultStr.c_str(), ResultStr.size());
}
for (ObjCCategoryImplDecl::propimpl_iterator
I = IMD ? IMD->propimpl_begin() : CID->propimpl_begin(),
E = IMD ? IMD->propimpl_end() : CID->propimpl_end(); I != E; ++I) {
RewritePropertyImplDecl(*I, IMD, CID);
}
if (IMD)
InsertText(IMD->getLocEnd(), "// ", 3);
else
InsertText(CID->getLocEnd(), "// ", 3);
}
void RewriteObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
std::string ResultStr;
if (!ObjCForwardDecls.count(ClassDecl)) {
// we haven't seen a forward decl - generate a typedef.
ResultStr = "#ifndef _REWRITER_typedef_";
ResultStr += ClassDecl->getNameAsString();
ResultStr += "\n";
ResultStr += "#define _REWRITER_typedef_";
ResultStr += ClassDecl->getNameAsString();
ResultStr += "\n";
ResultStr += "typedef struct objc_object ";
ResultStr += ClassDecl->getNameAsString();
ResultStr += ";\n#endif\n";
// Mark this typedef as having been generated.
ObjCForwardDecls.insert(ClassDecl);
}
SynthesizeObjCInternalStruct(ClassDecl, ResultStr);
for (ObjCInterfaceDecl::prop_iterator I = ClassDecl->prop_begin(),
E = ClassDecl->prop_end(); I != E; ++I)
RewriteProperty(*I);
for (ObjCInterfaceDecl::instmeth_iterator I = ClassDecl->instmeth_begin(),
E = ClassDecl->instmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
for (ObjCInterfaceDecl::classmeth_iterator I = ClassDecl->classmeth_begin(),
E = ClassDecl->classmeth_end(); I != E; ++I)
RewriteMethodDeclaration(*I);
// Lastly, comment out the @end.
ReplaceText(ClassDecl->getAtEndLoc(), 0, "// ", 3);
}
Stmt *RewriteObjC::RewritePropertySetter(BinaryOperator *BinOp, Expr *newStmt,
SourceRange SrcRange) {
// Synthesize a ObjCMessageExpr from a ObjCPropertyRefExpr.
// This allows us to reuse all the fun and games in SynthMessageExpr().
ObjCPropertyRefExpr *PropRefExpr = dyn_cast<ObjCPropertyRefExpr>(BinOp->getLHS());
ObjCMessageExpr *MsgExpr;
ObjCPropertyDecl *PDecl = PropRefExpr->getProperty();
llvm::SmallVector<Expr *, 1> ExprVec;
ExprVec.push_back(newStmt);
Stmt *Receiver = PropRefExpr->getBase();
ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(Receiver);
if (PRE && PropGetters[PRE]) {
// This allows us to handle chain/nested property getters.
Receiver = PropGetters[PRE];
}
MsgExpr = new (Context) ObjCMessageExpr(dyn_cast<Expr>(Receiver),
PDecl->getSetterName(), PDecl->getType(),
PDecl->getSetterMethodDecl(),
SourceLocation(), SourceLocation(),
&ExprVec[0], 1);
Stmt *ReplacingStmt = SynthMessageExpr(MsgExpr);
// Now do the actual rewrite.
ReplaceStmtWithRange(BinOp, ReplacingStmt, SrcRange);
//delete BinOp;
// NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
// to things that stay around.
Context->Deallocate(MsgExpr);
return ReplacingStmt;
}
Stmt *RewriteObjC::RewritePropertyGetter(ObjCPropertyRefExpr *PropRefExpr) {
// Synthesize a ObjCMessageExpr from a ObjCPropertyRefExpr.
// This allows us to reuse all the fun and games in SynthMessageExpr().
ObjCMessageExpr *MsgExpr;
ObjCPropertyDecl *PDecl = PropRefExpr->getProperty();
Stmt *Receiver = PropRefExpr->getBase();
ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(Receiver);
if (PRE && PropGetters[PRE]) {
// This allows us to handle chain/nested property getters.
Receiver = PropGetters[PRE];
}
MsgExpr = new (Context) ObjCMessageExpr(dyn_cast<Expr>(Receiver),
PDecl->getGetterName(), PDecl->getType(),
PDecl->getGetterMethodDecl(),
SourceLocation(), SourceLocation(),
0, 0);
Stmt *ReplacingStmt = SynthMessageExpr(MsgExpr);
if (!PropParentMap)
PropParentMap = new ParentMap(CurrentBody);
Stmt *Parent = PropParentMap->getParent(PropRefExpr);
if (Parent && isa<ObjCPropertyRefExpr>(Parent)) {
// We stash away the ReplacingStmt since actually doing the
// replacement/rewrite won't work for nested getters (e.g. obj.p.i)
PropGetters[PropRefExpr] = ReplacingStmt;
// NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
// to things that stay around.
Context->Deallocate(MsgExpr);
return PropRefExpr; // return the original...
} else {
ReplaceStmt(PropRefExpr, ReplacingStmt);
// delete PropRefExpr; elsewhere...
// NOTE: We don't want to call MsgExpr->Destroy(), as it holds references
// to things that stay around.
Context->Deallocate(MsgExpr);
return ReplacingStmt;
}
}
Stmt *RewriteObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV,
SourceLocation OrigStart) {
ObjCIvarDecl *D = IV->getDecl();
if (CurMethodDef) {
if (const PointerType *pType = IV->getBase()->getType()->getAsPointerType()) {
ObjCInterfaceType *iFaceDecl =
dyn_cast<ObjCInterfaceType>(pType->getPointeeType());
// lookup which class implements the instance variable.
ObjCInterfaceDecl *clsDeclared = 0;
iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(), clsDeclared);
assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
// Synthesize an explicit cast to gain access to the ivar.
std::string RecName = clsDeclared->getIdentifier()->getName();
RecName += "_IMPL";
IdentifierInfo *II = &Context->Idents.get(RecName.c_str());
RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(), II);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = new (Context) CStyleCastExpr(castT, IV->getBase(),
castT,SourceLocation(),
SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(IV->getBase()->getLocStart(),
IV->getBase()->getLocEnd(),
castExpr);
if (IV->isFreeIvar() &&
CurMethodDef->getClassInterface() == iFaceDecl->getDecl()) {
MemberExpr *ME = new (Context) MemberExpr(PE, true, D,
IV->getLocation(),
D->getType());
ReplaceStmt(IV, ME);
// delete IV; leak for now, see RewritePropertySetter() usage for more info.
return ME;
}
ReplaceStmt(IV->getBase(), PE);
// Cannot delete IV->getBase(), since PE points to it.
// Replace the old base with the cast. This is important when doing
// embedded rewrites. For example, [newInv->_container addObject:0].
IV->setBase(PE);
return IV;
}
} else { // we are outside a method.
assert(!IV->isFreeIvar() && "Cannot have a free standing ivar outside a method");
// Explicit ivar refs need to have a cast inserted.
// FIXME: consider sharing some of this code with the code above.
if (const PointerType *pType = IV->getBase()->getType()->getAsPointerType()) {
ObjCInterfaceType *iFaceDecl = dyn_cast<ObjCInterfaceType>(pType->getPointeeType());
// lookup which class implements the instance variable.
ObjCInterfaceDecl *clsDeclared = 0;
iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(), clsDeclared);
assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
// Synthesize an explicit cast to gain access to the ivar.
std::string RecName = clsDeclared->getIdentifier()->getName();
RecName += "_IMPL";
IdentifierInfo *II = &Context->Idents.get(RecName.c_str());
RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(), II);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = new (Context) CStyleCastExpr(castT, IV->getBase(),
castT, SourceLocation(),
SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(IV->getBase()->getLocStart(),
IV->getBase()->getLocEnd(), castExpr);
ReplaceStmt(IV->getBase(), PE);
// Cannot delete IV->getBase(), since PE points to it.
// Replace the old base with the cast. This is important when doing
// embedded rewrites. For example, [newInv->_container addObject:0].
IV->setBase(PE);
return IV;
}
}
return IV;
}
/// SynthCountByEnumWithState - To print:
/// ((unsigned int (*)
/// (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
/// (void *)objc_msgSend)((id)l_collection,
/// sel_registerName(
/// "countByEnumeratingWithState:objects:count:"),
/// &enumState,
/// (id *)items, (unsigned int)16)
///
void RewriteObjC::SynthCountByEnumWithState(std::string &buf) {
buf += "((unsigned int (*) (id, SEL, struct __objcFastEnumerationState *, "
"id *, unsigned int))(void *)objc_msgSend)";
buf += "\n\t\t";
buf += "((id)l_collection,\n\t\t";
buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
buf += "\n\t\t";
buf += "&enumState, "
"(id *)items, (unsigned int)16)";
}
/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
/// statement to exit to its outer synthesized loop.
///
Stmt *RewriteObjC::RewriteBreakStmt(BreakStmt *S) {
if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
return S;
// replace break with goto __break_label
std::string buf;
SourceLocation startLoc = S->getLocStart();
buf = "goto __break_label_";
buf += utostr(ObjCBcLabelNo.back());
ReplaceText(startLoc, strlen("break"), buf.c_str(), buf.size());
return 0;
}
/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
/// statement to continue with its inner synthesized loop.
///
Stmt *RewriteObjC::RewriteContinueStmt(ContinueStmt *S) {
if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
return S;
// replace continue with goto __continue_label
std::string buf;
SourceLocation startLoc = S->getLocStart();
buf = "goto __continue_label_";
buf += utostr(ObjCBcLabelNo.back());
ReplaceText(startLoc, strlen("continue"), buf.c_str(), buf.size());
return 0;
}
/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
/// It rewrites:
/// for ( type elem in collection) { stmts; }
/// Into:
/// {
/// type elem;
/// struct __objcFastEnumerationState enumState = { 0 };
/// id items[16];
/// id l_collection = (id)collection;
/// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:items count:16];
/// if (limit) {
/// unsigned long startMutations = *enumState.mutationsPtr;
/// do {
/// unsigned long counter = 0;
/// do {
/// if (startMutations != *enumState.mutationsPtr)
/// objc_enumerationMutation(l_collection);
/// elem = (type)enumState.itemsPtr[counter++];
/// stmts;
/// __continue_label: ;
/// } while (counter < limit);
/// } while (limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:items count:16]);
/// elem = nil;
/// __break_label: ;
/// }
/// else
/// elem = nil;
/// }
///
Stmt *RewriteObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
SourceLocation OrigEnd) {
assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
"ObjCForCollectionStmt Statement stack mismatch");
assert(!ObjCBcLabelNo.empty() &&
"ObjCForCollectionStmt - Label No stack empty");
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
const char *elementName;
std::string elementTypeAsString;
std::string buf;
buf = "\n{\n\t";
if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
// type elem;
NamedDecl* D = cast<NamedDecl>(DS->getSolitaryDecl());
QualType ElementType = cast<ValueDecl>(D)->getType();
elementTypeAsString = ElementType.getAsString();
buf += elementTypeAsString;
buf += " ";
elementName = D->getNameAsCString();
buf += elementName;
buf += ";\n\t";
}
else {
DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
elementName = DR->getDecl()->getNameAsCString();
elementTypeAsString
= cast<ValueDecl>(DR->getDecl())->getType().getAsString();
}
// struct __objcFastEnumerationState enumState = { 0 };
buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
// id items[16];
buf += "id items[16];\n\t";
// id l_collection = (id)
buf += "id l_collection = (id)";
// Find start location of 'collection' the hard way!
const char *startCollectionBuf = startBuf;
startCollectionBuf += 3; // skip 'for'
startCollectionBuf = strchr(startCollectionBuf, '(');
startCollectionBuf++; // skip '('
// find 'in' and skip it.
while (*startCollectionBuf != ' ' ||
*(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
(*(startCollectionBuf+3) != ' ' &&
*(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
startCollectionBuf++;
startCollectionBuf += 3;
// Replace: "for (type element in" with string constructed thus far.
ReplaceText(startLoc, startCollectionBuf - startBuf,
buf.c_str(), buf.size());
// Replace ')' in for '(' type elem in collection ')' with ';'
SourceLocation rightParenLoc = S->getRParenLoc();
const char *rparenBuf = SM->getCharacterData(rightParenLoc);
SourceLocation lparenLoc = startLoc.getFileLocWithOffset(rparenBuf-startBuf);
buf = ";\n\t";
// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
// objects:items count:16];
// which is synthesized into:
// unsigned int limit =
// ((unsigned int (*)
// (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
// (void *)objc_msgSend)((id)l_collection,
// sel_registerName(
// "countByEnumeratingWithState:objects:count:"),
// (struct __objcFastEnumerationState *)&state,
// (id *)items, (unsigned int)16);
buf += "unsigned long limit =\n\t\t";
SynthCountByEnumWithState(buf);
buf += ";\n\t";
/// if (limit) {
/// unsigned long startMutations = *enumState.mutationsPtr;
/// do {
/// unsigned long counter = 0;
/// do {
/// if (startMutations != *enumState.mutationsPtr)
/// objc_enumerationMutation(l_collection);
/// elem = (type)enumState.itemsPtr[counter++];
buf += "if (limit) {\n\t";
buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
buf += "do {\n\t\t";
buf += "unsigned long counter = 0;\n\t\t";
buf += "do {\n\t\t\t";
buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
buf += elementName;
buf += " = (";
buf += elementTypeAsString;
buf += ")enumState.itemsPtr[counter++];";
// Replace ')' in for '(' type elem in collection ')' with all of these.
ReplaceText(lparenLoc, 1, buf.c_str(), buf.size());
/// __continue_label: ;
/// } while (counter < limit);
/// } while (limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:items count:16]);
/// elem = nil;
/// __break_label: ;
/// }
/// else
/// elem = nil;
/// }
///
buf = ";\n\t";
buf += "__continue_label_";
buf += utostr(ObjCBcLabelNo.back());
buf += ": ;";
buf += "\n\t\t";
buf += "} while (counter < limit);\n\t";
buf += "} while (limit = ";
SynthCountByEnumWithState(buf);
buf += ");\n\t";
buf += elementName;
buf += " = ((id)0);\n\t";
buf += "__break_label_";
buf += utostr(ObjCBcLabelNo.back());
buf += ": ;\n\t";
buf += "}\n\t";
buf += "else\n\t\t";
buf += elementName;
buf += " = ((id)0);\n";
buf += "}\n";
// Insert all these *after* the statement body.
if (isa<CompoundStmt>(S->getBody())) {
SourceLocation endBodyLoc = OrigEnd.getFileLocWithOffset(1);
InsertText(endBodyLoc, buf.c_str(), buf.size());
} else {
/* Need to treat single statements specially. For example:
*
* for (A *a in b) if (stuff()) break;
* for (A *a in b) xxxyy;
*
* The following code simply scans ahead to the semi to find the actual end.
