1 /* Matching subroutines in all sizes, shapes and colors.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 2010 Free Software Foundation, Inc.
5 Contributed by Andy Vaught
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
30 int gfc_matching_ptr_assignment = 0;
31 int gfc_matching_procptr_assignment = 0;
32 bool gfc_matching_prefix = false;
34 /* Stack of SELECT TYPE statements. */
35 gfc_select_type_stack *select_type_stack = NULL;
37 /* For debugging and diagnostic purposes. Return the textual representation
38 of the intrinsic operator OP. */
40 gfc_op2string (gfc_intrinsic_op op)
48 case INTRINSIC_UMINUS:
54 case INTRINSIC_CONCAT:
58 case INTRINSIC_DIVIDE:
97 case INTRINSIC_ASSIGN:
100 case INTRINSIC_PARENTHESES:
107 gfc_internal_error ("gfc_op2string(): Bad code");
112 /******************** Generic matching subroutines ************************/
114 /* This function scans the current statement counting the opened and closed
115 parenthesis to make sure they are balanced. */
118 gfc_match_parens (void)
120 locus old_loc, where;
122 gfc_instring instring;
125 old_loc = gfc_current_locus;
127 instring = NONSTRING;
132 c = gfc_next_char_literal (instring);
135 if (quote == ' ' && ((c == '\'') || (c == '"')))
138 instring = INSTRING_WARN;
141 if (quote != ' ' && c == quote)
144 instring = NONSTRING;
148 if (c == '(' && quote == ' ')
151 where = gfc_current_locus;
153 if (c == ')' && quote == ' ')
156 where = gfc_current_locus;
160 gfc_current_locus = old_loc;
164 gfc_error ("Missing ')' in statement at or before %L", &where);
169 gfc_error ("Missing '(' in statement at or before %L", &where);
177 /* See if the next character is a special character that has
178 escaped by a \ via the -fbackslash option. */
181 gfc_match_special_char (gfc_char_t *res)
189 switch ((c = gfc_next_char_literal (INSTRING_WARN)))
222 /* Hexadecimal form of wide characters. */
223 len = (c == 'x' ? 2 : (c == 'u' ? 4 : 8));
225 for (i = 0; i < len; i++)
227 char buf[2] = { '\0', '\0' };
229 c = gfc_next_char_literal (INSTRING_WARN);
230 if (!gfc_wide_fits_in_byte (c)
231 || !gfc_check_digit ((unsigned char) c, 16))
234 buf[0] = (unsigned char) c;
236 n += strtol (buf, NULL, 16);
242 /* Unknown backslash codes are simply not expanded. */
251 /* In free form, match at least one space. Always matches in fixed
255 gfc_match_space (void)
260 if (gfc_current_form == FORM_FIXED)
263 old_loc = gfc_current_locus;
265 c = gfc_next_ascii_char ();
266 if (!gfc_is_whitespace (c))
268 gfc_current_locus = old_loc;
272 gfc_gobble_whitespace ();
278 /* Match an end of statement. End of statement is optional
279 whitespace, followed by a ';' or '\n' or comment '!'. If a
280 semicolon is found, we continue to eat whitespace and semicolons. */
293 old_loc = gfc_current_locus;
294 gfc_gobble_whitespace ();
296 c = gfc_next_ascii_char ();
302 c = gfc_next_ascii_char ();
319 gfc_current_locus = old_loc;
320 return (flag) ? MATCH_YES : MATCH_NO;
324 /* Match a literal integer on the input, setting the value on
325 MATCH_YES. Literal ints occur in kind-parameters as well as
326 old-style character length specifications. If cnt is non-NULL it
327 will be set to the number of digits. */
330 gfc_match_small_literal_int (int *value, int *cnt)
336 old_loc = gfc_current_locus;
339 gfc_gobble_whitespace ();
340 c = gfc_next_ascii_char ();
346 gfc_current_locus = old_loc;
355 old_loc = gfc_current_locus;
356 c = gfc_next_ascii_char ();
361 i = 10 * i + c - '0';
366 gfc_error ("Integer too large at %C");
371 gfc_current_locus = old_loc;
380 /* Match a small, constant integer expression, like in a kind
381 statement. On MATCH_YES, 'value' is set. */
384 gfc_match_small_int (int *value)
391 m = gfc_match_expr (&expr);
395 p = gfc_extract_int (expr, &i);
396 gfc_free_expr (expr);
409 /* This function is the same as the gfc_match_small_int, except that
410 we're keeping the pointer to the expr. This function could just be
411 removed and the previously mentioned one modified, though all calls
412 to it would have to be modified then (and there were a number of
413 them). Return MATCH_ERROR if fail to extract the int; otherwise,
414 return the result of gfc_match_expr(). The expr (if any) that was
415 matched is returned in the parameter expr. */
418 gfc_match_small_int_expr (int *value, gfc_expr **expr)
424 m = gfc_match_expr (expr);
428 p = gfc_extract_int (*expr, &i);
441 /* Matches a statement label. Uses gfc_match_small_literal_int() to
442 do most of the work. */
445 gfc_match_st_label (gfc_st_label **label)
451 old_loc = gfc_current_locus;
453 m = gfc_match_small_literal_int (&i, &cnt);
459 gfc_error ("Too many digits in statement label at %C");
465 gfc_error ("Statement label at %C is zero");
469 *label = gfc_get_st_label (i);
474 gfc_current_locus = old_loc;
479 /* Match and validate a label associated with a named IF, DO or SELECT
480 statement. If the symbol does not have the label attribute, we add
481 it. We also make sure the symbol does not refer to another
482 (active) block. A matched label is pointed to by gfc_new_block. */
485 gfc_match_label (void)
487 char name[GFC_MAX_SYMBOL_LEN + 1];
490 gfc_new_block = NULL;
492 m = gfc_match (" %n :", name);
496 if (gfc_get_symbol (name, NULL, &gfc_new_block))
498 gfc_error ("Label name '%s' at %C is ambiguous", name);
502 if (gfc_new_block->attr.flavor == FL_LABEL)
504 gfc_error ("Duplicate construct label '%s' at %C", name);
508 if (gfc_add_flavor (&gfc_new_block->attr, FL_LABEL,
509 gfc_new_block->name, NULL) == FAILURE)
516 /* See if the current input looks like a name of some sort. Modifies
517 the passed buffer which must be GFC_MAX_SYMBOL_LEN+1 bytes long.
518 Note that options.c restricts max_identifier_length to not more
519 than GFC_MAX_SYMBOL_LEN. */
522 gfc_match_name (char *buffer)
528 old_loc = gfc_current_locus;
529 gfc_gobble_whitespace ();
531 c = gfc_next_ascii_char ();
532 if (!(ISALPHA (c) || (c == '_' && gfc_option.flag_allow_leading_underscore)))
534 if (gfc_error_flag_test() == 0 && c != '(')
535 gfc_error ("Invalid character in name at %C");
536 gfc_current_locus = old_loc;
546 if (i > gfc_option.max_identifier_length)
548 gfc_error ("Name at %C is too long");
552 old_loc = gfc_current_locus;
553 c = gfc_next_ascii_char ();
555 while (ISALNUM (c) || c == '_' || (gfc_option.flag_dollar_ok && c == '$'));
557 if (c == '$' && !gfc_option.flag_dollar_ok)
559 gfc_error ("Invalid character '$' at %C. Use -fdollar-ok to allow it "
565 gfc_current_locus = old_loc;
571 /* Match a valid name for C, which is almost the same as for Fortran,
572 except that you can start with an underscore, etc.. It could have
573 been done by modifying the gfc_match_name, but this way other
574 things C allows can be added, such as no limits on the length.
575 Right now, the length is limited to the same thing as Fortran..
576 Also, by rewriting it, we use the gfc_next_char_C() to prevent the
577 input characters from being automatically lower cased, since C is
578 case sensitive. The parameter, buffer, is used to return the name
579 that is matched. Return MATCH_ERROR if the name is too long
580 (though this is a self-imposed limit), MATCH_NO if what we're
581 seeing isn't a name, and MATCH_YES if we successfully match a C
585 gfc_match_name_C (char *buffer)
591 old_loc = gfc_current_locus;
592 gfc_gobble_whitespace ();
594 /* Get the next char (first possible char of name) and see if
595 it's valid for C (either a letter or an underscore). */
596 c = gfc_next_char_literal (INSTRING_WARN);
598 /* If the user put nothing expect spaces between the quotes, it is valid
599 and simply means there is no name= specifier and the name is the fortran
600 symbol name, all lowercase. */
601 if (c == '"' || c == '\'')
604 gfc_current_locus = old_loc;
608 if (!ISALPHA (c) && c != '_')
610 gfc_error ("Invalid C name in NAME= specifier at %C");
614 /* Continue to read valid variable name characters. */
617 gcc_assert (gfc_wide_fits_in_byte (c));
619 buffer[i++] = (unsigned char) c;
621 /* C does not define a maximum length of variable names, to my
622 knowledge, but the compiler typically places a limit on them.
623 For now, i'll use the same as the fortran limit for simplicity,
624 but this may need to be changed to a dynamic buffer that can
625 be realloc'ed here if necessary, or more likely, a larger
627 if (i > gfc_option.max_identifier_length)
629 gfc_error ("Name at %C is too long");
633 old_loc = gfc_current_locus;
635 /* Get next char; param means we're in a string. */
636 c = gfc_next_char_literal (INSTRING_WARN);
637 } while (ISALNUM (c) || c == '_');
640 gfc_current_locus = old_loc;
642 /* See if we stopped because of whitespace. */
645 gfc_gobble_whitespace ();
646 c = gfc_peek_ascii_char ();
647 if (c != '"' && c != '\'')
649 gfc_error ("Embedded space in NAME= specifier at %C");
654 /* If we stopped because we had an invalid character for a C name, report
655 that to the user by returning MATCH_NO. */
656 if (c != '"' && c != '\'')
658 gfc_error ("Invalid C name in NAME= specifier at %C");
666 /* Match a symbol on the input. Modifies the pointer to the symbol
667 pointer if successful. */
670 gfc_match_sym_tree (gfc_symtree **matched_symbol, int host_assoc)
672 char buffer[GFC_MAX_SYMBOL_LEN + 1];
675 m = gfc_match_name (buffer);
680 return (gfc_get_ha_sym_tree (buffer, matched_symbol))
681 ? MATCH_ERROR : MATCH_YES;
683 if (gfc_get_sym_tree (buffer, NULL, matched_symbol, false))
691 gfc_match_symbol (gfc_symbol **matched_symbol, int host_assoc)
696 m = gfc_match_sym_tree (&st, host_assoc);
701 *matched_symbol = st->n.sym;
703 *matched_symbol = NULL;
706 *matched_symbol = NULL;
711 /* Match an intrinsic operator. Returns an INTRINSIC enum. While matching,
712 we always find INTRINSIC_PLUS before INTRINSIC_UPLUS. We work around this
716 gfc_match_intrinsic_op (gfc_intrinsic_op *result)
718 locus orig_loc = gfc_current_locus;
721 gfc_gobble_whitespace ();
722 ch = gfc_next_ascii_char ();
727 *result = INTRINSIC_PLUS;
732 *result = INTRINSIC_MINUS;
736 if (gfc_next_ascii_char () == '=')
739 *result = INTRINSIC_EQ;
745 if (gfc_peek_ascii_char () == '=')
748 gfc_next_ascii_char ();
749 *result = INTRINSIC_LE;
753 *result = INTRINSIC_LT;
757 if (gfc_peek_ascii_char () == '=')
760 gfc_next_ascii_char ();
761 *result = INTRINSIC_GE;
765 *result = INTRINSIC_GT;
769 if (gfc_peek_ascii_char () == '*')
772 gfc_next_ascii_char ();
773 *result = INTRINSIC_POWER;
777 *result = INTRINSIC_TIMES;
781 ch = gfc_peek_ascii_char ();
785 gfc_next_ascii_char ();
786 *result = INTRINSIC_NE;
792 gfc_next_ascii_char ();
793 *result = INTRINSIC_CONCAT;
797 *result = INTRINSIC_DIVIDE;
801 ch = gfc_next_ascii_char ();
805 if (gfc_next_ascii_char () == 'n'
806 && gfc_next_ascii_char () == 'd'
807 && gfc_next_ascii_char () == '.')
