88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* map.h -- the map type for Go.
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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 <stdint.h>
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#include "go-type.h"
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/* A map descriptor is what we need to manipulate the map. This is
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constant for a given map type. */
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struct __go_map_descriptor
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{
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/* A pointer to the type descriptor for the type of the map itself. */
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const struct __go_map_type *__map_descriptor;
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/* A map entry is a struct with three fields:
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map_entry_type *next_entry;
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key_type key;
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value_type value;
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This is the size of that struct. */
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uintptr_t __entry_size;
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/* The offset of the key field in a map entry struct. */
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uintptr_t __key_offset;
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/* The offset of the value field in a map entry struct (the value
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field immediately follows the key field, but there may be some
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bytes inserted for alignment). */
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uintptr_t __val_offset;
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};
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struct __go_map
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{
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/* The constant descriptor for this map. */
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const struct __go_map_descriptor *__descriptor;
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/* The number of elements in the hash table. */
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uintptr_t __element_count;
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/* The number of entries in the __buckets array. */
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uintptr_t __bucket_count;
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/* Each bucket is a pointer to a linked list of map entries. */
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void **__buckets;
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};
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/* For a map iteration the compiled code will use a pointer to an
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iteration structure. The iteration structure will be allocated on
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the stack. The Go code must allocate at least enough space. */
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struct __go_hash_iter
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{
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/* A pointer to the current entry. This will be set to NULL when
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the range has completed. The Go will test this field, so it must
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be the first one in the structure. */
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const void *entry;
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/* The map we are iterating over. */
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const struct __go_map *map;
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/* A pointer to the next entry in the current bucket. This permits
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deleting the current entry. This will be NULL when we have seen
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all the entries in the current bucket. */
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const void *next_entry;
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/* The bucket index of the current and next entry. */
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uintptr_t bucket;
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};
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extern struct __go_map *__go_new_map (const struct __go_map_descriptor *,
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uintptr_t);
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extern uintptr_t __go_map_next_prime (uintptr_t);
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extern void *__go_map_index (struct __go_map *, const void *, _Bool);
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extern void __go_map_delete (struct __go_map *, const void *);
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extern void __go_mapiterinit (const struct __go_map *, struct __go_hash_iter *);
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extern void __go_mapiternext (struct __go_hash_iter *);
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extern void __go_mapiter1 (struct __go_hash_iter *it, unsigned char *key);
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extern void __go_mapiter2 (struct __go_hash_iter *it, unsigned char *key,
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unsigned char *val);
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