2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
30 /* Current statement label. Zero means no statement label. Because new_st
31 can get wiped during statement matching, we have to keep it separate. */
33 gfc_st_label
*gfc_statement_label
;
35 static locus label_locus
;
36 static jmp_buf eof_buf
;
38 gfc_state_data
*gfc_state_stack
;
40 /* TODO: Re-order functions to kill these forward decls. */
41 static void check_statement_label (gfc_statement
);
42 static void undo_new_statement (void);
43 static void reject_statement (void);
46 /* A sort of half-matching function. We try to match the word on the
47 input with the passed string. If this succeeds, we call the
48 keyword-dependent matching function that will match the rest of the
49 statement. For single keywords, the matching subroutine is
53 match_word (const char *str
, match (*subr
) (void), locus
*old_locus
)
68 gfc_current_locus
= *old_locus
;
76 /* Figure out what the next statement is, (mostly) regardless of
77 proper ordering. The do...while(0) is there to prevent if/else
80 #define match(keyword, subr, st) \
82 if (match_word(keyword, subr, &old_locus) == MATCH_YES) \
85 undo_new_statement (); \
89 /* This is a specialist version of decode_statement that is used
90 for the specification statements in a function, whose
91 characteristics are deferred into the specification statements.
92 eg.: INTEGER (king = mykind) foo ()
93 USE mymodule, ONLY mykind.....
94 The KIND parameter needs a return after USE or IMPORT, whereas
95 derived type declarations can occur anywhere, up the executable
96 block. ST_GET_FCN_CHARACTERISTICS is returned when we have run
97 out of the correct kind of specification statements. */
99 decode_specification_statement (void)
105 if (gfc_match_eos () == MATCH_YES
)
108 old_locus
= gfc_current_locus
;
110 match ("import", gfc_match_import
, ST_IMPORT
);
111 match ("use", gfc_match_use
, ST_USE
);
113 if (gfc_current_block ()->ts
.type
!= BT_DERIVED
)
116 match (NULL
, gfc_match_st_function
, ST_STATEMENT_FUNCTION
);
117 match (NULL
, gfc_match_data_decl
, ST_DATA_DECL
);
118 match (NULL
, gfc_match_enumerator_def
, ST_ENUMERATOR
);
120 /* General statement matching: Instead of testing every possible
121 statement, we eliminate most possibilities by peeking at the
124 c
= gfc_peek_ascii_char ();
129 match ("abstract% interface", gfc_match_abstract_interface
,
134 match (NULL
, gfc_match_bind_c_stmt
, ST_ATTR_DECL
);
141 match ("data", gfc_match_data
, ST_DATA
);
142 match ("dimension", gfc_match_dimension
, ST_ATTR_DECL
);
146 match ("enum , bind ( c )", gfc_match_enum
, ST_ENUM
);
147 match ("entry% ", gfc_match_entry
, ST_ENTRY
);
148 match ("equivalence", gfc_match_equivalence
, ST_EQUIVALENCE
);
149 match ("external", gfc_match_external
, ST_ATTR_DECL
);
153 match ("format", gfc_match_format
, ST_FORMAT
);
160 match ("implicit", gfc_match_implicit
, ST_IMPLICIT
);
161 match ("implicit% none", gfc_match_implicit_none
, ST_IMPLICIT_NONE
);
162 match ("interface", gfc_match_interface
, ST_INTERFACE
);
163 match ("intent", gfc_match_intent
, ST_ATTR_DECL
);
164 match ("intrinsic", gfc_match_intrinsic
, ST_ATTR_DECL
);
171 match ("namelist", gfc_match_namelist
, ST_NAMELIST
);
175 match ("optional", gfc_match_optional
, ST_ATTR_DECL
);
179 match ("parameter", gfc_match_parameter
, ST_PARAMETER
);
180 match ("pointer", gfc_match_pointer
, ST_ATTR_DECL
);
181 if (gfc_match_private (&st
) == MATCH_YES
)
183 match ("procedure", gfc_match_procedure
, ST_PROCEDURE
);
184 if (gfc_match_public (&st
) == MATCH_YES
)
186 match ("protected", gfc_match_protected
, ST_ATTR_DECL
);
193 match ("save", gfc_match_save
, ST_ATTR_DECL
);
197 match ("target", gfc_match_target
, ST_ATTR_DECL
);
198 match ("type", gfc_match_derived_decl
, ST_DERIVED_DECL
);
205 match ("value", gfc_match_value
, ST_ATTR_DECL
);
206 match ("volatile", gfc_match_volatile
, ST_ATTR_DECL
);
213 /* This is not a specification statement. See if any of the matchers
214 has stored an error message of some sort. */
218 gfc_buffer_error (0);
219 gfc_current_locus
= old_locus
;
221 return ST_GET_FCN_CHARACTERISTICS
;
225 /* This is the primary 'decode_statement'. */
227 decode_statement (void)
238 gfc_clear_error (); /* Clear any pending errors. */
239 gfc_clear_warning (); /* Clear any pending warnings. */
241 gfc_matching_function
= false;
243 if (gfc_match_eos () == MATCH_YES
)
246 if (gfc_current_state () == COMP_FUNCTION
247 && gfc_current_block ()->result
->ts
.kind
== -1)
248 return decode_specification_statement ();
250 old_locus
= gfc_current_locus
;
252 /* Try matching a data declaration or function declaration. The
253 input "REALFUNCTIONA(N)" can mean several things in different
254 contexts, so it (and its relatives) get special treatment. */
256 if (gfc_current_state () == COMP_NONE
257 || gfc_current_state () == COMP_INTERFACE
258 || gfc_current_state () == COMP_CONTAINS
)
260 gfc_matching_function
= true;
261 m
= gfc_match_function_decl ();
264 else if (m
== MATCH_ERROR
)
268 gfc_current_locus
= old_locus
;
270 gfc_matching_function
= false;
273 /* Match statements whose error messages are meant to be overwritten
274 by something better. */
276 match (NULL
, gfc_match_assignment
, ST_ASSIGNMENT
);
277 match (NULL
, gfc_match_pointer_assignment
, ST_POINTER_ASSIGNMENT
);
278 match (NULL
, gfc_match_st_function
, ST_STATEMENT_FUNCTION
);
280 match (NULL
, gfc_match_data_decl
, ST_DATA_DECL
);
281 match (NULL
, gfc_match_enumerator_def
, ST_ENUMERATOR
);
283 /* Try to match a subroutine statement, which has the same optional
284 prefixes that functions can have. */
286 if (gfc_match_subroutine () == MATCH_YES
)
287 return ST_SUBROUTINE
;
289 gfc_current_locus
= old_locus
;
291 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
292 might begin with a block label. The match functions for these
293 statements are unusual in that their keyword is not seen before
294 the matcher is called. */
296 if (gfc_match_if (&st
) == MATCH_YES
)
299 gfc_current_locus
= old_locus
;
301 if (gfc_match_where (&st
) == MATCH_YES
)
304 gfc_current_locus
= old_locus
;
306 if (gfc_match_forall (&st
) == MATCH_YES
)
309 gfc_current_locus
= old_locus
;
311 match (NULL
, gfc_match_do
, ST_DO
);
312 match (NULL
, gfc_match_select
, ST_SELECT_CASE
);
314 /* General statement matching: Instead of testing every possible
315 statement, we eliminate most possibilities by peeking at the
318 c
= gfc_peek_ascii_char ();
323 match ("abstract% interface", gfc_match_abstract_interface
,
325 match ("allocate", gfc_match_allocate
, ST_ALLOCATE
);
326 match ("allocatable", gfc_match_allocatable
, ST_ATTR_DECL
);
327 match ("assign", gfc_match_assign
, ST_LABEL_ASSIGNMENT
);
331 match ("backspace", gfc_match_backspace
, ST_BACKSPACE
);
332 match ("block data", gfc_match_block_data
, ST_BLOCK_DATA
);
333 match (NULL
, gfc_match_bind_c_stmt
, ST_ATTR_DECL
);
337 match ("call", gfc_match_call
, ST_CALL
);
338 match ("close", gfc_match_close
, ST_CLOSE
);
339 match ("continue", gfc_match_continue
, ST_CONTINUE
);
340 match ("cycle", gfc_match_cycle
, ST_CYCLE
);
341 match ("case", gfc_match_case
, ST_CASE
);
342 match ("common", gfc_match_common
, ST_COMMON
);
343 match ("contains", gfc_match_eos
, ST_CONTAINS
);
347 match ("deallocate", gfc_match_deallocate
, ST_DEALLOCATE
);
348 match ("data", gfc_match_data
, ST_DATA
);
349 match ("dimension", gfc_match_dimension
, ST_ATTR_DECL
);
353 match ("end file", gfc_match_endfile
, ST_END_FILE
);
354 match ("exit", gfc_match_exit
, ST_EXIT
);
355 match ("else", gfc_match_else
, ST_ELSE
);
356 match ("else where", gfc_match_elsewhere
, ST_ELSEWHERE
);
357 match ("else if", gfc_match_elseif
, ST_ELSEIF
);
358 match ("enum , bind ( c )", gfc_match_enum
, ST_ENUM
);
360 if (gfc_match_end (&st
) == MATCH_YES
)
363 match ("entry% ", gfc_match_entry
, ST_ENTRY
);
364 match ("equivalence", gfc_match_equivalence
, ST_EQUIVALENCE
);
365 match ("external", gfc_match_external
, ST_ATTR_DECL
);
369 match ("final", gfc_match_final_decl
, ST_FINAL
);
370 match ("flush", gfc_match_flush
, ST_FLUSH
);
371 match ("format", gfc_match_format
, ST_FORMAT
);
375 match ("go to", gfc_match_goto
, ST_GOTO
);
379 match ("inquire", gfc_match_inquire
, ST_INQUIRE
);
380 match ("implicit", gfc_match_implicit
, ST_IMPLICIT
);
381 match ("implicit% none", gfc_match_implicit_none
, ST_IMPLICIT_NONE
);
382 match ("import", gfc_match_import
, ST_IMPORT
);
383 match ("interface", gfc_match_interface
, ST_INTERFACE
);
384 match ("intent", gfc_match_intent
, ST_ATTR_DECL
);
385 match ("intrinsic", gfc_match_intrinsic
, ST_ATTR_DECL
);
389 match ("module% procedure% ", gfc_match_modproc
, ST_MODULE_PROC
);
390 match ("module", gfc_match_module
, ST_MODULE
);
394 match ("nullify", gfc_match_nullify
, ST_NULLIFY
);
395 match ("namelist", gfc_match_namelist
, ST_NAMELIST
);
399 match ("open", gfc_match_open
, ST_OPEN
);
400 match ("optional", gfc_match_optional
