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Commit | Line | Data |
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6de9cd9a | 1 | /* Maintain binary trees of symbols. |
710a179f TS |
2 | Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
3 | Free Software Foundation, Inc. | |
6de9cd9a DN |
4 | Contributed by Andy Vaught |
5 | ||
9fc4d79b | 6 | This file is part of GCC. |
6de9cd9a | 7 | |
9fc4d79b TS |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
6de9cd9a | 12 | |
9fc4d79b TS |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
6de9cd9a DN |
17 | |
18 | You should have received a copy of the GNU General Public License | |
9fc4d79b | 19 | along with GCC; see the file COPYING. If not, write to the Free |
ab57747b KC |
20 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
6de9cd9a DN |
22 | |
23 | ||
24 | #include "config.h" | |
d22e4895 | 25 | #include "system.h" |
6690a9e0 | 26 | #include "flags.h" |
6de9cd9a DN |
27 | #include "gfortran.h" |
28 | #include "parse.h" | |
29 | ||
a8b3b0b6 | 30 | |
6de9cd9a DN |
31 | /* Strings for all symbol attributes. We use these for dumping the |
32 | parse tree, in error messages, and also when reading and writing | |
33 | modules. */ | |
34 | ||
35 | const mstring flavors[] = | |
36 | { | |
37 | minit ("UNKNOWN-FL", FL_UNKNOWN), minit ("PROGRAM", FL_PROGRAM), | |
38 | minit ("BLOCK-DATA", FL_BLOCK_DATA), minit ("MODULE", FL_MODULE), | |
39 | minit ("VARIABLE", FL_VARIABLE), minit ("PARAMETER", FL_PARAMETER), | |
40 | minit ("LABEL", FL_LABEL), minit ("PROCEDURE", FL_PROCEDURE), | |
41 | minit ("DERIVED", FL_DERIVED), minit ("NAMELIST", FL_NAMELIST), | |
42 | minit (NULL, -1) | |
43 | }; | |
44 | ||
45 | const mstring procedures[] = | |
46 | { | |
47 | minit ("UNKNOWN-PROC", PROC_UNKNOWN), | |
48 | minit ("MODULE-PROC", PROC_MODULE), | |
49 | minit ("INTERNAL-PROC", PROC_INTERNAL), | |
50 | minit ("DUMMY-PROC", PROC_DUMMY), | |
51 | minit ("INTRINSIC-PROC", PROC_INTRINSIC), | |
52 | minit ("EXTERNAL-PROC", PROC_EXTERNAL), | |
53 | minit ("STATEMENT-PROC", PROC_ST_FUNCTION), | |
54 | minit (NULL, -1) | |
55 | }; | |
56 | ||
57 | const mstring intents[] = | |
58 | { | |
59 | minit ("UNKNOWN-INTENT", INTENT_UNKNOWN), | |
60 | minit ("IN", INTENT_IN), | |
61 | minit ("OUT", INTENT_OUT), | |
62 | minit ("INOUT", INTENT_INOUT), | |
63 | minit (NULL, -1) | |
64 | }; | |
65 | ||
66 | const mstring access_types[] = | |
67 | { | |
68 | minit ("UNKNOWN-ACCESS", ACCESS_UNKNOWN), | |
69 | minit ("PUBLIC", ACCESS_PUBLIC), | |
70 | minit ("PRIVATE", ACCESS_PRIVATE), | |
71 | minit (NULL, -1) | |
72 | }; | |
73 | ||
74 | const mstring ifsrc_types[] = | |
75 | { | |
76 | minit ("UNKNOWN", IFSRC_UNKNOWN), | |
77 | minit ("DECL", IFSRC_DECL), | |
78 | minit ("BODY", IFSRC_IFBODY), | |
79 | minit ("USAGE", IFSRC_USAGE) | |
80 | }; | |
81 | ||
82 | ||
83 | /* This is to make sure the backend generates setup code in the correct | |
84 | order. */ | |
85 | ||
86 | static int next_dummy_order = 1; | |
87 | ||
88 | ||
89 | gfc_namespace *gfc_current_ns; | |
90 | ||
c9543002 TS |
91 | gfc_gsymbol *gfc_gsym_root = NULL; |
92 | ||
6de9cd9a DN |
93 | static gfc_symbol *changed_syms = NULL; |
94 | ||
7453378e PT |
95 | gfc_dt_list *gfc_derived_types; |
96 | ||
6de9cd9a DN |
97 | |
98 | /*********** IMPLICIT NONE and IMPLICIT statement handlers ***********/ | |
99 | ||
1107b970 PB |
100 | /* The following static variable indicates whether a particular element has |
101 | been explicitly set or not. */ | |
6de9cd9a | 102 | |
6de9cd9a DN |
103 | static int new_flag[GFC_LETTERS]; |
104 | ||
105 | ||
106 | /* Handle a correctly parsed IMPLICIT NONE. */ | |
107 | ||
108 | void | |
109 | gfc_set_implicit_none (void) | |
110 | { | |
111 | int i; | |
112 | ||
438e1428 TS |
113 | if (gfc_current_ns->seen_implicit_none) |
114 | { | |
115 | gfc_error ("Duplicate IMPLICIT NONE statement at %C"); | |
116 | return; | |
117 | } | |
118 | ||
119 | gfc_current_ns->seen_implicit_none = 1; | |
120 | ||
1107b970 | 121 | for (i = 0; i < GFC_LETTERS; i++) |
6de9cd9a | 122 | { |
1107b970 PB |
123 | gfc_clear_ts (&gfc_current_ns->default_type[i]); |
124 | gfc_current_ns->set_flag[i] = 1; | |
6de9cd9a DN |
125 | } |
126 | } | |
127 | ||
128 | ||
1107b970 | 129 | /* Reset the implicit range flags. */ |
6de9cd9a DN |
130 | |
131 | void | |
1107b970 | 132 | gfc_clear_new_implicit (void) |
6de9cd9a DN |
133 | { |
134 | int i; | |
135 | ||
136 | for (i = 0; i < GFC_LETTERS; i++) | |
1107b970 | 137 | new_flag[i] = 0; |
6de9cd9a DN |
138 | } |
139 | ||
140 | ||
1107b970 | 141 | /* Prepare for a new implicit range. Sets flags in new_flag[]. */ |
6de9cd9a | 142 | |
1107b970 PB |
143 | try |
144 | gfc_add_new_implicit_range (int c1, int c2) | |
6de9cd9a DN |
145 | { |
146 | int i; | |
147 | ||
148 | c1 -= 'a'; | |
149 | c2 -= 'a'; | |
150 | ||
151 | for (i = c1; i <= c2; i++) | |
152 | { | |
153 | if (new_flag[i]) | |
154 | { | |
155 | gfc_error ("Letter '%c' already set in IMPLICIT statement at %C", | |
156 | i + 'A'); | |
157 | return FAILURE; | |
158 | } | |
159 | ||
6de9cd9a DN |
160 | new_flag[i] = 1; |
161 | } | |
162 | ||
163 | return SUCCESS; | |
164 | } | |
165 | ||
166 | ||
1107b970 PB |
167 | /* Add a matched implicit range for gfc_set_implicit(). Check if merging |
168 | the new implicit types back into the existing types will work. */ | |
6de9cd9a DN |
169 | |
170 | try | |
66e4ab31 | 171 | gfc_merge_new_implicit (gfc_typespec *ts) |
6de9cd9a DN |
172 | { |
173 | int i; | |
174 | ||
438e1428 TS |
175 | if (gfc_current_ns->seen_implicit_none) |
176 | { | |
177 | gfc_error ("Cannot specify IMPLICIT at %C after IMPLICIT NONE"); | |
178 | return FAILURE; | |
179 | } | |
180 | ||
6de9cd9a | 181 | for (i = 0; i < GFC_LETTERS; i++) |
1107b970 PB |
182 | { |
183 | if (new_flag[i]) | |
184 | { | |
6de9cd9a | 185 | |
1107b970 PB |
186 | if (gfc_current_ns->set_flag[i]) |
187 | { | |
188 | gfc_error ("Letter %c already has an IMPLICIT type at %C", | |
189 | i + 'A'); | |
190 | return FAILURE; | |
191 | } | |
192 | gfc_current_ns->default_type[i] = *ts; | |
193 | gfc_current_ns->set_flag[i] = 1; | |
194 | } | |
195 | } | |
6de9cd9a DN |
196 | return SUCCESS; |
197 | } | |
198 | ||
199 | ||
eebc3ee0 | 200 | /* Given a symbol, return a pointer to the typespec for its default type. */ |
6de9cd9a DN |
201 | |
202 | gfc_typespec * | |
66e4ab31 | 203 | gfc_get_default_type (gfc_symbol *sym, gfc_namespace *ns) |
6de9cd9a DN |
204 | { |
205 | char letter; | |
206 | ||
207 | letter = sym->name[0]; | |
e6472bce FXC |
208 | |
209 | if (gfc_option.flag_allow_leading_underscore && letter == '_') | |
210 | gfc_internal_error ("Option -fallow_leading_underscore is for use only by " | |
211 | "gfortran developers, and should not be used for " | |
212 | "implicitly typed variables"); | |
213 | ||
6de9cd9a DN |
214 | if (letter < 'a' || letter > 'z') |
215 | gfc_internal_error ("gfc_get_default_type(): Bad symbol"); | |
216 | ||
217 | if (ns == NULL) | |
218 | ns = gfc_current_ns; | |
219 | ||
220 | return &ns->default_type[letter - 'a']; | |
221 | } | |
222 | ||
223 | ||
224 | /* Given a pointer to a symbol, set its type according to the first | |
225 | letter of its name. Fails if the letter in question has no default | |
226 | type. */ | |
227 | ||
228 | try | |
66e4ab31 | 229 | gfc_set_default_type (gfc_symbol *sym, int error_flag, gfc_namespace *ns) |
6de9cd9a DN |
230 | { |
231 | gfc_typespec *ts; | |
232 | ||
233 | if (sym->ts.type != BT_UNKNOWN) | |
234 | gfc_internal_error ("gfc_set_default_type(): symbol already has a type"); | |
235 | ||
236 | ts = gfc_get_default_type (sym, ns); | |
237 | ||
238 | if (ts->type == BT_UNKNOWN) | |
239 | { | |
d1303acd TS |
240 | if (error_flag && !sym->attr.untyped) |
241 | { | |
242 | gfc_error ("Symbol '%s' at %L has no IMPLICIT type", | |
243 | sym->name, &sym->declared_at); | |
244 | sym->attr.untyped = 1; /* Ensure we only give an error once. */ | |
245 | } | |
6de9cd9a DN |
246 | |
247 | return FAILURE; | |
248 | } | |
249 | ||
250 | sym->ts = *ts; | |
251 | sym->attr.implicit_type = 1; | |
252 | ||
a8b3b0b6 CR |
253 | if (sym->attr.is_bind_c == 1) |
254 | { | |
255 | /* BIND(C) variables should not be implicitly declared. */ | |
256 | gfc_warning_now ("Implicitly declared BIND(C) variable '%s' at %L may " | |
257 | "not be C interoperable", sym->name, &sym->declared_at); | |
258 | sym->ts.f90_type = sym->ts.type; | |
259 | } | |
260 | ||
261 | if (sym->attr.dummy != 0) | |
262 | { | |
263 | if (sym->ns->proc_name != NULL | |
264 | && (sym->ns->proc_name->attr.subroutine != 0 | |
265 | || sym->ns->proc_name->attr.function != 0) | |
266 | && sym->ns->proc_name->attr.is_bind_c != 0) | |
267 | { | |
268 | /* Dummy args to a BIND(C) routine may not be interoperable if | |
269 | they are implicitly typed. */ | |
270 | gfc_warning_now ("Implicity declared variable '%s' at %L may not " | |
271 | "be C interoperable but it is a dummy argument to " | |
272 | "the BIND(C) procedure '%s' at %L", sym->name, | |
273 | &(sym->declared_at), sym->ns->proc_name->name, | |
274 | &(sym->ns->proc_name->declared_at)); | |
275 | sym->ts.f90_type = sym->ts.type; | |
276 | } | |
277 | } | |
278 | ||
6de9cd9a DN |
279 | return SUCCESS; |
280 | } | |
281 | ||
282 | ||
e9bd9f7d PT |
283 | /* This function is called from parse.c(parse_progunit) to check the |
284 | type of the function is not implicitly typed in the host namespace | |
285 | and to implicitly type the function result, if necessary. */ | |
286 | ||
287 | void | |
288 | gfc_check_function_type (gfc_namespace *ns) | |
289 | { | |
290 | gfc_symbol *proc = ns->proc_name; | |
291 | ||
292 | if (!proc->attr.contained || proc->result->attr.implicit_type) | |
293 | return; | |
294 | ||
295 | if (proc->result->ts.type == BT_UNKNOWN) | |
296 | { | |
297 | if (gfc_set_default_type (proc->result, 0, gfc_current_ns) | |
298 | == SUCCESS) | |
299 | { | |
300 | if (proc->result != proc) | |
c2de0c19 TB |
301 | { |
302 | proc->ts = proc->result->ts; | |
303 | proc->as = gfc_copy_array_spec (proc->result->as); | |
304 | proc->attr.dimension = proc->result->attr.dimension; | |
305 | proc->attr.pointer = proc->result->attr.pointer; | |
306 | proc->attr.allocatable = proc->result->attr.allocatable; | |
307 | } | |
e9bd9f7d PT |
308 | } |
309 | else | |
310 | { | |
c2de0c19 TB |
311 | gfc_error ("Function result '%s' at %L has no IMPLICIT type", |
312 | proc->result->name, &proc->result->declared_at); | |
e9bd9f7d PT |
313 | proc->result->attr.untyped = 1; |
314 | } | |
315 | } | |
316 | } | |
317 | ||
318 | ||
6de9cd9a DN |
319 | /******************** Symbol attribute stuff *********************/ |
320 | ||
321 | /* This is a generic conflict-checker. We do this to avoid having a | |
322 | single conflict in two places. */ | |
323 | ||
324 | #define conf(a, b) if (attr->a && attr->b) { a1 = a; a2 = b; goto conflict; } | |
325 | #define conf2(a) if (attr->a) { a2 = a; goto conflict; } | |
aa08038d EE |
326 | #define conf_std(a, b, std) if (attr->a && attr->b)\ |
327 | {\ | |
328 | a1 = a;\ | |
329 | a2 = b;\ | |
330 | standard = std;\ | |
331 | goto conflict_std;\ | |
332 | } | |
6de9cd9a DN |
333 | |
334 | static try | |
66e4ab31 | 335 | check_conflict (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
336 | { |
337 | static const char *dummy = "DUMMY", *save = "SAVE", *pointer = "POINTER", | |
338 | *target = "TARGET", *external = "EXTERNAL", *intent = "INTENT", | |
775e6c3a | 339 | *intent_in = "INTENT(IN)", *intrinsic = "INTRINSIC", |
06469efd | 340 | *intent_out = "INTENT(OUT)", *intent_inout = "INTENT(INOUT)", |
775e6c3a TB |
341 | *allocatable = "ALLOCATABLE", *elemental = "ELEMENTAL", |
342 | *private = "PRIVATE", *recursive = "RECURSIVE", | |
6de9cd9a DN |
343 | *in_common = "COMMON", *result = "RESULT", *in_namelist = "NAMELIST", |
344 | *public = "PUBLIC", *optional = "OPTIONAL", *entry = "ENTRY", | |
345 | *function = "FUNCTION", *subroutine = "SUBROUTINE", | |
e8ec07e1 | 346 | *dimension = "DIMENSION", *in_equivalence = "EQUIVALENCE", |
83d890b9 | 347 | *use_assoc = "USE ASSOCIATED", *cray_pointer = "CRAY POINTER", |
06469efd | 348 | *cray_pointee = "CRAY POINTEE", *data = "DATA", *value = "VALUE", |
a8b3b0b6 CR |
349 | *volatile_ = "VOLATILE", *protected = "PROTECTED", |
350 | *is_bind_c = "BIND(C)"; | |
6c7a4dfd | 351 | static const char *threadprivate = "THREADPRIVATE"; |
6de9cd9a DN |
352 | |
353 | const char *a1, *a2; | |
aa08038d | 354 | int standard; |
6de9cd9a DN |
355 | |
356 | if (where == NULL) | |
63645982 | 357 | where = &gfc_current_locus; |
6de9cd9a DN |
358 | |
359 | if (attr->pointer && attr->intent != INTENT_UNKNOWN) | |
360 | { | |
361 | a1 = pointer; | |
362 | a2 = intent; | |
f17facac TB |
363 | standard = GFC_STD_F2003; |
364 | goto conflict_std; | |
6de9cd9a DN |
365 | } |
366 | ||
367 | /* Check for attributes not allowed in a BLOCK DATA. */ | |
368 | if (gfc_current_state () == COMP_BLOCK_DATA) | |
369 | { | |
370 | a1 = NULL; | |
371 | ||
53096259 PT |
372 | if (attr->in_namelist) |
373 | a1 = in_namelist; | |
6de9cd9a DN |
374 | if (attr->allocatable) |
375 | a1 = allocatable; | |
376 | if (attr->external) | |
377 | a1 = external; | |
378 | if (attr->optional) | |
379 | a1 = optional; | |
380 | if (attr->access == ACCESS_PRIVATE) | |
381 | a1 = private; | |
382 | if (attr->access == ACCESS_PUBLIC) | |
383 | a1 = public; | |
384 | if (attr->intent != INTENT_UNKNOWN) | |
385 | a1 = intent; | |
386 | ||
387 | if (a1 != NULL) | |
388 | { | |
389 | gfc_error | |
66e4ab31 SK |
390 | ("%s attribute not allowed in BLOCK DATA program unit at %L", |
391 | a1, where); | |
6de9cd9a DN |
392 | return FAILURE; |
393 | } | |
394 | } | |
395 | ||
9c213349 TB |
396 | conf (dummy, entry); |
397 | conf (dummy, intrinsic); | |
6de9cd9a | 398 | conf (dummy, save); |
6c7a4dfd | 399 | conf (dummy, threadprivate); |
6de9cd9a | 400 | conf (pointer, target); |
6de9cd9a | 401 | conf (pointer, intrinsic); |
1902704e | 402 | conf (pointer, elemental); |
8e119f1b | 403 | conf (allocatable, elemental); |
1902704e | 404 | |
6de9cd9a DN |
405 | conf (target, external); |
406 | conf (target, intrinsic); | |
407 | conf (external, dimension); /* See Fortran 95's R504. */ | |
408 | ||
409 | conf (external, intrinsic); | |
1902704e PT |
410 | |
411 | if (attr->if_source || attr->contained) | |
412 | { | |
413 | conf (external, subroutine); | |
414 | conf (external, function); | |
415 | } | |
416 | ||
6de9cd9a | 417 | conf (allocatable, pointer); |
aa08038d | 418 | conf_std (allocatable, dummy, GFC_STD_F2003); |
8e119f1b EE |
419 | conf_std (allocatable, function, GFC_STD_F2003); |
420 | conf_std (allocatable, result, GFC_STD_F2003); | |
6de9cd9a DN |
421 | conf (elemental, recursive); |
422 | ||
423 | conf (in_common, dummy); | |
424 | conf (in_common, allocatable); | |
425 | conf (in_common, result); | |
96b95725 PT |
426 | conf (in_common, save); |
427 | conf (result, save); | |
428 | ||
6de9cd9a DN |
429 | conf (dummy, result); |
430 | ||
e8ec07e1 PT |
431 | conf (in_equivalence, use_assoc); |
432 | conf (in_equivalence, dummy); | |
433 | conf (in_equivalence, target); | |
434 | conf (in_equivalence, pointer); | |
435 | conf (in_equivalence, function); | |
436 | conf (in_equivalence, result); | |
437 | conf (in_equivalence, entry); | |
438 | conf (in_equivalence, allocatable); | |
6c7a4dfd | 439 | conf (in_equivalence, threadprivate); |
e8ec07e1 | 440 | |
6de9cd9a DN |
441 | conf (in_namelist, pointer); |
442 | conf (in_namelist, allocatable); | |
443 | ||
444 | conf (entry, result); | |
445 | ||
446 | conf (function, subroutine); | |
447 | ||
a8b3b0b6 CR |
448 | if (!function && !subroutine) |
449 | conf (is_bind_c, dummy); | |
450 | ||
451 | conf (is_bind_c, cray_pointer); | |
452 | conf (is_bind_c, cray_pointee); | |
453 | conf (is_bind_c, allocatable); | |
454 | ||
455 | /* Need to also get volatile attr, according to 5.1 of F2003 draft. | |
456 | Parameter conflict caught below. Also, value cannot be specified | |
457 | for a dummy procedure. */ | |
458 | ||
83d890b9 AL |
459 | /* Cray pointer/pointee conflicts. */ |
460 | conf (cray_pointer, cray_pointee); | |
461 | conf (cray_pointer, dimension); | |
462 | conf (cray_pointer, pointer); | |
463 | conf (cray_pointer, target); | |
464 | conf (cray_pointer, allocatable); | |
465 | conf (cray_pointer, external); | |
466 | conf (cray_pointer, intrinsic); | |
467 | conf (cray_pointer, in_namelist); | |
