2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
31 /* Current statement label. Zero means no statement label. Because new_st
32 can get wiped during statement matching, we have to keep it separate. */
34 gfc_st_label *gfc_statement_label;
36 static locus label_locus;
37 static jmp_buf eof_buf;
39 gfc_state_data *gfc_state_stack;
41 /* TODO: Re-order functions to kill these forward decls. */
42 static void check_statement_label (gfc_statement);
43 static void undo_new_statement (void);
44 static void reject_statement (void);
47 /* A sort of half-matching function. We try to match the word on the
48 input with the passed string. If this succeeds, we call the
49 keyword-dependent matching function that will match the rest of the
50 statement. For single keywords, the matching subroutine is
54 match_word (const char *str, match (*subr) (void), locus *old_locus)
69 gfc_current_locus = *old_locus;
77 /* Figure out what the next statement is, (mostly) regardless of
78 proper ordering. The do...while(0) is there to prevent if/else
81 #define match(keyword, subr, st) \
83 if (match_word(keyword, subr, &old_locus) == MATCH_YES) \
86 undo_new_statement (); \
90 /* This is a specialist version of decode_statement that is used
91 for the specification statements in a function, whose
92 characteristics are deferred into the specification statements.
93 eg.: INTEGER (king = mykind) foo ()
94 USE mymodule, ONLY mykind.....
95 The KIND parameter needs a return after USE or IMPORT, whereas
96 derived type declarations can occur anywhere, up the executable
97 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
98 out of the correct kind of specification statements. */
100 decode_specification_statement (void)
106 if (gfc_match_eos () == MATCH_YES)
109 old_locus = gfc_current_locus;
111 match ("import", gfc_match_import, ST_IMPORT);
112 match ("use", gfc_match_use, ST_USE);
114 if (gfc_current_block ()->ts.type != BT_DERIVED)
117 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
118 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
119 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
121 /* General statement matching: Instead of testing every possible
122 statement, we eliminate most possibilities by peeking at the
125 c = gfc_peek_ascii_char ();
130 match ("abstract% interface", gfc_match_abstract_interface,
135 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
142 match ("data", gfc_match_data, ST_DATA);
143 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
147 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
148 match ("entry% ", gfc_match_entry, ST_ENTRY);
149 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
150 match ("external", gfc_match_external, ST_ATTR_DECL);
154 match ("format", gfc_match_format, ST_FORMAT);
161 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
162 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
163 match ("interface", gfc_match_interface, ST_INTERFACE);
164 match ("intent", gfc_match_intent, ST_ATTR_DECL);
165 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
172 match ("namelist", gfc_match_namelist, ST_NAMELIST);
176 match ("optional", gfc_match_optional, ST_ATTR_DECL);
180 match ("parameter", gfc_match_parameter, ST_PARAMETER);
181 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
182 if (gfc_match_private (&st) == MATCH_YES)
184 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
185 if (gfc_match_public (&st) == MATCH_YES)
187 match ("protected", gfc_match_protected, ST_ATTR_DECL);
194 match ("save", gfc_match_save, ST_ATTR_DECL);
198 match ("target", gfc_match_target, ST_ATTR_DECL);
199 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
206 match ("value", gfc_match_value, ST_ATTR_DECL);
207 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
214 /* This is not a specification statement. See if any of the matchers
215 has stored an error message of some sort. */
219 gfc_buffer_error (0);
220 gfc_current_locus = old_locus;
222 return ST_GET_FCN_CHARACTERISTICS;
226 /* This is the primary 'decode_statement'. */
228 decode_statement (void)
239 gfc_clear_error (); /* Clear any pending errors. */
240 gfc_clear_warning (); /* Clear any pending warnings. */
242 gfc_matching_function = false;
244 if (gfc_match_eos () == MATCH_YES)
247 if (gfc_current_state () == COMP_FUNCTION
248 && gfc_current_block ()->result->ts.kind == -1)
249 return decode_specification_statement ();
251 old_locus = gfc_current_locus;
253 /* Try matching a data declaration or function declaration. The
254 input "REALFUNCTIONA(N)" can mean several things in different
255 contexts, so it (and its relatives) get special treatment. */
257 if (gfc_current_state () == COMP_NONE
258 || gfc_current_state () == COMP_INTERFACE
259 || gfc_current_state () == COMP_CONTAINS)
261 gfc_matching_function = true;
262 m = gfc_match_function_decl ();
265 else if (m == MATCH_ERROR)
269 gfc_current_locus = old_locus;
271 gfc_matching_function = false;
274 /* Match statements whose error messages are meant to be overwritten
275 by something better. */
277 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
278 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
279 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
281 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
282 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
284 /* Try to match a subroutine statement, which has the same optional
285 prefixes that functions can have. */
287 if (gfc_match_subroutine () == MATCH_YES)
288 return ST_SUBROUTINE;
290 gfc_current_locus = old_locus;
292 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
293 might begin with a block label. The match functions for these
294 statements are unusual in that their keyword is not seen before
295 the matcher is called. */
297 if (gfc_match_if (&st) == MATCH_YES)
300 gfc_current_locus = old_locus;
302 if (gfc_match_where (&st) == MATCH_YES)
305 gfc_current_locus = old_locus;
307 if (gfc_match_forall (&st) == MATCH_YES)
310 gfc_current_locus = old_locus;
312 match (NULL, gfc_match_do, ST_DO);
313 match (NULL, gfc_match_select, ST_SELECT_CASE);
315 /* General statement matching: Instead of testing every possible
316 statement, we eliminate most possibilities by peeking at the
319 c = gfc_peek_ascii_char ();
324 match ("abstract% interface", gfc_match_abstract_interface,
326 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
327 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
328 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
332 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
333 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
334 match (NULL, gfc_match_bind_c_stmt, ST_ATTR_DECL);
338 match ("call", gfc_match_call, ST_CALL);
339 match ("close", gfc_match_close, ST_CLOSE);
340 match ("continue", gfc_match_continue, ST_CONTINUE);
341 match ("cycle", gfc_match_cycle, ST_CYCLE);
342 match ("case", gfc_match_case, ST_CASE);
343 match ("common", gfc_match_common, ST_COMMON);
344 match ("contains", gfc_match_eos, ST_CONTAINS);
348 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
349 match ("data", gfc_match_data, ST_DATA);
350 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
354 match ("end file", gfc_match_endfile, ST_END_FILE);
355 match ("exit", gfc_match_exit, ST_EXIT);
356 match ("else", gfc_match_else, ST_ELSE);
357 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
358 match ("else if", gfc_match_elseif, ST_ELSEIF);
359 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
361 if (gfc_match_end (&st) == MATCH_YES)
364 match ("entry% ", gfc_match_entry, ST_ENTRY);
365 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
366 match ("external", gfc_match_external, ST_ATTR_DECL);
370 match ("final", gfc_match_final_decl, ST_FINAL);
371 match ("flush", gfc_match_flush, ST_FLUSH);
372 match ("format", gfc_match_format, ST_FORMAT);
376 match ("generic", gfc_match_generic, ST_GENERIC);
377 match ("go to", gfc_match_goto, ST_GOTO);
381 match ("inquire", gfc_match_inquire, ST_INQUIRE);
382 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
383 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
384 match ("import", gfc_match_import, ST_IMPORT);
385 match ("interface", gfc_match_interface, ST_INTERFACE);
386 match ("intent", gfc_match_intent, ST_ATTR_DECL);
387 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
391 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
392 match ("module", gfc_match_module, ST_MODULE);
396 match ("nullify", gfc_match_nullify, ST_NULLIFY);
397 match ("namelist", gfc_match_namelist, ST_NAMELIST);
401 match ("open", gfc_match_open, ST_OPEN);
402 match ("optional", gfc_match_optional, ST_ATTR_DECL);
