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 workshare", gfc_match_omp_end_nowait,
519 ST_OMP_END_WORKSHARE);
522 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
525 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
528 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
531 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
532 match ("parallel sections", gfc_match_omp_parallel_sections,
533 ST_OMP_PARALLEL_SECTIONS);
534 match ("parallel workshare", gfc_match_omp_parallel_workshare,
535 ST_OMP_PARALLEL_WORKSHARE);
536 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
539 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
540 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
541 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
544 match ("threadprivate", gfc_match_omp_threadprivate,
545 ST_OMP_THREADPRIVATE);
547 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
551 /* All else has failed, so give up. See if any of the matchers has
552 stored an error message of some sort. */
554 if (gfc_error_check () == 0)
555 gfc_error_now ("Unclassifiable OpenMP directive at %C");
559 gfc_error_recovery ();
567 /* Get the next statement in free form source. */
576 at_bol = gfc_at_bol ();
577 gfc_gobble_whitespace ();
579 c = gfc_peek_ascii_char ();
585 /* Found a statement label? */
586 m = gfc_match_st_label (&gfc_statement_label);
588 d = gfc_peek_ascii_char ();
589 if (m != MATCH_YES || !gfc_is_whitespace (d))
591 gfc_match_small_literal_int (&i, &cnt);
594 gfc_error_now ("Too many digits in statement label at %C");
597 gfc_error_now ("Zero is not a valid statement label at %C");
600 c = gfc_next_ascii_char ();
603 if (!gfc_is_whitespace (c))
604 gfc_error_now ("Non-numeric character in statement label at %C");
610 label_locus = gfc_current_locus;
612 gfc_gobble_whitespace ();
614 if (at_bol && gfc_peek_ascii_char () == ';')
616 gfc_error_now ("Semicolon at %C needs to be preceded by "
618 gfc_next_ascii_char (); /* Eat up the semicolon. */
622 if (gfc_match_eos () == MATCH_YES)
624 gfc_warning_now ("Ignoring statement label in empty statement "
626 gfc_free_st_label (gfc_statement_label);
627 gfc_statement_label = NULL;
634 /* Comments have already been skipped by the time we get here,
635 except for OpenMP directives. */
636 if (gfc_option.flag_openmp)
640 c = gfc_next_ascii_char ();
641 for (i = 0; i < 5; i++, c = gfc_next_ascii_char ())
642 gcc_assert (c == "!$omp"[i]);
644 gcc_assert (c == ' ');
645 gfc_gobble_whitespace ();
646 return decode_omp_directive ();
650 if (at_bol && c == ';')
652 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
653 gfc_next_ascii_char (); /* Eat up the semicolon. */
657 return decode_statement ();
661 /* Get the next statement in fixed-form source. */
666 int label, digit_flag, i;
671 return decode_statement ();
673 /* Skip past the current label field, parsing a statement label if
674 one is there. This is a weird number parser, since the number is
675 contained within five columns and can have any kind of embedded
676 spaces. We also check for characters that make the rest of the
682 for (i = 0; i < 5; i++)
684 c = gfc_next_char_literal (0);
701 label = label * 10 + ((unsigned char) c - '0');
702 label_locus = gfc_current_locus;
706 /* Comments have already been skipped by the time we get
707 here, except for OpenMP directives. */
709 if (gfc_option.flag_openmp)
711 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
712 gcc_assert ((char) gfc_wide_tolower (c) == "*$omp"[i]);
714 if (c != ' ' && c != '0')
716 gfc_buffer_error (0);
717 gfc_error ("Bad continuation line at %C");
721 return decode_omp_directive ();
725 /* Comments have already been skipped by the time we get
726 here so don't bother checking for them. */
729 gfc_buffer_error (0);
730 gfc_error ("Non-numeric character in statement label at %C");
738 gfc_warning_now ("Zero is not a valid statement label at %C");
741 /* We've found a valid statement label. */
742 gfc_statement_label = gfc_get_st_label (label);
746 /* Since this line starts a statement, it cannot be a continuation
747 of a previous statement. If we see something here besides a
748 space or zero, it must be a bad continuation line. */
750 c = gfc_next_char_literal (0);
754 if (c != ' ' && c != '0')
756 gfc_buffer_error (0);
757 gfc_error ("Bad continuation line at %C");
761 /* Now that we've taken care of the statement label columns, we have
762 to make sure that the first nonblank character is not a '!'. If
763 it is, the rest of the line is a comment. */
767 loc = gfc_current_locus;
768 c = gfc_next_char_literal (0);
770 while (gfc_is_whitespace (c));
774 gfc_current_locus = loc;
778 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
782 if (gfc_match_eos () == MATCH_YES)
785 /* At this point, we've got a nonblank statement to parse. */
786 return decode_statement ();
790 gfc_warning ("Ignoring statement label in empty statement at %C");
796 /* Return the next non-ST_NONE statement to the caller. We also worry
797 about including files and the ends of include files at this stage. */
800 next_statement (void)
804 gfc_new_block = NULL;
808 gfc_statement_label = NULL;
809 gfc_buffer_error (1);
813 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
814 && gfc_current_locus.lb
815 && gfc_current_locus.lb->truncated)
816 gfc_warning_now ("Line truncated at %C");
821 gfc_skip_comments ();
829 if (gfc_define_undef_line ())
832 old_locus = gfc_current_locus;
834 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
840 gfc_buffer_error (0);
842 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
844 gfc_free_st_label (gfc_statement_label);
845 gfc_statement_label = NULL;
846 gfc_current_locus = old_locus;
850 check_statement_label (st);
856 /****************************** Parser ***********************************/
858 /* The parser subroutines are of type 'try' that fail if the file ends
861 /* Macros that expand to case-labels for various classes of
862 statements. Start with executable statements that directly do
865 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
866 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
867 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
868 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
869 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
870 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
871 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
872 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
875 /* Statements that mark other executable statements. */
877 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
878 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
879 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
880 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
881 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
882 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE
884 /* Declaration statements */
886 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
887 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
888 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
