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6821892e | 1 | /* C preprocessor macro expansion commands for GDB. |
7b6bb8da JB |
2 | Copyright (C) 2002, 2007, 2008, 2009, 2010, 2011 |
3 | Free Software Foundation, Inc. | |
6821892e JB |
4 | Contributed by Red Hat, Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
6821892e JB |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
6821892e JB |
20 | |
21 | ||
22 | #include "defs.h" | |
23 | #include "macrotab.h" | |
24 | #include "macroexp.h" | |
25 | #include "macroscope.h" | |
71eba9c2 | 26 | #include "cli/cli-utils.h" |
6821892e JB |
27 | #include "command.h" |
28 | #include "gdbcmd.h" | |
d7d9f01e | 29 | #include "gdb_string.h" |
6821892e JB |
30 | |
31 | \f | |
32 | /* The `macro' prefix command. */ | |
33 | ||
34 | static struct cmd_list_element *macrolist; | |
35 | ||
36 | static void | |
37 | macro_command (char *arg, int from_tty) | |
38 | { | |
39 | printf_unfiltered | |
40 | ("\"macro\" must be followed by the name of a macro command.\n"); | |
41 | help_list (macrolist, "macro ", -1, gdb_stdout); | |
42 | } | |
43 | ||
44 | ||
45 | \f | |
46 | /* Macro expansion commands. */ | |
47 | ||
48 | ||
71eba9c2 | 49 | /* Prints an informational message regarding the lack of macro information. */ |
50 | static void macro_inform_no_debuginfo() | |
51 | { | |
52 | fputs_filtered ("GDB has no preprocessor macro information for " | |
53 | "that code.", | |
54 | gdb_stdout); | |
55 | } | |
56 | ||
6821892e JB |
57 | static void |
58 | macro_expand_command (char *exp, int from_tty) | |
59 | { | |
60 | struct macro_scope *ms = NULL; | |
61 | char *expanded = NULL; | |
62 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
b8d56208 | 63 | |
6821892e JB |
64 | make_cleanup (free_current_contents, &expanded); |
65 | ||
66 | /* You know, when the user doesn't specify any expression, it would be | |
67 | really cool if this defaulted to the last expression evaluated. | |
68 | Then it would be easy to ask, "Hey, what did I just evaluate?" But | |
69 | at the moment, the `print' commands don't save the last expression | |
70 | evaluated, just its value. */ | |
71 | if (! exp || ! *exp) | |
8a3fe4f8 | 72 | error (_("You must follow the `macro expand' command with the" |
6821892e | 73 | " expression you\n" |
8a3fe4f8 | 74 | "want to expand.")); |
6821892e JB |
75 | |
76 | ms = default_macro_scope (); | |
77 | if (ms) | |
78 | { | |
79 | expanded = macro_expand (exp, standard_macro_lookup, ms); | |
80 | fputs_filtered ("expands to: ", gdb_stdout); | |
81 | fputs_filtered (expanded, gdb_stdout); | |
82 | fputs_filtered ("\n", gdb_stdout); | |
83 | } | |
84 | else | |
71eba9c2 | 85 | macro_inform_no_debuginfo (); |
6821892e JB |
86 | |
87 | do_cleanups (cleanup_chain); | |
88 | return; | |
89 | } | |
90 | ||
91 | ||
92 | static void | |
93 | macro_expand_once_command (char *exp, int from_tty) | |
94 | { | |
95 | struct macro_scope *ms = NULL; | |
96 | char *expanded = NULL; | |
97 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
98 | make_cleanup (free_current_contents, &expanded); | |
99 | ||
100 | /* You know, when the user doesn't specify any expression, it would be | |
101 | really cool if this defaulted to the last expression evaluated. | |
102 | And it should set the once-expanded text as the new `last | |
103 | expression'. That way, you could just hit return over and over and | |
