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// Copyright 2019 The Chromium 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 THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "v8/include/v8.h"
namespace blink {
// BoxedV8Module wraps a handle to a v8::Module for use on heap.
//
// Hash of Member<BoxedV8Module> overrides HashTraits.
// Therefore, BoxedV8Module can be a key/value type of WTF::HashMap,
// HashSet,HashTable by using BoxedV8ModuleHash.
class CORE_EXPORT BoxedV8Module final : public GarbageCollected<BoxedV8Module> {
public:
BoxedV8Module(v8::Isolate* isolate, v8::Local<v8::Module> module)
: record_(isolate, module),
identity_hash_(static_cast<unsigned>(module->GetIdentityHash())) {}
void Trace(Visitor* visitor) const {
// TODO(keishi): Remove UnsafeCast.
visitor->Trace(record_.UnsafeCast<v8::Value>());
}
v8::Local<v8::Module> NewLocal(v8::Isolate* isolate) const {
return record_.NewLocal(isolate);
}
private:
// TODO(keishi): Visitor only defines a trace method for v8::Value so this
// needs to be cast.
GC_PLUGIN_IGNORE("757708")
TraceWrapperV8Reference<v8::Module> record_;
const unsigned identity_hash_;
friend struct BoxedV8ModuleHash;
};
struct BoxedV8ModuleHash {
public:
static unsigned GetHash(const Member<BoxedV8Module>& key) {
return key->identity_hash_;
}
static bool Equal(const Member<BoxedV8Module>& a,
const Member<BoxedV8Module>& b) {
if (a.IsHashTableDeletedValue() && b.IsHashTableDeletedValue())
return true;
if (a.IsHashTableDeletedValue() || b.IsHashTableDeletedValue())
return false;
if (!a && !b)
return true;
if (!a || !b)
return false;
return a->record_ == b->record_;
}
static constexpr bool safe_to_compare_to_empty_or_deleted = true;
};
} // namespace blink
namespace WTF {
template <>
struct DefaultHash<blink::Member<blink::BoxedV8Module>> {
using Hash = blink::BoxedV8ModuleHash;
};
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_
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