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");
857 /* Return the next non-ST_NONE statement to the caller. We also worry
858 about including files and the ends of include files at this stage. */
861 next_statement (void)
865 gfc_new_block = NULL;
867 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
870 gfc_statement_label = NULL;
871 gfc_buffer_error (1);
875 if ((gfc_option.warn_line_truncation || gfc_current_form == FORM_FREE)
876 && gfc_current_locus.lb
877 && gfc_current_locus.lb->truncated)
878 gfc_warning_now ("Line truncated at %C");
883 gfc_skip_comments ();
891 if (gfc_define_undef_line ())
894 old_locus = gfc_current_locus;
896 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
902 gfc_buffer_error (0);
904 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
906 gfc_free_st_label (gfc_statement_label);
907 gfc_statement_label = NULL;
908 gfc_current_locus = old_locus;
912 check_statement_label (st);
918 /****************************** Parser ***********************************/
920 /* The parser subroutines are of type 'try' that fail if the file ends
923 /* Macros that expand to case-labels for various classes of
924 statements. Start with executable statements that directly do
927 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
928 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
929 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
930 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
931 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
932 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
933 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
934 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
935 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
937 /* Statements that mark other executable statements. */
939 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
940 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
941 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
942 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
943 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
944 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
947 /* Declaration statements */
949 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
950 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
951 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
954 /* Block end statements. Errors associated with interchanging these
955 are detected in gfc_match_end(). */
957 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
958 case ST_END_PROGRAM: case ST_END_SUBROUTINE
961 /* Push a new state onto the stack. */
964 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
966 p->state = new_state;
967 p->previous = gfc_state_stack;
969 p->head = p->tail = NULL;
970 p->do_variable = NULL;
975 /* Pop the current state. */
979 gfc_state_stack = gfc_state_stack->previous;
983 /* Try to find the given state in the state stack. */
986 gfc_find_state (gfc_compile_state state)
990 for (p = gfc_state_stack; p; p = p->previous)
991 if (p->state == state)
994 return (p == NULL) ? FAILURE : SUCCESS;
998 /* Starts a new level in the statement list. */
1001 new_level (gfc_code *q)
1005 p = q->block = gfc_get_code ();
1007 gfc_state_stack->head = gfc_state_stack->tail = p;
1013 /* Add the current new_st code structure and adds it to the current
1014 program unit. As a side-effect, it zeroes the new_st. */
1017 add_statement (void)
1021 p = gfc_get_code ();
1024 p->loc = gfc_current_locus;
1026 if (gfc_state_stack->head == NULL)
1027 gfc_state_stack->head = p;
1029 gfc_state_stack->tail->next = p;
1031 while (p->next != NULL)
1034 gfc_state_stack->tail = p;
1036 gfc_clear_new_st ();
1042 /* Frees everything associated with the current statement. */
1045 undo_new_statement (void)
1047 gfc_free_statements (new_st.block);
1048 gfc_free_statements (new_st.next);
1049 gfc_free_statement (&new_st);
1050 gfc_clear_new_st ();
1054 /* If the current statement has a statement label, make sure that it
1055 is allowed to, or should have one. */
1058 check_statement_label (gfc_statement st)
1062 if (gfc_statement_label == NULL)
1064 if (st == ST_FORMAT)
1065 gfc_error ("FORMAT statement at %L does not have a statement label",
1072 case ST_END_PROGRAM:
1073 case ST_END_FUNCTION:
1074 case ST_END_SUBROUTINE:
1080 type = ST_LABEL_TARGET;
1084 type = ST_LABEL_FORMAT;
1087 /* Statement labels are not restricted from appearing on a
1088 particular line. However, there are plenty of situations
1089 where the resulting label can't be referenced. */
1092 type = ST_LABEL_BAD_TARGET;
1096 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1098 new_st.here = gfc_statement_label;
1102 /* Figures out what the enclosing program unit is. This will be a
1103 function, subroutine, program, block data or module. */
1106 gfc_enclosing_unit (gfc_compile_state * result)
1110 for (p = gfc_state_stack; p; p = p->previous)
1111 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1112 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1113 || p->state == COMP_PROGRAM)
1122 *result = COMP_PROGRAM;
1127 /* Translate a statement enum to a string. */
1130 gfc_ascii_statement (gfc_statement st)
1136 case ST_ARITHMETIC_IF:
1137 p = _("arithmetic IF");
1143 p = _("attribute declaration");
1173 p = _("data declaration");
1181 case ST_DERIVED_DECL:
1182 p = _("derived type declaration");
1196 case ST_END_BLOCK_DATA:
1197 p = "END BLOCK DATA";
1208 case ST_END_FUNCTION:
1214 case ST_END_INTERFACE:
1215 p = "END INTERFACE";
1220 case ST_END_PROGRAM:
1226 case ST_END_SUBROUTINE:
1227 p = "END SUBROUTINE";
1238 case ST_EQUIVALENCE:
1247 case ST_FORALL_BLOCK: /* Fall through */
1269 case ST_IMPLICIT_NONE:
1270 p = "IMPLICIT NONE";
1272 case ST_IMPLIED_ENDDO:
1273 p = _("implied END DO");
1299 case ST_MODULE_PROC:
1300 p = "MODULE PROCEDURE";
1338 case ST_WHERE_BLOCK: /* Fall through */
1349 p = _("assignment");
1351 case ST_POINTER_ASSIGNMENT:
