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850 lines
21 KiB
C
850 lines
21 KiB
C
/* Interface to hashtable implementations.
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Copyright (C) 2006-2021 Free Software Foundation, Inc.
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This file is part of libctf.
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libctf is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not see
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<http://www.gnu.org/licenses/>. */
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#include <ctf-impl.h>
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#include <string.h>
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#include "libiberty.h"
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#include "hashtab.h"
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/* We have three hashtable implementations:
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- ctf_hash_* is an interface to a fixed-size hash from const char * ->
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ctf_id_t with number of elements specified at creation time, that should
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support addition of items but need not support removal.
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- ctf_dynhash_* is an interface to a dynamically-expanding hash with
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unknown size that should support addition of large numbers of items, and
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removal as well, and is used only at type-insertion time and during
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linking.
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- ctf_dynset_* is an interface to a dynamically-expanding hash that contains
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only keys: no values.
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These can be implemented by the same underlying hashmap if you wish. */
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/* The helem is used for general key/value mappings in both the ctf_hash and
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ctf_dynhash: the owner may not have space allocated for it, and will be
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garbage (not NULL!) in that case. */
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typedef struct ctf_helem
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{
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void *key; /* Either a pointer, or a coerced ctf_id_t. */
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void *value; /* The value (possibly a coerced int). */
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ctf_dynhash_t *owner; /* The hash that owns us. */
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} ctf_helem_t;
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/* Equally, the key_free and value_free may not exist. */
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struct ctf_dynhash
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{
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struct htab *htab;
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ctf_hash_free_fun key_free;
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ctf_hash_free_fun value_free;
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};
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/* Hash and eq functions for the dynhash and hash. */
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unsigned int
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ctf_hash_integer (const void *ptr)
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{
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ctf_helem_t *hep = (ctf_helem_t *) ptr;
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return htab_hash_pointer (hep->key);
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}
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int
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ctf_hash_eq_integer (const void *a, const void *b)
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{
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ctf_helem_t *hep_a = (ctf_helem_t *) a;
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ctf_helem_t *hep_b = (ctf_helem_t *) b;
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return htab_eq_pointer (hep_a->key, hep_b->key);
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}
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unsigned int
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ctf_hash_string (const void *ptr)
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{
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ctf_helem_t *hep = (ctf_helem_t *) ptr;
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return htab_hash_string (hep->key);
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}
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int
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ctf_hash_eq_string (const void *a, const void *b)
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{
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ctf_helem_t *hep_a = (ctf_helem_t *) a;
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ctf_helem_t *hep_b = (ctf_helem_t *) b;
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return !strcmp((const char *) hep_a->key, (const char *) hep_b->key);
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}
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/* Hash a type_key. */
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unsigned int
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ctf_hash_type_key (const void *ptr)
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{
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ctf_helem_t *hep = (ctf_helem_t *) ptr;
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ctf_link_type_key_t *k = (ctf_link_type_key_t *) hep->key;
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return htab_hash_pointer (k->cltk_fp) + 59
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* htab_hash_pointer ((void *) (uintptr_t) k->cltk_idx);
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}
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int
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ctf_hash_eq_type_key (const void *a, const void *b)
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{
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ctf_helem_t *hep_a = (ctf_helem_t *) a;
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ctf_helem_t *hep_b = (ctf_helem_t *) b;
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ctf_link_type_key_t *key_a = (ctf_link_type_key_t *) hep_a->key;
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ctf_link_type_key_t *key_b = (ctf_link_type_key_t *) hep_b->key;
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return (key_a->cltk_fp == key_b->cltk_fp)
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&& (key_a->cltk_idx == key_b->cltk_idx);
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}
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/* Hash a type_id_key. */
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unsigned int
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ctf_hash_type_id_key (const void *ptr)
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{
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ctf_helem_t *hep = (ctf_helem_t *) ptr;
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ctf_type_id_key_t *k = (ctf_type_id_key_t *) hep->key;
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return htab_hash_pointer ((void *) (uintptr_t) k->ctii_input_num)
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+ 59 * htab_hash_pointer ((void *) (uintptr_t) k->ctii_type);
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}
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int
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ctf_hash_eq_type_id_key (const void *a, const void *b)
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{
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ctf_helem_t *hep_a = (ctf_helem_t *) a;
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ctf_helem_t *hep_b = (ctf_helem_t *) b;
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ctf_type_id_key_t *key_a = (ctf_type_id_key_t *) hep_a->key;
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ctf_type_id_key_t *key_b = (ctf_type_id_key_t *) hep_b->key;
