2 Copyright (C) 2000-2014 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
30 /* Current statement label. Zero means no statement label. Because new_st
31 can get wiped during statement matching, we have to keep it separate. */
33 gfc_st_label *gfc_statement_label;
35 static locus label_locus;
36 static jmp_buf eof_buf;
38 gfc_state_data *gfc_state_stack;
39 static bool last_was_use_stmt = false;
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 /* Load symbols from all USE statements encountered in this scoping unit. */
82 gfc_error_buf old_error;
84 gfc_push_error (&old_error);
88 gfc_pop_error (&old_error);
89 gfc_commit_symbols ();
91 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
92 gfc_current_ns->old_equiv = gfc_current_ns->equiv;
93 last_was_use_stmt = false;
97 /* Figure out what the next statement is, (mostly) regardless of
98 proper ordering. The do...while(0) is there to prevent if/else
101 #define match(keyword, subr, st) \
103 if (match_word (keyword, subr, &old_locus) == MATCH_YES) \
106 undo_new_statement (); \
110 /* This is a specialist version of decode_statement that is used
111 for the specification statements in a function, whose
112 characteristics are deferred into the specification statements.
113 eg.: INTEGER (king = mykind) foo ()
114 USE mymodule, ONLY mykind.....
115 The KIND parameter needs a return after USE or IMPORT, whereas
116 derived type declarations can occur anywhere, up the executable
117 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
118 out of the correct kind of specification statements. */
120 decode_specification_statement (void)
126 if (gfc_match_eos () == MATCH_YES)
129 old_locus = gfc_current_locus;
131 if (match_word ("use", gfc_match_use, &old_locus) == MATCH_YES)
133 last_was_use_stmt = true;
138 undo_new_statement ();
139 if (last_was_use_stmt)
143 match ("import", gfc_match_import, ST_IMPORT);
145 if (gfc_current_block ()->result->ts.type != BT_DERIVED)
148 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
149 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
150 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
152 /* General statement matching: Instead of testing every possible
153 statement, we eliminate most possibilities by peeking at the
156 c = gfc_peek_ascii_char ();
161 match ("abstract% interface", gfc_match_abstract_interface,
163 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
164 match ("asynchronous", gfc_match_asynchronous, ST_ATTR_DECL);
168 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
172 match ("codimension", gfc_match_codimension, ST_ATTR_DECL);
173 match ("contiguous", gfc_match_contiguous, ST_ATTR_DECL);
177 match ("data", gfc_match_data, ST_DATA);
178 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
182 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
183 match ("entry% ", gfc_match_entry, ST_ENTRY);
184 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
185 match ("external", gfc_match_external, ST_ATTR_DECL);
189 match ("format", gfc_match_format, ST_FORMAT);
196 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
197 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
198 match ("interface", gfc_match_interface, ST_INTERFACE);
199 match ("intent", gfc_match_intent, ST_ATTR_DECL);
200 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
207 match ("namelist", gfc_match_namelist, ST_NAMELIST);
211 match ("optional", gfc_match_optional, ST_ATTR_DECL);
215 match ("parameter", gfc_match_parameter, ST_PARAMETER);
216 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
217 if (gfc_match_private (&st) == MATCH_YES)
219 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
220 if (gfc_match_public (&st) == MATCH_YES)
222 match ("protected", gfc_match_protected, ST_ATTR_DECL);
229 match ("save", gfc_match_save, ST_ATTR_DECL);
233 match ("target", gfc_match_target, ST_ATTR_DECL);
234 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
241 match ("value", gfc_match_value, ST_ATTR_DECL);
242 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
249 /* This is not a specification statement. See if any of the matchers
250 has stored an error message of some sort. */
254 gfc_buffer_error (0);
255 gfc_current_locus = old_locus;
257 return ST_GET_FCN_CHARACTERISTICS;
261 /* This is the primary 'decode_statement'. */
263 decode_statement (void)
271 gfc_enforce_clean_symbol_state ();
273 gfc_clear_error (); /* Clear any pending errors. */
274 gfc_clear_warning (); /* Clear any pending warnings. */
276 gfc_matching_function = false;
278 if (gfc_match_eos () == MATCH_YES)
281 if (gfc_current_state () == COMP_FUNCTION
282 && gfc_current_block ()->result->ts.kind == -1)
283 return decode_specification_statement ();
285 old_locus = gfc_current_locus;
287 c = gfc_peek_ascii_char ();
291 if (match_word ("use", gfc_match_use, &old_locus) == MATCH_YES)
293 last_was_use_stmt = true;
297 undo_new_statement ();
300 if (last_was_use_stmt)
303 /* Try matching a data declaration or function declaration. The
304 input "REALFUNCTIONA(N)" can mean several things in different
305 contexts, so it (and its relatives) get special treatment. */
307 if (gfc_current_state () == COMP_NONE
308 || gfc_current_state () == COMP_INTERFACE
309 || gfc_current_state () == COMP_CONTAINS)
311 gfc_matching_function = true;
312 m = gfc_match_function_decl ();
315 else if (m == MATCH_ERROR)
319 gfc_current_locus = old_locus;
321 gfc_matching_function = false;
324 /* Match statements whose error messages are meant to be overwritten
325 by something better. */
327 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
328 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
329 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
331 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
332 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
334 /* Try to match a subroutine statement, which has the same optional
335 prefixes that functions can have. */
337 if (gfc_match_subroutine () == MATCH_YES)
338 return ST_SUBROUTINE;
340 gfc_current_locus = old_locus;
342 /* Check for the IF, DO, SELECT, WHERE, FORALL, CRITICAL, BLOCK and ASSOCIATE
343 statements, which might begin with a block label. The match functions for
344 these statements are unusual in that their keyword is not seen before
345 the matcher is called. */
347 if (gfc_match_if (&st) == MATCH_YES)
350 gfc_current_locus = old_locus;
352 if (gfc_match_where (&st) == MATCH_YES)
355 gfc_current_locus = old_locus;
357 if (gfc_match_forall (&st) == MATCH_YES)
360 gfc_current_locus = old_locus;
362 match (NULL, gfc_match_do, ST_DO);
363 match (NULL, gfc_match_block, ST_BLOCK);
364 match (NULL, gfc_match_associate, ST_ASSOCIATE);
365 match (NULL, gfc_match_critical, ST_CRITICAL);
366 match (NULL, gfc_match_select, ST_SELECT_CASE);
368 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
369 match (NULL, gfc_match_select_type, ST_SELECT_TYPE);
371 gfc_current_ns = gfc_current_ns->parent;
372 gfc_free_namespace (ns);
374 /* General statement matching: Instead of testing every possible
375 statement, we eliminate most possibilities by peeking at the
381 match ("abstract% interface", gfc_match_abstract_interface,
383 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
384 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
385 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
386 match ("asynchronous", gfc_match_asynchronous, ST_ATTR_DECL);
390 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
391 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
392 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
396 match ("call", gfc_match_call, ST_CALL);
397 match ("close", gfc_match_close, ST_CLOSE);
398 match ("continue", gfc_match_continue, ST_CONTINUE);
399 match ("contiguous", gfc_match_contiguous, ST_ATTR_DECL);
400 match ("cycle", gfc_match_cycle, ST_CYCLE);
401 match ("case", gfc_match_case, ST_CASE);
402 match ("common", gfc_match_common, ST_COMMON);
403 match ("contains", gfc_match_eos, ST_CONTAINS);
404 match ("class", gfc_match_class_is, ST_CLASS_IS);
405 match ("codimension", gfc_match_codimension, ST_ATTR_DECL);
409 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
410 match ("data", gfc_match_data, ST_DATA);
411 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
415 match ("end file", gfc_match_endfile, ST_END_FILE);
416 match ("exit", gfc_match_exit, ST_EXIT);
417 match ("else", gfc_match_else, ST_ELSE);
418 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
419 match ("else if", gfc_match_elseif, ST_ELSEIF);
420 match ("error stop", gfc_match_error_stop, ST_ERROR_STOP);
421 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
423 if (gfc_match_end (&st) == MATCH_YES)
426 match ("entry% ", gfc_match_entry, ST_ENTRY);
427 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
428 match ("external", gfc_match_external, ST_ATTR_DECL);
432 match ("final", gfc_match_final_decl, ST_FINAL);
433 match ("flush", gfc_match_flush, ST_FLUSH);
434 match ("format", gfc_match_format, ST_FORMAT);
438 match ("generic", gfc_match_generic, ST_GENERIC);
439 match ("go to", gfc_match_goto, ST_GOTO);
443 match ("inquire", gfc_match_inquire, ST_INQUIRE);
444 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
445 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
446 match ("import", gfc_match_import, ST_IMPORT);
447 match ("interface", gfc_match_interface, ST_INTERFACE);
448 match ("intent", gfc_match_intent, ST_ATTR_DECL);
449 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
453 match ("lock", gfc_match_lock, ST_LOCK);
457 match ("module% procedure", gfc_match_modproc, ST_MODULE_PROC);
458 match ("module", gfc_match_module, ST_MODULE);
462 match ("nullify", gfc_match_nullify, ST_NULLIFY);
463 match ("namelist", gfc_match_namelist, ST_NAMELIST);
467 match ("open", gfc_match_open, ST_OPEN);
468 match ("optional", gfc_match_optional, ST_ATTR_DECL);
472 match ("print", gfc_match_print, ST_WRITE);
473 match ("parameter", gfc_match_parameter, ST_PARAMETER);
474 match ("pause", gfc_match_pause, ST_PAUSE);
475 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
476 if (gfc_match_private (&st) == MATCH_YES)
478 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
479 match ("program", gfc_match_program, ST_PROGRAM);
480 if (gfc_match_public (&st) == MATCH_YES)
482 match ("protected", gfc_match_protected, ST_ATTR_DECL);
486 match ("read", gfc_match_read, ST_READ);
487 match ("return", gfc_match_return, ST_RETURN);
488 match ("rewind", gfc_match_rewind, ST_REWIND);
492 match ("sequence", gfc_match_eos, ST_SEQUENCE);
493 match ("stop", gfc_match_stop, ST_STOP);
494 match ("save", gfc_match_save, ST_ATTR_DECL);
495 match ("sync all", gfc_match_sync_all, ST_SYNC_ALL);
496 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
497 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
501 match ("target", gfc_match_target, ST_ATTR_DECL);
502 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
503 match ("type is", gfc_match_type_is, ST_TYPE_IS);
507 match ("unlock", gfc_match_unlock, ST_UNLOCK);
