1 /* Matching subroutines in all sizes, shapes and colors.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 2010 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
30 int gfc_matching_procptr_assignment = 0;
31 bool gfc_matching_prefix = false;
33 /* Stack of SELECT TYPE statements. */
34 gfc_select_type_stack *select_type_stack = NULL;
36 /* For debugging and diagnostic purposes. Return the textual representation
37 of the intrinsic operator OP. */
39 gfc_op2string (gfc_intrinsic_op op)
47 case INTRINSIC_UMINUS:
53 case INTRINSIC_CONCAT:
57 case INTRINSIC_DIVIDE:
96 case INTRINSIC_ASSIGN:
99 case INTRINSIC_PARENTHESES:
106 gfc_internal_error ("gfc_op2string(): Bad code");
111 /******************** Generic matching subroutines ************************/
113 /* This function scans the current statement counting the opened and closed
114 parenthesis to make sure they are balanced. */
117 gfc_match_parens (void)
119 locus old_loc, where;
123 old_loc = gfc_current_locus;
130 c = gfc_next_char_literal (instring);
133 if (quote == ' ' && ((c == '\'') || (c == '"')))
139 if (quote != ' ' && c == quote)
146 if (c == '(' && quote == ' ')
149 where = gfc_current_locus;
151 if (c == ')' && quote == ' ')
154 where = gfc_current_locus;
158 gfc_current_locus = old_loc;
162 gfc_error ("Missing ')' in statement at or before %L", &where);
167 gfc_error ("Missing '(' in statement at or before %L", &where);
175 /* See if the next character is a special character that has
176 escaped by a \ via the -fbackslash option. */
179 gfc_match_special_char (gfc_char_t *res)
187 switch ((c = gfc_next_char_literal (1)))
220 /* Hexadecimal form of wide characters. */
221 len = (c == 'x' ? 2 : (c == 'u' ? 4 : 8));
223 for (i = 0; i < len; i++)
225 char buf[2] = { '\0', '\0' };
227 c = gfc_next_char_literal (1);
228 if (!gfc_wide_fits_in_byte (c)
229 || !gfc_check_digit ((unsigned char) c, 16))
232 buf[0] = (unsigned char) c;
234 n += strtol (buf, NULL, 16);
240 /* Unknown backslash codes are simply not expanded. */
249 /* In free form, match at least one space. Always matches in fixed
253 gfc_match_space (void)
258 if (gfc_current_form == FORM_FIXED)
261 old_loc = gfc_current_locus;
263 c = gfc_next_ascii_char ();
264 if (!gfc_is_whitespace (c))
266 gfc_current_locus = old_loc;
270 gfc_gobble_whitespace ();
276 /* Match an end of statement. End of statement is optional
277 whitespace, followed by a ';' or '\n' or comment '!'. If a
278 semicolon is found, we continue to eat whitespace and semicolons. */
291 old_loc = gfc_current_locus;
292 gfc_gobble_whitespace ();
294 c = gfc_next_ascii_char ();
300 c = gfc_next_ascii_char ();
317 gfc_current_locus = old_loc;
318 return (flag) ? MATCH_YES : MATCH_NO;
322 /* Match a literal integer on the input, setting the value on
323 MATCH_YES. Literal ints occur in kind-parameters as well as
324 old-style character length specifications. If cnt is non-NULL it
325 will be set to the number of digits. */
328 gfc_match_small_literal_int (int *value, int *cnt)
334 old_loc = gfc_current_locus;
337 gfc_gobble_whitespace ();
338 c = gfc_next_ascii_char ();
344 gfc_current_locus = old_loc;
353 old_loc = gfc_current_locus;
354 c = gfc_next_ascii_char ();
359 i = 10 * i + c - '0';
364 gfc_error ("Integer too large at %C");
369 gfc_current_locus = old_loc;
378 /* Match a small, constant integer expression, like in a kind
379 statement. On MATCH_YES, 'value' is set. */
382 gfc_match_small_int (int *value)
389 m = gfc_match_expr (&expr);
393 p = gfc_extract_int (expr, &i);
394 gfc_free_expr (expr);
407 /* This function is the same as the gfc_match_small_int, except that
408 we're keeping the pointer to the expr. This function could just be
409 removed and the previously mentioned one modified, though all calls
410 to it would have to be modified then (and there were a number of
411 them). Return MATCH_ERROR if fail to extract the int; otherwise,
412 return the result of gfc_match_expr(). The expr (if any) that was
413 matched is returned in the parameter expr. */
416 gfc_match_small_int_expr (int *value, gfc_expr **expr)
422 m = gfc_match_expr (expr);
426 p = gfc_extract_int (*expr, &i);
439 /* Matches a statement label. Uses gfc_match_small_literal_int() to
440 do most of the work. */
443 gfc_match_st_label (gfc_st_label **label)
449 old_loc = gfc_current_locus;
451 m = gfc_match_small_literal_int (&i, &cnt);
457 gfc_error ("Too many digits in statement label at %C");
463 gfc_error ("Statement label at %C is zero");
467 *label = gfc_get_st_label (i);
472 gfc_current_locus = old_loc;
477 /* Match and validate a label associated with a named IF, DO or SELECT
478 statement. If the symbol does not have the label attribute, we add
479 it. We also make sure the symbol does not refer to another
480 (active) block. A matched label is pointed to by gfc_new_block. */
483 gfc_match_label (void)
485 char name[GFC_MAX_SYMBOL_LEN + 1];
488 gfc_new_block = NULL;
490 m = gfc_match (" %n :", name);
494 if (gfc_get_symbol (name, NULL, &gfc_new_block))
496 gfc_error ("Label name '%s' at %C is ambiguous", name);
500 if (gfc_new_block->attr.flavor == FL_LABEL)
502 gfc_error ("Duplicate construct label '%s' at %C", name);
506 if (gfc_add_flavor (&gfc_new_block->attr, FL_LABEL,
507 gfc_new_block->name, NULL) == FAILURE)
514 /* See if the current input looks like a name of some sort. Modifies
515 the passed buffer which must be GFC_MAX_SYMBOL_LEN+1 bytes long.
516 Note that options.c restricts max_identifier_length to not more
517 than GFC_MAX_SYMBOL_LEN. */
520 gfc_match_name (char *buffer)
526 old_loc = gfc_current_locus;
527 gfc_gobble_whitespace ();
529 c = gfc_next_ascii_char ();
530 if (!(ISALPHA (c) || (c == '_' && gfc_option.flag_allow_leading_underscore)))
532 if (gfc_error_flag_test() == 0 && c != '(')
533 gfc_error ("Invalid character in name at %C");
534 gfc_current_locus = old_loc;
544 if (i > gfc_option.max_identifier_length)
546 gfc_error ("Name at %C is too long");
550 old_loc = gfc_current_locus;
551 c = gfc_next_ascii_char ();
553 while (ISALNUM (c) || c == '_' || (gfc_option.flag_dollar_ok && c == '$'));
555 if (c == '$' && !gfc_option.flag_dollar_ok)
557 gfc_error ("Invalid character '$' at %C. Use -fdollar-ok to allow it "
563 gfc_current_locus = old_loc;
569 /* Match a valid name for C, which is almost the same as for Fortran,
570 except that you can start with an underscore, etc.. It could have
571 been done by modifying the gfc_match_name, but this way other
572 things C allows can be added, such as no limits on the length.
573 Right now, the length is limited to the same thing as Fortran..
574 Also, by rewriting it, we use the gfc_next_char_C() to prevent the
575 input characters from being automatically lower cased, since C is
576 case sensitive. The parameter, buffer, is used to return the name
577 that is matched. Return MATCH_ERROR if the name is too long
578 (though this is a self-imposed limit), MATCH_NO if what we're
579 seeing isn't a name, and MATCH_YES if we successfully match a C
583 gfc_match_name_C (char *buffer)
589 old_loc = gfc_current_locus;
590 gfc_gobble_whitespace ();
592 /* Get the next char (first possible char of name) and see if
593 it's valid for C (either a letter or an underscore). */
594 c = gfc_next_char_literal (1);
596 /* If the user put nothing expect spaces between the quotes, it is valid
597 and simply means there is no name= specifier and the name is the fortran
598 symbol name, all lowercase. */
599 if (c == '"' || c == '\'')
602 gfc_current_locus = old_loc;
606 if (!ISALPHA (c) && c != '_')
608 gfc_error ("Invalid C name in NAME= specifier at %C");
612 /* Continue to read valid variable name characters. */
615 gcc_assert (gfc_wide_fits_in_byte (c));
617 buffer[i++] = (unsigned char) c;
619 /* C does not define a maximum length of variable names, to my
620 knowledge, but the compiler typically places a limit on them.
621 For now, i'll use the same as the fortran limit for simplicity,
622 but this may need to be changed to a dynamic buffer that can
623 be realloc'ed here if necessary, or more likely, a larger
625 if (i > gfc_option.max_identifier_length)
627 gfc_error ("Name at %C is too long");
631 old_loc = gfc_current_locus;
633 /* Get next char; param means we're in a string. */
634 c = gfc_next_char_literal (1);
635 } while (ISALNUM (c) || c == '_');
638 gfc_current_locus = old_loc;
640 /* See if we stopped because of whitespace. */
643 gfc_gobble_whitespace ();
644 c = gfc_peek_ascii_char ();
645 if (c != '"' && c != '\'')
647 gfc_error ("Embedded space in NAME= specifier at %C");
652 /* If we stopped because we had an invalid character for a C name, report
653 that to the user by returning MATCH_NO. */
654 if (c != '"' && c != '\'')
656 gfc_error ("Invalid C name in NAME= specifier at %C");
664 /* Match a symbol on the input. Modifies the pointer to the symbol
665 pointer if successful. */
668 gfc_match_sym_tree (gfc_symtree **matched_symbol, int host_assoc)
670 char buffer[GFC_MAX_SYMBOL_LEN + 1];
673 m = gfc_match_name (buffer);
678 return (gfc_get_ha_sym_tree (buffer, matched_symbol))
679 ? MATCH_ERROR : MATCH_YES;
681 if (gfc_get_sym_tree (buffer, NULL, matched_symbol, false))
689 gfc_match_symbol (gfc_symbol **matched_symbol, int host_assoc)
694 m = gfc_match_sym_tree (&st, host_assoc);
699 *matched_symbol = st->n.sym;
701 *matched_symbol = NULL;
704 *matched_symbol = NULL;
709 /* Match an intrinsic operator. Returns an INTRINSIC enum. While matching,
710 we always find INTRINSIC_PLUS before INTRINSIC_UPLUS. We work around this
714 gfc_match_intrinsic_op (gfc_intrinsic_op *result)
716 locus orig_loc = gfc_current_locus;
719 gfc_gobble_whitespace ();
720 ch = gfc_next_ascii_char ();
725 *result = INTRINSIC_PLUS;
730 *result = INTRINSIC_MINUS;
734 if (gfc_next_ascii_char () == '=')
737 *result = INTRINSIC_EQ;
743 if (gfc_peek_ascii_char () == '=')
746 gfc_next_ascii_char ();
747 *result = INTRINSIC_LE;
751 *result = INTRINSIC_LT;
755 if (gfc_peek_ascii_char () == '=')
758 gfc_next_ascii_char ();
759 *result = INTRINSIC_GE;
763 *result = INTRINSIC_GT;
767 if (gfc_peek_ascii_char () == '*')
770 gfc_next_ascii_char ();
771 *result = INTRINSIC_POWER;
775 *result = INTRINSIC_TIMES;
779 ch = gfc_peek_ascii_char ();
783 gfc_next_ascii_char ();
784 *result = INTRINSIC_NE;
790 gfc_next_ascii_char ();
791 *result = INTRINSIC_CONCAT;
795 *result = INTRINSIC_DIVIDE;
799 ch = gfc_next_ascii_char ();
803 if (gfc_next_ascii_char () == 'n'
804 && gfc_next_ascii_char () == 'd'
805 && gfc_next_ascii_char () == '.')
