Imported gcc-4.4.3

[msp430-gcc.git] / gcc / unwind.inc

diff --git a/gcc/unwind.inc b/gcc/unwind.inc
index f00441ea02430c280ac9439c39883990e7b17d01..5e2ec29c79a00884e2f448feabd364c189a79f5b 100644 (file)
--- a/gcc/unwind.inc
+++ b/gcc/unwind.inc
@@ -1,11 +1,11 @@
 /* Exception handling and frame unwind runtime interface routines. -*- C -*-
 /* Exception handling and frame unwind runtime interface routines. -*- C -*-

-   Copyright (C) 2001 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2003, 2008, 2009 Free Software Foundation, Inc.

 
    This file is part of GCC.
 
    GCC is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
 
    This file is part of GCC.
 
    GCC is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by

-   the Free Software Foundation; either version 2, or (at your option)
+   the Free Software Foundation; either version 3, or (at your option)

    any later version.
 
    GCC is distributed in the hope that it will be useful, but WITHOUT
    any later version.
 
    GCC is distributed in the hope that it will be useful, but WITHOUT


@@ -13,14 +13,19 @@
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
    License for more details.
 
    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
    License for more details.
 

-   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.  */
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */

 
 /* This is derived from the C++ ABI for IA-64.  Where we diverge
    for cross-architecture compatibility are noted with "@@@".  
 
 /* This is derived from the C++ ABI for IA-64.  Where we diverge
    for cross-architecture compatibility are noted with "@@@".  

-   This file is included from unwind-dw2.c or unwind-ia64.c.  */
+   This file is included from unwind-dw2.c, unwind-sjlj.c or
+   unwind-ia64.c.  */

 
 /* Subroutine of _Unwind_RaiseException also invoked from _Unwind_Resume. 
 
 
 /* Subroutine of _Unwind_RaiseException also invoked from _Unwind_Resume. 
 


@@ -63,8 +68,7 @@ _Unwind_RaiseException_Phase2(struct _Unwind_Exception *exc,
        }
 
       /* Don't let us unwind past the handler context.  */
        }
 
       /* Don't let us unwind past the handler context.  */

-      if (match_handler)
-       abort ();
+      gcc_assert (!match_handler);

 
       uw_update_context (context, &fs);
     }
 
       uw_update_context (context, &fs);
     }


@@ -72,15 +76,15 @@ _Unwind_RaiseException_Phase2(struct _Unwind_Exception *exc,
   return code;
 }
 
   return code;
 }
 

-

 /* Raise an exception, passing along the given exception object.  */
 
 /* Raise an exception, passing along the given exception object.  */
 

-_Unwind_Reason_Code
+_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE

 _Unwind_RaiseException(struct _Unwind_Exception *exc)
 {
   struct _Unwind_Context this_context, cur_context;
   _Unwind_Reason_Code code;
 
 _Unwind_RaiseException(struct _Unwind_Exception *exc)
 {
   struct _Unwind_Context this_context, cur_context;
   _Unwind_Reason_Code code;
 

+  /* Set up this_context to describe the current stack frame.  */

   uw_init_context (&this_context);
   cur_context = this_context;
 
   uw_init_context (&this_context);
   cur_context = this_context;
 


@@ -90,6 +94,8 @@ _Unwind_RaiseException(struct _Unwind_Exception *exc)
     {
       _Unwind_FrameState fs;
 
     {
       _Unwind_FrameState fs;
 

+      /* Set up fs to describe the FDE for the caller of cur_context.  The
+        first time through the loop, that means __cxa_throw.  */

       code = uw_frame_state_for (&cur_context, &fs);
 
       if (code == _URC_END_OF_STACK)
       code = uw_frame_state_for (&cur_context, &fs);
 
       if (code == _URC_END_OF_STACK)


@@ -97,7 +103,7 @@ _Unwind_RaiseException(struct _Unwind_Exception *exc)
        return _URC_END_OF_STACK;
 
       if (code != _URC_NO_REASON)
        return _URC_END_OF_STACK;
 
       if (code != _URC_NO_REASON)

-       /* Some error encountered.  Ususally the unwinder doesn't
+       /* Some error encountered.  Usually the unwinder doesn't

           diagnose these and merely crashes.  */
        return _URC_FATAL_PHASE1_ERROR;
 
           diagnose these and merely crashes.  */
        return _URC_FATAL_PHASE1_ERROR;
 


@@ -112,6 +118,7 @@ _Unwind_RaiseException(struct _Unwind_Exception *exc)
            return _URC_FATAL_PHASE1_ERROR;
        }
 
            return _URC_FATAL_PHASE1_ERROR;
        }
 

+      /* Update cur_context to describe the same frame as fs.  */

       uw_update_context (&cur_context, &fs);
     }
 
       uw_update_context (&cur_context, &fs);
     }
 


@@ -132,8 +139,8 @@ _Unwind_RaiseException(struct _Unwind_Exception *exc)
 /* Subroutine of _Unwind_ForcedUnwind also invoked from _Unwind_Resume.  */
 
 static _Unwind_Reason_Code
 /* Subroutine of _Unwind_ForcedUnwind also invoked from _Unwind_Resume.  */
 
 static _Unwind_Reason_Code

-_Unwind_ForcedUnwind_Phase2(struct _Unwind_Exception *exc,
-                           struct _Unwind_Context *context)
+_Unwind_ForcedUnwind_Phase2 (struct _Unwind_Exception *exc,
+                            struct _Unwind_Context *context)

