2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
31 /* Current statement label. Zero means no statement label. Because new_st
32 can get wiped during statement matching, we have to keep it separate. */
34 gfc_st_label *gfc_statement_label;
36 static locus label_locus;
37 static jmp_buf eof_buf;
39 gfc_state_data *gfc_state_stack;
41 /* TODO: Re-order functions to kill these forward decls. */
42 static void check_statement_label (gfc_statement);
43 static void undo_new_statement (void);
44 static void reject_statement (void);
47 /* A sort of half-matching function. We try to match the word on the
48 input with the passed string. If this succeeds, we call the
49 keyword-dependent matching function that will match the rest of the
50 statement. For single keywords, the matching subroutine is
54 match_word (const char *str, match (*subr) (void), locus *old_locus)
69 gfc_current_locus = *old_locus;
77 /* Figure out what the next statement is, (mostly) regardless of
78 proper ordering. The do...while(0) is there to prevent if/else
81 #define match(keyword, subr, st) \
83 if (match_word(keyword, subr, &old_locus) == MATCH_YES) \
86 undo_new_statement (); \
90 /* This is a specialist version of decode_statement that is used
91 for the specification statements in a function, whose
92 characteristics are deferred into the specification statements.
93 eg.: INTEGER (king = mykind) foo ()
94 USE mymodule, ONLY mykind.....
95 The KIND parameter needs a return after USE or IMPORT, whereas
96 derived type declarations can occur anywhere, up the executable
97 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
98 out of the correct kind of specification statements. */
100 decode_specification_statement (void)
106 if (gfc_match_eos () == MATCH_YES)
109 old_locus = gfc_current_locus;
111 match ("import", gfc_match_import, ST_IMPORT);
112 match ("use", gfc_match_use, ST_USE);
114 if (gfc_current_block ()->ts.type != BT_DERIVED)
117 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
118 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
119 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
121 /* General statement matching: Instead of testing every possible
122 statement, we eliminate most possibilities by peeking at the
125 c = gfc_peek_ascii_char ();
130 match ("abstract% interface", gfc_match_abstract_interface,
135 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
142 match ("data", gfc_match_data, ST_DATA);
143 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
147 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
148 match ("entry% ", gfc_match_entry, ST_ENTRY);
149 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
150 match ("external", gfc_match_external, ST_ATTR_DECL);
154 match ("format", gfc_match_format, ST_FORMAT);
161 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
162 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
163 match ("interface", gfc_match_interface, ST_INTERFACE);
164 match ("intent", gfc_match_intent, ST_ATTR_DECL);
165 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
172 match ("namelist", gfc_match_namelist, ST_NAMELIST);
176 match ("optional", gfc_match_optional, ST_ATTR_DECL);
180 match ("parameter", gfc_match_parameter, ST_PARAMETER);
181 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
182 if (gfc_match_private (&st) == MATCH_YES)
184 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
185 if (gfc_match_public (&st) == MATCH_YES)
187 match ("protected", gfc_match_protected, ST_ATTR_DECL);
194 match ("save", gfc_match_save, ST_ATTR_DECL);
198 match ("target", gfc_match_target, ST_ATTR_DECL);
199 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
206 match ("value", gfc_match_value, ST_ATTR_DECL);
207 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
214 /* This is not a specification statement. See if any of the matchers
215 has stored an error message of some sort. */
219 gfc_buffer_error (0);
220 gfc_current_locus = old_locus;
222 return ST_GET_FCN_CHARACTERISTICS;
226 /* This is the primary 'decode_statement'. */
228 decode_statement (void)
239 gfc_clear_error (); /* Clear any pending errors. */
240 gfc_clear_warning (); /* Clear any pending warnings. */
242 gfc_matching_function = false;
244 if (gfc_match_eos () == MATCH_YES)
247 if (gfc_current_state () == COMP_FUNCTION
248 && gfc_current_block ()->result->ts.kind == -1)
249 return decode_specification_statement ();
251 old_locus = gfc_current_locus;
253 /* Try matching a data declaration or function declaration. The
254 input "REALFUNCTIONA(N)" can mean several things in different
255 contexts, so it (and its relatives) get special treatment. */
257 if (gfc_current_state () == COMP_NONE
258 || gfc_current_state () == COMP_INTERFACE
259 || gfc_current_state () == COMP_CONTAINS)
261 gfc_matching_function = true;
262 m = gfc_match_function_decl ();
265 else if (m == MATCH_ERROR)
269 gfc_current_locus = old_locus;
271 gfc_matching_function = false;
274 /* Match statements whose error messages are meant to be overwritten
275 by something better. */
277 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
278 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
279 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
281 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
282 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
284 /* Try to match a subroutine statement, which has the same optional
285 prefixes that functions can have. */
287 if (gfc_match_subroutine () == MATCH_YES)
288 return ST_SUBROUTINE;
290 gfc_current_locus = old_locus;
292 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
293 might begin with a block label. The match functions for these
294 statements are unusual in that their keyword is not seen before
295 the matcher is called. */
297 if (gfc_match_if (&st) == MATCH_YES)
300 gfc_current_locus = old_locus;
302 if (gfc_match_where (&st) == MATCH_YES)
305 gfc_current_locus = old_locus;
307 if (gfc_match_forall (&st) == MATCH_YES)
310 gfc_current_locus = old_locus;
312 match (NULL, gfc_match_do, ST_DO);
313 match (NULL, gfc_match_select, ST_SELECT_CASE);
315 /* General statement matching: Instead of testing every possible
316 statement, we eliminate most possibilities by peeking at the
319 c = gfc_peek_ascii_char ();
324 match ("abstract% interface", gfc_match_abstract_interface,
326 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
327 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
328 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
332 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
333 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
334 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
338 match ("call", gfc_match_call, ST_CALL);
339 match ("close", gfc_match_close, ST_CLOSE);
340 match ("continue", gfc_match_continue, ST_CONTINUE);
341 match ("cycle", gfc_match_cycle, ST_CYCLE);
342 match ("case", gfc_match_case, ST_CASE);
343 match ("common", gfc_match_common, ST_COMMON);
344 match ("contains", gfc_match_eos, ST_CONTAINS);
348 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
349 match ("data", gfc_match_data, ST_DATA);
350 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
354 match ("end file", gfc_match_endfile, ST_END_FILE);
355 match ("exit", gfc_match_exit, ST_EXIT);
356 match ("else", gfc_match_else, ST_ELSE);
357 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
358 match ("else if", gfc_match_elseif, ST_ELSEIF);
359 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
361 if (gfc_match_end (&st) == MATCH_YES)
364 match ("entry% ", gfc_match_entry, ST_ENTRY);
365 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
366 match ("external", gfc_match_external, ST_ATTR_DECL);
370 match ("final", gfc_match_final_decl, ST_FINAL);
371 match ("flush", gfc_match_flush, ST_FLUSH);
372 match ("format", gfc_match_format, ST_FORMAT);
376 match ("generic", gfc_match_generic, ST_GENERIC);
377 match ("go to", gfc_match_goto, ST_GOTO);
381 match ("inquire", gfc_match_inquire, ST_INQUIRE);
382 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
383 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
384 match ("import", gfc_match_import, ST_IMPORT);
385 match ("interface", gfc_match_interface, ST_INTERFACE);
386 match ("intent", gfc_match_intent, ST_ATTR_DECL);
387 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
391 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
392 match ("module", gfc_match_module, ST_MODULE);
396 match ("nullify", gfc_match_nullify, ST_NULLIFY);
397 match ("namelist", gfc_match_namelist, ST_NAMELIST);
401 match ("open", gfc_match_open, ST_OPEN);
402 match ("optional", gfc_match_optional, ST_ATTR_DECL);
406 match ("print", gfc_match_print, ST_WRITE);
407 match ("parameter", gfc_match_parameter, ST_PARAMETER);
408 match ("pause", gfc_match_pause, ST_PAUSE);
409 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
