diff options
Diffstat (limited to 'gcc-4.8.1/gcc/fortran/interface.c')
| -rw-r--r-- | gcc-4.8.1/gcc/fortran/interface.c | 4170 |
1 files changed, 0 insertions, 4170 deletions
diff --git a/gcc-4.8.1/gcc/fortran/interface.c b/gcc-4.8.1/gcc/fortran/interface.c deleted file mode 100644 index 5ea62757f..000000000 --- a/gcc-4.8.1/gcc/fortran/interface.c +++ /dev/null @@ -1,4170 +0,0 @@ -/* Deal with interfaces. - Copyright (C) 2000-2013 Free Software Foundation, Inc. - Contributed by Andy Vaught - -This file is part of GCC. - -GCC is free software; you can redistribute it and/or modify it under -the terms of the GNU General Public License as published by the Free -Software Foundation; either version 3, or (at your option) any later -version. - -GCC is distributed in the hope that it will be useful, but WITHOUT ANY -WARRANTY; without even the implied warranty of MERCHANTABILITY or -FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -for more details. - -You should have received a copy of the GNU General Public License -along with GCC; see the file COPYING3. If not see -<http://www.gnu.org/licenses/>. */ - - -/* Deal with interfaces. An explicit interface is represented as a - singly linked list of formal argument structures attached to the - relevant symbols. For an implicit interface, the arguments don't - point to symbols. Explicit interfaces point to namespaces that - contain the symbols within that interface. - - Implicit interfaces are linked together in a singly linked list - along the next_if member of symbol nodes. Since a particular - symbol can only have a single explicit interface, the symbol cannot - be part of multiple lists and a single next-member suffices. - - This is not the case for general classes, though. An operator - definition is independent of just about all other uses and has it's - own head pointer. - - Nameless interfaces: - Nameless interfaces create symbols with explicit interfaces within - the current namespace. They are otherwise unlinked. - - Generic interfaces: - The generic name points to a linked list of symbols. Each symbol - has an explicit interface. Each explicit interface has its own - namespace containing the arguments. Module procedures are symbols in - which the interface is added later when the module procedure is parsed. - - User operators: - User-defined operators are stored in a their own set of symtrees - separate from regular symbols. The symtrees point to gfc_user_op - structures which in turn head up a list of relevant interfaces. - - Extended intrinsics and assignment: - The head of these interface lists are stored in the containing namespace. - - Implicit interfaces: - An implicit interface is represented as a singly linked list of - formal argument list structures that don't point to any symbol - nodes -- they just contain types. - - - When a subprogram is defined, the program unit's name points to an - interface as usual, but the link to the namespace is NULL and the - formal argument list points to symbols within the same namespace as - the program unit name. */ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "gfortran.h" -#include "match.h" -#include "arith.h" - -/* The current_interface structure holds information about the - interface currently being parsed. This structure is saved and - restored during recursive interfaces. */ - -gfc_interface_info current_interface; - - -/* Free a singly linked list of gfc_interface structures. */ - -void -gfc_free_interface (gfc_interface *intr) -{ - gfc_interface *next; - - for (; intr; intr = next) - { - next = intr->next; - free (intr); - } -} - - -/* Change the operators unary plus and minus into binary plus and - minus respectively, leaving the rest unchanged. */ - -static gfc_intrinsic_op -fold_unary_intrinsic (gfc_intrinsic_op op) -{ - switch (op) - { - case INTRINSIC_UPLUS: - op = INTRINSIC_PLUS; - break; - case INTRINSIC_UMINUS: - op = INTRINSIC_MINUS; - break; - default: - break; - } - - return op; -} - - -/* Match a generic specification. Depending on which type of - interface is found, the 'name' or 'op' pointers may be set. - This subroutine doesn't return MATCH_NO. */ - -match -gfc_match_generic_spec (interface_type *type, - char *name, - gfc_intrinsic_op *op) -{ - char buffer[GFC_MAX_SYMBOL_LEN + 1]; - match m; - gfc_intrinsic_op i; - - if (gfc_match (" assignment ( = )") == MATCH_YES) - { - *type = INTERFACE_INTRINSIC_OP; - *op = INTRINSIC_ASSIGN; - return MATCH_YES; - } - - if (gfc_match (" operator ( %o )", &i) == MATCH_YES) - { /* Operator i/f */ - *type = INTERFACE_INTRINSIC_OP; - *op = fold_unary_intrinsic (i); - return MATCH_YES; - } - - *op = INTRINSIC_NONE; - if (gfc_match (" operator ( ") == MATCH_YES) - { - m = gfc_match_defined_op_name (buffer, 1); - if (m == MATCH_NO) - goto syntax; - if (m != MATCH_YES) - return MATCH_ERROR; - - m = gfc_match_char (')'); - if (m == MATCH_NO) - goto syntax; - if (m != MATCH_YES) - return MATCH_ERROR; - - strcpy (name, buffer); - *type = INTERFACE_USER_OP; - return MATCH_YES; - } - - if (gfc_match_name (buffer) == MATCH_YES) - { - strcpy (name, buffer); - *type = INTERFACE_GENERIC; - return MATCH_YES; - } - - *type = INTERFACE_NAMELESS; - return MATCH_YES; - -syntax: - gfc_error ("Syntax error in generic specification at %C"); - return MATCH_ERROR; -} - - -/* Match one of the five F95 forms of an interface statement. The - matcher for the abstract interface follows. */ - -match -gfc_match_interface (void) -{ - char name[GFC_MAX_SYMBOL_LEN + 1]; - interface_type type; - gfc_symbol *sym; - gfc_intrinsic_op op; - match m; - - m = gfc_match_space (); - - if (gfc_match_generic_spec (&type, name, &op) == MATCH_ERROR) - return MATCH_ERROR; - - /* If we're not looking at the end of the statement now, or if this - is not a nameless interface but we did not see a space, punt. */ - if (gfc_match_eos () != MATCH_YES - || (type != INTERFACE_NAMELESS && m != MATCH_YES)) - { - gfc_error ("Syntax error: Trailing garbage in INTERFACE statement " - "at %C"); - return MATCH_ERROR; - } - - current_interface.type = type; - - switch (type) - { - case INTERFACE_GENERIC: - if (gfc_get_symbol (name, NULL, &sym)) - return MATCH_ERROR; - - if (!sym->attr.generic - && gfc_add_generic (&sym->attr, sym->name, NULL) == FAILURE) - return MATCH_ERROR; - - if (sym->attr.dummy) - { - gfc_error ("Dummy procedure '%s' at %C cannot have a " - "generic interface", sym->name); - return MATCH_ERROR; - } - - current_interface.sym = gfc_new_block = sym; - break; - - case INTERFACE_USER_OP: - current_interface.uop = gfc_get_uop (name); - break; - - case INTERFACE_INTRINSIC_OP: - current_interface.op = op; - break; - - case INTERFACE_NAMELESS: - case INTERFACE_ABSTRACT: - break; - } - - return MATCH_YES; -} - - - -/* Match a F2003 abstract interface. */ - -match -gfc_match_abstract_interface (void) -{ - match m; - - if (gfc_notify_std (GFC_STD_F2003, "ABSTRACT INTERFACE at %C") - == FAILURE) - return MATCH_ERROR; - - m = gfc_match_eos (); - - if (m != MATCH_YES) - { - gfc_error ("Syntax error in ABSTRACT INTERFACE statement at %C"); - return MATCH_ERROR; - } - - current_interface.type = INTERFACE_ABSTRACT; - - return m; -} - - -/* Match the different sort of generic-specs that can be present after - the END INTERFACE itself. */ - -match -gfc_match_end_interface (void) -{ - char name[GFC_MAX_SYMBOL_LEN + 1]; - interface_type type; - gfc_intrinsic_op op; - match m; - - m = gfc_match_space (); - - if (gfc_match_generic_spec (&type, name, &op) == MATCH_ERROR) - return MATCH_ERROR; - - /* If we're not looking at the end of the statement now, or if this - is not a nameless interface but we did not see a space, punt. */ - if (gfc_match_eos () != MATCH_YES - || (type != INTERFACE_NAMELESS && m != MATCH_YES)) - { - gfc_error ("Syntax error: Trailing garbage in END INTERFACE " - "statement at %C"); - return MATCH_ERROR; - } - - m = MATCH_YES; - - switch (current_interface.type) - { - case INTERFACE_NAMELESS: - case INTERFACE_ABSTRACT: - if (type != INTERFACE_NAMELESS) - { - gfc_error ("Expected a nameless interface at %C"); - m = MATCH_ERROR; - } - - break; - - case INTERFACE_INTRINSIC_OP: - if (type != current_interface.type || op != current_interface.op) - { - - if (current_interface.op == INTRINSIC_ASSIGN) - { - m = MATCH_ERROR; - gfc_error ("Expected 'END INTERFACE ASSIGNMENT (=)' at %C"); - } - else - { - const char *s1, *s2; - s1 = gfc_op2string (current_interface.op); - s2 = gfc_op2string (op); - - /* The following if-statements are used to enforce C1202 - from F2003. */ - if ((strcmp(s1, "==") == 0 && strcmp(s2, ".eq.") == 0) - || (strcmp(s1, ".eq.") == 0 && strcmp(s2, "==") == 0)) - break; - if ((strcmp(s1, "/=") == 0 && strcmp(s2, ".ne.") == 0) - || (strcmp(s1, ".ne.") == 0 && strcmp(s2, "/=") == 0)) - break; - if ((strcmp(s1, "<=") == 0 && strcmp(s2, ".le.") == 0) - || (strcmp(s1, ".le.") == 0 && strcmp(s2, "<=") == 0)) - break; - if ((strcmp(s1, "<") == 0 && strcmp(s2, ".lt.") == 0) - || (strcmp(s1, ".lt.") == 0 && strcmp(s2, "<") == 0)) - break; - if ((strcmp(s1, ">=") == 0 && strcmp(s2, ".ge.") == 0) - || (strcmp(s1, ".ge.") == 0 && strcmp(s2, ">=") == 0)) - break; - if ((strcmp(s1, ">") == 0 && strcmp(s2, ".gt.") == 0) - || (strcmp(s1, ".gt.") == 0 && strcmp(s2, ">") == 0)) - break; - - m = MATCH_ERROR; - gfc_error ("Expecting 'END INTERFACE OPERATOR (%s)' at %C, " - "but got %s", s1, s2); - } - - } - - break; - - case INTERFACE_USER_OP: - /* Comparing the symbol node names is OK because only use-associated - symbols can be renamed. */ - if (type != current_interface.type - || strcmp (current_interface.uop->name, name) != 0) - { - gfc_error ("Expecting 'END INTERFACE OPERATOR (.%s.)' at %C", - current_interface.uop->name); - m = MATCH_ERROR; - } - - break; - - case INTERFACE_GENERIC: - if (type != current_interface.type - || strcmp (current_interface.sym->name, name) != 0) - { - gfc_error ("Expecting 'END INTERFACE %s' at %C", - current_interface.sym->name); - m = MATCH_ERROR; - } - - break; - } - - return m; -} - - -/* Compare two derived types using the criteria in 4.4.2 of the standard, - recursing through gfc_compare_types for the components. */ - -int -gfc_compare_derived_types (gfc_symbol *derived1, gfc_symbol *derived2) -{ - gfc_component *dt1, *dt2; - - if (derived1 == derived2) - return 1; - - gcc_assert (derived1 && derived2); - - /* Special case for comparing derived types across namespaces. If the - true names and module names are the same and the module name is - nonnull, then they are equal. */ - if (strcmp (derived1->name, derived2->name) == 0 - && derived1->module != NULL && derived2->module != NULL - && strcmp (derived1->module, derived2->module) == 0) - return 1; - - /* Compare type via the rules of the standard. Both types must have - the SEQUENCE or BIND(C) attribute to be equal. */ - - if (strcmp (derived1->name, derived2->name)) - return 0; - - if (derived1->component_access == ACCESS_PRIVATE - || derived2->component_access == ACCESS_PRIVATE) - return 0; - - if (!(derived1->attr.sequence && derived2->attr.sequence) - && !(derived1->attr.is_bind_c && derived2->attr.is_bind_c)) - return 0; - - dt1 = derived1->components; - dt2 = derived2->components; - - /* Since subtypes of SEQUENCE types must be SEQUENCE types as well, a - simple test can speed things up. Otherwise, lots of things have to - match. */ - for (;;) - { - if (strcmp (dt1->name, dt2->name) != 0) - return 0; - - if (dt1->attr.access != dt2->attr.access) - return 0; - - if (dt1->attr.pointer != dt2->attr.pointer) - return 0; - - if (dt1->attr.dimension != dt2->attr.dimension) - return 0; - - if (dt1->attr.allocatable != dt2->attr.allocatable) - return 0; - - if (dt1->attr.dimension && gfc_compare_array_spec (dt1->as, dt2->as) == 0) - return 0; - - /* Make sure that link lists do not put this function into an - endless recursive loop! */ - if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived) - && !(dt2->ts.type == BT_DERIVED && derived2 == dt2->ts.u.derived) - && gfc_compare_types (&dt1->ts, &dt2->ts) == 0) - return 0; - - else if ((dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived) - && !(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)) - return 0; - - else if (!(dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived) - && (dt1->ts.type == BT_DERIVED && derived1 == dt1->ts.u.derived)) - return 0; - - dt1 = dt1->next; - dt2 = dt2->next; - - if (dt1 == NULL && dt2 == NULL) - break; - if (dt1 == NULL || dt2 == NULL) - return 0; - } - - return 1; -} - - -/* Compare two typespecs, recursively if necessary. */ - -int -gfc_compare_types (gfc_typespec *ts1, gfc_typespec *ts2) -{ - /* See if one of the typespecs is a BT_VOID, which is what is being used - to allow the funcs like c_f_pointer to accept any pointer type. - TODO: Possibly should narrow this to just the one typespec coming in - that is for the formal arg, but oh well. */ - if (ts1->type == BT_VOID || ts2->type == BT_VOID) - return 1; - - if (ts1->type == BT_CLASS - && ts1->u.derived->components->ts.u.derived->attr.unlimited_polymorphic) - return 1; - - /* F2003: C717 */ - if (ts2->type == BT_CLASS && ts1->type == BT_DERIVED - && ts2->u.derived->components->ts.u.derived->attr.unlimited_polymorphic - && (ts1->u.derived->attr.sequence || ts1->u.derived->attr.is_bind_c)) - return 1; - - if (ts1->type != ts2->type - && ((ts1->type != BT_DERIVED && ts1->type != BT_CLASS) - || (ts2->type != BT_DERIVED && ts2->type != BT_CLASS))) - return 0; - if (ts1->type != BT_DERIVED && ts1->type != BT_CLASS) - return (ts1->kind == ts2->kind); - - /* Compare derived types. */ - if (gfc_type_compatible (ts1, ts2)) - return 1; - - return gfc_compare_derived_types (ts1->u.derived ,ts2->u.derived); -} - - -/* Given two symbols that are formal arguments, compare their ranks - and types. Returns nonzero if they have the same rank and type, - zero otherwise. */ - -static int -compare_type_rank (gfc_symbol *s1, gfc_symbol *s2) -{ - gfc_array_spec *as1, *as2; - int r1, r2; - - as1 = (s1->ts.type == BT_CLASS) ? CLASS_DATA (s1)->as : s1->as; - as2 = (s2->ts.type == BT_CLASS) ? CLASS_DATA (s2)->as : s2->as; - - r1 = as1 ? as1->rank : 0; - r2 = as2 ? as2->rank : 0; - - if (r1 != r2 - && (!as1 || as1->type != AS_ASSUMED_RANK) - && (!as2 || as2->type != AS_ASSUMED_RANK)) - return 0; /* Ranks differ. */ - - return gfc_compare_types (&s1->ts, &s2->ts) - || s1->ts.type == BT_ASSUMED || s2->ts.type == BT_ASSUMED; -} - - -/* Given two symbols that are formal arguments, compare their types - and rank and their formal interfaces if they are both dummy - procedures. Returns nonzero if the same, zero if different. */ - -static int -compare_type_rank_if (gfc_symbol *s1, gfc_symbol *s2) -{ - if (s1 == NULL || s2 == NULL) - return s1 == s2 ? 