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/* go-check-interface.c -- check an interface type for a conversion

   Copyright 2010 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 "go-panic.h"

#include "interface.h"

/* Check that an interface type matches for a conversion to a

   non-interface type.  This panics if the types are bad.  The actual

   extraction of the object is inlined.  */

void

__go_check_interface_type (

    const struct __go_type_descriptor *lhs_descriptor,

    const struct __go_type_descriptor *rhs_descriptor,

    const struct __go_type_descriptor *rhs_inter_descriptor)

{

  if (rhs_descriptor == NULL)

    {

      struct __go_empty_interface panic_arg;

      newTypeAssertionError(NULL, NULL, lhs_descriptor, NULL, NULL,

                            lhs_descriptor->__reflection, NULL, &panic_arg);

      __go_panic(panic_arg);

    }

  if (lhs_descriptor != rhs_descriptor

      && !__go_type_descriptors_equal (lhs_descriptor, rhs_descriptor)

      && (lhs_descriptor->__code != GO_UNSAFE_POINTER

          || !__go_is_pointer_type (rhs_descriptor))

      && (rhs_descriptor->__code != GO_UNSAFE_POINTER

          || !__go_is_pointer_type (lhs_descriptor)))

    {

      struct __go_empty_interface panic_arg;

      newTypeAssertionError(rhs_inter_descriptor, rhs_descriptor,

                            lhs_descriptor,

                            rhs_inter_descriptor->__reflection,

                            rhs_descriptor->__reflection,

                            lhs_descriptor->__reflection,

                            NULL, &panic_arg);

      __go_panic(panic_arg);

    }

}