1 /* Declaration statement matcher
2 Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
4 Contributed by Andy Vaught
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
29 /* Macros to access allocate memory for gfc_data_variable,
30 gfc_data_value and gfc_data. */
31 #define gfc_get_data_variable() gfc_getmem (sizeof (gfc_data_variable))
32 #define gfc_get_data_value() gfc_getmem (sizeof (gfc_data_value))
33 #define gfc_get_data() gfc_getmem( sizeof (gfc_data))
36 /* This flag is set if an old-style length selector is matched
37 during a type-declaration statement. */
39 static int old_char_selector;
41 /* When variables acquire types and attributes from a declaration
42 statement, they get them from the following static variables. The
43 first part of a declaration sets these variables and the second
44 part copies these into symbol structures. */
46 static gfc_typespec current_ts;
48 static symbol_attribute current_attr;
49 static gfc_array_spec *current_as;
50 static int colon_seen;
52 /* The current binding label (if any). */
53 static char curr_binding_label[GFC_MAX_BINDING_LABEL_LEN + 1];
54 /* Need to know how many identifiers are on the current data declaration
55 line in case we're given the BIND(C) attribute with a NAME= specifier. */
56 static int num_idents_on_line;
57 /* Need to know if a NAME= specifier was found during gfc_match_bind_c so we
58 can supply a name if the curr_binding_label is nil and NAME= was not. */
59 static int has_name_equals = 0;
61 /* Initializer of the previous enumerator. */
63 static gfc_expr *last_initializer;
65 /* History of all the enumerators is maintained, so that
66 kind values of all the enumerators could be updated depending
67 upon the maximum initialized value. */
69 typedef struct enumerator_history
72 gfc_expr *initializer;
73 struct enumerator_history *next;
77 /* Header of enum history chain. */
79 static enumerator_history *enum_history = NULL;
81 /* Pointer of enum history node containing largest initializer. */
83 static enumerator_history *max_enum = NULL;
85 /* gfc_new_block points to the symbol of a newly matched block. */
87 gfc_symbol *gfc_new_block;
89 bool gfc_matching_function;
92 /********************* DATA statement subroutines *********************/
94 static bool in_match_data = false;
97 gfc_in_match_data (void)
103 set_in_match_data (bool set_value)
105 in_match_data = set_value;
108 /* Free a gfc_data_variable structure and everything beneath it. */
111 free_variable (gfc_data_variable *p)
113 gfc_data_variable *q;
118 gfc_free_expr (p->expr);
119 gfc_free_iterator (&p->iter, 0);
120 free_variable (p->list);
126 /* Free a gfc_data_value structure and everything beneath it. */
129 free_value (gfc_data_value *p)
136 gfc_free_expr (p->expr);
142 /* Free a list of gfc_data structures. */
145 gfc_free_data (gfc_data *p)
152 free_variable (p->var);
153 free_value (p->value);
159 /* Free all data in a namespace. */
162 gfc_free_data_all (gfc_namespace *ns)
175 static match var_element (gfc_data_variable *);
177 /* Match a list of variables terminated by an iterator and a right
181 var_list (gfc_data_variable *parent)
183 gfc_data_variable *tail, var;
186 m = var_element (&var);
187 if (m == MATCH_ERROR)
192 tail = gfc_get_data_variable ();
199 if (gfc_match_char (',') != MATCH_YES)
202 m = gfc_match_iterator (&parent->iter, 1);
205 if (m == MATCH_ERROR)
208 m = var_element (&var);
209 if (m == MATCH_ERROR)
214 tail->next = gfc_get_data_variable ();
220 if (gfc_match_char (')') != MATCH_YES)
225 gfc_syntax_error (ST_DATA);
230 /* Match a single element in a data variable list, which can be a
231 variable-iterator list. */
234 var_element (gfc_data_variable *new)
239 memset (new, 0, sizeof (gfc_data_variable));
241 if (gfc_match_char ('(') == MATCH_YES)
242 return var_list (new);
244 m = gfc_match_variable (&new->expr, 0);
248 sym = new->expr->symtree->n.sym;
250 if (!sym->attr.function && gfc_current_ns->parent
251 && gfc_current_ns->parent == sym->ns)
253 gfc_error ("Host associated variable '%s' may not be in the DATA "
254 "statement at %C", sym->name);
258 if (gfc_current_state () != COMP_BLOCK_DATA
259 && sym->attr.in_common
260 && gfc_notify_std (GFC_STD_GNU, "Extension: initialization of "
261 "common block variable '%s' in DATA statement at %C",
262 sym->name) == FAILURE)
265 if (gfc_add_data (&sym->attr, sym->name, &new->expr->where) == FAILURE)
272 /* Match the top-level list of data variables. */
275 top_var_list (gfc_data *d)
277 gfc_data_variable var, *tail, *new;
284 m = var_element (&var);
287 if (m == MATCH_ERROR)
290 new = gfc_get_data_variable ();
300 if (gfc_match_char ('/') == MATCH_YES)
302 if (gfc_match_char (',') != MATCH_YES)
309 gfc_syntax_error (ST_DATA);
310 gfc_free_data_all (gfc_current_ns);
316 match_data_constant (gfc_expr **result)
318 char name[GFC_MAX_SYMBOL_LEN + 1];
324 m = gfc_match_literal_constant (&expr, 1);
331 if (m == MATCH_ERROR)
334 m = gfc_match_null (result);
338 old_loc = gfc_current_locus;
340 /* Should this be a structure component, try to match it
341 before matching a name. */
342 m = gfc_match_rvalue (result);
343 if (m == MATCH_ERROR)
346 if (m == MATCH_YES && (*result)->expr_type == EXPR_STRUCTURE)
348 if (gfc_simplify_expr (*result, 0) == FAILURE)
353 gfc_current_locus = old_loc;
355 m = gfc_match_name (name);
359 if (gfc_find_symbol (name, NULL, 1, &sym))
363 || (sym->attr.flavor != FL_PARAMETER && sym->attr.flavor != FL_DERIVED))
365 gfc_error ("Symbol '%s' must be a PARAMETER in DATA statement at %C",
369 else if (sym->attr.flavor == FL_DERIVED)
370 return gfc_match_structure_constructor (sym, result);
372 /* Check to see if the value is an initialization array expression. */
373 if (sym->value->expr_type == EXPR_ARRAY)
375 gfc_current_locus = old_loc;
377 m = gfc_match_init_expr (result);
378 if (m == MATCH_ERROR)
383 if (gfc_simplify_expr (*result, 0) == FAILURE)
386 if ((*result)->expr_type == EXPR_CONSTANT)
390 gfc_error ("Invalid initializer %s in Data statement at %C", name);
396 *result = gfc_copy_expr (sym->value);
401 /* Match a list of values in a DATA statement. The leading '/' has
402 already been seen at this point. */
405 top_val_list (gfc_data *data)
407 gfc_data_value *new, *tail;
415 m = match_data_constant (&expr);
418 if (m == MATCH_ERROR)
421 new = gfc_get_data_value ();
422 mpz_init (new->repeat);
431 if (expr->ts.type != BT_INTEGER || gfc_match_char ('*') != MATCH_YES)
434 mpz_set_ui (tail->repeat, 1);
438 if (expr->ts.type == BT_INTEGER)
439 mpz_set (tail->repeat, expr->value.integer);
440 gfc_free_expr (expr);
442 m = match_data_constant (&tail->expr);
445 if (m == MATCH_ERROR)
449 if (gfc_match_char ('/') == MATCH_YES)
451 if (gfc_match_char (',') == MATCH_NO)
458 gfc_syntax_error (ST_DATA);
459 gfc_free_data_all (gfc_current_ns);
464 /* Matches an old style initialization. */
467 match_old_style_init (const char *name)
474 /* Set up data structure to hold initializers. */
475 gfc_find_sym_tree (name, NULL, 0, &st);
478 newdata = gfc_get_data ();
479 newdata->var = gfc_get_data_variable ();
480 newdata->var->expr = gfc_get_variable_expr (st);
481 newdata->where = gfc_current_locus;
483 /* Match initial value list. This also eats the terminal '/'. */
484 m = top_val_list (newdata);
493 gfc_error ("Initialization at %C is not allowed in a PURE procedure");
498 /* Mark the variable as having appeared in a data statement. */
499 if (gfc_add_data (&sym->attr, sym->name, &sym->declared_at) == FAILURE)
505 /* Chain in namespace list of DATA initializers. */
506 newdata->next = gfc_current_ns->data;
507 gfc_current_ns->data = newdata;
513 /* Match the stuff following a DATA statement. If ERROR_FLAG is set,
514 we are matching a DATA statement and are therefore issuing an error
515 if we encounter something unexpected, if not, we're trying to match
516 an old-style initialization expression of the form INTEGER I /2/. */
519 gfc_match_data (void)
524 set_in_match_data (true);
528 new = gfc_get_data ();
529 new->where = gfc_current_locus;
531 m = top_var_list (new);
535 m = top_val_list (new);
539 new->next = gfc_current_ns->data;
540 gfc_current_ns->data = new;
542 if (gfc_match_eos () == MATCH_YES)
545 gfc_match_char (','); /* Optional comma */
548 set_in_match_data (false);
552 gfc_error ("DATA statement at %C is not allowed in a PURE procedure");
559 set_in_match_data (false);
565 /************************ Declaration statements *********************/
567 /* Match an intent specification. Since this can only happen after an
568 INTENT word, a legal intent-spec must follow. */
571 match_intent_spec (void)
574 if (gfc_match (" ( in out )") == MATCH_YES)
576 if (gfc_match (" ( in )") == MATCH_YES)
578 if (gfc_match (" ( out )") == MATCH_YES)
581 gfc_error ("Bad INTENT specification at %C");
582 return INTENT_UNKNOWN;
586 /* Matches a character length specification, which is either a
587 specification expression or a '*'. */
590 char_len_param_value (gfc_expr **expr)
594 if (gfc_match_char ('*') == MATCH_YES)
600 m = gfc_match_expr (expr);
601 if (m == MATCH_YES && (*expr)->expr_type == EXPR_FUNCTION)
603 if ((*expr)->value.function.actual
604 && (*expr)->value.function.actual->expr->symtree)
607 e = (*expr)->value.function.actual->expr;
608 if (e->symtree->n.sym->attr.flavor == FL_PROCEDURE
609 && e->expr_type == EXPR_VARIABLE)
611 if (e->symtree->n.sym->ts.type == BT_UNKNOWN)
613 if (e->symtree->n.sym->ts.type == BT_CHARACTER
614 && e->symtree->n.sym->ts.cl
615 && e->symtree->n.sym->ts.cl->length->ts.type == BT_UNKNOWN)
623 gfc_error ("Conflict in attributes of function argument at %C");
628 /* A character length is a '*' followed by a literal integer or a
629 char_len_param_value in parenthesis. */
632 match_char_length (gfc_expr **expr)
637 m = gfc_match_char ('*');
641 m = gfc_match_small_literal_int (&length, NULL);
642 if (m == MATCH_ERROR)
647 *expr = gfc_int_expr (length);
651 if (gfc_match_char ('(') == MATCH_NO)
654 m = char_len_param_value (expr);
655 if (m != MATCH_YES && gfc_matching_function)
661 if (m == MATCH_ERROR)
666 if (gfc_match_char (')') == MATCH_NO)
668 gfc_free_expr (*expr);
676 gfc_error ("Syntax error in character length specification at %C");
681 /* Special subroutine for finding a symbol. Check if the name is found
682 in the current name space. If not, and we're compiling a function or
683 subroutine and the parent compilation unit is an interface, then check
684 to see if the name we've been given is the name of the interface
685 (located in another namespace). */
688 find_special (const char *name, gfc_symbol **result)
693 i = gfc_get_symbol (name, NULL, result);
697 if (gfc_current_state () != COMP_SUBROUTINE
698 && gfc_current_state () != COMP_FUNCTION)
701 s = gfc_state_stack->previous;
705 if (s->state != COMP_INTERFACE)
708 goto end; /* Nameless interface. */
710 if (strcmp (name, s->sym->name) == 0)
721 /* Special subroutine for getting a symbol node associated with a
722 procedure name, used in SUBROUTINE and FUNCTION statements. The
723 symbol is created in the parent using with symtree node in the
724 child unit pointing to the symbol. If the current namespace has no
725 parent, then the symbol is just created in the current unit. */
728 get_proc_name (const char *name, gfc_symbol **result, bool module_fcn_entry)
734 /* Module functions have to be left in their own namespace because
735 they have potentially (almost certainly!) already been referenced.
736 In this sense, they are rather like external functions. This is
737 fixed up in resolve.c(resolve_entries), where the symbol name-
738 space is set to point to the master function, so that the fake
739 result mechanism can work. */
740 if (module_fcn_entry)
742 /* Present if entry is declared to be a module procedure. */
743 rc = gfc_find_symbol (name, gfc_current_ns->parent, 0, result);
746 rc = gfc_get_symbol (name, NULL, result);
747 else if (!gfc_get_symbol (name, NULL, &sym) && sym
748 && (*result)->ts.type == BT_UNKNOWN
749 && sym->attr.flavor == FL_UNKNOWN)
750 /* Pick up the typespec for the entry, if declared in the function
751 body. Note that this symbol is FL_UNKNOWN because it will
752 only have appeared in a type declaration. The local symtree
753 is set to point to the module symbol and a unique symtree
754 to the local version. This latter ensures a correct clearing
757 /* If the ENTRY proceeds its specification, we need to ensure
758 that this does not raise a "has no IMPLICIT type" error. */
759 if (sym->ts.type == BT_UNKNOWN)
760 sym->attr.untyped = 1;
762 (*result)->ts = sym->ts;
764 /* Put the symbol in the procedure namespace so that, should
765 the ENTRY preceed its specification, the specification
767 (*result)->ns = gfc_current_ns;
769 gfc_find_sym_tree (name, gfc_current_ns, 0, &st);
771 st = gfc_get_unique_symtree (gfc_current_ns);
776 rc = gfc_get_symbol (name, gfc_current_ns->parent, result);
782 gfc_current_ns->refs++;
784 if (sym && !sym->new && gfc_current_state () != COMP_INTERFACE)
786 /* Trap another encompassed procedure with the same name. All
787 these conditions are necessary to avoid picking up an entry
788 whose name clashes with that of the encompassing procedure;
789 this is handled using gsymbols to register unique,globally
791 if (sym->attr.flavor != 0
792 && sym->attr.proc != 0
793 && (sym->attr.subroutine || sym->attr.function)
794 && sym->attr.if_source != IFSRC_UNKNOWN)
795 gfc_error_now ("Procedure '%s' at %C is already defined at %L",
796 name, &sym->declared_at);
798 /* Trap a procedure with a name the same as interface in the
799 encompassing scope. */
800 if (sym->attr.generic != 0
801 && (sym->attr.subroutine || sym->attr.function)
802 && !sym->attr.mod_proc)
803 gfc_error_now ("Name '%s' at %C is already defined"
804 " as a generic interface at %L",
805 name, &sym->declared_at);
807 /* Trap declarations of attributes in encompassing scope. The
808 signature for this is that ts.kind is set. Legitimate
809 references only set ts.type. */
810 if (sym->ts.kind != 0
811 && !sym->attr.implicit_type
812 && sym->attr.proc == 0
813 && gfc_current_ns->parent != NULL
814 && sym->attr.access == 0
815 && !module_fcn_entry)
816 gfc_error_now ("Procedure '%s' at %C has an explicit interface "
817 "and must not have attributes declared at %L",
818 name, &sym->declared_at);
821 if (gfc_current_ns->parent == NULL || *result == NULL)
824 /* Module function entries will already have a symtree in
825 the current namespace but will need one at module level. */
826 if (module_fcn_entry)
828 /* Present if entry is declared to be a module procedure. */
829 rc = gfc_find_sym_tree (name, gfc_current_ns->parent, 0, &st);
831 st = gfc_new_symtree (&gfc_current_ns->parent->sym_root, name);
834 st = gfc_new_symtree (&gfc_current_ns->sym_root, name);
839 /* See if the procedure should be a module procedure. */
841 if (((sym->ns->proc_name != NULL
842 && sym->ns->proc_name->attr.flavor == FL_MODULE
843 && sym->attr.proc != PROC_MODULE)
844 || (module_fcn_entry && sym->attr.proc != PROC_MODULE))
845 && gfc_add_procedure (&sym->attr, PROC_MODULE,
846 sym->name, NULL) == FAILURE)
853 /* Verify that the given symbol representing a parameter is C
854 interoperable, by checking to see if it was marked as such after
855 its declaration. If the given symbol is not interoperable, a
856 warning is reported, thus removing the need to return the status to
857 the calling function. The standard does not require the user use
858 one of the iso_c_binding named constants to declare an
859 interoperable parameter, but we can't be sure if the param is C
860 interop or not if the user doesn't. For example, integer(4) may be
861 legal Fortran, but doesn't have meaning in C. It may interop with
862 a number of the C types, which causes a problem because the
863 compiler can't know which one. This code is almost certainly not
864 portable, and the user will get what they deserve if the C type
865 across platforms isn't always interoperable with integer(4). If
866 the user had used something like integer(c_int) or integer(c_long),
867 the compiler could have automatically handled the varying sizes
871 verify_c_interop_param (gfc_symbol *sym)
873 int is_c_interop = 0;
874 try retval = SUCCESS;
876 /* We check implicitly typed variables in symbol.c:gfc_set_default_type().
