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 ("go to", gfc_match_goto, ST_GOTO);
379 match ("inquire", gfc_match_inquire, ST_INQUIRE);
380 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
381 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
382 match ("import", gfc_match_import, ST_IMPORT);
383 match ("interface", gfc_match_interface, ST_INTERFACE);
384 match ("intent", gfc_match_intent, ST_ATTR_DECL);
385 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
389 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
390 match ("module", gfc_match_module, ST_MODULE);
394 match ("nullify", gfc_match_nullify, ST_NULLIFY);
395 match ("namelist", gfc_match_namelist, ST_NAMELIST);
399 match ("open", gfc_match_open, ST_OPEN);
400 match ("optional", gfc_match_optional, ST_ATTR_DECL);
404 match ("print", gfc_match_print, ST_WRITE);
405 match ("parameter", gfc_match_parameter, ST_PARAMETER);
406 match ("pause", gfc_match_pause, ST_PAUSE);
407 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
408 if (gfc_match_private (&st) == MATCH_YES)
410 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
411 match ("program", gfc_match_program, ST_PROGRAM);
412 if (gfc_match_public (&st) == MATCH_YES)
414 match ("protected", gfc_match_protected, ST_ATTR_DECL);
418 match ("read", gfc_match_read, ST_READ);
419 match ("return", gfc_match_return, ST_RETURN);
420 match ("rewind", gfc_match_rewind, ST_REWIND);
424 match ("sequence", gfc_match_eos, ST_SEQUENCE);
425 match ("stop", gfc_match_stop, ST_STOP);
426 match ("save", gfc_match_save, ST_ATTR_DECL);
430 match ("target", gfc_match_target, ST_ATTR_DECL);
431 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
435 match ("use", gfc_match_use, ST_USE);
439 match ("value", gfc_match_value, ST_ATTR_DECL);
440 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
444 match ("wait", gfc_match_wait, ST_WAIT);
445 match ("write", gfc_match_write, ST_WRITE);
449 /* All else has failed, so give up. See if any of the matchers has
450 stored an error message of some sort. */
452 if (gfc_error_check () == 0)
453 gfc_error_now ("Unclassifiable statement at %C");
457 gfc_error_recovery ();
463 decode_omp_directive (void)
472 gfc_clear_error (); /* Clear any pending errors. */
473 gfc_clear_warning (); /* Clear any pending warnings. */
477 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
478 "or ELEMENTAL procedures");
479 gfc_error_recovery ();
483 old_locus = gfc_current_locus;
485 /* General OpenMP directive matching: Instead of testing every possible
486 statement, we eliminate most possibilities by peeking at the
489 c = gfc_peek_ascii_char ();
494 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
497 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
500 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
503 match ("do", gfc_match_omp_do, ST_OMP_DO);
506 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
507 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
508 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
509 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
510 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
511 match ("end parallel sections", gfc_match_omp_eos,
512 ST_OMP_END_PARALLEL_SECTIONS);
513 match ("end parallel workshare", gfc_match_omp_eos,
514 ST_OMP_END_PARALLEL_WORKSHARE);
515 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
516 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
517 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
518 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
519 match ("end workshare", gfc_match_omp_end_nowait,
520 ST_OMP_END_WORKSHARE);
523 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
526 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
529 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
532 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
533 match ("parallel sections", gfc_match_omp_parallel_sections,
534 ST_OMP_PARALLEL_SECTIONS);
535 match ("parallel workshare", gfc_match_omp_parallel_workshare,
536 ST_OMP_PARALLEL_WORKSHARE);
537 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
540 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
541 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
542 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
545 match ("task", gfc_match_omp_task, ST_OMP_TASK);
546 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
547 match ("threadprivate", gfc_match_omp_threadprivate,
548 ST_OMP_THREADPRIVATE);
550 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
554 /* All else has failed, so give up. See if any of the matchers has
555 stored an error message of some sort. */
557 if (gfc_error_check () == 0)
558 gfc_error_now ("Unclassifiable OpenMP directive at %C");
562 gfc_error_recovery ();
570 /* Get the next statement in free form source. */
579 at_bol = gfc_at_bol ();
580 gfc_gobble_whitespace ();
582 c = gfc_peek_ascii_char ();
588 /* Found a statement label? */
589 m = gfc_match_st_label (&gfc_statement_label);
591 d = gfc_peek_ascii_char ();
592 if (m != MATCH_YES || !gfc_is_whitespace (d))
594 gfc_match_small_literal_int (&i, &cnt);
597 gfc_error_now ("Too many digits in statement label at %C");
600 gfc_error_now ("Zero is not a valid statement label at %C");
603 c = gfc_next_ascii_char ();
606 if (!gfc_is_whitespace (c))
607 gfc_error_now ("Non-numeric character in statement label at %C");
613 label_locus = gfc_current_locus;
615 gfc_gobble_whitespace ();
617 if (at_bol && gfc_peek_ascii_char () == ';')
619 gfc_error_now ("Semicolon at %C needs to be preceded by "
621 gfc_next_ascii_char (); /* Eat up the semicolon. */
625 if (gfc_match_eos () == MATCH_YES)
627 gfc_warning_now ("Ignoring statement label in empty statement "
629 gfc_free_st_label (gfc_statement_label);
630 gfc_statement_label = NULL;
637 /* Comments have already been skipped by the time we get here,
638 except for OpenMP directives. */
639 if (gfc_option.flag_openmp)
643 c = gfc_next_ascii_char ();
644 for (i = 0; i < 5; i++, c = gfc_next_ascii_char ())
645 gcc_assert (c == "!$omp"[i]);
647 gcc_assert (c == ' ' || c == '\t');
648 gfc_gobble_whitespace ();
649 return decode_omp_directive ();
653 if (at_bol && c == ';')
655 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
656 gfc_next_ascii_char (); /* Eat up the semicolon. */
660 return decode_statement ();
664 /* Get the next statement in fixed-form source. */
669 int label, digit_flag, i;
674 return decode_statement ();
676 /* Skip past the current label field, parsing a statement label if
677 one is there. This is a weird number parser, since the number is
678 contained within five columns and can have any kind of embedded
679 spaces. We also check for characters that make the rest of the
685 for (i = 0; i < 5; i++)
687 c = gfc_next_char_literal (0);
