1 /* Deal with interfaces.
2 Copyright (C) 2000-2013 Free Software Foundation, Inc.
3 Contributed by Andy Vaught
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
22 /* Deal with interfaces. An explicit interface is represented as a
23 singly linked list of formal argument structures attached to the
24 relevant symbols. For an implicit interface, the arguments don't
25 point to symbols. Explicit interfaces point to namespaces that
26 contain the symbols within that interface.
28 Implicit interfaces are linked together in a singly linked list
29 along the next_if member of symbol nodes. Since a particular
30 symbol can only have a single explicit interface, the symbol cannot
31 be part of multiple lists and a single next-member suffices.
33 This is not the case for general classes, though. An operator
34 definition is independent of just about all other uses and has it's
38 Nameless interfaces create symbols with explicit interfaces within
39 the current namespace. They are otherwise unlinked.
42 The generic name points to a linked list of symbols. Each symbol
43 has an explicit interface. Each explicit interface has its own
44 namespace containing the arguments. Module procedures are symbols in
45 which the interface is added later when the module procedure is parsed.
48 User-defined operators are stored in a their own set of symtrees
49 separate from regular symbols. The symtrees point to gfc_user_op
50 structures which in turn head up a list of relevant interfaces.
52 Extended intrinsics and assignment:
53 The head of these interface lists are stored in the containing namespace.
56 An implicit interface is represented as a singly linked list of
57 formal argument list structures that don't point to any symbol
58 nodes -- they just contain types.
61 When a subprogram is defined, the program unit's name points to an
62 interface as usual, but the link to the namespace is NULL and the
63 formal argument list points to symbols within the same namespace as
64 the program unit name. */
68 #include "coretypes.h"
73 /* The current_interface structure holds information about the
74 interface currently being parsed. This structure is saved and
75 restored during recursive interfaces. */
77 gfc_interface_info current_interface;
80 /* Free a singly linked list of gfc_interface structures. */
83 gfc_free_interface (gfc_interface *intr)
87 for (; intr; intr = next)
95 /* Change the operators unary plus and minus into binary plus and
96 minus respectively, leaving the rest unchanged. */
98 static gfc_intrinsic_op
99 fold_unary_intrinsic (gfc_intrinsic_op op)
103 case INTRINSIC_UPLUS:
106 case INTRINSIC_UMINUS:
107 op = INTRINSIC_MINUS;
117 /* Match a generic specification. Depending on which type of
118 interface is found, the 'name' or 'op' pointers may be set.
119 This subroutine doesn't return MATCH_NO. */
122 gfc_match_generic_spec (interface_type *type,
124 gfc_intrinsic_op *op)
126 char buffer[GFC_MAX_SYMBOL_LEN + 1];
130 if (gfc_match (" assignment ( = )") == MATCH_YES)
132 *type = INTERFACE_INTRINSIC_OP;
133 *op = INTRINSIC_ASSIGN;
137 if (gfc_match (" operator ( %o )", &i) == MATCH_YES)
139 *type = INTERFACE_INTRINSIC_OP;
140 *op = fold_unary_intrinsic (i);
144 *op = INTRINSIC_NONE;
145 if (gfc_match (" operator ( ") == MATCH_YES)
147 m = gfc_match_defined_op_name (buffer, 1);
153 m = gfc_match_char (')');
159 strcpy (name, buffer);
160 *type = INTERFACE_USER_OP;
164 if (gfc_match_name (buffer) == MATCH_YES)
166 strcpy (name, buffer);
167 *type = INTERFACE_GENERIC;
171 *type = INTERFACE_NAMELESS;
175 gfc_error ("Syntax error in generic specification at %C");
180 /* Match one of the five F95 forms of an interface statement. The
181 matcher for the abstract interface follows. */
184 gfc_match_interface (void)
186 char name[GFC_MAX_SYMBOL_LEN + 1];
192 m = gfc_match_space ();
194 if (gfc_match_generic_spec (&type, name, &op) == MATCH_ERROR)
197 /* If we're not looking at the end of the statement now, or if this
198 is not a nameless interface but we did not see a space, punt. */
199 if (gfc_match_eos () != MATCH_YES
200 || (type != INTERFACE_NAMELESS && m != MATCH_YES))
202 gfc_error ("Syntax error: Trailing garbage in INTERFACE statement "
207 current_interface.type = type;
211 case INTERFACE_GENERIC:
212 if (gfc_get_symbol (name, NULL, &sym))
215 if (!sym->attr.generic
216 && !gfc_add_generic (&sym->attr, sym->name, NULL))
221 gfc_error ("Dummy procedure '%s' at %C cannot have a "
222 "generic interface", sym->name);
226 current_interface.sym = gfc_new_block = sym;
229 case INTERFACE_USER_OP:
230 current_interface.uop = gfc_get_uop (name);
233 case INTERFACE_INTRINSIC_OP:
234 current_interface.op = op;
237 case INTERFACE_NAMELESS:
238 case INTERFACE_ABSTRACT:
247 /* Match a F2003 abstract interface. */
250 gfc_match_abstract_interface (void)
254 if (!gfc_notify_std (GFC_STD_F2003, "ABSTRACT INTERFACE at %C"))
257 m = gfc_match_eos ();
261 gfc_error ("Syntax error in ABSTRACT INTERFACE statement at %C");
265 current_interface.type = INTERFACE_ABSTRACT;
271 /* Match the different sort of generic-specs that can be present after
272 the END INTERFACE itself. */
275 gfc_match_end_interface (void)
277 char name[GFC_MAX_SYMBOL_LEN + 1];
282 m = gfc_match_space ();
284 if (gfc_match_generic_spec (&type, name, &op) == MATCH_ERROR)
287 /* If we're not looking at the end of the statement now, or if this
288 is not a nameless interface but we did not see a space, punt. */
289 if (gfc_match_eos () != MATCH_YES
290 || (type != INTERFACE_NAMELESS && m != MATCH_YES))
292 gfc_error ("Syntax error: Trailing garbage in END INTERFACE "
299 switch (current_interface.type)
301 case INTERFACE_NAMELESS:
302 case INTERFACE_ABSTRACT:
303 if (type != INTERFACE_NAMELESS)
305 gfc_error ("Expected a nameless interface at %C");
311 case INTERFACE_INTRINSIC_OP:
312 if (type != current_interface.type || op != current_interface.op)
315 if (current_interface.op == INTRINSIC_ASSIGN)
318 gfc_error ("Expected 'END INTERFACE ASSIGNMENT (=)' at %C");
323 s1 = gfc_op2string (current_interface.op);
324 s2 = gfc_op2string (op);
326 /* The following if-statements are used to enforce C1202
328 if ((strcmp(s1, "==") == 0 && strcmp (s2, ".eq.") == 0)
329 || (strcmp(s1, ".eq.") == 0 && strcmp (s2, "==") == 0))
331 if ((strcmp(s1, "/=") == 0 && strcmp (s2, ".ne.") == 0)
332 || (strcmp(s1, ".ne.") == 0 && strcmp (s2, "/=") == 0))
334 if ((strcmp(s1, "<=") == 0 && strcmp (s2, ".le.") == 0)
335 || (strcmp(s1, ".le.") == 0 && strcmp (s2, "<=") == 0))
337 if ((strcmp(s1, "<") == 0 && strcmp (s2, ".lt.") == 0)
338 || (strcmp(s1, ".lt.") == 0 && strcmp (s2, "<") == 0))
340 if ((strcmp(s1, ">=") == 0 && strcmp (s2, ".ge.") == 0)
341 || (strcmp(s1, ".ge.") == 0 && strcmp (s2, ">=") == 0))
343 if ((strcmp(s1, ">") == 0 && strcmp (s2, ".gt.") == 0)
344 || (strcmp(s1, ".gt.") == 0 && strcmp (s2, ">") == 0))
348 gfc_error ("Expecting 'END INTERFACE OPERATOR (%s)' at %C, "
349 "but got %s", s1, s2);
356 case INTERFACE_USER_OP:
357 /* Comparing the symbol node names is OK because only use-associated
358 symbols can be renamed. */
359 if (type != current_interface.type
360 || strcmp (current_interface.uop->name, name) != 0)
362 gfc_error ("Expecting 'END INTERFACE OPERATOR (.%s.)' at %C",
363 current_interface.uop->name);
369 case INTERFACE_GENERIC:
370 if (type != current_interface.type
371 || strcmp (current_interface.sym->name, name) != 0)
373 gfc_error ("Expecting 'END INTERFACE %s' at %C",
374 current_interface.sym->name);
385 /* Compare two derived types using the criteria in 4.4.2 of the standard,
386 recursing through gfc_compare_types for the components. */
389 gfc_compare_derived_types (gfc_symbol *derived1, gfc_symbol *derived2)
391 gfc_component *dt1, *dt2;
393 if (derived1 == derived2)
396 gcc_assert (derived1 && derived2);
398 /* Special case for comparing derived types across namespaces. If the
399 true names and module names are the same and the module name is
400 nonnull, then they are equal. */
401 if (strcmp (derived1->name, derived2->name) == 0
402 && derived1->module != NULL && derived2->module != NULL
403 && strcmp (derived1->module, derived2->module) == 0)
406 /* Compare type via the rules of the standard. Both types must have
407 the SEQUENCE or BIND(C) attribute to be equal. */
409 if (strcmp (derived1->name, derived2->name))
412 if (derived1->component_access == ACCESS_PRIVATE
413 || derived2->component_access == ACCESS_PRIVATE)
416 if (!(derived1->attr.sequence && derived2->attr.sequence)
417 && !(derived1->attr.is_bind_c && derived2->attr.is_bind_c))
420 dt1 = derived1->components;
421 dt2 = derived2->components;
423 /* Since subtypes of SEQUENCE types must be SEQUENCE types as well, a
424 simple test can speed things up. Otherwise, lots of things have to
428 if (strcmp (dt1->name, dt2->name) != 0)
431 if (dt1->attr.access != dt2->attr.access)
434 if (dt1->attr.pointer != dt2->attr.pointer)
437 if (dt1->attr.dimension != dt2->attr.dimension)
440 if (dt1->attr.allocatable != dt2->attr.allocatable)
443 if (dt1->attr.dimension && gfc_compare_array_spec (dt1->as, dt2->as) == 0)
446 /* Make sure that link lists do not put this function into an
447 endless recursive loop! */
448 if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
449 && !(dt2->ts.type == BT_DERIVED && derived2 == dt2->ts.u.derived)
450 && gfc_compare_types (&dt1->ts, &dt2->ts) == 0)
453 else if ((dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
454 && !(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived))
457 else if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
458 && (dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived))
464 if (dt1 == NULL && dt2 == NULL)
466 if (dt1 == NULL || dt2 == NULL)
474 /* Compare two typespecs, recursively if necessary. */
477 gfc_compare_types (gfc_typespec *ts1, gfc_typespec *ts2)
479 /* See if one of the typespecs is a BT_VOID, which is what is being used
480 to allow the funcs like c_f_pointer to accept any pointer type.
481 TODO: Possibly should narrow this to just the one typespec coming in
482 that is for the formal arg, but oh well. */
483 if (ts1->type == BT_VOID || ts2->type == BT_VOID)
486 if (ts1->type == BT_CLASS
487 && ts1->u.derived->components->ts.u.derived->attr.unlimited_polymorphic)
491 if (ts2->type == BT_CLASS && ts1->type == BT_DERIVED
492 && ts2->u.derived->components->ts.u.derived->attr.unlimited_polymorphic
493 && (ts1->u.derived->attr.sequence || ts1->u.derived->attr.is_bind_c))
496 if (ts1->type != ts2->type
497 && ((ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
498 || (ts2->type != BT_DERIVED && ts2->type != BT_CLASS)))
500 if (ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
501 return (ts1->kind == ts2->kind);
503 /* Compare derived types. */
504 if (gfc_type_compatible (ts1, ts2))
507 return gfc_compare_derived_types (ts1->u.derived ,ts2->u.derived);
512 compare_type (gfc_symbol *s1, gfc_symbol *s2)
514 if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
517 /* TYPE and CLASS of the same declared type are type compatible,
518 but have different characteristics. */
519 if ((s1->ts.type == BT_CLASS && s2->ts.type == BT_DERIVED)
520 || (s1->ts.type == BT_DERIVED && s2->ts.type == BT_CLASS))
523 return gfc_compare_types (&s1->ts, &s2->ts) || s2->ts.type == BT_ASSUMED;
528 compare_rank (gfc_symbol *s1, gfc_symbol *s2)
530 gfc_array_spec *as1, *as2;
533 if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
536 as1 = (s1->ts.type == BT_CLASS) ? CLASS_DATA (s1)->as : s1->as;
537 as2 = (s2->ts.type == BT_CLASS) ? CLASS_DATA (s2)->as : s2->as;
539 r1 = as1 ? as1->rank : 0;
540 r2 = as2 ? as2->rank : 0;
542 if (r1 != r2 && (!as2 || as2->type != AS_ASSUMED_RANK))
543 return 0; /* Ranks differ. */
549 /* Given two symbols that are formal arguments, compare their ranks
550 and types. Returns nonzero if they have the same rank and type,
554 compare_type_rank (gfc_symbol *s1, gfc_symbol *s2)
556 return compare_type (s1, s2) && compare_rank (s1, s2);
560 /* Given two symbols that are formal arguments, compare their types
561 and rank and their formal interfaces if they are both dummy
562 procedures. Returns nonzero if the same, zero if different. */
565 compare_type_rank_if (gfc_symbol *s1, gfc_symbol *s2)
567 if (s1 == NULL || s2 == NULL)
568 return s1 == s2 ? 1 : 0;
573 if (s1->attr.flavor != FL_PROCEDURE && s2->attr.flavor != FL_PROCEDURE)
574 return compare_type_rank (s1, s2);
576 if (s1->attr.flavor != FL_PROCEDURE || s2->attr.flavor != FL_PROCEDURE)
579 /* At this point, both symbols are procedures. It can happen that
580 external procedures are compared, where one is identified by usage
581 to be a function or subroutine but the other is not. Check TKR
582 nonetheless for these cases. */
583 if (s1->attr.function == 0 && s1->attr.subroutine == 0)
584 return s1->attr.external == 1 ? compare_type_rank (s1, s2) : 0;
586 if (s2->attr.function == 0 && s2->attr.subroutine == 0)
587 return s2->attr.external == 1 ? compare_type_rank (s1, s2) : 0;
589 /* Now the type of procedure has been identified. */
590 if (s1->attr.function != s2->attr.function
591 || s1->attr.subroutine != s2->attr.subroutine)
594 if (s1->attr.function && compare_type_rank (s1, s2) == 0)
597 /* Originally, gfortran recursed here to check the interfaces of passed
598 procedures. This is explicitly not required by the standard. */
603 /* Given a formal argument list and a keyword name, search the list
604 for that keyword. Returns the correct symbol node if found, NULL
608 find_keyword_arg (const char *name, gfc_formal_arglist *f)
610 for (; f; f = f->next)
611 if (strcmp (f->sym->name, name) == 0)
618 /******** Interface checking subroutines **********/
621 /* Given an operator interface and the operator, make sure that all
622 interfaces for that operator are legal. */
625 gfc_check_operator_interface (gfc_symbol *sym, gfc_intrinsic_op op,
628 gfc_formal_arglist *formal;
631 int args, r1, r2, k1, k2;
636 t1 = t2 = BT_UNKNOWN;
637 i1 = i2 = INTENT_UNKNOWN;
641 for (formal = gfc_sym_get_dummy_args (sym); formal; formal = formal->next)
643 gfc_symbol *fsym = formal->sym;
646 gfc_error ("Alternate return cannot appear in operator "
647 "interface at %L", &sym->declared_at);
653 i1 = fsym->attr.intent;
654 r1 = (fsym->as != NULL) ? fsym->as->rank : 0;
660 i2 = fsym->attr.intent;
661 r2 = (fsym->as != NULL) ? fsym->as->rank : 0;
667 /* Only +, - and .not. can be unary operators.
