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 an ASSOCIATE statement. */
1803 gfc_match_associate (void)
1805 if (gfc_match_label () == MATCH_ERROR)
1808 if (gfc_match (" associate") != MATCH_YES)
1811 /* Match the association list. */
1812 if (gfc_match_char ('(') != MATCH_YES)
1814 gfc_error ("Expected association list at %C");
1817 new_st.ext.block.assoc = NULL;
1820 gfc_association_list* newAssoc = gfc_get_association_list ();
1821 gfc_association_list* a;
1823 /* Match the next association. */
1824 if (gfc_match (" %n => %e", newAssoc->name, &newAssoc->target)
1827 gfc_error ("Expected association at %C");
1828 goto assocListError;
1831 /* Check that the current name is not yet in the list. */
1832 for (a = new_st.ext.block.assoc; a; a = a->next)
1833 if (!strcmp (a->name, newAssoc->name))
1835 gfc_error ("Duplicate name '%s' in association at %C",
1837 goto assocListError;
1840 /* The target expression must not be coindexed. */
1841 if (gfc_is_coindexed (newAssoc->target))
1843 gfc_error ("Association target at %C must not be coindexed");
1844 goto assocListError;
1847 /* The target is a variable (and may be used as lvalue) if it's an
1848 EXPR_VARIABLE and does not have vector-subscripts. */
1849 newAssoc->variable = (newAssoc->target->expr_type == EXPR_VARIABLE
1850 && !gfc_has_vector_subscript (newAssoc->target));
1852 /* Put it into the list. */
1853 newAssoc->next = new_st.ext.block.assoc;
1854 new_st.ext.block.assoc = newAssoc;
1856 /* Try next one or end if closing parenthesis is found. */
1857 gfc_gobble_whitespace ();
1858 if (gfc_peek_char () == ')')
1860 if (gfc_match_char (',') != MATCH_YES)
1862 gfc_error ("Expected ')' or ',' at %C");
1869 gfc_free (newAssoc);
1872 if (gfc_match_char (')') != MATCH_YES)
1874 /* This should never happen as we peek above. */
1878 if (gfc_match_eos () != MATCH_YES)
1880 gfc_error ("Junk after ASSOCIATE statement at %C");
1887 gfc_free_association_list (new_st.ext.block.assoc);
1892 /* Match a DO statement. */
1897 gfc_iterator iter, *ip;
1899 gfc_st_label *label;
1902 old_loc = gfc_current_locus;
1905 iter.var = iter.start = iter.end = iter.step = NULL;
1907 m = gfc_match_label ();
1908 if (m == MATCH_ERROR)
1911 if (gfc_match (" do") != MATCH_YES)
1914 m = gfc_match_st_label (&label);
1915 if (m == MATCH_ERROR)
1918 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1920 if (gfc_match_eos () == MATCH_YES)
1922 iter.end = gfc_get_logical_expr (gfc_default_logical_kind, NULL, true);
1923 new_st.op = EXEC_DO_WHILE;
1927 /* Match an optional comma, if no comma is found, a space is obligatory. */
1928 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1931 /* Check for balanced parens. */
1933 if (gfc_match_parens () == MATCH_ERROR)
1936 /* See if we have a DO WHILE. */
1937 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1939 new_st.op = EXEC_DO_WHILE;
1943 /* The abortive DO WHILE may have done something to the symbol
1944 table, so we start over. */
1945 gfc_undo_symbols ();
1946 gfc_current_locus = old_loc;
1948 gfc_match_label (); /* This won't error. */
1949 gfc_match (" do "); /* This will work. */
1951 gfc_match_st_label (&label); /* Can't error out. */
1952 gfc_match_char (','); /* Optional comma. */
1954 m = gfc_match_iterator (&iter, 0);
1957 if (m == MATCH_ERROR)
1960 iter.var->symtree->n.sym->attr.implied_index = 0;
1961 gfc_check_do_variable (iter.var->symtree);
1963 if (gfc_match_eos () != MATCH_YES)
1965 gfc_syntax_error (ST_DO);
1969 new_st.op = EXEC_DO;
1973 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1976 new_st.label1 = label;
1978 if (new_st.op == EXEC_DO_WHILE)
1979 new_st.expr1 = iter.end;
1982 new_st.ext.iterator = ip = gfc_get_iterator ();
1989 gfc_free_iterator (&iter, 0);
1995 /* Match an EXIT or CYCLE statement. */
1998 match_exit_cycle (gfc_statement st, gfc_exec_op op)
2000 gfc_state_data *p, *o;
2005 if (gfc_match_eos () == MATCH_YES)
2009 m = gfc_match ("% %s%t", &sym);
2010 if (m == MATCH_ERROR)
2014 gfc_syntax_error (st);
2018 if (sym->attr.flavor != FL_LABEL)
2020 gfc_error ("Name '%s' in %s statement at %C is not a loop name",
2021 sym->name, gfc_ascii_statement (st));
2026 /* Find the loop specified by the label (or lack of a label). */
2027 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
2028 if (p->state == COMP_DO && (sym == NULL || sym == p->sym))
2030 else if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
2032 else if (p->state == COMP_CRITICAL)
2034 gfc_error("%s statement at %C leaves CRITICAL construct",
2035 gfc_ascii_statement (st));
2042 gfc_error ("%s statement at %C is not within a loop",
2043 gfc_ascii_statement (st));
2045 gfc_error ("%s statement at %C is not within loop '%s'",
2046 gfc_ascii_statement (st), sym->name);
2053 gfc_error ("%s statement at %C leaving OpenMP structured block",
2054 gfc_ascii_statement (st));
2058 for (o = p, cnt = 0; o->state == COMP_DO && o->previous != NULL; cnt++)
2062 && o->state == COMP_OMP_STRUCTURED_BLOCK
2063 && (o->head->op == EXEC_OMP_DO
2064 || o->head->op == EXEC_OMP_PARALLEL_DO))
2067 gcc_assert (o->head->next != NULL
2068 && (o->head->next->op == EXEC_DO
2069 || o->head->next->op == EXEC_DO_WHILE)
2070 && o->previous != NULL
2071 && o->previous->tail->op == o->head->op);
2072 if (o->previous->tail->ext.omp_clauses != NULL
2073 && o->previous->tail->ext.omp_clauses->collapse > 1)
2074 collapse = o->previous->tail->ext.omp_clauses->collapse;
2075 if (st == ST_EXIT && cnt <= collapse)
2077 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
2080 if (st == ST_CYCLE && cnt < collapse)
2082 gfc_error ("CYCLE statement at %C to non-innermost collapsed !$OMP DO loop");
2087 /* Save the first statement in the loop - needed by the backend. */
2088 new_st.ext.whichloop = p->head;
2096 /* Match the EXIT statement. */
2099 gfc_match_exit (void)
2101 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
2105 /* Match the CYCLE statement. */
2108 gfc_match_cycle (void)
2110 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
2114 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
2117 gfc_match_stopcode (gfc_statement st)
2124 if (gfc_match_eos () != MATCH_YES)
2126 m = gfc_match_init_expr (&e);
2127 if (m == MATCH_ERROR)
2132 if (gfc_match_eos () != MATCH_YES)
2136 if (gfc_pure (NULL))
2138 gfc_error ("%s statement not allowed in PURE procedure at %C",
2139 gfc_ascii_statement (st));
2143 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2145 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2151 if (!(e->ts.type == BT_CHARACTER || e->ts.type == BT_INTEGER))
2153 gfc_error ("STOP code at %L must be either INTEGER or CHARACTER type",
