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 critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
530 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
531 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
532 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
533 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
534 match ("end parallel sections", gfc_match_omp_eos,
535 ST_OMP_END_PARALLEL_SECTIONS);
536 match ("end parallel workshare", gfc_match_omp_eos,
537 ST_OMP_END_PARALLEL_WORKSHARE);
538 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
539 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
540 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
541 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
542 match ("end workshare", gfc_match_omp_end_nowait,
543 ST_OMP_END_WORKSHARE);
546 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
549 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
552 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
555 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
556 match ("parallel sections", gfc_match_omp_parallel_sections,
557 ST_OMP_PARALLEL_SECTIONS);
558 match ("parallel workshare", gfc_match_omp_parallel_workshare,
559 ST_OMP_PARALLEL_WORKSHARE);
560 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
563 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
564 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
565 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
568 match ("task", gfc_match_omp_task, ST_OMP_TASK);
569 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
570 match ("threadprivate", gfc_match_omp_threadprivate,
571 ST_OMP_THREADPRIVATE);
573 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
577 /* All else has failed, so give up. See if any of the matchers has
578 stored an error message of some sort. */
580 if (gfc_error_check () == 0)
581 gfc_error_now ("Unclassifiable OpenMP directive at %C");
585 gfc_error_recovery ();
591 decode_gcc_attribute (void)
595 gfc_enforce_clean_symbol_state ();
597 gfc_clear_error (); /* Clear any pending errors. */
598 gfc_clear_warning (); /* Clear any pending warnings. */
599 old_locus = gfc_current_locus;
601 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
603 /* All else has failed, so give up. See if any of the matchers has
604 stored an error message of some sort. */
606 if (gfc_error_check () == 0)
607 gfc_error_now ("Unclassifiable GCC directive at %C");
611 gfc_error_recovery ();
619 /* Get the next statement in free form source. */
628 at_bol = gfc_at_bol ();
629 gfc_gobble_whitespace ();
631 c = gfc_peek_ascii_char ();
637 /* Found a statement label? */
638 m = gfc_match_st_label (&gfc_statement_label);
640 d = gfc_peek_ascii_char ();
641 if (m != MATCH_YES || !gfc_is_whitespace (d))
643 gfc_match_small_literal_int (&i, &cnt);
646 gfc_error_now ("Too many digits in statement label at %C");
649 gfc_error_now ("Zero is not a valid statement label at %C");
652 c = gfc_next_ascii_char ();
655 if (!gfc_is_whitespace (c))
656 gfc_error_now ("Non-numeric character in statement label at %C");
662 label_locus = gfc_current_locus;
664 gfc_gobble_whitespace ();
666 if (at_bol && gfc_peek_ascii_char () == ';')
668 gfc_error_now ("Semicolon at %C needs to be preceded by "
670 gfc_next_ascii_char (); /* Eat up the semicolon. */
674 if (gfc_match_eos () == MATCH_YES)
676 gfc_warning_now ("Ignoring statement label in empty statement "
677 "at %L", &label_locus);
678 gfc_free_st_label (gfc_statement_label);
679 gfc_statement_label = NULL;
686 /* Comments have already been skipped by the time we get here,
687 except for GCC attributes and OpenMP directives. */
689 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
690 c = gfc_peek_ascii_char ();
696 c = gfc_next_ascii_char ();
697 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
698 gcc_assert (c == "gcc$"[i]);
700 gfc_gobble_whitespace ();
701 return decode_gcc_attribute ();
704 else if (c == '$' && gfc_option.gfc_flag_openmp)
708 c = gfc_next_ascii_char ();
709 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
710 gcc_assert (c == "$omp"[i]);
712 gcc_assert (c == ' ' || c == '\t');
713 gfc_gobble_whitespace ();
714 return decode_omp_directive ();
720 if (at_bol && c == ';')
722 if (!(gfc_option.allow_std & GFC_STD_F2008))
723 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
725 gfc_next_ascii_char (); /* Eat up the semicolon. */
729 return decode_statement ();
733 /* Get the next statement in fixed-form source. */
738 int label, digit_flag, i;
743 return decode_statement ();
745 /* Skip past the current label field, parsing a statement label if
746 one is there. This is a weird number parser, since the number is
747 contained within five columns and can have any kind of embedded
748 spaces. We also check for characters that make the rest of the
754 for (i = 0; i < 5; i++)
756 c = gfc_next_char_literal (NONSTRING);
773 label = label * 10 + ((unsigned char) c - '0');
774 label_locus = gfc_current_locus;
778 /* Comments have already been skipped by the time we get
779 here, except for GCC attributes and OpenMP directives. */
782 c = gfc_next_char_literal (NONSTRING);
784 if (TOLOWER (c) == 'g')
786 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
787 gcc_assert (TOLOWER (c) == "gcc$"[i]);
789 return decode_gcc_attribute ();
791 else if (c == '$' && gfc_option.gfc_flag_openmp)
793 for (i = 0; i < 4; i++, c = gfc_next_char_literal (NONSTRING))
794 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
796 if (c != ' ' && c != '0')
798 gfc_buffer_error (0);
799 gfc_error ("Bad continuation line at %C");
803 return decode_omp_directive ();
807 /* Comments have already been skipped by the time we get
808 here so don't bother checking for them. */
811 gfc_buffer_error (0);
812 gfc_error ("Non-numeric character in statement label at %C");
820 gfc_warning_now ("Zero is not a valid statement label at %C");
823 /* We've found a valid statement label. */
824 gfc_statement_label = gfc_get_st_label (label);
828 /* Since this line starts a statement, it cannot be a continuation
829 of a previous statement. If we see something here besides a
830 space or zero, it must be a bad continuation line. */
832 c = gfc_next_char_literal (NONSTRING);
836 if (c != ' ' && c != '0')
838 gfc_buffer_error (0);
839 gfc_error ("Bad continuation line at %C");
843 /* Now that we've taken care of the statement label columns, we have
844 to make sure that the first nonblank character is not a '!'. If
845 it is, the rest of the line is a comment. */
849 loc = gfc_current_locus;
850 c = gfc_next_char_literal (NONSTRING);
852 while (gfc_is_whitespace (c));
856 gfc_current_locus = loc;
861 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
862 else if (!(gfc_option.allow_std & GFC_STD_F2008))
863 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
868 if (gfc_match_eos () == MATCH_YES)
871 /* At this point, we've got a nonblank statement to parse. */
872 return decode_statement ();
876 gfc_warning_now ("Ignoring statement label in empty statement at %L",
879 gfc_current_locus.lb->truncated = 0;
885 /* Return the next non-ST_NONE statement to the caller. We also worry
886 about including files and the ends of include files at this stage. */
889 next_statement (void)
894 gfc_enforce_clean_symbol_state ();
896 gfc_new_block = NULL;
898 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
899 gfc_current_ns->old_equiv = gfc_current_ns->equiv;
902 gfc_statement_label = NULL;
903 gfc_buffer_error (1);
908 gfc_skip_comments ();
916 if (gfc_define_undef_line ())
919 old_locus = gfc_current_locus;
921 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
927 gfc_buffer_error (0);
929 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
931 gfc_free_st_label (gfc_statement_label);
932 gfc_statement_label = NULL;
933 gfc_current_locus = old_locus;
937 check_statement_label (st);
943 /****************************** Parser ***********************************/
945 /* The parser subroutines are of type 'try' that fail if the file ends
948 /* Macros that expand to case-labels for various classes of
949 statements. Start with executable statements that directly do
952 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
953 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