891 /* Block end statements. Errors associated with interchanging these
892 are detected in gfc_match_end(). */
894 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
895 case ST_END_PROGRAM: case ST_END_SUBROUTINE
898 /* Push a new state onto the stack. */
901 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
903 p->state = new_state;
904 p->previous = gfc_state_stack;
906 p->head = p->tail = NULL;
907 p->do_variable = NULL;
912 /* Pop the current state. */
916 gfc_state_stack = gfc_state_stack->previous;
920 /* Try to find the given state in the state stack. */
923 gfc_find_state (gfc_compile_state state)
927 for (p = gfc_state_stack; p; p = p->previous)
928 if (p->state == state)
931 return (p == NULL) ? FAILURE : SUCCESS;
935 /* Starts a new level in the statement list. */
938 new_level (gfc_code *q)
942 p = q->block = gfc_get_code ();
944 gfc_state_stack->head = gfc_state_stack->tail = p;
950 /* Add the current new_st code structure and adds it to the current
951 program unit. As a side-effect, it zeroes the new_st. */
961 p->loc = gfc_current_locus;
963 if (gfc_state_stack->head == NULL)
964 gfc_state_stack->head = p;
966 gfc_state_stack->tail->next = p;
968 while (p->next != NULL)
971 gfc_state_stack->tail = p;
979 /* Frees everything associated with the current statement. */
982 undo_new_statement (void)
984 gfc_free_statements (new_st.block);
985 gfc_free_statements (new_st.next);
986 gfc_free_statement (&new_st);
991 /* If the current statement has a statement label, make sure that it
992 is allowed to, or should have one. */
995 check_statement_label (gfc_statement st)
999 if (gfc_statement_label == NULL)
1001 if (st == ST_FORMAT)
1002 gfc_error ("FORMAT statement at %L does not have a statement label",
1009 case ST_END_PROGRAM:
1010 case ST_END_FUNCTION:
1011 case ST_END_SUBROUTINE:
1017 type = ST_LABEL_TARGET;
1021 type = ST_LABEL_FORMAT;
1024 /* Statement labels are not restricted from appearing on a
1025 particular line. However, there are plenty of situations
1026 where the resulting label can't be referenced. */
1029 type = ST_LABEL_BAD_TARGET;
1033 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1035 new_st.here = gfc_statement_label;
1039 /* Figures out what the enclosing program unit is. This will be a
1040 function, subroutine, program, block data or module. */
1043 gfc_enclosing_unit (gfc_compile_state * result)
1047 for (p = gfc_state_stack; p; p = p->previous)
1048 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1049 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1050 || p->state == COMP_PROGRAM)
1059 *result = COMP_PROGRAM;
1064 /* Translate a statement enum to a string. */
1067 gfc_ascii_statement (gfc_statement st)
1073 case ST_ARITHMETIC_IF:
1074 p = _("arithmetic IF");
1080 p = _("attribute declaration");
1110 p = _("data declaration");
1118 case ST_DERIVED_DECL:
1119 p = _("derived type declaration");
1133 case ST_END_BLOCK_DATA:
1134 p = "END BLOCK DATA";
1145 case ST_END_FUNCTION:
1151 case ST_END_INTERFACE:
1152 p = "END INTERFACE";
1157 case ST_END_PROGRAM:
1163 case ST_END_SUBROUTINE:
1164 p = "END SUBROUTINE";
1175 case ST_EQUIVALENCE:
1184 case ST_FORALL_BLOCK: /* Fall through */
1203 case ST_IMPLICIT_NONE:
1204 p = "IMPLICIT NONE";
1206 case ST_IMPLIED_ENDDO:
1207 p = _("implied END DO");
1233 case ST_MODULE_PROC:
1234 p = "MODULE PROCEDURE";
1272 case ST_WHERE_BLOCK: /* Fall through */
1283 p = _("assignment");
1285 case ST_POINTER_ASSIGNMENT:
1286 p = _("pointer assignment");
1288 case ST_SELECT_CASE:
1297 case ST_STATEMENT_FUNCTION:
1298 p = "STATEMENT FUNCTION";
1300 case ST_LABEL_ASSIGNMENT:
1301 p = "LABEL ASSIGNMENT";
1304 p = "ENUM DEFINITION";
1307 p = "ENUMERATOR DEFINITION";
1315 case ST_OMP_BARRIER:
1316 p = "!$OMP BARRIER";
1318 case ST_OMP_CRITICAL:
1319 p = "!$OMP CRITICAL";
1324 case ST_OMP_END_CRITICAL:
1325 p = "!$OMP END CRITICAL";
1330 case ST_OMP_END_MASTER:
1331 p = "!$OMP END MASTER";
1333 case ST_OMP_END_ORDERED:
1334 p = "!$OMP END ORDERED";
1336 case ST_OMP_END_PARALLEL:
1337 p = "!$OMP END PARALLEL";
1339 case ST_OMP_END_PARALLEL_DO:
1340 p = "!$OMP END PARALLEL DO";
1342 case ST_OMP_END_PARALLEL_SECTIONS:
1343 p = "!$OMP END PARALLEL SECTIONS";
1345 case ST_OMP_END_PARALLEL_WORKSHARE:
1346 p = "!$OMP END PARALLEL WORKSHARE";
1348 case ST_OMP_END_SECTIONS:
1349 p = "!$OMP END SECTIONS";
1351 case ST_OMP_END_SINGLE:
1352 p = "!$OMP END SINGLE";
1354 case ST_OMP_END_WORKSHARE:
1355 p = "!$OMP END WORKSHARE";
1363 case ST_OMP_ORDERED:
1364 p = "!$OMP ORDERED";
1366 case ST_OMP_PARALLEL:
1367 p = "!$OMP PARALLEL";
1369 case ST_OMP_PARALLEL_DO:
1370 p = "!$OMP PARALLEL DO";
1372 case ST_OMP_PARALLEL_SECTIONS:
1373 p = "!$OMP PARALLEL SECTIONS";
1375 case ST_OMP_PARALLEL_WORKSHARE:
1376 p = "!$OMP PARALLEL WORKSHARE";
1378 case ST_OMP_SECTIONS:
1379 p = "!$OMP SECTIONS";
1381 case ST_OMP_SECTION:
1382 p = "!$OMP SECTION";
1387 case ST_OMP_THREADPRIVATE:
1388 p = "!$OMP THREADPRIVATE";
1390 case ST_OMP_WORKSHARE:
1391 p = "!$OMP WORKSHARE";
1394 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1401 /* Create a symbol for the main program and assign it to ns->proc_name. */
1404 main_program_symbol (gfc_namespace *ns, const char *name)
1406 gfc_symbol *main_program;
1407 symbol_attribute attr;
1409 gfc_get_symbol (name, ns, &main_program);
1410 gfc_clear_attr (&attr);
1411 attr.flavor = FL_PROGRAM;
1412 attr.proc = PROC_UNKNOWN;
1413 attr.subroutine = 1;
1414 attr.access = ACCESS_PUBLIC;
1415 attr.is_main_program = 1;
1416 main_program->attr = attr;
1417 main_program->declared_at = gfc_current_locus;
1418 ns->proc_name = main_program;
1419 gfc_commit_symbols ();
1423 /* Do whatever is necessary to accept the last statement. */
1426 accept_statement (gfc_statement st)
1434 case ST_IMPLICIT_NONE:
1435 gfc_set_implicit_none ();
1444 gfc_current_ns->proc_name = gfc_new_block;
1447 /* If the statement is the end of a block, lay down a special code
1448 that allows a branch to the end of the block from within the
1453 if (gfc_statement_label != NULL)
1455 new_st.op = EXEC_NOP;
1461 /* The end-of-program unit statements do not get the special
1462 marker and require a statement of some sort if they are a
1465 case ST_END_PROGRAM:
1466 case ST_END_FUNCTION:
1467 case ST_END_SUBROUTINE:
1468 if (gfc_statement_label != NULL)
1470 new_st.op = EXEC_RETURN;
1486 gfc_commit_symbols ();
1487 gfc_warning_check ();
1488 gfc_clear_new_st ();
1492 /* Undo anything tentative that has been built for the current
1496 reject_statement (void)
1498 gfc_new_block = NULL;
1499 gfc_undo_symbols ();
1500 gfc_clear_warning ();
1501 undo_new_statement ();
1505 /* Generic complaint about an out of order statement. We also do
1506 whatever is necessary to clean up. */
1509 unexpected_statement (gfc_statement st)
1511 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1513 reject_statement ();
1517 /* Given the next statement seen by the matcher, make sure that it is
1518 in proper order with the last. This subroutine is initialized by
1519 calling it with an argument of ST_NONE. If there is a problem, we
1520 issue an error and return FAILURE. Otherwise we return SUCCESS.