809 /* Matched ".and.". */
810 *result = INTRINSIC_AND;
816 if (gfc_next_ascii_char () == 'q')
818 ch = gfc_next_ascii_char ();
821 /* Matched ".eq.". */
822 *result = INTRINSIC_EQ_OS;
827 if (gfc_next_ascii_char () == '.')
829 /* Matched ".eqv.". */
830 *result = INTRINSIC_EQV;
838 ch = gfc_next_ascii_char ();
841 if (gfc_next_ascii_char () == '.')
843 /* Matched ".ge.". */
844 *result = INTRINSIC_GE_OS;
850 if (gfc_next_ascii_char () == '.')
852 /* Matched ".gt.". */
853 *result = INTRINSIC_GT_OS;
860 ch = gfc_next_ascii_char ();
863 if (gfc_next_ascii_char () == '.')
865 /* Matched ".le.". */
866 *result = INTRINSIC_LE_OS;
872 if (gfc_next_ascii_char () == '.')
874 /* Matched ".lt.". */
875 *result = INTRINSIC_LT_OS;
882 ch = gfc_next_ascii_char ();
885 ch = gfc_next_ascii_char ();
888 /* Matched ".ne.". */
889 *result = INTRINSIC_NE_OS;
894 if (gfc_next_ascii_char () == 'v'
895 && gfc_next_ascii_char () == '.')
897 /* Matched ".neqv.". */
898 *result = INTRINSIC_NEQV;
905 if (gfc_next_ascii_char () == 't'
906 && gfc_next_ascii_char () == '.')
908 /* Matched ".not.". */
909 *result = INTRINSIC_NOT;
916 if (gfc_next_ascii_char () == 'r'
917 && gfc_next_ascii_char () == '.')
919 /* Matched ".or.". */
920 *result = INTRINSIC_OR;
934 gfc_current_locus = orig_loc;
939 /* Match a loop control phrase:
941 <LVALUE> = <EXPR>, <EXPR> [, <EXPR> ]
943 If the final integer expression is not present, a constant unity
944 expression is returned. We don't return MATCH_ERROR until after
945 the equals sign is seen. */
948 gfc_match_iterator (gfc_iterator *iter, int init_flag)
950 char name[GFC_MAX_SYMBOL_LEN + 1];
951 gfc_expr *var, *e1, *e2, *e3;
957 /* Match the start of an iterator without affecting the symbol table. */
959 start = gfc_current_locus;
960 m = gfc_match (" %n =", name);
961 gfc_current_locus = start;
966 m = gfc_match_variable (&var, 0);
970 /* F2008, C617 & C565. */
971 if (var->symtree->n.sym->attr.codimension)
973 gfc_error ("Loop variable at %C cannot be a coarray");
977 if (var->ref != NULL)
979 gfc_error ("Loop variable at %C cannot be a sub-component");
983 gfc_match_char ('=');
985 var->symtree->n.sym->attr.implied_index = 1;
987 m = init_flag ? gfc_match_init_expr (&e1) : gfc_match_expr (&e1);
990 if (m == MATCH_ERROR)
993 if (gfc_match_char (',') != MATCH_YES)
996 m = init_flag ? gfc_match_init_expr (&e2) : gfc_match_expr (&e2);
999 if (m == MATCH_ERROR)
1002 if (gfc_match_char (',') != MATCH_YES)
1004 e3 = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
1008 m = init_flag ? gfc_match_init_expr (&e3) : gfc_match_expr (&e3);
1009 if (m == MATCH_ERROR)
1013 gfc_error ("Expected a step value in iterator at %C");
1025 gfc_error ("Syntax error in iterator at %C");
1036 /* Tries to match the next non-whitespace character on the input.
1037 This subroutine does not return MATCH_ERROR. */
1040 gfc_match_char (char c)
1044 where = gfc_current_locus;
1045 gfc_gobble_whitespace ();
1047 if (gfc_next_ascii_char () == c)
1050 gfc_current_locus = where;
1055 /* General purpose matching subroutine. The target string is a
1056 scanf-like format string in which spaces correspond to arbitrary
1057 whitespace (including no whitespace), characters correspond to
1058 themselves. The %-codes are:
1060 %% Literal percent sign
1061 %e Expression, pointer to a pointer is set
1062 %s Symbol, pointer to the symbol is set
1063 %n Name, character buffer is set to name
1064 %t Matches end of statement.
1065 %o Matches an intrinsic operator, returned as an INTRINSIC enum.
1066 %l Matches a statement label
1067 %v Matches a variable expression (an lvalue)
1068 % Matches a required space (in free form) and optional spaces. */
1071 gfc_match (const char *target, ...)
1073 gfc_st_label **label;
1082 old_loc = gfc_current_locus;
1083 va_start (argp, target);
1093 gfc_gobble_whitespace ();
1104 vp = va_arg (argp, void **);
1105 n = gfc_match_expr ((gfc_expr **) vp);
1116 vp = va_arg (argp, void **);
1117 n = gfc_match_variable ((gfc_expr **) vp, 0);
1128 vp = va_arg (argp, void **);
1129 n = gfc_match_symbol ((gfc_symbol **) vp, 0);
1140 np = va_arg (argp, char *);
1141 n = gfc_match_name (np);
1152 label = va_arg (argp, gfc_st_label **);
1153 n = gfc_match_st_label (label);
1164 ip = va_arg (argp, int *);
1165 n = gfc_match_intrinsic_op ((gfc_intrinsic_op *) ip);
1176 if (gfc_match_eos () != MATCH_YES)
1184 if (gfc_match_space () == MATCH_YES)
1190 break; /* Fall through to character matcher. */
1193 gfc_internal_error ("gfc_match(): Bad match code %c", c);
1198 /* gfc_next_ascii_char converts characters to lower-case, so we shouldn't
1199 expect an upper case character here! */
1200 gcc_assert (TOLOWER (c) == c);
1202 if (c == gfc_next_ascii_char ())
1212 /* Clean up after a failed match. */
1213 gfc_current_locus = old_loc;
1214 va_start (argp, target);
1217 for (; matches > 0; matches--)
1219 while (*p++ != '%');
1227 /* Matches that don't have to be undone */
1232 (void) va_arg (argp, void **);
1237 vp = va_arg (argp, void **);
1238 gfc_free_expr ((struct gfc_expr *)*vp);
1251 /*********************** Statement level matching **********************/
1253 /* Matches the start of a program unit, which is the program keyword
1254 followed by an obligatory symbol. */
1257 gfc_match_program (void)
1262 m = gfc_match ("% %s%t", &sym);
1266 gfc_error ("Invalid form of PROGRAM statement at %C");
1270 if (m == MATCH_ERROR)
1273 if (gfc_add_flavor (&sym->attr, FL_PROGRAM, sym->name, NULL) == FAILURE)
1276 gfc_new_block = sym;
1282 /* Match a simple assignment statement. */
1285 gfc_match_assignment (void)
1287 gfc_expr *lvalue, *rvalue;
1291 old_loc = gfc_current_locus;
1294 m = gfc_match (" %v =", &lvalue);
1297 gfc_current_locus = old_loc;
1298 gfc_free_expr (lvalue);
1303 m = gfc_match (" %e%t", &rvalue);
1306 gfc_current_locus = old_loc;
1307 gfc_free_expr (lvalue);
1308 gfc_free_expr (rvalue);
1312 gfc_set_sym_referenced (lvalue->symtree->n.sym);
1314 new_st.op = EXEC_ASSIGN;
1315 new_st.expr1 = lvalue;
1316 new_st.expr2 = rvalue;
1318 gfc_check_do_variable (lvalue->symtree);
1324 /* Match a pointer assignment statement. */
1327 gfc_match_pointer_assignment (void)
1329 gfc_expr *lvalue, *rvalue;
1333 old_loc = gfc_current_locus;
1335 lvalue = rvalue = NULL;
1336 gfc_matching_ptr_assignment = 0;
1337 gfc_matching_procptr_assignment = 0;
1339 m = gfc_match (" %v =>", &lvalue);
1346 if (lvalue->symtree->n.sym->attr.proc_pointer
1347 || gfc_is_proc_ptr_comp (lvalue, NULL))
1348 gfc_matching_procptr_assignment = 1;
1350 gfc_matching_ptr_assignment = 1;
1352 m = gfc_match (" %e%t", &rvalue);
1353 gfc_matching_ptr_assignment = 0;
1354 gfc_matching_procptr_assignment = 0;
1358 new_st.op = EXEC_POINTER_ASSIGN;
1359 new_st.expr1 = lvalue;
1360 new_st.expr2 = rvalue;
1365 gfc_current_locus = old_loc;
1366 gfc_free_expr (lvalue);
1367 gfc_free_expr (rvalue);
1372 /* We try to match an easy arithmetic IF statement. This only happens
1373 when just after having encountered a simple IF statement. This code
1374 is really duplicate with parts of the gfc_match_if code, but this is
1378 match_arithmetic_if (void)
1380 gfc_st_label *l1, *l2, *l3;
1384 m = gfc_match (" ( %e ) %l , %l , %l%t", &expr, &l1, &l2, &l3);
1388 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1389 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1390 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1392 gfc_free_expr (expr);
1396 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1397 "statement at %C") == FAILURE)
1400 new_st.op = EXEC_ARITHMETIC_IF;
1401 new_st.expr1 = expr;
1410 /* The IF statement is a bit of a pain. First of all, there are three
1411 forms of it, the simple IF, the IF that starts a block and the
1414 There is a problem with the simple IF and that is the fact that we
1415 only have a single level of undo information on symbols. What this
1416 means is for a simple IF, we must re-match the whole IF statement
1417 multiple times in order to guarantee that the symbol table ends up
1418 in the proper state. */
1420 static match match_simple_forall (void);
1421 static match match_simple_where (void);
1424 gfc_match_if (gfc_statement *if_type)
1427 gfc_st_label *l1, *l2, *l3;
1428 locus old_loc, old_loc2;
1432 n = gfc_match_label ();
1433 if (n == MATCH_ERROR)
1436 old_loc = gfc_current_locus;
1438 m = gfc_match (" if ( %e", &expr);
1442 old_loc2 = gfc_current_locus;
1443 gfc_current_locus = old_loc;
1445 if (gfc_match_parens () == MATCH_ERROR)
1448 gfc_current_locus = old_loc2;
1450 if (gfc_match_char (')') != MATCH_YES)
1452 gfc_error ("Syntax error in IF-expression at %C");
1453 gfc_free_expr (expr);
1457 m = gfc_match (" %l , %l , %l%t", &l1, &l2, &l3);
1463 gfc_error ("Block label not appropriate for arithmetic IF "
1465 gfc_free_expr (expr);
1469 if (gfc_reference_st_label (l1, ST_LABEL_TARGET) == FAILURE
1470 || gfc_reference_st_label (l2, ST_LABEL_TARGET) == FAILURE
1471 || gfc_reference_st_label (l3, ST_LABEL_TARGET) == FAILURE)
1473 gfc_free_expr (expr);
1477 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Arithmetic IF "
1478 "statement at %C") == FAILURE)
1481 new_st.op = EXEC_ARITHMETIC_IF;
1482 new_st.expr1 = expr;
1487 *if_type = ST_ARITHMETIC_IF;
1491 if (gfc_match (" then%t") == MATCH_YES)
1493 new_st.op = EXEC_IF;
1494 new_st.expr1 = expr;
1495 *if_type = ST_IF_BLOCK;
1501 gfc_error ("Block label is not appropriate for IF statement at %C");
1502 gfc_free_expr (expr);
1506 /* At this point the only thing left is a simple IF statement. At
1507 this point, n has to be MATCH_NO, so we don't have to worry about
1508 re-matching a block label. From what we've got so far, try
1509 matching an assignment. */
1511 *if_type = ST_SIMPLE_IF;
1513 m = gfc_match_assignment ();
1517 gfc_free_expr (expr);
1518 gfc_undo_symbols ();
1519 gfc_current_locus = old_loc;
1521 /* m can be MATCH_NO or MATCH_ERROR, here. For MATCH_ERROR, a mangled