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return (key_a->ctii_input_num == key_b->ctii_input_num)
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&& (key_a->ctii_type == key_b->ctii_type);
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}
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/* Hash and eq functions for the dynset. Most of these can just use the
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underlying hashtab functions directly. */
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int
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ctf_dynset_eq_string (const void *a, const void *b)
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{
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return !strcmp((const char *) a, (const char *) b);
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}
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/* The dynhash, used for hashes whose size is not known at creation time. */
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/* Free a single ctf_helem with arbitrary key/value functions. */
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static void
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ctf_dynhash_item_free (void *item)
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{
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ctf_helem_t *helem = item;
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if (helem->owner->key_free && helem->key)
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helem->owner->key_free (helem->key);
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if (helem->owner->value_free && helem->value)
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helem->owner->value_free (helem->value);
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free (helem);
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}
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ctf_dynhash_t *
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ctf_dynhash_create (ctf_hash_fun hash_fun, ctf_hash_eq_fun eq_fun,
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ctf_hash_free_fun key_free, ctf_hash_free_fun value_free)
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{
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ctf_dynhash_t *dynhash;
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htab_del del = ctf_dynhash_item_free;
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if (key_free || value_free)
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dynhash = malloc (sizeof (ctf_dynhash_t));
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else
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dynhash = malloc (offsetof (ctf_dynhash_t, key_free));
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if (!dynhash)
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return NULL;
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if (key_free == NULL && value_free == NULL)
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del = free;
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/* 7 is arbitrary and untested for now. */
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if ((dynhash->htab = htab_create_alloc (7, (htab_hash) hash_fun, eq_fun,
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del, xcalloc, free)) == NULL)
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{
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free (dynhash);
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return NULL;
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}
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if (key_free || value_free)
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{
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dynhash->key_free = key_free;
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dynhash->value_free = value_free;
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}
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return dynhash;
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}
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static ctf_helem_t **
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ctf_hashtab_lookup (struct htab *htab, const void *key, enum insert_option insert)
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{
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ctf_helem_t tmp = { .key = (void *) key };
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return (ctf_helem_t **) htab_find_slot (htab, &tmp, insert);
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}
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static ctf_helem_t *
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ctf_hashtab_insert (struct htab *htab, void *key, void *value,
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ctf_hash_free_fun key_free,
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ctf_hash_free_fun value_free)
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{
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ctf_helem_t **slot;
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slot = ctf_hashtab_lookup (htab, key, INSERT);
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if (!slot)
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{
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errno = ENOMEM;
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return NULL;
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}
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if (!*slot)
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{
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/* Only spend space on the owner if we're going to use it: if there is a
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key or value freeing function. */
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if (key_free || value_free)
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*slot = malloc (sizeof (ctf_helem_t));
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else
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*slot = malloc (offsetof (ctf_helem_t, owner));
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if (!*slot)
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return NULL;
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(*slot)->key = key;
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}
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else
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{
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if (key_free)
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key_free (key);
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if (value_free)
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value_free ((*slot)->value);
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}
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(*slot)->value = value;
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return *slot;
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}
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int
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ctf_dynhash_insert (ctf_dynhash_t *hp, void *key, void *value)
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{
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ctf_helem_t *slot;
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ctf_hash_free_fun key_free = NULL, value_free = NULL;
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if (hp->htab->del_f == ctf_dynhash_item_free)
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{
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key_free = hp->key_free;
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value_free = hp->value_free;
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}
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slot = ctf_hashtab_insert (hp->htab, key, value,
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key_free, value_free);
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if (!slot)
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return errno;
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/* Keep track of the owner, so that the del function can get at the key_free
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and value_free functions. Only do this if one of those functions is set:
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if not, the owner is not even present in the helem. */
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if (key_free || value_free)