1522 Individual parsers need to verify that the statements seen are
1523 valid before calling here, ie ENTRY statements are not allowed in
1524 INTERFACE blocks. The following diagram is taken from the standard:
1526 +---------------------------------------+
1527 | program subroutine function module |
1528 +---------------------------------------+
1530 +---------------------------------------+
1532 +---------------------------------------+
1534 | +-----------+------------------+
1535 | | parameter | implicit |
1536 | +-----------+------------------+
1537 | format | | derived type |
1538 | entry | parameter | interface |
1539 | | data | specification |
1540 | | | statement func |
1541 | +-----------+------------------+
1542 | | data | executable |
1543 +--------+-----------+------------------+
1545 +---------------------------------------+
1546 | internal module/subprogram |
1547 +---------------------------------------+
1549 +---------------------------------------+
1556 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1557 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1560 gfc_statement last_statement;
1566 verify_st_order (st_state *p, gfc_statement st)
1572 p->state = ORDER_START;
1576 if (p->state > ORDER_USE)
1578 p->state = ORDER_USE;
1582 if (p->state > ORDER_IMPORT)
1584 p->state = ORDER_IMPORT;
1587 case ST_IMPLICIT_NONE:
1588 if (p->state > ORDER_IMPLICIT_NONE)
1591 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1592 statement disqualifies a USE but not an IMPLICIT NONE.
1593 Duplicate IMPLICIT NONEs are caught when the implicit types
1596 p->state = ORDER_IMPLICIT_NONE;
1600 if (p->state > ORDER_IMPLICIT)
1602 p->state = ORDER_IMPLICIT;
1607 if (p->state < ORDER_IMPLICIT_NONE)
1608 p->state = ORDER_IMPLICIT_NONE;
1612 if (p->state >= ORDER_EXEC)
1614 if (p->state < ORDER_IMPLICIT)
1615 p->state = ORDER_IMPLICIT;
1619 if (p->state < ORDER_SPEC)
1620 p->state = ORDER_SPEC;
1625 case ST_DERIVED_DECL:
1627 if (p->state >= ORDER_EXEC)
1629 if (p->state < ORDER_SPEC)
1630 p->state = ORDER_SPEC;
1635 if (p->state < ORDER_EXEC)
1636 p->state = ORDER_EXEC;
1640 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1641 gfc_ascii_statement (st));
1644 /* All is well, record the statement in case we need it next time. */
1645 p->where = gfc_current_locus;
1646 p->last_statement = st;
1650 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1651 gfc_ascii_statement (st),
1652 gfc_ascii_statement (p->last_statement), &p->where);
1658 /* Handle an unexpected end of file. This is a show-stopper... */
1660 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1663 unexpected_eof (void)
1667 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1669 /* Memory cleanup. Move to "second to last". */
1670 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1673 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1676 longjmp (eof_buf, 1);
1680 /* Parse a derived type. */
1683 parse_derived (void)
1685 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1686 int seen_contains, seen_contains_comp;
1689 gfc_symbol *derived_sym = NULL;
1695 accept_statement (ST_DERIVED_DECL);
1696 push_state (&s, COMP_DERIVED, gfc_new_block);
1698 gfc_new_block->component_access = ACCESS_PUBLIC;
1703 seen_contains_comp = 0;
1707 while (compiling_type)
1709 st = next_statement ();
1719 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1723 accept_statement (st);
1730 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1734 if (gfc_notify_std (GFC_STD_F2003,
1735 "Fortran 2003: FINAL procedure declaration"
1736 " at %C") == FAILURE)
1739 accept_statement (ST_FINAL);
1740 seen_contains_comp = 1;
1747 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1748 "definition at %C without components")
1752 if (seen_contains && !seen_contains_comp
1753 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1754 "definition at %C with empty CONTAINS "
1755 "section") == FAILURE))
1758 accept_statement (ST_END_TYPE);
1764 gfc_error ("PRIVATE statement at %C must precede CONTAINS");
1768 if (gfc_find_state (COMP_MODULE) == FAILURE)
1770 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1778 gfc_error ("PRIVATE statement at %C must precede "
1779 "structure components");
1786 gfc_error ("Duplicate PRIVATE statement at %C");
1790 s.sym->component_access = ACCESS_PRIVATE;
1791 accept_statement (ST_PRIVATE);
1798 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1804 gfc_error ("SEQUENCE statement at %C must precede "
1805 "structure components");
1810 if (gfc_current_block ()->attr.sequence)
1811 gfc_warning ("SEQUENCE attribute at %C already specified in "
1816 gfc_error ("Duplicate SEQUENCE statement at %C");
1821 gfc_add_sequence (&gfc_current_block ()->attr,
1822 gfc_current_block ()->name, NULL);
1826 if (gfc_notify_std (GFC_STD_F2003,
1827 "Fortran 2003: CONTAINS block in derived type"
1828 " definition at %C") == FAILURE)
1833 gfc_error ("Already inside a CONTAINS block at %C");
1838 accept_statement (ST_CONTAINS);
1842 unexpected_statement (st);
1847 /* need to verify that all fields of the derived type are
1848 * interoperable with C if the type is declared to be bind(c)
1850 derived_sym = gfc_current_block();
1852 sym = gfc_current_block ();
1853 for (c = sym->components; c; c = c->next)
1855 /* Look for allocatable components. */
1857 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.alloc_comp))
1859 sym->attr.alloc_comp = 1;
1863 /* Look for pointer components. */
1865 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.pointer_comp))
1867 sym->attr.pointer_comp = 1;
1871 /* Look for private components. */
1872 if (sym->component_access == ACCESS_PRIVATE
1873 || c->access == ACCESS_PRIVATE
1874 || (c->ts.type == BT_DERIVED && c->ts.derived->attr.private_comp))
1876 sym->attr.private_comp = 1;
1881 if (!seen_component)
1882 sym->attr.zero_comp = 1;
