2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
30 /* Current statement label. Zero means no statement label. Because new_st
31 can get wiped during statement matching, we have to keep it separate. */
33 gfc_st_label *gfc_statement_label;
35 static locus label_locus;
36 static jmp_buf eof_buf;
38 gfc_state_data *gfc_state_stack;
40 /* TODO: Re-order functions to kill these forward decls. */
41 static void check_statement_label (gfc_statement);
42 static void undo_new_statement (void);
43 static void reject_statement (void);
46 /* A sort of half-matching function. We try to match the word on the
47 input with the passed string. If this succeeds, we call the
48 keyword-dependent matching function that will match the rest of the
49 statement. For single keywords, the matching subroutine is
53 match_word (const char *str, match (*subr) (void), locus *old_locus)
68 gfc_current_locus = *old_locus;
76 /* Figure out what the next statement is, (mostly) regardless of
77 proper ordering. The do...while(0) is there to prevent if/else
80 #define match(keyword, subr, st) \
82 if (match_word(keyword, subr, &old_locus) == MATCH_YES) \
85 undo_new_statement (); \
89 /* This is a specialist version of decode_statement that is used
90 for the specification statements in a function, whose
91 characteristics are deferred into the specification statements.
92 eg.: INTEGER (king = mykind) foo ()
93 USE mymodule, ONLY mykind.....
94 The KIND parameter needs a return after USE or IMPORT, whereas
95 derived type declarations can occur anywhere, up the executable
96 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
97 out of the correct kind of specification statements. */
99 decode_specification_statement (void)
105 if (gfc_match_eos () == MATCH_YES)
108 old_locus = gfc_current_locus;
110 match ("import", gfc_match_import, ST_IMPORT);
111 match ("use", gfc_match_use, ST_USE);
113 if (gfc_current_block ()->ts.type != BT_DERIVED)
116 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
117 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
118 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
120 /* General statement matching: Instead of testing every possible
121 statement, we eliminate most possibilities by peeking at the
124 c = gfc_peek_ascii_char ();
129 match ("abstract% interface", gfc_match_abstract_interface,
134 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
141 match ("data", gfc_match_data, ST_DATA);
142 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
146 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
147 match ("entry% ", gfc_match_entry, ST_ENTRY);
148 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
149 match ("external", gfc_match_external, ST_ATTR_DECL);
153 match ("format", gfc_match_format, ST_FORMAT);
160 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
161 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
162 match ("interface", gfc_match_interface, ST_INTERFACE);
163 match ("intent", gfc_match_intent, ST_ATTR_DECL);
164 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
171 match ("namelist", gfc_match_namelist, ST_NAMELIST);
175 match ("optional", gfc_match_optional, ST_ATTR_DECL);
179 match ("parameter", gfc_match_parameter, ST_PARAMETER);
180 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
181 if (gfc_match_private (&st) == MATCH_YES)
183 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
184 if (gfc_match_public (&st) == MATCH_YES)
186 match ("protected", gfc_match_protected, ST_ATTR_DECL);
193 match ("save", gfc_match_save, ST_ATTR_DECL);
197 match ("target", gfc_match_target, ST_ATTR_DECL);
198 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
205 match ("value", gfc_match_value, ST_ATTR_DECL);
206 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
213 /* This is not a specification statement. See if any of the matchers
214 has stored an error message of some sort. */
218 gfc_buffer_error (0);
219 gfc_current_locus = old_locus;
221 return ST_GET_FCN_CHARACTERISTICS;
225 /* This is the primary 'decode_statement'. */
227 decode_statement (void)
238 gfc_clear_error (); /* Clear any pending errors. */
239 gfc_clear_warning (); /* Clear any pending warnings. */
241 gfc_matching_function = false;
243 if (gfc_match_eos () == MATCH_YES)
246 if (gfc_current_state () == COMP_FUNCTION
247 && gfc_current_block ()->result->ts.kind == -1)
248 return decode_specification_statement ();
250 old_locus = gfc_current_locus;
252 /* Try matching a data declaration or function declaration. The
253 input "REALFUNCTIONA(N)" can mean several things in different
254 contexts, so it (and its relatives) get special treatment. */
256 if (gfc_current_state () == COMP_NONE
257 || gfc_current_state () == COMP_INTERFACE
258 || gfc_current_state () == COMP_CONTAINS)
260 gfc_matching_function = true;
261 m = gfc_match_function_decl ();
264 else if (m == MATCH_ERROR)
268 gfc_current_locus = old_locus;
270 gfc_matching_function = false;
273 /* Match statements whose error messages are meant to be overwritten
274 by something better. */
276 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
277 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
278 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
280 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
281 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
283 /* Try to match a subroutine statement, which has the same optional
284 prefixes that functions can have. */
286 if (gfc_match_subroutine () == MATCH_YES)
287 return ST_SUBROUTINE;
289 gfc_current_locus = old_locus;
291 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
292 might begin with a block label. The match functions for these
293 statements are unusual in that their keyword is not seen before
294 the matcher is called. */
296 if (gfc_match_if (&st) == MATCH_YES)
299 gfc_current_locus = old_locus;
301 if (gfc_match_where (&st) == MATCH_YES)
304 gfc_current_locus = old_locus;
306 if (gfc_match_forall (&st) == MATCH_YES)
309 gfc_current_locus = old_locus;
311 match (NULL, gfc_match_do, ST_DO);
312 match (NULL, gfc_match_select, ST_SELECT_CASE);
314 /* General statement matching: Instead of testing every possible
315 statement, we eliminate most possibilities by peeking at the
318 c = gfc_peek_ascii_char ();
323 match ("abstract% interface", gfc_match_abstract_interface,
325 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
326 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
327 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
331 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
332 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
333 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
337 match ("call", gfc_match_call, ST_CALL);
338 match ("close", gfc_match_close, ST_CLOSE);
339 match ("continue", gfc_match_continue, ST_CONTINUE);
340 match ("cycle", gfc_match_cycle, ST_CYCLE);
341 match ("case", gfc_match_case, ST_CASE);
342 match ("common", gfc_match_common, ST_COMMON);
343 match ("contains", gfc_match_eos, ST_CONTAINS);
347 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
348 match ("data", gfc_match_data, ST_DATA);
349 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
353 match ("end file", gfc_match_endfile, ST_END_FILE);
354 match ("exit", gfc_match_exit, ST_EXIT);
355 match ("else", gfc_match_else, ST_ELSE);
356 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
357 match ("else if", gfc_match_elseif, ST_ELSEIF);
358 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
360 if (gfc_match_end (&st) == MATCH_YES)
363 match ("entry% ", gfc_match_entry, ST_ENTRY);
364 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
365 match ("external", gfc_match_external, ST_ATTR_DECL);
369 match ("final", gfc_match_final_decl, ST_FINAL);
370 match ("flush", gfc_match_flush, ST_FLUSH);
371 match ("format", gfc_match_format, ST_FORMAT);
375 match ("generic", gfc_match_generic, ST_GENERIC);
376 match ("go to", gfc_match_goto, ST_GOTO);
380 match ("inquire", gfc_match_inquire, ST_INQUIRE);
381 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
382 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
383 match ("import", gfc_match_import, ST_IMPORT);
384 match ("interface", gfc_match_interface, ST_INTERFACE);
385 match ("intent", gfc_match_intent, ST_ATTR_DECL);
386 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
390 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
391 match ("module", gfc_match_module, ST_MODULE);
395 match ("nullify", gfc_match_nullify, ST_NULLIFY);
396 match ("namelist", gfc_match_namelist, ST_NAMELIST);
400 match ("open", gfc_match_open, ST_OPEN);
