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 ()->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,
135 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
142 match ("data", gfc_match_data, ST_DATA);
143 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
147 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
148 match ("entry% ", gfc_match_entry, ST_ENTRY);
149 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
150 match ("external", gfc_match_external, ST_ATTR_DECL);
154 match ("format", gfc_match_format, ST_FORMAT);
161 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
162 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
163 match ("interface", gfc_match_interface, ST_INTERFACE);
164 match ("intent", gfc_match_intent, ST_ATTR_DECL);
165 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
172 match ("namelist", gfc_match_namelist, ST_NAMELIST);
176 match ("optional", gfc_match_optional, ST_ATTR_DECL);
180 match ("parameter", gfc_match_parameter, ST_PARAMETER);
181 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
182 if (gfc_match_private (&st) == MATCH_YES)
184 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
185 if (gfc_match_public (&st) == MATCH_YES)
187 match ("protected", gfc_match_protected, ST_ATTR_DECL);
194 match ("save", gfc_match_save, ST_ATTR_DECL);
198 match ("target", gfc_match_target, ST_ATTR_DECL);
199 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
206 match ("value", gfc_match_value, ST_ATTR_DECL);
207 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
214 /* This is not a specification statement. See if any of the matchers
215 has stored an error message of some sort. */
219 gfc_buffer_error (0);
220 gfc_current_locus = old_locus;
222 return ST_GET_FCN_CHARACTERISTICS;
226 /* This is the primary 'decode_statement'. */
228 decode_statement (void)
239 gfc_clear_error (); /* Clear any pending errors. */
240 gfc_clear_warning (); /* Clear any pending warnings. */
242 gfc_matching_function = false;
244 if (gfc_match_eos () == MATCH_YES)
247 if (gfc_current_state () == COMP_FUNCTION
248 && gfc_current_block ()->result->ts.kind == -1)
249 return decode_specification_statement ();
251 old_locus = gfc_current_locus;
253 /* Try matching a data declaration or function declaration. The
254 input "REALFUNCTIONA(N)" can mean several things in different
255 contexts, so it (and its relatives) get special treatment. */
257 if (gfc_current_state () == COMP_NONE
258 || gfc_current_state () == COMP_INTERFACE
259 || gfc_current_state () == COMP_CONTAINS)
261 gfc_matching_function = true;
262 m = gfc_match_function_decl ();
265 else if (m == MATCH_ERROR)
269 gfc_current_locus = old_locus;
271 gfc_matching_function = false;
274 /* Match statements whose error messages are meant to be overwritten
275 by something better. */
277 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
278 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
279 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
281 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
282 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
284 /* Try to match a subroutine statement, which has the same optional
285 prefixes that functions can have. */
287 if (gfc_match_subroutine () == MATCH_YES)
288 return ST_SUBROUTINE;
290 gfc_current_locus = old_locus;
292 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
293 might begin with a block label. The match functions for these
294 statements are unusual in that their keyword is not seen before
295 the matcher is called. */
297 if (gfc_match_if (&st) == MATCH_YES)
300 gfc_current_locus = old_locus;
302 if (gfc_match_where (&st) == MATCH_YES)
305 gfc_current_locus = old_locus;
307 if (gfc_match_forall (&st) == MATCH_YES)
310 gfc_current_locus = old_locus;
312 match (NULL, gfc_match_do, ST_DO);
313 match (NULL, gfc_match_select, ST_SELECT_CASE);
315 /* General statement matching: Instead of testing every possible
316 statement, we eliminate most possibilities by peeking at the
319 c = gfc_peek_ascii_char ();
324 match ("abstract% interface", gfc_match_abstract_interface,
326 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
327 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
328 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
332 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
333 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
334 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
338 match ("call", gfc_match_call, ST_CALL);
339 match ("close", gfc_match_close, ST_CLOSE);
340 match ("continue", gfc_match_continue, ST_CONTINUE);
341 match ("cycle", gfc_match_cycle, ST_CYCLE);
342 match ("case", gfc_match_case, ST_CASE);
343 match ("common", gfc_match_common, ST_COMMON);
344 match ("contains", gfc_match_eos, ST_CONTAINS);
348 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
349 match ("data", gfc_match_data, ST_DATA);
350 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
354 match ("end file", gfc_match_endfile, ST_END_FILE);
355 match ("exit", gfc_match_exit, ST_EXIT);
356 match ("else", gfc_match_else, ST_ELSE);
357 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
358 match ("else if", gfc_match_elseif, ST_ELSEIF);
359 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
361 if (gfc_match_end (&st) == MATCH_YES)
364 match ("entry% ", gfc_match_entry, ST_ENTRY);
365 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
366 match ("external", gfc_match_external, ST_ATTR_DECL);
370 match ("final", gfc_match_final_decl, ST_FINAL);
371 match ("flush", gfc_match_flush, ST_FLUSH);
372 match ("format", gfc_match_format, ST_FORMAT);
376 match ("generic", gfc_match_generic, ST_GENERIC);
377 match ("go to", gfc_match_goto, ST_GOTO);
381 match ("inquire", gfc_match_inquire, ST_INQUIRE);
382 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
383 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
384 match ("import", gfc_match_import, ST_IMPORT);
385 match ("interface", gfc_match_interface, ST_INTERFACE);
386 match ("intent", gfc_match_intent, ST_ATTR_DECL);
387 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
391 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
392 match ("module", gfc_match_module, ST_MODULE);
396 match ("nullify", gfc_match_nullify, ST_NULLIFY);
397 match ("namelist", gfc_match_namelist, ST_NAMELIST);
401 match ("open", gfc_match_open, ST_OPEN);
402 match ("optional", gfc_match_optional, ST_ATTR_DECL);
406 match ("print", gfc_match_print, ST_WRITE);
407 match ("parameter", gfc_match_parameter, ST_PARAMETER);
408 match ("pause", gfc_match_pause, ST_PAUSE);
409 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
410 if (gfc_match_private (&st) == MATCH_YES)
412 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
413 match ("program", gfc_match_program, ST_PROGRAM);
414 if (gfc_match_public (&st) == MATCH_YES)
416 match ("protected", gfc_match_protected, ST_ATTR_DECL);
420 match ("read", gfc_match_read, ST_READ);
421 match ("return", gfc_match_return, ST_RETURN);
422 match ("rewind", gfc_match_rewind, ST_REWIND);
426 match ("sequence", gfc_match_eos, ST_SEQUENCE);
427 match ("stop", gfc_match_stop, ST_STOP);
428 match ("save", gfc_match_save, ST_ATTR_DECL);
432 match ("target", gfc_match_target, ST_ATTR_DECL);
433 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
437 match ("use", gfc_match_use, ST_USE);
441 match ("value", gfc_match_value, ST_ATTR_DECL);
442 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
446 match ("wait", gfc_match_wait, ST_WAIT);
447 match ("write", gfc_match_write, ST_WRITE);
451 /* All else has failed, so give up. See if any of the matchers has
452 stored an error message of some sort. */
454 if (gfc_error_check () == 0)
455 gfc_error_now ("Unclassifiable statement at %C");
459 gfc_error_recovery ();
465 decode_omp_directive (void)
474 gfc_clear_error (); /* Clear any pending errors. */
475 gfc_clear_warning (); /* Clear any pending warnings. */
479 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
480 "or ELEMENTAL procedures");
481 gfc_error_recovery ();
485 old_locus = gfc_current_locus;