410 if (gfc_match_private (&st) == MATCH_YES)
412 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
413 match ("program", gfc_match_program, ST_PROGRAM);
414 if (gfc_match_public (&st) == MATCH_YES)
416 match ("protected", gfc_match_protected, ST_ATTR_DECL);
420 match ("read", gfc_match_read, ST_READ);
421 match ("return", gfc_match_return, ST_RETURN);
422 match ("rewind", gfc_match_rewind, ST_REWIND);
426 match ("sequence", gfc_match_eos, ST_SEQUENCE);
427 match ("stop", gfc_match_stop, ST_STOP);
428 match ("save", gfc_match_save, ST_ATTR_DECL);
432 match ("target", gfc_match_target, ST_ATTR_DECL);
433 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
437 match ("use", gfc_match_use, ST_USE);
441 match ("value", gfc_match_value, ST_ATTR_DECL);
442 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
446 match ("wait", gfc_match_wait, ST_WAIT);
447 match ("write", gfc_match_write, ST_WRITE);
451 /* All else has failed, so give up. See if any of the matchers has
452 stored an error message of some sort. */
454 if (gfc_error_check () == 0)
455 gfc_error_now ("Unclassifiable statement at %C");
459 gfc_error_recovery ();
465 decode_omp_directive (void)
474 gfc_clear_error (); /* Clear any pending errors. */
475 gfc_clear_warning (); /* Clear any pending warnings. */
479 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
480 "or ELEMENTAL procedures");
481 gfc_error_recovery ();
485 old_locus = gfc_current_locus;
487 /* General OpenMP directive matching: Instead of testing every possible
488 statement, we eliminate most possibilities by peeking at the
491 c = gfc_peek_ascii_char ();
496 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
499 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
502 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
505 match ("do", gfc_match_omp_do, ST_OMP_DO);
508 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
509 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
510 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
511 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
512 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
513 match ("end parallel sections", gfc_match_omp_eos,
514 ST_OMP_END_PARALLEL_SECTIONS);
515 match ("end parallel workshare", gfc_match_omp_eos,
516 ST_OMP_END_PARALLEL_WORKSHARE);
517 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
518 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
519 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
520 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
521 match ("end workshare", gfc_match_omp_end_nowait,
522 ST_OMP_END_WORKSHARE);
525 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
528 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
531 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
534 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
535 match ("parallel sections", gfc_match_omp_parallel_sections,
536 ST_OMP_PARALLEL_SECTIONS);
537 match ("parallel workshare", gfc_match_omp_parallel_workshare,
538 ST_OMP_PARALLEL_WORKSHARE);
539 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
542 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
543 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
544 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
547 match ("task", gfc_match_omp_task, ST_OMP_TASK);
548 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
549 match ("threadprivate", gfc_match_omp_threadprivate,
550 ST_OMP_THREADPRIVATE);
552 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
556 /* All else has failed, so give up. See if any of the matchers has
557 stored an error message of some sort. */
559 if (gfc_error_check () == 0)
560 gfc_error_now ("Unclassifiable OpenMP directive at %C");
564 gfc_error_recovery ();
572 /* Get the next statement in free form source. */
581 at_bol = gfc_at_bol ();
582 gfc_gobble_whitespace ();
584 c = gfc_peek_ascii_char ();
590 /* Found a statement label? */
591 m = gfc_match_st_label (&gfc_statement_label);
593 d = gfc_peek_ascii_char ();
594 if (m != MATCH_YES || !gfc_is_whitespace (d))
596 gfc_match_small_literal_int (&i, &cnt);
599 gfc_error_now ("Too many digits in statement label at %C");
602 gfc_error_now ("Zero is not a valid statement label at %C");
605 c = gfc_next_ascii_char ();
608 if (!gfc_is_whitespace (c))
609 gfc_error_now ("Non-numeric character in statement label at %C");
615 label_locus = gfc_current_locus;
617 gfc_gobble_whitespace ();
619 if (at_bol && gfc_peek_ascii_char () == ';')
621 gfc_error_now ("Semicolon at %C needs to be preceded by "
623 gfc_next_ascii_char (); /* Eat up the semicolon. */
627 if (gfc_match_eos () == MATCH_YES)
629 gfc_warning_now ("Ignoring statement label in empty statement "
631 gfc_free_st_label (gfc_statement_label);
632 gfc_statement_label = NULL;
639 /* Comments have already been skipped by the time we get here,
640 except for OpenMP directives. */
641 if (gfc_option.flag_openmp)
645 c = gfc_next_ascii_char ();
646 for (i = 0; i < 5; i++, c = gfc_next_ascii_char ())
647 gcc_assert (c == "!$omp"[i]);
649 gcc_assert (c == ' ' || c == '\t');
650 gfc_gobble_whitespace ();
651 return decode_omp_directive ();
655 if (at_bol && c == ';')
657 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
658 gfc_next_ascii_char (); /* Eat up the semicolon. */
662 return decode_statement ();
666 /* Get the next statement in fixed-form source. */
671 int label, digit_flag, i;
676 return decode_statement ();
678 /* Skip past the current label field, parsing a statement label if
679 one is there. This is a weird number parser, since the number is
680 contained within five columns and can have any kind of embedded
681 spaces. We also check for characters that make the rest of the
687 for (i = 0; i < 5; i++)
689 c = gfc_next_char_literal (0);
706 label = label * 10 + ((unsigned char) c - '0');
707 label_locus = gfc_current_locus;
711 /* Comments have already been skipped by the time we get
712 here, except for OpenMP directives. */
714 if (gfc_option.flag_openmp)
716 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
717 gcc_assert ((char) gfc_wide_tolower (c) == "*$omp"[i]);
719 if (c != ' ' && c != '0')
721 gfc_buffer_error (0);
722 gfc_error ("Bad continuation line at %C");
726 return decode_omp_directive ();
730 /* Comments have already been skipped by the time we get
731 here so don't bother checking for them. */
734 gfc_buffer_error (0);
735 gfc_error ("Non-numeric character in statement label at %C");
743 gfc_warning_now ("Zero is not a valid statement label at %C");
746 /* We've found a valid statement label. */
747 gfc_statement_label = gfc_get_st_label (label);
751 /* Since this line starts a statement, it cannot be a continuation
752 of a previous statement. If we see something here besides a
753 space or zero, it must be a bad continuation line. */
755 c = gfc_next_char_literal (0);
759 if (c != ' ' && c != '0')
761 gfc_buffer_error (0);
762 gfc_error ("Bad continuation line at %C");
766 /* Now that we've taken care of the statement label columns, we have
767 to make sure that the first nonblank character is not a '!'. If
768 it is, the rest of the line is a comment. */
772 loc = gfc_current_locus;
773 c = gfc_next_char_literal (0);
775 while (gfc_is_whitespace (c));
779 gfc_current_locus = loc;
783 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
787 if (gfc_match_eos () == MATCH_YES)
790 /* At this point, we've got a nonblank statement to parse. */
791 return decode_statement ();
795 gfc_warning ("Ignoring statement label in empty statement at %C");
801 /* Return the next non-ST_NONE statement to the caller. We also worry
802 about including files and the ends of include files at this stage. */
805 next_statement (void)
809 gfc_new_block = NULL;
811 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
814 gfc_statement_label = NULL;
815 gfc_buffer_error (1);
819 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
820 && gfc_current_locus.lb
821 && gfc_current_locus.lb->truncated)
822 gfc_warning_now ("Line truncated at %C");
827 gfc_skip_comments ();
835 if (gfc_define_undef_line ())
838 old_locus = gfc_current_locus;
840 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
846 gfc_buffer_error (0);
848 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
850 gfc_free_st_label (gfc_statement_label);
851 gfc_statement_label = NULL;
852 gfc_current_locus = old_locus;
856 check_statement_label (st);
862 /****************************** Parser ***********************************/
864 /* The parser subroutines are of type 'try' that fail if the file ends
867 /* Macros that expand to case-labels for various classes of
868 statements. Start with executable statements that directly do
871 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
872 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
873 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