954 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
955 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
956 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
957 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
958 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
959 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
960 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT: case ST_ERROR_STOP: \
961 case ST_SYNC_ALL: case ST_SYNC_IMAGES: case ST_SYNC_MEMORY: \
962 case ST_LOCK: case ST_UNLOCK
964 /* Statements that mark other executable statements. */
966 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: \
967 case ST_IF_BLOCK: case ST_BLOCK: case ST_ASSOCIATE: \
968 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_SELECT_TYPE: \
969 case ST_OMP_PARALLEL: \
970 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
971 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
972 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
973 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
974 case ST_OMP_TASK: case ST_CRITICAL
976 /* Declaration statements */
978 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
979 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
980 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
983 /* Block end statements. Errors associated with interchanging these
984 are detected in gfc_match_end(). */
986 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
987 case ST_END_PROGRAM: case ST_END_SUBROUTINE: \
988 case ST_END_BLOCK: case ST_END_ASSOCIATE
991 /* Push a new state onto the stack. */
994 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
996 p->state = new_state;
997 p->previous = gfc_state_stack;
999 p->head = p->tail = NULL;
1000 p->do_variable = NULL;
1002 /* If this the state of a construct like BLOCK, DO or IF, the corresponding
1003 construct statement was accepted right before pushing the state. Thus,
1004 the construct's gfc_code is available as tail of the parent state. */
1005 gcc_assert (gfc_state_stack);
1006 p->construct = gfc_state_stack->tail;
1008 gfc_state_stack = p;
1012 /* Pop the current state. */
1016 gfc_state_stack = gfc_state_stack->previous;
1020 /* Try to find the given state in the state stack. */
1023 gfc_find_state (gfc_compile_state state)
1027 for (p = gfc_state_stack; p; p = p->previous)
1028 if (p->state == state)
1031 return (p == NULL) ? FAILURE : SUCCESS;
1035 /* Starts a new level in the statement list. */
1038 new_level (gfc_code *q)
1042 p = q->block = gfc_get_code ();
1044 gfc_state_stack->head = gfc_state_stack->tail = p;
1050 /* Add the current new_st code structure and adds it to the current
1051 program unit. As a side-effect, it zeroes the new_st. */
1054 add_statement (void)
1058 p = gfc_get_code ();
1061 p->loc = gfc_current_locus;
1063 if (gfc_state_stack->head == NULL)
1064 gfc_state_stack->head = p;
1066 gfc_state_stack->tail->next = p;
1068 while (p->next != NULL)
1071 gfc_state_stack->tail = p;
1073 gfc_clear_new_st ();
1079 /* Frees everything associated with the current statement. */
1082 undo_new_statement (void)
1084 gfc_free_statements (new_st.block);
1085 gfc_free_statements (new_st.next);
1086 gfc_free_statement (&new_st);
1087 gfc_clear_new_st ();
1091 /* If the current statement has a statement label, make sure that it
1092 is allowed to, or should have one. */
1095 check_statement_label (gfc_statement st)
1099 if (gfc_statement_label == NULL)
1101 if (st == ST_FORMAT)
1102 gfc_error ("FORMAT statement at %L does not have a statement label",
1109 case ST_END_PROGRAM:
1110 case ST_END_FUNCTION:
1111 case ST_END_SUBROUTINE:
1115 case ST_END_CRITICAL:
1118 type = ST_LABEL_TARGET;
1122 type = ST_LABEL_FORMAT;
1125 /* Statement labels are not restricted from appearing on a
1126 particular line. However, there are plenty of situations
1127 where the resulting label can't be referenced. */
1130 type = ST_LABEL_BAD_TARGET;
1134 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1136 new_st.here = gfc_statement_label;
1140 /* Figures out what the enclosing program unit is. This will be a
1141 function, subroutine, program, block data or module. */
1144 gfc_enclosing_unit (gfc_compile_state * result)
1148 for (p = gfc_state_stack; p; p = p->previous)
1149 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1150 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1151 || p->state == COMP_PROGRAM)
1160 *result = COMP_PROGRAM;
1165 /* Translate a statement enum to a string. */
1168 gfc_ascii_statement (gfc_statement st)
1174 case ST_ARITHMETIC_IF:
1175 p = _("arithmetic IF");
1184 p = _("attribute declaration");
1220 p = _("data declaration");
1228 case ST_DERIVED_DECL:
1229 p = _("derived type declaration");
1243 case ST_END_ASSOCIATE:
1244 p = "END ASSOCIATE";
1249 case ST_END_BLOCK_DATA:
1250 p = "END BLOCK DATA";
1252 case ST_END_CRITICAL:
1264 case ST_END_FUNCTION:
1270 case ST_END_INTERFACE:
1271 p = "END INTERFACE";
1276 case ST_END_PROGRAM:
1282 case ST_END_SUBROUTINE:
1283 p = "END SUBROUTINE";
1294 case ST_EQUIVALENCE:
1306 case ST_FORALL_BLOCK: /* Fall through */
1328 case ST_IMPLICIT_NONE:
1329 p = "IMPLICIT NONE";
1331 case ST_IMPLIED_ENDDO:
1332 p = _("implied END DO");
1361 case ST_MODULE_PROC:
1362 p = "MODULE PROCEDURE";
1394 case ST_SYNC_IMAGES:
1397 case ST_SYNC_MEMORY:
1412 case ST_WHERE_BLOCK: /* Fall through */
1423 p = _("assignment");
1425 case ST_POINTER_ASSIGNMENT:
1426 p = _("pointer assignment");
1428 case ST_SELECT_CASE:
1431 case ST_SELECT_TYPE:
1446 case ST_STATEMENT_FUNCTION:
1447 p = "STATEMENT FUNCTION";
1449 case ST_LABEL_ASSIGNMENT:
1450 p = "LABEL ASSIGNMENT";
1453 p = "ENUM DEFINITION";
1456 p = "ENUMERATOR DEFINITION";
1464 case ST_OMP_BARRIER:
1465 p = "!$OMP BARRIER";
1467 case ST_OMP_CRITICAL:
1468 p = "!$OMP CRITICAL";
1473 case ST_OMP_END_CRITICAL:
1474 p = "!$OMP END CRITICAL";
1479 case ST_OMP_END_MASTER:
1480 p = "!$OMP END MASTER";
1482 case ST_OMP_END_ORDERED:
1483 p = "!$OMP END ORDERED";
1485 case ST_OMP_END_PARALLEL:
1486 p = "!$OMP END PARALLEL";
1488 case ST_OMP_END_PARALLEL_DO:
1489 p = "!$OMP END PARALLEL DO";
1491 case ST_OMP_END_PARALLEL_SECTIONS:
1492 p = "!$OMP END PARALLEL SECTIONS";
1494 case ST_OMP_END_PARALLEL_WORKSHARE:
1495 p = "!$OMP END PARALLEL WORKSHARE";
1497 case ST_OMP_END_SECTIONS:
1498 p = "!$OMP END SECTIONS";
1500 case ST_OMP_END_SINGLE:
1501 p = "!$OMP END SINGLE";
1503 case ST_OMP_END_TASK:
1504 p = "!$OMP END TASK";
1506 case ST_OMP_END_WORKSHARE:
1507 p = "!$OMP END WORKSHARE";
1515 case ST_OMP_ORDERED:
1516 p = "!$OMP ORDERED";
1518 case ST_OMP_PARALLEL:
1519 p = "!$OMP PARALLEL";
1521 case ST_OMP_PARALLEL_DO:
1522 p = "!$OMP PARALLEL DO";
1524 case ST_OMP_PARALLEL_SECTIONS:
1525 p = "!$OMP PARALLEL SECTIONS";
1527 case ST_OMP_PARALLEL_WORKSHARE:
1528 p = "!$OMP PARALLEL WORKSHARE";
1530 case ST_OMP_SECTIONS:
1531 p = "!$OMP SECTIONS";
1533 case ST_OMP_SECTION:
1534 p = "!$OMP SECTION";
1542 case ST_OMP_TASKWAIT:
1543 p = "!$OMP TASKWAIT";
1545 case ST_OMP_THREADPRIVATE:
1546 p = "!$OMP THREADPRIVATE";
1548 case ST_OMP_WORKSHARE:
1549 p = "!$OMP WORKSHARE";
1552 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1559 /* Create a symbol for the main program and assign it to ns->proc_name. */
1562 main_program_symbol (gfc_namespace *ns, const char *name)
1564 gfc_symbol *main_program;
1565 symbol_attribute attr;
1567 gfc_get_symbol (name, ns, &main_program);
1568 gfc_clear_attr (&attr);
1569 attr.flavor = FL_PROGRAM;
1570 attr.proc = PROC_UNKNOWN;
1571 attr.subroutine = 1;
1572 attr.access = ACCESS_PUBLIC;
1573 attr.is_main_program = 1;
1574 main_program->attr = attr;
1575 main_program->declared_at = gfc_current_locus;
1576 ns->proc_name = main_program;
1577 gfc_commit_symbols ();
1581 /* Do whatever is necessary to accept the last statement. */
1584 accept_statement (gfc_statement st)
1592 case ST_IMPLICIT_NONE:
1593 gfc_set_implicit_none ();
1602 gfc_current_ns->proc_name = gfc_new_block;
1605 /* If the statement is the end of a block, lay down a special code
1606 that allows a branch to the end of the block from within the
1607 construct. IF and SELECT are treated differently from DO
1608 (where EXEC_NOP is added inside the loop) for two
1610 1. END DO has a meaning in the sense that after a GOTO to
1611 it, the loop counter must be increased.
