2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
31 /* Current statement label. Zero means no statement label. Because
32 new_st can get wiped during statement matching, we have to keep it
35 gfc_st_label *gfc_statement_label;
37 static locus label_locus;
38 static jmp_buf eof_buf;
40 gfc_state_data *gfc_state_stack;
42 /* TODO: Re-order functions to kill these forward decls. */
43 static void check_statement_label (gfc_statement);
44 static void undo_new_statement (void);
45 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 decode_statement (void)
101 gfc_clear_error (); /* Clear any pending errors. */
102 gfc_clear_warning (); /* Clear any pending warnings. */
104 if (gfc_match_eos () == MATCH_YES)
107 old_locus = gfc_current_locus;
109 /* Try matching a data declaration or function declaration. The
110 input "REALFUNCTIONA(N)" can mean several things in different
111 contexts, so it (and its relatives) get special treatment. */
113 if (gfc_current_state () == COMP_NONE
114 || gfc_current_state () == COMP_INTERFACE
115 || gfc_current_state () == COMP_CONTAINS)
117 m = gfc_match_function_decl ();
120 else if (m == MATCH_ERROR)
124 gfc_current_locus = old_locus;
127 /* Match statements whose error messages are meant to be overwritten
128 by something better. */
130 match (NULL, gfc_match_assignment, ST_ASSIGNMENT);
131 match (NULL, gfc_match_pointer_assignment, ST_POINTER_ASSIGNMENT);
132 match (NULL, gfc_match_st_function, ST_STATEMENT_FUNCTION);
134 match (NULL, gfc_match_data_decl, ST_DATA_DECL);
135 match (NULL, gfc_match_enumerator_def, ST_ENUMERATOR);
137 /* Try to match a subroutine statement, which has the same optional
138 prefixes that functions can have. */
140 if (gfc_match_subroutine () == MATCH_YES)
141 return ST_SUBROUTINE;
143 gfc_current_locus = old_locus;
145 /* Check for the IF, DO, SELECT, WHERE and FORALL statements, which
146 might begin with a block label. The match functions for these
147 statements are unusual in that their keyword is not seen before
148 the matcher is called. */
150 if (gfc_match_if (&st) == MATCH_YES)
153 gfc_current_locus = old_locus;
155 if (gfc_match_where (&st) == MATCH_YES)
158 gfc_current_locus = old_locus;
160 if (gfc_match_forall (&st) == MATCH_YES)
163 gfc_current_locus = old_locus;
165 match (NULL, gfc_match_do, ST_DO);
166 match (NULL, gfc_match_select, ST_SELECT_CASE);
168 /* General statement matching: Instead of testing every possible
169 statement, we eliminate most possibilities by peeking at the
172 c = gfc_peek_char ();
177 match ("allocate", gfc_match_allocate, ST_ALLOCATE);
178 match ("allocatable", gfc_match_allocatable, ST_ATTR_DECL);
179 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT);
183 match ("backspace", gfc_match_backspace, ST_BACKSPACE);
184 match ("block data", gfc_match_block_data, ST_BLOCK_DATA);
188 match ("call", gfc_match_call, ST_CALL);
189 match ("close", gfc_match_close, ST_CLOSE);
190 match ("continue", gfc_match_continue, ST_CONTINUE);
191 match ("cycle", gfc_match_cycle, ST_CYCLE);
192 match ("case", gfc_match_case, ST_CASE);
193 match ("common", gfc_match_common, ST_COMMON);
194 match ("contains", gfc_match_eos, ST_CONTAINS);
198 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE);
199 match ("data", gfc_match_data, ST_DATA);
200 match ("dimension", gfc_match_dimension, ST_ATTR_DECL);
204 match ("end file", gfc_match_endfile, ST_END_FILE);
205 match ("exit", gfc_match_exit, ST_EXIT);
206 match ("else", gfc_match_else, ST_ELSE);
207 match ("else where", gfc_match_elsewhere, ST_ELSEWHERE);
208 match ("else if", gfc_match_elseif, ST_ELSEIF);
209 match ("enum , bind ( c )", gfc_match_enum, ST_ENUM);
211 if (gfc_match_end (&st) == MATCH_YES)
214 match ("entry% ", gfc_match_entry, ST_ENTRY);
215 match ("equivalence", gfc_match_equivalence, ST_EQUIVALENCE);
216 match ("external", gfc_match_external, ST_ATTR_DECL);
220 match ("flush", gfc_match_flush, ST_FLUSH);
221 match ("format", gfc_match_format, ST_FORMAT);
225 match ("go to", gfc_match_goto, ST_GOTO);
229 match ("inquire", gfc_match_inquire, ST_INQUIRE);
230 match ("implicit", gfc_match_implicit, ST_IMPLICIT);
231 match ("implicit% none", gfc_match_implicit_none, ST_IMPLICIT_NONE);
232 match ("import", gfc_match_import, ST_IMPORT);
233 match ("interface", gfc_match_interface, ST_INTERFACE);
234 match ("intent", gfc_match_intent, ST_ATTR_DECL);
235 match ("intrinsic", gfc_match_intrinsic, ST_ATTR_DECL);
239 match ("module% procedure% ", gfc_match_modproc, ST_MODULE_PROC);
240 match ("module", gfc_match_module, ST_MODULE);
244 match ("nullify", gfc_match_nullify, ST_NULLIFY);
245 match ("namelist", gfc_match_namelist, ST_NAMELIST);
249 match ("open", gfc_match_open, ST_OPEN);
250 match ("optional", gfc_match_optional, ST_ATTR_DECL);
254 match ("print", gfc_match_print, ST_WRITE);
255 match ("parameter", gfc_match_parameter, ST_PARAMETER);
256 match ("pause", gfc_match_pause, ST_PAUSE);
257 match ("pointer", gfc_match_pointer, ST_ATTR_DECL);
258 if (gfc_match_private (&st) == MATCH_YES)
260 match ("program", gfc_match_program, ST_PROGRAM);
261 if (gfc_match_public (&st) == MATCH_YES)
266 match ("read", gfc_match_read, ST_READ);
267 match ("return", gfc_match_return, ST_RETURN);
268 match ("rewind", gfc_match_rewind, ST_REWIND);
272 match ("sequence", gfc_match_eos, ST_SEQUENCE);
273 match ("stop", gfc_match_stop, ST_STOP);
274 match ("save", gfc_match_save, ST_ATTR_DECL);
278 match ("target", gfc_match_target, ST_ATTR_DECL);
279 match ("type", gfc_match_derived_decl, ST_DERIVED_DECL);
283 match ("use", gfc_match_use, ST_USE);
287 match ("volatile", gfc_match_volatile, ST_ATTR_DECL);
291 match ("write", gfc_match_write, ST_WRITE);
295 /* All else has failed, so give up. See if any of the matchers has
296 stored an error message of some sort. */
298 if (gfc_error_check () == 0)
299 gfc_error_now ("Unclassifiable statement at %C");
303 gfc_error_recovery ();
309 decode_omp_directive (void)
318 gfc_clear_error (); /* Clear any pending errors. */
319 gfc_clear_warning (); /* Clear any pending warnings. */
323 gfc_error_now ("OpenMP directives at %C may not appear in PURE or ELEMENTAL procedures");
324 gfc_error_recovery ();
328 old_locus = gfc_current_locus;
330 /* General OpenMP directive matching: Instead of testing every possible
