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);
145 match ("data", gfc_match_data, ST_DATA);
146 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
150 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
151 match ("entry% ", gfc_match_entry, ST_ENTRY);
152 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
153 match ("external", gfc_match_external, ST_ATTR_DECL);
157 match ("format", gfc_match_format, ST_FORMAT);
164 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
165 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
166 match ("interface", gfc_match_interface, ST_INTERFACE);
167 match ("intent", gfc_match_intent, ST_ATTR_DECL);
168 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
175 match ("namelist", gfc_match_namelist, ST_NAMELIST);
179 match ("optional", gfc_match_optional, ST_ATTR_DECL);
183 match ("parameter", gfc_match_parameter, ST_PARAMETER);
184 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
185 if (gfc_match_private (&st) == MATCH_YES)
187 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
188 if (gfc_match_public (&st) == MATCH_YES)
190 match ("protected", gfc_match_protected, ST_ATTR_DECL);
197 match ("save", gfc_match_save, ST_ATTR_DECL);
201 match ("target", gfc_match_target, ST_ATTR_DECL);
202 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
209 match ("value", gfc_match_value, ST_ATTR_DECL);
210 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
217 /* This is not a specification statement. See if any of the matchers
218 has stored an error message of some sort. */
222 gfc_buffer_error (0);
223 gfc_current_locus = old_locus;
225 return ST_GET_FCN_CHARACTERISTICS;
229 /* This is the primary 'decode_statement'. */
231 decode_statement (void)
242 gfc_clear_error (); /* Clear any pending errors. */
243 gfc_clear_warning (); /* Clear any pending warnings. */
245 gfc_matching_function = false;
247 if (gfc_match_eos () == MATCH_YES)
250 if (gfc_current_state () == COMP_FUNCTION
251 && gfc_current_block ()->result->ts.kind == -1)
252 return decode_specification_statement ();
254 old_locus = gfc_current_locus;
256 /* Try matching a data declaration or function declaration. The
257 input "REALFUNCTIONA(N)" can mean several things in different
258 contexts, so it (and its relatives) get special treatment. */
260 if (gfc_current_state () == COMP_NONE
261 || gfc_current_state () == COMP_INTERFACE
262 || gfc_current_state () == COMP_CONTAINS)
264 gfc_matching_function = true;
265 m = gfc_match_function_decl ();
268 else if (m == MATCH_ERROR)
272 gfc_current_locus = old_locus;
274 gfc_matching_function = false;
277 /* Match statements whose error messages are meant to be overwritten
278 by something better. */
280 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
281 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
282 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
284 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
285 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
287 /* Try to match a subroutine statement, which has the same optional
288 prefixes that functions can have. */
290 if (gfc_match_subroutine () == MATCH_YES)
291 return ST_SUBROUTINE;
293 gfc_current_locus = old_locus;
295 /* Check for the IF, DO, SELECT, WHERE, FORALL, CRITICAL, and BLOCK
296 statements, which might begin with a block label. The match functions for
297 these statements are unusual in that their keyword is not seen before
298 the matcher is called. */
300 if (gfc_match_if (&st) == MATCH_YES)
303 gfc_current_locus = old_locus;
305 if (gfc_match_where (&st) == MATCH_YES)
308 gfc_current_locus = old_locus;
310 if (gfc_match_forall (&st) == MATCH_YES)
313 gfc_current_locus = old_locus;
315 match (NULL, gfc_match_do, ST_DO);
316 match (NULL, gfc_match_block, ST_BLOCK);
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 ("cycle", gfc_match_cycle, ST_CYCLE);
349 match ("case", gfc_match_case, ST_CASE);
350 match ("common", gfc_match_common, ST_COMMON);
351 match ("contains", gfc_match_eos, ST_CONTAINS);
352 match ("class", gfc_match_class_is, ST_CLASS_IS);
353 match ("codimension", gfc_match_codimension, ST_ATTR_DECL);
357 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
358 match ("data", gfc_match_data, ST_DATA);
359 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
363 match ("end file", gfc_match_endfile, ST_END_FILE);
364 match ("exit", gfc_match_exit, ST_EXIT);
365 match ("else", gfc_match_else, ST_ELSE);
366 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
367 match ("else if", gfc_match_elseif, ST_ELSEIF);
368 match ("error stop", gfc_match_error_stop, ST_ERROR_STOP);
369 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
371 if (gfc_match_end (&st) == MATCH_YES)
374 match ("entry% ", gfc_match_entry, ST_ENTRY);
375 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
376 match ("external", gfc_match_external, ST_ATTR_DECL);
380 match ("final", gfc_match_final_decl, ST_FINAL);
381 match ("flush", gfc_match_flush, ST_FLUSH);
382 match ("format", gfc_match_format, ST_FORMAT);
386 match ("generic", gfc_match_generic, ST_GENERIC);
387 match ("go to", gfc_match_goto, ST_GOTO);
391 match ("inquire", gfc_match_inquire, ST_INQUIRE);
392 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
393 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
394 match ("import", gfc_match_import, ST_IMPORT);
395 match ("interface", gfc_match_interface, ST_INTERFACE);
396 match ("intent", gfc_match_intent, ST_ATTR_DECL);
397 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
401 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
402 match ("module", gfc_match_module, ST_MODULE);
406 match ("nullify", gfc_match_nullify, ST_NULLIFY);
407 match ("namelist", gfc_match_namelist, ST_NAMELIST);
411 match ("open", gfc_match_open, ST_OPEN);
412 match ("optional", gfc_match_optional, ST_ATTR_DECL);
416 match ("print", gfc_match_print, ST_WRITE);
417 match ("parameter", gfc_match_parameter, ST_PARAMETER);
418 match ("pause", gfc_match_pause, ST_PAUSE);
419 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
420 if (gfc_match_private (&st) == MATCH_YES)
422 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
423 match ("program", gfc_match_program, ST_PROGRAM);
424 if (gfc_match_public (&st) == MATCH_YES)
426 match ("protected", gfc_match_protected, ST_ATTR_DECL);
430 match ("read", gfc_match_read, ST_READ);
431 match ("return", gfc_match_return, ST_RETURN);
432 match ("rewind", gfc_match_rewind, ST_REWIND);
436 match ("sequence", gfc_match_eos, ST_SEQUENCE);
437 match ("stop", gfc_match_stop, ST_STOP);
438 match ("save", gfc_match_save, ST_ATTR_DECL);
439 match ("sync all", gfc_match_sync_all, ST_SYNC_ALL);
440 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
441 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
445 match ("target", gfc_match_target, ST_ATTR_DECL);
446 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
447 match ("type is", gfc_match_type_is, ST_TYPE_IS);
451 match ("use", gfc_match_use, ST_USE);
455 match ("value", gfc_match_value, ST_ATTR_DECL);
456 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
460 match ("wait", gfc_match_wait, ST_WAIT);
461 match ("write", gfc_match_write, ST_WRITE);
465 /* All else has failed, so give up. See if any of the matchers has
466 stored an error message of some sort. */
468 if (gfc_error_check () == 0)
469 gfc_error_now ("Unclassifiable statement at %C");
473 gfc_error_recovery ();
479 decode_omp_directive (void)
488 gfc_clear_error (); /* Clear any pending errors. */
489 gfc_clear_warning (); /* Clear any pending warnings. */
493 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
494 "or ELEMENTAL procedures");
495 gfc_error_recovery ();
499 old_locus = gfc_current_locus;
501 /* General OpenMP directive matching: Instead of testing every possible
502 statement, we eliminate most possibilities by peeking at the
505 c = gfc_peek_ascii_char ();
510 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
513 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
516 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
519 match ("do", gfc_match_omp_do, ST_OMP_DO);
522 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
523 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
524 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
525 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
526 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
527 match ("end parallel sections", gfc_match_omp_eos,
528 ST_OMP_END_PARALLEL_SECTIONS);
529 match ("end parallel workshare", gfc_match_omp_eos,
530 ST_OMP_END_PARALLEL_WORKSHARE);
531 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
532 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
533 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
534 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
535 match ("end workshare", gfc_match_omp_end_nowait,
536 ST_OMP_END_WORKSHARE);
539 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
