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/* Copyright (C) 2007-2010 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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 General Public License for more details.
*/
/*
* Contains implementation of class ElfAllocator, that implements memory
* allocations for DWARF objects.
*/
#include "elf_alloc.h"
#include "elf_file.h"
ElfAllocator::ElfAllocator()
: current_chunk_(NULL) {
}
ElfAllocator::~ElfAllocator() {
ElfAllocatorChunk* chunk_to_free = current_chunk_;
while (chunk_to_free != NULL) {
ElfAllocatorChunk* next_chunk = chunk_to_free->prev;
free(chunk_to_free);
chunk_to_free = next_chunk;
}
}
void* ElfAllocator::alloc(size_t size) {
/* Lets keep everyting properly aligned. */
size = (size + ELFALLOC_ALIGNMENT_MASK) & ~ELFALLOC_ALIGNMENT_MASK;
if (current_chunk_ == NULL || current_chunk_->remains < size) {
/* Allocate new chunk. */
ElfAllocatorChunk* new_chunk =
reinterpret_cast<ElfAllocatorChunk*>(malloc(ELF_ALLOC_CHUNK_SIZE));
assert(new_chunk != NULL);
if (new_chunk == NULL) {
_set_errno(ENOMEM);
return NULL;
}
new_chunk->size = ELF_ALLOC_CHUNK_SIZE;
new_chunk->avail = INC_PTR(new_chunk, sizeof(ElfAllocatorChunk));
new_chunk->remains = new_chunk->size - sizeof(ElfAllocatorChunk);
new_chunk->prev = current_chunk_;
current_chunk_ = new_chunk;
}
void* ret = current_chunk_->avail;
current_chunk_->remains -= size;
current_chunk_->avail = INC_PTR(current_chunk_->avail, size);
return ret;
}
void* DwarfAllocBase::operator new(size_t size, const ElfFile* elf) {
return elf->allocator()->alloc(size);
}
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