1612 2. IF blocks and SELECT blocks can consist of multiple
1613 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1614 Putting the label before the END IF would make the jump
1615 from, say, the ELSE IF block to the END IF illegal. */
1619 case ST_END_CRITICAL:
1620 if (gfc_statement_label != NULL)
1622 new_st.op = EXEC_END_BLOCK;
1627 /* The end-of-program unit statements do not get the special
1628 marker and require a statement of some sort if they are a
1631 case ST_END_PROGRAM:
1632 case ST_END_FUNCTION:
1633 case ST_END_SUBROUTINE:
1634 if (gfc_statement_label != NULL)
1636 new_st.op = EXEC_RETURN;
1641 new_st.op = EXEC_END_PROCEDURE;
1657 gfc_commit_symbols ();
1658 gfc_warning_check ();
1659 gfc_clear_new_st ();
1663 /* Undo anything tentative that has been built for the current
1667 reject_statement (void)
1669 /* Revert to the previous charlen chain. */
1670 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1671 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1673 gfc_free_equiv_until (gfc_current_ns->equiv, gfc_current_ns->old_equiv);
1674 gfc_current_ns->equiv = gfc_current_ns->old_equiv;
1676 gfc_new_block = NULL;
1677 gfc_undo_symbols ();
1678 gfc_clear_warning ();
1679 undo_new_statement ();
1683 /* Generic complaint about an out of order statement. We also do
1684 whatever is necessary to clean up. */
1687 unexpected_statement (gfc_statement st)
1689 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1691 reject_statement ();
1695 /* Given the next statement seen by the matcher, make sure that it is
1696 in proper order with the last. This subroutine is initialized by
1697 calling it with an argument of ST_NONE. If there is a problem, we
1698 issue an error and return FAILURE. Otherwise we return SUCCESS.
1700 Individual parsers need to verify that the statements seen are
1701 valid before calling here, i.e., ENTRY statements are not allowed in
1702 INTERFACE blocks. The following diagram is taken from the standard:
1704 +---------------------------------------+
1705 | program subroutine function module |
1706 +---------------------------------------+
1708 +---------------------------------------+
1710 +---------------------------------------+
1712 | +-----------+------------------+
1713 | | parameter | implicit |
1714 | +-----------+------------------+
1715 | format | | derived type |
1716 | entry | parameter | interface |
1717 | | data | specification |
1718 | | | statement func |
1719 | +-----------+------------------+
1720 | | data | executable |
1721 +--------+-----------+------------------+
1723 +---------------------------------------+
1724 | internal module/subprogram |
1725 +---------------------------------------+
1727 +---------------------------------------+
1736 ORDER_IMPLICIT_NONE,
1744 enum state_order state;
1745 gfc_statement last_statement;
1751 verify_st_order (st_state *p, gfc_statement st, bool silent)
1757 p->state = ORDER_START;
1761 if (p->state > ORDER_USE)
1763 p->state = ORDER_USE;
1767 if (p->state > ORDER_IMPORT)
1769 p->state = ORDER_IMPORT;
1772 case ST_IMPLICIT_NONE:
1773 if (p->state > ORDER_IMPLICIT_NONE)
1776 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1777 statement disqualifies a USE but not an IMPLICIT NONE.
1778 Duplicate IMPLICIT NONEs are caught when the implicit types
1781 p->state = ORDER_IMPLICIT_NONE;
1785 if (p->state > ORDER_IMPLICIT)
1787 p->state = ORDER_IMPLICIT;
1792 if (p->state < ORDER_IMPLICIT_NONE)
1793 p->state = ORDER_IMPLICIT_NONE;
1797 if (p->state >= ORDER_EXEC)
1799 if (p->state < ORDER_IMPLICIT)
1800 p->state = ORDER_IMPLICIT;
1804 if (p->state < ORDER_SPEC)
1805 p->state = ORDER_SPEC;
1810 case ST_DERIVED_DECL:
1812 if (p->state >= ORDER_EXEC)
1814 if (p->state < ORDER_SPEC)
1815 p->state = ORDER_SPEC;
1820 if (p->state < ORDER_EXEC)
1821 p->state = ORDER_EXEC;
1825 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1826 gfc_ascii_statement (st));
1829 /* All is well, record the statement in case we need it next time. */
1830 p->where = gfc_current_locus;
1831 p->last_statement = st;
1836 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1837 gfc_ascii_statement (st),
1838 gfc_ascii_statement (p->last_statement), &p->where);
1844 /* Handle an unexpected end of file. This is a show-stopper... */
1846 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1849 unexpected_eof (void)
1853 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1855 /* Memory cleanup. Move to "second to last". */
1856 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1859 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1862 longjmp (eof_buf, 1);
1866 /* Parse the CONTAINS section of a derived type definition. */
1868 gfc_access gfc_typebound_default_access;
1871 parse_derived_contains (void)
1874 bool seen_private = false;
1875 bool seen_comps = false;
1876 bool error_flag = false;
1879 gcc_assert (gfc_current_state () == COMP_DERIVED);
1880 gcc_assert (gfc_current_block ());
1882 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1884 if (gfc_current_block ()->attr.sequence)
1885 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1886 " section at %C", gfc_current_block ()->name);
1887 if (gfc_current_block ()->attr.is_bind_c)
1888 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1889 " section at %C", gfc_current_block ()->name);
1891 accept_statement (ST_CONTAINS);
1892 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1894 gfc_typebound_default_access = ACCESS_PUBLIC;
1900 st = next_statement ();
1908 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1912 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1913 " procedure at %C") == FAILURE)
1916 accept_statement (ST_PROCEDURE);
1921 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1922 " at %C") == FAILURE)
1925 accept_statement (ST_GENERIC);
1930 if (gfc_notify_std (GFC_STD_F2003,
1931 "Fortran 2003: FINAL procedure declaration"
1932 " at %C") == FAILURE)
1935 accept_statement (ST_FINAL);
1943 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1944 "definition at %C with empty CONTAINS "
1945 "section") == FAILURE))
1948 /* ST_END_TYPE is accepted by parse_derived after return. */
1952 if (gfc_find_state (COMP_MODULE) == FAILURE)
1954 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1961 gfc_error ("PRIVATE statement at %C must precede procedure"
1968 gfc_error ("Duplicate PRIVATE statement at %C");
1972 accept_statement (ST_PRIVATE);
1973 gfc_typebound_default_access = ACCESS_PRIVATE;
1974 seen_private = true;
1978 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1982 gfc_error ("Already inside a CONTAINS block at %C");
1986 unexpected_statement (st);
1994 reject_statement ();
1998 gcc_assert (gfc_current_state () == COMP_DERIVED);
2004 /* Parse a derived type. */
2007 parse_derived (void)
2009 int compiling_type, seen_private, seen_sequence, seen_component;
2015 accept_statement (ST_DERIVED_DECL);
2016 push_state (&s, COMP_DERIVED, gfc_new_block);
2018 gfc_new_block->component_access = ACCESS_PUBLIC;
2025 while (compiling_type)
2027 st = next_statement ();
2035 accept_statement (st);
2040 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
2047 if (!seen_component)
2048 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
2049 "definition at %C without components");
2051 accept_statement (ST_END_TYPE);
2055 if (gfc_find_state (COMP_MODULE) == FAILURE)
2057 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2064 gfc_error ("PRIVATE statement at %C must precede "
2065 "structure components");
2070 gfc_error ("Duplicate PRIVATE statement at %C");
2072 s.sym->component_access = ACCESS_PRIVATE;
2074 accept_statement (ST_PRIVATE);
2081 gfc_error ("SEQUENCE statement at %C must precede "
2082 "structure components");
2086 if (gfc_current_block ()->attr.sequence)
2087 gfc_warning ("SEQUENCE attribute at %C already specified in "
2092 gfc_error ("Duplicate SEQUENCE statement at %C");
2096 gfc_add_sequence (&gfc_current_block ()->attr,
2097 gfc_current_block ()->name, NULL);
2101 gfc_notify_std (GFC_STD_F2003,
2102 "Fortran 2003: CONTAINS block in derived type"
2103 " definition at %C");
2105 accept_statement (ST_CONTAINS);
2106 parse_derived_contains ();
2110 unexpected_statement (st);