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slot->owner = hp;
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return 0;
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}
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void
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ctf_dynhash_remove (ctf_dynhash_t *hp, const void *key)
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{
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ctf_helem_t hep = { (void *) key, NULL, NULL };
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htab_remove_elt (hp->htab, &hep);
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}
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void
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ctf_dynhash_empty (ctf_dynhash_t *hp)
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{
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htab_empty (hp->htab);
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}
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size_t
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ctf_dynhash_elements (ctf_dynhash_t *hp)
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{
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return htab_elements (hp->htab);
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}
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void *
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ctf_dynhash_lookup (ctf_dynhash_t *hp, const void *key)
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{
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ctf_helem_t **slot;
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slot = ctf_hashtab_lookup (hp->htab, key, NO_INSERT);
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if (slot)
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return (*slot)->value;
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return NULL;
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}
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/* TRUE/FALSE return. */
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int
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ctf_dynhash_lookup_kv (ctf_dynhash_t *hp, const void *key,
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const void **orig_key, void **value)
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{
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ctf_helem_t **slot;
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slot = ctf_hashtab_lookup (hp->htab, key, NO_INSERT);
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if (slot)
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{
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if (orig_key)
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*orig_key = (*slot)->key;
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if (value)
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*value = (*slot)->value;
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return 1;
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}
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return 0;
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}
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typedef struct ctf_traverse_cb_arg
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{
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ctf_hash_iter_f fun;
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void *arg;
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} ctf_traverse_cb_arg_t;
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static int
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ctf_hashtab_traverse (void **slot, void *arg_)
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{
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ctf_helem_t *helem = *((ctf_helem_t **) slot);
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ctf_traverse_cb_arg_t *arg = (ctf_traverse_cb_arg_t *) arg_;
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arg->fun (helem->key, helem->value, arg->arg);
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return 1;
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}
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void
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ctf_dynhash_iter (ctf_dynhash_t *hp, ctf_hash_iter_f fun, void *arg_)
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{
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ctf_traverse_cb_arg_t arg = { fun, arg_ };
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htab_traverse (hp->htab, ctf_hashtab_traverse, &arg);
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}
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typedef struct ctf_traverse_find_cb_arg
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{
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ctf_hash_iter_find_f fun;
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void *arg;
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void *found_key;
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} ctf_traverse_find_cb_arg_t;
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static int
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ctf_hashtab_traverse_find (void **slot, void *arg_)
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{
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ctf_helem_t *helem = *((ctf_helem_t **) slot);
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ctf_traverse_find_cb_arg_t *arg = (ctf_traverse_find_cb_arg_t *) arg_;
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if (arg->fun (helem->key, helem->value, arg->arg))
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{
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arg->found_key = helem->key;
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return 0;
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}
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return 1;
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}
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void *
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ctf_dynhash_iter_find (ctf_dynhash_t *hp, ctf_hash_iter_find_f fun, void *arg_)
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{
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ctf_traverse_find_cb_arg_t arg = { fun, arg_, NULL };
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htab_traverse (hp->htab, ctf_hashtab_traverse_find, &arg);
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return arg.found_key;
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}
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typedef struct ctf_traverse_remove_cb_arg
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{
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struct htab *htab;
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ctf_hash_iter_remove_f fun;
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void *arg;
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} ctf_traverse_remove_cb_arg_t;
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static int
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ctf_hashtab_traverse_remove (void **slot, void *arg_)
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{
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ctf_helem_t *helem = *((ctf_helem_t **) slot);
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ctf_traverse_remove_cb_arg_t *arg = (ctf_traverse_remove_cb_arg_t *) arg_;
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if (arg->fun (helem->key, helem->value, arg->arg))
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htab_clear_slot (arg->htab, slot);
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return 1;
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}
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void
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ctf_dynhash_iter_remove (ctf_dynhash_t *hp, ctf_hash_iter_remove_f fun,
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void *arg_)
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{
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ctf_traverse_remove_cb_arg_t arg = { hp->htab, fun, arg_ };
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htab_traverse (hp->htab, ctf_hashtab_traverse_remove, &arg);
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}
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/* Traverse a dynhash in arbitrary order, in _next iterator form.