1522 assignment was found. For MATCH_NO, continue to call the various
1524 if (m == MATCH_ERROR)
1527 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1529 m = gfc_match_pointer_assignment ();
1533 gfc_free_expr (expr);
1534 gfc_undo_symbols ();
1535 gfc_current_locus = old_loc;
1537 gfc_match (" if ( %e ) ", &expr); /* Guaranteed to match. */
1539 /* Look at the next keyword to see which matcher to call. Matching
1540 the keyword doesn't affect the symbol table, so we don't have to
1541 restore between tries. */
1543 #define match(string, subr, statement) \
1544 if (gfc_match(string) == MATCH_YES) { m = subr(); goto got_match; }
1548 match ("allocate", gfc_match_allocate, ST_ALLOCATE)
1549 match ("assign", gfc_match_assign, ST_LABEL_ASSIGNMENT)
1550 match ("backspace", gfc_match_backspace, ST_BACKSPACE)
1551 match ("call", gfc_match_call, ST_CALL)
1552 match ("close", gfc_match_close, ST_CLOSE)
1553 match ("continue", gfc_match_continue, ST_CONTINUE)
1554 match ("cycle", gfc_match_cycle, ST_CYCLE)
1555 match ("deallocate", gfc_match_deallocate, ST_DEALLOCATE)
1556 match ("end file", gfc_match_endfile, ST_END_FILE)
1557 match ("error stop", gfc_match_error_stop, ST_ERROR_STOP)
1558 match ("exit", gfc_match_exit, ST_EXIT)
1559 match ("flush", gfc_match_flush, ST_FLUSH)
1560 match ("forall", match_simple_forall, ST_FORALL)
1561 match ("go to", gfc_match_goto, ST_GOTO)
1562 match ("if", match_arithmetic_if, ST_ARITHMETIC_IF)
1563 match ("inquire", gfc_match_inquire, ST_INQUIRE)
1564 match ("nullify", gfc_match_nullify, ST_NULLIFY)
1565 match ("open", gfc_match_open, ST_OPEN)
1566 match ("pause", gfc_match_pause, ST_NONE)
1567 match ("print", gfc_match_print, ST_WRITE)
1568 match ("read", gfc_match_read, ST_READ)
1569 match ("return", gfc_match_return, ST_RETURN)
1570 match ("rewind", gfc_match_rewind, ST_REWIND)
1571 match ("stop", gfc_match_stop, ST_STOP)
1572 match ("wait", gfc_match_wait, ST_WAIT)
1573 match ("sync all", gfc_match_sync_all, ST_SYNC_CALL);
1574 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
1575 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
1576 match ("where", match_simple_where, ST_WHERE)
1577 match ("write", gfc_match_write, ST_WRITE)
1579 /* The gfc_match_assignment() above may have returned a MATCH_NO
1580 where the assignment was to a named constant. Check that
1581 special case here. */
1582 m = gfc_match_assignment ();
1585 gfc_error ("Cannot assign to a named constant at %C");
1586 gfc_free_expr (expr);
1587 gfc_undo_symbols ();
1588 gfc_current_locus = old_loc;
1592 /* All else has failed, so give up. See if any of the matchers has
1593 stored an error message of some sort. */
1594 if (gfc_error_check () == 0)
1595 gfc_error ("Unclassifiable statement in IF-clause at %C");
1597 gfc_free_expr (expr);
1602 gfc_error ("Syntax error in IF-clause at %C");
1605 gfc_free_expr (expr);
1609 /* At this point, we've matched the single IF and the action clause
1610 is in new_st. Rearrange things so that the IF statement appears
1613 p = gfc_get_code ();
1614 p->next = gfc_get_code ();
1616 p->next->loc = gfc_current_locus;
1621 gfc_clear_new_st ();
1623 new_st.op = EXEC_IF;
1632 /* Match an ELSE statement. */
1635 gfc_match_else (void)
1637 char name[GFC_MAX_SYMBOL_LEN + 1];
1639 if (gfc_match_eos () == MATCH_YES)
1642 if (gfc_match_name (name) != MATCH_YES
1643 || gfc_current_block () == NULL
1644 || gfc_match_eos () != MATCH_YES)
1646 gfc_error ("Unexpected junk after ELSE statement at %C");
1650 if (strcmp (name, gfc_current_block ()->name) != 0)
1652 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1653 name, gfc_current_block ()->name);
1661 /* Match an ELSE IF statement. */
1664 gfc_match_elseif (void)
1666 char name[GFC_MAX_SYMBOL_LEN + 1];
1670 m = gfc_match (" ( %e ) then", &expr);
1674 if (gfc_match_eos () == MATCH_YES)
1677 if (gfc_match_name (name) != MATCH_YES
1678 || gfc_current_block () == NULL
1679 || gfc_match_eos () != MATCH_YES)
1681 gfc_error ("Unexpected junk after ELSE IF statement at %C");
1685 if (strcmp (name, gfc_current_block ()->name) != 0)
1687 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1688 name, gfc_current_block ()->name);
1693 new_st.op = EXEC_IF;
1694 new_st.expr1 = expr;
1698 gfc_free_expr (expr);
1703 /* Free a gfc_iterator structure. */
1706 gfc_free_iterator (gfc_iterator *iter, int flag)
1712 gfc_free_expr (iter->var);
1713 gfc_free_expr (iter->start);
1714 gfc_free_expr (iter->end);
1715 gfc_free_expr (iter->step);
1722 /* Match a CRITICAL statement. */
1724 gfc_match_critical (void)
1726 gfc_st_label *label = NULL;
1728 if (gfc_match_label () == MATCH_ERROR)
1731 if (gfc_match (" critical") != MATCH_YES)
1734 if (gfc_match_st_label (&label) == MATCH_ERROR)
1737 if (gfc_match_eos () != MATCH_YES)
1739 gfc_syntax_error (ST_CRITICAL);
1743 if (gfc_pure (NULL))
1745 gfc_error ("Image control statement CRITICAL at %C in PURE procedure");
1749 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CRITICAL statement at %C")
1753 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
1755 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
1759 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
1761 gfc_error ("Nested CRITICAL block at %C");
1765 new_st.op = EXEC_CRITICAL;
1768 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1775 /* Match a BLOCK statement. */
1778 gfc_match_block (void)
1782 if (gfc_match_label () == MATCH_ERROR)
1785 if (gfc_match (" block") != MATCH_YES)
1788 /* For this to be a correct BLOCK statement, the line must end now. */
1789 m = gfc_match_eos ();
1790 if (m == MATCH_ERROR)
1799 /* Match an ASSOCIATE statement. */
1802 gfc_match_associate (void)
1804 if (gfc_match_label () == MATCH_ERROR)
1807 if (gfc_match (" associate") != MATCH_YES)
1810 /* Match the association list. */
1811 if (gfc_match_char ('(') != MATCH_YES)
1813 gfc_error ("Expected association list at %C");
1816 new_st.ext.block.assoc = NULL;
1819 gfc_association_list* newAssoc = gfc_get_association_list ();
1820 gfc_association_list* a;
1822 /* Match the next association. */
1823 if (gfc_match (" %n => %e", newAssoc->name, &newAssoc->target)
1826 gfc_error ("Expected association at %C");
1827 goto assocListError;
1829 newAssoc->where = gfc_current_locus;
1831 /* Check that the current name is not yet in the list. */
1832 for (a = new_st.ext.block.assoc; a; a = a->next)
1833 if (!strcmp (a->name, newAssoc->name))
1835 gfc_error ("Duplicate name '%s' in association at %C",
1837 goto assocListError;
1840 /* The target expression must not be coindexed. */
1841 if (gfc_is_coindexed (newAssoc->target))
1843 gfc_error ("Association target at %C must not be coindexed");
1844 goto assocListError;
1847 /* The `variable' field is left blank for now; because the target is not
1848 yet resolved, we can't use gfc_has_vector_subscript to determine it
1849 for now. This is set during resolution. */
1851 /* Put it into the list. */
1852 newAssoc->next = new_st.ext.block.assoc;
1853 new_st.ext.block.assoc = newAssoc;
1855 /* Try next one or end if closing parenthesis is found. */
1856 gfc_gobble_whitespace ();
1857 if (gfc_peek_char () == ')')
1859 if (gfc_match_char (',') != MATCH_YES)
1861 gfc_error ("Expected ')' or ',' at %C");
1868 gfc_free (newAssoc);
1871 if (gfc_match_char (')') != MATCH_YES)
1873 /* This should never happen as we peek above. */
1877 if (gfc_match_eos () != MATCH_YES)
1879 gfc_error ("Junk after ASSOCIATE statement at %C");
1886 gfc_free_association_list (new_st.ext.block.assoc);
1891 /* Match a DO statement. */
1896 gfc_iterator iter, *ip;
1898 gfc_st_label *label;
1901 old_loc = gfc_current_locus;
1904 iter.var = iter.start = iter.end = iter.step = NULL;
1906 m = gfc_match_label ();
1907 if (m == MATCH_ERROR)
1910 if (gfc_match (" do") != MATCH_YES)
1913 m = gfc_match_st_label (&label);
1914 if (m == MATCH_ERROR)
1917 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1919 if (gfc_match_eos () == MATCH_YES)
1921 iter.end = gfc_get_logical_expr (gfc_default_logical_kind, NULL, true);
1922 new_st.op = EXEC_DO_WHILE;
1926 /* Match an optional comma, if no comma is found, a space is obligatory. */
1927 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1930 /* Check for balanced parens. */
1932 if (gfc_match_parens () == MATCH_ERROR)
1935 /* See if we have a DO WHILE. */
1936 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1938 new_st.op = EXEC_DO_WHILE;
1942 /* The abortive DO WHILE may have done something to the symbol
1943 table, so we start over. */
1944 gfc_undo_symbols ();
1945 gfc_current_locus = old_loc;
1947 gfc_match_label (); /* This won't error. */
1948 gfc_match (" do "); /* This will work. */
1950 gfc_match_st_label (&label); /* Can't error out. */
1951 gfc_match_char (','); /* Optional comma. */
1953 m = gfc_match_iterator (&iter, 0);
1956 if (m == MATCH_ERROR)
1959 iter.var->symtree->n.sym->attr.implied_index = 0;
1960 gfc_check_do_variable (iter.var->symtree);
1962 if (gfc_match_eos () != MATCH_YES)
1964 gfc_syntax_error (ST_DO);
1968 new_st.op = EXEC_DO;
1972 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1975 new_st.label1 = label;
1977 if (new_st.op == EXEC_DO_WHILE)
1978 new_st.expr1 = iter.end;
1981 new_st.ext.iterator = ip = gfc_get_iterator ();
1988 gfc_free_iterator (&iter, 0);
1994 /* Match an EXIT or CYCLE statement. */
1997 match_exit_cycle (gfc_statement st, gfc_exec_op op)
1999 gfc_state_data *p, *o;
2004 if (gfc_match_eos () == MATCH_YES)
2008 char name[GFC_MAX_SYMBOL_LEN + 1];
2011 m = gfc_match ("% %n%t", name);
2012 if (m == MATCH_ERROR)
2016 gfc_syntax_error (st);
2020 /* Find the corresponding symbol. If there's a BLOCK statement
2021 between here and the label, it is not in gfc_current_ns but a parent
2023 stree = gfc_find_symtree_in_proc (name, gfc_current_ns);
2026 gfc_error ("Name '%s' in %s statement at %C is unknown",
2027 name, gfc_ascii_statement (st));
