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/* Deal with interfaces.
Copyright (C) 2000-2022 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 "options.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;
}
/* Return the operator depending on the DTIO moded string. Note that
these are not operators in the normal sense and so have been placed
beyond GFC_INTRINSIC_END in gfortran.h:enum gfc_intrinsic_op. */
static gfc_intrinsic_op
dtio_op (char* mode)
{
if (strcmp (mode, "formatted") == 0)
return INTRINSIC_FORMATTED;
if (strcmp (mode, "unformatted") == 0)
return INTRINSIC_UNFORMATTED;
return INTRINSIC_NONE;
}
/* 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 (" read ( %n )", buffer) == MATCH_YES)
{
*op = dtio_op (buffer);
if (*op == INTRINSIC_FORMATTED)
{
strcpy (name, gfc_code2string (dtio_procs, DTIO_RF));
*type = INTERFACE_DTIO;
}
if (*op == INTRINSIC_UNFORMATTED)
{
strcpy (name, gfc_code2string (dtio_procs, DTIO_RUF));
*type = INTERFACE_DTIO;
}
if (*op != INTRINSIC_NONE)
return MATCH_YES;
}
if (gfc_match (" write ( %n )", buffer) == MATCH_YES)
{
*op = dtio_op (buffer);
if (*op == INTRINSIC_FORMATTED)
{
strcpy (name, gfc_code2string (dtio_procs, DTIO_WF));
*type = INTERFACE_DTIO;
}
if (*op == INTRINSIC_UNFORMATTED)
{
strcpy (name, gfc_code2string (dtio_procs, DTIO_WUF));
*type = INTERFACE_DTIO;
}
if (*op != INTRINSIC_NONE)
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_DTIO:
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))
return MATCH_ERROR;
if (sym->attr.dummy)
{
gfc_error ("Dummy procedure %qs 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"))
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;
if (strcmp(s2, "none") == 0)
gfc_error ("Expecting %<END INTERFACE OPERATOR (%s)%> "
"at %C", s1);
else
gfc_error ("Expecting %<END INTERFACE OPERATOR (%s)%> at %C, "
"but got %qs", 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_DTIO:
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;
}
/* Return whether the component was defined anonymously. */
static bool
is_anonymous_component (gfc_component *cmp)
{
/* Only UNION and MAP components are anonymous. In the case of a MAP,
the derived type symbol is FL_STRUCT and the component name looks like mM*.
This is the only case in which the second character of a component name is
uppercase. */
return cmp->ts.type == BT_UNION
|| (cmp->ts.type == BT_DERIVED
&& cmp->ts.u.derived->attr.flavor == FL_STRUCT
&& cmp->name[0] && cmp->name[1] && ISUPPER (cmp->name[1]));
}
/* Return whether the derived type was defined anonymously. */
static bool
is_anonymous_dt (gfc_symbol *derived)
{
/* UNION and MAP types are always anonymous. Otherwise, only nested STRUCTURE
types can be anonymous. For anonymous MAP/STRUCTURE, we have FL_STRUCT
and the type name looks like XX*. This is the only case in which the
second character of a type name is uppercase. */
return derived->attr.flavor == FL_UNION
|| (derived->attr.flavor == FL_STRUCT
&& derived->name[0] && derived->name[1] && ISUPPER (derived->name[1]));
}
/* Compare components according to 4.4.2 of the Fortran standard. */
static bool
compare_components (gfc_component *cmp1, gfc_component *cmp2,
gfc_symbol *derived1, gfc_symbol *derived2)
{
/* Compare names, but not for anonymous components such as UNION or MAP. */
if (!is_anonymous_component (cmp1) && !is_anonymous_component (cmp2)
&& strcmp (cmp1->name, cmp2->name) != 0)
return false;
if (cmp1->attr.access != cmp2->attr.access)
return false;
if (cmp1->attr.pointer != cmp2->attr.pointer)
return false;
if (cmp1->attr.dimension != cmp2->attr.dimension)
return false;
if (cmp1->attr.allocatable != cmp2->attr.allocatable)
return false;
if (cmp1->attr.dimension && gfc_compare_array_spec (cmp1->as, cmp2->as) == 0)
return false;
if (cmp1->ts.type == BT_CHARACTER && cmp2->ts.type == BT_CHARACTER)
{
gfc_charlen *l1 = cmp1->ts.u.cl;
gfc_charlen *l2 = cmp2->ts.u.cl;
if (l1 && l2 && l1->length && l2->length
&& l1->length->expr_type == EXPR_CONSTANT
&& l2->length->expr_type == EXPR_CONSTANT
&& gfc_dep_compare_expr (l1->length, l2->length) != 0)
return false;
}
/* Make sure that link lists do not put this function into an
endless recursive loop! */
if (!(cmp1->ts.type == BT_DERIVED && derived1 == cmp1->ts.u.derived)
&& !(cmp2->ts.type == BT_DERIVED && derived2 == cmp2->ts.u.derived)
&& !gfc_compare_types (&cmp1->ts, &cmp2->ts))
return false;
else if ( (cmp1->ts.type == BT_DERIVED && derived1 == cmp1->ts.u.derived)
&& !(cmp2->ts.type == BT_DERIVED && derived2 == cmp2->ts.u.derived))
return false;
else if (!(cmp1->ts.type == BT_DERIVED && derived1 == cmp1->ts.u.derived)
&& (cmp2->ts.type == BT_DERIVED && derived2 == cmp2->ts.u.derived))
return false;
return true;
}
/* Compare two union types by comparing the components of their maps.