877 Don't repeat the checks here. */
878 if (sym->attr.implicit_type)
881 /* For subroutines or functions that are passed to a BIND(C) procedure,
882 they're interoperable if they're BIND(C) and their params are all
884 if (sym->attr.flavor == FL_PROCEDURE)
886 if (sym->attr.is_bind_c == 0)
888 gfc_error_now ("Procedure '%s' at %L must have the BIND(C) "
889 "attribute to be C interoperable", sym->name,
890 &(sym->declared_at));
896 if (sym->attr.is_c_interop == 1)
897 /* We've already checked this procedure; don't check it again. */
900 return verify_bind_c_sym (sym, &(sym->ts), sym->attr.in_common,
905 /* See if we've stored a reference to a procedure that owns sym. */
906 if (sym->ns != NULL && sym->ns->proc_name != NULL)
908 if (sym->ns->proc_name->attr.is_bind_c == 1)
911 (verify_c_interop (&(sym->ts), sym->name, &(sym->declared_at))
914 if (is_c_interop != 1)
916 /* Make personalized messages to give better feedback. */
917 if (sym->ts.type == BT_DERIVED)
918 gfc_error ("Type '%s' at %L is a parameter to the BIND(C) "
919 " procedure '%s' but is not C interoperable "
920 "because derived type '%s' is not C interoperable",
921 sym->name, &(sym->declared_at),
922 sym->ns->proc_name->name,
923 sym->ts.derived->name);
925 gfc_warning ("Variable '%s' at %L is a parameter to the "
926 "BIND(C) procedure '%s' but may not be C "
928 sym->name, &(sym->declared_at),
929 sym->ns->proc_name->name);
932 /* Character strings are only C interoperable if they have a
934 if (sym->ts.type == BT_CHARACTER)
936 gfc_charlen *cl = sym->ts.cl;
937 if (!cl || !cl->length || cl->length->expr_type != EXPR_CONSTANT
938 || mpz_cmp_si (cl->length->value.integer, 1) != 0)
940 gfc_error ("Character argument '%s' at %L "
941 "must be length 1 because "
942 "procedure '%s' is BIND(C)",
943 sym->name, &sym->declared_at,
944 sym->ns->proc_name->name);
949 /* We have to make sure that any param to a bind(c) routine does
950 not have the allocatable, pointer, or optional attributes,
951 according to J3/04-007, section 5.1. */
952 if (sym->attr.allocatable == 1)
954 gfc_error ("Variable '%s' at %L cannot have the "
955 "ALLOCATABLE attribute because procedure '%s'"
956 " is BIND(C)", sym->name, &(sym->declared_at),
957 sym->ns->proc_name->name);
961 if (sym->attr.pointer == 1)
963 gfc_error ("Variable '%s' at %L cannot have the "
964 "POINTER attribute because procedure '%s'"
965 " is BIND(C)", sym->name, &(sym->declared_at),
966 sym->ns->proc_name->name);
970 if (sym->attr.optional == 1)
972 gfc_error ("Variable '%s' at %L cannot have the "
973 "OPTIONAL attribute because procedure '%s'"
974 " is BIND(C)", sym->name, &(sym->declared_at),
975 sym->ns->proc_name->name);
979 /* Make sure that if it has the dimension attribute, that it is
980 either assumed size or explicit shape. */
983 if (sym->as->type == AS_ASSUMED_SHAPE)
985 gfc_error ("Assumed-shape array '%s' at %L cannot be an "
986 "argument to the procedure '%s' at %L because "
987 "the procedure is BIND(C)", sym->name,
988 &(sym->declared_at), sym->ns->proc_name->name,
989 &(sym->ns->proc_name->declared_at));
993 if (sym->as->type == AS_DEFERRED)
995 gfc_error ("Deferred-shape array '%s' at %L cannot be an "
996 "argument to the procedure '%s' at %L because "
997 "the procedure is BIND(C)", sym->name,
998 &(sym->declared_at), sym->ns->proc_name->name,
999 &(sym->ns->proc_name->declared_at));
1010 /* Function called by variable_decl() that adds a name to the symbol table. */
1013 build_sym (const char *name, gfc_charlen *cl,
1014 gfc_array_spec **as, locus *var_locus)
1016 symbol_attribute attr;
1019 if (gfc_get_symbol (name, NULL, &sym))
1022 /* Start updating the symbol table. Add basic type attribute if present. */
1023 if (current_ts.type != BT_UNKNOWN
1024 && (sym->attr.implicit_type == 0
1025 || !gfc_compare_types (&sym->ts, ¤t_ts))
1026 && gfc_add_type (sym, ¤t_ts, var_locus) == FAILURE)
1029 if (sym->ts.type == BT_CHARACTER)
1032 /* Add dimension attribute if present. */
1033 if (gfc_set_array_spec (sym, *as, var_locus) == FAILURE)
1037 /* Add attribute to symbol. The copy is so that we can reset the
1038 dimension attribute. */
1039 attr = current_attr;
1042 if (gfc_copy_attr (&sym->attr, &attr, var_locus) == FAILURE)
1045 /* Finish any work that may need to be done for the binding label,
1046 if it's a bind(c). The bind(c) attr is found before the symbol
1047 is made, and before the symbol name (for data decls), so the
1048 current_ts is holding the binding label, or nothing if the
1049 name= attr wasn't given. Therefore, test here if we're dealing
1050 with a bind(c) and make sure the binding label is set correctly. */
1051 if (sym->attr.is_bind_c == 1)
1053 if (sym->binding_label[0] == '\0')
1055 /* Set the binding label and verify that if a NAME= was specified
1056 then only one identifier was in the entity-decl-list. */
1057 if (set_binding_label (sym->binding_label, sym->name,
1058 num_idents_on_line) == FAILURE)
1063 /* See if we know we're in a common block, and if it's a bind(c)
1064 common then we need to make sure we're an interoperable type. */
1065 if (sym->attr.in_common == 1)
1067 /* Test the common block object. */
1068 if (sym->common_block != NULL && sym->common_block->is_bind_c == 1
1069 && sym->ts.is_c_interop != 1)
1071 gfc_error_now ("Variable '%s' in common block '%s' at %C "
1072 "must be declared with a C interoperable "
1073 "kind since common block '%s' is BIND(C)",
1074 sym->name, sym->common_block->name,
1075 sym->common_block->name);
1080 sym->attr.implied_index = 0;
1086 /* Set character constant to the given length. The constant will be padded or
1090 gfc_set_constant_character_len (int len, gfc_expr *expr, bool array)
1095 gcc_assert (expr->expr_type == EXPR_CONSTANT);
1096 gcc_assert (expr->ts.type == BT_CHARACTER && expr->ts.kind == 1);
1098 slen = expr->value.character.length;
1101 s = gfc_get_wide_string (len + 1);
1102 memcpy (s, expr->value.character.string,
1103 MIN (len, slen) * sizeof (gfc_char_t));
1105 gfc_wide_memset (&s[slen], ' ', len - slen);
1107 if (gfc_option.warn_character_truncation && slen > len)
1108 gfc_warning_now ("CHARACTER expression at %L is being truncated "
1109 "(%d/%d)", &expr->where, slen, len);
1111 /* Apply the standard by 'hand' otherwise it gets cleared for
1113 if (array && slen < len && !(gfc_option.allow_std & GFC_STD_GNU))
1114 gfc_error_now ("The CHARACTER elements of the array constructor "
1115 "at %L must have the same length (%d/%d)",
1116 &expr->where, slen, len);
1119 gfc_free (expr->value.character.string);
1120 expr->value.character.string = s;
1121 expr->value.character.length = len;
1126 /* Function to create and update the enumerator history
1127 using the information passed as arguments.
1128 Pointer "max_enum" is also updated, to point to
1129 enum history node containing largest initializer.
1131 SYM points to the symbol node of enumerator.
1132 INIT points to its enumerator value. */
1135 create_enum_history (gfc_symbol *sym, gfc_expr *init)
1137 enumerator_history *new_enum_history;
1138 gcc_assert (sym != NULL && init != NULL);
1140 new_enum_history = gfc_getmem (sizeof (enumerator_history));
1142 new_enum_history->sym = sym;
1143 new_enum_history->initializer = init;
1144 new_enum_history->next = NULL;
1146 if (enum_history == NULL)
1148 enum_history = new_enum_history;
1149 max_enum = enum_history;
1153 new_enum_history->next = enum_history;
1154 enum_history = new_enum_history;
1156 if (mpz_cmp (max_enum->initializer->value.integer,
1157 new_enum_history->initializer->value.integer) < 0)
1158 max_enum = new_enum_history;
1163 /* Function to free enum kind history. */
1166 gfc_free_enum_history (void)
1168 enumerator_history *current = enum_history;
1169 enumerator_history *next;
1171 while (current != NULL)
1173 next = current->next;
1178 enum_history = NULL;
1182 /* Function called by variable_decl() that adds an initialization
1183 expression to a symbol. */
1186 add_init_expr_to_sym (const char *name, gfc_expr **initp, locus *var_locus)
1188 symbol_attribute attr;
1193 if (find_special (name, &sym))
1198 /* If this symbol is confirming an implicit parameter type,
1199 then an initialization expression is not allowed. */
1200 if (attr.flavor == FL_PARAMETER
1201 && sym->value != NULL
1204 gfc_error ("Initializer not allowed for PARAMETER '%s' at %C",
1211 /* An initializer is required for PARAMETER declarations. */
1212 if (attr.flavor == FL_PARAMETER)
1214 gfc_error ("PARAMETER at %L is missing an initializer", var_locus);
1220 /* If a variable appears in a DATA block, it cannot have an
1224 gfc_error ("Variable '%s' at %C with an initializer already "
1225 "appears in a DATA statement", sym->name);
1229 /* Check if the assignment can happen. This has to be put off
1230 until later for a derived type variable. */
1231 if (sym->ts.type != BT_DERIVED && init->ts.type != BT_DERIVED
1232 && gfc_check_assign_symbol (sym, init) == FAILURE)
1235 if (sym->ts.type == BT_CHARACTER && sym->ts.cl)
1237 /* Update symbol character length according initializer. */
1238 if (sym->ts.cl->length == NULL)
1241 /* If there are multiple CHARACTER variables declared on the
1242 same line, we don't want them to share the same length. */
1243 sym->ts.cl = gfc_get_charlen ();
1244 sym->ts.cl->next = gfc_current_ns->cl_list;
1245 gfc_current_ns->cl_list = sym->ts.cl;
1247 if (sym->attr.flavor == FL_PARAMETER)
1249 if (init->expr_type == EXPR_CONSTANT)
1251 clen = init->value.character.length;
1252 sym->ts.cl->length = gfc_int_expr (clen);
1254 else if (init->expr_type == EXPR_ARRAY)
1256 gfc_expr *p = init->value.constructor->expr;
1257 clen = p->value.character.length;
1258 sym->ts.cl->length = gfc_int_expr (clen);
1260 else if (init->ts.cl && init->ts.cl->length)
1261 sym->ts.cl->length =
1262 gfc_copy_expr (sym->value->ts.cl->length);
1265 /* Update initializer character length according symbol. */
1266 else if (sym->ts.cl->length->expr_type == EXPR_CONSTANT)
1268 int len = mpz_get_si (sym->ts.cl->length->value.integer);
1269 gfc_constructor * p;
1271 if (init->expr_type == EXPR_CONSTANT)
1272 gfc_set_constant_character_len (len, init, false);
1273 else if (init->expr_type == EXPR_ARRAY)
1275 /* Build a new charlen to prevent simplification from
1276 deleting the length before it is resolved. */
1277 init->ts.cl = gfc_get_charlen ();
1278 init->ts.cl->next = gfc_current_ns->cl_list;
1279 gfc_current_ns->cl_list = sym->ts.cl;
1280 init->ts.cl->length = gfc_copy_expr (sym->ts.cl->length);
1282 for (p = init->value.constructor; p; p = p->next)
1283 gfc_set_constant_character_len (len, p->expr, false);
1288 /* Need to check if the expression we initialized this
1289 to was one of the iso_c_binding named constants. If so,
1290 and we're a parameter (constant), let it be iso_c.
1292 integer(c_int), parameter :: my_int = c_int
1293 integer(my_int) :: my_int_2
1294 If we mark my_int as iso_c (since we can see it's value
1295 is equal to one of the named constants), then my_int_2
1296 will be considered C interoperable. */
1297 if (sym->ts.type != BT_CHARACTER && sym->ts.type != BT_DERIVED)
1299 sym->ts.is_iso_c |= init->ts.is_iso_c;
1300 sym->ts.is_c_interop |= init->ts.is_c_interop;
1301 /* attr bits needed for module files. */
1302 sym->attr.is_iso_c |= init->ts.is_iso_c;
1303 sym->attr.is_c_interop |= init->ts.is_c_interop;
1304 if (init->ts.is_iso_c)
1305 sym->ts.f90_type = init->ts.f90_type;
1308 /* Add initializer. Make sure we keep the ranks sane. */
1309 if (sym->attr.dimension && init->rank == 0)
1315 if (sym->attr.flavor == FL_PARAMETER
1316 && init->expr_type == EXPR_CONSTANT
1317 && spec_size (sym->as, &size) == SUCCESS
1318 && mpz_cmp_si (size, 0) > 0)
1320 array = gfc_start_constructor (init->ts.type, init->ts.kind,
1323 array->value.constructor = c = NULL;
1324 for (n = 0; n < (int)mpz_get_si (size); n++)
1326 if (array->value.constructor == NULL)
1328 array->value.constructor = c = gfc_get_constructor ();
1333 c->next = gfc_get_constructor ();
1335 c->expr = gfc_copy_expr (init);
1339 array->shape = gfc_get_shape (sym->as->rank);
1340 for (n = 0; n < sym->as->rank; n++)
1341 spec_dimen_size (sym->as, n, &array->shape[n]);
1346 init->rank = sym->as->rank;
1350 if (sym->attr.save == SAVE_NONE)
1351 sym->attr.save = SAVE_IMPLICIT;
1359 /* Function called by variable_decl() that adds a name to a structure
1363 build_struct (const char *name, gfc_charlen *cl, gfc_expr **init,
1364 gfc_array_spec **as)
1368 /* If the current symbol is of the same derived type that we're
1369 constructing, it must have the pointer attribute. */
1370 if (current_ts.type == BT_DERIVED
1371 && current_ts.derived == gfc_current_block ()
1372 && current_attr.pointer == 0)
1374 gfc_error ("Component at %C must have the POINTER attribute");
1378 if (gfc_current_block ()->attr.pointer && (*as)->rank != 0)
1380 if ((*as)->type != AS_DEFERRED && (*as)->type != AS_EXPLICIT)
1382 gfc_error ("Array component of structure at %C must have explicit "
1383 "or deferred shape");
1388 if (gfc_add_component (gfc_current_block (), name, &c) == FAILURE)
1393 gfc_set_component_attr (c, ¤t_attr);
1395 c->initializer = *init;
1403 /* Should this ever get more complicated, combine with similar section
1404 in add_init_expr_to_sym into a separate function. */
1405 if (c->ts.type == BT_CHARACTER && !c->pointer && c->initializer)
1407 int len = mpz_get_si (c->ts.cl->length->value.integer);
1409 if (c->initializer->expr_type == EXPR_CONSTANT)
1410 gfc_set_constant_character_len (len, c->initializer, false);
1411 else if (mpz_cmp (c->ts.cl->length->value.integer,
1412 c->initializer->ts.cl->length->value.integer))
1414 gfc_constructor *ctor = c->initializer->value.constructor;
1415 for (;ctor ; ctor = ctor->next)
1416 if (ctor->expr->expr_type == EXPR_CONSTANT)
1417 gfc_set_constant_character_len (len, ctor->expr, true);
1421 /* Check array components. */
1426 gfc_error ("Allocatable component at %C must be an array");
1435 if (c->as->type != AS_DEFERRED)
1437 gfc_error ("Pointer array component of structure at %C must have a "
1442 else if (c->allocatable)
1444 if (c->as->type != AS_DEFERRED)
1446 gfc_error ("Allocatable component of structure at %C must have a "
1453 if (c->as->type != AS_EXPLICIT)
1455 gfc_error ("Array component of structure at %C must have an "
1465 /* Match a 'NULL()', and possibly take care of some side effects. */
1468 gfc_match_null (gfc_expr **result)
1474 m = gfc_match (" null ( )");
1478 /* The NULL symbol now has to be/become an intrinsic function. */
1479 if (gfc_get_symbol ("null", NULL, &sym))
1481 gfc_error ("NULL() initialization at %C is ambiguous");
1485 gfc_intrinsic_symbol (sym);
1487 if (sym->attr.proc != PROC_INTRINSIC
1488 && (gfc_add_procedure (&sym->attr, PROC_INTRINSIC,
1489 sym->name, NULL) == FAILURE
1490 || gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE))
1493 e = gfc_get_expr ();
1494 e->where = gfc_current_locus;
1495 e->expr_type = EXPR_NULL;
1496 e->ts.type = BT_UNKNOWN;
1504 /* Match a variable name with an optional initializer. When this
1505 subroutine is called, a variable is expected to be parsed next.
