| 1 | /* Manages interpreters for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2000, 2002-2003, 2007-2012 Free Software Foundation, |
| 4 | Inc. |
| 5 | |
| 6 | Written by Jim Ingham <jingham@apple.com> of Apple Computer, Inc. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 22 | |
| 23 | /* This is just a first cut at separating out the "interpreter" |
| 24 | functions of gdb into self-contained modules. There are a couple |
| 25 | of open areas that need to be sorted out: |
| 26 | |
| 27 | 1) The interpreter explicitly contains a UI_OUT, and can insert itself |
| 28 | into the event loop, but it doesn't explicitly contain hooks for readline. |
| 29 | I did this because it seems to me many interpreters won't want to use |
| 30 | the readline command interface, and it is probably simpler to just let |
| 31 | them take over the input in their resume proc. */ |
| 32 | |
| 33 | #include "defs.h" |
| 34 | #include "gdbcmd.h" |
| 35 | #include "ui-out.h" |
| 36 | #include "event-loop.h" |
| 37 | #include "event-top.h" |
| 38 | #include "interps.h" |
| 39 | #include "completer.h" |
| 40 | #include "gdb_string.h" |
| 41 | #include "gdb_assert.h" |
| 42 | #include "top.h" /* For command_loop. */ |
| 43 | #include "exceptions.h" |
| 44 | #include "continuations.h" |
| 45 | |
| 46 | /* True if the current interpreter in is async mode. See interps.h |
| 47 | for more details. This starts out disabled, until all the explicit |
| 48 | command line arguments (e.g., `gdb -ex "start" -ex "next"') are |
| 49 | processed. */ |
| 50 | int interpreter_async = 0; |
| 51 | |
| 52 | struct interp |
| 53 | { |
| 54 | /* This is the name in "-i=" and set interpreter. */ |
| 55 | const char *name; |
| 56 | |
| 57 | /* Interpreters are stored in a linked list, this is the next |
| 58 | one... */ |
| 59 | struct interp *next; |
| 60 | |
| 61 | /* This is a cookie that an instance of the interpreter can use. |
| 62 | This is a bit confused right now as the exact initialization |
| 63 | sequence for it, and how it relates to the interpreter's uiout |
| 64 | object is a bit confused. */ |
| 65 | void *data; |
| 66 | |
| 67 | /* Has the init_proc been run? */ |
| 68 | int inited; |
| 69 | |
| 70 | const struct interp_procs *procs; |
| 71 | int quiet_p; |
| 72 | }; |
| 73 | |
| 74 | /* Functions local to this file. */ |
| 75 | static void initialize_interps (void); |
| 76 | static char **interpreter_completer (struct cmd_list_element *cmd, |
| 77 | char *text, char *word); |
| 78 | |
| 79 | /* The magic initialization routine for this module. */ |
| 80 | |
| 81 | void _initialize_interpreter (void); |
| 82 | |
| 83 | /* Variables local to this file: */ |
| 84 | |
| 85 | static struct interp *interp_list = NULL; |
| 86 | static struct interp *current_interpreter = NULL; |
| 87 | static struct interp *top_level_interpreter_ptr = NULL; |
| 88 | |
| 89 | static int interpreter_initialized = 0; |
| 90 | |
| 91 | /* interp_new - This allocates space for a new interpreter, |
| 92 | fills the fields from the inputs, and returns a pointer to the |
| 93 | interpreter. */ |
| 94 | struct interp * |
| 95 | interp_new (const char *name, const struct interp_procs *procs) |
| 96 | { |
| 97 | struct interp *new_interp; |
| 98 | |
| 99 | new_interp = XMALLOC (struct interp); |
| 100 | |
| 101 | new_interp->name = xstrdup (name); |
| 102 | new_interp->data = NULL; |
| 103 | new_interp->quiet_p = 0; |
| 104 | new_interp->procs = procs; |
| 105 | new_interp->inited = 0; |
| 106 | |
| 107 | return new_interp; |