2160 gfc_error ("STOP code at %L must be scalar",
2165 if (e->ts.type == BT_CHARACTER
2166 && e->ts.kind != gfc_default_character_kind)
2168 gfc_error ("STOP code at %L must be default character KIND=%d",
2169 &e->where, (int) gfc_default_character_kind);
2173 if (e->ts.type == BT_INTEGER
2174 && e->ts.kind != gfc_default_integer_kind)
2176 gfc_error ("STOP code at %L must be default integer KIND=%d",
2177 &e->where, (int) gfc_default_integer_kind);
2185 new_st.op = EXEC_STOP;
2188 new_st.op = EXEC_ERROR_STOP;
2191 new_st.op = EXEC_PAUSE;
2198 new_st.ext.stop_code = -1;
2203 gfc_syntax_error (st);
2212 /* Match the (deprecated) PAUSE statement. */
2215 gfc_match_pause (void)
2219 m = gfc_match_stopcode (ST_PAUSE);
2222 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2231 /* Match the STOP statement. */
2234 gfc_match_stop (void)
2236 return gfc_match_stopcode (ST_STOP);
2240 /* Match the ERROR STOP statement. */
2243 gfc_match_error_stop (void)
2245 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2249 return gfc_match_stopcode (ST_ERROR_STOP);
2253 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2254 SYNC ALL [(sync-stat-list)]
2255 SYNC MEMORY [(sync-stat-list)]
2256 SYNC IMAGES (image-set [, sync-stat-list] )
2257 with sync-stat is int-expr or *. */
2260 sync_statement (gfc_statement st)
2263 gfc_expr *tmp, *imageset, *stat, *errmsg;
2264 bool saw_stat, saw_errmsg;
2266 tmp = imageset = stat = errmsg = NULL;
2267 saw_stat = saw_errmsg = false;
2269 if (gfc_pure (NULL))
2271 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2275 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2279 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2281 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2285 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2287 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2291 if (gfc_match_eos () == MATCH_YES)
2293 if (st == ST_SYNC_IMAGES)
2298 if (gfc_match_char ('(') != MATCH_YES)
2301 if (st == ST_SYNC_IMAGES)
2303 /* Denote '*' as imageset == NULL. */
2304 m = gfc_match_char ('*');
2305 if (m == MATCH_ERROR)
2309 if (gfc_match ("%e", &imageset) != MATCH_YES)
2312 m = gfc_match_char (',');
2313 if (m == MATCH_ERROR)
2317 m = gfc_match_char (')');
2326 m = gfc_match (" stat = %v", &tmp);
2327 if (m == MATCH_ERROR)
2333 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2339 if (gfc_match_char (',') == MATCH_YES)
2343 m = gfc_match (" errmsg = %v", &tmp);
2344 if (m == MATCH_ERROR)
2350 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2356 if (gfc_match_char (',') == MATCH_YES)
2360 gfc_gobble_whitespace ();
2362 if (gfc_peek_char () == ')')
2368 if (gfc_match (" )%t") != MATCH_YES)
2375 new_st.op = EXEC_SYNC_ALL;
2377 case ST_SYNC_IMAGES:
2378 new_st.op = EXEC_SYNC_IMAGES;
2380 case ST_SYNC_MEMORY:
2381 new_st.op = EXEC_SYNC_MEMORY;
2387 new_st.expr1 = imageset;
2388 new_st.expr2 = stat;
2389 new_st.expr3 = errmsg;
2394 gfc_syntax_error (st);
2397 gfc_free_expr (tmp);
2398 gfc_free_expr (imageset);
2399 gfc_free_expr (stat);
2400 gfc_free_expr (errmsg);
2406 /* Match SYNC ALL statement. */
2409 gfc_match_sync_all (void)
2411 return sync_statement (ST_SYNC_ALL);
2415 /* Match SYNC IMAGES statement. */
2418 gfc_match_sync_images (void)
2420 return sync_statement (ST_SYNC_IMAGES);
2424 /* Match SYNC MEMORY statement. */
2427 gfc_match_sync_memory (void)
2429 return sync_statement (ST_SYNC_MEMORY);
2433 /* Match a CONTINUE statement. */
2436 gfc_match_continue (void)
2438 if (gfc_match_eos () != MATCH_YES)
2440 gfc_syntax_error (ST_CONTINUE);
2444 new_st.op = EXEC_CONTINUE;
2449 /* Match the (deprecated) ASSIGN statement. */
2452 gfc_match_assign (void)
2455 gfc_st_label *label;
2457 if (gfc_match (" %l", &label) == MATCH_YES)
2459 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2461 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2463 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2468 expr->symtree->n.sym->attr.assign = 1;
2470 new_st.op = EXEC_LABEL_ASSIGN;
2471 new_st.label1 = label;
2472 new_st.expr1 = expr;
2480 /* Match the GO TO statement. As a computed GOTO statement is
2481 matched, it is transformed into an equivalent SELECT block. No
2482 tree is necessary, and the resulting jumps-to-jumps are
2483 specifically optimized away by the back end. */
2486 gfc_match_goto (void)
2488 gfc_code *head, *tail;
2491 gfc_st_label *label;
2495 if (gfc_match (" %l%t", &label) == MATCH_YES)
2497 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2500 new_st.op = EXEC_GOTO;
2501 new_st.label1 = label;
2505 /* The assigned GO TO statement. */
2507 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2509 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2514 new_st.op = EXEC_GOTO;
2515 new_st.expr1 = expr;
2517 if (gfc_match_eos () == MATCH_YES)
2520 /* Match label list. */
2521 gfc_match_char (',');
2522 if (gfc_match_char ('(') != MATCH_YES)
2524 gfc_syntax_error (ST_GOTO);
2531 m = gfc_match_st_label (&label);
2535 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2539 head = tail = gfc_get_code ();
2542 tail->block = gfc_get_code ();
2546 tail->label1 = label;
2547 tail->op = EXEC_GOTO;
2549 while (gfc_match_char (',') == MATCH_YES);
2551 if (gfc_match (")%t") != MATCH_YES)
2556 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2559 new_st.block = head;
2564 /* Last chance is a computed GO TO statement. */
2565 if (gfc_match_char ('(') != MATCH_YES)
2567 gfc_syntax_error (ST_GOTO);
2576 m = gfc_match_st_label (&label);
2580 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2584 head = tail = gfc_get_code ();
2587 tail->block = gfc_get_code ();
2591 cp = gfc_get_case ();
2592 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2595 tail->op = EXEC_SELECT;
2596 tail->ext.case_list = cp;
2598 tail->next = gfc_get_code ();
2599 tail->next->op = EXEC_GOTO;
2600 tail->next->label1 = label;
2602 while (gfc_match_char (',') == MATCH_YES);
2604 if (gfc_match_char (')') != MATCH_YES)
2609 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2613 /* Get the rest of the statement. */
2614 gfc_match_char (',');
2616 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2619 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2620 "at %C") == FAILURE)
2623 /* At this point, a computed GOTO has been fully matched and an
2624 equivalent SELECT statement constructed. */
2626 new_st.op = EXEC_SELECT;
2627 new_st.expr1 = NULL;
2629 /* Hack: For a "real" SELECT, the expression is in expr. We put
2630 it in expr2 so we can distinguish then and produce the correct
