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;
1501 new_st.op = EXEC_END_PROCEDURE;
1517 gfc_commit_symbols ();
1518 gfc_warning_check ();
1519 gfc_clear_new_st ();
1523 /* Undo anything tentative that has been built for the current
1527 reject_statement (void)
1529 /* Revert to the previous charlen chain. */
1530 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1531 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1533 gfc_new_block = NULL;
1534 gfc_undo_symbols ();
1535 gfc_clear_warning ();
1536 undo_new_statement ();
1540 /* Generic complaint about an out of order statement. We also do
1541 whatever is necessary to clean up. */
1544 unexpected_statement (gfc_statement st)
1546 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1548 reject_statement ();
1552 /* Given the next statement seen by the matcher, make sure that it is
1553 in proper order with the last. This subroutine is initialized by
1554 calling it with an argument of ST_NONE. If there is a problem, we
1555 issue an error and return FAILURE. Otherwise we return SUCCESS.
1557 Individual parsers need to verify that the statements seen are
1558 valid before calling here, i.e., ENTRY statements are not allowed in
1559 INTERFACE blocks. The following diagram is taken from the standard:
1561 +---------------------------------------+
1562 | program subroutine function module |
1563 +---------------------------------------+
1565 +---------------------------------------+
1567 +---------------------------------------+
1569 | +-----------+------------------+
1570 | | parameter | implicit |
1571 | +-----------+------------------+
1572 | format | | derived type |
1573 | entry | parameter | interface |
1574 | | data | specification |
1575 | | | statement func |
1576 | +-----------+------------------+
1577 | | data | executable |
1578 +--------+-----------+------------------+
1580 +---------------------------------------+
1581 | internal module/subprogram |
1582 +---------------------------------------+
1584 +---------------------------------------+
1593 ORDER_IMPLICIT_NONE,
1601 enum state_order state;
1602 gfc_statement last_statement;
1608 verify_st_order (st_state *p, gfc_statement st, bool silent)
1614 p->state = ORDER_START;
1618 if (p->state > ORDER_USE)
1620 p->state = ORDER_USE;
1624 if (p->state > ORDER_IMPORT)
1626 p->state = ORDER_IMPORT;
1629 case ST_IMPLICIT_NONE:
1630 if (p->state > ORDER_IMPLICIT_NONE)
1633 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1634 statement disqualifies a USE but not an IMPLICIT NONE.
1635 Duplicate IMPLICIT NONEs are caught when the implicit types
1638 p->state = ORDER_IMPLICIT_NONE;
1642 if (p->state > ORDER_IMPLICIT)
1644 p->state = ORDER_IMPLICIT;
1649 if (p->state < ORDER_IMPLICIT_NONE)
1650 p->state = ORDER_IMPLICIT_NONE;
1654 if (p->state >= ORDER_EXEC)
1656 if (p->state < ORDER_IMPLICIT)
1657 p->state = ORDER_IMPLICIT;
1661 if (p->state < ORDER_SPEC)
1662 p->state = ORDER_SPEC;
1667 case ST_DERIVED_DECL:
1669 if (p->state >= ORDER_EXEC)
1671 if (p->state < ORDER_SPEC)
1672 p->state = ORDER_SPEC;
1677 if (p->state < ORDER_EXEC)
1678 p->state = ORDER_EXEC;
1682 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1683 gfc_ascii_statement (st));
1686 /* All is well, record the statement in case we need it next time. */
1687 p->where = gfc_current_locus;
1688 p->last_statement = st;
1693 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1694 gfc_ascii_statement (st),
1695 gfc_ascii_statement (p->last_statement), &p->where);
1701 /* Handle an unexpected end of file. This is a show-stopper... */
1703 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1706 unexpected_eof (void)
1710 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1712 /* Memory cleanup. Move to "second to last". */
1713 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1716 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1719 longjmp (eof_buf, 1);
1723 /* Parse the CONTAINS section of a derived type definition. */
1725 gfc_access gfc_typebound_default_access;
1728 parse_derived_contains (void)
1731 bool seen_private = false;
1732 bool seen_comps = false;
1733 bool error_flag = false;
1736 gcc_assert (gfc_current_state () == COMP_DERIVED);
1737 gcc_assert (gfc_current_block ());
1739 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1741 if (gfc_current_block ()->attr.sequence)
1742 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1743 " section at %C", gfc_current_block ()->name);
1744 if (gfc_current_block ()->attr.is_bind_c)
1745 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1746 " section at %C", gfc_current_block ()->name);
1748 accept_statement (ST_CONTAINS);
1749 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1751 gfc_typebound_default_access = ACCESS_PUBLIC;
1757 st = next_statement ();
1765 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1770 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1771 " procedure at %C") == FAILURE)
1774 accept_statement (ST_PROCEDURE);
1779 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1780 " at %C") == FAILURE)
1783 accept_statement (ST_GENERIC);
1788 if (gfc_notify_std (GFC_STD_F2003,
1789 "Fortran 2003: FINAL procedure declaration"
1790 " at %C") == FAILURE)
1793 accept_statement (ST_FINAL);
1801 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1802 "definition at %C with empty CONTAINS "
1803 "section") == FAILURE))
1806 /* ST_END_TYPE is accepted by parse_derived after return. */
