2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
31 /* Current statement label. Zero means no statement label. Because new_st
32 can get wiped during statement matching, we have to keep it separate. */
34 gfc_st_label *gfc_statement_label;
36 static locus label_locus;
37 static jmp_buf eof_buf;
39 gfc_state_data *gfc_state_stack;
41 /* TODO: Re-order functions to kill these forward decls. */
42 static void check_statement_label (gfc_statement);
43 static void undo_new_statement (void);
44 static void reject_statement (void);
47 /* A sort of half-matching function. We try to match the word on the
48 input with the passed string. If this succeeds, we call the
49 keyword-dependent matching function that will match the rest of the
50 statement. For single keywords, the matching subroutine is
54 match_word (const char *str, match (*subr) (void), locus *old_locus)
69 gfc_current_locus = *old_locus;
77 /* Figure out what the next statement is, (mostly) regardless of
78 proper ordering. The do...while(0) is there to prevent if/else
81 #define match(keyword, subr, st) \
83 if (match_word(keyword, subr, &old_locus) == MATCH_YES) \
86 undo_new_statement (); \
90 /* This is a specialist version of decode_statement that is used
91 for the specification statements in a function, whose
92 characteristics are deferred into the specification statements.
93 eg.: INTEGER (king = mykind) foo ()
94 USE mymodule, ONLY mykind.....
95 The KIND parameter needs a return after USE or IMPORT, whereas
96 derived type declarations can occur anywhere, up the executable
97 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
98 out of the correct kind of specification statements. */
100 decode_specification_statement (void)
106 if (gfc_match_eos () == MATCH_YES)
109 old_locus = gfc_current_locus;
111 match ("import", gfc_match_import, ST_IMPORT);
112 match ("use", gfc_match_use, ST_USE);
114 if (gfc_current_block ()->result->ts.type != BT_DERIVED)
117 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
118 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
119 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
121 /* General statement matching: Instead of testing every possible
122 statement, we eliminate most possibilities by peeking at the
125 c = gfc_peek_ascii_char ();
130 match ("abstract% interface", gfc_match_abstract_interface,
132 match ("allocatable", gfc_match_asynchronous, ST_ATTR_DECL);
133 match ("asynchronous", gfc_match_asynchronous, ST_ATTR_DECL);
137 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
141 match ("codimension", gfc_match_codimension, ST_ATTR_DECL);
142 match ("contiguous", gfc_match_contiguous, ST_ATTR_DECL);
146 match ("data", gfc_match_data, ST_DATA);
147 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
151 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
152 match ("entry% ", gfc_match_entry, ST_ENTRY);
153 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
154 match ("external", gfc_match_external, ST_ATTR_DECL);
158 match ("format", gfc_match_format, ST_FORMAT);
165 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
166 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
167 match ("interface", gfc_match_interface, ST_INTERFACE);
168 match ("intent", gfc_match_intent, ST_ATTR_DECL);
169 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
176 match ("namelist", gfc_match_namelist, ST_NAMELIST);
180 match ("optional", gfc_match_optional, ST_ATTR_DECL);
184 match ("parameter", gfc_match_parameter, ST_PARAMETER);
185 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
186 if (gfc_match_private (&st) == MATCH_YES)
188 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
189 if (gfc_match_public (&st) == MATCH_YES)
191 match ("protected", gfc_match_protected, ST_ATTR_DECL);
198 match ("save", gfc_match_save, ST_ATTR_DECL);
202 match ("target", gfc_match_target, ST_ATTR_DECL);
203 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
210 match ("value", gfc_match_value, ST_ATTR_DECL);
211 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
218 /* This is not a specification statement. See if any of the matchers
219 has stored an error message of some sort. */
223 gfc_buffer_error (0);
224 gfc_current_locus = old_locus;
226 return ST_GET_FCN_CHARACTERISTICS;
230 /* This is the primary 'decode_statement'. */
232 decode_statement (void)
239 gfc_enforce_clean_symbol_state ();
241 gfc_clear_error (); /* Clear any pending errors. */
242 gfc_clear_warning (); /* Clear any pending warnings. */
244 gfc_matching_function = false;
246 if (gfc_match_eos () == MATCH_YES)
249 if (gfc_current_state () == COMP_FUNCTION
250 && gfc_current_block ()->result->ts.kind == -1)
251 return decode_specification_statement ();
253 old_locus = gfc_current_locus;
255 /* Try matching a data declaration or function declaration. The
256 input "REALFUNCTIONA(N)" can mean several things in different
257 contexts, so it (and its relatives) get special treatment. */
259 if (gfc_current_state () == COMP_NONE
260 || gfc_current_state () == COMP_INTERFACE
261 || gfc_current_state () == COMP_CONTAINS)
263 gfc_matching_function = true;
264 m = gfc_match_function_decl ();
267 else if (m == MATCH_ERROR)
271 gfc_current_locus = old_locus;
273 gfc_matching_function = false;
276 /* Match statements whose error messages are meant to be overwritten
277 by something better. */
279 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
280 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
281 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
283 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
284 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
286 /* Try to match a subroutine statement, which has the same optional
287 prefixes that functions can have. */
289 if (gfc_match_subroutine () == MATCH_YES)
290 return ST_SUBROUTINE;
292 gfc_current_locus = old_locus;
294 /* Check for the IF, DO, SELECT, WHERE, FORALL, CRITICAL, BLOCK and ASSOCIATE
295 statements, which might begin with a block label. The match functions for
296 these statements are unusual in that their keyword is not seen before
297 the matcher is called. */
299 if (gfc_match_if (&st) == MATCH_YES)
302 gfc_current_locus = old_locus;
304 if (gfc_match_where (&st) == MATCH_YES)
307 gfc_current_locus = old_locus;
309 if (gfc_match_forall (&st) == MATCH_YES)
312 gfc_current_locus = old_locus;
314 match (NULL, gfc_match_do, ST_DO);
315 match (NULL, gfc_match_block, ST_BLOCK);
316 match (NULL, gfc_match_associate, ST_ASSOCIATE);
317 match (NULL, gfc_match_critical, ST_CRITICAL);
318 match (NULL, gfc_match_select, ST_SELECT_CASE);
319 match (NULL, gfc_match_select_type, ST_SELECT_TYPE);
321 /* General statement matching: Instead of testing every possible
322 statement, we eliminate most possibilities by peeking at the
325 c = gfc_peek_ascii_char ();
330 match ("abstract% interface", gfc_match_abstract_interface,
332 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
333 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
334 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
335 match ("asynchronous", gfc_match_asynchronous, ST_ATTR_DECL);
339 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
340 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
341 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
345 match ("call", gfc_match_call, ST_CALL);
346 match ("close", gfc_match_close, ST_CLOSE);
347 match ("continue", gfc_match_continue, ST_CONTINUE);
348 match ("contiguous", gfc_match_contiguous, ST_ATTR_DECL);
349 match ("cycle", gfc_match_cycle, ST_CYCLE);
350 match ("case", gfc_match_case, ST_CASE);
351 match ("common", gfc_match_common, ST_COMMON);
352 match ("contains", gfc_match_eos, ST_CONTAINS);
353 match ("class", gfc_match_class_is, ST_CLASS_IS);
354 match ("codimension", gfc_match_codimension, ST_ATTR_DECL);
358 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
359 match ("data", gfc_match_data, ST_DATA);
360 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
364 match ("end file", gfc_match_endfile, ST_END_FILE);
365 match ("exit", gfc_match_exit, ST_EXIT);
366 match ("else", gfc_match_else, ST_ELSE);
367 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
368 match ("else if", gfc_match_elseif, ST_ELSEIF);
369 match ("error stop", gfc_match_error_stop, ST_ERROR_STOP);
370 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
372 if (gfc_match_end (&st) == MATCH_YES)
375 match ("entry% ", gfc_match_entry, ST_ENTRY);
376 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
377 match ("external", gfc_match_external, ST_ATTR_DECL);
381 match ("final", gfc_match_final_decl, ST_FINAL);
382 match ("flush", gfc_match_flush, ST_FLUSH);
383 match ("format", gfc_match_format, ST_FORMAT);
387 match ("generic", gfc_match_generic, ST_GENERIC);
388 match ("go to", gfc_match_goto, ST_GOTO);
392 match ("inquire", gfc_match_inquire, ST_INQUIRE);
393 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
394 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
395 match ("import", gfc_match_import, ST_IMPORT);
396 match ("interface", gfc_match_interface, ST_INTERFACE);
397 match ("intent", gfc_match_intent, ST_ATTR_DECL);
398 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
402 match ("lock", gfc_match_lock, ST_LOCK);
406 match ("module% procedure", gfc_match_modproc, ST_MODULE_PROC);
407 match ("module", gfc_match_module, ST_MODULE);
411 match ("nullify", gfc_match_nullify, ST_NULLIFY);
412 match ("namelist", gfc_match_namelist, ST_NAMELIST);
416 match ("open", gfc_match_open, ST_OPEN);
417 match ("optional", gfc_match_optional, ST_ATTR_DECL);
421 match ("print", gfc_match_print, ST_WRITE);
422 match ("parameter", gfc_match_parameter, ST_PARAMETER);
423 match ("pause", gfc_match_pause, ST_PAUSE);
424 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
425 if (gfc_match_private (&st) == MATCH_YES)
427 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
428 match ("program", gfc_match_program, ST_PROGRAM);
429 if (gfc_match_public (&st) == MATCH_YES)
431 match ("protected", gfc_match_protected, ST_ATTR_DECL);
435 match ("read", gfc_match_read, ST_READ);
436 match ("return", gfc_match_return, ST_RETURN);
437 match ("rewind", gfc_match_rewind, ST_REWIND);
441 match ("sequence", gfc_match_eos, ST_SEQUENCE);
442 match ("stop", gfc_match_stop, ST_STOP);
443 match ("save", gfc_match_save, ST_ATTR_DECL);
444 match ("sync all", gfc_match_sync_all, ST_SYNC_ALL);
445 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
446 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
450 match ("target", gfc_match_target, ST_ATTR_DECL);
451 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
452 match ("type is", gfc_match_type_is, ST_TYPE_IS);
