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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 "ScheduledAction.h"
     33 
     34 #include "Document.h"
     35 #include "ScriptExecutionContext.h"
     36 #include "ScriptSourceCode.h"
     37 
     38 #include "V8Binding.h"
     39 #include "V8Proxy.h"
     40 #include "WorkerContext.h"
     41 #include "WorkerContextExecutionProxy.h"
     42 #include "WorkerThread.h"
     43 
     44 namespace WebCore {
     45 
     46 ScheduledAction::ScheduledAction(v8::Handle<v8::Context> context, v8::Handle<v8::Function> func, int argc, v8::Handle<v8::Value> argv[])
     47     : m_context(context)
     48     , m_code(String(), KURL(), TextPosition1::belowRangePosition())
     49 {
     50     m_function = v8::Persistent<v8::Function>::New(func);
     51 
     52 #ifndef NDEBUG
     53     V8GCController::registerGlobalHandle(SCHEDULED_ACTION, this, m_function);
     54 #endif
     55 
     56     m_argc = argc;
     57     if (argc > 0) {
     58         m_argv = new v8::Persistent<v8::Value>[argc];
     59         for (int i = 0; i < argc; i++) {
     60             m_argv[i] = v8::Persistent<v8::Value>::New(argv[i]);
     61 
     62 #ifndef NDEBUG
     63     V8GCController::registerGlobalHandle(SCHEDULED_ACTION, this, m_argv[i]);
     64 #endif
     65         }
     66     } else
     67         m_argv = 0;
     68 }
     69 
     70 ScheduledAction::~ScheduledAction()
     71 {
     72     if (m_function.IsEmpty())
     73         return;
     74 
     75 #ifndef NDEBUG
     76     V8GCController::unregisterGlobalHandle(this, m_function);
     77 #endif
     78     m_function.Dispose();
     79 
     80     for (int i = 0; i < m_argc; i++) {
     81 #ifndef NDEBUG
     82         V8GCController::unregisterGlobalHandle(this, m_argv[i]);
     83 #endif
     84         m_argv[i].Dispose();
     85     }
     86 
     87     if (m_argc > 0)
     88         delete[] m_argv;
     89 }
     90 
     91 void ScheduledAction::execute(ScriptExecutionContext* context)
     92 {
     93     V8Proxy* proxy = V8Proxy::retrieve(context);
     94     if (proxy)
     95         execute(proxy);
     96 #if ENABLE(WORKERS)
     97     else if (context->isWorkerContext())
     98         execute(static_cast<WorkerContext*>(context));
     99 #endif
    100     // It's possible that Javascript is disabled and that we have neither a V8Proxy
    101     // nor a WorkerContext.  Do nothing in that case.
    102 }
    103 
    104 void ScheduledAction::execute(V8Proxy* proxy)
    105 {
    106     ASSERT(proxy);
    107 
    108     v8::HandleScope handleScope;
    109     v8::Handle<v8::Context> v8Context = v8::Local<v8::Context>::New(m_context.get());
    110     if (v8Context.IsEmpty())
    111         return; // JS may not be enabled.
    112 
    113     v8::Context::Scope scope(v8Context);
    114 
    115     proxy->setTimerCallback(true);
    116 
    117     // FIXME: Need to implement timeouts for preempting a long-running script.
    118     if (!m_function.IsEmpty() && m_function->IsFunction()) {
    119         proxy->callFunction(v8::Persistent<v8::Function>::Cast(m_function), v8Context->Global(), m_argc, m_argv);
    120         Document::updateStyleForAllDocuments();
    121     } else
    122         proxy->evaluate(m_code, 0);
    123 
    124     proxy->setTimerCallback(false);
    125 }
    126 
    127 #if ENABLE(WORKERS)
    128 void ScheduledAction::execute(WorkerContext* workerContext)
    129 {
    130     // In a Worker, the execution should always happen on a worker thread.
    131     ASSERT(workerContext->thread()->threadID() == currentThread());
    132 
    133     WorkerScriptController* scriptController = workerContext->script();
    134 
    135     if (!m_function.IsEmpty() && m_function->IsFunction()) {
    136         v8::HandleScope handleScope;
    137         v8::Handle<v8::Context> v8Context = v8::Local<v8::Context>::New(m_context.get());
    138         ASSERT(!v8Context.IsEmpty());
    139         v8::Context::Scope scope(v8Context);
    140         m_function->Call(v8Context->Global(), m_argc, m_argv);
    141     } else
    142         scriptController->evaluate(m_code);
    143 }
    144 #endif
    145 
    146 } // namespace WebCore
    147