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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/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/Support/MemoryBuffer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/System/Path.h"
#include <sstream>
#include <fstream>
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;
ASTContext *Context;
SourceManager *SM;
TranslationUnitDecl *TUDecl;
unsigned 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;
llvm::SmallVector<const RecordType *, 8> EncodingRecordTypes;
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 *CurMethodDecl;
RecordDecl *SuperStructDecl;
RecordDecl *ConstantStringDecl;
// Needed for header files being rewritten
bool IsHeader;
std::string InFileName;
std::string OutFileName;
std::string Preamble;
static const int OBJC_ABI_VERSION =7 ;
public:
void Initialize(ASTContext &context);
// 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();
void ReplaceStmt(Stmt *Old, Stmt *New) {
// If replacement succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceStmt(Old, New) || SilenceRewriteMacroWarning)
return;
SourceRange Range = Old->getSourceRange();
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag,
0, 0, &Range, 1);
}
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 RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
void RewriteImplementationDecl(NamedDecl *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 RewriteProperties(unsigned nProperties, ObjCPropertyDecl **Properties);
void RewriteFunctionDecl(FunctionDecl *FD);
void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
bool needToScanForQualifiers(QualType T);
ObjCInterfaceDecl *isSuperReceiver(Expr *recExpr);
QualType getSuperStructType();
QualType getConstantStringStructType();
// Expression Rewriting.
Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV);
Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
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(ObjCProtocolDecl **Protocols,
int NumProtocols,
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(std::string &Result);
};
}
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)");
}
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;
CurMethodDecl = 0;
SuperStructDecl = 0;
ConstantStringDecl = 0;
BcLabelCount = 0;
SuperContructorFunctionDecl = 0;
NumObjCStringLiterals = 0;
// 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 += "#ifndef OBJC_SUPER\n";
Preamble += "struct objc_super { struct objc_object *object; ";
Preamble += "struct objc_object *superClass; ";
if (LangOpts.Microsoft) {
// Add a constructor for creating temporary objects.
Preamble += "objc_super(struct objc_object *o, struct objc_object *s) : ";
Preamble += "object(o), superClass(s) {} ";
}
Preamble += "};\n";
Preamble += "#define OBJC_SUPER\n";
Preamble += "#endif\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_EXTERN extern \"C\" __declspec(dllimport)\n";
else
Preamble += "#define __OBJC_RW_EXTERN extern\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_msgSend";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_msgSendSuper";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_msgSend_stret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_msgSendSuper_stret";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_EXTERN double objc_msgSend_fpret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_getClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_getMetaClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_EXTERN void objc_exception_throw(struct objc_object *);\n";
Preamble += "__OBJC_RW_EXTERN void objc_exception_try_enter(void *);\n";
Preamble += "__OBJC_RW_EXTERN void objc_exception_try_exit(void *);\n";
Preamble += "__OBJC_RW_EXTERN struct objc_object *objc_exception_extract(void *);\n";
Preamble += "__OBJC_RW_EXTERN int objc_exception_match";
Preamble += "(struct objc_class *, struct objc_object *);\n";
Preamble += "__OBJC_RW_EXTERN Protocol *objc_getProtocol(const char *);\n";
if (LangOpts.Microsoft)
Preamble += "#undef __OBJC_RW_EXTERN\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 += "#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 += "extern int __CFConstantStringClassReference[];\n";
Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
Preamble += "#endif\n";
if (LangOpts.Microsoft)
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->getLogicalLoc(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->getName(), "_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);
}
// If we have a decl in the main file, see if we should rewrite it.
if (SM->isFromMainFile(Loc))
return HandleDeclInMainFile(D);
}
/// 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 (Stmt *Body = FD->getBody())
FD->setBody(RewriteFunctionBodyOrGlobalInitializer(Body));
if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
if (Stmt *Body = MD->getBody()) {
//Body->dump();
CurMethodDecl = MD;
MD->setBody(RewriteFunctionBodyOrGlobalInitializer(Body));
CurMethodDecl = 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 (VD->getInit())
RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
}
// Nothing yet.
