Enable DWARF2 exceptions on PPC

[Andrew Haley <aph at cambridge dot redhat dot com>]

Use the new DWARF2 exceptions on PPC.  With this I get 0 failures on
the libgcj testsuite.

Added to the trunk and the branch.

Andrew.


2001-05-18  Andrew Haley  <aph@cambridge.redhat.com>

	* include/dwarf2-signal.h: New file.	
	* configure.in (SYSDEP_SOURCES): Add dwarf2-signal.h for PPC.
	* configure.host (EXCEPTIONSPEC): Don't use sjlj on PPC.
        * configure: Rebuilt.

Index: include/dwarf2-signal.h
===================================================================
RCS file: dwarf2-signal.h
diff -N dwarf2-signal.h
*** /dev/null	Tue May  5 13:32:27 1998
--- dwarf2-signal.h	Mon May 21 09:23:37 2001
***************
*** 0 ****
--- 1,72 ----
+ // dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
+ 
+ /* Copyright (C) 2000  Free Software Foundation
+ 
+    This file is part of libgcj.
+ 
+    Use this file for every target for which the dwarf2 unwinder in
+    libgcc can unwind through signal handlers and no special actions
+    are needed.
+ 
+ This software is copyrighted work licensed under the terms of the
+ Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+ details.  */
+ 
+ #ifndef JAVA_SIGNAL_H
+ #define JAVA_SIGNAL_H 1
+ 
+ #include <signal.h>
+ #include <sys/syscall.h>
+ 
+ #define HANDLE_SEGV 1
+ #undef HANDLE_FPE
+ 
+ #define SIGNAL_HANDLER(_name)	\
+ static void _Jv_##_name (int)
+ 
+ class java::lang::Throwable;
+ 
+ // Unwind the stack to the point at which the signal was generated and
+ // then throw an exception.  With the dwarf2 unwinder we don't need to
+ // do anything.
+ 
+ #define MAKE_THROW_FRAME(_exception)		\
+ do						\
+ {						\
+ }						\
+ while (0)
+ 
+ 
+ #define INIT_SEGV						\
+ do								\
+   {								\
+     nullp = new java::lang::NullPointerException ();    	\
+     struct sigaction act;					\
+     act.sa_handler = _Jv_catch_segv;				\
+     sigemptyset (&act.sa_mask);					\
+     act.sa_flags = 0;						\
+     syscall (SYS_sigaction, SIGSEGV, &act, NULL);		\
+   }								\
+ while (0)  
+ 
+ #define INIT_FPE						\
+ do								\
+   { 								\
+     arithexception = new java::lang::ArithmeticException 	\
+       (JvNewStringLatin1 ("/ by zero"));			\
+     struct sigaction act;					\
+     act.sa_handler = _Jv_catch_fpe;				\
+     sigemptyset (&act.sa_mask);					\
+     act.sa_flags = 0;						\
+     syscall (SYS_sigaction, SIGFPE, &act, NULL);		\
+   }								\
+ while (0)  
+ 
+ /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
+  * sigaction() because on some systems the pthreads wrappers for
+  * signal handlers are not compiled with unwind information, so it's
+  * not possible to unwind through them.  This is a problem that will
+  * go away once all systems have pthreads libraries that are
+  * compiled with full unwind info.  */
+ 
+ #endif /* JAVA_SIGNAL_H */
Index: configure.in
===================================================================
RCS file: /cvs/gcc/gcc/libjava/configure.in,v
retrieving revision 1.73.2.7
diff -c -2 -p -r1.73.2.7 configure.in
*** configure.in	2001/05/14 17:45:15	1.73.2.7
--- configure.in	2001/05/21 16:24:46
*************** case "${host}" in
*** 746,749 ****
--- 746,752 ----
  #    test -d sysdep || mkdir sysdep
  #    ;;
+  powerpc-*-linux*)
+     SIGNAL_HANDLER=include/dwarf2-signal.h
+     ;;
   *)
      SIGNAL_HANDLER=include/default-signal.h
Index: configure.host
===================================================================
RCS file: /cvs/gcc/gcc/libjava/configure.host,v
retrieving revision 1.15.2.3
diff -c -2 -p -r1.15.2.3 configure.host
*** configure.host	2001/05/14 17:45:15	1.15.2.3
--- configure.host	2001/05/21 16:24:46
*************** case "${host}" in
*** 68,72 ****
  	libgcj_flags="${libgcj_flags} -mieee"
  	libgcj_interpreter=yes
- 	libgcj_sjlj=yes
  	;;
    powerpc*-*)
--- 68,71 ----