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 "
658 "at %L", &label_locus);
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_now ("Ignoring statement label in empty statement at %L",
854 gfc_current_locus.lb->truncated = 0;
860 /* Return the next non-ST_NONE statement to the caller. We also worry
861 about including files and the ends of include files at this stage. */
864 next_statement (void)
869 gfc_new_block = NULL;
871 gfc_current_ns->old_cl_list = gfc_current_ns->cl_list;
874 gfc_statement_label = NULL;
875 gfc_buffer_error (1);
880 gfc_skip_comments ();
888 if (gfc_define_undef_line ())
891 old_locus = gfc_current_locus;
893 st = (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
899 gfc_buffer_error (0);
901 if (st == ST_GET_FCN_CHARACTERISTICS && gfc_statement_label != NULL)
903 gfc_free_st_label (gfc_statement_label);
904 gfc_statement_label = NULL;
905 gfc_current_locus = old_locus;
909 check_statement_label (st);
915 /****************************** Parser ***********************************/
917 /* The parser subroutines are of type 'try' that fail if the file ends
920 /* Macros that expand to case-labels for various classes of
921 statements. Start with executable statements that directly do
924 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
925 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
926 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
927 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
928 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
929 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
930 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
931 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
932 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
934 /* Statements that mark other executable statements. */
936 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
937 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
938 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
939 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
940 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
941 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
944 /* Declaration statements */
946 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
947 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
948 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
951 /* Block end statements. Errors associated with interchanging these
952 are detected in gfc_match_end(). */
954 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
955 case ST_END_PROGRAM: case ST_END_SUBROUTINE
958 /* Push a new state onto the stack. */
961 push_state (gfc_state_data *p, gfc_compile_state new_state, gfc_symbol *sym)
963 p->state = new_state;
964 p->previous = gfc_state_stack;
966 p->head = p->tail = NULL;
967 p->do_variable = NULL;
972 /* Pop the current state. */
976 gfc_state_stack = gfc_state_stack->previous;
980 /* Try to find the given state in the state stack. */
983 gfc_find_state (gfc_compile_state state)
987 for (p = gfc_state_stack; p; p = p->previous)
988 if (p->state == state)
991 return (p == NULL) ? FAILURE : SUCCESS;
995 /* Starts a new level in the statement list. */
998 new_level (gfc_code *q)
1002 p = q->block = gfc_get_code ();
1004 gfc_state_stack->head = gfc_state_stack->tail = p;
1010 /* Add the current new_st code structure and adds it to the current
1011 program unit. As a side-effect, it zeroes the new_st. */
1014 add_statement (void)
1018 p = gfc_get_code ();
1021 p->loc = gfc_current_locus;
1023 if (gfc_state_stack->head == NULL)
1024 gfc_state_stack->head = p;
1026 gfc_state_stack->tail->next = p;
1028 while (p->next != NULL)
1031 gfc_state_stack->tail = p;
1033 gfc_clear_new_st ();
1039 /* Frees everything associated with the current statement. */
1042 undo_new_statement (void)
1044 gfc_free_statements (new_st.block);
1045 gfc_free_statements (new_st.next);
1046 gfc_free_statement (&new_st);
1047 gfc_clear_new_st ();
1051 /* If the current statement has a statement label, make sure that it
1052 is allowed to, or should have one. */
1055 check_statement_label (gfc_statement st)
1059 if (gfc_statement_label == NULL)
1061 if (st == ST_FORMAT)
1062 gfc_error ("FORMAT statement at %L does not have a statement label",
1069 case ST_END_PROGRAM:
1070 case ST_END_FUNCTION:
1071 case ST_END_SUBROUTINE:
1077 type = ST_LABEL_TARGET;
1081 type = ST_LABEL_FORMAT;
1084 /* Statement labels are not restricted from appearing on a
1085 particular line. However, there are plenty of situations
1086 where the resulting label can't be referenced. */
1089 type = ST_LABEL_BAD_TARGET;
1093 gfc_define_st_label (gfc_statement_label, type, &label_locus);
1095 new_st.here = gfc_statement_label;
1099 /* Figures out what the enclosing program unit is. This will be a
1100 function, subroutine, program, block data or module. */
1103 gfc_enclosing_unit (gfc_compile_state * result)
1107 for (p = gfc_state_stack; p; p = p->previous)
1108 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
1109 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
1110 || p->state == COMP_PROGRAM)
1119 *result = COMP_PROGRAM;
1124 /* Translate a statement enum to a string. */
1127 gfc_ascii_statement (gfc_statement st)
1133 case ST_ARITHMETIC_IF:
1134 p = _("arithmetic IF");
1140 p = _("attribute declaration");
1170 p = _("data declaration");
1178 case ST_DERIVED_DECL:
1179 p = _("derived type declaration");
1193 case ST_END_BLOCK_DATA:
1194 p = "END BLOCK DATA";
1205 case ST_END_FUNCTION:
1211 case ST_END_INTERFACE:
1212 p = "END INTERFACE";
1217 case ST_END_PROGRAM:
1223 case ST_END_SUBROUTINE:
1224 p = "END SUBROUTINE";
1235 case ST_EQUIVALENCE:
1244 case ST_FORALL_BLOCK: /* Fall through */
1266 case ST_IMPLICIT_NONE:
1267 p = "IMPLICIT NONE";
1269 case ST_IMPLIED_ENDDO:
1270 p = _("implied END DO");
1296 case ST_MODULE_PROC:
1297 p = "MODULE PROCEDURE";
1335 case ST_WHERE_BLOCK: /* Fall through */
1346 p = _("assignment");
1348 case ST_POINTER_ASSIGNMENT:
