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 ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
403 match ("module", gfc_match_module, ST_MODULE);
407 match ("nullify", gfc_match_nullify, ST_NULLIFY);
408 match ("namelist", gfc_match_namelist, ST_NAMELIST);
412 match ("open", gfc_match_open, ST_OPEN);
413 match ("optional", gfc_match_optional, ST_ATTR_DECL);
417 match ("print", gfc_match_print, ST_WRITE);
418 match ("parameter", gfc_match_parameter, ST_PARAMETER);
419 match ("pause", gfc_match_pause, ST_PAUSE);
420 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
421 if (gfc_match_private (&st) == MATCH_YES)
423 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
424 match ("program", gfc_match_program, ST_PROGRAM);
425 if (gfc_match_public (&st) == MATCH_YES)
427 match ("protected", gfc_match_protected, ST_ATTR_DECL);
431 match ("read", gfc_match_read, ST_READ);
432 match ("return", gfc_match_return, ST_RETURN);
433 match ("rewind", gfc_match_rewind, ST_REWIND);
437 match ("sequence", gfc_match_eos, ST_SEQUENCE);
438 match ("stop", gfc_match_stop, ST_STOP);
439 match ("save", gfc_match_save, ST_ATTR_DECL);
440 match ("sync all", gfc_match_sync_all, ST_SYNC_ALL);
441 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
442 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
446 match ("target", gfc_match_target, ST_ATTR_DECL);
447 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
448 match ("type is", gfc_match_type_is, ST_TYPE_IS);
452 match ("use", gfc_match_use, ST_USE);
456 match ("value", gfc_match_value, ST_ATTR_DECL);
457 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
461 match ("wait", gfc_match_wait, ST_WAIT);
462 match ("write", gfc_match_write, ST_WRITE);
466 /* All else has failed, so give up. See if any of the matchers has
467 stored an error message of some sort. */
469 if (gfc_error_check () == 0)
470 gfc_error_now ("Unclassifiable statement at %C");
474 gfc_error_recovery ();
480 decode_omp_directive (void)
485 gfc_enforce_clean_symbol_state ();
487 gfc_clear_error (); /* Clear any pending errors. */
488 gfc_clear_warning (); /* Clear any pending warnings. */
492 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
493 "or ELEMENTAL procedures");
494 gfc_error_recovery ();
498 old_locus = gfc_current_locus;
500 /* General OpenMP directive matching: Instead of testing every possible
501 statement, we eliminate most possibilities by peeking at the
504 c = gfc_peek_ascii_char ();
509 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
512 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
515 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
518 match ("do", gfc_match_omp_do, ST_OMP_DO);
521 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
522 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
523 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
524 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
525 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
526 match ("end parallel sections", gfc_match_omp_eos,
527 ST_OMP_END_PARALLEL_SECTIONS);
528 match ("end parallel workshare", gfc_match_omp_eos,
529 ST_OMP_END_PARALLEL_WORKSHARE);
530 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
531 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
532 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
533 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
534 match ("end workshare", gfc_match_omp_end_nowait,
535 ST_OMP_END_WORKSHARE);
538 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
541 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
544 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
547 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
548 match ("parallel sections", gfc_match_omp_parallel_sections,
549 ST_OMP_PARALLEL_SECTIONS);
550 match ("parallel workshare", gfc_match_omp_parallel_workshare,
551 ST_OMP_PARALLEL_WORKSHARE);
552 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
555 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
556 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
557 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
560 match ("task", gfc_match_omp_task, ST_OMP_TASK);
561 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
562 match ("threadprivate", gfc_match_omp_threadprivate,
563 ST_OMP_THREADPRIVATE);
565 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
569 /* All else has failed, so give up. See if any of the matchers has
570 stored an error message of some sort. */
572 if (gfc_error_check () == 0)
573 gfc_error_now ("Unclassifiable OpenMP directive at %C");
577 gfc_error_recovery ();
583 decode_gcc_attribute (void)
587 gfc_enforce_clean_symbol_state ();
589 gfc_clear_error (); /* Clear any pending errors. */
590 gfc_clear_warning (); /* Clear any pending warnings. */
591 old_locus = gfc_current_locus;
593 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
595 /* All else has failed, so give up. See if any of the matchers has
596 stored an error message of some sort. */
598 if (gfc_error_check () == 0)
599 gfc_error_now ("Unclassifiable GCC directive at %C");
603 gfc_error_recovery ();
611 /* Get the next statement in free form source. */
620 at_bol = gfc_at_bol ();
621 gfc_gobble_whitespace ();
623 c = gfc_peek_ascii_char ();
629 /* Found a statement label? */
630 m = gfc_match_st_label (&gfc_statement_label);
632 d = gfc_peek_ascii_char ();
633 if (m != MATCH_YES || !gfc_is_whitespace (d))
635 gfc_match_small_literal_int (&i, &cnt);
638 gfc_error_now ("Too many digits in statement label at %C");
641 gfc_error_now ("Zero is not a valid statement label at %C");
644 c = gfc_next_ascii_char ();
647 if (!gfc_is_whitespace (c))
648 gfc_error_now ("Non-numeric character in statement label at %C");
654 label_locus = gfc_current_locus;
656 gfc_gobble_whitespace ();
658 if (at_bol && gfc_peek_ascii_char () == ';')
660 gfc_error_now ("Semicolon at %C needs to be preceded by "
662 gfc_next_ascii_char (); /* Eat up the semicolon. */
666 if (gfc_match_eos () == MATCH_YES)
668 gfc_warning_now ("Ignoring statement label in empty statement "
669 "at %L", &label_locus);
670 gfc_free_st_label (gfc_statement_label);
671 gfc_statement_label = NULL;
678 /* Comments have already been skipped by the time we get here,
679 except for GCC attributes and OpenMP directives. */
681 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
682 c = gfc_peek_ascii_char ();
688 c = gfc_next_ascii_char ();
689 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
690 gcc_assert (c == "gcc$"[i]);
692 gfc_gobble_whitespace ();
693 return decode_gcc_attribute ();
696 else if (c == '$' && gfc_option.flag_openmp)
700 c = gfc_next_ascii_char ();
701 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
702 gcc_assert (c == "$omp"[i]);
704 gcc_assert (c == ' ' || c == '\t');
705 gfc_gobble_whitespace ();
706 return decode_omp_directive ();
712 if (at_bol && c == ';')
714 if (!(gfc_option.allow_std & GFC_STD_F2008))
715 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
717 gfc_next_ascii_char (); /* Eat up the semicolon. */
721 return decode_statement ();
725 /* Get the next statement in fixed-form source. */
730 int label, digit_flag, i;
735 return decode_statement ();
737 /* Skip past the current label field, parsing a statement label if
738 one is there. This is a weird number parser, since the number is
739 contained within five columns and can have any kind of embedded
740 spaces. We also check for characters that make the rest of the
746 for (i = 0; i < 5; i++)
748 c = gfc_next_char_literal (0);
765 label = label * 10 + ((unsigned char) c - '0');
766 label_locus = gfc_current_locus;
770 /* Comments have already been skipped by the time we get
771 here, except for GCC attributes and OpenMP directives. */
774 c = gfc_next_char_literal (0);
776 if (TOLOWER (c) == 'g')
778 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
779 gcc_assert (TOLOWER (c) == "gcc$"[i]);
781 return decode_gcc_attribute ();
783 else if (c == '$' && gfc_option.flag_openmp)
785 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
786 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
788 if (c != ' ' && c != '0')
790 gfc_buffer_error (0);
791 gfc_error ("Bad continuation line at %C");
795 return decode_omp_directive ();
799 /* Comments have already been skipped by the time we get
800 here so don't bother checking for them. */
803 gfc_buffer_error (0);
804 gfc_error ("Non-numeric character in statement label at %C");
812 gfc_warning_now ("Zero is not a valid statement label at %C");
815 /* We've found a valid statement label. */
816 gfc_statement_label = gfc_get_st_label (label);
820 /* Since this line starts a statement, it cannot be a continuation
821 of a previous statement. If we see something here besides a
822 space or zero, it must be a bad continuation line. */
824 c = gfc_next_char_literal (0);
828 if (c != ' ' && c != '0')
830 gfc_buffer_error (0);
831 gfc_error ("Bad continuation line at %C");
835 /* Now that we've taken care of the statement label columns, we have
836 to make sure that the first nonblank character is not a '!'. If
837 it is, the rest of the line is a comment. */
841 loc = gfc_current_locus;
842 c = gfc_next_char_literal (0);
844 while (gfc_is_whitespace (c));
848 gfc_current_locus = loc;
853 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
854 else if (!(gfc_option.allow_std & GFC_STD_F2008))
855 gfc_error_now ("Fortran 2008: Semicolon at %C without preceding "
860 if (gfc_match_eos () == MATCH_YES)
863 /* At this point, we've got a nonblank statement to parse. */
