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;
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 /* Look for allocatable components. */
2130 if (c->attr.allocatable
2131 || (c->ts.type == BT_CLASS && c->attr.class_ok
2132 && CLASS_DATA (c)->attr.allocatable)
2133 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2134 sym->attr.alloc_comp = 1;
2136 /* Look for pointer components. */
2138 || (c->ts.type == BT_CLASS && c->attr.class_ok
2139 && CLASS_DATA (c)->attr.class_pointer)
2140 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2141 sym->attr.pointer_comp = 1;
2143 /* Look for procedure pointer components. */
2144 if (c->attr.proc_pointer
2145 || (c->ts.type == BT_DERIVED
2146 && c->ts.u.derived->attr.proc_pointer_comp))
2147 sym->attr.proc_pointer_comp = 1;
2149 /* Looking for coarray components. */
2150 if (c->attr.codimension
2151 || (c->attr.coarray_comp && !c->attr.pointer && !c->attr.allocatable))
2152 sym->attr.coarray_comp = 1;
2154 /* Looking for lock_type components. */
2155 if (c->attr.lock_comp
2156 || (sym->ts.type == BT_DERIVED
2157 && c->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2158 && c->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE))
2159 sym->attr.lock_comp = 1;
2161 /* Look for private components. */
2162 if (sym->component_access == ACCESS_PRIVATE
2163 || c->attr.access == ACCESS_PRIVATE
2164 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2165 sym->attr.private_comp = 1;
2168 if (!seen_component)
2169 sym->attr.zero_comp = 1;
2175 /* Parse an ENUM. */
2183 int seen_enumerator = 0;
2185 push_state (&s, COMP_ENUM, gfc_new_block);
2189 while (compiling_enum)
2191 st = next_statement ();
2199 seen_enumerator = 1;
2200 accept_statement (st);
2205 if (!seen_enumerator)
2206 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2207 accept_statement (st);
2211 gfc_free_enum_history ();
2212 unexpected_statement (st);
2220 /* Parse an interface. We must be able to deal with the possibility
2221 of recursive interfaces. The parse_spec() subroutine is mutually
2222 recursive with parse_interface(). */
2224 static gfc_statement parse_spec (gfc_statement);
2227 parse_interface (void)
2229 gfc_compile_state new_state = COMP_NONE, current_state;
2230 gfc_symbol *prog_unit, *sym;
2231 gfc_interface_info save;
2232 gfc_state_data s1, s2;
2236 accept_statement (ST_INTERFACE);
2238 current_interface.ns = gfc_current_ns;
2239 save = current_interface;
2241 sym = (current_interface.type == INTERFACE_GENERIC
2242 || current_interface.type == INTERFACE_USER_OP)
2243 ? gfc_new_block : NULL;
2245 push_state (&s1, COMP_INTERFACE, sym);
2246 current_state = COMP_NONE;
2249 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2251 st = next_statement ();
2259 if (st == ST_SUBROUTINE)
2260 new_state = COMP_SUBROUTINE;
2261 else if (st == ST_FUNCTION)
2262 new_state = COMP_FUNCTION;
2263 if (gfc_new_block->attr.pointer)
2265 gfc_new_block->attr.pointer = 0;
2266 gfc_new_block->attr.proc_pointer = 1;
2268 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2269 gfc_new_block->formal, NULL) == FAILURE)
2271 reject_statement ();
2272 gfc_free_namespace (gfc_current_ns);
2278 case ST_MODULE_PROC: /* The module procedure matcher makes
2279 sure the context is correct. */
2280 accept_statement (st);
2281 gfc_free_namespace (gfc_current_ns);
2284 case ST_END_INTERFACE:
2285 gfc_free_namespace (gfc_current_ns);
2286 gfc_current_ns = current_interface.ns;
2290 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2291 gfc_ascii_statement (st));
2292 reject_statement ();
2293 gfc_free_namespace (gfc_current_ns);
2298 /* Make sure that the generic name has the right attribute. */
2299 if (current_interface.type == INTERFACE_GENERIC
2300 && current_state == COMP_NONE)
2302 if (new_state == COMP_FUNCTION && sym)
2303 gfc_add_function (&sym->attr, sym->name, NULL);
2304 else if (new_state == COMP_SUBROUTINE && sym)
2305 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2307 current_state = new_state;
2310 if (current_interface.type == INTERFACE_ABSTRACT)
2312 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2313 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2314 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2315 "cannot be the same as an intrinsic type",
2316 gfc_new_block->name);
2319 push_state (&s2, new_state, gfc_new_block);
2320 accept_statement (st);
2321 prog_unit = gfc_new_block;
2322 prog_unit->formal_ns = gfc_current_ns;
2323 proc_locus = gfc_current_locus;
2326 /* Read data declaration statements. */
2327 st = parse_spec (ST_NONE);
2329 /* Since the interface block does not permit an IMPLICIT statement,
2330 the default type for the function or the result must be taken
2331 from the formal namespace. */
2332 if (new_state == COMP_FUNCTION)
2334 if (prog_unit->result == prog_unit
2335 && prog_unit->ts.type == BT_UNKNOWN)
2336 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2337 else if (prog_unit->result != prog_unit
2338 && prog_unit->result->ts.type == BT_UNKNOWN)
2339 gfc_set_default_type (prog_unit->result, 1,
2340 prog_unit->formal_ns);
2343 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2345 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2346 gfc_ascii_statement (st));
2347 reject_statement ();
2351 /* Add EXTERNAL attribute to function or subroutine. */
2352 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2353 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2355 current_interface = save;
