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 +---------------------------------------+
1588 ORDER_IMPLICIT_NONE,
1596 enum state_order state;
1597 gfc_statement last_statement;
1603 verify_st_order (st_state *p, gfc_statement st, bool silent)
1609 p->state = ORDER_START;
1613 if (p->state > ORDER_USE)
1615 p->state = ORDER_USE;
1619 if (p->state > ORDER_IMPORT)
1621 p->state = ORDER_IMPORT;
1624 case ST_IMPLICIT_NONE:
1625 if (p->state > ORDER_IMPLICIT_NONE)
1628 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1629 statement disqualifies a USE but not an IMPLICIT NONE.
1630 Duplicate IMPLICIT NONEs are caught when the implicit types
1633 p->state = ORDER_IMPLICIT_NONE;
1637 if (p->state > ORDER_IMPLICIT)
1639 p->state = ORDER_IMPLICIT;
1644 if (p->state < ORDER_IMPLICIT_NONE)
1645 p->state = ORDER_IMPLICIT_NONE;
1649 if (p->state >= ORDER_EXEC)
1651 if (p->state < ORDER_IMPLICIT)
1652 p->state = ORDER_IMPLICIT;
1656 if (p->state < ORDER_SPEC)
1657 p->state = ORDER_SPEC;
1662 case ST_DERIVED_DECL:
1664 if (p->state >= ORDER_EXEC)
1666 if (p->state < ORDER_SPEC)
1667 p->state = ORDER_SPEC;
1672 if (p->state < ORDER_EXEC)
1673 p->state = ORDER_EXEC;
1677 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1678 gfc_ascii_statement (st));
1681 /* All is well, record the statement in case we need it next time. */
1682 p->where = gfc_current_locus;
1683 p->last_statement = st;
1688 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1689 gfc_ascii_statement (st),
1690 gfc_ascii_statement (p->last_statement), &p->where);
1696 /* Handle an unexpected end of file. This is a show-stopper... */
1698 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1701 unexpected_eof (void)
1705 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1707 /* Memory cleanup. Move to "second to last". */
1708 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1711 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1714 longjmp (eof_buf, 1);
1718 /* Parse the CONTAINS section of a derived type definition. */
1720 gfc_access gfc_typebound_default_access;
1723 parse_derived_contains (void)
1726 bool seen_private = false;
1727 bool seen_comps = false;
1728 bool error_flag = false;
1731 gcc_assert (gfc_current_state () == COMP_DERIVED);
1732 gcc_assert (gfc_current_block ());
1734 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1736 if (gfc_current_block ()->attr.sequence)
1737 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1738 " section at %C", gfc_current_block ()->name);
1739 if (gfc_current_block ()->attr.is_bind_c)
1740 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1741 " section at %C", gfc_current_block ()->name);
1743 accept_statement (ST_CONTAINS);
1744 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1746 gfc_typebound_default_access = ACCESS_PUBLIC;
1752 st = next_statement ();
1760 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1765 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1766 " procedure at %C") == FAILURE)
1769 accept_statement (ST_PROCEDURE);
1774 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1775 " at %C") == FAILURE)
1778 accept_statement (ST_GENERIC);
1783 if (gfc_notify_std (GFC_STD_F2003,
1784 "Fortran 2003: FINAL procedure declaration"
1785 " at %C") == FAILURE)
1788 accept_statement (ST_FINAL);
1796 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1797 "definition at %C with empty CONTAINS "
1798 "section") == FAILURE))
1801 /* ST_END_TYPE is accepted by parse_derived after return. */
1805 if (gfc_find_state (COMP_MODULE) == FAILURE)
1807 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1815 gfc_error ("PRIVATE statement at %C must precede procedure"
1823 gfc_error ("Duplicate PRIVATE statement at %C");
1827 accept_statement (ST_PRIVATE);
1828 gfc_typebound_default_access = ACCESS_PRIVATE;
1829 seen_private = true;
1833 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1838 gfc_error ("Already inside a CONTAINS block at %C");
1843 unexpected_statement (st);
1849 gcc_assert (gfc_current_state () == COMP_DERIVED);
1855 /* Parse a derived type. */
1858 parse_derived (void)
1860 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1863 gfc_symbol *derived_sym = NULL;
1869 accept_statement (ST_DERIVED_DECL);
1870 push_state (&s, COMP_DERIVED, gfc_new_block);
1872 gfc_new_block->component_access = ACCESS_PUBLIC;
1879 while (compiling_type)
1881 st = next_statement ();
1889 accept_statement (st);
1894 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1903 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1904 "definition at %C without components")
1908 accept_statement (ST_END_TYPE);
1912 if (gfc_find_state (COMP_MODULE) == FAILURE)
1914 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1922 gfc_error ("PRIVATE statement at %C must precede "
1923 "structure components");
1930 gfc_error ("Duplicate PRIVATE statement at %C");
1934 s.sym->component_access = ACCESS_PRIVATE;
1936 accept_statement (ST_PRIVATE);
