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IR: Add a configuration point for MDNodeInfo::isEqual, NFC 

This commit has no functionality change, but it adds a configuration
point for MDNodeInfo::isEqual to allow custom uniquing of subclasses of
MDNode, minimizing the diff of a follow-up.

llvm-svn: 266542
This commit is contained in:
Duncan P. N. Exon Smith 2016-04-16 23:42:04 +00:00
parent a770a7ec5d
commit f22912780d
1 changed files with 18 additions and 2 deletions
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20
llvm/lib/IR/LLVMContextImpl.h
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@ -211,6 +211,17 @@ public:
template <class NodeTy> struct MDNodeKeyImpl;
template <class NodeTy> struct MDNodeInfo;
/// Configuration point for MDNodeInfo::isEqual().
template <class NodeTy> struct MDNodeSubsetEqualImpl {
typedef MDNodeKeyImpl<NodeTy> KeyTy;
static bool isSubsetEqual(const KeyTy &LHS, const NodeTy *RHS) {
return false;
}
static bool isSubsetEqual(const NodeTy *LHS, const NodeTy *RHS) {
return false;
}
};
/// \brief DenseMapInfo for MDTuple.
///
/// Note that we don't need the is-function-local bit, since that's implicit in
@ -845,6 +856,7 @@ template <> struct MDNodeKeyImpl<DIMacroFile> {
/// \brief DenseMapInfo for MDNode subclasses.
template <class NodeTy> struct MDNodeInfo {
typedef MDNodeKeyImpl<NodeTy> KeyTy;
typedef MDNodeSubsetEqualImpl<NodeTy> SubsetEqualTy;
static inline NodeTy *getEmptyKey() {
return DenseMapInfo<NodeTy *>::getEmptyKey();
}
@ -858,10 +870,14 @@ template <class NodeTy> struct MDNodeInfo {
static bool isEqual(const KeyTy &LHS, const NodeTy *RHS) {
if (RHS == getEmptyKey() || RHS == getTombstoneKey())
return false;
return LHS.isKeyOf(RHS);
return SubsetEqualTy::isSubsetEqual(LHS, RHS) || LHS.isKeyOf(RHS);
}
static bool isEqual(const NodeTy *LHS, const NodeTy *RHS) {
return LHS == RHS;
if (LHS == RHS)
return true;
if (RHS == getEmptyKey() || RHS == getTombstoneKey())
return false;
return SubsetEqualTy::isSubsetEqual(LHS, RHS);
}
};