511 match ("value", gfc_match_value, ST_ATTR_DECL);
512 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
516 match ("wait", gfc_match_wait, ST_WAIT);
517 match ("write", gfc_match_write, ST_WRITE);
521 /* All else has failed, so give up. See if any of the matchers has
522 stored an error message of some sort. */
524 if (gfc_error_check () == 0)
525 gfc_error_now ("Unclassifiable statement at %C");
529 gfc_error_recovery ();
535 decode_omp_directive (void)
540 gfc_enforce_clean_symbol_state ();
542 gfc_clear_error (); /* Clear any pending errors. */
543 gfc_clear_warning (); /* Clear any pending warnings. */
547 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
548 "or ELEMENTAL procedures");
549 gfc_error_recovery ();
553 gfc_unset_implicit_pure (NULL);
555 old_locus = gfc_current_locus;
557 /* General OpenMP directive matching: Instead of testing every possible
558 statement, we eliminate most possibilities by peeking at the
561 c = gfc_peek_ascii_char ();
566 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
569 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
572 match ("cancellation% point", gfc_match_omp_cancellation_point,
573 ST_OMP_CANCELLATION_POINT);
574 match ("cancel", gfc_match_omp_cancel, ST_OMP_CANCEL);
575 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
578 match ("declare reduction", gfc_match_omp_declare_reduction,
579 ST_OMP_DECLARE_REDUCTION);
580 match ("declare simd", gfc_match_omp_declare_simd,
581 ST_OMP_DECLARE_SIMD);
582 match ("do simd", gfc_match_omp_do_simd, ST_OMP_DO_SIMD);
583 match ("do", gfc_match_omp_do, ST_OMP_DO);
586 match ("end atomic", gfc_match_omp_eos, ST_OMP_END_ATOMIC);
587 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
588 match ("end do simd", gfc_match_omp_end_nowait, ST_OMP_END_DO_SIMD);
589 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
590 match ("end simd", gfc_match_omp_eos, ST_OMP_END_SIMD);
591 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
592 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
593 match ("end parallel do simd", gfc_match_omp_eos,
594 ST_OMP_END_PARALLEL_DO_SIMD);
595 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
596 match ("end parallel sections", gfc_match_omp_eos,
597 ST_OMP_END_PARALLEL_SECTIONS);
598 match ("end parallel workshare", gfc_match_omp_eos,
599 ST_OMP_END_PARALLEL_WORKSHARE);
600 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
601 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
602 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
603 match ("end taskgroup", gfc_match_omp_eos, ST_OMP_END_TASKGROUP);
604 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
605 match ("end workshare", gfc_match_omp_end_nowait,
606 ST_OMP_END_WORKSHARE);
609 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
612 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
615 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
618 match ("parallel do simd", gfc_match_omp_parallel_do_simd,
619 ST_OMP_PARALLEL_DO_SIMD);
620 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
621 match ("parallel sections", gfc_match_omp_parallel_sections,
622 ST_OMP_PARALLEL_SECTIONS);
623 match ("parallel workshare", gfc_match_omp_parallel_workshare,
624 ST_OMP_PARALLEL_WORKSHARE);
625 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
628 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
629 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
630 match ("simd", gfc_match_omp_simd, ST_OMP_SIMD);
631 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
634 match ("taskgroup", gfc_match_omp_taskgroup, ST_OMP_TASKGROUP);
635 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
636 match ("taskyield", gfc_match_omp_taskyield, ST_OMP_TASKYIELD);
637 match ("task", gfc_match_omp_task, ST_OMP_TASK);
638 match ("threadprivate", gfc_match_omp_threadprivate,
639 ST_OMP_THREADPRIVATE);
642 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
646 /* All else has failed, so give up. See if any of the matchers has
647 stored an error message of some sort. */
649 if (gfc_error_check () == 0)
650 gfc_error_now ("Unclassifiable OpenMP directive at %C");
654 gfc_error_recovery ();
660 decode_gcc_attribute (void)
664 gfc_enforce_clean_symbol_state ();
666 gfc_clear_error (); /* Clear any pending errors. */
667 gfc_clear_warning (); /* Clear any pending warnings. */
668 old_locus = gfc_current_locus;
670 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
672 /* All else has failed, so give up. See if any of the matchers has
673 stored an error message of some sort. */
675 if (gfc_error_check () == 0)
676 gfc_error_now ("Unclassifiable GCC directive at %C");
680 gfc_error_recovery ();
688 /* Get the next statement in free form source. */
697 at_bol = gfc_at_bol ();
698 gfc_gobble_whitespace ();
700 c = gfc_peek_ascii_char ();
706 /* Found a statement label? */
707 m = gfc_match_st_label (&gfc_statement_label);
709 d = gfc_peek_ascii_char ();
710 if (m != MATCH_YES || !gfc_is_whitespace (d))
712 gfc_match_small_literal_int (&i, &cnt);
715 gfc_error_now ("Too many digits in statement label at %C");
718 gfc_error_now ("Zero is not a valid statement label at %C");
721 c = gfc_next_ascii_char ();
724 if (!gfc_is_whitespace (c))
725 gfc_error_now ("Non-numeric character in statement label at %C");
731 label_locus = gfc_current_locus;
733 gfc_gobble_whitespace ();
735 if (at_bol && gfc_peek_ascii_char () == ';')
737 gfc_error_now ("Semicolon at %C needs to be preceded by "
739 gfc_next_ascii_char (); /* Eat up the semicolon. */
743 if (gfc_match_eos () == MATCH_YES)
745 gfc_warning_now ("Ignoring statement label in empty statement "
746 "at %L", &label_locus);
747 gfc_free_st_label (gfc_statement_label);
748 gfc_statement_label = NULL;
755 /* Comments have already been skipped by the time we get here,
756 except for GCC attributes and OpenMP directives. */
758 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
759 c = gfc_peek_ascii_char ();
765 c = gfc_next_ascii_char ();
766 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
767 gcc_assert (c == "gcc$"[i]);
769 gfc_gobble_whitespace ();
770 return decode_gcc_attribute ();
773 else if (c == '$' && gfc_option.gfc_flag_openmp)
777 c = gfc_next_ascii_char ();
778 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
779 gcc_assert (c == "$omp"[i]);
781 gcc_assert (c == ' ' || c == '\t');
782 gfc_gobble_whitespace ();
783 if (last_was_use_stmt)
785 return decode_omp_directive ();
791 if (at_bol && c == ';')
793 if (!(gfc_option.allow_std & GFC_STD_F2008))
794 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
796 gfc_next_ascii_char (); /* Eat up the semicolon. */
800 return decode_statement ();
804 /* Get the next statement in fixed-form source. */
809 int label, digit_flag, i;
814 return decode_statement ();
816 /* Skip past the current label field, parsing a statement label if
817 one is there. This is a weird number parser, since the number is
818 contained within five columns and can have any kind of embedded
819 spaces. We also check for characters that make the rest of the
825 for (i = 0; i < 5; i++)
827 c = gfc_next_char_literal (NONSTRING);
844 label = label * 10 + ((unsigned char) c - '0');
845 label_locus = gfc_current_locus;
849 /* Comments have already been skipped by the time we get
850 here, except for GCC attributes and OpenMP directives. */
853 c = gfc_next_char_literal (NONSTRING);
855 if (TOLOWER (c) == 'g')
857 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
858 gcc_assert (TOLOWER (c) == "gcc$"[i]);
860 return decode_gcc_attribute ();
862 else if (c == '$' && gfc_option.gfc_flag_openmp)
864 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
865 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
867 if (c != ' ' && c != '0')
869 gfc_buffer_error (0);
870 gfc_error ("Bad continuation line at %C");
873 if (last_was_use_stmt)
875 return decode_omp_directive ();
879 /* Comments have already been skipped by the time we get
880 here so don't bother checking for them. */
883 gfc_buffer_error (0);
884 gfc_error ("Non-numeric character in statement label at %C");
892 gfc_warning_now ("Zero is not a valid statement label at %C");
895 /* We've found a valid statement label. */
896 gfc_statement_label = gfc_get_st_label (label);
900 /* Since this line starts a statement, it cannot be a continuation
901 of a previous statement. If we see something here besides a
902 space or zero, it must be a bad continuation line. */
904 c = gfc_next_char_literal (NONSTRING);
908 if (c != ' ' && c != '0')
910 gfc_buffer_error (0);
911 gfc_error ("Bad continuation line at %C");
915 /* Now that we've taken care of the statement label columns, we have
916 to make sure that the first nonblank character is not a '!'. If
917 it is, the rest of the line is a comment. */
921 loc = gfc_current_locus;
922 c = gfc_next_char_literal (NONSTRING);
924 while (gfc_is_whitespace (c));
928 gfc_current_locus = loc;
933 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
934 else if (!(gfc_option.allow_std & GFC_STD_F2008))
935 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
940 if (gfc_match_eos () == MATCH_YES)
943 /* At this point, we've got a nonblank statement to parse. */
944 return decode_statement ();
948 gfc_warning_now ("Ignoring statement label in empty statement at %L",
951 gfc_current_locus.lb->truncated = 0;
957 /* Return the next non-ST_NONE statement to the caller. We also worry
958 about including files and the ends of include files at this stage. */
961 next_statement (void)
966 gfc_enforce_clean_symbol_state ();
968 gfc_new_block = NULL;
970 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
971 gfc_current_ns->old_equiv = gfc_current_ns->equiv;
974 gfc_statement_label = NULL;
975 gfc_buffer_error (1);
980 gfc_skip_comments ();
988 if (gfc_define_undef_line ())
991 old_locus = gfc_current_locus;
993 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
999 gfc_buffer_error (0);
1001 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
1003 gfc_free_st_label (gfc_statement_label);
1004 gfc_statement_label = NULL;
1005 gfc_current_locus = old_locus;
1009 check_statement_label (st);
1015 /****************************** Parser ***********************************/
1017 /* The parser subroutines are of type 'try' that fail if the file ends
1020 /* Macros that expand to case-labels for various classes of
1021 statements. Start with executable statements that directly do
1024 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
1025 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
1026 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
1027 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
1028 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
1029 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
1030 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
1031 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
1032 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT: case ST_OMP_TASKYIELD: \
1033 case ST_OMP_CANCEL: case ST_OMP_CANCELLATION_POINT: \
