1 /* Matching subroutines in all sizes, shapes and colors.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 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 ("error stop", gfc_match_error_stop, ST_ERROR_STOP)
1551 match ("exit", gfc_match_exit, ST_EXIT)
1552 match ("flush", gfc_match_flush, ST_FLUSH)
1553 match ("forall", match_simple_forall, ST_FORALL)
1554 match ("go to", gfc_match_goto, ST_GOTO)
1555 match ("if", match_arithmetic_if, ST_ARITHMETIC_IF)
1556 match ("inquire", gfc_match_inquire, ST_INQUIRE)
1557 match ("nullify", gfc_match_nullify, ST_NULLIFY)
1558 match ("open", gfc_match_open, ST_OPEN)
1559 match ("pause", gfc_match_pause, ST_NONE)
1560 match ("print", gfc_match_print, ST_WRITE)
1561 match ("read", gfc_match_read, ST_READ)
1562 match ("return", gfc_match_return, ST_RETURN)
1563 match ("rewind", gfc_match_rewind, ST_REWIND)
1564 match ("stop", gfc_match_stop, ST_STOP)
1565 match ("wait", gfc_match_wait, ST_WAIT)
1566 match ("sync all", gfc_match_sync_all, ST_SYNC_CALL);
1567 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
1568 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
1569 match ("where", match_simple_where, ST_WHERE)
1570 match ("write", gfc_match_write, ST_WRITE)
1572 /* The gfc_match_assignment() above may have returned a MATCH_NO
1573 where the assignment was to a named constant. Check that
1574 special case here. */
1575 m = gfc_match_assignment ();
1578 gfc_error ("Cannot assign to a named constant at %C");
1579 gfc_free_expr (expr);
1580 gfc_undo_symbols ();
1581 gfc_current_locus = old_loc;
1585 /* All else has failed, so give up. See if any of the matchers has
1586 stored an error message of some sort. */
1587 if (gfc_error_check () == 0)
1588 gfc_error ("Unclassifiable statement in IF-clause at %C");
1590 gfc_free_expr (expr);
1595 gfc_error ("Syntax error in IF-clause at %C");
1598 gfc_free_expr (expr);
1602 /* At this point, we've matched the single IF and the action clause
1603 is in new_st. Rearrange things so that the IF statement appears
1606 p = gfc_get_code ();
1607 p->next = gfc_get_code ();
1609 p->next->loc = gfc_current_locus;
1614 gfc_clear_new_st ();
1616 new_st.op = EXEC_IF;
1625 /* Match an ELSE statement. */
1628 gfc_match_else (void)
1630 char name[GFC_MAX_SYMBOL_LEN + 1];
1632 if (gfc_match_eos () == MATCH_YES)
1635 if (gfc_match_name (name) != MATCH_YES
1636 || gfc_current_block () == NULL
1637 || gfc_match_eos () != MATCH_YES)
1639 gfc_error ("Unexpected junk after ELSE statement at %C");
1643 if (strcmp (name, gfc_current_block ()->name) != 0)
1645 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1646 name, gfc_current_block ()->name);
1654 /* Match an ELSE IF statement. */
1657 gfc_match_elseif (void)
1659 char name[GFC_MAX_SYMBOL_LEN + 1];
1663 m = gfc_match (" ( %e ) then", &expr);
1667 if (gfc_match_eos () == MATCH_YES)
1670 if (gfc_match_name (name) != MATCH_YES
1671 || gfc_current_block () == NULL
1672 || gfc_match_eos () != MATCH_YES)
1674 gfc_error ("Unexpected junk after ELSE IF statement at %C");
1678 if (strcmp (name, gfc_current_block ()->name) != 0)
1680 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1681 name, gfc_current_block ()->name);
1686 new_st.op = EXEC_IF;
1687 new_st.expr1 = expr;
1691 gfc_free_expr (expr);
1696 /* Free a gfc_iterator structure. */
1699 gfc_free_iterator (gfc_iterator *iter, int flag)
1705 gfc_free_expr (iter->var);
1706 gfc_free_expr (iter->start);
1707 gfc_free_expr (iter->end);
1708 gfc_free_expr (iter->step);
1715 /* Match a CRITICAL statement. */
1717 gfc_match_critical (void)
1719 gfc_st_label *label = NULL;
1721 if (gfc_match_label () == MATCH_ERROR)
1724 if (gfc_match (" critical") != MATCH_YES)
1727 if (gfc_match_st_label (&label) == MATCH_ERROR)
1730 if (gfc_match_eos () != MATCH_YES)
1732 gfc_syntax_error (ST_CRITICAL);
1736 if (gfc_pure (NULL))
1738 gfc_error ("Image control statement CRITICAL at %C in PURE procedure");
1742 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CRITICAL statement at %C")
1746 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
1748 gfc_error ("Nested CRITICAL block at %C");
1752 new_st.op = EXEC_CRITICAL;
1755 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1762 /* Match a BLOCK statement. */
1765 gfc_match_block (void)
1769 if (gfc_match_label () == MATCH_ERROR)
1772 if (gfc_match (" block") != MATCH_YES)
1775 /* For this to be a correct BLOCK statement, the line must end now. */
1776 m = gfc_match_eos ();
1777 if (m == MATCH_ERROR)
1786 /* Match a DO statement. */
1791 gfc_iterator iter, *ip;
1793 gfc_st_label *label;
1796 old_loc = gfc_current_locus;
1799 iter.var = iter.start = iter.end = iter.step = NULL;
1801 m = gfc_match_label ();
1802 if (m == MATCH_ERROR)
1805 if (gfc_match (" do") != MATCH_YES)
1808 m = gfc_match_st_label (&label);
1809 if (m == MATCH_ERROR)
1812 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1814 if (gfc_match_eos () == MATCH_YES)
1816 iter.end = gfc_logical_expr (1, NULL);
1817 new_st.op = EXEC_DO_WHILE;
1821 /* Match an optional comma, if no comma is found, a space is obligatory. */
1822 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1825 /* Check for balanced parens. */
1827 if (gfc_match_parens () == MATCH_ERROR)
1830 /* See if we have a DO WHILE. */
1831 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1833 new_st.op = EXEC_DO_WHILE;
1837 /* The abortive DO WHILE may have done something to the symbol
1838 table, so we start over. */
1839 gfc_undo_symbols ();
1840 gfc_current_locus = old_loc;
1842 gfc_match_label (); /* This won't error. */
1843 gfc_match (" do "); /* This will work. */
1845 gfc_match_st_label (&label); /* Can't error out. */
1846 gfc_match_char (','); /* Optional comma. */
1848 m = gfc_match_iterator (&iter, 0);
1851 if (m == MATCH_ERROR)
1854 iter.var->symtree->n.sym->attr.implied_index = 0;
1855 gfc_check_do_variable (iter.var->symtree);
1857 if (gfc_match_eos () != MATCH_YES)
1859 gfc_syntax_error (ST_DO);
1863 new_st.op = EXEC_DO;
1867 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1870 new_st.label1 = label;
1872 if (new_st.op == EXEC_DO_WHILE)
1873 new_st.expr1 = iter.end;
1876 new_st.ext.iterator = ip = gfc_get_iterator ();
1883 gfc_free_iterator (&iter, 0);
1889 /* Match an EXIT or CYCLE statement. */
1892 match_exit_cycle (gfc_statement st, gfc_exec_op op)
1894 gfc_state_data *p, *o;
1898 if (gfc_match_eos () == MATCH_YES)
1902 m = gfc_match ("% %s%t", &sym);
1903 if (m == MATCH_ERROR)
1907 gfc_syntax_error (st);
1911 if (sym->attr.flavor != FL_LABEL)
1913 gfc_error ("Name '%s' in %s statement at %C is not a loop name",
1914 sym->name, gfc_ascii_statement (st));
1919 /* Find the loop mentioned specified by the label (or lack of a label). */
1920 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
1921 if (p->state == COMP_DO && (sym == NULL || sym == p->sym))
