| 1 | /* C preprocessor macro expansion commands for GDB. |
| 2 | Copyright (C) 2002-2016 Free Software Foundation, Inc. |
| 3 | Contributed by Red Hat, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "macrotab.h" |
| 23 | #include "macroexp.h" |
| 24 | #include "macroscope.h" |
| 25 | #include "cli/cli-utils.h" |
| 26 | #include "command.h" |
| 27 | #include "gdbcmd.h" |
| 28 | #include "linespec.h" |
| 29 | |
| 30 | \f |
| 31 | /* The `macro' prefix command. */ |
| 32 | |
| 33 | static struct cmd_list_element *macrolist; |
| 34 | |
| 35 | static void |
| 36 | macro_command (char *arg, int from_tty) |
| 37 | { |
| 38 | printf_unfiltered |
| 39 | ("\"macro\" must be followed by the name of a macro command.\n"); |
| 40 | help_list (macrolist, "macro ", all_commands, gdb_stdout); |
| 41 | } |
| 42 | |
| 43 | |
| 44 | \f |
| 45 | /* Macro expansion commands. */ |
| 46 | |
| 47 | |
| 48 | /* Prints an informational message regarding the lack of macro information. */ |
| 49 | static void |
| 50 | macro_inform_no_debuginfo (void) |
| 51 | { |
| 52 | puts_filtered ("GDB has no preprocessor macro information for that code.\n"); |
| 53 | } |
| 54 | |
| 55 | static void |
| 56 | macro_expand_command (char *exp, int from_tty) |
| 57 | { |
| 58 | struct macro_scope *ms = NULL; |
| 59 | char *expanded = NULL; |
| 60 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); |
| 61 | |
| 62 | make_cleanup (free_current_contents, &expanded); |
| 63 | |
| 64 | /* You know, when the user doesn't specify any expression, it would be |
| 65 | really cool if this defaulted to the last expression evaluated. |
| 66 | Then it would be easy to ask, "Hey, what did I just evaluate?" But |
| 67 | at the moment, the `print' commands don't save the last expression |
| 68 | evaluated, just its value. */ |
| 69 | if (! exp || ! *exp) |
| 70 | error (_("You must follow the `macro expand' command with the" |
| 71 | " expression you\n" |
| 72 | "want to expand.")); |
| 73 | |
| 74 | ms = default_macro_scope (); |
| 75 | if (ms) |
| 76 | { |
| 77 | expanded = macro_expand (exp, standard_macro_lookup, ms); |
| 78 | fputs_filtered ("expands to: ", gdb_stdout); |
| 79 | fputs_filtered (expanded, gdb_stdout); |
| 80 | fputs_filtered ("\n", gdb_stdout); |
| 81 | } |
| 82 | else |
| 83 | macro_inform_no_debuginfo (); |
| 84 | |
| 85 | do_cleanups (cleanup_chain); |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | static void |
| 91 | macro_expand_once_command (char *exp, int from_tty) |
| 92 | { |
| 93 | struct macro_scope *ms = NULL; |
| 94 | char *expanded = NULL; |
| 95 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); |
| 96 | make_cleanup (free_current_contents, &expanded); |
| 97 | |
| 98 | /* You know, when the user doesn't specify any expression, it would be |
| 99 | really cool if this defaulted to the last expression evaluated. |
| 100 | And it should set the once-expanded text as the new `last |
| 101 | expression'. That way, you could just hit return over and over and |
| 102 | see the expression expanded one level at a time. */ |
| 103 | if (! exp || ! *exp) |
| 104 | error (_("You must follow the `macro expand-once' command with" |
| 105 | " the expression\n" |