1034 case ST_ERROR_STOP: case ST_SYNC_ALL: case ST_SYNC_IMAGES: \
1035 case ST_SYNC_MEMORY: case ST_LOCK: case ST_UNLOCK
1037 /* Statements that mark other executable statements. */
1039 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: \
1040 case ST_IF_BLOCK: case ST_BLOCK: case ST_ASSOCIATE: \
1041 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_SELECT_TYPE: \
1042 case ST_OMP_PARALLEL: \
1043 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
1044 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
1045 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
1046 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
1047 case ST_OMP_TASK: case ST_OMP_TASKGROUP: case ST_OMP_SIMD: \
1048 case ST_OMP_DO_SIMD: case ST_OMP_PARALLEL_DO_SIMD: case ST_CRITICAL
1050 /* Declaration statements */
1052 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
1053 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
1054 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
1055 case ST_PROCEDURE: case ST_OMP_DECLARE_SIMD: case ST_OMP_DECLARE_REDUCTION
1057 /* Block end statements. Errors associated with interchanging these
1058 are detected in gfc_match_end(). */
1060 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
1061 case ST_END_PROGRAM: case ST_END_SUBROUTINE: \
1062 case ST_END_BLOCK: case ST_END_ASSOCIATE
1065 /* Push a new state onto the stack. */
1068 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
1070 p->state = new_state;
1071 p->previous = gfc_state_stack;
1073 p->head = p->tail = NULL;
1074 p->do_variable = NULL;
1076 /* If this the state of a construct like BLOCK, DO or IF, the corresponding
1077 construct statement was accepted right before pushing the state. Thus,
1078 the construct's gfc_code is available as tail of the parent state. */
1079 gcc_assert (gfc_state_stack);
1080 p->construct = gfc_state_stack->tail;
1082 gfc_state_stack = p;
1086 /* Pop the current state. */
1090 gfc_state_stack = gfc_state_stack->previous;
1094 /* Try to find the given state in the state stack. */
1097 gfc_find_state (gfc_compile_state state)
1101 for (p = gfc_state_stack; p; p = p->previous)
1102 if (p->state == state)
1105 return (p == NULL) ? false : true;
1109 /* Starts a new level in the statement list. */
1112 new_level (gfc_code *q)
1116 p = q->block = gfc_get_code (EXEC_NOP);
1118 gfc_state_stack->head = gfc_state_stack->tail = p;
1124 /* Add the current new_st code structure and adds it to the current
1125 program unit. As a side-effect, it zeroes the new_st. */
1128 add_statement (void)
1132 p = XCNEW (gfc_code);
1135 p->loc = gfc_current_locus;
1137 if (gfc_state_stack->head == NULL)
1138 gfc_state_stack->head = p;
1140 gfc_state_stack->tail->next = p;
1142 while (p->next != NULL)
1145 gfc_state_stack->tail = p;
1147 gfc_clear_new_st ();
1153 /* Frees everything associated with the current statement. */
1156 undo_new_statement (void)
1158 gfc_free_statements (new_st.block);
1159 gfc_free_statements (new_st.next);
1160 gfc_free_statement (&new_st);
1161 gfc_clear_new_st ();
1165 /* If the current statement has a statement label, make sure that it
1166 is allowed to, or should have one. */
1169 check_statement_label (gfc_statement st)
1173 if (gfc_statement_label == NULL)
1175 if (st == ST_FORMAT)
1176 gfc_error ("FORMAT statement at %L does not have a statement label",
1183 case ST_END_PROGRAM:
1184 case ST_END_FUNCTION:
1185 case ST_END_SUBROUTINE:
1189 case ST_END_CRITICAL:
1191 case ST_END_ASSOCIATE:
1194 if (st == ST_ENDDO || st == ST_CONTINUE)
1195 type = ST_LABEL_DO_TARGET;
1197 type = ST_LABEL_TARGET;
1201 type = ST_LABEL_FORMAT;
1204 /* Statement labels are not restricted from appearing on a
1205 particular line. However, there are plenty of situations
1206 where the resulting label can't be referenced. */
1209 type = ST_LABEL_BAD_TARGET;
1213 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1215 new_st.here = gfc_statement_label;
1219 /* Figures out what the enclosing program unit is. This will be a
1220 function, subroutine, program, block data or module. */
1223 gfc_enclosing_unit (gfc_compile_state * result)
1227 for (p = gfc_state_stack; p; p = p->previous)
1228 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1229 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1230 || p->state == COMP_PROGRAM)
1239 *result = COMP_PROGRAM;
1244 /* Translate a statement enum to a string. */
1247 gfc_ascii_statement (gfc_statement st)
1253 case ST_ARITHMETIC_IF:
1254 p = _("arithmetic IF");
1263 p = _("attribute declaration");
1299 p = _("data declaration");
1307 case ST_DERIVED_DECL:
1308 p = _("derived type declaration");
1322 case ST_END_ASSOCIATE:
1323 p = "END ASSOCIATE";
1328 case ST_END_BLOCK_DATA:
1329 p = "END BLOCK DATA";
1331 case ST_END_CRITICAL:
1343 case ST_END_FUNCTION:
1349 case ST_END_INTERFACE:
1350 p = "END INTERFACE";
1355 case ST_END_PROGRAM:
1361 case ST_END_SUBROUTINE:
1362 p = "END SUBROUTINE";
1373 case ST_EQUIVALENCE:
1385 case ST_FORALL_BLOCK: /* Fall through */
1407 case ST_IMPLICIT_NONE:
1408 p = "IMPLICIT NONE";
1410 case ST_IMPLIED_ENDDO:
1411 p = _("implied END DO");
1440 case ST_MODULE_PROC:
1441 p = "MODULE PROCEDURE";
1473 case ST_SYNC_IMAGES:
1476 case ST_SYNC_MEMORY:
1491 case ST_WHERE_BLOCK: /* Fall through */
1502 p = _("assignment");
1504 case ST_POINTER_ASSIGNMENT:
1505 p = _("pointer assignment");
1507 case ST_SELECT_CASE:
1510 case ST_SELECT_TYPE:
1525 case ST_STATEMENT_FUNCTION:
1526 p = "STATEMENT FUNCTION";
1528 case ST_LABEL_ASSIGNMENT:
1529 p = "LABEL ASSIGNMENT";
1532 p = "ENUM DEFINITION";
1535 p = "ENUMERATOR DEFINITION";
1543 case ST_OMP_BARRIER:
1544 p = "!$OMP BARRIER";
1549 case ST_OMP_CANCELLATION_POINT:
1550 p = "!$OMP CANCELLATION POINT";
1552 case ST_OMP_CRITICAL:
1553 p = "!$OMP CRITICAL";
1555 case ST_OMP_DECLARE_REDUCTION:
1556 p = "!$OMP DECLARE REDUCTION";
1558 case ST_OMP_DECLARE_SIMD:
1559 p = "!$OMP DECLARE SIMD";
1564 case ST_OMP_DO_SIMD:
1565 p = "!$OMP DO SIMD";
1567 case ST_OMP_END_ATOMIC:
1568 p = "!$OMP END ATOMIC";
1570 case ST_OMP_END_CRITICAL:
1571 p = "!$OMP END CRITICAL";
1576 case ST_OMP_END_DO_SIMD:
1577 p = "!$OMP END DO SIMD";
1579 case ST_OMP_END_SIMD:
1580 p = "!$OMP END SIMD";
1582 case ST_OMP_END_MASTER:
1583 p = "!$OMP END MASTER";
1585 case ST_OMP_END_ORDERED:
1586 p = "!$OMP END ORDERED";
1588 case ST_OMP_END_PARALLEL:
1589 p = "!$OMP END PARALLEL";
1591 case ST_OMP_END_PARALLEL_DO:
1592 p = "!$OMP END PARALLEL DO";
1594 case ST_OMP_END_PARALLEL_DO_SIMD:
1595 p = "!$OMP END PARALLEL DO SIMD";
1597 case ST_OMP_END_PARALLEL_SECTIONS:
1598 p = "!$OMP END PARALLEL SECTIONS";
1600 case ST_OMP_END_PARALLEL_WORKSHARE:
1601 p = "!$OMP END PARALLEL WORKSHARE";
1603 case ST_OMP_END_SECTIONS:
1604 p = "!$OMP END SECTIONS";
1606 case ST_OMP_END_SINGLE:
1607 p = "!$OMP END SINGLE";
1609 case ST_OMP_END_TASK:
1610 p = "!$OMP END TASK";
1612 case ST_OMP_END_TASKGROUP:
1613 p = "!$OMP END TASKGROUP";
1615 case ST_OMP_END_WORKSHARE:
1616 p = "!$OMP END WORKSHARE";
1624 case ST_OMP_ORDERED:
1625 p = "!$OMP ORDERED";
1627 case ST_OMP_PARALLEL:
1628 p = "!$OMP PARALLEL";
1630 case ST_OMP_PARALLEL_DO:
1631 p = "!$OMP PARALLEL DO";
1633 case ST_OMP_PARALLEL_DO_SIMD:
1634 p = "!$OMP PARALLEL DO SIMD";
1636 case ST_OMP_PARALLEL_SECTIONS:
1637 p = "!$OMP PARALLEL SECTIONS";
1639 case ST_OMP_PARALLEL_WORKSHARE:
1640 p = "!$OMP PARALLEL WORKSHARE";
1642 case ST_OMP_SECTIONS:
1643 p = "!$OMP SECTIONS";
1645 case ST_OMP_SECTION:
1646 p = "!$OMP SECTION";
1657 case ST_OMP_TASKGROUP:
1658 p = "!$OMP TASKGROUP";
1660 case ST_OMP_TASKWAIT:
1661 p = "!$OMP TASKWAIT";
1663 case ST_OMP_TASKYIELD:
1664 p = "!$OMP TASKYIELD";
1666 case ST_OMP_THREADPRIVATE:
1667 p = "!$OMP THREADPRIVATE";
1669 case ST_OMP_WORKSHARE:
1670 p = "!$OMP WORKSHARE";
1673 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1680 /* Create a symbol for the main program and assign it to ns->proc_name. */
1683 main_program_symbol (gfc_namespace *ns, const char *name)
1685 gfc_symbol *main_program;
1686 symbol_attribute attr;
1688 gfc_get_symbol (name, ns, &main_program);
1689 gfc_clear_attr (&attr);
1690 attr.flavor = FL_PROGRAM;
1691 attr.proc = PROC_UNKNOWN;
1692 attr.subroutine = 1;
1693 attr.access = ACCESS_PUBLIC;
1694 attr.is_main_program = 1;
1695 main_program->attr = attr;
1696 main_program->declared_at = gfc_current_locus;
1697 ns->proc_name = main_program;
1698 gfc_commit_symbols ();
1702 /* Do whatever is necessary to accept the last statement. */
1705 accept_statement (gfc_statement st)
1709 case ST_IMPLICIT_NONE:
1710 gfc_set_implicit_none ();
1719 gfc_current_ns->proc_name = gfc_new_block;
1722 /* If the statement is the end of a block, lay down a special code
1723 that allows a branch to the end of the block from within the
1724 construct. IF and SELECT are treated differently from DO
1725 (where EXEC_NOP is added inside the loop) for two
1727 1. END DO has a meaning in the sense that after a GOTO to
1728 it, the loop counter must be increased.
1729 2. IF blocks and SELECT blocks can consist of multiple
1730 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1731 Putting the label before the END IF would make the jump
1732 from, say, the ELSE IF block to the END IF illegal. */
1736 case ST_END_CRITICAL:
1737 if (gfc_statement_label != NULL)
1739 new_st.op = EXEC_END_NESTED_BLOCK;
1744 /* In the case of BLOCK and ASSOCIATE blocks, there cannot be more than
1745 one parallel block. Thus, we add the special code to the nested block
1746 itself, instead of the parent one. */
1748 case ST_END_ASSOCIATE:
1749 if (gfc_statement_label != NULL)
1751 new_st.op = EXEC_END_BLOCK;
1756 /* The end-of-program unit statements do not get the special
1757 marker and require a statement of some sort if they are a
1760 case ST_END_PROGRAM:
1761 case ST_END_FUNCTION:
1762 case ST_END_SUBROUTINE:
1763 if (gfc_statement_label != NULL)
1765 new_st.op = EXEC_RETURN;
1770 new_st.op = EXEC_END_PROCEDURE;
1786 gfc_commit_symbols ();
1787 gfc_warning_check ();
1788 gfc_clear_new_st ();
1792 /* Undo anything tentative that has been built for the current
1796 reject_statement (void)
1798 /* Revert to the previous charlen chain. */
1799 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1800 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1802 gfc_free_equiv_until (gfc_current_ns->equiv, gfc_current_ns->old_equiv);
1803 gfc_current_ns->equiv = gfc_current_ns->old_equiv;
1805 gfc_new_block = NULL;
1806 gfc_undo_symbols ();
1807 gfc_clear_warning ();
1808 undo_new_statement ();
1812 /* Generic complaint about an out of order statement. We also do
1813 whatever is necessary to clean up. */
1816 unexpected_statement (gfc_statement st)
1818 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1820 reject_statement ();
1824 /* Given the next statement seen by the matcher, make sure that it is
1825 in proper order with the last. This subroutine is initialized by
1826 calling it with an argument of ST_NONE. If there is a problem, we
1827 issue an error and return false. Otherwise we return true.
