1 /* Matching subroutines in all sizes, shapes and colors.
2 Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
4 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_implicit_pure (NULL))
1750 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1752 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CRITICAL statement at %C")
1756 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
1758 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
1762 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
1764 gfc_error ("Nested CRITICAL block at %C");
1768 new_st.op = EXEC_CRITICAL;
1771 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1778 /* Match a BLOCK statement. */
1781 gfc_match_block (void)
1785 if (gfc_match_label () == MATCH_ERROR)
1788 if (gfc_match (" block") != MATCH_YES)
1791 /* For this to be a correct BLOCK statement, the line must end now. */
1792 m = gfc_match_eos ();
1793 if (m == MATCH_ERROR)
1802 /* Match an ASSOCIATE statement. */
1805 gfc_match_associate (void)
1807 if (gfc_match_label () == MATCH_ERROR)
1810 if (gfc_match (" associate") != MATCH_YES)
1813 /* Match the association list. */
1814 if (gfc_match_char ('(') != MATCH_YES)
1816 gfc_error ("Expected association list at %C");
1819 new_st.ext.block.assoc = NULL;
1822 gfc_association_list* newAssoc = gfc_get_association_list ();
1823 gfc_association_list* a;
1825 /* Match the next association. */
1826 if (gfc_match (" %n => %e", newAssoc->name, &newAssoc->target)
1829 gfc_error ("Expected association at %C");
1830 goto assocListError;
1832 newAssoc->where = gfc_current_locus;
1834 /* Check that the current name is not yet in the list. */
1835 for (a = new_st.ext.block.assoc; a; a = a->next)
1836 if (!strcmp (a->name, newAssoc->name))
1838 gfc_error ("Duplicate name '%s' in association at %C",
1840 goto assocListError;
1843 /* The target expression must not be coindexed. */
1844 if (gfc_is_coindexed (newAssoc->target))
1846 gfc_error ("Association target at %C must not be coindexed");
1847 goto assocListError;
1850 /* The `variable' field is left blank for now; because the target is not
1851 yet resolved, we can't use gfc_has_vector_subscript to determine it
1852 for now. This is set during resolution. */
1854 /* Put it into the list. */
1855 newAssoc->next = new_st.ext.block.assoc;
1856 new_st.ext.block.assoc = newAssoc;
1858 /* Try next one or end if closing parenthesis is found. */
1859 gfc_gobble_whitespace ();
1860 if (gfc_peek_char () == ')')
1862 if (gfc_match_char (',') != MATCH_YES)
1864 gfc_error ("Expected ')' or ',' at %C");
1874 if (gfc_match_char (')') != MATCH_YES)
1876 /* This should never happen as we peek above. */
1880 if (gfc_match_eos () != MATCH_YES)
1882 gfc_error ("Junk after ASSOCIATE statement at %C");
1889 gfc_free_association_list (new_st.ext.block.assoc);
1894 /* Match a DO statement. */
1899 gfc_iterator iter, *ip;
1901 gfc_st_label *label;
1904 old_loc = gfc_current_locus;
1907 iter.var = iter.start = iter.end = iter.step = NULL;
1909 m = gfc_match_label ();
1910 if (m == MATCH_ERROR)
1913 if (gfc_match (" do") != MATCH_YES)
1916 m = gfc_match_st_label (&label);
1917 if (m == MATCH_ERROR)
1920 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1922 if (gfc_match_eos () == MATCH_YES)
1924 iter.end = gfc_get_logical_expr (gfc_default_logical_kind, NULL, true);
1925 new_st.op = EXEC_DO_WHILE;
1929 /* Match an optional comma, if no comma is found, a space is obligatory. */
1930 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1933 /* Check for balanced parens. */
1935 if (gfc_match_parens () == MATCH_ERROR)
1938 /* See if we have a DO WHILE. */
1939 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1941 new_st.op = EXEC_DO_WHILE;
1945 /* The abortive DO WHILE may have done something to the symbol
1946 table, so we start over. */
1947 gfc_undo_symbols ();
1948 gfc_current_locus = old_loc;
1950 gfc_match_label (); /* This won't error. */
1951 gfc_match (" do "); /* This will work. */
1953 gfc_match_st_label (&label); /* Can't error out. */
1954 gfc_match_char (','); /* Optional comma. */
1956 m = gfc_match_iterator (&iter, 0);
1959 if (m == MATCH_ERROR)
1962 iter.var->symtree->n.sym->attr.implied_index = 0;
1963 gfc_check_do_variable (iter.var->symtree);
1965 if (gfc_match_eos () != MATCH_YES)
1967 gfc_syntax_error (ST_DO);
1971 new_st.op = EXEC_DO;
1975 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1978 new_st.label1 = label;
1980 if (new_st.op == EXEC_DO_WHILE)
1981 new_st.expr1 = iter.end;
1984 new_st.ext.iterator = ip = gfc_get_iterator ();
1991 gfc_free_iterator (&iter, 0);
1997 /* Match an EXIT or CYCLE statement. */
2000 match_exit_cycle (gfc_statement st, gfc_exec_op op)
2002 gfc_state_data *p, *o;
2007 if (gfc_match_eos () == MATCH_YES)
2011 char name[GFC_MAX_SYMBOL_LEN + 1];
2014 m = gfc_match ("% %n%t", name);
2015 if (m == MATCH_ERROR)
2019 gfc_syntax_error (st);
2023 /* Find the corresponding symbol. If there's a BLOCK statement
2024 between here and the label, it is not in gfc_current_ns but a parent
2026 stree = gfc_find_symtree_in_proc (name, gfc_current_ns);
2029 gfc_error ("Name '%s' in %s statement at %C is unknown",
2030 name, gfc_ascii_statement (st));
2035 if (sym->attr.flavor != FL_LABEL)
2037 gfc_error ("Name '%s' in %s statement at %C is not a construct name",
2038 name, gfc_ascii_statement (st));
2043 /* Find the loop specified by the label (or lack of a label). */
2044 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
2045 if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
2047 else if (p->state == COMP_CRITICAL)
2049 gfc_error("%s statement at %C leaves CRITICAL construct",
2050 gfc_ascii_statement (st));
2053 else if ((sym && sym == p->sym) || (!sym && p->state == COMP_DO))
2059 gfc_error ("%s statement at %C is not within a construct",
2060 gfc_ascii_statement (st));
2062 gfc_error ("%s statement at %C is not within construct '%s'",
2063 gfc_ascii_statement (st), sym->name);
2068 /* Special checks for EXIT from non-loop constructs. */
2075 /* This is already handled above. */
2078 case COMP_ASSOCIATE:
2082 case COMP_SELECT_TYPE:
2084 if (op == EXEC_CYCLE)
2086 gfc_error ("CYCLE statement at %C is not applicable to non-loop"
2087 " construct '%s'", sym->name);
2090 gcc_assert (op == EXEC_EXIT);
2091 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: EXIT statement with no"
2092 " do-construct-name at %C") == FAILURE)
2097 gfc_error ("%s statement at %C is not applicable to construct '%s'",
2098 gfc_ascii_statement (st), sym->name);
2104 gfc_error ("%s statement at %C leaving OpenMP structured block",
2105 gfc_ascii_statement (st));
2109 for (o = p, cnt = 0; o->state == COMP_DO && o->previous != NULL; cnt++)
2113 && o->state == COMP_OMP_STRUCTURED_BLOCK
2114 && (o->head->op == EXEC_OMP_DO
2115 || o->head->op == EXEC_OMP_PARALLEL_DO))
2118 gcc_assert (o->head->next != NULL
2119 && (o->head->next->op == EXEC_DO
2120 || o->head->next->op == EXEC_DO_WHILE)
2121 && o->previous != NULL
2122 && o->previous->tail->op == o->head->op);
2123 if (o->previous->tail->ext.omp_clauses != NULL
2124 && o->previous->tail->ext.omp_clauses->collapse > 1)
2125 collapse = o->previous->tail->ext.omp_clauses->collapse;
2126 if (st == ST_EXIT && cnt <= collapse)
2128 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
