1 /* Manages interpreters for GDB, the GNU debugger.
3 Copyright (C) 2000-2014 Free Software Foundation, Inc.
5 Written by Jim Ingham <jingham@apple.com> of Apple Computer, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* This is just a first cut at separating out the "interpreter"
23 functions of gdb into self-contained modules. There are a couple
24 of open areas that need to be sorted out:
26 1) The interpreter explicitly contains a UI_OUT, and can insert itself
27 into the event loop, but it doesn't explicitly contain hooks for readline.
28 I did this because it seems to me many interpreters won't want to use
29 the readline command interface, and it is probably simpler to just let
30 them take over the input in their resume proc. */
35 #include "event-loop.h"
36 #include "event-top.h"
38 #include "completer.h"
40 #include "gdb_assert.h"
41 #include "top.h" /* For command_loop. */
42 #include "exceptions.h"
43 #include "continuations.h"
45 /* True if the current interpreter in is async mode. See interps.h
46 for more details. This starts out disabled, until all the explicit
47 command line arguments (e.g., `gdb -ex "start" -ex "next"') are
49 int interpreter_async = 0;
53 /* This is the name in "-i=" and set interpreter. */
56 /* Interpreters are stored in a linked list, this is the next
60 /* This is a cookie that an instance of the interpreter can use.
61 This is a bit confused right now as the exact initialization
62 sequence for it, and how it relates to the interpreter's uiout
63 object is a bit confused. */
66 /* Has the init_proc been run? */
69 const struct interp_procs *procs;
73 /* The magic initialization routine for this module. */
75 void _initialize_interpreter (void);
77 /* Variables local to this file: */
79 static struct interp *interp_list = NULL;
80 static struct interp *current_interpreter = NULL;
81 static struct interp *top_level_interpreter_ptr = NULL;
83 /* interp_new - This allocates space for a new interpreter,
84 fills the fields from the inputs, and returns a pointer to the
87 interp_new (const char *name, const struct interp_procs *procs)
89 struct interp *new_interp;
91 new_interp = XNEW (struct interp);
93 new_interp->name = xstrdup (name);
94 new_interp->data = NULL;
95 new_interp->quiet_p = 0;
96 new_interp->procs = procs;
97 new_interp->inited = 0;
99 /* Check for required procs. */
100 gdb_assert (procs->command_loop_proc != NULL);
105 /* Add interpreter INTERP to the gdb interpreter list. The
106 interpreter must not have previously been added. */
108 interp_add (struct interp *interp)
110 gdb_assert (interp_lookup (interp->name) == NULL);
112 interp->next = interp_list;
113 interp_list = interp;
116 /* This sets the current interpreter to be INTERP. If INTERP has not
117 been initialized, then this will also run the init proc. If the
118 init proc is successful, return 1, if it fails, set the old
119 interpreter back in place and return 0. If we can't restore the
120 old interpreter, then raise an internal error, since we are in
121 pretty bad shape at this point.
123 The TOP_LEVEL parameter tells if this new interpreter is
124 the top-level one. The top-level is what is requested
125 on the command line, and is responsible for reporting general
126 notification about target state changes. For example, if
127 MI is the top-level interpreter, then it will always report
128 events such as target stops and new thread creation, even if they
129 are caused by CLI commands. */
131 interp_set (struct interp *interp, int top_level)
133 struct interp *old_interp = current_interpreter;
137 /* If we already have an interpreter, then trying to
138 set top level interpreter is kinda pointless. */
139 gdb_assert (!top_level || !current_interpreter);
140 gdb_assert (!top_level || !top_level_interpreter_ptr);
142 if (current_interpreter != NULL)
144 ui_out_flush (current_uiout);
145 if (current_interpreter->procs->suspend_proc
146 && !current_interpreter->procs->suspend_proc (current_interpreter->
149 error (_("Could not suspend interpreter \"%s\"."),
150 current_interpreter->name);
158 current_interpreter = interp;
160 top_level_interpreter_ptr = interp;
162 /* We use interpreter_p for the "set interpreter" variable, so we need
163 to make sure we have a malloc'ed copy for the set command to free. */
164 if (interpreter_p != NULL