1810 if (gfc_find_state (COMP_MODULE) == FAILURE)
1812 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1820 gfc_error ("PRIVATE statement at %C must precede procedure"
1828 gfc_error ("Duplicate PRIVATE statement at %C");
1832 accept_statement (ST_PRIVATE);
1833 gfc_typebound_default_access = ACCESS_PRIVATE;
1834 seen_private = true;
1838 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1843 gfc_error ("Already inside a CONTAINS block at %C");
1848 unexpected_statement (st);
1854 gcc_assert (gfc_current_state () == COMP_DERIVED);
1860 /* Parse a derived type. */
1863 parse_derived (void)
1865 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1868 gfc_symbol *derived_sym = NULL;
1874 accept_statement (ST_DERIVED_DECL);
1875 push_state (&s, COMP_DERIVED, gfc_new_block);
1877 gfc_new_block->component_access = ACCESS_PUBLIC;
1884 while (compiling_type)
1886 st = next_statement ();
1894 accept_statement (st);
1899 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1908 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1909 "definition at %C without components")
1913 accept_statement (ST_END_TYPE);
1917 if (gfc_find_state (COMP_MODULE) == FAILURE)
1919 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1927 gfc_error ("PRIVATE statement at %C must precede "
1928 "structure components");
1935 gfc_error ("Duplicate PRIVATE statement at %C");
1939 s.sym->component_access = ACCESS_PRIVATE;
1941 accept_statement (ST_PRIVATE);
1948 gfc_error ("SEQUENCE statement at %C must precede "
1949 "structure components");
1954 if (gfc_current_block ()->attr.sequence)
1955 gfc_warning ("SEQUENCE attribute at %C already specified in "
1960 gfc_error ("Duplicate SEQUENCE statement at %C");
1965 gfc_add_sequence (&gfc_current_block ()->attr,
1966 gfc_current_block ()->name, NULL);
1970 if (gfc_notify_std (GFC_STD_F2003,
1971 "Fortran 2003: CONTAINS block in derived type"
1972 " definition at %C") == FAILURE)
1975 accept_statement (ST_CONTAINS);
1976 if (parse_derived_contains ())
1981 unexpected_statement (st);
1986 /* need to verify that all fields of the derived type are
1987 * interoperable with C if the type is declared to be bind(c)
1989 derived_sym = gfc_current_block();
1991 sym = gfc_current_block ();
1992 for (c = sym->components; c; c = c->next)
1994 /* Look for allocatable components. */
1995 if (c->attr.allocatable
1996 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1997 sym->attr.alloc_comp = 1;
1999 /* Look for pointer components. */
2001 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
2002 sym->attr.pointer_comp = 1;
2004 /* Look for procedure pointer components. */
2005 if (c->attr.proc_pointer
2006 || (c->ts.type == BT_DERIVED
2007 && c->ts.derived->attr.proc_pointer_comp))
2008 sym->attr.proc_pointer_comp = 1;
2010 /* Look for private components. */
2011 if (sym->component_access == ACCESS_PRIVATE
2012 || c->attr.access == ACCESS_PRIVATE
2013 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
2014 sym->attr.private_comp = 1;
2017 if (!seen_component)
2018 sym->attr.zero_comp = 1;
2024 /* Parse an ENUM. */
2033 int seen_enumerator = 0;
2037 push_state (&s, COMP_ENUM, gfc_new_block);
2041 while (compiling_enum)
2043 st = next_statement ();
2051 seen_enumerator = 1;
2052 accept_statement (st);
2057 if (!seen_enumerator)
2059 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2062 accept_statement (st);
2066 gfc_free_enum_history ();
2067 unexpected_statement (st);
2075 /* Parse an interface. We must be able to deal with the possibility
2076 of recursive interfaces. The parse_spec() subroutine is mutually
2077 recursive with parse_interface(). */
2079 static gfc_statement parse_spec (gfc_statement);
2082 parse_interface (void)
2084 gfc_compile_state new_state = COMP_NONE, current_state;
2085 gfc_symbol *prog_unit, *sym;
2086 gfc_interface_info save;
2087 gfc_state_data s1, s2;
2091 accept_statement (ST_INTERFACE);
2093 current_interface.ns = gfc_current_ns;
2094 save = current_interface;
2096 sym = (current_interface.type == INTERFACE_GENERIC
2097 || current_interface.type == INTERFACE_USER_OP)
2098 ? gfc_new_block : NULL;
2100 push_state (&s1, COMP_INTERFACE, sym);
2101 current_state = COMP_NONE;
2104 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2106 st = next_statement ();
2114 if (st == ST_SUBROUTINE)
2115 new_state = COMP_SUBROUTINE;
2116 else if (st == ST_FUNCTION)
2117 new_state = COMP_FUNCTION;
2118 if (gfc_new_block->attr.pointer)
2120 gfc_new_block->attr.pointer = 0;
2121 gfc_new_block->attr.proc_pointer = 1;
2123 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2124 gfc_new_block->formal, NULL) == FAILURE)
2126 reject_statement ();
2127 gfc_free_namespace (gfc_current_ns);
2133 case ST_MODULE_PROC: /* The module procedure matcher makes
2134 sure the context is correct. */
2135 accept_statement (st);
2136 gfc_free_namespace (gfc_current_ns);
2139 case ST_END_INTERFACE:
2140 gfc_free_namespace (gfc_current_ns);
2141 gfc_current_ns = current_interface.ns;
2145 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2146 gfc_ascii_statement (st));
2147 reject_statement ();
2148 gfc_free_namespace (gfc_current_ns);
2153 /* Make sure that a generic interface has only subroutines or
2154 functions and that the generic name has the right attribute. */
2155 if (current_interface.type == INTERFACE_GENERIC)
2157 if (current_state == COMP_NONE)
2159 if (new_state == COMP_FUNCTION)
2160 gfc_add_function (&sym->attr, sym->name, NULL);
2161 else if (new_state == COMP_SUBROUTINE)