1349 p = _("pointer assignment");
1351 case ST_SELECT_CASE:
1360 case ST_STATEMENT_FUNCTION:
1361 p = "STATEMENT FUNCTION";
1363 case ST_LABEL_ASSIGNMENT:
1364 p = "LABEL ASSIGNMENT";
1367 p = "ENUM DEFINITION";
1370 p = "ENUMERATOR DEFINITION";
1378 case ST_OMP_BARRIER:
1379 p = "!$OMP BARRIER";
1381 case ST_OMP_CRITICAL:
1382 p = "!$OMP CRITICAL";
1387 case ST_OMP_END_CRITICAL:
1388 p = "!$OMP END CRITICAL";
1393 case ST_OMP_END_MASTER:
1394 p = "!$OMP END MASTER";
1396 case ST_OMP_END_ORDERED:
1397 p = "!$OMP END ORDERED";
1399 case ST_OMP_END_PARALLEL:
1400 p = "!$OMP END PARALLEL";
1402 case ST_OMP_END_PARALLEL_DO:
1403 p = "!$OMP END PARALLEL DO";
1405 case ST_OMP_END_PARALLEL_SECTIONS:
1406 p = "!$OMP END PARALLEL SECTIONS";
1408 case ST_OMP_END_PARALLEL_WORKSHARE:
1409 p = "!$OMP END PARALLEL WORKSHARE";
1411 case ST_OMP_END_SECTIONS:
1412 p = "!$OMP END SECTIONS";
1414 case ST_OMP_END_SINGLE:
1415 p = "!$OMP END SINGLE";
1417 case ST_OMP_END_TASK:
1418 p = "!$OMP END TASK";
1420 case ST_OMP_END_WORKSHARE:
1421 p = "!$OMP END WORKSHARE";
1429 case ST_OMP_ORDERED:
1430 p = "!$OMP ORDERED";
1432 case ST_OMP_PARALLEL:
1433 p = "!$OMP PARALLEL";
1435 case ST_OMP_PARALLEL_DO:
1436 p = "!$OMP PARALLEL DO";
1438 case ST_OMP_PARALLEL_SECTIONS:
1439 p = "!$OMP PARALLEL SECTIONS";
1441 case ST_OMP_PARALLEL_WORKSHARE:
1442 p = "!$OMP PARALLEL WORKSHARE";
1444 case ST_OMP_SECTIONS:
1445 p = "!$OMP SECTIONS";
1447 case ST_OMP_SECTION:
1448 p = "!$OMP SECTION";
1456 case ST_OMP_TASKWAIT:
1457 p = "!$OMP TASKWAIT";
1459 case ST_OMP_THREADPRIVATE:
1460 p = "!$OMP THREADPRIVATE";
1462 case ST_OMP_WORKSHARE:
1463 p = "!$OMP WORKSHARE";
1466 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1473 /* Create a symbol for the main program and assign it to ns->proc_name. */
1476 main_program_symbol (gfc_namespace *ns, const char *name)
1478 gfc_symbol *main_program;
1479 symbol_attribute attr;
1481 gfc_get_symbol (name, ns, &main_program);
1482 gfc_clear_attr (&attr);
1483 attr.flavor = FL_PROGRAM;
1484 attr.proc = PROC_UNKNOWN;
1485 attr.subroutine = 1;
1486 attr.access = ACCESS_PUBLIC;
1487 attr.is_main_program = 1;
1488 main_program->attr = attr;
1489 main_program->declared_at = gfc_current_locus;
1490 ns->proc_name = main_program;
1491 gfc_commit_symbols ();
1495 /* Do whatever is necessary to accept the last statement. */
1498 accept_statement (gfc_statement st)
1506 case ST_IMPLICIT_NONE:
1507 gfc_set_implicit_none ();
1516 gfc_current_ns->proc_name = gfc_new_block;
1519 /* If the statement is the end of a block, lay down a special code
1520 that allows a branch to the end of the block from within the
1521 construct. IF and SELECT are treated differently from DO
1522 (where EXEC_NOP is added inside the loop) for two
1524 1. END DO has a meaning in the sense that after a GOTO to
1525 it, the loop counter must be increased.
1526 2. IF blocks and SELECT blocks can consist of multiple
1527 parallel blocks (IF ... ELSE IF ... ELSE ... END IF).
1528 Putting the label before the END IF would make the jump
1529 from, say, the ELSE IF block to the END IF illegal. */
1533 if (gfc_statement_label != NULL)
1535 new_st.op = EXEC_END_BLOCK;
1540 /* The end-of-program unit statements do not get the special
1541 marker and require a statement of some sort if they are a
1544 case ST_END_PROGRAM:
1545 case ST_END_FUNCTION:
1546 case ST_END_SUBROUTINE:
1547 if (gfc_statement_label != NULL)
1549 new_st.op = EXEC_RETURN;
1554 new_st.op = EXEC_END_PROCEDURE;
1570 gfc_commit_symbols ();
1571 gfc_warning_check ();
1572 gfc_clear_new_st ();
1576 /* Undo anything tentative that has been built for the current
1580 reject_statement (void)
1582 /* Revert to the previous charlen chain. */
1583 gfc_free_charlen (gfc_current_ns->cl_list, gfc_current_ns->old_cl_list);
1584 gfc_current_ns->cl_list = gfc_current_ns->old_cl_list;
1586 gfc_new_block = NULL;
1587 gfc_undo_symbols ();
1588 gfc_clear_warning ();
1589 undo_new_statement ();
1593 /* Generic complaint about an out of order statement. We also do
1594 whatever is necessary to clean up. */
1597 unexpected_statement (gfc_statement st)
1599 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1601 reject_statement ();
1605 /* Given the next statement seen by the matcher, make sure that it is
1606 in proper order with the last. This subroutine is initialized by
1607 calling it with an argument of ST_NONE. If there is a problem, we
1608 issue an error and return FAILURE. Otherwise we return SUCCESS.
1610 Individual parsers need to verify that the statements seen are
1611 valid before calling here, i.e., ENTRY statements are not allowed in
1612 INTERFACE blocks. The following diagram is taken from the standard:
1614 +---------------------------------------+
1615 | program subroutine function module |
1616 +---------------------------------------+
1618 +---------------------------------------+
1620 +---------------------------------------+
1622 | +-----------+------------------+
1623 | | parameter | implicit |
1624 | +-----------+------------------+
1625 | format | | derived type |
1626 | entry | parameter | interface |
1627 | | data | specification |
1628 | | | statement func |
1629 | +-----------+------------------+
1630 | | data | executable |
1631 +--------+-----------+------------------+
1633 +---------------------------------------+
1634 | internal module/subprogram |
1635 +---------------------------------------+
1637 +---------------------------------------+
1646 ORDER_IMPLICIT_NONE,
1654 enum state_order state;
1655 gfc_statement last_statement;
1661 verify_st_order (st_state *p, gfc_statement st, bool silent)
1667 p->state = ORDER_START;
1671 if (p->state > ORDER_USE)
1673 p->state = ORDER_USE;
1677 if (p->state > ORDER_IMPORT)
1679 p->state = ORDER_IMPORT;
1682 case ST_IMPLICIT_NONE:
1683 if (p->state > ORDER_IMPLICIT_NONE)
1686 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1687 statement disqualifies a USE but not an IMPLICIT NONE.