2632 new_st.expr2 = expr;
2633 new_st.block = head;
2637 gfc_syntax_error (ST_GOTO);
2639 gfc_free_statements (head);
2644 /* Frees a list of gfc_alloc structures. */
2647 gfc_free_alloc_list (gfc_alloc *p)
2654 gfc_free_expr (p->expr);
2660 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2661 an accessible derived type. */
2664 match_derived_type_spec (gfc_typespec *ts)
2667 gfc_symbol *derived;
2669 old_locus = gfc_current_locus;
2671 if (gfc_match_symbol (&derived, 1) == MATCH_YES)
2673 if (derived->attr.flavor == FL_DERIVED)
2675 ts->type = BT_DERIVED;
2676 ts->u.derived = derived;
2681 /* Enforce F03:C476. */
2682 gfc_error ("'%s' at %L is not an accessible derived type",
2683 derived->name, &gfc_current_locus);
2688 gfc_current_locus = old_locus;
2693 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2694 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2695 It only includes the intrinsic types from the Fortran 2003 standard
2696 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2697 the implicit_flag is not needed, so it was removed. Derived types are
2698 identified by their name alone. */
2701 match_type_spec (gfc_typespec *ts)
2707 old_locus = gfc_current_locus;
2709 if (gfc_match ("integer") == MATCH_YES)
2711 ts->type = BT_INTEGER;
2712 ts->kind = gfc_default_integer_kind;
2716 if (gfc_match ("real") == MATCH_YES)
2719 ts->kind = gfc_default_real_kind;
2723 if (gfc_match ("double precision") == MATCH_YES)
2726 ts->kind = gfc_default_double_kind;
2730 if (gfc_match ("complex") == MATCH_YES)
2732 ts->type = BT_COMPLEX;
2733 ts->kind = gfc_default_complex_kind;
2737 if (gfc_match ("character") == MATCH_YES)
2739 ts->type = BT_CHARACTER;
2743 if (gfc_match ("logical") == MATCH_YES)
2745 ts->type = BT_LOGICAL;
2746 ts->kind = gfc_default_logical_kind;
2750 m = match_derived_type_spec (ts);
2753 old_locus = gfc_current_locus;
2754 if (gfc_match (" :: ") != MATCH_YES)
2756 gfc_current_locus = old_locus;
2757 /* Enfore F03:C401. */
2758 if (ts->u.derived->attr.abstract)
2760 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2761 ts->u.derived->name, &old_locus);
2766 else if (m == MATCH_ERROR && gfc_match (" :: ") == MATCH_YES)
2769 /* If a type is not matched, simply return MATCH_NO. */
2770 gfc_current_locus = old_locus;
2775 gfc_gobble_whitespace ();
2776 if (gfc_peek_ascii_char () == '*')
2778 gfc_error ("Invalid type-spec at %C");
2782 m = gfc_match_kind_spec (ts, false);
2785 m = MATCH_YES; /* No kind specifier found. */
2791 m = gfc_match_char_spec (ts);
2794 m = MATCH_YES; /* No kind specifier found. */
2800 /* Match an ALLOCATE statement. */
2803 gfc_match_allocate (void)
2805 gfc_alloc *head, *tail;
2806 gfc_expr *stat, *errmsg, *tmp, *source, *mold;
2811 bool saw_stat, saw_errmsg, saw_source, saw_mold, b1, b2, b3;
2814 stat = errmsg = source = mold = tmp = NULL;
2815 saw_stat = saw_errmsg = saw_source = saw_mold = false;
2817 if (gfc_match_char ('(') != MATCH_YES)
2820 /* Match an optional type-spec. */
2821 old_locus = gfc_current_locus;
2822 m = match_type_spec (&ts);
2823 if (m == MATCH_ERROR)
2825 else if (m == MATCH_NO)
2826 ts.type = BT_UNKNOWN;
2829 if (gfc_match (" :: ") == MATCH_YES)
2831 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2832 "ALLOCATE at %L", &old_locus) == FAILURE)
2837 ts.type = BT_UNKNOWN;
2838 gfc_current_locus = old_locus;
2845 head = tail = gfc_get_alloc ();
2848 tail->next = gfc_get_alloc ();
2852 m = gfc_match_variable (&tail->expr, 0);
2855 if (m == MATCH_ERROR)
2858 if (gfc_check_do_variable (tail->expr->symtree))
2861 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2863 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2867 /* The ALLOCATE statement had an optional typespec. Check the
2869 if (ts.type != BT_UNKNOWN)
2871 /* Enforce F03:C624. */
2872 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2874 gfc_error ("Type of entity at %L is type incompatible with "
2875 "typespec", &tail->expr->where);
2879 /* Enforce F03:C627. */
2880 if (ts.kind != tail->expr->ts.kind)
2882 gfc_error ("Kind type parameter for entity at %L differs from "
2883 "the kind type parameter of the typespec",
2884 &tail->expr->where);
2889 if (tail->expr->ts.type == BT_DERIVED)
2890 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2892 /* FIXME: disable the checking on derived types and arrays. */
2893 sym = tail->expr->symtree->n.sym;
2894 b1 = !(tail->expr->ref
2895 && (tail->expr->ref->type == REF_COMPONENT
2896 || tail->expr->ref->type == REF_ARRAY));
2897 if (sym && sym->ts.type == BT_CLASS)
2898 b2 = !(CLASS_DATA (sym)->attr.allocatable
2899 || CLASS_DATA (sym)->attr.class_pointer);
2901 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2902 || sym->attr.proc_pointer);
2903 b3 = sym && sym->ns && sym->ns->proc_name
2904 && (sym->ns->proc_name->attr.allocatable
2905 || sym->ns->proc_name->attr.pointer
2906 || sym->ns->proc_name->attr.proc_pointer);
2907 if (b1 && b2 && !b3)
2909 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2910 "or an allocatable variable");
2914 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2916 gfc_error ("Shape specification for allocatable scalar at %C");
2920 if (gfc_match_char (',') != MATCH_YES)
2925 m = gfc_match (" stat = %v", &tmp);
2926 if (m == MATCH_ERROR)
2933 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2940 if (gfc_check_do_variable (stat->symtree))
2943 if (gfc_match_char (',') == MATCH_YES)
2944 goto alloc_opt_list;
2947 m = gfc_match (" errmsg = %v", &tmp);
2948 if (m == MATCH_ERROR)
2952 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
2953 &tmp->where) == FAILURE)
2959 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2966 if (gfc_match_char (',') == MATCH_YES)
2967 goto alloc_opt_list;
2970 m = gfc_match (" source = %e", &tmp);
2971 if (m == MATCH_ERROR)
2975 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
2976 &tmp->where) == FAILURE)
2982 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
2986 /* The next 2 conditionals check C631. */
2987 if (ts.type != BT_UNKNOWN)
2989 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
2990 &tmp->where, &old_locus);
2996 gfc_error ("SOURCE tag at %L requires only a single entity in "
2997 "the allocation-list", &tmp->where);
3004 if (gfc_match_char (',') == MATCH_YES)
3005 goto alloc_opt_list;
3008 m = gfc_match (" mold = %e", &tmp);
3009 if (m == MATCH_ERROR)
3013 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: MOLD tag at %L",
3014 &tmp->where) == FAILURE)
3017 /* Check F08:C636. */
3020 gfc_error ("Redundant MOLD tag found at %L ", &tmp->where);
3024 /* Check F08:C637. */
3025 if (ts.type != BT_UNKNOWN)