1923 else if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
1925 else if (p->state == COMP_CRITICAL)
1927 gfc_error("%s statement at %C leaves CRITICAL construct",
1928 gfc_ascii_statement (st));
1935 gfc_error ("%s statement at %C is not within a loop",
1936 gfc_ascii_statement (st));
1938 gfc_error ("%s statement at %C is not within loop '%s'",
1939 gfc_ascii_statement (st), sym->name);
1946 gfc_error ("%s statement at %C leaving OpenMP structured block",
1947 gfc_ascii_statement (st));
1950 else if (st == ST_EXIT
1951 && p->previous != NULL
1952 && p->previous->state == COMP_OMP_STRUCTURED_BLOCK
1953 && (p->previous->head->op == EXEC_OMP_DO
1954 || p->previous->head->op == EXEC_OMP_PARALLEL_DO))
1956 gcc_assert (p->previous->head->next != NULL);
1957 gcc_assert (p->previous->head->next->op == EXEC_DO
1958 || p->previous->head->next->op == EXEC_DO_WHILE);
1959 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
1963 /* Save the first statement in the loop - needed by the backend. */
1964 new_st.ext.whichloop = p->head;
1972 /* Match the EXIT statement. */
1975 gfc_match_exit (void)
1977 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
1981 /* Match the CYCLE statement. */
1984 gfc_match_cycle (void)
1986 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
1990 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
1993 gfc_match_stopcode (gfc_statement st)
2003 if (gfc_match_eos () != MATCH_YES)
2005 m = gfc_match_small_literal_int (&stop_code, &cnt);
2006 if (m == MATCH_ERROR)
2009 if (m == MATCH_YES && cnt > 5)
2011 gfc_error ("Too many digits in STOP code at %C");
2017 /* Try a character constant. */
2018 m = gfc_match_expr (&e);
2019 if (m == MATCH_ERROR)
2023 if (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_CONSTANT)
2027 if (gfc_match_eos () != MATCH_YES)
2031 if (gfc_pure (NULL))
2033 gfc_error ("%s statement not allowed in PURE procedure at %C",
2034 gfc_ascii_statement (st));
2038 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2040 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2047 new_st.op = EXEC_STOP;
2050 new_st.op = EXEC_ERROR_STOP;
2053 new_st.op = EXEC_PAUSE;
2060 new_st.ext.stop_code = stop_code;
2065 gfc_syntax_error (st);
2074 /* Match the (deprecated) PAUSE statement. */
2077 gfc_match_pause (void)
2081 m = gfc_match_stopcode (ST_PAUSE);
2084 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2093 /* Match the STOP statement. */
2096 gfc_match_stop (void)
2098 return gfc_match_stopcode (ST_STOP);
2102 /* Match the ERROR STOP statement. */
2105 gfc_match_error_stop (void)
2107 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2111 return gfc_match_stopcode (ST_ERROR_STOP);
2115 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2116 SYNC ALL [(sync-stat-list)]
2117 SYNC MEMORY [(sync-stat-list)]
2118 SYNC IMAGES (image-set [, sync-stat-list] )
2119 with sync-stat is int-expr or *. */
2122 sync_statement (gfc_statement st)
2125 gfc_expr *tmp, *imageset, *stat, *errmsg;
2126 bool saw_stat, saw_errmsg;
2128 tmp = imageset = stat = errmsg = NULL;
2129 saw_stat = saw_errmsg = false;
2131 if (gfc_pure (NULL))
2133 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2137 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2141 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2143 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2147 if (gfc_match_eos () == MATCH_YES)
2149 if (st == ST_SYNC_IMAGES)
2154 if (gfc_match_char ('(') != MATCH_YES)
2157 if (st == ST_SYNC_IMAGES)
2159 /* Denote '*' as imageset == NULL. */
2160 m = gfc_match_char ('*');
2161 if (m == MATCH_ERROR)
2165 if (gfc_match ("%e", &imageset) != MATCH_YES)
2168 m = gfc_match_char (',');
2169 if (m == MATCH_ERROR)
2173 m = gfc_match_char (')');
2182 m = gfc_match (" stat = %v", &tmp);
2183 if (m == MATCH_ERROR)
2189 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2195 if (gfc_match_char (',') == MATCH_YES)
2199 m = gfc_match (" errmsg = %v", &tmp);
2200 if (m == MATCH_ERROR)
2206 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2212 if (gfc_match_char (',') == MATCH_YES)
2216 gfc_gobble_whitespace ();
2218 if (gfc_peek_char () == ')')
2224 if (gfc_match (" )%t") != MATCH_YES)
2231 new_st.op = EXEC_SYNC_ALL;
2233 case ST_SYNC_IMAGES:
2234 new_st.op = EXEC_SYNC_IMAGES;
2236 case ST_SYNC_MEMORY:
2237 new_st.op = EXEC_SYNC_MEMORY;
2243 new_st.expr1 = imageset;
2244 new_st.expr2 = stat;
2245 new_st.expr3 = errmsg;
2250 gfc_syntax_error (st);
2253 gfc_free_expr (tmp);
2254 gfc_free_expr (imageset);
2255 gfc_free_expr (stat);
2256 gfc_free_expr (errmsg);
2262 /* Match SYNC ALL statement. */
2265 gfc_match_sync_all (void)
2267 return sync_statement (ST_SYNC_ALL);
2271 /* Match SYNC IMAGES statement. */
2274 gfc_match_sync_images (void)
2276 return sync_statement (ST_SYNC_IMAGES);
2280 /* Match SYNC MEMORY statement. */
2283 gfc_match_sync_memory (void)
2285 return sync_statement (ST_SYNC_MEMORY);
2289 /* Match a CONTINUE statement. */
2292 gfc_match_continue (void)
2294 if (gfc_match_eos () != MATCH_YES)
2296 gfc_syntax_error (ST_CONTINUE);
2300 new_st.op = EXEC_CONTINUE;
2305 /* Match the (deprecated) ASSIGN statement. */
2308 gfc_match_assign (void)
2311 gfc_st_label *label;
2313 if (gfc_match (" %l", &label) == MATCH_YES)
2315 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2317 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2319 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2324 expr->symtree->n.sym->attr.assign = 1;
2326 new_st.op = EXEC_LABEL_ASSIGN;
2327 new_st.label1 = label;
2328 new_st.expr1 = expr;
2336 /* Match the GO TO statement. As a computed GOTO statement is
2337 matched, it is transformed into an equivalent SELECT block. No
2338 tree is necessary, and the resulting jumps-to-jumps are
2339 specifically optimized away by the back end. */
2342 gfc_match_goto (void)
2344 gfc_code *head, *tail;
2347 gfc_st_label *label;
2351 if (gfc_match (" %l%t", &label) == MATCH_YES)
2353 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2356 new_st.op = EXEC_GOTO;
2357 new_st.label1 = label;
2361 /* The assigned GO TO statement. */
2363 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2365 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2370 new_st.op = EXEC_GOTO;
2371 new_st.expr1 = expr;
2373 if (gfc_match_eos () == MATCH_YES)
2376 /* Match label list. */
2377 gfc_match_char (',');
2378 if (gfc_match_char ('(') != MATCH_YES)
2380 gfc_syntax_error (ST_GOTO);
2387 m = gfc_match_st_label (&label);
2391 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2395 head = tail = gfc_get_code ();
2398 tail->block = gfc_get_code ();
2402 tail->label1 = label;
2403 tail->op = EXEC_GOTO;
2405 while (gfc_match_char (',') == MATCH_YES);
2407 if (gfc_match (")%t") != MATCH_YES)
2412 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2415 new_st.block = head;
2420 /* Last chance is a computed GO TO statement. */