468 | conf (cray_pointer, function); | |
469 | conf (cray_pointer, subroutine); | |
470 | conf (cray_pointer, entry); | |
471 | ||
472 | conf (cray_pointee, allocatable); | |
473 | conf (cray_pointee, intent); | |
474 | conf (cray_pointee, optional); | |
475 | conf (cray_pointee, dummy); | |
476 | conf (cray_pointee, target); | |
83d890b9 AL |
477 | conf (cray_pointee, intrinsic); |
478 | conf (cray_pointee, pointer); | |
83d890b9 | 479 | conf (cray_pointee, entry); |
b122dc6a JJ |
480 | conf (cray_pointee, in_common); |
481 | conf (cray_pointee, in_equivalence); | |
6c7a4dfd | 482 | conf (cray_pointee, threadprivate); |
83d890b9 | 483 | |
4075a94e PT |
484 | conf (data, dummy); |
485 | conf (data, function); | |
486 | conf (data, result); | |
487 | conf (data, allocatable); | |
488 | conf (data, use_assoc); | |
489 | ||
06469efd PT |
490 | conf (value, pointer) |
491 | conf (value, allocatable) | |
492 | conf (value, subroutine) | |
493 | conf (value, function) | |
494 | conf (value, volatile_) | |
495 | conf (value, dimension) | |
496 | conf (value, external) | |
497 | ||
66e4ab31 SK |
498 | if (attr->value |
499 | && (attr->intent == INTENT_OUT || attr->intent == INTENT_INOUT)) | |
06469efd PT |
500 | { |
501 | a1 = value; | |
502 | a2 = attr->intent == INTENT_OUT ? intent_out : intent_inout; | |
503 | goto conflict; | |
504 | } | |
505 | ||
a8b3b0b6 CR |
506 | conf (protected, intrinsic) |
507 | conf (protected, external) | |
508 | conf (protected, in_common) | |
509 | ||
775e6c3a TB |
510 | conf (volatile_, intrinsic) |
511 | conf (volatile_, external) | |
512 | ||
513 | if (attr->volatile_ && attr->intent == INTENT_IN) | |
514 | { | |
515 | a1 = volatile_; | |
516 | a2 = intent_in; | |
517 | goto conflict; | |
518 | } | |
519 | ||
6de9cd9a DN |
520 | a1 = gfc_code2string (flavors, attr->flavor); |
521 | ||
522 | if (attr->in_namelist | |
523 | && attr->flavor != FL_VARIABLE | |
847b053d | 524 | && attr->flavor != FL_PROCEDURE |
6de9cd9a DN |
525 | && attr->flavor != FL_UNKNOWN) |
526 | { | |
6de9cd9a DN |
527 | a2 = in_namelist; |
528 | goto conflict; | |
529 | } | |
530 | ||
531 | switch (attr->flavor) | |
532 | { | |
533 | case FL_PROGRAM: | |
534 | case FL_BLOCK_DATA: | |
535 | case FL_MODULE: | |
536 | case FL_LABEL: | |
9c213349 | 537 | conf2 (dimension); |
6de9cd9a DN |
538 | conf2 (dummy); |
539 | conf2 (save); | |
d7043acd | 540 | conf2 (volatile_); |
6de9cd9a | 541 | conf2 (pointer); |
ee7e677f | 542 | conf2 (protected); |
6de9cd9a DN |
543 | conf2 (target); |
544 | conf2 (external); | |
545 | conf2 (intrinsic); | |
546 | conf2 (allocatable); | |
547 | conf2 (result); | |
548 | conf2 (in_namelist); | |
549 | conf2 (optional); | |
550 | conf2 (function); | |
551 | conf2 (subroutine); | |
6c7a4dfd | 552 | conf2 (threadprivate); |
6de9cd9a DN |
553 | break; |
554 | ||
555 | case FL_VARIABLE: | |
556 | case FL_NAMELIST: | |
557 | break; | |
558 | ||
559 | case FL_PROCEDURE: | |
560 | conf2 (intent); | |
66e4ab31 | 561 | conf2 (save); |
6de9cd9a DN |
562 | |
563 | if (attr->subroutine) | |
564 | { | |
66e4ab31 SK |
565 | conf2 (pointer); |
566 | conf2 (target); | |
567 | conf2 (allocatable); | |
568 | conf2 (result); | |
569 | conf2 (in_namelist); | |
570 | conf2 (dimension); | |
571 | conf2 (function); | |
572 | conf2 (threadprivate); | |
6de9cd9a DN |
573 | } |
574 | ||
575 | switch (attr->proc) | |
576 | { | |
577 | case PROC_ST_FUNCTION: | |
578 | conf2 (in_common); | |
2bb02bf0 | 579 | conf2 (dummy); |
6de9cd9a DN |
580 | break; |
581 | ||
582 | case PROC_MODULE: | |
583 | conf2 (dummy); | |
584 | break; | |
585 | ||
586 | case PROC_DUMMY: | |
587 | conf2 (result); | |
588 | conf2 (in_common); | |
589 | conf2 (save); | |
6c7a4dfd | 590 | conf2 (threadprivate); |
6de9cd9a DN |
591 | break; |
592 | ||
593 | default: | |
594 | break; | |
595 | } | |
596 | ||
597 | break; | |
598 | ||
599 | case FL_DERIVED: | |
600 | conf2 (dummy); | |
601 | conf2 (save); | |
602 | conf2 (pointer); | |
603 | conf2 (target); | |
604 | conf2 (external); | |
605 | conf2 (intrinsic); | |
606 | conf2 (allocatable); | |
607 | conf2 (optional); | |
608 | conf2 (entry); | |
609 | conf2 (function); | |
610 | conf2 (subroutine); | |
6c7a4dfd | 611 | conf2 (threadprivate); |
6de9cd9a DN |
612 | |
613 | if (attr->intent != INTENT_UNKNOWN) | |
614 | { | |
615 | a2 = intent; | |
616 | goto conflict; | |
617 | } | |
618 | break; | |
619 | ||
620 | case FL_PARAMETER: | |
621 | conf2 (external); | |
622 | conf2 (intrinsic); | |
623 | conf2 (optional); | |
624 | conf2 (allocatable); | |
625 | conf2 (function); | |
626 | conf2 (subroutine); | |
627 | conf2 (entry); | |
628 | conf2 (pointer); | |
ee7e677f | 629 | conf2 (protected); |
6de9cd9a DN |
630 | conf2 (target); |
631 | conf2 (dummy); | |
632 | conf2 (in_common); | |
2a0abeaf | 633 | conf2 (save); |
06469efd | 634 | conf2 (value); |
775e6c3a | 635 | conf2 (volatile_); |
6c7a4dfd | 636 | conf2 (threadprivate); |
a8b3b0b6 CR |
637 | /* TODO: hmm, double check this. */ |
638 | conf2 (value); | |
6de9cd9a DN |
639 | break; |
640 | ||
641 | default: | |
642 | break; | |
643 | } | |
644 | ||
645 | return SUCCESS; | |
646 | ||
647 | conflict: | |
231b2fcc TS |
648 | if (name == NULL) |
649 | gfc_error ("%s attribute conflicts with %s attribute at %L", | |
650 | a1, a2, where); | |
651 | else | |
652 | gfc_error ("%s attribute conflicts with %s attribute in '%s' at %L", | |
653 | a1, a2, name, where); | |
654 | ||
6de9cd9a | 655 | return FAILURE; |
aa08038d EE |
656 | |
657 | conflict_std: | |
658 | if (name == NULL) | |
659 | { | |
f17facac | 660 | return gfc_notify_std (standard, "Fortran 2003: %s attribute " |
ee167bcb | 661 | "with %s attribute at %L", a1, a2, |
aa08038d EE |
662 | where); |
663 | } | |
664 | else | |
665 | { | |
f17facac TB |
666 | return gfc_notify_std (standard, "Fortran 2003: %s attribute " |
667 | "with %s attribute in '%s' at %L", | |
aa08038d EE |
668 | a1, a2, name, where); |
669 | } | |
6de9cd9a DN |
670 | } |
671 | ||
672 | #undef conf | |
673 | #undef conf2 | |
aa08038d | 674 | #undef conf_std |
6de9cd9a DN |
675 | |
676 | ||
677 | /* Mark a symbol as referenced. */ | |
678 | ||
679 | void | |
66e4ab31 | 680 | gfc_set_sym_referenced (gfc_symbol *sym) |
6de9cd9a | 681 | { |
66e4ab31 | 682 | |
6de9cd9a DN |
683 | if (sym->attr.referenced) |
684 | return; | |
685 | ||
686 | sym->attr.referenced = 1; | |
687 | ||
688 | /* Remember which order dummy variables are accessed in. */ | |
689 | if (sym->attr.dummy) | |
690 | sym->dummy_order = next_dummy_order++; | |
691 | } | |
692 | ||
693 | ||
694 | /* Common subroutine called by attribute changing subroutines in order | |
695 | to prevent them from changing a symbol that has been | |
696 | use-associated. Returns zero if it is OK to change the symbol, | |
697 | nonzero if not. */ | |
698 | ||
699 | static int | |
66e4ab31 | 700 | check_used (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
701 | { |
702 | ||
703 | if (attr->use_assoc == 0) | |
704 | return 0; | |
705 | ||
706 | if (where == NULL) | |
63645982 | 707 | where = &gfc_current_locus; |
6de9cd9a | 708 | |
231b2fcc TS |
709 | if (name == NULL) |
710 | gfc_error ("Cannot change attributes of USE-associated symbol at %L", | |
711 | where); | |
712 | else | |
713 | gfc_error ("Cannot change attributes of USE-associated symbol %s at %L", | |
714 | name, where); | |
6de9cd9a DN |
715 | |
716 | return 1; | |
717 | } | |
718 | ||
719 | ||
6de9cd9a DN |
720 | /* Generate an error because of a duplicate attribute. */ |
721 | ||
722 | static void | |
66e4ab31 | 723 | duplicate_attr (const char *attr, locus *where) |
6de9cd9a DN |
724 | { |
725 | ||
726 | if (where == NULL) | |
63645982 | 727 | where = &gfc_current_locus; |
6de9cd9a DN |
728 | |
729 | gfc_error ("Duplicate %s attribute specified at %L", attr, where); | |
730 | } | |
731 | ||
66e4ab31 SK |
732 | |
733 | /* Called from decl.c (attr_decl1) to check attributes, when declared | |
734 | separately. */ | |
6de9cd9a | 735 | |
1902704e | 736 | try |
66e4ab31 | 737 | gfc_add_attribute (symbol_attribute *attr, locus *where) |
1902704e | 738 | { |
66e4ab31 | 739 | |
7114edca | 740 | if (check_used (attr, NULL, where)) |
1902704e PT |
741 | return FAILURE; |
742 | ||
743 | return check_conflict (attr, NULL, where); | |
744 | } | |
745 | ||
6de9cd9a | 746 | try |
66e4ab31 | 747 | gfc_add_allocatable (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
748 | { |
749 | ||
7114edca | 750 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
751 | return FAILURE; |
752 | ||
753 | if (attr->allocatable) | |
754 | { | |
755 | duplicate_attr ("ALLOCATABLE", where); | |
756 | return FAILURE; | |
757 | } | |
758 | ||
759 | attr->allocatable = 1; | |
231b2fcc | 760 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
761 | } |
762 | ||
763 | ||
764 | try | |
66e4ab31 | 765 | gfc_add_dimension (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
766 | { |
767 | ||
7114edca | 768 | if (check_used (attr, name, where)) |
6de9cd9a DN |
769 | return FAILURE; |
770 | ||
771 | if (attr->dimension) | |
772 | { | |
773 | duplicate_attr ("DIMENSION", where); | |
774 | return FAILURE; | |
775 | } | |
776 | ||
777 | attr->dimension = 1; | |
231b2fcc | 778 | return check_conflict (attr, name, where); |
6de9cd9a DN |
779 | } |
780 | ||
781 | ||
782 | try | |
66e4ab31 | 783 | gfc_add_external (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
784 | { |
785 | ||
7114edca | 786 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
787 | return FAILURE; |
788 | ||
789 | if (attr->external) | |
790 | { | |
791 | duplicate_attr ("EXTERNAL", where); | |
792 | return FAILURE; | |
793 | } | |
794 | ||
795 | attr->external = 1; | |
796 | ||
231b2fcc | 797 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
798 | } |
799 | ||
800 | ||
801 | try | |
66e4ab31 | 802 | gfc_add_intrinsic (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
803 | { |
804 | ||
7114edca | 805 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
806 | return FAILURE; |
807 | ||
808 | if (attr->intrinsic) | |
809 | { | |
810 | duplicate_attr ("INTRINSIC", where); | |
811 | return FAILURE; | |
812 | } | |
813 | ||
814 | attr->intrinsic = 1; | |
815 | ||
231b2fcc | 816 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
817 | } |
818 | ||
819 | ||
820 | try | |
66e4ab31 | 821 | gfc_add_optional (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
822 | { |
823 | ||
7114edca | 824 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
825 | return FAILURE; |
826 | ||
827 | if (attr->optional) | |
828 | { | |
829 | duplicate_attr ("OPTIONAL", where); | |
830 | return FAILURE; | |
831 | } | |
832 | ||
833 | attr->optional = 1; | |
231b2fcc | 834 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
835 | } |
836 | ||
837 | ||
838 | try | |
66e4ab31 | 839 | gfc_add_pointer (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
840 | { |
841 | ||
7114edca | 842 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
843 | return FAILURE; |
844 | ||
845 | attr->pointer = 1; | |
231b2fcc | 846 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
847 | } |
848 | ||
849 | ||
83d890b9 | 850 | try |
66e4ab31 | 851 | gfc_add_cray_pointer (symbol_attribute *attr, locus *where) |
83d890b9 AL |
852 | { |
853 | ||
7114edca | 854 | if (check_used (attr, NULL, where)) |
83d890b9 AL |
855 | return FAILURE; |
856 | ||
857 | attr->cray_pointer = 1; | |
858 | return check_conflict (attr, NULL, where); | |
859 | } | |
860 | ||
861 | ||
862 | try | |
66e4ab31 | 863 | gfc_add_cray_pointee (symbol_attribute *attr, locus *where) |
83d890b9 AL |
864 | { |
865 | ||
7114edca | 866 | if (check_used (attr, NULL, where)) |
83d890b9 AL |
867 | return FAILURE; |
868 | ||
869 | if (attr->cray_pointee) | |
870 | { | |
871 | gfc_error ("Cray Pointee at %L appears in multiple pointer()" | |
e25a0da3 | 872 | " statements", where); |
83d890b9 AL |
873 | return FAILURE; |
874 | } | |
875 | ||
876 | attr->cray_pointee = 1; | |
877 | return check_conflict (attr, NULL, where); | |
878 | } | |
879 | ||
66e4ab31 | 880 | |
ee7e677f | 881 | try |
66e4ab31 | 882 | gfc_add_protected (symbol_attribute *attr, const char *name, locus *where) |
ee7e677f TB |
883 | { |
884 | if (check_used (attr, name, where)) | |
885 | return FAILURE; | |
886 | ||
887 | if (attr->protected) | |
888 | { | |
889 | if (gfc_notify_std (GFC_STD_LEGACY, | |
890 | "Duplicate PROTECTED attribute specified at %L", | |
891 | where) | |
892 | == FAILURE) | |
893 | return FAILURE; | |
894 | } | |
895 | ||
896 | attr->protected = 1; | |
897 | return check_conflict (attr, name, where); | |
898 | } | |
83d890b9 | 899 | |
66e4ab31 | 900 | |
6de9cd9a | 901 | try |
66e4ab31 | 902 | gfc_add_result (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
903 | { |
904 | ||
7114edca | 905 | if (check_used (attr, name, where)) |
6de9cd9a DN |
906 | return FAILURE; |
907 | ||
908 | attr->result = 1; | |
231b2fcc | 909 | return check_conflict (attr, name, where); |
6de9cd9a DN |
910 | } |
911 | ||
912 | ||
913 | try | |
66e4ab31 | 914 | gfc_add_save (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
915 | { |
916 | ||
231b2fcc | 917 | if (check_used (attr, name, where)) |
6de9cd9a DN |
918 | return FAILURE; |
919 | ||
920 | if (gfc_pure (NULL)) | |
921 | { | |
922 | gfc_error | |
923 | ("SAVE attribute at %L cannot be specified in a PURE procedure", | |
924 | where); | |
925 | return FAILURE; | |
926 | } | |
927 | ||
928 | if (attr->save) | |
929 | { | |
09e87839 AL |
930 | if (gfc_notify_std (GFC_STD_LEGACY, |
931 | "Duplicate SAVE attribute specified at %L", | |
932 | where) | |
933 | == FAILURE) | |
934 | return FAILURE; | |
6de9cd9a DN |
935 | } |
936 | ||
937 | attr->save = 1; | |
231b2fcc | 938 | return check_conflict (attr, name, where); |
6de9cd9a DN |
939 | } |
940 | ||
66e4ab31 | 941 | |
06469efd | 942 | try |
66e4ab31 | 943 | gfc_add_value (symbol_attribute *attr, const char *name, locus *where) |
06469efd PT |
944 | { |
945 | ||
946 | if (check_used (attr, name, where)) | |
947 | return FAILURE; | |
948 | ||
949 | if (attr->value) | |
950 | { | |
951 | if (gfc_notify_std (GFC_STD_LEGACY, | |
952 | "Duplicate VALUE attribute specified at %L", | |
953 | where) | |
954 | == FAILURE) | |
955 | return FAILURE; | |
956 | } | |
957 | ||
958 | attr->value = 1; | |
959 | return check_conflict (attr, name, where); | |
960 | } | |
961 | ||
66e4ab31 | 962 | |
775e6c3a | 963 | try |
66e4ab31 | 964 | gfc_add_volatile (symbol_attribute *attr, const char *name, locus *where) |
775e6c3a | 965 | { |
9bce3c1c TB |
966 | /* No check_used needed as 11.2.1 of the F2003 standard allows |
967 | that the local identifier made accessible by a use statement can be | |
968 | given a VOLATILE attribute. */ | |
969 | ||
77bb16aa TB |
970 | if (attr->volatile_ && attr->volatile_ns == gfc_current_ns) |
971 | if (gfc_notify_std (GFC_STD_LEGACY, | |
972 | "Duplicate VOLATILE attribute specified at %L", where) | |
973 | == FAILURE) | |
974 | return FAILURE; | |
775e6c3a TB |
975 | |
976 | attr->volatile_ = 1; | |
77bb16aa | 977 | attr->volatile_ns = gfc_current_ns; |
775e6c3a TB |
978 | return check_conflict (attr, name, where); |
979 | } | |
980 | ||
6de9cd9a | 981 | |
6c7a4dfd | 982 | try |
66e4ab31 | 983 | gfc_add_threadprivate (symbol_attribute *attr, const char *name, locus *where) |
6c7a4dfd | 984 | { |
66e4ab31 | 985 | |
6c7a4dfd JJ |
986 | if (check_used (attr, name, where)) |
987 | return FAILURE; | |
988 | ||
989 | if (attr->threadprivate) | |
990 | { | |
991 | duplicate_attr ("THREADPRIVATE", where); | |
992 | return FAILURE; | |
993 | } | |
994 | ||
995 | attr->threadprivate = 1; | |
996 | return check_conflict (attr, name, where); | |
997 | } | |
998 | ||
999 | ||
6de9cd9a | 1000 | try |
66e4ab31 | 1001 | gfc_add_target (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
1002 | { |
1003 | ||
7114edca | 1004 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
1005 | return FAILURE; |
1006 | ||
1007 | if (attr->target) | |
1008 | { | |
1009 | duplicate_attr ("TARGET", where); | |
1010 | return FAILURE; | |
1011 | } | |
1012 | ||
1013 | attr->target = 1; | |
231b2fcc | 1014 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
1015 | } |
1016 | ||
1017 | ||
1018 | try | |
66e4ab31 | 1019 | gfc_add_dummy (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1020 | { |
1021 | ||
231b2fcc | 1022 | if (check_used (attr, name, where)) |
6de9cd9a DN |
1023 | return FAILURE; |
1024 | ||