3027 gfc_error ("MOLD tag at %L conflicts with the typespec at %L",
3028 &tmp->where, &old_locus);
3036 if (gfc_match_char (',') == MATCH_YES)
3037 goto alloc_opt_list;
3040 gfc_gobble_whitespace ();
3042 if (gfc_peek_char () == ')')
3047 if (gfc_match (" )%t") != MATCH_YES)
3050 /* Check F08:C637. */
3053 gfc_error ("MOLD tag at %L conflicts with SOURCE tag at %L",
3054 &mold->where, &source->where);
3058 new_st.op = EXEC_ALLOCATE;
3059 new_st.expr1 = stat;
3060 new_st.expr2 = errmsg;
3062 new_st.expr3 = source;
3064 new_st.expr3 = mold;
3065 new_st.ext.alloc.list = head;
3066 new_st.ext.alloc.ts = ts;
3071 gfc_syntax_error (ST_ALLOCATE);
3074 gfc_free_expr (errmsg);
3075 gfc_free_expr (source);
3076 gfc_free_expr (stat);
3077 gfc_free_expr (mold);
3078 if (tmp && tmp->expr_type) gfc_free_expr (tmp);
3079 gfc_free_alloc_list (head);
3084 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
3085 a set of pointer assignments to intrinsic NULL(). */
3088 gfc_match_nullify (void)
3096 if (gfc_match_char ('(') != MATCH_YES)
3101 m = gfc_match_variable (&p, 0);
3102 if (m == MATCH_ERROR)
3107 if (gfc_check_do_variable (p->symtree))
3110 if (gfc_pure (NULL) && gfc_impure_variable (p->symtree->n.sym))
3112 gfc_error ("Illegal variable in NULLIFY at %C for a PURE procedure");
3116 /* build ' => NULL() '. */
3117 e = gfc_get_null_expr (&gfc_current_locus);
3119 /* Chain to list. */
3124 tail->next = gfc_get_code ();
3128 tail->op = EXEC_POINTER_ASSIGN;
3132 if (gfc_match (" )%t") == MATCH_YES)
3134 if (gfc_match_char (',') != MATCH_YES)
3141 gfc_syntax_error (ST_NULLIFY);
3144 gfc_free_statements (new_st.next);
3146 gfc_free_expr (new_st.expr1);
3147 new_st.expr1 = NULL;
3148 gfc_free_expr (new_st.expr2);
3149 new_st.expr2 = NULL;
3154 /* Match a DEALLOCATE statement. */
3157 gfc_match_deallocate (void)
3159 gfc_alloc *head, *tail;
3160 gfc_expr *stat, *errmsg, *tmp;
3163 bool saw_stat, saw_errmsg, b1, b2;
3166 stat = errmsg = tmp = NULL;
3167 saw_stat = saw_errmsg = false;
3169 if (gfc_match_char ('(') != MATCH_YES)
3175 head = tail = gfc_get_alloc ();
3178 tail->next = gfc_get_alloc ();
3182 m = gfc_match_variable (&tail->expr, 0);
3183 if (m == MATCH_ERROR)
3188 if (gfc_check_do_variable (tail->expr->symtree))
3191 sym = tail->expr->symtree->n.sym;
3193 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3195 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3199 /* FIXME: disable the checking on derived types. */
3200 b1 = !(tail->expr->ref
3201 && (tail->expr->ref->type == REF_COMPONENT
3202 || tail->expr->ref->type == REF_ARRAY));
3203 if (sym && sym->ts.type == BT_CLASS)
3204 b2 = !(CLASS_DATA (sym)->attr.allocatable
3205 || CLASS_DATA (sym)->attr.class_pointer);
3207 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3208 || sym->attr.proc_pointer);
3211 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3212 "or an allocatable variable");
3216 if (gfc_match_char (',') != MATCH_YES)
3221 m = gfc_match (" stat = %v", &tmp);
3222 if (m == MATCH_ERROR)
3228 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3229 gfc_free_expr (tmp);
3236 if (gfc_check_do_variable (stat->symtree))
3239 if (gfc_match_char (',') == MATCH_YES)
3240 goto dealloc_opt_list;
3243 m = gfc_match (" errmsg = %v", &tmp);
3244 if (m == MATCH_ERROR)
3248 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3249 &tmp->where) == FAILURE)
3254 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3255 gfc_free_expr (tmp);
3262 if (gfc_match_char (',') == MATCH_YES)
3263 goto dealloc_opt_list;
3266 gfc_gobble_whitespace ();
3268 if (gfc_peek_char () == ')')
3272 if (gfc_match (" )%t") != MATCH_YES)
3275 new_st.op = EXEC_DEALLOCATE;
3276 new_st.expr1 = stat;
3277 new_st.expr2 = errmsg;
3278 new_st.ext.alloc.list = head;
3283 gfc_syntax_error (ST_DEALLOCATE);
3286 gfc_free_expr (errmsg);
3287 gfc_free_expr (stat);
3288 gfc_free_alloc_list (head);
3293 /* Match a RETURN statement. */
3296 gfc_match_return (void)
3300 gfc_compile_state s;
3304 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3306 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3310 if (gfc_match_eos () == MATCH_YES)
3313 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3315 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3320 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3321 "at %C") == FAILURE)
3324 if (gfc_current_form == FORM_FREE)
3326 /* The following are valid, so we can't require a blank after the
3330 char c = gfc_peek_ascii_char ();
3331 if (ISALPHA (c) || ISDIGIT (c))
3335 m = gfc_match (" %e%t", &e);
3338 if (m == MATCH_ERROR)
3341 gfc_syntax_error (ST_RETURN);
3348 gfc_enclosing_unit (&s);
3349 if (s == COMP_PROGRAM
3350 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3351 "main program at %C") == FAILURE)
3354 new_st.op = EXEC_RETURN;
3361 /* Match the call of a type-bound procedure, if CALL%var has already been
3362 matched and var found to be a derived-type variable. */
3365 match_typebound_call (gfc_symtree* varst)
3370 base = gfc_get_expr ();
3371 base->expr_type = EXPR_VARIABLE;
3372 base->symtree = varst;
3373 base->where = gfc_current_locus;
3374 gfc_set_sym_referenced (varst->n.sym);
3376 m = gfc_match_varspec (base, 0, true, true);
3378 gfc_error ("Expected component reference at %C");
3382 if (gfc_match_eos () != MATCH_YES)
3384 gfc_error ("Junk after CALL at %C");
3388 if (base->expr_type == EXPR_COMPCALL)
3389 new_st.op = EXEC_COMPCALL;
3390 else if (base->expr_type == EXPR_PPC)
3391 new_st.op = EXEC_CALL_PPC;
3394 gfc_error ("Expected type-bound procedure or procedure pointer component "
3398 new_st.expr1 = base;
3404 /* Match a CALL statement. The tricky part here are possible
3405 alternate return specifiers. We handle these by having all
3406 "subroutines" actually return an integer via a register that gives
3407 the return number. If the call specifies alternate returns, we
3408 generate code for a SELECT statement whose case clauses contain
3409 GOTOs to the various labels. */
3412 gfc_match_call (void)
3414 char name[GFC_MAX_SYMBOL_LEN + 1];
3415 gfc_actual_arglist *a, *arglist;
3425 m = gfc_match ("% %n", name);
3431 if (gfc_get_ha_sym_tree (name, &st))
3436 /* If this is a variable of derived-type, it probably starts a type-bound
3438 if ((sym->attr.flavor != FL_PROCEDURE
3439 || gfc_is_function_return_value (sym, gfc_current_ns))
3440 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3441 return match_typebound_call (st);
3443 /* If it does not seem to be callable (include functions so that the
3444 right association is made. They are thrown out in resolution.)