2356 gfc_add_interface (prog_unit);
2359 if (current_interface.ns
2360 && current_interface.ns->proc_name
2361 && strcmp (current_interface.ns->proc_name->name,
2362 prog_unit->name) == 0)
2363 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2364 "enclosing procedure", prog_unit->name, &proc_locus);
2373 /* Associate function characteristics by going back to the function
2374 declaration and rematching the prefix. */
2377 match_deferred_characteristics (gfc_typespec * ts)
2380 match m = MATCH_ERROR;
2381 char name[GFC_MAX_SYMBOL_LEN + 1];
2383 loc = gfc_current_locus;
2385 gfc_current_locus = gfc_current_block ()->declared_at;
2388 gfc_buffer_error (1);
2389 m = gfc_match_prefix (ts);
2390 gfc_buffer_error (0);
2392 if (ts->type == BT_DERIVED)
2400 /* Only permit one go at the characteristic association. */
2404 /* Set the function locus correctly. If we have not found the
2405 function name, there is an error. */
2407 && gfc_match ("function% %n", name) == MATCH_YES
2408 && strcmp (name, gfc_current_block ()->name) == 0)
2410 gfc_current_block ()->declared_at = gfc_current_locus;
2411 gfc_commit_symbols ();
2416 gfc_undo_symbols ();
2419 gfc_current_locus =loc;
2424 /* Check specification-expressions in the function result of the currently
2425 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2426 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2427 scope are not yet parsed so this has to be delayed up to parse_spec. */
2430 check_function_result_typed (void)
2432 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2434 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2435 gcc_assert (ts->type != BT_UNKNOWN);
2437 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2438 /* TODO: Extend when KIND type parameters are implemented. */
2439 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2440 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2444 /* Parse a set of specification statements. Returns the statement
2445 that doesn't fit. */
2447 static gfc_statement
2448 parse_spec (gfc_statement st)
2451 bool function_result_typed = false;
2452 bool bad_characteristic = false;
2455 verify_st_order (&ss, ST_NONE, false);
2457 st = next_statement ();
2459 /* If we are not inside a function or don't have a result specified so far,
2460 do nothing special about it. */
2461 if (gfc_current_state () != COMP_FUNCTION)
2462 function_result_typed = true;
2465 gfc_symbol* proc = gfc_current_ns->proc_name;
2468 if (proc->result->ts.type == BT_UNKNOWN)
2469 function_result_typed = true;
2474 /* If we're inside a BLOCK construct, some statements are disallowed.
2475 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2476 or VALUE are also disallowed, but they don't have a particular ST_*
2477 key so we have to check for them individually in their matcher routine. */
2478 if (gfc_current_state () == COMP_BLOCK)
2482 case ST_IMPLICIT_NONE:
2485 case ST_EQUIVALENCE:
2486 case ST_STATEMENT_FUNCTION:
2487 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2488 gfc_ascii_statement (st));
2489 reject_statement ();
2496 /* If we find a statement that can not be followed by an IMPLICIT statement
2497 (and thus we can expect to see none any further), type the function result
2498 if it has not yet been typed. Be careful not to give the END statement
2499 to verify_st_order! */
2500 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2502 bool verify_now = false;
2504 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2509 verify_st_order (&dummyss, ST_NONE, false);
2510 verify_st_order (&dummyss, st, false);
2512 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2518 check_function_result_typed ();
2519 function_result_typed = true;
2528 case ST_IMPLICIT_NONE:
2530 if (!function_result_typed)
2532 check_function_result_typed ();
2533 function_result_typed = true;
2539 case ST_DATA: /* Not allowed in interfaces */
2540 if (gfc_current_state () == COMP_INTERFACE)
2550 case ST_DERIVED_DECL:
2553 if (verify_st_order (&ss, st, false) == FAILURE)
2555 reject_statement ();
2556 st = next_statement ();
2566 case ST_DERIVED_DECL:
2572 if (gfc_current_state () != COMP_MODULE)
2574 gfc_error ("%s statement must appear in a MODULE",
2575 gfc_ascii_statement (st));
2576 reject_statement ();
2580 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2582 gfc_error ("%s statement at %C follows another accessibility "
2583 "specification", gfc_ascii_statement (st));
2584 reject_statement ();
2588 gfc_current_ns->default_access = (st == ST_PUBLIC)
2589 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2593 case ST_STATEMENT_FUNCTION:
2594 if (gfc_current_state () == COMP_MODULE)
2596 unexpected_statement (st);
2604 accept_statement (st);
2605 st = next_statement ();
2609 accept_statement (st);
2611 st = next_statement ();
2614 case ST_GET_FCN_CHARACTERISTICS:
2615 /* This statement triggers the association of a function's result
2617 ts = &gfc_current_block ()->result->ts;
2618 if (match_deferred_characteristics (ts) != MATCH_YES)
2619 bad_characteristic = true;
2621 st = next_statement ();
2628 /* If match_deferred_characteristics failed, then there is an error. */
2629 if (bad_characteristic)
2631 ts = &gfc_current_block ()->result->ts;
2632 if (ts->type != BT_DERIVED)
2633 gfc_error ("Bad kind expression for function '%s' at %L",
2634 gfc_current_block ()->name,
2635 &gfc_current_block ()->declared_at);
