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_expr (&e);
2017 if (m == MATCH_ERROR)
2023 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",
2048 if (e->ts.type == BT_CHARACTER
2049 && e->ts.kind != gfc_default_character_kind)
2051 gfc_error ("STOP code at %L must be default character KIND=%d",
2052 &e->where, (int) gfc_default_character_kind);
2056 if (e->expr_type != EXPR_CONSTANT)
2058 gfc_error ("STOP code at %L must be a constant expression",
2067 new_st.op = EXEC_STOP;
2070 new_st.op = EXEC_ERROR_STOP;
2073 new_st.op = EXEC_PAUSE;
2080 new_st.ext.stop_code = -1;
2085 gfc_syntax_error (st);
2094 /* Match the (deprecated) PAUSE statement. */
2097 gfc_match_pause (void)
2101 m = gfc_match_stopcode (ST_PAUSE);
2104 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2113 /* Match the STOP statement. */
2116 gfc_match_stop (void)
2118 return gfc_match_stopcode (ST_STOP);
2122 /* Match the ERROR STOP statement. */
2125 gfc_match_error_stop (void)
2127 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2131 return gfc_match_stopcode (ST_ERROR_STOP);
2135 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2136 SYNC ALL [(sync-stat-list)]
2137 SYNC MEMORY [(sync-stat-list)]
2138 SYNC IMAGES (image-set [, sync-stat-list] )
2139 with sync-stat is int-expr or *. */
2142 sync_statement (gfc_statement st)
2145 gfc_expr *tmp, *imageset, *stat, *errmsg;
2146 bool saw_stat, saw_errmsg;
2148 tmp = imageset = stat = errmsg = NULL;
2149 saw_stat = saw_errmsg = false;
2151 if (gfc_pure (NULL))
2153 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2157 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2161 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2163 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2167 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2169 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2173 if (gfc_match_eos () == MATCH_YES)
2175 if (st == ST_SYNC_IMAGES)
2180 if (gfc_match_char ('(') != MATCH_YES)
2183 if (st == ST_SYNC_IMAGES)
2185 /* Denote '*' as imageset == NULL. */
2186 m = gfc_match_char ('*');
2187 if (m == MATCH_ERROR)
2191 if (gfc_match ("%e", &imageset) != MATCH_YES)
2194 m = gfc_match_char (',');
2195 if (m == MATCH_ERROR)
2199 m = gfc_match_char (')');
2208 m = gfc_match (" stat = %v", &tmp);
2209 if (m == MATCH_ERROR)
2215 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2221 if (gfc_match_char (',') == MATCH_YES)
2225 m = gfc_match (" errmsg = %v", &tmp);
2226 if (m == MATCH_ERROR)
2232 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2238 if (gfc_match_char (',') == MATCH_YES)
2242 gfc_gobble_whitespace ();
2244 if (gfc_peek_char () == ')')
2250 if (gfc_match (" )%t") != MATCH_YES)
2257 new_st.op = EXEC_SYNC_ALL;
2259 case ST_SYNC_IMAGES:
2260 new_st.op = EXEC_SYNC_IMAGES;
2262 case ST_SYNC_MEMORY:
2263 new_st.op = EXEC_SYNC_MEMORY;
2269 new_st.expr1 = imageset;
2270 new_st.expr2 = stat;
2271 new_st.expr3 = errmsg;
2276 gfc_syntax_error (st);
2279 gfc_free_expr (tmp);
2280 gfc_free_expr (imageset);
2281 gfc_free_expr (stat);
2282 gfc_free_expr (errmsg);
2288 /* Match SYNC ALL statement. */
2291 gfc_match_sync_all (void)
2293 return sync_statement (ST_SYNC_ALL);
2297 /* Match SYNC IMAGES statement. */
2300 gfc_match_sync_images (void)
2302 return sync_statement (ST_SYNC_IMAGES);
2306 /* Match SYNC MEMORY statement. */
2309 gfc_match_sync_memory (void)
2311 return sync_statement (ST_SYNC_MEMORY);
2315 /* Match a CONTINUE statement. */
2318 gfc_match_continue (void)
2320 if (gfc_match_eos () != MATCH_YES)
2322 gfc_syntax_error (ST_CONTINUE);
2326 new_st.op = EXEC_CONTINUE;
2331 /* Match the (deprecated) ASSIGN statement. */
2334 gfc_match_assign (void)
2337 gfc_st_label *label;
2339 if (gfc_match (" %l", &label) == MATCH_YES)
2341 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2343 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2345 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2350 expr->symtree->n.sym->attr.assign = 1;
2352 new_st.op = EXEC_LABEL_ASSIGN;
2353 new_st.label1 = label;
2354 new_st.expr1 = expr;
2362 /* Match the GO TO statement. As a computed GOTO statement is
2363 matched, it is transformed into an equivalent SELECT block. No
2364 tree is necessary, and the resulting jumps-to-jumps are
2365 specifically optimized away by the back end. */
2368 gfc_match_goto (void)
2370 gfc_code *head, *tail;
2373 gfc_st_label *label;
2377 if (gfc_match (" %l%t", &label) == MATCH_YES)
2379 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2382 new_st.op = EXEC_GOTO;
2383 new_st.label1 = label;
2387 /* The assigned GO TO statement. */
2389 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2391 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2396 new_st.op = EXEC_GOTO;
2397 new_st.expr1 = expr;
2399 if (gfc_match_eos () == MATCH_YES)
2402 /* Match label list. */
2403 gfc_match_char (',');
2404 if (gfc_match_char ('(') != MATCH_YES)
2406 gfc_syntax_error (ST_GOTO);
2413 m = gfc_match_st_label (&label);
2417 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2421 head = tail = gfc_get_code ();
2424 tail->block = gfc_get_code ();
2428 tail->label1 = label;
2429 tail->op = EXEC_GOTO;
2431 while (gfc_match_char (',') == MATCH_YES);
2433 if (gfc_match (")%t") != MATCH_YES)
2438 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2441 new_st.block = head;
