[LLVMbugs] [Bug 12107] New: __builtin_longjmp code not generated for Arm.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12107

             Bug #: 12107
           Summary: __builtin_longjmp code not generated for Arm.
           Product: clang
           Version: 3.0
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nikhil.girdhar at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


I have a simple test program to test the functionality of builtin
setjmp/longjmp.

#include "setjmp.h"

int buf[12];

void foo_l(){

  __builtin_longjmp(buf,1);

}


int foo_s(int x){
  int prev =0;

  __builtin_setjmp(buf);

  if(prev == 0)
    while(1)
     {
       prev = 1;
       foo_l();   //Point A
     }
  if(prev == 0)
     return 0;
  else
     return x;
}

int main(void)
{
  if(foo_s(1) == 0)
    abort();

  return 0;
}

This program when compiled with clang for march=armv7-a generates a
segmentation fault. On execution of foo_l() at Point A code flow is transferred
to the beginning of the foo_s.

On further investigating the assembly code I found that the code for
__builtin_longjmp is not generated i.e. foo_l is an empty label in the .s file.

On the other hand the program executes correctly if library calls for
setjmp/longjmp are used instead of the builtins.

Please give some pointers.

Regards,
Nikhil.

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.