, ST_ATTR_DECL
);
404 match ("print", gfc_match_print
, ST_WRITE
);
405 match ("parameter", gfc_match_parameter
, ST_PARAMETER
);
406 match ("pause", gfc_match_pause
, ST_PAUSE
);
407 match ("pointer", gfc_match_pointer
, ST_ATTR_DECL
);
408 if (gfc_match_private (&st
) == MATCH_YES
)
410 match ("procedure", gfc_match_procedure
, ST_PROCEDURE
);
411 match ("program", gfc_match_program
, ST_PROGRAM
);
412 if (gfc_match_public (&st
) == MATCH_YES
)
414 match ("protected", gfc_match_protected
, ST_ATTR_DECL
);
418 match ("read", gfc_match_read
, ST_READ
);
419 match ("return", gfc_match_return
, ST_RETURN
);
420 match ("rewind", gfc_match_rewind
, ST_REWIND
);
424 match ("sequence", gfc_match_eos
, ST_SEQUENCE
);
425 match ("stop", gfc_match_stop
, ST_STOP
);
426 match ("save", gfc_match_save
, ST_ATTR_DECL
);
430 match ("target", gfc_match_target
, ST_ATTR_DECL
);
431 match ("type", gfc_match_derived_decl
, ST_DERIVED_DECL
);
435 match ("use", gfc_match_use
, ST_USE
);
439 match ("value", gfc_match_value
, ST_ATTR_DECL
);
440 match ("volatile", gfc_match_volatile
, ST_ATTR_DECL
);
444 match ("wait", gfc_match_wait
, ST_WAIT
);
445 match ("write", gfc_match_write
, ST_WRITE
);
449 /* All else has failed, so give up. See if any of the matchers has
450 stored an error message of some sort. */
452 if (gfc_error_check () == 0)
453 gfc_error_now ("Unclassifiable statement at %C");
457 gfc_error_recovery ();
463 decode_omp_directive (void)
472 gfc_clear_error (); /* Clear any pending errors. */
473 gfc_clear_warning (); /* Clear any pending warnings. */
477 gfc_error_now ("OpenMP directives at %C may not appear in PURE "
478 "or ELEMENTAL procedures");
479 gfc_error_recovery ();
483 old_locus
= gfc_current_locus
;
485 /* General OpenMP directive matching: Instead of testing every possible
486 statement, we eliminate most possibilities by peeking at the
489 c
= gfc_peek_ascii_char ();
494 match ("atomic", gfc_match_omp_atomic
, ST_OMP_ATOMIC
);
497 match ("barrier", gfc_match_omp_barrier
, ST_OMP_BARRIER
);
500 match ("critical", gfc_match_omp_critical
, ST_OMP_CRITICAL
);
503 match ("do", gfc_match_omp_do
, ST_OMP_DO
);
506 match ("end critical", gfc_match_omp_critical
, ST_OMP_END_CRITICAL
);
507 match ("end do", gfc_match_omp_end_nowait
, ST_OMP_END_DO
);
508 match ("end master", gfc_match_omp_eos
, ST_OMP_END_MASTER
);
509 match ("end ordered", gfc_match_omp_eos
, ST_OMP_END_ORDERED
);
510 match ("end parallel do", gfc_match_omp_eos
, ST_OMP_END_PARALLEL_DO
);
511 match ("end parallel sections", gfc_match_omp_eos
,
512 ST_OMP_END_PARALLEL_SECTIONS
);
513 match ("end parallel workshare", gfc_match_omp_eos
,
514 ST_OMP_END_PARALLEL_WORKSHARE
);
515 match ("end parallel", gfc_match_omp_eos
, ST_OMP_END_PARALLEL
);
516 match ("end sections", gfc_match_omp_end_nowait
, ST_OMP_END_SECTIONS
);
517 match ("end single", gfc_match_omp_end_single
, ST_OMP_END_SINGLE
);
518 match ("end task", gfc_match_omp_eos
, ST_OMP_END_TASK
);
519 match ("end workshare", gfc_match_omp_end_nowait
,
520 ST_OMP_END_WORKSHARE
);
523 match ("flush", gfc_match_omp_flush
, ST_OMP_FLUSH
);
526 match ("master", gfc_match_omp_master
, ST_OMP_MASTER
);
529 match ("ordered", gfc_match_omp_ordered
, ST_OMP_ORDERED
);
532 match ("parallel do", gfc_match_omp_parallel_do
, ST_OMP_PARALLEL_DO
);
533 match ("parallel sections", gfc_match_omp_parallel_sections
,
534 ST_OMP_PARALLEL_SECTIONS
);
535 match ("parallel workshare", gfc_match_omp_parallel_workshare
,
536 ST_OMP_PARALLEL_WORKSHARE
);
537 match ("parallel", gfc_match_omp_parallel
, ST_OMP_PARALLEL
);
540 match ("sections", gfc_match_omp_sections
, ST_OMP_SECTIONS
);
541 match ("section", gfc_match_omp_eos
, ST_OMP_SECTION
);
542 match ("single", gfc_match_omp_single
, ST_OMP_SINGLE
);
545 match ("task", gfc_match_omp_task
, ST_OMP_TASK
);
546 match ("taskwait", gfc_match_omp_taskwait
, ST_OMP_TASKWAIT
);
547 match ("threadprivate", gfc_match_omp_threadprivate
,
548 ST_OMP_THREADPRIVATE
);
550 match ("workshare", gfc_match_omp_workshare
, ST_OMP_WORKSHARE
);
554 /* All else has failed, so give up. See if any of the matchers has
555 stored an error message of some sort. */
557 if (gfc_error_check () == 0)
558 gfc_error_now ("Unclassifiable OpenMP directive at %C");
562 gfc_error_recovery ();
570 /* Get the next statement in free form source. */
579 at_bol
= gfc_at_bol ();
580 gfc_gobble_whitespace ();
582 c
= gfc_peek_ascii_char ();
588 /* Found a statement label? */
589 m
= gfc_match_st_label (&gfc_statement_label
);
591 d
= gfc_peek_ascii_char ();
592 if (m
!= MATCH_YES
|| !gfc_is_whitespace (d
))
594 gfc_match_small_literal_int (&i
, &cnt
);
597 gfc_error_now ("Too many digits in statement label at %C");
600 gfc_error_now ("Zero is not a valid statement label at %C");
603 c
= gfc_next_ascii_char ();
606 if (!gfc_is_whitespace (c
))
607 gfc_error_now ("Non-numeric character in statement label at %C");
613 label_locus
= gfc_current_locus
;
615 gfc_gobble_whitespace ();
617 if (at_bol
&& gfc_peek_ascii_char () == ';')
619 gfc_error_now ("Semicolon at %C needs to be preceded by "
621 gfc_next_ascii_char (); /* Eat up the semicolon. */
625 if (gfc_match_eos () == MATCH_YES
)
627 gfc_warning_now ("Ignoring statement label in empty statement "
629 gfc_free_st_label (gfc_statement_label
);
630 gfc_statement_label
= NULL
;
637 /* Comments have already been skipped by the time we get here,
638 except for OpenMP directives. */
639 if (gfc_option
.flag_openmp
)
643 c
= gfc_next_ascii_char ();
644 for (i
= 0; i
< 5; i
++, c
= gfc_next_ascii_char ())
645 gcc_assert (c
== "!$omp"[i
]);
647 gcc_assert (c
== ' ' || c
== '\t');
648 gfc_gobble_whitespace ();
649 return decode_omp_directive ();
653 if (at_bol
&& c
== ';')
655 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
656 gfc_next_ascii_char (); /* Eat up the semicolon. */
660 return decode_statement ();
664 /* Get the next statement in fixed-form source. */
669 int label
, digit_flag
, i
;
674 return decode_statement ();
676 /* Skip past the current label field, parsing a statement label if
677 one is there. This is a weird number parser, since the number is
678 contained within five columns and can have any kind of embedded
679 spaces. We also check for characters that make the rest of the
685 for (i
= 0; i
< 5; i
++)
687 c
= gfc_next_char_literal (0);
704 label
= label
* 10 + ((unsigned char) c
- '0');
705 label_locus
= gfc_current_locus
;
709 /* Comments have already been skipped by the time we get
710 here, except for OpenMP directives. */
712 if (gfc_option
.flag_openmp
)
714 for (i
= 0; i
< 5; i
++, c
= gfc_next_char_literal (0))
715 gcc_assert ((char) gfc_wide_tolower (c
) == "*$omp"[i
]);
717 if (c
!= ' ' && c
!= '0')
719 gfc_buffer_error (0);
720 gfc_error ("Bad continuation line at %C");
724 return decode_omp_directive ();
728 /* Comments have already been skipped by the time we get
729 here so don't bother checking for them. */
732 gfc_buffer_error (0);
733 gfc_error ("Non-numeric character in statement label at %C");
741 gfc_warning_now ("Zero is not a valid statement label at %C");
744 /* We've found a valid statement label. */
745 gfc_statement_label
= gfc_get_st_label (label
);
749 /* Since this line starts a statement, it cannot be a continuation
750 of a previous statement. If we see something here besides a
751 space or zero, it must be a bad continuation line. */
753 c
= gfc_next_char_literal (0);
757 if (c
!= ' ' && c
!= '0')
759 gfc_buffer_error (0);
760 gfc_error ("Bad continuation line at %C");
764 /* Now that we've taken care of the statement label columns, we have
765 to make sure that the first nonblank character is not a '!'. If
766 it is, the rest of the line is a comment. */
770 loc
= gfc_current_locus
;
771 c
= gfc_next_char_literal (0);
773 while (gfc_is_whitespace (c
));
777 gfc_current_locus
= loc
;
781 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
785 if (gfc_match_eos () == MATCH_YES
)
788 /* At this point, we've got a nonblank statement to parse. */
789 return decode_statement ();
793 gfc_warning ("Ignoring statement label in empty statement at %C");
799 /* Return the next non-ST_NONE statement to the caller. We also worry
800 about including files and the ends of include files at this stage. */
803 next_statement (void)
807 gfc_new_block
= NULL
;
811 gfc_statement_label
= NULL
;
812 gfc_buffer_error (1);
816 if ((gfc_option
.warn_line_truncation
|| gfc_current_form
== FORM_FREE
)
817 && gfc_current_locus
.lb
818 && gfc_current_locus
.lb
->truncated
)
819 gfc_warning_now ("Line truncated at %C");
824 gfc_skip_comments ();
832 if (gfc_define_undef_line ())
835 old_locus
= gfc_current_locus
;
837 st
= (gfc_current_form
== FORM_FIXED
) ? next_fixed () : next_free ();
843 gfc_buffer_error (0);
845 if (st
== ST_GET_FCN_CHARACTERISTICS
&& gfc_statement_label
!= NULL
)
847 gfc_free_st_label (gfc_statement_label
);
848 gfc_statement_label
= NULL
;
849 gfc_current_locus
= old_locus
;