2032 if (sym->attr.flavor != FL_LABEL)
2034 gfc_error ("Name '%s' in %s statement at %C is not a construct name",
2035 name, gfc_ascii_statement (st));
2040 /* Find the loop specified by the label (or lack of a label). */
2041 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
2042 if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
2044 else if (p->state == COMP_CRITICAL)
2046 gfc_error("%s statement at %C leaves CRITICAL construct",
2047 gfc_ascii_statement (st));
2050 else if ((sym && sym == p->sym) || (!sym && p->state == COMP_DO))
2056 gfc_error ("%s statement at %C is not within a construct",
2057 gfc_ascii_statement (st));
2059 gfc_error ("%s statement at %C is not within construct '%s'",
2060 gfc_ascii_statement (st), sym->name);
2065 /* Special checks for EXIT from non-loop constructs. */
2072 /* This is already handled above. */
2075 case COMP_ASSOCIATE:
2079 case COMP_SELECT_TYPE:
2081 if (op == EXEC_CYCLE)
2083 gfc_error ("CYCLE statement at %C is not applicable to non-loop"
2084 " construct '%s'", sym->name);
2087 gcc_assert (op == EXEC_EXIT);
2088 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: EXIT statement with no"
2089 " do-construct-name at %C") == FAILURE)
2094 gfc_error ("%s statement at %C is not applicable to construct '%s'",
2095 gfc_ascii_statement (st), sym->name);
2101 gfc_error ("%s statement at %C leaving OpenMP structured block",
2102 gfc_ascii_statement (st));
2106 for (o = p, cnt = 0; o->state == COMP_DO && o->previous != NULL; cnt++)
2110 && o->state == COMP_OMP_STRUCTURED_BLOCK
2111 && (o->head->op == EXEC_OMP_DO
2112 || o->head->op == EXEC_OMP_PARALLEL_DO))
2115 gcc_assert (o->head->next != NULL
2116 && (o->head->next->op == EXEC_DO
2117 || o->head->next->op == EXEC_DO_WHILE)
2118 && o->previous != NULL
2119 && o->previous->tail->op == o->head->op);
2120 if (o->previous->tail->ext.omp_clauses != NULL
2121 && o->previous->tail->ext.omp_clauses->collapse > 1)
2122 collapse = o->previous->tail->ext.omp_clauses->collapse;
2123 if (st == ST_EXIT && cnt <= collapse)
2125 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
2128 if (st == ST_CYCLE && cnt < collapse)
2130 gfc_error ("CYCLE statement at %C to non-innermost collapsed"
2136 /* Save the first statement in the construct - needed by the backend. */
2137 new_st.ext.which_construct = p->construct;
2145 /* Match the EXIT statement. */
2148 gfc_match_exit (void)
2150 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
2154 /* Match the CYCLE statement. */
2157 gfc_match_cycle (void)
2159 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
2163 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
2166 gfc_match_stopcode (gfc_statement st)
2173 if (gfc_match_eos () != MATCH_YES)
2175 m = gfc_match_init_expr (&e);
2176 if (m == MATCH_ERROR)
2181 if (gfc_match_eos () != MATCH_YES)
2185 if (gfc_pure (NULL))
2187 gfc_error ("%s statement not allowed in PURE procedure at %C",
2188 gfc_ascii_statement (st));
2192 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2194 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2200 if (!(e->ts.type == BT_CHARACTER || e->ts.type == BT_INTEGER))
2202 gfc_error ("STOP code at %L must be either INTEGER or CHARACTER type",
2209 gfc_error ("STOP code at %L must be scalar",
2214 if (e->ts.type == BT_CHARACTER
2215 && e->ts.kind != gfc_default_character_kind)
2217 gfc_error ("STOP code at %L must be default character KIND=%d",
2218 &e->where, (int) gfc_default_character_kind);
2222 if (e->ts.type == BT_INTEGER
2223 && e->ts.kind != gfc_default_integer_kind)
2225 gfc_error ("STOP code at %L must be default integer KIND=%d",
2226 &e->where, (int) gfc_default_integer_kind);
2234 new_st.op = EXEC_STOP;
2237 new_st.op = EXEC_ERROR_STOP;
2240 new_st.op = EXEC_PAUSE;
2247 new_st.ext.stop_code = -1;
2252 gfc_syntax_error (st);
2261 /* Match the (deprecated) PAUSE statement. */
2264 gfc_match_pause (void)
2268 m = gfc_match_stopcode (ST_PAUSE);
2271 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2280 /* Match the STOP statement. */
2283 gfc_match_stop (void)
2285 return gfc_match_stopcode (ST_STOP);
2289 /* Match the ERROR STOP statement. */
2292 gfc_match_error_stop (void)
2294 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2298 return gfc_match_stopcode (ST_ERROR_STOP);
2302 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2303 SYNC ALL [(sync-stat-list)]
2304 SYNC MEMORY [(sync-stat-list)]
2305 SYNC IMAGES (image-set [, sync-stat-list] )
2306 with sync-stat is int-expr or *. */
2309 sync_statement (gfc_statement st)
2312 gfc_expr *tmp, *imageset, *stat, *errmsg;
2313 bool saw_stat, saw_errmsg;
2315 tmp = imageset = stat = errmsg = NULL;
2316 saw_stat = saw_errmsg = false;
2318 if (gfc_pure (NULL))
2320 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2324 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2328 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2330 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2334 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2336 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2340 if (gfc_match_eos () == MATCH_YES)
2342 if (st == ST_SYNC_IMAGES)
2347 if (gfc_match_char ('(') != MATCH_YES)
2350 if (st == ST_SYNC_IMAGES)
2352 /* Denote '*' as imageset == NULL. */
2353 m = gfc_match_char ('*');
2354 if (m == MATCH_ERROR)
2358 if (gfc_match ("%e", &imageset) != MATCH_YES)
2361 m = gfc_match_char (',');
2362 if (m == MATCH_ERROR)
2366 m = gfc_match_char (')');
2375 m = gfc_match (" stat = %v", &tmp);
2376 if (m == MATCH_ERROR)
2382 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2388 if (gfc_match_char (',') == MATCH_YES)
2392 m = gfc_match (" errmsg = %v", &tmp);
2393 if (m == MATCH_ERROR)
2399 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2405 if (gfc_match_char (',') == MATCH_YES)
2409 gfc_gobble_whitespace ();
2411 if (gfc_peek_char () == ')')
2417 if (gfc_match (" )%t") != MATCH_YES)
2424 new_st.op = EXEC_SYNC_ALL;
2426 case ST_SYNC_IMAGES:
2427 new_st.op = EXEC_SYNC_IMAGES;
2429 case ST_SYNC_MEMORY:
2430 new_st.op = EXEC_SYNC_MEMORY;
2436 new_st.expr1 = imageset;
2437 new_st.expr2 = stat;
2438 new_st.expr3 = errmsg;
2443 gfc_syntax_error (st);
2446 gfc_free_expr (tmp);
2447 gfc_free_expr (imageset);
2448 gfc_free_expr (stat);
2449 gfc_free_expr (errmsg);
2455 /* Match SYNC ALL statement. */
2458 gfc_match_sync_all (void)
2460 return sync_statement (ST_SYNC_ALL);
2464 /* Match SYNC IMAGES statement. */
2467 gfc_match_sync_images (void)
2469 return sync_statement (ST_SYNC_IMAGES);
2473 /* Match SYNC MEMORY statement. */
2476 gfc_match_sync_memory (void)
2478 return sync_statement (ST_SYNC_MEMORY);
2482 /* Match a CONTINUE statement. */
2485 gfc_match_continue (void)
2487 if (gfc_match_eos () != MATCH_YES)
2489 gfc_syntax_error (ST_CONTINUE);
2493 new_st.op = EXEC_CONTINUE;
2498 /* Match the (deprecated) ASSIGN statement. */
2501 gfc_match_assign (void)
2504 gfc_st_label *label;
2506 if (gfc_match (" %l", &label) == MATCH_YES)
2508 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2510 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2512 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2517 expr->symtree->n.sym->attr.assign = 1;
2519 new_st.op = EXEC_LABEL_ASSIGN;
2520 new_st.label1 = label;
2521 new_st.expr1 = expr;
2529 /* Match the GO TO statement. As a computed GOTO statement is
2530 matched, it is transformed into an equivalent SELECT block. No
2531 tree is necessary, and the resulting jumps-to-jumps are
2532 specifically optimized away by the back end. */
2535 gfc_match_goto (void)
2537 gfc_code *head, *tail;
2540 gfc_st_label *label;
2544 if (gfc_match (" %l%t", &label) == MATCH_YES)
2546 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2549 new_st.op = EXEC_GOTO;
2550 new_st.label1 = label;
2554 /* The assigned GO TO statement. */
2556 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2558 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2563 new_st.op = EXEC_GOTO;
2564 new_st.expr1 = expr;
2566 if (gfc_match_eos () == MATCH_YES)
2569 /* Match label list. */
2570 gfc_match_char (',');
2571 if (gfc_match_char ('(') != MATCH_YES)
2573 gfc_syntax_error (ST_GOTO);
2580 m = gfc_match_st_label (&label);
2584 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2588 head = tail = gfc_get_code ();
2591 tail->block = gfc_get_code ();
2595 tail->label1 = label;
2596 tail->op = EXEC_GOTO;
2598 while (gfc_match_char (',') == MATCH_YES);
2600 if (gfc_match (")%t") != MATCH_YES)
2605 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2608 new_st.block = head;
2613 /* Last chance is a computed GO TO statement. */
2614 if (gfc_match_char ('(') != MATCH_YES)
2616 gfc_syntax_error (ST_GOTO);
2625 m = gfc_match_st_label (&label);
2629 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2633 head = tail = gfc_get_code ();
2636 tail->block = gfc_get_code ();
2640 cp = gfc_get_case ();
2641 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2644 tail->op = EXEC_SELECT;
2645 tail->ext.case_list = cp;
2647 tail->next = gfc_get_code ();
2648 tail->next->op = EXEC_GOTO;
2649 tail->next->label1 = label;
2651 while (gfc_match_char (',') == MATCH_YES);
2653 if (gfc_match_char (')') != MATCH_YES)
2658 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2662 /* Get the rest of the statement. */
2663 gfc_match_char (',');
2665 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2668 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2669 "at %C") == FAILURE)
2672 /* At this point, a computed GOTO has been fully matched and an
2673 equivalent SELECT statement constructed. */
2675 new_st.op = EXEC_SELECT;
2676 new_st.expr1 = NULL;
2678 /* Hack: For a "real" SELECT, the expression is in expr. We put
2679 it in expr2 so we can distinguish then and produce the correct
2681 new_st.expr2 = expr;
2682 new_st.block = head;
2686 gfc_syntax_error (ST_GOTO);