864 return decode_statement ();
868 gfc_warning_now ("Ignoring statement label in empty statement at %L",
871 gfc_current_locus.lb->truncated = 0;
877 /* Return the next non-ST_NONE statement to the caller. We also worry
878 about including files and the ends of include files at this stage. */
881 next_statement (void)
886 gfc_enforce_clean_symbol_state ();
888 gfc_new_block = NULL;
890 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
891 gfc_current_ns->old_equiv = gfc_current_ns->equiv;
894 gfc_statement_label = NULL;
895 gfc_buffer_error (1);
900 gfc_skip_comments ();
908 if (gfc_define_undef_line ())
911 old_locus = gfc_current_locus;
913 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
919 gfc_buffer_error (0);
921 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
923 gfc_free_st_label (gfc_statement_label);
924 gfc_statement_label = NULL;
925 gfc_current_locus = old_locus;
929 check_statement_label (st);
935 /****************************** Parser ***********************************/
937 /* The parser subroutines are of type 'try' that fail if the file ends
940 /* Macros that expand to case-labels for various classes of
941 statements. Start with executable statements that directly do
944 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
945 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
946 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
947 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
948 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
949 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
950 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
951 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
952 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT: case ST_ERROR_STOP: \
953 case ST_SYNC_ALL: case ST_SYNC_IMAGES: case ST_SYNC_MEMORY
955 /* Statements that mark other executable statements. */
957 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: \
958 case ST_IF_BLOCK: case ST_BLOCK: case ST_ASSOCIATE: \
959 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_SELECT_TYPE: \
960 case ST_OMP_PARALLEL: \
961 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
962 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
963 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
964 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
965 case ST_OMP_TASK: case ST_CRITICAL
967 /* Declaration statements */
969 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
970 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
971 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
974 /* Block end statements. Errors associated with interchanging these
975 are detected in gfc_match_end(). */
977 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
978 case ST_END_PROGRAM: case ST_END_SUBROUTINE: \
979 case ST_END_BLOCK: case ST_END_ASSOCIATE
982 /* Push a new state onto the stack. */
985 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
987 p->state = new_state;
988 p->previous = gfc_state_stack;
990 p->head = p->tail = NULL;
991 p->do_variable = NULL;
993 /* If this the state of a construct like BLOCK, DO or IF, the corresponding
994 construct statement was accepted right before pushing the state. Thus,
995 the construct's gfc_code is available as tail of the parent state. */
996 gcc_assert (gfc_state_stack);
997 p->construct = gfc_state_stack->tail;
1003 /* Pop the current state. */
1007 gfc_state_stack = gfc_state_stack->previous;
1011 /* Try to find the given state in the state stack. */
1014 gfc_find_state (gfc_compile_state state)
1018 for (p = gfc_state_stack; p; p = p->previous)
1019 if (p->state == state)
1022 return (p == NULL) ? FAILURE : SUCCESS;
1026 /* Starts a new level in the statement list. */
1029 new_level (gfc_code *q)
1033 p = q->block = gfc_get_code ();
1035 gfc_state_stack->head = gfc_state_stack->tail = p;
1041 /* Add the current new_st code structure and adds it to the current
1042 program unit. As a side-effect, it zeroes the new_st. */
1045 add_statement (void)
1049 p = gfc_get_code ();
1052 p->loc = gfc_current_locus;
1054 if (gfc_state_stack->head == NULL)
1055 gfc_state_stack->head = p;
1057 gfc_state_stack->tail->next = p;
1059 while (p->next != NULL)
1062 gfc_state_stack->tail = p;
1064 gfc_clear_new_st ();
1070 /* Frees everything associated with the current statement. */
1073 undo_new_statement (void)
1075 gfc_free_statements (new_st.block);
1076 gfc_free_statements (new_st.next);
1077 gfc_free_statement (&new_st);
1078 gfc_clear_new_st ();
1082 /* If the current statement has a statement label, make sure that it
1083 is allowed to, or should have one. */
1086 check_statement_label (gfc_statement st)
1090 if (gfc_statement_label == NULL)
1092 if (st == ST_FORMAT)
1093 gfc_error ("FORMAT statement at %L does not have a statement label",
1100 case ST_END_PROGRAM:
1101 case ST_END_FUNCTION:
1102 case ST_END_SUBROUTINE:
1106 case ST_END_CRITICAL:
1109 type = ST_LABEL_TARGET;
1113 type = ST_LABEL_FORMAT;
1116 /* Statement labels are not restricted from appearing on a
1117 particular line. However, there are plenty of situations
1118 where the resulting label can't be referenced. */
1121 type = ST_LABEL_BAD_TARGET;
1125 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1127 new_st.here = gfc_statement_label;
1131 /* Figures out what the enclosing program unit is. This will be a
1132 function, subroutine, program, block data or module. */
1135 gfc_enclosing_unit (gfc_compile_state * result)
1139 for (p = gfc_state_stack; p; p = p->previous)
1140 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1141 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1142 || p->state == COMP_PROGRAM)
1151 *result = COMP_PROGRAM;
1156 /* Translate a statement enum to a string. */
1159 gfc_ascii_statement (gfc_statement st)
1165 case ST_ARITHMETIC_IF:
1166 p = _("arithmetic IF");
1175 p = _("attribute declaration");
1211 p = _("data declaration");
1219 case ST_DERIVED_DECL:
1220 p = _("derived type declaration");
1234 case ST_END_ASSOCIATE:
1235 p = "END ASSOCIATE";
1240 case ST_END_BLOCK_DATA:
1241 p = "END BLOCK DATA";
1243 case ST_END_CRITICAL:
1255 case ST_END_FUNCTION:
1261 case ST_END_INTERFACE:
1262 p = "END INTERFACE";
1267 case ST_END_PROGRAM:
1273 case ST_END_SUBROUTINE:
1274 p = "END SUBROUTINE";
1285 case ST_EQUIVALENCE:
1297 case ST_FORALL_BLOCK: /* Fall through */
1319 case ST_IMPLICIT_NONE:
1320 p = "IMPLICIT NONE";
1322 case ST_IMPLIED_ENDDO:
1323 p = _("implied END DO");
1349 case ST_MODULE_PROC:
1350 p = "MODULE PROCEDURE";
1382 case ST_SYNC_IMAGES:
1385 case ST_SYNC_MEMORY:
1397 case ST_WHERE_BLOCK: /* Fall through */
1408 p = _("assignment");
1410 case ST_POINTER_ASSIGNMENT:
1411 p = _("pointer assignment");
1413 case ST_SELECT_CASE:
1416 case ST_SELECT_TYPE:
1431 case ST_STATEMENT_FUNCTION:
1432 p = "STATEMENT FUNCTION";
1434 case ST_LABEL_ASSIGNMENT:
1435 p = "LABEL ASSIGNMENT";
1438 p = "ENUM DEFINITION";
1441 p = "ENUMERATOR DEFINITION";
1449 case ST_OMP_BARRIER:
1450 p = "!$OMP BARRIER";
1452 case ST_OMP_CRITICAL:
1453 p = "!$OMP CRITICAL";
1458 case ST_OMP_END_CRITICAL:
1459 p = "!$OMP END CRITICAL";
1464 case ST_OMP_END_MASTER:
1465 p = "!$OMP END MASTER";
1467 case ST_OMP_END_ORDERED:
1468 p = "!$OMP END ORDERED";
1470 case ST_OMP_END_PARALLEL:
1471 p = "!$OMP END PARALLEL";
1473 case ST_OMP_END_PARALLEL_DO:
1474 p = "!$OMP END PARALLEL DO";
1476 case ST_OMP_END_PARALLEL_SECTIONS:
1477 p = "!$OMP END PARALLEL SECTIONS";
1479 case ST_OMP_END_PARALLEL_WORKSHARE:
1480 p = "!$OMP END PARALLEL WORKSHARE";
1482 case ST_OMP_END_SECTIONS:
1483 p = "!$OMP END SECTIONS";
1485 case ST_OMP_END_SINGLE:
1486 p = "!$OMP END SINGLE";
1488 case ST_OMP_END_TASK:
1489 p = "!$OMP END TASK";
1491 case ST_OMP_END_WORKSHARE:
1492 p = "!$OMP END WORKSHARE";
1500 case ST_OMP_ORDERED:
1501 p = "!$OMP ORDERED";
1503 case ST_OMP_PARALLEL:
1504 p = "!$OMP PARALLEL";
1506 case ST_OMP_PARALLEL_DO:
1507 p = "!$OMP PARALLEL DO";
1509 case ST_OMP_PARALLEL_SECTIONS:
1510 p = "!$OMP PARALLEL SECTIONS";
1512 case ST_OMP_PARALLEL_WORKSHARE:
1513 p = "!$OMP PARALLEL WORKSHARE";
1515 case ST_OMP_SECTIONS:
1516 p = "!$OMP SECTIONS";
1518 case ST_OMP_SECTION:
1519 p = "!$OMP SECTION";
1527 case ST_OMP_TASKWAIT:
1528 p = "!$OMP TASKWAIT";
1530 case ST_OMP_THREADPRIVATE:
1531 p = "!$OMP THREADPRIVATE";
1533 case ST_OMP_WORKSHARE:
1534 p = "!$OMP WORKSHARE";
1537 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1544 /* Create a symbol for the main program and assign it to ns->proc_name. */
1547 main_program_symbol (gfc_namespace *ns, const char *name)
1549 gfc_symbol *main_program;
1550 symbol_attribute attr;
1552 gfc_get_symbol (name, ns, &main_program);
1553 gfc_clear_attr (&attr);
1554 attr.flavor = FL_PROGRAM;
1555 attr.proc = PROC_UNKNOWN;
1556 attr.subroutine = 1;
1557 attr.access = ACCESS_PUBLIC;
1558 attr.is_main_program = 1;
1559 main_program->attr = attr;
1560 main_program->declared_at = gfc_current_locus;
1561 ns->proc_name = main_program;
1562 gfc_commit_symbols ();
1566 /* Do whatever is necessary to accept the last statement. */
1569 accept_statement (gfc_statement st)
1577 case ST_IMPLICIT_NONE:
1578 gfc_set_implicit_none ();
1587 gfc_current_ns->proc_name = gfc_new_block;
1590 /* If the statement is the end of a block, lay down a special code
1591 that allows a branch to the end of the block from within the
1592 construct. IF and SELECT are treated differently from DO
1593 (where EXEC_NOP is added inside the loop) for two
1595 1. END DO has a meaning in the sense that after a GOTO to
1596 it, the loop counter must be increased.