853 check_statement_label (st
);
859 /****************************** Parser ***********************************/
861 /* The parser subroutines are of type 'try' that fail if the file ends
864 /* Macros that expand to case-labels for various classes of
865 statements. Start with executable statements that directly do
868 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
869 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
870 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
871 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
872 case ST_PAUSE: case ST_STOP: case ST_WAIT: case ST_WRITE: \
873 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
874 case ST_ASSIGNMENT: case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
875 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
876 case ST_OMP_BARRIER: case ST_OMP_TASKWAIT
878 /* Statements that mark other executable statements. */
880 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
881 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
882 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
883 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
884 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
885 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE: \
888 /* Declaration statements */
890 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
891 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
892 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE: \
895 /* Block end statements. Errors associated with interchanging these
896 are detected in gfc_match_end(). */
898 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
899 case ST_END_PROGRAM: case ST_END_SUBROUTINE
902 /* Push a new state onto the stack. */
905 push_state (gfc_state_data
*p
, gfc_compile_state new_state
, gfc_symbol
*sym
)
907 p
->state
= new_state
;
908 p
->previous
= gfc_state_stack
;
910 p
->head
= p
->tail
= NULL
;
911 p
->do_variable
= NULL
;
916 /* Pop the current state. */
920 gfc_state_stack
= gfc_state_stack
->previous
;
924 /* Try to find the given state in the state stack. */
927 gfc_find_state (gfc_compile_state state
)
931 for (p
= gfc_state_stack
; p
; p
= p
->previous
)
932 if (p
->state
== state
)
935 return (p
== NULL
) ? FAILURE
: SUCCESS
;
939 /* Starts a new level in the statement list. */
942 new_level (gfc_code
*q
)
946 p
= q
->block
= gfc_get_code ();
948 gfc_state_stack
->head
= gfc_state_stack
->tail
= p
;
954 /* Add the current new_st code structure and adds it to the current
955 program unit. As a side-effect, it zeroes the new_st. */
965 p
->loc
= gfc_current_locus
;
967 if (gfc_state_stack
->head
== NULL
)
968 gfc_state_stack
->head
= p
;
970 gfc_state_stack
->tail
->next
= p
;
972 while (p
->next
!= NULL
)
975 gfc_state_stack
->tail
= p
;
983 /* Frees everything associated with the current statement. */
986 undo_new_statement (void)
988 gfc_free_statements (new_st
.block
);
989 gfc_free_statements (new_st
.next
);
990 gfc_free_statement (&new_st
);
995 /* If the current statement has a statement label, make sure that it
996 is allowed to, or should have one. */
999 check_statement_label (gfc_statement st
)
1003 if (gfc_statement_label
== NULL
)
1005 if (st
== ST_FORMAT
)
1006 gfc_error ("FORMAT statement at %L does not have a statement label",
1013 case ST_END_PROGRAM
:
1014 case ST_END_FUNCTION
:
1015 case ST_END_SUBROUTINE
:
1021 type
= ST_LABEL_TARGET
;
1025 type
= ST_LABEL_FORMAT
;
1028 /* Statement labels are not restricted from appearing on a
1029 particular line. However, there are plenty of situations
1030 where the resulting label can't be referenced. */
1033 type
= ST_LABEL_BAD_TARGET
;
1037 gfc_define_st_label (gfc_statement_label
, type
, &label_locus
);
1039 new_st
.here
= gfc_statement_label
;
1043 /* Figures out what the enclosing program unit is. This will be a
1044 function, subroutine, program, block data or module. */
1047 gfc_enclosing_unit (gfc_compile_state
* result
)
1051 for (p
= gfc_state_stack
; p
; p
= p
->previous
)
1052 if (p
->state
== COMP_FUNCTION
|| p
->state
== COMP_SUBROUTINE
1053 || p
->state
== COMP_MODULE
|| p
->state
== COMP_BLOCK_DATA
1054 || p
->state
== COMP_PROGRAM
)
1063 *result
= COMP_PROGRAM
;
1068 /* Translate a statement enum to a string. */
1071 gfc_ascii_statement (gfc_statement st
)
1077 case ST_ARITHMETIC_IF
:
1078 p
= _("arithmetic IF");
1084 p
= _("attribute declaration");
1114 p
= _("data declaration");
1122 case ST_DERIVED_DECL
:
1123 p
= _("derived type declaration");
1137 case ST_END_BLOCK_DATA
:
1138 p
= "END BLOCK DATA";
1149 case ST_END_FUNCTION
:
1155 case ST_END_INTERFACE
:
1156 p
= "END INTERFACE";
1161 case ST_END_PROGRAM
:
1167 case ST_END_SUBROUTINE
:
1168 p
= "END SUBROUTINE";
1179 case ST_EQUIVALENCE
:
1188 case ST_FORALL_BLOCK
: /* Fall through */
1207 case ST_IMPLICIT_NONE
:
1208 p
= "IMPLICIT NONE";
1210 case ST_IMPLIED_ENDDO
:
1211 p
= _("implied END DO");
1237 case ST_MODULE_PROC
:
1238 p
= "MODULE PROCEDURE";
1276 case ST_WHERE_BLOCK
: /* Fall through */
1287 p
= _("assignment");
1289 case ST_POINTER_ASSIGNMENT
:
1290 p
= _("pointer assignment");
1292 case ST_SELECT_CASE
:
1301 case ST_STATEMENT_FUNCTION
:
1302 p
= "STATEMENT FUNCTION";
1304 case ST_LABEL_ASSIGNMENT
:
1305 p
= "LABEL ASSIGNMENT";
1308 p
= "ENUM DEFINITION";
1311 p
= "ENUMERATOR DEFINITION";
1319 case ST_OMP_BARRIER
:
1320 p
= "!$OMP BARRIER";
1322 case ST_OMP_CRITICAL
:
1323 p
= "!$OMP CRITICAL";
1328 case ST_OMP_END_CRITICAL
:
1329 p
= "!$OMP END CRITICAL";
1334 case ST_OMP_END_MASTER
:
1335 p
= "!$OMP END MASTER";
1337 case ST_OMP_END_ORDERED
:
1338 p
= "!$OMP END ORDERED";
1340 case ST_OMP_END_PARALLEL
:
1341 p
= "!$OMP END PARALLEL";
1343 case ST_OMP_END_PARALLEL_DO
:
1344 p
= "!$OMP END PARALLEL DO";
1346 case ST_OMP_END_PARALLEL_SECTIONS
:
1347 p
= "!$OMP END PARALLEL SECTIONS";
1349 case ST_OMP_END_PARALLEL_WORKSHARE
:
1350 p
= "!$OMP END PARALLEL WORKSHARE";
1352 case ST_OMP_END_SECTIONS
:
1353 p
= "!$OMP END SECTIONS";
1355 case ST_OMP_END_SINGLE
:
1356 p
= "!$OMP END SINGLE";
1358 case ST_OMP_END_TASK
:
1359 p
= "!$OMP END TASK";
1361 case ST_OMP_END_WORKSHARE
:
1362 p
= "!$OMP END WORKSHARE";
1370 case ST_OMP_ORDERED
:
1371 p
= "!$OMP ORDERED";
1373 case ST_OMP_PARALLEL
:
1374 p
= "!$OMP PARALLEL";
1376 case ST_OMP_PARALLEL_DO
:
1377 p
= "!$OMP PARALLEL DO";
1379 case ST_OMP_PARALLEL_SECTIONS
:
1380 p
= "!$OMP PARALLEL SECTIONS";
1382 case ST_OMP_PARALLEL_WORKSHARE
:
1383 p
= "!$OMP PARALLEL WORKSHARE";
1385 case ST_OMP_SECTIONS
:
1386 p
= "!$OMP SECTIONS";
1388 case ST_OMP_SECTION
:
1389 p
= "!$OMP SECTION";
1397 case ST_OMP_TASKWAIT
:
1398 p
= "!$OMP TASKWAIT";
1400 case ST_OMP_THREADPRIVATE
:
1401 p
= "!$OMP THREADPRIVATE";
1403 case ST_OMP_WORKSHARE
:
1404 p
= "!$OMP WORKSHARE";
1407 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1414 /* Create a symbol for the main program and assign it to ns->proc_name. */
1417 main_program_symbol (gfc_namespace
*ns
, const char *name
)
1419 gfc_symbol
*main_program
;
1420 symbol_attribute attr
;
1422 gfc_get_symbol (name
, ns
, &main_program
);
1423 gfc_clear_attr (&attr
);
1424 attr
.flavor
= FL_PROGRAM
;
1425 attr
.proc
= PROC_UNKNOWN
;
1426 attr
.subroutine
= 1;
1427 attr
.access
= ACCESS_PUBLIC
;
1428 attr
.is_main_program
= 1;
1429 main_program
->attr
= attr
;
1430 main_program
->declared_at
= gfc_current_locus
;
1431 ns
->proc_name
= main_program
;
1432 gfc_commit_symbols ();
1436 /* Do whatever is necessary to accept the last statement. */
1439 accept_statement (gfc_statement st
)
1447 case ST_IMPLICIT_NONE
:
1448 gfc_set_implicit_none ();
1457 gfc_current_ns
->proc_name
= gfc_new_block
;
1460 /* If the statement is the end of a block, lay down a special code
1461 that allows a branch to the end of the block from within the
1466 if (gfc_statement_label
!= NULL
)
1468 new_st
.op
= EXEC_NOP
;
1474 /* The end-of-program unit statements do not get the special
1475 marker and require a statement of some sort if they are a
1478 case ST_END_PROGRAM
:
1479 case ST_END_FUNCTION
:
1480 case ST_END_SUBROUTINE
:
1481 if (gfc_statement_label
!= NULL
)
1483 new_st
.op
= EXEC_RETURN
;
1499 gfc_commit_symbols ();
1500 gfc_warning_check ();
1501 gfc_clear_new_st ();
1505 /* Undo anything tentative that has been built for the current
1509 reject_statement (void)
1511 gfc_new_block
= NULL
;
1512 gfc_undo_symbols ();
1513 gfc_clear_warning ();
1514 undo_new_statement ();
1518 /* Generic complaint about an out of order statement. We also do
1519 whatever is necessary to clean up. */
1522 unexpected_statement (gfc_statement st
)
1524 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st
));
1526 reject_statement ();
1530 /* Given the next statement seen by the matcher, make sure that it is
1531 in proper order with the last. This subroutine is initialized by
1532 calling it with an argument of ST_NONE. If there is a problem, we
1533 issue an error and return FAILURE. Otherwise we return SUCCESS.
