/** ****************************************************************************** * Xenia : Xbox 360 Emulator Research Project * ****************************************************************************** * Copyright 2013 Ben Vanik. All rights reserved. * * Released under the BSD license - see LICENSE in the root for more details. * ****************************************************************************** */ #include using namespace alloy; Arena::Arena(size_t chunk_size) : chunk_size_(chunk_size), head_chunk_(NULL), active_chunk_(NULL) { } Arena::~Arena() { Reset(); Chunk* chunk = head_chunk_; while (chunk) { Chunk* next = chunk->next; delete chunk; chunk = next; } head_chunk_ = NULL; } void Arena::Reset() { active_chunk_ = head_chunk_; if (active_chunk_) { active_chunk_->offset = 0; } } void* Arena::Alloc(size_t size) { if (active_chunk_) { if (active_chunk_->capacity - active_chunk_->offset < size) { Chunk* next = active_chunk_->next; if (!next) { XEASSERT(size < chunk_size_); // need to support larger chunks next = new Chunk(chunk_size_); active_chunk_->next = next; } active_chunk_ = next; } } else { head_chunk_ = active_chunk_ = new Chunk(chunk_size_); } uint8_t* p = active_chunk_->buffer + active_chunk_->offset; active_chunk_->offset += size; return p; } void* Arena::CloneContents() { size_t total_length = 0; Chunk* chunk = head_chunk_; while (chunk) { total_length += chunk->offset; if (chunk == active_chunk_) { break; } chunk = chunk->next; } void* result = xe_malloc(total_length); uint8_t* p = (uint8_t*)result; chunk = head_chunk_; while (chunk) { xe_copy_struct(p, chunk->buffer, chunk->offset); p += chunk->offset; if (chunk == active_chunk_) { break; } chunk = chunk->next; } return result; } Arena::Chunk::Chunk(size_t chunk_size) : next(NULL), capacity(chunk_size), buffer(0), offset(0) { buffer = (uint8_t*)xe_malloc(capacity); } Arena::Chunk::~Chunk() { if (buffer) { xe_free(buffer); } }