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Obj-C non fragile ABI: Add GetInterfaceEHType for getting the Obj-C 

exception typeinfo metadata, and a few other EH related types/functions.
 - No functionality change.

llvm-svn: 65761
This commit is contained in:
Daniel Dunbar 2009-03-01 04:46:24 +00:00
parent c6928bbe29
commit b1559a4499
1 changed files with 73 additions and 3 deletions
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76
clang/lib/CodeGen/CGObjCMac.cpp
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@ -297,7 +297,10 @@ public:
/// exception personality function.
llvm::Value *EHPersonalityPtr;
llvm::Function *UnwindResumeOrRethrowFn;
llvm::Function *UnwindResumeOrRethrowFn, *ObjCBeginCatchFn, *ObjCEndCatchFn;
const llvm::StructType *EHTypeTy;
const llvm::Type *EHTypePtrTy;
ObjCNonFragileABITypesHelper(CodeGen::CodeGenModule &cgm);
~ObjCNonFragileABITypesHelper(){}
@ -613,7 +616,10 @@ private:
llvm::GlobalVariable* ObjCEmptyVtableVar;
/// MetaClassReferences - uniqued meta class references.
llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> MetaClassReferences;
/// EHTypeReferences - uniqued class ehtype references.
llvm::DenseMap<IdentifierInfo*, llvm::GlobalVariable*> EHTypeReferences;
/// FinishNonFragileABIModule - Write out global data structures at the end of
/// processing a translation unit.
void FinishNonFragileABIModule();
@ -698,7 +704,11 @@ private:
/// EmitSelector - Return a Value*, of type ObjCTypes.SelectorPtrTy,
/// for the given selector.
llvm::Value *EmitSelector(CGBuilderTy &Builder, Selector Sel);
/// GetInterfaceEHType - Get the ehtype for the given Objective-C
/// interface. The return value has type EHTypePtrTy.
llvm::Value *GetInterfaceEHType(const ObjCInterfaceType *IT);
public:
CGObjCNonFragileABIMac(CodeGen::CodeGenModule &cgm);
// FIXME. All stubs for now!
@ -3373,6 +3383,7 @@ ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModul
"__objc_personality_v0");
EHPersonalityPtr = llvm::ConstantExpr::getBitCast(Personality, Int8PtrTy);
Params.clear();
Params.push_back(Int8PtrTy);
UnwindResumeOrRethrowFn =
@ -3380,6 +3391,30 @@ ObjCNonFragileABITypesHelper::ObjCNonFragileABITypesHelper(CodeGen::CodeGenModul
Params,
false),
"_Unwind_Resume_or_Rethrow");
ObjCBeginCatchFn =
CGM.CreateRuntimeFunction(llvm::FunctionType::get(Int8PtrTy,
Params,
false),
"objc_begin_catch");
Params.clear();
ObjCEndCatchFn =
CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::VoidTy,
Params,
false),
"objc_end_catch");
// struct objc_typeinfo {
// const void** vtable; // objc_ehtype_vtable + 2
// const char* name; // c++ typeinfo string
// Class cls;
// };
EHTypeTy = llvm::StructType::get(llvm::PointerType::getUnqual(Int8PtrTy),
Int8PtrTy,
ClassnfABIPtrTy,
NULL);
CGM.getModule().addTypeName("struct._objc_typeinfo", CategorynfABITy);
EHTypePtrTy = llvm::PointerType::getUnqual(EHTypeTy);
}
llvm::Function *CGObjCNonFragileABIMac::ModuleInitFunction() {
@ -4830,6 +4865,41 @@ void CGObjCNonFragileABIMac::EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
// Clear the insertion point to indicate we are in unreachable code.
CGF.Builder.ClearInsertionPoint();
}
llvm::Value *
CGObjCNonFragileABIMac::GetInterfaceEHType(const ObjCInterfaceType *IT) {
const ObjCInterfaceDecl *ID = IT->getDecl();
llvm::GlobalVariable * &Entry = EHTypeReferences[ID->getIdentifier()];
if (Entry)
return Entry;
std::string ClassName("\01_OBJC_CLASS_$_" + ID->getNameAsString());
std::string VTableName = "objc_ehtype_vtable";
llvm::GlobalVariable *VTableGV =
CGM.getModule().getGlobalVariable(VTableName);
if (!VTableGV)
VTableGV = new llvm::GlobalVariable(ObjCTypes.Int8PtrTy, false,
llvm::GlobalValue::ExternalLinkage,
0, VTableName, &CGM.getModule());
llvm::Value *VTableIdx = llvm::ConstantInt::get(llvm::Type::Int32Ty, 2);
std::vector<llvm::Constant*> Values(3);
Values[0] = llvm::ConstantExpr::getGetElementPtr(VTableGV, &VTableIdx, 1);
Values[1] = GetClassName(ID->getIdentifier());
Values[2] = GetClassGlobal(ClassName);
llvm::Constant *Init = llvm::ConstantStruct::get(ObjCTypes.EHTypeTy, Values);
Entry =
new llvm::GlobalVariable(ObjCTypes.EHTypeTy, false,
llvm::GlobalValue::WeakLinkage,
Init,
(std::string("OBJC_EHTYPE_$_") +
ID->getIdentifier()->getName()),
&CGM.getModule());
return Entry;
}
/* *** */