51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
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/* go-type-identity.c -- hash and equality identity functions.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include <stddef.h>
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#include "go-type.h"
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/* Typedefs for accesses of different sizes. */
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typedef int QItype __attribute__ ((mode (QI)));
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typedef int HItype __attribute__ ((mode (HI)));
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typedef int SItype __attribute__ ((mode (SI)));
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typedef int DItype __attribute__ ((mode (DI)));
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/* An identity hash function for a type. This is used for types where
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we can simply use the type value itself as a hash code. This is
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true of, e.g., integers and pointers. */
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size_t
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__go_type_hash_identity (const void *key, size_t key_size)
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{
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switch (key_size)
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{
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case 1:
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return *(const QItype *) key;
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case 2:
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return *(const HItype *) key;
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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return *(const SItype *) key;
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default:
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return *(const DItype *) key;
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}
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}
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/* An identity equality function for a type. This is used for types
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where we can check for equality by checking that the values have
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the same bits. */
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_Bool
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__go_type_equal_identity (const void *k1, const void *k2, size_t key_size)
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{
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return __builtin_memcmp (k1, k2, key_size) == 0;
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}
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