3446 if (!sym->attr.generic
3447 && !sym->attr.subroutine
3448 && !sym->attr.function)
3450 if (!(sym->attr.external && !sym->attr.referenced))
3452 /* ...create a symbol in this scope... */
3453 if (sym->ns != gfc_current_ns
3454 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3457 if (sym != st->n.sym)
3461 /* ...and then to try to make the symbol into a subroutine. */
3462 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3466 gfc_set_sym_referenced (sym);
3468 if (gfc_match_eos () != MATCH_YES)
3470 m = gfc_match_actual_arglist (1, &arglist);
3473 if (m == MATCH_ERROR)
3476 if (gfc_match_eos () != MATCH_YES)
3480 /* If any alternate return labels were found, construct a SELECT
3481 statement that will jump to the right place. */
3484 for (a = arglist; a; a = a->next)
3485 if (a->expr == NULL)
3490 gfc_symtree *select_st;
3491 gfc_symbol *select_sym;
3492 char name[GFC_MAX_SYMBOL_LEN + 1];
3494 new_st.next = c = gfc_get_code ();
3495 c->op = EXEC_SELECT;
3496 sprintf (name, "_result_%s", sym->name);
3497 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3499 select_sym = select_st->n.sym;
3500 select_sym->ts.type = BT_INTEGER;
3501 select_sym->ts.kind = gfc_default_integer_kind;
3502 gfc_set_sym_referenced (select_sym);
3503 c->expr1 = gfc_get_expr ();
3504 c->expr1->expr_type = EXPR_VARIABLE;
3505 c->expr1->symtree = select_st;
3506 c->expr1->ts = select_sym->ts;
3507 c->expr1->where = gfc_current_locus;
3510 for (a = arglist; a; a = a->next)
3512 if (a->expr != NULL)
3515 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3520 c->block = gfc_get_code ();
3522 c->op = EXEC_SELECT;
3524 new_case = gfc_get_case ();
3525 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3526 new_case->low = new_case->high;
3527 c->ext.case_list = new_case;
3529 c->next = gfc_get_code ();
3530 c->next->op = EXEC_GOTO;
3531 c->next->label1 = a->label;
3535 new_st.op = EXEC_CALL;
3536 new_st.symtree = st;
3537 new_st.ext.actual = arglist;
3542 gfc_syntax_error (ST_CALL);
3545 gfc_free_actual_arglist (arglist);
3550 /* Given a name, return a pointer to the common head structure,
3551 creating it if it does not exist. If FROM_MODULE is nonzero, we
3552 mangle the name so that it doesn't interfere with commons defined
3553 in the using namespace.
3554 TODO: Add to global symbol tree. */
3557 gfc_get_common (const char *name, int from_module)
3560 static int serial = 0;
3561 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3565 /* A use associated common block is only needed to correctly layout
3566 the variables it contains. */
3567 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3568 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3572 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3575 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3578 if (st->n.common == NULL)
3580 st->n.common = gfc_get_common_head ();
3581 st->n.common->where = gfc_current_locus;
3582 strcpy (st->n.common->name, name);
3585 return st->n.common;
3589 /* Match a common block name. */
3591 match match_common_name (char *name)
3595 if (gfc_match_char ('/') == MATCH_NO)
3601 if (gfc_match_char ('/') == MATCH_YES)
3607 m = gfc_match_name (name);
3609 if (m == MATCH_ERROR)
3611 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3614 gfc_error ("Syntax error in common block name at %C");
3619 /* Match a COMMON statement. */
3622 gfc_match_common (void)
3624 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3625 char name[GFC_MAX_SYMBOL_LEN + 1];
3632 old_blank_common = gfc_current_ns->blank_common.head;
3633 if (old_blank_common)
3635 while (old_blank_common->common_next)
3636 old_blank_common = old_blank_common->common_next;
3643 m = match_common_name (name);
3644 if (m == MATCH_ERROR)
3647 gsym = gfc_get_gsymbol (name);
3648 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3650 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3651 "is not COMMON", name);
3655 if (gsym->type == GSYM_UNKNOWN)
3657 gsym->type = GSYM_COMMON;
3658 gsym->where = gfc_current_locus;
3664 if (name[0] == '\0')
3666 t = &gfc_current_ns->blank_common;
3667 if (t->head == NULL)
3668 t->where = gfc_current_locus;
3672 t = gfc_get_common (name, 0);
3681 while (tail->common_next)
3682 tail = tail->common_next;
3685 /* Grab the list of symbols. */
3688 m = gfc_match_symbol (&sym, 0);
3689 if (m == MATCH_ERROR)
3694 /* Store a ref to the common block for error checking. */
3695 sym->common_block = t;
3697 /* See if we know the current common block is bind(c), and if
3698 so, then see if we can check if the symbol is (which it'll
3699 need to be). This can happen if the bind(c) attr stmt was
3700 applied to the common block, and the variable(s) already
3701 defined, before declaring the common block. */
3702 if (t->is_bind_c == 1)
3704 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3706 /* If we find an error, just print it and continue,
3707 cause it's just semantic, and we can see if there
3709 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3710 "at %C must be declared with a C "
3711 "interoperable kind since common block "
3713 sym->name, &(sym->declared_at), t->name,
3717 if (sym->attr.is_bind_c == 1)
3718 gfc_error_now ("Variable '%s' in common block "
3719 "'%s' at %C can not be bind(c) since "
3720 "it is not global", sym->name, t->name);
3723 if (sym->attr.in_common)
3725 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3730 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3731 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3733 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3734 "can only be COMMON in "
3735 "BLOCK DATA", sym->name)
3740 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3744 tail->common_next = sym;
3750 /* Deal with an optional array specification after the
3752 m = gfc_match_array_spec (&as, true, true);
3753 if (m == MATCH_ERROR)
3758 if (as->type != AS_EXPLICIT)
3760 gfc_error ("Array specification for symbol '%s' in COMMON "
3761 "at %C must be explicit", sym->name);
3765 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3768 if (sym->attr.pointer)
3770 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3771 "POINTER array", sym->name);
3780 sym->common_head = t;
3782 /* Check to see if the symbol is already in an equivalence group.