456 match ("unlock", gfc_match_unlock, ST_UNLOCK);
457 match ("use", gfc_match_use, ST_USE);
461 match ("value", gfc_match_value, ST_ATTR_DECL);
462 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
466 match ("wait", gfc_match_wait, ST_WAIT);
467 match ("write", gfc_match_write, ST_WRITE);
471 /* All else has failed, so give up. See if any of the matchers has
472 stored an error message of some sort. */
474 if (gfc_error_check () == 0)
475 gfc_error_now ("Unclassifiable statement at %C");
479 gfc_error_recovery ();
485 decode_omp_directive (void)
490 gfc_enforce_clean_symbol_state ();
492 gfc_clear_error (); /* Clear any pending errors. */
493 gfc_clear_warning (); /* Clear any pending warnings. */
497 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
498 "or ELEMENTAL procedures");
499 gfc_error_recovery ();
503 if (gfc_implicit_pure (NULL))
504 gfc_current_ns->proc_name->attr.implicit_pure = 0;
506 old_locus = gfc_current_locus;
508 /* General OpenMP directive matching: Instead of testing every possible
509 statement, we eliminate most possibilities by peeking at the
512 c = gfc_peek_ascii_char ();
517 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
520 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
523 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
526 match ("do", gfc_match_omp_do, ST_OMP_DO);
529 match ("end atomic", gfc_match_omp_eos, ST_OMP_END_ATOMIC);
530 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
531 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
532 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
533 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
534 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
535 match ("end parallel sections", gfc_match_omp_eos,
536 ST_OMP_END_PARALLEL_SECTIONS);
537 match ("end parallel workshare", gfc_match_omp_eos,
538 ST_OMP_END_PARALLEL_WORKSHARE);
539 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
540 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
541 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
542 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
543 match ("end workshare", gfc_match_omp_end_nowait,
544 ST_OMP_END_WORKSHARE);
547 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
550 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
553 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
556 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
557 match ("parallel sections", gfc_match_omp_parallel_sections,
558 ST_OMP_PARALLEL_SECTIONS);
559 match ("parallel workshare", gfc_match_omp_parallel_workshare,
560 ST_OMP_PARALLEL_WORKSHARE);
561 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
564 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
565 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
566 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
569 match ("task", gfc_match_omp_task, ST_OMP_TASK);
570 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
571 match ("taskyield", gfc_match_omp_taskyield, ST_OMP_TASKYIELD);
572 match ("threadprivate", gfc_match_omp_threadprivate,
573 ST_OMP_THREADPRIVATE);
575 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
579 /* All else has failed, so give up. See if any of the matchers has
580 stored an error message of some sort. */
582 if (gfc_error_check () == 0)
583 gfc_error_now ("Unclassifiable OpenMP directive at %C");
587 gfc_error_recovery ();
593 decode_gcc_attribute (void)
597 gfc_enforce_clean_symbol_state ();
599 gfc_clear_error (); /* Clear any pending errors. */
600 gfc_clear_warning (); /* Clear any pending warnings. */
601 old_locus = gfc_current_locus;
603 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
605 /* All else has failed, so give up. See if any of the matchers has
606 stored an error message of some sort. */
608 if (gfc_error_check () == 0)
609 gfc_error_now ("Unclassifiable GCC directive at %C");
613 gfc_error_recovery ();
621 /* Get the next statement in free form source. */
630 at_bol = gfc_at_bol ();
631 gfc_gobble_whitespace ();
633 c = gfc_peek_ascii_char ();
639 /* Found a statement label? */
640 m = gfc_match_st_label (&gfc_statement_label);
642 d = gfc_peek_ascii_char ();
643 if (m != MATCH_YES || !gfc_is_whitespace (d))
645 gfc_match_small_literal_int (&i, &cnt);
648 gfc_error_now ("Too many digits in statement label at %C");
651 gfc_error_now ("Zero is not a valid statement label at %C");
654 c = gfc_next_ascii_char ();
657 if (!gfc_is_whitespace (c))
658 gfc_error_now ("Non-numeric character in statement label at %C");
664 label_locus = gfc_current_locus;
666 gfc_gobble_whitespace ();
668 if (at_bol && gfc_peek_ascii_char () == ';')
670 gfc_error_now ("Semicolon at %C needs to be preceded by "
672 gfc_next_ascii_char (); /* Eat up the semicolon. */
676 if (gfc_match_eos () == MATCH_YES)
678 gfc_warning_now ("Ignoring statement label in empty statement "
679 "at %L", &label_locus);
680 gfc_free_st_label (gfc_statement_label);
681 gfc_statement_label = NULL;
688 /* Comments have already been skipped by the time we get here,
689 except for GCC attributes and OpenMP directives. */
691 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
692 c = gfc_peek_ascii_char ();
698 c = gfc_next_ascii_char ();
699 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
700 gcc_assert (c == "gcc$"[i]);
702 gfc_gobble_whitespace ();
703 return decode_gcc_attribute ();
706 else if (c == '$' && gfc_option.gfc_flag_openmp)
710 c = gfc_next_ascii_char ();
711 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
712 gcc_assert (c == "$omp"[i]);
714 gcc_assert (c == ' ' || c == '\t');
715 gfc_gobble_whitespace ();
716 return decode_omp_directive ();
722 if (at_bol && c == ';')
724 if (!(gfc_option.allow_std & GFC_STD_F2008))
725 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
727 gfc_next_ascii_char (); /* Eat up the semicolon. */
731 return decode_statement ();
735 /* Get the next statement in fixed-form source. */
740 int label, digit_flag, i;
745 return decode_statement ();
747 /* Skip past the current label field, parsing a statement label if
748 one is there. This is a weird number parser, since the number is
749 contained within five columns and can have any kind of embedded
750 spaces. We also check for characters that make the rest of the
756 for (i = 0; i < 5; i++)
758 c = gfc_next_char_literal (NONSTRING);
775 label = label * 10 + ((unsigned char) c - '0');
776 label_locus = gfc_current_locus;
780 /* Comments have already been skipped by the time we get
781 here, except for GCC attributes and OpenMP directives. */
784 c = gfc_next_char_literal (NONSTRING);
786 if (TOLOWER (c) == 'g')
788 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
789 gcc_assert (TOLOWER (c) == "gcc$"[i]);
791 return decode_gcc_attribute ();
793 else if (c == '$' && gfc_option.gfc_flag_openmp)
795 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
796 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
798 if (c != ' ' && c != '0')
800 gfc_buffer_error (0);
801 gfc_error ("Bad continuation line at %C");
805 return decode_omp_directive ();
809 /* Comments have already been skipped by the time we get
810 here so don't bother checking for them. */
813 gfc_buffer_error (0);
814 gfc_error ("Non-numeric character in statement label at %C");
822 gfc_warning_now ("Zero is not a valid statement label at %C");
825 /* We've found a valid statement label. */
826 gfc_statement_label = gfc_get_st_label (label);
830 /* Since this line starts a statement, it cannot be a continuation
831 of a previous statement. If we see something here besides a
832 space or zero, it must be a bad continuation line. */
834 c = gfc_next_char_literal (NONSTRING);
838 if (c != ' ' && c != '0')
840 gfc_buffer_error (0);
841 gfc_error ("Bad continuation line at %C");
845 /* Now that we've taken care of the statement label columns, we have
846 to make sure that the first nonblank character is not a '!'. If
847 it is, the rest of the line is a comment. */
851 loc = gfc_current_locus;
852 c = gfc_next_char_literal (NONSTRING);
854 while (gfc_is_whitespace (c));
858 gfc_current_locus = loc;
863 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
864 else if (!(gfc_option.allow_std & GFC_STD_F2008))
865 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
870 if (gfc_match_eos () == MATCH_YES)
873 /* At this point, we've got a nonblank statement to parse. */
874 return decode_statement ();
878 gfc_warning_now ("Ignoring statement label in empty statement at %L",
881 gfc_current_locus.lb->truncated = 0;
887 /* Return the next non-ST_NONE statement to the caller. We also worry
888 about including files and the ends of include files at this stage. */
891 next_statement (void)
896 gfc_enforce_clean_symbol_state ();
898 gfc_new_block = NULL;
900 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
901 gfc_current_ns->old_equiv = gfc_current_ns->equiv;
904 gfc_statement_label = NULL;
905 gfc_buffer_error (1);
910 gfc_skip_comments ();
918 if (gfc_define_undef_line ())
921 old_locus = gfc_current_locus;
923 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
929 gfc_buffer_error (0);
931 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
933 gfc_free_st_label (gfc_statement_label);
934 gfc_statement_label = NULL;
935 gfc_current_locus = old_locus;
939 check_statement_label (st);
945 /****************************** Parser ***********************************/
947 /* The parser subroutines are of type 'try' that fail if the file ends
950 /* Macros that expand to case-labels for various classes of
951 statements. Start with executable statements that directly do
954 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
955 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
956 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
957 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
958 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
959 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
960 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
961 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
962 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT: case ST_OMP_TASKYIELD: \
963 case ST_ERROR_STOP: case ST_SYNC_ALL: case ST_SYNC_IMAGES: \
964 case ST_SYNC_MEMORY: case ST_LOCK: case ST_UNLOCK
966 /* Statements that mark other executable statements. */
968 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: \
969 case ST_IF_BLOCK: case ST_BLOCK: case ST_ASSOCIATE: \
970 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_SELECT_TYPE: \
971 case ST_OMP_PARALLEL: \
972 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
973 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
974 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