874 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
875 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
876 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
877 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
878 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
879 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
881 /* Statements that mark other executable statements. */
883 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
884 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
885 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
886 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
887 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
888 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
891 /* Declaration statements */
893 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
894 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
895 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
898 /* Block end statements. Errors associated with interchanging these
899 are detected in gfc_match_end(). */
901 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
902 case ST_END_PROGRAM: case ST_END_SUBROUTINE
905 /* Push a new state onto the stack. */
908 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
910 p->state = new_state;
911 p->previous = gfc_state_stack;
913 p->head = p->tail = NULL;
914 p->do_variable = NULL;
919 /* Pop the current state. */
923 gfc_state_stack = gfc_state_stack->previous;
927 /* Try to find the given state in the state stack. */
930 gfc_find_state (gfc_compile_state state)
934 for (p = gfc_state_stack; p; p = p->previous)
935 if (p->state == state)
938 return (p == NULL) ? FAILURE : SUCCESS;
942 /* Starts a new level in the statement list. */
945 new_level (gfc_code *q)
949 p = q->block = gfc_get_code ();
951 gfc_state_stack->head = gfc_state_stack->tail = p;
957 /* Add the current new_st code structure and adds it to the current
958 program unit. As a side-effect, it zeroes the new_st. */
968 p->loc = gfc_current_locus;
970 if (gfc_state_stack->head == NULL)
971 gfc_state_stack->head = p;
973 gfc_state_stack->tail->next = p;
975 while (p->next != NULL)
978 gfc_state_stack->tail = p;
986 /* Frees everything associated with the current statement. */
989 undo_new_statement (void)
991 gfc_free_statements (new_st.block);
992 gfc_free_statements (new_st.next);
993 gfc_free_statement (&new_st);
998 /* If the current statement has a statement label, make sure that it
999 is allowed to, or should have one. */
1002 check_statement_label (gfc_statement st)
1006 if (gfc_statement_label == NULL)
1008 if (st == ST_FORMAT)
1009 gfc_error ("FORMAT statement at %L does not have a statement label",
1016 case ST_END_PROGRAM:
1017 case ST_END_FUNCTION:
1018 case ST_END_SUBROUTINE:
1024 type = ST_LABEL_TARGET;
1028 type = ST_LABEL_FORMAT;
1031 /* Statement labels are not restricted from appearing on a
1032 particular line. However, there are plenty of situations
1033 where the resulting label can't be referenced. */
1036 type = ST_LABEL_BAD_TARGET;
1040 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1042 new_st.here = gfc_statement_label;
1046 /* Figures out what the enclosing program unit is. This will be a
1047 function, subroutine, program, block data or module. */
1050 gfc_enclosing_unit (gfc_compile_state * result)
1054 for (p = gfc_state_stack; p; p = p->previous)
1055 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1056 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1057 || p->state == COMP_PROGRAM)
1066 *result = COMP_PROGRAM;
1071 /* Translate a statement enum to a string. */
1074 gfc_ascii_statement (gfc_statement st)
1080 case ST_ARITHMETIC_IF:
1081 p = _("arithmetic IF");
1087 p = _("attribute declaration");
1117 p = _("data declaration");
1125 case ST_DERIVED_DECL:
1126 p = _("derived type declaration");
1140 case ST_END_BLOCK_DATA:
1141 p = "END BLOCK DATA";
1152 case ST_END_FUNCTION:
1158 case ST_END_INTERFACE:
1159 p = "END INTERFACE";
1164 case ST_END_PROGRAM:
1170 case ST_END_SUBROUTINE:
1171 p = "END SUBROUTINE";
1182 case ST_EQUIVALENCE:
1191 case ST_FORALL_BLOCK: /* Fall through */
1213 case ST_IMPLICIT_NONE:
1214 p = "IMPLICIT NONE";
1216 case ST_IMPLIED_ENDDO:
1217 p = _("implied END DO");
1243 case ST_MODULE_PROC:
1244 p = "MODULE PROCEDURE";
1282 case ST_WHERE_BLOCK: /* Fall through */
1293 p = _("assignment");
1295 case ST_POINTER_ASSIGNMENT:
1296 p = _("pointer assignment");
1298 case ST_SELECT_CASE:
1307 case ST_STATEMENT_FUNCTION:
1308 p = "STATEMENT FUNCTION";
1310 case ST_LABEL_ASSIGNMENT:
1311 p = "LABEL ASSIGNMENT";
1314 p = "ENUM DEFINITION";
1317 p = "ENUMERATOR DEFINITION";
1325 case ST_OMP_BARRIER:
1326 p = "!$OMP BARRIER";
1328 case ST_OMP_CRITICAL:
1329 p = "!$OMP CRITICAL";
1334 case ST_OMP_END_CRITICAL:
1335 p = "!$OMP END CRITICAL";
1340 case ST_OMP_END_MASTER:
1341 p = "!$OMP END MASTER";
1343 case ST_OMP_END_ORDERED:
1344 p = "!$OMP END ORDERED";
1346 case ST_OMP_END_PARALLEL:
1347 p = "!$OMP END PARALLEL";
1349 case ST_OMP_END_PARALLEL_DO:
1350 p = "!$OMP END PARALLEL DO";
1352 case ST_OMP_END_PARALLEL_SECTIONS:
1353 p = "!$OMP END PARALLEL SECTIONS";
1355 case ST_OMP_END_PARALLEL_WORKSHARE:
1356 p = "!$OMP END PARALLEL WORKSHARE";
1358 case ST_OMP_END_SECTIONS:
1359 p = "!$OMP END SECTIONS";
1361 case ST_OMP_END_SINGLE:
1362 p = "!$OMP END SINGLE";
1364 case ST_OMP_END_TASK:
1365 p = "!$OMP END TASK";
1367 case ST_OMP_END_WORKSHARE:
1368 p = "!$OMP END WORKSHARE";
1376 case ST_OMP_ORDERED:
1377 p = "!$OMP ORDERED";
1379 case ST_OMP_PARALLEL:
1380 p = "!$OMP PARALLEL";
1382 case ST_OMP_PARALLEL_DO:
1383 p = "!$OMP PARALLEL DO";
1385 case ST_OMP_PARALLEL_SECTIONS:
1386 p = "!$OMP PARALLEL SECTIONS";
1388 case ST_OMP_PARALLEL_WORKSHARE:
1389 p = "!$OMP PARALLEL WORKSHARE";
1391 case ST_OMP_SECTIONS:
1392 p = "!$OMP SECTIONS";
1394 case ST_OMP_SECTION:
1395 p = "!$OMP SECTION";
1403 case ST_OMP_TASKWAIT:
1404 p = "!$OMP TASKWAIT";
1406 case ST_OMP_THREADPRIVATE:
1407 p = "!$OMP THREADPRIVATE";
1409 case ST_OMP_WORKSHARE:
1410 p = "!$OMP WORKSHARE";
1413 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1420 /* Create a symbol for the main program and assign it to ns->proc_name. */
1423 main_program_symbol (gfc_namespace *ns, const char *name)
1425 gfc_symbol *main_program;
1426 symbol_attribute attr;
1428 gfc_get_symbol (name, ns, &main_program);
1429 gfc_clear_attr (&attr);
1430 attr.flavor = FL_PROGRAM;
1431 attr.proc = PROC_UNKNOWN;
1432 attr.subroutine = 1;
1433 attr.access = ACCESS_PUBLIC;
1434 attr.is_main_program = 1;
1435 main_program->attr = attr;
1436 main_program->declared_at = gfc_current_locus;
1437 ns->proc_name = main_program;
1438 gfc_commit_symbols ();
1442 /* Do whatever is necessary to accept the last statement. */
1445 accept_statement (gfc_statement st)
1453 case ST_IMPLICIT_NONE:
1454 gfc_set_implicit_none ();
1463 gfc_current_ns->proc_name = gfc_new_block;
1466 /* If the statement is the end of a block, lay down a special code
1467 that allows a branch to the end of the block from within the
1468 construct. IF and SELECT are treated differently from DO
1469 (where EXEC_NOP is added inside the loop) for two
1471 1. END DO has a meaning in the sense that after a GOTO to
1472 it, the loop counter must be increased.
1473 2. IF blocks and SELECT blocks can consist of multiple
1474 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1475 Putting the label before the END IF would make the jump
1476 from, say, the ELSE IF block to the END IF illegal. */
1480 if (gfc_statement_label != NULL)
1482 new_st.op = EXEC_END_BLOCK;
1487 /* The end-of-program unit statements do not get the special
1488 marker and require a statement of some sort if they are a
1491 case ST_END_PROGRAM:
1492 case ST_END_FUNCTION:
1493 case ST_END_SUBROUTINE:
1494 if (gfc_statement_label != NULL)
1496 new_st.op = EXEC_RETURN;
1512 gfc_commit_symbols ();
1513 gfc_warning_check ();
1514 gfc_clear_new_st ();
1518 /* Undo anything tentative that has been built for the current
1522 reject_statement (void)
1524 /* Revert to the previous charlen chain. */
1525 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1526 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1528 gfc_new_block = NULL;
1529 gfc_undo_symbols ();
1530 gfc_clear_warning ();
1531 undo_new_statement ();
1535 /* Generic complaint about an out of order statement. We also do
1536 whatever is necessary to clean up. */
1539 unexpected_statement (gfc_statement st)
1541 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1543 reject_statement ();
1547 /* Given the next statement seen by the matcher, make sure that it is
1548 in proper order with the last. This subroutine is initialized by
1549 calling it with an argument of ST_NONE. If there is a problem, we
1550 issue an error and return FAILURE. Otherwise we return SUCCESS.