3783 If it is, set the other members as being in common. */
3784 if (sym->attr.in_equivalence)
3786 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3788 for (e2 = e1; e2; e2 = e2->eq)
3789 if (e2->expr->symtree->n.sym == sym)
3796 for (e2 = e1; e2; e2 = e2->eq)
3798 other = e2->expr->symtree->n.sym;
3799 if (other->common_head
3800 && other->common_head != sym->common_head)
3802 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3803 "%C is being indirectly equivalenced to "
3804 "another COMMON block '%s'",
3805 sym->name, sym->common_head->name,
3806 other->common_head->name);
3809 other->attr.in_common = 1;
3810 other->common_head = t;
3816 gfc_gobble_whitespace ();
3817 if (gfc_match_eos () == MATCH_YES)
3819 if (gfc_peek_ascii_char () == '/')
3821 if (gfc_match_char (',') != MATCH_YES)
3823 gfc_gobble_whitespace ();
3824 if (gfc_peek_ascii_char () == '/')
3833 gfc_syntax_error (ST_COMMON);
3836 if (old_blank_common)
3837 old_blank_common->common_next = NULL;
3839 gfc_current_ns->blank_common.head = NULL;
3840 gfc_free_array_spec (as);
3845 /* Match a BLOCK DATA program unit. */
3848 gfc_match_block_data (void)
3850 char name[GFC_MAX_SYMBOL_LEN + 1];
3854 if (gfc_match_eos () == MATCH_YES)
3856 gfc_new_block = NULL;
3860 m = gfc_match ("% %n%t", name);
3864 if (gfc_get_symbol (name, NULL, &sym))
3867 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3870 gfc_new_block = sym;
3876 /* Free a namelist structure. */
3879 gfc_free_namelist (gfc_namelist *name)
3883 for (; name; name = n)
3891 /* Match a NAMELIST statement. */
3894 gfc_match_namelist (void)
3896 gfc_symbol *group_name, *sym;
3900 m = gfc_match (" / %s /", &group_name);
3903 if (m == MATCH_ERROR)
3908 if (group_name->ts.type != BT_UNKNOWN)
3910 gfc_error ("Namelist group name '%s' at %C already has a basic "
3911 "type of %s", group_name->name,
3912 gfc_typename (&group_name->ts));
3916 if (group_name->attr.flavor == FL_NAMELIST
3917 && group_name->attr.use_assoc
3918 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3919 "at %C already is USE associated and can"
3920 "not be respecified.", group_name->name)
3924 if (group_name->attr.flavor != FL_NAMELIST
3925 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3926 group_name->name, NULL) == FAILURE)
3931 m = gfc_match_symbol (&sym, 1);
3934 if (m == MATCH_ERROR)
3937 if (sym->attr.in_namelist == 0
3938 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
3941 /* Use gfc_error_check here, rather than goto error, so that
3942 these are the only errors for the next two lines. */
3943 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
3945 gfc_error ("Assumed size array '%s' in namelist '%s' at "
3946 "%C is not allowed", sym->name, group_name->name);
3950 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
3952 gfc_error ("Assumed character length '%s' in namelist '%s' at "
3953 "%C is not allowed", sym->name, group_name->name);
3957 nl = gfc_get_namelist ();
3961 if (group_name->namelist == NULL)
3962 group_name->namelist = group_name->namelist_tail = nl;
3965 group_name->namelist_tail->next = nl;
3966 group_name->namelist_tail = nl;
3969 if (gfc_match_eos () == MATCH_YES)
3972 m = gfc_match_char (',');
3974 if (gfc_match_char ('/') == MATCH_YES)
3976 m2 = gfc_match (" %s /", &group_name);
3977 if (m2 == MATCH_YES)
3979 if (m2 == MATCH_ERROR)
3993 gfc_syntax_error (ST_NAMELIST);
4000 /* Match a MODULE statement. */
4003 gfc_match_module (void)
4007 m = gfc_match (" %s%t", &gfc_new_block);
4011 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
4012 gfc_new_block->name, NULL) == FAILURE)
4019 /* Free equivalence sets and lists. Recursively is the easiest way to
4023 gfc_free_equiv (gfc_equiv *eq)
4028 gfc_free_equiv (eq->eq);
4029 gfc_free_equiv (eq->next);
4030 gfc_free_expr (eq->expr);
4035 /* Match an EQUIVALENCE statement. */
4038 gfc_match_equivalence (void)
4040 gfc_equiv *eq, *set, *tail;
4044 gfc_common_head *common_head = NULL;
4052 eq = gfc_get_equiv ();
4056 eq->next = gfc_current_ns->equiv;
4057 gfc_current_ns->equiv = eq;
4059 if (gfc_match_char ('(') != MATCH_YES)
4063 common_flag = FALSE;
4068 m = gfc_match_equiv_variable (&set->expr);
4069 if (m == MATCH_ERROR)
4074 /* count the number of objects. */
4077 if (gfc_match_char ('%') == MATCH_YES)
4079 gfc_error ("Derived type component %C is not a "
4080 "permitted EQUIVALENCE member");
4084 for (ref = set->expr->ref; ref; ref = ref->next)
4085 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
4087 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
4088 "be an array section");
4092 sym = set->expr->symtree->n.sym;
4094 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
4097 if (sym->attr.in_common)
4100 common_head = sym->common_head;
4103 if (gfc_match_char (')') == MATCH_YES)
4106 if (gfc_match_char (',') != MATCH_YES)
4109 set->eq = gfc_get_equiv ();
4115 gfc_error ("EQUIVALENCE at %C requires two or more objects");
4119 /* If one of the members of an equivalence is in common, then
4120 mark them all as being in common. Before doing this, check
4121 that members of the equivalence group are not in different
4124 for (set = eq; set; set = set->eq)
4126 sym = set->expr->symtree->n.sym;
4127 if (sym->common_head && sym->common_head != common_head)
4129 gfc_error ("Attempt to indirectly overlap COMMON "
4130 "blocks %s and %s by EQUIVALENCE at %C",
4131 sym->common_head->name, common_head->name);
4134 sym->attr.in_common = 1;
4135 sym->common_head = common_head;
4138 if (gfc_match_eos () == MATCH_YES)
4140 if (gfc_match_char (',') != MATCH_YES)
4142 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
4150 gfc_syntax_error (ST_EQUIVALENCE);
4156 gfc_free_equiv (gfc_current_ns->equiv);
4157 gfc_current_ns->equiv = eq;
4163 /* Check that a statement function is not recursive. This is done by looking
4164 for the statement function symbol(sym) by looking recursively through its
4165 expression(e). If a reference to sym is found, true is returned.