Because unions and maps are anonymous their types get special internal
names; therefore the usual derived type comparison will fail on them.
Returns nonzero if equal, as with gfc_compare_derived_types. Also as with
gfc_compare_derived_types, 'equal' is closer to meaning 'duplicate
definitions' than 'equivalent structure'. */
static bool
compare_union_types (gfc_symbol *un1, gfc_symbol *un2)
{
gfc_component *map1, *map2, *cmp1, *cmp2;
gfc_symbol *map1_t, *map2_t;
if (un1->attr.flavor != FL_UNION || un2->attr.flavor != FL_UNION)
return false;
if (un1->attr.zero_comp != un2->attr.zero_comp)
return false;
if (un1->attr.zero_comp)
return true;
map1 = un1->components;
map2 = un2->components;
/* In terms of 'equality' here we are worried about types which are
declared the same in two places, not types that represent equivalent
structures. (This is common because of FORTRAN's weird scoping rules.)
Though two unions with their maps in different orders could be equivalent,
we will say they are not equal for the purposes of this test; therefore
we compare the maps sequentially. */
for (;;)
{
map1_t = map1->ts.u.derived;
map2_t = map2->ts.u.derived;
cmp1 = map1_t->components;
cmp2 = map2_t->components;
/* Protect against null components. */
if (map1_t->attr.zero_comp != map2_t->attr.zero_comp)
return false;
if (map1_t->attr.zero_comp)
return true;
for (;;)
{
/* No two fields will ever point to the same map type unless they are
the same component, because one map field is created with its type
declaration. Therefore don't worry about recursion here. */
/* TODO: worry about recursion into parent types of the unions? */
if (!compare_components (cmp1, cmp2, map1_t, map2_t))
return false;
cmp1 = cmp1->next;
cmp2 = cmp2->next;
if (cmp1 == NULL && cmp2 == NULL)
break;
if (cmp1 == NULL || cmp2 == NULL)
return false;
}
map1 = map1->next;
map2 = map2->next;
if (map1 == NULL && map2 == NULL)
break;
if (map1 == NULL || map2 == NULL)
return false;
}
return true;
}
/* Compare two derived types using the criteria in 4.4.2 of the standard,
recursing through gfc_compare_types for the components. */
bool
gfc_compare_derived_types (gfc_symbol *derived1, gfc_symbol *derived2)
{
gfc_component *cmp1, *cmp2;
if (derived1 == derived2)
return true;
if (!derived1 || !derived2)
gfc_internal_error ("gfc_compare_derived_types: invalid derived type");
if (derived1->attr.unlimited_polymorphic
&& derived2->attr.unlimited_polymorphic)
return true;
if (derived1->attr.unlimited_polymorphic
!= derived2->attr.unlimited_polymorphic)
return false;
/* Compare UNION types specially. */
if (derived1->attr.flavor == FL_UNION || derived2->attr.flavor == FL_UNION)
return compare_union_types (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 true;
/* Compare type via the rules of the standard. Both types must have the
SEQUENCE or BIND(C) attribute to be equal. We also compare types
recursively if they are class descriptors types or virtual tables types.
STRUCTUREs are special because they can be anonymous; therefore two
structures with different names may be equal. */
/* Compare names, but not for anonymous types such as UNION or MAP. */
if (!is_anonymous_dt (derived1) && !is_anonymous_dt (derived2)
&& strcmp (derived1->name, derived2->name) != 0)
return false;
if (derived1->component_access == ACCESS_PRIVATE
|| derived2->component_access == ACCESS_PRIVATE)
return false;
if (!(derived1->attr.sequence && derived2->attr.sequence)
&& !(derived1->attr.is_bind_c && derived2->attr.is_bind_c)
&& !(derived1->attr.is_class && derived2->attr.is_class)
&& !(derived1->attr.vtype && derived2->attr.vtype)
&& !(derived1->attr.pdt_type && derived2->attr.pdt_type))
return false;
/* Protect against null components. */
if (derived1->attr.zero_comp != derived2->attr.zero_comp)
return false;
if (derived1->attr.zero_comp)
return true;
cmp1 = derived1->components;
cmp2 = 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 (!compare_components (cmp1, cmp2, derived1, derived2))
return false;
cmp1 = cmp1->next;
cmp2 = cmp2->next;
if (cmp1 == NULL && cmp2 == NULL)
break;
if (cmp1 == NULL || cmp2 == NULL)
return false;
}
return true;
}
/* Compare two typespecs, recursively if necessary. */
bool
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 true;
/* Special case for our C interop types. FIXME: There should be a
better way of doing this. When ISO C binding is cleared up,
this can probably be removed. See PR 57048. */
if (((ts1->type == BT_INTEGER && ts2->type == BT_DERIVED)
|| (ts1->type == BT_DERIVED && ts2->type == BT_INTEGER))
&& ts1->u.derived && ts2->u.derived
&& ts1->u.derived == ts2->u.derived)
return true;
/* The _data component is not always present, therefore check for its
presence before assuming, that its derived->attr is available.