1688 Duplicate IMPLICIT NONEs are caught when the implicit types
1691 p->state = ORDER_IMPLICIT_NONE;
1695 if (p->state > ORDER_IMPLICIT)
1697 p->state = ORDER_IMPLICIT;
1702 if (p->state < ORDER_IMPLICIT_NONE)
1703 p->state = ORDER_IMPLICIT_NONE;
1707 if (p->state >= ORDER_EXEC)
1709 if (p->state < ORDER_IMPLICIT)
1710 p->state = ORDER_IMPLICIT;
1714 if (p->state < ORDER_SPEC)
1715 p->state = ORDER_SPEC;
1720 case ST_DERIVED_DECL:
1722 if (p->state >= ORDER_EXEC)
1724 if (p->state < ORDER_SPEC)
1725 p->state = ORDER_SPEC;
1730 if (p->state < ORDER_EXEC)
1731 p->state = ORDER_EXEC;
1735 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1736 gfc_ascii_statement (st));
1739 /* All is well, record the statement in case we need it next time. */
1740 p->where = gfc_current_locus;
1741 p->last_statement = st;
1746 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1747 gfc_ascii_statement (st),
1748 gfc_ascii_statement (p->last_statement), &p->where);
1754 /* Handle an unexpected end of file. This is a show-stopper... */
1756 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1759 unexpected_eof (void)
1763 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1765 /* Memory cleanup. Move to "second to last". */
1766 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1769 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1772 longjmp (eof_buf, 1);
1776 /* Parse the CONTAINS section of a derived type definition. */
1778 gfc_access gfc_typebound_default_access;
1781 parse_derived_contains (void)
1784 bool seen_private = false;
1785 bool seen_comps = false;
1786 bool error_flag = false;
1789 gcc_assert (gfc_current_state () == COMP_DERIVED);
1790 gcc_assert (gfc_current_block ());
1792 /* Derived-types with SEQUENCE and/or BIND(C) must not have a CONTAINS
1794 if (gfc_current_block ()->attr.sequence)
1795 gfc_error ("Derived-type '%s' with SEQUENCE must not have a CONTAINS"
1796 " section at %C", gfc_current_block ()->name);
1797 if (gfc_current_block ()->attr.is_bind_c)
1798 gfc_error ("Derived-type '%s' with BIND(C) must not have a CONTAINS"
1799 " section at %C", gfc_current_block ()->name);
1801 accept_statement (ST_CONTAINS);
1802 push_state (&s, COMP_DERIVED_CONTAINS, NULL);
1804 gfc_typebound_default_access = ACCESS_PUBLIC;
1810 st = next_statement ();
1818 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1823 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Type-bound"
1824 " procedure at %C") == FAILURE)
1827 accept_statement (ST_PROCEDURE);
1832 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: GENERIC binding"
1833 " at %C") == FAILURE)
1836 accept_statement (ST_GENERIC);
1841 if (gfc_notify_std (GFC_STD_F2003,
1842 "Fortran 2003: FINAL procedure declaration"
1843 " at %C") == FAILURE)
1846 accept_statement (ST_FINAL);
1854 && (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: Derived type "
1855 "definition at %C with empty CONTAINS "
1856 "section") == FAILURE))
1859 /* ST_END_TYPE is accepted by parse_derived after return. */
1863 if (gfc_find_state (COMP_MODULE) == FAILURE)
1865 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1873 gfc_error ("PRIVATE statement at %C must precede procedure"
1881 gfc_error ("Duplicate PRIVATE statement at %C");
1885 accept_statement (ST_PRIVATE);
1886 gfc_typebound_default_access = ACCESS_PRIVATE;
1887 seen_private = true;
1891 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1896 gfc_error ("Already inside a CONTAINS block at %C");
1901 unexpected_statement (st);
1907 gcc_assert (gfc_current_state () == COMP_DERIVED);
1913 /* Parse a derived type. */
1916 parse_derived (void)
1918 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1921 gfc_symbol *derived_sym = NULL;
1927 accept_statement (ST_DERIVED_DECL);
1928 push_state (&s, COMP_DERIVED, gfc_new_block);
1930 gfc_new_block->component_access = ACCESS_PUBLIC;
1937 while (compiling_type)
1939 st = next_statement ();
1947 accept_statement (st);
1952 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1961 && (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Derived type "
1962 "definition at %C without components")
1966 accept_statement (ST_END_TYPE);
1970 if (gfc_find_state (COMP_MODULE) == FAILURE)
1972 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1980 gfc_error ("PRIVATE statement at %C must precede "
1981 "structure components");
1988 gfc_error ("Duplicate PRIVATE statement at %C");
1992 s.sym->component_access = ACCESS_PRIVATE;
1994 accept_statement (ST_PRIVATE);
2001 gfc_error ("SEQUENCE statement at %C must precede "
2002 "structure components");
2007 if (gfc_current_block ()->attr.sequence)
2008 gfc_warning ("SEQUENCE attribute at %C already specified in "
2013 gfc_error ("Duplicate SEQUENCE statement at %C");
2018 gfc_add_sequence (&gfc_current_block ()->attr,
2019 gfc_current_block ()->name, NULL);
2023 if (gfc_notify_std (GFC_STD_F2003,
2024 "Fortran 2003: CONTAINS block in derived type"
2025 " definition at %C") == FAILURE)
2028 accept_statement (ST_CONTAINS);
2029 if (parse_derived_contains ())
2034 unexpected_statement (st);
2039 /* need to verify that all fields of the derived type are
2040 * interoperable with C if the type is declared to be bind(c)
2042 derived_sym = gfc_current_block();
2044 sym = gfc_current_block ();
2045 for (c = sym->components; c; c = c->next)
2047 /* Look for allocatable components. */
2048 if (c->attr.allocatable
2049 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.alloc_comp))
2050 sym->attr.alloc_comp = 1;
2052 /* Look for pointer components. */
2054 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.pointer_comp))
2055 sym->attr.pointer_comp = 1;
2057 /* Look for procedure pointer components. */
2058 if (c->attr.proc_pointer
2059 || (c->ts.type == BT_DERIVED
2060 && c->ts.u.derived->attr.proc_pointer_comp))
2061 sym->attr.proc_pointer_comp = 1;
2063 /* Look for private components. */
2064 if (sym->component_access == ACCESS_PRIVATE
2065 || c->attr.access == ACCESS_PRIVATE
2066 || (c->ts.type == BT_DERIVED && c->ts.u.derived->attr.private_comp))
2067 sym->attr.private_comp = 1;
2070 if (!seen_component)
2071 sym->attr.zero_comp = 1;
2077 /* Parse an ENUM. */
2086 int seen_enumerator = 0;
2090 push_state (&s, COMP_ENUM, gfc_new_block);
2094 while (compiling_enum)
2096 st = next_statement ();
2104 seen_enumerator = 1;
2105 accept_statement (st);
2110 if (!seen_enumerator)
2112 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
2115 accept_statement (st);
2119 gfc_free_enum_history ();
2120 unexpected_statement (st);
2128 /* Parse an interface. We must be able to deal with the possibility
2129 of recursive interfaces. The parse_spec() subroutine is mutually
2130 recursive with parse_interface(). */