542 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
545 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
548 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
549 match ("parallel sections", gfc_match_omp_parallel_sections,
550 ST_OMP_PARALLEL_SECTIONS);
551 match ("parallel workshare", gfc_match_omp_parallel_workshare,
552 ST_OMP_PARALLEL_WORKSHARE);
553 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
556 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
557 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
558 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
561 match ("task", gfc_match_omp_task, ST_OMP_TASK);
562 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
563 match ("threadprivate", gfc_match_omp_threadprivate,
564 ST_OMP_THREADPRIVATE);
566 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
570 /* All else has failed, so give up. See if any of the matchers has
571 stored an error message of some sort. */
573 if (gfc_error_check () == 0)
574 gfc_error_now ("Unclassifiable OpenMP directive at %C");
578 gfc_error_recovery ();
584 decode_gcc_attribute (void)
592 gfc_clear_error (); /* Clear any pending errors. */
593 gfc_clear_warning (); /* Clear any pending warnings. */
594 old_locus = gfc_current_locus;
596 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
598 /* All else has failed, so give up. See if any of the matchers has
599 stored an error message of some sort. */
601 if (gfc_error_check () == 0)
602 gfc_error_now ("Unclassifiable GCC directive at %C");
606 gfc_error_recovery ();
614 /* Get the next statement in free form source. */
623 at_bol = gfc_at_bol ();
624 gfc_gobble_whitespace ();
626 c = gfc_peek_ascii_char ();
632 /* Found a statement label? */
633 m = gfc_match_st_label (&gfc_statement_label);
635 d = gfc_peek_ascii_char ();
636 if (m != MATCH_YES || !gfc_is_whitespace (d))
638 gfc_match_small_literal_int (&i, &cnt);
641 gfc_error_now ("Too many digits in statement label at %C");
644 gfc_error_now ("Zero is not a valid statement label at %C");
647 c = gfc_next_ascii_char ();
650 if (!gfc_is_whitespace (c))
651 gfc_error_now ("Non-numeric character in statement label at %C");
657 label_locus = gfc_current_locus;
659 gfc_gobble_whitespace ();
661 if (at_bol && gfc_peek_ascii_char () == ';')
663 gfc_error_now ("Semicolon at %C needs to be preceded by "
665 gfc_next_ascii_char (); /* Eat up the semicolon. */
669 if (gfc_match_eos () == MATCH_YES)
671 gfc_warning_now ("Ignoring statement label in empty statement "
672 "at %L", &label_locus);
673 gfc_free_st_label (gfc_statement_label);
674 gfc_statement_label = NULL;
681 /* Comments have already been skipped by the time we get here,
682 except for GCC attributes and OpenMP directives. */
684 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
685 c = gfc_peek_ascii_char ();
691 c = gfc_next_ascii_char ();
692 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
693 gcc_assert (c == "gcc$"[i]);
695 gfc_gobble_whitespace ();
696 return decode_gcc_attribute ();
699 else if (c == '$' && gfc_option.flag_openmp)
703 c = gfc_next_ascii_char ();
704 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
705 gcc_assert (c == "$omp"[i]);
707 gcc_assert (c == ' ' || c == '\t');
708 gfc_gobble_whitespace ();
709 return decode_omp_directive ();
715 if (at_bol && c == ';')
717 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
718 gfc_next_ascii_char (); /* Eat up the semicolon. */
722 return decode_statement ();
726 /* Get the next statement in fixed-form source. */
731 int label, digit_flag, i;
736 return decode_statement ();
738 /* Skip past the current label field, parsing a statement label if
739 one is there. This is a weird number parser, since the number is
740 contained within five columns and can have any kind of embedded
741 spaces. We also check for characters that make the rest of the
747 for (i = 0; i < 5; i++)
749 c = gfc_next_char_literal (0);
766 label = label * 10 + ((unsigned char) c - '0');
767 label_locus = gfc_current_locus;
771 /* Comments have already been skipped by the time we get
772 here, except for GCC attributes and OpenMP directives. */
775 c = gfc_next_char_literal (0);
777 if (TOLOWER (c) == 'g')
779 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
780 gcc_assert (TOLOWER (c) == "gcc$"[i]);
782 return decode_gcc_attribute ();
784 else if (c == '$' && gfc_option.flag_openmp)
786 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
787 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
789 if (c != ' ' && c != '0')
791 gfc_buffer_error (0);
792 gfc_error ("Bad continuation line at %C");
796 return decode_omp_directive ();
800 /* Comments have already been skipped by the time we get
801 here so don't bother checking for them. */
804 gfc_buffer_error (0);
805 gfc_error ("Non-numeric character in statement label at %C");
813 gfc_warning_now ("Zero is not a valid statement label at %C");
816 /* We've found a valid statement label. */
817 gfc_statement_label = gfc_get_st_label (label);
821 /* Since this line starts a statement, it cannot be a continuation
822 of a previous statement. If we see something here besides a
823 space or zero, it must be a bad continuation line. */
825 c = gfc_next_char_literal (0);
829 if (c != ' ' && c != '0')
831 gfc_buffer_error (0);
832 gfc_error ("Bad continuation line at %C");
836 /* Now that we've taken care of the statement label columns, we have
837 to make sure that the first nonblank character is not a '!'. If
838 it is, the rest of the line is a comment. */
842 loc = gfc_current_locus;
843 c = gfc_next_char_literal (0);
845 while (gfc_is_whitespace (c));
849 gfc_current_locus = loc;
853 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
857 if (gfc_match_eos () == MATCH_YES)
860 /* At this point, we've got a nonblank statement to parse. */
861 return decode_statement ();
865 gfc_warning_now ("Ignoring statement label in empty statement at %L",
868 gfc_current_locus.lb->truncated = 0;
874 /* Return the next non-ST_NONE statement to the caller. We also worry
875 about including files and the ends of include files at this stage. */
878 next_statement (void)
883 gfc_new_block = NULL;
885 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
888 gfc_statement_label = NULL;
889 gfc_buffer_error (1);
894 gfc_skip_comments ();
902 if (gfc_define_undef_line ())
905 old_locus = gfc_current_locus;
907 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
913 gfc_buffer_error (0);
915 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
917 gfc_free_st_label (gfc_statement_label);
918 gfc_statement_label = NULL;
919 gfc_current_locus = old_locus;
923 check_statement_label (st);
929 /****************************** Parser ***********************************/
931 /* The parser subroutines are of type 'try' that fail if the file ends
934 /* Macros that expand to case-labels for various classes of
935 statements. Start with executable statements that directly do
938 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
939 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
940 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
941 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
942 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
943 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
944 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
945 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
946 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT: case ST_ERROR_STOP: \
947 case ST_SYNC_ALL: case ST_SYNC_IMAGES: case ST_SYNC_MEMORY
949 /* Statements that mark other executable statements. */
951 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: \
952 case ST_IF_BLOCK: case ST_BLOCK: \
953 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_SELECT_TYPE: \
954 case ST_OMP_PARALLEL: \
955 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
956 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
957 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
958 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
959 case ST_OMP_TASK: case ST_CRITICAL
961 /* Declaration statements */
963 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
964 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
965 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
968 /* Block end statements. Errors associated with interchanging these
969 are detected in gfc_match_end(). */
971 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
972 case ST_END_PROGRAM: case ST_END_SUBROUTINE: \
976 /* Push a new state onto the stack. */
979 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
981 p->state = new_state;
982 p->previous = gfc_state_stack;
984 p->head = p->tail = NULL;
985 p->do_variable = NULL;
990 /* Pop the current state. */
994 gfc_state_stack = gfc_state_stack->previous;
998 /* Try to find the given state in the state stack. */
1001 gfc_find_state (gfc_compile_state state)
1005 for (p = gfc_state_stack; p; p = p->previous)
1006 if (p->state == state)
