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 ("lock", gfc_match_lock, ST_LOCK)
1565 match ("nullify", gfc_match_nullify, ST_NULLIFY)
1566 match ("open", gfc_match_open, ST_OPEN)
1567 match ("pause", gfc_match_pause, ST_NONE)
1568 match ("print", gfc_match_print, ST_WRITE)
1569 match ("read", gfc_match_read, ST_READ)
1570 match ("return", gfc_match_return, ST_RETURN)
1571 match ("rewind", gfc_match_rewind, ST_REWIND)
1572 match ("stop", gfc_match_stop, ST_STOP)
1573 match ("wait", gfc_match_wait, ST_WAIT)
1574 match ("sync all", gfc_match_sync_all, ST_SYNC_CALL);
1575 match ("sync images", gfc_match_sync_images, ST_SYNC_IMAGES);
1576 match ("sync memory", gfc_match_sync_memory, ST_SYNC_MEMORY);
1577 match ("unlock", gfc_match_unlock, ST_UNLOCK)
1578 match ("where", match_simple_where, ST_WHERE)
1579 match ("write", gfc_match_write, ST_WRITE)
1581 /* The gfc_match_assignment() above may have returned a MATCH_NO
1582 where the assignment was to a named constant. Check that
1583 special case here. */
1584 m = gfc_match_assignment ();
1587 gfc_error ("Cannot assign to a named constant at %C");
1588 gfc_free_expr (expr);
1589 gfc_undo_symbols ();
1590 gfc_current_locus = old_loc;
1594 /* All else has failed, so give up. See if any of the matchers has
1595 stored an error message of some sort. */
1596 if (gfc_error_check () == 0)
1597 gfc_error ("Unclassifiable statement in IF-clause at %C");
1599 gfc_free_expr (expr);
1604 gfc_error ("Syntax error in IF-clause at %C");
1607 gfc_free_expr (expr);
1611 /* At this point, we've matched the single IF and the action clause
1612 is in new_st. Rearrange things so that the IF statement appears
1615 p = gfc_get_code ();
1616 p->next = gfc_get_code ();
1618 p->next->loc = gfc_current_locus;
1623 gfc_clear_new_st ();
1625 new_st.op = EXEC_IF;
1634 /* Match an ELSE statement. */
1637 gfc_match_else (void)
1639 char name[GFC_MAX_SYMBOL_LEN + 1];
1641 if (gfc_match_eos () == MATCH_YES)
1644 if (gfc_match_name (name) != MATCH_YES
1645 || gfc_current_block () == NULL
1646 || gfc_match_eos () != MATCH_YES)
1648 gfc_error ("Unexpected junk after ELSE statement at %C");
1652 if (strcmp (name, gfc_current_block ()->name) != 0)
1654 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1655 name, gfc_current_block ()->name);
1663 /* Match an ELSE IF statement. */
1666 gfc_match_elseif (void)
1668 char name[GFC_MAX_SYMBOL_LEN + 1];
1672 m = gfc_match (" ( %e ) then", &expr);
1676 if (gfc_match_eos () == MATCH_YES)
1679 if (gfc_match_name (name) != MATCH_YES
1680 || gfc_current_block () == NULL
1681 || gfc_match_eos () != MATCH_YES)
1683 gfc_error ("Unexpected junk after ELSE IF statement at %C");
1687 if (strcmp (name, gfc_current_block ()->name) != 0)
1689 gfc_error ("Label '%s' at %C doesn't match IF label '%s'",
1690 name, gfc_current_block ()->name);
1695 new_st.op = EXEC_IF;
1696 new_st.expr1 = expr;
1700 gfc_free_expr (expr);
1705 /* Free a gfc_iterator structure. */
1708 gfc_free_iterator (gfc_iterator *iter, int flag)
1714 gfc_free_expr (iter->var);
1715 gfc_free_expr (iter->start);
1716 gfc_free_expr (iter->end);
1717 gfc_free_expr (iter->step);
1724 /* Match a CRITICAL statement. */
1726 gfc_match_critical (void)
1728 gfc_st_label *label = NULL;
1730 if (gfc_match_label () == MATCH_ERROR)
1733 if (gfc_match (" critical") != MATCH_YES)
1736 if (gfc_match_st_label (&label) == MATCH_ERROR)
1739 if (gfc_match_eos () != MATCH_YES)
1741 gfc_syntax_error (ST_CRITICAL);
1745 if (gfc_pure (NULL))
1747 gfc_error ("Image control statement CRITICAL at %C in PURE procedure");
1751 if (gfc_implicit_pure (NULL))
1752 gfc_current_ns->proc_name->attr.implicit_pure = 0;
1754 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: CRITICAL statement at %C")
1758 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
1760 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
1764 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
1766 gfc_error ("Nested CRITICAL block at %C");
1770 new_st.op = EXEC_CRITICAL;
1773 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1780 /* Match a BLOCK statement. */
1783 gfc_match_block (void)
1787 if (gfc_match_label () == MATCH_ERROR)
1790 if (gfc_match (" block") != MATCH_YES)
1793 /* For this to be a correct BLOCK statement, the line must end now. */
1794 m = gfc_match_eos ();
1795 if (m == MATCH_ERROR)
1804 /* Match an ASSOCIATE statement. */
1807 gfc_match_associate (void)
1809 if (gfc_match_label () == MATCH_ERROR)
1812 if (gfc_match (" associate") != MATCH_YES)
1815 /* Match the association list. */
1816 if (gfc_match_char ('(') != MATCH_YES)
1818 gfc_error ("Expected association list at %C");
1821 new_st.ext.block.assoc = NULL;
1824 gfc_association_list* newAssoc = gfc_get_association_list ();
1825 gfc_association_list* a;
1827 /* Match the next association. */
1828 if (gfc_match (" %n => %e", newAssoc->name, &newAssoc->target)
1831 gfc_error ("Expected association at %C");
1832 goto assocListError;
1834 newAssoc->where = gfc_current_locus;
1836 /* Check that the current name is not yet in the list. */
1837 for (a = new_st.ext.block.assoc; a; a = a->next)
1838 if (!strcmp (a->name, newAssoc->name))
1840 gfc_error ("Duplicate name '%s' in association at %C",
1842 goto assocListError;
1845 /* The target expression must not be coindexed. */
1846 if (gfc_is_coindexed (newAssoc->target))
1848 gfc_error ("Association target at %C must not be coindexed");
1849 goto assocListError;
1852 /* The `variable' field is left blank for now; because the target is not
1853 yet resolved, we can't use gfc_has_vector_subscript to determine it
1854 for now. This is set during resolution. */
1856 /* Put it into the list. */
1857 newAssoc->next = new_st.ext.block.assoc;
1858 new_st.ext.block.assoc = newAssoc;
1860 /* Try next one or end if closing parenthesis is found. */
1861 gfc_gobble_whitespace ();
1862 if (gfc_peek_char () == ')')
1864 if (gfc_match_char (',') != MATCH_YES)
1866 gfc_error ("Expected ')' or ',' at %C");
1876 if (gfc_match_char (')') != MATCH_YES)
1878 /* This should never happen as we peek above. */
1882 if (gfc_match_eos () != MATCH_YES)
1884 gfc_error ("Junk after ASSOCIATE statement at %C");
1891 gfc_free_association_list (new_st.ext.block.assoc);
1896 /* Match a DO statement. */
1901 gfc_iterator iter, *ip;
1903 gfc_st_label *label;
1906 old_loc = gfc_current_locus;
1909 iter.var = iter.start = iter.end = iter.step = NULL;
1911 m = gfc_match_label ();
1912 if (m == MATCH_ERROR)
1915 if (gfc_match (" do") != MATCH_YES)
1918 m = gfc_match_st_label (&label);
1919 if (m == MATCH_ERROR)
1922 /* Match an infinite DO, make it like a DO WHILE(.TRUE.). */
1924 if (gfc_match_eos () == MATCH_YES)
1926 iter.end = gfc_get_logical_expr (gfc_default_logical_kind, NULL, true);
1927 new_st.op = EXEC_DO_WHILE;
1931 /* Match an optional comma, if no comma is found, a space is obligatory. */
1932 if (gfc_match_char (',') != MATCH_YES && gfc_match ("% ") != MATCH_YES)
1935 /* Check for balanced parens. */
1937 if (gfc_match_parens () == MATCH_ERROR)
1940 /* See if we have a DO WHILE. */
1941 if (gfc_match (" while ( %e )%t", &iter.end) == MATCH_YES)
1943 new_st.op = EXEC_DO_WHILE;
1947 /* The abortive DO WHILE may have done something to the symbol
1948 table, so we start over. */
1949 gfc_undo_symbols ();
1950 gfc_current_locus = old_loc;
1952 gfc_match_label (); /* This won't error. */
1953 gfc_match (" do "); /* This will work. */
1955 gfc_match_st_label (&label); /* Can't error out. */
1956 gfc_match_char (','); /* Optional comma. */
1958 m = gfc_match_iterator (&iter, 0);
1961 if (m == MATCH_ERROR)
1964 iter.var->symtree->n.sym->attr.implied_index = 0;
1965 gfc_check_do_variable (iter.var->symtree);
1967 if (gfc_match_eos () != MATCH_YES)
1969 gfc_syntax_error (ST_DO);
1973 new_st.op = EXEC_DO;
1977 && gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
1980 new_st.label1 = label;
1982 if (new_st.op == EXEC_DO_WHILE)
1983 new_st.expr1 = iter.end;
1986 new_st.ext.iterator = ip = gfc_get_iterator ();
1993 gfc_free_iterator (&iter, 0);
1999 /* Match an EXIT or CYCLE statement. */
2002 match_exit_cycle (gfc_statement st, gfc_exec_op op)
2004 gfc_state_data *p, *o;
2009 if (gfc_match_eos () == MATCH_YES)
2013 char name[GFC_MAX_SYMBOL_LEN + 1];
2016 m = gfc_match ("% %n%t", name);
2017 if (m == MATCH_ERROR)
2021 gfc_syntax_error (st);
2025 /* Find the corresponding symbol. If there's a BLOCK statement