975 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
976 case ST_OMP_TASK: case ST_CRITICAL
978 /* Declaration statements */
980 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
981 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
982 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
985 /* Block end statements. Errors associated with interchanging these
986 are detected in gfc_match_end(). */
988 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
989 case ST_END_PROGRAM: case ST_END_SUBROUTINE: \
990 case ST_END_BLOCK: case ST_END_ASSOCIATE
993 /* Push a new state onto the stack. */
996 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
998 p->state = new_state;
999 p->previous = gfc_state_stack;
1001 p->head = p->tail = NULL;
1002 p->do_variable = NULL;
1004 /* If this the state of a construct like BLOCK, DO or IF, the corresponding
1005 construct statement was accepted right before pushing the state. Thus,
1006 the construct's gfc_code is available as tail of the parent state. */
1007 gcc_assert (gfc_state_stack);
1008 p->construct = gfc_state_stack->tail;
1010 gfc_state_stack = p;
1014 /* Pop the current state. */
1018 gfc_state_stack = gfc_state_stack->previous;
1022 /* Try to find the given state in the state stack. */
1025 gfc_find_state (gfc_compile_state state)
1029 for (p = gfc_state_stack; p; p = p->previous)
1030 if (p->state == state)
1033 return (p == NULL) ? FAILURE : SUCCESS;
1037 /* Starts a new level in the statement list. */
1040 new_level (gfc_code *q)
1044 p = q->block = gfc_get_code ();
1046 gfc_state_stack->head = gfc_state_stack->tail = p;
1052 /* Add the current new_st code structure and adds it to the current
1053 program unit. As a side-effect, it zeroes the new_st. */
1056 add_statement (void)
1060 p = gfc_get_code ();
1063 p->loc = gfc_current_locus;
1065 if (gfc_state_stack->head == NULL)
1066 gfc_state_stack->head = p;
1068 gfc_state_stack->tail->next = p;
1070 while (p->next != NULL)
1073 gfc_state_stack->tail = p;
1075 gfc_clear_new_st ();
1081 /* Frees everything associated with the current statement. */
1084 undo_new_statement (void)
1086 gfc_free_statements (new_st.block);
1087 gfc_free_statements (new_st.next);
1088 gfc_free_statement (&new_st);
1089 gfc_clear_new_st ();
1093 /* If the current statement has a statement label, make sure that it
1094 is allowed to, or should have one. */
1097 check_statement_label (gfc_statement st)
1101 if (gfc_statement_label == NULL)
1103 if (st == ST_FORMAT)
1104 gfc_error ("FORMAT statement at %L does not have a statement label",
1111 case ST_END_PROGRAM:
1112 case ST_END_FUNCTION:
1113 case ST_END_SUBROUTINE:
1117 case ST_END_CRITICAL:
1120 type = ST_LABEL_TARGET;
1124 type = ST_LABEL_FORMAT;
1127 /* Statement labels are not restricted from appearing on a
1128 particular line. However, there are plenty of situations
1129 where the resulting label can't be referenced. */
1132 type = ST_LABEL_BAD_TARGET;
1136 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1138 new_st.here = gfc_statement_label;
1142 /* Figures out what the enclosing program unit is. This will be a
1143 function, subroutine, program, block data or module. */
1146 gfc_enclosing_unit (gfc_compile_state * result)
1150 for (p = gfc_state_stack; p; p = p->previous)
1151 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1152 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1153 || p->state == COMP_PROGRAM)
1162 *result = COMP_PROGRAM;
1167 /* Translate a statement enum to a string. */
1170 gfc_ascii_statement (gfc_statement st)
1176 case ST_ARITHMETIC_IF:
1177 p = _("arithmetic IF");
1186 p = _("attribute declaration");
1222 p = _("data declaration");
1230 case ST_DERIVED_DECL:
1231 p = _("derived type declaration");
1245 case ST_END_ASSOCIATE:
1246 p = "END ASSOCIATE";
1251 case ST_END_BLOCK_DATA:
1252 p = "END BLOCK DATA";
1254 case ST_END_CRITICAL:
1266 case ST_END_FUNCTION:
1272 case ST_END_INTERFACE:
1273 p = "END INTERFACE";
1278 case ST_END_PROGRAM:
1284 case ST_END_SUBROUTINE:
1285 p = "END SUBROUTINE";
1296 case ST_EQUIVALENCE:
1308 case ST_FORALL_BLOCK: /* Fall through */
1330 case ST_IMPLICIT_NONE:
1331 p = "IMPLICIT NONE";
1333 case ST_IMPLIED_ENDDO:
1334 p = _("implied END DO");
1363 case ST_MODULE_PROC:
1364 p = "MODULE PROCEDURE";
1396 case ST_SYNC_IMAGES:
1399 case ST_SYNC_MEMORY:
1414 case ST_WHERE_BLOCK: /* Fall through */
1425 p = _("assignment");
1427 case ST_POINTER_ASSIGNMENT:
1428 p = _("pointer assignment");
1430 case ST_SELECT_CASE:
1433 case ST_SELECT_TYPE:
1448 case ST_STATEMENT_FUNCTION:
1449 p = "STATEMENT FUNCTION";
1451 case ST_LABEL_ASSIGNMENT:
1452 p = "LABEL ASSIGNMENT";
1455 p = "ENUM DEFINITION";
1458 p = "ENUMERATOR DEFINITION";
1466 case ST_OMP_BARRIER:
1467 p = "!$OMP BARRIER";
1469 case ST_OMP_CRITICAL:
1470 p = "!$OMP CRITICAL";
1475 case ST_OMP_END_ATOMIC:
1476 p = "!$OMP END ATOMIC";
1478 case ST_OMP_END_CRITICAL:
1479 p = "!$OMP END CRITICAL";
1484 case ST_OMP_END_MASTER:
1485 p = "!$OMP END MASTER";
1487 case ST_OMP_END_ORDERED:
1488 p = "!$OMP END ORDERED";
1490 case ST_OMP_END_PARALLEL:
1491 p = "!$OMP END PARALLEL";
1493 case ST_OMP_END_PARALLEL_DO:
1494 p = "!$OMP END PARALLEL DO";
1496 case ST_OMP_END_PARALLEL_SECTIONS:
1497 p = "!$OMP END PARALLEL SECTIONS";
1499 case ST_OMP_END_PARALLEL_WORKSHARE:
1500 p = "!$OMP END PARALLEL WORKSHARE";
1502 case ST_OMP_END_SECTIONS:
1503 p = "!$OMP END SECTIONS";
1505 case ST_OMP_END_SINGLE:
1506 p = "!$OMP END SINGLE";
1508 case ST_OMP_END_TASK:
1509 p = "!$OMP END TASK";
1511 case ST_OMP_END_WORKSHARE:
1512 p = "!$OMP END WORKSHARE";
1520 case ST_OMP_ORDERED:
1521 p = "!$OMP ORDERED";
1523 case ST_OMP_PARALLEL:
1524 p = "!$OMP PARALLEL";
1526 case ST_OMP_PARALLEL_DO:
1527 p = "!$OMP PARALLEL DO";
1529 case ST_OMP_PARALLEL_SECTIONS:
1530 p = "!$OMP PARALLEL SECTIONS";
1532 case ST_OMP_PARALLEL_WORKSHARE:
1533 p = "!$OMP PARALLEL WORKSHARE";
1535 case ST_OMP_SECTIONS:
1536 p = "!$OMP SECTIONS";
1538 case ST_OMP_SECTION:
1539 p = "!$OMP SECTION";
1547 case ST_OMP_TASKWAIT:
1548 p = "!$OMP TASKWAIT";
1550 case ST_OMP_TASKYIELD:
1551 p = "!$OMP TASKYIELD";
1553 case ST_OMP_THREADPRIVATE:
1554 p = "!$OMP THREADPRIVATE";
1556 case ST_OMP_WORKSHARE:
1557 p = "!$OMP WORKSHARE";
1560 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1567 /* Create a symbol for the main program and assign it to ns->proc_name. */
1570 main_program_symbol (gfc_namespace *ns, const char *name)
1572 gfc_symbol *main_program;
1573 symbol_attribute attr;
1575 gfc_get_symbol (name, ns, &main_program);
1576 gfc_clear_attr (&attr);
1577 attr.flavor = FL_PROGRAM;
1578 attr.proc = PROC_UNKNOWN;
1579 attr.subroutine = 1;
1580 attr.access = ACCESS_PUBLIC;
1581 attr.is_main_program = 1;
1582 main_program->attr = attr;
1583 main_program->declared_at = gfc_current_locus;
1584 ns->proc_name = main_program;
1585 gfc_commit_symbols ();
1589 /* Do whatever is necessary to accept the last statement. */
1592 accept_statement (gfc_statement st)
1600 case ST_IMPLICIT_NONE:
1601 gfc_set_implicit_none ();
1610 gfc_current_ns->proc_name = gfc_new_block;
1613 /* If the statement is the end of a block, lay down a special code
1614 that allows a branch to the end of the block from within the
1615 construct. IF and SELECT are treated differently from DO
1616 (where EXEC_NOP is added inside the loop) for two
1618 1. END DO has a meaning in the sense that after a GOTO to
1619 it, the loop counter must be increased.
1620 2. IF blocks and SELECT blocks can consist of multiple
1621 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1622 Putting the label before the END IF would make the jump
1623 from, say, the ELSE IF block to the END IF illegal. */
1627 case ST_END_CRITICAL:
1628 if (gfc_statement_label != NULL)
1630 new_st.op = EXEC_END_BLOCK;
1635 /* The end-of-program unit statements do not get the special
1636 marker and require a statement of some sort if they are a
1639 case ST_END_PROGRAM:
1640 case ST_END_FUNCTION:
1641 case ST_END_SUBROUTINE:
1642 if (gfc_statement_label != NULL)
1644 new_st.op = EXEC_RETURN;
1649 new_st.op = EXEC_END_PROCEDURE;
1665 gfc_commit_symbols ();
1666 gfc_warning_check ();
1667 gfc_clear_new_st ();
1671 /* Undo anything tentative that has been built for the current
1675 reject_statement (void)
1677 /* Revert to the previous charlen chain. */
1678 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1679 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1681 gfc_free_equiv_until (gfc_current_ns->equiv, gfc_current_ns->old_equiv);
1682 gfc_current_ns->equiv = gfc_current_ns->old_equiv;
1684 gfc_new_block = NULL;
1685 gfc_undo_symbols ();
1686 gfc_clear_warning ();
1687 undo_new_statement ();
1691 /* Generic complaint about an out of order statement. We also do
1692 whatever is necessary to clean up. */
1695 unexpected_statement (gfc_statement st)
1697 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1699 reject_statement ();
1703 /* Given the next statement seen by the matcher, make sure that it is
1704 in proper order with the last. This subroutine is initialized by
1705 calling it with an argument of ST_NONE. If there is a problem, we
1706 issue an error and return FAILURE. Otherwise we return SUCCESS.
1708 Individual parsers need to verify that the statements seen are
1709 valid before calling here, i.e., ENTRY statements are not allowed in
1710 INTERFACE blocks. The following diagram is taken from the standard:
1712 +---------------------------------------+
1713 | program subroutine function module |
1714 +---------------------------------------+
1716 +---------------------------------------+
1718 +---------------------------------------+
1720 | +-----------+------------------+
1721 | | parameter | implicit |
1722 | +-----------+------------------+
1723 | format | | derived type |
1724 | entry | parameter | interface |
1725 | | data | specification |
1726 | | | statement func |
1727 | +-----------+------------------+
1728 | | data | executable |
1729 +--------+-----------+------------------+
1731 +---------------------------------------+
1732 | internal module/subprogram |
1733 +---------------------------------------+
1735 +---------------------------------------+
1744 ORDER_IMPLICIT_NONE,
1752 enum state_order state;
1753 gfc_statement last_statement;
1759 verify_st_order (st_state *p, gfc_statement st, bool silent)
1765 p->state = ORDER_START;
1769 if (p->state > ORDER_USE)
1771 p->state = ORDER_USE;
1775 if (p->state > ORDER_IMPORT)
1777 p->state = ORDER_IMPORT;
1780 case ST_IMPLICIT_NONE:
1781 if (p->state > ORDER_IMPLICIT_NONE)
1784 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1785 statement disqualifies a USE but not an IMPLICIT NONE.