1009 return (p == NULL) ? FAILURE : SUCCESS;
1013 /* Starts a new level in the statement list. */
1016 new_level (gfc_code *q)
1020 p = q->block = gfc_get_code ();
1022 gfc_state_stack->head = gfc_state_stack->tail = p;
1028 /* Add the current new_st code structure and adds it to the current
1029 program unit. As a side-effect, it zeroes the new_st. */
1032 add_statement (void)
1036 p = gfc_get_code ();
1039 p->loc = gfc_current_locus;
1041 if (gfc_state_stack->head == NULL)
1042 gfc_state_stack->head = p;
1044 gfc_state_stack->tail->next = p;
1046 while (p->next != NULL)
1049 gfc_state_stack->tail = p;
1051 gfc_clear_new_st ();
1057 /* Frees everything associated with the current statement. */
1060 undo_new_statement (void)
1062 gfc_free_statements (new_st.block);
1063 gfc_free_statements (new_st.next);
1064 gfc_free_statement (&new_st);
1065 gfc_clear_new_st ();
1069 /* If the current statement has a statement label, make sure that it
1070 is allowed to, or should have one. */
1073 check_statement_label (gfc_statement st)
1077 if (gfc_statement_label == NULL)
1079 if (st == ST_FORMAT)
1080 gfc_error ("FORMAT statement at %L does not have a statement label",
1087 case ST_END_PROGRAM:
1088 case ST_END_FUNCTION:
1089 case ST_END_SUBROUTINE:
1093 case ST_END_CRITICAL:
1096 type = ST_LABEL_TARGET;
1100 type = ST_LABEL_FORMAT;
1103 /* Statement labels are not restricted from appearing on a
1104 particular line. However, there are plenty of situations
1105 where the resulting label can't be referenced. */
1108 type = ST_LABEL_BAD_TARGET;
1112 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1114 new_st.here = gfc_statement_label;
1118 /* Figures out what the enclosing program unit is. This will be a
1119 function, subroutine, program, block data or module. */
1122 gfc_enclosing_unit (gfc_compile_state * result)
1126 for (p = gfc_state_stack; p; p = p->previous)
1127 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1128 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1129 || p->state == COMP_PROGRAM)
1138 *result = COMP_PROGRAM;
1143 /* Translate a statement enum to a string. */
1146 gfc_ascii_statement (gfc_statement st)
1152 case ST_ARITHMETIC_IF:
1153 p = _("arithmetic IF");
1159 p = _("attribute declaration");
1195 p = _("data declaration");
1203 case ST_DERIVED_DECL:
1204 p = _("derived type declaration");
1221 case ST_END_BLOCK_DATA:
1222 p = "END BLOCK DATA";
1224 case ST_END_CRITICAL:
1236 case ST_END_FUNCTION:
1242 case ST_END_INTERFACE:
1243 p = "END INTERFACE";
1248 case ST_END_PROGRAM:
1254 case ST_END_SUBROUTINE:
1255 p = "END SUBROUTINE";
1266 case ST_EQUIVALENCE:
1278 case ST_FORALL_BLOCK: /* Fall through */
1300 case ST_IMPLICIT_NONE:
1301 p = "IMPLICIT NONE";
1303 case ST_IMPLIED_ENDDO:
1304 p = _("implied END DO");
1330 case ST_MODULE_PROC:
1331 p = "MODULE PROCEDURE";
1363 case ST_SYNC_IMAGES:
1366 case ST_SYNC_MEMORY:
1378 case ST_WHERE_BLOCK: /* Fall through */
1389 p = _("assignment");
1391 case ST_POINTER_ASSIGNMENT:
1392 p = _("pointer assignment");
1394 case ST_SELECT_CASE:
1397 case ST_SELECT_TYPE:
1412 case ST_STATEMENT_FUNCTION:
1413 p = "STATEMENT FUNCTION";
1415 case ST_LABEL_ASSIGNMENT:
1416 p = "LABEL ASSIGNMENT";
1419 p = "ENUM DEFINITION";
1422 p = "ENUMERATOR DEFINITION";
1430 case ST_OMP_BARRIER:
1431 p = "!$OMP BARRIER";
1433 case ST_OMP_CRITICAL:
1434 p = "!$OMP CRITICAL";
1439 case ST_OMP_END_CRITICAL:
1440 p = "!$OMP END CRITICAL";
1445 case ST_OMP_END_MASTER:
1446 p = "!$OMP END MASTER";
1448 case ST_OMP_END_ORDERED:
1449 p = "!$OMP END ORDERED";
1451 case ST_OMP_END_PARALLEL:
1452 p = "!$OMP END PARALLEL";
1454 case ST_OMP_END_PARALLEL_DO:
1455 p = "!$OMP END PARALLEL DO";
1457 case ST_OMP_END_PARALLEL_SECTIONS:
1458 p = "!$OMP END PARALLEL SECTIONS";
1460 case ST_OMP_END_PARALLEL_WORKSHARE:
1461 p = "!$OMP END PARALLEL WORKSHARE";
1463 case ST_OMP_END_SECTIONS:
1464 p = "!$OMP END SECTIONS";
1466 case ST_OMP_END_SINGLE:
1467 p = "!$OMP END SINGLE";
1469 case ST_OMP_END_TASK:
1470 p = "!$OMP END TASK";
1472 case ST_OMP_END_WORKSHARE:
1473 p = "!$OMP END WORKSHARE";
1481 case ST_OMP_ORDERED:
1482 p = "!$OMP ORDERED";
1484 case ST_OMP_PARALLEL:
1485 p = "!$OMP PARALLEL";
1487 case ST_OMP_PARALLEL_DO:
1488 p = "!$OMP PARALLEL DO";
1490 case ST_OMP_PARALLEL_SECTIONS:
1491 p = "!$OMP PARALLEL SECTIONS";
1493 case ST_OMP_PARALLEL_WORKSHARE:
1494 p = "!$OMP PARALLEL WORKSHARE";
1496 case ST_OMP_SECTIONS:
1497 p = "!$OMP SECTIONS";
1499 case ST_OMP_SECTION:
1500 p = "!$OMP SECTION";
1508 case ST_OMP_TASKWAIT:
1509 p = "!$OMP TASKWAIT";
1511 case ST_OMP_THREADPRIVATE:
1512 p = "!$OMP THREADPRIVATE";
1514 case ST_OMP_WORKSHARE:
1515 p = "!$OMP WORKSHARE";
1518 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1525 /* Create a symbol for the main program and assign it to ns->proc_name. */
1528 main_program_symbol (gfc_namespace *ns, const char *name)
1530 gfc_symbol *main_program;
1531 symbol_attribute attr;
1533 gfc_get_symbol (name, ns, &main_program);
1534 gfc_clear_attr (&attr);
1535 attr.flavor = FL_PROGRAM;
1536 attr.proc = PROC_UNKNOWN;
1537 attr.subroutine = 1;
1538 attr.access = ACCESS_PUBLIC;
1539 attr.is_main_program = 1;
1540 main_program->attr = attr;
1541 main_program->declared_at = gfc_current_locus;
1542 ns->proc_name = main_program;
1543 gfc_commit_symbols ();
1547 /* Do whatever is necessary to accept the last statement. */
1550 accept_statement (gfc_statement st)
1558 case ST_IMPLICIT_NONE:
1559 gfc_set_implicit_none ();
1568 gfc_current_ns->proc_name = gfc_new_block;
1571 /* If the statement is the end of a block, lay down a special code
1572 that allows a branch to the end of the block from within the
1573 construct. IF and SELECT are treated differently from DO
1574 (where EXEC_NOP is added inside the loop) for two
1576 1. END DO has a meaning in the sense that after a GOTO to
1577 it, the loop counter must be increased.
1578 2. IF blocks and SELECT blocks can consist of multiple
1579 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1580 Putting the label before the END IF would make the jump
1581 from, say, the ELSE IF block to the END IF illegal. */
1585 case ST_END_CRITICAL:
1586 if (gfc_statement_label != NULL)
1588 new_st.op = EXEC_END_BLOCK;
1593 /* The end-of-program unit statements do not get the special
1594 marker and require a statement of some sort if they are a
1597 case ST_END_PROGRAM:
1598 case ST_END_FUNCTION:
1599 case ST_END_SUBROUTINE:
1600 if (gfc_statement_label != NULL)
1602 new_st.op = EXEC_RETURN;
1607 new_st.op = EXEC_END_PROCEDURE;
1623 gfc_commit_symbols ();
1624 gfc_warning_check ();
1625 gfc_clear_new_st ();
1629 /* Undo anything tentative that has been built for the current
1633 reject_statement (void)
1635 /* Revert to the previous charlen chain. */
1636 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1637 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1639 gfc_new_block = NULL;
1640 gfc_undo_symbols ();
1641 gfc_clear_warning ();
1642 undo_new_statement ();
1646 /* Generic complaint about an out of order statement. We also do
1647 whatever is necessary to clean up. */
1650 unexpected_statement (gfc_statement st)
1652 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1654 reject_statement ();
1658 /* Given the next statement seen by the matcher, make sure that it is
1659 in proper order with the last. This subroutine is initialized by
1660 calling it with an argument of ST_NONE. If there is a problem, we
1661 issue an error and return FAILURE. Otherwise we return SUCCESS.
1663 Individual parsers need to verify that the statements seen are
1664 valid before calling here, i.e., ENTRY statements are not allowed in
1665 INTERFACE blocks. The following diagram is taken from the standard:
1667 +---------------------------------------+
1668 | program subroutine function module |
1669 +---------------------------------------+
1671 +---------------------------------------+
1673 +---------------------------------------+
1675 | +-----------+------------------+
1676 | | parameter | implicit |
1677 | +-----------+------------------+
1678 | format | | derived type |
1679 | entry | parameter | interface |
1680 | | data | specification |
1681 | | | statement func |
1682 | +-----------+------------------+
1683 | | data | executable |
1684 +--------+-----------+------------------+
1686 +---------------------------------------+
1687 | internal module/subprogram |
1688 +---------------------------------------+
1690 +---------------------------------------+
1699 ORDER_IMPLICIT_NONE,
1707 enum state_order state;
1708 gfc_statement last_statement;
1714 verify_st_order (st_state *p, gfc_statement st, bool silent)
1720 p->state = ORDER_START;
1724 if (p->state > ORDER_USE)
1726 p->state = ORDER_USE;
1730 if (p->state > ORDER_IMPORT)
1732 p->state = ORDER_IMPORT;
1735 case ST_IMPLICIT_NONE:
1736 if (p->state > ORDER_IMPLICIT_NONE)
1739 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1740 statement disqualifies a USE but not an IMPLICIT NONE.