eebc3ee0 | 1025 | /* Duplicate dummy arguments are allowed due to ENTRY statements. */ |
6de9cd9a | 1026 | attr->dummy = 1; |
231b2fcc | 1027 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1028 | } |
1029 | ||
1030 | ||
6de9cd9a | 1031 | try |
66e4ab31 | 1032 | gfc_add_in_common (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1033 | { |
1034 | ||
7114edca | 1035 | if (check_used (attr, name, where)) |
6de9cd9a DN |
1036 | return FAILURE; |
1037 | ||
1038 | /* Duplicate attribute already checked for. */ | |
1039 | attr->in_common = 1; | |
231b2fcc | 1040 | if (check_conflict (attr, name, where) == FAILURE) |
6de9cd9a DN |
1041 | return FAILURE; |
1042 | ||
1043 | if (attr->flavor == FL_VARIABLE) | |
1044 | return SUCCESS; | |
e8ec07e1 PT |
1045 | |
1046 | return gfc_add_flavor (attr, FL_VARIABLE, name, where); | |
1047 | } | |
1048 | ||
66e4ab31 | 1049 | |
e8ec07e1 | 1050 | try |
66e4ab31 | 1051 | gfc_add_in_equivalence (symbol_attribute *attr, const char *name, locus *where) |
e8ec07e1 PT |
1052 | { |
1053 | ||
1054 | /* Duplicate attribute already checked for. */ | |
1055 | attr->in_equivalence = 1; | |
1056 | if (check_conflict (attr, name, where) == FAILURE) | |
1057 | return FAILURE; | |
1058 | ||
1059 | if (attr->flavor == FL_VARIABLE) | |
1060 | return SUCCESS; | |
6de9cd9a | 1061 | |
231b2fcc | 1062 | return gfc_add_flavor (attr, FL_VARIABLE, name, where); |
6de9cd9a DN |
1063 | } |
1064 | ||
1065 | ||
9056bd70 | 1066 | try |
231b2fcc | 1067 | gfc_add_data (symbol_attribute *attr, const char *name, locus *where) |
9056bd70 TS |
1068 | { |
1069 | ||
231b2fcc | 1070 | if (check_used (attr, name, where)) |
9056bd70 TS |
1071 | return FAILURE; |
1072 | ||
1073 | attr->data = 1; | |
231b2fcc | 1074 | return check_conflict (attr, name, where); |
9056bd70 TS |
1075 | } |
1076 | ||
1077 | ||
6de9cd9a | 1078 | try |
66e4ab31 | 1079 | gfc_add_in_namelist (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1080 | { |
1081 | ||
1082 | attr->in_namelist = 1; | |
231b2fcc | 1083 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1084 | } |
1085 | ||
1086 | ||
1087 | try | |
66e4ab31 | 1088 | gfc_add_sequence (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1089 | { |
1090 | ||
231b2fcc | 1091 | if (check_used (attr, name, where)) |
6de9cd9a DN |
1092 | return FAILURE; |
1093 | ||
1094 | attr->sequence = 1; | |
231b2fcc | 1095 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1096 | } |
1097 | ||
1098 | ||
1099 | try | |
66e4ab31 | 1100 | gfc_add_elemental (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
1101 | { |
1102 | ||
7114edca | 1103 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
1104 | return FAILURE; |
1105 | ||
1106 | attr->elemental = 1; | |
231b2fcc | 1107 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
1108 | } |
1109 | ||
1110 | ||
1111 | try | |
66e4ab31 | 1112 | gfc_add_pure (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
1113 | { |
1114 | ||
7114edca | 1115 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
1116 | return FAILURE; |
1117 | ||
1118 | attr->pure = 1; | |
231b2fcc | 1119 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
1120 | } |
1121 | ||
1122 | ||
1123 | try | |
66e4ab31 | 1124 | gfc_add_recursive (symbol_attribute *attr, locus *where) |
6de9cd9a DN |
1125 | { |
1126 | ||
7114edca | 1127 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
1128 | return FAILURE; |
1129 | ||
1130 | attr->recursive = 1; | |
231b2fcc | 1131 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
1132 | } |
1133 | ||
1134 | ||
1135 | try | |
66e4ab31 | 1136 | gfc_add_entry (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1137 | { |
1138 | ||
231b2fcc | 1139 | if (check_used (attr, name, where)) |
6de9cd9a DN |
1140 | return FAILURE; |
1141 | ||
1142 | if (attr->entry) | |
1143 | { | |
1144 | duplicate_attr ("ENTRY", where); | |
1145 | return FAILURE; | |
1146 | } | |
1147 | ||
1148 | attr->entry = 1; | |
231b2fcc | 1149 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1150 | } |
1151 | ||
1152 | ||
1153 | try | |
66e4ab31 | 1154 | gfc_add_function (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1155 | { |
1156 | ||
1157 | if (attr->flavor != FL_PROCEDURE | |
231b2fcc | 1158 | && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE) |
6de9cd9a DN |
1159 | return FAILURE; |
1160 | ||
1161 | attr->function = 1; | |
231b2fcc | 1162 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1163 | } |
1164 | ||
1165 | ||
1166 | try | |
66e4ab31 | 1167 | gfc_add_subroutine (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1168 | { |
1169 | ||
1170 | if (attr->flavor != FL_PROCEDURE | |
231b2fcc | 1171 | && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE) |
6de9cd9a DN |
1172 | return FAILURE; |
1173 | ||
1174 | attr->subroutine = 1; | |
231b2fcc | 1175 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1176 | } |
1177 | ||
1178 | ||
1179 | try | |
66e4ab31 | 1180 | gfc_add_generic (symbol_attribute *attr, const char *name, locus *where) |
6de9cd9a DN |
1181 | { |
1182 | ||
1183 | if (attr->flavor != FL_PROCEDURE | |
231b2fcc | 1184 | && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE) |
6de9cd9a DN |
1185 | return FAILURE; |
1186 | ||
1187 | attr->generic = 1; | |
231b2fcc | 1188 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1189 | } |
1190 | ||
1191 | ||
eebc3ee0 | 1192 | /* Flavors are special because some flavors are not what Fortran |
6de9cd9a DN |
1193 | considers attributes and can be reaffirmed multiple times. */ |
1194 | ||
1195 | try | |
66e4ab31 SK |
1196 | gfc_add_flavor (symbol_attribute *attr, sym_flavor f, const char *name, |
1197 | locus *where) | |
6de9cd9a DN |
1198 | { |
1199 | ||
1200 | if ((f == FL_PROGRAM || f == FL_BLOCK_DATA || f == FL_MODULE | |
1201 | || f == FL_PARAMETER || f == FL_LABEL || f == FL_DERIVED | |
231b2fcc | 1202 | || f == FL_NAMELIST) && check_used (attr, name, where)) |
6de9cd9a DN |
1203 | return FAILURE; |
1204 | ||
1205 | if (attr->flavor == f && f == FL_VARIABLE) | |
1206 | return SUCCESS; | |
1207 | ||
1208 | if (attr->flavor != FL_UNKNOWN) | |
1209 | { | |
1210 | if (where == NULL) | |
63645982 | 1211 | where = &gfc_current_locus; |
6de9cd9a | 1212 | |
661051aa DF |
1213 | if (name) |
1214 | gfc_error ("%s attribute of '%s' conflicts with %s attribute at %L", | |
1215 | gfc_code2string (flavors, attr->flavor), name, | |
1216 | gfc_code2string (flavors, f), where); | |
1217 | else | |
1218 | gfc_error ("%s attribute conflicts with %s attribute at %L", | |
1219 | gfc_code2string (flavors, attr->flavor), | |
1220 | gfc_code2string (flavors, f), where); | |
6de9cd9a DN |
1221 | |
1222 | return FAILURE; | |
1223 | } | |
1224 | ||
1225 | attr->flavor = f; | |
1226 | ||
231b2fcc | 1227 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1228 | } |
1229 | ||
1230 | ||
1231 | try | |
66e4ab31 SK |
1232 | gfc_add_procedure (symbol_attribute *attr, procedure_type t, |
1233 | const char *name, locus *where) | |
6de9cd9a DN |
1234 | { |
1235 | ||
7114edca | 1236 | if (check_used (attr, name, where)) |
6de9cd9a DN |
1237 | return FAILURE; |
1238 | ||
1239 | if (attr->flavor != FL_PROCEDURE | |
231b2fcc | 1240 | && gfc_add_flavor (attr, FL_PROCEDURE, name, where) == FAILURE) |
6de9cd9a DN |
1241 | return FAILURE; |
1242 | ||
1243 | if (where == NULL) | |
63645982 | 1244 | where = &gfc_current_locus; |
6de9cd9a DN |
1245 | |
1246 | if (attr->proc != PROC_UNKNOWN) | |
1247 | { | |
31043f6c | 1248 | gfc_error ("%s procedure at %L is already declared as %s procedure", |
6de9cd9a | 1249 | gfc_code2string (procedures, t), where, |
6de9cd9a DN |
1250 | gfc_code2string (procedures, attr->proc)); |
1251 | ||
1252 | return FAILURE; | |
1253 | } | |
1254 | ||
1255 | attr->proc = t; | |
1256 | ||
1257 | /* Statement functions are always scalar and functions. */ | |
1258 | if (t == PROC_ST_FUNCTION | |
231b2fcc | 1259 | && ((!attr->function && gfc_add_function (attr, name, where) == FAILURE) |
6de9cd9a DN |
1260 | || attr->dimension)) |
1261 | return FAILURE; | |
1262 | ||
231b2fcc | 1263 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1264 | } |
1265 | ||
1266 | ||
1267 | try | |
66e4ab31 | 1268 | gfc_add_intent (symbol_attribute *attr, sym_intent intent, locus *where) |
6de9cd9a DN |
1269 | { |
1270 | ||
231b2fcc | 1271 | if (check_used (attr, NULL, where)) |
6de9cd9a DN |
1272 | return FAILURE; |
1273 | ||
1274 | if (attr->intent == INTENT_UNKNOWN) | |
1275 | { | |
1276 | attr->intent = intent; | |
231b2fcc | 1277 | return check_conflict (attr, NULL, where); |
6de9cd9a DN |
1278 | } |
1279 | ||
1280 | if (where == NULL) | |
63645982 | 1281 | where = &gfc_current_locus; |
6de9cd9a DN |
1282 | |
1283 | gfc_error ("INTENT (%s) conflicts with INTENT(%s) at %L", | |
1284 | gfc_intent_string (attr->intent), | |
1285 | gfc_intent_string (intent), where); | |
1286 | ||
1287 | return FAILURE; | |
1288 | } | |
1289 | ||
1290 | ||
1291 | /* No checks for use-association in public and private statements. */ | |
1292 | ||
1293 | try | |
66e4ab31 SK |
1294 | gfc_add_access (symbol_attribute *attr, gfc_access access, |
1295 | const char *name, locus *where) | |
6de9cd9a DN |
1296 | { |
1297 | ||
1298 | if (attr->access == ACCESS_UNKNOWN) | |
1299 | { | |
1300 | attr->access = access; | |
231b2fcc | 1301 | return check_conflict (attr, name, where); |
6de9cd9a DN |
1302 | } |
1303 | ||
1304 | if (where == NULL) | |
63645982 | 1305 | where = &gfc_current_locus; |
6de9cd9a DN |
1306 | gfc_error ("ACCESS specification at %L was already specified", where); |
1307 | ||
1308 | return FAILURE; | |
1309 | } | |
1310 | ||
1311 | ||
a8b3b0b6 CR |
1312 | /* Set the is_bind_c field for the given symbol_attribute. */ |
1313 | ||
1314 | try | |
1315 | gfc_add_is_bind_c (symbol_attribute *attr, const char *name, locus *where, | |
1316 | int is_proc_lang_bind_spec) | |
1317 | { | |
1318 | ||
1319 | if (is_proc_lang_bind_spec == 0 && attr->flavor == FL_PROCEDURE) | |
1320 | gfc_error_now ("BIND(C) attribute at %L can only be used for " | |
1321 | "variables or common blocks", where); | |
1322 | else if (attr->is_bind_c) | |
1323 | gfc_error_now ("Duplicate BIND attribute specified at %L", where); | |
1324 | else | |
1325 | attr->is_bind_c = 1; | |
1326 | ||
1327 | if (where == NULL) | |
1328 | where = &gfc_current_locus; | |
1329 | ||
1330 | if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: BIND(C) at %L", where) | |
1331 | == FAILURE) | |
1332 | return FAILURE; | |
1333 | ||
1334 | return check_conflict (attr, name, where); | |
1335 | } | |
1336 | ||
1337 | ||
6de9cd9a | 1338 | try |
a8b3b0b6 CR |
1339 | gfc_add_explicit_interface (gfc_symbol *sym, ifsrc source, |
1340 | gfc_formal_arglist * formal, locus *where) | |
6de9cd9a DN |
1341 | { |
1342 | ||
231b2fcc | 1343 | if (check_used (&sym->attr, sym->name, where)) |
6de9cd9a DN |
1344 | return FAILURE; |
1345 | ||
1346 | if (where == NULL) | |
63645982 | 1347 | where = &gfc_current_locus; |
6de9cd9a DN |
1348 | |
1349 | if (sym->attr.if_source != IFSRC_UNKNOWN | |
1350 | && sym->attr.if_source != IFSRC_DECL) | |
1351 | { | |
1352 | gfc_error ("Symbol '%s' at %L already has an explicit interface", | |
1353 | sym->name, where); | |
1354 | return FAILURE; | |
1355 | } | |
1356 | ||
1357 | sym->formal = formal; | |
1358 | sym->attr.if_source = source; | |
1359 | ||
1360 | return SUCCESS; | |
1361 | } | |
1362 | ||
1363 | ||
1364 | /* Add a type to a symbol. */ | |
1365 | ||
1366 | try | |
66e4ab31 | 1367 | gfc_add_type (gfc_symbol *sym, gfc_typespec *ts, locus *where) |
6de9cd9a DN |
1368 | { |
1369 | sym_flavor flavor; | |
1370 | ||
6de9cd9a | 1371 | if (where == NULL) |
63645982 | 1372 | where = &gfc_current_locus; |
6de9cd9a DN |
1373 | |
1374 | if (sym->ts.type != BT_UNKNOWN) | |
1375 | { | |
6690a9e0 PT |
1376 | const char *msg = "Symbol '%s' at %L already has basic type of %s"; |
1377 | if (!(sym->ts.type == ts->type | |
66e4ab31 SK |
1378 | && (sym->attr.flavor == FL_PROCEDURE || sym->attr.result)) |
1379 | || gfc_notification_std (GFC_STD_GNU) == ERROR | |
1380 | || pedantic) | |
6690a9e0 PT |
1381 | { |
1382 | gfc_error (msg, sym->name, where, gfc_basic_typename (sym->ts.type)); | |
1383 | return FAILURE; | |
1384 | } | |
1385 | else if (gfc_notify_std (GFC_STD_GNU, msg, sym->name, where, | |
1386 | gfc_basic_typename (sym->ts.type)) == FAILURE) | |
66e4ab31 | 1387 | return FAILURE; |
6de9cd9a DN |
1388 | } |
1389 | ||
1390 | flavor = sym->attr.flavor; | |
1391 | ||
1392 | if (flavor == FL_PROGRAM || flavor == FL_BLOCK_DATA || flavor == FL_MODULE | |
66e4ab31 SK |
1393 | || flavor == FL_LABEL |
1394 | || (flavor == FL_PROCEDURE && sym->attr.subroutine) | |
6de9cd9a DN |
1395 | || flavor == FL_DERIVED || flavor == FL_NAMELIST) |
1396 | { | |
1397 | gfc_error ("Symbol '%s' at %L cannot have a type", sym->name, where); | |
1398 | return FAILURE; | |
1399 | } | |
1400 | ||
1401 | sym->ts = *ts; | |
1402 | return SUCCESS; | |
1403 | } | |
1404 | ||
1405 | ||
1406 | /* Clears all attributes. */ | |
1407 | ||
1408 | void | |
66e4ab31 | 1409 | gfc_clear_attr (symbol_attribute *attr) |
6de9cd9a | 1410 | { |
66e4ab31 | 1411 | memset (attr, 0, sizeof (symbol_attribute)); |
6de9cd9a DN |
1412 | } |
1413 | ||
1414 | ||
1415 | /* Check for missing attributes in the new symbol. Currently does | |
1416 | nothing, but it's not clear that it is unnecessary yet. */ | |
1417 | ||
1418 | try | |
66e4ab31 SK |
1419 | gfc_missing_attr (symbol_attribute *attr ATTRIBUTE_UNUSED, |
1420 | locus *where ATTRIBUTE_UNUSED) | |
6de9cd9a DN |
1421 | { |
1422 | ||
1423 | return SUCCESS; | |
1424 | } | |
1425 | ||
1426 | ||
1427 | /* Copy an attribute to a symbol attribute, bit by bit. Some | |
1428 | attributes have a lot of side-effects but cannot be present given | |
1429 | where we are called from, so we ignore some bits. */ | |
1430 | ||
1431 | try | |
a8b3b0b6 | 1432 | gfc_copy_attr (symbol_attribute *dest, symbol_attribute *src, locus *where) |
6de9cd9a | 1433 | { |
a8b3b0b6 CR |
1434 | int is_proc_lang_bind_spec; |
1435 | ||
6de9cd9a DN |
1436 | if (src->allocatable && gfc_add_allocatable (dest, where) == FAILURE) |
1437 | goto fail; | |
1438 | ||
231b2fcc | 1439 | if (src->dimension && gfc_add_dimension (dest, NULL, where) == FAILURE) |
6de9cd9a DN |
1440 | goto fail; |
1441 | if (src->optional && gfc_add_optional (dest, where) == FAILURE) | |
1442 | goto fail; | |
1443 | if (src->pointer && gfc_add_pointer (dest, where) == FAILURE) | |
1444 | goto fail; | |
ee7e677f TB |
1445 | if (src->protected && gfc_add_protected (dest, NULL, where) == FAILURE) |
1446 | goto fail; | |
231b2fcc | 1447 | if (src->save && gfc_add_save (dest, NULL, where) == FAILURE) |
6de9cd9a | 1448 | goto fail; |
06469efd PT |
1449 | if (src->value && gfc_add_value (dest, NULL, where) == FAILURE) |
1450 | goto fail; | |
775e6c3a TB |
1451 | if (src->volatile_ && gfc_add_volatile (dest, NULL, where) == FAILURE) |
1452 | goto fail; | |
66e4ab31 SK |
1453 | if (src->threadprivate |
1454 | && gfc_add_threadprivate (dest, NULL, where) == FAILURE) | |
6c7a4dfd | 1455 | goto fail; |
6de9cd9a DN |
1456 | if (src->target && gfc_add_target (dest, where) == FAILURE) |
1457 | goto fail; | |
231b2fcc | 1458 | if (src->dummy && gfc_add_dummy (dest, NULL, where) == FAILURE) |
6de9cd9a | 1459 | goto fail; |
231b2fcc | 1460 | if (src->result && gfc_add_result (dest, NULL, where) == FAILURE) |
6de9cd9a DN |
1461 | goto fail; |
1462 | if (src->entry) | |
1463 | dest->entry = 1; | |
1464 | ||
231b2fcc | 1465 | if (src->in_namelist && gfc_add_in_namelist (dest, NULL, where) == FAILURE) |
6de9cd9a DN |
1466 | goto fail; |
1467 | ||
231b2fcc | 1468 | if (src->in_common && gfc_add_in_common (dest, NULL, where) == FAILURE) |
6de9cd9a | 1469 | goto fail; |
6de9cd9a | 1470 | |
231b2fcc | 1471 | if (src->generic && gfc_add_generic (dest, NULL, where) == FAILURE) |
6de9cd9a | 1472 | goto fail; |
231b2fcc | 1473 | if (src->function && gfc_add_function (dest, NULL, where) == FAILURE) |
6de9cd9a | 1474 | goto fail; |
231b2fcc | 1475 | if (src->subroutine && gfc_add_subroutine (dest, NULL, where) == FAILURE) |
6de9cd9a DN |
1476 | goto fail; |
1477 | ||
231b2fcc | 1478 | if (src->sequence && gfc_add_sequence (dest, NULL, where) == FAILURE) |
6de9cd9a DN |
1479 | goto fail; |
1480 | if (src->elemental && gfc_add_elemental (dest, where) == FAILURE) | |
1481 | goto fail; | |
1482 | if (src->pure && gfc_add_pure (dest, where) == FAILURE) | |
1483 | goto fail; | |