668 .not. cannot be a binary operator. */
669 if (args == 0 || args > 2 || (args == 1 && op != INTRINSIC_PLUS
670 && op != INTRINSIC_MINUS
671 && op != INTRINSIC_NOT)
672 || (args == 2 && op == INTRINSIC_NOT))
674 if (op == INTRINSIC_ASSIGN)
675 gfc_error ("Assignment operator interface at %L must have "
676 "two arguments", &sym->declared_at);
678 gfc_error ("Operator interface at %L has the wrong number of arguments",
683 /* Check that intrinsics are mapped to functions, except
684 INTRINSIC_ASSIGN which should map to a subroutine. */
685 if (op == INTRINSIC_ASSIGN)
687 gfc_formal_arglist *dummy_args;
689 if (!sym->attr.subroutine)
691 gfc_error ("Assignment operator interface at %L must be "
692 "a SUBROUTINE", &sym->declared_at);
696 /* Allowed are (per F2003, 12.3.2.1.2 Defined assignments):
697 - First argument an array with different rank than second,
698 - First argument is a scalar and second an array,
699 - Types and kinds do not conform, or
700 - First argument is of derived type. */
701 dummy_args = gfc_sym_get_dummy_args (sym);
702 if (dummy_args->sym->ts.type != BT_DERIVED
703 && dummy_args->sym->ts.type != BT_CLASS
704 && (r2 == 0 || r1 == r2)
705 && (dummy_args->sym->ts.type == dummy_args->next->sym->ts.type
706 || (gfc_numeric_ts (&dummy_args->sym->ts)
707 && gfc_numeric_ts (&dummy_args->next->sym->ts))))
709 gfc_error ("Assignment operator interface at %L must not redefine "
710 "an INTRINSIC type assignment", &sym->declared_at);
716 if (!sym->attr.function)
718 gfc_error ("Intrinsic operator interface at %L must be a FUNCTION",
724 /* Check intents on operator interfaces. */
725 if (op == INTRINSIC_ASSIGN)
727 if (i1 != INTENT_OUT && i1 != INTENT_INOUT)
729 gfc_error ("First argument of defined assignment at %L must be "
730 "INTENT(OUT) or INTENT(INOUT)", &sym->declared_at);
736 gfc_error ("Second argument of defined assignment at %L must be "
737 "INTENT(IN)", &sym->declared_at);
745 gfc_error ("First argument of operator interface at %L must be "
746 "INTENT(IN)", &sym->declared_at);
750 if (args == 2 && i2 != INTENT_IN)
752 gfc_error ("Second argument of operator interface at %L must be "
753 "INTENT(IN)", &sym->declared_at);
758 /* From now on, all we have to do is check that the operator definition
759 doesn't conflict with an intrinsic operator. The rules for this
760 game are defined in 7.1.2 and 7.1.3 of both F95 and F2003 standards,
761 as well as 12.3.2.1.1 of Fortran 2003:
763 "If the operator is an intrinsic-operator (R310), the number of
764 function arguments shall be consistent with the intrinsic uses of
765 that operator, and the types, kind type parameters, or ranks of the
766 dummy arguments shall differ from those required for the intrinsic
767 operation (7.1.2)." */
769 #define IS_NUMERIC_TYPE(t) \
770 ((t) == BT_INTEGER || (t) == BT_REAL || (t) == BT_COMPLEX)
772 /* Unary ops are easy, do them first. */
773 if (op == INTRINSIC_NOT)
775 if (t1 == BT_LOGICAL)
781 if (args == 1 && (op == INTRINSIC_PLUS || op == INTRINSIC_MINUS))
783 if (IS_NUMERIC_TYPE (t1))
789 /* Character intrinsic operators have same character kind, thus
790 operator definitions with operands of different character kinds
792 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER && k1 != k2)
795 /* Intrinsic operators always perform on arguments of same rank,
796 so different ranks is also always safe. (rank == 0) is an exception
797 to that, because all intrinsic operators are elemental. */
798 if (r1 != r2 && r1 != 0 && r2 != 0)
804 case INTRINSIC_EQ_OS:
806 case INTRINSIC_NE_OS:
807 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
812 case INTRINSIC_MINUS:
813 case INTRINSIC_TIMES:
814 case INTRINSIC_DIVIDE:
815 case INTRINSIC_POWER:
816 if (IS_NUMERIC_TYPE (t1) && IS_NUMERIC_TYPE (t2))
821 case INTRINSIC_GT_OS:
823 case INTRINSIC_GE_OS:
825 case INTRINSIC_LT_OS:
827 case INTRINSIC_LE_OS:
828 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
830 if ((t1 == BT_INTEGER || t1 == BT_REAL)
831 && (t2 == BT_INTEGER || t2 == BT_REAL))
835 case INTRINSIC_CONCAT:
836 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
844 if (t1 == BT_LOGICAL && t2 == BT_LOGICAL)
854 #undef IS_NUMERIC_TYPE
857 gfc_error ("Operator interface at %L conflicts with intrinsic interface",
863 /* Given a pair of formal argument lists, we see if the two lists can
864 be distinguished by counting the number of nonoptional arguments of
865 a given type/rank in f1 and seeing if there are less then that
866 number of those arguments in f2 (including optional arguments).
867 Since this test is asymmetric, it has to be called twice to make it
868 symmetric. Returns nonzero if the argument lists are incompatible
869 by this test. This subroutine implements rule 1 of section F03:16.2.3.
870 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */
873 count_types_test (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
874 const char *p1, const char *p2)
876 int rc, ac1, ac2, i, j, k, n1;
877 gfc_formal_arglist *f;
890 for (f = f1; f; f = f->next)
893 /* Build an array of integers that gives the same integer to
894 arguments of the same type/rank. */
895 arg = XCNEWVEC (arginfo, n1);
898 for (i = 0; i < n1; i++, f = f->next)
906 for (i = 0; i < n1; i++)
908 if (arg[i].flag != -1)
911 if (arg[i].sym && (arg[i].sym->attr.optional
912 || (p1 && strcmp (arg[i].sym->name, p1) == 0)))
913 continue; /* Skip OPTIONAL and PASS arguments. */
917 /* Find other non-optional, non-pass arguments of the same type/rank. */
918 for (j = i + 1; j < n1; j++)
919 if ((arg[j].sym == NULL
920 || !(arg[j].sym->attr.optional
921 || (p1 && strcmp (arg[j].sym->name, p1) == 0)))
922 && (compare_type_rank_if (arg[i].sym, arg[j].sym)
923 || compare_type_rank_if (arg[j].sym, arg[i].sym)))
929 /* Now loop over each distinct type found in f1. */
933 for (i = 0; i < n1; i++)
935 if (arg[i].flag != k)
939 for (j = i + 1; j < n1; j++)
940 if (arg[j].flag == k)
943 /* Count the number of non-pass arguments in f2 with that type,
944 including those that are optional. */
947 for (f = f2; f; f = f->next)
948 if ((!p2 || strcmp (f->sym->name, p2) != 0)
949 && (compare_type_rank_if (arg[i].sym, f->sym)
950 || compare_type_rank_if (f->sym, arg[i].sym)))
968 /* Perform the correspondence test in rule (3) of F08:C1215.
969 Returns zero if no argument is found that satisfies this rule,
970 nonzero otherwise. 'p1' and 'p2' are the PASS arguments of both procedures
973 This test is also not symmetric in f1 and f2 and must be called
974 twice. This test finds problems caused by sorting the actual
975 argument list with keywords. For example:
979 INTEGER :: A ; REAL :: B
983 INTEGER :: A ; REAL :: B
987 At this point, 'CALL FOO(A=1, B=1.0)' is ambiguous. */
990 generic_correspondence (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
991 const char *p1, const char *p2)
993 gfc_formal_arglist *f2_save, *g;
1000 if (f1->sym->attr.optional)
1003 if (p1 && strcmp (f1->sym->name, p1) == 0)
1005 if (f2 && p2 && strcmp (f2->sym->name, p2) == 0)
1008 if (f2 != NULL && (compare_type_rank (f1->sym, f2->sym)
1009 || compare_type_rank (f2->sym, f1->sym))
1010 && !((gfc_option.allow_std & GFC_STD_F2008)
1011 && ((f1->sym->attr.allocatable && f2->sym->attr.pointer)
1012 || (f2->sym->attr.allocatable && f1->sym->attr.pointer))))
1015 /* Now search for a disambiguating keyword argument starting at
1016 the current non-match. */
1017 for (g = f1; g; g = g->next)
1019 if (g->sym->attr.optional || (p1 && strcmp (g->sym->name, p1) == 0))
1022 sym = find_keyword_arg (g->sym->name, f2_save);
1023 if (sym == NULL || !compare_type_rank (g->sym, sym)
1024 || ((gfc_option.allow_std & GFC_STD_F2008)
1025 && ((sym->attr.allocatable && g->sym->attr.pointer)
1026 || (sym->attr.pointer && g->sym->attr.allocatable))))
1042 symbol_rank (gfc_symbol *sym)
1045 as = (sym->ts.type == BT_CLASS) ? CLASS_DATA (sym)->as : sym->as;
1046 return as ? as->rank : 0;
1050 /* Check if the characteristics of two dummy arguments match,
1054 check_dummy_characteristics (gfc_symbol *s1, gfc_symbol *s2,
1055 bool type_must_agree, char *errmsg, int err_len)
1057 if (s1 == NULL || s2 == NULL)
1058 return s1 == s2 ? true : false;
1060 /* Check type and rank. */
1061 if (type_must_agree)
1063 if (!compare_type (s1, s2) || !compare_type (s2, s1))
1065 snprintf (errmsg, err_len, "Type mismatch in argument '%s' (%s/%s)",
1066 s1->name, gfc_typename (&s1->ts), gfc_typename (&s2->ts));
1069 if (!compare_rank (s1, s2))
1071 snprintf (errmsg, err_len, "Rank mismatch in argument '%s' (%i/%i)",
1072 s1->name, symbol_rank (s1), symbol_rank (s2));
1078 if (s1->attr.intent != s2->attr.intent)
1080 snprintf (errmsg, err_len, "INTENT mismatch in argument '%s'",
1085 /* Check OPTIONAL attribute. */
1086 if (s1->attr.optional != s2->attr.optional)
1088 snprintf (errmsg, err_len, "OPTIONAL mismatch in argument '%s'",
1093 /* Check ALLOCATABLE attribute. */
1094 if (s1->attr.allocatable != s2->attr.allocatable)
1096 snprintf (errmsg, err_len, "ALLOCATABLE mismatch in argument '%s'",
1101 /* Check POINTER attribute. */
1102 if (s1->attr.pointer != s2->attr.pointer)
1104 snprintf (errmsg, err_len, "POINTER mismatch in argument '%s'",
1109 /* Check TARGET attribute. */
1110 if (s1->attr.target != s2->attr.target)
1112 snprintf (errmsg, err_len, "TARGET mismatch in argument '%s'",
1117 /* FIXME: Do more comprehensive testing of attributes, like e.g.
1118 ASYNCHRONOUS, CONTIGUOUS, VALUE, VOLATILE, etc. */
1120 /* Check interface of dummy procedures. */
1121 if (s1->attr.flavor == FL_PROCEDURE)
1124 if (!gfc_compare_interfaces (s1, s2, s2->name, 0, 1, err, sizeof(err),
1127 snprintf (errmsg, err_len, "Interface mismatch in dummy procedure "
1128 "'%s': %s", s1->name, err);
1133 /* Check string length. */
1134 if (s1->ts.type == BT_CHARACTER
1135 && s1->ts.u.cl && s1->ts.u.cl->length
1136 && s2->ts.u.cl && s2->ts.u.cl->length)
1138 int compval = gfc_dep_compare_expr (s1->ts.u.cl->length,
1139 s2->ts.u.cl->length);
1145 snprintf (errmsg, err_len, "Character length mismatch "
1146 "in argument '%s'", s1->name);
1150 /* FIXME: Implement a warning for this case.