401 match ("optional", gfc_match_optional, ST_ATTR_DECL);
405 match ("print", gfc_match_print, ST_WRITE);
406 match ("parameter", gfc_match_parameter, ST_PARAMETER);
407 match ("pause", gfc_match_pause, ST_PAUSE);
408 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
409 if (gfc_match_private (&st) == MATCH_YES)
411 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
412 match ("program", gfc_match_program, ST_PROGRAM);
413 if (gfc_match_public (&st) == MATCH_YES)
415 match ("protected", gfc_match_protected, ST_ATTR_DECL);
419 match ("read", gfc_match_read, ST_READ);
420 match ("return", gfc_match_return, ST_RETURN);
421 match ("rewind", gfc_match_rewind, ST_REWIND);
425 match ("sequence", gfc_match_eos, ST_SEQUENCE);
426 match ("stop", gfc_match_stop, ST_STOP);
427 match ("save", gfc_match_save, ST_ATTR_DECL);
431 match ("target", gfc_match_target, ST_ATTR_DECL);
432 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
436 match ("use", gfc_match_use, ST_USE);
440 match ("value", gfc_match_value, ST_ATTR_DECL);
441 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
445 match ("wait", gfc_match_wait, ST_WAIT);
446 match ("write", gfc_match_write, ST_WRITE);
450 /* All else has failed, so give up. See if any of the matchers has
451 stored an error message of some sort. */
453 if (gfc_error_check () == 0)
454 gfc_error_now ("Unclassifiable statement at %C");
458 gfc_error_recovery ();
464 decode_omp_directive (void)
473 gfc_clear_error (); /* Clear any pending errors. */
474 gfc_clear_warning (); /* Clear any pending warnings. */
478 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
479 "or ELEMENTAL procedures");
480 gfc_error_recovery ();
484 old_locus = gfc_current_locus;
486 /* General OpenMP directive matching: Instead of testing every possible
487 statement, we eliminate most possibilities by peeking at the
490 c = gfc_peek_ascii_char ();
495 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
498 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
501 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
504 match ("do", gfc_match_omp_do, ST_OMP_DO);
507 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
508 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
509 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
510 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
511 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
512 match ("end parallel sections", gfc_match_omp_eos,
513 ST_OMP_END_PARALLEL_SECTIONS);
514 match ("end parallel workshare", gfc_match_omp_eos,
515 ST_OMP_END_PARALLEL_WORKSHARE);
516 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
517 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
518 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
519 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
520 match ("end workshare", gfc_match_omp_end_nowait,
521 ST_OMP_END_WORKSHARE);
524 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
527 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
530 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
533 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
534 match ("parallel sections", gfc_match_omp_parallel_sections,
535 ST_OMP_PARALLEL_SECTIONS);
536 match ("parallel workshare", gfc_match_omp_parallel_workshare,
537 ST_OMP_PARALLEL_WORKSHARE);
538 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
541 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
542 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
543 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
546 match ("task", gfc_match_omp_task, ST_OMP_TASK);
547 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
548 match ("threadprivate", gfc_match_omp_threadprivate,
549 ST_OMP_THREADPRIVATE);
551 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
555 /* All else has failed, so give up. See if any of the matchers has
556 stored an error message of some sort. */
558 if (gfc_error_check () == 0)
559 gfc_error_now ("Unclassifiable OpenMP directive at %C");
563 gfc_error_recovery ();
571 /* Get the next statement in free form source. */
580 at_bol = gfc_at_bol ();
581 gfc_gobble_whitespace ();
583 c = gfc_peek_ascii_char ();
589 /* Found a statement label? */
590 m = gfc_match_st_label (&gfc_statement_label);
592 d = gfc_peek_ascii_char ();
593 if (m != MATCH_YES || !gfc_is_whitespace (d))
595 gfc_match_small_literal_int (&i, &cnt);
598 gfc_error_now ("Too many digits in statement label at %C");
601 gfc_error_now ("Zero is not a valid statement label at %C");
604 c = gfc_next_ascii_char ();
607 if (!gfc_is_whitespace (c))
608 gfc_error_now ("Non-numeric character in statement label at %C");
614 label_locus = gfc_current_locus;
616 gfc_gobble_whitespace ();
618 if (at_bol && gfc_peek_ascii_char () == ';')
620 gfc_error_now ("Semicolon at %C needs to be preceded by "
622 gfc_next_ascii_char (); /* Eat up the semicolon. */
626 if (gfc_match_eos () == MATCH_YES)
628 gfc_warning_now ("Ignoring statement label in empty statement "
630 gfc_free_st_label (gfc_statement_label);
631 gfc_statement_label = NULL;
638 /* Comments have already been skipped by the time we get here,
639 except for OpenMP directives. */
640 if (gfc_option.flag_openmp)
644 c = gfc_next_ascii_char ();
645 for (i = 0; i < 5; i++, c = gfc_next_ascii_char ())
646 gcc_assert (c == "!$omp"[i]);
648 gcc_assert (c == ' ' || c == '\t');
649 gfc_gobble_whitespace ();
650 return decode_omp_directive ();
654 if (at_bol && c == ';')
656 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
657 gfc_next_ascii_char (); /* Eat up the semicolon. */
661 return decode_statement ();
665 /* Get the next statement in fixed-form source. */
670 int label, digit_flag, i;
675 return decode_statement ();
677 /* Skip past the current label field, parsing a statement label if
678 one is there. This is a weird number parser, since the number is
679 contained within five columns and can have any kind of embedded
680 spaces. We also check for characters that make the rest of the
686 for (i = 0; i < 5; i++)
688 c = gfc_next_char_literal (0);
705 label = label * 10 + ((unsigned char) c - '0');
706 label_locus = gfc_current_locus;
710 /* Comments have already been skipped by the time we get
711 here, except for OpenMP directives. */
713 if (gfc_option.flag_openmp)
715 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
716 gcc_assert ((char) gfc_wide_tolower (c) == "*$omp"[i]);
718 if (c != ' ' && c != '0')
720 gfc_buffer_error (0);
721 gfc_error ("Bad continuation line at %C");
725 return decode_omp_directive ();
729 /* Comments have already been skipped by the time we get
730 here so don't bother checking for them. */
733 gfc_buffer_error (0);
734 gfc_error ("Non-numeric character in statement label at %C");
742 gfc_warning_now ("Zero is not a valid statement label at %C");
745 /* We've found a valid statement label. */
746 gfc_statement_label = gfc_get_st_label (label);
750 /* Since this line starts a statement, it cannot be a continuation
751 of a previous statement. If we see something here besides a
752 space or zero, it must be a bad continuation line. */
754 c = gfc_next_char_literal (0);
758 if (c != ' ' && c != '0')
760 gfc_buffer_error (0);
761 gfc_error ("Bad continuation line at %C");
765 /* Now that we've taken care of the statement label columns, we have
766 to make sure that the first nonblank character is not a '!'. If
767 it is, the rest of the line is a comment. */
771 loc = gfc_current_locus;
772 c = gfc_next_char_literal (0);
774 while (gfc_is_whitespace (c));
778 gfc_current_locus = loc;
782 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
786 if (gfc_match_eos () == MATCH_YES)
789 /* At this point, we've got a nonblank statement to parse. */
790 return decode_statement ();
794 gfc_warning ("Ignoring statement label in empty statement at %C");
800 /* Return the next non-ST_NONE statement to the caller. We also worry
801 about including files and the ends of include files at this stage. */
804 next_statement (void)
808 gfc_new_block = NULL;
812 gfc_statement_label = NULL;
813 gfc_buffer_error (1);
817 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
818 && gfc_current_locus.lb
819 && gfc_current_locus.lb->truncated)
820 gfc_warning_now ("Line truncated at %C");
825 gfc_skip_comments ();
833 if (gfc_define_undef_line ())
836 old_locus = gfc_current_locus;
838 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
844 gfc_buffer_error (0);
846 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
848 gfc_free_st_label (gfc_statement_label);
849 gfc_statement_label = NULL;
850 gfc_current_locus = old_locus;
854 check_statement_label (st);
