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) == FAILURE)
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")
258 m = gfc_match_eos ();
262 gfc_error ("Syntax error in ABSTRACT INTERFACE statement at %C");
266 current_interface.type = INTERFACE_ABSTRACT;
272 /* Match the different sort of generic-specs that can be present after
273 the END INTERFACE itself. */
276 gfc_match_end_interface (void)
278 char name[GFC_MAX_SYMBOL_LEN + 1];
283 m = gfc_match_space ();
285 if (gfc_match_generic_spec (&type, name, &op) == MATCH_ERROR)
288 /* If we're not looking at the end of the statement now, or if this
289 is not a nameless interface but we did not see a space, punt. */
290 if (gfc_match_eos () != MATCH_YES
291 || (type != INTERFACE_NAMELESS && m != MATCH_YES))
293 gfc_error ("Syntax error: Trailing garbage in END INTERFACE "
300 switch (current_interface.type)
302 case INTERFACE_NAMELESS:
303 case INTERFACE_ABSTRACT:
304 if (type != INTERFACE_NAMELESS)
306 gfc_error ("Expected a nameless interface at %C");
312 case INTERFACE_INTRINSIC_OP:
313 if (type != current_interface.type || op != current_interface.op)
316 if (current_interface.op == INTRINSIC_ASSIGN)
319 gfc_error ("Expected 'END INTERFACE ASSIGNMENT (=)' at %C");
324 s1 = gfc_op2string (current_interface.op);
325 s2 = gfc_op2string (op);
327 /* The following if-statements are used to enforce C1202
329 if ((strcmp(s1, "==") == 0 && strcmp(s2, ".eq.") == 0)
330 || (strcmp(s1, ".eq.") == 0 && strcmp(s2, "==") == 0))
332 if ((strcmp(s1, "/=") == 0 && strcmp(s2, ".ne.") == 0)
333 || (strcmp(s1, ".ne.") == 0 && strcmp(s2, "/=") == 0))
335 if ((strcmp(s1, "<=") == 0 && strcmp(s2, ".le.") == 0)
336 || (strcmp(s1, ".le.") == 0 && strcmp(s2, "<=") == 0))
338 if ((strcmp(s1, "<") == 0 && strcmp(s2, ".lt.") == 0)
339 || (strcmp(s1, ".lt.") == 0 && strcmp(s2, "<") == 0))
341 if ((strcmp(s1, ">=") == 0 && strcmp(s2, ".ge.") == 0)
342 || (strcmp(s1, ".ge.") == 0 && strcmp(s2, ">=") == 0))
344 if ((strcmp(s1, ">") == 0 && strcmp(s2, ".gt.") == 0)
345 || (strcmp(s1, ".gt.") == 0 && strcmp(s2, ">") == 0))
349 gfc_error ("Expecting 'END INTERFACE OPERATOR (%s)' at %C, "
350 "but got %s", s1, s2);
357 case INTERFACE_USER_OP:
358 /* Comparing the symbol node names is OK because only use-associated
359 symbols can be renamed. */
360 if (type != current_interface.type
361 || strcmp (current_interface.uop->name, name) != 0)
363 gfc_error ("Expecting 'END INTERFACE OPERATOR (.%s.)' at %C",
364 current_interface.uop->name);
370 case INTERFACE_GENERIC:
371 if (type != current_interface.type
372 || strcmp (current_interface.sym->name, name) != 0)
374 gfc_error ("Expecting 'END INTERFACE %s' at %C",
375 current_interface.sym->name);
386 /* Compare two derived types using the criteria in 4.4.2 of the standard,
387 recursing through gfc_compare_types for the components. */
390 gfc_compare_derived_types (gfc_symbol *derived1, gfc_symbol *derived2)
392 gfc_component *dt1, *dt2;
394 if (derived1 == derived2)
397 gcc_assert (derived1 && derived2);
399 /* Special case for comparing derived types across namespaces. If the
400 true names and module names are the same and the module name is
401 nonnull, then they are equal. */
402 if (strcmp (derived1->name, derived2->name) == 0
403 && derived1->module != NULL && derived2->module != NULL
404 && strcmp (derived1->module, derived2->module) == 0)
407 /* Compare type via the rules of the standard. Both types must have
408 the SEQUENCE or BIND(C) attribute to be equal. */
410 if (strcmp (derived1->name, derived2->name))
413 if (derived1->component_access == ACCESS_PRIVATE
414 || derived2->component_access == ACCESS_PRIVATE)
417 if (!(derived1->attr.sequence && derived2->attr.sequence)
418 && !(derived1->attr.is_bind_c && derived2->attr.is_bind_c))
421 dt1 = derived1->components;
422 dt2 = derived2->components;
424 /* Since subtypes of SEQUENCE types must be SEQUENCE types as well, a
425 simple test can speed things up. Otherwise, lots of things have to
429 if (strcmp (dt1->name, dt2->name) != 0)
432 if (dt1->attr.access != dt2->attr.access)
435 if (dt1->attr.pointer != dt2->attr.pointer)
438 if (dt1->attr.dimension != dt2->attr.dimension)
441 if (dt1->attr.allocatable != dt2->attr.allocatable)
444 if (dt1->attr.dimension && gfc_compare_array_spec (dt1->as, dt2->as) == 0)
447 /* Make sure that link lists do not put this function into an
448 endless recursive loop! */
449 if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
450 && !(dt2->ts.type == BT_DERIVED && derived2 == dt2->ts.u.derived)
451 && gfc_compare_types (&dt1->ts, &dt2->ts) == 0)
454 else if ((dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
455 && !(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived))
458 else if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)
459 && (dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived))
465 if (dt1 == NULL && dt2 == NULL)
467 if (dt1 == NULL || dt2 == NULL)
475 /* Compare two typespecs, recursively if necessary. */
478 gfc_compare_types (gfc_typespec *ts1, gfc_typespec *ts2)
480 /* See if one of the typespecs is a BT_VOID, which is what is being used
481 to allow the funcs like c_f_pointer to accept any pointer type.
482 TODO: Possibly should narrow this to just the one typespec coming in
483 that is for the formal arg, but oh well. */
484 if (ts1->type == BT_VOID || ts2->type == BT_VOID)
487 if (ts1->type == BT_CLASS
488 && ts1->u.derived->components->ts.u.derived->attr.unlimited_polymorphic)
492 if (ts2->type == BT_CLASS && ts1->type == BT_DERIVED
493 && ts2->u.derived->components->ts.u.derived->attr.unlimited_polymorphic
494 && (ts1->u.derived->attr.sequence || ts1->u.derived->attr.is_bind_c))
497 if (ts1->type != ts2->type
498 && ((ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
499 || (ts2->type != BT_DERIVED && ts2->type != BT_CLASS)))
501 if (ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
502 return (ts1->kind == ts2->kind);
504 /* Compare derived types. */
505 if (gfc_type_compatible (ts1, ts2))
508 return gfc_compare_derived_types (ts1->u.derived ,ts2->u.derived);
512 /* Given two symbols that are formal arguments, compare their ranks
513 and types. Returns nonzero if they have the same rank and type,
517 compare_type_rank (gfc_symbol *s1, gfc_symbol *s2)
519 gfc_array_spec *as1, *as2;
522 as1 = (s1->ts.type == BT_CLASS) ? CLASS_DATA (s1)->as : s1->as;
523 as2 = (s2->ts.type == BT_CLASS) ? CLASS_DATA (s2)->as : s2->as;
525 r1 = as1 ? as1->rank : 0;
526 r2 = as2 ? as2->rank : 0;
529 && (!as1 || as1->type != AS_ASSUMED_RANK)
530 && (!as2 || as2->type != AS_ASSUMED_RANK))
531 return 0; /* Ranks differ. */
533 return gfc_compare_types (&s1->ts, &s2->ts)
534 || s1->ts.type == BT_ASSUMED || s2->ts.type == BT_ASSUMED;
538 /* Given two symbols that are formal arguments, compare their types
539 and rank and their formal interfaces if they are both dummy
540 procedures. Returns nonzero if the same, zero if different. */
543 compare_type_rank_if (gfc_symbol *s1, gfc_symbol *s2)
545 if (s1 == NULL || s2 == NULL)
546 return s1 == s2 ? 1 : 0;
551 if (s1->attr.flavor != FL_PROCEDURE && s2->attr.flavor != FL_PROCEDURE)
552 return compare_type_rank (s1, s2);
554 if (s1->attr.flavor != FL_PROCEDURE || s2->attr.flavor != FL_PROCEDURE)
557 /* At this point, both symbols are procedures. It can happen that
558 external procedures are compared, where one is identified by usage
559 to be a function or subroutine but the other is not. Check TKR
560 nonetheless for these cases. */
561 if (s1->attr.function == 0 && s1->attr.subroutine == 0)
562 return s1->attr.external == 1 ? compare_type_rank (s1, s2) : 0;
564 if (s2->attr.function == 0 && s2->attr.subroutine == 0)
565 return s2->attr.external == 1 ? compare_type_rank (s1, s2) : 0;
567 /* Now the type of procedure has been identified. */
568 if (s1->attr.function != s2->attr.function
569 || s1->attr.subroutine != s2->attr.subroutine)
572 if (s1->attr.function && compare_type_rank (s1, s2) == 0)
575 /* Originally, gfortran recursed here to check the interfaces of passed
576 procedures. This is explicitly not required by the standard. */
581 /* Given a formal argument list and a keyword name, search the list
582 for that keyword. Returns the correct symbol node if found, NULL
586 find_keyword_arg (const char *name, gfc_formal_arglist *f)
588 for (; f; f = f->next)
589 if (strcmp (f->sym->name, name) == 0)
596 /******** Interface checking subroutines **********/
599 /* Given an operator interface and the operator, make sure that all
600 interfaces for that operator are legal. */
603 gfc_check_operator_interface (gfc_symbol *sym, gfc_intrinsic_op op,
606 gfc_formal_arglist *formal;
609 int args, r1, r2, k1, k2;
614 t1 = t2 = BT_UNKNOWN;
615 i1 = i2 = INTENT_UNKNOWN;
619 for (formal = gfc_sym_get_dummy_args (sym); formal; formal = formal->next)
621 gfc_symbol *fsym = formal->sym;
624 gfc_error ("Alternate return cannot appear in operator "
625 "interface at %L", &sym->declared_at);
631 i1 = fsym->attr.intent;
632 r1 = (fsym->as != NULL) ? fsym->as->rank : 0;
638 i2 = fsym->attr.intent;
639 r2 = (fsym->as != NULL) ? fsym->as->rank : 0;
645 /* Only +, - and .not. can be unary operators.
646 .not. cannot be a binary operator. */
647 if (args == 0 || args > 2 || (args == 1 && op != INTRINSIC_PLUS
648 && op != INTRINSIC_MINUS
649 && op != INTRINSIC_NOT)
650 || (args == 2 && op == INTRINSIC_NOT))
652 if (op == INTRINSIC_ASSIGN)
653 gfc_error ("Assignment operator interface at %L must have "
654 "two arguments", &sym->declared_at);
656 gfc_error ("Operator interface at %L has the wrong number of arguments",
661 /* Check that intrinsics are mapped to functions, except
662 INTRINSIC_ASSIGN which should map to a subroutine. */
663 if (op == INTRINSIC_ASSIGN)
665 gfc_formal_arglist *dummy_args;
667 if (!sym->attr.subroutine)
669 gfc_error ("Assignment operator interface at %L must be "
670 "a SUBROUTINE", &sym->declared_at);
674 /* Allowed are (per F2003, 12.3.2.1.2 Defined assignments):
675 - First argument an array with different rank than second,
676 - First argument is a scalar and second an array,
677 - Types and kinds do not conform, or
678 - First argument is of derived type. */
679 dummy_args = gfc_sym_get_dummy_args (sym);
680 if (dummy_args->sym->ts.type != BT_DERIVED
681 && dummy_args->sym->ts.type != BT_CLASS
682 && (r2 == 0 || r1 == r2)
683 && (dummy_args->sym->ts.type == dummy_args->next->sym->ts.type
684 || (gfc_numeric_ts (&dummy_args->sym->ts)
685 && gfc_numeric_ts (&dummy_args->next->sym->ts))))
687 gfc_error ("Assignment operator interface at %L must not redefine "
688 "an INTRINSIC type assignment", &sym->declared_at);
694 if (!sym->attr.function)
696 gfc_error ("Intrinsic operator interface at %L must be a FUNCTION",
702 /* Check intents on operator interfaces. */
703 if (op == INTRINSIC_ASSIGN)
705 if (i1 != INTENT_OUT && i1 != INTENT_INOUT)
707 gfc_error ("First argument of defined assignment at %L must be "
708 "INTENT(OUT) or INTENT(INOUT)", &sym->declared_at);
714 gfc_error ("Second argument of defined assignment at %L must be "
715 "INTENT(IN)", &sym->declared_at);
723 gfc_error ("First argument of operator interface at %L must be "
724 "INTENT(IN)", &sym->declared_at);
728 if (args == 2 && i2 != INTENT_IN)
730 gfc_error ("Second argument of operator interface at %L must be "
731 "INTENT(IN)", &sym->declared_at);
736 /* From now on, all we have to do is check that the operator definition
737 doesn't conflict with an intrinsic operator. The rules for this
738 game are defined in 7.1.2 and 7.1.3 of both F95 and F2003 standards,
739 as well as 12.3.2.1.1 of Fortran 2003:
741 "If the operator is an intrinsic-operator (R310), the number of
742 function arguments shall be consistent with the intrinsic uses of
743 that operator, and the types, kind type parameters, or ranks of the
744 dummy arguments shall differ from those required for the intrinsic
745 operation (7.1.2)." */
747 #define IS_NUMERIC_TYPE(t) \
748 ((t) == BT_INTEGER || (t) == BT_REAL || (t) == BT_COMPLEX)
750 /* Unary ops are easy, do them first. */
751 if (op == INTRINSIC_NOT)
753 if (t1 == BT_LOGICAL)
759 if (args == 1 && (op == INTRINSIC_PLUS || op == INTRINSIC_MINUS))
761 if (IS_NUMERIC_TYPE (t1))
767 /* Character intrinsic operators have same character kind, thus
768 operator definitions with operands of different character kinds
770 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER && k1 != k2)
773 /* Intrinsic operators always perform on arguments of same rank,
774 so different ranks is also always safe. (rank == 0) is an exception
775 to that, because all intrinsic operators are elemental. */
776 if (r1 != r2 && r1 != 0 && r2 != 0)
782 case INTRINSIC_EQ_OS:
784 case INTRINSIC_NE_OS:
785 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
790 case INTRINSIC_MINUS:
791 case INTRINSIC_TIMES:
792 case INTRINSIC_DIVIDE:
793 case INTRINSIC_POWER:
794 if (IS_NUMERIC_TYPE (t1) && IS_NUMERIC_TYPE (t2))
799 case INTRINSIC_GT_OS:
801 case INTRINSIC_GE_OS:
803 case INTRINSIC_LT_OS:
805 case INTRINSIC_LE_OS:
806 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
808 if ((t1 == BT_INTEGER || t1 == BT_REAL)
809 && (t2 == BT_INTEGER || t2 == BT_REAL))
813 case INTRINSIC_CONCAT:
814 if (t1 == BT_CHARACTER && t2 == BT_CHARACTER)
822 if (t1 == BT_LOGICAL && t2 == BT_LOGICAL)
832 #undef IS_NUMERIC_TYPE
835 gfc_error ("Operator interface at %L conflicts with intrinsic interface",
841 /* Given a pair of formal argument lists, we see if the two lists can
842 be distinguished by counting the number of nonoptional arguments of
843 a given type/rank in f1 and seeing if there are less then that
844 number of those arguments in f2 (including optional arguments).
845 Since this test is asymmetric, it has to be called twice to make it
846 symmetric. Returns nonzero if the argument lists are incompatible
847 by this test. This subroutine implements rule 1 of section F03:16.2.3.
848 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */
851 count_types_test (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
852 const char *p1, const char *p2)
854 int rc, ac1, ac2, i, j, k, n1;
855 gfc_formal_arglist *f;
868 for (f = f1; f; f = f->next)
871 /* Build an array of integers that gives the same integer to
872 arguments of the same type/rank. */
873 arg = XCNEWVEC (arginfo, n1);
876 for (i = 0; i < n1; i++, f = f->next)
884 for (i = 0; i < n1; i++)
886 if (arg[i].flag != -1)
889 if (arg[i].sym && (arg[i].sym->attr.optional
890 || (p1 && strcmp (arg[i].sym->name, p1) == 0)))
891 continue; /* Skip OPTIONAL and PASS arguments. */
895 /* Find other non-optional, non-pass arguments of the same type/rank. */
896 for (j = i + 1; j < n1; j++)
897 if ((arg[j].sym == NULL
898 || !(arg[j].sym->attr.optional
899 || (p1 && strcmp (arg[j].sym->name, p1) == 0)))
900 && (compare_type_rank_if (arg[i].sym, arg[j].sym)
901 || compare_type_rank_if (arg[j].sym, arg[i].sym)))
907 /* Now loop over each distinct type found in f1. */
911 for (i = 0; i < n1; i++)
913 if (arg[i].flag != k)
917 for (j = i + 1; j < n1; j++)
918 if (arg[j].flag == k)
921 /* Count the number of non-pass arguments in f2 with that type,
922 including those that are optional. */
925 for (f = f2; f; f = f->next)
926 if ((!p2 || strcmp (f->sym->name, p2) != 0)
927 && (compare_type_rank_if (arg[i].sym, f->sym)
928 || compare_type_rank_if (f->sym, arg[i].sym)))
946 /* Perform the correspondence test in rule (3) of F08:C1215.
947 Returns zero if no argument is found that satisfies this rule,
948 nonzero otherwise. 'p1' and 'p2' are the PASS arguments of both procedures
951 This test is also not symmetric in f1 and f2 and must be called
952 twice. This test finds problems caused by sorting the actual
953 argument list with keywords. For example:
957 INTEGER :: A ; REAL :: B
961 INTEGER :: A ; REAL :: B
965 At this point, 'CALL FOO(A=1, B=1.0)' is ambiguous. */
968 generic_correspondence (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
969 const char *p1, const char *p2)
971 gfc_formal_arglist *f2_save, *g;
978 if (f1->sym->attr.optional)
981 if (p1 && strcmp (f1->sym->name, p1) == 0)
983 if (f2 && p2 && strcmp (f2->sym->name, p2) == 0)
986 if (f2 != NULL && (compare_type_rank (f1->sym, f2->sym)
987 || compare_type_rank (f2->sym, f1->sym))
988 && !((gfc_option.allow_std & GFC_STD_F2008)
989 && ((f1->sym->attr.allocatable && f2->sym->attr.pointer)
990 || (f2->sym->attr.allocatable && f1->sym->attr.pointer))))
993 /* Now search for a disambiguating keyword argument starting at
994 the current non-match. */
995 for (g = f1; g; g = g->next)
997 if (g->sym->attr.optional || (p1 && strcmp (g->sym->name, p1) == 0))
1000 sym = find_keyword_arg (g->sym->name, f2_save);
1001 if (sym == NULL || !compare_type_rank (g->sym, sym)
1002 || ((gfc_option.allow_std & GFC_STD_F2008)
1003 && ((sym->attr.allocatable && g->sym->attr.pointer)
1004 || (sym->attr.pointer && g->sym->attr.allocatable))))
1019 /* Check if the characteristics of two dummy arguments match,
1023 check_dummy_characteristics (gfc_symbol *s1, gfc_symbol *s2,
1024 bool type_must_agree, char *errmsg, int err_len)
1026 /* Check type and rank. */
1027 if (type_must_agree &&
1028 (!compare_type_rank (s1, s2) || !compare_type_rank (s2, s1)))
1030 snprintf (errmsg, err_len, "Type/rank mismatch in argument '%s'",
1036 if (s1->attr.intent != s2->attr.intent)
1038 snprintf (errmsg, err_len, "INTENT mismatch in argument '%s'",
1043 /* Check OPTIONAL attribute. */
1044 if (s1->attr.optional != s2->attr.optional)
1046 snprintf (errmsg, err_len, "OPTIONAL mismatch in argument '%s'",
1051 /* Check ALLOCATABLE attribute. */
1052 if (s1->attr.allocatable != s2->attr.allocatable)
1054 snprintf (errmsg, err_len, "ALLOCATABLE mismatch in argument '%s'",
1059 /* Check POINTER attribute. */
1060 if (s1->attr.pointer != s2->attr.pointer)
1062 snprintf (errmsg, err_len, "POINTER mismatch in argument '%s'",
1067 /* Check TARGET attribute. */
1068 if (s1->attr.target != s2->attr.target)
1070 snprintf (errmsg, err_len, "TARGET mismatch in argument '%s'",
1075 /* FIXME: Do more comprehensive testing of attributes, like e.g.
1076 ASYNCHRONOUS, CONTIGUOUS, VALUE, VOLATILE, etc. */
1078 /* Check interface of dummy procedures. */
1079 if (s1->attr.flavor == FL_PROCEDURE)
1082 if (!gfc_compare_interfaces (s1, s2, s2->name, 0, 1, err, sizeof(err),
1085 snprintf (errmsg, err_len, "Interface mismatch in dummy procedure "
1086 "'%s': %s", s1->name, err);
1091 /* Check string length. */
1092 if (s1->ts.type == BT_CHARACTER
1093 && s1->ts.u.cl && s1->ts.u.cl->length
1094 && s2->ts.u.cl && s2->ts.u.cl->length)
1096 int compval = gfc_dep_compare_expr (s1->ts.u.cl->length,
1097 s2->ts.u.cl->length);
1103 snprintf (errmsg, err_len, "Character length mismatch "
1104 "in argument '%s'", s1->name);
1108 /* FIXME: Implement a warning for this case.
1109 gfc_warning ("Possible character length mismatch in argument '%s'",
1117 gfc_internal_error ("check_dummy_characteristics: Unexpected result "
1118 "%i of gfc_dep_compare_expr", compval);
1123 /* Check array shape. */
1124 if (s1->as && s2->as)
1127 gfc_expr *shape1, *shape2;
1129 if (s1->as->type != s2->as->type)
1131 snprintf (errmsg, err_len, "Shape mismatch in argument '%s'",
1136 if (s1->as->type == AS_EXPLICIT)
1137 for (i = 0; i < s1->as->rank + s1->as->corank; i++)
1139 shape1 = gfc_subtract (gfc_copy_expr (s1->as->upper[i]),
1140 gfc_copy_expr (s1->as->lower[i]));
1141 shape2 = gfc_subtract (gfc_copy_expr (s2->as->upper[i]),
1142 gfc_copy_expr (s2->as->lower[i]));
1143 compval = gfc_dep_compare_expr (shape1, shape2);
1144 gfc_free_expr (shape1);
1145 gfc_free_expr (shape2);
1151 snprintf (errmsg, err_len, "Shape mismatch in dimension %i of "
1152 "argument '%s'", i + 1, s1->name);
1156 /* FIXME: Implement a warning for this case.
1157 gfc_warning ("Possible shape mismatch in argument '%s'",
1165 gfc_internal_error ("check_dummy_characteristics: Unexpected "
1166 "result %i of gfc_dep_compare_expr",
1177 /* Check if the characteristics of two function results match,
1181 check_result_characteristics (gfc_symbol *s1, gfc_symbol *s2,
1182 char *errmsg, int err_len)
1184 gfc_symbol *r1, *r2;
1186 if (s1->ts.interface && s1->ts.interface->result)
1187 r1 = s1->ts.interface->result;
1189 r1 = s1->result ? s1->result : s1;
1191 if (s2->ts.interface && s2->ts.interface->result)
1192 r2 = s2->ts.interface->result;
1194 r2 = s2->result ? s2->result : s2;
1196 if (r1->ts.type == BT_UNKNOWN)
1199 /* Check type and rank. */
1200 if (!compare_type_rank (r1, r2))
1202 snprintf (errmsg, err_len, "Type/rank mismatch in function result");
1206 /* Check ALLOCATABLE attribute. */
1207 if (r1->attr.allocatable != r2->attr.allocatable)
1209 snprintf (errmsg, err_len, "ALLOCATABLE attribute mismatch in "
1214 /* Check POINTER attribute. */
1215 if (r1->attr.pointer != r2->attr.pointer)
1217 snprintf (errmsg, err_len, "POINTER attribute mismatch in "
1222 /* Check CONTIGUOUS attribute. */
1223 if (r1->attr.contiguous != r2->attr.contiguous)
1225 snprintf (errmsg, err_len, "CONTIGUOUS attribute mismatch in "
1230 /* Check PROCEDURE POINTER attribute. */
1231 if (r1 != s1 && r1->attr.proc_pointer != r2->attr.proc_pointer)
1233 snprintf (errmsg, err_len, "PROCEDURE POINTER mismatch in "
1238 /* Check string length. */
1239 if (r1->ts.type == BT_CHARACTER && r1->ts.u.cl && r2->ts.u.cl)
1241 if (r1->ts.deferred != r2->ts.deferred)
1243 snprintf (errmsg, err_len, "Character length mismatch "
1244 "in function result");
1248 if (r1->ts.u.cl->length)
1250 int compval = gfc_dep_compare_expr (r1->ts.u.cl->length,
1251 r2->ts.u.cl->length);
1257 snprintf (errmsg, err_len, "Character length mismatch "
1258 "in function result");
1262 /* FIXME: Implement a warning for this case.
1263 snprintf (errmsg, err_len, "Possible character length mismatch "
1264 "in function result");*/
1271 gfc_internal_error ("check_result_characteristics (1): Unexpected "
1272 "result %i of gfc_dep_compare_expr", compval);
1278 /* Check array shape. */
1279 if (!r1->attr.allocatable && !r1->attr.pointer && r1->as && r2->as)
1282 gfc_expr *shape1, *shape2;
1284 if (r1->as->type != r2->as->type)
1286 snprintf (errmsg, err_len, "Shape mismatch in function result");
1290 if (r1->as->type == AS_EXPLICIT)
1291 for (i = 0; i < r1->as->rank + r1->as->corank; i++)
1293 shape1 = gfc_subtract (gfc_copy_expr (r1->as->upper[i]),
1294 gfc_copy_expr (r1->as->lower[i]));
1295 shape2 = gfc_subtract (gfc_copy_expr (r2->as->upper[i]),
1296 gfc_copy_expr (r2->as->lower[i]));
1297 compval = gfc_dep_compare_expr (shape1, shape2);
1298 gfc_free_expr (shape1);
1299 gfc_free_expr (shape2);
1305 snprintf (errmsg, err_len, "Shape mismatch in dimension %i of "
1306 "function result", i + 1);
1310 /* FIXME: Implement a warning for this case.
1311 gfc_warning ("Possible shape mismatch in return value");*/
1318 gfc_internal_error ("check_result_characteristics (2): "
1319 "Unexpected result %i of "
1320 "gfc_dep_compare_expr", compval);
1330 /* 'Compare' two formal interfaces associated with a pair of symbols.
1331 We return nonzero if there exists an actual argument list that
1332 would be ambiguous between the two interfaces, zero otherwise.
1333 'strict_flag' specifies whether all the characteristics are
1334 required to match, which is not the case for ambiguity checks.
1335 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */
1338 gfc_compare_interfaces (gfc_symbol *s1, gfc_symbol *s2, const char *name2,
1339 int generic_flag, int strict_flag,
1340 char *errmsg, int err_len,
1341 const char *p1, const char *p2)
1343 gfc_formal_arglist *f1, *f2;
1345 gcc_assert (name2 != NULL);
1347 if (s1->attr.function && (s2->attr.subroutine
1348 || (!s2->attr.function && s2->ts.type == BT_UNKNOWN
1349 && gfc_get_default_type (name2, s2->ns)->type == BT_UNKNOWN)))
1352 snprintf (errmsg, err_len, "'%s' is not a function", name2);
1356 if (s1->attr.subroutine && s2->attr.function)
1359 snprintf (errmsg, err_len, "'%s' is not a subroutine", name2);
1363 /* Do strict checks on all characteristics
1364 (for dummy procedures and procedure pointer assignments). */
1365 if (!generic_flag && strict_flag)
1367 if (s1->attr.function && s2->attr.function)
1369 /* If both are functions, check result characteristics. */
1370 if (check_result_characteristics (s1, s2, errmsg, err_len)
1375 if (s1->attr.pure && !s2->attr.pure)
1377 snprintf (errmsg, err_len, "Mismatch in PURE attribute");
1380 if (s1->attr.elemental && !s2->attr.elemental)
1382 snprintf (errmsg, err_len, "Mismatch in ELEMENTAL attribute");
1387 if (s1->attr.if_source == IFSRC_UNKNOWN
1388 || s2->attr.if_source == IFSRC_UNKNOWN)
1391 f1 = gfc_sym_get_dummy_args (s1);
1392 f2 = gfc_sym_get_dummy_args (s2);
1394 if (f1 == NULL && f2 == NULL)
1395 return 1; /* Special case: No arguments. */
1399 if (count_types_test (f1, f2, p1, p2)
1400 || count_types_test (f2, f1, p2, p1))
1402 if (generic_correspondence (f1, f2, p1, p2)
1403 || generic_correspondence (f2, f1, p2, p1))
1407 /* Perform the abbreviated correspondence test for operators (the
1408 arguments cannot be optional and are always ordered correctly).
1409 This is also done when comparing interfaces for dummy procedures and in
1410 procedure pointer assignments. */
1414 /* Check existence. */
1415 if (f1 == NULL && f2 == NULL)
1417 if (f1 == NULL || f2 == NULL)
1420 snprintf (errmsg, err_len, "'%s' has the wrong number of "
1421 "arguments", name2);
1425 if (UNLIMITED_POLY (f1->sym))
1430 /* Check all characteristics. */
1431 if (check_dummy_characteristics (f1->sym, f2->sym,
1432 true, errmsg, err_len) == FAILURE)
1435 else if (!compare_type_rank (f2->sym, f1->sym))
1437 /* Only check type and rank. */
1439 snprintf (errmsg, err_len, "Type/rank mismatch in argument '%s'",
1452 /* Given a pointer to an interface pointer, remove duplicate
1453 interfaces and make sure that all symbols are either functions
1454 or subroutines, and all of the same kind. Returns nonzero if
1455 something goes wrong. */
1458 check_interface0 (gfc_interface *p, const char *interface_name)
1460 gfc_interface *psave, *q, *qlast;
1463 for (; p; p = p->next)
1465 /* Make sure all symbols in the interface have been defined as
1466 functions or subroutines. */
1467 if (((!p->sym->attr.function && !p->sym->attr.subroutine)
1468 || !p->sym->attr.if_source)
1469 && p->sym->attr.flavor != FL_DERIVED)
1471 if (p->sym->attr.external)
1472 gfc_error ("Procedure '%s' in %s at %L has no explicit interface",
1473 p->sym->name, interface_name, &p->sym->declared_at);
1475 gfc_error ("Procedure '%s' in %s at %L is neither function nor "
1476 "subroutine", p->sym->name, interface_name,
1477 &p->sym->declared_at);
1481 /* Verify that procedures are either all SUBROUTINEs or all FUNCTIONs. */
1482 if ((psave->sym->attr.function && !p->sym->attr.function
1483 && p->sym->attr.flavor != FL_DERIVED)
1484 || (psave->sym->attr.subroutine && !p->sym->attr.subroutine))
1486 if (p->sym->attr.flavor != FL_DERIVED)
1487 gfc_error ("In %s at %L procedures must be either all SUBROUTINEs"
1488 " or all FUNCTIONs", interface_name,
1489 &p->sym->declared_at);
1491 gfc_error ("In %s at %L procedures must be all FUNCTIONs as the "
1492 "generic name is also the name of a derived type",
1493 interface_name, &p->sym->declared_at);
1497 /* F2003, C1207. F2008, C1207. */
1498 if (p->sym->attr.proc == PROC_INTERNAL
1499 && gfc_notify_std (GFC_STD_F2008, "Internal procedure "
1500 "'%s' in %s at %L", p->sym->name, interface_name,
1501 &p->sym->declared_at) == FAILURE)
1506 /* Remove duplicate interfaces in this interface list. */
1507 for (; p; p = p->next)
1511 for (q = p->next; q;)
1513 if (p->sym != q->sym)
1520 /* Duplicate interface. */
1521 qlast->next = q->next;
1532 /* Check lists of interfaces to make sure that no two interfaces are
1533 ambiguous. Duplicate interfaces (from the same symbol) are OK here. */
1536 check_interface1 (gfc_interface *p, gfc_interface *q0,
1537 int generic_flag, const char *interface_name,
1541 for (; p; p = p->next)
1542 for (q = q0; q; q = q->next)
1544 if (p->sym == q->sym)
1545 continue; /* Duplicates OK here. */
1547 if (p->sym->name == q->sym->name && p->sym->module == q->sym->module)
1550 if (p->sym->attr.flavor != FL_DERIVED
1551 && q->sym->attr.flavor != FL_DERIVED
1552 && gfc_compare_interfaces (p->sym, q->sym, q->sym->name,
1553 generic_flag, 0, NULL, 0, NULL, NULL))
1556 gfc_error ("Ambiguous interfaces '%s' and '%s' in %s at %L",
1557 p->sym->name, q->sym->name, interface_name,
1559 else if (!p->sym->attr.use_assoc && q->sym->attr.use_assoc)
1560 gfc_warning ("Ambiguous interfaces '%s' and '%s' in %s at %L",
1561 p->sym->name, q->sym->name, interface_name,
1564 gfc_warning ("Although not referenced, '%s' has ambiguous "
1565 "interfaces at %L", interface_name, &p->where);
1573 /* Check the generic and operator interfaces of symbols to make sure
1574 that none of the interfaces conflict. The check has to be done
1575 after all of the symbols are actually loaded. */
1578 check_sym_interfaces (gfc_symbol *sym)
1580 char interface_name[100];
1583 if (sym->ns != gfc_current_ns)
1586 if (sym->generic != NULL)
1588 sprintf (interface_name, "generic interface '%s'", sym->name);
1589 if (check_interface0 (sym->generic, interface_name))
1592 for (p = sym->generic; p; p = p->next)
1594 if (p->sym->attr.mod_proc
1595 && (p->sym->attr.if_source != IFSRC_DECL
1596 || p->sym->attr.procedure))
1598 gfc_error ("'%s' at %L is not a module procedure",
1599 p->sym->name, &p->where);
1604 /* Originally, this test was applied to host interfaces too;
1605 this is incorrect since host associated symbols, from any
1606 source, cannot be ambiguous with local symbols. */
1607 check_interface1 (sym->generic, sym->generic, 1, interface_name,
1608 sym->attr.referenced || !sym->attr.use_assoc);
1614 check_uop_interfaces (gfc_user_op *uop)
1616 char interface_name[100];
1620 sprintf (interface_name, "operator interface '%s'", uop->name);
1621 if (check_interface0 (uop->op, interface_name))
1624 for (ns = gfc_current_ns; ns; ns = ns->parent)
1626 uop2 = gfc_find_uop (uop->name, ns);
1630 check_interface1 (uop->op, uop2->op, 0,
1631 interface_name, true);
1635 /* Given an intrinsic op, return an equivalent op if one exists,
1636 or INTRINSIC_NONE otherwise. */
1639 gfc_equivalent_op (gfc_intrinsic_op op)
1644 return INTRINSIC_EQ_OS;
1646 case INTRINSIC_EQ_OS:
1647 return INTRINSIC_EQ;
1650 return INTRINSIC_NE_OS;
1652 case INTRINSIC_NE_OS:
1653 return INTRINSIC_NE;
1656 return INTRINSIC_GT_OS;
1658 case INTRINSIC_GT_OS:
1659 return INTRINSIC_GT;
1662 return INTRINSIC_GE_OS;
1664 case INTRINSIC_GE_OS:
1665 return INTRINSIC_GE;
1668 return INTRINSIC_LT_OS;
1670 case INTRINSIC_LT_OS:
1671 return INTRINSIC_LT;
1674 return INTRINSIC_LE_OS;
1676 case INTRINSIC_LE_OS:
1677 return INTRINSIC_LE;
1680 return INTRINSIC_NONE;
1684 /* For the namespace, check generic, user operator and intrinsic
1685 operator interfaces for consistency and to remove duplicate
1686 interfaces. We traverse the whole namespace, counting on the fact
1687 that most symbols will not have generic or operator interfaces. */
1690 gfc_check_interfaces (gfc_namespace *ns)
1692 gfc_namespace *old_ns, *ns2;
1693 char interface_name[100];
1696 old_ns = gfc_current_ns;
1697 gfc_current_ns = ns;
1699 gfc_traverse_ns (ns, check_sym_interfaces);
1701 gfc_traverse_user_op (ns, check_uop_interfaces);
1703 for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++)
1705 if (i == INTRINSIC_USER)
1708 if (i == INTRINSIC_ASSIGN)
1709 strcpy (interface_name, "intrinsic assignment operator");
1711 sprintf (interface_name, "intrinsic '%s' operator",
1712 gfc_op2string ((gfc_intrinsic_op) i));
1714 if (check_interface0 (ns->op[i], interface_name))
1718 gfc_check_operator_interface (ns->op[i]->sym, (gfc_intrinsic_op) i,
1721 for (ns2 = ns; ns2; ns2 = ns2->parent)
1723 gfc_intrinsic_op other_op;
1725 if (check_interface1 (ns->op[i], ns2->op[i], 0,
1726 interface_name, true))
1729 /* i should be gfc_intrinsic_op, but has to be int with this cast
1730 here for stupid C++ compatibility rules. */
1731 other_op = gfc_equivalent_op ((gfc_intrinsic_op) i);
1732 if (other_op != INTRINSIC_NONE
1733 && check_interface1 (ns->op[i], ns2->op[other_op],
1734 0, interface_name, true))
1740 gfc_current_ns = old_ns;
1745 symbol_rank (gfc_symbol *sym)
1747 if (sym->ts.type == BT_CLASS && CLASS_DATA (sym)->as)
1748 return CLASS_DATA (sym)->as->rank;
1750 return (sym->as == NULL) ? 0 : sym->as->rank;
1754 /* Given a symbol of a formal argument list and an expression, if the
1755 formal argument is allocatable, check that the actual argument is
1756 allocatable. Returns nonzero if compatible, zero if not compatible. */
1759 compare_allocatable (gfc_symbol *formal, gfc_expr *actual)
1761 symbol_attribute attr;
1763 if (formal->attr.allocatable
1764 || (formal->ts.type == BT_CLASS && CLASS_DATA (formal)->attr.allocatable))
1766 attr = gfc_expr_attr (actual);
1767 if (!attr.allocatable)
1775 /* Given a symbol of a formal argument list and an expression, if the
1776 formal argument is a pointer, see if the actual argument is a
1777 pointer. Returns nonzero if compatible, zero if not compatible. */
1780 compare_pointer (gfc_symbol *formal, gfc_expr *actual)
1782 symbol_attribute attr;
1784 if (formal->attr.pointer
1785 || (formal->ts.type == BT_CLASS && CLASS_DATA (formal)
1786 && CLASS_DATA (formal)->attr.class_pointer))
1788 attr = gfc_expr_attr (actual);
1790 /* Fortran 2008 allows non-pointer actual arguments. */
1791 if (!attr.pointer && attr.target && formal->attr.intent == INTENT_IN)
1802 /* Emit clear error messages for rank mismatch. */
1805 argument_rank_mismatch (const char *name, locus *where,
1806 int rank1, int rank2)
1809 /* TS 29113, C407b. */
1812 gfc_error ("The assumed-rank array at %L requires that the dummy argument"
1813 " '%s' has assumed-rank", where, name);
1815 else if (rank1 == 0)
1817 gfc_error ("Rank mismatch in argument '%s' at %L "
1818 "(scalar and rank-%d)", name, where, rank2);
1820 else if (rank2 == 0)
1822 gfc_error ("Rank mismatch in argument '%s' at %L "
1823 "(rank-%d and scalar)", name, where, rank1);
1827 gfc_error ("Rank mismatch in argument '%s' at %L "
1828 "(rank-%d and rank-%d)", name, where, rank1, rank2);
1833 /* Given a symbol of a formal argument list and an expression, see if
1834 the two are compatible as arguments. Returns nonzero if
1835 compatible, zero if not compatible. */
1838 compare_parameter (gfc_symbol *formal, gfc_expr *actual,
1839 int ranks_must_agree, int is_elemental, locus *where)
1842 bool rank_check, is_pointer;
1844 /* If the formal arg has type BT_VOID, it's to one of the iso_c_binding
1845 procs c_f_pointer or c_f_procpointer, and we need to accept most
1846 pointers the user could give us. This should allow that. */
1847 if (formal->ts.type == BT_VOID)
1850 if (formal->ts.type == BT_DERIVED
1851 && formal->ts.u.derived && formal->ts.u.derived->ts.is_iso_c
1852 && actual->ts.type == BT_DERIVED
1853 && actual->ts.u.derived && actual->ts.u.derived->ts.is_iso_c)
1856 if (formal->ts.type == BT_CLASS && actual->ts.type == BT_DERIVED)
1857 /* Make sure the vtab symbol is present when
1858 the module variables are generated. */
1859 gfc_find_derived_vtab (actual->ts.u.derived);
1861 if (actual->ts.type == BT_PROCEDURE)
1864 gfc_symbol *act_sym = actual->symtree->n.sym;
1866 if (formal->attr.flavor != FL_PROCEDURE)
1869 gfc_error ("Invalid procedure argument at %L", &actual->where);
1873 if (!gfc_compare_interfaces (formal, act_sym, act_sym->name, 0, 1, err,
1874 sizeof(err), NULL, NULL))
1877 gfc_error ("Interface mismatch in dummy procedure '%s' at %L: %s",
1878 formal->name, &actual->where, err);
1882 if (formal->attr.function && !act_sym->attr.function)
1884 gfc_add_function (&act_sym->attr, act_sym->name,
1885 &act_sym->declared_at);
1886 if (act_sym->ts.type == BT_UNKNOWN
1887 && gfc_set_default_type (act_sym, 1, act_sym->ns) == FAILURE)
1890 else if (formal->attr.subroutine && !act_sym->attr.subroutine)
1891 gfc_add_subroutine (&act_sym->attr, act_sym->name,
1892 &act_sym->declared_at);
1898 if (formal->attr.pointer && formal->attr.contiguous
1899 && !gfc_is_simply_contiguous (actual, true))
1902 gfc_error ("Actual argument to contiguous pointer dummy '%s' at %L "
1903 "must be simply contiguous", formal->name, &actual->where);
1907 if ((actual->expr_type != EXPR_NULL || actual->ts.type != BT_UNKNOWN)
1908 && actual->ts.type != BT_HOLLERITH
1909 && formal->ts.type != BT_ASSUMED
1910 && !gfc_compare_types (&formal->ts, &actual->ts)
1911 && !(formal->ts.type == BT_DERIVED && actual->ts.type == BT_CLASS
1912 && gfc_compare_derived_types (formal->ts.u.derived,
1913 CLASS_DATA (actual)->ts.u.derived)))
1916 gfc_error ("Type mismatch in argument '%s' at %L; passed %s to %s",
1917 formal->name, &actual->where, gfc_typename (&actual->ts),
1918 gfc_typename (&formal->ts));
1922 /* F2008, 12.5.2.5; IR F08/0073. */
1923 if (formal->ts.type == BT_CLASS && actual->expr_type != EXPR_NULL
1924 && ((CLASS_DATA (formal)->attr.class_pointer
1925 && !formal->attr.intent == INTENT_IN)
1926 || CLASS_DATA (formal)->attr.allocatable))
1928 if (actual->ts.type != BT_CLASS)
1931 gfc_error ("Actual argument to '%s' at %L must be polymorphic",
1932 formal->name, &actual->where);
1935 if (!gfc_compare_derived_types (CLASS_DATA (actual)->ts.u.derived,
1936 CLASS_DATA (formal)->ts.u.derived))
1939 gfc_error ("Actual argument to '%s' at %L must have the same "
1940 "declared type", formal->name, &actual->where);
1945 /* F08: 12.5.2.5 Allocatable and pointer dummy variables. However, this
1946 is necessary also for F03, so retain error for both.
1947 NOTE: Other type/kind errors pre-empt this error. Since they are F03
1948 compatible, no attempt has been made to channel to this one. */
1949 if (UNLIMITED_POLY (formal) && !UNLIMITED_POLY (actual)
1950 && (CLASS_DATA (formal)->attr.allocatable
1951 ||CLASS_DATA (formal)->attr.class_pointer))
1954 gfc_error ("Actual argument to '%s' at %L must be unlimited "
1955 "polymorphic since the formal argument is a "
1956 "pointer or allocatable unlimited polymorphic "
1957 "entity [F2008: 12.5.2.5]", formal->name,
1962 if (formal->attr.codimension && !gfc_is_coarray (actual))
1965 gfc_error ("Actual argument to '%s' at %L must be a coarray",
1966 formal->name, &actual->where);
1970 if (formal->attr.codimension && formal->attr.allocatable)
1972 gfc_ref *last = NULL;
1974 for (ref = actual->ref; ref; ref = ref->next)
1975 if (ref->type == REF_COMPONENT)
1978 /* F2008, 12.5.2.6. */
1979 if ((last && last->u.c.component->as->corank != formal->as->corank)
1981 && actual->symtree->n.sym->as->corank != formal->as->corank))
1984 gfc_error ("Corank mismatch in argument '%s' at %L (%d and %d)",
1985 formal->name, &actual->where, formal->as->corank,
1986 last ? last->u.c.component->as->corank
1987 : actual->symtree->n.sym->as->corank);
1992 if (formal->attr.codimension)
1994 /* F2008, 12.5.2.8. */
1995 if (formal->attr.dimension
1996 && (formal->attr.contiguous || formal->as->type != AS_ASSUMED_SHAPE)
1997 && gfc_expr_attr (actual).dimension
1998 && !gfc_is_simply_contiguous (actual, true))
2001 gfc_error ("Actual argument to '%s' at %L must be simply "
2002 "contiguous", formal->name, &actual->where);
2006 /* F2008, C1303 and C1304. */
2007 if (formal->attr.intent != INTENT_INOUT
2008 && (((formal->ts.type == BT_DERIVED || formal->ts.type == BT_CLASS)
2009 && formal->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
2010 && formal->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
2011 || formal->attr.lock_comp))
2015 gfc_error ("Actual argument to non-INTENT(INOUT) dummy '%s' at %L, "
2016 "which is LOCK_TYPE or has a LOCK_TYPE component",
2017 formal->name, &actual->where);
2022 /* F2008, C1239/C1240. */
2023 if (actual->expr_type == EXPR_VARIABLE
2024 && (actual->symtree->n.sym->attr.asynchronous
2025 || actual->symtree->n.sym->attr.volatile_)
2026 && (formal->attr.asynchronous || formal->attr.volatile_)
2027 && actual->rank && !gfc_is_simply_contiguous (actual, true)
2028 && ((formal->as->type != AS_ASSUMED_SHAPE && !formal->attr.pointer)
2029 || formal->attr.contiguous))
2032 gfc_error ("Dummy argument '%s' has to be a pointer or assumed-shape "
2033 "array without CONTIGUOUS attribute - as actual argument at"
2034 " %L is not simply contiguous and both are ASYNCHRONOUS "
2035 "or VOLATILE", formal->name, &actual->where);
2039 if (formal->attr.allocatable && !formal->attr.codimension
2040 && gfc_expr_attr (actual).codimension)
2042 if (formal->attr.intent == INTENT_OUT)
2045 gfc_error ("Passing coarray at %L to allocatable, noncoarray, "
2046 "INTENT(OUT) dummy argument '%s'", &actual->where,
2050 else if (gfc_option.warn_surprising && where
2051 && formal->attr.intent != INTENT_IN)
2052 gfc_warning ("Passing coarray at %L to allocatable, noncoarray dummy "
2053 "argument '%s', which is invalid if the allocation status"
2054 " is modified", &actual->where, formal->name);
2057 /* If the rank is the same or the formal argument has assumed-rank. */
2058 if (symbol_rank (formal) == actual->rank || symbol_rank (formal) == -1)
2061 if (actual->ts.type == BT_CLASS && CLASS_DATA (actual)->as
2062 && CLASS_DATA (actual)->as->rank == symbol_rank (formal))
2065 rank_check = where != NULL && !is_elemental && formal->as
2066 && (formal->as->type == AS_ASSUMED_SHAPE
2067 || formal->as->type == AS_DEFERRED)
2068 && actual->expr_type != EXPR_NULL;
2070 /* Scalar & coindexed, see: F2008, Section 12.5.2.4. */
2071 if (rank_check || ranks_must_agree
2072 || (formal->attr.pointer && actual->expr_type != EXPR_NULL)
2073 || (actual->rank != 0 && !(is_elemental || formal->attr.dimension))
2074 || (actual->rank == 0
2075 && ((formal->ts.type == BT_CLASS
2076 && CLASS_DATA (formal)->as->type == AS_ASSUMED_SHAPE)
2077 || (formal->ts.type != BT_CLASS
2078 && formal->as->type == AS_ASSUMED_SHAPE))
2079 && actual->expr_type != EXPR_NULL)
2080 || (actual->rank == 0 && formal->attr.dimension
2081 && gfc_is_coindexed (actual)))
2084 argument_rank_mismatch (formal->name, &actual->where,
2085 symbol_rank (formal), actual->rank);
2088 else if (actual->rank != 0 && (is_elemental || formal->attr.dimension))
2091 /* At this point, we are considering a scalar passed to an array. This
2092 is valid (cf. F95 12.4.1.1, F2003 12.4.1.2, and F2008 12.5.2.4),
2093 - if the actual argument is (a substring of) an element of a
2094 non-assumed-shape/non-pointer/non-polymorphic array; or
2095 - (F2003) if the actual argument is of type character of default/c_char
2098 is_pointer = actual->expr_type == EXPR_VARIABLE
2099 ? actual->symtree->n.sym->attr.pointer : false;
2101 for (ref = actual->ref; ref; ref = ref->next)
2103 if (ref->type == REF_COMPONENT)
2104 is_pointer = ref->u.c.component->attr.pointer;
2105 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT
2106 && ref->u.ar.dimen > 0
2108 || (ref->next->type == REF_SUBSTRING && !ref->next->next)))
2112 if (actual->ts.type == BT_CLASS && actual->expr_type != EXPR_NULL)
2115 gfc_error ("Polymorphic scalar passed to array dummy argument '%s' "
2116 "at %L", formal->name, &actual->where);
2120 if (actual->expr_type != EXPR_NULL && ref && actual->ts.type != BT_CHARACTER
2121 && (is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE))
2124 gfc_error ("Element of assumed-shaped or pointer "
2125 "array passed to array dummy argument '%s' at %L",
2126 formal->name, &actual->where);
2130 if (actual->ts.type == BT_CHARACTER && actual->expr_type != EXPR_NULL
2131 && (!ref || is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE))
2133 if (formal->ts.kind != 1 && (gfc_option.allow_std & GFC_STD_GNU) == 0)
2136 gfc_error ("Extension: Scalar non-default-kind, non-C_CHAR-kind "
2137 "CHARACTER actual argument with array dummy argument "
2138 "'%s' at %L", formal->name, &actual->where);
2142 if (where && (gfc_option.allow_std & GFC_STD_F2003) == 0)
2144 gfc_error ("Fortran 2003: Scalar CHARACTER actual argument with "
2145 "array dummy argument '%s' at %L",
2146 formal->name, &actual->where);
2149 else if ((gfc_option.allow_std & GFC_STD_F2003) == 0)
2155 if (ref == NULL && actual->expr_type != EXPR_NULL)
2158 argument_rank_mismatch (formal->name, &actual->where,
2159 symbol_rank (formal), actual->rank);
2167 /* Returns the storage size of a symbol (formal argument) or
2168 zero if it cannot be determined. */
2170 static unsigned long
2171 get_sym_storage_size (gfc_symbol *sym)
2174 unsigned long strlen, elements;
2176 if (sym->ts.type == BT_CHARACTER)
2178 if (sym->ts.u.cl && sym->ts.u.cl->length
2179 && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT)
2180 strlen = mpz_get_ui (sym->ts.u.cl->length->value.integer);
2187 if (symbol_rank (sym) == 0)
2191 if (sym->as->type != AS_EXPLICIT)
2193 for (i = 0; i < sym->as->rank; i++)
2195 if (sym->as->upper[i]->expr_type != EXPR_CONSTANT
2196 || sym->as->lower[i]->expr_type != EXPR_CONSTANT)
2199 elements *= mpz_get_si (sym->as->upper[i]->value.integer)
2200 - mpz_get_si (sym->as->lower[i]->value.integer) + 1L;
2203 return strlen*elements;
2207 /* Returns the storage size of an expression (actual argument) or
2208 zero if it cannot be determined. For an array element, it returns
2209 the remaining size as the element sequence consists of all storage
2210 units of the actual argument up to the end of the array. */
2212 static unsigned long
2213 get_expr_storage_size (gfc_expr *e)
2216 long int strlen, elements;
2217 long int substrlen = 0;
2218 bool is_str_storage = false;
2224 if (e->ts.type == BT_CHARACTER)
2226 if (e->ts.u.cl && e->ts.u.cl->length
2227 && e->ts.u.cl->length->expr_type == EXPR_CONSTANT)
2228 strlen = mpz_get_si (e->ts.u.cl->length->value.integer);
2229 else if (e->expr_type == EXPR_CONSTANT
2230 && (e->ts.u.cl == NULL || e->ts.u.cl->length == NULL))
2231 strlen = e->value.character.length;
2236 strlen = 1; /* Length per element. */
2238 if (e->rank == 0 && !e->ref)
2246 for (i = 0; i < e->rank; i++)
2247 elements *= mpz_get_si (e->shape[i]);
2248 return elements*strlen;
2251 for (ref = e->ref; ref; ref = ref->next)
2253 if (ref->type == REF_SUBSTRING && ref->u.ss.start
2254 && ref->u.ss.start->expr_type == EXPR_CONSTANT)
2258 /* The string length is the substring length.