807 /* Matched ".and.". */
808 *result = INTRINSIC_AND;
814 if (gfc_next_ascii_char () == 'q')
816 ch = gfc_next_ascii_char ();
819 /* Matched ".eq.". */
820 *result = INTRINSIC_EQ_OS;
825 if (gfc_next_ascii_char () == '.')
827 /* Matched ".eqv.". */
828 *result = INTRINSIC_EQV;
836 ch = gfc_next_ascii_char ();
839 if (gfc_next_ascii_char () == '.')
841 /* Matched ".ge.". */
842 *result = INTRINSIC_GE_OS;
848 if (gfc_next_ascii_char () == '.')
850 /* Matched ".gt.". */
851 *result = INTRINSIC_GT_OS;
858 ch = gfc_next_ascii_char ();
861 if (gfc_next_ascii_char () == '.')
863 /* Matched ".le.". */
864 *result = INTRINSIC_LE_OS;
870 if (gfc_next_ascii_char () == '.')
872 /* Matched ".lt.". */
873 *result = INTRINSIC_LT_OS;
880 ch = gfc_next_ascii_char ();
883 ch = gfc_next_ascii_char ();
886 /* Matched ".ne.". */
887 *result = INTRINSIC_NE_OS;
892 if (gfc_next_ascii_char () == 'v'
893 && gfc_next_ascii_char () == '.')
895 /* Matched ".neqv.". */
896 *result = INTRINSIC_NEQV;
903 if (gfc_next_ascii_char () == 't'
904 && gfc_next_ascii_char () == '.')
906 /* Matched ".not.". */
907 *result = INTRINSIC_NOT;
914 if (gfc_next_ascii_char () == 'r'
915 && gfc_next_ascii_char () == '.')
917 /* Matched ".or.". */
918 *result = INTRINSIC_OR;
932 gfc_current_locus = orig_loc;
937 /* Match a loop control phrase:
939 <LVALUE> = <EXPR>, <EXPR> [, <EXPR> ]
941 If the final integer expression is not present, a constant unity
942 expression is returned. We don't return MATCH_ERROR until after
943 the equals sign is seen. */
946 gfc_match_iterator (gfc_iterator *iter, int init_flag)
948 char name[GFC_MAX_SYMBOL_LEN + 1];
949 gfc_expr *var, *e1, *e2, *e3;
955 /* Match the start of an iterator without affecting the symbol table. */
957 start = gfc_current_locus;
958 m = gfc_match (" %n =", name);
959 gfc_current_locus = start;
964 m = gfc_match_variable (&var, 0);
968 /* F2008, C617 & C565. */
969 if (var->symtree->n.sym->attr.codimension)
971 gfc_error ("Loop variable at %C cannot be a coarray");
975 if (var->ref != NULL)
977 gfc_error ("Loop variable at %C cannot be a sub-component");
981 if (var->symtree->n.sym->attr.intent == INTENT_IN)
983 gfc_error ("Loop variable '%s' at %C cannot be INTENT(IN)",
984 var->symtree->n.sym->name);
988 gfc_match_char ('=');
990 var->symtree->n.sym->attr.implied_index = 1;
992 m = init_flag ? gfc_match_init_expr (&e1) : gfc_match_expr (&e1);
995 if (m == MATCH_ERROR)
998 if (gfc_match_char (',') != MATCH_YES)
1001 m = init_flag ? gfc_match_init_expr (&e2) : gfc_match_expr (&e2);
1004 if (m == MATCH_ERROR)
1007 if (gfc_match_char (',') != MATCH_YES)
1009 e3 = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
1013 m = init_flag ? gfc_match_init_expr (&e3) : gfc_match_expr (&e3);
1014 if (m == MATCH_ERROR)
1018 gfc_error ("Expected a step value in iterator at %C");
1030 gfc_error ("Syntax error in iterator at %C");
1041 /* Tries to match the next non-whitespace character on the input.
1042 This subroutine does not return MATCH_ERROR. */
1045 gfc_match_char (char c)
1049 where = gfc_current_locus;
1050 gfc_gobble_whitespace ();
1052 if (gfc_next_ascii_char () == c)
1055 gfc_current_locus = where;
1060 /* General purpose matching subroutine. The target string is a
1061 scanf-like format string in which spaces correspond to arbitrary
1062 whitespace (including no whitespace), characters correspond to
1063 themselves. The %-codes are:
1065 %% Literal percent sign
1066 %e Expression, pointer to a pointer is set
1067 %s Symbol, pointer to the symbol is set
1068 %n Name, character buffer is set to name
1069 %t Matches end of statement.
1070 %o Matches an intrinsic operator, returned as an INTRINSIC enum.
1071 %l Matches a statement label
1072 %v Matches a variable expression (an lvalue)
1073 % Matches a required space (in free form) and optional spaces. */
1076 gfc_match (const char *target, ...)
1078 gfc_st_label **label;
1087 old_loc = gfc_current_locus;
1088 va_start (argp, target);
1098 gfc_gobble_whitespace ();
1109 vp = va_arg (argp, void **);
1110 n = gfc_match_expr ((gfc_expr **) vp);
1121 vp = va_arg (argp, void **);
1122 n = gfc_match_variable ((gfc_expr **) vp, 0);
1133 vp = va_arg (argp, void **);
1134 n = gfc_match_symbol ((gfc_symbol **) vp, 0);
1145 np = va_arg (argp, char *);
1146 n = gfc_match_name (np);
1157 label = va_arg (argp, gfc_st_label **);
1158 n = gfc_match_st_label (label);
1169 ip = va_arg (argp, int *);
1170 n = gfc_match_intrinsic_op ((gfc_intrinsic_op *) ip);
1181 if (gfc_match_eos () != MATCH_YES)
1189 if (gfc_match_space () == MATCH_YES)
1195 break; /* Fall through to character matcher. */
1198 gfc_internal_error ("gfc_match(): Bad match code %c", c);
1203 /* gfc_next_ascii_char converts characters to lower-case, so we shouldn't
1204 expect an upper case character here! */
1205 gcc_assert (TOLOWER (c) == c);
1207 if (c == gfc_next_ascii_char ())
1217 /* Clean up after a failed match. */
1218 gfc_current_locus = old_loc;
1219 va_start (argp, target);
1222 for (; matches > 0; matches--)
1224 while (*p++ != '%');
1232 /* Matches that don't have to be undone */
1237 (void) va_arg (argp, void **);
1242 vp = va_arg (argp, void **);
1243 gfc_free_expr ((struct gfc_expr *)*vp);
1256 /*********************** Statement level matching **********************/
1258 /* Matches the start of a program unit, which is the program keyword
1259 followed by an obligatory symbol. */
1262 gfc_match_program (void)
1267 m = gfc_match ("% %s%t", &sym);
1271 gfc_error ("Invalid form of PROGRAM statement at %C");
1275 if (m == MATCH_ERROR)
1278 if (gfc_add_flavor (&sym->attr, FL_PROGRAM, sym->name, NULL) == FAILURE)
1281 gfc_new_block = sym;
1287 /* Match a simple assignment statement. */
1290 gfc_match_assignment (void)
1292 gfc_expr *lvalue, *rvalue;
1296 old_loc = gfc_current_locus;
1299 m = gfc_match (" %v =", &lvalue);
1302 gfc_current_locus = old_loc;
1303 gfc_free_expr (lvalue);
1308 m = gfc_match (" %e%t", &rvalue);
1311 gfc_current_locus = old_loc;
1312 gfc_free_expr (lvalue);
1313 gfc_free_expr (rvalue);
1317 gfc_set_sym_referenced (lvalue->symtree->n.sym);
1319 new_st.op = EXEC_ASSIGN;
1320 new_st.expr1 = lvalue;
1321 new_st.expr2 = rvalue;
1323 gfc_check_do_variable (lvalue->symtree);
1329 /* Match a pointer assignment statement. */
1332 gfc_match_pointer_assignment (void)
1334 gfc_expr *lvalue, *rvalue;
1338 old_loc = gfc_current_locus;
1340 lvalue = rvalue = NULL;
1341 gfc_matching_procptr_assignment = 0;
1343 m = gfc_match (" %v =>", &lvalue);
1350 if (lvalue->symtree->n.sym->attr.proc_pointer
1351 || gfc_is_proc_ptr_comp (lvalue, NULL))
1352 gfc_matching_procptr_assignment = 1;
1354 m = gfc_match (" %e%t", &rvalue);
1355 gfc_matching_procptr_assignment = 0;
1359 new_st.op = EXEC_POINTER_ASSIGN;
1360 new_st.expr1 = lvalue;
1361 new_st.expr2 = rvalue;
1366 gfc_current_locus = old_loc;
1367 gfc_free_expr (lvalue);
1368 gfc_free_expr (rvalue);
1373 /* We try to match an easy arithmetic IF statement. This only happens
1374 when just after having encountered a simple IF statement. This code
1375 is really duplicate with parts of the gfc_match_if code, but this is
1379 match_arithmetic_if (void)
1381 gfc_st_label *l1, *l2, *l3;
1385 m = gfc_match (" ( %e ) %l , %l , %l%t", &expr, &l1, &l2, &l3);
1389 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1390 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1391 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1393 gfc_free_expr (expr);
1397 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1398 "statement at %C") == FAILURE)
1401 new_st.op = EXEC_ARITHMETIC_IF;
1402 new_st.expr1 = expr;
1411 /* The IF statement is a bit of a pain. First of all, there are three
1412 forms of it, the simple IF, the IF that starts a block and the
1415 There is a problem with the simple IF and that is the fact that we
1416 only have a single level of undo information on symbols. What this
1417 means is for a simple IF, we must re-match the whole IF statement
1418 multiple times in order to guarantee that the symbol table ends up
1419 in the proper state. */
1421 static match match_simple_forall (void);
1422 static match match_simple_where (void);
1425 gfc_match_if (gfc_statement *if_type)
1428 gfc_st_label *l1, *l2, *l3;
1429 locus old_loc, old_loc2;
1433 n = gfc_match_label ();
1434 if (n == MATCH_ERROR)
1437 old_loc = gfc_current_locus;
1439 m = gfc_match (" if ( %e", &expr);
1443 old_loc2 = gfc_current_locus;
1444 gfc_current_locus = old_loc;
1446 if (gfc_match_parens () == MATCH_ERROR)
1449 gfc_current_locus = old_loc2;
1451 if (gfc_match_char (')') != MATCH_YES)
1453 gfc_error ("Syntax error in IF-expression at %C");
1454 gfc_free_expr (expr);
1458 m = gfc_match (" %l , %l , %l%t", &l1, &l2, &l3);
1464 gfc_error ("Block label not appropriate for arithmetic IF "
1466 gfc_free_expr (expr);
1470 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1471 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1472 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1474 gfc_free_expr (expr);
1478 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1479 "statement at %C") == FAILURE)
1482 new_st.op = EXEC_ARITHMETIC_IF;
1483 new_st.expr1 = expr;
1488 *if_type = ST_ARITHMETIC_IF;
1492 if (gfc_match (" then%t") == MATCH_YES)
1494 new_st.op = EXEC_IF;
1495 new_st.expr1 = expr;
1496 *if_type = ST_IF_BLOCK;
1502 gfc_error ("Block label is not appropriate for IF statement at %C");
1503 gfc_free_expr (expr);
1507 /* At this point the only thing left is a simple IF statement. At
1508 this point, n has to be MATCH_NO, so we don't have to worry about
1509 re-matching a block label. From what we've got so far, try
1510 matching an assignment. */
1512 *if_type = ST_SIMPLE_IF;