331 statement, we eliminate most possibilities by peeking at the
334 c = gfc_peek_char ();
339 match ("atomic", gfc_match_omp_atomic, ST_OMP_ATOMIC);
342 match ("barrier", gfc_match_omp_barrier, ST_OMP_BARRIER);
345 match ("critical", gfc_match_omp_critical, ST_OMP_CRITICAL);
348 match ("do", gfc_match_omp_do, ST_OMP_DO);
351 match ("end critical", gfc_match_omp_critical, ST_OMP_END_CRITICAL);
352 match ("end do", gfc_match_omp_end_nowait, ST_OMP_END_DO);
353 match ("end master", gfc_match_omp_eos, ST_OMP_END_MASTER);
354 match ("end ordered", gfc_match_omp_eos, ST_OMP_END_ORDERED);
355 match ("end parallel do", gfc_match_omp_eos, ST_OMP_END_PARALLEL_DO);
356 match ("end parallel sections", gfc_match_omp_eos,
357 ST_OMP_END_PARALLEL_SECTIONS);
358 match ("end parallel workshare", gfc_match_omp_eos,
359 ST_OMP_END_PARALLEL_WORKSHARE);
360 match ("end parallel", gfc_match_omp_eos, ST_OMP_END_PARALLEL);
361 match ("end sections", gfc_match_omp_end_nowait, ST_OMP_END_SECTIONS);
362 match ("end single", gfc_match_omp_end_single, ST_OMP_END_SINGLE);
363 match ("end workshare", gfc_match_omp_end_nowait,
364 ST_OMP_END_WORKSHARE);
367 match ("flush", gfc_match_omp_flush, ST_OMP_FLUSH);
370 match ("master", gfc_match_omp_master, ST_OMP_MASTER);
373 match ("ordered", gfc_match_omp_ordered, ST_OMP_ORDERED);
376 match ("parallel do", gfc_match_omp_parallel_do, ST_OMP_PARALLEL_DO);
377 match ("parallel sections", gfc_match_omp_parallel_sections,
378 ST_OMP_PARALLEL_SECTIONS);
379 match ("parallel workshare", gfc_match_omp_parallel_workshare,
380 ST_OMP_PARALLEL_WORKSHARE);
381 match ("parallel", gfc_match_omp_parallel, ST_OMP_PARALLEL);
384 match ("sections", gfc_match_omp_sections, ST_OMP_SECTIONS);
385 match ("section", gfc_match_omp_eos, ST_OMP_SECTION);
386 match ("single", gfc_match_omp_single, ST_OMP_SINGLE);
389 match ("threadprivate", gfc_match_omp_threadprivate,
390 ST_OMP_THREADPRIVATE);
392 match ("workshare", gfc_match_omp_workshare, ST_OMP_WORKSHARE);
396 /* All else has failed, so give up. See if any of the matchers has
397 stored an error message of some sort. */
399 if (gfc_error_check () == 0)
400 gfc_error_now ("Unclassifiable OpenMP directive at %C");
404 gfc_error_recovery ();
412 /* Get the next statement in free form source. */
418 int c, d, cnt, at_bol;
420 at_bol = gfc_at_bol ();
421 gfc_gobble_whitespace ();
423 c = gfc_peek_char ();
427 /* Found a statement label? */
428 m = gfc_match_st_label (&gfc_statement_label);
430 d = gfc_peek_char ();
431 if (m != MATCH_YES || !gfc_is_whitespace (d))
433 gfc_match_small_literal_int (&c, &cnt);
436 gfc_error_now ("Too many digits in statement label at %C");
439 gfc_error_now ("Zero is not a valid statement label at %C");
442 c = gfc_next_char ();
445 if (!gfc_is_whitespace (c))
446 gfc_error_now ("Non-numeric character in statement label at %C");
452 label_locus = gfc_current_locus;
454 gfc_gobble_whitespace ();
456 if (at_bol && gfc_peek_char () == ';')
459 ("Semicolon at %C needs to be preceded by statement");
460 gfc_next_char (); /* Eat up the semicolon. */
464 if (gfc_match_eos () == MATCH_YES)
467 ("Ignoring statement label in empty statement at %C");
468 gfc_free_st_label (gfc_statement_label);
469 gfc_statement_label = NULL;
476 /* Comments have already been skipped by the time we get here,
477 except for OpenMP directives. */
478 if (gfc_option.flag_openmp)
482 c = gfc_next_char ();
483 for (i = 0; i < 5; i++, c = gfc_next_char ())
484 gcc_assert (c == "!$omp"[i]);
486 gcc_assert (c == ' ');
487 return decode_omp_directive ();
491 if (at_bol && c == ';')
493 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
494 gfc_next_char (); /* Eat up the semicolon. */
498 return decode_statement ();
502 /* Get the next statement in fixed-form source. */
507 int label, digit_flag, i;
512 return decode_statement ();
514 /* Skip past the current label field, parsing a statement label if
515 one is there. This is a weird number parser, since the number is
516 contained within five columns and can have any kind of embedded
517 spaces. We also check for characters that make the rest of the
523 for (i = 0; i < 5; i++)
525 c = gfc_next_char_literal (0);
542 label = label * 10 + c - '0';
543 label_locus = gfc_current_locus;
547 /* Comments have already been skipped by the time we get
548 here, except for OpenMP directives. */
550 if (gfc_option.flag_openmp)
552 for (i = 0; i < 5; i++, c = gfc_next_char_literal (0))
553 gcc_assert (TOLOWER (c) == "*$omp"[i]);
555 if (c != ' ' && c != '0')
557 gfc_buffer_error (0);
558 gfc_error ("Bad continuation line at %C");
562 return decode_omp_directive ();
566 /* Comments have already been skipped by the time we get
567 here so don't bother checking for them. */
570 gfc_buffer_error (0);
571 gfc_error ("Non-numeric character in statement label at %C");
579 gfc_warning_now ("Zero is not a valid statement label at %C");
582 /* We've found a valid statement label. */
583 gfc_statement_label = gfc_get_st_label (label);
587 /* Since this line starts a statement, it cannot be a continuation
588 of a previous statement. If we see something here besides a
589 space or zero, it must be a bad continuation line. */
591 c = gfc_next_char_literal (0);
595 if (c != ' ' && c != '0')
597 gfc_buffer_error (0);
598 gfc_error ("Bad continuation line at %C");
602 /* Now that we've taken care of the statement label columns, we have
603 to make sure that the first nonblank character is not a '!'. If
604 it is, the rest of the line is a comment. */
608 loc = gfc_current_locus;
609 c = gfc_next_char_literal (0);
611 while (gfc_is_whitespace (c));
615 gfc_current_locus = loc;
619 gfc_error_now ("Semicolon at %C needs to be preceded by statement");
623 if (gfc_match_eos () == MATCH_YES)
626 /* At this point, we've got a nonblank statement to parse. */
627 return decode_statement ();
631 gfc_warning ("Ignoring statement label in empty statement at %C");
637 /* Return the next non-ST_NONE statement to the caller. We also worry
638 about including files and the ends of include files at this stage. */
641 next_statement (void)
645 gfc_new_block = NULL;
649 gfc_statement_label = NULL;
650 gfc_buffer_error (1);
654 if (gfc_option.warn_line_truncation
655 && gfc_current_locus.lb
656 && gfc_current_locus.lb->truncated)
