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)
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;
1663 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1664 gfc_ascii_statement (st),
1665 gfc_ascii_statement (p->last_statement), &p->where);
1671 /* Handle an unexpected end of file. This is a show-stopper... */
1673 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1676 unexpected_eof (void)
1680 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1682 /* Memory cleanup. Move to "second to last". */
1683 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1686 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1689 longjmp (eof_buf, 1);
1693 /* Parse a derived type. */
1696 parse_derived (void)
1698 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1699 int seen_contains, seen_contains_comp;
1702 gfc_symbol *derived_sym = NULL;
1708 accept_statement (ST_DERIVED_DECL);
1709 push_state (&s, COMP_DERIVED, gfc_new_block);
1711 gfc_new_block->component_access = ACCESS_PUBLIC;
1716 seen_contains_comp = 0;
1720 while (compiling_type)
1722 st = next_statement ();
1732 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1736 accept_statement (st);
1743 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1747 if (gfc_notify_std (GFC_STD_F2003,
1748 "Fortran 2003: FINAL procedure declaration"
1749 " at %C") == FAILURE)
1752 accept_statement (ST_FINAL);
1753 seen_contains_comp = 1;
1760 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1761 "definition at %C without components")
1765 if (seen_contains && !seen_contains_comp
1766 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1767 "definition at %C with empty CONTAINS "
1768 "section") == FAILURE))
1771 accept_statement (ST_END_TYPE);
1777 gfc_error ("PRIVATE statement at %C must precede CONTAINS");
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 "
1792 "structure components");
1799 gfc_error ("Duplicate PRIVATE statement at %C");
1803 s.sym->component_access = ACCESS_PRIVATE;
1804 accept_statement (ST_PRIVATE);
1811 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1817 gfc_error ("SEQUENCE statement at %C must precede "
1818 "structure components");
1823 if (gfc_current_block ()->attr.sequence)
1824 gfc_warning ("SEQUENCE attribute at %C already specified in "
1829 gfc_error ("Duplicate SEQUENCE statement at %C");
1834 gfc_add_sequence (&gfc_current_block ()->attr,
1835 gfc_current_block ()->name, NULL);
1839 if (gfc_notify_std (GFC_STD_F2003,
1840 "Fortran 2003: CONTAINS block in derived type"
1841 " definition at %C") == FAILURE)
1846 gfc_error ("Already inside a CONTAINS block at %C");
1851 accept_statement (ST_CONTAINS);
1855 unexpected_statement (st);
1860 /* need to verify that all fields of the derived type are
1861 * interoperable with C if the type is declared to be bind(c)
1863 derived_sym = gfc_current_block();
1865 sym = gfc_current_block ();
1866 for (c = sym->components; c; c = c->next)
1868 /* Look for allocatable components. */
1870 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1872 sym->attr.alloc_comp = 1;
1876 /* Look for pointer components. */
1878 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1880 sym->attr.pointer_comp = 1;
1884 /* Look for private components. */
1885 if (sym->component_access == ACCESS_PRIVATE
1886 || c->access == ACCESS_PRIVATE
1887 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
1889 sym->attr.private_comp = 1;
1894 if (!seen_component)
1895 sym->attr.zero_comp = 1;
1901 /* Parse an ENUM. */
1910 int seen_enumerator = 0;
1914 push_state (&s, COMP_ENUM, gfc_new_block);
1918 while (compiling_enum)
1920 st = next_statement ();
1928 seen_enumerator = 1;
1929 accept_statement (st);
1934 if (!seen_enumerator)
1936 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
1939 accept_statement (st);
1943 gfc_free_enum_history ();
1944 unexpected_statement (st);