 {
   _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) (_Unwind_Ptr) exc->private_1;
   void *stop_argument = (void *) (_Unwind_Ptr) exc->private_2;
 {
   _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) (_Unwind_Ptr) exc->private_1;
   void *stop_argument = (void *) (_Unwind_Ptr) exc->private_2;


@@ -144,6 +151,7 @@ _Unwind_ForcedUnwind_Phase2(struct _Unwind_Exception *exc,
       _Unwind_FrameState fs;
       int action;
 
       _Unwind_FrameState fs;
       int action;
 

+      /* Set up fs to describe the FDE for the caller of cur_context.  */

       code = uw_frame_state_for (context, &fs);
       if (code != _URC_NO_REASON && code != _URC_END_OF_STACK)
        return _URC_FATAL_PHASE2_ERROR;
       code = uw_frame_state_for (context, &fs);
       if (code != _URC_NO_REASON && code != _URC_END_OF_STACK)
        return _URC_FATAL_PHASE2_ERROR;


@@ -172,7 +180,9 @@ _Unwind_ForcedUnwind_Phase2(struct _Unwind_Exception *exc,
            return _URC_FATAL_PHASE2_ERROR;
        }
 
            return _URC_FATAL_PHASE2_ERROR;
        }
 

-      uw_update_context (context, &fs);
+      /* Update cur_context to describe the same frame as fs, and discard
+        the previous context if necessary.  */
+      uw_advance_context (context, &fs);

     }
 
   return code;
     }
 
   return code;


@@ -181,7 +191,7 @@ _Unwind_ForcedUnwind_Phase2(struct _Unwind_Exception *exc,
 
 /* Raise an exception for forced unwinding.  */
 
 
 /* Raise an exception for forced unwinding.  */
 

-_Unwind_Reason_Code
+_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE

 _Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
                      _Unwind_Stop_Fn stop, void * stop_argument)
 {
 _Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
                      _Unwind_Stop_Fn stop, void * stop_argument)
 {


@@ -205,7 +215,7 @@ _Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
 /* Resume propagation of an existing exception.  This is used after
    e.g. executing cleanup code, and not to implement rethrowing.  */
 
 /* Resume propagation of an existing exception.  This is used after
    e.g. executing cleanup code, and not to implement rethrowing.  */
 

-void
+void LIBGCC2_UNWIND_ATTRIBUTE

 _Unwind_Resume (struct _Unwind_Exception *exc)
 {
   struct _Unwind_Context this_context, cur_context;
 _Unwind_Resume (struct _Unwind_Exception *exc)
 {
   struct _Unwind_Context this_context, cur_context;


@@ -221,16 +231,77 @@ _Unwind_Resume (struct _Unwind_Exception *exc)
   else
     code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
 
   else
     code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
 

-  if (code != _URC_INSTALL_CONTEXT)
-    abort ();
+  gcc_assert (code == _URC_INSTALL_CONTEXT);
+
+  uw_install_context (&this_context, &cur_context);
+}
+
+
+/* Resume propagation of an FORCE_UNWIND exception, or to rethrow
+   a normal exception that was handled.  */
+
+_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
+_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *exc)
+{
+  struct _Unwind_Context this_context, cur_context;
+  _Unwind_Reason_Code code;
+
+  /* Choose between continuing to process _Unwind_RaiseException
+     or _Unwind_ForcedUnwind.  */
+  if (exc->private_1 == 0)
+    return _Unwind_RaiseException (exc);
+
+  uw_init_context (&this_context);
+  cur_context = this_context;
+
+  code = _Unwind_ForcedUnwind_Phase2 (exc, &cur_context);
+
+  gcc_assert (code == _URC_INSTALL_CONTEXT);

 
   uw_install_context (&this_context, &cur_context);
 }
 
 
   uw_install_context (&this_context, &cur_context);
 }
 

+

 /* A convenience function that calls the exception_cleanup field.  */
 
 void
 _Unwind_DeleteException (struct _Unwind_Exception *exc)
 {
 /* A convenience function that calls the exception_cleanup field.  */
 
 void
 _Unwind_DeleteException (struct _Unwind_Exception *exc)
 {

-  (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
+  if (exc->exception_cleanup)
+    (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
+}
+
+
+/* Perform stack backtrace through unwind data.  */
+
+_Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
+_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument)
+{
+  struct _Unwind_Context context;
+  _Unwind_Reason_Code code;
+
+  uw_init_context (&context);
+
+  while (1)
+    {
+      _Unwind_FrameState fs;
+
+      /* Set up fs to describe the FDE for the caller of context.  */
+      code = uw_frame_state_for (&context, &fs);
+      if (code != _URC_NO_REASON && code != _URC_END_OF_STACK)
+       return _URC_FATAL_PHASE1_ERROR;
+
+      /* Call trace function.  */
+      if ((*trace) (&context, trace_argument) != _URC_NO_REASON)
+       return _URC_FATAL_PHASE1_ERROR;
+
+      /* We're done at end of stack.  */       
+      if (code == _URC_END_OF_STACK)
+       break;
+
+      /* Update context to describe the same frame as fs.  */
+      uw_update_context (&context, &fs);
+    }
+
+  return code;

 }
 }