}
RewriteObjC::~RewriteObjC() {
// Get the top-level buffer that this corresponds to.
// Rewrite tabs if we care.
//RewriteTabs();
if (Diags.hasErrorOccurred())
return;
// Create the output file.
std::ostream *OutFile;
if (OutFileName == "-") {
OutFile = llvm::cout.stream();
} else if (!OutFileName.empty()) {
OutFile = new std::ofstream(OutFileName.c_str(),
std::ios_base::binary|std::ios_base::out);
} else if (InFileName == "-") {
OutFile = llvm::cout.stream();
} else {
llvm::sys::Path Path(InFileName);
Path.eraseSuffix();
Path.appendSuffix("cpp");
OutFile = new std::ofstream(Path.toString().c_str(),
std::ios_base::binary|std::ios_base::out);
}
RewriteInclude();
InsertText(SourceLocation::getFileLoc(MainFileID, 0),
Preamble.c_str(), Preamble.size(), false);
// Rewrite Objective-c meta data*
std::string ResultStr;
RewriteImplementations(ResultStr);
// 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");
}
// Emit metadata.
*OutFile << ResultStr;
}
//===----------------------------------------------------------------------===//
// Syntactic (non-AST) Rewriting Code
//===----------------------------------------------------------------------===//
void RewriteObjC::RewriteInclude() {
SourceLocation LocStart = SourceLocation::getFileLoc(MainFileID, 0);
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 =
SourceLocation::getFileLoc(MainFileID, BufPtr-MainBufStart);
// Rewrite the single tab character into a sequence of spaces.
ReplaceText(TabLoc, 1, " ", Spaces);
}
}
void RewriteObjC::RewriteForwardClassDecl(ObjCClassDecl *ClassDecl) {
int numDecls = ClassDecl->getNumForwardDecls();
ObjCInterfaceDecl **ForwardDecls = ClassDecl->getForwardDecls();
// 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 (int i = 0; i < numDecls; i++) {
ObjCInterfaceDecl *ForwardDecl = ForwardDecls[i];
typedefString += "#ifndef _REWRITER_typedef_";
typedefString += ForwardDecl->getName();
typedefString += "\n";
typedefString += "#define _REWRITER_typedef_";
typedefString += ForwardDecl->getName();
typedefString += "\n";
typedefString += "typedef struct objc_object ";
typedefString += ForwardDecl->getName();
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->getLineNumber(LocEnd) > SM->getLineNumber(LocStart)) {
InsertText(LocStart, "/* ", 3);
ReplaceText(LocEnd, 1, ";*/ ", 4);
} else {
InsertText(LocStart, "// ", 3);
}
}
void RewriteObjC::RewriteProperties(unsigned nProperties, ObjCPropertyDecl **Properties)
{
for (unsigned i = 0; i < nProperties; i++) {
ObjCPropertyDecl *Property = Properties[i];
SourceLocation Loc = Property->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) {
ResultStr += "\nstatic ";
if (OMD->getResultType()->isObjCQualifiedIdType())
ResultStr += "id";
else
ResultStr += OMD->getResultType().getAsString();
ResultStr += " ";
// Unique method name
std::string NameStr;
if (OMD->isInstance())
NameStr += "_I_";
else
NameStr += "_C_";
NameStr += OMD->getClassInterface()->getName();
NameStr += "_";
NamedDecl *MethodContext = OMD->getMethodContext();
if (ObjCCategoryImplDecl *CID =
dyn_cast<ObjCCategoryImplDecl>(MethodContext)) {
NameStr += CID->getName();
NameStr += "_";
}
// Append selector names, replacing ':' with '_'
if (OMD->getSelector().getName().find(':') == std::string::npos)
NameStr += OMD->getSelector().getName();
else {
std::string selString = OMD->getSelector().getName();
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->isInstance()) {
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()->getName();
ResultStr += " *";
}
else
ResultStr += Context->getObjCIdType().getAsString();
ResultStr += " self, ";
ResultStr += Context->getObjCSelType().getAsString();
ResultStr += " _cmd";
// Method arguments.