1786 Duplicate IMPLICIT NONEs are caught when the implicit types
1789 p->state = ORDER_IMPLICIT_NONE;
1793 if (p->state > ORDER_IMPLICIT)
1795 p->state = ORDER_IMPLICIT;
1800 if (p->state < ORDER_IMPLICIT_NONE)
1801 p->state = ORDER_IMPLICIT_NONE;
1805 if (p->state >= ORDER_EXEC)
1807 if (p->state < ORDER_IMPLICIT)
1808 p->state = ORDER_IMPLICIT;
1812 if (p->state < ORDER_SPEC)
1813 p->state = ORDER_SPEC;
1818 case ST_DERIVED_DECL:
1820 if (p->state >= ORDER_EXEC)
1822 if (p->state < ORDER_SPEC)
1823 p->state = ORDER_SPEC;
1828 if (p->state < ORDER_EXEC)
1829 p->state = ORDER_EXEC;
1833 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1834 gfc_ascii_statement (st));
1837 /* All is well, record the statement in case we need it next time. */
1838 p->where = gfc_current_locus;
1839 p->last_statement = st;
1844 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1845 gfc_ascii_statement (st),
1846 gfc_ascii_statement (p->last_statement), &p->where);
1852 /* Handle an unexpected end of file. This is a show-stopper... */
1854 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1857 unexpected_eof (void)
1861 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1863 /* Memory cleanup. Move to "second to last". */
1864 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1867 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1870 longjmp (eof_buf, 1);
1874 /* Parse the CONTAINS section of a derived type definition. */
1876 gfc_access gfc_typebound_default_access;
1879 parse_derived_contains (void)
1882 bool seen_private = false;
1883 bool seen_comps = false;
1884 bool error_flag = false;
1887 gcc_assert (gfc_current_state () == COMP_DERIVED);
1888 gcc_assert (gfc_current_block ());
1890 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1892 if (gfc_current_block ()->attr.sequence)
1893 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1894 " section at %C", gfc_current_block ()->name);
1895 if (gfc_current_block ()->attr.is_bind_c)
1896 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1897 " section at %C", gfc_current_block ()->name);
1899 accept_statement (ST_CONTAINS);
1900 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1902 gfc_typebound_default_access = ACCESS_PUBLIC;
1908 st = next_statement ();
1916 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1920 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1921 " procedure at %C") == FAILURE)
1924 accept_statement (ST_PROCEDURE);
1929 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1930 " at %C") == FAILURE)
1933 accept_statement (ST_GENERIC);
1938 if (gfc_notify_std (GFC_STD_F2003,
1939 "Fortran 2003: FINAL procedure declaration"
1940 " at %C") == FAILURE)
1943 accept_statement (ST_FINAL);
1951 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1952 "definition at %C with empty CONTAINS "
1953 "section") == FAILURE))
1956 /* ST_END_TYPE is accepted by parse_derived after return. */
1960 if (gfc_find_state (COMP_MODULE) == FAILURE)
1962 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1969 gfc_error ("PRIVATE statement at %C must precede procedure"
1976 gfc_error ("Duplicate PRIVATE statement at %C");
1980 accept_statement (ST_PRIVATE);
1981 gfc_typebound_default_access = ACCESS_PRIVATE;
1982 seen_private = true;
1986 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1990 gfc_error ("Already inside a CONTAINS block at %C");
1994 unexpected_statement (st);
2002 reject_statement ();
2006 gcc_assert (gfc_current_state () == COMP_DERIVED);
2012 /* Parse a derived type. */
2015 parse_derived (void)
2017 int compiling_type, seen_private, seen_sequence, seen_component;
2021 gfc_component *c, *lock_comp = NULL;
2023 accept_statement (ST_DERIVED_DECL);
2024 push_state (&s, COMP_DERIVED, gfc_new_block);
2026 gfc_new_block->component_access = ACCESS_PUBLIC;
2033 while (compiling_type)
2035 st = next_statement ();
2043 accept_statement (st);
2048 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
2055 if (!seen_component)
2056 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
2057 "definition at %C without components");
2059 accept_statement (ST_END_TYPE);
2063 if (gfc_find_state (COMP_MODULE) == FAILURE)
2065 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2072 gfc_error ("PRIVATE statement at %C must precede "
2073 "structure components");
2078 gfc_error ("Duplicate PRIVATE statement at %C");
2080 s.sym->component_access = ACCESS_PRIVATE;
2082 accept_statement (ST_PRIVATE);
2089 gfc_error ("SEQUENCE statement at %C must precede "
2090 "structure components");
2094 if (gfc_current_block ()->attr.sequence)
2095 gfc_warning ("SEQUENCE attribute at %C already specified in "
2100 gfc_error ("Duplicate SEQUENCE statement at %C");
2104 gfc_add_sequence (&gfc_current_block ()->attr,
2105 gfc_current_block ()->name, NULL);
2109 gfc_notify_std (GFC_STD_F2003,
2110 "Fortran 2003: CONTAINS block in derived type"
2111 " definition at %C");
2113 accept_statement (ST_CONTAINS);
2114 parse_derived_contains ();
2118 unexpected_statement (st);
2123 /* need to verify that all fields of the derived type are
2124 * interoperable with C if the type is declared to be bind(c)
2126 sym = gfc_current_block ();
2127 for (c = sym->components; c; c = c->next)
2129 bool coarray, lock_type, allocatable, pointer;
2130 coarray = lock_type = allocatable = pointer = false;
2132 /* Look for allocatable components. */
2133 if (c->attr.allocatable
2134 || (c->ts.type == BT_CLASS && c->attr.class_ok
2135 && CLASS_DATA (c)->attr.allocatable)
2136 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2139 sym->attr.alloc_comp = 1;
2142 /* Look for pointer components. */
2144 || (c->ts.type == BT_CLASS && c->attr.class_ok
2145 && CLASS_DATA (c)->attr.class_pointer)
2146 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2149 sym->attr.pointer_comp = 1;
2152 /* Look for procedure pointer components. */
2153 if (c->attr.proc_pointer
2154 || (c->ts.type == BT_DERIVED
2155 && c->ts.u.derived->attr.proc_pointer_comp))
2156 sym->attr.proc_pointer_comp = 1;
2158 /* Looking for coarray components. */
2159 if (c->attr.codimension
2160 || (c->ts.type == BT_CLASS && c->attr.class_ok
2161 && CLASS_DATA (c)->attr.codimension))
2164 sym->attr.coarray_comp = 1;
2167 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp)
2170 if (!pointer && !allocatable)
2171 sym->attr.coarray_comp = 1;
2174 /* Looking for lock_type components. */
2175 if ((c->ts.type == BT_DERIVED
2176 && c->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2177 && c->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
2178 || (c->ts.type == BT_CLASS && c->attr.class_ok
2179 && CLASS_DATA (c)->ts.u.derived->from_intmod
2180 == INTMOD_ISO_FORTRAN_ENV
2181 && CLASS_DATA (c)->ts.u.derived->intmod_sym_id
2182 == ISOFORTRAN_LOCK_TYPE)
2183 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.lock_comp
2184 && !allocatable && !pointer))
2188 sym->attr.lock_comp = 1;
2191 /* Check for F2008, C1302 - and recall that pointers may not be coarrays
2192 (5.3.14) and that subobjects of coarray are coarray themselves (2.4.7),
2193 unless there are nondirect [allocatable or pointer] components
2194 involved (cf. 1.3.33.1 and 1.3.33.3). */
2196 if (pointer && !coarray && lock_type)
2197 gfc_error ("Component %s at %L of type LOCK_TYPE must have a "
2198 "codimension or be a subcomponent of a coarray, "
2199 "which is not possible as the component has the "
2200 "pointer attribute", c->name, &c->loc);
2201 else if (pointer && !coarray && c->ts.type == BT_DERIVED
2202 && c->ts.u.derived->attr.lock_comp)
2203 gfc_error ("Pointer component %s at %L has a noncoarray subcomponent "
2204 "of type LOCK_TYPE, which must have a codimension or be a "
2205 "subcomponent of a coarray", c->name, &c->loc);
2207 if (lock_type && allocatable && !coarray)
2208 gfc_error ("Allocatable component %s at %L of type LOCK_TYPE must have "
2209 "a codimension", c->name, &c->loc);
2210 else if (lock_type && allocatable && c->ts.type == BT_DERIVED
2211 && c->ts.u.derived->attr.lock_comp)
2212 gfc_error ("Allocatable component %s at %L must have a codimension as "
2213 "it has a noncoarray subcomponent of type LOCK_TYPE",
2216 if (sym->attr.coarray_comp && !coarray && lock_type)
2217 gfc_error ("Noncoarray component %s at %L of type LOCK_TYPE or with "
2218 "subcomponent of type LOCK_TYPE must have a codimension or "
2219 "be a subcomponent of a coarray. (Variables of type %s may "
2220 "not have a codimension as already a coarray "
2221 "subcomponent exists)", c->name, &c->loc, sym->name);
2223 if (sym->attr.lock_comp && coarray && !lock_type)
2224 gfc_error ("Noncoarray component %s at %L of type LOCK_TYPE or with "
2225 "subcomponent of type LOCK_TYPE must have a codimension or "
2226 "be a subcomponent of a coarray. (Variables of type %s may "
2227 "not have a codimension as %s at %L has a codimension or a "
2228 "coarray subcomponent)", lock_comp->name, &lock_comp->loc,
2229 sym->name, c->name, &c->loc);
2231 /* Look for private components. */
2232 if (sym->component_access == ACCESS_PRIVATE
2233 || c->attr.access == ACCESS_PRIVATE
2234 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2235 sym->attr.private_comp = 1;
2238 if (!seen_component)
2239 sym->attr.zero_comp = 1;
2245 /* Parse an ENUM. */
2253 int seen_enumerator = 0;
2255 push_state (&s, COMP_ENUM, gfc_new_block);
2259 while (compiling_enum)
2261 st = next_statement ();
2269 seen_enumerator = 1;
2270 accept_statement (st);
2275 if (!seen_enumerator)
2276 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2277 accept_statement (st);
2281 gfc_free_enum_history ();
2282 unexpected_statement (st);
2290 /* Parse an interface. We must be able to deal with the possibility
2291 of recursive interfaces. The parse_spec() subroutine is mutually
2292 recursive with parse_interface(). */
2294 static gfc_statement parse_spec (gfc_statement);