1484 | if (src->recursive && gfc_add_recursive (dest, where) == FAILURE) | |
1485 | goto fail; | |
1486 | ||
1487 | if (src->flavor != FL_UNKNOWN | |
231b2fcc | 1488 | && gfc_add_flavor (dest, src->flavor, NULL, where) == FAILURE) |
6de9cd9a DN |
1489 | goto fail; |
1490 | ||
1491 | if (src->intent != INTENT_UNKNOWN | |
1492 | && gfc_add_intent (dest, src->intent, where) == FAILURE) | |
1493 | goto fail; | |
1494 | ||
1495 | if (src->access != ACCESS_UNKNOWN | |
231b2fcc | 1496 | && gfc_add_access (dest, src->access, NULL, where) == FAILURE) |
6de9cd9a DN |
1497 | goto fail; |
1498 | ||
1499 | if (gfc_missing_attr (dest, where) == FAILURE) | |
1500 | goto fail; | |
1501 | ||
83d890b9 AL |
1502 | if (src->cray_pointer && gfc_add_cray_pointer (dest, where) == FAILURE) |
1503 | goto fail; | |
1504 | if (src->cray_pointee && gfc_add_cray_pointee (dest, where) == FAILURE) | |
1505 | goto fail; | |
23bc73b5 | 1506 | |
a8b3b0b6 CR |
1507 | is_proc_lang_bind_spec = (src->flavor == FL_PROCEDURE ? 1 : 0); |
1508 | if (src->is_bind_c | |
1509 | && gfc_add_is_bind_c (dest, NULL, where, is_proc_lang_bind_spec) | |
1510 | != SUCCESS) | |
1511 | return FAILURE; | |
1512 | ||
1513 | if (src->is_c_interop) | |
1514 | dest->is_c_interop = 1; | |
1515 | if (src->is_iso_c) | |
1516 | dest->is_iso_c = 1; | |
1517 | ||
23bc73b5 DF |
1518 | if (src->external && gfc_add_external (dest, where) == FAILURE) |
1519 | goto fail; | |
1520 | if (src->intrinsic && gfc_add_intrinsic (dest, where) == FAILURE) | |
1521 | goto fail; | |
6de9cd9a DN |
1522 | |
1523 | return SUCCESS; | |
1524 | ||
1525 | fail: | |
1526 | return FAILURE; | |
1527 | } | |
1528 | ||
1529 | ||
1530 | /************** Component name management ************/ | |
1531 | ||
1532 | /* Component names of a derived type form their own little namespaces | |
1533 | that are separate from all other spaces. The space is composed of | |
1534 | a singly linked list of gfc_component structures whose head is | |
1535 | located in the parent symbol. */ | |
1536 | ||
1537 | ||
1538 | /* Add a component name to a symbol. The call fails if the name is | |
1539 | already present. On success, the component pointer is modified to | |
1540 | point to the additional component structure. */ | |
1541 | ||
1542 | try | |
66e4ab31 SK |
1543 | gfc_add_component (gfc_symbol *sym, const char *name, |
1544 | gfc_component **component) | |
6de9cd9a DN |
1545 | { |
1546 | gfc_component *p, *tail; | |
1547 | ||
1548 | tail = NULL; | |
1549 | ||
1550 | for (p = sym->components; p; p = p->next) | |
1551 | { | |
1552 | if (strcmp (p->name, name) == 0) | |
1553 | { | |
1554 | gfc_error ("Component '%s' at %C already declared at %L", | |
1555 | name, &p->loc); | |
1556 | return FAILURE; | |
1557 | } | |
1558 | ||
1559 | tail = p; | |
1560 | } | |
1561 | ||
eebc3ee0 | 1562 | /* Allocate a new component. */ |
6de9cd9a DN |
1563 | p = gfc_get_component (); |
1564 | ||
1565 | if (tail == NULL) | |
1566 | sym->components = p; | |
1567 | else | |
1568 | tail->next = p; | |
1569 | ||
cb9e4f55 | 1570 | p->name = gfc_get_string (name); |
63645982 | 1571 | p->loc = gfc_current_locus; |
6de9cd9a DN |
1572 | |
1573 | *component = p; | |
1574 | return SUCCESS; | |
1575 | } | |
1576 | ||
1577 | ||
6b887797 PT |
1578 | /* Recursive function to switch derived types of all symbol in a |
1579 | namespace. */ | |
6de9cd9a DN |
1580 | |
1581 | static void | |
66e4ab31 | 1582 | switch_types (gfc_symtree *st, gfc_symbol *from, gfc_symbol *to) |
6de9cd9a DN |
1583 | { |
1584 | gfc_symbol *sym; | |
1585 | ||
1586 | if (st == NULL) | |
1587 | return; | |
1588 | ||
1589 | sym = st->n.sym; | |
1590 | if (sym->ts.type == BT_DERIVED && sym->ts.derived == from) | |
1591 | sym->ts.derived = to; | |
1592 | ||
1593 | switch_types (st->left, from, to); | |
1594 | switch_types (st->right, from, to); | |
1595 | } | |
1596 | ||
1597 | ||
1598 | /* This subroutine is called when a derived type is used in order to | |
1599 | make the final determination about which version to use. The | |
1600 | standard requires that a type be defined before it is 'used', but | |
1601 | such types can appear in IMPLICIT statements before the actual | |
1602 | definition. 'Using' in this context means declaring a variable to | |
1603 | be that type or using the type constructor. | |
1604 | ||
1605 | If a type is used and the components haven't been defined, then we | |
1606 | have to have a derived type in a parent unit. We find the node in | |
1607 | the other namespace and point the symtree node in this namespace to | |
1608 | that node. Further reference to this name point to the correct | |
eebc3ee0 | 1609 | node. If we can't find the node in a parent namespace, then we have |
6de9cd9a DN |
1610 | an error. |
1611 | ||
1612 | This subroutine takes a pointer to a symbol node and returns a | |
1613 | pointer to the translated node or NULL for an error. Usually there | |
1614 | is no translation and we return the node we were passed. */ | |
1615 | ||
1e6283cb | 1616 | gfc_symbol * |
66e4ab31 | 1617 | gfc_use_derived (gfc_symbol *sym) |
6de9cd9a | 1618 | { |
810306f2 | 1619 | gfc_symbol *s; |
6de9cd9a DN |
1620 | gfc_typespec *t; |
1621 | gfc_symtree *st; | |
1622 | int i; | |
1623 | ||
6b887797 PT |
1624 | if (sym->components != NULL) |
1625 | return sym; /* Already defined. */ | |
3e978d30 | 1626 | |
6b887797 PT |
1627 | if (sym->ns->parent == NULL) |
1628 | goto bad; | |
6de9cd9a DN |
1629 | |
1630 | if (gfc_find_symbol (sym->name, sym->ns->parent, 1, &s)) | |
1631 | { | |
1632 | gfc_error ("Symbol '%s' at %C is ambiguous", sym->name); | |
1633 | return NULL; | |
1634 | } | |
1635 | ||
1636 | if (s == NULL || s->attr.flavor != FL_DERIVED) | |
1637 | goto bad; | |
1638 | ||
1639 | /* Get rid of symbol sym, translating all references to s. */ | |
1640 | for (i = 0; i < GFC_LETTERS; i++) | |
1641 | { | |
1642 | t = &sym->ns->default_type[i]; | |
1643 | if (t->derived == sym) | |
1644 | t->derived = s; | |
1645 | } | |
1646 | ||
1647 | st = gfc_find_symtree (sym->ns->sym_root, sym->name); | |
1648 | st->n.sym = s; | |
1649 | ||
1650 | s->refs++; | |
1651 | ||
1652 | /* Unlink from list of modified symbols. */ | |
810306f2 | 1653 | gfc_commit_symbol (sym); |
6de9cd9a DN |
1654 | |
1655 | switch_types (sym->ns->sym_root, sym, s); | |
1656 | ||
1657 | /* TODO: Also have to replace sym -> s in other lists like | |
1658 | namelists, common lists and interface lists. */ | |
1659 | gfc_free_symbol (sym); | |
1660 | ||
1e6283cb | 1661 | return s; |
6de9cd9a DN |
1662 | |
1663 | bad: | |
1664 | gfc_error ("Derived type '%s' at %C is being used before it is defined", | |
1665 | sym->name); | |
1666 | return NULL; | |
1667 | } | |
1668 | ||
1669 | ||
6de9cd9a DN |
1670 | /* Given a derived type node and a component name, try to locate the |
1671 | component structure. Returns the NULL pointer if the component is | |
1672 | not found or the components are private. */ | |
1673 | ||
1674 | gfc_component * | |
66e4ab31 | 1675 | gfc_find_component (gfc_symbol *sym, const char *name) |
6de9cd9a DN |
1676 | { |
1677 | gfc_component *p; | |
1678 | ||
1679 | if (name == NULL) | |
1680 | return NULL; | |
1681 | ||
1682 | sym = gfc_use_derived (sym); | |
1683 | ||
1684 | if (sym == NULL) | |
1685 | return NULL; | |
1686 | ||
1687 | for (p = sym->components; p; p = p->next) | |
1688 | if (strcmp (p->name, name) == 0) | |
1689 | break; | |
1690 | ||
1691 | if (p == NULL) | |
1692 | gfc_error ("'%s' at %C is not a member of the '%s' structure", | |
1693 | name, sym->name); | |
1694 | else | |
1695 | { | |
2eae3dc7 TB |
1696 | if (sym->attr.use_assoc && (sym->component_access == ACCESS_PRIVATE |
1697 | || p->access == ACCESS_PRIVATE)) | |
6de9cd9a DN |
1698 | { |
1699 | gfc_error ("Component '%s' at %C is a PRIVATE component of '%s'", | |
1700 | name, sym->name); | |
1701 | p = NULL; | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | return p; | |
1706 | } | |
1707 | ||
1708 | ||
1709 | /* Given a symbol, free all of the component structures and everything | |
1710 | they point to. */ | |
1711 | ||
1712 | static void | |
66e4ab31 | 1713 | free_components (gfc_component *p) |
6de9cd9a DN |
1714 | { |
1715 | gfc_component *q; | |
1716 | ||
1717 | for (; p; p = q) | |
1718 | { | |
1719 | q = p->next; | |
1720 | ||
1721 | gfc_free_array_spec (p->as); | |
1722 | gfc_free_expr (p->initializer); | |
1723 | ||
1724 | gfc_free (p); | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | ||
66e4ab31 | 1729 | /* Set component attributes from a standard symbol attribute structure. */ |
6de9cd9a DN |
1730 | |
1731 | void | |
66e4ab31 | 1732 | gfc_set_component_attr (gfc_component *c, symbol_attribute *attr) |
6de9cd9a DN |
1733 | { |
1734 | ||
1735 | c->dimension = attr->dimension; | |
1736 | c->pointer = attr->pointer; | |
5046aff5 | 1737 | c->allocatable = attr->allocatable; |
2eae3dc7 | 1738 | c->access = attr->access; |
6de9cd9a DN |
1739 | } |
1740 | ||
1741 | ||
1742 | /* Get a standard symbol attribute structure given the component | |
1743 | structure. */ | |
1744 | ||
1745 | void | |
66e4ab31 | 1746 | gfc_get_component_attr (symbol_attribute *attr, gfc_component *c) |
6de9cd9a DN |
1747 | { |
1748 | ||
1749 | gfc_clear_attr (attr); | |
1750 | attr->dimension = c->dimension; | |
1751 | attr->pointer = c->pointer; | |
5046aff5 | 1752 | attr->allocatable = c->allocatable; |
2eae3dc7 | 1753 | attr->access = c->access; |
6de9cd9a DN |
1754 | } |
1755 | ||
1756 | ||
1757 | /******************** Statement label management ********************/ | |
1758 | ||
5cf54585 TS |
1759 | /* Comparison function for statement labels, used for managing the |
1760 | binary tree. */ | |
1761 | ||
1762 | static int | |
66e4ab31 | 1763 | compare_st_labels (void *a1, void *b1) |
5cf54585 | 1764 | { |
66e4ab31 SK |
1765 | int a = ((gfc_st_label *) a1)->value; |
1766 | int b = ((gfc_st_label *) b1)->value; | |
5cf54585 TS |
1767 | |
1768 | return (b - a); | |
1769 | } | |
1770 | ||
1771 | ||
1772 | /* Free a single gfc_st_label structure, making sure the tree is not | |
6de9cd9a DN |
1773 | messed up. This function is called only when some parse error |
1774 | occurs. */ | |
1775 | ||
1776 | void | |
66e4ab31 | 1777 | gfc_free_st_label (gfc_st_label *label) |
6de9cd9a | 1778 | { |
66e4ab31 | 1779 | |
b5cbe7ee | 1780 | if (label == NULL) |
6de9cd9a DN |
1781 | return; |
1782 | ||
5cf54585 | 1783 | gfc_delete_bbt (&gfc_current_ns->st_labels, label, compare_st_labels); |
b5cbe7ee SK |
1784 | |
1785 | if (label->format != NULL) | |
1786 | gfc_free_expr (label->format); | |
1787 | ||
1788 | gfc_free (label); | |
6de9cd9a DN |
1789 | } |
1790 | ||
66e4ab31 | 1791 | |
5cf54585 | 1792 | /* Free a whole tree of gfc_st_label structures. */ |
6de9cd9a DN |
1793 | |
1794 | static void | |
66e4ab31 | 1795 | free_st_labels (gfc_st_label *label) |
6de9cd9a | 1796 | { |
66e4ab31 | 1797 | |
5cf54585 TS |
1798 | if (label == NULL) |
1799 | return; | |
6de9cd9a | 1800 | |
5cf54585 TS |
1801 | free_st_labels (label->left); |
1802 | free_st_labels (label->right); | |
1803 | ||
1804 | if (label->format != NULL) | |
1805 | gfc_free_expr (label->format); | |
1806 | gfc_free (label); | |
6de9cd9a DN |
1807 | } |
1808 | ||
1809 | ||
1810 | /* Given a label number, search for and return a pointer to the label | |
1811 | structure, creating it if it does not exist. */ | |
1812 | ||
1813 | gfc_st_label * | |
1814 | gfc_get_st_label (int labelno) | |
1815 | { | |
1816 | gfc_st_label *lp; | |
1817 | ||
1818 | /* First see if the label is already in this namespace. */ | |
5cf54585 TS |
1819 | lp = gfc_current_ns->st_labels; |
1820 | while (lp) | |
1821 | { | |
1822 | if (lp->value == labelno) | |
1823 | return lp; | |
1824 | ||
1825 | if (lp->value < labelno) | |
1826 | lp = lp->left; | |
1827 | else | |
1828 | lp = lp->right; | |
1829 | } | |
6de9cd9a DN |
1830 | |
1831 | lp = gfc_getmem (sizeof (gfc_st_label)); | |
1832 | ||
1833 | lp->value = labelno; | |
1834 | lp->defined = ST_LABEL_UNKNOWN; | |
1835 | lp->referenced = ST_LABEL_UNKNOWN; | |
1836 | ||
5cf54585 | 1837 | gfc_insert_bbt (&gfc_current_ns->st_labels, lp, compare_st_labels); |
6de9cd9a DN |
1838 | |
1839 | return lp; | |
1840 | } | |
1841 | ||
1842 | ||
1843 | /* Called when a statement with a statement label is about to be | |
1844 | accepted. We add the label to the list of the current namespace, | |
1845 | making sure it hasn't been defined previously and referenced | |
1846 | correctly. */ | |
1847 | ||
1848 | void | |
66e4ab31 | 1849 | gfc_define_st_label (gfc_st_label *lp, gfc_sl_type type, locus *label_locus) |
6de9cd9a DN |
1850 | { |
1851 | int labelno; | |
1852 | ||
1853 | labelno = lp->value; | |
1854 | ||
1855 | if (lp->defined != ST_LABEL_UNKNOWN) | |
1856 | gfc_error ("Duplicate statement label %d at %L and %L", labelno, | |
1857 | &lp->where, label_locus); | |
1858 | else | |
1859 | { | |
1860 | lp->where = *label_locus; | |
1861 | ||
1862 | switch (type) | |
1863 | { | |
1864 | case ST_LABEL_FORMAT: | |
1865 | if (lp->referenced == ST_LABEL_TARGET) | |
1866 | gfc_error ("Label %d at %C already referenced as branch target", | |
1867 | labelno); | |
1868 | else | |
1869 | lp->defined = ST_LABEL_FORMAT; | |
1870 | ||
1871 | break; | |
1872 | ||
1873 | case ST_LABEL_TARGET: | |
1874 | if (lp->referenced == ST_LABEL_FORMAT) | |
1875 | gfc_error ("Label %d at %C already referenced as a format label", | |
1876 | labelno); | |
1877 | else | |
1878 | lp->defined = ST_LABEL_TARGET; | |
1879 | ||
1880 | break; | |
1881 | ||
1882 | default: | |
1883 | lp->defined = ST_LABEL_BAD_TARGET; | |
1884 | lp->referenced = ST_LABEL_BAD_TARGET; | |
1885 | } | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | ||
1890 | /* Reference a label. Given a label and its type, see if that | |
1891 | reference is consistent with what is known about that label, | |
1892 | updating the unknown state. Returns FAILURE if something goes | |
1893 | wrong. */ | |
1894 | ||
1895 | try | |
66e4ab31 | 1896 | gfc_reference_st_label (gfc_st_label *lp, gfc_sl_type type) |
6de9cd9a DN |
1897 | { |
1898 | gfc_sl_type label_type; | |
1899 | int labelno; | |
1900 | try rc; | |
1901 | ||
1902 | if (lp == NULL) | |
1903 | return SUCCESS; | |
1904 | ||
1905 | labelno = lp->value; | |
1906 | ||
1907 | if (lp->defined != ST_LABEL_UNKNOWN) | |
1908 | label_type = lp->defined; | |
1909 | else | |
1910 | { | |
1911 | label_type = lp->referenced; | |
63645982 | 1912 | lp->where = gfc_current_locus; |
6de9cd9a DN |
1913 | } |
1914 | ||
1915 | if (label_type == ST_LABEL_FORMAT && type == ST_LABEL_TARGET) | |
1916 | { | |
1917 | gfc_error ("Label %d at %C previously used as a FORMAT label", labelno); | |
1918 | rc = FAILURE; | |
1919 | goto done; | |
1920 | } | |
1921 | ||
1922 | if ((label_type == ST_LABEL_TARGET || label_type == ST_LABEL_BAD_TARGET) | |
1923 | && type == ST_LABEL_FORMAT) | |
1924 | { | |
1925 | gfc_error ("Label %d at %C previously used as branch target", labelno); | |
1926 | rc = FAILURE; | |
1927 | goto done; | |
1928 | } | |
1929 | ||
1930 | lp->referenced = type; | |
1931 | rc = SUCCESS; | |
1932 | ||
1933 | done: | |
1934 | return rc; | |
1935 | } | |
1936 | ||
1937 | ||
1938 | /************** Symbol table management subroutines ****************/ | |
1939 | ||
1940 | /* Basic details: Fortran 95 requires a potentially unlimited number | |
1941 | of distinct namespaces when compiling a program unit. This case | |
1942 | occurs during a compilation of internal subprograms because all of | |
1943 | the internal subprograms must be read before we can start | |
1944 | generating code for the host. | |
1945 | ||
eebc3ee0 | 1946 | Given the tricky nature of the Fortran grammar, we must be able to |
6de9cd9a DN |
1947 | undo changes made to a symbol table if the current interpretation |
1948 | of a statement is found to be incorrect. Whenever a symbol is | |
1949 | looked up, we make a copy of it and link to it. All of these | |
1950 | symbols are kept in a singly linked list so that we can commit or | |
1951 | undo the changes at a later time. | |
1952 | ||
4f613946 | 1953 | A symtree may point to a symbol node outside of its namespace. In |
6de9cd9a DN |
1954 | this case, that symbol has been used as a host associated variable |
1955 | at some previous time. */ | |
1956 | ||
0366dfe9 TS |
1957 | /* Allocate a new namespace structure. Copies the implicit types from |
1958 | PARENT if PARENT_TYPES is set. */ | |
6de9cd9a DN |