for (unsigned i = 0; i < OMD->getNumParams(); i++) {
ParmVarDecl *PDecl = OMD->getParamDecl(i);
ResultStr += ", ";
if (PDecl->getType()->isObjCQualifiedIdType()) {
ResultStr += "id ";
ResultStr += PDecl->getName();
} else {
std::string Name = PDecl->getName();
PDecl->getType().getAsStringInternal(Name);
ResultStr += Name;
}
}
if (OMD->isVariadic())
ResultStr += ", ...";
ResultStr += ") ";
}
void RewriteObjC::RewriteImplementationDecl(NamedDecl *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());
}
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->getName();
ResultStr += "\n";
ResultStr += "#define _REWRITER_typedef_";
ResultStr += ClassDecl->getName();
ResultStr += "\n";
ResultStr += "typedef struct objc_object ";
ResultStr += ClassDecl->getName();
ResultStr += ";\n#endif\n";
// Mark this typedef as having been generated.
ObjCForwardDecls.insert(ClassDecl);
}
SynthesizeObjCInternalStruct(ClassDecl, ResultStr);
RewriteProperties(ClassDecl->getNumPropertyDecl(),
ClassDecl->getPropertyDecl());
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::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
ObjCIvarDecl *D = IV->getDecl();
if (CurMethodDecl) {
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, Decl::Struct, TUDecl,
SourceLocation(), II, 0);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = new CastExpr(castT, IV->getBase(), SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new ParenExpr(SourceLocation(), SourceLocation(), castExpr);
if (IV->isFreeIvar() &&
CurMethodDecl->getClassInterface() == iFaceDecl->getDecl()) {
MemberExpr *ME = new MemberExpr(PE, true, D, IV->getLocation(), D->getType());
ReplaceStmt(IV, ME);
delete IV;
return ME;
} else {
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, Decl::Struct, TUDecl,
SourceLocation(), II, 0);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = new CastExpr(castT, IV->getBase(), SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new ParenExpr(SourceLocation(), SourceLocation(), 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;
}
//===----------------------------------------------------------------------===//
// Function Body / Expression rewriting
//===----------------------------------------------------------------------===//
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);
}
SourceLocation OrigStmtEnd = S->getLocEnd();
// Start by rewriting 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;
}
// Handle specific things.
if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
return RewriteAtEncode(AtEncode);
if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S))
return RewriteObjCIvarRefExpr(IvarRefExpr);
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)) {
// 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());
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, OrigStmtEnd);
if (BreakStmt *StmtBreakStmt =
dyn_cast<BreakStmt>(S))
return RewriteBreakStmt(StmtBreakStmt);
if (ContinueStmt *StmtContinueStmt =
dyn_cast<ContinueStmt>(S))
return RewriteContinueStmt(StmtContinueStmt);
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();
}
#if 0
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
CastExpr *Replacement = new CastExpr(ICE->getType(), ICE->getSubExpr(), SourceLocation());
// Get the new text.
std::ostringstream Buf;
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;
}
/// 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;
QualType ElementType = cast<ValueDecl>(DS->getDecl())->getType();
elementTypeAsString = ElementType.getAsString();
buf += elementTypeAsString;
buf += " ";
elementName = DS->getDecl()->getName();
buf += elementName;
buf += ";\n\t";
}
else {
DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
elementName = DR->getDecl()->getName();
elementTypeAsString = 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 += " = nil;\n\t";
buf += "__break_label_";
buf += utostr(ObjCBcLabelNo.back());
buf += ": ;\n\t";
buf += "}\n\t";
buf += "else\n\t\t";
buf += elementName;
buf += " = nil;\n";
buf += "}\n";
// Insert all these *after* the statement body.