1352 p = _("pointer assignment");
1354 case ST_SELECT_CASE:
1363 case ST_STATEMENT_FUNCTION:
1364 p = "STATEMENT FUNCTION";
1366 case ST_LABEL_ASSIGNMENT:
1367 p = "LABEL ASSIGNMENT";
1370 p = "ENUM DEFINITION";
1373 p = "ENUMERATOR DEFINITION";
1381 case ST_OMP_BARRIER:
1382 p = "!$OMP BARRIER";
1384 case ST_OMP_CRITICAL:
1385 p = "!$OMP CRITICAL";
1390 case ST_OMP_END_CRITICAL:
1391 p = "!$OMP END CRITICAL";
1396 case ST_OMP_END_MASTER:
1397 p = "!$OMP END MASTER";
1399 case ST_OMP_END_ORDERED:
1400 p = "!$OMP END ORDERED";
1402 case ST_OMP_END_PARALLEL:
1403 p = "!$OMP END PARALLEL";
1405 case ST_OMP_END_PARALLEL_DO:
1406 p = "!$OMP END PARALLEL DO";
1408 case ST_OMP_END_PARALLEL_SECTIONS:
1409 p = "!$OMP END PARALLEL SECTIONS";
1411 case ST_OMP_END_PARALLEL_WORKSHARE:
1412 p = "!$OMP END PARALLEL WORKSHARE";
1414 case ST_OMP_END_SECTIONS:
1415 p = "!$OMP END SECTIONS";
1417 case ST_OMP_END_SINGLE:
1418 p = "!$OMP END SINGLE";
1420 case ST_OMP_END_TASK:
1421 p = "!$OMP END TASK";
1423 case ST_OMP_END_WORKSHARE:
1424 p = "!$OMP END WORKSHARE";
1432 case ST_OMP_ORDERED:
1433 p = "!$OMP ORDERED";
1435 case ST_OMP_PARALLEL:
1436 p = "!$OMP PARALLEL";
1438 case ST_OMP_PARALLEL_DO:
1439 p = "!$OMP PARALLEL DO";
1441 case ST_OMP_PARALLEL_SECTIONS:
1442 p = "!$OMP PARALLEL SECTIONS";
1444 case ST_OMP_PARALLEL_WORKSHARE:
1445 p = "!$OMP PARALLEL WORKSHARE";
1447 case ST_OMP_SECTIONS:
1448 p = "!$OMP SECTIONS";
1450 case ST_OMP_SECTION:
1451 p = "!$OMP SECTION";
1459 case ST_OMP_TASKWAIT:
1460 p = "!$OMP TASKWAIT";
1462 case ST_OMP_THREADPRIVATE:
1463 p = "!$OMP THREADPRIVATE";
1465 case ST_OMP_WORKSHARE:
1466 p = "!$OMP WORKSHARE";
1469 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1476 /* Create a symbol for the main program and assign it to ns->proc_name. */
1479 main_program_symbol (gfc_namespace *ns, const char *name)
1481 gfc_symbol *main_program;
1482 symbol_attribute attr;
1484 gfc_get_symbol (name, ns, &main_program);
1485 gfc_clear_attr (&attr);
1486 attr.flavor = FL_PROGRAM;
1487 attr.proc = PROC_UNKNOWN;
1488 attr.subroutine = 1;
1489 attr.access = ACCESS_PUBLIC;
1490 attr.is_main_program = 1;
1491 main_program->attr = attr;
1492 main_program->declared_at = gfc_current_locus;
1493 ns->proc_name = main_program;
1494 gfc_commit_symbols ();
1498 /* Do whatever is necessary to accept the last statement. */
1501 accept_statement (gfc_statement st)
1509 case ST_IMPLICIT_NONE:
1510 gfc_set_implicit_none ();
1519 gfc_current_ns->proc_name = gfc_new_block;
1522 /* If the statement is the end of a block, lay down a special code
1523 that allows a branch to the end of the block from within the
1524 construct. IF and SELECT are treated differently from DO
1525 (where EXEC_NOP is added inside the loop) for two
1527 1. END DO has a meaning in the sense that after a GOTO to
1528 it, the loop counter must be increased.
1529 2. IF blocks and SELECT blocks can consist of multiple
1530 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1531 Putting the label before the END IF would make the jump
1532 from, say, the ELSE IF block to the END IF illegal. */
1536 if (gfc_statement_label != NULL)
1538 new_st.op = EXEC_END_BLOCK;
1543 /* The end-of-program unit statements do not get the special
1544 marker and require a statement of some sort if they are a
1547 case ST_END_PROGRAM:
1548 case ST_END_FUNCTION:
1549 case ST_END_SUBROUTINE:
1550 if (gfc_statement_label != NULL)
1552 new_st.op = EXEC_RETURN;
1557 new_st.op = EXEC_END_PROCEDURE;
1573 gfc_commit_symbols ();
1574 gfc_warning_check ();
1575 gfc_clear_new_st ();
1579 /* Undo anything tentative that has been built for the current
1583 reject_statement (void)
1585 /* Revert to the previous charlen chain. */
1586 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1587 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1589 gfc_new_block = NULL;
1590 gfc_undo_symbols ();
1591 gfc_clear_warning ();
1592 undo_new_statement ();
1596 /* Generic complaint about an out of order statement. We also do
1597 whatever is necessary to clean up. */
1600 unexpected_statement (gfc_statement st)
1602 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1604 reject_statement ();
1608 /* Given the next statement seen by the matcher, make sure that it is
1609 in proper order with the last. This subroutine is initialized by
1610 calling it with an argument of ST_NONE. If there is a problem, we
1611 issue an error and return FAILURE. Otherwise we return SUCCESS.
1613 Individual parsers need to verify that the statements seen are
1614 valid before calling here, i.e., ENTRY statements are not allowed in
1615 INTERFACE blocks. The following diagram is taken from the standard:
1617 +---------------------------------------+
1618 | program subroutine function module |
1619 +---------------------------------------+
1621 +---------------------------------------+
1623 +---------------------------------------+
1625 | +-----------+------------------+
1626 | | parameter | implicit |
1627 | +-----------+------------------+
1628 | format | | derived type |
1629 | entry | parameter | interface |
1630 | | data | specification |
1631 | | | statement func |
1632 | +-----------+------------------+
1633 | | data | executable |
1634 +--------+-----------+------------------+
1636 +---------------------------------------+
1637 | internal module/subprogram |
1638 +---------------------------------------+
1640 +---------------------------------------+
1649 ORDER_IMPLICIT_NONE,
1657 enum state_order state;
1658 gfc_statement last_statement;
1664 verify_st_order (st_state *p, gfc_statement st, bool silent)
1670 p->state = ORDER_START;
1674 if (p->state > ORDER_USE)
1676 p->state = ORDER_USE;
1680 if (p->state > ORDER_IMPORT)
1682 p->state = ORDER_IMPORT;
1685 case ST_IMPLICIT_NONE:
1686 if (p->state > ORDER_IMPLICIT_NONE)
1689 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1690 statement disqualifies a USE but not an IMPLICIT NONE.