2446 /* Last chance is a computed GO TO statement. */
2447 if (gfc_match_char ('(') != MATCH_YES)
2449 gfc_syntax_error (ST_GOTO);
2458 m = gfc_match_st_label (&label);
2462 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2466 head = tail = gfc_get_code ();
2469 tail->block = gfc_get_code ();
2473 cp = gfc_get_case ();
2474 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2477 tail->op = EXEC_SELECT;
2478 tail->ext.case_list = cp;
2480 tail->next = gfc_get_code ();
2481 tail->next->op = EXEC_GOTO;
2482 tail->next->label1 = label;
2484 while (gfc_match_char (',') == MATCH_YES);
2486 if (gfc_match_char (')') != MATCH_YES)
2491 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2495 /* Get the rest of the statement. */
2496 gfc_match_char (',');
2498 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2501 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2502 "at %C") == FAILURE)
2505 /* At this point, a computed GOTO has been fully matched and an
2506 equivalent SELECT statement constructed. */
2508 new_st.op = EXEC_SELECT;
2509 new_st.expr1 = NULL;
2511 /* Hack: For a "real" SELECT, the expression is in expr. We put
2512 it in expr2 so we can distinguish then and produce the correct
2514 new_st.expr2 = expr;
2515 new_st.block = head;
2519 gfc_syntax_error (ST_GOTO);
2521 gfc_free_statements (head);
2526 /* Frees a list of gfc_alloc structures. */
2529 gfc_free_alloc_list (gfc_alloc *p)
2536 gfc_free_expr (p->expr);
2542 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2543 an accessible derived type. */
2546 match_derived_type_spec (gfc_typespec *ts)
2549 gfc_symbol *derived;
2551 old_locus = gfc_current_locus;
2553 if (gfc_match_symbol (&derived, 1) == MATCH_YES)
2555 if (derived->attr.flavor == FL_DERIVED)
2557 ts->type = BT_DERIVED;
2558 ts->u.derived = derived;
2563 /* Enforce F03:C476. */
2564 gfc_error ("'%s' at %L is not an accessible derived type",
2565 derived->name, &gfc_current_locus);
2570 gfc_current_locus = old_locus;
2575 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2576 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2577 It only includes the intrinsic types from the Fortran 2003 standard
2578 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2579 the implicit_flag is not needed, so it was removed. Derived types are
2580 identified by their name alone. */
2583 match_type_spec (gfc_typespec *ts)
2589 old_locus = gfc_current_locus;
2591 if (gfc_match ("integer") == MATCH_YES)
2593 ts->type = BT_INTEGER;
2594 ts->kind = gfc_default_integer_kind;
2598 if (gfc_match ("real") == MATCH_YES)
2601 ts->kind = gfc_default_real_kind;
2605 if (gfc_match ("double precision") == MATCH_YES)
2608 ts->kind = gfc_default_double_kind;
2612 if (gfc_match ("complex") == MATCH_YES)
2614 ts->type = BT_COMPLEX;
2615 ts->kind = gfc_default_complex_kind;
2619 if (gfc_match ("character") == MATCH_YES)
2621 ts->type = BT_CHARACTER;
2625 if (gfc_match ("logical") == MATCH_YES)
2627 ts->type = BT_LOGICAL;
2628 ts->kind = gfc_default_logical_kind;
2632 m = match_derived_type_spec (ts);
2635 old_locus = gfc_current_locus;
2636 if (gfc_match (" :: ") != MATCH_YES)
2638 gfc_current_locus = old_locus;
2639 /* Enfore F03:C401. */
2640 if (ts->u.derived->attr.abstract)
2642 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2643 ts->u.derived->name, &old_locus);
2648 else if (m == MATCH_ERROR && gfc_match (" :: ") == MATCH_YES)
2651 /* If a type is not matched, simply return MATCH_NO. */
2652 gfc_current_locus = old_locus;
2657 gfc_gobble_whitespace ();
2658 if (gfc_peek_ascii_char () == '*')
2660 gfc_error ("Invalid type-spec at %C");
2664 m = gfc_match_kind_spec (ts, false);
2667 m = MATCH_YES; /* No kind specifier found. */
2673 m = gfc_match_char_spec (ts);
2676 m = MATCH_YES; /* No kind specifier found. */
2682 /* Match an ALLOCATE statement. */
2685 gfc_match_allocate (void)
2687 gfc_alloc *head, *tail;
2688 gfc_expr *stat, *errmsg, *tmp, *source;
2693 bool saw_stat, saw_errmsg, saw_source, b1, b2, b3;
2696 stat = errmsg = source = tmp = NULL;
2697 saw_stat = saw_errmsg = saw_source = false;
2699 if (gfc_match_char ('(') != MATCH_YES)
2702 /* Match an optional type-spec. */
2703 old_locus = gfc_current_locus;
2704 m = match_type_spec (&ts);
2705 if (m == MATCH_ERROR)
2707 else if (m == MATCH_NO)
2708 ts.type = BT_UNKNOWN;
2711 if (gfc_match (" :: ") == MATCH_YES)
2713 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2714 "ALLOCATE at %L", &old_locus) == FAILURE)
2719 ts.type = BT_UNKNOWN;
2720 gfc_current_locus = old_locus;
2727 head = tail = gfc_get_alloc ();
2730 tail->next = gfc_get_alloc ();
2734 m = gfc_match_variable (&tail->expr, 0);
2737 if (m == MATCH_ERROR)
2740 if (gfc_check_do_variable (tail->expr->symtree))
2743 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2745 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2749 /* The ALLOCATE statement had an optional typespec. Check the
2751 if (ts.type != BT_UNKNOWN)
2753 /* Enforce F03:C624. */
2754 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2756 gfc_error ("Type of entity at %L is type incompatible with "
2757 "typespec", &tail->expr->where);
2761 /* Enforce F03:C627. */
2762 if (ts.kind != tail->expr->ts.kind)
2764 gfc_error ("Kind type parameter for entity at %L differs from "
2765 "the kind type parameter of the typespec",