1506 Depending on what is happening at the moment, updates either the
1507 symbol table or the current interface. */
1510 variable_decl (int elem)
1512 char name[GFC_MAX_SYMBOL_LEN + 1];
1513 gfc_expr *initializer, *char_len;
1515 gfc_array_spec *cp_as; /* Extra copy for Cray Pointees. */
1526 old_locus = gfc_current_locus;
1528 /* When we get here, we've just matched a list of attributes and
1529 maybe a type and a double colon. The next thing we expect to see
1530 is the name of the symbol. */
1531 m = gfc_match_name (name);
1535 var_locus = gfc_current_locus;
1537 /* Now we could see the optional array spec. or character length. */
1538 m = gfc_match_array_spec (&as);
1539 if (gfc_option.flag_cray_pointer && m == MATCH_YES)
1540 cp_as = gfc_copy_array_spec (as);
1541 else if (m == MATCH_ERROR)
1545 as = gfc_copy_array_spec (current_as);
1550 if (current_ts.type == BT_CHARACTER)
1552 switch (match_char_length (&char_len))
1555 cl = gfc_get_charlen ();
1556 cl->next = gfc_current_ns->cl_list;
1557 gfc_current_ns->cl_list = cl;
1559 cl->length = char_len;
1562 /* Non-constant lengths need to be copied after the first
1563 element. Also copy assumed lengths. */
1566 && (current_ts.cl->length == NULL
1567 || current_ts.cl->length->expr_type != EXPR_CONSTANT))
1569 cl = gfc_get_charlen ();
1570 cl->next = gfc_current_ns->cl_list;
1571 gfc_current_ns->cl_list = cl;
1572 cl->length = gfc_copy_expr (current_ts.cl->length);
1584 /* If this symbol has already shown up in a Cray Pointer declaration,
1585 then we want to set the type & bail out. */
1586 if (gfc_option.flag_cray_pointer)
1588 gfc_find_symbol (name, gfc_current_ns, 1, &sym);
1589 if (sym != NULL && sym->attr.cray_pointee)
1591 sym->ts.type = current_ts.type;
1592 sym->ts.kind = current_ts.kind;
1594 sym->ts.derived = current_ts.derived;
1595 sym->ts.is_c_interop = current_ts.is_c_interop;
1596 sym->ts.is_iso_c = current_ts.is_iso_c;
1599 /* Check to see if we have an array specification. */
1602 if (sym->as != NULL)
1604 gfc_error ("Duplicate array spec for Cray pointee at %C");
1605 gfc_free_array_spec (cp_as);
1611 if (gfc_set_array_spec (sym, cp_as, &var_locus) == FAILURE)
1612 gfc_internal_error ("Couldn't set pointee array spec.");
1614 /* Fix the array spec. */
1615 m = gfc_mod_pointee_as (sym->as);
1616 if (m == MATCH_ERROR)
1624 gfc_free_array_spec (cp_as);
1629 /* OK, we've successfully matched the declaration. Now put the
1630 symbol in the current namespace, because it might be used in the
1631 optional initialization expression for this symbol, e.g. this is
1634 integer, parameter :: i = huge(i)
1636 This is only true for parameters or variables of a basic type.
1637 For components of derived types, it is not true, so we don't
1638 create a symbol for those yet. If we fail to create the symbol,
1640 if (gfc_current_state () != COMP_DERIVED
1641 && build_sym (name, cl, &as, &var_locus) == FAILURE)
1647 /* An interface body specifies all of the procedure's
1648 characteristics and these shall be consistent with those
1649 specified in the procedure definition, except that the interface
1650 may specify a procedure that is not pure if the procedure is
1651 defined to be pure(12.3.2). */
1652 if (current_ts.type == BT_DERIVED
1653 && gfc_current_ns->proc_name
1654 && gfc_current_ns->proc_name->attr.if_source == IFSRC_IFBODY
1655 && current_ts.derived->ns != gfc_current_ns)
1658 st = gfc_find_symtree (gfc_current_ns->sym_root, current_ts.derived->name);
1659 if (!(current_ts.derived->attr.imported
1661 && st->n.sym == current_ts.derived)
1662 && !gfc_current_ns->has_import_set)
1664 gfc_error ("the type of '%s' at %C has not been declared within the "
1671 /* In functions that have a RESULT variable defined, the function
1672 name always refers to function calls. Therefore, the name is
1673 not allowed to appear in specification statements. */
1674 if (gfc_current_state () == COMP_FUNCTION
1675 && gfc_current_block () != NULL
1676 && gfc_current_block ()->result != NULL
1677 && gfc_current_block ()->result != gfc_current_block ()
1678 && strcmp (gfc_current_block ()->name, name) == 0)
1680 gfc_error ("Function name '%s' not allowed at %C", name);
1685 /* We allow old-style initializations of the form
1686 integer i /2/, j(4) /3*3, 1/
1687 (if no colon has been seen). These are different from data
1688 statements in that initializers are only allowed to apply to the
1689 variable immediately preceding, i.e.
1691 is not allowed. Therefore we have to do some work manually, that
1692 could otherwise be left to the matchers for DATA statements. */
1694 if (!colon_seen && gfc_match (" /") == MATCH_YES)
1696 if (gfc_notify_std (GFC_STD_GNU, "Extension: Old-style "
1697 "initialization at %C") == FAILURE)
1700 return match_old_style_init (name);
1703 /* The double colon must be present in order to have initializers.
1704 Otherwise the statement is ambiguous with an assignment statement. */
1707 if (gfc_match (" =>") == MATCH_YES)
1709 if (!current_attr.pointer)
1711 gfc_error ("Initialization at %C isn't for a pointer variable");
1716 m = gfc_match_null (&initializer);
1719 gfc_error ("Pointer initialization requires a NULL() at %C");
1723 if (gfc_pure (NULL))
1725 gfc_error ("Initialization of pointer at %C is not allowed in "
1726 "a PURE procedure");
1734 else if (gfc_match_char ('=') == MATCH_YES)
1736 if (current_attr.pointer)
1738 gfc_error ("Pointer initialization at %C requires '=>', "
1744 m = gfc_match_init_expr (&initializer);
1747 gfc_error ("Expected an initialization expression at %C");
1751 if (current_attr.flavor != FL_PARAMETER && gfc_pure (NULL))
1753 gfc_error ("Initialization of variable at %C is not allowed in "
1754 "a PURE procedure");
1763 if (initializer != NULL && current_attr.allocatable
1764 && gfc_current_state () == COMP_DERIVED)
1766 gfc_error ("Initialization of allocatable component at %C is not "
1772 /* Add the initializer. Note that it is fine if initializer is
1773 NULL here, because we sometimes also need to check if a
1774 declaration *must* have an initialization expression. */
1775 if (gfc_current_state () != COMP_DERIVED)
1776 t = add_init_expr_to_sym (name, &initializer, &var_locus);
1779 if (current_ts.type == BT_DERIVED
1780 && !current_attr.pointer && !initializer)
1781 initializer = gfc_default_initializer (¤t_ts);
1782 t = build_struct (name, cl, &initializer, &as);
1785 m = (t == SUCCESS) ? MATCH_YES : MATCH_ERROR;
1788 /* Free stuff up and return. */
1789 gfc_free_expr (initializer);
1790 gfc_free_array_spec (as);
1796 /* Match an extended-f77 "TYPESPEC*bytesize"-style kind specification.
1797 This assumes that the byte size is equal to the kind number for
1798 non-COMPLEX types, and equal to twice the kind number for COMPLEX. */
1801 gfc_match_old_kind_spec (gfc_typespec *ts)
1806 if (gfc_match_char ('*') != MATCH_YES)
1809 m = gfc_match_small_literal_int (&ts->kind, NULL);
1813 original_kind = ts->kind;
1815 /* Massage the kind numbers for complex types. */
1816 if (ts->type == BT_COMPLEX)
1820 gfc_error ("Old-style type declaration %s*%d not supported at %C",
1821 gfc_basic_typename (ts->type), original_kind);
1827 if (gfc_validate_kind (ts->type, ts->kind, true) < 0)
1829 gfc_error ("Old-style type declaration %s*%d not supported at %C",
1830 gfc_basic_typename (ts->type), original_kind);
1834 if (gfc_notify_std (GFC_STD_GNU, "Nonstandard type declaration %s*%d at %C",
1835 gfc_basic_typename (ts->type), original_kind) == FAILURE)
1842 /* Match a kind specification. Since kinds are generally optional, we
1843 usually return MATCH_NO if something goes wrong. If a "kind="
1844 string is found, then we know we have an error. */
1847 gfc_match_kind_spec (gfc_typespec *ts, bool kind_expr_only)
1859 where = loc = gfc_current_locus;
1864 if (gfc_match_char ('(') == MATCH_NO)
1867 /* Also gobbles optional text. */
1868 if (gfc_match (" kind = ") == MATCH_YES)
1871 loc = gfc_current_locus;
1874 n = gfc_match_init_expr (&e);
1878 if (gfc_matching_function)
1880 /* The function kind expression might include use associated or
1881 imported parameters and try again after the specification
1883 if (gfc_match_char (')') != MATCH_YES)
1885 gfc_error ("Missing right parenthesis at %C");
1891 gfc_undo_symbols ();
1896 /* ....or else, the match is real. */
1898 gfc_error ("Expected initialization expression at %C");
1906 gfc_error ("Expected scalar initialization expression at %C");
1911 msg = gfc_extract_int (e, &ts->kind);
1920 /* Before throwing away the expression, let's see if we had a
1921 C interoperable kind (and store the fact). */
1922 if (e->ts.is_c_interop == 1)
1924 /* Mark this as c interoperable if being declared with one
1925 of the named constants from iso_c_binding. */
1926 ts->is_c_interop = e->ts.is_iso_c;
1927 ts->f90_type = e->ts.f90_type;
1933 /* Ignore errors to this point, if we've gotten here. This means
1934 we ignore the m=MATCH_ERROR from above. */
1935 if (gfc_validate_kind (ts->type, ts->kind, true) < 0)
1937 gfc_error ("Kind %d not supported for type %s at %C", ts->kind,
1938 gfc_basic_typename (ts->type));
1939 gfc_current_locus = where;
1943 gfc_gobble_whitespace ();
1944 if ((c = gfc_next_ascii_char ()) != ')'
1945 && (ts->type != BT_CHARACTER || c != ','))
1947 if (ts->type == BT_CHARACTER)
1948 gfc_error ("Missing right parenthesis or comma at %C");
1950 gfc_error ("Missing right parenthesis at %C");
1954 /* All tests passed. */
1957 if(m == MATCH_ERROR)
1958 gfc_current_locus = where;
1960 /* Return what we know from the test(s). */
1965 gfc_current_locus = where;
1971 match_char_kind (int * kind, int * is_iso_c)
1980 where = gfc_current_locus;
1982 n = gfc_match_init_expr (&e);
1984 if (n != MATCH_YES && gfc_matching_function)
1986 /* The expression might include use-associated or imported
1987 parameters and try again after the specification
1990 gfc_undo_symbols ();
1995 gfc_error ("Expected initialization expression at %C");
2001 gfc_error ("Expected scalar initialization expression at %C");
2006 msg = gfc_extract_int (e, kind);
2007 *is_iso_c = e->ts.is_iso_c;
2017 /* Ignore errors to this point, if we've gotten here. This means
2018 we ignore the m=MATCH_ERROR from above. */
2019 if (gfc_validate_kind (BT_CHARACTER, *kind, true) < 0)
2021 gfc_error ("Kind %d is not supported for CHARACTER at %C", *kind);
2025 /* All tests passed. */
2028 if (m == MATCH_ERROR)
2029 gfc_current_locus = where;
2031 /* Return what we know from the test(s). */
2036 gfc_current_locus = where;
2040 /* Match the various kind/length specifications in a CHARACTER
2041 declaration. We don't return MATCH_NO. */
2044 match_char_spec (gfc_typespec *ts)
2046 int kind, seen_length, is_iso_c;
2056 /* Try the old-style specification first. */
2057 old_char_selector = 0;
2059 m = match_char_length (&len);
2063 old_char_selector = 1;
2068 m = gfc_match_char ('(');
2071 m = MATCH_YES; /* Character without length is a single char. */
2075 /* Try the weird case: ( KIND = <int> [ , LEN = <len-param> ] ). */
2076 if (gfc_match (" kind =") == MATCH_YES)
2078 m = match_char_kind (&kind, &is_iso_c);
2080 if (m == MATCH_ERROR)
2085 if (gfc_match (" , len =") == MATCH_NO)
2088 m = char_len_param_value (&len);
2091 if (m == MATCH_ERROR)
2098 /* Try to match "LEN = <len-param>" or "LEN = <len-param>, KIND = <int>". */
2099 if (gfc_match (" len =") == MATCH_YES)
2101 m = char_len_param_value (&len);
2104 if (m == MATCH_ERROR)
2108 if (gfc_match_char (')') == MATCH_YES)
2111 if (gfc_match (" , kind =") != MATCH_YES)
2114 if (match_char_kind (&kind, &is_iso_c) == MATCH_ERROR)
2120 /* Try to match ( <len-param> ) or ( <len-param> , [ KIND = ] <int> ). */
2121 m = char_len_param_value (&len);
2124 if (m == MATCH_ERROR)
2128 m = gfc_match_char (')');
2132 if (gfc_match_char (',') != MATCH_YES)
2135 gfc_match (" kind ="); /* Gobble optional text. */
2137 m = match_char_kind (&kind, &is_iso_c);
2138 if (m == MATCH_ERROR)
2144 /* Require a right-paren at this point. */
2145 m = gfc_match_char (')');
2150 gfc_error ("Syntax error in CHARACTER declaration at %C");
2152 gfc_free_expr (len);
2156 /* Deal with character functions after USE and IMPORT statements. */
2157 if (gfc_matching_function)
2159 gfc_free_expr (len);
2160 gfc_undo_symbols ();
2166 gfc_free_expr (len);
2170 /* Do some final massaging of the length values. */
2171 cl = gfc_get_charlen ();
2172 cl->next = gfc_current_ns->cl_list;
2173 gfc_current_ns->cl_list = cl;
2175 if (seen_length == 0)
2176 cl->length = gfc_int_expr (1);
2181 ts->kind = kind == 0 ? gfc_default_character_kind : kind;
2183 /* We have to know if it was a c interoperable kind so we can
2184 do accurate type checking of bind(c) procs, etc. */
2186 /* Mark this as c interoperable if being declared with one
2187 of the named constants from iso_c_binding. */
2188 ts->is_c_interop = is_iso_c;
2189 else if (len != NULL)
2190 /* Here, we might have parsed something such as: character(c_char)
2191 In this case, the parsing code above grabs the c_char when
2192 looking for the length (line 1690, roughly). it's the last
2193 testcase for parsing the kind params of a character variable.
2194 However, it's not actually the length. this seems like it
2196 To see if the user used a C interop kind, test the expr
2197 of the so called length, and see if it's C interoperable. */
2198 ts->is_c_interop = len->ts.is_iso_c;
2204 /* Matches a type specification. If successful, sets the ts structure
2205 to the matched specification. This is necessary for FUNCTION and
2206 IMPLICIT statements.
2208 If implicit_flag is nonzero, then we don't check for the optional
2209 kind specification. Not doing so is needed for matching an IMPLICIT
2210 statement correctly. */
2213 gfc_match_type_spec (gfc_typespec *ts, int implicit_flag)
2215 char name[GFC_MAX_SYMBOL_LEN + 1];
2219 bool seen_deferred_kind;
2221 /* A belt and braces check that the typespec is correctly being treated
2222 as a deferred characteristic association. */
2223 seen_deferred_kind = (gfc_current_state () == COMP_FUNCTION)
2224 && (gfc_current_block ()->result->ts.kind == -1)
2225 && (ts->kind == -1);
2227 if (seen_deferred_kind)
2230 /* Clear the current binding label, in case one is given. */
2231 curr_binding_label[0] = '\0';
2233 if (gfc_match (" byte") == MATCH_YES)
2235 if (gfc_notify_std(GFC_STD_GNU, "Extension: BYTE type at %C")
2239 if (gfc_validate_kind (BT_INTEGER, 1, true) < 0)
2241 gfc_error ("BYTE type used at %C "
2242 "is not available on the target machine");
2246 ts->type = BT_INTEGER;
2251 if (gfc_match (" integer") == MATCH_YES)
2253 ts->type = BT_INTEGER;
2254 ts->kind = gfc_default_integer_kind;
2258 if (gfc_match (" character") == MATCH_YES)
2260 ts->type = BT_CHARACTER;
2261 if (implicit_flag == 0)
2262 return match_char_spec (ts);
2267 if (gfc_match (" real") == MATCH_YES)
2270 ts->kind = gfc_default_real_kind;
2274 if (gfc_match (" double precision") == MATCH_YES)
2277 ts->kind = gfc_default_double_kind;
2281 if (gfc_match (" complex") == MATCH_YES)
2283 ts->type = BT_COMPLEX;
2284 ts->kind = gfc_default_complex_kind;
2288 if (gfc_match (" double complex") == MATCH_YES)
2290 if (gfc_notify_std (GFC_STD_GNU, "DOUBLE COMPLEX at %C does not "
2291 "conform to the Fortran 95 standard") == FAILURE)
2294 ts->type = BT_COMPLEX;
2295 ts->kind = gfc_default_double_kind;
2299 if (gfc_match (" logical") == MATCH_YES)
2301 ts->type = BT_LOGICAL;
2302 ts->kind = gfc_default_logical_kind;
2306 m = gfc_match (" type ( %n )", name);
2310 ts->type = BT_DERIVED;
2312 /* Defer association of the derived type until the end of the
2313 specification block. However, if the derived type can be
2314 found, add it to the typespec. */
2315 if (gfc_matching_function)
2318 if (gfc_current_state () != COMP_INTERFACE
2319 && !gfc_find_symbol (name, NULL, 1, &sym) && sym)
2324 /* Search for the name but allow the components to be defined later. If
2325 type = -1, this typespec has been seen in a function declaration but
2326 the type could not be accessed at that point. */
2328 if (ts->kind != -1 && gfc_get_ha_symbol (name, &sym))
2330 gfc_error ("Type name '%s' at %C is ambiguous", name);
2333 else if (ts->kind == -1)
2335 int iface = gfc_state_stack->previous->state != COMP_INTERFACE
2336 || gfc_current_ns->has_import_set;
2337 if (gfc_find_symbol (name, NULL, iface, &sym))
2339 gfc_error ("Type name '%s' at %C is ambiguous", name);
2348 if (sym->attr.flavor != FL_DERIVED
2349 && gfc_add_flavor (&sym->attr, FL_DERIVED, sym->name, NULL) == FAILURE)
2352 gfc_set_sym_referenced (sym);
2358 /* For all types except double, derived and character, look for an
2359 optional kind specifier. MATCH_NO is actually OK at this point. */
2360 if (implicit_flag == 1)
2363 if (gfc_current_form == FORM_FREE)
2365 c = gfc_peek_ascii_char();
2366 if (!gfc_is_whitespace(c) && c != '*' && c != '('
2367 && c != ':' && c != ',')
2371 m = gfc_match_kind_spec (ts, false);
2372 if (m == MATCH_NO && ts->type != BT_CHARACTER)
2373 m = gfc_match_old_kind_spec (ts);
2375 /* Defer association of the KIND expression of function results
2376 until after USE and IMPORT statements. */
2377 if ((gfc_current_state () == COMP_NONE && gfc_error_flag_test ())
2378 || gfc_matching_function)
2382 m = MATCH_YES; /* No kind specifier found. */
2388 /* Match an IMPLICIT NONE statement. Actually, this statement is
2389 already matched in parse.c, or we would not end up here in the
2390 first place. So the only thing we need to check, is if there is
2391 trailing garbage. If not, the match is successful. */
2394 gfc_match_implicit_none (void)
2396 return (gfc_match_eos () == MATCH_YES) ? MATCH_YES : MATCH_NO;
2400 /* Match the letter range(s) of an IMPLICIT statement. */
2403 match_implicit_range (void)
2409 cur_loc = gfc_current_locus;
2411 gfc_gobble_whitespace ();
2412 c = gfc_next_ascii_char ();
2415 gfc_error ("Missing character range in IMPLICIT at %C");
2422 gfc_gobble_whitespace ();
2423 c1 = gfc_next_ascii_char ();
2427 gfc_gobble_whitespace ();
2428 c = gfc_next_ascii_char ();
2433 inner = 0; /* Fall through. */
2440 gfc_gobble_whitespace ();
2441 c2 = gfc_next_ascii_char ();
2445 gfc_gobble_whitespace ();
2446 c = gfc_next_ascii_char ();
2448 if ((c != ',') && (c != ')'))
2461 gfc_error ("Letters must be in alphabetic order in "
2462 "IMPLICIT statement at %C");
2466 /* See if we can add the newly matched range to the pending
2467 implicits from this IMPLICIT statement. We do not check for
2468 conflicts with whatever earlier IMPLICIT statements may have
2469 set. This is done when we've successfully finished matching
2471 if (gfc_add_new_implicit_range (c1, c2) != SUCCESS)
2478 gfc_syntax_error (ST_IMPLICIT);
2480 gfc_current_locus = cur_loc;
2485 /* Match an IMPLICIT statement, storing the types for
2486 gfc_set_implicit() if the statement is accepted by the parser.
