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      1 /*
      2  * Copyright (C) 2007-2009 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/ScheduledAction.h"
     33 
     34 #include "bindings/v8/ScriptController.h"
     35 #include "bindings/v8/ScriptSourceCode.h"
     36 #include "bindings/v8/V8Binding.h"
     37 #include "bindings/v8/V8GCController.h"
     38 #include "bindings/v8/V8ScriptRunner.h"
     39 #include "core/dom/Document.h"
     40 #include "core/dom/ExecutionContext.h"
     41 #include "core/frame/Frame.h"
     42 #include "core/workers/WorkerGlobalScope.h"
     43 #include "core/workers/WorkerThread.h"
     44 #include "platform/TraceEvent.h"
     45 
     46 namespace WebCore {
     47 
     48 ScheduledAction::ScheduledAction(v8::Handle<v8::Context> context, v8::Handle<v8::Function> function, int argc, v8::Handle<v8::Value> argv[], v8::Isolate* isolate)
     49     : m_context(isolate, context)
     50     , m_function(isolate, function)
     51     , m_code(String(), KURL(), TextPosition::belowRangePosition())
     52     , m_isolate(isolate)
     53 {
     54     m_info.reserveCapacity(argc);
     55     for (int i = 0; i < argc; ++i)
     56         m_info.append(UnsafePersistent<v8::Value>(m_isolate, argv[i]));
     57 }
     58 
     59 ScheduledAction::ScheduledAction(v8::Handle<v8::Context> context, const String& code, const KURL& url, v8::Isolate* isolate)
     60     : m_context(isolate, context)
     61     , m_code(code, url)
     62     , m_isolate(isolate)
     63 {
     64 }
     65 
     66 ScheduledAction::~ScheduledAction()
     67 {
     68     for (size_t i = 0; i < m_info.size(); ++i)
     69         m_info[i].dispose();
     70 }
     71 
     72 void ScheduledAction::execute(ExecutionContext* context)
     73 {
     74     if (context->isDocument()) {
     75         Frame* frame = toDocument(context)->frame();
     76         if (!frame)
     77             return;
     78         if (!frame->script().canExecuteScripts(AboutToExecuteScript))
     79             return;
     80         execute(frame);
     81     } else {
     82         execute(toWorkerGlobalScope(context));
     83     }
     84 }
     85 
     86 void ScheduledAction::execute(Frame* frame)
     87 {
     88     v8::HandleScope handleScope(m_isolate);
     89 
     90     v8::Handle<v8::Context> context = m_context.newLocal(m_isolate);
     91     if (context.IsEmpty())
     92         return;
     93 
     94     TRACE_EVENT0("v8", "ScheduledAction::execute");
     95 
     96     if (!m_function.isEmpty()) {
     97         v8::Context::Scope scope(context);
     98         Vector<v8::Handle<v8::Value> > info;
     99         createLocalHandlesForArgs(&info);
    100         frame->script().callFunction(m_function.newLocal(m_isolate), context->Global(), info.size(), info.data());
    101     } else {
    102         frame->script().executeScriptAndReturnValue(context, ScriptSourceCode(m_code));
    103     }
    104 
    105     // The frame might be invalid at this point because JavaScript could have released it.
    106 }
    107 
    108 void ScheduledAction::execute(WorkerGlobalScope* worker)
    109 {
    110     ASSERT(worker->thread()->isCurrentThread());
    111     v8::HandleScope handleScope(m_isolate);
    112     v8::Handle<v8::Context> context = m_context.newLocal(m_isolate);
    113     ASSERT(!context.IsEmpty());
    114     v8::Context::Scope scope(context);
    115     if (!m_function.isEmpty()) {
    116         Vector<v8::Handle<v8::Value> > info;
    117         createLocalHandlesForArgs(&info);
    118         V8ScriptRunner::callFunction(m_function.newLocal(m_isolate), worker, context->Global(), info.size(), info.data(), m_isolate);
    119     } else
    120         worker->script()->evaluate(m_code);
    121 }
    122 
    123 void ScheduledAction::createLocalHandlesForArgs(Vector<v8::Handle<v8::Value> >* handles)
    124 {
    125     handles->reserveCapacity(m_info.size());
    126     for (size_t i = 0; i < m_info.size(); ++i)
    127         handles->append(m_info[i].newLocal(m_isolate));
    128 }
    129 
    130 } // namespace WebCore
    131