1691 Duplicate IMPLICIT NONEs are caught when the implicit types
1694 p->state = ORDER_IMPLICIT_NONE;
1698 if (p->state > ORDER_IMPLICIT)
1700 p->state = ORDER_IMPLICIT;
1705 if (p->state < ORDER_IMPLICIT_NONE)
1706 p->state = ORDER_IMPLICIT_NONE;
1710 if (p->state >= ORDER_EXEC)
1712 if (p->state < ORDER_IMPLICIT)
1713 p->state = ORDER_IMPLICIT;
1717 if (p->state < ORDER_SPEC)
1718 p->state = ORDER_SPEC;
1723 case ST_DERIVED_DECL:
1725 if (p->state >= ORDER_EXEC)
1727 if (p->state < ORDER_SPEC)
1728 p->state = ORDER_SPEC;
1733 if (p->state < ORDER_EXEC)
1734 p->state = ORDER_EXEC;
1738 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1739 gfc_ascii_statement (st));
1742 /* All is well, record the statement in case we need it next time. */
1743 p->where = gfc_current_locus;
1744 p->last_statement = st;
1749 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1750 gfc_ascii_statement (st),
1751 gfc_ascii_statement (p->last_statement), &p->where);
1757 /* Handle an unexpected end of file. This is a show-stopper... */
1759 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1762 unexpected_eof (void)
1766 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1768 /* Memory cleanup. Move to "second to last". */
1769 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1772 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1775 longjmp (eof_buf, 1);
1779 /* Parse the CONTAINS section of a derived type definition. */
1781 gfc_access gfc_typebound_default_access;
1784 parse_derived_contains (void)
1787 bool seen_private = false;
1788 bool seen_comps = false;
1789 bool error_flag = false;
1792 gcc_assert (gfc_current_state () == COMP_DERIVED);
1793 gcc_assert (gfc_current_block ());
1795 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1797 if (gfc_current_block ()->attr.sequence)
1798 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1799 " section at %C", gfc_current_block ()->name);
1800 if (gfc_current_block ()->attr.is_bind_c)
1801 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1802 " section at %C", gfc_current_block ()->name);
1804 accept_statement (ST_CONTAINS);
1805 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1807 gfc_typebound_default_access = ACCESS_PUBLIC;
1813 st = next_statement ();
1821 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1826 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1827 " procedure at %C") == FAILURE)
1830 accept_statement (ST_PROCEDURE);
1835 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1836 " at %C") == FAILURE)
1839 accept_statement (ST_GENERIC);
1844 if (gfc_notify_std (GFC_STD_F2003,
1845 "Fortran 2003: FINAL procedure declaration"
1846 " at %C") == FAILURE)
1849 accept_statement (ST_FINAL);
1857 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1858 "definition at %C with empty CONTAINS "
1859 "section") == FAILURE))
1862 /* ST_END_TYPE is accepted by parse_derived after return. */
1866 if (gfc_find_state (COMP_MODULE) == FAILURE)
1868 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1876 gfc_error ("PRIVATE statement at %C must precede procedure"
1884 gfc_error ("Duplicate PRIVATE statement at %C");
1888 accept_statement (ST_PRIVATE);
1889 gfc_typebound_default_access = ACCESS_PRIVATE;
1890 seen_private = true;
1894 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1899 gfc_error ("Already inside a CONTAINS block at %C");
1904 unexpected_statement (st);
1910 gcc_assert (gfc_current_state () == COMP_DERIVED);
1916 /* Parse a derived type. */
1919 parse_derived (void)
1921 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1924 gfc_symbol *derived_sym = NULL;
1930 accept_statement (ST_DERIVED_DECL);
1931 push_state (&s, COMP_DERIVED, gfc_new_block);
1933 gfc_new_block->component_access = ACCESS_PUBLIC;
1940 while (compiling_type)
1942 st = next_statement ();
1950 accept_statement (st);
1955 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1964 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1965 "definition at %C without components")
1969 accept_statement (ST_END_TYPE);
1973 if (gfc_find_state (COMP_MODULE) == FAILURE)
1975 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1983 gfc_error ("PRIVATE statement at %C must precede "
1984 "structure components");
1991 gfc_error ("Duplicate PRIVATE statement at %C");
1995 s.sym->component_access = ACCESS_PRIVATE;
1997 accept_statement (ST_PRIVATE);
2004 gfc_error ("SEQUENCE statement at %C must precede "
2005 "structure components");
2010 if (gfc_current_block ()->attr.sequence)
2011 gfc_warning ("SEQUENCE attribute at %C already specified in "
2016 gfc_error ("Duplicate SEQUENCE statement at %C");
2021 gfc_add_sequence (&gfc_current_block ()->attr,
2022 gfc_current_block ()->name, NULL);
2026 if (gfc_notify_std (GFC_STD_F2003,
2027 "Fortran 2003: CONTAINS block in derived type"
2028 " definition at %C") == FAILURE)
2031 accept_statement (ST_CONTAINS);
2032 if (parse_derived_contains ())
2037 unexpected_statement (st);
2042 /* need to verify that all fields of the derived type are
2043 * interoperable with C if the type is declared to be bind(c)
2045 derived_sym = gfc_current_block();
2047 sym = gfc_current_block ();
2048 for (c = sym->components; c; c = c->next)
2050 /* Look for allocatable components. */
2051 if (c->attr.allocatable
2052 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2053 sym->attr.alloc_comp = 1;
2055 /* Look for pointer components. */
2057 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2058 sym->attr.pointer_comp = 1;
2060 /* Look for procedure pointer components. */
2061 if (c->attr.proc_pointer
2062 || (c->ts.type == BT_DERIVED
2063 && c->ts.u.derived->attr.proc_pointer_comp))
2064 sym->attr.proc_pointer_comp = 1;
2066 /* Look for private components. */
2067 if (sym->component_access == ACCESS_PRIVATE
2068 || c->attr.access == ACCESS_PRIVATE
2069 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2070 sym->attr.private_comp = 1;
2073 if (!seen_component)
2074 sym->attr.zero_comp = 1;
2080 /* Parse an ENUM. */
2089 int seen_enumerator = 0;
2093 push_state (&s, COMP_ENUM, gfc_new_block);
2097 while (compiling_enum)
2099 st = next_statement ();
2107 seen_enumerator = 1;
2108 accept_statement (st);
2113 if (!seen_enumerator)
2115 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2118 accept_statement (st);
2122 gfc_free_enum_history ();
2123 unexpected_statement (st);
2131 /* Parse an interface. We must be able to deal with the possibility
2132 of recursive interfaces. The parse_spec() subroutine is mutually
2133 recursive with parse_interface(). */
2135 static gfc_statement parse_spec (gfc_statement);
2138 parse_interface (void)
