Made zone segments aligned in memory and included a pointer to the zone in the header. Larger objec…

test/unittests/zone-unittest.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 <stdlib.h>
+#include <cmath>
+#include <limits>
+
+#include "src/base/platform/platform.h"
+#include "src/base/utils/random-number-generator.h"
+#include "src/handles-inl.h"
+#include "src/objects-inl.h"
+#include "src/zone.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace internal {
+
+void generate_data(byte* data, const uint32_t length) {
+  for (uint32_t i = 0; i < length; i++) {
+    data[i] = (i % 100) & 0xFF;
+  }
+}
+
+bool validate_data(const byte* data, const uint32_t length) {
+  for (uint32_t i = 0; i < length; i++) {
+    if (data[i] != ((i % 100) & 0xFF)) return false;
+  }
+  return true;
+}
+
+TEST(Zone, EmptyAlloc) {
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+
+  CHECK_EQ(zone.allocation_size(), 0);
+
+  void* ptr = zone.New(0);
+
+  CHECK_EQ(zone.allocation_size(), 0);
+  CHECK_EQ(Zone::GetZoneFromPointer(ptr), &zone);
+}
+
+TEST(Zone, SimpleAlloc) {
+  const size_t kNumberOfChunks = 10000;
+  const size_t kMaxChunkSize = 1000;
+
+  base::RandomNumberGenerator rnd(::v8::internal::FLAG_random_seed);
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+
+  CHECK_EQ(zone.allocation_size(), 0);
+
+  byte* chunks[kNumberOfChunks];
+  uint16_t sizes[kNumberOfChunks];
+
+  for (int i = 0; i < kNumberOfChunks; i++) {
+    sizes[i] = 1 + (rnd.NextInt() % kMaxChunkSize);
+    chunks[i] = reinterpret_cast<byte*>(zone.New(sizes[i]));
+
+    generate_data(chunks[i], sizes[i]);
+  }
+
+  CHECK_GE(zone.allocation_size(), kNumberOfChunks);
+
+  for (int i = 0; i < kNumberOfChunks; i++) {
+    CHECK(validate_data(chunks[i], sizes[i]));
+  }
+}
+
+TEST(Zone, LargeAlloc) {
+  const size_t kNumberOfChunks = 50;
+  const size_t kMaxChunkSize = 5000000;
+
+  base::RandomNumberGenerator rnd(::v8::internal::FLAG_random_seed);
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+
+  CHECK_EQ(zone.allocation_size(), 0);
+
+  byte* chunks[kNumberOfChunks];
+  uint32_t sizes[kNumberOfChunks];
+
+  for (int i = 0; i < kNumberOfChunks; i++) {
+    sizes[i] = 1 + (rnd.NextInt() % kMaxChunkSize);
+    chunks[i] = reinterpret_cast<byte*>(zone.New(sizes[i]));
+
+    generate_data(chunks[i], sizes[i]);
+  }
+
+  CHECK_GE(zone.allocation_size(), kNumberOfChunks);
+
+  for (int i = 0; i < kNumberOfChunks; i++) {
+    CHECK(validate_data(chunks[i], sizes[i]));
+  }
+}
+
+TEST(Zone, ZoneRealloc) {
+  const size_t kDataAmount = 5000000;
+
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
+
+  CHECK_EQ(zone.allocation_size(), 0);
+
+  ZoneList<byte>* list = new (&zone) ZoneList<byte>(0, &zone);
+
+  for (uint32_t i = 0; i < kDataAmount; i++) {
+    list->Add(i % 100, &zone);
+  }
+
+  CHECK_EQ(static_cast<size_t>(list->length()), kDataAmount);
+  CHECK_GE(static_cast<size_t>(list->capacity()), kDataAmount);
+  CHECK_GE(zone.allocation_size(), kDataAmount);
+
+  for (uint32_t i = 0; i < kDataAmount; i++) {
+    CHECK_EQ((*list)[i], i % 100);
+  }
+}
+
+}  // namespace internal
+}  // namespace v8