1597 2. IF blocks and SELECT blocks can consist of multiple
1598 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1599 Putting the label before the END IF would make the jump
1600 from, say, the ELSE IF block to the END IF illegal. */
1604 case ST_END_CRITICAL:
1605 if (gfc_statement_label != NULL)
1607 new_st.op = EXEC_END_BLOCK;
1612 /* The end-of-program unit statements do not get the special
1613 marker and require a statement of some sort if they are a
1616 case ST_END_PROGRAM:
1617 case ST_END_FUNCTION:
1618 case ST_END_SUBROUTINE:
1619 if (gfc_statement_label != NULL)
1621 new_st.op = EXEC_RETURN;
1626 new_st.op = EXEC_END_PROCEDURE;
1642 gfc_commit_symbols ();
1643 gfc_warning_check ();
1644 gfc_clear_new_st ();
1648 /* Undo anything tentative that has been built for the current
1652 reject_statement (void)
1654 /* Revert to the previous charlen chain. */
1655 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1656 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1658 gfc_free_equiv_until (gfc_current_ns->equiv, gfc_current_ns->old_equiv);
1659 gfc_current_ns->equiv = gfc_current_ns->old_equiv;
1661 gfc_new_block = NULL;
1662 gfc_undo_symbols ();
1663 gfc_clear_warning ();
1664 undo_new_statement ();
1668 /* Generic complaint about an out of order statement. We also do
1669 whatever is necessary to clean up. */
1672 unexpected_statement (gfc_statement st)
1674 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1676 reject_statement ();
1680 /* Given the next statement seen by the matcher, make sure that it is
1681 in proper order with the last. This subroutine is initialized by
1682 calling it with an argument of ST_NONE. If there is a problem, we
1683 issue an error and return FAILURE. Otherwise we return SUCCESS.
1685 Individual parsers need to verify that the statements seen are
1686 valid before calling here, i.e., ENTRY statements are not allowed in
1687 INTERFACE blocks. The following diagram is taken from the standard:
1689 +---------------------------------------+
1690 | program subroutine function module |
1691 +---------------------------------------+
1693 +---------------------------------------+
1695 +---------------------------------------+
1697 | +-----------+------------------+
1698 | | parameter | implicit |
1699 | +-----------+------------------+
1700 | format | | derived type |
1701 | entry | parameter | interface |
1702 | | data | specification |
1703 | | | statement func |
1704 | +-----------+------------------+
1705 | | data | executable |
1706 +--------+-----------+------------------+
1708 +---------------------------------------+
1709 | internal module/subprogram |
1710 +---------------------------------------+
1712 +---------------------------------------+
1721 ORDER_IMPLICIT_NONE,
1729 enum state_order state;
1730 gfc_statement last_statement;
1736 verify_st_order (st_state *p, gfc_statement st, bool silent)
1742 p->state = ORDER_START;
1746 if (p->state > ORDER_USE)
1748 p->state = ORDER_USE;
1752 if (p->state > ORDER_IMPORT)
1754 p->state = ORDER_IMPORT;
1757 case ST_IMPLICIT_NONE:
1758 if (p->state > ORDER_IMPLICIT_NONE)
1761 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1762 statement disqualifies a USE but not an IMPLICIT NONE.
1763 Duplicate IMPLICIT NONEs are caught when the implicit types
1766 p->state = ORDER_IMPLICIT_NONE;
1770 if (p->state > ORDER_IMPLICIT)
1772 p->state = ORDER_IMPLICIT;
1777 if (p->state < ORDER_IMPLICIT_NONE)
1778 p->state = ORDER_IMPLICIT_NONE;
1782 if (p->state >= ORDER_EXEC)
1784 if (p->state < ORDER_IMPLICIT)
1785 p->state = ORDER_IMPLICIT;
1789 if (p->state < ORDER_SPEC)
1790 p->state = ORDER_SPEC;
1795 case ST_DERIVED_DECL:
1797 if (p->state >= ORDER_EXEC)
1799 if (p->state < ORDER_SPEC)
1800 p->state = ORDER_SPEC;
1805 if (p->state < ORDER_EXEC)
1806 p->state = ORDER_EXEC;
1810 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1811 gfc_ascii_statement (st));
1814 /* All is well, record the statement in case we need it next time. */
1815 p->where = gfc_current_locus;
1816 p->last_statement = st;
1821 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1822 gfc_ascii_statement (st),
1823 gfc_ascii_statement (p->last_statement), &p->where);
1829 /* Handle an unexpected end of file. This is a show-stopper... */
1831 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1834 unexpected_eof (void)
1838 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1840 /* Memory cleanup. Move to "second to last". */
1841 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1844 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1847 longjmp (eof_buf, 1);
1851 /* Parse the CONTAINS section of a derived type definition. */
1853 gfc_access gfc_typebound_default_access;
1856 parse_derived_contains (void)
1859 bool seen_private = false;
1860 bool seen_comps = false;
1861 bool error_flag = false;
1864 gcc_assert (gfc_current_state () == COMP_DERIVED);
1865 gcc_assert (gfc_current_block ());
1867 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1869 if (gfc_current_block ()->attr.sequence)
1870 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1871 " section at %C", gfc_current_block ()->name);
1872 if (gfc_current_block ()->attr.is_bind_c)
1873 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1874 " section at %C", gfc_current_block ()->name);
1876 accept_statement (ST_CONTAINS);
1877 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1879 gfc_typebound_default_access = ACCESS_PUBLIC;
1885 st = next_statement ();
1893 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1897 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1898 " procedure at %C") == FAILURE)
1901 accept_statement (ST_PROCEDURE);
1906 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1907 " at %C") == FAILURE)
1910 accept_statement (ST_GENERIC);
1915 if (gfc_notify_std (GFC_STD_F2003,
1916 "Fortran 2003: FINAL procedure declaration"
1917 " at %C") == FAILURE)
1920 accept_statement (ST_FINAL);
1928 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1929 "definition at %C with empty CONTAINS "
1930 "section") == FAILURE))
1933 /* ST_END_TYPE is accepted by parse_derived after return. */
1937 if (gfc_find_state (COMP_MODULE) == FAILURE)
1939 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1946 gfc_error ("PRIVATE statement at %C must precede procedure"
1953 gfc_error ("Duplicate PRIVATE statement at %C");
1957 accept_statement (ST_PRIVATE);
1958 gfc_typebound_default_access = ACCESS_PRIVATE;
1959 seen_private = true;
1963 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1967 gfc_error ("Already inside a CONTAINS block at %C");
1971 unexpected_statement (st);
1979 reject_statement ();
1983 gcc_assert (gfc_current_state () == COMP_DERIVED);
1989 /* Parse a derived type. */
1992 parse_derived (void)
1994 int compiling_type, seen_private, seen_sequence, seen_component;
2000 accept_statement (ST_DERIVED_DECL);
2001 push_state (&s, COMP_DERIVED, gfc_new_block);
2003 gfc_new_block->component_access = ACCESS_PUBLIC;
2010 while (compiling_type)
2012 st = next_statement ();
2020 accept_statement (st);
2025 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
2032 if (!seen_component)
2033 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
2034 "definition at %C without components");
2036 accept_statement (ST_END_TYPE);
2040 if (gfc_find_state (COMP_MODULE) == FAILURE)
2042 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2049 gfc_error ("PRIVATE statement at %C must precede "
2050 "structure components");
2055 gfc_error ("Duplicate PRIVATE statement at %C");
2057 s.sym->component_access = ACCESS_PRIVATE;
2059 accept_statement (ST_PRIVATE);
2066 gfc_error ("SEQUENCE statement at %C must precede "
2067 "structure components");
2071 if (gfc_current_block ()->attr.sequence)
2072 gfc_warning ("SEQUENCE attribute at %C already specified in "
2077 gfc_error ("Duplicate SEQUENCE statement at %C");
2081 gfc_add_sequence (&gfc_current_block ()->attr,
2082 gfc_current_block ()->name, NULL);
2086 gfc_notify_std (GFC_STD_F2003,
2087 "Fortran 2003: CONTAINS block in derived type"
2088 " definition at %C");
2090 accept_statement (ST_CONTAINS);
2091 parse_derived_contains ();
2095 unexpected_statement (st);
