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Version N of the llvm_unreachable patch: VC++ doesn't recognize that abort()

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doesn't return, so just go back to using the old runtime function instead
of trying to use abort() when __builtin_unreachable (or an equivalent) isn't
supported.

llvm-svn: 127629
This commit is contained in:
John McCall 2011-03-14 22:41:50 +00:00
parent 4c9d4ab277
commit cb1d6e9690
2 changed files with 11 additions and 10 deletions
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4
include/llvm/Support/Compiler.h
View File

@ -128,12 +128,10 @@
// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
// to an expression which states that it is undefined behavior for the
// compiler to reach this point.
// compiler to reach this point. Otherwise is not defined.
#if defined(__clang__) || (__GNUC__ > 4) \
|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
#else
# define LLVM_BUILTIN_UNREACHABLE abort()
#endif
#endif

17
include/llvm/Support/ErrorHandling.h
View File

@ -86,18 +86,21 @@ namespace llvm {
unsigned line=0);
}
/// Prints the message and location info to stderr in !NDEBUG builds.
/// This is intended to be used for "impossible" situations that imply
/// a bug in the compiler.
/// Marks that the current location is not supposed to be reachable.
/// In !NDEBUG builds, prints the message and location info to stderr.
/// In NDEBUG builds, becomes an optimizer hint that the current location
/// is not supposed to be reachable. On compilers that don't support
/// such hints, prints a reduced message instead.
///
/// In NDEBUG mode it only prints "UNREACHABLE executed".
/// Use this instead of assert(0), so that the compiler knows this path
/// is not reachable even for NDEBUG builds.
/// Use this instead of assert(0). It conveys intent more clearly and
/// allows compilers to omit some unnecessary code.
#ifndef NDEBUG
#define llvm_unreachable(msg) \
::llvm::llvm_unreachable_internal(msg, __FILE__, __LINE__)
#else
#elif defined(LLVM_BUILTIN_UNREACHABLE)
#define llvm_unreachable(msg) LLVM_BUILTIN_UNREACHABLE
#else
#define llvm_unreachable(msg) ::llvm::llvm_unreachable_internal()
#endif
#endif