264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* $Id$
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*
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Copyright (c) 2014-2016 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "hcl-prv.h"
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static hcl_oop_oop_t expand_bucket (hcl_t* hcl, hcl_oop_oop_t oldbuc)
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{
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hcl_oop_oop_t newbuc;
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hcl_oow_t oldsz, newsz, index;
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hcl_oop_cons_t ass;
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hcl_oop_char_t key;
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oldsz = HCL_OBJ_GET_SIZE(oldbuc);
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/* TODO: better growth policy? */
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if (oldsz < 5000) newsz = oldsz + oldsz;
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else if (oldsz < 50000) newsz = oldsz + (oldsz / 2);
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else if (oldsz < 100000) newsz = oldsz + (oldsz / 4);
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else if (oldsz < 200000) newsz = oldsz + (oldsz / 8);
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else if (oldsz < 400000) newsz = oldsz + (oldsz / 16);
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else if (oldsz < 800000) newsz = oldsz + (oldsz / 32);
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else if (oldsz < 1600000) newsz = oldsz + (oldsz / 64);
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else
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{
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hcl_oow_t inc, inc_max;
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inc = oldsz / 128;
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inc_max = HCL_OBJ_SIZE_MAX - oldsz;
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if (inc > inc_max)
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{
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if (inc_max > 0) inc = inc_max;
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else
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{
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hcl->errnum = HCL_EOOMEM;
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return HCL_NULL;
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}
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}
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newsz = oldsz + inc;
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}
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hcl_pushtmp (hcl, (hcl_oop_t*)&oldbuc);
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newbuc = (hcl_oop_oop_t)hcl_makearray (hcl, newsz);
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hcl_poptmp (hcl);
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if (!newbuc) return HCL_NULL;
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while (oldsz > 0)
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{
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ass = (hcl_oop_cons_t)oldbuc->slot[--oldsz];
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if ((hcl_oop_t)ass != hcl->_nil)
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{
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HCL_ASSERT (HCL_BRANDOF(hcl,ass) == HCL_BRAND_CONS);
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key = (hcl_oop_char_t)ass->car;
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HCL_ASSERT (HCL_BRANDOF(hcl,key) == HCL_BRAND_SYMBOL);
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index = hcl_hashchars(key->slot, HCL_OBJ_GET_SIZE(key)) % newsz;
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while (newbuc->slot[index] != hcl->_nil) index = (index + 1) % newsz;
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newbuc->slot[index] = (hcl_oop_t)ass;
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}
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}
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return newbuc;
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}
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static hcl_oop_cons_t find_or_upsert (hcl_t* hcl, hcl_oop_set_t dic, hcl_oop_char_t key, hcl_oop_t value)
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{
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hcl_ooi_t tally;
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hcl_oow_t index;
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hcl_oop_cons_t ass;
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hcl_oow_t tmp_count = 0;
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/* the system dictionary is not a generic dictionary.
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* it accepts only a symbol as a key. */
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HCL_ASSERT (HCL_IS_SYMBOL(hcl,key));
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HCL_ASSERT (HCL_OOP_IS_SMOOI(dic->tally));
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HCL_ASSERT (HCL_IS_ARRAY(hcl,dic->bucket));
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index = hcl_hashchars(key->slot, HCL_OBJ_GET_SIZE(key)) % HCL_OBJ_GET_SIZE(dic->bucket);
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/* find */
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while (dic->bucket->slot[index] != hcl->_nil)
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{
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ass = (hcl_oop_cons_t)dic->bucket->slot[index];
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HCL_ASSERT (HCL_BRANDOF(hcl,ass) == HCL_BRAND_CONS);
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HCL_ASSERT (HCL_BRANDOF(hcl,ass->car) == HCL_BRAND_SYMBOL);
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if (HCL_OBJ_GET_SIZE(key) == HCL_OBJ_GET_SIZE(ass->car) &&
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hcl_equalchars (key->slot, ((hcl_oop_char_t)ass->car)->slot, HCL_OBJ_GET_SIZE(key)))
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{
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/* the value of HCL_NULL indicates no insertion or update. */
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if (value) ass->cdr = value; /* update */
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return ass;
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}
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index = (index + 1) % HCL_OBJ_GET_SIZE(dic->bucket);
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}
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if (!value)
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{
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/* when value is HCL_NULL, perform no insertion.
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* the value of HCL_NULL indicates no insertion or update. */
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hcl->errnum = HCL_ENOENT;
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return HCL_NULL;
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}
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/* the key is not found. insert it. */
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HCL_ASSERT (HCL_OOP_IS_SMOOI(dic->tally));
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tally = HCL_OOP_TO_SMOOI(dic->tally);
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if (tally >= HCL_SMOOI_MAX)
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{
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/* this built-in dictionary is not allowed to hold more than
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* HCL_SMOOI_MAX items for efficiency sake */
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hcl->errnum = HCL_EDFULL;
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return HCL_NULL;
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}
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hcl_pushtmp (hcl, (hcl_oop_t*)&dic); tmp_count++;
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hcl_pushtmp (hcl, (hcl_oop_t*)&key); tmp_count++;
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hcl_pushtmp (hcl, &value); tmp_count++;
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/* no conversion to hcl_oow_t is necessary for tally + 1.
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* the maximum value of tally is checked to be HCL_SMOOI_MAX - 1.
