third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp

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#include "bindings/core/v8/ScheduledAction.h"

#include "bindings/core/v8/BindingSecurity.h"
#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/ScriptSourceCode.h"
#include "bindings/core/v8/SourceLocation.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8GCController.h"
#include "bindings/core/v8/V8ScriptRunner.h"
#include "core/dom/Document.h"
#include "core/dom/ExecutionContext.h"
#include "core/frame/LocalFrame.h"
#include "core/workers/WorkerGlobalScope.h"
#include "core/workers/WorkerThread.h"
#include "platform/instrumentation/tracing/TraceEvent.h"

namespace blink {

ScheduledAction* ScheduledAction::create(ScriptState* scriptState,
                                         ExecutionContext* target,
                                         const ScriptValue& handler,
                                         const Vector<ScriptValue>& arguments) {
  ASSERT(handler.isFunction());
  if (!scriptState->world().isWorkerWorld()) {
    DCHECK(BindingSecurity::shouldAllowAccessToFrame(
        enteredDOMWindow(scriptState->isolate()), toDocument(target)->frame(),
        BindingSecurity::ErrorReportOption::DoNotReport));
  }
  return new ScheduledAction(scriptState, handler, arguments);
}

ScheduledAction* ScheduledAction::create(ScriptState* scriptState,
                                         ExecutionContext* target,
                                         const String& handler) {
  if (!scriptState->world().isWorkerWorld()) {
    DCHECK(BindingSecurity::shouldAllowAccessToFrame(
        enteredDOMWindow(scriptState->isolate()), toDocument(target)->frame(),
        BindingSecurity::ErrorReportOption::DoNotReport));
  }
  return new ScheduledAction(scriptState, handler);
}

DEFINE_TRACE(ScheduledAction) {
  visitor->trace(m_code);
}

ScheduledAction::~ScheduledAction() {
  // Verify that owning DOMTimer has eagerly disposed.
  DCHECK(m_info.IsEmpty());
}

void ScheduledAction::dispose() {
  m_code.dispose();
  m_info.Clear();
  m_function.clear();
  m_scriptState.clear();
}

void ScheduledAction::execute(ExecutionContext* context) {
  if (context->isDocument()) {
    LocalFrame* frame = toDocument(context)->frame();
    if (!frame) {
      DVLOG(1) << "ScheduledAction::execute " << this << ": no frame";
      return;
    }
    if (!context->canExecuteScripts(AboutToExecuteScript)) {
      DVLOG(1) << "ScheduledAction::execute " << this
               << ": frame can not execute scripts";
      return;
    }
    execute(frame);
  } else {
    DVLOG(1) << "ScheduledAction::execute " << this << ": worker scope";
    execute(toWorkerGlobalScope(context));
  }
}

ScheduledAction::ScheduledAction(ScriptState* scriptState,
                                 const ScriptValue& function,
                                 const Vector<ScriptValue>& arguments)
    : m_scriptState(scriptState),
      m_info(scriptState->isolate()),
      m_code(String(), KURL(), TextPosition::belowRangePosition()) {
  ASSERT(function.isFunction());
  m_function.set(scriptState->isolate(),
                 v8::Local<v8::Function>::Cast(function.v8Value()));
  m_info.ReserveCapacity(arguments.size());
  for (const ScriptValue& argument : arguments)
    m_info.Append(argument.v8Value());
}

ScheduledAction::ScheduledAction(ScriptState* scriptState, const String& code)
    : m_scriptState(scriptState),
      m_info(scriptState->isolate()),
      m_code(code, KURL()) {}

void ScheduledAction::execute(LocalFrame* frame) {
  if (!m_scriptState->contextIsValid()) {
    DVLOG(1) << "ScheduledAction::execute " << this << ": context is empty";
    return;
  }

  TRACE_EVENT0("v8", "ScheduledAction::execute");
  ScriptState::Scope scope(m_scriptState.get());
  if (!m_function.isEmpty()) {
    DVLOG(1) << "ScheduledAction::execute " << this << ": have function";
    v8::Local<v8::Function> function =
        m_function.newLocal(m_scriptState->isolate());
    ScriptState* scriptStateForFunc =
        ScriptState::from(function->CreationContext());
    if (!scriptStateForFunc->contextIsValid()) {
      DVLOG(1) << "ScheduledAction::execute " << this
               << ": function's context is empty";
      return;
    }
    Vector<v8::Local<v8::Value>> info;
    createLocalHandlesForArgs(&info);
    V8ScriptRunner::callFunction(
        function, frame->document(), m_scriptState->context()->Global(),
        info.size(), info.data(), m_scriptState->isolate());
  } else {
    DVLOG(1) << "ScheduledAction::execute " << this
             << ": executing from source";
    frame->script().executeScriptAndReturnValue(m_scriptState->context(),
                                                ScriptSourceCode(m_code));
  }

  // The frame might be invalid at this point because JavaScript could have
  // released it.
}

void ScheduledAction::execute(WorkerGlobalScope* worker) {
  ASSERT(worker->thread()->isCurrentThread());

  if (!m_scriptState->contextIsValid()) {
    DVLOG(1) << "ScheduledAction::execute " << this << ": context is empty";
    return;
  }

  if (!m_function.isEmpty()) {
    ScriptState::Scope scope(m_scriptState.get());
    v8::Local<v8::Function> function =
        m_function.newLocal(m_scriptState->isolate());
    ScriptState* scriptStateForFunc =
        ScriptState::from(function->CreationContext());
    if (!scriptStateForFunc->contextIsValid()) {
      DVLOG(1) << "ScheduledAction::execute " << this
               << ": function's context is empty";
      return;
    }
    Vector<v8::Local<v8::Value>> info;
    createLocalHandlesForArgs(&info);
    V8ScriptRunner::callFunction(
        function, worker, m_scriptState->context()->Global(), info.size(),
        info.data(), m_scriptState->isolate());
  } else {
    worker->scriptController()->evaluate(m_code);
  }
}

void ScheduledAction::createLocalHandlesForArgs(
    Vector<v8::Local<v8::Value>>* handles) {
  handles->reserveCapacity(m_info.Size());
  for (size_t i = 0; i < m_info.Size(); ++i)
    handles->push_back(m_info.Get(i));
}

}  // namespace blink