1943 gfc_error ("SEQUENCE statement at %C must precede "
1944 "structure components");
1949 if (gfc_current_block ()->attr.sequence)
1950 gfc_warning ("SEQUENCE attribute at %C already specified in "
1955 gfc_error ("Duplicate SEQUENCE statement at %C");
1960 gfc_add_sequence (&gfc_current_block ()->attr,
1961 gfc_current_block ()->name, NULL);
1965 if (gfc_notify_std (GFC_STD_F2003,
1966 "Fortran 2003: CONTAINS block in derived type"
1967 " definition at %C") == FAILURE)
1970 accept_statement (ST_CONTAINS);
1971 if (parse_derived_contains ())
1976 unexpected_statement (st);
1981 /* need to verify that all fields of the derived type are
1982 * interoperable with C if the type is declared to be bind(c)
1984 derived_sym = gfc_current_block();
1986 sym = gfc_current_block ();
1987 for (c = sym->components; c; c = c->next)
1989 /* Look for allocatable components. */
1990 if (c->attr.allocatable
1991 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1992 sym->attr.alloc_comp = 1;
1994 /* Look for pointer components. */
1996 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1997 sym->attr.pointer_comp = 1;
1999 /* Look for procedure pointer components. */
2000 if (c->attr.proc_pointer
2001 || (c->ts.type == BT_DERIVED
2002 && c->ts.derived->attr.proc_pointer_comp))
2003 sym->attr.proc_pointer_comp = 1;
2005 /* Look for private components. */
2006 if (sym->component_access == ACCESS_PRIVATE
2007 || c->attr.access == ACCESS_PRIVATE
2008 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
2009 sym->attr.private_comp = 1;
2012 if (!seen_component)
2013 sym->attr.zero_comp = 1;
2019 /* Parse an ENUM. */
2028 int seen_enumerator = 0;
2032 push_state (&s, COMP_ENUM, gfc_new_block);
2036 while (compiling_enum)
2038 st = next_statement ();
2046 seen_enumerator = 1;
2047 accept_statement (st);
2052 if (!seen_enumerator)
2054 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2057 accept_statement (st);
2061 gfc_free_enum_history ();
2062 unexpected_statement (st);
2070 /* Parse an interface. We must be able to deal with the possibility
2071 of recursive interfaces. The parse_spec() subroutine is mutually
2072 recursive with parse_interface(). */
2074 static gfc_statement parse_spec (gfc_statement);
2077 parse_interface (void)
2079 gfc_compile_state new_state = COMP_NONE, current_state;
2080 gfc_symbol *prog_unit, *sym;
2081 gfc_interface_info save;
2082 gfc_state_data s1, s2;
2086 accept_statement (ST_INTERFACE);
2088 current_interface.ns = gfc_current_ns;
2089 save = current_interface;
2091 sym = (current_interface.type == INTERFACE_GENERIC
2092 || current_interface.type == INTERFACE_USER_OP)
2093 ? gfc_new_block : NULL;
2095 push_state (&s1, COMP_INTERFACE, sym);
2096 current_state = COMP_NONE;
2099 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2101 st = next_statement ();
2109 if (st == ST_SUBROUTINE)
2110 new_state = COMP_SUBROUTINE;
2111 else if (st == ST_FUNCTION)
2112 new_state = COMP_FUNCTION;
2113 if (gfc_new_block->attr.pointer)
2115 gfc_new_block->attr.pointer = 0;
2116 gfc_new_block->attr.proc_pointer = 1;
2118 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2119 gfc_new_block->formal, NULL) == FAILURE)
2121 reject_statement ();
2122 gfc_free_namespace (gfc_current_ns);
2128 case ST_MODULE_PROC: /* The module procedure matcher makes
2129 sure the context is correct. */
2130 accept_statement (st);
2131 gfc_free_namespace (gfc_current_ns);
2134 case ST_END_INTERFACE:
2135 gfc_free_namespace (gfc_current_ns);
2136 gfc_current_ns = current_interface.ns;
2140 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2141 gfc_ascii_statement (st));
2142 reject_statement ();
2143 gfc_free_namespace (gfc_current_ns);
2148 /* Make sure that a generic interface has only subroutines or
2149 functions and that the generic name has the right attribute. */
2150 if (current_interface.type == INTERFACE_GENERIC)
2152 if (current_state == COMP_NONE)
2154 if (new_state == COMP_FUNCTION)
2155 gfc_add_function (&sym->attr, sym->name, NULL);
2156 else if (new_state == COMP_SUBROUTINE)
2157 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2159 current_state = new_state;
2163 if (new_state != current_state)
2165 if (new_state == COMP_SUBROUTINE)
2166 gfc_error ("SUBROUTINE at %C does not belong in a "
2167 "generic function interface");
2169 if (new_state == COMP_FUNCTION)
2170 gfc_error ("FUNCTION at %C does not belong in a "
2171 "generic subroutine interface");
2176 if (current_interface.type == INTERFACE_ABSTRACT)
2178 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2179 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2180 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2181 "cannot be the same as an intrinsic type",
2182 gfc_new_block->name);
2185 push_state (&s2, new_state, gfc_new_block);
2186 accept_statement (st);
2187 prog_unit = gfc_new_block;
2188 prog_unit->formal_ns = gfc_current_ns;
2189 proc_locus = gfc_current_locus;
2192 /* Read data declaration statements. */
2193 st = parse_spec (ST_NONE);
