DoesntCrossCompartmentBoundaries.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */

/* 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/. */

// Test that heap snapshots walk the compartment boundaries correctly.

#include "DevTools.h"

DEF_TEST(DoesntCrossCompartmentBoundaries, {

  // Create a new global to get a new compartment.

  JS::RealmOptions options;

  // dummy

  options.behaviors().setReduceTimerPrecisionCallerType(

      JS::RTPCallerTypeToken{0});

  JS::Rooted<JSObject*> newGlobal(

      cx, JS_NewGlobalObject(cx, getGlobalClass(), nullptr,

                             JS::FireOnNewGlobalHook, options));

  ASSERT_TRUE(newGlobal);

  JS::Compartment* newCompartment = nullptr;

    JSAutoRealm ar(cx, newGlobal);

    ASSERT_TRUE(JS::InitRealmStandardClasses(cx));

    newCompartment = js::GetContextCompartment(cx);

  ASSERT_TRUE(newCompartment);

  ASSERT_NE(newCompartment, compartment);

  // Our set of target compartments is only the pre-existing compartment and

  // does not include the new compartment.

  JS::CompartmentSet targetCompartments;

  ASSERT_TRUE(targetCompartments.put(compartment));

  FakeNode nodeA;

  FakeNode nodeB;

  FakeNode nodeC;

  nodeA.compartment = compartment;

  nodeB.compartment = nullptr;

  nodeC.compartment = newCompartment;

  AddEdge(nodeA, nodeB);

  AddEdge(nodeB, nodeC);

  ::testing::NiceMock<MockWriter> writer;

  // Should serialize nodeA, because it is in our target compartments.

  ExpectWriteNode(writer, nodeA);

  // Should serialize nodeB, because it doesn't belong to a compartment and is

  // therefore assumed to be shared.

  ExpectWriteNode(writer, nodeB);

  // But we shouldn't ever serialize nodeC.

  JS::AutoCheckCannotGC noGC(cx);

  ASSERT_TRUE(WriteHeapGraph(cx, JS::ubi::Node(&nodeA), writer,

                             /* wantNames = */ false, &targetCompartments,

                             noGC));

});