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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "js/WeakMapPtr.h"

#include "gc/WeakMap-inl.h"

//
// Machinery for the externally-linkable JS::WeakMapPtr, which wraps js::WeakMap
// for a few public data types.
//

using namespace js;

namespace WeakMapDetails {

template<typename T>
struct DataType
{
};

template<>
struct DataType<JSObject*>
{
    using BarrieredType = HeapPtr<JSObject*>;
    using HasherType = MovableCellHasher<BarrieredType>;
    static JSObject* NullValue() { return nullptr; }
};

template<>
struct DataType<JS::Value>
{
    using BarrieredType = HeapPtr<Value>;
    static JS::Value NullValue() { return JS::UndefinedValue(); }
};

template <typename K, typename V>
struct Utils
{
    typedef typename DataType<K>::BarrieredType KeyType;
    typedef typename DataType<V>::BarrieredType ValueType;
    typedef WeakMap<KeyType, ValueType> Type;
    typedef Type* PtrType;
    static PtrType cast(void* ptr) { return static_cast<PtrType>(ptr); }
};

} /* WeakMapDetails */

template <typename K, typename V>
void
JS::WeakMapPtr<K, V>::destroy()
{
    MOZ_ASSERT(initialized());
    js_delete(WeakMapDetails::Utils<K, V>::cast(ptr));
    ptr = nullptr;
}

template <typename K, typename V>
bool
JS::WeakMapPtr<K, V>::init(JSContext* cx)
{
    MOZ_ASSERT(!initialized());
    typename WeakMapDetails::Utils<K, V>::PtrType map =
        cx->new_<typename WeakMapDetails::Utils<K,V>::Type>(cx);
    if (!map)
        return false;
    ptr = map;
    return true;
}

template <typename K, typename V>
void
JS::WeakMapPtr<K, V>::trace(JSTracer* trc)
{
    MOZ_ASSERT(initialized());
    return WeakMapDetails::Utils<K, V>::cast(ptr)->trace(trc);
}

template <typename K, typename V>
V
JS::WeakMapPtr<K, V>::lookup(const K& key)
{
    MOZ_ASSERT(initialized());
    typename WeakMapDetails::Utils<K, V>::Type::Ptr result =
        WeakMapDetails::Utils<K, V>::cast(ptr)->lookup(key);
    if (!result)
        return WeakMapDetails::DataType<V>::NullValue();
    return result->value();
}

template <typename K, typename V>
bool
JS::WeakMapPtr<K, V>::put(JSContext* cx, const K& key, const V& value)
{
    MOZ_ASSERT(initialized());
    return WeakMapDetails::Utils<K, V>::cast(ptr)->put(key, value);
}

template <typename K, typename V>
V
JS::WeakMapPtr<K, V>::removeValue(const K& key)
{
    typedef typename WeakMapDetails::Utils<K, V>::Type Map;
    typedef typename Map::Ptr Ptr;

    MOZ_ASSERT(initialized());

    Map* map = WeakMapDetails::Utils<K, V>::cast(ptr);
    if (Ptr result = map->lookup(key)) {
        V value = result->value();
        map->remove(result);
        return value;
    }
    return WeakMapDetails::DataType<V>::NullValue();
}

//
// Supported specializations of JS::WeakMap:
//

template class JS_PUBLIC_API(JS::WeakMapPtr)<JSObject*, JSObject*>;

#ifdef DEBUG
// Nobody's using this at the moment, but we want to make sure it compiles.
template class JS_PUBLIC_API(JS::WeakMapPtr)<JSObject*, JS::Value>;
#endif