2162 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2164 current_state = new_state;
2168 if (new_state != current_state)
2170 if (new_state == COMP_SUBROUTINE)
2171 gfc_error ("SUBROUTINE at %C does not belong in a "
2172 "generic function interface");
2174 if (new_state == COMP_FUNCTION)
2175 gfc_error ("FUNCTION at %C does not belong in a "
2176 "generic subroutine interface");
2181 if (current_interface.type == INTERFACE_ABSTRACT)
2183 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2184 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2185 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2186 "cannot be the same as an intrinsic type",
2187 gfc_new_block->name);
2190 push_state (&s2, new_state, gfc_new_block);
2191 accept_statement (st);
2192 prog_unit = gfc_new_block;
2193 prog_unit->formal_ns = gfc_current_ns;
2194 proc_locus = gfc_current_locus;
2197 /* Read data declaration statements. */
2198 st = parse_spec (ST_NONE);
2200 /* Since the interface block does not permit an IMPLICIT statement,
2201 the default type for the function or the result must be taken
2202 from the formal namespace. */
2203 if (new_state == COMP_FUNCTION)
2205 if (prog_unit->result == prog_unit
2206 && prog_unit->ts.type == BT_UNKNOWN)
2207 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2208 else if (prog_unit->result != prog_unit
2209 && prog_unit->result->ts.type == BT_UNKNOWN)
2210 gfc_set_default_type (prog_unit->result, 1,
2211 prog_unit->formal_ns);
2214 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2216 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2217 gfc_ascii_statement (st));
2218 reject_statement ();
2222 /* Add EXTERNAL attribute to function or subroutine. */
2223 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2224 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2226 current_interface = save;
2227 gfc_add_interface (prog_unit);
2230 if (current_interface.ns
2231 && current_interface.ns->proc_name
2232 && strcmp (current_interface.ns->proc_name->name,
2233 prog_unit->name) == 0)
2234 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2235 "enclosing procedure", prog_unit->name, &proc_locus);
2244 /* Associate function characteristics by going back to the function
2245 declaration and rematching the prefix. */
2248 match_deferred_characteristics (gfc_typespec * ts)
2251 match m = MATCH_ERROR;
2252 char name[GFC_MAX_SYMBOL_LEN + 1];
2254 loc = gfc_current_locus;
2256 gfc_current_locus = gfc_current_block ()->declared_at;
2259 gfc_buffer_error (1);
2260 m = gfc_match_prefix (ts);
2261 gfc_buffer_error (0);
2263 if (ts->type == BT_DERIVED)
2267 if (!ts->derived || !ts->derived->components)
2271 /* Only permit one go at the characteristic association. */
2275 /* Set the function locus correctly. If we have not found the
2276 function name, there is an error. */
2278 && gfc_match ("function% %n", name) == MATCH_YES
2279 && strcmp (name, gfc_current_block ()->name) == 0)
2281 gfc_current_block ()->declared_at = gfc_current_locus;
2282 gfc_commit_symbols ();
2287 gfc_current_locus =loc;
2292 /* Check specification-expressions in the function result of the currently
2293 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2294 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2295 scope are not yet parsed so this has to be delayed up to parse_spec. */
2298 check_function_result_typed (void)
2300 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2302 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2303 gcc_assert (ts->type != BT_UNKNOWN);
2305 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2306 /* TODO: Extend when KIND type parameters are implemented. */
2307 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2308 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2312 /* Parse a set of specification statements. Returns the statement
2313 that doesn't fit. */
2315 static gfc_statement
2316 parse_spec (gfc_statement st)
2319 bool function_result_typed = false;
2320 bool bad_characteristic = false;
2323 verify_st_order (&ss, ST_NONE, false);
2325 st = next_statement ();
2327 /* If we are not inside a function or don't have a result specified so far,
2328 do nothing special about it. */
2329 if (gfc_current_state () != COMP_FUNCTION)
2330 function_result_typed = true;
2333 gfc_symbol* proc = gfc_current_ns->proc_name;
2336 if (proc->result->ts.type == BT_UNKNOWN)
2337 function_result_typed = true;
2342 /* If we find a statement that can not be followed by an IMPLICIT statement
2343 (and thus we can expect to see none any further), type the function result
2344 if it has not yet been typed. Be careful not to give the END statement
2345 to verify_st_order! */
2346 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2348 bool verify_now = false;
2350 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2355 verify_st_order (&dummyss, ST_NONE, false);
2356 verify_st_order (&dummyss, st, false);
2358 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2364 check_function_result_typed ();
2365 function_result_typed = true;
2374 case ST_IMPLICIT_NONE:
2376 if (!function_result_typed)
2378 check_function_result_typed ();
2379 function_result_typed = true;
2385 case ST_DATA: /* Not allowed in interfaces */
2386 if (gfc_current_state () == COMP_INTERFACE)
2396 case ST_DERIVED_DECL:
2399 if (verify_st_order (&ss, st, false) == FAILURE)
2401 reject_statement ();
2402 st = next_statement ();
2412 case ST_DERIVED_DECL:
2418 if (gfc_current_state () != COMP_MODULE)
2420 gfc_error ("%s statement must appear in a MODULE",
2421 gfc_ascii_statement (st));
2425 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2427 gfc_error ("%s statement at %C follows another accessibility "
2428 "specification", gfc_ascii_statement (st));
2432 gfc_current_ns->default_access = (st == ST_PUBLIC)
2433 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2437 case ST_STATEMENT_FUNCTION:
2438 if (gfc_current_state () == COMP_MODULE)
2440 unexpected_statement (st);
2448 accept_statement (st);
2449 st = next_statement ();
2453 accept_statement (st);
2455 st = next_statement ();
2458 case ST_GET_FCN_CHARACTERISTICS:
2459 /* This statement triggers the association of a function's result
2461 ts = &gfc_current_block ()->result->ts;
2462 if (match_deferred_characteristics (ts) != MATCH_YES)
2463 bad_characteristic = true;
2465 st = next_statement ();
2472 /* If match_deferred_characteristics failed, then there is an error. */
2473 if (bad_characteristic)
2475 ts = &gfc_current_block ()->result->ts;
2476 if (ts->type != BT_DERIVED)
2477 gfc_error ("Bad kind expression for function '%s' at %L",
2478 gfc_current_block ()->name,
2479 &gfc_current_block ()->declared_at);
2481 gfc_error ("The type for function '%s' at %L is not accessible",
2482 gfc_current_block ()->name,
2483 &gfc_current_block ()->declared_at);
2485 gfc_current_block ()->ts.kind = 0;
2486 /* Keep the derived type; if it's bad, it will be discovered later. */
2487 if (!(ts->type == BT_DERIVED && ts->derived))
2488 ts->type = BT_UNKNOWN;
2495 /* Parse a WHERE block, (not a simple WHERE statement). */
2498 parse_where_block (void)
2500 int seen_empty_else;
2505 accept_statement (ST_WHERE_BLOCK);
2506 top = gfc_state_stack->tail;
2508 push_state (&s, COMP_WHERE, gfc_new_block);
2510 d = add_statement ();
2511 d->expr = top->expr;
2517 seen_empty_else = 0;
2521 st = next_statement ();
2527 case ST_WHERE_BLOCK:
2528 parse_where_block ();
2533 accept_statement (st);
2537 if (seen_empty_else)
2539 gfc_error ("ELSEWHERE statement at %C follows previous "
2540 "unmasked ELSEWHERE");
2544 if (new_st.expr == NULL)
2545 seen_empty_else = 1;
2547 d = new_level (gfc_state_stack->head);
2549 d->expr = new_st.expr;
2551 accept_statement (st);
2556 accept_statement (st);
2560 gfc_error ("Unexpected %s statement in WHERE block at %C",
2561 gfc_ascii_statement (st));
2562 reject_statement ();
2566 while (st != ST_END_WHERE);
2572 /* Parse a FORALL block (not a simple FORALL statement). */
2575 parse_forall_block (void)
2581 accept_statement (ST_FORALL_BLOCK);
2582 top = gfc_state_stack->tail;
2584 push_state (&s, COMP_FORALL, gfc_new_block);
2586 d = add_statement ();
2587 d->op = EXEC_FORALL;
2592 st = next_statement ();
2597 case ST_POINTER_ASSIGNMENT:
2600 accept_statement (st);
2603 case ST_WHERE_BLOCK:
2604 parse_where_block ();
2607 case ST_FORALL_BLOCK:
2608 parse_forall_block ();
2612 accept_statement (st);
2619 gfc_error ("Unexpected %s statement in FORALL block at %C",
2620 gfc_ascii_statement (st));
2622 reject_statement ();
2626 while (st != ST_END_FORALL);
2632 static gfc_statement parse_executable (gfc_statement);
2634 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2637 parse_if_block (void)
2646 accept_statement (ST_IF_BLOCK);
2648 top = gfc_state_stack->tail;
2649 push_state (&s, COMP_IF, gfc_new_block);
2651 new_st.op = EXEC_IF;
2652 d = add_statement ();
2654 d->expr = top->expr;
2660 st = parse_executable (ST_NONE);
2670 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2671 "statement at %L", &else_locus);
2673 reject_statement ();
2677 d = new_level (gfc_state_stack->head);
2679 d->expr = new_st.expr;
2681 accept_statement (st);
2688 gfc_error ("Duplicate ELSE statements at %L and %C",
2690 reject_statement ();
2695 else_locus = gfc_current_locus;
2697 d = new_level (gfc_state_stack->head);
2700 accept_statement (st);
2708 unexpected_statement (st);
2712 while (st != ST_ENDIF);
2715 accept_statement (st);
2719 /* Parse a SELECT block. */
2722 parse_select_block (void)
2728 accept_statement (ST_SELECT_CASE);
2730 cp = gfc_state_stack->tail;
2731 push_state (&s, COMP_SELECT, gfc_new_block);
2733 /* Make sure that the next statement is a CASE or END SELECT. */
2736 st = next_statement ();
2739 if (st == ST_END_SELECT)
2741 /* Empty SELECT CASE is OK. */
2742 accept_statement (st);
2749 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2752 reject_statement ();
2755 /* At this point, we're got a nonempty select block. */
2756 cp = new_level (cp);
2759 accept_statement (st);
2763 st = parse_executable (ST_NONE);
2770 cp = new_level (gfc_state_stack->head);
2772 gfc_clear_new_st ();
2774 accept_statement (st);
2780 /* Can't have an executable statement because of
2781 parse_executable(). */
2783 unexpected_statement (st);
2787 while (st != ST_END_SELECT);
2790 accept_statement (st);
2794 /* Given a symbol, make sure it is not an iteration variable for a DO
2795 statement. This subroutine is called when the symbol is seen in a
2796 context that causes it to become redefined. If the symbol is an
2797 iterator, we generate an error message and return nonzero. */
2800 gfc_check_do_variable (gfc_symtree *st)
2804 for (s=gfc_state_stack; s; s = s->previous)
2805 if (s->do_variable == st)
2807 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2808 "loop beginning at %L", st->name, &s->head->loc);
2816 /* Checks to see if the current statement label closes an enddo.