1151 gfc_warning ("Possible character length mismatch in argument '%s'",
1159 gfc_internal_error ("check_dummy_characteristics: Unexpected result "
1160 "%i of gfc_dep_compare_expr", compval);
1165 /* Check array shape. */
1166 if (s1->as && s2->as)
1169 gfc_expr *shape1, *shape2;
1171 if (s1->as->type != s2->as->type)
1173 snprintf (errmsg, err_len, "Shape mismatch in argument '%s'",
1178 if (s1->as->type == AS_EXPLICIT)
1179 for (i = 0; i < s1->as->rank + s1->as->corank; i++)
1181 shape1 = gfc_subtract (gfc_copy_expr (s1->as->upper[i]),
1182 gfc_copy_expr (s1->as->lower[i]));
1183 shape2 = gfc_subtract (gfc_copy_expr (s2->as->upper[i]),
1184 gfc_copy_expr (s2->as->lower[i]));
1185 compval = gfc_dep_compare_expr (shape1, shape2);
1186 gfc_free_expr (shape1);
1187 gfc_free_expr (shape2);
1193 snprintf (errmsg, err_len, "Shape mismatch in dimension %i of "
1194 "argument '%s'", i + 1, s1->name);
1198 /* FIXME: Implement a warning for this case.
1199 gfc_warning ("Possible shape mismatch in argument '%s'",
1207 gfc_internal_error ("check_dummy_characteristics: Unexpected "
1208 "result %i of gfc_dep_compare_expr",
1219 /* Check if the characteristics of two function results match,
1223 check_result_characteristics (gfc_symbol *s1, gfc_symbol *s2,
1224 char *errmsg, int err_len)
1226 gfc_symbol *r1, *r2;
1228 if (s1->ts.interface && s1->ts.interface->result)
1229 r1 = s1->ts.interface->result;
1231 r1 = s1->result ? s1->result : s1;
1233 if (s2->ts.interface && s2->ts.interface->result)
1234 r2 = s2->ts.interface->result;
1236 r2 = s2->result ? s2->result : s2;
1238 if (r1->ts.type == BT_UNKNOWN)
1241 /* Check type and rank. */
1242 if (!compare_type (r1, r2))
1244 snprintf (errmsg, err_len, "Type mismatch in function result (%s/%s)",
1245 gfc_typename (&r1->ts), gfc_typename (&r2->ts));
1248 if (!compare_rank (r1, r2))
1250 snprintf (errmsg, err_len, "Rank mismatch in function result (%i/%i)",
1251 symbol_rank (r1), symbol_rank (r2));
1255 /* Check ALLOCATABLE attribute. */
1256 if (r1->attr.allocatable != r2->attr.allocatable)
1258 snprintf (errmsg, err_len, "ALLOCATABLE attribute mismatch in "
1263 /* Check POINTER attribute. */
1264 if (r1->attr.pointer != r2->attr.pointer)
1266 snprintf (errmsg, err_len, "POINTER attribute mismatch in "
1271 /* Check CONTIGUOUS attribute. */
1272 if (r1->attr.contiguous != r2->attr.contiguous)
1274 snprintf (errmsg, err_len, "CONTIGUOUS attribute mismatch in "
1279 /* Check PROCEDURE POINTER attribute. */
1280 if (r1 != s1 && r1->attr.proc_pointer != r2->attr.proc_pointer)
1282 snprintf (errmsg, err_len, "PROCEDURE POINTER mismatch in "
1287 /* Check string length. */
1288 if (r1->ts.type == BT_CHARACTER && r1->ts.u.cl && r2->ts.u.cl)
1290 if (r1->ts.deferred != r2->ts.deferred)
1292 snprintf (errmsg, err_len, "Character length mismatch "
1293 "in function result");
1297 if (r1->ts.u.cl->length && r2->ts.u.cl->length)
1299 int compval = gfc_dep_compare_expr (r1->ts.u.cl->length,
1300 r2->ts.u.cl->length);
1306 snprintf (errmsg, err_len, "Character length mismatch "
1307 "in function result");
1311 /* FIXME: Implement a warning for this case.
1312 snprintf (errmsg, err_len, "Possible character length mismatch "
1313 "in function result");*/
1320 gfc_internal_error ("check_result_characteristics (1): Unexpected "
1321 "result %i of gfc_dep_compare_expr", compval);
1327 /* Check array shape. */
1328 if (!r1->attr.allocatable && !r1->attr.pointer && r1->as && r2->as)
1331 gfc_expr *shape1, *shape2;
1333 if (r1->as->type != r2->as->type)
1335 snprintf (errmsg, err_len, "Shape mismatch in function result");
1339 if (r1->as->type == AS_EXPLICIT)
1340 for (i = 0; i < r1->as->rank + r1->as->corank; i++)
1342 shape1 = gfc_subtract (gfc_copy_expr (r1->as->upper[i]),
1343 gfc_copy_expr (r1->as->lower[i]));
1344 shape2 = gfc_subtract (gfc_copy_expr (r2->as->upper[i]),
1345 gfc_copy_expr (r2->as->lower[i]));
1346 compval = gfc_dep_compare_expr (shape1, shape2);
1347 gfc_free_expr (shape1);
1348 gfc_free_expr (shape2);
1354 snprintf (errmsg, err_len, "Shape mismatch in dimension %i of "
1355 "function result", i + 1);
1359 /* FIXME: Implement a warning for this case.
1360 gfc_warning ("Possible shape mismatch in return value");*/
1367 gfc_internal_error ("check_result_characteristics (2): "
1368 "Unexpected result %i of "
1369 "gfc_dep_compare_expr", compval);
1379 /* 'Compare' two formal interfaces associated with a pair of symbols.
1380 We return nonzero if there exists an actual argument list that
1381 would be ambiguous between the two interfaces, zero otherwise.
1382 'strict_flag' specifies whether all the characteristics are
1383 required to match, which is not the case for ambiguity checks.
1384 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */
1387 gfc_compare_interfaces (gfc_symbol *s1, gfc_symbol *s2, const char *name2,
1388 int generic_flag, int strict_flag,
1389 char *errmsg, int err_len,
1390 const char *p1, const char *p2)
1392 gfc_formal_arglist *f1, *f2;
1394 gcc_assert (name2 != NULL);
1396 if (s1->attr.function && (s2->attr.subroutine
1397 || (!s2->attr.function && s2->ts.type == BT_UNKNOWN
1398 && gfc_get_default_type (name2, s2->ns)->type == BT_UNKNOWN)))
1401 snprintf (errmsg, err_len, "'%s' is not a function", name2);
1405 if (s1->attr.subroutine && s2->attr.function)
1408 snprintf (errmsg, err_len, "'%s' is not a subroutine", name2);
1412 /* Do strict checks on all characteristics
1413 (for dummy procedures and procedure pointer assignments). */
1414 if (!generic_flag && strict_flag)
1416 if (s1->attr.function && s2->attr.function)
1418 /* If both are functions, check result characteristics. */
1419 if (!check_result_characteristics (s1, s2, errmsg, err_len)
1420 || !check_result_characteristics (s2, s1, errmsg, err_len))
1424 if (s1->attr.pure && !s2->attr.pure)
1426 snprintf (errmsg, err_len, "Mismatch in PURE attribute");
1429 if (s1->attr.elemental && !s2->attr.elemental)
1431 snprintf (errmsg, err_len, "Mismatch in ELEMENTAL attribute");
1436 if (s1->attr.if_source == IFSRC_UNKNOWN
1437 || s2->attr.if_source == IFSRC_UNKNOWN)
1440 f1 = gfc_sym_get_dummy_args (s1);
1441 f2 = gfc_sym_get_dummy_args (s2);
1443 if (f1 == NULL && f2 == NULL)
1444 return 1; /* Special case: No arguments. */
1448 if (count_types_test (f1, f2, p1, p2)
1449 || count_types_test (f2, f1, p2, p1))
1451 if (generic_correspondence (f1, f2, p1, p2)
1452 || generic_correspondence (f2, f1, p2, p1))
1456 /* Perform the abbreviated correspondence test for operators (the
1457 arguments cannot be optional and are always ordered correctly).
1458 This is also done when comparing interfaces for dummy procedures and in
1459 procedure pointer assignments. */
1463 /* Check existence. */
1464 if (f1 == NULL && f2 == NULL)
1466 if (f1 == NULL || f2 == NULL)
1469 snprintf (errmsg, err_len, "'%s' has the wrong number of "
1470 "arguments", name2);
1474 if (UNLIMITED_POLY (f1->sym))
1479 /* Check all characteristics. */
1480 if (!check_dummy_characteristics (f1->sym, f2->sym, true,
1486 /* Only check type and rank. */
1487 if (!compare_type (f2->sym, f1->sym))
1490 snprintf (errmsg, err_len, "Type mismatch in argument '%s' "
1491 "(%s/%s)", f1->sym->name,
1492 gfc_typename (&f1->sym->ts),
1493 gfc_typename (&f2->sym->ts));
1496 if (!compare_rank (f2->sym, f1->sym))
1499 snprintf (errmsg, err_len, "Rank mismatch in argument '%s' "
1500 "(%i/%i)", f1->sym->name, symbol_rank (f1->sym),
1501 symbol_rank (f2->sym));
1514 /* Given a pointer to an interface pointer, remove duplicate
1515 interfaces and make sure that all symbols are either functions
1516 or subroutines, and all of the same kind. Returns nonzero if
1517 something goes wrong. */
1520 check_interface0 (gfc_interface *p, const char *interface_name)
1522 gfc_interface *psave, *q, *qlast;
1525 for (; p; p = p->next)
1527 /* Make sure all symbols in the interface have been defined as
1528 functions or subroutines. */
1529 if (((!p->sym->attr.function && !p->sym->attr.subroutine)
1530 || !p->sym->attr.if_source)
1531 && p->sym->attr.flavor != FL_DERIVED)
1533 if (p->sym->attr.external)
1534 gfc_error ("Procedure '%s' in %s at %L has no explicit interface",
1535 p->sym->name, interface_name, &p->sym->declared_at);
1537 gfc_error ("Procedure '%s' in %s at %L is neither function nor "
1538 "subroutine", p->sym->name, interface_name,
1539 &p->sym->declared_at);
1543 /* Verify that procedures are either all SUBROUTINEs or all FUNCTIONs. */
1544 if ((psave->sym->attr.function && !p->sym->attr.function
1545 && p->sym->attr.flavor != FL_DERIVED)
1546 || (psave->sym->attr.subroutine && !p->sym->attr.subroutine))
1548 if (p->sym->attr.flavor != FL_DERIVED)
1549 gfc_error ("In %s at %L procedures must be either all SUBROUTINEs"
1550 " or all FUNCTIONs", interface_name,
1551 &p->sym->declared_at);
1553 gfc_error ("In %s at %L procedures must be all FUNCTIONs as the "
1554 "generic name is also the name of a derived type",
1555 interface_name, &p->sym->declared_at);
1559 /* F2003, C1207. F2008, C1207. */
1560 if (p->sym->attr.proc == PROC_INTERNAL
1561 && !gfc_notify_std (GFC_STD_F2008, "Internal procedure "
1562 "'%s' in %s at %L", p->sym->name,
1563 interface_name, &p->sym->declared_at))
1568 /* Remove duplicate interfaces in this interface list. */
1569 for (; p; p = p->next)
1573 for (q = p->next; q;)
1575 if (p->sym != q->sym)
1582 /* Duplicate interface. */
1583 qlast->next = q->next;
1594 /* Check lists of interfaces to make sure that no two interfaces are
1595 ambiguous. Duplicate interfaces (from the same symbol) are OK here. */
1598 check_interface1 (gfc_interface *p, gfc_interface *q0,
1599 int generic_flag, const char *interface_name,
1603 for (; p; p = p->next)
1604 for (q = q0; q; q = q->next)
1606 if (p->sym == q->sym)
1607 continue; /* Duplicates OK here. */
1609 if (p->sym->name == q->sym->name && p->sym->module == q->sym->module)
1612 if (p->sym->attr.flavor != FL_DERIVED
1613 && q->sym->attr.flavor != FL_DERIVED
1614 && gfc_compare_interfaces (p->sym, q->sym, q->sym->name,
1615 generic_flag, 0, NULL, 0, NULL, NULL))
1618 gfc_error ("Ambiguous interfaces '%s' and '%s' in %s at %L",
1619 p->sym->name, q->sym->name, interface_name,
1621 else if (!p->sym->attr.use_assoc && q->sym->attr.use_assoc)
1622 gfc_warning ("Ambiguous interfaces '%s' and '%s' in %s at %L",
1623 p->sym->name, q->sym->name, interface_name,
1626 gfc_warning ("Although not referenced, '%s' has ambiguous "
1627 "interfaces at %L", interface_name, &p->where);
1635 /* Check the generic and operator interfaces of symbols to make sure
1636 that none of the interfaces conflict. The check has to be done
1637 after all of the symbols are actually loaded. */
1640 check_sym_interfaces (gfc_symbol *sym)
1642 char interface_name[100];
1645 if (sym->ns != gfc_current_ns)
1648 if (sym->generic != NULL)
1650 sprintf (interface_name, "generic interface '%s'", sym->name);
1651 if (check_interface0 (sym->generic, interface_name))
1654 for (p = sym->generic; p; p = p->next)
1656 if (p->sym->attr.mod_proc
1657 && (p->sym->attr.if_source != IFSRC_DECL
1658 || p->sym->attr.procedure))
1660 gfc_error ("'%s' at %L is not a module procedure",
1661 p->sym->name, &p->where);
1666 /* Originally, this test was applied to host interfaces too;