2421 if (gfc_match_char ('(') != MATCH_YES)
2423 gfc_syntax_error (ST_GOTO);
2432 m = gfc_match_st_label (&label);
2436 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2440 head = tail = gfc_get_code ();
2443 tail->block = gfc_get_code ();
2447 cp = gfc_get_case ();
2448 cp->low = cp->high = gfc_int_expr (i++);
2450 tail->op = EXEC_SELECT;
2451 tail->ext.case_list = cp;
2453 tail->next = gfc_get_code ();
2454 tail->next->op = EXEC_GOTO;
2455 tail->next->label1 = label;
2457 while (gfc_match_char (',') == MATCH_YES);
2459 if (gfc_match_char (')') != MATCH_YES)
2464 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2468 /* Get the rest of the statement. */
2469 gfc_match_char (',');
2471 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2474 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2475 "at %C") == FAILURE)
2478 /* At this point, a computed GOTO has been fully matched and an
2479 equivalent SELECT statement constructed. */
2481 new_st.op = EXEC_SELECT;
2482 new_st.expr1 = NULL;
2484 /* Hack: For a "real" SELECT, the expression is in expr. We put
2485 it in expr2 so we can distinguish then and produce the correct
2487 new_st.expr2 = expr;
2488 new_st.block = head;
2492 gfc_syntax_error (ST_GOTO);
2494 gfc_free_statements (head);
2499 /* Frees a list of gfc_alloc structures. */
2502 gfc_free_alloc_list (gfc_alloc *p)
2509 gfc_free_expr (p->expr);
2515 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2516 an accessible derived type. */
2519 match_derived_type_spec (gfc_typespec *ts)
2522 gfc_symbol *derived;
2524 old_locus = gfc_current_locus;
2526 if (gfc_match_symbol (&derived, 1) == MATCH_YES)
2528 if (derived->attr.flavor == FL_DERIVED)
2530 ts->type = BT_DERIVED;
2531 ts->u.derived = derived;
2536 /* Enforce F03:C476. */
2537 gfc_error ("'%s' at %L is not an accessible derived type",
2538 derived->name, &gfc_current_locus);
2543 gfc_current_locus = old_locus;
2548 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2549 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2550 It only includes the intrinsic types from the Fortran 2003 standard
2551 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2552 the implicit_flag is not needed, so it was removed. Derived types are
2553 identified by their name alone. */
2556 match_type_spec (gfc_typespec *ts)
2562 old_locus = gfc_current_locus;
2564 if (gfc_match ("integer") == MATCH_YES)
2566 ts->type = BT_INTEGER;
2567 ts->kind = gfc_default_integer_kind;
2571 if (gfc_match ("real") == MATCH_YES)
2574 ts->kind = gfc_default_real_kind;
2578 if (gfc_match ("double precision") == MATCH_YES)
2581 ts->kind = gfc_default_double_kind;
2585 if (gfc_match ("complex") == MATCH_YES)
2587 ts->type = BT_COMPLEX;
2588 ts->kind = gfc_default_complex_kind;
2592 if (gfc_match ("character") == MATCH_YES)
2594 ts->type = BT_CHARACTER;
2598 if (gfc_match ("logical") == MATCH_YES)
2600 ts->type = BT_LOGICAL;
2601 ts->kind = gfc_default_logical_kind;
2605 m = match_derived_type_spec (ts);
2608 old_locus = gfc_current_locus;
2609 if (gfc_match (" :: ") != MATCH_YES)
2611 gfc_current_locus = old_locus;
2612 /* Enfore F03:C401. */
2613 if (ts->u.derived->attr.abstract)
2615 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2616 ts->u.derived->name, &old_locus);
2621 else if (m == MATCH_ERROR && gfc_match (" :: ") == MATCH_YES)
2624 /* If a type is not matched, simply return MATCH_NO. */
2625 gfc_current_locus = old_locus;
2630 gfc_gobble_whitespace ();
2631 if (gfc_peek_ascii_char () == '*')
2633 gfc_error ("Invalid type-spec at %C");
2637 m = gfc_match_kind_spec (ts, false);
2640 m = MATCH_YES; /* No kind specifier found. */
2646 m = gfc_match_char_spec (ts);
2649 m = MATCH_YES; /* No kind specifier found. */
2655 /* Match an ALLOCATE statement. */
2658 gfc_match_allocate (void)
2660 gfc_alloc *head, *tail;
2661 gfc_expr *stat, *errmsg, *tmp, *source;
2666 bool saw_stat, saw_errmsg, saw_source, b1, b2, b3;
2669 stat = errmsg = source = tmp = NULL;
2670 saw_stat = saw_errmsg = saw_source = false;
2672 if (gfc_match_char ('(') != MATCH_YES)
2675 /* Match an optional type-spec. */
2676 old_locus = gfc_current_locus;
2677 m = match_type_spec (&ts);
2678 if (m == MATCH_ERROR)
2680 else if (m == MATCH_NO)
2681 ts.type = BT_UNKNOWN;
2684 if (gfc_match (" :: ") == MATCH_YES)
2686 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2687 "ALLOCATE at %L", &old_locus) == FAILURE)
2692 ts.type = BT_UNKNOWN;
2693 gfc_current_locus = old_locus;
2700 head = tail = gfc_get_alloc ();
2703 tail->next = gfc_get_alloc ();
2707 m = gfc_match_variable (&tail->expr, 0);
2710 if (m == MATCH_ERROR)
2713 if (gfc_check_do_variable (tail->expr->symtree))
2716 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2718 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2722 /* The ALLOCATE statement had an optional typespec. Check the
2724 if (ts.type != BT_UNKNOWN)
2726 /* Enforce F03:C624. */
2727 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2729 gfc_error ("Type of entity at %L is type incompatible with "
2730 "typespec", &tail->expr->where);
2734 /* Enforce F03:C627. */
2735 if (ts.kind != tail->expr->ts.kind)
2737 gfc_error ("Kind type parameter for entity at %L differs from "
2738 "the kind type parameter of the typespec",
2739 &tail->expr->where);
2744 if (tail->expr->ts.type == BT_DERIVED)
2745 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2747 /* FIXME: disable the checking on derived types and arrays. */
2748 sym = tail->expr->symtree->n.sym;
2749 b1 = !(tail->expr->ref
2750 && (tail->expr->ref->type == REF_COMPONENT
2751 || tail->expr->ref->type == REF_ARRAY));
2752 if (sym && sym->ts.type == BT_CLASS)
2753 b2 = !(sym->ts.u.derived->components->attr.allocatable
2754 || sym->ts.u.derived->components->attr.pointer);
2756 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2757 || sym->attr.proc_pointer);
2758 b3 = sym && sym->ns && sym->ns->proc_name
2759 && (sym->ns->proc_name->attr.allocatable
2760 || sym->ns->proc_name->attr.pointer
2761 || sym->ns->proc_name->attr.proc_pointer);
2762 if (b1 && b2 && !b3)
2764 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
2765 "or an allocatable variable");
2769 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2771 gfc_error ("Shape specification for allocatable scalar at %C");
2775 if (gfc_match_char (',') != MATCH_YES)
2780 m = gfc_match (" stat = %v", &tmp);
2781 if (m == MATCH_ERROR)
2788 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2795 if (gfc_check_do_variable (stat->symtree))
2798 if (gfc_match_char (',') == MATCH_YES)
2799 goto alloc_opt_list;
2802 m = gfc_match (" errmsg = %v", &tmp);
2803 if (m == MATCH_ERROR)
2807 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
2808 &tmp->where) == FAILURE)
2814 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2821 if (gfc_match_char (',') == MATCH_YES)
2822 goto alloc_opt_list;