657 gfc_warning_now ("Line truncated at %C");
662 gfc_skip_comments ();
671 (gfc_current_form == FORM_FIXED) ? next_fixed () : next_free ();
677 gfc_buffer_error (0);
680 check_statement_label (st);
686 /****************************** Parser ***********************************/
688 /* The parser subroutines are of type 'try' that fail if the file ends
691 /* Macros that expand to case-labels for various classes of
692 statements. Start with executable statements that directly do
695 #define case_executable case ST_ALLOCATE: case ST_BACKSPACE: case ST_CALL: \
696 case ST_CLOSE: case ST_CONTINUE: case ST_DEALLOCATE: case ST_END_FILE: \
697 case ST_GOTO: case ST_INQUIRE: case ST_NULLIFY: case ST_OPEN: \
698 case ST_READ: case ST_RETURN: case ST_REWIND: case ST_SIMPLE_IF: \
699 case ST_PAUSE: case ST_STOP: case ST_WRITE: case ST_ASSIGNMENT: \
700 case ST_POINTER_ASSIGNMENT: case ST_EXIT: case ST_CYCLE: \
701 case ST_ARITHMETIC_IF: case ST_WHERE: case ST_FORALL: \
702 case ST_LABEL_ASSIGNMENT: case ST_FLUSH: case ST_OMP_FLUSH: \
705 /* Statements that mark other executable statements. */
707 #define case_exec_markers case ST_DO: case ST_FORALL_BLOCK: case ST_IF_BLOCK: \
708 case ST_WHERE_BLOCK: case ST_SELECT_CASE: case ST_OMP_PARALLEL: \
709 case ST_OMP_PARALLEL_SECTIONS: case ST_OMP_SECTIONS: case ST_OMP_ORDERED: \
710 case ST_OMP_CRITICAL: case ST_OMP_MASTER: case ST_OMP_SINGLE: \
711 case ST_OMP_DO: case ST_OMP_PARALLEL_DO: case ST_OMP_ATOMIC: \
712 case ST_OMP_WORKSHARE: case ST_OMP_PARALLEL_WORKSHARE
714 /* Declaration statements */
716 #define case_decl case ST_ATTR_DECL: case ST_COMMON: case ST_DATA_DECL: \
717 case ST_EQUIVALENCE: case ST_NAMELIST: case ST_STATEMENT_FUNCTION: \
718 case ST_TYPE: case ST_INTERFACE: case ST_OMP_THREADPRIVATE
720 /* Block end statements. Errors associated with interchanging these
721 are detected in gfc_match_end(). */
723 #define case_end case ST_END_BLOCK_DATA: case ST_END_FUNCTION: \
724 case ST_END_PROGRAM: case ST_END_SUBROUTINE
727 /* Push a new state onto the stack. */
730 push_state (gfc_state_data * p, gfc_compile_state new_state, gfc_symbol * sym)
733 p->state = new_state;
734 p->previous = gfc_state_stack;
736 p->head = p->tail = NULL;
737 p->do_variable = NULL;
743 /* Pop the current state. */
749 gfc_state_stack = gfc_state_stack->previous;
753 /* Try to find the given state in the state stack. */
756 gfc_find_state (gfc_compile_state state)
760 for (p = gfc_state_stack; p; p = p->previous)
761 if (p->state == state)
764 return (p == NULL) ? FAILURE : SUCCESS;
768 /* Starts a new level in the statement list. */
771 new_level (gfc_code * q)
775 p = q->block = gfc_get_code ();
777 gfc_state_stack->head = gfc_state_stack->tail = p;
783 /* Add the current new_st code structure and adds it to the current
784 program unit. As a side-effect, it zeroes the new_st. */
794 p->loc = gfc_current_locus;
796 if (gfc_state_stack->head == NULL)
797 gfc_state_stack->head = p;
799 gfc_state_stack->tail->next = p;
801 while (p->next != NULL)
804 gfc_state_stack->tail = p;
812 /* Frees everything associated with the current statement. */
815 undo_new_statement (void)
817 gfc_free_statements (new_st.block);
818 gfc_free_statements (new_st.next);
819 gfc_free_statement (&new_st);
824 /* If the current statement has a statement label, make sure that it
825 is allowed to, or should have one. */
828 check_statement_label (gfc_statement st)
832 if (gfc_statement_label == NULL)
835 gfc_error ("FORMAT statement at %L does not have a statement label",
843 case ST_END_FUNCTION:
844 case ST_END_SUBROUTINE:
850 type = ST_LABEL_TARGET;
854 type = ST_LABEL_FORMAT;
857 /* Statement labels are not restricted from appearing on a
858 particular line. However, there are plenty of situations
859 where the resulting label can't be referenced. */
862 type = ST_LABEL_BAD_TARGET;
866 gfc_define_st_label (gfc_statement_label, type, &label_locus);
868 new_st.here = gfc_statement_label;
872 /* Figures out what the enclosing program unit is. This will be a
873 function, subroutine, program, block data or module. */
876 gfc_enclosing_unit (gfc_compile_state * result)
880 for (p = gfc_state_stack; p; p = p->previous)
881 if (p->state == COMP_FUNCTION || p->state == COMP_SUBROUTINE
882 || p->state == COMP_MODULE || p->state == COMP_BLOCK_DATA
883 || p->state == COMP_PROGRAM)
892 *result = COMP_PROGRAM;
897 /* Translate a statement enum to a string. */
900 gfc_ascii_statement (gfc_statement st)
906 case ST_ARITHMETIC_IF:
907 p = _("arithmetic IF");
913 p = _("attribute declaration");
943 p = _("data declaration");
951 case ST_DERIVED_DECL:
952 p = _("derived type declaration");
966 case ST_END_BLOCK_DATA:
967 p = "END BLOCK DATA";
978 case ST_END_FUNCTION:
984 case ST_END_INTERFACE:
996 case ST_END_SUBROUTINE:
997 p = "END SUBROUTINE";
1008 case ST_EQUIVALENCE:
1017 case ST_FORALL_BLOCK: /* Fall through */
1036 case ST_IMPLICIT_NONE:
1037 p = "IMPLICIT NONE";
1039 case ST_IMPLIED_ENDDO:
1040 p = _("implied END DO");
1066 case ST_MODULE_PROC:
1067 p = "MODULE PROCEDURE";
1102 case ST_WHERE_BLOCK: /* Fall through */
1110 p = _("assignment");
1112 case ST_POINTER_ASSIGNMENT:
1113 p = _("pointer assignment");
1115 case ST_SELECT_CASE:
1124 case ST_STATEMENT_FUNCTION:
1125 p = "STATEMENT FUNCTION";
1127 case ST_LABEL_ASSIGNMENT:
1128 p = "LABEL ASSIGNMENT";
1131 p = "ENUM DEFINITION";
1134 p = "ENUMERATOR DEFINITION";
1142 case ST_OMP_BARRIER:
1143 p = "!$OMP BARRIER";
1145 case ST_OMP_CRITICAL:
1146 p = "!$OMP CRITICAL";
1151 case ST_OMP_END_CRITICAL:
1152 p = "!$OMP END CRITICAL";
1157 case ST_OMP_END_MASTER:
1158 p = "!$OMP END MASTER";
1160 case ST_OMP_END_ORDERED:
1161 p = "!$OMP END ORDERED";
1163 case ST_OMP_END_PARALLEL:
1164 p = "!$OMP END PARALLEL";
1166 case ST_OMP_END_PARALLEL_DO:
1167 p = "!$OMP END PARALLEL DO";
1169 case ST_OMP_END_PARALLEL_SECTIONS:
1170 p = "!$OMP END PARALLEL SECTIONS";
1172 case ST_OMP_END_PARALLEL_WORKSHARE:
1173 p = "!$OMP END PARALLEL WORKSHARE";
1175 case ST_OMP_END_SECTIONS:
1176 p = "!$OMP END SECTIONS";
1178 case ST_OMP_END_SINGLE:
1179 p = "!$OMP END SINGLE";
1181 case ST_OMP_END_WORKSHARE:
1182 p = "!$OMP END WORKSHARE";
1190 case ST_OMP_ORDERED:
1191 p = "!$OMP ORDERED";
1193 case ST_OMP_PARALLEL:
1194 p = "!$OMP PARALLEL";
1196 case ST_OMP_PARALLEL_DO:
1197 p = "!$OMP PARALLEL DO";
1199 case ST_OMP_PARALLEL_SECTIONS:
1200 p = "!$OMP PARALLEL SECTIONS";
1202 case ST_OMP_PARALLEL_WORKSHARE:
1203 p = "!$OMP PARALLEL WORKSHARE";
1205 case ST_OMP_SECTIONS:
1206 p = "!$OMP SECTIONS";
1208 case ST_OMP_SECTION:
1209 p = "!$OMP SECTION";
1214 case ST_OMP_THREADPRIVATE:
1215 p = "!$OMP THREADPRIVATE";
1217 case ST_OMP_WORKSHARE:
1218 p = "!$OMP WORKSHARE";
1221 gfc_internal_error ("gfc_ascii_statement(): Bad statement code");
1228 /* Create a symbol for the main program and assign it to ns->proc_name. */
1231 main_program_symbol (gfc_namespace * ns)
1233 gfc_symbol *main_program;
1234 symbol_attribute attr;
1236 gfc_get_symbol ("MAIN__", ns, &main_program);
1237 gfc_clear_attr (&attr);
1238 attr.flavor = FL_PROCEDURE;
1239 attr.proc = PROC_UNKNOWN;
1240 attr.subroutine = 1;
1241 attr.access = ACCESS_PUBLIC;
1242 attr.is_main_program = 1;
1243 main_program->attr = attr;
1244 main_program->declared_at = gfc_current_locus;
1245 ns->proc_name = main_program;
1246 gfc_commit_symbols ();
1250 /* Do whatever is necessary to accept the last statement. */
1253 accept_statement (gfc_statement st)
1262 case ST_IMPLICIT_NONE:
1263 gfc_set_implicit_none ();
1272 gfc_current_ns->proc_name = gfc_new_block;
1275 /* If the statement is the end of a block, lay down a special code
1276 that allows a branch to the end of the block from within the
1281 if (gfc_statement_label != NULL)
1283 new_st.op = EXEC_NOP;
1289 /* The end-of-program unit statements do not get the special
1290 marker and require a statement of some sort if they are a
1293 case ST_END_PROGRAM:
1294 case ST_END_FUNCTION:
1295 case ST_END_SUBROUTINE:
1296 if (gfc_statement_label != NULL)
1298 new_st.op = EXEC_RETURN;
1314 gfc_commit_symbols ();
1315 gfc_warning_check ();
1316 gfc_clear_new_st ();
1320 /* Undo anything tentative that has been built for the current
1324 reject_statement (void)
1326 gfc_new_block = NULL;
1327 gfc_undo_symbols ();
1328 gfc_clear_warning ();
1329 undo_new_statement ();
1333 /* Generic complaint about an out of order statement. We also do
1334 whatever is necessary to clean up. */
1337 unexpected_statement (gfc_statement st)
1340 gfc_error ("Unexpected %s statement at %C", gfc_ascii_statement (st));
1342 reject_statement ();
1346 /* Given the next statement seen by the matcher, make sure that it is
1347 in proper order with the last. This subroutine is initialized by
1348 calling it with an argument of ST_NONE. If there is a problem, we
1349 issue an error and return FAILURE. Otherwise we return SUCCESS.
1351 Individual parsers need to verify that the statements seen are
1352 valid before calling here, ie ENTRY statements are not allowed in
1353 INTERFACE blocks. The following diagram is taken from the standard:
1355 +---------------------------------------+
1356 | program subroutine function module |
1357 +---------------------------------------+
1359 +---------------------------------------+
1361 +---------------------------------------+
1363 | +-----------+------------------+
1364 | | parameter | implicit |
1365 | +-----------+------------------+
1366 | format | | derived type |
1367 | entry | parameter | interface |
1368 | | data | specification |
1369 | | | statement func |
1370 | +-----------+------------------+
1371 | | data | executable |
1372 +--------+-----------+------------------+
1374 +---------------------------------------+
1375 | internal module/subprogram |
1376 +---------------------------------------+
1378 +---------------------------------------+
1385 { ORDER_START, ORDER_USE, ORDER_IMPORT, ORDER_IMPLICIT_NONE,
1386 ORDER_IMPLICIT, ORDER_SPEC, ORDER_EXEC
1389 gfc_statement last_statement;
1395 verify_st_order (st_state * p, gfc_statement st)
1401 p->state = ORDER_START;
1405 if (p->state > ORDER_USE)
1407 p->state = ORDER_USE;
1411 if (p->state > ORDER_IMPORT)
1413 p->state = ORDER_IMPORT;
1416 case ST_IMPLICIT_NONE:
1417 if (p->state > ORDER_IMPLICIT_NONE)
1420 /* The '>' sign cannot be a '>=', because a FORMAT or ENTRY
1421 statement disqualifies a USE but not an IMPLICIT NONE.
1422 Duplicate IMPLICIT NONEs are caught when the implicit types
1425 p->state = ORDER_IMPLICIT_NONE;
1429 if (p->state > ORDER_IMPLICIT)
1431 p->state = ORDER_IMPLICIT;
1436 if (p->state < ORDER_IMPLICIT_NONE)
1437 p->state = ORDER_IMPLICIT_NONE;
1441 if (p->state >= ORDER_EXEC)
1443 if (p->state < ORDER_IMPLICIT)
1444 p->state = ORDER_IMPLICIT;
1448 if (p->state < ORDER_SPEC)
1449 p->state = ORDER_SPEC;
1454 case ST_DERIVED_DECL:
1456 if (p->state >= ORDER_EXEC)
1458 if (p->state < ORDER_SPEC)
1459 p->state = ORDER_SPEC;
1464 if (p->state < ORDER_EXEC)
1465 p->state = ORDER_EXEC;
1470 ("Unexpected %s statement in verify_st_order() at %C",
1471 gfc_ascii_statement (st));
1474 /* All is well, record the statement in case we need it next time. */
1475 p->where = gfc_current_locus;
1476 p->last_statement = st;
1480 gfc_error ("%s statement at %C cannot follow %s statement at %L",
1481 gfc_ascii_statement (st),
1482 gfc_ascii_statement (p->last_statement), &p->where);
1488 /* Handle an unexpected end of file. This is a show-stopper... */
1490 static void unexpected_eof (void) ATTRIBUTE_NORETURN;
1493 unexpected_eof (void)
1497 gfc_error ("Unexpected end of file in '%s'", gfc_source_file);
1499 /* Memory cleanup. Move to "second to last". */
1500 for (p = gfc_state_stack; p && p->previous && p->previous->previous;
1503 gfc_current_ns->code = (p && p->previous) ? p->head : NULL;
1506 longjmp (eof_buf, 1);
1510 /* Parse a derived type. */
1513 parse_derived (void)
1515 int compiling_type, seen_private, seen_sequence, seen_component, error_flag;
1523 accept_statement (ST_DERIVED_DECL);
1524 push_state (&s, COMP_DERIVED, gfc_new_block);
1526 gfc_new_block->component_access = ACCESS_PUBLIC;
1533 while (compiling_type)
1535 st = next_statement ();
1542 accept_statement (st);
1549 if (!seen_component)
1551 gfc_error ("Derived type definition at %C has no components");
1555 accept_statement (ST_END_TYPE);
1559 if (gfc_find_state (COMP_MODULE) == FAILURE)
1562 ("PRIVATE statement in TYPE at %C must be inside a MODULE");
1569 gfc_error ("PRIVATE statement at %C must precede "
1570 "structure components");
1577 gfc_error ("Duplicate PRIVATE statement at %C");
1581 s.sym->component_access = ACCESS_PRIVATE;
