Bugpoint support for miscompilations that result in a crash.

This change allows bugpoint to pinpoint the "opt" pass and bitcode
segment responsible for a crash caused by miscompilation. At least it
works well for me now, without having to create any custom execution
wrappers.

llvm-svn: 131186

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/include/llvm/Support/Program.h b/llvm/include/llvm/Support/Program.h
index 96b35660f96..986c53e908d 100644
--- a/llvm/include/llvm/Support/Program.h
+++ b/llvm/include/llvm/Support/Program.h
@@ -96,9 +96,11 @@ namespace sys {
       ///< expires, the child is killed and this call returns. If zero,
       ///< this function will wait until the child finishes or forever if
       ///< it doesn't.
-      std::string* ErrMsg ///< If non-zero, provides a pointer to a string
+      std::string* ErrMsg, ///< If non-zero, provides a pointer to a string
       ///< instance in which error messages will be returned. If the string
       ///< is non-empty upon return an error occurred while waiting.
+      const char *SignalPrefix ///< If non-zero, provides a prefix to be
+      ///< prepended to ErrMsg if the process is terminated abnormally.
       );
 
     /// This function terminates the program.
@@ -137,7 +139,8 @@ namespace sys {
                               const sys::Path** redirects = 0,
                               unsigned secondsToWait = 0,
                               unsigned memoryLimit = 0,
-                              std::string* ErrMsg = 0);
+                              std::string* ErrMsg = 0,
+                              const char *SignalPrefix = 0);
 
     /// A convenience function equivalent to Program prg; prg.Execute(..);
     /// @see Execute