2825 m = gfc_match (" source = %e", &tmp);
2826 if (m == MATCH_ERROR)
2830 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
2831 &tmp->where) == FAILURE)
2837 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
2841 /* The next 2 conditionals check C631. */
2842 if (ts.type != BT_UNKNOWN)
2844 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
2845 &tmp->where, &old_locus);
2851 gfc_error ("SOURCE tag at %L requires only a single entity in "
2852 "the allocation-list", &tmp->where);
2859 if (gfc_match_char (',') == MATCH_YES)
2860 goto alloc_opt_list;
2863 gfc_gobble_whitespace ();
2865 if (gfc_peek_char () == ')')
2870 if (gfc_match (" )%t") != MATCH_YES)
2873 new_st.op = EXEC_ALLOCATE;
2874 new_st.expr1 = stat;
2875 new_st.expr2 = errmsg;
2876 new_st.expr3 = source;
2877 new_st.ext.alloc.list = head;
2878 new_st.ext.alloc.ts = ts;
2883 gfc_syntax_error (ST_ALLOCATE);
2886 gfc_free_expr (errmsg);
2887 gfc_free_expr (source);
2888 gfc_free_expr (stat);
2889 gfc_free_expr (tmp);
2890 gfc_free_alloc_list (head);
2895 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
2896 a set of pointer assignments to intrinsic NULL(). */
2899 gfc_match_nullify (void)
2907 if (gfc_match_char ('(') != MATCH_YES)
2912 m = gfc_match_variable (&p, 0);
2913 if (m == MATCH_ERROR)
2918 if (gfc_check_do_variable (p->symtree))
2921 if (gfc_pure (NULL) && gfc_impure_variable (p->symtree->n.sym))
2923 gfc_error ("Illegal variable in NULLIFY at %C for a PURE procedure");
2927 /* build ' => NULL() '. */
2928 e = gfc_get_expr ();
2929 e->where = gfc_current_locus;
2930 e->expr_type = EXPR_NULL;
2931 e->ts.type = BT_UNKNOWN;
2933 /* Chain to list. */
2938 tail->next = gfc_get_code ();
2942 tail->op = EXEC_POINTER_ASSIGN;
2946 if (gfc_match (" )%t") == MATCH_YES)
2948 if (gfc_match_char (',') != MATCH_YES)
2955 gfc_syntax_error (ST_NULLIFY);
2958 gfc_free_statements (new_st.next);
2960 gfc_free_expr (new_st.expr1);
2961 new_st.expr1 = NULL;
2962 gfc_free_expr (new_st.expr2);
2963 new_st.expr2 = NULL;
2968 /* Match a DEALLOCATE statement. */
2971 gfc_match_deallocate (void)
2973 gfc_alloc *head, *tail;
2974 gfc_expr *stat, *errmsg, *tmp;
2977 bool saw_stat, saw_errmsg, b1, b2;
2980 stat = errmsg = tmp = NULL;
2981 saw_stat = saw_errmsg = false;
2983 if (gfc_match_char ('(') != MATCH_YES)
2989 head = tail = gfc_get_alloc ();
2992 tail->next = gfc_get_alloc ();
2996 m = gfc_match_variable (&tail->expr, 0);
2997 if (m == MATCH_ERROR)
3002 if (gfc_check_do_variable (tail->expr->symtree))
3005 sym = tail->expr->symtree->n.sym;
3007 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3009 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3013 /* FIXME: disable the checking on derived types. */
3014 b1 = !(tail->expr->ref
3015 && (tail->expr->ref->type == REF_COMPONENT
3016 || tail->expr->ref->type == REF_ARRAY));
3017 if (sym && sym->ts.type == BT_CLASS)
3018 b2 = !(sym->ts.u.derived->components->attr.allocatable
3019 || sym->ts.u.derived->components->attr.pointer);
3021 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3022 || sym->attr.proc_pointer);
3025 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3026 "or an allocatable variable");
3030 if (gfc_match_char (',') != MATCH_YES)
3035 m = gfc_match (" stat = %v", &tmp);
3036 if (m == MATCH_ERROR)
3042 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3043 gfc_free_expr (tmp);
3050 if (gfc_check_do_variable (stat->symtree))
3053 if (gfc_match_char (',') == MATCH_YES)
3054 goto dealloc_opt_list;
3057 m = gfc_match (" errmsg = %v", &tmp);
3058 if (m == MATCH_ERROR)
3062 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3063 &tmp->where) == FAILURE)
3068 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3069 gfc_free_expr (tmp);
3076 if (gfc_match_char (',') == MATCH_YES)
3077 goto dealloc_opt_list;
3080 gfc_gobble_whitespace ();
3082 if (gfc_peek_char () == ')')
3086 if (gfc_match (" )%t") != MATCH_YES)
3089 new_st.op = EXEC_DEALLOCATE;
3090 new_st.expr1 = stat;
3091 new_st.expr2 = errmsg;
3092 new_st.ext.alloc.list = head;
3097 gfc_syntax_error (ST_DEALLOCATE);
3100 gfc_free_expr (errmsg);
3101 gfc_free_expr (stat);
3102 gfc_free_alloc_list (head);
3107 /* Match a RETURN statement. */
3110 gfc_match_return (void)
3114 gfc_compile_state s;
3118 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3120 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3124 if (gfc_match_eos () == MATCH_YES)
3127 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3129 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3134 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3135 "at %C") == FAILURE)
3138 if (gfc_current_form == FORM_FREE)
3140 /* The following are valid, so we can't require a blank after the
3144 char c = gfc_peek_ascii_char ();
3145 if (ISALPHA (c) || ISDIGIT (c))
3149 m = gfc_match (" %e%t", &e);
3152 if (m == MATCH_ERROR)
3155 gfc_syntax_error (ST_RETURN);
3162 gfc_enclosing_unit (&s);
3163 if (s == COMP_PROGRAM
3164 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3165 "main program at %C") == FAILURE)
3168 new_st.op = EXEC_RETURN;
3175 /* Match the call of a type-bound procedure, if CALL%var has already been
3176 matched and var found to be a derived-type variable. */
3179 match_typebound_call (gfc_symtree* varst)
3184 base = gfc_get_expr ();
3185 base->expr_type = EXPR_VARIABLE;
3186 base->symtree = varst;
3187 base->where = gfc_current_locus;
3188 gfc_set_sym_referenced (varst->n.sym);
3190 m = gfc_match_varspec (base, 0, true, true);
3192 gfc_error ("Expected component reference at %C");
3196 if (gfc_match_eos () != MATCH_YES)
3198 gfc_error ("Junk after CALL at %C");
3202 if (base->expr_type == EXPR_COMPCALL)
3203 new_st.op = EXEC_COMPCALL;
3204 else if (base->expr_type == EXPR_PPC)
3205 new_st.op = EXEC_CALL_PPC;
3208 gfc_error ("Expected type-bound procedure or procedure pointer component "
3212 new_st.expr1 = base;
3218 /* Match a CALL statement. The tricky part here are possible
3219 alternate return specifiers. We handle these by having all
3220 "subroutines" actually return an integer via a register that gives
3221 the return number. If the call specifies alternate returns, we
3222 generate code for a SELECT statement whose case clauses contain
3223 GOTOs to the various labels. */
3226 gfc_match_call (void)
3228 char name[GFC_MAX_SYMBOL_LEN + 1];
3229 gfc_actual_arglist *a, *arglist;
3239 m = gfc_match ("% %n", name);
3245 if (gfc_get_ha_sym_tree (name, &st))
3250 /* If this is a variable of derived-type, it probably starts a type-bound
3252 if ((sym->attr.flavor != FL_PROCEDURE
3253 || gfc_is_function_return_value (sym, gfc_current_ns))
3254 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3255 return match_typebound_call (st);
3257 /* If it does not seem to be callable (include functions so that the
3258 right association is made. They are thrown out in resolution.)
3260 if (!sym->attr.generic
3261 && !sym->attr.subroutine
3262 && !sym->attr.function)
3264 if (!(sym->attr.external && !sym->attr.referenced))
3266 /* ...create a symbol in this scope... */
3267 if (sym->ns != gfc_current_ns
3268 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3271 if (sym != st->n.sym)
3275 /* ...and then to try to make the symbol into a subroutine. */
3276 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3280 gfc_set_sym_referenced (sym);
3282 if (gfc_match_eos () != MATCH_YES)
3284 m = gfc_match_actual_arglist (1, &arglist);
3287 if (m == MATCH_ERROR)
3290 if (gfc_match_eos () != MATCH_YES)
3294 /* If any alternate return labels were found, construct a SELECT
3295 statement that will jump to the right place. */
3298 for (a = arglist; a; a = a->next)
3299 if (a->expr == NULL)
3304 gfc_symtree *select_st;
3305 gfc_symbol *select_sym;
3306 char name[GFC_MAX_SYMBOL_LEN + 1];
3308 new_st.next = c = gfc_get_code ();
3309 c->op = EXEC_SELECT;
3310 sprintf (name, "_result_%s", sym->name);
3311 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3313 select_sym = select_st->n.sym;
3314 select_sym->ts.type = BT_INTEGER;
3315 select_sym->ts.kind = gfc_default_integer_kind;
3316 gfc_set_sym_referenced (select_sym);
3317 c->expr1 = gfc_get_expr ();
3318 c->expr1->expr_type = EXPR_VARIABLE;
3319 c->expr1->symtree = select_st;
3320 c->expr1->ts = select_sym->ts;
3321 c->expr1->where = gfc_current_locus;
3324 for (a = arglist; a; a = a->next)
3326 if (a->expr != NULL)
3329 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3334 c->block = gfc_get_code ();
3336 c->op = EXEC_SELECT;
3338 new_case = gfc_get_case ();
3339 new_case->high = new_case->low = gfc_int_expr (i);
3340 c->ext.case_list = new_case;
3342 c->next = gfc_get_code ();
3343 c->next->op = EXEC_GOTO;
3344 c->next->label1 = a->label;
3348 new_st.op = EXEC_CALL;
3349 new_st.symtree = st;
3350 new_st.ext.actual = arglist;
3355 gfc_syntax_error (ST_CALL);
3358 gfc_free_actual_arglist (arglist);
3363 /* Given a name, return a pointer to the common head structure,
3364 creating it if it does not exist. If FROM_MODULE is nonzero, we
3365 mangle the name so that it doesn't interfere with commons defined
3366 in the using namespace.
3367 TODO: Add to global symbol tree. */
3370 gfc_get_common (const char *name, int from_module)
3373 static int serial = 0;
3374 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3378 /* A use associated common block is only needed to correctly layout
3379 the variables it contains. */
3380 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3381 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3385 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3388 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3391 if (st->n.common == NULL)
3393 st->n.common = gfc_get_common_head ();
3394 st->n.common->where = gfc_current_locus;
3395 strcpy (st->n.common->name, name);
3398 return st->n.common;
3402 /* Match a common block name. */
3404 match match_common_name (char *name)
3408 if (gfc_match_char ('/') == MATCH_NO)
3414 if (gfc_match_char ('/') == MATCH_YES)
3420 m = gfc_match_name (name);
3422 if (m == MATCH_ERROR)
3424 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3427 gfc_error ("Syntax error in common block name at %C");
3432 /* Match a COMMON statement. */
3435 gfc_match_common (void)
3437 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3438 char name[GFC_MAX_SYMBOL_LEN + 1];
3445 old_blank_common = gfc_current_ns->blank_common.head;
3446 if (old_blank_common)
3448 while (old_blank_common->common_next)
3449 old_blank_common = old_blank_common->common_next;
3456 m = match_common_name (name);
3457 if (m == MATCH_ERROR)
3460 gsym = gfc_get_gsymbol (name);
3461 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3463 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3464 "is not COMMON", name);
3468 if (gsym->type == GSYM_UNKNOWN)
3470 gsym->type = GSYM_COMMON;
3471 gsym->where = gfc_current_locus;
3477 if (name[0] == '\0')
3479 t = &gfc_current_ns->blank_common;
3480 if (t->head == NULL)
3481 t->where = gfc_current_locus;
3485 t = gfc_get_common (name, 0);
3494 while (tail->common_next)
3495 tail = tail->common_next;
3498 /* Grab the list of symbols. */
3501 m = gfc_match_symbol (&sym, 0);
3502 if (m == MATCH_ERROR)
3507 /* Store a ref to the common block for error checking. */
3508 sym->common_block = t;
3510 /* See if we know the current common block is bind(c), and if
3511 so, then see if we can check if the symbol is (which it'll
3512 need to be). This can happen if the bind(c) attr stmt was
3513 applied to the common block, and the variable(s) already
3514 defined, before declaring the common block. */
3515 if (t->is_bind_c == 1)
3517 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3519 /* If we find an error, just print it and continue,
3520 cause it's just semantic, and we can see if there
3522 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3523 "at %C must be declared with a C "
3524 "interoperable kind since common block "
3526 sym->name, &(sym->declared_at), t->name,
3530 if (sym->attr.is_bind_c == 1)
3531 gfc_error_now ("Variable '%s' in common block "
3532 "'%s' at %C can not be bind(c) since "
3533 "it is not global", sym->name, t->name);
3536 if (sym->attr.in_common)
3538 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3543 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3544 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3546 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3547 "can only be COMMON in "
3548 "BLOCK DATA", sym->name)
3553 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3557 tail->common_next = sym;
3563 /* Deal with an optional array specification after the
3565 m = gfc_match_array_spec (&as);
3566 if (m == MATCH_ERROR)
3571 if (as->type != AS_EXPLICIT)
3573 gfc_error ("Array specification for symbol '%s' in COMMON "
3574 "at %C must be explicit", sym->name);
3578 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3581 if (sym->attr.pointer)
3583 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3584 "POINTER array", sym->name);
3593 sym->common_head = t;
3595 /* Check to see if the symbol is already in an equivalence group.