1741 Duplicate IMPLICIT NONEs are caught when the implicit types
1744 p->state = ORDER_IMPLICIT_NONE;
1748 if (p->state > ORDER_IMPLICIT)
1750 p->state = ORDER_IMPLICIT;
1755 if (p->state < ORDER_IMPLICIT_NONE)
1756 p->state = ORDER_IMPLICIT_NONE;
1760 if (p->state >= ORDER_EXEC)
1762 if (p->state < ORDER_IMPLICIT)
1763 p->state = ORDER_IMPLICIT;
1767 if (p->state < ORDER_SPEC)
1768 p->state = ORDER_SPEC;
1773 case ST_DERIVED_DECL:
1775 if (p->state >= ORDER_EXEC)
1777 if (p->state < ORDER_SPEC)
1778 p->state = ORDER_SPEC;
1783 if (p->state < ORDER_EXEC)
1784 p->state = ORDER_EXEC;
1788 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1789 gfc_ascii_statement (st));
1792 /* All is well, record the statement in case we need it next time. */
1793 p->where = gfc_current_locus;
1794 p->last_statement = st;
1799 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1800 gfc_ascii_statement (st),
1801 gfc_ascii_statement (p->last_statement), &p->where);
1807 /* Handle an unexpected end of file. This is a show-stopper... */
1809 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1812 unexpected_eof (void)
1816 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1818 /* Memory cleanup. Move to "second to last". */
1819 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1822 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1825 longjmp (eof_buf, 1);
1829 /* Parse the CONTAINS section of a derived type definition. */
1831 gfc_access gfc_typebound_default_access;
1834 parse_derived_contains (void)
1837 bool seen_private = false;
1838 bool seen_comps = false;
1839 bool error_flag = false;
1842 gcc_assert (gfc_current_state () == COMP_DERIVED);
1843 gcc_assert (gfc_current_block ());
1845 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1847 if (gfc_current_block ()->attr.sequence)
1848 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1849 " section at %C", gfc_current_block ()->name);
1850 if (gfc_current_block ()->attr.is_bind_c)
1851 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1852 " section at %C", gfc_current_block ()->name);
1854 accept_statement (ST_CONTAINS);
1855 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1857 gfc_typebound_default_access = ACCESS_PUBLIC;
1863 st = next_statement ();
1871 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1876 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1877 " procedure at %C") == FAILURE)
1880 accept_statement (ST_PROCEDURE);
1885 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1886 " at %C") == FAILURE)
1889 accept_statement (ST_GENERIC);
1894 if (gfc_notify_std (GFC_STD_F2003,
1895 "Fortran 2003: FINAL procedure declaration"
1896 " at %C") == FAILURE)
1899 accept_statement (ST_FINAL);
1907 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1908 "definition at %C with empty CONTAINS "
1909 "section") == FAILURE))
1912 /* ST_END_TYPE is accepted by parse_derived after return. */
1916 if (gfc_find_state (COMP_MODULE) == FAILURE)
1918 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1926 gfc_error ("PRIVATE statement at %C must precede procedure"
1934 gfc_error ("Duplicate PRIVATE statement at %C");
1938 accept_statement (ST_PRIVATE);
1939 gfc_typebound_default_access = ACCESS_PRIVATE;
1940 seen_private = true;
1944 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1949 gfc_error ("Already inside a CONTAINS block at %C");
1954 unexpected_statement (st);
1960 gcc_assert (gfc_current_state () == COMP_DERIVED);
1966 /* Parse a derived type. */
1969 parse_derived (void)
1971 int compiling_type, seen_private, seen_sequence, seen_component;
1977 accept_statement (ST_DERIVED_DECL);
1978 push_state (&s, COMP_DERIVED, gfc_new_block);
1980 gfc_new_block->component_access = ACCESS_PUBLIC;
1987 while (compiling_type)
1989 st = next_statement ();
1997 accept_statement (st);
2002 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
2009 if (!seen_component)
2010 gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
2011 "definition at %C without components");
2013 accept_statement (ST_END_TYPE);
2017 if (gfc_find_state (COMP_MODULE) == FAILURE)
2019 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
2026 gfc_error ("PRIVATE statement at %C must precede "
2027 "structure components");
2032 gfc_error ("Duplicate PRIVATE statement at %C");
2034 s.sym->component_access = ACCESS_PRIVATE;
2036 accept_statement (ST_PRIVATE);
2043 gfc_error ("SEQUENCE statement at %C must precede "
2044 "structure components");
2048 if (gfc_current_block ()->attr.sequence)
2049 gfc_warning ("SEQUENCE attribute at %C already specified in "
2054 gfc_error ("Duplicate SEQUENCE statement at %C");
2058 gfc_add_sequence (&gfc_current_block ()->attr,
2059 gfc_current_block ()->name, NULL);
2063 gfc_notify_std (GFC_STD_F2003,
2064 "Fortran 2003: CONTAINS block in derived type"
2065 " definition at %C");
2067 accept_statement (ST_CONTAINS);
2068 parse_derived_contains ();
2072 unexpected_statement (st);
2077 /* need to verify that all fields of the derived type are
2078 * interoperable with C if the type is declared to be bind(c)
2080 sym = gfc_current_block ();
2081 for (c = sym->components; c; c = c->next)
2083 /* Look for allocatable components. */
2084 if (c->attr.allocatable
2085 || (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.allocatable)
2086 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2087 sym->attr.alloc_comp = 1;
2089 /* Look for pointer components. */
2091 || (c->ts.type == BT_CLASS && CLASS_DATA (c)->attr.pointer)
2092 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2093 sym->attr.pointer_comp = 1;
2095 /* Look for procedure pointer components. */
2096 if (c->attr.proc_pointer
2097 || (c->ts.type == BT_DERIVED
2098 && c->ts.u.derived->attr.proc_pointer_comp))
2099 sym->attr.proc_pointer_comp = 1;
2101 /* Looking for coarray components. */
2102 if (c->attr.codimension
2103 || (c->attr.coarray_comp && !c->attr.pointer && !c->attr.allocatable))
2104 sym->attr.coarray_comp = 1;
2106 /* Look for private components. */
2107 if (sym->component_access == ACCESS_PRIVATE
2108 || c->attr.access == ACCESS_PRIVATE
2109 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2110 sym->attr.private_comp = 1;
2113 if (!seen_component)
2114 sym->attr.zero_comp = 1;
2120 /* Parse an ENUM. */
2128 int seen_enumerator = 0;
2130 push_state (&s, COMP_ENUM, gfc_new_block);
2134 while (compiling_enum)
2136 st = next_statement ();
2144 seen_enumerator = 1;
2145 accept_statement (st);
2150 if (!seen_enumerator)
2151 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2152 accept_statement (st);
2156 gfc_free_enum_history ();
2157 unexpected_statement (st);
2165 /* Parse an interface. We must be able to deal with the possibility
2166 of recursive interfaces. The parse_spec() subroutine is mutually
2167 recursive with parse_interface(). */
2169 static gfc_statement parse_spec (gfc_statement);
2172 parse_interface (void)
2174 gfc_compile_state new_state = COMP_NONE, current_state;
2175 gfc_symbol *prog_unit, *sym;
2176 gfc_interface_info save;
2177 gfc_state_data s1, s2;
2181 accept_statement (ST_INTERFACE);
2183 current_interface.ns = gfc_current_ns;
2184 save = current_interface;
2186 sym = (current_interface.type == INTERFACE_GENERIC
2187 || current_interface.type == INTERFACE_USER_OP)
2188 ? gfc_new_block : NULL;
2190 push_state (&s1, COMP_INTERFACE, sym);
2191 current_state = COMP_NONE;
2194 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2196 st = next_statement ();
2204 if (st == ST_SUBROUTINE)
2205 new_state = COMP_SUBROUTINE;
2206 else if (st == ST_FUNCTION)
2207 new_state = COMP_FUNCTION;
2208 if (gfc_new_block->attr.pointer)
2210 gfc_new_block->attr.pointer = 0;
2211 gfc_new_block->attr.proc_pointer = 1;
2213 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2214 gfc_new_block->formal, NULL) == FAILURE)
2216 reject_statement ();
2217 gfc_free_namespace (gfc_current_ns);
2223 case ST_MODULE_PROC: /* The module procedure matcher makes
2224 sure the context is correct. */
2225 accept_statement (st);
2226 gfc_free_namespace (gfc_current_ns);
2229 case ST_END_INTERFACE:
2230 gfc_free_namespace (gfc_current_ns);
2231 gfc_current_ns = current_interface.ns;
2235 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2236 gfc_ascii_statement (st));
2237 reject_statement ();
2238 gfc_free_namespace (gfc_current_ns);
2243 /* Make sure that a generic interface has only subroutines or