2297 parse_interface (void)
2299 gfc_compile_state new_state = COMP_NONE, current_state;
2300 gfc_symbol *prog_unit, *sym;
2301 gfc_interface_info save;
2302 gfc_state_data s1, s2;
2306 accept_statement (ST_INTERFACE);
2308 current_interface.ns = gfc_current_ns;
2309 save = current_interface;
2311 sym = (current_interface.type == INTERFACE_GENERIC
2312 || current_interface.type == INTERFACE_USER_OP)
2313 ? gfc_new_block : NULL;
2315 push_state (&s1, COMP_INTERFACE, sym);
2316 current_state = COMP_NONE;
2319 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2321 st = next_statement ();
2329 if (st == ST_SUBROUTINE)
2330 new_state = COMP_SUBROUTINE;
2331 else if (st == ST_FUNCTION)
2332 new_state = COMP_FUNCTION;
2333 if (gfc_new_block->attr.pointer)
2335 gfc_new_block->attr.pointer = 0;
2336 gfc_new_block->attr.proc_pointer = 1;
2338 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2339 gfc_new_block->formal, NULL) == FAILURE)
2341 reject_statement ();
2342 gfc_free_namespace (gfc_current_ns);
2348 case ST_MODULE_PROC: /* The module procedure matcher makes
2349 sure the context is correct. */
2350 accept_statement (st);
2351 gfc_free_namespace (gfc_current_ns);
2354 case ST_END_INTERFACE:
2355 gfc_free_namespace (gfc_current_ns);
2356 gfc_current_ns = current_interface.ns;
2360 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2361 gfc_ascii_statement (st));
2362 reject_statement ();
2363 gfc_free_namespace (gfc_current_ns);
2368 /* Make sure that the generic name has the right attribute. */
2369 if (current_interface.type == INTERFACE_GENERIC
2370 && current_state == COMP_NONE)
2372 if (new_state == COMP_FUNCTION && sym)
2373 gfc_add_function (&sym->attr, sym->name, NULL);
2374 else if (new_state == COMP_SUBROUTINE && sym)
2375 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2377 current_state = new_state;
2380 if (current_interface.type == INTERFACE_ABSTRACT)
2382 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2383 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2384 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2385 "cannot be the same as an intrinsic type",
2386 gfc_new_block->name);
2389 push_state (&s2, new_state, gfc_new_block);
2390 accept_statement (st);
2391 prog_unit = gfc_new_block;
2392 prog_unit->formal_ns = gfc_current_ns;
2393 proc_locus = gfc_current_locus;
2396 /* Read data declaration statements. */
2397 st = parse_spec (ST_NONE);
2399 /* Since the interface block does not permit an IMPLICIT statement,
2400 the default type for the function or the result must be taken
2401 from the formal namespace. */
2402 if (new_state == COMP_FUNCTION)
2404 if (prog_unit->result == prog_unit
2405 && prog_unit->ts.type == BT_UNKNOWN)
2406 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2407 else if (prog_unit->result != prog_unit
2408 && prog_unit->result->ts.type == BT_UNKNOWN)
2409 gfc_set_default_type (prog_unit->result, 1,
2410 prog_unit->formal_ns);
2413 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2415 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2416 gfc_ascii_statement (st));
2417 reject_statement ();
2421 /* Add EXTERNAL attribute to function or subroutine. */
2422 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2423 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2425 current_interface = save;
2426 gfc_add_interface (prog_unit);
2429 if (current_interface.ns
2430 && current_interface.ns->proc_name
2431 && strcmp (current_interface.ns->proc_name->name,
2432 prog_unit->name) == 0)
2433 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2434 "enclosing procedure", prog_unit->name, &proc_locus);
2443 /* Associate function characteristics by going back to the function
2444 declaration and rematching the prefix. */
2447 match_deferred_characteristics (gfc_typespec * ts)
2450 match m = MATCH_ERROR;
2451 char name[GFC_MAX_SYMBOL_LEN + 1];
2453 loc = gfc_current_locus;
2455 gfc_current_locus = gfc_current_block ()->declared_at;
2458 gfc_buffer_error (1);
2459 m = gfc_match_prefix (ts);
2460 gfc_buffer_error (0);
2462 if (ts->type == BT_DERIVED)
2470 /* Only permit one go at the characteristic association. */
2474 /* Set the function locus correctly. If we have not found the
2475 function name, there is an error. */
2477 && gfc_match ("function% %n", name) == MATCH_YES
2478 && strcmp (name, gfc_current_block ()->name) == 0)
2480 gfc_current_block ()->declared_at = gfc_current_locus;
2481 gfc_commit_symbols ();
2486 gfc_undo_symbols ();
2489 gfc_current_locus =loc;
2494 /* Check specification-expressions in the function result of the currently
2495 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2496 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2497 scope are not yet parsed so this has to be delayed up to parse_spec. */
2500 check_function_result_typed (void)
2502 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2504 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2505 gcc_assert (ts->type != BT_UNKNOWN);
2507 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2508 /* TODO: Extend when KIND type parameters are implemented. */
2509 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2510 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2514 /* Parse a set of specification statements. Returns the statement
2515 that doesn't fit. */
2517 static gfc_statement
2518 parse_spec (gfc_statement st)
2521 bool function_result_typed = false;
2522 bool bad_characteristic = false;
2525 verify_st_order (&ss, ST_NONE, false);
2527 st = next_statement ();
2529 /* If we are not inside a function or don't have a result specified so far,
2530 do nothing special about it. */
2531 if (gfc_current_state () != COMP_FUNCTION)
2532 function_result_typed = true;
2535 gfc_symbol* proc = gfc_current_ns->proc_name;
2538 if (proc->result->ts.type == BT_UNKNOWN)
2539 function_result_typed = true;
2544 /* If we're inside a BLOCK construct, some statements are disallowed.
2545 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2546 or VALUE are also disallowed, but they don't have a particular ST_*
2547 key so we have to check for them individually in their matcher routine. */
2548 if (gfc_current_state () == COMP_BLOCK)
2552 case ST_IMPLICIT_NONE:
2555 case ST_EQUIVALENCE:
2556 case ST_STATEMENT_FUNCTION:
2557 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2558 gfc_ascii_statement (st));
2559 reject_statement ();
2566 /* If we find a statement that can not be followed by an IMPLICIT statement
2567 (and thus we can expect to see none any further), type the function result
2568 if it has not yet been typed. Be careful not to give the END statement
2569 to verify_st_order! */
2570 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2572 bool verify_now = false;
2574 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2579 verify_st_order (&dummyss, ST_NONE, false);
2580 verify_st_order (&dummyss, st, false);
2582 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2588 check_function_result_typed ();
2589 function_result_typed = true;
2598 case ST_IMPLICIT_NONE:
2600 if (!function_result_typed)
2602 check_function_result_typed ();
2603 function_result_typed = true;
2609 case ST_DATA: /* Not allowed in interfaces */
2610 if (gfc_current_state () == COMP_INTERFACE)
2620 case ST_DERIVED_DECL:
2623 if (verify_st_order (&ss, st, false) == FAILURE)
2625 reject_statement ();
2626 st = next_statement ();
2636 case ST_DERIVED_DECL:
2642 if (gfc_current_state () != COMP_MODULE)
2644 gfc_error ("%s statement must appear in a MODULE",
2645 gfc_ascii_statement (st));
2646 reject_statement ();
2650 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2652 gfc_error ("%s statement at %C follows another accessibility "
2653 "specification", gfc_ascii_statement (st));
2654 reject_statement ();
2658 gfc_current_ns->default_access = (st == ST_PUBLIC)
2659 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2663 case ST_STATEMENT_FUNCTION:
2664 if (gfc_current_state () == COMP_MODULE)
2666 unexpected_statement (st);
2674 accept_statement (st);
2675 st = next_statement ();
2679 accept_statement (st);
2681 st = next_statement ();
2684 case ST_GET_FCN_CHARACTERISTICS:
2685 /* This statement triggers the association of a function's result
2687 ts = &gfc_current_block ()->result->ts;
2688 if (match_deferred_characteristics (ts) != MATCH_YES)
2689 bad_characteristic = true;
2691 st = next_statement ();
2698 /* If match_deferred_characteristics failed, then there is an error. */
2699 if (bad_characteristic)
2701 ts = &gfc_current_block ()->result->ts;
2702 if (ts->type != BT_DERIVED)
2703 gfc_error ("Bad kind expression for function '%s' at %L",
2704 gfc_current_block ()->name,
2705 &gfc_current_block ()->declared_at);
2707 gfc_error ("The type for function '%s' at %L is not accessible",
2708 gfc_current_block ()->name,
2709 &gfc_current_block ()->declared_at);
2711 gfc_current_block ()->ts.kind = 0;
2712 /* Keep the derived type; if it's bad, it will be discovered later. */
2713 if (!(ts->type == BT_DERIVED && ts->u.derived))
2714 ts->type = BT_UNKNOWN;
2721 /* Parse a WHERE block, (not a simple WHERE statement). */
2724 parse_where_block (void)
2726 int seen_empty_else;
2731 accept_statement (ST_WHERE_BLOCK);
2732 top = gfc_state_stack->tail;
2734 push_state (&s, COMP_WHERE, gfc_new_block);
2736 d = add_statement ();
2737 d->expr1 = top->expr1;
2743 seen_empty_else = 0;
2747 st = next_statement ();
2753 case ST_WHERE_BLOCK:
2754 parse_where_block ();
2759 accept_statement (st);
2763 if (seen_empty_else)
2765 gfc_error ("ELSEWHERE statement at %C follows previous "
2766 "unmasked ELSEWHERE");
2770 if (new_st.expr1 == NULL)
2771 seen_empty_else = 1;
2773 d = new_level (gfc_state_stack->head);
2775 d->expr1 = new_st.expr1;
2777 accept_statement (st);
2782 accept_statement (st);
2786 gfc_error ("Unexpected %s statement in WHERE block at %C",
