Introduce common/common-exceptions.[ch]

This commit moves the exception throwing and catching code
into gdb/common/.  All exception printing code remains in
gdb/exceptions.[ch].

gdb/ChangeLog:

	* common/common-exceptions.h: New file.
	* common/common-exceptions.c: Likewise.
	* Makefile.in (SFILES): Add common/common-exceptions.c.
	(HFILES_NO_SRCDIR): Add common/common-exceptions.h.
	(COMMON_OBS): Add common-exceptions.o.
	(common-exceptions.o): New rule.
	* exceptions.h (common-exceptions.h): Include.
	(gdb_setjmp.h): Do not include.
	(return_reason): Moved to common-exceptions.h.
	(enum return_reason): Likewise.
	(RETURN_MASK): Likewise.
	(typedef return_mask): Likewise.
	(enum errors): Likewise.
	(struct gdb_exception): Likewise.
	(exceptions_state_mc_init): Likewise.
	(exceptions_state_mc_action_iter): Likewise.
	(exceptions_state_mc_action_iter_1): Likewise.
	(TRY_CATCH): Likewise.
	(throw_exception): Likewise.
	(throw_verror): Likewise.
	(throw_vquit): Likewise.
	(throw_error): Likewise.
	(throw_quit): Likewise.
	* exceptions.c (enum catcher_state): Moved to common-exceptions.c.
	(enum catcher_action): Likewise.
	(struct catcher): Likewise.
	(current_catcher): Likewise.
	(catcher_list_size): Likewise.
	(exceptions_state_mc_init): Likewise.
	(catcher_pop): Likewise.
	(exceptions_state_mc): Likewise.
	(exceptions_state_mc_action_iter): Likewise.
	(exceptions_state_mc_action_iter_1): Likewise.
	(throw_exception): Likewise.
	(exception_messages): Likewise.
	(exception_messages_size): Likewise.
	(throw_it): Likewise.
	(throw_verror): Likewise.
	(throw_vquit): Likewise.
	(throw_error): Likewise.
	(throw_quit): Likewise.
	(prepare_to_throw_exception): New function.

gdb/gdbserver/ChangeLog:

	* Makefile.in (SFILES): Add common/common-exceptions.c.
	(OBS): Add common-exceptions.o.
	(common-exceptions.o): New rule.
	* utils.c (prepare_to_throw_exception): New function.

1 files changed, 1 insertions, 281 deletions

diff --git a/gdb/exceptions.c b/gdb/exceptions.c
index 48843eae75..28b8dd1bce 100644
--- a/gdb/exceptions.c
+++ b/gdb/exceptions.c
@@ -29,207 +29,11 @@
 
 const struct gdb_exception exception_none = { 0, GDB_NO_ERROR, NULL };
 