2195 /* Since the interface block does not permit an IMPLICIT statement,
2196 the default type for the function or the result must be taken
2197 from the formal namespace. */
2198 if (new_state == COMP_FUNCTION)
2200 if (prog_unit->result == prog_unit
2201 && prog_unit->ts.type == BT_UNKNOWN)
2202 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2203 else if (prog_unit->result != prog_unit
2204 && prog_unit->result->ts.type == BT_UNKNOWN)
2205 gfc_set_default_type (prog_unit->result, 1,
2206 prog_unit->formal_ns);
2209 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2211 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2212 gfc_ascii_statement (st));
2213 reject_statement ();
2217 /* Add EXTERNAL attribute to function or subroutine. */
2218 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2219 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2221 current_interface = save;
2222 gfc_add_interface (prog_unit);
2225 if (current_interface.ns
2226 && current_interface.ns->proc_name
2227 && strcmp (current_interface.ns->proc_name->name,
2228 prog_unit->name) == 0)
2229 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2230 "enclosing procedure", prog_unit->name, &proc_locus);
2239 /* Associate function characteristics by going back to the function
2240 declaration and rematching the prefix. */
2243 match_deferred_characteristics (gfc_typespec * ts)
2246 match m = MATCH_ERROR;
2247 char name[GFC_MAX_SYMBOL_LEN + 1];
2249 loc = gfc_current_locus;
2251 gfc_current_locus = gfc_current_block ()->declared_at;
2254 gfc_buffer_error (1);
2255 m = gfc_match_prefix (ts);
2256 gfc_buffer_error (0);
2258 if (ts->type == BT_DERIVED)
2262 if (!ts->derived || !ts->derived->components)
2266 /* Only permit one go at the characteristic association. */
2270 /* Set the function locus correctly. If we have not found the
2271 function name, there is an error. */
2273 && gfc_match ("function% %n", name) == MATCH_YES
2274 && strcmp (name, gfc_current_block ()->name) == 0)
2276 gfc_current_block ()->declared_at = gfc_current_locus;
2277 gfc_commit_symbols ();
2282 gfc_current_locus =loc;
2287 /* Check specification-expressions in the function result of the currently
2288 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2289 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2290 scope are not yet parsed so this has to be delayed up to parse_spec. */
2293 check_function_result_typed (void)
2295 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2297 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2298 gcc_assert (ts->type != BT_UNKNOWN);
2300 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2301 /* TODO: Extend when KIND type parameters are implemented. */
2302 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2303 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2307 /* Parse a set of specification statements. Returns the statement
2308 that doesn't fit. */
2310 static gfc_statement
2311 parse_spec (gfc_statement st)
2314 bool function_result_typed = false;
2315 bool bad_characteristic = false;
2318 verify_st_order (&ss, ST_NONE, false);
2320 st = next_statement ();
2322 /* If we are not inside a function or don't have a result specified so far,
2323 do nothing special about it. */
2324 if (gfc_current_state () != COMP_FUNCTION)
2325 function_result_typed = true;
2328 gfc_symbol* proc = gfc_current_ns->proc_name;
2331 if (proc->result->ts.type == BT_UNKNOWN)
2332 function_result_typed = true;
2337 /* If we find a statement that can not be followed by an IMPLICIT statement
2338 (and thus we can expect to see none any further), type the function result
2339 if it has not yet been typed. Be careful not to give the END statement
2340 to verify_st_order! */
2341 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2343 bool verify_now = false;
2345 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2350 verify_st_order (&dummyss, ST_NONE, false);
2351 verify_st_order (&dummyss, st, false);
2353 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2359 check_function_result_typed ();
2360 function_result_typed = true;
2369 case ST_IMPLICIT_NONE:
2371 if (!function_result_typed)
2373 check_function_result_typed ();
2374 function_result_typed = true;
2380 case ST_DATA: /* Not allowed in interfaces */
2381 if (gfc_current_state () == COMP_INTERFACE)
2391 case ST_DERIVED_DECL:
2394 if (verify_st_order (&ss, st, false) == FAILURE)
2396 reject_statement ();
2397 st = next_statement ();
2407 case ST_DERIVED_DECL:
2413 if (gfc_current_state () != COMP_MODULE)
2415 gfc_error ("%s statement must appear in a MODULE",
2416 gfc_ascii_statement (st));
2420 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2422 gfc_error ("%s statement at %C follows another accessibility "
2423 "specification", gfc_ascii_statement (st));
2427 gfc_current_ns->default_access = (st == ST_PUBLIC)
2428 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2432 case ST_STATEMENT_FUNCTION:
2433 if (gfc_current_state () == COMP_MODULE)