1667 this is incorrect since host associated symbols, from any
1668 source, cannot be ambiguous with local symbols. */
1669 check_interface1 (sym->generic, sym->generic, 1, interface_name,
1670 sym->attr.referenced || !sym->attr.use_assoc);
1676 check_uop_interfaces (gfc_user_op *uop)
1678 char interface_name[100];
1682 sprintf (interface_name, "operator interface '%s'", uop->name);
1683 if (check_interface0 (uop->op, interface_name))
1686 for (ns = gfc_current_ns; ns; ns = ns->parent)
1688 uop2 = gfc_find_uop (uop->name, ns);
1692 check_interface1 (uop->op, uop2->op, 0,
1693 interface_name, true);
1697 /* Given an intrinsic op, return an equivalent op if one exists,
1698 or INTRINSIC_NONE otherwise. */
1701 gfc_equivalent_op (gfc_intrinsic_op op)
1706 return INTRINSIC_EQ_OS;
1708 case INTRINSIC_EQ_OS:
1709 return INTRINSIC_EQ;
1712 return INTRINSIC_NE_OS;
1714 case INTRINSIC_NE_OS:
1715 return INTRINSIC_NE;
1718 return INTRINSIC_GT_OS;
1720 case INTRINSIC_GT_OS:
1721 return INTRINSIC_GT;
1724 return INTRINSIC_GE_OS;
1726 case INTRINSIC_GE_OS:
1727 return INTRINSIC_GE;
1730 return INTRINSIC_LT_OS;
1732 case INTRINSIC_LT_OS:
1733 return INTRINSIC_LT;
1736 return INTRINSIC_LE_OS;
1738 case INTRINSIC_LE_OS:
1739 return INTRINSIC_LE;
1742 return INTRINSIC_NONE;
1746 /* For the namespace, check generic, user operator and intrinsic
1747 operator interfaces for consistency and to remove duplicate
1748 interfaces. We traverse the whole namespace, counting on the fact
1749 that most symbols will not have generic or operator interfaces. */
1752 gfc_check_interfaces (gfc_namespace *ns)
1754 gfc_namespace *old_ns, *ns2;
1755 char interface_name[100];
1758 old_ns = gfc_current_ns;
1759 gfc_current_ns = ns;
1761 gfc_traverse_ns (ns, check_sym_interfaces);
1763 gfc_traverse_user_op (ns, check_uop_interfaces);
1765 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
1767 if (i == INTRINSIC_USER)
1770 if (i == INTRINSIC_ASSIGN)
1771 strcpy (interface_name, "intrinsic assignment operator");
1773 sprintf (interface_name, "intrinsic '%s' operator",
1774 gfc_op2string ((gfc_intrinsic_op) i));
1776 if (check_interface0 (ns->op[i], interface_name))
1780 gfc_check_operator_interface (ns->op[i]->sym, (gfc_intrinsic_op) i,
1783 for (ns2 = ns; ns2; ns2 = ns2->parent)
1785 gfc_intrinsic_op other_op;
1787 if (check_interface1 (ns->op[i], ns2->op[i], 0,
1788 interface_name, true))
1791 /* i should be gfc_intrinsic_op, but has to be int with this cast
1792 here for stupid C++ compatibility rules. */
1793 other_op = gfc_equivalent_op ((gfc_intrinsic_op) i);
1794 if (other_op != INTRINSIC_NONE
1795 && check_interface1 (ns->op[i], ns2->op[other_op],
1796 0, interface_name, true))
1802 gfc_current_ns = old_ns;
1806 /* Given a symbol of a formal argument list and an expression, if the
1807 formal argument is allocatable, check that the actual argument is
1808 allocatable. Returns nonzero if compatible, zero if not compatible. */
1811 compare_allocatable (gfc_symbol *formal, gfc_expr *actual)
1813 symbol_attribute attr;
1815 if (formal->attr.allocatable
1816 || (formal->ts.type == BT_CLASS && CLASS_DATA (formal)->attr.allocatable))
1818 attr = gfc_expr_attr (actual);
1819 if (!attr.allocatable)
1827 /* Given a symbol of a formal argument list and an expression, if the
1828 formal argument is a pointer, see if the actual argument is a
1829 pointer. Returns nonzero if compatible, zero if not compatible. */
1832 compare_pointer (gfc_symbol *formal, gfc_expr *actual)
1834 symbol_attribute attr;
1836 if (formal->attr.pointer
1837 || (formal->ts.type == BT_CLASS && CLASS_DATA (formal)
1838 && CLASS_DATA (formal)->attr.class_pointer))
1840 attr = gfc_expr_attr (actual);
1842 /* Fortran 2008 allows non-pointer actual arguments. */
1843 if (!attr.pointer && attr.target && formal->attr.intent == INTENT_IN)
1854 /* Emit clear error messages for rank mismatch. */
1857 argument_rank_mismatch (const char *name, locus *where,
1858 int rank1, int rank2)
1861 /* TS 29113, C407b. */
1864 gfc_error ("The assumed-rank array at %L requires that the dummy argument"
1865 " '%s' has assumed-rank", where, name);
1867 else if (rank1 == 0)
1869 gfc_error ("Rank mismatch in argument '%s' at %L "
1870 "(scalar and rank-%d)", name, where, rank2);
1872 else if (rank2 == 0)
1874 gfc_error ("Rank mismatch in argument '%s' at %L "
1875 "(rank-%d and scalar)", name, where, rank1);
1879 gfc_error ("Rank mismatch in argument '%s' at %L "
1880 "(rank-%d and rank-%d)", name, where, rank1, rank2);
1885 /* Given a symbol of a formal argument list and an expression, see if
1886 the two are compatible as arguments. Returns nonzero if
1887 compatible, zero if not compatible. */
1890 compare_parameter (gfc_symbol *formal, gfc_expr *actual,
1891 int ranks_must_agree, int is_elemental, locus *where)
1894 bool rank_check, is_pointer;
1896 /* If the formal arg has type BT_VOID, it's to one of the iso_c_binding
1897 procs c_f_pointer or c_f_procpointer, and we need to accept most
1898 pointers the user could give us. This should allow that. */
1899 if (formal->ts.type == BT_VOID)
1902 if (formal->ts.type == BT_DERIVED
1903 && formal->ts.u.derived && formal->ts.u.derived->ts.is_iso_c
1904 && actual->ts.type == BT_DERIVED
1905 && actual->ts.u.derived && actual->ts.u.derived->ts.is_iso_c)
1908 if (formal->ts.type == BT_CLASS && actual->ts.type == BT_DERIVED)
1909 /* Make sure the vtab symbol is present when
1910 the module variables are generated. */
1911 gfc_find_derived_vtab (actual->ts.u.derived);
1913 if (actual->ts.type == BT_PROCEDURE)
1916 gfc_symbol *act_sym = actual->symtree->n.sym;
1918 if (formal->attr.flavor != FL_PROCEDURE)
1921 gfc_error ("Invalid procedure argument at %L", &actual->where);
1925 if (!gfc_compare_interfaces (formal, act_sym, act_sym->name, 0, 1, err,
1926 sizeof(err), NULL, NULL))
1929 gfc_error ("Interface mismatch in dummy procedure '%s' at %L: %s",
1930 formal->name, &actual->where, err);
1934 if (formal->attr.function && !act_sym->attr.function)
1936 gfc_add_function (&act_sym->attr, act_sym->name,
1937 &act_sym->declared_at);
1938 if (act_sym->ts.type == BT_UNKNOWN
1939 && !gfc_set_default_type (act_sym, 1, act_sym->ns))
1942 else if (formal->attr.subroutine && !act_sym->attr.subroutine)
1943 gfc_add_subroutine (&act_sym->attr, act_sym->name,
1944 &act_sym->declared_at);
1950 if (formal->attr.pointer && formal->attr.contiguous
1951 && !gfc_is_simply_contiguous (actual, true))
1954 gfc_error ("Actual argument to contiguous pointer dummy '%s' at %L "
1955 "must be simply contiguous", formal->name, &actual->where);
1959 if ((actual->expr_type != EXPR_NULL || actual->ts.type != BT_UNKNOWN)
1960 && actual->ts.type != BT_HOLLERITH
1961 && formal->ts.type != BT_ASSUMED
1962 && !(formal->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
1963 && !gfc_compare_types (&formal->ts, &actual->ts)
1964 && !(formal->ts.type == BT_DERIVED && actual->ts.type == BT_CLASS
1965 && gfc_compare_derived_types (formal->ts.u.derived,
1966 CLASS_DATA (actual)->ts.u.derived)))
1969 gfc_error ("Type mismatch in argument '%s' at %L; passed %s to %s",
1970 formal->name, &actual->where, gfc_typename (&actual->ts),
1971 gfc_typename (&formal->ts));
1975 /* F2008, 12.5.2.5; IR F08/0073. */
1976 if (formal->ts.type == BT_CLASS && formal->attr.class_ok
1977 && actual->expr_type != EXPR_NULL
1978 && ((CLASS_DATA (formal)->attr.class_pointer
1979 && !formal->attr.intent == INTENT_IN)
1980 || CLASS_DATA (formal)->attr.allocatable))
1982 if (actual->ts.type != BT_CLASS)
1985 gfc_error ("Actual argument to '%s' at %L must be polymorphic",
1986 formal->name, &actual->where);
1990 if (!gfc_expr_attr (actual).class_ok)
1993 if (!gfc_compare_derived_types (CLASS_DATA (actual)->ts.u.derived,
1994 CLASS_DATA (formal)->ts.u.derived))
1997 gfc_error ("Actual argument to '%s' at %L must have the same "
1998 "declared type", formal->name, &actual->where);
2003 /* F08: 12.5.2.5 Allocatable and pointer dummy variables. However, this
2004 is necessary also for F03, so retain error for both.
2005 NOTE: Other type/kind errors pre-empt this error. Since they are F03
2006 compatible, no attempt has been made to channel to this one. */
2007 if (UNLIMITED_POLY (formal) && !UNLIMITED_POLY (actual)
2008 && (CLASS_DATA (formal)->attr.allocatable
2009 ||CLASS_DATA (formal)->attr.class_pointer))
2012 gfc_error ("Actual argument to '%s' at %L must be unlimited "
2013 "polymorphic since the formal argument is a "
2014 "pointer or allocatable unlimited polymorphic "
2015 "entity [F2008: 12.5.2.5]", formal->name,
2020 if (formal->attr.codimension && !gfc_is_coarray (actual))
2023 gfc_error ("Actual argument to '%s' at %L must be a coarray",
2024 formal->name, &actual->where);
2028 if (formal->attr.codimension && formal->attr.allocatable)
2030 gfc_ref *last = NULL;
2032 for (ref = actual->ref; ref; ref = ref->next)
2033 if (ref->type == REF_COMPONENT)
2036 /* F2008, 12.5.2.6. */
2037 if ((last && last->u.c.component->as->corank != formal->as->corank)
2039 && actual->symtree->n.sym->as->corank != formal->as->corank))
2042 gfc_error ("Corank mismatch in argument '%s' at %L (%d and %d)",
2043 formal->name, &actual->where, formal->as->corank,
2044 last ? last->u.c.component->as->corank
2045 : actual->symtree->n.sym->as->corank);
2050 if (formal->attr.codimension)
2052 /* F2008, 12.5.2.8. */
2053 if (formal->attr.dimension
2054 && (formal->attr.contiguous || formal->as->type != AS_ASSUMED_SHAPE)
2055 && gfc_expr_attr (actual).dimension
2056 && !gfc_is_simply_contiguous (actual, true))
2059 gfc_error ("Actual argument to '%s' at %L must be simply "
2060 "contiguous", formal->name, &actual->where);
2064 /* F2008, C1303 and C1304. */
2065 if (formal->attr.intent != INTENT_INOUT
2066 && (((formal->ts.type == BT_DERIVED || formal->ts.type == BT_CLASS)
2067 && formal->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2068 && formal->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
2069 || formal->attr.lock_comp))
2073 gfc_error ("Actual argument to non-INTENT(INOUT) dummy '%s' at %L, "
2074 "which is LOCK_TYPE or has a LOCK_TYPE component",
2075 formal->name, &actual->where);
2080 /* F2008, C1239/C1240. */
2081 if (actual->expr_type == EXPR_VARIABLE
2082 && (actual->symtree->n.sym->attr.asynchronous
2083 || actual->symtree->n.sym->attr.volatile_)
2084 && (formal->attr.asynchronous || formal->attr.volatile_)
2085 && actual->rank && !gfc_is_simply_contiguous (actual, true)
2086 && ((formal->as->type != AS_ASSUMED_SHAPE
2087 && formal->as->type != AS_ASSUMED_RANK && !formal->attr.pointer)
2088 || formal->attr.contiguous))
2091 gfc_error ("Dummy argument '%s' has to be a pointer, assumed-shape or "
2092 "assumed-rank array without CONTIGUOUS attribute - as actual"
2093 " argument at %L is not simply contiguous and both are "
2094 "ASYNCHRONOUS or VOLATILE", formal->name, &actual->where);
2098 if (formal->attr.allocatable && !formal->attr.codimension
2099 && gfc_expr_attr (actual).codimension)
2101 if (formal->attr.intent == INTENT_OUT)
2104 gfc_error ("Passing coarray at %L to allocatable, noncoarray, "
2105 "INTENT(OUT) dummy argument '%s'", &actual->where,
2109 else if (gfc_option.warn_surprising && where