2766 &tail->expr->where);
2771 if (tail->expr->ts.type == BT_DERIVED)
2772 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2774 /* FIXME: disable the checking on derived types and arrays. */
2775 sym = tail->expr->symtree->n.sym;
2776 b1 = !(tail->expr->ref
2777 && (tail->expr->ref->type == REF_COMPONENT
2778 || tail->expr->ref->type == REF_ARRAY));
2779 if (sym && sym->ts.type == BT_CLASS)
2780 b2 = !(sym->ts.u.derived->components->attr.allocatable
2781 || sym->ts.u.derived->components->attr.pointer);
2783 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2784 || sym->attr.proc_pointer);
2785 b3 = sym && sym->ns && sym->ns->proc_name
2786 && (sym->ns->proc_name->attr.allocatable
2787 || sym->ns->proc_name->attr.pointer
2788 || sym->ns->proc_name->attr.proc_pointer);
2789 if (b1 && b2 && !b3)
2791 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2792 "or an allocatable variable");
2796 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2798 gfc_error ("Shape specification for allocatable scalar at %C");
2802 if (gfc_match_char (',') != MATCH_YES)
2807 m = gfc_match (" stat = %v", &tmp);
2808 if (m == MATCH_ERROR)
2815 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2822 if (gfc_check_do_variable (stat->symtree))
2825 if (gfc_match_char (',') == MATCH_YES)
2826 goto alloc_opt_list;
2829 m = gfc_match (" errmsg = %v", &tmp);
2830 if (m == MATCH_ERROR)
2834 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
2835 &tmp->where) == FAILURE)
2841 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2848 if (gfc_match_char (',') == MATCH_YES)
2849 goto alloc_opt_list;
2852 m = gfc_match (" source = %e", &tmp);
2853 if (m == MATCH_ERROR)
2857 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
2858 &tmp->where) == FAILURE)
2864 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
2868 /* The next 2 conditionals check C631. */
2869 if (ts.type != BT_UNKNOWN)
2871 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
2872 &tmp->where, &old_locus);
2878 gfc_error ("SOURCE tag at %L requires only a single entity in "
2879 "the allocation-list", &tmp->where);
2886 if (gfc_match_char (',') == MATCH_YES)
2887 goto alloc_opt_list;
2890 gfc_gobble_whitespace ();
2892 if (gfc_peek_char () == ')')
2897 if (gfc_match (" )%t") != MATCH_YES)
2900 new_st.op = EXEC_ALLOCATE;
2901 new_st.expr1 = stat;
2902 new_st.expr2 = errmsg;
2903 new_st.expr3 = source;
2904 new_st.ext.alloc.list = head;
2905 new_st.ext.alloc.ts = ts;
2910 gfc_syntax_error (ST_ALLOCATE);
2913 gfc_free_expr (errmsg);
2914 gfc_free_expr (source);
2915 gfc_free_expr (stat);
2916 gfc_free_expr (tmp);
2917 gfc_free_alloc_list (head);
2922 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
2923 a set of pointer assignments to intrinsic NULL(). */
2926 gfc_match_nullify (void)
2934 if (gfc_match_char ('(') != MATCH_YES)
2939 m = gfc_match_variable (&p, 0);
2940 if (m == MATCH_ERROR)
2945 if (gfc_check_do_variable (p->symtree))
2948 if (gfc_pure (NULL) && gfc_impure_variable (p->symtree->n.sym))
2950 gfc_error ("Illegal variable in NULLIFY at %C for a PURE procedure");
2954 /* build ' => NULL() '. */
2955 e = gfc_get_null_expr (&gfc_current_locus);
2957 /* Chain to list. */
2962 tail->next = gfc_get_code ();
2966 tail->op = EXEC_POINTER_ASSIGN;
2970 if (gfc_match (" )%t") == MATCH_YES)
2972 if (gfc_match_char (',') != MATCH_YES)
2979 gfc_syntax_error (ST_NULLIFY);
2982 gfc_free_statements (new_st.next);
2984 gfc_free_expr (new_st.expr1);
2985 new_st.expr1 = NULL;
2986 gfc_free_expr (new_st.expr2);
2987 new_st.expr2 = NULL;
2992 /* Match a DEALLOCATE statement. */
2995 gfc_match_deallocate (void)
2997 gfc_alloc *head, *tail;
2998 gfc_expr *stat, *errmsg, *tmp;
3001 bool saw_stat, saw_errmsg, b1, b2;
3004 stat = errmsg = tmp = NULL;
3005 saw_stat = saw_errmsg = false;
3007 if (gfc_match_char ('(') != MATCH_YES)
3013 head = tail = gfc_get_alloc ();
3016 tail->next = gfc_get_alloc ();
3020 m = gfc_match_variable (&tail->expr, 0);
3021 if (m == MATCH_ERROR)
3026 if (gfc_check_do_variable (tail->expr->symtree))
3029 sym = tail->expr->symtree->n.sym;
3031 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3033 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3037 /* FIXME: disable the checking on derived types. */
3038 b1 = !(tail->expr->ref
3039 && (tail->expr->ref->type == REF_COMPONENT
3040 || tail->expr->ref->type == REF_ARRAY));
3041 if (sym && sym->ts.type == BT_CLASS)
3042 b2 = !(sym->ts.u.derived->components->attr.allocatable
3043 || sym->ts.u.derived->components->attr.pointer);
3045 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3046 || sym->attr.proc_pointer);
3049 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3050 "or an allocatable variable");
3054 if (gfc_match_char (',') != MATCH_YES)
3059 m = gfc_match (" stat = %v", &tmp);
3060 if (m == MATCH_ERROR)
3066 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3067 gfc_free_expr (tmp);
3074 if (gfc_check_do_variable (stat->symtree))
3077 if (gfc_match_char (',') == MATCH_YES)
3078 goto dealloc_opt_list;
3081 m = gfc_match (" errmsg = %v", &tmp);
3082 if (m == MATCH_ERROR)
3086 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3087 &tmp->where) == FAILURE)
3092 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3093 gfc_free_expr (tmp);
3100 if (gfc_match_char (',') == MATCH_YES)
3101 goto dealloc_opt_list;