1552 Individual parsers need to verify that the statements seen are
1553 valid before calling here, i.e., ENTRY statements are not allowed in
1554 INTERFACE blocks. The following diagram is taken from the standard:
1556 +---------------------------------------+
1557 | program subroutine function module |
1558 +---------------------------------------+
1560 +---------------------------------------+
1562 +---------------------------------------+
1564 | +-----------+------------------+
1565 | | parameter | implicit |
1566 | +-----------+------------------+
1567 | format | | derived type |
1568 | entry | parameter | interface |
1569 | | data | specification |
1570 | | | statement func |
1571 | +-----------+------------------+
1572 | | data | executable |
1573 +--------+-----------+------------------+
1575 +---------------------------------------+
1576 | internal module/subprogram |
1577 +---------------------------------------+
1579 +---------------------------------------+
1586 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1587 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1590 gfc_statement last_statement;
1596 verify_st_order (st_state *p, gfc_statement st, bool silent)
1602 p->state = ORDER_START;
1606 if (p->state > ORDER_USE)
1608 p->state = ORDER_USE;
1612 if (p->state > ORDER_IMPORT)
1614 p->state = ORDER_IMPORT;
1617 case ST_IMPLICIT_NONE:
1618 if (p->state > ORDER_IMPLICIT_NONE)
1621 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1622 statement disqualifies a USE but not an IMPLICIT NONE.
1623 Duplicate IMPLICIT NONEs are caught when the implicit types
1626 p->state = ORDER_IMPLICIT_NONE;
1630 if (p->state > ORDER_IMPLICIT)
1632 p->state = ORDER_IMPLICIT;
1637 if (p->state < ORDER_IMPLICIT_NONE)
1638 p->state = ORDER_IMPLICIT_NONE;
1642 if (p->state >= ORDER_EXEC)
1644 if (p->state < ORDER_IMPLICIT)
1645 p->state = ORDER_IMPLICIT;
1649 if (p->state < ORDER_SPEC)
1650 p->state = ORDER_SPEC;
1655 case ST_DERIVED_DECL:
1657 if (p->state >= ORDER_EXEC)
1659 if (p->state < ORDER_SPEC)
1660 p->state = ORDER_SPEC;
1665 if (p->state < ORDER_EXEC)
1666 p->state = ORDER_EXEC;
1670 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1671 gfc_ascii_statement (st));
1674 /* All is well, record the statement in case we need it next time. */
1675 p->where = gfc_current_locus;
1676 p->last_statement = st;
1681 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1682 gfc_ascii_statement (st),
1683 gfc_ascii_statement (p->last_statement), &p->where);
1689 /* Handle an unexpected end of file. This is a show-stopper... */
1691 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1694 unexpected_eof (void)
1698 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1700 /* Memory cleanup. Move to "second to last". */
1701 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1704 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1707 longjmp (eof_buf, 1);
1711 /* Parse the CONTAINS section of a derived type definition. */
1713 gfc_access gfc_typebound_default_access;
1716 parse_derived_contains (void)
1719 bool seen_private = false;
1720 bool seen_comps = false;
1721 bool error_flag = false;
1724 gcc_assert (gfc_current_state () == COMP_DERIVED);
1725 gcc_assert (gfc_current_block ());
1727 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1729 if (gfc_current_block ()->attr.sequence)
1730 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1731 " section at %C", gfc_current_block ()->name);
1732 if (gfc_current_block ()->attr.is_bind_c)
1733 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1734 " section at %C", gfc_current_block ()->name);
1736 accept_statement (ST_CONTAINS);
1737 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1739 gfc_typebound_default_access = ACCESS_PUBLIC;
1745 st = next_statement ();
1753 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1758 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1759 " procedure at %C") == FAILURE)
1762 accept_statement (ST_PROCEDURE);
1767 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1768 " at %C") == FAILURE)
1771 accept_statement (ST_GENERIC);
1776 if (gfc_notify_std (GFC_STD_F2003,
1777 "Fortran 2003: FINAL procedure declaration"
1778 " at %C") == FAILURE)
1781 accept_statement (ST_FINAL);
1789 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1790 "definition at %C with empty CONTAINS "
1791 "section") == FAILURE))
1794 /* ST_END_TYPE is accepted by parse_derived after return. */
1798 if (gfc_find_state (COMP_MODULE) == FAILURE)
1800 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1808 gfc_error ("PRIVATE statement at %C must precede procedure"
1816 gfc_error ("Duplicate PRIVATE statement at %C");
1820 accept_statement (ST_PRIVATE);
1821 gfc_typebound_default_access = ACCESS_PRIVATE;
1822 seen_private = true;
1826 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1831 gfc_error ("Already inside a CONTAINS block at %C");
1836 unexpected_statement (st);
1842 gcc_assert (gfc_current_state () == COMP_DERIVED);
1848 /* Parse a derived type. */
1851 parse_derived (void)
1853 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1856 gfc_symbol *derived_sym = NULL;
1862 accept_statement (ST_DERIVED_DECL);
1863 push_state (&s, COMP_DERIVED, gfc_new_block);
1865 gfc_new_block->component_access = ACCESS_PUBLIC;
1872 while (compiling_type)
1874 st = next_statement ();
1882 accept_statement (st);
1887 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1896 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1897 "definition at %C without components")
1901 accept_statement (ST_END_TYPE);
1905 if (gfc_find_state (COMP_MODULE) == FAILURE)
1907 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1915 gfc_error ("PRIVATE statement at %C must precede "
1916 "structure components");
1923 gfc_error ("Duplicate PRIVATE statement at %C");
1927 s.sym->component_access = ACCESS_PRIVATE;
1929 accept_statement (ST_PRIVATE);
1936 gfc_error ("SEQUENCE statement at %C must precede "
1937 "structure components");
1942 if (gfc_current_block ()->attr.sequence)
1943 gfc_warning ("SEQUENCE attribute at %C already specified in "
1948 gfc_error ("Duplicate SEQUENCE statement at %C");
1953 gfc_add_sequence (&gfc_current_block ()->attr,
1954 gfc_current_block ()->name, NULL);
1958 if (gfc_notify_std (GFC_STD_F2003,
1959 "Fortran 2003: CONTAINS block in derived type"
1960 " definition at %C") == FAILURE)
1963 accept_statement (ST_CONTAINS);
1964 if (parse_derived_contains ())
1969 unexpected_statement (st);
1974 /* need to verify that all fields of the derived type are
1975 * interoperable with C if the type is declared to be bind(c)
1977 derived_sym = gfc_current_block();
1979 sym = gfc_current_block ();
1980 for (c = sym->components; c; c = c->next)
1982 /* Look for allocatable components. */
1983 if (c->attr.allocatable
1984 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1985 sym->attr.alloc_comp = 1;
1987 /* Look for pointer components. */
1989 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1990 sym->attr.pointer_comp = 1;
1992 /* Look for procedure pointer components. */
1993 if (c->attr.proc_pointer
1994 || (c->ts.type == BT_DERIVED
1995 && c->ts.derived->attr.proc_pointer_comp))
1996 sym->attr.proc_pointer_comp = 1;
1998 /* Look for private components. */
1999 if (sym->component_access == ACCESS_PRIVATE
2000 || c->attr.access == ACCESS_PRIVATE
2001 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
2002 sym->attr.private_comp = 1;
2005 if (!seen_component)
2006 sym->attr.zero_comp = 1;
2012 /* Parse an ENUM. */