2026 between here and the label, it is not in gfc_current_ns but a parent
2028 stree = gfc_find_symtree_in_proc (name, gfc_current_ns);
2031 gfc_error ("Name '%s' in %s statement at %C is unknown",
2032 name, gfc_ascii_statement (st));
2037 if (sym->attr.flavor != FL_LABEL)
2039 gfc_error ("Name '%s' in %s statement at %C is not a construct name",
2040 name, gfc_ascii_statement (st));
2045 /* Find the loop specified by the label (or lack of a label). */
2046 for (o = NULL, p = gfc_state_stack; p; p = p->previous)
2047 if (o == NULL && p->state == COMP_OMP_STRUCTURED_BLOCK)
2049 else if (p->state == COMP_CRITICAL)
2051 gfc_error("%s statement at %C leaves CRITICAL construct",
2052 gfc_ascii_statement (st));
2055 else if ((sym && sym == p->sym) || (!sym && p->state == COMP_DO))
2061 gfc_error ("%s statement at %C is not within a construct",
2062 gfc_ascii_statement (st));
2064 gfc_error ("%s statement at %C is not within construct '%s'",
2065 gfc_ascii_statement (st), sym->name);
2070 /* Special checks for EXIT from non-loop constructs. */
2077 /* This is already handled above. */
2080 case COMP_ASSOCIATE:
2084 case COMP_SELECT_TYPE:
2086 if (op == EXEC_CYCLE)
2088 gfc_error ("CYCLE statement at %C is not applicable to non-loop"
2089 " construct '%s'", sym->name);
2092 gcc_assert (op == EXEC_EXIT);
2093 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: EXIT statement with no"
2094 " do-construct-name at %C") == FAILURE)
2099 gfc_error ("%s statement at %C is not applicable to construct '%s'",
2100 gfc_ascii_statement (st), sym->name);
2106 gfc_error ("%s statement at %C leaving OpenMP structured block",
2107 gfc_ascii_statement (st));
2111 for (o = p, cnt = 0; o->state == COMP_DO && o->previous != NULL; cnt++)
2115 && o->state == COMP_OMP_STRUCTURED_BLOCK
2116 && (o->head->op == EXEC_OMP_DO
2117 || o->head->op == EXEC_OMP_PARALLEL_DO))
2120 gcc_assert (o->head->next != NULL
2121 && (o->head->next->op == EXEC_DO
2122 || o->head->next->op == EXEC_DO_WHILE)
2123 && o->previous != NULL
2124 && o->previous->tail->op == o->head->op);
2125 if (o->previous->tail->ext.omp_clauses != NULL
2126 && o->previous->tail->ext.omp_clauses->collapse > 1)
2127 collapse = o->previous->tail->ext.omp_clauses->collapse;
2128 if (st == ST_EXIT && cnt <= collapse)
2130 gfc_error ("EXIT statement at %C terminating !$OMP DO loop");
2133 if (st == ST_CYCLE && cnt < collapse)
2135 gfc_error ("CYCLE statement at %C to non-innermost collapsed"
2141 /* Save the first statement in the construct - needed by the backend. */
2142 new_st.ext.which_construct = p->construct;
2150 /* Match the EXIT statement. */
2153 gfc_match_exit (void)
2155 return match_exit_cycle (ST_EXIT, EXEC_EXIT);
2159 /* Match the CYCLE statement. */
2162 gfc_match_cycle (void)
2164 return match_exit_cycle (ST_CYCLE, EXEC_CYCLE);
2168 /* Match a number or character constant after an (ALL) STOP or PAUSE statement. */
2171 gfc_match_stopcode (gfc_statement st)
2178 if (gfc_match_eos () != MATCH_YES)
2180 m = gfc_match_init_expr (&e);
2181 if (m == MATCH_ERROR)
2186 if (gfc_match_eos () != MATCH_YES)
2190 if (gfc_pure (NULL))
2192 gfc_error ("%s statement not allowed in PURE procedure at %C",
2193 gfc_ascii_statement (st));
2197 if (gfc_implicit_pure (NULL))
2198 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2200 if (st == ST_STOP && gfc_find_state (COMP_CRITICAL) == SUCCESS)
2202 gfc_error ("Image control statement STOP at %C in CRITICAL block");
2208 if (!(e->ts.type == BT_CHARACTER || e->ts.type == BT_INTEGER))
2210 gfc_error ("STOP code at %L must be either INTEGER or CHARACTER type",
2217 gfc_error ("STOP code at %L must be scalar",
2222 if (e->ts.type == BT_CHARACTER
2223 && e->ts.kind != gfc_default_character_kind)
2225 gfc_error ("STOP code at %L must be default character KIND=%d",
2226 &e->where, (int) gfc_default_character_kind);
2230 if (e->ts.type == BT_INTEGER
2231 && e->ts.kind != gfc_default_integer_kind)
2233 gfc_error ("STOP code at %L must be default integer KIND=%d",
2234 &e->where, (int) gfc_default_integer_kind);
2242 new_st.op = EXEC_STOP;
2245 new_st.op = EXEC_ERROR_STOP;
2248 new_st.op = EXEC_PAUSE;
2255 new_st.ext.stop_code = -1;
2260 gfc_syntax_error (st);
2269 /* Match the (deprecated) PAUSE statement. */
2272 gfc_match_pause (void)
2276 m = gfc_match_stopcode (ST_PAUSE);
2279 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: PAUSE statement"
2288 /* Match the STOP statement. */
2291 gfc_match_stop (void)
2293 return gfc_match_stopcode (ST_STOP);
2297 /* Match the ERROR STOP statement. */
2300 gfc_match_error_stop (void)
2302 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: ERROR STOP statement at %C")
2306 return gfc_match_stopcode (ST_ERROR_STOP);
2310 /* Match LOCK/UNLOCK statement. Syntax:
2311 LOCK ( lock-variable [ , lock-stat-list ] )
2312 UNLOCK ( lock-variable [ , sync-stat-list ] )
2313 where lock-stat is ACQUIRED_LOCK or sync-stat
2314 and sync-stat is STAT= or ERRMSG=. */
2317 lock_unlock_statement (gfc_statement st)
2320 gfc_expr *tmp, *lockvar, *acq_lock, *stat, *errmsg;
2321 bool saw_acq_lock, saw_stat, saw_errmsg;
2323 tmp = lockvar = acq_lock = stat = errmsg = NULL;
2324 saw_acq_lock = saw_stat = saw_errmsg = false;
2326 if (gfc_pure (NULL))
2328 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2332 if (gfc_implicit_pure (NULL))
2333 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2335 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2337 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2341 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2343 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2347 if (gfc_match_char ('(') != MATCH_YES)
2350 if (gfc_match ("%e", &lockvar) != MATCH_YES)
2352 m = gfc_match_char (',');
2353 if (m == MATCH_ERROR)
2357 m = gfc_match_char (')');
2365 m = gfc_match (" stat = %v", &tmp);
2366 if (m == MATCH_ERROR)
2372 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2378 m = gfc_match_char (',');
2386 m = gfc_match (" errmsg = %v", &tmp);
2387 if (m == MATCH_ERROR)
2393 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2399 m = gfc_match_char (',');
2407 m = gfc_match (" acquired_lock = %v", &tmp);
2408 if (m == MATCH_ERROR || st == ST_UNLOCK)
2414 gfc_error ("Redundant ACQUIRED_LOCK tag found at %L ",
2419 saw_acq_lock = true;
2421 m = gfc_match_char (',');
2432 if (m == MATCH_ERROR)
2435 if (gfc_match (" )%t") != MATCH_YES)
2442 new_st.op = EXEC_LOCK;
2445 new_st.op = EXEC_UNLOCK;
2451 new_st.expr1 = lockvar;
2452 new_st.expr2 = stat;
2453 new_st.expr3 = errmsg;
2454 new_st.expr4 = acq_lock;
2459 gfc_syntax_error (st);
2462 gfc_free_expr (tmp);
2463 gfc_free_expr (lockvar);
2464 gfc_free_expr (acq_lock);
2465 gfc_free_expr (stat);
2466 gfc_free_expr (errmsg);
2473 gfc_match_lock (void)
2475 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: LOCK statement at %C")
2479 return lock_unlock_statement (ST_LOCK);
2484 gfc_match_unlock (void)
2486 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: UNLOCK statement at %C")
2490 return lock_unlock_statement (ST_UNLOCK);
2494 /* Match SYNC ALL/IMAGES/MEMORY statement. Syntax:
2495 SYNC ALL [(sync-stat-list)]
2496 SYNC MEMORY [(sync-stat-list)]
2497 SYNC IMAGES (image-set [, sync-stat-list] )
2498 with sync-stat is int-expr or *. */
2501 sync_statement (gfc_statement st)
2504 gfc_expr *tmp, *imageset, *stat, *errmsg;
2505 bool saw_stat, saw_errmsg;
2507 tmp = imageset = stat = errmsg = NULL;
2508 saw_stat = saw_errmsg = false;
2510 if (gfc_pure (NULL))
2512 gfc_error ("Image control statement SYNC at %C in PURE procedure");
2516 if (gfc_implicit_pure (NULL))
2517 gfc_current_ns->proc_name->attr.implicit_pure = 0;
2519 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: SYNC statement at %C")
2523 if (gfc_option.coarray == GFC_FCOARRAY_NONE)
2525 gfc_fatal_error ("Coarrays disabled at %C, use -fcoarray= to enable");
2529 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
2531 gfc_error ("Image control statement SYNC at %C in CRITICAL block");
2535 if (gfc_match_eos () == MATCH_YES)
2537 if (st == ST_SYNC_IMAGES)
2542 if (gfc_match_char ('(') != MATCH_YES)
2545 if (st == ST_SYNC_IMAGES)
2547 /* Denote '*' as imageset == NULL. */
2548 m = gfc_match_char ('*');
2549 if (m == MATCH_ERROR)
2553 if (gfc_match ("%e", &imageset) != MATCH_YES)
2556 m = gfc_match_char (',');
2557 if (m == MATCH_ERROR)