2688 gfc_free_statements (head);
2693 /* Frees a list of gfc_alloc structures. */
2696 gfc_free_alloc_list (gfc_alloc *p)
2703 gfc_free_expr (p->expr);
2709 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2710 an accessible derived type. */
2713 match_derived_type_spec (gfc_typespec *ts)
2715 char name[GFC_MAX_SYMBOL_LEN + 1];
2717 gfc_symbol *derived;
2719 old_locus = gfc_current_locus;
2721 if (gfc_match ("%n", name) != MATCH_YES)
2723 gfc_current_locus = old_locus;
2727 gfc_find_symbol (name, NULL, 1, &derived);
2729 if (derived && derived->attr.flavor == FL_DERIVED)
2731 ts->type = BT_DERIVED;
2732 ts->u.derived = derived;
2736 gfc_current_locus = old_locus;
2741 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2742 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2743 It only includes the intrinsic types from the Fortran 2003 standard
2744 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2745 the implicit_flag is not needed, so it was removed. Derived types are
2746 identified by their name alone. */
2749 match_type_spec (gfc_typespec *ts)
2755 gfc_gobble_whitespace ();
2756 old_locus = gfc_current_locus;
2758 if (match_derived_type_spec (ts) == MATCH_YES)
2760 /* Enforce F03:C401. */
2761 if (ts->u.derived->attr.abstract)
2763 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2764 ts->u.derived->name, &old_locus);
2770 if (gfc_match ("integer") == MATCH_YES)
2772 ts->type = BT_INTEGER;
2773 ts->kind = gfc_default_integer_kind;
2777 if (gfc_match ("real") == MATCH_YES)
2780 ts->kind = gfc_default_real_kind;
2784 if (gfc_match ("double precision") == MATCH_YES)
2787 ts->kind = gfc_default_double_kind;
2791 if (gfc_match ("complex") == MATCH_YES)
2793 ts->type = BT_COMPLEX;
2794 ts->kind = gfc_default_complex_kind;
2798 if (gfc_match ("character") == MATCH_YES)
2800 ts->type = BT_CHARACTER;
2802 m = gfc_match_char_spec (ts);
2810 if (gfc_match ("logical") == MATCH_YES)
2812 ts->type = BT_LOGICAL;
2813 ts->kind = gfc_default_logical_kind;
2817 /* If a type is not matched, simply return MATCH_NO. */
2818 gfc_current_locus = old_locus;
2823 gfc_gobble_whitespace ();
2824 if (gfc_peek_ascii_char () == '*')
2826 gfc_error ("Invalid type-spec at %C");
2830 m = gfc_match_kind_spec (ts, false);
2833 m = MATCH_YES; /* No kind specifier found. */
2839 /* Match an ALLOCATE statement. */
2842 gfc_match_allocate (void)
2844 gfc_alloc *head, *tail;
2845 gfc_expr *stat, *errmsg, *tmp, *source, *mold;
2849 locus old_locus, deferred_locus;
2850 bool saw_stat, saw_errmsg, saw_source, saw_mold, saw_deferred, b1, b2, b3;
2853 stat = errmsg = source = mold = tmp = NULL;
2854 saw_stat = saw_errmsg = saw_source = saw_mold = saw_deferred = false;
2856 if (gfc_match_char ('(') != MATCH_YES)
2859 /* Match an optional type-spec. */
2860 old_locus = gfc_current_locus;
2861 m = match_type_spec (&ts);
2862 if (m == MATCH_ERROR)
2864 else if (m == MATCH_NO)
2866 char name[GFC_MAX_SYMBOL_LEN + 3];
2868 if (gfc_match ("%n :: ", name) == MATCH_YES)
2870 gfc_error ("Error in type-spec at %L", &old_locus);
2874 ts.type = BT_UNKNOWN;
2878 if (gfc_match (" :: ") == MATCH_YES)
2880 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2881 "ALLOCATE at %L", &old_locus) == FAILURE)
2886 gfc_error ("Type-spec at %L cannot contain a deferred "
2887 "type parameter", &old_locus);
2893 ts.type = BT_UNKNOWN;
2894 gfc_current_locus = old_locus;
2901 head = tail = gfc_get_alloc ();
2904 tail->next = gfc_get_alloc ();
2908 m = gfc_match_variable (&tail->expr, 0);
2911 if (m == MATCH_ERROR)
2914 if (gfc_check_do_variable (tail->expr->symtree))
2917 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2919 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2923 if (tail->expr->ts.deferred)
2925 saw_deferred = true;
2926 deferred_locus = tail->expr->where;
2929 /* The ALLOCATE statement had an optional typespec. Check the
2931 if (ts.type != BT_UNKNOWN)
2933 /* Enforce F03:C624. */
2934 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2936 gfc_error ("Type of entity at %L is type incompatible with "
2937 "typespec", &tail->expr->where);
2941 /* Enforce F03:C627. */
2942 if (ts.kind != tail->expr->ts.kind)
2944 gfc_error ("Kind type parameter for entity at %L differs from "
2945 "the kind type parameter of the typespec",
2946 &tail->expr->where);
2951 if (tail->expr->ts.type == BT_DERIVED)
2952 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2954 /* FIXME: disable the checking on derived types and arrays. */
2955 sym = tail->expr->symtree->n.sym;
2956 b1 = !(tail->expr->ref
2957 && (tail->expr->ref->type == REF_COMPONENT
2958 || tail->expr->ref->type == REF_ARRAY));
2959 if (sym && sym->ts.type == BT_CLASS && sym->attr.class_ok)
2960 b2 = !(CLASS_DATA (sym)->attr.allocatable
2961 || CLASS_DATA (sym)->attr.class_pointer);
2963 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2964 || sym->attr.proc_pointer);
2965 b3 = sym && sym->ns && sym->ns->proc_name
2966 && (sym->ns->proc_name->attr.allocatable
2967 || sym->ns->proc_name->attr.pointer
2968 || sym->ns->proc_name->attr.proc_pointer);
2969 if (b1 && b2 && !b3)
2971 gfc_error ("Allocate-object at %L is not a nonprocedure pointer "
2972 "or an allocatable variable", &tail->expr->where);
2976 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2978 gfc_error ("Shape specification for allocatable scalar at %C");
2982 if (gfc_match_char (',') != MATCH_YES)
2987 m = gfc_match (" stat = %v", &tmp);
2988 if (m == MATCH_ERROR)
2995 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3003 if (gfc_check_do_variable (stat->symtree))
3006 if (gfc_match_char (',') == MATCH_YES)
3007 goto alloc_opt_list;
3010 m = gfc_match (" errmsg = %v", &tmp);
3011 if (m == MATCH_ERROR)
3015 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
3016 &tmp->where) == FAILURE)
3022 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3030 if (gfc_match_char (',') == MATCH_YES)
3031 goto alloc_opt_list;
3034 m = gfc_match (" source = %e", &tmp);
3035 if (m == MATCH_ERROR)
3039 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
3040 &tmp->where) == FAILURE)
3046 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
3050 /* The next 2 conditionals check C631. */
3051 if (ts.type != BT_UNKNOWN)
3053 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
3054 &tmp->where, &old_locus);
3060 gfc_error ("SOURCE tag at %L requires only a single entity in "
3061 "the allocation-list", &tmp->where);
3069 if (gfc_match_char (',') == MATCH_YES)
3070 goto alloc_opt_list;
3073 m = gfc_match (" mold = %e", &tmp);
3074 if (m == MATCH_ERROR)
3078 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: MOLD tag at %L",
3079 &tmp->where) == FAILURE)
3082 /* Check F08:C636. */
3085 gfc_error ("Redundant MOLD tag found at %L ", &tmp->where);
3089 /* Check F08:C637. */
3090 if (ts.type != BT_UNKNOWN)
3092 gfc_error ("MOLD tag at %L conflicts with the typespec at %L",
3093 &tmp->where, &old_locus);
3102 if (gfc_match_char (',') == MATCH_YES)
3103 goto alloc_opt_list;
3106 gfc_gobble_whitespace ();
3108 if (gfc_peek_char () == ')')
3112 if (gfc_match (" )%t") != MATCH_YES)
3115 /* Check F08:C637. */
3118 gfc_error ("MOLD tag at %L conflicts with SOURCE tag at %L",
3119 &mold->where, &source->where);
3123 /* Check F03:C623, */
3124 if (saw_deferred && ts.type == BT_UNKNOWN && !source)
3126 gfc_error ("Allocate-object at %L with a deferred type parameter "
3127 "requires either a type-spec or SOURCE tag", &deferred_locus);
3131 new_st.op = EXEC_ALLOCATE;
3132 new_st.expr1 = stat;
3133 new_st.expr2 = errmsg;
3135 new_st.expr3 = source;
3137 new_st.expr3 = mold;
3138 new_st.ext.alloc.list = head;
3139 new_st.ext.alloc.ts = ts;
3144 gfc_syntax_error (ST_ALLOCATE);
3147 gfc_free_expr (errmsg);
3148 gfc_free_expr (source);
3149 gfc_free_expr (stat);
3150 gfc_free_expr (mold);
3151 if (tmp && tmp->expr_type) gfc_free_expr (tmp);
3152 gfc_free_alloc_list (head);
3157 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
3158 a set of pointer assignments to intrinsic NULL(). */
3161 gfc_match_nullify (void)
3169 if (gfc_match_char ('(') != MATCH_YES)
3174 m = gfc_match_variable (&p, 0);
3175 if (m == MATCH_ERROR)
3180 if (gfc_check_do_variable (p->symtree))
3183 /* build ' => NULL() '. */
3184 e = gfc_get_null_expr (&gfc_current_locus);
3186 /* Chain to list. */
3191 tail->next = gfc_get_code ();
3195 tail->op = EXEC_POINTER_ASSIGN;
3199 if (gfc_match (" )%t") == MATCH_YES)
3201 if (gfc_match_char (',') != MATCH_YES)
3208 gfc_syntax_error (ST_NULLIFY);
3211 gfc_free_statements (new_st.next);
3213 gfc_free_expr (new_st.expr1);
3214 new_st.expr1 = NULL;
3215 gfc_free_expr (new_st.expr2);
3216 new_st.expr2 = NULL;
3221 /* Match a DEALLOCATE statement. */
3224 gfc_match_deallocate (void)
3226 gfc_alloc *head, *tail;
3227 gfc_expr *stat, *errmsg, *tmp;
3230 bool saw_stat, saw_errmsg, b1, b2;
3233 stat = errmsg = tmp = NULL;
3234 saw_stat = saw_errmsg = false;
3236 if (gfc_match_char ('(') != MATCH_YES)
3242 head = tail = gfc_get_alloc ();
3245 tail->next = gfc_get_alloc ();
3249 m = gfc_match_variable (&tail->expr, 0);
3250 if (m == MATCH_ERROR)
3255 if (gfc_check_do_variable (tail->expr->symtree))
3258 sym = tail->expr->symtree->n.sym;
3260 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3262 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3266 /* FIXME: disable the checking on derived types. */
3267 b1 = !(tail->expr->ref
3268 && (tail->expr->ref->type == REF_COMPONENT
3269 || tail->expr->ref->type == REF_ARRAY));
3270 if (sym && sym->ts.type == BT_CLASS)
3271 b2 = !(CLASS_DATA (sym)->attr.allocatable
3272 || CLASS_DATA (sym)->attr.class_pointer);
3274 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3275 || sym->attr.proc_pointer);
3278 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3279 "or an allocatable variable");
3283 if (gfc_match_char (',') != MATCH_YES)
3288 m = gfc_match (" stat = %v", &tmp);
