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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" | |
26 | #include "command.h" | |
27 | #include "gdbcmd.h" | |
d7d9f01e | 28 | #include "gdb_string.h" |
6821892e JB |
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 ", -1, gdb_stdout); | |
41 | } | |
42 | ||
43 | ||
44 | \f | |
45 | /* Macro expansion commands. */ | |
46 | ||
47 | ||
48 | static void | |
49 | macro_expand_command (char *exp, int from_tty) | |
50 | { | |
51 | struct macro_scope *ms = NULL; | |
52 | char *expanded = NULL; | |
53 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
b8d56208 | 54 | |
6821892e JB |
55 | make_cleanup (free_current_contents, &expanded); |
56 | ||
57 | /* You know, when the user doesn't specify any expression, it would be | |
58 | really cool if this defaulted to the last expression evaluated. | |
59 | Then it would be easy to ask, "Hey, what did I just evaluate?" But | |
60 | at the moment, the `print' commands don't save the last expression | |
61 | evaluated, just its value. */ | |
62 | if (! exp || ! *exp) | |
8a3fe4f8 | 63 | error (_("You must follow the `macro expand' command with the" |
6821892e | 64 | " expression you\n" |
8a3fe4f8 | 65 | "want to expand.")); |
6821892e JB |
66 | |
67 | ms = default_macro_scope (); | |
68 | if (ms) | |
69 | { | |
70 | expanded = macro_expand (exp, standard_macro_lookup, ms); | |
71 | fputs_filtered ("expands to: ", gdb_stdout); | |
72 | fputs_filtered (expanded, gdb_stdout); | |
73 | fputs_filtered ("\n", gdb_stdout); | |
74 | } | |
75 | else | |
76 | fputs_filtered ("GDB has no preprocessor macro information for " | |
77 | "that code.\n", | |
78 | gdb_stdout); | |
79 | ||
80 | do_cleanups (cleanup_chain); | |
81 | return; | |
82 | } | |
83 | ||
84 | ||
85 | static void | |
86 | macro_expand_once_command (char *exp, int from_tty) | |
87 | { | |
88 | struct macro_scope *ms = NULL; | |
89 | char *expanded = NULL; | |
90 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
91 | make_cleanup (free_current_contents, &expanded); | |
92 | ||
93 | /* You know, when the user doesn't specify any expression, it would be | |
94 | really cool if this defaulted to the last expression evaluated. | |
95 | And it should set the once-expanded text as the new `last | |
96 | expression'. That way, you could just hit return over and over and | |
97 | see the expression expanded one level at a time. */ | |
98 | if (! exp || ! *exp) | |
8a3fe4f8 | 99 | error (_("You must follow the `macro expand-once' command with" |
6821892e | 100 | " the expression\n" |
8a3fe4f8 | 101 | "you want to expand.")); |
6821892e JB |
102 | |
103 | ms = default_macro_scope (); | |
104 | if (ms) | |
105 | { | |
106 | expanded = macro_expand_once (exp, standard_macro_lookup, ms); | |
107 | fputs_filtered ("expands to: ", gdb_stdout); | |
108 | fputs_filtered (expanded, gdb_stdout); | |
109 | fputs_filtered ("\n", gdb_stdout); | |
110 | } | |
111 | else | |
112 | fputs_filtered ("GDB has no preprocessor macro information for " | |
113 | "that code.\n", | |
114 | gdb_stdout); | |
115 | ||
116 | do_cleanups (cleanup_chain); | |
117 | return; | |
118 | } | |
119 | ||
120 | ||
121 | static void | |
122 | show_pp_source_pos (struct ui_file *stream, | |
123 | struct macro_source_file *file, | |
124 | int line) | |
125 | { | |
126 | fprintf_filtered (stream, "%s:%d\n", file->filename, line); | |
127 | ||
128 | while (file->included_by) | |
129 | { | |
130 | fprintf_filtered (gdb_stdout, " included at %s:%d\n", | |
131 | file->included_by->filename, | |
132 | file->included_at_line); | |
133 | file = file->included_by; | |
134 | } | |
135 | } | |
136 | ||
137 | ||