1582 accept_statement (ST_PRIVATE);
1589 gfc_error ("SEQUENCE statement at %C must precede "
1590 "structure components");
1595 if (gfc_current_block ()->attr.sequence)
1596 gfc_warning ("SEQUENCE attribute at %C already specified in "
1601 gfc_error ("Duplicate SEQUENCE statement at %C");
1606 gfc_add_sequence (&gfc_current_block ()->attr,
1607 gfc_current_block ()->name, NULL);
1611 unexpected_statement (st);
1616 /* Look for allocatable components. */
1617 sym = gfc_current_block ();
1618 for (c = sym->components; c; c = c->next)
1620 if (c->allocatable || (c->ts.type == BT_DERIVED
1621 && c->ts.derived->attr.alloc_comp))
1623 sym->attr.alloc_comp = 1;
1633 /* Parse an ENUM. */
1642 int seen_enumerator = 0;
1646 push_state (&s, COMP_ENUM, gfc_new_block);
1650 while (compiling_enum)
1652 st = next_statement ();
1660 seen_enumerator = 1;
1661 accept_statement (st);
1666 if (!seen_enumerator)
1668 gfc_error ("ENUM declaration at %C has no ENUMERATORS");
1671 accept_statement (st);
1675 gfc_free_enum_history ();
1676 unexpected_statement (st);
1683 /* Parse an interface. We must be able to deal with the possibility
1684 of recursive interfaces. The parse_spec() subroutine is mutually
1685 recursive with parse_interface(). */
1687 static gfc_statement parse_spec (gfc_statement);
1690 parse_interface (void)
1692 gfc_compile_state new_state, current_state;
1693 gfc_symbol *prog_unit, *sym;
1694 gfc_interface_info save;
1695 gfc_state_data s1, s2;
1699 accept_statement (ST_INTERFACE);
1701 current_interface.ns = gfc_current_ns;
1702 save = current_interface;
1704 sym = (current_interface.type == INTERFACE_GENERIC
1705 || current_interface.type == INTERFACE_USER_OP) ? gfc_new_block : NULL;
1707 push_state (&s1, COMP_INTERFACE, sym);
1708 current_state = COMP_NONE;
1711 gfc_current_ns = gfc_get_namespace (current_interface.ns, 0);
1713 st = next_statement ();
1720 new_state = COMP_SUBROUTINE;
1721 gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
1722 gfc_new_block->formal, NULL);
1726 new_state = COMP_FUNCTION;
1727 gfc_add_explicit_interface (gfc_new_block, IFSRC_IFBODY,
1728 gfc_new_block->formal, NULL);
1731 case ST_MODULE_PROC: /* The module procedure matcher makes
1732 sure the context is correct. */
1733 accept_statement (st);
1734 gfc_free_namespace (gfc_current_ns);
1737 case ST_END_INTERFACE:
1738 gfc_free_namespace (gfc_current_ns);
1739 gfc_current_ns = current_interface.ns;
1743 gfc_error ("Unexpected %s statement in INTERFACE block at %C",
1744 gfc_ascii_statement (st));
1745 reject_statement ();
1746 gfc_free_namespace (gfc_current_ns);
1751 /* Make sure that a generic interface has only subroutines or
1752 functions and that the generic name has the right attribute. */
1753 if (current_interface.type == INTERFACE_GENERIC)
1755 if (current_state == COMP_NONE)
1757 if (new_state == COMP_FUNCTION)
1758 gfc_add_function (&sym->attr, sym->name, NULL);
1759 else if (new_state == COMP_SUBROUTINE)
1760 gfc_add_subroutine (&sym->attr, sym->name, NULL);
1762 current_state = new_state;
1766 if (new_state != current_state)
1768 if (new_state == COMP_SUBROUTINE)
1770 ("SUBROUTINE at %C does not belong in a generic function "
1773 if (new_state == COMP_FUNCTION)
1775 ("FUNCTION at %C does not belong in a generic subroutine "
1781 push_state (&s2, new_state, gfc_new_block);
1782 accept_statement (st);
1783 prog_unit = gfc_new_block;
1784 prog_unit->formal_ns = gfc_current_ns;
1785 proc_locus = gfc_current_locus;
1788 /* Read data declaration statements. */
1789 st = parse_spec (ST_NONE);
1791 if (st != ST_END_SUBROUTINE && st != ST_END_FUNCTION)
1793 gfc_error ("Unexpected %s statement at %C in INTERFACE body",
1794 gfc_ascii_statement (st));
1795 reject_statement ();
1799 current_interface = save;
1800 gfc_add_interface (prog_unit);
1803 if (current_interface.ns
1804 && current_interface.ns->proc_name
1805 && strcmp (current_interface.ns->proc_name->name,
1806 prog_unit->name) == 0)
1807 gfc_error ("INTERFACE procedure '%s' at %L has the same name as the "
1808 "enclosing procedure", prog_unit->name, &proc_locus);
1817 /* Parse a set of specification statements. Returns the statement
1818 that doesn't fit. */
1820 static gfc_statement
1821 parse_spec (gfc_statement st)
1825 verify_st_order (&ss, ST_NONE);
1827 st = next_statement ();
1837 case ST_DATA: /* Not allowed in interfaces */
1838 if (gfc_current_state () == COMP_INTERFACE)
1845 case ST_IMPLICIT_NONE:
1850 case ST_DERIVED_DECL:
1852 if (verify_st_order (&ss, st) == FAILURE)
1854 reject_statement ();
1855 st = next_statement ();
1865 case ST_DERIVED_DECL:
1871 if (gfc_current_state () != COMP_MODULE)
1873 gfc_error ("%s statement must appear in a MODULE",
1874 gfc_ascii_statement (st));
1878 if (gfc_current_ns->default_access != ACCESS_UNKNOWN)
1880 gfc_error ("%s statement at %C follows another accessibility "
1881 "specification", gfc_ascii_statement (st));
1885 gfc_current_ns->default_access = (st == ST_PUBLIC)
1886 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
1894 accept_statement (st);
1895 st = next_statement ();
1899 accept_statement (st);
1901 st = next_statement ();
1912 /* Parse a WHERE block, (not a simple WHERE statement). */
1915 parse_where_block (void)
1917 int seen_empty_else;
1922 accept_statement (ST_WHERE_BLOCK);
1923 top = gfc_state_stack->tail;
1925 push_state (&s, COMP_WHERE, gfc_new_block);
1927 d = add_statement ();
1928 d->expr = top->expr;
1934 seen_empty_else = 0;
1938 st = next_statement ();
1944 case ST_WHERE_BLOCK:
1945 parse_where_block ();
1950 accept_statement (st);
1954 if (seen_empty_else)
1957 ("ELSEWHERE statement at %C follows previous unmasked "
1962 if (new_st.expr == NULL)
1963 seen_empty_else = 1;
1965 d = new_level (gfc_state_stack->head);
1967 d->expr = new_st.expr;
1969 accept_statement (st);
1974 accept_statement (st);
1978 gfc_error ("Unexpected %s statement in WHERE block at %C",
1979 gfc_ascii_statement (st));
1980 reject_statement ();
1985 while (st != ST_END_WHERE);
1991 /* Parse a FORALL block (not a simple FORALL statement). */
1994 parse_forall_block (void)
2000 accept_statement (ST_FORALL_BLOCK);
2001 top = gfc_state_stack->tail;
2003 push_state (&s, COMP_FORALL, gfc_new_block);
2005 d = add_statement ();
2006 d->op = EXEC_FORALL;
