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[WinEH] Find correct cloned entry block for outlined handler functions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235789 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor 2015-04-24 23:10:38 +00:00
parent 9418133055
commit 7d3dd38582
1 changed files with 13 additions and 4 deletions
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17
lib/CodeGen/WinEHPrepare.cpp
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@ -1179,10 +1179,19 @@ bool WinEHPrepare::outlineHandler(ActionHandler *Action, Function *SrcFn,
/*ModuleLevelChanges=*/false, Returns, "",
&OutlinedFunctionInfo, Director.get());
// Move all the instructions in the first cloned block into our entry block.
BasicBlock *FirstClonedBB = std::next(Function::iterator(Entry));
Entry->getInstList().splice(Entry->end(), FirstClonedBB->getInstList());
FirstClonedBB->eraseFromParent();
// Move all the instructions in the cloned "entry" block into our entry block.
// Depending on how the parent function was laid out, the block that will
// correspond to the outlined entry block may not be the first block in the
// list. We can recognize it, however, as the cloned block which has no
// predecessors. Any other block wouldn't have been cloned if it didn't
// have a predecessor which was also cloned.
Function::iterator ClonedIt = std::next(Function::iterator(Entry));
while (!pred_empty(ClonedIt))
++ClonedIt;
BasicBlock *ClonedEntryBB = ClonedIt;
assert(ClonedEntryBB);
Entry->getInstList().splice(Entry->end(), ClonedEntryBB->getInstList());
ClonedEntryBB->eraseFromParent();
// Make sure we can identify the handler's personality later.
addStubInvokeToHandlerIfNeeded(Handler, LPad->getPersonalityFn());