libgo/runtime/go-type-identity.c

   1 /* go-type-identity.c -- hash and equality identity functions.
   2
   3    Copyright 2009 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 <stddef.h>
   8
   9 #include "runtime.h"
  10 #include "go-type.h"
  11
  12 /* The hash functions for types that can compare as identity is
  13    written in Go.  */
  14
  15 extern uintptr runtime_memhash(void *, uintptr, uintptr)
  16   __asm__ (GOSYM_PREFIX "runtime.memhash");
  17
  18 const FuncVal __go_type_hash_identity_descriptor =
  19   { (void *) runtime_memhash };
  20
  21 /* An identity equality function for a type.  This is used for types
  22    where we can check for equality by checking that the values have
  23    the same bits.  */
  24
  25 _Bool
  26 __go_type_equal_identity (const void *k1, const void *k2, uintptr_t key_size)
  27 {
  28   return __builtin_memcmp (k1, k2, key_size) == 0;
  29 }
  30
  31 const FuncVal __go_type_equal_identity_descriptor =
  32   { (void *) __go_type_equal_identity };