3289 if (m == MATCH_ERROR)
3295 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3296 gfc_free_expr (tmp);
3303 if (gfc_check_do_variable (stat->symtree))
3306 if (gfc_match_char (',') == MATCH_YES)
3307 goto dealloc_opt_list;
3310 m = gfc_match (" errmsg = %v", &tmp);
3311 if (m == MATCH_ERROR)
3315 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3316 &tmp->where) == FAILURE)
3321 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3322 gfc_free_expr (tmp);
3329 if (gfc_match_char (',') == MATCH_YES)
3330 goto dealloc_opt_list;
3333 gfc_gobble_whitespace ();
3335 if (gfc_peek_char () == ')')
3339 if (gfc_match (" )%t") != MATCH_YES)
3342 new_st.op = EXEC_DEALLOCATE;
3343 new_st.expr1 = stat;
3344 new_st.expr2 = errmsg;
3345 new_st.ext.alloc.list = head;
3350 gfc_syntax_error (ST_DEALLOCATE);
3353 gfc_free_expr (errmsg);
3354 gfc_free_expr (stat);
3355 gfc_free_alloc_list (head);
3360 /* Match a RETURN statement. */
3363 gfc_match_return (void)
3367 gfc_compile_state s;
3371 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3373 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3377 if (gfc_match_eos () == MATCH_YES)
3380 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3382 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3387 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3388 "at %C") == FAILURE)
3391 if (gfc_current_form == FORM_FREE)
3393 /* The following are valid, so we can't require a blank after the
3397 char c = gfc_peek_ascii_char ();
3398 if (ISALPHA (c) || ISDIGIT (c))
3402 m = gfc_match (" %e%t", &e);
3405 if (m == MATCH_ERROR)
3408 gfc_syntax_error (ST_RETURN);
3415 gfc_enclosing_unit (&s);
3416 if (s == COMP_PROGRAM
3417 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3418 "main program at %C") == FAILURE)
3421 new_st.op = EXEC_RETURN;
3428 /* Match the call of a type-bound procedure, if CALL%var has already been
3429 matched and var found to be a derived-type variable. */
3432 match_typebound_call (gfc_symtree* varst)
3437 base = gfc_get_expr ();
3438 base->expr_type = EXPR_VARIABLE;
3439 base->symtree = varst;
3440 base->where = gfc_current_locus;
3441 gfc_set_sym_referenced (varst->n.sym);
3443 m = gfc_match_varspec (base, 0, true, true);
3445 gfc_error ("Expected component reference at %C");
3449 if (gfc_match_eos () != MATCH_YES)
3451 gfc_error ("Junk after CALL at %C");
3455 if (base->expr_type == EXPR_COMPCALL)
3456 new_st.op = EXEC_COMPCALL;
3457 else if (base->expr_type == EXPR_PPC)
3458 new_st.op = EXEC_CALL_PPC;
3461 gfc_error ("Expected type-bound procedure or procedure pointer component "
3465 new_st.expr1 = base;
3471 /* Match a CALL statement. The tricky part here are possible
3472 alternate return specifiers. We handle these by having all
3473 "subroutines" actually return an integer via a register that gives
3474 the return number. If the call specifies alternate returns, we
3475 generate code for a SELECT statement whose case clauses contain
3476 GOTOs to the various labels. */
3479 gfc_match_call (void)
3481 char name[GFC_MAX_SYMBOL_LEN + 1];
3482 gfc_actual_arglist *a, *arglist;
3492 m = gfc_match ("% %n", name);
3498 if (gfc_get_ha_sym_tree (name, &st))
3503 /* If this is a variable of derived-type, it probably starts a type-bound
3505 if ((sym->attr.flavor != FL_PROCEDURE
3506 || gfc_is_function_return_value (sym, gfc_current_ns))
3507 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3508 return match_typebound_call (st);
3510 /* If it does not seem to be callable (include functions so that the
3511 right association is made. They are thrown out in resolution.)
3513 if (!sym->attr.generic
3514 && !sym->attr.subroutine
3515 && !sym->attr.function)
3517 if (!(sym->attr.external && !sym->attr.referenced))
3519 /* ...create a symbol in this scope... */
3520 if (sym->ns != gfc_current_ns
3521 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3524 if (sym != st->n.sym)
3528 /* ...and then to try to make the symbol into a subroutine. */
3529 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3533 gfc_set_sym_referenced (sym);
3535 if (gfc_match_eos () != MATCH_YES)
3537 m = gfc_match_actual_arglist (1, &arglist);
3540 if (m == MATCH_ERROR)
3543 if (gfc_match_eos () != MATCH_YES)
3547 /* If any alternate return labels were found, construct a SELECT
3548 statement that will jump to the right place. */
3551 for (a = arglist; a; a = a->next)
3552 if (a->expr == NULL)
3557 gfc_symtree *select_st;
3558 gfc_symbol *select_sym;
3559 char name[GFC_MAX_SYMBOL_LEN + 1];
3561 new_st.next = c = gfc_get_code ();
3562 c->op = EXEC_SELECT;
3563 sprintf (name, "_result_%s", sym->name);
3564 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3566 select_sym = select_st->n.sym;
3567 select_sym->ts.type = BT_INTEGER;
3568 select_sym->ts.kind = gfc_default_integer_kind;
3569 gfc_set_sym_referenced (select_sym);
3570 c->expr1 = gfc_get_expr ();
3571 c->expr1->expr_type = EXPR_VARIABLE;
3572 c->expr1->symtree = select_st;
3573 c->expr1->ts = select_sym->ts;
3574 c->expr1->where = gfc_current_locus;
3577 for (a = arglist; a; a = a->next)
3579 if (a->expr != NULL)
3582 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3587 c->block = gfc_get_code ();
3589 c->op = EXEC_SELECT;
3591 new_case = gfc_get_case ();
3592 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3593 new_case->low = new_case->high;
3594 c->ext.case_list = new_case;
3596 c->next = gfc_get_code ();
3597 c->next->op = EXEC_GOTO;
3598 c->next->label1 = a->label;
3602 new_st.op = EXEC_CALL;
3603 new_st.symtree = st;
3604 new_st.ext.actual = arglist;
3609 gfc_syntax_error (ST_CALL);
3612 gfc_free_actual_arglist (arglist);
3617 /* Given a name, return a pointer to the common head structure,
3618 creating it if it does not exist. If FROM_MODULE is nonzero, we
3619 mangle the name so that it doesn't interfere with commons defined
3620 in the using namespace.
3621 TODO: Add to global symbol tree. */
3624 gfc_get_common (const char *name, int from_module)
3627 static int serial = 0;
3628 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3632 /* A use associated common block is only needed to correctly layout
3633 the variables it contains. */
3634 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3635 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3639 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3642 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3645 if (st->n.common == NULL)
3647 st->n.common = gfc_get_common_head ();
3648 st->n.common->where = gfc_current_locus;
3649 strcpy (st->n.common->name, name);
3652 return st->n.common;
3656 /* Match a common block name. */
3658 match match_common_name (char *name)
3662 if (gfc_match_char ('/') == MATCH_NO)
3668 if (gfc_match_char ('/') == MATCH_YES)
3674 m = gfc_match_name (name);
3676 if (m == MATCH_ERROR)
3678 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3681 gfc_error ("Syntax error in common block name at %C");
3686 /* Match a COMMON statement. */
3689 gfc_match_common (void)
3691 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3692 char name[GFC_MAX_SYMBOL_LEN + 1];
3699 old_blank_common = gfc_current_ns->blank_common.head;
3700 if (old_blank_common)
3702 while (old_blank_common->common_next)
3703 old_blank_common = old_blank_common->common_next;
3710 m = match_common_name (name);
3711 if (m == MATCH_ERROR)
3714 gsym = gfc_get_gsymbol (name);
3715 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3717 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3718 "is not COMMON", name);
3722 if (gsym->type == GSYM_UNKNOWN)
3724 gsym->type = GSYM_COMMON;
3725 gsym->where = gfc_current_locus;
3731 if (name[0] == '\0')
3733 t = &gfc_current_ns->blank_common;
3734 if (t->head == NULL)
3735 t->where = gfc_current_locus;
3739 t = gfc_get_common (name, 0);
3748 while (tail->common_next)
3749 tail = tail->common_next;
3752 /* Grab the list of symbols. */
3755 m = gfc_match_symbol (&sym, 0);
3756 if (m == MATCH_ERROR)
3761 /* Store a ref to the common block for error checking. */
3762 sym->common_block = t;
3764 /* See if we know the current common block is bind(c), and if
3765 so, then see if we can check if the symbol is (which it'll
3766 need to be). This can happen if the bind(c) attr stmt was
3767 applied to the common block, and the variable(s) already
3768 defined, before declaring the common block. */
3769 if (t->is_bind_c == 1)
3771 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3773 /* If we find an error, just print it and continue,
3774 cause it's just semantic, and we can see if there
3776 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3777 "at %C must be declared with a C "
3778 "interoperable kind since common block "
3780 sym->name, &(sym->declared_at), t->name,
3784 if (sym->attr.is_bind_c == 1)
3785 gfc_error_now ("Variable '%s' in common block "
3786 "'%s' at %C can not be bind(c) since "
3787 "it is not global", sym->name, t->name);
3790 if (sym->attr.in_common)
3792 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3797 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3798 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3800 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3801 "can only be COMMON in "
3802 "BLOCK DATA", sym->name)
3807 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3811 tail->common_next = sym;
3817 /* Deal with an optional array specification after the
3819 m = gfc_match_array_spec (&as, true, true);
3820 if (m == MATCH_ERROR)
3825 if (as->type != AS_EXPLICIT)
3827 gfc_error ("Array specification for symbol '%s' in COMMON "
3828 "at %C must be explicit", sym->name);
3832 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3835 if (sym->attr.pointer)
3837 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3838 "POINTER array", sym->name);
3847 sym->common_head = t;
3849 /* Check to see if the symbol is already in an equivalence group.