406 match ("print", gfc_match_print, ST_WRITE);
407 match ("parameter", gfc_match_parameter, ST_PARAMETER);
408 match ("pause", gfc_match_pause, ST_PAUSE);
409 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
410 if (gfc_match_private (&st) == MATCH_YES)
412 match ("procedure", gfc_match_procedure, ST_PROCEDURE);
413 match ("program", gfc_match_program, ST_PROGRAM);
414 if (gfc_match_public (&st) == MATCH_YES)
416 match ("protected", gfc_match_protected, ST_ATTR_DECL);
420 match ("read", gfc_match_read, ST_READ);
421 match ("return", gfc_match_return, ST_RETURN);
422 match ("rewind", gfc_match_rewind, ST_REWIND);
426 match ("sequence", gfc_match_eos, ST_SEQUENCE);
427 match ("stop", gfc_match_stop, ST_STOP);
428 match ("save", gfc_match_save, ST_ATTR_DECL);
432 match ("target", gfc_match_target, ST_ATTR_DECL);
433 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
437 match ("use", gfc_match_use, ST_USE);
441 match ("value", gfc_match_value, ST_ATTR_DECL);
442 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
446 match ("wait", gfc_match_wait, ST_WAIT);
447 match ("write", gfc_match_write, ST_WRITE);
451 /* All else has failed, so give up. See if any of the matchers has
452 stored an error message of some sort. */
454 if (gfc_error_check () == 0)
455 gfc_error_now ("Unclassifiable statement at %C");
459 gfc_error_recovery ();
465 decode_omp_directive (void)
474 gfc_clear_error (); /* Clear any pending errors. */
475 gfc_clear_warning (); /* Clear any pending warnings. */
479 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
480 "or ELEMENTAL procedures");
481 gfc_error_recovery ();
485 old_locus = gfc_current_locus;
487 /* General OpenMP directive matching: Instead of testing every possible
488 statement, we eliminate most possibilities by peeking at the
491 c = gfc_peek_ascii_char ();
496 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
499 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
502 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
505 match ("do", gfc_match_omp_do, ST_OMP_DO);
508 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
509 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
510 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
511 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
512 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
513 match ("end parallel sections", gfc_match_omp_eos,
514 ST_OMP_END_PARALLEL_SECTIONS);
515 match ("end parallel workshare", gfc_match_omp_eos,
516 ST_OMP_END_PARALLEL_WORKSHARE);
517 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
518 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
519 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
520 match ("end task", gfc_match_omp_eos, ST_OMP_END_TASK);
521 match ("end workshare", gfc_match_omp_end_nowait,
522 ST_OMP_END_WORKSHARE);
525 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
528 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
531 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
534 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
535 match ("parallel sections", gfc_match_omp_parallel_sections,
536 ST_OMP_PARALLEL_SECTIONS);
537 match ("parallel workshare", gfc_match_omp_parallel_workshare,
538 ST_OMP_PARALLEL_WORKSHARE);
539 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
542 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
543 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
544 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
547 match ("task", gfc_match_omp_task, ST_OMP_TASK);
548 match ("taskwait", gfc_match_omp_taskwait, ST_OMP_TASKWAIT);
549 match ("threadprivate", gfc_match_omp_threadprivate,
550 ST_OMP_THREADPRIVATE);
552 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
556 /* All else has failed, so give up. See if any of the matchers has
557 stored an error message of some sort. */
559 if (gfc_error_check () == 0)
560 gfc_error_now ("Unclassifiable OpenMP directive at %C");
564 gfc_error_recovery ();
570 decode_gcc_attribute (void)
578 gfc_clear_error (); /* Clear any pending errors. */
579 gfc_clear_warning (); /* Clear any pending warnings. */
580 old_locus = gfc_current_locus;
582 match ("attributes", gfc_match_gcc_attributes, ST_ATTR_DECL);
584 /* All else has failed, so give up. See if any of the matchers has
585 stored an error message of some sort. */
587 if (gfc_error_check () == 0)
588 gfc_error_now ("Unclassifiable GCC directive at %C");
592 gfc_error_recovery ();
600 /* Get the next statement in free form source. */
609 at_bol = gfc_at_bol ();
610 gfc_gobble_whitespace ();
612 c = gfc_peek_ascii_char ();
618 /* Found a statement label? */
619 m = gfc_match_st_label (&gfc_statement_label);
621 d = gfc_peek_ascii_char ();
622 if (m != MATCH_YES || !gfc_is_whitespace (d))
624 gfc_match_small_literal_int (&i, &cnt);
627 gfc_error_now ("Too many digits in statement label at %C");
630 gfc_error_now ("Zero is not a valid statement label at %C");
633 c = gfc_next_ascii_char ();
636 if (!gfc_is_whitespace (c))
637 gfc_error_now ("Non-numeric character in statement label at %C");
643 label_locus = gfc_current_locus;
645 gfc_gobble_whitespace ();
647 if (at_bol && gfc_peek_ascii_char () == ';')
649 gfc_error_now ("Semicolon at %C needs to be preceded by "
651 gfc_next_ascii_char (); /* Eat up the semicolon. */
655 if (gfc_match_eos () == MATCH_YES)
657 gfc_warning_now ("Ignoring statement label in empty statement "
659 gfc_free_st_label (gfc_statement_label);
660 gfc_statement_label = NULL;
667 /* Comments have already been skipped by the time we get here,
668 except for GCC attributes and OpenMP directives. */
670 gfc_next_ascii_char (); /* Eat up the exclamation sign. */
671 c = gfc_peek_ascii_char ();
677 c = gfc_next_ascii_char ();
678 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
679 gcc_assert (c == "gcc$"[i]);
681 gfc_gobble_whitespace ();
682 return decode_gcc_attribute ();
685 else if (c == '$' && gfc_option.flag_openmp)
689 c = gfc_next_ascii_char ();
690 for (i = 0; i < 4; i++, c = gfc_next_ascii_char ())
691 gcc_assert (c == "$omp"[i]);
693 gcc_assert (c == ' ' || c == '\t');
694 gfc_gobble_whitespace ();
695 return decode_omp_directive ();
701 if (at_bol && c == ';')
703 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
704 gfc_next_ascii_char (); /* Eat up the semicolon. */
708 return decode_statement ();
712 /* Get the next statement in fixed-form source. */
717 int label, digit_flag, i;
722 return decode_statement ();
724 /* Skip past the current label field, parsing a statement label if
725 one is there. This is a weird number parser, since the number is
726 contained within five columns and can have any kind of embedded
727 spaces. We also check for characters that make the rest of the
733 for (i = 0; i < 5; i++)
735 c = gfc_next_char_literal (0);
752 label = label * 10 + ((unsigned char) c - '0');
753 label_locus = gfc_current_locus;
757 /* Comments have already been skipped by the time we get
758 here, except for GCC attributes and OpenMP directives. */
761 c = gfc_next_char_literal (0);
763 if (TOLOWER (c) == 'g')
765 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
766 gcc_assert (TOLOWER (c) == "gcc$"[i]);
768 return decode_gcc_attribute ();
770 else if (c == '$' && gfc_option.flag_openmp)
772 for (i = 0; i < 4; i++, c = gfc_next_char_literal (0))
773 gcc_assert ((char) gfc_wide_tolower (c) == "$omp"[i]);
775 if (c != ' ' && c != '0')
777 gfc_buffer_error (0);
778 gfc_error ("Bad continuation line at %C");
782 return decode_omp_directive ();
786 /* Comments have already been skipped by the time we get
787 here so don't bother checking for them. */
790 gfc_buffer_error (0);
791 gfc_error ("Non-numeric character in statement label at %C");
799 gfc_warning_now ("Zero is not a valid statement label at %C");
802 /* We've found a valid statement label. */
803 gfc_statement_label = gfc_get_st_label (label);
807 /* Since this line starts a statement, it cannot be a continuation
808 of a previous statement. If we see something here besides a
809 space or zero, it must be a bad continuation line. */
811 c = gfc_next_char_literal (0);
815 if (c != ' ' && c != '0')
817 gfc_buffer_error (0);
818 gfc_error ("Bad continuation line at %C");
822 /* Now that we've taken care of the statement label columns, we have
823 to make sure that the first nonblank character is not a '!'. If
824 it is, the rest of the line is a comment. */
828 loc = gfc_current_locus;
829 c = gfc_next_char_literal (0);
831 while (gfc_is_whitespace (c));
835 gfc_current_locus = loc;
839 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
843 if (gfc_match_eos () == MATCH_YES)
846 /* At this point, we've got a nonblank statement to parse. */