2259 Set now to full string length. */
2260 if (!ref->u.ss.length || !ref->u.ss.length->length
2261 || ref->u.ss.length->length->expr_type != EXPR_CONSTANT)
2264 strlen = mpz_get_ui (ref->u.ss.length->length->value.integer);
2266 substrlen = strlen - mpz_get_ui (ref->u.ss.start->value.integer) + 1;
2270 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
2271 for (i = 0; i < ref->u.ar.dimen; i++)
2273 long int start, end, stride;
2276 if (ref->u.ar.stride[i])
2278 if (ref->u.ar.stride[i]->expr_type == EXPR_CONSTANT)
2279 stride = mpz_get_si (ref->u.ar.stride[i]->value.integer);
2284 if (ref->u.ar.start[i])
2286 if (ref->u.ar.start[i]->expr_type == EXPR_CONSTANT)
2287 start = mpz_get_si (ref->u.ar.start[i]->value.integer);
2291 else if (ref->u.ar.as->lower[i]
2292 && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT)
2293 start = mpz_get_si (ref->u.ar.as->lower[i]->value.integer);
2297 if (ref->u.ar.end[i])
2299 if (ref->u.ar.end[i]->expr_type == EXPR_CONSTANT)
2300 end = mpz_get_si (ref->u.ar.end[i]->value.integer);
2304 else if (ref->u.ar.as->upper[i]
2305 && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT)
2306 end = mpz_get_si (ref->u.ar.as->upper[i]->value.integer);
2310 elements *= (end - start)/stride + 1L;
2312 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_FULL)
2313 for (i = 0; i < ref->u.ar.as->rank; i++)
2315 if (ref->u.ar.as->lower[i] && ref->u.ar.as->upper[i]
2316 && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT
2317 && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT)
2318 elements *= mpz_get_si (ref->u.ar.as->upper[i]->value.integer)
2319 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer)
2324 else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT
2325 && e->expr_type == EXPR_VARIABLE)
2327 if (ref->u.ar.as->type == AS_ASSUMED_SHAPE
2328 || e->symtree->n.sym->attr.pointer)
2334 /* Determine the number of remaining elements in the element
2335 sequence for array element designators. */
2336 is_str_storage = true;
2337 for (i = ref->u.ar.dimen - 1; i >= 0; i--)
2339 if (ref->u.ar.start[i] == NULL
2340 || ref->u.ar.start[i]->expr_type != EXPR_CONSTANT
2341 || ref->u.ar.as->upper[i] == NULL
2342 || ref->u.ar.as->lower[i] == NULL
2343 || ref->u.ar.as->upper[i]->expr_type != EXPR_CONSTANT
2344 || ref->u.ar.as->lower[i]->expr_type != EXPR_CONSTANT)
2349 * (mpz_get_si (ref->u.ar.as->upper[i]->value.integer)
2350 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer)
2352 - (mpz_get_si (ref->u.ar.start[i]->value.integer)
2353 - mpz_get_si (ref->u.ar.as->lower[i]->value.integer));
2359 return (is_str_storage) ? substrlen + (elements-1)*strlen
2362 return elements*strlen;
2366 /* Given an expression, check whether it is an array section
2367 which has a vector subscript. If it has, one is returned,
2371 gfc_has_vector_subscript (gfc_expr *e)
2376 if (e == NULL || e->rank == 0 || e->expr_type != EXPR_VARIABLE)
2379 for (ref = e->ref; ref; ref = ref->next)
2380 if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION)
2381 for (i = 0; i < ref->u.ar.dimen; i++)
2382 if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
2389 /* Given formal and actual argument lists, see if they are compatible.
2390 If they are compatible, the actual argument list is sorted to
2391 correspond with the formal list, and elements for missing optional
2392 arguments are inserted. If WHERE pointer is nonnull, then we issue
2393 errors when things don't match instead of just returning the status
2397 compare_actual_formal (gfc_actual_arglist **ap, gfc_formal_arglist *formal,
2398 int ranks_must_agree, int is_elemental, locus *where)
2400 gfc_actual_arglist **new_arg, *a, *actual, temp;
2401 gfc_formal_arglist *f;
2403 unsigned long actual_size, formal_size;
2404 bool full_array = false;
2408 if (actual == NULL && formal == NULL)
2412 for (f = formal; f; f = f->next)
2415 new_arg = XALLOCAVEC (gfc_actual_arglist *, n);
2417 for (i = 0; i < n; i++)
2424 for (a = actual; a; a = a->next, f = f->next)
2426 /* Look for keywords but ignore g77 extensions like %VAL. */
2427 if (a->name != NULL && a->name[0] != '%')
2430 for (f = formal; f; f = f->next, i++)
2434 if (strcmp (f->sym->name, a->name) == 0)
2441 gfc_error ("Keyword argument '%s' at %L is not in "
2442 "the procedure", a->name, &a->expr->where);
2446 if (new_arg[i] != NULL)
2449 gfc_error ("Keyword argument '%s' at %L is already associated "
2450 "with another actual argument", a->name,
2459 gfc_error ("More actual than formal arguments in procedure "
2460 "call at %L", where);
2465 if (f->sym == NULL && a->expr == NULL)
2471 gfc_error ("Missing alternate return spec in subroutine call "
2476 if (a->expr == NULL)
2479 gfc_error ("Unexpected alternate return spec in subroutine "
2480 "call at %L", where);
2484 /* Make sure that intrinsic vtables exist for calls to unlimited
2485 polymorphic formal arguments. */
2486 if (UNLIMITED_POLY(f->sym)
2487 && a->expr->ts.type != BT_DERIVED
2488 && a->expr->ts.type != BT_CLASS)
2489 gfc_find_intrinsic_vtab (&a->expr->ts);
2491 if (a->expr->expr_type == EXPR_NULL
2492 && ((f->sym->ts.type != BT_CLASS && !f->sym->attr.pointer
2493 && (f->sym->attr.allocatable || !f->sym->attr.optional
2494 || (gfc_option.allow_std & GFC_STD_F2008) == 0))
2495 || (f->sym->ts.type == BT_CLASS
2496 && !CLASS_DATA (f->sym)->attr.class_pointer
2497 && (CLASS_DATA (f->sym)->attr.allocatable
2498 || !f->sym->attr.optional
2499 || (gfc_option.allow_std & GFC_STD_F2008) == 0))))
2502 && (!f->sym->attr.optional
2503 || (f->sym->ts.type != BT_CLASS && f->sym->attr.allocatable)
2504 || (f->sym->ts.type == BT_CLASS
2505 && CLASS_DATA (f->sym)->attr.allocatable)))
2506 gfc_error ("Unexpected NULL() intrinsic at %L to dummy '%s'",
2507 where, f->sym->name);
2509 gfc_error ("Fortran 2008: Null pointer at %L to non-pointer "
2510 "dummy '%s'", where, f->sym->name);
2515 if (!compare_parameter (f->sym, a->expr, ranks_must_agree,
2516 is_elemental, where))
2519 /* TS 29113, 6.3p2. */
2520 if (f->sym->ts.type == BT_ASSUMED
2521 && (a->expr->ts.type == BT_DERIVED
2522 || (a->expr->ts.type == BT_CLASS && CLASS_DATA (a->expr))))
2524 gfc_namespace *f2k_derived;
2526 f2k_derived = a->expr->ts.type == BT_DERIVED
2527 ? a->expr->ts.u.derived->f2k_derived
2528 : CLASS_DATA (a->expr)->ts.u.derived->f2k_derived;
2531 && (f2k_derived->finalizers || f2k_derived->tb_sym_root))
2533 gfc_error ("Actual argument at %L to assumed-type dummy is of "
2534 "derived type with type-bound or FINAL procedures",
2540 /* Special case for character arguments. For allocatable, pointer
2541 and assumed-shape dummies, the string length needs to match
2543 if (a->expr->ts.type == BT_CHARACTER
2544 && a->expr->ts.u.cl && a->expr->ts.u.cl->length
2545 && a->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT
2546 && f->sym->ts.u.cl && f->sym->ts.u.cl && f->sym->ts.u.cl->length
2547 && f->sym->ts.u.cl->length->expr_type == EXPR_CONSTANT
2548 && (f->sym->attr.pointer || f->sym->attr.allocatable
2549 || (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2550 && (mpz_cmp (a->expr->ts.u.cl->length->value.integer,
2551 f->sym->ts.u.cl->length->value.integer) != 0))
2553 if (where && (f->sym->attr.pointer || f->sym->attr.allocatable))
2554 gfc_warning ("Character length mismatch (%ld/%ld) between actual "
2555 "argument and pointer or allocatable dummy argument "
2557 mpz_get_si (a->expr->ts.u.cl->length->value.integer),
2558 mpz_get_si (f->sym->ts.u.cl->length->value.integer),
2559 f->sym->name, &a->expr->where);
2561 gfc_warning ("Character length mismatch (%ld/%ld) between actual "
2562 "argument and assumed-shape dummy argument '%s' "
2564 mpz_get_si (a->expr->ts.u.cl->length->value.integer),
2565 mpz_get_si (f->sym->ts.u.cl->length->value.integer),
2566 f->sym->name, &a->expr->where);
2570 if ((f->sym->attr.pointer || f->sym->attr.allocatable)
2571 && f->sym->ts.deferred != a->expr->ts.deferred
2572 && a->expr->ts.type == BT_CHARACTER)
2575 gfc_error ("Actual argument at %L to allocatable or "
2576 "pointer dummy argument '%s' must have a deferred "
2577 "length type parameter if and only if the dummy has one",
2578 &a->expr->where, f->sym->name);
2582 if (f->sym->ts.type == BT_CLASS)
2583 goto skip_size_check;
2585 actual_size = get_expr_storage_size (a->expr);
2586 formal_size = get_sym_storage_size (f->sym);
2587 if (actual_size != 0 && actual_size < formal_size
2588 && a->expr->ts.type != BT_PROCEDURE
2589 && f->sym->attr.flavor != FL_PROCEDURE)
2591 if (a->expr->ts.type == BT_CHARACTER && !f->sym->as && where)
2592 gfc_warning ("Character length of actual argument shorter "
2593 "than of dummy argument '%s' (%lu/%lu) at %L",
2594 f->sym->name, actual_size, formal_size,
2597 gfc_warning ("Actual argument contains too few "
2598 "elements for dummy argument '%s' (%lu/%lu) at %L",
2599 f->sym->name, actual_size, formal_size,
2606 /* Satisfy F03:12.4.1.3 by ensuring that a procedure pointer actual
2607 argument is provided for a procedure pointer formal argument. */
2608 if (f->sym->attr.proc_pointer
2609 && !((a->expr->expr_type == EXPR_VARIABLE
2610 && a->expr->symtree->n.sym->attr.proc_pointer)
2611 || (a->expr->expr_type == EXPR_FUNCTION
2612 && a->expr->symtree->n.sym->result->attr.proc_pointer)
2613 || gfc_is_proc_ptr_comp (a->expr)))
2616 gfc_error ("Expected a procedure pointer for argument '%s' at %L",
2617 f->sym->name, &a->expr->where);
2621 /* Satisfy F03:12.4.1.3 by ensuring that a procedure actual argument is
2622 provided for a procedure formal argument. */
2623 if (f->sym->attr.flavor == FL_PROCEDURE
2624 && gfc_expr_attr (a->expr).flavor != FL_PROCEDURE)
2627 gfc_error ("Expected a procedure for argument '%s' at %L",
2628 f->sym->name, &a->expr->where);
2632 if (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE
2633 && a->expr->expr_type == EXPR_VARIABLE
2634 && a->expr->symtree->n.sym->as
2635 && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SIZE
2636 && (a->expr->ref == NULL
2637 || (a->expr->ref->type == REF_ARRAY
2638 && a->expr->ref->u.ar.type == AR_FULL)))
2641 gfc_error ("Actual argument for '%s' cannot be an assumed-size"
2642 " array at %L", f->sym->name, where);
2646 if (a->expr->expr_type != EXPR_NULL
2647 && compare_pointer (f->sym, a->expr) == 0)
2650 gfc_error ("Actual argument for '%s' must be a pointer at %L",
2651 f->sym->name, &a->expr->where);
2655 if (a->expr->expr_type != EXPR_NULL
2656 && (gfc_option.allow_std & GFC_STD_F2008) == 0
2657 && compare_pointer (f->sym, a->expr) == 2)
2660 gfc_error ("Fortran 2008: Non-pointer actual argument at %L to "
2661 "pointer dummy '%s'", &a->expr->where,f->sym->name);
2666 /* Fortran 2008, C1242. */
2667 if (f->sym->attr.pointer && gfc_is_coindexed (a->expr))
2670 gfc_error ("Coindexed actual argument at %L to pointer "
2672 &a->expr->where, f->sym->name);
2676 /* Fortran 2008, 12.5.2.5 (no constraint). */
2677 if (a->expr->expr_type == EXPR_VARIABLE
2678 && f->sym->attr.intent != INTENT_IN
2679 && f->sym->attr.allocatable
2680 && gfc_is_coindexed (a->expr))
2683 gfc_error ("Coindexed actual argument at %L to allocatable "
2684 "dummy '%s' requires INTENT(IN)",
2685 &a->expr->where, f->sym->name);
2689 /* Fortran 2008, C1237. */
2690 if (a->expr->expr_type == EXPR_VARIABLE
2691 && (f->sym->attr.asynchronous || f->sym->attr.volatile_)
2692 && gfc_is_coindexed (a->expr)
2693 && (a->expr->symtree->n.sym->attr.volatile_
2694 || a->expr->symtree->n.sym->attr.asynchronous))
2697 gfc_error ("Coindexed ASYNCHRONOUS or VOLATILE actual argument at "
2698 "%L requires that dummy '%s' has neither "
2699 "ASYNCHRONOUS nor VOLATILE", &a->expr->where,
2704 /* Fortran 2008, 12.5.2.4 (no constraint). */
2705 if (a->expr->expr_type == EXPR_VARIABLE
2706 && f->sym->attr.intent != INTENT_IN && !f->sym->attr.value
2707 && gfc_is_coindexed (a->expr)
2708 && gfc_has_ultimate_allocatable (a->expr))
2711 gfc_error ("Coindexed actual argument at %L with allocatable "
2712 "ultimate component to dummy '%s' requires either VALUE "
2713 "or INTENT(IN)", &a->expr->where, f->sym->name);
2717 if (f->sym->ts.type == BT_CLASS
