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
to the one extracted from the above tarball.

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, 497 insertions, 0 deletions

diff --git a/libjava/exception.cc b/libjava/exception.cc
new file mode 100644
index 000000000..76f145112
--- /dev/null
+++ b/libjava/exception.cc
@@ -0,0 +1,497 @@
+// Functions for Exception Support for Java.
+
+/* Copyright (C) 1998, 1999, 2001, 2002, 2006, 2010  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#include <config.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+
+#include <java/lang/Class.h>
+#include <java/lang/NullPointerException.h>
+#include <gnu/gcj/RawData.h> 
+#include <gcj/cni.h>
+#include <jvm.h>
+
+// unwind-pe.h uses std::abort(), but sometimes we compile libjava
+// without libstdc++-v3. The following hack forces it to use
+// stdlib.h's abort().
+namespace std
+{
+  static __attribute__ ((__noreturn__)) void
+  abort ()
+  {
+    ::abort ();
+  }
+}
+#include "unwind.h"
+
+struct alignment_test_struct
+{
+  char space;
+  char end[0] __attribute__((aligned));
+};
+
+struct java_exception_header
+{
+  /* Cache handler details between Phase 1 and Phase 2.  */
+  _Unwind_Ptr landingPad;
+  int handlerSwitchValue;
+
+  /* The object being thrown.  Compiled code expects this to be immediately
+     before the generic exception header.  Which is complicated by the fact
+     that _Unwind_Exception is ((aligned)).  */
+
+  char pad[sizeof(jthrowable) < sizeof(alignment_test_struct)
+	   ? sizeof(alignment_test_struct) - sizeof(jthrowable) : 0]
+    __attribute__((aligned));
+
+  jthrowable value;
+
+  /* The generic exception header.  */
+  _Unwind_Exception unwindHeader;
+};
+
+#ifdef __ARM_EABI_UNWINDER__
+// This is the exception class we report -- "GNUCJAVA".
+
+const _Unwind_Exception_Class __gcj_exception_class
+  = {'G', 'N', 'U', 'C', 'J', 'A', 'V', 'A'};
+
+static inline java_exception_header *
+get_exception_header_from_ue (_Unwind_Exception *exc)
+{
+  return reinterpret_cast<java_exception_header *>(exc + 1) - 1;
+}
+
+extern "C" void __cxa_begin_cleanup (_Unwind_Exception*);
+
+#else // !__ARM_EABI_UNWINDER__
+// This is the exception class we report -- "GNUCJAVA".
+const _Unwind_Exception_Class __gcj_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) 'J')
+     << 8 | (_Unwind_Exception_Class) 'A')
+    << 8 | (_Unwind_Exception_Class) 'V')
+   << 8 | (_Unwind_Exception_Class) 'A');
+
+
+static inline java_exception_header *
+get_exception_header_from_ue (_Unwind_Exception *exc)
+{
+  return reinterpret_cast<java_exception_header *>(exc + 1) - 1;
+}
+#endif // !__ARM_EABI_UNWINDER__
+
+/* Perform a throw, Java style. Throw will unwind through this call,
+   so there better not be any handlers or exception thrown here. */
+
+extern "C" void
+_Jv_Throw (jthrowable value)
+{
+  java_exception_header *xh
+    = static_cast<java_exception_header *>(_Jv_AllocRawObj (sizeof (*xh)));
+
+  if (value == NULL)
+    value = new java::lang::NullPointerException ();
+  xh->value = value;
+
+  memcpy (&xh->unwindHeader.exception_class, &__gcj_exception_class,
+	  sizeof xh->unwindHeader.exception_class);
+  xh->unwindHeader.exception_cleanup = NULL;
+
+  /* We're happy with setjmp/longjmp exceptions or region-based
+     exception handlers: entry points are provided here for both.  */
+#ifdef SJLJ_EXCEPTIONS
+  _Unwind_SjLj_RaiseException (&xh->unwindHeader);
+#else
+  _Unwind_RaiseException (&xh->unwindHeader);
+#endif
+
+  /* If code == _URC_END_OF_STACK, then we reached top of stack without
+     finding a handler for the exception.  Since each thread is run in
+     a try/catch, this oughtn't happen.  If code is something else, we
+     encountered some sort of heinous lossage from which we could not
+     recover.  As is the way of such things, almost certainly we will have
+     crashed before now, rather than actually being able to diagnose the
+     problem.  */
+  abort();
+}
+
+
+#include "unwind-pe.h"
+
+struct lsda_header_info
+{
+  _Unwind_Ptr Start;
+  _Unwind_Ptr LPStart;
+  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 (_Unwind_Context *context, const unsigned char *p,
+		   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 void **
+get_ttype_entry(_Unwind_Context *, lsda_header_info* info, _uleb128_t i)