SourceLocation endBodyLoc = OrigEnd.getFileLocWithOffset(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";
ReplaceText(startLoc, 13, buf.c_str(), buf.size());
SourceLocation endLoc = S->getSynchExpr()->getLocEnd();
const char *endBuf = SM->getCharacterData(endLoc);
endBuf++;
const char *rparenBuf = strchr(endBuf, ')');
SourceLocation rparenLoc = startLoc.getFileLocWithOffset(rparenBuf-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 @try block");
SourceLocation lastCurlyLoc = startLoc;
buf = "}\nelse {\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
// FIXME: This must be objc_sync_exit(syncExpr);
buf += " objc_sync_exit();\n";
buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
buf += "}\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf.c_str(), buf.size());
return 0;
}
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;
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());
bool sawIdTypedCatch = false;
Stmt *lastCatchBody = 0;
ObjCAtCatchStmt *catchList = S->getCatchStmts();
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->getDecl())->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()->getName();
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");
bodyLoc = bodyLoc.getFileLocWithOffset(1);
buf = " } } /* @catch end */\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 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";
ReplaceText(startLoc, 6, 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,
EncodingRecordTypes);
Expr *Replacement = new StringLiteral(StrEncoding.c_str(),
StrEncoding.length(), false, StrType,
SourceLocation(), SourceLocation());
ReplaceStmt(Exp, Replacement);
// Replace this subexpr in the parent.
delete Exp;
return Replacement;
}
Stmt *RewriteObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
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(new StringLiteral(Exp->getSelector().getName().c_str(),
Exp->getSelector().getName().size(),
false, argType, SourceLocation(),
SourceLocation()));
CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
&SelExprs[0], SelExprs.size());
ReplaceStmt(Exp, SelExp);
delete Exp;
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 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 ImplicitCastExpr(pToFunc, DRE);
const FunctionType *FT = msgSendType->getAsFunctionType();
return new CallExpr(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 == Context->getObjCIdType())
return true;
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(Decl *Dcl) {
SourceLocation Loc;
QualType Type;
const FunctionTypeProto *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<FunctionTypeProto>(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 != 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 {
while (*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*/);
SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SelGetUidIdent, getFuncType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
GetProtocolFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SelGetProtoIdent, getFuncType,
FunctionDecl::Extern, false, 0);
}
void RewriteObjC::RewriteFunctionDecl(FunctionDecl *FD) {
// declared in <objc/objc.h>
if (strcmp(FD->getName(), "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("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);
SuperContructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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, Decl::Struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"), 0);
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*/);
MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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, Decl::Struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"), 0);
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*/);
MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
msgSendIdent, msgSendType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
getClassIdent, getClassType,
FunctionDecl::Extern, false, 0);
}
// 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*/);
GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
getClassIdent, getClassType,
FunctionDecl::Extern, false, 0);
}
Stmt *RewriteObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
QualType strType = getConstantStringStructType();
std::string S = "__NSConstantStringImpl_";
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::ostringstream prettyBuf;
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, NULL);
DeclRefExpr *DRE = new DeclRefExpr(NewVD, strType, SourceLocation());
Expr *Unop = new UnaryOperator(DRE, UnaryOperator::AddrOf,
Context->getPointerType(DRE->getType()),
SourceLocation());
// cast to NSConstantString *
CastExpr *cast = new CastExpr(Exp->getType(), Unop, SourceLocation());
ReplaceStmt(Exp, cast);
delete Exp;
return cast;
}
ObjCInterfaceDecl *RewriteObjC::isSuperReceiver(Expr *recExpr) {
// check if we are sending a message to 'super'
if (!CurMethodDecl || !CurMethodDecl->isInstance()) return 0;
CastExpr *CE = dyn_cast<CastExpr>(recExpr);
if (!CE) return 0;
DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CE->getSubExpr());
if (!DRE) return 0;
ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl());
if (!PVD) return 0;
if (strcmp(PVD->getName(), "self") != 0)
return 0;
// is this id<P1..> type?