When the _data component is not present, then nevertheless the
unlimited_polymorphic flag may be set in the derived type's attr. */
if (ts1->type == BT_CLASS && ts1->u.derived->components
&& ((ts1->u.derived->attr.is_class
&& ts1->u.derived->components->ts.u.derived->attr
.unlimited_polymorphic)
|| ts1->u.derived->attr.unlimited_polymorphic))
return true;
/* F2003: C717 */
if (ts2->type == BT_CLASS && ts1->type == BT_DERIVED
&& ts2->u.derived->components
&& ((ts2->u.derived->attr.is_class
&& ts2->u.derived->components->ts.u.derived->attr
.unlimited_polymorphic)
|| ts2->u.derived->attr.unlimited_polymorphic)
&& (ts1->u.derived->attr.sequence || ts1->u.derived->attr.is_bind_c))
return true;
if (ts1->type != ts2->type
&& ((ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
|| (ts2->type != BT_DERIVED && ts2->type != BT_CLASS)))
return false;
if (ts1->type == BT_UNION)
return compare_union_types (ts1->u.derived, ts2->u.derived);
if (ts1->type != BT_DERIVED && ts1->type != BT_CLASS)
return (ts1->kind == ts2->kind);
/* Compare derived types. */
return gfc_type_compatible (ts1, ts2);
}
static bool
compare_type (gfc_symbol *s1, gfc_symbol *s2)
{
if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
return true;
return gfc_compare_types (&s1->ts, &s2->ts) || s2->ts.type == BT_ASSUMED;
}
static bool
compare_type_characteristics (gfc_symbol *s1, gfc_symbol *s2)
{
/* TYPE and CLASS of the same declared type are type compatible,
but have different characteristics. */
if ((s1->ts.type == BT_CLASS && s2->ts.type == BT_DERIVED)
|| (s1->ts.type == BT_DERIVED && s2->ts.type == BT_CLASS))
return false;
return compare_type (s1, s2);
}
static bool
compare_rank (gfc_symbol *s1, gfc_symbol *s2)
{
gfc_array_spec *as1, *as2;
int r1, r2;
if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
return true;
as1 = (s1->ts.type == BT_CLASS
&& !s1->ts.u.derived->attr.unlimited_polymorphic)
? CLASS_DATA (s1)->as : s1->as;
as2 = (s2->ts.type == BT_CLASS
&& !s2->ts.u.derived->attr.unlimited_polymorphic)
? CLASS_DATA (s2)->as : s2->as;
r1 = as1 ? as1->rank : 0;
r2 = as2 ? as2->rank : 0;
if (r1 != r2 && (!as2 || as2->type != AS_ASSUMED_RANK))
return false; /* Ranks differ. */
return true;
}
/* Given two symbols that are formal arguments, compare their ranks
and types. Returns true if they have the same rank and type,
false otherwise. */
static bool
compare_type_rank (gfc_symbol *s1, gfc_symbol *s2)
{
return compare_type (s1, s2) && compare_rank (s1, s2);
}
/* Given two symbols that are formal arguments, compare their types
and rank and their formal interfaces if they are both dummy
procedures. Returns true if the same, false if different. */
static bool
compare_type_rank_if (gfc_symbol *s1, gfc_symbol *s2)
{
if (s1 == NULL || s2 == NULL)
return (s1 == s2);
if (s1 == s2)
return true;
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 false;
/* 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 ? compare_type_rank (s1, s2) : false;
if (s2->attr.function == 0 && s2->attr.subroutine == 0)
return s2->attr.external ? compare_type_rank (s1, s2) : false;
/* Now the type of procedure has been identified. */
if (s1->attr.function != s2->attr.function
|| s1->attr.subroutine != s2->attr.subroutine)
return false;
if (s1->attr.function && !compare_type_rank (s1, s2))
return false;
/* Originally, gfortran recursed here to check the interfaces of passed
procedures. This is explicitly not required by the standard. */
return true;
}
/* 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 bool
count_types_test (gfc_formal_arglist *f1, gfc_formal_arglist *f2,
const char *p1, const char *p2)
{
int 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;
bool rc = false;
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 = true;
break;
}
k++;
}
free (arg);
return rc;
}
/* Returns true if two dummy arguments are distinguishable due to their POINTER
and ALLOCATABLE attributes according to F2018 section 15.4.3.4.5 (3).
The function is asymmetric wrt to the arguments s1 and s2 and should always
be called twice (with flipped arguments in the second call). */
static bool
compare_ptr_alloc(gfc_symbol *s1, gfc_symbol *s2)
{
/* Is s1 allocatable? */
const bool a1 = s1->ts.type == BT_CLASS ?
CLASS_DATA(s1)->attr.allocatable : s1->attr.allocatable;
/* Is s2 a pointer? */
const bool p2 = s2->ts.type == BT_CLASS ?
CLASS_DATA(s2)->attr.class_pointer : s2->attr.pointer;
return a1 && p2 && (s2->attr.intent != INTENT_IN);
}
/* 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 bool
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 || 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)
&& (compare_ptr_alloc(f1->sym, f2->sym)
|| compare_ptr_alloc(f2->sym, f1->sym))))
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)
&& (compare_ptr_alloc(sym, g->sym)
|| compare_ptr_alloc(g->sym, sym))))
return true;
}
next:
if (f1 != NULL)
f1 = f1->next;
if (f2 != NULL)
f2 = f2->next;
}
return false;
}
static int
symbol_rank (gfc_symbol *sym)
{
gfc_array_spec *as = NULL;
if (sym->ts.type == BT_CLASS && CLASS_DATA (sym))
as = CLASS_DATA (sym)->as;
else
as = sym->as;
return as ? as->rank : 0;
}
/* Check if the characteristics of two dummy arguments match,
cf. F08:12.3.2. */
bool
gfc_check_dummy_characteristics (gfc_symbol *s1, gfc_symbol *s2,
bool type_must_agree, char *errmsg,
int err_len)
{
if (s1 == NULL || s2 == NULL)
return s1 == s2 ? true : false;
/* Check type and rank. */
if (type_must_agree)
{
if (!compare_type_characteristics (s1, s2)
|| !compare_type_characteristics (s2, s1))
{
snprintf (errmsg, err_len, "Type mismatch in argument '%s' (%s/%s)",
s1->name, gfc_dummy_typename (&s1->ts),
gfc_dummy_typename (&s2->ts));
return false;
}
if (!compare_rank (s1, s2))
{
snprintf (errmsg, err_len, "Rank mismatch in argument '%s' (%i/%i)",
s1->name, symbol_rank (s1), symbol_rank (s2));
return false;
}
}
/* Check INTENT. */
if (s1->attr.intent != s2->attr.intent && !s1->attr.artificial
&& !s2->attr.artificial)
{
snprintf (errmsg, err_len, "INTENT mismatch in argument '%s'",
s1->name);
return false;
}
/* Check OPTIONAL attribute. */
if (s1->attr.optional != s2->attr.optional)
{
snprintf (errmsg, err_len, "OPTIONAL mismatch in argument '%s'",
s1->name);
return false;
}
/* Check ALLOCATABLE attribute. */
if (s1->attr.allocatable != s2->attr.allocatable)
{
snprintf (errmsg, err_len, "ALLOCATABLE mismatch in argument '%s'",
s1->name);
return false;
}
/* Check POINTER attribute. */
if (s1->attr.pointer != s2->attr.pointer)
{
snprintf (errmsg, err_len, "POINTER mismatch in argument '%s'",
s1->name);
return false;
}
/* Check TARGET attribute. */
if (s1->attr.target != s2->attr.target)
{
snprintf (errmsg, err_len, "TARGET mismatch in argument '%s'",
s1->name);
return false;
}
/* Check ASYNCHRONOUS attribute. */
if (s1->attr.asynchronous != s2->attr.asynchronous)
{
snprintf (errmsg, err_len, "ASYNCHRONOUS mismatch in argument '%s'",
s1->name);
return false;
}
/* Check CONTIGUOUS attribute. */
if (s1->attr.contiguous != s2->attr.contiguous)
{
snprintf (errmsg, err_len, "CONTIGUOUS mismatch in argument '%s'",
s1->name);
return false;
}
/* Check VALUE attribute. */
if (s1->attr.value != s2->attr.value)
{
snprintf (errmsg, err_len, "VALUE mismatch in argument '%s'",
s1->name);
return false;
}
/* Check VOLATILE attribute. */
if (s1->attr.volatile_ != s2->attr.volatile_)
{
snprintf (errmsg, err_len, "VOLATILE mismatch in argument '%s'",
s1->name);
return false;
}
/* 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 false;
}
}
/* 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 false;
case -2:
/* FIXME: Implement a warning for this case.
gfc_warning (0, "Possible character length mismatch in argument %qs",
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;
/* Sometimes the ambiguity between deferred shape and assumed shape
does not get resolved in module procedures, where the only explicit
declaration of the dummy is in the interface. */
if (s1->ns->proc_name && s1->ns->proc_name->attr.module_procedure
&& s1->as->type == AS_ASSUMED_SHAPE
&& s2->as->type == AS_DEFERRED)
{
s2->as->type = AS_ASSUMED_SHAPE;
for (i = 0; i < s2->as->rank; i++)
if (s1->as->lower[i] != NULL)
s2->as->lower[i] = gfc_copy_expr (s1->as->lower[i]);
}
if (s1->as->type != s2->as->type)
{
snprintf (errmsg, err_len, "Shape mismatch in argument '%s'",
s1->name);
return false;
}
if (s1->as->corank != s2->as->corank)
{
snprintf (errmsg, err_len, "Corank mismatch in argument '%s' (%i/%i)",
s1->name, s1->as->corank, s2->as->corank);
return false;
}
if (s1->as->type == AS_EXPLICIT)
for (i = 0; i < s1->as->rank + MAX (0, s1->as->corank-1); 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:
if (i < s1->as->rank)
snprintf (errmsg, err_len, "Shape mismatch in dimension %i of"
" argument '%s'", i + 1, s1->name);
else
snprintf (errmsg, err_len, "Shape mismatch in codimension %i "
"of argument '%s'", i - s1->as->rank + 1, s1->name);
return false;
case -2:
/* FIXME: Implement a warning for this case.