704 label = label * 10 + ((unsigned char) c - '0');
705 label_locus = gfc_current_locus;
709 /* Comments have already been skipped by the time we get
710 here, except for OpenMP directives. */
712 if (gfc_option.flag_openmp)
714 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
715 gcc_assert ((char) gfc_wide_tolower (c) == "*$omp"[i]);
717 if (c != ' ' && c != '0')
719 gfc_buffer_error (0);
720 gfc_error ("Bad continuation line at %C");
724 return decode_omp_directive ();
728 /* Comments have already been skipped by the time we get
729 here so don't bother checking for them. */
732 gfc_buffer_error (0);
733 gfc_error ("Non-numeric character in statement label at %C");
741 gfc_warning_now ("Zero is not a valid statement label at %C");
744 /* We've found a valid statement label. */
745 gfc_statement_label = gfc_get_st_label (label);
749 /* Since this line starts a statement, it cannot be a continuation
750 of a previous statement. If we see something here besides a
751 space or zero, it must be a bad continuation line. */
753 c = gfc_next_char_literal (0);
757 if (c != ' ' && c != '0')
759 gfc_buffer_error (0);
760 gfc_error ("Bad continuation line at %C");
764 /* Now that we've taken care of the statement label columns, we have
765 to make sure that the first nonblank character is not a '!'. If
766 it is, the rest of the line is a comment. */
770 loc = gfc_current_locus;
771 c = gfc_next_char_literal (0);
773 while (gfc_is_whitespace (c));
777 gfc_current_locus = loc;
781 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
785 if (gfc_match_eos () == MATCH_YES)
788 /* At this point, we've got a nonblank statement to parse. */
789 return decode_statement ();
793 gfc_warning ("Ignoring statement label in empty statement at %C");
799 /* Return the next non-ST_NONE statement to the caller. We also worry
800 about including files and the ends of include files at this stage. */
803 next_statement (void)
807 gfc_new_block = NULL;
811 gfc_statement_label = NULL;
812 gfc_buffer_error (1);
816 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
817 && gfc_current_locus.lb
818 && gfc_current_locus.lb->truncated)
819 gfc_warning_now ("Line truncated at %C");
824 gfc_skip_comments ();
832 if (gfc_define_undef_line ())
835 old_locus = gfc_current_locus;
837 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
843 gfc_buffer_error (0);
845 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
847 gfc_free_st_label (gfc_statement_label);
848 gfc_statement_label = NULL;
849 gfc_current_locus = old_locus;
853 check_statement_label (st);
859 /****************************** Parser ***********************************/
861 /* The parser subroutines are of type 'try' that fail if the file ends
864 /* Macros that expand to case-labels for various classes of
865 statements. Start with executable statements that directly do
868 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
869 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
870 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
871 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
872 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
873 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
874 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
875 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
876 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
878 /* Statements that mark other executable statements. */
880 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
881 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
882 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
883 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
884 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
885 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
888 /* Declaration statements */
890 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
891 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
892 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
895 /* Block end statements. Errors associated with interchanging these
896 are detected in gfc_match_end(). */
898 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
899 case ST_END_PROGRAM: case ST_END_SUBROUTINE
902 /* Push a new state onto the stack. */
905 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
907 p->state = new_state;
908 p->previous = gfc_state_stack;
910 p->head = p->tail = NULL;
911 p->do_variable = NULL;
916 /* Pop the current state. */
920 gfc_state_stack = gfc_state_stack->previous;
924 /* Try to find the given state in the state stack. */
927 gfc_find_state (gfc_compile_state state)
931 for (p = gfc_state_stack; p; p = p->previous)
932 if (p->state == state)
935 return (p == NULL) ? FAILURE : SUCCESS;
939 /* Starts a new level in the statement list. */
942 new_level (gfc_code *q)
946 p = q->block = gfc_get_code ();
948 gfc_state_stack->head = gfc_state_stack->tail = p;
954 /* Add the current new_st code structure and adds it to the current
955 program unit. As a side-effect, it zeroes the new_st. */
965 p->loc = gfc_current_locus;
967 if (gfc_state_stack->head == NULL)
968 gfc_state_stack->head = p;
970 gfc_state_stack->tail->next = p;
972 while (p->next != NULL)
975 gfc_state_stack->tail = p;
983 /* Frees everything associated with the current statement. */
986 undo_new_statement (void)
988 gfc_free_statements (new_st.block);
989 gfc_free_statements (new_st.next);
990 gfc_free_statement (&new_st);
995 /* If the current statement has a statement label, make sure that it
996 is allowed to, or should have one. */
999 check_statement_label (gfc_statement st)
1003 if (gfc_statement_label == NULL)
1005 if (st == ST_FORMAT)
1006 gfc_error ("FORMAT statement at %L does not have a statement label",
1013 case ST_END_PROGRAM:
1014 case ST_END_FUNCTION:
1015 case ST_END_SUBROUTINE:
1021 type = ST_LABEL_TARGET;
1025 type = ST_LABEL_FORMAT;
1028 /* Statement labels are not restricted from appearing on a
1029 particular line. However, there are plenty of situations
1030 where the resulting label can't be referenced. */
1033 type = ST_LABEL_BAD_TARGET;
1037 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1039 new_st.here = gfc_statement_label;
1043 /* Figures out what the enclosing program unit is. This will be a
1044 function, subroutine, program, block data or module. */
1047 gfc_enclosing_unit (gfc_compile_state * result)
1051 for (p = gfc_state_stack; p; p = p->previous)
1052 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1053 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1054 || p->state == COMP_PROGRAM)
1063 *result = COMP_PROGRAM;
1068 /* Translate a statement enum to a string. */
1071 gfc_ascii_statement (gfc_statement st)
1077 case ST_ARITHMETIC_IF:
1078 p = _("arithmetic IF");
1084 p = _("attribute declaration");
1114 p = _("data declaration");
1122 case ST_DERIVED_DECL:
