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Add comment explaining the necessity of r93456

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llvm-svn: 93459
This commit is contained in:
Jim Grosbach 2010-01-14 21:38:31 +00:00
parent ceabb11a5e
commit fb10749b6d
1 changed files with 5 additions and 0 deletions
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5
lib/CodeGen/LLVMTargetMachine.cpp
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@ -280,6 +280,11 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
{
case ExceptionHandling::SjLj:
// SjLj piggy-backs on dwarf for this bit. The cleanups done apply to both
// Dwarf EH prepare needs to be run after SjLj prepare. Otherwise,
// catch info can get misplaced when a selector ends up more than one block
// removed from the parent invoke(s). This could happen when a landing
// pad is shared by multiple invokes and is also a target of a normal
// edge from elsewhere.
PM.add(createSjLjEHPass(getTargetLowering()));
PM.add(createDwarfEHPass(getTargetLowering(), OptLevel==CodeGenOpt::None));
break;