2140 gfc_compile_state new_state = COMP_NONE, current_state;
2141 gfc_symbol *prog_unit, *sym;
2142 gfc_interface_info save;
2143 gfc_state_data s1, s2;
2147 accept_statement (ST_INTERFACE);
2149 current_interface.ns = gfc_current_ns;
2150 save = current_interface;
2152 sym = (current_interface.type == INTERFACE_GENERIC
2153 || current_interface.type == INTERFACE_USER_OP)
2154 ? gfc_new_block : NULL;
2156 push_state (&s1, COMP_INTERFACE, sym);
2157 current_state = COMP_NONE;
2160 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2162 st = next_statement ();
2170 if (st == ST_SUBROUTINE)
2171 new_state = COMP_SUBROUTINE;
2172 else if (st == ST_FUNCTION)
2173 new_state = COMP_FUNCTION;
2174 if (gfc_new_block->attr.pointer)
2176 gfc_new_block->attr.pointer = 0;
2177 gfc_new_block->attr.proc_pointer = 1;
2179 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2180 gfc_new_block->formal, NULL) == FAILURE)
2182 reject_statement ();
2183 gfc_free_namespace (gfc_current_ns);
2189 case ST_MODULE_PROC: /* The module procedure matcher makes
2190 sure the context is correct. */
2191 accept_statement (st);
2192 gfc_free_namespace (gfc_current_ns);
2195 case ST_END_INTERFACE:
2196 gfc_free_namespace (gfc_current_ns);
2197 gfc_current_ns = current_interface.ns;
2201 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2202 gfc_ascii_statement (st));
2203 reject_statement ();
2204 gfc_free_namespace (gfc_current_ns);
2209 /* Make sure that a generic interface has only subroutines or
2210 functions and that the generic name has the right attribute. */
2211 if (current_interface.type == INTERFACE_GENERIC)
2213 if (current_state == COMP_NONE)
2215 if (new_state == COMP_FUNCTION)
2216 gfc_add_function (&sym->attr, sym->name, NULL);
2217 else if (new_state == COMP_SUBROUTINE)
2218 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2220 current_state = new_state;
2224 if (new_state != current_state)
2226 if (new_state == COMP_SUBROUTINE)
2227 gfc_error ("SUBROUTINE at %C does not belong in a "
2228 "generic function interface");
2230 if (new_state == COMP_FUNCTION)
2231 gfc_error ("FUNCTION at %C does not belong in a "
2232 "generic subroutine interface");
2237 if (current_interface.type == INTERFACE_ABSTRACT)
2239 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2240 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2241 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2242 "cannot be the same as an intrinsic type",
2243 gfc_new_block->name);
2246 push_state (&s2, new_state, gfc_new_block);
2247 accept_statement (st);
2248 prog_unit = gfc_new_block;
2249 prog_unit->formal_ns = gfc_current_ns;
2250 proc_locus = gfc_current_locus;
2253 /* Read data declaration statements. */
2254 st = parse_spec (ST_NONE);
2256 /* Since the interface block does not permit an IMPLICIT statement,
2257 the default type for the function or the result must be taken
2258 from the formal namespace. */
2259 if (new_state == COMP_FUNCTION)
2261 if (prog_unit->result == prog_unit
2262 && prog_unit->ts.type == BT_UNKNOWN)
2263 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2264 else if (prog_unit->result != prog_unit
2265 && prog_unit->result->ts.type == BT_UNKNOWN)
2266 gfc_set_default_type (prog_unit->result, 1,
2267 prog_unit->formal_ns);
2270 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2272 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2273 gfc_ascii_statement (st));
2274 reject_statement ();
2278 /* Add EXTERNAL attribute to function or subroutine. */
2279 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2280 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2282 current_interface = save;
2283 gfc_add_interface (prog_unit);
2286 if (current_interface.ns
2287 && current_interface.ns->proc_name
2288 && strcmp (current_interface.ns->proc_name->name,
2289 prog_unit->name) == 0)
2290 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2291 "enclosing procedure", prog_unit->name, &proc_locus);
2300 /* Associate function characteristics by going back to the function
2301 declaration and rematching the prefix. */
2304 match_deferred_characteristics (gfc_typespec * ts)
2307 match m = MATCH_ERROR;
2308 char name[GFC_MAX_SYMBOL_LEN + 1];
2310 loc = gfc_current_locus;
2312 gfc_current_locus = gfc_current_block ()->declared_at;
2315 gfc_buffer_error (1);
2316 m = gfc_match_prefix (ts);
2317 gfc_buffer_error (0);
2319 if (ts->type == BT_DERIVED)
2323 if (!ts->u.derived || !ts->u.derived->components)
2327 /* Only permit one go at the characteristic association. */
2331 /* Set the function locus correctly. If we have not found the
2332 function name, there is an error. */
2334 && gfc_match ("function% %n", name) == MATCH_YES
2335 && strcmp (name, gfc_current_block ()->name) == 0)
2337 gfc_current_block ()->declared_at = gfc_current_locus;
2338 gfc_commit_symbols ();
2343 gfc_current_locus =loc;
2348 /* Check specification-expressions in the function result of the currently
2349 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2350 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2351 scope are not yet parsed so this has to be delayed up to parse_spec. */
2354 check_function_result_typed (void)
2356 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2358 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2359 gcc_assert (ts->type != BT_UNKNOWN);
2361 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2362 /* TODO: Extend when KIND type parameters are implemented. */
2363 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2364 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2368 /* Parse a set of specification statements. Returns the statement
2369 that doesn't fit. */
2371 static gfc_statement
2372 parse_spec (gfc_statement st)
2375 bool function_result_typed = false;
2376 bool bad_characteristic = false;
2379 verify_st_order (&ss, ST_NONE, false);
2381 st = next_statement ();
2383 /* If we are not inside a function or don't have a result specified so far,
2384 do nothing special about it. */
2385 if (gfc_current_state () != COMP_FUNCTION)
2386 function_result_typed = true;
2389 gfc_symbol* proc = gfc_current_ns->proc_name;
2392 if (proc->result->ts.type == BT_UNKNOWN)
2393 function_result_typed = true;
2398 /* If we find a statement that can not be followed by an IMPLICIT statement
2399 (and thus we can expect to see none any further), type the function result
2400 if it has not yet been typed. Be careful not to give the END statement
2401 to verify_st_order! */
2402 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2404 bool verify_now = false;
2406 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2411 verify_st_order (&dummyss, ST_NONE, false);