2637 gfc_error ("The type for function '%s' at %L is not accessible",
2638 gfc_current_block ()->name,
2639 &gfc_current_block ()->declared_at);
2641 gfc_current_block ()->ts.kind = 0;
2642 /* Keep the derived type; if it's bad, it will be discovered later. */
2643 if (!(ts->type == BT_DERIVED && ts->u.derived))
2644 ts->type = BT_UNKNOWN;
2651 /* Parse a WHERE block, (not a simple WHERE statement). */
2654 parse_where_block (void)
2656 int seen_empty_else;
2661 accept_statement (ST_WHERE_BLOCK);
2662 top = gfc_state_stack->tail;
2664 push_state (&s, COMP_WHERE, gfc_new_block);
2666 d = add_statement ();
2667 d->expr1 = top->expr1;
2673 seen_empty_else = 0;
2677 st = next_statement ();
2683 case ST_WHERE_BLOCK:
2684 parse_where_block ();
2689 accept_statement (st);
2693 if (seen_empty_else)
2695 gfc_error ("ELSEWHERE statement at %C follows previous "
2696 "unmasked ELSEWHERE");
2700 if (new_st.expr1 == NULL)
2701 seen_empty_else = 1;
2703 d = new_level (gfc_state_stack->head);
2705 d->expr1 = new_st.expr1;
2707 accept_statement (st);
2712 accept_statement (st);
2716 gfc_error ("Unexpected %s statement in WHERE block at %C",
2717 gfc_ascii_statement (st));
2718 reject_statement ();
2722 while (st != ST_END_WHERE);
2728 /* Parse a FORALL block (not a simple FORALL statement). */
2731 parse_forall_block (void)
2737 accept_statement (ST_FORALL_BLOCK);
2738 top = gfc_state_stack->tail;
2740 push_state (&s, COMP_FORALL, gfc_new_block);
2742 d = add_statement ();
2743 d->op = EXEC_FORALL;
2748 st = next_statement ();
2753 case ST_POINTER_ASSIGNMENT:
2756 accept_statement (st);
2759 case ST_WHERE_BLOCK:
2760 parse_where_block ();
2763 case ST_FORALL_BLOCK:
2764 parse_forall_block ();
2768 accept_statement (st);
2775 gfc_error ("Unexpected %s statement in FORALL block at %C",
2776 gfc_ascii_statement (st));
2778 reject_statement ();
2782 while (st != ST_END_FORALL);
2788 static gfc_statement parse_executable (gfc_statement);
2790 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2793 parse_if_block (void)
2802 accept_statement (ST_IF_BLOCK);
2804 top = gfc_state_stack->tail;
2805 push_state (&s, COMP_IF, gfc_new_block);
2807 new_st.op = EXEC_IF;
2808 d = add_statement ();
2810 d->expr1 = top->expr1;
2816 st = parse_executable (ST_NONE);
2826 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2827 "statement at %L", &else_locus);
2829 reject_statement ();
2833 d = new_level (gfc_state_stack->head);
2835 d->expr1 = new_st.expr1;
2837 accept_statement (st);
2844 gfc_error ("Duplicate ELSE statements at %L and %C",
2846 reject_statement ();
2851 else_locus = gfc_current_locus;
2853 d = new_level (gfc_state_stack->head);
2856 accept_statement (st);
2864 unexpected_statement (st);
2868 while (st != ST_ENDIF);
2871 accept_statement (st);
2875 /* Parse a SELECT block. */
2878 parse_select_block (void)
2884 accept_statement (ST_SELECT_CASE);
2886 cp = gfc_state_stack->tail;
2887 push_state (&s, COMP_SELECT, gfc_new_block);
2889 /* Make sure that the next statement is a CASE or END SELECT. */
2892 st = next_statement ();
2895 if (st == ST_END_SELECT)
2897 /* Empty SELECT CASE is OK. */
2898 accept_statement (st);
2905 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2908 reject_statement ();
2911 /* At this point, we're got a nonempty select block. */
2912 cp = new_level (cp);
2915 accept_statement (st);
2919 st = parse_executable (ST_NONE);
2926 cp = new_level (gfc_state_stack->head);
2928 gfc_clear_new_st ();
2930 accept_statement (st);
2936 /* Can't have an executable statement because of
2937 parse_executable(). */
2939 unexpected_statement (st);
2943 while (st != ST_END_SELECT);
2946 accept_statement (st);
2950 /* Pop the current selector from the SELECT TYPE stack. */
2953 select_type_pop (void)
2955 gfc_select_type_stack *old = select_type_stack;
2956 select_type_stack = old->prev;
2961 /* Parse a SELECT TYPE construct (F03:R821). */
2964 parse_select_type_block (void)
2970 accept_statement (ST_SELECT_TYPE);
2972 cp = gfc_state_stack->tail;
2973 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
2975 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
2979 st = next_statement ();
2982 if (st == ST_END_SELECT)
2983 /* Empty SELECT CASE is OK. */
2985 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
2988 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
2989 "following SELECT TYPE at %C");
2991 reject_statement ();
2994 /* At this point, we're got a nonempty select block. */
2995 cp = new_level (cp);
2998 accept_statement (st);
3002 st = parse_executable (ST_NONE);
3010 cp = new_level (gfc_state_stack->head);
3012 gfc_clear_new_st ();
3014 accept_statement (st);
3020 /* Can't have an executable statement because of
3021 parse_executable(). */
3023 unexpected_statement (st);
3027 while (st != ST_END_SELECT);
3031 accept_statement (st);
3032 gfc_current_ns = gfc_current_ns->parent;
3037 /* Given a symbol, make sure it is not an iteration variable for a DO
3038 statement. This subroutine is called when the symbol is seen in a
3039 context that causes it to become redefined. If the symbol is an
3040 iterator, we generate an error message and return nonzero. */
3043 gfc_check_do_variable (gfc_symtree *st)
3047 for (s=gfc_state_stack; s; s = s->previous)
3048 if (s->do_variable == st)
3050 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3051 "loop beginning at %L", st->name, &s->head->loc);
3059 /* Checks to see if the current statement label closes an enddo.