gfc_warning (0, "Possible shape mismatch in argument %qs",
s1->name);*/
break;
case 0:
break;
default:
gfc_internal_error ("check_dummy_characteristics: Unexpected "
"result %i of gfc_dep_compare_expr",
compval);
break;
}
}
}
return true;
}
/* Check if the characteristics of two function results match,
cf. F08:12.3.3. */
bool
gfc_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 true;
/* Check type and rank. */
if (!compare_type_characteristics (r1, r2))
{
snprintf (errmsg, err_len, "Type mismatch in function result (%s/%s)",
gfc_typename (&r1->ts), gfc_typename (&r2->ts));
return false;
}
if (!compare_rank (r1, r2))
{
snprintf (errmsg, err_len, "Rank mismatch in function result (%i/%i)",
symbol_rank (r1), symbol_rank (r2));
return false;
}
/* Check ALLOCATABLE attribute. */
if (r1->attr.allocatable != r2->attr.allocatable)
{
snprintf (errmsg, err_len, "ALLOCATABLE attribute mismatch in "
"function result");
return false;
}
/* Check POINTER attribute. */
if (r1->attr.pointer != r2->attr.pointer)
{
snprintf (errmsg, err_len, "POINTER attribute mismatch in "
"function result");
return false;
}
/* Check CONTIGUOUS attribute. */
if (r1->attr.contiguous != r2->attr.contiguous)
{
snprintf (errmsg, err_len, "CONTIGUOUS attribute mismatch in "
"function result");
return false;
}
/* 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 false;
}
/* 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 false;
}
if (r1->ts.u.cl->length && r2->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 false;
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 false;
}
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 false;
case -2:
/* FIXME: Implement a warning for this case.
gfc_warning (0, "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 true;
}
/* 'Compare' two formal interfaces associated with a pair of symbols.
We return true 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). */
bool
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,
bool *bad_result_characteristics)
{
gfc_formal_arglist *f1, *f2;
gcc_assert (name2 != NULL);
if (bad_result_characteristics)
*bad_result_characteristics = false;
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 false;
}
if (s1->attr.subroutine && s2->attr.function)
{
if (errmsg != NULL)
snprintf (errmsg, err_len, "'%s' is not a subroutine", name2);
return false;
}
/* 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 (!gfc_check_result_characteristics (s1, s2, errmsg, err_len)
|| !gfc_check_result_characteristics (s2, s1, errmsg, err_len))
{
if (bad_result_characteristics)
*bad_result_characteristics = true;
return false;
}
}
if (s1->attr.pure && !s2->attr.pure)
{
snprintf (errmsg, err_len, "Mismatch in PURE attribute");
return false;
}
if (s1->attr.elemental && !s2->attr.elemental)
{
snprintf (errmsg, err_len, "Mismatch in ELEMENTAL attribute");
return false;
}
}
if (s1->attr.if_source == IFSRC_UNKNOWN
|| s2->attr.if_source == IFSRC_UNKNOWN)
return true;
f1 = gfc_sym_get_dummy_args (s1);
f2 = gfc_sym_get_dummy_args (s2);
/* Special case: No arguments. */
if (f1 == NULL && f2 == NULL)
return true;
if (generic_flag)
{
if (count_types_test (f1, f2, p1, p2)
|| count_types_test (f2, f1, p2, p1))
return false;
/* Special case: alternate returns. If both f1->sym and f2->sym are
NULL, then the leading formal arguments are alternate returns.
The previous conditional should catch argument lists with
different number of argument. */
if (f1 && f1->sym == NULL && f2 && f2->sym == NULL)
return true;
if (generic_correspondence (f1, f2, p1, p2)
|| generic_correspondence (f2, f1, p2, p1))
return false;
}
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 (; f1 || f2; f1 = f1->next, f2 = f2->next)
{
/* Check existence. */
if (f1 == NULL || f2 == NULL)
{
if (errmsg != NULL)
snprintf (errmsg, err_len, "'%s' has the wrong number of "
"arguments", name2);
return false;
}
if (strict_flag)
{
/* Check all characteristics. */
if (!gfc_check_dummy_characteristics (f1->sym, f2->sym, true,
errmsg, err_len))
return false;
}
else
{
/* Operators: Only check type and rank of arguments. */
if (!compare_type (f2->sym, f1->sym))
{
if (errmsg != NULL)
snprintf (errmsg, err_len, "Type mismatch in argument '%s' "
"(%s/%s)", f1->sym->name,
gfc_typename (&f1->sym->ts),
gfc_typename (&f2->sym->ts));
return false;
}
if (!compare_rank (f2->sym, f1->sym))
{
if (errmsg != NULL)
snprintf (errmsg, err_len, "Rank mismatch in argument "
"'%s' (%i/%i)", f1->sym->name,
symbol_rank (f1->sym), symbol_rank (f2->sym));
return false;
}
if ((gfc_option.allow_std & GFC_STD_F2008)
&& (compare_ptr_alloc(f1->sym, f2->sym)
|| compare_ptr_alloc(f2->sym, f1->sym)))
{
if (errmsg != NULL)
snprintf (errmsg, err_len, "Mismatching POINTER/ALLOCATABLE "
"attribute in argument '%s' ", f1->sym->name);
return false;
}
}
}
return true;
}
/* 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 true if
something goes wrong. */
static bool
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)
&& !gfc_fl_struct (p->sym->attr.flavor))
{
const char *guessed
= gfc_lookup_function_fuzzy (p->sym->name, p->sym->ns->sym_root);
