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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/V8HiddenPropertyName.h"
     33 
     34 #include "bindings/v8/V8Binding.h"
     35 #include <string.h>
     36 #include "wtf/StdLibExtras.h"
     37 #include "wtf/Vector.h"
     38 
     39 namespace WebCore {
     40 
     41 #define V8_AS_STRING(x) V8_AS_STRING_IMPL(x)
     42 #define V8_AS_STRING_IMPL(x) #x
     43 
     44 #define V8_HIDDEN_PROPERTY_PREFIX "WebCore::HiddenProperty::"
     45 
     46 #define V8_DEFINE_HIDDEN_PROPERTY(name) \
     47 v8::Handle<v8::String> V8HiddenPropertyName::name() \
     48 { \
     49     v8::Isolate* isolate = v8::Isolate::GetCurrent(); \
     50     V8HiddenPropertyName* hiddenPropertyName = V8PerIsolateData::from(isolate)->hiddenPropertyName(); \
     51     if (hiddenPropertyName->m_##name.IsEmpty()) { \
     52         createString(V8_HIDDEN_PROPERTY_PREFIX V8_AS_STRING(name), &(hiddenPropertyName->m_##name)); \
     53     } \
     54     return v8::Local<v8::String>::New(isolate, hiddenPropertyName->m_##name); \
     55 }
     56 
     57 V8_HIDDEN_PROPERTIES(V8_DEFINE_HIDDEN_PROPERTY);
     58 
     59 static v8::Handle<v8::String> hiddenReferenceName(const char* name, unsigned length)
     60 {
     61     ASSERT(length);
     62     Vector<char, 64> prefixedName;
     63     prefixedName.append(V8_HIDDEN_PROPERTY_PREFIX, sizeof(V8_HIDDEN_PROPERTY_PREFIX) - 1);
     64     prefixedName.append(name, length);
     65     return v8::String::NewSymbol(prefixedName.data(), static_cast<int>(prefixedName.size()));
     66 }
     67 
     68 void V8HiddenPropertyName::setNamedHiddenReference(v8::Handle<v8::Object> parent, const char* name, v8::Handle<v8::Value> child)
     69 {
     70     ASSERT(name);
     71     parent->SetHiddenValue(hiddenReferenceName(name, strlen(name)), child);
     72 }
     73 
     74 void V8HiddenPropertyName::createString(const char* key, v8::Persistent<v8::String>* handle)
     75 {
     76     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     77     v8::HandleScope scope(isolate);
     78     handle->Reset(isolate, v8::String::NewSymbol(key));
     79 }
     80 
     81 }  // namespace WebCore
     82