other/7620: gij doesn't work properly on SH port.

[kkojima@gcc.gnu.org]

>Number:         7620
>Category:       other
>Synopsis:       gij doesn't work properly on SH port.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 16 18:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     kkojima@gcc.gnu.org
>Release:        3.3 20020808 (experimental)
>Organization:
>Environment:
host: sh4-unknown-linux-gnu
build: sh4-unknown-linux-gnu
target: sh4-unknown-linux-gnu
>Description:
Automatic variable sized array is clobbered when the sjlj
exception is threw.
Compiler generates the code which _Unwind_SjLj_Register is
called before allocating stack for a variable sized array
which is automatic variable. So the stack pointer is set
higher than such arrays when the exception threw, and the
contents of these arrays are clobbered.
>How-To-Repeat:
Compile the following source with cc1plus for sh4-unknown-linux-gnu
target configured with --enable-sjlj-exceptions and look its
output.

-- aa.cc --
void foo (int);
void bar (int *) throw (int);
int a;

void
f (int max_stack)
{
  int aa[max_stack];
  int *sp = aa;

  try
    {
      bar (aa);
      return;
    }
  catch (int e)
    {
      foo (e);
      a = *sp;
    }
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: