1 /* Matching subroutines in all sizes, shapes and colors.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
29 int gfc_matching_procptr_assignment = 0;
30 bool gfc_matching_prefix = false;
32 /* Stack of SELECT TYPE statements. */
33 gfc_select_type_stack *select_type_stack = NULL;
35 /* For debugging and diagnostic purposes. Return the textual representation
36 of the intrinsic operator OP. */
38 gfc_op2string (gfc_intrinsic_op op)
46 case INTRINSIC_UMINUS:
52 case INTRINSIC_CONCAT:
56 case INTRINSIC_DIVIDE:
95 case INTRINSIC_ASSIGN:
98 case INTRINSIC_PARENTHESES:
105 gfc_internal_error ("gfc_op2string(): Bad code");
110 /******************** Generic matching subroutines ************************/
112 /* This function scans the current statement counting the opened and closed
113 parenthesis to make sure they are balanced. */
116 gfc_match_parens (void)
118 locus old_loc, where;
122 old_loc = gfc_current_locus;
129 c = gfc_next_char_literal (instring);
132 if (quote == ' ' && ((c == '\'') || (c == '"')))
138 if (quote != ' ' && c == quote)
145 if (c == '(' && quote == ' ')
148 where = gfc_current_locus;
150 if (c == ')' && quote == ' ')
153 where = gfc_current_locus;
157 gfc_current_locus = old_loc;
161 gfc_error ("Missing ')' in statement at or before %L", &where);
166 gfc_error ("Missing '(' in statement at or before %L", &where);
174 /* See if the next character is a special character that has
175 escaped by a \ via the -fbackslash option. */
178 gfc_match_special_char (gfc_char_t *res)
186 switch ((c = gfc_next_char_literal (1)))
219 /* Hexadecimal form of wide characters. */
220 len = (c == 'x' ? 2 : (c == 'u' ? 4 : 8));
222 for (i = 0; i < len; i++)
224 char buf[2] = { '\0', '\0' };
226 c = gfc_next_char_literal (1);
227 if (!gfc_wide_fits_in_byte (c)
228 || !gfc_check_digit ((unsigned char) c, 16))
231 buf[0] = (unsigned char) c;
233 n += strtol (buf, NULL, 16);
239 /* Unknown backslash codes are simply not expanded. */
248 /* In free form, match at least one space. Always matches in fixed
252 gfc_match_space (void)
257 if (gfc_current_form == FORM_FIXED)
260 old_loc = gfc_current_locus;
262 c = gfc_next_ascii_char ();
263 if (!gfc_is_whitespace (c))
265 gfc_current_locus = old_loc;
269 gfc_gobble_whitespace ();
275 /* Match an end of statement. End of statement is optional
276 whitespace, followed by a ';' or '\n' or comment '!'. If a
277 semicolon is found, we continue to eat whitespace and semicolons. */
290 old_loc = gfc_current_locus;
291 gfc_gobble_whitespace ();
293 c = gfc_next_ascii_char ();
299 c = gfc_next_ascii_char ();
316 gfc_current_locus = old_loc;
317 return (flag) ? MATCH_YES : MATCH_NO;
321 /* Match a literal integer on the input, setting the value on
322 MATCH_YES. Literal ints occur in kind-parameters as well as
323 old-style character length specifications. If cnt is non-NULL it
324 will be set to the number of digits. */
327 gfc_match_small_literal_int (int *value, int *cnt)
333 old_loc = gfc_current_locus;
336 gfc_gobble_whitespace ();
337 c = gfc_next_ascii_char ();
343 gfc_current_locus = old_loc;
352 old_loc = gfc_current_locus;
353 c = gfc_next_ascii_char ();
358 i = 10 * i + c - '0';
363 gfc_error ("Integer too large at %C");
368 gfc_current_locus = old_loc;
377 /* Match a small, constant integer expression, like in a kind
378 statement. On MATCH_YES, 'value' is set. */
381 gfc_match_small_int (int *value)
388 m = gfc_match_expr (&expr);
392 p = gfc_extract_int (expr, &i);
393 gfc_free_expr (expr);
406 /* This function is the same as the gfc_match_small_int, except that
407 we're keeping the pointer to the expr. This function could just be
408 removed and the previously mentioned one modified, though all calls
409 to it would have to be modified then (and there were a number of
410 them). Return MATCH_ERROR if fail to extract the int; otherwise,
411 return the result of gfc_match_expr(). The expr (if any) that was
412 matched is returned in the parameter expr. */
415 gfc_match_small_int_expr (int *value, gfc_expr **expr)
421 m = gfc_match_expr (expr);
425 p = gfc_extract_int (*expr, &i);
438 /* Matches a statement label. Uses gfc_match_small_literal_int() to
439 do most of the work. */
442 gfc_match_st_label (gfc_st_label **label)
448 old_loc = gfc_current_locus;
450 m = gfc_match_small_literal_int (&i, &cnt);
456 gfc_error ("Too many digits in statement label at %C");
462 gfc_error ("Statement label at %C is zero");
466 *label = gfc_get_st_label (i);
471 gfc_current_locus = old_loc;
476 /* Match and validate a label associated with a named IF, DO or SELECT
477 statement. If the symbol does not have the label attribute, we add
478 it. We also make sure the symbol does not refer to another
479 (active) block. A matched label is pointed to by gfc_new_block. */
482 gfc_match_label (void)
484 char name[GFC_MAX_SYMBOL_LEN + 1];
487 gfc_new_block = NULL;
489 m = gfc_match (" %n :", name);
493 if (gfc_get_symbol (name, NULL, &gfc_new_block))
495 gfc_error ("Label name '%s' at %C is ambiguous", name);
499 if (gfc_new_block->attr.flavor == FL_LABEL)
501 gfc_error ("Duplicate construct label '%s' at %C", name);
505 if (gfc_add_flavor (&gfc_new_block->attr, FL_LABEL,
506 gfc_new_block->name, NULL) == FAILURE)
513 /* See if the current input looks like a name of some sort. Modifies
514 the passed buffer which must be GFC_MAX_SYMBOL_LEN+1 bytes long.
515 Note that options.c restricts max_identifier_length to not more
516 than GFC_MAX_SYMBOL_LEN. */
519 gfc_match_name (char *buffer)
525 old_loc = gfc_current_locus;
526 gfc_gobble_whitespace ();
528 c = gfc_next_ascii_char ();
529 if (!(ISALPHA (c) || (c == '_' && gfc_option.flag_allow_leading_underscore)))
531 if (gfc_error_flag_test() == 0 && c != '(')
532 gfc_error ("Invalid character in name at %C");
533 gfc_current_locus = old_loc;
543 if (i > gfc_option.max_identifier_length)
545 gfc_error ("Name at %C is too long");
549 old_loc = gfc_current_locus;
550 c = gfc_next_ascii_char ();
552 while (ISALNUM (c) || c == '_' || (gfc_option.flag_dollar_ok && c == '$'));
554 if (c == '$' && !gfc_option.flag_dollar_ok)
556 gfc_error ("Invalid character '$' at %C. Use -fdollar-ok to allow it "
562 gfc_current_locus = old_loc;
568 /* Match a valid name for C, which is almost the same as for Fortran,
569 except that you can start with an underscore, etc.. It could have
570 been done by modifying the gfc_match_name, but this way other
571 things C allows can be added, such as no limits on the length.
572 Right now, the length is limited to the same thing as Fortran..
573 Also, by rewriting it, we use the gfc_next_char_C() to prevent the
574 input characters from being automatically lower cased, since C is
575 case sensitive. The parameter, buffer, is used to return the name
576 that is matched. Return MATCH_ERROR if the name is too long
577 (though this is a self-imposed limit), MATCH_NO if what we're
578 seeing isn't a name, and MATCH_YES if we successfully match a C
582 gfc_match_name_C (char *buffer)
588 old_loc = gfc_current_locus;
589 gfc_gobble_whitespace ();
591 /* Get the next char (first possible char of name) and see if
592 it's valid for C (either a letter or an underscore). */
593 c = gfc_next_char_literal (1);
595 /* If the user put nothing expect spaces between the quotes, it is valid
596 and simply means there is no name= specifier and the name is the fortran
597 symbol name, all lowercase. */
598 if (c == '"' || c == '\'')
601 gfc_current_locus = old_loc;
605 if (!ISALPHA (c) && c != '_')
607 gfc_error ("Invalid C name in NAME= specifier at %C");
611 /* Continue to read valid variable name characters. */
614 gcc_assert (gfc_wide_fits_in_byte (c));
616 buffer[i++] = (unsigned char) c;
618 /* C does not define a maximum length of variable names, to my
619 knowledge, but the compiler typically places a limit on them.
620 For now, i'll use the same as the fortran limit for simplicity,
621 but this may need to be changed to a dynamic buffer that can
622 be realloc'ed here if necessary, or more likely, a larger
624 if (i > gfc_option.max_identifier_length)
626 gfc_error ("Name at %C is too long");
630 old_loc = gfc_current_locus;
632 /* Get next char; param means we're in a string. */
633 c = gfc_next_char_literal (1);
634 } while (ISALNUM (c) || c == '_');
637 gfc_current_locus = old_loc;
639 /* See if we stopped because of whitespace. */
642 gfc_gobble_whitespace ();
643 c = gfc_peek_ascii_char ();
644 if (c != '"' && c != '\'')
646 gfc_error ("Embedded space in NAME= specifier at %C");
651 /* If we stopped because we had an invalid character for a C name, report
652 that to the user by returning MATCH_NO. */
653 if (c != '"' && c != '\'')
655 gfc_error ("Invalid C name in NAME= specifier at %C");
663 /* Match a symbol on the input. Modifies the pointer to the symbol
664 pointer if successful. */
667 gfc_match_sym_tree (gfc_symtree **matched_symbol, int host_assoc)
669 char buffer[GFC_MAX_SYMBOL_LEN + 1];
672 m = gfc_match_name (buffer);
677 return (gfc_get_ha_sym_tree (buffer, matched_symbol))
678 ? MATCH_ERROR : MATCH_YES;
680 if (gfc_get_sym_tree (buffer, NULL, matched_symbol, false))
688 gfc_match_symbol (gfc_symbol **matched_symbol, int host_assoc)
693 m = gfc_match_sym_tree (&st, host_assoc);
698 *matched_symbol = st->n.sym;
700 *matched_symbol = NULL;
703 *matched_symbol = NULL;
708 /* Match an intrinsic operator. Returns an INTRINSIC enum. While matching,
709 we always find INTRINSIC_PLUS before INTRINSIC_UPLUS. We work around this
713 gfc_match_intrinsic_op (gfc_intrinsic_op *result)
715 locus orig_loc = gfc_current_locus;
718 gfc_gobble_whitespace ();
719 ch = gfc_next_ascii_char ();
724 *result = INTRINSIC_PLUS;
729 *result = INTRINSIC_MINUS;
733 if (gfc_next_ascii_char () == '=')
736 *result = INTRINSIC_EQ;
742 if (gfc_peek_ascii_char () == '=')
745 gfc_next_ascii_char ();
746 *result = INTRINSIC_LE;
750 *result = INTRINSIC_LT;
754 if (gfc_peek_ascii_char () == '=')
757 gfc_next_ascii_char ();
758 *result = INTRINSIC_GE;
762 *result = INTRINSIC_GT;
766 if (gfc_peek_ascii_char () == '*')
769 gfc_next_ascii_char ();
770 *result = INTRINSIC_POWER;
774 *result = INTRINSIC_TIMES;
778 ch = gfc_peek_ascii_char ();
782 gfc_next_ascii_char ();
783 *result = INTRINSIC_NE;
789 gfc_next_ascii_char ();
790 *result = INTRINSIC_CONCAT;
794 *result = INTRINSIC_DIVIDE;
798 ch = gfc_next_ascii_char ();
802 if (gfc_next_ascii_char () == 'n'
803 && gfc_next_ascii_char () == 'd'
804 && gfc_next_ascii_char () == '.')
806 /* Matched ".and.". */
807 *result = INTRINSIC_AND;
813 if (gfc_next_ascii_char () == 'q')
815 ch = gfc_next_ascii_char ();
818 /* Matched ".eq.". */
819 *result = INTRINSIC_EQ_OS;
824 if (gfc_next_ascii_char () == '.')
826 /* Matched ".eqv.". */
827 *result = INTRINSIC_EQV;
835 ch = gfc_next_ascii_char ();
838 if (gfc_next_ascii_char () == '.')
840 /* Matched ".ge.". */
841 *result = INTRINSIC_GE_OS;
847 if (gfc_next_ascii_char () == '.')
849 /* Matched ".gt.". */
850 *result = INTRINSIC_GT_OS;
857 ch = gfc_next_ascii_char ();
860 if (gfc_next_ascii_char () == '.')
862 /* Matched ".le.". */
863 *result = INTRINSIC_LE_OS;
869 if (gfc_next_ascii_char () == '.')
871 /* Matched ".lt.". */
872 *result = INTRINSIC_LT_OS;
879 ch = gfc_next_ascii_char ();
882 ch = gfc_next_ascii_char ();
885 /* Matched ".ne.". */
886 *result = INTRINSIC_NE_OS;
891 if (gfc_next_ascii_char () == 'v'
892 && gfc_next_ascii_char () == '.')
894 /* Matched ".neqv.". */
895 *result = INTRINSIC_NEQV;
902 if (gfc_next_ascii_char () == 't'
903 && gfc_next_ascii_char () == '.')
905 /* Matched ".not.". */
906 *result = INTRINSIC_NOT;
913 if (gfc_next_ascii_char () == 'r'
914 && gfc_next_ascii_char () == '.')
916 /* Matched ".or.". */
917 *result = INTRINSIC_OR;
931 gfc_current_locus = orig_loc;
936 /* Match a loop control phrase:
938 <LVALUE> = <EXPR>, <EXPR> [, <EXPR> ]
940 If the final integer expression is not present, a constant unity
941 expression is returned. We don't return MATCH_ERROR until after
942 the equals sign is seen. */
945 gfc_match_iterator (gfc_iterator *iter, int init_flag)
947 char name[GFC_MAX_SYMBOL_LEN + 1];
948 gfc_expr *var, *e1, *e2, *e3;
952 /* Match the start of an iterator without affecting the symbol table. */
954 start = gfc_current_locus;
955 m = gfc_match (" %n =", name);
956 gfc_current_locus = start;
961 m = gfc_match_variable (&var, 0);
965 gfc_match_char ('=');
969 if (var->ref != NULL)
971 gfc_error ("Loop variable at %C cannot be a sub-component");
975 if (var->symtree->n.sym->attr.intent == INTENT_IN)
977 gfc_error ("Loop variable '%s' at %C cannot be INTENT(IN)",
978 var->symtree->n.sym->name);
982 var->symtree->n.sym->attr.implied_index = 1;
984 m = init_flag ? gfc_match_init_expr (&e1) : gfc_match_expr (&e1);
987 if (m == MATCH_ERROR)
990 if (gfc_match_char (',') != MATCH_YES)
993 m = init_flag ? gfc_match_init_expr (&e2) : gfc_match_expr (&e2);
996 if (m == MATCH_ERROR)
999 if (gfc_match_char (',') != MATCH_YES)
1001 e3 = gfc_int_expr (1);
1005 m = init_flag ? gfc_match_init_expr (&e3) : gfc_match_expr (&e3);
1006 if (m == MATCH_ERROR)
1010 gfc_error ("Expected a step value in iterator at %C");
1022 gfc_error ("Syntax error in iterator at %C");
1033 /* Tries to match the next non-whitespace character on the input.
1034 This subroutine does not return MATCH_ERROR. */
1037 gfc_match_char (char c)
1041 where = gfc_current_locus;
1042 gfc_gobble_whitespace ();
1044 if (gfc_next_ascii_char () == c)
1047 gfc_current_locus = where;
1052 /* General purpose matching subroutine. The target string is a
1053 scanf-like format string in which spaces correspond to arbitrary
1054 whitespace (including no whitespace), characters correspond to
1055 themselves. The %-codes are:
1057 %% Literal percent sign
1058 %e Expression, pointer to a pointer is set
1059 %s Symbol, pointer to the symbol is set
1060 %n Name, character buffer is set to name
1061 %t Matches end of statement.
1062 %o Matches an intrinsic operator, returned as an INTRINSIC enum.
1063 %l Matches a statement label
1064 %v Matches a variable expression (an lvalue)
1065 % Matches a required space (in free form) and optional spaces. */
1068 gfc_match (const char *target, ...)
1070 gfc_st_label **label;
1079 old_loc = gfc_current_locus;
1080 va_start (argp, target);
1090 gfc_gobble_whitespace ();
1101 vp = va_arg (argp, void **);
1102 n = gfc_match_expr ((gfc_expr **) vp);
1113 vp = va_arg (argp, void **);
1114 n = gfc_match_variable ((gfc_expr **) vp, 0);
1125 vp = va_arg (argp, void **);
1126 n = gfc_match_symbol ((gfc_symbol **) vp, 0);
1137 np = va_arg (argp, char *);
1138 n = gfc_match_name (np);
1149 label = va_arg (argp, gfc_st_label **);
1150 n = gfc_match_st_label (label);
1161 ip = va_arg (argp, int *);
1162 n = gfc_match_intrinsic_op ((gfc_intrinsic_op *) ip);
1173 if (gfc_match_eos () != MATCH_YES)
1181 if (gfc_match_space () == MATCH_YES)
1187 break; /* Fall through to character matcher. */
1190 gfc_internal_error ("gfc_match(): Bad match code %c", c);
1195 /* gfc_next_ascii_char converts characters to lower-case, so we shouldn't
1196 expect an upper case character here! */
1197 gcc_assert (TOLOWER (c) == c);
1199 if (c == gfc_next_ascii_char ())
1209 /* Clean up after a failed match. */
1210 gfc_current_locus = old_loc;
1211 va_start (argp, target);
1214 for (; matches > 0; matches--)
1216 while (*p++ != '%');
1224 /* Matches that don't have to be undone */
1229 (void) va_arg (argp, void **);
1234 vp = va_arg (argp, void **);
1235 gfc_free_expr ((struct gfc_expr *)*vp);
1248 /*********************** Statement level matching **********************/
1250 /* Matches the start of a program unit, which is the program keyword
1251 followed by an obligatory symbol. */
1254 gfc_match_program (void)
1259 m = gfc_match ("% %s%t", &sym);
1263 gfc_error ("Invalid form of PROGRAM statement at %C");
1267 if (m == MATCH_ERROR)
1270 if (gfc_add_flavor (&sym->attr, FL_PROGRAM, sym->name, NULL) == FAILURE)
1273 gfc_new_block = sym;
1279 /* Match a simple assignment statement. */
1282 gfc_match_assignment (void)
1284 gfc_expr *lvalue, *rvalue;
1288 old_loc = gfc_current_locus;
1291 m = gfc_match (" %v =", &lvalue);
1294 gfc_current_locus = old_loc;
1295 gfc_free_expr (lvalue);
1300 m = gfc_match (" %e%t", &rvalue);
1303 gfc_current_locus = old_loc;
1304 gfc_free_expr (lvalue);
1305 gfc_free_expr (rvalue);
1309 gfc_set_sym_referenced (lvalue->symtree->n.sym);
1311 new_st.op = EXEC_ASSIGN;
1312 new_st.expr1 = lvalue;
1313 new_st.expr2 = rvalue;
1315 gfc_check_do_variable (lvalue->symtree);
1321 /* Match a pointer assignment statement. */
1324 gfc_match_pointer_assignment (void)
1326 gfc_expr *lvalue, *rvalue;
1330 old_loc = gfc_current_locus;
1332 lvalue = rvalue = NULL;
1333 gfc_matching_procptr_assignment = 0;
1335 m = gfc_match (" %v =>", &lvalue);
1342 if (lvalue->symtree->n.sym->attr.proc_pointer
1343 || gfc_is_proc_ptr_comp (lvalue, NULL))
1344 gfc_matching_procptr_assignment = 1;
1346 m = gfc_match (" %e%t", &rvalue);
1347 gfc_matching_procptr_assignment = 0;
1351 new_st.op = EXEC_POINTER_ASSIGN;
1352 new_st.expr1 = lvalue;
1353 new_st.expr2 = rvalue;
1358 gfc_current_locus = old_loc;
1359 gfc_free_expr (lvalue);
1360 gfc_free_expr (rvalue);
1365 /* We try to match an easy arithmetic IF statement. This only happens
1366 when just after having encountered a simple IF statement. This code
1367 is really duplicate with parts of the gfc_match_if code, but this is
1371 match_arithmetic_if (void)
1373 gfc_st_label *l1, *l2, *l3;
1377 m = gfc_match (" ( %e ) %l , %l , %l%t", &expr, &l1, &l2, &l3);
1381 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1382 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1383 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1385 gfc_free_expr (expr);
1389 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1390 "statement at %C") == FAILURE)
1393 new_st.op = EXEC_ARITHMETIC_IF;
1394 new_st.expr1 = expr;
1403 /* The IF statement is a bit of a pain. First of all, there are three
1404 forms of it, the simple IF, the IF that starts a block and the
1407 There is a problem with the simple IF and that is the fact that we
1408 only have a single level of undo information on symbols. What this
1409 means is for a simple IF, we must re-match the whole IF statement
1410 multiple times in order to guarantee that the symbol table ends up
1411 in the proper state. */
1413 static match match_simple_forall (void);
1414 static match match_simple_where (void);
1417 gfc_match_if (gfc_statement *if_type)
1420 gfc_st_label *l1, *l2, *l3;
1421 locus old_loc, old_loc2;
1425 n = gfc_match_label ();
1426 if (n == MATCH_ERROR)
1429 old_loc = gfc_current_locus;
1431 m = gfc_match (" if ( %e", &expr);
1435 old_loc2 = gfc_current_locus;
1436 gfc_current_locus = old_loc;
1438 if (gfc_match_parens () == MATCH_ERROR)
1441 gfc_current_locus = old_loc2;
1443 if (gfc_match_char (')') != MATCH_YES)
1445 gfc_error ("Syntax error in IF-expression at %C");
1446 gfc_free_expr (expr);
1450 m = gfc_match (" %l , %l , %l%t", &l1, &l2, &l3);
1456 gfc_error ("Block label not appropriate for arithmetic IF "
1458 gfc_free_expr (expr);
1462 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1463 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1464 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1466 gfc_free_expr (expr);
1470 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1471 "statement at %C") == FAILURE)
1474 new_st.op = EXEC_ARITHMETIC_IF;
1475 new_st.expr1 = expr;
1480 *if_type = ST_ARITHMETIC_IF;
1484 if (gfc_match (" then%t") == MATCH_YES)
1486 new_st.op = EXEC_IF;
1487 new_st.expr1 = expr;
1488 *if_type = ST_IF_BLOCK;
1494 gfc_error ("Block label is not appropriate for IF statement at %C");
1495 gfc_free_expr (expr);
1499 /* At this point the only thing left is a simple IF statement. At
1500 this point, n has to be MATCH_NO, so we don't have to worry about
1501 re-matching a block label. From what we've got so far, try
1502 matching an assignment. */
1504 *if_type = ST_SIMPLE_IF;
1506 m = gfc_match_assignment ();
1510 gfc_free_expr (expr);
1511 gfc_undo_symbols ();
1512 gfc_current_locus = old_loc;
1514 /* m can be MATCH_NO or MATCH_ERROR, here. For MATCH_ERROR, a mangled
1515 assignment was found. For MATCH_NO, continue to call the various
1517 if (m == MATCH_ERROR)
1520 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1522 m = gfc_match_pointer_assignment ();
1526 gfc_free_expr (expr);
1527 gfc_undo_symbols ();
1528 gfc_current_locus = old_loc;
1530 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1532 /* Look at the next keyword to see which matcher to call. Matching
1533 the keyword doesn't affect the symbol table, so we don't have to
1534 restore between tries. */
1536 #define match(string, subr, statement) \
1537 if (gfc_match(string) == MATCH_YES) { m = subr(); goto got_match; }
1541 match ("allocate", gfc_match_allocate, ST_ALLOCATE)
1542 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT)
1543 match ("backspace", gfc_match_backspace, ST_BACKSPACE)
1544 match ("call", gfc_match_call, ST_CALL)
1545 match ("close", gfc_match_close, ST_CLOSE)
1546 match ("continue", gfc_match_continue, ST_CONTINUE)
1547 match ("cycle", gfc_match_cycle, ST_CYCLE)
1548 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE)
1549 match ("end file", gfc_match_endfile, ST_END_FILE)
1550 match ("exit", gfc_match_exit, ST_EXIT)
1551 match ("flush", gfc_match_flush, ST_FLUSH)
1552 match ("forall", match_simple_forall, ST_FORALL)
1553 match ("go to", gfc_match_goto, ST_GOTO)
1554 match ("if", match_arithmetic_if, ST_ARITHMETIC_IF)
1555 match ("inquire", gfc_match_inquire, ST_INQUIRE)
1556 match ("nullify", gfc_match_nullify, ST_NULLIFY)
1557 match ("open", gfc_match_open, ST_OPEN)
1558 match ("pause", gfc_match_pause, ST_NONE)
1559 match ("print", gfc_match_print, ST_WRITE)
1560 match ("read", gfc_match_read, ST_READ)
1561 match ("return", gfc_match_return, ST_RETURN)
1562 match ("rewind", gfc_match_rewind, ST_REWIND)
1563 match ("stop", gfc_match_stop, ST_STOP)
1564 match ("wait", gfc_match_wait, ST_WAIT)
1565 match ("where", match_simple_where, ST_WHERE)
1566 match ("write", gfc_match_write, ST_WRITE)
1568 /* The gfc_match_assignment() above may have returned a MATCH_NO
1569 where the assignment was to a named constant. Check that
1570 special case here. */
1571 m = gfc_match_assignment ();
1574 gfc_error ("Cannot assign to a named constant at %C");
1575 gfc_free_expr (expr);
1576 gfc_undo_symbols ();
1577 gfc_current_locus = old_loc;
1581 /* All else has failed, so give up. See if any of the matchers has
1582 stored an error message of some sort. */
1583 if (gfc_error_check () == 0)
1584 gfc_error ("Unclassifiable statement in IF-clause at %C");
1586 gfc_free_expr (expr);
1591 gfc_error ("Syntax error in IF-clause at %C");
1594 gfc_free_expr (expr);
1598 /* At this point, we've matched the single IF and the action clause
1599 is in new_st. Rearrange things so that the IF statement appears
1602 p = gfc_get_code ();
1603 p->next = gfc_get_code ();
1605 p->next->loc = gfc_current_locus;
1610 gfc_clear_new_st ();
1612 new_st.op = EXEC_IF;
1621 /* Match an ELSE statement. */
1624 gfc_match_else (void)
1626 char name[GFC_MAX_SYMBOL_LEN + 1];
1628 if (gfc_match_eos () == MATCH_YES)
1631 if (gfc_match_name (name) != MATCH_YES
1632 || gfc_current_block () == NULL
1633 || gfc_match_eos () != MATCH_YES)
1635 gfc_error ("Unexpected junk after ELSE statement at %C");
1639 if (strcmp (name, gfc_current_block ()->name) != 0)
1641 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1642 name, gfc_current_block ()->name);
1650 /* Match an ELSE IF statement. */
1653 gfc_match_elseif (void)
1655 char name[GFC_MAX_SYMBOL_LEN + 1];
1659 m = gfc_match (" ( %e ) then", &expr);
1663 if (gfc_match_eos () == MATCH_YES)
1666 if (gfc_match_name (name) != MATCH_YES
1667 || gfc_current_block () == NULL
1668 || gfc_match_eos () != MATCH_YES)
1670 gfc_error ("Unexpected junk after ELSE IF statement at %C");
1674 if (strcmp (name, gfc_current_block ()->name) != 0)
1676 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1677 name, gfc_current_block ()->name);
1682 new_st.op = EXEC_IF;
1683 new_st.expr1 = expr;
1687 gfc_free_expr (expr);
1692 /* Free a gfc_iterator structure. */
1695 gfc_free_iterator (gfc_iterator *iter, int flag)
1701 gfc_free_expr (iter->var);
1702 gfc_free_expr (iter->start);
1703 gfc_free_expr (iter->end);
1704 gfc_free_expr (iter->step);
1711 /* Match a BLOCK statement. */
1714 gfc_match_block (void)
1718 if (gfc_match_label () == MATCH_ERROR)
1721 if (gfc_match (" block") != MATCH_YES)
1724 /* For this to be a correct BLOCK statement, the line must end now. */
1725 m = gfc_match_eos ();
1726 if (m == MATCH_ERROR)
1735 /* Match a DO statement. */
1740 gfc_iterator iter, *ip;
1742 gfc_st_label *label;
1745 old_loc = gfc_current_locus;
1748 iter.var = iter.start = iter.end = iter.step = NULL;
1750 m = gfc_match_label ();
1751 if (m == MATCH_ERROR)
1754 if (gfc_match (" do") != MATCH_YES)
1757 m = gfc_match_st_label (&label);
1758 if (m == MATCH_ERROR)
1761 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1763 if (gfc_match_eos () == MATCH_YES)
1765 iter.end = gfc_logical_expr (1, NULL);
1766 new_st.op = EXEC_DO_WHILE;
1770 /* Match an optional comma, if no comma is found, a space is obligatory. */
1771 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1774 /* Check for balanced parens. */
1776 if (gfc_match_parens () == MATCH_ERROR)
1779 /* See if we have a DO WHILE. */
1780 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1782 new_st.op = EXEC_DO_WHILE;
1786 /* The abortive DO WHILE may have done something to the symbol
1787 table, so we start over. */
1788 gfc_undo_symbols ();
1789 gfc_current_locus = old_loc;
1791 gfc_match_label (); /* This won't error. */
1792 gfc_match (" do "); /* This will work. */
1794 gfc_match_st_label (&label); /* Can't error out. */
1795 gfc_match_char (','); /* Optional comma. */
1797 m = gfc_match_iterator (&iter, 0);
1800 if (m == MATCH_ERROR)
1803 iter.var->symtree->n.sym->attr.implied_index = 0;
1804 gfc_check_do_variable (iter.var->symtree);
1806 if (gfc_match_eos () != MATCH_YES)
1808 gfc_syntax_error (ST_DO);
1812 new_st.op = EXEC_DO;
1816 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1819 new_st.label1 = label;
1821 if (new_st.op == EXEC_DO_WHILE)
1822 new_st.expr1 = iter.end;
1825 new_st.ext.iterator = ip = gfc_get_iterator ();
1832 gfc_free_iterator (&iter, 0);
1838 /* Match an EXIT or CYCLE statement. */
1841 match_exit_cycle (gfc_statement st, gfc_exec_op op)
1843 gfc_state_data *p, *o;
1847 if (gfc_match_eos () == MATCH_YES)
1851 m = gfc_match ("% %s%t", &sym);
1852 if (m == MATCH_ERROR)
1856 gfc_syntax_error (st);
1860 if (sym->attr.flavor != FL_LABEL)
1862 gfc_error ("Name '%s' in %s statement at %C is not a loop name",
1863 sym->name, gfc_ascii_statement (st));
1868 /* Find the loop mentioned specified by the label (or lack of a label). */
1869 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
1870 if (p->state == COMP_DO && (sym == NULL || sym == p->sym))
1872 else if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
1878 gfc_error ("%s statement at %C is not within a loop",
1879 gfc_ascii_statement (st));
1881 gfc_error ("%s statement at %C is not within loop '%s'",
1882 gfc_ascii_statement (st), sym->name);
1889 gfc_error ("%s statement at %C leaving OpenMP structured block",
1890 gfc_ascii_statement (st));
1893 else if (st == ST_EXIT
1894 && p->previous != NULL
1895 && p->previous->state == COMP_OMP_STRUCTURED_BLOCK
1896 && (p->previous->head->op == EXEC_OMP_DO
1897 || p->previous->head->op == EXEC_OMP_PARALLEL_DO))
1899 gcc_assert (p->previous->head->next != NULL);
1900 gcc_assert (p->previous->head->next->op == EXEC_DO
1901 || p->previous->head->next->op == EXEC_DO_WHILE);
1902 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
1906 /* Save the first statement in the loop - needed by the backend. */
1907 new_st.ext.whichloop = p->head;
1915 /* Match the EXIT statement. */
1918 gfc_match_exit (void)
1920 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
1924 /* Match the CYCLE statement. */
1927 gfc_match_cycle (void)
1929 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
1933 /* Match a number or character constant after a STOP or PAUSE statement. */
1936 gfc_match_stopcode (gfc_statement st)
1946 if (gfc_match_eos () != MATCH_YES)
1948 m = gfc_match_small_literal_int (&stop_code, &cnt);
1949 if (m == MATCH_ERROR)
1952 if (m == MATCH_YES && cnt > 5)
1954 gfc_error ("Too many digits in STOP code at %C");
1960 /* Try a character constant. */
1961 m = gfc_match_expr (&e);
1962 if (m == MATCH_ERROR)
1966 if (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
1970 if (gfc_match_eos () != MATCH_YES)
1974 if (gfc_pure (NULL))
1976 gfc_error ("%s statement not allowed in PURE procedure at %C",
1977 gfc_ascii_statement (st));
1981 new_st.op = st == ST_STOP ? EXEC_STOP : EXEC_PAUSE;
1983 new_st.ext.stop_code = stop_code;
1988 gfc_syntax_error (st);
1997 /* Match the (deprecated) PAUSE statement. */
2000 gfc_match_pause (void)
2004 m = gfc_match_stopcode (ST_PAUSE);
2007 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2016 /* Match the STOP statement. */
2019 gfc_match_stop (void)
2021 return gfc_match_stopcode (ST_STOP);
2025 /* Match a CONTINUE statement. */
2028 gfc_match_continue (void)
2030 if (gfc_match_eos () != MATCH_YES)
2032 gfc_syntax_error (ST_CONTINUE);
2036 new_st.op = EXEC_CONTINUE;
2041 /* Match the (deprecated) ASSIGN statement. */
2044 gfc_match_assign (void)
2047 gfc_st_label *label;
2049 if (gfc_match (" %l", &label) == MATCH_YES)
2051 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2053 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2055 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2060 expr->symtree->n.sym->attr.assign = 1;
2062 new_st.op = EXEC_LABEL_ASSIGN;
2063 new_st.label1 = label;
2064 new_st.expr1 = expr;
2072 /* Match the GO TO statement. As a computed GOTO statement is
2073 matched, it is transformed into an equivalent SELECT block. No
2074 tree is necessary, and the resulting jumps-to-jumps are
2075 specifically optimized away by the back end. */
2078 gfc_match_goto (void)
2080 gfc_code *head, *tail;
2083 gfc_st_label *label;
2087 if (gfc_match (" %l%t", &label) == MATCH_YES)
2089 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2092 new_st.op = EXEC_GOTO;
2093 new_st.label1 = label;
2097 /* The assigned GO TO statement. */
2099 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2101 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2106 new_st.op = EXEC_GOTO;
2107 new_st.expr1 = expr;
2109 if (gfc_match_eos () == MATCH_YES)
2112 /* Match label list. */
2113 gfc_match_char (',');
2114 if (gfc_match_char ('(') != MATCH_YES)
2116 gfc_syntax_error (ST_GOTO);
2123 m = gfc_match_st_label (&label);
2127 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2131 head = tail = gfc_get_code ();
2134 tail->block = gfc_get_code ();
2138 tail->label1 = label;
2139 tail->op = EXEC_GOTO;
2141 while (gfc_match_char (',') == MATCH_YES);
2143 if (gfc_match (")%t") != MATCH_YES)
2148 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2151 new_st.block = head;
2156 /* Last chance is a computed GO TO statement. */
2157 if (gfc_match_char ('(') != MATCH_YES)
2159 gfc_syntax_error (ST_GOTO);
2168 m = gfc_match_st_label (&label);
2172 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2176 head = tail = gfc_get_code ();
2179 tail->block = gfc_get_code ();
2183 cp = gfc_get_case ();
2184 cp->low = cp->high = gfc_int_expr (i++);
2186 tail->op = EXEC_SELECT;
2187 tail->ext.case_list = cp;
2189 tail->next = gfc_get_code ();
2190 tail->next->op = EXEC_GOTO;
2191 tail->next->label1 = label;
2193 while (gfc_match_char (',') == MATCH_YES);
2195 if (gfc_match_char (')') != MATCH_YES)
2200 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2204 /* Get the rest of the statement. */
2205 gfc_match_char (',');
2207 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2210 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2211 "at %C") == FAILURE)
2214 /* At this point, a computed GOTO has been fully matched and an
2215 equivalent SELECT statement constructed. */
2217 new_st.op = EXEC_SELECT;
2218 new_st.expr1 = NULL;
2220 /* Hack: For a "real" SELECT, the expression is in expr. We put
2221 it in expr2 so we can distinguish then and produce the correct
2223 new_st.expr2 = expr;
2224 new_st.block = head;
2228 gfc_syntax_error (ST_GOTO);
2230 gfc_free_statements (head);
2235 /* Frees a list of gfc_alloc structures. */
2238 gfc_free_alloc_list (gfc_alloc *p)
2245 gfc_free_expr (p->expr);
2251 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2252 an accessible derived type. */
2255 match_derived_type_spec (gfc_typespec *ts)
2258 gfc_symbol *derived;
2260 old_locus = gfc_current_locus;
2262 if (gfc_match_symbol (&derived, 1) == MATCH_YES)
2264 if (derived->attr.flavor == FL_DERIVED)
2266 ts->type = BT_DERIVED;
2267 ts->u.derived = derived;
2272 /* Enforce F03:C476. */
2273 gfc_error ("'%s' at %L is not an accessible derived type",
2274 derived->name, &gfc_current_locus);
2279 gfc_current_locus = old_locus;
2284 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2285 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2286 It only includes the intrinsic types from the Fortran 2003 standard
2287 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2288 the implicit_flag is not needed, so it was removed. Derived types are
2289 identified by their name alone. */
2292 match_type_spec (gfc_typespec *ts)
2298 old_locus = gfc_current_locus;
2300 if (gfc_match ("integer") == MATCH_YES)
2302 ts->type = BT_INTEGER;
2303 ts->kind = gfc_default_integer_kind;
2307 if (gfc_match ("real") == MATCH_YES)
2310 ts->kind = gfc_default_real_kind;
2314 if (gfc_match ("double precision") == MATCH_YES)
2317 ts->kind = gfc_default_double_kind;
2321 if (gfc_match ("complex") == MATCH_YES)
2323 ts->type = BT_COMPLEX;
2324 ts->kind = gfc_default_complex_kind;
2328 if (gfc_match ("character") == MATCH_YES)
2330 ts->type = BT_CHARACTER;
2334 if (gfc_match ("logical") == MATCH_YES)
2336 ts->type = BT_LOGICAL;
2337 ts->kind = gfc_default_logical_kind;
2341 m = match_derived_type_spec (ts);
2344 old_locus = gfc_current_locus;
2345 if (gfc_match (" :: ") != MATCH_YES)
2347 gfc_current_locus = old_locus;
2348 /* Enfore F03:C401. */
2349 if (ts->u.derived->attr.abstract)
2351 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2352 ts->u.derived->name, &old_locus);
2357 else if (m == MATCH_ERROR && gfc_match (" :: ") == MATCH_YES)
2360 /* If a type is not matched, simply return MATCH_NO. */
2361 gfc_current_locus = old_locus;
2366 gfc_gobble_whitespace ();
2367 if (gfc_peek_ascii_char () == '*')
2369 gfc_error ("Invalid type-spec at %C");
2373 m = gfc_match_kind_spec (ts, false);
2376 m = MATCH_YES; /* No kind specifier found. */
2382 m = gfc_match_char_spec (ts);
2385 m = MATCH_YES; /* No kind specifier found. */
2391 /* Match an ALLOCATE statement. */
2394 gfc_match_allocate (void)
2396 gfc_alloc *head, *tail;
2397 gfc_expr *stat, *errmsg, *tmp, *source;
2402 bool saw_stat, saw_errmsg, saw_source, b1, b2, b3;
2405 stat = errmsg = source = tmp = NULL;
2406 saw_stat = saw_errmsg = saw_source = false;
2408 if (gfc_match_char ('(') != MATCH_YES)
2411 /* Match an optional type-spec. */
2412 old_locus = gfc_current_locus;
2413 m = match_type_spec (&ts);
2414 if (m == MATCH_ERROR)
2416 else if (m == MATCH_NO)
2417 ts.type = BT_UNKNOWN;
