1 /* Manages interpreters for GDB, the GNU debugger.
3 Copyright (C) 2000, 2002, 2003, 2007, 2008 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"
39 #include "gdb_string.h"
40 #include "gdb_assert.h"
41 #include "top.h" /* For command_loop. */
42 #include "exceptions.h"
46 /* This is the name in "-i=" and set interpreter. */
49 /* Interpreters are stored in a linked list, this is the next
53 /* This is a cookie that an instance of the interpreter can use.
54 This is a bit confused right now as the exact initialization
55 sequence for it, and how it relates to the interpreter's uiout
56 object is a bit confused. */
59 /* Has the init_proc been run? */
62 /* This is the ui_out used to collect results for this interpreter.
63 It can be a formatter for stdout, as is the case for the console
64 & mi outputs, or it might be a result formatter. */
65 struct ui_out *interpreter_out;
67 const struct interp_procs *procs;
71 /* Functions local to this file. */
72 static void initialize_interps (void);
73 static char **interpreter_completer (char *text, char *word);
75 /* The magic initialization routine for this module. */
77 void _initialize_interpreter (void);
79 /* Variables local to this file: */
81 static struct interp *interp_list = NULL;
82 static struct interp *current_interpreter = NULL;
83 static struct interp *top_level_interpreter_ptr = NULL;
85 static int interpreter_initialized = 0;
87 /* interp_new - This allocates space for a new interpreter,
88 fills the fields from the inputs, and returns a pointer to the
91 interp_new (const char *name, void *data, struct ui_out *uiout,
92 const struct interp_procs *procs)
94 struct interp *new_interp;
96 new_interp = XMALLOC (struct interp);
98 new_interp->name = xstrdup (name);
99 new_interp->data = data;
100 new_interp->interpreter_out = uiout;
101 new_interp->quiet_p = 0;
102 new_interp->procs = procs;
103 new_interp->inited = 0;
108 /* Add interpreter INTERP to the gdb interpreter list. The
109 interpreter must not have previously been added. */
111 interp_add (struct interp *interp)
113 if (!interpreter_initialized)
114 initialize_interps ();
116 gdb_assert (interp_lookup (interp->name) == NULL);
118 interp->next = interp_list;
119 interp_list = interp;
122 /* This sets the current interpreter to be INTERP. If INTERP has not
123 been initialized, then this will also run the init proc. If the
124 init proc is successful, return 1, if it fails, set the old
125 interpreter back in place and return 0. If we can't restore the
126 old interpreter, then raise an internal error, since we are in
127 pretty bad shape at this point.
129 The TOP_LEVEL parameter tells if this new interpreter is
130 the top-level one. The top-level is what is requested
131 on the command line, and is responsible for reporting general
132 notification about target state changes. For example, if
133 MI is the top-level interpreter, then it will always report
134 events such as target stops and new thread creation, even if they
135 are caused by CLI commands. */
137 interp_set (struct interp *interp, int top_level)
139 struct interp *old_interp = current_interpreter;
143 /* If we already have an interpreter, then trying to
144 set top level interpreter is kinda pointless. */
145 gdb_assert (!top_level || !current_interpreter);
146 gdb_assert (!top_level || !top_level_interpreter_ptr);
148 if (current_interpreter != NULL)
150 do_all_continuations ();
151 ui_out_flush (uiout);
152 if (current_interpreter->procs->suspend_proc
153 && !current_interpreter->procs->suspend_proc (current_interpreter->
156 error (_("Could not suspend interpreter \"%s\"."),
157 current_interpreter->name);
165 current_interpreter = interp;
167 top_level_interpreter_ptr = interp;
169 /* We use interpreter_p for the "set interpreter" variable, so we need
170 to make sure we have a malloc'ed copy for the set command to free. */
171 if (interpreter_p != NULL
172 && strcmp (current_interpreter->name, interpreter_p) != 0)
174 xfree (interpreter_p);
176 interpreter_p = xstrdup (current_interpreter->name);
179 uiout = interp->interpreter_out;
181 /* Run the init proc. If it fails, try to restore the old interp. */
185 if (interp->procs->init_proc != NULL)
187 interp->data = interp->procs->init_proc (top_level);
192 /* Clear out any installed interpreter hooks/event handlers. */
193 clear_interpreter_hooks ();
195 if (interp->procs->resume_proc != NULL
196 && (!interp->procs->resume_proc (interp->data)))
198 if (old_interp == NULL || !interp_set (old_interp, 0))
199 internal_error (__FILE__, __LINE__,
200 _("Failed to initialize new interp \"%s\" %s"),
201 interp->name, "and could not restore old interp!\n");
205 /* Finally, put up the new prompt to show that we are indeed here.
206 Also, display_gdb_prompt for the console does some readline magic
207 which is needed for the console interpreter, at least... */
211 if (!interp_quiet_p (interp))
213 sprintf (buffer, "Switching to interpreter \"%.24s\".\n",
215 ui_out_text (uiout, buffer);
217 display_gdb_prompt (NULL);
223 /* interp_lookup - Looks up the interpreter for NAME. If no such
224 interpreter exists, return NULL, otherwise return a pointer to the
227 interp_lookup (const char *name)
229 struct interp *interp;
231 if (name == NULL || strlen (name) == 0)
234 for (interp = interp_list; interp != NULL; interp = interp->next)
236 if (strcmp (interp->name, name) == 0)
243 /* Returns the current interpreter. */
246 interp_ui_out (struct interp *interp)
249 return interp->interpreter_out;
251 return current_interpreter->interpreter_out;
254 /* Returns true if the current interp is the passed in name. */
256 current_interp_named_p (const char *interp_name)
258 if (current_interpreter)
259 return (strcmp (current_interpreter->name, interp_name) == 0);
264 /* This is called in display_gdb_prompt. If the proc returns a zero
265 value, display_gdb_prompt will return without displaying the
268 current_interp_display_prompt_p (void)
270 if (current_interpreter == NULL
271 || current_interpreter->procs->prompt_proc_p == NULL)
274 return current_interpreter->procs->prompt_proc_p (current_interpreter->
278 /* Run the current command interpreter's main loop. */
280 current_interp_command_loop (void)
282 /* Somewhat messy. For the moment prop up all the old ways of
283 selecting the command loop. `deprecated_command_loop_hook'
284 should be deprecated. */
285 if (deprecated_command_loop_hook != NULL)
286 deprecated_command_loop_hook ();
287 else if (current_interpreter != NULL
288 && current_interpreter->procs->command_loop_proc != NULL)
289 current_interpreter->procs->command_loop_proc (current_interpreter->data);
295 interp_quiet_p (struct interp *interp)
298 return interp->quiet_p;
300 return current_interpreter->quiet_p;
304 interp_set_quiet (struct interp *interp, int quiet)
306 int old_val = interp->quiet_p;
307 interp->quiet_p = quiet;
311 /* interp_exec - This executes COMMAND_STR in the current
314 interp_exec_p (struct interp *interp)
316 return interp->procs->exec_proc != NULL;
320 interp_exec (struct interp *interp, const char *command_str)
322 if (interp->procs->exec_proc != NULL)
324 return interp->procs->exec_proc (interp->data, command_str);
326 return exception_none;
329 /* A convenience routine that nulls out all the common command hooks.
