DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (35bba5f95485)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_JavascriptTimelineMarker_h_
#define mozilla_JavascriptTimelineMarker_h_

#include "TimelineMarker.h"

#include "mozilla/Maybe.h"

#include "mozilla/dom/ProfileTimelineMarkerBinding.h"
#include "mozilla/dom/RootedDictionary.h"
#include "mozilla/dom/ToJSValue.h"

namespace mozilla {

class JavascriptTimelineMarker : public TimelineMarker {
 public:
  // The caller owns |aAsyncCause| here, so we must copy it into a separate
  // string for use later on.
  JavascriptTimelineMarker(const char* aReason, const nsAString& aFunctionName,
                           const nsAString& aFileName, uint32_t aLineNumber,
                           MarkerTracingType aTracingType,
                           JS::Handle<JS::Value> aAsyncStack,
                           const char* aAsyncCause)
      : TimelineMarker("Javascript", aTracingType,
                       MarkerStackRequest::NO_STACK),
        mCause(NS_ConvertUTF8toUTF16(aReason)),
        mFunctionName(aFunctionName),
        mFileName(aFileName),
        mLineNumber(aLineNumber),
        mAsyncCause(aAsyncCause) {
    JSContext* ctx = nsContentUtils::GetCurrentJSContext();
    if (ctx) {
      mAsyncStack.init(ctx, aAsyncStack);
    }
  }

  virtual void AddDetails(JSContext* aCx,
                          dom::ProfileTimelineMarker& aMarker) override {
    TimelineMarker::AddDetails(aCx, aMarker);

    aMarker.mCauseName.Construct(mCause);

    if (!mFunctionName.IsEmpty() || !mFileName.IsEmpty()) {
      dom::RootedDictionary<dom::ProfileTimelineStackFrame> stackFrame(aCx);
      stackFrame.mLine.Construct(mLineNumber);
      stackFrame.mSource.Construct(mFileName);
      stackFrame.mFunctionDisplayName.Construct(mFunctionName);

      if (mAsyncStack.isObject() && !mAsyncCause.IsEmpty()) {
        JS::Rooted<JSObject*> asyncStack(aCx, &mAsyncStack.toObject());
        JS::Rooted<JSObject*> parentFrame(aCx);
        JS::Rooted<JSString*> asyncCause(
            aCx, JS_NewUCStringCopyN(aCx, mAsyncCause.BeginReading(),
                                     mAsyncCause.Length()));
        if (!asyncCause) {
          JS_ClearPendingException(aCx);
          return;
        }

        if (JS::IsMaybeWrappedSavedFrame(asyncStack) &&
            !JS::CopyAsyncStack(aCx, asyncStack, asyncCause, &parentFrame,
                                mozilla::Nothing())) {
          JS_ClearPendingException(aCx);
        } else {
          stackFrame.mAsyncParent = parentFrame;
        }
      }

      JS::Rooted<JS::Value> newStack(aCx);
      if (ToJSValue(aCx, stackFrame, &newStack)) {
        if (newStack.isObject()) {
          aMarker.mStack = &newStack.toObject();
        }
      } else {
        JS_ClearPendingException(aCx);
      }
    }
  }

 private:
  nsString mCause;
  nsString mFunctionName;
  nsString mFileName;
  uint32_t mLineNumber;
  JS::PersistentRooted<JS::Value> mAsyncStack;
  NS_ConvertUTF8toUTF16 mAsyncCause;
};

}  // namespace mozilla

#endif  // mozilla_JavascriptTimelineMarker_h_