2131 if (st == ST_CYCLE && cnt < collapse)
2133 gfc_error ("CYCLE statement at %C to non-innermost collapsed"
2139 /* Save the first statement in the construct - needed by the backend. */
2140 new_st.ext.which_construct = p->construct;
2148 /* Match the EXIT statement. */
2151 gfc_match_exit (void)
2153 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
2157 /* Match the CYCLE statement. */
2160 gfc_match_cycle (void)
2162 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
2166 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
2169 gfc_match_stopcode (gfc_statement st)
2176 if (gfc_match_eos () != MATCH_YES)
2178 m = gfc_match_init_expr (&e);
2179 if (m == MATCH_ERROR)
2184 if (gfc_match_eos () != MATCH_YES)
2188 if (gfc_pure (NULL))
2190 gfc_error ("%s statement not allowed in PURE procedure at %C",
2191 gfc_ascii_statement (st));
2195 if (gfc_implicit_pure (NULL))
2196 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2198 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2200 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2206 if (!(e->ts.type == BT_CHARACTER || e->ts.type == BT_INTEGER))
2208 gfc_error ("STOP code at %L must be either INTEGER or CHARACTER type",
2215 gfc_error ("STOP code at %L must be scalar",
2220 if (e->ts.type == BT_CHARACTER
2221 && e->ts.kind != gfc_default_character_kind)
2223 gfc_error ("STOP code at %L must be default character KIND=%d",
2224 &e->where, (int) gfc_default_character_kind);
2228 if (e->ts.type == BT_INTEGER
2229 && e->ts.kind != gfc_default_integer_kind)
2231 gfc_error ("STOP code at %L must be default integer KIND=%d",
2232 &e->where, (int) gfc_default_integer_kind);
2240 new_st.op = EXEC_STOP;
2243 new_st.op = EXEC_ERROR_STOP;
2246 new_st.op = EXEC_PAUSE;
2253 new_st.ext.stop_code = -1;
2258 gfc_syntax_error (st);
2267 /* Match the (deprecated) PAUSE statement. */
2270 gfc_match_pause (void)
2274 m = gfc_match_stopcode (ST_PAUSE);
2277 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2286 /* Match the STOP statement. */
2289 gfc_match_stop (void)
2291 return gfc_match_stopcode (ST_STOP);
2295 /* Match the ERROR STOP statement. */
2298 gfc_match_error_stop (void)
2300 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2304 return gfc_match_stopcode (ST_ERROR_STOP);
2308 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2309 SYNC ALL [(sync-stat-list)]
2310 SYNC MEMORY [(sync-stat-list)]
2311 SYNC IMAGES (image-set [, sync-stat-list] )
2312 with sync-stat is int-expr or *. */
2315 sync_statement (gfc_statement st)
2318 gfc_expr *tmp, *imageset, *stat, *errmsg;
2319 bool saw_stat, saw_errmsg;
2321 tmp = imageset = stat = errmsg = NULL;
2322 saw_stat = saw_errmsg = false;
2324 if (gfc_pure (NULL))
2326 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2330 if (gfc_implicit_pure (NULL))
2331 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2333 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2337 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2339 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2343 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2345 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2349 if (gfc_match_eos () == MATCH_YES)
2351 if (st == ST_SYNC_IMAGES)
2356 if (gfc_match_char ('(') != MATCH_YES)
2359 if (st == ST_SYNC_IMAGES)
2361 /* Denote '*' as imageset == NULL. */
2362 m = gfc_match_char ('*');
2363 if (m == MATCH_ERROR)
2367 if (gfc_match ("%e", &imageset) != MATCH_YES)
2370 m = gfc_match_char (',');
2371 if (m == MATCH_ERROR)
2375 m = gfc_match_char (')');
2384 m = gfc_match (" stat = %v", &tmp);
2385 if (m == MATCH_ERROR)
2391 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2397 if (gfc_match_char (',') == MATCH_YES)
2401 m = gfc_match (" errmsg = %v", &tmp);
2402 if (m == MATCH_ERROR)
2408 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2414 if (gfc_match_char (',') == MATCH_YES)
2418 gfc_gobble_whitespace ();
2420 if (gfc_peek_char () == ')')
2426 if (gfc_match (" )%t") != MATCH_YES)
2433 new_st.op = EXEC_SYNC_ALL;
2435 case ST_SYNC_IMAGES:
2436 new_st.op = EXEC_SYNC_IMAGES;
2438 case ST_SYNC_MEMORY:
2439 new_st.op = EXEC_SYNC_MEMORY;
2445 new_st.expr1 = imageset;
2446 new_st.expr2 = stat;
2447 new_st.expr3 = errmsg;
2452 gfc_syntax_error (st);
2455 gfc_free_expr (tmp);
2456 gfc_free_expr (imageset);
2457 gfc_free_expr (stat);
2458 gfc_free_expr (errmsg);
2464 /* Match SYNC ALL statement. */
2467 gfc_match_sync_all (void)
2469 return sync_statement (ST_SYNC_ALL);
2473 /* Match SYNC IMAGES statement. */
2476 gfc_match_sync_images (void)
2478 return sync_statement (ST_SYNC_IMAGES);
2482 /* Match SYNC MEMORY statement. */
2485 gfc_match_sync_memory (void)
2487 return sync_statement (ST_SYNC_MEMORY);
2491 /* Match a CONTINUE statement. */
2494 gfc_match_continue (void)
2496 if (gfc_match_eos () != MATCH_YES)
2498 gfc_syntax_error (ST_CONTINUE);
2502 new_st.op = EXEC_CONTINUE;
2507 /* Match the (deprecated) ASSIGN statement. */
2510 gfc_match_assign (void)
2513 gfc_st_label *label;
2515 if (gfc_match (" %l", &label) == MATCH_YES)
2517 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2519 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2521 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2526 expr->symtree->n.sym->attr.assign = 1;
2528 new_st.op = EXEC_LABEL_ASSIGN;
2529 new_st.label1 = label;
2530 new_st.expr1 = expr;
2538 /* Match the GO TO statement. As a computed GOTO statement is
2539 matched, it is transformed into an equivalent SELECT block. No
2540 tree is necessary, and the resulting jumps-to-jumps are
2541 specifically optimized away by the back end. */
2544 gfc_match_goto (void)
2546 gfc_code *head, *tail;
2549 gfc_st_label *label;
2553 if (gfc_match (" %l%t", &label) == MATCH_YES)
2555 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2558 new_st.op = EXEC_GOTO;
2559 new_st.label1 = label;
2563 /* The assigned GO TO statement. */
2565 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2567 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2572 new_st.op = EXEC_GOTO;
2573 new_st.expr1 = expr;
2575 if (gfc_match_eos () == MATCH_YES)
2578 /* Match label list. */
2579 gfc_match_char (',');
2580 if (gfc_match_char ('(') != MATCH_YES)
2582 gfc_syntax_error (ST_GOTO);
2589 m = gfc_match_st_label (&label);
2593 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2597 head = tail = gfc_get_code ();
2600 tail->block = gfc_get_code ();
2604 tail->label1 = label;
2605 tail->op = EXEC_GOTO;
2607 while (gfc_match_char (',') == MATCH_YES);
2609 if (gfc_match (")%t") != MATCH_YES)
2614 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2617 new_st.block = head;
2622 /* Last chance is a computed GO TO statement. */
2623 if (gfc_match_char ('(') != MATCH_YES)
2625 gfc_syntax_error (ST_GOTO);
2634 m = gfc_match_st_label (&label);
2638 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2642 head = tail = gfc_get_code ();
2645 tail->block = gfc_get_code ();
2649 cp = gfc_get_case ();
2650 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2653 tail->op = EXEC_SELECT;
2654 tail->ext.block.case_list = cp;
2656 tail->next = gfc_get_code ();
2657 tail->next->op = EXEC_GOTO;
2658 tail->next->label1 = label;
2660 while (gfc_match_char (',') == MATCH_YES);