1888 /* Parse an ENUM. */
1897 int seen_enumerator = 0;
1901 push_state (&s, COMP_ENUM, gfc_new_block);
1905 while (compiling_enum)
1907 st = next_statement ();
1915 seen_enumerator = 1;
1916 accept_statement (st);
1921 if (!seen_enumerator)
1923 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
1926 accept_statement (st);
1930 gfc_free_enum_history ();
1931 unexpected_statement (st);
1939 /* Parse an interface. We must be able to deal with the possibility
1940 of recursive interfaces. The parse_spec() subroutine is mutually
1941 recursive with parse_interface(). */
1943 static gfc_statement parse_spec (gfc_statement);
1946 parse_interface (void)
1948 gfc_compile_state new_state, current_state;
1949 gfc_symbol *prog_unit, *sym;
1950 gfc_interface_info save;
1951 gfc_state_data s1, s2;
1955 accept_statement (ST_INTERFACE);
1957 current_interface.ns = gfc_current_ns;
1958 save = current_interface;
1960 sym = (current_interface.type == INTERFACE_GENERIC
1961 || current_interface.type == INTERFACE_USER_OP)
1962 ? gfc_new_block : NULL;
1964 push_state (&s1, COMP_INTERFACE, sym);
1965 current_state = COMP_NONE;
1968 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
1970 st = next_statement ();
1977 new_state = COMP_SUBROUTINE;
1978 gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
1979 gfc_new_block->formal, NULL);
1980 if (current_interface.type != INTERFACE_ABSTRACT &&
1981 !gfc_new_block->attr.dummy &&
1982 gfc_add_external (&gfc_new_block->attr, &gfc_current_locus) == FAILURE)
1984 reject_statement ();
1985 gfc_free_namespace (gfc_current_ns);
1991 new_state = COMP_FUNCTION;
1992 gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
1993 gfc_new_block->formal, NULL);
1994 if (current_interface.type != INTERFACE_ABSTRACT &&
1995 !gfc_new_block->attr.dummy &&
1996 gfc_add_external (&gfc_new_block->attr, &gfc_current_locus) == FAILURE)
1998 reject_statement ();
1999 gfc_free_namespace (gfc_current_ns);
2005 case ST_MODULE_PROC: /* The module procedure matcher makes
2006 sure the context is correct. */
2007 accept_statement (st);
2008 gfc_free_namespace (gfc_current_ns);
2011 case ST_END_INTERFACE:
2012 gfc_free_namespace (gfc_current_ns);
2013 gfc_current_ns = current_interface.ns;
2017 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2018 gfc_ascii_statement (st));
2019 reject_statement ();
2020 gfc_free_namespace (gfc_current_ns);
2025 /* Make sure that a generic interface has only subroutines or
2026 functions and that the generic name has the right attribute. */
2027 if (current_interface.type == INTERFACE_GENERIC)
2029 if (current_state == COMP_NONE)
2031 if (new_state == COMP_FUNCTION)
2032 gfc_add_function (&sym->attr, sym->name, NULL);
2033 else if (new_state == COMP_SUBROUTINE)
2034 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2036 current_state = new_state;
2040 if (new_state != current_state)
2042 if (new_state == COMP_SUBROUTINE)
2043 gfc_error ("SUBROUTINE at %C does not belong in a "
2044 "generic function interface");
2046 if (new_state == COMP_FUNCTION)
2047 gfc_error ("FUNCTION at %C does not belong in a "
2048 "generic subroutine interface");
2053 if (current_interface.type == INTERFACE_ABSTRACT)
2055 gfc_new_block->attr.abstract = 1;
2056 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2057 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2058 "cannot be the same as an intrinsic type",
2059 gfc_new_block->name);
2062 push_state (&s2, new_state, gfc_new_block);
2063 accept_statement (st);
2064 prog_unit = gfc_new_block;
2065 prog_unit->formal_ns = gfc_current_ns;
2066 proc_locus = gfc_current_locus;
2069 /* Read data declaration statements. */
2070 st = parse_spec (ST_NONE);
2072 /* Since the interface block does not permit an IMPLICIT statement,
2073 the default type for the function or the result must be taken
2074 from the formal namespace. */
2075 if (new_state == COMP_FUNCTION)
2077 if (prog_unit->result == prog_unit
2078 && prog_unit->ts.type == BT_UNKNOWN)
2079 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2080 else if (prog_unit->result != prog_unit
2081 && prog_unit->result->ts.type == BT_UNKNOWN)
2082 gfc_set_default_type (prog_unit->result, 1,
2083 prog_unit->formal_ns);
2086 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2088 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2089 gfc_ascii_statement (st));
2090 reject_statement ();
2094 current_interface = save;
2095 gfc_add_interface (prog_unit);
2098 if (current_interface.ns
2099 && current_interface.ns->proc_name
2100 && strcmp (current_interface.ns->proc_name->name,
2101 prog_unit->name) == 0)
2102 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2103 "enclosing procedure", prog_unit->name, &proc_locus);
2112 /* Associate function characteristics by going back to the function
2113 declaration and rematching the prefix. */
2116 match_deferred_characteristics (gfc_typespec * ts)
2119 match m = MATCH_ERROR;
2120 char name[GFC_MAX_SYMBOL_LEN + 1];
2122 loc = gfc_current_locus;
2124 gfc_current_locus = gfc_current_block ()->declared_at;
2127 gfc_buffer_error (1);
2128 m = gfc_match_prefix (ts);
2129 gfc_buffer_error (0);
2131 if (ts->type == BT_DERIVED)
2135 if (!ts->derived || !ts->derived->components)
2139 /* Only permit one go at the characteristic association. */
2143 /* Set the function locus correctly. If we have not found the
2144 function name, there is an error. */
2145 gfc_match ("function% %n", name);
2146 if (m == MATCH_YES && strcmp (name, gfc_current_block ()->name) == 0)
2148 gfc_current_block ()->declared_at = gfc_current_locus;
2149 gfc_commit_symbols ();
2154 gfc_current_locus =loc;
2159 /* Parse a set of specification statements. Returns the statement
2160 that doesn't fit. */
2162 static gfc_statement
2163 parse_spec (gfc_statement st)
2166 bool bad_characteristic = false;