if (CE->getType()->isObjCQualifiedIdType())
return 0;
const PointerType *PT = CE->getType()->getAsPointerType();
if (!PT) return 0;
ObjCInterfaceType *IT = dyn_cast<ObjCInterfaceType>(PT->getPointeeType());
if (!IT) return 0;
if (IT->getDecl() != CurMethodDecl->getClassInterface()->getSuperClass())
return 0;
return IT->getDecl();
}
// struct objc_super { struct objc_object *receiver; struct objc_class *super; };
QualType RewriteObjC::getSuperStructType() {
if (!SuperStructDecl) {
SuperStructDecl = RecordDecl::Create(*Context, Decl::Struct, TUDecl,
SourceLocation(),
&Context->Idents.get("objc_super"), 0);
QualType FieldTypes[2];
// struct objc_object *receiver;
FieldTypes[0] = Context->getObjCIdType();
// struct objc_class *super;
FieldTypes[1] = Context->getObjCClassType();
// Create fields
FieldDecl *FieldDecls[2];
for (unsigned i = 0; i < 2; ++i)
FieldDecls[i] = FieldDecl::Create(*Context, SourceLocation(), 0,
FieldTypes[i]);
SuperStructDecl->defineBody(FieldDecls, 4);
}
return Context->getTagDeclType(SuperStructDecl);
}
QualType RewriteObjC::getConstantStringStructType() {
if (!ConstantStringDecl) {
ConstantStringDecl = RecordDecl::Create(*Context, Decl::Struct, TUDecl,
SourceLocation(),
&Context->Idents.get("__NSConstantStringImpl"), 0);
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
FieldDecl *FieldDecls[4];
for (unsigned i = 0; i < 4; ++i)
FieldDecls[i] = FieldDecl::Create(*Context, SourceLocation(), 0,
FieldTypes[i]);
ConstantStringDecl->defineBody(FieldDecls, 4);
}
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 *mDecl = Exp->getMethodDecl()) {
QualType resultType = mDecl->getResultType();
if (resultType.getCanonicalType()->isStructureType()
|| resultType.getCanonicalType()->isUnionType())
MsgSendStretFlavor = MsgSendStretFunctionDecl;
else if (resultType.getCanonicalType()->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.
if (!strcmp(clsName->getName(), "super")) {
MsgSendFlavor = MsgSendSuperFunctionDecl;
if (MsgSendStretFlavor)
MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
ObjCInterfaceDecl *SuperDecl =
CurMethodDecl->getClassInterface()->getSuperClass();
llvm::SmallVector<Expr*, 4> InitExprs;
// set the receiver to self, the first argument to all methods.
InitExprs.push_back(new DeclRefExpr(CurMethodDecl->getSelfDecl(),
Context->getObjCIdType(),
SourceLocation()));
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(new StringLiteral(SuperDecl->getIdentifier()->getName(),
SuperDecl->getIdentifier()->getLength(),
false, argType, SourceLocation(),
SourceLocation()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size());
// To turn off a warning, type-cast to 'id'
InitExprs.push_back(
new CastExpr(Context->getObjCIdType(),
Cls, SourceLocation())); // set 'super class', using objc_getClass().
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.Microsoft) {
SynthSuperContructorFunctionDecl();
// Simulate a contructor call...
DeclRefExpr *DRE = new DeclRefExpr(SuperContructorFunctionDecl,
superType, SourceLocation());
SuperRep = new CallExpr(DRE, &InitExprs[0], InitExprs.size(),
superType, SourceLocation());
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE = new InitListExpr(SourceLocation(),
&InitExprs[0], InitExprs.size(),
SourceLocation());
SuperRep = new CompoundLiteralExpr(SourceLocation(), superType, ILE, false);
}
// struct objc_super *
Expr *Unop = new UnaryOperator(SuperRep, UnaryOperator::AddrOf,
Context->getPointerType(SuperRep->getType()),
SourceLocation());
MsgExprs.push_back(Unop);
} else {
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(new StringLiteral(clsName->getName(),
clsName->getLength(),
false, argType, SourceLocation(),
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 CastExpr(Context->getObjCIdType(),
recExpr, SourceLocation())); // set the 'receiver'.