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* tally + 1 can produce at most HCL_SMOOI_MAX. above all,
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* HCL_SMOOI_MAX is way smaller than HCL_TYPE_MAX(hcl_ooi_t). */
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if (tally + 1 >= HCL_OBJ_GET_SIZE(dic->bucket))
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{
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hcl_oop_oop_t bucket;
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/* TODO: make the growth policy configurable instead of growing
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it just before it gets full. The polcy can be grow it
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if it's 70% full */
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/* enlarge the bucket before it gets full to
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* make sure that it has at least one free slot left
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* after having added a new symbol. this is to help
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* traversal end at a _nil slot if no entry is found. */
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bucket = expand_bucket (hcl, dic->bucket);
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if (!bucket) goto oops;
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dic->bucket = bucket;
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/* recalculate the index for the expanded bucket */
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index = hcl_hashchars(key->slot, HCL_OBJ_GET_SIZE(key)) % HCL_OBJ_GET_SIZE(dic->bucket);
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while (dic->bucket->slot[index] != hcl->_nil)
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index = (index + 1) % HCL_OBJ_GET_SIZE(dic->bucket);
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}
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/* create a new assocation of a key and a value since
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* the key isn't found in the root dictionary */
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ass = (hcl_oop_cons_t)hcl_makecons (hcl, (hcl_oop_t)key, (hcl_oop_t)value);
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if (!ass) goto oops;
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/* the current tally must be less than the maximum value. otherwise,
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* it overflows after increment below */
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HCL_ASSERT (tally < HCL_SMOOI_MAX);
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dic->tally = HCL_SMOOI_TO_OOP(tally + 1);
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dic->bucket->slot[index] = (hcl_oop_t)ass;
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hcl_poptmps (hcl, tmp_count);
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return ass;
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oops:
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hcl_poptmps (hcl, tmp_count);
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return HCL_NULL;
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}
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static hcl_oop_cons_t lookup (hcl_t* hcl, hcl_oop_set_t dic, const hcl_oocs_t* name)
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{
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/* this is special version of hcl_getatsysdic() that performs
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* lookup using a plain string specified */
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hcl_oow_t index;
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hcl_oop_cons_t ass;
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HCL_ASSERT (HCL_OOP_IS_SMOOI(dic->tally));
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HCL_ASSERT (HCL_BRANDOF(hcl,dic->bucket) == HCL_BRAND_ARRAY);
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index = hcl_hashchars(name->ptr, name->len) % HCL_OBJ_GET_SIZE(dic->bucket);
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while (dic->bucket->slot[index] != hcl->_nil)
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{
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ass = (hcl_oop_cons_t)dic->bucket->slot[index];
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HCL_ASSERT (HCL_BRANDOF(hcl,ass) == HCL_BRAND_CONS);
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HCL_ASSERT (HCL_BRANDOF(hcl,ass->car) == HCL_BRAND_SYMBOL);
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if (name->len == HCL_OBJ_GET_SIZE(ass->car) &&
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hcl_equalchars(name->ptr, ((hcl_oop_char_t)ass->car)->slot, name->len))
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{
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return ass;
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}
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index = (index + 1) % HCL_OBJ_GET_SIZE(dic->bucket);
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}
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/* when value is HCL_NULL, perform no insertion */
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hcl->errnum = HCL_ENOENT;
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return HCL_NULL;
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}
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hcl_oop_cons_t hcl_putatsysdic (hcl_t* hcl, hcl_oop_t key, hcl_oop_t value)
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{
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HCL_ASSERT (HCL_IS_SYMBOL(hcl,key));
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return find_or_upsert (hcl, hcl->sysdic, (hcl_oop_char_t)key, value);
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}
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hcl_oop_cons_t hcl_getatsysdic (hcl_t* hcl, hcl_oop_t key)
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{
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HCL_ASSERT (HCL_IS_SYMBOL(hcl,key));
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return find_or_upsert (hcl, hcl->sysdic, (hcl_oop_char_t)key, HCL_NULL);
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}
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hcl_oop_cons_t hcl_lookupsysdic (hcl_t* hcl, const hcl_oocs_t* name)
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{
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return lookup (hcl, hcl->sysdic, name);
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}
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hcl_oop_cons_t hcl_putatdic (hcl_t* hcl, hcl_oop_set_t dic, hcl_oop_t key, hcl_oop_t value)
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{
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HCL_ASSERT (HCL_BRANDOF(hcl,key) == HCL_BRAND_SYMBOL);
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return find_or_upsert (hcl, dic, (hcl_oop_char_t)key, value);
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}
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hcl_oop_cons_t hcl_getatdic (hcl_t* hcl, hcl_oop_set_t dic, hcl_oop_t key)
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{
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HCL_ASSERT (HCL_BRANDOF(hcl,key) == HCL_BRAND_SYMBOL);
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return find_or_upsert (hcl, dic, (hcl_oop_char_t)key, HCL_NULL);
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}
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hcl_oop_cons_t hcl_lookupdic (hcl_t* hcl, hcl_oop_set_t dic, const hcl_oocs_t* name)
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{
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return lookup (hcl, dic, name);
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}
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hcl_oop_set_t hcl_makedic (hcl_t* hcl, hcl_oow_t size)
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{
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return (hcl_oop_set_t)hcl_makeset (hcl, size);
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}
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