| 106 | "you want to expand.")); |
| 107 | |
| 108 | ms = default_macro_scope (); |
| 109 | if (ms) |
| 110 | { |
| 111 | expanded = macro_expand_once (exp, standard_macro_lookup, ms); |
| 112 | fputs_filtered ("expands to: ", gdb_stdout); |
| 113 | fputs_filtered (expanded, gdb_stdout); |
| 114 | fputs_filtered ("\n", gdb_stdout); |
| 115 | } |
| 116 | else |
| 117 | macro_inform_no_debuginfo (); |
| 118 | |
| 119 | do_cleanups (cleanup_chain); |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | /* Outputs the include path of a macro starting at FILE and LINE to STREAM. |
| 124 | |
| 125 | Care should be taken that this function does not cause any lookups into |
| 126 | the splay tree so that it can be safely used while iterating. */ |
| 127 | static void |
| 128 | show_pp_source_pos (struct ui_file *stream, |
| 129 | struct macro_source_file *file, |
| 130 | int line) |
| 131 | { |
| 132 | char *fullname; |
| 133 | |
| 134 | fullname = macro_source_fullname (file); |
| 135 | fprintf_filtered (stream, "%s:%d\n", fullname, line); |
| 136 | xfree (fullname); |
| 137 | |
| 138 | while (file->included_by) |
| 139 | { |
| 140 | fullname = macro_source_fullname (file->included_by); |
| 141 | fprintf_filtered (gdb_stdout, " included at %s:%d\n", fullname, |
| 142 | file->included_at_line); |
| 143 | xfree (fullname); |
| 144 | file = file->included_by; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | /* Outputs a macro for human consumption, detailing the include path |
| 149 | and macro definition. NAME is the name of the macro. |
| 150 | D the definition. FILE the start of the include path, and LINE the |
| 151 | line number in FILE. |
| 152 | |
| 153 | Care should be taken that this function does not cause any lookups into |
| 154 | the splay tree so that it can be safely used while iterating. */ |
| 155 | static void |
| 156 | print_macro_definition (const char *name, |
| 157 | const struct macro_definition *d, |
| 158 | struct macro_source_file *file, |
| 159 | int line) |
| 160 | { |
| 161 | fprintf_filtered (gdb_stdout, "Defined at "); |
| 162 | show_pp_source_pos (gdb_stdout, file, line); |
| 163 | |
| 164 | if (line != 0) |
| 165 | fprintf_filtered (gdb_stdout, "#define %s", name); |
| 166 | else |
| 167 | fprintf_filtered (gdb_stdout, "-D%s", name); |
| 168 | |
| 169 | if (d->kind == macro_function_like) |
| 170 | { |
| 171 | int i; |
| 172 | |
| 173 | fputs_filtered ("(", gdb_stdout); |
| 174 | for (i = 0; i < d->argc; i++) |
| 175 | { |
| 176 | fputs_filtered (d->argv[i], gdb_stdout); |
| 177 | if (i + 1 < d->argc) |
| 178 | fputs_filtered (", ", gdb_stdout); |
| 179 | } |
| 180 | fputs_filtered (")", gdb_stdout); |
| 181 | } |
| 182 | |
| 183 | if (line != 0) |
| 184 | fprintf_filtered (gdb_stdout, " %s\n", d->replacement); |
| 185 | else |
| 186 | fprintf_filtered (gdb_stdout, "=%s\n", d->replacement); |
| 187 | } |
| 188 | |
| 189 | /* A callback function for usage with macro_for_each and friends. |
| 190 | If USER_DATA is null all macros will be printed. |
| 191 | Otherwise USER_DATA is considered to be a string, printing |
| 192 | only macros who's NAME matches USER_DATA. Other arguments are |
| 193 | routed to print_macro_definition. */ |
