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/* go-interface-eface-compare.c -- compare non-empty and empty interface.
Copyright 2011 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 "runtime.h"
#include "go-type.h"
#include "interface.h"
/* Compare a non-empty interface value with an empty interface value.
Return 0 for equal, not zero for not equal (return value is like
strcmp). */
intgo
__go_interface_empty_compare (struct __go_interface left,
struct __go_empty_interface right)
{
const struct __go_type_descriptor *left_descriptor;
if (((uintptr_t) right.__type_descriptor & reflectFlags) != 0)
runtime_panicstring ("invalid interface value");
if (left.__methods == NULL && right.__type_descriptor == NULL)
return 0;
if (left.__methods == NULL || right.__type_descriptor == NULL)
return 1;
left_descriptor = left.__methods[0];
if (!__go_type_descriptors_equal (left_descriptor, right.__type_descriptor))
return 1;
if (__go_is_pointer_type (left_descriptor))
return left.__object == right.__object ? 0 : 1;
if (!left_descriptor->__equalfn (left.__object, right.__object,
left_descriptor->__size))
return 1;
return 0;
}
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