2561 m = gfc_match_char (')');
2570 m = gfc_match (" stat = %v", &tmp);
2571 if (m == MATCH_ERROR)
2577 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
2583 if (gfc_match_char (',') == MATCH_YES)
2590 m = gfc_match (" errmsg = %v", &tmp);
2591 if (m == MATCH_ERROR)
2597 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
2603 if (gfc_match_char (',') == MATCH_YES)
2613 if (m == MATCH_ERROR)
2616 if (gfc_match (" )%t") != MATCH_YES)
2623 new_st.op = EXEC_SYNC_ALL;
2625 case ST_SYNC_IMAGES:
2626 new_st.op = EXEC_SYNC_IMAGES;
2628 case ST_SYNC_MEMORY:
2629 new_st.op = EXEC_SYNC_MEMORY;
2635 new_st.expr1 = imageset;
2636 new_st.expr2 = stat;
2637 new_st.expr3 = errmsg;
2642 gfc_syntax_error (st);
2645 gfc_free_expr (tmp);
2646 gfc_free_expr (imageset);
2647 gfc_free_expr (stat);
2648 gfc_free_expr (errmsg);
2654 /* Match SYNC ALL statement. */
2657 gfc_match_sync_all (void)
2659 return sync_statement (ST_SYNC_ALL);
2663 /* Match SYNC IMAGES statement. */
2666 gfc_match_sync_images (void)
2668 return sync_statement (ST_SYNC_IMAGES);
2672 /* Match SYNC MEMORY statement. */
2675 gfc_match_sync_memory (void)
2677 return sync_statement (ST_SYNC_MEMORY);
2681 /* Match a CONTINUE statement. */
2684 gfc_match_continue (void)
2686 if (gfc_match_eos () != MATCH_YES)
2688 gfc_syntax_error (ST_CONTINUE);
2692 new_st.op = EXEC_CONTINUE;
2697 /* Match the (deprecated) ASSIGN statement. */
2700 gfc_match_assign (void)
2703 gfc_st_label *label;
2705 if (gfc_match (" %l", &label) == MATCH_YES)
2707 if (gfc_reference_st_label (label, ST_LABEL_UNKNOWN) == FAILURE)
2709 if (gfc_match (" to %v%t", &expr) == MATCH_YES)
2711 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: ASSIGN "
2716 expr->symtree->n.sym->attr.assign = 1;
2718 new_st.op = EXEC_LABEL_ASSIGN;
2719 new_st.label1 = label;
2720 new_st.expr1 = expr;
2728 /* Match the GO TO statement. As a computed GOTO statement is
2729 matched, it is transformed into an equivalent SELECT block. No
2730 tree is necessary, and the resulting jumps-to-jumps are
2731 specifically optimized away by the back end. */
2734 gfc_match_goto (void)
2736 gfc_code *head, *tail;
2739 gfc_st_label *label;
2743 if (gfc_match (" %l%t", &label) == MATCH_YES)
2745 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2748 new_st.op = EXEC_GOTO;
2749 new_st.label1 = label;
2753 /* The assigned GO TO statement. */
2755 if (gfc_match_variable (&expr, 0) == MATCH_YES)
2757 if (gfc_notify_std (GFC_STD_F95_DEL, "Deleted feature: Assigned GOTO "
2762 new_st.op = EXEC_GOTO;
2763 new_st.expr1 = expr;
2765 if (gfc_match_eos () == MATCH_YES)
2768 /* Match label list. */
2769 gfc_match_char (',');
2770 if (gfc_match_char ('(') != MATCH_YES)
2772 gfc_syntax_error (ST_GOTO);
2779 m = gfc_match_st_label (&label);
2783 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2787 head = tail = gfc_get_code ();
2790 tail->block = gfc_get_code ();
2794 tail->label1 = label;
2795 tail->op = EXEC_GOTO;
2797 while (gfc_match_char (',') == MATCH_YES);
2799 if (gfc_match (")%t") != MATCH_YES)
2804 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2807 new_st.block = head;
2812 /* Last chance is a computed GO TO statement. */
2813 if (gfc_match_char ('(') != MATCH_YES)
2815 gfc_syntax_error (ST_GOTO);
2824 m = gfc_match_st_label (&label);
2828 if (gfc_reference_st_label (label, ST_LABEL_TARGET) == FAILURE)
2832 head = tail = gfc_get_code ();
2835 tail->block = gfc_get_code ();
2839 cp = gfc_get_case ();
2840 cp->low = cp->high = gfc_get_int_expr (gfc_default_integer_kind,
2843 tail->op = EXEC_SELECT;
2844 tail->ext.block.case_list = cp;
2846 tail->next = gfc_get_code ();
2847 tail->next->op = EXEC_GOTO;
2848 tail->next->label1 = label;
2850 while (gfc_match_char (',') == MATCH_YES);
2852 if (gfc_match_char (')') != MATCH_YES)
2857 gfc_error ("Statement label list in GOTO at %C cannot be empty");
2861 /* Get the rest of the statement. */
2862 gfc_match_char (',');
2864 if (gfc_match (" %e%t", &expr) != MATCH_YES)
2867 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Computed GOTO "
2868 "at %C") == FAILURE)
2871 /* At this point, a computed GOTO has been fully matched and an
2872 equivalent SELECT statement constructed. */
2874 new_st.op = EXEC_SELECT;
2875 new_st.expr1 = NULL;
2877 /* Hack: For a "real" SELECT, the expression is in expr. We put
2878 it in expr2 so we can distinguish then and produce the correct
2880 new_st.expr2 = expr;
2881 new_st.block = head;
2885 gfc_syntax_error (ST_GOTO);
2887 gfc_free_statements (head);
2892 /* Frees a list of gfc_alloc structures. */
2895 gfc_free_alloc_list (gfc_alloc *p)
2902 gfc_free_expr (p->expr);
2908 /* Match a Fortran 2003 derived-type-spec (F03:R455), which is just the name of
2909 an accessible derived type. */
2912 match_derived_type_spec (gfc_typespec *ts)
2914 char name[GFC_MAX_SYMBOL_LEN + 1];
2916 gfc_symbol *derived;
2918 old_locus = gfc_current_locus;
2920 if (gfc_match ("%n", name) != MATCH_YES)
2922 gfc_current_locus = old_locus;
2926 gfc_find_symbol (name, NULL, 1, &derived);
2928 if (derived && derived->attr.flavor == FL_DERIVED)
2930 ts->type = BT_DERIVED;
2931 ts->u.derived = derived;
2935 gfc_current_locus = old_locus;
2940 /* Match a Fortran 2003 type-spec (F03:R401). This is similar to
2941 gfc_match_decl_type_spec() from decl.c, with the following exceptions:
2942 It only includes the intrinsic types from the Fortran 2003 standard
2943 (thus, neither BYTE nor forms like REAL*4 are allowed). Additionally,
2944 the implicit_flag is not needed, so it was removed. Derived types are
2945 identified by their name alone. */
2948 match_type_spec (gfc_typespec *ts)
2954 gfc_gobble_whitespace ();
2955 old_locus = gfc_current_locus;
2957 if (match_derived_type_spec (ts) == MATCH_YES)
2959 /* Enforce F03:C401. */
2960 if (ts->u.derived->attr.abstract)
2962 gfc_error ("Derived type '%s' at %L may not be ABSTRACT",
2963 ts->u.derived->name, &old_locus);
2969 if (gfc_match ("integer") == MATCH_YES)
2971 ts->type = BT_INTEGER;
2972 ts->kind = gfc_default_integer_kind;
2976 if (gfc_match ("real") == MATCH_YES)
2979 ts->kind = gfc_default_real_kind;
2983 if (gfc_match ("double precision") == MATCH_YES)
2986 ts->kind = gfc_default_double_kind;
2990 if (gfc_match ("complex") == MATCH_YES)
2992 ts->type = BT_COMPLEX;
2993 ts->kind = gfc_default_complex_kind;
2997 if (gfc_match ("character") == MATCH_YES)
2999 ts->type = BT_CHARACTER;
3001 m = gfc_match_char_spec (ts);
3009 if (gfc_match ("logical") == MATCH_YES)
3011 ts->type = BT_LOGICAL;
3012 ts->kind = gfc_default_logical_kind;
3016 /* If a type is not matched, simply return MATCH_NO. */
3017 gfc_current_locus = old_locus;
3022 gfc_gobble_whitespace ();
3023 if (gfc_peek_ascii_char () == '*')
3025 gfc_error ("Invalid type-spec at %C");
3029 m = gfc_match_kind_spec (ts, false);
3032 m = MATCH_YES; /* No kind specifier found. */
3038 /* Match an ALLOCATE statement. */
3041 gfc_match_allocate (void)
3043 gfc_alloc *head, *tail;
3044 gfc_expr *stat, *errmsg, *tmp, *source, *mold;
3048 locus old_locus, deferred_locus;
3049 bool saw_stat, saw_errmsg, saw_source, saw_mold, saw_deferred, b1, b2, b3;
3052 stat = errmsg = source = mold = tmp = NULL;
3053 saw_stat = saw_errmsg = saw_source = saw_mold = saw_deferred = false;
3055 if (gfc_match_char ('(') != MATCH_YES)
3058 /* Match an optional type-spec. */
3059 old_locus = gfc_current_locus;
3060 m = match_type_spec (&ts);
3061 if (m == MATCH_ERROR)
3063 else if (m == MATCH_NO)
3065 char name[GFC_MAX_SYMBOL_LEN + 3];
3067 if (gfc_match ("%n :: ", name) == MATCH_YES)
3069 gfc_error ("Error in type-spec at %L", &old_locus);
3073 ts.type = BT_UNKNOWN;
3077 if (gfc_match (" :: ") == MATCH_YES)
3079 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: typespec in "
3080 "ALLOCATE at %L", &old_locus) == FAILURE)
3085 gfc_error ("Type-spec at %L cannot contain a deferred "
3086 "type parameter", &old_locus);
3092 ts.type = BT_UNKNOWN;
3093 gfc_current_locus = old_locus;
3100 head = tail = gfc_get_alloc ();
3103 tail->next = gfc_get_alloc ();
3107 m = gfc_match_variable (&tail->expr, 0);
3110 if (m == MATCH_ERROR)
3113 if (gfc_check_do_variable (tail->expr->symtree))
3116 if (gfc_pure (NULL) && gfc_impure_variable (tail->expr->symtree->n.sym))
3118 gfc_error ("Bad allocate-object at %C for a PURE procedure");
3122 if (gfc_implicit_pure (NULL)
3123 && gfc_impure_variable (tail->expr->symtree->n.sym))