1514 m = gfc_match_assignment ();
1518 gfc_free_expr (expr);
1519 gfc_undo_symbols ();
1520 gfc_current_locus = old_loc;
1522 /* m can be MATCH_NO or MATCH_ERROR, here. For MATCH_ERROR, a mangled
1523 assignment was found. For MATCH_NO, continue to call the various
1525 if (m == MATCH_ERROR)
1528 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1530 m = gfc_match_pointer_assignment ();
1534 gfc_free_expr (expr);
1535 gfc_undo_symbols ();
1536 gfc_current_locus = old_loc;
1538 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1540 /* Look at the next keyword to see which matcher to call. Matching
1541 the keyword doesn't affect the symbol table, so we don't have to
1542 restore between tries. */
1544 #define match(string, subr, statement) \
1545 if (gfc_match(string) == MATCH_YES) { m = subr(); goto got_match; }
1549 match ("allocate", gfc_match_allocate, ST_ALLOCATE)
1550 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT)
1551 match ("backspace", gfc_match_backspace, ST_BACKSPACE)
1552 match ("call", gfc_match_call, ST_CALL)
1553 match ("close", gfc_match_close, ST_CLOSE)
1554 match ("continue", gfc_match_continue, ST_CONTINUE)
1555 match ("cycle", gfc_match_cycle, ST_CYCLE)
1556 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE)
1557 match ("end file", gfc_match_endfile, ST_END_FILE)
1558 match ("error stop", gfc_match_error_stop, ST_ERROR_STOP)
1559 match ("exit", gfc_match_exit, ST_EXIT)
1560 match ("flush", gfc_match_flush, ST_FLUSH)
1561 match ("forall", match_simple_forall, ST_FORALL)
1562 match ("go to", gfc_match_goto, ST_GOTO)
1563 match ("if", match_arithmetic_if, ST_ARITHMETIC_IF)
1564 match ("inquire", gfc_match_inquire, ST_INQUIRE)
1565 match ("nullify", gfc_match_nullify, ST_NULLIFY)
1566 match ("open", gfc_match_open, ST_OPEN)
1567 match ("pause", gfc_match_pause, ST_NONE)
1568 match ("print", gfc_match_print, ST_WRITE)
1569 match ("read", gfc_match_read, ST_READ)
1570 match ("return", gfc_match_return, ST_RETURN)
1571 match ("rewind", gfc_match_rewind, ST_REWIND)
1572 match ("stop", gfc_match_stop, ST_STOP)
1573 match ("wait", gfc_match_wait, ST_WAIT)
1574 match ("sync all", gfc_match_sync_all, ST_SYNC_CALL);
1575 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
1576 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
1577 match ("where", match_simple_where, ST_WHERE)
1578 match ("write", gfc_match_write, ST_WRITE)
1580 /* The gfc_match_assignment() above may have returned a MATCH_NO
1581 where the assignment was to a named constant. Check that
1582 special case here. */
1583 m = gfc_match_assignment ();
1586 gfc_error ("Cannot assign to a named constant at %C");
1587 gfc_free_expr (expr);
1588 gfc_undo_symbols ();
1589 gfc_current_locus = old_loc;
1593 /* All else has failed, so give up. See if any of the matchers has
1594 stored an error message of some sort. */
1595 if (gfc_error_check () == 0)
1596 gfc_error ("Unclassifiable statement in IF-clause at %C");
1598 gfc_free_expr (expr);
1603 gfc_error ("Syntax error in IF-clause at %C");
1606 gfc_free_expr (expr);
1610 /* At this point, we've matched the single IF and the action clause
1611 is in new_st. Rearrange things so that the IF statement appears
1614 p = gfc_get_code ();
1615 p->next = gfc_get_code ();
1617 p->next->loc = gfc_current_locus;
1622 gfc_clear_new_st ();
1624 new_st.op = EXEC_IF;
1633 /* Match an ELSE statement. */
1636 gfc_match_else (void)
1638 char name[GFC_MAX_SYMBOL_LEN + 1];
1640 if (gfc_match_eos () == MATCH_YES)
1643 if (gfc_match_name (name) != MATCH_YES
1644 || gfc_current_block () == NULL
1645 || gfc_match_eos () != MATCH_YES)
1647 gfc_error ("Unexpected junk after ELSE statement at %C");
1651 if (strcmp (name, gfc_current_block ()->name) != 0)
1653 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1654 name, gfc_current_block ()->name);
1662 /* Match an ELSE IF statement. */
1665 gfc_match_elseif (void)
1667 char name[GFC_MAX_SYMBOL_LEN + 1];
1671 m = gfc_match (" ( %e ) then", &expr);
1675 if (gfc_match_eos () == MATCH_YES)
1678 if (gfc_match_name (name) != MATCH_YES
1679 || gfc_current_block () == NULL
1680 || gfc_match_eos () != MATCH_YES)
1682 gfc_error ("Unexpected junk after ELSE IF statement at %C");
1686 if (strcmp (name, gfc_current_block ()->name) != 0)
1688 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1689 name, gfc_current_block ()->name);
1694 new_st.op = EXEC_IF;
1695 new_st.expr1 = expr;
1699 gfc_free_expr (expr);
1704 /* Free a gfc_iterator structure. */
1707 gfc_free_iterator (gfc_iterator *iter, int flag)
1713 gfc_free_expr (iter->var);
1714 gfc_free_expr (iter->start);
1715 gfc_free_expr (iter->end);
1716 gfc_free_expr (iter->step);
1723 /* Match a CRITICAL statement. */
1725 gfc_match_critical (void)
1727 gfc_st_label *label = NULL;
1729 if (gfc_match_label () == MATCH_ERROR)
1732 if (gfc_match (" critical") != MATCH_YES)
1735 if (gfc_match_st_label (&label) == MATCH_ERROR)
1738 if (gfc_match_eos () != MATCH_YES)
1740 gfc_syntax_error (ST_CRITICAL);
1744 if (gfc_pure (NULL))
1746 gfc_error ("Image control statement CRITICAL at %C in PURE procedure");
1750 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CRITICAL statement at %C")
1754 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
1756 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
1760 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
1762 gfc_error ("Nested CRITICAL block at %C");
1766 new_st.op = EXEC_CRITICAL;
1769 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1776 /* Match a BLOCK statement. */
1779 gfc_match_block (void)
1783 if (gfc_match_label () == MATCH_ERROR)
1786 if (gfc_match (" block") != MATCH_YES)
1789 /* For this to be a correct BLOCK statement, the line must end now. */
1790 m = gfc_match_eos ();
1791 if (m == MATCH_ERROR)
1800 /* Match a DO statement. */
1805 gfc_iterator iter, *ip;
1807 gfc_st_label *label;
1810 old_loc = gfc_current_locus;
1813 iter.var = iter.start = iter.end = iter.step = NULL;
1815 m = gfc_match_label ();
1816 if (m == MATCH_ERROR)
1819 if (gfc_match (" do") != MATCH_YES)
1822 m = gfc_match_st_label (&label);
1823 if (m == MATCH_ERROR)
1826 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1828 if (gfc_match_eos () == MATCH_YES)
1830 iter.end = gfc_get_logical_expr (gfc_default_logical_kind, NULL, true);
1831 new_st.op = EXEC_DO_WHILE;
1835 /* Match an optional comma, if no comma is found, a space is obligatory. */
1836 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1839 /* Check for balanced parens. */
1841 if (gfc_match_parens () == MATCH_ERROR)
1844 /* See if we have a DO WHILE. */
1845 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1847 new_st.op = EXEC_DO_WHILE;
1851 /* The abortive DO WHILE may have done something to the symbol
1852 table, so we start over. */
1853 gfc_undo_symbols ();
1854 gfc_current_locus = old_loc;
1856 gfc_match_label (); /* This won't error. */
1857 gfc_match (" do "); /* This will work. */
1859 gfc_match_st_label (&label); /* Can't error out. */
1860 gfc_match_char (','); /* Optional comma. */
1862 m = gfc_match_iterator (&iter, 0);
1865 if (m == MATCH_ERROR)
1868 iter.var->symtree->n.sym->attr.implied_index = 0;
1869 gfc_check_do_variable (iter.var->symtree);
1871 if (gfc_match_eos () != MATCH_YES)
1873 gfc_syntax_error (ST_DO);
1877 new_st.op = EXEC_DO;
1881 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1884 new_st.label1 = label;
1886 if (new_st.op == EXEC_DO_WHILE)
1887 new_st.expr1 = iter.end;
1890 new_st.ext.iterator = ip = gfc_get_iterator ();
1897 gfc_free_iterator (&iter, 0);
1903 /* Match an EXIT or CYCLE statement. */
1906 match_exit_cycle (gfc_statement st, gfc_exec_op op)
1908 gfc_state_data *p, *o;
1912 if (gfc_match_eos () == MATCH_YES)
1916 m = gfc_match ("% %s%t", &sym);
1917 if (m == MATCH_ERROR)
1921 gfc_syntax_error (st);
1925 if (sym->attr.flavor != FL_LABEL)
1927 gfc_error ("Name '%s' in %s statement at %C is not a loop name",
1928 sym->name, gfc_ascii_statement (st));
1933 /* Find the loop mentioned specified by the label (or lack of a label). */
1934 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
1935 if (p->state == COMP_DO && (sym == NULL || sym == p->sym))
1937 else if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
1939 else if (p->state == COMP_CRITICAL)
1941 gfc_error("%s statement at %C leaves CRITICAL construct",
1942 gfc_ascii_statement (st));
1949 gfc_error ("%s statement at %C is not within a loop",
1950 gfc_ascii_statement (st));
1952 gfc_error ("%s statement at %C is not within loop '%s'",
1953 gfc_ascii_statement (st), sym->name);
1960 gfc_error ("%s statement at %C leaving OpenMP structured block",
1961 gfc_ascii_statement (st));
1964 else if (st == ST_EXIT
1965 && p->previous != NULL
1966 && p->previous->state == COMP_OMP_STRUCTURED_BLOCK
1967 && (p->previous->head->op == EXEC_OMP_DO
1968 || p->previous->head->op == EXEC_OMP_PARALLEL_DO))
1970 gcc_assert (p->previous->head->next != NULL);
1971 gcc_assert (p->previous->head->next->op == EXEC_DO
1972 || p->previous->head->next->op == EXEC_DO_WHILE);
1973 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
1977 /* Save the first statement in the loop - needed by the backend. */
1978 new_st.ext.whichloop = p->head;
1986 /* Match the EXIT statement. */
1989 gfc_match_exit (void)
1991 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
1995 /* Match the CYCLE statement. */
1998 gfc_match_cycle (void)
2000 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
2004 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
2007 gfc_match_stopcode (gfc_statement st)
2014 if (gfc_match_eos () != MATCH_YES)
2016 m = gfc_match_init_expr (&e);
2017 if (m == MATCH_ERROR)
2022 if (gfc_match_eos () != MATCH_YES)