2132 static gfc_statement parse_spec (gfc_statement);
2135 parse_interface (void)
2137 gfc_compile_state new_state = COMP_NONE, current_state;
2138 gfc_symbol *prog_unit, *sym;
2139 gfc_interface_info save;
2140 gfc_state_data s1, s2;
2144 accept_statement (ST_INTERFACE);
2146 current_interface.ns = gfc_current_ns;
2147 save = current_interface;
2149 sym = (current_interface.type == INTERFACE_GENERIC
2150 || current_interface.type == INTERFACE_USER_OP)
2151 ? gfc_new_block : NULL;
2153 push_state (&s1, COMP_INTERFACE, sym);
2154 current_state = COMP_NONE;
2157 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
2159 st = next_statement ();
2167 if (st == ST_SUBROUTINE)
2168 new_state = COMP_SUBROUTINE;
2169 else if (st == ST_FUNCTION)
2170 new_state = COMP_FUNCTION;
2171 if (gfc_new_block->attr.pointer)
2173 gfc_new_block->attr.pointer = 0;
2174 gfc_new_block->attr.proc_pointer = 1;
2176 if (gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
2177 gfc_new_block->formal, NULL) == FAILURE)
2179 reject_statement ();
2180 gfc_free_namespace (gfc_current_ns);
2186 case ST_MODULE_PROC: /* The module procedure matcher makes
2187 sure the context is correct. */
2188 accept_statement (st);
2189 gfc_free_namespace (gfc_current_ns);
2192 case ST_END_INTERFACE:
2193 gfc_free_namespace (gfc_current_ns);
2194 gfc_current_ns = current_interface.ns;
2198 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2199 gfc_ascii_statement (st));
2200 reject_statement ();
2201 gfc_free_namespace (gfc_current_ns);
2206 /* Make sure that a generic interface has only subroutines or
2207 functions and that the generic name has the right attribute. */
2208 if (current_interface.type == INTERFACE_GENERIC)
2210 if (current_state == COMP_NONE)
2212 if (new_state == COMP_FUNCTION)
2213 gfc_add_function (&sym->attr, sym->name, NULL);
2214 else if (new_state == COMP_SUBROUTINE)
2215 gfc_add_subroutine (&sym->attr, sym->name, NULL);
2217 current_state = new_state;
2221 if (new_state != current_state)
2223 if (new_state == COMP_SUBROUTINE)
2224 gfc_error ("SUBROUTINE at %C does not belong in a "
2225 "generic function interface");
2227 if (new_state == COMP_FUNCTION)
2228 gfc_error ("FUNCTION at %C does not belong in a "
2229 "generic subroutine interface");
2234 if (current_interface.type == INTERFACE_ABSTRACT)
2236 gfc_add_abstract (&gfc_new_block->attr, &gfc_current_locus);
2237 if (gfc_is_intrinsic_typename (gfc_new_block->name))
2238 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2239 "cannot be the same as an intrinsic type",
2240 gfc_new_block->name);
2243 push_state (&s2, new_state, gfc_new_block);
2244 accept_statement (st);
2245 prog_unit = gfc_new_block;
2246 prog_unit->formal_ns = gfc_current_ns;
2247 proc_locus = gfc_current_locus;
2250 /* Read data declaration statements. */
2251 st = parse_spec (ST_NONE);
2253 /* Since the interface block does not permit an IMPLICIT statement,
2254 the default type for the function or the result must be taken
2255 from the formal namespace. */
2256 if (new_state == COMP_FUNCTION)
2258 if (prog_unit->result == prog_unit
2259 && prog_unit->ts.type == BT_UNKNOWN)
2260 gfc_set_default_type (prog_unit, 1, prog_unit->formal_ns);
2261 else if (prog_unit->result != prog_unit
2262 && prog_unit->result->ts.type == BT_UNKNOWN)
2263 gfc_set_default_type (prog_unit->result, 1,
2264 prog_unit->formal_ns);
2267 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
2269 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2270 gfc_ascii_statement (st));
2271 reject_statement ();
2275 /* Add EXTERNAL attribute to function or subroutine. */
2276 if (current_interface.type != INTERFACE_ABSTRACT && !prog_unit->attr.dummy)
2277 gfc_add_external (&prog_unit->attr, &gfc_current_locus);
2279 current_interface = save;
2280 gfc_add_interface (prog_unit);
2283 if (current_interface.ns
2284 && current_interface.ns->proc_name
2285 && strcmp (current_interface.ns->proc_name->name,
2286 prog_unit->name) == 0)
2287 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2288 "enclosing procedure", prog_unit->name, &proc_locus);
2297 /* Associate function characteristics by going back to the function
2298 declaration and rematching the prefix. */
2301 match_deferred_characteristics (gfc_typespec * ts)
2304 match m = MATCH_ERROR;
2305 char name[GFC_MAX_SYMBOL_LEN + 1];
2307 loc = gfc_current_locus;
2309 gfc_current_locus = gfc_current_block ()->declared_at;
2312 gfc_buffer_error (1);
2313 m = gfc_match_prefix (ts);
2314 gfc_buffer_error (0);
2316 if (ts->type == BT_DERIVED)
2320 if (!ts->u.derived || !ts->u.derived->components)
2324 /* Only permit one go at the characteristic association. */
2328 /* Set the function locus correctly. If we have not found the
2329 function name, there is an error. */
2331 && gfc_match ("function% %n", name) == MATCH_YES
2332 && strcmp (name, gfc_current_block ()->name) == 0)
2334 gfc_current_block ()->declared_at = gfc_current_locus;
2335 gfc_commit_symbols ();
2340 gfc_current_locus =loc;
2345 /* Check specification-expressions in the function result of the currently
2346 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2347 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2348 scope are not yet parsed so this has to be delayed up to parse_spec. */
2351 check_function_result_typed (void)
2353 gfc_typespec* ts = &gfc_current_ns->proc_name->result->ts;
2355 gcc_assert (gfc_current_state () == COMP_FUNCTION);
2356 gcc_assert (ts->type != BT_UNKNOWN);
2358 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2359 /* TODO: Extend when KIND type parameters are implemented. */
2360 if (ts->type == BT_CHARACTER && ts->u.cl && ts->u.cl->length)
2361 gfc_expr_check_typed (ts->u.cl->length, gfc_current_ns, true);
2365 /* Parse a set of specification statements. Returns the statement
2366 that doesn't fit. */
2368 static gfc_statement
2369 parse_spec (gfc_statement st)
2372 bool function_result_typed = false;
2373 bool bad_characteristic = false;
2376 verify_st_order (&ss, ST_NONE, false);
2378 st = next_statement ();
2380 /* If we are not inside a function or don't have a result specified so far,
2381 do nothing special about it. */
2382 if (gfc_current_state () != COMP_FUNCTION)
2383 function_result_typed = true;
2386 gfc_symbol* proc = gfc_current_ns->proc_name;
2389 if (proc->result->ts.type == BT_UNKNOWN)
2390 function_result_typed = true;
2395 /* If we find a statement that can not be followed by an IMPLICIT statement
2396 (and thus we can expect to see none any further), type the function result
2397 if it has not yet been typed. Be careful not to give the END statement
2398 to verify_st_order! */
2399 if (!function_result_typed && st != ST_GET_FCN_CHARACTERISTICS)
2401 bool verify_now = false;