3060 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3061 an error) if it incorrectly closes an ENDDO. */
3064 check_do_closure (void)
3068 if (gfc_statement_label == NULL)
3071 for (p = gfc_state_stack; p; p = p->previous)
3072 if (p->state == COMP_DO)
3076 return 0; /* No loops to close */
3078 if (p->ext.end_do_label == gfc_statement_label)
3080 if (p == gfc_state_stack)
3083 gfc_error ("End of nonblock DO statement at %C is within another block");
3087 /* At this point, the label doesn't terminate the innermost loop.
3088 Make sure it doesn't terminate another one. */
3089 for (; p; p = p->previous)
3090 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
3092 gfc_error ("End of nonblock DO statement at %C is interwoven "
3093 "with another DO loop");
3101 /* Parse a series of contained program units. */
3103 static void parse_progunit (gfc_statement);
3106 /* Parse a CRITICAL block. */
3109 parse_critical_block (void)
3115 s.ext.end_do_label = new_st.label1;
3117 accept_statement (ST_CRITICAL);
3118 top = gfc_state_stack->tail;
3120 push_state (&s, COMP_CRITICAL, gfc_new_block);
3122 d = add_statement ();
3123 d->op = EXEC_CRITICAL;
3128 st = parse_executable (ST_NONE);
3136 case ST_END_CRITICAL:
3137 if (s.ext.end_do_label != NULL
3138 && s.ext.end_do_label != gfc_statement_label)
3139 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3140 "match CRITIAL label");
3142 if (gfc_statement_label != NULL)
3144 new_st.op = EXEC_NOP;
3150 unexpected_statement (st);
3154 while (st != ST_END_CRITICAL);
3157 accept_statement (st);
3161 /* Set up the local namespace for a BLOCK construct. */
3164 gfc_build_block_ns (gfc_namespace *parent_ns)
3166 gfc_namespace* my_ns;
3167 static int numblock = 1;
3169 my_ns = gfc_get_namespace (parent_ns, 1);
3170 my_ns->construct_entities = 1;
3172 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3173 code generation (so it must not be NULL).
3174 We set its recursive argument if our container procedure is recursive, so
3175 that local variables are accordingly placed on the stack when it
3176 will be necessary. */
3178 my_ns->proc_name = gfc_new_block;
3182 char buffer[20]; /* Enough to hold "block@2147483648\n". */
3184 snprintf(buffer, sizeof(buffer), "block@%d", numblock++);
3185 gfc_get_symbol (buffer, my_ns, &my_ns->proc_name);
3186 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3187 my_ns->proc_name->name, NULL);
3188 gcc_assert (t == SUCCESS);
3189 gfc_commit_symbol (my_ns->proc_name);
3192 if (parent_ns->proc_name)
3193 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3199 /* Parse a BLOCK construct. */
3202 parse_block_construct (void)
3204 gfc_namespace* my_ns;
3207 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BLOCK construct at %C");
3209 my_ns = gfc_build_block_ns (gfc_current_ns);
3211 new_st.op = EXEC_BLOCK;
3212 new_st.ext.block.ns = my_ns;
3213 new_st.ext.block.assoc = NULL;
3214 accept_statement (ST_BLOCK);
3216 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3217 gfc_current_ns = my_ns;
3219 parse_progunit (ST_NONE);
3221 gfc_current_ns = gfc_current_ns->parent;
3226 /* Parse an ASSOCIATE construct. This is essentially a BLOCK construct
3227 behind the scenes with compiler-generated variables. */
3230 parse_associate (void)
3232 gfc_namespace* my_ns;
3235 gfc_association_list* a;
3237 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASSOCIATE construct at %C");
3239 my_ns = gfc_build_block_ns (gfc_current_ns);
3241 new_st.op = EXEC_BLOCK;
3242 new_st.ext.block.ns = my_ns;
3243 gcc_assert (new_st.ext.block.assoc);
3245 /* Add all associate-names as BLOCK variables. Creating them is enough
3246 for now, they'll get their values during trans-* phase. */
3247 gfc_current_ns = my_ns;
3248 for (a = new_st.ext.block.assoc; a; a = a->next)
3252 if (gfc_get_sym_tree (a->name, NULL, &a->st, false))
3256 sym->attr.flavor = FL_VARIABLE;
3258 sym->declared_at = a->where;
3259 gfc_set_sym_referenced (sym);
3261 /* Initialize the typespec. It is not available in all cases,
3262 however, as it may only be set on the target during resolution.
3263 Still, sometimes it helps to have it right now -- especially
3264 for parsing component references on the associate-name
3265 in case of assication to a derived-type. */
3266 sym->ts = a->target->ts;
3269 accept_statement (ST_ASSOCIATE);
3270 push_state (&s, COMP_ASSOCIATE, my_ns->proc_name);
3273 st = parse_executable (ST_NONE);
3280 accept_statement (st);
3281 my_ns->code = gfc_state_stack->head;
3285 unexpected_statement (st);
3289 gfc_current_ns = gfc_current_ns->parent;
3294 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3295 handled inside of parse_executable(), because they aren't really
3299 parse_do_block (void)
3306 s.ext.end_do_label = new_st.label1;
3308 if (new_st.ext.iterator != NULL)
3309 stree = new_st.ext.iterator->var->symtree;
3313 accept_statement (ST_DO);
3315 top = gfc_state_stack->tail;
3316 push_state (&s, COMP_DO, gfc_new_block);
3318 s.do_variable = stree;
3320 top->block = new_level (top);
3321 top->block->op = EXEC_DO;
3324 st = parse_executable (ST_NONE);
3332 if (s.ext.end_do_label != NULL
3333 && s.ext.end_do_label != gfc_statement_label)
3334 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3337 if (gfc_statement_label != NULL)
3339 new_st.op = EXEC_NOP;
3344 case ST_IMPLIED_ENDDO:
3345 /* If the do-stmt of this DO construct has a do-construct-name,
3346 the corresponding end-do must be an end-do-stmt (with a matching
3347 name, but in that case we must have seen ST_ENDDO first).