2787 gfc_ascii_statement (st));
2788 reject_statement ();
2792 while (st != ST_END_WHERE);
2798 /* Parse a FORALL block (not a simple FORALL statement). */
2801 parse_forall_block (void)
2807 accept_statement (ST_FORALL_BLOCK);
2808 top = gfc_state_stack->tail;
2810 push_state (&s, COMP_FORALL, gfc_new_block);
2812 d = add_statement ();
2813 d->op = EXEC_FORALL;
2818 st = next_statement ();
2823 case ST_POINTER_ASSIGNMENT:
2826 accept_statement (st);
2829 case ST_WHERE_BLOCK:
2830 parse_where_block ();
2833 case ST_FORALL_BLOCK:
2834 parse_forall_block ();
2838 accept_statement (st);
2845 gfc_error ("Unexpected %s statement in FORALL block at %C",
2846 gfc_ascii_statement (st));
2848 reject_statement ();
2852 while (st != ST_END_FORALL);
2858 static gfc_statement parse_executable (gfc_statement);
2860 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2863 parse_if_block (void)
2872 accept_statement (ST_IF_BLOCK);
2874 top = gfc_state_stack->tail;
2875 push_state (&s, COMP_IF, gfc_new_block);
2877 new_st.op = EXEC_IF;
2878 d = add_statement ();
2880 d->expr1 = top->expr1;
2886 st = parse_executable (ST_NONE);
2896 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2897 "statement at %L", &else_locus);
2899 reject_statement ();
2903 d = new_level (gfc_state_stack->head);
2905 d->expr1 = new_st.expr1;
2907 accept_statement (st);
2914 gfc_error ("Duplicate ELSE statements at %L and %C",
2916 reject_statement ();
2921 else_locus = gfc_current_locus;
2923 d = new_level (gfc_state_stack->head);
2926 accept_statement (st);
2934 unexpected_statement (st);
2938 while (st != ST_ENDIF);
2941 accept_statement (st);
2945 /* Parse a SELECT block. */
2948 parse_select_block (void)
2954 accept_statement (ST_SELECT_CASE);
2956 cp = gfc_state_stack->tail;
2957 push_state (&s, COMP_SELECT, gfc_new_block);
2959 /* Make sure that the next statement is a CASE or END SELECT. */
2962 st = next_statement ();
2965 if (st == ST_END_SELECT)
2967 /* Empty SELECT CASE is OK. */
2968 accept_statement (st);
2975 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2978 reject_statement ();
2981 /* At this point, we're got a nonempty select block. */
2982 cp = new_level (cp);
2985 accept_statement (st);
2989 st = parse_executable (ST_NONE);
2996 cp = new_level (gfc_state_stack->head);
2998 gfc_clear_new_st ();
3000 accept_statement (st);
3006 /* Can't have an executable statement because of
3007 parse_executable(). */
3009 unexpected_statement (st);
3013 while (st != ST_END_SELECT);
3016 accept_statement (st);
3020 /* Pop the current selector from the SELECT TYPE stack. */
3023 select_type_pop (void)
3025 gfc_select_type_stack *old = select_type_stack;
3026 select_type_stack = old->prev;
3031 /* Parse a SELECT TYPE construct (F03:R821). */
3034 parse_select_type_block (void)
3040 accept_statement (ST_SELECT_TYPE);
3042 cp = gfc_state_stack->tail;
3043 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
3045 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
3049 st = next_statement ();
3052 if (st == ST_END_SELECT)
3053 /* Empty SELECT CASE is OK. */
3055 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
3058 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
3059 "following SELECT TYPE at %C");
3061 reject_statement ();
3064 /* At this point, we're got a nonempty select block. */
3065 cp = new_level (cp);
3068 accept_statement (st);
3072 st = parse_executable (ST_NONE);
3080 cp = new_level (gfc_state_stack->head);
3082 gfc_clear_new_st ();
3084 accept_statement (st);
3090 /* Can't have an executable statement because of
3091 parse_executable(). */
3093 unexpected_statement (st);
3097 while (st != ST_END_SELECT);
3101 accept_statement (st);
3102 gfc_current_ns = gfc_current_ns->parent;
3107 /* Given a symbol, make sure it is not an iteration variable for a DO
3108 statement. This subroutine is called when the symbol is seen in a
3109 context that causes it to become redefined. If the symbol is an
3110 iterator, we generate an error message and return nonzero. */
3113 gfc_check_do_variable (gfc_symtree *st)
3117 for (s=gfc_state_stack; s; s = s->previous)
3118 if (s->do_variable == st)
3120 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3121 "loop beginning at %L", st->name, &s->head->loc);
3129 /* Checks to see if the current statement label closes an enddo.
3130 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3131 an error) if it incorrectly closes an ENDDO. */
3134 check_do_closure (void)
3138 if (gfc_statement_label == NULL)
3141 for (p = gfc_state_stack; p; p = p->previous)
3142 if (p->state == COMP_DO)
3146 return 0; /* No loops to close */
3148 if (p->ext.end_do_label == gfc_statement_label)
3150 if (p == gfc_state_stack)
3153 gfc_error ("End of nonblock DO statement at %C is within another block");
3157 /* At this point, the label doesn't terminate the innermost loop.
3158 Make sure it doesn't terminate another one. */
3159 for (; p; p = p->previous)
3160 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
3162 gfc_error ("End of nonblock DO statement at %C is interwoven "
3163 "with another DO loop");
3171 /* Parse a series of contained program units. */
3173 static void parse_progunit (gfc_statement);
3176 /* Parse a CRITICAL block. */
3179 parse_critical_block (void)
3185 s.ext.end_do_label = new_st.label1;
3187 accept_statement (ST_CRITICAL);
3188 top = gfc_state_stack->tail;
3190 push_state (&s, COMP_CRITICAL, gfc_new_block);
3192 d = add_statement ();
3193 d->op = EXEC_CRITICAL;
3198 st = parse_executable (ST_NONE);
3206 case ST_END_CRITICAL:
3207 if (s.ext.end_do_label != NULL
3208 && s.ext.end_do_label != gfc_statement_label)
3209 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3210 "match CRITIAL label");
3212 if (gfc_statement_label != NULL)
3214 new_st.op = EXEC_NOP;
3220 unexpected_statement (st);
3224 while (st != ST_END_CRITICAL);
3227 accept_statement (st);
3231 /* Set up the local namespace for a BLOCK construct. */
3234 gfc_build_block_ns (gfc_namespace *parent_ns)
3236 gfc_namespace* my_ns;
3237 static int numblock = 1;
3239 my_ns = gfc_get_namespace (parent_ns, 1);
3240 my_ns->construct_entities = 1;
3242 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3243 code generation (so it must not be NULL).
3244 We set its recursive argument if our container procedure is recursive, so
3245 that local variables are accordingly placed on the stack when it
3246 will be necessary. */
3248 my_ns->proc_name = gfc_new_block;
3252 char buffer[20]; /* Enough to hold "block@2147483648\n". */
3254 snprintf(buffer, sizeof(buffer), "block@%d", numblock++);
3255 gfc_get_symbol (buffer, my_ns, &my_ns->proc_name);
3256 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3257 my_ns->proc_name->name, NULL);
3258 gcc_assert (t == SUCCESS);
3259 gfc_commit_symbol (my_ns->proc_name);
3262 if (parent_ns->proc_name)
3263 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3269 /* Parse a BLOCK construct. */
3272 parse_block_construct (void)
3274 gfc_namespace* my_ns;
3277 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BLOCK construct at %C");
3279 my_ns = gfc_build_block_ns (gfc_current_ns);
3281 new_st.op = EXEC_BLOCK;
3282 new_st.ext.block.ns = my_ns;
3283 new_st.ext.block.assoc = NULL;
3284 accept_statement (ST_BLOCK);
3286 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3287 gfc_current_ns = my_ns;
3289 parse_progunit (ST_NONE);
3291 gfc_current_ns = gfc_current_ns->parent;
3296 /* Parse an ASSOCIATE construct. This is essentially a BLOCK construct
3297 behind the scenes with compiler-generated variables. */
3300 parse_associate (void)
3302 gfc_namespace* my_ns;
3305 gfc_association_list* a;
3307 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASSOCIATE construct at %C");
3309 my_ns = gfc_build_block_ns (gfc_current_ns);
3311 new_st.op = EXEC_BLOCK;
3312 new_st.ext.block.ns = my_ns;
3313 gcc_assert (new_st.ext.block.assoc);
3315 /* Add all associate-names as BLOCK variables. Creating them is enough
3316 for now, they'll get their values during trans-* phase. */
3317 gfc_current_ns = my_ns;
3318 for (a = new_st.ext.block.assoc; a; a = a->next)
3322 if (gfc_get_sym_tree (a->name, NULL, &a->st, false))
3326 sym->attr.flavor = FL_VARIABLE;
3328 sym->declared_at = a->where;
3329 gfc_set_sym_referenced (sym);
3331 /* Initialize the typespec. It is not available in all cases,
3332 however, as it may only be set on the target during resolution.
3333 Still, sometimes it helps to have it right now -- especially
3334 for parsing component references on the associate-name
3335 in case of assication to a derived-type. */
3336 sym->ts = a->target->ts;
3339 accept_statement (ST_ASSOCIATE);
3340 push_state (&s, COMP_ASSOCIATE, my_ns->proc_name);
3343 st = parse_executable (ST_NONE);
3350 accept_statement (st);
3351 my_ns->code = gfc_state_stack->head;
3355 unexpected_statement (st);
3359 gfc_current_ns = gfc_current_ns->parent;
3364 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3365 handled inside of parse_executable(), because they aren't really
3369 parse_do_block (void)
3376 s.ext.end_do_label = new_st.label1;
3378 if (new_st.ext.iterator != NULL)
3379 stree = new_st.ext.iterator->var->symtree;
3383 accept_statement (ST_DO);
3385 top = gfc_state_stack->tail;
3386 push_state (&s, COMP_DO, gfc_new_block);
3388 s.do_variable = stree;
3390 top->block = new_level (top);
3391 top->block->op = EXEC_DO;
3394 st = parse_executable (ST_NONE);
3402 if (s.ext.end_do_label != NULL
3403 && s.ext.end_do_label != gfc_statement_label)
3404 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3407 if (gfc_statement_label != NULL)
3409 new_st.op = EXEC_NOP;
3414 case ST_IMPLIED_ENDDO:
3415 /* If the do-stmt of this DO construct has a do-construct-name,
3416 the corresponding end-do must be an end-do-stmt (with a matching
3417 name, but in that case we must have seen ST_ENDDO first).