3124 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3126 if (tail->expr->ts.deferred)
3128 saw_deferred = true;
3129 deferred_locus = tail->expr->where;
3132 /* The ALLOCATE statement had an optional typespec. Check the
3134 if (ts.type != BT_UNKNOWN)
3136 /* Enforce F03:C624. */
3137 if (!gfc_type_compatible (&tail->expr->ts, &ts))
3139 gfc_error ("Type of entity at %L is type incompatible with "
3140 "typespec", &tail->expr->where);
3144 /* Enforce F03:C627. */
3145 if (ts.kind != tail->expr->ts.kind)
3147 gfc_error ("Kind type parameter for entity at %L differs from "
3148 "the kind type parameter of the typespec",
3149 &tail->expr->where);
3154 if (tail->expr->ts.type == BT_DERIVED)
3155 tail->expr->ts.u.derived = gfc_use_derived (tail->expr->ts.u.derived);
3157 /* FIXME: disable the checking on derived types and arrays. */
3158 sym = tail->expr->symtree->n.sym;
3159 b1 = !(tail->expr->ref
3160 && (tail->expr->ref->type == REF_COMPONENT
3161 || tail->expr->ref->type == REF_ARRAY));
3162 if (sym && sym->ts.type == BT_CLASS && sym->attr.class_ok)
3163 b2 = !(CLASS_DATA (sym)->attr.allocatable
3164 || CLASS_DATA (sym)->attr.class_pointer);
3166 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3167 || sym->attr.proc_pointer);
3168 b3 = sym && sym->ns && sym->ns->proc_name
3169 && (sym->ns->proc_name->attr.allocatable
3170 || sym->ns->proc_name->attr.pointer
3171 || sym->ns->proc_name->attr.proc_pointer);
3172 if (b1 && b2 && !b3)
3174 gfc_error ("Allocate-object at %L is not a nonprocedure pointer "
3175 "or an allocatable variable", &tail->expr->where);
3179 if (gfc_peek_ascii_char () == '(' && !sym->attr.dimension)
3181 gfc_error ("Shape specification for allocatable scalar at %C");
3185 if (gfc_match_char (',') != MATCH_YES)
3190 m = gfc_match (" stat = %v", &tmp);
3191 if (m == MATCH_ERROR)
3198 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3206 if (gfc_check_do_variable (stat->symtree))
3209 if (gfc_match_char (',') == MATCH_YES)
3210 goto alloc_opt_list;
3213 m = gfc_match (" errmsg = %v", &tmp);
3214 if (m == MATCH_ERROR)
3218 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG tag at %L",
3219 &tmp->where) == FAILURE)
3225 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3233 if (gfc_match_char (',') == MATCH_YES)
3234 goto alloc_opt_list;
3237 m = gfc_match (" source = %e", &tmp);
3238 if (m == MATCH_ERROR)
3242 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: SOURCE tag at %L",
3243 &tmp->where) == FAILURE)
3249 gfc_error ("Redundant SOURCE tag found at %L ", &tmp->where);
3253 /* The next 2 conditionals check C631. */
3254 if (ts.type != BT_UNKNOWN)
3256 gfc_error ("SOURCE tag at %L conflicts with the typespec at %L",
3257 &tmp->where, &old_locus);
3263 gfc_error ("SOURCE tag at %L requires only a single entity in "
3264 "the allocation-list", &tmp->where);
3272 if (gfc_match_char (',') == MATCH_YES)
3273 goto alloc_opt_list;
3276 m = gfc_match (" mold = %e", &tmp);
3277 if (m == MATCH_ERROR)
3281 if (gfc_notify_std (GFC_STD_F2008, "Fortran 2008: MOLD tag at %L",
3282 &tmp->where) == FAILURE)
3285 /* Check F08:C636. */
3288 gfc_error ("Redundant MOLD tag found at %L ", &tmp->where);
3292 /* Check F08:C637. */
3293 if (ts.type != BT_UNKNOWN)
3295 gfc_error ("MOLD tag at %L conflicts with the typespec at %L",
3296 &tmp->where, &old_locus);
3305 if (gfc_match_char (',') == MATCH_YES)
3306 goto alloc_opt_list;
3309 gfc_gobble_whitespace ();
3311 if (gfc_peek_char () == ')')
3315 if (gfc_match (" )%t") != MATCH_YES)
3318 /* Check F08:C637. */
3321 gfc_error ("MOLD tag at %L conflicts with SOURCE tag at %L",
3322 &mold->where, &source->where);
3326 /* Check F03:C623, */
3327 if (saw_deferred && ts.type == BT_UNKNOWN && !source && !mold)
3329 gfc_error ("Allocate-object at %L with a deferred type parameter "
3330 "requires either a type-spec or SOURCE tag or a MOLD tag",
3335 new_st.op = EXEC_ALLOCATE;
3336 new_st.expr1 = stat;
3337 new_st.expr2 = errmsg;
3339 new_st.expr3 = source;
3341 new_st.expr3 = mold;
3342 new_st.ext.alloc.list = head;
3343 new_st.ext.alloc.ts = ts;
3348 gfc_syntax_error (ST_ALLOCATE);
3351 gfc_free_expr (errmsg);
3352 gfc_free_expr (source);
3353 gfc_free_expr (stat);
3354 gfc_free_expr (mold);
3355 if (tmp && tmp->expr_type) gfc_free_expr (tmp);
3356 gfc_free_alloc_list (head);
3361 /* Match a NULLIFY statement. A NULLIFY statement is transformed into
3362 a set of pointer assignments to intrinsic NULL(). */
3365 gfc_match_nullify (void)
3373 if (gfc_match_char ('(') != MATCH_YES)
3378 m = gfc_match_variable (&p, 0);
3379 if (m == MATCH_ERROR)
3384 if (gfc_check_do_variable (p->symtree))
3388 if (gfc_is_coindexed (p))
3390 gfc_error ("Pointer object at %C shall not be conindexed");
3394 /* build ' => NULL() '. */
3395 e = gfc_get_null_expr (&gfc_current_locus);
3397 /* Chain to list. */
3402 tail->next = gfc_get_code ();
3406 tail->op = EXEC_POINTER_ASSIGN;
3410 if (gfc_match (" )%t") == MATCH_YES)
3412 if (gfc_match_char (',') != MATCH_YES)
3419 gfc_syntax_error (ST_NULLIFY);
3422 gfc_free_statements (new_st.next);
3424 gfc_free_expr (new_st.expr1);
3425 new_st.expr1 = NULL;
3426 gfc_free_expr (new_st.expr2);
3427 new_st.expr2 = NULL;
3432 /* Match a DEALLOCATE statement. */
3435 gfc_match_deallocate (void)
3437 gfc_alloc *head, *tail;
3438 gfc_expr *stat, *errmsg, *tmp;
3441 bool saw_stat, saw_errmsg, b1, b2;
3444 stat = errmsg = tmp = NULL;
3445 saw_stat = saw_errmsg = false;
3447 if (gfc_match_char ('(') != MATCH_YES)
3453 head = tail = gfc_get_alloc ();
3456 tail->next = gfc_get_alloc ();
3460 m = gfc_match_variable (&tail->expr, 0);
3461 if (m == MATCH_ERROR)
3466 if (gfc_check_do_variable (tail->expr->symtree))
3469 sym = tail->expr->symtree->n.sym;
3471 if (gfc_pure (NULL) && gfc_impure_variable (sym))
3473 gfc_error ("Illegal allocate-object at %C for a PURE procedure");
3477 if (gfc_implicit_pure (NULL) && gfc_impure_variable (sym))
3478 gfc_current_ns->proc_name->attr.implicit_pure = 0;
3480 /* FIXME: disable the checking on derived types. */
3481 b1 = !(tail->expr->ref
3482 && (tail->expr->ref->type == REF_COMPONENT
3483 || tail->expr->ref->type == REF_ARRAY));
3484 if (sym && sym->ts.type == BT_CLASS)
3485 b2 = !(CLASS_DATA (sym)->attr.allocatable
3486 || CLASS_DATA (sym)->attr.class_pointer);
3488 b2 = sym && !(sym->attr.allocatable || sym->attr.pointer
3489 || sym->attr.proc_pointer);
3492 gfc_error ("Allocate-object at %C is not a nonprocedure pointer "
3493 "or an allocatable variable");
3497 if (gfc_match_char (',') != MATCH_YES)
3502 m = gfc_match (" stat = %v", &tmp);
3503 if (m == MATCH_ERROR)
3509 gfc_error ("Redundant STAT tag found at %L ", &tmp->where);
3510 gfc_free_expr (tmp);
3517 if (gfc_check_do_variable (stat->symtree))
3520 if (gfc_match_char (',') == MATCH_YES)
3521 goto dealloc_opt_list;
3524 m = gfc_match (" errmsg = %v", &tmp);
3525 if (m == MATCH_ERROR)
3529 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ERRMSG at %L",
3530 &tmp->where) == FAILURE)
3535 gfc_error ("Redundant ERRMSG tag found at %L ", &tmp->where);
3536 gfc_free_expr (tmp);
3543 if (gfc_match_char (',') == MATCH_YES)
3544 goto dealloc_opt_list;
3547 gfc_gobble_whitespace ();
3549 if (gfc_peek_char () == ')')
3553 if (gfc_match (" )%t") != MATCH_YES)
3556 new_st.op = EXEC_DEALLOCATE;
3557 new_st.expr1 = stat;
3558 new_st.expr2 = errmsg;
3559 new_st.ext.alloc.list = head;
3564 gfc_syntax_error (ST_DEALLOCATE);
3567 gfc_free_expr (errmsg);
3568 gfc_free_expr (stat);
3569 gfc_free_alloc_list (head);
3574 /* Match a RETURN statement. */
3577 gfc_match_return (void)
3581 gfc_compile_state s;
3585 if (gfc_find_state (COMP_CRITICAL) == SUCCESS)
3587 gfc_error ("Image control statement RETURN at %C in CRITICAL block");
3591 if (gfc_match_eos () == MATCH_YES)
3594 if (gfc_find_state (COMP_SUBROUTINE) == FAILURE)
3596 gfc_error ("Alternate RETURN statement at %C is only allowed within "
3601 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: Alternate RETURN "
3602 "at %C") == FAILURE)
3605 if (gfc_current_form == FORM_FREE)
3607 /* The following are valid, so we can't require a blank after the
3611 char c = gfc_peek_ascii_char ();
3612 if (ISALPHA (c) || ISDIGIT (c))
3616 m = gfc_match (" %e%t", &e);
3619 if (m == MATCH_ERROR)
3622 gfc_syntax_error (ST_RETURN);
3629 gfc_enclosing_unit (&s);
3630 if (s == COMP_PROGRAM