1829 Individual parsers need to verify that the statements seen are
1830 valid before calling here, i.e., ENTRY statements are not allowed in
1831 INTERFACE blocks. The following diagram is taken from the standard:
1833 +---------------------------------------+
1834 | program subroutine function module |
1835 +---------------------------------------+
1837 +---------------------------------------+
1839 +---------------------------------------+
1841 | +-----------+------------------+
1842 | | parameter | implicit |
1843 | +-----------+------------------+
1844 | format | | derived type |
1845 | entry | parameter | interface |
1846 | | data | specification |
1847 | | | statement func |
1848 | +-----------+------------------+
1849 | | data | executable |
1850 +--------+-----------+------------------+
1852 +---------------------------------------+
1853 | internal module/subprogram |
1854 +---------------------------------------+
1856 +---------------------------------------+
1865 ORDER_IMPLICIT_NONE,
1873 enum state_order state;
1874 gfc_statement last_statement;
1880 verify_st_order (st_state *p, gfc_statement st, bool silent)
1886 p->state = ORDER_START;
1890 if (p->state > ORDER_USE)
1892 p->state = ORDER_USE;
1896 if (p->state > ORDER_IMPORT)
1898 p->state = ORDER_IMPORT;
1901 case ST_IMPLICIT_NONE:
1902 if (p->state > ORDER_IMPLICIT_NONE)
1905 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1906 statement disqualifies a USE but not an IMPLICIT NONE.
1907 Duplicate IMPLICIT NONEs are caught when the implicit types
1910 p->state = ORDER_IMPLICIT_NONE;
1914 if (p->state > ORDER_IMPLICIT)
1916 p->state = ORDER_IMPLICIT;
1921 if (p->state < ORDER_IMPLICIT_NONE)
1922 p->state = ORDER_IMPLICIT_NONE;
1926 if (p->state >= ORDER_EXEC)
1928 if (p->state < ORDER_IMPLICIT)
1929 p->state = ORDER_IMPLICIT;
1933 if (p->state < ORDER_SPEC)
1934 p->state = ORDER_SPEC;
1939 case ST_DERIVED_DECL:
1941 if (p->state >= ORDER_EXEC)
1943 if (p->state < ORDER_SPEC)
1944 p->state = ORDER_SPEC;
1949 if (p->state < ORDER_EXEC)
1950 p->state = ORDER_EXEC;
1954 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1955 gfc_ascii_statement (st));
1958 /* All is well, record the statement in case we need it next time. */
1959 p->where = gfc_current_locus;
1960 p->last_statement = st;
1965 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1966 gfc_ascii_statement (st),
1967 gfc_ascii_statement (p->last_statement), &p->where);
1973 /* Handle an unexpected end of file. This is a show-stopper... */
1975 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1978 unexpected_eof (void)
1982 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1984 /* Memory cleanup. Move to "second to last". */
1985 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1988 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1991 longjmp (eof_buf, 1);
1995 /* Parse the CONTAINS section of a derived type definition. */
1997 gfc_access gfc_typebound_default_access;
2000 parse_derived_contains (void)
2003 bool seen_private = false;
2004 bool seen_comps = false;
2005 bool error_flag = false;
2008 gcc_assert (gfc_current_state () == COMP_DERIVED);
2009 gcc_assert (gfc_current_block ());
2011 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
2013 if (gfc_current_block ()->attr.sequence)
2014 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
2015 " section at %C", gfc_current_block ()->name);
2016 if (gfc_current_block ()->attr.is_bind_c)
2017 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
2018 " section at %C", gfc_current_block ()->name);
2020 accept_statement (ST_CONTAINS);
2021 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
2023 gfc_typebound_default_access = ACCESS_PUBLIC;
2029 st = next_statement ();
2037 gfc_error ("Components in TYPE at %C must precede CONTAINS");
2041 if (!gfc_notify_std (GFC_STD_F2003, "Type-bound procedure at %C"))
2044 accept_statement (ST_PROCEDURE);
2049 if (!gfc_notify_std (GFC_STD_F2003, "GENERIC binding at %C"))
2052 accept_statement (ST_GENERIC);
2057 if (!gfc_notify_std (GFC_STD_F2003, "FINAL procedure declaration"
2061 accept_statement (ST_FINAL);
2069 && (!gfc_notify_std(GFC_STD_F2008, "Derived type definition "
2070 "at %C with empty CONTAINS section")))
2073 /* ST_END_TYPE is accepted by parse_derived after return. */
2077 if (!gfc_find_state (COMP_MODULE))
2079 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2086 gfc_error ("PRIVATE statement at %C must precede procedure"
2093 gfc_error ("Duplicate PRIVATE statement at %C");
2097 accept_statement (ST_PRIVATE);
2098 gfc_typebound_default_access = ACCESS_PRIVATE;
2099 seen_private = true;
2103 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
2107 gfc_error ("Already inside a CONTAINS block at %C");
2111 unexpected_statement (st);
2119 reject_statement ();
2123 gcc_assert (gfc_current_state () == COMP_DERIVED);
2129 /* Parse a derived type. */
2132 parse_derived (void)
2134 int compiling_type, seen_private, seen_sequence, seen_component;
2138 gfc_component *c, *lock_comp = NULL;
2140 accept_statement (ST_DERIVED_DECL);
2141 push_state (&s, COMP_DERIVED, gfc_new_block);
2143 gfc_new_block->component_access = ACCESS_PUBLIC;
2150 while (compiling_type)
2152 st = next_statement ();
2160 accept_statement (st);
2165 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
2172 if (!seen_component)
2173 gfc_notify_std (GFC_STD_F2003, "Derived type "
2174 "definition at %C without components");
2176 accept_statement (ST_END_TYPE);
2180 if (!gfc_find_state (COMP_MODULE))
2182 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2189 gfc_error ("PRIVATE statement at %C must precede "
2190 "structure components");
2195 gfc_error ("Duplicate PRIVATE statement at %C");
2197 s.sym->component_access = ACCESS_PRIVATE;
2199 accept_statement (ST_PRIVATE);
2206 gfc_error ("SEQUENCE statement at %C must precede "
2207 "structure components");
2211 if (gfc_current_block ()->attr.sequence)
2212 gfc_warning ("SEQUENCE attribute at %C already specified in "
2217 gfc_error ("Duplicate SEQUENCE statement at %C");
2221 gfc_add_sequence (&gfc_current_block ()->attr,
2222 gfc_current_block ()->name, NULL);
2226 gfc_notify_std (GFC_STD_F2003,
2227 "CONTAINS block in derived type"
2228 " definition at %C");
2230 accept_statement (ST_CONTAINS);
2231 parse_derived_contains ();
2235 unexpected_statement (st);
2240 /* need to verify that all fields of the derived type are
2241 * interoperable with C if the type is declared to be bind(c)
2243 sym = gfc_current_block ();
2244 for (c = sym->components; c; c = c->next)
2246 bool coarray, lock_type, allocatable, pointer;
2247 coarray = lock_type = allocatable = pointer = false;
2249 /* Look for allocatable components. */
2250 if (c->attr.allocatable
2251 || (c->ts.type == BT_CLASS && c->attr.class_ok
2252 && CLASS_DATA (c)->attr.allocatable)
2253 || (c->ts.type == BT_DERIVED && !c->attr.pointer
2254 && c->ts.u.derived->attr.alloc_comp))
2257 sym->attr.alloc_comp = 1;
2260 /* Look for pointer components. */
2262 || (c->ts.type == BT_CLASS && c->attr.class_ok
2263 && CLASS_DATA (c)->attr.class_pointer)
2264 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2267 sym->attr.pointer_comp = 1;
2270 /* Look for procedure pointer components. */
2271 if (c->attr.proc_pointer
2272 || (c->ts.type == BT_DERIVED
2273 && c->ts.u.derived->attr.proc_pointer_comp))
2274 sym->attr.proc_pointer_comp = 1;
2276 /* Looking for coarray components. */
2277 if (c->attr.codimension
2278 || (c->ts.type == BT_CLASS && c->attr.class_ok
2279 && CLASS_DATA (c)->attr.codimension))
2282 sym->attr.coarray_comp = 1;
2285 if (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.coarray_comp
2286 && !c->attr.pointer)
2289 sym->attr.coarray_comp = 1;
2292 /* Looking for lock_type components. */
2293 if ((c->ts.type == BT_DERIVED
2294 && c->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2295 && c->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
2296 || (c->ts.type == BT_CLASS && c->attr.class_ok
2297 && CLASS_DATA (c)->ts.u.derived->from_intmod
2298 == INTMOD_ISO_FORTRAN_ENV
2299 && CLASS_DATA (c)->ts.u.derived->intmod_sym_id
2300 == ISOFORTRAN_LOCK_TYPE)
2301 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.lock_comp
2302 && !allocatable && !pointer))
2306 sym->attr.lock_comp = 1;
2309 /* Check for F2008, C1302 - and recall that pointers may not be coarrays
2310 (5.3.14) and that subobjects of coarray are coarray themselves (2.4.7),
2311 unless there are nondirect [allocatable or pointer] components
2312 involved (cf. 1.3.33.1 and 1.3.33.3). */
2314 if (pointer && !coarray && lock_type)
2315 gfc_error ("Component %s at %L of type LOCK_TYPE must have a "
2316 "codimension or be a subcomponent of a coarray, "
2317 "which is not possible as the component has the "
2318 "pointer attribute", c->name, &c->loc);
2319 else if (pointer && !coarray && c->ts.type == BT_DERIVED
2320 && c->ts.u.derived->attr.lock_comp)
2321 gfc_error ("Pointer component %s at %L has a noncoarray subcomponent "
2322 "of type LOCK_TYPE, which must have a codimension or be a "
2323 "subcomponent of a coarray", c->name, &c->loc);
2325 if (lock_type && allocatable && !coarray)
2326 gfc_error ("Allocatable component %s at %L of type LOCK_TYPE must have "
2327 "a codimension", c->name, &c->loc);
2328 else if (lock_type && allocatable && c->ts.type == BT_DERIVED
2329 && c->ts.u.derived->attr.lock_comp)
2330 gfc_error ("Allocatable component %s at %L must have a codimension as "
2331 "it has a noncoarray subcomponent of type LOCK_TYPE",
2334 if (sym->attr.coarray_comp && !coarray && lock_type)
2335 gfc_error ("Noncoarray component %s at %L of type LOCK_TYPE or with "
2336 "subcomponent of type LOCK_TYPE must have a codimension or "
2337 "be a subcomponent of a coarray. (Variables of type %s may "
2338 "not have a codimension as already a coarray "
2339 "subcomponent exists)", c->name, &c->loc, sym->name);
2341 if (sym->attr.lock_comp && coarray && !lock_type)
2342 gfc_error ("Noncoarray component %s at %L of type LOCK_TYPE or with "
2343 "subcomponent of type LOCK_TYPE must have a codimension or "
2344 "be a subcomponent of a coarray. (Variables of type %s may "
2345 "not have a codimension as %s at %L has a codimension or a "
2346 "coarray subcomponent)", lock_comp->name, &lock_comp->loc,
2347 sym->name, c->name, &c->loc);
2349 /* Look for private components. */
2350 if (sym->component_access == ACCESS_PRIVATE
2351 || c->attr.access == ACCESS_PRIVATE
