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Build up more of the rtti info for a class. WIP. 

llvm-svn: 88795
This commit is contained in:
Mike Stump 2009-11-14 15:55:18 +00:00
parent 4197054ece
commit 1acec6a41a
1 changed files with 50 additions and 27 deletions
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45
clang/lib/CodeGen/CGRtti.cpp
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@ -24,6 +24,25 @@ public:
: CGM(cgm), VMContext(cgm.getModule().getContext()),
Int8PtrTy(llvm::Type::getInt8PtrTy(VMContext)) { }
llvm::Constant *Buildclass_type_infoDesc() {
// Build a descriptor for class_type_info.
llvm::StringRef Name = "_ZTVN10__cxxabiv121__vmi_class_type_infoE";
llvm::Constant *GV = CGM.getModule().getGlobalVariable(Name);
if (GV)
GV = llvm::ConstantExpr::getBitCast(GV,
llvm::PointerType::get(Int8PtrTy, 0));
else {
llvm::GlobalVariable::LinkageTypes linktype;
linktype = llvm::GlobalValue::ExternalLinkage;
GV = new llvm::GlobalVariable(CGM.getModule(), Int8PtrTy,
true, linktype, 0, Name);
}
llvm::Constant *C;
C = llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), 2);
C = llvm::ConstantExpr::getInBoundsGetElementPtr(GV, &C, 1);
return llvm::ConstantExpr::getBitCast(C, Int8PtrTy);
}
llvm::Constant *BuildName(const CXXRecordDecl *RD) {
llvm::SmallString<256> OutName;
llvm::raw_svector_ostream Out(OutName);
@ -42,27 +61,24 @@ public:
s = llvm::ConstantExpr::getBitCast(s, Int8PtrTy);
return s;
};
};
llvm::Constant *CodeGenModule::GenerateRtti(const CXXRecordDecl *RD) {
RttiBuilder b(*this);
llvm::Constant *Buildclass_type_info(const CXXRecordDecl *RD) {
const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
if (!getContext().getLangOptions().Rtti)
if (!CGM.getContext().getLangOptions().Rtti)
return llvm::Constant::getNullValue(Int8PtrTy);
llvm::SmallString<256> OutName;
llvm::raw_svector_ostream Out(OutName);
mangleCXXRtti(getMangleContext(), Context.getTagDeclType(RD), Out);
mangleCXXRtti(CGM.getMangleContext(), CGM.getContext().getTagDeclType(RD),
Out);
llvm::GlobalVariable::LinkageTypes linktype;
linktype = llvm::GlobalValue::LinkOnceODRLinkage;
std::vector<llvm::Constant *> info;
// assert(0 && "FIXME: implement rtti descriptor");
// FIXME: descriptor
info.push_back(llvm::Constant::getNullValue(Int8PtrTy));
info.push_back(b.BuildName(RD));
info.push_back(Buildclass_type_infoDesc());
info.push_back(BuildName(RD));
// FIXME: rest of rtti bits
@ -70,8 +86,15 @@ llvm::Constant *CodeGenModule::GenerateRtti(const CXXRecordDecl *RD) {
llvm::ArrayType *type = llvm::ArrayType::get(Int8PtrTy, info.size());
C = llvm::ConstantArray::get(type, info);
llvm::Constant *Rtti =
new llvm::GlobalVariable(getModule(), type, true, linktype, C,
new llvm::GlobalVariable(CGM.getModule(), type, true, linktype, C,
Out.str());
Rtti = llvm::ConstantExpr::getBitCast(Rtti, Int8PtrTy);
return Rtti;
}
};
llvm::Constant *CodeGenModule::GenerateRtti(const CXXRecordDecl *RD) {
RttiBuilder b(*this);
return b.Buildclass_type_info(RD);
}