1959 | |
1960 | gfc_namespace * | |
66e4ab31 | 1961 | gfc_get_namespace (gfc_namespace *parent, int parent_types) |
6de9cd9a DN |
1962 | { |
1963 | gfc_namespace *ns; | |
1964 | gfc_typespec *ts; | |
1965 | gfc_intrinsic_op in; | |
1966 | int i; | |
1967 | ||
1968 | ns = gfc_getmem (sizeof (gfc_namespace)); | |
1969 | ns->sym_root = NULL; | |
1970 | ns->uop_root = NULL; | |
1971 | ns->default_access = ACCESS_UNKNOWN; | |
1972 | ns->parent = parent; | |
1973 | ||
1974 | for (in = GFC_INTRINSIC_BEGIN; in != GFC_INTRINSIC_END; in++) | |
1975 | ns->operator_access[in] = ACCESS_UNKNOWN; | |
1976 | ||
1977 | /* Initialize default implicit types. */ | |
1978 | for (i = 'a'; i <= 'z'; i++) | |
1979 | { | |
1980 | ns->set_flag[i - 'a'] = 0; | |
1981 | ts = &ns->default_type[i - 'a']; | |
1982 | ||
0366dfe9 | 1983 | if (parent_types && ns->parent != NULL) |
6de9cd9a | 1984 | { |
66e4ab31 | 1985 | /* Copy parent settings. */ |
6de9cd9a DN |
1986 | *ts = ns->parent->default_type[i - 'a']; |
1987 | continue; | |
1988 | } | |
1989 | ||
1990 | if (gfc_option.flag_implicit_none != 0) | |
1991 | { | |
1992 | gfc_clear_ts (ts); | |
1993 | continue; | |
1994 | } | |
1995 | ||
1996 | if ('i' <= i && i <= 'n') | |
1997 | { | |
1998 | ts->type = BT_INTEGER; | |
9d64df18 | 1999 | ts->kind = gfc_default_integer_kind; |
6de9cd9a DN |
2000 | } |
2001 | else | |
2002 | { | |
2003 | ts->type = BT_REAL; | |
9d64df18 | 2004 | ts->kind = gfc_default_real_kind; |
6de9cd9a DN |
2005 | } |
2006 | } | |
2007 | ||
3d79abbd PB |
2008 | ns->refs = 1; |
2009 | ||
6de9cd9a DN |
2010 | return ns; |
2011 | } | |
2012 | ||
2013 | ||
2014 | /* Comparison function for symtree nodes. */ | |
2015 | ||
2016 | static int | |
66e4ab31 | 2017 | compare_symtree (void *_st1, void *_st2) |
6de9cd9a DN |
2018 | { |
2019 | gfc_symtree *st1, *st2; | |
2020 | ||
2021 | st1 = (gfc_symtree *) _st1; | |
2022 | st2 = (gfc_symtree *) _st2; | |
2023 | ||
2024 | return strcmp (st1->name, st2->name); | |
2025 | } | |
2026 | ||
2027 | ||
2028 | /* Allocate a new symtree node and associate it with the new symbol. */ | |
2029 | ||
2030 | gfc_symtree * | |
66e4ab31 | 2031 | gfc_new_symtree (gfc_symtree **root, const char *name) |
6de9cd9a DN |
2032 | { |
2033 | gfc_symtree *st; | |
2034 | ||
2035 | st = gfc_getmem (sizeof (gfc_symtree)); | |
cb9e4f55 | 2036 | st->name = gfc_get_string (name); |
6de9cd9a DN |
2037 | |
2038 | gfc_insert_bbt (root, st, compare_symtree); | |
2039 | return st; | |
2040 | } | |
2041 | ||
2042 | ||
2043 | /* Delete a symbol from the tree. Does not free the symbol itself! */ | |
2044 | ||
2045 | static void | |
66e4ab31 | 2046 | delete_symtree (gfc_symtree **root, const char *name) |
6de9cd9a DN |
2047 | { |
2048 | gfc_symtree st, *st0; | |
2049 | ||
2050 | st0 = gfc_find_symtree (*root, name); | |
2051 | ||
cb9e4f55 | 2052 | st.name = gfc_get_string (name); |
6de9cd9a DN |
2053 | gfc_delete_bbt (root, &st, compare_symtree); |
2054 | ||
2055 | gfc_free (st0); | |
2056 | } | |
2057 | ||
2058 | ||
2059 | /* Given a root symtree node and a name, try to find the symbol within | |
2060 | the namespace. Returns NULL if the symbol is not found. */ | |
2061 | ||
2062 | gfc_symtree * | |
66e4ab31 | 2063 | gfc_find_symtree (gfc_symtree *st, const char *name) |
6de9cd9a DN |
2064 | { |
2065 | int c; | |
2066 | ||
2067 | while (st != NULL) | |
2068 | { | |
2069 | c = strcmp (name, st->name); | |
2070 | if (c == 0) | |
2071 | return st; | |
2072 | ||
2073 | st = (c < 0) ? st->left : st->right; | |
2074 | } | |
2075 | ||
2076 | return NULL; | |
2077 | } | |
2078 | ||
2079 | ||
2080 | /* Given a name find a user operator node, creating it if it doesn't | |
2081 | exist. These are much simpler than symbols because they can't be | |
2082 | ambiguous with one another. */ | |
2083 | ||
2084 | gfc_user_op * | |
2085 | gfc_get_uop (const char *name) | |
2086 | { | |
2087 | gfc_user_op *uop; | |
2088 | gfc_symtree *st; | |
2089 | ||
2090 | st = gfc_find_symtree (gfc_current_ns->uop_root, name); | |
2091 | if (st != NULL) | |
2092 | return st->n.uop; | |
2093 | ||
2094 | st = gfc_new_symtree (&gfc_current_ns->uop_root, name); | |
2095 | ||
2096 | uop = st->n.uop = gfc_getmem (sizeof (gfc_user_op)); | |
cb9e4f55 | 2097 | uop->name = gfc_get_string (name); |
6de9cd9a DN |
2098 | uop->access = ACCESS_UNKNOWN; |
2099 | uop->ns = gfc_current_ns; | |
2100 | ||
2101 | return uop; | |
2102 | } | |
2103 | ||
2104 | ||
2105 | /* Given a name find the user operator node. Returns NULL if it does | |
2106 | not exist. */ | |
2107 | ||
2108 | gfc_user_op * | |
66e4ab31 | 2109 | gfc_find_uop (const char *name, gfc_namespace *ns) |
6de9cd9a DN |
2110 | { |
2111 | gfc_symtree *st; | |
2112 | ||
2113 | if (ns == NULL) | |
2114 | ns = gfc_current_ns; | |
2115 | ||
2116 | st = gfc_find_symtree (ns->uop_root, name); | |
2117 | return (st == NULL) ? NULL : st->n.uop; | |
2118 | } | |
2119 | ||
2120 | ||
2121 | /* Remove a gfc_symbol structure and everything it points to. */ | |
2122 | ||
2123 | void | |
66e4ab31 | 2124 | gfc_free_symbol (gfc_symbol *sym) |
6de9cd9a DN |
2125 | { |
2126 | ||
2127 | if (sym == NULL) | |
2128 | return; | |
2129 | ||
2130 | gfc_free_array_spec (sym->as); | |
2131 | ||
2132 | free_components (sym->components); | |
2133 | ||
2134 | gfc_free_expr (sym->value); | |
2135 | ||
2136 | gfc_free_namelist (sym->namelist); | |
2137 | ||
2138 | gfc_free_namespace (sym->formal_ns); | |
2139 | ||
1027275d PT |
2140 | if (!sym->attr.generic_copy) |
2141 | gfc_free_interface (sym->generic); | |
6de9cd9a DN |
2142 | |
2143 | gfc_free_formal_arglist (sym->formal); | |
2144 | ||
2145 | gfc_free (sym); | |
2146 | } | |
2147 | ||
2148 | ||
2149 | /* Allocate and initialize a new symbol node. */ | |
2150 | ||
2151 | gfc_symbol * | |
66e4ab31 | 2152 | gfc_new_symbol (const char *name, gfc_namespace *ns) |
6de9cd9a DN |
2153 | { |
2154 | gfc_symbol *p; | |
2155 | ||
2156 | p = gfc_getmem (sizeof (gfc_symbol)); | |
2157 | ||
2158 | gfc_clear_ts (&p->ts); | |
2159 | gfc_clear_attr (&p->attr); | |
2160 | p->ns = ns; | |
2161 | ||
63645982 | 2162 | p->declared_at = gfc_current_locus; |
6de9cd9a DN |
2163 | |
2164 | if (strlen (name) > GFC_MAX_SYMBOL_LEN) | |
2165 | gfc_internal_error ("new_symbol(): Symbol name too long"); | |
2166 | ||
cb9e4f55 | 2167 | p->name = gfc_get_string (name); |
a8b3b0b6 CR |
2168 | |
2169 | /* Make sure flags for symbol being C bound are clear initially. */ | |
2170 | p->attr.is_bind_c = 0; | |
2171 | p->attr.is_iso_c = 0; | |
2172 | /* Make sure the binding label field has a Nul char to start. */ | |
2173 | p->binding_label[0] = '\0'; | |
2174 | ||
2175 | /* Clear the ptrs we may need. */ | |
2176 | p->common_block = NULL; | |
2177 | ||
6de9cd9a DN |
2178 | return p; |
2179 | } | |
2180 | ||
2181 | ||
2182 | /* Generate an error if a symbol is ambiguous. */ | |
2183 | ||
2184 | static void | |
66e4ab31 | 2185 | ambiguous_symbol (const char *name, gfc_symtree *st) |
6de9cd9a DN |
2186 | { |
2187 | ||
cb9e4f55 | 2188 | if (st->n.sym->module) |
6de9cd9a DN |
2189 | gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' " |
2190 | "from module '%s'", name, st->n.sym->name, st->n.sym->module); | |
2191 | else | |
2192 | gfc_error ("Name '%s' at %C is an ambiguous reference to '%s' " | |
2193 | "from current program unit", name, st->n.sym->name); | |
2194 | } | |
2195 | ||
2196 | ||
294fbfc8 | 2197 | /* Search for a symtree starting in the current namespace, resorting to |
6de9cd9a | 2198 | any parent namespaces if requested by a nonzero parent_flag. |
294fbfc8 | 2199 | Returns nonzero if the name is ambiguous. */ |
6de9cd9a DN |
2200 | |
2201 | int | |
66e4ab31 SK |
2202 | gfc_find_sym_tree (const char *name, gfc_namespace *ns, int parent_flag, |
2203 | gfc_symtree **result) | |
6de9cd9a DN |
2204 | { |
2205 | gfc_symtree *st; | |
2206 | ||
2207 | if (ns == NULL) | |
2208 | ns = gfc_current_ns; | |
2209 | ||
2210 | do | |
2211 | { | |
2212 | st = gfc_find_symtree (ns->sym_root, name); | |
2213 | if (st != NULL) | |
2214 | { | |
2215 | *result = st; | |
993ef28f PT |
2216 | /* Ambiguous generic interfaces are permitted, as long |
2217 | as the specific interfaces are different. */ | |
2218 | if (st->ambiguous && !st->n.sym->attr.generic) | |
6de9cd9a DN |
2219 | { |
2220 | ambiguous_symbol (name, st); | |
2221 | return 1; | |
2222 | } | |
2223 | ||
2224 | return 0; | |
2225 | } | |
2226 | ||
2227 | if (!parent_flag) | |
2228 | break; | |
2229 | ||
2230 | ns = ns->parent; | |
2231 | } | |
2232 | while (ns != NULL); | |
2233 | ||
2234 | *result = NULL; | |
2235 | return 0; | |
2236 | } | |
2237 | ||
2238 | ||
294fbfc8 TS |
2239 | /* Same, but returns the symbol instead. */ |
2240 | ||
6de9cd9a | 2241 | int |
66e4ab31 SK |
2242 | gfc_find_symbol (const char *name, gfc_namespace *ns, int parent_flag, |
2243 | gfc_symbol **result) | |
6de9cd9a DN |
2244 | { |
2245 | gfc_symtree *st; | |
2246 | int i; | |
2247 | ||
2248 | i = gfc_find_sym_tree (name, ns, parent_flag, &st); | |
2249 | ||
2250 | if (st == NULL) | |
2251 | *result = NULL; | |
2252 | else | |
2253 | *result = st->n.sym; | |
2254 | ||
2255 | return i; | |
2256 | } | |
2257 | ||
2258 | ||
2259 | /* Save symbol with the information necessary to back it out. */ | |
2260 | ||
2261 | static void | |
66e4ab31 | 2262 | save_symbol_data (gfc_symbol *sym) |
6de9cd9a DN |
2263 | { |
2264 | ||
2265 | if (sym->new || sym->old_symbol != NULL) | |
2266 | return; | |
2267 | ||
2268 | sym->old_symbol = gfc_getmem (sizeof (gfc_symbol)); | |
2269 | *(sym->old_symbol) = *sym; | |
2270 | ||
2271 | sym->tlink = changed_syms; | |
2272 | changed_syms = sym; | |
2273 | } | |
2274 | ||
2275 | ||
2276 | /* Given a name, find a symbol, or create it if it does not exist yet | |
2277 | in the current namespace. If the symbol is found we make sure that | |
2278 | it's OK. | |
2279 | ||
2280 | The integer return code indicates | |
2281 | 0 All OK | |
2282 | 1 The symbol name was ambiguous | |
2283 | 2 The name meant to be established was already host associated. | |
2284 | ||
2285 | So if the return value is nonzero, then an error was issued. */ | |
2286 | ||
2287 | int | |
66e4ab31 | 2288 | gfc_get_sym_tree (const char *name, gfc_namespace *ns, gfc_symtree **result) |
6de9cd9a DN |
2289 | { |
2290 | gfc_symtree *st; | |
2291 | gfc_symbol *p; | |
2292 | ||
2293 | /* This doesn't usually happen during resolution. */ | |
2294 | if (ns == NULL) | |
2295 | ns = gfc_current_ns; | |
2296 | ||
2297 | /* Try to find the symbol in ns. */ | |
2298 | st = gfc_find_symtree (ns->sym_root, name); | |
2299 | ||
2300 | if (st == NULL) | |
2301 | { | |
2302 | /* If not there, create a new symbol. */ | |
2303 | p = gfc_new_symbol (name, ns); | |
2304 | ||
2305 | /* Add to the list of tentative symbols. */ | |
2306 | p->old_symbol = NULL; | |
2307 | p->tlink = changed_syms; | |
2308 | p->mark = 1; | |
2309 | p->new = 1; | |
2310 | changed_syms = p; | |
2311 | ||
2312 | st = gfc_new_symtree (&ns->sym_root, name); | |
2313 | st->n.sym = p; | |
2314 | p->refs++; | |
2315 | ||
2316 | } | |
2317 | else | |
2318 | { | |
993ef28f PT |
2319 | /* Make sure the existing symbol is OK. Ambiguous |
2320 | generic interfaces are permitted, as long as the | |
2321 | specific interfaces are different. */ | |
2322 | if (st->ambiguous && !st->n.sym->attr.generic) | |
6de9cd9a DN |
2323 | { |
2324 | ambiguous_symbol (name, st); | |
2325 | return 1; | |
2326 | } | |
2327 | ||
2328 | p = st->n.sym; | |
2329 | ||
2330 | if (p->ns != ns && (!p->attr.function || ns->proc_name != p)) | |
2331 | { | |
2332 | /* Symbol is from another namespace. */ | |
2333 | gfc_error ("Symbol '%s' at %C has already been host associated", | |
2334 | name); | |
2335 | return 2; | |
2336 | } | |
2337 | ||
2338 | p->mark = 1; | |
2339 | ||
2340 | /* Copy in case this symbol is changed. */ | |
2341 | save_symbol_data (p); | |
2342 | } | |
2343 | ||
2344 | *result = st; | |
2345 | return 0; | |
2346 | } | |
2347 | ||
2348 | ||
2349 | int | |
66e4ab31 | 2350 | gfc_get_symbol (const char *name, gfc_namespace *ns, gfc_symbol **result) |
6de9cd9a DN |
2351 | { |
2352 | gfc_symtree *st; | |
2353 | int i; | |
2354 | ||
6de9cd9a DN |
2355 | i = gfc_get_sym_tree (name, ns, &st); |
2356 | if (i != 0) | |
2357 | return i; | |
2358 | ||
2359 | if (st) | |
2360 | *result = st->n.sym; | |
2361 | else | |
2362 | *result = NULL; | |
2363 | return i; | |
2364 | } | |
2365 | ||
2366 | ||
2367 | /* Subroutine that searches for a symbol, creating it if it doesn't | |
2368 | exist, but tries to host-associate the symbol if possible. */ | |
2369 | ||
2370 | int | |
66e4ab31 | 2371 | gfc_get_ha_sym_tree (const char *name, gfc_symtree **result) |
6de9cd9a DN |
2372 | { |
2373 | gfc_symtree *st; | |
2374 | int i; | |
2375 | ||
2376 | i = gfc_find_sym_tree (name, gfc_current_ns, 0, &st); | |
2377 | if (st != NULL) | |
2378 | { | |
2379 | save_symbol_data (st->n.sym); | |
6de9cd9a DN |
2380 | *result = st; |
2381 | return i; | |
2382 | } | |
2383 | ||
2384 | if (gfc_current_ns->parent != NULL) | |
2385 | { | |
2386 | i = gfc_find_sym_tree (name, gfc_current_ns->parent, 1, &st); | |
2387 | if (i) | |
2388 | return i; | |
2389 | ||
2390 | if (st != NULL) | |
2391 | { | |
2392 | *result = st; | |
2393 | return 0; | |
2394 | } | |
2395 | } | |
2396 | ||
2397 | return gfc_get_sym_tree (name, gfc_current_ns, result); | |
2398 | } | |
2399 | ||
2400 | ||
2401 | int | |
66e4ab31 | 2402 | gfc_get_ha_symbol (const char *name, gfc_symbol **result) |
6de9cd9a DN |
2403 | { |
2404 | int i; | |
2405 | gfc_symtree *st; | |
2406 | ||
2407 | i = gfc_get_ha_sym_tree (name, &st); | |
2408 | ||
2409 | if (st) | |
2410 | *result = st->n.sym; | |
2411 | else | |
2412 | *result = NULL; | |
2413 | ||
2414 | return i; | |
2415 | } | |
2416 | ||
2417 | /* Return true if both symbols could refer to the same data object. Does | |
2418 | not take account of aliasing due to equivalence statements. */ | |
2419 | ||
2420 | int | |
66e4ab31 | 2421 | gfc_symbols_could_alias (gfc_symbol *lsym, gfc_symbol *rsym) |
6de9cd9a DN |
2422 | { |
2423 | /* Aliasing isn't possible if the symbols have different base types. */ | |
2424 | if (gfc_compare_types (&lsym->ts, &rsym->ts) == 0) | |
2425 | return 0; | |
2426 | ||
2427 | /* Pointers can point to other pointers, target objects and allocatable | |
2428 | objects. Two allocatable objects cannot share the same storage. */ | |
2429 | if (lsym->attr.pointer | |
2430 | && (rsym->attr.pointer || rsym->attr.allocatable || rsym->attr.target)) | |
2431 | return 1; | |
2432 | if (lsym->attr.target && rsym->attr.pointer) | |
2433 | return 1; | |
2434 | if (lsym->attr.allocatable && rsym->attr.pointer) | |
2435 | return 1; | |
2436 | ||
2437 | return 0; | |
2438 | } | |
2439 | ||
2440 | ||
2441 | /* Undoes all the changes made to symbols in the current statement. | |
2442 | This subroutine is made simpler due to the fact that attributes are | |
2443 | never removed once added. */ | |
2444 | ||
2445 | void | |
2446 | gfc_undo_symbols (void) | |
2447 | { | |
2448 | gfc_symbol *p, *q, *old; | |
2449 | ||
2450 | for (p = changed_syms; p; p = q) | |
2451 | { | |
2452 | q = p->tlink; | |
2453 | ||
2454 | if (p->new) | |
2455 | { | |
2456 | /* Symbol was new. */ | |
2457 | delete_symtree (&p->ns->sym_root, p->name); | |
2458 | ||
2459 | p->refs--; | |
2460 | if (p->refs < 0) | |
2461 | gfc_internal_error ("gfc_undo_symbols(): Negative refs"); | |
2462 | if (p->refs == 0) | |
2463 | gfc_free_symbol (p); | |
2464 | continue; | |
2465 | } | |
2466 | ||
2467 | /* Restore previous state of symbol. Just copy simple stuff. */ | |
2468 | p->mark = 0; | |
2469 | old = p->old_symbol; | |
2470 | ||
2471 | p->ts.type = old->ts.type; | |
2472 | p->ts.kind = old->ts.kind; | |
2473 | ||
2474 | p->attr = old->attr; | |
2475 | ||
2476 | if (p->value != old->value) | |
2477 | { | |
2478 | gfc_free_expr (old->value); | |
2479 | p->value = NULL; | |
2480 | } | |
2481 | ||
2482 | if (p->as != old->as) | |
2483 | { | |
2484 | if (p->as) | |
2485 | gfc_free_array_spec (p->as); | |
2486 | p->as = old->as; | |
2487 | } | |
2488 | ||
2489 | p->generic = old->generic; | |
2490 | p->component_access = old->component_access; | |
2491 | ||
2492 | if (p->namelist != NULL && old->namelist == NULL) | |
2493 | { | |
2494 | gfc_free_namelist (p->namelist); | |
2495 | p->namelist = NULL; | |
2496 | } | |
2497 | else | |
2498 | { | |
6de9cd9a DN |
2499 | if (p->namelist_tail != old->namelist_tail) |
