[cfe-commits] r88795 - /cfe/trunk/lib/CodeGen/CGRtti.cpp
Mike Stump
mrs at apple.com
Sat Nov 14 07:55:18 PST 2009
Author: mrs
Date: Sat Nov 14 09:55:18 2009
New Revision: 88795
URL: http://llvm.org/viewvc/llvm-project?rev=88795&view=rev
Log:
Build up more of the rtti info for a class. WIP.
Modified:
cfe/trunk/lib/CodeGen/CGRtti.cpp
Modified: cfe/trunk/lib/CodeGen/CGRtti.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGRtti.cpp?rev=88795&r1=88794&r2=88795&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGRtti.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGRtti.cpp Sat Nov 14 09:55:18 2009
@@ -24,6 +24,25 @@
: 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);
@@ -42,36 +61,40 @@
s = llvm::ConstantExpr::getBitCast(s, Int8PtrTy);
return s;
};
+
+ llvm::Constant *Buildclass_type_info(const CXXRecordDecl *RD) {
+ const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
+
+ if (!CGM.getContext().getLangOptions().Rtti)
+ return llvm::Constant::getNullValue(Int8PtrTy);
+
+ llvm::SmallString<256> OutName;
+ llvm::raw_svector_ostream Out(OutName);
+ mangleCXXRtti(CGM.getMangleContext(), CGM.getContext().getTagDeclType(RD),
+ Out);
+
+ llvm::GlobalVariable::LinkageTypes linktype;
+ linktype = llvm::GlobalValue::LinkOnceODRLinkage;
+ std::vector<llvm::Constant *> info;
+
+ info.push_back(Buildclass_type_infoDesc());
+ info.push_back(BuildName(RD));
+
+ // FIXME: rest of rtti bits
+
+ llvm::Constant *C;
+ llvm::ArrayType *type = llvm::ArrayType::get(Int8PtrTy, info.size());
+ C = llvm::ConstantArray::get(type, info);
+ llvm::Constant *Rtti =
+ 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);
- const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext);
-
- if (!getContext().getLangOptions().Rtti)
- return llvm::Constant::getNullValue(Int8PtrTy);
-
- llvm::SmallString<256> OutName;
- llvm::raw_svector_ostream Out(OutName);
- mangleCXXRtti(getMangleContext(), Context.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));
-
- // FIXME: rest of rtti bits
-
- llvm::Constant *C;
- 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,
- Out.str());
- Rtti = llvm::ConstantExpr::getBitCast(Rtti, Int8PtrTy);
- return Rtti;
+ return b.Buildclass_type_info(RD);
}
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