[wasm] Add a Managed<T> wrapper class for allocating C++ classes that are deleted when the wrapper …

test/cctest/wasm/test-managed.cc

+// Copyright 2016 the V8 project 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 <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "src/wasm/managed.h"
+
+#include "test/cctest/cctest.h"
+#include "test/common/wasm/test-signatures.h"
+
+using namespace v8::base;
+using namespace v8::internal;
+
+class DeleteRecorder {
+ public:
+  explicit DeleteRecorder(bool* deleted) : deleted_(deleted) {
+    *deleted_ = false;
+  }
+  ~DeleteRecorder() { *deleted_ = true; }
+
+ private:
+  bool* deleted_;
+};
+
+TEST(ManagedCollect) {
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  bool deleted = false;
+  DeleteRecorder* d = new DeleteRecorder(&deleted);
+
+  {
+    HandleScope scope(isolate);
+    auto handle = Managed<DeleteRecorder>::New(isolate, d);
+    USE(handle);
+  }
+
+  CcTest::CollectAllAvailableGarbage();
+
+  CHECK(deleted);
+}
+
+TEST(ManagedCollectNoDelete) {
+  Isolate* isolate = CcTest::InitIsolateOnce();
+  bool deleted = false;
+  DeleteRecorder* d = new DeleteRecorder(&deleted);
+
+  {
+    HandleScope scope(isolate);
+    auto handle = Managed<DeleteRecorder>::New(isolate, d, false);
+    USE(handle);
+  }
+
+  CcTest::CollectAllAvailableGarbage();
+
+  CHECK(!deleted);
+  delete d;
+}