2115 /* need to verify that all fields of the derived type are
2116 * interoperable with C if the type is declared to be bind(c)
2118 sym = gfc_current_block ();
2119 for (c = sym->components; c; c = c->next)
2121 /* Look for allocatable components. */
2122 if (c->attr.allocatable
2123 || (c->ts.type == BT_CLASS && c->attr.class_ok
2124 && CLASS_DATA (c)->attr.allocatable)
2125 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2126 sym->attr.alloc_comp = 1;
2128 /* Look for pointer components. */
2130 || (c->ts.type == BT_CLASS && c->attr.class_ok
2131 && CLASS_DATA (c)->attr.class_pointer)
2132 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2133 sym->attr.pointer_comp = 1;
2135 /* Look for procedure pointer components. */
2136 if (c->attr.proc_pointer
2137 || (c->ts.type == BT_DERIVED
2138 && c->ts.u.derived->attr.proc_pointer_comp))
2139 sym->attr.proc_pointer_comp = 1;
2141 /* Looking for coarray components. */
2142 if (c->attr.codimension
2143 || (c->attr.coarray_comp && !c->attr.pointer && !c->attr.allocatable))
2144 sym->attr.coarray_comp = 1;
2146 /* Looking for lock_type components. */
2147 if (c->attr.lock_comp
2148 || (sym->ts.type == BT_DERIVED
2149 && c->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2150 && c->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE))
2151 sym->attr.lock_comp = 1;
2153 /* Look for private components. */
2154 if (sym->component_access == ACCESS_PRIVATE
2155 || c->attr.access == ACCESS_PRIVATE
2156 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2157 sym->attr.private_comp = 1;
2160 if (!seen_component)
2161 sym->attr.zero_comp = 1;
2167 /* Parse an ENUM. */
2175 int seen_enumerator = 0;
2177 push_state (&s, COMP_ENUM, gfc_new_block);
2181 while (compiling_enum)
2183 st = next_statement ();
2191 seen_enumerator = 1;
2192 accept_statement (st);
2197 if (!seen_enumerator)
2198 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2199 accept_statement (st);
2203 gfc_free_enum_history ();
2204 unexpected_statement (st);
2212 /* Parse an interface. We must be able to deal with the possibility
2213 of recursive interfaces. The parse_spec() subroutine is mutually
2214 recursive with parse_interface(). */
2216 static gfc_statement parse_spec (gfc_statement);
2219 parse_interface (void)
2221 gfc_compile_state new_state = COMP_NONE, current_state;
2222 gfc_symbol *prog_unit, *sym;
2223 gfc_interface_info save;
2224 gfc_state_data s1, s2;
2228 accept_statement (ST_INTERFACE);
2230 current_interface.ns = gfc_current_ns;
2231 save = current_interface;
2233 sym = (current_interface.type == INTERFACE_GENERIC
2234 || current_interface.type == INTERFACE_USER_OP)
2235 ? gfc_new_block : NULL;
2237 push_state (&s1, COMP_INTERFACE, sym);
2238 current_state = COMP_NONE;
2241 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2243 st = next_statement ();
2251 if (st == ST_SUBROUTINE)
2252 new_state = COMP_SUBROUTINE;
2253 else if (st == ST_FUNCTION)
2254 new_state = COMP_FUNCTION;
2255 if (gfc_new_block->attr.pointer)
2257 gfc_new_block->attr.pointer = 0;
2258 gfc_new_block->attr.proc_pointer = 1;
2260 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2261 gfc_new_block->formal, NULL) == FAILURE)
2263 reject_statement ();
2264 gfc_free_namespace (gfc_current_ns);
2270 case ST_MODULE_PROC: /* The module procedure matcher makes
2271 sure the context is correct. */
2272 accept_statement (st);
2273 gfc_free_namespace (gfc_current_ns);
2276 case ST_END_INTERFACE:
2277 gfc_free_namespace (gfc_current_ns);
2278 gfc_current_ns = current_interface.ns;
2282 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2283 gfc_ascii_statement (st));
2284 reject_statement ();
2285 gfc_free_namespace (gfc_current_ns);
2290 /* Make sure that the generic name has the right attribute. */
2291 if (current_interface.type == INTERFACE_GENERIC
2292 && current_state == COMP_NONE)
2294 if (new_state == COMP_FUNCTION && sym)
2295 gfc_add_function (&sym->attr, sym->name, NULL);
2296 else if (new_state == COMP_SUBROUTINE && sym)
2297 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2299 current_state = new_state;
2302 if (current_interface.type == INTERFACE_ABSTRACT)
2304 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2305 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2306 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2307 "cannot be the same as an intrinsic type",
2308 gfc_new_block->name);
2311 push_state (&s2, new_state, gfc_new_block);
2312 accept_statement (st);
2313 prog_unit = gfc_new_block;
2314 prog_unit->formal_ns = gfc_current_ns;
2315 proc_locus = gfc_current_locus;
2318 /* Read data declaration statements. */
2319 st = parse_spec (ST_NONE);
2321 /* Since the interface block does not permit an IMPLICIT statement,
2322 the default type for the function or the result must be taken
2323 from the formal namespace. */
2324 if (new_state == COMP_FUNCTION)
2326 if (prog_unit->result == prog_unit
2327 && prog_unit->ts.type == BT_UNKNOWN)
2328 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2329 else if (prog_unit->result != prog_unit
2330 && prog_unit->result->ts.type == BT_UNKNOWN)
2331 gfc_set_default_type (prog_unit->result, 1,
2332 prog_unit->formal_ns);
2335 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2337 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2338 gfc_ascii_statement (st));
2339 reject_statement ();
2343 /* Add EXTERNAL attribute to function or subroutine. */
2344 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2345 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2347 current_interface = save;
2348 gfc_add_interface (prog_unit);
2351 if (current_interface.ns
2352 && current_interface.ns->proc_name
2353 && strcmp (current_interface.ns->proc_name->name,
2354 prog_unit->name) == 0)
2355 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2356 "enclosing procedure", prog_unit->name, &proc_locus);
2365 /* Associate function characteristics by going back to the function
2366 declaration and rematching the prefix. */
2369 match_deferred_characteristics (gfc_typespec * ts)
2372 match m = MATCH_ERROR;
2373 char name[GFC_MAX_SYMBOL_LEN + 1];
2375 loc = gfc_current_locus;
2377 gfc_current_locus = gfc_current_block ()->declared_at;
2380 gfc_buffer_error (1);
2381 m = gfc_match_prefix (ts);
2382 gfc_buffer_error (0);
2384 if (ts->type == BT_DERIVED)
2392 /* Only permit one go at the characteristic association. */
2396 /* Set the function locus correctly. If we have not found the
2397 function name, there is an error. */
2399 && gfc_match ("function% %n", name) == MATCH_YES
2400 && strcmp (name, gfc_current_block ()->name) == 0)
2402 gfc_current_block ()->declared_at = gfc_current_locus;
2403 gfc_commit_symbols ();
2408 gfc_undo_symbols ();
2411 gfc_current_locus =loc;
2416 /* Check specification-expressions in the function result of the currently
2417 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2418 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2419 scope are not yet parsed so this has to be delayed up to parse_spec. */
2422 check_function_result_typed (void)
2424 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2426 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2427 gcc_assert (ts->type != BT_UNKNOWN);
2429 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2430 /* TODO: Extend when KIND type parameters are implemented. */
2431 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2432 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2436 /* Parse a set of specification statements. Returns the statement
2437 that doesn't fit. */
2439 static gfc_statement
2440 parse_spec (gfc_statement st)
2443 bool function_result_typed = false;
2444 bool bad_characteristic = false;
2447 verify_st_order (&ss, ST_NONE, false);
2449 st = next_statement ();
2451 /* If we are not inside a function or don't have a result specified so far,
2452 do nothing special about it. */
2453 if (gfc_current_state () != COMP_FUNCTION)
2454 function_result_typed = true;
2457 gfc_symbol* proc = gfc_current_ns->proc_name;
2460 if (proc->result->ts.type == BT_UNKNOWN)
2461 function_result_typed = true;
2466 /* If we're inside a BLOCK construct, some statements are disallowed.
