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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HEAP_CPPGC_RAW_HEAP_H_
#define V8_HEAP_CPPGC_RAW_HEAP_H_
#include <iterator>
#include <memory>
#include <vector>
#include "include/cppgc/heap.h"
#include "src/base/logging.h"
#include "src/base/macros.h"
namespace cppgc {
namespace internal {
class HeapBase;
class BaseSpace;
// RawHeap is responsible for space management.
class V8_EXPORT_PRIVATE RawHeap final {
public:
// Normal spaces are used to store objects of different size classes:
// - kNormal1: < 32 bytes
// - kNormal2: < 64 bytes
// - kNormal3: < 128 bytes
// - kNormal4: >= 128 bytes
//
// Objects of size greater than 2^16 get stored in the large space.
//
// Users can override where objects are allocated via cppgc::CustomSpace to
// force allocation in a custom space.
enum class RegularSpaceType : uint8_t {
kNormal1,
kNormal2,
kNormal3,
kNormal4,
kLarge,
};
static constexpr size_t kNumberOfRegularSpaces =
static_cast<size_t>(RegularSpaceType::kLarge) + 1;
using Spaces = std::vector<std::unique_ptr<BaseSpace>>;
using iterator = Spaces::iterator;
using const_iterator = Spaces::const_iterator;
explicit RawHeap(HeapBase* heap, size_t custom_spaces);
RawHeap(const RawHeap&) = delete;
RawHeap& operator=(const RawHeap&) = delete;
~RawHeap();
// Space iteration support.
iterator begin() { return spaces_.begin(); }
const_iterator begin() const { return spaces_.begin(); }
iterator end() { return spaces_.end(); }
const_iterator end() const { return spaces_.end(); }
iterator custom_begin() { return std::next(begin(), kNumberOfRegularSpaces); }
iterator custom_end() { return end(); }
size_t size() const { return spaces_.size(); }
BaseSpace* Space(RegularSpaceType type) {
const size_t index = static_cast<size_t>(type);
DCHECK_GT(kNumberOfRegularSpaces, index);
return Space(index);
}
const BaseSpace* Space(RegularSpaceType space) const {
return const_cast<RawHeap&>(*this).Space(space);
}
BaseSpace* CustomSpace(CustomSpaceIndex space_index) {
return Space(SpaceIndexForCustomSpace(space_index));
}
const BaseSpace* CustomSpace(CustomSpaceIndex space_index) const {
return const_cast<RawHeap&>(*this).CustomSpace(space_index);
}
HeapBase* heap() { return main_heap_; }
const HeapBase* heap() const { return main_heap_; }
private:
size_t SpaceIndexForCustomSpace(CustomSpaceIndex space_index) const {
DCHECK_LT(space_index.value, spaces_.size() - kNumberOfRegularSpaces);
return kNumberOfRegularSpaces + space_index.value;
}
BaseSpace* Space(size_t space_index) {
DCHECK_GT(spaces_.size(), space_index);
BaseSpace* space = spaces_[space_index].get();
DCHECK(space);
return space;
}
const BaseSpace* Space(size_t space_index) const {
return const_cast<RawHeap&>(*this).Space(space_index);
}
HeapBase* main_heap_;
Spaces spaces_;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_RAW_HEAP_H_
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