487 /* General OpenMP directive matching: Instead of testing every possible
488 statement, we eliminate most possibilities by peeking at the
491 c = gfc_peek_ascii_char ();
496 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
499 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
502 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
505 match ("do", gfc_match_omp_do, ST_OMP_DO);
508 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
509 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
510 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
511 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
512 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
513 match ("end parallel sections", gfc_match_omp_eos,
514 ST_OMP_END_PARALLEL_SECTIONS);
515 match ("end parallel workshare", gfc_match_omp_eos,
516 ST_OMP_END_PARALLEL_WORKSHARE);
517 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
518 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
519 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
520 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
521 match ("end workshare", gfc_match_omp_end_nowait,
522 ST_OMP_END_WORKSHARE);
525 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
528 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
531 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
534 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
535 match ("parallel sections", gfc_match_omp_parallel_sections,
536 ST_OMP_PARALLEL_SECTIONS);
537 match ("parallel workshare", gfc_match_omp_parallel_workshare,
538 ST_OMP_PARALLEL_WORKSHARE);
539 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
542 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
543 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
544 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
547 match ("task", gfc_match_omp_task, ST_OMP_TASK);
548 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
549 match ("threadprivate", gfc_match_omp_threadprivate,
550 ST_OMP_THREADPRIVATE);
552 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
556 /* All else has failed, so give up. See if any of the matchers has
557 stored an error message of some sort. */
559 if (gfc_error_check () == 0)
560 gfc_error_now ("Unclassifiable OpenMP directive at %C");
564 gfc_error_recovery ();
572 /* Get the next statement in free form source. */
581 at_bol = gfc_at_bol ();
582 gfc_gobble_whitespace ();
584 c = gfc_peek_ascii_char ();
590 /* Found a statement label? */
591 m = gfc_match_st_label (&gfc_statement_label);
593 d = gfc_peek_ascii_char ();
594 if (m != MATCH_YES || !gfc_is_whitespace (d))
596 gfc_match_small_literal_int (&i, &cnt);
599 gfc_error_now ("Too many digits in statement label at %C");
602 gfc_error_now ("Zero is not a valid statement label at %C");
605 c = gfc_next_ascii_char ();
608 if (!gfc_is_whitespace (c))
609 gfc_error_now ("Non-numeric character in statement label at %C");
615 label_locus = gfc_current_locus;
617 gfc_gobble_whitespace ();
619 if (at_bol && gfc_peek_ascii_char () == ';')
621 gfc_error_now ("Semicolon at %C needs to be preceded by "
623 gfc_next_ascii_char (); /* Eat up the semicolon. */
627 if (gfc_match_eos () == MATCH_YES)
629 gfc_warning_now ("Ignoring statement label in empty statement "
631 gfc_free_st_label (gfc_statement_label);
632 gfc_statement_label = NULL;
639 /* Comments have already been skipped by the time we get here,
640 except for OpenMP directives. */
641 if (gfc_option.flag_openmp)
645 c = gfc_next_ascii_char ();
646 for (i = 0; i < 5; i++, c = gfc_next_ascii_char ())
647 gcc_assert (c == "!$omp"[i]);
649 gcc_assert (c == ' ' || c == '\t');
650 gfc_gobble_whitespace ();
651 return decode_omp_directive ();
655 if (at_bol && c == ';')
657 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
658 gfc_next_ascii_char (); /* Eat up the semicolon. */
662 return decode_statement ();
666 /* Get the next statement in fixed-form source. */
671 int label, digit_flag, i;
676 return decode_statement ();
678 /* Skip past the current label field, parsing a statement label if
679 one is there. This is a weird number parser, since the number is
680 contained within five columns and can have any kind of embedded
681 spaces. We also check for characters that make the rest of the
687 for (i = 0; i < 5; i++)
689 c = gfc_next_char_literal (0);
706 label = label * 10 + ((unsigned char) c - '0');
707 label_locus = gfc_current_locus;
711 /* Comments have already been skipped by the time we get
712 here, except for OpenMP directives. */
714 if (gfc_option.flag_openmp)
716 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
717 gcc_assert ((char) gfc_wide_tolower (c) == "*$omp"[i]);
719 if (c != ' ' && c != '0')
721 gfc_buffer_error (0);
722 gfc_error ("Bad continuation line at %C");
726 return decode_omp_directive ();
730 /* Comments have already been skipped by the time we get
731 here so don't bother checking for them. */
734 gfc_buffer_error (0);
735 gfc_error ("Non-numeric character in statement label at %C");
743 gfc_warning_now ("Zero is not a valid statement label at %C");
746 /* We've found a valid statement label. */
747 gfc_statement_label = gfc_get_st_label (label);
751 /* Since this line starts a statement, it cannot be a continuation
752 of a previous statement. If we see something here besides a
753 space or zero, it must be a bad continuation line. */
755 c = gfc_next_char_literal (0);
759 if (c != ' ' && c != '0')
761 gfc_buffer_error (0);
762 gfc_error ("Bad continuation line at %C");
766 /* Now that we've taken care of the statement label columns, we have
767 to make sure that the first nonblank character is not a '!'. If
768 it is, the rest of the line is a comment. */
772 loc = gfc_current_locus;
773 c = gfc_next_char_literal (0);
775 while (gfc_is_whitespace (c));
779 gfc_current_locus = loc;
783 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
787 if (gfc_match_eos () == MATCH_YES)
790 /* At this point, we've got a nonblank statement to parse. */
791 return decode_statement ();
795 gfc_warning ("Ignoring statement label in empty statement at %C");
801 /* Return the next non-ST_NONE statement to the caller. We also worry
802 about including files and the ends of include files at this stage. */
805 next_statement (void)
809 gfc_new_block = NULL;
811 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
814 gfc_statement_label = NULL;
815 gfc_buffer_error (1);
819 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
820 && gfc_current_locus.lb
821 && gfc_current_locus.lb->truncated)
822 gfc_warning_now ("Line truncated at %C");
827 gfc_skip_comments ();
835 if (gfc_define_undef_line ())
838 old_locus = gfc_current_locus;
840 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
846 gfc_buffer_error (0);
848 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
850 gfc_free_st_label (gfc_statement_label);
851 gfc_statement_label = NULL;
852 gfc_current_locus = old_locus;
856 check_statement_label (st);
862 /****************************** Parser ***********************************/
864 /* The parser subroutines are of type 'try' that fail if the file ends
867 /* Macros that expand to case-labels for various classes of
868 statements. Start with executable statements that directly do
871 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
872 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
873 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
874 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
875 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
876 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
877 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
878 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
879 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
881 /* Statements that mark other executable statements. */
883 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
884 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
885 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
886 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
887 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