2817 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2818 an error) if it incorrectly closes an ENDDO. */
2821 check_do_closure (void)
2825 if (gfc_statement_label == NULL)
2828 for (p = gfc_state_stack; p; p = p->previous)
2829 if (p->state == COMP_DO)
2833 return 0; /* No loops to close */
2835 if (p->ext.end_do_label == gfc_statement_label)
2837 if (p == gfc_state_stack)
2840 gfc_error ("End of nonblock DO statement at %C is within another block");
2844 /* At this point, the label doesn't terminate the innermost loop.
2845 Make sure it doesn't terminate another one. */
2846 for (; p; p = p->previous)
2847 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2849 gfc_error ("End of nonblock DO statement at %C is interwoven "
2850 "with another DO loop");
2858 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2859 handled inside of parse_executable(), because they aren't really
2863 parse_do_block (void)
2870 s.ext.end_do_label = new_st.label;
2872 if (new_st.ext.iterator != NULL)
2873 stree = new_st.ext.iterator->var->symtree;
2877 accept_statement (ST_DO);
2879 top = gfc_state_stack->tail;
2880 push_state (&s, COMP_DO, gfc_new_block);
2882 s.do_variable = stree;
2884 top->block = new_level (top);
2885 top->block->op = EXEC_DO;
2888 st = parse_executable (ST_NONE);
2896 if (s.ext.end_do_label != NULL
2897 && s.ext.end_do_label != gfc_statement_label)
2898 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2901 if (gfc_statement_label != NULL)
2903 new_st.op = EXEC_NOP;
2908 case ST_IMPLIED_ENDDO:
2909 /* If the do-stmt of this DO construct has a do-construct-name,
2910 the corresponding end-do must be an end-do-stmt (with a matching
2911 name, but in that case we must have seen ST_ENDDO first).
2912 We only complain about this in pedantic mode. */
2913 if (gfc_current_block () != NULL)
2914 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2915 &gfc_current_block()->declared_at);
2920 unexpected_statement (st);
2925 accept_statement (st);
2929 /* Parse the statements of OpenMP do/parallel do. */
2931 static gfc_statement
2932 parse_omp_do (gfc_statement omp_st)
2938 accept_statement (omp_st);
2940 cp = gfc_state_stack->tail;
2941 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2942 np = new_level (cp);
2948 st = next_statement ();
2951 else if (st == ST_DO)
2954 unexpected_statement (st);
2958 if (gfc_statement_label != NULL
2959 && gfc_state_stack->previous != NULL
2960 && gfc_state_stack->previous->state == COMP_DO
2961 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2969 there should be no !$OMP END DO. */
2971 return ST_IMPLIED_ENDDO;
2974 check_do_closure ();
2977 st = next_statement ();
2978 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2980 if (new_st.op == EXEC_OMP_END_NOWAIT)
2981 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2983 gcc_assert (new_st.op == EXEC_NOP);
2984 gfc_clear_new_st ();
2985 gfc_commit_symbols ();
2986 gfc_warning_check ();
2987 st = next_statement ();
2993 /* Parse the statements of OpenMP atomic directive. */
2996 parse_omp_atomic (void)
3002 accept_statement (ST_OMP_ATOMIC);
3004 cp = gfc_state_stack->tail;
3005 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3006 np = new_level (cp);
3012 st = next_statement ();
3015 else if (st == ST_ASSIGNMENT)
3018 unexpected_statement (st);
3021 accept_statement (st);
3027 /* Parse the statements of an OpenMP structured block. */
3030 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3032 gfc_statement st, omp_end_st;
3036 accept_statement (omp_st);
3038 cp = gfc_state_stack->tail;
3039 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3040 np = new_level (cp);
3046 case ST_OMP_PARALLEL:
3047 omp_end_st = ST_OMP_END_PARALLEL;
3049 case ST_OMP_PARALLEL_SECTIONS:
3050 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3052 case ST_OMP_SECTIONS:
3053 omp_end_st = ST_OMP_END_SECTIONS;
3055 case ST_OMP_ORDERED:
3056 omp_end_st = ST_OMP_END_ORDERED;
3058 case ST_OMP_CRITICAL:
3059 omp_end_st = ST_OMP_END_CRITICAL;
3062 omp_end_st = ST_OMP_END_MASTER;
3065 omp_end_st = ST_OMP_END_SINGLE;
3068 omp_end_st = ST_OMP_END_TASK;
3070 case ST_OMP_WORKSHARE:
3071 omp_end_st = ST_OMP_END_WORKSHARE;
3073 case ST_OMP_PARALLEL_WORKSHARE:
3074 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3082 if (workshare_stmts_only)
3084 /* Inside of !$omp workshare, only
3087 where statements and constructs
3088 forall statements and constructs
3092 are allowed. For !$omp critical these
3093 restrictions apply recursively. */
3096 st = next_statement ();
3107 accept_statement (st);
3110 case ST_WHERE_BLOCK:
3111 parse_where_block ();
3114 case ST_FORALL_BLOCK:
3115 parse_forall_block ();
3118 case ST_OMP_PARALLEL:
3119 case ST_OMP_PARALLEL_SECTIONS:
3120 parse_omp_structured_block (st, false);
3123 case ST_OMP_PARALLEL_WORKSHARE:
3124 case ST_OMP_CRITICAL:
3125 parse_omp_structured_block (st, true);
3128 case ST_OMP_PARALLEL_DO:
3129 st = parse_omp_do (st);
3133 parse_omp_atomic ();
3144 st = next_statement ();
3148 st = parse_executable (ST_NONE);
3151 else if (st == ST_OMP_SECTION
3152 && (omp_st == ST_OMP_SECTIONS
3153 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3155 np = new_level (np);
3159 else if (st != omp_end_st)
3160 unexpected_statement (st);
3162 while (st != omp_end_st);
3166 case EXEC_OMP_END_NOWAIT:
3167 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3169 case EXEC_OMP_CRITICAL:
3170 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3171 || (new_st.ext.omp_name != NULL
3172 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3173 gfc_error ("Name after !$omp critical and !$omp end critical does "
3175 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3177 case EXEC_OMP_END_SINGLE:
3178 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3179 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3180 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3181 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3189 gfc_clear_new_st ();
3190 gfc_commit_symbols ();
3191 gfc_warning_check ();
3196 /* Accept a series of executable statements. We return the first
3197 statement that doesn't fit to the caller. Any block statements are
3198 passed on to the correct handler, which usually passes the buck
3201 static gfc_statement
3202 parse_executable (gfc_statement st)
3207 st = next_statement ();
3211 close_flag = check_do_closure ();
3216 case ST_END_PROGRAM:
3219 case ST_END_FUNCTION:
3223 case ST_END_SUBROUTINE:
3228 case ST_SELECT_CASE:
3229 gfc_error ("%s statement at %C cannot terminate a non-block "
3230 "DO loop", gfc_ascii_statement (st));
3246 accept_statement (st);
3247 if (close_flag == 1)
3248 return ST_IMPLIED_ENDDO;
3255 case ST_SELECT_CASE:
3256 parse_select_block ();
3261 if (check_do_closure () == 1)
3262 return ST_IMPLIED_ENDDO;
3265 case ST_WHERE_BLOCK:
3266 parse_where_block ();
3269 case ST_FORALL_BLOCK:
3270 parse_forall_block ();
3273 case ST_OMP_PARALLEL:
3274 case ST_OMP_PARALLEL_SECTIONS:
3275 case ST_OMP_SECTIONS:
3276 case ST_OMP_ORDERED:
3277 case ST_OMP_CRITICAL:
3281 parse_omp_structured_block (st, false);
3284 case ST_OMP_WORKSHARE:
3285 case ST_OMP_PARALLEL_WORKSHARE:
3286 parse_omp_structured_block (st, true);
3290 case ST_OMP_PARALLEL_DO:
3291 st = parse_omp_do (st);
3292 if (st == ST_IMPLIED_ENDDO)
3297 parse_omp_atomic ();
3304 st = next_statement ();
3309 /* Parse a series of contained program units. */
3311 static void parse_progunit (gfc_statement);
3314 /* Fix the symbols for sibling functions. These are incorrectly added to
3315 the child namespace as the parser didn't know about this procedure. */
3318 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3322 gfc_symbol *old_sym;
3324 sym->attr.referenced = 1;
3325 for (ns = siblings; ns; ns = ns->sibling)
3327 st = gfc_find_symtree (ns->sym_root, sym->name);
3329 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3330 goto fixup_contained;
3332 old_sym = st->n.sym;
3333 if (old_sym->ns == ns
3334 && !old_sym->attr.contained
3336 /* By 14.6.1.3, host association should be excluded
3337 for the following. */
3338 && !(old_sym->attr.external
3339 || (old_sym->ts.type != BT_UNKNOWN
3340 && !old_sym->attr.implicit_type)
3341 || old_sym->attr.flavor == FL_PARAMETER
3342 || old_sym->attr.in_common
3343 || old_sym->attr.in_equivalence
3344 || old_sym->attr.data
3345 || old_sym->attr.dummy
3346 || old_sym->attr.result
3347 || old_sym->attr.dimension
3348 || old_sym->attr.allocatable
3349 || old_sym->attr.intrinsic
3350 || old_sym->attr.generic
3351 || old_sym->attr.flavor == FL_NAMELIST
3352 || old_sym->attr.proc == PROC_ST_FUNCTION))
3354 /* Replace it with the symbol from the parent namespace. */
3358 /* Free the old (local) symbol. */
3360 if (old_sym->refs == 0)
3361 gfc_free_symbol (old_sym);
3365 /* Do the same for any contained procedures. */
3366 gfc_fixup_sibling_symbols (sym, ns->contained);
3371 parse_contained (int module)
3373 gfc_namespace *ns, *parent_ns, *tmp;
3374 gfc_state_data s1, s2;
3378 int contains_statements = 0;
3381 push_state (&s1, COMP_CONTAINS, NULL);
3382 parent_ns = gfc_current_ns;
3386 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3388 gfc_current_ns->sibling = parent_ns->contained;
3389 parent_ns->contained = gfc_current_ns;