3418 We only complain about this in pedantic mode. */
3419 if (gfc_current_block () != NULL)
3420 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3421 &gfc_current_block()->declared_at);
3426 unexpected_statement (st);
3431 accept_statement (st);
3435 /* Parse the statements of OpenMP do/parallel do. */
3437 static gfc_statement
3438 parse_omp_do (gfc_statement omp_st)
3444 accept_statement (omp_st);
3446 cp = gfc_state_stack->tail;
3447 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3448 np = new_level (cp);
3454 st = next_statement ();
3457 else if (st == ST_DO)
3460 unexpected_statement (st);
3464 if (gfc_statement_label != NULL
3465 && gfc_state_stack->previous != NULL
3466 && gfc_state_stack->previous->state == COMP_DO
3467 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3475 there should be no !$OMP END DO. */
3477 return ST_IMPLIED_ENDDO;
3480 check_do_closure ();
3483 st = next_statement ();
3484 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3486 if (new_st.op == EXEC_OMP_END_NOWAIT)
3487 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3489 gcc_assert (new_st.op == EXEC_NOP);
3490 gfc_clear_new_st ();
3491 gfc_commit_symbols ();
3492 gfc_warning_check ();
3493 st = next_statement ();
3499 /* Parse the statements of OpenMP atomic directive. */
3501 static gfc_statement
3502 parse_omp_atomic (void)
3509 accept_statement (ST_OMP_ATOMIC);
3511 cp = gfc_state_stack->tail;
3512 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3513 np = new_level (cp);
3516 count = 1 + (cp->ext.omp_atomic == GFC_OMP_ATOMIC_CAPTURE);
3520 st = next_statement ();
3523 else if (st == ST_ASSIGNMENT)
3525 accept_statement (st);
3529 unexpected_statement (st);
3534 st = next_statement ();
3535 if (st == ST_OMP_END_ATOMIC)
3537 gfc_clear_new_st ();
3538 gfc_commit_symbols ();
3539 gfc_warning_check ();
3540 st = next_statement ();
3542 else if (cp->ext.omp_atomic == GFC_OMP_ATOMIC_CAPTURE)
3543 gfc_error ("Missing !$OMP END ATOMIC after !$OMP ATOMIC CAPTURE at %C");
3548 /* Parse the statements of an OpenMP structured block. */
3551 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3553 gfc_statement st, omp_end_st;
3557 accept_statement (omp_st);
3559 cp = gfc_state_stack->tail;
3560 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3561 np = new_level (cp);
3567 case ST_OMP_PARALLEL:
3568 omp_end_st = ST_OMP_END_PARALLEL;
3570 case ST_OMP_PARALLEL_SECTIONS:
3571 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3573 case ST_OMP_SECTIONS:
3574 omp_end_st = ST_OMP_END_SECTIONS;
3576 case ST_OMP_ORDERED:
3577 omp_end_st = ST_OMP_END_ORDERED;
3579 case ST_OMP_CRITICAL:
3580 omp_end_st = ST_OMP_END_CRITICAL;
3583 omp_end_st = ST_OMP_END_MASTER;
3586 omp_end_st = ST_OMP_END_SINGLE;
3589 omp_end_st = ST_OMP_END_TASK;
3591 case ST_OMP_WORKSHARE:
3592 omp_end_st = ST_OMP_END_WORKSHARE;
3594 case ST_OMP_PARALLEL_WORKSHARE:
3595 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3603 if (workshare_stmts_only)
3605 /* Inside of !$omp workshare, only
3608 where statements and constructs
3609 forall statements and constructs
3613 are allowed. For !$omp critical these
3614 restrictions apply recursively. */
3617 st = next_statement ();
3628 accept_statement (st);
3631 case ST_WHERE_BLOCK:
3632 parse_where_block ();
3635 case ST_FORALL_BLOCK:
3636 parse_forall_block ();
3639 case ST_OMP_PARALLEL:
3640 case ST_OMP_PARALLEL_SECTIONS:
3641 parse_omp_structured_block (st, false);
3644 case ST_OMP_PARALLEL_WORKSHARE:
3645 case ST_OMP_CRITICAL:
3646 parse_omp_structured_block (st, true);
3649 case ST_OMP_PARALLEL_DO:
3650 st = parse_omp_do (st);
3654 st = parse_omp_atomic ();
3665 st = next_statement ();
3669 st = parse_executable (ST_NONE);
3672 else if (st == ST_OMP_SECTION
3673 && (omp_st == ST_OMP_SECTIONS
3674 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3676 np = new_level (np);
3680 else if (st != omp_end_st)
3681 unexpected_statement (st);
3683 while (st != omp_end_st);
3687 case EXEC_OMP_END_NOWAIT:
3688 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3690 case EXEC_OMP_CRITICAL:
3691 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3692 || (new_st.ext.omp_name != NULL
3693 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3694 gfc_error ("Name after !$omp critical and !$omp end critical does "
3696 free (CONST_CAST (char *, new_st.ext.omp_name));
3698 case EXEC_OMP_END_SINGLE:
3699 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3700 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3701 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3702 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3710 gfc_clear_new_st ();
3711 gfc_commit_symbols ();
3712 gfc_warning_check ();
3717 /* Accept a series of executable statements. We return the first
3718 statement that doesn't fit to the caller. Any block statements are
3719 passed on to the correct handler, which usually passes the buck
3722 static gfc_statement
3723 parse_executable (gfc_statement st)
3728 st = next_statement ();
3732 close_flag = check_do_closure ();
3737 case ST_END_PROGRAM:
3740 case ST_END_FUNCTION:
3745 case ST_END_SUBROUTINE:
3750 case ST_SELECT_CASE:
3751 gfc_error ("%s statement at %C cannot terminate a non-block "
3752 "DO loop", gfc_ascii_statement (st));
3768 accept_statement (st);
3769 if (close_flag == 1)
3770 return ST_IMPLIED_ENDDO;
3774 parse_block_construct ();
3785 case ST_SELECT_CASE:
3786 parse_select_block ();
3789 case ST_SELECT_TYPE:
3790 parse_select_type_block();
3795 if (check_do_closure () == 1)
3796 return ST_IMPLIED_ENDDO;
3800 parse_critical_block ();
3803 case ST_WHERE_BLOCK:
3804 parse_where_block ();
3807 case ST_FORALL_BLOCK:
3808 parse_forall_block ();
3811 case ST_OMP_PARALLEL:
3812 case ST_OMP_PARALLEL_SECTIONS:
3813 case ST_OMP_SECTIONS:
3814 case ST_OMP_ORDERED:
3815 case ST_OMP_CRITICAL:
3819 parse_omp_structured_block (st, false);
3822 case ST_OMP_WORKSHARE:
3823 case ST_OMP_PARALLEL_WORKSHARE:
3824 parse_omp_structured_block (st, true);
3828 case ST_OMP_PARALLEL_DO:
3829 st = parse_omp_do (st);
3830 if (st == ST_IMPLIED_ENDDO)
3835 st = parse_omp_atomic ();
3842 st = next_statement ();
3847 /* Fix the symbols for sibling functions. These are incorrectly added to
3848 the child namespace as the parser didn't know about this procedure. */
3851 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3855 gfc_symbol *old_sym;
3857 sym->attr.referenced = 1;
3858 for (ns = siblings; ns; ns = ns->sibling)
3860 st = gfc_find_symtree (ns->sym_root, sym->name);
3862 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3863 goto fixup_contained;
3865 old_sym = st->n.sym;
3866 if (old_sym->ns == ns
3867 && !old_sym->attr.contained
3869 /* By 14.6.1.3, host association should be excluded
3870 for the following. */
3871 && !(old_sym->attr.external
3872 || (old_sym->ts.type != BT_UNKNOWN
3873 && !old_sym->attr.implicit_type)
3874 || old_sym->attr.flavor == FL_PARAMETER
3875 || old_sym->attr.use_assoc
3876 || old_sym->attr.in_common
3877 || old_sym->attr.in_equivalence
3878 || old_sym->attr.data
3879 || old_sym->attr.dummy
3880 || old_sym->attr.result
3881 || old_sym->attr.dimension
3882 || old_sym->attr.allocatable
3883 || old_sym->attr.intrinsic
3884 || old_sym->attr.generic
3885 || old_sym->attr.flavor == FL_NAMELIST
3886 || old_sym->attr.proc == PROC_ST_FUNCTION))
3888 /* Replace it with the symbol from the parent namespace. */
3892 gfc_release_symbol (old_sym);
3896 /* Do the same for any contained procedures. */
3897 gfc_fixup_sibling_symbols (sym, ns->contained);
3902 parse_contained (int module)
3904 gfc_namespace *ns, *parent_ns, *tmp;
3905 gfc_state_data s1, s2;
3909 int contains_statements = 0;
3912 push_state (&s1, COMP_CONTAINS, NULL);
3913 parent_ns = gfc_current_ns;
3917 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3919 gfc_current_ns->sibling = parent_ns->contained;
3920 parent_ns->contained = gfc_current_ns;
3923 /* Process the next available statement. We come here if we got an error
3924 and rejected the last statement. */
3925 st = next_statement ();
3934 contains_statements = 1;
3935 accept_statement (st);
3938 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3941 /* For internal procedures, create/update the symbol in the
3942 parent namespace. */
3946 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3947 gfc_error ("Contained procedure '%s' at %C is already "
3948 "ambiguous", gfc_new_block->name);
3951 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3952 &gfc_new_block->declared_at) ==
3955 if (st == ST_FUNCTION)
3956 gfc_add_function (&sym->attr, sym->name,
3957 &gfc_new_block->declared_at);
3959 gfc_add_subroutine (&sym->attr, sym->name,
3960 &gfc_new_block->declared_at);
3964 gfc_commit_symbols ();
3967 sym = gfc_new_block;
3969 /* Mark this as a contained function, so it isn't replaced
3970 by other module functions. */
3971 sym->attr.contained = 1;
3972 sym->attr.referenced = 1;
3974 /* Set implicit_pure so that it can be reset if any of the
3975 tests for purity fail. This is used for some optimisation
3976 during translation. */
3977 if (!sym->attr.pure)
3978 sym->attr.implicit_pure = 1;
3980 parse_progunit (ST_NONE);
3982 /* Fix up any sibling functions that refer to this one. */
3983 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3984 /* Or refer to any of its alternate entry points. */
3985 for (el = gfc_current_ns->entries; el; el = el->next)
3986 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3988 gfc_current_ns->code = s2.head;
3989 gfc_current_ns = parent_ns;
3994 /* These statements are associated with the end of the host unit. */
3995 case ST_END_FUNCTION:
3997 case ST_END_PROGRAM:
3998 case ST_END_SUBROUTINE:
3999 accept_statement (st);
4003 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
4004 gfc_ascii_statement (st));
4005 reject_statement ();
4011 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
4012 && st != ST_END_MODULE && st != ST_END_PROGRAM);
4014 /* The first namespace in the list is guaranteed to not have
4015 anything (worthwhile) in it. */
4016 tmp = gfc_current_ns;
4017 gfc_current_ns = parent_ns;