| 108 | } |
| 109 | |
| 110 | /* Add interpreter INTERP to the gdb interpreter list. The |
| 111 | interpreter must not have previously been added. */ |
| 112 | void |
| 113 | interp_add (struct interp *interp) |
| 114 | { |
| 115 | if (!interpreter_initialized) |
| 116 | initialize_interps (); |
| 117 | |
| 118 | gdb_assert (interp_lookup (interp->name) == NULL); |
| 119 | |
| 120 | interp->next = interp_list; |
| 121 | interp_list = interp; |
| 122 | } |
| 123 | |
| 124 | /* This sets the current interpreter to be INTERP. If INTERP has not |
| 125 | been initialized, then this will also run the init proc. If the |
| 126 | init proc is successful, return 1, if it fails, set the old |
| 127 | interpreter back in place and return 0. If we can't restore the |
| 128 | old interpreter, then raise an internal error, since we are in |
| 129 | pretty bad shape at this point. |
| 130 | |
| 131 | The TOP_LEVEL parameter tells if this new interpreter is |
| 132 | the top-level one. The top-level is what is requested |
| 133 | on the command line, and is responsible for reporting general |
| 134 | notification about target state changes. For example, if |
| 135 | MI is the top-level interpreter, then it will always report |
| 136 | events such as target stops and new thread creation, even if they |
| 137 | are caused by CLI commands. */ |
| 138 | int |
| 139 | interp_set (struct interp *interp, int top_level) |
| 140 | { |
| 141 | struct interp *old_interp = current_interpreter; |
| 142 | int first_time = 0; |
| 143 | char buffer[64]; |
| 144 | |
| 145 | /* If we already have an interpreter, then trying to |
| 146 | set top level interpreter is kinda pointless. */ |
| 147 | gdb_assert (!top_level || !current_interpreter); |
| 148 | gdb_assert (!top_level || !top_level_interpreter_ptr); |
| 149 | |
| 150 | if (current_interpreter != NULL) |
| 151 | { |
| 152 | ui_out_flush (current_uiout); |
| 153 | if (current_interpreter->procs->suspend_proc |
| 154 | && !current_interpreter->procs->suspend_proc (current_interpreter-> |
| 155 | data)) |
| 156 | { |
| 157 | error (_("Could not suspend interpreter \"%s\"."), |
| 158 | current_interpreter->name); |
| 159 | } |
| 160 | } |
| 161 | else |
| 162 | { |
| 163 | first_time = 1; |
| 164 | } |
| 165 | |
| 166 | current_interpreter = interp; |
| 167 | if (top_level) |
| 168 | top_level_interpreter_ptr = interp; |
| 169 | |
| 170 | /* We use interpreter_p for the "set interpreter" variable, so we need |
| 171 | to make sure we have a malloc'ed copy for the set command to free. */ |
| 172 | if (interpreter_p != NULL |
| 173 | && strcmp (current_interpreter->name, interpreter_p) != 0) |
| 174 | { |
| 175 | xfree (interpreter_p); |
| 176 | |
| 177 | interpreter_p = xstrdup (current_interpreter->name); |
| 178 | } |
| 179 | |
| 180 | /* Run the init proc. If it fails, try to restore the old interp. */ |
| 181 | |
| 182 | if (!interp->inited) |
| 183 | { |
| 184 | if (interp->procs->init_proc != NULL) |
| 185 | { |
| 186 | interp->data = interp->procs->init_proc (interp, top_level); |
| 187 | } |
| 188 | interp->inited = 1; |
| 189 | } |
| 190 | |
| 191 | /* Do this only after the interpreter is initialized. */ |
| 192 | current_uiout = interp->procs->ui_out_proc (interp); |
| 193 | |
| 194 | /* Clear out any installed interpreter hooks/event handlers. */ |
| 195 | clear_interpreter_hooks (); |
| 196 | |
| 197 | if (interp->procs->resume_proc != NULL |
| 198 | && (!interp->procs->resume_proc (interp->data))) |
| 199 | { |