llvm::SmallVector<Expr*, 8> ClsExprs;
QualType argType = Context->getPointerType(Context->CharTy);
ClsExprs.push_back(new StringLiteral(SuperDecl->getIdentifier()->getName(),
SuperDecl->getIdentifier()->getLength(),
false, argType, SourceLocation(),
SourceLocation()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size());
// To turn off a warning, type-cast to 'id'
InitExprs.push_back(
new CastExpr(Context->getObjCIdType(),
Cls, SourceLocation())); // set 'super class', using objc_getClass().
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.Microsoft) {
SynthSuperContructorFunctionDecl();
// Simulate a contructor call...
DeclRefExpr *DRE = new DeclRefExpr(SuperContructorFunctionDecl,
superType, SourceLocation());
SuperRep = new CallExpr(DRE, &InitExprs[0], InitExprs.size(),
superType, SourceLocation());
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE = new InitListExpr(SourceLocation(),
&InitExprs[0], InitExprs.size(),
SourceLocation());
SuperRep = new CompoundLiteralExpr(SourceLocation(), superType, ILE, false);
}
// struct objc_super *
Expr *Unop = new UnaryOperator(SuperRep, UnaryOperator::AddrOf,
Context->getPointerType(SuperRep->getType()),
SourceLocation());
MsgExprs.push_back(Unop);
} else {
// Remove all type-casts because it may contain objc-style types; e.g.
// Foo<Proto> *.
while (CastExpr *CE = dyn_cast<CastExpr>(recExpr))
recExpr = CE->getSubExpr();
recExpr = new CastExpr(Context->getObjCIdType(), recExpr, 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(new StringLiteral(Exp->getSelector().getName().c_str(),
Exp->getSelector().getName().size(),
false, argType, SourceLocation(),
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.
userExpr = new CastExpr(ICE->getType()->isObjCQualifiedIdType()
? Context->getObjCIdType()
: ICE->getType(), userExpr, SourceLocation());
}
// Make id<P...> cast into an 'id' cast.
else if (CastExpr *CE = dyn_cast<CastExpr>(userExpr)) {
if (CE->getType()->isObjCQualifiedIdType()) {
while ((CE = dyn_cast<CastExpr>(userExpr)))
userExpr = CE->getSubExpr();
userExpr = new CastExpr(Context->getObjCIdType(),
userExpr, 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 *mDecl = Exp->getMethodDecl()) {
// Push any user argument types.
for (unsigned i = 0; i < mDecl->getNumParams(); i++) {
QualType t = mDecl->getParamDecl(i)->getType()->isObjCQualifiedIdType()
? Context->getObjCIdType()
: mDecl->getParamDecl(i)->getType();
ArgTypes.push_back(t);
}
returnType = mDecl->getResultType()->isObjCQualifiedIdType()
? Context->getObjCIdType() : mDecl->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 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 CastExpr(Context->getPointerType(Context->VoidTy), DRE,
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);
castType = Context->getPointerType(castType);
cast = new CastExpr(castType, cast, SourceLocation());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new ParenExpr(SourceLocation(), SourceLocation(), cast);
const FunctionType *FT = msgSendType->getAsFunctionType();
CallExpr *CE = new CallExpr(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 DeclRefExpr(MsgSendStretFlavor, msgSendType,
SourceLocation());
// Need to cast objc_msgSend_stret to "void *" (see above comment).
cast = new CastExpr(Context->getPointerType(Context->VoidTy), STDRE,
SourceLocation());
// Now do the "normal" pointer to function cast.
castType = Context->getFunctionType(returnType,
&ArgTypes[0], ArgTypes.size(),
Exp->getMethodDecl() ? Exp->getMethodDecl()->isVariadic() : false);
castType = Context->getPointerType(castType);
cast = new CastExpr(castType, cast, SourceLocation());
// Don't forget the parens to enforce the proper binding.