3631 && gfc_notify_std (GFC_STD_GNU, "Extension: RETURN statement in "
3632 "main program at %C") == FAILURE)
3635 new_st.op = EXEC_RETURN;
3642 /* Match the call of a type-bound procedure, if CALL%var has already been
3643 matched and var found to be a derived-type variable. */
3646 match_typebound_call (gfc_symtree* varst)
3651 base = gfc_get_expr ();
3652 base->expr_type = EXPR_VARIABLE;
3653 base->symtree = varst;
3654 base->where = gfc_current_locus;
3655 gfc_set_sym_referenced (varst->n.sym);
3657 m = gfc_match_varspec (base, 0, true, true);
3659 gfc_error ("Expected component reference at %C");
3663 if (gfc_match_eos () != MATCH_YES)
3665 gfc_error ("Junk after CALL at %C");
3669 if (base->expr_type == EXPR_COMPCALL)
3670 new_st.op = EXEC_COMPCALL;
3671 else if (base->expr_type == EXPR_PPC)
3672 new_st.op = EXEC_CALL_PPC;
3675 gfc_error ("Expected type-bound procedure or procedure pointer component "
3679 new_st.expr1 = base;
3685 /* Match a CALL statement. The tricky part here are possible
3686 alternate return specifiers. We handle these by having all
3687 "subroutines" actually return an integer via a register that gives
3688 the return number. If the call specifies alternate returns, we
3689 generate code for a SELECT statement whose case clauses contain
3690 GOTOs to the various labels. */
3693 gfc_match_call (void)
3695 char name[GFC_MAX_SYMBOL_LEN + 1];
3696 gfc_actual_arglist *a, *arglist;
3706 m = gfc_match ("% %n", name);
3712 if (gfc_get_ha_sym_tree (name, &st))
3717 /* If this is a variable of derived-type, it probably starts a type-bound
3719 if ((sym->attr.flavor != FL_PROCEDURE
3720 || gfc_is_function_return_value (sym, gfc_current_ns))
3721 && (sym->ts.type == BT_DERIVED || sym->ts.type == BT_CLASS))
3722 return match_typebound_call (st);
3724 /* If it does not seem to be callable (include functions so that the
3725 right association is made. They are thrown out in resolution.)
3727 if (!sym->attr.generic
3728 && !sym->attr.subroutine
3729 && !sym->attr.function)
3731 if (!(sym->attr.external && !sym->attr.referenced))
3733 /* ...create a symbol in this scope... */
3734 if (sym->ns != gfc_current_ns
3735 && gfc_get_sym_tree (name, NULL, &st, false) == 1)
3738 if (sym != st->n.sym)
3742 /* ...and then to try to make the symbol into a subroutine. */
3743 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
3747 gfc_set_sym_referenced (sym);
3749 if (gfc_match_eos () != MATCH_YES)
3751 m = gfc_match_actual_arglist (1, &arglist);
3754 if (m == MATCH_ERROR)
3757 if (gfc_match_eos () != MATCH_YES)
3761 /* If any alternate return labels were found, construct a SELECT
3762 statement that will jump to the right place. */
3765 for (a = arglist; a; a = a->next)
3766 if (a->expr == NULL)
3771 gfc_symtree *select_st;
3772 gfc_symbol *select_sym;
3773 char name[GFC_MAX_SYMBOL_LEN + 1];
3775 new_st.next = c = gfc_get_code ();
3776 c->op = EXEC_SELECT;
3777 sprintf (name, "_result_%s", sym->name);
3778 gfc_get_ha_sym_tree (name, &select_st); /* Can't fail. */
3780 select_sym = select_st->n.sym;
3781 select_sym->ts.type = BT_INTEGER;
3782 select_sym->ts.kind = gfc_default_integer_kind;
3783 gfc_set_sym_referenced (select_sym);
3784 c->expr1 = gfc_get_expr ();
3785 c->expr1->expr_type = EXPR_VARIABLE;
3786 c->expr1->symtree = select_st;
3787 c->expr1->ts = select_sym->ts;
3788 c->expr1->where = gfc_current_locus;
3791 for (a = arglist; a; a = a->next)
3793 if (a->expr != NULL)
3796 if (gfc_reference_st_label (a->label, ST_LABEL_TARGET) == FAILURE)
3801 c->block = gfc_get_code ();
3803 c->op = EXEC_SELECT;
3805 new_case = gfc_get_case ();
3806 new_case->high = gfc_get_int_expr (gfc_default_integer_kind, NULL, i);
3807 new_case->low = new_case->high;
3808 c->ext.block.case_list = new_case;
3810 c->next = gfc_get_code ();
3811 c->next->op = EXEC_GOTO;
3812 c->next->label1 = a->label;
3816 new_st.op = EXEC_CALL;
3817 new_st.symtree = st;
3818 new_st.ext.actual = arglist;
3823 gfc_syntax_error (ST_CALL);
3826 gfc_free_actual_arglist (arglist);
3831 /* Given a name, return a pointer to the common head structure,
3832 creating it if it does not exist. If FROM_MODULE is nonzero, we
3833 mangle the name so that it doesn't interfere with commons defined
3834 in the using namespace.
3835 TODO: Add to global symbol tree. */
3838 gfc_get_common (const char *name, int from_module)
3841 static int serial = 0;
3842 char mangled_name[GFC_MAX_SYMBOL_LEN + 1];
3846 /* A use associated common block is only needed to correctly layout
3847 the variables it contains. */
3848 snprintf (mangled_name, GFC_MAX_SYMBOL_LEN, "_%d_%s", serial++, name);
3849 st = gfc_new_symtree (&gfc_current_ns->common_root, mangled_name);
3853 st = gfc_find_symtree (gfc_current_ns->common_root, name);
3856 st = gfc_new_symtree (&gfc_current_ns->common_root, name);
3859 if (st->n.common == NULL)
3861 st->n.common = gfc_get_common_head ();
3862 st->n.common->where = gfc_current_locus;
3863 strcpy (st->n.common->name, name);
3866 return st->n.common;
3870 /* Match a common block name. */
3872 match match_common_name (char *name)
3876 if (gfc_match_char ('/') == MATCH_NO)
3882 if (gfc_match_char ('/') == MATCH_YES)
3888 m = gfc_match_name (name);
3890 if (m == MATCH_ERROR)
3892 if (m == MATCH_YES && gfc_match_char ('/') == MATCH_YES)
3895 gfc_error ("Syntax error in common block name at %C");
3900 /* Match a COMMON statement. */
3903 gfc_match_common (void)
3905 gfc_symbol *sym, **head, *tail, *other, *old_blank_common;
3906 char name[GFC_MAX_SYMBOL_LEN + 1];
3913 old_blank_common = gfc_current_ns->blank_common.head;
3914 if (old_blank_common)
3916 while (old_blank_common->common_next)
3917 old_blank_common = old_blank_common->common_next;
3924 m = match_common_name (name);
3925 if (m == MATCH_ERROR)
3928 gsym = gfc_get_gsymbol (name);
3929 if (gsym->type != GSYM_UNKNOWN && gsym->type != GSYM_COMMON)
3931 gfc_error ("Symbol '%s' at %C is already an external symbol that "
3932 "is not COMMON", name);
3936 if (gsym->type == GSYM_UNKNOWN)
3938 gsym->type = GSYM_COMMON;
3939 gsym->where = gfc_current_locus;
3945 if (name[0] == '\0')
3947 t = &gfc_current_ns->blank_common;
3948 if (t->head == NULL)
3949 t->where = gfc_current_locus;
3953 t = gfc_get_common (name, 0);
3962 while (tail->common_next)
3963 tail = tail->common_next;
3966 /* Grab the list of symbols. */
3969 m = gfc_match_symbol (&sym, 0);
3970 if (m == MATCH_ERROR)
3975 /* Store a ref to the common block for error checking. */
3976 sym->common_block = t;
3978 /* See if we know the current common block is bind(c), and if
3979 so, then see if we can check if the symbol is (which it'll
3980 need to be). This can happen if the bind(c) attr stmt was
3981 applied to the common block, and the variable(s) already
3982 defined, before declaring the common block. */
3983 if (t->is_bind_c == 1)
3985 if (sym->ts.type != BT_UNKNOWN && sym->ts.is_c_interop != 1)
3987 /* If we find an error, just print it and continue,
3988 cause it's just semantic, and we can see if there
3990 gfc_error_now ("Variable '%s' at %L in common block '%s' "
3991 "at %C must be declared with a C "
3992 "interoperable kind since common block "
3994 sym->name, &(sym->declared_at), t->name,
3998 if (sym->attr.is_bind_c == 1)
3999 gfc_error_now ("Variable '%s' in common block "
4000 "'%s' at %C can not be bind(c) since "
4001 "it is not global", sym->name, t->name);
4004 if (sym->attr.in_common)
4006 gfc_error ("Symbol '%s' at %C is already in a COMMON block",
4011 if (((sym->value != NULL && sym->value->expr_type != EXPR_NULL)
4012 || sym->attr.data) && gfc_current_state () != COMP_BLOCK_DATA)
4014 if (gfc_notify_std (GFC_STD_GNU, "Initialized symbol '%s' at %C "
4015 "can only be COMMON in "
4016 "BLOCK DATA", sym->name)
4021 if (gfc_add_in_common (&sym->attr, sym->name, NULL) == FAILURE)
4025 tail->common_next = sym;
4031 /* Deal with an optional array specification after the
4033 m = gfc_match_array_spec (&as, true, true);
4034 if (m == MATCH_ERROR)
4039 if (as->type != AS_EXPLICIT)
4041 gfc_error ("Array specification for symbol '%s' in COMMON "
4042 "at %C must be explicit", sym->name);
4046 if (gfc_add_dimension (&sym->attr, sym->name, NULL) == FAILURE)
4049 if (sym->attr.pointer)
4051 gfc_error ("Symbol '%s' in COMMON at %C cannot be a "
4052 "POINTER array", sym->name);
4061 sym->common_head = t;
4063 /* Check to see if the symbol is already in an equivalence group.
