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[WinEH] Avoid holding references to BlockColor (DenseMap) entries while inserting new elements

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Differential Revision: https://reviews.llvm.org/D27693



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289694 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor 2016-12-14 19:30:18 +00:00
parent 1f177f4a3f
commit 577bb06589
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/WinEHPrepare.cpp
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@ -1202,8 +1202,12 @@ void WinEHPrepare::replaceUseWithLoad(Value *V, Use &U, AllocaInst *&SpillSlot,
Goto->setSuccessor(0, PHIBlock);
CatchRet->setSuccessor(NewBlock);
// Update the color mapping for the newly split edge.
// Grab a reference to the ColorVector to be inserted before getting the
// reference to the vector we are copying because inserting the new
// element in BlockColors might cause the map to be reallocated.
ColorVector &ColorsForNewBlock = BlockColors[NewBlock];
ColorVector &ColorsForPHIBlock = BlockColors[PHIBlock];
BlockColors[NewBlock] = ColorsForPHIBlock;
ColorsForNewBlock = ColorsForPHIBlock;
for (BasicBlock *FuncletPad : ColorsForPHIBlock)
FuncletBlocks[FuncletPad].push_back(NewBlock);
// Treat the new block as incoming for load insertion.