2026 if (gfc_pure (NULL))
2028 gfc_error ("%s statement not allowed in PURE procedure at %C",
2029 gfc_ascii_statement (st));
2033 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2035 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2041 if (!(e->ts.type == BT_CHARACTER || e->ts.type == BT_INTEGER))
2043 gfc_error ("STOP code at %L must be either INTEGER or CHARACTER type",
2050 gfc_error ("STOP code at %L must be scalar",
2055 if (e->ts.type == BT_CHARACTER
2056 && e->ts.kind != gfc_default_character_kind)
2058 gfc_error ("STOP code at %L must be default character KIND=%d",
2059 &e->where, (int) gfc_default_character_kind);
2063 if (e->ts.type == BT_INTEGER
2064 && e->ts.kind != gfc_default_integer_kind)
2066 gfc_error ("STOP code at %L must be default integer KIND=%d",
2067 &e->where, (int) gfc_default_integer_kind);
2075 new_st.op = EXEC_STOP;
2078 new_st.op = EXEC_ERROR_STOP;
2081 new_st.op = EXEC_PAUSE;
2088 new_st.ext.stop_code = -1;
2093 gfc_syntax_error (st);
2102 /* Match the (deprecated) PAUSE statement. */
2105 gfc_match_pause (void)
2109 m = gfc_match_stopcode (ST_PAUSE);
2112 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2121 /* Match the STOP statement. */
2124 gfc_match_stop (void)
2126 return gfc_match_stopcode (ST_STOP);
2130 /* Match the ERROR STOP statement. */
2133 gfc_match_error_stop (void)
2135 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2139 return gfc_match_stopcode (ST_ERROR_STOP);
2143 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2144 SYNC ALL [(sync-stat-list)]
2145 SYNC MEMORY [(sync-stat-list)]
2146 SYNC IMAGES (image-set [, sync-stat-list] )
2147 with sync-stat is int-expr or *. */
2150 sync_statement (gfc_statement st)
2153 gfc_expr *tmp, *imageset, *stat, *errmsg;
2154 bool saw_stat, saw_errmsg;
2156 tmp = imageset = stat = errmsg = NULL;
2157 saw_stat = saw_errmsg = false;
2159 if (gfc_pure (NULL))
2161 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2165 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2169 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2171 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2175 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2177 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2181 if (gfc_match_eos () == MATCH_YES)
2183 if (st == ST_SYNC_IMAGES)
2188 if (gfc_match_char ('(') != MATCH_YES)
2191 if (st == ST_SYNC_IMAGES)
2193 /* Denote '*' as imageset == NULL. */
2194 m = gfc_match_char ('*');
2195 if (m == MATCH_ERROR)
2199 if (gfc_match ("%e", &imageset) != MATCH_YES)
2202 m = gfc_match_char (',');
2203 if (m == MATCH_ERROR)
2207 m = gfc_match_char (')');
2216 m = gfc_match (" stat = %v", &tmp);
2217 if (m == MATCH_ERROR)
2223 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2229 if (gfc_match_char (',') == MATCH_YES)
2233 m = gfc_match (" errmsg = %v", &tmp);
2234 if (m == MATCH_ERROR)
2240 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2246 if (gfc_match_char (',') == MATCH_YES)
2250 gfc_gobble_whitespace ();
2252 if (gfc_peek_char () == ')')
2258 if (gfc_match (" )%t") != MATCH_YES)
2265 new_st.op = EXEC_SYNC_ALL;
2267 case ST_SYNC_IMAGES:
2268 new_st.op = EXEC_SYNC_IMAGES;
2270 case ST_SYNC_MEMORY:
2271 new_st.op = EXEC_SYNC_MEMORY;
2277 new_st.expr1 = imageset;
2278 new_st.expr2 = stat;
2279 new_st.expr3 = errmsg;
2284 gfc_syntax_error (st);
2287 gfc_free_expr (tmp);
2288 gfc_free_expr (imageset);
2289 gfc_free_expr (stat);
2290 gfc_free_expr (errmsg);
2296 /* Match SYNC ALL statement. */
2299 gfc_match_sync_all (void)
2301 return sync_statement (ST_SYNC_ALL);
2305 /* Match SYNC IMAGES statement. */
2308 gfc_match_sync_images (void)
2310 return sync_statement (ST_SYNC_IMAGES);
2314 /* Match SYNC MEMORY statement. */
2317 gfc_match_sync_memory (void)
2319 return sync_statement (ST_SYNC_MEMORY);
2323 /* Match a CONTINUE statement. */
2326 gfc_match_continue (void)
2328 if (gfc_match_eos () != MATCH_YES)
2330 gfc_syntax_error (ST_CONTINUE);
2334 new_st.op = EXEC_CONTINUE;
2339 /* Match the (deprecated) ASSIGN statement. */
2342 gfc_match_assign (void)
2345 gfc_st_label *label;
2347 if (gfc_match (" %l", &label) == MATCH_YES)
2349 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2351 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2353 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2358 expr->symtree->n.sym->attr.assign = 1;
2360 new_st.op = EXEC_LABEL_ASSIGN;
2361 new_st.label1 = label;
2362 new_st.expr1 = expr;
2370 /* Match the GO TO statement. As a computed GOTO statement is
2371 matched, it is transformed into an equivalent SELECT block. No
2372 tree is necessary, and the resulting jumps-to-jumps are
2373 specifically optimized away by the back end. */
2376 gfc_match_goto (void)
2378 gfc_code *head, *tail;
2381 gfc_st_label *label;
2385 if (gfc_match (" %l%t", &label) == MATCH_YES)
2387 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2390 new_st.op = EXEC_GOTO;
2391 new_st.label1 = label;
2395 /* The assigned GO TO statement. */
2397 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2399 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2404 new_st.op = EXEC_GOTO;
2405 new_st.expr1 = expr;
2407 if (gfc_match_eos () == MATCH_YES)
2410 /* Match label list. */
2411 gfc_match_char (',');
2412 if (gfc_match_char ('(') != MATCH_YES)
2414 gfc_syntax_error (ST_GOTO);
2421 m = gfc_match_st_label (&label);
2425 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2429 head = tail = gfc_get_code ();
2432 tail->block = gfc_get_code ();
2436 tail->label1 = label;
2437 tail->op = EXEC_GOTO;
2439 while (gfc_match_char (',') == MATCH_YES);
2441 if (gfc_match (")%t") != MATCH_YES)
2446 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2449 new_st.block = head;
2454 /* Last chance is a computed GO TO statement. */
2455 if (gfc_match_char ('(') != MATCH_YES)
2457 gfc_syntax_error (ST_GOTO);
2466 m = gfc_match_st_label (&label);
2470 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2474 head = tail = gfc_get_code ();
2477 tail->block = gfc_get_code ();
2481 cp = gfc_get_case ();
2482 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2485 tail->op = EXEC_SELECT;
2486 tail->ext.case_list = cp;
2488 tail->next = gfc_get_code ();
2489 tail->next->op = EXEC_GOTO;
2490 tail->next->label1 = label;
2492 while (gfc_match_char (',') == MATCH_YES);
2494 if (gfc_match_char (')') != MATCH_YES)
2499 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2503 /* Get the rest of the statement. */
2504 gfc_match_char (',');
2506 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2509 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2510 "at %C") == FAILURE)
2513 /* At this point, a computed GOTO has been fully matched and an
2514 equivalent SELECT statement constructed. */
2516 new_st.op = EXEC_SELECT;
2517 new_st.expr1 = NULL;
2519 /* Hack: For a "real" SELECT, the expression is in expr. We put
2520 it in expr2 so we can distinguish then and produce the correct
2522 new_st.expr2 = expr;
2523 new_st.block = head;
2527 gfc_syntax_error (ST_GOTO);
2529 gfc_free_statements (head);
2534 /* Frees a list of gfc_alloc structures. */
2537 gfc_free_alloc_list (gfc_alloc *p)
2544 gfc_free_expr (p->expr);
2550 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2551 an accessible derived type. */
2554 match_derived_type_spec (gfc_typespec *ts)
2557 gfc_symbol *derived;
2559 old_locus = gfc_current_locus;
2561 if (gfc_match_symbol (&derived, 1) == MATCH_YES)
2563 if (derived->attr.flavor == FL_DERIVED)
2565 ts->type = BT_DERIVED;
2566 ts->u.derived = derived;
2571 /* Enforce F03:C476. */
2572 gfc_error ("'%s' at %L is not an accessible derived type",
2573 derived->name, &gfc_current_locus);
2578 gfc_current_locus = old_locus;
2583 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2584 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2585 It only includes the intrinsic types from the Fortran 2003 standard
2586 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2587 the implicit_flag is not needed, so it was removed. Derived types are
2588 identified by their name alone. */
2591 match_type_spec (gfc_typespec *ts)
2597 old_locus = gfc_current_locus;
2599 if (gfc_match ("integer") == MATCH_YES)
2601 ts->type = BT_INTEGER;
2602 ts->kind = gfc_default_integer_kind;
2606 if (gfc_match ("real") == MATCH_YES)
2609 ts->kind = gfc_default_real_kind;
2613 if (gfc_match ("double precision") == MATCH_YES)
2616 ts->kind = gfc_default_double_kind;
2620 if (gfc_match ("complex") == MATCH_YES)
2622 ts->type = BT_COMPLEX;
2623 ts->kind = gfc_default_complex_kind;
2627 if (gfc_match ("character") == MATCH_YES)
2629 ts->type = BT_CHARACTER;
2633 if (gfc_match ("logical") == MATCH_YES)
2635 ts->type = BT_LOGICAL;
2636 ts->kind = gfc_default_logical_kind;
2640 m = match_derived_type_spec (ts);
2643 old_locus = gfc_current_locus;
2644 if (gfc_match (" :: ") != MATCH_YES)
2646 gfc_current_locus = old_locus;
2647 /* Enfore F03:C401. */
2648 if (ts->u.derived->attr.abstract)
2650 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2651 ts->u.derived->name, &old_locus);
2656 else if (m == MATCH_ERROR && gfc_match (" :: ") == MATCH_YES)
2659 /* If a type is not matched, simply return MATCH_NO. */
2660 gfc_current_locus = old_locus;
2665 gfc_gobble_whitespace ();
2666 if (gfc_peek_ascii_char () == '*')
2668 gfc_error ("Invalid type-spec at %C");
2672 m = gfc_match_kind_spec (ts, false);
2675 m = MATCH_YES; /* No kind specifier found. */
2681 m = gfc_match_char_spec (ts);
2684 m = MATCH_YES; /* No kind specifier found. */
2690 /* Match an ALLOCATE statement. */
2693 gfc_match_allocate (void)
2695 gfc_alloc *head, *tail;
2696 gfc_expr *stat, *errmsg, *tmp, *source;
2701 bool saw_stat, saw_errmsg, saw_source, b1, b2, b3;