2718 && CLASS_DATA (f->sym)->attr.allocatable
2719 && gfc_is_class_array_ref (a->expr, &full_array)
2723 gfc_error ("Actual CLASS array argument for '%s' must be a full "
2724 "array at %L", f->sym->name, &a->expr->where);
2729 if (a->expr->expr_type != EXPR_NULL
2730 && compare_allocatable (f->sym, a->expr) == 0)
2733 gfc_error ("Actual argument for '%s' must be ALLOCATABLE at %L",
2734 f->sym->name, &a->expr->where);
2738 /* Check intent = OUT/INOUT for definable actual argument. */
2739 if ((f->sym->attr.intent == INTENT_OUT
2740 || f->sym->attr.intent == INTENT_INOUT))
2742 const char* context = (where
2743 ? _("actual argument to INTENT = OUT/INOUT")
2746 if (((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
2747 && CLASS_DATA (f->sym)->attr.class_pointer)
2748 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
2749 && gfc_check_vardef_context (a->expr, true, false, false, context)
2752 if (gfc_check_vardef_context (a->expr, false, false, false, context)
2757 if ((f->sym->attr.intent == INTENT_OUT
2758 || f->sym->attr.intent == INTENT_INOUT
2759 || f->sym->attr.volatile_
2760 || f->sym->attr.asynchronous)
2761 && gfc_has_vector_subscript (a->expr))
2764 gfc_error ("Array-section actual argument with vector "
2765 "subscripts at %L is incompatible with INTENT(OUT), "
2766 "INTENT(INOUT), VOLATILE or ASYNCHRONOUS attribute "
2767 "of the dummy argument '%s'",
2768 &a->expr->where, f->sym->name);
2772 /* C1232 (R1221) For an actual argument which is an array section or
2773 an assumed-shape array, the dummy argument shall be an assumed-
2774 shape array, if the dummy argument has the VOLATILE attribute. */
2776 if (f->sym->attr.volatile_
2777 && a->expr->symtree->n.sym->as
2778 && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SHAPE
2779 && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2782 gfc_error ("Assumed-shape actual argument at %L is "
2783 "incompatible with the non-assumed-shape "
2784 "dummy argument '%s' due to VOLATILE attribute",
2785 &a->expr->where,f->sym->name);
2789 if (f->sym->attr.volatile_
2790 && a->expr->ref && a->expr->ref->u.ar.type == AR_SECTION
2791 && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE))
2794 gfc_error ("Array-section actual argument at %L is "
2795 "incompatible with the non-assumed-shape "
2796 "dummy argument '%s' due to VOLATILE attribute",
2797 &a->expr->where,f->sym->name);
2801 /* C1233 (R1221) For an actual argument which is a pointer array, the
2802 dummy argument shall be an assumed-shape or pointer array, if the
2803 dummy argument has the VOLATILE attribute. */
2805 if (f->sym->attr.volatile_
2806 && a->expr->symtree->n.sym->attr.pointer
2807 && a->expr->symtree->n.sym->as
2809 && (f->sym->as->type == AS_ASSUMED_SHAPE
2810 || f->sym->attr.pointer)))
2813 gfc_error ("Pointer-array actual argument at %L requires "
2814 "an assumed-shape or pointer-array dummy "
2815 "argument '%s' due to VOLATILE attribute",
2816 &a->expr->where,f->sym->name);
2827 /* Make sure missing actual arguments are optional. */
2829 for (f = formal; f; f = f->next, i++)
2831 if (new_arg[i] != NULL)
2836 gfc_error ("Missing alternate return spec in subroutine call "
2840 if (!f->sym->attr.optional)
2843 gfc_error ("Missing actual argument for argument '%s' at %L",
2844 f->sym->name, where);
2849 /* The argument lists are compatible. We now relink a new actual
2850 argument list with null arguments in the right places. The head
2851 of the list remains the head. */
2852 for (i = 0; i < n; i++)
2853 if (new_arg[i] == NULL)
2854 new_arg[i] = gfc_get_actual_arglist ();
2859 *new_arg[0] = *actual;
2863 new_arg[0] = new_arg[na];
2867 for (i = 0; i < n - 1; i++)
2868 new_arg[i]->next = new_arg[i + 1];
2870 new_arg[i]->next = NULL;
2872 if (*ap == NULL && n > 0)
2875 /* Note the types of omitted optional arguments. */
2876 for (a = *ap, f = formal; a; a = a->next, f = f->next)
2877 if (a->expr == NULL && a->label == NULL)
2878 a->missing_arg_type = f->sym->ts.type;
2886 gfc_formal_arglist *f;
2887 gfc_actual_arglist *a;
2891 /* qsort comparison function for argument pairs, with the following
2893 - p->a->expr == NULL
2894 - p->a->expr->expr_type != EXPR_VARIABLE
2895 - growing p->a->expr->symbol. */
2898 pair_cmp (const void *p1, const void *p2)
2900 const gfc_actual_arglist *a1, *a2;
2902 /* *p1 and *p2 are elements of the to-be-sorted array. */
2903 a1 = ((const argpair *) p1)->a;
2904 a2 = ((const argpair *) p2)->a;
2913 if (a1->expr->expr_type != EXPR_VARIABLE)
2915 if (a2->expr->expr_type != EXPR_VARIABLE)
2919 if (a2->expr->expr_type != EXPR_VARIABLE)
2921 return a1->expr->symtree->n.sym < a2->expr->symtree->n.sym;
2925 /* Given two expressions from some actual arguments, test whether they
2926 refer to the same expression. The analysis is conservative.
2927 Returning FAILURE will produce no warning. */
2930 compare_actual_expr (gfc_expr *e1, gfc_expr *e2)
2932 const gfc_ref *r1, *r2;
2935 || e1->expr_type != EXPR_VARIABLE
2936 || e2->expr_type != EXPR_VARIABLE
2937 || e1->symtree->n.sym != e2->symtree->n.sym)
2940 /* TODO: improve comparison, see expr.c:show_ref(). */
2941 for (r1 = e1->ref, r2 = e2->ref; r1 && r2; r1 = r1->next, r2 = r2->next)
2943 if (r1->type != r2->type)
2948 if (r1->u.ar.type != r2->u.ar.type)
2950 /* TODO: At the moment, consider only full arrays;
2951 we could do better. */
2952 if (r1->u.ar.type != AR_FULL || r2->u.ar.type != AR_FULL)
2957 if (r1->u.c.component != r2->u.c.component)
2965 gfc_internal_error ("compare_actual_expr(): Bad component code");
2974 /* Given formal and actual argument lists that correspond to one
2975 another, check that identical actual arguments aren't not
2976 associated with some incompatible INTENTs. */
2979 check_some_aliasing (gfc_formal_arglist *f, gfc_actual_arglist *a)
2981 sym_intent f1_intent, f2_intent;
2982 gfc_formal_arglist *f1;
2983 gfc_actual_arglist *a1;
2986 gfc_try t = SUCCESS;
2989 for (f1 = f, a1 = a;; f1 = f1->next, a1 = a1->next)
2991 if (f1 == NULL && a1 == NULL)
2993 if (f1 == NULL || a1 == NULL)
2994 gfc_internal_error ("check_some_aliasing(): List mismatch");
2999 p = XALLOCAVEC (argpair, n);
3001 for (i = 0, f1 = f, a1 = a; i < n; i++, f1 = f1->next, a1 = a1->next)
3007 qsort (p, n, sizeof (argpair), pair_cmp);
3009 for (i = 0; i < n; i++)
3012 || p[i].a->expr->expr_type != EXPR_VARIABLE
3013 || p[i].a->expr->ts.type == BT_PROCEDURE)
3015 f1_intent = p[i].f->sym->attr.intent;
3016 for (j = i + 1; j < n; j++)
3018 /* Expected order after the sort. */
3019 if (!p[j].a->expr || p[j].a->expr->expr_type != EXPR_VARIABLE)
3020 gfc_internal_error ("check_some_aliasing(): corrupted data");
3022 /* Are the expression the same? */
3023 if (compare_actual_expr (p[i].a->expr, p[j].a->expr) == FAILURE)
3025 f2_intent = p[j].f->sym->attr.intent;
3026 if ((f1_intent == INTENT_IN && f2_intent == INTENT_OUT)
3027 || (f1_intent == INTENT_OUT && f2_intent == INTENT_IN))
3029 gfc_warning ("Same actual argument associated with INTENT(%s) "
3030 "argument '%s' and INTENT(%s) argument '%s' at %L",
3031 gfc_intent_string (f1_intent), p[i].f->sym->name,
3032 gfc_intent_string (f2_intent), p[j].f->sym->name,
3033 &p[i].a->expr->where);
3043 /* Given formal and actual argument lists that correspond to one
3044 another, check that they are compatible in the sense that intents
3045 are not mismatched. */
3048 check_intents (gfc_formal_arglist *f, gfc_actual_arglist *a)
3050 sym_intent f_intent;
3052 for (;; f = f->next, a = a->next)
3054 if (f == NULL && a == NULL)
3056 if (f == NULL || a == NULL)
3057 gfc_internal_error ("check_intents(): List mismatch");
3059 if (a->expr == NULL || a->expr->expr_type != EXPR_VARIABLE)
3062 f_intent = f->sym->attr.intent;
3064 if (gfc_pure (NULL) && gfc_impure_variable (a->expr->symtree->n.sym))
3066 if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
3067 && CLASS_DATA (f->sym)->attr.class_pointer)
3068 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
3070 gfc_error ("Procedure argument at %L is local to a PURE "
3071 "procedure and has the POINTER attribute",
3077 /* Fortran 2008, C1283. */
3078 if (gfc_pure (NULL) && gfc_is_coindexed (a->expr))
3080 if (f_intent == INTENT_INOUT || f_intent == INTENT_OUT)
3082 gfc_error ("Coindexed actual argument at %L in PURE procedure "
3083 "is passed to an INTENT(%s) argument",
3084 &a->expr->where, gfc_intent_string (f_intent));
3088 if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok
3089 && CLASS_DATA (f->sym)->attr.class_pointer)
3090 || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer))
3092 gfc_error ("Coindexed actual argument at %L in PURE procedure "
3093 "is passed to a POINTER dummy argument",
3099 /* F2008, Section 12.5.2.4. */
3100 if (a->expr->ts.type == BT_CLASS && f->sym->ts.type == BT_CLASS
3101 && gfc_is_coindexed (a->expr))
3103 gfc_error ("Coindexed polymorphic actual argument at %L is passed "
3104 "polymorphic dummy argument '%s'",
3105 &a->expr->where, f->sym->name);
3114 /* Check how a procedure is used against its interface. If all goes
3115 well, the actual argument list will also end up being properly
3119 gfc_procedure_use (gfc_symbol *sym, gfc_actual_arglist **ap, locus *where)
3121 gfc_formal_arglist *dummy_args;
3123 /* Warn about calls with an implicit interface. Special case
3124 for calling a ISO_C_BINDING becase c_loc and c_funloc
3125 are pseudo-unknown. Additionally, warn about procedures not
3126 explicitly declared at all if requested. */
3127 if (sym->attr.if_source == IFSRC_UNKNOWN && ! sym->attr.is_iso_c)
3129 if (gfc_option.warn_implicit_interface)
3130 gfc_warning ("Procedure '%s' called with an implicit interface at %L",
3132 else if (gfc_option.warn_implicit_procedure
3133 && sym->attr.proc == PROC_UNKNOWN)
3134 gfc_warning ("Procedure '%s' called at %L is not explicitly declared",
3138 if (sym->attr.if_source == IFSRC_UNKNOWN)
3140 gfc_actual_arglist *a;
3142 if (sym->attr.pointer)
3144 gfc_error("The pointer object '%s' at %L must have an explicit "
3145 "function interface or be declared as array",
3150 if (sym->attr.allocatable && !sym->attr.external)
3152 gfc_error("The allocatable object '%s' at %L must have an explicit "
3153 "function interface or be declared as array",
3158 if (sym->attr.allocatable)
3160 gfc_error("Allocatable function '%s' at %L must have an explicit "
3161 "function interface", sym->name, where);
3165 for (a = *ap; a; a = a->next)
3167 /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */
3168 if (a->name != NULL && a->name[0] != '%')
3170 gfc_error("Keyword argument requires explicit interface "
3171 "for procedure '%s' at %L", sym->name, &a->expr->where);
3175 /* TS 29113, 6.2. */
3176 if (a->expr && a->expr->ts.type == BT_ASSUMED
3177 && sym->intmod_sym_id != ISOCBINDING_LOC)
3179 gfc_error ("Assumed-type argument %s at %L requires an explicit "
3180 "interface", a->expr->symtree->n.sym->name,
3185 /* F2008, C1303 and C1304. */
3187 && (a->expr->ts.type == BT_DERIVED || a->expr->ts.type == BT_CLASS)
3188 && ((a->expr->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV
3189 && a->expr->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE)
3190 || gfc_expr_attr (a->expr).lock_comp))
3192 gfc_error("Actual argument of LOCK_TYPE or with LOCK_TYPE "
3193 "component at %L requires an explicit interface for "
3194 "procedure '%s'", &a->expr->where, sym->name);
3198 if (a->expr && a->expr->expr_type == EXPR_NULL
3199 && a->expr->ts.type == BT_UNKNOWN)
3201 gfc_error ("MOLD argument to NULL required at %L", &a->expr->where);
3205 /* TS 29113, C407b. */
3206 if (a->expr && a->expr->expr_type == EXPR_VARIABLE
3207 && symbol_rank (a->expr->symtree->n.sym) == -1)
3209 gfc_error ("Assumed-rank argument requires an explicit interface "
3210 "at %L", &a->expr->where);
3218 dummy_args = gfc_sym_get_dummy_args (sym);
3220 if (!compare_actual_formal (ap, dummy_args, 0, sym->attr.elemental, where))
3223 if (check_intents (dummy_args, *ap) == FAILURE)
3226 if (gfc_option.warn_aliasing)
3227 check_some_aliasing (dummy_args, *ap);
3233 /* Check how a procedure pointer component is used against its interface.