if (p->sym->attr.external)
if (guessed)
gfc_error ("Procedure %qs in %s at %L has no explicit interface"
"; did you mean %qs?",
p->sym->name, interface_name, &p->sym->declared_at,
guessed);
else
gfc_error ("Procedure %qs in %s at %L has no explicit interface",
p->sym->name, interface_name, &p->sym->declared_at);
else
if (guessed)
gfc_error ("Procedure %qs in %s at %L is neither function nor "
"subroutine; did you mean %qs?", p->sym->name,
interface_name, &p->sym->declared_at, guessed);
else
gfc_error ("Procedure %qs in %s at %L is neither function nor "
"subroutine", p->sym->name, interface_name,
&p->sym->declared_at);
return true;
}
/* Verify that procedures are either all SUBROUTINEs or all FUNCTIONs. */
if ((psave->sym->attr.function && !p->sym->attr.function
&& !gfc_fl_struct (p->sym->attr.flavor))
|| (psave->sym->attr.subroutine && !p->sym->attr.subroutine))
{
if (!gfc_fl_struct (p->sym->attr.flavor))
gfc_error ("In %s at %L procedures must be either all SUBROUTINEs"
" or all FUNCTIONs", interface_name,
&p->sym->declared_at);
else if (p->sym->attr.flavor == FL_DERIVED)
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 true;
}
/* F2003, C1207. F2008, C1207. */
if (p->sym->attr.proc == PROC_INTERNAL
&& !gfc_notify_std (GFC_STD_F2008, "Internal procedure "
"%qs in %s at %L", p->sym->name,
interface_name, &p->sym->declared_at))
return true;
}
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 false;
}
/* Check lists of interfaces to make sure that no two interfaces are
ambiguous. Duplicate interfaces (from the same symbol) are OK here. */
static bool
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 (!gfc_fl_struct (p->sym->attr.flavor)
&& !gfc_fl_struct (q->sym->attr.flavor)
&& gfc_compare_interfaces (p->sym, q->sym, q->sym->name,
generic_flag, 0, NULL, 0, NULL, NULL))
{
if (referenced)
gfc_error ("Ambiguous interfaces in %s for %qs at %L "
"and %qs at %L", interface_name,
q->sym->name, &q->sym->declared_at,
p->sym->name, &p->sym->declared_at);
else if (!p->sym->attr.use_assoc && q->sym->attr.use_assoc)
gfc_warning (0, "Ambiguous interfaces in %s for %qs at %L "
"and %qs at %L", interface_name,
q->sym->name, &q->sym->declared_at,
p->sym->name, &p->sym->declared_at);
else
gfc_warning (0, "Although not referenced, %qs has ambiguous "
"interfaces at %L", interface_name, &p->where);
return true;
}
}
return false;
}
/* 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)
{
/* Provide sufficient space to hold "generic interface 'symbol.symbol'". */
char interface_name[2*GFC_MAX_SYMBOL_LEN+2 + sizeof("generic interface ''")];
gfc_interface *p;
if (sym->ns != gfc_current_ns)
return;
if (sym->generic != NULL)
{
size_t len = strlen (sym->name) + sizeof("generic interface ''");
gcc_assert (len < sizeof (interface_name));
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.module_procedure
&& (p->sym->attr.if_source != IFSRC_DECL
|| p->sym->attr.procedure))
{
gfc_error ("%qs 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[GFC_MAX_SYMBOL_LEN + sizeof("operator interface ''")];
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[GFC_MAX_SYMBOL_LEN + sizeof("intrinsic '' operator")];
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;
}
/* 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 true if compatible, zero if not compatible. */
static bool
compare_allocatable (gfc_symbol *formal, gfc_expr *actual)
{
if (formal->attr.allocatable
|| (formal->ts.type == BT_CLASS && CLASS_DATA (formal)->attr.allocatable))
{
symbol_attribute attr = gfc_expr_attr (actual);
if (actual->ts.type == BT_CLASS && !attr.class_ok)
return true;
else if (!attr.allocatable)
return false;
}
return true;
}
/* 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, locus *where_formal)
{
/* TS 29113, C407b. */
if (where_formal == NULL)
{
if (rank2 == -1)
gfc_error ("The assumed-rank array at %L requires that the dummy "
"argument %qs has assumed-rank", where, name);
else if (rank1 == 0)
gfc_error_opt (0, "Rank mismatch in argument %qs "
"at %L (scalar and rank-%d)", name, where, rank2);
else if (rank2 == 0)
gfc_error_opt (0, "Rank mismatch in argument %qs "
"at %L (rank-%d and scalar)", name, where, rank1);
else
gfc_error_opt (0, "Rank mismatch in argument %qs "
"at %L (rank-%d and rank-%d)", name, where, rank1,
rank2);
}
else
{
if (rank2 == -1)
/* This is an assumed rank-actual passed to a function without
an explicit interface, which is already diagnosed in
gfc_procedure_use. */
return;
if (rank1 == 0)
gfc_error_opt (0, "Rank mismatch between actual argument at %L "
"and actual argument at %L (scalar and rank-%d)",
where, where_formal, rank2);
else if (rank2 == 0)
gfc_error_opt (0, "Rank mismatch between actual argument at %L "
"and actual argument at %L (rank-%d and scalar)",
where, where_formal, rank1);
else
gfc_error_opt (0, "Rank mismatch between actual argument at %L "
"and actual argument at %L (rank-%d and rank-%d)", where,
where_formal, rank1, rank2);
}
}
/* Under certain conditions, a scalar actual argument can be passed
to an array dummy argument - see F2018, 15.5.2.4, paragraph 14.