2110 && formal->attr.intent != INTENT_IN)
2111 gfc_warning ("Passing coarray at %L to allocatable, noncoarray dummy "
2112 "argument '%s', which is invalid if the allocation status"
2113 " is modified", &actual->where, formal->name);
2116 /* If the rank is the same or the formal argument has assumed-rank. */
2117 if (symbol_rank (formal) == actual->rank || symbol_rank (formal) == -1)
2120 if (actual->ts.type == BT_CLASS && CLASS_DATA (actual)->as
2121 && CLASS_DATA (actual)->as->rank == symbol_rank (formal))
2124 rank_check = where != NULL && !is_elemental && formal->as
2125 && (formal->as->type == AS_ASSUMED_SHAPE
2126 || formal->as->type == AS_DEFERRED)
2127 && actual->expr_type != EXPR_NULL;
2129 /* Skip rank checks for NO_ARG_CHECK. */
2130 if (formal->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
2133 /* Scalar & coindexed, see: F2008, Section 12.5.2.4. */
2134 if (rank_check || ranks_must_agree
2135 || (formal->attr.pointer && actual->expr_type != EXPR_NULL)
2136 || (actual->rank != 0 && !(is_elemental || formal->attr.dimension))
2137 || (actual->rank == 0
2138 && ((formal->ts.type == BT_CLASS
2139 && CLASS_DATA (formal)->as->type == AS_ASSUMED_SHAPE)
2140 || (formal->ts.type != BT_CLASS
2141 && formal->as->type == AS_ASSUMED_SHAPE))
2142 && actual->expr_type != EXPR_NULL)
2143 || (actual->rank == 0 && formal->attr.dimension
2144 && gfc_is_coindexed (actual)))
2147 argument_rank_mismatch (formal->name, &actual->where,
2148 symbol_rank (formal), actual->rank);
2151 else if (actual->rank != 0 && (is_elemental || formal->attr.dimension))
2154 /* At this point, we are considering a scalar passed to an array. This
2155 is valid (cf. F95 12.4.1.1, F2003 12.4.1.2, and F2008 12.5.2.4),
2156 - if the actual argument is (a substring of) an element of a
2157 non-assumed-shape/non-pointer/non-polymorphic array; or
2158 - (F2003) if the actual argument is of type character of default/c_char
2161 is_pointer = actual->expr_type == EXPR_VARIABLE
2162 ? actual->symtree->n.sym->attr.pointer : false;
2164 for (ref = actual->ref; ref; ref = ref->next)
2166 if (ref->type == REF_COMPONENT)
2167 is_pointer = ref->u.c.component->attr.pointer;
2168 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT
2169 && ref->u.ar.dimen > 0
2171 || (ref->next->type == REF_SUBSTRING && !ref->next->next)))
2175 if (actual->ts.type == BT_CLASS && actual->expr_type != EXPR_NULL)
2178 gfc_error ("Polymorphic scalar passed to array dummy argument '%s' "
2179 "at %L", formal->name, &actual->where);
2183 if (actual->expr_type != EXPR_NULL && ref && actual->ts.type != BT_CHARACTER
2184 && (is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE))
2187 gfc_error ("Element of assumed-shaped or pointer "
2188 "array passed to array dummy argument '%s' at %L",
2189 formal->name, &actual->where);
2193 if (actual->ts.type == BT_CHARACTER && actual->expr_type != EXPR_NULL
2194 && (!ref || is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE))
2196 if (formal->ts.kind != 1 && (gfc_option.allow_std & GFC_STD_GNU) == 0)
2199 gfc_error ("Extension: Scalar non-default-kind, non-C_CHAR-kind "
2200 "CHARACTER actual argument with array dummy argument "
2201 "'%s' at %L", formal->name, &actual->where);
2205 if (where && (gfc_option.allow_std & GFC_STD_F2003) == 0)
2207 gfc_error ("Fortran 2003: Scalar CHARACTER actual argument with "
2208 "array dummy argument '%s' at %L",
2209 formal->name, &actual->where);
2212 else if ((gfc_option.allow_std & GFC_STD_F2003) == 0)
2218 if (ref == NULL && actual->expr_type != EXPR_NULL)
2221 argument_rank_mismatch (formal->name, &actual->where,
2222 symbol_rank (formal), actual->rank);
2230 /* Returns the storage size of a symbol (formal argument) or
2231 zero if it cannot be determined. */
2233 static unsigned long
2234 get_sym_storage_size (gfc_symbol *sym)
2237 unsigned long strlen, elements;
2239 if (sym->ts.type == BT_CHARACTER)
2241 if (sym->ts.u.cl && sym->ts.u.cl->length
2242 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
2243 strlen = mpz_get_ui (sym->ts.u.cl->length->value.integer);
2250 if (symbol_rank (sym) == 0)
2254 if (sym->as->type != AS_EXPLICIT)
2256 for (i = 0; i < sym->as->rank; i++)
2258 if (sym->as->upper[i]->expr_type != EXPR_CONSTANT
2259 || sym->as->lower[i]->expr_type != EXPR_CONSTANT)
2262 elements *= mpz_get_si (sym->as->upper[i]->value.integer)
2263 - mpz_get_si (sym->as->lower[i]->value.integer) + 1L;
2266 return strlen*elements;
2270 /* Returns the storage size of an expression (actual argument) or
2271 zero if it cannot be determined. For an array element, it returns
2272 the remaining size as the element sequence consists of all storage
2273 units of the actual argument up to the end of the array. */
2275 static unsigned long
2276 get_expr_storage_size (gfc_expr *e)
2279 long int strlen, elements;
2280 long int substrlen = 0;
2281 bool is_str_storage = false;
2287 if (e->ts.type == BT_CHARACTER)
2289 if (e->ts.u.cl && e->ts.u.cl->length
2290 && e->ts.u.cl->length->expr_type == EXPR_CONSTANT)
2291 strlen = mpz_get_si (e->ts.u.cl->length->value.integer);
2292 else if (e->expr_type == EXPR_CONSTANT
2293 && (e->ts.u.cl == NULL || e->ts.u.cl->length == NULL))
2294 strlen = e->value.character.length;
2299 strlen = 1; /* Length per element. */
2301 if (e->rank == 0 && !e->ref)
2309 for (i = 0; i < e->rank; i++)
2310 elements *= mpz_get_si (e->shape[i]);
2311 return elements*strlen;
2314 for (ref = e->ref; ref; ref = ref->next)
2316 if (ref->type == REF_SUBSTRING && ref->u.ss.start
2317 && ref->u.ss.start->expr_type == EXPR_CONSTANT)
2321 /* The string length is the substring length.
2322 Set now to full string length. */
2323 if (!ref->u.ss.length || !ref->u.ss.length->length
2324 || ref->u.ss.length->length->expr_type != EXPR_CONSTANT)
2327 strlen = mpz_get_ui (ref->u.ss.length->length->value.integer);
2329 substrlen = strlen - mpz_get_ui (ref->u.ss.start->value.integer) + 1;
2333 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
2334 for (i = 0; i < ref->u.ar.dimen; i++)
2336 long int start, end, stride;
2339 if (ref->u.ar.stride[i])
2341 if (ref->u.ar.stride[i]->expr_type == EXPR_CONSTANT)
2342 stride = mpz_get_si (ref->u.ar.stride[i]->value.integer);
2347 if (ref->u.ar.start[i])
2349 if (ref->u.ar.start[i]->expr_type == EXPR_CONSTANT)
2350 start = mpz_get_si (ref->u.ar.start[i]->value.integer);
2354 else if (ref->u.ar.as->lower[i]
2355 && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT)
2356 start = mpz_get_si (ref->u.ar.as->lower[i]->value.integer);
2360 if (ref->u.ar.end[i])
2362 if (ref->u.ar.end[i]->expr_type == EXPR_CONSTANT)
2363 end = mpz_get_si (ref->u.ar.end[i]->value.integer);
2367 else if (ref->u.ar.as->upper[i]
2368 && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT)
2369 end = mpz_get_si (ref->u.ar.as->upper[i]->value.integer);
2373 elements *= (end - start)/stride + 1L;
2375 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_FULL)
2376 for (i = 0; i < ref->u.ar.as->rank; i++)
2378 if (ref->u.ar.as->lower[i] && ref->u.ar.as->upper[i]
2379 && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT
2380 && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT)
2381 elements *= mpz_get_si (ref->u.ar.as->upper[i]->value.integer)
2382 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer)
2387 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT
2388 && e->expr_type == EXPR_VARIABLE)
2390 if (ref->u.ar.as->type == AS_ASSUMED_SHAPE
2391 || e->symtree->n.sym->attr.pointer)
2397 /* Determine the number of remaining elements in the element
2398 sequence for array element designators. */
2399 is_str_storage = true;
2400 for (i = ref->u.ar.dimen - 1; i >= 0; i--)
2402 if (ref->u.ar.start[i] == NULL
2403 || ref->u.ar.start[i]->expr_type != EXPR_CONSTANT
2404 || ref->u.ar.as->upper[i] == NULL
2405 || ref->u.ar.as->lower[i] == NULL
2406 || ref->u.ar.as->upper[i]->expr_type != EXPR_CONSTANT
2407 || ref->u.ar.as->lower[i]->expr_type != EXPR_CONSTANT)
2412 * (mpz_get_si (ref->u.ar.as->upper[i]->value.integer)
2413 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer)
2415 - (mpz_get_si (ref->u.ar.start[i]->value.integer)
2416 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer));
2422 return (is_str_storage) ? substrlen + (elements-1)*strlen
2425 return elements*strlen;
2429 /* Given an expression, check whether it is an array section
2430 which has a vector subscript. If it has, one is returned,
2434 gfc_has_vector_subscript (gfc_expr *e)
2439 if (e == NULL || e->rank == 0 || e->expr_type != EXPR_VARIABLE)
2442 for (ref = e->ref; ref; ref = ref->next)
2443 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
2444 for (i = 0; i < ref->u.ar.dimen; i++)
2445 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
2452 /* Given formal and actual argument lists, see if they are compatible.
2453 If they are compatible, the actual argument list is sorted to
2454 correspond with the formal list, and elements for missing optional
2455 arguments are inserted. If WHERE pointer is nonnull, then we issue
2456 errors when things don't match instead of just returning the status
2460 compare_actual_formal (gfc_actual_arglist **ap, gfc_formal_arglist *formal,
2461 int ranks_must_agree, int is_elemental, locus *where)
2463 gfc_actual_arglist **new_arg, *a, *actual, temp;
2464 gfc_formal_arglist *f;
2466 unsigned long actual_size, formal_size;
2467 bool full_array = false;
2471 if (actual == NULL && formal == NULL)
2475 for (f = formal; f; f = f->next)
2478 new_arg = XALLOCAVEC (gfc_actual_arglist *, n);
2480 for (i = 0; i < n; i++)
2487 for (a = actual; a; a = a->next, f = f->next)
2489 /* Look for keywords but ignore g77 extensions like %VAL. */
2490 if (a->name != NULL && a->name[0] != '%')
2493 for (f = formal; f; f = f->next, i++)
2497 if (strcmp (f->sym->name, a->name) == 0)
2504 gfc_error ("Keyword argument '%s' at %L is not in "
2505 "the procedure", a->name, &a->expr->where);
2509 if (new_arg[i] != NULL)
2512 gfc_error ("Keyword argument '%s' at %L is already associated "
2513 "with another actual argument", a->name,
2522 gfc_error ("More actual than formal arguments in procedure "
2523 "call at %L", where);
2528 if (f->sym == NULL && a->expr == NULL)
2534 gfc_error ("Missing alternate return spec in subroutine call "
2539 if (a->expr == NULL)
2542 gfc_error ("Unexpected alternate return spec in subroutine "
2543 "call at %L", where);
2547 /* Make sure that intrinsic vtables exist for calls to unlimited
2548 polymorphic formal arguments. */
2549 if (UNLIMITED_POLY (f->sym)
2550 && a->expr->ts.type != BT_DERIVED
2551 && a->expr->ts.type != BT_CLASS)
2552 gfc_find_intrinsic_vtab (&a->expr->ts);
2554 if (a->expr->expr_type == EXPR_NULL
2555 && ((f->sym->ts.type != BT_CLASS && !f->sym->attr.pointer
2556 && (f->sym->attr.allocatable || !f->sym->attr.optional
2557 || (gfc_option.allow_std & GFC_STD_F2008) == 0))
2558 || (f->sym->ts.type == BT_CLASS
2559 && !CLASS_DATA (f->sym)->attr.class_pointer
2560 && (CLASS_DATA (f->sym)->attr.allocatable
2561 || !f->sym->attr.optional
2562 || (gfc_option.allow_std & GFC_STD_F2008) == 0))))
2565 && (!f->sym->attr.optional
2566 || (f->sym->ts.type != BT_CLASS && f->sym->attr.allocatable)
2567 || (f->sym->ts.type == BT_CLASS