1535 Individual parsers need to verify that the statements seen are
1536 valid before calling here, i.e., ENTRY statements are not allowed in
1537 INTERFACE blocks. The following diagram is taken from the standard:
1539 +---------------------------------------+
1540 | program subroutine function module |
1541 +---------------------------------------+
1543 +---------------------------------------+
1545 +---------------------------------------+
1547 | +-----------+------------------+
1548 | | parameter | implicit |
1549 | +-----------+------------------+
1550 | format | | derived type |
1551 | entry | parameter | interface |
1552 | | data | specification |
1553 | | | statement func |
1554 | +-----------+------------------+
1555 | | data | executable |
1556 +--------+-----------+------------------+
1558 +---------------------------------------+
1559 | internal module/subprogram |
1560 +---------------------------------------+
1562 +---------------------------------------+
1569 { ORDER_START
, ORDER_USE
, ORDER_IMPORT
, ORDER_IMPLICIT_NONE
,
1570 ORDER_IMPLICIT
, ORDER_SPEC
, ORDER_EXEC
1573 gfc_statement last_statement
;
1579 verify_st_order (st_state
*p
, gfc_statement st
, bool silent
)
1585 p
->state
= ORDER_START
;
1589 if (p
->state
> ORDER_USE
)
1591 p
->state
= ORDER_USE
;
1595 if (p
->state
> ORDER_IMPORT
)
1597 p
->state
= ORDER_IMPORT
;
1600 case ST_IMPLICIT_NONE
:
1601 if (p
->state
> ORDER_IMPLICIT_NONE
)
1604 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1605 statement disqualifies a USE but not an IMPLICIT NONE.
1606 Duplicate IMPLICIT NONEs are caught when the implicit types
1609 p
->state
= ORDER_IMPLICIT_NONE
;
1613 if (p
->state
> ORDER_IMPLICIT
)
1615 p
->state
= ORDER_IMPLICIT
;
1620 if (p
->state
< ORDER_IMPLICIT_NONE
)
1621 p
->state
= ORDER_IMPLICIT_NONE
;
1625 if (p
->state
>= ORDER_EXEC
)
1627 if (p
->state
< ORDER_IMPLICIT
)
1628 p
->state
= ORDER_IMPLICIT
;
1632 if (p
->state
< ORDER_SPEC
)
1633 p
->state
= ORDER_SPEC
;
1638 case ST_DERIVED_DECL
:
1640 if (p
->state
>= ORDER_EXEC
)
1642 if (p
->state
< ORDER_SPEC
)
1643 p
->state
= ORDER_SPEC
;
1648 if (p
->state
< ORDER_EXEC
)
1649 p
->state
= ORDER_EXEC
;
1653 gfc_internal_error ("Unexpected %s statement in verify_st_order() at %C",
1654 gfc_ascii_statement (st
));
1657 /* All is well, record the statement in case we need it next time. */
1658 p
->where
= gfc_current_locus
;
1659 p
->last_statement
= st
;
1664 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1665 gfc_ascii_statement (st
),
1666 gfc_ascii_statement (p
->last_statement
), &p
->where
);
1672 /* Handle an unexpected end of file. This is a show-stopper... */
1674 static void unexpected_eof (void) ATTRIBUTE_NORETURN
;
1677 unexpected_eof (void)
1681 gfc_error ("Unexpected end of file in '%s'", gfc_source_file
);
1683 /* Memory cleanup. Move to "second to last". */
1684 for (p
= gfc_state_stack
; p
&& p
->previous
&& p
->previous
->previous
;
1687 gfc_current_ns
->code
= (p
&& p
->previous
) ? p
->head
: NULL
;
1690 longjmp (eof_buf
, 1);
1694 /* Parse a derived type. */
1697 parse_derived (void)
1699 int compiling_type
, seen_private
, seen_sequence
, seen_component
, error_flag
;
1700 int seen_contains
, seen_contains_comp
;
1703 gfc_symbol
*derived_sym
= NULL
;
1709 accept_statement (ST_DERIVED_DECL
);
1710 push_state (&s
, COMP_DERIVED
, gfc_new_block
);
1712 gfc_new_block
->component_access
= ACCESS_PUBLIC
;
1717 seen_contains_comp
= 0;
1721 while (compiling_type
)
1723 st
= next_statement ();
1733 gfc_error ("Components in TYPE at %C must precede CONTAINS");
1737 accept_statement (st
);
1744 gfc_error ("FINAL declaration at %C must be inside CONTAINS");
1748 if (gfc_notify_std (GFC_STD_F2003
,
1749 "Fortran 2003: FINAL procedure declaration"
1750 " at %C") == FAILURE
)
1753 accept_statement (ST_FINAL
);
1754 seen_contains_comp
= 1;
1761 && (gfc_notify_std (GFC_STD_F2003
, "Fortran 2003: Derived type "
1762 "definition at %C without components")
1766 if (seen_contains
&& !seen_contains_comp
1767 && (gfc_notify_std (GFC_STD_F2008
, "Fortran 2008: Derived type "
1768 "definition at %C with empty CONTAINS "
1769 "section") == FAILURE
))
1772 accept_statement (ST_END_TYPE
);
1778 gfc_error ("PRIVATE statement at %C must precede CONTAINS");
1782 if (gfc_find_state (COMP_MODULE
) == FAILURE
)
1784 gfc_error ("PRIVATE statement in TYPE at %C must be inside "
1792 gfc_error ("PRIVATE statement at %C must precede "
1793 "structure components");
1800 gfc_error ("Duplicate PRIVATE statement at %C");
1804 s
.sym
->component_access
= ACCESS_PRIVATE
;
1805 accept_statement (ST_PRIVATE
);
1812 gfc_error ("SEQUENCE statement at %C must precede CONTAINS");
1818 gfc_error ("SEQUENCE statement at %C must precede "
1819 "structure components");
1824 if (gfc_current_block ()->attr
.sequence
)
1825 gfc_warning ("SEQUENCE attribute at %C already specified in "
1830 gfc_error ("Duplicate SEQUENCE statement at %C");
1835 gfc_add_sequence (&gfc_current_block ()->attr
,
1836 gfc_current_block ()->name
, NULL
);
1840 if (gfc_notify_std (GFC_STD_F2003
,
1841 "Fortran 2003: CONTAINS block in derived type"
1842 " definition at %C") == FAILURE
)
1847 gfc_error ("Already inside a CONTAINS block at %C");
1852 accept_statement (ST_CONTAINS
);
1856 unexpected_statement (st
);
1861 /* need to verify that all fields of the derived type are
1862 * interoperable with C if the type is declared to be bind(c)
1864 derived_sym
= gfc_current_block();
1866 sym
= gfc_current_block ();
1867 for (c
= sym
->components
; c
; c
= c
->next
)
1869 /* Look for allocatable components. */
1870 if (c
->attr
.allocatable
1871 || (c
->ts
.type
== BT_DERIVED
&& c
->ts
.derived
->attr
.alloc_comp
))
1873 sym
->attr
.alloc_comp
= 1;
1877 /* Look for pointer components. */
1879 || (c
->ts
.type
== BT_DERIVED
&& c
->ts
.derived
->attr
.pointer_comp
))
1881 sym
->attr
.pointer_comp
= 1;
1885 /* Look for private components. */
1886 if (sym
->component_access
== ACCESS_PRIVATE
1887 || c
->attr
.access
== ACCESS_PRIVATE
1888 || (c
->ts
.type