3392 /* Process the next available statement. We come here if we got an error
3393 and rejected the last statement. */
3394 st = next_statement ();
3403 contains_statements = 1;
3404 accept_statement (st);
3407 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3410 /* For internal procedures, create/update the symbol in the
3411 parent namespace. */
3415 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3416 gfc_error ("Contained procedure '%s' at %C is already "
3417 "ambiguous", gfc_new_block->name);
3420 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3421 &gfc_new_block->declared_at) ==
3424 if (st == ST_FUNCTION)
3425 gfc_add_function (&sym->attr, sym->name,
3426 &gfc_new_block->declared_at);
3428 gfc_add_subroutine (&sym->attr, sym->name,
3429 &gfc_new_block->declared_at);
3433 gfc_commit_symbols ();
3436 sym = gfc_new_block;
3438 /* Mark this as a contained function, so it isn't replaced
3439 by other module functions. */
3440 sym->attr.contained = 1;
3441 sym->attr.referenced = 1;
3443 parse_progunit (ST_NONE);
3445 /* Fix up any sibling functions that refer to this one. */
3446 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3447 /* Or refer to any of its alternate entry points. */
3448 for (el = gfc_current_ns->entries; el; el = el->next)
3449 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3451 gfc_current_ns->code = s2.head;
3452 gfc_current_ns = parent_ns;
3457 /* These statements are associated with the end of the host unit. */
3458 case ST_END_FUNCTION:
3460 case ST_END_PROGRAM:
3461 case ST_END_SUBROUTINE:
3462 accept_statement (st);
3466 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3467 gfc_ascii_statement (st));
3468 reject_statement ();
3474 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3475 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3477 /* The first namespace in the list is guaranteed to not have
3478 anything (worthwhile) in it. */
3479 tmp = gfc_current_ns;
3480 gfc_current_ns = parent_ns;
3481 if (seen_error && tmp->refs > 1)
3482 gfc_free_namespace (tmp);
3484 ns = gfc_current_ns->contained;
3485 gfc_current_ns->contained = ns->sibling;
3486 gfc_free_namespace (ns);
3489 if (!contains_statements)
3490 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3491 "FUNCTION or SUBROUTINE statement at %C");
3495 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3498 parse_progunit (gfc_statement st)
3503 st = parse_spec (st);
3513 accept_statement (st);
3520 if (gfc_current_state () == COMP_FUNCTION)
3521 gfc_check_function_type (gfc_current_ns);
3526 st = parse_executable (st);
3537 accept_statement (st);
3544 unexpected_statement (st);
3545 reject_statement ();
3546 st = next_statement ();
3552 for (p = gfc_state_stack; p; p = p->previous)
3553 if (p->state == COMP_CONTAINS)
3556 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3561 gfc_error ("CONTAINS statement at %C is already in a contained "
3563 st = next_statement ();
3567 parse_contained (0);
3570 gfc_current_ns->code = gfc_state_stack->head;
3574 /* Come here to complain about a global symbol already in use as
3578 gfc_global_used (gfc_gsymbol *sym, locus *where)
3583 where = &gfc_current_locus;
3593 case GSYM_SUBROUTINE:
3594 name = "SUBROUTINE";
3599 case GSYM_BLOCK_DATA:
3600 name = "BLOCK DATA";
3606 gfc_internal_error ("gfc_global_used(): Bad type");
3610 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3611 sym->name, where, name, &sym->where);
3615 /* Parse a block data program unit. */
3618 parse_block_data (void)
3621 static locus blank_locus;
3622 static int blank_block=0;
3625 gfc_current_ns->proc_name = gfc_new_block;
3626 gfc_current_ns->is_block_data = 1;
3628 if (gfc_new_block == NULL)
3631 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3632 "prior BLOCK DATA at %L", &blank_locus);
3636 blank_locus = gfc_current_locus;
3641 s = gfc_get_gsymbol (gfc_new_block->name);
3643 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3644 gfc_global_used(s, NULL);
3647 s->type = GSYM_BLOCK_DATA;
3648 s->where = gfc_current_locus;
3653 st = parse_spec (ST_NONE);
3655 while (st != ST_END_BLOCK_DATA)
3657 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3658 gfc_ascii_statement (st));
3659 reject_statement ();
3660 st = next_statement ();
3665 /* Parse a module subprogram. */
3673 s = gfc_get_gsymbol (gfc_new_block->name);
3674 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3675 gfc_global_used(s, NULL);
3678 s->type = GSYM_MODULE;
3679 s->where = gfc_current_locus;
3683 st = parse_spec (ST_NONE);
3692 parse_contained (1);
3696 accept_statement (st);
3700 gfc_error ("Unexpected %s statement in MODULE at %C",
3701 gfc_ascii_statement (st));