2100 /* need to verify that all fields of the derived type are
2101 * interoperable with C if the type is declared to be bind(c)
2103 sym = gfc_current_block ();
2104 for (c = sym->components; c; c = c->next)
2106 /* Look for allocatable components. */
2107 if (c->attr.allocatable
2108 || (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.allocatable)
2109 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2110 sym->attr.alloc_comp = 1;
2112 /* Look for pointer components. */
2114 || (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.class_pointer)
2115 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2116 sym->attr.pointer_comp = 1;
2118 /* Look for procedure pointer components. */
2119 if (c->attr.proc_pointer
2120 || (c->ts.type == BT_DERIVED
2121 && c->ts.u.derived->attr.proc_pointer_comp))
2122 sym->attr.proc_pointer_comp = 1;
2124 /* Looking for coarray components. */
2125 if (c->attr.codimension
2126 || (c->attr.coarray_comp && !c->attr.pointer && !c->attr.allocatable))
2127 sym->attr.coarray_comp = 1;
2129 /* Look for private components. */
2130 if (sym->component_access == ACCESS_PRIVATE
2131 || c->attr.access == ACCESS_PRIVATE
2132 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2133 sym->attr.private_comp = 1;
2136 if (!seen_component)
2137 sym->attr.zero_comp = 1;
2143 /* Parse an ENUM. */
2151 int seen_enumerator = 0;
2153 push_state (&s, COMP_ENUM, gfc_new_block);
2157 while (compiling_enum)
2159 st = next_statement ();
2167 seen_enumerator = 1;
2168 accept_statement (st);
2173 if (!seen_enumerator)
2174 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2175 accept_statement (st);
2179 gfc_free_enum_history ();
2180 unexpected_statement (st);
2188 /* Parse an interface. We must be able to deal with the possibility
2189 of recursive interfaces. The parse_spec() subroutine is mutually
2190 recursive with parse_interface(). */
2192 static gfc_statement parse_spec (gfc_statement);
2195 parse_interface (void)
2197 gfc_compile_state new_state = COMP_NONE, current_state;
2198 gfc_symbol *prog_unit, *sym;
2199 gfc_interface_info save;
2200 gfc_state_data s1, s2;
2204 accept_statement (ST_INTERFACE);
2206 current_interface.ns = gfc_current_ns;
2207 save = current_interface;
2209 sym = (current_interface.type == INTERFACE_GENERIC
2210 || current_interface.type == INTERFACE_USER_OP)
2211 ? gfc_new_block : NULL;
2213 push_state (&s1, COMP_INTERFACE, sym);
2214 current_state = COMP_NONE;
2217 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2219 st = next_statement ();
2227 if (st == ST_SUBROUTINE)
2228 new_state = COMP_SUBROUTINE;
2229 else if (st == ST_FUNCTION)
2230 new_state = COMP_FUNCTION;
2231 if (gfc_new_block->attr.pointer)
2233 gfc_new_block->attr.pointer = 0;
2234 gfc_new_block->attr.proc_pointer = 1;
2236 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2237 gfc_new_block->formal, NULL) == FAILURE)
2239 reject_statement ();
2240 gfc_free_namespace (gfc_current_ns);
2246 case ST_MODULE_PROC: /* The module procedure matcher makes
2247 sure the context is correct. */
2248 accept_statement (st);
2249 gfc_free_namespace (gfc_current_ns);
2252 case ST_END_INTERFACE:
2253 gfc_free_namespace (gfc_current_ns);
2254 gfc_current_ns = current_interface.ns;
2258 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2259 gfc_ascii_statement (st));
2260 reject_statement ();
2261 gfc_free_namespace (gfc_current_ns);
2266 /* Make sure that a generic interface has only subroutines or
2267 functions and that the generic name has the right attribute. */
2268 if (current_interface.type == INTERFACE_GENERIC)
2270 if (current_state == COMP_NONE)
2272 if (new_state == COMP_FUNCTION && sym)
2273 gfc_add_function (&sym->attr, sym->name, NULL);
2274 else if (new_state == COMP_SUBROUTINE && sym)
2275 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2277 current_state = new_state;
2281 if (new_state != current_state)
2283 if (new_state == COMP_SUBROUTINE)
2284 gfc_error ("SUBROUTINE at %C does not belong in a "
2285 "generic function interface");
2287 if (new_state == COMP_FUNCTION)
2288 gfc_error ("FUNCTION at %C does not belong in a "
2289 "generic subroutine interface");
2294 if (current_interface.type == INTERFACE_ABSTRACT)
2296 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2297 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2298 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2299 "cannot be the same as an intrinsic type",
2300 gfc_new_block->name);
2303 push_state (&s2, new_state, gfc_new_block);
2304 accept_statement (st);
2305 prog_unit = gfc_new_block;
2306 prog_unit->formal_ns = gfc_current_ns;
2307 proc_locus = gfc_current_locus;
2310 /* Read data declaration statements. */
2311 st = parse_spec (ST_NONE);
2313 /* Since the interface block does not permit an IMPLICIT statement,
2314 the default type for the function or the result must be taken
2315 from the formal namespace. */
2316 if (new_state == COMP_FUNCTION)
2318 if (prog_unit->result == prog_unit
2319 && prog_unit->ts.type == BT_UNKNOWN)
2320 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2321 else if (prog_unit->result != prog_unit
2322 && prog_unit->result->ts.type == BT_UNKNOWN)
2323 gfc_set_default_type (prog_unit->result, 1,
2324 prog_unit->formal_ns);
2327 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2329 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2330 gfc_ascii_statement (st));
2331 reject_statement ();
2335 /* Add EXTERNAL attribute to function or subroutine. */
2336 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2337 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2339 current_interface = save;
2340 gfc_add_interface (prog_unit);
2343 if (current_interface.ns
2344 && current_interface.ns->proc_name
2345 && strcmp (current_interface.ns->proc_name->name,
2346 prog_unit->name) == 0)
2347 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2348 "enclosing procedure", prog_unit->name, &proc_locus);
2357 /* Associate function characteristics by going back to the function
2358 declaration and rematching the prefix. */
2361 match_deferred_characteristics (gfc_typespec * ts)
2364 match m = MATCH_ERROR;
2365 char name[GFC_MAX_SYMBOL_LEN + 1];
2367 loc = gfc_current_locus;
2369 gfc_current_locus = gfc_current_block ()->declared_at;
2372 gfc_buffer_error (1);
2373 m = gfc_match_prefix (ts);
2374 gfc_buffer_error (0);
2376 if (ts->type == BT_DERIVED)
2384 /* Only permit one go at the characteristic association. */
2388 /* Set the function locus correctly. If we have not found the
2389 function name, there is an error. */
2391 && gfc_match ("function% %n", name) == MATCH_YES
2392 && strcmp (name, gfc_current_block ()->name) == 0)
2394 gfc_current_block ()->declared_at = gfc_current_locus;
2395 gfc_commit_symbols ();
2400 gfc_undo_symbols ();
2403 gfc_current_locus =loc;
2408 /* Check specification-expressions in the function result of the currently
2409 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2410 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2411 scope are not yet parsed so this has to be delayed up to parse_spec. */
2414 check_function_result_typed (void)
2416 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2418 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2419 gcc_assert (ts->type != BT_UNKNOWN);
2421 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2422 /* TODO: Extend when KIND type parameters are implemented. */
2423 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2424 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2428 /* Parse a set of specification statements. Returns the statement
2429 that doesn't fit. */
2431 static gfc_statement
2432 parse_spec (gfc_statement st)
2435 bool function_result_typed = false;
2436 bool bad_characteristic = false;
2439 verify_st_order (&ss, ST_NONE, false);
2441 st = next_statement ();
2443 /* If we are not inside a function or don't have a result specified so far,
2444 do nothing special about it. */
2445 if (gfc_current_state () != COMP_FUNCTION)
2446 function_result_typed = true;
2449 gfc_symbol* proc = gfc_current_ns->proc_name;
2452 if (proc->result->ts.type == BT_UNKNOWN)
2453 function_result_typed = true;
2458 /* If we're inside a BLOCK construct, some statements are disallowed.