| 200 | if (old_interp == NULL || !interp_set (old_interp, 0)) |
| 201 | internal_error (__FILE__, __LINE__, |
| 202 | _("Failed to initialize new interp \"%s\" %s"), |
| 203 | interp->name, "and could not restore old interp!\n"); |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | /* Finally, put up the new prompt to show that we are indeed here. |
| 208 | Also, display_gdb_prompt for the console does some readline magic |
| 209 | which is needed for the console interpreter, at least... */ |
| 210 | |
| 211 | if (!first_time) |
| 212 | { |
| 213 | if (!interp_quiet_p (interp)) |
| 214 | { |
| 215 | sprintf (buffer, "Switching to interpreter \"%.24s\".\n", |
| 216 | interp->name); |
| 217 | ui_out_text (current_uiout, buffer); |
| 218 | } |
| 219 | display_gdb_prompt (NULL); |
| 220 | } |
| 221 | |
| 222 | return 1; |
| 223 | } |
| 224 | |
| 225 | /* interp_lookup - Looks up the interpreter for NAME. If no such |
| 226 | interpreter exists, return NULL, otherwise return a pointer to the |
| 227 | interpreter. */ |
| 228 | struct interp * |
| 229 | interp_lookup (const char *name) |
| 230 | { |
| 231 | struct interp *interp; |
| 232 | |
| 233 | if (name == NULL || strlen (name) == 0) |
| 234 | return NULL; |
| 235 | |
| 236 | for (interp = interp_list; interp != NULL; interp = interp->next) |
| 237 | { |
| 238 | if (strcmp (interp->name, name) == 0) |
| 239 | return interp; |
| 240 | } |
| 241 | |
| 242 | return NULL; |
| 243 | } |
| 244 | |
| 245 | /* Returns the current interpreter. */ |
| 246 | |
| 247 | struct ui_out * |
| 248 | interp_ui_out (struct interp *interp) |
| 249 | { |
| 250 | if (interp != NULL) |
| 251 | return interp->procs->ui_out_proc (interp); |
| 252 | |
| 253 | return current_interpreter->procs->ui_out_proc (current_interpreter); |
| 254 | } |
| 255 | |
| 256 | /* Returns the interpreter's cookie. */ |
| 257 | |
| 258 | void * |
| 259 | interp_data (struct interp *interp) |
| 260 | { |
| 261 | return interp->data; |
| 262 | } |
| 263 | |
| 264 | /* Returns the interpreter's name. */ |
| 265 | |
| 266 | const char * |
| 267 | interp_name (struct interp *interp) |
| 268 | { |
| 269 | return interp->name; |
| 270 | } |
| 271 | |
| 272 | /* Returns true if the current interp is the passed in name. */ |
| 273 | int |
| 274 | current_interp_named_p (const char *interp_name) |
| 275 | { |
| 276 | if (current_interpreter) |
| 277 | return (strcmp (current_interpreter->name, interp_name) == 0); |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | /* This is called in display_gdb_prompt. If the proc returns a zero |
| 283 | value, display_gdb_prompt will return without displaying the |
| 284 | prompt. */ |
| 285 | int |
| 286 | current_interp_display_prompt_p (void) |
| 287 | { |
| 288 | if (current_interpreter == NULL |
| 289 | || current_interpreter->procs->prompt_proc_p == NULL) |
| 290 | return 0; |
| 291 | else |
| 292 | return current_interpreter->procs->prompt_proc_p (current_interpreter-> |
| 293 | data); |
| 294 | } |
| 295 | |
| 296 | /* Run the current command interpreter's main loop. */ |
| 297 | void |
| 298 | current_interp_command_loop (void) |
| 299 | { |
| 300 | /* Somewhat messy. For the moment prop up all the old ways of |
| 301 | selecting the command loop. `deprecated_command_loop_hook' |
| 302 | should be deprecated. */ |
| 303 | if (deprecated_command_loop_hook != NULL) |
| 304 | deprecated_command_loop_hook (); |
| 305 | else if (current_interpreter != NULL |
| 306 | && current_interpreter->procs->command_loop_proc != NULL) |