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Mutating the dynhash while iterating is not supported (just as it isn't for
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htab_traverse).
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Note: unusually, this returns zero on success and a *positive* value on
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error, because it does not take an fp, taking an error pointer would be
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incredibly clunky, and nearly all error-handling ends up stuffing the result
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of this into some sort of errno or ctf_errno, which is invariably
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positive. So doing this simplifies essentially all callers. */
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int
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ctf_dynhash_next (ctf_dynhash_t *h, ctf_next_t **it, void **key, void **value)
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{
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ctf_next_t *i = *it;
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ctf_helem_t *slot;
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if (!i)
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{
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size_t size = htab_size (h->htab);
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/* If the table has too many entries to fit in an ssize_t, just give up.
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This might be spurious, but if any type-related hashtable has ever been
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nearly as large as that then something very odd is going on. */
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if (((ssize_t) size) < 0)
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return EDOM;
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if ((i = ctf_next_create ()) == NULL)
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return ENOMEM;
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i->u.ctn_hash_slot = h->htab->entries;
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i->cu.ctn_h = h;
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i->ctn_n = 0;
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i->ctn_size = (ssize_t) size;
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i->ctn_iter_fun = (void (*) (void)) ctf_dynhash_next;
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*it = i;
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}
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if ((void (*) (void)) ctf_dynhash_next != i->ctn_iter_fun)
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return ECTF_NEXT_WRONGFUN;
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if (h != i->cu.ctn_h)
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return ECTF_NEXT_WRONGFP;
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if ((ssize_t) i->ctn_n == i->ctn_size)
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goto hash_end;
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while ((ssize_t) i->ctn_n < i->ctn_size
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&& (*i->u.ctn_hash_slot == HTAB_EMPTY_ENTRY
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|| *i->u.ctn_hash_slot == HTAB_DELETED_ENTRY))
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{
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i->u.ctn_hash_slot++;
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i->ctn_n++;
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}
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if ((ssize_t) i->ctn_n == i->ctn_size)
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goto hash_end;
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slot = *i->u.ctn_hash_slot;
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if (key)
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*key = slot->key;