1952 /* Parse an interface. We must be able to deal with the possibility
1953 of recursive interfaces. The parse_spec() subroutine is mutually
1954 recursive with parse_interface(). */
1956 static gfc_statement parse_spec (gfc_statement);
1959 parse_interface (void)
1961 gfc_compile_state new_state, current_state;
1962 gfc_symbol *prog_unit, *sym;
1963 gfc_interface_info save;
1964 gfc_state_data s1, s2;
1968 accept_statement (ST_INTERFACE);
1970 current_interface.ns = gfc_current_ns;
1971 save = current_interface;
1973 sym = (current_interface.type == INTERFACE_GENERIC
1974 || current_interface.type == INTERFACE_USER_OP)
1975 ? gfc_new_block : NULL;
1977 push_state (&s1, COMP_INTERFACE, sym);
1978 current_state = COMP_NONE;
1981 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
1983 st = next_statement ();
1991 if (st == ST_SUBROUTINE)
1992 new_state = COMP_SUBROUTINE;
1993 else if (st == ST_FUNCTION)
1994 new_state = COMP_FUNCTION;
1995 if (gfc_new_block->attr.pointer)
1997 gfc_new_block->attr.pointer = 0;
1998 gfc_new_block->attr.proc_pointer = 1;
2000 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2001 gfc_new_block->formal, NULL) == FAILURE)
2003 reject_statement ();
2004 gfc_free_namespace (gfc_current_ns);
2007 if (current_interface.type != INTERFACE_ABSTRACT &&
2008 !gfc_new_block->attr.dummy &&
2009 gfc_add_external (&gfc_new_block->attr, &gfc_current_locus) == FAILURE)
2011 reject_statement ();
2012 gfc_free_namespace (gfc_current_ns);
2018 case ST_MODULE_PROC: /* The module procedure matcher makes
2019 sure the context is correct. */
2020 accept_statement (st);
2021 gfc_free_namespace (gfc_current_ns);
2024 case ST_END_INTERFACE:
2025 gfc_free_namespace (gfc_current_ns);
2026 gfc_current_ns = current_interface.ns;
2030 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2031 gfc_ascii_statement (st));
2032 reject_statement ();
2033 gfc_free_namespace (gfc_current_ns);
2038 /* Make sure that a generic interface has only subroutines or
2039 functions and that the generic name has the right attribute. */
2040 if (current_interface.type == INTERFACE_GENERIC)
2042 if (current_state == COMP_NONE)
2044 if (new_state == COMP_FUNCTION)
2045 gfc_add_function (&sym->attr, sym->name, NULL);
2046 else if (new_state == COMP_SUBROUTINE)
2047 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2049 current_state = new_state;
2053 if (new_state != current_state)
2055 if (new_state == COMP_SUBROUTINE)
2056 gfc_error ("SUBROUTINE at %C does not belong in a "
2057 "generic function interface");
2059 if (new_state == COMP_FUNCTION)
2060 gfc_error ("FUNCTION at %C does not belong in a "
2061 "generic subroutine interface");
2066 if (current_interface.type == INTERFACE_ABSTRACT)
2068 gfc_new_block->attr.abstract = 1;
2069 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2070 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2071 "cannot be the same as an intrinsic type",
2072 gfc_new_block->name);
2075 push_state (&s2, new_state, gfc_new_block);
2076 accept_statement (st);
2077 prog_unit = gfc_new_block;
2078 prog_unit->formal_ns = gfc_current_ns;
2079 proc_locus = gfc_current_locus;
2082 /* Read data declaration statements. */
2083 st = parse_spec (ST_NONE);
2085 /* Since the interface block does not permit an IMPLICIT statement,
2086 the default type for the function or the result must be taken
2087 from the formal namespace. */
2088 if (new_state == COMP_FUNCTION)
2090 if (prog_unit->result == prog_unit
2091 && prog_unit->ts.type == BT_UNKNOWN)
2092 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2093 else if (prog_unit->result != prog_unit
2094 && prog_unit->result->ts.type == BT_UNKNOWN)
2095 gfc_set_default_type (prog_unit->result, 1,
2096 prog_unit->formal_ns);
2099 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2101 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2102 gfc_ascii_statement (st));
2103 reject_statement ();