-/* Possible catcher states.  */
-enum catcher_state {
-  /* Initial state, a new catcher has just been created.  */
-  CATCHER_CREATED,
-  /* The catch code is running.  */
-  CATCHER_RUNNING,
-  CATCHER_RUNNING_1,
-  /* The catch code threw an exception.  */
-  CATCHER_ABORTING
-};
-
-/* Possible catcher actions.  */
-enum catcher_action {
-  CATCH_ITER,
-  CATCH_ITER_1,
-  CATCH_THROWING
-};
-
-struct catcher
-{
-  enum catcher_state state;
-  /* Jump buffer pointing back at the exception handler.  */
-  SIGJMP_BUF buf;
-  /* Status buffer belonging to the exception handler.  */
-  volatile struct gdb_exception *exception;
-  /* Saved/current state.  */
-  int mask;
-  struct cleanup *saved_cleanup_chain;
-  /* Back link.  */
-  struct catcher *prev;
-};
-
-/* Where to go for throw_exception().  */
-static struct catcher *current_catcher;
-
-/* Return length of current_catcher list.  */
-
-static int
-catcher_list_size (void)
-{
-  int size;
-  struct catcher *catcher;
-
-  for (size = 0, catcher = current_catcher;
-       catcher != NULL;
-       catcher = catcher->prev)
-    ++size;
-
-  return size;
-}
-
-SIGJMP_BUF *
-exceptions_state_mc_init (volatile struct gdb_exception *exception,
-			  return_mask mask)
-{
-  struct catcher *new_catcher = XCNEW (struct catcher);
-
-  /* Start with no exception, save it's address.  */
-  exception->reason = 0;
-  exception->error = GDB_NO_ERROR;
-  exception->message = NULL;
-  new_catcher->exception = exception;
-
-  new_catcher->mask = mask;
-
-  /* Prevent error/quit during FUNC from calling cleanups established
-     prior to here.  */
-  new_catcher->saved_cleanup_chain = save_cleanups ();
-
-  /* Push this new catcher on the top.  */
-  new_catcher->prev = current_catcher;
-  current_catcher = new_catcher;
-  new_catcher->state = CATCHER_CREATED;
-
-  return &new_catcher->buf;
-}
-
-static void
-catcher_pop (void)
-{
-  struct catcher *old_catcher = current_catcher;
-
-  current_catcher = old_catcher->prev;
-
-  /* Restore the cleanup chain, the error/quit messages, and the uiout
-     builder, to their original states.  */
-
-  restore_cleanups (old_catcher->saved_cleanup_chain);
-
-  xfree (old_catcher);
-}
-
-/* Catcher state machine.  Returns non-zero if the m/c should be run
-   again, zero if it should abort.  */
-
-static int
-exceptions_state_mc (enum catcher_action action)
-{
-  switch (current_catcher->state)
-    {
-    case CATCHER_CREATED:
-      switch (action)
-	{
-	case CATCH_ITER:
-	  /* Allow the code to run the catcher.  */
-	  current_catcher->state = CATCHER_RUNNING;
-	  return 1;
-	default:
-	  internal_error (__FILE__, __LINE__, _("bad state"));
-	}
-    case CATCHER_RUNNING:
-      switch (action)
-	{
-	case CATCH_ITER:
-	  /* No error/quit has occured.  Just clean up.  */
-	  catcher_pop ();
-	  return 0;
-	case CATCH_ITER_1:
-	  current_catcher->state = CATCHER_RUNNING_1;
-	  return 1;
-	case CATCH_THROWING:
-	  current_catcher->state = CATCHER_ABORTING;
-	  /* See also throw_exception.  */
-	  return 1;
-	default:
-	  internal_error (__FILE__, __LINE__, _("bad switch"));
-	}
-    case CATCHER_RUNNING_1:
-      switch (action)
-	{
-	case CATCH_ITER:
-	  /* The did a "break" from the inner while loop.  */
-	  catcher_pop ();
-	  return 0;
-	case CATCH_ITER_1:
-	  current_catcher->state = CATCHER_RUNNING;
-	  return 0;
-	case CATCH_THROWING:
-	  current_catcher->state = CATCHER_ABORTING;
-	  /* See also throw_exception.  */
-	  return 1;
-	default:
-	  internal_error (__FILE__, __LINE__, _("bad switch"));
-	}
-    case CATCHER_ABORTING:
-      switch (action)
-	{
-	case CATCH_ITER:
-	  {
-	    struct gdb_exception exception = *current_catcher->exception;
-
-	    if (current_catcher->mask & RETURN_MASK (exception.reason))
-	      {
-		/* Exit normally if this catcher can handle this
-		   exception.  The caller analyses the func return
-		   values.  */
-		catcher_pop ();
-		return 0;
-	      }
-	    /* The caller didn't request that the event be caught,
-	       relay the event to the next containing
-	       catch_errors().  */
-	    catcher_pop ();
-	    throw_exception (exception);
-	  }
-	default:
-	  internal_error (__FILE__, __LINE__, _("bad state"));
-	}
-    default:
-      internal_error (__FILE__, __LINE__, _("bad switch"));
-    }
-}
-
-int
-exceptions_state_mc_action_iter (void)
-{
-  return exceptions_state_mc (CATCH_ITER);
-}
-
-int
-exceptions_state_mc_action_iter_1 (void)
-{
-  return exceptions_state_mc (CATCH_ITER_1);
-}
-
-/* Return EXCEPTION to the nearest containing catch_errors().  */
-
 void
-throw_exception (struct gdb_exception exception)
+prepare_to_throw_exception (void)
 {
   clear_quit_flag ();
   immediate_quit = 0;
-
-  do_cleanups (all_cleanups ());
-
-  /* Jump to the containing catch_errors() call, communicating REASON
-     to that call via setjmp's return value.  Note that REASON can't
-     be zero, by definition in defs.h.  */
-  exceptions_state_mc (CATCH_THROWING);
-  *current_catcher->exception = exception;
-  SIGLONGJMP (current_catcher->buf, exception.reason);
 }
 
 static void
@@ -332,90 +136,6 @@ exception_fprintf (struct ui_file *file, struct gdb_exception e,
     }
 }
 
-/* A stack of exception messages.
-   This is needed to handle nested calls to throw_it: we don't want to
-   xfree space for a message before it's used.
-   This can happen if we throw an exception during a cleanup:
-   An outer TRY_CATCH may have an exception message it wants to print,
-   but while doing cleanups further calls to throw_it are made.
-
-   This is indexed by the size of the current_catcher list.
-   It is a dynamically allocated array so that we don't care how deeply
-   GDB nests its TRY_CATCHs.  */
-static char **exception_messages;
-
-/* The number of currently allocated entries in exception_messages.  */
-static int exception_messages_size;
-
-static void ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (3, 0)
-throw_it (enum return_reason reason, enum errors error, const char *fmt,
-	  va_list ap)
-{
-  struct gdb_exception e;
-  char *new_message;
-  int depth = catcher_list_size ();
-
-  gdb_assert (depth > 0);
-
-  /* Note: The new message may use an old message's text.  */
-  new_message = xstrvprintf (fmt, ap);
-
-  if (depth > exception_messages_size)
-    {
-      int old_size = exception_messages_size;
-
-      exception_messages_size = depth + 10;
-      exception_messages = (char **) xrealloc (exception_messages,
-					       exception_messages_size
-					       * sizeof (char *));
-      memset (exception_messages + old_size, 0,
-	      (exception_messages_size - old_size) * sizeof (char *));
-    }
-
-  xfree (exception_messages[depth - 1]);
-  exception_messages[depth - 1] = new_message;
-
-  /* Create the exception.  */
-  e.reason = reason;
-  e.error = error;
-  e.message = new_message;
-
-  /* Throw the exception.  */
-  throw_exception (e);
-}
-
-void
-throw_verror (enum errors error, const char *fmt, va_list ap)
-{
-  throw_it (RETURN_ERROR, error, fmt, ap);
-}
-
-void
-throw_vquit (const char *fmt, va_list ap)
-{
-  throw_it (RETURN_QUIT, GDB_NO_ERROR, fmt, ap);
-}
-
-void
-throw_error (enum errors error, const char *fmt, ...)
-{
-  va_list args;
-
-  va_start (args, fmt);
-  throw_verror (error, fmt, args);
-  va_end (args);
-}
-
-void
-throw_quit (const char *fmt, ...)
-{
-  va_list args;
-
-  va_start (args, fmt);
-  throw_vquit (fmt, args);
-  va_end (args);
-}
-
 /* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
    handler.  If an exception (enum return_reason) is thrown using
    throw_exception() than all cleanups installed since