2021 int seen_enumerator = 0;
2025 push_state (&s, COMP_ENUM, gfc_new_block);
2029 while (compiling_enum)
2031 st = next_statement ();
2039 seen_enumerator = 1;
2040 accept_statement (st);
2045 if (!seen_enumerator)
2047 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2050 accept_statement (st);
2054 gfc_free_enum_history ();
2055 unexpected_statement (st);
2063 /* Parse an interface. We must be able to deal with the possibility
2064 of recursive interfaces. The parse_spec() subroutine is mutually
2065 recursive with parse_interface(). */
2067 static gfc_statement parse_spec (gfc_statement);
2070 parse_interface (void)
2072 gfc_compile_state new_state = COMP_NONE, current_state;
2073 gfc_symbol *prog_unit, *sym;
2074 gfc_interface_info save;
2075 gfc_state_data s1, s2;
2079 accept_statement (ST_INTERFACE);
2081 current_interface.ns = gfc_current_ns;
2082 save = current_interface;
2084 sym = (current_interface.type == INTERFACE_GENERIC
2085 || current_interface.type == INTERFACE_USER_OP)
2086 ? gfc_new_block : NULL;
2088 push_state (&s1, COMP_INTERFACE, sym);
2089 current_state = COMP_NONE;
2092 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2094 st = next_statement ();
2102 if (st == ST_SUBROUTINE)
2103 new_state = COMP_SUBROUTINE;
2104 else if (st == ST_FUNCTION)
2105 new_state = COMP_FUNCTION;
2106 if (gfc_new_block->attr.pointer)
2108 gfc_new_block->attr.pointer = 0;
2109 gfc_new_block->attr.proc_pointer = 1;
2111 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2112 gfc_new_block->formal, NULL) == FAILURE)
2114 reject_statement ();
2115 gfc_free_namespace (gfc_current_ns);
2121 case ST_MODULE_PROC: /* The module procedure matcher makes
2122 sure the context is correct. */
2123 accept_statement (st);
2124 gfc_free_namespace (gfc_current_ns);
2127 case ST_END_INTERFACE:
2128 gfc_free_namespace (gfc_current_ns);
2129 gfc_current_ns = current_interface.ns;
2133 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2134 gfc_ascii_statement (st));
2135 reject_statement ();
2136 gfc_free_namespace (gfc_current_ns);
2141 /* Make sure that a generic interface has only subroutines or
2142 functions and that the generic name has the right attribute. */
2143 if (current_interface.type == INTERFACE_GENERIC)
2145 if (current_state == COMP_NONE)
2147 if (new_state == COMP_FUNCTION)
2148 gfc_add_function (&sym->attr, sym->name, NULL);
2149 else if (new_state == COMP_SUBROUTINE)
2150 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2152 current_state = new_state;
2156 if (new_state != current_state)
2158 if (new_state == COMP_SUBROUTINE)
2159 gfc_error ("SUBROUTINE at %C does not belong in a "
2160 "generic function interface");
2162 if (new_state == COMP_FUNCTION)
2163 gfc_error ("FUNCTION at %C does not belong in a "
2164 "generic subroutine interface");
2169 if (current_interface.type == INTERFACE_ABSTRACT)
2171 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2172 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2173 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2174 "cannot be the same as an intrinsic type",
2175 gfc_new_block->name);
2178 push_state (&s2, new_state, gfc_new_block);
2179 accept_statement (st);
2180 prog_unit = gfc_new_block;
2181 prog_unit->formal_ns = gfc_current_ns;
2182 proc_locus = gfc_current_locus;
2185 /* Read data declaration statements. */
2186 st = parse_spec (ST_NONE);
2188 /* Since the interface block does not permit an IMPLICIT statement,
2189 the default type for the function or the result must be taken
2190 from the formal namespace. */
2191 if (new_state == COMP_FUNCTION)
2193 if (prog_unit->result == prog_unit
2194 && prog_unit->ts.type == BT_UNKNOWN)
2195 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2196 else if (prog_unit->result != prog_unit
2197 && prog_unit->result->ts.type == BT_UNKNOWN)
2198 gfc_set_default_type (prog_unit->result, 1,
2199 prog_unit->formal_ns);
2202 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2204 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2205 gfc_ascii_statement (st));
2206 reject_statement ();
2210 /* Add EXTERNAL attribute to function or subroutine. */
2211 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2212 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2214 current_interface = save;
2215 gfc_add_interface (prog_unit);
2218 if (current_interface.ns
2219 && current_interface.ns->proc_name
2220 && strcmp (current_interface.ns->proc_name->name,
2221 prog_unit->name) == 0)
2222 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2223 "enclosing procedure", prog_unit->name, &proc_locus);
2232 /* Associate function characteristics by going back to the function
2233 declaration and rematching the prefix. */
2236 match_deferred_characteristics (gfc_typespec * ts)
2239 match m = MATCH_ERROR;
2240 char name[GFC_MAX_SYMBOL_LEN + 1];
2242 loc = gfc_current_locus;
2244 gfc_current_locus = gfc_current_block ()->declared_at;
2247 gfc_buffer_error (1);
2248 m = gfc_match_prefix (ts);
2249 gfc_buffer_error (0);
2251 if (ts->type == BT_DERIVED)
2255 if (!ts->derived || !ts->derived->components)
2259 /* Only permit one go at the characteristic association. */
2263 /* Set the function locus correctly. If we have not found the
2264 function name, there is an error. */
2266 && gfc_match ("function% %n", name) == MATCH_YES
2267 && strcmp (name, gfc_current_block ()->name) == 0)
2269 gfc_current_block ()->declared_at = gfc_current_locus;
2270 gfc_commit_symbols ();
2275 gfc_current_locus =loc;
2280 /* Check specification-expressions in the function result of the currently
2281 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2282 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2283 scope are not yet parsed so this has to be delayed up to parse_spec. */
2286 check_function_result_typed (void)
2288 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2290 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2291 gcc_assert (ts->type != BT_UNKNOWN);
2293 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2294 /* TODO: Extend when KIND type parameters are implemented. */
2295 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2296 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2300 /* Parse a set of specification statements. Returns the statement
2301 that doesn't fit. */
2303 static gfc_statement
2304 parse_spec (gfc_statement st)
2307 bool function_result_typed = false;
2308 bool bad_characteristic = false;
2311 verify_st_order (&ss, ST_NONE, false);
2313 st = next_statement ();
2315 /* If we are not inside a function or don't have a result specified so far,
2316 do nothing special about it. */
2317 if (gfc_current_state () != COMP_FUNCTION)
2318 function_result_typed = true;
2321 gfc_symbol* proc = gfc_current_ns->proc_name;
2324 if (proc->result->ts.type == BT_UNKNOWN)
2325 function_result_typed = true;
2330 /* If we find a statement that can not be followed by an IMPLICIT statement
2331 (and thus we can expect to see none any further), type the function result
2332 if it has not yet been typed. Be careful not to give the END statement
2333 to verify_st_order! */
2334 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2336 bool verify_now = false;
2338 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2343 verify_st_order (&dummyss, ST_NONE, false);
2344 verify_st_order (&dummyss, st, false);
2346 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2352 check_function_result_typed ();
2353 function_result_typed = true;
2362 case ST_IMPLICIT_NONE:
2364 if (!function_result_typed)