2107 current_interface = save;
2108 gfc_add_interface (prog_unit);
2111 if (current_interface.ns
2112 && current_interface.ns->proc_name
2113 && strcmp (current_interface.ns->proc_name->name,
2114 prog_unit->name) == 0)
2115 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2116 "enclosing procedure", prog_unit->name, &proc_locus);
2125 /* Associate function characteristics by going back to the function
2126 declaration and rematching the prefix. */
2129 match_deferred_characteristics (gfc_typespec * ts)
2132 match m = MATCH_ERROR;
2133 char name[GFC_MAX_SYMBOL_LEN + 1];
2135 loc = gfc_current_locus;
2137 gfc_current_locus = gfc_current_block ()->declared_at;
2140 gfc_buffer_error (1);
2141 m = gfc_match_prefix (ts);
2142 gfc_buffer_error (0);
2144 if (ts->type == BT_DERIVED)
2148 if (!ts->derived || !ts->derived->components)
2152 /* Only permit one go at the characteristic association. */
2156 /* Set the function locus correctly. If we have not found the
2157 function name, there is an error. */
2158 gfc_match ("function% %n", name);
2159 if (m == MATCH_YES && strcmp (name, gfc_current_block ()->name) == 0)
2161 gfc_current_block ()->declared_at = gfc_current_locus;
2162 gfc_commit_symbols ();
2167 gfc_current_locus =loc;
2172 /* Parse a set of specification statements. Returns the statement
2173 that doesn't fit. */
2175 static gfc_statement
2176 parse_spec (gfc_statement st)
2179 bool bad_characteristic = false;
2182 verify_st_order (&ss, ST_NONE);
2184 st = next_statement ();
2194 case ST_DATA: /* Not allowed in interfaces */
2195 if (gfc_current_state () == COMP_INTERFACE)
2202 case ST_IMPLICIT_NONE:
2207 case ST_DERIVED_DECL:
2209 if (verify_st_order (&ss, st) == FAILURE)
2211 reject_statement ();
2212 st = next_statement ();
2222 case ST_DERIVED_DECL:
2228 if (gfc_current_state () != COMP_MODULE)
2230 gfc_error ("%s statement must appear in a MODULE",
2231 gfc_ascii_statement (st));
2235 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2237 gfc_error ("%s statement at %C follows another accessibility "
2238 "specification", gfc_ascii_statement (st));
2242 gfc_current_ns->default_access = (st == ST_PUBLIC)
2243 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2247 case ST_STATEMENT_FUNCTION:
2248 if (gfc_current_state () == COMP_MODULE)
2250 unexpected_statement (st);
2258 accept_statement (st);
2259 st = next_statement ();
2263 accept_statement (st);
2265 st = next_statement ();
2268 case ST_GET_FCN_CHARACTERISTICS:
2269 /* This statement triggers the association of a function's result
2271 ts = &gfc_current_block ()->result->ts;
2272 if (match_deferred_characteristics (ts) != MATCH_YES)
2273 bad_characteristic = true;
2275 st = next_statement ();
2282 /* If match_deferred_characteristics failed, then there is an error. */
2283 if (bad_characteristic)
2285 ts = &gfc_current_block ()->result->ts;
2286 if (ts->type != BT_DERIVED)
2287 gfc_error ("Bad kind expression for function '%s' at %L",
2288 gfc_current_block ()->name,
2289 &gfc_current_block ()->declared_at);
2291 gfc_error ("The type for function '%s' at %L is not accessible",
2292 gfc_current_block ()->name,
2293 &gfc_current_block ()->declared_at);
2295 gfc_current_block ()->ts.kind = 0;
2296 /* Keep the derived type; if it's bad, it will be discovered later. */
2297 if (!(ts->type == BT_DERIVED && ts->derived))
2298 ts->type = BT_UNKNOWN;
2305 /* Parse a WHERE block, (not a simple WHERE statement). */
2308 parse_where_block (void)
2310 int seen_empty_else;
2315 accept_statement (ST_WHERE_BLOCK);
2316 top = gfc_state_stack->tail;
2318 push_state (&s, COMP_WHERE, gfc_new_block);
2320 d = add_statement ();
2321 d->expr = top->expr;
2327 seen_empty_else = 0;
2331 st = next_statement ();
2337 case ST_WHERE_BLOCK:
2338 parse_where_block ();
2343 accept_statement (st);
2347 if (seen_empty_else)
2349 gfc_error ("ELSEWHERE statement at %C follows previous "
2350 "unmasked ELSEWHERE");