860 /****************************** Parser ***********************************/
862 /* The parser subroutines are of type 'try' that fail if the file ends
865 /* Macros that expand to case-labels for various classes of
866 statements. Start with executable statements that directly do
869 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
870 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
871 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
872 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
873 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
874 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
875 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
876 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
877 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
879 /* Statements that mark other executable statements. */
881 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
882 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
883 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
884 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
885 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
886 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
889 /* Declaration statements */
891 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
892 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
893 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
896 /* Block end statements. Errors associated with interchanging these
897 are detected in gfc_match_end(). */
899 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
900 case ST_END_PROGRAM: case ST_END_SUBROUTINE
903 /* Push a new state onto the stack. */
906 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
908 p->state = new_state;
909 p->previous = gfc_state_stack;
911 p->head = p->tail = NULL;
912 p->do_variable = NULL;
917 /* Pop the current state. */
921 gfc_state_stack = gfc_state_stack->previous;
925 /* Try to find the given state in the state stack. */
928 gfc_find_state (gfc_compile_state state)
932 for (p = gfc_state_stack; p; p = p->previous)
933 if (p->state == state)
936 return (p == NULL) ? FAILURE : SUCCESS;
940 /* Starts a new level in the statement list. */
943 new_level (gfc_code *q)
947 p = q->block = gfc_get_code ();
949 gfc_state_stack->head = gfc_state_stack->tail = p;
955 /* Add the current new_st code structure and adds it to the current
956 program unit. As a side-effect, it zeroes the new_st. */
966 p->loc = gfc_current_locus;
968 if (gfc_state_stack->head == NULL)
969 gfc_state_stack->head = p;
971 gfc_state_stack->tail->next = p;
973 while (p->next != NULL)
976 gfc_state_stack->tail = p;
984 /* Frees everything associated with the current statement. */
987 undo_new_statement (void)
989 gfc_free_statements (new_st.block);
990 gfc_free_statements (new_st.next);
991 gfc_free_statement (&new_st);
996 /* If the current statement has a statement label, make sure that it
997 is allowed to, or should have one. */
1000 check_statement_label (gfc_statement st)
1004 if (gfc_statement_label == NULL)
1006 if (st == ST_FORMAT)
1007 gfc_error ("FORMAT statement at %L does not have a statement label",
1014 case ST_END_PROGRAM:
1015 case ST_END_FUNCTION:
1016 case ST_END_SUBROUTINE:
1022 type = ST_LABEL_TARGET;
1026 type = ST_LABEL_FORMAT;
1029 /* Statement labels are not restricted from appearing on a
1030 particular line. However, there are plenty of situations
1031 where the resulting label can't be referenced. */
1034 type = ST_LABEL_BAD_TARGET;
1038 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1040 new_st.here = gfc_statement_label;
1044 /* Figures out what the enclosing program unit is. This will be a
1045 function, subroutine, program, block data or module. */
1048 gfc_enclosing_unit (gfc_compile_state * result)
1052 for (p = gfc_state_stack; p; p = p->previous)
1053 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1054 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1055 || p->state == COMP_PROGRAM)
1064 *result = COMP_PROGRAM;
1069 /* Translate a statement enum to a string. */
1072 gfc_ascii_statement (gfc_statement st)
1078 case ST_ARITHMETIC_IF:
1079 p = _("arithmetic IF");
1085 p = _("attribute declaration");
1115 p = _("data declaration");
1123 case ST_DERIVED_DECL:
1124 p = _("derived type declaration");
1138 case ST_END_BLOCK_DATA:
1139 p = "END BLOCK DATA";
1150 case ST_END_FUNCTION:
1156 case ST_END_INTERFACE:
1157 p = "END INTERFACE";
1162 case ST_END_PROGRAM:
1168 case ST_END_SUBROUTINE:
1169 p = "END SUBROUTINE";
1180 case ST_EQUIVALENCE:
1189 case ST_FORALL_BLOCK: /* Fall through */
1211 case ST_IMPLICIT_NONE:
1212 p = "IMPLICIT NONE";
1214 case ST_IMPLIED_ENDDO:
1215 p = _("implied END DO");
1241 case ST_MODULE_PROC:
1242 p = "MODULE PROCEDURE";
1280 case ST_WHERE_BLOCK: /* Fall through */
1291 p = _("assignment");
1293 case ST_POINTER_ASSIGNMENT:
1294 p = _("pointer assignment");
1296 case ST_SELECT_CASE:
1305 case ST_STATEMENT_FUNCTION:
1306 p = "STATEMENT FUNCTION";
1308 case ST_LABEL_ASSIGNMENT:
1309 p = "LABEL ASSIGNMENT";
1312 p = "ENUM DEFINITION";
1315 p = "ENUMERATOR DEFINITION";
1323 case ST_OMP_BARRIER:
1324 p = "!$OMP BARRIER";
1326 case ST_OMP_CRITICAL:
1327 p = "!$OMP CRITICAL";
1332 case ST_OMP_END_CRITICAL:
1333 p = "!$OMP END CRITICAL";
1338 case ST_OMP_END_MASTER:
1339 p = "!$OMP END MASTER";
1341 case ST_OMP_END_ORDERED:
1342 p = "!$OMP END ORDERED";
1344 case ST_OMP_END_PARALLEL:
1345 p = "!$OMP END PARALLEL";
1347 case ST_OMP_END_PARALLEL_DO:
1348 p = "!$OMP END PARALLEL DO";
1350 case ST_OMP_END_PARALLEL_SECTIONS:
1351 p = "!$OMP END PARALLEL SECTIONS";
1353 case ST_OMP_END_PARALLEL_WORKSHARE:
1354 p = "!$OMP END PARALLEL WORKSHARE";
1356 case ST_OMP_END_SECTIONS:
1357 p = "!$OMP END SECTIONS";
1359 case ST_OMP_END_SINGLE:
1360 p = "!$OMP END SINGLE";
1362 case ST_OMP_END_TASK:
1363 p = "!$OMP END TASK";
1365 case ST_OMP_END_WORKSHARE:
1366 p = "!$OMP END WORKSHARE";
1374 case ST_OMP_ORDERED:
1375 p = "!$OMP ORDERED";
1377 case ST_OMP_PARALLEL:
1378 p = "!$OMP PARALLEL";
1380 case ST_OMP_PARALLEL_DO:
1381 p = "!$OMP PARALLEL DO";
1383 case ST_OMP_PARALLEL_SECTIONS:
1384 p = "!$OMP PARALLEL SECTIONS";
1386 case ST_OMP_PARALLEL_WORKSHARE:
1387 p = "!$OMP PARALLEL WORKSHARE";
1389 case ST_OMP_SECTIONS:
1390 p = "!$OMP SECTIONS";
1392 case ST_OMP_SECTION:
1393 p = "!$OMP SECTION";
1401 case ST_OMP_TASKWAIT:
1402 p = "!$OMP TASKWAIT";
1404 case ST_OMP_THREADPRIVATE:
1405 p = "!$OMP THREADPRIVATE";
1407 case ST_OMP_WORKSHARE:
1408 p = "!$OMP WORKSHARE";
1411 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1418 /* Create a symbol for the main program and assign it to ns->proc_name. */
1421 main_program_symbol (gfc_namespace *ns, const char *name)
1423 gfc_symbol *main_program;
1424 symbol_attribute attr;
1426 gfc_get_symbol (name, ns, &main_program);
1427 gfc_clear_attr (&attr);
1428 attr.flavor = FL_PROGRAM;
1429 attr.proc = PROC_UNKNOWN;
1430 attr.subroutine = 1;
1431 attr.access = ACCESS_PUBLIC;
1432 attr.is_main_program = 1;
1433 main_program->attr = attr;
1434 main_program->declared_at = gfc_current_locus;
1435 ns->proc_name = main_program;
1436 gfc_commit_symbols ();
1440 /* Do whatever is necessary to accept the last statement. */
1443 accept_statement (gfc_statement st)
1451 case ST_IMPLICIT_NONE:
1452 gfc_set_implicit_none ();
1461 gfc_current_ns->proc_name = gfc_new_block;
1464 /* If the statement is the end of a block, lay down a special code
1465 that allows a branch to the end of the block from within the
1470 if (gfc_statement_label != NULL)
1472 new_st.op = EXEC_NOP;
1478 /* The end-of-program unit statements do not get the special
1479 marker and require a statement of some sort if they are a
1482 case ST_END_PROGRAM:
1483 case ST_END_FUNCTION:
1484 case ST_END_SUBROUTINE:
1485 if (gfc_statement_label != NULL)
1487 new_st.op = EXEC_RETURN;
1503 gfc_commit_symbols ();
1504 gfc_warning_check ();
1505 gfc_clear_new_st ();
1509 /* Undo anything tentative that has been built for the current
1513 reject_statement (void)
1515 gfc_new_block = NULL;
1516 gfc_undo_symbols ();
1517 gfc_clear_warning ();
1518 undo_new_statement ();
1522 /* Generic complaint about an out of order statement. We also do
1523 whatever is necessary to clean up. */
1526 unexpected_statement (gfc_statement st)
1528 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1530 reject_statement ();
1534 /* Given the next statement seen by the matcher, make sure that it is
1535 in proper order with the last. This subroutine is initialized by
1536 calling it with an argument of ST_NONE. If there is a problem, we
1537 issue an error and return FAILURE. Otherwise we return SUCCESS.