2487 There is a strange looking, but legal syntactic construction
2488 possible. It looks like:
2490 IMPLICIT INTEGER (a-b) (c-d)
2492 This is legal if "a-b" is a constant expression that happens to
2493 equal one of the legal kinds for integers. The real problem
2494 happens with an implicit specification that looks like:
2496 IMPLICIT INTEGER (a-b)
2498 In this case, a typespec matcher that is "greedy" (as most of the
2499 matchers are) gobbles the character range as a kindspec, leaving
2500 nothing left. We therefore have to go a bit more slowly in the
2501 matching process by inhibiting the kindspec checking during
2502 typespec matching and checking for a kind later. */
2505 gfc_match_implicit (void)
2514 /* We don't allow empty implicit statements. */
2515 if (gfc_match_eos () == MATCH_YES)
2517 gfc_error ("Empty IMPLICIT statement at %C");
2523 /* First cleanup. */
2524 gfc_clear_new_implicit ();
2526 /* A basic type is mandatory here. */
2527 m = gfc_match_type_spec (&ts, 1);
2528 if (m == MATCH_ERROR)
2533 cur_loc = gfc_current_locus;
2534 m = match_implicit_range ();
2538 /* We may have <TYPE> (<RANGE>). */
2539 gfc_gobble_whitespace ();
2540 c = gfc_next_ascii_char ();
2541 if ((c == '\n') || (c == ','))
2543 /* Check for CHARACTER with no length parameter. */
2544 if (ts.type == BT_CHARACTER && !ts.cl)
2546 ts.kind = gfc_default_character_kind;
2547 ts.cl = gfc_get_charlen ();
2548 ts.cl->next = gfc_current_ns->cl_list;
2549 gfc_current_ns->cl_list = ts.cl;
2550 ts.cl->length = gfc_int_expr (1);
2553 /* Record the Successful match. */
2554 if (gfc_merge_new_implicit (&ts) != SUCCESS)
2559 gfc_current_locus = cur_loc;
2562 /* Discard the (incorrectly) matched range. */
2563 gfc_clear_new_implicit ();
2565 /* Last chance -- check <TYPE> <SELECTOR> (<RANGE>). */
2566 if (ts.type == BT_CHARACTER)
2567 m = match_char_spec (&ts);
2570 m = gfc_match_kind_spec (&ts, false);
2573 m = gfc_match_old_kind_spec (&ts);
2574 if (m == MATCH_ERROR)
2580 if (m == MATCH_ERROR)
2583 m = match_implicit_range ();
2584 if (m == MATCH_ERROR)
2589 gfc_gobble_whitespace ();
2590 c = gfc_next_ascii_char ();
2591 if ((c != '\n') && (c != ','))
2594 if (gfc_merge_new_implicit (&ts) != SUCCESS)
2602 gfc_syntax_error (ST_IMPLICIT);
2610 gfc_match_import (void)
2612 char name[GFC_MAX_SYMBOL_LEN + 1];
2617 if (gfc_current_ns->proc_name == NULL
2618 || gfc_current_ns->proc_name->attr.if_source != IFSRC_IFBODY)
2620 gfc_error ("IMPORT statement at %C only permitted in "
2621 "an INTERFACE body");
2625 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IMPORT statement at %C")
2629 if (gfc_match_eos () == MATCH_YES)
2631 /* All host variables should be imported. */
2632 gfc_current_ns->has_import_set = 1;
2636 if (gfc_match (" ::") == MATCH_YES)
2638 if (gfc_match_eos () == MATCH_YES)
2640 gfc_error ("Expecting list of named entities at %C");
2647 m = gfc_match (" %n", name);
2651 if (gfc_current_ns->parent != NULL
2652 && gfc_find_symbol (name, gfc_current_ns->parent, 1, &sym))
2654 gfc_error ("Type name '%s' at %C is ambiguous", name);
2657 else if (gfc_current_ns->proc_name->ns->parent != NULL
2658 && gfc_find_symbol (name,
2659 gfc_current_ns->proc_name->ns->parent,
2662 gfc_error ("Type name '%s' at %C is ambiguous", name);
2668 gfc_error ("Cannot IMPORT '%s' from host scoping unit "
2669 "at %C - does not exist.", name);
2673 if (gfc_find_symtree (gfc_current_ns->sym_root,name))
2675 gfc_warning ("'%s' is already IMPORTed from host scoping unit "
2680 st = gfc_new_symtree (&gfc_current_ns->sym_root, name);
2683 sym->attr.imported = 1;
2695 if (gfc_match_eos () == MATCH_YES)
2697 if (gfc_match_char (',') != MATCH_YES)
2704 gfc_error ("Syntax error in IMPORT statement at %C");
2709 /* A minimal implementation of gfc_match without whitespace, escape
2710 characters or variable arguments. Returns true if the next
2711 characters match the TARGET template exactly. */
2714 match_string_p (const char *target)
2718 for (p = target; *p; p++)
2719 if ((char) gfc_next_ascii_char () != *p)
2724 /* Matches an attribute specification including array specs. If
2725 successful, leaves the variables current_attr and current_as
2726 holding the specification. Also sets the colon_seen variable for
2727 later use by matchers associated with initializations.
2729 This subroutine is a little tricky in the sense that we don't know
2730 if we really have an attr-spec until we hit the double colon.
2731 Until that time, we can only return MATCH_NO. This forces us to
2732 check for duplicate specification at this level. */
2735 match_attr_spec (void)
2737 /* Modifiers that can exist in a type statement. */
2739 { GFC_DECL_BEGIN = 0,
2740 DECL_ALLOCATABLE = GFC_DECL_BEGIN, DECL_DIMENSION, DECL_EXTERNAL,
2741 DECL_IN, DECL_OUT, DECL_INOUT, DECL_INTRINSIC, DECL_OPTIONAL,
2742 DECL_PARAMETER, DECL_POINTER, DECL_PROTECTED, DECL_PRIVATE,
2743 DECL_PUBLIC, DECL_SAVE, DECL_TARGET, DECL_VALUE, DECL_VOLATILE,
2744 DECL_IS_BIND_C, DECL_NONE,
2745 GFC_DECL_END /* Sentinel */
2749 /* GFC_DECL_END is the sentinel, index starts at 0. */
2750 #define NUM_DECL GFC_DECL_END
2752 locus start, seen_at[NUM_DECL];
2759 gfc_clear_attr (¤t_attr);
2760 start = gfc_current_locus;
2765 /* See if we get all of the keywords up to the final double colon. */
2766 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
2774 gfc_gobble_whitespace ();
2776 ch = gfc_next_ascii_char ();
2779 /* This is the successful exit condition for the loop. */
2780 if (gfc_next_ascii_char () == ':')
2785 gfc_gobble_whitespace ();
2786 switch (gfc_peek_ascii_char ())
2789 if (match_string_p ("allocatable"))
2790 d = DECL_ALLOCATABLE;
2794 /* Try and match the bind(c). */
2795 m = gfc_match_bind_c (NULL, true);
2798 else if (m == MATCH_ERROR)
2803 if (match_string_p ("dimension"))
2808 if (match_string_p ("external"))
2813 if (match_string_p ("int"))
2815 ch = gfc_next_ascii_char ();
2818 if (match_string_p ("nt"))
2820 /* Matched "intent". */
2821 /* TODO: Call match_intent_spec from here. */
2822 if (gfc_match (" ( in out )") == MATCH_YES)
2824 else if (gfc_match (" ( in )") == MATCH_YES)
2826 else if (gfc_match (" ( out )") == MATCH_YES)
2832 if (match_string_p ("insic"))
2834 /* Matched "intrinsic". */
2842 if (match_string_p ("optional"))
2847 gfc_next_ascii_char ();
2848 switch (gfc_next_ascii_char ())
2851 if (match_string_p ("rameter"))
2853 /* Matched "parameter". */
2859 if (match_string_p ("inter"))
2861 /* Matched "pointer". */
2867 ch = gfc_next_ascii_char ();
2870 if (match_string_p ("vate"))
2872 /* Matched "private". */
2878 if (match_string_p ("tected"))
2880 /* Matched "protected". */
2887 if (match_string_p ("blic"))
2889 /* Matched "public". */
2897 if (match_string_p ("save"))
2902 if (match_string_p ("target"))
2907 gfc_next_ascii_char ();
2908 ch = gfc_next_ascii_char ();
2911 if (match_string_p ("lue"))
2913 /* Matched "value". */
2919 if (match_string_p ("latile"))
2921 /* Matched "volatile". */
2929 /* No double colon and no recognizable decl_type, so assume that
2930 we've been looking at something else the whole time. */
2938 seen_at[d] = gfc_current_locus;
2940 if (d == DECL_DIMENSION)
2942 m = gfc_match_array_spec (¤t_as);
2946 gfc_error ("Missing dimension specification at %C");
2950 if (m == MATCH_ERROR)
2955 /* Since we've seen a double colon, we have to be looking at an
2956 attr-spec. This means that we can now issue errors. */
2957 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
2962 case DECL_ALLOCATABLE:
2963 attr = "ALLOCATABLE";
2965 case DECL_DIMENSION:
2972 attr = "INTENT (IN)";
2975 attr = "INTENT (OUT)";
2978 attr = "INTENT (IN OUT)";
2980 case DECL_INTRINSIC:
2986 case DECL_PARAMETER:
2992 case DECL_PROTECTED:
3007 case DECL_IS_BIND_C:
3017 attr = NULL; /* This shouldn't happen. */
3020 gfc_error ("Duplicate %s attribute at %L", attr, &seen_at[d]);
3025 /* Now that we've dealt with duplicate attributes, add the attributes
3026 to the current attribute. */
3027 for (d = GFC_DECL_BEGIN; d != GFC_DECL_END; d++)
3032 if (gfc_current_state () == COMP_DERIVED
3033 && d != DECL_DIMENSION && d != DECL_POINTER
3034 && d != DECL_PRIVATE && d != DECL_PUBLIC
3037 if (d == DECL_ALLOCATABLE)
3039 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ALLOCATABLE "
3040 "attribute at %C in a TYPE definition")
3049 gfc_error ("Attribute at %L is not allowed in a TYPE definition",
3056 if ((d == DECL_PRIVATE || d == DECL_PUBLIC)
3057 && gfc_current_state () != COMP_MODULE)
3059 if (d == DECL_PRIVATE)
3063 if (gfc_current_state () == COMP_DERIVED
3064 && gfc_state_stack->previous
3065 && gfc_state_stack->previous->state == COMP_MODULE)
3067 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: Attribute %s "
3068 "at %L in a TYPE definition", attr,
3078 gfc_error ("%s attribute at %L is not allowed outside of the "
3079 "specification part of a module", attr, &seen_at[d]);
3087 case DECL_ALLOCATABLE:
3088 t = gfc_add_allocatable (¤t_attr, &seen_at[d]);
3091 case DECL_DIMENSION:
3092 t = gfc_add_dimension (¤t_attr, NULL, &seen_at[d]);
3096 t = gfc_add_external (¤t_attr, &seen_at[d]);
3100 t = gfc_add_intent (¤t_attr, INTENT_IN, &seen_at[d]);
3104 t = gfc_add_intent (¤t_attr, INTENT_OUT, &seen_at[d]);
3108 t = gfc_add_intent (¤t_attr, INTENT_INOUT, &seen_at[d]);
3111 case DECL_INTRINSIC:
3112 t = gfc_add_intrinsic (¤t_attr, &seen_at[d]);
3116 t = gfc_add_optional (¤t_attr, &seen_at[d]);
3119 case DECL_PARAMETER:
3120 t = gfc_add_flavor (¤t_attr, FL_PARAMETER, NULL, &seen_at[d]);
3124 t = gfc_add_pointer (¤t_attr, &seen_at[d]);
3127 case DECL_PROTECTED:
3128 if (gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
3130 gfc_error ("PROTECTED at %C only allowed in specification "
3131 "part of a module");
3136 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PROTECTED "
3141 t = gfc_add_protected (¤t_attr, NULL, &seen_at[d]);
3145 t = gfc_add_access (¤t_attr, ACCESS_PRIVATE, NULL,
3150 t = gfc_add_access (¤t_attr, ACCESS_PUBLIC, NULL,
3155 t = gfc_add_save (¤t_attr, NULL, &seen_at[d]);
3159 t = gfc_add_target (¤t_attr, &seen_at[d]);
3162 case DECL_IS_BIND_C:
3163 t = gfc_add_is_bind_c(¤t_attr, NULL, &seen_at[d], 0);
3167 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: VALUE attribute "
3172 t = gfc_add_value (¤t_attr, NULL, &seen_at[d]);
3176 if (gfc_notify_std (GFC_STD_F2003,
3177 "Fortran 2003: VOLATILE attribute at %C")
3181 t = gfc_add_volatile (¤t_attr, NULL, &seen_at[d]);
3185 gfc_internal_error ("match_attr_spec(): Bad attribute");
3199 gfc_current_locus = start;
3200 gfc_free_array_spec (current_as);
3206 /* Set the binding label, dest_label, either with the binding label
3207 stored in the given gfc_typespec, ts, or if none was provided, it
3208 will be the symbol name in all lower case, as required by the draft
3209 (J3/04-007, section 15.4.1). If a binding label was given and
3210 there is more than one argument (num_idents), it is an error. */
3213 set_binding_label (char *dest_label, const char *sym_name, int num_idents)
3215 if (num_idents > 1 && has_name_equals)
3217 gfc_error ("Multiple identifiers provided with "
3218 "single NAME= specifier at %C");
3222 if (curr_binding_label[0] != '\0')
3224 /* Binding label given; store in temp holder til have sym. */
3225 strcpy (dest_label, curr_binding_label);
3229 /* No binding label given, and the NAME= specifier did not exist,
3230 which means there was no NAME="". */
3231 if (sym_name != NULL && has_name_equals == 0)
3232 strcpy (dest_label, sym_name);
3239 /* Set the status of the given common block as being BIND(C) or not,
3240 depending on the given parameter, is_bind_c. */
3243 set_com_block_bind_c (gfc_common_head *com_block, int is_bind_c)
3245 com_block->is_bind_c = is_bind_c;
3250 /* Verify that the given gfc_typespec is for a C interoperable type. */
3253 verify_c_interop (gfc_typespec *ts, const char *name, locus *where)
3257 /* Make sure the kind used is appropriate for the type.