2354 if (new_st.expr == NULL)
2355 seen_empty_else = 1;
2357 d = new_level (gfc_state_stack->head);
2359 d->expr = new_st.expr;
2361 accept_statement (st);
2366 accept_statement (st);
2370 gfc_error ("Unexpected %s statement in WHERE block at %C",
2371 gfc_ascii_statement (st));
2372 reject_statement ();
2376 while (st != ST_END_WHERE);
2382 /* Parse a FORALL block (not a simple FORALL statement). */
2385 parse_forall_block (void)
2391 accept_statement (ST_FORALL_BLOCK);
2392 top = gfc_state_stack->tail;
2394 push_state (&s, COMP_FORALL, gfc_new_block);
2396 d = add_statement ();
2397 d->op = EXEC_FORALL;
2402 st = next_statement ();
2407 case ST_POINTER_ASSIGNMENT:
2410 accept_statement (st);
2413 case ST_WHERE_BLOCK:
2414 parse_where_block ();
2417 case ST_FORALL_BLOCK:
2418 parse_forall_block ();
2422 accept_statement (st);
2429 gfc_error ("Unexpected %s statement in FORALL block at %C",
2430 gfc_ascii_statement (st));
2432 reject_statement ();
2436 while (st != ST_END_FORALL);
2442 static gfc_statement parse_executable (gfc_statement);
2444 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2447 parse_if_block (void)
2456 accept_statement (ST_IF_BLOCK);
2458 top = gfc_state_stack->tail;
2459 push_state (&s, COMP_IF, gfc_new_block);
2461 new_st.op = EXEC_IF;
2462 d = add_statement ();
2464 d->expr = top->expr;
2470 st = parse_executable (ST_NONE);
2480 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2481 "statement at %L", &else_locus);
2483 reject_statement ();
2487 d = new_level (gfc_state_stack->head);
2489 d->expr = new_st.expr;
2491 accept_statement (st);
2498 gfc_error ("Duplicate ELSE statements at %L and %C",
2500 reject_statement ();
2505 else_locus = gfc_current_locus;
2507 d = new_level (gfc_state_stack->head);
2510 accept_statement (st);
2518 unexpected_statement (st);
2522 while (st != ST_ENDIF);
2525 accept_statement (st);
2529 /* Parse a SELECT block. */
2532 parse_select_block (void)
2538 accept_statement (ST_SELECT_CASE);
2540 cp = gfc_state_stack->tail;
2541 push_state (&s, COMP_SELECT, gfc_new_block);
2543 /* Make sure that the next statement is a CASE or END SELECT. */
2546 st = next_statement ();
2549 if (st == ST_END_SELECT)
2551 /* Empty SELECT CASE is OK. */
2552 accept_statement (st);
2559 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2562 reject_statement ();
2565 /* At this point, we're got a nonempty select block. */
2566 cp = new_level (cp);
2569 accept_statement (st);
2573 st = parse_executable (ST_NONE);
2580 cp = new_level (gfc_state_stack->head);
2582 gfc_clear_new_st ();
2584 accept_statement (st);
2590 /* Can't have an executable statement because of
2591 parse_executable(). */
2593 unexpected_statement (st);
2597 while (st != ST_END_SELECT);
2600 accept_statement (st);
2604 /* Given a symbol, make sure it is not an iteration variable for a DO
2605 statement. This subroutine is called when the symbol is seen in a
2606 context that causes it to become redefined. If the symbol is an
2607 iterator, we generate an error message and return nonzero. */
2610 gfc_check_do_variable (gfc_symtree *st)
2614 for (s=gfc_state_stack; s; s = s->previous)
2615 if (s->do_variable == st)
2617 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2618 "loop beginning at %L", st->name, &s->head->loc);
2626 /* Checks to see if the current statement label closes an enddo.
2627 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2628 an error) if it incorrectly closes an ENDDO. */
2631 check_do_closure (void)
2635 if (gfc_statement_label == NULL)
2638 for (p = gfc_state_stack; p; p = p->previous)
2639 if (p->state == COMP_DO)
2643 return 0; /* No loops to close */
2645 if (p->ext.end_do_label == gfc_statement_label)
2648 if (p == gfc_state_stack)
2651 gfc_error ("End of nonblock DO statement at %C is within another block");
2655 /* At this point, the label doesn't terminate the innermost loop.