3104 gfc_gobble_whitespace ();
3106 if (gfc_peek_char () == ')')
3110 if (gfc_match (" )%t") != MATCH_YES)
3113 new_st.op = EXEC_DEALLOCATE;
3114 new_st.expr1 = stat;
3115 new_st.expr2 = errmsg;
3116 new_st.ext.alloc.list = head;
3121 gfc_syntax_error (ST_DEALLOCATE);
3124 gfc_free_expr (errmsg);
3125 gfc_free_expr (stat);
3126 gfc_free_alloc_list (head);
3131 /* Match a RETURN statement. */
3134 gfc_match_return (void)
3138 gfc_compile_state s;
3142 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3144 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3148 if (gfc_match_eos () == MATCH_YES)
3151 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3153 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3158 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3159 "at %C") == FAILURE)
3162 if (gfc_current_form == FORM_FREE)
3164 /* The following are valid, so we can't require a blank after the
3168 char c = gfc_peek_ascii_char ();
3169 if (ISALPHA (c) || ISDIGIT (c))
3173 m = gfc_match (" %e%t", &e);
3176 if (m == MATCH_ERROR)
3179 gfc_syntax_error (ST_RETURN);
3186 gfc_enclosing_unit (&s);
3187 if (s == COMP_PROGRAM
3188 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3189 "main program at %C") == FAILURE)
3192 new_st.op = EXEC_RETURN;
3199 /* Match the call of a type-bound procedure, if CALL%var has already been
3200 matched and var found to be a derived-type variable. */
3203 match_typebound_call (gfc_symtree* varst)
3208 base = gfc_get_expr ();
3209 base->expr_type = EXPR_VARIABLE;
3210 base->symtree = varst;
3211 base->where = gfc_current_locus;
3212 gfc_set_sym_referenced (varst->n.sym);
3214 m = gfc_match_varspec (base, 0, true, true);
3216 gfc_error ("Expected component reference at %C");
3220 if (gfc_match_eos () != MATCH_YES)
3222 gfc_error ("Junk after CALL at %C");
3226 if (base->expr_type == EXPR_COMPCALL)
3227 new_st.op = EXEC_COMPCALL;
3228 else if (base->expr_type == EXPR_PPC)
3229 new_st.op = EXEC_CALL_PPC;
3232 gfc_error ("Expected type-bound procedure or procedure pointer component "
3236 new_st.expr1 = base;
3242 /* Match a CALL statement. The tricky part here are possible
3243 alternate return specifiers. We handle these by having all
3244 "subroutines" actually return an integer via a register that gives
3245 the return number. If the call specifies alternate returns, we
3246 generate code for a SELECT statement whose case clauses contain
3247 GOTOs to the various labels. */
3250 gfc_match_call (void)
3252 char name[GFC_MAX_SYMBOL_LEN + 1];
3253 gfc_actual_arglist *a, *arglist;
3263 m = gfc_match ("% %n", name);
3269 if (gfc_get_ha_sym_tree (name, &st))
3274 /* If this is a variable of derived-type, it probably starts a type-bound
3276 if ((sym->attr.flavor != FL_PROCEDURE
3277 || gfc_is_function_return_value (sym, gfc_current_ns))
3278 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3279 return match_typebound_call (st);
3281 /* If it does not seem to be callable (include functions so that the
3282 right association is made. They are thrown out in resolution.)
3284 if (!sym->attr.generic
3285 && !sym->attr.subroutine
3286 && !sym->attr.function)
3288 if (!(sym->attr.external && !sym->attr.referenced))
3290 /* ...create a symbol in this scope... */
3291 if (sym->ns != gfc_current_ns
3292 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3295 if (sym != st->n.sym)
3299 /* ...and then to try to make the symbol into a subroutine. */
3300 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3304 gfc_set_sym_referenced (sym);
3306 if (gfc_match_eos () != MATCH_YES)
3308 m = gfc_match_actual_arglist (1, &arglist);
3311 if (m == MATCH_ERROR)
3314 if (gfc_match_eos () != MATCH_YES)
3318 /* If any alternate return labels were found, construct a SELECT
3319 statement that will jump to the right place. */
3322 for (a = arglist; a; a = a->next)
3323 if (a->expr == NULL)
3328 gfc_symtree *select_st;
3329 gfc_symbol *select_sym;
3330 char name[GFC_MAX_SYMBOL_LEN + 1];
3332 new_st.next = c = gfc_get_code ();
3333 c->op = EXEC_SELECT;
3334 sprintf (name, "_result_%s", sym->name);
3335 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3337 select_sym = select_st->n.sym;
3338 select_sym->ts.type = BT_INTEGER;
3339 select_sym->ts.kind = gfc_default_integer_kind;
3340 gfc_set_sym_referenced (select_sym);
3341 c->expr1 = gfc_get_expr ();
3342 c->expr1->expr_type = EXPR_VARIABLE;
3343 c->expr1->symtree = select_st;
3344 c->expr1->ts = select_sym->ts;
3345 c->expr1->where = gfc_current_locus;
3348 for (a = arglist; a; a = a->next)
3350 if (a->expr != NULL)
3353 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3358 c->block = gfc_get_code ();
3360 c->op = EXEC_SELECT;
3362 new_case = gfc_get_case ();
3363 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3364 new_case->low = new_case->high;
3365 c->ext.case_list = new_case;
3367 c->next = gfc_get_code ();
3368 c->next->op = EXEC_GOTO;
3369 c->next->label1 = a->label;
3373 new_st.op = EXEC_CALL;
3374 new_st.symtree = st;
3375 new_st.ext.actual = arglist;
3380 gfc_syntax_error (ST_CALL);
3383 gfc_free_actual_arglist (arglist);
3388 /* Given a name, return a pointer to the common head structure,
3389 creating it if it does not exist. If FROM_MODULE is nonzero, we
3390 mangle the name so that it doesn't interfere with commons defined
3391 in the using namespace.