2568 && CLASS_DATA (f->sym)->attr.allocatable)))
2569 gfc_error ("Unexpected NULL() intrinsic at %L to dummy '%s'",
2570 where, f->sym->name);
2572 gfc_error ("Fortran 2008: Null pointer at %L to non-pointer "
2573 "dummy '%s'", where, f->sym->name);
2578 if (!compare_parameter (f->sym, a->expr, ranks_must_agree,
2579 is_elemental, where))
2582 /* TS 29113, 6.3p2. */
2583 if (f->sym->ts.type == BT_ASSUMED
2584 && (a->expr->ts.type == BT_DERIVED
2585 || (a->expr->ts.type == BT_CLASS && CLASS_DATA (a->expr))))
2587 gfc_namespace *f2k_derived;
2589 f2k_derived = a->expr->ts.type == BT_DERIVED
2590 ? a->expr->ts.u.derived->f2k_derived
2591 : CLASS_DATA (a->expr)->ts.u.derived->f2k_derived;
2594 && (f2k_derived->finalizers || f2k_derived->tb_sym_root))
2596 gfc_error ("Actual argument at %L to assumed-type dummy is of "
2597 "derived type with type-bound or FINAL procedures",
2603 /* Special case for character arguments. For allocatable, pointer
2604 and assumed-shape dummies, the string length needs to match
2606 if (a->expr->ts.type == BT_CHARACTER
2607 && a->expr->ts.u.cl && a->expr->ts.u.cl->length
2608 && a->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
2609 && f->sym->ts.u.cl && f->sym->ts.u.cl && f->sym->ts.u.cl->length
2610 && f->sym->ts.u.cl->length->expr_type == EXPR_CONSTANT
2611 && (f->sym->attr.pointer || f->sym->attr.allocatable
2612 || (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2613 && (mpz_cmp (a->expr->ts.u.cl->length->value.integer,
2614 f->sym->ts.u.cl->length->value.integer) != 0))
2616 if (where && (f->sym->attr.pointer || f->sym->attr.allocatable))
2617 gfc_warning ("Character length mismatch (%ld/%ld) between actual "
2618 "argument and pointer or allocatable dummy argument "
2620 mpz_get_si (a->expr->ts.u.cl->length->value.integer),
2621 mpz_get_si (f->sym->ts.u.cl->length->value.integer),
2622 f->sym->name, &a->expr->where);
2624 gfc_warning ("Character length mismatch (%ld/%ld) between actual "
2625 "argument and assumed-shape dummy argument '%s' "
2627 mpz_get_si (a->expr->ts.u.cl->length->value.integer),
2628 mpz_get_si (f->sym->ts.u.cl->length->value.integer),
2629 f->sym->name, &a->expr->where);
2633 if ((f->sym->attr.pointer || f->sym->attr.allocatable)
2634 && f->sym->ts.deferred != a->expr->ts.deferred
2635 && a->expr->ts.type == BT_CHARACTER)
2638 gfc_error ("Actual argument at %L to allocatable or "
2639 "pointer dummy argument '%s' must have a deferred "
2640 "length type parameter if and only if the dummy has one",
2641 &a->expr->where, f->sym->name);
2645 if (f->sym->ts.type == BT_CLASS)
2646 goto skip_size_check;
2648 actual_size = get_expr_storage_size (a->expr);
2649 formal_size = get_sym_storage_size (f->sym);
2650 if (actual_size != 0 && actual_size < formal_size
2651 && a->expr->ts.type != BT_PROCEDURE
2652 && f->sym->attr.flavor != FL_PROCEDURE)
2654 if (a->expr->ts.type == BT_CHARACTER && !f->sym->as && where)
2655 gfc_warning ("Character length of actual argument shorter "
2656 "than of dummy argument '%s' (%lu/%lu) at %L",
2657 f->sym->name, actual_size, formal_size,
2660 gfc_warning ("Actual argument contains too few "
2661 "elements for dummy argument '%s' (%lu/%lu) at %L",
2662 f->sym->name, actual_size, formal_size,
2669 /* Satisfy F03:12.4.1.3 by ensuring that a procedure pointer actual
2670 argument is provided for a procedure pointer formal argument. */
2671 if (f->sym->attr.proc_pointer
2672 && !((a->expr->expr_type == EXPR_VARIABLE
2673 && a->expr->symtree->n.sym->attr.proc_pointer)
2674 || (a->expr->expr_type == EXPR_FUNCTION
2675 && a->expr->symtree->n.sym->result->attr.proc_pointer)
2676 || gfc_is_proc_ptr_comp (a->expr)))
2679 gfc_error ("Expected a procedure pointer for argument '%s' at %L",
2680 f->sym->name, &a->expr->where);
2684 /* Satisfy F03:12.4.1.3 by ensuring that a procedure actual argument is
2685 provided for a procedure formal argument. */
2686 if (f->sym->attr.flavor == FL_PROCEDURE
2687 && gfc_expr_attr (a->expr).flavor != FL_PROCEDURE)
2690 gfc_error ("Expected a procedure for argument '%s' at %L",
2691 f->sym->name, &a->expr->where);
2695 if (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE
2696 && a->expr->expr_type == EXPR_VARIABLE
2697 && a->expr->symtree->n.sym->as
2698 && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SIZE
2699 && (a->expr->ref == NULL
2700 || (a->expr->ref->type == REF_ARRAY
2701 && a->expr->ref->u.ar.type == AR_FULL)))
2704 gfc_error ("Actual argument for '%s' cannot be an assumed-size"
2705 " array at %L", f->sym->name, where);
2709 if (a->expr->expr_type != EXPR_NULL
2710 && compare_pointer (f->sym, a->expr) == 0)
2713 gfc_error ("Actual argument for '%s' must be a pointer at %L",
2714 f->sym->name, &a->expr->where);
2718 if (a->expr->expr_type != EXPR_NULL
2719 && (gfc_option.allow_std & GFC_STD_F2008) == 0
2720 && compare_pointer (f->sym, a->expr) == 2)
2723 gfc_error ("Fortran 2008: Non-pointer actual argument at %L to "
2724 "pointer dummy '%s'", &a->expr->where,f->sym->name);
2729 /* Fortran 2008, C1242. */
2730 if (f->sym->attr.pointer && gfc_is_coindexed (a->expr))
2733 gfc_error ("Coindexed actual argument at %L to pointer "
2735 &a->expr->where, f->sym->name);
2739 /* Fortran 2008, 12.5.2.5 (no constraint). */
2740 if (a->expr->expr_type == EXPR_VARIABLE
2741 && f->sym->attr.intent != INTENT_IN
2742 && f->sym->attr.allocatable
2743 && gfc_is_coindexed (a->expr))
2746 gfc_error ("Coindexed actual argument at %L to allocatable "
2747 "dummy '%s' requires INTENT(IN)",
2748 &a->expr->where, f->sym->name);
2752 /* Fortran 2008, C1237. */
2753 if (a->expr->expr_type == EXPR_VARIABLE
2754 && (f->sym->attr.asynchronous || f->sym->attr.volatile_)
2755 && gfc_is_coindexed (a->expr)
2756 && (a->expr->symtree->n.sym->attr.volatile_
2757 || a->expr->symtree->n.sym->attr.asynchronous))
2760 gfc_error ("Coindexed ASYNCHRONOUS or VOLATILE actual argument at "
2761 "%L requires that dummy '%s' has neither "
2762 "ASYNCHRONOUS nor VOLATILE", &a->expr->where,
2767 /* Fortran 2008, 12.5.2.4 (no constraint). */
2768 if (a->expr->expr_type == EXPR_VARIABLE
2769 && f->sym->attr.intent != INTENT_IN && !f->sym->attr.value
2770 && gfc_is_coindexed (a->expr)
2771 && gfc_has_ultimate_allocatable (a->expr))
2774 gfc_error ("Coindexed actual argument at %L with allocatable "
2775 "ultimate component to dummy '%s' requires either VALUE "
2776 "or INTENT(IN)", &a->expr->where, f->sym->name);
2780 if (f->sym->ts.type == BT_CLASS
2781 && CLASS_DATA (f->sym)->attr.allocatable
2782 && gfc_is_class_array_ref (a->expr, &full_array)
2786 gfc_error ("Actual CLASS array argument for '%s' must be a full "
2787 "array at %L", f->sym->name, &a->expr->where);
2792 if (a->expr->expr_type != EXPR_NULL
2793 && compare_allocatable (f->sym, a->expr) == 0)
2796 gfc_error ("Actual argument for '%s' must be ALLOCATABLE at %L",
2797 f->sym->name, &a->expr->where);
2801 /* Check intent = OUT/INOUT for definable actual argument. */
2802 if ((f->sym->attr.intent == INTENT_OUT
2803 || f->sym->attr.intent == INTENT_INOUT))
2805 const char* context = (where
2806 ? _("actual argument to INTENT = OUT/INOUT")
2809 if (((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
2810 && CLASS_DATA (f->sym)->attr.class_pointer)
2811 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
2812 && !gfc_check_vardef_context (a->expr, true, false, false, context))
2814 if (!gfc_check_vardef_context (a->expr, false, false, false, context))
2818 if ((f->sym->attr.intent == INTENT_OUT
2819 || f->sym->attr.intent == INTENT_INOUT
2820 || f->sym->attr.volatile_
2821 || f->sym->attr.asynchronous)
2822 && gfc_has_vector_subscript (a->expr))
2825 gfc_error ("Array-section actual argument with vector "
2826 "subscripts at %L is incompatible with INTENT(OUT), "
2827 "INTENT(INOUT), VOLATILE or ASYNCHRONOUS attribute "
2828 "of the dummy argument '%s'",
2829 &a->expr->where, f->sym->name);
2833 /* C1232 (R1221) For an actual argument which is an array section or
2834 an assumed-shape array, the dummy argument shall be an assumed-
2835 shape array, if the dummy argument has the VOLATILE attribute. */
2837 if (f->sym->attr.volatile_
2838 && a->expr->symtree->n.sym->as
2839 && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SHAPE
2840 && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2843 gfc_error ("Assumed-shape actual argument at %L is "
2844 "incompatible with the non-assumed-shape "
2845 "dummy argument '%s' due to VOLATILE attribute",
2846 &a->expr->where,f->sym->name);
2850 if (f->sym->attr.volatile_
2851 && a->expr->ref && a->expr->ref->u.ar.type == AR_SECTION
2852 && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2855 gfc_error ("Array-section actual argument at %L is "
2856 "incompatible with the non-assumed-shape "
2857 "dummy argument '%s' due to VOLATILE attribute",
2858 &a->expr->where,f->sym->name);
2862 /* C1233 (R1221) For an actual argument which is a pointer array, the
2863 dummy argument shall be an assumed-shape or pointer array, if the
2864 dummy argument has the VOLATILE attribute. */
2866 if (f->sym->attr.volatile_
2867 && a->expr->symtree->n.sym->attr.pointer
2868 && a->expr->symtree->n.sym->as
2870 && (f->sym->as->type == AS_ASSUMED_SHAPE
2871 || f->sym->attr.pointer)))
2874 gfc_error ("Pointer-array actual argument at %L requires "
2875 "an assumed-shape or pointer-array dummy "
2876 "argument '%s' due to VOLATILE attribute",
2877 &a->expr->where,f->sym->name);
2888 /* Make sure missing actual arguments are optional. */
2890 for (f = formal; f; f = f->next, i++)
2892 if (new_arg[i] != NULL)
2897 gfc_error ("Missing alternate return spec in subroutine call "
2901 if (!f->sym->attr.optional)
2904 gfc_error ("Missing actual argument for argument '%s' at %L",
2905 f->sym->name, where);
2910 /* The argument lists are compatible. We now relink a new actual
2911 argument list with null arguments in the right places. The head
2912 of the list remains the head. */
2913 for (i = 0; i < n; i++)
2914 if (new_arg[i] == NULL)
2915 new_arg[i] = gfc_get_actual_arglist ();
2920 *new_arg[0] = *actual;
2924 new_arg[0] = new_arg[na];
2928 for (i = 0; i < n - 1; i++)
2929 new_arg[i]->next = new_arg[i + 1];
2931 new_arg[i]->next = NULL;
2933 if (*ap == NULL && n > 0)
2936 /* Note the types of omitted optional arguments. */
2937 for (a = *ap, f = formal; a; a = a->next, f = f->next)
2938 if (a->expr == NULL && a->label == NULL)
2939 a->missing_arg_type = f->sym->ts.type;
2947 gfc_formal_arglist *f;
2948 gfc_actual_arglist *a;
2952 /* qsort comparison function for argument pairs, with the following
2954 - p->a->expr == NULL
2955 - p->a->expr->expr_type != EXPR_VARIABLE
2956 - growing p->a->expr->symbol. */
2959 pair_cmp (const void *p1, const void *p2)
2961 const gfc_actual_arglist *a1, *a2;
2963 /* *p1 and *p2 are elements of the to-be-sorted array. */
2964 a1 = ((const argpair *) p1)->a;
2965 a2 = ((const argpair *) p2)->a;
2974 if (a1->expr->expr_type != EXPR_VARIABLE)
2976 if (a2->expr->expr_type != EXPR_VARIABLE)
2980 if (a2->expr->expr_type != EXPR_VARIABLE)
2982 return a1->expr->symtree->n.sym < a2->expr->symtree->n.sym;
2986 /* Given two expressions from some actual arguments, test whether they
2987 refer to the same expression. The analysis is conservative.