4064 If it is, set the other members as being in common. */
4065 if (sym->attr.in_equivalence)
4067 for (e1 = gfc_current_ns->equiv; e1; e1 = e1->next)
4069 for (e2 = e1; e2; e2 = e2->eq)
4070 if (e2->expr->symtree->n.sym == sym)
4077 for (e2 = e1; e2; e2 = e2->eq)
4079 other = e2->expr->symtree->n.sym;
4080 if (other->common_head
4081 && other->common_head != sym->common_head)
4083 gfc_error ("Symbol '%s', in COMMON block '%s' at "
4084 "%C is being indirectly equivalenced to "
4085 "another COMMON block '%s'",
4086 sym->name, sym->common_head->name,
4087 other->common_head->name);
4090 other->attr.in_common = 1;
4091 other->common_head = t;
4097 gfc_gobble_whitespace ();
4098 if (gfc_match_eos () == MATCH_YES)
4100 if (gfc_peek_ascii_char () == '/')
4102 if (gfc_match_char (',') != MATCH_YES)
4104 gfc_gobble_whitespace ();
4105 if (gfc_peek_ascii_char () == '/')
4114 gfc_syntax_error (ST_COMMON);
4117 if (old_blank_common)
4118 old_blank_common->common_next = NULL;
4120 gfc_current_ns->blank_common.head = NULL;
4121 gfc_free_array_spec (as);
4126 /* Match a BLOCK DATA program unit. */
4129 gfc_match_block_data (void)
4131 char name[GFC_MAX_SYMBOL_LEN + 1];
4135 if (gfc_match_eos () == MATCH_YES)
4137 gfc_new_block = NULL;
4141 m = gfc_match ("% %n%t", name);
4145 if (gfc_get_symbol (name, NULL, &sym))
4148 if (gfc_add_flavor (&sym->attr, FL_BLOCK_DATA, sym->name, NULL) == FAILURE)
4151 gfc_new_block = sym;
4157 /* Free a namelist structure. */
4160 gfc_free_namelist (gfc_namelist *name)
4164 for (; name; name = n)
4172 /* Match a NAMELIST statement. */
4175 gfc_match_namelist (void)
4177 gfc_symbol *group_name, *sym;
4181 m = gfc_match (" / %s /", &group_name);
4184 if (m == MATCH_ERROR)
4189 if (group_name->ts.type != BT_UNKNOWN)
4191 gfc_error ("Namelist group name '%s' at %C already has a basic "
4192 "type of %s", group_name->name,
4193 gfc_typename (&group_name->ts));
4197 if (group_name->attr.flavor == FL_NAMELIST
4198 && group_name->attr.use_assoc
4199 && gfc_notify_std (GFC_STD_GNU, "Namelist group name '%s' "
4200 "at %C already is USE associated and can"
4201 "not be respecified.", group_name->name)
4205 if (group_name->attr.flavor != FL_NAMELIST
4206 && gfc_add_flavor (&group_name->attr, FL_NAMELIST,
4207 group_name->name, NULL) == FAILURE)
4212 m = gfc_match_symbol (&sym, 1);
4215 if (m == MATCH_ERROR)
4218 if (sym->attr.in_namelist == 0
4219 && gfc_add_in_namelist (&sym->attr, sym->name, NULL) == FAILURE)
4222 /* Use gfc_error_check here, rather than goto error, so that
4223 these are the only errors for the next two lines. */
4224 if (sym->as && sym->as->type == AS_ASSUMED_SIZE)
4226 gfc_error ("Assumed size array '%s' in namelist '%s' at "
4227 "%C is not allowed", sym->name, group_name->name);
4231 nl = gfc_get_namelist ();
4235 if (group_name->namelist == NULL)
4236 group_name->namelist = group_name->namelist_tail = nl;
4239 group_name->namelist_tail->next = nl;
4240 group_name->namelist_tail = nl;
4243 if (gfc_match_eos () == MATCH_YES)
4246 m = gfc_match_char (',');
4248 if (gfc_match_char ('/') == MATCH_YES)
4250 m2 = gfc_match (" %s /", &group_name);
4251 if (m2 == MATCH_YES)
4253 if (m2 == MATCH_ERROR)
4267 gfc_syntax_error (ST_NAMELIST);
4274 /* Match a MODULE statement. */
4277 gfc_match_module (void)
4281 m = gfc_match (" %s%t", &gfc_new_block);
4285 if (gfc_add_flavor (&gfc_new_block->attr, FL_MODULE,
4286 gfc_new_block->name, NULL) == FAILURE)
4293 /* Free equivalence sets and lists. Recursively is the easiest way to
4297 gfc_free_equiv_until (gfc_equiv *eq, gfc_equiv *stop)
4302 gfc_free_equiv (eq->eq);
4303 gfc_free_equiv_until (eq->next, stop);
4304 gfc_free_expr (eq->expr);
4310 gfc_free_equiv (gfc_equiv *eq)
4312 gfc_free_equiv_until (eq, NULL);
4316 /* Match an EQUIVALENCE statement. */
4319 gfc_match_equivalence (void)
4321 gfc_equiv *eq, *set, *tail;
4325 gfc_common_head *common_head = NULL;
4333 eq = gfc_get_equiv ();
4337 eq->next = gfc_current_ns->equiv;
4338 gfc_current_ns->equiv = eq;
4340 if (gfc_match_char ('(') != MATCH_YES)
4344 common_flag = FALSE;
4349 m = gfc_match_equiv_variable (&set->expr);
4350 if (m == MATCH_ERROR)
4355 /* count the number of objects. */
4358 if (gfc_match_char ('%') == MATCH_YES)
4360 gfc_error ("Derived type component %C is not a "
4361 "permitted EQUIVALENCE member");
4365 for (ref = set->expr->ref; ref; ref = ref->next)
4366 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
4368 gfc_error ("Array reference in EQUIVALENCE at %C cannot "
4369 "be an array section");
4373 sym = set->expr->symtree->n.sym;
4375 if (gfc_add_in_equivalence (&sym->attr, sym->name, NULL) == FAILURE)
4378 if (sym->attr.in_common)
4381 common_head = sym->common_head;
4384 if (gfc_match_char (')') == MATCH_YES)
4387 if (gfc_match_char (',') != MATCH_YES)
4390 set->eq = gfc_get_equiv ();
4396 gfc_error ("EQUIVALENCE at %C requires two or more objects");
4400 /* If one of the members of an equivalence is in common, then
4401 mark them all as being in common. Before doing this, check
4402 that members of the equivalence group are not in different
4405 for (set = eq; set; set = set->eq)
4407 sym = set->expr->symtree->n.sym;
4408 if (sym->common_head && sym->common_head != common_head)
4410 gfc_error ("Attempt to indirectly overlap COMMON "
4411 "blocks %s and %s by EQUIVALENCE at %C",
4412 sym->common_head->name, common_head->name);
4415 sym->attr.in_common = 1;
4416 sym->common_head = common_head;
4419 if (gfc_match_eos () == MATCH_YES)
4421 if (gfc_match_char (',') != MATCH_YES)
4423 gfc_error ("Expecting a comma in EQUIVALENCE at %C");
4431 gfc_syntax_error (ST_EQUIVALENCE);
4437 gfc_free_equiv (gfc_current_ns->equiv);
4438 gfc_current_ns->equiv = eq;
4444 /* Check that a statement function is not recursive. This is done by looking
4445 for the statement function symbol(sym) by looking recursively through its
4446 expression(e). If a reference to sym is found, true is returned.