2656 Make sure it doesn't terminate another one. */
2657 for (; p; p = p->previous)
2658 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2660 gfc_error ("End of nonblock DO statement at %C is interwoven "
2661 "with another DO loop");
2669 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2670 handled inside of parse_executable(), because they aren't really
2674 parse_do_block (void)
2681 s.ext.end_do_label = new_st.label;
2683 if (new_st.ext.iterator != NULL)
2684 stree = new_st.ext.iterator->var->symtree;
2688 accept_statement (ST_DO);
2690 top = gfc_state_stack->tail;
2691 push_state (&s, COMP_DO, gfc_new_block);
2693 s.do_variable = stree;
2695 top->block = new_level (top);
2696 top->block->op = EXEC_DO;
2699 st = parse_executable (ST_NONE);
2707 if (s.ext.end_do_label != NULL
2708 && s.ext.end_do_label != gfc_statement_label)
2709 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2712 if (gfc_statement_label != NULL)
2714 new_st.op = EXEC_NOP;
2719 case ST_IMPLIED_ENDDO:
2720 /* If the do-stmt of this DO construct has a do-construct-name,
2721 the corresponding end-do must be an end-do-stmt (with a matching
2722 name, but in that case we must have seen ST_ENDDO first).
2723 We only complain about this in pedantic mode. */
2724 if (gfc_current_block () != NULL)
2725 gfc_error_now ("named block DO at %L requires matching ENDDO name",
2726 &gfc_current_block()->declared_at);
2731 unexpected_statement (st);
2736 accept_statement (st);
2740 /* Parse the statements of OpenMP do/parallel do. */
2742 static gfc_statement
2743 parse_omp_do (gfc_statement omp_st)
2749 accept_statement (omp_st);
2751 cp = gfc_state_stack->tail;
2752 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2753 np = new_level (cp);
2759 st = next_statement ();
2762 else if (st == ST_DO)
2765 unexpected_statement (st);
2769 if (gfc_statement_label != NULL
2770 && gfc_state_stack->previous != NULL
2771 && gfc_state_stack->previous->state == COMP_DO
2772 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2780 there should be no !$OMP END DO. */
2782 return ST_IMPLIED_ENDDO;
2785 check_do_closure ();
2788 st = next_statement ();
2789 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2791 if (new_st.op == EXEC_OMP_END_NOWAIT)
2792 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2794 gcc_assert (new_st.op == EXEC_NOP);
2795 gfc_clear_new_st ();
2796 gfc_commit_symbols ();
2797 gfc_warning_check ();
2798 st = next_statement ();
2804 /* Parse the statements of OpenMP atomic directive. */
2807 parse_omp_atomic (void)
2813 accept_statement (ST_OMP_ATOMIC);
2815 cp = gfc_state_stack->tail;
2816 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2817 np = new_level (cp);
2823 st = next_statement ();
2826 else if (st == ST_ASSIGNMENT)
2829 unexpected_statement (st);
2832 accept_statement (st);
2838 /* Parse the statements of an OpenMP structured block. */
2841 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
2843 gfc_statement st, omp_end_st;
2847 accept_statement (omp_st);
2849 cp = gfc_state_stack->tail;
2850 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2851 np = new_level (cp);
2857 case ST_OMP_PARALLEL:
2858 omp_end_st = ST_OMP_END_PARALLEL;
2860 case ST_OMP_PARALLEL_SECTIONS:
2861 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
2863 case ST_OMP_SECTIONS:
2864 omp_end_st = ST_OMP_END_SECTIONS;
2866 case ST_OMP_ORDERED:
2867 omp_end_st = ST_OMP_END_ORDERED;
2869 case ST_OMP_CRITICAL:
2870 omp_end_st = ST_OMP_END_CRITICAL;
2873 omp_end_st = ST_OMP_END_MASTER;
2876 omp_end_st = ST_OMP_END_SINGLE;
2879 omp_end_st = ST_OMP_END_TASK;
2881 case ST_OMP_WORKSHARE:
2882 omp_end_st = ST_OMP_END_WORKSHARE;
2884 case ST_OMP_PARALLEL_WORKSHARE:
2885 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
2893 if (workshare_stmts_only)
2895 /* Inside of !$omp workshare, only
2898 where statements and constructs
2899 forall statements and constructs
2903 are allowed. For !$omp critical these
2904 restrictions apply recursively. */
2907 st = next_statement ();
2918 accept_statement (st);
2921 case ST_WHERE_BLOCK:
2922 parse_where_block ();