2988 Returning false will produce no warning. */
2991 compare_actual_expr (gfc_expr *e1, gfc_expr *e2)
2993 const gfc_ref *r1, *r2;
2996 || e1->expr_type != EXPR_VARIABLE
2997 || e2->expr_type != EXPR_VARIABLE
2998 || e1->symtree->n.sym != e2->symtree->n.sym)
3001 /* TODO: improve comparison, see expr.c:show_ref(). */
3002 for (r1 = e1->ref, r2 = e2->ref; r1 && r2; r1 = r1->next, r2 = r2->next)
3004 if (r1->type != r2->type)
3009 if (r1->u.ar.type != r2->u.ar.type)
3011 /* TODO: At the moment, consider only full arrays;
3012 we could do better. */
3013 if (r1->u.ar.type != AR_FULL || r2->u.ar.type != AR_FULL)
3018 if (r1->u.c.component != r2->u.c.component)
3026 gfc_internal_error ("compare_actual_expr(): Bad component code");
3035 /* Given formal and actual argument lists that correspond to one
3036 another, check that identical actual arguments aren't not
3037 associated with some incompatible INTENTs. */
3040 check_some_aliasing (gfc_formal_arglist *f, gfc_actual_arglist *a)
3042 sym_intent f1_intent, f2_intent;
3043 gfc_formal_arglist *f1;
3044 gfc_actual_arglist *a1;
3050 for (f1 = f, a1 = a;; f1 = f1->next, a1 = a1->next)
3052 if (f1 == NULL && a1 == NULL)
3054 if (f1 == NULL || a1 == NULL)
3055 gfc_internal_error ("check_some_aliasing(): List mismatch");
3060 p = XALLOCAVEC (argpair, n);
3062 for (i = 0, f1 = f, a1 = a; i < n; i++, f1 = f1->next, a1 = a1->next)
3068 qsort (p, n, sizeof (argpair), pair_cmp);
3070 for (i = 0; i < n; i++)
3073 || p[i].a->expr->expr_type != EXPR_VARIABLE
3074 || p[i].a->expr->ts.type == BT_PROCEDURE)
3076 f1_intent = p[i].f->sym->attr.intent;
3077 for (j = i + 1; j < n; j++)
3079 /* Expected order after the sort. */
3080 if (!p[j].a->expr || p[j].a->expr->expr_type != EXPR_VARIABLE)
3081 gfc_internal_error ("check_some_aliasing(): corrupted data");
3083 /* Are the expression the same? */
3084 if (!compare_actual_expr (p[i].a->expr, p[j].a->expr))
3086 f2_intent = p[j].f->sym->attr.intent;
3087 if ((f1_intent == INTENT_IN && f2_intent == INTENT_OUT)
3088 || (f1_intent == INTENT_OUT && f2_intent == INTENT_IN)
3089 || (f1_intent == INTENT_OUT && f2_intent == INTENT_OUT))
3091 gfc_warning ("Same actual argument associated with INTENT(%s) "
3092 "argument '%s' and INTENT(%s) argument '%s' at %L",
3093 gfc_intent_string (f1_intent), p[i].f->sym->name,
3094 gfc_intent_string (f2_intent), p[j].f->sym->name,
3095 &p[i].a->expr->where);
3105 /* Given formal and actual argument lists that correspond to one
3106 another, check that they are compatible in the sense that intents
3107 are not mismatched. */
3110 check_intents (gfc_formal_arglist *f, gfc_actual_arglist *a)
3112 sym_intent f_intent;
3114 for (;; f = f->next, a = a->next)
3116 if (f == NULL && a == NULL)
3118 if (f == NULL || a == NULL)
3119 gfc_internal_error ("check_intents(): List mismatch");
3121 if (a->expr == NULL || a->expr->expr_type != EXPR_VARIABLE)
3124 f_intent = f->sym->attr.intent;
3126 if (gfc_pure (NULL) && gfc_impure_variable (a->expr->symtree->n.sym))
3128 if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
3129 && CLASS_DATA (f->sym)->attr.class_pointer)
3130 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
3132 gfc_error ("Procedure argument at %L is local to a PURE "
3133 "procedure and has the POINTER attribute",
3139 /* Fortran 2008, C1283. */
3140 if (gfc_pure (NULL) && gfc_is_coindexed (a->expr))
3142 if (f_intent == INTENT_INOUT || f_intent == INTENT_OUT)
3144 gfc_error ("Coindexed actual argument at %L in PURE procedure "
3145 "is passed to an INTENT(%s) argument",
3146 &a->expr->where, gfc_intent_string (f_intent));
3150 if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
3151 && CLASS_DATA (f->sym)->attr.class_pointer)
3152 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
3154 gfc_error ("Coindexed actual argument at %L in PURE procedure "
3155 "is passed to a POINTER dummy argument",
3161 /* F2008, Section 12.5.2.4. */
3162 if (a->expr->ts.type == BT_CLASS && f->sym->ts.type == BT_CLASS
3163 && gfc_is_coindexed (a->expr))
3165 gfc_error ("Coindexed polymorphic actual argument at %L is passed "
3166 "polymorphic dummy argument '%s'",
3167 &a->expr->where, f->sym->name);
3176 /* Check how a procedure is used against its interface. If all goes
3177 well, the actual argument list will also end up being properly
3181 gfc_procedure_use (gfc_symbol *sym, gfc_actual_arglist **ap, locus *where)
3183 gfc_formal_arglist *dummy_args;
3185 /* Warn about calls with an implicit interface. Special case
3186 for calling a ISO_C_BINDING because c_loc and c_funloc
3187 are pseudo-unknown. Additionally, warn about procedures not
3188 explicitly declared at all if requested. */
3189 if (sym->attr.if_source == IFSRC_UNKNOWN && ! sym->attr.is_iso_c)
3191 if (gfc_option.warn_implicit_interface)
3192 gfc_warning ("Procedure '%s' called with an implicit interface at %L",
3194 else if (gfc_option.warn_implicit_procedure
3195 && sym->attr.proc == PROC_UNKNOWN)
3196 gfc_warning ("Procedure '%s' called at %L is not explicitly declared",
3200 if (sym->attr.if_source == IFSRC_UNKNOWN)
3202 gfc_actual_arglist *a;
3204 if (sym->attr.pointer)
3206 gfc_error("The pointer object '%s' at %L must have an explicit "
3207 "function interface or be declared as array",
3212 if (sym->attr.allocatable && !sym->attr.external)
3214 gfc_error("The allocatable object '%s' at %L must have an explicit "
3215 "function interface or be declared as array",
3220 if (sym->attr.allocatable)
3222 gfc_error("Allocatable function '%s' at %L must have an explicit "
3223 "function interface", sym->name, where);
3227 for (a = *ap; a; a = a->next)
3229 /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */
3230 if (a->name != NULL && a->name[0] != '%')
3232 gfc_error("Keyword argument requires explicit interface "
3233 "for procedure '%s' at %L", sym->name, &a->expr->where);
3237 /* TS 29113, 6.2. */
3238 if (a->expr && a->expr->ts.type == BT_ASSUMED
3239 && sym->intmod_sym_id != ISOCBINDING_LOC)
3241 gfc_error ("Assumed-type argument %s at %L requires an explicit "
3242 "interface", a->expr->symtree->n.sym->name,
3247 /* F2008, C1303 and C1304. */
3249 && (a->expr->ts.type == BT_DERIVED || a->expr->ts.type == BT_CLASS)
3250 && ((a->expr->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
3251 && a->expr->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
3252 || gfc_expr_attr (a->expr).lock_comp))
3254 gfc_error("Actual argument of LOCK_TYPE or with LOCK_TYPE "
3255 "component at %L requires an explicit interface for "
3256 "procedure '%s'", &a->expr->where, sym->name);
3260 if (a->expr && a->expr->expr_type == EXPR_NULL
3261 && a->expr->ts.type == BT_UNKNOWN)
3263 gfc_error ("MOLD argument to NULL required at %L", &a->expr->where);
3267 /* TS 29113, C407b. */
3268 if (a->expr && a->expr->expr_type == EXPR_VARIABLE
3269 && symbol_rank (a->expr->symtree->n.sym) == -1)
3271 gfc_error ("Assumed-rank argument requires an explicit interface "
3272 "at %L", &a->expr->where);
3280 dummy_args = gfc_sym_get_dummy_args (sym);
3282 if (!compare_actual_formal (ap, dummy_args, 0, sym->attr.elemental, where))
3285 if (!check_intents (dummy_args, *ap))
3288 if (gfc_option.warn_aliasing)
3289 check_some_aliasing (dummy_args, *ap);
3295 /* Check how a procedure pointer component is used against its interface.
3296 If all goes well, the actual argument list will also end up being properly
3297 sorted. Completely analogous to gfc_procedure_use. */
3300 gfc_ppc_use (gfc_component *comp, gfc_actual_arglist **ap, locus *where)
3302 /* Warn about calls with an implicit interface. Special case
3303 for calling a ISO_C_BINDING because c_loc and c_funloc
3304 are pseudo-unknown. */
3305 if (gfc_option.warn_implicit_interface
3306 && comp->attr.if_source == IFSRC_UNKNOWN
3307 && !comp->attr.is_iso_c)
3308 gfc_warning ("Procedure pointer component '%s' called with an implicit "
3309 "interface at %L", comp->name, where);
3311 if (comp->attr.if_source == IFSRC_UNKNOWN)
3313 gfc_actual_arglist *a;
3314 for (a = *ap; a; a = a->next)
3316 /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */
3317 if (a->name != NULL && a->name[0] != '%')
3319 gfc_error("Keyword argument requires explicit interface "
3320 "for procedure pointer component '%s' at %L",
3321 comp->name, &a->expr->where);
3329 if (!compare_actual_formal (ap, comp->ts.interface->formal, 0,
3330 comp->attr.elemental, where))
3333 check_intents (comp->ts.interface->formal, *ap);
3334 if (gfc_option.warn_aliasing)
3335 check_some_aliasing (comp->ts.interface->formal, *ap);
3339 /* Try if an actual argument list matches the formal list of a symbol,
3340 respecting the symbol's attributes like ELEMENTAL. This is used for
3341 GENERIC resolution. */
3344 gfc_arglist_matches_symbol (gfc_actual_arglist** args, gfc_symbol* sym)
3346 gfc_formal_arglist *dummy_args;
3349 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
3351 dummy_args = gfc_sym_get_dummy_args (sym);
3353 r = !sym->attr.elemental;
3354 if (compare_actual_formal (args, dummy_args, r, !r, NULL))
3356 check_intents (dummy_args, *args);
3357 if (gfc_option.warn_aliasing)
3358 check_some_aliasing (dummy_args, *args);
3366 /* Given an interface pointer and an actual argument list, search for
3367 a formal argument list that matches the actual. If found, returns
3368 a pointer to the symbol of the correct interface. Returns NULL if
3372 gfc_search_interface (gfc_interface *intr, int sub_flag,
3373 gfc_actual_arglist **ap)
3375 gfc_symbol *elem_sym = NULL;
3376 gfc_symbol *null_sym = NULL;
3377 locus null_expr_loc;
3378 gfc_actual_arglist *a;
3379 bool has_null_arg = false;
3381 for (a = *ap; a; a = a->next)
3382 if (a->expr && a->expr->expr_type == EXPR_NULL
3383 && a->expr->ts.type == BT_UNKNOWN)
3385 has_null_arg = true;
3386 null_expr_loc = a->expr->where;
3390 for (; intr; intr = intr->next)
3392 if (intr->sym->attr.flavor == FL_DERIVED)
3394 if (sub_flag && intr->sym->attr.function)
3396 if (!sub_flag && intr->sym->attr.subroutine)
3399 if (gfc_arglist_matches_symbol (ap, intr->sym))
3401 if (has_null_arg && null_sym)
3403 gfc_error ("MOLD= required in NULL() argument at %L: Ambiguity "
3404 "between specific functions %s and %s",
3405 &null_expr_loc, null_sym->name, intr->sym->name);
3408 else if (has_null_arg)
3410 null_sym = intr->sym;
3414 /* Satisfy 12.4.4.1 such that an elemental match has lower
3415 weight than a non-elemental match. */
3416 if (intr->sym->attr.elemental)
3418 elem_sym = intr->sym;
3428 return elem_sym ? elem_sym : NULL;
3432 /* Do a brute force recursive search for a symbol. */
3434 static gfc_symtree *
3435 find_symtree0 (gfc_symtree *root, gfc_symbol *sym)
3439 if (root->n.sym == sym)
3444 st = find_symtree0 (root->left, sym);
3445 if (root->right && ! st)
3446 st = find_symtree0 (root->right, sym);
3451 /* Find a symtree for a symbol. */
3454 gfc_find_sym_in_symtree (gfc_symbol *sym)
3459 /* First try to find it by name. */
3460 gfc_find_sym_tree (sym->name, gfc_current_ns, 1, &st);
3461 if (st && st->n.sym == sym)
3464 /* If it's been renamed, resort to a brute-force search. */
3465 /* TODO: avoid having to do this search. If the symbol doesn't exist
3466 in the symtree for the current namespace, it should probably be added. */
3467 for (ns = gfc_current_ns; ns; ns = ns->parent)
3469 st = find_symtree0 (ns->sym_root, sym);
3473 gfc_internal_error ("Unable to find symbol %s", sym->name);
3478 /* See if the arglist to an operator-call contains a derived-type argument
3479 with a matching type-bound operator. If so, return the matching specific
3480 procedure defined as operator-target as well as the base-object to use
3481 (which is the found derived-type argument with operator). The generic
3482 name, if any, is transmitted to the final expression via 'gname'. */
3484 static gfc_typebound_proc*
3485 matching_typebound_op (gfc_expr** tb_base,
3486 gfc_actual_arglist* args,
3487 gfc_intrinsic_op op, const char* uop,
3488 const char ** gname)
3490 gfc_actual_arglist* base;
3492 for (base = args; base; base = base->next)
3493 if (base->expr->ts.type == BT_DERIVED || base->expr->ts.type == BT_CLASS)
3495 gfc_typebound_proc* tb;
3496 gfc_symbol* derived;
3499 while (base->expr->expr_type == EXPR_OP
3500 && base->expr->value.op.op == INTRINSIC_PARENTHESES)
3501 base->expr = base->expr->value.op.op1;
3503 if (base->expr->ts.type == BT_CLASS)
3505 if (CLASS_DATA (base->expr) == NULL
3506 || !gfc_expr_attr (base->expr).class_ok)
3508 derived = CLASS_DATA (base->expr)->ts.u.derived;
3511 derived = base->expr->ts.u.derived;
3513 if (op == INTRINSIC_USER)
3515 gfc_symtree* tb_uop;
3518 tb_uop = gfc_find_typebound_user_op (derived, &result, uop,
3527 tb = gfc_find_typebound_intrinsic_op (derived, &result, op,
3530 /* This means we hit a PRIVATE operator which is use-associated and
3531 should thus not be seen. */
3535 /* Look through the super-type hierarchy for a matching specific
3537 for (; tb; tb = tb->overridden)
3541 gcc_assert (tb->is_generic);
3542 for (g = tb->u.generic; g; g = g->next)
3545 gfc_actual_arglist* argcopy;
3548 gcc_assert (g->specific);
3549 if (g->specific->error)
3552 target = g->specific->u.specific->n.sym;
3554 /* Check if this arglist matches the formal. */
3555 argcopy = gfc_copy_actual_arglist (args);
3556 matches = gfc_arglist_matches_symbol (&argcopy, target);
3557 gfc_free_actual_arglist (argcopy);
3559 /* Return if we found a match. */
3562 *tb_base = base->expr;
3563 *gname = g->specific_st->name;
3574 /* For the 'actual arglist' of an operator call and a specific typebound
3575 procedure that has been found the target of a type-bound operator, build the
3576 appropriate EXPR_COMPCALL and resolve it. We take this indirection over
3577 type-bound procedures rather than resolving type-bound operators 'directly'
3578 so that we can reuse the existing logic. */
3581 build_compcall_for_operator (gfc_expr* e, gfc_actual_arglist* actual,
3582 gfc_expr* base, gfc_typebound_proc* target,
3585 e->expr_type = EXPR_COMPCALL;
3586 e->value.compcall.tbp = target;
3587 e->value.compcall.name = gname ? gname : "$op";
3588 e->value.compcall.actual = actual;
3589 e->value.compcall.base_object = base;
3590 e->value.compcall.ignore_pass = 1;
3591 e->value.compcall.assign = 0;
3592 if (e->ts.type == BT_UNKNOWN
3593 && target->function)
3595 if (target->is_generic)
3596 e->ts = target->u.generic->specific->u.specific->n.sym->ts;
3598 e->ts = target->u.specific->n.sym->ts;
3603 /* This subroutine is called when an expression is being resolved.