This function returns true for these conditions so that an error
or warning for this can be suppressed later. Always return false
for expressions with rank > 0. */
bool
maybe_dummy_array_arg (gfc_expr *e)
{
gfc_symbol *s;
gfc_ref *ref;
bool array_pointer = false;
bool assumed_shape = false;
bool scalar_ref = true;
if (e->rank > 0)
return false;
if (e->ts.type == BT_CHARACTER && e->ts.kind == 1)
return true;
/* If this comes from a constructor, it has been an array element
originally. */
if (e->expr_type == EXPR_CONSTANT)
return e->from_constructor;
if (e->expr_type != EXPR_VARIABLE)
return false;
s = e->symtree->n.sym;
if (s->attr.dimension)
{
scalar_ref = false;
array_pointer = s->attr.pointer;
}
if (s->as && s->as->type == AS_ASSUMED_SHAPE)
assumed_shape = true;
for (ref=e->ref; ref; ref=ref->next)
{
if (ref->type == REF_COMPONENT)
{
symbol_attribute *attr;
attr = &ref->u.c.component->attr;
if (attr->dimension)
{
array_pointer = attr->pointer;
assumed_shape = false;
scalar_ref = false;
}
else
scalar_ref = true;
}
}
return !(scalar_ref || array_pointer || assumed_shape);
}
/* Given a symbol of a formal argument list and an expression, see if
the two are compatible as arguments. Returns true if
compatible, false if not compatible. */
static bool
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;
char err[200];
gfc_component *ppc;
bool codimension = false;
/* 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 true;
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 true;
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)
{
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 false;
}
if (!gfc_compare_interfaces (formal, act_sym, act_sym->name, 0, 1, err,
sizeof(err), NULL, NULL))
{
if (where)
gfc_error_opt (0, "Interface mismatch in dummy procedure %qs at %L:"
" %s", formal->name, &actual->where, err);
return false;
}
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))
return false;
}
else if (formal->attr.subroutine && !act_sym->attr.subroutine)
gfc_add_subroutine (&act_sym->attr, act_sym->name,
&act_sym->declared_at);
return true;
}
ppc = gfc_get_proc_ptr_comp (actual);
if (ppc && ppc->ts.interface)
{
if (!gfc_compare_interfaces (formal, ppc->ts.interface, ppc->name, 0, 1,
err, sizeof(err), NULL, NULL))
{
if (where)
gfc_error_opt (0, "Interface mismatch in dummy procedure %qs at %L:"
" %s", formal->name, &actual->where, err);
return false;
}
}
/* F2008, C1241. */
if (formal->attr.pointer && formal->attr.contiguous
&& !gfc_is_simply_contiguous (actual, true, false))
{
if (where)
gfc_error ("Actual argument to contiguous pointer dummy %qs at %L "
"must be simply contiguous", formal->name, &actual->where);
return false;
}
symbol_attribute actual_attr = gfc_expr_attr (actual);
if (actual->ts.type == BT_CLASS && !actual_attr.class_ok)
return true;
if ((actual->expr_type != EXPR_NULL || actual->ts.type != BT_UNKNOWN)
&& actual->ts.type != BT_HOLLERITH
&& formal->ts.type != BT_ASSUMED
&& !(formal->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
&& !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)
{
if (formal->attr.artificial)
{
if (!flag_allow_argument_mismatch || !formal->error)
gfc_error_opt (0, "Type mismatch between actual argument at %L "
"and actual argument at %L (%s/%s).",
&actual->where,
&formal->declared_at,
gfc_typename (actual),
gfc_dummy_typename (&formal->ts));
formal->error = 1;
}
else
gfc_error_opt (0, "Type mismatch in argument %qs at %L; passed %s "
"to %s", formal->name, where, gfc_typename (actual),
gfc_dummy_typename (&formal->ts));
}
return false;
}
if (actual->ts.type == BT_ASSUMED && formal->ts.type != BT_ASSUMED)
{
if (where)
gfc_error ("Assumed-type actual argument at %L requires that dummy "
"argument %qs is of assumed type", &actual->where,
formal->name);
return false;
}
/* TS29113 C407c; F2018 C711. */
if (actual->ts.type == BT_ASSUMED
&& symbol_rank (formal) == -1
&& actual->rank != -1
&& !(actual->symtree->n.sym->as
&& actual->symtree->n.sym->as->type == AS_ASSUMED_SHAPE))
{
if (where)
gfc_error ("Assumed-type actual argument at %L corresponding to "
"assumed-rank dummy argument %qs must be "
"assumed-shape or assumed-rank",
&actual->where, formal->name);
return false;
}
/* F2008, 12.5.2.5; IR F08/0073. */
if (formal->ts.type == BT_CLASS && formal->attr.class_ok
&& 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 %qs at %L must be polymorphic",
formal->name, &actual->where);
return false;
}
if ((!UNLIMITED_POLY (formal) || !UNLIMITED_POLY(actual))
&& !gfc_compare_derived_types (CLASS_DATA (actual)->ts.u.derived,
CLASS_DATA (formal)->ts.u.derived))
{
if (where)
gfc_error ("Actual argument to %qs at %L must have the same "
"declared type", formal->name, &actual->where);
return false;
}
}
/* 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 %qs 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 false;
}
if (formal->ts.type == BT_CLASS && formal->attr.class_ok)
codimension = CLASS_DATA (formal)->attr.codimension;
else
codimension = formal->attr.codimension;
if (codimension && !gfc_is_coarray (actual))
{
if (where)
gfc_error ("Actual argument to %qs at %L must be a coarray",
formal->name, &actual->where);
return false;
}