2435 unexpected_statement (st);
2443 accept_statement (st);
2444 st = next_statement ();
2448 accept_statement (st);
2450 st = next_statement ();
2453 case ST_GET_FCN_CHARACTERISTICS:
2454 /* This statement triggers the association of a function's result
2456 ts = &gfc_current_block ()->result->ts;
2457 if (match_deferred_characteristics (ts) != MATCH_YES)
2458 bad_characteristic = true;
2460 st = next_statement ();
2467 /* If match_deferred_characteristics failed, then there is an error. */
2468 if (bad_characteristic)
2470 ts = &gfc_current_block ()->result->ts;
2471 if (ts->type != BT_DERIVED)
2472 gfc_error ("Bad kind expression for function '%s' at %L",
2473 gfc_current_block ()->name,
2474 &gfc_current_block ()->declared_at);
2476 gfc_error ("The type for function '%s' at %L is not accessible",
2477 gfc_current_block ()->name,
2478 &gfc_current_block ()->declared_at);
2480 gfc_current_block ()->ts.kind = 0;
2481 /* Keep the derived type; if it's bad, it will be discovered later. */
2482 if (!(ts->type == BT_DERIVED && ts->derived))
2483 ts->type = BT_UNKNOWN;
2490 /* Parse a WHERE block, (not a simple WHERE statement). */
2493 parse_where_block (void)
2495 int seen_empty_else;
2500 accept_statement (ST_WHERE_BLOCK);
2501 top = gfc_state_stack->tail;
2503 push_state (&s, COMP_WHERE, gfc_new_block);
2505 d = add_statement ();
2506 d->expr = top->expr;
2512 seen_empty_else = 0;
2516 st = next_statement ();
2522 case ST_WHERE_BLOCK:
2523 parse_where_block ();
2528 accept_statement (st);
2532 if (seen_empty_else)
2534 gfc_error ("ELSEWHERE statement at %C follows previous "
2535 "unmasked ELSEWHERE");
2539 if (new_st.expr == NULL)
2540 seen_empty_else = 1;
2542 d = new_level (gfc_state_stack->head);
2544 d->expr = new_st.expr;
2546 accept_statement (st);
2551 accept_statement (st);
2555 gfc_error ("Unexpected %s statement in WHERE block at %C",
2556 gfc_ascii_statement (st));
2557 reject_statement ();
2561 while (st != ST_END_WHERE);
2567 /* Parse a FORALL block (not a simple FORALL statement). */
2570 parse_forall_block (void)
2576 accept_statement (ST_FORALL_BLOCK);
2577 top = gfc_state_stack->tail;
2579 push_state (&s, COMP_FORALL, gfc_new_block);
2581 d = add_statement ();
2582 d->op = EXEC_FORALL;
2587 st = next_statement ();
2592 case ST_POINTER_ASSIGNMENT:
2595 accept_statement (st);
2598 case ST_WHERE_BLOCK:
2599 parse_where_block ();
2602 case ST_FORALL_BLOCK:
2603 parse_forall_block ();
2607 accept_statement (st);
2614 gfc_error ("Unexpected %s statement in FORALL block at %C",
2615 gfc_ascii_statement (st));
2617 reject_statement ();
2621 while (st != ST_END_FORALL);
2627 static gfc_statement parse_executable (gfc_statement);
2629 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2632 parse_if_block (void)
2641 accept_statement (ST_IF_BLOCK);
2643 top = gfc_state_stack->tail;
2644 push_state (&s, COMP_IF, gfc_new_block);
2646 new_st.op = EXEC_IF;
2647 d = add_statement ();
2649 d->expr = top->expr;
2655 st = parse_executable (ST_NONE);
2665 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2666 "statement at %L", &else_locus);
2668 reject_statement ();
2672 d = new_level (gfc_state_stack->head);
2674 d->expr = new_st.expr;
2676 accept_statement (st);
2683 gfc_error ("Duplicate ELSE statements at %L and %C",
2685 reject_statement ();
2690 else_locus = gfc_current_locus;
2692 d = new_level (gfc_state_stack->head);
2695 accept_statement (st);
2703 unexpected_statement (st);
2707 while (st != ST_ENDIF);
2710 accept_statement (st);
2714 /* Parse a SELECT block. */
2717 parse_select_block (void)
2723 accept_statement (ST_SELECT_CASE);
2725 cp = gfc_state_stack->tail;
2726 push_state (&s, COMP_SELECT, gfc_new_block);
2728 /* Make sure that the next statement is a CASE or END SELECT. */
2731 st = next_statement ();
2734 if (st == ST_END_SELECT)
2736 /* Empty SELECT CASE is OK. */
2737 accept_statement (st);
2744 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2747 reject_statement ();
2750 /* At this point, we're got a nonempty select block. */
2751 cp = new_level (cp);
2754 accept_statement (st);
2758 st = parse_executable (ST_NONE);
2765 cp = new_level (gfc_state_stack->head);
2767 gfc_clear_new_st ();
2769 accept_statement (st);
2775 /* Can't have an executable statement because of
2776 parse_executable(). */
2778 unexpected_statement (st);
2782 while (st != ST_END_SELECT);
2785 accept_statement (st);
2789 /* Given a symbol, make sure it is not an iteration variable for a DO
2790 statement. This subroutine is called when the symbol is seen in a
2791 context that causes it to become redefined. If the symbol is an
2792 iterator, we generate an error message and return nonzero. */
2795 gfc_check_do_variable (gfc_symtree *st)
2799 for (s=gfc_state_stack; s; s = s->previous)
2800 if (s->do_variable == st)
2802 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2803 "loop beginning at %L", st->name, &s->head->loc);
2811 /* Checks to see if the current statement label closes an enddo.