3596 If it is, set the other members as being in common. */
3597 if (sym->attr.in_equivalence)
3599 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3601 for (e2 = e1; e2; e2 = e2->eq)
3602 if (e2->expr->symtree->n.sym == sym)
3609 for (e2 = e1; e2; e2 = e2->eq)
3611 other = e2->expr->symtree->n.sym;
3612 if (other->common_head
3613 && other->common_head != sym->common_head)
3615 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3616 "%C is being indirectly equivalenced to "
3617 "another COMMON block '%s'",
3618 sym->name, sym->common_head->name,
3619 other->common_head->name);
3622 other->attr.in_common = 1;
3623 other->common_head = t;
3629 gfc_gobble_whitespace ();
3630 if (gfc_match_eos () == MATCH_YES)
3632 if (gfc_peek_ascii_char () == '/')
3634 if (gfc_match_char (',') != MATCH_YES)
3636 gfc_gobble_whitespace ();
3637 if (gfc_peek_ascii_char () == '/')
3646 gfc_syntax_error (ST_COMMON);
3649 if (old_blank_common)
3650 old_blank_common->common_next = NULL;
3652 gfc_current_ns->blank_common.head = NULL;
3653 gfc_free_array_spec (as);
3658 /* Match a BLOCK DATA program unit. */
3661 gfc_match_block_data (void)
3663 char name[GFC_MAX_SYMBOL_LEN + 1];
3667 if (gfc_match_eos () == MATCH_YES)
3669 gfc_new_block = NULL;
3673 m = gfc_match ("% %n%t", name);
3677 if (gfc_get_symbol (name, NULL, &sym))
3680 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3683 gfc_new_block = sym;
3689 /* Free a namelist structure. */
3692 gfc_free_namelist (gfc_namelist *name)
3696 for (; name; name = n)
3704 /* Match a NAMELIST statement. */
3707 gfc_match_namelist (void)
3709 gfc_symbol *group_name, *sym;
3713 m = gfc_match (" / %s /", &group_name);
3716 if (m == MATCH_ERROR)
3721 if (group_name->ts.type != BT_UNKNOWN)
3723 gfc_error ("Namelist group name '%s' at %C already has a basic "
3724 "type of %s", group_name->name,
3725 gfc_typename (&group_name->ts));
3729 if (group_name->attr.flavor == FL_NAMELIST
3730 && group_name->attr.use_assoc
3731 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3732 "at %C already is USE associated and can"
3733 "not be respecified.", group_name->name)
3737 if (group_name->attr.flavor != FL_NAMELIST
3738 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3739 group_name->name, NULL) == FAILURE)
3744 m = gfc_match_symbol (&sym, 1);
3747 if (m == MATCH_ERROR)
3750 if (sym->attr.in_namelist == 0
3751 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
3754 /* Use gfc_error_check here, rather than goto error, so that
3755 these are the only errors for the next two lines. */
3756 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
3758 gfc_error ("Assumed size array '%s' in namelist '%s' at "
3759 "%C is not allowed", sym->name, group_name->name);
3763 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
3765 gfc_error ("Assumed character length '%s' in namelist '%s' at "
3766 "%C is not allowed", sym->name, group_name->name);
3770 nl = gfc_get_namelist ();
3774 if (group_name->namelist == NULL)
3775 group_name->namelist = group_name->namelist_tail = nl;
3778 group_name->namelist_tail->next = nl;
3779 group_name->namelist_tail = nl;
3782 if (gfc_match_eos () == MATCH_YES)
3785 m = gfc_match_char (',');
3787 if (gfc_match_char ('/') == MATCH_YES)
3789 m2 = gfc_match (" %s /", &group_name);
3790 if (m2 == MATCH_YES)
3792 if (m2 == MATCH_ERROR)
3806 gfc_syntax_error (ST_NAMELIST);
3813 /* Match a MODULE statement. */
3816 gfc_match_module (void)
3820 m = gfc_match (" %s%t", &gfc_new_block);
3824 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
3825 gfc_new_block->name, NULL) == FAILURE)
3832 /* Free equivalence sets and lists. Recursively is the easiest way to
3836 gfc_free_equiv (gfc_equiv *eq)
3841 gfc_free_equiv (eq->eq);
3842 gfc_free_equiv (eq->next);
3843 gfc_free_expr (eq->expr);
3848 /* Match an EQUIVALENCE statement. */
3851 gfc_match_equivalence (void)
3853 gfc_equiv *eq, *set, *tail;
3857 gfc_common_head *common_head = NULL;
3865 eq = gfc_get_equiv ();
3869 eq->next = gfc_current_ns->equiv;
3870 gfc_current_ns->equiv = eq;
3872 if (gfc_match_char ('(') != MATCH_YES)
3876 common_flag = FALSE;
3881 m = gfc_match_equiv_variable (&set->expr);
3882 if (m == MATCH_ERROR)
3887 /* count the number of objects. */
3890 if (gfc_match_char ('%') == MATCH_YES)
3892 gfc_error ("Derived type component %C is not a "
3893 "permitted EQUIVALENCE member");
3897 for (ref = set->expr->ref; ref; ref = ref->next)
3898 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
3900 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
3901 "be an array section");
3905 sym = set->expr->symtree->n.sym;
3907 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
3910 if (sym->attr.in_common)
3913 common_head = sym->common_head;
3916 if (gfc_match_char (')') == MATCH_YES)
3919 if (gfc_match_char (',') != MATCH_YES)
3922 set->eq = gfc_get_equiv ();
3928 gfc_error ("EQUIVALENCE at %C requires two or more objects");
3932 /* If one of the members of an equivalence is in common, then
3933 mark them all as being in common. Before doing this, check
3934 that members of the equivalence group are not in different
3937 for (set = eq; set; set = set->eq)
3939 sym = set->expr->symtree->n.sym;
3940 if (sym->common_head && sym->common_head != common_head)
3942 gfc_error ("Attempt to indirectly overlap COMMON "
3943 "blocks %s and %s by EQUIVALENCE at %C",
3944 sym->common_head->name, common_head->name);
3947 sym->attr.in_common = 1;
3948 sym->common_head = common_head;
3951 if (gfc_match_eos () == MATCH_YES)
3953 if (gfc_match_char (',') != MATCH_YES)
3955 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
3963 gfc_syntax_error (ST_EQUIVALENCE);
3969 gfc_free_equiv (gfc_current_ns->equiv);
3970 gfc_current_ns->equiv = eq;
3976 /* Check that a statement function is not recursive. This is done by looking
3977 for the statement function symbol(sym) by looking recursively through its
3978 expression(e). If a reference to sym is found, true is returned.