2352 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2353 sym->attr.private_comp = 1;
2356 if (!seen_component)
2357 sym->attr.zero_comp = 1;
2363 /* Parse an ENUM. */
2371 int seen_enumerator = 0;
2373 push_state (&s, COMP_ENUM, gfc_new_block);
2377 while (compiling_enum)
2379 st = next_statement ();
2387 seen_enumerator = 1;
2388 accept_statement (st);
2393 if (!seen_enumerator)
2394 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2395 accept_statement (st);
2399 gfc_free_enum_history ();
2400 unexpected_statement (st);
2408 /* Parse an interface. We must be able to deal with the possibility
2409 of recursive interfaces. The parse_spec() subroutine is mutually
2410 recursive with parse_interface(). */
2412 static gfc_statement parse_spec (gfc_statement);
2415 parse_interface (void)
2417 gfc_compile_state new_state = COMP_NONE, current_state;
2418 gfc_symbol *prog_unit, *sym;
2419 gfc_interface_info save;
2420 gfc_state_data s1, s2;
2423 accept_statement (ST_INTERFACE);
2425 current_interface.ns = gfc_current_ns;
2426 save = current_interface;
2428 sym = (current_interface.type == INTERFACE_GENERIC
2429 || current_interface.type == INTERFACE_USER_OP)
2430 ? gfc_new_block : NULL;
2432 push_state (&s1, COMP_INTERFACE, sym);
2433 current_state = COMP_NONE;
2436 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2438 st = next_statement ();
2446 if (st == ST_SUBROUTINE)
2447 new_state = COMP_SUBROUTINE;
2448 else if (st == ST_FUNCTION)
2449 new_state = COMP_FUNCTION;
2450 if (gfc_new_block->attr.pointer)
2452 gfc_new_block->attr.pointer = 0;
2453 gfc_new_block->attr.proc_pointer = 1;
2455 if (!gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2456 gfc_new_block->formal, NULL))
2458 reject_statement ();
2459 gfc_free_namespace (gfc_current_ns);
2465 case ST_MODULE_PROC: /* The module procedure matcher makes
2466 sure the context is correct. */
2467 accept_statement (st);
2468 gfc_free_namespace (gfc_current_ns);
2471 case ST_END_INTERFACE:
2472 gfc_free_namespace (gfc_current_ns);
2473 gfc_current_ns = current_interface.ns;
2477 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2478 gfc_ascii_statement (st));
2479 reject_statement ();
2480 gfc_free_namespace (gfc_current_ns);
2485 /* Make sure that the generic name has the right attribute. */
2486 if (current_interface.type == INTERFACE_GENERIC
2487 && current_state == COMP_NONE)
2489 if (new_state == COMP_FUNCTION && sym)
2490 gfc_add_function (&sym->attr, sym->name, NULL);
2491 else if (new_state == COMP_SUBROUTINE && sym)
2492 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2494 current_state = new_state;
2497 if (current_interface.type == INTERFACE_ABSTRACT)
2499 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2500 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2501 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2502 "cannot be the same as an intrinsic type",
2503 gfc_new_block->name);
2506 push_state (&s2, new_state, gfc_new_block);
2507 accept_statement (st);
2508 prog_unit = gfc_new_block;
2509 prog_unit->formal_ns = gfc_current_ns;
2510 if (prog_unit == prog_unit->formal_ns->proc_name
2511 && prog_unit->ns != prog_unit->formal_ns)
2515 /* Read data declaration statements. */
2516 st = parse_spec (ST_NONE);
2518 /* Since the interface block does not permit an IMPLICIT statement,
2519 the default type for the function or the result must be taken
2520 from the formal namespace. */
2521 if (new_state == COMP_FUNCTION)
2523 if (prog_unit->result == prog_unit
2524 && prog_unit->ts.type == BT_UNKNOWN)
2525 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2526 else if (prog_unit->result != prog_unit
2527 && prog_unit->result->ts.type == BT_UNKNOWN)
2528 gfc_set_default_type (prog_unit->result, 1,
2529 prog_unit->formal_ns);
2532 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2534 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2535 gfc_ascii_statement (st));
2536 reject_statement ();
2540 /* Add EXTERNAL attribute to function or subroutine. */
2541 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2542 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2544 current_interface = save;
2545 gfc_add_interface (prog_unit);
2548 if (current_interface.ns
2549 && current_interface.ns->proc_name
2550 && strcmp (current_interface.ns->proc_name->name,
2551 prog_unit->name) == 0)
2552 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2553 "enclosing procedure", prog_unit->name,
2554 ¤t_interface.ns->proc_name->declared_at);
2563 /* Associate function characteristics by going back to the function
2564 declaration and rematching the prefix. */
2567 match_deferred_characteristics (gfc_typespec * ts)
2570 match m = MATCH_ERROR;
2571 char name[GFC_MAX_SYMBOL_LEN + 1];
2573 loc = gfc_current_locus;
2575 gfc_current_locus = gfc_current_block ()->declared_at;
2578 gfc_buffer_error (1);
2579 m = gfc_match_prefix (ts);
2580 gfc_buffer_error (0);
2582 if (ts->type == BT_DERIVED)
2590 /* Only permit one go at the characteristic association. */
2594 /* Set the function locus correctly. If we have not found the
2595 function name, there is an error. */
2597 && gfc_match ("function% %n", name) == MATCH_YES
2598 && strcmp (name, gfc_current_block ()->name) == 0)
2600 gfc_current_block ()->declared_at = gfc_current_locus;
2601 gfc_commit_symbols ();
2606 gfc_undo_symbols ();
2609 gfc_current_locus =loc;
2614 /* Check specification-expressions in the function result of the currently
2615 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2616 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2617 scope are not yet parsed so this has to be delayed up to parse_spec. */
2620 check_function_result_typed (void)
2622 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2624 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2625 gcc_assert (ts->type != BT_UNKNOWN);
2627 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2628 /* TODO: Extend when KIND type parameters are implemented. */
2629 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2630 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2634 /* Parse a set of specification statements. Returns the statement
2635 that doesn't fit. */
2637 static gfc_statement
2638 parse_spec (gfc_statement st)
2641 bool function_result_typed = false;
2642 bool bad_characteristic = false;
2645 verify_st_order (&ss, ST_NONE, false);
2647 st = next_statement ();
2649 /* If we are not inside a function or don't have a result specified so far,
2650 do nothing special about it. */
2651 if (gfc_current_state () != COMP_FUNCTION)
2652 function_result_typed = true;
2655 gfc_symbol* proc = gfc_current_ns->proc_name;
2658 if (proc->result->ts.type == BT_UNKNOWN)
2659 function_result_typed = true;
2664 /* If we're inside a BLOCK construct, some statements are disallowed.
2665 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2666 or VALUE are also disallowed, but they don't have a particular ST_*
2667 key so we have to check for them individually in their matcher routine. */
2668 if (gfc_current_state () == COMP_BLOCK)
2672 case ST_IMPLICIT_NONE:
2675 case ST_EQUIVALENCE:
2676 case ST_STATEMENT_FUNCTION:
2677 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2678 gfc_ascii_statement (st));
2679 reject_statement ();
2685 else if (gfc_current_state () == COMP_BLOCK_DATA)
2686 /* Fortran 2008, C1116. */
2693 case ST_END_BLOCK_DATA:
2695 case ST_EQUIVALENCE:
2698 case ST_IMPLICIT_NONE:
2699 case ST_DERIVED_DECL:
2707 gfc_error ("%s statement is not allowed inside of BLOCK DATA at %C",
2708 gfc_ascii_statement (st));
2709 reject_statement ();
2713 /* If we find a statement that can not be followed by an IMPLICIT statement
2714 (and thus we can expect to see none any further), type the function result
2715 if it has not yet been typed. Be careful not to give the END statement
2716 to verify_st_order! */
2717 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2719 bool verify_now = false;
2721 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2726 verify_st_order (&dummyss, ST_NONE, false);
2727 verify_st_order (&dummyss, st, false);
2729 if (!verify_st_order (&dummyss, ST_IMPLICIT, true))
2735 check_function_result_typed ();
2736 function_result_typed = true;
2745 case ST_IMPLICIT_NONE:
2747 if (!function_result_typed)
2749 check_function_result_typed ();
2750 function_result_typed = true;
2756 case ST_DATA: /* Not allowed in interfaces */
2757 if (gfc_current_state () == COMP_INTERFACE)
2767 case ST_DERIVED_DECL:
2770 if (!verify_st_order (&ss, st, false))
2772 reject_statement ();
2773 st = next_statement ();
2783 case ST_DERIVED_DECL:
2789 if (gfc_current_state () != COMP_MODULE)
2791 gfc_error ("%s statement must appear in a MODULE",
2792 gfc_ascii_statement (st));
2793 reject_statement ();
2797 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2799 gfc_error ("%s statement at %C follows another accessibility "
2800 "specification", gfc_ascii_statement (st));
2801 reject_statement ();
2805 gfc_current_ns->default_access = (st == ST_PUBLIC)
2806 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2810 case ST_STATEMENT_FUNCTION:
2811 if (gfc_current_state () == COMP_MODULE)
2813 unexpected_statement (st);
2821 accept_statement (st);
2822 st = next_statement ();
2826 accept_statement (st);
2828 st = next_statement ();
2831 case ST_GET_FCN_CHARACTERISTICS:
2832 /* This statement triggers the association of a function's result
2834 ts = &gfc_current_block ()->result->ts;
2835 if (match_deferred_characteristics (ts) != MATCH_YES)
2836 bad_characteristic = true;
2838 st = next_statement ();
2845 /* If match_deferred_characteristics failed, then there is an error. */
2846 if (bad_characteristic)
2848 ts = &gfc_current_block ()->result->ts;
2849 if (ts->type != BT_DERIVED)
2850 gfc_error ("Bad kind expression for function '%s' at %L",
2851 gfc_current_block ()->name,
2852 &gfc_current_block ()->declared_at);
2854 gfc_error ("The type for function '%s' at %L is not accessible",
2855 gfc_current_block ()->name,
2856 &gfc_current_block ()->declared_at);
2858 gfc_current_block ()->ts.kind = 0;
2859 /* Keep the derived type; if it's bad, it will be discovered later. */
2860 if (!(ts->type == BT_DERIVED && ts->u.derived))
2861 ts->type = BT_UNKNOWN;
2868 /* Parse a WHERE block, (not a simple WHERE statement). */
2871 parse_where_block (void)
2873 int seen_empty_else;
2878 accept_statement (ST_WHERE_BLOCK);
2879 top = gfc_state_stack->tail;
2881 push_state (&s, COMP_WHERE, gfc_new_block);
2883 d = add_statement ();
