487 lines
13 KiB
C
487 lines
13 KiB
C
/* Manages interpreters for GDB, the GNU debugger.
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Copyright 2000, 2002, 2003 Free Software Foundation, Inc.
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Written by Jim Ingham <jingham@apple.com> of Apple Computer, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This is just a first cut at separating out the "interpreter"
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functions of gdb into self-contained modules. There are a couple
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of open areas that need to be sorted out:
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1) The interpreter explicitly contains a UI_OUT, and can insert itself
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into the event loop, but it doesn't explicitly contain hooks for readline.
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I did this because it seems to me many interpreters won't want to use
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the readline command interface, and it is probably simpler to just let
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them take over the input in their resume proc. */
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#include "defs.h"
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#include "gdbcmd.h"
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#include "ui-out.h"
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#include "event-loop.h"
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#include "event-top.h"
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#include "interps.h"
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#include "completer.h"
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#include "gdb_string.h"
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#include "gdb-events.h"
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#include "gdb_assert.h"
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#include "top.h" /* For command_loop. */
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struct interp
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{
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/* This is the name in "-i=" and set interpreter. */
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const char *name;
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/* Interpreters are stored in a linked list, this is the next
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one... */
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struct interp *next;
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/* This is a cookie that an instance of the interpreter can use.
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This is a bit confused right now as the exact initialization
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sequence for it, and how it relates to the interpreter's uiout
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object is a bit confused. */
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void *data;
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/* Has the init_proc been run? */
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int inited;
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/* This is the ui_out used to collect results for this interpreter.
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It can be a formatter for stdout, as is the case for the console
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& mi outputs, or it might be a result formatter. */
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struct ui_out *interpreter_out;
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const struct interp_procs *procs;
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int quiet_p;
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};
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/* Functions local to this file. */
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static void initialize_interps (void);
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static char **interpreter_completer (char *text, char *word);
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/* The magic initialization routine for this module. */
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void _initialize_interpreter (void);
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/* Variables local to this file: */
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static struct interp *interp_list = NULL;
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static struct interp *current_interpreter = NULL;
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static int interpreter_initialized = 0;
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/* interp_new - This allocates space for a new interpreter,
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fills the fields from the inputs, and returns a pointer to the
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interpreter. */
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struct interp *
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interp_new (const char *name, void *data, struct ui_out *uiout,
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const struct interp_procs *procs)
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{
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struct interp *new_interp;
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new_interp = XMALLOC (struct interp);
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new_interp->name = xstrdup (name);
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new_interp->data = data;
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new_interp->interpreter_out = uiout;
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new_interp->quiet_p = 0;
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new_interp->procs = procs;
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new_interp->inited = 0;
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return new_interp;
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}
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/* Add interpreter INTERP to the gdb interpreter list. The
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interpreter must not have previously been added. */
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void
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interp_add (struct interp *interp)
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{
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if (!interpreter_initialized)
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initialize_interps ();
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gdb_assert (interp_lookup (interp->name) == NULL);
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interp->next = interp_list;
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interp_list = interp;
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}
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/* This sets the current interpreter to be INTERP. If INTERP has not
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been initialized, then this will also run the init proc. If the
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init proc is successful, return 1, if it fails, set the old
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interpreter back in place and return 0. If we can't restore the
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old interpreter, then raise an internal error, since we are in
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pretty bad shape at this point. */
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int
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interp_set (struct interp *interp)
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{
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struct interp *old_interp = current_interpreter;
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int first_time = 0;
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char buffer[64];
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if (current_interpreter != NULL)
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{
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do_all_continuations ();
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ui_out_flush (uiout);
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if (current_interpreter->procs->suspend_proc
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&& !current_interpreter->procs->suspend_proc (current_interpreter->
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data))
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{
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error ("Could not suspend interpreter \"%s\"\n",
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current_interpreter->name);
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}
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}
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else
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{
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first_time = 1;
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}
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current_interpreter = interp;
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/* We use interpreter_p for the "set interpreter" variable, so we need
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to make sure we have a malloc'ed copy for the set command to free. */
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if (interpreter_p != NULL
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&& strcmp (current_interpreter->name, interpreter_p) != 0)
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{
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xfree (interpreter_p);
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interpreter_p = xstrdup (current_interpreter->name);
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}
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uiout = interp->interpreter_out;
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/* Run the init proc. If it fails, try to restore the old interp. */
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if (!interp->inited)
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{
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if (interp->procs->init_proc != NULL)
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{
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interp->data = interp->procs->init_proc ();
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}
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interp->inited = 1;
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}
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/* Clear out any installed interpreter hooks/event handlers. */
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clear_interpreter_hooks ();
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if (interp->procs->resume_proc != NULL
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&& (!interp->procs->resume_proc (interp->data)))
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{
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if (old_interp == NULL || !interp_set (old_interp))
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internal_error (__FILE__, __LINE__,
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"Failed to initialize new interp \"%s\" %s",
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interp->name, "and could not restore old interp!\n");
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return 0;
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}
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/* Finally, put up the new prompt to show that we are indeed here.