3392 TODO: Add to global symbol tree. */
3395 gfc_get_common (const char *name, int from_module)
3398 static int serial = 0;
3399 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3403 /* A use associated common block is only needed to correctly layout
3404 the variables it contains. */
3405 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3406 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3410 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3413 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3416 if (st->n.common == NULL)
3418 st->n.common = gfc_get_common_head ();
3419 st->n.common->where = gfc_current_locus;
3420 strcpy (st->n.common->name, name);
3423 return st->n.common;
3427 /* Match a common block name. */
3429 match match_common_name (char *name)
3433 if (gfc_match_char ('/') == MATCH_NO)
3439 if (gfc_match_char ('/') == MATCH_YES)
3445 m = gfc_match_name (name);
3447 if (m == MATCH_ERROR)
3449 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3452 gfc_error ("Syntax error in common block name at %C");
3457 /* Match a COMMON statement. */
3460 gfc_match_common (void)
3462 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3463 char name[GFC_MAX_SYMBOL_LEN + 1];
3470 old_blank_common = gfc_current_ns->blank_common.head;
3471 if (old_blank_common)
3473 while (old_blank_common->common_next)
3474 old_blank_common = old_blank_common->common_next;
3481 m = match_common_name (name);
3482 if (m == MATCH_ERROR)
3485 gsym = gfc_get_gsymbol (name);
3486 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3488 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3489 "is not COMMON", name);
3493 if (gsym->type == GSYM_UNKNOWN)
3495 gsym->type = GSYM_COMMON;
3496 gsym->where = gfc_current_locus;
3502 if (name[0] == '\0')
3504 t = &gfc_current_ns->blank_common;
3505 if (t->head == NULL)
3506 t->where = gfc_current_locus;
3510 t = gfc_get_common (name, 0);
3519 while (tail->common_next)
3520 tail = tail->common_next;
3523 /* Grab the list of symbols. */
3526 m = gfc_match_symbol (&sym, 0);
3527 if (m == MATCH_ERROR)
3532 /* Store a ref to the common block for error checking. */
3533 sym->common_block = t;
3535 /* See if we know the current common block is bind(c), and if
3536 so, then see if we can check if the symbol is (which it'll
3537 need to be). This can happen if the bind(c) attr stmt was
3538 applied to the common block, and the variable(s) already
3539 defined, before declaring the common block. */
3540 if (t->is_bind_c == 1)
3542 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3544 /* If we find an error, just print it and continue,
3545 cause it's just semantic, and we can see if there
3547 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3548 "at %C must be declared with a C "
3549 "interoperable kind since common block "
3551 sym->name, &(sym->declared_at), t->name,
3555 if (sym->attr.is_bind_c == 1)
3556 gfc_error_now ("Variable '%s' in common block "
3557 "'%s' at %C can not be bind(c) since "
3558 "it is not global", sym->name, t->name);
3561 if (sym->attr.in_common)
3563 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3568 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3569 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3571 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3572 "can only be COMMON in "
3573 "BLOCK DATA", sym->name)
3578 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3582 tail->common_next = sym;
3588 /* Deal with an optional array specification after the
3590 m = gfc_match_array_spec (&as, true, true);
3591 if (m == MATCH_ERROR)
3596 if (as->type != AS_EXPLICIT)
3598 gfc_error ("Array specification for symbol '%s' in COMMON "
3599 "at %C must be explicit", sym->name);
3603 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3606 if (sym->attr.pointer)
3608 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3609 "POINTER array", sym->name);
3618 sym->common_head = t;
3620 /* Check to see if the symbol is already in an equivalence group.
3621 If it is, set the other members as being in common. */
3622 if (sym->attr.in_equivalence)
3624 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3626 for (e2 = e1; e2; e2 = e2->eq)
3627 if (e2->expr->symtree->n.sym == sym)
3634 for (e2 = e1; e2; e2 = e2->eq)
3636 other = e2->expr->symtree->n.sym;
3637 if (other->common_head
3638 && other->common_head != sym->common_head)
3640 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3641 "%C is being indirectly equivalenced to "
3642 "another COMMON block '%s'",
3643 sym->name, sym->common_head->name,
3644 other->common_head->name);
3647 other->attr.in_common = 1;
3648 other->common_head = t;
3654 gfc_gobble_whitespace ();
3655 if (gfc_match_eos () == MATCH_YES)
3657 if (gfc_peek_ascii_char () == '/')
3659 if (gfc_match_char (',') != MATCH_YES)
3661 gfc_gobble_whitespace ();
3662 if (gfc_peek_ascii_char () == '/')
3671 gfc_syntax_error (ST_COMMON);
3674 if (old_blank_common)
3675 old_blank_common->common_next = NULL;
3677 gfc_current_ns->blank_common.head = NULL;
3678 gfc_free_array_spec (as);
3683 /* Match a BLOCK DATA program unit. */
3686 gfc_match_block_data (void)
3688 char name[GFC_MAX_SYMBOL_LEN + 1];
3692 if (gfc_match_eos () == MATCH_YES)
3694 gfc_new_block = NULL;
3698 m = gfc_match ("% %n%t", name);
3702 if (gfc_get_symbol (name, NULL, &sym))
3705 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3708 gfc_new_block = sym;
3714 /* Free a namelist structure. */
3717 gfc_free_namelist (gfc_namelist *name)
3721 for (; name; name = n)
3729 /* Match a NAMELIST statement. */
3732 gfc_match_namelist (void)
3734 gfc_symbol *group_name, *sym;
3738 m = gfc_match (" / %s /", &group_name);
3741 if (m == MATCH_ERROR)
3746 if (group_name->ts.type != BT_UNKNOWN)
3748 gfc_error ("Namelist group name '%s' at %C already has a basic "
3749 "type of %s", group_name->name,
3750 gfc_typename (&group_name->ts));
3754 if (group_name->attr.flavor == FL_NAMELIST
3755 && group_name->attr.use_assoc
3756 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3757 "at %C already is USE associated and can"
3758 "not be respecified.", group_name->name)
3762 if (group_name->attr.flavor != FL_NAMELIST