2662 if (gfc_match_char (')') != MATCH_YES)
2667 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2671 /* Get the rest of the statement. */
2672 gfc_match_char (',');
2674 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2677 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2678 "at %C") == FAILURE)
2681 /* At this point, a computed GOTO has been fully matched and an
2682 equivalent SELECT statement constructed. */
2684 new_st.op = EXEC_SELECT;
2685 new_st.expr1 = NULL;
2687 /* Hack: For a "real" SELECT, the expression is in expr. We put
2688 it in expr2 so we can distinguish then and produce the correct
2690 new_st.expr2 = expr;
2691 new_st.block = head;
2695 gfc_syntax_error (ST_GOTO);
2697 gfc_free_statements (head);
2702 /* Frees a list of gfc_alloc structures. */
2705 gfc_free_alloc_list (gfc_alloc *p)
2712 gfc_free_expr (p->expr);
2718 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2719 an accessible derived type. */
2722 match_derived_type_spec (gfc_typespec *ts)
2724 char name[GFC_MAX_SYMBOL_LEN + 1];
2726 gfc_symbol *derived;
2728 old_locus = gfc_current_locus;
2730 if (gfc_match ("%n", name) != MATCH_YES)
2732 gfc_current_locus = old_locus;
2736 gfc_find_symbol (name, NULL, 1, &derived);
2738 if (derived && derived->attr.flavor == FL_DERIVED)
2740 ts->type = BT_DERIVED;
2741 ts->u.derived = derived;
2745 gfc_current_locus = old_locus;
2750 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2751 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2752 It only includes the intrinsic types from the Fortran 2003 standard
2753 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2754 the implicit_flag is not needed, so it was removed. Derived types are
2755 identified by their name alone. */
2758 match_type_spec (gfc_typespec *ts)
2764 gfc_gobble_whitespace ();
2765 old_locus = gfc_current_locus;
2767 if (match_derived_type_spec (ts) == MATCH_YES)
2769 /* Enforce F03:C401. */
2770 if (ts->u.derived->attr.abstract)
2772 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2773 ts->u.derived->name, &old_locus);
2779 if (gfc_match ("integer") == MATCH_YES)
2781 ts->type = BT_INTEGER;
2782 ts->kind = gfc_default_integer_kind;
2786 if (gfc_match ("real") == MATCH_YES)
2789 ts->kind = gfc_default_real_kind;
2793 if (gfc_match ("double precision") == MATCH_YES)
2796 ts->kind = gfc_default_double_kind;
2800 if (gfc_match ("complex") == MATCH_YES)
2802 ts->type = BT_COMPLEX;
2803 ts->kind = gfc_default_complex_kind;
2807 if (gfc_match ("character") == MATCH_YES)
2809 ts->type = BT_CHARACTER;
2811 m = gfc_match_char_spec (ts);
2819 if (gfc_match ("logical") == MATCH_YES)
2821 ts->type = BT_LOGICAL;
2822 ts->kind = gfc_default_logical_kind;
2826 /* If a type is not matched, simply return MATCH_NO. */
2827 gfc_current_locus = old_locus;
2832 gfc_gobble_whitespace ();
2833 if (gfc_peek_ascii_char () == '*')
2835 gfc_error ("Invalid type-spec at %C");
2839 m = gfc_match_kind_spec (ts, false);
2842 m = MATCH_YES; /* No kind specifier found. */
2848 /* Match an ALLOCATE statement. */
2851 gfc_match_allocate (void)
2853 gfc_alloc *head, *tail;
2854 gfc_expr *stat, *errmsg, *tmp, *source, *mold;
2858 locus old_locus, deferred_locus;
2859 bool saw_stat, saw_errmsg, saw_source, saw_mold, saw_deferred, b1, b2, b3;
2862 stat = errmsg = source = mold = tmp = NULL;
2863 saw_stat = saw_errmsg = saw_source = saw_mold = saw_deferred = false;
2865 if (gfc_match_char ('(') != MATCH_YES)
2868 /* Match an optional type-spec. */
2869 old_locus = gfc_current_locus;
2870 m = match_type_spec (&ts);
2871 if (m == MATCH_ERROR)
2873 else if (m == MATCH_NO)
2875 char name[GFC_MAX_SYMBOL_LEN + 3];
2877 if (gfc_match ("%n :: ", name) == MATCH_YES)
2879 gfc_error ("Error in type-spec at %L", &old_locus);
2883 ts.type = BT_UNKNOWN;
2887 if (gfc_match (" :: ") == MATCH_YES)
2889 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
2890 "ALLOCATE at %L", &old_locus) == FAILURE)
2895 gfc_error ("Type-spec at %L cannot contain a deferred "
2896 "type parameter", &old_locus);
2902 ts.type = BT_UNKNOWN;
2903 gfc_current_locus = old_locus;
2910 head = tail = gfc_get_alloc ();
2913 tail->next = gfc_get_alloc ();
2917 m = gfc_match_variable (&tail->expr, 0);
2920 if (m == MATCH_ERROR)
2923 if (gfc_check_do_variable (tail->expr->symtree))
2926 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
2928 gfc_error ("Bad allocate-object at %C for a PURE procedure");
2932 if (gfc_implicit_pure (NULL)
2933 && gfc_impure_variable (tail->expr->symtree->n.sym))
2934 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2936 if (tail->expr->ts.deferred)
2938 saw_deferred = true;
2939 deferred_locus = tail->expr->where;
2942 /* The ALLOCATE statement had an optional typespec. Check the
2944 if (ts.type != BT_UNKNOWN)
2946 /* Enforce F03:C624. */
2947 if (!gfc_type_compatible (&tail->expr->ts, &ts))
2949 gfc_error ("Type of entity at %L is type incompatible with "
2950 "typespec", &tail->expr->where);
2954 /* Enforce F03:C627. */
2955 if (ts.kind != tail->expr->ts.kind)
2957 gfc_error ("Kind type parameter for entity at %L differs from "
2958 "the kind type parameter of the typespec",
2959 &tail->expr->where);
2964 if (tail->expr->ts.type == BT_DERIVED)
2965 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
2967 /* FIXME: disable the checking on derived types and arrays. */
2968 sym = tail->expr->symtree->n.sym;
2969 b1 = !(tail->expr->ref
2970 && (tail->expr->ref->type == REF_COMPONENT
2971 || tail->expr->ref->type == REF_ARRAY));
2972 if (sym && sym->ts.type == BT_CLASS && sym->attr.class_ok)
2973 b2 = !(CLASS_DATA (sym)->attr.allocatable
2974 || CLASS_DATA (sym)->attr.class_pointer);
2976 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
2977 || sym->attr.proc_pointer);
2978 b3 = sym && sym->ns && sym->ns->proc_name
2979 && (sym->ns->proc_name->attr.allocatable
2980 || sym->ns->proc_name->attr.pointer
2981 || sym->ns->proc_name->attr.proc_pointer);
2982 if (b1 && b2 && !b3)
2984 gfc_error ("Allocate-object at %L is not a nonprocedure pointer "
2985 "or an allocatable variable", &tail->expr->where);
2989 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
2991 gfc_error ("Shape specification for allocatable scalar at %C");
2995 if (gfc_match_char (',') != MATCH_YES)
3000 m = gfc_match (" stat = %v", &tmp);
3001 if (m == MATCH_ERROR)
3008 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3016 if (gfc_check_do_variable (stat->symtree))
3019 if (gfc_match_char (',') == MATCH_YES)
3020 goto alloc_opt_list;
3023 m = gfc_match (" errmsg = %v", &tmp);
3024 if (m == MATCH_ERROR)
3028 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
3029 &tmp->where) == FAILURE)
3035 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3043 if (gfc_match_char (',') == MATCH_YES)
3044 goto alloc_opt_list;
3047 m = gfc_match (" source = %e", &tmp);
3048 if (m == MATCH_ERROR)
3052 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
3053 &tmp->where) == FAILURE)
3059 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
3063 /* The next 2 conditionals check C631. */
3064 if (ts.type != BT_UNKNOWN)
3066 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
3067 &tmp->where, &old_locus);
3073 gfc_error ("SOURCE tag at %L requires only a single entity in "
3074 "the allocation-list", &tmp->where);