if (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 %qs 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 false;
}
}
if (codimension)
{
/* F2008, 12.5.2.8 + Corrig 2 (IR F08/0048). */
/* F2018, 12.5.2.8. */
if (formal->attr.dimension
&& (formal->attr.contiguous || formal->as->type != AS_ASSUMED_SHAPE)
&& actual_attr.dimension
&& !gfc_is_simply_contiguous (actual, true, true))
{
if (where)
gfc_error ("Actual argument to %qs at %L must be simply "
"contiguous or an element of such an array",
formal->name, &actual->where);
return false;
}
/* 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 %qs at %L, "
"which is LOCK_TYPE or has a LOCK_TYPE component",
formal->name, &actual->where);
return false;
}
/* TS18508, C702/C703. */
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_EVENT_TYPE)
|| formal->attr.event_comp))
{
if (where)
gfc_error ("Actual argument to non-INTENT(INOUT) dummy %qs at %L, "
"which is EVENT_TYPE or has a EVENT_TYPE component",
formal->name, &actual->where);
return false;
}
}
/* 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 && formal->as
&& !gfc_is_simply_contiguous (actual, true, false)
&& ((formal->as->type != AS_ASSUMED_SHAPE
&& formal->as->type != AS_ASSUMED_RANK && !formal->attr.pointer)
|| formal->attr.contiguous))
{
if (where)
gfc_error ("Dummy argument %qs has to be a pointer, assumed-shape or "
"assumed-rank array without CONTIGUOUS attribute - as actual"
" argument at %L is not simply contiguous and both are "
"ASYNCHRONOUS or VOLATILE", formal->name, &actual->where);
return false;
}
if (formal->attr.allocatable && !codimension
&& actual_attr.codimension)
{
if (formal->attr.intent == INTENT_OUT)
{
if (where)
gfc_error ("Passing coarray at %L to allocatable, noncoarray, "
"INTENT(OUT) dummy argument %qs", &actual->where,
formal->name);
return false;
}
else if (warn_surprising && where && formal->attr.intent != INTENT_IN)
gfc_warning (OPT_Wsurprising,
"Passing coarray at %L to allocatable, noncoarray dummy "
"argument %qs, 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 true;
rank_check = where != NULL && !is_elemental && formal->as
&& (formal->as->type == AS_ASSUMED_SHAPE
|| formal->as->type == AS_DEFERRED)
&& actual->expr_type != EXPR_NULL;
/* Skip rank checks for NO_ARG_CHECK. */
if (formal->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK))
return true;
/* 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))
/* Assumed-rank actual argument; F2018 C838. */
|| actual->rank == -1)
{
if (where
&& (!formal->attr.artificial || (!formal->maybe_array
&& !maybe_dummy_array_arg (actual))))
{
locus *where_formal;
if (formal->attr.artificial)
where_formal = &formal->declared_at;
else
where_formal = NULL;
argument_rank_mismatch (formal->name, &actual->where,
symbol_rank (formal), actual->rank,
where_formal);
}
return false;
}
else if (actual->rank != 0 && (is_elemental || formal->attr.dimension))
return true;
/* 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.
- (F2018) if the dummy argument is type(*). */
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 %qs "
"at %L", formal->name, &actual->where);
return false;
}
if (actual->expr_type != EXPR_NULL && ref && actual->ts.type != BT_CHARACTER
&& (is_pointer || ref->u.ar.as->type == AS_ASSUMED_SHAPE))
{
if (where)
{
if (formal->attr.artificial)
gfc_error ("Element of assumed-shape or pointer array "
"as actual argument at %L cannot correspond to "
"actual argument at %L",
&actual->where, &formal->declared_at);
else
gfc_error ("Element of assumed-shape or pointer "
"array passed to array dummy argument %qs at %L",
formal->name, &actual->where);
}
return false;
}
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 "
"%qs at %L", formal->name, &actual->where);
return false;
}
if (where && (gfc_option.allow_std & GFC_STD_F2003) == 0)
{
gfc_error ("Fortran 2003: Scalar CHARACTER actual argument with "
"array dummy argument %qs at %L",
formal->name, &actual->where);
return false;
}
else
return ((gfc_option.allow_std & GFC_STD_F2003) != 0);
}
if (ref == NULL && actual->expr_type != EXPR_NULL)
{
if (actual->rank == 0
&& formal->ts.type == BT_ASSUMED
&& formal->as
&& formal->as->type == AS_ASSUMED_SIZE)
/* This is new in F2018, type(*) is new in TS29113, but gfortran does
not differentiate. Thus, if type(*) exists, it is valid;
otherwise, type(*) is already rejected. */
return true;
if (where
&& (!formal->attr.artificial || (!formal->maybe_array
&& !maybe_dummy_array_arg (actual))))
{
locus *where_formal;
if (formal->attr.artificial)
where_formal = &formal->declared_at;
else
where_formal = NULL;
argument_rank_mismatch (formal->name, &actual->where,
symbol_rank (formal), actual->rank,
where_formal);
}
return false;
}
return true;
}
/* 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
&& sym->ts.u.cl->length->ts.type == BT_INTEGER)
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
|| sym->as->upper[i]->ts.type != BT_INTEGER
|| sym->as->lower[i]->ts.type != BT_INTEGER)
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->lower[i]->ts.type == BT_INTEGER
&& ref->u.ar.as->upper[i]->expr_type == EXPR_CONSTANT
&& ref->u.ar.as->upper[i]->ts.type == BT_INTEGER)
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->