obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
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if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 551 insertions, 0 deletions

diff --git a/libobjc/exception.c b/libobjc/exception.c
new file mode 100644
index 000000000..1ffb80b53
--- /dev/null
+++ b/libobjc/exception.c
@@ -0,0 +1,551 @@
+/* The implementation of exception handling primitives for Objective-C.
+   Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 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 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 WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+License for more details.
+
+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/>.  */
+
+#include "objc-private/common.h"
+#include <stdlib.h>
+#include "config.h"
+#include "objc/runtime.h"
+#include "objc/objc-exception.h"
+#include "unwind.h"
+#include "unwind-pe.h"
+#include <string.h> /* For memcpy */
+
+/* This hook allows libraries to sepecify special actions when an
+   exception is thrown without a handler in place.  This is deprecated
+   in favour of objc_set_uncaught_exception_handler ().  */
+void (*_objc_unexpected_exception) (id exception); /* !T:SAFE */
+
+
+/* 'is_kind_of_exception_matcher' is our default exception matcher -
+   it determines if the object 'exception' is of class 'catch_class',
+   or of a subclass.  */
+static int
+is_kind_of_exception_matcher (Class catch_class, id exception)
+{
+  /* NULL catch_class is catch-all (eg, @catch (id object)).  */
+  if (catch_class == Nil)
+    return 1;
+
+  /* If exception is nil (eg, @throw nil;), then it can only be
+     catched by a catch-all (eg, @catch (id object)).  */
+  if (exception != nil)
+    {
+      Class c;
+
+      for (c = exception->class_pointer; c != Nil; 
+	   c = class_getSuperclass (c))
+	if (c == catch_class)
+	  return 1;
+    }
+  return 0;
+}
+
+/* The exception matcher currently in use.  */
+static objc_exception_matcher
+__objc_exception_matcher = is_kind_of_exception_matcher;
+
+objc_exception_matcher
+objc_setExceptionMatcher (objc_exception_matcher new_matcher)
+{
+  objc_exception_matcher old_matcher = __objc_exception_matcher;
+  __objc_exception_matcher = new_matcher;
+  return old_matcher;
+}
+
+/* The uncaught exception handler currently in use.  */
+static objc_uncaught_exception_handler
+__objc_uncaught_exception_handler = NULL;
+
+objc_uncaught_exception_handler
+objc_setUncaughtExceptionHandler (objc_uncaught_exception_handler 
+				  new_handler)
+{
+  objc_uncaught_exception_handler old_handler 
+    = __objc_uncaught_exception_handler;
+  __objc_uncaught_exception_handler = new_handler;
+  return old_handler;
+}
+
+
+
+#ifdef __ARM_EABI_UNWINDER__
+
+const _Unwind_Exception_Class __objc_exception_class
+  = {'G', 'N', 'U', 'C', 'O', 'B', 'J', 'C'};
+  
+#else
+
+/* This is the exception class we report -- "GNUCOBJC".  */
+static const _Unwind_Exception_Class __objc_exception_class
+  = ((((((((_Unwind_Exception_Class) 'G'
+            << 8 | (_Unwind_Exception_Class) 'N')
+           << 8 | (_Unwind_Exception_Class) 'U')
+          << 8 | (_Unwind_Exception_Class) 'C')
+         << 8 | (_Unwind_Exception_Class) 'O')
+        << 8 | (_Unwind_Exception_Class) 'B')
+       << 8 | (_Unwind_Exception_Class) 'J')
+      << 8 | (_Unwind_Exception_Class) 'C');
+
+#endif
+
+/* This is the object that is passed around by the Objective C runtime
+   to represent the exception in flight.  */
+struct ObjcException
+{
+  /* This bit is needed in order to interact with the unwind runtime.  */
+  struct _Unwind_Exception base;
+
+  /* The actual object we want to throw. Note: must come immediately
+     after unwind header.  */
+  id value;
+
+#ifdef __ARM_EABI_UNWINDER__
+  /* Note: we use the barrier cache defined in the unwind control
+     block for ARM EABI.  */
+#else
+  /* Cache some internal unwind data between phase 1 and phase 2.  */
+  _Unwind_Ptr landingPad;
+  int handlerSwitchValue;
+#endif
+};
+
+
+
+struct lsda_header_info
+{
+  _Unwind_Ptr Start;
+  _Unwind_Ptr LPStart;