3082 if (gfc_match_char (',') == MATCH_YES)
3083 goto alloc_opt_list;
3086 m = gfc_match (" mold = %e", &tmp);
3087 if (m == MATCH_ERROR)
3091 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: MOLD tag at %L",
3092 &tmp->where) == FAILURE)
3095 /* Check F08:C636. */
3098 gfc_error ("Redundant MOLD tag found at %L ", &tmp->where);
3102 /* Check F08:C637. */
3103 if (ts.type != BT_UNKNOWN)
3105 gfc_error ("MOLD tag at %L conflicts with the typespec at %L",
3106 &tmp->where, &old_locus);
3115 if (gfc_match_char (',') == MATCH_YES)
3116 goto alloc_opt_list;
3119 gfc_gobble_whitespace ();
3121 if (gfc_peek_char () == ')')
3125 if (gfc_match (" )%t") != MATCH_YES)
3128 /* Check F08:C637. */
3131 gfc_error ("MOLD tag at %L conflicts with SOURCE tag at %L",
3132 &mold->where, &source->where);
3136 /* Check F03:C623, */
3137 if (saw_deferred && ts.type == BT_UNKNOWN && !source && !mold)
3139 gfc_error ("Allocate-object at %L with a deferred type parameter "
3140 "requires either a type-spec or SOURCE tag or a MOLD tag",
3145 new_st.op = EXEC_ALLOCATE;
3146 new_st.expr1 = stat;
3147 new_st.expr2 = errmsg;
3149 new_st.expr3 = source;
3151 new_st.expr3 = mold;
3152 new_st.ext.alloc.list = head;
3153 new_st.ext.alloc.ts = ts;
3158 gfc_syntax_error (ST_ALLOCATE);
3161 gfc_free_expr (errmsg);
3162 gfc_free_expr (source);
3163 gfc_free_expr (stat);
3164 gfc_free_expr (mold);
3165 if (tmp && tmp->expr_type) gfc_free_expr (tmp);
3166 gfc_free_alloc_list (head);
3171 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
3172 a set of pointer assignments to intrinsic NULL(). */
3175 gfc_match_nullify (void)
3183 if (gfc_match_char ('(') != MATCH_YES)
3188 m = gfc_match_variable (&p, 0);
3189 if (m == MATCH_ERROR)
3194 if (gfc_check_do_variable (p->symtree))
3198 if (gfc_is_coindexed (p))
3200 gfc_error ("Pointer object at %C shall not be conindexed");
3204 /* build ' => NULL() '. */
3205 e = gfc_get_null_expr (&gfc_current_locus);
3207 /* Chain to list. */
3212 tail->next = gfc_get_code ();
3216 tail->op = EXEC_POINTER_ASSIGN;
3220 if (gfc_match (" )%t") == MATCH_YES)
3222 if (gfc_match_char (',') != MATCH_YES)
3229 gfc_syntax_error (ST_NULLIFY);
3232 gfc_free_statements (new_st.next);
3234 gfc_free_expr (new_st.expr1);
3235 new_st.expr1 = NULL;
3236 gfc_free_expr (new_st.expr2);
3237 new_st.expr2 = NULL;
3242 /* Match a DEALLOCATE statement. */
3245 gfc_match_deallocate (void)
3247 gfc_alloc *head, *tail;
3248 gfc_expr *stat, *errmsg, *tmp;
3251 bool saw_stat, saw_errmsg, b1, b2;
3254 stat = errmsg = tmp = NULL;
3255 saw_stat = saw_errmsg = false;
3257 if (gfc_match_char ('(') != MATCH_YES)
3263 head = tail = gfc_get_alloc ();
3266 tail->next = gfc_get_alloc ();
3270 m = gfc_match_variable (&tail->expr, 0);
3271 if (m == MATCH_ERROR)
3276 if (gfc_check_do_variable (tail->expr->symtree))
3279 sym = tail->expr->symtree->n.sym;
3281 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3283 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3287 if (gfc_implicit_pure (NULL) && gfc_impure_variable (sym))
3288 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3290 /* FIXME: disable the checking on derived types. */
3291 b1 = !(tail->expr->ref
3292 && (tail->expr->ref->type == REF_COMPONENT
3293 || tail->expr->ref->type == REF_ARRAY));
3294 if (sym && sym->ts.type == BT_CLASS)
3295 b2 = !(CLASS_DATA (sym)->attr.allocatable
3296 || CLASS_DATA (sym)->attr.class_pointer);
3298 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3299 || sym->attr.proc_pointer);
3302 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3303 "or an allocatable variable");
3307 if (gfc_match_char (',') != MATCH_YES)
3312 m = gfc_match (" stat = %v", &tmp);
3313 if (m == MATCH_ERROR)
3319 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3320 gfc_free_expr (tmp);
3327 if (gfc_check_do_variable (stat->symtree))
3330 if (gfc_match_char (',') == MATCH_YES)
3331 goto dealloc_opt_list;
3334 m = gfc_match (" errmsg = %v", &tmp);
3335 if (m == MATCH_ERROR)
3339 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3340 &tmp->where) == FAILURE)
3345 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3346 gfc_free_expr (tmp);
3353 if (gfc_match_char (',') == MATCH_YES)
3354 goto dealloc_opt_list;
3357 gfc_gobble_whitespace ();
3359 if (gfc_peek_char () == ')')
3363 if (gfc_match (" )%t") != MATCH_YES)
3366 new_st.op = EXEC_DEALLOCATE;
3367 new_st.expr1 = stat;
3368 new_st.expr2 = errmsg;
3369 new_st.ext.alloc.list = head;
3374 gfc_syntax_error (ST_DEALLOCATE);
3377 gfc_free_expr (errmsg);
3378 gfc_free_expr (stat);
3379 gfc_free_alloc_list (head);
3384 /* Match a RETURN statement. */
3387 gfc_match_return (void)
3391 gfc_compile_state s;
3395 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3397 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3401 if (gfc_match_eos () == MATCH_YES)
3404 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3406 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3411 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3412 "at %C") == FAILURE)
3415 if (gfc_current_form == FORM_FREE)
3417 /* The following are valid, so we can't require a blank after the
3421 char c = gfc_peek_ascii_char ();
3422 if (ISALPHA (c) || ISDIGIT (c))
3426 m = gfc_match (" %e%t", &e);
3429 if (m == MATCH_ERROR)
3432 gfc_syntax_error (ST_RETURN);
3439 gfc_enclosing_unit (&s);
3440 if (s == COMP_PROGRAM
3441 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3442 "main program at %C") == FAILURE)
3445 new_st.op = EXEC_RETURN;
3452 /* Match the call of a type-bound procedure, if CALL%var has already been
3453 matched and var found to be a derived-type variable. */
3456 match_typebound_call (gfc_symtree* varst)
3461 base = gfc_get_expr ();
3462 base->expr_type = EXPR_VARIABLE;
3463 base->symtree = varst;
3464 base->where = gfc_current_locus;
3465 gfc_set_sym_referenced (varst->n.sym);
3467 m = gfc_match_varspec (base, 0, true, true);
3469 gfc_error ("Expected component reference at %C");
3473 if (gfc_match_eos () != MATCH_YES)
3475 gfc_error ("Junk after CALL at %C");
3479 if (base->expr_type == EXPR_COMPCALL)
3480 new_st.op = EXEC_COMPCALL;
3481 else if (base->expr_type == EXPR_PPC)
3482 new_st.op = EXEC_CALL_PPC;
3485 gfc_error ("Expected type-bound procedure or procedure pointer component "
3489 new_st.expr1 = base;
3495 /* Match a CALL statement. The tricky part here are possible
3496 alternate return specifiers. We handle these by having all
3497 "subroutines" actually return an integer via a register that gives
3498 the return number. If the call specifies alternate returns, we
3499 generate code for a SELECT statement whose case clauses contain
3500 GOTOs to the various labels. */
3503 gfc_match_call (void)
3505 char name[GFC_MAX_SYMBOL_LEN + 1];
3506 gfc_actual_arglist *a, *arglist;
3516 m = gfc_match ("% %n", name);
3522 if (gfc_get_ha_sym_tree (name, &st))
3527 /* If this is a variable of derived-type, it probably starts a type-bound
3529 if ((sym->attr.flavor != FL_PROCEDURE
3530 || gfc_is_function_return_value (sym, gfc_current_ns))
3531 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3532 return match_typebound_call (st);
3534 /* If it does not seem to be callable (include functions so that the
3535 right association is made. They are thrown out in resolution.)
3537 if (!sym->attr.generic
3538 && !sym->attr.subroutine
3539 && !sym->attr.function)
3541 if (!(sym->attr.external && !sym->attr.referenced))
3543 /* ...create a symbol in this scope... */
3544 if (sym->ns != gfc_current_ns
3545 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3548 if (sym != st->n.sym)
3552 /* ...and then to try to make the symbol into a subroutine. */
3553 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3557 gfc_set_sym_referenced (sym);
3559 if (gfc_match_eos () != MATCH_YES)
3561 m = gfc_match_actual_arglist (1, &arglist);
3564 if (m == MATCH_ERROR)
3567 if (gfc_match_eos () != MATCH_YES)
3571 /* If any alternate return labels were found, construct a SELECT
3572 statement that will jump to the right place. */
3575 for (a = arglist; a; a = a->next)
3576 if (a->expr == NULL)
3581 gfc_symtree *select_st;
3582 gfc_symbol *select_sym;
3583 char name[GFC_MAX_SYMBOL_LEN + 1];
3585 new_st.next = c = gfc_get_code ();
3586 c->op = EXEC_SELECT;
3587 sprintf (name, "_result_%s", sym->name);
3588 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3590 select_sym = select_st->n.sym;
3591 select_sym->ts.type = BT_INTEGER;
3592 select_sym->ts.kind = gfc_default_integer_kind;
3593 gfc_set_sym_referenced (select_sym);
3594 c->expr1 = gfc_get_expr ();
3595 c->expr1->expr_type = EXPR_VARIABLE;
3596 c->expr1->symtree = select_st;
3597 c->expr1->ts = select_sym->ts;
3598 c->expr1->where = gfc_current_locus;
3601 for (a = arglist; a; a = a->next)
3603 if (a->expr != NULL)
3606 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3611 c->block = gfc_get_code ();
3613 c->op = EXEC_SELECT;
3615 new_case = gfc_get_case ();
3616 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3617 new_case->low = new_case->high;
3618 c->ext.block.case_list = new_case;
3620 c->next = gfc_get_code ();
3621 c->next->op = EXEC_GOTO;
3622 c->next->label1 = a->label;
3626 new_st.op = EXEC_CALL;
3627 new_st.symtree = st;
3628 new_st.ext.actual = arglist;
3633 gfc_syntax_error (ST_CALL);
3636 gfc_free_actual_arglist (arglist);
3641 /* Given a name, return a pointer to the common head structure,
3642 creating it if it does not exist. If FROM_MODULE is nonzero, we
3643 mangle the name so that it doesn't interfere with commons defined
3644 in the using namespace.
3645 TODO: Add to global symbol tree. */
3648 gfc_get_common (const char *name, int from_module)
3651 static int serial = 0;
3652 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3656 /* A use associated common block is only needed to correctly layout
3657 the variables it contains. */
3658 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3659 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3663 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3666 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3669 if (st->n.common == NULL)
3671 st->n.common = gfc_get_common_head ();
3672 st->n.common->where = gfc_current_locus;
3673 strcpy (st->n.common->name, name);
3676 return st->n.common;
3680 /* Match a common block name. */
3682 match match_common_name (char *name)
3686 if (gfc_match_char ('/') == MATCH_NO)
3692 if (gfc_match_char ('/') == MATCH_YES)
3698 m = gfc_match_name (name);
3700 if (m == MATCH_ERROR)
3702 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3705 gfc_error ("Syntax error in common block name at %C");
3710 /* Match a COMMON statement. */
3713 gfc_match_common (void)
3715 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3716 char name[GFC_MAX_SYMBOL_LEN + 1];
3723 old_blank_common = gfc_current_ns->blank_common.head;
3724 if (old_blank_common)
3726 while (old_blank_common->common_next)
3727 old_blank_common = old_blank_common->common_next;
3734 m = match_common_name (name);
3735 if (m == MATCH_ERROR)
3738 gsym = gfc_get_gsymbol (name);
3739 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3741 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3742 "is not COMMON", name);
3746 if (gsym->type == GSYM_UNKNOWN)
3748 gsym->type = GSYM_COMMON;
3749 gsym->where = gfc_current_locus;
3755 if (name[0] == '\0')
3757 t = &gfc_current_ns->blank_common;
3758 if (t->head == NULL)
3759 t->where = gfc_current_locus;
3763 t = gfc_get_common (name, 0);
3772 while (tail->common_next)
3773 tail = tail->common_next;
3776 /* Grab the list of symbols. */
3779 m = gfc_match_symbol (&sym, 0);
3780 if (m == MATCH_ERROR)
3785 /* Store a ref to the common block for error checking. */
3786 sym->common_block = t;
3788 /* See if we know the current common block is bind(c), and if
3789 so, then see if we can check if the symbol is (which it'll
3790 need to be). This can happen if the bind(c) attr stmt was
3791 applied to the common block, and the variable(s) already
3792 defined, before declaring the common block. */
3793 if (t->is_bind_c == 1)
3795 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3797 /* If we find an error, just print it and continue,
3798 cause it's just semantic, and we can see if there
3800 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3801 "at %C must be declared with a C "
3802 "interoperable kind since common block "
3804 sym->name, &(sym->declared_at), t->name,
3808 if (sym->attr.is_bind_c == 1)
3809 gfc_error_now ("Variable '%s' in common block "
3810 "'%s' at %C can not be bind(c) since "
3811 "it is not global", sym->name, t->name);
3814 if (sym->attr.in_common)
3816 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
3821 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
3822 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
3824 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
3825 "can only be COMMON in "
3826 "BLOCK DATA", sym->name)
3831 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
3835 tail->common_next = sym;
3841 /* Deal with an optional array specification after the
3843 m = gfc_match_array_spec (&as, true, true);
3844 if (m == MATCH_ERROR)
3849 if (as->type != AS_EXPLICIT)
3851 gfc_error ("Array specification for symbol '%s' in COMMON "
3852 "at %C must be explicit", sym->name);
3856 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
3859 if (sym->attr.pointer)
3861 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
3862 "POINTER array", sym->name);
3871 sym->common_head = t;
3873 /* Check to see if the symbol is already in an equivalence group.