3348 We only complain about this in pedantic mode. */
3349 if (gfc_current_block () != NULL)
3350 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3351 &gfc_current_block()->declared_at);
3356 unexpected_statement (st);
3361 accept_statement (st);
3365 /* Parse the statements of OpenMP do/parallel do. */
3367 static gfc_statement
3368 parse_omp_do (gfc_statement omp_st)
3374 accept_statement (omp_st);
3376 cp = gfc_state_stack->tail;
3377 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3378 np = new_level (cp);
3384 st = next_statement ();
3387 else if (st == ST_DO)
3390 unexpected_statement (st);
3394 if (gfc_statement_label != NULL
3395 && gfc_state_stack->previous != NULL
3396 && gfc_state_stack->previous->state == COMP_DO
3397 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3405 there should be no !$OMP END DO. */
3407 return ST_IMPLIED_ENDDO;
3410 check_do_closure ();
3413 st = next_statement ();
3414 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3416 if (new_st.op == EXEC_OMP_END_NOWAIT)
3417 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3419 gcc_assert (new_st.op == EXEC_NOP);
3420 gfc_clear_new_st ();
3421 gfc_commit_symbols ();
3422 gfc_warning_check ();
3423 st = next_statement ();
3429 /* Parse the statements of OpenMP atomic directive. */
3431 static gfc_statement
3432 parse_omp_atomic (void)
3439 accept_statement (ST_OMP_ATOMIC);
3441 cp = gfc_state_stack->tail;
3442 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3443 np = new_level (cp);
3446 count = 1 + (cp->ext.omp_atomic == GFC_OMP_ATOMIC_CAPTURE);
3450 st = next_statement ();
3453 else if (st == ST_ASSIGNMENT)
3455 accept_statement (st);
3459 unexpected_statement (st);
3464 st = next_statement ();
3465 if (st == ST_OMP_END_ATOMIC)
3467 gfc_clear_new_st ();
3468 gfc_commit_symbols ();
3469 gfc_warning_check ();
3470 st = next_statement ();
3472 else if (cp->ext.omp_atomic == GFC_OMP_ATOMIC_CAPTURE)
3473 gfc_error ("Missing !$OMP END ATOMIC after !$OMP ATOMIC CAPTURE at %C");
3478 /* Parse the statements of an OpenMP structured block. */
3481 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3483 gfc_statement st, omp_end_st;
3487 accept_statement (omp_st);
3489 cp = gfc_state_stack->tail;
3490 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3491 np = new_level (cp);
3497 case ST_OMP_PARALLEL:
3498 omp_end_st = ST_OMP_END_PARALLEL;
3500 case ST_OMP_PARALLEL_SECTIONS:
3501 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3503 case ST_OMP_SECTIONS:
3504 omp_end_st = ST_OMP_END_SECTIONS;
3506 case ST_OMP_ORDERED:
3507 omp_end_st = ST_OMP_END_ORDERED;
3509 case ST_OMP_CRITICAL:
3510 omp_end_st = ST_OMP_END_CRITICAL;
3513 omp_end_st = ST_OMP_END_MASTER;
3516 omp_end_st = ST_OMP_END_SINGLE;
3519 omp_end_st = ST_OMP_END_TASK;
3521 case ST_OMP_WORKSHARE:
3522 omp_end_st = ST_OMP_END_WORKSHARE;
3524 case ST_OMP_PARALLEL_WORKSHARE:
3525 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3533 if (workshare_stmts_only)
3535 /* Inside of !$omp workshare, only
3538 where statements and constructs
3539 forall statements and constructs
3543 are allowed. For !$omp critical these
3544 restrictions apply recursively. */
3547 st = next_statement ();
3558 accept_statement (st);
3561 case ST_WHERE_BLOCK:
3562 parse_where_block ();
3565 case ST_FORALL_BLOCK:
3566 parse_forall_block ();
3569 case ST_OMP_PARALLEL:
3570 case ST_OMP_PARALLEL_SECTIONS:
3571 parse_omp_structured_block (st, false);
3574 case ST_OMP_PARALLEL_WORKSHARE:
3575 case ST_OMP_CRITICAL:
3576 parse_omp_structured_block (st, true);
3579 case ST_OMP_PARALLEL_DO:
3580 st = parse_omp_do (st);
3584 st = parse_omp_atomic ();
3595 st = next_statement ();
3599 st = parse_executable (ST_NONE);
3602 else if (st == ST_OMP_SECTION
3603 && (omp_st == ST_OMP_SECTIONS
3604 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3606 np = new_level (np);
3610 else if (st != omp_end_st)
3611 unexpected_statement (st);
3613 while (st != omp_end_st);
3617 case EXEC_OMP_END_NOWAIT:
3618 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3620 case EXEC_OMP_CRITICAL:
3621 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3622 || (new_st.ext.omp_name != NULL
3623 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3624 gfc_error ("Name after !$omp critical and !$omp end critical does "
3626 free (CONST_CAST (char *, new_st.ext.omp_name));
3628 case EXEC_OMP_END_SINGLE:
3629 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3630 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3631 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3632 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3640 gfc_clear_new_st ();
3641 gfc_commit_symbols ();
3642 gfc_warning_check ();
3647 /* Accept a series of executable statements. We return the first
3648 statement that doesn't fit to the caller. Any block statements are
3649 passed on to the correct handler, which usually passes the buck
3652 static gfc_statement
3653 parse_executable (gfc_statement st)
3658 st = next_statement ();
3662 close_flag = check_do_closure ();