*/
const char *stmtBuf = SM->getCharacterData(OrigEnd);
const char *semiBuf = strchr(stmtBuf, ';');
assert(semiBuf && "Can't find ';'");
SourceLocation endBodyLoc = OrigEnd.getFileLocWithOffset(semiBuf-stmtBuf+1);
InsertText(endBodyLoc, buf.c_str(), buf.size());
}
Stmts.pop_back();
ObjCBcLabelNo.pop_back();
return 0;
}
/// RewriteObjCSynchronizedStmt -
/// This routine rewrites @synchronized(expr) stmt;
/// into:
/// objc_sync_enter(expr);
/// @try stmt @finally { objc_sync_exit(expr); }
///
Stmt *RewriteObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @synchronized location");
std::string buf;
buf = "objc_sync_enter((id)";
const char *lparenBuf = startBuf;
while (*lparenBuf != '(') lparenBuf++;
ReplaceText(startLoc, lparenBuf-startBuf+1, buf.c_str(), buf.size());
// We can't use S->getSynchExpr()->getLocEnd() to find the end location, since
// the sync expression is typically a message expression that's already
// been rewritten! (which implies the SourceLocation's are invalid).
SourceLocation endLoc = S->getSynchBody()->getLocStart();
const char *endBuf = SM->getCharacterData(endLoc);
while (*endBuf != ')') endBuf--;
SourceLocation rparenLoc = startLoc.getFileLocWithOffset(endBuf-startBuf);
buf = ");\n";
// declare a new scope with two variables, _stack and _rethrow.
buf += "/* @try scope begin */ \n{ struct _objc_exception_data {\n";
buf += "int buf[18/*32-bit i386*/];\n";
buf += "char *pointers[4];} _stack;\n";
buf += "id volatile _rethrow = 0;\n";
buf += "objc_exception_try_enter(&_stack);\n";
buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
ReplaceText(rparenLoc, 1, buf.c_str(), buf.size());
startLoc = S->getSynchBody()->getLocEnd();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '}') && "bogus @synchronized block");
SourceLocation lastCurlyLoc = startLoc;
buf = "}\nelse {\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
buf += " objc_sync_exit(";
Expr *syncExpr = new (Context) CStyleCastExpr(Context->getObjCIdType(),
S->getSynchExpr(),
Context->getObjCIdType(),
SourceLocation(),
SourceLocation());
std::string syncExprBufS;
llvm::raw_string_ostream syncExprBuf(syncExprBufS);
syncExpr->printPretty(syncExprBuf);
buf += syncExprBuf.str();
buf += ");\n";
buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
buf += "}\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf.c_str(), buf.size());
return 0;
}
void RewriteObjC::WarnAboutReturnGotoContinueOrBreakStmts(Stmt *S) {
// Perform a bottom up traversal of all children.
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end();
CI != E; ++CI)
if (*CI)
WarnAboutReturnGotoContinueOrBreakStmts(*CI);
if (isa<ReturnStmt>(S) || isa<ContinueStmt>(S) ||
isa<BreakStmt>(S) || isa<GotoStmt>(S)) {
Diags.Report(Context->getFullLoc(S->getLocStart()),
TryFinallyContainsReturnDiag);
}
return;
}
Stmt *RewriteObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @try location");
std::string buf;
// declare a new scope with two variables, _stack and _rethrow.
buf = "/* @try scope begin */ { struct _objc_exception_data {\n";
buf += "int buf[18/*32-bit i386*/];\n";
buf += "char *pointers[4];} _stack;\n";
buf += "id volatile _rethrow = 0;\n";
buf += "objc_exception_try_enter(&_stack);\n";
buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
ReplaceText(startLoc, 4, buf.c_str(), buf.size());
startLoc = S->getTryBody()->getLocEnd();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '}') && "bogus @try block");
SourceLocation lastCurlyLoc = startLoc;
ObjCAtCatchStmt *catchList = S->getCatchStmts();
if (catchList) {
startLoc = startLoc.getFileLocWithOffset(1);
buf = " /* @catch begin */ else {\n";
buf += " id _caught = objc_exception_extract(&_stack);\n";
buf += " objc_exception_try_enter (&_stack);\n";
buf += " if (_setjmp(_stack.buf))\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += " else { /* @catch continue */";
InsertText(startLoc, buf.c_str(), buf.size());
} else { /* no catch list */
buf = "}\nelse {\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf.c_str(), buf.size());
}
bool sawIdTypedCatch = false;
Stmt *lastCatchBody = 0;
while (catchList) {
Stmt *catchStmt = catchList->getCatchParamStmt();
if (catchList == S->getCatchStmts())
buf = "if ("; // we are generating code for the first catch clause
else
buf = "else if (";
startLoc = catchList->getLocStart();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @catch location");
const char *lParenLoc = strchr(startBuf, '(');
if (catchList->hasEllipsis()) {
// Now rewrite the body...
lastCatchBody = catchList->getCatchBody();
SourceLocation bodyLoc = lastCatchBody->getLocStart();
const char *bodyBuf = SM->getCharacterData(bodyLoc);
assert(*SM->getCharacterData(catchList->getRParenLoc()) == ')' &&
"bogus @catch paren location");
assert((*bodyBuf == '{') && "bogus @catch body location");
buf += "1) { id _tmp = _caught;";
Rewrite.ReplaceText(startLoc, bodyBuf-startBuf+1,
buf.c_str(), buf.size());
} else if (DeclStmt *declStmt = dyn_cast<DeclStmt>(catchStmt)) {
QualType t = dyn_cast<ValueDecl>(declStmt->getSolitaryDecl())->getType();
if (t == Context->getObjCIdType()) {
buf += "1) { ";
ReplaceText(startLoc, lParenLoc-startBuf+1, buf.c_str(), buf.size());
sawIdTypedCatch = true;
} else if (const PointerType *pType = t->getAsPointerType()) {
ObjCInterfaceType *cls; // Should be a pointer to a class.
cls = dyn_cast<ObjCInterfaceType>(pType->getPointeeType().getTypePtr());
if (cls) {
buf += "objc_exception_match((struct objc_class *)objc_getClass(\"";
buf += cls->getDecl()->getNameAsString();
buf += "\"), (struct objc_object *)_caught)) { ";
ReplaceText(startLoc, lParenLoc-startBuf+1, buf.c_str(), buf.size());
}
}
// Now rewrite the body...
lastCatchBody = catchList->getCatchBody();
SourceLocation rParenLoc = catchList->getRParenLoc();
SourceLocation bodyLoc = lastCatchBody->getLocStart();
const char *bodyBuf = SM->getCharacterData(bodyLoc);
const char *rParenBuf = SM->getCharacterData(rParenLoc);
assert((*rParenBuf == ')') && "bogus @catch paren location");
assert((*bodyBuf == '{') && "bogus @catch body location");
buf = " = _caught;";
// Here we replace ") {" with "= _caught;" (which initializes and
// declares the @catch parameter).
ReplaceText(rParenLoc, bodyBuf-rParenBuf+1, buf.c_str(), buf.size());
} else if (!isa<NullStmt>(catchStmt)) {
assert(false && "@catch rewrite bug");
}
// make sure all the catch bodies get rewritten!
catchList = catchList->getNextCatchStmt();
}
// Complete the catch list...
if (lastCatchBody) {
SourceLocation bodyLoc = lastCatchBody->getLocEnd();
assert(*SM->getCharacterData(bodyLoc) == '}' &&
"bogus @catch body location");
// Insert the last (implicit) else clause *before* the right curly brace.
bodyLoc = bodyLoc.getFileLocWithOffset(-1);
buf = "} /* last catch end */\n";
buf += "else {\n";
buf += " _rethrow = _caught;\n";
buf += " objc_exception_try_exit(&_stack);\n";
buf += "} } /* @catch end */\n";
if (!S->getFinallyStmt())
buf += "}\n";
InsertText(bodyLoc, buf.c_str(), buf.size());
// Set lastCurlyLoc
lastCurlyLoc = lastCatchBody->getLocEnd();
}
if (ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt()) {
startLoc = finalStmt->getLocStart();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @finally start");
buf = "/* @finally */";
ReplaceText(startLoc, 8, buf.c_str(), buf.size());
Stmt *body = finalStmt->getFinallyBody();
SourceLocation startLoc = body->getLocStart();
SourceLocation endLoc = body->getLocEnd();
assert(*SM->getCharacterData(startLoc) == '{' &&
"bogus @finally body location");
assert(*SM->getCharacterData(endLoc) == '}' &&
"bogus @finally body location");
startLoc = startLoc.getFileLocWithOffset(1);
buf = " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
InsertText(startLoc, buf.c_str(), buf.size());
endLoc = endLoc.getFileLocWithOffset(-1);
buf = " if (_rethrow) objc_exception_throw(_rethrow);\n";
InsertText(endLoc, buf.c_str(), buf.size());
// Set lastCurlyLoc
lastCurlyLoc = body->getLocEnd();
// Now check for any return/continue/go statements within the @try.
WarnAboutReturnGotoContinueOrBreakStmts(S->getTryBody());
} else { /* no finally clause - make sure we synthesize an implicit one */
buf = "{ /* implicit finally clause */\n";
buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf.c_str(), buf.size());
}
// Now emit the final closing curly brace...
lastCurlyLoc = lastCurlyLoc.getFileLocWithOffset(1);
buf = " } /* @try scope end */\n";
InsertText(lastCurlyLoc, buf.c_str(), buf.size());
return 0;
}
Stmt *RewriteObjC::RewriteObjCCatchStmt(ObjCAtCatchStmt *S) {
return 0;
}
Stmt *RewriteObjC::RewriteObjCFinallyStmt(ObjCAtFinallyStmt *S) {
return 0;
}
// This can't be done with ReplaceStmt(S, ThrowExpr), since
// the throw expression is typically a message expression that's already
// been rewritten! (which implies the SourceLocation's are invalid).
Stmt *RewriteObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @throw location");
std::string buf;
/* void objc_exception_throw(id) __attribute__((noreturn)); */
if (S->getThrowExpr())
buf = "objc_exception_throw(";
else // add an implicit argument
buf = "objc_exception_throw(_caught";
// handle "@ throw" correctly.
const char *wBuf = strchr(startBuf, 'w');
assert((*wBuf == 'w') && "@throw: can't find 'w'");
ReplaceText(startLoc, wBuf-startBuf+1, buf.c_str(), buf.size());
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "@throw: can't find ';'");
SourceLocation semiLoc = startLoc.getFileLocWithOffset(semiBuf-startBuf);
buf = ");";
ReplaceText(semiLoc, 1, buf.c_str(), buf.size());
return 0;
}
Stmt *RewriteObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
// Create a new string expression.
QualType StrType = Context->getPointerType(Context->CharTy);
std::string StrEncoding;
Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
Expr *Replacement = StringLiteral::Create(*Context,StrEncoding.c_str(),
StrEncoding.length(), false,StrType,
SourceLocation());
ReplaceStmt(Exp, Replacement);
// Replace this subexpr in the parent.
// delete Exp; leak for now, see RewritePropertySetter() usage for more info.
return Replacement;
}
Stmt *RewriteObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
if (!SelGetUidFunctionDecl)
SynthSelGetUidFunctionDecl();
assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
// Create a call to sel_registerName("selName").
llvm::SmallVector<Expr*, 8> SelExprs;
QualType argType = Context->getPointerType(Context->CharTy);
SelExprs.push_back(StringLiteral::Create(*Context,
Exp->getSelector().getAsString().c_str(),
Exp->getSelector().getAsString().size(),
false, argType, SourceLocation()));
CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
&SelExprs[0], SelExprs.size());
ReplaceStmt(Exp, SelExp);
// delete Exp; leak for now, see RewritePropertySetter() usage for more info.
return SelExp;
}
CallExpr *RewriteObjC::SynthesizeCallToFunctionDecl(
FunctionDecl *FD, Expr **args, unsigned nargs) {
// Get the type, we will need to reference it in a couple spots.
QualType msgSendType = FD->getType();
// Create a reference to the objc_msgSend() declaration.
DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, msgSendType, SourceLocation());
// Now, we cast the reference to a pointer to the objc_msgSend type.
QualType pToFunc = Context->getPointerType(msgSendType);
ImplicitCastExpr *ICE = new (Context) ImplicitCastExpr(pToFunc, DRE,
/*isLvalue=*/false);
const FunctionType *FT = msgSendType->getAsFunctionType();
return new (Context) CallExpr(*Context, ICE, args, nargs, FT->getResultType(),
SourceLocation());
}
static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
const char *&startRef, const char *&endRef) {
while (startBuf < endBuf) {
if (*startBuf == '<')
startRef = startBuf; // mark the start.
if (*startBuf == '>') {
if (startRef && *startRef == '<') {
endRef = startBuf; // mark the end.
return true;
}
return false;
}
startBuf++;
}
return false;
}
static void scanToNextArgument(const char *&argRef) {
int angle = 0;
while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
if (*argRef == '<')
angle++;
else if (*argRef == '>')
angle--;
argRef++;
}
assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
}
bool RewriteObjC::needToScanForQualifiers(QualType T) {
if (T->isObjCQualifiedIdType())
return true;
if (const PointerType *pType = T->getAsPointerType()) {
Type *pointeeType = pType->getPointeeType().getTypePtr();
if (isa<ObjCQualifiedInterfaceType>(pointeeType))
return true; // we have "Class <Protocol> *".
