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/*
* 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),
#ifdef WITH_ASSERT
checked(0),
#endif /* WITH_ASSERT */
cleaning(false),
data(nullptr),
alloc_cache(nullptr)
{ }
/**
* 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 = std::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] == nullptr) 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) == nullptr
*/
DEFINE_POOL_METHOD(inline void *)::AllocateItem(size_t size, size_t index)
{
assert(this->data[index] == nullptr);
this->first_unused = std::max(this->first_unused, index + 1);
this->items++;
Titem *item;
if (Tcache && this->alloc_cache != nullptr) {
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 = (Tindex)(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 WITH_ASSERT
assert(this->checked != 0);
this->checked--;
#endif /* WITH_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 SlErrorCorruptFmt() on failure! (index out of range or already used)
*/
DEFINE_POOL_METHOD(void *)::GetNew(size_t size, size_t index)
{
extern void NORETURN SlErrorCorruptFmt(const char *format, ...);
if (index >= Tmax_size) {
SlErrorCorruptFmt("%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] != nullptr) {
SlErrorCorruptFmt("%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-nullptr)
* @note 'delete nullptr' 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] != nullptr);
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] = nullptr;
this->first_free = std::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 nullptr;' is very valid
}
assert(this->items == 0);
free(this->data);
this->first_unused = this->first_free = this->size = 0;
this->data = nullptr;
this->cleaning = false;
if (Tcache) {
while (this->alloc_cache != nullptr) {
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 */
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