2812 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2813 an error) if it incorrectly closes an ENDDO. */
2816 check_do_closure (void)
2820 if (gfc_statement_label == NULL)
2823 for (p = gfc_state_stack; p; p = p->previous)
2824 if (p->state == COMP_DO)
2828 return 0; /* No loops to close */
2830 if (p->ext.end_do_label == gfc_statement_label)
2832 if (p == gfc_state_stack)
2835 gfc_error ("End of nonblock DO statement at %C is within another block");
2839 /* At this point, the label doesn't terminate the innermost loop.
2840 Make sure it doesn't terminate another one. */
2841 for (; p; p = p->previous)
2842 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2844 gfc_error ("End of nonblock DO statement at %C is interwoven "
2845 "with another DO loop");
2853 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2854 handled inside of parse_executable(), because they aren't really
2858 parse_do_block (void)
2865 s.ext.end_do_label = new_st.label;
2867 if (new_st.ext.iterator != NULL)
2868 stree = new_st.ext.iterator->var->symtree;
2872 accept_statement (ST_DO);
2874 top = gfc_state_stack->tail;
2875 push_state (&s, COMP_DO, gfc_new_block);
2877 s.do_variable = stree;
2879 top->block = new_level (top);
2880 top->block->op = EXEC_DO;
2883 st = parse_executable (ST_NONE);
2891 if (s.ext.end_do_label != NULL
2892 && s.ext.end_do_label != gfc_statement_label)
2893 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2896 if (gfc_statement_label != NULL)
2898 new_st.op = EXEC_NOP;
2903 case ST_IMPLIED_ENDDO:
2904 /* If the do-stmt of this DO construct has a do-construct-name,
2905 the corresponding end-do must be an end-do-stmt (with a matching
2906 name, but in that case we must have seen ST_ENDDO first).
2907 We only complain about this in pedantic mode. */
2908 if (gfc_current_block () != NULL)
2909 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2910 &gfc_current_block()->declared_at);
2915 unexpected_statement (st);
2920 accept_statement (st);
2924 /* Parse the statements of OpenMP do/parallel do. */
2926 static gfc_statement
2927 parse_omp_do (gfc_statement omp_st)
2933 accept_statement (omp_st);
2935 cp = gfc_state_stack->tail;
2936 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2937 np = new_level (cp);
2943 st = next_statement ();
2946 else if (st == ST_DO)
2949 unexpected_statement (st);
2953 if (gfc_statement_label != NULL
2954 && gfc_state_stack->previous != NULL
2955 && gfc_state_stack->previous->state == COMP_DO
2956 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2964 there should be no !$OMP END DO. */
2966 return ST_IMPLIED_ENDDO;
2969 check_do_closure ();
2972 st = next_statement ();
2973 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2975 if (new_st.op == EXEC_OMP_END_NOWAIT)
2976 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2978 gcc_assert (new_st.op == EXEC_NOP);
2979 gfc_clear_new_st ();
2980 gfc_commit_symbols ();
2981 gfc_warning_check ();
2982 st = next_statement ();
2988 /* Parse the statements of OpenMP atomic directive. */
2991 parse_omp_atomic (void)
2997 accept_statement (ST_OMP_ATOMIC);
2999 cp = gfc_state_stack->tail;
3000 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3001 np = new_level (cp);
3007 st = next_statement ();
3010 else if (st == ST_ASSIGNMENT)
3013 unexpected_statement (st);
3016 accept_statement (st);
3022 /* Parse the statements of an OpenMP structured block. */
3025 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3027 gfc_statement st, omp_end_st;
3031 accept_statement (omp_st);
3033 cp = gfc_state_stack->tail;
3034 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3035 np = new_level (cp);
3041 case ST_OMP_PARALLEL:
3042 omp_end_st = ST_OMP_END_PARALLEL;
3044 case ST_OMP_PARALLEL_SECTIONS:
3045 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3047 case ST_OMP_SECTIONS:
3048 omp_end_st = ST_OMP_END_SECTIONS;
3050 case ST_OMP_ORDERED:
3051 omp_end_st = ST_OMP_END_ORDERED;
3053 case ST_OMP_CRITICAL:
3054 omp_end_st = ST_OMP_END_CRITICAL;
3057 omp_end_st = ST_OMP_END_MASTER;
3060 omp_end_st = ST_OMP_END_SINGLE;
3063 omp_end_st = ST_OMP_END_TASK;
3065 case ST_OMP_WORKSHARE:
3066 omp_end_st = ST_OMP_END_WORKSHARE;
3068 case ST_OMP_PARALLEL_WORKSHARE:
3069 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3077 if (workshare_stmts_only)
3079 /* Inside of !$omp workshare, only
3082 where statements and constructs
3083 forall statements and constructs
3087 are allowed. For !$omp critical these
3088 restrictions apply recursively. */
3091 st = next_statement ();
3102 accept_statement (st);
3105 case ST_WHERE_BLOCK:
3106 parse_where_block ();
3109 case ST_FORALL_BLOCK:
3110 parse_forall_block ();
3113 case ST_OMP_PARALLEL:
3114 case ST_OMP_PARALLEL_SECTIONS:
3115 parse_omp_structured_block (st, false);
3118 case ST_OMP_PARALLEL_WORKSHARE:
3119 case ST_OMP_CRITICAL:
3120 parse_omp_structured_block (st, true);
3123 case ST_OMP_PARALLEL_DO:
3124 st = parse_omp_do (st);
3128 parse_omp_atomic ();
3139 st = next_statement ();
3143 st = parse_executable (ST_NONE);
3146 else if (st == ST_OMP_SECTION
3147 && (omp_st == ST_OMP_SECTIONS
3148 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3150 np = new_level (np);
3154 else if (st != omp_end_st)
3155 unexpected_statement (st);
3157 while (st != omp_end_st);
3161 case EXEC_OMP_END_NOWAIT:
3162 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3164 case EXEC_OMP_CRITICAL:
3165 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3166 || (new_st.ext.omp_name != NULL
3167 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3168 gfc_error ("Name after !$omp critical and !$omp end critical does "
3170 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3172 case EXEC_OMP_END_SINGLE:
3173 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3174 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3175 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3176 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3184 gfc_clear_new_st ();
3185 gfc_commit_symbols ();
3186 gfc_warning_check ();
3191 /* Accept a series of executable statements. We return the first
3192 statement that doesn't fit to the caller. Any block statements are
3193 passed on to the correct handler, which usually passes the buck
3196 static gfc_statement
3197 parse_executable (gfc_statement st)
3202 st = next_statement ();
3206 close_flag = check_do_closure ();
3211 case ST_END_PROGRAM:
3214 case ST_END_FUNCTION:
3218 case ST_END_SUBROUTINE:
3223 case ST_SELECT_CASE:
3224 gfc_error ("%s statement at %C cannot terminate a non-block "
3225 "DO loop", gfc_ascii_statement (st));
3241 accept_statement (st);
3242 if (close_flag == 1)
3243 return ST_IMPLIED_ENDDO;
3250 case ST_SELECT_CASE:
3251 parse_select_block ();
3256 if (check_do_closure () == 1)
3257 return ST_IMPLIED_ENDDO;
3260 case ST_WHERE_BLOCK:
3261 parse_where_block ();
3264 case ST_FORALL_BLOCK:
3265 parse_forall_block ();
3268 case ST_OMP_PARALLEL:
3269 case ST_OMP_PARALLEL_SECTIONS:
3270 case ST_OMP_SECTIONS:
3271 case ST_OMP_ORDERED:
3272 case ST_OMP_CRITICAL:
3276 parse_omp_structured_block (st, false);
3279 case ST_OMP_WORKSHARE:
3280 case ST_OMP_PARALLEL_WORKSHARE:
3281 parse_omp_structured_block (st, true);
3285 case ST_OMP_PARALLEL_DO:
3286 st = parse_omp_do (st);
3287 if (st == ST_IMPLIED_ENDDO)
3292 parse_omp_atomic ();
3299 st = next_statement ();
3304 /* Parse a series of contained program units. */
3306 static void parse_progunit (gfc_statement);
3309 /* Fix the symbols for sibling functions. These are incorrectly added to
3310 the child namespace as the parser didn't know about this procedure. */
3313 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3317 gfc_symbol *old_sym;
3319 sym->attr.referenced = 1;
3320 for (ns = siblings; ns; ns = ns->sibling)
3322 st = gfc_find_symtree (ns->sym_root, sym->name);
3324 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3325 goto fixup_contained;
3327 old_sym = st->n.sym;
3328 if (old_sym->ns == ns
3329 && !old_sym->attr.contained
3331 /* By 14.6.1.3, host association should be excluded
3332 for the following. */
3333 && !(old_sym->attr.external
3334 || (old_sym->ts.type != BT_UNKNOWN
3335 && !old_sym->attr.implicit_type)
3336 || old_sym->attr.flavor == FL_PARAMETER
3337 || old_sym->attr.in_common
3338 || old_sym->attr.in_equivalence
3339 || old_sym->attr.data
3340 || old_sym->attr.dummy
3341 || old_sym->attr.result
3342 || old_sym->attr.dimension
3343 || old_sym->attr.allocatable
3344 || old_sym->attr.intrinsic
3345 || old_sym->attr.generic
3346 || old_sym->attr.flavor == FL_NAMELIST
3347 || old_sym->attr.proc == PROC_ST_FUNCTION))
3349 /* Replace it with the symbol from the parent namespace. */
3353 /* Free the old (local) symbol. */
3355 if (old_sym->refs == 0)
3356 gfc_free_symbol (old_sym);
3360 /* Do the same for any contained procedures. */
3361 gfc_fixup_sibling_symbols (sym, ns->contained);
3366 parse_contained (int module)
3368 gfc_namespace *ns, *parent_ns, *tmp;
3369 gfc_state_data s1, s2;
3373 int contains_statements = 0;
3376 push_state (&s1, COMP_CONTAINS, NULL);
3377 parent_ns = gfc_current_ns;
3381 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3383 gfc_current_ns->sibling = parent_ns->contained;
3384 parent_ns->contained = gfc_current_ns;