2244 functions and that the generic name has the right attribute. */
2245 if (current_interface.type == INTERFACE_GENERIC)
2247 if (current_state == COMP_NONE)
2249 if (new_state == COMP_FUNCTION && sym)
2250 gfc_add_function (&sym->attr, sym->name, NULL);
2251 else if (new_state == COMP_SUBROUTINE && sym)
2252 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2254 current_state = new_state;
2258 if (new_state != current_state)
2260 if (new_state == COMP_SUBROUTINE)
2261 gfc_error ("SUBROUTINE at %C does not belong in a "
2262 "generic function interface");
2264 if (new_state == COMP_FUNCTION)
2265 gfc_error ("FUNCTION at %C does not belong in a "
2266 "generic subroutine interface");
2271 if (current_interface.type == INTERFACE_ABSTRACT)
2273 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2274 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2275 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2276 "cannot be the same as an intrinsic type",
2277 gfc_new_block->name);
2280 push_state (&s2, new_state, gfc_new_block);
2281 accept_statement (st);
2282 prog_unit = gfc_new_block;
2283 prog_unit->formal_ns = gfc_current_ns;
2284 proc_locus = gfc_current_locus;
2287 /* Read data declaration statements. */
2288 st = parse_spec (ST_NONE);
2290 /* Since the interface block does not permit an IMPLICIT statement,
2291 the default type for the function or the result must be taken
2292 from the formal namespace. */
2293 if (new_state == COMP_FUNCTION)
2295 if (prog_unit->result == prog_unit
2296 && prog_unit->ts.type == BT_UNKNOWN)
2297 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2298 else if (prog_unit->result != prog_unit
2299 && prog_unit->result->ts.type == BT_UNKNOWN)
2300 gfc_set_default_type (prog_unit->result, 1,
2301 prog_unit->formal_ns);
2304 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2306 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2307 gfc_ascii_statement (st));
2308 reject_statement ();
2312 /* Add EXTERNAL attribute to function or subroutine. */
2313 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2314 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2316 current_interface = save;
2317 gfc_add_interface (prog_unit);
2320 if (current_interface.ns
2321 && current_interface.ns->proc_name
2322 && strcmp (current_interface.ns->proc_name->name,
2323 prog_unit->name) == 0)
2324 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2325 "enclosing procedure", prog_unit->name, &proc_locus);
2334 /* Associate function characteristics by going back to the function
2335 declaration and rematching the prefix. */
2338 match_deferred_characteristics (gfc_typespec * ts)
2341 match m = MATCH_ERROR;
2342 char name[GFC_MAX_SYMBOL_LEN + 1];
2344 loc = gfc_current_locus;
2346 gfc_current_locus = gfc_current_block ()->declared_at;
2349 gfc_buffer_error (1);
2350 m = gfc_match_prefix (ts);
2351 gfc_buffer_error (0);
2353 if (ts->type == BT_DERIVED)
2361 /* Only permit one go at the characteristic association. */
2365 /* Set the function locus correctly. If we have not found the
2366 function name, there is an error. */
2368 && gfc_match ("function% %n", name) == MATCH_YES
2369 && strcmp (name, gfc_current_block ()->name) == 0)
2371 gfc_current_block ()->declared_at = gfc_current_locus;
2372 gfc_commit_symbols ();
2377 gfc_current_locus =loc;
2382 /* Check specification-expressions in the function result of the currently
2383 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2384 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2385 scope are not yet parsed so this has to be delayed up to parse_spec. */
2388 check_function_result_typed (void)
2390 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2392 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2393 gcc_assert (ts->type != BT_UNKNOWN);
2395 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2396 /* TODO: Extend when KIND type parameters are implemented. */
2397 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2398 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2402 /* Parse a set of specification statements. Returns the statement
2403 that doesn't fit. */
2405 static gfc_statement
2406 parse_spec (gfc_statement st)
2409 bool function_result_typed = false;
2410 bool bad_characteristic = false;
2413 verify_st_order (&ss, ST_NONE, false);
2415 st = next_statement ();
2417 /* If we are not inside a function or don't have a result specified so far,
2418 do nothing special about it. */
2419 if (gfc_current_state () != COMP_FUNCTION)
2420 function_result_typed = true;
2423 gfc_symbol* proc = gfc_current_ns->proc_name;
2426 if (proc->result->ts.type == BT_UNKNOWN)
2427 function_result_typed = true;
2432 /* If we're inside a BLOCK construct, some statements are disallowed.
2433 Check this here. Attribute declaration statements like INTENT, OPTIONAL
2434 or VALUE are also disallowed, but they don't have a particular ST_*
2435 key so we have to check for them individually in their matcher routine. */
2436 if (gfc_current_state () == COMP_BLOCK)
2440 case ST_IMPLICIT_NONE:
2443 case ST_EQUIVALENCE:
2444 case ST_STATEMENT_FUNCTION:
2445 gfc_error ("%s statement is not allowed inside of BLOCK at %C",
2446 gfc_ascii_statement (st));
2453 /* If we find a statement that can not be followed by an IMPLICIT statement
2454 (and thus we can expect to see none any further), type the function result
2455 if it has not yet been typed. Be careful not to give the END statement
2456 to verify_st_order! */
2457 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2459 bool verify_now = false;
2461 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2466 verify_st_order (&dummyss, ST_NONE, false);
2467 verify_st_order (&dummyss, st, false);
2469 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2475 check_function_result_typed ();
2476 function_result_typed = true;
2485 case ST_IMPLICIT_NONE:
2487 if (!function_result_typed)
2489 check_function_result_typed ();
2490 function_result_typed = true;
2496 case ST_DATA: /* Not allowed in interfaces */
2497 if (gfc_current_state () == COMP_INTERFACE)
2507 case ST_DERIVED_DECL:
2510 if (verify_st_order (&ss, st, false) == FAILURE)
2512 reject_statement ();
2513 st = next_statement ();
2523 case ST_DERIVED_DECL:
2529 if (gfc_current_state () != COMP_MODULE)
2531 gfc_error ("%s statement must appear in a MODULE",
2532 gfc_ascii_statement (st));
2536 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2538 gfc_error ("%s statement at %C follows another accessibility "
2539 "specification", gfc_ascii_statement (st));
2543 gfc_current_ns->default_access = (st == ST_PUBLIC)
2544 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2548 case ST_STATEMENT_FUNCTION:
2549 if (gfc_current_state () == COMP_MODULE)
2551 unexpected_statement (st);
2559 accept_statement (st);
2560 st = next_statement ();
2564 accept_statement (st);
2566 st = next_statement ();
2569 case ST_GET_FCN_CHARACTERISTICS:
2570 /* This statement triggers the association of a function's result
2572 ts = &gfc_current_block ()->result->ts;
2573 if (match_deferred_characteristics (ts) != MATCH_YES)
2574 bad_characteristic = true;
2576 st = next_statement ();
2583 /* If match_deferred_characteristics failed, then there is an error. */
2584 if (bad_characteristic)
2586 ts = &gfc_current_block ()->result->ts;
2587 if (ts->type != BT_DERIVED)
2588 gfc_error ("Bad kind expression for function '%s' at %L",
2589 gfc_current_block ()->name,
2590 &gfc_current_block ()->declared_at);
2592 gfc_error ("The type for function '%s' at %L is not accessible",
2593 gfc_current_block ()->name,
2594 &gfc_current_block ()->declared_at);
2596 gfc_current_block ()->ts.kind = 0;
2597 /* Keep the derived type; if it's bad, it will be discovered later. */
2598 if (!(ts->type == BT_DERIVED && ts->u.derived))
2599 ts->type = BT_UNKNOWN;
2606 /* Parse a WHERE block, (not a simple WHERE statement). */
2609 parse_where_block (void)
2611 int seen_empty_else;
2616 accept_statement (ST_WHERE_BLOCK);
2617 top = gfc_state_stack->tail;
2619 push_state (&s, COMP_WHERE, gfc_new_block);
2621 d = add_statement ();
2622 d->expr1 = top->expr1;
2628 seen_empty_else = 0;
2632 st = next_statement ();
2638 case ST_WHERE_BLOCK:
2639 parse_where_block ();
2644 accept_statement (st);
2648 if (seen_empty_else)
2650 gfc_error ("ELSEWHERE statement at %C follows previous "
2651 "unmasked ELSEWHERE");
2655 if (new_st.expr1 == NULL)
2656 seen_empty_else = 1;
