summaryrefslogtreecommitdiff
path: root/src/core/pool_func.hpp
blob: eafd057ee3ba8c322a6085a37d6feaf39c5a783c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file pool_func.hpp Some methods of Pool are placed here in order to reduce compilation time and binary size. */

#ifndef POOL_FUNC_HPP
#define POOL_FUNC_HPP

#include "alloc_func.hpp"
#include "mem_func.hpp"
#include "pool_type.hpp"

/**
 * Helper for defining the method's signature.
 * @param type The return type of the method.
 */
#define DEFINE_POOL_METHOD(type) \
	template <class Titem, typename Tindex, size_t Tgrowth_step, size_t Tmax_size, PoolType Tpool_type, bool Tcache, bool Tzero> \
	type Pool<Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero>

/**
 * Create a clean pool.
 * @param name The name for the pool.
 */
DEFINE_POOL_METHOD(inline)::Pool(const char *name) :
		PoolBase(Tpool_type),
		name(name),
		size(0),
		first_free(0),
		first_unused(0),
		items(0),
		cleaning(false),
		data(NULL),
		alloc_cache(NULL)
{ }

/**
 * Resizes the pool so 'index' can be addressed
 * @param index index we will allocate later
 * @pre index >= this->size
 * @pre index < Tmax_size
 */
DEFINE_POOL_METHOD(inline void)::ResizeFor(size_t index)
{
	assert(index >= this->size);
	assert(index < Tmax_size);

	size_t new_size = min(Tmax_size, Align(index + 1, Tgrowth_step));

	this->data = ReallocT(this->data, new_size);
	MemSetT(this->data + this->size, 0, new_size - this->size);

	this->size = new_size;
}

/**
 * Searches for first free index
 * @return first free index, NO_FREE_ITEM on failure
 */
DEFINE_POOL_METHOD(inline size_t)::FindFirstFree()
{
	size_t index = this->first_free;

	for (; index < this->first_unused; index++) {
		if (this->data[index] == NULL) return index;
	}

	if (index < this->size) {
		return index;
	}

	assert(index == this->size);
	assert(this->first_unused == this->size);

	if (index < Tmax_size) {
		this->ResizeFor(index);
		return index;
	}

	assert(this->items == Tmax_size);

	return NO_FREE_ITEM;
}

/**
 * Makes given index valid
 * @param size size of item
 * @param index index of item
 * @pre index < this->size
 * @pre this->Get(index) == NULL
 */
DEFINE_POOL_METHOD(inline void *)::AllocateItem(size_t size, size_t index)
{
	assert(this->data[index] == NULL);

	this->first_unused = max(this->first_unused, index + 1);
	this->items++;

	Titem *item;
	if (Tcache && this->alloc_cache != NULL) {
		assert(sizeof(Titem) == size);
		item = (Titem *)this->alloc_cache;
		this->alloc_cache = this->alloc_cache->next;
		if (Tzero) {
			/* Explicitly casting to (void *) prevents a clang warning -
			 * we are actually memsetting a (not-yet-constructed) object */
			memset((void *)item, 0, sizeof(Titem));
		}
	} else if (Tzero) {
		item = (Titem *)CallocT<byte>(size);
	} else {
		item = (Titem *)MallocT<byte>(size);
	}
	this->data[index] = item;
	item->index = (uint)index;
	return item;
}

/**
 * Allocates new item
 * @param size size of item
 * @return pointer to allocated item
 * @note error() on failure! (no free item)
 */
DEFINE_POOL_METHOD(void *)::GetNew(size_t size)
{
	size_t index = this->FindFirstFree();

#ifdef OTTD_ASSERT
	assert(this->checked != 0);
	this->checked--;
#endif /* OTTD_ASSERT */
	if (index == NO_FREE_ITEM) {
		error("%s: no more free items", this->name);
	}

	this->first_free = index + 1;
	return this->AllocateItem(size, index);
}

/**
 * Allocates new item with given index
 * @param size size of item
 * @param index index of item
 * @return pointer to allocated item
 * @note usererror() on failure! (index out of range or already used)
 */
DEFINE_POOL_METHOD(void *)::GetNew(size_t size, size_t index)
{
	if (index >= Tmax_size) {
		usererror("failed loading savegame: %s index " PRINTF_SIZE " out of range (" PRINTF_SIZE ")", this->name, index, Tmax_size);
	}

	if (index >= this->size) this->ResizeFor(index);

	if (this->data[index] != NULL) {
		usererror("failed loading savegame: %s index " PRINTF_SIZE " already in use", this->name, index);
	}

	return this->AllocateItem(size, index);
}

/**
 * Deallocates memory used by this index and marks item as free
 * @param index item to deallocate
 * @pre unit is allocated (non-NULL)
 * @note 'delete NULL' doesn't cause call of this function, so it is safe
 */
DEFINE_POOL_METHOD(void)::FreeItem(size_t index)
{
	assert(index < this->size);
	assert(this->data[index] != NULL);
	if (Tcache) {
		AllocCache *ac = (AllocCache *)this->data[index];
		ac->next = this->alloc_cache;
		this->alloc_cache = ac;
	} else {
		free(this->data[index]);
	}
	this->data[index] = NULL;
	this->first_free = min(this->first_free, index);
	this->items--;
	if (!this->cleaning) Titem::PostDestructor(index);
}

/** Destroys all items in the pool and resets all member variables. */
DEFINE_POOL_METHOD(void)::CleanPool()
{
	this->cleaning = true;
	for (size_t i = 0; i < this->first_unused; i++) {
		delete this->Get(i); // 'delete NULL;' is very valid
	}
	assert(this->items == 0);
	free(this->data);
	this->first_unused = this->first_free = this->size = 0;
	this->data = NULL;
	this->cleaning = false;

	if (Tcache) {
		while (this->alloc_cache != NULL) {
			AllocCache *ac = this->alloc_cache;
			this->alloc_cache = ac->next;
			free(ac);
		}
	}
}

#undef DEFINE_POOL_METHOD

/**
 * Force instantiation of pool methods so we don't get linker errors.
 * Only methods accessed from methods defined in pool.hpp need to be
 * forcefully instantiated.
 */
#define INSTANTIATE_POOL_METHODS(name) \
	template void * name ## Pool::GetNew(size_t size); \
	template void * name ## Pool::GetNew(size_t size, size_t index); \
	template void name ## Pool::FreeItem(size_t index); \
	template void name ## Pool::CleanPool();

#endif /* POOL_FUNC_HPP */