2459 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2460 or VALUE are also disallowed, but they don't have a particular ST_*
2461 key so we have to check for them individually in their matcher routine. */
2462 if (gfc_current_state () == COMP_BLOCK)
2466 case ST_IMPLICIT_NONE:
2469 case ST_EQUIVALENCE:
2470 case ST_STATEMENT_FUNCTION:
2471 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2472 gfc_ascii_statement (st));
2473 reject_statement ();
2480 /* If we find a statement that can not be followed by an IMPLICIT statement
2481 (and thus we can expect to see none any further), type the function result
2482 if it has not yet been typed. Be careful not to give the END statement
2483 to verify_st_order! */
2484 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2486 bool verify_now = false;
2488 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2493 verify_st_order (&dummyss, ST_NONE, false);
2494 verify_st_order (&dummyss, st, false);
2496 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2502 check_function_result_typed ();
2503 function_result_typed = true;
2512 case ST_IMPLICIT_NONE:
2514 if (!function_result_typed)
2516 check_function_result_typed ();
2517 function_result_typed = true;
2523 case ST_DATA: /* Not allowed in interfaces */
2524 if (gfc_current_state () == COMP_INTERFACE)
2534 case ST_DERIVED_DECL:
2537 if (verify_st_order (&ss, st, false) == FAILURE)
2539 reject_statement ();
2540 st = next_statement ();
2550 case ST_DERIVED_DECL:
2556 if (gfc_current_state () != COMP_MODULE)
2558 gfc_error ("%s statement must appear in a MODULE",
2559 gfc_ascii_statement (st));
2560 reject_statement ();
2564 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2566 gfc_error ("%s statement at %C follows another accessibility "
2567 "specification", gfc_ascii_statement (st));
2568 reject_statement ();
2572 gfc_current_ns->default_access = (st == ST_PUBLIC)
2573 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2577 case ST_STATEMENT_FUNCTION:
2578 if (gfc_current_state () == COMP_MODULE)
2580 unexpected_statement (st);
2588 accept_statement (st);
2589 st = next_statement ();
2593 accept_statement (st);
2595 st = next_statement ();
2598 case ST_GET_FCN_CHARACTERISTICS:
2599 /* This statement triggers the association of a function's result
2601 ts = &gfc_current_block ()->result->ts;
2602 if (match_deferred_characteristics (ts) != MATCH_YES)
2603 bad_characteristic = true;
2605 st = next_statement ();
2612 /* If match_deferred_characteristics failed, then there is an error. */
2613 if (bad_characteristic)
2615 ts = &gfc_current_block ()->result->ts;
2616 if (ts->type != BT_DERIVED)
2617 gfc_error ("Bad kind expression for function '%s' at %L",
2618 gfc_current_block ()->name,
2619 &gfc_current_block ()->declared_at);
2621 gfc_error ("The type for function '%s' at %L is not accessible",
2622 gfc_current_block ()->name,
2623 &gfc_current_block ()->declared_at);
2625 gfc_current_block ()->ts.kind = 0;
2626 /* Keep the derived type; if it's bad, it will be discovered later. */
2627 if (!(ts->type == BT_DERIVED && ts->u.derived))
2628 ts->type = BT_UNKNOWN;
2635 /* Parse a WHERE block, (not a simple WHERE statement). */
2638 parse_where_block (void)
2640 int seen_empty_else;
2645 accept_statement (ST_WHERE_BLOCK);
2646 top = gfc_state_stack->tail;
2648 push_state (&s, COMP_WHERE, gfc_new_block);
2650 d = add_statement ();
2651 d->expr1 = top->expr1;
2657 seen_empty_else = 0;
2661 st = next_statement ();
2667 case ST_WHERE_BLOCK:
2668 parse_where_block ();
2673 accept_statement (st);
2677 if (seen_empty_else)
2679 gfc_error ("ELSEWHERE statement at %C follows previous "
2680 "unmasked ELSEWHERE");
2684 if (new_st.expr1 == NULL)
2685 seen_empty_else = 1;
2687 d = new_level (gfc_state_stack->head);
2689 d->expr1 = new_st.expr1;
2691 accept_statement (st);
2696 accept_statement (st);
2700 gfc_error ("Unexpected %s statement in WHERE block at %C",
2701 gfc_ascii_statement (st));
2702 reject_statement ();
2706 while (st != ST_END_WHERE);
2712 /* Parse a FORALL block (not a simple FORALL statement). */
2715 parse_forall_block (void)
2721 accept_statement (ST_FORALL_BLOCK);
2722 top = gfc_state_stack->tail;
2724 push_state (&s, COMP_FORALL, gfc_new_block);
2726 d = add_statement ();
2727 d->op = EXEC_FORALL;
2732 st = next_statement ();
2737 case ST_POINTER_ASSIGNMENT:
2740 accept_statement (st);
2743 case ST_WHERE_BLOCK:
2744 parse_where_block ();
2747 case ST_FORALL_BLOCK:
2748 parse_forall_block ();
2752 accept_statement (st);
2759 gfc_error ("Unexpected %s statement in FORALL block at %C",
2760 gfc_ascii_statement (st));
2762 reject_statement ();
2766 while (st != ST_END_FORALL);
2772 static gfc_statement parse_executable (gfc_statement);
2774 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2777 parse_if_block (void)
2786 accept_statement (ST_IF_BLOCK);
2788 top = gfc_state_stack->tail;
2789 push_state (&s, COMP_IF, gfc_new_block);
2791 new_st.op = EXEC_IF;
2792 d = add_statement ();
2794 d->expr1 = top->expr1;
2800 st = parse_executable (ST_NONE);
2810 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2811 "statement at %L", &else_locus);
2813 reject_statement ();
2817 d = new_level (gfc_state_stack->head);
2819 d->expr1 = new_st.expr1;
2821 accept_statement (st);
2828 gfc_error ("Duplicate ELSE statements at %L and %C",
2830 reject_statement ();
2835 else_locus = gfc_current_locus;
2837 d = new_level (gfc_state_stack->head);
2840 accept_statement (st);
2848 unexpected_statement (st);
2852 while (st != ST_ENDIF);
2855 accept_statement (st);
2859 /* Parse a SELECT block. */
2862 parse_select_block (void)
2868 accept_statement (ST_SELECT_CASE);
2870 cp = gfc_state_stack->tail;
2871 push_state (&s, COMP_SELECT, gfc_new_block);
2873 /* Make sure that the next statement is a CASE or END SELECT. */
2876 st = next_statement ();
2879 if (st == ST_END_SELECT)
2881 /* Empty SELECT CASE is OK. */
2882 accept_statement (st);
2889 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2892 reject_statement ();
2895 /* At this point, we're got a nonempty select block. */
2896 cp = new_level (cp);
2899 accept_statement (st);
2903 st = parse_executable (ST_NONE);
2910 cp = new_level (gfc_state_stack->head);
2912 gfc_clear_new_st ();
2914 accept_statement (st);
2920 /* Can't have an executable statement because of
2921 parse_executable(). */
2923 unexpected_statement (st);
2927 while (st != ST_END_SELECT);
2930 accept_statement (st);
2934 /* Pop the current selector from the SELECT TYPE stack. */
2937 select_type_pop (void)
2939 gfc_select_type_stack *old = select_type_stack;
2940 select_type_stack = old->prev;
2945 /* Parse a SELECT TYPE construct (F03:R821). */
2948 parse_select_type_block (void)
2954 accept_statement (ST_SELECT_TYPE);
2956 cp = gfc_state_stack->tail;
2957 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
2959 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
2963 st = next_statement ();
2966 if (st == ST_END_SELECT)
2967 /* Empty SELECT CASE is OK. */
2969 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
2972 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
2973 "following SELECT TYPE at %C");
2975 reject_statement ();
2978 /* At this point, we're got a nonempty select block. */
2979 cp = new_level (cp);
2982 accept_statement (st);
2986 st = parse_executable (ST_NONE);
2994 cp = new_level (gfc_state_stack->head);
2996 gfc_clear_new_st ();
2998 accept_statement (st);
3004 /* Can't have an executable statement because of
3005 parse_executable(). */
3007 unexpected_statement (st);
3011 while (st != ST_END_SELECT);
3015 accept_statement (st);
3016 gfc_current_ns = gfc_current_ns->parent;
3021 /* Given a symbol, make sure it is not an iteration variable for a DO
3022 statement. This subroutine is called when the symbol is seen in a
3023 context that causes it to become redefined. If the symbol is an
3024 iterator, we generate an error message and return nonzero. */
3027 gfc_check_do_variable (gfc_symtree *st)
3031 for (s=gfc_state_stack; s; s = s->previous)
3032 if (s->do_variable == st)
3034 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3035 "loop beginning at %L", st->name, &s->head->loc);
3043 /* Checks to see if the current statement label closes an enddo.