| 194 | static void |
| 195 | print_macro_callback (const char *name, const struct macro_definition *macro, |
| 196 | struct macro_source_file *source, int line, |
| 197 | void *user_data) |
| 198 | { |
| 199 | if (! user_data || strcmp ((const char *) user_data, name) == 0) |
| 200 | print_macro_definition (name, macro, source, line); |
| 201 | } |
| 202 | |
| 203 | /* The implementation of the `info macro' command. */ |
| 204 | static void |
| 205 | info_macro_command (char *args, int from_tty) |
| 206 | { |
| 207 | struct macro_scope *ms = NULL; |
| 208 | struct cleanup *cleanup_chain; |
| 209 | char *name; |
| 210 | int show_all_macros_named = 0; |
| 211 | char *arg_start = args; |
| 212 | int processing_args = 1; |
| 213 | |
| 214 | while (processing_args |
| 215 | && arg_start && *arg_start == '-' && *arg_start != '\0') |
| 216 | { |
| 217 | char *p = skip_to_space (arg_start); |
| 218 | |
| 219 | if (strncmp (arg_start, "-a", p - arg_start) == 0 |
| 220 | || strncmp (arg_start, "-all", p - arg_start) == 0) |
| 221 | show_all_macros_named = 1; |
| 222 | else if (strncmp (arg_start, "--", p - arg_start) == 0) |
| 223 | /* Our macro support seems rather C specific but this would |
| 224 | seem necessary for languages allowing - in macro names. |
| 225 | e.g. Scheme's (defmacro ->foo () "bar\n") */ |
| 226 | processing_args = 0; |
| 227 | else |
| 228 | { |
| 229 | /* Relies on modified 'args' not making it in to history */ |
| 230 | *p = '\0'; |
| 231 | error (_("Unrecognized option '%s' to info macro command. " |
| 232 | "Try \"help info macro\"."), arg_start); |
| 233 | } |
| 234 | |
| 235 | arg_start = skip_spaces (p); |
| 236 | } |
| 237 | |
| 238 | name = arg_start; |
| 239 | |
| 240 | if (! name || ! *name) |
| 241 | error (_("You must follow the `info macro' command with the name" |
| 242 | " of the macro\n" |
| 243 | "whose definition you want to see.")); |
| 244 | |
| 245 | ms = default_macro_scope (); |
| 246 | cleanup_chain = make_cleanup (free_current_contents, &ms); |
| 247 | |
| 248 | if (! ms) |
| 249 | macro_inform_no_debuginfo (); |
| 250 | else if (show_all_macros_named) |
| 251 | macro_for_each (ms->file->table, print_macro_callback, name); |
| 252 | else |
| 253 | { |
| 254 | struct macro_definition *d; |
| 255 | |
| 256 | d = macro_lookup_definition (ms->file, ms->line, name); |
| 257 | if (d) |
| 258 | { |
| 259 | int line; |
| 260 | struct macro_source_file *file |
| 261 | = macro_definition_location (ms->file, ms->line, name, &line); |
| 262 | |
| 263 | print_macro_definition (name, d, file, line); |
| 264 | } |
| 265 | else |
| 266 | { |
| 267 | fprintf_filtered (gdb_stdout, |
| 268 | "The symbol `%s' has no definition as a C/C++" |
| 269 | " preprocessor macro\n" |
| 270 | "at ", name); |
| 271 | show_pp_source_pos (gdb_stdout, ms->file, ms->line); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | do_cleanups (cleanup_chain); |
| 276 | } |
| 277 | |
| 278 | /* Implementation of the "info macros" command. */ |
| 279 | static void |
| 280 | info_macros_command (char *args, int from_tty) |
| 281 | { |
| 282 | struct macro_scope *ms = NULL; |
| 283 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); |