| 307 | current_interpreter->procs->command_loop_proc (current_interpreter->data); |
| 308 | else |
| 309 | cli_command_loop (); |
| 310 | } |
| 311 | |
| 312 | int |
| 313 | interp_quiet_p (struct interp *interp) |
| 314 | { |
| 315 | if (interp != NULL) |
| 316 | return interp->quiet_p; |
| 317 | else |
| 318 | return current_interpreter->quiet_p; |
| 319 | } |
| 320 | |
| 321 | static int |
| 322 | interp_set_quiet (struct interp *interp, int quiet) |
| 323 | { |
| 324 | int old_val = interp->quiet_p; |
| 325 | |
| 326 | interp->quiet_p = quiet; |
| 327 | return old_val; |
| 328 | } |
| 329 | |
| 330 | /* interp_exec - This executes COMMAND_STR in the current |
| 331 | interpreter. */ |
| 332 | int |
| 333 | interp_exec_p (struct interp *interp) |
| 334 | { |
| 335 | return interp->procs->exec_proc != NULL; |
| 336 | } |
| 337 | |
| 338 | struct gdb_exception |
| 339 | interp_exec (struct interp *interp, const char *command_str) |
| 340 | { |
| 341 | if (interp->procs->exec_proc != NULL) |
| 342 | { |
| 343 | return interp->procs->exec_proc (interp->data, command_str); |
| 344 | } |
| 345 | return exception_none; |
| 346 | } |
| 347 | |
| 348 | /* A convenience routine that nulls out all the common command hooks. |
| 349 | Use it when removing your interpreter in its suspend proc. */ |
| 350 | void |
| 351 | clear_interpreter_hooks (void) |
| 352 | { |
| 353 | deprecated_init_ui_hook = 0; |
| 354 | deprecated_print_frame_info_listing_hook = 0; |
| 355 | /*print_frame_more_info_hook = 0; */ |
| 356 | deprecated_query_hook = 0; |
| 357 | deprecated_warning_hook = 0; |
| 358 | deprecated_interactive_hook = 0; |
| 359 | deprecated_readline_begin_hook = 0; |
| 360 | deprecated_readline_hook = 0; |
| 361 | deprecated_readline_end_hook = 0; |
| 362 | deprecated_register_changed_hook = 0; |
| 363 | deprecated_context_hook = 0; |
| 364 | deprecated_target_wait_hook = 0; |
| 365 | deprecated_call_command_hook = 0; |
| 366 | deprecated_error_begin_hook = 0; |
| 367 | deprecated_command_loop_hook = 0; |
| 368 | } |
| 369 | |
| 370 | /* This is a lazy init routine, called the first time the interpreter |
| 371 | module is used. I put it here just in case, but I haven't thought |
| 372 | of a use for it yet. I will probably bag it soon, since I don't |
| 373 | think it will be necessary. */ |
| 374 | static void |
| 375 | initialize_interps (void) |
| 376 | { |
| 377 | interpreter_initialized = 1; |
| 378 | /* Don't know if anything needs to be done here... */ |
| 379 | } |
| 380 | |
| 381 | static void |
| 382 | interpreter_exec_cmd (char *args, int from_tty) |
| 383 | { |
| 384 | struct interp *old_interp, *interp_to_use; |
| 385 | char **prules = NULL; |
| 386 | char **trule = NULL; |
| 387 | unsigned int nrules; |
| 388 | unsigned int i; |
| 389 | int old_quiet, use_quiet; |
| 390 | |
| 391 | if (args == NULL) |
| 392 | error_no_arg (_("interpreter-exec command")); |
| 393 | |
| 394 | prules = gdb_buildargv (args); |
| 395 | make_cleanup_freeargv (prules); |
| 396 | |
| 397 | nrules = 0; |
| 398 | for (trule = prules; *trule != NULL; trule++) |
| 399 | nrules++; |
| 400 | |
| 401 | if (nrules < 2) |
| 402 | error (_("usage: interpreter-exec <interpreter> [ <command> ... ]")); |
| 403 | |
| 404 | old_interp = current_interpreter; |
| 405 | |
| 406 | interp_to_use = interp_lookup (prules[0]); |
| 407 | if (interp_to_use == NULL) |
| 408 | error (_("Could not find interpreter \"%s\"."), prules[0]); |
| 409 | |
| 410 | /* Temporarily set interpreters quiet. */ |
| 411 | old_quiet = interp_set_quiet (old_interp, 1); |
