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970755e519
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
30 lines
554 B
LLVM
30 lines
554 B
LLVM
; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s -check-prefix=INSTR
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; RUN: llc < %s -mtriple=arm-apple-darwin -trap-func=_trap | FileCheck %s -check-prefix=FUNC
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; rdar://7961298
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; rdar://9249183
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define void @t() nounwind {
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entry:
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; INSTR: t:
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; INSTR: trap
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; FUNC: t:
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; FUNC: bl __trap
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call void @llvm.trap()
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unreachable
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}
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define void @t2() nounwind {
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entry:
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; INSTR: t2:
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; INSTR: trap
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; FUNC: t2:
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; FUNC: bl __trap
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call void @llvm.debugtrap()
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unreachable
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}
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declare void @llvm.trap() nounwind
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declare void @llvm.debugtrap() nounwind
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