2658 d = new_level (gfc_state_stack->head);
2660 d->expr1 = new_st.expr1;
2662 accept_statement (st);
2667 accept_statement (st);
2671 gfc_error ("Unexpected %s statement in WHERE block at %C",
2672 gfc_ascii_statement (st));
2673 reject_statement ();
2677 while (st != ST_END_WHERE);
2683 /* Parse a FORALL block (not a simple FORALL statement). */
2686 parse_forall_block (void)
2692 accept_statement (ST_FORALL_BLOCK);
2693 top = gfc_state_stack->tail;
2695 push_state (&s, COMP_FORALL, gfc_new_block);
2697 d = add_statement ();
2698 d->op = EXEC_FORALL;
2703 st = next_statement ();
2708 case ST_POINTER_ASSIGNMENT:
2711 accept_statement (st);
2714 case ST_WHERE_BLOCK:
2715 parse_where_block ();
2718 case ST_FORALL_BLOCK:
2719 parse_forall_block ();
2723 accept_statement (st);
2730 gfc_error ("Unexpected %s statement in FORALL block at %C",
2731 gfc_ascii_statement (st));
2733 reject_statement ();
2737 while (st != ST_END_FORALL);
2743 static gfc_statement parse_executable (gfc_statement);
2745 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2748 parse_if_block (void)
2757 accept_statement (ST_IF_BLOCK);
2759 top = gfc_state_stack->tail;
2760 push_state (&s, COMP_IF, gfc_new_block);
2762 new_st.op = EXEC_IF;
2763 d = add_statement ();
2765 d->expr1 = top->expr1;
2771 st = parse_executable (ST_NONE);
2781 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2782 "statement at %L", &else_locus);
2784 reject_statement ();
2788 d = new_level (gfc_state_stack->head);
2790 d->expr1 = new_st.expr1;
2792 accept_statement (st);
2799 gfc_error ("Duplicate ELSE statements at %L and %C",
2801 reject_statement ();
2806 else_locus = gfc_current_locus;
2808 d = new_level (gfc_state_stack->head);
2811 accept_statement (st);
2819 unexpected_statement (st);
2823 while (st != ST_ENDIF);
2826 accept_statement (st);
2830 /* Parse a SELECT block. */
2833 parse_select_block (void)
2839 accept_statement (ST_SELECT_CASE);
2841 cp = gfc_state_stack->tail;
2842 push_state (&s, COMP_SELECT, gfc_new_block);
2844 /* Make sure that the next statement is a CASE or END SELECT. */
2847 st = next_statement ();
2850 if (st == ST_END_SELECT)
2852 /* Empty SELECT CASE is OK. */
2853 accept_statement (st);
2860 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2863 reject_statement ();
2866 /* At this point, we're got a nonempty select block. */
2867 cp = new_level (cp);
2870 accept_statement (st);
2874 st = parse_executable (ST_NONE);
2881 cp = new_level (gfc_state_stack->head);
2883 gfc_clear_new_st ();
2885 accept_statement (st);
2891 /* Can't have an executable statement because of
2892 parse_executable(). */
2894 unexpected_statement (st);
2898 while (st != ST_END_SELECT);
2901 accept_statement (st);
2905 /* Pop the current selector from the SELECT TYPE stack. */
2908 select_type_pop (void)
2910 gfc_select_type_stack *old = select_type_stack;
2911 select_type_stack = old->prev;
2916 /* Parse a SELECT TYPE construct (F03:R821). */
2919 parse_select_type_block (void)
2925 accept_statement (ST_SELECT_TYPE);
2927 cp = gfc_state_stack->tail;
2928 push_state (&s, COMP_SELECT_TYPE, gfc_new_block);
2930 /* Make sure that the next statement is a TYPE IS, CLASS IS, CLASS DEFAULT
2934 st = next_statement ();
2937 if (st == ST_END_SELECT)
2938 /* Empty SELECT CASE is OK. */
2940 if (st == ST_TYPE_IS || st == ST_CLASS_IS)
2943 gfc_error ("Expected TYPE IS, CLASS IS or END SELECT statement "
2944 "following SELECT TYPE at %C");
2946 reject_statement ();
2949 /* At this point, we're got a nonempty select block. */
2950 cp = new_level (cp);
2953 accept_statement (st);
2957 st = parse_executable (ST_NONE);
2965 cp = new_level (gfc_state_stack->head);
2967 gfc_clear_new_st ();
2969 accept_statement (st);
2975 /* Can't have an executable statement because of
2976 parse_executable(). */
2978 unexpected_statement (st);
2982 while (st != ST_END_SELECT);
2986 accept_statement (st);
2987 gfc_current_ns = gfc_current_ns->parent;
2992 /* Given a symbol, make sure it is not an iteration variable for a DO
2993 statement. This subroutine is called when the symbol is seen in a
2994 context that causes it to become redefined. If the symbol is an
2995 iterator, we generate an error message and return nonzero. */
2998 gfc_check_do_variable (gfc_symtree *st)
3002 for (s=gfc_state_stack; s; s = s->previous)
3003 if (s->do_variable == st)
3005 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
3006 "loop beginning at %L", st->name, &s->head->loc);
3014 /* Checks to see if the current statement label closes an enddo.
3015 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
3016 an error) if it incorrectly closes an ENDDO. */
3019 check_do_closure (void)
3023 if (gfc_statement_label == NULL)
3026 for (p = gfc_state_stack; p; p = p->previous)
3027 if (p->state == COMP_DO)
3031 return 0; /* No loops to close */
3033 if (p->ext.end_do_label == gfc_statement_label)
3035 if (p == gfc_state_stack)
3038 gfc_error ("End of nonblock DO statement at %C is within another block");
3042 /* At this point, the label doesn't terminate the innermost loop.
3043 Make sure it doesn't terminate another one. */
3044 for (; p; p = p->previous)
3045 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
3047 gfc_error ("End of nonblock DO statement at %C is interwoven "
3048 "with another DO loop");
3056 /* Parse a series of contained program units. */
3058 static void parse_progunit (gfc_statement);
3061 /* Parse a CRITICAL block. */
3064 parse_critical_block (void)
3070 s.ext.end_do_label = new_st.label1;
3072 accept_statement (ST_CRITICAL);
3073 top = gfc_state_stack->tail;
3075 push_state (&s, COMP_CRITICAL, gfc_new_block);
3077 d = add_statement ();
3078 d->op = EXEC_CRITICAL;
3083 st = parse_executable (ST_NONE);
3091 case ST_END_CRITICAL:
3092 if (s.ext.end_do_label != NULL
3093 && s.ext.end_do_label != gfc_statement_label)
3094 gfc_error_now ("Statement label in END CRITICAL at %C does not "
3095 "match CRITIAL label");
3097 if (gfc_statement_label != NULL)
3099 new_st.op = EXEC_NOP;
3105 unexpected_statement (st);
3109 while (st != ST_END_CRITICAL);
3112 accept_statement (st);
3116 /* Set up the local namespace for a BLOCK construct. */
3119 gfc_build_block_ns (gfc_namespace *parent_ns)
3121 gfc_namespace* my_ns;
3123 my_ns = gfc_get_namespace (parent_ns, 1);
3124 my_ns->construct_entities = 1;
3126 /* Give the BLOCK a symbol of flavor LABEL; this is later needed for correct
3127 code generation (so it must not be NULL).
3128 We set its recursive argument if our container procedure is recursive, so
3129 that local variables are accordingly placed on the stack when it
3130 will be necessary. */
3132 my_ns->proc_name = gfc_new_block;
3137 gfc_get_symbol ("block@", my_ns, &my_ns->proc_name);
3138 t = gfc_add_flavor (&my_ns->proc_name->attr, FL_LABEL,
3139 my_ns->proc_name->name, NULL);
3140 gcc_assert (t == SUCCESS);
3143 if (parent_ns->proc_name)
3144 my_ns->proc_name->attr.recursive = parent_ns->proc_name->attr.recursive;
3150 /* Parse a BLOCK construct. */
3153 parse_block_construct (void)
3155 gfc_namespace* my_ns;
3158 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BLOCK construct at %C");
3160 my_ns = gfc_build_block_ns (gfc_current_ns);
3162 new_st.op = EXEC_BLOCK;
3163 new_st.ext.ns = my_ns;
3164 accept_statement (ST_BLOCK);
3166 push_state (&s, COMP_BLOCK, my_ns->proc_name);
3167 gfc_current_ns = my_ns;
3169 parse_progunit (ST_NONE);
3171 gfc_current_ns = gfc_current_ns->parent;
3176 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
3177 handled inside of parse_executable(), because they aren't really
3181 parse_do_block (void)
3188 s.ext.end_do_label = new_st.label1;
3190 if (new_st.ext.iterator != NULL)
3191 stree = new_st.ext.iterator->var->symtree;
3195 accept_statement (ST_DO);
3197 top = gfc_state_stack->tail;
3198 push_state (&s, COMP_DO, gfc_new_block);
3200 s.do_variable = stree;
3202 top->block = new_level (top);
3203 top->block->op = EXEC_DO;
3206 st = parse_executable (ST_NONE);
3214 if (s.ext.end_do_label != NULL
3215 && s.ext.end_do_label != gfc_statement_label)
3216 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
3219 if (gfc_statement_label != NULL)
3221 new_st.op = EXEC_NOP;
3226 case ST_IMPLIED_ENDDO:
3227 /* If the do-stmt of this DO construct has a do-construct-name,
3228 the corresponding end-do must be an end-do-stmt (with a matching
3229 name, but in that case we must have seen ST_ENDDO first).