3667 case ST_END_PROGRAM:
3670 case ST_END_FUNCTION:
3675 case ST_END_SUBROUTINE:
3680 case ST_SELECT_CASE:
3681 gfc_error ("%s statement at %C cannot terminate a non-block "
3682 "DO loop", gfc_ascii_statement (st));
3698 accept_statement (st);
3699 if (close_flag == 1)
3700 return ST_IMPLIED_ENDDO;
3704 parse_block_construct ();
3715 case ST_SELECT_CASE:
3716 parse_select_block ();
3719 case ST_SELECT_TYPE:
3720 parse_select_type_block();
3725 if (check_do_closure () == 1)
3726 return ST_IMPLIED_ENDDO;
3730 parse_critical_block ();
3733 case ST_WHERE_BLOCK:
3734 parse_where_block ();
3737 case ST_FORALL_BLOCK:
3738 parse_forall_block ();
3741 case ST_OMP_PARALLEL:
3742 case ST_OMP_PARALLEL_SECTIONS:
3743 case ST_OMP_SECTIONS:
3744 case ST_OMP_ORDERED:
3745 case ST_OMP_CRITICAL:
3749 parse_omp_structured_block (st, false);
3752 case ST_OMP_WORKSHARE:
3753 case ST_OMP_PARALLEL_WORKSHARE:
3754 parse_omp_structured_block (st, true);
3758 case ST_OMP_PARALLEL_DO:
3759 st = parse_omp_do (st);
3760 if (st == ST_IMPLIED_ENDDO)
3765 st = parse_omp_atomic ();
3772 st = next_statement ();
3777 /* Fix the symbols for sibling functions. These are incorrectly added to
3778 the child namespace as the parser didn't know about this procedure. */
3781 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3785 gfc_symbol *old_sym;
3787 sym->attr.referenced = 1;
3788 for (ns = siblings; ns; ns = ns->sibling)
3790 st = gfc_find_symtree (ns->sym_root, sym->name);
3792 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3793 goto fixup_contained;
3795 old_sym = st->n.sym;
3796 if (old_sym->ns == ns
3797 && !old_sym->attr.contained
3799 /* By 14.6.1.3, host association should be excluded
3800 for the following. */
3801 && !(old_sym->attr.external
3802 || (old_sym->ts.type != BT_UNKNOWN
3803 && !old_sym->attr.implicit_type)
3804 || old_sym->attr.flavor == FL_PARAMETER
3805 || old_sym->attr.use_assoc
3806 || old_sym->attr.in_common
3807 || old_sym->attr.in_equivalence
3808 || old_sym->attr.data
3809 || old_sym->attr.dummy
3810 || old_sym->attr.result
3811 || old_sym->attr.dimension
3812 || old_sym->attr.allocatable
3813 || old_sym->attr.intrinsic
3814 || old_sym->attr.generic
3815 || old_sym->attr.flavor == FL_NAMELIST
3816 || old_sym->attr.proc == PROC_ST_FUNCTION))
3818 /* Replace it with the symbol from the parent namespace. */
3822 gfc_release_symbol (old_sym);
3826 /* Do the same for any contained procedures. */
3827 gfc_fixup_sibling_symbols (sym, ns->contained);
3832 parse_contained (int module)
3834 gfc_namespace *ns, *parent_ns, *tmp;
3835 gfc_state_data s1, s2;
3839 int contains_statements = 0;
3842 push_state (&s1, COMP_CONTAINS, NULL);
3843 parent_ns = gfc_current_ns;
3847 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3849 gfc_current_ns->sibling = parent_ns->contained;
3850 parent_ns->contained = gfc_current_ns;
3853 /* Process the next available statement. We come here if we got an error
3854 and rejected the last statement. */
3855 st = next_statement ();
3864 contains_statements = 1;
3865 accept_statement (st);
3868 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3871 /* For internal procedures, create/update the symbol in the
3872 parent namespace. */
3876 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3877 gfc_error ("Contained procedure '%s' at %C is already "
3878 "ambiguous", gfc_new_block->name);
3881 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3882 &gfc_new_block->declared_at) ==
3885 if (st == ST_FUNCTION)
3886 gfc_add_function (&sym->attr, sym->name,
3887 &gfc_new_block->declared_at);
3889 gfc_add_subroutine (&sym->attr, sym->name,
3890 &gfc_new_block->declared_at);
3894 gfc_commit_symbols ();
3897 sym = gfc_new_block;
3899 /* Mark this as a contained function, so it isn't replaced
3900 by other module functions. */
3901 sym->attr.contained = 1;
3902 sym->attr.referenced = 1;
3904 /* Set implicit_pure so that it can be reset if any of the
3905 tests for purity fail. This is used for some optimisation
3906 during translation. */
3907 if (!sym->attr.pure)
3908 sym->attr.implicit_pure = 1;
3910 parse_progunit (ST_NONE);
3912 /* Fix up any sibling functions that refer to this one. */
3913 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3914 /* Or refer to any of its alternate entry points. */
3915 for (el = gfc_current_ns->entries; el; el = el->next)
3916 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3918 gfc_current_ns->code = s2.head;
3919 gfc_current_ns = parent_ns;
3924 /* These statements are associated with the end of the host unit. */
3925 case ST_END_FUNCTION:
3927 case ST_END_PROGRAM:
3928 case ST_END_SUBROUTINE:
3929 accept_statement (st);
3933 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3934 gfc_ascii_statement (st));
3935 reject_statement ();
3941 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3942 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3944 /* The first namespace in the list is guaranteed to not have
3945 anything (worthwhile) in it. */
3946 tmp = gfc_current_ns;
3947 gfc_current_ns = parent_ns;