104 | see the expression expanded one level at a time. */ | |
105 | if (! exp || ! *exp) | |
8a3fe4f8 | 106 | error (_("You must follow the `macro expand-once' command with" |
6821892e | 107 | " the expression\n" |
8a3fe4f8 | 108 | "you want to expand.")); |
6821892e JB |
109 | |
110 | ms = default_macro_scope (); | |
111 | if (ms) | |
112 | { | |
113 | expanded = macro_expand_once (exp, standard_macro_lookup, ms); | |
114 | fputs_filtered ("expands to: ", gdb_stdout); | |
115 | fputs_filtered (expanded, gdb_stdout); | |
116 | fputs_filtered ("\n", gdb_stdout); | |
117 | } | |
118 | else | |
71eba9c2 | 119 | macro_inform_no_debuginfo (); |
6821892e JB |
120 | |
121 | do_cleanups (cleanup_chain); | |
122 | return; | |
123 | } | |
124 | ||
9b158ba0 | 125 | /* Outputs the include path of a macro starting at FILE and LINE to STREAM. |
6821892e | 126 | |
9b158ba0 | 127 | Care should be taken that this function does not cause any lookups into |
128 | the splay tree so that it can be safely used while iterating. */ | |
6821892e JB |
129 | static void |
130 | show_pp_source_pos (struct ui_file *stream, | |
131 | struct macro_source_file *file, | |
132 | int line) | |
133 | { | |
134 | fprintf_filtered (stream, "%s:%d\n", file->filename, line); | |
135 | ||
136 | while (file->included_by) | |
137 | { | |
138 | fprintf_filtered (gdb_stdout, " included at %s:%d\n", | |
139 | file->included_by->filename, | |
140 | file->included_at_line); | |
141 | file = file->included_by; | |
142 | } | |
143 | } | |
144 | ||
9b158ba0 | 145 | /* Outputs a macro for human consumption, detailing the include path |
146 | and macro definition. NAME is the name of the macro. | |
147 | D the definition. FILE the start of the include path, and LINE the | |
148 | line number in FILE. | |
6821892e | 149 | |
9b158ba0 | 150 | Care should be taken that this function does not cause any lookups into |
151 | the splay tree so that it can be safely used while iterating. */ | |
6821892e | 152 | static void |
9b158ba0 | 153 | print_macro_definition (const char *name, |
154 | const struct macro_definition *d, | |
155 | struct macro_source_file *file, | |
156 | int line) | |
6821892e | 157 | { |
6821892e JB |
158 | fprintf_filtered (gdb_stdout, "Defined at "); |
159 | show_pp_source_pos (gdb_stdout, file, line); | |
9b158ba0 | 160 | |
484086b7 JK |
161 | if (line != 0) |
162 | fprintf_filtered (gdb_stdout, "#define %s", name); | |
163 | else | |
164 | fprintf_filtered (gdb_stdout, "-D%s", name); | |
9b158ba0 | 165 | |
6821892e JB |
166 | if (d->kind == macro_function_like) |
167 | { | |
168 | int i; | |
169 | ||
170 | fputs_filtered ("(", gdb_stdout); | |
171 | for (i = 0; i < d->argc; i++) | |
172 | { | |
173 | fputs_filtered (d->argv[i], gdb_stdout); | |
174 | if (i + 1 < d->argc) | |
175 | fputs_filtered (", ", gdb_stdout); | |
176 | } | |
177 | fputs_filtered (")", gdb_stdout); | |
178 | } | |
9b158ba0 | 179 | |
484086b7 JK |
180 | if (line != 0) |
181 | fprintf_filtered (gdb_stdout, " %s\n", d->replacement); | |
182 | else | |
183 | fprintf_filtered (gdb_stdout, "=%s\n", d->replacement); | |
9b158ba0 | 184 | } |
185 | ||
9b158ba0 | 186 | /* A callback function for usage with macro_for_each and friends. |
187 | If USER_DATA is null all macros will be printed. | |
188 | Otherwise USER_DATA is considered to be a string, printing | |
189 | only macros who's NAME matches USER_DATA. Other arguments are | |