2366 check_function_result_typed ();
2367 function_result_typed = true;
2373 case ST_DATA: /* Not allowed in interfaces */
2374 if (gfc_current_state () == COMP_INTERFACE)
2384 case ST_DERIVED_DECL:
2387 if (verify_st_order (&ss, st, false) == FAILURE)
2389 reject_statement ();
2390 st = next_statement ();
2400 case ST_DERIVED_DECL:
2406 if (gfc_current_state () != COMP_MODULE)
2408 gfc_error ("%s statement must appear in a MODULE",
2409 gfc_ascii_statement (st));
2413 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2415 gfc_error ("%s statement at %C follows another accessibility "
2416 "specification", gfc_ascii_statement (st));
2420 gfc_current_ns->default_access = (st == ST_PUBLIC)
2421 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2425 case ST_STATEMENT_FUNCTION:
2426 if (gfc_current_state () == COMP_MODULE)
2428 unexpected_statement (st);
2436 accept_statement (st);
2437 st = next_statement ();
2441 accept_statement (st);
2443 st = next_statement ();
2446 case ST_GET_FCN_CHARACTERISTICS:
2447 /* This statement triggers the association of a function's result
2449 ts = &gfc_current_block ()->result->ts;
2450 if (match_deferred_characteristics (ts) != MATCH_YES)
2451 bad_characteristic = true;
2453 st = next_statement ();
2460 /* If match_deferred_characteristics failed, then there is an error. */
2461 if (bad_characteristic)
2463 ts = &gfc_current_block ()->result->ts;
2464 if (ts->type != BT_DERIVED)
2465 gfc_error ("Bad kind expression for function '%s' at %L",
2466 gfc_current_block ()->name,
2467 &gfc_current_block ()->declared_at);
2469 gfc_error ("The type for function '%s' at %L is not accessible",
2470 gfc_current_block ()->name,
2471 &gfc_current_block ()->declared_at);
2473 gfc_current_block ()->ts.kind = 0;
2474 /* Keep the derived type; if it's bad, it will be discovered later. */
2475 if (!(ts->type == BT_DERIVED && ts->derived))
2476 ts->type = BT_UNKNOWN;
2483 /* Parse a WHERE block, (not a simple WHERE statement). */
2486 parse_where_block (void)
2488 int seen_empty_else;
2493 accept_statement (ST_WHERE_BLOCK);
2494 top = gfc_state_stack->tail;
2496 push_state (&s, COMP_WHERE, gfc_new_block);
2498 d = add_statement ();
2499 d->expr = top->expr;
2505 seen_empty_else = 0;
2509 st = next_statement ();
2515 case ST_WHERE_BLOCK:
2516 parse_where_block ();
2521 accept_statement (st);
2525 if (seen_empty_else)
2527 gfc_error ("ELSEWHERE statement at %C follows previous "
2528 "unmasked ELSEWHERE");
2532 if (new_st.expr == NULL)
2533 seen_empty_else = 1;
2535 d = new_level (gfc_state_stack->head);
2537 d->expr = new_st.expr;
2539 accept_statement (st);
2544 accept_statement (st);
2548 gfc_error ("Unexpected %s statement in WHERE block at %C",
2549 gfc_ascii_statement (st));
2550 reject_statement ();
2554 while (st != ST_END_WHERE);
2560 /* Parse a FORALL block (not a simple FORALL statement). */
2563 parse_forall_block (void)
2569 accept_statement (ST_FORALL_BLOCK);
2570 top = gfc_state_stack->tail;
2572 push_state (&s, COMP_FORALL, gfc_new_block);
2574 d = add_statement ();
2575 d->op = EXEC_FORALL;
2580 st = next_statement ();
2585 case ST_POINTER_ASSIGNMENT:
2588 accept_statement (st);
2591 case ST_WHERE_BLOCK:
2592 parse_where_block ();
2595 case ST_FORALL_BLOCK:
2596 parse_forall_block ();
2600 accept_statement (st);
2607 gfc_error ("Unexpected %s statement in FORALL block at %C",
2608 gfc_ascii_statement (st));
2610 reject_statement ();
2614 while (st != ST_END_FORALL);
2620 static gfc_statement parse_executable (gfc_statement);
2622 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2625 parse_if_block (void)
2634 accept_statement (ST_IF_BLOCK);
2636 top = gfc_state_stack->tail;
2637 push_state (&s, COMP_IF, gfc_new_block);
2639 new_st.op = EXEC_IF;
2640 d = add_statement ();
2642 d->expr = top->expr;
2648 st = parse_executable (ST_NONE);
2658 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2659 "statement at %L", &else_locus);
2661 reject_statement ();
2665 d = new_level (gfc_state_stack->head);
2667 d->expr = new_st.expr;
2669 accept_statement (st);
2676 gfc_error ("Duplicate ELSE statements at %L and %C",
2678 reject_statement ();
2683 else_locus = gfc_current_locus;
2685 d = new_level (gfc_state_stack->head);
2688 accept_statement (st);
2696 unexpected_statement (st);
2700 while (st != ST_ENDIF);
2703 accept_statement (st);
2707 /* Parse a SELECT block. */
2710 parse_select_block (void)
2716 accept_statement (ST_SELECT_CASE);
2718 cp = gfc_state_stack->tail;
2719 push_state (&s, COMP_SELECT, gfc_new_block);
2721 /* Make sure that the next statement is a CASE or END SELECT. */
2724 st = next_statement ();
2727 if (st == ST_END_SELECT)
2729 /* Empty SELECT CASE is OK. */
2730 accept_statement (st);
2737 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2740 reject_statement ();
2743 /* At this point, we're got a nonempty select block. */
2744 cp = new_level (cp);
2747 accept_statement (st);
2751 st = parse_executable (ST_NONE);
2758 cp = new_level (gfc_state_stack->head);
2760 gfc_clear_new_st ();
2762 accept_statement (st);
2768 /* Can't have an executable statement because of
2769 parse_executable(). */
2771 unexpected_statement (st);
2775 while (st != ST_END_SELECT);
2778 accept_statement (st);
2782 /* Given a symbol, make sure it is not an iteration variable for a DO
2783 statement. This subroutine is called when the symbol is seen in a
2784 context that causes it to become redefined. If the symbol is an
2785 iterator, we generate an error message and return nonzero. */
2788 gfc_check_do_variable (gfc_symtree *st)
2792 for (s=gfc_state_stack; s; s = s->previous)
2793 if (s->do_variable == st)
2795 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2796 "loop beginning at %L", st->name, &s->head->loc);
2804 /* Checks to see if the current statement label closes an enddo.
2805 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2806 an error) if it incorrectly closes an ENDDO. */
2809 check_do_closure (void)
2813 if (gfc_statement_label == NULL)
2816 for (p = gfc_state_stack; p; p = p->previous)
2817 if (p->state == COMP_DO)
2821 return 0; /* No loops to close */
2823 if (p->ext.end_do_label == gfc_statement_label)
2825 if (p == gfc_state_stack)
2828 gfc_error ("End of nonblock DO statement at %C is within another block");
2832 /* At this point, the label doesn't terminate the innermost loop.
2833 Make sure it doesn't terminate another one. */
2834 for (; p; p = p->previous)
2835 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2837 gfc_error ("End of nonblock DO statement at %C is interwoven "
2838 "with another DO loop");
2846 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2847 handled inside of parse_executable(), because they aren't really
2851 parse_do_block (void)
2858 s.ext.end_do_label = new_st.label;
2860 if (new_st.ext.iterator != NULL)
2861 stree = new_st.ext.iterator->var->symtree;
2865 accept_statement (ST_DO);
2867 top = gfc_state_stack->tail;
2868 push_state (&s, COMP_DO, gfc_new_block);
2870 s.do_variable = stree;
2872 top->block = new_level (top);
2873 top->block->op = EXEC_DO;
2876 st = parse_executable (ST_NONE);
2884 if (s.ext.end_do_label != NULL
2885 && s.ext.end_do_label != gfc_statement_label)
2886 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2889 if (gfc_statement_label != NULL)
2891 new_st.op = EXEC_NOP;
2896 case ST_IMPLIED_ENDDO:
2897 /* If the do-stmt of this DO construct has a do-construct-name,
2898 the corresponding end-do must be an end-do-stmt (with a matching
2899 name, but in that case we must have seen ST_ENDDO first).