3948 if (seen_error && tmp->refs > 1)
3949 gfc_free_namespace (tmp);
3951 ns = gfc_current_ns->contained;
3952 gfc_current_ns->contained = ns->sibling;
3953 gfc_free_namespace (ns);
3956 if (!contains_statements)
3957 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3958 "FUNCTION or SUBROUTINE statement at %C");
3962 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
3965 parse_progunit (gfc_statement st)
3970 st = parse_spec (st);
3977 /* This is not allowed within BLOCK! */
3978 if (gfc_current_state () != COMP_BLOCK)
3983 accept_statement (st);
3990 if (gfc_current_state () == COMP_FUNCTION)
3991 gfc_check_function_type (gfc_current_ns);
3996 st = parse_executable (st);
4004 /* This is not allowed within BLOCK! */
4005 if (gfc_current_state () != COMP_BLOCK)
4010 accept_statement (st);
4017 unexpected_statement (st);
4018 reject_statement ();
4019 st = next_statement ();
4025 for (p = gfc_state_stack; p; p = p->previous)
4026 if (p->state == COMP_CONTAINS)
4029 if (gfc_find_state (COMP_MODULE) == SUCCESS)
4034 gfc_error ("CONTAINS statement at %C is already in a contained "
4036 reject_statement ();
4037 st = next_statement ();
4041 parse_contained (0);
4044 gfc_current_ns->code = gfc_state_stack->head;
4048 /* Come here to complain about a global symbol already in use as
4052 gfc_global_used (gfc_gsymbol *sym, locus *where)
4057 where = &gfc_current_locus;
4067 case GSYM_SUBROUTINE:
4068 name = "SUBROUTINE";
4073 case GSYM_BLOCK_DATA:
4074 name = "BLOCK DATA";
4080 gfc_internal_error ("gfc_global_used(): Bad type");
4084 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
4085 sym->name, where, name, &sym->where);
4089 /* Parse a block data program unit. */
4092 parse_block_data (void)
4095 static locus blank_locus;
4096 static int blank_block=0;
4099 gfc_current_ns->proc_name = gfc_new_block;
4100 gfc_current_ns->is_block_data = 1;
4102 if (gfc_new_block == NULL)
4105 gfc_error ("Blank BLOCK DATA at %C conflicts with "
4106 "prior BLOCK DATA at %L", &blank_locus);
4110 blank_locus = gfc_current_locus;
4115 s = gfc_get_gsymbol (gfc_new_block->name);
4117 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
4118 gfc_global_used(s, NULL);
4121 s->type = GSYM_BLOCK_DATA;
4122 s->where = gfc_current_locus;
4127 st = parse_spec (ST_NONE);
4129 while (st != ST_END_BLOCK_DATA)
4131 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
4132 gfc_ascii_statement (st));
4133 reject_statement ();
4134 st = next_statement ();
4139 /* Parse a module subprogram. */
4147 s = gfc_get_gsymbol (gfc_new_block->name);
4148 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4149 gfc_global_used(s, NULL);
4152 s->type = GSYM_MODULE;
4153 s->where = gfc_current_locus;
4157 st = parse_spec (ST_NONE);
4166 parse_contained (1);
4170 accept_statement (st);
4174 gfc_error ("Unexpected %s statement in MODULE at %C",
4175 gfc_ascii_statement (st));
4177 reject_statement ();
4178 st = next_statement ();
4182 s->ns = gfc_current_ns;
4186 /* Add a procedure name to the global symbol table. */
4189 add_global_procedure (int sub)
4193 s = gfc_get_gsymbol(gfc_new_block->name);
4196 || (s->type != GSYM_UNKNOWN
4197 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4198 gfc_global_used(s, NULL);
4201 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4202 s->where = gfc_current_locus;
4204 s->ns = gfc_current_ns;
4209 /* Add a program to the global symbol table. */
4212 add_global_program (void)
4216 if (gfc_new_block == NULL)
4218 s = gfc_get_gsymbol (gfc_new_block->name);
4220 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4221 gfc_global_used(s, NULL);
4224 s->type = GSYM_PROGRAM;
4225 s->where = gfc_current_locus;
4227 s->ns = gfc_current_ns;
4232 /* Resolve all the program units when whole file scope option
4235 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4237 gfc_free_dt_list ();
4238 gfc_current_ns = gfc_global_ns_list;
4239 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4241 if (gfc_current_ns->proc_name
4242 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4243 continue; /* Already resolved. */
4245 if (gfc_current_ns->proc_name)
4246 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4247 gfc_resolve (gfc_current_ns);
4248 gfc_current_ns->derived_types = gfc_derived_types;
4249 gfc_derived_types = NULL;
4255 clean_up_modules (gfc_gsymbol *gsym)
4260 clean_up_modules (gsym->left);
4261 clean_up_modules (gsym->right);
4263 if (gsym->type != GSYM_MODULE || !gsym->ns)
4266 gfc_current_ns = gsym->ns;
4267 gfc_derived_types = gfc_current_ns->derived_types;
4274 /* Translate all the program units when whole file scope option
4275 is active. This could be in a different order to resolution if
4276 there are forward references in the file. */
4278 translate_all_program_units (gfc_namespace *gfc_global_ns_list,
4283 gfc_current_ns = gfc_global_ns_list;
4284 gfc_get_errors (NULL, &errors);
4286 /* If the main program is in the translation unit and we have
4287 -fcoarray=libs, generate the static variables. */
4288 if (gfc_option.coarray == GFC_FCOARRAY_LIB && main_in_tu)