888 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
891 /* Declaration statements */
893 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
894 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
895 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
898 /* Block end statements. Errors associated with interchanging these
899 are detected in gfc_match_end(). */
901 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
902 case ST_END_PROGRAM: case ST_END_SUBROUTINE
905 /* Push a new state onto the stack. */
908 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
910 p->state = new_state;
911 p->previous = gfc_state_stack;
913 p->head = p->tail = NULL;
914 p->do_variable = NULL;
919 /* Pop the current state. */
923 gfc_state_stack = gfc_state_stack->previous;
927 /* Try to find the given state in the state stack. */
930 gfc_find_state (gfc_compile_state state)
934 for (p = gfc_state_stack; p; p = p->previous)
935 if (p->state == state)
938 return (p == NULL) ? FAILURE : SUCCESS;
942 /* Starts a new level in the statement list. */
945 new_level (gfc_code *q)
949 p = q->block = gfc_get_code ();
951 gfc_state_stack->head = gfc_state_stack->tail = p;
957 /* Add the current new_st code structure and adds it to the current
958 program unit. As a side-effect, it zeroes the new_st. */
968 p->loc = gfc_current_locus;
970 if (gfc_state_stack->head == NULL)
971 gfc_state_stack->head = p;
973 gfc_state_stack->tail->next = p;
975 while (p->next != NULL)
978 gfc_state_stack->tail = p;
986 /* Frees everything associated with the current statement. */
989 undo_new_statement (void)
991 gfc_free_statements (new_st.block);
992 gfc_free_statements (new_st.next);
993 gfc_free_statement (&new_st);
998 /* If the current statement has a statement label, make sure that it
999 is allowed to, or should have one. */
1002 check_statement_label (gfc_statement st)
1006 if (gfc_statement_label == NULL)
1008 if (st == ST_FORMAT)
1009 gfc_error ("FORMAT statement at %L does not have a statement label",
1016 case ST_END_PROGRAM:
1017 case ST_END_FUNCTION:
1018 case ST_END_SUBROUTINE:
1024 type = ST_LABEL_TARGET;
1028 type = ST_LABEL_FORMAT;
1031 /* Statement labels are not restricted from appearing on a
1032 particular line. However, there are plenty of situations
1033 where the resulting label can't be referenced. */
1036 type = ST_LABEL_BAD_TARGET;
1040 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1042 new_st.here = gfc_statement_label;
1046 /* Figures out what the enclosing program unit is. This will be a
1047 function, subroutine, program, block data or module. */
1050 gfc_enclosing_unit (gfc_compile_state * result)
1054 for (p = gfc_state_stack; p; p = p->previous)
1055 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1056 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1057 || p->state == COMP_PROGRAM)
1066 *result = COMP_PROGRAM;
1071 /* Translate a statement enum to a string. */
1074 gfc_ascii_statement (gfc_statement st)
1080 case ST_ARITHMETIC_IF:
1081 p = _("arithmetic IF");
1087 p = _("attribute declaration");
1117 p = _("data declaration");
1125 case ST_DERIVED_DECL:
1126 p = _("derived type declaration");
1140 case ST_END_BLOCK_DATA:
1141 p = "END BLOCK DATA";
1152 case ST_END_FUNCTION:
1158 case ST_END_INTERFACE:
1159 p = "END INTERFACE";
1164 case ST_END_PROGRAM:
1170 case ST_END_SUBROUTINE:
1171 p = "END SUBROUTINE";
1182 case ST_EQUIVALENCE:
1191 case ST_FORALL_BLOCK: /* Fall through */
1213 case ST_IMPLICIT_NONE:
1214 p = "IMPLICIT NONE";
1216 case ST_IMPLIED_ENDDO:
1217 p = _("implied END DO");
1243 case ST_MODULE_PROC:
1244 p = "MODULE PROCEDURE";
1282 case ST_WHERE_BLOCK: /* Fall through */
1293 p = _("assignment");
1295 case ST_POINTER_ASSIGNMENT:
1296 p = _("pointer assignment");
1298 case ST_SELECT_CASE:
1307 case ST_STATEMENT_FUNCTION:
1308 p = "STATEMENT FUNCTION";
1310 case ST_LABEL_ASSIGNMENT:
1311 p = "LABEL ASSIGNMENT";
1314 p = "ENUM DEFINITION";
1317 p = "ENUMERATOR DEFINITION";
1325 case ST_OMP_BARRIER:
1326 p = "!$OMP BARRIER";
1328 case ST_OMP_CRITICAL:
1329 p = "!$OMP CRITICAL";
1334 case ST_OMP_END_CRITICAL:
1335 p = "!$OMP END CRITICAL";
1340 case ST_OMP_END_MASTER:
1341 p = "!$OMP END MASTER";
1343 case ST_OMP_END_ORDERED:
1344 p = "!$OMP END ORDERED";
1346 case ST_OMP_END_PARALLEL:
1347 p = "!$OMP END PARALLEL";
1349 case ST_OMP_END_PARALLEL_DO:
1350 p = "!$OMP END PARALLEL DO";
1352 case ST_OMP_END_PARALLEL_SECTIONS:
1353 p = "!$OMP END PARALLEL SECTIONS";
1355 case ST_OMP_END_PARALLEL_WORKSHARE:
1356 p = "!$OMP END PARALLEL WORKSHARE";
1358 case ST_OMP_END_SECTIONS:
1359 p = "!$OMP END SECTIONS";
1361 case ST_OMP_END_SINGLE:
1362 p = "!$OMP END SINGLE";
1364 case ST_OMP_END_TASK:
1365 p = "!$OMP END TASK";
1367 case ST_OMP_END_WORKSHARE:
1368 p = "!$OMP END WORKSHARE";
1376 case ST_OMP_ORDERED:
1377 p = "!$OMP ORDERED";
1379 case ST_OMP_PARALLEL:
1380 p = "!$OMP PARALLEL";
1382 case ST_OMP_PARALLEL_DO:
1383 p = "!$OMP PARALLEL DO";
1385 case ST_OMP_PARALLEL_SECTIONS:
1386 p = "!$OMP PARALLEL SECTIONS";
1388 case ST_OMP_PARALLEL_WORKSHARE:
1389 p = "!$OMP PARALLEL WORKSHARE";
1391 case ST_OMP_SECTIONS:
1392 p = "!$OMP SECTIONS";
1394 case ST_OMP_SECTION:
1395 p = "!$OMP SECTION";
1403 case ST_OMP_TASKWAIT:
1404 p = "!$OMP TASKWAIT";
1406 case ST_OMP_THREADPRIVATE:
1407 p = "!$OMP THREADPRIVATE";
1409 case ST_OMP_WORKSHARE:
1410 p = "!$OMP WORKSHARE";
1413 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1420 /* Create a symbol for the main program and assign it to ns->proc_name. */
1423 main_program_symbol (gfc_namespace *ns, const char *name)
1425 gfc_symbol *main_program;
1426 symbol_attribute attr;
1428 gfc_get_symbol (name, ns, &main_program);
1429 gfc_clear_attr (&attr);
1430 attr.flavor = FL_PROGRAM;
1431 attr.proc = PROC_UNKNOWN;
1432 attr.subroutine = 1;
1433 attr.access = ACCESS_PUBLIC;
1434 attr.is_main_program = 1;
1435 main_program->attr = attr;
1436 main_program->declared_at = gfc_current_locus;
1437 ns->proc_name = main_program;
1438 gfc_commit_symbols ();
1442 /* Do whatever is necessary to accept the last statement. */
1445 accept_statement (gfc_statement st)
1453 case ST_IMPLICIT_NONE:
1454 gfc_set_implicit_none ();
1463 gfc_current_ns->proc_name = gfc_new_block;
1466 /* If the statement is the end of a block, lay down a special code
1467 that allows a branch to the end of the block from within the
1468 construct. IF and SELECT are treated differently from DO
1469 (where EXEC_NOP is added inside the loop) for two
1471 1. END DO has a meaning in the sense that after a GOTO to
1472 it, the loop counter must be increased.
1473 2. IF blocks and SELECT blocks can consist of multiple
1474 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1475 Putting the label before the END IF would make the jump
1476 from, say, the ELSE IF block to the END IF illegal. */
1480 if (gfc_statement_label != NULL)
1482 new_st.op = EXEC_END_BLOCK;
1487 /* The end-of-program unit statements do not get the special
1488 marker and require a statement of some sort if they are a
1491 case ST_END_PROGRAM:
1492 case ST_END_FUNCTION:
1493 case ST_END_SUBROUTINE:
1494 if (gfc_statement_label != NULL)
1496 new_st.op = EXEC_RETURN;
1512 gfc_commit_symbols ();
1513 gfc_warning_check ();
1514 gfc_clear_new_st ();
1518 /* Undo anything tentative that has been built for the current
1522 reject_statement (void)
1524 /* Revert to the previous charlen chain. */
1525 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1526 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1528 gfc_new_block = NULL;
1529 gfc_undo_symbols ();
1530 gfc_clear_warning ();
1531 undo_new_statement ();
1535 /* Generic complaint about an out of order statement. We also do
1536 whatever is necessary to clean up. */
1539 unexpected_statement (gfc_statement st)
1541 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1543 reject_statement ();
1547 /* Given the next statement seen by the matcher, make sure that it is
1548 in proper order with the last. This subroutine is initialized by
1549 calling it with an argument of ST_NONE. If there is a problem, we
1550 issue an error and return FAILURE. Otherwise we return SUCCESS.
