Retain maps embedded in optimized code for several garbage collections.

test/cctest/test-array-list.cc

+// Copyright 2014 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 <stdlib.h>
+
+#include "src/v8.h"
+
+#include "src/factory.h"
+#include "test/cctest/cctest.h"
+
+namespace {
+
+using namespace v8::internal;
+
+
+TEST(ArrayList) {
+  LocalContext context;
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+  Handle<ArrayList> array(
+      ArrayList::cast(isolate->heap()->empty_fixed_array()));
+  CHECK_EQ(0, array->Length());
+  array = ArrayList::Add(array, handle(Smi::FromInt(100), isolate));
+  CHECK_EQ(1, array->Length());
+  CHECK_EQ(100, Smi::cast(array->Get(0))->value());
+  array = ArrayList::Add(array, handle(Smi::FromInt(200), isolate),
+                         handle(Smi::FromInt(300), isolate));
+  CHECK_EQ(3, array->Length());
+  CHECK_EQ(100, Smi::cast(array->Get(0))->value());
+  CHECK_EQ(200, Smi::cast(array->Get(1))->value());
+  CHECK_EQ(300, Smi::cast(array->Get(2))->value());
+  array->Set(2, Smi::FromInt(400));
+  CHECK_EQ(400, Smi::cast(array->Get(2))->value());
+  array->Clear(2, isolate->heap()->undefined_value());
+  array->SetLength(2);
+  CHECK_EQ(2, array->Length());
+  CHECK_EQ(100, Smi::cast(array->Get(0))->value());
+  CHECK_EQ(200, Smi::cast(array->Get(1))->value());
+}
+}