190 | routed to print_macro_definition. */ | |
191 | static void | |
192 | print_macro_callback (const char *name, const struct macro_definition *macro, | |
193 | struct macro_source_file *source, int line, | |
194 | void *user_data) | |
195 | { | |
196 | if (! user_data || strcmp (user_data, name) == 0) | |
197 | print_macro_definition (name, macro, source, line); | |
198 | } | |
199 | ||
71eba9c2 | 200 | /* The implementation of the `info macro' command. */ |
9b158ba0 | 201 | static void |
71eba9c2 | 202 | info_macro_command (char *args, int from_tty) |
9b158ba0 | 203 | { |
204 | struct macro_scope *ms = NULL; | |
71eba9c2 | 205 | struct cleanup *cleanup_chain; |
206 | char *name; | |
207 | int show_all_macros_named = 0; | |
208 | char *arg_start = args; | |
209 | int processing_args = 1; | |
210 | ||
211 | while (processing_args | |
212 | && arg_start && *arg_start == '-' && *arg_start != '\0') | |
213 | { | |
214 | char *p = skip_to_space (arg_start); | |
215 | ||
216 | if (strncmp (arg_start, "-a", p - arg_start) == 0 | |
217 | || strncmp (arg_start, "-all", p - arg_start) == 0) | |
218 | show_all_macros_named = 1; | |
219 | else if (strncmp (arg_start, "--", p - arg_start) == 0) | |
220 | /* Our macro support seems rather C specific but this would | |
221 | seem necessary for languages allowing - in macro names. | |
222 | e.g. Scheme's (defmacro ->foo () "bar\n") */ | |
223 | processing_args = 0; | |
224 | else | |
225 | { | |
226 | /* Relies on modified 'args' not making it in to history */ | |
227 | *p = '\0'; | |
228 | error (_("Unrecognized option '%s' to info macro command. " | |
229 | "Try \"help info macro\"."), arg_start); | |
230 | } | |
231 | ||
232 | arg_start = skip_spaces (p); | |
233 | } | |
234 | ||
235 | name = arg_start; | |
9b158ba0 | 236 | |
237 | if (! name || ! *name) | |
71eba9c2 | 238 | error (_("You must follow the `info macro' command with the name" |
239 | " of the macro\n" | |
240 | "whose definition you want to see.")); | |
9b158ba0 | 241 | |
242 | ms = default_macro_scope (); | |
71eba9c2 | 243 | cleanup_chain = make_cleanup (free_current_contents, &ms); |
9b158ba0 | 244 | |
71eba9c2 | 245 | if (! ms) |
246 | macro_inform_no_debuginfo (); | |
247 | else if (show_all_macros_named) | |
248 | macro_for_each (ms->file->table, print_macro_callback, name); | |
249 | else | |
250 | { | |
251 | struct macro_definition *d; | |
252 | ||
253 | d = macro_lookup_definition (ms->file, ms->line, name); | |
254 | if (d) | |
255 | { | |
256 | int line; | |
257 | struct macro_source_file *file | |
258 | = macro_definition_location (ms->file, ms->line, name, &line); | |
259 | ||
260 | print_macro_definition (name, d, file, line); | |
261 | } | |
262 | else | |
263 | { | |
264 | fprintf_filtered (gdb_stdout, | |
265 | "The symbol `%s' has no definition as a C/C++" | |
266 | " preprocessor macro\n" | |
267 | "at ", name); | |
268 | show_pp_source_pos (gdb_stdout, ms->file, ms->line); | |
269 | } | |
270 | } | |
9b158ba0 | 271 | |
9b158ba0 | 272 | do_cleanups (cleanup_chain); |
273 | } | |
274 | ||
275 | /* Implementation of the "info macros" command. */ | |
276 | static void | |
277 | info_macros_command (char *args, int from_tty) | |
278 | { | |
279 | struct macro_scope *ms = NULL; | |
280 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
281 | ||
282 | if (args == NULL) | |
283 | ms = default_macro_scope (); | |