1552 Individual parsers need to verify that the statements seen are
1553 valid before calling here, i.e., ENTRY statements are not allowed in
1554 INTERFACE blocks. The following diagram is taken from the standard:
1556 +---------------------------------------+
1557 | program subroutine function module |
1558 +---------------------------------------+
1560 +---------------------------------------+
1562 +---------------------------------------+
1564 | +-----------+------------------+
1565 | | parameter | implicit |
1566 | +-----------+------------------+
1567 | format | | derived type |
1568 | entry | parameter | interface |
1569 | | data | specification |
1570 | | | statement func |
1571 | +-----------+------------------+
1572 | | data | executable |
1573 +--------+-----------+------------------+
1575 +---------------------------------------+
1576 | internal module/subprogram |
1577 +---------------------------------------+
1579 +---------------------------------------+
1586 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1587 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1590 gfc_statement last_statement;
1596 verify_st_order (st_state *p, gfc_statement st, bool silent)
1602 p->state = ORDER_START;
1606 if (p->state > ORDER_USE)
1608 p->state = ORDER_USE;
1612 if (p->state > ORDER_IMPORT)
1614 p->state = ORDER_IMPORT;
1617 case ST_IMPLICIT_NONE:
1618 if (p->state > ORDER_IMPLICIT_NONE)
1621 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1622 statement disqualifies a USE but not an IMPLICIT NONE.
1623 Duplicate IMPLICIT NONEs are caught when the implicit types
1626 p->state = ORDER_IMPLICIT_NONE;
1630 if (p->state > ORDER_IMPLICIT)
1632 p->state = ORDER_IMPLICIT;
1637 if (p->state < ORDER_IMPLICIT_NONE)
1638 p->state = ORDER_IMPLICIT_NONE;
1642 if (p->state >= ORDER_EXEC)
1644 if (p->state < ORDER_IMPLICIT)
1645 p->state = ORDER_IMPLICIT;
1649 if (p->state < ORDER_SPEC)
1650 p->state = ORDER_SPEC;
1655 case ST_DERIVED_DECL:
1657 if (p->state >= ORDER_EXEC)
1659 if (p->state < ORDER_SPEC)
1660 p->state = ORDER_SPEC;
1665 if (p->state < ORDER_EXEC)
1666 p->state = ORDER_EXEC;
1670 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1671 gfc_ascii_statement (st));
1674 /* All is well, record the statement in case we need it next time. */
1675 p->where = gfc_current_locus;
1676 p->last_statement = st;
1681 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1682 gfc_ascii_statement (st),
1683 gfc_ascii_statement (p->last_statement), &p->where);
1689 /* Handle an unexpected end of file. This is a show-stopper... */
1691 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1694 unexpected_eof (void)
1698 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1700 /* Memory cleanup. Move to "second to last". */
1701 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1704 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1707 longjmp (eof_buf, 1);
1711 /* Parse the CONTAINS section of a derived type definition. */
1713 gfc_access gfc_typebound_default_access;
1716 parse_derived_contains (void)
1719 bool seen_private = false;
1720 bool seen_comps = false;
1721 bool error_flag = false;
1724 gcc_assert (gfc_current_state () == COMP_DERIVED);
1725 gcc_assert (gfc_current_block ());
1727 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1729 if (gfc_current_block ()->attr.sequence)
1730 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1731 " section at %C", gfc_current_block ()->name);
1732 if (gfc_current_block ()->attr.is_bind_c)
1733 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1734 " section at %C", gfc_current_block ()->name);
1736 accept_statement (ST_CONTAINS);
1737 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1739 gfc_typebound_default_access = ACCESS_PUBLIC;
1745 st = next_statement ();
1753 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1758 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1759 " procedure at %C") == FAILURE)
1762 accept_statement (ST_PROCEDURE);
1767 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1768 " at %C") == FAILURE)
1771 accept_statement (ST_GENERIC);
1776 if (gfc_notify_std (GFC_STD_F2003,
1777 "Fortran 2003: FINAL procedure declaration"
1778 " at %C") == FAILURE)
1781 accept_statement (ST_FINAL);
1789 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1790 "definition at %C with empty CONTAINS "
1791 "section") == FAILURE))
1794 /* ST_END_TYPE is accepted by parse_derived after return. */
1798 if (gfc_find_state (COMP_MODULE) == FAILURE)
1800 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1808 gfc_error ("PRIVATE statement at %C must precede procedure"
1816 gfc_error ("Duplicate PRIVATE statement at %C");
1820 accept_statement (ST_PRIVATE);
1821 gfc_typebound_default_access = ACCESS_PRIVATE;
1822 seen_private = true;
1826 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1831 gfc_error ("Already inside a CONTAINS block at %C");
1836 unexpected_statement (st);
1842 gcc_assert (gfc_current_state () == COMP_DERIVED);
1848 /* Parse a derived type. */
1851 parse_derived (void)
1853 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1856 gfc_symbol *derived_sym = NULL;
1862 accept_statement (ST_DERIVED_DECL);
1863 push_state (&s, COMP_DERIVED, gfc_new_block);
1865 gfc_new_block->component_access = ACCESS_PUBLIC;
1872 while (compiling_type)
1874 st = next_statement ();
1881 accept_statement (st);
1886 gfc_error ("PROCEDURE binding at %C must be inside CONTAINS");
1891 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1900 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1901 "definition at %C without components")
1905 accept_statement (ST_END_TYPE);
1909 if (gfc_find_state (COMP_MODULE) == FAILURE)
1911 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1919 gfc_error ("PRIVATE statement at %C must precede "
1920 "structure components");
1927 gfc_error ("Duplicate PRIVATE statement at %C");
1931 s.sym->component_access = ACCESS_PRIVATE;
1933 accept_statement (ST_PRIVATE);
1940 gfc_error ("SEQUENCE statement at %C must precede "
1941 "structure components");
1946 if (gfc_current_block ()->attr.sequence)
1947 gfc_warning ("SEQUENCE attribute at %C already specified in "
1952 gfc_error ("Duplicate SEQUENCE statement at %C");
1957 gfc_add_sequence (&gfc_current_block ()->attr,
1958 gfc_current_block ()->name, NULL);
1962 if (gfc_notify_std (GFC_STD_F2003,
1963 "Fortran 2003: CONTAINS block in derived type"
1964 " definition at %C") == FAILURE)
1967 accept_statement (ST_CONTAINS);
1968 if (parse_derived_contains ())
1973 unexpected_statement (st);
1978 /* need to verify that all fields of the derived type are
1979 * interoperable with C if the type is declared to be bind(c)
1981 derived_sym = gfc_current_block();
1983 sym = gfc_current_block ();
1984 for (c = sym->components; c; c = c->next)
1986 /* Look for allocatable components. */
1987 if (c->attr.allocatable
1988 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1989 sym->attr.alloc_comp = 1;
1991 /* Look for pointer components. */
1993 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1994 sym->attr.pointer_comp = 1;
1996 /* Look for private components. */
1997 if (sym->component_access == ACCESS_PRIVATE
1998 || c->attr.access == ACCESS_PRIVATE
1999 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
2000 sym->attr.private_comp = 1;
2003 if (!seen_component)
2004 sym->attr.zero_comp = 1;
2010 /* Parse an ENUM. */
2019 int seen_enumerator = 0;
2023 push_state (&s, COMP_ENUM, gfc_new_block);
2027 while (compiling_enum)