2467 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2468 or VALUE are also disallowed, but they don't have a particular ST_*
2469 key so we have to check for them individually in their matcher routine. */
2470 if (gfc_current_state () == COMP_BLOCK)
2474 case ST_IMPLICIT_NONE:
2477 case ST_EQUIVALENCE:
2478 case ST_STATEMENT_FUNCTION:
2479 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2480 gfc_ascii_statement (st));
2481 reject_statement ();
2488 /* If we find a statement that can not be followed by an IMPLICIT statement
2489 (and thus we can expect to see none any further), type the function result
2490 if it has not yet been typed. Be careful not to give the END statement
2491 to verify_st_order! */
2492 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2494 bool verify_now = false;
2496 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2501 verify_st_order (&dummyss, ST_NONE, false);
2502 verify_st_order (&dummyss, st, false);
2504 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2510 check_function_result_typed ();
2511 function_result_typed = true;
2520 case ST_IMPLICIT_NONE:
2522 if (!function_result_typed)
2524 check_function_result_typed ();
2525 function_result_typed = true;
2531 case ST_DATA: /* Not allowed in interfaces */
2532 if (gfc_current_state () == COMP_INTERFACE)
2542 case ST_DERIVED_DECL:
2545 if (verify_st_order (&ss, st, false) == FAILURE)
2547 reject_statement ();
2548 st = next_statement ();
2558 case ST_DERIVED_DECL:
2564 if (gfc_current_state () != COMP_MODULE)
2566 gfc_error ("%s statement must appear in a MODULE",
2567 gfc_ascii_statement (st));
2568 reject_statement ();
2572 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2574 gfc_error ("%s statement at %C follows another accessibility "
2575 "specification", gfc_ascii_statement (st));
2576 reject_statement ();
2580 gfc_current_ns->default_access = (st == ST_PUBLIC)
2581 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2585 case ST_STATEMENT_FUNCTION:
2586 if (gfc_current_state () == COMP_MODULE)
2588 unexpected_statement (st);
2596 accept_statement (st);
2597 st = next_statement ();
2601 accept_statement (st);
2603 st = next_statement ();
2606 case ST_GET_FCN_CHARACTERISTICS:
2607 /* This statement triggers the association of a function's result
2609 ts = &gfc_current_block ()->result->ts;
2610 if (match_deferred_characteristics (ts) != MATCH_YES)
2611 bad_characteristic = true;
2613 st = next_statement ();
2620 /* If match_deferred_characteristics failed, then there is an error. */
2621 if (bad_characteristic)
2623 ts = &gfc_current_block ()->result->ts;
2624 if (ts->type != BT_DERIVED)
2625 gfc_error ("Bad kind expression for function '%s' at %L",
2626 gfc_current_block ()->name,
2627 &gfc_current_block ()->declared_at);
2629 gfc_error ("The type for function '%s' at %L is not accessible",
2630 gfc_current_block ()->name,
2631 &gfc_current_block ()->declared_at);
2633 gfc_current_block ()->ts.kind = 0;
2634 /* Keep the derived type; if it's bad, it will be discovered later. */
2635 if (!(ts->type == BT_DERIVED && ts->u.derived))
2636 ts->type = BT_UNKNOWN;
2643 /* Parse a WHERE block, (not a simple WHERE statement). */
2646 parse_where_block (void)
2648 int seen_empty_else;
2653 accept_statement (ST_WHERE_BLOCK);
2654 top = gfc_state_stack->tail;
2656 push_state (&s, COMP_WHERE, gfc_new_block);
2658 d = add_statement ();
2659 d->expr1 = top->expr1;
2665 seen_empty_else = 0;
2669 st = next_statement ();
2675 case ST_WHERE_BLOCK:
2676 parse_where_block ();
2681 accept_statement (st);
2685 if (seen_empty_else)
2687 gfc_error ("ELSEWHERE statement at %C follows previous "
2688 "unmasked ELSEWHERE");
2692 if (new_st.expr1 == NULL)
2693 seen_empty_else = 1;
2695 d = new_level (gfc_state_stack->head);
2697 d->expr1 = new_st.expr1;
2699 accept_statement (st);
2704 accept_statement (st);
2708 gfc_error ("Unexpected %s statement in WHERE block at %C",
2709 gfc_ascii_statement (st));
2710 reject_statement ();
2714 while (st != ST_END_WHERE);
2720 /* Parse a FORALL block (not a simple FORALL statement). */
2723 parse_forall_block (void)
2729 accept_statement (ST_FORALL_BLOCK);
2730 top = gfc_state_stack->tail;
2732 push_state (&s, COMP_FORALL, gfc_new_block);
2734 d = add_statement ();
2735 d->op = EXEC_FORALL;
2740 st = next_statement ();
2745 case ST_POINTER_ASSIGNMENT:
2748 accept_statement (st);
2751 case ST_WHERE_BLOCK:
2752 parse_where_block ();
2755 case ST_FORALL_BLOCK:
2756 parse_forall_block ();
2760 accept_statement (st);
2767 gfc_error ("Unexpected %s statement in FORALL block at %C",
2768 gfc_ascii_statement (st));
2770 reject_statement ();
2774 while (st != ST_END_FORALL);
2780 static gfc_statement parse_executable (gfc_statement);
2782 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2785 parse_if_block (void)
2794 accept_statement (ST_IF_BLOCK);
2796 top = gfc_state_stack->tail;
2797 push_state (&s, COMP_IF, gfc_new_block);
2799 new_st.op = EXEC_IF;
2800 d = add_statement ();
2802 d->expr1 = top->expr1;
2808 st = parse_executable (ST_NONE);
2818 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2819 "statement at %L", &else_locus);
2821 reject_statement ();
2825 d = new_level (gfc_state_stack->head);
2827 d->expr1 = new_st.expr1;
2829 accept_statement (st);
2836 gfc_error ("Duplicate ELSE statements at %L and %C",
2838 reject_statement ();
2843 else_locus = gfc_current_locus;
2845 d = new_level (gfc_state_stack->head);
2848 accept_statement (st);
2856 unexpected_statement (st);
2860 while (st != ST_ENDIF);
2863 accept_statement (st);
2867 /* Parse a SELECT block. */
2870 parse_select_block (void)
2876 accept_statement (ST_SELECT_CASE);
2878 cp = gfc_state_stack->tail;
2879 push_state (&s, COMP_SELECT, gfc_new_block);
2881 /* Make sure that the next statement is a CASE or END SELECT. */
2884 st = next_statement ();
2887 if (st == ST_END_SELECT)
2889 /* Empty SELECT CASE is OK. */
2890 accept_statement (st);
2897 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2900 reject_statement ();
2903 /* At this point, we're got a nonempty select block. */
2904 cp = new_level (cp);
2907 accept_statement (st);
2911 st = parse_executable (ST_NONE);
2918 cp = new_level (gfc_state_stack->head);
2920 gfc_clear_new_st ();
2922 accept_statement (st);
2928 /* Can't have an executable statement because of
2929 parse_executable(). */
2931 unexpected_statement (st);
2935 while (st != ST_END_SELECT);
2938 accept_statement (st);
2942 /* Pop the current selector from the SELECT TYPE stack. */
2945 select_type_pop (void)
2947 gfc_select_type_stack *old = select_type_stack;
2948 select_type_stack = old->prev;
2953 /* Parse a SELECT TYPE construct (F03:R821). */
2956 parse_select_type_block (void)
2962 accept_statement (ST_SELECT_TYPE);
2964 cp = gfc_state_stack->tail;
2965 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
2967 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
2971 st = next_statement ();
2974 if (st == ST_END_SELECT)
2975 /* Empty SELECT CASE is OK. */
2977 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
2980 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
2981 "following SELECT TYPE at %C");
2983 reject_statement ();
2986 /* At this point, we're got a nonempty select block. */
2987 cp = new_level (cp);
2990 accept_statement (st);
2994 st = parse_executable (ST_NONE);
3002 cp = new_level (gfc_state_stack->head);
3004 gfc_clear_new_st ();
3006 accept_statement (st);
3012 /* Can't have an executable statement because of
3013 parse_executable(). */
3015 unexpected_statement (st);
3019 while (st != ST_END_SELECT);
3023 accept_statement (st);
3024 gfc_current_ns = gfc_current_ns->parent;
3029 /* Given a symbol, make sure it is not an iteration variable for a DO
3030 statement. This subroutine is called when the symbol is seen in a
3031 context that causes it to become redefined. If the symbol is an
3032 iterator, we generate an error message and return nonzero. */
3035 gfc_check_do_variable (gfc_symtree *st)
3039 for (s=gfc_state_stack; s; s = s->previous)
3040 if (s->do_variable == st)
3042 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3043 "loop beginning at %L", st->name, &s->head->loc);
3051 /* Checks to see if the current statement label closes an enddo.
3052 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3053 an error) if it incorrectly closes an ENDDO. */
3056 check_do_closure (void)
3060 if (gfc_statement_label == NULL)
3063 for (p = gfc_state_stack; p; p = p->previous)
3064 if (p->state == COMP_DO)
3068 return 0; /* No loops to close */
3070 if (p->ext.end_do_label == gfc_statement_label)
3072 if (p == gfc_state_stack)
3075 gfc_error ("End of nonblock DO statement at %C is within another block");
3079 /* At this point, the label doesn't terminate the innermost loop.