2884 d->expr1 = top->expr1;
2890 seen_empty_else = 0;
2894 st = next_statement ();
2900 case ST_WHERE_BLOCK:
2901 parse_where_block ();
2906 accept_statement (st);
2910 if (seen_empty_else)
2912 gfc_error ("ELSEWHERE statement at %C follows previous "
2913 "unmasked ELSEWHERE");
2914 reject_statement ();
2918 if (new_st.expr1 == NULL)
2919 seen_empty_else = 1;
2921 d = new_level (gfc_state_stack->head);
2923 d->expr1 = new_st.expr1;
2925 accept_statement (st);
2930 accept_statement (st);
2934 gfc_error ("Unexpected %s statement in WHERE block at %C",
2935 gfc_ascii_statement (st));
2936 reject_statement ();
2940 while (st != ST_END_WHERE);
2946 /* Parse a FORALL block (not a simple FORALL statement). */
2949 parse_forall_block (void)
2955 accept_statement (ST_FORALL_BLOCK);
2956 top = gfc_state_stack->tail;
2958 push_state (&s, COMP_FORALL, gfc_new_block);
2960 d = add_statement ();
2961 d->op = EXEC_FORALL;
2966 st = next_statement ();
2971 case ST_POINTER_ASSIGNMENT:
2974 accept_statement (st);
2977 case ST_WHERE_BLOCK:
2978 parse_where_block ();
2981 case ST_FORALL_BLOCK:
2982 parse_forall_block ();
2986 accept_statement (st);
2993 gfc_error ("Unexpected %s statement in FORALL block at %C",
2994 gfc_ascii_statement (st));
2996 reject_statement ();
3000 while (st != ST_END_FORALL);
3006 static gfc_statement parse_executable (gfc_statement);
3008 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
3011 parse_if_block (void)
3020 accept_statement (ST_IF_BLOCK);
3022 top = gfc_state_stack->tail;
3023 push_state (&s, COMP_IF, gfc_new_block);
3025 new_st.op = EXEC_IF;
3026 d = add_statement ();
3028 d->expr1 = top->expr1;
3034 st = parse_executable (ST_NONE);
3044 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
3045 "statement at %L", &else_locus);
3047 reject_statement ();
3051 d = new_level (gfc_state_stack->head);
3053 d->expr1 = new_st.expr1;
3055 accept_statement (st);
3062 gfc_error ("Duplicate ELSE statements at %L and %C",
3064 reject_statement ();
3069 else_locus = gfc_current_locus;
3071 d = new_level (gfc_state_stack->head);
3074 accept_statement (st);
3082 unexpected_statement (st);
3086 while (st != ST_ENDIF);
3089 accept_statement (st);
3093 /* Parse a SELECT block. */
3096 parse_select_block (void)
3102 accept_statement (ST_SELECT_CASE);
3104 cp = gfc_state_stack->tail;
3105 push_state (&s, COMP_SELECT, gfc_new_block);
3107 /* Make sure that the next statement is a CASE or END SELECT. */
3110 st = next_statement ();
3113 if (st == ST_END_SELECT)
3115 /* Empty SELECT CASE is OK. */
3116 accept_statement (st);
3123 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
3126 reject_statement ();
3129 /* At this point, we're got a nonempty select block. */
3130 cp = new_level (cp);
3133 accept_statement (st);
3137 st = parse_executable (ST_NONE);
3144 cp = new_level (gfc_state_stack->head);
3146 gfc_clear_new_st ();
3148 accept_statement (st);
3154 /* Can't have an executable statement because of
3155 parse_executable(). */
3157 unexpected_statement (st);
3161 while (st != ST_END_SELECT);
3164 accept_statement (st);
3168 /* Pop the current selector from the SELECT TYPE stack. */
3171 select_type_pop (void)
3173 gfc_select_type_stack *old = select_type_stack;
3174 select_type_stack = old->prev;
3179 /* Parse a SELECT TYPE construct (F03:R821). */
3182 parse_select_type_block (void)
3188 accept_statement (ST_SELECT_TYPE);
3190 cp = gfc_state_stack->tail;
3191 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
3193 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
3197 st = next_statement ();
3200 if (st == ST_END_SELECT)
3201 /* Empty SELECT CASE is OK. */
3203 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
3206 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
3207 "following SELECT TYPE at %C");
3209 reject_statement ();
3212 /* At this point, we're got a nonempty select block. */
3213 cp = new_level (cp);
3216 accept_statement (st);
3220 st = parse_executable (ST_NONE);
3228 cp = new_level (gfc_state_stack->head);
3230 gfc_clear_new_st ();
3232 accept_statement (st);
3238 /* Can't have an executable statement because of
3239 parse_executable(). */
3241 unexpected_statement (st);
3245 while (st != ST_END_SELECT);
3249 accept_statement (st);
3250 gfc_current_ns = gfc_current_ns->parent;
3255 /* Given a symbol, make sure it is not an iteration variable for a DO
3256 statement. This subroutine is called when the symbol is seen in a
3257 context that causes it to become redefined. If the symbol is an
3258 iterator, we generate an error message and return nonzero. */
3261 gfc_check_do_variable (gfc_symtree *st)
3265 for (s=gfc_state_stack; s; s = s->previous)
3266 if (s->do_variable == st)
3268 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3269 "loop beginning at %L", st->name, &s->head->loc);
3277 /* Checks to see if the current statement label closes an enddo.
3278 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3279 an error) if it incorrectly closes an ENDDO. */
3282 check_do_closure (void)
3286 if (gfc_statement_label == NULL)
3289 for (p = gfc_state_stack; p; p = p->previous)
3290 if (p->state == COMP_DO || p->state == COMP_DO_CONCURRENT)
3294 return 0; /* No loops to close */
3296 if (p->ext.end_do_label == gfc_statement_label)
3298 if (p == gfc_state_stack)
3301 gfc_error ("End of nonblock DO statement at %C is within another block");
3305 /* At this point, the label doesn't terminate the innermost loop.
3306 Make sure it doesn't terminate another one. */
3307 for (; p; p = p->previous)
3308 if ((p->state == COMP_DO || p->state == COMP_DO_CONCURRENT)
3309 && p->ext.end_do_label == gfc_statement_label)
3311 gfc_error ("End of nonblock DO statement at %C is interwoven "
3312 "with another DO loop");
3320 /* Parse a series of contained program units. */
3322 static void parse_progunit (gfc_statement);
3325 /* Parse a CRITICAL block. */
3328 parse_critical_block (void)
3334 s.ext.end_do_label = new_st.label1;
3336 accept_statement (ST_CRITICAL);
3337 top = gfc_state_stack->tail;
3339 push_state (&s, COMP_CRITICAL, gfc_new_block);
3341 d = add_statement ();
3342 d->op = EXEC_CRITICAL;
3347 st = parse_executable (ST_NONE);
3355 case ST_END_CRITICAL:
3356 if (s.ext.end_do_label != NULL
3357 && s.ext.end_do_label != gfc_statement_label)
3358 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3359 "match CRITICAL label");
3361 if (gfc_statement_label != NULL)
3363 new_st.op = EXEC_NOP;
3369 unexpected_statement (st);
3373 while (st != ST_END_CRITICAL);
3376 accept_statement (st);
3380 /* Set up the local namespace for a BLOCK construct. */
3383 gfc_build_block_ns (gfc_namespace *parent_ns)
3385 gfc_namespace* my_ns;
3386 static int numblock = 1;
3388 my_ns = gfc_get_namespace (parent_ns, 1);
3389 my_ns->construct_entities = 1;
3391 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3392 code generation (so it must not be NULL).
3393 We set its recursive argument if our container procedure is recursive, so
3394 that local variables are accordingly placed on the stack when it
3395 will be necessary. */
3397 my_ns->proc_name = gfc_new_block;
3401 char buffer[20]; /* Enough to hold "block@2147483648\n". */
3403 snprintf(buffer, sizeof(buffer), "block@%d", numblock++);
3404 gfc_get_symbol (buffer, my_ns, &my_ns->proc_name);
3405 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3406 my_ns->proc_name->name, NULL);
3408 gfc_commit_symbol (my_ns->proc_name);
3411 if (parent_ns->proc_name)
3412 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3418 /* Parse a BLOCK construct. */
3421 parse_block_construct (void)
3423 gfc_namespace* my_ns;
3426 gfc_notify_std (GFC_STD_F2008, "BLOCK construct at %C");
3428 my_ns = gfc_build_block_ns (gfc_current_ns);
3430 new_st.op = EXEC_BLOCK;
3431 new_st.ext.block.ns = my_ns;
3432 new_st.ext.block.assoc = NULL;
3433 accept_statement (ST_BLOCK);
3435 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3436 gfc_current_ns = my_ns;
3438 parse_progunit (ST_NONE);
3440 gfc_current_ns = gfc_current_ns->parent;
3445 /* Parse an ASSOCIATE construct. This is essentially a BLOCK construct
3446 behind the scenes with compiler-generated variables. */
3449 parse_associate (void)
3451 gfc_namespace* my_ns;
3454 gfc_association_list* a;
3456 gfc_notify_std (GFC_STD_F2003, "ASSOCIATE construct at %C");
3458 my_ns = gfc_build_block_ns (gfc_current_ns);
3460 new_st.op = EXEC_BLOCK;
3461 new_st.ext.block.ns = my_ns;
3462 gcc_assert (new_st.ext.block.assoc);
3464 /* Add all associate-names as BLOCK variables. Creating them is enough
3465 for now, they'll get their values during trans-* phase. */
3466 gfc_current_ns = my_ns;
3467 for (a = new_st.ext.block.assoc; a; a = a->next)
3471 if (gfc_get_sym_tree (a->name, NULL, &a->st, false))
3475 sym->attr.flavor = FL_VARIABLE;
3477 sym->declared_at = a->where;
3478 gfc_set_sym_referenced (sym);
3480 /* Initialize the typespec. It is not available in all cases,
3481 however, as it may only be set on the target during resolution.
3482 Still, sometimes it helps to have it right now -- especially
3483 for parsing component references on the associate-name
3484 in case of association to a derived-type. */
3485 sym->ts = a->target->ts;
3488 accept_statement (ST_ASSOCIATE);
3489 push_state (&s, COMP_ASSOCIATE, my_ns->proc_name);
3492 st = parse_executable (ST_NONE);
3499 accept_statement (st);
3500 my_ns->code = gfc_state_stack->head;
3504 unexpected_statement (st);
3508 gfc_current_ns = gfc_current_ns->parent;
3513 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3514 handled inside of parse_executable(), because they aren't really
3518 parse_do_block (void)
3527 s.ext.end_do_label = new_st.label1;
3529 if (new_st.ext.iterator != NULL)
3530 stree = new_st.ext.iterator->var->symtree;
3534 accept_statement (ST_DO);
3536 top = gfc_state_stack->tail;
3537 push_state (&s, do_op == EXEC_DO_CONCURRENT ? COMP_DO_CONCURRENT : COMP_DO,
3540 s.do_variable = stree;
3542 top->block = new_level (top);
3543 top->block->op = EXEC_DO;
3546 st = parse_executable (ST_NONE);
3554 if (s.ext.end_do_label != NULL
3555 && s.ext.end_do_label != gfc_statement_label)
3556 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3559 if (gfc_statement_label != NULL)
3561 new_st.op = EXEC_NOP;
3566 case ST_IMPLIED_ENDDO:
3567 /* If the do-stmt of this DO construct has a do-construct-name,
3568 the corresponding end-do must be an end-do-stmt (with a matching
3569 name, but in that case we must have seen ST_ENDDO first).