2029 st = next_statement ();
2037 seen_enumerator = 1;
2038 accept_statement (st);
2043 if (!seen_enumerator)
2045 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2048 accept_statement (st);
2052 gfc_free_enum_history ();
2053 unexpected_statement (st);
2061 /* Parse an interface. We must be able to deal with the possibility
2062 of recursive interfaces. The parse_spec() subroutine is mutually
2063 recursive with parse_interface(). */
2065 static gfc_statement parse_spec (gfc_statement);
2068 parse_interface (void)
2070 gfc_compile_state new_state = COMP_NONE, current_state;
2071 gfc_symbol *prog_unit, *sym;
2072 gfc_interface_info save;
2073 gfc_state_data s1, s2;
2077 accept_statement (ST_INTERFACE);
2079 current_interface.ns = gfc_current_ns;
2080 save = current_interface;
2082 sym = (current_interface.type == INTERFACE_GENERIC
2083 || current_interface.type == INTERFACE_USER_OP)
2084 ? gfc_new_block : NULL;
2086 push_state (&s1, COMP_INTERFACE, sym);
2087 current_state = COMP_NONE;
2090 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2092 st = next_statement ();
2100 if (st == ST_SUBROUTINE)
2101 new_state = COMP_SUBROUTINE;
2102 else if (st == ST_FUNCTION)
2103 new_state = COMP_FUNCTION;
2104 if (gfc_new_block->attr.pointer)
2106 gfc_new_block->attr.pointer = 0;
2107 gfc_new_block->attr.proc_pointer = 1;
2109 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2110 gfc_new_block->formal, NULL) == FAILURE)
2112 reject_statement ();
2113 gfc_free_namespace (gfc_current_ns);
2119 case ST_MODULE_PROC: /* The module procedure matcher makes
2120 sure the context is correct. */
2121 accept_statement (st);
2122 gfc_free_namespace (gfc_current_ns);
2125 case ST_END_INTERFACE:
2126 gfc_free_namespace (gfc_current_ns);
2127 gfc_current_ns = current_interface.ns;
2131 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2132 gfc_ascii_statement (st));
2133 reject_statement ();
2134 gfc_free_namespace (gfc_current_ns);
2139 /* Make sure that a generic interface has only subroutines or
2140 functions and that the generic name has the right attribute. */
2141 if (current_interface.type == INTERFACE_GENERIC)
2143 if (current_state == COMP_NONE)
2145 if (new_state == COMP_FUNCTION)
2146 gfc_add_function (&sym->attr, sym->name, NULL);
2147 else if (new_state == COMP_SUBROUTINE)
2148 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2150 current_state = new_state;
2154 if (new_state != current_state)
2156 if (new_state == COMP_SUBROUTINE)
2157 gfc_error ("SUBROUTINE at %C does not belong in a "
2158 "generic function interface");
2160 if (new_state == COMP_FUNCTION)
2161 gfc_error ("FUNCTION at %C does not belong in a "
2162 "generic subroutine interface");
2167 if (current_interface.type == INTERFACE_ABSTRACT)
2169 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2170 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2171 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2172 "cannot be the same as an intrinsic type",
2173 gfc_new_block->name);
2176 push_state (&s2, new_state, gfc_new_block);
2177 accept_statement (st);
2178 prog_unit = gfc_new_block;
2179 prog_unit->formal_ns = gfc_current_ns;
2180 proc_locus = gfc_current_locus;
2183 /* Read data declaration statements. */
2184 st = parse_spec (ST_NONE);
2186 /* Since the interface block does not permit an IMPLICIT statement,
2187 the default type for the function or the result must be taken
2188 from the formal namespace. */
2189 if (new_state == COMP_FUNCTION)
2191 if (prog_unit->result == prog_unit
2192 && prog_unit->ts.type == BT_UNKNOWN)
2193 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2194 else if (prog_unit->result != prog_unit
2195 && prog_unit->result->ts.type == BT_UNKNOWN)
2196 gfc_set_default_type (prog_unit->result, 1,
2197 prog_unit->formal_ns);
2200 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2202 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2203 gfc_ascii_statement (st));
2204 reject_statement ();
2208 /* Add EXTERNAL attribute to function or subroutine. */
2209 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2210 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2212 current_interface = save;
2213 gfc_add_interface (prog_unit);
2216 if (current_interface.ns
2217 && current_interface.ns->proc_name
2218 && strcmp (current_interface.ns->proc_name->name,
2219 prog_unit->name) == 0)
2220 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2221 "enclosing procedure", prog_unit->name, &proc_locus);
2230 /* Associate function characteristics by going back to the function
2231 declaration and rematching the prefix. */
2234 match_deferred_characteristics (gfc_typespec * ts)
2237 match m = MATCH_ERROR;
2238 char name[GFC_MAX_SYMBOL_LEN + 1];
2240 loc = gfc_current_locus;
2242 gfc_current_locus = gfc_current_block ()->declared_at;
2245 gfc_buffer_error (1);
2246 m = gfc_match_prefix (ts);
2247 gfc_buffer_error (0);
2249 if (ts->type == BT_DERIVED)
2253 if (!ts->derived || !ts->derived->components)
2257 /* Only permit one go at the characteristic association. */
2261 /* Set the function locus correctly. If we have not found the
2262 function name, there is an error. */
2264 && gfc_match ("function% %n", name) == MATCH_YES
2265 && strcmp (name, gfc_current_block ()->name) == 0)
2267 gfc_current_block ()->declared_at = gfc_current_locus;
2268 gfc_commit_symbols ();
2273 gfc_current_locus =loc;
2278 /* Check specification-expressions in the function result of the currently
2279 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2280 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2281 scope are not yet parsed so this has to be delayed up to parse_spec. */
2284 check_function_result_typed (void)
2286 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2288 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2289 gcc_assert (ts->type != BT_UNKNOWN);
2291 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2292 /* TODO: Extend when KIND type parameters are implemented. */
2293 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2294 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2298 /* Parse a set of specification statements. Returns the statement
2299 that doesn't fit. */
2301 static gfc_statement
2302 parse_spec (gfc_statement st)
2305 bool function_result_typed = false;
2306 bool bad_characteristic = false;
2309 verify_st_order (&ss, ST_NONE, false);
2311 st = next_statement ();
2313 /* If we are not inside a function or don't have a result specified so far,
2314 do nothing special about it. */
2315 if (gfc_current_state () != COMP_FUNCTION)
2316 function_result_typed = true;
2319 gfc_symbol* proc = gfc_current_ns->proc_name;
2322 if (proc->result->ts.type == BT_UNKNOWN)
2323 function_result_typed = true;
2328 /* If we find a statement that can not be followed by an IMPLICIT statement
2329 (and thus we can expect to see none any further), type the function result
2330 if it has not yet been typed. Be careful not to give the END statement
2331 to verify_st_order! */
2332 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2334 bool verify_now = false;
2336 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2341 verify_st_order (&dummyss, ST_NONE, false);
2342 verify_st_order (&dummyss, st, false);
2344 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2350 check_function_result_typed ();
2351 function_result_typed = true;
2360 case ST_IMPLICIT_NONE:
2362 if (!function_result_typed)
2364 check_function_result_typed ();
2365 function_result_typed = true;
