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DI: Use Metadata for DITypeRef and DIScopeRef

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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
This commit is contained in:
Duncan P. N. Exon Smith 2014-11-14 23:55:03 +00:00
parent 0737b4ee14
commit f4d2109d2d
2 changed files with 26 additions and 23 deletions
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11
include/llvm/IR/DebugInfo.h
View File

@ -39,6 +39,7 @@ class Value;
class DbgDeclareInst;
class DbgValueInst;
class Instruction;
class Metadata;
class MDNode;
class MDString;
class NamedMDNode;
@ -333,13 +334,13 @@ template <typename T> class DIRef {
/// \brief Val can be either a MDNode or a MDString.
///
/// In the latter, MDString specifies the type identifier.
const Value *Val;
explicit DIRef(const Value *V);
const Metadata *Val;
explicit DIRef(const Metadata *V);
public:
T resolve(const DITypeIdentifierMap &Map) const;
StringRef getName() const;
operator Value *() const { return const_cast<Value *>(Val); }
operator Metadata *() const { return const_cast<Metadata *>(Val); }
};
template <typename T>
@ -373,12 +374,12 @@ template <typename T> StringRef DIRef<T>::getName() const {
/// \brief Handle fields that are references to DIScopes.
template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
/// \brief Specialize DIRef constructor for DIScopeRef.
template <> DIRef<DIScope>::DIRef(const Value *V);
template <> DIRef<DIScope>::DIRef(const Metadata *V);
/// \brief Handle fields that are references to DITypes.
template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
/// \brief Specialize DIRef constructor for DITypeRef.
template <> DIRef<DIType>::DIRef(const Value *V);
template <> DIRef<DIType>::DIRef(const Metadata *V);
/// \briefThis is a wrapper for a type.
///

38
lib/IR/DebugInfo.cpp
View File

@ -411,31 +411,33 @@ static bool fieldIsMDString(const MDNode *DbgNode, unsigned Elt) {
}
/// \brief Check if a value can be a reference to a type.
static bool isTypeRef(const Value *Val) {
return !Val ||
(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
(isa<MDNode>(Val) && DIType(cast<MDNode>(Val)).isType());
static bool isTypeRef(const Metadata *MD) {
if (!MD)
return true;
if (auto *S = dyn_cast<MDString>(MD))
return !S->getString().empty();
if (auto *N = dyn_cast<MDNode>(MD))
return DIType(N).isType();
return false;
}
/// \brief Check if referenced field might be a type.
static bool fieldIsTypeRef(const MDNode *DbgNode, unsigned Elt) {
Value *Fld = getField(DbgNode, Elt);
return isTypeRef(Fld);
return isTypeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
}
/// \brief Check if a value can be a ScopeRef.
static bool isScopeRef(const Value *Val) {
return !Val ||
(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
// Not checking for Val->isScope() here, because it would work
// only for lexical scopes and not all subclasses of DIScope.
isa<MDNode>(Val);
static bool isScopeRef(const Metadata *MD) {
if (!MD)
return true;
if (auto *S = dyn_cast<MDString>(MD))
return !S->getString().empty();
return isa<MDNode>(MD);
}
/// \brief Check if a field at position Elt of a MDNode can be a ScopeRef.
static bool fieldIsScopeRef(const MDNode *DbgNode, unsigned Elt) {
Value *Fld = getField(DbgNode, Elt);
return isScopeRef(Fld);
return isScopeRef(dyn_cast_or_null<Metadata>(getField(DbgNode, Elt)));
}
bool DIType::Verify() const {
@ -1465,19 +1467,19 @@ void DIVariable::printExtendedName(raw_ostream &OS) const {
}
}
template <> DIRef<DIScope>::DIRef(const Value *V) : Val(V) {
template <> DIRef<DIScope>::DIRef(const Metadata *V) : Val(V) {
assert(isScopeRef(V) && "DIScopeRef should be a MDString or MDNode");
}
template <> DIRef<DIType>::DIRef(const Value *V) : Val(V) {
template <> DIRef<DIType>::DIRef(const Metadata *V) : Val(V) {
assert(isTypeRef(V) && "DITypeRef should be a MDString or MDNode");
}
template <>
DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const {
return DIScopeRef(getField(DbgNode, Elt));
return DIScopeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
}
template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const {
return DITypeRef(getField(DbgNode, Elt));
return DITypeRef(cast_or_null<Metadata>(getField(DbgNode, Elt)));
}
bool llvm::StripDebugInfo(Module &M) {