2403 if (st == ST_END_FUNCTION || st == ST_CONTAINS)
2408 verify_st_order (&dummyss, ST_NONE, false);
2409 verify_st_order (&dummyss, st, false);
2411 if (verify_st_order (&dummyss, ST_IMPLICIT, true) == FAILURE)
2417 check_function_result_typed ();
2418 function_result_typed = true;
2427 case ST_IMPLICIT_NONE:
2429 if (!function_result_typed)
2431 check_function_result_typed ();
2432 function_result_typed = true;
2438 case ST_DATA: /* Not allowed in interfaces */
2439 if (gfc_current_state () == COMP_INTERFACE)
2449 case ST_DERIVED_DECL:
2452 if (verify_st_order (&ss, st, false) == FAILURE)
2454 reject_statement ();
2455 st = next_statement ();
2465 case ST_DERIVED_DECL:
2471 if (gfc_current_state () != COMP_MODULE)
2473 gfc_error ("%s statement must appear in a MODULE",
2474 gfc_ascii_statement (st));
2478 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
2480 gfc_error ("%s statement at %C follows another accessibility "
2481 "specification", gfc_ascii_statement (st));
2485 gfc_current_ns->default_access = (st == ST_PUBLIC)
2486 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
2490 case ST_STATEMENT_FUNCTION:
2491 if (gfc_current_state () == COMP_MODULE)
2493 unexpected_statement (st);
2501 accept_statement (st);
2502 st = next_statement ();
2506 accept_statement (st);
2508 st = next_statement ();
2511 case ST_GET_FCN_CHARACTERISTICS:
2512 /* This statement triggers the association of a function's result
2514 ts = &gfc_current_block ()->result->ts;
2515 if (match_deferred_characteristics (ts) != MATCH_YES)
2516 bad_characteristic = true;
2518 st = next_statement ();
2525 /* If match_deferred_characteristics failed, then there is an error. */
2526 if (bad_characteristic)
2528 ts = &gfc_current_block ()->result->ts;
2529 if (ts->type != BT_DERIVED)
2530 gfc_error ("Bad kind expression for function '%s' at %L",
2531 gfc_current_block ()->name,
2532 &gfc_current_block ()->declared_at);
2534 gfc_error ("The type for function '%s' at %L is not accessible",
2535 gfc_current_block ()->name,
2536 &gfc_current_block ()->declared_at);
2538 gfc_current_block ()->ts.kind = 0;
2539 /* Keep the derived type; if it's bad, it will be discovered later. */
2540 if (!(ts->type == BT_DERIVED && ts->u.derived))
2541 ts->type = BT_UNKNOWN;
2548 /* Parse a WHERE block, (not a simple WHERE statement). */
2551 parse_where_block (void)
2553 int seen_empty_else;
2558 accept_statement (ST_WHERE_BLOCK);
2559 top = gfc_state_stack->tail;
2561 push_state (&s, COMP_WHERE, gfc_new_block);
2563 d = add_statement ();
2564 d->expr1 = top->expr1;
2570 seen_empty_else = 0;
2574 st = next_statement ();
2580 case ST_WHERE_BLOCK:
2581 parse_where_block ();
2586 accept_statement (st);
2590 if (seen_empty_else)
2592 gfc_error ("ELSEWHERE statement at %C follows previous "
2593 "unmasked ELSEWHERE");
2597 if (new_st.expr1 == NULL)
2598 seen_empty_else = 1;
2600 d = new_level (gfc_state_stack->head);
2602 d->expr1 = new_st.expr1;
2604 accept_statement (st);
2609 accept_statement (st);
2613 gfc_error ("Unexpected %s statement in WHERE block at %C",
2614 gfc_ascii_statement (st));
2615 reject_statement ();
2619 while (st != ST_END_WHERE);
2625 /* Parse a FORALL block (not a simple FORALL statement). */
2628 parse_forall_block (void)
2634 accept_statement (ST_FORALL_BLOCK);
2635 top = gfc_state_stack->tail;
2637 push_state (&s, COMP_FORALL, gfc_new_block);
2639 d = add_statement ();
2640 d->op = EXEC_FORALL;
2645 st = next_statement ();
2650 case ST_POINTER_ASSIGNMENT:
2653 accept_statement (st);
2656 case ST_WHERE_BLOCK:
2657 parse_where_block ();
2660 case ST_FORALL_BLOCK:
2661 parse_forall_block ();
2665 accept_statement (st);
2672 gfc_error ("Unexpected %s statement in FORALL block at %C",
2673 gfc_ascii_statement (st));
2675 reject_statement ();
2679 while (st != ST_END_FORALL);
2685 static gfc_statement parse_executable (gfc_statement);
2687 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2690 parse_if_block (void)
2699 accept_statement (ST_IF_BLOCK);
2701 top = gfc_state_stack->tail;
2702 push_state (&s, COMP_IF, gfc_new_block);
2704 new_st.op = EXEC_IF;
2705 d = add_statement ();
2707 d->expr1 = top->expr1;
2713 st = parse_executable (ST_NONE);
2723 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2724 "statement at %L", &else_locus);
2726 reject_statement ();
2730 d = new_level (gfc_state_stack->head);
2732 d->expr1 = new_st.expr1;
2734 accept_statement (st);
2741 gfc_error ("Duplicate ELSE statements at %L and %C",
2743 reject_statement ();
2748 else_locus = gfc_current_locus;
2750 d = new_level (gfc_state_stack->head);
2753 accept_statement (st);
2761 unexpected_statement (st);
2765 while (st != ST_ENDIF);
2768 accept_statement (st);
2772 /* Parse a SELECT block. */
2775 parse_select_block (void)
2781 accept_statement (ST_SELECT_CASE);
2783 cp = gfc_state_stack->tail;
2784 push_state (&s, COMP_SELECT, gfc_new_block);
2786 /* Make sure that the next statement is a CASE or END SELECT. */
2789 st = next_statement ();
2792 if (st == ST_END_SELECT)
2794 /* Empty SELECT CASE is OK. */
2795 accept_statement (st);
2802 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2805 reject_statement ();
2808 /* At this point, we're got a nonempty select block. */
2809 cp = new_level (cp);
2812 accept_statement (st);
2816 st = parse_executable (ST_NONE);
2823 cp = new_level (gfc_state_stack->head);
2825 gfc_clear_new_st ();
2827 accept_statement (st);
2833 /* Can't have an executable statement because of
2834 parse_executable(). */
2836 unexpected_statement (st);
2840 while (st != ST_END_SELECT);
2843 accept_statement (st);
2847 /* Given a symbol, make sure it is not an iteration variable for a DO
2848 statement. This subroutine is called when the symbol is seen in a
2849 context that causes it to become redefined. If the symbol is an
2850 iterator, we generate an error message and return nonzero. */
2853 gfc_check_do_variable (gfc_symtree *st)
2857 for (s=gfc_state_stack; s; s = s->previous)
2858 if (s->do_variable == st)
2860 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2861 "loop beginning at %L", st->name, &s->head->loc);
2869 /* Checks to see if the current statement label closes an enddo.
2870 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2871 an error) if it incorrectly closes an ENDDO. */
2874 check_do_closure (void)
2878 if (gfc_statement_label == NULL)
2881 for (p = gfc_state_stack; p; p = p->previous)
2882 if (p->state == COMP_DO)
2886 return 0; /* No loops to close */
2888 if (p->ext.end_do_label == gfc_statement_label)
2890 if (p == gfc_state_stack)
2893 gfc_error ("End of nonblock DO statement at %C is within another block");
2897 /* At this point, the label doesn't terminate the innermost loop.