3763 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3764 group_name->name, NULL) == FAILURE)
3769 m = gfc_match_symbol (&sym, 1);
3772 if (m == MATCH_ERROR)
3775 if (sym->attr.in_namelist == 0
3776 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
3779 /* Use gfc_error_check here, rather than goto error, so that
3780 these are the only errors for the next two lines. */
3781 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
3783 gfc_error ("Assumed size array '%s' in namelist '%s' at "
3784 "%C is not allowed", sym->name, group_name->name);
3788 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
3790 gfc_error ("Assumed character length '%s' in namelist '%s' at "
3791 "%C is not allowed", sym->name, group_name->name);
3795 nl = gfc_get_namelist ();
3799 if (group_name->namelist == NULL)
3800 group_name->namelist = group_name->namelist_tail = nl;
3803 group_name->namelist_tail->next = nl;
3804 group_name->namelist_tail = nl;
3807 if (gfc_match_eos () == MATCH_YES)
3810 m = gfc_match_char (',');
3812 if (gfc_match_char ('/') == MATCH_YES)
3814 m2 = gfc_match (" %s /", &group_name);
3815 if (m2 == MATCH_YES)
3817 if (m2 == MATCH_ERROR)
3831 gfc_syntax_error (ST_NAMELIST);
3838 /* Match a MODULE statement. */
3841 gfc_match_module (void)
3845 m = gfc_match (" %s%t", &gfc_new_block);
3849 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
3850 gfc_new_block->name, NULL) == FAILURE)
3857 /* Free equivalence sets and lists. Recursively is the easiest way to
3861 gfc_free_equiv (gfc_equiv *eq)
3866 gfc_free_equiv (eq->eq);
3867 gfc_free_equiv (eq->next);
3868 gfc_free_expr (eq->expr);
3873 /* Match an EQUIVALENCE statement. */
3876 gfc_match_equivalence (void)
3878 gfc_equiv *eq, *set, *tail;
3882 gfc_common_head *common_head = NULL;
3890 eq = gfc_get_equiv ();
3894 eq->next = gfc_current_ns->equiv;
3895 gfc_current_ns->equiv = eq;
3897 if (gfc_match_char ('(') != MATCH_YES)
3901 common_flag = FALSE;
3906 m = gfc_match_equiv_variable (&set->expr);
3907 if (m == MATCH_ERROR)
3912 /* count the number of objects. */
3915 if (gfc_match_char ('%') == MATCH_YES)
3917 gfc_error ("Derived type component %C is not a "
3918 "permitted EQUIVALENCE member");
3922 for (ref = set->expr->ref; ref; ref = ref->next)
3923 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
3925 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
3926 "be an array section");
3930 sym = set->expr->symtree->n.sym;
3932 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
3935 if (sym->attr.in_common)
3938 common_head = sym->common_head;
3941 if (gfc_match_char (')') == MATCH_YES)
3944 if (gfc_match_char (',') != MATCH_YES)
3947 set->eq = gfc_get_equiv ();
3953 gfc_error ("EQUIVALENCE at %C requires two or more objects");
3957 /* If one of the members of an equivalence is in common, then
3958 mark them all as being in common. Before doing this, check
3959 that members of the equivalence group are not in different
3962 for (set = eq; set; set = set->eq)
3964 sym = set->expr->symtree->n.sym;
3965 if (sym->common_head && sym->common_head != common_head)
3967 gfc_error ("Attempt to indirectly overlap COMMON "
3968 "blocks %s and %s by EQUIVALENCE at %C",
3969 sym->common_head->name, common_head->name);
3972 sym->attr.in_common = 1;
3973 sym->common_head = common_head;
3976 if (gfc_match_eos () == MATCH_YES)
3978 if (gfc_match_char (',') != MATCH_YES)
3980 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
3988 gfc_syntax_error (ST_EQUIVALENCE);
3994 gfc_free_equiv (gfc_current_ns->equiv);
3995 gfc_current_ns->equiv = eq;
4001 /* Check that a statement function is not recursive. This is done by looking
4002 for the statement function symbol(sym) by looking recursively through its
4003 expression(e). If a reference to sym is found, true is returned.
4004 12.5.4 requires that any variable of function that is implicitly typed
4005 shall have that type confirmed by any subsequent type declaration. The
4006 implicit typing is conveniently done here. */
4008 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4011 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4017 switch (e->expr_type)
4020 if (e->symtree == NULL)
4023 /* Check the name before testing for nested recursion! */
4024 if (sym->name == e->symtree->n.sym->name)
4027 /* Catch recursion via other statement functions. */
4028 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4029 && e->symtree->n.sym->value
4030 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4033 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4034 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4039 if (e->symtree && sym->name == e->symtree->n.sym->name)
4042 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4043 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4055 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4057 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4061 /* Match a statement function declaration. It is so easy to match
4062 non-statement function statements with a MATCH_ERROR as opposed to
4063 MATCH_NO that we suppress error message in most cases. */
4066 gfc_match_st_function (void)
4068 gfc_error_buf old_error;
4073 m = gfc_match_symbol (&sym, 0);
4077 gfc_push_error (&old_error);
4079 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4080 sym->name, NULL) == FAILURE)
4083 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4086 m = gfc_match (" = %e%t", &expr);
4090 gfc_free_error (&old_error);
4091 if (m == MATCH_ERROR)
4094 if (recursive_stmt_fcn (expr, sym))
4096 gfc_error ("Statement function at %L is recursive", &expr->where);
4102 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4103 "Statement function at %C") == FAILURE)
4109 gfc_pop_error (&old_error);
4114 /***************** SELECT CASE subroutines ******************/
4116 /* Free a single case structure. */
4119 free_case (gfc_case *p)
4121 if (p->low == p->high)
4123 gfc_free_expr (p->low);
4124 gfc_free_expr (p->high);
4129 /* Free a list of case structures. */
4132 gfc_free_case_list (gfc_case *p)
4144 /* Match a single case selector. */
4147 match_case_selector (gfc_case **cp)
4152 c = gfc_get_case ();
4153 c->where = gfc_current_locus;
4155 if (gfc_match_char (':') == MATCH_YES)
4157 m = gfc_match_init_expr (&c->high);