3570 We only complain about this in pedantic mode. */
3571 if (gfc_current_block () != NULL)
3572 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3573 &gfc_current_block()->declared_at);
3578 unexpected_statement (st);
3583 accept_statement (st);
3587 /* Parse the statements of OpenMP do/parallel do. */
3589 static gfc_statement
3590 parse_omp_do (gfc_statement omp_st)
3596 accept_statement (omp_st);
3598 cp = gfc_state_stack->tail;
3599 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3600 np = new_level (cp);
3606 st = next_statement ();
3609 else if (st == ST_DO)
3612 unexpected_statement (st);
3616 if (gfc_statement_label != NULL
3617 && gfc_state_stack->previous != NULL
3618 && gfc_state_stack->previous->state == COMP_DO
3619 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3627 there should be no !$OMP END DO. */
3629 return ST_IMPLIED_ENDDO;
3632 check_do_closure ();
3635 st = next_statement ();
3636 gfc_statement omp_end_st = ST_OMP_END_DO;
3639 case ST_OMP_SIMD: omp_end_st = ST_OMP_END_SIMD; break;
3640 case ST_OMP_DO: omp_end_st = ST_OMP_END_DO; break;
3641 case ST_OMP_DO_SIMD: omp_end_st = ST_OMP_END_DO_SIMD; break;
3642 case ST_OMP_PARALLEL_DO: omp_end_st = ST_OMP_END_PARALLEL_DO; break;
3643 case ST_OMP_PARALLEL_DO_SIMD:
3644 omp_end_st = ST_OMP_END_PARALLEL_DO_SIMD;
3646 default: gcc_unreachable ();
3648 if (st == omp_end_st)
3650 if (new_st.op == EXEC_OMP_END_NOWAIT)
3651 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3653 gcc_assert (new_st.op == EXEC_NOP);
3654 gfc_clear_new_st ();
3655 gfc_commit_symbols ();
3656 gfc_warning_check ();
3657 st = next_statement ();
3663 /* Parse the statements of OpenMP atomic directive. */
3665 static gfc_statement
3666 parse_omp_atomic (void)
3673 accept_statement (ST_OMP_ATOMIC);
3675 cp = gfc_state_stack->tail;
3676 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3677 np = new_level (cp);
3680 count = 1 + ((cp->ext.omp_atomic & GFC_OMP_ATOMIC_MASK)
3681 == GFC_OMP_ATOMIC_CAPTURE);
3685 st = next_statement ();
3688 else if (st == ST_ASSIGNMENT)
3690 accept_statement (st);
3694 unexpected_statement (st);
3699 st = next_statement ();
3700 if (st == ST_OMP_END_ATOMIC)
3702 gfc_clear_new_st ();
3703 gfc_commit_symbols ();
3704 gfc_warning_check ();
3705 st = next_statement ();
3707 else if ((cp->ext.omp_atomic & GFC_OMP_ATOMIC_MASK)
3708 == GFC_OMP_ATOMIC_CAPTURE)
3709 gfc_error ("Missing !$OMP END ATOMIC after !$OMP ATOMIC CAPTURE at %C");
3714 /* Parse the statements of an OpenMP structured block. */
3717 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3719 gfc_statement st, omp_end_st;
3723 accept_statement (omp_st);
3725 cp = gfc_state_stack->tail;
3726 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3727 np = new_level (cp);
3733 case ST_OMP_PARALLEL:
3734 omp_end_st = ST_OMP_END_PARALLEL;
3736 case ST_OMP_PARALLEL_SECTIONS:
3737 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3739 case ST_OMP_SECTIONS:
3740 omp_end_st = ST_OMP_END_SECTIONS;
3742 case ST_OMP_ORDERED:
3743 omp_end_st = ST_OMP_END_ORDERED;
3745 case ST_OMP_CRITICAL:
3746 omp_end_st = ST_OMP_END_CRITICAL;
3749 omp_end_st = ST_OMP_END_MASTER;
3752 omp_end_st = ST_OMP_END_SINGLE;
3755 omp_end_st = ST_OMP_END_TASK;
3757 case ST_OMP_TASKGROUP:
3758 omp_end_st = ST_OMP_END_TASKGROUP;
3760 case ST_OMP_WORKSHARE:
3761 omp_end_st = ST_OMP_END_WORKSHARE;
3763 case ST_OMP_PARALLEL_WORKSHARE:
3764 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3772 if (workshare_stmts_only)
3774 /* Inside of !$omp workshare, only
3777 where statements and constructs
3778 forall statements and constructs
3782 are allowed. For !$omp critical these
3783 restrictions apply recursively. */
3786 st = next_statement ();
3797 accept_statement (st);
3800 case ST_WHERE_BLOCK:
3801 parse_where_block ();
3804 case ST_FORALL_BLOCK:
3805 parse_forall_block ();
3808 case ST_OMP_PARALLEL:
3809 case ST_OMP_PARALLEL_SECTIONS:
3810 parse_omp_structured_block (st, false);
3813 case ST_OMP_PARALLEL_WORKSHARE:
3814 case ST_OMP_CRITICAL:
3815 parse_omp_structured_block (st, true);
3818 case ST_OMP_PARALLEL_DO:
3819 case ST_OMP_PARALLEL_DO_SIMD:
3820 st = parse_omp_do (st);
3824 st = parse_omp_atomic ();
3835 st = next_statement ();
3839 st = parse_executable (ST_NONE);
3842 else if (st == ST_OMP_SECTION
3843 && (omp_st == ST_OMP_SECTIONS
3844 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3846 np = new_level (np);
3850 else if (st != omp_end_st)
3851 unexpected_statement (st);
3853 while (st != omp_end_st);
3857 case EXEC_OMP_END_NOWAIT:
3858 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3860 case EXEC_OMP_CRITICAL:
3861 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3862 || (new_st.ext.omp_name != NULL
3863 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3864 gfc_error ("Name after !$omp critical and !$omp end critical does "
3866 free (CONST_CAST (char *, new_st.ext.omp_name));
3868 case EXEC_OMP_END_SINGLE:
3869 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3870 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3871 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3872 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3880 gfc_clear_new_st ();
3881 gfc_commit_symbols ();
3882 gfc_warning_check ();
3887 /* Accept a series of executable statements. We return the first
3888 statement that doesn't fit to the caller. Any block statements are
3889 passed on to the correct handler, which usually passes the buck
3892 static gfc_statement
3893 parse_executable (gfc_statement st)
3898 st = next_statement ();
3902 close_flag = check_do_closure ();
3907 case ST_END_PROGRAM:
3910 case ST_END_FUNCTION:
3915 case ST_END_SUBROUTINE:
3920 case ST_SELECT_CASE:
3921 gfc_error ("%s statement at %C cannot terminate a non-block "
3922 "DO loop", gfc_ascii_statement (st));
3935 gfc_notify_std (GFC_STD_F95_OBS, "DATA statement at %C after the "
3936 "first executable statement");
3942 accept_statement (st);
3943 if (close_flag == 1)
3944 return ST_IMPLIED_ENDDO;
3948 parse_block_construct ();
3959 case ST_SELECT_CASE:
3960 parse_select_block ();
3963 case ST_SELECT_TYPE:
3964 parse_select_type_block();
3969 if (check_do_closure () == 1)
3970 return ST_IMPLIED_ENDDO;
3974 parse_critical_block ();
3977 case ST_WHERE_BLOCK:
3978 parse_where_block ();
3981 case ST_FORALL_BLOCK:
3982 parse_forall_block ();
3985 case ST_OMP_PARALLEL:
3986 case ST_OMP_PARALLEL_SECTIONS:
3987 case ST_OMP_SECTIONS:
3988 case ST_OMP_ORDERED:
3989 case ST_OMP_CRITICAL:
3993 case ST_OMP_TASKGROUP:
3994 parse_omp_structured_block (st, false);
3997 case ST_OMP_WORKSHARE:
3998 case ST_OMP_PARALLEL_WORKSHARE:
3999 parse_omp_structured_block (st, true);
4003 case ST_OMP_DO_SIMD:
4004 case ST_OMP_PARALLEL_DO:
4005 case ST_OMP_PARALLEL_DO_SIMD:
4007 st = parse_omp_do (st);
4008 if (st == ST_IMPLIED_ENDDO)
4013 st = parse_omp_atomic ();
4020 st = next_statement ();
4025 /* Fix the symbols for sibling functions. These are incorrectly added to
4026 the child namespace as the parser didn't know about this procedure. */
4029 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
4033 gfc_symbol *old_sym;
4035 for (ns = siblings; ns; ns = ns->sibling)
4037 st = gfc_find_symtree (ns->sym_root, sym->name);
4039 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
4040 goto fixup_contained;
4042 if ((st->n.sym->attr.flavor == FL_DERIVED
4043 && sym->attr.generic && sym->attr.function)
4044 ||(sym->attr.flavor == FL_DERIVED
4045 && st->n.sym->attr.generic && st->n.sym->attr.function))
4046 goto fixup_contained;
4048 old_sym = st->n.sym;
4049 if (old_sym->ns == ns
4050 && !old_sym->attr.contained
4052 /* By 14.6.1.3, host association should be excluded
4053 for the following. */
4054 && !(old_sym->attr.external
4055 || (old_sym->ts.type != BT_UNKNOWN
4056 && !old_sym->attr.implicit_type)
4057 || old_sym->attr.flavor == FL_PARAMETER
4058 || old_sym->attr.use_assoc
4059 || old_sym->attr.in_common
4060 || old_sym->attr.in_equivalence
4061 || old_sym->attr.data
4062 || old_sym->attr.dummy
4063 || old_sym->attr.result
4064 || old_sym->attr.dimension
4065 || old_sym->attr.allocatable
4066 || old_sym->attr.intrinsic
4067 || old_sym->attr.generic
4068 || old_sym->attr.flavor == FL_NAMELIST
4069 || old_sym->attr.flavor == FL_LABEL
4070 || old_sym->attr.proc == PROC_ST_FUNCTION))
4072 /* Replace it with the symbol from the parent namespace. */
4076 gfc_release_symbol (old_sym);
4080 /* Do the same for any contained procedures. */
4081 gfc_fixup_sibling_symbols (sym, ns->contained);
4086 parse_contained (int module)
4088 gfc_namespace *ns, *parent_ns, *tmp;
4089 gfc_state_data s1, s2;
4093 int contains_statements = 0;
4096 push_state (&s1, COMP_CONTAINS, NULL);
4097 parent_ns = gfc_current_ns;
4101 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
4103 gfc_current_ns->sibling = parent_ns->contained;
4104 parent_ns->contained = gfc_current_ns;
4107 /* Process the next available statement. We come here if we got an error
4108 and rejected the last statement. */
4109 st = next_statement ();
4118 contains_statements = 1;
4119 accept_statement (st);
4122 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
4125 /* For internal procedures, create/update the symbol in the
4126 parent namespace. */
4130 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
4131 gfc_error ("Contained procedure '%s' at %C is already "
4132 "ambiguous", gfc_new_block->name);
4135 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL,
4137 &gfc_new_block->declared_at))
4139 if (st == ST_FUNCTION)
4140 gfc_add_function (&sym->attr, sym->name,
4141 &gfc_new_block->declared_at);
4143 gfc_add_subroutine (&sym->attr, sym->name,
4144 &gfc_new_block->declared_at);
4148 gfc_commit_symbols ();
4151 sym = gfc_new_block;
4153 /* Mark this as a contained function, so it isn't replaced
4154 by other module functions. */
4155 sym->attr.contained = 1;
4157 /* Set implicit_pure so that it can be reset if any of the
4158 tests for purity fail. This is used for some optimisation
4159 during translation. */
4160 if (!sym->attr.pure)
4161 sym->attr.implicit_pure = 1;
4163 parse_progunit (ST_NONE);
4165 /* Fix up any sibling functions that refer to this one. */
4166 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
4167 /* Or refer to any of its alternate entry points. */
4168 for (el = gfc_current_ns->entries; el; el = el->next)
4169 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
4171 gfc_current_ns->code = s2.head;
4172 gfc_current_ns = parent_ns;
4177 /* These statements are associated with the end of the host unit. */
4178 case ST_END_FUNCTION:
4180 case ST_END_PROGRAM:
4181 case ST_END_SUBROUTINE:
4182 accept_statement (st);
4183 gfc_current_ns->code = s1.head;
4187 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
4188 gfc_ascii_statement (st));
4189 reject_statement ();
4195 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
4196 && st != ST_END_MODULE && st != ST_END_PROGRAM);
4198 /* The first namespace in the list is guaranteed to not have