2011 st = next_statement ();
2016 case ST_POINTER_ASSIGNMENT:
2019 accept_statement (st);
2022 case ST_WHERE_BLOCK:
2023 parse_where_block ();
2026 case ST_FORALL_BLOCK:
2027 parse_forall_block ();
2031 accept_statement (st);
2038 gfc_error ("Unexpected %s statement in FORALL block at %C",
2039 gfc_ascii_statement (st));
2041 reject_statement ();
2045 while (st != ST_END_FORALL);
2051 static gfc_statement parse_executable (gfc_statement);
2053 /* parse the statements of an IF-THEN-ELSEIF-ELSE-ENDIF block. */
2056 parse_if_block (void)
2065 accept_statement (ST_IF_BLOCK);
2067 top = gfc_state_stack->tail;
2068 push_state (&s, COMP_IF, gfc_new_block);
2070 new_st.op = EXEC_IF;
2071 d = add_statement ();
2073 d->expr = top->expr;
2079 st = parse_executable (ST_NONE);
2090 ("ELSE IF statement at %C cannot follow ELSE statement at %L",
2093 reject_statement ();
2097 d = new_level (gfc_state_stack->head);
2099 d->expr = new_st.expr;
2101 accept_statement (st);
2108 gfc_error ("Duplicate ELSE statements at %L and %C",
2110 reject_statement ();
2115 else_locus = gfc_current_locus;
2117 d = new_level (gfc_state_stack->head);
2120 accept_statement (st);
2128 unexpected_statement (st);
2132 while (st != ST_ENDIF);
2135 accept_statement (st);
2139 /* Parse a SELECT block. */
2142 parse_select_block (void)
2148 accept_statement (ST_SELECT_CASE);
2150 cp = gfc_state_stack->tail;
2151 push_state (&s, COMP_SELECT, gfc_new_block);
2153 /* Make sure that the next statement is a CASE or END SELECT. */
2156 st = next_statement ();
2159 if (st == ST_END_SELECT)
2161 /* Empty SELECT CASE is OK. */
2162 accept_statement (st);
2170 ("Expected a CASE or END SELECT statement following SELECT CASE "
2173 reject_statement ();
2176 /* At this point, we're got a nonempty select block. */
2177 cp = new_level (cp);
2180 accept_statement (st);
2184 st = parse_executable (ST_NONE);
2191 cp = new_level (gfc_state_stack->head);
2193 gfc_clear_new_st ();
2195 accept_statement (st);
2201 /* Can't have an executable statement because of
2202 parse_executable(). */
2204 unexpected_statement (st);
2208 while (st != ST_END_SELECT);
2211 accept_statement (st);
2215 /* Given a symbol, make sure it is not an iteration variable for a DO
2216 statement. This subroutine is called when the symbol is seen in a
2217 context that causes it to become redefined. If the symbol is an
2218 iterator, we generate an error message and return nonzero. */
2221 gfc_check_do_variable (gfc_symtree *st)
2225 for (s=gfc_state_stack; s; s = s->previous)
2226 if (s->do_variable == st)
2228 gfc_error_now("Variable '%s' at %C cannot be redefined inside "
2229 "loop beginning at %L", st->name, &s->head->loc);
2237 /* Checks to see if the current statement label closes an enddo.
2238 Returns 0 if not, 1 if closes an ENDDO correctly, or 2 (and issues
2239 an error) if it incorrectly closes an ENDDO. */
2242 check_do_closure (void)
2246 if (gfc_statement_label == NULL)
2249 for (p = gfc_state_stack; p; p = p->previous)
2250 if (p->state == COMP_DO)
2254 return 0; /* No loops to close */
2256 if (p->ext.end_do_label == gfc_statement_label)
2259 if (p == gfc_state_stack)
2263 ("End of nonblock DO statement at %C is within another block");
2267 /* At this point, the label doesn't terminate the innermost loop.
2268 Make sure it doesn't terminate another one. */
2269 for (; p; p = p->previous)
2270 if (p->state == COMP_DO && p->ext.end_do_label == gfc_statement_label)
2272 gfc_error ("End of nonblock DO statement at %C is interwoven "
2273 "with another DO loop");
2281 /* Parse a DO loop. Note that the ST_CYCLE and ST_EXIT statements are
2282 handled inside of parse_executable(), because they aren't really
2286 parse_do_block (void)
2293 s.ext.end_do_label = new_st.label;
2295 if (new_st.ext.iterator != NULL)
2296 stree = new_st.ext.iterator->var->symtree;
2300 accept_statement (ST_DO);
2302 top = gfc_state_stack->tail;
2303 push_state (&s, COMP_DO, gfc_new_block);
2305 s.do_variable = stree;
2307 top->block = new_level (top);
2308 top->block->op = EXEC_DO;
2311 st = parse_executable (ST_NONE);
2319 if (s.ext.end_do_label != NULL
2320 && s.ext.end_do_label != gfc_statement_label)
2322 ("Statement label in ENDDO at %C doesn't match DO label");
2324 if (gfc_statement_label != NULL)
2326 new_st.op = EXEC_NOP;
2331 case ST_IMPLIED_ENDDO:
2332 /* If the do-stmt of this DO construct has a do-construct-name,
2333 the corresponding end-do must be an end-do-stmt (with a matching
2334 name, but in that case we must have seen ST_ENDDO first).
2335 We only complain about this in pedantic mode. */
2336 if (gfc_current_block () != NULL)
2338 ("named block DO at %L requires matching ENDDO name",
2339 &gfc_current_block()->declared_at);
2344 unexpected_statement (st);
2349 accept_statement (st);
2353 /* Parse the statements of OpenMP do/parallel do. */
2355 static gfc_statement
2356 parse_omp_do (gfc_statement omp_st)
2362 accept_statement (omp_st);
2364 cp = gfc_state_stack->tail;
2365 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2366 np = new_level (cp);
2372 st = next_statement ();
2375 else if (st == ST_DO)
2378 unexpected_statement (st);
2382 if (gfc_statement_label != NULL
2383 && gfc_state_stack->previous != NULL
2384 && gfc_state_stack->previous->state == COMP_DO
2385 && gfc_state_stack->previous->ext.end_do_label == gfc_statement_label)
2393 there should be no !$OMP END DO. */
2395 return ST_IMPLIED_ENDDO;
2398 check_do_closure ();
2401 st = next_statement ();
2402 if (st == (omp_st == ST_OMP_DO ? ST_OMP_END_DO : ST_OMP_END_PARALLEL_DO))
2404 if (new_st.op == EXEC_OMP_END_NOWAIT)
2405 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2407 gcc_assert (new_st.op == EXEC_NOP);
2408 gfc_clear_new_st ();
2409 gfc_commit_symbols ();
2410 gfc_warning_check ();
2411 st = next_statement ();
2417 /* Parse the statements of OpenMP atomic directive. */
2420 parse_omp_atomic (void)
2426 accept_statement (ST_OMP_ATOMIC);
2428 cp = gfc_state_stack->tail;
2429 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2430 np = new_level (cp);
2436 st = next_statement ();
2439 else if (st == ST_ASSIGNMENT)
2442 unexpected_statement (st);
2445 accept_statement (st);
2451 /* Parse the statements of an OpenMP structured block. */
2454 parse_omp_structured_block (gfc_statement omp_st, bool workshare_stmts_only)