2898 Make sure it doesn't terminate another one. */
2899 for (; p; p = p->previous)
2900 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2902 gfc_error ("End of nonblock DO statement at %C is interwoven "
2903 "with another DO loop");
2911 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2912 handled inside of parse_executable(), because they aren't really
2916 parse_do_block (void)
2923 s.ext.end_do_label = new_st.label1;
2925 if (new_st.ext.iterator != NULL)
2926 stree = new_st.ext.iterator->var->symtree;
2930 accept_statement (ST_DO);
2932 top = gfc_state_stack->tail;
2933 push_state (&s, COMP_DO, gfc_new_block);
2935 s.do_variable = stree;
2937 top->block = new_level (top);
2938 top->block->op = EXEC_DO;
2941 st = parse_executable (ST_NONE);
2949 if (s.ext.end_do_label != NULL
2950 && s.ext.end_do_label != gfc_statement_label)
2951 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2954 if (gfc_statement_label != NULL)
2956 new_st.op = EXEC_NOP;
2961 case ST_IMPLIED_ENDDO:
2962 /* If the do-stmt of this DO construct has a do-construct-name,
2963 the corresponding end-do must be an end-do-stmt (with a matching
2964 name, but in that case we must have seen ST_ENDDO first).
2965 We only complain about this in pedantic mode. */
2966 if (gfc_current_block () != NULL)
2967 gfc_error_now ("Named block DO at %L requires matching ENDDO name",
2968 &gfc_current_block()->declared_at);
2973 unexpected_statement (st);
2978 accept_statement (st);
2982 /* Parse the statements of OpenMP do/parallel do. */
2984 static gfc_statement
2985 parse_omp_do (gfc_statement omp_st)
2991 accept_statement (omp_st);
2993 cp = gfc_state_stack->tail;
2994 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2995 np = new_level (cp);
3001 st = next_statement ();
3004 else if (st == ST_DO)
3007 unexpected_statement (st);
3011 if (gfc_statement_label != NULL
3012 && gfc_state_stack->previous != NULL
3013 && gfc_state_stack->previous->state == COMP_DO
3014 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
3022 there should be no !$OMP END DO. */
3024 return ST_IMPLIED_ENDDO;
3027 check_do_closure ();
3030 st = next_statement ();
3031 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
3033 if (new_st.op == EXEC_OMP_END_NOWAIT)
3034 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3036 gcc_assert (new_st.op == EXEC_NOP);
3037 gfc_clear_new_st ();
3038 gfc_commit_symbols ();
3039 gfc_warning_check ();
3040 st = next_statement ();
3046 /* Parse the statements of OpenMP atomic directive. */
3049 parse_omp_atomic (void)
3055 accept_statement (ST_OMP_ATOMIC);
3057 cp = gfc_state_stack->tail;
3058 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3059 np = new_level (cp);
3065 st = next_statement ();
3068 else if (st == ST_ASSIGNMENT)
3071 unexpected_statement (st);
3074 accept_statement (st);
3080 /* Parse the statements of an OpenMP structured block. */
3083 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
3085 gfc_statement st, omp_end_st;
3089 accept_statement (omp_st);
3091 cp = gfc_state_stack->tail;
3092 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
3093 np = new_level (cp);
3099 case ST_OMP_PARALLEL:
3100 omp_end_st = ST_OMP_END_PARALLEL;
3102 case ST_OMP_PARALLEL_SECTIONS:
3103 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
3105 case ST_OMP_SECTIONS:
3106 omp_end_st = ST_OMP_END_SECTIONS;
3108 case ST_OMP_ORDERED:
3109 omp_end_st = ST_OMP_END_ORDERED;
3111 case ST_OMP_CRITICAL:
3112 omp_end_st = ST_OMP_END_CRITICAL;
3115 omp_end_st = ST_OMP_END_MASTER;
3118 omp_end_st = ST_OMP_END_SINGLE;
3121 omp_end_st = ST_OMP_END_TASK;
3123 case ST_OMP_WORKSHARE:
3124 omp_end_st = ST_OMP_END_WORKSHARE;
3126 case ST_OMP_PARALLEL_WORKSHARE:
3127 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
3135 if (workshare_stmts_only)
3137 /* Inside of !$omp workshare, only
3140 where statements and constructs
3141 forall statements and constructs
3145 are allowed. For !$omp critical these
3146 restrictions apply recursively. */
3149 st = next_statement ();
3160 accept_statement (st);
3163 case ST_WHERE_BLOCK:
3164 parse_where_block ();
3167 case ST_FORALL_BLOCK:
3168 parse_forall_block ();
3171 case ST_OMP_PARALLEL:
3172 case ST_OMP_PARALLEL_SECTIONS:
3173 parse_omp_structured_block (st, false);
3176 case ST_OMP_PARALLEL_WORKSHARE:
3177 case ST_OMP_CRITICAL:
3178 parse_omp_structured_block (st, true);
3181 case ST_OMP_PARALLEL_DO:
3182 st = parse_omp_do (st);
3186 parse_omp_atomic ();
3197 st = next_statement ();
3201 st = parse_executable (ST_NONE);
3204 else if (st == ST_OMP_SECTION
3205 && (omp_st == ST_OMP_SECTIONS
3206 || omp_st == ST_OMP_PARALLEL_SECTIONS))
3208 np = new_level (np);
3212 else if (st != omp_end_st)
3213 unexpected_statement (st);
3215 while (st != omp_end_st);
3219 case EXEC_OMP_END_NOWAIT:
3220 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
3222 case EXEC_OMP_CRITICAL:
3223 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
3224 || (new_st.ext.omp_name != NULL
3225 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
3226 gfc_error ("Name after !$omp critical and !$omp end critical does "
3228 gfc_free (CONST_CAST (char *, new_st.ext.omp_name));
3230 case EXEC_OMP_END_SINGLE:
3231 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
3232 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
3233 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
3234 gfc_free_omp_clauses (new_st.ext.omp_clauses);
3242 gfc_clear_new_st ();
3243 gfc_commit_symbols ();
3244 gfc_warning_check ();
3249 /* Accept a series of executable statements. We return the first
3250 statement that doesn't fit to the caller. Any block statements are
3251 passed on to the correct handler, which usually passes the buck
3254 static gfc_statement
3255 parse_executable (gfc_statement st)
3260 st = next_statement ();
3264 close_flag = check_do_closure ();
3269 case ST_END_PROGRAM:
3272 case ST_END_FUNCTION:
3276 case ST_END_SUBROUTINE:
3281 case ST_SELECT_CASE:
3282 gfc_error ("%s statement at %C cannot terminate a non-block "
3283 "DO loop", gfc_ascii_statement (st));
3299 accept_statement (st);
3300 if (close_flag == 1)
3301 return ST_IMPLIED_ENDDO;
3308 case ST_SELECT_CASE:
3309 parse_select_block ();
3314 if (check_do_closure () == 1)
3315 return ST_IMPLIED_ENDDO;
3318 case ST_WHERE_BLOCK:
3319 parse_where_block ();
3322 case ST_FORALL_BLOCK:
3323 parse_forall_block ();
3326 case ST_OMP_PARALLEL:
3327 case ST_OMP_PARALLEL_SECTIONS:
3328 case ST_OMP_SECTIONS:
3329 case ST_OMP_ORDERED:
3330 case ST_OMP_CRITICAL:
3334 parse_omp_structured_block (st, false);
3337 case ST_OMP_WORKSHARE:
3338 case ST_OMP_PARALLEL_WORKSHARE:
3339 parse_omp_structured_block (st, true);
3343 case ST_OMP_PARALLEL_DO:
3344 st = parse_omp_do (st);
3345 if (st == ST_IMPLIED_ENDDO)
3350 parse_omp_atomic ();
3357 st = next_statement ();
3362 /* Parse a series of contained program units. */
3364 static void parse_progunit (gfc_statement);
3367 /* Fix the symbols for sibling functions. These are incorrectly added to
3368 the child namespace as the parser didn't know about this procedure. */
3371 gfc_fixup_sibling_symbols (gfc_symbol *sym, gfc_namespace *siblings)
3375 gfc_symbol *old_sym;
3377 sym->attr.referenced = 1;
3378 for (ns = siblings; ns; ns = ns->sibling)
3380 st = gfc_find_symtree (ns->sym_root, sym->name);
3382 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
3383 goto fixup_contained;
3385 old_sym = st->n.sym;
3386 if (old_sym->ns == ns
3387 && !old_sym->attr.contained
3389 /* By 14.6.1.3, host association should be excluded
3390 for the following. */
3391 && !(old_sym->attr.external
3392 || (old_sym->ts.type != BT_UNKNOWN
3393 && !old_sym->attr.implicit_type)
3394 || old_sym->attr.flavor == FL_PARAMETER
3395 || old_sym->attr.in_common
3396 || old_sym->attr.in_equivalence
3397 || old_sym->attr.data
3398 || old_sym->attr.dummy
3399 || old_sym->attr.result
3400 || old_sym->attr.dimension
3401 || old_sym->attr.allocatable
3402 || old_sym->attr.intrinsic
3403 || old_sym->attr.generic
3404 || old_sym->attr.flavor == FL_NAMELIST
3405 || old_sym->attr.proc == PROC_ST_FUNCTION))
3407 /* Replace it with the symbol from the parent namespace. */
3411 /* Free the old (local) symbol. */
3413 if (old_sym->refs == 0)
3414 gfc_free_symbol (old_sym);
3418 /* Do the same for any contained procedures. */
3419 gfc_fixup_sibling_symbols (sym, ns->contained);
3424 parse_contained (int module)
3426 gfc_namespace *ns, *parent_ns, *tmp;
3427 gfc_state_data s1, s2;
3431 int contains_statements = 0;
3434 push_state (&s1, COMP_CONTAINS, NULL);
3435 parent_ns = gfc_current_ns;
3439 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
3441 gfc_current_ns->sibling = parent_ns->contained;
3442 parent_ns->contained = gfc_current_ns;
3445 /* Process the next available statement. We come here if we got an error
3446 and rejected the last statement. */
3447 st = next_statement ();
3456 contains_statements = 1;
3457 accept_statement (st);
3460 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
3463 /* For internal procedures, create/update the symbol in the
3464 parent namespace. */
3468 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
3469 gfc_error ("Contained procedure '%s' at %C is already "
3470 "ambiguous", gfc_new_block->name);
3473 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
3474 &gfc_new_block->declared_at) ==
3477 if (st == ST_FUNCTION)
3478 gfc_add_function (&sym->attr, sym->name,
3479 &gfc_new_block->declared_at);
3481 gfc_add_subroutine (&sym->attr, sym->name,
3482 &gfc_new_block->declared_at);
3486 gfc_commit_symbols ();
3489 sym = gfc_new_block;
3491 /* Mark this as a contained function, so it isn't replaced
3492 by other module functions. */
3493 sym->attr.contained = 1;
3494 sym->attr.referenced = 1;
3496 parse_progunit (ST_NONE);
3498 /* Fix up any sibling functions that refer to this one. */
3499 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
3500 /* Or refer to any of its alternate entry points. */
3501 for (el = gfc_current_ns->entries; el; el = el->next)
3502 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
3504 gfc_current_ns->code = s2.head;
3505 gfc_current_ns = parent_ns;
3510 /* These statements are associated with the end of the host unit. */
3511 case ST_END_FUNCTION:
3513 case ST_END_PROGRAM:
3514 case ST_END_SUBROUTINE:
3515 accept_statement (st);
3519 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3520 gfc_ascii_statement (st));
3521 reject_statement ();
3527 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
3528 && st != ST_END_MODULE && st != ST_END_PROGRAM);
3530 /* The first namespace in the list is guaranteed to not have
3531 anything (worthwhile) in it. */
3532 tmp = gfc_current_ns;
3533 gfc_current_ns = parent_ns;
3534 if (seen_error && tmp->refs > 1)
3535 gfc_free_namespace (tmp);
3537 ns = gfc_current_ns->contained;
3538 gfc_current_ns->contained = ns->sibling;
3539 gfc_free_namespace (ns);
3542 if (!contains_statements)
3543 gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CONTAINS statement without "
3544 "FUNCTION or SUBROUTINE statement at %C");
3548 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3551 parse_progunit (gfc_statement st)
3556 st = parse_spec (st);
3566 accept_statement (st);
3573 if (gfc_current_state () == COMP_FUNCTION)
3574 gfc_check_function_type (gfc_current_ns);
3579 st = parse_executable (st);
3590 accept_statement (st);
3597 unexpected_statement (st);
3598 reject_statement ();
3599 st = next_statement ();
3605 for (p = gfc_state_stack; p; p = p->previous)
3606 if (p->state == COMP_CONTAINS)
3609 if (gfc_find_state (COMP_MODULE) == SUCCESS)
3614 gfc_error ("CONTAINS statement at %C is already in a contained "
3616 st = next_statement ();
3620 parse_contained (0);
3623 gfc_current_ns->code = gfc_state_stack->head;
3627 /* Come here to complain about a global symbol already in use as
3631 gfc_global_used (gfc_gsymbol *sym, locus *where)
3636 where = &gfc_current_locus;
3646 case GSYM_SUBROUTINE:
3647 name = "SUBROUTINE";
3652 case GSYM_BLOCK_DATA:
3653 name = "BLOCK DATA";
3659 gfc_internal_error ("gfc_global_used(): Bad type");
3663 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3664 sym->name, where, name, &sym->where);
3668 /* Parse a block data program unit. */
3671 parse_block_data (void)
3674 static locus blank_locus;
3675 static int blank_block=0;
3678 gfc_current_ns->proc_name = gfc_new_block;
3679 gfc_current_ns->is_block_data = 1;
3681 if (gfc_new_block == NULL)
3684 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3685 "prior BLOCK DATA at %L", &blank_locus);
3689 blank_locus = gfc_current_locus;
3694 s = gfc_get_gsymbol (gfc_new_block->name);
3696 || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3697 gfc_global_used(s, NULL);
3700 s->type = GSYM_BLOCK_DATA;
3701 s->where = gfc_current_locus;
3706 st = parse_spec (ST_NONE);
3708 while (st != ST_END_BLOCK_DATA)
3710 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3711 gfc_ascii_statement (st));