2500 | { | |
2501 | gfc_free_namelist (old->namelist_tail); | |
2502 | old->namelist_tail->next = NULL; | |
2503 | } | |
2504 | } | |
2505 | ||
2506 | p->namelist_tail = old->namelist_tail; | |
2507 | ||
2508 | if (p->formal != old->formal) | |
2509 | { | |
2510 | gfc_free_formal_arglist (p->formal); | |
2511 | p->formal = old->formal; | |
2512 | } | |
2513 | ||
2514 | gfc_free (p->old_symbol); | |
2515 | p->old_symbol = NULL; | |
2516 | p->tlink = NULL; | |
2517 | } | |
2518 | ||
2519 | changed_syms = NULL; | |
2520 | } | |
2521 | ||
2522 | ||
091c9413 EE |
2523 | /* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the |
2524 | components of old_symbol that might need deallocation are the "allocatables" | |
2525 | that are restored in gfc_undo_symbols(), with two exceptions: namelist and | |
2526 | namelist_tail. In case these differ between old_symbol and sym, it's just | |
2527 | because sym->namelist has gotten a few more items. */ | |
810306f2 EE |
2528 | |
2529 | static void | |
66e4ab31 | 2530 | free_old_symbol (gfc_symbol *sym) |
810306f2 | 2531 | { |
66e4ab31 | 2532 | |
810306f2 EE |
2533 | if (sym->old_symbol == NULL) |
2534 | return; | |
2535 | ||
2536 | if (sym->old_symbol->as != sym->as) | |
2537 | gfc_free_array_spec (sym->old_symbol->as); | |
2538 | ||
2539 | if (sym->old_symbol->value != sym->value) | |
2540 | gfc_free_expr (sym->old_symbol->value); | |
2541 | ||
091c9413 EE |
2542 | if (sym->old_symbol->formal != sym->formal) |
2543 | gfc_free_formal_arglist (sym->old_symbol->formal); | |
2544 | ||
810306f2 EE |
2545 | gfc_free (sym->old_symbol); |
2546 | sym->old_symbol = NULL; | |
2547 | } | |
2548 | ||
2549 | ||
6de9cd9a DN |
2550 | /* Makes the changes made in the current statement permanent-- gets |
2551 | rid of undo information. */ | |
2552 | ||
2553 | void | |
2554 | gfc_commit_symbols (void) | |
2555 | { | |
2556 | gfc_symbol *p, *q; | |
2557 | ||
2558 | for (p = changed_syms; p; p = q) | |
2559 | { | |
2560 | q = p->tlink; | |
2561 | p->tlink = NULL; | |
2562 | p->mark = 0; | |
2563 | p->new = 0; | |
810306f2 | 2564 | free_old_symbol (p); |
6de9cd9a | 2565 | } |
6de9cd9a DN |
2566 | changed_syms = NULL; |
2567 | } | |
2568 | ||
2569 | ||
810306f2 EE |
2570 | /* Makes the changes made in one symbol permanent -- gets rid of undo |
2571 | information. */ | |
2572 | ||
2573 | void | |
66e4ab31 | 2574 | gfc_commit_symbol (gfc_symbol *sym) |
810306f2 EE |
2575 | { |
2576 | gfc_symbol *p; | |
2577 | ||
2578 | if (changed_syms == sym) | |
2579 | changed_syms = sym->tlink; | |
2580 | else | |
2581 | { | |
2582 | for (p = changed_syms; p; p = p->tlink) | |
2583 | if (p->tlink == sym) | |
2584 | { | |
2585 | p->tlink = sym->tlink; | |
2586 | break; | |
2587 | } | |
2588 | } | |
2589 | ||
2590 | sym->tlink = NULL; | |
2591 | sym->mark = 0; | |
2592 | sym->new = 0; | |
2593 | ||
2594 | free_old_symbol (sym); | |
2595 | } | |
2596 | ||
2597 | ||
53814b8f TS |
2598 | /* Recursive function that deletes an entire tree and all the common |
2599 | head structures it points to. */ | |
2600 | ||
2601 | static void | |
2602 | free_common_tree (gfc_symtree * common_tree) | |
2603 | { | |
2604 | if (common_tree == NULL) | |
2605 | return; | |
2606 | ||
2607 | free_common_tree (common_tree->left); | |
2608 | free_common_tree (common_tree->right); | |
2609 | ||
2610 | gfc_free (common_tree); | |
2611 | } | |
2612 | ||
2613 | ||
6de9cd9a DN |
2614 | /* Recursive function that deletes an entire tree and all the user |
2615 | operator nodes that it contains. */ | |
2616 | ||
2617 | static void | |
66e4ab31 | 2618 | free_uop_tree (gfc_symtree *uop_tree) |
6de9cd9a DN |
2619 | { |
2620 | ||
2621 | if (uop_tree == NULL) | |
2622 | return; | |
2623 | ||
2624 | free_uop_tree (uop_tree->left); | |
2625 | free_uop_tree (uop_tree->right); | |
2626 | ||
2627 | gfc_free_interface (uop_tree->n.uop->operator); | |
2628 | ||
2629 | gfc_free (uop_tree->n.uop); | |
2630 | gfc_free (uop_tree); | |
2631 | } | |
2632 | ||
2633 | ||
2634 | /* Recursive function that deletes an entire tree and all the symbols | |
2635 | that it contains. */ | |
2636 | ||
2637 | static void | |
66e4ab31 | 2638 | free_sym_tree (gfc_symtree *sym_tree) |
6de9cd9a DN |
2639 | { |
2640 | gfc_namespace *ns; | |
2641 | gfc_symbol *sym; | |
2642 | ||
2643 | if (sym_tree == NULL) | |
2644 | return; | |
2645 | ||
2646 | free_sym_tree (sym_tree->left); | |
2647 | free_sym_tree (sym_tree->right); | |
2648 | ||
2649 | sym = sym_tree->n.sym; | |
2650 | ||
2651 | sym->refs--; | |
2652 | if (sym->refs < 0) | |
2653 | gfc_internal_error ("free_sym_tree(): Negative refs"); | |
2654 | ||
2655 | if (sym->formal_ns != NULL && sym->refs == 1) | |
2656 | { | |
2657 | /* As formal_ns contains a reference to sym, delete formal_ns just | |
2658 | before the deletion of sym. */ | |
2659 | ns = sym->formal_ns; | |
2660 | sym->formal_ns = NULL; | |
2661 | gfc_free_namespace (ns); | |
2662 | } | |
2663 | else if (sym->refs == 0) | |
2664 | { | |
2665 | /* Go ahead and delete the symbol. */ | |
2666 | gfc_free_symbol (sym); | |
2667 | } | |
2668 | ||
2669 | gfc_free (sym_tree); | |
2670 | } | |
2671 | ||
2672 | ||
7453378e | 2673 | /* Free the derived type list. */ |
6b887797 PT |
2674 | |
2675 | static void | |
7453378e | 2676 | gfc_free_dt_list (void) |
6b887797 | 2677 | { |
7453378e | 2678 | gfc_dt_list *dt, *n; |
6b887797 | 2679 | |
7453378e | 2680 | for (dt = gfc_derived_types; dt; dt = n) |
6b887797 PT |
2681 | { |
2682 | n = dt->next; | |
2683 | gfc_free (dt); | |
2684 | } | |
7453378e PT |
2685 | |
2686 | gfc_derived_types = NULL; | |
6b887797 PT |
2687 | } |
2688 | ||
2689 | ||
61321991 PT |
2690 | /* Free the gfc_equiv_info's. */ |
2691 | ||
2692 | static void | |
66e4ab31 | 2693 | gfc_free_equiv_infos (gfc_equiv_info *s) |
61321991 PT |
2694 | { |
2695 | if (s == NULL) | |
2696 | return; | |
2697 | gfc_free_equiv_infos (s->next); | |
2698 | gfc_free (s); | |
2699 | } | |
2700 | ||
2701 | ||
2702 | /* Free the gfc_equiv_lists. */ | |
2703 | ||
2704 | static void | |
66e4ab31 | 2705 | gfc_free_equiv_lists (gfc_equiv_list *l) |
61321991 PT |
2706 | { |
2707 | if (l == NULL) | |
2708 | return; | |
2709 | gfc_free_equiv_lists (l->next); | |
2710 | gfc_free_equiv_infos (l->equiv); | |
2711 | gfc_free (l); | |
2712 | } | |
2713 | ||
2714 | ||
6de9cd9a DN |
2715 | /* Free a namespace structure and everything below it. Interface |
2716 | lists associated with intrinsic operators are not freed. These are | |
2717 | taken care of when a specific name is freed. */ | |
2718 | ||
2719 | void | |
66e4ab31 | 2720 | gfc_free_namespace (gfc_namespace *ns) |
6de9cd9a DN |
2721 | { |
2722 | gfc_charlen *cl, *cl2; | |
2723 | gfc_namespace *p, *q; | |
2724 | gfc_intrinsic_op i; | |
2725 | ||
2726 | if (ns == NULL) | |
2727 | return; | |
2728 | ||
3d79abbd PB |
2729 | ns->refs--; |
2730 | if (ns->refs > 0) | |
2731 | return; | |
6e45f57b | 2732 | gcc_assert (ns->refs == 0); |
3d79abbd | 2733 | |
6de9cd9a DN |
2734 | gfc_free_statements (ns->code); |
2735 | ||
2736 | free_sym_tree (ns->sym_root); | |
2737 | free_uop_tree (ns->uop_root); | |
53814b8f | 2738 | free_common_tree (ns->common_root); |
6de9cd9a DN |
2739 | |
2740 | for (cl = ns->cl_list; cl; cl = cl2) | |
2741 | { | |
2742 | cl2 = cl->next; | |
2743 | gfc_free_expr (cl->length); | |
2744 | gfc_free (cl); | |
2745 | } | |
2746 | ||
2747 | free_st_labels (ns->st_labels); | |
2748 | ||
2749 | gfc_free_equiv (ns->equiv); | |
61321991 | 2750 | gfc_free_equiv_lists (ns->equiv_lists); |
6de9cd9a DN |
2751 | |
2752 | for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++) | |
2753 | gfc_free_interface (ns->operator[i]); | |
2754 | ||
2755 | gfc_free_data (ns->data); | |
2756 | p = ns->contained; | |
2757 | gfc_free (ns); | |
2758 | ||
2759 | /* Recursively free any contained namespaces. */ | |
2760 | while (p != NULL) | |
2761 | { | |
2762 | q = p; | |
2763 | p = p->sibling; | |
6de9cd9a DN |
2764 | gfc_free_namespace (q); |
2765 | } | |
2766 | } | |
2767 | ||
2768 | ||
2769 | void | |
2770 | gfc_symbol_init_2 (void) | |
2771 | { | |
2772 | ||
0366dfe9 | 2773 | gfc_current_ns = gfc_get_namespace (NULL, 0); |
6de9cd9a DN |
2774 | } |
2775 | ||
2776 | ||
2777 | void | |
2778 | gfc_symbol_done_2 (void) | |
2779 | { | |
2780 | ||
2781 | gfc_free_namespace (gfc_current_ns); | |
2782 | gfc_current_ns = NULL; | |
7453378e | 2783 | gfc_free_dt_list (); |
6de9cd9a DN |
2784 | } |
2785 | ||
2786 | ||
2787 | /* Clear mark bits from symbol nodes associated with a symtree node. */ | |
2788 | ||
2789 | static void | |
66e4ab31 | 2790 | clear_sym_mark (gfc_symtree *st) |
6de9cd9a DN |
2791 | { |
2792 | ||
2793 | st->n.sym->mark = 0; | |
2794 | } | |
2795 | ||
2796 | ||
2797 | /* Recursively traverse the symtree nodes. */ | |
2798 | ||
9056bd70 | 2799 | void |
66e4ab31 | 2800 | gfc_traverse_symtree (gfc_symtree *st, void (*func) (gfc_symtree *)) |
6de9cd9a | 2801 | { |
6de9cd9a DN |
2802 | if (st != NULL) |
2803 | { | |
2804 | (*func) (st); | |
2805 | ||
9056bd70 TS |
2806 | gfc_traverse_symtree (st->left, func); |
2807 | gfc_traverse_symtree (st->right, func); | |
6de9cd9a DN |
2808 | } |
2809 | } | |
2810 | ||
2811 | ||
6de9cd9a DN |
2812 | /* Recursive namespace traversal function. */ |
2813 | ||
2814 | static void | |
66e4ab31 | 2815 | traverse_ns (gfc_symtree *st, void (*func) (gfc_symbol *)) |
6de9cd9a DN |
2816 | { |
2817 | ||
2818 | if (st == NULL) | |
2819 | return; | |
2820 | ||
2821 | if (st->n.sym->mark == 0) | |
2822 | (*func) (st->n.sym); | |
2823 | st->n.sym->mark = 1; | |
2824 | ||
2825 | traverse_ns (st->left, func); | |
2826 | traverse_ns (st->right, func); | |
2827 | } | |
2828 | ||
2829 | ||
2830 | /* Call a given function for all symbols in the namespace. We take | |
2831 | care that each gfc_symbol node is called exactly once. */ | |
2832 | ||
2833 | void | |
66e4ab31 | 2834 | gfc_traverse_ns (gfc_namespace *ns, void (*func) (gfc_symbol *)) |
6de9cd9a DN |
2835 | { |
2836 | ||
9056bd70 | 2837 | gfc_traverse_symtree (ns->sym_root, clear_sym_mark); |
6de9cd9a DN |
2838 | |
2839 | traverse_ns (ns->sym_root, func); | |
2840 | } | |
2841 | ||
2842 | ||
bd83e614 | 2843 | /* Return TRUE if the symbol is an automatic variable. */ |
66e4ab31 | 2844 | |
bd83e614 | 2845 | static bool |
66e4ab31 | 2846 | gfc_is_var_automatic (gfc_symbol *sym) |
bd83e614 PB |
2847 | { |
2848 | /* Pointer and allocatable variables are never automatic. */ | |
2849 | if (sym->attr.pointer || sym->attr.allocatable) | |
2850 | return false; | |
2851 | /* Check for arrays with non-constant size. */ | |
2852 | if (sym->attr.dimension && sym->as | |
2853 | && !gfc_is_compile_time_shape (sym->as)) | |
2854 | return true; | |
5189dd41 | 2855 | /* Check for non-constant length character variables. */ |
bd83e614 PB |
2856 | if (sym->ts.type == BT_CHARACTER |
2857 | && sym->ts.cl | |
d05d9ac7 | 2858 | && !gfc_is_constant_expr (sym->ts.cl->length)) |
bd83e614 PB |
2859 | return true; |
2860 | return false; | |
2861 | } | |
2862 | ||
6de9cd9a DN |
2863 | /* Given a symbol, mark it as SAVEd if it is allowed. */ |
2864 | ||
2865 | static void | |
66e4ab31 | 2866 | save_symbol (gfc_symbol *sym) |
6de9cd9a DN |
2867 | { |
2868 | ||
2869 | if (sym->attr.use_assoc) | |
2870 | return; | |
2871 | ||
6de9cd9a DN |
2872 | if (sym->attr.in_common |
2873 | || sym->attr.dummy | |
2874 | || sym->attr.flavor != FL_VARIABLE) | |
2875 | return; | |
bd83e614 PB |
2876 | /* Automatic objects are not saved. */ |
2877 | if (gfc_is_var_automatic (sym)) | |
2878 | return; | |
231b2fcc | 2879 | gfc_add_save (&sym->attr, sym->name, &sym->declared_at); |
6de9cd9a DN |
2880 | } |
2881 | ||
2882 | ||
2883 | /* Mark those symbols which can be SAVEd as such. */ | |
2884 | ||
2885 | void | |
66e4ab31 | 2886 | gfc_save_all (gfc_namespace *ns) |
6de9cd9a DN |
2887 | { |
2888 | ||
2889 | gfc_traverse_ns (ns, save_symbol); | |
2890 | } | |
2891 | ||
2892 | ||
2893 | #ifdef GFC_DEBUG | |
2894 | /* Make sure that no changes to symbols are pending. */ | |
2895 | ||
2896 | void | |
2897 | gfc_symbol_state(void) { | |
2898 | ||
2899 | if (changed_syms != NULL) | |
2900 | gfc_internal_error("Symbol changes still pending!"); | |
2901 | } | |
2902 | #endif | |
2903 | ||
c9543002 TS |
2904 | |
2905 | /************** Global symbol handling ************/ | |
2906 | ||
2907 | ||
2908 | /* Search a tree for the global symbol. */ | |
2909 | ||
2910 | gfc_gsymbol * | |
cb9e4f55 | 2911 | gfc_find_gsymbol (gfc_gsymbol *symbol, const char *name) |
c9543002 | 2912 | { |
1a549788 | 2913 | int c; |
c9543002 TS |
2914 | |
2915 | if (symbol == NULL) | |
2916 | return NULL; | |
c9543002 | 2917 | |
1a549788 TS |
2918 | while (symbol) |
2919 | { | |
2920 | c = strcmp (name, symbol->name); | |
2921 | if (!c) | |
2922 | return symbol; | |
c9543002 | 2923 | |
1a549788 TS |
2924 | symbol = (c < 0) ? symbol->left : symbol->right; |
2925 | } | |
c9543002 TS |
2926 | |
2927 | return NULL; | |
2928 | } | |
2929 | ||
2930 | ||
2931 | /* Compare two global symbols. Used for managing the BB tree. */ | |
2932 | ||
2933 | static int | |
66e4ab31 | 2934 | gsym_compare (void *_s1, void *_s2) |
c9543002 TS |
2935 | { |
2936 | gfc_gsymbol *s1, *s2; | |
2937 | ||
66e4ab31 SK |
2938 | s1 = (gfc_gsymbol *) _s1; |
2939 | s2 = (gfc_gsymbol *) _s2; | |
2940 | return strcmp (s1->name, s2->name); | |
c9543002 TS |
2941 | } |
2942 | ||
2943 | ||
2944 | /* Get a global symbol, creating it if it doesn't exist. */ | |
2945 | ||
2946 | gfc_gsymbol * | |
cb9e4f55 | 2947 | gfc_get_gsymbol (const char *name) |
c9543002 TS |
2948 | { |
2949 | gfc_gsymbol *s; | |
2950 | ||
2951 | s = gfc_find_gsymbol (gfc_gsym_root, name); | |
2952 | if (s != NULL) | |
2953 | return s; | |
2954 | ||
2955 | s = gfc_getmem (sizeof (gfc_gsymbol)); | |
2956 | s->type = GSYM_UNKNOWN; | |
973a384d | 2957 | s->name = gfc_get_string (name); |
c9543002 TS |
2958 | |
2959 | gfc_insert_bbt (&gfc_gsym_root, s, gsym_compare); | |
2960 | ||
2961 | return s; | |
2962 | } | |
a8b3b0b6 CR |
2963 | |
2964 | ||
2965 | static gfc_symbol * | |
2966 | get_iso_c_binding_dt (int sym_id) | |
2967 | { | |
2968 | gfc_dt_list *dt_list; | |
2969 | ||
2970 | dt_list = gfc_derived_types; | |
2971 | ||
2972 | /* Loop through the derived types in the name list, searching for | |
2973 | the desired symbol from iso_c_binding. Search the parent namespaces | |
2974 | if necessary and requested to (parent_flag). */ | |
2975 | while (dt_list != NULL) | |
2976 | { | |
2977 | if (dt_list->derived->from_intmod != INTMOD_NONE | |
2978 | && dt_list->derived->intmod_sym_id == sym_id) | |
2979 | return dt_list->derived; | |
2980 | ||
2981 | dt_list = dt_list->next; | |
2982 | } | |
2983 | ||
2984 | return NULL; | |
2985 | } | |
2986 | ||
2987 | ||
2988 | /* Verifies that the given derived type symbol, derived_sym, is interoperable | |
2989 | with C. This is necessary for any derived type that is BIND(C) and for | |
2990 | derived types that are parameters to functions that are BIND(C). All | |
2991 | fields of the derived type are required to be interoperable, and are tested | |
2992 | for such. If an error occurs, the errors are reported here, allowing for | |
2993 | multiple errors to be handled for a single derived type. */ | |
2994 | ||
2995 | try | |
2996 | verify_bind_c_derived_type (gfc_symbol *derived_sym) | |
2997 | { | |
2998 | gfc_component *curr_comp = NULL; | |
2999 | try is_c_interop = FAILURE; | |
3000 | try retval = SUCCESS; | |
3001 | ||
3002 | if (derived_sym == NULL) | |
3003 | gfc_internal_error ("verify_bind_c_derived_type(): Given symbol is " | |
3004 | "unexpectedly NULL"); | |
3005 | ||
3006 | /* If we've already looked at this derived symbol, do not look at it again | |
3007 | so we don't repeat warnings/errors. */ | |
3008 | if (derived_sym->ts.is_c_interop) | |
3009 | return SUCCESS; | |
3010 | ||
3011 | /* The derived type must have the BIND attribute to be interoperable | |
3012 | J3/04-007, Section 15.2.3. */ | |
3013 | if (derived_sym->attr.is_bind_c != 1) | |
3014 | { | |
3015 | derived_sym->ts.is_c_interop = 0; | |
3016 | gfc_error_now ("Derived type '%s' declared at %L must have the BIND " | |
3017 | "attribute to be C interoperable", derived_sym->name, | |
3018 | &(derived_sym->declared_at)); | |
3019 | retval = FAILURE; | |
3020 | } | |
3021 | ||
3022 | curr_comp = derived_sym->components; | |
3023 | ||
3024 | /* TODO: is this really an error? */ | |
3025 | if (curr_comp == NULL) | |
3026 | { | |
