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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 "ScriptState.h"
     33 
     34 #include "Frame.h"
     35 #include "Node.h"
     36 #include "Page.h"
     37 #include "ScriptController.h"
     38 #include "V8HiddenPropertyName.h"
     39 
     40 #include <v8.h>
     41 #include <wtf/Assertions.h>
     42 
     43 namespace WebCore {
     44 
     45 ScriptState::ScriptState(v8::Handle<v8::Context> context)
     46     : m_context(v8::Persistent<v8::Context>::New(context))
     47 {
     48     m_context.MakeWeak(this, &ScriptState::weakReferenceCallback);
     49 }
     50 
     51 ScriptState::~ScriptState()
     52 {
     53     m_context.Dispose();
     54     m_context.Clear();
     55 }
     56 
     57 ScriptState* ScriptState::forContext(v8::Local<v8::Context> context)
     58 {
     59     v8::Context::Scope contextScope(context);
     60 
     61     v8::Local<v8::Object> global = context->Global();
     62     // Skip proxy object. The proxy object will survive page navigation while we need
     63     // an object whose lifetime consides with that of the inspected context.
     64     global = v8::Local<v8::Object>::Cast(global->GetPrototype());
     65 
     66     v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState();
     67     v8::Local<v8::Value> val = global->GetHiddenValue(key);
     68     if (!val.IsEmpty() && val->IsExternal())
     69         return static_cast<ScriptState*>(v8::External::Cast(*val)->Value());
     70 
     71     ScriptState* state = new ScriptState(context);
     72     global->SetHiddenValue(key, v8::External::New(state));
     73     return state;
     74 }
     75 
     76 ScriptState* ScriptState::current()
     77 {
     78     v8::HandleScope handleScope;
     79     v8::Local<v8::Context> context = v8::Context::GetCurrent();
     80     if (context.IsEmpty()) {
     81         ASSERT_NOT_REACHED();
     82         return 0;
     83     }
     84     return ScriptState::forContext(context);
     85 }
     86 
     87 void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
     88 {
     89     ScriptState* scriptState = static_cast<ScriptState*>(parameter);
     90     delete scriptState;
     91 }
     92 
     93 ScriptState* mainWorldScriptState(Frame* frame)
     94 {
     95     v8::HandleScope handleScope;
     96     V8Proxy* proxy = frame->script()->proxy();
     97     return ScriptState::forContext(proxy->mainWorldContext());
     98 }
     99 
    100 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node)
    101 {
    102     // This should be never reached with V8 bindings (WebKit only uses it
    103     // for non-JS bindings)
    104     ASSERT_NOT_REACHED();
    105     return 0;
    106 }
    107 
    108 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page)
    109 {
    110     // This should be only reached with V8 bindings from single process layout tests.
    111     return mainWorldScriptState(page->mainFrame());
    112 }
    113 
    114 }
    115