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IR: Stop erasing MDNodes from uniquing sets during teardown

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Stop erasing `MDNode`s from the uniquing sets in `LLVMContextImpl`
during teardown (in particular, during
`UniquableMDNode::~UniquableMDNode()`).  Although it's currently
feasible, there isn't any clear benefit and it may not be feasible for
other subclasses (which don't explicitly store the lookup hash).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225696 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-12 20:50:25 +00:00
parent 9e3e492f03
commit d1ec4f037d
3 changed files with 10 additions and 24 deletions
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4
include/llvm/IR/Metadata.h
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@ -722,7 +722,7 @@ protected:
/// resolveCycles() is called). /// resolveCycles() is called).
UniquableMDNode(LLVMContext &C, unsigned ID, ArrayRef<Metadata *> Vals, UniquableMDNode(LLVMContext &C, unsigned ID, ArrayRef<Metadata *> Vals,
bool AllowRAUW); bool AllowRAUW);
~UniquableMDNode(); ~UniquableMDNode() {}
void storeDistinctInContext(); void storeDistinctInContext();
@ -767,7 +767,7 @@ class MDTuple : public UniquableMDNode {
MDTuple(LLVMContext &C, ArrayRef<Metadata *> Vals, bool AllowRAUW) MDTuple(LLVMContext &C, ArrayRef<Metadata *> Vals, bool AllowRAUW)
: UniquableMDNode(C, MDTupleKind, Vals, AllowRAUW) {} : UniquableMDNode(C, MDTupleKind, Vals, AllowRAUW) {}
~MDTuple(); ~MDTuple() { dropAllReferences(); }
void setHash(unsigned Hash) { MDNodeSubclassData = Hash; } void setHash(unsigned Hash) { MDNodeSubclassData = Hash; }
void recalculateHash(); void recalculateHash();

18
lib/IR/LLVMContextImpl.cpp
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@ -135,18 +135,16 @@ LLVMContextImpl::~LLVMContextImpl() {
for (auto &Pair : ValuesAsMetadata) for (auto &Pair : ValuesAsMetadata)
delete Pair.second; delete Pair.second;
// Destroy MDNodes. ~MDNode can move and remove nodes between the MDTuples // Destroy MDNodes.
// and the DistinctMDNodes sets, so copy the values out first. for (auto *I : DistinctMDNodes)
SmallVector<UniquableMDNode *, 8> Uniquables;
Uniquables.reserve(MDTuples.size() + DistinctMDNodes.size());
Uniquables.append(MDTuples.begin(), MDTuples.end());
Uniquables.append(DistinctMDNodes.begin(), DistinctMDNodes.end());
for (UniquableMDNode *I : Uniquables)
I->dropAllReferences(); I->dropAllReferences();
for (UniquableMDNode *I : Uniquables) for (auto *I : MDTuples)
I->dropAllReferences();
for (UniquableMDNode *I : DistinctMDNodes)
delete cast<MDTuple>(I); delete cast<MDTuple>(I);
assert(MDTuples.empty() && DistinctMDNodes.empty() && for (MDTuple *I : MDTuples)
"Destroying all MDNodes didn't empty the Context's sets."); delete I;
// Destroy MDStrings. // Destroy MDStrings.
MDStringCache.clear(); MDStringCache.clear();

12
lib/IR/Metadata.cpp
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@ -427,13 +427,6 @@ UniquableMDNode::UniquableMDNode(LLVMContext &C, unsigned ID,
SubclassData32 = NumUnresolved; SubclassData32 = NumUnresolved;
} }
UniquableMDNode::~UniquableMDNode() {
if (isStoredDistinctInContext())
getContext().pImpl->DistinctMDNodes.erase(this);
dropAllReferences();
}
void UniquableMDNode::resolve() { void UniquableMDNode::resolve() {
assert(!isResolved() && "Expected this to be unresolved"); assert(!isResolved() && "Expected this to be unresolved");
@ -481,11 +474,6 @@ void UniquableMDNode::resolveCycles() {
} }
} }
MDTuple::~MDTuple() {
if (!isStoredDistinctInContext())
getContext().pImpl->MDTuples.erase(this);
}
void MDTuple::recalculateHash() { void MDTuple::recalculateHash() {
setHash(hash_combine_range(op_begin(), op_end())); setHash(hash_combine_range(op_begin(), op_end()));
#ifndef NDEBUG #ifndef NDEBUG