3230 We only complain about this in pedantic mode. */
3231 if (gfc_current_block () != NULL)
3232 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
3233 &gfc_current_block()->declared_at);
3238 unexpected_statement (st);
3243 accept_statement (st);
3247 /* Parse the statements of OpenMP do/parallel do. */
3249 static gfc_statement
3250 parse_omp_do (gfc_statement omp_st)
3256 accept_statement (omp_st);
3258 cp = gfc_state_stack->tail;
3259 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3260 np = new_level (cp);
3266 st = next_statement ();
3269 else if (st == ST_DO)
3272 unexpected_statement (st);
3276 if (gfc_statement_label != NULL
3277 && gfc_state_stack->previous != NULL
3278 && gfc_state_stack->previous->state == COMP_DO
3279 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3287 there should be no !$OMP END DO. */
3289 return ST_IMPLIED_ENDDO;
3292 check_do_closure ();
3295 st = next_statement ();
3296 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3298 if (new_st.op == EXEC_OMP_END_NOWAIT)
3299 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3301 gcc_assert (new_st.op == EXEC_NOP);
3302 gfc_clear_new_st ();
3303 gfc_commit_symbols ();
3304 gfc_warning_check ();
3305 st = next_statement ();
3311 /* Parse the statements of OpenMP atomic directive. */
3314 parse_omp_atomic (void)
3320 accept_statement (ST_OMP_ATOMIC);
3322 cp = gfc_state_stack->tail;
3323 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3324 np = new_level (cp);
3330 st = next_statement ();
3333 else if (st == ST_ASSIGNMENT)
3336 unexpected_statement (st);
3339 accept_statement (st);
3345 /* Parse the statements of an OpenMP structured block. */
3348 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3350 gfc_statement st, omp_end_st;
3354 accept_statement (omp_st);
3356 cp = gfc_state_stack->tail;
3357 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3358 np = new_level (cp);
3364 case ST_OMP_PARALLEL:
3365 omp_end_st = ST_OMP_END_PARALLEL;
3367 case ST_OMP_PARALLEL_SECTIONS:
3368 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3370 case ST_OMP_SECTIONS:
3371 omp_end_st = ST_OMP_END_SECTIONS;
3373 case ST_OMP_ORDERED:
3374 omp_end_st = ST_OMP_END_ORDERED;
3376 case ST_OMP_CRITICAL:
3377 omp_end_st = ST_OMP_END_CRITICAL;
3380 omp_end_st = ST_OMP_END_MASTER;
3383 omp_end_st = ST_OMP_END_SINGLE;
3386 omp_end_st = ST_OMP_END_TASK;
3388 case ST_OMP_WORKSHARE:
3389 omp_end_st = ST_OMP_END_WORKSHARE;
3391 case ST_OMP_PARALLEL_WORKSHARE:
3392 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3400 if (workshare_stmts_only)
3402 /* Inside of !$omp workshare, only
3405 where statements and constructs
3406 forall statements and constructs
3410 are allowed. For !$omp critical these
3411 restrictions apply recursively. */
3414 st = next_statement ();
3425 accept_statement (st);
3428 case ST_WHERE_BLOCK:
3429 parse_where_block ();
3432 case ST_FORALL_BLOCK:
3433 parse_forall_block ();
3436 case ST_OMP_PARALLEL:
3437 case ST_OMP_PARALLEL_SECTIONS:
3438 parse_omp_structured_block (st, false);
3441 case ST_OMP_PARALLEL_WORKSHARE:
3442 case ST_OMP_CRITICAL:
3443 parse_omp_structured_block (st, true);
3446 case ST_OMP_PARALLEL_DO:
3447 st = parse_omp_do (st);
3451 parse_omp_atomic ();
3462 st = next_statement ();
3466 st = parse_executable (ST_NONE);
3469 else if (st == ST_OMP_SECTION
3470 && (omp_st == ST_OMP_SECTIONS
3471 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3473 np = new_level (np);
3477 else if (st != omp_end_st)
3478 unexpected_statement (st);
3480 while (st != omp_end_st);
3484 case EXEC_OMP_END_NOWAIT:
3485 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3487 case EXEC_OMP_CRITICAL:
3488 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3489 || (new_st.ext.omp_name != NULL
3490 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3491 gfc_error ("Name after !$omp critical and !$omp end critical does "
3493 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3495 case EXEC_OMP_END_SINGLE:
3496 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3497 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3498 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3499 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3507 gfc_clear_new_st ();
3508 gfc_commit_symbols ();
3509 gfc_warning_check ();
3514 /* Accept a series of executable statements. We return the first
3515 statement that doesn't fit to the caller. Any block statements are
3516 passed on to the correct handler, which usually passes the buck
3519 static gfc_statement
3520 parse_executable (gfc_statement st)
3525 st = next_statement ();
3529 close_flag = check_do_closure ();
3534 case ST_END_PROGRAM:
3537 case ST_END_FUNCTION:
3542 case ST_END_SUBROUTINE:
3549 case ST_SELECT_CASE:
3550 gfc_error ("%s statement at %C cannot terminate a non-block "
3551 "DO loop", gfc_ascii_statement (st));
3567 accept_statement (st);
3568 if (close_flag == 1)
3569 return ST_IMPLIED_ENDDO;
3573 parse_block_construct ();
3580 case ST_SELECT_CASE:
3581 parse_select_block ();
3584 case ST_SELECT_TYPE:
3585 parse_select_type_block();
3590 if (check_do_closure () == 1)
3591 return ST_IMPLIED_ENDDO;
3595 parse_critical_block ();
3598 case ST_WHERE_BLOCK:
3599 parse_where_block ();
3602 case ST_FORALL_BLOCK:
3603 parse_forall_block ();
3606 case ST_OMP_PARALLEL:
3607 case ST_OMP_PARALLEL_SECTIONS:
3608 case ST_OMP_SECTIONS:
3609 case ST_OMP_ORDERED:
3610 case ST_OMP_CRITICAL:
3614 parse_omp_structured_block (st, false);
3617 case ST_OMP_WORKSHARE:
3618 case ST_OMP_PARALLEL_WORKSHARE:
3619 parse_omp_structured_block (st, true);
3623 case ST_OMP_PARALLEL_DO:
3624 st = parse_omp_do (st);
3625 if (st == ST_IMPLIED_ENDDO)
3630 parse_omp_atomic ();
3637 st = next_statement ();
3642 /* Fix the symbols for sibling functions. These are incorrectly added to
3643 the child namespace as the parser didn't know about this procedure. */
3646 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3650 gfc_symbol *old_sym;
3652 sym->attr.referenced = 1;
3653 for (ns = siblings; ns; ns = ns->sibling)
3655 st = gfc_find_symtree (ns->sym_root, sym->name);
3657 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3658 goto fixup_contained;
3660 old_sym = st->n.sym;
3661 if (old_sym->ns == ns
3662 && !old_sym->attr.contained
3664 /* By 14.6.1.3, host association should be excluded
3665 for the following. */
3666 && !(old_sym->attr.external
3667 || (old_sym->ts.type != BT_UNKNOWN
3668 && !old_sym->attr.implicit_type)
3669 || old_sym->attr.flavor == FL_PARAMETER
3670 || old_sym->attr.use_assoc
3671 || old_sym->attr.in_common
3672 || old_sym->attr.in_equivalence
3673 || old_sym->attr.data
3674 || old_sym->attr.dummy
3675 || old_sym->attr.result
3676 || old_sym->attr.dimension
3677 || old_sym->attr.allocatable
3678 || old_sym->attr.intrinsic
3679 || old_sym->attr.generic
3680 || old_sym->attr.flavor == FL_NAMELIST
3681 || old_sym->attr.proc == PROC_ST_FUNCTION))
3683 /* Replace it with the symbol from the parent namespace. */
3687 /* Free the old (local) symbol. */
3689 if (old_sym->refs == 0)
3690 gfc_free_symbol (old_sym);
3694 /* Do the same for any contained procedures. */
3695 gfc_fixup_sibling_symbols (sym, ns->contained);
3700 parse_contained (int module)
3702 gfc_namespace *ns, *parent_ns, *tmp;
3703 gfc_state_data s1, s2;
3707 int contains_statements = 0;
3710 push_state (&s1, COMP_CONTAINS, NULL);
3711 parent_ns = gfc_current_ns;
3715 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3717 gfc_current_ns->sibling = parent_ns->contained;
3718 parent_ns->contained = gfc_current_ns;
3721 /* Process the next available statement. We come here if we got an error
3722 and rejected the last statement. */
3723 st = next_statement ();
3732 contains_statements = 1;
3733 accept_statement (st);
3736 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3739 /* For internal procedures, create/update the symbol in the
3740 parent namespace. */
3744 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3745 gfc_error ("Contained procedure '%s' at %C is already "
3746 "ambiguous", gfc_new_block->name);
3749 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3750 &gfc_new_block->declared_at) ==
3753 if (st == ST_FUNCTION)
3754 gfc_add_function (&sym->attr, sym->name,
3755 &gfc_new_block->declared_at);
3757 gfc_add_subroutine (&sym->attr, sym->name,
3758 &gfc_new_block->declared_at);
3762 gfc_commit_symbols ();
3765 sym = gfc_new_block;
3767 /* Mark this as a contained function, so it isn't replaced
3768 by other module functions. */
3769 sym->attr.contained = 1;
3770 sym->attr.referenced = 1;
3772 parse_progunit (ST_NONE);
3774 /* Fix up any sibling functions that refer to this one. */
3775 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3776 /* Or refer to any of its alternate entry points. */
3777 for (el = gfc_current_ns->entries; el; el = el->next)
3778 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3780 gfc_current_ns->code = s2.head;
3781 gfc_current_ns = parent_ns;
3786 /* These statements are associated with the end of the host unit. */
3787 case ST_END_FUNCTION:
3789 case ST_END_PROGRAM:
3790 case ST_END_SUBROUTINE:
3791 accept_statement (st);