1123 p = _("derived type declaration");
1137 case ST_END_BLOCK_DATA:
1138 p = "END BLOCK DATA";
1149 case ST_END_FUNCTION:
1155 case ST_END_INTERFACE:
1156 p = "END INTERFACE";
1161 case ST_END_PROGRAM:
1167 case ST_END_SUBROUTINE:
1168 p = "END SUBROUTINE";
1179 case ST_EQUIVALENCE:
1188 case ST_FORALL_BLOCK: /* Fall through */
1207 case ST_IMPLICIT_NONE:
1208 p = "IMPLICIT NONE";
1210 case ST_IMPLIED_ENDDO:
1211 p = _("implied END DO");
1237 case ST_MODULE_PROC:
1238 p = "MODULE PROCEDURE";
1276 case ST_WHERE_BLOCK: /* Fall through */
1287 p = _("assignment");
1289 case ST_POINTER_ASSIGNMENT:
1290 p = _("pointer assignment");
1292 case ST_SELECT_CASE:
1301 case ST_STATEMENT_FUNCTION:
1302 p = "STATEMENT FUNCTION";
1304 case ST_LABEL_ASSIGNMENT:
1305 p = "LABEL ASSIGNMENT";
1308 p = "ENUM DEFINITION";
1311 p = "ENUMERATOR DEFINITION";
1319 case ST_OMP_BARRIER:
1320 p = "!$OMP BARRIER";
1322 case ST_OMP_CRITICAL:
1323 p = "!$OMP CRITICAL";
1328 case ST_OMP_END_CRITICAL:
1329 p = "!$OMP END CRITICAL";
1334 case ST_OMP_END_MASTER:
1335 p = "!$OMP END MASTER";
1337 case ST_OMP_END_ORDERED:
1338 p = "!$OMP END ORDERED";
1340 case ST_OMP_END_PARALLEL:
1341 p = "!$OMP END PARALLEL";
1343 case ST_OMP_END_PARALLEL_DO:
1344 p = "!$OMP END PARALLEL DO";
1346 case ST_OMP_END_PARALLEL_SECTIONS:
1347 p = "!$OMP END PARALLEL SECTIONS";
1349 case ST_OMP_END_PARALLEL_WORKSHARE:
1350 p = "!$OMP END PARALLEL WORKSHARE";
1352 case ST_OMP_END_SECTIONS:
1353 p = "!$OMP END SECTIONS";
1355 case ST_OMP_END_SINGLE:
1356 p = "!$OMP END SINGLE";
1358 case ST_OMP_END_TASK:
1359 p = "!$OMP END TASK";
1361 case ST_OMP_END_WORKSHARE:
1362 p = "!$OMP END WORKSHARE";
1370 case ST_OMP_ORDERED:
1371 p = "!$OMP ORDERED";
1373 case ST_OMP_PARALLEL:
1374 p = "!$OMP PARALLEL";
1376 case ST_OMP_PARALLEL_DO:
1377 p = "!$OMP PARALLEL DO";
1379 case ST_OMP_PARALLEL_SECTIONS:
1380 p = "!$OMP PARALLEL SECTIONS";
1382 case ST_OMP_PARALLEL_WORKSHARE:
1383 p = "!$OMP PARALLEL WORKSHARE";
1385 case ST_OMP_SECTIONS:
1386 p = "!$OMP SECTIONS";
1388 case ST_OMP_SECTION:
1389 p = "!$OMP SECTION";
1397 case ST_OMP_TASKWAIT:
1398 p = "!$OMP TASKWAIT";
1400 case ST_OMP_THREADPRIVATE:
1401 p = "!$OMP THREADPRIVATE";
1403 case ST_OMP_WORKSHARE:
1404 p = "!$OMP WORKSHARE";
1407 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1414 /* Create a symbol for the main program and assign it to ns->proc_name. */
1417 main_program_symbol (gfc_namespace *ns, const char *name)
1419 gfc_symbol *main_program;
1420 symbol_attribute attr;
1422 gfc_get_symbol (name, ns, &main_program);
1423 gfc_clear_attr (&attr);
1424 attr.flavor = FL_PROGRAM;
1425 attr.proc = PROC_UNKNOWN;
1426 attr.subroutine = 1;
1427 attr.access = ACCESS_PUBLIC;
1428 attr.is_main_program = 1;
1429 main_program->attr = attr;
1430 main_program->declared_at = gfc_current_locus;
1431 ns->proc_name = main_program;
1432 gfc_commit_symbols ();
1436 /* Do whatever is necessary to accept the last statement. */
1439 accept_statement (gfc_statement st)
1447 case ST_IMPLICIT_NONE:
1448 gfc_set_implicit_none ();
1457 gfc_current_ns->proc_name = gfc_new_block;
1460 /* If the statement is the end of a block, lay down a special code
1461 that allows a branch to the end of the block from within the
1466 if (gfc_statement_label != NULL)
1468 new_st.op = EXEC_NOP;
1474 /* The end-of-program unit statements do not get the special
1475 marker and require a statement of some sort if they are a
1478 case ST_END_PROGRAM:
1479 case ST_END_FUNCTION:
1480 case ST_END_SUBROUTINE:
1481 if (gfc_statement_label != NULL)
1483 new_st.op = EXEC_RETURN;
1499 gfc_commit_symbols ();
1500 gfc_warning_check ();
1501 gfc_clear_new_st ();
1505 /* Undo anything tentative that has been built for the current
1509 reject_statement (void)
1511 gfc_new_block = NULL;
1512 gfc_undo_symbols ();
1513 gfc_clear_warning ();
1514 undo_new_statement ();
1518 /* Generic complaint about an out of order statement. We also do
1519 whatever is necessary to clean up. */
1522 unexpected_statement (gfc_statement st)
1524 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1526 reject_statement ();
1530 /* Given the next statement seen by the matcher, make sure that it is
1531 in proper order with the last. This subroutine is initialized by
1532 calling it with an argument of ST_NONE. If there is a problem, we
1533 issue an error and return FAILURE. Otherwise we return SUCCESS.
1535 Individual parsers need to verify that the statements seen are
1536 valid before calling here, i.e., ENTRY statements are not allowed in
1537 INTERFACE blocks. The following diagram is taken from the standard:
1539 +---------------------------------------+
1540 | program subroutine function module |
1541 +---------------------------------------+
1543 +---------------------------------------+
1545 +---------------------------------------+
1547 | +-----------+------------------+
1548 | | parameter | implicit |
1549 | +-----------+------------------+
1550 | format | | derived type |
1551 | entry | parameter | interface |
1552 | | data | specification |
1553 | | | statement func |
1554 | +-----------+------------------+
1555 | | data | executable |
1556 +--------+-----------+------------------+
1558 +---------------------------------------+
1559 | internal module/subprogram |
1560 +---------------------------------------+
1562 +---------------------------------------+
1569 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1570 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1573 gfc_statement last_statement;
1579 verify_st_order (st_state *p, gfc_statement st, bool silent)
1585 p->state = ORDER_START;
1589 if (p->state > ORDER_USE)
1591 p->state = ORDER_USE;
1595 if (p->state > ORDER_IMPORT)
1597 p->state = ORDER_IMPORT;
1600 case ST_IMPLICIT_NONE:
1601 if (p->state > ORDER_IMPLICIT_NONE)
1604 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1605 statement disqualifies a USE but not an IMPLICIT NONE.
1606 Duplicate IMPLICIT NONEs are caught when the implicit types
1609 p->state = ORDER_IMPLICIT_NONE;
1613 if (p->state > ORDER_IMPLICIT)
1615 p->state = ORDER_IMPLICIT;
1620 if (p->state < ORDER_IMPLICIT_NONE)
1621 p->state = ORDER_IMPLICIT_NONE;
1625 if (p->state >= ORDER_EXEC)
1627 if (p->state < ORDER_IMPLICIT)
1628 p->state = ORDER_IMPLICIT;
1632 if (p->state < ORDER_SPEC)
1633 p->state = ORDER_SPEC;
1638 case ST_DERIVED_DECL:
1640 if (p->state >= ORDER_EXEC)
1642 if (p->state < ORDER_SPEC)
1643 p->state = ORDER_SPEC;
1648 if (p->state < ORDER_EXEC)
1649 p->state = ORDER_EXEC;
1653 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1654 gfc_ascii_statement (st));
1657 /* All is well, record the statement in case we need it next time. */
1658 p->where = gfc_current_locus;
1659 p->last_statement = st;
1664 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1665 gfc_ascii_statement (st),