3234 If all goes well, the actual argument list will also end up being properly
3235 sorted. Completely analogous to gfc_procedure_use. */
3238 gfc_ppc_use (gfc_component *comp, gfc_actual_arglist **ap, locus *where)
3240 /* Warn about calls with an implicit interface. Special case
3241 for calling a ISO_C_BINDING becase c_loc and c_funloc
3242 are pseudo-unknown. */
3243 if (gfc_option.warn_implicit_interface
3244 && comp->attr.if_source == IFSRC_UNKNOWN
3245 && !comp->attr.is_iso_c)
3246 gfc_warning ("Procedure pointer component '%s' called with an implicit "
3247 "interface at %L", comp->name, where);
3249 if (comp->attr.if_source == IFSRC_UNKNOWN)
3251 gfc_actual_arglist *a;
3252 for (a = *ap; a; a = a->next)
3254 /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */
3255 if (a->name != NULL && a->name[0] != '%')
3257 gfc_error("Keyword argument requires explicit interface "
3258 "for procedure pointer component '%s' at %L",
3259 comp->name, &a->expr->where);
3267 if (!compare_actual_formal (ap, comp->ts.interface->formal, 0,
3268 comp->attr.elemental, where))
3271 check_intents (comp->ts.interface->formal, *ap);
3272 if (gfc_option.warn_aliasing)
3273 check_some_aliasing (comp->ts.interface->formal, *ap);
3277 /* Try if an actual argument list matches the formal list of a symbol,
3278 respecting the symbol's attributes like ELEMENTAL. This is used for
3279 GENERIC resolution. */
3282 gfc_arglist_matches_symbol (gfc_actual_arglist** args, gfc_symbol* sym)
3284 gfc_formal_arglist *dummy_args;
3287 gcc_assert (sym->attr.flavor == FL_PROCEDURE);
3289 dummy_args = gfc_sym_get_dummy_args (sym);
3291 r = !sym->attr.elemental;
3292 if (compare_actual_formal (args, dummy_args, r, !r, NULL))
3294 check_intents (dummy_args, *args);
3295 if (gfc_option.warn_aliasing)
3296 check_some_aliasing (dummy_args, *args);
3304 /* Given an interface pointer and an actual argument list, search for
3305 a formal argument list that matches the actual. If found, returns
3306 a pointer to the symbol of the correct interface. Returns NULL if
3310 gfc_search_interface (gfc_interface *intr, int sub_flag,
3311 gfc_actual_arglist **ap)
3313 gfc_symbol *elem_sym = NULL;
3314 gfc_symbol *null_sym = NULL;
3315 locus null_expr_loc;
3316 gfc_actual_arglist *a;
3317 bool has_null_arg = false;
3319 for (a = *ap; a; a = a->next)
3320 if (a->expr && a->expr->expr_type == EXPR_NULL
3321 && a->expr->ts.type == BT_UNKNOWN)
3323 has_null_arg = true;
3324 null_expr_loc = a->expr->where;
3328 for (; intr; intr = intr->next)
3330 if (intr->sym->attr.flavor == FL_DERIVED)
3332 if (sub_flag && intr->sym->attr.function)
3334 if (!sub_flag && intr->sym->attr.subroutine)
3337 if (gfc_arglist_matches_symbol (ap, intr->sym))
3339 if (has_null_arg && null_sym)
3341 gfc_error ("MOLD= required in NULL() argument at %L: Ambiguity "
3342 "between specific functions %s and %s",
3343 &null_expr_loc, null_sym->name, intr->sym->name);
3346 else if (has_null_arg)
3348 null_sym = intr->sym;
3352 /* Satisfy 12.4.4.1 such that an elemental match has lower
3353 weight than a non-elemental match. */
3354 if (intr->sym->attr.elemental)
3356 elem_sym = intr->sym;
3366 return elem_sym ? elem_sym : NULL;
3370 /* Do a brute force recursive search for a symbol. */
3372 static gfc_symtree *
3373 find_symtree0 (gfc_symtree *root, gfc_symbol *sym)
3377 if (root->n.sym == sym)
3382 st = find_symtree0 (root->left, sym);
3383 if (root->right && ! st)
3384 st = find_symtree0 (root->right, sym);
3389 /* Find a symtree for a symbol. */
3392 gfc_find_sym_in_symtree (gfc_symbol *sym)
3397 /* First try to find it by name. */
3398 gfc_find_sym_tree (sym->name, gfc_current_ns, 1, &st);
3399 if (st && st->n.sym == sym)
3402 /* If it's been renamed, resort to a brute-force search. */
3403 /* TODO: avoid having to do this search. If the symbol doesn't exist
3404 in the symtree for the current namespace, it should probably be added. */
3405 for (ns = gfc_current_ns; ns; ns = ns->parent)
3407 st = find_symtree0 (ns->sym_root, sym);
3411 gfc_internal_error ("Unable to find symbol %s", sym->name);
3416 /* See if the arglist to an operator-call contains a derived-type argument
3417 with a matching type-bound operator. If so, return the matching specific
3418 procedure defined as operator-target as well as the base-object to use
3419 (which is the found derived-type argument with operator). The generic
3420 name, if any, is transmitted to the final expression via 'gname'. */
3422 static gfc_typebound_proc*
3423 matching_typebound_op (gfc_expr** tb_base,
3424 gfc_actual_arglist* args,
3425 gfc_intrinsic_op op, const char* uop,
3426 const char ** gname)
3428 gfc_actual_arglist* base;
3430 for (base = args; base; base = base->next)
3431 if (base->expr->ts.type == BT_DERIVED || base->expr->ts.type == BT_CLASS)
3433 gfc_typebound_proc* tb;
3434 gfc_symbol* derived;
3437 while (base->expr->expr_type == EXPR_OP
3438 && base->expr->value.op.op == INTRINSIC_PARENTHESES)
3439 base->expr = base->expr->value.op.op1;
3441 if (base->expr->ts.type == BT_CLASS)
3443 if (CLASS_DATA (base->expr) == NULL
3444 || !gfc_expr_attr (base->expr).class_ok)
3446 derived = CLASS_DATA (base->expr)->ts.u.derived;
3449 derived = base->expr->ts.u.derived;
3451 if (op == INTRINSIC_USER)
3453 gfc_symtree* tb_uop;
3456 tb_uop = gfc_find_typebound_user_op (derived, &result, uop,
3465 tb = gfc_find_typebound_intrinsic_op (derived, &result, op,
3468 /* This means we hit a PRIVATE operator which is use-associated and
3469 should thus not be seen. */
3470 if (result == FAILURE)
3473 /* Look through the super-type hierarchy for a matching specific
3475 for (; tb; tb = tb->overridden)
3479 gcc_assert (tb->is_generic);
3480 for (g = tb->u.generic; g; g = g->next)
3483 gfc_actual_arglist* argcopy;
3486 gcc_assert (g->specific);
3487 if (g->specific->error)
3490 target = g->specific->u.specific->n.sym;
3492 /* Check if this arglist matches the formal. */
3493 argcopy = gfc_copy_actual_arglist (args);
3494 matches = gfc_arglist_matches_symbol (&argcopy, target);
3495 gfc_free_actual_arglist (argcopy);
3497 /* Return if we found a match. */
3500 *tb_base = base->expr;
3501 *gname = g->specific_st->name;
3512 /* For the 'actual arglist' of an operator call and a specific typebound
3513 procedure that has been found the target of a type-bound operator, build the
3514 appropriate EXPR_COMPCALL and resolve it. We take this indirection over
3515 type-bound procedures rather than resolving type-bound operators 'directly'
3516 so that we can reuse the existing logic. */
3519 build_compcall_for_operator (gfc_expr* e, gfc_actual_arglist* actual,
3520 gfc_expr* base, gfc_typebound_proc* target,
3523 e->expr_type = EXPR_COMPCALL;
3524 e->value.compcall.tbp = target;
3525 e->value.compcall.name = gname ? gname : "$op";
3526 e->value.compcall.actual = actual;
3527 e->value.compcall.base_object = base;
3528 e->value.compcall.ignore_pass = 1;
3529 e->value.compcall.assign = 0;
3530 if (e->ts.type == BT_UNKNOWN
3531 && target->function)
3533 if (target->is_generic)
3534 e->ts = target->u.generic->specific->u.specific->n.sym->ts;
3536 e->ts = target->u.specific->n.sym->ts;
3541 /* This subroutine is called when an expression is being resolved.