3850 If it is, set the other members as being in common. */
3851 if (sym->attr.in_equivalence)
3853 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3855 for (e2 = e1; e2; e2 = e2->eq)
3856 if (e2->expr->symtree->n.sym == sym)
3863 for (e2 = e1; e2; e2 = e2->eq)
3865 other = e2->expr->symtree->n.sym;
3866 if (other->common_head
3867 && other->common_head != sym->common_head)
3869 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3870 "%C is being indirectly equivalenced to "
3871 "another COMMON block '%s'",
3872 sym->name, sym->common_head->name,
3873 other->common_head->name);
3876 other->attr.in_common = 1;
3877 other->common_head = t;
3883 gfc_gobble_whitespace ();
3884 if (gfc_match_eos () == MATCH_YES)
3886 if (gfc_peek_ascii_char () == '/')
3888 if (gfc_match_char (',') != MATCH_YES)
3890 gfc_gobble_whitespace ();
3891 if (gfc_peek_ascii_char () == '/')
3900 gfc_syntax_error (ST_COMMON);
3903 if (old_blank_common)
3904 old_blank_common->common_next = NULL;
3906 gfc_current_ns->blank_common.head = NULL;
3907 gfc_free_array_spec (as);
3912 /* Match a BLOCK DATA program unit. */
3915 gfc_match_block_data (void)
3917 char name[GFC_MAX_SYMBOL_LEN + 1];
3921 if (gfc_match_eos () == MATCH_YES)
3923 gfc_new_block = NULL;
3927 m = gfc_match ("% %n%t", name);
3931 if (gfc_get_symbol (name, NULL, &sym))
3934 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3937 gfc_new_block = sym;
3943 /* Free a namelist structure. */
3946 gfc_free_namelist (gfc_namelist *name)
3950 for (; name; name = n)
3958 /* Match a NAMELIST statement. */
3961 gfc_match_namelist (void)
3963 gfc_symbol *group_name, *sym;
3967 m = gfc_match (" / %s /", &group_name);
3970 if (m == MATCH_ERROR)
3975 if (group_name->ts.type != BT_UNKNOWN)
3977 gfc_error ("Namelist group name '%s' at %C already has a basic "
3978 "type of %s", group_name->name,
3979 gfc_typename (&group_name->ts));
3983 if (group_name->attr.flavor == FL_NAMELIST
3984 && group_name->attr.use_assoc
3985 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
3986 "at %C already is USE associated and can"
3987 "not be respecified.", group_name->name)
3991 if (group_name->attr.flavor != FL_NAMELIST
3992 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
3993 group_name->name, NULL) == FAILURE)
3998 m = gfc_match_symbol (&sym, 1);
4001 if (m == MATCH_ERROR)
4004 if (sym->attr.in_namelist == 0
4005 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
4008 /* Use gfc_error_check here, rather than goto error, so that
4009 these are the only errors for the next two lines. */
4010 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
4012 gfc_error ("Assumed size array '%s' in namelist '%s' at "
4013 "%C is not allowed", sym->name, group_name->name);
4017 if (sym->ts.type == BT_CHARACTER && sym->ts.u.cl->length == NULL)
4019 gfc_error ("Assumed character length '%s' in namelist '%s' at "
4020 "%C is not allowed", sym->name, group_name->name);
4024 nl = gfc_get_namelist ();
4028 if (group_name->namelist == NULL)
4029 group_name->namelist = group_name->namelist_tail = nl;
4032 group_name->namelist_tail->next = nl;
4033 group_name->namelist_tail = nl;
4036 if (gfc_match_eos () == MATCH_YES)
4039 m = gfc_match_char (',');
4041 if (gfc_match_char ('/') == MATCH_YES)
4043 m2 = gfc_match (" %s /", &group_name);
4044 if (m2 == MATCH_YES)
4046 if (m2 == MATCH_ERROR)
4060 gfc_syntax_error (ST_NAMELIST);
4067 /* Match a MODULE statement. */
4070 gfc_match_module (void)
4074 m = gfc_match (" %s%t", &gfc_new_block);
4078 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
4079 gfc_new_block->name, NULL) == FAILURE)
4086 /* Free equivalence sets and lists. Recursively is the easiest way to
4090 gfc_free_equiv_until (gfc_equiv *eq, gfc_equiv *stop)
4095 gfc_free_equiv (eq->eq);
4096 gfc_free_equiv_until (eq->next, stop);
4097 gfc_free_expr (eq->expr);
4103 gfc_free_equiv (gfc_equiv *eq)
4105 gfc_free_equiv_until (eq, NULL);
4109 /* Match an EQUIVALENCE statement. */
4112 gfc_match_equivalence (void)
4114 gfc_equiv *eq, *set, *tail;
4118 gfc_common_head *common_head = NULL;
4126 eq = gfc_get_equiv ();
4130 eq->next = gfc_current_ns->equiv;
4131 gfc_current_ns->equiv = eq;
4133 if (gfc_match_char ('(') != MATCH_YES)
4137 common_flag = FALSE;
4142 m = gfc_match_equiv_variable (&set->expr);
4143 if (m == MATCH_ERROR)
4148 /* count the number of objects. */
4151 if (gfc_match_char ('%') == MATCH_YES)
4153 gfc_error ("Derived type component %C is not a "
4154 "permitted EQUIVALENCE member");
4158 for (ref = set->expr->ref; ref; ref = ref->next)
4159 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
4161 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
4162 "be an array section");
4166 sym = set->expr->symtree->n.sym;
4168 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
4171 if (sym->attr.in_common)
4174 common_head = sym->common_head;
4177 if (gfc_match_char (')') == MATCH_YES)
4180 if (gfc_match_char (',') != MATCH_YES)
4183 set->eq = gfc_get_equiv ();
4189 gfc_error ("EQUIVALENCE at %C requires two or more objects");
4193 /* If one of the members of an equivalence is in common, then
4194 mark them all as being in common. Before doing this, check
4195 that members of the equivalence group are not in different
4198 for (set = eq; set; set = set->eq)
4200 sym = set->expr->symtree->n.sym;
4201 if (sym->common_head && sym->common_head != common_head)
4203 gfc_error ("Attempt to indirectly overlap COMMON "
4204 "blocks %s and %s by EQUIVALENCE at %C",
4205 sym->common_head->name, common_head->name);
4208 sym->attr.in_common = 1;
4209 sym->common_head = common_head;
4212 if (gfc_match_eos () == MATCH_YES)
4214 if (gfc_match_char (',') != MATCH_YES)
4216 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
4224 gfc_syntax_error (ST_EQUIVALENCE);
4230 gfc_free_equiv (gfc_current_ns->equiv);
4231 gfc_current_ns->equiv = eq;
4237 /* Check that a statement function is not recursive. This is done by looking
4238 for the statement function symbol(sym) by looking recursively through its
4239 expression(e). If a reference to sym is found, true is returned.
4240 12.5.4 requires that any variable of function that is implicitly typed
4241 shall have that type confirmed by any subsequent type declaration. The
4242 implicit typing is conveniently done here. */
4244 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4247 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4253 switch (e->expr_type)
4256 if (e->symtree == NULL)
4259 /* Check the name before testing for nested recursion! */
4260 if (sym->name == e->symtree->n.sym->name)
4263 /* Catch recursion via other statement functions. */
4264 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4265 && e->symtree->n.sym->value
4266 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4269 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4270 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4275 if (e->symtree && sym->name == e->symtree->n.sym->name)
4278 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4279 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4291 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4293 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4297 /* Match a statement function declaration. It is so easy to match
4298 non-statement function statements with a MATCH_ERROR as opposed to
4299 MATCH_NO that we suppress error message in most cases. */
4302 gfc_match_st_function (void)
4304 gfc_error_buf old_error;
4309 m = gfc_match_symbol (&sym, 0);
4313 gfc_push_error (&old_error);
4315 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4316 sym->name, NULL) == FAILURE)
4319 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4322 m = gfc_match (" = %e%t", &expr);
4326 gfc_free_error (&old_error);
4327 if (m == MATCH_ERROR)
4330 if (recursive_stmt_fcn (expr, sym))
4332 gfc_error ("Statement function at %L is recursive", &expr->where);
4338 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4339 "Statement function at %C") == FAILURE)
4345 gfc_pop_error (&old_error);
4350 /***************** SELECT CASE subroutines ******************/
4352 /* Free a single case structure. */
4355 free_case (gfc_case *p)
4357 if (p->low == p->high)
4359 gfc_free_expr (p->low);
4360 gfc_free_expr (p->high);
4365 /* Free a list of case structures. */
4368 gfc_free_case_list (gfc_case *p)
4380 /* Match a single case selector. */
4383 match_case_selector (gfc_case **cp)
4388 c = gfc_get_case ();
4389 c->where = gfc_current_locus;
4391 if (gfc_match_char (':') == MATCH_YES)
4393 m = gfc_match_init_expr (&c->high);
4396 if (m == MATCH_ERROR)
4401 m = gfc_match_init_expr (&c->low);
4402 if (m == MATCH_ERROR)
4407 /* If we're not looking at a ':' now, make a range out of a single
4408 target. Else get the upper bound for the case range. */
4409 if (gfc_match_char (':') != MATCH_YES)
4413 m = gfc_match_init_expr (&c->high);
4414 if (m == MATCH_ERROR)
4416 /* MATCH_NO is fine. It's OK if nothing is there! */
4424 gfc_error ("Expected initialization expression in CASE at %C");
4432 /* Match the end of a case statement. */
4435 match_case_eos (void)
4437 char name[GFC_MAX_SYMBOL_LEN + 1];
4440 if (gfc_match_eos () == MATCH_YES)
4443 /* If the case construct doesn't have a case-construct-name, we
4444 should have matched the EOS. */
4445 if (!gfc_current_block ())
4448 gfc_gobble_whitespace ();
4450 m = gfc_match_name (name);
4454 if (strcmp (name, gfc_current_block ()->name) != 0)
4456 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4457 gfc_current_block ()->name);
4461 return gfc_match_eos ();
4465 /* Match a SELECT statement. */
4468 gfc_match_select (void)
4473 m = gfc_match_label ();
4474 if (m == MATCH_ERROR)
4477 m = gfc_match (" select case ( %e )%t", &expr);
4481 new_st.op = EXEC_SELECT;
4482 new_st.expr1 = expr;
4488 /* Push the current selector onto the SELECT TYPE stack. */
4491 select_type_push (gfc_symbol *sel)
4493 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4494 top->selector = sel;
4496 top->prev = select_type_stack;
4498 select_type_stack = top;
4502 /* Set the temporary for the current SELECT TYPE selector. */
4505 select_type_set_tmp (gfc_typespec *ts)
4507 char name[GFC_MAX_SYMBOL_LEN];
4512 select_type_stack->tmp = NULL;
4516 if (!gfc_type_is_extensible (ts->u.derived))
4519 if (ts->type == BT_CLASS)
4520 sprintf (name, "__tmp_class_%s", ts->u.derived->name);
4522 sprintf (name, "__tmp_type_%s", ts->u.derived->name);
4523 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4524 gfc_add_type (tmp->n.sym, ts, NULL);
