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Stub out most of the VTT building code. WIP. 

llvm-svn: 86772
This commit is contained in:
Mike Stump 2009-11-11 00:35:07 +00:00
parent 78319c67ca
commit 8b2d2d0707
1 changed files with 83 additions and 2 deletions
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85
clang/lib/CodeGen/CGVtable.cpp
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@ -723,12 +723,93 @@ class VTTBuilder {
/// Class - The most derived class that this vtable is being built for.
const CXXRecordDecl *Class;
CodeGenModule &CGM; // Per-module state.
llvm::SmallSet<const CXXRecordDecl *, 32> SeenVBase;
/// Secondary - Add the secondary vtable pointers to Inits.
void Secondary(const CXXRecordDecl *RD, bool MorallyVirtual=false) {
if (RD->getNumVBases() == 0 && ! MorallyVirtual)
return;
for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
e = RD->bases_end(); i != e; ++i) {
const CXXRecordDecl *Base =
cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
const ASTRecordLayout &Layout = CGM.getContext().getASTRecordLayout(RD);
const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase();
const bool PrimaryBaseWasVirtual = Layout.getPrimaryBaseWasVirtual();
bool NonVirtualPrimaryBase;
NonVirtualPrimaryBase = !PrimaryBaseWasVirtual && Base == PrimaryBase;
bool BaseMorallyVirtual = MorallyVirtual | i->isVirtual();
if ((Base->getNumVBases() || BaseMorallyVirtual)
&& !NonVirtualPrimaryBase) {
// FIXME: Slightly too many of these for __ZTT8test8_B2
// FIXME: ctor vtbl or normal vtable.
llvm::Constant *vtbl = CGM.getVtableInfo().getVtable(Base);
Inits.push_back(vtbl);
}
Secondary(Base, BaseMorallyVirtual);
}
}
/// BuiltVTT - Add the VTT to Inits.
void BuildVTT(const CXXRecordDecl *RD, bool MorallyVirtual=false) {
if (RD->getNumVBases() == 0 && !MorallyVirtual)
return;
// First comes the primary virtual table pointer...
// FIXME: ctor vtable instead
Inits.push_back(CGM.getVtableInfo().getVtable(RD));
// then the secondary VTTs....
SecondaryVTTs(RD, MorallyVirtual);
// and last the secondary vtable pointers.
Secondary(RD, MorallyVirtual);
}
/// SecondaryVTTs - Add the secondary VTTs to Inits. The secondary VTTs are
/// built from each direct non-virtual proper base that requires a VTT in
/// declaration order.
void SecondaryVTTs(const CXXRecordDecl *RD, bool MorallyVirtual=false) {
for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
e = RD->bases_end(); i != e; ++i) {
const CXXRecordDecl *Base =
cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
if (i->isVirtual())
continue;
BuildVTT(Base, MorallyVirtual);
}
}
/// VirtualVTTs - Add the VTT for each proper virtual base in inheritance
/// graph preorder.
void VirtualVTTs(const CXXRecordDecl *RD) {
for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(),
e = RD->bases_end(); i != e; ++i) {
const CXXRecordDecl *Base =
cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl());
if (i->isVirtual() && !SeenVBase.count(Base)) {
SeenVBase.insert(Base);
BuildVTT(Base, true);
}
VirtualVTTs(Base);
}
}
public:
VTTBuilder(std::vector<llvm::Constant *> &inits, const CXXRecordDecl *c,
CodeGenModule &cgm) : Inits(inits), Class(c), CGM(cgm) {
// First comes the primary virtual table pointer for the complete class...
Inits.push_back(CGM.getVtableInfo().getVtable(Class));
// then the secondary VTTs...
SecondaryVTTs(Class);
// then the secondary vtable pointers...
Secondary(Class);
// and last, the virtual VTTs.
VirtualVTTs(Class);
}
};
@ -746,10 +827,10 @@ llvm::Constant *CodeGenModule::GenerateVTT(const CXXRecordDecl *RD) {
std::vector<llvm::Constant *> inits;
llvm::Type *Ptr8Ty=llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext),0);
VTTBuilder b(inits, RD, *this);
D1(printf("vtt %s\n", RD->getNameAsCString()));
VTTBuilder b(inits, RD, *this);
llvm::Constant *C;
llvm::ArrayType *type = llvm::ArrayType::get(Ptr8Ty, inits.size());
C = llvm::ConstantArray::get(type, inits);