2412 verify_st_order (&dummyss, st, false);
2414 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2420 check_function_result_typed ();
2421 function_result_typed = true;
2430 case ST_IMPLICIT_NONE:
2432 if (!function_result_typed)
2434 check_function_result_typed ();
2435 function_result_typed = true;
2441 case ST_DATA: /* Not allowed in interfaces */
2442 if (gfc_current_state () == COMP_INTERFACE)
2452 case ST_DERIVED_DECL:
2455 if (verify_st_order (&ss, st, false) == FAILURE)
2457 reject_statement ();
2458 st = next_statement ();
2468 case ST_DERIVED_DECL:
2474 if (gfc_current_state () != COMP_MODULE)
2476 gfc_error ("%s statement must appear in a MODULE",
2477 gfc_ascii_statement (st));
2481 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2483 gfc_error ("%s statement at %C follows another accessibility "
2484 "specification", gfc_ascii_statement (st));
2488 gfc_current_ns->default_access = (st == ST_PUBLIC)
2489 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2493 case ST_STATEMENT_FUNCTION:
2494 if (gfc_current_state () == COMP_MODULE)
2496 unexpected_statement (st);
2504 accept_statement (st);
2505 st = next_statement ();
2509 accept_statement (st);
2511 st = next_statement ();
2514 case ST_GET_FCN_CHARACTERISTICS:
2515 /* This statement triggers the association of a function's result
2517 ts = &gfc_current_block ()->result->ts;
2518 if (match_deferred_characteristics (ts) != MATCH_YES)
2519 bad_characteristic = true;
2521 st = next_statement ();
2528 /* If match_deferred_characteristics failed, then there is an error. */
2529 if (bad_characteristic)
2531 ts = &gfc_current_block ()->result->ts;
2532 if (ts->type != BT_DERIVED)
2533 gfc_error ("Bad kind expression for function '%s' at %L",
2534 gfc_current_block ()->name,
2535 &gfc_current_block ()->declared_at);
2537 gfc_error ("The type for function '%s' at %L is not accessible",
2538 gfc_current_block ()->name,
2539 &gfc_current_block ()->declared_at);
2541 gfc_current_block ()->ts.kind = 0;
2542 /* Keep the derived type; if it's bad, it will be discovered later. */
2543 if (!(ts->type == BT_DERIVED && ts->u.derived))
2544 ts->type = BT_UNKNOWN;
2551 /* Parse a WHERE block, (not a simple WHERE statement). */
2554 parse_where_block (void)
2556 int seen_empty_else;
2561 accept_statement (ST_WHERE_BLOCK);
2562 top = gfc_state_stack->tail;
2564 push_state (&s, COMP_WHERE, gfc_new_block);
2566 d = add_statement ();
2567 d->expr1 = top->expr1;
2573 seen_empty_else = 0;
2577 st = next_statement ();
2583 case ST_WHERE_BLOCK:
2584 parse_where_block ();
2589 accept_statement (st);
2593 if (seen_empty_else)
2595 gfc_error ("ELSEWHERE statement at %C follows previous "
2596 "unmasked ELSEWHERE");
2600 if (new_st.expr1 == NULL)
2601 seen_empty_else = 1;
2603 d = new_level (gfc_state_stack->head);
2605 d->expr1 = new_st.expr1;
2607 accept_statement (st);
2612 accept_statement (st);
2616 gfc_error ("Unexpected %s statement in WHERE block at %C",
2617 gfc_ascii_statement (st));
2618 reject_statement ();
2622 while (st != ST_END_WHERE);
2628 /* Parse a FORALL block (not a simple FORALL statement). */
2631 parse_forall_block (void)
2637 accept_statement (ST_FORALL_BLOCK);
2638 top = gfc_state_stack->tail;
2640 push_state (&s, COMP_FORALL, gfc_new_block);
2642 d = add_statement ();
2643 d->op = EXEC_FORALL;
2648 st = next_statement ();
2653 case ST_POINTER_ASSIGNMENT:
2656 accept_statement (st);
2659 case ST_WHERE_BLOCK:
2660 parse_where_block ();
2663 case ST_FORALL_BLOCK:
2664 parse_forall_block ();
2668 accept_statement (st);
2675 gfc_error ("Unexpected %s statement in FORALL block at %C",
2676 gfc_ascii_statement (st));
2678 reject_statement ();
2682 while (st != ST_END_FORALL);
2688 static gfc_statement parse_executable (gfc_statement);
2690 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2693 parse_if_block (void)
2702 accept_statement (ST_IF_BLOCK);
2704 top = gfc_state_stack->tail;
2705 push_state (&s, COMP_IF, gfc_new_block);
2707 new_st.op = EXEC_IF;
2708 d = add_statement ();
2710 d->expr1 = top->expr1;
2716 st = parse_executable (ST_NONE);
2726 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2727 "statement at %L", &else_locus);
2729 reject_statement ();
2733 d = new_level (gfc_state_stack->head);
2735 d->expr1 = new_st.expr1;
2737 accept_statement (st);
2744 gfc_error ("Duplicate ELSE statements at %L and %C",
2746 reject_statement ();
2751 else_locus = gfc_current_locus;
2753 d = new_level (gfc_state_stack->head);
2756 accept_statement (st);
2764 unexpected_statement (st);
2768 while (st != ST_ENDIF);
2771 accept_statement (st);
2775 /* Parse a SELECT block. */
2778 parse_select_block (void)
2784 accept_statement (ST_SELECT_CASE);
2786 cp = gfc_state_stack->tail;
2787 push_state (&s, COMP_SELECT, gfc_new_block);
2789 /* Make sure that the next statement is a CASE or END SELECT. */
2792 st = next_statement ();
2795 if (st == ST_END_SELECT)
2797 /* Empty SELECT CASE is OK. */
2798 accept_statement (st);
2805 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2808 reject_statement ();
2811 /* At this point, we're got a nonempty select block. */
2812 cp = new_level (cp);
2815 accept_statement (st);
2819 st = parse_executable (ST_NONE);
2826 cp = new_level (gfc_state_stack->head);
2828 gfc_clear_new_st ();
2830 accept_statement (st);
2836 /* Can't have an executable statement because of
2837 parse_executable(). */
2839 unexpected_statement (st);
2843 while (st != ST_END_SELECT);
2846 accept_statement (st);
2850 /* Given a symbol, make sure it is not an iteration variable for a DO
2851 statement. This subroutine is called when the symbol is seen in a
2852 context that causes it to become redefined. If the symbol is an
2853 iterator, we generate an error message and return nonzero. */
2856 gfc_check_do_variable (gfc_symtree *st)
2860 for (s=gfc_state_stack; s; s = s->previous)
2861 if (s->do_variable == st)
2863 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2864 "loop beginning at %L", st->name, &s->head->loc);
2872 /* Checks to see if the current statement label closes an enddo.
2873 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2874 an error) if it incorrectly closes an ENDDO. */
2877 check_do_closure (void)
2881 if (gfc_statement_label == NULL)
2884 for (p = gfc_state_stack; p; p = p->previous)
2885 if (p->state == COMP_DO)
2889 return 0; /* No loops to close */
2891 if (p->ext.end_do_label == gfc_statement_label)
2893 if (p == gfc_state_stack)
2896 gfc_error ("End of nonblock DO statement at %C is within another block");
2900 /* At this point, the label doesn't terminate the innermost loop.