+  _Unwind_Ptr ttype_base;
+  const unsigned char *TType;
+  const unsigned char *action_table;
+  unsigned char ttype_encoding;
+  unsigned char call_site_encoding;
+};
+
+static const unsigned char *
+parse_lsda_header (struct _Unwind_Context *context, const unsigned char *p,
+		   struct lsda_header_info *info)
+{
+  _uleb128_t tmp;
+  unsigned char lpstart_encoding;
+
+  info->Start = (context ? _Unwind_GetRegionStart (context) : 0);
+
+  /* Find @LPStart, the base to which landing pad offsets are
+     relative.  */
+  lpstart_encoding = *p++;
+  if (lpstart_encoding != DW_EH_PE_omit)
+    p = read_encoded_value (context, lpstart_encoding, p, &info->LPStart);
+  else
+    info->LPStart = info->Start;
+
+  /* Find @TType, the base of the handler and exception spec type
+     data.  */
+  info->ttype_encoding = *p++;
+  if (info->ttype_encoding != DW_EH_PE_omit)
+    {
+      p = read_uleb128 (p, &tmp);
+      info->TType = p + tmp;
+    }
+  else
+    info->TType = 0;
+
+  /* The encoding and length of the call-site table; the action table
+     immediately follows.  */
+  info->call_site_encoding = *p++;
+  p = read_uleb128 (p, &tmp);
+  info->action_table = p + tmp;
+
+  return p;
+}
+
+#ifdef __ARM_EABI_UNWINDER__
+
+static Class
+get_ttype_entry (struct lsda_header_info *info, _uleb128_t i)
+{
+  _Unwind_Ptr ptr;
+  
+  ptr = (_Unwind_Ptr) (info->TType - (i * 4));
+  ptr = _Unwind_decode_target2 (ptr);
+
+  /* NULL ptr means catch-all.  Note that if the class is not found,
+     this will abort the program.  */
+  if (ptr)
+    return objc_getRequiredClass ((const char *) ptr);
+  else
+    return 0;
+}
+
+#else
+
+static Class
+get_ttype_entry (struct lsda_header_info *info, _Unwind_Word i)
+{
+  _Unwind_Ptr ptr;
+
+  i *= size_of_encoded_value (info->ttype_encoding);
+  read_encoded_value_with_base (info->ttype_encoding, info->ttype_base,
+				info->TType - i, &ptr);
+
+  /* NULL ptr means catch-all.  Note that if the class is not found,
+     this will abort the program.  */
+  if (ptr)
+    return objc_getRequiredClass ((const char *) ptr);
+  else
+    return 0;
+}
+
+#endif
+
+/* Using a different personality function name causes link failures
+   when trying to mix code using different exception handling
+   models.  */
+#ifdef SJLJ_EXCEPTIONS
+#define PERSONALITY_FUNCTION	__gnu_objc_personality_sj0
+#define __builtin_eh_return_data_regno(x) x
+#else
+#define PERSONALITY_FUNCTION	__gnu_objc_personality_v0
+#endif
+
+#ifdef __ARM_EABI_UNWINDER__
+
+#define CONTINUE_UNWINDING \
+  do								\
+    {								\
+      if (__gnu_unwind_frame(ue_header, context) != _URC_OK)	\
+	return _URC_FAILURE;					\
+      return _URC_CONTINUE_UNWIND;				\
+    }								\
+  while (0)
+
+_Unwind_Reason_Code
+PERSONALITY_FUNCTION (_Unwind_State state,
+		      struct _Unwind_Exception *ue_header,
+		      struct _Unwind_Context *context)
+#else
+
+#define CONTINUE_UNWINDING return _URC_CONTINUE_UNWIND
+
+_Unwind_Reason_Code
+PERSONALITY_FUNCTION (int version,
+		      _Unwind_Action actions,
+		      _Unwind_Exception_Class exception_class,
+		      struct _Unwind_Exception *ue_header,
+		      struct _Unwind_Context *context)
+#endif
+{
+  struct ObjcException *xh = (struct ObjcException *) ue_header;
+
+  struct lsda_header_info info;
+  const unsigned char *language_specific_data;
+  const unsigned char *action_record;
+  const unsigned char *p;
+  _Unwind_Ptr landing_pad, ip;
+  int handler_switch_value;
+  int saw_cleanup = 0, saw_handler, foreign_exception;
+  void *return_object;
+  int ip_before_insn = 0;
+
+#ifdef __ARM_EABI_UNWINDER__
+  _Unwind_Action actions;
+  
+  switch (state & _US_ACTION_MASK)
+    {
+    case _US_VIRTUAL_UNWIND_FRAME:
+      actions = _UA_SEARCH_PHASE;
+      break;
+
+    case _US_UNWIND_FRAME_STARTING:
+      actions = _UA_CLEANUP_PHASE;
+      if (!(state & _US_FORCE_UNWIND)
+	  && ue_header->barrier_cache.sp == _Unwind_GetGR (context, 13))
+	actions |= _UA_HANDLER_FRAME;
+      break;
+
+    case _US_UNWIND_FRAME_RESUME:
+      CONTINUE_UNWINDING;
+      break;
+
+    default:
+      abort();