}
return false;
}
void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
QualType Type = E->getType();
if (needToScanForQualifiers(Type)) {
SourceLocation Loc, EndLoc;
if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
Loc = ECE->getLParenLoc();
EndLoc = ECE->getRParenLoc();
} else {
Loc = E->getLocStart();
EndLoc = E->getLocEnd();
}
// This will defend against trying to rewrite synthesized expressions.
if (Loc.isInvalid() || EndLoc.isInvalid())
return;
const char *startBuf = SM->getCharacterData(Loc);
const char *endBuf = SM->getCharacterData(EndLoc);
const char *startRef = 0, *endRef = 0;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc = Loc.getFileLocWithOffset(startRef-startBuf);
SourceLocation GreaterLoc = Loc.getFileLocWithOffset(endRef-startBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*", 2);
InsertText(GreaterLoc, "*/", 2);
}
}
}
void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
SourceLocation Loc;
QualType Type;
const FunctionProtoType *proto = 0;
if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
Loc = VD->getLocation();
Type = VD->getType();
}
else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
Loc = FD->getLocation();
// Check for ObjC 'id' and class types that have been adorned with protocol
// information (id<p>, C<p>*). The protocol references need to be rewritten!
const FunctionType *funcType = FD->getType()->getAsFunctionType();
assert(funcType && "missing function type");
proto = dyn_cast<FunctionProtoType>(funcType);
if (!proto)
return;
Type = proto->getResultType();
}
else
return;
if (needToScanForQualifiers(Type)) {
// Since types are unique, we need to scan the buffer.
const char *endBuf = SM->getCharacterData(Loc);
const char *startBuf = endBuf;
while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
startBuf--; // scan backward (from the decl location) for return type.
const char *startRef = 0, *endRef = 0;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc = Loc.getFileLocWithOffset(startRef-endBuf);
SourceLocation GreaterLoc = Loc.getFileLocWithOffset(endRef-endBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*", 2);
InsertText(GreaterLoc, "*/", 2);
}
}
if (!proto)
return; // most likely, was a variable
// Now check arguments.
const char *startBuf = SM->getCharacterData(Loc);
const char *startFuncBuf = startBuf;
for (unsigned i = 0; i < proto->getNumArgs(); i++) {
if (needToScanForQualifiers(proto->getArgType(i))) {
// Since types are unique, we need to scan the buffer.
const char *endBuf = startBuf;
// scan forward (from the decl location) for argument types.
scanToNextArgument(endBuf);
const char *startRef = 0, *endRef = 0;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc =
Loc.getFileLocWithOffset(startRef-startFuncBuf);
SourceLocation GreaterLoc =
Loc.getFileLocWithOffset(endRef-startFuncBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*", 2);
InsertText(GreaterLoc, "*/", 2);
}
startBuf = ++endBuf;
}
else {
// If the function name is derived from a macro expansion, then the
// argument buffer will not follow the name. Need to speak with Chris.
while (*startBuf && *startBuf != ')' && *startBuf != ',')
startBuf++; // scan forward (from the decl location) for argument types.
startBuf++;
}
}
}
// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
void RewriteObjC::SynthSelGetUidFunctionDecl() {
IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
llvm::SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(
Context->CharTy.getQualifiedType(QualType::Const)));
QualType getFuncType = Context->getFunctionType(Context->getObjCSelType(),
&ArgTys[0], ArgTys.size(),
false /*isVariadic*/, 0);
SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SelGetUidIdent, getFuncType,
FunctionDecl::Extern, false);
}
// SynthGetProtocolFunctionDecl - Protocol objc_getProtocol(const char *proto);
void RewriteObjC::SynthGetProtocolFunctionDecl() {
IdentifierInfo *SelGetProtoIdent = &Context->Idents.get("objc_getProtocol");
llvm::SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(
Context->CharTy.getQualifiedType(QualType::Const)));
QualType getFuncType = Context->getFunctionType(Context->getObjCProtoType(),
&ArgTys[0], ArgTys.size(),
false /*isVariadic*/, 0);
GetProtocolFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SelGetProtoIdent, getFuncType,
FunctionDecl::Extern, false);
}
void RewriteObjC::RewriteFunctionDecl(FunctionDecl *FD) {
// declared in <objc/objc.h>
if (FD->getIdentifier() &&
strcmp(FD->getNameAsCString(), "sel_registerName") == 0) {
SelGetUidFunctionDecl = FD;
return;
}
RewriteObjCQualifiedInterfaceTypes(FD);
}
// SynthSuperContructorFunctionDecl - id objc_super(id obj, id super);
void RewriteObjC::SynthSuperContructorFunctionDecl() {
if (SuperContructorFunctionDecl)
return;
IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
llvm::SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
false, 0);
SuperContructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
llvm::SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
true /*isVariadic*/, 0);
MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(struct objc_super *, SEL op, ...);
void RewriteObjC::SynthMsgSendSuperFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
llvm::SmallVector<QualType, 16> ArgTys;
RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"));
QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
true /*isVariadic*/, 0);
MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendStretFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
llvm::SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
true /*isVariadic*/, 0);
MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthMsgSendSuperStretFunctionDecl -
// id objc_msgSendSuper_stret(struct objc_super *, SEL op, ...);
void RewriteObjC::SynthMsgSendSuperStretFunctionDecl() {
IdentifierInfo *msgSendIdent =
&Context->Idents.get("objc_msgSendSuper_stret");
llvm::SmallVector<QualType, 16> ArgTys;
RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"));
QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
true /*isVariadic*/, 0);
MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendFpretFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
llvm::SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = Context->getFunctionType(Context->DoubleTy,
&ArgTys[0], ArgTys.size(),
true /*isVariadic*/, 0);
MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false);
}
// SynthGetClassFunctionDecl - id objc_getClass(const char *name);
void RewriteObjC::SynthGetClassFunctionDecl() {
IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
llvm::SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(
Context->CharTy.getQualifiedType(QualType::Const)));
QualType getClassType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
false /*isVariadic*/, 0);
GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
getClassIdent, getClassType,
FunctionDecl::Extern, false);
}
// SynthGetMetaClassFunctionDecl - id objc_getClass(const char *name);
void RewriteObjC::SynthGetMetaClassFunctionDecl() {
IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
llvm::SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(
Context->CharTy.getQualifiedType(QualType::Const)));
QualType getClassType = Context->getFunctionType(Context->getObjCIdType(),
&ArgTys[0], ArgTys.size(),
false /*isVariadic*/, 0);
GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
getClassIdent, getClassType,
FunctionDecl::Extern, false);
}
Stmt *RewriteObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
QualType strType = getConstantStringStructType();
std::string S = "__NSConstantStringImpl_";
std::string tmpName = InFileName;
unsigned i;
for (i=0; i < tmpName.length(); i++) {
char c = tmpName.at(i);
// replace any non alphanumeric characters with '_'.
if (!isalpha(c) && (c < '0' || c > '9'))
tmpName[i] = '_';
}
S += tmpName;
S += "_";
S += utostr(NumObjCStringLiterals++);
Preamble += "static __NSConstantStringImpl " + S;
Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
Preamble += "0x000007c8,"; // utf8_str
// The pretty printer for StringLiteral handles escape characters properly.
std::string prettyBufS;
llvm::raw_string_ostream prettyBuf(prettyBufS);
Exp->getString()->printPretty(prettyBuf);
Preamble += prettyBuf.str();
Preamble += ",";
// The minus 2 removes the begin/end double quotes.
Preamble += utostr(prettyBuf.str().size()-2) + "};\n";
VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
&Context->Idents.get(S.c_str()), strType,
VarDecl::Static);
DeclRefExpr *DRE = new (Context) DeclRefExpr(NewVD, strType, SourceLocation());
Expr *Unop = new (Context) UnaryOperator(DRE, UnaryOperator::AddrOf,
Context->getPointerType(DRE->getType()),
SourceLocation());
// cast to NSConstantString *
CastExpr *cast = new (Context) CStyleCastExpr(Exp->getType(), Unop,
Exp->getType(), SourceLocation(), SourceLocation());
ReplaceStmt(Exp, cast);
// delete Exp; leak for now, see RewritePropertySetter() usage for more info.
return cast;
}
ObjCInterfaceDecl *RewriteObjC::isSuperReceiver(Expr *recExpr) {
// check if we are sending a message to 'super'
if (!CurMethodDef || !CurMethodDef->isInstanceMethod()) return 0;
if (ObjCSuperExpr *Super = dyn_cast<ObjCSuperExpr>(recExpr)) {
const PointerType *PT = Super->getType()->getAsPointerType();
assert(PT);
ObjCInterfaceType *IT = cast<ObjCInterfaceType>(PT->getPointeeType());
return IT->getDecl();
}
return 0;
}
// struct objc_super { struct objc_object *receiver; struct objc_class *super; };
QualType RewriteObjC::getSuperStructType() {
if (!SuperStructDecl) {
SuperStructDecl = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"));
QualType FieldTypes[2];
// struct objc_object *receiver;
FieldTypes[0] = Context->getObjCIdType();
// struct objc_class *super;
FieldTypes[1] = Context->getObjCClassType();
// Create fields
for (unsigned i = 0; i < 2; ++i) {
SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
SourceLocation(), 0,
FieldTypes[i], /*BitWidth=*/0,
/*Mutable=*/false));
}
SuperStructDecl->completeDefinition(*Context);
}
return Context->getTagDeclType(SuperStructDecl);
}
QualType RewriteObjC::getConstantStringStructType() {
if (!ConstantStringDecl) {
ConstantStringDecl = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(),
&Context->Idents.get("__NSConstantStringImpl"));
QualType FieldTypes[4];
// struct objc_object *receiver;
FieldTypes[0] = Context->getObjCIdType();
// int flags;
FieldTypes[1] = Context->IntTy;
// char *str;
FieldTypes[2] = Context->getPointerType(Context->CharTy);
// long length;
FieldTypes[3] = Context->LongTy;
// Create fields
for (unsigned i = 0; i < 4; ++i) {
ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
ConstantStringDecl,
SourceLocation(), 0,
FieldTypes[i],
/*BitWidth=*/0,
/*Mutable=*/true));
}
ConstantStringDecl->completeDefinition(*Context);
}
return Context->getTagDeclType(ConstantStringDecl);
}
Stmt *RewriteObjC::SynthMessageExpr(ObjCMessageExpr *Exp) {
if (!SelGetUidFunctionDecl)
SynthSelGetUidFunctionDecl();
if (!MsgSendFunctionDecl)
SynthMsgSendFunctionDecl();
if (!MsgSendSuperFunctionDecl)
SynthMsgSendSuperFunctionDecl();
if (!MsgSendStretFunctionDecl)
SynthMsgSendStretFunctionDecl();
if (!MsgSendSuperStretFunctionDecl)
SynthMsgSendSuperStretFunctionDecl();
if (!MsgSendFpretFunctionDecl)
SynthMsgSendFpretFunctionDecl();
if (!GetClassFunctionDecl)
SynthGetClassFunctionDecl();
if (!GetMetaClassFunctionDecl)
SynthGetMetaClassFunctionDecl();
// default to objc_msgSend().
FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
// May need to use objc_msgSend_stret() as well.
FunctionDecl *MsgSendStretFlavor = 0;
if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
QualType resultType = OMD->getResultType();
if (resultType->isStructureType() || resultType->isUnionType())
MsgSendStretFlavor = MsgSendStretFunctionDecl;
else if (resultType->isRealFloatingType())
MsgSendFlavor = MsgSendFpretFunctionDecl;
}
// Synthesize a call to objc_msgSend().
llvm::SmallVector<Expr*, 8> MsgExprs;
IdentifierInfo *clsName = Exp->getClassName();
// Derive/push the receiver/selector, 2 implicit arguments to objc_msgSend().
if (clsName) { // class message.
// FIXME: We need to fix Sema (and the AST for ObjCMessageExpr) to handle
// the 'super' idiom within a class method.
if (!strcmp(clsName->getName(), "super")) {
MsgSendFlavor = MsgSendSuperFunctionDecl;
if (MsgSendStretFlavor)
MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
ObjCInterfaceDecl *SuperDecl =
CurMethodDef->getClassInterface()->getSuperClass();
llvm::SmallVector<Expr*, 4> InitExprs;
// set the receiver to self, the first argument to all methods.
InitExprs.push_back(new (Context) DeclRefExpr(
CurMethodDef->getSelfDecl(),
Context->getObjCIdType(),
SourceLocation()));
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(StringLiteral::Create(*Context,
SuperDecl->getIdentifier()->getName(),
SuperDecl->getIdentifier()->getLength(),
false, argType, SourceLocation()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size());
// To turn off a warning, type-cast to 'id'
InitExprs.push_back( // set 'super class', using objc_getClass().
new (Context) CStyleCastExpr(Context->getObjCIdType(),
Cls, Context->getObjCIdType(),
SourceLocation(), SourceLocation()));
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.Microsoft) {
SynthSuperContructorFunctionDecl();
// Simulate a contructor call...
DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperContructorFunctionDecl,
superType, SourceLocation());
SuperRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0],
InitExprs.size(),
superType, SourceLocation());
// The code for super is a little tricky to prevent collision with
// the structure definition in the header. The rewriter has it's own
// internal definition (__rw_objc_super) that is uses. This is why
// we need the cast below. For example:
// (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
//
SuperRep = new (Context) UnaryOperator(SuperRep, UnaryOperator::AddrOf,
Context->getPointerType(SuperRep->getType()),
SourceLocation());
SuperRep = new (Context) CStyleCastExpr(Context->getPointerType(superType),
SuperRep, Context->getPointerType(superType),
SourceLocation(), SourceLocation());
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE = new (Context) InitListExpr(SourceLocation(),
&InitExprs[0], InitExprs.size(),
SourceLocation());
SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superType, ILE,
false);
// struct objc_super *
SuperRep = new (Context) UnaryOperator(SuperRep, UnaryOperator::AddrOf,
Context->getPointerType(SuperRep->getType()),
SourceLocation());
}
MsgExprs.push_back(SuperRep);
} else {
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(StringLiteral::Create(*Context,
clsName->getName(),
clsName->getLength(),
false, argType,
SourceLocation()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size());
MsgExprs.push_back(Cls);
}
} else { // instance message.
Expr *recExpr = Exp->getReceiver();
if (ObjCInterfaceDecl *SuperDecl = isSuperReceiver(recExpr)) {
MsgSendFlavor = MsgSendSuperFunctionDecl;
if (MsgSendStretFlavor)
MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
llvm::SmallVector<Expr*, 4> InitExprs;
InitExprs.push_back(
new (Context) CStyleCastExpr(Context->getObjCIdType(),
new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
Context->getObjCIdType(),
SourceLocation()),
Context->getObjCIdType(),
SourceLocation(), SourceLocation())); // set the 'receiver'.