165 && strcmp (current_interpreter->name, interpreter_p) != 0)
167 xfree (interpreter_p);
169 interpreter_p = xstrdup (current_interpreter->name);
172 /* Run the init proc. If it fails, try to restore the old interp. */
176 if (interp->procs->init_proc != NULL)
178 interp->data = interp->procs->init_proc (interp, top_level);
183 /* Do this only after the interpreter is initialized. */
184 current_uiout = interp->procs->ui_out_proc (interp);
186 /* Clear out any installed interpreter hooks/event handlers. */
187 clear_interpreter_hooks ();
189 if (interp->procs->resume_proc != NULL
190 && (!interp->procs->resume_proc (interp->data)))
192 if (old_interp == NULL || !interp_set (old_interp, 0))
193 internal_error (__FILE__, __LINE__,
194 _("Failed to initialize new interp \"%s\" %s"),
195 interp->name, "and could not restore old interp!\n");
199 if (!first_time && !interp_quiet_p (interp))
201 xsnprintf (buffer, sizeof (buffer),
202 "Switching to interpreter \"%.24s\".\n", interp->name);
203 ui_out_text (current_uiout, buffer);
209 /* interp_lookup - Looks up the interpreter for NAME. If no such
210 interpreter exists, return NULL, otherwise return a pointer to the
213 interp_lookup (const char *name)
215 struct interp *interp;
217 if (name == NULL || strlen (name) == 0)
220 for (interp = interp_list; interp != NULL; interp = interp->next)
222 if (strcmp (interp->name, name) == 0)
229 /* Returns the current interpreter. */
232 interp_ui_out (struct interp *interp)
235 return interp->procs->ui_out_proc (interp);
237 return current_interpreter->procs->ui_out_proc (current_interpreter);
241 current_interp_set_logging (int start_log, struct ui_file *out,
242 struct ui_file *logfile)
244 if (current_interpreter == NULL
245 || current_interpreter->procs->set_logging_proc == NULL)
248 return current_interpreter->procs->set_logging_proc (current_interpreter,
253 /* Temporarily overrides the current interpreter. */
255 interp_set_temp (const char *name)
257 struct interp *interp = interp_lookup (name);
258 struct interp *old_interp = current_interpreter;
261 current_interpreter = interp;
265 /* Returns the interpreter's cookie. */
268 interp_data (struct interp *interp)
273 /* Returns the interpreter's name. */
276 interp_name (struct interp *interp)
281 /* Returns true if the current interp is the passed in name. */
283 current_interp_named_p (const char *interp_name)
285 if (current_interpreter)
286 return (strcmp (current_interpreter->name, interp_name) == 0);
291 /* The interpreter that is active while `interp_exec' is active, NULL
292 at all other times. */
293 static struct interp *command_interpreter;
295 /* The interpreter that was active when a command was executed.
296 Normally that'd always be CURRENT_INTERPRETER, except that MI's
297 -interpreter-exec command doesn't actually flip the current
298 interpreter when running its sub-command. The
299 `command_interpreter' global tracks when interp_exec is called
300 (IOW, when -interpreter-exec is called). If that is set, it is
301 INTERP in '-interpreter-exec INTERP "CMD"' or in 'interpreter-exec
302 INTERP "CMD". Otherwise, interp_exec isn't active, and so the
303 interpreter running the command is the current interpreter. */
306 command_interp (void)
308 if (command_interpreter != NULL)
309 return command_interpreter;
311 return current_interpreter;
314 /* Run the current command interpreter's main loop. */
316 current_interp_command_loop (void)
318 gdb_assert (current_interpreter != NULL);
320 current_interpreter->procs->command_loop_proc (current_interpreter->data);
324 interp_quiet_p (struct interp *interp)
327 return interp->quiet_p;
329 return current_interpreter->quiet_p;
333 interp_set_quiet (struct interp *interp, int quiet)
335 int old_val = interp->quiet_p;
337 interp->quiet_p = quiet;
341 /* interp_exec - This executes COMMAND_STR in the current
345 interp_exec (struct interp *interp, const char *command_str)
347 struct gdb_exception ex;
348 struct interp *save_command_interp;
350 gdb_assert (interp->procs->exec_proc != NULL);
352 /* See `command_interp' for why we do this. */
353 save_command_interp = command_interpreter;
354 command_interpreter = interp;
356 ex = interp->procs->exec_proc (interp->data, command_str);
358 command_interpreter = save_command_interp;
363 /* A convenience routine that nulls out all the common command hooks.