== BT_DERIVED
&& c
->ts
.derived
->attr
.private_comp
))
1890 sym
->attr
.private_comp
= 1;
1895 if (!seen_component
)
1896 sym
->attr
.zero_comp
= 1;
1902 /* Parse an ENUM. */
1911 int seen_enumerator
= 0;
1915 push_state (&s
, COMP_ENUM
, gfc_new_block
);
1919 while (compiling_enum
)
1921 st
= next_statement ();
1929 seen_enumerator
= 1;
1930 accept_statement (st
);
1935 if (!seen_enumerator
)
1937 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
1940 accept_statement (st
);
1944 gfc_free_enum_history ();
1945 unexpected_statement (st
);
1953 /* Parse an interface. We must be able to deal with the possibility
1954 of recursive interfaces. The parse_spec() subroutine is mutually
1955 recursive with parse_interface(). */
1957 static gfc_statement
parse_spec (gfc_statement
);
1960 parse_interface (void)
1962 gfc_compile_state new_state
, current_state
;
1963 gfc_symbol
*prog_unit
, *sym
;
1964 gfc_interface_info save
;
1965 gfc_state_data s1
, s2
;
1969 accept_statement (ST_INTERFACE
);
1971 current_interface
.ns
= gfc_current_ns
;
1972 save
= current_interface
;
1974 sym
= (current_interface
.type
== INTERFACE_GENERIC
1975 || current_interface
.type
== INTERFACE_USER_OP
)
1976 ? gfc_new_block
: NULL
;
1978 push_state (&s1
, COMP_INTERFACE
, sym
);
1979 current_state
= COMP_NONE
;
1982 gfc_current_ns
= gfc_get_namespace (current_interface
.ns
, 0);
1984 st
= next_statement ();
1992 if (st
== ST_SUBROUTINE
)
1993 new_state
= COMP_SUBROUTINE
;
1994 else if (st
== ST_FUNCTION
)
1995 new_state
= COMP_FUNCTION
;
1996 if (gfc_new_block
->attr
.pointer
)
1998 gfc_new_block
->attr
.pointer
= 0;
1999 gfc_new_block
->attr
.proc_pointer
= 1;
2001 if (gfc_add_explicit_interface (gfc_new_block
, IFSRC_IFBODY
,
2002 gfc_new_block
->formal
, NULL
) == FAILURE
)
2004 reject_statement ();
2005 gfc_free_namespace (gfc_current_ns
);
2008 if (current_interface
.type
!= INTERFACE_ABSTRACT
&&
2009 !gfc_new_block
->attr
.dummy
&&
2010 gfc_add_external (&gfc_new_block
->attr
, &gfc_current_locus
) == FAILURE
)
2012 reject_statement ();
2013 gfc_free_namespace (gfc_current_ns
);
2019 case ST_MODULE_PROC
: /* The module procedure matcher makes
2020 sure the context is correct. */
2021 accept_statement (st
);
2022 gfc_free_namespace (gfc_current_ns
);
2025 case ST_END_INTERFACE
:
2026 gfc_free_namespace (gfc_current_ns
);
2027 gfc_current_ns
= current_interface
.ns
;
2031 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
2032 gfc_ascii_statement (st
));
2033 reject_statement ();
2034 gfc_free_namespace (gfc_current_ns
);
2039 /* Make sure that a generic interface has only subroutines or
2040 functions and that the generic name has the right attribute. */
2041 if (current_interface
.type
== INTERFACE_GENERIC
)
2043 if (current_state
== COMP_NONE
)
2045 if (new_state
== COMP_FUNCTION
)
2046 gfc_add_function (&sym
->attr
, sym
->name
, NULL
);
2047 else if (new_state
== COMP_SUBROUTINE
)
2048 gfc_add_subroutine (&sym
->attr
, sym
->name
, NULL
);
2050 current_state
= new_state
;
2054 if (new_state
!= current_state
)
2056 if (new_state
== COMP_SUBROUTINE
)
2057 gfc_error ("SUBROUTINE at %C does not belong in a "
2058 "generic function interface");
2060 if (new_state
== COMP_FUNCTION
)
2061 gfc_error ("FUNCTION at %C does not belong in a "
2062 "generic subroutine interface");
2067 if (current_interface
.type
== INTERFACE_ABSTRACT
)
2069 gfc_new_block
->attr
.abstract
= 1;
2070 if (gfc_is_intrinsic_typename (gfc_new_block
->name
))
2071 gfc_error ("Name '%s' of ABSTRACT INTERFACE at %C "
2072 "cannot be the same as an intrinsic type",
2073 gfc_new_block
->name
);
2076 push_state (&s2
, new_state
, gfc_new_block
);
2077 accept_statement (st
);
2078 prog_unit
= gfc_new_block
;
2079 prog_unit
->formal_ns
= gfc_current_ns
;
2080 proc_locus
= gfc_current_locus
;
2083 /* Read data declaration statements. */
2084 st
= parse_spec (ST_NONE
);
2086 /* Since the interface block does not permit an IMPLICIT statement,
2087 the default type for the function or the result must be taken
2088 from the formal namespace. */
2089 if (new_state
== COMP_FUNCTION
)
2091 if (prog_unit
->result
== prog_unit
2092 && prog_unit
->ts
.type
== BT_UNKNOWN
)
2093 gfc_set_default_type (prog_unit
, 1, prog_unit
->formal_ns
);
2094 else if (prog_unit
->result
!= prog_unit
2095 && prog_unit
->result
->ts
.type
== BT_UNKNOWN
)
2096 gfc_set_default_type (prog_unit
->result
, 1,
2097 prog_unit
->formal_ns
);
2100 if (st
!= ST_END_SUBROUTINE
&& st
!= ST_END_FUNCTION
)
2102 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
2103 gfc_ascii_statement (st
));
2104 reject_statement ();
2108 current_interface
= save
;
2109 gfc_add_interface (prog_unit
);
2112 if (current_interface
.ns
2113 && current_interface
.ns
->proc_name
2114 && strcmp (current_interface
.ns
->proc_name
->name
,
2115 prog_unit
->name
) == 0)
2116 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
2117 "enclosing procedure", prog_unit
->name
, &proc_locus
);
2126 /* Associate function characteristics by going back to the function
2127 declaration and rematching the prefix. */
2130 match_deferred_characteristics (gfc_typespec
* ts
)
2133 match m
= MATCH_ERROR
;
2134 char name
[GFC_MAX_SYMBOL_LEN
+ 1];
2136 loc
= gfc_current_locus
;
2138 gfc_current_locus
= gfc_current_block ()->declared_at
;
2141 gfc_buffer_error (1);
2142 m
= gfc_match_prefix (ts
);
2143 gfc_buffer_error (0);
2145 if (ts
->type
== BT_DERIVED
)
2149 if (!ts
->derived
|| !ts
->derived
->components
)
2153 /* Only permit one go at the characteristic association. */
2157 /* Set the function locus correctly. If we have not found the
2158 function name, there is an error. */
2159 gfc_match ("function% %n", name
);
2160 if (m
== MATCH_YES
&& strcmp (name
, gfc_current_block ()->name
) == 0)
2162 gfc_current_block ()->declared_at
= gfc_current_locus
;
2163 gfc_commit_symbols ();
2168 gfc_current_locus
=loc
;
2173 /* Check specification-expressions in the function result of the currently
2174 parsed block and ensure they are typed (give an IMPLICIT type if necessary).