3712 reject_statement ();
3713 st = next_statement ();
3718 /* Parse a module subprogram. */
3726 s = gfc_get_gsymbol (gfc_new_block->name);
3727 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3728 gfc_global_used(s, NULL);
3731 s->type = GSYM_MODULE;
3732 s->where = gfc_current_locus;
3736 st = parse_spec (ST_NONE);
3745 parse_contained (1);
3749 accept_statement (st);
3753 gfc_error ("Unexpected %s statement in MODULE at %C",
3754 gfc_ascii_statement (st));
3756 reject_statement ();
3757 st = next_statement ();
3761 s->ns = gfc_current_ns;
3765 /* Add a procedure name to the global symbol table. */
3768 add_global_procedure (int sub)
3772 s = gfc_get_gsymbol(gfc_new_block->name);
3775 || (s->type != GSYM_UNKNOWN
3776 && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3777 gfc_global_used(s, NULL);
3780 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3781 s->where = gfc_current_locus;
3783 s->ns = gfc_current_ns;
3788 /* Add a program to the global symbol table. */
3791 add_global_program (void)
3795 if (gfc_new_block == NULL)
3797 s = gfc_get_gsymbol (gfc_new_block->name);
3799 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3800 gfc_global_used(s, NULL);
3803 s->type = GSYM_PROGRAM;
3804 s->where = gfc_current_locus;
3806 s->ns = gfc_current_ns;
3811 /* Resolve all the program units when whole file scope option
3814 resolve_all_program_units (gfc_namespace *gfc_global_ns_list)
3816 gfc_free_dt_list ();
3817 gfc_current_ns = gfc_global_ns_list;
3818 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3820 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3821 gfc_resolve (gfc_current_ns);
3822 gfc_current_ns->derived_types = gfc_derived_types;
3823 gfc_derived_types = NULL;
3829 clean_up_modules (gfc_gsymbol *gsym)
3834 clean_up_modules (gsym->left);
3835 clean_up_modules (gsym->right);
3837 if (gsym->type != GSYM_MODULE || !gsym->ns)
3840 gfc_current_ns = gsym->ns;
3841 gfc_derived_types = gfc_current_ns->derived_types;
3848 /* Translate all the program units when whole file scope option
3849 is active. This could be in a different order to resolution if
3850 there are forward references in the file. */
3852 translate_all_program_units (gfc_namespace *gfc_global_ns_list)
3856 gfc_current_ns = gfc_global_ns_list;
3857 gfc_get_errors (NULL, &errors);
3859 for (; !errors && gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
3861 gfc_current_locus = gfc_current_ns->proc_name->declared_at;
3862 gfc_derived_types = gfc_current_ns->derived_types;
3863 gfc_generate_code (gfc_current_ns);
3864 gfc_current_ns->translated = 1;
3867 /* Clean up all the namespaces after translation. */
3868 gfc_current_ns = gfc_global_ns_list;
3869 for (;gfc_current_ns;)
3871 gfc_namespace *ns = gfc_current_ns->sibling;
3872 gfc_derived_types = gfc_current_ns->derived_types;
3874 gfc_current_ns = ns;
3877 clean_up_modules (gfc_gsym_root);
3881 /* Top level parser. */
3884 gfc_parse_file (void)
3886 int seen_program, errors_before, errors;
3887 gfc_state_data top, s;
3890 gfc_namespace *next;
3892 gfc_start_source_files ();
3894 top.state = COMP_NONE;
3896 top.previous = NULL;
3897 top.head = top.tail = NULL;
3898 top.do_variable = NULL;
3900 gfc_state_stack = ⊤
3902 gfc_clear_new_st ();
3904 gfc_statement_label = NULL;
3906 if (setjmp (eof_buf))
3907 return FAILURE; /* Come here on unexpected EOF */
3909 /* Prepare the global namespace that will contain the
3911 gfc_global_ns_list = next = NULL;
3915 /* Exit early for empty files. */
3921 st = next_statement ();
3930 goto duplicate_main;
3932 prog_locus = gfc_current_locus;
3934 push_state (&s, COMP_PROGRAM, gfc_new_block);
3935 main_program_symbol(gfc_current_ns, gfc_new_block->name);
3936 accept_statement (st);
3937 add_global_program ();
3938 parse_progunit (ST_NONE);
3939 if (gfc_option.flag_whole_file)
3944 add_global_procedure (1);
3945 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3946 accept_statement (st);
3947 parse_progunit (ST_NONE);
3948 if (gfc_option.flag_whole_file)
3953 add_global_procedure (0);
3954 push_state (&s, COMP_FUNCTION, gfc_new_block);
3955 accept_statement (st);
3956 parse_progunit (ST_NONE);
3957 if (gfc_option.flag_whole_file)
3962 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3963 accept_statement (st);
3964 parse_block_data ();
3968 push_state (&s, COMP_MODULE, gfc_new_block);
3969 accept_statement (st);
3971 gfc_get_errors (NULL, &errors_before);
3975 /* Anything else starts a nameless main program block. */
3978 goto duplicate_main;
3980 prog_locus = gfc_current_locus;
3982 push_state (&s, COMP_PROGRAM, gfc_new_block);
3983 main_program_symbol (gfc_current_ns, "MAIN__");
3984 parse_progunit (st);
3985 if (gfc_option.flag_whole_file)
3990 /* Handle the non-program units. */
3991 gfc_current_ns->code = s.head;
3993 gfc_resolve (gfc_current_ns);
3995 /* Dump the parse tree if requested. */
3996 if (gfc_option.dump_parse_tree)
3997 gfc_dump_parse_tree (gfc_current_ns, stdout);
3999 gfc_get_errors (NULL, &errors);
4000 if (s.state == COMP_MODULE)
4002 gfc_dump_module (s.sym->name, errors_before == errors);
4004 gfc_generate_module_code (gfc_current_ns);
4006 if (!gfc_option.flag_whole_file)
4010 gfc_current_ns->derived_types = gfc_derived_types;
4011 gfc_derived_types = NULL;
4012 gfc_current_ns = NULL;
4018 gfc_generate_code (gfc_current_ns);
4026 /* The main program and non-contained procedures are put
4027 in the global namespace list, so that they can be processed
4028 later and all their interfaces resolved. */
4029 gfc_current_ns->code = s.head;
4031 next->sibling = gfc_current_ns;
4033 gfc_global_ns_list = gfc_current_ns;
4035 next = gfc_current_ns;
4042 if (!gfc_option.flag_whole_file)
4045 /* Do the resolution. */
4046 resolve_all_program_units (gfc_global_ns_list);
4048 /* Do the parse tree dump. */
4050 = gfc_option.dump_parse_tree ? gfc_global_ns_list : NULL;
4052 for (; gfc_current_ns; gfc_current_ns = gfc_current_ns->sibling)
4054 gfc_dump_parse_tree (gfc_current_ns, stdout);
4055 fputs ("------------------------------------------\n\n", stdout);
4058 /* Do the translation. */
4059 translate_all_program_units (gfc_global_ns_list);
4063 gfc_end_source_files ();
4067 /* If we see a duplicate main program, shut down. If the second
4068 instance is an implied main program, i.e. data decls or executable
4069 statements, we're in for lots of errors. */
4070 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
4071 reject_statement ();