1 : 0; - - if (s1 == s2) - return 1; - - if (s1->attr.flavor != FL_PROCEDURE && s2->attr.flavor != FL_PROCEDURE) - return compare_type_rank (s1, s2); - - if (s1->attr.flavor != FL_PROCEDURE || s2->attr.flavor != FL_PROCEDURE) - return 0; - - /* At this point, both symbols are procedures. It can happen that - external procedures are compared, where one is identified by usage - to be a function or subroutine but the other is not. Check TKR - nonetheless for these cases. */ - if (s1->attr.function == 0 && s1->attr.subroutine == 0) - return s1->attr.external == 1 ? compare_type_rank (s1, s2) : 0; - - if (s2->attr.function == 0 && s2->attr.subroutine == 0) - return s2->attr.external == 1 ? compare_type_rank (s1, s2) : 0; - - /* Now the type of procedure has been identified. */ - if (s1->attr.function != s2->attr.function - || s1->attr.subroutine != s2->attr.subroutine) - return 0; - - if (s1->attr.function && compare_type_rank (s1, s2) == 0) - return 0; - - /* Originally, gfortran recursed here to check the interfaces of passed - procedures. This is explicitly not required by the standard. */ - return 1; -} - - -/* Given a formal argument list and a keyword name, search the list - for that keyword. Returns the correct symbol node if found, NULL - if not found. */ - -static gfc_symbol * -find_keyword_arg (const char *name, gfc_formal_arglist *f) -{ - for (; f; f = f->next) - if (strcmp (f->sym->name, name) == 0) - return f->sym; - - return NULL; -} - - -/******** Interface checking subroutines **********/ - - -/* Given an operator interface and the operator, make sure that all - interfaces for that operator are legal. */ - -bool -gfc_check_operator_interface (gfc_symbol *sym, gfc_intrinsic_op op, - locus opwhere) -{ - gfc_formal_arglist *formal; - sym_intent i1, i2; - bt t1, t2; - int args, r1, r2, k1, k2; - - gcc_assert (sym); - - args = 0; - t1 = t2 = BT_UNKNOWN; - i1 = i2 = INTENT_UNKNOWN; - r1 = r2 = -1; - k1 = k2 = -1; - - for (formal = gfc_sym_get_dummy_args (sym); formal; formal = formal->next) - { - gfc_symbol *fsym = formal->sym; - if (fsym == NULL) - { - gfc_error ("Alternate return cannot appear in operator " - "interface at %L", &sym->declared_at); - return false; - } - if (args == 0) - { - t1 = fsym->ts.type; - i1 = fsym->attr.intent; - r1 = (fsym->as != NULL) ? fsym->as->rank : 0; - k1 = fsym->ts.kind; - } - if (args == 1) - { - t2 = fsym->ts.type; - i2 = fsym->attr.intent; - r2 = (fsym->as != NULL) ? fsym->as->rank : 0; - k2 = fsym->ts.kind; - } - args++; - } - - /* Only +, - and .not. can be unary operators. - .not. cannot be a binary operator. */ - if (args == 0 || args > 2 || (args == 1 && op != INTRINSIC_PLUS - && op != INTRINSIC_MINUS - && op != INTRINSIC_NOT) - || (args == 2 && op == INTRINSIC_NOT)) - { - if (op == INTRINSIC_ASSIGN) - gfc_error ("Assignment operator interface at %L must have " - "two arguments", &sym->declared_at); - else - gfc_error ("Operator interface at %L has the wrong number of arguments", - &sym->declared_at); - return false; - } - - /* Check that intrinsics are mapped to functions, except - INTRINSIC_ASSIGN which should map to a subroutine. */ - if (op == INTRINSIC_ASSIGN) - { - gfc_formal_arglist *dummy_args; - - if (!sym->attr.subroutine) - { - gfc_error ("Assignment operator interface at %L must be " - "a SUBROUTINE", &sym->declared_at); - return false; - } - - /* Allowed are (per F2003, 12.3.2.1.2 Defined assignments): - - First argument an array with different rank than second, - - First argument is a scalar and second an array, - - Types and kinds do not conform, or - - First argument is of derived type. */ - dummy_args = gfc_sym_get_dummy_args (sym); - if (dummy_args->sym->ts.type != BT_DERIVED - && dummy_args->sym->ts.type != BT_CLASS - && (r2 == 0 || r1 == r2) - && (dummy_args->sym->ts.type == dummy_args->next->sym->ts.type - || (gfc_numeric_ts (&dummy_args->sym->ts) - && gfc_numeric_ts (&dummy_args->next->sym->ts)))) - { - gfc_error ("Assignment operator interface at %L must not redefine " - "an INTRINSIC type assignment", &sym->declared_at); - return false; - } - } - else - { - if (!sym->attr.function) - { - gfc_error ("Intrinsic operator interface at %L must be a FUNCTION", - &sym->declared_at); - return false; - } - } - - /* Check intents on operator interfaces. */ - if (op == INTRINSIC_ASSIGN) - { - if (i1 != INTENT_OUT && i1 != INTENT_INOUT) - { - gfc_error ("First argument of defined assignment at %L must be " - "INTENT(OUT) or INTENT(INOUT)", &sym->declared_at); - return false; - } - - if (i2 != INTENT_IN) - { - gfc_error ("Second argument of defined assignment at %L must be " - "INTENT(IN)", &sym->declared_at); - return false; - } - } - else - { - if (i1 != INTENT_IN) - { - gfc_error ("First argument of operator interface at %L must be " - "INTENT(IN)", &sym->declared_at); - return false; - } - - if (args == 2 && i2 != INTENT_IN) - { - gfc_error ("Second argument of operator interface at %L must be " - "INTENT(IN)", &sym->declared_at); - return false; - } - } - - /* From now on, all we have to do is check that the operator definition - doesn't conflict with an intrinsic operator. The rules for this - game are defined in 7.1.2 and 7.1.3 of both F95 and F2003 standards, - as well as 12.3.2.1.1 of Fortran 2003: - - "If the operator is an intrinsic-operator (R310), the number of - function arguments shall be consistent with the intrinsic uses of - that operator, and the types, kind type parameters, or ranks of the - dummy arguments shall differ from those required for the intrinsic - operation (7.1.2)." */ - -#define IS_NUMERIC_TYPE(t) \ - ((t) == BT_INTEGER || (t) == BT_REAL || (t) == BT_COMPLEX) - - /* Unary ops are easy, do them first. */ - if (op == INTRINSIC_NOT) - { - if (t1 == BT_LOGICAL) - goto bad_repl; - else - return true; - } - - if (args == 1 && (op == INTRINSIC_PLUS || op == INTRINSIC_MINUS)) - { - if (IS_NUMERIC_TYPE (t1)) - goto bad_repl; - else - return true; - } - - /* Character intrinsic operators have same character kind, thus - operator definitions with operands of different character kinds - are always safe. */ - if (t1 == BT_CHARACTER && t2 == BT_CHARACTER && k1 != k2) - return true; - - /* Intrinsic operators always perform on arguments of same rank, - so different ranks is also always safe. (rank == 0) is an exception - to that, because all intrinsic operators are elemental. */ - if (r1 != r2 && r1 != 0 && r2 != 0) - return true; - - switch (op) - { - case INTRINSIC_EQ: - case INTRINSIC_EQ_OS: - case INTRINSIC_NE: - case INTRINSIC_NE_OS: - if (t1 == BT_CHARACTER && t2 == BT_CHARACTER) - goto bad_repl; - /* Fall through. */ - - case INTRINSIC_PLUS: - case INTRINSIC_MINUS: - case INTRINSIC_TIMES: - case INTRINSIC_DIVIDE: - case INTRINSIC_POWER: - if (IS_NUMERIC_TYPE (t1) && IS_NUMERIC_TYPE (t2)) - goto bad_repl; - break; - - case INTRINSIC_GT: - case INTRINSIC_GT_OS: - case INTRINSIC_GE: - case INTRINSIC_GE_OS: - case INTRINSIC_LT: - case INTRINSIC_LT_OS: - case INTRINSIC_LE: - case INTRINSIC_LE_OS: - if (t1 == BT_CHARACTER && t2 == BT_CHARACTER) - goto bad_repl; - if ((t1 == BT_INTEGER || t1 == BT_REAL) - && (t2 == BT_INTEGER || t2 == BT_REAL)) - goto bad_repl; - break; - - case INTRINSIC_CONCAT: - if (t1 == BT_CHARACTER && t2 == BT_CHARACTER) - goto bad_repl; - break; - - case INTRINSIC_AND: - case INTRINSIC_OR: - case INTRINSIC_EQV: - case INTRINSIC_NEQV: - if (t1 == BT_LOGICAL && t2 == BT_LOGICAL) - goto bad_repl; - break; - - default: - break; - } - - return true; - -#undef IS_NUMERIC_TYPE - -bad_repl: - gfc_error ("Operator interface at %L conflicts with intrinsic interface", - &opwhere); - return false; -} - - -/* Given a pair of formal argument lists, we see if the two lists can - be distinguished by counting the number of nonoptional arguments of - a given type/rank in f1 and seeing if there are less then that - number of those arguments in f2 (including optional arguments). - Since this test is asymmetric, it has to be called twice to make it - symmetric. Returns nonzero if the argument lists are incompatible - by this test. This subroutine implements rule 1 of section F03:16.2.3. - 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */ - -static int -count_types_test (gfc_formal_arglist *f1, gfc_formal_arglist *f2, - const char *p1, const char *p2) -{ - int rc, ac1, ac2, i, j, k, n1; - gfc_formal_arglist *f; - - typedef struct - { - int flag; - gfc_symbol *sym; - } - arginfo; - - arginfo *arg; - - n1 = 0; - - for (f = f1; f; f = f->next) - n1++; - - /* Build an array of integers that gives the same integer to - arguments of the same type/rank. */ - arg = XCNEWVEC (arginfo, n1); - - f = f1; - for (i = 0; i < n1; i++, f = f->next) - { - arg[i].flag = -1; - arg[i].sym = f->sym; - } - - k = 0; - - for (i = 0; i < n1; i++) - { - if (arg[i].flag != -1) - continue; - - if (arg[i].sym && (arg[i].sym->attr.optional - || (p1 && strcmp (arg[i].sym->name, p1) == 0))) - continue; /* Skip OPTIONAL and PASS arguments. */ - - arg[i].flag = k; - - /* Find other non-optional, non-pass arguments of the same type/rank. */ - for (j = i + 1; j < n1; j++) - if ((arg[j].sym == NULL - || !(arg[j].sym->attr.optional - || (p1 && strcmp (arg[j].sym->name, p1) == 0))) - && (compare_type_rank_if (arg[i].sym, arg[j].sym) - || compare_type_rank_if (arg[j].sym, arg[i].sym))) - arg[j].flag = k; - - k++; - } - - /* Now loop over each distinct type found in f1. */ - k = 0; - rc = 0; - - for (i = 0; i < n1; i++) - { - if (arg[i].flag != k) - continue; - - ac1 = 1; - for (j = i + 1; j < n1; j++) - if (arg[j].flag == k) - ac1++; - - /* Count the number of non-pass arguments in f2 with that type, - including those that are optional. */ - ac2 = 0; - - for (f = f2; f; f = f->next) - if ((!p2 || strcmp (f->sym->name, p2) != 0) - && (compare_type_rank_if (arg[i].sym, f->sym) - || compare_type_rank_if (f->sym, arg[i].sym))) - ac2++; - - if (ac1 > ac2) - { - rc = 1; - break; - } - - k++; - } - - free (arg); - - return rc; -} - - -/* Perform the correspondence test in rule (3) of F08:C1215. - Returns zero if no argument is found that satisfies this rule, - nonzero otherwise. 'p1' and 'p2' are the PASS arguments of both procedures - (if applicable). - - This test is also not symmetric in f1 and f2 and must be called - twice. This test finds problems caused by sorting the actual - argument list with keywords. For example: - - INTERFACE FOO - SUBROUTINE F1(A, B) - INTEGER :: A ; REAL :: B - END SUBROUTINE F1 - - SUBROUTINE F2(B, A) - INTEGER :: A ; REAL :: B - END SUBROUTINE F1 - END INTERFACE FOO - - At this point, 'CALL FOO(A=1, B=1.0)' is ambiguous. */ - -static int -generic_correspondence (gfc_formal_arglist *f1, gfc_formal_arglist *f2, - const char *p1, const char *p2) -{ - gfc_formal_arglist *f2_save, *g; - gfc_symbol *sym; - - f2_save = f2; - - while (f1) - { - if (f1->sym->attr.optional) - goto next; - - if (p1 && strcmp (f1->sym->name, p1) == 0) - f1 = f1->next; - if (f2 && p2 && strcmp (f2->sym->name, p2) == 0) - f2 = f2->next; - - if (f2 != NULL && (compare_type_rank (f1->sym, f2->sym) - || compare_type_rank (f2->sym, f1->sym)) - && !