+{
+  _Unwind_Ptr ptr;
+
+  ptr = (_Unwind_Ptr) (info->TType - (i * 4));
+  ptr = _Unwind_decode_target2(ptr);
+  
+  return reinterpret_cast<void **>(ptr);
+}
+
+#else
+
+static void **
+get_ttype_entry (_Unwind_Context *context, lsda_header_info *info, long i)
+{
+  _Unwind_Ptr ptr;
+
+  i *= size_of_encoded_value (info->ttype_encoding);
+  read_encoded_value (context, info->ttype_encoding, info->TType - i, &ptr);
+
+  return reinterpret_cast<void **>(ptr);
+}
+
+#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	__gcj_personality_sj0
+#define __builtin_eh_return_data_regno(x) x
+#else
+#define PERSONALITY_FUNCTION	__gcj_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)
+
+extern "C" _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
+
+extern "C" _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
+{
+  java_exception_header *xh = get_exception_header_from_ue (ue_header);
+
+  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;
+  bool saw_cleanup;
+  bool saw_handler;
+  bool foreign_exception;
+  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:
+      std::abort();
+    }
+  actions |= state & _US_FORCE_UNWIND;
+
+  // We don't know which runtime we're working with, so can't check this.
+  // However the ABI routines hide this from us, and we don't actually need
+  // to know.
+  foreign_exception = false;
+
+  // 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
+  // Interface version check.
+  if (version != 1)
+    return _URC_FATAL_PHASE1_ERROR;
+  foreign_exception = exception_class != __gcj_exception_class;
+#endif
+
+  // Shortcut for phase 2 found handler for domestic exception.
+  if (actions == (_UA_CLEANUP_PHASE | _UA_HANDLER_FRAME)
+      && !foreign_exception)
+    {
+      handler_switch_value = xh->handlerSwitchValue;
+      landing_pad = xh->landingPad;
+      goto install_context;
+    }
+
+  // FIXME: In Phase 1, record _Unwind_GetIPInfo in xh->obj as a part of
+  // the stack trace for this exception.  This will only collect Java
+  // frames, but perhaps that is acceptable.
+  // FIXME2: _Unwind_GetIPInfo is nonsensical for SJLJ, being a call-site
+  // index instead of a PC value.  We could perhaps arrange for
+  // _Unwind_GetRegionStart to return context->fc->jbuf[1], which
+  // is the address of the handler label for __builtin_longjmp, but
+  // there is no solution for DONT_USE_BUILTIN_SETJMP.
+
+  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);
+#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.
+  // ??? It is perhaps better to tweek the LSDA so that no-action
+  // is mapped to no-entry for Java.
+  CONTINUE_UNWINDING;
+
+ found_something:
+  saw_cleanup = false;
+  saw_handler = false;
+
+  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 = true;
+    }
+  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 = true;
+	    }
+
+	  // 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.
+
+	      void **catch_word = get_ttype_entry (context, &info, ar_filter);
+	      jclass catch_type = (jclass)*catch_word;
+
+	      // FIXME: This line is a kludge to work around exception
+	      // handlers written in C++, which don't yet use indirect
+	      // dispatch.
+	      if (catch_type == *(void **)&java::lang::Class::class$)
+		catch_type = (jclass)catch_word;
+
+	      if (_Jv_IsInstanceOf (xh->value, catch_type))
+		{
+		  handler_switch_value = ar_filter;
+		  saw_handler = true;
+		  break;
+		}
+	    }
+	  else
+	    {
+	      // Negative filter values are exception specifications,
+	      // which Java does not use.
+	      // ??? Perhaps better to make them an index into a table
+	      // of null-terminated strings instead of playing games
+	      // with Utf8Const+1 as above.
+	      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)
+        {
+          xh->handlerSwitchValue = handler_switch_value;
+          xh->landingPad = landing_pad;
+	}
+      return _URC_HANDLER_FOUND;
+    }
+
+ install_context:
+  _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
+		 (_Unwind_Ptr) &xh->unwindHeader);
+  _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
+		 handler_switch_value);
+  _Unwind_SetIP (context, landing_pad);
+#ifdef __ARM_EABI_UNWINDER__
+  if (saw_cleanup)
+    __cxa_begin_cleanup(ue_header);
+#endif
+  return _URC_INSTALL_CONTEXT;
+}