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(StringLiteral::Create(*Context,
SuperDecl->getIdentifier()->getName(),
SuperDecl->getIdentifier()->getLength(),
false, argType, SourceLocation()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size());
// To turn off a warning, type-cast to 'id'
InitExprs.push_back(
// set 'super class', using objc_getClass().
new (Context) CStyleCastExpr(Context->getObjCIdType(),
Cls, Context->getObjCIdType(), SourceLocation(), SourceLocation()));
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.Microsoft) {
SynthSuperContructorFunctionDecl();
// Simulate a contructor call...
DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperContructorFunctionDecl,
superType, SourceLocation());
SuperRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0],
InitExprs.size(),
superType, SourceLocation());
// The code for super is a little tricky to prevent collision with
// the structure definition in the header. The rewriter has it's own
// internal definition (__rw_objc_super) that is uses. This is why
// we need the cast below. For example:
// (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
//
SuperRep = new (Context) UnaryOperator(SuperRep, UnaryOperator::AddrOf,
Context->getPointerType(SuperRep->getType()),
SourceLocation());
SuperRep = new (Context) CStyleCastExpr(Context->getPointerType(superType),
SuperRep, Context->getPointerType(superType),
SourceLocation(), SourceLocation());
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE = new (Context) InitListExpr(SourceLocation(),
&InitExprs[0], InitExprs.size(),
SourceLocation());
SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superType, ILE, false);
}
MsgExprs.push_back(SuperRep);
} else {
// Remove all type-casts because it may contain objc-style types; e.g.
// Foo<Proto> *.
while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
recExpr = CE->getSubExpr();
recExpr = new (Context) CStyleCastExpr(Context->getObjCIdType(), recExpr,
Context->getObjCIdType(),
SourceLocation(), SourceLocation());
MsgExprs.push_back(recExpr);
}
}
// Create a call to sel_registerName("selName"), it will be the 2nd argument.
llvm::SmallVector<Expr*, 8> SelExprs;
QualType argType = Context->getPointerType(Context->CharTy);
SelExprs.push_back(StringLiteral::Create(*Context,
Exp->getSelector().getAsString().c_str(),
Exp->getSelector().getAsString().size(),
false, argType, SourceLocation()));
CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
&SelExprs[0], SelExprs.size());
MsgExprs.push_back(SelExp);
// Now push any user supplied arguments.
for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
Expr *userExpr = Exp->getArg(i);
// Make all implicit casts explicit...ICE comes in handy:-)
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
// Reuse the ICE type, it is exactly what the doctor ordered.
QualType type = ICE->getType()->isObjCQualifiedIdType()
? Context->getObjCIdType()
: ICE->getType();
userExpr = new (Context) CStyleCastExpr(type, userExpr, type, SourceLocation(), SourceLocation());
}
// Make id<P...> cast into an 'id' cast.
else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
if (CE->getType()->isObjCQualifiedIdType()) {
while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
userExpr = CE->getSubExpr();
userExpr = new (Context) CStyleCastExpr(Context->getObjCIdType(),
userExpr, Context->getObjCIdType(),
SourceLocation(), SourceLocation());
}
}
MsgExprs.push_back(userExpr);
// We've transferred the ownership to MsgExprs. Null out the argument in
// the original expression, since we will delete it below.
Exp->setArg(i, 0);
}
// Generate the funky cast.
CastExpr *cast;
llvm::SmallVector<QualType, 8> ArgTypes;
QualType returnType;
// Push 'id' and 'SEL', the 2 implicit arguments.
if (MsgSendFlavor == MsgSendSuperFunctionDecl)
ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
else
ArgTypes.push_back(Context->getObjCIdType());
ArgTypes.push_back(Context->getObjCSelType());
if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
// Push any user argument types.
for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(),
E = OMD->param_end(); PI != E; ++PI) {
QualType t = (*PI)->getType()->isObjCQualifiedIdType()
? Context->getObjCIdType()
: (*PI)->getType();
// Make sure we convert "t (^)(...)" to "t (*)(...)".
if (isTopLevelBlockPointerType(t)) {
const BlockPointerType *BPT = t->getAsBlockPointerType();
t = Context->getPointerType(BPT->getPointeeType());
}
ArgTypes.push_back(t);
}
returnType = OMD->getResultType()->isObjCQualifiedIdType()
? Context->getObjCIdType() : OMD->getResultType();
} else {
returnType = Context->getObjCIdType();
}
// Get the type, we will need to reference it in a couple spots.
QualType msgSendType = MsgSendFlavor->getType();
// Create a reference to the objc_msgSend() declaration.
DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, msgSendType,
SourceLocation());
// Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
// If we don't do this cast, we get the following bizarre warning/note:
// xx.m:13: warning: function called through a non-compatible type
// xx.m:13: note: if this code is reached, the program will abort
cast = new (Context) CStyleCastExpr(Context->getPointerType(Context->VoidTy), DRE,
Context->getPointerType(Context->VoidTy),
SourceLocation(), SourceLocation());
// Now do the "normal" pointer to function cast.
QualType castType = Context->getFunctionType(returnType,
&ArgTypes[0], ArgTypes.size(),
// If we don't have a method decl, force a variadic cast.
Exp->getMethodDecl() ? Exp->getMethodDecl()->isVariadic() : true, 0);
castType = Context->getPointerType(castType);
cast = new (Context) CStyleCastExpr(castType, cast, castType, SourceLocation(), SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), cast);
const FunctionType *FT = msgSendType->getAsFunctionType();
CallExpr *CE = new (Context) CallExpr(*Context, PE, &MsgExprs[0],
MsgExprs.size(),
FT->getResultType(), SourceLocation());
Stmt *ReplacingStmt = CE;
if (MsgSendStretFlavor) {
// We have the method which returns a struct/union. Must also generate
// call to objc_msgSend_stret and hang both varieties on a conditional
// expression which dictate which one to envoke depending on size of
// method's return type.
// Create a reference to the objc_msgSend_stret() declaration.
DeclRefExpr *STDRE = new (Context) DeclRefExpr(MsgSendStretFlavor, msgSendType,
SourceLocation());
// Need to cast objc_msgSend_stret to "void *" (see above comment).
cast = new (Context) CStyleCastExpr(Context->getPointerType(Context->VoidTy), STDRE,
Context->getPointerType(Context->VoidTy),
SourceLocation(), SourceLocation());
// Now do the "normal" pointer to function cast.
castType = Context->getFunctionType(returnType,
&ArgTypes[0], ArgTypes.size(),
Exp->getMethodDecl() ? Exp->getMethodDecl()->isVariadic() : false, 0);
castType = Context->getPointerType(castType);
cast = new (Context) CStyleCastExpr(castType, cast, castType, SourceLocation(), SourceLocation());
// Don't forget the parens to enforce the proper binding.
PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), cast);
FT = msgSendType->getAsFunctionType();
CallExpr *STCE = new (Context) CallExpr(*Context, PE, &MsgExprs[0],
MsgExprs.size(),
FT->getResultType(), SourceLocation());
// Build sizeof(returnType)
SizeOfAlignOfExpr *sizeofExpr = new (Context) SizeOfAlignOfExpr(true, true,
returnType.getAsOpaquePtr(),
Context->getSizeType(),
SourceLocation(), SourceLocation());
// (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
// FIXME: Value of 8 is base on ppc32/x86 ABI for the most common cases.
// For X86 it is more complicated and some kind of target specific routine
// is needed to decide what to do.
unsigned IntSize =
static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
IntegerLiteral *limit = new (Context) IntegerLiteral(llvm::APInt(IntSize, 8),
Context->IntTy,
SourceLocation());
BinaryOperator *lessThanExpr = new (Context) BinaryOperator(sizeofExpr, limit,
BinaryOperator::LE,
Context->IntTy,
SourceLocation());
// (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
ConditionalOperator *CondExpr =
new (Context) ConditionalOperator(lessThanExpr, CE, STCE, returnType);
ReplacingStmt = new (Context) ParenExpr(SourceLocation(), SourceLocation(), CondExpr);
}
return ReplacingStmt;
}
Stmt *RewriteObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
Stmt *ReplacingStmt = SynthMessageExpr(Exp);
//ReplacingStmt->dump();
// Now do the actual rewrite.
ReplaceStmt(Exp, ReplacingStmt);
// delete Exp; leak for now, see RewritePropertySetter() usage for more info.
return ReplacingStmt;
}
/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
/// call to objc_getProtocol("proto-name").
Stmt *RewriteObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
if (!GetProtocolFunctionDecl)
SynthGetProtocolFunctionDecl();
// Create a call to objc_getProtocol("ProtocolName").
llvm::SmallVector<Expr*, 8> ProtoExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ProtoExprs.push_back(StringLiteral::Create(*Context,
Exp->getProtocol()->getNameAsCString(),
strlen(Exp->getProtocol()->getNameAsCString()),
false, argType, SourceLocation()));
CallExpr *ProtoExp = SynthesizeCallToFunctionDecl(GetProtocolFunctionDecl,
&ProtoExprs[0],
ProtoExprs.size());
ReplaceStmt(Exp, ProtoExp);
// delete Exp; leak for now, see RewritePropertySetter() usage for more info.
return ProtoExp;
}
bool RewriteObjC::BufferContainsPPDirectives(const char *startBuf,
const char *endBuf) {
while (startBuf < endBuf) {
if (*startBuf == '#') {
// Skip whitespace.
for (++startBuf; startBuf[0] == ' ' || startBuf[0] == '\t'; ++startBuf)
;
if (!strncmp(startBuf, "if", strlen("if")) ||
!strncmp(startBuf, "ifdef", strlen("ifdef")) ||
!strncmp(startBuf, "ifndef", strlen("ifndef")) ||
!strncmp(startBuf, "define", strlen("define")) ||
!strncmp(startBuf, "undef", strlen("undef")) ||
!strncmp(startBuf, "else", strlen("else")) ||
!strncmp(startBuf, "elif", strlen("elif")) ||
!strncmp(startBuf, "endif", strlen("endif")) ||
!strncmp(startBuf, "pragma", strlen("pragma")) ||
!strncmp(startBuf, "include", strlen("include")) ||
!strncmp(startBuf, "import", strlen("import")) ||
!strncmp(startBuf, "include_next", strlen("include_next")))
return true;
}
startBuf++;
}
return false;
}
/// SynthesizeObjCInternalStruct - Rewrite one internal struct corresponding to
/// an objective-c class with ivars.
void RewriteObjC::SynthesizeObjCInternalStruct(ObjCInterfaceDecl *CDecl,
std::string &Result) {
assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
assert(CDecl->getNameAsCString() &&
"Name missing in SynthesizeObjCInternalStruct");
// Do not synthesize more than once.
if (ObjCSynthesizedStructs.count(CDecl))
return;
ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
int NumIvars = CDecl->ivar_size();
SourceLocation LocStart = CDecl->getLocStart();
SourceLocation LocEnd = CDecl->getLocEnd();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
// If no ivars and no root or if its root, directly or indirectly,
// have no ivars (thus not synthesized) then no need to synthesize this class.
if ((CDecl->isForwardDecl() || NumIvars == 0) &&
(!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
endBuf += Lexer::MeasureTokenLength(LocEnd, *SM);
ReplaceText(LocStart, endBuf-startBuf, Result.c_str(), Result.size());
return;
}
// FIXME: This has potential of causing problem. If
// SynthesizeObjCInternalStruct is ever called recursively.
Result += "\nstruct ";
Result += CDecl->getNameAsString();
if (LangOpts.Microsoft)
Result += "_IMPL";
if (NumIvars > 0) {
const char *cursor = strchr(startBuf, '{');
assert((cursor && endBuf)
&& "SynthesizeObjCInternalStruct - malformed @interface");
// If the buffer contains preprocessor directives, we do more fine-grained
// rewrites. This is intended to fix code that looks like (which occurs in
// NSURL.h, for example):
//
// #ifdef XYZ
// @interface Foo : NSObject
// #else
// @interface FooBar : NSObject
// #endif
// {
// int i;
// }
// @end
//
// This clause is segregated to avoid breaking the common case.
if (BufferContainsPPDirectives(startBuf, cursor)) {
SourceLocation L = RCDecl ? CDecl->getSuperClassLoc() :
CDecl->getClassLoc();
const char *endHeader = SM->getCharacterData(L);
endHeader += Lexer::MeasureTokenLength(L, *SM);
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
// advance to the end of the referenced protocols.
while (endHeader < cursor && *endHeader != '>') endHeader++;
endHeader++;
}
// rewrite the original header
ReplaceText(LocStart, endHeader-startBuf, Result.c_str(), Result.size());
} else {
// rewrite the original header *without* disturbing the '{'
ReplaceText(LocStart, cursor-startBuf-1, Result.c_str(), Result.size());
}
if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
Result = "\n struct ";
Result += RCDecl->getNameAsString();
Result += "_IMPL ";
Result += RCDecl->getNameAsString();
Result += "_IVARS;\n";
// insert the super class structure definition.
SourceLocation OnePastCurly =
LocStart.getFileLocWithOffset(cursor-startBuf+1);
InsertText(OnePastCurly, Result.c_str(), Result.size());
}
cursor++; // past '{'
// Now comment out any visibility specifiers.
while (cursor < endBuf) {
if (*cursor == '@') {
SourceLocation atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
// Skip whitespace.
for (++cursor; cursor[0] == ' ' || cursor[0] == '\t'; ++cursor)
/*scan*/;
// FIXME: presence of @public, etc. inside comment results in
// this transformation as well, which is still correct c-code.
if (!strncmp(cursor, "public", strlen("public")) ||
!strncmp(cursor, "private", strlen("private")) ||
!strncmp(cursor, "package", strlen("package")) ||
!strncmp(cursor, "protected", strlen("protected")))
InsertText(atLoc, "// ", 3);
}
// FIXME: If there are cases where '<' is used in ivar declaration part
// of user code, then scan the ivar list and use needToScanForQualifiers
// for type checking.
else if (*cursor == '<') {
SourceLocation atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
InsertText(atLoc, "/* ", 3);
cursor = strchr(cursor, '>');
cursor++;
atLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
InsertText(atLoc, " */", 3);
} else if (*cursor == '^') { // rewrite block specifier.