3027 | gfc_error ("Derived type '%s' at %L is empty", | |
3028 | derived_sym->name, &(derived_sym->declared_at)); | |
3029 | return FAILURE; | |
3030 | } | |
3031 | ||
3032 | /* Initialize the derived type as being C interoperable. | |
3033 | If we find an error in the components, this will be set false. */ | |
3034 | derived_sym->ts.is_c_interop = 1; | |
3035 | ||
3036 | /* Loop through the list of components to verify that the kind of | |
3037 | each is a C interoperable type. */ | |
3038 | do | |
3039 | { | |
3040 | /* The components cannot be pointers (fortran sense). | |
3041 | J3/04-007, Section 15.2.3, C1505. */ | |
3042 | if (curr_comp->pointer != 0) | |
3043 | { | |
3044 | gfc_error ("Component '%s' at %L cannot have the " | |
3045 | "POINTER attribute because it is a member " | |
3046 | "of the BIND(C) derived type '%s' at %L", | |
3047 | curr_comp->name, &(curr_comp->loc), | |
3048 | derived_sym->name, &(derived_sym->declared_at)); | |
3049 | retval = FAILURE; | |
3050 | } | |
3051 | ||
3052 | /* The components cannot be allocatable. | |
3053 | J3/04-007, Section 15.2.3, C1505. */ | |
3054 | if (curr_comp->allocatable != 0) | |
3055 | { | |
3056 | gfc_error ("Component '%s' at %L cannot have the " | |
3057 | "ALLOCATABLE attribute because it is a member " | |
3058 | "of the BIND(C) derived type '%s' at %L", | |
3059 | curr_comp->name, &(curr_comp->loc), | |
3060 | derived_sym->name, &(derived_sym->declared_at)); | |
3061 | retval = FAILURE; | |
3062 | } | |
3063 | ||
3064 | /* BIND(C) derived types must have interoperable components. */ | |
3065 | if (curr_comp->ts.type == BT_DERIVED | |
3066 | && curr_comp->ts.derived->ts.is_iso_c != 1 | |
3067 | && curr_comp->ts.derived != derived_sym) | |
3068 | { | |
3069 | /* This should be allowed; the draft says a derived-type can not | |
3070 | have type parameters if it is has the BIND attribute. Type | |
3071 | parameters seem to be for making parameterized derived types. | |
3072 | There's no need to verify the type if it is c_ptr/c_funptr. */ | |
3073 | retval = verify_bind_c_derived_type (curr_comp->ts.derived); | |
3074 | } | |
3075 | else | |
3076 | { | |
3077 | /* Grab the typespec for the given component and test the kind. */ | |
3078 | is_c_interop = verify_c_interop (&(curr_comp->ts), curr_comp->name, | |
3079 | &(curr_comp->loc)); | |
3080 | ||
3081 | if (is_c_interop != SUCCESS) | |
3082 | { | |
3083 | /* Report warning and continue since not fatal. The | |
3084 | draft does specify a constraint that requires all fields | |
3085 | to interoperate, but if the user says real(4), etc., it | |
3086 | may interoperate with *something* in C, but the compiler | |
3087 | most likely won't know exactly what. Further, it may not | |
3088 | interoperate with the same data type(s) in C if the user | |
3089 | recompiles with different flags (e.g., -m32 and -m64 on | |
3090 | x86_64 and using integer(4) to claim interop with a | |
3091 | C_LONG). */ | |
3092 | if (derived_sym->attr.is_bind_c == 1) | |
3093 | /* If the derived type is bind(c), all fields must be | |
3094 | interop. */ | |
3095 | gfc_warning ("Component '%s' in derived type '%s' at %L " | |
3096 | "may not be C interoperable, even though " | |
3097 | "derived type '%s' is BIND(C)", | |
3098 | curr_comp->name, derived_sym->name, | |
3099 | &(curr_comp->loc), derived_sym->name); | |
3100 | else | |
3101 | /* If derived type is param to bind(c) routine, or to one | |
3102 | of the iso_c_binding procs, it must be interoperable, so | |
3103 | all fields must interop too. */ | |
3104 | gfc_warning ("Component '%s' in derived type '%s' at %L " | |
3105 | "may not be C interoperable", | |
3106 | curr_comp->name, derived_sym->name, | |
3107 | &(curr_comp->loc)); | |
3108 | } | |
3109 | } | |
3110 | ||
3111 | curr_comp = curr_comp->next; | |
3112 | } while (curr_comp != NULL); | |
3113 | ||
3114 | ||
3115 | /* Make sure we don't have conflicts with the attributes. */ | |
3116 | if (derived_sym->attr.access == ACCESS_PRIVATE) | |
3117 | { | |
3118 | gfc_error ("Derived type '%s' at %L cannot be declared with both " | |
3119 | "PRIVATE and BIND(C) attributes", derived_sym->name, | |
3120 | &(derived_sym->declared_at)); | |
3121 | retval = FAILURE; | |
3122 | } | |
3123 | ||
3124 | if (derived_sym->attr.sequence != 0) | |
3125 | { | |
3126 | gfc_error ("Derived type '%s' at %L cannot have the SEQUENCE " | |
3127 | "attribute because it is BIND(C)", derived_sym->name, | |
3128 | &(derived_sym->declared_at)); | |
3129 | retval = FAILURE; | |
3130 | } | |
3131 | ||
3132 | /* Mark the derived type as not being C interoperable if we found an | |
3133 | error. If there were only warnings, proceed with the assumption | |
3134 | it's interoperable. */ | |
3135 | if (retval == FAILURE) | |
3136 | derived_sym->ts.is_c_interop = 0; | |
3137 | ||
3138 | return retval; | |
3139 | } | |
3140 | ||
3141 | ||
3142 | /* Generate symbols for the named constants c_null_ptr and c_null_funptr. */ | |
3143 | ||
3144 | static try | |
3145 | gen_special_c_interop_ptr (int ptr_id, const char *ptr_name, | |
3146 | const char *module_name) | |
3147 | { | |
3148 | gfc_symtree *tmp_symtree; | |
3149 | gfc_symbol *tmp_sym; | |
3150 | ||
3151 | tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, ptr_name); | |
3152 | ||
3153 | if (tmp_symtree != NULL) | |
3154 | tmp_sym = tmp_symtree->n.sym; | |
3155 | else | |
3156 | { | |
3157 | tmp_sym = NULL; | |
3158 | gfc_internal_error ("gen_special_c_interop_ptr(): Unable to " | |
3159 | "create symbol for %s", ptr_name); | |
3160 | } | |
3161 | ||
3162 | /* Set up the symbol's important fields. Save attr required so we can | |
3163 | initialize the ptr to NULL. */ | |
3164 | tmp_sym->attr.save = 1; | |
3165 | tmp_sym->ts.is_c_interop = 1; | |
3166 | tmp_sym->attr.is_c_interop = 1; | |
3167 | tmp_sym->ts.is_iso_c = 1; | |
3168 | tmp_sym->ts.type = BT_DERIVED; | |
3169 | ||
3170 | /* The c_ptr and c_funptr derived types will provide the | |
3171 | definition for c_null_ptr and c_null_funptr, respectively. */ | |
3172 | if (ptr_id == ISOCBINDING_NULL_PTR) | |
3173 | tmp_sym->ts.derived = get_iso_c_binding_dt (ISOCBINDING_PTR); | |
3174 | else | |
3175 | tmp_sym->ts.derived = get_iso_c_binding_dt (ISOCBINDING_FUNPTR); | |
3176 | if (tmp_sym->ts.derived == NULL) | |
3177 | { | |
3178 | /* This can occur if the user forgot to declare c_ptr or | |
3179 | c_funptr and they're trying to use one of the procedures | |
3180 | that has arg(s) of the missing type. In this case, a | |
3181 | regular version of the thing should have been put in the | |
3182 | current ns. */ | |
3183 | generate_isocbinding_symbol (module_name, ptr_id == ISOCBINDING_NULL_PTR | |
3184 | ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR, | |
3185 | (char *) (ptr_id == ISOCBINDING_NULL_PTR | |
3186 | ? "_gfortran_iso_c_binding_c_ptr" | |
3187 | : "_gfortran_iso_c_binding_c_funptr")); | |
3188 | ||
3189 | tmp_sym->ts.derived = | |
3190 | get_iso_c_binding_dt (ptr_id == ISOCBINDING_NULL_PTR | |
3191 | ? ISOCBINDING_PTR : ISOCBINDING_FUNPTR); | |
3192 | } | |
3193 | ||
3194 | /* Module name is some mangled version of iso_c_binding. */ | |
3195 | tmp_sym->module = gfc_get_string (module_name); | |
3196 | ||
3197 | /* Say it's from the iso_c_binding module. */ | |
3198 | tmp_sym->attr.is_iso_c = 1; | |
3199 | ||
3200 | tmp_sym->attr.use_assoc = 1; | |
3201 | tmp_sym->attr.is_bind_c = 1; | |
3202 | /* Set the binding_label. */ | |
3203 | sprintf (tmp_sym->binding_label, "%s_%s", module_name, tmp_sym->name); | |
3204 | ||
3205 | /* Set the c_address field of c_null_ptr and c_null_funptr to | |
3206 | the value of NULL. */ | |
3207 | tmp_sym->value = gfc_get_expr (); | |
3208 | tmp_sym->value->expr_type = EXPR_STRUCTURE; | |
3209 | tmp_sym->value->ts.type = BT_DERIVED; | |
3210 | tmp_sym->value->ts.derived = tmp_sym->ts.derived; | |
3211 | tmp_sym->value->value.constructor = gfc_get_constructor (); | |
3212 | /* This line will initialize the c_null_ptr/c_null_funptr | |
3213 | c_address field to NULL. */ | |
3214 | tmp_sym->value->value.constructor->expr = gfc_int_expr (0); | |
3215 | /* Must declare c_null_ptr and c_null_funptr as having the | |
3216 | PARAMETER attribute so they can be used in init expressions. */ | |
3217 | tmp_sym->attr.flavor = FL_PARAMETER; | |
3218 | ||
3219 | return SUCCESS; | |
3220 | } | |
3221 | ||
3222 | ||
3223 | /* Add a formal argument, gfc_formal_arglist, to the | |
3224 | end of the given list of arguments. Set the reference to the | |
3225 | provided symbol, param_sym, in the argument. */ | |
3226 | ||
3227 | static void | |
3228 | add_formal_arg (gfc_formal_arglist **head, | |
3229 | gfc_formal_arglist **tail, | |
3230 | gfc_formal_arglist *formal_arg, | |
3231 | gfc_symbol *param_sym) | |
3232 | { | |
3233 | /* Put in list, either as first arg or at the tail (curr arg). */ | |
3234 | if (*head == NULL) | |
3235 | *head = *tail = formal_arg; | |
3236 | else | |
3237 | { | |
3238 | (*tail)->next = formal_arg; | |
3239 | (*tail) = formal_arg; | |
3240 | } | |
3241 | ||
3242 | (*tail)->sym = param_sym; | |
3243 | (*tail)->next = NULL; | |
3244 | ||
3245 | return; | |
3246 | } | |
3247 | ||
3248 | ||
3249 | /* Generates a symbol representing the CPTR argument to an | |
3250 | iso_c_binding procedure. Also, create a gfc_formal_arglist for the | |
3251 | CPTR and add it to the provided argument list. */ | |
3252 | ||
3253 | static void | |
3254 | gen_cptr_param (gfc_formal_arglist **head, | |
3255 | gfc_formal_arglist **tail, | |
3256 | const char *module_name, | |
3257 | gfc_namespace *ns, const char *c_ptr_name) | |
3258 | { | |
3259 | gfc_symbol *param_sym = NULL; | |
3260 | gfc_symbol *c_ptr_sym = NULL; | |
3261 | gfc_symtree *param_symtree = NULL; | |
3262 | gfc_formal_arglist *formal_arg = NULL; | |
3263 | const char *c_ptr_in; | |
3264 | const char *c_ptr_type = "c_ptr"; | |
3265 | ||
3266 | if(c_ptr_name == NULL) | |
3267 | c_ptr_in = "gfc_cptr__"; | |
3268 | else | |
3269 | c_ptr_in = c_ptr_name; | |
3270 | gfc_get_sym_tree (c_ptr_in, ns, ¶m_symtree); | |
3271 | if (param_symtree != NULL) | |
3272 | param_sym = param_symtree->n.sym; | |
3273 | else | |
3274 | gfc_internal_error ("gen_cptr_param(): Unable to " | |
3275 | "create symbol for %s", c_ptr_in); | |
3276 | ||
3277 | /* Set up the appropriate fields for the new c_ptr param sym. */ | |
3278 | param_sym->refs++; | |
3279 | param_sym->attr.flavor = FL_DERIVED; | |
3280 | param_sym->ts.type = BT_DERIVED; | |
3281 | param_sym->attr.intent = INTENT_IN; | |
3282 | param_sym->attr.dummy = 1; | |
3283 | ||
3284 | /* This will pass the ptr to the iso_c routines as a (void *). */ | |
3285 | param_sym->attr.value = 1; | |
3286 | param_sym->attr.use_assoc = 1; | |
3287 | ||
3288 | /* Get the symbol for c_ptr, no matter what it's name is (user renamed). */ | |
3289 | c_ptr_sym = get_iso_c_binding_dt (ISOCBINDING_PTR); | |
3290 | if (c_ptr_sym == NULL) | |
3291 | { | |
3292 | /* This can happen if the user did not define c_ptr but they are | |
3293 | trying to use one of the iso_c_binding functions that need it. */ | |
3294 | gfc_error_now ("Type 'C_PTR' required for ISO_C_BINDING function at %C"); | |
3295 | generate_isocbinding_symbol (module_name, ISOCBINDING_PTR, | |
3296 | (char *) "_gfortran_iso_c_binding_c_ptr"); | |
3297 | ||
3298 | gfc_get_ha_symbol (c_ptr_type, &(c_ptr_sym)); | |
3299 | } | |
3300 | ||
3301 | param_sym->ts.derived = c_ptr_sym; | |
3302 | param_sym->module = gfc_get_string (module_name); | |
3303 | ||
3304 | /* Make new formal arg. */ | |
3305 | formal_arg = gfc_get_formal_arglist (); | |
3306 | /* Add arg to list of formal args (the CPTR arg). */ | |
3307 | add_formal_arg (head, tail, formal_arg, param_sym); | |
3308 | } | |
3309 | ||
3310 | ||
3311 | /* Generates a symbol representing the FPTR argument to an | |
3312 | iso_c_binding procedure. Also, create a gfc_formal_arglist for the | |
3313 | FPTR and add it to the provided argument list. */ | |
3314 | ||
3315 | static void | |
3316 | gen_fptr_param (gfc_formal_arglist **head, | |
3317 | gfc_formal_arglist **tail, | |
3318 | const char *module_name, | |
3319 | gfc_namespace *ns, const char *f_ptr_name) | |
3320 | { | |
3321 | gfc_symbol *param_sym = NULL; | |
3322 | gfc_symtree *param_symtree = NULL; | |
3323 | gfc_formal_arglist *formal_arg = NULL; | |
3324 | const char *f_ptr_out = "gfc_fptr__"; | |
3325 | ||
3326 | if (f_ptr_name != NULL) | |
3327 | f_ptr_out = f_ptr_name; | |
3328 | ||
3329 | gfc_get_sym_tree (f_ptr_out, ns, ¶m_symtree); | |
3330 | if (param_symtree != NULL) | |
3331 | param_sym = param_symtree->n.sym; | |
3332 | else | |
3333 | gfc_internal_error ("generateFPtrParam(): Unable to " | |
3334 | "create symbol for %s", f_ptr_out); | |
3335 | ||
3336 | /* Set up the necessary fields for the fptr output param sym. */ | |
3337 | param_sym->refs++; | |
3338 | param_sym->attr.pointer = 1; | |
3339 | param_sym->attr.dummy = 1; | |
3340 | param_sym->attr.use_assoc = 1; | |
3341 | ||
3342 | /* ISO C Binding type to allow any pointer type as actual param. */ | |
3343 | param_sym->ts.type = BT_VOID; | |
3344 | param_sym->module = gfc_get_string (module_name); | |
3345 | ||
3346 | /* Make the arg. */ | |
3347 | formal_arg = gfc_get_formal_arglist (); | |
3348 | /* Add arg to list of formal args. */ | |
3349 | add_formal_arg (head, tail, formal_arg, param_sym); | |
3350 | } | |
3351 | ||
3352 | ||
3353 | /* Generates a symbol representing the optional SHAPE argument for the | |
3354 | iso_c_binding c_f_pointer() procedure. Also, create a | |
3355 | gfc_formal_arglist for the SHAPE and add it to the provided | |
3356 | argument list. */ | |
3357 | ||
3358 | static void | |
3359 | gen_shape_param (gfc_formal_arglist **head, | |
3360 | gfc_formal_arglist **tail, | |
3361 | const char *module_name, | |
3362 | gfc_namespace *ns, const char *shape_param_name) | |
3363 | { | |
3364 | gfc_symbol *param_sym = NULL; | |
3365 | gfc_symtree *param_symtree = NULL; | |
3366 | gfc_formal_arglist *formal_arg = NULL; | |
3367 | const char *shape_param = "gfc_shape_array__"; | |
3368 | int i; | |
3369 | ||
3370 | if (shape_param_name != NULL) | |
3371 | shape_param = shape_param_name; | |
3372 | ||
3373 | gfc_get_sym_tree (shape_param, ns, ¶m_symtree); | |
3374 | if (param_symtree != NULL) | |
3375 | param_sym = param_symtree->n.sym; | |
3376 | else | |
3377 | gfc_internal_error ("generateShapeParam(): Unable to " | |
3378 | "create symbol for %s", shape_param); | |
3379 | ||
3380 | /* Set up the necessary fields for the shape input param sym. */ | |
3381 | param_sym->refs++; | |
3382 | param_sym->attr.dummy = 1; | |
3383 | param_sym->attr.use_assoc = 1; | |
3384 | ||
3385 | /* Integer array, rank 1, describing the shape of the object. */ | |
3386 | param_sym->ts.type = BT_INTEGER; | |
3387 | param_sym->ts.kind = gfc_default_integer_kind; | |
3388 | param_sym->as = gfc_get_array_spec (); | |
3389 | ||
3390 | /* Clear out the dimension info for the array. */ | |
3391 | for (i = 0; i < GFC_MAX_DIMENSIONS; i++) | |
3392 | { | |
3393 | param_sym->as->lower[i] = NULL; | |
3394 | param_sym->as->upper[i] = NULL; | |
3395 | } | |
3396 | param_sym->as->rank = 1; | |
3397 | param_sym->as->lower[0] = gfc_int_expr (1); | |
3398 | ||
3399 | /* The extent is unknown until we get it. The length give us | |
3400 | the rank the incoming pointer. */ | |
3401 | param_sym->as->type = AS_ASSUMED_SHAPE; | |
3402 | ||
3403 | /* The arg is also optional; it is required iff the second arg | |
3404 | (fptr) is to an array, otherwise, it's ignored. */ | |
3405 | param_sym->attr.optional = 1; | |
3406 | param_sym->attr.intent = INTENT_IN; | |
3407 | param_sym->attr.dimension = 1; | |
3408 | param_sym->module = gfc_get_string (module_name); | |
3409 | ||
3410 | /* Make the arg. */ | |
3411 | formal_arg = gfc_get_formal_arglist (); | |
3412 | /* Add arg to list of formal args. */ | |
3413 | add_formal_arg (head, tail, formal_arg, param_sym); | |
3414 | } | |
3415 | ||
3416 | /* Add a procedure interface to the given symbol (i.e., store a | |
3417 | reference to the list of formal arguments). */ | |
3418 | ||
3419 | static void | |
3420 | add_proc_interface (gfc_symbol *sym, ifsrc source, | |
3421 | gfc_formal_arglist *formal) | |
3422 | { | |
3423 | ||
3424 | sym->formal = formal; | |
3425 | sym->attr.if_source = source; | |
3426 | } | |
3427 | ||
3428 | ||
3429 | /* Builds the parameter list for the iso_c_binding procedure | |