4447 12.5.4 requires that any variable of function that is implicitly typed
4448 shall have that type confirmed by any subsequent type declaration. The
4449 implicit typing is conveniently done here. */
4451 recursive_stmt_fcn (gfc_expr *, gfc_symbol *);
4454 check_stmt_fcn (gfc_expr *e, gfc_symbol *sym, int *f ATTRIBUTE_UNUSED)
4460 switch (e->expr_type)
4463 if (e->symtree == NULL)
4466 /* Check the name before testing for nested recursion! */
4467 if (sym->name == e->symtree->n.sym->name)
4470 /* Catch recursion via other statement functions. */
4471 if (e->symtree->n.sym->attr.proc == PROC_ST_FUNCTION
4472 && e->symtree->n.sym->value
4473 && recursive_stmt_fcn (e->symtree->n.sym->value, sym))
4476 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4477 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4482 if (e->symtree && sym->name == e->symtree->n.sym->name)
4485 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
4486 gfc_set_default_type (e->symtree->n.sym, 0, NULL);
4498 recursive_stmt_fcn (gfc_expr *e, gfc_symbol *sym)
4500 return gfc_traverse_expr (e, sym, check_stmt_fcn, 0);
4504 /* Match a statement function declaration. It is so easy to match
4505 non-statement function statements with a MATCH_ERROR as opposed to
4506 MATCH_NO that we suppress error message in most cases. */
4509 gfc_match_st_function (void)
4511 gfc_error_buf old_error;
4516 m = gfc_match_symbol (&sym, 0);
4520 gfc_push_error (&old_error);
4522 if (gfc_add_procedure (&sym->attr, PROC_ST_FUNCTION,
4523 sym->name, NULL) == FAILURE)
4526 if (gfc_match_formal_arglist (sym, 1, 0) != MATCH_YES)
4529 m = gfc_match (" = %e%t", &expr);
4533 gfc_free_error (&old_error);
4534 if (m == MATCH_ERROR)
4537 if (recursive_stmt_fcn (expr, sym))
4539 gfc_error ("Statement function at %L is recursive", &expr->where);
4545 if (gfc_notify_std (GFC_STD_F95_OBS, "Obsolescent feature: "
4546 "Statement function at %C") == FAILURE)
4552 gfc_pop_error (&old_error);
4557 /***************** SELECT CASE subroutines ******************/
4559 /* Free a single case structure. */
4562 free_case (gfc_case *p)
4564 if (p->low == p->high)
4566 gfc_free_expr (p->low);
4567 gfc_free_expr (p->high);
4572 /* Free a list of case structures. */
4575 gfc_free_case_list (gfc_case *p)
4587 /* Match a single case selector. */
4590 match_case_selector (gfc_case **cp)
4595 c = gfc_get_case ();
4596 c->where = gfc_current_locus;
4598 if (gfc_match_char (':') == MATCH_YES)
4600 m = gfc_match_init_expr (&c->high);
4603 if (m == MATCH_ERROR)
4608 m = gfc_match_init_expr (&c->low);
4609 if (m == MATCH_ERROR)
4614 /* If we're not looking at a ':' now, make a range out of a single
4615 target. Else get the upper bound for the case range. */
4616 if (gfc_match_char (':') != MATCH_YES)
4620 m = gfc_match_init_expr (&c->high);
4621 if (m == MATCH_ERROR)
4623 /* MATCH_NO is fine. It's OK if nothing is there! */
4631 gfc_error ("Expected initialization expression in CASE at %C");
4639 /* Match the end of a case statement. */
4642 match_case_eos (void)
4644 char name[GFC_MAX_SYMBOL_LEN + 1];
4647 if (gfc_match_eos () == MATCH_YES)
4650 /* If the case construct doesn't have a case-construct-name, we
4651 should have matched the EOS. */
4652 if (!gfc_current_block ())
4655 gfc_gobble_whitespace ();
4657 m = gfc_match_name (name);
4661 if (strcmp (name, gfc_current_block ()->name) != 0)
4663 gfc_error ("Expected block name '%s' of SELECT construct at %C",
4664 gfc_current_block ()->name);
4668 return gfc_match_eos ();
4672 /* Match a SELECT statement. */
4675 gfc_match_select (void)
4680 m = gfc_match_label ();
4681 if (m == MATCH_ERROR)
4684 m = gfc_match (" select case ( %e )%t", &expr);
4688 new_st.op = EXEC_SELECT;
4689 new_st.expr1 = expr;
4695 /* Push the current selector onto the SELECT TYPE stack. */
4698 select_type_push (gfc_symbol *sel)
4700 gfc_select_type_stack *top = gfc_get_select_type_stack ();
4701 top->selector = sel;
4703 top->prev = select_type_stack;
4705 select_type_stack = top;
4709 /* Set the temporary for the current SELECT TYPE selector. */
4712 select_type_set_tmp (gfc_typespec *ts)
4714 char name[GFC_MAX_SYMBOL_LEN];
4719 select_type_stack->tmp = NULL;
4723 if (!gfc_type_is_extensible (ts->u.derived))
4726 if (ts->type == BT_CLASS)
4727 sprintf (name, "__tmp_class_%s", ts->u.derived->name);
4729 sprintf (name, "__tmp_type_%s", ts->u.derived->name);
4730 gfc_get_sym_tree (name, gfc_current_ns, &tmp, false);
4731 gfc_add_type (tmp->n.sym, ts, NULL);
4732 gfc_set_sym_referenced (tmp->n.sym);
4733 if (select_type_stack->selector->ts.type == BT_CLASS &&
4734 CLASS_DATA (select_type_stack->selector)->attr.allocatable)
4735 gfc_add_allocatable (&tmp->n.sym->attr, NULL);
4737 gfc_add_pointer (&tmp->n.sym->attr, NULL);
4738 gfc_add_flavor (&tmp->n.sym->attr, FL_VARIABLE, name, NULL);
4739 if (ts->type == BT_CLASS)
4740 gfc_build_class_symbol (&tmp->n.sym->ts, &tmp->n.sym->attr,
4741 &tmp->n.sym->as, false);
4742 tmp->n.sym->attr.select_type_temporary = 1;
4744 /* Add an association for it, so the rest of the parser knows it is
4745 an associate-name. The target will be set during resolution. */
4746 tmp->n.sym->assoc = gfc_get_association_list ();
4747 tmp->n.sym->assoc->dangling = 1;
4748 tmp->n.sym->assoc->st = tmp;
4750 select_type_stack->tmp = tmp;
4754 /* Match a SELECT TYPE statement. */
4757 gfc_match_select_type (void)
4759 gfc_expr *expr1, *expr2 = NULL;
4761 char name[GFC_MAX_SYMBOL_LEN];
4763 m = gfc_match_label ();
4764 if (m == MATCH_ERROR)
4767 m = gfc_match (" select type ( ");
4771 gfc_current_ns = gfc_build_block_ns (gfc_current_ns);
4773 m = gfc_match (" %n => %e", name, &expr2);
4776 expr1 = gfc_get_expr();
4777 expr1->expr_type = EXPR_VARIABLE;
4778 if (gfc_get_sym_tree (name, NULL, &expr1->symtree, false))
4783 if (expr2->ts.type == BT_UNKNOWN)
4784 expr1->symtree->n.sym->attr.untyped = 1;
4786 expr1->symtree->n.sym->ts = expr2->ts;
4787 expr1->symtree->n.sym->attr.flavor = FL_VARIABLE;
4788 expr1->symtree->n.sym->attr.referenced = 1;
4789 expr1->symtree->n.sym->attr.class_ok = 1;
4793 m = gfc_match (" %e ", &expr1);
4798 m = gfc_match (" )%t");
4802 /* Check for F03:C811. */
4803 if (!expr2 && (expr1->expr_type != EXPR_VARIABLE || expr1->ref != NULL))
4805 gfc_error ("Selector in SELECT TYPE at %C is not a named variable; "
4806 "use associate-name=>");
4811 new_st.op = EXEC_SELECT_TYPE;
4812 new_st.expr1 = expr1;
4813 new_st.expr2 = expr2;
4814 new_st.ext.block.ns = gfc_current_ns;
4816 select_type_push (expr1->symtree->n.sym);
4821 gfc_current_ns = gfc_current_ns->parent;
4826 /* Match a CASE statement. */
4829 gfc_match_case (void)
4831 gfc_case *c, *head, *tail;
4836 if (gfc_current_state () != COMP_SELECT)
4838 gfc_error ("Unexpected CASE statement at %C");
4842 if (gfc_match ("% default") == MATCH_YES)
4844 m = match_case_eos ();
4847 if (m == MATCH_ERROR)
4850 new_st.op = EXEC_SELECT;
4851 c = gfc_get_case ();
4852 c->where = gfc_current_locus;
4853 new_st.ext.block.case_list = c;
4857 if (gfc_match_char ('(') != MATCH_YES)
4862 if (match_case_selector (&c) == MATCH_ERROR)
4872 if (gfc_match_char (')') == MATCH_YES)
4874 if (gfc_match_char (',') != MATCH_YES)
4878 m = match_case_eos ();
4881 if (m == MATCH_ERROR)
4884 new_st.op = EXEC_SELECT;
4885 new_st.ext.block.case_list = head;
4890 gfc_error ("Syntax error in CASE specification at %C");
4893 gfc_free_case_list (head); /* new_st is cleaned up in parse.c. */
4898 /* Match a TYPE IS statement. */
4901 gfc_match_type_is (void)
4906 if (gfc_current_state () != COMP_SELECT_TYPE)
4908 gfc_error ("Unexpected TYPE IS statement at %C");
4912 if (gfc_match_char ('(') != MATCH_YES)
4915 c = gfc_get_case ();
4916 c->where = gfc_current_locus;
4918 /* TODO: Once unlimited polymorphism is implemented, we will need to call
4919 match_type_spec here. */
4920 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4923 if (gfc_match_char (')') != MATCH_YES)
4926 m = match_case_eos ();
4929 if (m == MATCH_ERROR)
4932 new_st.op = EXEC_SELECT_TYPE;
4933 new_st.ext.block.case_list = c;
4935 /* Create temporary variable. */
4936 select_type_set_tmp (&c->ts);
4941 gfc_error ("Syntax error in TYPE IS specification at %C");
4945 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
4950 /* Match a CLASS IS or CLASS DEFAULT statement. */
4953 gfc_match_class_is (void)
4958 if (gfc_current_state () != COMP_SELECT_TYPE)
4961 if (gfc_match ("% default") == MATCH_YES)
4963 m = match_case_eos ();
4966 if (m == MATCH_ERROR)
4969 new_st.op = EXEC_SELECT_TYPE;
4970 c = gfc_get_case ();
4971 c->where = gfc_current_locus;
4972 c->ts.type = BT_UNKNOWN;
4973 new_st.ext.block.case_list = c;
4974 select_type_set_tmp (NULL);
4978 m = gfc_match ("% is");
4981 if (m == MATCH_ERROR)
4984 if (gfc_match_char ('(') != MATCH_YES)
4987 c = gfc_get_case ();
4988 c->where = gfc_current_locus;
4990 if (match_derived_type_spec (&c->ts) == MATCH_ERROR)
4993 if (c->ts.type == BT_DERIVED)
4994 c->ts.type = BT_CLASS;
4996 if (gfc_match_char (')') != MATCH_YES)
4999 m = match_case_eos ();
5002 if (m == MATCH_ERROR)
5005 new_st.op = EXEC_SELECT_TYPE;
5006 new_st.ext.block.case_list = c;
5008 /* Create temporary variable. */
5009 select_type_set_tmp (&c->ts);
5014 gfc_error ("Syntax error in CLASS IS specification at %C");
5018 gfc_free_case_list (c); /* new_st is cleaned up in parse.c. */
5023 /********************* WHERE subroutines ********************/
5025 /* Match the rest of a simple WHERE statement that follows an IF statement.