2420 if (gfc_match (" :: ") == MATCH_YES)
2422 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2423 "ALLOCATE at %L", &old_locus) == FAILURE)
2428 ts.type = BT_UNKNOWN;
2429 gfc_current_locus = old_locus;
2436 head = tail = gfc_get_alloc ();
2439 tail->next = gfc_get_alloc ();
2443 m = gfc_match_variable (&tail->expr, 0);
2446 if (m == MATCH_ERROR)
2449 if (gfc_check_do_variable (tail->expr->symtree))
2452 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2454 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2458 /* The ALLOCATE statement had an optional typespec. Check the
2460 if (ts.type != BT_UNKNOWN)
2462 /* Enforce F03:C624. */
2463 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2465 gfc_error ("Type of entity at %L is type incompatible with "
2466 "typespec", &tail->expr->where);
2470 /* Enforce F03:C627. */
2471 if (ts.kind != tail->expr->ts.kind)
2473 gfc_error ("Kind type parameter for entity at %L differs from "
2474 "the kind type parameter of the typespec",
2475 &tail->expr->where);
2480 if (tail->expr->ts.type == BT_DERIVED)
2481 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2483 /* FIXME: disable the checking on derived types and arrays. */
2484 sym = tail->expr->symtree->n.sym;
2485 b1 = !(tail->expr->ref
2486 && (tail->expr->ref->type == REF_COMPONENT
2487 || tail->expr->ref->type == REF_ARRAY));
2488 if (sym && sym->ts.type == BT_CLASS)
2489 b2 = !(sym->ts.u.derived->components->attr.allocatable
2490 || sym->ts.u.derived->components->attr.pointer);
2492 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2493 || sym->attr.proc_pointer);
2494 b3 = sym && sym->ns && sym->ns->proc_name
2495 && (sym->ns->proc_name->attr.allocatable
2496 || sym->ns->proc_name->attr.pointer
2497 || sym->ns->proc_name->attr.proc_pointer);
2498 if (b1 && b2 && !b3)
2500 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2501 "or an allocatable variable");
2505 if (gfc_match_char (',') != MATCH_YES)
2510 m = gfc_match (" stat = %v", &tmp);
2511 if (m == MATCH_ERROR)
2518 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2525 if (gfc_check_do_variable (stat->symtree))
2528 if (gfc_match_char (',') == MATCH_YES)
2529 goto alloc_opt_list;
2532 m = gfc_match (" errmsg = %v", &tmp);
2533 if (m == MATCH_ERROR)
2537 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
2538 &tmp->where) == FAILURE)
2544 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2551 if (gfc_match_char (',') == MATCH_YES)
2552 goto alloc_opt_list;
2555 m = gfc_match (" source = %e", &tmp);
2556 if (m == MATCH_ERROR)
2560 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
2561 &tmp->where) == FAILURE)
2567 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
2571 /* The next 2 conditionals check C631. */
2572 if (ts.type != BT_UNKNOWN)
2574 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
2575 &tmp->where, &old_locus);
2581 gfc_error ("SOURCE tag at %L requires only a single entity in "
2582 "the allocation-list", &tmp->where);
2589 if (gfc_match_char (',') == MATCH_YES)
2590 goto alloc_opt_list;
2593 gfc_gobble_whitespace ();
2595 if (gfc_peek_char () == ')')
2600 if (gfc_match (" )%t") != MATCH_YES)
2603 new_st.op = EXEC_ALLOCATE;
2604 new_st.expr1 = stat;
2605 new_st.expr2 = errmsg;
2606 new_st.expr3 = source;
2607 new_st.ext.alloc.list = head;
2608 new_st.ext.alloc.ts = ts;
2613 gfc_syntax_error (ST_ALLOCATE);
2616 gfc_free_expr (errmsg);
2617 gfc_free_expr (source);
2618 gfc_free_expr (stat);
2619 gfc_free_expr (tmp);
2620 gfc_free_alloc_list (head);
2625 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
2626 a set of pointer assignments to intrinsic NULL(). */
2629 gfc_match_nullify (void)
2637 if (gfc_match_char ('(') != MATCH_YES)
2642 m = gfc_match_variable (&p, 0);
2643 if (m == MATCH_ERROR)
2648 if (gfc_check_do_variable (p->symtree))
2651 if (gfc_pure (NULL) && gfc_impure_variable (p->symtree->n.sym))
2653 gfc_error ("Illegal variable in NULLIFY at %C for a PURE procedure");
2657 /* build ' => NULL() '. */
2658 e = gfc_get_expr ();
2659 e->where = gfc_current_locus;
2660 e->expr_type = EXPR_NULL;
2661 e->ts.type = BT_UNKNOWN;
2663 /* Chain to list. */
2668 tail->next = gfc_get_code ();
2672 tail->op = EXEC_POINTER_ASSIGN;
2676 if (gfc_match (" )%t") == MATCH_YES)
2678 if (gfc_match_char (',') != MATCH_YES)
2685 gfc_syntax_error (ST_NULLIFY);
2688 gfc_free_statements (new_st.next);
2690 gfc_free_expr (new_st.expr1);
2691 new_st.expr1 = NULL;
2692 gfc_free_expr (new_st.expr2);
2693 new_st.expr2 = NULL;
2698 /* Match a DEALLOCATE statement. */
2701 gfc_match_deallocate (void)
2703 gfc_alloc *head, *tail;
2704 gfc_expr *stat, *errmsg, *tmp;
2707 bool saw_stat, saw_errmsg, b1, b2;
2710 stat = errmsg = tmp = NULL;
2711 saw_stat = saw_errmsg = false;
2713 if (gfc_match_char ('(') != MATCH_YES)
2719 head = tail = gfc_get_alloc ();
2722 tail->next = gfc_get_alloc ();
2726 m = gfc_match_variable (&tail->expr, 0);
2727 if (m == MATCH_ERROR)
2732 if (gfc_check_do_variable (tail->expr->symtree))
2735 sym = tail->expr->symtree->n.sym;
2737 if (gfc_pure (NULL) && gfc_impure_variable (sym))
2739 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
2743 /* FIXME: disable the checking on derived types. */
2744 b1 = !(tail->expr->ref
2745 && (tail->expr->ref->type == REF_COMPONENT
2746 || tail->expr->ref->type == REF_ARRAY));
2747 if (sym && sym->ts.type == BT_CLASS)
2748 b2 = !(sym->ts.u.derived->components->attr.allocatable
2749 || sym->ts.u.derived->components->attr.pointer);
2751 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2752 || sym->attr.proc_pointer);
2755 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2756 "or an allocatable variable");
2760 if (gfc_match_char (',') != MATCH_YES)
2765 m = gfc_match (" stat = %v", &tmp);
2766 if (m == MATCH_ERROR)
2772 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2773 gfc_free_expr (tmp);
2780 if (gfc_check_do_variable (stat->symtree))
2783 if (gfc_match_char (',') == MATCH_YES)
2784 goto dealloc_opt_list;
2787 m = gfc_match (" errmsg = %v", &tmp);
2788 if (m == MATCH_ERROR)
2792 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
2793 &tmp->where) == FAILURE)
2798 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2799 gfc_free_expr (tmp);
2806 if (gfc_match_char (',') == MATCH_YES)
2807 goto dealloc_opt_list;
2810 gfc_gobble_whitespace ();
2812 if (gfc_peek_char () == ')')
2816 if (gfc_match (" )%t") != MATCH_YES)
2819 new_st.op = EXEC_DEALLOCATE;
2820 new_st.expr1 = stat;
2821 new_st.expr2 = errmsg;
2822 new_st.ext.alloc.list = head;
2827 gfc_syntax_error (ST_DEALLOCATE);
2830 gfc_free_expr (errmsg);
2831 gfc_free_expr (stat);
2832 gfc_free_alloc_list (head);
2837 /* Match a RETURN statement. */
2840 gfc_match_return (void)
2844 gfc_compile_state s;
2847 if (gfc_match_eos () == MATCH_YES)
2850 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
2852 gfc_error ("Alternate RETURN statement at %C is only allowed within "
2857 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
2858 "at %C") == FAILURE)
2861 if (gfc_current_form == FORM_FREE)
2863 /* The following are valid, so we can't require a blank after the
2867 char c = gfc_peek_ascii_char ();
2868 if (ISALPHA (c) || ISDIGIT (c))
2872 m = gfc_match (" %e%t", &e);
2875 if (m == MATCH_ERROR)
2878 gfc_syntax_error (ST_RETURN);
2885 gfc_enclosing_unit (&s);
2886 if (s == COMP_PROGRAM
2887 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
2888 "main program at %C") == FAILURE)
2891 new_st.op = EXEC_RETURN;
2898 /* Match the call of a type-bound procedure, if CALL%var has already been
2899 matched and var found to be a derived-type variable. */
2902 match_typebound_call (gfc_symtree* varst)
2910 base = gfc_get_expr ();
2911 base->expr_type = EXPR_VARIABLE;
2912 base->symtree = varst;
2913 base->where = gfc_current_locus;
2914 gfc_set_sym_referenced (varst->n.sym);
2916 m = gfc_match_varspec (base, 0, true, true);
2918 gfc_error ("Expected component reference at %C");
2922 if (gfc_match_eos () != MATCH_YES)
2924 gfc_error ("Junk after CALL at %C");
2928 if (base->expr_type == EXPR_COMPCALL)
2929 new_st.op = EXEC_COMPCALL;
2930 else if (base->expr_type == EXPR_PPC)
2931 new_st.op = EXEC_CALL_PPC;
2934 gfc_error ("Expected type-bound procedure or procedure pointer component "
2938 new_st.expr1 = base;
2944 /* Match a CALL statement. The tricky part here are possible
2945 alternate return specifiers. We handle these by having all
2946 "subroutines" actually return an integer via a register that gives
2947 the return number. If the call specifies alternate returns, we
2948 generate code for a SELECT statement whose case clauses contain
2949 GOTOs to the various labels. */
2952 gfc_match_call (void)
2954 char name[GFC_MAX_SYMBOL_LEN + 1];
2955 gfc_actual_arglist *a, *arglist;
2965 m = gfc_match ("% %n", name);
2971 if (gfc_get_ha_sym_tree (name, &st))
2976 /* If this is a variable of derived-type, it probably starts a type-bound
2978 if ((sym->attr.flavor != FL_PROCEDURE || sym == gfc_current_ns->proc_name)
2979 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
2980 return match_typebound_call (st);
2982 /* If it does not seem to be callable (include functions so that the
2983 right association is made. They are thrown out in resolution.)