1666 gfc_ascii_statement (p->last_statement), &p->where);
1672 /* Handle an unexpected end of file. This is a show-stopper... */
1674 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1677 unexpected_eof (void)
1681 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1683 /* Memory cleanup. Move to "second to last". */
1684 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1687 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1690 longjmp (eof_buf, 1);
1694 /* Set the default access attribute for a typebound procedure; this is used
1695 as callback for gfc_traverse_symtree. */
1697 static gfc_access typebound_default_access;
1700 set_typebound_default_access (gfc_symtree* stree)
1702 if (stree->typebound && stree->typebound->access == ACCESS_UNKNOWN)
1703 stree->typebound->access = typebound_default_access;
1707 /* Parse the CONTAINS section of a derived type definition. */
1710 parse_derived_contains (void)
1713 bool seen_private = false;
1714 bool seen_comps = false;
1715 bool error_flag = false;
1718 gcc_assert (gfc_current_state () == COMP_DERIVED);
1719 gcc_assert (gfc_current_block ());
1721 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1723 if (gfc_current_block ()->attr.sequence)
1724 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1725 " section at %C", gfc_current_block ()->name);
1726 if (gfc_current_block ()->attr.is_bind_c)
1727 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1728 " section at %C", gfc_current_block ()->name);
1730 accept_statement (ST_CONTAINS);
1731 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1737 st = next_statement ();
1745 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1750 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1751 " procedure at %C") == FAILURE)
1754 accept_statement (ST_PROCEDURE);
1759 if (gfc_notify_std (GFC_STD_F2003,
1760 "Fortran 2003: FINAL procedure declaration"
1761 " at %C") == FAILURE)
1764 accept_statement (ST_FINAL);
1772 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1773 "definition at %C with empty CONTAINS "
1774 "section") == FAILURE))
1777 /* ST_END_TYPE is accepted by parse_derived after return. */
1781 if (gfc_find_state (COMP_MODULE) == FAILURE)
1783 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1791 gfc_error ("PRIVATE statement at %C must precede procedure"
1799 gfc_error ("Duplicate PRIVATE statement at %C");
1803 accept_statement (ST_PRIVATE);
1804 seen_private = true;
1808 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1813 gfc_error ("Already inside a CONTAINS block at %C");
1818 unexpected_statement (st);
1824 gcc_assert (gfc_current_state () == COMP_DERIVED);
1826 /* Walk the parsed type-bound procedures and set ACCESS_UNKNOWN attributes
1827 to PUBLIC or PRIVATE depending on seen_private. */
1828 typebound_default_access = (seen_private ? ACCESS_PRIVATE : ACCESS_PUBLIC);
1829 gfc_traverse_symtree (gfc_current_block ()->f2k_derived->sym_root,
1830 &set_typebound_default_access);
1836 /* Parse a derived type. */
1839 parse_derived (void)
1841 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1844 gfc_symbol *derived_sym = NULL;
1850 accept_statement (ST_DERIVED_DECL);
1851 push_state (&s, COMP_DERIVED, gfc_new_block);
1853 gfc_new_block->component_access = ACCESS_PUBLIC;
1860 while (compiling_type)
1862 st = next_statement ();
1869 accept_statement (st);
1874 gfc_error ("PROCEDURE binding at %C must be inside CONTAINS");
1879 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1888 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1889 "definition at %C without components")
1893 accept_statement (ST_END_TYPE);
1897 if (gfc_find_state (COMP_MODULE) == FAILURE)
1899 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1907 gfc_error ("PRIVATE statement at %C must precede "
1908 "structure components");
1915 gfc_error ("Duplicate PRIVATE statement at %C");
1919 s.sym->component_access = ACCESS_PRIVATE;
1921 accept_statement (ST_PRIVATE);
1928 gfc_error ("SEQUENCE statement at %C must precede "
1929 "structure components");
1934 if (gfc_current_block ()->attr.sequence)
1935 gfc_warning ("SEQUENCE attribute at %C already specified in "
1940 gfc_error ("Duplicate SEQUENCE statement at %C");
1945 gfc_add_sequence (&gfc_current_block ()->attr,
1946 gfc_current_block ()->name, NULL);
1950 if (gfc_notify_std (GFC_STD_F2003,
1951 "Fortran 2003: CONTAINS block in derived type"
1952 " definition at %C") == FAILURE)
1955 accept_statement (ST_CONTAINS);
1956 if (parse_derived_contains ())
1961 unexpected_statement (st);
1966 /* need to verify that all fields of the derived type are
1967 * interoperable with C if the type is declared to be bind(c)
1969 derived_sym = gfc_current_block();
1971 sym = gfc_current_block ();
1972 for (c = sym->components; c; c = c->next)
1974 /* Look for allocatable components. */
1975 if (c->attr.allocatable
1976 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1978 sym->attr.alloc_comp = 1;
1982 /* Look for pointer components. */
1984 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1986 sym->attr.pointer_comp = 1;
1990 /* Look for private components. */
1991 if (sym->component_access == ACCESS_PRIVATE
1992 || c->attr.access == ACCESS_PRIVATE
1993 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
1995 sym->attr.private_comp = 1;
2000 if (!seen_component)
2001 sym->attr.zero_comp = 1;
2007 /* Parse an ENUM. */
2016 int seen_enumerator = 0;
2020 push_state (&s, COMP_ENUM, gfc_new_block);
2024 while (compiling_enum)
2026 st = next_statement ();
2034 seen_enumerator = 1;
2035 accept_statement (st);
2040 if (!seen_enumerator)
2042 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2045 accept_statement (st);
2049 gfc_free_enum_history ();
2050 unexpected_statement (st);
2058 /* Parse an interface. We must be able to deal with the possibility
2059 of recursive interfaces. The parse_spec() subroutine is mutually
2060 recursive with parse_interface(). */
2062 static gfc_statement parse_spec (gfc_statement);
2065 parse_interface (void)
2067 gfc_compile_state new_state = COMP_NONE, current_state;
2068 gfc_symbol *prog_unit, *sym;
2069 gfc_interface_info save;
2070 gfc_state_data s1, s2;
2074 accept_statement (ST_INTERFACE);
2076 current_interface.ns = gfc_current_ns;
2077 save = current_interface;
2079 sym = (current_interface.type == INTERFACE_GENERIC
2080 || current_interface.type == INTERFACE_USER_OP)
2081 ? gfc_new_block : NULL;
2083 push_state (&s1, COMP_INTERFACE, sym);
2084 current_state = COMP_NONE;
2087 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2089 st = next_statement ();
2097 if (st == ST_SUBROUTINE)
2098 new_state = COMP_SUBROUTINE;
2099 else if (st == ST_FUNCTION)
2100 new_state = COMP_FUNCTION;
2101 if (gfc_new_block->attr.pointer)
2103 gfc_new_block->attr.pointer = 0;
2104 gfc_new_block->attr.proc_pointer = 1;