3542 The expression node in question is either a user defined operator
3543 or an intrinsic operator with arguments that aren't compatible
3544 with the operator. This subroutine builds an actual argument list
3545 corresponding to the operands, then searches for a compatible
3546 interface. If one is found, the expression node is replaced with
3547 the appropriate function call. We use the 'match' enum to specify
3548 whether a replacement has been made or not, or if an error occurred. */
3551 gfc_extend_expr (gfc_expr *e)
3553 gfc_actual_arglist *actual;
3562 actual = gfc_get_actual_arglist ();
3563 actual->expr = e->value.op.op1;
3567 if (e->value.op.op2 != NULL)
3569 actual->next = gfc_get_actual_arglist ();
3570 actual->next->expr = e->value.op.op2;
3573 i = fold_unary_intrinsic (e->value.op.op);
3575 if (i == INTRINSIC_USER)
3577 for (ns = gfc_current_ns; ns; ns = ns->parent)
3579 uop = gfc_find_uop (e->value.op.uop->name, ns);
3583 sym = gfc_search_interface (uop->op, 0, &actual);
3590 for (ns = gfc_current_ns; ns; ns = ns->parent)
3592 /* Due to the distinction between '==' and '.eq.' and friends, one has
3593 to check if either is defined. */
3596 #define CHECK_OS_COMPARISON(comp) \
3597 case INTRINSIC_##comp: \
3598 case INTRINSIC_##comp##_OS: \
3599 sym = gfc_search_interface (ns->op[INTRINSIC_##comp], 0, &actual); \
3601 sym = gfc_search_interface (ns->op[INTRINSIC_##comp##_OS], 0, &actual); \
3603 CHECK_OS_COMPARISON(EQ)
3604 CHECK_OS_COMPARISON(NE)
3605 CHECK_OS_COMPARISON(GT)
3606 CHECK_OS_COMPARISON(GE)
3607 CHECK_OS_COMPARISON(LT)
3608 CHECK_OS_COMPARISON(LE)
3609 #undef CHECK_OS_COMPARISON
3612 sym = gfc_search_interface (ns->op[i], 0, &actual);
3620 /* TODO: Do an ambiguity-check and error if multiple matching interfaces are
3621 found rather than just taking the first one and not checking further. */
3625 gfc_typebound_proc* tbo;
3628 /* See if we find a matching type-bound operator. */
3629 if (i == INTRINSIC_USER)
3630 tbo = matching_typebound_op (&tb_base, actual,
3631 i, e->value.op.uop->name, &gname);
3635 #define CHECK_OS_COMPARISON(comp) \
3636 case INTRINSIC_##comp: \
3637 case INTRINSIC_##comp##_OS: \
3638 tbo = matching_typebound_op (&tb_base, actual, \
3639 INTRINSIC_##comp, NULL, &gname); \
3641 tbo = matching_typebound_op (&tb_base, actual, \
3642 INTRINSIC_##comp##_OS, NULL, &gname); \
3644 CHECK_OS_COMPARISON(EQ)
3645 CHECK_OS_COMPARISON(NE)
3646 CHECK_OS_COMPARISON(GT)
3647 CHECK_OS_COMPARISON(GE)
3648 CHECK_OS_COMPARISON(LT)
3649 CHECK_OS_COMPARISON(LE)
3650 #undef CHECK_OS_COMPARISON
3653 tbo = matching_typebound_op (&tb_base, actual, i, NULL, &gname);
3657 /* If there is a matching typebound-operator, replace the expression with
3658 a call to it and succeed. */
3663 gcc_assert (tb_base);
3664 build_compcall_for_operator (e, actual, tb_base, tbo, gname);
3666 result = gfc_resolve_expr (e);
3667 if (result == FAILURE)
3673 /* Don't use gfc_free_actual_arglist(). */
3674 free (actual->next);
3680 /* Change the expression node to a function call. */
3681 e->expr_type = EXPR_FUNCTION;
3682 e->symtree = gfc_find_sym_in_symtree (sym);
3683 e->value.function.actual = actual;
3684 e->value.function.esym = NULL;
3685 e->value.function.isym = NULL;
3686 e->value.function.name = NULL;
3687 e->user_operator = 1;
3689 if (gfc_resolve_expr (e) == FAILURE)
3696 /* Tries to replace an assignment code node with a subroutine call to
3697 the subroutine associated with the assignment operator. Return
3698 SUCCESS if the node was replaced. On FAILURE, no error is
3702 gfc_extend_assign (gfc_code *c, gfc_namespace *ns)
3704 gfc_actual_arglist *actual;
3705 gfc_expr *lhs, *rhs;
3714 /* Don't allow an intrinsic assignment to be replaced. */
3715 if (lhs->ts.type != BT_DERIVED && lhs->ts.type != BT_CLASS
3716 && (rhs->rank == 0 || rhs->rank == lhs->rank)
3717 && (lhs->ts.type == rhs->ts.type
3718 || (gfc_numeric_ts (&lhs->ts) && gfc_numeric_ts (&rhs->ts))))
3721 actual = gfc_get_actual_arglist ();
3724 actual->next = gfc_get_actual_arglist ();
3725 actual->next->expr = rhs;
3729 for (; ns; ns = ns->parent)
3731 sym = gfc_search_interface (ns->op[INTRINSIC_ASSIGN], 1, &actual);
3736 /* TODO: Ambiguity-check, see above for gfc_extend_expr. */
3740 gfc_typebound_proc* tbo;
3743 /* See if we find a matching type-bound assignment. */
3744 tbo = matching_typebound_op (&tb_base, actual,
3745 INTRINSIC_ASSIGN, NULL, &gname);
3747 /* If there is one, replace the expression with a call to it and
3751 gcc_assert (tb_base);
3752 c->expr1 = gfc_get_expr ();
3753 build_compcall_for_operator (c->expr1, actual, tb_base, tbo, gname);
3754 c->expr1->value.compcall.assign = 1;
3755 c->expr1->where = c->loc;
3757 c->op = EXEC_COMPCALL;
3759 /* c is resolved from the caller, so no need to do it here. */
3764 free (actual->next);
3769 /* Replace the assignment with the call. */
3770 c->op = EXEC_ASSIGN_CALL;
3771 c->symtree = gfc_find_sym_in_symtree (sym);
3774 c->ext.actual = actual;
3780 /* Make sure that the interface just parsed is not already present in
3781 the given interface list. Ambiguity isn't checked yet since module
3782 procedures can be present without interfaces. */
3785 gfc_check_new_interface (gfc_interface *base, gfc_symbol *new_sym, locus loc)
3789 for (ip = base; ip; ip = ip->next)
3791 if (ip->sym == new_sym)
3793 gfc_error ("Entity '%s' at %L is already present in the interface",
3794 new_sym->name, &loc);
3803 /* Add a symbol to the current interface. */
3806 gfc_add_interface (gfc_symbol *new_sym)
3808 gfc_interface **head, *intr;
3812 switch (current_interface.type)
3814 case INTERFACE_NAMELESS:
3815 case INTERFACE_ABSTRACT:
3818 case INTERFACE_INTRINSIC_OP:
3819 for (ns = current_interface.ns; ns; ns = ns->parent)
3820 switch (current_interface.op)
3823 case INTRINSIC_EQ_OS:
3824 if (gfc_check_new_interface (ns->op[INTRINSIC_EQ], new_sym,
3825 gfc_current_locus) == FAILURE
3826 || gfc_check_new_interface (ns->op[INTRINSIC_EQ_OS], new_sym,
3827 gfc_current_locus) == FAILURE)
3832 case INTRINSIC_NE_OS:
3833 if (gfc_check_new_interface (ns->op[INTRINSIC_NE], new_sym,
3834 gfc_current_locus) == FAILURE
3835 || gfc_check_new_interface (ns->op[INTRINSIC_NE_OS], new_sym,
3836 gfc_current_locus) == FAILURE)
3841 case INTRINSIC_GT_OS:
3842 if (gfc_check_new_interface (ns->op[INTRINSIC_GT], new_sym,
3843 gfc_current_locus) == FAILURE
3844 || gfc_check_new_interface (ns->op[INTRINSIC_GT_OS], new_sym,
3845 gfc_current_locus) == FAILURE)
3850 case INTRINSIC_GE_OS:
3851 if (gfc_check_new_interface (ns->op[INTRINSIC_GE], new_sym,
3852 gfc_current_locus) == FAILURE
3853 || gfc_check_new_interface (ns->op[INTRINSIC_GE_OS], new_sym,
3854 gfc_current_locus) == FAILURE)
3859 case INTRINSIC_LT_OS:
3860 if (gfc_check_new_interface (ns->op[INTRINSIC_LT], new_sym,
3861 gfc_current_locus) == FAILURE
3862 || gfc_check_new_interface (ns->op[INTRINSIC_LT_OS], new_sym,
3863 gfc_current_locus) == FAILURE)
3868 case INTRINSIC_LE_OS:
3869 if (gfc_check_new_interface (ns->op[INTRINSIC_LE], new_sym,
3870 gfc_current_locus) == FAILURE
3871 || gfc_check_new_interface (ns->op[INTRINSIC_LE_OS], new_sym,
3872 gfc_current_locus) == FAILURE)
3877 if (gfc_check_new_interface (ns->op[current_interface.op], new_sym,
3878 gfc_current_locus) == FAILURE)
3882 head = ¤t_interface.ns->op[current_interface.op];
3885 case INTERFACE_GENERIC:
3886 for (ns = current_interface.ns; ns; ns = ns->parent)
3888 gfc_find_symbol (current_interface.sym->name, ns, 0, &sym);
3892 if (gfc_check_new_interface (sym->generic, new_sym, gfc_current_locus)
3897 head = ¤t_interface.sym->generic;
3900 case INTERFACE_USER_OP:
3901 if (gfc_check_new_interface (current_interface.uop->op, new_sym,
3902 gfc_current_locus) == FAILURE)
3905 head = ¤t_interface.uop->op;
3909 gfc_internal_error ("gfc_add_interface(): Bad interface type");
3912 intr = gfc_get_interface ();
3913 intr->sym = new_sym;
3914 intr->where = gfc_current_locus;
3924 gfc_current_interface_head (void)
3926 switch (current_interface.type)
3928 case INTERFACE_INTRINSIC_OP:
3929 return current_interface.ns->op[current_interface.op];
3932 case INTERFACE_GENERIC:
3933 return current_interface.sym->generic;
3936 case INTERFACE_USER_OP:
3937 return current_interface.uop->op;
3947 gfc_set_current_interface_head (gfc_interface *i)
3949 switch (current_interface.type)
3951 case INTERFACE_INTRINSIC_OP:
3952 current_interface.ns->op[current_interface.op] = i;
3955 case INTERFACE_GENERIC:
3956 current_interface.sym->generic = i;
3959 case INTERFACE_USER_OP:
3960 current_interface.uop->op = i;
3969 /* Gets rid of a formal argument list. We do not free symbols.
3970 Symbols are freed when a namespace is freed. */
3973 gfc_free_formal_arglist (gfc_formal_arglist *p)
3975 gfc_formal_arglist *q;
3985 /* Check that it is ok for the type-bound procedure 'proc' to override the
3986 procedure 'old', cf. F08:4.5.7.3. */
3989 gfc_check_typebound_override (gfc_symtree* proc, gfc_symtree* old)
3992 gfc_symbol *proc_target, *old_target;
3993 unsigned proc_pass_arg, old_pass_arg, argpos;
3994 gfc_formal_arglist *proc_formal, *old_formal;
3998 /* This procedure should only be called for non-GENERIC proc. */
3999 gcc_assert (!proc->n.tb->is_generic);
4001 /* If the overwritten procedure is GENERIC, this is an error. */
4002 if (old->n.tb->is_generic)
4004 gfc_error ("Can't overwrite GENERIC '%s' at %L",
4005 old->name, &proc->n.tb->where);
4009 where = proc->n.tb->where;
4010 proc_target = proc->n.tb->u.specific->n.sym;
4011 old_target = old->n.tb->u.specific->n.sym;
4013 /* Check that overridden binding is not NON_OVERRIDABLE. */
4014 if (old->n.tb->non_overridable)
4016 gfc_error ("'%s' at %L overrides a procedure binding declared"
4017 " NON_OVERRIDABLE", proc->name, &where);
4021 /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */
4022 if (!old->n.tb->deferred && proc->n.tb->deferred)
4024 gfc_error ("'%s' at %L must not be DEFERRED as it overrides a"
4025 " non-DEFERRED binding", proc->name, &where);
4029 /* If the overridden binding is PURE, the overriding must be, too. */
4030 if (old_target->attr.pure && !proc_target->attr.pure)
4032 gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE",
4033 proc->name, &where);
4037 /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it
4038 is not, the overriding must not be either. */
4039 if (old_target->attr.elemental && !proc_target->attr.elemental)
4041 gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be"
4042 " ELEMENTAL", proc->name, &where);
4045 if (!old_target->attr.elemental && proc_target->attr.elemental)
4047 gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not"
4048 " be ELEMENTAL, either", proc->name, &where);
4052 /* If the overridden binding is a SUBROUTINE, the overriding must also be a
4054 if (old_target->attr.subroutine && !proc_target->attr.subroutine)
4056 gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a"
4057 " SUBROUTINE", proc->name, &where);
4061 /* If the overridden binding is a FUNCTION, the overriding must also be a
4062 FUNCTION and have the same characteristics. */
4063 if (old_target->attr.function)
4065 if (!proc_target->attr.function)
4067 gfc_error ("'%s' at %L overrides a FUNCTION and must also be a"
4068 " FUNCTION", proc->name, &where);
4072 if (check_result_characteristics (proc_target, old_target,
4073 err, sizeof(err)) == FAILURE)
4075 gfc_error ("Result mismatch for the overriding procedure "
4076 "'%s' at %L: %s", proc->name, &where, err);
4081 /* If the overridden binding is PUBLIC, the overriding one must not be
4083 if (old->n.tb->access == ACCESS_PUBLIC
4084 && proc->n.tb->access == ACCESS_PRIVATE)
4086 gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be"
4087 " PRIVATE", proc->name, &where);
4091 /* Compare the formal argument lists of both procedures. This is also abused
4092 to find the position of the passed-object dummy arguments of both
4093 bindings as at least the overridden one might not yet be resolved and we
4094 need those positions in the check below. */
4095 proc_pass_arg = old_pass_arg = 0;
4096 if (!proc->n.tb->nopass && !proc->n.tb->pass_arg)
4098 if (!old->n.tb->nopass && !old->n.tb->pass_arg)
4101 proc_formal = gfc_sym_get_dummy_args (proc_target);
4102 old_formal = gfc_sym_get_dummy_args (old_target);
4103 for ( ; proc_formal && old_formal;
4104 proc_formal = proc_formal->next, old_formal = old_formal->next)
4106 if (proc->n.tb->pass_arg
4107 && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name))
4108 proc_pass_arg = argpos;
4109 if (old->n.tb->pass_arg
4110 && !strcmp (old->n.tb->pass_arg, old_formal->sym->name))
4111 old_pass_arg = argpos;
4113 /* Check that the names correspond. */
4114 if (strcmp (proc_formal->sym->name, old_formal->sym->name))
4116 gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as"
4117 " to match the corresponding argument of the overridden"
4118 " procedure", proc_formal->sym->name, proc->name, &where,
4119 old_formal->sym->name);
4123 check_type = proc_pass_arg != argpos && old_pass_arg != argpos;
4124 if (check_dummy_characteristics (proc_formal->sym, old_formal->sym,
4125 check_type, err, sizeof(err)) == FAILURE)
4127 gfc_error ("Argument mismatch for the overriding procedure "
4128 "'%s' at %L: %s", proc->name, &where, err);
4134 if (proc_formal || old_formal)
4136 gfc_error ("'%s' at %L must have the same number of formal arguments as"
4137 " the overridden procedure", proc->name, &where);
4141 /* If the overridden binding is NOPASS, the overriding one must also be
4143 if (old->n.tb->nopass && !proc->n.tb->nopass)
4145 gfc_error ("'%s' at %L overrides a NOPASS binding and must also be"
4146 " NOPASS", proc->name, &where);
4150 /* If the overridden binding is PASS(x), the overriding one must also be
4151 PASS and the passed-object dummy arguments must correspond. */
4152 if (!old->n.tb->nopass)
4154 if (proc->n.tb->nopass)
4156 gfc_error ("'%s' at %L overrides a binding with PASS and must also be"
4157 " PASS", proc->name, &where);
4161 if (proc_pass_arg != old_pass_arg)
4163 gfc_error ("Passed-object dummy argument of '%s' at %L must be at"
4164 " the same position as the passed-object dummy argument of"
4165 " the overridden procedure", proc->name, &where);