cli-interp.c

这个是LINUX下的GDB调度工具的源码

/* CLI Definitions for GDB, the GNU debugger.

   Copyright 2002, 2003 Free Software Foundation, Inc.

   This file is part of GDB.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "interps.h"
#include "wrapper.h"
#include "event-top.h"
#include "ui-out.h"
#include "cli-out.h"
#include "top.h"		/* for "execute_command" */
#include "gdb_string.h"

struct ui_out *cli_uiout;

/* These are the ui_out and the interpreter for the console interpreter. */

/* Longjmp-safe wrapper for "execute_command" */
static int do_captured_execute_command (struct ui_out *uiout, void *data);
static enum gdb_rc safe_execute_command (struct ui_out *uiout, char *command,
					 int from_tty);
struct captured_execute_command_args
{
  char *command;
  int from_tty;
};

/* These implement the cli out interpreter: */

static void *
cli_interpreter_init (void)
{
  return NULL;
}

static int
cli_interpreter_resume (void *data)
{
  struct ui_file *stream;

  /*sync_execution = 1; */

  /* gdb_setup_readline will change gdb_stdout.  If the CLI was previously
     writing to gdb_stdout, then set it to the new gdb_stdout afterwards.  */

  stream = cli_out_set_stream (cli_uiout, gdb_stdout);
  if (stream != gdb_stdout)
    {
      cli_out_set_stream (cli_uiout, stream);
      stream = NULL;
    }

  gdb_setup_readline ();

  if (stream != NULL)
    cli_out_set_stream (cli_uiout, gdb_stdout);

  return 1;
}

static int
cli_interpreter_suspend (void *data)
{
  gdb_disable_readline ();
  return 1;
}

/* Don't display the prompt if we are set quiet.  */
static int
cli_interpreter_display_prompt_p (void *data)
{
  if (interp_quiet_p (NULL))
    return 0;
  else
    return 1;
}

static int
cli_interpreter_exec (void *data, const char *command_str)
{
  int result;
  struct ui_file *old_stream;

  /* FIXME: cagney/2003-02-01: Need to const char *propogate
     safe_execute_command.  */
  char *str = strcpy (alloca (strlen (command_str) + 1), command_str);

  /* gdb_stdout could change between the time cli_uiout was initialized
     and now. Since we're probably using a different interpreter which has
     a new ui_file for gdb_stdout, use that one instead of the default.

     It is important that it gets reset everytime, since the user could
     set gdb to use a different interpreter. */
  old_stream = cli_out_set_stream (cli_uiout, gdb_stdout);
  result = safe_execute_command (cli_uiout, str, 1);
  cli_out_set_stream (cli_uiout, old_stream);
  return result;
}

static int
do_captured_execute_command (struct ui_out *uiout, void *data)
{
  struct captured_execute_command_args *args =
    (struct captured_execute_command_args *) data;
  execute_command (args->command, args->from_tty);
  return GDB_RC_OK;
}

static enum gdb_rc
safe_execute_command (struct ui_out *uiout, char *command, int from_tty)
{
  struct captured_execute_command_args args;
  args.command = command;
  args.from_tty = from_tty;
  return catch_exceptions (uiout, do_captured_execute_command, &args,
			   NULL, RETURN_MASK_ALL);
}


/* standard gdb initialization hook */
extern initialize_file_ftype _initialize_cli_interp; /* -Wmissing-prototypes */

void
_initialize_cli_interp (void)
{
  static const struct interp_procs procs = {
    cli_interpreter_init,	/* init_proc */
    cli_interpreter_resume,	/* resume_proc */
    cli_interpreter_suspend,	/* suspend_proc */
    cli_interpreter_exec,	/* exec_proc */
    cli_interpreter_display_prompt_p	/* prompt_proc_p */
  };
  struct interp *cli_interp;

  /* Create a default uiout builder for the CLI. */
  cli_uiout = cli_out_new (gdb_stdout);
  cli_interp = interp_new (INTERP_CONSOLE, NULL, cli_uiout, &procs);

  interp_add (cli_interp);
}