2106 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2107 gfc_new_block->formal, NULL) == FAILURE)
2109 reject_statement ();
2110 gfc_free_namespace (gfc_current_ns);
2113 if (current_interface.type != INTERFACE_ABSTRACT &&
2114 !gfc_new_block->attr.dummy &&
2115 gfc_add_external (&gfc_new_block->attr, &gfc_current_locus) == FAILURE)
2117 reject_statement ();
2118 gfc_free_namespace (gfc_current_ns);
2124 case ST_MODULE_PROC: /* The module procedure matcher makes
2125 sure the context is correct. */
2126 accept_statement (st);
2127 gfc_free_namespace (gfc_current_ns);
2130 case ST_END_INTERFACE:
2131 gfc_free_namespace (gfc_current_ns);
2132 gfc_current_ns = current_interface.ns;
2136 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2137 gfc_ascii_statement (st));
2138 reject_statement ();
2139 gfc_free_namespace (gfc_current_ns);
2144 /* Make sure that a generic interface has only subroutines or
2145 functions and that the generic name has the right attribute. */
2146 if (current_interface.type == INTERFACE_GENERIC)
2148 if (current_state == COMP_NONE)
2150 if (new_state == COMP_FUNCTION)
2151 gfc_add_function (&sym->attr, sym->name, NULL);
2152 else if (new_state == COMP_SUBROUTINE)
2153 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2155 current_state = new_state;
2159 if (new_state != current_state)
2161 if (new_state == COMP_SUBROUTINE)
2162 gfc_error ("SUBROUTINE at %C does not belong in a "
2163 "generic function interface");
2165 if (new_state == COMP_FUNCTION)
2166 gfc_error ("FUNCTION at %C does not belong in a "
2167 "generic subroutine interface");
2172 if (current_interface.type == INTERFACE_ABSTRACT)
2174 gfc_new_block->attr.abstract = 1;
2175 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2176 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2177 "cannot be the same as an intrinsic type",
2178 gfc_new_block->name);
2181 push_state (&s2, new_state, gfc_new_block);
2182 accept_statement (st);
2183 prog_unit = gfc_new_block;
2184 prog_unit->formal_ns = gfc_current_ns;
2185 proc_locus = gfc_current_locus;
2188 /* Read data declaration statements. */
2189 st = parse_spec (ST_NONE);
2191 /* Since the interface block does not permit an IMPLICIT statement,
2192 the default type for the function or the result must be taken
2193 from the formal namespace. */
2194 if (new_state == COMP_FUNCTION)
2196 if (prog_unit->result == prog_unit
2197 && prog_unit->ts.type == BT_UNKNOWN)
2198 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2199 else if (prog_unit->result != prog_unit
2200 && prog_unit->result->ts.type == BT_UNKNOWN)
2201 gfc_set_default_type (prog_unit->result, 1,
2202 prog_unit->formal_ns);
2205 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2207 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2208 gfc_ascii_statement (st));
2209 reject_statement ();
2213 current_interface = save;
2214 gfc_add_interface (prog_unit);
2217 if (current_interface.ns
2218 && current_interface.ns->proc_name
2219 && strcmp (current_interface.ns->proc_name->name,
2220 prog_unit->name) == 0)
2221 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2222 "enclosing procedure", prog_unit->name, &proc_locus);
2231 /* Associate function characteristics by going back to the function
2232 declaration and rematching the prefix. */
2235 match_deferred_characteristics (gfc_typespec * ts)
2238 match m = MATCH_ERROR;
2239 char name[GFC_MAX_SYMBOL_LEN + 1];
2241 loc = gfc_current_locus;
2243 gfc_current_locus = gfc_current_block ()->declared_at;
2246 gfc_buffer_error (1);
2247 m = gfc_match_prefix (ts);
2248 gfc_buffer_error (0);
2250 if (ts->type == BT_DERIVED)
2254 if (!ts->derived || !ts->derived->components)
2258 /* Only permit one go at the characteristic association. */
2262 /* Set the function locus correctly. If we have not found the
2263 function name, there is an error. */
2264 gfc_match ("function% %n", name);
2265 if (m == MATCH_YES && strcmp (name, gfc_current_block ()->name) == 0)
2267 gfc_current_block ()->declared_at = gfc_current_locus;
2268 gfc_commit_symbols ();
2273 gfc_current_locus =loc;
2278 /* Check specification-expressions in the function result of the currently
2279 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2280 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2281 scope are not yet parsed so this has to be delayed up to parse_spec. */
2284 check_function_result_typed (void)
2286 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2288 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2289 gcc_assert (ts->type != BT_UNKNOWN);
2291 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2292 /* TODO: Extend when KIND type parameters are implemented. */
2293 if (ts->type == BT_CHARACTER && ts->cl && ts->cl->length)
2294 gfc_expr_check_typed (ts->cl->length, gfc_current_ns, true);
2298 /* Parse a set of specification statements. Returns the statement
2299 that doesn't fit. */
2301 static gfc_statement
2302 parse_spec (gfc_statement st)
2305 bool function_result_typed = false;
2306 bool bad_characteristic = false;
2309 verify_st_order (&ss, ST_NONE, false);
2311 st = next_statement ();
2313 /* If we are not inside a function or don't have a result specified so far,
2314 do nothing special about it. */
2315 if (gfc_current_state () != COMP_FUNCTION)
2316 function_result_typed = true;
2319 gfc_symbol* proc = gfc_current_ns->proc_name;
2322 if (proc->result->ts.type == BT_UNKNOWN)
2323 function_result_typed = true;
2328 /* If we find a statement that can not be followed by an IMPLICIT statement
2329 (and thus we can expect to see none any further), type the function result
2330 if it has not yet been typed. Be careful not to give the END statement
2331 to verify_st_order! */
2332 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2334 bool verify_now = false;
2336 if (st == ST_END_FUNCTION)
2341 verify_st_order (&dummyss, ST_NONE, false);
2342 verify_st_order (&dummyss, st, false);
2344 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2350 check_function_result_typed ();
2351 function_result_typed = true;
2360 case ST_IMPLICIT_NONE:
2362 if (!function_result_typed)
2364 check_function_result_typed ();
2365 function_result_typed = true;
2371 case ST_DATA: /* Not allowed in interfaces */
2372 if (gfc_current_state () == COMP_INTERFACE)
2382 case ST_DERIVED_DECL:
2385 if (verify_st_order (&ss, st, false) == FAILURE)
2387 reject_statement ();
2388 st = next_statement ();
2398 case ST_DERIVED_DECL:
2404 if (gfc_current_state () != COMP_MODULE)
2406 gfc_error ("%s statement must appear in a MODULE",
2407 gfc_ascii_statement (st));
2411 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2413 gfc_error ("%s statement at %C follows another accessibility "
2414 "specification", gfc_ascii_statement (st));
2418 gfc_current_ns->default_access = (st == ST_PUBLIC)