3387 /* Process the next available statement. We come here if we got an error
3388 and rejected the last statement. */
3389 st = next_statement ();
3398 contains_statements = 1;
3399 accept_statement (st);
3402 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3405 /* For internal procedures, create/update the symbol in the
3406 parent namespace. */
3410 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3411 gfc_error ("Contained procedure '%s' at %C is already "
3412 "ambiguous", gfc_new_block->name);
3415 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3416 &gfc_new_block->declared_at) ==
3419 if (st == ST_FUNCTION)
3420 gfc_add_function (&sym->attr, sym->name,
3421 &gfc_new_block->declared_at);
3423 gfc_add_subroutine (&sym->attr, sym->name,
3424 &gfc_new_block->declared_at);
3428 gfc_commit_symbols ();
3431 sym = gfc_new_block;
3433 /* Mark this as a contained function, so it isn't replaced
3434 by other module functions. */
3435 sym->attr.contained = 1;
3436 sym->attr.referenced = 1;
3438 parse_progunit (ST_NONE);
3440 /* Fix up any sibling functions that refer to this one. */
3441 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3442 /* Or refer to any of its alternate entry points. */
3443 for (el = gfc_current_ns->entries; el; el = el->next)
3444 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3446 gfc_current_ns->code = s2.head;
3447 gfc_current_ns = parent_ns;
3452 /* These statements are associated with the end of the host unit. */
3453 case ST_END_FUNCTION:
3455 case ST_END_PROGRAM:
3456 case ST_END_SUBROUTINE:
3457 accept_statement (st);
3461 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3462 gfc_ascii_statement (st));
3463 reject_statement ();
3469 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3470 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3472 /* The first namespace in the list is guaranteed to not have
3473 anything (worthwhile) in it. */
3474 tmp = gfc_current_ns;
3475 gfc_current_ns = parent_ns;
3476 if (seen_error && tmp->refs > 1)
3477 gfc_free_namespace (tmp);
3479 ns = gfc_current_ns->contained;
3480 gfc_current_ns->contained = ns->sibling;
3481 gfc_free_namespace (ns);
3484 if (!contains_statements)
3485 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3486 "FUNCTION or SUBROUTINE statement at %C");
3490 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3493 parse_progunit (gfc_statement st)
3498 st = parse_spec (st);
3508 accept_statement (st);
3515 if (gfc_current_state () == COMP_FUNCTION)
3516 gfc_check_function_type (gfc_current_ns);
3521 st = parse_executable (st);
3532 accept_statement (st);
3539 unexpected_statement (st);
3540 reject_statement ();
3541 st = next_statement ();
3547 for (p = gfc_state_stack; p; p = p->previous)
3548 if (p->state == COMP_CONTAINS)
3551 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3556 gfc_error ("CONTAINS statement at %C is already in a contained "
3558 st = next_statement ();
3562 parse_contained (0);
3565 gfc_current_ns->code = gfc_state_stack->head;
3569 /* Come here to complain about a global symbol already in use as
3573 gfc_global_used (gfc_gsymbol *sym, locus *where)
3578 where = &gfc_current_locus;
3588 case GSYM_SUBROUTINE:
3589 name = "SUBROUTINE";
3594 case GSYM_BLOCK_DATA:
3595 name = "BLOCK DATA";
3601 gfc_internal_error ("gfc_global_used(): Bad type");
3605 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3606 sym->name, where, name, &sym->where);
3610 /* Parse a block data program unit. */
3613 parse_block_data (void)
3616 static locus blank_locus;
3617 static int blank_block=0;
3620 gfc_current_ns->proc_name = gfc_new_block;
3621 gfc_current_ns->is_block_data = 1;
3623 if (gfc_new_block == NULL)
3626 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3627 "prior BLOCK DATA at %L", &blank_locus);
3631 blank_locus = gfc_current_locus;
3636 s = gfc_get_gsymbol (gfc_new_block->name);
3638 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3639 gfc_global_used(s, NULL);
3642 s->type = GSYM_BLOCK_DATA;
3643 s->where = gfc_current_locus;
3648 st = parse_spec (ST_NONE);
3650 while (st != ST_END_BLOCK_DATA)
3652 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3653 gfc_ascii_statement (st));
3654 reject_statement ();
3655 st = next_statement ();
3660 /* Parse a module subprogram. */
3668 s = gfc_get_gsymbol (gfc_new_block->name);
3669 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3670 gfc_global_used(s, NULL);
3673 s->type = GSYM_MODULE;
3674 s->where = gfc_current_locus;
3678 st = parse_spec (ST_NONE);
3687 parse_contained (1);
3691 accept_statement (st);
3695 gfc_error ("Unexpected %s statement in MODULE at %C",
3696 gfc_ascii_statement (st));
