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/* objc-map.cc -- Implementation of map data structures for ObjC compiler
Copyright (C) 2011-2022 Free Software Foundation, Inc.
Written by Nicola Pero <nicola.pero@meta-innovation.com>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser Public License for more details.
You should have received a copy of the GNU Lesser Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "objc-map.h"
#define OUT_OF_MEMORY { fprintf (stderr, "Out of memory\n"); abort (); }
static
size_t
ATTRIBUTE_PURE
next_power_of_two (size_t x)
{
size_t result = 1;
if (x < 2)
return 2;
/* Avoid the long calculation if x is already a power of two. Since
we internally always increase/shrink tables by powers of 2, the
calculation should only be done once, when the table is first
set up. */
if ((x & (x - 1)) == 0)
return x;
/* Calculate log_2 by counting how many times we can divide by 2
before reaching 0. */
while (x > 0)
{
x = x >> 1;
result = result << 1;
}
return result;
}
objc_map_t
objc_map_alloc_ggc (size_t initial_capacity)
{
objc_map_t map = ggc_cleared_alloc<objc_map_private> ();
if (map == NULL)
OUT_OF_MEMORY;
initial_capacity = next_power_of_two (initial_capacity);
map->number_of_slots = initial_capacity;
map->mask = initial_capacity - 1;
map->maximum_load_factor = 70;
map->max_number_of_non_empty_slots = (initial_capacity * map->maximum_load_factor) / 100;
map->slots = ggc_cleared_vec_alloc<tree> (initial_capacity);
map->values = ggc_cleared_vec_alloc<tree> (initial_capacity);
if (map->slots == NULL)
OUT_OF_MEMORY;
if (map->values == NULL)
OUT_OF_MEMORY;
return map;
}
void
objc_map_set_maximum_load_factor (objc_map_t map, int number_between_zero_and_one_hundred)
{
if (map->number_of_non_empty_slots != 0)
return;
map->maximum_load_factor = number_between_zero_and_one_hundred;
map->max_number_of_non_empty_slots = (map->number_of_slots * number_between_zero_and_one_hundred) / 100;
}
int
objc_map_maximum_load_factor (objc_map_t map)
{
return map->maximum_load_factor;
}
static void
objc_map_private_resize (objc_map_t map, size_t new_number_of_slots)
{
tree *old_slots = map->slots;
tree *old_values = map->values;
size_t i, old_number_of_slots = map->number_of_slots;
if (new_number_of_slots < (map->number_of_non_empty_slots))
new_number_of_slots = 2 * map->number_of_non_empty_slots;
new_number_of_slots = next_power_of_two (new_number_of_slots);
map->number_of_slots = new_number_of_slots;
map->mask = map->number_of_slots - 1;
map->max_number_of_non_empty_slots = (map->number_of_slots * map->maximum_load_factor) / 100;
map->slots = ggc_cleared_vec_alloc<tree> (map->number_of_slots);
map->values = ggc_cleared_vec_alloc<tree> (map->number_of_slots);
if (map->slots == NULL)
OUT_OF_MEMORY;
if (map->values == NULL)
OUT_OF_MEMORY;
for (i = 0; i < old_number_of_slots; i++)
if (old_slots[i] != OBJC_MAP_PRIVATE_EMPTY_SLOT)
{
size_t k = IDENTIFIER_HASH_VALUE (old_slots[i]) & map->mask;
if (map->slots[k] == OBJC_MAP_PRIVATE_EMPTY_SLOT)
{
map->slots[k] = old_slots[i];
map->values[k] = old_values[i];
}
else
{
size_t j = 1;
while (1)
{
k = (k + j) & map->mask;
if (map->slots[k] == OBJC_MAP_PRIVATE_EMPTY_SLOT)
{
map->slots[k] = old_slots[i];
map->values[k] = old_values[i];
break;
}
j++;
}
}
}
ggc_free (old_slots);
ggc_free (old_values);
}
void
objc_map_private_grow (struct objc_map_private *map)
{
objc_map_private_resize (map, map->number_of_slots * 2);
}
#include "gt-objc-objc-map.h"
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