((gfc_option.allow_std & GFC_STD_F2008) - && ((f1->sym->attr.allocatable && f2->sym->attr.pointer) - || (f2->sym->attr.allocatable && f1->sym->attr.pointer)))) - goto next; - - /* Now search for a disambiguating keyword argument starting at - the current non-match. */ - for (g = f1; g; g = g->next) - { - if (g->sym->attr.optional || (p1 && strcmp (g->sym->name, p1) == 0)) - continue; - - sym = find_keyword_arg (g->sym->name, f2_save); - if (sym == NULL || !compare_type_rank (g->sym, sym) - || ((gfc_option.allow_std & GFC_STD_F2008) - && ((sym->attr.allocatable && g->sym->attr.pointer) - || (sym->attr.pointer && g->sym->attr.allocatable)))) - return 1; - } - - next: - if (f1 != NULL) - f1 = f1->next; - if (f2 != NULL) - f2 = f2->next; - } - - return 0; -} - - -/* Check if the characteristics of two dummy arguments match, - cf. F08:12.3.2. */ - -static gfc_try -check_dummy_characteristics (gfc_symbol *s1, gfc_symbol *s2, - bool type_must_agree, char *errmsg, int err_len) -{ - /* Check type and rank. */ - if (type_must_agree && !compare_type_rank (s2, s1)) - { - snprintf (errmsg, err_len, "Type/rank mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* Check INTENT. */ - if (s1->attr.intent != s2->attr.intent) - { - snprintf (errmsg, err_len, "INTENT mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* Check OPTIONAL attribute. */ - if (s1->attr.optional != s2->attr.optional) - { - snprintf (errmsg, err_len, "OPTIONAL mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* Check ALLOCATABLE attribute. */ - if (s1->attr.allocatable != s2->attr.allocatable) - { - snprintf (errmsg, err_len, "ALLOCATABLE mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* Check POINTER attribute. */ - if (s1->attr.pointer != s2->attr.pointer) - { - snprintf (errmsg, err_len, "POINTER mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* Check TARGET attribute. */ - if (s1->attr.target != s2->attr.target) - { - snprintf (errmsg, err_len, "TARGET mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - /* FIXME: Do more comprehensive testing of attributes, like e.g. - ASYNCHRONOUS, CONTIGUOUS, VALUE, VOLATILE, etc. */ - - /* Check interface of dummy procedures. */ - if (s1->attr.flavor == FL_PROCEDURE) - { - char err[200]; - if (!gfc_compare_interfaces (s1, s2, s2->name, 0, 1, err, sizeof(err), - NULL, NULL)) - { - snprintf (errmsg, err_len, "Interface mismatch in dummy procedure " - "'%s': %s", s1->name, err); - return FAILURE; - } - } - - /* Check string length. */ - if (s1->ts.type == BT_CHARACTER - && s1->ts.u.cl && s1->ts.u.cl->length - && s2->ts.u.cl && s2->ts.u.cl->length) - { - int compval = gfc_dep_compare_expr (s1->ts.u.cl->length, - s2->ts.u.cl->length); - switch (compval) - { - case -1: - case 1: - case -3: - snprintf (errmsg, err_len, "Character length mismatch " - "in argument '%s'", s1->name); - return FAILURE; - - case -2: - /* FIXME: Implement a warning for this case. - gfc_warning ("Possible character length mismatch in argument '%s'", - s1->name);*/ - break; - - case 0: - break; - - default: - gfc_internal_error ("check_dummy_characteristics: Unexpected result " - "%i of gfc_dep_compare_expr", compval); - break; - } - } - - /* Check array shape. */ - if (s1->as && s2->as) - { - int i, compval; - gfc_expr *shape1, *shape2; - - if (s1->as->type != s2->as->type) - { - snprintf (errmsg, err_len, "Shape mismatch in argument '%s'", - s1->name); - return FAILURE; - } - - if (s1->as->type == AS_EXPLICIT) - for (i = 0; i < s1->as->rank + s1->as->corank; i++) - { - shape1 = gfc_subtract (gfc_copy_expr (s1->as->upper[i]), - gfc_copy_expr (s1->as->lower[i])); - shape2 = gfc_subtract (gfc_copy_expr (s2->as->upper[i]), - gfc_copy_expr (s2->as->lower[i])); - compval = gfc_dep_compare_expr (shape1, shape2); - gfc_free_expr (shape1); - gfc_free_expr (shape2); - switch (compval) - { - case -1: - case 1: - case -3: - snprintf (errmsg, err_len, "Shape mismatch in dimension %i of " - "argument '%s'", i + 1, s1->name); - return FAILURE; - - case -2: - /* FIXME: Implement a warning for this case. - gfc_warning ("Possible shape mismatch in argument '%s'", - s1->name);*/ - break; - - case 0: - break; - - default: - gfc_internal_error ("check_dummy_characteristics: Unexpected " - "result %i of gfc_dep_compare_expr", - compval); - break; - } - } - } - - return SUCCESS; -} - - -/* Check if the characteristics of two function results match, - cf. F08:12.3.3. */ - -static gfc_try -check_result_characteristics (gfc_symbol *s1, gfc_symbol *s2, - char *errmsg, int err_len) -{ - gfc_symbol *r1, *r2; - - if (s1->ts.interface && s1->ts.interface->result) - r1 = s1->ts.interface->result; - else - r1 = s1->result ? s1->result : s1; - - if (s2->ts.interface && s2->ts.interface->result) - r2 = s2->ts.interface->result; - else - r2 = s2->result ? s2->result : s2; - - if (r1->ts.type == BT_UNKNOWN) - return SUCCESS; - - /* Check type and rank. */ - if (!compare_type_rank (r1, r2)) - { - snprintf (errmsg, err_len, "Type/rank mismatch in function result"); - return FAILURE; - } - - /* Check ALLOCATABLE attribute. */ - if (r1->attr.allocatable != r2->attr.allocatable) - { - snprintf (errmsg, err_len, "ALLOCATABLE attribute mismatch in " - "function result"); - return FAILURE; - } - - /* Check POINTER attribute. */ - if (r1->attr.pointer != r2->attr.pointer) - { - snprintf (errmsg, err_len, "POINTER attribute mismatch in " - "function result"); - return FAILURE; - } - - /* Check CONTIGUOUS attribute. */ - if (r1->attr.contiguous != r2->attr.contiguous) - { - snprintf (errmsg, err_len, "CONTIGUOUS attribute mismatch in " - "function result"); - return FAILURE; - } - - /* Check PROCEDURE POINTER attribute. */ - if (r1 != s1 && r1->attr.proc_pointer != r2->attr.proc_pointer) - { - snprintf (errmsg, err_len, "PROCEDURE POINTER mismatch in " - "function result"); - return FAILURE; - } - - /* Check string length. */ - if (r1->ts.type == BT_CHARACTER && r1->ts.u.cl && r2->ts.u.cl) - { - if (r1->ts.deferred != r2->ts.deferred) - { - snprintf (errmsg, err_len, "Character length mismatch " - "in function result"); - return FAILURE; - } - - if (r1->ts.u.cl->length) - { - int compval = gfc_dep_compare_expr (r1->ts.u.cl->length, - r2->ts.u.cl->length); - switch (compval) - { - case -1: - case 1: - case -3: - snprintf (errmsg, err_len, "Character length mismatch " - "in function result"); - return FAILURE; - - case -2: - /* FIXME: Implement a warning for this case. - snprintf (errmsg, err_len, "Possible character length mismatch " - "in function result");*/ - break; - - case 0: - break; - - default: - gfc_internal_error ("check_result_characteristics (1): Unexpected " - "result %i of gfc_dep_compare_expr", compval); - break; - } - } - } - - /* Check array shape. */ - if (!r1->attr.allocatable && !r1->attr.pointer && r1->as && r2->as) - { - int i, compval; - gfc_expr *shape1, *shape2; - - if (r1->as->type != r2->as->type) - { - snprintf (errmsg, err_len, "Shape mismatch in function result"); - return FAILURE; - } - - if (r1->as->type == AS_EXPLICIT) - for (i = 0; i < r1->as->rank + r1->as->corank; i++) - { - shape1 = gfc_subtract (gfc_copy_expr (r1->as->upper[i]), - gfc_copy_expr (r1->as->lower[i])); - shape2 = gfc_subtract (gfc_copy_expr (r2->as->upper[i]), - gfc_copy_expr (r2->as->lower[i])); - compval = gfc_dep_compare_expr (shape1, shape2); - gfc_free_expr (shape1); - gfc_free_expr (shape2); - switch (compval) - { - case -1: - case 1: - case -3: - snprintf (errmsg, err_len, "Shape mismatch in dimension %i of " - "function result", i + 1); - return FAILURE; - - case -2: - /* FIXME: Implement a warning for this case. - gfc_warning ("Possible shape mismatch in return value");*/ - break; - - case 0: - break; - - default: - gfc_internal_error ("check_result_characteristics (2): " - "Unexpected result %i of " - "gfc_dep_compare_expr", compval); - break; - } - } - } - - return SUCCESS; -} - - -/* 'Compare' two formal interfaces associated with a pair of symbols. - We return nonzero if there exists an actual argument list that - would be ambiguous between the two interfaces, zero otherwise. - 'strict_flag' specifies whether all the characteristics are - required to match, which is not the case for ambiguity checks. - 'p1' and 'p2' are the PASS arguments of both procedures (if applicable). */ - -int -gfc_compare_interfaces (gfc_symbol *s1, gfc_symbol *s2, const char *name2, - int generic_flag, int strict_flag, - char *errmsg, int err_len, - const char *p1, const char *p2) -{ - gfc_formal_arglist *f1, *f2; - - gcc_assert (name2 != NULL); - - if (s1->attr.function && (s2->attr.subroutine - || (!s2->attr.function && s2->ts.type == BT_UNKNOWN - && gfc_get_default_type (name2, s2->ns)->type == BT_UNKNOWN))) - { - if (errmsg != NULL) - snprintf (errmsg, err_len, "'%s' is not a function", name2); - return 0; - } - - if (s1->attr.subroutine && s2->attr.function) - { - if (errmsg != NULL) - snprintf (errmsg, err_len, "'%s' is not a subroutine", name2); - return 0; - } - - /* Do strict checks on all characteristics - (for dummy procedures and procedure pointer assignments). */ - if (!generic_flag && strict_flag) - { - if (s1->attr.function && s2->attr.function) - { - /* If both are functions, check result characteristics. */ - if (check_result_characteristics (s1, s2, errmsg, err_len) - == FAILURE) - return 0; - } - - if (s1->attr.pure && !s2->attr.pure) - { - snprintf (errmsg, err_len, "Mismatch in PURE attribute"); - return 0; - } - if (s1->attr.elemental && !s2->attr.elemental) - { - snprintf (errmsg, err_len, "Mismatch in ELEMENTAL attribute"); - return 0; - } - } - - if (s1->attr.if_source == IFSRC_UNKNOWN - || s2->attr.if_source == IFSRC_UNKNOWN) - return 1; - - f1 = gfc_sym_get_dummy_args (s1); - f2 = gfc_sym_get_dummy_args (s2); - - if (f1 == NULL && f2 == NULL) - return 1; /* Special case: No arguments. */ - - if (generic_flag) - { - if (count_types_test (f1, f2, p1, p2) - || count_types_test (f2, f1, p2, p1)) - return 0; - if (generic_correspondence (f1, f2, p1, p2) - || generic_correspondence (f2, f1, p2, p1)) - return 0; - } - else - /* Perform the abbreviated correspondence test for operators (the - arguments cannot be optional and are always ordered correctly). - This is also done when comparing interfaces for dummy procedures and in - procedure pointer assignments. */ - - for (;;) - { - /* Check existence. */ - if (f1 == NULL && f2 == NULL) - break; - if (f1 == NULL || f2 == NULL) - { - if (errmsg != NULL) - snprintf (errmsg, err_len, "'%s' has the wrong number of " - "arguments", name2); - return 0; - } - - if (UNLIMITED_POLY (f1->sym)) - goto next; - - if (strict_flag) - { - /* Check all characteristics. */ - if (check_dummy_characteristics (f1->sym, f2->sym, - true, errmsg, err_len) == FAILURE) - return 0; - } - else if (!compare_type_rank (f2->sym, f1->sym)) - { - /* Only check type and rank. */ - if (errmsg != NULL) - snprintf (errmsg, err_len, "Type/rank mismatch in argument '%s'", - f1->sym->name); - return 0; - } -next: - f1 = f1->next; - f2 = f2->next; - } - - return 1; -} - - -/* Given a pointer to an interface pointer, remove duplicate - interfaces and make sure that all symbols are either functions - or subroutines, and all of the same kind. Returns nonzero if - something goes wrong. */ - -static int -check_interface0 (gfc_interface *p, const char *interface_name) -{ - gfc_interface *psave, *q, *qlast; - - psave = p; - for (; p; p = p->next) - { - /* Make sure all symbols in the interface have been defined as - functions or subroutines. */ - if (((!p->sym->attr.function && !p->sym->attr.subroutine) - || !p->sym->attr.if_source) - && p->sym->attr.flavor != FL_DERIVED) - { - if (p->sym->attr.external) - gfc_error ("Procedure '%s' in %s at %L has no explicit interface", - p->sym->name, interface_name, &p->sym->declared_at); - else - gfc_error ("Procedure '%s' in %s at %L is neither function nor " - "subroutine", p->sym->name, interface_name, - &p->sym->declared_at); - return 1; - } - - /* Verify that procedures are either all SUBROUTINEs or all FUNCTIONs. */ - if ((psave->sym->attr.function && !p->sym->attr.function - && p->sym->attr.flavor != FL_DERIVED) - || (psave->sym->attr.subroutine && !p->sym->attr.subroutine)) - { - if (p->sym->attr.flavor != FL_DERIVED) - gfc_error ("In %s at %L procedures must be either all SUBROUTINEs" - " or all FUNCTIONs", interface_name, - &p->sym->declared_at); - else - gfc_error ("In %s at %L procedures must be all FUNCTIONs as the " - "generic name is also the name of a derived type", - interface_name, &p->sym->declared_at); - return 1; - } - - /* F2003, C1207. F2008, C1207. */ - if (p->sym->attr.proc == PROC_INTERNAL - && gfc_notify_std (GFC_STD_F2008, "Internal procedure " - "'%s' in %s at %L", p->sym->name, interface_name, - &p->sym->declared_at) == FAILURE) - return 1; - } - p = psave; - - /* Remove duplicate interfaces in this interface list. */ - for (; p; p = p->next) - { - qlast = p; - - for (q = p->next; q;) - { - if (p->sym != q->sym) - { - qlast = q; - q = q->next; - } - else - { - /* Duplicate interface. */ - qlast->next = q->next; - free (q); - q = qlast->next; - } - } - } - - return 0; -} - - -/* Check lists of interfaces to make sure that no two interfaces are - ambiguous. Duplicate interfaces (from the same symbol) are OK here. */ - -static int -check_interface1 (gfc_interface *p, gfc_interface *q0, - int generic_flag, const char *interface_name, - bool referenced) -{ - gfc_interface *q; - for (; p; p = p->next) - for (q = q0; q; q = q->next) - { - if (p->sym == q->sym) - continue; /* Duplicates OK here. */ - - if (p->sym->name == q->sym->name && p->sym->module == q->sym->module) - continue; - - if (p->sym->attr.flavor != FL_DERIVED - && q->sym->attr.flavor != FL_DERIVED - && gfc_compare_interfaces (p->sym, q->sym, q->sym->name, - generic_flag, 0, NULL, 0, NULL, NULL)) - { - if (referenced) - gfc_error ("Ambiguous interfaces '%s' and '%s' in %s at %L", - p->sym->name, q->sym->name, interface_name, - &p->where); - else if (!p->sym->attr.use_assoc && q->sym->attr.use_assoc) - gfc_warning ("Ambiguous interfaces '%s' and '%s' in %s at %L", - p->sym->name, q->sym->name, interface_name, - &p->where); - else - gfc_warning ("Although not referenced, '%s' has ambiguous " - "interfaces at %L", interface_name, &p->where); - return 1; - } - } - return 0; -} - - -/* Check the generic and operator interfaces of symbols to make sure - that none of the interfaces conflict. The check has to be done - after all of the symbols are actually loaded. */ - -static void -check_sym_interfaces (gfc_symbol *sym) -{ - char interface_name[100]; - gfc_interface *p; - - if (sym->ns != gfc_current_ns) - return; - - if (sym->generic != NULL) - { - sprintf (interface_name, "generic interface '%s'", sym->name); - if (check_interface0 (sym->generic, interface_name)) - return; - - for (p = sym->generic; p; p = p->next) - { - if (p->sym->attr.mod_proc - && (p->sym->attr.if_source != IFSRC_DECL - || p->sym->attr.procedure)) - { - gfc_error ("'%s' at %L is not a module procedure", - p->sym->name, &p->where); - return; - } - } - - /* Originally, this