1539 Individual parsers need to verify that the statements seen are
1540 valid before calling here, i.e., ENTRY statements are not allowed in
1541 INTERFACE blocks. The following diagram is taken from the standard:
1543 +---------------------------------------+
1544 | program subroutine function module |
1545 +---------------------------------------+
1547 +---------------------------------------+
1549 +---------------------------------------+
1551 | +-----------+------------------+
1552 | | parameter | implicit |
1553 | +-----------+------------------+
1554 | format | | derived type |
1555 | entry | parameter | interface |
1556 | | data | specification |
1557 | | | statement func |
1558 | +-----------+------------------+
1559 | | data | executable |
1560 +--------+-----------+------------------+
1562 +---------------------------------------+
1563 | internal module/subprogram |
1564 +---------------------------------------+
1566 +---------------------------------------+
1573 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1574 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1577 gfc_statement last_statement;
1583 verify_st_order (st_state *p, gfc_statement st, bool silent)
1589 p->state = ORDER_START;
1593 if (p->state > ORDER_USE)
1595 p->state = ORDER_USE;
1599 if (p->state > ORDER_IMPORT)
1601 p->state = ORDER_IMPORT;
1604 case ST_IMPLICIT_NONE:
1605 if (p->state > ORDER_IMPLICIT_NONE)
1608 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1609 statement disqualifies a USE but not an IMPLICIT NONE.
1610 Duplicate IMPLICIT NONEs are caught when the implicit types
1613 p->state = ORDER_IMPLICIT_NONE;
1617 if (p->state > ORDER_IMPLICIT)
1619 p->state = ORDER_IMPLICIT;
1624 if (p->state < ORDER_IMPLICIT_NONE)
1625 p->state = ORDER_IMPLICIT_NONE;
1629 if (p->state >= ORDER_EXEC)
1631 if (p->state < ORDER_IMPLICIT)
1632 p->state = ORDER_IMPLICIT;
1636 if (p->state < ORDER_SPEC)
1637 p->state = ORDER_SPEC;
1642 case ST_DERIVED_DECL:
1644 if (p->state >= ORDER_EXEC)
1646 if (p->state < ORDER_SPEC)
1647 p->state = ORDER_SPEC;
1652 if (p->state < ORDER_EXEC)
1653 p->state = ORDER_EXEC;
1657 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1658 gfc_ascii_statement (st));
1661 /* All is well, record the statement in case we need it next time. */
1662 p->where = gfc_current_locus;
1663 p->last_statement = st;
1668 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1669 gfc_ascii_statement (st),
1670 gfc_ascii_statement (p->last_statement), &p->where);
1676 /* Handle an unexpected end of file. This is a show-stopper... */
1678 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1681 unexpected_eof (void)
1685 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1687 /* Memory cleanup. Move to "second to last". */
1688 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1691 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1694 longjmp (eof_buf, 1);
1698 /* Parse the CONTAINS section of a derived type definition. */
1700 gfc_access gfc_typebound_default_access;
1703 parse_derived_contains (void)
1706 bool seen_private = false;
1707 bool seen_comps = false;
1708 bool error_flag = false;
1711 gcc_assert (gfc_current_state () == COMP_DERIVED);
1712 gcc_assert (gfc_current_block ());
1714 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1716 if (gfc_current_block ()->attr.sequence)
1717 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1718 " section at %C", gfc_current_block ()->name);
1719 if (gfc_current_block ()->attr.is_bind_c)
1720 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1721 " section at %C", gfc_current_block ()->name);
1723 accept_statement (ST_CONTAINS);
1724 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1726 gfc_typebound_default_access = ACCESS_PUBLIC;
1732 st = next_statement ();
1740 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1745 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1746 " procedure at %C") == FAILURE)
1749 accept_statement (ST_PROCEDURE);
1754 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1755 " at %C") == FAILURE)
1758 accept_statement (ST_GENERIC);
1763 if (gfc_notify_std (GFC_STD_F2003,
1764 "Fortran 2003: FINAL procedure declaration"
1765 " at %C") == FAILURE)
1768 accept_statement (ST_FINAL);
1776 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1777 "definition at %C with empty CONTAINS "
1778 "section") == FAILURE))
1781 /* ST_END_TYPE is accepted by parse_derived after return. */
1785 if (gfc_find_state (COMP_MODULE) == FAILURE)
1787 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1795 gfc_error ("PRIVATE statement at %C must precede procedure"
1803 gfc_error ("Duplicate PRIVATE statement at %C");
1807 accept_statement (ST_PRIVATE);
1808 gfc_typebound_default_access = ACCESS_PRIVATE;
1809 seen_private = true;
1813 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1818 gfc_error ("Already inside a CONTAINS block at %C");
1823 unexpected_statement (st);
1829 gcc_assert (gfc_current_state () == COMP_DERIVED);
1835 /* Parse a derived type. */
1838 parse_derived (void)
1840 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1843 gfc_symbol *derived_sym = NULL;
1849 accept_statement (ST_DERIVED_DECL);
1850 push_state (&s, COMP_DERIVED, gfc_new_block);
1852 gfc_new_block->component_access = ACCESS_PUBLIC;
1859 while (compiling_type)
1861 st = next_statement ();
1868 accept_statement (st);
1873 gfc_error ("PROCEDURE binding at %C must be inside CONTAINS");
1878 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1887 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1888 "definition at %C without components")
1892 accept_statement (ST_END_TYPE);
1896 if (gfc_find_state (COMP_MODULE) == FAILURE)
1898 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1906 gfc_error ("PRIVATE statement at %C must precede "
1907 "structure components");
1914 gfc_error ("Duplicate PRIVATE statement at %C");
1918 s.sym->component_access = ACCESS_PRIVATE;
1920 accept_statement (ST_PRIVATE);
1927 gfc_error ("SEQUENCE statement at %C must precede "
1928 "structure components");
1933 if (gfc_current_block ()->attr.sequence)
1934 gfc_warning ("SEQUENCE attribute at %C already specified in "
1939 gfc_error ("Duplicate SEQUENCE statement at %C");
1944 gfc_add_sequence (&gfc_current_block ()->attr,
1945 gfc_current_block ()->name, NULL);
1949 if (gfc_notify_std (GFC_STD_F2003,
1950 "Fortran 2003: CONTAINS block in derived type"
1951 " definition at %C") == FAILURE)
1954 accept_statement (ST_CONTAINS);
1955 if (parse_derived_contains ())
1960 unexpected_statement (st);
1965 /* need to verify that all fields of the derived type are
1966 * interoperable with C if the type is declared to be bind(c)
1968 derived_sym = gfc_current_block();
1970 sym = gfc_current_block ();
1971 for (c = sym->components; c; c = c->next)
1973 /* Look for allocatable components. */
1974 if (c->attr.allocatable
1975 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1977 sym->attr.alloc_comp = 1;
1981 /* Look for pointer components. */
1983 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1985 sym->attr.pointer_comp = 1;
1989 /* Look for private components. */
1990 if (sym->component_access == ACCESS_PRIVATE
1991 || c->attr.access == ACCESS_PRIVATE
1992 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
1994 sym->attr.private_comp = 1;
1999 if (!seen_component)
2000 sym->attr.zero_comp = 1;
2006 /* Parse an ENUM. */
2015 int seen_enumerator = 0;
2019 push_state (&s, COMP_ENUM, gfc_new_block);
2023 while (compiling_enum)
