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Use MDBuilder to help with metadata creation.

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llvm-svn: 154767
This commit is contained in:
Duncan Sands
2012-04-15 18:04:54 +00:00
parent 62d5f6f247
commit c720e78ebc
5 changed files with 16 additions and 45 deletions
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36
clang/lib/CodeGen/CodeGenTBAA.cpp
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@@ -28,7 +28,7 @@ using namespace CodeGen;
CodeGenTBAA::CodeGenTBAA(ASTContext &Ctx, llvm::LLVMContext& VMContext,
const LangOptions &Features, MangleContext &MContext)
: Context(Ctx), VMContext(VMContext), Features(Features), MContext(MContext),
Root(0), Char(0) {
MDHelper(VMContext), Root(0), Char(0) {
}
CodeGenTBAA::~CodeGenTBAA() {
@@ -40,7 +40,7 @@ llvm::MDNode *CodeGenTBAA::getRoot() {
// (or a different version of this front-end), their TBAA trees will
// remain distinct, and the optimizer will treat them conservatively.
if (!Root)
Root = getTBAAInfoForNamedType("Simple C/C++ TBAA", 0);
Root = MDHelper.CreateTBAARoot("Simple C/C++ TBAA");
return Root;
}
@@ -51,33 +51,11 @@ llvm::MDNode *CodeGenTBAA::getChar() {
// these special powers only cover user-accessible memory, and doesn't
// include things like vtables.
if (!Char)
Char = getTBAAInfoForNamedType("omnipotent char", getRoot());
Char = MDHelper.CreateTBAANode("omnipotent char", getRoot());
return Char;
}
/// getTBAAInfoForNamedType - Create a TBAA tree node with the given string
/// as its identifier, and the given Parent node as its tree parent.
llvm::MDNode *CodeGenTBAA::getTBAAInfoForNamedType(StringRef NameStr,
llvm::MDNode *Parent,
bool Readonly) {
// Currently there is only one flag defined - the readonly flag.
llvm::Value *Flags = 0;
if (Readonly)
Flags = llvm::ConstantInt::get(llvm::Type::getInt64Ty(VMContext), true);
// Set up the mdnode operand list.
llvm::Value *Ops[] = {
llvm::MDString::get(VMContext, NameStr),
Parent,
Flags
};
// Create the mdnode.
unsigned Len = llvm::array_lengthof(Ops) - !Flags;
return llvm::MDNode::get(VMContext, llvm::makeArrayRef(Ops, Len));
}
static bool TypeHasMayAlias(QualType QTy) {
// Tagged types have declarations, and therefore may have attributes.
if (const TagType *TTy = dyn_cast<TagType>(QTy))
@@ -137,7 +115,7 @@ CodeGenTBAA::getTBAAInfo(QualType QTy) {
// "underlying types".
default:
return MetadataCache[Ty] =
getTBAAInfoForNamedType(BTy->getName(Features), getChar());
MDHelper.CreateTBAANode(BTy->getName(Features), getChar());
}
}
@@ -145,7 +123,7 @@ CodeGenTBAA::getTBAAInfo(QualType QTy) {
// TODO: Implement C++'s type "similarity" and consider dis-"similar"
// pointers distinct.
if (Ty->isPointerType())
return MetadataCache[Ty] = getTBAAInfoForNamedType("any pointer",
return MetadataCache[Ty] = MDHelper.CreateTBAANode("any pointer",
getChar());
// Enum types are distinct types. In C++ they have "underlying types",
@@ -173,7 +151,7 @@ CodeGenTBAA::getTBAAInfo(QualType QTy) {
llvm::raw_svector_ostream Out(OutName);
MContext.mangleCXXRTTIName(QualType(ETy, 0), Out);
Out.flush();
return MetadataCache[Ty] = getTBAAInfoForNamedType(OutName, getChar());
return MetadataCache[Ty] = MDHelper.CreateTBAANode(OutName, getChar());
}
// For now, handle any other kind of type conservatively.
@@ -181,5 +159,5 @@ CodeGenTBAA::getTBAAInfo(QualType QTy) {
}
llvm::MDNode *CodeGenTBAA::getTBAAInfoForVTablePtr() {
return getTBAAInfoForNamedType("vtable pointer", getRoot());
return MDHelper.CreateTBAANode("vtable pointer", getRoot());
}