3874 If it is, set the other members as being in common. */
3875 if (sym->attr.in_equivalence)
3877 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
3879 for (e2 = e1; e2; e2 = e2->eq)
3880 if (e2->expr->symtree->n.sym == sym)
3887 for (e2 = e1; e2; e2 = e2->eq)
3889 other = e2->expr->symtree->n.sym;
3890 if (other->common_head
3891 && other->common_head != sym->common_head)
3893 gfc_error ("Symbol '%s', in COMMON block '%s' at "
3894 "%C is being indirectly equivalenced to "
3895 "another COMMON block '%s'",
3896 sym->name, sym->common_head->name,
3897 other->common_head->name);
3900 other->attr.in_common = 1;
3901 other->common_head = t;
3907 gfc_gobble_whitespace ();
3908 if (gfc_match_eos () == MATCH_YES)
3910 if (gfc_peek_ascii_char () == '/')
3912 if (gfc_match_char (',') != MATCH_YES)
3914 gfc_gobble_whitespace ();
3915 if (gfc_peek_ascii_char () == '/')
3924 gfc_syntax_error (ST_COMMON);
3927 if (old_blank_common)
3928 old_blank_common->common_next = NULL;
3930 gfc_current_ns->blank_common.head = NULL;
3931 gfc_free_array_spec (as);
3936 /* Match a BLOCK DATA program unit. */
3939 gfc_match_block_data (void)
3941 char name[GFC_MAX_SYMBOL_LEN + 1];
3945 if (gfc_match_eos () == MATCH_YES)
3947 gfc_new_block = NULL;
3951 m = gfc_match ("% %n%t", name);
3955 if (gfc_get_symbol (name, NULL, &sym))
3958 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
3961 gfc_new_block = sym;
3967 /* Free a namelist structure. */
3970 gfc_free_namelist (gfc_namelist *name)
3974 for (; name; name = n)
3982 /* Match a NAMELIST statement. */
3985 gfc_match_namelist (void)
3987 gfc_symbol *group_name, *sym;
3991 m = gfc_match (" / %s /", &group_name);
3994 if (m == MATCH_ERROR)
3999 if (group_name->ts.type != BT_UNKNOWN)
4001 gfc_error ("Namelist group name '%s' at %C already has a basic "
4002 "type of %s", group_name->name,
4003 gfc_typename (&group_name->ts));
4007 if (group_name->attr.flavor == FL_NAMELIST
4008 && group_name->attr.use_assoc
4009 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
4010 "at %C already is USE associated and can"
4011 "not be respecified.", group_name->name)
4015 if (group_name->attr.flavor != FL_NAMELIST
4016 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
4017 group_name->name, NULL) == FAILURE)
4022 m = gfc_match_symbol (&sym, 1);
4025 if (m == MATCH_ERROR)
4028 if (sym->attr.in_namelist == 0
4029 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
4032 /* Use gfc_error_check here, rather than goto error, so that
4033 these are the only errors for the next two lines. */
4034 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
4036 gfc_error ("Assumed size array '%s' in namelist '%s' at "
4037 "%C is not allowed", sym->name, group_name->name);
4041 nl = gfc_get_namelist ();
4045 if (group_name->namelist == NULL)
4046 group_name->namelist = group_name->namelist_tail = nl;
4049 group_name->namelist_tail->next = nl;
4050 group_name->namelist_tail = nl;
4053 if (gfc_match_eos () == MATCH_YES)
4056 m = gfc_match_char (',');
4058 if (gfc_match_char ('/') == MATCH_YES)
4060 m2 = gfc_match (" %s /", &group_name);
4061 if (m2 == MATCH_YES)
4063 if (m2 == MATCH_ERROR)
4077 gfc_syntax_error (ST_NAMELIST);
4084 /* Match a MODULE statement. */
4087 gfc_match_module (void)
4091 m = gfc_match (" %s%t", &gfc_new_block);
4095 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
4096 gfc_new_block->name, NULL) == FAILURE)
4103 /* Free equivalence sets and lists. Recursively is the easiest way to
4107 gfc_free_equiv_until (gfc_equiv *eq, gfc_equiv *stop)
4112 gfc_free_equiv (eq->eq);
4113 gfc_free_equiv_until (eq->next, stop);
4114 gfc_free_expr (eq->expr);
4120 gfc_free_equiv (gfc_equiv *eq)
4122 gfc_free_equiv_until (eq, NULL);
4126 /* Match an EQUIVALENCE statement. */
4129 gfc_match_equivalence (void)
4131 gfc_equiv *eq, *set, *tail;
4135 gfc_common_head *common_head = NULL;
4143 eq = gfc_get_equiv ();
4147 eq->next = gfc_current_ns->equiv;
4148 gfc_current_ns->equiv = eq;
4150 if (gfc_match_char ('(') != MATCH_YES)
4154 common_flag = FALSE;
4159 m = gfc_match_equiv_variable (&set->expr);
4160 if (m == MATCH_ERROR)
4165 /* count the number of objects. */
4168 if (gfc_match_char ('%') == MATCH_YES)
4170 gfc_error ("Derived type component %C is not a "
4171 "permitted EQUIVALENCE member");
4175 for (ref = set->expr->ref; ref; ref = ref->next)
4176 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
4178 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
4179 "be an array section");
4183 sym = set->expr->symtree->n.sym;
4185 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
4188 if (sym->attr.in_common)
4191 common_head = sym->common_head;
4194 if (gfc_match_char (')') == MATCH_YES)
4197 if (gfc_match_char (',') != MATCH_YES)
4200 set->eq = gfc_get_equiv ();
4206 gfc_error ("EQUIVALENCE at %C requires two or more objects");
4210 /* If one of the members of an equivalence is in common, then
4211 mark them all as being in common. Before doing this, check
4212 that members of the equivalence group are not in different
4215 for (set = eq; set; set = set->eq)
4217 sym = set->expr->symtree->n.sym;
4218 if (sym->common_head && sym->common_head != common_head)
4220 gfc_error ("Attempt to indirectly overlap COMMON "
4221 "blocks %s and %s by EQUIVALENCE at %C",
4222 sym->common_head->name, common_head->name);
4225 sym->attr.in_common = 1;
4226 sym->common_head = common_head;
4229 if (gfc_match_eos () == MATCH_YES)
4231 if (gfc_match_char (',') != MATCH_YES)
4233 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
4241 gfc_syntax_error (ST_EQUIVALENCE);
4247 gfc_free_equiv (gfc_current_ns->equiv);
4248 gfc_current_ns->equiv = eq;
4254 /* Check that a statement function is not recursive. This is done by looking
4255 for the statement function symbol(sym) by looking recursively through its
4256 expression(e). If a reference to sym is found, true is returned.
