Emit vtable info.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@94751 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index d55ddb7..f9a40cb 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -681,6 +681,72 @@
}
}
+/// getOrCreateVTablePtrType - Return debug info descriptor for vtable.
+llvm::DIType CGDebugInfo::getOrCreateVTablePtrType(llvm::DICompileUnit Unit) {
+ if (!VTablePtrType.isNull())
+ return VTablePtrType;
+
+ ASTContext &Context = CGM.getContext();
+
+ /* Function type */
+ llvm::SmallVector<llvm::DIDescriptor, 16> STys;
+ STys.push_back(getOrCreateType(Context.IntTy, Unit));
+ llvm::DIArray SElements =
+ DebugFactory.GetOrCreateArray(STys.data(), STys.size());
+ llvm::DIType SubTy =
+ DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_subroutine_type,
+ Unit, "", llvm::DICompileUnit(),
+ 0, 0, 0, 0, 0, llvm::DIType(), SElements);
+
+ unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
+ llvm::DIType vtbl_ptr_type
+ = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type,
+ Unit, "__vtbl_ptr_type", llvm::DICompileUnit(),
+ 0, Size, 0, 0, 0, SubTy);
+
+ VTablePtrType = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type,
+ Unit, "", llvm::DICompileUnit(),
+ 0, Size, 0, 0, 0, vtbl_ptr_type);
+ return VTablePtrType;
+}
+
+/// getVtableName - Get vtable name for the given Class.
+llvm::StringRef CGDebugInfo::getVtableName(const CXXRecordDecl *Decl) {
+ // Otherwise construct gdb compatible name name.
+ std::string Name = "_vptr$" + Decl->getNameAsString();
+
+ // Copy this name on the side and use its reference.
+ char *StrPtr = FunctionNames.Allocate<char>(Name.length());
+ memcpy(StrPtr, Name.data(), Name.length());
+ return llvm::StringRef(StrPtr, Name.length());
+}
+
+
+/// CollectVtableInfo - If the C++ class has vtable info then insert appropriate
+/// debug info entry in EltTys vector.
+void CGDebugInfo::
+CollectVtableInfo(const CXXRecordDecl *Decl,
+ llvm::DICompileUnit Unit,
+ llvm::SmallVectorImpl<llvm::DIDescriptor> &EltTys) {
+ const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(Decl);
+
+ // If there is a primary base then it will hold vtable info.
+ if (RL.getPrimaryBase())
+ return;
+
+ // If this class is not dynamic then there is not any vtable info to collect.
+ if (!Decl->isDynamicClass())
+ return;
+
+ unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
+ llvm::DIType VPTR
+ = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
+ getVtableName(Decl), llvm::DICompileUnit(),
+ 0, Size, 0, 0, 0,
+ getOrCreateVTablePtrType(Unit));
+ EltTys.push_back(VPTR);
+}
+
/// CreateType - get structure or union type.
llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty,
llvm::DICompileUnit Unit) {
@@ -737,9 +803,12 @@
// Convert all the elements.
llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
+ const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(Decl);
+ if (CXXDecl)
+ CollectVtableInfo(CXXDecl, Unit, EltTys);
CollectRecordFields(Decl, Unit, EltTys);
llvm::MDNode *ContainingType = NULL;
- if (CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(Decl)) {
+ if (CXXDecl) {
CollectCXXMemberFunctions(CXXDecl, Unit, EltTys, FwdDecl);
CollectCXXBases(CXXDecl, Unit, EltTys, FwdDecl);