2169 verify_st_order (&ss, ST_NONE);
2171 st = next_statement ();
2181 case ST_DATA: /* Not allowed in interfaces */
2182 if (gfc_current_state () == COMP_INTERFACE)
2189 case ST_IMPLICIT_NONE:
2194 case ST_DERIVED_DECL:
2196 if (verify_st_order (&ss, st) == FAILURE)
2198 reject_statement ();
2199 st = next_statement ();
2209 case ST_DERIVED_DECL:
2215 if (gfc_current_state () != COMP_MODULE)
2217 gfc_error ("%s statement must appear in a MODULE",
2218 gfc_ascii_statement (st));
2222 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2224 gfc_error ("%s statement at %C follows another accessibility "
2225 "specification", gfc_ascii_statement (st));
2229 gfc_current_ns->default_access = (st == ST_PUBLIC)
2230 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2234 case ST_STATEMENT_FUNCTION:
2235 if (gfc_current_state () == COMP_MODULE)
2237 unexpected_statement (st);
2245 accept_statement (st);
2246 st = next_statement ();
2250 accept_statement (st);
2252 st = next_statement ();
2255 case ST_GET_FCN_CHARACTERISTICS:
2256 /* This statement triggers the association of a function's result
2258 ts = &gfc_current_block ()->result->ts;
2259 if (match_deferred_characteristics (ts) != MATCH_YES)
2260 bad_characteristic = true;
2262 st = next_statement ();
2269 /* If match_deferred_characteristics failed, then there is an error. */
2270 if (bad_characteristic)
2272 ts = &gfc_current_block ()->result->ts;
2273 if (ts->type != BT_DERIVED)
2274 gfc_error ("Bad kind expression for function '%s' at %L",
2275 gfc_current_block ()->name,
2276 &gfc_current_block ()->declared_at);
2278 gfc_error ("The type for function '%s' at %L is not accessible",
2279 gfc_current_block ()->name,
2280 &gfc_current_block ()->declared_at);
2282 gfc_current_block ()->ts.kind = 0;
2283 /* Keep the derived type; if it's bad, it will be discovered later. */
2284 if (!(ts->type == BT_DERIVED && ts->derived))
2285 ts->type = BT_UNKNOWN;
2292 /* Parse a WHERE block, (not a simple WHERE statement). */
2295 parse_where_block (void)
2297 int seen_empty_else;
2302 accept_statement (ST_WHERE_BLOCK);
2303 top = gfc_state_stack->tail;
2305 push_state (&s, COMP_WHERE, gfc_new_block);
2307 d = add_statement ();
2308 d->expr = top->expr;
2314 seen_empty_else = 0;
2318 st = next_statement ();
2324 case ST_WHERE_BLOCK:
2325 parse_where_block ();
2330 accept_statement (st);
2334 if (seen_empty_else)
2336 gfc_error ("ELSEWHERE statement at %C follows previous "
2337 "unmasked ELSEWHERE");
2341 if (new_st.expr == NULL)
2342 seen_empty_else = 1;
2344 d = new_level (gfc_state_stack->head);
2346 d->expr = new_st.expr;
2348 accept_statement (st);
2353 accept_statement (st);
2357 gfc_error ("Unexpected %s statement in WHERE block at %C",
2358 gfc_ascii_statement (st));
2359 reject_statement ();
2363 while (st != ST_END_WHERE);
2369 /* Parse a FORALL block (not a simple FORALL statement). */
2372 parse_forall_block (void)
2378 accept_statement (ST_FORALL_BLOCK);
2379 top = gfc_state_stack->tail;
2381 push_state (&s, COMP_FORALL, gfc_new_block);
2383 d = add_statement ();
2384 d->op = EXEC_FORALL;
2389 st = next_statement ();
2394 case ST_POINTER_ASSIGNMENT:
2397 accept_statement (st);
2400 case ST_WHERE_BLOCK:
2401 parse_where_block ();
2404 case ST_FORALL_BLOCK:
2405 parse_forall_block ();
2409 accept_statement (st);
2416 gfc_error ("Unexpected %s statement in FORALL block at %C",
2417 gfc_ascii_statement (st));
2419 reject_statement ();
2423 while (st != ST_END_FORALL);
2429 static gfc_statement parse_executable (gfc_statement);
2431 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2434 parse_if_block (void)
2443 accept_statement (ST_IF_BLOCK);
2445 top = gfc_state_stack->tail;
2446 push_state (&s, COMP_IF, gfc_new_block);
2448 new_st.op = EXEC_IF;
2449 d = add_statement ();
2451 d->expr = top->expr;
2457 st = parse_executable (ST_NONE);
2467 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2468 "statement at %L", &else_locus);
2470 reject_statement ();
2474 d = new_level (gfc_state_stack->head);
2476 d->expr = new_st.expr;
2478 accept_statement (st);
2485 gfc_error ("Duplicate ELSE statements at %L and %C",
2487 reject_statement ();
2492 else_locus = gfc_current_locus;
2494 d = new_level (gfc_state_stack->head);
2497 accept_statement (st);
2505 unexpected_statement (st);
2509 while (st != ST_ENDIF);
2512 accept_statement (st);
2516 /* Parse a SELECT block. */
2519 parse_select_block (void)
2525 accept_statement (ST_SELECT_CASE);
2527 cp = gfc_state_stack->tail;
2528 push_state (&s, COMP_SELECT, gfc_new_block);
2530 /* Make sure that the next statement is a CASE or END SELECT. */
2533 st = next_statement ();
2536 if (st == ST_END_SELECT)
2538 /* Empty SELECT CASE is OK. */
2539 accept_statement (st);
2546 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2549 reject_statement ();
2552 /* At this point, we're got a nonempty select block. */
2553 cp = new_level (cp);
2556 accept_statement (st);
2560 st = parse_executable (ST_NONE);
2567 cp = new_level (gfc_state_stack->head);
2569 gfc_clear_new_st ();
2571 accept_statement (st);
2577 /* Can't have an executable statement because of
2578 parse_executable(). */
2580 unexpected_statement (st);
2584 while (st != ST_END_SELECT);
2587 accept_statement (st);
2591 /* Given a symbol, make sure it is not an iteration variable for a DO
2592 statement. This subroutine is called when the symbol is seen in a
2593 context that causes it to become redefined. If the symbol is an
2594 iterator, we generate an error message and return nonzero. */
2597 gfc_check_do_variable (gfc_symtree *st)
2601 for (s=gfc_state_stack; s; s = s->previous)
2602 if (s->do_variable == st)
2604 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2605 "loop beginning at %L", st->name, &s->head->loc);
2613 /* Checks to see if the current statement label closes an enddo.