2704 stat = errmsg = source = tmp = NULL;
2705 saw_stat = saw_errmsg = saw_source = false;
2707 if (gfc_match_char ('(') != MATCH_YES)
2710 /* Match an optional type-spec. */
2711 old_locus = gfc_current_locus;
2712 m = match_type_spec (&ts);
2713 if (m == MATCH_ERROR)
2715 else if (m == MATCH_NO)
2716 ts.type = BT_UNKNOWN;
2719 if (gfc_match (" :: ") == MATCH_YES)
2721 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2722 "ALLOCATE at %L", &old_locus) == FAILURE)
2727 ts.type = BT_UNKNOWN;
2728 gfc_current_locus = old_locus;
2735 head = tail = gfc_get_alloc ();
2738 tail->next = gfc_get_alloc ();
2742 m = gfc_match_variable (&tail->expr, 0);
2745 if (m == MATCH_ERROR)
2748 if (gfc_check_do_variable (tail->expr->symtree))
2751 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2753 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2757 /* The ALLOCATE statement had an optional typespec. Check the
2759 if (ts.type != BT_UNKNOWN)
2761 /* Enforce F03:C624. */
2762 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2764 gfc_error ("Type of entity at %L is type incompatible with "
2765 "typespec", &tail->expr->where);
2769 /* Enforce F03:C627. */
2770 if (ts.kind != tail->expr->ts.kind)
2772 gfc_error ("Kind type parameter for entity at %L differs from "
2773 "the kind type parameter of the typespec",
2774 &tail->expr->where);
2779 if (tail->expr->ts.type == BT_DERIVED)
2780 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2782 /* FIXME: disable the checking on derived types and arrays. */
2783 sym = tail->expr->symtree->n.sym;
2784 b1 = !(tail->expr->ref
2785 && (tail->expr->ref->type == REF_COMPONENT
2786 || tail->expr->ref->type == REF_ARRAY));
2787 if (sym && sym->ts.type == BT_CLASS)
2788 b2 = !(CLASS_DATA (sym)->attr.allocatable
2789 || CLASS_DATA (sym)->attr.pointer);
2791 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2792 || sym->attr.proc_pointer);
2793 b3 = sym && sym->ns && sym->ns->proc_name
2794 && (sym->ns->proc_name->attr.allocatable
2795 || sym->ns->proc_name->attr.pointer
2796 || sym->ns->proc_name->attr.proc_pointer);
2797 if (b1 && b2 && !b3)
2799 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2800 "or an allocatable variable");
2804 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2806 gfc_error ("Shape specification for allocatable scalar at %C");
2810 if (gfc_match_char (',') != MATCH_YES)
2815 m = gfc_match (" stat = %v", &tmp);
2816 if (m == MATCH_ERROR)
2823 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2830 if (gfc_check_do_variable (stat->symtree))
2833 if (gfc_match_char (',') == MATCH_YES)
2834 goto alloc_opt_list;
2837 m = gfc_match (" errmsg = %v", &tmp);
2838 if (m == MATCH_ERROR)
2842 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
2843 &tmp->where) == FAILURE)
2849 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2856 if (gfc_match_char (',') == MATCH_YES)
2857 goto alloc_opt_list;
2860 m = gfc_match (" source = %e", &tmp);
2861 if (m == MATCH_ERROR)
2865 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
2866 &tmp->where) == FAILURE)
2872 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
2876 /* The next 2 conditionals check C631. */
2877 if (ts.type != BT_UNKNOWN)
2879 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
2880 &tmp->where, &old_locus);
2886 gfc_error ("SOURCE tag at %L requires only a single entity in "
2887 "the allocation-list", &tmp->where);
2894 if (gfc_match_char (',') == MATCH_YES)
2895 goto alloc_opt_list;
2898 gfc_gobble_whitespace ();
2900 if (gfc_peek_char () == ')')
2905 if (gfc_match (" )%t") != MATCH_YES)
2908 new_st.op = EXEC_ALLOCATE;
2909 new_st.expr1 = stat;
2910 new_st.expr2 = errmsg;
2911 new_st.expr3 = source;
2912 new_st.ext.alloc.list = head;
2913 new_st.ext.alloc.ts = ts;
2918 gfc_syntax_error (ST_ALLOCATE);
2921 gfc_free_expr (errmsg);
2922 gfc_free_expr (source);
2923 gfc_free_expr (stat);
2924 gfc_free_expr (tmp);
2925 gfc_free_alloc_list (head);
2930 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
2931 a set of pointer assignments to intrinsic NULL(). */
2934 gfc_match_nullify (void)
2942 if (gfc_match_char ('(') != MATCH_YES)
2947 m = gfc_match_variable (&p, 0);
2948 if (m == MATCH_ERROR)
2953 if (gfc_check_do_variable (p->symtree))
2956 if (gfc_pure (NULL) && gfc_impure_variable (p->symtree->n.sym))
2958 gfc_error ("Illegal variable in NULLIFY at %C for a PURE procedure");
2962 /* build ' => NULL() '. */
2963 e = gfc_get_null_expr (&gfc_current_locus);
2965 /* Chain to list. */
2970 tail->next = gfc_get_code ();
2974 tail->op = EXEC_POINTER_ASSIGN;
2978 if (gfc_match (" )%t") == MATCH_YES)
2980 if (gfc_match_char (',') != MATCH_YES)
2987 gfc_syntax_error (ST_NULLIFY);
2990 gfc_free_statements (new_st.next);
2992 gfc_free_expr (new_st.expr1);
2993 new_st.expr1 = NULL;
2994 gfc_free_expr (new_st.expr2);
2995 new_st.expr2 = NULL;
3000 /* Match a DEALLOCATE statement. */
3003 gfc_match_deallocate (void)
3005 gfc_alloc *head, *tail;
3006 gfc_expr *stat, *errmsg, *tmp;
3009 bool saw_stat, saw_errmsg, b1, b2;
3012 stat = errmsg = tmp = NULL;
3013 saw_stat = saw_errmsg = false;
3015 if (gfc_match_char ('(') != MATCH_YES)
3021 head = tail = gfc_get_alloc ();
3024 tail->next = gfc_get_alloc ();
3028 m = gfc_match_variable (&tail->expr, 0);
3029 if (m == MATCH_ERROR)
3034 if (gfc_check_do_variable (tail->expr->symtree))
3037 sym = tail->expr->symtree->n.sym;
3039 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3041 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3045 /* FIXME: disable the checking on derived types. */
3046 b1 = !(tail->expr->ref
3047 && (tail->expr->ref->type == REF_COMPONENT
3048 || tail->expr->ref->type == REF_ARRAY));
3049 if (sym && sym->ts.type == BT_CLASS)
3050 b2 = !(CLASS_DATA (sym)->attr.allocatable
3051 || CLASS_DATA (sym)->attr.pointer);
3053 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3054 || sym->attr.proc_pointer);
3057 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3058 "or an allocatable variable");
3062 if (gfc_match_char (',') != MATCH_YES)
3067 m = gfc_match (" stat = %v", &tmp);
3068 if (m == MATCH_ERROR)
3074 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3075 gfc_free_expr (tmp);
3082 if (gfc_check_do_variable (stat->symtree))
3085 if (gfc_match_char (',') == MATCH_YES)
3086 goto dealloc_opt_list;
3089 m = gfc_match (" errmsg = %v", &tmp);
3090 if (m == MATCH_ERROR)
3094 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3095 &tmp->where) == FAILURE)
3100 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3101 gfc_free_expr (tmp);
3108 if (gfc_match_char (',') == MATCH_YES)
3109 goto dealloc_opt_list;
3112 gfc_gobble_whitespace ();
3114 if (gfc_peek_char () == ')')
3118 if (gfc_match (" )%t") != MATCH_YES)
3121 new_st.op = EXEC_DEALLOCATE;
3122 new_st.expr1 = stat;
3123 new_st.expr2 = errmsg;
3124 new_st.ext.alloc.list = head;
3129 gfc_syntax_error (ST_DEALLOCATE);
3132 gfc_free_expr (errmsg);
3133 gfc_free_expr (stat);
3134 gfc_free_alloc_list (head);
3139 /* Match a RETURN statement. */
3142 gfc_match_return (void)
3146 gfc_compile_state s;
3150 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3152 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3156 if (gfc_match_eos () == MATCH_YES)
3159 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3161 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3166 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3167 "at %C") == FAILURE)
3170 if (gfc_current_form == FORM_FREE)
3172 /* The following are valid, so we can't require a blank after the
3176 char c = gfc_peek_ascii_char ();
3177 if (ISALPHA (c) || ISDIGIT (c))
3181 m = gfc_match (" %e%t", &e);
3184 if (m == MATCH_ERROR)
3187 gfc_syntax_error (ST_RETURN);
3194 gfc_enclosing_unit (&s);
3195 if (s == COMP_PROGRAM
3196 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3197 "main program at %C") == FAILURE)
3200 new_st.op = EXEC_RETURN;
3207 /* Match the call of a type-bound procedure, if CALL%var has already been
3208 matched and var found to be a derived-type variable. */
3211 match_typebound_call (gfc_symtree* varst)
3216 base = gfc_get_expr ();
3217 base->expr_type = EXPR_VARIABLE;
3218 base->symtree = varst;
3219 base->where = gfc_current_locus;
3220 gfc_set_sym_referenced (varst->n.sym);
3222 m = gfc_match_varspec (base, 0, true, true);
3224 gfc_error ("Expected component reference at %C");
3228 if (gfc_match_eos () != MATCH_YES)
3230 gfc_error ("Junk after CALL at %C");
3234 if (base->expr_type == EXPR_COMPCALL)
3235 new_st.op = EXEC_COMPCALL;
3236 else if (base->expr_type == EXPR_PPC)
3237 new_st.op = EXEC_CALL_PPC;
3240 gfc_error ("Expected type-bound procedure or procedure pointer component "
3244 new_st.expr1 = base;
3250 /* Match a CALL statement. The tricky part here are possible
3251 alternate return specifiers. We handle these by having all
3252 "subroutines" actually return an integer via a register that gives
3253 the return number. If the call specifies alternate returns, we
3254 generate code for a SELECT statement whose case clauses contain
3255 GOTOs to the various labels. */
3258 gfc_match_call (void)
3260 char name[GFC_MAX_SYMBOL_LEN + 1];
3261 gfc_actual_arglist *a, *arglist;
3271 m = gfc_match ("% %n", name);
3277 if (gfc_get_ha_sym_tree (name, &st))
3282 /* If this is a variable of derived-type, it probably starts a type-bound
3284 if ((sym->attr.flavor != FL_PROCEDURE
3285 || gfc_is_function_return_value (sym, gfc_current_ns))
3286 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3287 return match_typebound_call (st);
3289 /* If it does not seem to be callable (include functions so that the
3290 right association is made. They are thrown out in resolution.)