138 | static void | |
475b0867 | 139 | info_macro_command (char *name, int from_tty) |
6821892e JB |
140 | { |
141 | struct macro_scope *ms = NULL; | |
142 | struct cleanup *cleanup_chain = make_cleanup (free_current_contents, &ms); | |
143 | struct macro_definition *d; | |
144 | ||
145 | if (! name || ! *name) | |
8a3fe4f8 | 146 | error (_("You must follow the `info macro' command with the name" |
6821892e | 147 | " of the macro\n" |
8a3fe4f8 | 148 | "whose definition you want to see.")); |
6821892e JB |
149 | |
150 | ms = default_macro_scope (); | |
151 | if (! ms) | |
8a3fe4f8 | 152 | error (_("GDB has no preprocessor macro information for that code.")); |
6821892e JB |
153 | |
154 | d = macro_lookup_definition (ms->file, ms->line, name); | |
155 | if (d) | |
156 | { | |
157 | int line; | |
158 | struct macro_source_file *file | |
159 | = macro_definition_location (ms->file, ms->line, name, &line); | |
160 | ||
161 | fprintf_filtered (gdb_stdout, "Defined at "); | |
162 | show_pp_source_pos (gdb_stdout, file, line); | |
484086b7 JK |
163 | if (line != 0) |
164 | fprintf_filtered (gdb_stdout, "#define %s", name); | |
165 | else | |
166 | fprintf_filtered (gdb_stdout, "-D%s", name); | |
6821892e JB |
167 | if (d->kind == macro_function_like) |
168 | { | |
169 | int i; | |
170 | ||
171 | fputs_filtered ("(", gdb_stdout); | |
172 | for (i = 0; i < d->argc; i++) | |
173 | { | |
174 | fputs_filtered (d->argv[i], gdb_stdout); | |
175 | if (i + 1 < d->argc) | |
176 | fputs_filtered (", ", gdb_stdout); | |
177 | } | |
178 | fputs_filtered (")", gdb_stdout); | |
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); | |
6821892e JB |
184 | } |
185 | else | |
186 | { | |
187 | fprintf_filtered (gdb_stdout, | |
188 | "The symbol `%s' has no definition as a C/C++" | |
189 | " preprocessor macro\n" | |
190 | "at ", name); | |
191 | show_pp_source_pos (gdb_stdout, ms->file, ms->line); | |
192 | } | |
193 | ||
194 | do_cleanups (cleanup_chain); | |
195 | } | |
196 | ||
197 | ||
198 | \f | |
199 | /* User-defined macros. */ | |
200 | ||
d7d9f01e TT |
201 | static void |
202 | skip_ws (char **expp) | |
203 | { | |
204 | while (macro_is_whitespace (**expp)) | |
205 | ++*expp; | |
206 | } | |
207 | ||
2fae03e8 TT |
208 | /* Try to find the bounds of an identifier. If an identifier is |
209 | found, returns a newly allocated string; otherwise returns NULL. | |
210 | EXPP is a pointer to an input string; it is updated to point to the | |
211 | text following the identifier. If IS_PARAMETER is true, this | |
212 | function will also allow "..." forms as used in varargs macro | |
213 | parameters. */ | |
214 | ||
d7d9f01e | 215 | static char * |
2fae03e8 | 216 | extract_identifier (char **expp, int is_parameter) |
d7d9f01e TT |
217 | { |
218 | char *result; | |
219 | char *p = *expp; | |
220 | unsigned int len; | |
2fae03e8 TT |
221 | |
222 | if (is_parameter && !strncmp (p, "...", 3)) | |
223 | { | |
224 | /* Ok. */ | |
225 | } | |
226 | else | |
227 | { | |
228 | if (! *p || ! macro_is_identifier_nondigit (*p)) | |
229 | return NULL; | |
230 | for (++p; | |
231 | *p && (macro_is_identifier_nondigit (*p) || macro_is_digit (*p)); | |
232 | ++p) | |
233 | ; | |
234 | } | |
235 | ||
236 | if (is_parameter && !strncmp (p, "...", 3)) | |
237 | p += 3; | |
238 | ||
d7d9f01e TT |
239 | len = p - *expp; |
240 | result = (char *) xmalloc (len + 1); | |
241 | memcpy (result, *expp, len); | |
242 | result[len] = '\0'; | |
243 | *expp += len; | |
244 | return result; | |
245 | } | |
246 | ||
247 | /* Helper function to clean up a temporarily-constructed macro object. | |
248 | This assumes that the contents were all allocated with xmalloc. */ | |
249 | static void | |