330 Use it when removing your interpreter in its suspend proc. */
332 clear_interpreter_hooks (void)
334 deprecated_init_ui_hook = 0;
335 deprecated_print_frame_info_listing_hook = 0;
336 /*print_frame_more_info_hook = 0; */
337 deprecated_query_hook = 0;
338 deprecated_warning_hook = 0;
339 deprecated_create_breakpoint_hook = 0;
340 deprecated_delete_breakpoint_hook = 0;
341 deprecated_modify_breakpoint_hook = 0;
342 deprecated_interactive_hook = 0;
343 deprecated_readline_begin_hook = 0;
344 deprecated_readline_hook = 0;
345 deprecated_readline_end_hook = 0;
346 deprecated_register_changed_hook = 0;
347 deprecated_memory_changed_hook = 0;
348 deprecated_context_hook = 0;
349 deprecated_target_wait_hook = 0;
350 deprecated_call_command_hook = 0;
351 deprecated_error_hook = 0;
352 deprecated_error_begin_hook = 0;
353 deprecated_command_loop_hook = 0;
356 /* This is a lazy init routine, called the first time the interpreter
357 module is used. I put it here just in case, but I haven't thought
358 of a use for it yet. I will probably bag it soon, since I don't
359 think it will be necessary. */
361 initialize_interps (void)
363 interpreter_initialized = 1;
364 /* Don't know if anything needs to be done here... */
368 interpreter_exec_cmd (char *args, int from_tty)
370 struct interp *old_interp, *interp_to_use;
371 char **prules = NULL;
375 int old_quiet, use_quiet;
377 prules = buildargv (args);
380 error (_("unable to parse arguments"));
386 for (trule = prules; *trule != NULL; trule++)
393 error (_("usage: interpreter-exec <interpreter> [ <command> ... ]"));
395 old_interp = current_interpreter;
397 interp_to_use = interp_lookup (prules[0]);
398 if (interp_to_use == NULL)
399 error (_("Could not find interpreter \"%s\"."), prules[0]);
401 /* Temporarily set interpreters quiet */
402 old_quiet = interp_set_quiet (old_interp, 1);
403 use_quiet = interp_set_quiet (interp_to_use, 1);
405 if (!interp_set (interp_to_use, 0))
406 error (_("Could not switch to interpreter \"%s\"."), prules[0]);
408 for (i = 1; i < nrules; i++)
410 struct gdb_exception e = interp_exec (interp_to_use, prules[i]);
413 interp_set (old_interp, 0);
414 interp_set_quiet (interp_to_use, use_quiet);
415 interp_set_quiet (old_interp, old_quiet);
416 error (_("error in command: \"%s\"."), prules[i]);
420 interp_set (old_interp, 0);
421 interp_set_quiet (interp_to_use, use_quiet);
422 interp_set_quiet (old_interp, old_quiet);
425 /* List the possible interpreters which could complete the given text. */
427 interpreter_completer (char *text, char *word)
433 struct interp *interp;
435 /* We expect only a very limited number of interpreters, so just
436 allocate room for all of them plus one for the last that must be NULL
437 to correctly end the list. */
438 for (interp = interp_list; interp != NULL; interp = interp->next)
440 matches = (char **) xcalloc (alloced + 1, sizeof (char *));
443 textlen = strlen (text);
444 for (interp = interp_list; interp != NULL; interp = interp->next)
446 if (strncmp (interp->name, text, textlen) == 0)
448 matches[num_matches] =
449 (char *) xmalloc (strlen (word) + strlen (interp->name) + 1);
451 strcpy (matches[num_matches], interp->name);
452 else if (word > text)
454 /* Return some portion of interp->name */
455 strcpy (matches[num_matches], interp->name + (word - text));
459 /* Return some of text plus interp->name */
460 strncpy (matches[num_matches], word, text - word);
461 matches[num_matches][text - word] = '\0';
462 strcat (matches[num_matches], interp->name);
468 if (num_matches == 0)
478 top_level_interpreter (void)
480 return top_level_interpreter_ptr;
484 top_level_interpreter_data (void)
486 gdb_assert (top_level_interpreter_ptr);
487 return top_level_interpreter_ptr->data;
490 /* This just adds the "interpreter-exec" command. */
492 _initialize_interpreter (void)
494 struct cmd_list_element *c;
496 c = add_cmd ("interpreter-exec", class_support,
497 interpreter_exec_cmd, _("\
498 Execute a command in an interpreter. It takes two arguments:\n\
499 The first argument is the name of the interpreter to use.\n\
500 The second argument is the command to execute.\n"), &cmdlist);
501 set_cmd_completer (c, interpreter_completer);