2419 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2423 case ST_STATEMENT_FUNCTION:
2424 if (gfc_current_state () == COMP_MODULE)
2426 unexpected_statement (st);
2434 accept_statement (st);
2435 st = next_statement ();
2439 accept_statement (st);
2441 st = next_statement ();
2444 case ST_GET_FCN_CHARACTERISTICS:
2445 /* This statement triggers the association of a function's result
2447 ts = &gfc_current_block ()->result->ts;
2448 if (match_deferred_characteristics (ts) != MATCH_YES)
2449 bad_characteristic = true;
2451 st = next_statement ();
2458 /* If match_deferred_characteristics failed, then there is an error. */
2459 if (bad_characteristic)
2461 ts = &gfc_current_block ()->result->ts;
2462 if (ts->type != BT_DERIVED)
2463 gfc_error ("Bad kind expression for function '%s' at %L",
2464 gfc_current_block ()->name,
2465 &gfc_current_block ()->declared_at);
2467 gfc_error ("The type for function '%s' at %L is not accessible",
2468 gfc_current_block ()->name,
2469 &gfc_current_block ()->declared_at);
2471 gfc_current_block ()->ts.kind = 0;
2472 /* Keep the derived type; if it's bad, it will be discovered later. */
2473 if (!(ts->type == BT_DERIVED && ts->derived))
2474 ts->type = BT_UNKNOWN;
2481 /* Parse a WHERE block, (not a simple WHERE statement). */
2484 parse_where_block (void)
2486 int seen_empty_else;
2491 accept_statement (ST_WHERE_BLOCK);
2492 top = gfc_state_stack->tail;
2494 push_state (&s, COMP_WHERE, gfc_new_block);
2496 d = add_statement ();
2497 d->expr = top->expr;
2503 seen_empty_else = 0;
2507 st = next_statement ();
2513 case ST_WHERE_BLOCK:
2514 parse_where_block ();
2519 accept_statement (st);
2523 if (seen_empty_else)
2525 gfc_error ("ELSEWHERE statement at %C follows previous "
2526 "unmasked ELSEWHERE");
2530 if (new_st.expr == NULL)
2531 seen_empty_else = 1;
2533 d = new_level (gfc_state_stack->head);
2535 d->expr = new_st.expr;
2537 accept_statement (st);
2542 accept_statement (st);
2546 gfc_error ("Unexpected %s statement in WHERE block at %C",
2547 gfc_ascii_statement (st));
2548 reject_statement ();
2552 while (st != ST_END_WHERE);
2558 /* Parse a FORALL block (not a simple FORALL statement). */
2561 parse_forall_block (void)
2567 accept_statement (ST_FORALL_BLOCK);
2568 top = gfc_state_stack->tail;
2570 push_state (&s, COMP_FORALL, gfc_new_block);
2572 d = add_statement ();
2573 d->op = EXEC_FORALL;
2578 st = next_statement ();
2583 case ST_POINTER_ASSIGNMENT:
2586 accept_statement (st);
2589 case ST_WHERE_BLOCK:
2590 parse_where_block ();
2593 case ST_FORALL_BLOCK:
2594 parse_forall_block ();
2598 accept_statement (st);
2605 gfc_error ("Unexpected %s statement in FORALL block at %C",
2606 gfc_ascii_statement (st));
2608 reject_statement ();
2612 while (st != ST_END_FORALL);
2618 static gfc_statement parse_executable (gfc_statement);
2620 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2623 parse_if_block (void)
2632 accept_statement (ST_IF_BLOCK);
2634 top = gfc_state_stack->tail;
2635 push_state (&s, COMP_IF, gfc_new_block);
2637 new_st.op = EXEC_IF;
2638 d = add_statement ();
2640 d->expr = top->expr;
2646 st = parse_executable (ST_NONE);
2656 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2657 "statement at %L", &else_locus);
2659 reject_statement ();
2663 d = new_level (gfc_state_stack->head);
2665 d->expr = new_st.expr;
2667 accept_statement (st);
2674 gfc_error ("Duplicate ELSE statements at %L and %C",
2676 reject_statement ();
2681 else_locus = gfc_current_locus;
2683 d = new_level (gfc_state_stack->head);
2686 accept_statement (st);
2694 unexpected_statement (st);
2698 while (st != ST_ENDIF);
2701 accept_statement (st);
2705 /* Parse a SELECT block. */
2708 parse_select_block (void)
2714 accept_statement (ST_SELECT_CASE);
2716 cp = gfc_state_stack->tail;
2717 push_state (&s, COMP_SELECT, gfc_new_block);
2719 /* Make sure that the next statement is a CASE or END SELECT. */
2722 st = next_statement ();
2725 if (st == ST_END_SELECT)
2727 /* Empty SELECT CASE is OK. */
2728 accept_statement (st);
2735 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2738 reject_statement ();
2741 /* At this point, we're got a nonempty select block. */
2742 cp = new_level (cp);
2745 accept_statement (st);
2749 st = parse_executable (ST_NONE);
2756 cp = new_level (gfc_state_stack->head);
2758 gfc_clear_new_st ();
2760 accept_statement (st);
2766 /* Can't have an executable statement because of
2767 parse_executable(). */
2769 unexpected_statement (st);
2773 while (st != ST_END_SELECT);
2776 accept_statement (st);
2780 /* Given a symbol, make sure it is not an iteration variable for a DO
2781 statement. This subroutine is called when the symbol is seen in a
2782 context that causes it to become redefined. If the symbol is an
2783 iterator, we generate an error message and return nonzero. */
2786 gfc_check_do_variable (gfc_symtree *st)
2790 for (s=gfc_state_stack; s; s = s->previous)
2791 if (s->do_variable == st)
2793 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2794 "loop beginning at %L", st->name, &s->head->loc);
2802 /* Checks to see if the current statement label closes an enddo.
2803 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2804 an error) if it incorrectly closes an ENDDO. */
2807 check_do_closure (void)
2811 if (gfc_statement_label == NULL)
2814 for (p = gfc_state_stack; p; p = p->previous)
2815 if (p->state == COMP_DO)
2819 return 0; /* No loops to close */
2821 if (p->ext.end_do_label == gfc_statement_label)
2824 if (p == gfc_state_stack)
2827 gfc_error ("End of nonblock DO statement at %C is within another block");
2831 /* At this point, the label doesn't terminate the innermost loop.
2832 Make sure it doesn't terminate another one. */
2833 for (; p; p = p->previous)
2834 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2836 gfc_error ("End of nonblock DO statement at %C is interwoven "
2837 "with another DO loop");
2845 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2846 handled inside of parse_executable(), because they aren't really
2850 parse_do_block (void)
2857 s.ext.end_do_label = new_st.label;
2859 if (new_st.ext.iterator != NULL)
2860 stree = new_st.ext.iterator->var->symtree;
2864 accept_statement (ST_DO);
2866 top = gfc_state_stack->tail;
2867 push_state (&s, COMP_DO, gfc_new_block);
2869 s.do_variable = stree;
2871 top->block = new_level (top);
2872 top->block->op = EXEC_DO;
2875 st = parse_executable (ST_NONE);
2883 if (s.ext.end_do_label != NULL
2884 && s.ext.end_do_label != gfc_statement_label)
2885 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2888 if (gfc_statement_label != NULL)
2890 new_st.op = EXEC_NOP;
2895 case ST_IMPLIED_ENDDO:
2896 /* If the do-stmt of this DO construct has a do-construct-name,
2897 the corresponding end-do must be an end-do-stmt (with a matching
2898 name, but in that case we must have seen ST_ENDDO first).
