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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_GLOBAL_VALUE_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_GLOBAL_VALUE_MAP_H_
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "v8/include/v8-util.h"
#include "v8/include/v8.h"
namespace blink {
/**
* A Traits class for v8::GlobalValueMap that uses wtf/HashMap as a
* backing store.
*
* The parameter is_weak will determine whether the references are 'weak'.
* If so, entries will be removed from the map as the weak references are
* collected.
*/
template <typename KeyType,
typename ValueType,
v8::PersistentContainerCallbackType type>
class V8GlobalValueMapTraits {
STATIC_ONLY(V8GlobalValueMapTraits);
public:
// Map traits:
typedef HashMap<KeyType, v8::PersistentContainerValue> Impl;
typedef typename Impl::iterator Iterator;
static size_t Size(const Impl* impl) { return impl->size(); }
static bool Empty(Impl* impl) { return impl->empty(); }
static void Swap(Impl& impl, Impl& other) { impl.swap(other); }
static Iterator Begin(Impl* impl) { return impl->begin(); }
static Iterator End(Impl* impl) { return impl->end(); }
static v8::PersistentContainerValue Value(Iterator& iter) {
return iter->value;
}
static KeyType Key(Iterator& iter) { return iter->key; }
static v8::PersistentContainerValue Set(Impl* impl,
KeyType key,
v8::PersistentContainerValue value) {
v8::PersistentContainerValue old_value = Get(impl, key);
impl->Set(key, value);
return old_value;
}
static v8::PersistentContainerValue Get(const Impl* impl, KeyType key) {
auto it = impl->find(key);
return it != impl->end() ? it->value : 0;
}
static v8::PersistentContainerValue Remove(Impl* impl, KeyType key) {
return impl->Take(key);
}
// Weak traits:
static const v8::PersistentContainerCallbackType kCallbackType = type;
typedef v8::GlobalValueMap<KeyType,
ValueType,
V8GlobalValueMapTraits<KeyType, ValueType, type>>
MapType;
typedef void WeakCallbackDataType;
static WeakCallbackDataType* WeakCallbackParameter(
MapType* map,
KeyType key,
const v8::Local<ValueType>& value) {
return nullptr;
}
static void DisposeCallbackData(WeakCallbackDataType* callback_data) {}
static MapType* MapFromWeakCallbackInfo(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {
return nullptr;
}
static KeyType KeyFromWeakCallbackInfo(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {
return KeyType();
}
static void OnWeakCallback(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {}
// Dispose traits:
static void Dispose(v8::Isolate* isolate,
v8::Global<ValueType> value,
KeyType key) {}
static void DisposeWeak(
const v8::WeakCallbackInfo<WeakCallbackDataType>& data) {}
};
/**
* A map for safely storing persistent V8 values, based on
* v8::GlobalValueMap.
*/
template <typename KeyType, typename ValueType>
class V8GlobalValueMap
: public v8::GlobalValueMap<
KeyType,
ValueType,
V8GlobalValueMapTraits<KeyType, ValueType, v8::kNotWeak>> {
DISALLOW_NEW();
public:
typedef V8GlobalValueMapTraits<KeyType, ValueType, v8::kNotWeak> Traits;
explicit V8GlobalValueMap(v8::Isolate* isolate)
: v8::GlobalValueMap<KeyType, ValueType, Traits>(isolate) {}
V8GlobalValueMap(v8::Isolate* isolate, const char* label)
: v8::GlobalValueMap<KeyType, ValueType, Traits>(isolate, label) {}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_GLOBAL_VALUE_MAP_H_
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