4160 if (m == MATCH_ERROR)
4165 m = gfc_match_init_expr (&c->low);
4166 if (m == MATCH_ERROR)
4171 /* If we're not looking at a ':' now, make a range out of a single
4172 target. Else get the upper bound for the case range. */
4173 if (gfc_match_char (':') != MATCH_YES)
4177 m = gfc_match_init_expr (&c->high);
4178 if (m == MATCH_ERROR)
4180 /* MATCH_NO is fine. It's OK if nothing is there! */
4188 gfc_error ("Expected initialization expression in CASE at %C");
4196 /* Match the end of a case statement. */
4199 match_case_eos (void)
4201 char name[GFC_MAX_SYMBOL_LEN + 1];
4204 if (gfc_match_eos () == MATCH_YES)
4207 /* If the case construct doesn't have a case-construct-name, we
4208 should have matched the EOS. */
4209 if (!gfc_current_block ())
4212 gfc_gobble_whitespace ();
4214 m = gfc_match_name (name);
4218 if (strcmp (name, gfc_current_block ()->name) != 0)
4220 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4221 gfc_current_block ()->name);
4225 return gfc_match_eos ();
4229 /* Match a SELECT statement. */
4232 gfc_match_select (void)
4237 m = gfc_match_label ();
4238 if (m == MATCH_ERROR)
4241 m = gfc_match (" select case ( %e )%t", &expr);
4245 new_st.op = EXEC_SELECT;
4246 new_st.expr1 = expr;
4252 /* Push the current selector onto the SELECT TYPE stack. */
4255 select_type_push (gfc_symbol *sel)
4257 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4258 top->selector = sel;
4260 top->prev = select_type_stack;
4262 select_type_stack = top;
4266 /* Set the temporary for the current SELECT TYPE selector. */
4269 select_type_set_tmp (gfc_typespec *ts)
4271 char name[GFC_MAX_SYMBOL_LEN];
4274 if (!gfc_type_is_extensible (ts->u.derived))
4277 if (ts->type == BT_CLASS)
4278 sprintf (name, "tmp$class$%s", ts->u.derived->name);
4280 sprintf (name, "tmp$type$%s", ts->u.derived->name);
4281 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4282 gfc_add_type (tmp->n.sym, ts, NULL);
4283 gfc_set_sym_referenced (tmp->n.sym);
4284 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4285 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4286 if (ts->type == BT_CLASS)
4288 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4289 &tmp->n.sym->as, false);
4290 tmp->n.sym->attr.class_ok = 1;
4293 select_type_stack->tmp = tmp;
4297 /* Match a SELECT TYPE statement. */
4300 gfc_match_select_type (void)
4302 gfc_expr *expr1, *expr2 = NULL;
4304 char name[GFC_MAX_SYMBOL_LEN];
4306 m = gfc_match_label ();
4307 if (m == MATCH_ERROR)
4310 m = gfc_match (" select type ( ");
4314 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4316 m = gfc_match (" %n => %e", name, &expr2);
4319 expr1 = gfc_get_expr();
4320 expr1->expr_type = EXPR_VARIABLE;
4321 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4323 if (expr2->ts.type == BT_UNKNOWN)
4324 expr1->symtree->n.sym->attr.untyped = 1;
4326 expr1->symtree->n.sym->ts = expr2->ts;
4327 expr1->symtree->n.sym->attr.referenced = 1;
4328 expr1->symtree->n.sym->attr.class_ok = 1;
4332 m = gfc_match (" %e ", &expr1);
4337 m = gfc_match (" )%t");
4341 /* Check for F03:C811. */
4342 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4344 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4345 "use associate-name=>");
4349 new_st.op = EXEC_SELECT_TYPE;
4350 new_st.expr1 = expr1;
4351 new_st.expr2 = expr2;
4352 new_st.ext.ns = gfc_current_ns;
4354 select_type_push (expr1->symtree->n.sym);
4360 /* Match a CASE statement. */
4363 gfc_match_case (void)
4365 gfc_case *c, *head, *tail;
4370 if (gfc_current_state () != COMP_SELECT)
4372 gfc_error ("Unexpected CASE statement at %C");
4376 if (gfc_match ("% default") == MATCH_YES)
4378 m = match_case_eos ();
4381 if (m == MATCH_ERROR)
4384 new_st.op = EXEC_SELECT;
4385 c = gfc_get_case ();
4386 c->where = gfc_current_locus;
4387 new_st.ext.case_list = c;
4391 if (gfc_match_char ('(') != MATCH_YES)
4396 if (match_case_selector (&c) == MATCH_ERROR)
4406 if (gfc_match_char (')') == MATCH_YES)
4408 if (gfc_match_char (',') != MATCH_YES)
4412 m = match_case_eos ();
4415 if (m == MATCH_ERROR)
4418 new_st.op = EXEC_SELECT;
4419 new_st.ext.case_list = head;
4424 gfc_error ("Syntax error in CASE specification at %C");
4427 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4432 /* Match a TYPE IS statement. */
4435 gfc_match_type_is (void)
4440 if (gfc_current_state () != COMP_SELECT_TYPE)
4442 gfc_error ("Unexpected TYPE IS statement at %C");
4446 if (gfc_match_char ('(') != MATCH_YES)
4449 c = gfc_get_case ();
4450 c->where = gfc_current_locus;
4452 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4453 match_type_spec here. */
4454 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4457 if (gfc_match_char (')') != MATCH_YES)
4460 m = match_case_eos ();
4463 if (m == MATCH_ERROR)
4466 new_st.op = EXEC_SELECT_TYPE;
4467 new_st.ext.case_list = c;
4469 /* Create temporary variable. */
4470 select_type_set_tmp (&c->ts);
4475 gfc_error ("Syntax error in TYPE IS specification at %C");
4479 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4484 /* Match a CLASS IS or CLASS DEFAULT statement. */
4487 gfc_match_class_is (void)
4492 if (gfc_current_state () != COMP_SELECT_TYPE)
4495 if (gfc_match ("% default") == MATCH_YES)
4497 m = match_case_eos ();
4500 if (m == MATCH_ERROR)
4503 new_st.op = EXEC_SELECT_TYPE;
4504 c = gfc_get_case ();
4505 c->where = gfc_current_locus;
4506 c->ts.type = BT_UNKNOWN;
4507 new_st.ext.case_list = c;
4511 m = gfc_match ("% is");
4514 if (m == MATCH_ERROR)
4517 if (gfc_match_char ('(') != MATCH_YES)
4520 c = gfc_get_case ();
4521 c->where = gfc_current_locus;
4523 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4526 if (c->ts.type == BT_DERIVED)
4527 c->ts.type = BT_CLASS;
4529 if (gfc_match_char (')') != MATCH_YES)
4532 m = match_case_eos ();
4535 if (m == MATCH_ERROR)
4538 new_st.op = EXEC_SELECT_TYPE;
4539 new_st.ext.case_list = c;
4541 /* Create temporary variable. */
4542 select_type_set_tmp (&c->ts);
4547 gfc_error ("Syntax error in CLASS IS specification at %C");
4551 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4556 /********************* WHERE subroutines ********************/
4558 /* Match the rest of a simple WHERE statement that follows an IF statement.
