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74 lines
2.9 KiB
Diff
74 lines
2.9 KiB
Diff
Pull in r221709 from upstream llvm trunk (by Frédéric Riss):
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Totally forget deallocated SDNodes in SDDbgInfo.
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What would happen before that commit is that the SDDbgValues associated with
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a deallocated SDNode would be marked Invalidated, but SDDbgInfo would keep
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a map entry keyed by the SDNode pointer pointing to this list of invalidated
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SDDbgNodes. As the memory gets reused, the list might get wrongly associated
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with another new SDNode. As the SDDbgValues are cloned when they are transfered,
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this can lead to an exponential number of SDDbgValues being produced during
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DAGCombine like in http://llvm.org/bugs/show_bug.cgi?id=20893
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Note that the previous behavior wasn't really buggy as the invalidation made
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sure that the SDDbgValues won't be used. This commit can be considered a
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memory optimization and as such is really hard to validate in a unit-test.
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This should fix abnormally large memory usage and resulting OOM crashes
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when compiling certain ports with debug information.
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Reported by: Dmitry Marakasov <amdmi3@amdmi3.ru>
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Upstream PRs: http://llvm.org/PR19031 http://llvm.org/PR20893
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Introduced here: http://svnweb.freebsd.org/changeset/base/274442
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Index: include/llvm/CodeGen/SelectionDAG.h
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===================================================================
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--- include/llvm/CodeGen/SelectionDAG.h
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+++ include/llvm/CodeGen/SelectionDAG.h
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@@ -126,6 +126,10 @@ class SDDbgInfo {
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DbgValMap[Node].push_back(V);
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}
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+ /// \brief Invalidate all DbgValues attached to the node and remove
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+ /// it from the Node-to-DbgValues map.
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+ void erase(const SDNode *Node);
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+
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void clear() {
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DbgValMap.clear();
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DbgValues.clear();
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Index: lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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===================================================================
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--- lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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+++ lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -686,6 +686,15 @@ void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *
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DeallocateNode(N);
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}
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+void SDDbgInfo::erase(const SDNode *Node) {
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+ DbgValMapType::iterator I = DbgValMap.find(Node);
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+ if (I == DbgValMap.end())
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+ return;
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+ for (unsigned J = 0, N = I->second.size(); J != N; ++J)
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+ I->second[J]->setIsInvalidated();
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+ DbgValMap.erase(I);
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+}
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+
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void SelectionDAG::DeallocateNode(SDNode *N) {
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if (N->OperandsNeedDelete)
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delete[] N->OperandList;
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@@ -696,10 +705,9 @@ void SelectionDAG::DeallocateNode(SDNode *N) {
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NodeAllocator.Deallocate(AllNodes.remove(N));
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- // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
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- ArrayRef<SDDbgValue*> DbgVals = DbgInfo->getSDDbgValues(N);
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- for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
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- DbgVals[i]->setIsInvalidated();
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+ // If any of the SDDbgValue nodes refer to this SDNode, invalidate
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+ // them and forget about that node.
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+ DbgInfo->erase(N);
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}
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/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
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