4525 gfc_set_sym_referenced (tmp->n.sym);
4526 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4527 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4528 if (ts->type == BT_CLASS)
4530 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4531 &tmp->n.sym->as, false);
4532 tmp->n.sym->attr.class_ok = 1;
4534 tmp->n.sym->attr.select_type_temporary = 1;
4536 /* Add an association for it, so the rest of the parser knows it is
4537 an associate-name. The target will be set during resolution. */
4538 tmp->n.sym->assoc = gfc_get_association_list ();
4539 tmp->n.sym->assoc->dangling = 1;
4540 tmp->n.sym->assoc->st = tmp;
4542 select_type_stack->tmp = tmp;
4546 /* Match a SELECT TYPE statement. */
4549 gfc_match_select_type (void)
4551 gfc_expr *expr1, *expr2 = NULL;
4553 char name[GFC_MAX_SYMBOL_LEN];
4555 m = gfc_match_label ();
4556 if (m == MATCH_ERROR)
4559 m = gfc_match (" select type ( ");
4563 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4565 m = gfc_match (" %n => %e", name, &expr2);
4568 expr1 = gfc_get_expr();
4569 expr1->expr_type = EXPR_VARIABLE;
4570 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4575 if (expr2->ts.type == BT_UNKNOWN)
4576 expr1->symtree->n.sym->attr.untyped = 1;
4578 expr1->symtree->n.sym->ts = expr2->ts;
4579 expr1->symtree->n.sym->attr.flavor = FL_VARIABLE;
4580 expr1->symtree->n.sym->attr.referenced = 1;
4581 expr1->symtree->n.sym->attr.class_ok = 1;
4585 m = gfc_match (" %e ", &expr1);
4590 m = gfc_match (" )%t");
4594 /* Check for F03:C811. */
4595 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4597 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4598 "use associate-name=>");
4603 new_st.op = EXEC_SELECT_TYPE;
4604 new_st.expr1 = expr1;
4605 new_st.expr2 = expr2;
4606 new_st.ext.block.ns = gfc_current_ns;
4608 select_type_push (expr1->symtree->n.sym);
4613 gfc_current_ns = gfc_current_ns->parent;
4618 /* Match a CASE statement. */
4621 gfc_match_case (void)
4623 gfc_case *c, *head, *tail;
4628 if (gfc_current_state () != COMP_SELECT)
4630 gfc_error ("Unexpected CASE statement at %C");
4634 if (gfc_match ("% default") == MATCH_YES)
4636 m = match_case_eos ();
4639 if (m == MATCH_ERROR)
4642 new_st.op = EXEC_SELECT;
4643 c = gfc_get_case ();
4644 c->where = gfc_current_locus;
4645 new_st.ext.case_list = c;
4649 if (gfc_match_char ('(') != MATCH_YES)
4654 if (match_case_selector (&c) == MATCH_ERROR)
4664 if (gfc_match_char (')') == MATCH_YES)
4666 if (gfc_match_char (',') != MATCH_YES)
4670 m = match_case_eos ();
4673 if (m == MATCH_ERROR)
4676 new_st.op = EXEC_SELECT;
4677 new_st.ext.case_list = head;
4682 gfc_error ("Syntax error in CASE specification at %C");
4685 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4690 /* Match a TYPE IS statement. */
4693 gfc_match_type_is (void)
4698 if (gfc_current_state () != COMP_SELECT_TYPE)
4700 gfc_error ("Unexpected TYPE IS statement at %C");
4704 if (gfc_match_char ('(') != MATCH_YES)
4707 c = gfc_get_case ();
4708 c->where = gfc_current_locus;
4710 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4711 match_type_spec here. */
4712 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4715 if (gfc_match_char (')') != MATCH_YES)
4718 m = match_case_eos ();
4721 if (m == MATCH_ERROR)
4724 new_st.op = EXEC_SELECT_TYPE;
4725 new_st.ext.case_list = c;
4727 /* Create temporary variable. */
4728 select_type_set_tmp (&c->ts);
4733 gfc_error ("Syntax error in TYPE IS specification at %C");
4737 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4742 /* Match a CLASS IS or CLASS DEFAULT statement. */
4745 gfc_match_class_is (void)
4750 if (gfc_current_state () != COMP_SELECT_TYPE)
4753 if (gfc_match ("% default") == MATCH_YES)
4755 m = match_case_eos ();
4758 if (m == MATCH_ERROR)
4761 new_st.op = EXEC_SELECT_TYPE;
4762 c = gfc_get_case ();
4763 c->where = gfc_current_locus;
4764 c->ts.type = BT_UNKNOWN;
4765 new_st.ext.case_list = c;
4766 select_type_set_tmp (NULL);
4770 m = gfc_match ("% is");
4773 if (m == MATCH_ERROR)
4776 if (gfc_match_char ('(') != MATCH_YES)
4779 c = gfc_get_case ();
4780 c->where = gfc_current_locus;
4782 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4785 if (c->ts.type == BT_DERIVED)
4786 c->ts.type = BT_CLASS;
4788 if (gfc_match_char (')') != MATCH_YES)
4791 m = match_case_eos ();
4794 if (m == MATCH_ERROR)
4797 new_st.op = EXEC_SELECT_TYPE;
4798 new_st.ext.case_list = c;
4800 /* Create temporary variable. */
4801 select_type_set_tmp (&c->ts);
4806 gfc_error ("Syntax error in CLASS IS specification at %C");
4810 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4815 /********************* WHERE subroutines ********************/
4817 /* Match the rest of a simple WHERE statement that follows an IF statement.
4821 match_simple_where (void)
4827 m = gfc_match (" ( %e )", &expr);
4831 m = gfc_match_assignment ();
4834 if (m == MATCH_ERROR)
4837 if (gfc_match_eos () != MATCH_YES)
4840 c = gfc_get_code ();
4844 c->next = gfc_get_code ();
4847 gfc_clear_new_st ();
4849 new_st.op = EXEC_WHERE;
4855 gfc_syntax_error (ST_WHERE);
4858 gfc_free_expr (expr);
4863 /* Match a WHERE statement. */
4866 gfc_match_where (gfc_statement *st)
4872 m0 = gfc_match_label ();
4873 if (m0 == MATCH_ERROR)
4876 m = gfc_match (" where ( %e )", &expr);
4880 if (gfc_match_eos () == MATCH_YES)
4882 *st = ST_WHERE_BLOCK;
4883 new_st.op = EXEC_WHERE;
4884 new_st.expr1 = expr;
4888 m = gfc_match_assignment ();
4890 gfc_syntax_error (ST_WHERE);
4894 gfc_free_expr (expr);
4898 /* We've got a simple WHERE statement. */
4900 c = gfc_get_code ();
4904 c->next = gfc_get_code ();
4907 gfc_clear_new_st ();
4909 new_st.op = EXEC_WHERE;
4916 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4917 new_st if successful. */
4920 gfc_match_elsewhere (void)
4922 char name[GFC_MAX_SYMBOL_LEN + 1];
4926 if (gfc_current_state () != COMP_WHERE)
4928 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4934 if (gfc_match_char ('(') == MATCH_YES)
4936 m = gfc_match_expr (&expr);
4939 if (m == MATCH_ERROR)
4942 if (gfc_match_char (')') != MATCH_YES)
4946 if (gfc_match_eos () != MATCH_YES)
4948 /* Only makes sense if we have a where-construct-name. */
4949 if (!gfc_current_block ())
4954 /* Better be a name at this point. */
4955 m = gfc_match_name (name);
4958 if (m == MATCH_ERROR)
4961 if (gfc_match_eos () != MATCH_YES)
4964 if (strcmp (name, gfc_current_block ()->name) != 0)
4966 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4967 name, gfc_current_block ()->name);
4972 new_st.op = EXEC_WHERE;
4973 new_st.expr1 = expr;
4977 gfc_syntax_error (ST_ELSEWHERE);
4980 gfc_free_expr (expr);
4985 /******************** FORALL subroutines ********************/
4987 /* Free a list of FORALL iterators. */
4990 gfc_free_forall_iterator (gfc_forall_iterator *iter)
4992 gfc_forall_iterator *next;
4997 gfc_free_expr (iter->var);
4998 gfc_free_expr (iter->start);
4999 gfc_free_expr (iter->end);
5000 gfc_free_expr (iter->stride);
5007 /* Match an iterator as part of a FORALL statement. The format is:
5009 <var> = <start>:<end>[:<stride>]
5011 On MATCH_NO, the caller tests for the possibility that there is a
5012 scalar mask expression. */
5015 match_forall_iterator (gfc_forall_iterator **result)
5017 gfc_forall_iterator *iter;
5021 where = gfc_current_locus;
5022 iter = XCNEW (gfc_forall_iterator);
5024 m = gfc_match_expr (&iter->var);
5028 if (gfc_match_char ('=') != MATCH_YES
5029 || iter->var->expr_type != EXPR_VARIABLE)
5035 m = gfc_match_expr (&iter->start);
5039 if (gfc_match_char (':') != MATCH_YES)
5042 m = gfc_match_expr (&iter->end);
5045 if (m == MATCH_ERROR)
5048 if (gfc_match_char (':') == MATCH_NO)
5049 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
5052 m = gfc_match_expr (&iter->stride);
5055 if (m == MATCH_ERROR)
5059 /* Mark the iteration variable's symbol as used as a FORALL index. */
5060 iter->var->symtree->n.sym->forall_index = true;
5066 gfc_error ("Syntax error in FORALL iterator at %C");
5071 gfc_current_locus = where;
5072 gfc_free_forall_iterator (iter);
5077 /* Match the header of a FORALL statement. */
5080 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
5082 gfc_forall_iterator *head, *tail, *new_iter;
5086 gfc_gobble_whitespace ();
5091 if (gfc_match_char ('(') != MATCH_YES)
5094 m = match_forall_iterator (&new_iter);
5095 if (m == MATCH_ERROR)
5100 head = tail = new_iter;
5104 if (gfc_match_char (',') != MATCH_YES)
5107 m = match_forall_iterator (&new_iter);
5108 if (m == MATCH_ERROR)
5113 tail->next = new_iter;
5118 /* Have to have a mask expression. */
5120 m = gfc_match_expr (&msk);
5123 if (m == MATCH_ERROR)
5129 if (gfc_match_char (')') == MATCH_NO)
5137 gfc_syntax_error (ST_FORALL);
5140 gfc_free_expr (msk);
5141 gfc_free_forall_iterator (head);
5146 /* Match the rest of a simple FORALL statement that follows an
5150 match_simple_forall (void)
5152 gfc_forall_iterator *head;
5161 m = match_forall_header (&head, &mask);
5168 m = gfc_match_assignment ();
5170 if (m == MATCH_ERROR)
5174 m = gfc_match_pointer_assignment ();
5175 if (m == MATCH_ERROR)
5181 c = gfc_get_code ();
5183 c->loc = gfc_current_locus;
5185 if (gfc_match_eos () != MATCH_YES)
5188 gfc_clear_new_st ();
5189 new_st.op = EXEC_FORALL;
5190 new_st.expr1 = mask;
5191 new_st.ext.forall_iterator = head;
5192 new_st.block = gfc_get_code ();
5194 new_st.block->op = EXEC_FORALL;
5195 new_st.block->next = c;
5200 gfc_syntax_error (ST_FORALL);
5203 gfc_free_forall_iterator (head);
5204 gfc_free_expr (mask);
5210 /* Match a FORALL statement. */
5213 gfc_match_forall (gfc_statement *st)
5215 gfc_forall_iterator *head;
5224 m0 = gfc_match_label ();
5225 if (m0 == MATCH_ERROR)
5228 m = gfc_match (" forall");
5232 m = match_forall_header (&head, &mask);
5233 if (m == MATCH_ERROR)
5238 if (gfc_match_eos () == MATCH_YES)
5240 *st = ST_FORALL_BLOCK;
5241 new_st.op = EXEC_FORALL;
5242 new_st.expr1 = mask;
5243 new_st.ext.forall_iterator = head;
5247 m = gfc_match_assignment ();
5248 if (m == MATCH_ERROR)
5252 m = gfc_match_pointer_assignment ();
5253 if (m == MATCH_ERROR)
5259 c = gfc_get_code ();
5261 c->loc = gfc_current_locus;
5263 gfc_clear_new_st ();
5264 new_st.op = EXEC_FORALL;
5265 new_st.expr1 = mask;
5266 new_st.ext.forall_iterator = head;
5267 new_st.block = gfc_get_code ();
5268 new_st.block->op = EXEC_FORALL;
5269 new_st.block->next = c;
5275 gfc_syntax_error (ST_FORALL);
5278 gfc_free_forall_iterator (head);
5279 gfc_free_expr (mask);
5280 gfc_free_statements (c);