4166 12.5.4 requires that any variable of function that is implicitly typed
4167 shall have that type confirmed by any subsequent type declaration. The
4168 implicit typing is conveniently done here. */
4170 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4173 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4179 switch (e->expr_type)
4182 if (e->symtree == NULL)
4185 /* Check the name before testing for nested recursion! */
4186 if (sym->name == e->symtree->n.sym->name)
4189 /* Catch recursion via other statement functions. */
4190 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4191 && e->symtree->n.sym->value
4192 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4195 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4196 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4201 if (e->symtree && sym->name == e->symtree->n.sym->name)
4204 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4205 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4217 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4219 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4223 /* Match a statement function declaration. It is so easy to match
4224 non-statement function statements with a MATCH_ERROR as opposed to
4225 MATCH_NO that we suppress error message in most cases. */
4228 gfc_match_st_function (void)
4230 gfc_error_buf old_error;
4235 m = gfc_match_symbol (&sym, 0);
4239 gfc_push_error (&old_error);
4241 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4242 sym->name, NULL) == FAILURE)
4245 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4248 m = gfc_match (" = %e%t", &expr);
4252 gfc_free_error (&old_error);
4253 if (m == MATCH_ERROR)
4256 if (recursive_stmt_fcn (expr, sym))
4258 gfc_error ("Statement function at %L is recursive", &expr->where);
4264 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4265 "Statement function at %C") == FAILURE)
4271 gfc_pop_error (&old_error);
4276 /***************** SELECT CASE subroutines ******************/
4278 /* Free a single case structure. */
4281 free_case (gfc_case *p)
4283 if (p->low == p->high)
4285 gfc_free_expr (p->low);
4286 gfc_free_expr (p->high);
4291 /* Free a list of case structures. */
4294 gfc_free_case_list (gfc_case *p)
4306 /* Match a single case selector. */
4309 match_case_selector (gfc_case **cp)
4314 c = gfc_get_case ();
4315 c->where = gfc_current_locus;
4317 if (gfc_match_char (':') == MATCH_YES)
4319 m = gfc_match_init_expr (&c->high);
4322 if (m == MATCH_ERROR)
4327 m = gfc_match_init_expr (&c->low);
4328 if (m == MATCH_ERROR)
4333 /* If we're not looking at a ':' now, make a range out of a single
4334 target. Else get the upper bound for the case range. */
4335 if (gfc_match_char (':') != MATCH_YES)
4339 m = gfc_match_init_expr (&c->high);
4340 if (m == MATCH_ERROR)
4342 /* MATCH_NO is fine. It's OK if nothing is there! */
4350 gfc_error ("Expected initialization expression in CASE at %C");
4358 /* Match the end of a case statement. */
4361 match_case_eos (void)
4363 char name[GFC_MAX_SYMBOL_LEN + 1];
4366 if (gfc_match_eos () == MATCH_YES)
4369 /* If the case construct doesn't have a case-construct-name, we
4370 should have matched the EOS. */
4371 if (!gfc_current_block ())
4374 gfc_gobble_whitespace ();
4376 m = gfc_match_name (name);
4380 if (strcmp (name, gfc_current_block ()->name) != 0)
4382 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4383 gfc_current_block ()->name);
4387 return gfc_match_eos ();
4391 /* Match a SELECT statement. */
4394 gfc_match_select (void)
4399 m = gfc_match_label ();
4400 if (m == MATCH_ERROR)
4403 m = gfc_match (" select case ( %e )%t", &expr);
4407 new_st.op = EXEC_SELECT;
4408 new_st.expr1 = expr;
4414 /* Push the current selector onto the SELECT TYPE stack. */
4417 select_type_push (gfc_symbol *sel)
4419 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4420 top->selector = sel;
4422 top->prev = select_type_stack;
4424 select_type_stack = top;
4428 /* Set the temporary for the current SELECT TYPE selector. */
4431 select_type_set_tmp (gfc_typespec *ts)
4433 char name[GFC_MAX_SYMBOL_LEN];
4436 if (!gfc_type_is_extensible (ts->u.derived))
4439 if (ts->type == BT_CLASS)
4440 sprintf (name, "tmp$class$%s", ts->u.derived->name);
4442 sprintf (name, "tmp$type$%s", ts->u.derived->name);
4443 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4444 gfc_add_type (tmp->n.sym, ts, NULL);
4445 gfc_set_sym_referenced (tmp->n.sym);
4446 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4447 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4448 if (ts->type == BT_CLASS)
4450 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4451 &tmp->n.sym->as, false);
4452 tmp->n.sym->attr.class_ok = 1;
4455 select_type_stack->tmp = tmp;
4459 /* Match a SELECT TYPE statement. */
4462 gfc_match_select_type (void)
4464 gfc_expr *expr1, *expr2 = NULL;
4466 char name[GFC_MAX_SYMBOL_LEN];
4468 m = gfc_match_label ();
4469 if (m == MATCH_ERROR)
4472 m = gfc_match (" select type ( ");
4476 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4478 m = gfc_match (" %n => %e", name, &expr2);
4481 expr1 = gfc_get_expr();
4482 expr1->expr_type = EXPR_VARIABLE;
4483 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4488 if (expr2->ts.type == BT_UNKNOWN)
4489 expr1->symtree->n.sym->attr.untyped = 1;
4491 expr1->symtree->n.sym->ts = expr2->ts;
4492 expr1->symtree->n.sym->attr.referenced = 1;
4493 expr1->symtree->n.sym->attr.class_ok = 1;
4497 m = gfc_match (" %e ", &expr1);
4502 m = gfc_match (" )%t");
4506 /* Check for F03:C811. */
4507 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4509 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4510 "use associate-name=>");
4515 new_st.op = EXEC_SELECT_TYPE;
4516 new_st.expr1 = expr1;
4517 new_st.expr2 = expr2;
4518 new_st.ext.block.ns = gfc_current_ns;
4520 select_type_push (expr1->symtree->n.sym);
4525 gfc_current_ns = gfc_current_ns->parent;
4530 /* Match a CASE statement. */
4533 gfc_match_case (void)
4535 gfc_case *c, *head, *tail;
4540 if (gfc_current_state () != COMP_SELECT)
4542 gfc_error ("Unexpected CASE statement at %C");
4546 if (gfc_match ("% default") == MATCH_YES)
4548 m = match_case_eos ();
4551 if (m == MATCH_ERROR)
4554 new_st.op = EXEC_SELECT;
4555 c = gfc_get_case ();
4556 c->where = gfc_current_locus;
4557 new_st.ext.case_list = c;
4561 if (gfc_match_char ('(') != MATCH_YES)
4566 if (match_case_selector (&c) == MATCH_ERROR)
4576 if (gfc_match_char (')') == MATCH_YES)
4578 if (gfc_match_char (',') != MATCH_YES)
4582 m = match_case_eos ();
4585 if (m == MATCH_ERROR)
4588 new_st.op = EXEC_SELECT;
4589 new_st.ext.case_list = head;
4594 gfc_error ("Syntax error in CASE specification at %C");
4597 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4602 /* Match a TYPE IS statement. */
4605 gfc_match_type_is (void)
4610 if (gfc_current_state () != COMP_SELECT_TYPE)
4612 gfc_error ("Unexpected TYPE IS statement at %C");
4616 if (gfc_match_char ('(') != MATCH_YES)
4619 c = gfc_get_case ();
4620 c->where = gfc_current_locus;
4622 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4623 match_type_spec here. */
4624 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4627 if (gfc_match_char (')') != MATCH_YES)
4630 m = match_case_eos ();
4633 if (m == MATCH_ERROR)
4636 new_st.op = EXEC_SELECT_TYPE;
4637 new_st.ext.case_list = c;
4639 /* Create temporary variable. */
4640 select_type_set_tmp (&c->ts);
4645 gfc_error ("Syntax error in TYPE IS specification at %C");
4649 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4654 /* Match a CLASS IS or CLASS DEFAULT statement. */
4657 gfc_match_class_is (void)
4662 if (gfc_current_state () != COMP_SELECT_TYPE)
4665 if (gfc_match ("% default") == MATCH_YES)
4667 m = match_case_eos ();
4670 if (m == MATCH_ERROR)
4673 new_st.op = EXEC_SELECT_TYPE;
4674 c = gfc_get_case ();
4675 c->where = gfc_current_locus;
4676 c->ts.type = BT_UNKNOWN;
4677 new_st.ext.case_list = c;
4681 m = gfc_match ("% is");
4684 if (m == MATCH_ERROR)
4687 if (gfc_match_char ('(') != MATCH_YES)
4690 c = gfc_get_case ();
4691 c->where = gfc_current_locus;
4693 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4696 if (c->ts.type == BT_DERIVED)
4697 c->ts.type = BT_CLASS;
4699 if (gfc_match_char (')') != MATCH_YES)
4702 m = match_case_eos ();
4705 if (m == MATCH_ERROR)
4708 new_st.op = EXEC_SELECT_TYPE;
4709 new_st.ext.case_list = c;
4711 /* Create temporary variable. */
4712 select_type_set_tmp (&c->ts);
4717 gfc_error ("Syntax error in CLASS IS specification at %C");
4721 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4726 /********************* WHERE subroutines ********************/
4728 /* Match the rest of a simple WHERE statement that follows an IF statement.