2901 Make sure it doesn't terminate another one. */
2902 for (; p; p = p->previous)
2903 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2905 gfc_error ("End of nonblock DO statement at %C is interwoven "
2906 "with another DO loop");
2914 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2915 handled inside of parse_executable(), because they aren't really
2919 parse_do_block (void)
2926 s.ext.end_do_label = new_st.label1;
2928 if (new_st.ext.iterator != NULL)
2929 stree = new_st.ext.iterator->var->symtree;
2933 accept_statement (ST_DO);
2935 top = gfc_state_stack->tail;
2936 push_state (&s, COMP_DO, gfc_new_block);
2938 s.do_variable = stree;
2940 top->block = new_level (top);
2941 top->block->op = EXEC_DO;
2944 st = parse_executable (ST_NONE);
2952 if (s.ext.end_do_label != NULL
2953 && s.ext.end_do_label != gfc_statement_label)
2954 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2957 if (gfc_statement_label != NULL)
2959 new_st.op = EXEC_NOP;
2964 case ST_IMPLIED_ENDDO:
2965 /* If the do-stmt of this DO construct has a do-construct-name,
2966 the corresponding end-do must be an end-do-stmt (with a matching
2967 name, but in that case we must have seen ST_ENDDO first).
2968 We only complain about this in pedantic mode. */
2969 if (gfc_current_block () != NULL)
2970 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2971 &gfc_current_block()->declared_at);
2976 unexpected_statement (st);
2981 accept_statement (st);
2985 /* Parse the statements of OpenMP do/parallel do. */
2987 static gfc_statement
2988 parse_omp_do (gfc_statement omp_st)
2994 accept_statement (omp_st);
2996 cp = gfc_state_stack->tail;
2997 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2998 np = new_level (cp);
3004 st = next_statement ();
3007 else if (st == ST_DO)
3010 unexpected_statement (st);
3014 if (gfc_statement_label != NULL
3015 && gfc_state_stack->previous != NULL
3016 && gfc_state_stack->previous->state == COMP_DO
3017 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3025 there should be no !$OMP END DO. */
3027 return ST_IMPLIED_ENDDO;
3030 check_do_closure ();
3033 st = next_statement ();
3034 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3036 if (new_st.op == EXEC_OMP_END_NOWAIT)
3037 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3039 gcc_assert (new_st.op == EXEC_NOP);
3040 gfc_clear_new_st ();
3041 gfc_commit_symbols ();
3042 gfc_warning_check ();
3043 st = next_statement ();
3049 /* Parse the statements of OpenMP atomic directive. */
3052 parse_omp_atomic (void)
3058 accept_statement (ST_OMP_ATOMIC);
3060 cp = gfc_state_stack->tail;
3061 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3062 np = new_level (cp);
3068 st = next_statement ();
3071 else if (st == ST_ASSIGNMENT)
3074 unexpected_statement (st);
3077 accept_statement (st);
3083 /* Parse the statements of an OpenMP structured block. */
3086 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3088 gfc_statement st, omp_end_st;
3092 accept_statement (omp_st);
3094 cp = gfc_state_stack->tail;
3095 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3096 np = new_level (cp);
3102 case ST_OMP_PARALLEL:
3103 omp_end_st = ST_OMP_END_PARALLEL;
3105 case ST_OMP_PARALLEL_SECTIONS:
3106 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3108 case ST_OMP_SECTIONS:
3109 omp_end_st = ST_OMP_END_SECTIONS;
3111 case ST_OMP_ORDERED:
3112 omp_end_st = ST_OMP_END_ORDERED;
3114 case ST_OMP_CRITICAL:
3115 omp_end_st = ST_OMP_END_CRITICAL;
3118 omp_end_st = ST_OMP_END_MASTER;
3121 omp_end_st = ST_OMP_END_SINGLE;
3124 omp_end_st = ST_OMP_END_TASK;
3126 case ST_OMP_WORKSHARE:
3127 omp_end_st = ST_OMP_END_WORKSHARE;
3129 case ST_OMP_PARALLEL_WORKSHARE:
3130 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3138 if (workshare_stmts_only)
3140 /* Inside of !$omp workshare, only
3143 where statements and constructs
3144 forall statements and constructs
3148 are allowed. For !$omp critical these
3149 restrictions apply recursively. */
3152 st = next_statement ();
3163 accept_statement (st);
3166 case ST_WHERE_BLOCK:
3167 parse_where_block ();
3170 case ST_FORALL_BLOCK:
3171 parse_forall_block ();
3174 case ST_OMP_PARALLEL:
3175 case ST_OMP_PARALLEL_SECTIONS:
3176 parse_omp_structured_block (st, false);
3179 case ST_OMP_PARALLEL_WORKSHARE:
3180 case ST_OMP_CRITICAL:
3181 parse_omp_structured_block (st, true);
3184 case ST_OMP_PARALLEL_DO:
3185 st = parse_omp_do (st);
3189 parse_omp_atomic ();
3200 st = next_statement ();
3204 st = parse_executable (ST_NONE);
3207 else if (st == ST_OMP_SECTION
3208 && (omp_st == ST_OMP_SECTIONS
3209 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3211 np = new_level (np);
3215 else if (st != omp_end_st)
3216 unexpected_statement (st);
3218 while (st != omp_end_st);
3222 case EXEC_OMP_END_NOWAIT:
3223 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3225 case EXEC_OMP_CRITICAL:
3226 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3227 || (new_st.ext.omp_name != NULL
3228 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3229 gfc_error ("Name after !$omp critical and !$omp end critical does "
3231 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3233 case EXEC_OMP_END_SINGLE:
3234 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3235 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3236 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3237 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3245 gfc_clear_new_st ();
3246 gfc_commit_symbols ();
3247 gfc_warning_check ();
3252 /* Accept a series of executable statements. We return the first
3253 statement that doesn't fit to the caller. Any block statements are
3254 passed on to the correct handler, which usually passes the buck
3257 static gfc_statement
3258 parse_executable (gfc_statement st)
3263 st = next_statement ();
3267 close_flag = check_do_closure ();
3272 case ST_END_PROGRAM:
3275 case ST_END_FUNCTION:
3279 case ST_END_SUBROUTINE:
3284 case ST_SELECT_CASE:
3285 gfc_error ("%s statement at %C cannot terminate a non-block "
3286 "DO loop", gfc_ascii_statement (st));
3302 accept_statement (st);
3303 if (close_flag == 1)
3304 return ST_IMPLIED_ENDDO;
3311 case ST_SELECT_CASE:
3312 parse_select_block ();
3317 if (check_do_closure () == 1)
3318 return ST_IMPLIED_ENDDO;
3321 case ST_WHERE_BLOCK:
3322 parse_where_block ();
3325 case ST_FORALL_BLOCK:
3326 parse_forall_block ();
3329 case ST_OMP_PARALLEL:
3330 case ST_OMP_PARALLEL_SECTIONS:
3331 case ST_OMP_SECTIONS:
3332 case ST_OMP_ORDERED:
3333 case ST_OMP_CRITICAL:
3337 parse_omp_structured_block (st, false);
3340 case ST_OMP_WORKSHARE:
3341 case ST_OMP_PARALLEL_WORKSHARE:
3342 parse_omp_structured_block (st, true);
3346 case ST_OMP_PARALLEL_DO:
3347 st = parse_omp_do (st);
3348 if (st == ST_IMPLIED_ENDDO)
3353 parse_omp_atomic ();
3360 st = next_statement ();
3365 /* Parse a series of contained program units. */
3367 static void parse_progunit (gfc_statement);
3370 /* Fix the symbols for sibling functions. These are incorrectly added to
3371 the child namespace as the parser didn't know about this procedure. */
3374 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3378 gfc_symbol *old_sym;
3380 sym->attr.referenced = 1;
3381 for (ns = siblings; ns; ns = ns->sibling)
3383 st = gfc_find_symtree (ns->sym_root, sym->name);
3385 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3386 goto fixup_contained;
3388 old_sym = st->n.sym;
3389 if (old_sym->ns == ns
3390 && !old_sym->attr.contained
3392 /* By 14.6.1.3, host association should be excluded
3393 for the following. */
3394 && !(old_sym->attr.external
3395 || (old_sym->ts.type != BT_UNKNOWN
3396 && !old_sym->attr.implicit_type)
3397 || old_sym->attr.flavor == FL_PARAMETER
3398 || old_sym->attr.in_common
3399 || old_sym->attr.in_equivalence
3400 || old_sym->attr.data
3401 || old_sym->attr.dummy
3402 || old_sym->attr.result
3403 || old_sym->attr.dimension
3404 || old_sym->attr.allocatable
3405 || old_sym->attr.intrinsic
3406 || old_sym->attr.generic
3407 || old_sym->attr.flavor == FL_NAMELIST
3408 || old_sym->attr.proc == PROC_ST_FUNCTION))
3410 /* Replace it with the symbol from the parent namespace. */
3414 /* Free the old (local) symbol. */
3416 if (old_sym->refs == 0)
3417 gfc_free_symbol (old_sym);
3421 /* Do the same for any contained procedures. */
3422 gfc_fixup_sibling_symbols (sym, ns->contained);
3427 parse_contained (int module)
3429 gfc_namespace *ns, *parent_ns, *tmp;
3430 gfc_state_data s1, s2;
3434 int contains_statements = 0;
3437 push_state (&s1, COMP_CONTAINS, NULL);
3438 parent_ns = gfc_current_ns;
3442 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3444 gfc_current_ns->sibling = parent_ns->contained;
3445 parent_ns->contained = gfc_current_ns;
3448 /* Process the next available statement. We come here if we got an error
3449 and rejected the last statement. */
3450 st = next_statement ();
3459 contains_statements = 1;
3460 accept_statement (st);
3463 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3466 /* For internal procedures, create/update the symbol in the
3467 parent namespace. */
3471 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3472 gfc_error ("Contained procedure '%s' at %C is already "
3473 "ambiguous", gfc_new_block->name);
3476 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3477 &gfc_new_block->declared_at) ==
3480 if (st == ST_FUNCTION)
3481 gfc_add_function (&sym->attr, sym->name,
3482 &gfc_new_block->declared_at);
3484 gfc_add_subroutine (&sym->attr, sym->name,
3485 &gfc_new_block->declared_at);
3489 gfc_commit_symbols ();
3492 sym = gfc_new_block;
3494 /* Mark this as a contained function, so it isn't replaced
3495 by other module functions. */
3496 sym->attr.contained = 1;
3497 sym->attr.referenced = 1;
3499 parse_progunit (ST_NONE);
3501 /* Fix up any sibling functions that refer to this one. */
3502 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3503 /* Or refer to any of its alternate entry points. */
3504 for (el = gfc_current_ns->entries; el; el = el->next)
3505 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3507 gfc_current_ns->code = s2.head;
3508 gfc_current_ns = parent_ns;
3513 /* These statements are associated with the end of the host unit. */
3514 case ST_END_FUNCTION:
3516 case ST_END_PROGRAM:
3517 case ST_END_SUBROUTINE:
3518 accept_statement (st);
3522 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3523 gfc_ascii_statement (st));
3524 reject_statement ();
3530 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3531 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3533 /* The first namespace in the list is guaranteed to not have
3534 anything (worthwhile) in it. */
3535 tmp = gfc_current_ns;
3536 gfc_current_ns = parent_ns;
3537 if (seen_error && tmp->refs > 1)
3538 gfc_free_namespace (tmp);
3540 ns = gfc_current_ns->contained;
3541 gfc_current_ns->contained = ns->sibling;
3542 gfc_free_namespace (ns);
3545 if (!contains_statements)
3546 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3547 "FUNCTION or SUBROUTINE statement at %C");
3551 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3554 parse_progunit (gfc_statement st)
3559 st = parse_spec (st);
3569 accept_statement (st);
3576 if (gfc_current_state () == COMP_FUNCTION)
3577 gfc_check_function_type (gfc_current_ns);
3582 st = parse_executable (st);
3593 accept_statement (st);
3600 unexpected_statement (st);
3601 reject_statement ();
3602 st = next_statement ();
3608 for (p = gfc_state_stack; p; p = p->previous)
3609 if (p->state == COMP_CONTAINS)
3612 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3617 gfc_error ("CONTAINS statement at %C is already in a contained "
3619 st = next_statement ();
3623 parse_contained (0);
3626 gfc_current_ns->code = gfc_state_stack->head;
3630 /* Come here to complain about a global symbol already in use as
3634 gfc_global_used (gfc_gsymbol *sym, locus *where)
3639 where = &gfc_current_locus;
3649 case GSYM_SUBROUTINE:
3650 name = "SUBROUTINE";
3655 case GSYM_BLOCK_DATA:
3656 name = "BLOCK DATA";
3662 gfc_internal_error ("gfc_global_used(): Bad type");
3666 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3667 sym->name, where, name, &sym->where);
3671 /* Parse a block data program unit. */
3674 parse_block_data (void)
3677 static locus blank_locus;
3678 static int blank_block=0;
3681 gfc_current_ns->proc_name = gfc_new_block;
3682 gfc_current_ns->is_block_data = 1;
3684 if (gfc_new_block == NULL)
3687 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3688 "prior BLOCK DATA at %L", &blank_locus);
3692 blank_locus = gfc_current_locus;
3697 s = gfc_get_gsymbol (gfc_new_block->name);
3699 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3700 gfc_global_used(s, NULL);
3703 s->type = GSYM_BLOCK_DATA;
3704 s->where = gfc_current_locus;
3709 st = parse_spec (ST_NONE);
3711 while (st != ST_END_BLOCK_DATA)