2985 if (!sym->attr.generic
2986 && !sym->attr.subroutine
2987 && !sym->attr.function)
2989 if (!(sym->attr.external && !sym->attr.referenced))
2991 /* ...create a symbol in this scope... */
2992 if (sym->ns != gfc_current_ns
2993 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
2996 if (sym != st->n.sym)
3000 /* ...and then to try to make the symbol into a subroutine. */
3001 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3005 gfc_set_sym_referenced (sym);
3007 if (gfc_match_eos () != MATCH_YES)
3009 m = gfc_match_actual_arglist (1, &arglist);
3012 if (m == MATCH_ERROR)
3015 if (gfc_match_eos () != MATCH_YES)
3019 /* If any alternate return labels were found, construct a SELECT
3020 statement that will jump to the right place. */
3023 for (a = arglist; a; a = a->next)
3024 if (a->expr == NULL)
3029 gfc_symtree *select_st;
3030 gfc_symbol *select_sym;
3031 char name[GFC_MAX_SYMBOL_LEN + 1];
3033 new_st.next = c = gfc_get_code ();
3034 c->op = EXEC_SELECT;
3035 sprintf (name, "_result_%s", sym->name);
3036 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3038 select_sym = select_st->n.sym;
3039 select_sym->ts.type = BT_INTEGER;
3040 select_sym->ts.kind = gfc_default_integer_kind;
3041 gfc_set_sym_referenced (select_sym);
3042 c->expr1 = gfc_get_expr ();
3043 c->expr1->expr_type = EXPR_VARIABLE;
3044 c->expr1->symtree = select_st;
3045 c->expr1->ts = select_sym->ts;
3046 c->expr1->where = gfc_current_locus;
3049 for (a = arglist; a; a = a->next)
3051 if (a->expr != NULL)
3054 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3059 c->block = gfc_get_code ();
3061 c->op = EXEC_SELECT;
3063 new_case = gfc_get_case ();
3064 new_case->high = new_case->low = gfc_int_expr (i);
3065 c->ext.case_list = new_case;
3067 c->next = gfc_get_code ();
3068 c->next->op = EXEC_GOTO;
3069 c->next->label1 = a->label;
3073 new_st.op = EXEC_CALL;
3074 new_st.symtree = st;
3075 new_st.ext.actual = arglist;
3080 gfc_syntax_error (ST_CALL);
3083 gfc_free_actual_arglist (arglist);
3088 /* Given a name, return a pointer to the common head structure,
3089 creating it if it does not exist. If FROM_MODULE is nonzero, we
3090 mangle the name so that it doesn't interfere with commons defined
3091 in the using namespace.
3092 TODO: Add to global symbol tree. */
3095 gfc_get_common (const char *name, int from_module)
3098 static int serial = 0;
3099 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3103 /* A use associated common block is only needed to correctly layout
3104 the variables it contains. */
3105 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3106 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3110 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3113 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3116 if (st->n.common == NULL)
3118 st->n.common = gfc_get_common_head ();
3119 st->n.common->where = gfc_current_locus;
3120 strcpy (st->n.common->name, name);
3123 return st->n.common;
3127 /* Match a common block name. */
3129 match match_common_name (char *name)
3133 if (gfc_match_char ('/') == MATCH_NO)
3139 if (gfc_match_char ('/') == MATCH_YES)
3145 m = gfc_match_name (name);
3147 if (m == MATCH_ERROR)
3149 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3152 gfc_error ("Syntax error in common block name at %C");
3157 /* Match a COMMON statement. */
3160 gfc_match_common (void)
3162 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3163 char name[GFC_MAX_SYMBOL_LEN + 1];
3170 old_blank_common = gfc_current_ns->blank_common.head;
3171 if (old_blank_common)
3173 while (old_blank_common->common_next)
3174 old_blank_common = old_blank_common->common_next;
3181 m = match_common_name (name);
3182 if (m == MATCH_ERROR)
3185 gsym = gfc_get_gsymbol (name);
3186 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3188 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3189 "is not COMMON", name);
3193 if (gsym->type == GSYM_UNKNOWN)
3195 gsym->type = GSYM_COMMON;
3196 gsym->where = gfc_current_locus;
3202 if (name[0] == '\0')
3204 t = &gfc_current_ns->blank_common;
3205 if (t->head == NULL)
3206 t->where = gfc_current_locus;
3210 t = gfc_get_common (name, 0);
3219 while (tail->common_next)
3220 tail = tail->common_next;
3223 /* Grab the list of symbols. */
3226 m = gfc_match_symbol (&sym, 0);
3227 if (m == MATCH_ERROR)
3232 /* Store a ref to the common block for error checking. */
3233 sym->common_block = t;
3235 /* See if we know the current common block is bind(c), and if
3236 so, then see if we can check if the symbol is (which it'll
3237 need to be). This can happen if the bind(c) attr stmt was
3238 applied to the common block, and the variable(s) already
3239 defined, before declaring the common block. */
3240 if (t->is_bind_c == 1)
3242 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3244 /* If we find an error, just print it and continue,
3245 cause it's just semantic, and we can see if there
3247 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3248 "at %C must be declared with a C "
3249 "interoperable kind since common block "
3251 sym->name, &(sym->declared_at), t->name,
3255 if (sym->attr.is_bind_c == 1)
3256 gfc_error_now ("Variable '%s' in common block "
3257 "'%s' at %C can not be bind(c) since "
3258 "it is not global", sym->name, t->name);
3261 if (sym->attr.in_common)
3263 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3268 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3269 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3271 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3272 "can only be COMMON in "
3273 "BLOCK DATA", sym->name)
3278 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3282 tail->common_next = sym;
3288 /* Deal with an optional array specification after the
3290 m = gfc_match_array_spec (&as);
3291 if (m == MATCH_ERROR)
3296 if (as->type != AS_EXPLICIT)
3298 gfc_error ("Array specification for symbol '%s' in COMMON "
3299 "at %C must be explicit", sym->name);
3303 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3306 if (sym->attr.pointer)
3308 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3309 "POINTER array", sym->name);
3318 sym->common_head = t;
3320 /* Check to see if the symbol is already in an equivalence group.