284 | else | |
285 | { | |
286 | struct symtabs_and_lines sals = decode_line_spec (args, 0); | |
287 | ||
288 | if (sals.nelts) | |
289 | ms = sal_macro_scope (sals.sals[0]); | |
290 | } | |
291 | ||
292 | if (! ms || ! ms->file || ! ms->file->table) | |
71eba9c2 | 293 | macro_inform_no_debuginfo (); |
294 | else | |
295 | macro_for_each_in_scope (ms->file, ms->line, print_macro_callback, NULL); | |
9b158ba0 | 296 | |
9b158ba0 | 297 | do_cleanups (cleanup_chain); |
298 | } | |
6821892e JB |
299 | |
300 | \f | |
301 | /* User-defined macros. */ | |
302 | ||
d7d9f01e TT |
303 | static void |
304 | skip_ws (char **expp) | |
305 | { | |
306 | while (macro_is_whitespace (**expp)) | |
307 | ++*expp; | |
308 | } | |
309 | ||
2fae03e8 TT |
310 | /* Try to find the bounds of an identifier. If an identifier is |
311 | found, returns a newly allocated string; otherwise returns NULL. | |
312 | EXPP is a pointer to an input string; it is updated to point to the | |
313 | text following the identifier. If IS_PARAMETER is true, this | |
314 | function will also allow "..." forms as used in varargs macro | |
315 | parameters. */ | |
316 | ||
d7d9f01e | 317 | static char * |
2fae03e8 | 318 | extract_identifier (char **expp, int is_parameter) |
d7d9f01e TT |
319 | { |
320 | char *result; | |
321 | char *p = *expp; | |
322 | unsigned int len; | |
2fae03e8 TT |
323 | |
324 | if (is_parameter && !strncmp (p, "...", 3)) | |
325 | { | |
326 | /* Ok. */ | |
327 | } | |
328 | else | |
329 | { | |
330 | if (! *p || ! macro_is_identifier_nondigit (*p)) | |
331 | return NULL; | |
332 | for (++p; | |
333 | *p && (macro_is_identifier_nondigit (*p) || macro_is_digit (*p)); | |
334 | ++p) | |
335 | ; | |
336 | } | |
337 | ||
338 | if (is_parameter && !strncmp (p, "...", 3)) | |
339 | p += 3; | |
340 | ||
d7d9f01e TT |
341 | len = p - *expp; |
342 | result = (char *) xmalloc (len + 1); | |
343 | memcpy (result, *expp, len); | |
344 | result[len] = '\0'; | |
345 | *expp += len; | |
346 | return result; | |
347 | } | |
348 | ||
349 | /* Helper function to clean up a temporarily-constructed macro object. | |
350 | This assumes that the contents were all allocated with xmalloc. */ | |
351 | static void | |
352 | free_macro_definition_ptr (void *ptr) | |
353 | { | |
354 | int i; | |
355 | struct macro_definition *loc = (struct macro_definition *) ptr; | |
b8d56208 | 356 | |
d7d9f01e TT |
357 | for (i = 0; i < loc->argc; ++i) |
358 | xfree ((char *) loc->argv[i]); | |
359 | xfree ((char *) loc->argv); | |
360 | /* Note that the 'replacement' field is not allocated. */ | |
361 | } | |
6821892e JB |
362 | |
363 | static void | |
364 | macro_define_command (char *exp, int from_tty) | |
365 | { | |
d7d9f01e TT |
366 | struct macro_definition new_macro; |
367 | char *name = NULL; | |
886a217c TT |
368 | struct cleanup *cleanup_chain; |
369 | ||
370 | if (!exp) | |
371 | error (_("usage: macro define NAME[(ARGUMENT-LIST)] [REPLACEMENT-LIST]")); | |
372 | ||
373 | cleanup_chain = make_cleanup (free_macro_definition_ptr, &new_macro); | |
d7d9f01e TT |
374 | make_cleanup (free_current_contents, &name); |
375 | ||
376 | memset (&new_macro, 0, sizeof (struct macro_definition)); | |
377 | ||
378 | skip_ws (&exp); | |
2fae03e8 | 379 | name = extract_identifier (&exp, 0); |
d7d9f01e TT |
380 | if (! name) |
381 | error (_("Invalid macro name.")); | |
382 | if (*exp == '(') | |