2925 case ST_FORALL_BLOCK:
2926 parse_forall_block ();
2929 case ST_OMP_PARALLEL:
2930 case ST_OMP_PARALLEL_SECTIONS:
2931 parse_omp_structured_block (st, false);
2934 case ST_OMP_PARALLEL_WORKSHARE:
2935 case ST_OMP_CRITICAL:
2936 parse_omp_structured_block (st, true);
2939 case ST_OMP_PARALLEL_DO:
2940 st = parse_omp_do (st);
2944 parse_omp_atomic ();
2955 st = next_statement ();
2959 st = parse_executable (ST_NONE);
2962 else if (st == ST_OMP_SECTION
2963 && (omp_st == ST_OMP_SECTIONS
2964 || omp_st == ST_OMP_PARALLEL_SECTIONS))
2966 np = new_level (np);
2970 else if (st != omp_end_st)
2971 unexpected_statement (st);
2973 while (st != omp_end_st);
2977 case EXEC_OMP_END_NOWAIT:
2978 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2980 case EXEC_OMP_CRITICAL:
2981 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
2982 || (new_st.ext.omp_name != NULL
2983 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
2984 gfc_error ("Name after !$omp critical and !$omp end critical does "
2986 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
2988 case EXEC_OMP_END_SINGLE:
2989 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
2990 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
2991 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
2992 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3000 gfc_clear_new_st ();
3001 gfc_commit_symbols ();
3002 gfc_warning_check ();
3007 /* Accept a series of executable statements. We return the first
3008 statement that doesn't fit to the caller. Any block statements are
3009 passed on to the correct handler, which usually passes the buck
3012 static gfc_statement
3013 parse_executable (gfc_statement st)
3018 st = next_statement ();
3022 close_flag = check_do_closure ();
3027 case ST_END_PROGRAM:
3030 case ST_END_FUNCTION:
3034 case ST_END_SUBROUTINE:
3039 case ST_SELECT_CASE:
3040 gfc_error ("%s statement at %C cannot terminate a non-block "
3041 "DO loop", gfc_ascii_statement (st));
3057 accept_statement (st);
3058 if (close_flag == 1)
3059 return ST_IMPLIED_ENDDO;
3066 case ST_SELECT_CASE:
3067 parse_select_block ();
3072 if (check_do_closure () == 1)
3073 return ST_IMPLIED_ENDDO;
3076 case ST_WHERE_BLOCK:
3077 parse_where_block ();
3080 case ST_FORALL_BLOCK:
3081 parse_forall_block ();
3084 case ST_OMP_PARALLEL:
3085 case ST_OMP_PARALLEL_SECTIONS:
3086 case ST_OMP_SECTIONS:
3087 case ST_OMP_ORDERED:
3088 case ST_OMP_CRITICAL:
3092 parse_omp_structured_block (st, false);
3095 case ST_OMP_WORKSHARE:
3096 case ST_OMP_PARALLEL_WORKSHARE:
3097 parse_omp_structured_block (st, true);
3101 case ST_OMP_PARALLEL_DO:
3102 st = parse_omp_do (st);
3103 if (st == ST_IMPLIED_ENDDO)
3108 parse_omp_atomic ();
3115 st = next_statement ();
3120 /* Parse a series of contained program units. */
3122 static void parse_progunit (gfc_statement);
3125 /* Fix the symbols for sibling functions. These are incorrectly added to
3126 the child namespace as the parser didn't know about this procedure. */
3129 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3133 gfc_symbol *old_sym;
3135 sym->attr.referenced = 1;
3136 for (ns = siblings; ns; ns = ns->sibling)
3138 gfc_find_sym_tree (sym->name, ns, 0, &st);
3140 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3143 old_sym = st->n.sym;
3144 if (old_sym->ns == ns
3145 && !old_sym->attr.contained
3147 /* By 14.6.1.3, host association should be excluded
3148 for the following. */
3149 && !(old_sym->attr.external
3150 || (old_sym->ts.type != BT_UNKNOWN
3151 && !old_sym->attr.implicit_type)
3152 || old_sym->attr.flavor == FL_PARAMETER
3153 || old_sym->attr.in_common
3154 || old_sym->attr.in_equivalence
3155 || old_sym->attr.data
3156 || old_sym->attr.dummy
3157 || old_sym->attr.result
3158 || old_sym->attr.dimension
3159 || old_sym->attr.allocatable
3160 || old_sym->attr.intrinsic
3161 || old_sym->attr.generic
3162 || old_sym->attr.flavor == FL_NAMELIST
3163 || old_sym->attr.proc == PROC_ST_FUNCTION))
3165 /* Replace it with the symbol from the parent namespace. */
3169 /* Free the old (local) symbol. */
3171 if (old_sym->refs == 0)