3292 if (!sym->attr.generic
3293 && !sym->attr.subroutine
3294 && !sym->attr.function)
3296 if (!(sym->attr.external && !sym->attr.referenced))
3298 /* ...create a symbol in this scope... */
3299 if (sym->ns != gfc_current_ns
3300 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3303 if (sym != st->n.sym)
3307 /* ...and then to try to make the symbol into a subroutine. */
3308 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3312 gfc_set_sym_referenced (sym);
3314 if (gfc_match_eos () != MATCH_YES)
3316 m = gfc_match_actual_arglist (1, &arglist);
3319 if (m == MATCH_ERROR)
3322 if (gfc_match_eos () != MATCH_YES)
3326 /* If any alternate return labels were found, construct a SELECT
3327 statement that will jump to the right place. */
3330 for (a = arglist; a; a = a->next)
3331 if (a->expr == NULL)
3336 gfc_symtree *select_st;
3337 gfc_symbol *select_sym;
3338 char name[GFC_MAX_SYMBOL_LEN + 1];
3340 new_st.next = c = gfc_get_code ();
3341 c->op = EXEC_SELECT;
3342 sprintf (name, "_result_%s", sym->name);
3343 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3345 select_sym = select_st->n.sym;
3346 select_sym->ts.type = BT_INTEGER;
3347 select_sym->ts.kind = gfc_default_integer_kind;
3348 gfc_set_sym_referenced (select_sym);
3349 c->expr1 = gfc_get_expr ();
3350 c->expr1->expr_type = EXPR_VARIABLE;
3351 c->expr1->symtree = select_st;
3352 c->expr1->ts = select_sym->ts;
3353 c->expr1->where = gfc_current_locus;
3356 for (a = arglist; a; a = a->next)
3358 if (a->expr != NULL)
3361 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3366 c->block = gfc_get_code ();
3368 c->op = EXEC_SELECT;
3370 new_case = gfc_get_case ();
3371 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3372 new_case->low = new_case->high;
3373 c->ext.case_list = new_case;
3375 c->next = gfc_get_code ();
3376 c->next->op = EXEC_GOTO;
3377 c->next->label1 = a->label;
3381 new_st.op = EXEC_CALL;
3382 new_st.symtree = st;
3383 new_st.ext.actual = arglist;
3388 gfc_syntax_error (ST_CALL);
3391 gfc_free_actual_arglist (arglist);
3396 /* Given a name, return a pointer to the common head structure,
3397 creating it if it does not exist. If FROM_MODULE is nonzero, we
3398 mangle the name so that it doesn't interfere with commons defined
3399 in the using namespace.
3400 TODO: Add to global symbol tree. */
3403 gfc_get_common (const char *name, int from_module)
3406 static int serial = 0;
3407 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3411 /* A use associated common block is only needed to correctly layout
3412 the variables it contains. */
3413 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3414 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3418 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3421 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3424 if (st->n.common == NULL)
3426 st->n.common = gfc_get_common_head ();
3427 st->n.common->where = gfc_current_locus;
3428 strcpy (st->n.common->name, name);
3431 return st->n.common;
3435 /* Match a common block name. */
3437 match match_common_name (char *name)
3441 if (gfc_match_char ('/') == MATCH_NO)
3447 if (gfc_match_char ('/') == MATCH_YES)
3453 m = gfc_match_name (name);
3455 if (m == MATCH_ERROR)
3457 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3460 gfc_error ("Syntax error in common block name at %C");
3465 /* Match a COMMON statement. */
3468 gfc_match_common (void)
3470 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3471 char name[GFC_MAX_SYMBOL_LEN + 1];
3478 old_blank_common = gfc_current_ns->blank_common.head;
3479 if (old_blank_common)
3481 while (old_blank_common->common_next)
3482 old_blank_common = old_blank_common->common_next;
3489 m = match_common_name (name);
3490 if (m == MATCH_ERROR)
3493 gsym = gfc_get_gsymbol (name);
3494 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3496 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3497 "is not COMMON", name);
3501 if (gsym->type == GSYM_UNKNOWN)
3503 gsym->type = GSYM_COMMON;
3504 gsym->where = gfc_current_locus;
3510 if (name[0] == '\0')
3512 t = &gfc_current_ns->blank_common;
3513 if (t->head == NULL)
3514 t->where = gfc_current_locus;
3518 t = gfc_get_common (name, 0);
3527 while (tail->common_next)
3528 tail = tail->common_next;
3531 /* Grab the list of symbols. */
3534 m = gfc_match_symbol (&sym, 0);
3535 if (m == MATCH_ERROR)
3540 /* Store a ref to the common block for error checking. */
3541 sym->common_block = t;
3543 /* See if we know the current common block is bind(c), and if
3544 so, then see if we can check if the symbol is (which it'll
3545 need to be). This can happen if the bind(c) attr stmt was
3546 applied to the common block, and the variable(s) already
3547 defined, before declaring the common block. */
3548 if (t->is_bind_c == 1)
3550 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3552 /* If we find an error, just print it and continue,
3553 cause it's just semantic, and we can see if there
3555 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3556 "at %C must be declared with a C "
3557 "interoperable kind since common block "
3559 sym->name, &(sym->declared_at), t->name,
3563 if (sym->attr.is_bind_c == 1)
3564 gfc_error_now ("Variable '%s' in common block "
3565 "'%s' at %C can not be bind(c) since "
3566 "it is not global", sym->name, t->name);
3569 if (sym->attr.in_common)
3571 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3576 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3577 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3579 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3580 "can only be COMMON in "
3581 "BLOCK DATA", sym->name)
3586 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3590 tail->common_next = sym;
3596 /* Deal with an optional array specification after the
3598 m = gfc_match_array_spec (&as, true, true);
3599 if (m == MATCH_ERROR)
3604 if (as->type != AS_EXPLICIT)
3606 gfc_error ("Array specification for symbol '%s' in COMMON "
3607 "at %C must be explicit", sym->name);
3611 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3614 if (sym->attr.pointer)
3616 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3617 "POINTER array", sym->name);
3626 sym->common_head = t;
3628 /* Check to see if the symbol is already in an equivalence group.