2025 st = next_statement ();
2033 seen_enumerator = 1;
2034 accept_statement (st);
2039 if (!seen_enumerator)
2041 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2044 accept_statement (st);
2048 gfc_free_enum_history ();
2049 unexpected_statement (st);
2057 /* Parse an interface. We must be able to deal with the possibility
2058 of recursive interfaces. The parse_spec() subroutine is mutually
2059 recursive with parse_interface(). */
2061 static gfc_statement parse_spec (gfc_statement);
2064 parse_interface (void)
2066 gfc_compile_state new_state = COMP_NONE, current_state;
2067 gfc_symbol *prog_unit, *sym;
2068 gfc_interface_info save;
2069 gfc_state_data s1, s2;
2073 accept_statement (ST_INTERFACE);
2075 current_interface.ns = gfc_current_ns;
2076 save = current_interface;
2078 sym = (current_interface.type == INTERFACE_GENERIC
2079 || current_interface.type == INTERFACE_USER_OP)
2080 ? gfc_new_block : NULL;
2082 push_state (&s1, COMP_INTERFACE, sym);
2083 current_state = COMP_NONE;
2086 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2088 st = next_statement ();
2096 if (st == ST_SUBROUTINE)
2097 new_state = COMP_SUBROUTINE;
2098 else if (st == ST_FUNCTION)
2099 new_state = COMP_FUNCTION;
2100 if (gfc_new_block->attr.pointer)
2102 gfc_new_block->attr.pointer = 0;
2103 gfc_new_block->attr.proc_pointer = 1;
2105 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2106 gfc_new_block->formal, NULL) == FAILURE)
2108 reject_statement ();
2109 gfc_free_namespace (gfc_current_ns);
2112 if (current_interface.type != INTERFACE_ABSTRACT &&
2113 !gfc_new_block->attr.dummy &&
2114 gfc_add_external (&gfc_new_block->attr, &gfc_current_locus) == FAILURE)
2116 reject_statement ();
2117 gfc_free_namespace (gfc_current_ns);
2123 case ST_MODULE_PROC: /* The module procedure matcher makes
2124 sure the context is correct. */
2125 accept_statement (st);
2126 gfc_free_namespace (gfc_current_ns);
2129 case ST_END_INTERFACE:
2130 gfc_free_namespace (gfc_current_ns);
2131 gfc_current_ns = current_interface.ns;
2135 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2136 gfc_ascii_statement (st));
2137 reject_statement ();
2138 gfc_free_namespace (gfc_current_ns);
2143 /* Make sure that a generic interface has only subroutines or
2144 functions and that the generic name has the right attribute. */
2145 if (current_interface.type == INTERFACE_GENERIC)
2147 if (current_state == COMP_NONE)
2149 if (new_state == COMP_FUNCTION)
2150 gfc_add_function (&sym->attr, sym->name, NULL);
2151 else if (new_state == COMP_SUBROUTINE)
2152 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2154 current_state = new_state;
2158 if (new_state != current_state)
2160 if (new_state == COMP_SUBROUTINE)
2161 gfc_error ("SUBROUTINE at %C does not belong in a "
2162 "generic function interface");
2164 if (new_state == COMP_FUNCTION)
2165 gfc_error ("FUNCTION at %C does not belong in a "
2166 "generic subroutine interface");
2171 if (current_interface.type == INTERFACE_ABSTRACT)
2173 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2174 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2175 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2176 "cannot be the same as an intrinsic type",
2177 gfc_new_block->name);
2180 push_state (&s2, new_state, gfc_new_block);
2181 accept_statement (st);
2182 prog_unit = gfc_new_block;
2183 prog_unit->formal_ns = gfc_current_ns;
2184 proc_locus = gfc_current_locus;
2187 /* Read data declaration statements. */
2188 st = parse_spec (ST_NONE);
2190 /* Since the interface block does not permit an IMPLICIT statement,
2191 the default type for the function or the result must be taken
2192 from the formal namespace. */
2193 if (new_state == COMP_FUNCTION)
2195 if (prog_unit->result == prog_unit
2196 && prog_unit->ts.type == BT_UNKNOWN)
2197 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2198 else if (prog_unit->result != prog_unit
2199 && prog_unit->result->ts.type == BT_UNKNOWN)
2200 gfc_set_default_type (prog_unit->result, 1,
2201 prog_unit->formal_ns);
2204 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2206 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2207 gfc_ascii_statement (st));
2208 reject_statement ();
2212 current_interface = save;
2213 gfc_add_interface (prog_unit);
2216 if (current_interface.ns
2217 && current_interface.ns->proc_name
2218 && strcmp (current_interface.ns->proc_name->name,
2219 prog_unit->name) == 0)
2220 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2221 "enclosing procedure", prog_unit->name, &proc_locus);
2230 /* Associate function characteristics by going back to the function
2231 declaration and rematching the prefix. */
2234 match_deferred_characteristics (gfc_typespec * ts)
2237 match m = MATCH_ERROR;
2238 char name[GFC_MAX_SYMBOL_LEN + 1];
2240 loc = gfc_current_locus;
2242 gfc_current_locus = gfc_current_block ()->declared_at;
2245 gfc_buffer_error (1);
2246 m = gfc_match_prefix (ts);
2247 gfc_buffer_error (0);
2249 if (ts->type == BT_DERIVED)
2253 if (!ts->derived || !ts->derived->components)
2257 /* Only permit one go at the characteristic association. */
2261 /* Set the function locus correctly. If we have not found the
2262 function name, there is an error. */
2263 gfc_match ("function% %n", name);
2264 if (m == MATCH_YES && strcmp (name, gfc_current_block ()->name) == 0)
2266 gfc_current_block ()->declared_at = gfc_current_locus;
2267 gfc_commit_symbols ();
2272 gfc_current_locus =loc;
2277 /* Check specification-expressions in the function result of the currently
2278 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2279 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2280 scope are not yet parsed so this has to be delayed up to parse_spec. */
2283 check_function_result_typed (void)
2285 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2287 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2288 gcc_assert (ts->type != BT_UNKNOWN);
2290 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2291 /* TODO: Extend when KIND type parameters are implemented. */
2292 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2293 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2297 /* Parse a set of specification statements. Returns the statement
2298 that doesn't fit. */
2300 static gfc_statement
2301 parse_spec (gfc_statement st)
2304 bool function_result_typed = false;
2305 bool bad_characteristic = false;
2308 verify_st_order (&ss, ST_NONE, false);
2310 st = next_statement ();
2312 /* If we are not inside a function or don't have a result specified so far,
2313 do nothing special about it. */
2314 if (gfc_current_state () != COMP_FUNCTION)
2315 function_result_typed = true;
2318 gfc_symbol* proc = gfc_current_ns->proc_name;
2321 if (proc->result->ts.type == BT_UNKNOWN)
2322 function_result_typed = true;
2327 /* If we find a statement that can not be followed by an IMPLICIT statement
2328 (and thus we can expect to see none any further), type the function result
2329 if it has not yet been typed. Be careful not to give the END statement
2330 to verify_st_order! */
2331 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2333 bool verify_now = false;
2335 if (st == ST_END_FUNCTION)
2340 verify_st_order (&dummyss, ST_NONE, false);
2341 verify_st_order (&dummyss, st, false);
2343 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2349 check_function_result_typed ();
2350 function_result_typed = true;
2359 case ST_IMPLICIT_NONE:
2361 if (!function_result_typed)
2363 check_function_result_typed ();