847 return decode_statement ();
851 gfc_warning ("Ignoring statement label in empty statement at %C");
853 gfc_current_locus.lb->truncated = 0;
859 /* Return the next non-ST_NONE statement to the caller. We also worry
860 about including files and the ends of include files at this stage. */
863 next_statement (void)
868 gfc_new_block = NULL;
870 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
873 gfc_statement_label = NULL;
874 gfc_buffer_error (1);
879 gfc_skip_comments ();
887 if (gfc_define_undef_line ())
890 old_locus = gfc_current_locus;
892 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
898 gfc_buffer_error (0);
900 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
902 gfc_free_st_label (gfc_statement_label);
903 gfc_statement_label = NULL;
904 gfc_current_locus = old_locus;
908 check_statement_label (st);
914 /****************************** Parser ***********************************/
916 /* The parser subroutines are of type 'try' that fail if the file ends
919 /* Macros that expand to case-labels for various classes of
920 statements. Start with executable statements that directly do
923 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
924 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
925 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
926 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
927 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
928 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
929 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
930 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
931 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
933 /* Statements that mark other executable statements. */
935 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
936 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
937 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
938 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
939 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
940 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
943 /* Declaration statements */
945 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
946 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
947 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
950 /* Block end statements. Errors associated with interchanging these
951 are detected in gfc_match_end(). */
953 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
954 case ST_END_PROGRAM: case ST_END_SUBROUTINE
957 /* Push a new state onto the stack. */
960 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
962 p->state = new_state;
963 p->previous = gfc_state_stack;
965 p->head = p->tail = NULL;
966 p->do_variable = NULL;
971 /* Pop the current state. */
975 gfc_state_stack = gfc_state_stack->previous;
979 /* Try to find the given state in the state stack. */
982 gfc_find_state (gfc_compile_state state)
986 for (p = gfc_state_stack; p; p = p->previous)
987 if (p->state == state)
990 return (p == NULL) ? FAILURE : SUCCESS;
994 /* Starts a new level in the statement list. */
997 new_level (gfc_code *q)
1001 p = q->block = gfc_get_code ();
1003 gfc_state_stack->head = gfc_state_stack->tail = p;
1009 /* Add the current new_st code structure and adds it to the current
1010 program unit. As a side-effect, it zeroes the new_st. */
1013 add_statement (void)
1017 p = gfc_get_code ();
1020 p->loc = gfc_current_locus;
1022 if (gfc_state_stack->head == NULL)
1023 gfc_state_stack->head = p;
1025 gfc_state_stack->tail->next = p;
1027 while (p->next != NULL)
1030 gfc_state_stack->tail = p;
1032 gfc_clear_new_st ();
1038 /* Frees everything associated with the current statement. */
1041 undo_new_statement (void)
1043 gfc_free_statements (new_st.block);
1044 gfc_free_statements (new_st.next);
1045 gfc_free_statement (&new_st);
1046 gfc_clear_new_st ();
1050 /* If the current statement has a statement label, make sure that it
1051 is allowed to, or should have one. */
1054 check_statement_label (gfc_statement st)
1058 if (gfc_statement_label == NULL)
1060 if (st == ST_FORMAT)
1061 gfc_error ("FORMAT statement at %L does not have a statement label",
1068 case ST_END_PROGRAM:
1069 case ST_END_FUNCTION:
1070 case ST_END_SUBROUTINE:
1076 type = ST_LABEL_TARGET;
1080 type = ST_LABEL_FORMAT;
1083 /* Statement labels are not restricted from appearing on a
1084 particular line. However, there are plenty of situations
1085 where the resulting label can't be referenced. */
1088 type = ST_LABEL_BAD_TARGET;
1092 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1094 new_st.here = gfc_statement_label;
1098 /* Figures out what the enclosing program unit is. This will be a
1099 function, subroutine, program, block data or module. */
1102 gfc_enclosing_unit (gfc_compile_state * result)
1106 for (p = gfc_state_stack; p; p = p->previous)
1107 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1108 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1109 || p->state == COMP_PROGRAM)
1118 *result = COMP_PROGRAM;
1123 /* Translate a statement enum to a string. */
1126 gfc_ascii_statement (gfc_statement st)
1132 case ST_ARITHMETIC_IF:
1133 p = _("arithmetic IF");
1139 p = _("attribute declaration");
1169 p = _("data declaration");
1177 case ST_DERIVED_DECL:
1178 p = _("derived type declaration");
1192 case ST_END_BLOCK_DATA:
1193 p = "END BLOCK DATA";
1204 case ST_END_FUNCTION:
1210 case ST_END_INTERFACE:
1211 p = "END INTERFACE";
1216 case ST_END_PROGRAM:
1222 case ST_END_SUBROUTINE:
1223 p = "END SUBROUTINE";
1234 case ST_EQUIVALENCE:
1243 case ST_FORALL_BLOCK: /* Fall through */
1265 case ST_IMPLICIT_NONE:
1266 p = "IMPLICIT NONE";
1268 case ST_IMPLIED_ENDDO:
1269 p = _("implied END DO");
1295 case ST_MODULE_PROC:
1296 p = "MODULE PROCEDURE";
1334 case ST_WHERE_BLOCK: /* Fall through */
1345 p = _("assignment");
1347 case ST_POINTER_ASSIGNMENT:
1348 p = _("pointer assignment");
1350 case ST_SELECT_CASE:
1359 case ST_STATEMENT_FUNCTION:
1360 p = "STATEMENT FUNCTION";
1362 case ST_LABEL_ASSIGNMENT:
1363 p = "LABEL ASSIGNMENT";
1366 p = "ENUM DEFINITION";
1369 p = "ENUMERATOR DEFINITION";
1377 case ST_OMP_BARRIER:
1378 p = "!$OMP BARRIER";
1380 case ST_OMP_CRITICAL:
1381 p = "!$OMP CRITICAL";
1386 case ST_OMP_END_CRITICAL:
1387 p = "!$OMP END CRITICAL";
1392 case ST_OMP_END_MASTER:
1393 p = "!$OMP END MASTER";
1395 case ST_OMP_END_ORDERED:
1396 p = "!$OMP END ORDERED";
1398 case ST_OMP_END_PARALLEL:
1399 p = "!$OMP END PARALLEL";
1401 case ST_OMP_END_PARALLEL_DO:
1402 p = "!$OMP END PARALLEL DO";
1404 case ST_OMP_END_PARALLEL_SECTIONS:
1405 p = "!$OMP END PARALLEL SECTIONS";
1407 case ST_OMP_END_PARALLEL_WORKSHARE:
1408 p = "!$OMP END PARALLEL WORKSHARE";
1410 case ST_OMP_END_SECTIONS:
1411 p = "!$OMP END SECTIONS";
1413 case ST_OMP_END_SINGLE:
1414 p = "!$OMP END SINGLE";
1416 case ST_OMP_END_TASK:
1417 p = "!$OMP END TASK";
1419 case ST_OMP_END_WORKSHARE:
1420 p = "!$OMP END WORKSHARE";
1428 case ST_OMP_ORDERED:
1429 p = "!$OMP ORDERED";
1431 case ST_OMP_PARALLEL:
1432 p = "!$OMP PARALLEL";
1434 case ST_OMP_PARALLEL_DO:
1435 p = "!$OMP PARALLEL DO";
1437 case ST_OMP_PARALLEL_SECTIONS:
1438 p = "!$OMP PARALLEL SECTIONS";
1440 case ST_OMP_PARALLEL_WORKSHARE:
1441 p = "!$OMP PARALLEL WORKSHARE";
1443 case ST_OMP_SECTIONS:
1444 p = "!$OMP SECTIONS";
1446 case ST_OMP_SECTION:
1447 p = "!$OMP SECTION";
1455 case ST_OMP_TASKWAIT:
1456 p = "!$OMP TASKWAIT";
1458 case ST_OMP_THREADPRIVATE:
1459 p = "!$OMP THREADPRIVATE";
1461 case ST_OMP_WORKSHARE:
1462 p = "!$OMP WORKSHARE";
1465 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1472 /* Create a symbol for the main program and assign it to ns->proc_name. */
1475 main_program_symbol (gfc_namespace *ns, const char *name)
1477 gfc_symbol *main_program;
1478 symbol_attribute attr;
1480 gfc_get_symbol (name, ns, &main_program);
1481 gfc_clear_attr (&attr);
1482 attr.flavor = FL_PROGRAM;
1483 attr.proc = PROC_UNKNOWN;
1484 attr.subroutine = 1;
1485 attr.access = ACCESS_PUBLIC;
1486 attr.is_main_program = 1;
1487 main_program->attr = attr;
1488 main_program->declared_at = gfc_current_locus;
1489 ns->proc_name = main_program;
1490 gfc_commit_symbols ();
1494 /* Do whatever is necessary to accept the last statement. */
1497 accept_statement (gfc_statement st)
1505 case ST_IMPLICIT_NONE:
1506 gfc_set_implicit_none ();
1515 gfc_current_ns->proc_name = gfc_new_block;
1518 /* If the statement is the end of a block, lay down a special code
1519 that allows a branch to the end of the block from within the
1520 construct. IF and SELECT are treated differently from DO
1521 (where EXEC_NOP is added inside the loop) for two
1523 1. END DO has a meaning in the sense that after a GOTO to
1524 it, the loop counter must be increased.