2175 For return types specified in a FUNCTION prefix, the IMPLICIT rules of the
2176 scope are not yet parsed so this has to be delayed up to parse_spec. */
2179 check_function_result_typed (void)
2181 gfc_typespec
* ts
= &gfc_current_ns
->proc_name
->result
->ts
;
2183 gcc_assert (gfc_current_state () == COMP_FUNCTION
);
2184 gcc_assert (ts
->type
!= BT_UNKNOWN
);
2186 /* Check type-parameters, at the moment only CHARACTER lengths possible. */
2187 /* TODO: Extend when KIND type parameters are implemented. */
2188 if (ts
->type
== BT_CHARACTER
&& ts
->cl
&& ts
->cl
->length
)
2189 gfc_expr_check_typed (ts
->cl
->length
, gfc_current_ns
, true);
2193 /* Parse a set of specification statements. Returns the statement
2194 that doesn't fit. */
2196 static gfc_statement
2197 parse_spec (gfc_statement st
)
2200 bool function_result_typed
= false;
2201 bool bad_characteristic
= false;
2204 verify_st_order (&ss
, ST_NONE
, false);
2206 st
= next_statement ();
2208 /* If we are not inside a function or don't have a result specified so far,
2209 do nothing special about it. */
2210 if (gfc_current_state () != COMP_FUNCTION
)
2211 function_result_typed
= true;
2214 gfc_symbol
* proc
= gfc_current_ns
->proc_name
;
2217 if (proc
->result
->ts
.type
== BT_UNKNOWN
)
2218 function_result_typed
= true;
2223 /* If we find a statement that can not be followed by an IMPLICIT statement
2224 (and thus we can expect to see none any further), type the function result
2225 if it has not yet been typed. Be careful not to give the END statement
2226 to verify_st_order! */
2227 if (!function_result_typed
&& st
!= ST_GET_FCN_CHARACTERISTICS
)
2229 bool verify_now
= false;
2231 if (st
== ST_END_FUNCTION
)
2236 verify_st_order (&dummyss
, ST_NONE
, false);
2237 verify_st_order (&dummyss
, st
, false);
2239 if (verify_st_order (&dummyss
, ST_IMPLICIT
, true) == FAILURE
)
2245 check_function_result_typed ();
2246 function_result_typed
= true;
2255 case ST_IMPLICIT_NONE
:
2257 if (!function_result_typed
)
2259 check_function_result_typed ();
2260 function_result_typed
= true;
2266 case ST_DATA
: /* Not allowed in interfaces */
2267 if (gfc_current_state () == COMP_INTERFACE
)
2277 case ST_DERIVED_DECL
:
2280 if (verify_st_order (&ss
, st
, false) == FAILURE
)
2282 reject_statement ();
2283 st
= next_statement ();
2293 case ST_DERIVED_DECL
:
2299 if (gfc_current_state () != COMP_MODULE
)
2301 gfc_error ("%s statement must appear in a MODULE",
2302 gfc_ascii_statement (st
));
2306 if (gfc_current_ns
->default_access
!= ACCESS_UNKNOWN
)
2308 gfc_error ("%s statement at %C follows another accessibility "
2309 "specification", gfc_ascii_statement (st
));
2313 gfc_current_ns
->default_access
= (st
== ST_PUBLIC
)
2314 ? ACCESS_PUBLIC
: ACCESS_PRIVATE
;
2318 case ST_STATEMENT_FUNCTION
:
2319 if (gfc_current_state () == COMP_MODULE
)
2321 unexpected_statement (st
);
2329 accept_statement (st
);
2330 st
= next_statement ();
2334 accept_statement (st
);
2336 st
= next_statement ();
2339 case ST_GET_FCN_CHARACTERISTICS
:
2340 /* This statement triggers the association of a function's result
2342 ts
= &gfc_current_block ()->result
->ts
;
2343 if (match_deferred_characteristics (ts
) != MATCH_YES
)
2344 bad_characteristic
= true;
2346 st
= next_statement ();
2353 /* If match_deferred_characteristics failed, then there is an error. */
2354 if (bad_characteristic
)
2356 ts
= &gfc_current_block ()->result
->ts
;
2357 if (ts
->type
!= BT_DERIVED
)
2358 gfc_error ("Bad kind expression for function '%s' at %L",
2359 gfc_current_block ()->name
,
2360 &gfc_current_block ()->declared_at
);
2362 gfc_error ("The type for function '%s' at %L is not accessible",
2363 gfc_current_block ()->name
,
2364 &gfc_current_block ()->declared_at
);
2366 gfc_current_block ()->ts
.kind
= 0;
2367 /* Keep the derived type; if it's bad, it will be discovered later. */
2368 if (!(ts
->type
== BT_DERIVED
&& ts
->derived
))
2369 ts
->type
= BT_UNKNOWN
;
2376 /* Parse a WHERE block, (not a simple WHERE statement). */
2379 parse_where_block (void)
2381 int seen_empty_else
;
2386 accept_statement (ST_WHERE_BLOCK
);
2387 top
= gfc_state_stack
->tail
;
2389 push_state (&s
, COMP_WHERE
, gfc_new_block
);
2391 d
= add_statement ();
2392 d
->expr
= top
->expr
;
2398 seen_empty_else
= 0;
2402 st
= next_statement ();
2408 case ST_WHERE_BLOCK
:
2409 parse_where_block ();
2414 accept_statement (st
);
2418 if (seen_empty_else
)
2420 gfc_error ("ELSEWHERE statement at %C follows previous "
2421 "unmasked ELSEWHERE");
2425 if (new_st
.expr
== NULL
)
2426 seen_empty_else
= 1;
2428 d
= new_level (gfc_state_stack
->head
);
2430 d
->expr
= new_st
.expr
;
2432 accept_statement (st
);
2437 accept_statement (st
);
2441 gfc_error ("Unexpected %s statement in WHERE block at %C",
2442 gfc_ascii_statement (st
));
2443 reject_statement ();
2447 while (st
!= ST_END_WHERE
);
2453 /* Parse a FORALL block (not a simple FORALL statement). */
2456 parse_forall_block (void)
2462 accept_statement (ST_FORALL_BLOCK
);
2463 top
= gfc_state_stack
->tail
;
2465 push_state (&s
, COMP_FORALL
, gfc_new_block
);
2467 d
= add_statement ();
2468 d
->op
= EXEC_FORALL
;
2473 st
= next_statement ();
2478 case ST_POINTER_ASSIGNMENT
:
2481 accept_statement (st
);
2484 case ST_WHERE_BLOCK
:
2485 parse_where_block ();
2488 case ST_FORALL_BLOCK
:
2489 parse_forall_block ();
2493 accept_statement (st
);
2500 gfc_error ("Unexpected %s statement in FORALL block at %C",
2501 gfc_ascii_statement (st
));
2503 reject_statement ();
2507 while (st
!= ST_END_FORALL
);
2513 static gfc_statement
parse_executable (gfc_statement
);
2515 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2518 parse_if_block (void)
2527 accept_statement (ST_IF_BLOCK
);
2529 top
= gfc_state_stack
->tail
;
2530 push_state (&s
, COMP_IF
, gfc_new_block
);
2532 new_st
.op
= EXEC_IF
;
2533 d
= add_statement ();
2535 d
->expr
= top
->expr
;
2541 st
= parse_executable (ST_NONE
);
2551 gfc_error ("ELSE IF statement at %C cannot follow ELSE "
2552 "statement at %L", &else_locus
);
2554 reject_statement ();
2558 d
= new_level (gfc_state_stack
->head
);
2560 d
->expr
= new_st
.expr
;
2562 accept_statement (st
);
2569 gfc_error ("Duplicate ELSE statements at %L and %C",
2571 reject_statement ();
2576 else_locus
= gfc_current_locus
;
2578 d
= new_level (gfc_state_stack
->head
);
2581 accept_statement (st
);
2589 unexpected_statement (st
);
2593 while (st
!= ST_ENDIF
);
2596 accept_statement (st
);
2600 /* Parse a SELECT block. */
2603 parse_select_block (void)
2609 accept_statement (ST_SELECT_CASE
);
2611 cp
= gfc_state_stack
->tail
;
2612 push_state (&s
, COMP_SELECT
, gfc_new_block
);
2614 /* Make sure that the next statement is a CASE or END SELECT. */
2617 st
= next_statement ();
2620 if (st
== ST_END_SELECT
)
2622 /* Empty SELECT CASE is OK. */
2623 accept_statement (st
);
2630 gfc_error ("Expected a CASE or END SELECT statement following SELECT "
2633 reject_statement ();
2636 /* At this point, we're got a nonempty select block. */
2637 cp
= new_level (cp
);
2640 accept_statement (st
);
2644 st
= parse_executable (ST_NONE
);
2651 cp
= new_level (gfc_state_stack
->head
);
2653 gfc_clear_new_st ();
2655 accept_statement (st
);
2661 /* Can't have an executable statement because of
2662 parse_executable(). */
2664 unexpected_statement (st
);
2668 while (st
!= ST_END_SELECT
);
2671 accept_statement (st
);
2675 /* Given a symbol, make sure it is not an iteration variable for a DO
2676 statement. This subroutine is called when the symbol is seen in a
2677 context that causes it to become redefined. If the symbol is an
2678 iterator, we generate an error message and return nonzero. */
2681 gfc_check_do_variable (gfc_symtree
*st
)
2685 for (s
=gfc_state_stack
; s
; s
= s
->previous
)
2686 if (s
->do_variable
== st
)
2688 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2689 "loop beginning at %L", st
->name
, &s
->head
->loc
);
2697 /* Checks to see if the current statement label closes an enddo.
2698 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2699 an error) if it incorrectly closes an ENDDO. */
2702 check_do_closure (void)
2706 if (gfc_statement_label
== NULL
)
2709 for (p
= gfc_state_stack
; p
; p
= p
->previous
)
2710 if (p
->state
== COMP_DO
)
2714 return 0; /* No loops to close */
2716 if (p
->ext
.end_do_label
== gfc_statement_label
)
2719 if (p
== gfc_state_stack
)
2722 gfc_error ("End of nonblock DO statement at %C is within another block");
2726 /* At this point, the label doesn't terminate the innermost loop.
2727 Make sure it doesn't terminate another one. */
2728 for (; p
; p
= p
->previous
)
2729 if (p
->state
== COMP_DO
&& p
->ext
.end_do_label
== gfc_statement_label
)
2731 gfc_error ("End of nonblock DO statement at %C is interwoven "
2732 "with another DO loop");
2740 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2741 handled inside of parse_executable(), because they aren't really
2745 parse_do_block (void)
2752 s
.ext
.end_do_label
= new_st
.label
;
2754 if (new_st
.ext
.iterator
!= NULL
)
2755 stree
= new_st
.ext
.iterator
->var
->symtree
;
2759 accept_statement (ST_DO
);
2761 top
= gfc_state_stack
->tail
;
2762 push_state (&s
, COMP_DO
, gfc_new_block
);
2764 s
.do_variable
= stree
;
2766 top
->block
= new_level (top
);
2767 top
->block
->op
= EXEC_DO
;
2770 st
= parse_executable (ST_NONE
);
2778 if (s
.ext
.end_do_label
!= NULL
2779 && s
.ext
.end_do_label
!= gfc_statement_label
)
2780 gfc_error_now ("Statement label in ENDDO at %C doesn't match "
2783 if (gfc_statement_label
!= NULL
)
2785 new_st
.op
= EXEC_NOP
;
2790 case ST_IMPLIED_ENDDO
:
2791 /* If the do-stmt of this DO construct has a do-construct-name,
2792 the corresponding end-do must be an end-do-stmt (with a matching
2793 name, but in that case we must have seen ST_ENDDO first).
