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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __LINKER_ALLOCATOR_H
#define __LINKER_ALLOCATOR_H
#include <stdlib.h>
#include <limits.h>
#include "private/bionic_macros.h"
struct LinkerAllocatorPage;
/*
* This class is a non-template version of the LinkerAllocator
* It keeps code inside .cpp file by keeping the interface
* template-free.
*
* Please use LinkerAllocator<type> where possible (everywhere).
*/
class LinkerBlockAllocator {
public:
explicit LinkerBlockAllocator(size_t block_size);
void* alloc();
void free(void* block);
void protect_all(int prot);
private:
void create_new_page();
LinkerAllocatorPage* find_page(void* block);
size_t block_size_;
LinkerAllocatorPage* page_list_;
void* free_block_list_;
DISALLOW_COPY_AND_ASSIGN(LinkerBlockAllocator);
};
/*
* We can't use malloc(3) in the dynamic linker.
*
* A simple allocator for the dynamic linker. An allocator allocates instances
* of a single fixed-size type. Allocations are backed by page-sized private
* anonymous mmaps.
*/
template<typename T>
class LinkerAllocator {
public:
LinkerAllocator() : block_allocator_(sizeof(T)) {}
T* alloc() { return reinterpret_cast<T*>(block_allocator_.alloc()); }
void free(T* t) { block_allocator_.free(t); }
void protect_all(int prot) { block_allocator_.protect_all(prot); }
private:
LinkerBlockAllocator block_allocator_;
DISALLOW_COPY_AND_ASSIGN(LinkerAllocator);
};
#endif // __LINKER_ALLOCATOR_H
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