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if (value)
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*value = slot->value;
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i->u.ctn_hash_slot++;
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i->ctn_n++;
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return 0;
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hash_end:
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ctf_next_destroy (i);
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*it = NULL;
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return ECTF_NEXT_END;
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}
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int
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ctf_dynhash_sort_by_name (const ctf_next_hkv_t *one, const ctf_next_hkv_t *two,
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void *unused _libctf_unused_)
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{
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return strcmp ((char *) one->hkv_key, (char *) two->hkv_key);
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}
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/* Traverse a sorted dynhash, in _next iterator form.
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See ctf_dynhash_next for notes on error returns, etc.
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Sort keys before iterating over them using the SORT_FUN and SORT_ARG.
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If SORT_FUN is null, thunks to ctf_dynhash_next. */
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int
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ctf_dynhash_next_sorted (ctf_dynhash_t *h, ctf_next_t **it, void **key,
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void **value, ctf_hash_sort_f sort_fun, void *sort_arg)
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{
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ctf_next_t *i = *it;
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if (sort_fun == NULL)
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|
return ctf_dynhash_next (h, it, key, value);
|
|
|
|
if (!i)
|
|
{
|
|
size_t els = ctf_dynhash_elements (h);
|
|
ctf_next_t *accum_i = NULL;
|
|
void *key, *value;
|
|
int err;
|
|
ctf_next_hkv_t *walk;
|
|
|
|
if (((ssize_t) els) < 0)
|
|
return EDOM;
|
|
|
|
if ((i = ctf_next_create ()) == NULL)
|
|
return ENOMEM;
|
|
|
|
if ((i->u.ctn_sorted_hkv = calloc (els, sizeof (ctf_next_hkv_t))) == NULL)
|
|
{
|
|
ctf_next_destroy (i);
|
|
return ENOMEM;
|
|
}
|
|
walk = i->u.ctn_sorted_hkv;
|
|
|
|
i->cu.ctn_h = h;
|
|
|
|
while ((err = ctf_dynhash_next (h, &accum_i, &key, &value)) == 0)
|
|
{
|
|
walk->hkv_key = key;
|
|
walk->hkv_value = value;
|
|
walk++;
|
|
}
|
|
if (err != ECTF_NEXT_END)
|
|
{
|
|
ctf_next_destroy (i);
|
|
return err;
|
|
}
|
|
|
|
if (sort_fun)
|
|
ctf_qsort_r (i->u.ctn_sorted_hkv, els, sizeof (ctf_next_hkv_t),
|
|
(int (*) (const void *, const void *, void *)) sort_fun,
|
|
sort_arg);
|
|
i->ctn_n = 0;
|
|
i->ctn_size = (ssize_t) els;
|
|
i->ctn_iter_fun = (void (*) (void)) ctf_dynhash_next_sorted;
|
|
*it = i;
|
|
}
|
|
|
|
if ((void (*) (void)) ctf_dynhash_next_sorted != i->ctn_iter_fun)
|
|
return ECTF_NEXT_WRONGFUN;
|
|
|
|
if (h != i->cu.ctn_h)
|
|
return ECTF_NEXT_WRONGFP;
|
|
|
|
if ((ssize_t) i->ctn_n == i->ctn_size)
|
|
{
|
|
ctf_next_destroy (i);
|
|
*it = NULL;
|
|
return ECTF_NEXT_END;
|
|
}
|
|
|
|
if (key)
|
|
*key = i->u.ctn_sorted_hkv[i->ctn_n].hkv_key;
|
|
if (value)
|
|
*value = i->u.ctn_sorted_hkv[i->ctn_n].hkv_value;
|
|
i->ctn_n++;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ctf_dynhash_destroy (ctf_dynhash_t *hp)
|
|
{
|
|
if (hp != NULL)
|
|
htab_delete (hp->htab);
|
|
free (hp);
|
|
}
|
|
|
|
/* The dynset, used for sets of keys with no value. The implementation of this
|
|
can be much simpler, because without a value the slot can simply be the