3044 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3045 an error) if it incorrectly closes an ENDDO. */
3048 check_do_closure (void)
3052 if (gfc_statement_label == NULL)
3055 for (p = gfc_state_stack; p; p = p->previous)
3056 if (p->state == COMP_DO)
3060 return 0; /* No loops to close */
3062 if (p->ext.end_do_label == gfc_statement_label)
3064 if (p == gfc_state_stack)
3067 gfc_error ("End of nonblock DO statement at %C is within another block");
3071 /* At this point, the label doesn't terminate the innermost loop.
3072 Make sure it doesn't terminate another one. */
3073 for (; p; p = p->previous)
3074 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
3076 gfc_error ("End of nonblock DO statement at %C is interwoven "
3077 "with another DO loop");
3085 /* Parse a series of contained program units. */
3087 static void parse_progunit (gfc_statement);
3090 /* Parse a CRITICAL block. */
3093 parse_critical_block (void)
3099 s.ext.end_do_label = new_st.label1;
3101 accept_statement (ST_CRITICAL);
3102 top = gfc_state_stack->tail;
3104 push_state (&s, COMP_CRITICAL, gfc_new_block);
3106 d = add_statement ();
3107 d->op = EXEC_CRITICAL;
3112 st = parse_executable (ST_NONE);
3120 case ST_END_CRITICAL:
3121 if (s.ext.end_do_label != NULL
3122 && s.ext.end_do_label != gfc_statement_label)
3123 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3124 "match CRITIAL label");
3126 if (gfc_statement_label != NULL)
3128 new_st.op = EXEC_NOP;
3134 unexpected_statement (st);
3138 while (st != ST_END_CRITICAL);
3141 accept_statement (st);
3145 /* Set up the local namespace for a BLOCK construct. */
3148 gfc_build_block_ns (gfc_namespace *parent_ns)
3150 gfc_namespace* my_ns;
3152 my_ns = gfc_get_namespace (parent_ns, 1);
3153 my_ns->construct_entities = 1;
3155 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3156 code generation (so it must not be NULL).
3157 We set its recursive argument if our container procedure is recursive, so
3158 that local variables are accordingly placed on the stack when it
3159 will be necessary. */
3161 my_ns->proc_name = gfc_new_block;
3166 gfc_get_symbol ("block@", my_ns, &my_ns->proc_name);
3167 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3168 my_ns->proc_name->name, NULL);
3169 gcc_assert (t == SUCCESS);
3172 if (parent_ns->proc_name)
3173 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3179 /* Parse a BLOCK construct. */
3182 parse_block_construct (void)
3184 gfc_namespace* my_ns;
3187 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BLOCK construct at %C");
3189 my_ns = gfc_build_block_ns (gfc_current_ns);
3191 new_st.op = EXEC_BLOCK;
3192 new_st.ext.block.ns = my_ns;
3193 new_st.ext.block.assoc = NULL;
3194 accept_statement (ST_BLOCK);
3196 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3197 gfc_current_ns = my_ns;
3199 parse_progunit (ST_NONE);
3201 gfc_current_ns = gfc_current_ns->parent;
3206 /* Parse an ASSOCIATE construct. This is essentially a BLOCK construct
3207 behind the scenes with compiler-generated variables. */
3210 parse_associate (void)
3212 gfc_namespace* my_ns;
3215 gfc_association_list* a;
3217 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ASSOCIATE construct at %C");
3219 my_ns = gfc_build_block_ns (gfc_current_ns);
3221 new_st.op = EXEC_BLOCK;
3222 new_st.ext.block.ns = my_ns;
3223 gcc_assert (new_st.ext.block.assoc);
3225 /* Add all associate-names as BLOCK variables. Creating them is enough
3226 for now, they'll get their values during trans-* phase. */
3227 gfc_current_ns = my_ns;
3228 for (a = new_st.ext.block.assoc; a; a = a->next)
3232 if (gfc_get_sym_tree (a->name, NULL, &a->st, false))
3236 sym->attr.flavor = FL_VARIABLE;
3238 sym->declared_at = a->where;
3239 gfc_set_sym_referenced (sym);
3242 accept_statement (ST_ASSOCIATE);
3243 push_state (&s, COMP_ASSOCIATE, my_ns->proc_name);
3246 st = parse_executable (ST_NONE);
3253 accept_statement (st);
3254 my_ns->code = gfc_state_stack->head;
3258 unexpected_statement (st);
3262 gfc_current_ns = gfc_current_ns->parent;
3267 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3268 handled inside of parse_executable(), because they aren't really
3272 parse_do_block (void)
3279 s.ext.end_do_label = new_st.label1;
3281 if (new_st.ext.iterator != NULL)
3282 stree = new_st.ext.iterator->var->symtree;
3286 accept_statement (ST_DO);
3288 top = gfc_state_stack->tail;
3289 push_state (&s, COMP_DO, gfc_new_block);
3291 s.do_variable = stree;
3293 top->block = new_level (top);
3294 top->block->op = EXEC_DO;
3297 st = parse_executable (ST_NONE);
3305 if (s.ext.end_do_label != NULL
3306 && s.ext.end_do_label != gfc_statement_label)
3307 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3310 if (gfc_statement_label != NULL)
3312 new_st.op = EXEC_NOP;
3317 case ST_IMPLIED_ENDDO:
3318 /* If the do-stmt of this DO construct has a do-construct-name,
3319 the corresponding end-do must be an end-do-stmt (with a matching
3320 name, but in that case we must have seen ST_ENDDO first).