4257 12.5.4 requires that any variable of function that is implicitly typed
4258 shall have that type confirmed by any subsequent type declaration. The
4259 implicit typing is conveniently done here. */
4261 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4264 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4270 switch (e->expr_type)
4273 if (e->symtree == NULL)
4276 /* Check the name before testing for nested recursion! */
4277 if (sym->name == e->symtree->n.sym->name)
4280 /* Catch recursion via other statement functions. */
4281 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4282 && e->symtree->n.sym->value
4283 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4286 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4287 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4292 if (e->symtree && sym->name == e->symtree->n.sym->name)
4295 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4296 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4308 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4310 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4314 /* Match a statement function declaration. It is so easy to match
4315 non-statement function statements with a MATCH_ERROR as opposed to
4316 MATCH_NO that we suppress error message in most cases. */
4319 gfc_match_st_function (void)
4321 gfc_error_buf old_error;
4326 m = gfc_match_symbol (&sym, 0);
4330 gfc_push_error (&old_error);
4332 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4333 sym->name, NULL) == FAILURE)
4336 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4339 m = gfc_match (" = %e%t", &expr);
4343 gfc_free_error (&old_error);
4344 if (m == MATCH_ERROR)
4347 if (recursive_stmt_fcn (expr, sym))
4349 gfc_error ("Statement function at %L is recursive", &expr->where);
4355 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4356 "Statement function at %C") == FAILURE)
4362 gfc_pop_error (&old_error);
4367 /***************** SELECT CASE subroutines ******************/
4369 /* Free a single case structure. */
4372 free_case (gfc_case *p)
4374 if (p->low == p->high)
4376 gfc_free_expr (p->low);
4377 gfc_free_expr (p->high);
4382 /* Free a list of case structures. */
4385 gfc_free_case_list (gfc_case *p)
4397 /* Match a single case selector. */
4400 match_case_selector (gfc_case **cp)
4405 c = gfc_get_case ();
4406 c->where = gfc_current_locus;
4408 if (gfc_match_char (':') == MATCH_YES)
4410 m = gfc_match_init_expr (&c->high);
4413 if (m == MATCH_ERROR)
4418 m = gfc_match_init_expr (&c->low);
4419 if (m == MATCH_ERROR)
4424 /* If we're not looking at a ':' now, make a range out of a single
4425 target. Else get the upper bound for the case range. */
4426 if (gfc_match_char (':') != MATCH_YES)
4430 m = gfc_match_init_expr (&c->high);
4431 if (m == MATCH_ERROR)
4433 /* MATCH_NO is fine. It's OK if nothing is there! */
4441 gfc_error ("Expected initialization expression in CASE at %C");
4449 /* Match the end of a case statement. */
4452 match_case_eos (void)
4454 char name[GFC_MAX_SYMBOL_LEN + 1];
4457 if (gfc_match_eos () == MATCH_YES)
4460 /* If the case construct doesn't have a case-construct-name, we
4461 should have matched the EOS. */
4462 if (!gfc_current_block ())
4465 gfc_gobble_whitespace ();
4467 m = gfc_match_name (name);
4471 if (strcmp (name, gfc_current_block ()->name) != 0)
4473 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4474 gfc_current_block ()->name);
4478 return gfc_match_eos ();
4482 /* Match a SELECT statement. */
4485 gfc_match_select (void)
4490 m = gfc_match_label ();
4491 if (m == MATCH_ERROR)
4494 m = gfc_match (" select case ( %e )%t", &expr);
4498 new_st.op = EXEC_SELECT;
4499 new_st.expr1 = expr;
4505 /* Push the current selector onto the SELECT TYPE stack. */
4508 select_type_push (gfc_symbol *sel)
4510 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4511 top->selector = sel;
4513 top->prev = select_type_stack;
4515 select_type_stack = top;
4519 /* Set the temporary for the current SELECT TYPE selector. */
4522 select_type_set_tmp (gfc_typespec *ts)
4524 char name[GFC_MAX_SYMBOL_LEN];
4529 select_type_stack->tmp = NULL;
4533 if (!gfc_type_is_extensible (ts->u.derived))
4536 if (ts->type == BT_CLASS)
4537 sprintf (name, "__tmp_class_%s", ts->u.derived->name);
4539 sprintf (name, "__tmp_type_%s", ts->u.derived->name);
4540 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4541 gfc_add_type (tmp->n.sym, ts, NULL);
4542 gfc_set_sym_referenced (tmp->n.sym);
4543 if (select_type_stack->selector->ts.type == BT_CLASS &&
4544 CLASS_DATA (select_type_stack->selector)->attr.allocatable)
4545 gfc_add_allocatable (&tmp->n.sym->attr, NULL);
4547 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4548 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4549 if (ts->type == BT_CLASS)
4550 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4551 &tmp->n.sym->as, false);
4552 tmp->n.sym->attr.select_type_temporary = 1;
4554 /* Add an association for it, so the rest of the parser knows it is
4555 an associate-name. The target will be set during resolution. */
4556 tmp->n.sym->assoc = gfc_get_association_list ();
4557 tmp->n.sym->assoc->dangling = 1;
4558 tmp->n.sym->assoc->st = tmp;
4560 select_type_stack->tmp = tmp;
4564 /* Match a SELECT TYPE statement. */
4567 gfc_match_select_type (void)
4569 gfc_expr *expr1, *expr2 = NULL;
4571 char name[GFC_MAX_SYMBOL_LEN];
4573 m = gfc_match_label ();
4574 if (m == MATCH_ERROR)
4577 m = gfc_match (" select type ( ");
4581 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4583 m = gfc_match (" %n => %e", name, &expr2);
4586 expr1 = gfc_get_expr();
4587 expr1->expr_type = EXPR_VARIABLE;
4588 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4593 if (expr2->ts.type == BT_UNKNOWN)
4594 expr1->symtree->n.sym->attr.untyped = 1;
4596 expr1->symtree->n.sym->ts = expr2->ts;
4597 expr1->symtree->n.sym->attr.flavor = FL_VARIABLE;
4598 expr1->symtree->n.sym->attr.referenced = 1;
4599 expr1->symtree->n.sym->attr.class_ok = 1;
4603 m = gfc_match (" %e ", &expr1);
4608 m = gfc_match (" )%t");
4612 /* Check for F03:C811. */
4613 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4615 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4616 "use associate-name=>");
4621 new_st.op = EXEC_SELECT_TYPE;
4622 new_st.expr1 = expr1;
4623 new_st.expr2 = expr2;
4624 new_st.ext.block.ns = gfc_current_ns;
4626 select_type_push (expr1->symtree->n.sym);
4631 gfc_current_ns = gfc_current_ns->parent;
4636 /* Match a CASE statement. */
4639 gfc_match_case (void)
4641 gfc_case *c, *head, *tail;
4646 if (gfc_current_state () != COMP_SELECT)
4648 gfc_error ("Unexpected CASE statement at %C");
4652 if (gfc_match ("% default") == MATCH_YES)
4654 m = match_case_eos ();
4657 if (m == MATCH_ERROR)
4660 new_st.op = EXEC_SELECT;
4661 c = gfc_get_case ();
4662 c->where = gfc_current_locus;
4663 new_st.ext.block.case_list = c;
4667 if (gfc_match_char ('(') != MATCH_YES)
4672 if (match_case_selector (&c) == MATCH_ERROR)
4682 if (gfc_match_char (')') == MATCH_YES)
4684 if (gfc_match_char (',') != MATCH_YES)
4688 m = match_case_eos ();
4691 if (m == MATCH_ERROR)
4694 new_st.op = EXEC_SELECT;
4695 new_st.ext.block.case_list = head;
4700 gfc_error ("Syntax error in CASE specification at %C");
4703 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4708 /* Match a TYPE IS statement. */
4711 gfc_match_type_is (void)
4716 if (gfc_current_state () != COMP_SELECT_TYPE)
4718 gfc_error ("Unexpected TYPE IS statement at %C");
4722 if (gfc_match_char ('(') != MATCH_YES)
4725 c = gfc_get_case ();
4726 c->where = gfc_current_locus;
4728 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4729 match_type_spec here. */
4730 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4733 if (gfc_match_char (')') != MATCH_YES)
4736 m = match_case_eos ();
4739 if (m == MATCH_ERROR)
4742 new_st.op = EXEC_SELECT_TYPE;
4743 new_st.ext.block.case_list = c;
4745 /* Create temporary variable. */
4746 select_type_set_tmp (&c->ts);
4751 gfc_error ("Syntax error in TYPE IS specification at %C");
4755 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4760 /* Match a CLASS IS or CLASS DEFAULT statement. */
4763 gfc_match_class_is (void)
4768 if (gfc_current_state () != COMP_SELECT_TYPE)
4771 if (gfc_match ("% default") == MATCH_YES)
4773 m = match_case_eos ();
4776 if (m == MATCH_ERROR)
4779 new_st.op = EXEC_SELECT_TYPE;
4780 c = gfc_get_case ();
4781 c->where = gfc_current_locus;
4782 c->ts.type = BT_UNKNOWN;
4783 new_st.ext.block.case_list = c;
4784 select_type_set_tmp (NULL);
4788 m = gfc_match ("% is");
4791 if (m == MATCH_ERROR)
4794 if (gfc_match_char ('(') != MATCH_YES)
4797 c = gfc_get_case ();
4798 c->where = gfc_current_locus;
4800 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4803 if (c->ts.type == BT_DERIVED)
4804 c->ts.type = BT_CLASS;
4806 if (gfc_match_char (')') != MATCH_YES)
4809 m = match_case_eos ();
4812 if (m == MATCH_ERROR)
4815 new_st.op = EXEC_SELECT_TYPE;
4816 new_st.ext.block.case_list = c;
4818 /* Create temporary variable. */
4819 select_type_set_tmp (&c->ts);
4824 gfc_error ("Syntax error in CLASS IS specification at %C");
4828 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4833 /********************* WHERE subroutines ********************/
4835 /* Match the rest of a simple WHERE statement that follows an IF statement.