3321 If it is, set the other members as being in common. */
3322 if (sym->attr.in_equivalence)
3324 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3326 for (e2 = e1; e2; e2 = e2->eq)
3327 if (e2->expr->symtree->n.sym == sym)
3334 for (e2 = e1; e2; e2 = e2->eq)
3336 other = e2->expr->symtree->n.sym;
3337 if (other->common_head
3338 && other->common_head != sym->common_head)
3340 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3341 "%C is being indirectly equivalenced to "
3342 "another COMMON block '%s'",
3343 sym->name, sym->common_head->name,
3344 other->common_head->name);
3347 other->attr.in_common = 1;
3348 other->common_head = t;
3354 gfc_gobble_whitespace ();
3355 if (gfc_match_eos () == MATCH_YES)
3357 if (gfc_peek_ascii_char () == '/')
3359 if (gfc_match_char (',') != MATCH_YES)
3361 gfc_gobble_whitespace ();
3362 if (gfc_peek_ascii_char () == '/')
3371 gfc_syntax_error (ST_COMMON);
3374 if (old_blank_common)
3375 old_blank_common->common_next = NULL;
3377 gfc_current_ns->blank_common.head = NULL;
3378 gfc_free_array_spec (as);
3383 /* Match a BLOCK DATA program unit. */
3386 gfc_match_block_data (void)
3388 char name[GFC_MAX_SYMBOL_LEN + 1];
3392 if (gfc_match_eos () == MATCH_YES)
3394 gfc_new_block = NULL;
3398 m = gfc_match ("% %n%t", name);
3402 if (gfc_get_symbol (name, NULL, &sym))
3405 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3408 gfc_new_block = sym;
3414 /* Free a namelist structure. */
3417 gfc_free_namelist (gfc_namelist *name)
3421 for (; name; name = n)
3429 /* Match a NAMELIST statement. */
3432 gfc_match_namelist (void)
3434 gfc_symbol *group_name, *sym;
3438 m = gfc_match (" / %s /", &group_name);
3441 if (m == MATCH_ERROR)
3446 if (group_name->ts.type != BT_UNKNOWN)
3448 gfc_error ("Namelist group name '%s' at %C already has a basic "
3449 "type of %s", group_name->name,
3450 gfc_typename (&group_name->ts));
3454 if (group_name->attr.flavor == FL_NAMELIST
3455 && group_name->attr.use_assoc
3456 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3457 "at %C already is USE associated and can"
3458 "not be respecified.", group_name->name)
3462 if (group_name->attr.flavor != FL_NAMELIST
3463 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3464 group_name->name, NULL) == FAILURE)
3469 m = gfc_match_symbol (&sym, 1);
3472 if (m == MATCH_ERROR)
3475 if (sym->attr.in_namelist == 0
3476 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
3479 /* Use gfc_error_check here, rather than goto error, so that
3480 these are the only errors for the next two lines. */
3481 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
3483 gfc_error ("Assumed size array '%s' in namelist '%s' at "
3484 "%C is not allowed", sym->name, group_name->name);
3488 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
3490 gfc_error ("Assumed character length '%s' in namelist '%s' at "
3491 "%C is not allowed", sym->name, group_name->name);
3495 nl = gfc_get_namelist ();
3499 if (group_name->namelist == NULL)
3500 group_name->namelist = group_name->namelist_tail = nl;
3503 group_name->namelist_tail->next = nl;
3504 group_name->namelist_tail = nl;
3507 if (gfc_match_eos () == MATCH_YES)
3510 m = gfc_match_char (',');
3512 if (gfc_match_char ('/') == MATCH_YES)
3514 m2 = gfc_match (" %s /", &group_name);
3515 if (m2 == MATCH_YES)
3517 if (m2 == MATCH_ERROR)
3531 gfc_syntax_error (ST_NAMELIST);
3538 /* Match a MODULE statement. */
3541 gfc_match_module (void)
3545 m = gfc_match (" %s%t", &gfc_new_block);
3549 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
3550 gfc_new_block->name, NULL) == FAILURE)
3557 /* Free equivalence sets and lists. Recursively is the easiest way to
3561 gfc_free_equiv (gfc_equiv *eq)
3566 gfc_free_equiv (eq->eq);
3567 gfc_free_equiv (eq->next);
3568 gfc_free_expr (eq->expr);
3573 /* Match an EQUIVALENCE statement. */
3576 gfc_match_equivalence (void)
3578 gfc_equiv *eq, *set, *tail;
3582 gfc_common_head *common_head = NULL;
3590 eq = gfc_get_equiv ();
3594 eq->next = gfc_current_ns->equiv;
3595 gfc_current_ns->equiv = eq;
3597 if (gfc_match_char ('(') != MATCH_YES)
3601 common_flag = FALSE;
3606 m = gfc_match_equiv_variable (&set->expr);
3607 if (m == MATCH_ERROR)
3612 /* count the number of objects. */
3615 if (gfc_match_char ('%') == MATCH_YES)
3617 gfc_error ("Derived type component %C is not a "
3618 "permitted EQUIVALENCE member");
3622 for (ref = set->expr->ref; ref; ref = ref->next)
3623 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
3625 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
3626 "be an array section");
3630 sym = set->expr->symtree->n.sym;
3632 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
3635 if (sym->attr.in_common)
3638 common_head = sym->common_head;
3641 if (gfc_match_char (')') == MATCH_YES)
3644 if (gfc_match_char (',') != MATCH_YES)
3647 set->eq = gfc_get_equiv ();
3653 gfc_error ("EQUIVALENCE at %C requires two or more objects");
3657 /* If one of the members of an equivalence is in common, then
3658 mark them all as being in common. Before doing this, check
3659 that members of the equivalence group are not in different
3662 for (set = eq; set; set = set->eq)
3664 sym = set->expr->symtree->n.sym;
3665 if (sym->common_head && sym->common_head != common_head)
3667 gfc_error ("Attempt to indirectly overlap COMMON "
3668 "blocks %s and %s by EQUIVALENCE at %C",
3669 sym->common_head->name, common_head->name);
3672 sym->attr.in_common = 1;
3673 sym->common_head = common_head;
3676 if (gfc_match_eos () == MATCH_YES)
3678 if (gfc_match_char (',') != MATCH_YES)
3680 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
3688 gfc_syntax_error (ST_EQUIVALENCE);
3694 gfc_free_equiv (gfc_current_ns->equiv);
3695 gfc_current_ns->equiv = eq;
3701 /* Check that a statement function is not recursive. This is done by looking
3702 for the statement function symbol(sym) by looking recursively through its
3703 expression(e). If a reference to sym is found, true is returned.
3704 12.5.4 requires that any variable of function that is implicitly typed
3705 shall have that type confirmed by any subsequent type declaration. The
3706 implicit typing is conveniently done here. */
3708 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
3711 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
3717 switch (e->expr_type)
3720 if (e->symtree == NULL)
3723 /* Check the name before testing for nested recursion! */
3724 if (sym->name == e->symtree->n.sym->name)
3727 /* Catch recursion via other statement functions. */
3728 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
3729 && e->symtree->n.sym->value
3730 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
3733 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
3734 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
3739 if (e->symtree && sym->name == e->symtree->n.sym->name)
3742 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
3743 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
3755 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
3757 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
3761 /* Match a statement function declaration. It is so easy to match
3762 non-statement function statements with a MATCH_ERROR as opposed to
3763 MATCH_NO that we suppress error message in most cases. */
3766 gfc_match_st_function (void)
3768 gfc_error_buf old_error;
3773 m = gfc_match_symbol (&sym, 0);
3777 gfc_push_error (&old_error);
3779 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
3780 sym->name, NULL) == FAILURE)
3783 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
3786 m = gfc_match (" = %e%t", &expr);
3790 gfc_free_error (&old_error);
3791 if (m == MATCH_ERROR)
3794 if (recursive_stmt_fcn (expr, sym))
3796 gfc_error ("Statement function at %L is recursive", &expr->where);
3802 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
3803 "Statement function at %C") == FAILURE)
3809 gfc_pop_error (&old_error);
3814 /***************** SELECT CASE subroutines ******************/
3816 /* Free a single case structure. */
3819 free_case (gfc_case *p)
3821 if (p->low == p->high)
3823 gfc_free_expr (p->low);
3824 gfc_free_expr (p->high);
3829 /* Free a list of case structures. */
3832 gfc_free_case_list (gfc_case *p)
3844 /* Match a single case selector. */
3847 match_case_selector (gfc_case **cp)
3852 c = gfc_get_case ();
3853 c->where = gfc_current_locus;
3855 if (gfc_match_char (':') == MATCH_YES)
3857 m = gfc_match_init_expr (&c->high);
3860 if (m == MATCH_ERROR)
3865 m = gfc_match_init_expr (&c->low);
3866 if (m == MATCH_ERROR)
3871 /* If we're not looking at a ':' now, make a range out of a single
3872 target. Else get the upper bound for the case range. */
3873 if (gfc_match_char (':') != MATCH_YES)
3877 m = gfc_match_init_expr (&c->high);
3878 if (m == MATCH_ERROR)
3880 /* MATCH_NO is fine. It's OK if nothing is there! */
3888 gfc_error ("Expected initialization expression in CASE at %C");
3896 /* Match the end of a case statement. */
3899 match_case_eos (void)
3901 char name[GFC_MAX_SYMBOL_LEN + 1];
3904 if (gfc_match_eos () == MATCH_YES)
3907 /* If the case construct doesn't have a case-construct-name, we
3908 should have matched the EOS. */
3909 if (!gfc_current_block ())
3912 gfc_gobble_whitespace ();
3914 m = gfc_match_name (name);
3918 if (strcmp (name, gfc_current_block ()->name) != 0)
3920 gfc_error ("Expected block name '%s' of SELECT construct at %C",
3921 gfc_current_block ()->name);
3925 return gfc_match_eos ();
3929 /* Match a SELECT statement. */
3932 gfc_match_select (void)
3937 m = gfc_match_label ();
3938 if (m == MATCH_ERROR)
3941 m = gfc_match (" select case ( %e )%t", &expr);
3945 new_st.op = EXEC_SELECT;
3946 new_st.expr1 = expr;
3952 /* Push the current selector onto the SELECT TYPE stack. */
3955 select_type_push (gfc_symbol *sel)
3957 gfc_select_type_stack *top = gfc_get_select_type_stack ();
3958 top->selector = sel;
3960 top->prev = select_type_stack;
3962 select_type_stack = top;
3966 /* Set the temporary for the current SELECT TYPE selector. */
3969 select_type_set_tmp (gfc_typespec *ts)
3971 char name[GFC_MAX_SYMBOL_LEN];
3974 sprintf (name, "tmp$%s", ts->u.derived->name);
3975 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
3976 gfc_add_type (tmp->n.sym, ts, NULL);
3977 gfc_set_sym_referenced (tmp->n.sym);
3978 gfc_add_pointer (&tmp->n.sym->attr, NULL);
3979 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
3981 select_type_stack->tmp = tmp;
3985 /* Match a SELECT TYPE statement. */
3988 gfc_match_select_type (void)
3990 gfc_expr *expr1, *expr2 = NULL;
3992 char name[GFC_MAX_SYMBOL_LEN];
3994 m = gfc_match_label ();
3995 if (m == MATCH_ERROR)
3998 m = gfc_match (" select type ( ");
4002 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4004 m = gfc_match (" %n => %e", name, &expr2);
4007 expr1 = gfc_get_expr();
4008 expr1->expr_type = EXPR_VARIABLE;
4009 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4011 expr1->symtree->n.sym->ts = expr2->ts;
4012 expr1->symtree->n.sym->attr.referenced = 1;
4013 expr1->symtree->n.sym->attr.class_ok = 1;
4017 m = gfc_match (" %e ", &expr1);
4022 m = gfc_match (" )%t");
4026 /* Check for F03:C811. */
4027 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4029 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4030 "use associate-name=>");
4034 /* Check for F03:C813. */
4035 if (expr1->ts.type != BT_CLASS && !(expr2 && expr2->ts.type == BT_CLASS))
4037 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
4042 new_st.op = EXEC_SELECT_TYPE;
4043 new_st.expr1 = expr1;
4044 new_st.expr2 = expr2;
4045 new_st.ext.ns = gfc_current_ns;
4047 select_type_push (expr1->symtree->n.sym);
4053 /* Match a CASE statement. */
4056 gfc_match_case (void)
4058 gfc_case *c, *head, *tail;
4063 if (gfc_current_state () != COMP_SELECT)
4065 gfc_error ("Unexpected CASE statement at %C");
4069 if (gfc_match ("% default") == MATCH_YES)
4071 m = match_case_eos ();
4074 if (m == MATCH_ERROR)
4077 new_st.op = EXEC_SELECT;
4078 c = gfc_get_case ();
4079 c->where = gfc_current_locus;
4080 new_st.ext.case_list = c;
4084 if (gfc_match_char ('(') != MATCH_YES)
4089 if (match_case_selector (&c) == MATCH_ERROR)
4099 if (gfc_match_char (')') == MATCH_YES)
4101 if (gfc_match_char (',') != MATCH_YES)
4105 m = match_case_eos ();
4108 if (m == MATCH_ERROR)
4111 new_st.op = EXEC_SELECT;
4112 new_st.ext.case_list = head;
4117 gfc_error ("Syntax error in CASE specification at %C");
4120 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4125 /* Match a TYPE IS statement. */
4128 gfc_match_type_is (void)
4133 if (gfc_current_state () != COMP_SELECT_TYPE)
4135 gfc_error ("Unexpected TYPE IS statement at %C");
4139 if (gfc_match_char ('(') != MATCH_YES)
4142 c = gfc_get_case ();
4143 c->where = gfc_current_locus;
4145 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4146 match_type_spec here. */
4147 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4150 if (gfc_match_char (')') != MATCH_YES)
4153 m = match_case_eos ();
4156 if (m == MATCH_ERROR)
4159 new_st.op = EXEC_SELECT_TYPE;
4160 new_st.ext.case_list = c;
4162 /* Create temporary variable. */
4163 select_type_set_tmp (&c->ts);
4168 gfc_error ("Syntax error in TYPE IS specification at %C");
4172 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4177 /* Match a CLASS IS or CLASS DEFAULT statement. */
4180 gfc_match_class_is (void)
4185 if (gfc_current_state () != COMP_SELECT_TYPE)
4188 if (gfc_match ("% default") == MATCH_YES)
4190 m = match_case_eos ();
4193 if (m == MATCH_ERROR)
4196 new_st.op = EXEC_SELECT_TYPE;
4197 c = gfc_get_case ();
4198 c->where = gfc_current_locus;
4199 c->ts.type = BT_UNKNOWN;
4200 new_st.ext.case_list = c;
4204 m = gfc_match ("% is");
4207 if (m == MATCH_ERROR)
4210 if (gfc_match_char ('(') != MATCH_YES)
4213 c = gfc_get_case ();
4214 c->where = gfc_current_locus;
4216 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4219 if (c->ts.type == BT_DERIVED)
4220 c->ts.type = BT_CLASS;
4222 if (gfc_match_char (')') != MATCH_YES)
4225 m = match_case_eos ();
4228 if (m == MATCH_ERROR)
4231 new_st.op = EXEC_SELECT_TYPE;
4232 new_st.ext.case_list = c;
4234 gfc_error_now ("CLASS IS specification at %C is not yet supported");
4239 gfc_error ("Syntax error in CLASS IS specification at %C");
4243 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4248 /********************* WHERE subroutines ********************/
4250 /* Match the rest of a simple WHERE statement that follows an IF statement.
