Add basic support for adding !tbaa.struct metadata on llvm.memcpy calls for
struct assignment.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164853 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenTBAA.h b/lib/CodeGen/CodeGenTBAA.h
index c17a5cf..eedb996 100644
--- a/lib/CodeGen/CodeGenTBAA.h
+++ b/lib/CodeGen/CodeGenTBAA.h
@@ -49,6 +49,10 @@
/// MetadataCache - This maps clang::Types to llvm::MDNodes describing them.
llvm::DenseMap<const Type *, llvm::MDNode *> MetadataCache;
+ /// StructMetadataCache - This maps clang::Types to llvm::MDNodes describing
+ /// them for struct assignments.
+ llvm::DenseMap<const Type *, llvm::MDNode *> StructMetadataCache;
+
llvm::MDNode *Root;
llvm::MDNode *Char;
@@ -60,6 +64,13 @@
/// considered to be equivalent to it.
llvm::MDNode *getChar();
+ /// CollectFields - Collect information about the fields of a type for
+ /// !tbaa.struct metadata formation. Return false for an unsupported type.
+ bool CollectFields(uint64_t BaseOffset,
+ QualType Ty,
+ SmallVectorImpl<llvm::MDBuilder::TBAAStructField> &Fields,
+ bool MayAlias);
+
public:
CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext &VMContext,
const CodeGenOptions &CGO,
@@ -74,6 +85,10 @@
/// getTBAAInfoForVTablePtr - Get the TBAA MDNode to be used for a
/// dereference of a vtable pointer.
llvm::MDNode *getTBAAInfoForVTablePtr();
+
+ /// getTBAAStructInfo - Get the TBAAStruct MDNode to be used for a memcpy of
+ /// the given type.
+ llvm::MDNode *getTBAAStructInfo(QualType QTy);
};
} // end namespace CodeGen