test was applied to host interfaces too; - this is incorrect since host associated symbols, from any - source, cannot be ambiguous with local symbols. */ - check_interface1 (sym->generic, sym->generic, 1, interface_name, - sym->attr.referenced || !sym->attr.use_assoc); - } -} - - -static void -check_uop_interfaces (gfc_user_op *uop) -{ - char interface_name[100]; - gfc_user_op *uop2; - gfc_namespace *ns; - - sprintf (interface_name, "operator interface '%s'", uop->name); - if (check_interface0 (uop->op, interface_name)) - return; - - for (ns = gfc_current_ns; ns; ns = ns->parent) - { - uop2 = gfc_find_uop (uop->name, ns); - if (uop2 == NULL) - continue; - - check_interface1 (uop->op, uop2->op, 0, - interface_name, true); - } -} - -/* Given an intrinsic op, return an equivalent op if one exists, - or INTRINSIC_NONE otherwise. */ - -gfc_intrinsic_op -gfc_equivalent_op (gfc_intrinsic_op op) -{ - switch(op) - { - case INTRINSIC_EQ: - return INTRINSIC_EQ_OS; - - case INTRINSIC_EQ_OS: - return INTRINSIC_EQ; - - case INTRINSIC_NE: - return INTRINSIC_NE_OS; - - case INTRINSIC_NE_OS: - return INTRINSIC_NE; - - case INTRINSIC_GT: - return INTRINSIC_GT_OS; - - case INTRINSIC_GT_OS: - return INTRINSIC_GT; - - case INTRINSIC_GE: - return INTRINSIC_GE_OS; - - case INTRINSIC_GE_OS: - return INTRINSIC_GE; - - case INTRINSIC_LT: - return INTRINSIC_LT_OS; - - case INTRINSIC_LT_OS: - return INTRINSIC_LT; - - case INTRINSIC_LE: - return INTRINSIC_LE_OS; - - case INTRINSIC_LE_OS: - return INTRINSIC_LE; - - default: - return INTRINSIC_NONE; - } -} - -/* For the namespace, check generic, user operator and intrinsic - operator interfaces for consistency and to remove duplicate - interfaces. We traverse the whole namespace, counting on the fact - that most symbols will not have generic or operator interfaces. */ - -void -gfc_check_interfaces (gfc_namespace *ns) -{ - gfc_namespace *old_ns, *ns2; - char interface_name[100]; - int i; - - old_ns = gfc_current_ns; - gfc_current_ns = ns; - - gfc_traverse_ns (ns, check_sym_interfaces); - - gfc_traverse_user_op (ns, check_uop_interfaces); - - for (i = GFC_INTRINSIC_BEGIN; i != GFC_INTRINSIC_END; i++) - { - if (i == INTRINSIC_USER) - continue; - - if (i == INTRINSIC_ASSIGN) - strcpy (interface_name, "intrinsic assignment operator"); - else - sprintf (interface_name, "intrinsic '%s' operator", - gfc_op2string ((gfc_intrinsic_op) i)); - - if (check_interface0 (ns->op[i], interface_name)) - continue; - - if (ns->op[i]) - gfc_check_operator_interface (ns->op[i]->sym, (gfc_intrinsic_op) i, - ns->op[i]->where); - - for (ns2 = ns; ns2; ns2 = ns2->parent) - { - gfc_intrinsic_op other_op; - - if (check_interface1 (ns->op[i], ns2->op[i], 0, - interface_name, true)) - goto done; - - /* i should be gfc_intrinsic_op, but has to be int with this cast - here for stupid C++ compatibility rules. */ - other_op = gfc_equivalent_op ((gfc_intrinsic_op) i); - if (other_op != INTRINSIC_NONE - && check_interface1 (ns->op[i], ns2->op[other_op], - 0, interface_name, true)) - goto done; - } - } - -done: - gfc_current_ns = old_ns; -} - - -static int -symbol_rank (gfc_symbol *sym) -{ - if (sym->ts.type == BT_CLASS && CLASS_DATA (sym)->as) - return CLASS_DATA (sym)->as->rank; - - return (sym->as == NULL) ? 0 : sym->as->rank; -} - - -/* Given a symbol of a formal argument list and an expression, if the - formal argument is allocatable, check that the actual argument is - allocatable. Returns nonzero if compatible, zero if not compatible. */ - -static int -compare_allocatable (gfc_symbol *formal, gfc_expr *actual) -{ - symbol_attribute attr; - - if (formal->attr.allocatable - || (formal->ts.type == BT_CLASS && CLASS_DATA (formal)->attr.allocatable)) - { - attr = gfc_expr_attr (actual); - if (!attr.allocatable) - return 0; - } - - return 1; -} - - -/* Given a symbol of a formal argument list and an expression, if the - formal argument is a pointer, see if the actual argument is a - pointer. Returns nonzero if compatible, zero if not compatible. */ - -static int -compare_pointer (gfc_symbol *formal, gfc_expr *actual) -{ - symbol_attribute attr; - - if (formal->attr.pointer - || (formal->ts.type == BT_CLASS && CLASS_DATA (formal) - && CLASS_DATA (formal)->attr.class_pointer)) - { - attr = gfc_expr_attr (actual); - - /* Fortran 2008 allows non-pointer actual arguments. */ - if (!attr.pointer && attr.target && formal->attr.intent == INTENT_IN) - return 2; - - if (!attr.pointer) - return 0; - } - - return 1; -} - - -/* Emit clear error messages for rank mismatch. */ - -static void -argument_rank_mismatch (const char *name, locus *where, - int rank1, int rank2) -{ - - /* TS 29113, C407b. */ - if (rank2 == -1) - { - gfc_error ("The assumed-rank array at %L requires that the dummy argument" - " '%s' has assumed-rank", where, name); - } - else if (rank1 == 0) - { - gfc_error ("Rank mismatch in argument '%s' at %L " - "(scalar and rank-%d)", name, where, rank2); - } - else if (rank2 == 0) - { - gfc_error ("Rank mismatch in argument '%s' at %L " - "(rank-%d and scalar)", name, where, rank1); - } - else - { - gfc_error ("Rank mismatch in argument '%s' at %L " - "(rank-%d and rank-%d)", name, where, rank1, rank2); - } -} - - -/* Given a symbol of a formal argument list and an expression, see if - the two are compatible as arguments. Returns nonzero if - compatible, zero if not compatible. */ - -static int -compare_parameter (gfc_symbol *formal, gfc_expr *actual, - int ranks_must_agree, int is_elemental, locus *where) -{ - gfc_ref *ref; - bool rank_check, is_pointer; - - /* If the formal arg has type BT_VOID, it's to one of the iso_c_binding - procs c_f_pointer or c_f_procpointer, and we need to accept most - pointers the user could give us. This should allow that. */ - if (formal->ts.type == BT_VOID) - return 1; - - if (formal->ts.type == BT_DERIVED - && formal->ts.u.derived && formal->ts.u.derived->ts.is_iso_c - && actual->ts.type == BT_DERIVED - && actual->ts.u.derived && actual->ts.u.derived->ts.is_iso_c) - return 1; - - if (formal->ts.type == BT_CLASS && actual->ts.type == BT_DERIVED) - /* Make sure the vtab symbol is present when - the module variables are generated. */ - gfc_find_derived_vtab (actual->ts.u.derived); - - if (actual->ts.type == BT_PROCEDURE) - { - char err[200]; - gfc_symbol *act_sym = actual->symtree->n.sym; - - if (formal->attr.flavor != FL_PROCEDURE) - { - if (where) - gfc_error ("Invalid procedure argument at %L", &actual->where); - return 0; - } - - if (!gfc_compare_interfaces (formal, act_sym, act_sym->name, 0, 1, err, - sizeof(err), NULL, NULL)) - { - if (where) - gfc_error ("Interface mismatch in dummy procedure '%s' at %L: %s", - formal->name, &actual->where, err); - return 0; - } - - if (formal->attr.function && !act_sym->attr.function) - { - gfc_add_function (&act_sym->attr, act_sym->name, - &act_sym->declared_at); - if (act_sym->ts.type == BT_UNKNOWN - && gfc_set_default_type (act_sym, 1, act_sym->ns) == FAILURE) - return 0; - } - else if (formal->attr.subroutine && !act_sym->attr.subroutine) - gfc_add_subroutine (&act_sym->attr, act_sym->name, - &act_sym->declared_at); - - return 1; - } - - /* F2008, C1241. */ - if (formal->attr.pointer && formal->attr.contiguous - && !gfc_is_simply_contiguous (actual, true)) - { - if (where) - gfc_error ("Actual argument to contiguous pointer dummy '%s' at %L " - "must be simply contiguous", formal->name, &actual->where); - return 0; - } - - if ((actual->expr_type != EXPR_NULL || actual->ts.type != BT_UNKNOWN) - && actual->ts.type != BT_HOLLERITH - && formal->ts.type != BT_ASSUMED - && !gfc_compare_types (&formal->ts, &actual->ts) - && !(formal->ts.type == BT_DERIVED && actual->ts.type == BT_CLASS - && gfc_compare_derived_types (formal->ts.u.derived, - CLASS_DATA (actual)->ts.u.derived))) - { - if (where) - gfc_error ("Type mismatch in argument '%s' at %L; passed %s to %s", - formal->name, &actual->where, gfc_typename (&actual->ts), - gfc_typename (&formal->ts)); - return 0; - } - - /* F2008, 12.5.2.5; IR F08/0073. */ - if (formal->ts.type == BT_CLASS && actual->expr_type != EXPR_NULL - && ((CLASS_DATA (formal)->attr.class_pointer - && !formal->attr.intent == INTENT_IN) - || CLASS_DATA (formal)->attr.allocatable)) - { - if (actual->ts.type != BT_CLASS) - { - if (where) - gfc_error ("Actual argument to '%s' at %L must be polymorphic", - formal->name, &actual->where); - return 0; - } - if (!gfc_compare_derived_types (CLASS_DATA (actual)->ts.u.derived, - CLASS_DATA (formal)->ts.u.derived)) - { - if (where) - gfc_error ("Actual argument to '%s' at %L must have the same " - "declared type", formal->name, &actual->where); - return 0; - } - } - - /* F08: 12.5.2.5 Allocatable and pointer dummy variables. However, this - is necessary also for F03, so retain error for both. - NOTE: Other type/kind errors pre-empt this error. Since they are F03 - compatible, no attempt has been made to channel to this one. */ - if (UNLIMITED_POLY (formal) && !UNLIMITED_POLY (actual) - && (CLASS_DATA (formal)->attr.allocatable - ||CLASS_DATA (formal)->attr.class_pointer)) - { - if (where) - gfc_error ("Actual argument to '%s' at %L must be unlimited " - "polymorphic since the formal argument is a " - "pointer or allocatable unlimited polymorphic " - "entity [F2008: 12.5.2.5]", formal->name, - &actual->where); - return 0; - } - - if (formal->attr.codimension && !gfc_is_coarray (actual)) - { - if (where) - gfc_error ("Actual argument to '%s' at %L must be a coarray", - formal->name, &actual->where); - return 0; - } - - if (formal->attr.codimension && formal->attr.allocatable) - { - gfc_ref *last = NULL; - - for (ref = actual->ref; ref; ref = ref->next) - if (ref->type == REF_COMPONENT) - last = ref; - - /* F2008, 12.5.2.6. */ - if ((last && last->u.c.component->as->corank != formal->as->corank) - || (!last - && actual->symtree->n.sym->as->corank != formal->as->corank)) - { - if (where) - gfc_error ("Corank mismatch in argument '%s' at %L (%d and %d)", - formal->name, &actual->where, formal->as->corank, - last ? last->u.c.component->as->corank - : actual->symtree->n.sym->as->corank); - return 0; - } - } - - if (formal->attr.codimension) - { - /* F2008, 12.5.2.8. */ - if (formal->attr.dimension - && (formal->attr.contiguous || formal->as->type != AS_ASSUMED_SHAPE) - && gfc_expr_attr (actual).dimension - && !gfc_is_simply_contiguous (actual, true)) - { - if (where) - gfc_error ("Actual argument to '%s' at %L must be simply " - "contiguous", formal->name, &actual->where); - return 0; - } - - /* F2008, C1303 and C1304. */ - if (formal->attr.intent != INTENT_INOUT - && (((formal->ts.type == BT_DERIVED || formal->ts.type == BT_CLASS) - && formal->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV - && formal->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE) - || formal->attr.lock_comp)) - - { - if (where) - gfc_error ("Actual argument to non-INTENT(INOUT) dummy '%s' at %L, " - "which is LOCK_TYPE or has a LOCK_TYPE component", - formal->name, &actual->where); - return 0; - } - } - - /* F2008, C1239/C1240. */ - if (actual->expr_type == EXPR_VARIABLE - && (actual->symtree->n.sym->attr.asynchronous - || actual->symtree->n.sym->attr.volatile_) - && (formal->attr.asynchronous || formal->attr.volatile_) - && actual->rank && !gfc_is_simply_contiguous (actual, true) - && ((formal->as->type != AS_ASSUMED_SHAPE && !formal->attr.pointer) - || formal->attr.contiguous)) - { - if (where) - gfc_error ("Dummy argument '%s' has to be a pointer or assumed-shape " - "array without CONTIGUOUS attribute - as actual argument at" - " %L is not simply contiguous and both are ASYNCHRONOUS " - "or VOLATILE", formal->name, &actual->where); - return 0; - } - - if (formal->attr.allocatable && !formal->attr.codimension - && gfc_expr_attr (actual).codimension) - { - if (formal->attr.intent == INTENT_OUT) - { - if (where) - gfc_error ("Passing coarray at %L to allocatable, noncoarray, " - "INTENT(OUT) dummy argument '%s'", &actual->where, - formal->name); - return 0; - } - else if (gfc_option.warn_surprising && where - && formal->attr.intent != INTENT_IN) - gfc_warning ("Passing coarray at %L to allocatable, noncoarray dummy " - "argument '%s', which is invalid if the allocation status" - " is modified", &actual->where, formal->name); - } - - /* If the rank is the same or the formal argument has assumed-rank. */ - if (symbol_rank (formal) == actual->rank || symbol_rank (formal) == -1) - return 1; - - if (actual->ts.type == BT_CLASS && CLASS_DATA (actual)->as - && CLASS_DATA (actual)->as->rank == symbol_rank (formal)) - return 1; - - rank_check = where != NULL && !is_elemental && formal->as - && (formal->as->type == AS_ASSUMED_SHAPE - || formal->as->type == AS_DEFERRED) - && actual->expr_type != EXPR_NULL; - - /* Scalar & coindexed, see: F2008, Section 12.5.2.4. */ - if (rank_check || ranks_must_agree - || (formal->attr.pointer && actual->expr_type != EXPR_NULL) - || (actual->rank != 0 && !