3698 reject_statement ();
3699 st = next_statement ();
3705 /* Add a procedure name to the global symbol table. */
3708 add_global_procedure (int sub)
3712 s = gfc_get_gsymbol(gfc_new_block->name);
3715 || (s->type != GSYM_UNKNOWN
3716 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3717 gfc_global_used(s, NULL);
3720 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3721 s->where = gfc_current_locus;
3723 s->ns = gfc_current_ns;
3728 /* Add a program to the global symbol table. */
3731 add_global_program (void)
3735 if (gfc_new_block == NULL)
3737 s = gfc_get_gsymbol (gfc_new_block->name);
3739 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3740 gfc_global_used(s, NULL);
3743 s->type = GSYM_PROGRAM;
3744 s->where = gfc_current_locus;
3746 s->ns = gfc_current_ns;
3751 /* Top level parser. */
3754 gfc_parse_file (void)
3756 int seen_program, errors_before, errors;
3757 gfc_state_data top, s;
3760 gfc_namespace *next;
3762 gfc_start_source_files ();
3764 top.state = COMP_NONE;
3766 top.previous = NULL;
3767 top.head = top.tail = NULL;
3768 top.do_variable = NULL;
3770 gfc_state_stack = ⊤
3772 gfc_clear_new_st ();
3774 gfc_statement_label = NULL;
3776 if (setjmp (eof_buf))
3777 return FAILURE; /* Come here on unexpected EOF */
3779 /* Prepare the global namespace that will contain the
3781 gfc_global_ns_list = next = NULL;
3785 /* Exit early for empty files. */
3791 st = next_statement ();
3800 goto duplicate_main;
3802 prog_locus = gfc_current_locus;
3804 push_state (&s, COMP_PROGRAM, gfc_new_block);
3805 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3806 accept_statement (st);
3807 add_global_program ();
3808 parse_progunit (ST_NONE);
3809 if (gfc_option.flag_whole_file)
3814 add_global_procedure (1);
3815 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3816 accept_statement (st);
3817 parse_progunit (ST_NONE);
3818 if (gfc_option.flag_whole_file)
3823 add_global_procedure (0);
3824 push_state (&s, COMP_FUNCTION, gfc_new_block);
3825 accept_statement (st);
3826 parse_progunit (ST_NONE);
3827 if (gfc_option.flag_whole_file)
3832 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3833 accept_statement (st);
3834 parse_block_data ();
3838 push_state (&s, COMP_MODULE, gfc_new_block);
3839 accept_statement (st);
3841 gfc_get_errors (NULL, &errors_before);
3845 /* Anything else starts a nameless main program block. */
3848 goto duplicate_main;
3850 prog_locus = gfc_current_locus;
3852 push_state (&s, COMP_PROGRAM, gfc_new_block);
3853 main_program_symbol (gfc_current_ns, "MAIN__");
3854 parse_progunit (st);
3855 if (gfc_option.flag_whole_file)
3860 /* Handle the non-program units. */
3861 gfc_current_ns->code = s.head;
3863 gfc_resolve (gfc_current_ns);
3865 /* Dump the parse tree if requested. */
3866 if (gfc_option.dump_parse_tree)
3867 gfc_dump_parse_tree (gfc_current_ns, stdout);
3869 gfc_get_errors (NULL, &errors);
3870 if (s.state == COMP_MODULE)
3872 gfc_dump_module (s.sym->name, errors_before == errors);
3874 gfc_generate_module_code (gfc_current_ns);
3879 gfc_generate_code (gfc_current_ns);
3887 /* The main program and non-contained procedures are put
3888 in the global namespace list, so that they can be processed
3889 later and all their interfaces resolved. */
3890 gfc_current_ns->code = s.head;
3892 next->sibling = gfc_current_ns;
3894 gfc_global_ns_list = gfc_current_ns;
3896 next = gfc_current_ns;
3903 if (!gfc_option.flag_whole_file)
3906 /* Do the resolution. */
3907 gfc_current_ns = gfc_global_ns_list;
3908 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3910 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3911 gfc_resolve (gfc_current_ns);
3914 /* Do the parse tree dump. */
3915 gfc_current_ns = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
3916 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3918 gfc_dump_parse_tree (gfc_current_ns, stdout);
3919 fputs ("-----------------------------------------\n\n", stdout);
3922 gfc_current_ns = gfc_global_ns_list;
3923 gfc_get_errors (NULL, &errors);
3925 /* Do the translation. This could be in a different order to
3926 resolution if there are forward references in the file. */
3927 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3929 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3930 gfc_generate_code (gfc_current_ns);
3934 gfc_free_dt_list ();
3936 gfc_end_source_files ();
3940 /* If we see a duplicate main program, shut down. If the second
3941 instance is an implied main program, i.e. data decls or executable
3942 statements, we're in for lots of errors. */
3943 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3944 reject_statement ();