3703 reject_statement ();
3704 st = next_statement ();
3710 /* Add a procedure name to the global symbol table. */
3713 add_global_procedure (int sub)
3717 s = gfc_get_gsymbol(gfc_new_block->name);
3720 || (s->type != GSYM_UNKNOWN
3721 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3722 gfc_global_used(s, NULL);
3725 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3726 s->where = gfc_current_locus;
3728 s->ns = gfc_current_ns;
3733 /* Add a program to the global symbol table. */
3736 add_global_program (void)
3740 if (gfc_new_block == NULL)
3742 s = gfc_get_gsymbol (gfc_new_block->name);
3744 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3745 gfc_global_used(s, NULL);
3748 s->type = GSYM_PROGRAM;
3749 s->where = gfc_current_locus;
3751 s->ns = gfc_current_ns;
3756 /* Top level parser. */
3759 gfc_parse_file (void)
3761 int seen_program, errors_before, errors;
3762 gfc_state_data top, s;
3765 gfc_namespace *next;
3767 gfc_start_source_files ();
3769 top.state = COMP_NONE;
3771 top.previous = NULL;
3772 top.head = top.tail = NULL;
3773 top.do_variable = NULL;
3775 gfc_state_stack = ⊤
3777 gfc_clear_new_st ();
3779 gfc_statement_label = NULL;
3781 if (setjmp (eof_buf))
3782 return FAILURE; /* Come here on unexpected EOF */
3784 /* Prepare the global namespace that will contain the
3786 gfc_global_ns_list = next = NULL;
3790 /* Exit early for empty files. */
3796 st = next_statement ();
3805 goto duplicate_main;
3807 prog_locus = gfc_current_locus;
3809 push_state (&s, COMP_PROGRAM, gfc_new_block);
3810 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3811 accept_statement (st);
3812 add_global_program ();
3813 parse_progunit (ST_NONE);
3814 if (gfc_option.flag_whole_file)
3819 add_global_procedure (1);
3820 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3821 accept_statement (st);
3822 parse_progunit (ST_NONE);
3823 if (gfc_option.flag_whole_file)
3828 add_global_procedure (0);
3829 push_state (&s, COMP_FUNCTION, gfc_new_block);
3830 accept_statement (st);
3831 parse_progunit (ST_NONE);
3832 if (gfc_option.flag_whole_file)
3837 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3838 accept_statement (st);
3839 parse_block_data ();
3843 push_state (&s, COMP_MODULE, gfc_new_block);
3844 accept_statement (st);
3846 gfc_get_errors (NULL, &errors_before);
3850 /* Anything else starts a nameless main program block. */
3853 goto duplicate_main;
3855 prog_locus = gfc_current_locus;
3857 push_state (&s, COMP_PROGRAM, gfc_new_block);
3858 main_program_symbol (gfc_current_ns, "MAIN__");
3859 parse_progunit (st);
3860 if (gfc_option.flag_whole_file)
3865 /* Handle the non-program units. */
3866 gfc_current_ns->code = s.head;
3868 gfc_resolve (gfc_current_ns);
3870 /* Dump the parse tree if requested. */
3871 if (gfc_option.dump_parse_tree)
3872 gfc_dump_parse_tree (gfc_current_ns, stdout);
3874 gfc_get_errors (NULL, &errors);
3875 if (s.state == COMP_MODULE)
3877 gfc_dump_module (s.sym->name, errors_before == errors);
3879 gfc_generate_module_code (gfc_current_ns);
3884 gfc_generate_code (gfc_current_ns);
3892 /* The main program and non-contained procedures are put
3893 in the global namespace list, so that they can be processed
3894 later and all their interfaces resolved. */
3895 gfc_current_ns->code = s.head;
3897 next->sibling = gfc_current_ns;
3899 gfc_global_ns_list = gfc_current_ns;
3901 next = gfc_current_ns;
3908 if (!gfc_option.flag_whole_file)
3911 /* Do the resolution. */
3912 gfc_current_ns = gfc_global_ns_list;
3913 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3915 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3916 gfc_resolve (gfc_current_ns);
3919 /* Do the parse tree dump. */
3920 gfc_current_ns = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
3921 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3923 gfc_dump_parse_tree (gfc_current_ns, stdout);
3924 fputs ("-----------------------------------------\n\n", stdout);
3927 gfc_current_ns = gfc_global_ns_list;
3928 gfc_get_errors (NULL, &errors);
3930 /* Do the translation. This could be in a different order to
3931 resolution if there are forward references in the file. */
3932 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3934 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3935 gfc_generate_code (gfc_current_ns);
3939 gfc_free_dt_list ();
3941 gfc_end_source_files ();
3945 /* If we see a duplicate main program, shut down. If the second
3946 instance is an implied main program, i.e. data decls or executable
3947 statements, we're in for lots of errors. */
3948 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3949 reject_statement ();