4289 gfc_init_coarray_decl (true);
4291 /* We first translate all modules to make sure that later parts
4292 of the program can use the decl. Then we translate the nonmodules. */
4294 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4296 if (!gfc_current_ns->proc_name
4297 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4300 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4301 gfc_derived_types = gfc_current_ns->derived_types;
4302 gfc_generate_module_code (gfc_current_ns);
4303 gfc_current_ns->translated = 1;
4306 gfc_current_ns = gfc_global_ns_list;
4307 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4309 if (gfc_current_ns->proc_name
4310 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4313 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4314 gfc_derived_types = gfc_current_ns->derived_types;
4315 gfc_generate_code (gfc_current_ns);
4316 gfc_current_ns->translated = 1;
4319 /* Clean up all the namespaces after translation. */
4320 gfc_current_ns = gfc_global_ns_list;
4321 for (;gfc_current_ns;)
4325 if (gfc_current_ns->proc_name
4326 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4328 gfc_current_ns = gfc_current_ns->sibling;
4332 ns = gfc_current_ns->sibling;
4333 gfc_derived_types = gfc_current_ns->derived_types;
4335 gfc_current_ns = ns;
4338 clean_up_modules (gfc_gsym_root);
4342 /* Top level parser. */
4345 gfc_parse_file (void)
4347 int seen_program, errors_before, errors;
4348 gfc_state_data top, s;
4351 gfc_namespace *next;
4353 gfc_start_source_files ();
4355 top.state = COMP_NONE;
4357 top.previous = NULL;
4358 top.head = top.tail = NULL;
4359 top.do_variable = NULL;
4361 gfc_state_stack = ⊤
4363 gfc_clear_new_st ();
4365 gfc_statement_label = NULL;
4367 if (setjmp (eof_buf))
4368 return FAILURE; /* Come here on unexpected EOF */
4370 /* Prepare the global namespace that will contain the
4372 gfc_global_ns_list = next = NULL;
4376 /* Exit early for empty files. */
4382 st = next_statement ();
4391 goto duplicate_main;
4393 prog_locus = gfc_current_locus;
4395 push_state (&s, COMP_PROGRAM, gfc_new_block);
4396 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4397 accept_statement (st);
4398 add_global_program ();
4399 parse_progunit (ST_NONE);
4400 if (gfc_option.flag_whole_file)
4405 add_global_procedure (1);
4406 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4407 accept_statement (st);
4408 parse_progunit (ST_NONE);
4409 if (gfc_option.flag_whole_file)
4414 add_global_procedure (0);
4415 push_state (&s, COMP_FUNCTION, gfc_new_block);
4416 accept_statement (st);
4417 parse_progunit (ST_NONE);
4418 if (gfc_option.flag_whole_file)
4423 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4424 accept_statement (st);
4425 parse_block_data ();
4429 push_state (&s, COMP_MODULE, gfc_new_block);
4430 accept_statement (st);
4432 gfc_get_errors (NULL, &errors_before);
4436 /* Anything else starts a nameless main program block. */
4439 goto duplicate_main;
4441 prog_locus = gfc_current_locus;
4443 push_state (&s, COMP_PROGRAM, gfc_new_block);
4444 main_program_symbol (gfc_current_ns, "MAIN__");
4445 parse_progunit (st);
4446 if (gfc_option.flag_whole_file)
4451 /* Handle the non-program units. */
4452 gfc_current_ns->code = s.head;
4454 gfc_resolve (gfc_current_ns);
4456 /* Dump the parse tree if requested. */
4457 if (gfc_option.dump_fortran_original)
4458 gfc_dump_parse_tree (gfc_current_ns, stdout);
4460 gfc_get_errors (NULL, &errors);
4461 if (s.state == COMP_MODULE)
4463 gfc_dump_module (s.sym->name, errors_before == errors);
4464 if (!gfc_option.flag_whole_file)
4467 gfc_generate_module_code (gfc_current_ns);
4473 gfc_current_ns->derived_types = gfc_derived_types;
4474 gfc_derived_types = NULL;
4481 gfc_generate_code (gfc_current_ns);
4489 /* The main program and non-contained procedures are put
4490 in the global namespace list, so that they can be processed
4491 later and all their interfaces resolved. */
4492 gfc_current_ns->code = s.head;
4495 for (; next->sibling; next = next->sibling)
4497 next->sibling = gfc_current_ns;
4500 gfc_global_ns_list = gfc_current_ns;
4502 next = gfc_current_ns;
4509 if (!gfc_option.flag_whole_file)
4512 /* Do the resolution. */
4513 resolve_all_program_units (gfc_global_ns_list);
4515 /* Do the parse tree dump. */
4517 = gfc_option.dump_fortran_original ? gfc_global_ns_list : NULL;
4519 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4520 if (!gfc_current_ns->proc_name
4521 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4523 gfc_dump_parse_tree (gfc_current_ns, stdout);
4524 fputs ("------------------------------------------\n\n", stdout);
4527 /* Do the translation. */
4528 translate_all_program_units (gfc_global_ns_list, seen_program);
4532 gfc_end_source_files ();
4536 /* If we see a duplicate main program, shut down. If the second
4537 instance is an implied main program, i.e. data decls or executable
4538 statements, we're in for lots of errors. */
4539 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4540 reject_statement ();