2008-04-30 Paul Thomas <pault@gcc.gnu.org>

[pf3gnuchains/gcc-fork.git] / gcc / unwind-sjlj.c

diff --git a/gcc/unwind-sjlj.c b/gcc/unwind-sjlj.c
index 6d6fd8b..c541bd5 100644 (file)
--- a/gcc/unwind-sjlj.c
+++ b/gcc/unwind-sjlj.c
@@ -1,5 +1,5 @@
-/* DWARF2 exception handling and frame unwind runtime interface routines.
-   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
+/* SJLJ exception handling and frame unwind runtime interface routines.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006

    Free Software Foundation, Inc.
 
    This file is part of GCC.
    Free Software Foundation, Inc.
 
    This file is part of GCC.


@@ -9,6 +9,15 @@
    the Free Software Foundation; either version 2, or (at your option)
    any later version.
 
    the Free Software Foundation; either version 2, or (at your option)
    any later version.
 

+   In addition to the permissions in the GNU General Public License, the
+   Free Software Foundation gives you unlimited permission to link the
+   compiled version of this file into combinations with other programs,
+   and to distribute those combinations without any restriction coming
+   from the use of this file.  (The General Public License restrictions
+   do apply in other respects; for example, they cover modification of
+   the file, and distribution when not linked into a combined
+   executable.)
+

    GCC is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
    GCC is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public


@@ -16,8 +25,8 @@
 
    You should have received a copy of the GNU General Public License
    along with GCC; see the file COPYING.  If not, write to the Free
 
    You should have received a copy of the GNU General Public License
    along with GCC; see the file COPYING.  If not, write to the Free

-   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */

 
 #include "tconfig.h"
 #include "tsystem.h"
 
 #include "tconfig.h"
 #include "tsystem.h"


@@ -36,10 +45,14 @@ typedef void *jmp_buf[JMP_BUF_SIZE];
 extern void longjmp(jmp_buf, int) __attribute__((noreturn));
 #endif
 #else
 extern void longjmp(jmp_buf, int) __attribute__((noreturn));
 #endif
 #else

-#define setjmp __builtin_setjmp

 #define longjmp __builtin_longjmp
 #endif
 
 #define longjmp __builtin_longjmp
 #endif
 

+/* The setjmp side is dealt with in the except.c file.  */
+#undef setjmp
+#define setjmp setjmp_should_not_be_used_in_this_file
+
+

 /* This structure is allocated on the stack of the target function.
    This must match the definition created in except.c:init_eh.  */
 struct SjLj_Function_Context
 /* This structure is allocated on the stack of the target function.
    This must match the definition created in except.c:init_eh.  */
 struct SjLj_Function_Context


@@ -173,10 +186,22 @@ _Unwind_GetGR (struct _Unwind_Context *context, int index)
 /* Get the value of the CFA as saved in CONTEXT.  */
 
 _Unwind_Word
 /* Get the value of the CFA as saved in CONTEXT.  */
 
 _Unwind_Word

-_Unwind_GetCFA (struct _Unwind_Context *context)
+_Unwind_GetCFA (struct _Unwind_Context *context __attribute__((unused)))

 {
   /* ??? Ideally __builtin_setjmp places the CFA in the jmpbuf.  */
 {
   /* ??? Ideally __builtin_setjmp places the CFA in the jmpbuf.  */

-  return NULL;
+
+#ifndef DONT_USE_BUILTIN_SETJMP
+  /* This is a crude imitation of the CFA: the saved stack pointer.
+     This is roughly the CFA of the frame before CONTEXT.  When using the
+     DWARF-2 unwinder _Unwind_GetCFA returns the CFA of the frame described
+     by CONTEXT instead; but for DWARF-2 the cleanups associated with
+     CONTEXT have already been run, and for SJLJ they have not yet been.  */
+  if (context->fc != NULL)
+    return (_Unwind_Word) context->fc->jbuf[2];
+#endif
+
+  /* Otherwise we're out of luck for now.  */
+  return (_Unwind_Word) 0;

 }
 
 void
 }
 
 void


@@ -193,6 +218,16 @@ _Unwind_GetIP (struct _Unwind_Context *context)
   return context->fc->call_site + 1;
 }
 
   return context->fc->call_site + 1;
 }
 

+_Unwind_Ptr
+_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
+{
+  *ip_before_insn = 0;
+  if (context->fc != NULL)
+    return context->fc->call_site + 1;
+  else
+    return 0;
+}
+

 /* Set the return landing pad index in CONTEXT.  */
 
 void
 /* Set the return landing pad index in CONTEXT.  */
 
 void


@@ -214,7 +249,7 @@ _Unwind_GetRegionStart (struct _Unwind_Context *context __attribute__((unused))
 }
 
 void *
 }
 
 void *

-_Unwind_FindEnclosingFunction (void *pc)
+_Unwind_FindEnclosingFunction (void *pc __attribute__((unused)))

 {
   return NULL;
 }
 {
   return NULL;
 }


@@ -255,22 +290,26 @@ uw_update_context (struct _Unwind_Context *context,
   context->fc = context->fc->prev;
 }
 
   context->fc = context->fc->prev;
 }
 

+static void
+uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+  _Unwind_SjLj_Unregister (context->fc);
+  uw_update_context (context, fs);
+}
+

 static inline void
 uw_init_context (struct _Unwind_Context *context)
 {
   context->fc = _Unwind_SjLj_GetContext ();
 }
 
 static inline void
 uw_init_context (struct _Unwind_Context *context)
 {
   context->fc = _Unwind_SjLj_GetContext ();
 }
 

-/* ??? There appear to be bugs in integrate.c wrt __builtin_longjmp and
-   virtual-stack-vars.  An inline version of this segfaults on SPARC.  */
-#define uw_install_context(CURRENT, TARGET)            \
-  do                                                   \
-    {                                                  \
-      _Unwind_SjLj_SetContext ((TARGET)->fc);          \
-      longjmp ((TARGET)->fc->jbuf, 1);                 \
-    }                                                  \
-  while (0)
-
+static void __attribute__((noreturn))
+uw_install_context (struct _Unwind_Context *current __attribute__((unused)),
+                    struct _Unwind_Context *target)
+{
+  _Unwind_SjLj_SetContext (target->fc);
+  longjmp (target->fc->jbuf, 1);
+}

 
 static inline _Unwind_Ptr
 uw_identify_context (struct _Unwind_Context *context)
 
 static inline _Unwind_Ptr
 uw_identify_context (struct _Unwind_Context *context)


@@ -285,6 +324,7 @@ uw_identify_context (struct _Unwind_Context *context)
 #define _Unwind_RaiseException         _Unwind_SjLj_RaiseException
 #define _Unwind_ForcedUnwind           _Unwind_SjLj_ForcedUnwind
 #define _Unwind_Resume                 _Unwind_SjLj_Resume
 #define _Unwind_RaiseException         _Unwind_SjLj_RaiseException
 #define _Unwind_ForcedUnwind           _Unwind_SjLj_ForcedUnwind
 #define _Unwind_Resume                 _Unwind_SjLj_Resume

+#define _Unwind_Resume_or_Rethrow      _Unwind_SjLj_Resume_or_Rethrow

 
 #include "unwind.inc"
 
 
 #include "unwind.inc"