2456 gfc_statement st, omp_end_st;
2460 accept_statement (omp_st);
2462 cp = gfc_state_stack->tail;
2463 push_state (&s, COMP_OMP_STRUCTURED_BLOCK, NULL);
2464 np = new_level (cp);
2470 case ST_OMP_PARALLEL:
2471 omp_end_st = ST_OMP_END_PARALLEL;
2473 case ST_OMP_PARALLEL_SECTIONS:
2474 omp_end_st = ST_OMP_END_PARALLEL_SECTIONS;
2476 case ST_OMP_SECTIONS:
2477 omp_end_st = ST_OMP_END_SECTIONS;
2479 case ST_OMP_ORDERED:
2480 omp_end_st = ST_OMP_END_ORDERED;
2482 case ST_OMP_CRITICAL:
2483 omp_end_st = ST_OMP_END_CRITICAL;
2486 omp_end_st = ST_OMP_END_MASTER;
2489 omp_end_st = ST_OMP_END_SINGLE;
2491 case ST_OMP_WORKSHARE:
2492 omp_end_st = ST_OMP_END_WORKSHARE;
2494 case ST_OMP_PARALLEL_WORKSHARE:
2495 omp_end_st = ST_OMP_END_PARALLEL_WORKSHARE;
2503 if (workshare_stmts_only)
2505 /* Inside of !$omp workshare, only
2508 where statements and constructs
2509 forall statements and constructs
2513 are allowed. For !$omp critical these
2514 restrictions apply recursively. */
2517 st = next_statement ();
2528 accept_statement (st);
2531 case ST_WHERE_BLOCK:
2532 parse_where_block ();
2535 case ST_FORALL_BLOCK:
2536 parse_forall_block ();
2539 case ST_OMP_PARALLEL:
2540 case ST_OMP_PARALLEL_SECTIONS:
2541 parse_omp_structured_block (st, false);
2544 case ST_OMP_PARALLEL_WORKSHARE:
2545 case ST_OMP_CRITICAL:
2546 parse_omp_structured_block (st, true);
2549 case ST_OMP_PARALLEL_DO:
2550 st = parse_omp_do (st);
2554 parse_omp_atomic ();
2565 st = next_statement ();
2569 st = parse_executable (ST_NONE);
2572 else if (st == ST_OMP_SECTION
2573 && (omp_st == ST_OMP_SECTIONS
2574 || omp_st == ST_OMP_PARALLEL_SECTIONS))
2576 np = new_level (np);
2580 else if (st != omp_end_st)
2581 unexpected_statement (st);
2583 while (st != omp_end_st);
2587 case EXEC_OMP_END_NOWAIT:
2588 cp->ext.omp_clauses->nowait |= new_st.ext.omp_bool;
2590 case EXEC_OMP_CRITICAL:
2591 if (((cp->ext.omp_name == NULL) ^ (new_st.ext.omp_name == NULL))
2592 || (new_st.ext.omp_name != NULL
2593 && strcmp (cp->ext.omp_name, new_st.ext.omp_name) != 0))
2594 gfc_error ("Name after !$omp critical and !$omp end critical does"
2595 " not match at %C");
2596 gfc_free ((char *) new_st.ext.omp_name);
2598 case EXEC_OMP_END_SINGLE:
2599 cp->ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE]
2600 = new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE];
2601 new_st.ext.omp_clauses->lists[OMP_LIST_COPYPRIVATE] = NULL;
2602 gfc_free_omp_clauses (new_st.ext.omp_clauses);
2610 gfc_clear_new_st ();
2611 gfc_commit_symbols ();
2612 gfc_warning_check ();
2617 /* Accept a series of executable statements. We return the first
2618 statement that doesn't fit to the caller. Any block statements are
2619 passed on to the correct handler, which usually passes the buck
2622 static gfc_statement
2623 parse_executable (gfc_statement st)
2628 st = next_statement ();
2632 close_flag = check_do_closure ();
2637 case ST_END_PROGRAM:
2640 case ST_END_FUNCTION:
2644 case ST_END_SUBROUTINE:
2649 case ST_SELECT_CASE:
2651 ("%s statement at %C cannot terminate a non-block DO loop",
2652 gfc_ascii_statement (st));
2668 accept_statement (st);
2669 if (close_flag == 1)
2670 return ST_IMPLIED_ENDDO;
2677 case ST_SELECT_CASE:
2678 parse_select_block ();
2683 if (check_do_closure () == 1)
2684 return ST_IMPLIED_ENDDO;
2687 case ST_WHERE_BLOCK:
2688 parse_where_block ();
2691 case ST_FORALL_BLOCK:
2692 parse_forall_block ();
2695 case ST_OMP_PARALLEL:
2696 case ST_OMP_PARALLEL_SECTIONS:
2697 case ST_OMP_SECTIONS:
2698 case ST_OMP_ORDERED:
2699 case ST_OMP_CRITICAL:
2702 parse_omp_structured_block (st, false);
2705 case ST_OMP_WORKSHARE:
2706 case ST_OMP_PARALLEL_WORKSHARE:
2707 parse_omp_structured_block (st, true);
2711 case ST_OMP_PARALLEL_DO:
2712 st = parse_omp_do (st);
2713 if (st == ST_IMPLIED_ENDDO)
2718 parse_omp_atomic ();
2725 st = next_statement ();
2730 /* Parse a series of contained program units. */
2732 static void parse_progunit (gfc_statement);
2735 /* Fix the symbols for sibling functions. These are incorrectly added to
2736 the child namespace as the parser didn't know about this procedure. */
2739 gfc_fixup_sibling_symbols (gfc_symbol * sym, gfc_namespace * siblings)
2743 gfc_symbol *old_sym;
2745 sym->attr.referenced = 1;
2746 for (ns = siblings; ns; ns = ns->sibling)
2748 gfc_find_sym_tree (sym->name, ns, 0, &st);
2750 if (!st || (st->n.sym->attr.dummy && ns == st->n.sym->ns))
2753 old_sym = st->n.sym;
2754 if ((old_sym->attr.flavor == FL_PROCEDURE
2755 || old_sym->ts.type == BT_UNKNOWN)
2756 && old_sym->ns == ns
2757 && ! old_sym->attr.contained)
2759 /* Replace it with the symbol from the parent namespace. */
2763 /* Free the old (local) symbol. */
2765 if (old_sym->refs == 0)
2766 gfc_free_symbol (old_sym);
2769 /* Do the same for any contained procedures. */
2770 gfc_fixup_sibling_symbols (sym, ns->contained);
2775 parse_contained (int module)
2777 gfc_namespace *ns, *parent_ns;
2778 gfc_state_data s1, s2;
2782 int contains_statements = 0;
2784 push_state (&s1, COMP_CONTAINS, NULL);
2785 parent_ns = gfc_current_ns;
2789 gfc_current_ns = gfc_get_namespace (parent_ns, 1);
2791 gfc_current_ns->sibling = parent_ns->contained;
2792 parent_ns->contained = gfc_current_ns;
2794 st = next_statement ();
2803 contains_statements = 1;
2804 accept_statement (st);
2807 (st == ST_FUNCTION) ? COMP_FUNCTION : COMP_SUBROUTINE,
2810 /* For internal procedures, create/update the symbol in the
2811 parent namespace. */
2815 if (gfc_get_symbol (gfc_new_block->name, parent_ns, &sym))
2817 ("Contained procedure '%s' at %C is already ambiguous",
2818 gfc_new_block->name);
2821 if (gfc_add_procedure (&sym->attr, PROC_INTERNAL, sym->name,
2822 &gfc_new_block->declared_at) ==
2825 if (st == ST_FUNCTION)
2826 gfc_add_function (&sym->attr, sym->name,
2827 &gfc_new_block->declared_at);
2829 gfc_add_subroutine (&sym->attr, sym->name,
2830 &gfc_new_block->declared_at);
2834 gfc_commit_symbols ();
2837 sym = gfc_new_block;
2839 /* Mark this as a contained function, so it isn't replaced
2840 by other module functions. */
2841 sym->attr.contained = 1;
2842 sym->attr.referenced = 1;
2844 parse_progunit (ST_NONE);
2846 /* Fix up any sibling functions that refer to this one. */
2847 gfc_fixup_sibling_symbols (sym, gfc_current_ns);
