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Fix __builtin_setjmp in combination with sjlj exception handling.

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llvm.eh.sjlj.setjmp was used as part of the SjLj exception handling
style but is also used in clang to implement __builtin_setjmp.  The ARM
backend needs to output additional dispatch tables for the SjLj
exception handling style, these tables however can't be emitted if
llvm.eh.sjlj.setjmp is simply used for __builtin_setjmp and no actual
landing pad blocks exist.

To solve this issue a new llvm.eh.sjlj.setup_dispatch intrinsic is
introduced which is used instead of llvm.eh.sjlj.setjmp in the SjLj
exception handling lowering, so we can differentiate between the case
where we actually need to setup a dispatch table and the case where we
just need the __builtin_setjmp semantic.

Differential Revision: http://reviews.llvm.org/D9313

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242481 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-16 22:34:16 +00:00
parent ec56faaa64
commit 9e4654db1a
10 changed files with 157 additions and 10 deletions
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1
lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
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@@ -102,6 +102,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
case ISD::EH_RETURN: return "EH_RETURN";
case ISD::EH_SJLJ_SETJMP: return "EH_SJLJ_SETJMP";
case ISD::EH_SJLJ_LONGJMP: return "EH_SJLJ_LONGJMP";
case ISD::EH_SJLJ_SETUP_DISPATCH: return "EH_SJLJ_SETUP_DISPATCH";
case ISD::ConstantPool: return "ConstantPool";
case ISD::TargetIndex: return "TargetIndex";
case ISD::ExternalSymbol: return "ExternalSymbol";