+    }
+  actions |= state & _US_FORCE_UNWIND;
+
+  /* TODO: Foreign exceptions need some attention (e.g. rethrowing
+     doesn't work).  */
+  foreign_exception = 0;
+
+  /* The dwarf unwinder assumes the context structure holds things
+     like the function and LSDA pointers.  The ARM implementation
+     caches these in the exception header (UCB).  To avoid rewriting
+     everything we make the virtual IP register point at the UCB.  */
+  ip = (_Unwind_Ptr) ue_header;
+  _Unwind_SetGR (context, 12, ip);
+
+#else  /* !__ARM_EABI_UNWINDER.  */
+  /* Interface version check.  */
+  if (version != 1)
+    return _URC_FATAL_PHASE1_ERROR;
+  
+  foreign_exception = (exception_class != __objc_exception_class);
+#endif
+
+  /* Shortcut for phase 2 found handler for domestic exception.  */
+  if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
+      && !foreign_exception)
+    {
+#ifdef __ARM_EABI_UNWINDER__
+      handler_switch_value = (int) ue_header->barrier_cache.bitpattern[1];
+      landing_pad = (_Unwind_Ptr) ue_header->barrier_cache.bitpattern[3];
+#else
+      handler_switch_value = xh->handlerSwitchValue;
+      landing_pad = xh->landingPad;
+#endif
+      goto install_context;
+    }
+
+  language_specific_data = (const unsigned char *)
+    _Unwind_GetLanguageSpecificData (context);
+
+  /* If no LSDA, then there are no handlers or cleanups.  */
+  if (! language_specific_data)
+    CONTINUE_UNWINDING;
+
+  /* Parse the LSDA header.  */
+  p = parse_lsda_header (context, language_specific_data, &info);
+  info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
+#ifdef HAVE_GETIPINFO
+  ip = _Unwind_GetIPInfo (context, &ip_before_insn);
+#else
+  ip = _Unwind_GetIP (context);
+#endif
+  if (!ip_before_insn)
+    --ip;
+  landing_pad = 0;
+  action_record = 0;
+  handler_switch_value = 0;
+
+#ifdef SJLJ_EXCEPTIONS
+  /* The given "IP" is an index into the call-site table, with two
+     exceptions -- -1 means no-action, and 0 means terminate.  But
+     since we're using uleb128 values, we've not got random access to
+     the array.  */
+  if ((int) ip < 0)
+    return _URC_CONTINUE_UNWIND;
+  else
+    {
+      _uleb128_t cs_lp, cs_action;
+      do
+	{
+	  p = read_uleb128 (p, &cs_lp);
+	  p = read_uleb128 (p, &cs_action);
+	}
+      while (--ip);
+
+      /* Can never have null landing pad for sjlj -- that would have
+         been indicated by a -1 call site index.  */
+      landing_pad = cs_lp + 1;
+      if (cs_action)
+	action_record = info.action_table + cs_action - 1;
+      goto found_something;
+    }
+#else
+  /* Search the call-site table for the action associated with this
+     IP.  */
+  while (p < info.action_table)
+    {
+      _Unwind_Ptr cs_start, cs_len, cs_lp;
+      _uleb128_t cs_action;
+
+      /* Note that all call-site encodings are "absolute"
+	 displacements.  */
+      p = read_encoded_value (0, info.call_site_encoding, p, &cs_start);
+      p = read_encoded_value (0, info.call_site_encoding, p, &cs_len);
+      p = read_encoded_value (0, info.call_site_encoding, p, &cs_lp);
+      p = read_uleb128 (p, &cs_action);
+
+      /* The table is sorted, so if we've passed the ip, stop.  */
+      if (ip < info.Start + cs_start)
+	p = info.action_table;
+      else if (ip < info.Start + cs_start + cs_len)
+	{
+	  if (cs_lp)
+	    landing_pad = info.LPStart + cs_lp;
+	  if (cs_action)
+	    action_record = info.action_table + cs_action - 1;
+	  goto found_something;
+	}
+    }
+#endif /* SJLJ_EXCEPTIONS  */
+
+  /* If ip is not present in the table, C++ would call terminate.  */
+  /* ??? As with Java, it's perhaps better to tweek the LSDA to that
+     no-action is mapped to no-entry.  */
+  CONTINUE_UNWINDING;
+
+ found_something:
+  saw_cleanup = 0;
+  saw_handler = 0;
+
+  if (landing_pad == 0)
+    {
+      /* If ip is present, and has a null landing pad, there are no
+	 cleanups or handlers to be run.  */
+    }
+  else if (action_record == 0)
+    {
+      /* If ip is present, has a non-null landing pad, and a null
+         action table offset, then there are only cleanups present.