3258 The f90_type is unknown if an integer constant was
3259 used (e.g., real(4), bind(c) :: myFloat). */
3260 if (ts->f90_type != BT_UNKNOWN)
3262 t = gfc_validate_c_kind (ts);
3265 /* Print an error, but continue parsing line. */
3266 gfc_error_now ("C kind parameter is for type %s but "
3267 "symbol '%s' at %L is of type %s",
3268 gfc_basic_typename (ts->f90_type),
3270 gfc_basic_typename (ts->type));
3274 /* Make sure the kind is C interoperable. This does not care about the
3275 possible error above. */
3276 if (ts->type == BT_DERIVED && ts->derived != NULL)
3277 return (ts->derived->ts.is_c_interop ? SUCCESS : FAILURE);
3278 else if (ts->is_c_interop != 1)
3285 /* Verify that the variables of a given common block, which has been
3286 defined with the attribute specifier bind(c), to be of a C
3287 interoperable type. Errors will be reported here, if
3291 verify_com_block_vars_c_interop (gfc_common_head *com_block)
3293 gfc_symbol *curr_sym = NULL;
3294 try retval = SUCCESS;
3296 curr_sym = com_block->head;
3298 /* Make sure we have at least one symbol. */
3299 if (curr_sym == NULL)
3302 /* Here we know we have a symbol, so we'll execute this loop
3306 /* The second to last param, 1, says this is in a common block. */
3307 retval = verify_bind_c_sym (curr_sym, &(curr_sym->ts), 1, com_block);
3308 curr_sym = curr_sym->common_next;
3309 } while (curr_sym != NULL);
3315 /* Verify that a given BIND(C) symbol is C interoperable. If it is not,
3316 an appropriate error message is reported. */
3319 verify_bind_c_sym (gfc_symbol *tmp_sym, gfc_typespec *ts,
3320 int is_in_common, gfc_common_head *com_block)
3322 try retval = SUCCESS;
3324 if (tmp_sym->attr.function && tmp_sym->result != NULL)
3326 tmp_sym = tmp_sym->result;
3327 /* Make sure it wasn't an implicitly typed result. */
3328 if (tmp_sym->attr.implicit_type)
3330 gfc_warning ("Implicitly declared BIND(C) function '%s' at "
3331 "%L may not be C interoperable", tmp_sym->name,
3332 &tmp_sym->declared_at);
3333 tmp_sym->ts.f90_type = tmp_sym->ts.type;
3334 /* Mark it as C interoperable to prevent duplicate warnings. */
3335 tmp_sym->ts.is_c_interop = 1;
3336 tmp_sym->attr.is_c_interop = 1;
3340 /* Here, we know we have the bind(c) attribute, so if we have
3341 enough type info, then verify that it's a C interop kind.
3342 The info could be in the symbol already, or possibly still in
3343 the given ts (current_ts), so look in both. */
3344 if (tmp_sym->ts.type != BT_UNKNOWN || ts->type != BT_UNKNOWN)
3346 if (verify_c_interop (&(tmp_sym->ts), tmp_sym->name,
3347 &(tmp_sym->declared_at)) != SUCCESS)
3349 /* See if we're dealing with a sym in a common block or not. */
3350 if (is_in_common == 1)
3352 gfc_warning ("Variable '%s' in common block '%s' at %L "
3353 "may not be a C interoperable "
3354 "kind though common block '%s' is BIND(C)",
3355 tmp_sym->name, com_block->name,
3356 &(tmp_sym->declared_at), com_block->name);
3360 if (tmp_sym->ts.type == BT_DERIVED || ts->type == BT_DERIVED)
3361 gfc_error ("Type declaration '%s' at %L is not C "
3362 "interoperable but it is BIND(C)",
3363 tmp_sym->name, &(tmp_sym->declared_at));
3365 gfc_warning ("Variable '%s' at %L "
3366 "may not be a C interoperable "
3367 "kind but it is bind(c)",
3368 tmp_sym->name, &(tmp_sym->declared_at));
3372 /* Variables declared w/in a common block can't be bind(c)
3373 since there's no way for C to see these variables, so there's
3374 semantically no reason for the attribute. */
3375 if (is_in_common == 1 && tmp_sym->attr.is_bind_c == 1)
3377 gfc_error ("Variable '%s' in common block '%s' at "
3378 "%L cannot be declared with BIND(C) "
3379 "since it is not a global",
3380 tmp_sym->name, com_block->name,
3381 &(tmp_sym->declared_at));
3385 /* Scalar variables that are bind(c) can not have the pointer
3386 or allocatable attributes. */
3387 if (tmp_sym->attr.is_bind_c == 1)
3389 if (tmp_sym->attr.pointer == 1)
3391 gfc_error ("Variable '%s' at %L cannot have both the "
3392 "POINTER and BIND(C) attributes",
3393 tmp_sym->name, &(tmp_sym->declared_at));
3397 if (tmp_sym->attr.allocatable == 1)
3399 gfc_error ("Variable '%s' at %L cannot have both the "
3400 "ALLOCATABLE and BIND(C) attributes",
3401 tmp_sym->name, &(tmp_sym->declared_at));
3405 /* If it is a BIND(C) function, make sure the return value is a
3406 scalar value. The previous tests in this function made sure
3407 the type is interoperable. */
3408 if (tmp_sym->attr.function == 1 && tmp_sym->as != NULL)
3409 gfc_error ("Return type of BIND(C) function '%s' at %L cannot "
3410 "be an array", tmp_sym->name, &(tmp_sym->declared_at));
3412 /* BIND(C) functions can not return a character string. */
3413 if (tmp_sym->attr.function == 1 && tmp_sym->ts.type == BT_CHARACTER)
3414 if (tmp_sym->ts.cl == NULL || tmp_sym->ts.cl->length == NULL
3415 || tmp_sym->ts.cl->length->expr_type != EXPR_CONSTANT
3416 || mpz_cmp_si (tmp_sym->ts.cl->length->value.integer, 1) != 0)
3417 gfc_error ("Return type of BIND(C) function '%s' at %L cannot "
3418 "be a character string", tmp_sym->name,
3419 &(tmp_sym->declared_at));
3423 /* See if the symbol has been marked as private. If it has, make sure
3424 there is no binding label and warn the user if there is one. */
3425 if (tmp_sym->attr.access == ACCESS_PRIVATE
3426 && tmp_sym->binding_label[0] != '\0')
3427 /* Use gfc_warning_now because we won't say that the symbol fails
3428 just because of this. */
3429 gfc_warning_now ("Symbol '%s' at %L is marked PRIVATE but has been "
3430 "given the binding label '%s'", tmp_sym->name,
3431 &(tmp_sym->declared_at), tmp_sym->binding_label);
3437 /* Set the appropriate fields for a symbol that's been declared as
3438 BIND(C) (the is_bind_c flag and the binding label), and verify that
3439 the type is C interoperable. Errors are reported by the functions
3440 used to set/test these fields. */
3443 set_verify_bind_c_sym (gfc_symbol *tmp_sym, int num_idents)
3445 try retval = SUCCESS;
3447 /* TODO: Do we need to make sure the vars aren't marked private? */
3449 /* Set the is_bind_c bit in symbol_attribute. */
3450 gfc_add_is_bind_c (&(tmp_sym->attr), tmp_sym->name, &gfc_current_locus, 0);
3452 if (set_binding_label (tmp_sym->binding_label, tmp_sym->name,
3453 num_idents) != SUCCESS)
3460 /* Set the fields marking the given common block as BIND(C), including
3461 a binding label, and report any errors encountered. */
3464 set_verify_bind_c_com_block (gfc_common_head *com_block, int num_idents)
3466 try retval = SUCCESS;
3468 /* destLabel, common name, typespec (which may have binding label). */
3469 if (set_binding_label (com_block->binding_label, com_block->name, num_idents)
3473 /* Set the given common block (com_block) to being bind(c) (1). */
3474 set_com_block_bind_c (com_block, 1);
3480 /* Retrieve the list of one or more identifiers that the given bind(c)
3481 attribute applies to. */
3484 get_bind_c_idents (void)
3486 char name[GFC_MAX_SYMBOL_LEN + 1];
3488 gfc_symbol *tmp_sym = NULL;
3490 gfc_common_head *com_block = NULL;
3492 if (gfc_match_name (name) == MATCH_YES)
3494 found_id = MATCH_YES;
3495 gfc_get_ha_symbol (name, &tmp_sym);
3497 else if (match_common_name (name) == MATCH_YES)
3499 found_id = MATCH_YES;
3500 com_block = gfc_get_common (name, 0);
3504 gfc_error ("Need either entity or common block name for "
3505 "attribute specification statement at %C");
3509 /* Save the current identifier and look for more. */
3512 /* Increment the number of identifiers found for this spec stmt. */
3515 /* Make sure we have a sym or com block, and verify that it can
3516 be bind(c). Set the appropriate field(s) and look for more
3518 if (tmp_sym != NULL || com_block != NULL)
3520 if (tmp_sym != NULL)
3522 if (set_verify_bind_c_sym (tmp_sym, num_idents)
3528 if (set_verify_bind_c_com_block(com_block, num_idents)
3533 /* Look to see if we have another identifier. */
3535 if (gfc_match_eos () == MATCH_YES)
3536 found_id = MATCH_NO;
3537 else if (gfc_match_char (',') != MATCH_YES)
3538 found_id = MATCH_NO;
3539 else if (gfc_match_name (name) == MATCH_YES)
3541 found_id = MATCH_YES;
3542 gfc_get_ha_symbol (name, &tmp_sym);
3544 else if (match_common_name (name) == MATCH_YES)
3546 found_id = MATCH_YES;
3547 com_block = gfc_get_common (name, 0);
3551 gfc_error ("Missing entity or common block name for "
3552 "attribute specification statement at %C");
3558 gfc_internal_error ("Missing symbol");
3560 } while (found_id == MATCH_YES);
3562 /* if we get here we were successful */
3567 /* Try and match a BIND(C) attribute specification statement. */
3570 gfc_match_bind_c_stmt (void)
3572 match found_match = MATCH_NO;
3577 /* This may not be necessary. */
3579 /* Clear the temporary binding label holder. */
3580 curr_binding_label[0] = '\0';
3582 /* Look for the bind(c). */
3583 found_match = gfc_match_bind_c (NULL, true);
3585 if (found_match == MATCH_YES)
3587 /* Look for the :: now, but it is not required. */
3590 /* Get the identifier(s) that needs to be updated. This may need to
3591 change to hand the flag(s) for the attr specified so all identifiers
3592 found can have all appropriate parts updated (assuming that the same
3593 spec stmt can have multiple attrs, such as both bind(c) and
3595 if (get_bind_c_idents () != SUCCESS)
3596 /* Error message should have printed already. */
3604 /* Match a data declaration statement. */
3607 gfc_match_data_decl (void)
3613 num_idents_on_line = 0;
3615 m = gfc_match_type_spec (¤t_ts, 0);
3619 if (current_ts.type == BT_DERIVED && gfc_current_state () != COMP_DERIVED)
3621 sym = gfc_use_derived (current_ts.derived);
3629 current_ts.derived = sym;
3632 m = match_attr_spec ();
3633 if (m == MATCH_ERROR)
3639 if (current_ts.type == BT_DERIVED && current_ts.derived->components == NULL
3640 && !current_ts.derived->attr.zero_comp)
3643 if (current_attr.pointer && gfc_current_state () == COMP_DERIVED)
3646 gfc_find_symbol (current_ts.derived->name,
3647 current_ts.derived->ns->parent, 1, &sym);
3649 /* Any symbol that we find had better be a type definition
3650 which has its components defined. */
3651 if (sym != NULL && sym->attr.flavor == FL_DERIVED
3652 && (current_ts.derived->components != NULL
3653 || current_ts.derived->attr.zero_comp))
3656 /* Now we have an error, which we signal, and then fix up
3657 because the knock-on is plain and simple confusing. */
3658 gfc_error_now ("Derived type at %C has not been previously defined "
3659 "and so cannot appear in a derived type definition");
3660 current_attr.pointer = 1;
3665 /* If we have an old-style character declaration, and no new-style
3666 attribute specifications, then there a comma is optional between
3667 the type specification and the variable list. */
3668 if (m == MATCH_NO && current_ts.type == BT_CHARACTER && old_char_selector)
3669 gfc_match_char (',');
3671 /* Give the types/attributes to symbols that follow. Give the element
3672 a number so that repeat character length expressions can be copied. */
3676 num_idents_on_line++;
3677 m = variable_decl (elem++);
3678 if (m == MATCH_ERROR)
3683 if (gfc_match_eos () == MATCH_YES)
3685 if (gfc_match_char (',') != MATCH_YES)
3689 if (gfc_error_flag_test () == 0)
3690 gfc_error ("Syntax error in data declaration at %C");
3693 gfc_free_data_all (gfc_current_ns);
3696 gfc_free_array_spec (current_as);
3702 /* Match a prefix associated with a function or subroutine
3703 declaration. If the typespec pointer is nonnull, then a typespec
3704 can be matched. Note that if nothing matches, MATCH_YES is
3705 returned (the null string was matched). */
3708 gfc_match_prefix (gfc_typespec *ts)
3712 gfc_clear_attr (¤t_attr);
3716 if (!seen_type && ts != NULL
3717 && gfc_match_type_spec (ts, 0) == MATCH_YES
3718 && gfc_match_space () == MATCH_YES)
3725 if (gfc_match ("elemental% ") == MATCH_YES)
3727 if (gfc_add_elemental (¤t_attr, NULL) == FAILURE)
3733 if (gfc_match ("pure% ") == MATCH_YES)
3735 if (gfc_add_pure (¤t_attr, NULL) == FAILURE)
3741 if (gfc_match ("recursive% ") == MATCH_YES)
3743 if (gfc_add_recursive (¤t_attr, NULL) == FAILURE)
3749 /* At this point, the next item is not a prefix. */
3754 /* Copy attributes matched by gfc_match_prefix() to attributes on a symbol. */
3757 copy_prefix (symbol_attribute *dest, locus *where)
3759 if (current_attr.pure && gfc_add_pure (dest, where) == FAILURE)
3762 if (current_attr.elemental && gfc_add_elemental (dest, where) == FAILURE)
3765 if (current_attr.recursive && gfc_add_recursive (dest, where) == FAILURE)
3772 /* Match a formal argument list. */
3775 gfc_match_formal_arglist (gfc_symbol *progname, int st_flag, int null_flag)
3777 gfc_formal_arglist *head, *tail, *p, *q;
3778 char name[GFC_MAX_SYMBOL_LEN + 1];
3784 if (gfc_match_char ('(') != MATCH_YES)
3791 if (gfc_match_char (')') == MATCH_YES)
3796 if (gfc_match_char ('*') == MATCH_YES)
3800 m = gfc_match_name (name);
3804 if (gfc_get_symbol (name, NULL, &sym))
3808 p = gfc_get_formal_arglist ();
3820 /* We don't add the VARIABLE flavor because the name could be a
3821 dummy procedure. We don't apply these attributes to formal
3822 arguments of statement functions. */
3823 if (sym != NULL && !st_flag
3824 && (gfc_add_dummy (&sym->attr, sym->name, NULL) == FAILURE
3825 || gfc_missing_attr (&sym->attr, NULL) == FAILURE))
3831 /* The name of a program unit can be in a different namespace,
3832 so check for it explicitly. After the statement is accepted,
3833 the name is checked for especially in gfc_get_symbol(). */
3834 if (gfc_new_block != NULL && sym != NULL
3835 && strcmp (sym->name, gfc_new_block->name) == 0)
3837 gfc_error ("Name '%s' at %C is the name of the procedure",
3843 if (gfc_match_char (')') == MATCH_YES)
3846 m = gfc_match_char (',');
3849 gfc_error ("Unexpected junk in formal argument list at %C");
3855 /* Check for duplicate symbols in the formal argument list. */
3858 for (p = head; p->next; p = p->next)
3863 for (q = p->next; q; q = q->next)
3864 if (p->sym == q->sym)
3866 gfc_error ("Duplicate symbol '%s' in formal argument list "
3867 "at %C", p->sym->name);
3875 if (gfc_add_explicit_interface (progname, IFSRC_DECL, head, NULL)
3885 gfc_free_formal_arglist (head);
3890 /* Match a RESULT specification following a function declaration or