| 284 | |
| 285 | if (args == NULL) |
| 286 | ms = default_macro_scope (); |
| 287 | else |
| 288 | { |
| 289 | struct symtabs_and_lines sals = |
| 290 | decode_line_with_current_source (args, 0); |
| 291 | |
| 292 | if (sals.nelts) |
| 293 | ms = sal_macro_scope (sals.sals[0]); |
| 294 | } |
| 295 | |
| 296 | if (! ms || ! ms->file || ! ms->file->table) |
| 297 | macro_inform_no_debuginfo (); |
| 298 | else |
| 299 | macro_for_each_in_scope (ms->file, ms->line, print_macro_callback, NULL); |
| 300 | |
| 301 | do_cleanups (cleanup_chain); |
| 302 | } |
| 303 | |
| 304 | \f |
| 305 | /* User-defined macros. */ |
| 306 | |
| 307 | static void |
| 308 | skip_ws (char **expp) |
| 309 | { |
| 310 | while (macro_is_whitespace (**expp)) |
| 311 | ++*expp; |
| 312 | } |
| 313 | |
| 314 | /* Try to find the bounds of an identifier. If an identifier is |
| 315 | found, returns a newly allocated string; otherwise returns NULL. |
| 316 | EXPP is a pointer to an input string; it is updated to point to the |
| 317 | text following the identifier. If IS_PARAMETER is true, this |
| 318 | function will also allow "..." forms as used in varargs macro |
| 319 | parameters. */ |
| 320 | |
| 321 | static char * |
| 322 | extract_identifier (char **expp, int is_parameter) |
| 323 | { |
| 324 | char *result; |
| 325 | char *p = *expp; |
| 326 | unsigned int len; |
| 327 | |
| 328 | if (is_parameter && startswith (p, "...")) |
| 329 | { |
| 330 | /* Ok. */ |
| 331 | } |
| 332 | else |
| 333 | { |
| 334 | if (! *p || ! macro_is_identifier_nondigit (*p)) |
| 335 | return NULL; |
| 336 | for (++p; |
| 337 | *p && (macro_is_identifier_nondigit (*p) || macro_is_digit (*p)); |
| 338 | ++p) |
| 339 | ; |
| 340 | } |
| 341 | |
| 342 | if (is_parameter && startswith (p, "...")) |
| 343 | p += 3; |
| 344 | |
| 345 | len = p - *expp; |
| 346 | result = (char *) xmalloc (len + 1); |
| 347 | memcpy (result, *expp, len); |
| 348 | result[len] = '\0'; |
| 349 | *expp += len; |
| 350 | return result; |
| 351 | } |
| 352 | |
| 353 | /* Helper function to clean up a temporarily-constructed macro object. |
| 354 | This assumes that the contents were all allocated with xmalloc. */ |
| 355 | static void |
| 356 | free_macro_definition_ptr (void *ptr) |
| 357 | { |
| 358 | int i; |
| 359 | struct macro_definition *loc = (struct macro_definition *) ptr; |
| 360 | |
| 361 | for (i = 0; i < loc->argc; ++i) |
| 362 | xfree ((char *) loc->argv[i]); |
| 363 | xfree ((char *) loc->argv); |
| 364 | /* Note that the 'replacement' field is not allocated. */ |
| 365 | } |
| 366 | |
| 367 | static void |
| 368 | macro_define_command (char *exp, int from_tty) |
| 369 | { |
| 370 | struct macro_definition new_macro; |
| 371 | char *name = NULL; |
| 372 | struct cleanup *cleanup_chain; |
| 373 | |
| 374 | if (!exp) |
| 375 | error (_("usage: macro define NAME[(ARGUMENT-LIST)] [REPLACEMENT-LIST]")); |
| 376 | |
| 377 | cleanup_chain = make_cleanup (free_macro_definition_ptr, &new_macro); |
| 378 | make_cleanup (free_current_contents, &name); |
| 379 | |
| 380 | memset (&new_macro, 0, sizeof (struct macro_definition)); |
| 381 | |
| 382 | skip_ws (&exp); |
| 383 | name = extract_identifier (&exp, 0); |
