testPrivateGCThingValue.cpp

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/* -*- 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/. */

#include "mozilla/Utf8.h"  // mozilla::Utf8Unit

#include "jsapi.h"

#include "js/CompilationAndEvaluation.h"  // JS::Compile

#include "js/HeapAPI.h"

#include "js/SourceText.h"  // JS::Source{Ownership,Text}

#include "jsapi-tests/tests.h"

#include "util/Text.h"

class TestTracer final : public JS::CallbackTracer {

  void onChild(JS::GCCellPtr thing, const char* name) override {

    if (thing.asCell() == expectedCell && thing.kind() == expectedKind) {

      found = true;

 public:

  js::gc::Cell* expectedCell;

  JS::TraceKind expectedKind;

  bool found;

  explicit TestTracer(JSContext* cx)

      : JS::CallbackTracer(cx),

        expectedCell(nullptr),

        expectedKind(static_cast<JS::TraceKind>(0)),

        found(false) {}

};

static const JSClass TestClass = {

    "TestClass",

    JSCLASS_HAS_RESERVED_SLOTS(1),

};

BEGIN_TEST(testPrivateGCThingValue) {

  JS::RootedObject obj(cx, JS_NewObject(cx, &TestClass));

  CHECK(obj);

  // Make a JSScript to stick into a PrivateGCThingValue.

  static const char code[] = "'objet petit a'";

  JS::CompileOptions options(cx);

  options.setFileAndLine(__FILE__, __LINE__);

  JS::SourceText<mozilla::Utf8Unit> srcBuf;

  CHECK(srcBuf.init(cx, code, js_strlen(code), JS::SourceOwnership::Borrowed));

  JS::RootedScript script(cx, JS::Compile(cx, options, srcBuf));

  CHECK(script);

  JS_SetReservedSlot(obj, 0, PrivateGCThingValue(script));

  TestTracer trc(cx);

  trc.expectedCell = script;

  trc.expectedKind = JS::TraceKind::Script;

  JS::TraceChildren(&trc, JS::GCCellPtr(obj, JS::TraceKind::Object));

  CHECK(trc.found);

  return true;

END_TEST(testPrivateGCThingValue)