(is_elemental || formal->attr.dimension)) - || (actual->rank == 0 - && ((formal->ts.type == BT_CLASS - && CLASS_DATA (formal)->as->type == AS_ASSUMED_SHAPE) - || (formal->ts.type != BT_CLASS - && formal->as->type == AS_ASSUMED_SHAPE)) - && actual->expr_type != EXPR_NULL) - || (actual->rank == 0 && formal->attr.dimension - && gfc_is_coindexed (actual))) - { - if (where) - argument_rank_mismatch (formal->name, &actual->where, - symbol_rank (formal), actual->rank); - return 0; - } - else if (actual->rank != 0 && (is_elemental || formal->attr.dimension)) - return 1; - - /* At this point, we are considering a scalar passed to an array. This - is valid (cf. F95 12.4.1.1, F2003 12.4.1.2, and F2008 12.5.2.4), - - if the actual argument is (a substring of) an element of a - non-assumed-shape/non-pointer/non-polymorphic array; or - - (F2003) if the actual argument is of type character of default/c_char - kind. */ - - is_pointer = actual->expr_type == EXPR_VARIABLE - ? actual->symtree->n.sym->attr.pointer : false; - - for (ref = actual->ref; ref; ref = ref->next) - { - if (ref->type == REF_COMPONENT) - is_pointer = ref->u.c.component->attr.pointer; - else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT - && ref->u.ar.dimen > 0 - && (!ref->next - || (ref->next->type == REF_SUBSTRING && !ref->next->next))) - break; - } - - if (actual->ts.type == BT_CLASS && actual->expr_type != EXPR_NULL) - { - if (where) - gfc_error ("Polymorphic scalar passed to array dummy argument '%s' " - "at %L", formal->name, &actual->where); - return 0; - } - - if (actual->expr_type != EXPR_NULL && ref && actual->ts.type != BT_CHARACTER - && (is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE)) - { - if (where) - gfc_error ("Element of assumed-shaped or pointer " - "array passed to array dummy argument '%s' at %L", - formal->name, &actual->where); - return 0; - } - - if (actual->ts.type == BT_CHARACTER && actual->expr_type != EXPR_NULL - && (!ref || is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE)) - { - if (formal->ts.kind != 1 && (gfc_option.allow_std & GFC_STD_GNU) == 0) - { - if (where) - gfc_error ("Extension: Scalar non-default-kind, non-C_CHAR-kind " - "CHARACTER actual argument with array dummy argument " - "'%s' at %L", formal->name, &actual->where); - return 0; - } - - if (where && (gfc_option.allow_std & GFC_STD_F2003) == 0) - { - gfc_error ("Fortran 2003: Scalar CHARACTER actual argument with " - "array dummy argument '%s' at %L", - formal->name, &actual->where); - return 0; - } - else if ((gfc_option.allow_std & GFC_STD_F2003) == 0) - return 0; - else - return 1; - } - - if (ref == NULL && actual->expr_type != EXPR_NULL) - { - if (where) - argument_rank_mismatch (formal->name, &actual->where, - symbol_rank (formal), actual->rank); - return 0; - } - - return 1; -} - - -/* Returns the storage size of a symbol (formal argument) or - zero if it cannot be determined. */ - -static unsigned long -get_sym_storage_size (gfc_symbol *sym) -{ - int i; - unsigned long strlen, elements; - - if (sym->ts.type == BT_CHARACTER) - { - if (sym->ts.u.cl && sym->ts.u.cl->length - && sym->ts.u.cl->length->expr_type == EXPR_CONSTANT) - strlen = mpz_get_ui (sym->ts.u.cl->length->value.integer); - else - return 0; - } - else - strlen = 1; - - if (symbol_rank (sym) == 0) - return strlen; - - elements = 1; - if (sym->as->type != AS_EXPLICIT) - return 0; - for (i = 0; i < sym->as->rank; i++) - { - if (sym->as->upper[i]->expr_type != EXPR_CONSTANT - || sym->as->lower[i]->expr_type != EXPR_CONSTANT) - return 0; - - elements *= mpz_get_si (sym->as->upper[i]->value.integer) - - mpz_get_si (sym->as->lower[i]->value.integer) + 1L; - } - - return strlen*elements; -} - - -/* Returns the storage size of an expression (actual argument) or - zero if it cannot be determined. For an array element, it returns - the remaining size as the element sequence consists of all storage - units of the actual argument up to the end of the array. */ - -static unsigned long -get_expr_storage_size (gfc_expr *e) -{ - int i; - long int strlen, elements; - long int substrlen = 0; - bool is_str_storage = false; - gfc_ref *ref; - - if (e == NULL) - return 0; - - if (e->ts.type == BT_CHARACTER) - { - if (e->ts.u.cl && e->ts.u.cl->length - && e->ts.u.cl->length->expr_type == EXPR_CONSTANT) - strlen = mpz_get_si (e->ts.u.cl->length->value.integer); - else if (e->expr_type == EXPR_CONSTANT - && (e->ts.u.cl == NULL || e->ts.u.cl->length == NULL)) - strlen = e->value.character.length; - else - return 0; - } - else - strlen = 1; /* Length per element. */ - - if (e->rank == 0 && !e->ref) - return strlen; - - elements = 1; - if (!e->ref) - { - if (!e->shape) - return 0; - for (i = 0; i < e->rank; i++) - elements *= mpz_get_si (e->shape[i]); - return elements*strlen; - } - - for (ref = e->ref; ref; ref = ref->next) - { - if (ref->type == REF_SUBSTRING && ref->u.ss.start - && ref->u.ss.start->expr_type == EXPR_CONSTANT) - { - if (is_str_storage) - { - /* The string length is the substring length. - Set now to full string length. */ - if (!ref->u.ss.length || !ref->u.ss.length->length - || ref->u.ss.length->length->expr_type != EXPR_CONSTANT) - return 0; - - strlen = mpz_get_ui (ref->u.ss.length->length->value.integer); - } - substrlen = strlen - mpz_get_ui (ref->u.ss.start->value.integer) + 1; - continue; - } - - if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION) - for (i = 0; i < ref->u.ar.dimen; i++) - { - long int start, end, stride; - stride = 1; - - if (ref->u.ar.stride[i]) - { - if (ref->u.ar.stride[i]->expr_type == EXPR_CONSTANT) - stride = mpz_get_si (ref->u.ar.stride[i]->value.integer); - else - return 0; - } - - if (ref->u.ar.start[i]) - { - if (ref->u.ar.start[i]->expr_type == EXPR_CONSTANT) - start = mpz_get_si (ref->u.ar.start[i]->value.integer); - else - return 0; - } - else if (ref->u.ar.as->lower[i] - && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT) - start = mpz_get_si (ref->u.ar.as->lower[i]->value.integer); - else - return 0; - - if (ref->u.ar.end[i]) - { - if (ref->u.ar.end[i]->expr_type == EXPR_CONSTANT) - end = mpz_get_si (ref->u.ar.end[i]->value.integer); - else - return 0; - } - else if (ref->u.ar.as->upper[i] - && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT) - end = mpz_get_si (ref->u.ar.as->upper[i]->value.integer); - else - return 0; - - elements *= (end - start)/stride + 1L; - } - else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_FULL) - for (i = 0; i < ref->u.ar.as->rank; i++) - { - if (ref->u.ar.as->lower[i] && ref->u.ar.as->upper[i] - && ref->u.ar.as->lower[i]->expr_type == EXPR_CONSTANT - && ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT) - elements *= mpz_get_si (ref->u.ar.as->upper[i]->value.integer) - - mpz_get_si (ref->u.ar.as->lower[i]->value.integer) - + 1L; - else - return 0; - } - else if (ref->type == REF_ARRAY && ref->u.ar.type == AR_ELEMENT - && e->expr_type == EXPR_VARIABLE) - { - if (ref->u.ar.as->type == AS_ASSUMED_SHAPE - || e->symtree->n.sym->attr.pointer) - { - elements = 1; - continue; - } - - /* Determine the number of remaining elements in the element - sequence for array element designators. */ - is_str_storage = true; - for (i = ref->u.ar.dimen - 1; i >= 0; i--) - { - if (ref->u.ar.start[i] == NULL - || ref->u.ar.start[i]->expr_type != EXPR_CONSTANT - || ref->u.ar.as->upper[i] == NULL - || ref->u.ar.as->lower[i] == NULL - || ref->u.ar.as->upper[i]->expr_type != EXPR_CONSTANT - || ref->u.ar.as->lower[i]->expr_type != EXPR_CONSTANT) - return 0; - - elements - = elements - * (mpz_get_si (ref->u.ar.as->upper[i]->value.integer) - - mpz_get_si (ref->u.ar.as->lower[i]->value.integer) - + 1L) - - (mpz_get_si (ref->u.ar.start[i]->value.integer) - - mpz_get_si (ref->u.ar.as->lower[i]->value.integer)); - } - } - } - - if (substrlen) - return (is_str_storage) ? substrlen + (elements-1)*strlen - : elements*strlen; - else - return elements*strlen; -} - - -/* Given an expression, check whether it is an array section - which has a vector subscript. If it has, one is returned, - otherwise zero. */ - -int -gfc_has_vector_subscript (gfc_expr *e) -{ - int i; - gfc_ref *ref; - - if (e == NULL || e->rank == 0 || e->expr_type != EXPR_VARIABLE) - return 0; - - for (ref = e->ref; ref; ref = ref->next) - if (ref->type == REF_ARRAY && ref->u.ar.type == AR_SECTION) - for (i = 0; i < ref->u.ar.dimen; i++) - if (ref->u.ar.dimen_type[i] == DIMEN_VECTOR) - return 1; - - return 0; -} - - -/* Given formal and actual argument lists, see if they are compatible. - If they are compatible, the actual argument list is sorted to - correspond with the formal list, and elements for missing optional - arguments are inserted. If WHERE pointer is nonnull, then we issue - errors when things don't match instead of just returning the status - code. */ - -static int -compare_actual_formal (gfc_actual_arglist **ap, gfc_formal_arglist *formal, - int ranks_must_agree, int is_elemental, locus *where) -{ - gfc_actual_arglist **new_arg, *a, *actual, temp; - gfc_formal_arglist *f; - int i, n, na; - unsigned long actual_size, formal_size; - bool full_array = false; - - actual = *ap; - - if (actual == NULL && formal == NULL) - return 1; - - n = 0; - for (f = formal; f; f = f->next) - n++; - - new_arg = XALLOCAVEC (gfc_actual_arglist *, n); - - for (i = 0; i < n; i++) - new_arg[i] = NULL; - - na = 0; - f = formal; - i = 0; - - for (a = actual; a; a = a->next, f = f->next) - { - /* Look for keywords but ignore g77 extensions like %VAL. */ - if (a->name != NULL && a->name[0] != '%') - { - i = 0; - for (f = formal; f; f = f->next, i++) - { - if (f->sym == NULL) - continue; - if (strcmp (f->sym->name, a->name) == 0) - break; - } - - if (f == NULL) - { - if (where) - gfc_error ("Keyword argument '%s' at %L is not in " - "the procedure", a->name, &a->expr->where); - return 0; - } - - if (new_arg[i] != NULL) - { - if (where) - gfc_error ("Keyword argument '%s' at %L is already associated " - "with another actual argument", a->name, - &a->expr->where); - return 0; - } - } - - if (f == NULL) - { - if (where) - gfc_error ("More actual than formal arguments in procedure " - "call at %L", where); - - return 0; - } - - if (f->sym == NULL && a->expr == NULL) - goto match; - - if (f->sym == NULL) - { - if (where) - gfc_error ("Missing alternate return spec in subroutine call " - "at %L", where); - return 0; - } - - if (a->expr == NULL) - { - if (where) - gfc_error ("Unexpected alternate return spec in subroutine " - "call at %L", where); - return 0; - } - - /* Make sure that intrinsic vtables exist for calls to unlimited - polymorphic formal arguments. */ - if (UNLIMITED_POLY(f->sym) - && a->expr->ts.type != BT_DERIVED - && a->expr->ts.type != BT_CLASS) - gfc_find_intrinsic_vtab (&a->expr->ts); - - if (a->expr->expr_type == EXPR_NULL - && ((f->sym->ts.type != BT_CLASS && !f->sym->attr.pointer - && (f->sym->attr.allocatable || !f->sym->attr.optional - || (gfc_option.allow_std & GFC_STD_F2008) == 0)) - || (f->sym->ts.type == BT_CLASS - && !CLASS_DATA (f->sym)->attr.class_pointer - && (CLASS_DATA (f->sym)->attr.allocatable - || !f->sym->attr.optional - || (gfc_option.allow_std & GFC_STD_F2008) == 0)))) - { - if (where - && (!f->sym->attr.optional - || (f->sym->ts.type != BT_CLASS && f->sym->attr.allocatable) - || (f->sym->ts.type == BT_CLASS - && CLASS_DATA (f->sym)->attr.allocatable))) - gfc_error ("Unexpected NULL() intrinsic at %L to dummy '%s'", - where, f->sym->name); - else if (where) - gfc_error ("Fortran 2008: Null pointer at %L to non-pointer " - "dummy '%s'", where, f->sym->name); - - return 0; - } - - if (!compare_parameter (f->sym, a->expr, ranks_must_agree, - is_elemental, where)) - return 0; - - /* TS 29113, 6.3p2. */ - if (f->sym->ts.type == BT_ASSUMED - && (a->expr->ts.type == BT_DERIVED - || (a->expr->ts.type == BT_CLASS && CLASS_DATA (a->expr)))) - { - gfc_namespace *f2k_derived; - - f2k_derived = a->expr->ts.type == BT_DERIVED - ? a->expr->ts.u.derived->f2k_derived - : CLASS_DATA (a->expr)->ts.u.derived->f2k_derived; - - if (f2k_derived - && (f2k_derived->finalizers || f2k_derived->tb_sym_root)) - { - gfc_error ("Actual argument at %L to assumed-type dummy is of " - "derived type with type-bound or FINAL procedures", - &a->expr->where); - return FAILURE; - } - } - - /* Special case for character arguments. For allocatable, pointer - and assumed-shape dummies, the string length needs to match - exactly. */ - if (a->expr->ts.type == BT_CHARACTER - && a->expr->ts.u.cl && a->expr->ts.u.cl->length - && a->expr->ts.u.cl->length->expr_type == EXPR_CONSTANT - && f->sym->ts.u.cl && f->sym->ts.u.cl && f->sym->ts.u.cl->length - && f->sym->ts.u.cl->length->expr_type == EXPR_CONSTANT - && (f->sym->attr.pointer || f->sym->attr.allocatable - || (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE)) - && (mpz_cmp (a->expr->ts.u.cl->length->value.integer, - f->sym->ts.u.cl->length->value.integer) != 0)) - { - if (where && (f->sym->attr.pointer || f->sym->attr.allocatable)) - gfc_warning ("Character length mismatch (%ld/%ld) between actual " - "argument and pointer or allocatable dummy argument " - "'%s' at %L", - mpz_get_si (a->expr->ts.u.cl->length->value.integer), - mpz_get_si (f->sym->ts.u.cl->length->value.integer), - f->sym->name, &a->expr->where); - else if (where) - gfc_warning ("Character length mismatch (%ld/%ld) between actual " - "argument and assumed-shape dummy argument '%s' " - "at %L", - mpz_get_si (a->expr->ts.u.cl->length->value.integer), - mpz_get_si (f->sym->ts.u.cl->length->value.integer), - f->sym->name, &a->expr->where); - return 0; - } - - if ((f->sym->attr.pointer || f->sym->attr.allocatable) - && f->sym->ts.deferred != a->expr->ts.deferred - && a->expr->ts.type == BT_CHARACTER) - { - if (where) - gfc_error ("Actual argument at %L to allocatable or " - "pointer dummy argument '%s' must have a deferred " - "length type parameter if and only if the dummy has one", - &a->expr->where, f->sym->name); - return 0; - } - - if (f->sym->ts.type == BT_CLASS) - goto skip_size_check; - - actual_size = get_expr_storage_size (a->expr); - formal_size = get_sym_storage_size (f->sym); - if (actual_size != 0 && actual_size < formal_size - && a->expr->ts.type != BT_PROCEDURE - && f->sym->attr.flavor != FL_PROCEDURE) - { - if (a->expr->ts.type == BT_CHARACTER && !f->sym->as && where) - gfc_warning ("Character length of actual argument shorter " - "than of dummy argument '%s' (%lu/%lu) at %L", - f->sym->name, actual_size, formal_size, - &a->expr->where); - else if (where) - gfc_warning ("Actual argument contains too few " - "elements for dummy argument '%s' (%lu/%lu) at %L", - f->sym->name, actual_size, formal_size, - &a->expr->where); - return 0; - } - - skip_size_check: - - /* Satisfy F03:12.4.1.3 by ensuring that a procedure pointer actual - argument is provided for a procedure pointer formal argument. */ - if (f->sym->attr.proc_pointer - && !