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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 "bindings/v8/ScriptState.h"
     33 
     34 #include "V8Window.h"
     35 #include "V8WorkerGlobalScope.h"
     36 #include "bindings/v8/ScriptController.h"
     37 #include "bindings/v8/V8HiddenPropertyName.h"
     38 #include "bindings/v8/WorkerScriptController.h"
     39 #include "core/frame/Frame.h"
     40 #include "core/workers/WorkerGlobalScope.h"
     41 #include <v8.h>
     42 #include "wtf/Assertions.h"
     43 
     44 namespace WebCore {
     45 
     46 ScriptState::ScriptState(v8::Handle<v8::Context> context)
     47     : m_context(context->GetIsolate(), context)
     48     , m_isolate(context->GetIsolate())
     49 {
     50     m_context.setWeak(this, &setWeakCallback);
     51 }
     52 
     53 ScriptState::~ScriptState()
     54 {
     55 }
     56 
     57 DOMWindow* ScriptState::domWindow() const
     58 {
     59     v8::HandleScope handleScope(m_isolate);
     60     return toDOMWindow(m_context.newLocal(m_isolate));
     61 }
     62 
     63 ExecutionContext* ScriptState::executionContext() const
     64 {
     65     v8::HandleScope handleScope(m_isolate);
     66     return toExecutionContext(m_context.newLocal(m_isolate));
     67 }
     68 
     69 ScriptState* ScriptState::forContext(v8::Handle<v8::Context> context)
     70 {
     71     v8::Context::Scope contextScope(context);
     72 
     73     v8::Local<v8::Object> innerGlobal = v8::Local<v8::Object>::Cast(context->Global()->GetPrototype());
     74 
     75     v8::Local<v8::Value> scriptStateWrapper = innerGlobal->GetHiddenValue(V8HiddenPropertyName::scriptState(context->GetIsolate()));
     76     if (!scriptStateWrapper.IsEmpty() && scriptStateWrapper->IsExternal())
     77         return static_cast<ScriptState*>(v8::External::Cast(*scriptStateWrapper)->Value());
     78 
     79     ScriptState* scriptState = new ScriptState(context);
     80     innerGlobal->SetHiddenValue(V8HiddenPropertyName::scriptState(context->GetIsolate()), v8::External::New(context->GetIsolate(), scriptState));
     81     return scriptState;
     82 }
     83 
     84 ScriptState* ScriptState::current()
     85 {
     86     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     87     v8::HandleScope handleScope(isolate);
     88     v8::Local<v8::Context> context = isolate->GetCurrentContext();
     89     ASSERT(!context.IsEmpty());
     90     return ScriptState::forContext(context);
     91 }
     92 
     93 void ScriptState::setWeakCallback(const v8::WeakCallbackData<v8::Context, ScriptState>& data)
     94 {
     95     delete data.GetParameter();
     96 }
     97 
     98 bool ScriptState::evalEnabled() const
     99 {
    100     v8::HandleScope handleScope(m_isolate);
    101     return context()->IsCodeGenerationFromStringsAllowed();
    102 }
    103 
    104 void ScriptState::setEvalEnabled(bool enabled)
    105 {
    106     v8::HandleScope handleScope(m_isolate);
    107     return context()->AllowCodeGenerationFromStrings(enabled);
    108 }
    109 
    110 ScriptState* mainWorldScriptState(Frame* frame)
    111 {
    112     v8::HandleScope handleScope(toIsolate(frame));
    113     return ScriptState::forContext(frame->script().mainWorldContext());
    114 }
    115 
    116 ScriptState* scriptStateFromWorkerGlobalScope(WorkerGlobalScope* workerGlobalScope)
    117 {
    118     WorkerScriptController* script = workerGlobalScope->script();
    119     if (!script)
    120         return 0;
    121 
    122     v8::HandleScope handleScope(script->isolate());
    123     return ScriptState::forContext(script->context());
    124 }
    125 
    126 }
    127