|
|
stored key, which means we don't need to store the freeing functions and the
|
|
dynset itself is just a htab. */
|
|
|
|
ctf_dynset_t *
|
|
ctf_dynset_create (htab_hash hash_fun, htab_eq eq_fun,
|
|
ctf_hash_free_fun key_free)
|
|
{
|
|
/* 7 is arbitrary and untested for now. */
|
|
return (ctf_dynset_t *) htab_create_alloc (7, (htab_hash) hash_fun, eq_fun,
|
|
key_free, xcalloc, free);
|
|
}
|
|
|
|
/* The dynset has one complexity: the underlying implementation reserves two
|
|
values for internal hash table implementation details (empty versus deleted
|
|
entries). These values are otherwise very useful for pointers cast to ints,
|
|
so transform the ctf_dynset_inserted value to allow for it. (This
|
|
introduces an ambiguity in that one can no longer store these two values in
|
|
the dynset, but if we pick high enough values this is very unlikely to be a
|
|
problem.)
|
|
|
|
We leak this implementation detail to the freeing functions on the grounds
|
|
that any use of these functions is overwhelmingly likely to be in sets using
|
|
real pointers, which will be unaffected. */
|
|
|
|
#define DYNSET_EMPTY_ENTRY_REPLACEMENT ((void *) (uintptr_t) -64)
|
|
#define DYNSET_DELETED_ENTRY_REPLACEMENT ((void *) (uintptr_t) -63)
|
|
|
|
static void *
|
|
key_to_internal (const void *key)
|
|
{
|
|
if (key == HTAB_EMPTY_ENTRY)
|
|
return DYNSET_EMPTY_ENTRY_REPLACEMENT;
|
|
else if (key == HTAB_DELETED_ENTRY)
|
|
return DYNSET_DELETED_ENTRY_REPLACEMENT;
|
|
|
|
return (void *) key;
|
|
}
|
|
|
|
static void *
|
|
internal_to_key (const void *internal)
|
|
{
|
|
if (internal == DYNSET_EMPTY_ENTRY_REPLACEMENT)
|
|
return HTAB_EMPTY_ENTRY;
|
|
else if (internal == DYNSET_DELETED_ENTRY_REPLACEMENT)
|
|
return HTAB_DELETED_ENTRY;
|
|
return (void *) internal;
|
|
}
|
|
|
|
int
|
|
ctf_dynset_insert (ctf_dynset_t *hp, void *key)
|
|
{
|
|
struct htab *htab = (struct htab *) hp;
|
|
void **slot;
|
|
|
|
slot = htab_find_slot (htab, key, INSERT);
|
|
|
|
if (!slot)
|
|
{
|
|
errno = ENOMEM;
|
|
return -errno;
|
|
}
|
|
|
|
if (*slot)
|
|
{
|
|
if (htab->del_f)
|
|
(*htab->del_f) (*slot);
|
|
}
|
|
|
|
*slot = key_to_internal (key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ctf_dynset_remove (ctf_dynset_t *hp, const void *key)
|
|
{
|
|
htab_remove_elt ((struct htab *) hp, key_to_internal (key));
|
|
}
|
|
|
|
void
|
|
ctf_dynset_destroy (ctf_dynset_t *hp)
|
|
{
|
|
if (hp != NULL)
|
|
htab_delete ((struct htab *) hp);
|
|
}
|
|
|
|
void *
|
|
ctf_dynset_lookup (ctf_dynset_t *hp, const void *key)
|
|
{
|
|
void **slot = htab_find_slot ((struct htab *) hp,
|
|
key_to_internal (key), NO_INSERT);
|
|
|
|
if (slot)
|
|
return internal_to_key (*slot);
|
|
return NULL;
|
|
}
|
|
|
|
/* TRUE/FALSE return. */
|
|
int
|
|
ctf_dynset_exists (ctf_dynset_t *hp, const void *key, const void **orig_key)
|
|
{
|
|
void **slot = htab_find_slot ((struct htab *) hp,
|
|
key_to_internal (key), NO_INSERT);
|
|
|
|
if (orig_key && slot)
|
|
*orig_key = internal_to_key (*slot);
|
|
return (slot != NULL);
|
|
}
|
|
|
|
/* Look up a completely random value from the set, if any exist.
|
|
Keys with value zero cannot be distinguished from a nonexistent key. */
|
|
void *
|
|
ctf_dynset_lookup_any (ctf_dynset_t *hp)
|
|
{
|
|
struct htab *htab = (struct htab *) hp;
|
|
void **slot = htab->entries;
|
|
void **limit = slot + htab_size (htab);
|
|
|
|
while (slot < limit
|
|
&& (*slot == HTAB_EMPTY_ENTRY || *slot == HTAB_DELETED_ENTRY))
|
|
slot++;
|
|
|
|
if (slot < limit)
|
|
return internal_to_key (*slot);
|
|
return NULL;
|
|
}
|
|
|
|
/* Traverse a dynset in arbitrary order, in _next iterator form.
|
|
|
|
Otherwise, just like ctf_dynhash_next. */
|
|
int
|
|
ctf_dynset_next (ctf_dynset_t *hp, ctf_next_t **it, void **key)
|
|
{
|
|
struct htab *htab = (struct htab *) hp;
|
|
ctf_next_t *i = *it;
|
|
void *slot;
|
|
|
|
if (!i)
|
|
{
|
|
size_t size = htab_size (htab);
|
|
|
|
/* If the table has too many entries to fit in an ssize_t, just give up.