4199 anything (worthwhile) in it. */
4200 tmp = gfc_current_ns;
4201 gfc_current_ns = parent_ns;
4202 if (seen_error && tmp->refs > 1)
4203 gfc_free_namespace (tmp);
4205 ns = gfc_current_ns->contained;
4206 gfc_current_ns->contained = ns->sibling;
4207 gfc_free_namespace (ns);
4210 if (!contains_statements)
4211 gfc_notify_std (GFC_STD_F2008, "CONTAINS statement without "
4212 "FUNCTION or SUBROUTINE statement at %C");
4216 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
4219 parse_progunit (gfc_statement st)
4224 st = parse_spec (st);
4231 /* This is not allowed within BLOCK! */
4232 if (gfc_current_state () != COMP_BLOCK)
4237 accept_statement (st);
4244 if (gfc_current_state () == COMP_FUNCTION)
4245 gfc_check_function_type (gfc_current_ns);
4250 st = parse_executable (st);
4258 /* This is not allowed within BLOCK! */
4259 if (gfc_current_state () != COMP_BLOCK)
4264 accept_statement (st);
4271 unexpected_statement (st);
4272 reject_statement ();
4273 st = next_statement ();
4279 for (p = gfc_state_stack; p; p = p->previous)
4280 if (p->state == COMP_CONTAINS)
4283 if (gfc_find_state (COMP_MODULE) == true)
4288 gfc_error ("CONTAINS statement at %C is already in a contained "
4290 reject_statement ();
4291 st = next_statement ();
4295 parse_contained (0);
4298 gfc_current_ns->code = gfc_state_stack->head;
4302 /* Come here to complain about a global symbol already in use as
4306 gfc_global_used (gfc_gsymbol *sym, locus *where)
4311 where = &gfc_current_locus;
4321 case GSYM_SUBROUTINE:
4322 name = "SUBROUTINE";
4327 case GSYM_BLOCK_DATA:
4328 name = "BLOCK DATA";
4334 gfc_internal_error ("gfc_global_used(): Bad type");
4338 if (sym->binding_label)
4339 gfc_error ("Global binding name '%s' at %L is already being used as a %s "
4340 "at %L", sym->binding_label, where, name, &sym->where);
4342 gfc_error ("Global name '%s' at %L is already being used as a %s at %L",
4343 sym->name, where, name, &sym->where);
4347 /* Parse a block data program unit. */
4350 parse_block_data (void)
4353 static locus blank_locus;
4354 static int blank_block=0;
4357 gfc_current_ns->proc_name = gfc_new_block;
4358 gfc_current_ns->is_block_data = 1;
4360 if (gfc_new_block == NULL)
4363 gfc_error ("Blank BLOCK DATA at %C conflicts with "
4364 "prior BLOCK DATA at %L", &blank_locus);
4368 blank_locus = gfc_current_locus;
4373 s = gfc_get_gsymbol (gfc_new_block->name);
4375 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
4376 gfc_global_used (s, &gfc_new_block->declared_at);
4379 s->type = GSYM_BLOCK_DATA;
4380 s->where = gfc_new_block->declared_at;
4385 st = parse_spec (ST_NONE);
4387 while (st != ST_END_BLOCK_DATA)
4389 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
4390 gfc_ascii_statement (st));
4391 reject_statement ();
4392 st = next_statement ();
4397 /* Parse a module subprogram. */
4406 s = gfc_get_gsymbol (gfc_new_block->name);
4407 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4408 gfc_global_used (s, &gfc_new_block->declared_at);
4411 s->type = GSYM_MODULE;
4412 s->where = gfc_new_block->declared_at;
4416 st = parse_spec (ST_NONE);
4426 parse_contained (1);
4430 accept_statement (st);
4434 gfc_error ("Unexpected %s statement in MODULE at %C",
4435 gfc_ascii_statement (st));
4438 reject_statement ();
4439 st = next_statement ();
4443 /* Make sure not to free the namespace twice on error. */
4445 s->ns = gfc_current_ns;
4449 /* Add a procedure name to the global symbol table. */
4452 add_global_procedure (bool sub)
4456 /* Only in Fortran 2003: For procedures with a binding label also the Fortran
4457 name is a global identifier. */
4458 if (!gfc_new_block->binding_label || gfc_notification_std (GFC_STD_F2008))
4460 s = gfc_get_gsymbol (gfc_new_block->name);
4463 || (s->type != GSYM_UNKNOWN
4464 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4466 gfc_global_used (s, &gfc_new_block->declared_at);
4467 /* Silence follow-up errors. */
4468 gfc_new_block->binding_label = NULL;
4472 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4473 s->sym_name = gfc_new_block->name;
4474 s->where = gfc_new_block->declared_at;
4476 s->ns = gfc_current_ns;
4480 /* Don't add the symbol multiple times. */
4481 if (gfc_new_block->binding_label
4482 && (!gfc_notification_std (GFC_STD_F2008)
4483 || strcmp (gfc_new_block->name, gfc_new_block->binding_label) != 0))
4485 s = gfc_get_gsymbol (gfc_new_block->binding_label);
4488 || (s->type != GSYM_UNKNOWN
4489 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4491 gfc_global_used (s, &gfc_new_block->declared_at);
4492 /* Silence follow-up errors. */
4493 gfc_new_block->binding_label = NULL;
4497 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4498 s->sym_name = gfc_new_block->name;
4499 s->binding_label = gfc_new_block->binding_label;
4500 s->where = gfc_new_block->declared_at;
4502 s->ns = gfc_current_ns;
4508 /* Add a program to the global symbol table. */
4511 add_global_program (void)
4515 if (gfc_new_block == NULL)
4517 s = gfc_get_gsymbol (gfc_new_block->name);
4519 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4520 gfc_global_used (s, &gfc_new_block->declared_at);
4523 s->type = GSYM_PROGRAM;
4524 s->where = gfc_new_block->declared_at;
4526 s->ns = gfc_current_ns;
4531 /* Resolve all the program units. */
4533 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4535 gfc_free_dt_list ();
4536 gfc_current_ns = gfc_global_ns_list;
4537 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4539 if (gfc_current_ns->proc_name
4540 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4541 continue; /* Already resolved. */
4543 if (gfc_current_ns->proc_name)
4544 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4545 gfc_resolve (gfc_current_ns);
4546 gfc_current_ns->derived_types = gfc_derived_types;
4547 gfc_derived_types = NULL;
4553 clean_up_modules (gfc_gsymbol *gsym)
4558 clean_up_modules (gsym->left);
4559 clean_up_modules (gsym->right);
4561 if (gsym->type != GSYM_MODULE || !gsym->ns)
4564 gfc_current_ns = gsym->ns;
4565 gfc_derived_types = gfc_current_ns->derived_types;
4572 /* Translate all the program units. This could be in a different order
4573 to resolution if there are forward references in the file. */
4575 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
4579 gfc_current_ns = gfc_global_ns_list;
4580 gfc_get_errors (NULL, &errors);
4582 /* We first translate all modules to make sure that later parts
4583 of the program can use the decl. Then we translate the nonmodules. */
4585 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4587 if (!gfc_current_ns->proc_name
4588 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4591 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4592 gfc_derived_types = gfc_current_ns->derived_types;
4593 gfc_generate_module_code (gfc_current_ns);
4594 gfc_current_ns->translated = 1;
4597 gfc_current_ns = gfc_global_ns_list;
4598 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4600 if (gfc_current_ns->proc_name
4601 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4604 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4605 gfc_derived_types = gfc_current_ns->derived_types;
4606 gfc_generate_code (gfc_current_ns);
4607 gfc_current_ns->translated = 1;
4610 /* Clean up all the namespaces after translation. */
4611 gfc_current_ns = gfc_global_ns_list;
4612 for (;gfc_current_ns;)
4616 if (gfc_current_ns->proc_name
4617 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4619 gfc_current_ns = gfc_current_ns->sibling;
4623 ns = gfc_current_ns->sibling;
4624 gfc_derived_types = gfc_current_ns->derived_types;
4626 gfc_current_ns = ns;
4629 clean_up_modules (gfc_gsym_root);
4633 /* Top level parser. */
4636 gfc_parse_file (void)
4638 int seen_program, errors_before, errors;
4639 gfc_state_data top, s;
4642 gfc_namespace *next;
4644 gfc_start_source_files ();
4646 top.state = COMP_NONE;
4648 top.previous = NULL;
4649 top.head = top.tail = NULL;
4650 top.do_variable = NULL;
4652 gfc_state_stack = ⊤
4654 gfc_clear_new_st ();
4656 gfc_statement_label = NULL;
4658 if (setjmp (eof_buf))
4659 return false; /* Come here on unexpected EOF */
4661 /* Prepare the global namespace that will contain the
4663 gfc_global_ns_list = next = NULL;
4668 /* Exit early for empty files. */
4674 st = next_statement ();
4683 goto duplicate_main;
4685 prog_locus = gfc_current_locus;
4687 push_state (&s, COMP_PROGRAM, gfc_new_block);
4688 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4689 accept_statement (st);
4690 add_global_program ();
4691 parse_progunit (ST_NONE);
4696 add_global_procedure (true);
4697 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4698 accept_statement (st);
4699 parse_progunit (ST_NONE);
4704 add_global_procedure (false);
4705 push_state (&s, COMP_FUNCTION, gfc_new_block);
4706 accept_statement (st);
4707 parse_progunit (ST_NONE);
4712 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4713 accept_statement (st);
4714 parse_block_data ();
4718 push_state (&s, COMP_MODULE, gfc_new_block);
4719 accept_statement (st);
4721 gfc_get_errors (NULL, &errors_before);
4725 /* Anything else starts a nameless main program block. */
4728 goto duplicate_main;
4730 prog_locus = gfc_current_locus;
4732 push_state (&s, COMP_PROGRAM, gfc_new_block);
4733 main_program_symbol (gfc_current_ns, "MAIN__");
4734 parse_progunit (st);
4739 /* Handle the non-program units. */
4740 gfc_current_ns->code = s.head;
4742 gfc_resolve (gfc_current_ns);
4744 /* Dump the parse tree if requested. */
4745 if (gfc_option.dump_fortran_original)
4746 gfc_dump_parse_tree (gfc_current_ns, stdout);
4748 gfc_get_errors (NULL, &errors);
4749 if (s.state == COMP_MODULE)
4751 gfc_dump_module (s.sym->name, errors_before == errors);
4752 gfc_current_ns->derived_types = gfc_derived_types;
4753 gfc_derived_types = NULL;
4759 gfc_generate_code (gfc_current_ns);
4767 /* The main program and non-contained procedures are put
4768 in the global namespace list, so that they can be processed
4769 later and all their interfaces resolved. */
4770 gfc_current_ns->code = s.head;
4773 for (; next->sibling; next = next->sibling)
4775 next->sibling = gfc_current_ns;
4778 gfc_global_ns_list = gfc_current_ns;
4780 next = gfc_current_ns;
4787 /* Do the resolution. */
4788 resolve_all_program_units (gfc_global_ns_list);
4790 /* Do the parse tree dump. */
4792 = gfc_option.dump_fortran_original ? gfc_global_ns_list : NULL;
4794 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4795 if (!gfc_current_ns->proc_name
4796 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4798 gfc_dump_parse_tree (gfc_current_ns, stdout);
4799 fputs ("------------------------------------------\n\n", stdout);
4802 /* Do the translation. */
4803 translate_all_program_units (gfc_global_ns_list);
4805 gfc_end_source_files ();
4809 /* If we see a duplicate main program, shut down. If the second
4810 instance is an implied main program, i.e. data decls or executable
4811 statements, we're in for lots of errors. */
4812 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4813 reject_statement ();