3891 ENTRY statement. Also matches the end-of-statement. */
3894 match_result (gfc_symbol *function, gfc_symbol **result)
3896 char name[GFC_MAX_SYMBOL_LEN + 1];
3900 if (gfc_match (" result (") != MATCH_YES)
3903 m = gfc_match_name (name);
3907 /* Get the right paren, and that's it because there could be the
3908 bind(c) attribute after the result clause. */
3909 if (gfc_match_char(')') != MATCH_YES)
3911 /* TODO: should report the missing right paren here. */
3915 if (strcmp (function->name, name) == 0)
3917 gfc_error ("RESULT variable at %C must be different than function name");
3921 if (gfc_get_symbol (name, NULL, &r))
3924 if (gfc_add_flavor (&r->attr, FL_VARIABLE, r->name, NULL) == FAILURE
3925 || gfc_add_result (&r->attr, r->name, NULL) == FAILURE)
3934 /* Match a function suffix, which could be a combination of a result
3935 clause and BIND(C), either one, or neither. The draft does not
3936 require them to come in a specific order. */
3939 gfc_match_suffix (gfc_symbol *sym, gfc_symbol **result)
3941 match is_bind_c; /* Found bind(c). */
3942 match is_result; /* Found result clause. */
3943 match found_match; /* Status of whether we've found a good match. */
3944 char peek_char; /* Character we're going to peek at. */
3945 bool allow_binding_name;
3947 /* Initialize to having found nothing. */
3948 found_match = MATCH_NO;
3949 is_bind_c = MATCH_NO;
3950 is_result = MATCH_NO;
3952 /* Get the next char to narrow between result and bind(c). */
3953 gfc_gobble_whitespace ();
3954 peek_char = gfc_peek_ascii_char ();
3956 /* C binding names are not allowed for internal procedures. */
3957 if (gfc_current_state () == COMP_CONTAINS
3958 && sym->ns->proc_name->attr.flavor != FL_MODULE)
3959 allow_binding_name = false;
3961 allow_binding_name = true;
3966 /* Look for result clause. */
3967 is_result = match_result (sym, result);
3968 if (is_result == MATCH_YES)
3970 /* Now see if there is a bind(c) after it. */
3971 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
3972 /* We've found the result clause and possibly bind(c). */
3973 found_match = MATCH_YES;
3976 /* This should only be MATCH_ERROR. */
3977 found_match = is_result;
3980 /* Look for bind(c) first. */
3981 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
3982 if (is_bind_c == MATCH_YES)
3984 /* Now see if a result clause followed it. */
3985 is_result = match_result (sym, result);
3986 found_match = MATCH_YES;
3990 /* Should only be a MATCH_ERROR if we get here after seeing 'b'. */
3991 found_match = MATCH_ERROR;
3995 gfc_error ("Unexpected junk after function declaration at %C");
3996 found_match = MATCH_ERROR;
4000 if (is_bind_c == MATCH_YES)
4002 /* Fortran 2008 draft allows BIND(C) for internal procedures. */
4003 if (gfc_current_state () == COMP_CONTAINS
4004 && sym->ns->proc_name->attr.flavor != FL_MODULE
4005 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BIND(C) attribute "
4006 "at %L may not be specified for an internal "
4007 "procedure", &gfc_current_locus)
4011 if (gfc_add_is_bind_c (&(sym->attr), sym->name, &gfc_current_locus, 1)
4020 /* Match a PROCEDURE declaration (R1211). */
4023 match_procedure_decl (void)
4026 locus old_loc, entry_loc;
4027 gfc_symbol *sym, *proc_if = NULL;
4030 old_loc = entry_loc = gfc_current_locus;
4032 gfc_clear_ts (¤t_ts);
4034 if (gfc_match (" (") != MATCH_YES)
4036 gfc_current_locus = entry_loc;
4040 /* Get the type spec. for the procedure interface. */
4041 old_loc = gfc_current_locus;
4042 m = gfc_match_type_spec (¤t_ts, 0);
4043 if (m == MATCH_YES || (m == MATCH_NO && gfc_peek_ascii_char () == ')'))
4046 if (m == MATCH_ERROR)
4049 gfc_current_locus = old_loc;
4051 /* Get the name of the procedure or abstract interface
4052 to inherit the interface from. */
4053 m = gfc_match_symbol (&proc_if, 1);
4057 else if (m == MATCH_ERROR)
4060 /* Various interface checks. */
4063 /* Resolve interface if possible. That way, attr.procedure is only set
4064 if it is declared by a later procedure-declaration-stmt, which is
4065 invalid per C1212. */
4066 while (proc_if->ts.interface)
4067 proc_if = proc_if->ts.interface;
4069 if (proc_if->generic)
4071 gfc_error ("Interface '%s' at %C may not be generic", proc_if->name);
4074 if (proc_if->attr.proc == PROC_ST_FUNCTION)
4076 gfc_error ("Interface '%s' at %C may not be a statement function",
4080 /* Handle intrinsic procedures. */
4081 if (gfc_intrinsic_name (proc_if->name, 0)
4082 || gfc_intrinsic_name (proc_if->name, 1))
4083 proc_if->attr.intrinsic = 1;
4084 if (proc_if->attr.intrinsic
4085 && !gfc_intrinsic_actual_ok (proc_if->name, 0))
4087 gfc_error ("Intrinsic procedure '%s' not allowed "
4088 "in PROCEDURE statement at %C", proc_if->name);
4094 if (gfc_match (" )") != MATCH_YES)
4096 gfc_current_locus = entry_loc;
4100 /* Parse attributes. */
4101 m = match_attr_spec();
4102 if (m == MATCH_ERROR)
4105 /* Get procedure symbols. */
4108 m = gfc_match_symbol (&sym, 0);
4111 else if (m == MATCH_ERROR)
4114 /* Add current_attr to the symbol attributes. */
4115 if (gfc_copy_attr (&sym->attr, ¤t_attr, NULL) == FAILURE)
4118 if (sym->attr.is_bind_c)
4120 /* Check for C1218. */
4121 if (!proc_if || !proc_if->attr.is_bind_c)
4123 gfc_error ("BIND(C) attribute at %C requires "
4124 "an interface with BIND(C)");
4127 /* Check for C1217. */
4128 if (has_name_equals && sym->attr.pointer)
4130 gfc_error ("BIND(C) procedure with NAME may not have "
4131 "POINTER attribute at %C");
4134 if (has_name_equals && sym->attr.dummy)
4136 gfc_error ("Dummy procedure at %C may not have "
4137 "BIND(C) attribute with NAME");
4140 /* Set binding label for BIND(C). */
4141 if (set_binding_label (sym->binding_label, sym->name, num) != SUCCESS)
4145 if (!sym->attr.pointer && gfc_add_external (&sym->attr, NULL) == FAILURE)
4147 if (gfc_add_proc (&sym->attr, sym->name, NULL) == FAILURE)
4150 /* Set interface. */
4151 if (proc_if != NULL)
4153 sym->ts.interface = proc_if;
4154 sym->attr.untyped = 1;
4156 else if (current_ts.type != BT_UNKNOWN)
4158 sym->ts = current_ts;
4159 sym->ts.interface = gfc_new_symbol ("", gfc_current_ns);
4160 sym->ts.interface->ts = current_ts;
4161 sym->ts.interface->attr.function = 1;
4162 sym->attr.function = sym->ts.interface->attr.function;
4165 if (gfc_match_eos () == MATCH_YES)
4167 if (gfc_match_char (',') != MATCH_YES)
4172 gfc_error ("Syntax error in PROCEDURE statement at %C");
4177 /* Match a PROCEDURE declaration inside an interface (R1206). */
4180 match_procedure_in_interface (void)
4184 char name[GFC_MAX_SYMBOL_LEN + 1];
4186 if (current_interface.type == INTERFACE_NAMELESS
4187 || current_interface.type == INTERFACE_ABSTRACT)
4189 gfc_error ("PROCEDURE at %C must be in a generic interface");
4195 m = gfc_match_name (name);
4198 else if (m == MATCH_ERROR)
4200 if (gfc_get_symbol (name, gfc_current_ns->parent, &sym))
4203 if (gfc_add_interface (sym) == FAILURE)
4206 if (gfc_match_eos () == MATCH_YES)
4208 if (gfc_match_char (',') != MATCH_YES)
4215 gfc_error ("Syntax error in PROCEDURE statement at %C");
4220 /* General matcher for PROCEDURE declarations. */
4223 gfc_match_procedure (void)
4227 switch (gfc_current_state ())
4232 case COMP_SUBROUTINE:
4234 m = match_procedure_decl ();
4236 case COMP_INTERFACE:
4237 m = match_procedure_in_interface ();
4240 gfc_error ("Fortran 2003: Procedure components at %C are "
4241 "not yet implemented in gfortran");
4250 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PROCEDURE statement at %C")
4258 /* Match a function declaration. */
4261 gfc_match_function_decl (void)
4263 char name[GFC_MAX_SYMBOL_LEN + 1];
4264 gfc_symbol *sym, *result;
4268 match found_match; /* Status returned by match func. */
4270 if (gfc_current_state () != COMP_NONE
4271 && gfc_current_state () != COMP_INTERFACE
4272 && gfc_current_state () != COMP_CONTAINS)
4275 gfc_clear_ts (¤t_ts);
4277 old_loc = gfc_current_locus;
4279 m = gfc_match_prefix (¤t_ts);
4282 gfc_current_locus = old_loc;
4286 if (gfc_match ("function% %n", name) != MATCH_YES)
4288 gfc_current_locus = old_loc;
4291 if (get_proc_name (name, &sym, false))
4293 gfc_new_block = sym;
4295 m = gfc_match_formal_arglist (sym, 0, 0);
4298 gfc_error ("Expected formal argument list in function "
4299 "definition at %C");
4303 else if (m == MATCH_ERROR)
4308 /* According to the draft, the bind(c) and result clause can
4309 come in either order after the formal_arg_list (i.e., either
4310 can be first, both can exist together or by themselves or neither
4311 one). Therefore, the match_result can't match the end of the
4312 string, and check for the bind(c) or result clause in either order. */
4313 found_match = gfc_match_eos ();
4315 /* Make sure that it isn't already declared as BIND(C). If it is, it
4316 must have been marked BIND(C) with a BIND(C) attribute and that is
4317 not allowed for procedures. */
4318 if (sym->attr.is_bind_c == 1)
4320 sym->attr.is_bind_c = 0;
4321 if (sym->old_symbol != NULL)
4322 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4323 "variables or common blocks",
4324 &(sym->old_symbol->declared_at));
4326 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4327 "variables or common blocks", &gfc_current_locus);
4330 if (found_match != MATCH_YES)
4332 /* If we haven't found the end-of-statement, look for a suffix. */
4333 suffix_match = gfc_match_suffix (sym, &result);
4334 if (suffix_match == MATCH_YES)
4335 /* Need to get the eos now. */
4336 found_match = gfc_match_eos ();
4338 found_match = suffix_match;
4341 if(found_match != MATCH_YES)
4345 /* Make changes to the symbol. */
4348 if (gfc_add_function (&sym->attr, sym->name, NULL) == FAILURE)
4351 if (gfc_missing_attr (&sym->attr, NULL) == FAILURE
4352 || copy_prefix (&sym->attr, &sym->declared_at) == FAILURE)
4355 if (current_ts.type != BT_UNKNOWN && sym->ts.type != BT_UNKNOWN
4356 && !sym->attr.implicit_type)
4358 gfc_error ("Function '%s' at %C already has a type of %s", name,
4359 gfc_basic_typename (sym->ts.type));
4363 /* Delay matching the function characteristics until after the
4364 specification block by signalling kind=-1. */
4365 sym->declared_at = old_loc;
4366 if (current_ts.type != BT_UNKNOWN)
4367 current_ts.kind = -1;
4369 current_ts.kind = 0;
4373 sym->ts = current_ts;
4378 result->ts = current_ts;
4379 sym->result = result;
4386 gfc_current_locus = old_loc;
4391 /* This is mostly a copy of parse.c(add_global_procedure) but modified to
4392 pass the name of the entry, rather than the gfc_current_block name, and
4393 to return false upon finding an existing global entry. */
4396 add_global_entry (const char *name, int sub)
4401 s = gfc_get_gsymbol(name);
4402 type = sub ? GSYM_SUBROUTINE : GSYM_FUNCTION;
4405 || (s->type != GSYM_UNKNOWN
4406 && s->type != type))
4407 gfc_global_used(s, NULL);
4411 s->where = gfc_current_locus;
4419 /* Match an ENTRY statement. */
4422 gfc_match_entry (void)
4427 char name[GFC_MAX_SYMBOL_LEN + 1];
4428 gfc_compile_state state;
4432 bool module_procedure;
4436 m = gfc_match_name (name);
4440 state = gfc_current_state ();
4441 if (state != COMP_SUBROUTINE && state != COMP_FUNCTION)
4446 gfc_error ("ENTRY statement at %C cannot appear within a PROGRAM");
4449 gfc_error ("ENTRY statement at %C cannot appear within a MODULE");
4451 case COMP_BLOCK_DATA:
4452 gfc_error ("ENTRY statement at %C cannot appear within "
4455 case COMP_INTERFACE:
4456 gfc_error ("ENTRY statement at %C cannot appear within "
4460 gfc_error ("ENTRY statement at %C cannot appear within "
4461 "a DERIVED TYPE block");
4464 gfc_error ("ENTRY statement at %C cannot appear within "
4465 "an IF-THEN block");
4468 gfc_error ("ENTRY statement at %C cannot appear within "
4472 gfc_error ("ENTRY statement at %C cannot appear within "
4476 gfc_error ("ENTRY statement at %C cannot appear within "
4480 gfc_error ("ENTRY statement at %C cannot appear within "
4484 gfc_error ("ENTRY statement at %C cannot appear within "
4485 "a contained subprogram");
4488 gfc_internal_error ("gfc_match_entry(): Bad state");
4493 module_procedure = gfc_current_ns->parent != NULL
4494 && gfc_current_ns->parent->proc_name
4495 && gfc_current_ns->parent->proc_name->attr.flavor
4498 if (gfc_current_ns->parent != NULL
4499 && gfc_current_ns->parent->proc_name
4500 && !module_procedure)
4502 gfc_error("ENTRY statement at %C cannot appear in a "
4503 "contained procedure");
4507 /* Module function entries need special care in get_proc_name
4508 because previous references within the function will have
4509 created symbols attached to the current namespace. */
4510 if (get_proc_name (name, &entry,
4511 gfc_current_ns->parent != NULL
4513 && gfc_current_ns->proc_name->attr.function))
4516 proc = gfc_current_block ();
4518 /* Make sure that it isn't already declared as BIND(C). If it is, it
4519 must have been marked BIND(C) with a BIND(C) attribute and that is
4520 not allowed for procedures. */
4521 if (entry->attr.is_bind_c == 1)
4523 entry->attr.is_bind_c = 0;
4524 if (entry->old_symbol != NULL)
4525 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4526 "variables or common blocks",
4527 &(entry->old_symbol->declared_at));
4529 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4530 "variables or common blocks", &gfc_current_locus);
4533 /* Check what next non-whitespace character is so we can tell if there
4534 is the required parens if we have a BIND(C). */
4535 gfc_gobble_whitespace ();
4536 peek_char = gfc_peek_ascii_char ();
4538 if (state == COMP_SUBROUTINE)
4540 /* An entry in a subroutine. */
4541 if (!gfc_current_ns->parent && !add_global_entry (name, 1))
4544 m = gfc_match_formal_arglist (entry, 0, 1);
4548 /* Call gfc_match_bind_c with allow_binding_name = true as ENTRY can
4549 never be an internal procedure. */
4550 is_bind_c = gfc_match_bind_c (entry, true);
4551 if (is_bind_c == MATCH_ERROR)
4553 if (is_bind_c == MATCH_YES)
4555 if (peek_char != '(')
4557 gfc_error ("Missing required parentheses before BIND(C) at %C");
4560 if (gfc_add_is_bind_c (&(entry->attr), entry->name, &(entry->declared_at), 1)
4565 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
4566 || gfc_add_subroutine (&entry->attr, entry->name, NULL) == FAILURE)
4571 /* An entry in a function.