2614 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2615 an error) if it incorrectly closes an ENDDO. */
2618 check_do_closure (void)
2622 if (gfc_statement_label == NULL)
2625 for (p = gfc_state_stack; p; p = p->previous)
2626 if (p->state == COMP_DO)
2630 return 0; /* No loops to close */
2632 if (p->ext.end_do_label == gfc_statement_label)
2635 if (p == gfc_state_stack)
2638 gfc_error ("End of nonblock DO statement at %C is within another block");
2642 /* At this point, the label doesn't terminate the innermost loop.
2643 Make sure it doesn't terminate another one. */
2644 for (; p; p = p->previous)
2645 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2647 gfc_error ("End of nonblock DO statement at %C is interwoven "
2648 "with another DO loop");
2656 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2657 handled inside of parse_executable(), because they aren't really
2661 parse_do_block (void)
2668 s.ext.end_do_label = new_st.label;
2670 if (new_st.ext.iterator != NULL)
2671 stree = new_st.ext.iterator->var->symtree;
2675 accept_statement (ST_DO);
2677 top = gfc_state_stack->tail;
2678 push_state (&s, COMP_DO, gfc_new_block);
2680 s.do_variable = stree;
2682 top->block = new_level (top);
2683 top->block->op = EXEC_DO;
2686 st = parse_executable (ST_NONE);
2694 if (s.ext.end_do_label != NULL
2695 && s.ext.end_do_label != gfc_statement_label)
2696 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2699 if (gfc_statement_label != NULL)
2701 new_st.op = EXEC_NOP;
2706 case ST_IMPLIED_ENDDO:
2707 /* If the do-stmt of this DO construct has a do-construct-name,
2708 the corresponding end-do must be an end-do-stmt (with a matching
2709 name, but in that case we must have seen ST_ENDDO first).
2710 We only complain about this in pedantic mode. */
2711 if (gfc_current_block () != NULL)
2712 gfc_error_now ("named block DO at %L requires matching ENDDO name",
2713 &gfc_current_block()->declared_at);
2718 unexpected_statement (st);
2723 accept_statement (st);
2727 /* Parse the statements of OpenMP do/parallel do. */
2729 static gfc_statement
2730 parse_omp_do (gfc_statement omp_st)
2736 accept_statement (omp_st);
2738 cp = gfc_state_stack->tail;
2739 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2740 np = new_level (cp);
2746 st = next_statement ();
2749 else if (st == ST_DO)
2752 unexpected_statement (st);
2756 if (gfc_statement_label != NULL
2757 && gfc_state_stack->previous != NULL
2758 && gfc_state_stack->previous->state == COMP_DO
2759 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2767 there should be no !$OMP END DO. */
2769 return ST_IMPLIED_ENDDO;
2772 check_do_closure ();
2775 st = next_statement ();
2776 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2778 if (new_st.op == EXEC_OMP_END_NOWAIT)
2779 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2781 gcc_assert (new_st.op == EXEC_NOP);
2782 gfc_clear_new_st ();
2783 gfc_commit_symbols ();
2784 gfc_warning_check ();
2785 st = next_statement ();
2791 /* Parse the statements of OpenMP atomic directive. */
2794 parse_omp_atomic (void)
2800 accept_statement (ST_OMP_ATOMIC);
2802 cp = gfc_state_stack->tail;
2803 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2804 np = new_level (cp);
2810 st = next_statement ();
2813 else if (st == ST_ASSIGNMENT)
2816 unexpected_statement (st);
2819 accept_statement (st);
2825 /* Parse the statements of an OpenMP structured block. */
2828 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
2830 gfc_statement st, omp_end_st;
2834 accept_statement (omp_st);
2836 cp = gfc_state_stack->tail;
2837 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2838 np = new_level (cp);
2844 case ST_OMP_PARALLEL:
2845 omp_end_st = ST_OMP_END_PARALLEL;
2847 case ST_OMP_PARALLEL_SECTIONS:
2848 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
2850 case ST_OMP_SECTIONS:
2851 omp_end_st = ST_OMP_END_SECTIONS;
2853 case ST_OMP_ORDERED:
2854 omp_end_st = ST_OMP_END_ORDERED;
2856 case ST_OMP_CRITICAL:
2857 omp_end_st = ST_OMP_END_CRITICAL;
2860 omp_end_st = ST_OMP_END_MASTER;
2863 omp_end_st = ST_OMP_END_SINGLE;
2865 case ST_OMP_WORKSHARE:
2866 omp_end_st = ST_OMP_END_WORKSHARE;
2868 case ST_OMP_PARALLEL_WORKSHARE:
2869 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
2877 if (workshare_stmts_only)
2879 /* Inside of !$omp workshare, only
2882 where statements and constructs
2883 forall statements and constructs
2887 are allowed. For !$omp critical these
2888 restrictions apply recursively. */
2891 st = next_statement ();
2902 accept_statement (st);
2905 case ST_WHERE_BLOCK:
2906 parse_where_block ();
2909 case ST_FORALL_BLOCK:
2910 parse_forall_block ();
2913 case ST_OMP_PARALLEL:
2914 case ST_OMP_PARALLEL_SECTIONS:
2915 parse_omp_structured_block (st, false);
2918 case ST_OMP_PARALLEL_WORKSHARE:
2919 case ST_OMP_CRITICAL:
2920 parse_omp_structured_block (st, true);
2923 case ST_OMP_PARALLEL_DO:
2924 st = parse_omp_do (st);
2928 parse_omp_atomic ();
2939 st = next_statement ();
2943 st = parse_executable (ST_NONE);
2946 else if (st == ST_OMP_SECTION
2947 && (omp_st == ST_OMP_SECTIONS
2948 || omp_st == ST_OMP_PARALLEL_SECTIONS))
2950 np = new_level (np);
2954 else if (st != omp_end_st)
2955 unexpected_statement (st);
2957 while (st != omp_end_st);
2961 case EXEC_OMP_END_NOWAIT:
2962 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2964 case EXEC_OMP_CRITICAL:
2965 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
2966 || (new_st.ext.omp_name != NULL
2967 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
2968 gfc_error ("Name after !$omp critical and !$omp end critical does "