| 384 | if (! name) |
| 385 | error (_("Invalid macro name.")); |
| 386 | if (*exp == '(') |
| 387 | { |
| 388 | /* Function-like macro. */ |
| 389 | int alloced = 5; |
| 390 | char **argv = XNEWVEC (char *, alloced); |
| 391 | |
| 392 | new_macro.kind = macro_function_like; |
| 393 | new_macro.argc = 0; |
| 394 | new_macro.argv = (const char * const *) argv; |
| 395 | |
| 396 | /* Skip the '(' and whitespace. */ |
| 397 | ++exp; |
| 398 | skip_ws (&exp); |
| 399 | |
| 400 | while (*exp != ')') |
| 401 | { |
| 402 | int i; |
| 403 | |
| 404 | if (new_macro.argc == alloced) |
| 405 | { |
| 406 | alloced *= 2; |
| 407 | argv = (char **) xrealloc (argv, alloced * sizeof (char *)); |
| 408 | /* Must update new_macro as well... */ |
| 409 | new_macro.argv = (const char * const *) argv; |
| 410 | } |
| 411 | argv[new_macro.argc] = extract_identifier (&exp, 1); |
| 412 | if (! argv[new_macro.argc]) |
| 413 | error (_("Macro is missing an argument.")); |
| 414 | ++new_macro.argc; |
| 415 | |
| 416 | for (i = new_macro.argc - 2; i >= 0; --i) |
| 417 | { |
| 418 | if (! strcmp (argv[i], argv[new_macro.argc - 1])) |
| 419 | error (_("Two macro arguments with identical names.")); |
| 420 | } |
| 421 | |
| 422 | skip_ws (&exp); |
| 423 | if (*exp == ',') |
| 424 | { |
| 425 | ++exp; |
| 426 | skip_ws (&exp); |
| 427 | } |
| 428 | else if (*exp != ')') |
| 429 | error (_("',' or ')' expected at end of macro arguments.")); |
| 430 | } |
| 431 | /* Skip the closing paren. */ |
| 432 | ++exp; |
| 433 | skip_ws (&exp); |
| 434 | |
| 435 | macro_define_function (macro_main (macro_user_macros), -1, name, |
| 436 | new_macro.argc, (const char **) new_macro.argv, |
| 437 | exp); |
| 438 | } |
| 439 | else |
| 440 | { |
| 441 | skip_ws (&exp); |
| 442 | macro_define_object (macro_main (macro_user_macros), -1, name, exp); |
| 443 | } |
| 444 | |
| 445 | do_cleanups (cleanup_chain); |
| 446 | } |
| 447 | |
| 448 | |
| 449 | static void |
| 450 | macro_undef_command (char *exp, int from_tty) |
| 451 | { |
| 452 | char *name; |
| 453 | |
| 454 | if (!exp) |
| 455 | error (_("usage: macro undef NAME")); |
| 456 | |
| 457 | skip_ws (&exp); |
| 458 | name = extract_identifier (&exp, 0); |
| 459 | if (! name) |
| 460 | error (_("Invalid macro name.")); |
| 461 | macro_undef (macro_main (macro_user_macros), -1, name); |
| 462 | xfree (name); |
| 463 | } |
| 464 | |
| 465 | |
| 466 | static void |
| 467 | print_one_macro (const char *name, const struct macro_definition *macro, |
| 468 | struct macro_source_file *source, int line, |
| 469 | void *ignore) |
| 470 | { |
| 471 | fprintf_filtered (gdb_stdout, "macro define %s", name); |
| 472 | if (macro->kind == macro_function_like) |
| 473 | { |
| 474 | int i; |
| 475 | |
| 476 | fprintf_filtered (gdb_stdout, "("); |
| 477 | for (i = 0; i < macro->argc; ++i) |
| 478 | fprintf_filtered (gdb_stdout, "%s%s", (i > 0) ? ", " : "", |
| 479 | macro->argv[i]); |
| 480 | fprintf_filtered (gdb_stdout, ")"); |
| 481 | } |
| 482 | fprintf_filtered (gdb_stdout, " %s\n", macro->replacement); |
| 483 | } |
| 484 | |
| 485 | |
| 486 | static void |
| 487 | macro_list_command (char *exp, int from_tty) |
| 488 | { |