SourceLocation caretLoc = LocStart.getFileLocWithOffset(cursor-startBuf);
ReplaceText(caretLoc, 1, "*", 1);
}
cursor++;
}
// Don't forget to add a ';'!!
InsertText(LocEnd.getFileLocWithOffset(1), ";", 1);
} else { // we don't have any instance variables - insert super struct.
endBuf += Lexer::MeasureTokenLength(LocEnd, *SM);
Result += " {\n struct ";
Result += RCDecl->getNameAsString();
Result += "_IMPL ";
Result += RCDecl->getNameAsString();
Result += "_IVARS;\n};\n";
ReplaceText(LocStart, endBuf-startBuf, Result.c_str(), Result.size());
}
// Mark this struct as having been generated.
if (!ObjCSynthesizedStructs.insert(CDecl))
assert(false && "struct already synthesize- SynthesizeObjCInternalStruct");
}
// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
/// class methods.
void RewriteObjC::RewriteObjCMethodsMetaData(instmeth_iterator MethodBegin,
instmeth_iterator MethodEnd,
bool IsInstanceMethod,
const char *prefix,
const char *ClassName,
std::string &Result) {
if (MethodBegin == MethodEnd) return;
static bool objc_impl_method = false;
if (!objc_impl_method) {
/* struct _objc_method {
SEL _cmd;
char *method_types;
void *_imp;
}
*/
Result += "\nstruct _objc_method {\n";
Result += "\tSEL _cmd;\n";
Result += "\tchar *method_types;\n";
Result += "\tvoid *_imp;\n";
Result += "};\n";
objc_impl_method = true;
}
// Build _objc_method_list for class's methods if needed
/* struct {
struct _objc_method_list *next_method;
int method_count;
struct _objc_method method_list[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tstruct _objc_method_list *next_method;\n";
Result += "\tint method_count;\n";
Result += "\tstruct _objc_method method_list[";
Result += utostr(MethodEnd-MethodBegin);
Result += "];\n} _OBJC_";
Result += prefix;
Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
Result += "_METHODS_";
Result += ClassName;
Result += " __attribute__ ((used, section (\"__OBJC, __";
Result += IsInstanceMethod ? "inst" : "cls";
Result += "_meth\")))= ";
Result += "{\n\t0, " + utostr(MethodEnd-MethodBegin) + "\n";
Result += "\t,{{(SEL)\"";
Result += (*MethodBegin)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\", (void *)";
Result += MethodInternalNames[*MethodBegin];
Result += "}\n";
for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
Result += "\t ,{(SEL)\"";
Result += (*MethodBegin)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\", (void *)";
Result += MethodInternalNames[*MethodBegin];
Result += "}\n";
}
Result += "\t }\n};\n";
}
/// RewriteObjCProtocolsMetaData - Rewrite protocols meta-data.
void RewriteObjC::
RewriteObjCProtocolsMetaData(const ObjCList<ObjCProtocolDecl> &Protocols,
const char *prefix,
const char *ClassName,
std::string &Result) {
static bool objc_protocol_methods = false;
if (Protocols.empty()) return;
for (unsigned i = 0; i != Protocols.size(); i++) {
ObjCProtocolDecl *PDecl = Protocols[i];
// Output struct protocol_methods holder of method selector and type.
if (!objc_protocol_methods && !PDecl->isForwardDecl()) {
/* struct protocol_methods {
SEL _cmd;
char *method_types;
}
*/
Result += "\nstruct protocol_methods {\n";
Result += "\tSEL _cmd;\n";
Result += "\tchar *method_types;\n";
Result += "};\n";
objc_protocol_methods = true;
}
// Do not synthesize the protocol more than once.
if (ObjCSynthesizedProtocols.count(PDecl))
continue;
if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
unsigned NumMethods = std::distance(PDecl->instmeth_begin(),
PDecl->instmeth_end());
/* struct _objc_protocol_method_list {
int protocol_method_count;
struct protocol_methods protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tint protocol_method_count;\n";
Result += "\tstruct protocol_methods protocols[";
Result += utostr(NumMethods);
Result += "];\n} _OBJC_PROTOCOL_INSTANCE_METHODS_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __cat_inst_meth\")))= "
"{\n\t" + utostr(NumMethods) + "\n";
// Output instance methods declared in this protocol.
for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
E = PDecl->instmeth_end(); I != E; ++I) {
if (I == PDecl->instmeth_begin())
Result += "\t ,{{(SEL)\"";
else
Result += "\t ,{(SEL)\"";
Result += (*I)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\"}\n";
}
Result += "\t }\n};\n";
}
// Output class methods declared in this protocol.
unsigned NumMethods = std::distance(PDecl->classmeth_begin(),
PDecl->classmeth_end());
if (NumMethods > 0) {
/* struct _objc_protocol_method_list {
int protocol_method_count;
struct protocol_methods protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tint protocol_method_count;\n";
Result += "\tstruct protocol_methods protocols[";
Result += utostr(NumMethods);
Result += "];\n} _OBJC_PROTOCOL_CLASS_METHODS_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
"{\n\t";
Result += utostr(NumMethods);
Result += "\n";
// Output instance methods declared in this protocol.
for (ObjCProtocolDecl::classmeth_iterator I = PDecl->classmeth_begin(),
E = PDecl->classmeth_end(); I != E; ++I) {
if (I == PDecl->classmeth_begin())
Result += "\t ,{{(SEL)\"";
else
Result += "\t ,{(SEL)\"";
Result += (*I)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\"}\n";
}
Result += "\t }\n};\n";
}
// Output:
/* struct _objc_protocol {
// Objective-C 1.0 extensions
struct _objc_protocol_extension *isa;
char *protocol_name;
struct _objc_protocol **protocol_list;
struct _objc_protocol_method_list *instance_methods;
struct _objc_protocol_method_list *class_methods;
};
*/
static bool objc_protocol = false;
if (!objc_protocol) {
Result += "\nstruct _objc_protocol {\n";
Result += "\tstruct _objc_protocol_extension *isa;\n";
Result += "\tchar *protocol_name;\n";
Result += "\tstruct _objc_protocol **protocol_list;\n";
Result += "\tstruct _objc_protocol_method_list *instance_methods;\n";
Result += "\tstruct _objc_protocol_method_list *class_methods;\n";
Result += "};\n";
objc_protocol = true;
}
Result += "\nstatic struct _objc_protocol _OBJC_PROTOCOL_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __protocol\")))= "
"{\n\t0, \"";
Result += PDecl->getNameAsString();
Result += "\", 0, ";
if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
Result += PDecl->getNameAsString();
Result += ", ";
}
else
Result += "0, ";
if (PDecl->classmeth_begin() != PDecl->classmeth_end()) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_CLASS_METHODS_";
Result += PDecl->getNameAsString();
Result += "\n";
}
else
Result += "0\n";
Result += "};\n";
// Mark this protocol as having been generated.
if (!ObjCSynthesizedProtocols.insert(PDecl))
assert(false && "protocol already synthesized");
}
// Output the top lovel protocol meta-data for the class.
/* struct _objc_protocol_list {
struct _objc_protocol_list *next;
int protocol_count;
struct _objc_protocol *class_protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tstruct _objc_protocol_list *next;\n";
Result += "\tint protocol_count;\n";
Result += "\tstruct _objc_protocol *class_protocols[";
Result += utostr(Protocols.size());
Result += "];\n} _OBJC_";
Result += prefix;
Result += "_PROTOCOLS_";
Result += ClassName;
Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
"{\n\t0, ";
Result += utostr(Protocols.size());
Result += "\n";
Result += "\t,{&_OBJC_PROTOCOL_";
Result += Protocols[0]->getNameAsString();
Result += " \n";
for (unsigned i = 1; i != Protocols.size(); i++) {
Result += "\t ,&_OBJC_PROTOCOL_";
Result += Protocols[i]->getNameAsString();
Result += "\n";
}
Result += "\t }\n};\n";
}
/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
/// implementation.
void RewriteObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
std::string &Result) {
ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
// Find category declaration for this implementation.
ObjCCategoryDecl *CDecl;
for (CDecl = ClassDecl->getCategoryList(); CDecl;
CDecl = CDecl->getNextClassCategory())
if (CDecl->getIdentifier() == IDecl->getIdentifier())
break;
std::string FullCategoryName = ClassDecl->getNameAsString();
FullCategoryName += '_';
FullCategoryName += IDecl->getNameAsString();
// Build _objc_method_list for class's instance methods if needed
RewriteObjCMethodsMetaData(IDecl->instmeth_begin(), IDecl->instmeth_end(),
true, "CATEGORY_", FullCategoryName.c_str(),
Result);
// Build _objc_method_list for class's class methods if needed
RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
false, "CATEGORY_", FullCategoryName.c_str(),
Result);
// Protocols referenced in class declaration?
// Null CDecl is case of a category implementation with no category interface
if (CDecl)
RewriteObjCProtocolsMetaData(CDecl->getReferencedProtocols(), "CATEGORY",
FullCategoryName.c_str(), Result);
/* struct _objc_category {
char *category_name;
char *class_name;
struct _objc_method_list *instance_methods;
struct _objc_method_list *class_methods;
struct _objc_protocol_list *protocols;
// Objective-C 1.0 extensions
uint32_t size; // sizeof (struct _objc_category)
struct _objc_property_list *instance_properties; // category's own
// @property decl.
};
*/
static bool objc_category = false;
if (!objc_category) {
Result += "\nstruct _objc_category {\n";
Result += "\tchar *category_name;\n";
Result += "\tchar *class_name;\n";
Result += "\tstruct _objc_method_list *instance_methods;\n";
Result += "\tstruct _objc_method_list *class_methods;\n";
Result += "\tstruct _objc_protocol_list *protocols;\n";
Result += "\tunsigned int size;\n";
Result += "\tstruct _objc_property_list *instance_properties;\n";
Result += "};\n";
objc_category = true;
}
Result += "\nstatic struct _objc_category _OBJC_CATEGORY_";
Result += FullCategoryName;
Result += " __attribute__ ((used, section (\"__OBJC, __category\")))= {\n\t\"";
Result += IDecl->getNameAsString();
Result += "\"\n\t, \"";
Result += ClassDecl->getNameAsString();
Result += "\"\n";
if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_INSTANCE_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_CLASS_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (CDecl && CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += "\t, (struct _objc_protocol_list *)&_OBJC_CATEGORY_PROTOCOLS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
Result += "\t, sizeof(struct _objc_category), 0\n};\n";
}
/// SynthesizeIvarOffsetComputation - This rutine synthesizes computation of
/// ivar offset.
void RewriteObjC::SynthesizeIvarOffsetComputation(ObjCImplementationDecl *IDecl,
ObjCIvarDecl *ivar,
std::string &Result) {
if (ivar->isBitField()) {
// FIXME: The hack below doesn't work for bitfields. For now, we simply
// place all bitfields at offset 0.
Result += "0";
} else {
Result += "__OFFSETOFIVAR__(struct ";
Result += IDecl->getNameAsString();
if (LangOpts.Microsoft)
Result += "_IMPL";
Result += ", ";
Result += ivar->getNameAsString();
Result += ")";
}
}
//===----------------------------------------------------------------------===//
// Meta Data Emission
//===----------------------------------------------------------------------===//
void RewriteObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
std::string &Result) {
ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
// Explictly declared @interface's are already synthesized.
if (CDecl->ImplicitInterfaceDecl()) {
// FIXME: Implementation of a class with no @interface (legacy) doese not
// produce correct synthesis as yet.
SynthesizeObjCInternalStruct(CDecl, Result);
}
// Build _objc_ivar_list metadata for classes ivars if needed
unsigned NumIvars = !IDecl->ivar_empty()
? IDecl->ivar_size()
: (CDecl ? CDecl->ivar_size() : 0);
if (NumIvars > 0) {
static bool objc_ivar = false;
if (!objc_ivar) {
/* struct _objc_ivar {
char *ivar_name;
char *ivar_type;
int ivar_offset;
};
*/
Result += "\nstruct _objc_ivar {\n";
Result += "\tchar *ivar_name;\n";
Result += "\tchar *ivar_type;\n";
Result += "\tint ivar_offset;\n";
Result += "};\n";
objc_ivar = true;
}
/* struct {
int ivar_count;
struct _objc_ivar ivar_list[nIvars];
};
*/
Result += "\nstatic struct {\n";
Result += "\tint ivar_count;\n";
Result += "\tstruct _objc_ivar ivar_list[";
Result += utostr(NumIvars);
Result += "];\n} _OBJC_INSTANCE_VARIABLES_";
Result += IDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __instance_vars\")))= "
"{\n\t";
Result += utostr(NumIvars);
Result += "\n";
ObjCInterfaceDecl::ivar_iterator IVI, IVE;
if (!IDecl->ivar_empty()) {
IVI = IDecl->ivar_begin();
IVE = IDecl->ivar_end();
} else {
IVI = CDecl->ivar_begin();
IVE = CDecl->ivar_end();
}
Result += "\t,{{\"";
Result += (*IVI)->getNameAsString();
Result += "\", \"";
std::string StrEncoding;
Context->getObjCEncodingForType((*IVI)->getType(), StrEncoding);
Result += StrEncoding;
Result += "\", ";
SynthesizeIvarOffsetComputation(IDecl, *IVI, Result);
Result += "}\n";
for (++IVI; IVI != IVE; ++IVI) {
Result += "\t ,{\"";
Result += (*IVI)->getNameAsString();
Result += "\", \"";
std::string StrEncoding;
Context->getObjCEncodingForType((*IVI)->getType(), StrEncoding);
Result += StrEncoding;
Result += "\", ";
SynthesizeIvarOffsetComputation(IDecl, (*IVI), Result);
Result += "}\n";
}
Result += "\t }\n};\n";
}
// Build _objc_method_list for class's instance methods if needed
RewriteObjCMethodsMetaData(IDecl->instmeth_begin(), IDecl->instmeth_end(),
true, "", IDecl->getNameAsCString(), Result);
// Build _objc_method_list for class's class methods if needed
RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
false, "", IDecl->getNameAsCString(), Result);
// Protocols referenced in class declaration?