|
|
This might be spurious, but if any type-related hashtable has ever been
|
|
nearly as large as that then somthing very odd is going on. */
|
|
|
|
if (((ssize_t) size) < 0)
|
|
return EDOM;
|
|
|
|
if ((i = ctf_next_create ()) == NULL)
|
|
return ENOMEM;
|
|
|
|
i->u.ctn_hash_slot = htab->entries;
|
|
i->cu.ctn_s = hp;
|
|
i->ctn_n = 0;
|
|
i->ctn_size = (ssize_t) size;
|
|
i->ctn_iter_fun = (void (*) (void)) ctf_dynset_next;
|
|
*it = i;
|
|
}
|
|
|
|
if ((void (*) (void)) ctf_dynset_next != i->ctn_iter_fun)
|
|
return ECTF_NEXT_WRONGFUN;
|
|
|
|
if (hp != i->cu.ctn_s)
|
|
return ECTF_NEXT_WRONGFP;
|
|
|
|
if ((ssize_t) i->ctn_n == i->ctn_size)
|
|
goto set_end;
|
|
|
|
while ((ssize_t) i->ctn_n < i->ctn_size
|
|
&& (*i->u.ctn_hash_slot == HTAB_EMPTY_ENTRY
|
|
|| *i->u.ctn_hash_slot == HTAB_DELETED_ENTRY))
|
|
{
|
|
i->u.ctn_hash_slot++;
|
|
i->ctn_n++;
|
|
}
|
|
|
|
if ((ssize_t) i->ctn_n == i->ctn_size)
|
|
goto set_end;
|
|
|
|
slot = *i->u.ctn_hash_slot;
|
|
|
|
if (key)
|
|
*key = internal_to_key (slot);
|
|
|
|
i->u.ctn_hash_slot++;
|
|
i->ctn_n++;
|
|
|
|
return 0;
|
|
|
|
set_end:
|
|
ctf_next_destroy (i);
|
|
*it = NULL;
|
|
return ECTF_NEXT_END;
|
|
}
|
|
|
|
/* ctf_hash, used for fixed-size maps from const char * -> ctf_id_t without
|
|
removal. This is a straight cast of a hashtab. */
|
|
|
|
ctf_hash_t *
|
|
ctf_hash_create (unsigned long nelems, ctf_hash_fun hash_fun,
|
|
ctf_hash_eq_fun eq_fun)
|
|
{
|
|
return (ctf_hash_t *) htab_create_alloc (nelems, (htab_hash) hash_fun,
|
|
eq_fun, free, xcalloc, free);
|
|
}
|
|
|
|
uint32_t
|
|
ctf_hash_size (const ctf_hash_t *hp)
|
|
{
|
|
return htab_elements ((struct htab *) hp);
|
|
}
|
|
|
|
int
|
|
ctf_hash_insert_type (ctf_hash_t *hp, ctf_dict_t *fp, uint32_t type,
|
|
uint32_t name)
|
|
{
|
|
const char *str = ctf_strraw (fp, name);
|
|
|
|
if (type == 0)
|
|
return EINVAL;
|
|
|
|
if (str == NULL
|
|
&& CTF_NAME_STID (name) == CTF_STRTAB_1
|
|
&& fp->ctf_syn_ext_strtab == NULL
|
|
&& fp->ctf_str[CTF_NAME_STID (name)].cts_strs == NULL)
|
|
return ECTF_STRTAB;
|
|
|
|
if (str == NULL)
|
|
return ECTF_BADNAME;
|
|
|
|
if (str[0] == '\0')
|
|
return 0; /* Just ignore empty strings on behalf of caller. */
|
|
|
|
if (ctf_hashtab_insert ((struct htab *) hp, (char *) str,
|
|
(void *) (ptrdiff_t) type, NULL, NULL) != NULL)
|
|
return 0;
|
|
return errno;
|
|
}
|
|
|
|
/* if the key is already in the hash, override the previous definition with
|
|
this new official definition. If the key is not present, then call
|
|
ctf_hash_insert_type and hash it in. */
|
|
int
|
|
ctf_hash_define_type (ctf_hash_t *hp, ctf_dict_t *fp, uint32_t type,
|
|
uint32_t name)
|
|
{
|
|
/* This matches the semantics of ctf_hash_insert_type in this
|
|
implementation anyway. */
|
|
|
|
return ctf_hash_insert_type (hp, fp, type, name);
|
|
}
|
|
|
|
ctf_id_t
|
|
ctf_hash_lookup_type (ctf_hash_t *hp, ctf_dict_t *fp __attribute__ ((__unused__)),
|
|
const char *key)
|
|
{
|
|
ctf_helem_t **slot;
|
|
|
|
slot = ctf_hashtab_lookup ((struct htab *) hp, key, NO_INSERT);
|
|
|
|
if (slot)
|
|
return (ctf_id_t) (uintptr_t) ((*slot)->value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ctf_hash_destroy (ctf_hash_t *hp)
|
|
{
|
|
if (hp != NULL)
|
|
htab_delete ((struct htab *) hp);
|
|
}
|