4732 match_simple_where (void)
4738 m = gfc_match (" ( %e )", &expr);
4742 m = gfc_match_assignment ();
4745 if (m == MATCH_ERROR)
4748 if (gfc_match_eos () != MATCH_YES)
4751 c = gfc_get_code ();
4755 c->next = gfc_get_code ();
4758 gfc_clear_new_st ();
4760 new_st.op = EXEC_WHERE;
4766 gfc_syntax_error (ST_WHERE);
4769 gfc_free_expr (expr);
4774 /* Match a WHERE statement. */
4777 gfc_match_where (gfc_statement *st)
4783 m0 = gfc_match_label ();
4784 if (m0 == MATCH_ERROR)
4787 m = gfc_match (" where ( %e )", &expr);
4791 if (gfc_match_eos () == MATCH_YES)
4793 *st = ST_WHERE_BLOCK;
4794 new_st.op = EXEC_WHERE;
4795 new_st.expr1 = expr;
4799 m = gfc_match_assignment ();
4801 gfc_syntax_error (ST_WHERE);
4805 gfc_free_expr (expr);
4809 /* We've got a simple WHERE statement. */
4811 c = gfc_get_code ();
4815 c->next = gfc_get_code ();
4818 gfc_clear_new_st ();
4820 new_st.op = EXEC_WHERE;
4827 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4828 new_st if successful. */
4831 gfc_match_elsewhere (void)
4833 char name[GFC_MAX_SYMBOL_LEN + 1];
4837 if (gfc_current_state () != COMP_WHERE)
4839 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4845 if (gfc_match_char ('(') == MATCH_YES)
4847 m = gfc_match_expr (&expr);
4850 if (m == MATCH_ERROR)
4853 if (gfc_match_char (')') != MATCH_YES)
4857 if (gfc_match_eos () != MATCH_YES)
4859 /* Only makes sense if we have a where-construct-name. */
4860 if (!gfc_current_block ())
4865 /* Better be a name at this point. */
4866 m = gfc_match_name (name);
4869 if (m == MATCH_ERROR)
4872 if (gfc_match_eos () != MATCH_YES)
4875 if (strcmp (name, gfc_current_block ()->name) != 0)
4877 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4878 name, gfc_current_block ()->name);
4883 new_st.op = EXEC_WHERE;
4884 new_st.expr1 = expr;
4888 gfc_syntax_error (ST_ELSEWHERE);
4891 gfc_free_expr (expr);
4896 /******************** FORALL subroutines ********************/
4898 /* Free a list of FORALL iterators. */
4901 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4903 gfc_forall_iterator *next;
4908 gfc_free_expr (iter->var);
4909 gfc_free_expr (iter->start);
4910 gfc_free_expr (iter->end);
4911 gfc_free_expr (iter->stride);
4918 /* Match an iterator as part of a FORALL statement. The format is:
4920 <var> = <start>:<end>[:<stride>]
4922 On MATCH_NO, the caller tests for the possibility that there is a
4923 scalar mask expression. */
4926 match_forall_iterator (gfc_forall_iterator **result)
4928 gfc_forall_iterator *iter;
4932 where = gfc_current_locus;
4933 iter = XCNEW (gfc_forall_iterator);
4935 m = gfc_match_expr (&iter->var);
4939 if (gfc_match_char ('=') != MATCH_YES
4940 || iter->var->expr_type != EXPR_VARIABLE)
4946 m = gfc_match_expr (&iter->start);
4950 if (gfc_match_char (':') != MATCH_YES)
4953 m = gfc_match_expr (&iter->end);
4956 if (m == MATCH_ERROR)
4959 if (gfc_match_char (':') == MATCH_NO)
4960 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4963 m = gfc_match_expr (&iter->stride);
4966 if (m == MATCH_ERROR)
4970 /* Mark the iteration variable's symbol as used as a FORALL index. */
4971 iter->var->symtree->n.sym->forall_index = true;
4977 gfc_error ("Syntax error in FORALL iterator at %C");
4982 gfc_current_locus = where;
4983 gfc_free_forall_iterator (iter);
4988 /* Match the header of a FORALL statement. */
4991 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
4993 gfc_forall_iterator *head, *tail, *new_iter;
4997 gfc_gobble_whitespace ();
5002 if (gfc_match_char ('(') != MATCH_YES)
5005 m = match_forall_iterator (&new_iter);
5006 if (m == MATCH_ERROR)
5011 head = tail = new_iter;
5015 if (gfc_match_char (',') != MATCH_YES)
5018 m = match_forall_iterator (&new_iter);
5019 if (m == MATCH_ERROR)
5024 tail->next = new_iter;
5029 /* Have to have a mask expression. */
5031 m = gfc_match_expr (&msk);
5034 if (m == MATCH_ERROR)
5040 if (gfc_match_char (')') == MATCH_NO)
5048 gfc_syntax_error (ST_FORALL);
5051 gfc_free_expr (msk);
5052 gfc_free_forall_iterator (head);
5057 /* Match the rest of a simple FORALL statement that follows an
5061 match_simple_forall (void)
5063 gfc_forall_iterator *head;
5072 m = match_forall_header (&head, &mask);
5079 m = gfc_match_assignment ();
5081 if (m == MATCH_ERROR)
5085 m = gfc_match_pointer_assignment ();
5086 if (m == MATCH_ERROR)
5092 c = gfc_get_code ();
5094 c->loc = gfc_current_locus;
5096 if (gfc_match_eos () != MATCH_YES)
5099 gfc_clear_new_st ();
5100 new_st.op = EXEC_FORALL;
5101 new_st.expr1 = mask;
5102 new_st.ext.forall_iterator = head;
5103 new_st.block = gfc_get_code ();
5105 new_st.block->op = EXEC_FORALL;
5106 new_st.block->next = c;
5111 gfc_syntax_error (ST_FORALL);
5114 gfc_free_forall_iterator (head);
5115 gfc_free_expr (mask);
5121 /* Match a FORALL statement. */
5124 gfc_match_forall (gfc_statement *st)
5126 gfc_forall_iterator *head;
5135 m0 = gfc_match_label ();
5136 if (m0 == MATCH_ERROR)
5139 m = gfc_match (" forall");
5143 m = match_forall_header (&head, &mask);
5144 if (m == MATCH_ERROR)
5149 if (gfc_match_eos () == MATCH_YES)
5151 *st = ST_FORALL_BLOCK;
5152 new_st.op = EXEC_FORALL;
5153 new_st.expr1 = mask;
5154 new_st.ext.forall_iterator = head;
5158 m = gfc_match_assignment ();
5159 if (m == MATCH_ERROR)
5163 m = gfc_match_pointer_assignment ();
5164 if (m == MATCH_ERROR)
5170 c = gfc_get_code ();
5172 c->loc = gfc_current_locus;
5174 gfc_clear_new_st ();
5175 new_st.op = EXEC_FORALL;
5176 new_st.expr1 = mask;
5177 new_st.ext.forall_iterator = head;
5178 new_st.block = gfc_get_code ();
5179 new_st.block->op = EXEC_FORALL;
5180 new_st.block->next = c;
5186 gfc_syntax_error (ST_FORALL);
5189 gfc_free_forall_iterator (head);
5190 gfc_free_expr (mask);
5191 gfc_free_statements (c);