1 /* go-eface-compare.c -- compare two empty values. 2 3 Copyright 2010 The Go Authors. All rights reserved. 4 Use of this source code is governed by a BSD-style 5 license that can be found in the LICENSE file. */ 6 7 #include "runtime.h" 8 #include "go-type.h" 9 #include "interface.h" 10 11 /* Compare two interface values. Return 0 for equal, not zero for not 12 equal (return value is like strcmp). */ 13 14 intgo __go_empty_interface_compare(struct __go_empty_interface left,struct __go_empty_interface right)15__go_empty_interface_compare (struct __go_empty_interface left, 16 struct __go_empty_interface right) 17 { 18 const struct __go_type_descriptor *left_descriptor; 19 20 left_descriptor = left.__type_descriptor; 21 22 if (left_descriptor == NULL && right.__type_descriptor == NULL) 23 return 0; 24 if (left_descriptor == NULL || right.__type_descriptor == NULL) 25 return 1; 26 if (!__go_type_descriptors_equal (left_descriptor, 27 right.__type_descriptor)) 28 return 1; 29 if (__go_is_pointer_type (left_descriptor)) 30 return left.__object == right.__object ? 0 : 1; 31 if (!__go_call_equalfn (left_descriptor->__equalfn, left.__object, 32 right.__object, left_descriptor->__size)) 33 return 1; 34 return 0; 35 } 36