3172 gfc_free_symbol (old_sym);
3175 /* Do the same for any contained procedures. */
3176 gfc_fixup_sibling_symbols (sym, ns->contained);
3181 parse_contained (int module)
3183 gfc_namespace *ns, *parent_ns, *tmp;
3184 gfc_state_data s1, s2;
3188 int contains_statements = 0;
3191 push_state (&s1, COMP_CONTAINS, NULL);
3192 parent_ns = gfc_current_ns;
3196 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3198 gfc_current_ns->sibling = parent_ns->contained;
3199 parent_ns->contained = gfc_current_ns;
3202 /* Process the next available statement. We come here if we got an error
3203 and rejected the last statement. */
3204 st = next_statement ();
3213 contains_statements = 1;
3214 accept_statement (st);
3217 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3220 /* For internal procedures, create/update the symbol in the
3221 parent namespace. */
3225 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3226 gfc_error ("Contained procedure '%s' at %C is already "
3227 "ambiguous", gfc_new_block->name);
3230 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3231 &gfc_new_block->declared_at) ==
3234 if (st == ST_FUNCTION)
3235 gfc_add_function (&sym->attr, sym->name,
3236 &gfc_new_block->declared_at);
3238 gfc_add_subroutine (&sym->attr, sym->name,
3239 &gfc_new_block->declared_at);
3243 gfc_commit_symbols ();
3246 sym = gfc_new_block;
3248 /* Mark this as a contained function, so it isn't replaced
3249 by other module functions. */
3250 sym->attr.contained = 1;
3251 sym->attr.referenced = 1;
3253 parse_progunit (ST_NONE);
3255 /* Fix up any sibling functions that refer to this one. */
3256 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3257 /* Or refer to any of its alternate entry points. */
3258 for (el = gfc_current_ns->entries; el; el = el->next)
3259 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3261 gfc_current_ns->code = s2.head;
3262 gfc_current_ns = parent_ns;
3267 /* These statements are associated with the end of the host unit. */
3268 case ST_END_FUNCTION:
3270 case ST_END_PROGRAM:
3271 case ST_END_SUBROUTINE:
3272 accept_statement (st);
3276 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3277 gfc_ascii_statement (st));
3278 reject_statement ();
3284 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3285 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3287 /* The first namespace in the list is guaranteed to not have
3288 anything (worthwhile) in it. */
3289 tmp = gfc_current_ns;
3290 gfc_current_ns = parent_ns;
3291 if (seen_error && tmp->refs > 1)
3292 gfc_free_namespace (tmp);
3294 ns = gfc_current_ns->contained;
3295 gfc_current_ns->contained = ns->sibling;
3296 gfc_free_namespace (ns);
3299 if (!contains_statements)
3300 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3301 "FUNCTION or SUBROUTINE statement at %C");
3305 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3308 parse_progunit (gfc_statement st)
3313 st = parse_spec (st);
3323 accept_statement (st);
3330 if (gfc_current_state () == COMP_FUNCTION)
3331 gfc_check_function_type (gfc_current_ns);
3336 st = parse_executable (st);
3347 accept_statement (st);
3354 unexpected_statement (st);
3355 reject_statement ();
3356 st = next_statement ();
3362 for (p = gfc_state_stack; p; p = p->previous)
3363 if (p->state == COMP_CONTAINS)
3366 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3371 gfc_error ("CONTAINS statement at %C is already in a contained "
3373 st = next_statement ();
3377 parse_contained (0);
3380 gfc_current_ns->code = gfc_state_stack->head;
3384 /* Come here to complain about a global symbol already in use as
3388 gfc_global_used (gfc_gsymbol *sym, locus *where)
3393 where = &gfc_current_locus;
3403 case GSYM_SUBROUTINE:
3404 name = "SUBROUTINE";
3409 case GSYM_BLOCK_DATA:
3410 name = "BLOCK DATA";
3416 gfc_internal_error ("gfc_global_used(): Bad type");
3420 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3421 sym->name, where, name, &sym->where);
3425 /* Parse a block data program unit. */
3428 parse_block_data (void)
3431 static locus blank_locus;
3432 static int blank_block=0;