2899 We only complain about this in pedantic mode. */
2900 if (gfc_current_block () != NULL)
2901 gfc_error_now ("named block DO at %L requires matching ENDDO name",
2902 &gfc_current_block()->declared_at);
2907 unexpected_statement (st);
2912 accept_statement (st);
2916 /* Parse the statements of OpenMP do/parallel do. */
2918 static gfc_statement
2919 parse_omp_do (gfc_statement omp_st)
2925 accept_statement (omp_st);
2927 cp = gfc_state_stack->tail;
2928 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2929 np = new_level (cp);
2935 st = next_statement ();
2938 else if (st == ST_DO)
2941 unexpected_statement (st);
2945 if (gfc_statement_label != NULL
2946 && gfc_state_stack->previous != NULL
2947 && gfc_state_stack->previous->state == COMP_DO
2948 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2956 there should be no !$OMP END DO. */
2958 return ST_IMPLIED_ENDDO;
2961 check_do_closure ();
2964 st = next_statement ();
2965 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2967 if (new_st.op == EXEC_OMP_END_NOWAIT)
2968 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2970 gcc_assert (new_st.op == EXEC_NOP);
2971 gfc_clear_new_st ();
2972 gfc_commit_symbols ();
2973 gfc_warning_check ();
2974 st = next_statement ();
2980 /* Parse the statements of OpenMP atomic directive. */
2983 parse_omp_atomic (void)
2989 accept_statement (ST_OMP_ATOMIC);
2991 cp = gfc_state_stack->tail;
2992 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2993 np = new_level (cp);
2999 st = next_statement ();
3002 else if (st == ST_ASSIGNMENT)
3005 unexpected_statement (st);
3008 accept_statement (st);
3014 /* Parse the statements of an OpenMP structured block. */
3017 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3019 gfc_statement st, omp_end_st;
3023 accept_statement (omp_st);
3025 cp = gfc_state_stack->tail;
3026 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3027 np = new_level (cp);
3033 case ST_OMP_PARALLEL:
3034 omp_end_st = ST_OMP_END_PARALLEL;
3036 case ST_OMP_PARALLEL_SECTIONS:
3037 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3039 case ST_OMP_SECTIONS:
3040 omp_end_st = ST_OMP_END_SECTIONS;
3042 case ST_OMP_ORDERED:
3043 omp_end_st = ST_OMP_END_ORDERED;
3045 case ST_OMP_CRITICAL:
3046 omp_end_st = ST_OMP_END_CRITICAL;
3049 omp_end_st = ST_OMP_END_MASTER;
3052 omp_end_st = ST_OMP_END_SINGLE;
3055 omp_end_st = ST_OMP_END_TASK;
3057 case ST_OMP_WORKSHARE:
3058 omp_end_st = ST_OMP_END_WORKSHARE;
3060 case ST_OMP_PARALLEL_WORKSHARE:
3061 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3069 if (workshare_stmts_only)
3071 /* Inside of !$omp workshare, only
3074 where statements and constructs
3075 forall statements and constructs
3079 are allowed. For !$omp critical these
3080 restrictions apply recursively. */
3083 st = next_statement ();
3094 accept_statement (st);
3097 case ST_WHERE_BLOCK:
3098 parse_where_block ();
3101 case ST_FORALL_BLOCK:
3102 parse_forall_block ();
3105 case ST_OMP_PARALLEL:
3106 case ST_OMP_PARALLEL_SECTIONS:
3107 parse_omp_structured_block (st, false);
3110 case ST_OMP_PARALLEL_WORKSHARE:
3111 case ST_OMP_CRITICAL:
3112 parse_omp_structured_block (st, true);
3115 case ST_OMP_PARALLEL_DO:
3116 st = parse_omp_do (st);
3120 parse_omp_atomic ();
3131 st = next_statement ();
3135 st = parse_executable (ST_NONE);
3138 else if (st == ST_OMP_SECTION
3139 && (omp_st == ST_OMP_SECTIONS
3140 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3142 np = new_level (np);
3146 else if (st != omp_end_st)
3147 unexpected_statement (st);
3149 while (st != omp_end_st);
3153 case EXEC_OMP_END_NOWAIT:
3154 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3156 case EXEC_OMP_CRITICAL:
3157 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3158 || (new_st.ext.omp_name != NULL
3159 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3160 gfc_error ("Name after !$omp critical and !$omp end critical does "
3162 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3164 case EXEC_OMP_END_SINGLE:
3165 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3166 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3167 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3168 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3176 gfc_clear_new_st ();
3177 gfc_commit_symbols ();
3178 gfc_warning_check ();
3183 /* Accept a series of executable statements. We return the first
3184 statement that doesn't fit to the caller. Any block statements are
3185 passed on to the correct handler, which usually passes the buck
3188 static gfc_statement
3189 parse_executable (gfc_statement st)
3194 st = next_statement ();
3198 close_flag = check_do_closure ();
3203 case ST_END_PROGRAM:
3206 case ST_END_FUNCTION:
3210 case ST_END_SUBROUTINE:
3215 case ST_SELECT_CASE:
3216 gfc_error ("%s statement at %C cannot terminate a non-block "
3217 "DO loop", gfc_ascii_statement (st));
3233 accept_statement (st);
3234 if (close_flag == 1)
3235 return ST_IMPLIED_ENDDO;
3242 case ST_SELECT_CASE:
3243 parse_select_block ();
3248 if (check_do_closure () == 1)
3249 return ST_IMPLIED_ENDDO;
3252 case ST_WHERE_BLOCK:
3253 parse_where_block ();
3256 case ST_FORALL_BLOCK:
3257 parse_forall_block ();
3260 case ST_OMP_PARALLEL:
3261 case ST_OMP_PARALLEL_SECTIONS:
3262 case ST_OMP_SECTIONS:
3263 case ST_OMP_ORDERED:
3264 case ST_OMP_CRITICAL:
3268 parse_omp_structured_block (st, false);
3271 case ST_OMP_WORKSHARE:
3272 case ST_OMP_PARALLEL_WORKSHARE:
3273 parse_omp_structured_block (st, true);
3277 case ST_OMP_PARALLEL_DO:
3278 st = parse_omp_do (st);
3279 if (st == ST_IMPLIED_ENDDO)
3284 parse_omp_atomic ();
3291 st = next_statement ();
3296 /* Parse a series of contained program units. */
3298 static void parse_progunit (gfc_statement);
3301 /* Fix the symbols for sibling functions. These are incorrectly added to
3302 the child namespace as the parser didn't know about this procedure. */
3305 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3309 gfc_symbol *old_sym;
3311 sym->attr.referenced = 1;
3312 for (ns = siblings; ns; ns = ns->sibling)
3314 gfc_find_sym_tree (sym->name, ns, 0, &st);
3316 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3319 old_sym = st->n.sym;
3320 if (old_sym->ns == ns
3321 && !old_sym->attr.contained
3323 /* By 14.6.1.3, host association should be excluded
3324 for the following. */
3325 && !(old_sym->attr.external
3326 || (old_sym->ts.type != BT_UNKNOWN
3327 && !old_sym->attr.implicit_type)
3328 || old_sym->attr.flavor == FL_PARAMETER
3329 || old_sym->attr.in_common
3330 || old_sym->attr.in_equivalence
3331 || old_sym->attr.data
3332 || old_sym->attr.dummy
3333 || old_sym->attr.result
3334 || old_sym->attr.dimension
3335 || old_sym->attr.allocatable
3336 || old_sym->attr.intrinsic
3337 || old_sym->attr.generic
3338 || old_sym->attr.flavor == FL_NAMELIST
3339 || old_sym->attr.proc == PROC_ST_FUNCTION))
3341 /* Replace it with the symbol from the parent namespace. */
3345 /* Free the old (local) symbol. */
3347 if (old_sym->refs == 0)
3348 gfc_free_symbol (old_sym);
3351 /* Do the same for any contained procedures. */
3352 gfc_fixup_sibling_symbols (sym, ns->contained);
3357 parse_contained (int module)
3359 gfc_namespace *ns, *parent_ns, *tmp;
3360 gfc_state_data s1, s2;
3364 int contains_statements = 0;
3367 push_state (&s1, COMP_CONTAINS, NULL);
3368 parent_ns = gfc_current_ns;
3372 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3374 gfc_current_ns->sibling = parent_ns->contained;
3375 parent_ns->contained = gfc_current_ns;
3378 /* Process the next available statement. We come here if we got an error