4839 match_simple_where (void)
4845 m = gfc_match (" ( %e )", &expr);
4849 m = gfc_match_assignment ();
4852 if (m == MATCH_ERROR)
4855 if (gfc_match_eos () != MATCH_YES)
4858 c = gfc_get_code ();
4862 c->next = gfc_get_code ();
4865 gfc_clear_new_st ();
4867 new_st.op = EXEC_WHERE;
4873 gfc_syntax_error (ST_WHERE);
4876 gfc_free_expr (expr);
4881 /* Match a WHERE statement. */
4884 gfc_match_where (gfc_statement *st)
4890 m0 = gfc_match_label ();
4891 if (m0 == MATCH_ERROR)
4894 m = gfc_match (" where ( %e )", &expr);
4898 if (gfc_match_eos () == MATCH_YES)
4900 *st = ST_WHERE_BLOCK;
4901 new_st.op = EXEC_WHERE;
4902 new_st.expr1 = expr;
4906 m = gfc_match_assignment ();
4908 gfc_syntax_error (ST_WHERE);
4912 gfc_free_expr (expr);
4916 /* We've got a simple WHERE statement. */
4918 c = gfc_get_code ();
4922 c->next = gfc_get_code ();
4925 gfc_clear_new_st ();
4927 new_st.op = EXEC_WHERE;
4934 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
4935 new_st if successful. */
4938 gfc_match_elsewhere (void)
4940 char name[GFC_MAX_SYMBOL_LEN + 1];
4944 if (gfc_current_state () != COMP_WHERE)
4946 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
4952 if (gfc_match_char ('(') == MATCH_YES)
4954 m = gfc_match_expr (&expr);
4957 if (m == MATCH_ERROR)
4960 if (gfc_match_char (')') != MATCH_YES)
4964 if (gfc_match_eos () != MATCH_YES)
4966 /* Only makes sense if we have a where-construct-name. */
4967 if (!gfc_current_block ())
4972 /* Better be a name at this point. */
4973 m = gfc_match_name (name);
4976 if (m == MATCH_ERROR)
4979 if (gfc_match_eos () != MATCH_YES)
4982 if (strcmp (name, gfc_current_block ()->name) != 0)
4984 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
4985 name, gfc_current_block ()->name);
4990 new_st.op = EXEC_WHERE;
4991 new_st.expr1 = expr;
4995 gfc_syntax_error (ST_ELSEWHERE);
4998 gfc_free_expr (expr);
5003 /******************** FORALL subroutines ********************/
5005 /* Free a list of FORALL iterators. */
5008 gfc_free_forall_iterator (gfc_forall_iterator *iter)
5010 gfc_forall_iterator *next;
5015 gfc_free_expr (iter->var);
5016 gfc_free_expr (iter->start);
5017 gfc_free_expr (iter->end);
5018 gfc_free_expr (iter->stride);
5025 /* Match an iterator as part of a FORALL statement. The format is:
5027 <var> = <start>:<end>[:<stride>]
5029 On MATCH_NO, the caller tests for the possibility that there is a
5030 scalar mask expression. */
5033 match_forall_iterator (gfc_forall_iterator **result)
5035 gfc_forall_iterator *iter;
5039 where = gfc_current_locus;
5040 iter = XCNEW (gfc_forall_iterator);
5042 m = gfc_match_expr (&iter->var);
5046 if (gfc_match_char ('=') != MATCH_YES
5047 || iter->var->expr_type != EXPR_VARIABLE)
5053 m = gfc_match_expr (&iter->start);
5057 if (gfc_match_char (':') != MATCH_YES)
5060 m = gfc_match_expr (&iter->end);
5063 if (m == MATCH_ERROR)
5066 if (gfc_match_char (':') == MATCH_NO)
5067 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
5070 m = gfc_match_expr (&iter->stride);
5073 if (m == MATCH_ERROR)
5077 /* Mark the iteration variable's symbol as used as a FORALL index. */
5078 iter->var->symtree->n.sym->forall_index = true;
5084 gfc_error ("Syntax error in FORALL iterator at %C");
5089 gfc_current_locus = where;
5090 gfc_free_forall_iterator (iter);
5095 /* Match the header of a FORALL statement. */
5098 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
5100 gfc_forall_iterator *head, *tail, *new_iter;
5104 gfc_gobble_whitespace ();
5109 if (gfc_match_char ('(') != MATCH_YES)
5112 m = match_forall_iterator (&new_iter);
5113 if (m == MATCH_ERROR)
5118 head = tail = new_iter;
5122 if (gfc_match_char (',') != MATCH_YES)
5125 m = match_forall_iterator (&new_iter);
5126 if (m == MATCH_ERROR)
5131 tail->next = new_iter;
5136 /* Have to have a mask expression. */
5138 m = gfc_match_expr (&msk);
5141 if (m == MATCH_ERROR)
5147 if (gfc_match_char (')') == MATCH_NO)
5155 gfc_syntax_error (ST_FORALL);
5158 gfc_free_expr (msk);
5159 gfc_free_forall_iterator (head);
5164 /* Match the rest of a simple FORALL statement that follows an
5168 match_simple_forall (void)
5170 gfc_forall_iterator *head;
5179 m = match_forall_header (&head, &mask);
5186 m = gfc_match_assignment ();
5188 if (m == MATCH_ERROR)
5192 m = gfc_match_pointer_assignment ();
5193 if (m == MATCH_ERROR)
5199 c = gfc_get_code ();
5201 c->loc = gfc_current_locus;
5203 if (gfc_match_eos () != MATCH_YES)
5206 gfc_clear_new_st ();
5207 new_st.op = EXEC_FORALL;
5208 new_st.expr1 = mask;
5209 new_st.ext.forall_iterator = head;
5210 new_st.block = gfc_get_code ();
5212 new_st.block->op = EXEC_FORALL;
5213 new_st.block->next = c;
5218 gfc_syntax_error (ST_FORALL);
5221 gfc_free_forall_iterator (head);
5222 gfc_free_expr (mask);
5228 /* Match a FORALL statement. */
5231 gfc_match_forall (gfc_statement *st)
5233 gfc_forall_iterator *head;
5242 m0 = gfc_match_label ();
5243 if (m0 == MATCH_ERROR)
5246 m = gfc_match (" forall");
5250 m = match_forall_header (&head, &mask);
5251 if (m == MATCH_ERROR)
5256 if (gfc_match_eos () == MATCH_YES)
5258 *st = ST_FORALL_BLOCK;
5259 new_st.op = EXEC_FORALL;
5260 new_st.expr1 = mask;
5261 new_st.ext.forall_iterator = head;
5265 m = gfc_match_assignment ();
5266 if (m == MATCH_ERROR)
5270 m = gfc_match_pointer_assignment ();
5271 if (m == MATCH_ERROR)
5277 c = gfc_get_code ();
5279 c->loc = gfc_current_locus;
5281 gfc_clear_new_st ();
5282 new_st.op = EXEC_FORALL;
5283 new_st.expr1 = mask;
5284 new_st.ext.forall_iterator = head;
5285 new_st.block = gfc_get_code ();
5286 new_st.block->op = EXEC_FORALL;
5287 new_st.block->next = c;
5293 gfc_syntax_error (ST_FORALL);
5296 gfc_free_forall_iterator (head);
5297 gfc_free_expr (mask);
5298 gfc_free_statements (c);