250 | free_macro_definition_ptr (void *ptr) | |
251 | { | |
252 | int i; | |
253 | struct macro_definition *loc = (struct macro_definition *) ptr; | |
b8d56208 | 254 | |
d7d9f01e TT |
255 | for (i = 0; i < loc->argc; ++i) |
256 | xfree ((char *) loc->argv[i]); | |
257 | xfree ((char *) loc->argv); | |
258 | /* Note that the 'replacement' field is not allocated. */ | |
259 | } | |
6821892e JB |
260 | |
261 | static void | |
262 | macro_define_command (char *exp, int from_tty) | |
263 | { | |
d7d9f01e TT |
264 | struct macro_definition new_macro; |
265 | char *name = NULL; | |
886a217c TT |
266 | struct cleanup *cleanup_chain; |
267 | ||
268 | if (!exp) | |
269 | error (_("usage: macro define NAME[(ARGUMENT-LIST)] [REPLACEMENT-LIST]")); | |
270 | ||
271 | cleanup_chain = make_cleanup (free_macro_definition_ptr, &new_macro); | |
d7d9f01e TT |
272 | make_cleanup (free_current_contents, &name); |
273 | ||
274 | memset (&new_macro, 0, sizeof (struct macro_definition)); | |
275 | ||
276 | skip_ws (&exp); | |
2fae03e8 | 277 | name = extract_identifier (&exp, 0); |
d7d9f01e TT |
278 | if (! name) |
279 | error (_("Invalid macro name.")); | |
280 | if (*exp == '(') | |
281 | { | |
282 | /* Function-like macro. */ | |
283 | int alloced = 5; | |
284 | char **argv = (char **) xmalloc (alloced * sizeof (char *)); | |
285 | ||
286 | new_macro.kind = macro_function_like; | |
287 | new_macro.argc = 0; | |
288 | new_macro.argv = (const char * const *) argv; | |
289 | ||
290 | /* Skip the '(' and whitespace. */ | |
291 | ++exp; | |
292 | skip_ws (&exp); | |
293 | ||
294 | while (*exp != ')') | |
295 | { | |
296 | int i; | |
297 | ||
298 | if (new_macro.argc == alloced) | |
299 | { | |
300 | alloced *= 2; | |
301 | argv = (char **) xrealloc (argv, alloced * sizeof (char *)); | |
025bb325 | 302 | /* Must update new_macro as well... */ |
d7d9f01e TT |
303 | new_macro.argv = (const char * const *) argv; |
304 | } | |
2fae03e8 | 305 | argv[new_macro.argc] = extract_identifier (&exp, 1); |
d7d9f01e TT |
306 | if (! argv[new_macro.argc]) |
307 | error (_("Macro is missing an argument.")); | |
308 | ++new_macro.argc; | |
309 | ||
310 | for (i = new_macro.argc - 2; i >= 0; --i) | |
311 | { | |
312 | if (! strcmp (argv[i], argv[new_macro.argc - 1])) | |
313 | error (_("Two macro arguments with identical names.")); | |
314 | } | |
315 | ||
316 | skip_ws (&exp); | |
317 | if (*exp == ',') | |
318 | { | |
319 | ++exp; | |
320 | skip_ws (&exp); | |
321 | } | |
322 | else if (*exp != ')') | |
323 | error (_("',' or ')' expected at end of macro arguments.")); | |
324 | } | |
325 | /* Skip the closing paren. */ | |
326 | ++exp; | |
cc704ebe | 327 | skip_ws (&exp); |
d7d9f01e TT |
328 | |
329 | macro_define_function (macro_main (macro_user_macros), -1, name, | |
330 | new_macro.argc, (const char **) new_macro.argv, | |
331 | exp); | |
332 | } | |
333 | else | |
cc704ebe TT |
334 | { |
335 | skip_ws (&exp); | |
336 | macro_define_object (macro_main (macro_user_macros), -1, name, exp); | |
337 | } | |
d7d9f01e TT |
338 | |
339 | do_cleanups (cleanup_chain); | |
6821892e JB |
340 | } |
341 | ||
342 | ||
343 | static void | |
344 | macro_undef_command (char *exp, int from_tty) | |
345 | { | |
d7d9f01e | 346 | char *name; |
886a217c TT |
347 | |
348 | if (!exp) | |
349 | error (_("usage: macro undef NAME")); | |
350 | ||
d7d9f01e | 351 | skip_ws (&exp); |
2fae03e8 | 352 | name = extract_identifier (&exp, 0); |
d7d9f01e TT |
353 | if (! name) |
354 | error (_("Invalid macro name.")); | |
355 | macro_undef (macro_main (macro_user_macros), -1, name); | |
356 | xfree (name); | |
357 | } | |
358 | ||
359 | ||
360 | static void | |
9a044a89 TT |