3435 gfc_current_ns->proc_name = gfc_new_block;
3436 gfc_current_ns->is_block_data = 1;
3438 if (gfc_new_block == NULL)
3441 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3442 "prior BLOCK DATA at %L", &blank_locus);
3446 blank_locus = gfc_current_locus;
3451 s = gfc_get_gsymbol (gfc_new_block->name);
3453 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3454 gfc_global_used(s, NULL);
3457 s->type = GSYM_BLOCK_DATA;
3458 s->where = gfc_current_locus;
3463 st = parse_spec (ST_NONE);
3465 while (st != ST_END_BLOCK_DATA)
3467 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3468 gfc_ascii_statement (st));
3469 reject_statement ();
3470 st = next_statement ();
3475 /* Parse a module subprogram. */
3483 s = gfc_get_gsymbol (gfc_new_block->name);
3484 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3485 gfc_global_used(s, NULL);
3488 s->type = GSYM_MODULE;
3489 s->where = gfc_current_locus;
3493 st = parse_spec (ST_NONE);
3502 parse_contained (1);
3506 accept_statement (st);
3510 gfc_error ("Unexpected %s statement in MODULE at %C",
3511 gfc_ascii_statement (st));
3513 reject_statement ();
3514 st = next_statement ();
3520 /* Add a procedure name to the global symbol table. */
3523 add_global_procedure (int sub)
3527 s = gfc_get_gsymbol(gfc_new_block->name);
3530 || (s->type != GSYM_UNKNOWN
3531 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3532 gfc_global_used(s, NULL);
3535 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3536 s->where = gfc_current_locus;
3542 /* Add a program to the global symbol table. */
3545 add_global_program (void)
3549 if (gfc_new_block == NULL)
3551 s = gfc_get_gsymbol (gfc_new_block->name);
3553 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3554 gfc_global_used(s, NULL);
3557 s->type = GSYM_PROGRAM;
3558 s->where = gfc_current_locus;
3564 /* Top level parser. */
3567 gfc_parse_file (void)
3569 int seen_program, errors_before, errors;
3570 gfc_state_data top, s;
3574 gfc_start_source_files ();
3576 top.state = COMP_NONE;
3578 top.previous = NULL;
3579 top.head = top.tail = NULL;
3580 top.do_variable = NULL;
3582 gfc_state_stack = ⊤
3584 gfc_clear_new_st ();
3586 gfc_statement_label = NULL;
3588 if (setjmp (eof_buf))
3589 return FAILURE; /* Come here on unexpected EOF */
3593 /* Exit early for empty files. */
3599 st = next_statement ();
3608 goto duplicate_main;
3610 prog_locus = gfc_current_locus;
3612 push_state (&s, COMP_PROGRAM, gfc_new_block);
3613 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3614 accept_statement (st);
3615 add_global_program ();
3616 parse_progunit (ST_NONE);
3620 add_global_procedure (1);
3621 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3622 accept_statement (st);
3623 parse_progunit (ST_NONE);
3627 add_global_procedure (0);
3628 push_state (&s, COMP_FUNCTION, gfc_new_block);
3629 accept_statement (st);
3630 parse_progunit (ST_NONE);
3634 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3635 accept_statement (st);
3636 parse_block_data ();
3640 push_state (&s, COMP_MODULE, gfc_new_block);
3641 accept_statement (st);
3643 gfc_get_errors (NULL, &errors_before);
3647 /* Anything else starts a nameless main program block. */
3650 goto duplicate_main;
3652 prog_locus = gfc_current_locus;
3654 push_state (&s, COMP_PROGRAM, gfc_new_block);
3655 main_program_symbol (gfc_current_ns, "MAIN__");
3656 parse_progunit (st);
3660 gfc_current_ns->code = s.head;
3662 gfc_resolve (gfc_current_ns);
3664 /* Dump the parse tree if requested. */
3665 if (gfc_option.dump_parse_tree)
3666 gfc_dump_parse_tree (gfc_current_ns, stdout);
3668 gfc_get_errors (NULL, &errors);
3669 if (s.state == COMP_MODULE)
3671 gfc_dump_module (s.sym->name, errors_before == errors);
3673 gfc_generate_module_code (gfc_current_ns);
3678 gfc_generate_code (gfc_current_ns);
3686 gfc_end_source_files ();
3690 /* If we see a duplicate main program, shut down. If the second
3691 instance is an implied main program, i.e. data decls or executable
3692 statements, we're in for lots of errors. */
3693 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3694 reject_statement ();