Constrain the zone segment pool size

test/unittests/zone/segmentpool-tests.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 "src/zone/accounting-allocator.h"

[jochen (gone - plz use gerrit), 2016/10/20 10:29:34]

empty line above this one

+#include "testing/gtest/include/gtest/gtest.h"
+namespace v8 {

[jochen (gone - plz use gerrit), 2016/10/20 10:29:34]

empty line above this one

+namespace internal {
+
+class SegmentPoolTests {
+ public:
+  static void test_pool_size_constraints() {
+    size_t sizes[]{
+        0,  // Corner case
+        AccountingAllocator::kMaxPoolSizeLowMemoryDevice,
+        AccountingAllocator::kMaxPoolSizeMediumMemoryDevice,
+        AccountingAllocator::kMaxPoolSizeHighMemoryDevice,
+        AccountingAllocator::kMaxPoolSizeHugeMemoryDevice,
+        GB  // Something really large
+    };
+
+    AccountingAllocator allocator;
+    for (size_t size : sizes) {
+      allocator.ConfigureSegmentPool(size);
+      size_t total_size = 0;
+      for (size_t power = 0; power < AccountingAllocator::kNumberBuckets;
+           ++power) {
+        total_size +=
+            allocator.unused_segments_max_sizes_[power] * (size_t(1) << power);
+      }
+      CHECK_LE(total_size, size);

[jochen (gone - plz use gerrit), 2016/10/20 10:29:34]

use EXPECT_LE - there's no reason to crash

+    }
+  }
+};
+
+TEST(Zone, SegmentPoolConstraints) {
+  SegmentPoolTests::test_pool_size_constraints();

[jochen (gone - plz use gerrit), 2016/10/20 10:29:34]

just inline the entire static method here

+}
+
+}  // namespace internal
+}  // namespace v8