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Re-committing r228628 with a fix for 64-bit builds. 

On Windows, we now use RaiseException to generate the kind of trap we require (one which calls our vectored exception handler), and fall back to using a volatile write to simulate a trap elsewhere.

llvm-svn: 228691
This commit is contained in:
Aaron Ballman 2015-02-10 14:28:11 +00:00
parent 1703a68283
commit 45ef715768
1 changed files with 13 additions and 0 deletions
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13
llvm/include/llvm/Support/Compiler.h
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@ -287,6 +287,19 @@
/// which causes the program to exit abnormally.
#if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
# define LLVM_BUILTIN_TRAP __builtin_trap()
#elif defined(LLVM_ON_WIN32)
#if defined(_WIN64)
extern "C" __declspec(dllimport) void __stdcall RaiseException(
unsigned long, unsigned long, unsigned long, const unsigned long long *);
#else
extern "C" __declspec(dllimport) void __stdcall RaiseException(
unsigned long, unsigned long, unsigned long, const unsigned long *);
#endif
# define LLVM_BUILTIN_TRAP \
do { \
::RaiseException(0xDEADD0D0, 0x1 /*EXCEPTION_NONCONTINUABLE*/, 0, nullptr);\
__assume(false); \
} while (0)
#else
# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
#endif