3979 12.5.4 requires that any variable of function that is implicitly typed
3980 shall have that type confirmed by any subsequent type declaration. The
3981 implicit typing is conveniently done here. */
3983 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
3986 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
3992 switch (e->expr_type)
3995 if (e->symtree == NULL)
3998 /* Check the name before testing for nested recursion! */
3999 if (sym->name == e->symtree->n.sym->name)
4002 /* Catch recursion via other statement functions. */
4003 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4004 && e->symtree->n.sym->value
4005 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4008 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4009 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4014 if (e->symtree && sym->name == e->symtree->n.sym->name)
4017 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4018 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4030 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4032 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4036 /* Match a statement function declaration. It is so easy to match
4037 non-statement function statements with a MATCH_ERROR as opposed to
4038 MATCH_NO that we suppress error message in most cases. */
4041 gfc_match_st_function (void)
4043 gfc_error_buf old_error;
4048 m = gfc_match_symbol (&sym, 0);
4052 gfc_push_error (&old_error);
4054 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4055 sym->name, NULL) == FAILURE)
4058 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4061 m = gfc_match (" = %e%t", &expr);
4065 gfc_free_error (&old_error);
4066 if (m == MATCH_ERROR)
4069 if (recursive_stmt_fcn (expr, sym))
4071 gfc_error ("Statement function at %L is recursive", &expr->where);
4077 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4078 "Statement function at %C") == FAILURE)
4084 gfc_pop_error (&old_error);
4089 /***************** SELECT CASE subroutines ******************/
4091 /* Free a single case structure. */
4094 free_case (gfc_case *p)
4096 if (p->low == p->high)
4098 gfc_free_expr (p->low);
4099 gfc_free_expr (p->high);
4104 /* Free a list of case structures. */
4107 gfc_free_case_list (gfc_case *p)
4119 /* Match a single case selector. */
4122 match_case_selector (gfc_case **cp)
4127 c = gfc_get_case ();
4128 c->where = gfc_current_locus;
4130 if (gfc_match_char (':') == MATCH_YES)
4132 m = gfc_match_init_expr (&c->high);
4135 if (m == MATCH_ERROR)
4140 m = gfc_match_init_expr (&c->low);
4141 if (m == MATCH_ERROR)
4146 /* If we're not looking at a ':' now, make a range out of a single
4147 target. Else get the upper bound for the case range. */
4148 if (gfc_match_char (':') != MATCH_YES)
4152 m = gfc_match_init_expr (&c->high);
4153 if (m == MATCH_ERROR)
4155 /* MATCH_NO is fine. It's OK if nothing is there! */
4163 gfc_error ("Expected initialization expression in CASE at %C");
4171 /* Match the end of a case statement. */
4174 match_case_eos (void)
4176 char name[GFC_MAX_SYMBOL_LEN + 1];
4179 if (gfc_match_eos () == MATCH_YES)
4182 /* If the case construct doesn't have a case-construct-name, we
4183 should have matched the EOS. */
4184 if (!gfc_current_block ())
4187 gfc_gobble_whitespace ();
4189 m = gfc_match_name (name);
4193 if (strcmp (name, gfc_current_block ()->name) != 0)
4195 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4196 gfc_current_block ()->name);
4200 return gfc_match_eos ();
4204 /* Match a SELECT statement. */
4207 gfc_match_select (void)
4212 m = gfc_match_label ();
4213 if (m == MATCH_ERROR)
4216 m = gfc_match (" select case ( %e )%t", &expr);
4220 new_st.op = EXEC_SELECT;
4221 new_st.expr1 = expr;
4227 /* Push the current selector onto the SELECT TYPE stack. */
4230 select_type_push (gfc_symbol *sel)
4232 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4233 top->selector = sel;
4235 top->prev = select_type_stack;
4237 select_type_stack = top;
4241 /* Set the temporary for the current SELECT TYPE selector. */
4244 select_type_set_tmp (gfc_typespec *ts)
4246 char name[GFC_MAX_SYMBOL_LEN];
4249 if (!gfc_type_is_extensible (ts->u.derived))
4252 if (ts->type == BT_CLASS)
4253 sprintf (name, "tmp$class$%s", ts->u.derived->name);
4255 sprintf (name, "tmp$type$%s", ts->u.derived->name);
4256 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4257 gfc_add_type (tmp->n.sym, ts, NULL);
4258 gfc_set_sym_referenced (tmp->n.sym);
4259 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4260 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4261 if (ts->type == BT_CLASS)
4263 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4265 tmp->n.sym->attr.class_ok = 1;
4268 select_type_stack->tmp = tmp;
4272 /* Match a SELECT TYPE statement. */
4275 gfc_match_select_type (void)
4277 gfc_expr *expr1, *expr2 = NULL;
4279 char name[GFC_MAX_SYMBOL_LEN];
4281 m = gfc_match_label ();
4282 if (m == MATCH_ERROR)
4285 m = gfc_match (" select type ( ");
4289 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4291 m = gfc_match (" %n => %e", name, &expr2);
4294 expr1 = gfc_get_expr();
4295 expr1->expr_type = EXPR_VARIABLE;
4296 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4298 expr1->symtree->n.sym->ts = expr2->ts;
4299 expr1->symtree->n.sym->attr.referenced = 1;
4300 expr1->symtree->n.sym->attr.class_ok = 1;
4304 m = gfc_match (" %e ", &expr1);
4309 m = gfc_match (" )%t");
4313 /* Check for F03:C811. */
4314 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4316 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4317 "use associate-name=>");
4321 /* Check for F03:C813. */
4322 if (expr1->ts.type != BT_CLASS && !(expr2 && expr2->ts.type == BT_CLASS))
4324 gfc_error ("Selector shall be polymorphic in SELECT TYPE statement "
4329 new_st.op = EXEC_SELECT_TYPE;
4330 new_st.expr1 = expr1;
4331 new_st.expr2 = expr2;
4332 new_st.ext.ns = gfc_current_ns;
4334 select_type_push (expr1->symtree->n.sym);
4340 /* Match a CASE statement. */
4343 gfc_match_case (void)
4345 gfc_case *c, *head, *tail;
4350 if (gfc_current_state () != COMP_SELECT)
4352 gfc_error ("Unexpected CASE statement at %C");
4356 if (gfc_match ("% default") == MATCH_YES)
4358 m = match_case_eos ();
4361 if (m == MATCH_ERROR)
4364 new_st.op = EXEC_SELECT;
4365 c = gfc_get_case ();
4366 c->where = gfc_current_locus;
4367 new_st.ext.case_list = c;
4371 if (gfc_match_char ('(') != MATCH_YES)
4376 if (match_case_selector (&c) == MATCH_ERROR)
4386 if (gfc_match_char (')') == MATCH_YES)
4388 if (gfc_match_char (',') != MATCH_YES)
4392 m = match_case_eos ();
4395 if (m == MATCH_ERROR)
4398 new_st.op = EXEC_SELECT;
4399 new_st.ext.case_list = head;
4404 gfc_error ("Syntax error in CASE specification at %C");
4407 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4412 /* Match a TYPE IS statement. */
4415 gfc_match_type_is (void)
4420 if (gfc_current_state () != COMP_SELECT_TYPE)
4422 gfc_error ("Unexpected TYPE IS statement at %C");
4426 if (gfc_match_char ('(') != MATCH_YES)
4429 c = gfc_get_case ();
4430 c->where = gfc_current_locus;
4432 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4433 match_type_spec here. */
4434 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4437 if (gfc_match_char (')') != MATCH_YES)
4440 m = match_case_eos ();
4443 if (m == MATCH_ERROR)
4446 new_st.op = EXEC_SELECT_TYPE;
4447 new_st.ext.case_list = c;
4449 /* Create temporary variable. */
4450 select_type_set_tmp (&c->ts);
4455 gfc_error ("Syntax error in TYPE IS specification at %C");
4459 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4464 /* Match a CLASS IS or CLASS DEFAULT statement. */
4467 gfc_match_class_is (void)
4472 if (gfc_current_state () != COMP_SELECT_TYPE)
4475 if (gfc_match ("% default") == MATCH_YES)
4477 m = match_case_eos ();
4480 if (m == MATCH_ERROR)
4483 new_st.op = EXEC_SELECT_TYPE;
4484 c = gfc_get_case ();
4485 c->where = gfc_current_locus;
4486 c->ts.type = BT_UNKNOWN;
4487 new_st.ext.case_list = c;
4491 m = gfc_match ("% is");
4494 if (m == MATCH_ERROR)
4497 if (gfc_match_char ('(') != MATCH_YES)
4500 c = gfc_get_case ();
4501 c->where = gfc_current_locus;
4503 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4506 if (c->ts.type == BT_DERIVED)
4507 c->ts.type = BT_CLASS;
4509 if (gfc_match_char (')') != MATCH_YES)
4512 m = match_case_eos ();
4515 if (m == MATCH_ERROR)
4518 new_st.op = EXEC_SELECT_TYPE;
4519 new_st.ext.case_list = c;
4521 /* Create temporary variable. */
4522 select_type_set_tmp (&c->ts);
4527 gfc_error ("Syntax error in CLASS IS specification at %C");
4531 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4536 /********************* WHERE subroutines ********************/
4538 /* Match the rest of a simple WHERE statement that follows an IF statement.