3321 We only complain about this in pedantic mode. */
3322 if (gfc_current_block () != NULL)
3323 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3324 &gfc_current_block()->declared_at);
3329 unexpected_statement (st);
3334 accept_statement (st);
3338 /* Parse the statements of OpenMP do/parallel do. */
3340 static gfc_statement
3341 parse_omp_do (gfc_statement omp_st)
3347 accept_statement (omp_st);
3349 cp = gfc_state_stack->tail;
3350 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3351 np = new_level (cp);
3357 st = next_statement ();
3360 else if (st == ST_DO)
3363 unexpected_statement (st);
3367 if (gfc_statement_label != NULL
3368 && gfc_state_stack->previous != NULL
3369 && gfc_state_stack->previous->state == COMP_DO
3370 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3378 there should be no !$OMP END DO. */
3380 return ST_IMPLIED_ENDDO;
3383 check_do_closure ();
3386 st = next_statement ();
3387 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3389 if (new_st.op == EXEC_OMP_END_NOWAIT)
3390 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3392 gcc_assert (new_st.op == EXEC_NOP);
3393 gfc_clear_new_st ();
3394 gfc_commit_symbols ();
3395 gfc_warning_check ();
3396 st = next_statement ();
3402 /* Parse the statements of OpenMP atomic directive. */
3405 parse_omp_atomic (void)
3411 accept_statement (ST_OMP_ATOMIC);
3413 cp = gfc_state_stack->tail;
3414 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3415 np = new_level (cp);
3421 st = next_statement ();
3424 else if (st == ST_ASSIGNMENT)
3427 unexpected_statement (st);
3430 accept_statement (st);
3436 /* Parse the statements of an OpenMP structured block. */
3439 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3441 gfc_statement st, omp_end_st;
3445 accept_statement (omp_st);
3447 cp = gfc_state_stack->tail;
3448 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3449 np = new_level (cp);
3455 case ST_OMP_PARALLEL:
3456 omp_end_st = ST_OMP_END_PARALLEL;
3458 case ST_OMP_PARALLEL_SECTIONS:
3459 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3461 case ST_OMP_SECTIONS:
3462 omp_end_st = ST_OMP_END_SECTIONS;
3464 case ST_OMP_ORDERED:
3465 omp_end_st = ST_OMP_END_ORDERED;
3467 case ST_OMP_CRITICAL:
3468 omp_end_st = ST_OMP_END_CRITICAL;
3471 omp_end_st = ST_OMP_END_MASTER;
3474 omp_end_st = ST_OMP_END_SINGLE;
3477 omp_end_st = ST_OMP_END_TASK;
3479 case ST_OMP_WORKSHARE:
3480 omp_end_st = ST_OMP_END_WORKSHARE;
3482 case ST_OMP_PARALLEL_WORKSHARE:
3483 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3491 if (workshare_stmts_only)
3493 /* Inside of !$omp workshare, only
3496 where statements and constructs
3497 forall statements and constructs
3501 are allowed. For !$omp critical these
3502 restrictions apply recursively. */
3505 st = next_statement ();
3516 accept_statement (st);
3519 case ST_WHERE_BLOCK:
3520 parse_where_block ();
3523 case ST_FORALL_BLOCK:
3524 parse_forall_block ();
3527 case ST_OMP_PARALLEL:
3528 case ST_OMP_PARALLEL_SECTIONS:
3529 parse_omp_structured_block (st, false);
3532 case ST_OMP_PARALLEL_WORKSHARE:
3533 case ST_OMP_CRITICAL:
3534 parse_omp_structured_block (st, true);
3537 case ST_OMP_PARALLEL_DO:
3538 st = parse_omp_do (st);
3542 parse_omp_atomic ();
3553 st = next_statement ();
3557 st = parse_executable (ST_NONE);
3560 else if (st == ST_OMP_SECTION
3561 && (omp_st == ST_OMP_SECTIONS
3562 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3564 np = new_level (np);
3568 else if (st != omp_end_st)
3569 unexpected_statement (st);
3571 while (st != omp_end_st);
3575 case EXEC_OMP_END_NOWAIT:
3576 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3578 case EXEC_OMP_CRITICAL:
3579 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3580 || (new_st.ext.omp_name != NULL
3581 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3582 gfc_error ("Name after !$omp critical and !$omp end critical does "
3584 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3586 case EXEC_OMP_END_SINGLE:
3587 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3588 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3589 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3590 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3598 gfc_clear_new_st ();
3599 gfc_commit_symbols ();
3600 gfc_warning_check ();
3605 /* Accept a series of executable statements. We return the first
3606 statement that doesn't fit to the caller. Any block statements are
3607 passed on to the correct handler, which usually passes the buck
3610 static gfc_statement
3611 parse_executable (gfc_statement st)
3616 st = next_statement ();
3620 close_flag = check_do_closure ();
3625 case ST_END_PROGRAM:
3628 case ST_END_FUNCTION:
3633 case ST_END_SUBROUTINE:
3638 case ST_SELECT_CASE:
3639 gfc_error ("%s statement at %C cannot terminate a non-block "
3640 "DO loop", gfc_ascii_statement (st));
3656 accept_statement (st);
3657 if (close_flag == 1)
3658 return ST_IMPLIED_ENDDO;
3662 parse_block_construct ();
3673 case ST_SELECT_CASE:
3674 parse_select_block ();
3677 case ST_SELECT_TYPE:
3678 parse_select_type_block();
3683 if (check_do_closure () == 1)
3684 return ST_IMPLIED_ENDDO;
3688 parse_critical_block ();
3691 case ST_WHERE_BLOCK:
3692 parse_where_block ();
3695 case ST_FORALL_BLOCK:
3696 parse_forall_block ();
3699 case ST_OMP_PARALLEL:
3700 case ST_OMP_PARALLEL_SECTIONS:
3701 case ST_OMP_SECTIONS:
3702 case ST_OMP_ORDERED:
3703 case ST_OMP_CRITICAL:
3707 parse_omp_structured_block (st, false);
3710 case ST_OMP_WORKSHARE:
3711 case ST_OMP_PARALLEL_WORKSHARE:
3712 parse_omp_structured_block (st, true);
3716 case ST_OMP_PARALLEL_DO:
3717 st = parse_omp_do (st);
3718 if (st == ST_IMPLIED_ENDDO)
3723 parse_omp_atomic ();
3730 st = next_statement ();
3735 /* Fix the symbols for sibling functions. These are incorrectly added to
3736 the child namespace as the parser didn't know about this procedure. */
3739 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3743 gfc_symbol *old_sym;
3745 sym->attr.referenced = 1;
3746 for (ns = siblings; ns; ns = ns->sibling)
3748 st = gfc_find_symtree (ns->sym_root, sym->name);
3750 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3751 goto fixup_contained;
3753 old_sym = st->n.sym;
3754 if (old_sym->ns == ns
3755 && !old_sym->attr.contained
3757 /* By 14.6.1.3, host association should be excluded
3758 for the following. */
3759 && !(old_sym->attr.external
3760 || (old_sym->ts.type != BT_UNKNOWN
3761 && !old_sym->attr.implicit_type)
3762 || old_sym->attr.flavor == FL_PARAMETER
3763 || old_sym->attr.use_assoc
3764 || old_sym->attr.in_common
3765 || old_sym->attr.in_equivalence
3766 || old_sym->attr.data
3767 || old_sym->attr.dummy
3768 || old_sym->attr.result
3769 || old_sym->attr.dimension
3770 || old_sym->attr.allocatable
3771 || old_sym->attr.intrinsic
3772 || old_sym->attr.generic
3773 || old_sym->attr.flavor == FL_NAMELIST
3774 || old_sym->attr.proc == PROC_ST_FUNCTION))
3776 /* Replace it with the symbol from the parent namespace. */
3780 gfc_release_symbol (old_sym);
3784 /* Do the same for any contained procedures. */
3785 gfc_fixup_sibling_symbols (sym, ns->contained);
3790 parse_contained (int module)
3792 gfc_namespace *ns, *parent_ns, *tmp;
3793 gfc_state_data s1, s2;
3797 int contains_statements = 0;
3800 push_state (&s1, COMP_CONTAINS, NULL);
3801 parent_ns = gfc_current_ns;
3805 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3807 gfc_current_ns->sibling = parent_ns->contained;
3808 parent_ns->contained = gfc_current_ns;
3811 /* Process the next available statement. We come here if we got an error
3812 and rejected the last statement. */
3813 st = next_statement ();
3822 contains_statements = 1;
3823 accept_statement (st);
3826 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3829 /* For internal procedures, create/update the symbol in the
3830 parent namespace. */
3834 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3835 gfc_error ("Contained procedure '%s' at %C is already "
3836 "ambiguous", gfc_new_block->name);
3839 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3840 &gfc_new_block->declared_at) ==
3843 if (st == ST_FUNCTION)
3844 gfc_add_function (&sym->attr, sym->name,
3845 &gfc_new_block->declared_at);
3847 gfc_add_subroutine (&sym->attr, sym->name,
3848 &gfc_new_block->declared_at);
3852 gfc_commit_symbols ();
3855 sym = gfc_new_block;
3857 /* Mark this as a contained function, so it isn't replaced
3858 by other module functions. */
3859 sym->attr.contained = 1;
3860 sym->attr.referenced = 1;
3862 parse_progunit (ST_NONE);
3864 /* Fix up any sibling functions that refer to this one. */
3865 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3866 /* Or refer to any of its alternate entry points. */
3867 for (el = gfc_current_ns->entries; el; el = el->next)
3868 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3870 gfc_current_ns->code = s2.head;
3871 gfc_current_ns = parent_ns;
3876 /* These statements are associated with the end of the host unit. */
3877 case ST_END_FUNCTION:
3879 case ST_END_PROGRAM:
3880 case ST_END_SUBROUTINE:
3881 accept_statement (st);
3885 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3886 gfc_ascii_statement (st));