2970 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
2972 case EXEC_OMP_END_SINGLE:
2973 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
2974 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
2975 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
2976 gfc_free_omp_clauses (new_st.ext.omp_clauses);
2984 gfc_clear_new_st ();
2985 gfc_commit_symbols ();
2986 gfc_warning_check ();
2991 /* Accept a series of executable statements. We return the first
2992 statement that doesn't fit to the caller. Any block statements are
2993 passed on to the correct handler, which usually passes the buck
2996 static gfc_statement
2997 parse_executable (gfc_statement st)
3002 st = next_statement ();
3006 close_flag = check_do_closure ();
3011 case ST_END_PROGRAM:
3014 case ST_END_FUNCTION:
3018 case ST_END_SUBROUTINE:
3023 case ST_SELECT_CASE:
3024 gfc_error ("%s statement at %C cannot terminate a non-block "
3025 "DO loop", gfc_ascii_statement (st));
3041 accept_statement (st);
3042 if (close_flag == 1)
3043 return ST_IMPLIED_ENDDO;
3050 case ST_SELECT_CASE:
3051 parse_select_block ();
3056 if (check_do_closure () == 1)
3057 return ST_IMPLIED_ENDDO;
3060 case ST_WHERE_BLOCK:
3061 parse_where_block ();
3064 case ST_FORALL_BLOCK:
3065 parse_forall_block ();
3068 case ST_OMP_PARALLEL:
3069 case ST_OMP_PARALLEL_SECTIONS:
3070 case ST_OMP_SECTIONS:
3071 case ST_OMP_ORDERED:
3072 case ST_OMP_CRITICAL:
3075 parse_omp_structured_block (st, false);
3078 case ST_OMP_WORKSHARE:
3079 case ST_OMP_PARALLEL_WORKSHARE:
3080 parse_omp_structured_block (st, true);
3084 case ST_OMP_PARALLEL_DO:
3085 st = parse_omp_do (st);
3086 if (st == ST_IMPLIED_ENDDO)
3091 parse_omp_atomic ();
3098 st = next_statement ();
3103 /* Parse a series of contained program units. */
3105 static void parse_progunit (gfc_statement);
3108 /* Fix the symbols for sibling functions. These are incorrectly added to
3109 the child namespace as the parser didn't know about this procedure. */
3112 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3116 gfc_symbol *old_sym;
3118 sym->attr.referenced = 1;
3119 for (ns = siblings; ns; ns = ns->sibling)
3121 gfc_find_sym_tree (sym->name, ns, 0, &st);
3123 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3126 old_sym = st->n.sym;
3127 if (old_sym->ns == ns
3128 && !old_sym->attr.contained
3130 /* By 14.6.1.3, host association should be excluded
3131 for the following. */
3132 && !(old_sym->attr.external
3133 || (old_sym->ts.type != BT_UNKNOWN
3134 && !old_sym->attr.implicit_type)
3135 || old_sym->attr.flavor == FL_PARAMETER
3136 || old_sym->attr.in_common
3137 || old_sym->attr.in_equivalence
3138 || old_sym->attr.data
3139 || old_sym->attr.dummy
3140 || old_sym->attr.result
3141 || old_sym->attr.dimension
3142 || old_sym->attr.allocatable
3143 || old_sym->attr.intrinsic
3144 || old_sym->attr.generic
3145 || old_sym->attr.flavor == FL_NAMELIST
3146 || old_sym->attr.proc == PROC_ST_FUNCTION))
3148 /* Replace it with the symbol from the parent namespace. */
3152 /* Free the old (local) symbol. */
3154 if (old_sym->refs == 0)
3155 gfc_free_symbol (old_sym);
3158 /* Do the same for any contained procedures. */
3159 gfc_fixup_sibling_symbols (sym, ns->contained);
3164 parse_contained (int module)
3166 gfc_namespace *ns, *parent_ns, *tmp;
3167 gfc_state_data s1, s2;
3171 int contains_statements = 0;
3174 push_state (&s1, COMP_CONTAINS, NULL);
3175 parent_ns = gfc_current_ns;
3179 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3181 gfc_current_ns->sibling = parent_ns->contained;
3182 parent_ns->contained = gfc_current_ns;
3185 /* Process the next available statement. We come here if we got an error
3186 and rejected the last statement. */
3187 st = next_statement ();
3196 contains_statements = 1;
3197 accept_statement (st);
3200 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3203 /* For internal procedures, create/update the symbol in the
3204 parent namespace. */
3208 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3209 gfc_error ("Contained procedure '%s' at %C is already "
3210 "ambiguous", gfc_new_block->name);
3213 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3214 &gfc_new_block->declared_at) ==
3217 if (st == ST_FUNCTION)
3218 gfc_add_function (&sym->attr, sym->name,
3219 &gfc_new_block->declared_at);
3221 gfc_add_subroutine (&sym->attr, sym->name,
3222 &gfc_new_block->declared_at);
3226 gfc_commit_symbols ();
3229 sym = gfc_new_block;
3231 /* Mark this as a contained function, so it isn't replaced
3232 by other module functions. */
3233 sym->attr.contained = 1;
3234 sym->attr.referenced = 1;
3236 parse_progunit (ST_NONE);
3238 /* Fix up any sibling functions that refer to this one. */
3239 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3240 /* Or refer to any of its alternate entry points. */
3241 for (el = gfc_current_ns->entries; el; el = el->next)
3242 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3244 gfc_current_ns->code = s2.head;
3245 gfc_current_ns = parent_ns;
3250 /* These statements are associated with the end of the host unit. */
3251 case ST_END_FUNCTION:
3253 case ST_END_PROGRAM:
3254 case ST_END_SUBROUTINE:
3255 accept_statement (st);
3259 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3260 gfc_ascii_statement (st));
3261 reject_statement ();
3267 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3268 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3270 /* The first namespace in the list is guaranteed to not have
3271 anything (worthwhile) in it. */
3272 tmp = gfc_current_ns;
3273 gfc_current_ns = parent_ns;
3274 if (seen_error && tmp->refs > 1)
3275 gfc_free_namespace (tmp);