RewriteObjCProtocolsMetaData(CDecl->getReferencedProtocols(),
"CLASS", CDecl->getNameAsCString(), Result);
// Declaration of class/meta-class metadata
/* struct _objc_class {
struct _objc_class *isa; // or const char *root_class_name when metadata
const char *super_class_name;
char *name;
long version;
long info;
long instance_size;
struct _objc_ivar_list *ivars;
struct _objc_method_list *methods;
struct objc_cache *cache;
struct objc_protocol_list *protocols;
const char *ivar_layout;
struct _objc_class_ext *ext;
};
*/
static bool objc_class = false;
if (!objc_class) {
Result += "\nstruct _objc_class {\n";
Result += "\tstruct _objc_class *isa;\n";
Result += "\tconst char *super_class_name;\n";
Result += "\tchar *name;\n";
Result += "\tlong version;\n";
Result += "\tlong info;\n";
Result += "\tlong instance_size;\n";
Result += "\tstruct _objc_ivar_list *ivars;\n";
Result += "\tstruct _objc_method_list *methods;\n";
Result += "\tstruct objc_cache *cache;\n";
Result += "\tstruct _objc_protocol_list *protocols;\n";
Result += "\tconst char *ivar_layout;\n";
Result += "\tstruct _objc_class_ext *ext;\n";
Result += "};\n";
objc_class = true;
}
// Meta-class metadata generation.
ObjCInterfaceDecl *RootClass = 0;
ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
while (SuperClass) {
RootClass = SuperClass;
SuperClass = SuperClass->getSuperClass();
}
SuperClass = CDecl->getSuperClass();
Result += "\nstatic struct _objc_class _OBJC_METACLASS_";
Result += CDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __meta_class\")))= "
"{\n\t(struct _objc_class *)\"";
Result += (RootClass ? RootClass->getNameAsString() : CDecl->getNameAsString());
Result += "\"";
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getNameAsString();
Result += "\", \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
// Set 'ivars' field for root class to 0. ObjC1 runtime does not use it.
// 'info' field is initialized to CLS_META(2) for metaclass
Result += ", 0,2, sizeof(struct _objc_class), 0";
if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
Result += "\n\t, (struct _objc_method_list *)&_OBJC_CLASS_METHODS_";
Result += IDecl->getNameAsString();
Result += "\n";
}
else
Result += ", 0\n";
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += "\t,0, (struct _objc_protocol_list *)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getNameAsString();
Result += ",0,0\n";
}
else
Result += "\t,0,0,0,0\n";
Result += "};\n";
// class metadata generation.
Result += "\nstatic struct _objc_class _OBJC_CLASS_";
Result += CDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __class\")))= "
"{\n\t&_OBJC_METACLASS_";
Result += CDecl->getNameAsString();
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getNameAsString();
Result += "\", \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
// 'info' field is initialized to CLS_CLASS(1) for class
Result += ", 0,1";
if (!ObjCSynthesizedStructs.count(CDecl))
Result += ",0";
else {
// class has size. Must synthesize its size.
Result += ",sizeof(struct ";
Result += CDecl->getNameAsString();
if (LangOpts.Microsoft)
Result += "_IMPL";
Result += ")";
}
if (NumIvars > 0) {
Result += ", (struct _objc_ivar_list *)&_OBJC_INSTANCE_VARIABLES_";
Result += CDecl->getNameAsString();
Result += "\n\t";
}
else
Result += ",0";
if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
Result += ", (struct _objc_method_list *)&_OBJC_INSTANCE_METHODS_";
Result += CDecl->getNameAsString();
Result += ", 0\n\t";
}
else
Result += ",0,0";
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += ", (struct _objc_protocol_list*)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getNameAsString();
Result += ", 0,0\n";
}
else
Result += ",0,0,0\n";
Result += "};\n";
}
/// RewriteImplementations - This routine rewrites all method implementations
/// and emits meta-data.
void RewriteObjC::RewriteImplementations() {
int ClsDefCount = ClassImplementation.size();
int CatDefCount = CategoryImplementation.size();
// Rewrite implemented methods
for (int i = 0; i < ClsDefCount; i++)
RewriteImplementationDecl(ClassImplementation[i]);
for (int i = 0; i < CatDefCount; i++)
RewriteImplementationDecl(CategoryImplementation[i]);
}
void RewriteObjC::SynthesizeMetaDataIntoBuffer(std::string &Result) {
int ClsDefCount = ClassImplementation.size();
int CatDefCount = CategoryImplementation.size();
// This is needed for determining instance variable offsets.
Result += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)\n";
// For each implemented class, write out all its meta data.
for (int i = 0; i < ClsDefCount; i++)
RewriteObjCClassMetaData(ClassImplementation[i], Result);
// For each implemented category, write out all its meta data.
for (int i = 0; i < CatDefCount; i++)
RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
// Write objc_symtab metadata
/*
struct _objc_symtab
{
long sel_ref_cnt;
SEL *refs;
short cls_def_cnt;
short cat_def_cnt;
void *defs[cls_def_cnt + cat_def_cnt];
};
*/
Result += "\nstruct _objc_symtab {\n";
Result += "\tlong sel_ref_cnt;\n";
Result += "\tSEL *refs;\n";
Result += "\tshort cls_def_cnt;\n";
Result += "\tshort cat_def_cnt;\n";
Result += "\tvoid *defs[" + utostr(ClsDefCount + CatDefCount)+ "];\n";
Result += "};\n\n";
Result += "static struct _objc_symtab "
"_OBJC_SYMBOLS __attribute__((used, section (\"__OBJC, __symbols\")))= {\n";
Result += "\t0, 0, " + utostr(ClsDefCount)
+ ", " + utostr(CatDefCount) + "\n";
for (int i = 0; i < ClsDefCount; i++) {
Result += "\t,&_OBJC_CLASS_";
Result += ClassImplementation[i]->getNameAsString();
Result += "\n";
}
for (int i = 0; i < CatDefCount; i++) {
Result += "\t,&_OBJC_CATEGORY_";
Result += CategoryImplementation[i]->getClassInterface()->getNameAsString();
Result += "_";
Result += CategoryImplementation[i]->getNameAsString();
Result += "\n";
}
Result += "};\n\n";
// Write objc_module metadata
/*
struct _objc_module {
long version;
long size;
const char *name;
struct _objc_symtab *symtab;
}
*/
Result += "\nstruct _objc_module {\n";
Result += "\tlong version;\n";
Result += "\tlong size;\n";
Result += "\tconst char *name;\n";
Result += "\tstruct _objc_symtab *symtab;\n";
Result += "};\n\n";
Result += "static struct _objc_module "
"_OBJC_MODULES __attribute__ ((used, section (\"__OBJC, __module_info\")))= {\n";
Result += "\t" + utostr(OBJC_ABI_VERSION) +
", sizeof(struct _objc_module), \"\", &_OBJC_SYMBOLS\n";
Result += "};\n\n";
if (LangOpts.Microsoft) {
Result += "#pragma section(\".objc_module_info$B\",long,read,write)\n";
Result += "#pragma data_seg(push, \".objc_module_info$B\")\n";
Result += "static struct _objc_module *_POINTER_OBJC_MODULES = ";
Result += "&_OBJC_MODULES;\n";
Result += "#pragma data_seg(pop)\n\n";
}
}
std::string RewriteObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
const char *funcName,
std::string Tag) {
const FunctionType *AFT = CE->getFunctionType();
QualType RT = AFT->getResultType();
std::string StructRef = "struct " + Tag;
std::string S = "static " + RT.getAsString() + " __" +
funcName + "_" + "block_func_" + utostr(i);
BlockDecl *BD = CE->getBlockDecl();
if (isa<FunctionNoProtoType>(AFT)) {
// No user-supplied arguments. Still need to pass in a pointer to the
// block (to reference imported block decl refs).
S += "(" + StructRef + " *__cself)";
} else if (BD->param_empty()) {
S += "(" + StructRef + " *__cself)";
} else {
const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
assert(FT && "SynthesizeBlockFunc: No function proto");
S += '(';
// first add the implicit argument.
S += StructRef + " *__cself, ";
std::string ParamStr;
for (BlockDecl::param_iterator AI = BD->param_begin(),
E = BD->param_end(); AI != E; ++AI) {
if (AI != BD->param_begin()) S += ", ";
ParamStr = (*AI)->getNameAsString();
(*AI)->getType().getAsStringInternal(ParamStr);
S += ParamStr;
}
if (FT->isVariadic()) {
if (!BD->param_empty()) S += ", ";
S += "...";
}
S += ')';
}
S += " {\n";
// Create local declarations to avoid rewriting all closure decl ref exprs.
// First, emit a declaration for all "by ref" decls.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
S += " ";
std::string Name = (*I)->getNameAsString();
Context->getPointerType((*I)->getType()).getAsStringInternal(Name);
S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
}
// Next, emit a declaration for all "by copy" declarations.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
S += " ";
std::string Name = (*I)->getNameAsString();
// Handle nested closure invocation. For example:
//
// void (^myImportedClosure)(void);
// myImportedClosure = ^(void) { setGlobalInt(x + y); };
//
// void (^anotherClosure)(void);
// anotherClosure = ^(void) {
// myImportedClosure(); // import and invoke the closure
// };
//
if (isTopLevelBlockPointerType((*I)->getType()))
S += "struct __block_impl *";
else
(*I)->getType().getAsStringInternal(Name);
S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
}
std::string RewrittenStr = RewrittenBlockExprs[CE];
const char *cstr = RewrittenStr.c_str();
while (*cstr++ != '{') ;
S += cstr;
S += "\n";
return S;
}
std::string RewriteObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
const char *funcName,
std::string Tag) {
std::string StructRef = "struct " + Tag;
std::string S = "static void __";
S += funcName;
S += "_block_copy_" + utostr(i);
S += "(" + StructRef;
S += "*dst, " + StructRef;
S += "*src) {";
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
E = ImportedBlockDecls.end(); I != E; ++I) {
S += "_Block_object_assign((void*)&dst->";
S += (*I)->getNameAsString();
S += ", (void*)src->";
S += (*I)->getNameAsString();
S += ", 3/*BLOCK_FIELD_IS_OBJECT*/);}";
}
S += "\nstatic void __";
S += funcName;
S += "_block_dispose_" + utostr(i);
S += "(" + StructRef;
S += "*src) {";
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
E = ImportedBlockDecls.end(); I != E; ++I) {
S += "_Block_object_dispose((void*)src->";
S += (*I)->getNameAsString();
S += ", 3/*BLOCK_FIELD_IS_OBJECT*/);";
}
S += "}\n";
return S;
}
std::string RewriteObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
bool hasCopyDisposeHelpers) {
std::string S = "\nstruct " + Tag;
std::string Constructor = " " + Tag;
S += " {\n struct __block_impl impl;\n";
if (hasCopyDisposeHelpers)
S += " void *copy;\n void *dispose;\n";
Constructor += "(void *fp";
if (hasCopyDisposeHelpers)
Constructor += ", void *copyHelp, void *disposeHelp";
if (BlockDeclRefs.size()) {
// Output all "by copy" declarations.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
S += " ";
std::string FieldName = (*I)->getNameAsString();
std::string ArgName = "_" + FieldName;
// Handle nested closure invocation. For example:
//
// void (^myImportedBlock)(void);
// myImportedBlock = ^(void) { setGlobalInt(x + y); };
//
// void (^anotherBlock)(void);
// anotherBlock = ^(void) {
// myImportedBlock(); // import and invoke the closure
// };
//
if (isTopLevelBlockPointerType((*I)->getType())) {
S += "struct __block_impl *";
Constructor += ", void *" + ArgName;
} else {
(*I)->getType().getAsStringInternal(FieldName);
(*I)->getType().getAsStringInternal(ArgName);
Constructor += ", " + ArgName;
}
S += FieldName + ";\n";
}
// Output all "by ref" declarations.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
S += " ";
std::string FieldName = (*I)->getNameAsString();
std::string ArgName = "_" + FieldName;
// Handle nested closure invocation. For example:
//
// void (^myImportedBlock)(void);
// myImportedBlock = ^(void) { setGlobalInt(x + y); };
//
// void (^anotherBlock)(void);
// anotherBlock = ^(void) {
// myImportedBlock(); // import and invoke the closure
// };
//
if (isTopLevelBlockPointerType((*I)->getType())) {
S += "struct __block_impl *";
Constructor += ", void *" + ArgName;
} else {
Context->getPointerType((*I)->getType()).getAsStringInternal(FieldName);
Context->getPointerType((*I)->getType()).getAsStringInternal(ArgName);
Constructor += ", " + ArgName;
}
S += FieldName + "; // by ref\n";
}
// Finish writing the constructor.
// FIXME: handle NSConcreteGlobalBlock.
Constructor += ", int flags=0) {\n";
Constructor += " impl.isa = 0/*&_NSConcreteStackBlock*/;\n impl.Size = sizeof(";
Constructor += Tag + ");\n impl.Flags = flags;\n impl.FuncPtr = fp;\n";
if (hasCopyDisposeHelpers)
Constructor += " copy = copyHelp;\n dispose = disposeHelp;\n";
// Initialize all "by copy" arguments.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
std::string Name = (*I)->getNameAsString();
Constructor += " ";
if (isTopLevelBlockPointerType((*I)->getType()))
Constructor += Name + " = (struct __block_impl *)_";
else
Constructor += Name + " = _";
Constructor += Name + ";\n";
}
// Initialize all "by ref" arguments.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
std::string Name = (*I)->getNameAsString();
Constructor += " ";
if (isTopLevelBlockPointerType((*I)->getType()))
Constructor += Name + " = (struct __block_impl *)_";
else
Constructor += Name + " = _";
Constructor += Name + ";\n";
}
} else {
// Finish writing the constructor.
// FIXME: handle NSConcreteGlobalBlock.
