1 // Copyright 2019 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_ 6 #define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_ 7 8 #include "third_party/blink/renderer/core/core_export.h" 9 #include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h" 10 #include "third_party/blink/renderer/platform/heap/member.h" 11 #include "third_party/blink/renderer/platform/wtf/hash_functions.h" 12 #include "v8/include/v8.h" 13 14 namespace blink { 15 16 // BoxedV8Module wraps a handle to a v8::Module for use on heap. 17 // 18 // Hash of Member<BoxedV8Module> overrides HashTraits. 19 // Therefore, BoxedV8Module can be a key/value type of WTF::HashMap, 20 // HashSet,HashTable by using BoxedV8ModuleHash. 21 class CORE_EXPORT BoxedV8Module final : public GarbageCollected<BoxedV8Module> { 22 public: BoxedV8Module(v8::Isolate * isolate,v8::Local<v8::Module> module)23 BoxedV8Module(v8::Isolate* isolate, v8::Local<v8::Module> module) 24 : record_(isolate, module), 25 identity_hash_(static_cast<unsigned>(module->GetIdentityHash())) {} 26 Trace(Visitor * visitor)27 void Trace(Visitor* visitor) const { 28 // TODO(keishi): Remove UnsafeCast. 29 visitor->Trace(record_.UnsafeCast<v8::Value>()); 30 } 31 NewLocal(v8::Isolate * isolate)32 v8::Local<v8::Module> NewLocal(v8::Isolate* isolate) const { 33 return record_.NewLocal(isolate); 34 } 35 36 private: 37 // TODO(keishi): Visitor only defines a trace method for v8::Value so this 38 // needs to be cast. 39 GC_PLUGIN_IGNORE("757708") 40 TraceWrapperV8Reference<v8::Module> record_; 41 const unsigned identity_hash_; 42 friend struct BoxedV8ModuleHash; 43 }; 44 45 struct BoxedV8ModuleHash { 46 public: GetHashBoxedV8ModuleHash47 static unsigned GetHash(const Member<BoxedV8Module>& key) { 48 return key->identity_hash_; 49 } 50 EqualBoxedV8ModuleHash51 static bool Equal(const Member<BoxedV8Module>& a, 52 const Member<BoxedV8Module>& b) { 53 if (a.IsHashTableDeletedValue() && b.IsHashTableDeletedValue()) 54 return true; 55 if (a.IsHashTableDeletedValue() || b.IsHashTableDeletedValue()) 56 return false; 57 58 if (!a && !b) 59 return true; 60 if (!a || !b) 61 return false; 62 63 return a->record_ == b->record_; 64 } 65 66 static constexpr bool safe_to_compare_to_empty_or_deleted = true; 67 }; 68 69 } // namespace blink 70 71 namespace WTF { 72 73 template <> 74 struct DefaultHash<blink::Member<blink::BoxedV8Module>> { 75 using Hash = blink::BoxedV8ModuleHash; 76 }; 77 78 } // namespace WTF 79 80 #endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_BOXED_V8_MODULE_H_ 81