4562 match_simple_where (void)
4568 m = gfc_match (" ( %e )", &expr);
4572 m = gfc_match_assignment ();
4575 if (m == MATCH_ERROR)
4578 if (gfc_match_eos () != MATCH_YES)
4581 c = gfc_get_code ();
4585 c->next = gfc_get_code ();
4588 gfc_clear_new_st ();
4590 new_st.op = EXEC_WHERE;
4596 gfc_syntax_error (ST_WHERE);
4599 gfc_free_expr (expr);
4604 /* Match a WHERE statement. */
4607 gfc_match_where (gfc_statement *st)
4613 m0 = gfc_match_label ();
4614 if (m0 == MATCH_ERROR)
4617 m = gfc_match (" where ( %e )", &expr);
4621 if (gfc_match_eos () == MATCH_YES)
4623 *st = ST_WHERE_BLOCK;
4624 new_st.op = EXEC_WHERE;
4625 new_st.expr1 = expr;
4629 m = gfc_match_assignment ();
4631 gfc_syntax_error (ST_WHERE);
4635 gfc_free_expr (expr);
4639 /* We've got a simple WHERE statement. */
4641 c = gfc_get_code ();
4645 c->next = gfc_get_code ();
4648 gfc_clear_new_st ();
4650 new_st.op = EXEC_WHERE;
4657 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4658 new_st if successful. */
4661 gfc_match_elsewhere (void)
4663 char name[GFC_MAX_SYMBOL_LEN + 1];
4667 if (gfc_current_state () != COMP_WHERE)
4669 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4675 if (gfc_match_char ('(') == MATCH_YES)
4677 m = gfc_match_expr (&expr);
4680 if (m == MATCH_ERROR)
4683 if (gfc_match_char (')') != MATCH_YES)
4687 if (gfc_match_eos () != MATCH_YES)
4689 /* Only makes sense if we have a where-construct-name. */
4690 if (!gfc_current_block ())
4695 /* Better be a name at this point. */
4696 m = gfc_match_name (name);
4699 if (m == MATCH_ERROR)
4702 if (gfc_match_eos () != MATCH_YES)
4705 if (strcmp (name, gfc_current_block ()->name) != 0)
4707 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4708 name, gfc_current_block ()->name);
4713 new_st.op = EXEC_WHERE;
4714 new_st.expr1 = expr;
4718 gfc_syntax_error (ST_ELSEWHERE);
4721 gfc_free_expr (expr);
4726 /******************** FORALL subroutines ********************/
4728 /* Free a list of FORALL iterators. */
4731 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4733 gfc_forall_iterator *next;
4738 gfc_free_expr (iter->var);
4739 gfc_free_expr (iter->start);
4740 gfc_free_expr (iter->end);
4741 gfc_free_expr (iter->stride);
4748 /* Match an iterator as part of a FORALL statement. The format is:
4750 <var> = <start>:<end>[:<stride>]
4752 On MATCH_NO, the caller tests for the possibility that there is a
4753 scalar mask expression. */
4756 match_forall_iterator (gfc_forall_iterator **result)
4758 gfc_forall_iterator *iter;
4762 where = gfc_current_locus;
4763 iter = XCNEW (gfc_forall_iterator);
4765 m = gfc_match_expr (&iter->var);
4769 if (gfc_match_char ('=') != MATCH_YES
4770 || iter->var->expr_type != EXPR_VARIABLE)
4776 m = gfc_match_expr (&iter->start);
4780 if (gfc_match_char (':') != MATCH_YES)
4783 m = gfc_match_expr (&iter->end);
4786 if (m == MATCH_ERROR)
4789 if (gfc_match_char (':') == MATCH_NO)
4790 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
4793 m = gfc_match_expr (&iter->stride);
4796 if (m == MATCH_ERROR)
4800 /* Mark the iteration variable's symbol as used as a FORALL index. */
4801 iter->var->symtree->n.sym->forall_index = true;
4807 gfc_error ("Syntax error in FORALL iterator at %C");
4812 gfc_current_locus = where;
4813 gfc_free_forall_iterator (iter);
4818 /* Match the header of a FORALL statement. */
4821 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
4823 gfc_forall_iterator *head, *tail, *new_iter;
4827 gfc_gobble_whitespace ();
4832 if (gfc_match_char ('(') != MATCH_YES)
4835 m = match_forall_iterator (&new_iter);
4836 if (m == MATCH_ERROR)
4841 head = tail = new_iter;
4845 if (gfc_match_char (',') != MATCH_YES)
4848 m = match_forall_iterator (&new_iter);
4849 if (m == MATCH_ERROR)
4854 tail->next = new_iter;
4859 /* Have to have a mask expression. */
4861 m = gfc_match_expr (&msk);
4864 if (m == MATCH_ERROR)
4870 if (gfc_match_char (')') == MATCH_NO)
4878 gfc_syntax_error (ST_FORALL);
4881 gfc_free_expr (msk);
4882 gfc_free_forall_iterator (head);
4887 /* Match the rest of a simple FORALL statement that follows an
4891 match_simple_forall (void)
4893 gfc_forall_iterator *head;
4902 m = match_forall_header (&head, &mask);
4909 m = gfc_match_assignment ();
4911 if (m == MATCH_ERROR)
4915 m = gfc_match_pointer_assignment ();
4916 if (m == MATCH_ERROR)
4922 c = gfc_get_code ();
4924 c->loc = gfc_current_locus;
4926 if (gfc_match_eos () != MATCH_YES)
4929 gfc_clear_new_st ();
4930 new_st.op = EXEC_FORALL;
4931 new_st.expr1 = mask;
4932 new_st.ext.forall_iterator = head;
4933 new_st.block = gfc_get_code ();
4935 new_st.block->op = EXEC_FORALL;
4936 new_st.block->next = c;
4941 gfc_syntax_error (ST_FORALL);
4944 gfc_free_forall_iterator (head);
4945 gfc_free_expr (mask);
4951 /* Match a FORALL statement. */
4954 gfc_match_forall (gfc_statement *st)
4956 gfc_forall_iterator *head;
4965 m0 = gfc_match_label ();
4966 if (m0 == MATCH_ERROR)
4969 m = gfc_match (" forall");
4973 m = match_forall_header (&head, &mask);
4974 if (m == MATCH_ERROR)
4979 if (gfc_match_eos () == MATCH_YES)
4981 *st = ST_FORALL_BLOCK;
4982 new_st.op = EXEC_FORALL;
4983 new_st.expr1 = mask;
4984 new_st.ext.forall_iterator = head;
4988 m = gfc_match_assignment ();
4989 if (m == MATCH_ERROR)
4993 m = gfc_match_pointer_assignment ();
4994 if (m == MATCH_ERROR)
5000 c = gfc_get_code ();
5002 c->loc = gfc_current_locus;
5004 gfc_clear_new_st ();
5005 new_st.op = EXEC_FORALL;
5006 new_st.expr1 = mask;
5007 new_st.ext.forall_iterator = head;
5008 new_st.block = gfc_get_code ();
5009 new_st.block->op = EXEC_FORALL;
5010 new_st.block->next = c;
5016 gfc_syntax_error (ST_FORALL);
5019 gfc_free_forall_iterator (head);
5020 gfc_free_expr (mask);
5021 gfc_free_statements (c);