| 412 | use_quiet = interp_set_quiet (interp_to_use, 1); |
| 413 | |
| 414 | if (!interp_set (interp_to_use, 0)) |
| 415 | error (_("Could not switch to interpreter \"%s\"."), prules[0]); |
| 416 | |
| 417 | for (i = 1; i < nrules; i++) |
| 418 | { |
| 419 | struct gdb_exception e = interp_exec (interp_to_use, prules[i]); |
| 420 | |
| 421 | if (e.reason < 0) |
| 422 | { |
| 423 | interp_set (old_interp, 0); |
| 424 | interp_set_quiet (interp_to_use, use_quiet); |
| 425 | interp_set_quiet (old_interp, old_quiet); |
| 426 | error (_("error in command: \"%s\"."), prules[i]); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | interp_set (old_interp, 0); |
| 431 | interp_set_quiet (interp_to_use, use_quiet); |
| 432 | interp_set_quiet (old_interp, old_quiet); |
| 433 | } |
| 434 | |
| 435 | /* List the possible interpreters which could complete the given text. */ |
| 436 | static char ** |
| 437 | interpreter_completer (struct cmd_list_element *ignore, char *text, char *word) |
| 438 | { |
| 439 | int alloced = 0; |
| 440 | int textlen; |
| 441 | int num_matches; |
| 442 | char **matches; |
| 443 | struct interp *interp; |
| 444 | |
| 445 | /* We expect only a very limited number of interpreters, so just |
| 446 | allocate room for all of them plus one for the last that must be NULL |
| 447 | to correctly end the list. */ |
| 448 | for (interp = interp_list; interp != NULL; interp = interp->next) |
| 449 | ++alloced; |
| 450 | matches = (char **) xcalloc (alloced + 1, sizeof (char *)); |
| 451 | |
| 452 | num_matches = 0; |
| 453 | textlen = strlen (text); |
| 454 | for (interp = interp_list; interp != NULL; interp = interp->next) |
| 455 | { |
| 456 | if (strncmp (interp->name, text, textlen) == 0) |
| 457 | { |
| 458 | matches[num_matches] = |
| 459 | (char *) xmalloc (strlen (word) + strlen (interp->name) + 1); |
| 460 | if (word == text) |
| 461 | strcpy (matches[num_matches], interp->name); |
| 462 | else if (word > text) |
| 463 | { |
| 464 | /* Return some portion of interp->name. */ |
| 465 | strcpy (matches[num_matches], interp->name + (word - text)); |
| 466 | } |
| 467 | else |
| 468 | { |
| 469 | /* Return some of text plus interp->name. */ |
| 470 | strncpy (matches[num_matches], word, text - word); |
| 471 | matches[num_matches][text - word] = '\0'; |
| 472 | strcat (matches[num_matches], interp->name); |
| 473 | } |
| 474 | ++num_matches; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | if (num_matches == 0) |
| 479 | { |
| 480 | xfree (matches); |
| 481 | matches = NULL; |
| 482 | } |
| 483 | |
| 484 | return matches; |
| 485 | } |
| 486 | |
| 487 | struct interp * |
| 488 | top_level_interpreter (void) |
| 489 | { |
| 490 | return top_level_interpreter_ptr; |
| 491 | } |
| 492 | |
| 493 | void * |
| 494 | top_level_interpreter_data (void) |
| 495 | { |
| 496 | gdb_assert (top_level_interpreter_ptr); |
| 497 | return top_level_interpreter_ptr->data; |
| 498 | } |
| 499 | |
| 500 | /* This just adds the "interpreter-exec" command. */ |
| 501 | void |
| 502 | _initialize_interpreter (void) |
| 503 | { |
| 504 | struct cmd_list_element *c; |
| 505 | |
| 506 | c = add_cmd ("interpreter-exec", class_support, |
| 507 | interpreter_exec_cmd, _("\ |
| 508 | Execute a command in an interpreter. It takes two arguments:\n\ |
| 509 | The first argument is the name of the interpreter to use.\n\ |
| 510 | The second argument is the command to execute.\n"), &cmdlist); |
| 511 | set_cmd_completer (c, interpreter_completer); |
| 512 | } |