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// Copyright 2014 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_ZONE_ZONE_ALLOCATOR_H_
#define V8_ZONE_ZONE_ALLOCATOR_H_
#include <limits>
#include "src/zone/zone.h"
namespace v8 {
namespace internal {
template <typename T>
class zone_allocator {
public:
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
template <class O>
struct rebind {
typedef zone_allocator<O> other;
};
#ifdef V8_CC_MSVC
// MSVS unfortunately requires the default constructor to be defined.
zone_allocator() : zone_(nullptr) { UNREACHABLE(); }
#endif
explicit zone_allocator(Zone* zone) throw() : zone_(zone) {}
explicit zone_allocator(const zone_allocator& other) throw()
: zone_(other.zone_) {}
template <typename U>
zone_allocator(const zone_allocator<U>& other) throw() : zone_(other.zone_) {}
template <typename U>
friend class zone_allocator;
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
pointer allocate(size_type n, const void* hint = 0) {
return static_cast<pointer>(
zone_->NewArray<value_type>(static_cast<int>(n)));
}
void deallocate(pointer p, size_type) { /* noop for Zones */
}
size_type max_size() const throw() {
return std::numeric_limits<int>::max() / sizeof(value_type);
}
template <typename U, typename... Args>
void construct(U* p, Args&&... args) {
void* v_p = const_cast<void*>(static_cast<const void*>(p));
new (v_p) U(std::forward<Args>(args)...);
}
template <typename U>
void destroy(U* p) {
p->~U();
}
bool operator==(zone_allocator const& other) const {
return zone_ == other.zone_;
}
bool operator!=(zone_allocator const& other) const {
return zone_ != other.zone_;
}
Zone* zone() { return zone_; }
private:
Zone* zone_;
};
typedef zone_allocator<bool> ZoneBoolAllocator;
typedef zone_allocator<int> ZoneIntAllocator;
} // namespace internal
} // namespace v8
#endif // V8_ZONE_ZONE_ALLOCATOR_H_
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