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Pull in r221709 from upstream llvm trunk (by Frédéric Riss):

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Totally forget deallocated SDNodes in SDDbgInfo.

  What would happen before that commit is that the SDDbgValues associated with
  a deallocated SDNode would be marked Invalidated, but SDDbgInfo would keep
  a map entry keyed by the SDNode pointer pointing to this list of invalidated
  SDDbgNodes. As the memory gets reused, the list might get wrongly associated
  with another new SDNode. As the SDDbgValues are cloned when they are transfered,
  this can lead to an exponential number of SDDbgValues being produced during
  DAGCombine like in http://llvm.org/bugs/show_bug.cgi?id=20893

  Note that the previous behavior wasn't really buggy as the invalidation made
  sure that the SDDbgValues won't be used. This commit can be considered a
  memory optimization and as such is really hard to validate in a unit-test.

This should fix abnormally large memory usage and resulting OOM crashes
when compiling certain ports with debug information.

Reported by:	Dmitry Marakasov <amdmi3@amdmi3.ru>
Upstream PRs:	http://llvm.org/PR19031 http://llvm.org/PR20893
MFC after:	1 week
This commit is contained in:
Dimitry Andric 2014-11-12 20:01:10 +00:00
parent c57b131994
commit 6a3e479401
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=274442
2 changed files with 16 additions and 4 deletions
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4
contrib/llvm/include/llvm/CodeGen/SelectionDAG.h
View File

@ -127,6 +127,10 @@ class SDDbgInfo {
DbgValMap[Node].push_back(V);
}
/// \brief Invalidate all DbgValues attached to the node and remove
/// it from the Node-to-DbgValues map.
void erase(const SDNode *Node);
void clear() {
DbgValMap.clear();
DbgValues.clear();

16
contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -625,6 +625,15 @@ void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
DeallocateNode(N);
}
void SDDbgInfo::erase(const SDNode *Node) {
DbgValMapType::iterator I = DbgValMap.find(Node);
if (I == DbgValMap.end())
return;
for (auto &Val: I->second)
Val->setIsInvalidated();
DbgValMap.erase(I);
}
void SelectionDAG::DeallocateNode(SDNode *N) {
if (N->OperandsNeedDelete)
delete[] N->OperandList;
@ -635,10 +644,9 @@ void SelectionDAG::DeallocateNode(SDNode *N) {
NodeAllocator.Deallocate(AllNodes.remove(N));
// If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
ArrayRef<SDDbgValue*> DbgVals = DbgInfo->getSDDbgValues(N);
for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
DbgVals[i]->setIsInvalidated();
// If any of the SDDbgValue nodes refer to this SDNode, invalidate
// them and forget about that node.
DbgInfo->erase(N);
}
/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that