2794 We only complain about this in pedantic mode. */
2795 if (gfc_current_block () != NULL
)
2796 gfc_error_now ("named block DO at %L requires matching ENDDO name",
2797 &gfc_current_block()->declared_at
);
2802 unexpected_statement (st
);
2807 accept_statement (st
);
2811 /* Parse the statements of OpenMP do/parallel do. */
2813 static gfc_statement
2814 parse_omp_do (gfc_statement omp_st
)
2820 accept_statement (omp_st
);
2822 cp
= gfc_state_stack
->tail
;
2823 push_state (&s
, COMP_OMP_STRUCTURED_BLOCK
, NULL
);
2824 np
= new_level (cp
);
2830 st
= next_statement ();
2833 else if (st
== ST_DO
)
2836 unexpected_statement (st
);
2840 if (gfc_statement_label
!= NULL
2841 && gfc_state_stack
->previous
!= NULL
2842 && gfc_state_stack
->previous
->state
== COMP_DO
2843 && gfc_state_stack
->previous
->ext
.end_do_label
== gfc_statement_label
)
2851 there should be no !$OMP END DO. */
2853 return ST_IMPLIED_ENDDO
;
2856 check_do_closure ();
2859 st
= next_statement ();
2860 if (st
== (omp_st
== ST_OMP_DO
? ST_OMP_END_DO
: ST_OMP_END_PARALLEL_DO
))
2862 if (new_st
.op
== EXEC_OMP_END_NOWAIT
)
2863 cp
->ext
.omp_clauses
->nowait
|= new_st
.ext
.omp_bool
;
2865 gcc_assert (new_st
.op
== EXEC_NOP
);
2866 gfc_clear_new_st ();
2867 gfc_commit_symbols ();
2868 gfc_warning_check ();
2869 st
= next_statement ();
2875 /* Parse the statements of OpenMP atomic directive. */
2878 parse_omp_atomic (void)
2884 accept_statement (ST_OMP_ATOMIC
);
2886 cp
= gfc_state_stack
->tail
;
2887 push_state (&s
, COMP_OMP_STRUCTURED_BLOCK
, NULL
);
2888 np
= new_level (cp
);
2894 st
= next_statement ();
2897 else if (st
== ST_ASSIGNMENT
)
2900 unexpected_statement (st
);
2903 accept_statement (st
);
2909 /* Parse the statements of an OpenMP structured block. */
2912 parse_omp_structured_block (gfc_statement omp_st
, bool workshare_stmts_only
)
2914 gfc_statement st
, omp_end_st
;
2918 accept_statement (omp_st
);
2920 cp
= gfc_state_stack
->tail
;
2921 push_state (&s
, COMP_OMP_STRUCTURED_BLOCK
, NULL
);
2922 np
= new_level (cp
);
2928 case ST_OMP_PARALLEL
:
2929 omp_end_st
= ST_OMP_END_PARALLEL
;
2931 case ST_OMP_PARALLEL_SECTIONS
:
2932 omp_end_st
= ST_OMP_END_PARALLEL_SECTIONS
;
2934 case ST_OMP_SECTIONS
:
2935 omp_end_st
= ST_OMP_END_SECTIONS
;
2937 case ST_OMP_ORDERED
:
2938 omp_end_st
= ST_OMP_END_ORDERED
;
2940 case ST_OMP_CRITICAL
:
2941 omp_end_st
= ST_OMP_END_CRITICAL
;
2944 omp_end_st
= ST_OMP_END_MASTER
;
2947 omp_end_st
= ST_OMP_END_SINGLE
;
2950 omp_end_st
= ST_OMP_END_TASK
;
2952 case ST_OMP_WORKSHARE
:
2953 omp_end_st
= ST_OMP_END_WORKSHARE
;
2955 case ST_OMP_PARALLEL_WORKSHARE
:
2956 omp_end_st
= ST_OMP_END_PARALLEL_WORKSHARE
;
2964 if (workshare_stmts_only
)
2966 /* Inside of !$omp workshare, only
2969 where statements and constructs
2970 forall statements and constructs
2974 are allowed. For !$omp critical these
2975 restrictions apply recursively. */
2978 st
= next_statement ();
2989 accept_statement (st
);
2992 case ST_WHERE_BLOCK
:
2993 parse_where_block ();
2996 case ST_FORALL_BLOCK
:
2997 parse_forall_block ();
3000 case ST_OMP_PARALLEL
:
3001 case ST_OMP_PARALLEL_SECTIONS
:
3002 parse_omp_structured_block (st
, false);
3005 case ST_OMP_PARALLEL_WORKSHARE
:
3006 case ST_OMP_CRITICAL
:
3007 parse_omp_structured_block (st
, true);
3010 case ST_OMP_PARALLEL_DO
:
3011 st
= parse_omp_do (st
);
3015 parse_omp_atomic ();
3026 st
= next_statement ();
3030 st
= parse_executable (ST_NONE
);
3033 else if (st
== ST_OMP_SECTION
3034 && (omp_st
== ST_OMP_SECTIONS
3035 || omp_st
== ST_OMP_PARALLEL_SECTIONS
))
3037 np
= new_level (np
);
3041 else if (st
!= omp_end_st
)
3042 unexpected_statement (st
);
3044 while (st
!= omp_end_st
);
3048 case EXEC_OMP_END_NOWAIT
:
3049 cp
->ext
.omp_clauses
->nowait
|= new_st
.ext
.omp_bool
;
3051 case EXEC_OMP_CRITICAL
:
3052 if (((cp
->ext
.omp_name
== NULL
) ^ (new_st
.ext
.omp_name
== NULL
))
3053 || (new_st
.ext
.omp_name
!= NULL
3054 && strcmp (cp
->ext
.omp_name
, new_st
.ext
.omp_name
) != 0))
3055 gfc_error ("Name after !$omp critical and !$omp end critical does "
3057 gfc_free (CONST_CAST (char *, new_st
.ext
.omp_name
));
3059 case EXEC_OMP_END_SINGLE
:
3060 cp
->ext
.omp_clauses
->lists
[OMP_LIST_COPYPRIVATE
]
3061 = new_st
.ext
.omp_clauses
->lists
[OMP_LIST_COPYPRIVATE
];
3062 new_st
.ext
.omp_clauses
->lists
[OMP_LIST_COPYPRIVATE
] = NULL
;
3063 gfc_free_omp_clauses (new_st
.ext
.omp_clauses
);
3071 gfc_clear_new_st ();
3072 gfc_commit_symbols ();
3073 gfc_warning_check ();
3078 /* Accept a series of executable statements. We return the first
3079 statement that doesn't fit to the caller. Any block statements are
3080 passed on to the correct handler, which usually passes the buck
3083 static gfc_statement
3084 parse_executable (gfc_statement st
)
3089 st
= next_statement ();
3093 close_flag
= check_do_closure ();
3098 case ST_END_PROGRAM
:
3101 case ST_END_FUNCTION
:
3105 case ST_END_SUBROUTINE
:
3110 case ST_SELECT_CASE
:
3111 gfc_error ("%s statement at %C cannot terminate a non-block "
3112 "DO loop", gfc_ascii_statement (st
));
3128 accept_statement (st
);
3129 if (close_flag
== 1)
3130 return ST_IMPLIED_ENDDO
;
3137 case ST_SELECT_CASE
:
3138 parse_select_block ();
3143 if (check_do_closure () == 1)
3144 return ST_IMPLIED_ENDDO
;
3147 case ST_WHERE_BLOCK
:
3148 parse_where_block ();
3151 case ST_FORALL_BLOCK
:
3152 parse_forall_block ();
3155 case ST_OMP_PARALLEL
:
3156 case ST_OMP_PARALLEL_SECTIONS
:
3157 case ST_OMP_SECTIONS
:
3158 case ST_OMP_ORDERED
:
3159 case ST_OMP_CRITICAL
:
3163 parse_omp_structured_block (st
, false);
3166 case ST_OMP_WORKSHARE
:
3167 case ST_OMP_PARALLEL_WORKSHARE
:
3168 parse_omp_structured_block (st
, true);
3172 case ST_OMP_PARALLEL_DO
:
3173 st
= parse_omp_do (st
);
3174 if (st
== ST_IMPLIED_ENDDO
)
3179 parse_omp_atomic ();
3186 st
= next_statement ();
3191 /* Parse a series of contained program units. */
3193 static void parse_progunit (gfc_statement
);
3196 /* Fix the symbols for sibling functions. These are incorrectly added to
3197 the child namespace as the parser didn't know about this procedure. */
3200 gfc_fixup_sibling_symbols (gfc_symbol
*sym
, gfc_namespace
*siblings
)
3204 gfc_symbol
*old_sym
;
3206 sym
->attr
.referenced
= 1;
3207 for (ns
= siblings
; ns
; ns
= ns
->sibling
)
3209 gfc_find_sym_tree (sym
->name
, ns
, 0, &st
);
3211 if (!st
|| (st
->n
.sym
->attr
.dummy
&& ns
== st
->n
.sym
->ns
))
3214 old_sym
= st
->n
.sym
;
3215 if (old_sym
->ns
== ns
3216 && !old_sym
->attr
.contained
3218 /* By 14.6.1.3, host association should be excluded
3219 for the following. */
3220 && !(old_sym
->attr
.external
3221 || (old_sym
->ts
.type
!= BT_UNKNOWN
3222 && !old_sym
->attr
.implicit_type
)
3223 || old_sym
->attr
.flavor
== FL_PARAMETER
3224 || old_sym
->attr
.in_common
3225 || old_sym
->attr
.in_equivalence
3226 || old_sym
->attr
.data
3227 || old_sym
->attr
.dummy
3228 || old_sym
->attr
.result
3229 || old_sym
->attr
.dimension
3230 || old_sym
->attr
.allocatable
3231 || old_sym
->attr
.intrinsic
3232 || old_sym
->attr
.generic
3233 || old_sym
->attr
.flavor
== FL_NAMELIST
3234 || old_sym
->attr
.proc
== PROC_ST_FUNCTION
))
3236 /* Replace it with the symbol from the parent namespace. */
3240 /* Free the old (local) symbol. */
3242 if (old_sym
->refs
== 0)
3243 gfc_free_symbol (old_sym
);
3246 /* Do the same for any contained procedures. */
3247 gfc_fixup_sibling_symbols (sym
, ns
->contained
);
3252 parse_contained (int module
)
3254 gfc_namespace
*ns
, *parent_ns
, *tmp
;
3255 gfc_state_data s1
, s2
;
3259 int contains_statements
= 0;
3262 push_state (&s1
, COMP_CONTAINS
, NULL
);
3263 parent_ns
= gfc_current_ns
;
3267 gfc_current_ns
= gfc_get_namespace (parent_ns
, 1);
3269 gfc_current_ns
->sibling
= parent_ns
->contained
;
3270 parent_ns
->contained
= gfc_current_ns
;
3273 /* Process the next available statement. We come here if we got an error
3274 and rejected the last statement. */