4254 match_simple_where (void)
4260 m = gfc_match (" ( %e )", &expr);
4264 m = gfc_match_assignment ();
4267 if (m == MATCH_ERROR)
4270 if (gfc_match_eos () != MATCH_YES)
4273 c = gfc_get_code ();
4277 c->next = gfc_get_code ();
4280 gfc_clear_new_st ();
4282 new_st.op = EXEC_WHERE;
4288 gfc_syntax_error (ST_WHERE);
4291 gfc_free_expr (expr);
4296 /* Match a WHERE statement. */
4299 gfc_match_where (gfc_statement *st)
4305 m0 = gfc_match_label ();
4306 if (m0 == MATCH_ERROR)
4309 m = gfc_match (" where ( %e )", &expr);
4313 if (gfc_match_eos () == MATCH_YES)
4315 *st = ST_WHERE_BLOCK;
4316 new_st.op = EXEC_WHERE;
4317 new_st.expr1 = expr;
4321 m = gfc_match_assignment ();
4323 gfc_syntax_error (ST_WHERE);
4327 gfc_free_expr (expr);
4331 /* We've got a simple WHERE statement. */
4333 c = gfc_get_code ();
4337 c->next = gfc_get_code ();
4340 gfc_clear_new_st ();
4342 new_st.op = EXEC_WHERE;
4349 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4350 new_st if successful. */
4353 gfc_match_elsewhere (void)
4355 char name[GFC_MAX_SYMBOL_LEN + 1];
4359 if (gfc_current_state () != COMP_WHERE)
4361 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4367 if (gfc_match_char ('(') == MATCH_YES)
4369 m = gfc_match_expr (&expr);
4372 if (m == MATCH_ERROR)
4375 if (gfc_match_char (')') != MATCH_YES)
4379 if (gfc_match_eos () != MATCH_YES)
4381 /* Only makes sense if we have a where-construct-name. */
4382 if (!gfc_current_block ())
4387 /* Better be a name at this point. */
4388 m = gfc_match_name (name);
4391 if (m == MATCH_ERROR)
4394 if (gfc_match_eos () != MATCH_YES)
4397 if (strcmp (name, gfc_current_block ()->name) != 0)
4399 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4400 name, gfc_current_block ()->name);
4405 new_st.op = EXEC_WHERE;
4406 new_st.expr1 = expr;
4410 gfc_syntax_error (ST_ELSEWHERE);
4413 gfc_free_expr (expr);
4418 /******************** FORALL subroutines ********************/
4420 /* Free a list of FORALL iterators. */
4423 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4425 gfc_forall_iterator *next;
4430 gfc_free_expr (iter->var);
4431 gfc_free_expr (iter->start);
4432 gfc_free_expr (iter->end);
4433 gfc_free_expr (iter->stride);
4440 /* Match an iterator as part of a FORALL statement. The format is:
4442 <var> = <start>:<end>[:<stride>]
4444 On MATCH_NO, the caller tests for the possibility that there is a
4445 scalar mask expression. */
4448 match_forall_iterator (gfc_forall_iterator **result)
4450 gfc_forall_iterator *iter;
4454 where = gfc_current_locus;
4455 iter = XCNEW (gfc_forall_iterator);
4457 m = gfc_match_expr (&iter->var);
4461 if (gfc_match_char ('=') != MATCH_YES
4462 || iter->var->expr_type != EXPR_VARIABLE)
4468 m = gfc_match_expr (&iter->start);
4472 if (gfc_match_char (':') != MATCH_YES)
4475 m = gfc_match_expr (&iter->end);
4478 if (m == MATCH_ERROR)
4481 if (gfc_match_char (':') == MATCH_NO)
4482 iter->stride = gfc_int_expr (1);
4485 m = gfc_match_expr (&iter->stride);
4488 if (m == MATCH_ERROR)
4492 /* Mark the iteration variable's symbol as used as a FORALL index. */
4493 iter->var->symtree->n.sym->forall_index = true;
4499 gfc_error ("Syntax error in FORALL iterator at %C");
4504 gfc_current_locus = where;
4505 gfc_free_forall_iterator (iter);
4510 /* Match the header of a FORALL statement. */
4513 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
4515 gfc_forall_iterator *head, *tail, *new_iter;
4519 gfc_gobble_whitespace ();
4524 if (gfc_match_char ('(') != MATCH_YES)
4527 m = match_forall_iterator (&new_iter);
4528 if (m == MATCH_ERROR)
4533 head = tail = new_iter;
4537 if (gfc_match_char (',') != MATCH_YES)
4540 m = match_forall_iterator (&new_iter);
4541 if (m == MATCH_ERROR)
4546 tail->next = new_iter;
4551 /* Have to have a mask expression. */
4553 m = gfc_match_expr (&msk);
4556 if (m == MATCH_ERROR)
4562 if (gfc_match_char (')') == MATCH_NO)
4570 gfc_syntax_error (ST_FORALL);
4573 gfc_free_expr (msk);
4574 gfc_free_forall_iterator (head);
4579 /* Match the rest of a simple FORALL statement that follows an
4583 match_simple_forall (void)
4585 gfc_forall_iterator *head;
4594 m = match_forall_header (&head, &mask);
4601 m = gfc_match_assignment ();
4603 if (m == MATCH_ERROR)
4607 m = gfc_match_pointer_assignment ();
4608 if (m == MATCH_ERROR)
4614 c = gfc_get_code ();
4616 c->loc = gfc_current_locus;
4618 if (gfc_match_eos () != MATCH_YES)
4621 gfc_clear_new_st ();
4622 new_st.op = EXEC_FORALL;
4623 new_st.expr1 = mask;
4624 new_st.ext.forall_iterator = head;
4625 new_st.block = gfc_get_code ();
4627 new_st.block->op = EXEC_FORALL;
4628 new_st.block->next = c;
4633 gfc_syntax_error (ST_FORALL);
4636 gfc_free_forall_iterator (head);
4637 gfc_free_expr (mask);
4643 /* Match a FORALL statement. */
4646 gfc_match_forall (gfc_statement *st)
4648 gfc_forall_iterator *head;
4657 m0 = gfc_match_label ();
4658 if (m0 == MATCH_ERROR)
4661 m = gfc_match (" forall");
4665 m = match_forall_header (&head, &mask);
4666 if (m == MATCH_ERROR)
4671 if (gfc_match_eos () == MATCH_YES)
4673 *st = ST_FORALL_BLOCK;
4674 new_st.op = EXEC_FORALL;
4675 new_st.expr1 = mask;
4676 new_st.ext.forall_iterator = head;
4680 m = gfc_match_assignment ();
4681 if (m == MATCH_ERROR)
4685 m = gfc_match_pointer_assignment ();
4686 if (m == MATCH_ERROR)
4692 c = gfc_get_code ();
4694 c->loc = gfc_current_locus;
4696 gfc_clear_new_st ();
4697 new_st.op = EXEC_FORALL;
4698 new_st.expr1 = mask;
4699 new_st.ext.forall_iterator = head;
4700 new_st.block = gfc_get_code ();
4701 new_st.block->op = EXEC_FORALL;
4702 new_st.block->next = c;
4708 gfc_syntax_error (ST_FORALL);
4711 gfc_free_forall_iterator (head);
4712 gfc_free_expr (mask);
4713 gfc_free_statements (c);