3629 If it is, set the other members as being in common. */
3630 if (sym->attr.in_equivalence)
3632 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3634 for (e2 = e1; e2; e2 = e2->eq)
3635 if (e2->expr->symtree->n.sym == sym)
3642 for (e2 = e1; e2; e2 = e2->eq)
3644 other = e2->expr->symtree->n.sym;
3645 if (other->common_head
3646 && other->common_head != sym->common_head)
3648 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3649 "%C is being indirectly equivalenced to "
3650 "another COMMON block '%s'",
3651 sym->name, sym->common_head->name,
3652 other->common_head->name);
3655 other->attr.in_common = 1;
3656 other->common_head = t;
3662 gfc_gobble_whitespace ();
3663 if (gfc_match_eos () == MATCH_YES)
3665 if (gfc_peek_ascii_char () == '/')
3667 if (gfc_match_char (',') != MATCH_YES)
3669 gfc_gobble_whitespace ();
3670 if (gfc_peek_ascii_char () == '/')
3679 gfc_syntax_error (ST_COMMON);
3682 if (old_blank_common)
3683 old_blank_common->common_next = NULL;
3685 gfc_current_ns->blank_common.head = NULL;
3686 gfc_free_array_spec (as);
3691 /* Match a BLOCK DATA program unit. */
3694 gfc_match_block_data (void)
3696 char name[GFC_MAX_SYMBOL_LEN + 1];
3700 if (gfc_match_eos () == MATCH_YES)
3702 gfc_new_block = NULL;
3706 m = gfc_match ("% %n%t", name);
3710 if (gfc_get_symbol (name, NULL, &sym))
3713 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3716 gfc_new_block = sym;
3722 /* Free a namelist structure. */
3725 gfc_free_namelist (gfc_namelist *name)
3729 for (; name; name = n)
3737 /* Match a NAMELIST statement. */
3740 gfc_match_namelist (void)
3742 gfc_symbol *group_name, *sym;
3746 m = gfc_match (" / %s /", &group_name);
3749 if (m == MATCH_ERROR)
3754 if (group_name->ts.type != BT_UNKNOWN)
3756 gfc_error ("Namelist group name '%s' at %C already has a basic "
3757 "type of %s", group_name->name,
3758 gfc_typename (&group_name->ts));
3762 if (group_name->attr.flavor == FL_NAMELIST
3763 && group_name->attr.use_assoc
3764 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3765 "at %C already is USE associated and can"
3766 "not be respecified.", group_name->name)
3770 if (group_name->attr.flavor != FL_NAMELIST
3771 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3772 group_name->name, NULL) == FAILURE)
3777 m = gfc_match_symbol (&sym, 1);
3780 if (m == MATCH_ERROR)
3783 if (sym->attr.in_namelist == 0
3784 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
3787 /* Use gfc_error_check here, rather than goto error, so that
3788 these are the only errors for the next two lines. */
3789 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
3791 gfc_error ("Assumed size array '%s' in namelist '%s' at "
3792 "%C is not allowed", sym->name, group_name->name);
3796 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
3798 gfc_error ("Assumed character length '%s' in namelist '%s' at "
3799 "%C is not allowed", sym->name, group_name->name);
3803 nl = gfc_get_namelist ();
3807 if (group_name->namelist == NULL)
3808 group_name->namelist = group_name->namelist_tail = nl;
3811 group_name->namelist_tail->next = nl;
3812 group_name->namelist_tail = nl;
3815 if (gfc_match_eos () == MATCH_YES)
3818 m = gfc_match_char (',');
3820 if (gfc_match_char ('/') == MATCH_YES)
3822 m2 = gfc_match (" %s /", &group_name);
3823 if (m2 == MATCH_YES)
3825 if (m2 == MATCH_ERROR)
3839 gfc_syntax_error (ST_NAMELIST);
3846 /* Match a MODULE statement. */
3849 gfc_match_module (void)
3853 m = gfc_match (" %s%t", &gfc_new_block);
3857 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
3858 gfc_new_block->name, NULL) == FAILURE)
3865 /* Free equivalence sets and lists. Recursively is the easiest way to
3869 gfc_free_equiv (gfc_equiv *eq)
3874 gfc_free_equiv (eq->eq);
3875 gfc_free_equiv (eq->next);
3876 gfc_free_expr (eq->expr);
3881 /* Match an EQUIVALENCE statement. */
3884 gfc_match_equivalence (void)
3886 gfc_equiv *eq, *set, *tail;
3890 gfc_common_head *common_head = NULL;
3898 eq = gfc_get_equiv ();
3902 eq->next = gfc_current_ns->equiv;
3903 gfc_current_ns->equiv = eq;
3905 if (gfc_match_char ('(') != MATCH_YES)
3909 common_flag = FALSE;
3914 m = gfc_match_equiv_variable (&set->expr);
3915 if (m == MATCH_ERROR)
3920 /* count the number of objects. */
3923 if (gfc_match_char ('%') == MATCH_YES)
3925 gfc_error ("Derived type component %C is not a "
3926 "permitted EQUIVALENCE member");
3930 for (ref = set->expr->ref; ref; ref = ref->next)
3931 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
3933 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
3934 "be an array section");
3938 sym = set->expr->symtree->n.sym;
3940 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
3943 if (sym->attr.in_common)
3946 common_head = sym->common_head;
3949 if (gfc_match_char (')') == MATCH_YES)
3952 if (gfc_match_char (',') != MATCH_YES)
3955 set->eq = gfc_get_equiv ();
3961 gfc_error ("EQUIVALENCE at %C requires two or more objects");
3965 /* If one of the members of an equivalence is in common, then
3966 mark them all as being in common. Before doing this, check
3967 that members of the equivalence group are not in different
3970 for (set = eq; set; set = set->eq)
3972 sym = set->expr->symtree->n.sym;
3973 if (sym->common_head && sym->common_head != common_head)
3975 gfc_error ("Attempt to indirectly overlap COMMON "
3976 "blocks %s and %s by EQUIVALENCE at %C",
3977 sym->common_head->name, common_head->name);
3980 sym->attr.in_common = 1;
3981 sym->common_head = common_head;
3984 if (gfc_match_eos () == MATCH_YES)
3986 if (gfc_match_char (',') != MATCH_YES)
3988 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
3996 gfc_syntax_error (ST_EQUIVALENCE);
4002 gfc_free_equiv (gfc_current_ns->equiv);
4003 gfc_current_ns->equiv = eq;
4009 /* Check that a statement function is not recursive. This is done by looking
4010 for the statement function symbol(sym) by looking recursively through its
4011 expression(e). If a reference to sym is found, true is returned.
4012 12.5.4 requires that any variable of function that is implicitly typed
4013 shall have that type confirmed by any subsequent type declaration. The
4014 implicit typing is conveniently done here. */
4016 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4019 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4025 switch (e->expr_type)
4028 if (e->symtree == NULL)
4031 /* Check the name before testing for nested recursion! */
4032 if (sym->name == e->symtree->n.sym->name)
4035 /* Catch recursion via other statement functions. */
4036 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4037 && e->symtree->n.sym->value
4038 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4041 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4042 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4047 if (e->symtree && sym->name == e->symtree->n.sym->name)
4050 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4051 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4063 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4065 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4069 /* Match a statement function declaration. It is so easy to match
4070 non-statement function statements with a MATCH_ERROR as opposed to
4071 MATCH_NO that we suppress error message in most cases. */
4074 gfc_match_st_function (void)
4076 gfc_error_buf old_error;
4081 m = gfc_match_symbol (&sym, 0);
4085 gfc_push_error (&old_error);
4087 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4088 sym->name, NULL) == FAILURE)
4091 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4094 m = gfc_match (" = %e%t", &expr);
4098 gfc_free_error (&old_error);
4099 if (m == MATCH_ERROR)
4102 if (recursive_stmt_fcn (expr, sym))
4104 gfc_error ("Statement function at %L is recursive", &expr->where);
4110 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4111 "Statement function at %C") == FAILURE)
4117 gfc_pop_error (&old_error);
4122 /***************** SELECT CASE subroutines ******************/
4124 /* Free a single case structure. */
4127 free_case (gfc_case *p)
4129 if (p->low == p->high)
4131 gfc_free_expr (p->low);
4132 gfc_free_expr (p->high);
4137 /* Free a list of case structures. */
4140 gfc_free_case_list (gfc_case *p)
4152 /* Match a single case selector. */
4155 match_case_selector (gfc_case **cp)
4160 c = gfc_get_case ();
4161 c->where = gfc_current_locus;
4163 if (gfc_match_char (':') == MATCH_YES)
4165 m = gfc_match_init_expr (&c->high);
4168 if (m == MATCH_ERROR)
4173 m = gfc_match_init_expr (&c->low);
4174 if (m == MATCH_ERROR)
4179 /* If we're not looking at a ':' now, make a range out of a single
4180 target. Else get the upper bound for the case range. */
4181 if (gfc_match_char (':') != MATCH_YES)
4185 m = gfc_match_init_expr (&c->high);
4186 if (m == MATCH_ERROR)
4188 /* MATCH_NO is fine. It's OK if nothing is there! */
4196 gfc_error ("Expected initialization expression in CASE at %C");
4204 /* Match the end of a case statement. */
4207 match_case_eos (void)
4209 char name[GFC_MAX_SYMBOL_LEN + 1];
4212 if (gfc_match_eos () == MATCH_YES)
4215 /* If the case construct doesn't have a case-construct-name, we
4216 should have matched the EOS. */
4217 if (!gfc_current_block ())
4220 gfc_gobble_whitespace ();
4222 m = gfc_match_name (name);
4226 if (strcmp (name, gfc_current_block ()->name) != 0)
4228 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4229 gfc_current_block ()->name);
4233 return gfc_match_eos ();
4237 /* Match a SELECT statement. */
4240 gfc_match_select (void)
4245 m = gfc_match_label ();
4246 if (m == MATCH_ERROR)
4249 m = gfc_match (" select case ( %e )%t", &expr);
4253 new_st.op = EXEC_SELECT;
4254 new_st.expr1 = expr;
4260 /* Push the current selector onto the SELECT TYPE stack. */
4263 select_type_push (gfc_symbol *sel)
4265 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4266 top->selector = sel;
4268 top->prev = select_type_stack;
4270 select_type_stack = top;
4274 /* Set the temporary for the current SELECT TYPE selector. */
4277 select_type_set_tmp (gfc_typespec *ts)
4279 char name[GFC_MAX_SYMBOL_LEN];
4282 if (!gfc_type_is_extensible (ts->u.derived))
4285 if (ts->type == BT_CLASS)
4286 sprintf (name, "tmp$class$%s", ts->u.derived->name);