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Also, display_gdb_prompt for the console does some readline magic
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which is needed for the console interpreter, at least... */
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if (!first_time)
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{
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if (!interp_quiet_p (interp))
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{
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sprintf (buffer, "Switching to interpreter \"%.24s\".\n",
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interp->name);
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ui_out_text (uiout, buffer);
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}
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display_gdb_prompt (NULL);
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}
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return 1;
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}
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/* interp_lookup - Looks up the interpreter for NAME. If no such
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interpreter exists, return NULL, otherwise return a pointer to the
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interpreter. */
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struct interp *
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interp_lookup (const char *name)
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{
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struct interp *interp;
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if (name == NULL || strlen (name) == 0)
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return NULL;
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for (interp = interp_list; interp != NULL; interp = interp->next)
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{
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if (strcmp (interp->name, name) == 0)
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return interp;
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}
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return NULL;
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}
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/* Returns the current interpreter. */
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struct ui_out *
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interp_ui_out (struct interp *interp)
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{
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if (interp != NULL)
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return interp->interpreter_out;
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return current_interpreter->interpreter_out;
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}
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/* Returns true if the current interp is the passed in name. */
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int
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current_interp_named_p (const char *interp_name)
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{
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if (current_interpreter)
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return (strcmp (current_interpreter->name, interp_name) == 0);
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return 0;
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}
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/* This is called in display_gdb_prompt. If the proc returns a zero
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value, display_gdb_prompt will return without displaying the
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prompt. */
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int
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current_interp_display_prompt_p (void)
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{
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if (current_interpreter == NULL
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|| current_interpreter->procs->prompt_proc_p == NULL)
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return 0;
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else
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return current_interpreter->procs->prompt_proc_p (current_interpreter->
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data);
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}
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/* Run the current command interpreter's main loop. */
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void
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current_interp_command_loop (void)
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{
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/* Somewhat messy. For the moment prop up all the old ways of
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selecting the command loop. `command_loop_hook' should be
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deprecated. */
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if (command_loop_hook != NULL)
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command_loop_hook ();
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else if (current_interpreter != NULL
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&& current_interpreter->procs->command_loop_proc != NULL)
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current_interpreter->procs->command_loop_proc (current_interpreter->data);
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else if (event_loop_p)
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cli_command_loop ();
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else
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command_loop ();
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}
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int
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interp_quiet_p (struct interp *interp)
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{
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if (interp != NULL)
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return interp->quiet_p;
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else
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return current_interpreter->quiet_p;
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}
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static int
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interp_set_quiet (struct interp *interp, int quiet)
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{
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int old_val = interp->quiet_p;
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interp->quiet_p = quiet;
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return old_val;
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}
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/* interp_exec - This executes COMMAND_STR in the current
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interpreter. */
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int
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interp_exec_p (struct interp *interp)
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{
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return interp->procs->exec_proc != NULL;
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}
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int
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interp_exec (struct interp *interp, const char *command_str)
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{
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if (interp->procs->exec_proc != NULL)
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{
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return interp->procs->exec_proc (interp->data, command_str);
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}
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return 0;
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}
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/* A convenience routine that nulls out all the
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common command hooks. Use it when removing your interpreter in its
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suspend proc. */
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void
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clear_interpreter_hooks (void)
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{
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init_ui_hook = 0;
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print_frame_info_listing_hook = 0;
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/*print_frame_more_info_hook = 0; */
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query_hook = 0;
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warning_hook = 0;
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create_breakpoint_hook = 0;
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delete_breakpoint_hook = 0;
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modify_breakpoint_hook = 0;
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interactive_hook = 0;
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registers_changed_hook = 0;
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readline_begin_hook = 0;
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readline_hook = 0;
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readline_end_hook = 0;
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register_changed_hook = 0;
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memory_changed_hook = 0;
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context_hook = 0;
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target_wait_hook = 0;