PE = new ParenExpr(SourceLocation(), SourceLocation(), cast);
FT = msgSendType->getAsFunctionType();
CallExpr *STCE = new CallExpr(PE, &MsgExprs[0], MsgExprs.size(),
FT->getResultType(), SourceLocation());
// Build sizeof(returnType)
SizeOfAlignOfTypeExpr *sizeofExpr = new SizeOfAlignOfTypeExpr(true,
returnType, 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 IntegerLiteral(llvm::APInt(IntSize, 8),
Context->IntTy,
SourceLocation());
BinaryOperator *lessThanExpr = new BinaryOperator(sizeofExpr, limit,
BinaryOperator::LE,
Context->IntTy,
SourceLocation());
// (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
ConditionalOperator *CondExpr =
new ConditionalOperator(lessThanExpr, CE, STCE, returnType);
ReplacingStmt = new ParenExpr(SourceLocation(), SourceLocation(), CondExpr);
}
return ReplacingStmt;
}
Stmt *RewriteObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
Stmt *ReplacingStmt = SynthMessageExpr(Exp);
// Now do the actual rewrite.
ReplaceStmt(Exp, ReplacingStmt);
delete Exp;
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(new StringLiteral(Exp->getProtocol()->getName(),
strlen(Exp->getProtocol()->getName()),
false, argType, SourceLocation(),
SourceLocation()));
CallExpr *ProtoExp = SynthesizeCallToFunctionDecl(GetProtocolFunctionDecl,
&ProtoExprs[0],
ProtoExprs.size());
ReplaceStmt(Exp, ProtoExp);
delete Exp;
return ProtoExp;
}
/// 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->getName() && "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->getName();
if (LangOpts.Microsoft)
Result += "_IMPL";
if (NumIvars > 0) {
const char *cursor = strchr(startBuf, '{');
assert((cursor && endBuf)
&& "SynthesizeObjCInternalStruct - malformed @interface");
// 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->getName();
Result += "_IMPL ";
Result += RCDecl->getName();
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);
}
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->getName();
Result += "_IMPL ";
Result += RCDecl->getName();
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().getName().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().getName().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(ObjCProtocolDecl **Protocols,
int NumProtocols,
const char *prefix,
const char *ClassName,
std::string &Result) {
static bool objc_protocol_methods = false;
if (NumProtocols > 0) {
for (int i = 0; i < NumProtocols; 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 = PDecl->getNumInstanceMethods();
/* 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->getName();
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().getName().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.
int NumMethods = PDecl->getNumClassMethods();
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->getName();
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().getName().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->getName();
Result += " __attribute__ ((used, section (\"__OBJC, __protocol\")))= "
"{\n\t0, \"";
Result += PDecl->getName();
Result += "\", 0, ";
if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
Result += PDecl->getName();
Result += ", ";
}
else
Result += "0, ";
if (PDecl->getNumClassMethods() > 0) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_CLASS_METHODS_";
Result += PDecl->getName();
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(NumProtocols);
Result += "];\n} _OBJC_";
Result += prefix;
Result += "_PROTOCOLS_";
Result += ClassName;
Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
"{\n\t0, ";
Result += utostr(NumProtocols);
Result += "\n";
Result += "\t,{&_OBJC_PROTOCOL_";
Result += Protocols[0]->getName();
Result += " \n";
for (int i = 1; i < NumProtocols; i++) {
ObjCProtocolDecl *PDecl = Protocols[i];
Result += "\t ,&_OBJC_PROTOCOL_";
Result += PDecl->getName();
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->getName();
FullCategoryName += '_';
FullCategoryName += IDecl->getName();
// 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(),
CDecl->getNumReferencedProtocols(),
"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->getName();
Result += "\"\n\t, \"";
Result += ClassDecl->getName();
Result += "\"\n";