5029 match_simple_where (void)
5035 m = gfc_match (" ( %e )", &expr);
5039 m = gfc_match_assignment ();
5042 if (m == MATCH_ERROR)
5045 if (gfc_match_eos () != MATCH_YES)
5048 c = gfc_get_code ();
5052 c->next = gfc_get_code ();
5055 gfc_clear_new_st ();
5057 new_st.op = EXEC_WHERE;
5063 gfc_syntax_error (ST_WHERE);
5066 gfc_free_expr (expr);
5071 /* Match a WHERE statement. */
5074 gfc_match_where (gfc_statement *st)
5080 m0 = gfc_match_label ();
5081 if (m0 == MATCH_ERROR)
5084 m = gfc_match (" where ( %e )", &expr);
5088 if (gfc_match_eos () == MATCH_YES)
5090 *st = ST_WHERE_BLOCK;
5091 new_st.op = EXEC_WHERE;
5092 new_st.expr1 = expr;
5096 m = gfc_match_assignment ();
5098 gfc_syntax_error (ST_WHERE);
5102 gfc_free_expr (expr);
5106 /* We've got a simple WHERE statement. */
5108 c = gfc_get_code ();
5112 c->next = gfc_get_code ();
5115 gfc_clear_new_st ();
5117 new_st.op = EXEC_WHERE;
5124 /* Match an ELSEWHERE statement. We leave behind a WHERE node in
5125 new_st if successful. */
5128 gfc_match_elsewhere (void)
5130 char name[GFC_MAX_SYMBOL_LEN + 1];
5134 if (gfc_current_state () != COMP_WHERE)
5136 gfc_error ("ELSEWHERE statement at %C not enclosed in WHERE block");
5142 if (gfc_match_char ('(') == MATCH_YES)
5144 m = gfc_match_expr (&expr);
5147 if (m == MATCH_ERROR)
5150 if (gfc_match_char (')') != MATCH_YES)
5154 if (gfc_match_eos () != MATCH_YES)
5156 /* Only makes sense if we have a where-construct-name. */
5157 if (!gfc_current_block ())
5162 /* Better be a name at this point. */
5163 m = gfc_match_name (name);
5166 if (m == MATCH_ERROR)
5169 if (gfc_match_eos () != MATCH_YES)
5172 if (strcmp (name, gfc_current_block ()->name) != 0)
5174 gfc_error ("Label '%s' at %C doesn't match WHERE label '%s'",
5175 name, gfc_current_block ()->name);
5180 new_st.op = EXEC_WHERE;
5181 new_st.expr1 = expr;
5185 gfc_syntax_error (ST_ELSEWHERE);
5188 gfc_free_expr (expr);
5193 /******************** FORALL subroutines ********************/
5195 /* Free a list of FORALL iterators. */
5198 gfc_free_forall_iterator (gfc_forall_iterator *iter)
5200 gfc_forall_iterator *next;
5205 gfc_free_expr (iter->var);
5206 gfc_free_expr (iter->start);
5207 gfc_free_expr (iter->end);
5208 gfc_free_expr (iter->stride);
5215 /* Match an iterator as part of a FORALL statement. The format is:
5217 <var> = <start>:<end>[:<stride>]
5219 On MATCH_NO, the caller tests for the possibility that there is a
5220 scalar mask expression. */
5223 match_forall_iterator (gfc_forall_iterator **result)
5225 gfc_forall_iterator *iter;
5229 where = gfc_current_locus;
5230 iter = XCNEW (gfc_forall_iterator);
5232 m = gfc_match_expr (&iter->var);
5236 if (gfc_match_char ('=') != MATCH_YES
5237 || iter->var->expr_type != EXPR_VARIABLE)
5243 m = gfc_match_expr (&iter->start);
5247 if (gfc_match_char (':') != MATCH_YES)
5250 m = gfc_match_expr (&iter->end);
5253 if (m == MATCH_ERROR)
5256 if (gfc_match_char (':') == MATCH_NO)
5257 iter->stride = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
5260 m = gfc_match_expr (&iter->stride);
5263 if (m == MATCH_ERROR)
5267 /* Mark the iteration variable's symbol as used as a FORALL index. */
5268 iter->var->symtree->n.sym->forall_index = true;
5274 gfc_error ("Syntax error in FORALL iterator at %C");
5279 gfc_current_locus = where;
5280 gfc_free_forall_iterator (iter);
5285 /* Match the header of a FORALL statement. */
5288 match_forall_header (gfc_forall_iterator **phead, gfc_expr **mask)
5290 gfc_forall_iterator *head, *tail, *new_iter;
5294 gfc_gobble_whitespace ();
5299 if (gfc_match_char ('(') != MATCH_YES)
5302 m = match_forall_iterator (&new_iter);
5303 if (m == MATCH_ERROR)
5308 head = tail = new_iter;
5312 if (gfc_match_char (',') != MATCH_YES)
5315 m = match_forall_iterator (&new_iter);
5316 if (m == MATCH_ERROR)
5321 tail->next = new_iter;
5326 /* Have to have a mask expression. */
5328 m = gfc_match_expr (&msk);
5331 if (m == MATCH_ERROR)
5337 if (gfc_match_char (')') == MATCH_NO)
5345 gfc_syntax_error (ST_FORALL);
5348 gfc_free_expr (msk);
5349 gfc_free_forall_iterator (head);
5354 /* Match the rest of a simple FORALL statement that follows an
5358 match_simple_forall (void)
5360 gfc_forall_iterator *head;
5369 m = match_forall_header (&head, &mask);
5376 m = gfc_match_assignment ();
5378 if (m == MATCH_ERROR)
5382 m = gfc_match_pointer_assignment ();
5383 if (m == MATCH_ERROR)
5389 c = gfc_get_code ();
5391 c->loc = gfc_current_locus;
5393 if (gfc_match_eos () != MATCH_YES)
5396 gfc_clear_new_st ();
5397 new_st.op = EXEC_FORALL;
5398 new_st.expr1 = mask;
5399 new_st.ext.forall_iterator = head;
5400 new_st.block = gfc_get_code ();
5402 new_st.block->op = EXEC_FORALL;
5403 new_st.block->next = c;
5408 gfc_syntax_error (ST_FORALL);
5411 gfc_free_forall_iterator (head);
5412 gfc_free_expr (mask);
5418 /* Match a FORALL statement. */
5421 gfc_match_forall (gfc_statement *st)
5423 gfc_forall_iterator *head;
5432 m0 = gfc_match_label ();
5433 if (m0 == MATCH_ERROR)
5436 m = gfc_match (" forall");
5440 m = match_forall_header (&head, &mask);
5441 if (m == MATCH_ERROR)
5446 if (gfc_match_eos () == MATCH_YES)
5448 *st = ST_FORALL_BLOCK;
5449 new_st.op = EXEC_FORALL;
5450 new_st.expr1 = mask;
5451 new_st.ext.forall_iterator = head;
5455 m = gfc_match_assignment ();
5456 if (m == MATCH_ERROR)
5460 m = gfc_match_pointer_assignment ();
5461 if (m == MATCH_ERROR)
5467 c = gfc_get_code ();
5469 c->loc = gfc_current_locus;
5471 gfc_clear_new_st ();
5472 new_st.op = EXEC_FORALL;
5473 new_st.expr1 = mask;
5474 new_st.ext.forall_iterator = head;
5475 new_st.block = gfc_get_code ();
5476 new_st.block->op = EXEC_FORALL;
5477 new_st.block->next = c;
5483 gfc_syntax_error (ST_FORALL);
5486 gfc_free_forall_iterator (head);
5487 gfc_free_expr (mask);
5488 gfc_free_statements (c);