364 Use it when removing your interpreter in its suspend proc. */
366 clear_interpreter_hooks (void)
368 deprecated_init_ui_hook = 0;
369 deprecated_print_frame_info_listing_hook = 0;
370 /*print_frame_more_info_hook = 0; */
371 deprecated_query_hook = 0;
372 deprecated_warning_hook = 0;
373 deprecated_interactive_hook = 0;
374 deprecated_readline_begin_hook = 0;
375 deprecated_readline_hook = 0;
376 deprecated_readline_end_hook = 0;
377 deprecated_register_changed_hook = 0;
378 deprecated_context_hook = 0;
379 deprecated_target_wait_hook = 0;
380 deprecated_call_command_hook = 0;
381 deprecated_error_begin_hook = 0;
385 interpreter_exec_cmd (char *args, int from_tty)
387 struct interp *old_interp, *interp_to_use;
388 char **prules = NULL;
392 int old_quiet, use_quiet;
393 struct cleanup *cleanup;
396 error_no_arg (_("interpreter-exec command"));
398 prules = gdb_buildargv (args);
399 cleanup = make_cleanup_freeargv (prules);
402 for (trule = prules; *trule != NULL; trule++)
406 error (_("usage: interpreter-exec <interpreter> [ <command> ... ]"));
408 old_interp = current_interpreter;
410 interp_to_use = interp_lookup (prules[0]);
411 if (interp_to_use == NULL)
412 error (_("Could not find interpreter \"%s\"."), prules[0]);
414 /* Temporarily set interpreters quiet. */
415 old_quiet = interp_set_quiet (old_interp, 1);
416 use_quiet = interp_set_quiet (interp_to_use, 1);
418 if (!interp_set (interp_to_use, 0))
419 error (_("Could not switch to interpreter \"%s\"."), prules[0]);
421 for (i = 1; i < nrules; i++)
423 struct gdb_exception e = interp_exec (interp_to_use, prules[i]);
427 interp_set (old_interp, 0);
428 interp_set_quiet (interp_to_use, use_quiet);
429 interp_set_quiet (old_interp, old_quiet);
430 error (_("error in command: \"%s\"."), prules[i]);
434 interp_set (old_interp, 0);
435 interp_set_quiet (interp_to_use, use_quiet);
436 interp_set_quiet (old_interp, old_quiet);
438 do_cleanups (cleanup);
441 /* List the possible interpreters which could complete the given text. */
442 static VEC (char_ptr) *
443 interpreter_completer (struct cmd_list_element *ignore,
444 const char *text, const char *word)
447 VEC (char_ptr) *matches = NULL;
448 struct interp *interp;
450 textlen = strlen (text);
451 for (interp = interp_list; interp != NULL; interp = interp->next)
453 if (strncmp (interp->name, text, textlen) == 0)
457 match = (char *) xmalloc (strlen (word) + strlen (interp->name) + 1);
459 strcpy (match, interp->name);
460 else if (word > text)
462 /* Return some portion of interp->name. */
463 strcpy (match, interp->name + (word - text));
467 /* Return some of text plus interp->name. */
468 strncpy (match, word, text - word);
469 match[text - word] = '\0';
470 strcat (match, interp->name);
472 VEC_safe_push (char_ptr, matches, match);
480 top_level_interpreter (void)
482 return top_level_interpreter_ptr;
486 top_level_interpreter_data (void)
488 gdb_assert (top_level_interpreter_ptr);
489 return top_level_interpreter_ptr->data;
492 /* This just adds the "interpreter-exec" command. */
494 _initialize_interpreter (void)
496 struct cmd_list_element *c;
498 c = add_cmd ("interpreter-exec", class_support,
499 interpreter_exec_cmd, _("\
500 Execute a command in an interpreter. It takes two arguments:\n\
501 The first argument is the name of the interpreter to use.\n\
502 The second argument is the command to execute.\n"), &cmdlist);
503 set_cmd_completer (c, interpreter_completer);