Hi, I have a problem with JIT code generation on mac. The LLVM-IR I have is fine, but the machine code generated crashes. I see two instructions "add %al,(%eax)" (which are four 0 bytes, numerically) prior to function calls. As eax holds the pointer to the called function, this crashes with SIGBUS. These instructions don't make sense in the context of the code, which is why I'm suspecting a code generation error. I'd appreciate any any suggestions regarding what could cause this behavior or where to look for clues. Thanks, Eran Weiss. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120912/eb87d5e9/attachment.html>
"Weiss, Eran" <Eran.Weiss at emc.com> writes:> I have a problem with JIT code generation on mac. The LLVM-IR I have > is fine, but the machine code generated crashes. I see two > instructions "add %al,(%eax)" (which are four 0 bytes, numerically) > prior to function calls. As eax holds the pointer to the called > function, this crashes with SIGBUS. These instructions don't make > sense in the context of the code, which is why I'm suspecting a code > generation error. I'd appreciate any any suggestions regarding what > could cause this behavior or where to look for clues.The most effective way of dealing with this type of problems is to create a complete, minimal test case and file a bug report. Once done this, the usual outcome is that either the bug is quickly fixed or the comments from others will help you on your understanding of the problem.
Can you reduce the test case and open a bug report (http://llvm.org/bugs/) ? Can you check if your code works using static compilation ? On Sep 12, 2012, at 9:07 AM, "Weiss, Eran" <Eran.Weiss at emc.com> wrote:> I see two instructions "add %al,(%eax)" (which are four 0 bytes, numerically) prior to function calls. As eax holds the pointer to the called function, this crashes with SIGBUS. These instructions don't make sense in the context of the code, which is why I'm suspecting a code generation error. I'd appreciate any any suggestions regarding what could cause this behavior or where to look for clues. >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120919/d19fef6d/attachment.html>