3277 ns = gfc_current_ns->contained;
3278 gfc_current_ns->contained = ns->sibling;
3279 gfc_free_namespace (ns);
3282 if (!contains_statements)
3283 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3284 "FUNCTION or SUBROUTINE statement at %C");
3288 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3291 parse_progunit (gfc_statement st)
3296 st = parse_spec (st);
3306 accept_statement (st);
3313 if (gfc_current_state () == COMP_FUNCTION)
3314 gfc_check_function_type (gfc_current_ns);
3319 st = parse_executable (st);
3330 accept_statement (st);
3337 unexpected_statement (st);
3338 reject_statement ();
3339 st = next_statement ();
3345 for (p = gfc_state_stack; p; p = p->previous)
3346 if (p->state == COMP_CONTAINS)
3349 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3354 gfc_error ("CONTAINS statement at %C is already in a contained "
3356 st = next_statement ();
3360 parse_contained (0);
3363 gfc_current_ns->code = gfc_state_stack->head;
3367 /* Come here to complain about a global symbol already in use as
3371 gfc_global_used (gfc_gsymbol *sym, locus *where)
3376 where = &gfc_current_locus;
3386 case GSYM_SUBROUTINE:
3387 name = "SUBROUTINE";
3392 case GSYM_BLOCK_DATA:
3393 name = "BLOCK DATA";
3399 gfc_internal_error ("gfc_gsymbol_type(): Bad type");
3403 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3404 sym->name, where, name, &sym->where);
3408 /* Parse a block data program unit. */
3411 parse_block_data (void)
3414 static locus blank_locus;
3415 static int blank_block=0;
3418 gfc_current_ns->proc_name = gfc_new_block;
3419 gfc_current_ns->is_block_data = 1;
3421 if (gfc_new_block == NULL)
3424 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3425 "prior BLOCK DATA at %L", &blank_locus);
3429 blank_locus = gfc_current_locus;
3434 s = gfc_get_gsymbol (gfc_new_block->name);
3436 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3437 gfc_global_used(s, NULL);
3440 s->type = GSYM_BLOCK_DATA;
3441 s->where = gfc_current_locus;
3446 st = parse_spec (ST_NONE);
3448 while (st != ST_END_BLOCK_DATA)
3450 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3451 gfc_ascii_statement (st));
3452 reject_statement ();
3453 st = next_statement ();
3458 /* Parse a module subprogram. */
3466 s = gfc_get_gsymbol (gfc_new_block->name);
3467 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3468 gfc_global_used(s, NULL);
3471 s->type = GSYM_MODULE;
3472 s->where = gfc_current_locus;
3476 st = parse_spec (ST_NONE);
3485 parse_contained (1);
3489 accept_statement (st);
3493 gfc_error ("Unexpected %s statement in MODULE at %C",
3494 gfc_ascii_statement (st));
3496 reject_statement ();
3497 st = next_statement ();
3503 /* Add a procedure name to the global symbol table. */
3506 add_global_procedure (int sub)
3510 s = gfc_get_gsymbol(gfc_new_block->name);
3513 || (s->type != GSYM_UNKNOWN
3514 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3515 gfc_global_used(s, NULL);
3518 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3519 s->where = gfc_current_locus;
3525 /* Add a program to the global symbol table. */
3528 add_global_program (void)
3532 if (gfc_new_block == NULL)
3534 s = gfc_get_gsymbol (gfc_new_block->name);
3536 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3537 gfc_global_used(s, NULL);
3540 s->type = GSYM_PROGRAM;
3541 s->where = gfc_current_locus;
3547 /* Top level parser. */
3550 gfc_parse_file (void)
3552 int seen_program, errors_before, errors;
3553 gfc_state_data top, s;
3557 gfc_start_source_files ();
3559 top.state = COMP_NONE;
3561 top.previous = NULL;
3562 top.head = top.tail = NULL;
3563 top.do_variable = NULL;
3565 gfc_state_stack = ⊤
3567 gfc_clear_new_st ();
3569 gfc_statement_label = NULL;
3571 if (setjmp (eof_buf))
3572 return FAILURE; /* Come here on unexpected EOF */
3576 /* Exit early for empty files. */
3582 st = next_statement ();
3591 goto duplicate_main;
3593 prog_locus = gfc_current_locus;
3595 push_state (&s, COMP_PROGRAM, gfc_new_block);
3596 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3597 accept_statement (st);
3598 add_global_program ();
3599 parse_progunit (ST_NONE);
3603 add_global_procedure (1);
3604 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3605 accept_statement (st);
3606 parse_progunit (ST_NONE);
3610 add_global_procedure (0);
3611 push_state (&s, COMP_FUNCTION, gfc_new_block);
3612 accept_statement (st);
3613 parse_progunit (ST_NONE);
3617 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3618 accept_statement (st);
3619 parse_block_data ();
3623 push_state (&s, COMP_MODULE, gfc_new_block);
3624 accept_statement (st);
3626 gfc_get_errors (NULL, &errors_before);
3630 /* Anything else starts a nameless main program block. */
3633 goto duplicate_main;
3635 prog_locus = gfc_current_locus;
3637 push_state (&s, COMP_PROGRAM, gfc_new_block);
3638 main_program_symbol (gfc_current_ns, "MAIN__");
3639 parse_progunit (st);
3643 gfc_current_ns->code = s.head;
3645 gfc_resolve (gfc_current_ns);
3647 /* Dump the parse tree if requested. */
3648 if (gfc_option.dump_parse_tree)
3649 gfc_dump_parse_tree (gfc_current_ns, stdout);
3651 gfc_get_errors (NULL, &errors);
3652 if (s.state == COMP_MODULE)
3654 gfc_dump_module (s.sym->name, errors_before == errors);
3656 gfc_generate_module_code (gfc_current_ns);
3661 gfc_generate_code (gfc_current_ns);
3669 gfc_end_source_files ();
3673 /* If we see a duplicate main program, shut down. If the second
3674 instance is an implied main program, ie data decls or executable
3675 statements, we're in for lots of errors. */
3676 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3677 reject_statement ();