383 | { | |
384 | /* Function-like macro. */ | |
385 | int alloced = 5; | |
386 | char **argv = (char **) xmalloc (alloced * sizeof (char *)); | |
387 | ||
388 | new_macro.kind = macro_function_like; | |
389 | new_macro.argc = 0; | |
390 | new_macro.argv = (const char * const *) argv; | |
391 | ||
392 | /* Skip the '(' and whitespace. */ | |
393 | ++exp; | |
394 | skip_ws (&exp); | |
395 | ||
396 | while (*exp != ')') | |
397 | { | |
398 | int i; | |
399 | ||
400 | if (new_macro.argc == alloced) | |
401 | { | |
402 | alloced *= 2; | |
403 | argv = (char **) xrealloc (argv, alloced * sizeof (char *)); | |
025bb325 | 404 | /* Must update new_macro as well... */ |
d7d9f01e TT |
405 | new_macro.argv = (const char * const *) argv; |
406 | } | |
2fae03e8 | 407 | argv[new_macro.argc] = extract_identifier (&exp, 1); |
d7d9f01e TT |
408 | if (! argv[new_macro.argc]) |
409 | error (_("Macro is missing an argument.")); | |
410 | ++new_macro.argc; | |
411 | ||
412 | for (i = new_macro.argc - 2; i >= 0; --i) | |
413 | { | |
414 | if (! strcmp (argv[i], argv[new_macro.argc - 1])) | |
415 | error (_("Two macro arguments with identical names.")); | |
416 | } | |
417 | ||
418 | skip_ws (&exp); | |
419 | if (*exp == ',') | |
420 | { | |
421 | ++exp; | |
422 | skip_ws (&exp); | |
423 | } | |
424 | else if (*exp != ')') | |
425 | error (_("',' or ')' expected at end of macro arguments.")); | |
426 | } | |
427 | /* Skip the closing paren. */ | |
428 | ++exp; | |
cc704ebe | 429 | skip_ws (&exp); |
d7d9f01e TT |
430 | |
431 | macro_define_function (macro_main (macro_user_macros), -1, name, | |
432 | new_macro.argc, (const char **) new_macro.argv, | |
433 | exp); | |
434 | } | |
435 | else | |
cc704ebe TT |
436 | { |
437 | skip_ws (&exp); | |
438 | macro_define_object (macro_main (macro_user_macros), -1, name, exp); | |
439 | } | |
d7d9f01e TT |
440 | |
441 | do_cleanups (cleanup_chain); | |
6821892e JB |
442 | } |
443 | ||
444 | ||
445 | static void | |
446 | macro_undef_command (char *exp, int from_tty) | |
447 | { | |
d7d9f01e | 448 | char *name; |
886a217c TT |
449 | |
450 | if (!exp) | |
451 | error (_("usage: macro undef NAME")); | |
452 | ||
d7d9f01e | 453 | skip_ws (&exp); |
2fae03e8 | 454 | name = extract_identifier (&exp, 0); |
d7d9f01e TT |
455 | if (! name) |
456 | error (_("Invalid macro name.")); | |
457 | macro_undef (macro_main (macro_user_macros), -1, name); | |
458 | xfree (name); | |
459 | } | |
460 | ||
461 | ||
462 | static void | |
9a044a89 | 463 | print_one_macro (const char *name, const struct macro_definition *macro, |
9b158ba0 | 464 | struct macro_source_file *source, int line, |
9a044a89 | 465 | void *ignore) |
d7d9f01e TT |
466 | { |
467 | fprintf_filtered (gdb_stdout, "macro define %s", name); | |
468 | if (macro->kind == macro_function_like) | |
469 | { | |
470 | int i; | |
b8d56208 | 471 | |
d7d9f01e TT |
472 | fprintf_filtered (gdb_stdout, "("); |
473 | for (i = 0; i < macro->argc; ++i) | |
474 | fprintf_filtered (gdb_stdout, "%s%s", (i > 0) ? ", " : "", | |
475 | macro->argv[i]); | |
476 | fprintf_filtered (gdb_stdout, ")"); | |
477 | } | |
cc704ebe | 478 | fprintf_filtered (gdb_stdout, " %s\n", macro->replacement); |
6821892e JB |
479 | } |
480 | ||
481 | ||
482 | static void | |
483 | macro_list_command (char *exp, int from_tty) | |
484 | { | |
9a044a89 | 485 | macro_for_each (macro_user_macros, print_one_macro, NULL); |