2364 function_result_typed = true;
2370 case ST_DATA: /* Not allowed in interfaces */
2371 if (gfc_current_state () == COMP_INTERFACE)
2381 case ST_DERIVED_DECL:
2384 if (verify_st_order (&ss, st, false) == FAILURE)
2386 reject_statement ();
2387 st = next_statement ();
2397 case ST_DERIVED_DECL:
2403 if (gfc_current_state () != COMP_MODULE)
2405 gfc_error ("%s statement must appear in a MODULE",
2406 gfc_ascii_statement (st));
2410 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2412 gfc_error ("%s statement at %C follows another accessibility "
2413 "specification", gfc_ascii_statement (st));
2417 gfc_current_ns->default_access = (st == ST_PUBLIC)
2418 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2422 case ST_STATEMENT_FUNCTION:
2423 if (gfc_current_state () == COMP_MODULE)
2425 unexpected_statement (st);
2433 accept_statement (st);
2434 st = next_statement ();
2438 accept_statement (st);
2440 st = next_statement ();
2443 case ST_GET_FCN_CHARACTERISTICS:
2444 /* This statement triggers the association of a function's result
2446 ts = &gfc_current_block ()->result->ts;
2447 if (match_deferred_characteristics (ts) != MATCH_YES)
2448 bad_characteristic = true;
2450 st = next_statement ();
2457 /* If match_deferred_characteristics failed, then there is an error. */
2458 if (bad_characteristic)
2460 ts = &gfc_current_block ()->result->ts;
2461 if (ts->type != BT_DERIVED)
2462 gfc_error ("Bad kind expression for function '%s' at %L",
2463 gfc_current_block ()->name,
2464 &gfc_current_block ()->declared_at);
2466 gfc_error ("The type for function '%s' at %L is not accessible",
2467 gfc_current_block ()->name,
2468 &gfc_current_block ()->declared_at);
2470 gfc_current_block ()->ts.kind = 0;
2471 /* Keep the derived type; if it's bad, it will be discovered later. */
2472 if (!(ts->type == BT_DERIVED && ts->derived))
2473 ts->type = BT_UNKNOWN;
2480 /* Parse a WHERE block, (not a simple WHERE statement). */
2483 parse_where_block (void)
2485 int seen_empty_else;
2490 accept_statement (ST_WHERE_BLOCK);
2491 top = gfc_state_stack->tail;
2493 push_state (&s, COMP_WHERE, gfc_new_block);
2495 d = add_statement ();
2496 d->expr = top->expr;
2502 seen_empty_else = 0;
2506 st = next_statement ();
2512 case ST_WHERE_BLOCK:
2513 parse_where_block ();
2518 accept_statement (st);
2522 if (seen_empty_else)
2524 gfc_error ("ELSEWHERE statement at %C follows previous "
2525 "unmasked ELSEWHERE");
2529 if (new_st.expr == NULL)
2530 seen_empty_else = 1;
2532 d = new_level (gfc_state_stack->head);
2534 d->expr = new_st.expr;
2536 accept_statement (st);
2541 accept_statement (st);
2545 gfc_error ("Unexpected %s statement in WHERE block at %C",
2546 gfc_ascii_statement (st));
2547 reject_statement ();
2551 while (st != ST_END_WHERE);
2557 /* Parse a FORALL block (not a simple FORALL statement). */
2560 parse_forall_block (void)
2566 accept_statement (ST_FORALL_BLOCK);
2567 top = gfc_state_stack->tail;
2569 push_state (&s, COMP_FORALL, gfc_new_block);
2571 d = add_statement ();
2572 d->op = EXEC_FORALL;
2577 st = next_statement ();
2582 case ST_POINTER_ASSIGNMENT:
2585 accept_statement (st);
2588 case ST_WHERE_BLOCK:
2589 parse_where_block ();
2592 case ST_FORALL_BLOCK:
2593 parse_forall_block ();
2597 accept_statement (st);
2604 gfc_error ("Unexpected %s statement in FORALL block at %C",
2605 gfc_ascii_statement (st));
2607 reject_statement ();
2611 while (st != ST_END_FORALL);
2617 static gfc_statement parse_executable (gfc_statement);
2619 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2622 parse_if_block (void)
2631 accept_statement (ST_IF_BLOCK);
2633 top = gfc_state_stack->tail;
2634 push_state (&s, COMP_IF, gfc_new_block);
2636 new_st.op = EXEC_IF;
2637 d = add_statement ();
2639 d->expr = top->expr;
2645 st = parse_executable (ST_NONE);
2655 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2656 "statement at %L", &else_locus);
2658 reject_statement ();
2662 d = new_level (gfc_state_stack->head);
2664 d->expr = new_st.expr;
2666 accept_statement (st);
2673 gfc_error ("Duplicate ELSE statements at %L and %C",
2675 reject_statement ();
2680 else_locus = gfc_current_locus;
2682 d = new_level (gfc_state_stack->head);
2685 accept_statement (st);
2693 unexpected_statement (st);
2697 while (st != ST_ENDIF);
2700 accept_statement (st);
2704 /* Parse a SELECT block. */
2707 parse_select_block (void)
2713 accept_statement (ST_SELECT_CASE);
2715 cp = gfc_state_stack->tail;
2716 push_state (&s, COMP_SELECT, gfc_new_block);
2718 /* Make sure that the next statement is a CASE or END SELECT. */
2721 st = next_statement ();
2724 if (st == ST_END_SELECT)
2726 /* Empty SELECT CASE is OK. */
2727 accept_statement (st);
2734 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2737 reject_statement ();
2740 /* At this point, we're got a nonempty select block. */
2741 cp = new_level (cp);
2744 accept_statement (st);
2748 st = parse_executable (ST_NONE);
2755 cp = new_level (gfc_state_stack->head);
2757 gfc_clear_new_st ();
2759 accept_statement (st);
2765 /* Can't have an executable statement because of
2766 parse_executable(). */
2768 unexpected_statement (st);
2772 while (st != ST_END_SELECT);
2775 accept_statement (st);
2779 /* Given a symbol, make sure it is not an iteration variable for a DO
2780 statement. This subroutine is called when the symbol is seen in a
2781 context that causes it to become redefined. If the symbol is an
2782 iterator, we generate an error message and return nonzero. */
2785 gfc_check_do_variable (gfc_symtree *st)
2789 for (s=gfc_state_stack; s; s = s->previous)
2790 if (s->do_variable == st)
2792 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2793 "loop beginning at %L", st->name, &s->head->loc);
2801 /* Checks to see if the current statement label closes an enddo.
2802 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2803 an error) if it incorrectly closes an ENDDO. */
2806 check_do_closure (void)
2810 if (gfc_statement_label == NULL)
2813 for (p = gfc_state_stack; p; p = p->previous)
2814 if (p->state == COMP_DO)
2818 return 0; /* No loops to close */
2820 if (p->ext.end_do_label == gfc_statement_label)
2823 if (p == gfc_state_stack)
2826 gfc_error ("End of nonblock DO statement at %C is within another block");
2830 /* At this point, the label doesn't terminate the innermost loop.
2831 Make sure it doesn't terminate another one. */
2832 for (; p; p = p->previous)
2833 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2835 gfc_error ("End of nonblock DO statement at %C is interwoven "
2836 "with another DO loop");
2844 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2845 handled inside of parse_executable(), because they aren't really
2849 parse_do_block (void)
2856 s.ext.end_do_label = new_st.label;
2858 if (new_st.ext.iterator != NULL)
2859 stree = new_st.ext.iterator->var->symtree;
2863 accept_statement (ST_DO);
2865 top = gfc_state_stack->tail;
2866 push_state (&s, COMP_DO, gfc_new_block);
2868 s.do_variable = stree;
2870 top->block = new_level (top);
2871 top->block->op = EXEC_DO;
2874 st = parse_executable (ST_NONE);
2882 if (s.ext.end_do_label != NULL
2883 && s.ext.end_do_label != gfc_statement_label)
2884 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2887 if (gfc_statement_label != NULL)
2889 new_st.op = EXEC_NOP;
2894 case ST_IMPLIED_ENDDO:
2895 /* If the do-stmt of this DO construct has a do-construct-name,
2896 the corresponding end-do must be an end-do-stmt (with a matching
2897 name, but in that case we must have seen ST_ENDDO first).