((a->expr->expr_type == EXPR_VARIABLE - && a->expr->symtree->n.sym->attr.proc_pointer) - || (a->expr->expr_type == EXPR_FUNCTION - && a->expr->symtree->n.sym->result->attr.proc_pointer) - || gfc_is_proc_ptr_comp (a->expr))) - { - if (where) - gfc_error ("Expected a procedure pointer for argument '%s' at %L", - f->sym->name, &a->expr->where); - return 0; - } - - /* Satisfy F03:12.4.1.3 by ensuring that a procedure actual argument is - provided for a procedure formal argument. */ - if (f->sym->attr.flavor == FL_PROCEDURE - && gfc_expr_attr (a->expr).flavor != FL_PROCEDURE) - { - if (where) - gfc_error ("Expected a procedure for argument '%s' at %L", - f->sym->name, &a->expr->where); - return 0; - } - - if (f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE - && a->expr->expr_type == EXPR_VARIABLE - && a->expr->symtree->n.sym->as - && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SIZE - && (a->expr->ref == NULL - || (a->expr->ref->type == REF_ARRAY - && a->expr->ref->u.ar.type == AR_FULL))) - { - if (where) - gfc_error ("Actual argument for '%s' cannot be an assumed-size" - " array at %L", f->sym->name, where); - return 0; - } - - if (a->expr->expr_type != EXPR_NULL - && compare_pointer (f->sym, a->expr) == 0) - { - if (where) - gfc_error ("Actual argument for '%s' must be a pointer at %L", - f->sym->name, &a->expr->where); - return 0; - } - - if (a->expr->expr_type != EXPR_NULL - && (gfc_option.allow_std & GFC_STD_F2008) == 0 - && compare_pointer (f->sym, a->expr) == 2) - { - if (where) - gfc_error ("Fortran 2008: Non-pointer actual argument at %L to " - "pointer dummy '%s'", &a->expr->where,f->sym->name); - return 0; - } - - - /* Fortran 2008, C1242. */ - if (f->sym->attr.pointer && gfc_is_coindexed (a->expr)) - { - if (where) - gfc_error ("Coindexed actual argument at %L to pointer " - "dummy '%s'", - &a->expr->where, f->sym->name); - return 0; - } - - /* Fortran 2008, 12.5.2.5 (no constraint). */ - if (a->expr->expr_type == EXPR_VARIABLE - && f->sym->attr.intent != INTENT_IN - && f->sym->attr.allocatable - && gfc_is_coindexed (a->expr)) - { - if (where) - gfc_error ("Coindexed actual argument at %L to allocatable " - "dummy '%s' requires INTENT(IN)", - &a->expr->where, f->sym->name); - return 0; - } - - /* Fortran 2008, C1237. */ - if (a->expr->expr_type == EXPR_VARIABLE - && (f->sym->attr.asynchronous || f->sym->attr.volatile_) - && gfc_is_coindexed (a->expr) - && (a->expr->symtree->n.sym->attr.volatile_ - || a->expr->symtree->n.sym->attr.asynchronous)) - { - if (where) - gfc_error ("Coindexed ASYNCHRONOUS or VOLATILE actual argument at " - "%L requires that dummy '%s' has neither " - "ASYNCHRONOUS nor VOLATILE", &a->expr->where, - f->sym->name); - return 0; - } - - /* Fortran 2008, 12.5.2.4 (no constraint). */ - if (a->expr->expr_type == EXPR_VARIABLE - && f->sym->attr.intent != INTENT_IN && !f->sym->attr.value - && gfc_is_coindexed (a->expr) - && gfc_has_ultimate_allocatable (a->expr)) - { - if (where) - gfc_error ("Coindexed actual argument at %L with allocatable " - "ultimate component to dummy '%s' requires either VALUE " - "or INTENT(IN)", &a->expr->where, f->sym->name); - return 0; - } - - if (f->sym->ts.type == BT_CLASS - && CLASS_DATA (f->sym)->attr.allocatable - && gfc_is_class_array_ref (a->expr, &full_array) - && !full_array) - { - if (where) - gfc_error ("Actual CLASS array argument for '%s' must be a full " - "array at %L", f->sym->name, &a->expr->where); - return 0; - } - - - if (a->expr->expr_type != EXPR_NULL - && compare_allocatable (f->sym, a->expr) == 0) - { - if (where) - gfc_error ("Actual argument for '%s' must be ALLOCATABLE at %L", - f->sym->name, &a->expr->where); - return 0; - } - - /* Check intent = OUT/INOUT for definable actual argument. */ - if ((f->sym->attr.intent == INTENT_OUT - || f->sym->attr.intent == INTENT_INOUT)) - { - const char* context = (where - ? _("actual argument to INTENT = OUT/INOUT") - : NULL); - - if (((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok - && CLASS_DATA (f->sym)->attr.class_pointer) - || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer)) - && gfc_check_vardef_context (a->expr, true, false, false, context) - == FAILURE) - return 0; - if (gfc_check_vardef_context (a->expr, false, false, false, context) - == FAILURE) - return 0; - } - - if ((f->sym->attr.intent == INTENT_OUT - || f->sym->attr.intent == INTENT_INOUT - || f->sym->attr.volatile_ - || f->sym->attr.asynchronous) - && gfc_has_vector_subscript (a->expr)) - { - if (where) - gfc_error ("Array-section actual argument with vector " - "subscripts at %L is incompatible with INTENT(OUT), " - "INTENT(INOUT), VOLATILE or ASYNCHRONOUS attribute " - "of the dummy argument '%s'", - &a->expr->where, f->sym->name); - return 0; - } - - /* C1232 (R1221) For an actual argument which is an array section or - an assumed-shape array, the dummy argument shall be an assumed- - shape array, if the dummy argument has the VOLATILE attribute. */ - - if (f->sym->attr.volatile_ - && a->expr->symtree->n.sym->as - && a->expr->symtree->n.sym->as->type == AS_ASSUMED_SHAPE - && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE)) - { - if (where) - gfc_error ("Assumed-shape actual argument at %L is " - "incompatible with the non-assumed-shape " - "dummy argument '%s' due to VOLATILE attribute", - &a->expr->where,f->sym->name); - return 0; - } - - if (f->sym->attr.volatile_ - && a->expr->ref && a->expr->ref->u.ar.type == AR_SECTION - && !(f->sym->as && f->sym->as->type == AS_ASSUMED_SHAPE)) - { - if (where) - gfc_error ("Array-section actual argument at %L is " - "incompatible with the non-assumed-shape " - "dummy argument '%s' due to VOLATILE attribute", - &a->expr->where,f->sym->name); - return 0; - } - - /* C1233 (R1221) For an actual argument which is a pointer array, the - dummy argument shall be an assumed-shape or pointer array, if the - dummy argument has the VOLATILE attribute. */ - - if (f->sym->attr.volatile_ - && a->expr->symtree->n.sym->attr.pointer - && a->expr->symtree->n.sym->as - && !(f->sym->as - && (f->sym->as->type == AS_ASSUMED_SHAPE - || f->sym->attr.pointer))) - { - if (where) - gfc_error ("Pointer-array actual argument at %L requires " - "an assumed-shape or pointer-array dummy " - "argument '%s' due to VOLATILE attribute", - &a->expr->where,f->sym->name); - return 0; - } - - match: - if (a == actual) - na = i; - - new_arg[i++] = a; - } - - /* Make sure missing actual arguments are optional. */ - i = 0; - for (f = formal; f; f = f->next, i++) - { - if (new_arg[i] != NULL) - continue; - if (f->sym == NULL) - { - if (where) - gfc_error ("Missing alternate return spec in subroutine call " - "at %L", where); - return 0; - } - if (!f->sym->attr.optional) - { - if (where) - gfc_error ("Missing actual argument for argument '%s' at %L", - f->sym->name, where); - return 0; - } - } - - /* The argument lists are compatible. We now relink a new actual - argument list with null arguments in the right places. The head - of the list remains the head. */ - for (i = 0; i < n; i++) - if (new_arg[i] == NULL) - new_arg[i] = gfc_get_actual_arglist (); - - if (na != 0) - { - temp = *new_arg[0]; - *new_arg[0] = *actual; - *actual = temp; - - a = new_arg[0]; - new_arg[0] = new_arg[na]; - new_arg[na] = a; - } - - for (i = 0; i < n - 1; i++) - new_arg[i]->next = new_arg[i + 1]; - - new_arg[i]->next = NULL; - - if (*ap == NULL && n > 0) - *ap = new_arg[0]; - - /* Note the types of omitted optional arguments. */ - for (a = *ap, f = formal; a; a = a->next, f = f->next) - if (a->expr == NULL && a->label == NULL) - a->missing_arg_type = f->sym->ts.type; - - return 1; -} - - -typedef struct -{ - gfc_formal_arglist *f; - gfc_actual_arglist *a; -} -argpair; - -/* qsort comparison function for argument pairs, with the following - order: - - p->a->expr == NULL - - p->a->expr->expr_type != EXPR_VARIABLE - - growing p->a->expr->symbol. */ - -static int -pair_cmp (const void *p1, const void *p2) -{ - const gfc_actual_arglist *a1, *a2; - - /* *p1 and *p2 are elements of the to-be-sorted array. */ - a1 = ((const argpair *) p1)->a; - a2 = ((const argpair *) p2)->a; - if (!a1->expr) - { - if (!a2->expr) - return 0; - return -1; - } - if (!a2->expr) - return 1; - if (a1->expr->expr_type != EXPR_VARIABLE) - { - if (a2->expr->expr_type != EXPR_VARIABLE) - return 0; - return -1; - } - if (a2->expr->expr_type != EXPR_VARIABLE) - return 1; - return a1->expr->symtree->n.sym < a2->expr->symtree->n.sym; -} - - -/* Given two expressions from some actual arguments, test whether they - refer to the same expression. The analysis is conservative. - Returning FAILURE will produce no warning. */ - -static gfc_try -compare_actual_expr (gfc_expr *e1, gfc_expr *e2) -{ - const gfc_ref *r1, *r2; - - if (!e1 || !e2 - || e1->expr_type != EXPR_VARIABLE - || e2->expr_type != EXPR_VARIABLE - || e1->symtree->n.sym != e2->symtree->n.sym) - return FAILURE; - - /* TODO: improve comparison, see expr.c:show_ref(). */ - for (r1 = e1->ref, r2 = e2->ref; r1 && r2; r1 = r1->next, r2 = r2->next) - { - if (r1->type != r2->type) - return FAILURE; - switch (r1->type) - { - case REF_ARRAY: - if (r1->u.ar.type != r2->u.ar.type) - return FAILURE; - /* TODO: At the moment, consider only full arrays; - we could do better. */ - if (r1->u.ar.type != AR_FULL || r2->u.ar.type != AR_FULL) - return FAILURE; - break; - - case REF_COMPONENT: - if (r1->u.c.component != r2->u.c.component) - return FAILURE; - break; - - case REF_SUBSTRING: - return FAILURE; - - default: - gfc_internal_error ("compare_actual_expr(): Bad component code"); - } - } - if (!r1 && !r2) - return SUCCESS; - return FAILURE; -} - - -/* Given formal and actual argument lists that correspond to one - another, check that identical actual arguments aren't not - associated with some incompatible INTENTs. */ - -static gfc_try -check_some_aliasing (gfc_formal_arglist *f, gfc_actual_arglist *a) -{ - sym_intent f1_intent, f2_intent; - gfc_formal_arglist *f1; - gfc_actual_arglist *a1; - size_t n, i, j; - argpair *p; - gfc_try t = SUCCESS; - - n = 0; - for (f1 = f, a1 = a;; f1 = f1->next, a1 = a1->next) - { - if (f1 == NULL && a1 == NULL) - break; - if (f1 == NULL || a1 == NULL) - gfc_internal_error ("check_some_aliasing(): List mismatch"); - n++; - } - if (n == 0) - return t; - p = XALLOCAVEC (argpair, n); - - for (i = 0, f1 = f, a1 = a; i < n; i++, f1 = f1->next, a1 = a1->next) - { - p[i].f = f1; - p[i].a = a1; - } - - qsort (p, n, sizeof (argpair), pair_cmp); - - for (i = 0; i < n; i++) - { - if (!p[i].a->expr - || p[i].a->expr->expr_type != EXPR_VARIABLE - || p[i].a->expr->ts.type == BT_PROCEDURE) - continue; - f1_intent = p[i].f->sym->attr.intent; - for (j = i + 1; j < n; j++) - { - /* Expected order after the sort. */ - if (!p[j].a->expr || p[j].a->expr->expr_type != EXPR_VARIABLE) - gfc_internal_error ("check_some_aliasing(): corrupted data"); - - /* Are the expression the same? */ - if (compare_actual_expr (p[i].a->expr, p[j].a->expr) == FAILURE) - break; - f2_intent = p[j].f->sym->attr.intent; - if ((f1_intent == INTENT_IN && f2_intent == INTENT_OUT) - || (f1_intent == INTENT_OUT && f2_intent == INTENT_IN)) - { - gfc_warning ("Same actual argument associated with INTENT(%s) " - "argument '%s' and INTENT(%s) argument '%s' at %L", - gfc_intent_string (f1_intent), p[i].f->sym->name, - gfc_intent_string (f2_intent), p[j].f->sym->name, - &p[i].a->expr->where); - t = FAILURE; - } - } - } - - return t; -} - - -/* Given formal and actual argument lists that correspond to one - another, check that they are compatible in the sense that intents - are not mismatched. */ - -static gfc_try -check_intents (gfc_formal_arglist *f, gfc_actual_arglist *a) -{ - sym_intent f_intent; - - for (;; f = f->next, a = a->next) - { - if (f == NULL && a == NULL) - break; - if (f == NULL || a == NULL) - gfc_internal_error ("check_intents(): List mismatch"); - - if (a->expr == NULL || a->expr->expr_type != EXPR_VARIABLE) - continue; - - f_intent = f->sym->attr.intent; - - if (gfc_pure (NULL) && gfc_impure_variable (a->expr->symtree->n.sym)) - { - if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok - && CLASS_DATA (f->sym)->attr.class_pointer) - || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer)) - { - gfc_error ("Procedure argument at %L is local to a PURE " - "procedure and has the POINTER attribute", - &a->expr->where); - return FAILURE; - } - } - - /* Fortran 2008, C1283. */ - if (gfc_pure (NULL) && gfc_is_coindexed (a->expr)) - { - if (f_intent == INTENT_INOUT || f_intent == INTENT_OUT) - { - gfc_error ("Coindexed actual argument at %L in PURE procedure " - "is passed to an INTENT(%s) argument", - &a->expr->where, gfc_intent_string (f_intent)); - return FAILURE; - } - - if ((f->sym->ts.type == BT_CLASS && f->sym->attr.class_ok - && CLASS_DATA (f->sym)->attr.class_pointer) - || (f->sym->ts.type != BT_CLASS && f->sym->attr.pointer)) - { - gfc_error ("Coindexed actual argument at %L in PURE procedure " - "is passed to a POINTER dummy argument", - &a->expr->where); - return FAILURE; - } - } - - /* F2008, Section 12.5.2.4. */ - if (a->expr->ts.type == BT_CLASS && f->sym->ts.type == BT_CLASS - && gfc_is_coindexed (a->expr)) - { - gfc_error ("Coindexed polymorphic actual argument at %L is passed " - "polymorphic dummy argument '%s'", - &a->expr->where, f->sym->name); - return FAILURE; - } - } - - return SUCCESS; -} - - -/* Check how a procedure is used against its interface. If all goes - well, the actual argument list will also end up being properly - sorted. */ - -gfc_try -gfc_procedure_use (gfc_symbol *sym, gfc_actual_arglist **ap, locus *where) -{ - gfc_formal_arglist *dummy_args; - - /* Warn about calls with an implicit interface. Special case - for calling a ISO_C_BINDING becase c_loc and c_funloc - are pseudo-unknown. Additionally, warn about procedures not - explicitly declared at all if requested. */ - if (sym->attr.if_source == IFSRC_UNKNOWN && ! sym->attr.is_iso_c) - { - if (gfc_option.warn_implicit_interface) - gfc_warning ("Procedure '%s' called with an implicit interface at %L", - sym->name, where); - else if (gfc_option.warn_implicit_procedure - && sym->attr.proc == PROC_UNKNOWN) - gfc_warning ("Procedure '%s' called at %L is not explicitly declared", - sym->name, where); - } - - if (sym->attr.if_source == IFSRC_UNKNOWN) - { - gfc_actual_arglist *a; - - if (sym->attr.pointer) - { - gfc_error("The pointer object '%s' at %L must have an explicit " - "function interface or be declared as array", - sym->name, where); - return FAILURE; - } - - if (sym->attr.allocatable && !sym->attr.external) - { - gfc_error("The allocatable object '%s' at %L must have an explicit " - "function interface or be declared as array", - sym->name, where); - return FAILURE; - } - - if (sym->attr.allocatable) - { - gfc_error("Allocatable function '%s' at %L must have an explicit " - "function interface", sym->name, where); - return FAILURE; - } - - for (a = *ap; a; a = a->next) - { - /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */ - if (a->name != NULL && a->name[0] != '%') - { - gfc_error("Keyword argument requires explicit interface " - "for procedure '%s' at %L", sym->name, &a->expr->where); - break; - } - - /* TS 29113, 6.2. */ - if (a->expr && a->expr->ts.type == BT_ASSUMED - && sym->intmod_sym_id != ISOCBINDING_LOC) - { - gfc_error ("Assumed-type argument %s at %L requires an explicit " - "interface", a->expr->symtree->n.sym->name, - &a->expr->where); - break; - } - - /* F2008, C1303 and C1304. */ - if (a->expr - && (a->expr->ts.type == BT_DERIVED || a->expr->ts.type == BT_CLASS) - && ((a->expr->ts.u.derived->from_intmod == INTMOD_ISO_FORTRAN_ENV - && a->expr->ts.u.derived->intmod_sym_id == ISOFORTRAN_LOCK_TYPE) - || gfc_expr_attr (a->expr).lock_comp)) - { - gfc_error("Actual argument of LOCK_TYPE or with LOCK_TYPE " - "component at %L requires an explicit interface for " - "procedure '%s'", &a->expr->where, sym->name); - break; - } - - if (a->expr && a->expr->expr_type == EXPR_NULL - && a->expr->ts.type == BT_UNKNOWN) - { - gfc_error ("MOLD argument to NULL required at %L", &a->expr->where); - return FAILURE; - } - - /* TS 29113, C407b. */ - if (a->expr && a->expr->expr_type == EXPR_VARIABLE - && symbol_rank (a->expr->symtree->n.sym) == -1) - { - gfc_error ("Assumed-rank argument requires an explicit interface " - "at %L", &a->expr->where); - return FAILURE; - } - } - - return SUCCESS; - } - - dummy_args = gfc_sym_get_dummy_args (sym); - - if (!compare_actual_formal (ap, dummy_args, 0, sym->attr.elemental, where)) - return FAILURE; - - if (check_intents (dummy_args, *ap) == FAILURE) - return FAILURE; - - if (gfc_option.warn_aliasing) - check_some_aliasing (dummy_args, *ap); - - return SUCCESS; -} - - -/* Check how a procedure pointer component is used against its interface. - If all goes well, the actual argument list will also end up being properly - sorted. Completely analogous to gfc_procedure_use. */ - -void -gfc_ppc_use (gfc_component *comp, gfc_actual_arglist **ap, locus *where) -{ - /* Warn about calls with an implicit interface. Special case - for calling a ISO_C_BINDING becase c_loc and c_funloc - are pseudo-unknown. */ - if (gfc_option.warn_implicit_interface - && comp->attr.if_source == IFSRC_UNKNOWN - && !comp->attr.is_iso_c) - gfc_warning ("Procedure pointer component '%s' called with an implicit " - "interface at %L", comp->name, where); - - if (comp->attr.if_source == IFSRC_UNKNOWN) - { - gfc_actual_arglist *a; - for (a = *ap; a; a = a->next) - { - /* Skip g77 keyword extensions like %VAL, %REF, %LOC. */ - if (a->name != NULL && a->name[0] != '%') - { - gfc_error("Keyword argument requires explicit interface " - "for procedure pointer component '%s' at %L", - comp->name, &a->expr->where); - break; - } - } - - return; - } - - if (!compare_actual_formal (ap, comp->ts.interface->formal, 0, - comp->attr.elemental, where)) - return; - - check_intents (comp->ts.interface->formal, *ap); - if (gfc_option.warn_aliasing) - check_some_aliasing (comp->ts.interface->formal, *ap); -} - - -/* Try if an actual argument list matches the formal list of a symbol, - respecting the symbol's attributes like ELEMENTAL. This is used for - GENERIC resolution. */ - -bool -gfc_arglist_matches_symbol (gfc_actual_arglist** args, gfc_symbol* sym) -{ - gfc_formal_arglist *dummy_args; - bool r; - - gcc_assert (sym->attr.flavor == FL_PROCEDURE); - - dummy_args = gfc_sym_get_dummy_args (sym); - - r = !sym->attr.elemental; - if (compare_actual_formal (args, dummy_args, r, !r, NULL)) - { - check_intents (dummy_args, *args); - if (gfc_option.warn_aliasing) - check_some_aliasing (dummy_args, *args); - return true; - } - - return false; -} - - -/* Given an interface pointer and an actual argument list, search for - a formal argument list that matches the actual. If found, returns - a pointer to the symbol of the correct interface. Returns NULL if - not found. */ - -gfc_symbol * -gfc_search_interface (gfc_interface *intr, int sub_flag, - gfc_actual_arglist **ap) -{ - gfc_symbol *elem_sym = NULL; - gfc_symbol *null_sym = NULL; - locus null_expr_loc; - gfc_actual_arglist *a; - bool has_null_arg = false; - - for (a = *ap; a; a = a->next) - if (a->expr && a->expr->expr_type == EXPR_NULL - && a->expr->ts.type == BT_UNKNOWN) - { - has_null_arg = true; - null_expr_loc = a->expr->where; - break; - } - - for (; intr; intr = intr->next) - { - if (intr->sym->attr.flavor == FL_DERIVED) - continue; - if (sub_flag && intr->sym->attr.function) - continue; - if (!sub_flag && intr->sym->attr.subroutine) - continue; - - if (gfc_arglist_matches_symbol (ap, intr->sym)) - { - if (has_null_arg && null_sym) - { - gfc_error ("MOLD= required in NULL() argument at %L: Ambiguity " - "between specific functions %s and %s", - &null_expr_loc, null_sym->name, intr->sym->name); - return NULL; - } - else if (has_null_arg) - { - null_sym = intr->sym; - continue; - } - - /* Satisfy 12.4.4.1 such that an elemental match has lower - weight than a non-elemental match. */ - if (intr->sym->attr.elemental) - { - elem_sym = intr->sym; - continue; - } - return intr->sym; - } - } - - if (null_sym) - return null_sym; - - return elem_sym ? elem_sym : NULL; -} - - -/* Do a brute force recursive search for a symbol. */ - -static gfc_symtree * -find_symtree0 (gfc_symtree *root, gfc_symbol *sym) -{ - gfc_symtree * st; - - if (root->n.sym == sym) - return root; - - st = NULL; - if (root->left) - st = find_symtree0 (root->left, sym); - if (root->right && ! st) - st = find_symtree0 (root->right, sym); - return st; -} - - -/* Find a symtree for a symbol. */ - -gfc_symtree * -gfc_find_sym_in_symtree (gfc_symbol *sym) -{ - gfc_symtree *st; - gfc_namespace *ns; - - /* First try to find it by name. */ - gfc_find_sym_tree (sym->name, gfc_current_ns, 1, &st); - if (st && st->n.sym == sym) - return st; - - /* If it's been renamed, resort to a brute-force search. */ - /* TODO: avoid having to do this search. If the symbol doesn't exist - in the symtree for the current namespace, it should probably be added. */ - for (ns = gfc_current_ns; ns; ns = ns->parent) - { - st = find_symtree0 (ns->sym_root, sym); - if (st) - return st; - } - gfc_internal_error ("Unable to find symbol %s", sym->name); - /* Not reached. */ -} - - -/* See if the arglist to an operator-call contains a derived-type argument - with a matching type-bound operator. If so, return the matching specific - procedure defined as operator-target as well as the base-object to use - (which is the found derived-type argument with operator). The generic - name, if any, is transmitted to the final expression via 'gname'. */ - -static gfc_typebound_proc* -matching_typebound_op (gfc_expr** tb_base, - gfc_actual_arglist* args, - gfc_intrinsic_op op, const char* uop, - const char ** gname) -{ - gfc_actual_arglist* base; - - for (base = args; base; base = base->next) - if (base->expr->ts.type == BT_DERIVED || base->expr->ts.type == BT_CLASS) - { - gfc_typebound_proc* tb; - gfc_symbol* derived; - gfc_try result; - - while (base->expr->expr_type == EXPR_OP - && base->expr->value.op.op == INTRINSIC_PARENTHESES) - base->expr = base->expr->value.op.op1; - - if (base->expr->ts.type == BT_CLASS) - { - if (CLASS_DATA (base->expr) == NULL - || !gfc_expr_attr (base->expr).class_ok) - continue; - derived = CLASS_DATA (base->expr)->ts.u.derived; - } - else - derived = base->expr->ts.u.derived; - - if (op == INTRINSIC_USER) - { - gfc_symtree* tb_uop; - - gcc_assert (uop); - tb_uop = gfc_find_typebound_user_op (derived, &result, uop, - false, NULL); - - if (tb_uop) - tb = tb_uop->n.tb; - else - tb = NULL; - } - else - tb = gfc_find_typebound_intrinsic_op (derived, &result, op, - false, NULL); - - /* This means we hit a PRIVATE operator which is use-associated and - should thus not be seen. */ - if (result == FAILURE) - tb = NULL; - - /* Look through the super-type hierarchy for a matching specific - binding. */ - for (; tb; tb = tb->overridden) - { - gfc_tbp_generic* g; - - gcc_assert (tb->is_generic); - for (g = tb->u.generic; g; g = g->next) - { - gfc_symbol* target; - gfc_actual_arglist* argcopy; - bool matches; - - gcc_assert (g->specific); - if (g->specific->error) - continue; - - target = g->specific->u.specific->n.sym; - - /* Check if this arglist matches the formal. */ - argcopy = gfc_copy_actual_arglist (args); - matches = gfc_arglist_matches_symbol (&argcopy, target); - gfc_free_actual_arglist (argcopy); - - /* Return if we found a match. */ - if (matches) - { - *tb_base = base->expr; - *gname = g->specific_st->name; - return g->specific; - } - } - } - } - - return NULL; -} - - -/* For the 'actual arglist' of an operator call and a specific typebound - procedure that has been found the target of a type-bound operator, build the - appropriate EXPR_COMPCALL and resolve it. We take this indirection over - type-bound procedures rather than resolving type-bound operators 'directly' - so that we can reuse the existing logic. */ - -static void -build_compcall_for_operator (gfc_expr* e, gfc_actual_arglist* actual, - gfc_expr* base, gfc_typebound_proc* target, - const char *gname) -{ - e->expr_type = EXPR_COMPCALL; - e->value.compcall.tbp = target; - e->value.compcall.name = gname ? gname : "$op"; - e->value.compcall.actual = actual; - e->value.compcall.base_object = base; - e->value.compcall.ignore_pass = 1; - e->value.compcall.assign = 0; - if (e->ts.type == BT_UNKNOWN - && target->function) - { - if (target->is_generic) - e->ts = target->u.generic->specific->u.specific->n.sym->ts; - else - e->ts = target->u.specific->n.sym->ts; - } -} - - -/* This subroutine is called when an expression is being resolved. - The expression node in question is either a user defined operator - or an intrinsic operator with arguments that aren't compatible - with the operator. This subroutine builds an actual argument list - corresponding to the operands, then searches for a compatible - interface. If one is found, the expression node is replaced with - the appropriate function call. We use the 'match' enum to specify - whether a replacement has been made or not, or if an error occurred. */ - -match -gfc_extend_expr (gfc_expr *e) -{ - gfc_actual_arglist *actual; - gfc_symbol *sym; - gfc_namespace *ns; - gfc_user_op *uop; - gfc_intrinsic_op i; - const char *gname; - - sym = NULL; - - actual = gfc_get_actual_arglist (); - actual->expr = e->value.op.op1; - - gname = NULL; - - if (e->value.op.op2 != NULL) - { - actual->next = gfc_get_actual_arglist (); - actual->next->expr = e->value.op.op2; - } - - i = fold_unary_intrinsic (e->value.op.op); - - if (i == INTRINSIC_USER) - { - for (ns = gfc_current_ns; ns; ns = ns->parent) - { - uop = gfc_find_uop (e->value.op.uop->name, ns); - if (uop == NULL) - continue; - - sym = gfc_search_interface (uop->op, 0, &actual); - if (sym != NULL) - break; - } - } - else - { - for (ns = gfc_current_ns; ns; ns = ns->parent) - { - /* Due to the distinction between '==' and '.eq.' and friends, one has - to check if either is defined. */ - switch (i) - { -#define CHECK_OS_COMPARISON(comp) \ - case INTRINSIC_##comp: \ - case INTRINSIC_##comp##_OS: \ - sym = gfc_search_interface (ns->op[INTRINSIC_##comp], 0, &actual); \ - if (!sym) \ - sym = gfc_search_interface (ns->op[INTRINSIC_##comp##_OS], 0, &actual); \ - break; - CHECK_OS_COMPARISON(EQ) - CHECK_OS_COMPARISON(NE) - CHECK_OS_COMPARISON(GT) - CHECK_OS_COMPARISON(GE) - CHECK_OS_COMPARISON(LT) - CHECK_OS_COMPARISON(LE) -#undef CHECK_OS_COMPARISON - - default: - sym = gfc_search_interface (ns->op[i], 0, &actual); - } - - if (sym != NULL) - break; - } - } - - /* TODO: Do an ambiguity-check and error if multiple matching interfaces are - found rather than just taking the first one and not checking further. */ - - if (sym == NULL) - { - gfc_typebound_proc* tbo; - gfc_expr* tb_base; - - /* See