| /* |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_VALUE_CACHE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_VALUE_CACHE_H_ |
| |
| #include "base/macros.h" |
| #include "base/memory/scoped_refptr.h" |
| #include "third_party/blink/renderer/platform/bindings/parkable_string.h" |
| #include "third_party/blink/renderer/platform/bindings/v8_global_value_map.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/hash_map.h" |
| #include "third_party/blink/renderer/platform/wtf/text/atomic_string.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| #include "v8/include/v8.h" |
| |
| namespace blink { |
| |
| class StringCacheMapTraits |
| : public V8GlobalValueMapTraits<StringImpl*, |
| v8::String, |
| v8::kWeakWithParameter> { |
| STATIC_ONLY(StringCacheMapTraits); |
| |
| public: |
| // Weak traits: |
| typedef StringImpl WeakCallbackDataType; |
| typedef v8::GlobalValueMap<StringImpl*, v8::String, StringCacheMapTraits> |
| MapType; |
| |
| static WeakCallbackDataType* WeakCallbackParameter( |
| MapType* map, |
| StringImpl* key, |
| v8::Local<v8::String>& value) { |
| return key; |
| } |
| static void DisposeCallbackData(WeakCallbackDataType* callback_data) {} |
| |
| static MapType* MapFromWeakCallbackInfo( |
| const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| |
| static StringImpl* KeyFromWeakCallbackInfo( |
| const v8::WeakCallbackInfo<WeakCallbackDataType>& data) { |
| return data.GetParameter(); |
| } |
| |
| static void OnWeakCallback(const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| |
| static void Dispose(v8::Isolate*, |
| v8::Global<v8::String> value, |
| StringImpl* key); |
| static void DisposeWeak(const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| }; |
| |
| class ParkableStringCacheMapTraits |
| : public V8GlobalValueMapTraits<ParkableStringImpl*, |
| v8::String, |
| v8::kWeakWithParameter> { |
| STATIC_ONLY(ParkableStringCacheMapTraits); |
| |
| public: |
| // Weak traits: |
| typedef ParkableStringImpl WeakCallbackDataType; |
| typedef v8::GlobalValueMap<ParkableStringImpl*, |
| v8::String, |
| ParkableStringCacheMapTraits> |
| MapType; |
| |
| static WeakCallbackDataType* WeakCallbackParameter( |
| MapType* map, |
| ParkableStringImpl* key, |
| v8::Local<v8::String>& value) { |
| return key; |
| } |
| static void DisposeCallbackData(WeakCallbackDataType* callback_data) {} |
| |
| static MapType* MapFromWeakCallbackInfo( |
| const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| |
| static ParkableStringImpl* KeyFromWeakCallbackInfo( |
| const v8::WeakCallbackInfo<WeakCallbackDataType>& data) { |
| return data.GetParameter(); |
| } |
| |
| static void OnWeakCallback(const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| |
| static void Dispose(v8::Isolate*, |
| v8::Global<v8::String> value, |
| ParkableStringImpl* key); |
| static void DisposeWeak(const v8::WeakCallbackInfo<WeakCallbackDataType>&); |
| }; |
| |
| // String cache helps convert WTF strings (StringImpl*) into v8 strings by |
| // only creating a v8::String for a particular StringImpl* once and caching it |
| // for future use. It is held by and can be retrieved from V8PerIsolateData, and |
| // is cleared when the isolate is destroyed. Entries are removed from the |
| // backing global value map when weak references to the values are collected. |
| class PLATFORM_EXPORT StringCache { |
| USING_FAST_MALLOC(StringCache); |
| |
| public: |
| explicit StringCache(v8::Isolate* isolate) |
| : string_cache_(isolate), parkable_string_cache_(isolate) {} |
| |
| v8::Local<v8::String> V8ExternalString(v8::Isolate* isolate, |
| StringImpl* string_impl) { |
| DCHECK(string_impl); |
| if (last_string_impl_.get() == string_impl) |
| return last_v8_string_.NewLocal(isolate); |
| return V8ExternalStringSlow(isolate, string_impl); |
| } |
| |
| v8::Local<v8::String> V8ExternalString(v8::Isolate* isolate, |
| const ParkableString& string); |
| |
| void SetReturnValueFromString(v8::ReturnValue<v8::Value> return_value, |
| StringImpl* string_impl) { |
| DCHECK(string_impl); |
| if (last_string_impl_.get() == string_impl) |
| last_v8_string_.SetReturnValue(return_value); |
| else |
| SetReturnValueFromStringSlow(return_value, string_impl); |
| } |
| |
| void Dispose(); |
| |
| friend class StringCacheMapTraits; |
| friend class ParkableStringCacheMapTraits; |
| |
| private: |
| v8::Local<v8::String> V8ExternalStringSlow(v8::Isolate*, StringImpl*); |
| void SetReturnValueFromStringSlow(v8::ReturnValue<v8::Value>, StringImpl*); |
| v8::Local<v8::String> CreateStringAndInsertIntoCache(v8::Isolate*, |
| StringImpl*); |
| v8::Local<v8::String> CreateStringAndInsertIntoCache(v8::Isolate*, |
| const ParkableString&); |
| void InvalidateLastString(); |
| |
| StringCacheMapTraits::MapType string_cache_; |
| StringCacheMapTraits::MapType::PersistentValueReference last_v8_string_; |
| ParkableStringCacheMapTraits::MapType parkable_string_cache_; |
| |
| // Note: RefPtr is a must as we cache by StringImpl* equality, not identity |
| // hence lastStringImpl might be not a key of the cache (in sense of identity) |
| // and hence it's not refed on addition. |
| scoped_refptr<StringImpl> last_string_impl_; |
| |
| DISALLOW_COPY_AND_ASSIGN(StringCache); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_VALUE_CACHE_H_ |