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call_command_hook = 0;
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error_hook = 0;
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error_begin_hook = 0;
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command_loop_hook = 0;
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clear_gdb_event_hooks ();
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}
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/* This is a lazy init routine, called the first time
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the interpreter module is used. I put it here just in case, but I haven't
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thought of a use for it yet. I will probably bag it soon, since I don't
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think it will be necessary. */
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static void
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initialize_interps (void)
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{
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interpreter_initialized = 1;
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/* Don't know if anything needs to be done here... */
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}
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static void
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interpreter_exec_cmd (char *args, int from_tty)
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{
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struct interp *old_interp, *interp_to_use;
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char **prules = NULL;
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char **trule = NULL;
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unsigned int nrules;
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unsigned int i;
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int old_quiet, use_quiet;
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prules = buildargv (args);
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if (prules == NULL)
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{
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error ("unable to parse arguments");
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}
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nrules = 0;
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if (prules != NULL)
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{
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for (trule = prules; *trule != NULL; trule++)
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{
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nrules++;
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}
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}
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if (nrules < 2)
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error ("usage: interpreter-exec <interpreter> [ <command> ... ]");
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old_interp = current_interpreter;
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interp_to_use = interp_lookup (prules[0]);
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if (interp_to_use == NULL)
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error ("Could not find interpreter \"%s\".", prules[0]);
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/* Temporarily set interpreters quiet */
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old_quiet = interp_set_quiet (old_interp, 1);
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use_quiet = interp_set_quiet (interp_to_use, 1);
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if (!interp_set (interp_to_use))
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error ("Could not switch to interpreter \"%s\".", prules[0]);
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for (i = 1; i < nrules; i++)
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{
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if (!interp_exec (interp_to_use, prules[i]))
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{
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interp_set (old_interp);
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interp_set_quiet (interp_to_use, old_quiet);
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error ("error in command: \"%s\".", prules[i]);
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break;
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}
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}
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interp_set (old_interp);
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interp_set_quiet (interp_to_use, use_quiet);
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interp_set_quiet (old_interp, old_quiet);
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}
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/* List the possible interpreters which could complete the given text. */
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static char **
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interpreter_completer (char *text, char *word)
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{
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int alloced = 0;
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int textlen;
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int num_matches;
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char **matches;
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struct interp *interp;
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/* We expect only a very limited number of interpreters, so just
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allocate room for all of them. */
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for (interp = interp_list; interp != NULL; interp = interp->next)
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++alloced;
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matches = (char **) xmalloc (alloced * sizeof (char *));
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num_matches = 0;
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textlen = strlen (text);
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for (interp = interp_list; interp != NULL; interp = interp->next)
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{
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if (strncmp (interp->name, text, textlen) == 0)
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{
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matches[num_matches] =
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(char *) xmalloc (strlen (word) + strlen (interp->name) + 1);
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if (word == text)
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strcpy (matches[num_matches], interp->name);
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else if (word > text)
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{
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/* Return some portion of interp->name */
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strcpy (matches[num_matches], interp->name + (word - text));
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}
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else
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{
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/* Return some of text plus interp->name */
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strncpy (matches[num_matches], word, text - word);
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matches[num_matches][text - word] = '\0';
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strcat (matches[num_matches], interp->name);
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}
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++num_matches;
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}
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}
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if (num_matches == 0)
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{
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xfree (matches);
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matches = NULL;
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}
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else if (num_matches < alloced)
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{
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matches = (char **) xrealloc ((char *) matches, ((num_matches + 1)
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* sizeof (char *)));
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matches[num_matches] = NULL;
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}
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return matches;
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}
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/* This just adds the "interpreter-exec" command. */
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void
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_initialize_interpreter (void)
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{
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struct cmd_list_element *c;
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c = add_cmd ("interpreter-exec", class_support,
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interpreter_exec_cmd,
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"Execute a command in an interpreter. It takes two arguments:\n\
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The first argument is the name of the interpreter to use.\n\
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The second argument is the command to execute.\n", &cmdlist);
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set_cmd_completer (c, interpreter_completer);
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}
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