3275 st
= next_statement ();
3284 contains_statements
= 1;
3285 accept_statement (st
);
3288 (st
== ST_FUNCTION
) ? COMP_FUNCTION
: COMP_SUBROUTINE
,
3291 /* For internal procedures, create/update the symbol in the
3292 parent namespace. */
3296 if (gfc_get_symbol (gfc_new_block
->name
, parent_ns
, &sym
))
3297 gfc_error ("Contained procedure '%s' at %C is already "
3298 "ambiguous", gfc_new_block
->name
);
3301 if (gfc_add_procedure (&sym
->attr
, PROC_INTERNAL
, sym
->name
,
3302 &gfc_new_block
->declared_at
) ==
3305 if (st
== ST_FUNCTION
)
3306 gfc_add_function (&sym
->attr
, sym
->name
,
3307 &gfc_new_block
->declared_at
);
3309 gfc_add_subroutine (&sym
->attr
, sym
->name
,
3310 &gfc_new_block
->declared_at
);
3314 gfc_commit_symbols ();
3317 sym
= gfc_new_block
;
3319 /* Mark this as a contained function, so it isn't replaced
3320 by other module functions. */
3321 sym
->attr
.contained
= 1;
3322 sym
->attr
.referenced
= 1;
3324 parse_progunit (ST_NONE
);
3326 /* Fix up any sibling functions that refer to this one. */
3327 gfc_fixup_sibling_symbols (sym
, gfc_current_ns
);
3328 /* Or refer to any of its alternate entry points. */
3329 for (el
= gfc_current_ns
->entries
; el
; el
= el
->next
)
3330 gfc_fixup_sibling_symbols (el
->sym
, gfc_current_ns
);
3332 gfc_current_ns
->code
= s2
.head
;
3333 gfc_current_ns
= parent_ns
;
3338 /* These statements are associated with the end of the host unit. */
3339 case ST_END_FUNCTION
:
3341 case ST_END_PROGRAM
:
3342 case ST_END_SUBROUTINE
:
3343 accept_statement (st
);
3347 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
3348 gfc_ascii_statement (st
));
3349 reject_statement ();
3355 while (st
!= ST_END_FUNCTION
&& st
!= ST_END_SUBROUTINE
3356 && st
!= ST_END_MODULE
&& st
!= ST_END_PROGRAM
);
3358 /* The first namespace in the list is guaranteed to not have
3359 anything (worthwhile) in it. */
3360 tmp
= gfc_current_ns
;
3361 gfc_current_ns
= parent_ns
;
3362 if (seen_error
&& tmp
->refs
> 1)
3363 gfc_free_namespace (tmp
);
3365 ns
= gfc_current_ns
->contained
;
3366 gfc_current_ns
->contained
= ns
->sibling
;
3367 gfc_free_namespace (ns
);
3370 if (!contains_statements
)
3371 gfc_notify_std (GFC_STD_F2008
, "Fortran 2008: CONTAINS statement without "
3372 "FUNCTION or SUBROUTINE statement at %C");
3376 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
3379 parse_progunit (gfc_statement st
)
3384 st
= parse_spec (st
);
3394 accept_statement (st
);
3401 if (gfc_current_state () == COMP_FUNCTION
)
3402 gfc_check_function_type (gfc_current_ns
);
3407 st
= parse_executable (st
);
3418 accept_statement (st
);
3425 unexpected_statement (st
);
3426 reject_statement ();
3427 st
= next_statement ();
3433 for (p
= gfc_state_stack
; p
; p
= p
->previous
)
3434 if (p
->state
== COMP_CONTAINS
)
3437 if (gfc_find_state (COMP_MODULE
) == SUCCESS
)
3442 gfc_error ("CONTAINS statement at %C is already in a contained "
3444 st
= next_statement ();
3448 parse_contained (0);
3451 gfc_current_ns
->code
= gfc_state_stack
->head
;
3455 /* Come here to complain about a global symbol already in use as
3459 gfc_global_used (gfc_gsymbol
*sym
, locus
*where
)
3464 where
= &gfc_current_locus
;
3474 case GSYM_SUBROUTINE
:
3475 name
= "SUBROUTINE";
3480 case GSYM_BLOCK_DATA
:
3481 name
= "BLOCK DATA";
3487 gfc_internal_error ("gfc_global_used(): Bad type");
3491 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3492 sym
->name
, where
, name
, &sym
->where
);
3496 /* Parse a block data program unit. */
3499 parse_block_data (void)
3502 static locus blank_locus
;
3503 static int blank_block
=0;
3506 gfc_current_ns
->proc_name
= gfc_new_block
;
3507 gfc_current_ns
->is_block_data
= 1;
3509 if (gfc_new_block
== NULL
)
3512 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3513 "prior BLOCK DATA at %L", &blank_locus
);
3517 blank_locus
= gfc_current_locus
;
3522 s
= gfc_get_gsymbol (gfc_new_block
->name
);
3524 || (s
->type
!= GSYM_UNKNOWN
&& s
->type
!= GSYM_BLOCK_DATA
))
3525 gfc_global_used(s
, NULL
);
3528 s
->type
= GSYM_BLOCK_DATA
;
3529 s
->where
= gfc_current_locus
;
3534 st
= parse_spec (ST_NONE
);
3536 while (st
!= ST_END_BLOCK_DATA
)
3538 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3539 gfc_ascii_statement (st
));
3540 reject_statement ();
3541 st
= next_statement ();
3546 /* Parse a module subprogram. */
3554 s
= gfc_get_gsymbol (gfc_new_block
->name
);
3555 if (s
->defined
|| (s
->type
!= GSYM_UNKNOWN
&& s
->type
!= GSYM_MODULE
))
3556 gfc_global_used(s
, NULL
);
3559 s
->type
= GSYM_MODULE
;
3560 s
->where
= gfc_current_locus
;
3564 st
= parse_spec (ST_NONE
);
3573 parse_contained (1);
3577 accept_statement (st
);
3581 gfc_error ("Unexpected %s statement in MODULE at %C",
3582 gfc_ascii_statement (st
));
3584 reject_statement ();
3585 st
= next_statement ();
3591 /* Add a procedure name to the global symbol table. */
3594 add_global_procedure (int sub
)
3598 s
= gfc_get_gsymbol(gfc_new_block
->name
);
3601 || (s
->type
!= GSYM_UNKNOWN
3602 && s
->type
!= (sub
? GSYM_SUBROUTINE
: GSYM_FUNCTION
)))
3603 gfc_global_used(s
, NULL
);
3606 s
->type
= sub
? GSYM_SUBROUTINE
: GSYM_FUNCTION
;
3607 s
->where
= gfc_current_locus
;
3613 /* Add a program to the global symbol table. */
3616 add_global_program (void)
3620 if (gfc_new_block
== NULL
)
3622 s
= gfc_get_gsymbol (gfc_new_block
->name
);
3624 if (s
->defined
|| (s
->type
!= GSYM_UNKNOWN
&& s
->type
!= GSYM_PROGRAM
))
3625 gfc_global_used(s
, NULL
);
3628 s
->type
= GSYM_PROGRAM
;
3629 s
->where
= gfc_current_locus
;
3635 /* Top level parser. */
3638 gfc_parse_file (void)
3640 int seen_program
, errors_before
, errors
;
3641 gfc_state_data top
, s
;
3645 gfc_start_source_files ();
3647 top
.state
= COMP_NONE
;
3649 top
.previous
= NULL
;
3650 top
.head
= top
.tail
= NULL
;
3651 top
.do_variable
= NULL
;
3653 gfc_state_stack
= &top
;
3655 gfc_clear_new_st ();
3657 gfc_statement_label
= NULL
;
3659 if (setjmp (eof_buf
))
3660 return FAILURE
; /* Come here on unexpected EOF */
3664 /* Exit early for empty files. */
3670 st
= next_statement ();
3679 goto duplicate_main
;
3681 prog_locus
= gfc_current_locus
;
3683 push_state (&s
, COMP_PROGRAM
, gfc_new_block
);
3684 main_program_symbol(gfc_current_ns
, gfc_new_block
->name
);
3685 accept_statement (st
);
3686 add_global_program ();
3687 parse_progunit (ST_NONE
);
3691 add_global_procedure (1);
3692 push_state (&s
, COMP_SUBROUTINE
, gfc_new_block
);
3693 accept_statement (st
);
3694 parse_progunit (ST_NONE
);
3698 add_global_procedure (0);
3699 push_state (&s
, COMP_FUNCTION
, gfc_new_block
);
3700 accept_statement (st
);
3701 parse_progunit (ST_NONE
);
3705 push_state (&s
, COMP_BLOCK_DATA
, gfc_new_block
);
3706 accept_statement (st
);
3707 parse_block_data ();
3711 push_state (&s
, COMP_MODULE
, gfc_new_block
);
3712 accept_statement (st
);
3714 gfc_get_errors (NULL
, &errors_before
);
3718 /* Anything else starts a nameless main program block. */
3721 goto duplicate_main
;
3723 prog_locus
= gfc_current_locus
;
3725 push_state (&s
, COMP_PROGRAM
, gfc_new_block
);
3726 main_program_symbol (gfc_current_ns
, "MAIN__");
3727 parse_progunit (st
);
3731 gfc_current_ns
->code
= s
.head
;
3733 gfc_resolve (gfc_current_ns
);
3735 /* Dump the parse tree if requested. */
3736 if (gfc_option
.dump_parse_tree
)
3737 gfc_dump_parse_tree (gfc_current_ns
, stdout
);
3739 gfc_get_errors (NULL
, &errors
);
3740 if (s
.state
== COMP_MODULE
)
3742 gfc_dump_module (s
.sym
->name
, errors_before
== errors
);
3744 gfc_generate_module_code (gfc_current_ns
);
3749 gfc_generate_code (gfc_current_ns
);
3757 gfc_end_source_files ();
3761 /* If we see a duplicate main program, shut down. If the second
3762 instance is an implied main program, i.e. data decls or executable
3763 statements, we're in for lots of errors. */
3764 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus
);
3765 reject_statement ();