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      1 /*
      2  * Copyright (C) 2009, 2011 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 "WorkerContext.h"
     41 #include "WorkerContextExecutionProxy.h"
     42 #include "WorkerScriptController.h"
     43 
     44 #include <v8.h>
     45 #include <wtf/Assertions.h>
     46 
     47 namespace WebCore {
     48 
     49 ScriptState::ScriptState(v8::Handle<v8::Context> context)
     50     : m_context(v8::Persistent<v8::Context>::New(context))
     51 {
     52     m_context.MakeWeak(this, &ScriptState::weakReferenceCallback);
     53 }
     54 
     55 ScriptState::~ScriptState()
     56 {
     57     m_context.Dispose();
     58     m_context.Clear();
     59 }
     60 
     61 ScriptState* ScriptState::forContext(v8::Local<v8::Context> context)
     62 {
     63     v8::Context::Scope contextScope(context);
     64 
     65     v8::Local<v8::Object> global = context->Global();
     66     // Skip proxy object. The proxy object will survive page navigation while we need
     67     // an object whose lifetime consides with that of the inspected context.
     68     global = v8::Local<v8::Object>::Cast(global->GetPrototype());
     69 
     70     v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState();
     71     v8::Local<v8::Value> val = global->GetHiddenValue(key);
     72     if (!val.IsEmpty() && val->IsExternal())
     73         return static_cast<ScriptState*>(v8::External::Cast(*val)->Value());
     74 
     75     ScriptState* state = new ScriptState(context);
     76     global->SetHiddenValue(key, v8::External::New(state));
     77     return state;
     78 }
     79 
     80 ScriptState* ScriptState::current()
     81 {
     82     v8::HandleScope handleScope;
     83     v8::Local<v8::Context> context = v8::Context::GetCurrent();
     84     if (context.IsEmpty()) {
     85         ASSERT_NOT_REACHED();
     86         return 0;
     87     }
     88     return ScriptState::forContext(context);
     89 }
     90 
     91 void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
     92 {
     93     ScriptState* scriptState = static_cast<ScriptState*>(parameter);
     94     delete scriptState;
     95 }
     96 
     97 ScriptState* mainWorldScriptState(Frame* frame)
     98 {
     99     v8::HandleScope handleScope;
    100     V8Proxy* proxy = frame->script()->proxy();
    101     return ScriptState::forContext(proxy->mainWorldContext());
    102 }
    103 
    104 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node)
    105 {
    106     // This should be never reached with V8 bindings (WebKit only uses it
    107     // for non-JS bindings)
    108     ASSERT_NOT_REACHED();
    109     return 0;
    110 }
    111 
    112 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page)
    113 {
    114     // This should be only reached with V8 bindings from single process layout tests.
    115     return mainWorldScriptState(page->mainFrame());
    116 }
    117 
    118 #if ENABLE(WORKERS)
    119 ScriptState* scriptStateFromWorkerContext(WorkerContext* workerContext)
    120 {
    121     WorkerContextExecutionProxy* proxy = workerContext->script()->proxy();
    122     if (!proxy)
    123         return 0;
    124 
    125     v8::HandleScope handleScope;
    126     v8::Local<v8::Context> context = proxy->context();
    127     return ScriptState::forContext(context);
    128 }
    129 #endif
    130 
    131 }
    132