if (IDecl->getNumInstanceMethods() > 0) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_INSTANCE_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (IDecl->getNumClassMethods() > 0) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_CLASS_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (CDecl && CDecl->getNumReferencedProtocols() > 0) {
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) {
Result += "__OFFSETOFIVAR__(struct ";
Result += IDecl->getName();
if (LangOpts.Microsoft)
Result += "_IMPL";
Result += ", ";
Result += ivar->getName();
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->getName();
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)->getName();
Result += "\", \"";
std::string StrEncoding;
Context->getObjCEncodingForType((*IVI)->getType(), StrEncoding,
EncodingRecordTypes);
Result += StrEncoding;
Result += "\", ";
SynthesizeIvarOffsetComputation(IDecl, *IVI, Result);
Result += "}\n";
for (++IVI; IVI != IVE; ++IVI) {
Result += "\t ,{\"";
Result += (*IVI)->getName();
Result += "\", \"";
std::string StrEncoding;
Context->getObjCEncodingForType((*IVI)->getType(), StrEncoding,
EncodingRecordTypes);
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->getName(), Result);
// Build _objc_method_list for class's class methods if needed
RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
false, "", IDecl->getName(), Result);
// Protocols referenced in class declaration?
RewriteObjCProtocolsMetaData(CDecl->getReferencedProtocols(),
CDecl->getNumIntfRefProtocols(),
"CLASS", CDecl->getName(), 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->getName();
Result += " __attribute__ ((used, section (\"__OBJC, __meta_class\")))= "
"{\n\t(struct _objc_class *)\"";
Result += (RootClass ? RootClass->getName() : CDecl->getName());
Result += "\"";
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getName();
Result += "\", \"";
Result += CDecl->getName();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getName();
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->getNumClassMethods() > 0) {
Result += "\n\t, (struct _objc_method_list *)&_OBJC_CLASS_METHODS_";
Result += IDecl->getName();
Result += "\n";
}
else
Result += ", 0\n";
if (CDecl->getNumIntfRefProtocols() > 0) {
Result += "\t,0, (struct _objc_protocol_list *)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getName();
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->getName();
Result += " __attribute__ ((used, section (\"__OBJC, __class\")))= "
"{\n\t&_OBJC_METACLASS_";
Result += CDecl->getName();
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getName();
Result += "\", \"";
Result += CDecl->getName();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getName();
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->getName();
if (LangOpts.Microsoft)
Result += "_IMPL";
Result += ")";
}
if (NumIvars > 0) {
Result += ", (struct _objc_ivar_list *)&_OBJC_INSTANCE_VARIABLES_";
Result += CDecl->getName();
Result += "\n\t";
}
else
Result += ",0";
if (IDecl->getNumInstanceMethods() > 0) {
Result += ", (struct _objc_method_list *)&_OBJC_INSTANCE_METHODS_";
Result += CDecl->getName();
Result += ", 0\n\t";
}
else
Result += ",0,0";
if (CDecl->getNumIntfRefProtocols() > 0) {
Result += ", (struct _objc_protocol_list*)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getName();
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(std::string &Result) {
int ClsDefCount = ClassImplementation.size();
int CatDefCount = CategoryImplementation.size();
if (ClsDefCount == 0 && CatDefCount == 0)
return;
// Rewrite implemented methods
for (int i = 0; i < ClsDefCount; i++)
RewriteImplementationDecl(ClassImplementation[i]);
for (int i = 0; i < CatDefCount; i++)
RewriteImplementationDecl(CategoryImplementation[i]);
// This is needed for determining instance variable offsets.
Result += "#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]->getName();
Result += "\n";
}
for (int i = 0; i < CatDefCount; i++) {
Result += "\t,&_OBJC_CATEGORY_";
Result += CategoryImplementation[i]->getClassInterface()->getName();
Result += "_";
Result += CategoryImplementation[i]->getName();
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";
}
}
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