2848 /* Or refer to any of its alternate entry points. */
2849 for (el = gfc_current_ns->entries; el; el = el->next)
2850 gfc_fixup_sibling_symbols (el->sym, gfc_current_ns);
2852 gfc_current_ns->code = s2.head;
2853 gfc_current_ns = parent_ns;
2858 /* These statements are associated with the end of the host
2860 case ST_END_FUNCTION:
2862 case ST_END_PROGRAM:
2863 case ST_END_SUBROUTINE:
2864 accept_statement (st);
2868 gfc_error ("Unexpected %s statement in CONTAINS section at %C",
2869 gfc_ascii_statement (st));
2870 reject_statement ();
2874 while (st != ST_END_FUNCTION && st != ST_END_SUBROUTINE
2875 && st != ST_END_MODULE && st != ST_END_PROGRAM);
2877 /* The first namespace in the list is guaranteed to not have
2878 anything (worthwhile) in it. */
2880 gfc_current_ns = parent_ns;
2882 ns = gfc_current_ns->contained;
2883 gfc_current_ns->contained = ns->sibling;
2884 gfc_free_namespace (ns);
2887 if (!contains_statements)
2888 /* This is valid in Fortran 2008. */
2889 gfc_notify_std (GFC_STD_GNU, "Extension: "
2890 "CONTAINS statement without FUNCTION "
2891 "or SUBROUTINE statement at %C");
2895 /* Parse a PROGRAM, SUBROUTINE or FUNCTION unit. */
2898 parse_progunit (gfc_statement st)
2903 st = parse_spec (st);
2913 accept_statement (st);
2923 st = parse_executable (st);
2934 accept_statement (st);
2941 unexpected_statement (st);
2942 reject_statement ();
2943 st = next_statement ();
2949 for (p = gfc_state_stack; p; p = p->previous)
2950 if (p->state == COMP_CONTAINS)
2953 if (gfc_find_state (COMP_MODULE) == SUCCESS)
2958 gfc_error ("CONTAINS statement at %C is already in a contained "
2960 st = next_statement ();
2964 parse_contained (0);
2967 gfc_current_ns->code = gfc_state_stack->head;
2971 /* Come here to complain about a global symbol already in use as
2975 global_used (gfc_gsymbol *sym, locus *where)
2980 where = &gfc_current_locus;
2990 case GSYM_SUBROUTINE:
2991 name = "SUBROUTINE";
2996 case GSYM_BLOCK_DATA:
2997 name = "BLOCK DATA";
3003 gfc_internal_error ("gfc_gsymbol_type(): Bad type");
3007 gfc_error("Global name '%s' at %L is already being used as a %s at %L",
3008 sym->name, where, name, &sym->where);
3012 /* Parse a block data program unit. */
3015 parse_block_data (void)
3018 static locus blank_locus;
3019 static int blank_block=0;
3022 gfc_current_ns->proc_name = gfc_new_block;
3023 gfc_current_ns->is_block_data = 1;
3025 if (gfc_new_block == NULL)
3028 gfc_error ("Blank BLOCK DATA at %C conflicts with "
3029 "prior BLOCK DATA at %L", &blank_locus);
3033 blank_locus = gfc_current_locus;
3038 s = gfc_get_gsymbol (gfc_new_block->name);
3039 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_BLOCK_DATA))
3040 global_used(s, NULL);
3043 s->type = GSYM_BLOCK_DATA;
3044 s->where = gfc_current_locus;
3049 st = parse_spec (ST_NONE);
3051 while (st != ST_END_BLOCK_DATA)
3053 gfc_error ("Unexpected %s statement in BLOCK DATA at %C",
3054 gfc_ascii_statement (st));
3055 reject_statement ();
3056 st = next_statement ();
3061 /* Parse a module subprogram. */
3069 s = gfc_get_gsymbol (gfc_new_block->name);
3070 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_MODULE))
3071 global_used(s, NULL);
3074 s->type = GSYM_MODULE;
3075 s->where = gfc_current_locus;
3079 st = parse_spec (ST_NONE);
3088 parse_contained (1);
3092 accept_statement (st);
3096 gfc_error ("Unexpected %s statement in MODULE at %C",
3097 gfc_ascii_statement (st));
3099 reject_statement ();
3100 st = next_statement ();
3106 /* Add a procedure name to the global symbol table. */
3109 add_global_procedure (int sub)
3113 s = gfc_get_gsymbol(gfc_new_block->name);
3116 || (s->type != GSYM_UNKNOWN && s->type != (sub ? GSYM_SUBROUTINE : GSYM_FUNCTION)))
3117 global_used(s, NULL);
3120 s->type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
3121 s->where = gfc_current_locus;
3127 /* Add a program to the global symbol table. */
3130 add_global_program (void)
3134 if (gfc_new_block == NULL)
3136 s = gfc_get_gsymbol (gfc_new_block->name);
3138 if (s->defined || (s->type != GSYM_UNKNOWN && s->type != GSYM_PROGRAM))
3139 global_used(s, NULL);
3142 s->type = GSYM_PROGRAM;
3143 s->where = gfc_current_locus;
3149 /* Top level parser. */
3152 gfc_parse_file (void)
3154 int seen_program, errors_before, errors;
3155 gfc_state_data top, s;
3159 top.state = COMP_NONE;
3161 top.previous = NULL;
3162 top.head = top.tail = NULL;
3163 top.do_variable = NULL;
3165 gfc_state_stack = ⊤
3167 gfc_clear_new_st ();
3169 gfc_statement_label = NULL;
3171 if (setjmp (eof_buf))
3172 return FAILURE; /* Come here on unexpected EOF */
3176 /* Exit early for empty files. */
3182 st = next_statement ();
3191 goto duplicate_main;
3193 prog_locus = gfc_current_locus;
3195 push_state (&s, COMP_PROGRAM, gfc_new_block);
3196 main_program_symbol(gfc_current_ns);
3197 accept_statement (st);
3198 add_global_program ();
3199 parse_progunit (ST_NONE);
3203 add_global_procedure (1);
3204 push_state (&s, COMP_SUBROUTINE, gfc_new_block);
3205 accept_statement (st);
3206 parse_progunit (ST_NONE);
3210 add_global_procedure (0);
3211 push_state (&s, COMP_FUNCTION, gfc_new_block);
3212 accept_statement (st);
3213 parse_progunit (ST_NONE);
3217 push_state (&s, COMP_BLOCK_DATA, gfc_new_block);
3218 accept_statement (st);
3219 parse_block_data ();
3223 push_state (&s, COMP_MODULE, gfc_new_block);
3224 accept_statement (st);
3226 gfc_get_errors (NULL, &errors_before);
3230 /* Anything else starts a nameless main program block. */
3233 goto duplicate_main;
3235 prog_locus = gfc_current_locus;
3237 push_state (&s, COMP_PROGRAM, gfc_new_block);
3238 main_program_symbol(gfc_current_ns);
3239 parse_progunit (st);
3243 gfc_current_ns->code = s.head;
3245 gfc_resolve (gfc_current_ns);
3247 /* Dump the parse tree if requested. */
3248 if (gfc_option.verbose)
3249 gfc_show_namespace (gfc_current_ns);
3251 gfc_get_errors (NULL, &errors);
3252 if (s.state == COMP_MODULE)
3254 gfc_dump_module (s.sym->name, errors_before == errors);
3256 gfc_generate_module_code (gfc_current_ns);
3261 gfc_generate_code (gfc_current_ns);
3272 /* If we see a duplicate main program, shut down. If the second
3273 instance is an implied main program, ie data decls or executable
3274 statements, we're in for lots of errors. */
3275 gfc_error ("Two main PROGRAMs at %L and %C", &prog_locus);
3276 reject_statement ();