| 489 | macro_for_each (macro_user_macros, print_one_macro, NULL); |
| 490 | } |
| 491 | |
| 492 | \f |
| 493 | /* Initializing the `macrocmd' module. */ |
| 494 | |
| 495 | extern initialize_file_ftype _initialize_macrocmd; /* -Wmissing-prototypes */ |
| 496 | |
| 497 | void |
| 498 | _initialize_macrocmd (void) |
| 499 | { |
| 500 | /* We introduce a new command prefix, `macro', under which we'll put |
| 501 | the various commands for working with preprocessor macros. */ |
| 502 | add_prefix_cmd ("macro", class_info, macro_command, |
| 503 | _("Prefix for commands dealing with C preprocessor macros."), |
| 504 | ¯olist, "macro ", 0, &cmdlist); |
| 505 | |
| 506 | add_cmd ("expand", no_class, macro_expand_command, _("\ |
| 507 | Fully expand any C/C++ preprocessor macro invocations in EXPRESSION.\n\ |
| 508 | Show the expanded expression."), |
| 509 | ¯olist); |
| 510 | add_alias_cmd ("exp", "expand", no_class, 1, ¯olist); |
| 511 | add_cmd ("expand-once", no_class, macro_expand_once_command, _("\ |
| 512 | Expand C/C++ preprocessor macro invocations appearing directly in EXPRESSION.\n\ |
| 513 | Show the expanded expression.\n\ |
| 514 | \n\ |
| 515 | This command differs from `macro expand' in that it only expands macro\n\ |
| 516 | invocations that appear directly in EXPRESSION; if expanding a macro\n\ |
| 517 | introduces further macro invocations, those are left unexpanded.\n\ |
| 518 | \n\ |
| 519 | `macro expand-once' helps you see how a particular macro expands,\n\ |
| 520 | whereas `macro expand' shows you how all the macros involved in an\n\ |
| 521 | expression work together to yield a pre-processed expression."), |
| 522 | ¯olist); |
| 523 | add_alias_cmd ("exp1", "expand-once", no_class, 1, ¯olist); |
| 524 | |
| 525 | add_info ("macro", info_macro_command, |
| 526 | _("Show the definition of MACRO, and it's source location.\n\ |
| 527 | Usage: info macro [-a|-all] [--] MACRO\n\ |
| 528 | Options: \n\ |
| 529 | -a, --all Output all definitions of MACRO in the current compilation\ |
| 530 | unit.\n\ |
| 531 | -- Specify the end of arguments and the beginning of the MACRO.")); |
| 532 | |
| 533 | add_info ("macros", info_macros_command, |
| 534 | _("Show the definitions of all macros at LINESPEC, or the current \ |
| 535 | source location.\n\ |
| 536 | Usage: info macros [LINESPEC]")); |
| 537 | |
| 538 | add_cmd ("define", no_class, macro_define_command, _("\ |
| 539 | Define a new C/C++ preprocessor macro.\n\ |
| 540 | The GDB command `macro define DEFINITION' is equivalent to placing a\n\ |
| 541 | preprocessor directive of the form `#define DEFINITION' such that the\n\ |
| 542 | definition is visible in all the inferior's source files.\n\ |
| 543 | For example:\n\ |
| 544 | (gdb) macro define PI (3.1415926)\n\ |
| 545 | (gdb) macro define MIN(x,y) ((x) < (y) ? (x) : (y))"), |
| 546 | ¯olist); |
| 547 | |
| 548 | add_cmd ("undef", no_class, macro_undef_command, _("\ |
| 549 | Remove the definition of the C/C++ preprocessor macro with the given name."), |
| 550 | ¯olist); |
| 551 | |
| 552 | add_cmd ("list", no_class, macro_list_command, |
| 553 | _("List all the macros defined using the `macro define' command."), |
| 554 | ¯olist); |
| 555 | } |