4572 We need to take special care because writing
4577 ENTRY f() RESULT (r)
4579 ENTRY f RESULT (r). */
4580 if (!gfc_current_ns->parent && !add_global_entry (name, 0))
4583 old_loc = gfc_current_locus;
4584 if (gfc_match_eos () == MATCH_YES)
4586 gfc_current_locus = old_loc;
4587 /* Match the empty argument list, and add the interface to
4589 m = gfc_match_formal_arglist (entry, 0, 1);
4592 m = gfc_match_formal_arglist (entry, 0, 0);
4599 if (gfc_match_eos () == MATCH_YES)
4601 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
4602 || gfc_add_function (&entry->attr, entry->name, NULL) == FAILURE)
4605 entry->result = entry;
4609 m = gfc_match_suffix (entry, &result);
4611 gfc_syntax_error (ST_ENTRY);
4617 if (gfc_add_result (&result->attr, result->name, NULL) == FAILURE
4618 || gfc_add_entry (&entry->attr, result->name, NULL) == FAILURE
4619 || gfc_add_function (&entry->attr, result->name, NULL)
4622 entry->result = result;
4626 if (gfc_add_entry (&entry->attr, entry->name, NULL) == FAILURE
4627 || gfc_add_function (&entry->attr, entry->name, NULL) == FAILURE)
4629 entry->result = entry;
4634 if (gfc_match_eos () != MATCH_YES)
4636 gfc_syntax_error (ST_ENTRY);
4640 entry->attr.recursive = proc->attr.recursive;
4641 entry->attr.elemental = proc->attr.elemental;
4642 entry->attr.pure = proc->attr.pure;
4644 el = gfc_get_entry_list ();
4646 el->next = gfc_current_ns->entries;
4647 gfc_current_ns->entries = el;
4649 el->id = el->next->id + 1;
4653 new_st.op = EXEC_ENTRY;
4654 new_st.ext.entry = el;
4660 /* Match a subroutine statement, including optional prefixes. */
4663 gfc_match_subroutine (void)
4665 char name[GFC_MAX_SYMBOL_LEN + 1];
4670 bool allow_binding_name;
4672 if (gfc_current_state () != COMP_NONE
4673 && gfc_current_state () != COMP_INTERFACE
4674 && gfc_current_state () != COMP_CONTAINS)
4677 m = gfc_match_prefix (NULL);
4681 m = gfc_match ("subroutine% %n", name);
4685 if (get_proc_name (name, &sym, false))
4687 gfc_new_block = sym;
4689 /* Check what next non-whitespace character is so we can tell if there
4690 is the required parens if we have a BIND(C). */
4691 gfc_gobble_whitespace ();
4692 peek_char = gfc_peek_ascii_char ();
4694 if (gfc_add_subroutine (&sym->attr, sym->name, NULL) == FAILURE)
4697 if (gfc_match_formal_arglist (sym, 0, 1) != MATCH_YES)
4700 /* Make sure that it isn't already declared as BIND(C). If it is, it
4701 must have been marked BIND(C) with a BIND(C) attribute and that is
4702 not allowed for procedures. */
4703 if (sym->attr.is_bind_c == 1)
4705 sym->attr.is_bind_c = 0;
4706 if (sym->old_symbol != NULL)
4707 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4708 "variables or common blocks",
4709 &(sym->old_symbol->declared_at));
4711 gfc_error_now ("BIND(C) attribute at %L can only be used for "
4712 "variables or common blocks", &gfc_current_locus);
4715 /* C binding names are not allowed for internal procedures. */
4716 if (gfc_current_state () == COMP_CONTAINS
4717 && sym->ns->proc_name->attr.flavor != FL_MODULE)
4718 allow_binding_name = false;
4720 allow_binding_name = true;
4722 /* Here, we are just checking if it has the bind(c) attribute, and if
4723 so, then we need to make sure it's all correct. If it doesn't,
4724 we still need to continue matching the rest of the subroutine line. */
4725 is_bind_c = gfc_match_bind_c (sym, allow_binding_name);
4726 if (is_bind_c == MATCH_ERROR)
4728 /* There was an attempt at the bind(c), but it was wrong. An
4729 error message should have been printed w/in the gfc_match_bind_c
4730 so here we'll just return the MATCH_ERROR. */
4734 if (is_bind_c == MATCH_YES)
4736 /* The following is allowed in the Fortran 2008 draft. */
4737 if (gfc_current_state () == COMP_CONTAINS
4738 && sym->ns->proc_name->attr.flavor != FL_MODULE
4739 && gfc_notify_std (GFC_STD_F2008, "Fortran 2008: BIND(C) attribute "
4740 "at %L may not be specified for an internal "
4741 "procedure", &gfc_current_locus)
4745 if (peek_char != '(')
4747 gfc_error ("Missing required parentheses before BIND(C) at %C");
4750 if (gfc_add_is_bind_c (&(sym->attr), sym->name, &(sym->declared_at), 1)
4755 if (gfc_match_eos () != MATCH_YES)
4757 gfc_syntax_error (ST_SUBROUTINE);
4761 if (copy_prefix (&sym->attr, &sym->declared_at) == FAILURE)
4768 /* Match a BIND(C) specifier, with the optional 'name=' specifier if
4769 given, and set the binding label in either the given symbol (if not
4770 NULL), or in the current_ts. The symbol may be NULL because we may
4771 encounter the BIND(C) before the declaration itself. Return
4772 MATCH_NO if what we're looking at isn't a BIND(C) specifier,
4773 MATCH_ERROR if it is a BIND(C) clause but an error was encountered,
4774 or MATCH_YES if the specifier was correct and the binding label and
4775 bind(c) fields were set correctly for the given symbol or the
4776 current_ts. If allow_binding_name is false, no binding name may be
4780 gfc_match_bind_c (gfc_symbol *sym, bool allow_binding_name)
4782 /* binding label, if exists */
4783 char binding_label[GFC_MAX_SYMBOL_LEN + 1];
4787 /* Initialize the flag that specifies whether we encountered a NAME=
4788 specifier or not. */
4789 has_name_equals = 0;
4791 /* Init the first char to nil so we can catch if we don't have
4792 the label (name attr) or the symbol name yet. */
4793 binding_label[0] = '\0';
4795 /* This much we have to be able to match, in this order, if
4796 there is a bind(c) label. */
4797 if (gfc_match (" bind ( c ") != MATCH_YES)
4800 /* Now see if there is a binding label, or if we've reached the
4801 end of the bind(c) attribute without one. */
4802 if (gfc_match_char (',') == MATCH_YES)
4804 if (gfc_match (" name = ") != MATCH_YES)
4806 gfc_error ("Syntax error in NAME= specifier for binding label "
4808 /* should give an error message here */
4812 has_name_equals = 1;
4814 /* Get the opening quote. */
4815 double_quote = MATCH_YES;
4816 single_quote = MATCH_YES;
4817 double_quote = gfc_match_char ('"');
4818 if (double_quote != MATCH_YES)
4819 single_quote = gfc_match_char ('\'');
4820 if (double_quote != MATCH_YES && single_quote != MATCH_YES)
4822 gfc_error ("Syntax error in NAME= specifier for binding label "
4827 /* Grab the binding label, using functions that will not lower
4828 case the names automatically. */
4829 if (gfc_match_name_C (binding_label) != MATCH_YES)
4832 /* Get the closing quotation. */
4833 if (double_quote == MATCH_YES)
4835 if (gfc_match_char ('"') != MATCH_YES)
4837 gfc_error ("Missing closing quote '\"' for binding label at %C");
4838 /* User started string with '"' so looked to match it. */
4844 if (gfc_match_char ('\'') != MATCH_YES)
4846 gfc_error ("Missing closing quote '\'' for binding label at %C");
4847 /* User started string with "'" char. */
4853 /* Get the required right paren. */
4854 if (gfc_match_char (')') != MATCH_YES)
4856 gfc_error ("Missing closing paren for binding label at %C");
4860 if (has_name_equals && !allow_binding_name)
4862 gfc_error ("No binding name is allowed in BIND(C) at %C");
4866 if (has_name_equals && sym != NULL && sym->attr.dummy)
4868 gfc_error ("For dummy procedure %s, no binding name is "
4869 "allowed in BIND(C) at %C", sym->name);
4874 /* Save the binding label to the symbol. If sym is null, we're
4875 probably matching the typespec attributes of a declaration and
4876 haven't gotten the name yet, and therefore, no symbol yet. */
4877 if (binding_label[0] != '\0')
4881 strcpy (sym->binding_label, binding_label);
4884 strcpy (curr_binding_label, binding_label);
4886 else if (allow_binding_name)
4888 /* No binding label, but if symbol isn't null, we
4889 can set the label for it here.
4890 If name="" or allow_binding_name is false, no C binding name is
4892 if (sym != NULL && sym->name != NULL && has_name_equals == 0)
4893 strncpy (sym->binding_label, sym->name, strlen (sym->name) + 1);
4896 if (has_name_equals && gfc_current_state () == COMP_INTERFACE
4897 && current_interface.type == INTERFACE_ABSTRACT)
4899 gfc_error ("NAME not allowed on BIND(C) for ABSTRACT INTERFACE at %C");
4907 /* Return nonzero if we're currently compiling a contained procedure. */
4910 contained_procedure (void)
4912 gfc_state_data *s = gfc_state_stack;
4914 if ((s->state == COMP_SUBROUTINE || s->state == COMP_FUNCTION)
4915 && s->previous != NULL && s->previous->state == COMP_CONTAINS)
4921 /* Set the kind of each enumerator. The kind is selected such that it is
4922 interoperable with the corresponding C enumeration type, making
4923 sure that -fshort-enums is honored. */
4928 enumerator_history *current_history = NULL;
4932 if (max_enum == NULL || enum_history == NULL)
4935 if (!gfc_option.fshort_enums)
4941 kind = gfc_integer_kinds[i++].kind;
4943 while (kind < gfc_c_int_kind
4944 && gfc_check_integer_range (max_enum->initializer->value.integer,
4947 current_history = enum_history;
4948 while (current_history != NULL)
4950 current_history->sym->ts.kind = kind;
4951 current_history = current_history->next;
4956 /* Match any of the various end-block statements. Returns the type of
4957 END to the caller. The END INTERFACE, END IF, END DO and END
4958 SELECT statements cannot be replaced by a single END statement. */
4961 gfc_match_end (gfc_statement *st)
4963 char name[GFC_MAX_SYMBOL_LEN + 1];
4964 gfc_compile_state state;
4966 const char *block_name;
4971 old_loc = gfc_current_locus;
4972 if (gfc_match ("end") != MATCH_YES)
4975 state = gfc_current_state ();
4976 block_name = gfc_current_block () == NULL
4977 ? NULL : gfc_current_block ()->name;
4979 if (state == COMP_CONTAINS)
4981 state = gfc_state_stack->previous->state;
4982 block_name = gfc_state_stack->previous->sym == NULL
4983 ? NULL : gfc_state_stack->previous->sym->name;
4990 *st = ST_END_PROGRAM;
4991 target = " program";
4995 case COMP_SUBROUTINE:
4996 *st = ST_END_SUBROUTINE;
4997 target = " subroutine";
4998 eos_ok = !contained_procedure ();
5002 *st = ST_END_FUNCTION;
5003 target = " function";
5004 eos_ok = !contained_procedure ();
5007 case COMP_BLOCK_DATA:
5008 *st = ST_END_BLOCK_DATA;
5009 target = " block data";
5014 *st = ST_END_MODULE;
5019 case COMP_INTERFACE:
5020 *st = ST_END_INTERFACE;
5021 target = " interface";
5044 *st = ST_END_SELECT;
5050 *st = ST_END_FORALL;
5065 last_initializer = NULL;
5067 gfc_free_enum_history ();
5071 gfc_error ("Unexpected END statement at %C");
5075 if (gfc_match_eos () == MATCH_YES)
5079 /* We would have required END [something]. */
5080 gfc_error ("%s statement expected at %L",
5081 gfc_ascii_statement (*st), &old_loc);
5088 /* Verify that we've got the sort of end-block that we're expecting. */
5089 if (gfc_match (target) != MATCH_YES)
5091 gfc_error ("Expecting %s statement at %C", gfc_ascii_statement (*st));
5095 /* If we're at the end, make sure a block name wasn't required. */
5096 if (gfc_match_eos () == MATCH_YES)
5099 if (*st != ST_ENDDO && *st != ST_ENDIF && *st != ST_END_SELECT
5100 && *st != ST_END_FORALL && *st != ST_END_WHERE)
5103 if (gfc_current_block () == NULL)
5106 gfc_error ("Expected block name of '%s' in %s statement at %C",
5107 block_name, gfc_ascii_statement (*st));
5112 /* END INTERFACE has a special handler for its several possible endings. */
5113 if (*st == ST_END_INTERFACE)
5114 return gfc_match_end_interface ();
5116 /* We haven't hit the end of statement, so what is left must be an
5118 m = gfc_match_space ();
5120 m = gfc_match_name (name);
5123 gfc_error ("Expected terminating name at %C");
5127 if (block_name == NULL)
5130 if (strcmp (name, block_name) != 0)
5132 gfc_error ("Expected label '%s' for %s statement at %C", block_name,
5133 gfc_ascii_statement (*st));
5137 if (gfc_match_eos () == MATCH_YES)
5141 gfc_syntax_error (*st);
5144 gfc_current_locus = old_loc;
5150 /***************** Attribute declaration statements ****************/
5152 /* Set the attribute of a single variable. */
5157 char name[GFC_MAX_SYMBOL_LEN + 1];
5165 m = gfc_match_name (name);
5169 if (find_special (name, &sym))
5172 var_locus = gfc_current_locus;
5174 /* Deal with possible array specification for certain attributes. */
5175 if (current_attr.dimension
5176 || current_attr.allocatable
5177 || current_attr.pointer
5178 || current_attr.target)
5180 m = gfc_match_array_spec (&as);
5181 if (m == MATCH_ERROR)
5184 if (current_attr.dimension && m == MATCH_NO)
5186 gfc_error ("Missing array specification at %L in DIMENSION "
5187 "statement", &var_locus);
5192 if (current_attr.dimension && sym->value)
5194 gfc_error ("Dimensions specified for %s at %L after its "
5195 "initialisation", sym->name, &var_locus);
5200 if ((current_attr.allocatable || current_attr.pointer)
5201 && (m == MATCH_YES) && (as->type != AS_DEFERRED))
5203 gfc_error ("Array specification must be deferred at %L", &var_locus);
5209 /* Update symbol table. DIMENSION attribute is set
5210 in gfc_set_array_spec(). */
5211 if (current_attr.dimension == 0
5212 && gfc_copy_attr (&sym->attr, ¤t_attr, NULL) == FAILURE)
5218 if (gfc_set_array_spec (sym, as, &var_locus) == FAILURE)
5224 if (sym->attr.cray_pointee && sym->as != NULL)
5226 /* Fix the array spec. */
5227 m = gfc_mod_pointee_as (sym->as);
5228 if (m == MATCH_ERROR)
5232 if (gfc_add_attribute (&sym->attr, &var_locus) == FAILURE)
5238 if ((current_attr.external || current_attr.intrinsic)
5239 && sym->attr.flavor != FL_PROCEDURE
5240 && gfc_add_flavor (&sym->attr, FL_PROCEDURE, sym->name, NULL) == FAILURE)
5249 gfc_free_array_spec (as);
5254 /* Generic attribute declaration subroutine. Used for attributes that
5255 just have a list of names. */
5262 /* Gobble the optional double colon, by simply ignoring the result
5272 if (gfc_match_eos () == MATCH_YES)
5278 if (gfc_match_char (',') != MATCH_YES)
5280 gfc_error ("Unexpected character in variable list at %C");
5290 /* This routine matches Cray Pointer declarations of the form:
5291 pointer ( <pointer>, <pointee> )
5293 pointer ( <pointer1>, <pointee1> ), ( <pointer2>, <pointee2> ), ...
5294 The pointer, if already declared, should be an integer. Otherwise, we
5295 set it as BT_INTEGER with kind gfc_index_integer_kind. The pointee may
5296 be either a scalar, or an array declaration. No space is allocated for
5297 the pointee. For the statement
5298 pointer (ipt, ar(10))
5299 any subsequent uses of ar will be translated (in C-notation) as
5300 ar(i) => ((<type> *) ipt)(i)
5301 After gimplification, pointee variable will disappear in the code. */
5304 cray_pointer_decl (void)
5308 gfc_symbol *cptr; /* Pointer symbol. */
5309 gfc_symbol *cpte; /* Pointee symbol. */
5315 if (gfc_match_char ('(') != MATCH_YES)
5317 gfc_error ("Expected '(' at %C");
5321 /* Match pointer. */
5322 var_locus = gfc_current_locus;
5323 gfc_clear_attr (¤t_attr);
5324 gfc_add_cray_pointer (¤t_attr, &var_locus);
5325 current_ts.type = BT_INTEGER;
5326 current_ts.kind = gfc_index_integer_kind;
5328 m = gfc_match_symbol (&cptr, 0);
5331 gfc_error ("Expected variable name at %C");
5335 if (gfc_add_cray_pointer (&cptr->attr, &var_locus) == FAILURE)
5338 gfc_set_sym_referenced (cptr);
5340 if (cptr->ts.type == BT_UNKNOWN) /* Override the type, if necessary. */
5342 cptr->ts.type = BT_INTEGER;
5343 cptr->ts.kind = gfc_index_integer_kind;
5345 else if (cptr->ts.type != BT_INTEGER)
5347 gfc_error ("Cray pointer at %C must be an integer");
5350 else if (cptr->ts.kind < gfc_index_integer_kind)
5351 gfc_warning ("Cray pointer at %C has %d bytes of precision;"
5352 " memory addresses require %d bytes",
5353 cptr->ts.kind, gfc_index_integer_kind);
5355 if (gfc_match_char (',') != MATCH_YES)
5357 gfc_error ("Expected \",\" at %C");
5361 /* Match Pointee. */
5362 var_locus = gfc_current_locus;
5363 gfc_clear_attr (¤t_attr);
5364 gfc_add_cray_pointee (¤t_attr, &var_locus);
5365 current_ts.type = BT_UNKNOWN;
5366 current_ts.kind = 0;
5368 m = gfc_match_symbol (&cpte, 0);
5371 gfc_error ("Expected variable name at %C");
5375 /* Check for an optional array spec. */
5376 m = gfc_match_array_spec (&as);
5377 if (m == MATCH_ERROR)
5379 gfc_free_array_spec (as);
5382 else if (m == MATCH_NO)
5384 gfc_free_array_spec (as);
5388 if (gfc_add_cray_pointee (&cpte->attr, &var_locus) == FAILURE)
5391 gfc_set_sym_referenced (cpte);
5393 if (cpte->as == NULL)
5395 if (gfc_set_array_spec (cpte, as, &var_locus) == FAILURE)
5396 gfc_internal_error ("Couldn't set Cray pointee array spec.");
5398 else if (as != NULL)
5400 gfc_error ("Duplicate array spec for Cray pointee at %C");
5401 gfc_free_array_spec (as);
5407 if (cpte->as != NULL)
5409 /* Fix array spec. */
5410 m = gfc_mod_pointee_as (cpte->as);
5411 if (m == MATCH_ERROR)
5415 /* Point the Pointee at the Pointer. */
5416 cpte->cp_pointer = cptr;
5418 if (gfc_match_char (')') != MATCH_YES)
5420 gfc_error ("Expected \")\" at %C");
5423 m = gfc_match_char (',');
5425 done = true; /* Stop searching for more declarations. */
5429 if (m == MATCH_ERROR /* Failed when trying to find ',' above. */
5430 || gfc_match_eos () != MATCH_YES)
5432 gfc_error ("Expected \",\" or end of statement at %C");
5440 gfc_match_external (void)
5443 gfc_clear_attr (¤t_attr);