2371 case ST_DATA: /* Not allowed in interfaces */
2372 if (gfc_current_state () == COMP_INTERFACE)
2382 case ST_DERIVED_DECL:
2385 if (verify_st_order (&ss, st, false) == FAILURE)
2387 reject_statement ();
2388 st = next_statement ();
2398 case ST_DERIVED_DECL:
2404 if (gfc_current_state () != COMP_MODULE)
2406 gfc_error ("%s statement must appear in a MODULE",
2407 gfc_ascii_statement (st));
2411 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2413 gfc_error ("%s statement at %C follows another accessibility "
2414 "specification", gfc_ascii_statement (st));
2418 gfc_current_ns->default_access = (st == ST_PUBLIC)
2419 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2423 case ST_STATEMENT_FUNCTION:
2424 if (gfc_current_state () == COMP_MODULE)
2426 unexpected_statement (st);
2434 accept_statement (st);
2435 st = next_statement ();
2439 accept_statement (st);
2441 st = next_statement ();
2444 case ST_GET_FCN_CHARACTERISTICS:
2445 /* This statement triggers the association of a function's result
2447 ts = &gfc_current_block ()->result->ts;
2448 if (match_deferred_characteristics (ts) != MATCH_YES)
2449 bad_characteristic = true;
2451 st = next_statement ();
2458 /* If match_deferred_characteristics failed, then there is an error. */
2459 if (bad_characteristic)
2461 ts = &gfc_current_block ()->result->ts;
2462 if (ts->type != BT_DERIVED)
2463 gfc_error ("Bad kind expression for function '%s' at %L",
2464 gfc_current_block ()->name,
2465 &gfc_current_block ()->declared_at);
2467 gfc_error ("The type for function '%s' at %L is not accessible",
2468 gfc_current_block ()->name,
2469 &gfc_current_block ()->declared_at);
2471 gfc_current_block ()->ts.kind = 0;
2472 /* Keep the derived type; if it's bad, it will be discovered later. */
2473 if (!(ts->type == BT_DERIVED && ts->derived))
2474 ts->type = BT_UNKNOWN;
2481 /* Parse a WHERE block, (not a simple WHERE statement). */
2484 parse_where_block (void)
2486 int seen_empty_else;
2491 accept_statement (ST_WHERE_BLOCK);
2492 top = gfc_state_stack->tail;
2494 push_state (&s, COMP_WHERE, gfc_new_block);
2496 d = add_statement ();
2497 d->expr = top->expr;
2503 seen_empty_else = 0;
2507 st = next_statement ();
2513 case ST_WHERE_BLOCK:
2514 parse_where_block ();
2519 accept_statement (st);
2523 if (seen_empty_else)
2525 gfc_error ("ELSEWHERE statement at %C follows previous "
2526 "unmasked ELSEWHERE");
2530 if (new_st.expr == NULL)
2531 seen_empty_else = 1;
2533 d = new_level (gfc_state_stack->head);
2535 d->expr = new_st.expr;
2537 accept_statement (st);
2542 accept_statement (st);
2546 gfc_error ("Unexpected %s statement in WHERE block at %C",
2547 gfc_ascii_statement (st));
2548 reject_statement ();
2552 while (st != ST_END_WHERE);
2558 /* Parse a FORALL block (not a simple FORALL statement). */
2561 parse_forall_block (void)
2567 accept_statement (ST_FORALL_BLOCK);
2568 top = gfc_state_stack->tail;
2570 push_state (&s, COMP_FORALL, gfc_new_block);
2572 d = add_statement ();
2573 d->op = EXEC_FORALL;
2578 st = next_statement ();
2583 case ST_POINTER_ASSIGNMENT:
2586 accept_statement (st);
2589 case ST_WHERE_BLOCK:
2590 parse_where_block ();
2593 case ST_FORALL_BLOCK:
2594 parse_forall_block ();
2598 accept_statement (st);
2605 gfc_error ("Unexpected %s statement in FORALL block at %C",
2606 gfc_ascii_statement (st));
2608 reject_statement ();
2612 while (st != ST_END_FORALL);
2618 static gfc_statement parse_executable (gfc_statement);
2620 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2623 parse_if_block (void)
2632 accept_statement (ST_IF_BLOCK);
2634 top = gfc_state_stack->tail;
2635 push_state (&s, COMP_IF, gfc_new_block);
2637 new_st.op = EXEC_IF;
2638 d = add_statement ();
2640 d->expr = top->expr;
2646 st = parse_executable (ST_NONE);
2656 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2657 "statement at %L", &else_locus);
2659 reject_statement ();
2663 d = new_level (gfc_state_stack->head);
2665 d->expr = new_st.expr;
2667 accept_statement (st);
2674 gfc_error ("Duplicate ELSE statements at %L and %C",
2676 reject_statement ();
2681 else_locus = gfc_current_locus;
2683 d = new_level (gfc_state_stack->head);
2686 accept_statement (st);
2694 unexpected_statement (st);
2698 while (st != ST_ENDIF);
2701 accept_statement (st);
2705 /* Parse a SELECT block. */
2708 parse_select_block (void)
2714 accept_statement (ST_SELECT_CASE);
2716 cp = gfc_state_stack->tail;
2717 push_state (&s, COMP_SELECT, gfc_new_block);
2719 /* Make sure that the next statement is a CASE or END SELECT. */
2722 st = next_statement ();
2725 if (st == ST_END_SELECT)
2727 /* Empty SELECT CASE is OK. */
2728 accept_statement (st);
2735 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2738 reject_statement ();
2741 /* At this point, we're got a nonempty select block. */
2742 cp = new_level (cp);
2745 accept_statement (st);
2749 st = parse_executable (ST_NONE);
2756 cp = new_level (gfc_state_stack->head);
2758 gfc_clear_new_st ();
2760 accept_statement (st);
2766 /* Can't have an executable statement because of
2767 parse_executable(). */
2769 unexpected_statement (st);
2773 while (st != ST_END_SELECT);
2776 accept_statement (st);
2780 /* Given a symbol, make sure it is not an iteration variable for a DO
2781 statement. This subroutine is called when the symbol is seen in a
2782 context that causes it to become redefined. If the symbol is an
2783 iterator, we generate an error message and return nonzero. */
2786 gfc_check_do_variable (gfc_symtree *st)
2790 for (s=gfc_state_stack; s; s = s->previous)
2791 if (s->do_variable == st)
2793 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2794 "loop beginning at %L", st->name, &s->head->loc);
2802 /* Checks to see if the current statement label closes an enddo.
2803 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2804 an error) if it incorrectly closes an ENDDO. */
2807 check_do_closure (void)
2811 if (gfc_statement_label == NULL)
2814 for (p = gfc_state_stack; p; p = p->previous)
2815 if (p->state == COMP_DO)
2819 return 0; /* No loops to close */
2821 if (p->ext.end_do_label == gfc_statement_label)
2823 if (p == gfc_state_stack)
2826 gfc_error ("End of nonblock DO statement at %C is within another block");
2830 /* At this point, the label doesn't terminate the innermost loop.
2831 Make sure it doesn't terminate another one. */
2832 for (; p; p = p->previous)
2833 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2835 gfc_error ("End of nonblock DO statement at %C is interwoven "
2836 "with another DO loop");
2844 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2845 handled inside of parse_executable(), because they aren't really
2849 parse_do_block (void)
2856 s.ext.end_do_label = new_st.label;
2858 if (new_st.ext.iterator != NULL)
2859 stree = new_st.ext.iterator->var->symtree;
2863 accept_statement (ST_DO);
2865 top = gfc_state_stack->tail;
2866 push_state (&s, COMP_DO, gfc_new_block);
2868 s.do_variable = stree;
2870 top->block = new_level (top);
2871 top->block->op = EXEC_DO;
2874 st = parse_executable (ST_NONE);
2882 if (s.ext.end_do_label != NULL
2883 && s.ext.end_do_label != gfc_statement_label)
2884 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2887 if (gfc_statement_label != NULL)
2889 new_st.op = EXEC_NOP;
2894 case ST_IMPLIED_ENDDO:
2895 /* If the do-stmt of this DO construct has a do-construct-name,
2896 the corresponding end-do must be an end-do-stmt (with a matching
2897 name, but in that case we must have seen ST_ENDDO first).