4018 if (seen_error && tmp->refs > 1)
4019 gfc_free_namespace (tmp);
4021 ns = gfc_current_ns->contained;
4022 gfc_current_ns->contained = ns->sibling;
4023 gfc_free_namespace (ns);
4026 if (!contains_statements)
4027 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
4028 "FUNCTION or SUBROUTINE statement at %C");
4032 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
4035 parse_progunit (gfc_statement st)
4040 st = parse_spec (st);
4047 /* This is not allowed within BLOCK! */
4048 if (gfc_current_state () != COMP_BLOCK)
4053 accept_statement (st);
4060 if (gfc_current_state () == COMP_FUNCTION)
4061 gfc_check_function_type (gfc_current_ns);
4066 st = parse_executable (st);
4074 /* This is not allowed within BLOCK! */
4075 if (gfc_current_state () != COMP_BLOCK)
4080 accept_statement (st);
4087 unexpected_statement (st);
4088 reject_statement ();
4089 st = next_statement ();
4095 for (p = gfc_state_stack; p; p = p->previous)
4096 if (p->state == COMP_CONTAINS)
4099 if (gfc_find_state (COMP_MODULE) == SUCCESS)
4104 gfc_error ("CONTAINS statement at %C is already in a contained "
4106 reject_statement ();
4107 st = next_statement ();
4111 parse_contained (0);
4114 gfc_current_ns->code = gfc_state_stack->head;
4118 /* Come here to complain about a global symbol already in use as
4122 gfc_global_used (gfc_gsymbol *sym, locus *where)
4127 where = &gfc_current_locus;
4137 case GSYM_SUBROUTINE:
4138 name = "SUBROUTINE";
4143 case GSYM_BLOCK_DATA:
4144 name = "BLOCK DATA";
4150 gfc_internal_error ("gfc_global_used(): Bad type");
4154 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
4155 sym->name, where, name, &sym->where);
4159 /* Parse a block data program unit. */
4162 parse_block_data (void)
4165 static locus blank_locus;
4166 static int blank_block=0;
4169 gfc_current_ns->proc_name = gfc_new_block;
4170 gfc_current_ns->is_block_data = 1;
4172 if (gfc_new_block == NULL)
4175 gfc_error ("Blank BLOCK DATA at %C conflicts with "
4176 "prior BLOCK DATA at %L", &blank_locus);
4180 blank_locus = gfc_current_locus;
4185 s = gfc_get_gsymbol (gfc_new_block->name);
4187 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
4188 gfc_global_used(s, NULL);
4191 s->type = GSYM_BLOCK_DATA;
4192 s->where = gfc_current_locus;
4197 st = parse_spec (ST_NONE);
4199 while (st != ST_END_BLOCK_DATA)
4201 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
4202 gfc_ascii_statement (st));
4203 reject_statement ();
4204 st = next_statement ();
4209 /* Parse a module subprogram. */
4217 s = gfc_get_gsymbol (gfc_new_block->name);
4218 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4219 gfc_global_used(s, NULL);
4222 s->type = GSYM_MODULE;
4223 s->where = gfc_current_locus;
4227 st = parse_spec (ST_NONE);
4236 parse_contained (1);
4240 accept_statement (st);
4244 gfc_error ("Unexpected %s statement in MODULE at %C",
4245 gfc_ascii_statement (st));
4247 reject_statement ();
4248 st = next_statement ();
4252 s->ns = gfc_current_ns;
4256 /* Add a procedure name to the global symbol table. */
4259 add_global_procedure (int sub)
4263 s = gfc_get_gsymbol(gfc_new_block->name);
4266 || (s->type != GSYM_UNKNOWN
4267 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4268 gfc_global_used(s, NULL);
4271 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4272 s->where = gfc_current_locus;
4274 s->ns = gfc_current_ns;
4279 /* Add a program to the global symbol table. */
4282 add_global_program (void)
4286 if (gfc_new_block == NULL)
4288 s = gfc_get_gsymbol (gfc_new_block->name);
4290 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4291 gfc_global_used(s, NULL);
4294 s->type = GSYM_PROGRAM;
4295 s->where = gfc_current_locus;
4297 s->ns = gfc_current_ns;
4302 /* Resolve all the program units when whole file scope option
4305 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4307 gfc_free_dt_list ();
4308 gfc_current_ns = gfc_global_ns_list;
4309 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4311 if (gfc_current_ns->proc_name
4312 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4313 continue; /* Already resolved. */
4315 if (gfc_current_ns->proc_name)
4316 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4317 gfc_resolve (gfc_current_ns);
4318 gfc_current_ns->derived_types = gfc_derived_types;
4319 gfc_derived_types = NULL;
4325 clean_up_modules (gfc_gsymbol *gsym)
4330 clean_up_modules (gsym->left);
4331 clean_up_modules (gsym->right);
4333 if (gsym->type != GSYM_MODULE || !gsym->ns)
4336 gfc_current_ns = gsym->ns;
4337 gfc_derived_types = gfc_current_ns->derived_types;
4344 /* Translate all the program units when whole file scope option
4345 is active. This could be in a different order to resolution if
4346 there are forward references in the file. */
4348 translate_all_program_units (gfc_namespace *gfc_global_ns_list,
4353 gfc_current_ns = gfc_global_ns_list;
4354 gfc_get_errors (NULL, &errors);
4356 /* If the main program is in the translation unit and we have
4357 -fcoarray=libs, generate the static variables. */
4358 if (gfc_option.coarray == GFC_FCOARRAY_LIB && main_in_tu)
4359 gfc_init_coarray_decl (true);
4361 /* We first translate all modules to make sure that later parts
4362 of the program can use the decl. Then we translate the nonmodules. */
4364 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4366 if (!gfc_current_ns->proc_name
4367 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4370 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4371 gfc_derived_types = gfc_current_ns->derived_types;
4372 gfc_generate_module_code (gfc_current_ns);
4373 gfc_current_ns->translated = 1;
4376 gfc_current_ns = gfc_global_ns_list;
4377 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4379 if (gfc_current_ns->proc_name
4380 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4383 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4384 gfc_derived_types = gfc_current_ns->derived_types;
4385 gfc_generate_code (gfc_current_ns);
4386 gfc_current_ns->translated = 1;
4389 /* Clean up all the namespaces after translation. */
4390 gfc_current_ns = gfc_global_ns_list;
4391 for (;gfc_current_ns;)
4395 if (gfc_current_ns->proc_name
4396 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4398 gfc_current_ns = gfc_current_ns->sibling;
4402 ns = gfc_current_ns->sibling;
4403 gfc_derived_types = gfc_current_ns->derived_types;
4405 gfc_current_ns = ns;
4408 clean_up_modules (gfc_gsym_root);
4412 /* Top level parser. */
4415 gfc_parse_file (void)
4417 int seen_program, errors_before, errors;
4418 gfc_state_data top, s;
4421 gfc_namespace *next;
4423 gfc_start_source_files ();
4425 top.state = COMP_NONE;
4427 top.previous = NULL;
4428 top.head = top.tail = NULL;
4429 top.do_variable = NULL;
4431 gfc_state_stack = ⊤
4433 gfc_clear_new_st ();
4435 gfc_statement_label = NULL;
4437 if (setjmp (eof_buf))
4438 return FAILURE; /* Come here on unexpected EOF */
4440 /* Prepare the global namespace that will contain the
4442 gfc_global_ns_list = next = NULL;
4446 /* Exit early for empty files. */
4452 st = next_statement ();
4461 goto duplicate_main;
4463 prog_locus = gfc_current_locus;
4465 push_state (&s, COMP_PROGRAM, gfc_new_block);
4466 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4467 accept_statement (st);
4468 add_global_program ();
4469 parse_progunit (ST_NONE);
4470 if (gfc_option.flag_whole_file)
4475 add_global_procedure (1);
4476 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4477 accept_statement (st);
4478 parse_progunit (ST_NONE);
4479 if (gfc_option.flag_whole_file)
4484 add_global_procedure (0);
4485 push_state (&s, COMP_FUNCTION, gfc_new_block);
4486 accept_statement (st);
4487 parse_progunit (ST_NONE);
4488 if (gfc_option.flag_whole_file)
4493 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4494 accept_statement (st);
4495 parse_block_data ();
4499 push_state (&s, COMP_MODULE, gfc_new_block);
4500 accept_statement (st);
4502 gfc_get_errors (NULL, &errors_before);
4506 /* Anything else starts a nameless main program block. */
4509 goto duplicate_main;
4511 prog_locus = gfc_current_locus;
4513 push_state (&s, COMP_PROGRAM, gfc_new_block);
4514 main_program_symbol (gfc_current_ns, "MAIN__");
4515 parse_progunit (st);
4516 if (gfc_option.flag_whole_file)
4521 /* Handle the non-program units. */
4522 gfc_current_ns->code = s.head;
4524 gfc_resolve (gfc_current_ns);
4526 /* Dump the parse tree if requested. */
4527 if (gfc_option.dump_fortran_original)
4528 gfc_dump_parse_tree (gfc_current_ns, stdout);
4530 gfc_get_errors (NULL, &errors);
4531 if (s.state == COMP_MODULE)
4533 gfc_dump_module (s.sym->name, errors_before == errors);
4534 if (!gfc_option.flag_whole_file)
4537 gfc_generate_module_code (gfc_current_ns);
4543 gfc_current_ns->derived_types = gfc_derived_types;
4544 gfc_derived_types = NULL;
4551 gfc_generate_code (gfc_current_ns);
4559 /* The main program and non-contained procedures are put
4560 in the global namespace list, so that they can be processed
4561 later and all their interfaces resolved. */
4562 gfc_current_ns->code = s.head;
4565 for (; next->sibling; next = next->sibling)
4567 next->sibling = gfc_current_ns;
4570 gfc_global_ns_list = gfc_current_ns;
4572 next = gfc_current_ns;
4579 if (!gfc_option.flag_whole_file)
4582 /* Do the resolution. */
4583 resolve_all_program_units (gfc_global_ns_list);
4585 /* Do the parse tree dump. */
4587 = gfc_option.dump_fortran_original ? gfc_global_ns_list : NULL;
4589 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4590 if (!gfc_current_ns->proc_name
4591 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4593 gfc_dump_parse_tree (gfc_current_ns, stdout);
4594 fputs ("------------------------------------------\n\n", stdout);
4597 /* Do the translation. */
4598 translate_all_program_units (gfc_global_ns_list, seen_program);
4602 gfc_end_source_files ();
4606 /* If we see a duplicate main program, shut down. If the second
4607 instance is an implied main program, i.e. data decls or executable
4608 statements, we're in for lots of errors. */
4609 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4610 reject_statement ();