3795 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3796 gfc_ascii_statement (st));
3797 reject_statement ();
3803 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3804 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3806 /* The first namespace in the list is guaranteed to not have
3807 anything (worthwhile) in it. */
3808 tmp = gfc_current_ns;
3809 gfc_current_ns = parent_ns;
3810 if (seen_error && tmp->refs > 1)
3811 gfc_free_namespace (tmp);
3813 ns = gfc_current_ns->contained;
3814 gfc_current_ns->contained = ns->sibling;
3815 gfc_free_namespace (ns);
3818 if (!contains_statements)
3819 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3820 "FUNCTION or SUBROUTINE statement at %C");
3824 /* Parse a PROGRAM, SUBROUTINE, FUNCTION unit or BLOCK construct. */
3827 parse_progunit (gfc_statement st)
3832 st = parse_spec (st);
3839 /* This is not allowed within BLOCK! */
3840 if (gfc_current_state () != COMP_BLOCK)
3845 accept_statement (st);
3852 if (gfc_current_state () == COMP_FUNCTION)
3853 gfc_check_function_type (gfc_current_ns);
3858 st = parse_executable (st);
3866 /* This is not allowed within BLOCK! */
3867 if (gfc_current_state () != COMP_BLOCK)
3872 accept_statement (st);
3879 unexpected_statement (st);
3880 reject_statement ();
3881 st = next_statement ();
3887 for (p = gfc_state_stack; p; p = p->previous)
3888 if (p->state == COMP_CONTAINS)
3891 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3896 gfc_error ("CONTAINS statement at %C is already in a contained "
3898 st = next_statement ();
3902 parse_contained (0);
3905 gfc_current_ns->code = gfc_state_stack->head;
3909 /* Come here to complain about a global symbol already in use as
3913 gfc_global_used (gfc_gsymbol *sym, locus *where)
3918 where = &gfc_current_locus;
3928 case GSYM_SUBROUTINE:
3929 name = "SUBROUTINE";
3934 case GSYM_BLOCK_DATA:
3935 name = "BLOCK DATA";
3941 gfc_internal_error ("gfc_global_used(): Bad type");
3945 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3946 sym->name, where, name, &sym->where);
3950 /* Parse a block data program unit. */
3953 parse_block_data (void)
3956 static locus blank_locus;
3957 static int blank_block=0;
3960 gfc_current_ns->proc_name = gfc_new_block;
3961 gfc_current_ns->is_block_data = 1;
3963 if (gfc_new_block == NULL)
3966 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3967 "prior BLOCK DATA at %L", &blank_locus);
3971 blank_locus = gfc_current_locus;
3976 s = gfc_get_gsymbol (gfc_new_block->name);
3978 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3979 gfc_global_used(s, NULL);
3982 s->type = GSYM_BLOCK_DATA;
3983 s->where = gfc_current_locus;
3988 st = parse_spec (ST_NONE);
3990 while (st != ST_END_BLOCK_DATA)
3992 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3993 gfc_ascii_statement (st));
3994 reject_statement ();
3995 st = next_statement ();
4000 /* Parse a module subprogram. */
4008 s = gfc_get_gsymbol (gfc_new_block->name);
4009 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
4010 gfc_global_used(s, NULL);
4013 s->type = GSYM_MODULE;
4014 s->where = gfc_current_locus;
4018 st = parse_spec (ST_NONE);
4027 parse_contained (1);
4031 accept_statement (st);
4035 gfc_error ("Unexpected %s statement in MODULE at %C",
4036 gfc_ascii_statement (st));
4038 reject_statement ();
4039 st = next_statement ();
4043 s->ns = gfc_current_ns;
4047 /* Add a procedure name to the global symbol table. */
4050 add_global_procedure (int sub)
4054 s = gfc_get_gsymbol(gfc_new_block->name);
4057 || (s->type != GSYM_UNKNOWN
4058 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
4059 gfc_global_used(s, NULL);
4062 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4063 s->where = gfc_current_locus;
4065 s->ns = gfc_current_ns;
4070 /* Add a program to the global symbol table. */
4073 add_global_program (void)
4077 if (gfc_new_block == NULL)
4079 s = gfc_get_gsymbol (gfc_new_block->name);
4081 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
4082 gfc_global_used(s, NULL);
4085 s->type = GSYM_PROGRAM;
4086 s->where = gfc_current_locus;
4088 s->ns = gfc_current_ns;
4093 /* Resolve all the program units when whole file scope option
4096 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
4098 gfc_free_dt_list ();
4099 gfc_current_ns = gfc_global_ns_list;
4100 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4102 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4103 gfc_resolve (gfc_current_ns);
4104 gfc_current_ns->derived_types = gfc_derived_types;
4105 gfc_derived_types = NULL;
4111 clean_up_modules (gfc_gsymbol *gsym)
4116 clean_up_modules (gsym->left);
4117 clean_up_modules (gsym->right);
4119 if (gsym->type != GSYM_MODULE || !gsym->ns)
4122 gfc_current_ns = gsym->ns;
4123 gfc_derived_types = gfc_current_ns->derived_types;
4130 /* Translate all the program units when whole file scope option
4131 is active. This could be in a different order to resolution if
4132 there are forward references in the file. */
4134 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
4138 gfc_current_ns = gfc_global_ns_list;
4139 gfc_get_errors (NULL, &errors);
4141 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4143 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
4144 gfc_derived_types = gfc_current_ns->derived_types;
4145 gfc_generate_code (gfc_current_ns);
4146 gfc_current_ns->translated = 1;
4149 /* Clean up all the namespaces after translation. */
4150 gfc_current_ns = gfc_global_ns_list;
4151 for (;gfc_current_ns;)
4153 gfc_namespace *ns = gfc_current_ns->sibling;
4154 gfc_derived_types = gfc_current_ns->derived_types;
4156 gfc_current_ns = ns;
4159 clean_up_modules (gfc_gsym_root);
4163 /* Top level parser. */
4166 gfc_parse_file (void)
4168 int seen_program, errors_before, errors;
4169 gfc_state_data top, s;
4172 gfc_namespace *next;
4174 gfc_start_source_files ();
4176 top.state = COMP_NONE;
4178 top.previous = NULL;
4179 top.head = top.tail = NULL;
4180 top.do_variable = NULL;
4182 gfc_state_stack = ⊤
4184 gfc_clear_new_st ();
4186 gfc_statement_label = NULL;
4188 if (setjmp (eof_buf))
4189 return FAILURE; /* Come here on unexpected EOF */
4191 /* Prepare the global namespace that will contain the
4193 gfc_global_ns_list = next = NULL;
4197 /* Exit early for empty files. */
4203 st = next_statement ();
4212 goto duplicate_main;
4214 prog_locus = gfc_current_locus;
4216 push_state (&s, COMP_PROGRAM, gfc_new_block);
4217 main_program_symbol(gfc_current_ns, gfc_new_block->name);
4218 accept_statement (st);
4219 add_global_program ();
4220 parse_progunit (ST_NONE);
4221 if (gfc_option.flag_whole_file)
4226 add_global_procedure (1);
4227 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
4228 accept_statement (st);
4229 parse_progunit (ST_NONE);
4230 if (gfc_option.flag_whole_file)
4235 add_global_procedure (0);
4236 push_state (&s, COMP_FUNCTION, gfc_new_block);
4237 accept_statement (st);
4238 parse_progunit (ST_NONE);
4239 if (gfc_option.flag_whole_file)
4244 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
4245 accept_statement (st);
4246 parse_block_data ();
4250 push_state (&s, COMP_MODULE, gfc_new_block);
4251 accept_statement (st);
4253 gfc_get_errors (NULL, &errors_before);
4257 /* Anything else starts a nameless main program block. */
4260 goto duplicate_main;
4262 prog_locus = gfc_current_locus;
4264 push_state (&s, COMP_PROGRAM, gfc_new_block);
4265 main_program_symbol (gfc_current_ns, "MAIN__");
4266 parse_progunit (st);
4267 if (gfc_option.flag_whole_file)
4272 /* Handle the non-program units. */
4273 gfc_current_ns->code = s.head;
4275 gfc_resolve (gfc_current_ns);
4277 /* Dump the parse tree if requested. */
4278 if (gfc_option.dump_parse_tree)
4279 gfc_dump_parse_tree (gfc_current_ns, stdout);
4281 gfc_get_errors (NULL, &errors);
4282 if (s.state == COMP_MODULE)
4284 gfc_dump_module (s.sym->name, errors_before == errors);
4286 gfc_generate_module_code (gfc_current_ns);
4288 if (!gfc_option.flag_whole_file)
4292 gfc_current_ns->derived_types = gfc_derived_types;
4293 gfc_derived_types = NULL;
4294 gfc_current_ns = NULL;
4300 gfc_generate_code (gfc_current_ns);
4308 /* The main program and non-contained procedures are put
4309 in the global namespace list, so that they can be processed
4310 later and all their interfaces resolved. */
4311 gfc_current_ns->code = s.head;
4313 next->sibling = gfc_current_ns;
4315 gfc_global_ns_list = gfc_current_ns;
4317 next = gfc_current_ns;
4324 if (!gfc_option.flag_whole_file)
4327 /* Do the resolution. */
4328 resolve_all_program_units (gfc_global_ns_list);
4330 /* Do the parse tree dump. */
4332 = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
4334 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4336 gfc_dump_parse_tree (gfc_current_ns, stdout);
4337 fputs ("------------------------------------------\n\n", stdout);
4340 /* Do the translation. */
4341 translate_all_program_units (gfc_global_ns_list);
4345 gfc_end_source_files ();
4349 /* If we see a duplicate main program, shut down. If the second
4350 instance is an implied main program, i.e. data decls or executable
4351 statements, we're in for lots of errors. */
4352 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4353 reject_statement ();