361 | print_one_macro (const char *name, const struct macro_definition *macro, |
362 | void *ignore) | |
d7d9f01e TT |
363 | { |
364 | fprintf_filtered (gdb_stdout, "macro define %s", name); | |
365 | if (macro->kind == macro_function_like) | |
366 | { | |
367 | int i; | |
b8d56208 | 368 | |
d7d9f01e TT |
369 | fprintf_filtered (gdb_stdout, "("); |
370 | for (i = 0; i < macro->argc; ++i) | |
371 | fprintf_filtered (gdb_stdout, "%s%s", (i > 0) ? ", " : "", | |
372 | macro->argv[i]); | |
373 | fprintf_filtered (gdb_stdout, ")"); | |
374 | } | |
cc704ebe | 375 | fprintf_filtered (gdb_stdout, " %s\n", macro->replacement); |
6821892e JB |
376 | } |
377 | ||
378 | ||
379 | static void | |
380 | macro_list_command (char *exp, int from_tty) | |
381 | { | |
9a044a89 | 382 | macro_for_each (macro_user_macros, print_one_macro, NULL); |
6821892e JB |
383 | } |
384 | ||
385 | ||
386 | \f | |
387 | /* Initializing the `macrocmd' module. */ | |
388 | ||
a78f21af | 389 | extern initialize_file_ftype _initialize_macrocmd; /* -Wmissing-prototypes */ |
b9362cc7 | 390 | |
6821892e JB |
391 | void |
392 | _initialize_macrocmd (void) | |
393 | { | |
6821892e JB |
394 | /* We introduce a new command prefix, `macro', under which we'll put |
395 | the various commands for working with preprocessor macros. */ | |
1bedd215 AC |
396 | add_prefix_cmd ("macro", class_info, macro_command, |
397 | _("Prefix for commands dealing with C preprocessor macros."), | |
398 | ¯olist, "macro ", 0, &cmdlist); | |
6821892e | 399 | |
1a966eab AC |
400 | add_cmd ("expand", no_class, macro_expand_command, _("\ |
401 | Fully expand any C/C++ preprocessor macro invocations in EXPRESSION.\n\ | |
402 | Show the expanded expression."), | |
403 | ¯olist); | |
6821892e | 404 | add_alias_cmd ("exp", "expand", no_class, 1, ¯olist); |
1a966eab AC |
405 | add_cmd ("expand-once", no_class, macro_expand_once_command, _("\ |
406 | Expand C/C++ preprocessor macro invocations appearing directly in EXPRESSION.\n\ | |
407 | Show the expanded expression.\n\ | |
408 | \n\ | |
409 | This command differs from `macro expand' in that it only expands macro\n\ | |
410 | invocations that appear directly in EXPRESSION; if expanding a macro\n\ | |
411 | introduces further macro invocations, those are left unexpanded.\n\ | |
412 | \n\ | |
413 | `macro expand-once' helps you see how a particular macro expands,\n\ | |
414 | whereas `macro expand' shows you how all the macros involved in an\n\ | |
415 | expression work together to yield a pre-processed expression."), | |
416 | ¯olist); | |
6821892e JB |
417 | add_alias_cmd ("exp1", "expand-once", no_class, 1, ¯olist); |
418 | ||
1a966eab AC |
419 | add_cmd ("macro", no_class, info_macro_command, |
420 | _("Show the definition of MACRO, and its source location."), | |
421 | &infolist); | |
422 | ||
423 | add_cmd ("define", no_class, macro_define_command, _("\ | |
424 | Define a new C/C++ preprocessor macro.\n\ | |
425 | The GDB command `macro define DEFINITION' is equivalent to placing a\n\ | |
426 | preprocessor directive of the form `#define DEFINITION' such that the\n\ | |
427 | definition is visible in all the inferior's source files.\n\ | |
428 | For example:\n\ | |
429 | (gdb) macro define PI (3.1415926)\n\ | |
430 | (gdb) macro define MIN(x,y) ((x) < (y) ? (x) : (y))"), | |
431 | ¯olist); | |
432 | ||
433 | add_cmd ("undef", no_class, macro_undef_command, _("\ | |
434 | Remove the definition of the C/C++ preprocessor macro with the given name."), | |
435 | ¯olist); | |
436 | ||
437 | add_cmd ("list", no_class, macro_list_command, | |
438 | _("List all the macros defined using the `macro define' command."), | |
439 | ¯olist); | |
6821892e | 440 | } |