1525 2. IF blocks and SELECT blocks can consist of multiple
1526 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1527 Putting the label before the END IF would make the jump
1528 from, say, the ELSE IF block to the END IF illegal. */
1532 if (gfc_statement_label != NULL)
1534 new_st.op = EXEC_END_BLOCK;
1539 /* The end-of-program unit statements do not get the special
1540 marker and require a statement of some sort if they are a
1543 case ST_END_PROGRAM:
1544 case ST_END_FUNCTION:
1545 case ST_END_SUBROUTINE:
1546 if (gfc_statement_label != NULL)
1548 new_st.op = EXEC_RETURN;
1553 new_st.op = EXEC_END_PROCEDURE;
1569 gfc_commit_symbols ();
1570 gfc_warning_check ();
1571 gfc_clear_new_st ();
1575 /* Undo anything tentative that has been built for the current
1579 reject_statement (void)
1581 /* Revert to the previous charlen chain. */
1582 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1583 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1585 gfc_new_block = NULL;
1586 gfc_undo_symbols ();
1587 gfc_clear_warning ();
1588 undo_new_statement ();
1592 /* Generic complaint about an out of order statement. We also do
1593 whatever is necessary to clean up. */
1596 unexpected_statement (gfc_statement st)
1598 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1600 reject_statement ();
1604 /* Given the next statement seen by the matcher, make sure that it is
1605 in proper order with the last. This subroutine is initialized by
1606 calling it with an argument of ST_NONE. If there is a problem, we
1607 issue an error and return FAILURE. Otherwise we return SUCCESS.
1609 Individual parsers need to verify that the statements seen are
1610 valid before calling here, i.e., ENTRY statements are not allowed in
1611 INTERFACE blocks. The following diagram is taken from the standard:
1613 +---------------------------------------+
1614 | program subroutine function module |
1615 +---------------------------------------+
1617 +---------------------------------------+
1619 +---------------------------------------+
1621 | +-----------+------------------+
1622 | | parameter | implicit |
1623 | +-----------+------------------+
1624 | format | | derived type |
1625 | entry | parameter | interface |
1626 | | data | specification |
1627 | | | statement func |
1628 | +-----------+------------------+
1629 | | data | executable |
1630 +--------+-----------+------------------+
1632 +---------------------------------------+
1633 | internal module/subprogram |
1634 +---------------------------------------+
1636 +---------------------------------------+
1645 ORDER_IMPLICIT_NONE,
1653 enum state_order state;
1654 gfc_statement last_statement;
1660 verify_st_order (st_state *p, gfc_statement st, bool silent)
1666 p->state = ORDER_START;
1670 if (p->state > ORDER_USE)
1672 p->state = ORDER_USE;
1676 if (p->state > ORDER_IMPORT)
1678 p->state = ORDER_IMPORT;
1681 case ST_IMPLICIT_NONE:
1682 if (p->state > ORDER_IMPLICIT_NONE)
1685 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1686 statement disqualifies a USE but not an IMPLICIT NONE.
1687 Duplicate IMPLICIT NONEs are caught when the implicit types
1690 p->state = ORDER_IMPLICIT_NONE;
1694 if (p->state > ORDER_IMPLICIT)
1696 p->state = ORDER_IMPLICIT;
1701 if (p->state < ORDER_IMPLICIT_NONE)
1702 p->state = ORDER_IMPLICIT_NONE;
1706 if (p->state >= ORDER_EXEC)
1708 if (p->state < ORDER_IMPLICIT)
1709 p->state = ORDER_IMPLICIT;
1713 if (p->state < ORDER_SPEC)
1714 p->state = ORDER_SPEC;
1719 case ST_DERIVED_DECL:
1721 if (p->state >= ORDER_EXEC)
1723 if (p->state < ORDER_SPEC)
1724 p->state = ORDER_SPEC;
1729 if (p->state < ORDER_EXEC)
1730 p->state = ORDER_EXEC;
1734 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1735 gfc_ascii_statement (st));
1738 /* All is well, record the statement in case we need it next time. */
1739 p->where = gfc_current_locus;
1740 p->last_statement = st;
1745 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1746 gfc_ascii_statement (st),
1747 gfc_ascii_statement (p->last_statement), &p->where);
1753 /* Handle an unexpected end of file. This is a show-stopper... */
1755 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1758 unexpected_eof (void)
1762 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1764 /* Memory cleanup. Move to "second to last". */
1765 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1768 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1771 longjmp (eof_buf, 1);
1775 /* Parse the CONTAINS section of a derived type definition. */
1777 gfc_access gfc_typebound_default_access;
1780 parse_derived_contains (void)
1783 bool seen_private = false;
1784 bool seen_comps = false;
1785 bool error_flag = false;
1788 gcc_assert (gfc_current_state () == COMP_DERIVED);
1789 gcc_assert (gfc_current_block ());
1791 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1793 if (gfc_current_block ()->attr.sequence)
1794 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1795 " section at %C", gfc_current_block ()->name);
1796 if (gfc_current_block ()->attr.is_bind_c)
1797 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1798 " section at %C", gfc_current_block ()->name);
1800 accept_statement (ST_CONTAINS);
1801 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1803 gfc_typebound_default_access = ACCESS_PUBLIC;
1809 st = next_statement ();
1817 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1822 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1823 " procedure at %C") == FAILURE)
1826 accept_statement (ST_PROCEDURE);
1831 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1832 " at %C") == FAILURE)
1835 accept_statement (ST_GENERIC);
1840 if (gfc_notify_std (GFC_STD_F2003,
1841 "Fortran 2003: FINAL procedure declaration"
1842 " at %C") == FAILURE)
1845 accept_statement (ST_FINAL);
1853 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1854 "definition at %C with empty CONTAINS "
1855 "section") == FAILURE))
1858 /* ST_END_TYPE is accepted by parse_derived after return. */
1862 if (gfc_find_state (COMP_MODULE) == FAILURE)
1864 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1872 gfc_error ("PRIVATE statement at %C must precede procedure"
1880 gfc_error ("Duplicate PRIVATE statement at %C");
1884 accept_statement (ST_PRIVATE);
1885 gfc_typebound_default_access = ACCESS_PRIVATE;
1886 seen_private = true;
1890 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1895 gfc_error ("Already inside a CONTAINS block at %C");
1900 unexpected_statement (st);
1906 gcc_assert (gfc_current_state () == COMP_DERIVED);
1912 /* Parse a derived type. */
1915 parse_derived (void)
1917 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1920 gfc_symbol *derived_sym = NULL;
1926 accept_statement (ST_DERIVED_DECL);
1927 push_state (&s, COMP_DERIVED, gfc_new_block);
1929 gfc_new_block->component_access = ACCESS_PUBLIC;
1936 while (compiling_type)
1938 st = next_statement ();
1946 accept_statement (st);
1951 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1960 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1961 "definition at %C without components")
1965 accept_statement (ST_END_TYPE);
1969 if (gfc_find_state (COMP_MODULE) == FAILURE)
1971 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1979 gfc_error ("PRIVATE statement at %C must precede "
1980 "structure components");
1987 gfc_error ("Duplicate PRIVATE statement at %C");
1991 s.sym->component_access = ACCESS_PRIVATE;
1993 accept_statement (ST_PRIVATE);
2000 gfc_error ("SEQUENCE statement at %C must precede "
2001 "structure components");
2006 if (gfc_current_block ()->attr.sequence)
2007 gfc_warning ("SEQUENCE attribute at %C already specified in "
2012 gfc_error ("Duplicate SEQUENCE statement at %C");
2017 gfc_add_sequence (&gfc_current_block ()->attr,
2018 gfc_current_block ()->name, NULL);
2022 if (gfc_notify_std (GFC_STD_F2003,
2023 "Fortran 2003: CONTAINS block in derived type"
2024 " definition at %C") == FAILURE)
2027 accept_statement (ST_CONTAINS);
2028 if (parse_derived_contains ())
2033 unexpected_statement (st);
2038 /* need to verify that all fields of the derived type are