3080 Make sure it doesn't terminate another one. */
3081 for (; p; p = p->previous)
3082 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
3084 gfc_error ("End of nonblock DO statement at %C is interwoven "
3085 "with another DO loop");
3093 /* Parse a series of contained program units. */
3095 static void parse_progunit (gfc_statement);
3098 /* Parse a CRITICAL block. */
3101 parse_critical_block (void)
3107 s.ext.end_do_label = new_st.label1;
3109 accept_statement (ST_CRITICAL);
3110 top = gfc_state_stack->tail;
3112 push_state (&s, COMP_CRITICAL, gfc_new_block);
3114 d = add_statement ();
3115 d->op = EXEC_CRITICAL;
3120 st = parse_executable (ST_NONE);
3128 case ST_END_CRITICAL:
3129 if (s.ext.end_do_label != NULL
3130 && s.ext.end_do_label != gfc_statement_label)
3131 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3132 "match CRITIAL label");
3134 if (gfc_statement_label != NULL)
3136 new_st.op = EXEC_NOP;
3142 unexpected_statement (st);
3146 while (st != ST_END_CRITICAL);
3149 accept_statement (st);
3153 /* Set up the local namespace for a BLOCK construct. */
3156 gfc_build_block_ns (gfc_namespace *parent_ns)
3158 gfc_namespace* my_ns;
3159 static int numblock = 1;
3161 my_ns = gfc_get_namespace (parent_ns, 1);
3162 my_ns->construct_entities = 1;
3164 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3165 code generation (so it must not be NULL).
3166 We set its recursive argument if our container procedure is recursive, so
3167 that local variables are accordingly placed on the stack when it
3168 will be necessary. */
3170 my_ns->proc_name = gfc_new_block;
3174 char buffer[20]; /* Enough to hold "block@2147483648\n". */
3176 snprintf(buffer, sizeof(buffer), "block@%d", numblock++);
3177 gfc_get_symbol (buffer, my_ns, &my_ns->proc_name);
3178 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3179 my_ns->proc_name->name, NULL);
3180 gcc_assert (t == SUCCESS);
3181 gfc_commit_symbol (my_ns->proc_name);
3184 if (parent_ns->proc_name)
3185 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3191 /* Parse a BLOCK construct. */
3194 parse_block_construct (void)
3196 gfc_namespace* my_ns;
3199 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BLOCK construct at %C");
3201 my_ns = gfc_build_block_ns (gfc_current_ns);
3203 new_st.op = EXEC_BLOCK;
3204 new_st.ext.block.ns = my_ns;
3205 new_st.ext.block.assoc = NULL;
3206 accept_statement (ST_BLOCK);
3208 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3209 gfc_current_ns = my_ns;
3211 parse_progunit (ST_NONE);
3213 gfc_current_ns = gfc_current_ns->parent;
3218 /* Parse an ASSOCIATE construct. This is essentially a BLOCK construct
3219 behind the scenes with compiler-generated variables. */
3222 parse_associate (void)
3224 gfc_namespace* my_ns;
3227 gfc_association_list* a;
3229 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASSOCIATE construct at %C");
3231 my_ns = gfc_build_block_ns (gfc_current_ns);
3233 new_st.op = EXEC_BLOCK;
3234 new_st.ext.block.ns = my_ns;
3235 gcc_assert (new_st.ext.block.assoc);
3237 /* Add all associate-names as BLOCK variables. Creating them is enough
3238 for now, they'll get their values during trans-* phase. */
3239 gfc_current_ns = my_ns;
3240 for (a = new_st.ext.block.assoc; a; a = a->next)
3244 if (gfc_get_sym_tree (a->name, NULL, &a->st, false))
3248 sym->attr.flavor = FL_VARIABLE;
3250 sym->declared_at = a->where;
3251 gfc_set_sym_referenced (sym);
3253 /* Initialize the typespec. It is not available in all cases,
3254 however, as it may only be set on the target during resolution.
3255 Still, sometimes it helps to have it right now -- especially
3256 for parsing component references on the associate-name
3257 in case of assication to a derived-type. */
3258 sym->ts = a->target->ts;
3261 accept_statement (ST_ASSOCIATE);
3262 push_state (&s, COMP_ASSOCIATE, my_ns->proc_name);
3265 st = parse_executable (ST_NONE);
3272 accept_statement (st);
3273 my_ns->code = gfc_state_stack->head;
3277 unexpected_statement (st);
3281 gfc_current_ns = gfc_current_ns->parent;
3286 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3287 handled inside of parse_executable(), because they aren't really
3291 parse_do_block (void)
3298 s.ext.end_do_label = new_st.label1;
3300 if (new_st.ext.iterator != NULL)
3301 stree = new_st.ext.iterator->var->symtree;
3305 accept_statement (ST_DO);
3307 top = gfc_state_stack->tail;
3308 push_state (&s, COMP_DO, gfc_new_block);
3310 s.do_variable = stree;
3312 top->block = new_level (top);
3313 top->block->op = EXEC_DO;
3316 st = parse_executable (ST_NONE);
3324 if (s.ext.end_do_label != NULL
3325 && s.ext.end_do_label != gfc_statement_label)
3326 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3329 if (gfc_statement_label != NULL)
3331 new_st.op = EXEC_NOP;
3336 case ST_IMPLIED_ENDDO:
3337 /* If the do-stmt of this DO construct has a do-construct-name,
3338 the corresponding end-do must be an end-do-stmt (with a matching
3339 name, but in that case we must have seen ST_ENDDO first).
3340 We only complain about this in pedantic mode. */
3341 if (gfc_current_block () != NULL)
3342 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3343 &gfc_current_block()->declared_at);
3348 unexpected_statement (st);
3353 accept_statement (st);
3357 /* Parse the statements of OpenMP do/parallel do. */
3359 static gfc_statement
3360 parse_omp_do (gfc_statement omp_st)
3366 accept_statement (omp_st);
3368 cp = gfc_state_stack->tail;
3369 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3370 np = new_level (cp);
3376 st = next_statement ();
3379 else if (st == ST_DO)
3382 unexpected_statement (st);
3386 if (gfc_statement_label != NULL
3387 && gfc_state_stack->previous != NULL
3388 && gfc_state_stack->previous->state == COMP_DO
3389 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3397 there should be no !$OMP END DO. */
3399 return ST_IMPLIED_ENDDO;
3402 check_do_closure ();
3405 st = next_statement ();
3406 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3408 if (new_st.op == EXEC_OMP_END_NOWAIT)
3409 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3411 gcc_assert (new_st.op == EXEC_NOP);
3412 gfc_clear_new_st ();
3413 gfc_commit_symbols ();
3414 gfc_warning_check ();
3415 st = next_statement ();
3421 /* Parse the statements of OpenMP atomic directive. */
3424 parse_omp_atomic (void)
3430 accept_statement (ST_OMP_ATOMIC);
3432 cp = gfc_state_stack->tail;
3433 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3434 np = new_level (cp);
3440 st = next_statement ();
3443 else if (st == ST_ASSIGNMENT)
3446 unexpected_statement (st);
3449 accept_statement (st);
3455 /* Parse the statements of an OpenMP structured block. */
3458 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3460 gfc_statement st, omp_end_st;
3464 accept_statement (omp_st);
3466 cp = gfc_state_stack->tail;
3467 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3468 np = new_level (cp);
3474 case ST_OMP_PARALLEL:
3475 omp_end_st = ST_OMP_END_PARALLEL;
3477 case ST_OMP_PARALLEL_SECTIONS:
3478 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3480 case ST_OMP_SECTIONS:
3481 omp_end_st = ST_OMP_END_SECTIONS;
3483 case ST_OMP_ORDERED:
3484 omp_end_st = ST_OMP_END_ORDERED;
3486 case ST_OMP_CRITICAL:
3487 omp_end_st = ST_OMP_END_CRITICAL;
3490 omp_end_st = ST_OMP_END_MASTER;
3493 omp_end_st = ST_OMP_END_SINGLE;
3496 omp_end_st = ST_OMP_END_TASK;
3498 case ST_OMP_WORKSHARE:
3499 omp_end_st = ST_OMP_END_WORKSHARE;
3501 case ST_OMP_PARALLEL_WORKSHARE:
3502 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3510 if (workshare_stmts_only)
3512 /* Inside of !$omp workshare, only
3515 where statements and constructs
3516 forall statements and constructs
3520 are allowed. For !$omp critical these
3521 restrictions apply recursively. */
3524 st = next_statement ();
3535 accept_statement (st);
3538 case ST_WHERE_BLOCK:
3539 parse_where_block ();
3542 case ST_FORALL_BLOCK:
3543 parse_forall_block ();
3546 case ST_OMP_PARALLEL:
3547 case ST_OMP_PARALLEL_SECTIONS:
3548 parse_omp_structured_block (st, false);
3551 case ST_OMP_PARALLEL_WORKSHARE:
3552 case ST_OMP_CRITICAL:
3553 parse_omp_structured_block (st, true);
3556 case ST_OMP_PARALLEL_DO:
3557 st = parse_omp_do (st);
3561 parse_omp_atomic ();
3572 st = next_statement ();
