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 }