2900 We only complain about this in pedantic mode. */
2901 if (gfc_current_block () != NULL)
2902 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2903 &gfc_current_block()->declared_at);
2908 unexpected_statement (st);
2913 accept_statement (st);
2917 /* Parse the statements of OpenMP do/parallel do. */
2919 static gfc_statement
2920 parse_omp_do (gfc_statement omp_st)
2926 accept_statement (omp_st);
2928 cp = gfc_state_stack->tail;
2929 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2930 np = new_level (cp);
2936 st = next_statement ();
2939 else if (st == ST_DO)
2942 unexpected_statement (st);
2946 if (gfc_statement_label != NULL
2947 && gfc_state_stack->previous != NULL
2948 && gfc_state_stack->previous->state == COMP_DO
2949 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2957 there should be no !$OMP END DO. */
2959 return ST_IMPLIED_ENDDO;
2962 check_do_closure ();
2965 st = next_statement ();
2966 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2968 if (new_st.op == EXEC_OMP_END_NOWAIT)
2969 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2971 gcc_assert (new_st.op == EXEC_NOP);
2972 gfc_clear_new_st ();
2973 gfc_commit_symbols ();
2974 gfc_warning_check ();
2975 st = next_statement ();
2981 /* Parse the statements of OpenMP atomic directive. */
2984 parse_omp_atomic (void)
2990 accept_statement (ST_OMP_ATOMIC);
2992 cp = gfc_state_stack->tail;
2993 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2994 np = new_level (cp);
3000 st = next_statement ();
3003 else if (st == ST_ASSIGNMENT)
3006 unexpected_statement (st);
3009 accept_statement (st);
3015 /* Parse the statements of an OpenMP structured block. */
3018 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3020 gfc_statement st, omp_end_st;
3024 accept_statement (omp_st);
3026 cp = gfc_state_stack->tail;
3027 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3028 np = new_level (cp);
3034 case ST_OMP_PARALLEL:
3035 omp_end_st = ST_OMP_END_PARALLEL;
3037 case ST_OMP_PARALLEL_SECTIONS:
3038 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3040 case ST_OMP_SECTIONS:
3041 omp_end_st = ST_OMP_END_SECTIONS;
3043 case ST_OMP_ORDERED:
3044 omp_end_st = ST_OMP_END_ORDERED;
3046 case ST_OMP_CRITICAL:
3047 omp_end_st = ST_OMP_END_CRITICAL;
3050 omp_end_st = ST_OMP_END_MASTER;
3053 omp_end_st = ST_OMP_END_SINGLE;
3056 omp_end_st = ST_OMP_END_TASK;
3058 case ST_OMP_WORKSHARE:
3059 omp_end_st = ST_OMP_END_WORKSHARE;
3061 case ST_OMP_PARALLEL_WORKSHARE:
3062 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3070 if (workshare_stmts_only)
3072 /* Inside of !$omp workshare, only
3075 where statements and constructs
3076 forall statements and constructs
3080 are allowed. For !$omp critical these
3081 restrictions apply recursively. */
3084 st = next_statement ();
3095 accept_statement (st);
3098 case ST_WHERE_BLOCK:
3099 parse_where_block ();
3102 case ST_FORALL_BLOCK:
3103 parse_forall_block ();
3106 case ST_OMP_PARALLEL:
3107 case ST_OMP_PARALLEL_SECTIONS:
3108 parse_omp_structured_block (st, false);
3111 case ST_OMP_PARALLEL_WORKSHARE:
3112 case ST_OMP_CRITICAL:
3113 parse_omp_structured_block (st, true);
3116 case ST_OMP_PARALLEL_DO:
3117 st = parse_omp_do (st);
3121 parse_omp_atomic ();
3132 st = next_statement ();
3136 st = parse_executable (ST_NONE);
3139 else if (st == ST_OMP_SECTION
3140 && (omp_st == ST_OMP_SECTIONS
3141 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3143 np = new_level (np);
3147 else if (st != omp_end_st)
3148 unexpected_statement (st);
3150 while (st != omp_end_st);
3154 case EXEC_OMP_END_NOWAIT:
3155 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3157 case EXEC_OMP_CRITICAL:
3158 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3159 || (new_st.ext.omp_name != NULL
3160 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3161 gfc_error ("Name after !$omp critical and !$omp end critical does "
3163 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3165 case EXEC_OMP_END_SINGLE:
3166 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3167 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3168 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3169 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3177 gfc_clear_new_st ();
3178 gfc_commit_symbols ();
3179 gfc_warning_check ();
3184 /* Accept a series of executable statements. We return the first
3185 statement that doesn't fit to the caller. Any block statements are
3186 passed on to the correct handler, which usually passes the buck
3189 static gfc_statement
3190 parse_executable (gfc_statement st)
3195 st = next_statement ();
3199 close_flag = check_do_closure ();
3204 case ST_END_PROGRAM:
3207 case ST_END_FUNCTION:
3211 case ST_END_SUBROUTINE:
3216 case ST_SELECT_CASE:
3217 gfc_error ("%s statement at %C cannot terminate a non-block "
3218 "DO loop", gfc_ascii_statement (st));
3234 accept_statement (st);
3235 if (close_flag == 1)
3236 return ST_IMPLIED_ENDDO;
3243 case ST_SELECT_CASE:
3244 parse_select_block ();
3249 if (check_do_closure () == 1)
3250 return ST_IMPLIED_ENDDO;
3253 case ST_WHERE_BLOCK:
3254 parse_where_block ();
3257 case ST_FORALL_BLOCK:
3258 parse_forall_block ();
3261 case ST_OMP_PARALLEL:
3262 case ST_OMP_PARALLEL_SECTIONS:
3263 case ST_OMP_SECTIONS:
3264 case ST_OMP_ORDERED:
3265 case ST_OMP_CRITICAL:
3269 parse_omp_structured_block (st, false);
3272 case ST_OMP_WORKSHARE:
3273 case ST_OMP_PARALLEL_WORKSHARE:
3274 parse_omp_structured_block (st, true);
3278 case ST_OMP_PARALLEL_DO:
3279 st = parse_omp_do (st);
3280 if (st == ST_IMPLIED_ENDDO)
3285 parse_omp_atomic ();
3292 st = next_statement ();
3297 /* Parse a series of contained program units. */
3299 static void parse_progunit (gfc_statement);
3302 /* Fix the symbols for sibling functions. These are incorrectly added to
3303 the child namespace as the parser didn't know about this procedure. */
3306 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3310 gfc_symbol *old_sym;
3312 sym->attr.referenced = 1;
3313 for (ns = siblings; ns; ns = ns->sibling)
3315 st = gfc_find_symtree (ns->sym_root, sym->name);
3317 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3318 goto fixup_contained;
3320 old_sym = st->n.sym;
3321 if (old_sym->ns == ns
3322 && !old_sym->attr.contained
3324 /* By 14.6.1.3, host association should be excluded
3325 for the following. */
3326 && !(old_sym->attr.external
3327 || (old_sym->ts.type != BT_UNKNOWN
3328 && !old_sym->attr.implicit_type)
3329 || old_sym->attr.flavor == FL_PARAMETER
3330 || old_sym->attr.in_common
3331 || old_sym->attr.in_equivalence
3332 || old_sym->attr.data
3333 || old_sym->attr.dummy
3334 || old_sym->attr.result
3335 || old_sym->attr.dimension
3336 || old_sym->attr.allocatable
3337 || old_sym->attr.intrinsic
3338 || old_sym->attr.generic
3339 || old_sym->attr.flavor == FL_NAMELIST
3340 || old_sym->attr.proc == PROC_ST_FUNCTION))
3342 /* Replace it with the symbol from the parent namespace. */
3346 /* Free the old (local) symbol. */
3348 if (old_sym->refs == 0)
3349 gfc_free_symbol (old_sym);
3353 /* Do the same for any contained procedures. */
3354 gfc_fixup_sibling_symbols (sym, ns->contained);
3359 parse_contained (int module)
3361 gfc_namespace *ns, *parent_ns, *tmp;
3362 gfc_state_data s1, s2;
3366 int contains_statements = 0;
3369 push_state (&s1, COMP_CONTAINS, NULL);
3370 parent_ns = gfc_current_ns;
3374 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3376 gfc_current_ns->sibling = parent_ns->contained;
3377 parent_ns->contained = gfc_current_ns;
3380 /* Process the next available statement. We come here if we got an error
3381 and rejected the last statement. */
3382 st = next_statement ();
3391 contains_statements = 1;
3392 accept_statement (st);
3395 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3398 /* For internal procedures, create/update the symbol in the
3399 parent namespace. */
3403 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3404 gfc_error ("Contained procedure '%s' at %C is already "
3405 "ambiguous", gfc_new_block->name);
3408 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3409 &gfc_new_block->declared_at) ==
3412 if (st == ST_FUNCTION)
3413 gfc_add_function (&sym->attr, sym->name,
3414 &gfc_new_block->declared_at);
3416 gfc_add_subroutine (&sym->attr, sym->name,
3417 &gfc_new_block->declared_at);
3421 gfc_commit_symbols ();
3424 sym = gfc_new_block;
3426 /* Mark this as a contained function, so it isn't replaced