2898 We only complain about this in pedantic mode. */
2899 if (gfc_current_block () != NULL)
2900 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2901 &gfc_current_block()->declared_at);
2906 unexpected_statement (st);
2911 accept_statement (st);
2915 /* Parse the statements of OpenMP do/parallel do. */
2917 static gfc_statement
2918 parse_omp_do (gfc_statement omp_st)
2924 accept_statement (omp_st);
2926 cp = gfc_state_stack->tail;
2927 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2928 np = new_level (cp);
2934 st = next_statement ();
2937 else if (st == ST_DO)
2940 unexpected_statement (st);
2944 if (gfc_statement_label != NULL
2945 && gfc_state_stack->previous != NULL
2946 && gfc_state_stack->previous->state == COMP_DO
2947 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2955 there should be no !$OMP END DO. */
2957 return ST_IMPLIED_ENDDO;
2960 check_do_closure ();
2963 st = next_statement ();
2964 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2966 if (new_st.op == EXEC_OMP_END_NOWAIT)
2967 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2969 gcc_assert (new_st.op == EXEC_NOP);
2970 gfc_clear_new_st ();
2971 gfc_commit_symbols ();
2972 gfc_warning_check ();
2973 st = next_statement ();
2979 /* Parse the statements of OpenMP atomic directive. */
2982 parse_omp_atomic (void)
2988 accept_statement (ST_OMP_ATOMIC);
2990 cp = gfc_state_stack->tail;
2991 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2992 np = new_level (cp);
2998 st = next_statement ();
3001 else if (st == ST_ASSIGNMENT)
3004 unexpected_statement (st);
3007 accept_statement (st);
3013 /* Parse the statements of an OpenMP structured block. */
3016 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3018 gfc_statement st, omp_end_st;
3022 accept_statement (omp_st);
3024 cp = gfc_state_stack->tail;
3025 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3026 np = new_level (cp);
3032 case ST_OMP_PARALLEL:
3033 omp_end_st = ST_OMP_END_PARALLEL;
3035 case ST_OMP_PARALLEL_SECTIONS:
3036 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3038 case ST_OMP_SECTIONS:
3039 omp_end_st = ST_OMP_END_SECTIONS;
3041 case ST_OMP_ORDERED:
3042 omp_end_st = ST_OMP_END_ORDERED;
3044 case ST_OMP_CRITICAL:
3045 omp_end_st = ST_OMP_END_CRITICAL;
3048 omp_end_st = ST_OMP_END_MASTER;
3051 omp_end_st = ST_OMP_END_SINGLE;
3054 omp_end_st = ST_OMP_END_TASK;
3056 case ST_OMP_WORKSHARE:
3057 omp_end_st = ST_OMP_END_WORKSHARE;
3059 case ST_OMP_PARALLEL_WORKSHARE:
3060 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3068 if (workshare_stmts_only)
3070 /* Inside of !$omp workshare, only
3073 where statements and constructs
3074 forall statements and constructs
3078 are allowed. For !$omp critical these
3079 restrictions apply recursively. */
3082 st = next_statement ();
3093 accept_statement (st);
3096 case ST_WHERE_BLOCK:
3097 parse_where_block ();
3100 case ST_FORALL_BLOCK:
3101 parse_forall_block ();
3104 case ST_OMP_PARALLEL:
3105 case ST_OMP_PARALLEL_SECTIONS:
3106 parse_omp_structured_block (st, false);
3109 case ST_OMP_PARALLEL_WORKSHARE:
3110 case ST_OMP_CRITICAL:
3111 parse_omp_structured_block (st, true);
3114 case ST_OMP_PARALLEL_DO:
3115 st = parse_omp_do (st);
3119 parse_omp_atomic ();
3130 st = next_statement ();
3134 st = parse_executable (ST_NONE);
3137 else if (st == ST_OMP_SECTION
3138 && (omp_st == ST_OMP_SECTIONS
3139 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3141 np = new_level (np);
3145 else if (st != omp_end_st)
3146 unexpected_statement (st);
3148 while (st != omp_end_st);
3152 case EXEC_OMP_END_NOWAIT:
3153 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3155 case EXEC_OMP_CRITICAL:
3156 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3157 || (new_st.ext.omp_name != NULL
3158 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3159 gfc_error ("Name after !$omp critical and !$omp end critical does "
3161 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3163 case EXEC_OMP_END_SINGLE:
3164 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3165 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3166 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3167 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3175 gfc_clear_new_st ();
3176 gfc_commit_symbols ();
3177 gfc_warning_check ();
3182 /* Accept a series of executable statements. We return the first
3183 statement that doesn't fit to the caller. Any block statements are
3184 passed on to the correct handler, which usually passes the buck
3187 static gfc_statement
3188 parse_executable (gfc_statement st)
3193 st = next_statement ();
3197 close_flag = check_do_closure ();
3202 case ST_END_PROGRAM:
3205 case ST_END_FUNCTION:
3209 case ST_END_SUBROUTINE:
3214 case ST_SELECT_CASE:
3215 gfc_error ("%s statement at %C cannot terminate a non-block "
3216 "DO loop", gfc_ascii_statement (st));
3232 accept_statement (st);
3233 if (close_flag == 1)
3234 return ST_IMPLIED_ENDDO;
3241 case ST_SELECT_CASE:
3242 parse_select_block ();
3247 if (check_do_closure () == 1)
3248 return ST_IMPLIED_ENDDO;
3251 case ST_WHERE_BLOCK:
3252 parse_where_block ();
3255 case ST_FORALL_BLOCK:
3256 parse_forall_block ();
3259 case ST_OMP_PARALLEL:
3260 case ST_OMP_PARALLEL_SECTIONS:
3261 case ST_OMP_SECTIONS:
3262 case ST_OMP_ORDERED:
3263 case ST_OMP_CRITICAL:
3267 parse_omp_structured_block (st, false);
3270 case ST_OMP_WORKSHARE:
3271 case ST_OMP_PARALLEL_WORKSHARE:
3272 parse_omp_structured_block (st, true);
3276 case ST_OMP_PARALLEL_DO:
3277 st = parse_omp_do (st);
3278 if (st == ST_IMPLIED_ENDDO)
3283 parse_omp_atomic ();
3290 st = next_statement ();
3295 /* Parse a series of contained program units. */
3297 static void parse_progunit (gfc_statement);
3300 /* Fix the symbols for sibling functions. These are incorrectly added to
3301 the child namespace as the parser didn't know about this procedure. */
3304 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3308 gfc_symbol *old_sym;
3310 sym->attr.referenced = 1;
3311 for (ns = siblings; ns; ns = ns->sibling)
3313 gfc_find_sym_tree (sym->name, ns, 0, &st);
3315 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3316 goto fixup_contained;
3318 old_sym = st->n.sym;
3319 if (old_sym->ns == ns
3320 && !old_sym->attr.contained
3322 /* By 14.6.1.3, host association should be excluded
3323 for the following. */
3324 && !(old_sym->attr.external
3325 || (old_sym->ts.type != BT_UNKNOWN
3326 && !old_sym->attr.implicit_type)
3327 || old_sym->attr.flavor == FL_PARAMETER
3328 || old_sym->attr.in_common
3329 || old_sym->attr.in_equivalence
3330 || old_sym->attr.data
3331 || old_sym->attr.dummy
3332 || old_sym->attr.result
3333 || old_sym->attr.dimension
3334 || old_sym->attr.allocatable
3335 || old_sym->attr.intrinsic
3336 || old_sym->attr.generic
3337 || old_sym->attr.flavor == FL_NAMELIST
3338 || old_sym->attr.proc == PROC_ST_FUNCTION))
3340 /* Replace it with the symbol from the parent namespace. */
3344 /* Free the old (local) symbol. */
3346 if (old_sym->refs == 0)
3347 gfc_free_symbol (old_sym);
3351 /* Do the same for any contained procedures. */
3352 gfc_fixup_sibling_symbols (sym, ns->contained);
3357 parse_contained (int module)
3359 gfc_namespace *ns, *parent_ns, *tmp;
3360 gfc_state_data s1, s2;
3364 int contains_statements = 0;
3367 push_state (&s1, COMP_CONTAINS, NULL);
3368 parent_ns = gfc_current_ns;
3372 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3374 gfc_current_ns->sibling = parent_ns->contained;
3375 parent_ns->contained = gfc_current_ns;
3378 /* Process the next available statement. We come here if we got an error
3379 and rejected the last statement. */
3380 st = next_statement ();
3389 contains_statements = 1;
3390 accept_statement (st);
3393 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3396 /* For internal procedures, create/update the symbol in the
3397 parent namespace. */
3401 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3402 gfc_error ("Contained procedure '%s' at %C is already "
3403 "ambiguous", gfc_new_block->name);
3406 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3407 &gfc_new_block->declared_at) ==
3410 if (st == ST_FUNCTION)
3411 gfc_add_function (&sym->attr, sym->name,
3412 &gfc_new_block->declared_at);
3414 gfc_add_subroutine (&sym->attr, sym->name,
3415 &gfc_new_block->declared_at);
3419 gfc_commit_symbols ();
3422 sym = gfc_new_block;
3424 /* Mark this as a contained function, so it isn't replaced