3604 The expression node in question is either a user defined operator
3605 or an intrinsic operator with arguments that aren't compatible
3606 with the operator. This subroutine builds an actual argument list
3607 corresponding to the operands, then searches for a compatible
3608 interface. If one is found, the expression node is replaced with
3609 the appropriate function call. We use the 'match' enum to specify
3610 whether a replacement has been made or not, or if an error occurred. */
3613 gfc_extend_expr (gfc_expr *e)
3615 gfc_actual_arglist *actual;
3624 actual = gfc_get_actual_arglist ();
3625 actual->expr = e->value.op.op1;
3629 if (e->value.op.op2 != NULL)
3631 actual->next = gfc_get_actual_arglist ();
3632 actual->next->expr = e->value.op.op2;
3635 i = fold_unary_intrinsic (e->value.op.op);
3637 if (i == INTRINSIC_USER)
3639 for (ns = gfc_current_ns; ns; ns = ns->parent)
3641 uop = gfc_find_uop (e->value.op.uop->name, ns);
3645 sym = gfc_search_interface (uop->op, 0, &actual);
3652 for (ns = gfc_current_ns; ns; ns = ns->parent)
3654 /* Due to the distinction between '==' and '.eq.' and friends, one has
3655 to check if either is defined. */
3658 #define CHECK_OS_COMPARISON(comp) \
3659 case INTRINSIC_##comp: \
3660 case INTRINSIC_##comp##_OS: \
3661 sym = gfc_search_interface (ns->op[INTRINSIC_##comp], 0, &actual); \
3663 sym = gfc_search_interface (ns->op[INTRINSIC_##comp##_OS], 0, &actual); \
3665 CHECK_OS_COMPARISON(EQ)
3666 CHECK_OS_COMPARISON(NE)
3667 CHECK_OS_COMPARISON(GT)
3668 CHECK_OS_COMPARISON(GE)
3669 CHECK_OS_COMPARISON(LT)
3670 CHECK_OS_COMPARISON(LE)
3671 #undef CHECK_OS_COMPARISON
3674 sym = gfc_search_interface (ns->op[i], 0, &actual);
3682 /* TODO: Do an ambiguity-check and error if multiple matching interfaces are
3683 found rather than just taking the first one and not checking further. */
3687 gfc_typebound_proc* tbo;
3690 /* See if we find a matching type-bound operator. */
3691 if (i == INTRINSIC_USER)
3692 tbo = matching_typebound_op (&tb_base, actual,
3693 i, e->value.op.uop->name, &gname);
3697 #define CHECK_OS_COMPARISON(comp) \
3698 case INTRINSIC_##comp: \
3699 case INTRINSIC_##comp##_OS: \
3700 tbo = matching_typebound_op (&tb_base, actual, \
3701 INTRINSIC_##comp, NULL, &gname); \
3703 tbo = matching_typebound_op (&tb_base, actual, \
3704 INTRINSIC_##comp##_OS, NULL, &gname); \
3706 CHECK_OS_COMPARISON(EQ)
3707 CHECK_OS_COMPARISON(NE)
3708 CHECK_OS_COMPARISON(GT)
3709 CHECK_OS_COMPARISON(GE)
3710 CHECK_OS_COMPARISON(LT)
3711 CHECK_OS_COMPARISON(LE)
3712 #undef CHECK_OS_COMPARISON
3715 tbo = matching_typebound_op (&tb_base, actual, i, NULL, &gname);
3719 /* If there is a matching typebound-operator, replace the expression with
3720 a call to it and succeed. */
3725 gcc_assert (tb_base);
3726 build_compcall_for_operator (e, actual, tb_base, tbo, gname);
3728 result = gfc_resolve_expr (e);
3735 /* Don't use gfc_free_actual_arglist(). */
3736 free (actual->next);
3742 /* Change the expression node to a function call. */
3743 e->expr_type = EXPR_FUNCTION;
3744 e->symtree = gfc_find_sym_in_symtree (sym);
3745 e->value.function.actual = actual;
3746 e->value.function.esym = NULL;
3747 e->value.function.isym = NULL;
3748 e->value.function.name = NULL;
3749 e->user_operator = 1;
3751 if (!gfc_resolve_expr (e))
3758 /* Tries to replace an assignment code node with a subroutine call to the
3759 subroutine associated with the assignment operator. Return true if the node
3760 was replaced. On false, no error is generated. */
3763 gfc_extend_assign (gfc_code *c, gfc_namespace *ns)
3765 gfc_actual_arglist *actual;
3766 gfc_expr *lhs, *rhs, *tb_base;
3767 gfc_symbol *sym = NULL;
3768 const char *gname = NULL;
3769 gfc_typebound_proc* tbo;
3774 /* Don't allow an intrinsic assignment to be replaced. */
3775 if (lhs->ts.type != BT_DERIVED && lhs->ts.type != BT_CLASS
3776 && (rhs->rank == 0 || rhs->rank == lhs->rank)
3777 && (lhs->ts.type == rhs->ts.type
3778 || (gfc_numeric_ts (&lhs->ts) && gfc_numeric_ts (&rhs->ts))))
3781 actual = gfc_get_actual_arglist ();
3784 actual->next = gfc_get_actual_arglist ();
3785 actual->next->expr = rhs;
3787 /* TODO: Ambiguity-check, see above for gfc_extend_expr. */
3789 /* See if we find a matching type-bound assignment. */
3790 tbo = matching_typebound_op (&tb_base, actual, INTRINSIC_ASSIGN,
3795 /* Success: Replace the expression with a type-bound call. */
3796 gcc_assert (tb_base);
3797 c->expr1 = gfc_get_expr ();
3798 build_compcall_for_operator (c->expr1, actual, tb_base, tbo, gname);
3799 c->expr1->value.compcall.assign = 1;
3800 c->expr1->where = c->loc;
3802 c->op = EXEC_COMPCALL;
3806 /* See if we find an 'ordinary' (non-typebound) assignment procedure. */
3807 for (; ns; ns = ns->parent)
3809 sym = gfc_search_interface (ns->op[INTRINSIC_ASSIGN], 1, &actual);
3816 /* Success: Replace the assignment with the call. */
3817 c->op = EXEC_ASSIGN_CALL;
3818 c->symtree = gfc_find_sym_in_symtree (sym);
3821 c->ext.actual = actual;
3825 /* Failure: No assignment procedure found. */
3826 free (actual->next);
3832 /* Make sure that the interface just parsed is not already present in
3833 the given interface list. Ambiguity isn't checked yet since module
3834 procedures can be present without interfaces. */
3837 gfc_check_new_interface (gfc_interface *base, gfc_symbol *new_sym, locus loc)
3841 for (ip = base; ip; ip = ip->next)
3843 if (ip->sym == new_sym)
3845 gfc_error ("Entity '%s' at %L is already present in the interface",
3846 new_sym->name, &loc);
3855 /* Add a symbol to the current interface. */
3858 gfc_add_interface (gfc_symbol *new_sym)
3860 gfc_interface **head, *intr;
3864 switch (current_interface.type)
3866 case INTERFACE_NAMELESS:
3867 case INTERFACE_ABSTRACT:
3870 case INTERFACE_INTRINSIC_OP:
3871 for (ns = current_interface.ns; ns; ns = ns->parent)
3872 switch (current_interface.op)
3875 case INTRINSIC_EQ_OS:
3876 if (!gfc_check_new_interface (ns->op[INTRINSIC_EQ], new_sym,
3878 || !gfc_check_new_interface (ns->op[INTRINSIC_EQ_OS],
3879 new_sym, gfc_current_locus))
3884 case INTRINSIC_NE_OS:
3885 if (!gfc_check_new_interface (ns->op[INTRINSIC_NE], new_sym,
3887 || !gfc_check_new_interface (ns->op[INTRINSIC_NE_OS],
3888 new_sym, gfc_current_locus))
3893 case INTRINSIC_GT_OS:
3894 if (!gfc_check_new_interface (ns->op[INTRINSIC_GT],
3895 new_sym, gfc_current_locus)
3896 || !gfc_check_new_interface (ns->op[INTRINSIC_GT_OS],
3897 new_sym, gfc_current_locus))
3902 case INTRINSIC_GE_OS:
3903 if (!gfc_check_new_interface (ns->op[INTRINSIC_GE],
3904 new_sym, gfc_current_locus)
3905 || !gfc_check_new_interface (ns->op[INTRINSIC_GE_OS],
3906 new_sym, gfc_current_locus))
3911 case INTRINSIC_LT_OS:
3912 if (!gfc_check_new_interface (ns->op[INTRINSIC_LT],
3913 new_sym, gfc_current_locus)
3914 || !gfc_check_new_interface (ns->op[INTRINSIC_LT_OS],
3915 new_sym, gfc_current_locus))
3920 case INTRINSIC_LE_OS:
3921 if (!gfc_check_new_interface (ns->op[INTRINSIC_LE],
3922 new_sym, gfc_current_locus)
3923 || !gfc_check_new_interface (ns->op[INTRINSIC_LE_OS],
3924 new_sym, gfc_current_locus))
3929 if (!gfc_check_new_interface (ns->op[current_interface.op],
3930 new_sym, gfc_current_locus))
3934 head = ¤t_interface.ns->op[current_interface.op];
3937 case INTERFACE_GENERIC:
3938 for (ns = current_interface.ns; ns; ns = ns->parent)
3940 gfc_find_symbol (current_interface.sym->name, ns, 0, &sym);
3944 if (!gfc_check_new_interface (sym->generic,
3945 new_sym, gfc_current_locus))
3949 head = ¤t_interface.sym->generic;
3952 case INTERFACE_USER_OP:
3953 if (!gfc_check_new_interface (current_interface.uop->op,
3954 new_sym, gfc_current_locus))
3957 head = ¤t_interface.uop->op;
3961 gfc_internal_error ("gfc_add_interface(): Bad interface type");
3964 intr = gfc_get_interface ();
3965 intr->sym = new_sym;
3966 intr->where = gfc_current_locus;
3976 gfc_current_interface_head (void)
3978 switch (current_interface.type)
3980 case INTERFACE_INTRINSIC_OP:
3981 return current_interface.ns->op[current_interface.op];
3984 case INTERFACE_GENERIC:
3985 return current_interface.sym->generic;
3988 case INTERFACE_USER_OP:
3989 return current_interface.uop->op;
3999 gfc_set_current_interface_head (gfc_interface *i)
4001 switch (current_interface.type)
4003 case INTERFACE_INTRINSIC_OP:
4004 current_interface.ns->op[current_interface.op] = i;
4007 case INTERFACE_GENERIC:
4008 current_interface.sym->generic = i;
4011 case INTERFACE_USER_OP:
4012 current_interface.uop->op = i;
4021 /* Gets rid of a formal argument list. We do not free symbols.
4022 Symbols are freed when a namespace is freed. */
4025 gfc_free_formal_arglist (gfc_formal_arglist *p)
4027 gfc_formal_arglist *q;
4037 /* Check that it is ok for the type-bound procedure 'proc' to override the
4038 procedure 'old', cf. F08:4.5.7.3. */
4041 gfc_check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
4044 gfc_symbol *proc_target, *old_target;
4045 unsigned proc_pass_arg, old_pass_arg, argpos;
4046 gfc_formal_arglist *proc_formal, *old_formal;
4050 /* This procedure should only be called for non-GENERIC proc. */
4051 gcc_assert (!proc->n.tb->is_generic);
4053 /* If the overwritten procedure is GENERIC, this is an error. */
4054 if (old->n.tb->is_generic)
4056 gfc_error ("Can't overwrite GENERIC '%s' at %L",
4057 old->name, &proc->n.tb->where);
4061 where = proc->n.tb->where;
4062 proc_target = proc->n.tb->u.specific->n.sym;
4063 old_target = old->n.tb->u.specific->n.sym;
4065 /* Check that overridden binding is not NON_OVERRIDABLE. */
4066 if (old->n.tb->non_overridable)
4068 gfc_error ("'%s' at %L overrides a procedure binding declared"
4069 " NON_OVERRIDABLE", proc->name, &where);
4073 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
4074 if (!old->n.tb->deferred && proc->n.tb->deferred)
4076 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
4077 " non-DEFERRED binding", proc->name, &where);
4081 /* If the overridden binding is PURE, the overriding must be, too. */
4082 if (old_target->attr.pure && !proc_target->attr.pure)
4084 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
4085 proc->name, &where);
4089 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
4090 is not, the overriding must not be either. */
4091 if (old_target->attr.elemental && !proc_target->attr.elemental)
4093 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
4094 " ELEMENTAL", proc->name, &where);
4097 if (!old_target->attr.elemental && proc_target->attr.elemental)
4099 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
4100 " be ELEMENTAL, either", proc->name, &where);
4104 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
4106 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
4108 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
4109 " SUBROUTINE", proc->name, &where);
4113 /* If the overridden binding is a FUNCTION, the overriding must also be a
4114 FUNCTION and have the same characteristics. */
4115 if (old_target->attr.function)
4117 if (!proc_target->attr.function)
4119 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
4120 " FUNCTION", proc->name, &where);
4124 if (!check_result_characteristics (proc_target, old_target, err,
4127 gfc_error ("Result mismatch for the overriding procedure "
4128 "'%s' at %L: %s", proc->name, &where, err);
4133 /* If the overridden binding is PUBLIC, the overriding one must not be
4135 if (old->n.tb->access == ACCESS_PUBLIC
4136 && proc->n.tb->access == ACCESS_PRIVATE)
4138 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
4139 " PRIVATE", proc->name, &where);
4143 /* Compare the formal argument lists of both procedures. This is also abused
4144 to find the position of the passed-object dummy arguments of both
4145 bindings as at least the overridden one might not yet be resolved and we
4146 need those positions in the check below. */
4147 proc_pass_arg = old_pass_arg = 0;
4148 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
4150 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
4153 proc_formal = gfc_sym_get_dummy_args (proc_target);
4154 old_formal = gfc_sym_get_dummy_args (old_target);
4155 for ( ; proc_formal && old_formal;
4156 proc_formal = proc_formal->next, old_formal = old_formal->next)
4158 if (proc->n.tb->pass_arg
4159 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
4160 proc_pass_arg = argpos;
4161 if (old->n.tb->pass_arg
4162 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
4163 old_pass_arg = argpos;
4165 /* Check that the names correspond. */
4166 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
4168 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
4169 " to match the corresponding argument of the overridden"
4170 " procedure", proc_formal->sym->name, proc->name, &where,
4171 old_formal->sym->name);
4175 check_type = proc_pass_arg != argpos && old_pass_arg != argpos;
4176 if (!check_dummy_characteristics (proc_formal->sym, old_formal->sym,
4177 check_type, err, sizeof(err)))
4179 gfc_error ("Argument mismatch for the overriding procedure "
4180 "'%s' at %L: %s", proc->name, &where, err);
4186 if (proc_formal || old_formal)
4188 gfc_error ("'%s' at %L must have the same number of formal arguments as"
4189 " the overridden procedure", proc->name, &where);
4193 /* If the overridden binding is NOPASS, the overriding one must also be
4195 if (old->n.tb->nopass && !proc->n.tb->nopass)
4197 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
4198 " NOPASS", proc->name, &where);
4202 /* If the overridden binding is PASS(x), the overriding one must also be
4203 PASS and the passed-object dummy arguments must correspond. */
4204 if (!old->n.tb->nopass)
4206 if (proc->n.tb->nopass)
4208 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
4209 " PASS", proc->name, &where);
4213 if (proc_pass_arg != old_pass_arg)
4215 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
4216 " the same position as the passed-object dummy argument of"
4217 " the overridden procedure", proc->name, &where);