3427 by other module functions. */
3428 sym->attr.contained = 1;
3429 sym->attr.referenced = 1;
3431 parse_progunit (ST_NONE);
3433 /* Fix up any sibling functions that refer to this one. */
3434 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3435 /* Or refer to any of its alternate entry points. */
3436 for (el = gfc_current_ns->entries; el; el = el->next)
3437 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3439 gfc_current_ns->code = s2.head;
3440 gfc_current_ns = parent_ns;
3445 /* These statements are associated with the end of the host unit. */
3446 case ST_END_FUNCTION:
3448 case ST_END_PROGRAM:
3449 case ST_END_SUBROUTINE:
3450 accept_statement (st);
3454 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3455 gfc_ascii_statement (st));
3456 reject_statement ();
3462 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3463 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3465 /* The first namespace in the list is guaranteed to not have
3466 anything (worthwhile) in it. */
3467 tmp = gfc_current_ns;
3468 gfc_current_ns = parent_ns;
3469 if (seen_error && tmp->refs > 1)
3470 gfc_free_namespace (tmp);
3472 ns = gfc_current_ns->contained;
3473 gfc_current_ns->contained = ns->sibling;
3474 gfc_free_namespace (ns);
3477 if (!contains_statements)
3478 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3479 "FUNCTION or SUBROUTINE statement at %C");
3483 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3486 parse_progunit (gfc_statement st)
3491 st = parse_spec (st);
3501 accept_statement (st);
3508 if (gfc_current_state () == COMP_FUNCTION)
3509 gfc_check_function_type (gfc_current_ns);
3514 st = parse_executable (st);
3525 accept_statement (st);
3532 unexpected_statement (st);
3533 reject_statement ();
3534 st = next_statement ();
3540 for (p = gfc_state_stack; p; p = p->previous)
3541 if (p->state == COMP_CONTAINS)
3544 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3549 gfc_error ("CONTAINS statement at %C is already in a contained "
3551 st = next_statement ();
3555 parse_contained (0);
3558 gfc_current_ns->code = gfc_state_stack->head;
3562 /* Come here to complain about a global symbol already in use as
3566 gfc_global_used (gfc_gsymbol *sym, locus *where)
3571 where = &gfc_current_locus;
3581 case GSYM_SUBROUTINE:
3582 name = "SUBROUTINE";
3587 case GSYM_BLOCK_DATA:
3588 name = "BLOCK DATA";
3594 gfc_internal_error ("gfc_global_used(): Bad type");
3598 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3599 sym->name, where, name, &sym->where);
3603 /* Parse a block data program unit. */
3606 parse_block_data (void)
3609 static locus blank_locus;
3610 static int blank_block=0;
3613 gfc_current_ns->proc_name = gfc_new_block;
3614 gfc_current_ns->is_block_data = 1;
3616 if (gfc_new_block == NULL)
3619 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3620 "prior BLOCK DATA at %L", &blank_locus);
3624 blank_locus = gfc_current_locus;
3629 s = gfc_get_gsymbol (gfc_new_block->name);
3631 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3632 gfc_global_used(s, NULL);
3635 s->type = GSYM_BLOCK_DATA;
3636 s->where = gfc_current_locus;
3641 st = parse_spec (ST_NONE);
3643 while (st != ST_END_BLOCK_DATA)
3645 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3646 gfc_ascii_statement (st));
3647 reject_statement ();
3648 st = next_statement ();
3653 /* Parse a module subprogram. */
3661 s = gfc_get_gsymbol (gfc_new_block->name);
3662 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3663 gfc_global_used(s, NULL);
3666 s->type = GSYM_MODULE;
3667 s->where = gfc_current_locus;
3671 st = parse_spec (ST_NONE);
3680 parse_contained (1);
3684 accept_statement (st);
3688 gfc_error ("Unexpected %s statement in MODULE at %C",
3689 gfc_ascii_statement (st));
3691 reject_statement ();
3692 st = next_statement ();
3698 /* Add a procedure name to the global symbol table. */
3701 add_global_procedure (int sub)
3705 s = gfc_get_gsymbol(gfc_new_block->name);
3708 || (s->type != GSYM_UNKNOWN
3709 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3710 gfc_global_used(s, NULL);
3713 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3714 s->where = gfc_current_locus;
3716 s->ns = gfc_current_ns;
3721 /* Add a program to the global symbol table. */
3724 add_global_program (void)
3728 if (gfc_new_block == NULL)
3730 s = gfc_get_gsymbol (gfc_new_block->name);
3732 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3733 gfc_global_used(s, NULL);
3736 s->type = GSYM_PROGRAM;
3737 s->where = gfc_current_locus;
3739 s->ns = gfc_current_ns;
3744 /* Top level parser. */
3747 gfc_parse_file (void)
3749 int seen_program, errors_before, errors;
3750 gfc_state_data top, s;
3753 gfc_namespace *next;
3755 gfc_start_source_files ();
3757 top.state = COMP_NONE;
3759 top.previous = NULL;
3760 top.head = top.tail = NULL;
3761 top.do_variable = NULL;
3763 gfc_state_stack = ⊤
3765 gfc_clear_new_st ();
3767 gfc_statement_label = NULL;
3769 if (setjmp (eof_buf))
3770 return FAILURE; /* Come here on unexpected EOF */
3772 /* Prepare the global namespace that will contain the
3774 gfc_global_ns_list = next = NULL;
3778 /* Exit early for empty files. */
3784 st = next_statement ();
3793 goto duplicate_main;
3795 prog_locus = gfc_current_locus;
3797 push_state (&s, COMP_PROGRAM, gfc_new_block);
3798 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3799 accept_statement (st);
3800 add_global_program ();
3801 parse_progunit (ST_NONE);
3802 if (gfc_option.flag_whole_file)
3807 add_global_procedure (1);
3808 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3809 accept_statement (st);
3810 parse_progunit (ST_NONE);
3811 if (gfc_option.flag_whole_file)
3816 add_global_procedure (0);
3817 push_state (&s, COMP_FUNCTION, gfc_new_block);
3818 accept_statement (st);
3819 parse_progunit (ST_NONE);
3820 if (gfc_option.flag_whole_file)
3825 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3826 accept_statement (st);
3827 parse_block_data ();
3831 push_state (&s, COMP_MODULE, gfc_new_block);
3832 accept_statement (st);
3834 gfc_get_errors (NULL, &errors_before);
3838 /* Anything else starts a nameless main program block. */
3841 goto duplicate_main;
3843 prog_locus = gfc_current_locus;
3845 push_state (&s, COMP_PROGRAM, gfc_new_block);
3846 main_program_symbol (gfc_current_ns, "MAIN__");
3847 parse_progunit (st);
3848 if (gfc_option.flag_whole_file)
3853 /* Handle the non-program units. */
3854 gfc_current_ns->code = s.head;
3856 gfc_resolve (gfc_current_ns);
3858 /* Dump the parse tree if requested. */
3859 if (gfc_option.dump_parse_tree)
3860 gfc_dump_parse_tree (gfc_current_ns, stdout);
3862 gfc_get_errors (NULL, &errors);
3863 if (s.state == COMP_MODULE)
3865 gfc_dump_module (s.sym->name, errors_before == errors);
3867 gfc_generate_module_code (gfc_current_ns);
3872 gfc_generate_code (gfc_current_ns);
3880 /* The main program and non-contained procedures are put
3881 in the global namespace list, so that they can be processed
3882 later and all their interfaces resolved. */
3883 gfc_current_ns->code = s.head;
3885 next->sibling = gfc_current_ns;
3887 gfc_global_ns_list = gfc_current_ns;
3889 next = gfc_current_ns;
3896 if (!gfc_option.flag_whole_file)
3899 /* Do the resolution. */
3900 gfc_current_ns = gfc_global_ns_list;
3901 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3903 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3904 gfc_resolve (gfc_current_ns);
3907 /* Do the parse tree dump. */
3908 gfc_current_ns = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
3909 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3911 gfc_dump_parse_tree (gfc_current_ns, stdout);
3912 fputs ("-----------------------------------------\n\n", stdout);
3915 gfc_current_ns = gfc_global_ns_list;
3916 gfc_get_errors (NULL, &errors);
3918 /* Do the translation. This could be in a different order to
3919 resolution if there are forward references in the file. */
3920 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3922 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3923 gfc_generate_code (gfc_current_ns);
3927 gfc_free_dt_list ();
3929 gfc_end_source_files ();
3933 /* If we see a duplicate main program, shut down. If the second
3934 instance is an implied main program, i.e. data decls or executable
3935 statements, we're in for lots of errors. */
3936 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3937 reject_statement ();