2039 * interoperable with C if the type is declared to be bind(c)
2041 derived_sym = gfc_current_block();
2043 sym = gfc_current_block ();
2044 for (c = sym->components; c; c = c->next)
2046 /* Look for allocatable components. */
2047 if (c->attr.allocatable
2048 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2049 sym->attr.alloc_comp = 1;
2051 /* Look for pointer components. */
2053 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2054 sym->attr.pointer_comp = 1;
2056 /* Look for procedure pointer components. */
2057 if (c->attr.proc_pointer
2058 || (c->ts.type == BT_DERIVED
2059 && c->ts.u.derived->attr.proc_pointer_comp))
2060 sym->attr.proc_pointer_comp = 1;
2062 /* Look for private components. */
2063 if (sym->component_access == ACCESS_PRIVATE
2064 || c->attr.access == ACCESS_PRIVATE
2065 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2066 sym->attr.private_comp = 1;
2069 if (!seen_component)
2070 sym->attr.zero_comp = 1;
2076 /* Parse an ENUM. */
2085 int seen_enumerator = 0;
2089 push_state (&s, COMP_ENUM, gfc_new_block);
2093 while (compiling_enum)
2095 st = next_statement ();
2103 seen_enumerator = 1;
2104 accept_statement (st);
2109 if (!seen_enumerator)
2111 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2114 accept_statement (st);
2118 gfc_free_enum_history ();
2119 unexpected_statement (st);
2127 /* Parse an interface. We must be able to deal with the possibility
2128 of recursive interfaces. The parse_spec() subroutine is mutually
2129 recursive with parse_interface(). */
2131 static gfc_statement parse_spec (gfc_statement);
2134 parse_interface (void)
2136 gfc_compile_state new_state = COMP_NONE, current_state;
2137 gfc_symbol *prog_unit, *sym;
2138 gfc_interface_info save;
2139 gfc_state_data s1, s2;
2143 accept_statement (ST_INTERFACE);
2145 current_interface.ns = gfc_current_ns;
2146 save = current_interface;
2148 sym = (current_interface.type == INTERFACE_GENERIC
2149 || current_interface.type == INTERFACE_USER_OP)
2150 ? gfc_new_block : NULL;
2152 push_state (&s1, COMP_INTERFACE, sym);
2153 current_state = COMP_NONE;
2156 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2158 st = next_statement ();
2166 if (st == ST_SUBROUTINE)
2167 new_state = COMP_SUBROUTINE;
2168 else if (st == ST_FUNCTION)
2169 new_state = COMP_FUNCTION;
2170 if (gfc_new_block->attr.pointer)
2172 gfc_new_block->attr.pointer = 0;
2173 gfc_new_block->attr.proc_pointer = 1;
2175 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2176 gfc_new_block->formal, NULL) == FAILURE)
2178 reject_statement ();
2179 gfc_free_namespace (gfc_current_ns);
2185 case ST_MODULE_PROC: /* The module procedure matcher makes
2186 sure the context is correct. */
2187 accept_statement (st);
2188 gfc_free_namespace (gfc_current_ns);
2191 case ST_END_INTERFACE:
2192 gfc_free_namespace (gfc_current_ns);
2193 gfc_current_ns = current_interface.ns;
2197 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2198 gfc_ascii_statement (st));
2199 reject_statement ();
2200 gfc_free_namespace (gfc_current_ns);
2205 /* Make sure that a generic interface has only subroutines or
2206 functions and that the generic name has the right attribute. */
2207 if (current_interface.type == INTERFACE_GENERIC)
2209 if (current_state == COMP_NONE)
2211 if (new_state == COMP_FUNCTION)
2212 gfc_add_function (&sym->attr, sym->name, NULL);
2213 else if (new_state == COMP_SUBROUTINE)
2214 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2216 current_state = new_state;
2220 if (new_state != current_state)
2222 if (new_state == COMP_SUBROUTINE)
2223 gfc_error ("SUBROUTINE at %C does not belong in a "
2224 "generic function interface");
2226 if (new_state == COMP_FUNCTION)
2227 gfc_error ("FUNCTION at %C does not belong in a "
2228 "generic subroutine interface");
2233 if (current_interface.type == INTERFACE_ABSTRACT)
2235 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2236 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2237 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2238 "cannot be the same as an intrinsic type",
2239 gfc_new_block->name);
2242 push_state (&s2, new_state, gfc_new_block);
2243 accept_statement (st);
2244 prog_unit = gfc_new_block;
2245 prog_unit->formal_ns = gfc_current_ns;
2246 proc_locus = gfc_current_locus;
2249 /* Read data declaration statements. */
2250 st = parse_spec (ST_NONE);
2252 /* Since the interface block does not permit an IMPLICIT statement,
2253 the default type for the function or the result must be taken
2254 from the formal namespace. */
2255 if (new_state == COMP_FUNCTION)
2257 if (prog_unit->result == prog_unit
2258 && prog_unit->ts.type == BT_UNKNOWN)
2259 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2260 else if (prog_unit->result != prog_unit
2261 && prog_unit->result->ts.type == BT_UNKNOWN)
2262 gfc_set_default_type (prog_unit->result, 1,
2263 prog_unit->formal_ns);
2266 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2268 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2269 gfc_ascii_statement (st));
2270 reject_statement ();
2274 /* Add EXTERNAL attribute to function or subroutine. */
2275 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2276 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2278 current_interface = save;
2279 gfc_add_interface (prog_unit);
2282 if (current_interface.ns
2283 && current_interface.ns->proc_name
2284 && strcmp (current_interface.ns->proc_name->name,
2285 prog_unit->name) == 0)
2286 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2287 "enclosing procedure", prog_unit->name, &proc_locus);
2296 /* Associate function characteristics by going back to the function
2297 declaration and rematching the prefix. */
2300 match_deferred_characteristics (gfc_typespec * ts)
2303 match m = MATCH_ERROR;
2304 char name[GFC_MAX_SYMBOL_LEN + 1];
2306 loc = gfc_current_locus;
2308 gfc_current_locus = gfc_current_block ()->declared_at;
2311 gfc_buffer_error (1);
2312 m = gfc_match_prefix (ts);
2313 gfc_buffer_error (0);
2315 if (ts->type == BT_DERIVED)
2319 if (!ts->u.derived || !ts->u.derived->components)
2323 /* Only permit one go at the characteristic association. */
2327 /* Set the function locus correctly. If we have not found the
2328 function name, there is an error. */
2330 && gfc_match ("function% %n", name) == MATCH_YES
2331 && strcmp (name, gfc_current_block ()->name) == 0)
2333 gfc_current_block ()->declared_at = gfc_current_locus;
2334 gfc_commit_symbols ();
2339 gfc_current_locus =loc;
2344 /* Check specification-expressions in the function result of the currently
2345 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2346 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2347 scope are not yet parsed so this has to be delayed up to parse_spec. */
2350 check_function_result_typed (void)
2352 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2354 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2355 gcc_assert (ts->type != BT_UNKNOWN);
2357 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2358 /* TODO: Extend when KIND type parameters are implemented. */
2359 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2360 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2364 /* Parse a set of specification statements. Returns the statement
2365 that doesn't fit. */
2367 static gfc_statement
2368 parse_spec (gfc_statement st)
2371 bool function_result_typed = false;
2372 bool bad_characteristic = false;
2375 verify_st_order (&ss, ST_NONE, false);
2377 st = next_statement ();
2379 /* If we are not inside a function or don't have a result specified so far,
2380 do nothing special about it. */
2381 if (gfc_current_state () != COMP_FUNCTION)
2382 function_result_typed = true;
2385 gfc_symbol* proc = gfc_current_ns->proc_name;
2388 if (proc->result->ts.type == BT_UNKNOWN)
2389 function_result_typed = true;
2394 /* If we find a statement that can not be followed by an IMPLICIT statement
2395 (and thus we can expect to see none any further), type the function result
