IA-64 ABI Exception Handling.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@40924 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 259 insertions, 0 deletions

diff --git a/gcc/unwind-sjlj.c b/gcc/unwind-sjlj.c
new file mode 100644
index 00000000000..662968bd001
--- /dev/null
+++ b/gcc/unwind-sjlj.c
@@ -0,0 +1,259 @@
+/* DWARF2 exception handling and frame unwind runtime interface routines.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   This file is part of GNU CC.
+
+   GNU CC 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)
+   any later version.
+
+   GNU CC 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.
+
+   You should have received a copy of the GNU General Public License
+   along with GNU CC; see the file COPYING.  If not, write to
+   the Free Software Foundation, 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "tconfig.h"
+#include "tsystem.h"
+#include "unwind.h"
+#include "gthr.h"
+
+#if USING_SJLJ_EXCEPTIONS
+
+#ifdef DONT_USE_BUILTIN_SETJMP
+#include <setjmp.h>
+#else
+#define setjmp __builtin_setjmp
+#define longjmp __builtin_longjmp
+#endif
+
+/* 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 is the chain through all registered contexts.  It is
+     filled in by _Unwind_SjLj_Register.  */
+  struct SjLj_Function_Context *prev;
+
+  /* This is assigned in by the target function before every call
+     to the index of the call site in the lsda.  It is assigned by
+     the personality routine to the landing pad index.  */
+  int call_site;
+
+  /* This is how data is returned from the personality routine to
+     the target function's handler.  */
+  _Unwind_Word data[4];
+
+  /* These are filled in once by the target function before any
+     exceptions are expected to be handled.  */
+  _Unwind_Personality_Fn personality;
+  void *lsda;
+
+#ifdef DONT_USE_BUILTIN_SETJMP
+  /* We don't know what sort of alignment requirements the system
+     jmp_buf has.  We over estimated in except.c, and now we have
+     to match that here just in case the system *didn't* have more 
+     restrictive requirements.  */
+  jmp_buf jbuf __attribute__((aligned));
+#else
+  void *jbuf[];
+#endif
+};
+
+struct _Unwind_Context
+{
+  struct SjLj_Function_Context *fc;
+};
+
+typedef struct 
+{
+  _Unwind_Personality_Fn personality;
+} _Unwind_FrameState;
+
+
+/* Manage the chain of registered function contexts.  */
+
+/* Single threaded fallback chain.  */
+static struct SjLj_Function_Context *fc_static;
+
+#if __GTHREADS
+static __gthread_key_t fc_key;
+static int use_fc_key = -1;
+
+static void
+fc_key_dtor (void *ptr)
+{
+  __gthread_key_dtor (fc_key, ptr);
+}
+
+static void
+fc_key_init (void)
+{
+  use_fc_key = __gthread_key_create (&fc_key, fc_key_dtor) == 0;
+}
+
+static void
+fc_key_init_once (void)
+{
+  static __gthread_once_t once = __GTHREAD_ONCE_INIT;
+  if (__gthread_once (&once, fc_key_init) != 0 || use_fc_key < 0)
+    use_fc_key = 0;
+}
+#endif
+
+void
+_Unwind_SjLj_Register (struct SjLj_Function_Context *fc)
+{
+#if __GTHREADS
+  if (use_fc_key < 0)
+    fc_key_init_once ();
+
+  if (use_fc_key)
+    {
+      fc->prev = __gthread_getspecific (fc_key);
+      __gthread_setspecific (fc_key, fc);
+    }
+  else
+#endif
+    {
+      fc->prev = fc_static;
+      fc_static = fc;
+    }
+}
+
+static inline struct SjLj_Function_Context *
+_Unwind_SjLj_GetContext (void)
+{
+#if __GTHREADS
+  if (use_fc_key < 0)
+    fc_key_init_once ();
+
+  if (use_fc_key)
+    return __gthread_getspecific (fc_key);
+#endif
+  return fc_static;
+}
+
+static inline void
+_Unwind_SjLj_SetContext (struct SjLj_Function_Context *fc)
+{
+#if __GTHREADS
+  if (use_fc_key < 0)
+    fc_key_init_once ();
+
+  if (use_fc_key)
+    __gthread_setspecific (fc_key, fc);
+  else
+#endif
+    fc_static = fc;
+}
+
+void
+_Unwind_SjLj_Unregister (struct SjLj_Function_Context *fc)
+{
+  _Unwind_SjLj_SetContext (fc->prev);
+}
+
+
+/* Get/set the return data value at INDEX in CONTEXT.  */
+
+_Unwind_Word
+_Unwind_GetGR (struct _Unwind_Context *context, int index)
+{
+  return context->fc->data[index];
+}
+
+void
+_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
+{
+  context->fc->data[index] = val;
+}
+
+/* Get the call-site index as saved in CONTEXT.  */
+
+_Unwind_Ptr
+_Unwind_GetIP (struct _Unwind_Context *context)
+{
+  return context->fc->call_site + 1;
+}
+
+/* Set the return landing pad index in CONTEXT.  */
+
+void
+_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
+{
+  context->fc->call_site = val - 1;
+}
+
+void *
+_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
+{
+  return context->fc->lsda;
+}
+
+_Unwind_Ptr
+_Unwind_GetRegionStart (struct _Unwind_Context *context)
+{
+  return 0;
+}
+
+
+static inline _Unwind_Reason_Code
+uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+  if (context->fc == NULL)
+    {
+      fs->personality = NULL;
+      return _URC_END_OF_STACK;
+    }
+  else
+    {
+      fs->personality = context->fc->personality;
+      return _URC_NO_REASON;
+    }
+}
+
+static inline void
+uw_update_context (struct _Unwind_Context *context,
+		   _Unwind_FrameState *fs __attribute__((unused)) )
+{
+  context->fc = context->fc->prev;
+}
+
+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 inline _Unwind_Ptr
+uw_identify_context (struct _Unwind_Context *context)
+{
+  return (_Unwind_Ptr) context->fc;
+}
+
+
+/* Play games with unwind symbols so that we can have call frame
+   and sjlj symbols in the same shared library.  Not that you can
+   use them simultaneously...  */
+#define _Unwind_RaiseException		_Unwind_SjLj_RaiseException
+#define _Unwind_ForcedUnwind		_Unwind_SjLj_ForcedUnwind
+#define _Unwind_Resume			_Unwind_SjLj_Resume
+
+#include "unwind.inc"
+
+#endif /* USING_SJLJ_EXCEPTIONS */