2898 We only complain about this in pedantic mode. */
2899 if (gfc_current_block () != NULL)
2900 gfc_error_now ("named block DO at %L requires matching ENDDO name",
2901 &gfc_current_block()->declared_at);
2906 unexpected_statement (st);
2911 accept_statement (st);
2915 /* Parse the statements of OpenMP do/parallel do. */
2917 static gfc_statement
2918 parse_omp_do (gfc_statement omp_st)
2924 accept_statement (omp_st);
2926 cp = gfc_state_stack->tail;
2927 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2928 np = new_level (cp);
2934 st = next_statement ();
2937 else if (st == ST_DO)
2940 unexpected_statement (st);
2944 if (gfc_statement_label != NULL
2945 && gfc_state_stack->previous != NULL
2946 && gfc_state_stack->previous->state == COMP_DO
2947 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2955 there should be no !$OMP END DO. */
2957 return ST_IMPLIED_ENDDO;
2960 check_do_closure ();
2963 st = next_statement ();
2964 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2966 if (new_st.op == EXEC_OMP_END_NOWAIT)
2967 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2969 gcc_assert (new_st.op == EXEC_NOP);
2970 gfc_clear_new_st ();
2971 gfc_commit_symbols ();
2972 gfc_warning_check ();
2973 st = next_statement ();
2979 /* Parse the statements of OpenMP atomic directive. */
2982 parse_omp_atomic (void)
2988 accept_statement (ST_OMP_ATOMIC);
2990 cp = gfc_state_stack->tail;
2991 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2992 np = new_level (cp);
2998 st = next_statement ();
3001 else if (st == ST_ASSIGNMENT)
3004 unexpected_statement (st);
3007 accept_statement (st);
3013 /* Parse the statements of an OpenMP structured block. */
3016 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3018 gfc_statement st, omp_end_st;
3022 accept_statement (omp_st);
3024 cp = gfc_state_stack->tail;
3025 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3026 np = new_level (cp);
3032 case ST_OMP_PARALLEL:
3033 omp_end_st = ST_OMP_END_PARALLEL;
3035 case ST_OMP_PARALLEL_SECTIONS:
3036 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3038 case ST_OMP_SECTIONS:
3039 omp_end_st = ST_OMP_END_SECTIONS;
3041 case ST_OMP_ORDERED:
3042 omp_end_st = ST_OMP_END_ORDERED;
3044 case ST_OMP_CRITICAL:
3045 omp_end_st = ST_OMP_END_CRITICAL;
3048 omp_end_st = ST_OMP_END_MASTER;
3051 omp_end_st = ST_OMP_END_SINGLE;
3054 omp_end_st = ST_OMP_END_TASK;
3056 case ST_OMP_WORKSHARE:
3057 omp_end_st = ST_OMP_END_WORKSHARE;
3059 case ST_OMP_PARALLEL_WORKSHARE:
3060 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3068 if (workshare_stmts_only)
3070 /* Inside of !$omp workshare, only
3073 where statements and constructs
3074 forall statements and constructs
3078 are allowed. For !$omp critical these
3079 restrictions apply recursively. */
3082 st = next_statement ();
3093 accept_statement (st);
3096 case ST_WHERE_BLOCK:
3097 parse_where_block ();
3100 case ST_FORALL_BLOCK:
3101 parse_forall_block ();
3104 case ST_OMP_PARALLEL:
3105 case ST_OMP_PARALLEL_SECTIONS:
3106 parse_omp_structured_block (st, false);
3109 case ST_OMP_PARALLEL_WORKSHARE:
3110 case ST_OMP_CRITICAL:
3111 parse_omp_structured_block (st, true);
3114 case ST_OMP_PARALLEL_DO:
3115 st = parse_omp_do (st);
3119 parse_omp_atomic ();
3130 st = next_statement ();
3134 st = parse_executable (ST_NONE);
3137 else if (st == ST_OMP_SECTION
3138 && (omp_st == ST_OMP_SECTIONS
3139 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3141 np = new_level (np);
3145 else if (st != omp_end_st)
3146 unexpected_statement (st);
3148 while (st != omp_end_st);
3152 case EXEC_OMP_END_NOWAIT:
3153 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3155 case EXEC_OMP_CRITICAL:
3156 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3157 || (new_st.ext.omp_name != NULL
3158 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3159 gfc_error ("Name after !$omp critical and !$omp end critical does "
3161 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3163 case EXEC_OMP_END_SINGLE:
3164 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3165 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3166 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3167 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3175 gfc_clear_new_st ();
3176 gfc_commit_symbols ();
3177 gfc_warning_check ();
3182 /* Accept a series of executable statements. We return the first
3183 statement that doesn't fit to the caller. Any block statements are
3184 passed on to the correct handler, which usually passes the buck
3187 static gfc_statement
3188 parse_executable (gfc_statement st)
3193 st = next_statement ();
3197 close_flag = check_do_closure ();
3202 case ST_END_PROGRAM:
3205 case ST_END_FUNCTION:
3209 case ST_END_SUBROUTINE:
3214 case ST_SELECT_CASE:
3215 gfc_error ("%s statement at %C cannot terminate a non-block "
3216 "DO loop", gfc_ascii_statement (st));
3232 accept_statement (st);
3233 if (close_flag == 1)
3234 return ST_IMPLIED_ENDDO;
3241 case ST_SELECT_CASE:
3242 parse_select_block ();
3247 if (check_do_closure () == 1)
3248 return ST_IMPLIED_ENDDO;
3251 case ST_WHERE_BLOCK:
3252 parse_where_block ();
3255 case ST_FORALL_BLOCK:
3256 parse_forall_block ();
3259 case ST_OMP_PARALLEL:
3260 case ST_OMP_PARALLEL_SECTIONS:
3261 case ST_OMP_SECTIONS:
3262 case ST_OMP_ORDERED:
3263 case ST_OMP_CRITICAL:
3267 parse_omp_structured_block (st, false);
3270 case ST_OMP_WORKSHARE:
3271 case ST_OMP_PARALLEL_WORKSHARE:
3272 parse_omp_structured_block (st, true);
3276 case ST_OMP_PARALLEL_DO:
3277 st = parse_omp_do (st);
3278 if (st == ST_IMPLIED_ENDDO)
3283 parse_omp_atomic ();
3290 st = next_statement ();
3295 /* Parse a series of contained program units. */
3297 static void parse_progunit (gfc_statement);
3300 /* Fix the symbols for sibling functions. These are incorrectly added to
3301 the child namespace as the parser didn't know about this procedure. */
3304 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3308 gfc_symbol *old_sym;
3310 sym->attr.referenced = 1;
3311 for (ns = siblings; ns; ns = ns->sibling)
3313 gfc_find_sym_tree (sym->name, ns, 0, &st);
3315 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3318 old_sym = st->n.sym;
3319 if (old_sym->ns == ns
3320 && !old_sym->attr.contained
3322 /* By 14.6.1.3, host association should be excluded
3323 for the following. */
3324 && !(old_sym->attr.external
3325 || (old_sym->ts.type != BT_UNKNOWN
3326 && !old_sym->attr.implicit_type)
3327 || old_sym->attr.flavor == FL_PARAMETER
3328 || old_sym->attr.in_common
3329 || old_sym->attr.in_equivalence
3330 || old_sym->attr.data
3331 || old_sym->attr.dummy
3332 || old_sym->attr.result
3333 || old_sym->attr.dimension
3334 || old_sym->attr.allocatable
3335 || old_sym->attr.intrinsic
3336 || old_sym->attr.generic
3337 || old_sym->attr.flavor == FL_NAMELIST
3338 || old_sym->attr.proc == PROC_ST_FUNCTION))
3340 /* Replace it with the symbol from the parent namespace. */
3344 /* Free the old (local) symbol. */
3346 if (old_sym->refs == 0)
3347 gfc_free_symbol (old_sym);
3350 /* Do the same for any contained procedures. */
3351 gfc_fixup_sibling_symbols (sym, ns->contained);
3356 parse_contained (int module)
3358 gfc_namespace *ns, *parent_ns, *tmp;
3359 gfc_state_data s1, s2;
3363 int contains_statements = 0;
3366 push_state (&s1, COMP_CONTAINS, NULL);
3367 parent_ns = gfc_current_ns;
3371 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3373 gfc_current_ns->sibling = parent_ns->contained;
3374 parent_ns->contained = gfc_current_ns;
3377 /* Process the next available statement. We come here if we got an error
