third_party/WebKit/Source/core/dom/DocumentParserTiming.cpp

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/dom/DocumentParserTiming.h"

#include "core/dom/Document.h"
#include "core/loader/DocumentLoader.h"
#include "platform/instrumentation/tracing/TraceEvent.h"

namespace blink {

static const char kSupplementName[] = "DocumentParserTiming";

DocumentParserTiming& DocumentParserTiming::from(Document& document) {
  DocumentParserTiming* timing = static_cast<DocumentParserTiming*>(
      Supplement<Document>::from(document, kSupplementName));
  if (!timing) {
    timing = new DocumentParserTiming(document);
    Supplement<Document>::provideTo(document, kSupplementName, timing);
  }
  return *timing;
}

void DocumentParserTiming::markParserStart() {
  if (m_parserDetached || m_parserStart > 0.0)
    return;
  DCHECK_EQ(m_parserStop, 0.0);
  m_parserStart = monotonicallyIncreasingTime();
  notifyDocumentParserTimingChanged();
}

void DocumentParserTiming::markParserStop() {
  if (m_parserDetached || m_parserStart == 0.0 || m_parserStop > 0.0)
    return;
  m_parserStop = monotonicallyIncreasingTime();
  notifyDocumentParserTimingChanged();
}

void DocumentParserTiming::markParserDetached() {
  DCHECK_GT(m_parserStart, 0.0);
  m_parserDetached = true;
}

void DocumentParserTiming::recordParserBlockedOnScriptLoadDuration(
    double duration,
    bool scriptInsertedViaDocumentWrite) {
  if (m_parserDetached || m_parserStart == 0.0 || m_parserStop > 0.0)
    return;
  m_parserBlockedOnScriptLoadDuration += duration;
  if (scriptInsertedViaDocumentWrite)
    m_parserBlockedOnScriptLoadFromDocumentWriteDuration += duration;
  notifyDocumentParserTimingChanged();
}

void DocumentParserTiming::recordParserBlockedOnScriptExecutionDuration(
    double duration,
    bool scriptInsertedViaDocumentWrite) {
  if (m_parserDetached || m_parserStart == 0.0 || m_parserStop > 0.0)
    return;
  m_parserBlockedOnScriptExecutionDuration += duration;
  if (scriptInsertedViaDocumentWrite)
    m_parserBlockedOnScriptExecutionFromDocumentWriteDuration += duration;
  notifyDocumentParserTimingChanged();
}

DEFINE_TRACE(DocumentParserTiming) {
  Supplement<Document>::trace(visitor);
}

DocumentParserTiming::DocumentParserTiming(Document& document)
    : Supplement<Document>(document) {}

void DocumentParserTiming::notifyDocumentParserTimingChanged() {
  if (supplementable()->loader())
    supplementable()->loader()->didChangePerformanceTiming();
}

}  // namespace blink