3430 | c_f_pointer or c_f_procpointer. The old_sym typically refers to a | |
3431 | generic version of either the c_f_pointer or c_f_procpointer | |
3432 | functions. The new_proc_sym represents a "resolved" version of the | |
3433 | symbol. The functions are resolved to match the types of their | |
3434 | parameters; for example, c_f_pointer(cptr, fptr) would resolve to | |
3435 | something similar to c_f_pointer_i4 if the type of data object fptr | |
3436 | pointed to was a default integer. The actual name of the resolved | |
3437 | procedure symbol is further mangled with the module name, etc., but | |
3438 | the idea holds true. */ | |
3439 | ||
3440 | static void | |
3441 | build_formal_args (gfc_symbol *new_proc_sym, | |
3442 | gfc_symbol *old_sym, int add_optional_arg) | |
3443 | { | |
3444 | gfc_formal_arglist *head = NULL, *tail = NULL; | |
3445 | gfc_namespace *parent_ns = NULL; | |
3446 | ||
3447 | parent_ns = gfc_current_ns; | |
3448 | /* Create a new namespace, which will be the formal ns (namespace | |
3449 | of the formal args). */ | |
3450 | gfc_current_ns = gfc_get_namespace(parent_ns, 0); | |
3451 | gfc_current_ns->proc_name = new_proc_sym; | |
3452 | ||
3453 | /* Generate the params. */ | |
3454 | if ((old_sym->intmod_sym_id == ISOCBINDING_F_POINTER) || | |
3455 | (old_sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)) | |
3456 | { | |
3457 | gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module, | |
3458 | gfc_current_ns, "cptr"); | |
3459 | gen_fptr_param (&head, &tail, (const char *) new_proc_sym->module, | |
3460 | gfc_current_ns, "fptr"); | |
3461 | ||
3462 | /* If we're dealing with c_f_pointer, it has an optional third arg. */ | |
3463 | if (old_sym->intmod_sym_id == ISOCBINDING_F_POINTER) | |
3464 | { | |
3465 | gen_shape_param (&head, &tail, | |
3466 | (const char *) new_proc_sym->module, | |
3467 | gfc_current_ns, "shape"); | |
3468 | } | |
3469 | } | |
3470 | else if (old_sym->intmod_sym_id == ISOCBINDING_ASSOCIATED) | |
3471 | { | |
3472 | /* c_associated has one required arg and one optional; both | |
3473 | are c_ptrs. */ | |
3474 | gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module, | |
3475 | gfc_current_ns, "c_ptr_1"); | |
3476 | if (add_optional_arg) | |
3477 | { | |
3478 | gen_cptr_param (&head, &tail, (const char *) new_proc_sym->module, | |
3479 | gfc_current_ns, "c_ptr_2"); | |
3480 | /* The last param is optional so mark it as such. */ | |
3481 | tail->sym->attr.optional = 1; | |
3482 | } | |
3483 | } | |
3484 | ||
3485 | /* Add the interface (store formal args to new_proc_sym). */ | |
3486 | add_proc_interface (new_proc_sym, IFSRC_DECL, head); | |
3487 | ||
3488 | /* Set up the formal_ns pointer to the one created for the | |
3489 | new procedure so it'll get cleaned up during gfc_free_symbol(). */ | |
3490 | new_proc_sym->formal_ns = gfc_current_ns; | |
3491 | ||
3492 | gfc_current_ns = parent_ns; | |
3493 | } | |
3494 | ||
3495 | ||
3496 | /* Generate the given set of C interoperable kind objects, or all | |
3497 | interoperable kinds. This function will only be given kind objects | |
3498 | for valid iso_c_binding defined types because this is verified when | |
3499 | the 'use' statement is parsed. If the user gives an 'only' clause, | |
3500 | the specific kinds are looked up; if they don't exist, an error is | |
3501 | reported. If the user does not give an 'only' clause, all | |
3502 | iso_c_binding symbols are generated. If a list of specific kinds | |
3503 | is given, it must have a NULL in the first empty spot to mark the | |
3504 | end of the list. */ | |
3505 | ||
3506 | ||
3507 | void | |
3508 | generate_isocbinding_symbol (const char *mod_name, iso_c_binding_symbol s, | |
3509 | char *local_name) | |
3510 | { | |
3511 | char *name = (local_name && local_name[0]) ? local_name | |
3512 | : c_interop_kinds_table[s].name; | |
3513 | gfc_symtree *tmp_symtree = NULL; | |
3514 | gfc_symbol *tmp_sym = NULL; | |
3515 | gfc_dt_list **dt_list_ptr = NULL; | |
3516 | gfc_component *tmp_comp = NULL; | |
3517 | char comp_name[(GFC_MAX_SYMBOL_LEN * 2) + 1]; | |
3518 | int index; | |
3519 | ||
3520 | tmp_symtree = gfc_find_symtree (gfc_current_ns->sym_root, name); | |
3521 | ||
3522 | /* Already exists in this scope so don't re-add it. | |
3523 | TODO: we should probably check that it's really the same symbol. */ | |
3524 | if (tmp_symtree != NULL) | |
3525 | return; | |
3526 | ||
3527 | /* Create the sym tree in the current ns. */ | |
3528 | gfc_get_sym_tree (name, gfc_current_ns, &tmp_symtree); | |
3529 | if (tmp_symtree) | |
3530 | tmp_sym = tmp_symtree->n.sym; | |
3531 | else | |
3532 | gfc_internal_error ("generate_isocbinding_symbol(): Unable to " | |
3533 | "create symbol"); | |
3534 | ||
3535 | /* Say what module this symbol belongs to. */ | |
3536 | tmp_sym->module = gfc_get_string (mod_name); | |
3537 | tmp_sym->from_intmod = INTMOD_ISO_C_BINDING; | |
3538 | tmp_sym->intmod_sym_id = s; | |
3539 | ||
3540 | switch (s) | |
3541 | { | |
3542 | ||
3543 | #define NAMED_INTCST(a,b,c) case a : | |
3544 | #define NAMED_REALCST(a,b,c) case a : | |
3545 | #define NAMED_CMPXCST(a,b,c) case a : | |
3546 | #define NAMED_LOGCST(a,b,c) case a : | |
3547 | #define NAMED_CHARKNDCST(a,b,c) case a : | |
3548 | #include "iso-c-binding.def" | |
3549 | ||
3550 | tmp_sym->value = gfc_int_expr (c_interop_kinds_table[s].value); | |
3551 | ||
3552 | /* Initialize an integer constant expression node. */ | |
3553 | tmp_sym->attr.flavor = FL_PARAMETER; | |
3554 | tmp_sym->ts.type = BT_INTEGER; | |
3555 | tmp_sym->ts.kind = gfc_default_integer_kind; | |
3556 | ||
3557 | /* Mark this type as a C interoperable one. */ | |
3558 | tmp_sym->ts.is_c_interop = 1; | |
3559 | tmp_sym->ts.is_iso_c = 1; | |
3560 | tmp_sym->value->ts.is_c_interop = 1; | |
3561 | tmp_sym->value->ts.is_iso_c = 1; | |
3562 | tmp_sym->attr.is_c_interop = 1; | |
3563 | ||
3564 | /* Tell what f90 type this c interop kind is valid. */ | |
3565 | tmp_sym->ts.f90_type = c_interop_kinds_table[s].f90_type; | |
3566 | ||
3567 | /* Say it's from the iso_c_binding module. */ | |
3568 | tmp_sym->attr.is_iso_c = 1; | |
3569 | ||
3570 | /* Make it use associated. */ | |
3571 | tmp_sym->attr.use_assoc = 1; | |
3572 | break; | |
3573 | ||
3574 | ||
3575 | #define NAMED_CHARCST(a,b,c) case a : | |
3576 | #include "iso-c-binding.def" | |
3577 | ||
3578 | /* Initialize an integer constant expression node for the | |
3579 | length of the character. */ | |
3580 | tmp_sym->value = gfc_get_expr (); | |
3581 | tmp_sym->value->expr_type = EXPR_CONSTANT; | |
3582 | tmp_sym->value->ts.type = BT_CHARACTER; | |
3583 | tmp_sym->value->ts.kind = gfc_default_character_kind; | |
3584 | tmp_sym->value->where = gfc_current_locus; | |
3585 | tmp_sym->value->ts.is_c_interop = 1; | |
3586 | tmp_sym->value->ts.is_iso_c = 1; | |
3587 | tmp_sym->value->value.character.length = 1; | |
3588 | tmp_sym->value->value.character.string = gfc_getmem (2); | |
3589 | tmp_sym->value->value.character.string[0] | |
3590 | = (char) c_interop_kinds_table[s].value; | |
3591 | tmp_sym->value->value.character.string[1] = '\0'; | |
3592 | ||
3593 | /* May not need this in both attr and ts, but do need in | |
3594 | attr for writing module file. */ | |
3595 | tmp_sym->attr.is_c_interop = 1; | |
3596 | ||
3597 | tmp_sym->attr.flavor = FL_PARAMETER; | |
3598 | tmp_sym->ts.type = BT_CHARACTER; | |
3599 | ||
3600 | /* Need to set it to the C_CHAR kind. */ | |
3601 | tmp_sym->ts.kind = gfc_default_character_kind; | |
3602 | ||
3603 | /* Mark this type as a C interoperable one. */ | |
3604 | tmp_sym->ts.is_c_interop = 1; | |
3605 | tmp_sym->ts.is_iso_c = 1; | |
3606 | ||
3607 | /* Tell what f90 type this c interop kind is valid. */ | |
3608 | tmp_sym->ts.f90_type = BT_CHARACTER; | |
3609 | ||
3610 | /* Say it's from the iso_c_binding module. */ | |
3611 | tmp_sym->attr.is_iso_c = 1; | |
3612 | ||
3613 | /* Make it use associated. */ | |
3614 | tmp_sym->attr.use_assoc = 1; | |
3615 | break; | |
3616 | ||
3617 | case ISOCBINDING_PTR: | |
3618 | case ISOCBINDING_FUNPTR: | |
3619 | ||
3620 | /* Initialize an integer constant expression node. */ | |
3621 | tmp_sym->attr.flavor = FL_DERIVED; | |
3622 | tmp_sym->ts.is_c_interop = 1; | |
3623 | tmp_sym->attr.is_c_interop = 1; | |
3624 | tmp_sym->attr.is_iso_c = 1; | |
3625 | tmp_sym->ts.is_iso_c = 1; | |
3626 | tmp_sym->ts.type = BT_DERIVED; | |
3627 | ||
3628 | /* A derived type must have the bind attribute to be | |
3629 | interoperable (J3/04-007, Section 15.2.3), even though | |
3630 | the binding label is not used. */ | |
3631 | tmp_sym->attr.is_bind_c = 1; | |
3632 | ||
3633 | tmp_sym->attr.referenced = 1; | |
3634 | ||
3635 | tmp_sym->ts.derived = tmp_sym; | |
3636 | ||
3637 | /* Add the symbol created for the derived type to the current ns. */ | |
3638 | dt_list_ptr = &(gfc_derived_types); | |
3639 | while (*dt_list_ptr != NULL && (*dt_list_ptr)->next != NULL) | |
3640 | dt_list_ptr = &((*dt_list_ptr)->next); | |
3641 | ||
3642 | /* There is already at least one derived type in the list, so append | |
3643 | the one we're currently building for c_ptr or c_funptr. */ | |
3644 | if (*dt_list_ptr != NULL) | |
3645 | dt_list_ptr = &((*dt_list_ptr)->next); | |
3646 | (*dt_list_ptr) = gfc_get_dt_list (); | |
3647 | (*dt_list_ptr)->derived = tmp_sym; | |
3648 | (*dt_list_ptr)->next = NULL; | |
3649 | ||
3650 | /* Set up the component of the derived type, which will be | |
3651 | an integer with kind equal to c_ptr_size. Mangle the name of | |
3652 | the field for the c_address to prevent the curious user from | |
3653 | trying to access it from Fortran. */ | |
3654 | sprintf (comp_name, "__%s_%s", tmp_sym->name, "c_address"); | |
3655 | gfc_add_component (tmp_sym, comp_name, &tmp_comp); | |
3656 | if (tmp_comp == NULL) | |
3657 | gfc_internal_error ("generate_isocbinding_symbol(): Unable to " | |
3658 | "create component for c_address"); | |
3659 | ||
3660 | tmp_comp->ts.type = BT_INTEGER; | |
3661 | ||
3662 | /* Set this because the module will need to read/write this field. */ | |
3663 | tmp_comp->ts.f90_type = BT_INTEGER; | |
3664 | ||
3665 | /* The kinds for c_ptr and c_funptr are the same. */ | |
3666 | index = get_c_kind ("c_ptr", c_interop_kinds_table); | |
3667 | tmp_comp->ts.kind = c_interop_kinds_table[index].value; | |
3668 | ||
3669 | tmp_comp->pointer = 0; | |
3670 | tmp_comp->dimension = 0; | |
3671 | ||
3672 | /* Mark the component as C interoperable. */ | |
3673 | tmp_comp->ts.is_c_interop = 1; | |
3674 | ||
3675 | /* Make it use associated (iso_c_binding module). */ | |
3676 | tmp_sym->attr.use_assoc = 1; | |
3677 | break; | |
3678 | ||
3679 | case ISOCBINDING_NULL_PTR: | |
3680 | case ISOCBINDING_NULL_FUNPTR: | |
3681 | gen_special_c_interop_ptr (s, name, mod_name); | |
3682 | break; | |
3683 | ||
3684 | case ISOCBINDING_F_POINTER: | |
3685 | case ISOCBINDING_ASSOCIATED: | |
3686 | case ISOCBINDING_LOC: | |
3687 | case ISOCBINDING_FUNLOC: | |
3688 | case ISOCBINDING_F_PROCPOINTER: | |
3689 | ||
3690 | tmp_sym->attr.proc = PROC_MODULE; | |
3691 | ||
3692 | /* Use the procedure's name as it is in the iso_c_binding module for | |
3693 | setting the binding label in case the user renamed the symbol. */ | |
3694 | sprintf (tmp_sym->binding_label, "%s_%s", mod_name, | |
3695 | c_interop_kinds_table[s].name); | |
3696 | tmp_sym->attr.is_iso_c = 1; | |
3697 | if (s == ISOCBINDING_F_POINTER || s == ISOCBINDING_F_PROCPOINTER) | |
3698 | tmp_sym->attr.subroutine = 1; | |
3699 | else | |
3700 | { | |
3701 | /* TODO! This needs to be finished more for the expr of the | |
3702 | function or something! | |
3703 | This may not need to be here, because trying to do c_loc | |
3704 | as an external. */ | |
3705 | if (s == ISOCBINDING_ASSOCIATED) | |
3706 | { | |
3707 | tmp_sym->attr.function = 1; | |
3708 | tmp_sym->ts.type = BT_LOGICAL; | |
3709 | tmp_sym->ts.kind = gfc_default_logical_kind; | |
3710 | tmp_sym->result = tmp_sym; | |
3711 | } | |
3712 | else | |
3713 | { | |
3714 | /* Here, we're taking the simple approach. We're defining | |
3715 | c_loc as an external identifier so the compiler will put | |
3716 | what we expect on the stack for the address we want the | |
3717 | C address of. */ | |
3718 | tmp_sym->ts.type = BT_DERIVED; | |
3719 | if (s == ISOCBINDING_LOC) | |
3720 | tmp_sym->ts.derived = | |
3721 | get_iso_c_binding_dt (ISOCBINDING_PTR); | |
3722 | else | |
3723 | tmp_sym->ts.derived = | |
3724 | get_iso_c_binding_dt (ISOCBINDING_FUNPTR); | |
3725 | ||
3726 | if (tmp_sym->ts.derived == NULL) | |
3727 | { | |
3728 | /* Create the necessary derived type so we can continue | |
3729 | processing the file. */ | |
3730 | generate_isocbinding_symbol | |
3731 | (mod_name, s == ISOCBINDING_FUNLOC | |
3732 | ? ISOCBINDING_FUNPTR : ISOCBINDING_FUNPTR, | |
3733 | (char *)(s == ISOCBINDING_FUNLOC | |
3734 | ? "_gfortran_iso_c_binding_c_funptr" | |
3735 | : "_gfortran_iso_c_binding_c_ptr")); | |
3736 | tmp_sym->ts.derived = | |
3737 | get_iso_c_binding_dt (s == ISOCBINDING_FUNLOC | |
3738 | ? ISOCBINDING_FUNPTR | |
3739 | : ISOCBINDING_PTR); | |
3740 | } | |
3741 | ||
3742 | /* The function result is itself (no result clause). */ | |
3743 | tmp_sym->result = tmp_sym; | |
3744 | tmp_sym->attr.external = 1; | |
3745 | tmp_sym->attr.use_assoc = 0; | |
3746 | tmp_sym->attr.if_source = IFSRC_UNKNOWN; | |
3747 | tmp_sym->attr.proc = PROC_UNKNOWN; | |
3748 | } | |
3749 | } | |
3750 | ||
3751 | tmp_sym->attr.flavor = FL_PROCEDURE; | |
3752 | tmp_sym->attr.contained = 0; | |
3753 | ||
3754 | /* Try using this builder routine, with the new and old symbols | |
3755 | both being the generic iso_c proc sym being created. This | |
3756 | will create the formal args (and the new namespace for them). | |
3757 | Don't build an arg list for c_loc because we're going to treat | |
3758 | c_loc as an external procedure. */ | |
3759 | if (s != ISOCBINDING_LOC && s != ISOCBINDING_FUNLOC) | |
3760 | /* The 1 says to add any optional args, if applicable. */ | |
3761 | build_formal_args (tmp_sym, tmp_sym, 1); | |
3762 | ||
3763 | /* Set this after setting up the symbol, to prevent error messages. */ | |
3764 | tmp_sym->attr.use_assoc = 1; | |
3765 | ||
3766 | /* This symbol will not be referenced directly. It will be | |
3767 | resolved to the implementation for the given f90 kind. */ | |
3768 | tmp_sym->attr.referenced = 0; | |
3769 | ||
3770 | break; | |
3771 | ||
3772 | default: | |
3773 | gcc_unreachable (); | |
3774 | } | |
3775 | } | |
3776 | ||
3777 | ||
3778 | /* Creates a new symbol based off of an old iso_c symbol, with a new | |
3779 | binding label. This function can be used to create a new, | |
3780 | resolved, version of a procedure symbol for c_f_pointer or | |
3781 | c_f_procpointer that is based on the generic symbols. A new | |
3782 | parameter list is created for the new symbol using | |
3783 | build_formal_args(). The add_optional_flag specifies whether the | |
3784 | to add the optional SHAPE argument. The new symbol is | |
3785 | returned. */ | |
3786 | ||
3787 | gfc_symbol * | |
3788 | get_iso_c_sym (gfc_symbol *old_sym, char *new_name, | |
3789 | char *new_binding_label, int add_optional_arg) | |
3790 | { | |
3791 | gfc_symtree *new_symtree = NULL; | |
3792 | ||
3793 | /* See if we have a symbol by that name already available, looking | |
3794 | through any parent namespaces. */ | |
3795 | gfc_find_sym_tree (new_name, gfc_current_ns, 1, &new_symtree); | |
3796 | if (new_symtree != NULL) | |
3797 | /* Return the existing symbol. */ | |
3798 | return new_symtree->n.sym; | |
3799 | ||
3800 | /* Create the symtree/symbol, with attempted host association. */ | |
3801 | gfc_get_ha_sym_tree (new_name, &new_symtree); | |
3802 | if (new_symtree == NULL) | |
3803 | gfc_internal_error ("get_iso_c_sym(): Unable to create " | |
3804 | "symtree for '%s'", new_name); | |
3805 | ||
3806 | /* Now fill in the fields of the resolved symbol with the old sym. */ | |
3807 | strcpy (new_symtree->n.sym->binding_label, new_binding_label); | |
3808 | new_symtree->n.sym->attr = old_sym->attr; | |
3809 | new_symtree->n.sym->ts = old_sym->ts; | |
3810 | new_symtree->n.sym->module = gfc_get_string (old_sym->module); | |
3811 | /* Build the formal arg list. */ | |
3812 | build_formal_args (new_symtree->n.sym, old_sym, add_optional_arg); | |
3813 | ||
3814 | gfc_commit_symbol (new_symtree->n.sym); | |
3815 | ||
3816 | return new_symtree->n.sym; | |
3817 | } | |
3818 |