3576 st = parse_executable (ST_NONE);
3579 else if (st == ST_OMP_SECTION
3580 && (omp_st == ST_OMP_SECTIONS
3581 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3583 np = new_level (np);
3587 else if (st != omp_end_st)
3588 unexpected_statement (st);
3590 while (st != omp_end_st);
3594 case EXEC_OMP_END_NOWAIT:
3595 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3597 case EXEC_OMP_CRITICAL:
3598 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3599 || (new_st.ext.omp_name != NULL
3600 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3601 gfc_error ("Name after !$omp critical and !$omp end critical does "
3603 free (CONST_CAST (char *, new_st.ext.omp_name));
3605 case EXEC_OMP_END_SINGLE:
3606 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3607 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3608 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3609 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3617 gfc_clear_new_st ();
3618 gfc_commit_symbols ();
3619 gfc_warning_check ();
3624 /* Accept a series of executable statements. We return the first
3625 statement that doesn't fit to the caller. Any block statements are
3626 passed on to the correct handler, which usually passes the buck
3629 static gfc_statement
3630 parse_executable (gfc_statement st)
3635 st = next_statement ();
3639 close_flag = check_do_closure ();
3644 case ST_END_PROGRAM:
3647 case ST_END_FUNCTION:
3652 case ST_END_SUBROUTINE:
3657 case ST_SELECT_CASE:
3658 gfc_error ("%s statement at %C cannot terminate a non-block "
3659 "DO loop", gfc_ascii_statement (st));
3675 accept_statement (st);
3676 if (close_flag == 1)
3677 return ST_IMPLIED_ENDDO;
3681 parse_block_construct ();
3692 case ST_SELECT_CASE:
3693 parse_select_block ();
3696 case ST_SELECT_TYPE:
3697 parse_select_type_block();
3702 if (check_do_closure () == 1)
3703 return ST_IMPLIED_ENDDO;
3707 parse_critical_block ();
3710 case ST_WHERE_BLOCK:
3711 parse_where_block ();
3714 case ST_FORALL_BLOCK:
3715 parse_forall_block ();
3718 case ST_OMP_PARALLEL:
3719 case ST_OMP_PARALLEL_SECTIONS:
3720 case ST_OMP_SECTIONS:
3721 case ST_OMP_ORDERED:
3722 case ST_OMP_CRITICAL:
3726 parse_omp_structured_block (st, false);
3729 case ST_OMP_WORKSHARE:
3730 case ST_OMP_PARALLEL_WORKSHARE:
3731 parse_omp_structured_block (st, true);
3735 case ST_OMP_PARALLEL_DO:
3736 st = parse_omp_do (st);
3737 if (st == ST_IMPLIED_ENDDO)
3742 parse_omp_atomic ();
3749 st = next_statement ();
3754 /* Fix the symbols for sibling functions. These are incorrectly added to
3755 the child namespace as the parser didn't know about this procedure. */
3758 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3762 gfc_symbol *old_sym;
3764 sym->attr.referenced = 1;
3765 for (ns = siblings; ns; ns = ns->sibling)
3767 st = gfc_find_symtree (ns->sym_root, sym->name);
3769 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3770 goto fixup_contained;
3772 old_sym = st->n.sym;
3773 if (old_sym->ns == ns
3774 && !old_sym->attr.contained
3776 /* By 14.6.1.3, host association should be excluded
3777 for the following. */
3778 && !(old_sym->attr.external
3779 || (old_sym->ts.type != BT_UNKNOWN
3780 && !old_sym->attr.implicit_type)
3781 || old_sym->attr.flavor == FL_PARAMETER
3782 || old_sym->attr.use_assoc
3783 || old_sym->attr.in_common
3784 || old_sym->attr.in_equivalence
3785 || old_sym->attr.data
3786 || old_sym->attr.dummy
3787 || old_sym->attr.result
3788 || old_sym->attr.dimension
3789 || old_sym->attr.allocatable
3790 || old_sym->attr.intrinsic
3791 || old_sym->attr.generic
3792 || old_sym->attr.flavor == FL_NAMELIST
3793 || old_sym->attr.proc == PROC_ST_FUNCTION))
3795 /* Replace it with the symbol from the parent namespace. */
3799 gfc_release_symbol (old_sym);
3803 /* Do the same for any contained procedures. */
3804 gfc_fixup_sibling_symbols (sym, ns->contained);
3809 parse_contained (int module)
3811 gfc_namespace *ns, *parent_ns, *tmp;
3812 gfc_state_data s1, s2;
3816 int contains_statements = 0;
3819 push_state (&s1, COMP_CONTAINS, NULL);
3820 parent_ns = gfc_current_ns;
3824 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3826 gfc_current_ns->sibling = parent_ns->contained;
3827 parent_ns->contained = gfc_current_ns;
3830 /* Process the next available statement. We come here if we got an error
3831 and rejected the last statement. */
3832 st = next_statement ();
3841 contains_statements = 1;
3842 accept_statement (st);
3845 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3848 /* For internal procedures, create/update the symbol in the
3849 parent namespace. */
3853 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3854 gfc_error ("Contained procedure '%s' at %C is already "
3855 "ambiguous", gfc_new_block->name);
3858 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3859 &gfc_new_block->declared_at) ==
3862 if (st == ST_FUNCTION)
3863 gfc_add_function (&sym->attr, sym->name,
3864 &gfc_new_block->declared_at);
3866 gfc_add_subroutine (&sym->attr, sym->name,
3867 &gfc_new_block->declared_at);
3871 gfc_commit_symbols ();
3874 sym = gfc_new_block;
3876 /* Mark this as a contained function, so it isn't replaced
3877 by other module functions. */
3878 sym->attr.contained = 1;
3879 sym->attr.referenced = 1;
3881 /* Set implicit_pure so that it can be reset if any of the
3882 tests for purity fail. This is used for some optimisation
3883 during translation. */
3884 if (!sym->attr.pure)
3885 sym->attr.implicit_pure = 1;
3887 parse_progunit (ST_NONE);
3889 /* Fix up any sibling functions that refer to this one. */
3890 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3891 /* Or refer to any of its alternate entry points. */
3892 for (el = gfc_current_ns->entries; el; el = el->next)
3893 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3895 gfc_current_ns->code = s2.head;
3896 gfc_current_ns = parent_ns;
3901 /* These statements are associated with the end of the host unit. */
3902 case ST_END_FUNCTION:
3904 case ST_END_PROGRAM:
3905 case ST_END_SUBROUTINE:
3906 accept_statement (st);
3910 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3911 gfc_ascii_statement (st));
3912 reject_statement ();
3918 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3919 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3921 /* The first namespace in the list is guaranteed to not have
3922 anything (worthwhile) in it. */
3923 tmp = gfc_current_ns;
3924 gfc_current_ns = parent_ns;
3925 if (seen_error && tmp->refs > 1)
3926 gfc_free_namespace (tmp);
3928 ns = gfc_current_ns->contained;
3929 gfc_current_ns->contained = ns->sibling;
3930 gfc_free_namespace (ns);
3933 if (!contains_statements)
3934 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3935 "FUNCTION or SUBROUTINE statement at %C");
3939 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
3942 parse_progunit (gfc_statement st)
3947 st = parse_spec (st);
3954 /* This is not allowed within BLOCK! */
3955 if (gfc_current_state () != COMP_BLOCK)
3960 accept_statement (st);
3967 if (gfc_current_state () == COMP_FUNCTION)
3968 gfc_check_function_type (gfc_current_ns);
3973 st = parse_executable (st);
3981 /* This is not allowed within BLOCK! */
3982 if (gfc_current_state () != COMP_BLOCK)
3987 accept_statement (st);
3994 unexpected_statement (st);
3995 reject_statement ();
3996 st = next_statement ();
4002 for (p = gfc_state_stack; p; p = p->previous)
4003 if (p->state == COMP_CONTAINS)
4006 if (gfc_find_state (COMP_MODULE) == SUCCESS)
4011 gfc_error ("CONTAINS statement at %C is already in a contained "
4013 reject_statement ();
4014 st = next_statement ();
4018 parse_contained (0);
4021 gfc_current_ns->code = gfc_state_stack->head;
4025 /* Come here to complain about a global symbol already in use as
4029 gfc_global_used (gfc_gsymbol *sym, locus *where)
4034 where = &gfc_current_locus;
4044 case GSYM_SUBROUTINE:
4045 name = "SUBROUTINE";
4050 case GSYM_BLOCK_DATA:
4051 name = "BLOCK DATA";
4057 gfc_internal_error ("gfc_global_used(): Bad type");
4061 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
4062 sym->name, where, name, &sym->where);
4066 /* Parse a block data program unit. */
4069 parse_block_data (void)
4072 static locus blank_locus;
4073 static int blank_block=0;
4076 gfc_current_ns->proc_name = gfc_new_block;