2396 if it has not yet been typed. Be careful not to give the END statement
2397 to verify_st_order! */
2398 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2400 bool verify_now = false;
2402 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2407 verify_st_order (&dummyss, ST_NONE, false);
2408 verify_st_order (&dummyss, st, false);
2410 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2416 check_function_result_typed ();
2417 function_result_typed = true;
2426 case ST_IMPLICIT_NONE:
2428 if (!function_result_typed)
2430 check_function_result_typed ();
2431 function_result_typed = true;
2437 case ST_DATA: /* Not allowed in interfaces */
2438 if (gfc_current_state () == COMP_INTERFACE)
2448 case ST_DERIVED_DECL:
2451 if (verify_st_order (&ss, st, false) == FAILURE)
2453 reject_statement ();
2454 st = next_statement ();
2464 case ST_DERIVED_DECL:
2470 if (gfc_current_state () != COMP_MODULE)
2472 gfc_error ("%s statement must appear in a MODULE",
2473 gfc_ascii_statement (st));
2477 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2479 gfc_error ("%s statement at %C follows another accessibility "
2480 "specification", gfc_ascii_statement (st));
2484 gfc_current_ns->default_access = (st == ST_PUBLIC)
2485 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2489 case ST_STATEMENT_FUNCTION:
2490 if (gfc_current_state () == COMP_MODULE)
2492 unexpected_statement (st);
2500 accept_statement (st);
2501 st = next_statement ();
2505 accept_statement (st);
2507 st = next_statement ();
2510 case ST_GET_FCN_CHARACTERISTICS:
2511 /* This statement triggers the association of a function's result
2513 ts = &gfc_current_block ()->result->ts;
2514 if (match_deferred_characteristics (ts) != MATCH_YES)
2515 bad_characteristic = true;
2517 st = next_statement ();
2524 /* If match_deferred_characteristics failed, then there is an error. */
2525 if (bad_characteristic)
2527 ts = &gfc_current_block ()->result->ts;
2528 if (ts->type != BT_DERIVED)
2529 gfc_error ("Bad kind expression for function '%s' at %L",
2530 gfc_current_block ()->name,
2531 &gfc_current_block ()->declared_at);
2533 gfc_error ("The type for function '%s' at %L is not accessible",
2534 gfc_current_block ()->name,
2535 &gfc_current_block ()->declared_at);
2537 gfc_current_block ()->ts.kind = 0;
2538 /* Keep the derived type; if it's bad, it will be discovered later. */
2539 if (!(ts->type == BT_DERIVED && ts->u.derived))
2540 ts->type = BT_UNKNOWN;
2547 /* Parse a WHERE block, (not a simple WHERE statement). */
2550 parse_where_block (void)
2552 int seen_empty_else;
2557 accept_statement (ST_WHERE_BLOCK);
2558 top = gfc_state_stack->tail;
2560 push_state (&s, COMP_WHERE, gfc_new_block);
2562 d = add_statement ();
2563 d->expr1 = top->expr1;
2569 seen_empty_else = 0;
2573 st = next_statement ();
2579 case ST_WHERE_BLOCK:
2580 parse_where_block ();
2585 accept_statement (st);
2589 if (seen_empty_else)
2591 gfc_error ("ELSEWHERE statement at %C follows previous "
2592 "unmasked ELSEWHERE");
2596 if (new_st.expr1 == NULL)
2597 seen_empty_else = 1;
2599 d = new_level (gfc_state_stack->head);
2601 d->expr1 = new_st.expr1;
2603 accept_statement (st);
2608 accept_statement (st);
2612 gfc_error ("Unexpected %s statement in WHERE block at %C",
2613 gfc_ascii_statement (st));
2614 reject_statement ();
2618 while (st != ST_END_WHERE);
2624 /* Parse a FORALL block (not a simple FORALL statement). */
2627 parse_forall_block (void)
2633 accept_statement (ST_FORALL_BLOCK);
2634 top = gfc_state_stack->tail;
2636 push_state (&s, COMP_FORALL, gfc_new_block);
2638 d = add_statement ();
2639 d->op = EXEC_FORALL;
2644 st = next_statement ();
2649 case ST_POINTER_ASSIGNMENT:
2652 accept_statement (st);
2655 case ST_WHERE_BLOCK:
2656 parse_where_block ();
2659 case ST_FORALL_BLOCK:
2660 parse_forall_block ();
2664 accept_statement (st);
2671 gfc_error ("Unexpected %s statement in FORALL block at %C",
2672 gfc_ascii_statement (st));
2674 reject_statement ();
2678 while (st != ST_END_FORALL);
2684 static gfc_statement parse_executable (gfc_statement);
2686 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2689 parse_if_block (void)
2698 accept_statement (ST_IF_BLOCK);
2700 top = gfc_state_stack->tail;
2701 push_state (&s, COMP_IF, gfc_new_block);
2703 new_st.op = EXEC_IF;
2704 d = add_statement ();
2706 d->expr1 = top->expr1;
2712 st = parse_executable (ST_NONE);
2722 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2723 "statement at %L", &else_locus);
2725 reject_statement ();
2729 d = new_level (gfc_state_stack->head);
2731 d->expr1 = new_st.expr1;
2733 accept_statement (st);
2740 gfc_error ("Duplicate ELSE statements at %L and %C",
2742 reject_statement ();
2747 else_locus = gfc_current_locus;
2749 d = new_level (gfc_state_stack->head);
2752 accept_statement (st);
2760 unexpected_statement (st);
2764 while (st != ST_ENDIF);
2767 accept_statement (st);
2771 /* Parse a SELECT block. */
2774 parse_select_block (void)
2780 accept_statement (ST_SELECT_CASE);
2782 cp = gfc_state_stack->tail;
2783 push_state (&s, COMP_SELECT, gfc_new_block);
2785 /* Make sure that the next statement is a CASE or END SELECT. */
2788 st = next_statement ();
2791 if (st == ST_END_SELECT)
2793 /* Empty SELECT CASE is OK. */
2794 accept_statement (st);
2801 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2804 reject_statement ();
2807 /* At this point, we're got a nonempty select block. */
2808 cp = new_level (cp);
2811 accept_statement (st);
2815 st = parse_executable (ST_NONE);
2822 cp = new_level (gfc_state_stack->head);
2824 gfc_clear_new_st ();
2826 accept_statement (st);
2832 /* Can't have an executable statement because of
2833 parse_executable(). */
2835 unexpected_statement (st);
2839 while (st != ST_END_SELECT);
2842 accept_statement (st);
2846 /* Given a symbol, make sure it is not an iteration variable for a DO
2847 statement. This subroutine is called when the symbol is seen in a
2848 context that causes it to become redefined. If the symbol is an
2849 iterator, we generate an error message and return nonzero. */
2852 gfc_check_do_variable (gfc_symtree *st)
2856 for (s=gfc_state_stack; s; s = s->previous)
2857 if (s->do_variable == st)
2859 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2860 "loop beginning at %L", st->name, &s->head->loc);
2868 /* Checks to see if the current statement label closes an enddo.
2869 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2870 an error) if it incorrectly closes an ENDDO. */
2873 check_do_closure (void)
2877 if (gfc_statement_label == NULL)
2880 for (p = gfc_state_stack; p; p = p->previous)
2881 if (p->state == COMP_DO)
2885 return 0; /* No loops to close */
2887 if (p->ext.end_do_label == gfc_statement_label)
2889 if (p == gfc_state_stack)
2892 gfc_error ("End of nonblock DO statement at %C is within another block");
2896 /* At this point, the label doesn't terminate the innermost loop.
2897 Make sure it doesn't terminate another one. */
2898 for (; p; p = p->previous)
2899 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2901 gfc_error ("End of nonblock DO statement at %C is interwoven "
2902 "with another DO loop");
2910 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2911 handled inside of parse_executable(), because they aren't really
2915 parse_do_block (void)
2922 s.ext.end_do_label = new_st.label1;
2924 if (new_st.ext.iterator != NULL)
2925 stree = new_st.ext.iterator->var->symtree;
2929 accept_statement (ST_DO);
2931 top = gfc_state_stack->tail;
2932 push_state (&s, COMP_DO, gfc_new_block);
2934 s.do_variable = stree;
2936 top->block = new_level (top);
2937 top->block->op = EXEC_DO;
2940 st = parse_executable (ST_NONE);
2948 if (s.ext.end_do_label != NULL
2949 && s.ext.end_do_label != gfc_statement_label)
2950 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2953 if (gfc_statement_label != NULL)
2955 new_st.op = EXEC_NOP;
2960 case ST_IMPLIED_ENDDO:
2961 /* If the do-stmt of this DO construct has a do-construct-name,
2962 the corresponding end-do must be an end-do-stmt (with a matching
2963 name, but in that case we must have seen ST_ENDDO first).