4542 match_simple_where (void)
4548 m = gfc_match (" ( %e )", &expr);
4552 m = gfc_match_assignment ();
4555 if (m == MATCH_ERROR)
4558 if (gfc_match_eos () != MATCH_YES)
4561 c = gfc_get_code ();
4565 c->next = gfc_get_code ();
4568 gfc_clear_new_st ();
4570 new_st.op = EXEC_WHERE;
4576 gfc_syntax_error (ST_WHERE);
4579 gfc_free_expr (expr);
4584 /* Match a WHERE statement. */
4587 gfc_match_where (gfc_statement *st)
4593 m0 = gfc_match_label ();
4594 if (m0 == MATCH_ERROR)
4597 m = gfc_match (" where ( %e )", &expr);
4601 if (gfc_match_eos () == MATCH_YES)
4603 *st = ST_WHERE_BLOCK;
4604 new_st.op = EXEC_WHERE;
4605 new_st.expr1 = expr;
4609 m = gfc_match_assignment ();
4611 gfc_syntax_error (ST_WHERE);
4615 gfc_free_expr (expr);
4619 /* We've got a simple WHERE statement. */
4621 c = gfc_get_code ();
4625 c->next = gfc_get_code ();
4628 gfc_clear_new_st ();
4630 new_st.op = EXEC_WHERE;
4637 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4638 new_st if successful. */
4641 gfc_match_elsewhere (void)
4643 char name[GFC_MAX_SYMBOL_LEN + 1];
4647 if (gfc_current_state () != COMP_WHERE)
4649 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4655 if (gfc_match_char ('(') == MATCH_YES)
4657 m = gfc_match_expr (&expr);
4660 if (m == MATCH_ERROR)
4663 if (gfc_match_char (')') != MATCH_YES)
4667 if (gfc_match_eos () != MATCH_YES)
4669 /* Only makes sense if we have a where-construct-name. */
4670 if (!gfc_current_block ())
4675 /* Better be a name at this point. */
4676 m = gfc_match_name (name);
4679 if (m == MATCH_ERROR)
4682 if (gfc_match_eos () != MATCH_YES)
4685 if (strcmp (name, gfc_current_block ()->name) != 0)
4687 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4688 name, gfc_current_block ()->name);
4693 new_st.op = EXEC_WHERE;
4694 new_st.expr1 = expr;
4698 gfc_syntax_error (ST_ELSEWHERE);
4701 gfc_free_expr (expr);
4706 /******************** FORALL subroutines ********************/
4708 /* Free a list of FORALL iterators. */
4711 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4713 gfc_forall_iterator *next;
4718 gfc_free_expr (iter->var);
4719 gfc_free_expr (iter->start);
4720 gfc_free_expr (iter->end);
4721 gfc_free_expr (iter->stride);
4728 /* Match an iterator as part of a FORALL statement. The format is:
4730 <var> = <start>:<end>[:<stride>]
4732 On MATCH_NO, the caller tests for the possibility that there is a
4733 scalar mask expression. */
4736 match_forall_iterator (gfc_forall_iterator **result)
4738 gfc_forall_iterator *iter;
4742 where = gfc_current_locus;
4743 iter = XCNEW (gfc_forall_iterator);
4745 m = gfc_match_expr (&iter->var);
4749 if (gfc_match_char ('=') != MATCH_YES
4750 || iter->var->expr_type != EXPR_VARIABLE)
4756 m = gfc_match_expr (&iter->start);
4760 if (gfc_match_char (':') != MATCH_YES)
4763 m = gfc_match_expr (&iter->end);
4766 if (m == MATCH_ERROR)
4769 if (gfc_match_char (':') == MATCH_NO)
4770 iter->stride = gfc_int_expr (1);
4773 m = gfc_match_expr (&iter->stride);
4776 if (m == MATCH_ERROR)
4780 /* Mark the iteration variable's symbol as used as a FORALL index. */
4781 iter->var->symtree->n.sym->forall_index = true;
4787 gfc_error ("Syntax error in FORALL iterator at %C");
4792 gfc_current_locus = where;
4793 gfc_free_forall_iterator (iter);
4798 /* Match the header of a FORALL statement. */
4801 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
4803 gfc_forall_iterator *head, *tail, *new_iter;
4807 gfc_gobble_whitespace ();
4812 if (gfc_match_char ('(') != MATCH_YES)
4815 m = match_forall_iterator (&new_iter);
4816 if (m == MATCH_ERROR)
4821 head = tail = new_iter;
4825 if (gfc_match_char (',') != MATCH_YES)
4828 m = match_forall_iterator (&new_iter);
4829 if (m == MATCH_ERROR)
4834 tail->next = new_iter;
4839 /* Have to have a mask expression. */
4841 m = gfc_match_expr (&msk);
4844 if (m == MATCH_ERROR)
4850 if (gfc_match_char (')') == MATCH_NO)
4858 gfc_syntax_error (ST_FORALL);
4861 gfc_free_expr (msk);
4862 gfc_free_forall_iterator (head);
4867 /* Match the rest of a simple FORALL statement that follows an
4871 match_simple_forall (void)
4873 gfc_forall_iterator *head;
4882 m = match_forall_header (&head, &mask);
4889 m = gfc_match_assignment ();
4891 if (m == MATCH_ERROR)
4895 m = gfc_match_pointer_assignment ();
4896 if (m == MATCH_ERROR)
4902 c = gfc_get_code ();
4904 c->loc = gfc_current_locus;
4906 if (gfc_match_eos () != MATCH_YES)
4909 gfc_clear_new_st ();
4910 new_st.op = EXEC_FORALL;
4911 new_st.expr1 = mask;
4912 new_st.ext.forall_iterator = head;
4913 new_st.block = gfc_get_code ();
4915 new_st.block->op = EXEC_FORALL;
4916 new_st.block->next = c;
4921 gfc_syntax_error (ST_FORALL);
4924 gfc_free_forall_iterator (head);
4925 gfc_free_expr (mask);
4931 /* Match a FORALL statement. */
4934 gfc_match_forall (gfc_statement *st)
4936 gfc_forall_iterator *head;
4945 m0 = gfc_match_label ();
4946 if (m0 == MATCH_ERROR)
4949 m = gfc_match (" forall");
4953 m = match_forall_header (&head, &mask);
4954 if (m == MATCH_ERROR)
4959 if (gfc_match_eos () == MATCH_YES)
4961 *st = ST_FORALL_BLOCK;
4962 new_st.op = EXEC_FORALL;
4963 new_st.expr1 = mask;
4964 new_st.ext.forall_iterator = head;
4968 m = gfc_match_assignment ();
4969 if (m == MATCH_ERROR)
4973 m = gfc_match_pointer_assignment ();
4974 if (m == MATCH_ERROR)
4980 c = gfc_get_code ();
4982 c->loc = gfc_current_locus;
4984 gfc_clear_new_st ();
4985 new_st.op = EXEC_FORALL;
4986 new_st.expr1 = mask;
4987 new_st.ext.forall_iterator = head;
4988 new_st.block = gfc_get_code ();
4989 new_st.block->op = EXEC_FORALL;
4990 new_st.block->next = c;
4996 gfc_syntax_error (ST_FORALL);
4999 gfc_free_forall_iterator (head);
5000 gfc_free_expr (mask);
5001 gfc_free_statements (c);