3379 and rejected the last statement. */
3380 st = next_statement ();
3389 contains_statements = 1;
3390 accept_statement (st);
3393 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3396 /* For internal procedures, create/update the symbol in the
3397 parent namespace. */
3401 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3402 gfc_error ("Contained procedure '%s' at %C is already "
3403 "ambiguous", gfc_new_block->name);
3406 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3407 &gfc_new_block->declared_at) ==
3410 if (st == ST_FUNCTION)
3411 gfc_add_function (&sym->attr, sym->name,
3412 &gfc_new_block->declared_at);
3414 gfc_add_subroutine (&sym->attr, sym->name,
3415 &gfc_new_block->declared_at);
3419 gfc_commit_symbols ();
3422 sym = gfc_new_block;
3424 /* Mark this as a contained function, so it isn't replaced
3425 by other module functions. */
3426 sym->attr.contained = 1;
3427 sym->attr.referenced = 1;
3429 parse_progunit (ST_NONE);
3431 /* Fix up any sibling functions that refer to this one. */
3432 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3433 /* Or refer to any of its alternate entry points. */
3434 for (el = gfc_current_ns->entries; el; el = el->next)
3435 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3437 gfc_current_ns->code = s2.head;
3438 gfc_current_ns = parent_ns;
3443 /* These statements are associated with the end of the host unit. */
3444 case ST_END_FUNCTION:
3446 case ST_END_PROGRAM:
3447 case ST_END_SUBROUTINE:
3448 accept_statement (st);
3452 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3453 gfc_ascii_statement (st));
3454 reject_statement ();
3460 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3461 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3463 /* The first namespace in the list is guaranteed to not have
3464 anything (worthwhile) in it. */
3465 tmp = gfc_current_ns;
3466 gfc_current_ns = parent_ns;
3467 if (seen_error && tmp->refs > 1)
3468 gfc_free_namespace (tmp);
3470 ns = gfc_current_ns->contained;
3471 gfc_current_ns->contained = ns->sibling;
3472 gfc_free_namespace (ns);
3475 if (!contains_statements)
3476 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3477 "FUNCTION or SUBROUTINE statement at %C");
3481 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3484 parse_progunit (gfc_statement st)
3489 st = parse_spec (st);
3499 accept_statement (st);
3506 if (gfc_current_state () == COMP_FUNCTION)
3507 gfc_check_function_type (gfc_current_ns);
3512 st = parse_executable (st);
3523 accept_statement (st);
3530 unexpected_statement (st);
3531 reject_statement ();
3532 st = next_statement ();
3538 for (p = gfc_state_stack; p; p = p->previous)
3539 if (p->state == COMP_CONTAINS)
3542 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3547 gfc_error ("CONTAINS statement at %C is already in a contained "
3549 st = next_statement ();
3553 parse_contained (0);
3556 gfc_current_ns->code = gfc_state_stack->head;
3560 /* Come here to complain about a global symbol already in use as
3564 gfc_global_used (gfc_gsymbol *sym, locus *where)
3569 where = &gfc_current_locus;
3579 case GSYM_SUBROUTINE:
3580 name = "SUBROUTINE";
3585 case GSYM_BLOCK_DATA:
3586 name = "BLOCK DATA";
3592 gfc_internal_error ("gfc_global_used(): Bad type");
3596 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3597 sym->name, where, name, &sym->where);
3601 /* Parse a block data program unit. */
3604 parse_block_data (void)
3607 static locus blank_locus;
3608 static int blank_block=0;
3611 gfc_current_ns->proc_name = gfc_new_block;
3612 gfc_current_ns->is_block_data = 1;
3614 if (gfc_new_block == NULL)
3617 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3618 "prior BLOCK DATA at %L", &blank_locus);
3622 blank_locus = gfc_current_locus;
3627 s = gfc_get_gsymbol (gfc_new_block->name);
3629 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3630 gfc_global_used(s, NULL);
3633 s->type = GSYM_BLOCK_DATA;
3634 s->where = gfc_current_locus;
3639 st = parse_spec (ST_NONE);
3641 while (st != ST_END_BLOCK_DATA)
3643 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3644 gfc_ascii_statement (st));
3645 reject_statement ();
3646 st = next_statement ();
3651 /* Parse a module subprogram. */
3659 s = gfc_get_gsymbol (gfc_new_block->name);
3660 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3661 gfc_global_used(s, NULL);
3664 s->type = GSYM_MODULE;
3665 s->where = gfc_current_locus;
3669 st = parse_spec (ST_NONE);
3678 parse_contained (1);
3682 accept_statement (st);
3686 gfc_error ("Unexpected %s statement in MODULE at %C",
3687 gfc_ascii_statement (st));
3689 reject_statement ();
3690 st = next_statement ();
3696 /* Add a procedure name to the global symbol table. */
3699 add_global_procedure (int sub)
3703 s = gfc_get_gsymbol(gfc_new_block->name);
3706 || (s->type != GSYM_UNKNOWN
3707 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3708 gfc_global_used(s, NULL);
3711 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3712 s->where = gfc_current_locus;
3718 /* Add a program to the global symbol table. */
3721 add_global_program (void)
3725 if (gfc_new_block == NULL)
3727 s = gfc_get_gsymbol (gfc_new_block->name);
3729 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3730 gfc_global_used(s, NULL);
3733 s->type = GSYM_PROGRAM;
3734 s->where = gfc_current_locus;
3740 /* Top level parser. */
3743 gfc_parse_file (void)
3745 int seen_program, errors_before, errors;
3746 gfc_state_data top, s;
3750 gfc_start_source_files ();
3752 top.state = COMP_NONE;
3754 top.previous = NULL;
3755 top.head = top.tail = NULL;
3756 top.do_variable = NULL;
3758 gfc_state_stack = ⊤
3760 gfc_clear_new_st ();
3762 gfc_statement_label = NULL;
3764 if (setjmp (eof_buf))
3765 return FAILURE; /* Come here on unexpected EOF */
3769 /* Exit early for empty files. */
3775 st = next_statement ();
3784 goto duplicate_main;
3786 prog_locus = gfc_current_locus;
3788 push_state (&s, COMP_PROGRAM, gfc_new_block);
3789 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3790 accept_statement (st);
3791 add_global_program ();
3792 parse_progunit (ST_NONE);
3796 add_global_procedure (1);
3797 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3798 accept_statement (st);
3799 parse_progunit (ST_NONE);
3803 add_global_procedure (0);
3804 push_state (&s, COMP_FUNCTION, gfc_new_block);
3805 accept_statement (st);
3806 parse_progunit (ST_NONE);
3810 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3811 accept_statement (st);
3812 parse_block_data ();
3816 push_state (&s, COMP_MODULE, gfc_new_block);
3817 accept_statement (st);
3819 gfc_get_errors (NULL, &errors_before);
3823 /* Anything else starts a nameless main program block. */
3826 goto duplicate_main;
3828 prog_locus = gfc_current_locus;
3830 push_state (&s, COMP_PROGRAM, gfc_new_block);
3831 main_program_symbol (gfc_current_ns, "MAIN__");
3832 parse_progunit (st);
3836 gfc_current_ns->code = s.head;
3838 gfc_resolve (gfc_current_ns);
3840 /* Dump the parse tree if requested. */
3841 if (gfc_option.dump_parse_tree)
3842 gfc_dump_parse_tree (gfc_current_ns, stdout);
3844 gfc_get_errors (NULL, &errors);
3845 if (s.state == COMP_MODULE)
3847 gfc_dump_module (s.sym->name, errors_before == errors);
3849 gfc_generate_module_code (gfc_current_ns);
3854 gfc_generate_code (gfc_current_ns);
3862 gfc_end_source_files ();
3866 /* If we see a duplicate main program, shut down. If the second
3867 instance is an implied main program, i.e. data decls or executable
3868 statements, we're in for lots of errors. */
3869 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3870 reject_statement ();