3378 and rejected the last statement. */
3379 st = next_statement ();
3388 contains_statements = 1;
3389 accept_statement (st);
3392 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3395 /* For internal procedures, create/update the symbol in the
3396 parent namespace. */
3400 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3401 gfc_error ("Contained procedure '%s' at %C is already "
3402 "ambiguous", gfc_new_block->name);
3405 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3406 &gfc_new_block->declared_at) ==
3409 if (st == ST_FUNCTION)
3410 gfc_add_function (&sym->attr, sym->name,
3411 &gfc_new_block->declared_at);
3413 gfc_add_subroutine (&sym->attr, sym->name,
3414 &gfc_new_block->declared_at);
3418 gfc_commit_symbols ();
3421 sym = gfc_new_block;
3423 /* Mark this as a contained function, so it isn't replaced
3424 by other module functions. */
3425 sym->attr.contained = 1;
3426 sym->attr.referenced = 1;
3428 parse_progunit (ST_NONE);
3430 /* Fix up any sibling functions that refer to this one. */
3431 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3432 /* Or refer to any of its alternate entry points. */
3433 for (el = gfc_current_ns->entries; el; el = el->next)
3434 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3436 gfc_current_ns->code = s2.head;
3437 gfc_current_ns = parent_ns;
3442 /* These statements are associated with the end of the host unit. */
3443 case ST_END_FUNCTION:
3445 case ST_END_PROGRAM:
3446 case ST_END_SUBROUTINE:
3447 accept_statement (st);
3451 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3452 gfc_ascii_statement (st));
3453 reject_statement ();
3459 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3460 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3462 /* The first namespace in the list is guaranteed to not have
3463 anything (worthwhile) in it. */
3464 tmp = gfc_current_ns;
3465 gfc_current_ns = parent_ns;
3466 if (seen_error && tmp->refs > 1)
3467 gfc_free_namespace (tmp);
3469 ns = gfc_current_ns->contained;
3470 gfc_current_ns->contained = ns->sibling;
3471 gfc_free_namespace (ns);
3474 if (!contains_statements)
3475 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3476 "FUNCTION or SUBROUTINE statement at %C");
3480 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3483 parse_progunit (gfc_statement st)
3488 st = parse_spec (st);
3498 accept_statement (st);
3505 if (gfc_current_state () == COMP_FUNCTION)
3506 gfc_check_function_type (gfc_current_ns);
3511 st = parse_executable (st);
3522 accept_statement (st);
3529 unexpected_statement (st);
3530 reject_statement ();
3531 st = next_statement ();
3537 for (p = gfc_state_stack; p; p = p->previous)
3538 if (p->state == COMP_CONTAINS)
3541 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3546 gfc_error ("CONTAINS statement at %C is already in a contained "
3548 st = next_statement ();
3552 parse_contained (0);
3555 gfc_current_ns->code = gfc_state_stack->head;
3559 /* Come here to complain about a global symbol already in use as
3563 gfc_global_used (gfc_gsymbol *sym, locus *where)
3568 where = &gfc_current_locus;
3578 case GSYM_SUBROUTINE:
3579 name = "SUBROUTINE";
3584 case GSYM_BLOCK_DATA:
3585 name = "BLOCK DATA";
3591 gfc_internal_error ("gfc_global_used(): Bad type");
3595 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3596 sym->name, where, name, &sym->where);
3600 /* Parse a block data program unit. */
3603 parse_block_data (void)
3606 static locus blank_locus;
3607 static int blank_block=0;
3610 gfc_current_ns->proc_name = gfc_new_block;
3611 gfc_current_ns->is_block_data = 1;
3613 if (gfc_new_block == NULL)
3616 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3617 "prior BLOCK DATA at %L", &blank_locus);
3621 blank_locus = gfc_current_locus;
3626 s = gfc_get_gsymbol (gfc_new_block->name);
3628 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3629 gfc_global_used(s, NULL);
3632 s->type = GSYM_BLOCK_DATA;
3633 s->where = gfc_current_locus;
3638 st = parse_spec (ST_NONE);
3640 while (st != ST_END_BLOCK_DATA)
3642 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3643 gfc_ascii_statement (st));
3644 reject_statement ();
3645 st = next_statement ();
3650 /* Parse a module subprogram. */
3658 s = gfc_get_gsymbol (gfc_new_block->name);
3659 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3660 gfc_global_used(s, NULL);
3663 s->type = GSYM_MODULE;
3664 s->where = gfc_current_locus;
3668 st = parse_spec (ST_NONE);
3677 parse_contained (1);
3681 accept_statement (st);
3685 gfc_error ("Unexpected %s statement in MODULE at %C",
3686 gfc_ascii_statement (st));
3688 reject_statement ();
3689 st = next_statement ();
3695 /* Add a procedure name to the global symbol table. */
3698 add_global_procedure (int sub)
3702 s = gfc_get_gsymbol(gfc_new_block->name);
3705 || (s->type != GSYM_UNKNOWN
3706 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3707 gfc_global_used(s, NULL);
3710 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3711 s->where = gfc_current_locus;
3717 /* Add a program to the global symbol table. */
3720 add_global_program (void)
3724 if (gfc_new_block == NULL)
3726 s = gfc_get_gsymbol (gfc_new_block->name);
3728 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3729 gfc_global_used(s, NULL);
3732 s->type = GSYM_PROGRAM;
3733 s->where = gfc_current_locus;
3739 /* Top level parser. */
3742 gfc_parse_file (void)
3744 int seen_program, errors_before, errors;
3745 gfc_state_data top, s;
3749 gfc_start_source_files ();
3751 top.state = COMP_NONE;
3753 top.previous = NULL;
3754 top.head = top.tail = NULL;
3755 top.do_variable = NULL;
3757 gfc_state_stack = ⊤
3759 gfc_clear_new_st ();
3761 gfc_statement_label = NULL;
3763 if (setjmp (eof_buf))
3764 return FAILURE; /* Come here on unexpected EOF */
3768 /* Exit early for empty files. */
3774 st = next_statement ();
3783 goto duplicate_main;
3785 prog_locus = gfc_current_locus;
3787 push_state (&s, COMP_PROGRAM, gfc_new_block);
3788 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3789 accept_statement (st);
3790 add_global_program ();
3791 parse_progunit (ST_NONE);
3795 add_global_procedure (1);
3796 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3797 accept_statement (st);
3798 parse_progunit (ST_NONE);
3802 add_global_procedure (0);
3803 push_state (&s, COMP_FUNCTION, gfc_new_block);
3804 accept_statement (st);
3805 parse_progunit (ST_NONE);
3809 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3810 accept_statement (st);
3811 parse_block_data ();
3815 push_state (&s, COMP_MODULE, gfc_new_block);
3816 accept_statement (st);
3818 gfc_get_errors (NULL, &errors_before);
3822 /* Anything else starts a nameless main program block. */
3825 goto duplicate_main;
3827 prog_locus = gfc_current_locus;
3829 push_state (&s, COMP_PROGRAM, gfc_new_block);
3830 main_program_symbol (gfc_current_ns, "MAIN__");
3831 parse_progunit (st);
3835 gfc_current_ns->code = s.head;
3837 gfc_resolve (gfc_current_ns);
3839 /* Dump the parse tree if requested. */
3840 if (gfc_option.dump_parse_tree)
3841 gfc_dump_parse_tree (gfc_current_ns, stdout);
3843 gfc_get_errors (NULL, &errors);
3844 if (s.state == COMP_MODULE)
3846 gfc_dump_module (s.sym->name, errors_before == errors);
3848 gfc_generate_module_code (gfc_current_ns);
3853 gfc_generate_code (gfc_current_ns);
3861 gfc_end_source_files ();
3865 /* If we see a duplicate main program, shut down. If the second
3866 instance is an implied main program, i.e. data decls or executable
3867 statements, we're in for lots of errors. */
3868 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3869 reject_statement ();