3713 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3714 gfc_ascii_statement (st));
3715 reject_statement ();
3716 st = next_statement ();
3721 /* Parse a module subprogram. */
3729 s = gfc_get_gsymbol (gfc_new_block->name);
3730 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3731 gfc_global_used(s, NULL);
3734 s->type = GSYM_MODULE;
3735 s->where = gfc_current_locus;
3739 st = parse_spec (ST_NONE);
3748 parse_contained (1);
3752 accept_statement (st);
3756 gfc_error ("Unexpected %s statement in MODULE at %C",
3757 gfc_ascii_statement (st));
3759 reject_statement ();
3760 st = next_statement ();
3764 s->ns = gfc_current_ns;
3768 /* Add a procedure name to the global symbol table. */
3771 add_global_procedure (int sub)
3775 s = gfc_get_gsymbol(gfc_new_block->name);
3778 || (s->type != GSYM_UNKNOWN
3779 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3780 gfc_global_used(s, NULL);
3783 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3784 s->where = gfc_current_locus;
3786 s->ns = gfc_current_ns;
3791 /* Add a program to the global symbol table. */
3794 add_global_program (void)
3798 if (gfc_new_block == NULL)
3800 s = gfc_get_gsymbol (gfc_new_block->name);
3802 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3803 gfc_global_used(s, NULL);
3806 s->type = GSYM_PROGRAM;
3807 s->where = gfc_current_locus;
3809 s->ns = gfc_current_ns;
3814 /* Resolve all the program units when whole file scope option
3817 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
3819 gfc_free_dt_list ();
3820 gfc_current_ns = gfc_global_ns_list;
3821 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3823 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3824 gfc_resolve (gfc_current_ns);
3825 gfc_current_ns->derived_types = gfc_derived_types;
3826 gfc_derived_types = NULL;
3832 clean_up_modules (gfc_gsymbol *gsym)
3837 clean_up_modules (gsym->left);
3838 clean_up_modules (gsym->right);
3840 if (gsym->type != GSYM_MODULE || !gsym->ns)
3843 gfc_current_ns = gsym->ns;
3844 gfc_derived_types = gfc_current_ns->derived_types;
3851 /* Translate all the program units when whole file scope option
3852 is active. This could be in a different order to resolution if
3853 there are forward references in the file. */
3855 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
3859 gfc_current_ns = gfc_global_ns_list;
3860 gfc_get_errors (NULL, &errors);
3862 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3864 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3865 gfc_derived_types = gfc_current_ns->derived_types;
3866 gfc_generate_code (gfc_current_ns);
3867 gfc_current_ns->translated = 1;
3870 /* Clean up all the namespaces after translation. */
3871 gfc_current_ns = gfc_global_ns_list;
3872 for (;gfc_current_ns;)
3874 gfc_namespace *ns = gfc_current_ns->sibling;
3875 gfc_derived_types = gfc_current_ns->derived_types;
3877 gfc_current_ns = ns;
3880 clean_up_modules (gfc_gsym_root);
3884 /* Top level parser. */
3887 gfc_parse_file (void)
3889 int seen_program, errors_before, errors;
3890 gfc_state_data top, s;
3893 gfc_namespace *next;
3895 gfc_start_source_files ();
3897 top.state = COMP_NONE;
3899 top.previous = NULL;
3900 top.head = top.tail = NULL;
3901 top.do_variable = NULL;
3903 gfc_state_stack = ⊤
3905 gfc_clear_new_st ();
3907 gfc_statement_label = NULL;
3909 if (setjmp (eof_buf))
3910 return FAILURE; /* Come here on unexpected EOF */
3912 /* Prepare the global namespace that will contain the
3914 gfc_global_ns_list = next = NULL;
3918 /* Exit early for empty files. */
3924 st = next_statement ();
3933 goto duplicate_main;
3935 prog_locus = gfc_current_locus;
3937 push_state (&s, COMP_PROGRAM, gfc_new_block);
3938 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3939 accept_statement (st);
3940 add_global_program ();
3941 parse_progunit (ST_NONE);
3942 if (gfc_option.flag_whole_file)
3947 add_global_procedure (1);
3948 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3949 accept_statement (st);
3950 parse_progunit (ST_NONE);
3951 if (gfc_option.flag_whole_file)
3956 add_global_procedure (0);
3957 push_state (&s, COMP_FUNCTION, gfc_new_block);
3958 accept_statement (st);
3959 parse_progunit (ST_NONE);
3960 if (gfc_option.flag_whole_file)
3965 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3966 accept_statement (st);
3967 parse_block_data ();
3971 push_state (&s, COMP_MODULE, gfc_new_block);
3972 accept_statement (st);
3974 gfc_get_errors (NULL, &errors_before);
3978 /* Anything else starts a nameless main program block. */
3981 goto duplicate_main;
3983 prog_locus = gfc_current_locus;
3985 push_state (&s, COMP_PROGRAM, gfc_new_block);
3986 main_program_symbol (gfc_current_ns, "MAIN__");
3987 parse_progunit (st);
3988 if (gfc_option.flag_whole_file)
3993 /* Handle the non-program units. */
3994 gfc_current_ns->code = s.head;
3996 gfc_resolve (gfc_current_ns);
3998 /* Dump the parse tree if requested. */
3999 if (gfc_option.dump_parse_tree)
4000 gfc_dump_parse_tree (gfc_current_ns, stdout);
4002 gfc_get_errors (NULL, &errors);
4003 if (s.state == COMP_MODULE)
4005 gfc_dump_module (s.sym->name, errors_before == errors);
4007 gfc_generate_module_code (gfc_current_ns);
4009 if (!gfc_option.flag_whole_file)
4013 gfc_current_ns->derived_types = gfc_derived_types;
4014 gfc_derived_types = NULL;
4015 gfc_current_ns = NULL;
4021 gfc_generate_code (gfc_current_ns);
4029 /* The main program and non-contained procedures are put
4030 in the global namespace list, so that they can be processed
4031 later and all their interfaces resolved. */
4032 gfc_current_ns->code = s.head;
4034 next->sibling = gfc_current_ns;
4036 gfc_global_ns_list = gfc_current_ns;
4038 next = gfc_current_ns;
4045 if (!gfc_option.flag_whole_file)
4048 /* Do the resolution. */
4049 resolve_all_program_units (gfc_global_ns_list);
4051 /* Do the parse tree dump. */
4053 = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
4055 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4057 gfc_dump_parse_tree (gfc_current_ns, stdout);
4058 fputs ("------------------------------------------\n\n", stdout);
4061 /* Do the translation. */
4062 translate_all_program_units (gfc_global_ns_list);
4066 gfc_end_source_files ();
4070 /* If we see a duplicate main program, shut down. If the second
4071 instance is an implied main program, i.e. data decls or executable
4072 statements, we're in for lots of errors. */
4073 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4074 reject_statement ();