[Bug c++/25266] New: SJLJ exception handling fails in function using alloca()

["t_ono at hkfreak dot net" <gcc-bugzilla at gcc dot gnu dot org>]

On both
gcc (GCC) 3.3.5 (propolice)
and
gcc.exe (GCC) 3.4.2 (mingw-special)
the following code does not work properly.

Its output should be test1<nl>test2<nl>test3<nl>, but the 3rd output gets
malformed.

It seems to me the stack is unwindded too far by sjlj-eh at the entrance of
catch block and the region obtained by alloca() is destroyed.

<test.cpp>---------------
#include "malloc.h"
#include "string.h"
#include "stdio.h"
static void foo2();
int main(int, char**)
{
  int a=0;
  a=a+1;
  char *b=(char *)alloca(10);
  strcpy(b,"test");
  printf("%s%d\n", b, a);
  try {
    a++;
    printf("%s%d\n", b, a);
    foo2();
  }
  catch(...){
    a++;
    printf("%s%d\n", b, a);
  }
  return 0;
}

static void foo2()
{
  int i=1;
  throw(i);
}


-- 
           Summary: SJLJ exception handling fails in function using alloca()
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: t_ono at hkfreak dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25266