6821892e JB |
486 | } |
487 | ||
6821892e JB |
488 | \f |
489 | /* Initializing the `macrocmd' module. */ | |
490 | ||
a78f21af | 491 | extern initialize_file_ftype _initialize_macrocmd; /* -Wmissing-prototypes */ |
b9362cc7 | 492 | |
6821892e JB |
493 | void |
494 | _initialize_macrocmd (void) | |
495 | { | |
6821892e JB |
496 | /* We introduce a new command prefix, `macro', under which we'll put |
497 | the various commands for working with preprocessor macros. */ | |
1bedd215 AC |
498 | add_prefix_cmd ("macro", class_info, macro_command, |
499 | _("Prefix for commands dealing with C preprocessor macros."), | |
500 | ¯olist, "macro ", 0, &cmdlist); | |
6821892e | 501 | |
1a966eab AC |
502 | add_cmd ("expand", no_class, macro_expand_command, _("\ |
503 | Fully expand any C/C++ preprocessor macro invocations in EXPRESSION.\n\ | |
504 | Show the expanded expression."), | |
505 | ¯olist); | |
6821892e | 506 | add_alias_cmd ("exp", "expand", no_class, 1, ¯olist); |
1a966eab AC |
507 | add_cmd ("expand-once", no_class, macro_expand_once_command, _("\ |
508 | Expand C/C++ preprocessor macro invocations appearing directly in EXPRESSION.\n\ | |
509 | Show the expanded expression.\n\ | |
510 | \n\ | |
511 | This command differs from `macro expand' in that it only expands macro\n\ | |
512 | invocations that appear directly in EXPRESSION; if expanding a macro\n\ | |
513 | introduces further macro invocations, those are left unexpanded.\n\ | |
514 | \n\ | |
515 | `macro expand-once' helps you see how a particular macro expands,\n\ | |
516 | whereas `macro expand' shows you how all the macros involved in an\n\ | |
517 | expression work together to yield a pre-processed expression."), | |
518 | ¯olist); | |
6821892e JB |
519 | add_alias_cmd ("exp1", "expand-once", no_class, 1, ¯olist); |
520 | ||
1a966eab | 521 | add_cmd ("macro", no_class, info_macro_command, |
71eba9c2 | 522 | _("Show the definition of MACRO, and it's source location.\n\ |
523 | Usage: info macro [-a|-all] [--] MACRO\n\ | |
524 | Options: \n\ | |
525 | -a, --all Output all definitions of MACRO in the current compilation\ | |
526 | unit.\n\ | |
527 | -- Specify the end of arguments and the beginning of the MACRO."), | |
528 | ||
1a966eab AC |
529 | &infolist); |
530 | ||
9b158ba0 | 531 | add_cmd ("macros", no_class, info_macros_command, |
532 | _("Show the definitions of all macros at LINESPEC, or the current \ | |
533 | source location.\n\ | |
534 | Usage: info macros [LINESPEC]"), | |
535 | &infolist); | |
536 | ||
1a966eab AC |
537 | add_cmd ("define", no_class, macro_define_command, _("\ |
538 | Define a new C/C++ preprocessor macro.\n\ | |
539 | The GDB command `macro define DEFINITION' is equivalent to placing a\n\ | |
540 | preprocessor directive of the form `#define DEFINITION' such that the\n\ | |
541 | definition is visible in all the inferior's source files.\n\ | |
542 | For example:\n\ | |
543 | (gdb) macro define PI (3.1415926)\n\ | |
544 | (gdb) macro define MIN(x,y) ((x) < (y) ? (x) : (y))"), | |
545 | ¯olist); | |
546 | ||
547 | add_cmd ("undef", no_class, macro_undef_command, _("\ | |
548 | Remove the definition of the C/C++ preprocessor macro with the given name."), | |
549 | ¯olist); | |
550 | ||
551 | add_cmd ("list", no_class, macro_list_command, | |
552 | _("List all the macros defined using the `macro define' command."), | |
553 | ¯olist); | |
6821892e | 554 | } |