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DI: Use Metadata for DITypeRef and DIScopeRef
Now that `MDString` and `MDNode` have a common base class, use it. Note that it's not useful to assume subclasses of `Metadata` must be one or the other since we'll be adding more subclasses soon enough. Part of PR21532. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222064 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -39,6 +39,7 @@ class Value;
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class DbgDeclareInst;
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class DbgValueInst;
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class Instruction;
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class Metadata;
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class MDNode;
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class MDString;
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class NamedMDNode;
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@ -333,13 +334,13 @@ template <typename T> class DIRef {
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/// \brief Val can be either a MDNode or a MDString.
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///
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/// In the latter, MDString specifies the type identifier.
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const Value *Val;
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explicit DIRef(const Value *V);
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const Metadata *Val;
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explicit DIRef(const Metadata *V);
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public:
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T resolve(const DITypeIdentifierMap &Map) const;
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StringRef getName() const;
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operator Value *() const { return const_cast<Value *>(Val); }
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operator Metadata *() const { return const_cast<Metadata *>(Val); }
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};
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template <typename T>
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@ -373,12 +374,12 @@ template <typename T> StringRef DIRef<T>::getName() const {
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/// \brief Handle fields that are references to DIScopes.
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template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
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/// \brief Specialize DIRef constructor for DIScopeRef.
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template <> DIRef<DIScope>::DIRef(const Value *V);
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template <> DIRef<DIScope>::DIRef(const Metadata *V);
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/// \brief Handle fields that are references to DITypes.
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template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
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/// \brief Specialize DIRef constructor for DITypeRef.
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template <> DIRef<DIType>::DIRef(const Value *V);
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template <> DIRef<DIType>::DIRef(const Metadata *V);
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/// \briefThis is a wrapper for a type.
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///
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@ -411,31 +411,33 @@ static bool fieldIsMDString(const MDNode *DbgNode, unsigned Elt) {
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}
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/// \brief Check if a value can be a reference to a type.
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static bool isTypeRef(const Value *Val) {
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return !Val ||
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(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
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(isa<MDNode>(Val) && DIType(cast<MDNode>(Val)).isType());
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static bool isTypeRef(const Metadata *MD) {
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if (!MD)
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return true;
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if (auto *S = dyn_cast<MDString>(MD))
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return !S->getString().empty();
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if (auto *N = dyn_cast<MDNode>(MD))
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return DIType(N).isType();
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return false;
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}
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/// \brief Check if referenced field might be a type.
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static bool fieldIsTypeRef(const MDNode *DbgNode, unsigned Elt) {
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Value *Fld = getField(DbgNode, Elt);
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return isTypeRef(Fld);
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return isTypeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
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}
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/// \brief Check if a value can be a ScopeRef.
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static bool isScopeRef(const Value *Val) {
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return !Val ||
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(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
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// Not checking for Val->isScope() here, because it would work
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// only for lexical scopes and not all subclasses of DIScope.
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isa<MDNode>(Val);
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static bool isScopeRef(const Metadata *MD) {
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if (!MD)
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return true;
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if (auto *S = dyn_cast<MDString>(MD))
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return !S->getString().empty();
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return isa<MDNode>(MD);
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}
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/// \brief Check if a field at position Elt of a MDNode can be a ScopeRef.
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static bool fieldIsScopeRef(const MDNode *DbgNode, unsigned Elt) {
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Value *Fld = getField(DbgNode, Elt);
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return isScopeRef(Fld);
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return isScopeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
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}
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bool DIType::Verify() const {
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@ -1465,19 +1467,19 @@ void DIVariable::printExtendedName(raw_ostream &OS) const {
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}
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}
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template <> DIRef<DIScope>::DIRef(const Value *V) : Val(V) {
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template <> DIRef<DIScope>::DIRef(const Metadata *V) : Val(V) {
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assert(isScopeRef(V) && "DIScopeRef should be a MDString or MDNode");
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}
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template <> DIRef<DIType>::DIRef(const Value *V) : Val(V) {
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template <> DIRef<DIType>::DIRef(const Metadata *V) : Val(V) {
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assert(isTypeRef(V) && "DITypeRef should be a MDString or MDNode");
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}
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template <>
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DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const {
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return DIScopeRef(getField(DbgNode, Elt));
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return DIScopeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
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}
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template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const {
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return DITypeRef(getField(DbgNode, Elt));
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return DITypeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
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}
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bool llvm::StripDebugInfo(Module &M) {
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