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Date: Wed, 27 Mar 2002 15:06:00 -0000
Message-ID: <20020327230602.20125.qmail@sources.redhat.com>
To: tromey@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org,
From: Tom Tromey <tromey@redhat.com>
Subject: Re: java/5986: SIGSEGV in __gcj_personality_v0
Reply-To: Tom Tromey <tromey@redhat.com>
X-SW-Source: 2002-03/txt/msg01053.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR java/5986; it has been noted by GNATS.

From: Tom Tromey <tromey@redhat.com>
To: Jeff Sturm <jsturm@one-point.com>
Cc: gcc-gnats@gcc.gnu.org, Alexandre Petit-Bianco <apbianco@redhat.com>
Subject: Re: java/5986: SIGSEGV in __gcj_personality_v0
Date: 27 Mar 2002 16:39:29 -0700

 Jeff> Try this one.
 
 This patch fixes the problem for me.  I think the comment explains
 what is going on; if you think of a way to improve it let me know.
 
 I've only tested this minimally.  Could you try it on your code?
 
 Alex, as always, I desire your input.
 
 Tom
 
 Index: ChangeLog
 from  Tom Tromey  <tromey@redhat.com>
 
 	* except.c (expand_end_java_handler): If the handler type is NULL,
 	use java.lang.Throwable.  Fixes PR java/5986.
 
 Index: except.c
 ===================================================================
 RCS file: /cvs/gcc/gcc/gcc/java/except.c,v
 retrieving revision 1.26
 diff -u -r1.26 except.c
 --- except.c 2001/03/28 11:01:47 1.26
 +++ except.c 2002/03/27 23:03:07
 @@ -1,5 +1,5 @@
  /* Handle exceptions for GNU compiler for the Java(TM) language.
 -   Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
 +   Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
  
  This file is part of GNU CC.
  
 @@ -372,7 +372,17 @@
    expand_start_all_catch ();
    for ( ; handler != NULL_TREE; handler = TREE_CHAIN (handler))
      {
 -      expand_start_catch (TREE_PURPOSE (handler));
 +      /* For bytecode we treat exceptions a little unusually.  A
 +	 `finally' clause looks like an ordinary exception handler for
 +	 Throwable.  The reason for this is that the bytecode has
 +	 already expanded the finally logic, and we would have to do
 +	 extra (and difficult) work to get this to look like a
 +	 gcc-style finally clause.  */
 +      tree type = TREE_PURPOSE (handler);
 +      if (type == NULL)
 +	type = throwable_type_node;
 +
 +      expand_start_catch (type);
        expand_goto (TREE_VALUE (handler));
        expand_end_catch ();
      }