Constructor += ", int flags=0) {\n";
Constructor += " impl.isa = 0/*&_NSConcreteStackBlock*/;\n impl.Size = sizeof(";
Constructor += Tag + ");\n impl.Flags = flags;\n impl.FuncPtr = fp;\n";
if (hasCopyDisposeHelpers)
Constructor += " copy = copyHelp;\n dispose = disposeHelp;\n";
}
Constructor += " ";
Constructor += "}\n";
S += Constructor;
S += "};\n";
return S;
}
void RewriteObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
const char *FunName) {
// Insert closures that were part of the function.
for (unsigned i = 0; i < Blocks.size(); i++) {
CollectBlockDeclRefInfo(Blocks[i]);
std::string Tag = "__" + std::string(FunName) + "_block_impl_" + utostr(i);
std::string CI = SynthesizeBlockImpl(Blocks[i], Tag,
ImportedBlockDecls.size() > 0);
InsertText(FunLocStart, CI.c_str(), CI.size());
std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, Tag);
InsertText(FunLocStart, CF.c_str(), CF.size());
if (ImportedBlockDecls.size()) {
std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, Tag);
InsertText(FunLocStart, HF.c_str(), HF.size());
}
BlockDeclRefs.clear();
BlockByRefDecls.clear();
BlockByCopyDecls.clear();
BlockCallExprs.clear();
ImportedBlockDecls.clear();
}
Blocks.clear();
RewrittenBlockExprs.clear();
}
void RewriteObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
const char *FuncName = FD->getNameAsCString();
SynthesizeBlockLiterals(FunLocStart, FuncName);
}
void RewriteObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
//fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
//SourceLocation FunLocStart = MD->getLocStart();
// FIXME: This hack works around a bug in Rewrite.InsertText().
SourceLocation FunLocStart = MD->getLocStart().getFileLocWithOffset(-1);
std::string FuncName = MD->getSelector().getAsString();
// Convert colons to underscores.
std::string::size_type loc = 0;
while ((loc = FuncName.find(":", loc)) != std::string::npos)
FuncName.replace(loc, 1, "_");
SynthesizeBlockLiterals(FunLocStart, FuncName.c_str());
}
void RewriteObjC::GetBlockDeclRefExprs(Stmt *S) {
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end();
CI != E; ++CI)
if (*CI) {
if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI))
GetBlockDeclRefExprs(CBE->getBody());
else
GetBlockDeclRefExprs(*CI);
}
// Handle specific things.
if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(S))
// FIXME: Handle enums.
if (!isa<FunctionDecl>(CDRE->getDecl()))
BlockDeclRefs.push_back(CDRE);
return;
}
void RewriteObjC::GetBlockCallExprs(Stmt *S) {
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end();
CI != E; ++CI)
if (*CI) {
if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI))
GetBlockCallExprs(CBE->getBody());
else
GetBlockCallExprs(*CI);
}
if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
if (CE->getCallee()->getType()->isBlockPointerType()) {
BlockCallExprs[dyn_cast<BlockDeclRefExpr>(CE->getCallee())] = CE;
}
}
return;
}
Stmt *RewriteObjC::SynthesizeBlockCall(CallExpr *Exp) {
// Navigate to relevant type information.
const char *closureName = 0;
const BlockPointerType *CPT = 0;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Exp->getCallee())) {
closureName = DRE->getDecl()->getNameAsCString();
CPT = DRE->getType()->getAsBlockPointerType();
} else if (BlockDeclRefExpr *CDRE = dyn_cast<BlockDeclRefExpr>(Exp->getCallee())) {
closureName = CDRE->getDecl()->getNameAsCString();
CPT = CDRE->getType()->getAsBlockPointerType();
} else if (MemberExpr *MExpr = dyn_cast<MemberExpr>(Exp->getCallee())) {
closureName = MExpr->getMemberDecl()->getNameAsCString();
CPT = MExpr->getType()->getAsBlockPointerType();
} else {
assert(1 && "RewriteBlockClass: Bad type");
}
assert(CPT && "RewriteBlockClass: Bad type");
const FunctionType *FT = CPT->getPointeeType()->getAsFunctionType();
assert(FT && "RewriteBlockClass: Bad type");
const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
// FTP will be null for closures that don't take arguments.
RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
SourceLocation(),
&Context->Idents.get("__block_impl"));
QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
// Generate a funky cast.
llvm::SmallVector<QualType, 8> ArgTypes;
// Push the block argument type.
ArgTypes.push_back(PtrBlock);
if (FTP) {
for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
E = FTP->arg_type_end(); I && (I != E); ++I) {
QualType t = *I;
// Make sure we convert "t (^)(...)" to "t (*)(...)".
if (isTopLevelBlockPointerType(t)) {
const BlockPointerType *BPT = t->getAsBlockPointerType();
t = Context->getPointerType(BPT->getPointeeType());
}
ArgTypes.push_back(t);
}
}
// Now do the pointer to function cast.
QualType PtrToFuncCastType = Context->getFunctionType(Exp->getType(),
&ArgTypes[0], ArgTypes.size(), false/*no variadic*/, 0);
PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
CastExpr *BlkCast = new (Context) CStyleCastExpr(PtrBlock, Exp->getCallee(),
PtrBlock, SourceLocation(),
SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
BlkCast);
//PE->dump();
FieldDecl *FD = FieldDecl::Create(*Context, 0, SourceLocation(),
&Context->Idents.get("FuncPtr"), Context->VoidPtrTy,
/*BitWidth=*/0, /*Mutable=*/true);
MemberExpr *ME = new (Context) MemberExpr(PE, true, FD, SourceLocation(),
FD->getType());
CastExpr *FunkCast = new (Context) CStyleCastExpr(PtrToFuncCastType, ME,
PtrToFuncCastType,
SourceLocation(),
SourceLocation());
PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
llvm::SmallVector<Expr*, 8> BlkExprs;
// Add the implicit argument.
BlkExprs.push_back(BlkCast);
// Add the user arguments.
for (CallExpr::arg_iterator I = Exp->arg_begin(),
E = Exp->arg_end(); I != E; ++I) {
BlkExprs.push_back(*I);
}
CallExpr *CE = new (Context) CallExpr(*Context, PE, &BlkExprs[0],
BlkExprs.size(),
Exp->getType(), SourceLocation());
return CE;
}
void RewriteObjC::RewriteBlockCall(CallExpr *Exp) {
Stmt *BlockCall = SynthesizeBlockCall(Exp);
ReplaceStmt(Exp, BlockCall);
}
void RewriteObjC::RewriteBlockDeclRefExpr(BlockDeclRefExpr *BDRE) {
// FIXME: Add more elaborate code generation required by the ABI.
Expr *DerefExpr = new (Context) UnaryOperator(BDRE, UnaryOperator::Deref,
Context->getPointerType(BDRE->getType()),
SourceLocation());
// Need parens to enforce precedence.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), DerefExpr);
ReplaceStmt(BDRE, PE);
}
void RewriteObjC::RewriteCastExpr(CStyleCastExpr *CE) {
SourceLocation LocStart = CE->getLParenLoc();
SourceLocation LocEnd = CE->getRParenLoc();
// Need to avoid trying to rewrite synthesized casts.
if (LocStart.isInvalid())
return;
// Need to avoid trying to rewrite casts contained in macros.
if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
return;
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
// advance the location to startArgList.
const char *argPtr = startBuf;
while (*argPtr++ && (argPtr < endBuf)) {
switch (*argPtr) {
case '^':
// Replace the '^' with '*'.
LocStart = LocStart.getFileLocWithOffset(argPtr-startBuf);
ReplaceText(LocStart, 1, "*", 1);
break;
}
}
return;
}
void RewriteObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
SourceLocation DeclLoc = FD->getLocation();
unsigned parenCount = 0;
// We have 1 or more arguments that have closure pointers.
const char *startBuf = SM->getCharacterData(DeclLoc);
const char *startArgList = strchr(startBuf, '(');
assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
parenCount++;
// advance the location to startArgList.
DeclLoc = DeclLoc.getFileLocWithOffset(startArgList-startBuf);
assert((DeclLoc.isValid()) && "Invalid DeclLoc");
const char *argPtr = startArgList;
while (*argPtr++ && parenCount) {
switch (*argPtr) {
case '^':
// Replace the '^' with '*'.
DeclLoc = DeclLoc.getFileLocWithOffset(argPtr-startArgList);
ReplaceText(DeclLoc, 1, "*", 1);
break;
case '(':
parenCount++;
break;
case ')':
parenCount--;
break;
}
}
return;
}
bool RewriteObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
const FunctionProtoType *FTP;
const PointerType *PT = QT->getAsPointerType();
if (PT) {
FTP = PT->getPointeeType()->getAsFunctionProtoType();
} else {
const BlockPointerType *BPT = QT->getAsBlockPointerType();
assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
FTP = BPT->getPointeeType()->getAsFunctionProtoType();
}
if (FTP) {
for (FunctionProtoType::arg_type_iterator I = FTP->arg_type_begin(),
E = FTP->arg_type_end(); I != E; ++I)
if (isTopLevelBlockPointerType(*I))
return true;
}
return false;
}
void RewriteObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
const char *&RParen) {
const char *argPtr = strchr(Name, '(');
assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
LParen = argPtr; // output the start.
argPtr++; // skip past the left paren.
unsigned parenCount = 1;
while (*argPtr && parenCount) {
switch (*argPtr) {
case '(': parenCount++; break;
case ')': parenCount--; break;
default: break;
}
if (parenCount) argPtr++;
}
assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
RParen = argPtr; // output the end
}
void RewriteObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
RewriteBlockPointerFunctionArgs(FD);
return;
}
// Handle Variables and Typedefs.
SourceLocation DeclLoc = ND->getLocation();
QualType DeclT;
if (VarDecl *VD = dyn_cast<VarDecl>(ND))
DeclT = VD->getType();
else if (TypedefDecl *TDD = dyn_cast<TypedefDecl>(ND))
DeclT = TDD->getUnderlyingType();
else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
DeclT = FD->getType();
else
assert(0 && "RewriteBlockPointerDecl(): Decl type not yet handled");
const char *startBuf = SM->getCharacterData(DeclLoc);
const char *endBuf = startBuf;
// scan backward (from the decl location) for the end of the previous decl.
while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
startBuf--;
// *startBuf != '^' if we are dealing with a pointer to function that
// may take block argument types (which will be handled below).
if (*startBuf == '^') {
// Replace the '^' with '*', computing a negative offset.
DeclLoc = DeclLoc.getFileLocWithOffset(startBuf-endBuf);
ReplaceText(DeclLoc, 1, "*", 1);
}
if (PointerTypeTakesAnyBlockArguments(DeclT)) {
// Replace the '^' with '*' for arguments.
DeclLoc = ND->getLocation();
startBuf = SM->getCharacterData(DeclLoc);
const char *argListBegin, *argListEnd;
GetExtentOfArgList(startBuf, argListBegin, argListEnd);
while (argListBegin < argListEnd) {
if (*argListBegin == '^') {
SourceLocation CaretLoc = DeclLoc.getFileLocWithOffset(argListBegin-startBuf);
ReplaceText(CaretLoc, 1, "*", 1);
}
argListBegin++;
}
}
return;
}
void RewriteObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
// Add initializers for any closure decl refs.
GetBlockDeclRefExprs(Exp->getBody());
if (BlockDeclRefs.size()) {
// Unique all "by copy" declarations.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (!BlockDeclRefs[i]->isByRef())
BlockByCopyDecls.insert(BlockDeclRefs[i]->getDecl());
// Unique all "by ref" declarations.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (BlockDeclRefs[i]->isByRef()) {
BlockByRefDecls.insert(BlockDeclRefs[i]->getDecl());
}
// Find any imported blocks...they will need special attention.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (BlockDeclRefs[i]->getType()->isBlockPointerType()) {
GetBlockCallExprs(BlockDeclRefs[i]);
ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
}
}
}
FunctionDecl *RewriteObjC::SynthBlockInitFunctionDecl(const char *name) {
IdentifierInfo *ID = &Context->Idents.get(name);
QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
return FunctionDecl::Create(*Context, TUDecl,SourceLocation(),
ID, FType, FunctionDecl::Extern, false,
false);
}
Stmt *RewriteObjC::SynthBlockInitExpr(BlockExpr *Exp) {
Blocks.push_back(Exp);
CollectBlockDeclRefInfo(Exp);
std::string FuncName;
if (CurFunctionDef)
FuncName = CurFunctionDef->getNameAsString();
else if (CurMethodDef) {
FuncName = CurMethodDef->getSelector().getAsString();
// Convert colons to underscores.
std::string::size_type loc = 0;
while ((loc = FuncName.find(":", loc)) != std::string::npos)
FuncName.replace(loc, 1, "_");
} else if (GlobalVarDecl)
FuncName = std::string(GlobalVarDecl->getNameAsString());
std::string BlockNumber = utostr(Blocks.size()-1);
std::string Tag = "__" + FuncName + "_block_impl_" + BlockNumber;
std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
// Get a pointer to the function type so we can cast appropriately.
QualType FType = Context->getPointerType(QualType(Exp->getFunctionType(),0));
FunctionDecl *FD;
Expr *NewRep;
// Simulate a contructor call...
FD = SynthBlockInitFunctionDecl(Tag.c_str());
DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, FType, SourceLocation());
llvm::SmallVector<Expr*, 4> InitExprs;
// Initialize the block function.
FD = SynthBlockInitFunctionDecl(Func.c_str());
DeclRefExpr *Arg = new (Context) DeclRefExpr(FD, FD->getType(),
SourceLocation());
CastExpr *castExpr = new (Context) CStyleCastExpr(Context->VoidPtrTy, Arg,
Context->VoidPtrTy, SourceLocation(),
SourceLocation());
InitExprs.push_back(castExpr);
if (ImportedBlockDecls.size()) {
std::string Buf = "__" + FuncName + "_block_copy_" + BlockNumber;
FD = SynthBlockInitFunctionDecl(Buf.c_str());
Arg = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
castExpr = new (Context) CStyleCastExpr(Context->VoidPtrTy, Arg,
Context->VoidPtrTy, SourceLocation(),
SourceLocation());
InitExprs.push_back(castExpr);
Buf = "__" + FuncName + "_block_dispose_" + BlockNumber;
FD = SynthBlockInitFunctionDecl(Buf.c_str());
Arg = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
castExpr = new (Context) CStyleCastExpr(Context->VoidPtrTy, Arg,
Context->VoidPtrTy, SourceLocation(),
SourceLocation());
InitExprs.push_back(castExpr);
}
// Add initializers for any closure decl refs.
if (BlockDeclRefs.size()) {
Expr *Exp;
// Output all "by copy" declarations.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
if (isObjCType((*I)->getType())) {
// FIXME: Conform to ABI ([[obj retain] autorelease]).
FD = SynthBlockInitFunctionDecl((*I)->getNameAsCString());
Exp = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
} else if (isTopLevelBlockPointerType((*I)->getType())) {
FD = SynthBlockInitFunctionDecl((*I)->getNameAsCString());
Arg = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
Exp = new (Context) CStyleCastExpr(Context->VoidPtrTy, Arg,
Context->VoidPtrTy, SourceLocation(),
SourceLocation());
} else {
FD = SynthBlockInitFunctionDecl((*I)->getNameAsCString());
Exp = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
}
InitExprs.push_back(Exp);
}
// Output all "by ref" declarations.
for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
FD = SynthBlockInitFunctionDecl((*I)->getNameAsCString());
Exp = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
Exp = new (Context) UnaryOperator(Exp, UnaryOperator::AddrOf,
Context->getPointerType(Exp->getType()),
SourceLocation());
InitExprs.push_back(Exp);
}
}
NewRep = new (Context) CallExpr(*Context, DRE, &InitExprs[0], InitExprs.size(),
FType, SourceLocation());
NewRep = new (Context) UnaryOperator(NewRep, UnaryOperator::AddrOf,
Context->getPointerType(NewRep->getType()),
SourceLocation());
NewRep = new (Context) CStyleCastExpr(FType, NewRep, FType, SourceLocation(),
SourceLocation());
BlockDeclRefs.clear();
BlockByRefDecls.clear();
BlockByCopyDecls.clear();
ImportedBlockDecls.clear();
return NewRep;
}
//===----------------------------------------------------------------------===//
// Function Body / Expression rewriting
//===----------------------------------------------------------------------===//
// This is run as a first "pass" prior to RewriteFunctionBodyOrGlobalInitializer().
// The allows the main rewrite loop to associate all ObjCPropertyRefExprs with
// their respective BinaryOperator. Without this knowledge, we'd need to rewrite
// the ObjCPropertyRefExpr twice (once as a getter, and later as a setter).
// Since the rewriter isn't capable of rewriting rewritten code, it's important
// we get this right.
void RewriteObjC::CollectPropertySetters(Stmt *S) {
// Perform a bottom up traversal of all children.
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end();
CI != E; ++CI)
if (*CI)
CollectPropertySetters(*CI);
if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(S)) {
if (BinOp->isAssignmentOp()) {
if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(BinOp->getLHS()))
PropSetters[PRE] = BinOp;
}
}
}
Stmt *RewriteObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
isa<DoStmt>(S) || isa<ForStmt>(S))
Stmts.push_back(S);
else if (isa<ObjCForCollectionStmt>(S)) {
Stmts.push_back(S);
ObjCBcLabelNo.push_back(++BcLabelCount);
}
SourceRange OrigStmtRange = S->getSourceRange();
// Perform a bottom up rewrite of all children.
for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end();
CI != E; ++CI)
if (*CI) {
Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(*CI);
if (newStmt)
*CI = newStmt;
}
if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
// Rewrite the block body in place.
RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
// Now we snarf the rewritten text and stash it away for later use.
std::string Str = Rewrite.getRewritenText(BE->getSourceRange());
RewrittenBlockExprs[BE] = Str;
Stmt *blockTranscribed = SynthBlockInitExpr(BE);
//blockTranscribed->dump();
ReplaceStmt(S, blockTranscribed);
return blockTranscribed;
}
// Handle specific things.
if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
return RewriteAtEncode(AtEncode);
if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S))
return RewriteObjCIvarRefExpr(IvarRefExpr, OrigStmtRange.getBegin());
if (ObjCPropertyRefExpr *PropRefExpr = dyn_cast<ObjCPropertyRefExpr>(S)) {
BinaryOperator *BinOp = PropSetters[PropRefExpr];
if (BinOp) {
// Because the rewriter doesn't allow us to rewrite rewritten code,
// we need to rewrite the right hand side prior to rewriting the setter.
DisableReplaceStmt = true;
// Save the source range. Even if we disable the replacement, the
// rewritten node will have been inserted into the tree. If the synthesized
// node is at the 'end', the rewriter will fail. Consider this:
// self.errorHandler = handler ? handler :
// ^(NSURL *errorURL, NSError *error) { return (BOOL)1; };
SourceRange SrcRange = BinOp->getSourceRange();
Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(BinOp->getRHS());
DisableReplaceStmt = false;
//
// Unlike the main iterator, we explicily avoid changing 'BinOp'. If
// we changed the RHS of BinOp, the rewriter would fail (since it needs
// to see the original expression). Consider this example:
//
// Foo *obj1, *obj2;
//
// obj1.i = [obj2 rrrr];
//
// 'BinOp' for the previous expression looks like:
//
// (BinaryOperator 0x231ccf0 'int' '='
// (ObjCPropertyRefExpr 0x231cc70 'int' Kind=PropertyRef Property="i"
// (DeclRefExpr 0x231cc50 'Foo *' Var='obj1' 0x231cbb0))
// (ObjCMessageExpr 0x231ccb0 'int' selector=rrrr
// (DeclRefExpr 0x231cc90 'Foo *' Var='obj2' 0x231cbe0)))
//
// 'newStmt' represents the rewritten message expression. For example:
//
// (CallExpr 0x231d300 'id':'struct objc_object *'
// (ParenExpr 0x231d2e0 'int (*)(id, SEL)'
// (CStyleCastExpr 0x231d2c0 'int (*)(id, SEL)'
// (CStyleCastExpr 0x231d220 'void *'
// (DeclRefExpr 0x231d200 'id (id, SEL, ...)' FunctionDecl='objc_msgSend' 0x231cdc0))))
//
// Note that 'newStmt' is passed to RewritePropertySetter so that it
// can be used as the setter argument. ReplaceStmt() will still 'see'
// the original RHS (since we haven't altered BinOp).
//
// This implies the Rewrite* routines can no longer delete the original
// node. As a result, we now leak the original AST nodes.
//
return RewritePropertySetter(BinOp, dyn_cast<Expr>(newStmt), SrcRange);
} else {
return RewritePropertyGetter(PropRefExpr);
}
}
if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
return RewriteAtSelector(AtSelector);
if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
return RewriteObjCStringLiteral(AtString);
if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
#if 0
// Before we rewrite it, put the original message expression in a comment.
SourceLocation startLoc = MessExpr->getLocStart();
SourceLocation endLoc = MessExpr->getLocEnd();
const char *startBuf = SM->getCharacterData(startLoc);
const char *endBuf = SM->getCharacterData(endLoc);
std::string messString;
messString += "// ";
messString.append(startBuf, endBuf-startBuf+1);
messString += "\n";
// FIXME: Missing definition of
// InsertText(clang::SourceLocation, char const*, unsigned int).
// InsertText(startLoc, messString.c_str(), messString.size());
// Tried this, but it didn't work either...
// ReplaceText(startLoc, 0, messString.c_str(), messString.size());
#endif
return RewriteMessageExpr(MessExpr);
}
if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
return RewriteObjCTryStmt(StmtTry);
if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
return RewriteObjCSynchronizedStmt(StmtTry);
if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
return RewriteObjCThrowStmt(StmtThrow);
if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
return RewriteObjCProtocolExpr(ProtocolExp);
if (ObjCForCollectionStmt *StmtForCollection =
dyn_cast<ObjCForCollectionStmt>(S))
return RewriteObjCForCollectionStmt(StmtForCollection,
OrigStmtRange.getEnd());
if (BreakStmt *StmtBreakStmt =
dyn_cast<BreakStmt>(S))
return RewriteBreakStmt(StmtBreakStmt);
if (ContinueStmt *StmtContinueStmt =
dyn_cast<ContinueStmt>(S))
return RewriteContinueStmt(StmtContinueStmt);
// Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
// and cast exprs.
if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
// FIXME: What we're doing here is modifying the type-specifier that
// precedes the first Decl. In the future the DeclGroup should have
// a separate type-specifier that we can rewrite.
RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
// Blocks rewrite rules.
for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
DI != DE; ++DI) {
Decl *SD = *DI;
if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
if (isTopLevelBlockPointerType(ND->getType()))
RewriteBlockPointerDecl(ND);
else if (ND->getType()->isFunctionPointerType())
CheckFunctionPointerDecl(ND->getType(), ND);
}
if (TypedefDecl *TD = dyn_cast<TypedefDecl>(SD)) {
if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
RewriteBlockPointerDecl(TD);
else if (TD->getUnderlyingType()->isFunctionPointerType())
CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
}
}
}
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
RewriteObjCQualifiedInterfaceTypes(CE);
if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
isa<DoStmt>(S) || isa<ForStmt>(S)) {
assert(!Stmts.empty() && "Statement stack is empty");
assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
&& "Statement stack mismatch");
Stmts.pop_back();
}
// Handle blocks rewriting.
if (BlockDeclRefExpr *BDRE = dyn_cast<BlockDeclRefExpr>(S)) {
if (BDRE->isByRef())
RewriteBlockDeclRefExpr(BDRE);
}
if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
if (CE->getCallee()->getType()->isBlockPointerType()) {
Stmt *BlockCall = SynthesizeBlockCall(CE);
ReplaceStmt(S, BlockCall);
return BlockCall;
}
}
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
RewriteCastExpr(CE);
}
#if 0
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
CastExpr *Replacement = new (Context) CastExpr(ICE->getType(), ICE->getSubExpr(), SourceLocation());
// Get the new text.
std::string SStr;
llvm::raw_string_ostream Buf(SStr);
Replacement->printPretty(Buf);
const std::string &Str = Buf.str();
printf("CAST = %s\n", &Str[0]);
InsertText(ICE->getSubExpr()->getLocStart(), &Str[0], Str.size());
delete S;
return Replacement;
}
#endif
// Return this stmt unmodified.
return S;
}
/// HandleDeclInMainFile - This is called for each top-level decl defined in the
/// main file of the input.
void RewriteObjC::HandleDeclInMainFile(Decl *D) {
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
if (FD->isOverloadedOperator())
return;
// Since function prototypes don't have ParmDecl's, we check the function
// prototype. This enables us to rewrite function declarations and
// definitions using the same code.
RewriteBlocksInFunctionProtoType(FD->getType(), FD);
if (Stmt *Body = FD->getBody()) {
CurFunctionDef = FD;
CollectPropertySetters(Body);
CurrentBody = Body;
FD->setBody(RewriteFunctionBodyOrGlobalInitializer(Body));
CurrentBody = 0;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = 0;
}
// This synthesizes and inserts the block "impl" struct, invoke function,
// and any copy/dispose helper functions.
InsertBlockLiteralsWithinFunction(FD);
CurFunctionDef = 0;
}
return;
}
if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
if (Stmt *Body = MD->getBody()) {
CurMethodDef = MD;
CollectPropertySetters(Body);
CurrentBody = Body;
MD->setBody(RewriteFunctionBodyOrGlobalInitializer(Body));
CurrentBody = 0;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = 0;
}
InsertBlockLiteralsWithinMethod(MD);
CurMethodDef = 0;
}
}
if (ObjCImplementationDecl *CI = dyn_cast<ObjCImplementationDecl>(D))
ClassImplementation.push_back(CI);
else if (ObjCCategoryImplDecl *CI = dyn_cast<ObjCCategoryImplDecl>(D))
CategoryImplementation.push_back(CI);
else if (ObjCClassDecl *CD = dyn_cast<ObjCClassDecl>(D))
RewriteForwardClassDecl(CD);
else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
RewriteObjCQualifiedInterfaceTypes(VD);
if (isTopLevelBlockPointerType(VD->getType()))
RewriteBlockPointerDecl(VD);
else if (VD->getType()->isFunctionPointerType()) {
CheckFunctionPointerDecl(VD->getType(), VD);
if (VD->getInit()) {
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
RewriteCastExpr(CE);
}
}
}
if (VD->getInit()) {
GlobalVarDecl = VD;
CollectPropertySetters(VD->getInit());
CurrentBody = VD->getInit();
RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
CurrentBody = 0;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = 0;
}
SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(),
VD->getNameAsCString());
GlobalVarDecl = 0;
// This is needed for blocks.
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
RewriteCastExpr(CE);
}
}
return;
}
if (TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) {
if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
RewriteBlockPointerDecl(TD);
else if (TD->getUnderlyingType()->isFunctionPointerType())
CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
return;
}
if (RecordDecl *RD = dyn_cast<RecordDecl>(D)) {
if (RD->isDefinition()) {
for (RecordDecl::field_iterator i = RD->field_begin(),
e = RD->field_end(); i != e; ++i) {
FieldDecl *FD = *i;
if (isTopLevelBlockPointerType(FD->getType()))
RewriteBlockPointerDecl(FD);
}
}
return;
}
// Nothing yet.
}
void RewriteObjC::HandleTranslationUnit(TranslationUnit& TU) {
// Get the top-level buffer that this corresponds to.
// Rewrite tabs if we care.
//RewriteTabs();
if (Diags.hasErrorOccurred())
return;
// Create the output file.
llvm::OwningPtr<llvm::raw_ostream> OwnedStream;
llvm::raw_ostream *OutFile;
if (OutFileName == "-") {
OutFile = &llvm::outs();
} else if (!OutFileName.empty()) {
std::string Err;
OutFile = new llvm::raw_fd_ostream(OutFileName.c_str(),
// set binary mode (critical for Windoze)
true,
Err);
OwnedStream.reset(OutFile);
} else if (InFileName == "-") {
OutFile = &llvm::outs();
} else {
llvm::sys::Path Path(InFileName);
Path.eraseSuffix();
Path.appendSuffix("cpp");
std::string Err;
OutFile = new llvm::raw_fd_ostream(Path.toString().c_str(),
// set binary mode (critical for Windoze)
true,
Err);
OwnedStream.reset(OutFile);
}
RewriteInclude();
InsertText(SM->getLocForStartOfFile(MainFileID),
Preamble.c_str(), Preamble.size(), false);
if (ClassImplementation.size() || CategoryImplementation.size())
RewriteImplementations();
// Get the buffer corresponding to MainFileID. If we haven't changed it, then
// we are done.
if (const RewriteBuffer *RewriteBuf =
Rewrite.getRewriteBufferFor(MainFileID)) {
//printf("Changed:\n");
*OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
} else {
fprintf(stderr, "No changes\n");
}
if (ClassImplementation.size() || CategoryImplementation.size()) {
// Rewrite Objective-c meta data*
std::string ResultStr;
SynthesizeMetaDataIntoBuffer(ResultStr);
// Emit metadata.
*OutFile << ResultStr;
}
OutFile->flush();
}
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