+         Cleanups use a zero switch value, as set above.  */
+      saw_cleanup = 1;
+    }
+  else
+    {
+      /* Otherwise we have a catch handler.  */
+      _sleb128_t ar_filter, ar_disp;
+
+      while (1)
+	{
+	  p = action_record;
+	  p = read_sleb128 (p, &ar_filter);
+	  read_sleb128 (p, &ar_disp);
+
+	  if (ar_filter == 0)
+	    {
+	      /* Zero filter values are cleanups.  */
+	      saw_cleanup = 1;
+	    }
+
+	  /* During forced unwinding, we only run cleanups.  With a
+	     foreign exception class, we have no class info to
+	     match.  */
+	  else if ((actions & _UA_FORCE_UNWIND) || foreign_exception)
+	    ;
+
+	  else if (ar_filter > 0)
+	    {
+	      /* Positive filter values are handlers.  */
+	      Class catch_type = get_ttype_entry (&info, ar_filter);
+
+	      if ((*__objc_exception_matcher) (catch_type, xh->value))
+		{
+		  handler_switch_value = ar_filter;
+		  saw_handler = 1;
+		  break;
+		}
+	    }
+	  else
+	    {
+	      /* Negative filter values are exception specifications,
+	         which Objective-C does not use.  */
+	      abort ();
+	    }
+
+	  if (ar_disp == 0)
+	    break;
+	  action_record = p + ar_disp;
+	}
+    }
+
+  if (! saw_handler && ! saw_cleanup)
+    CONTINUE_UNWINDING;
+
+  if (actions & _UA_SEARCH_PHASE)
+    {
+      if (!saw_handler)
+	CONTINUE_UNWINDING;
+
+      /* For domestic exceptions, we cache data from phase 1 for phase
+	 2.  */
+      if (!foreign_exception)
+        {
+#ifdef __ARM_EABI_UNWINDER__
+	  ue_header->barrier_cache.sp = _Unwind_GetGR (context, 13);
+	  ue_header->barrier_cache.bitpattern[1] = (_uw) handler_switch_value;
+	  ue_header->barrier_cache.bitpattern[3] = (_uw) landing_pad;
+#else
+          xh->handlerSwitchValue = handler_switch_value;
+          xh->landingPad = landing_pad;
+#endif
+	}
+      return _URC_HANDLER_FOUND;
+    }
+
+ install_context:
+  if (saw_cleanup == 0)
+    {
+      return_object = xh->value;
+      if (!(actions & _UA_SEARCH_PHASE))
+	_Unwind_DeleteException(&xh->base);
+    }
+  
+  _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
+		 __builtin_extend_pointer (saw_cleanup ? xh : return_object));
+  _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
+		 handler_switch_value);
+  _Unwind_SetIP (context, landing_pad);
+  return _URC_INSTALL_CONTEXT;
+}
+
+static void
+__objc_exception_cleanup (_Unwind_Reason_Code code __attribute__((unused)),
+			  struct _Unwind_Exception *exc)
+{
+  free (exc);
+}
+
+void
+objc_exception_throw (id exception)
+{
+  struct ObjcException *header = calloc (1, sizeof (*header));
+
+  memcpy (&header->base.exception_class, &__objc_exception_class,
+	  sizeof (__objc_exception_class));
+  header->base.exception_cleanup = __objc_exception_cleanup;
+  header->value = exception;
+
+#ifdef SJLJ_EXCEPTIONS
+  _Unwind_SjLj_RaiseException (&header->base);
+#else
+  _Unwind_RaiseException (&header->base);
+#endif
+
+  /* No exception handler was installed.  Call the uncaught exception
+     handler if any is defined.  */
+  if (__objc_uncaught_exception_handler != 0)
+    {
+      (*__objc_uncaught_exception_handler) (exception);
+    }
+
+  /* As a last resort support the old, deprecated way of setting an
+     uncaught exception handler.  */
+  if (_objc_unexpected_exception != 0)
+    {
+      (*_objc_unexpected_exception) (exception);
+    }
+
+  abort ();
+}
+