5444 current_attr.external = 1;
5446 return attr_decl ();
5451 gfc_match_intent (void)
5455 intent = match_intent_spec ();
5456 if (intent == INTENT_UNKNOWN)
5459 gfc_clear_attr (¤t_attr);
5460 current_attr.intent = intent;
5462 return attr_decl ();
5467 gfc_match_intrinsic (void)
5470 gfc_clear_attr (¤t_attr);
5471 current_attr.intrinsic = 1;
5473 return attr_decl ();
5478 gfc_match_optional (void)
5481 gfc_clear_attr (¤t_attr);
5482 current_attr.optional = 1;
5484 return attr_decl ();
5489 gfc_match_pointer (void)
5491 gfc_gobble_whitespace ();
5492 if (gfc_peek_ascii_char () == '(')
5494 if (!gfc_option.flag_cray_pointer)
5496 gfc_error ("Cray pointer declaration at %C requires -fcray-pointer "
5500 return cray_pointer_decl ();
5504 gfc_clear_attr (¤t_attr);
5505 current_attr.pointer = 1;
5507 return attr_decl ();
5513 gfc_match_allocatable (void)
5515 gfc_clear_attr (¤t_attr);
5516 current_attr.allocatable = 1;
5518 return attr_decl ();
5523 gfc_match_dimension (void)
5525 gfc_clear_attr (¤t_attr);
5526 current_attr.dimension = 1;
5528 return attr_decl ();
5533 gfc_match_target (void)
5535 gfc_clear_attr (¤t_attr);
5536 current_attr.target = 1;
5538 return attr_decl ();
5542 /* Match the list of entities being specified in a PUBLIC or PRIVATE
5546 access_attr_decl (gfc_statement st)
5548 char name[GFC_MAX_SYMBOL_LEN + 1];
5549 interface_type type;
5552 gfc_intrinsic_op operator;
5555 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
5560 m = gfc_match_generic_spec (&type, name, &operator);
5563 if (m == MATCH_ERROR)
5568 case INTERFACE_NAMELESS:
5569 case INTERFACE_ABSTRACT:
5572 case INTERFACE_GENERIC:
5573 if (gfc_get_symbol (name, NULL, &sym))
5576 if (gfc_add_access (&sym->attr, (st == ST_PUBLIC)
5577 ? ACCESS_PUBLIC : ACCESS_PRIVATE,
5578 sym->name, NULL) == FAILURE)
5583 case INTERFACE_INTRINSIC_OP:
5584 if (gfc_current_ns->operator_access[operator] == ACCESS_UNKNOWN)
5586 gfc_current_ns->operator_access[operator] =
5587 (st == ST_PUBLIC) ? ACCESS_PUBLIC : ACCESS_PRIVATE;
5591 gfc_error ("Access specification of the %s operator at %C has "
5592 "already been specified", gfc_op2string (operator));
5598 case INTERFACE_USER_OP:
5599 uop = gfc_get_uop (name);
5601 if (uop->access == ACCESS_UNKNOWN)
5603 uop->access = (st == ST_PUBLIC)
5604 ? ACCESS_PUBLIC : ACCESS_PRIVATE;
5608 gfc_error ("Access specification of the .%s. operator at %C "
5609 "has already been specified", sym->name);
5616 if (gfc_match_char (',') == MATCH_NO)
5620 if (gfc_match_eos () != MATCH_YES)
5625 gfc_syntax_error (st);
5633 gfc_match_protected (void)
5638 if (gfc_current_ns->proc_name->attr.flavor != FL_MODULE)
5640 gfc_error ("PROTECTED at %C only allowed in specification "
5641 "part of a module");
5646 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: PROTECTED statement at %C")
5650 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
5655 if (gfc_match_eos () == MATCH_YES)
5660 m = gfc_match_symbol (&sym, 0);
5664 if (gfc_add_protected (&sym->attr, sym->name, &gfc_current_locus)
5677 if (gfc_match_eos () == MATCH_YES)
5679 if (gfc_match_char (',') != MATCH_YES)
5686 gfc_error ("Syntax error in PROTECTED statement at %C");
5691 /* The PRIVATE statement is a bit weird in that it can be an attribute
5692 declaration, but also works as a standlone statement inside of a
5693 type declaration or a module. */
5696 gfc_match_private (gfc_statement *st)
5699 if (gfc_match ("private") != MATCH_YES)
5702 if (gfc_current_state () != COMP_MODULE
5703 && (gfc_current_state () != COMP_DERIVED
5704 || !gfc_state_stack->previous
5705 || gfc_state_stack->previous->state != COMP_MODULE))
5707 gfc_error ("PRIVATE statement at %C is only allowed in the "
5708 "specification part of a module");
5712 if (gfc_current_state () == COMP_DERIVED)
5714 if (gfc_match_eos () == MATCH_YES)
5720 gfc_syntax_error (ST_PRIVATE);
5724 if (gfc_match_eos () == MATCH_YES)
5731 return access_attr_decl (ST_PRIVATE);
5736 gfc_match_public (gfc_statement *st)
5739 if (gfc_match ("public") != MATCH_YES)
5742 if (gfc_current_state () != COMP_MODULE)
5744 gfc_error ("PUBLIC statement at %C is only allowed in the "
5745 "specification part of a module");
5749 if (gfc_match_eos () == MATCH_YES)
5756 return access_attr_decl (ST_PUBLIC);
5760 /* Workhorse for gfc_match_parameter. */
5769 m = gfc_match_symbol (&sym, 0);
5771 gfc_error ("Expected variable name at %C in PARAMETER statement");
5776 if (gfc_match_char ('=') == MATCH_NO)
5778 gfc_error ("Expected = sign in PARAMETER statement at %C");
5782 m = gfc_match_init_expr (&init);
5784 gfc_error ("Expected expression at %C in PARAMETER statement");
5788 if (sym->ts.type == BT_UNKNOWN
5789 && gfc_set_default_type (sym, 1, NULL) == FAILURE)
5795 if (gfc_check_assign_symbol (sym, init) == FAILURE
5796 || gfc_add_flavor (&sym->attr, FL_PARAMETER, sym->name, NULL) == FAILURE)
5804 gfc_error ("Initializing already initialized variable at %C");
5809 if (sym->ts.type == BT_CHARACTER
5810 && sym->ts.cl != NULL
5811 && sym->ts.cl->length != NULL
5812 && sym->ts.cl->length->expr_type == EXPR_CONSTANT
5813 && init->expr_type == EXPR_CONSTANT
5814 && init->ts.type == BT_CHARACTER
5815 && init->ts.kind == 1)
5816 gfc_set_constant_character_len (
5817 mpz_get_si (sym->ts.cl->length->value.integer), init, false);
5823 gfc_free_expr (init);
5828 /* Match a parameter statement, with the weird syntax that these have. */
5831 gfc_match_parameter (void)
5835 if (gfc_match_char ('(') == MATCH_NO)
5844 if (gfc_match (" )%t") == MATCH_YES)
5847 if (gfc_match_char (',') != MATCH_YES)
5849 gfc_error ("Unexpected characters in PARAMETER statement at %C");
5859 /* Save statements have a special syntax. */
5862 gfc_match_save (void)
5864 char n[GFC_MAX_SYMBOL_LEN+1];
5869 if (gfc_match_eos () == MATCH_YES)
5871 if (gfc_current_ns->seen_save)
5873 if (gfc_notify_std (GFC_STD_LEGACY, "Blanket SAVE statement at %C "
5874 "follows previous SAVE statement")
5879 gfc_current_ns->save_all = gfc_current_ns->seen_save = 1;
5883 if (gfc_current_ns->save_all)
5885 if (gfc_notify_std (GFC_STD_LEGACY, "SAVE statement at %C follows "
5886 "blanket SAVE statement")
5895 m = gfc_match_symbol (&sym, 0);
5899 if (gfc_add_save (&sym->attr, sym->name, &gfc_current_locus)
5911 m = gfc_match (" / %n /", &n);
5912 if (m == MATCH_ERROR)
5917 c = gfc_get_common (n, 0);
5920 gfc_current_ns->seen_save = 1;
5923 if (gfc_match_eos () == MATCH_YES)
5925 if (gfc_match_char (',') != MATCH_YES)
5932 gfc_error ("Syntax error in SAVE statement at %C");
5938 gfc_match_value (void)
5943 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: VALUE statement at %C")
5947 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
5952 if (gfc_match_eos () == MATCH_YES)
5957 m = gfc_match_symbol (&sym, 0);
5961 if (gfc_add_value (&sym->attr, sym->name, &gfc_current_locus)
5974 if (gfc_match_eos () == MATCH_YES)
5976 if (gfc_match_char (',') != MATCH_YES)
5983 gfc_error ("Syntax error in VALUE statement at %C");
5989 gfc_match_volatile (void)
5994 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: VOLATILE statement at %C")
5998 if (gfc_match (" ::") == MATCH_NO && gfc_match_space () == MATCH_NO)
6003 if (gfc_match_eos () == MATCH_YES)
6008 /* VOLATILE is special because it can be added to host-associated
6010 m = gfc_match_symbol (&sym, 1);
6014 if (gfc_add_volatile (&sym->attr, sym->name, &gfc_current_locus)
6027 if (gfc_match_eos () == MATCH_YES)
6029 if (gfc_match_char (',') != MATCH_YES)
6036 gfc_error ("Syntax error in VOLATILE statement at %C");
6041 /* Match a module procedure statement. Note that we have to modify
6042 symbols in the parent's namespace because the current one was there
6043 to receive symbols that are in an interface's formal argument list. */
6046 gfc_match_modproc (void)
6048 char name[GFC_MAX_SYMBOL_LEN + 1];
6051 gfc_namespace *module_ns;
6052 gfc_interface *old_interface_head, *interface;
6054 if (gfc_state_stack->state != COMP_INTERFACE
6055 || gfc_state_stack->previous == NULL
6056 || current_interface.type == INTERFACE_NAMELESS
6057 || current_interface.type == INTERFACE_ABSTRACT)
6059 gfc_error ("MODULE PROCEDURE at %C must be in a generic module "
6064 module_ns = gfc_current_ns->parent;
6065 for (; module_ns; module_ns = module_ns->parent)
6066 if (module_ns->proc_name->attr.flavor == FL_MODULE)
6069 if (module_ns == NULL)
6072 /* Store the current state of the interface. We will need it if we
6073 end up with a syntax error and need to recover. */
6074 old_interface_head = gfc_current_interface_head ();
6080 m = gfc_match_name (name);
6086 /* Check for syntax error before starting to add symbols to the
6087 current namespace. */
6088 if (gfc_match_eos () == MATCH_YES)
6090 if (!last && gfc_match_char (',') != MATCH_YES)
6093 /* Now we're sure the syntax is valid, we process this item
6095 if (gfc_get_symbol (name, module_ns, &sym))
6098 if (sym->attr.proc != PROC_MODULE
6099 && gfc_add_procedure (&sym->attr, PROC_MODULE,
6100 sym->name, NULL) == FAILURE)
6103 if (gfc_add_interface (sym) == FAILURE)
6106 sym->attr.mod_proc = 1;
6115 /* Restore the previous state of the interface. */
6116 interface = gfc_current_interface_head ();
6117 gfc_set_current_interface_head (old_interface_head);
6119 /* Free the new interfaces. */
6120 while (interface != old_interface_head)
6122 gfc_interface *i = interface->next;
6123 gfc_free (interface);
6127 /* And issue a syntax error. */
6128 gfc_syntax_error (ST_MODULE_PROC);
6133 /* Match the optional attribute specifiers for a type declaration.
6134 Return MATCH_ERROR if an error is encountered in one of the handled
6135 attributes (public, private, bind(c)), MATCH_NO if what's found is
6136 not a handled attribute, and MATCH_YES otherwise. TODO: More error
6137 checking on attribute conflicts needs to be done. */
6140 gfc_get_type_attr_spec (symbol_attribute *attr)
6142 /* See if the derived type is marked as private. */
6143 if (gfc_match (" , private") == MATCH_YES)
6145 if (gfc_current_state () != COMP_MODULE)
6147 gfc_error ("Derived type at %C can only be PRIVATE in the "
6148 "specification part of a module");
6152 if (gfc_add_access (attr, ACCESS_PRIVATE, NULL, NULL) == FAILURE)
6155 else if (gfc_match (" , public") == MATCH_YES)
6157 if (gfc_current_state () != COMP_MODULE)
6159 gfc_error ("Derived type at %C can only be PUBLIC in the "
6160 "specification part of a module");
6164 if (gfc_add_access (attr, ACCESS_PUBLIC, NULL, NULL) == FAILURE)
6167 else if (gfc_match(" , bind ( c )") == MATCH_YES)
6169 /* If the type is defined to be bind(c) it then needs to make
6170 sure that all fields are interoperable. This will
6171 need to be a semantic check on the finished derived type.
6172 See 15.2.3 (lines 9-12) of F2003 draft. */
6173 if (gfc_add_is_bind_c (attr, NULL, &gfc_current_locus, 0) != SUCCESS)
6176 /* TODO: attr conflicts need to be checked, probably in symbol.c. */
6181 /* If we get here, something matched. */
6186 /* Match the beginning of a derived type declaration. If a type name
6187 was the result of a function, then it is possible to have a symbol
6188 already to be known as a derived type yet have no components. */
6191 gfc_match_derived_decl (void)
6193 char name[GFC_MAX_SYMBOL_LEN + 1];
6194 symbol_attribute attr;
6197 match is_type_attr_spec = MATCH_NO;
6198 bool seen_attr = false;
6200 if (gfc_current_state () == COMP_DERIVED)
6203 gfc_clear_attr (&attr);
6207 is_type_attr_spec = gfc_get_type_attr_spec (&attr);
6208 if (is_type_attr_spec == MATCH_ERROR)
6210 if (is_type_attr_spec == MATCH_YES)
6212 } while (is_type_attr_spec == MATCH_YES);
6214 if (gfc_match (" ::") != MATCH_YES && seen_attr)
6216 gfc_error ("Expected :: in TYPE definition at %C");
6220 m = gfc_match (" %n%t", name);
6224 /* Make sure the name is not the name of an intrinsic type. */
6225 if (gfc_is_intrinsic_typename (name))
6227 gfc_error ("Type name '%s' at %C cannot be the same as an intrinsic "
6232 if (gfc_get_symbol (name, NULL, &sym))
6235 if (sym->ts.type != BT_UNKNOWN)
6237 gfc_error ("Derived type name '%s' at %C already has a basic type "
6238 "of %s", sym->name, gfc_typename (&sym->ts));
6242 /* The symbol may already have the derived attribute without the
6243 components. The ways this can happen is via a function
6244 definition, an INTRINSIC statement or a subtype in another
6245 derived type that is a pointer. The first part of the AND clause
6246 is true if a the symbol is not the return value of a function. */
6247 if (sym->attr.flavor != FL_DERIVED
6248 && gfc_add_flavor (&sym->attr, FL_DERIVED, sym->name, NULL) == FAILURE)
6251 if (sym->components != NULL || sym->attr.zero_comp)
6253 gfc_error ("Derived type definition of '%s' at %C has already been "
6254 "defined", sym->name);
6258 if (attr.access != ACCESS_UNKNOWN
6259 && gfc_add_access (&sym->attr, attr.access, sym->name, NULL) == FAILURE)
6262 /* See if the derived type was labeled as bind(c). */
6263 if (attr.is_bind_c != 0)
6264 sym->attr.is_bind_c = attr.is_bind_c;
6266 gfc_new_block = sym;
6272 /* Cray Pointees can be declared as:
6273 pointer (ipt, a (n,m,...,*))
6274 By default, this is treated as an AS_ASSUMED_SIZE array. We'll
6275 cheat and set a constant bound of 1 for the last dimension, if this
6276 is the case. Since there is no bounds-checking for Cray Pointees,
6277 this will be okay. */
6280 gfc_mod_pointee_as (gfc_array_spec *as)
6282 as->cray_pointee = true; /* This will be useful to know later. */
6283 if (as->type == AS_ASSUMED_SIZE)
6285 as->type = AS_EXPLICIT;
6286 as->upper[as->rank - 1] = gfc_int_expr (1);
6287 as->cp_was_assumed = true;
6289 else if (as->type == AS_ASSUMED_SHAPE)
6291 gfc_error ("Cray Pointee at %C cannot be assumed shape array");
6298 /* Match the enum definition statement, here we are trying to match
6299 the first line of enum definition statement.
6300 Returns MATCH_YES if match is found. */
6303 gfc_match_enum (void)
6307 m = gfc_match_eos ();
6311 if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: ENUM and ENUMERATOR at %C")
6319 /* Match a variable name with an optional initializer. When this
6320 subroutine is called, a variable is expected to be parsed next.
6321 Depending on what is happening at the moment, updates either the
6322 symbol table or the current interface. */
6325 enumerator_decl (void)
6327 char name[GFC_MAX_SYMBOL_LEN + 1];
6328 gfc_expr *initializer;
6329 gfc_array_spec *as = NULL;
6337 old_locus = gfc_current_locus;
6339 /* When we get here, we've just matched a list of attributes and
6340 maybe a type and a double colon. The next thing we expect to see
6341 is the name of the symbol. */
6342 m = gfc_match_name (name);
6346 var_locus = gfc_current_locus;
6348 /* OK, we've successfully matched the declaration. Now put the
6349 symbol in the current namespace. If we fail to create the symbol,
6351 if (build_sym (name, NULL, &as, &var_locus) == FAILURE)
6357 /* The double colon must be present in order to have initializers.
6358 Otherwise the statement is ambiguous with an assignment statement. */
6361 if (gfc_match_char ('=') == MATCH_YES)
6363 m = gfc_match_init_expr (&initializer);
6366 gfc_error ("Expected an initialization expression at %C");
6375 /* If we do not have an initializer, the initialization value of the
6376 previous enumerator (stored in last_initializer) is incremented
6377 by 1 and is used to initialize the current enumerator. */
6378 if (initializer == NULL)
6379 initializer = gfc_enum_initializer (last_initializer, old_locus);
6381 if (initializer == NULL || initializer->ts.type != BT_INTEGER)
6383 gfc_error("ENUMERATOR %L not initialized with integer expression",
6386 gfc_free_enum_history ();
6390 /* Store this current initializer, for the next enumerator variable
6391 to be parsed. add_init_expr_to_sym() zeros initializer, so we
6392 use last_initializer below. */
6393 last_initializer = initializer;
6394 t = add_init_expr_to_sym (name, &initializer, &var_locus);
6396 /* Maintain enumerator history. */
6397 gfc_find_symbol (name, NULL, 0, &sym);
6398 create_enum_history (sym, last_initializer);
6400 return (t == SUCCESS) ? MATCH_YES : MATCH_ERROR;
6403 /* Free stuff up and return. */
6404 gfc_free_expr (initializer);
6410 /* Match the enumerator definition statement. */
6413 gfc_match_enumerator_def (void)
6418 gfc_clear_ts (¤t_ts);
6420 m = gfc_match (" enumerator");
6424 m = gfc_match (" :: ");
6425 if (m == MATCH_ERROR)
6428 colon_seen = (m == MATCH_YES);
6430 if (gfc_current_state () != COMP_ENUM)
6432 gfc_error ("ENUM definition statement expected before %C");
6433 gfc_free_enum_history ();
6437 (¤t_ts)->type = BT_INTEGER;
6438 (¤t_ts)->kind = gfc_c_int_kind;
6440 gfc_clear_attr (¤t_attr);
6441 t = gfc_add_flavor (¤t_attr, FL_PARAMETER, NULL, NULL);
6450 m = enumerator_decl ();
6451 if (m == MATCH_ERROR)
6456 if (gfc_match_eos () == MATCH_YES)
6458 if (gfc_match_char (',') != MATCH_YES)
6462 if (gfc_current_state () == COMP_ENUM)
6464 gfc_free_enum_history ();
6465 gfc_error ("Syntax error in ENUMERATOR definition at %C");
6470 gfc_free_array_spec (current_as);