2964 We only complain about this in pedantic mode. */
2965 if (gfc_current_block () != NULL)
2966 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2967 &gfc_current_block()->declared_at);
2972 unexpected_statement (st);
2977 accept_statement (st);
2981 /* Parse the statements of OpenMP do/parallel do. */
2983 static gfc_statement
2984 parse_omp_do (gfc_statement omp_st)
2990 accept_statement (omp_st);
2992 cp = gfc_state_stack->tail;
2993 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2994 np = new_level (cp);
3000 st = next_statement ();
3003 else if (st == ST_DO)
3006 unexpected_statement (st);
3010 if (gfc_statement_label != NULL
3011 && gfc_state_stack->previous != NULL
3012 && gfc_state_stack->previous->state == COMP_DO
3013 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3021 there should be no !$OMP END DO. */
3023 return ST_IMPLIED_ENDDO;
3026 check_do_closure ();
3029 st = next_statement ();
3030 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3032 if (new_st.op == EXEC_OMP_END_NOWAIT)
3033 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3035 gcc_assert (new_st.op == EXEC_NOP);
3036 gfc_clear_new_st ();
3037 gfc_commit_symbols ();
3038 gfc_warning_check ();
3039 st = next_statement ();
3045 /* Parse the statements of OpenMP atomic directive. */
3048 parse_omp_atomic (void)
3054 accept_statement (ST_OMP_ATOMIC);
3056 cp = gfc_state_stack->tail;
3057 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3058 np = new_level (cp);
3064 st = next_statement ();
3067 else if (st == ST_ASSIGNMENT)
3070 unexpected_statement (st);
3073 accept_statement (st);
3079 /* Parse the statements of an OpenMP structured block. */
3082 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3084 gfc_statement st, omp_end_st;
3088 accept_statement (omp_st);
3090 cp = gfc_state_stack->tail;
3091 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3092 np = new_level (cp);
3098 case ST_OMP_PARALLEL:
3099 omp_end_st = ST_OMP_END_PARALLEL;
3101 case ST_OMP_PARALLEL_SECTIONS:
3102 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3104 case ST_OMP_SECTIONS:
3105 omp_end_st = ST_OMP_END_SECTIONS;
3107 case ST_OMP_ORDERED:
3108 omp_end_st = ST_OMP_END_ORDERED;
3110 case ST_OMP_CRITICAL:
3111 omp_end_st = ST_OMP_END_CRITICAL;
3114 omp_end_st = ST_OMP_END_MASTER;
3117 omp_end_st = ST_OMP_END_SINGLE;
3120 omp_end_st = ST_OMP_END_TASK;
3122 case ST_OMP_WORKSHARE:
3123 omp_end_st = ST_OMP_END_WORKSHARE;
3125 case ST_OMP_PARALLEL_WORKSHARE:
3126 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3134 if (workshare_stmts_only)
3136 /* Inside of !$omp workshare, only
3139 where statements and constructs
3140 forall statements and constructs
3144 are allowed. For !$omp critical these
3145 restrictions apply recursively. */
3148 st = next_statement ();
3159 accept_statement (st);
3162 case ST_WHERE_BLOCK:
3163 parse_where_block ();
3166 case ST_FORALL_BLOCK:
3167 parse_forall_block ();
3170 case ST_OMP_PARALLEL:
3171 case ST_OMP_PARALLEL_SECTIONS:
3172 parse_omp_structured_block (st, false);
3175 case ST_OMP_PARALLEL_WORKSHARE:
3176 case ST_OMP_CRITICAL:
3177 parse_omp_structured_block (st, true);
3180 case ST_OMP_PARALLEL_DO:
3181 st = parse_omp_do (st);
3185 parse_omp_atomic ();
3196 st = next_statement ();
3200 st = parse_executable (ST_NONE);
3203 else if (st == ST_OMP_SECTION
3204 && (omp_st == ST_OMP_SECTIONS
3205 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3207 np = new_level (np);
3211 else if (st != omp_end_st)
3212 unexpected_statement (st);
3214 while (st != omp_end_st);
3218 case EXEC_OMP_END_NOWAIT:
3219 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3221 case EXEC_OMP_CRITICAL:
3222 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3223 || (new_st.ext.omp_name != NULL
3224 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3225 gfc_error ("Name after !$omp critical and !$omp end critical does "
3227 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3229 case EXEC_OMP_END_SINGLE:
3230 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3231 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3232 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3233 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3241 gfc_clear_new_st ();
3242 gfc_commit_symbols ();
3243 gfc_warning_check ();
3248 /* Accept a series of executable statements. We return the first
3249 statement that doesn't fit to the caller. Any block statements are
3250 passed on to the correct handler, which usually passes the buck
3253 static gfc_statement
3254 parse_executable (gfc_statement st)
3259 st = next_statement ();
3263 close_flag = check_do_closure ();
3268 case ST_END_PROGRAM:
3271 case ST_END_FUNCTION:
3275 case ST_END_SUBROUTINE:
3280 case ST_SELECT_CASE:
3281 gfc_error ("%s statement at %C cannot terminate a non-block "
3282 "DO loop", gfc_ascii_statement (st));
3298 accept_statement (st);
3299 if (close_flag == 1)
3300 return ST_IMPLIED_ENDDO;
3307 case ST_SELECT_CASE:
3308 parse_select_block ();
3313 if (check_do_closure () == 1)
3314 return ST_IMPLIED_ENDDO;
3317 case ST_WHERE_BLOCK:
3318 parse_where_block ();
3321 case ST_FORALL_BLOCK:
3322 parse_forall_block ();
3325 case ST_OMP_PARALLEL:
3326 case ST_OMP_PARALLEL_SECTIONS:
3327 case ST_OMP_SECTIONS:
3328 case ST_OMP_ORDERED:
3329 case ST_OMP_CRITICAL:
3333 parse_omp_structured_block (st, false);
3336 case ST_OMP_WORKSHARE:
3337 case ST_OMP_PARALLEL_WORKSHARE:
3338 parse_omp_structured_block (st, true);
3342 case ST_OMP_PARALLEL_DO:
3343 st = parse_omp_do (st);
3344 if (st == ST_IMPLIED_ENDDO)
3349 parse_omp_atomic ();
3356 st = next_statement ();
3361 /* Parse a series of contained program units. */
3363 static void parse_progunit (gfc_statement);
3366 /* Fix the symbols for sibling functions. These are incorrectly added to
3367 the child namespace as the parser didn't know about this procedure. */
3370 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3374 gfc_symbol *old_sym;
3376 sym->attr.referenced = 1;
3377 for (ns = siblings; ns; ns = ns->sibling)
3379 st = gfc_find_symtree (ns->sym_root, sym->name);
3381 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3382 goto fixup_contained;
3384 old_sym = st->n.sym;
3385 if (old_sym->ns == ns
3386 && !old_sym->attr.contained
3388 /* By 14.6.1.3, host association should be excluded
3389 for the following. */
3390 && !(old_sym->attr.external
3391 || (old_sym->ts.type != BT_UNKNOWN
3392 && !old_sym->attr.implicit_type)
3393 || old_sym->attr.flavor == FL_PARAMETER
3394 || old_sym->attr.in_common
3395 || old_sym->attr.in_equivalence
3396 || old_sym->attr.data
3397 || old_sym->attr.dummy
3398 || old_sym->attr.result
3399 || old_sym->attr.dimension
3400 || old_sym->attr.allocatable
3401 || old_sym->attr.intrinsic
3402 || old_sym->attr.generic
3403 || old_sym->attr.flavor == FL_NAMELIST
3404 || old_sym->attr.proc == PROC_ST_FUNCTION))
3406 /* Replace it with the symbol from the parent namespace. */
3410 /* Free the old (local) symbol. */
3412 if (old_sym->refs == 0)
3413 gfc_free_symbol (old_sym);
3417 /* Do the same for any contained procedures. */
3418 gfc_fixup_sibling_symbols (sym, ns->contained);
3423 parse_contained (int module)
3425 gfc_namespace *ns, *parent_ns, *tmp;
3426 gfc_state_data s1, s2;
3430 int contains_statements = 0;
3433 push_state (&s1, COMP_CONTAINS, NULL);
3434 parent_ns = gfc_current_ns;
3438 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3440 gfc_current_ns->sibling = parent_ns->contained;
3441 parent_ns->contained = gfc_current_ns;
3444 /* Process the next available statement. We come here if we got an error
3445 and rejected the last statement. */
3446 st = next_statement ();
3455 contains_statements = 1;
3456 accept_statement (st);
3459 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3462 /* For internal procedures, create/update the symbol in the
3463 parent namespace. */
3467 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3468 gfc_error ("Contained procedure '%s' at %C is already "
3469 "ambiguous", gfc_new_block->name);
3472 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3473 &gfc_new_block->declared_at) ==
3476 if (st == ST_FUNCTION)
3477 gfc_add_function (&sym->attr, sym->name,
3478 &gfc_new_block->declared_at);
3480 gfc_add_subroutine (&sym->attr, sym->name,
3481 &gfc_new_block->declared_at);
3485 gfc_commit_symbols ();
3488 sym = gfc_new_block;
3490 /* Mark this as a contained function, so it isn't replaced
3491 by other module functions. */
3492 sym->attr.contained = 1;
3493 sym->attr.referenced = 1;
3495 parse_progunit (ST_NONE);
3497 /* Fix up any sibling functions that refer to this one. */
3498 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3499 /* Or refer to any of its alternate entry points. */
3500 for (el = gfc_current_ns->entries; el; el = el->next)
3501 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3503 gfc_current_ns->code = s2.head;
3504 gfc_current_ns = parent_ns;
3509 /* These statements are associated with the end of the host unit. */
3510 case ST_END_FUNCTION:
3512 case ST_END_PROGRAM:
3513 case ST_END_SUBROUTINE:
3514 accept_statement (st);
3518 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3519 gfc_ascii_statement (st));
3520 reject_statement ();
3526 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3527 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3529 /* The first namespace in the list is guaranteed to not have
3530 anything (worthwhile) in it. */
3531 tmp = gfc_current_ns;
3532 gfc_current_ns = parent_ns;
3533 if (seen_error && tmp->refs > 1)
3534 gfc_free_namespace (tmp);
3536 ns = gfc_current_ns->contained;
3537 gfc_current_ns->contained = ns->sibling;
3538 gfc_free_namespace (ns);
3541 if (!contains_statements)
3542 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3543 "FUNCTION or SUBROUTINE statement at %C");
3547 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3550 parse_progunit (gfc_statement st)
3555 st = parse_spec (st);
3565 accept_statement (st);
3572 if (gfc_current_state () == COMP_FUNCTION)
3573 gfc_check_function_type (gfc_current_ns);
3578 st = parse_executable (st);
3589 accept_statement (st);
3596 unexpected_statement (st);
3597 reject_statement ();
3598 st = next_statement ();
3604 for (p = gfc_state_stack; p; p = p->previous)
3605 if (p->state == COMP_CONTAINS)
3608 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3613 gfc_error ("CONTAINS statement at %C is already in a contained "
3615 st = next_statement ();
3619 parse_contained (0);
3622 gfc_current_ns->code = gfc_state_stack->head;
3626 /* Come here to complain about a global symbol already in use as
3630 gfc_global_used (gfc_gsymbol *sym, locus *where)
3635 where = &gfc_current_locus;
3645 case GSYM_SUBROUTINE:
3646 name = "SUBROUTINE";
3651 case GSYM_BLOCK_DATA:
3652 name = "BLOCK DATA";
3658 gfc_internal_error ("gfc_global_used(): Bad type");
3662 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3663 sym->name, where, name, &sym->where);
3667 /* Parse a block data program unit. */
3670 parse_block_data (void)
3673 static locus blank_locus;
3674 static int blank_block=0;
3677 gfc_current_ns->proc_name = gfc_new_block;
3678 gfc_current_ns->is_block_data = 1;
3680 if (gfc_new_block == NULL)
3683 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3684 "prior BLOCK DATA at %L", &blank_locus);
3688 blank_locus = gfc_current_locus;
3693 s = gfc_get_gsymbol (gfc_new_block->name);
3695 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3696 gfc_global_used(s, NULL);
3699 s->type = GSYM_BLOCK_DATA;
3700 s->where = gfc_current_locus;
3705 st = parse_spec (ST_NONE);
3707 while (st != ST_END_BLOCK_DATA)
3709 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3710 gfc_ascii_statement (st));
3711 reject_statement ();
3712 st = next_statement ();
3717 /* Parse a module subprogram. */
3725 s = gfc_get_gsymbol (gfc_new_block->name);
3726 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3727 gfc_global_used(s, NULL);
3730 s->type = GSYM_MODULE;
3731 s->where = gfc_current_locus;
3735 st = parse_spec (ST_NONE);
3744 parse_contained (1);
3748 accept_statement (st);
3752 gfc_error ("Unexpected %s statement in MODULE at %C",
3753 gfc_ascii_statement (st));
3755 reject_statement ();
3756 st = next_statement ();
3760 s->ns = gfc_current_ns;
3764 /* Add a procedure name to the global symbol table. */
3767 add_global_procedure (int sub)
3771 s = gfc_get_gsymbol(gfc_new_block->name);
3774 || (s->type != GSYM_UNKNOWN
3775 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3776 gfc_global_used(s, NULL);
3779 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3780 s->where = gfc_current_locus;
3782 s->ns = gfc_current_ns;
3787 /* Add a program to the global symbol table. */
3790 add_global_program (void)
3794 if (gfc_new_block == NULL)
3796 s = gfc_get_gsymbol (gfc_new_block->name);
3798 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3799 gfc_global_used(s, NULL);
3802 s->type = GSYM_PROGRAM;
3803 s->where = gfc_current_locus;
3805 s->ns = gfc_current_ns;
3810 /* Resolve all the program units when whole file scope option
3813 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
3815 gfc_free_dt_list ();
3816 gfc_current_ns = gfc_global_ns_list;
3817 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3819 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3820 gfc_resolve (gfc_current_ns);
3821 gfc_current_ns->derived_types = gfc_derived_types;
3822 gfc_derived_types = NULL;
3828 clean_up_modules (gfc_gsymbol *gsym)
3833 clean_up_modules (gsym->left);
3834 clean_up_modules (gsym->right);
3836 if (gsym->type != GSYM_MODULE || !gsym->ns)
3839 gfc_current_ns = gsym->ns;
3840 gfc_derived_types = gfc_current_ns->derived_types;
3847 /* Translate all the program units when whole file scope option
3848 is active. This could be in a different order to resolution if
3849 there are forward references in the file. */
3851 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
3855 gfc_current_ns = gfc_global_ns_list;
3856 gfc_get_errors (NULL, &errors);
3858 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3860 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3861 gfc_derived_types = gfc_current_ns->derived_types;
3862 gfc_generate_code (gfc_current_ns);
3863 gfc_current_ns->translated = 1;
3866 /* Clean up all the namespaces after translation. */
3867 gfc_current_ns = gfc_global_ns_list;
3868 for (;gfc_current_ns;)
3870 gfc_namespace *ns = gfc_current_ns->sibling;
3871 gfc_derived_types = gfc_current_ns->derived_types;
3873 gfc_current_ns = ns;
3876 clean_up_modules (gfc_gsym_root);
3880 /* Top level parser. */
3883 gfc_parse_file (void)
3885 int seen_program, errors_before, errors;
3886 gfc_state_data top, s;
3889 gfc_namespace *next;
3891 gfc_start_source_files ();
3893 top.state = COMP_NONE;
3895 top.previous = NULL;
3896 top.head = top.tail = NULL;
3897 top.do_variable = NULL;
3899 gfc_state_stack = ⊤
3901 gfc_clear_new_st ();
3903 gfc_statement_label = NULL;
3905 if (setjmp (eof_buf))
3906 return FAILURE; /* Come here on unexpected EOF */
3908 /* Prepare the global namespace that will contain the
3910 gfc_global_ns_list = next = NULL;
3914 /* Exit early for empty files. */
3920 st = next_statement ();
3929 goto duplicate_main;
3931 prog_locus = gfc_current_locus;
3933 push_state (&s, COMP_PROGRAM, gfc_new_block);
3934 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3935 accept_statement (st);
3936 add_global_program ();
3937 parse_progunit (ST_NONE);
3938 if (gfc_option.flag_whole_file)
3943 add_global_procedure (1);
3944 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3945 accept_statement (st);
3946 parse_progunit (ST_NONE);
3947 if (gfc_option.flag_whole_file)
3952 add_global_procedure (0);
3953 push_state (&s, COMP_FUNCTION, gfc_new_block);
3954 accept_statement (st);
3955 parse_progunit (ST_NONE);
3956 if (gfc_option.flag_whole_file)
3961 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3962 accept_statement (st);
3963 parse_block_data ();
3967 push_state (&s, COMP_MODULE, gfc_new_block);
3968 accept_statement (st);
3970 gfc_get_errors (NULL, &errors_before);
3974 /* Anything else starts a nameless main program block. */
3977 goto duplicate_main;
3979 prog_locus = gfc_current_locus;
3981 push_state (&s, COMP_PROGRAM, gfc_new_block);
3982 main_program_symbol (gfc_current_ns, "MAIN__");
3983 parse_progunit (st);
3984 if (gfc_option.flag_whole_file)
3989 /* Handle the non-program units. */
3990 gfc_current_ns->code = s.head;
3992 gfc_resolve (gfc_current_ns);
3994 /* Dump the parse tree if requested. */
3995 if (gfc_option.dump_parse_tree)
3996 gfc_dump_parse_tree (gfc_current_ns, stdout);
3998 gfc_get_errors (NULL, &errors);
3999 if (s.state == COMP_MODULE)
4001 gfc_dump_module (s.sym->name, errors_before == errors);
4003 gfc_generate_module_code (gfc_current_ns);
4005 if (!gfc_option.flag_whole_file)
4009 gfc_current_ns->derived_types = gfc_derived_types;
4010 gfc_derived_types = NULL;
4011 gfc_current_ns = NULL;
4017 gfc_generate_code (gfc_current_ns);
4025 /* The main program and non-contained procedures are put
4026 in the global namespace list, so that they can be processed
4027 later and all their interfaces resolved. */
4028 gfc_current_ns->code = s.head;
4030 next->sibling = gfc_current_ns;
4032 gfc_global_ns_list = gfc_current_ns;
4034 next = gfc_current_ns;
4041 if (!gfc_option.flag_whole_file)
4044 /* Do the resolution. */
4045 resolve_all_program_units (gfc_global_ns_list);
4047 /* Do the parse tree dump. */
4049 = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
4051 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4053 gfc_dump_parse_tree (gfc_current_ns, stdout);
4054 fputs ("------------------------------------------\n\n", stdout);
4057 /* Do the translation. */
4058 translate_all_program_units (gfc_global_ns_list);
4062 gfc_end_source_files ();
4066 /* If we see a duplicate main program, shut down. If the second
4067 instance is an implied main program, i.e. data decls or executable
4068 statements, we're in for lots of errors. */
4069 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4070 reject_statement ();