3425 by other module functions. */
3426 sym->attr.contained = 1;
3427 sym->attr.referenced = 1;
3429 parse_progunit (ST_NONE);
3431 /* Fix up any sibling functions that refer to this one. */
3432 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3433 /* Or refer to any of its alternate entry points. */
3434 for (el = gfc_current_ns->entries; el; el = el->next)
3435 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3437 gfc_current_ns->code = s2.head;
3438 gfc_current_ns = parent_ns;
3443 /* These statements are associated with the end of the host unit. */
3444 case ST_END_FUNCTION:
3446 case ST_END_PROGRAM:
3447 case ST_END_SUBROUTINE:
3448 accept_statement (st);
3452 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3453 gfc_ascii_statement (st));
3454 reject_statement ();
3460 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3461 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3463 /* The first namespace in the list is guaranteed to not have
3464 anything (worthwhile) in it. */
3465 tmp = gfc_current_ns;
3466 gfc_current_ns = parent_ns;
3467 if (seen_error && tmp->refs > 1)
3468 gfc_free_namespace (tmp);
3470 ns = gfc_current_ns->contained;
3471 gfc_current_ns->contained = ns->sibling;
3472 gfc_free_namespace (ns);
3475 if (!contains_statements)
3476 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3477 "FUNCTION or SUBROUTINE statement at %C");
3481 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3484 parse_progunit (gfc_statement st)
3489 st = parse_spec (st);
3499 accept_statement (st);
3506 if (gfc_current_state () == COMP_FUNCTION)
3507 gfc_check_function_type (gfc_current_ns);
3512 st = parse_executable (st);
3523 accept_statement (st);
3530 unexpected_statement (st);
3531 reject_statement ();
3532 st = next_statement ();
3538 for (p = gfc_state_stack; p; p = p->previous)
3539 if (p->state == COMP_CONTAINS)
3542 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3547 gfc_error ("CONTAINS statement at %C is already in a contained "
3549 st = next_statement ();
3553 parse_contained (0);
3556 gfc_current_ns->code = gfc_state_stack->head;
3560 /* Come here to complain about a global symbol already in use as
3564 gfc_global_used (gfc_gsymbol *sym, locus *where)
3569 where = &gfc_current_locus;
3579 case GSYM_SUBROUTINE:
3580 name = "SUBROUTINE";
3585 case GSYM_BLOCK_DATA:
3586 name = "BLOCK DATA";
3592 gfc_internal_error ("gfc_global_used(): Bad type");
3596 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3597 sym->name, where, name, &sym->where);
3601 /* Parse a block data program unit. */
3604 parse_block_data (void)
3607 static locus blank_locus;
3608 static int blank_block=0;
3611 gfc_current_ns->proc_name = gfc_new_block;
3612 gfc_current_ns->is_block_data = 1;
3614 if (gfc_new_block == NULL)
3617 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3618 "prior BLOCK DATA at %L", &blank_locus);
3622 blank_locus = gfc_current_locus;
3627 s = gfc_get_gsymbol (gfc_new_block->name);
3629 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3630 gfc_global_used(s, NULL);
3633 s->type = GSYM_BLOCK_DATA;
3634 s->where = gfc_current_locus;
3639 st = parse_spec (ST_NONE);
3641 while (st != ST_END_BLOCK_DATA)
3643 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3644 gfc_ascii_statement (st));
3645 reject_statement ();
3646 st = next_statement ();
3651 /* Parse a module subprogram. */
3659 s = gfc_get_gsymbol (gfc_new_block->name);
3660 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3661 gfc_global_used(s, NULL);
3664 s->type = GSYM_MODULE;
3665 s->where = gfc_current_locus;
3669 st = parse_spec (ST_NONE);
3678 parse_contained (1);
3682 accept_statement (st);
3686 gfc_error ("Unexpected %s statement in MODULE at %C",
3687 gfc_ascii_statement (st));
3689 reject_statement ();
3690 st = next_statement ();
3696 /* Add a procedure name to the global symbol table. */
3699 add_global_procedure (int sub)
3703 s = gfc_get_gsymbol(gfc_new_block->name);
3706 || (s->type != GSYM_UNKNOWN
3707 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3708 gfc_global_used(s, NULL);
3711 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3712 s->where = gfc_current_locus;
3714 s->ns = gfc_current_ns;
3719 /* Add a program to the global symbol table. */
3722 add_global_program (void)
3726 if (gfc_new_block == NULL)
3728 s = gfc_get_gsymbol (gfc_new_block->name);
3730 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3731 gfc_global_used(s, NULL);
3734 s->type = GSYM_PROGRAM;
3735 s->where = gfc_current_locus;
3737 s->ns = gfc_current_ns;
3742 /* Top level parser. */
3745 gfc_parse_file (void)
3747 int seen_program, errors_before, errors;
3748 gfc_state_data top, s;
3751 gfc_namespace *next;
3753 gfc_start_source_files ();
3755 top.state = COMP_NONE;
3757 top.previous = NULL;
3758 top.head = top.tail = NULL;
3759 top.do_variable = NULL;
3761 gfc_state_stack = ⊤
3763 gfc_clear_new_st ();
3765 gfc_statement_label = NULL;
3767 if (setjmp (eof_buf))
3768 return FAILURE; /* Come here on unexpected EOF */
3770 /* Prepare the global namespace that will contain the
3772 gfc_global_ns_list = next = NULL;
3776 /* Exit early for empty files. */
3782 st = next_statement ();
3791 goto duplicate_main;
3793 prog_locus = gfc_current_locus;
3795 push_state (&s, COMP_PROGRAM, gfc_new_block);
3796 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3797 accept_statement (st);
3798 add_global_program ();
3799 parse_progunit (ST_NONE);
3800 if (gfc_option.flag_whole_file)
3805 add_global_procedure (1);
3806 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3807 accept_statement (st);
3808 parse_progunit (ST_NONE);
3809 if (gfc_option.flag_whole_file)
3814 add_global_procedure (0);
3815 push_state (&s, COMP_FUNCTION, gfc_new_block);
3816 accept_statement (st);
3817 parse_progunit (ST_NONE);
3818 if (gfc_option.flag_whole_file)
3823 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3824 accept_statement (st);
3825 parse_block_data ();
3829 push_state (&s, COMP_MODULE, gfc_new_block);
3830 accept_statement (st);
3832 gfc_get_errors (NULL, &errors_before);
3836 /* Anything else starts a nameless main program block. */
3839 goto duplicate_main;
3841 prog_locus = gfc_current_locus;
3843 push_state (&s, COMP_PROGRAM, gfc_new_block);
3844 main_program_symbol (gfc_current_ns, "MAIN__");
3845 parse_progunit (st);
3846 if (gfc_option.flag_whole_file)
3851 /* Handle the non-program units. */
3852 gfc_current_ns->code = s.head;
3854 gfc_resolve (gfc_current_ns);
3856 /* Dump the parse tree if requested. */
3857 if (gfc_option.dump_parse_tree)
3858 gfc_dump_parse_tree (gfc_current_ns, stdout);
3860 gfc_get_errors (NULL, &errors);
3861 if (s.state == COMP_MODULE)
3863 gfc_dump_module (s.sym->name, errors_before == errors);
3865 gfc_generate_module_code (gfc_current_ns);
3870 gfc_generate_code (gfc_current_ns);
3878 /* The main program and non-contained procedures are put
3879 in the global namespace list, so that they can be processed
3880 later and all their interfaces resolved. */
3881 gfc_current_ns->code = s.head;
3883 next->sibling = gfc_current_ns;
3885 gfc_global_ns_list = gfc_current_ns;
3887 next = gfc_current_ns;
3894 if (!gfc_option.flag_whole_file)
3897 /* Do the resolution. */
3898 gfc_current_ns = gfc_global_ns_list;
3899 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3901 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3902 gfc_resolve (gfc_current_ns);
3905 /* Do the parse tree dump. */
3906 gfc_current_ns = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
3907 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3909 gfc_dump_parse_tree (gfc_current_ns, stdout);
3910 fputs ("-----------------------------------------\n\n", stdout);
3913 gfc_current_ns = gfc_global_ns_list;
3914 gfc_get_errors (NULL, &errors);
3916 /* Do the translation. This could be in a different order to
3917 resolution if there are forward references in the file. */
3918 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3920 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3921 gfc_generate_code (gfc_current_ns);
3925 gfc_free_dt_list ();
3927 gfc_end_source_files ();
3931 /* If we see a duplicate main program, shut down. If the second
3932 instance is an implied main program, i.e. data decls or executable
3933 statements, we're in for lots of errors. */
3934 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3935 reject_statement ();