4077 gfc_current_ns->is_block_data = 1;
4079 if (gfc_new_block == NULL)
4082 gfc_error ("Blank BLOCK DATA at %C conflicts with "
4083 "prior BLOCK DATA at %L", &blank_locus);
4087 blank_locus = gfc_current_locus;
4092 s = gfc_get_gsymbol (gfc_new_block->name);
4094 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
4095 gfc_global_used(s, NULL);
4098 s->type = GSYM_BLOCK_DATA;
4099 s->where = gfc_current_locus;
4104 st = parse_spec (ST_NONE);
4106 while (st != ST_END_BLOCK_DATA)
4108 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
4109 gfc_ascii_statement (st));
4110 reject_statement ();
4111 st = next_statement ();
4116 /* Parse a module subprogram. */
4124 s = gfc_get_gsymbol (gfc_new_block->name);
4125 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4126 gfc_global_used(s, NULL);
4129 s->type = GSYM_MODULE;
4130 s->where = gfc_current_locus;
4134 st = parse_spec (ST_NONE);
4143 parse_contained (1);
4147 accept_statement (st);
4151 gfc_error ("Unexpected %s statement in MODULE at %C",
4152 gfc_ascii_statement (st));
4154 reject_statement ();
4155 st = next_statement ();
4159 s->ns = gfc_current_ns;
4163 /* Add a procedure name to the global symbol table. */
4166 add_global_procedure (int sub)
4170 s = gfc_get_gsymbol(gfc_new_block->name);
4173 || (s->type != GSYM_UNKNOWN
4174 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4175 gfc_global_used(s, NULL);
4178 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4179 s->where = gfc_current_locus;
4181 s->ns = gfc_current_ns;
4186 /* Add a program to the global symbol table. */
4189 add_global_program (void)
4193 if (gfc_new_block == NULL)
4195 s = gfc_get_gsymbol (gfc_new_block->name);
4197 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4198 gfc_global_used(s, NULL);
4201 s->type = GSYM_PROGRAM;
4202 s->where = gfc_current_locus;
4204 s->ns = gfc_current_ns;
4209 /* Resolve all the program units when whole file scope option
4212 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4214 gfc_free_dt_list ();
4215 gfc_current_ns = gfc_global_ns_list;
4216 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4218 if (gfc_current_ns->proc_name
4219 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4220 continue; /* Already resolved. */
4222 if (gfc_current_ns->proc_name)
4223 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4224 gfc_resolve (gfc_current_ns);
4225 gfc_current_ns->derived_types = gfc_derived_types;
4226 gfc_derived_types = NULL;
4232 clean_up_modules (gfc_gsymbol *gsym)
4237 clean_up_modules (gsym->left);
4238 clean_up_modules (gsym->right);
4240 if (gsym->type != GSYM_MODULE || !gsym->ns)
4243 gfc_current_ns = gsym->ns;
4244 gfc_derived_types = gfc_current_ns->derived_types;
4251 /* Translate all the program units when whole file scope option
4252 is active. This could be in a different order to resolution if
4253 there are forward references in the file. */
4255 translate_all_program_units (gfc_namespace *gfc_global_ns_list,
4260 gfc_current_ns = gfc_global_ns_list;
4261 gfc_get_errors (NULL, &errors);
4263 /* If the main program is in the translation unit and we have
4264 -fcoarray=libs, generate the static variables. */
4265 if (gfc_option.coarray == GFC_FCOARRAY_LIB && main_in_tu)
4266 gfc_init_coarray_decl (true);
4268 /* We first translate all modules to make sure that later parts
4269 of the program can use the decl. Then we translate the nonmodules. */
4271 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4273 if (!gfc_current_ns->proc_name
4274 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4277 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4278 gfc_derived_types = gfc_current_ns->derived_types;
4279 gfc_generate_module_code (gfc_current_ns);
4280 gfc_current_ns->translated = 1;
4283 gfc_current_ns = gfc_global_ns_list;
4284 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4286 if (gfc_current_ns->proc_name
4287 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4290 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4291 gfc_derived_types = gfc_current_ns->derived_types;
4292 gfc_generate_code (gfc_current_ns);
4293 gfc_current_ns->translated = 1;
4296 /* Clean up all the namespaces after translation. */
4297 gfc_current_ns = gfc_global_ns_list;
4298 for (;gfc_current_ns;)
4302 if (gfc_current_ns->proc_name
4303 && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
4305 gfc_current_ns = gfc_current_ns->sibling;
4309 ns = gfc_current_ns->sibling;
4310 gfc_derived_types = gfc_current_ns->derived_types;
4312 gfc_current_ns = ns;
4315 clean_up_modules (gfc_gsym_root);
4319 /* Top level parser. */
4322 gfc_parse_file (void)
4324 int seen_program, errors_before, errors;
4325 gfc_state_data top, s;
4328 gfc_namespace *next;
4330 gfc_start_source_files ();
4332 top.state = COMP_NONE;
4334 top.previous = NULL;
4335 top.head = top.tail = NULL;
4336 top.do_variable = NULL;
4338 gfc_state_stack = ⊤
4340 gfc_clear_new_st ();
4342 gfc_statement_label = NULL;
4344 if (setjmp (eof_buf))
4345 return FAILURE; /* Come here on unexpected EOF */
4347 /* Prepare the global namespace that will contain the
4349 gfc_global_ns_list = next = NULL;
4353 /* Exit early for empty files. */
4359 st = next_statement ();
4368 goto duplicate_main;
4370 prog_locus = gfc_current_locus;
4372 push_state (&s, COMP_PROGRAM, gfc_new_block);
4373 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4374 accept_statement (st);
4375 add_global_program ();
4376 parse_progunit (ST_NONE);
4377 if (gfc_option.flag_whole_file)
4382 add_global_procedure (1);
4383 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4384 accept_statement (st);
4385 parse_progunit (ST_NONE);
4386 if (gfc_option.flag_whole_file)
4391 add_global_procedure (0);
4392 push_state (&s, COMP_FUNCTION, gfc_new_block);
4393 accept_statement (st);
4394 parse_progunit (ST_NONE);
4395 if (gfc_option.flag_whole_file)
4400 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4401 accept_statement (st);
4402 parse_block_data ();
4406 push_state (&s, COMP_MODULE, gfc_new_block);
4407 accept_statement (st);
4409 gfc_get_errors (NULL, &errors_before);
4413 /* Anything else starts a nameless main program block. */
4416 goto duplicate_main;
4418 prog_locus = gfc_current_locus;
4420 push_state (&s, COMP_PROGRAM, gfc_new_block);
4421 main_program_symbol (gfc_current_ns, "MAIN__");
4422 parse_progunit (st);
4423 if (gfc_option.flag_whole_file)
4428 /* Handle the non-program units. */
4429 gfc_current_ns->code = s.head;
4431 gfc_resolve (gfc_current_ns);
4433 /* Dump the parse tree if requested. */
4434 if (gfc_option.dump_fortran_original)
4435 gfc_dump_parse_tree (gfc_current_ns, stdout);
4437 gfc_get_errors (NULL, &errors);
4438 if (s.state == COMP_MODULE)
4440 gfc_dump_module (s.sym->name, errors_before == errors);
4441 if (!gfc_option.flag_whole_file)
4444 gfc_generate_module_code (gfc_current_ns);
4450 gfc_current_ns->derived_types = gfc_derived_types;
4451 gfc_derived_types = NULL;
4458 gfc_generate_code (gfc_current_ns);
4466 /* The main program and non-contained procedures are put
4467 in the global namespace list, so that they can be processed
4468 later and all their interfaces resolved. */
4469 gfc_current_ns->code = s.head;
4472 for (; next->sibling; next = next->sibling)
4474 next->sibling = gfc_current_ns;
4477 gfc_global_ns_list = gfc_current_ns;
4479 next = gfc_current_ns;
4486 if (!gfc_option.flag_whole_file)
4489 /* Do the resolution. */
4490 resolve_all_program_units (gfc_global_ns_list);
4492 /* Do the parse tree dump. */
4494 = gfc_option.dump_fortran_original ? gfc_global_ns_list : NULL;
4496 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4497 if (!gfc_current_ns->proc_name
4498 || gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
4500 gfc_dump_parse_tree (gfc_current_ns, stdout);
4501 fputs ("------------------------------------------\n\n", stdout);
4504 /* Do the translation. */
4505 translate_all_program_units (gfc_global_ns_list, seen_program);
4509 gfc_end_source_files ();
4513 /* If we see a duplicate main program, shut down. If the second
4514 instance is an implied main program, i.e. data decls or executable
4515 statements, we're in for lots of errors. */
4516 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4517 reject_statement ();