3887 reject_statement ();
3893 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3894 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3896 /* The first namespace in the list is guaranteed to not have
3897 anything (worthwhile) in it. */
3898 tmp = gfc_current_ns;
3899 gfc_current_ns = parent_ns;
3900 if (seen_error && tmp->refs > 1)
3901 gfc_free_namespace (tmp);
3903 ns = gfc_current_ns->contained;
3904 gfc_current_ns->contained = ns->sibling;
3905 gfc_free_namespace (ns);
3908 if (!contains_statements)
3909 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3910 "FUNCTION or SUBROUTINE statement at %C");
3914 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
3917 parse_progunit (gfc_statement st)
3922 st = parse_spec (st);
3929 /* This is not allowed within BLOCK! */
3930 if (gfc_current_state () != COMP_BLOCK)
3935 accept_statement (st);
3942 if (gfc_current_state () == COMP_FUNCTION)
3943 gfc_check_function_type (gfc_current_ns);
3948 st = parse_executable (st);
3956 /* This is not allowed within BLOCK! */
3957 if (gfc_current_state () != COMP_BLOCK)
3962 accept_statement (st);
3969 unexpected_statement (st);
3970 reject_statement ();
3971 st = next_statement ();
3977 for (p = gfc_state_stack; p; p = p->previous)
3978 if (p->state == COMP_CONTAINS)
3981 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3986 gfc_error ("CONTAINS statement at %C is already in a contained "
3988 reject_statement ();
3989 st = next_statement ();
3993 parse_contained (0);
3996 gfc_current_ns->code = gfc_state_stack->head;
4000 /* Come here to complain about a global symbol already in use as
4004 gfc_global_used (gfc_gsymbol *sym, locus *where)
4009 where = &gfc_current_locus;
4019 case GSYM_SUBROUTINE:
4020 name = "SUBROUTINE";
4025 case GSYM_BLOCK_DATA:
4026 name = "BLOCK DATA";
4032 gfc_internal_error ("gfc_global_used(): Bad type");
4036 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
4037 sym->name, where, name, &sym->where);
4041 /* Parse a block data program unit. */
4044 parse_block_data (void)
4047 static locus blank_locus;
4048 static int blank_block=0;
4051 gfc_current_ns->proc_name = gfc_new_block;
4052 gfc_current_ns->is_block_data = 1;
4054 if (gfc_new_block == NULL)
4057 gfc_error ("Blank BLOCK DATA at %C conflicts with "
4058 "prior BLOCK DATA at %L", &blank_locus);
4062 blank_locus = gfc_current_locus;
4067 s = gfc_get_gsymbol (gfc_new_block->name);
4069 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
4070 gfc_global_used(s, NULL);
4073 s->type = GSYM_BLOCK_DATA;
4074 s->where = gfc_current_locus;
4079 st = parse_spec (ST_NONE);
4081 while (st != ST_END_BLOCK_DATA)
4083 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
4084 gfc_ascii_statement (st));
4085 reject_statement ();
4086 st = next_statement ();
4091 /* Parse a module subprogram. */
4099 s = gfc_get_gsymbol (gfc_new_block->name);
4100 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4101 gfc_global_used(s, NULL);
4104 s->type = GSYM_MODULE;
4105 s->where = gfc_current_locus;
4109 st = parse_spec (ST_NONE);
4118 parse_contained (1);
4122 accept_statement (st);
4126 gfc_error ("Unexpected %s statement in MODULE at %C",
4127 gfc_ascii_statement (st));
4129 reject_statement ();
4130 st = next_statement ();
4134 s->ns = gfc_current_ns;
4138 /* Add a procedure name to the global symbol table. */
4141 add_global_procedure (int sub)
4145 s = gfc_get_gsymbol(gfc_new_block->name);
4148 || (s->type != GSYM_UNKNOWN
4149 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4150 gfc_global_used(s, NULL);
4153 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4154 s->where = gfc_current_locus;
4156 s->ns = gfc_current_ns;
4161 /* Add a program to the global symbol table. */
4164 add_global_program (void)
4168 if (gfc_new_block == NULL)
4170 s = gfc_get_gsymbol (gfc_new_block->name);
4172 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4173 gfc_global_used(s, NULL);
4176 s->type = GSYM_PROGRAM;
4177 s->where = gfc_current_locus;
4179 s->ns = gfc_current_ns;
4184 /* Resolve all the program units when whole file scope option
4187 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4189 gfc_free_dt_list ();
4190 gfc_current_ns = gfc_global_ns_list;
4191 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4193 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4194 gfc_resolve (gfc_current_ns);
4195 gfc_current_ns->derived_types = gfc_derived_types;
4196 gfc_derived_types = NULL;
4202 clean_up_modules (gfc_gsymbol *gsym)
4207 clean_up_modules (gsym->left);
4208 clean_up_modules (gsym->right);
4210 if (gsym->type != GSYM_MODULE || !gsym->ns)
4213 gfc_current_ns = gsym->ns;
4214 gfc_derived_types = gfc_current_ns->derived_types;
4221 /* Translate all the program units when whole file scope option
4222 is active. This could be in a different order to resolution if
4223 there are forward references in the file. */
4225 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
4229 gfc_current_ns = gfc_global_ns_list;
4230 gfc_get_errors (NULL, &errors);
4232 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4234 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4235 gfc_derived_types = gfc_current_ns->derived_types;
4236 gfc_generate_code (gfc_current_ns);
4237 gfc_current_ns->translated = 1;
4240 /* Clean up all the namespaces after translation. */
4241 gfc_current_ns = gfc_global_ns_list;
4242 for (;gfc_current_ns;)
4244 gfc_namespace *ns = gfc_current_ns->sibling;
4245 gfc_derived_types = gfc_current_ns->derived_types;
4247 gfc_current_ns = ns;
4250 clean_up_modules (gfc_gsym_root);
4254 /* Top level parser. */
4257 gfc_parse_file (void)
4259 int seen_program, errors_before, errors;
4260 gfc_state_data top, s;
4263 gfc_namespace *next;
4265 gfc_start_source_files ();
4267 top.state = COMP_NONE;
4269 top.previous = NULL;
4270 top.head = top.tail = NULL;
4271 top.do_variable = NULL;
4273 gfc_state_stack = ⊤
4275 gfc_clear_new_st ();
4277 gfc_statement_label = NULL;
4279 if (setjmp (eof_buf))
4280 return FAILURE; /* Come here on unexpected EOF */
4282 /* Prepare the global namespace that will contain the
4284 gfc_global_ns_list = next = NULL;
4288 /* Exit early for empty files. */
4294 st = next_statement ();
4303 goto duplicate_main;
4305 prog_locus = gfc_current_locus;
4307 push_state (&s, COMP_PROGRAM, gfc_new_block);
4308 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4309 accept_statement (st);
4310 add_global_program ();
4311 parse_progunit (ST_NONE);
4312 if (gfc_option.flag_whole_file)
4317 add_global_procedure (1);
4318 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4319 accept_statement (st);
4320 parse_progunit (ST_NONE);
4321 if (gfc_option.flag_whole_file)
4326 add_global_procedure (0);
4327 push_state (&s, COMP_FUNCTION, gfc_new_block);
4328 accept_statement (st);
4329 parse_progunit (ST_NONE);
4330 if (gfc_option.flag_whole_file)
4335 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4336 accept_statement (st);
4337 parse_block_data ();
4341 push_state (&s, COMP_MODULE, gfc_new_block);
4342 accept_statement (st);
4344 gfc_get_errors (NULL, &errors_before);
4348 /* Anything else starts a nameless main program block. */
4351 goto duplicate_main;
4353 prog_locus = gfc_current_locus;
4355 push_state (&s, COMP_PROGRAM, gfc_new_block);
4356 main_program_symbol (gfc_current_ns, "MAIN__");
4357 parse_progunit (st);
4358 if (gfc_option.flag_whole_file)
4363 /* Handle the non-program units. */
4364 gfc_current_ns->code = s.head;
4366 gfc_resolve (gfc_current_ns);
4368 /* Dump the parse tree if requested. */
4369 if (gfc_option.dump_parse_tree)
4370 gfc_dump_parse_tree (gfc_current_ns, stdout);
4372 gfc_get_errors (NULL, &errors);
4373 if (s.state == COMP_MODULE)
4375 gfc_dump_module (s.sym->name, errors_before == errors);
4377 gfc_generate_module_code (gfc_current_ns);
4379 if (!gfc_option.flag_whole_file)
4383 gfc_current_ns->derived_types = gfc_derived_types;
4384 gfc_derived_types = NULL;
4385 gfc_current_ns = NULL;
4391 gfc_generate_code (gfc_current_ns);
4399 /* The main program and non-contained procedures are put
4400 in the global namespace list, so that they can be processed
4401 later and all their interfaces resolved. */
4402 gfc_current_ns->code = s.head;
4405 for (; next->sibling; next = next->sibling)
4407 next->sibling = gfc_current_ns;
4410 gfc_global_ns_list = gfc_current_ns;
4412 next = gfc_current_ns;
4419 if (!gfc_option.flag_whole_file)
4422 /* Do the resolution. */
4423 resolve_all_program_units (gfc_global_ns_list);
4425 /* Do the parse tree dump. */
4427 = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
4429 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4431 gfc_dump_parse_tree (gfc_current_ns, stdout);
4432 fputs ("------------------------------------------\n\n", stdout);
4435 /* Do the translation. */
4436 translate_all_program_units (gfc_global_ns_list);
4440 gfc_end_source_files ();
4444 /* If we see a duplicate main program, shut down. If the second
4445 instance is an implied main program, i.e. data decls or executable
4446 statements, we're in for lots of errors. */
4447 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4448 reject_statement ();