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author | Shuxin Yang <shuxin.llvm@gmail.com> | 2012-10-19 20:11:16 +0000 |
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committer | Shuxin Yang <shuxin.llvm@gmail.com> | 2012-10-19 20:11:16 +0000 |
commit | 970755e5197afb42a76a24a74cd6dc17721daf50 (patch) | |
tree | 6cfad3c8b2c649d34e247dfa22c2a1c73af9cdac /lib/Target/X86/X86ISelLowering.cpp | |
parent | 9abfbdfc77efe715314f8ed673a7b6d25c00ca48 (diff) | |
download | llvm-970755e5197afb42a76a24a74cd6dc17721daf50.tar.gz llvm-970755e5197afb42a76a24a74cd6dc17721daf50.tar.bz2 llvm-970755e5197afb42a76a24a74cd6dc17721daf50.tar.xz |
This patch is to fix radar://8426430. It is about llvm support of __builtin_debugtrap()
which is supposed to consistently raise SIGTRAP across all systems. In contrast,
__builtin_trap() behave differently on different systems. e.g. it raises SIGTRAP on ARM, and
SIGILL on X86. The purpose of __builtin_debugtrap() is to consistently provide "trap"
functionality, in the mean time preserve the compatibility with on gcc on __builtin_trap().
The X86 backend is already able to handle debugtrap(). This patch is to:
1) make front-end recognize "__builtin_debugtrap()" (emboddied in the one-line change to Clang).
2) In DAG legalization phase, by default, "debugtrap" will be replaced with "trap", which
make the __builtin_debugtrap() "available" to all existing ports without the hassle of
changing their code.
3) If trap-function is specified (via -trap-func=xyz to llc), both __builtin_debugtrap() and
__builtin_trap() will be expanded into the function call of the specified trap function.
This behavior may need change in the future.
The provided testing-case is to make sure 2) and 3) are working for ARM port, and we
already have a testing case for x86.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166300 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86ISelLowering.cpp')
-rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 2e77e64f2f..5034cc0330 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -557,6 +557,7 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM) setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom); setOperationAction(ISD::TRAP, MVT::Other, Legal); + setOperationAction(ISD::DEBUGTRAP, MVT::Other, Legal); // VASTART needs to be custom lowered to use the VarArgsFrameIndex setOperationAction(ISD::VASTART , MVT::Other, Custom); |