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/* go-type-interface.c -- hash and equality interface functions.

   Copyright 2009 The Go Authors. All rights reserved.

   Use of this source code is governed by a BSD-style

   license that can be found in the LICENSE file.  */

#include "interface.h"

#include "go-type.h"

/* A hash function for an interface.  */

uintptr_t

__go_type_hash_interface (const void *vval,

                          uintptr_t key_size __attribute__ ((unused)))

{

  const struct __go_interface *val;

  const struct __go_type_descriptor *descriptor;

  uintptr_t size;

  val = (const struct __go_interface *) vval;

  if (val->__methods == NULL)

    return 0;

  descriptor = (const struct __go_type_descriptor *) val->__methods[0];

  size = descriptor->__size;

  if (__go_is_pointer_type (descriptor))

    return descriptor->__hashfn (&val->__object, size);

  else

    return descriptor->__hashfn (val->__object, size);

}

/* An equality function for an interface.  */

_Bool

__go_type_equal_interface (const void *vv1, const void *vv2,

                           uintptr_t key_size __attribute__ ((unused)))

{

  const struct __go_interface *v1;

  const struct __go_interface *v2;

  const struct __go_type_descriptor* v1_descriptor;

  const struct __go_type_descriptor* v2_descriptor;

  v1 = (const struct __go_interface *) vv1;

  v2 = (const struct __go_interface *) vv2;

  if (v1->__methods == NULL || v2->__methods == NULL)

    return v1->__methods == v2->__methods;

  v1_descriptor = (const struct __go_type_descriptor *) v1->__methods[0];

  v2_descriptor = (const struct __go_type_descriptor *) v2->__methods[0];

  if (!__go_type_descriptors_equal (v1_descriptor, v2_descriptor))

    return 0;

  if (__go_is_pointer_type (v1_descriptor))

    return v1->__object == v2->__object;

  else

    return v1_descriptor->__equalfn (v1->__object, v2->__object,

                                     v1_descriptor->__size);

}