4288 sprintf (name, "tmp$type$%s", ts->u.derived->name);
4289 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4290 gfc_add_type (tmp->n.sym, ts, NULL);
4291 gfc_set_sym_referenced (tmp->n.sym);
4292 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4293 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4294 if (ts->type == BT_CLASS)
4296 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4297 &tmp->n.sym->as, false);
4298 tmp->n.sym->attr.class_ok = 1;
4301 select_type_stack->tmp = tmp;
4305 /* Match a SELECT TYPE statement. */
4308 gfc_match_select_type (void)
4310 gfc_expr *expr1, *expr2 = NULL;
4312 char name[GFC_MAX_SYMBOL_LEN];
4314 m = gfc_match_label ();
4315 if (m == MATCH_ERROR)
4318 m = gfc_match (" select type ( ");
4322 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4324 m = gfc_match (" %n => %e", name, &expr2);
4327 expr1 = gfc_get_expr();
4328 expr1->expr_type = EXPR_VARIABLE;
4329 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4334 if (expr2->ts.type == BT_UNKNOWN)
4335 expr1->symtree->n.sym->attr.untyped = 1;
4337 expr1->symtree->n.sym->ts = expr2->ts;
4338 expr1->symtree->n.sym->attr.referenced = 1;
4339 expr1->symtree->n.sym->attr.class_ok = 1;
4343 m = gfc_match (" %e ", &expr1);
4348 m = gfc_match (" )%t");
4352 /* Check for F03:C811. */
4353 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4355 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4356 "use associate-name=>");
4361 new_st.op = EXEC_SELECT_TYPE;
4362 new_st.expr1 = expr1;
4363 new_st.expr2 = expr2;
4364 new_st.ext.ns = gfc_current_ns;
4366 select_type_push (expr1->symtree->n.sym);
4371 gfc_current_ns = gfc_current_ns->parent;
4376 /* Match a CASE statement. */
4379 gfc_match_case (void)
4381 gfc_case *c, *head, *tail;
4386 if (gfc_current_state () != COMP_SELECT)
4388 gfc_error ("Unexpected CASE statement at %C");
4392 if (gfc_match ("% default") == MATCH_YES)
4394 m = match_case_eos ();
4397 if (m == MATCH_ERROR)
4400 new_st.op = EXEC_SELECT;
4401 c = gfc_get_case ();
4402 c->where = gfc_current_locus;
4403 new_st.ext.case_list = c;
4407 if (gfc_match_char ('(') != MATCH_YES)
4412 if (match_case_selector (&c) == MATCH_ERROR)
4422 if (gfc_match_char (')') == MATCH_YES)
4424 if (gfc_match_char (',') != MATCH_YES)
4428 m = match_case_eos ();
4431 if (m == MATCH_ERROR)
4434 new_st.op = EXEC_SELECT;
4435 new_st.ext.case_list = head;
4440 gfc_error ("Syntax error in CASE specification at %C");
4443 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4448 /* Match a TYPE IS statement. */
4451 gfc_match_type_is (void)
4456 if (gfc_current_state () != COMP_SELECT_TYPE)
4458 gfc_error ("Unexpected TYPE IS statement at %C");
4462 if (gfc_match_char ('(') != MATCH_YES)
4465 c = gfc_get_case ();
4466 c->where = gfc_current_locus;
4468 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4469 match_type_spec here. */
4470 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4473 if (gfc_match_char (')') != MATCH_YES)
4476 m = match_case_eos ();
4479 if (m == MATCH_ERROR)
4482 new_st.op = EXEC_SELECT_TYPE;
4483 new_st.ext.case_list = c;
4485 /* Create temporary variable. */
4486 select_type_set_tmp (&c->ts);
4491 gfc_error ("Syntax error in TYPE IS specification at %C");
4495 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4500 /* Match a CLASS IS or CLASS DEFAULT statement. */
4503 gfc_match_class_is (void)
4508 if (gfc_current_state () != COMP_SELECT_TYPE)
4511 if (gfc_match ("% default") == MATCH_YES)
4513 m = match_case_eos ();
4516 if (m == MATCH_ERROR)
4519 new_st.op = EXEC_SELECT_TYPE;
4520 c = gfc_get_case ();
4521 c->where = gfc_current_locus;
4522 c->ts.type = BT_UNKNOWN;
4523 new_st.ext.case_list = c;
4527 m = gfc_match ("% is");
4530 if (m == MATCH_ERROR)
4533 if (gfc_match_char ('(') != MATCH_YES)
4536 c = gfc_get_case ();
4537 c->where = gfc_current_locus;
4539 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4542 if (c->ts.type == BT_DERIVED)
4543 c->ts.type = BT_CLASS;
4545 if (gfc_match_char (')') != MATCH_YES)
4548 m = match_case_eos ();
4551 if (m == MATCH_ERROR)
4554 new_st.op = EXEC_SELECT_TYPE;
4555 new_st.ext.case_list = c;
4557 /* Create temporary variable. */
4558 select_type_set_tmp (&c->ts);
4563 gfc_error ("Syntax error in CLASS IS specification at %C");
4567 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4572 /********************* WHERE subroutines ********************/
4574 /* Match the rest of a simple WHERE statement that follows an IF statement.
4578 match_simple_where (void)
4584 m = gfc_match (" ( %e )", &expr);
4588 m = gfc_match_assignment ();
4591 if (m == MATCH_ERROR)
4594 if (gfc_match_eos () != MATCH_YES)
4597 c = gfc_get_code ();
4601 c->next = gfc_get_code ();
4604 gfc_clear_new_st ();
4606 new_st.op = EXEC_WHERE;
4612 gfc_syntax_error (ST_WHERE);
4615 gfc_free_expr (expr);
4620 /* Match a WHERE statement. */
4623 gfc_match_where (gfc_statement *st)
4629 m0 = gfc_match_label ();
4630 if (m0 == MATCH_ERROR)
4633 m = gfc_match (" where ( %e )", &expr);
4637 if (gfc_match_eos () == MATCH_YES)
4639 *st = ST_WHERE_BLOCK;
4640 new_st.op = EXEC_WHERE;
4641 new_st.expr1 = expr;
4645 m = gfc_match_assignment ();
4647 gfc_syntax_error (ST_WHERE);
4651 gfc_free_expr (expr);
4655 /* We've got a simple WHERE statement. */
4657 c = gfc_get_code ();
4661 c->next = gfc_get_code ();
4664 gfc_clear_new_st ();
4666 new_st.op = EXEC_WHERE;
4673 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4674 new_st if successful. */
4677 gfc_match_elsewhere (void)
4679 char name[GFC_MAX_SYMBOL_LEN + 1];
4683 if (gfc_current_state () != COMP_WHERE)
4685 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4691 if (gfc_match_char ('(') == MATCH_YES)
4693 m = gfc_match_expr (&expr);
4696 if (m == MATCH_ERROR)
4699 if (gfc_match_char (')') != MATCH_YES)
4703 if (gfc_match_eos () != MATCH_YES)
4705 /* Only makes sense if we have a where-construct-name. */
4706 if (!gfc_current_block ())
4711 /* Better be a name at this point. */
4712 m = gfc_match_name (name);
4715 if (m == MATCH_ERROR)
4718 if (gfc_match_eos () != MATCH_YES)
4721 if (strcmp (name, gfc_current_block ()->name) != 0)
4723 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4724 name, gfc_current_block ()->name);
4729 new_st.op = EXEC_WHERE;
4730 new_st.expr1 = expr;
4734 gfc_syntax_error (ST_ELSEWHERE);
4737 gfc_free_expr (expr);
4742 /******************** FORALL subroutines ********************/
4744 /* Free a list of FORALL iterators. */
4747 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4749 gfc_forall_iterator *next;
4754 gfc_free_expr (iter->var);
4755 gfc_free_expr (iter->start);
4756 gfc_free_expr (iter->end);
4757 gfc_free_expr (iter->stride);
4764 /* Match an iterator as part of a FORALL statement. The format is:
4766 <var> = <start>:<end>[:<stride>]
4768 On MATCH_NO, the caller tests for the possibility that there is a
4769 scalar mask expression. */
4772 match_forall_iterator (gfc_forall_iterator **result)
4774 gfc_forall_iterator *iter;
4778 where = gfc_current_locus;
4779 iter = XCNEW (gfc_forall_iterator);
4781 m = gfc_match_expr (&iter->var);
4785 if (gfc_match_char ('=') != MATCH_YES
4786 || iter->var->expr_type != EXPR_VARIABLE)
4792 m = gfc_match_expr (&iter->start);
4796 if (gfc_match_char (':') != MATCH_YES)
4799 m = gfc_match_expr (&iter->end);
4802 if (m == MATCH_ERROR)
4805 if (gfc_match_char (':') == MATCH_NO)
4806 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4809 m = gfc_match_expr (&iter->stride);
4812 if (m == MATCH_ERROR)
4816 /* Mark the iteration variable's symbol as used as a FORALL index. */
4817 iter->var->symtree->n.sym->forall_index = true;
4823 gfc_error ("Syntax error in FORALL iterator at %C");
4828 gfc_current_locus = where;
4829 gfc_free_forall_iterator (iter);
4834 /* Match the header of a FORALL statement. */
4837 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
4839 gfc_forall_iterator *head, *tail, *new_iter;
4843 gfc_gobble_whitespace ();
4848 if (gfc_match_char ('(') != MATCH_YES)
4851 m = match_forall_iterator (&new_iter);
4852 if (m == MATCH_ERROR)
4857 head = tail = new_iter;
4861 if (gfc_match_char (',') != MATCH_YES)
4864 m = match_forall_iterator (&new_iter);
4865 if (m == MATCH_ERROR)
4870 tail->next = new_iter;
4875 /* Have to have a mask expression. */
4877 m = gfc_match_expr (&msk);
4880 if (m == MATCH_ERROR)
4886 if (gfc_match_char (')') == MATCH_NO)
4894 gfc_syntax_error (ST_FORALL);
4897 gfc_free_expr (msk);
4898 gfc_free_forall_iterator (head);
4903 /* Match the rest of a simple FORALL statement that follows an
4907 match_simple_forall (void)
4909 gfc_forall_iterator *head;
4918 m = match_forall_header (&head, &mask);
4925 m = gfc_match_assignment ();
4927 if (m == MATCH_ERROR)
4931 m = gfc_match_pointer_assignment ();
4932 if (m == MATCH_ERROR)
4938 c = gfc_get_code ();
4940 c->loc = gfc_current_locus;
4942 if (gfc_match_eos () != MATCH_YES)
4945 gfc_clear_new_st ();
4946 new_st.op = EXEC_FORALL;
4947 new_st.expr1 = mask;
4948 new_st.ext.forall_iterator = head;
4949 new_st.block = gfc_get_code ();
4951 new_st.block->op = EXEC_FORALL;
4952 new_st.block->next = c;
4957 gfc_syntax_error (ST_FORALL);
4960 gfc_free_forall_iterator (head);
4961 gfc_free_expr (mask);
4967 /* Match a FORALL statement. */
4970 gfc_match_forall (gfc_statement *st)
4972 gfc_forall_iterator *head;
4981 m0 = gfc_match_label ();
4982 if (m0 == MATCH_ERROR)
4985 m = gfc_match (" forall");
4989 m = match_forall_header (&head, &mask);
4990 if (m == MATCH_ERROR)
4995 if (gfc_match_eos () == MATCH_YES)
4997 *st = ST_FORALL_BLOCK;
4998 new_st.op = EXEC_FORALL;
4999 new_st.expr1 = mask;
5000 new_st.ext.forall_iterator = head;
5004 m = gfc_match_assignment ();
5005 if (m == MATCH_ERROR)
5009 m = gfc_match_pointer_assignment ();
5010 if (m == MATCH_ERROR)
5016 c = gfc_get_code ();
5018 c->loc = gfc_current_locus;
5020 gfc_clear_new_st ();
5021 new_st.op = EXEC_FORALL;
5022 new_st.expr1 = mask;
5023 new_st.ext.forall_iterator = head;
5024 new_st.block = gfc_get_code ();
5025 new_st.block->op = EXEC_FORALL;
5026 new_st.block->next = c;
5032 gfc_syntax_error (ST_FORALL);
5035 gfc_free_forall_iterator (head);
5036 gfc_free_expr (mask);
5037 gfc_free_statements (c);