if we find a matching type-bound operator. */ - if (i == INTRINSIC_USER) - tbo = matching_typebound_op (&tb_base, actual, - i, e->value.op.uop->name, &gname); - else - switch (i) - { -#define CHECK_OS_COMPARISON(comp) \ - case INTRINSIC_##comp: \ - case INTRINSIC_##comp##_OS: \ - tbo = matching_typebound_op (&tb_base, actual, \ - INTRINSIC_##comp, NULL, &gname); \ - if (!tbo) \ - tbo = matching_typebound_op (&tb_base, actual, \ - INTRINSIC_##comp##_OS, NULL, &gname); \ - break; - CHECK_OS_COMPARISON(EQ) - CHECK_OS_COMPARISON(NE) - CHECK_OS_COMPARISON(GT) - CHECK_OS_COMPARISON(GE) - CHECK_OS_COMPARISON(LT) - CHECK_OS_COMPARISON(LE) -#undef CHECK_OS_COMPARISON - - default: - tbo = matching_typebound_op (&tb_base, actual, i, NULL, &gname); - break; - } - - /* If there is a matching typebound-operator, replace the expression with - a call to it and succeed. */ - if (tbo) - { - gfc_try result; - - gcc_assert (tb_base); - build_compcall_for_operator (e, actual, tb_base, tbo, gname); - - result = gfc_resolve_expr (e); - if (result == FAILURE) - return MATCH_ERROR; - - return MATCH_YES; - } - - /* Don't use gfc_free_actual_arglist(). */ - free (actual->next); - free (actual); - - return MATCH_NO; - } - - /* Change the expression node to a function call. */ - e->expr_type = EXPR_FUNCTION; - e->symtree = gfc_find_sym_in_symtree (sym); - e->value.function.actual = actual; - e->value.function.esym = NULL; - e->value.function.isym = NULL; - e->value.function.name = NULL; - e->user_operator = 1; - - if (gfc_resolve_expr (e) == FAILURE) - return MATCH_ERROR; - - return MATCH_YES; -} - - -/* Tries to replace an assignment code node with a subroutine call to - the subroutine associated with the assignment operator. Return - SUCCESS if the node was replaced. On FAILURE, no error is - generated. */ - -gfc_try -gfc_extend_assign (gfc_code *c, gfc_namespace *ns) -{ - gfc_actual_arglist *actual; - gfc_expr *lhs, *rhs; - gfc_symbol *sym; - const char *gname; - - gname = NULL; - - lhs = c->expr1; - rhs = c->expr2; - - /* Don't allow an intrinsic assignment to be replaced. */ - if (lhs->ts.type != BT_DERIVED && lhs->ts.type != BT_CLASS - && (rhs->rank == 0 || rhs->rank == lhs->rank) - && (lhs->ts.type == rhs->ts.type - || (gfc_numeric_ts (&lhs->ts) && gfc_numeric_ts (&rhs->ts)))) - return FAILURE; - - actual = gfc_get_actual_arglist (); - actual->expr = lhs; - - actual->next = gfc_get_actual_arglist (); - actual->next->expr = rhs; - - sym = NULL; - - for (; ns; ns = ns->parent) - { - sym = gfc_search_interface (ns->op[INTRINSIC_ASSIGN], 1, &actual); - if (sym != NULL) - break; - } - - /* TODO: Ambiguity-check, see above for gfc_extend_expr. */ - - if (sym == NULL) - { - gfc_typebound_proc* tbo; - gfc_expr* tb_base; - - /* See if we find a matching type-bound assignment. */ - tbo = matching_typebound_op (&tb_base, actual, - INTRINSIC_ASSIGN, NULL, &gname); - - /* If there is one, replace the expression with a call to it and - succeed. */ - if (tbo) - { - gcc_assert (tb_base); - c->expr1 = gfc_get_expr (); - build_compcall_for_operator (c->expr1, actual, tb_base, tbo, gname); - c->expr1->value.compcall.assign = 1; - c->expr1->where = c->loc; - c->expr2 = NULL; - c->op = EXEC_COMPCALL; - - /* c is resolved from the caller, so no need to do it here. */ - - return SUCCESS; - } - - free (actual->next); - free (actual); - return FAILURE; - } - - /* Replace the assignment with the call. */ - c->op = EXEC_ASSIGN_CALL; - c->symtree = gfc_find_sym_in_symtree (sym); - c->expr1 = NULL; - c->expr2 = NULL; - c->ext.actual = actual; - - return SUCCESS; -} - - -/* Make sure that the interface just parsed is not already present in - the given interface list. Ambiguity isn't checked yet since module - procedures can be present without interfaces. */ - -gfc_try -gfc_check_new_interface (gfc_interface *base, gfc_symbol *new_sym, locus loc) -{ - gfc_interface *ip; - - for (ip = base; ip; ip = ip->next) - { - if (ip->sym == new_sym) - { - gfc_error ("Entity '%s' at %L is already present in the interface", - new_sym->name, &loc); - return FAILURE; - } - } - - return SUCCESS; -} - - -/* Add a symbol to the current interface. */ - -gfc_try -gfc_add_interface (gfc_symbol *new_sym) -{ - gfc_interface **head, *intr; - gfc_namespace *ns; - gfc_symbol *sym; - - switch (current_interface.type) - { - case INTERFACE_NAMELESS: - case INTERFACE_ABSTRACT: - return SUCCESS; - - case INTERFACE_INTRINSIC_OP: - for (ns = current_interface.ns; ns; ns = ns->parent) - switch (current_interface.op) - { - case INTRINSIC_EQ: - case INTRINSIC_EQ_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_EQ], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_EQ_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - case INTRINSIC_NE: - case INTRINSIC_NE_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_NE], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_NE_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - case INTRINSIC_GT: - case INTRINSIC_GT_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_GT], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_GT_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - case INTRINSIC_GE: - case INTRINSIC_GE_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_GE], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_GE_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - case INTRINSIC_LT: - case INTRINSIC_LT_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_LT], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_LT_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - case INTRINSIC_LE: - case INTRINSIC_LE_OS: - if (gfc_check_new_interface (ns->op[INTRINSIC_LE], new_sym, - gfc_current_locus) == FAILURE - || gfc_check_new_interface (ns->op[INTRINSIC_LE_OS], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - break; - - default: - if (gfc_check_new_interface (ns->op[current_interface.op], new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - } - - head = ¤t_interface.ns->op[current_interface.op]; - break; - - case INTERFACE_GENERIC: - for (ns = current_interface.ns; ns; ns = ns->parent) - { - gfc_find_symbol (current_interface.sym->name, ns, 0, &sym); - if (sym == NULL) - continue; - - if (gfc_check_new_interface (sym->generic, new_sym, gfc_current_locus) - == FAILURE) - return FAILURE; - } - - head = ¤t_interface.sym->generic; - break; - - case INTERFACE_USER_OP: - if (gfc_check_new_interface (current_interface.uop->op, new_sym, - gfc_current_locus) == FAILURE) - return FAILURE; - - head = ¤t_interface.uop->op; - break; - - default: - gfc_internal_error ("gfc_add_interface(): Bad interface type"); - } - - intr = gfc_get_interface (); - intr->sym = new_sym; - intr->where = gfc_current_locus; - - intr->next = *head; - *head = intr; - - return SUCCESS; -} - - -gfc_interface * -gfc_current_interface_head (void) -{ - switch (current_interface.type) - { - case INTERFACE_INTRINSIC_OP: - return current_interface.ns->op[current_interface.op]; - break; - - case INTERFACE_GENERIC: - return current_interface.sym->generic; - break; - - case INTERFACE_USER_OP: - return current_interface.uop->op; - break; - - default: - gcc_unreachable (); - } -} - - -void -gfc_set_current_interface_head (gfc_interface *i) -{ - switch (current_interface.type) - { - case INTERFACE_INTRINSIC_OP: - current_interface.ns->op[current_interface.op] = i; - break; - - case INTERFACE_GENERIC: - current_interface.sym->generic = i; - break; - - case INTERFACE_USER_OP: - current_interface.uop->op = i; - break; - - default: - gcc_unreachable (); - } -} - - -/* Gets rid of a formal argument list. We do not free symbols. - Symbols are freed when a namespace is freed. */ - -void -gfc_free_formal_arglist (gfc_formal_arglist *p) -{ - gfc_formal_arglist *q; - - for (; p; p = q) - { - q = p->next; - free (p); - } -} - - -/* Check that it is ok for the type-bound procedure 'proc' to override the - procedure 'old', cf. F08:4.5.7.3. */ - -gfc_try -gfc_check_typebound_override (gfc_symtree* proc, gfc_symtree* old) -{ - locus where; - gfc_symbol *proc_target, *old_target; - unsigned proc_pass_arg, old_pass_arg, argpos; - gfc_formal_arglist *proc_formal, *old_formal; - bool check_type; - char err[200]; - - /* This procedure should only be called for non-GENERIC proc. */ - gcc_assert (!proc->n.tb->is_generic); - - /* If the overwritten procedure is GENERIC, this is an error. */ - if (old->n.tb->is_generic) - { - gfc_error ("Can't overwrite GENERIC '%s' at %L", - old->name, &proc->n.tb->where); - return FAILURE; - } - - where = proc->n.tb->where; - proc_target = proc->n.tb->u.specific->n.sym; - old_target = old->n.tb->u.specific->n.sym; - - /* Check that overridden binding is not NON_OVERRIDABLE. */ - if (old->n.tb->non_overridable) - { - gfc_error ("'%s' at %L overrides a procedure binding declared" - " NON_OVERRIDABLE", proc->name, &where); - return FAILURE; - } - - /* It's an error to override a non-DEFERRED procedure with a DEFERRED one. */ - if (!old->n.tb->deferred && proc->n.tb->deferred) - { - gfc_error ("'%s' at %L must not be DEFERRED as it overrides a" - " non-DEFERRED binding", proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is PURE, the overriding must be, too. */ - if (old_target->attr.pure && !proc_target->attr.pure) - { - gfc_error ("'%s' at %L overrides a PURE procedure and must also be PURE", - proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is ELEMENTAL, the overriding must be, too. If it - is not, the overriding must not be either. */ - if (old_target->attr.elemental && !proc_target->attr.elemental) - { - gfc_error ("'%s' at %L overrides an ELEMENTAL procedure and must also be" - " ELEMENTAL", proc->name, &where); - return FAILURE; - } - if (!old_target->attr.elemental && proc_target->attr.elemental) - { - gfc_error ("'%s' at %L overrides a non-ELEMENTAL procedure and must not" - " be ELEMENTAL, either", proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is a SUBROUTINE, the overriding must also be a - SUBROUTINE. */ - if (old_target->attr.subroutine && !proc_target->attr.subroutine) - { - gfc_error ("'%s' at %L overrides a SUBROUTINE and must also be a" - " SUBROUTINE", proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is a FUNCTION, the overriding must also be a - FUNCTION and have the same characteristics. */ - if (old_target->attr.function) - { - if (!proc_target->attr.function) - { - gfc_error ("'%s' at %L overrides a FUNCTION and must also be a" - " FUNCTION", proc->name, &where); - return FAILURE; - } - - if (check_result_characteristics (proc_target, old_target, - err, sizeof(err)) == FAILURE) - { - gfc_error ("Result mismatch for the overriding procedure " - "'%s' at %L: %s", proc->name, &where, err); - return FAILURE; - } - } - - /* If the overridden binding is PUBLIC, the overriding one must not be - PRIVATE. */ - if (old->n.tb->access == ACCESS_PUBLIC - && proc->n.tb->access == ACCESS_PRIVATE) - { - gfc_error ("'%s' at %L overrides a PUBLIC procedure and must not be" - " PRIVATE", proc->name, &where); - return FAILURE; - } - - /* Compare the formal argument lists of both procedures. This is also abused - to find the position of the passed-object dummy arguments of both - bindings as at least the overridden one might not yet be resolved and we - need those positions in the check below. */ - proc_pass_arg = old_pass_arg = 0; - if (!proc->n.tb->nopass && !proc->n.tb->pass_arg) - proc_pass_arg = 1; - if (!old->n.tb->nopass && !old->n.tb->pass_arg) - old_pass_arg = 1; - argpos = 1; - proc_formal = gfc_sym_get_dummy_args (proc_target); - old_formal = gfc_sym_get_dummy_args (old_target); - for ( ; proc_formal && old_formal; - proc_formal = proc_formal->next, old_formal = old_formal->next) - { - if (proc->n.tb->pass_arg - && !strcmp (proc->n.tb->pass_arg, proc_formal->sym->name)) - proc_pass_arg = argpos; - if (old->n.tb->pass_arg - && !strcmp (old->n.tb->pass_arg, old_formal->sym->name)) - old_pass_arg = argpos; - - /* Check that the names correspond. */ - if (strcmp (proc_formal->sym->name, old_formal->sym->name)) - { - gfc_error ("Dummy argument '%s' of '%s' at %L should be named '%s' as" - " to match the corresponding argument of the overridden" - " procedure", proc_formal->sym->name, proc->name, &where, - old_formal->sym->name); - return FAILURE; - } - - check_type = proc_pass_arg != argpos && old_pass_arg != argpos; - if (check_dummy_characteristics (proc_formal->sym, old_formal->sym, - check_type, err, sizeof(err)) == FAILURE) - { - gfc_error ("Argument mismatch for the overriding procedure " - "'%s' at %L: %s", proc->name, &where, err); - return FAILURE; - } - - ++argpos; - } - if (proc_formal || old_formal) - { - gfc_error ("'%s' at %L must have the same number of formal arguments as" - " the overridden procedure", proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is NOPASS, the overriding one must also be - NOPASS. */ - if (old->n.tb->nopass && !proc->n.tb->nopass) - { - gfc_error ("'%s' at %L overrides a NOPASS binding and must also be" - " NOPASS", proc->name, &where); - return FAILURE; - } - - /* If the overridden binding is PASS(x), the overriding one must also be - PASS and the passed-object dummy arguments must correspond. */ - if (!old->n.tb->nopass) - { - if (proc->n.tb->nopass) - { - gfc_error ("'%s' at %L overrides a binding with PASS and must also be" - " PASS", proc->name, &where); - return FAILURE; - } - - if (proc_pass_arg != old_pass_arg) - { - gfc_error ("Passed-object dummy argument of '%s' at %L must be at" - " the same position as the passed-object dummy argument of" - " the overridden procedure", proc->name, &where); - return FAILURE; - } - } - - return SUCCESS; -} |