--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/native/gc/g1/test_g1BiasedArray.cpp	Tue Oct 18 19:26:07 2016 +0400
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1BiasedArray.hpp"
+#include "unittest.hpp"
+
+class TestMappedArray : public G1BiasedMappedArray<int> {
+public:
+  virtual int default_value() const {
+    return 0xBAADBABE;
+  }
+  int* my_address_mapped_to(HeapWord* address) {
+    return address_mapped_to(address);
+  }
+};
+
+TEST_VM(G1BiasedArray, simple) {
+  const size_t REGION_SIZE_IN_WORDS = 512;
+  const size_t NUM_REGIONS = 20;
+  // Any value that is non-zero
+  HeapWord* fake_heap =
+          (HeapWord*) LP64_ONLY(0xBAAA00000) NOT_LP64(0xBA000000);
+
+  TestMappedArray array;
+  array.initialize(fake_heap, fake_heap + REGION_SIZE_IN_WORDS * NUM_REGIONS,
+          REGION_SIZE_IN_WORDS * HeapWordSize);
+  const int DEFAULT_VALUE = array.default_value();
+
+  // Check address calculation (bounds)
+  ASSERT_EQ(fake_heap, array.bottom_address_mapped())
+          << "bottom mapped address should be "
+          << p2i(array.bottom_address_mapped())
+          << ", but is "
+          << p2i(fake_heap);
+  ASSERT_EQ(fake_heap + REGION_SIZE_IN_WORDS * NUM_REGIONS,
+          array.end_address_mapped());
+
+  int* bottom = array.my_address_mapped_to(fake_heap);
+  ASSERT_EQ((void*) bottom, (void*) array.base());
+  int* end = array.my_address_mapped_to(fake_heap +
+          REGION_SIZE_IN_WORDS * NUM_REGIONS);
+  ASSERT_EQ((void*) end, (void*) (array.base() + array.length()));
+  // The entire array should contain default value elements
+  for (int* current = bottom; current < end; current++) {
+    ASSERT_EQ(DEFAULT_VALUE, *current);
+  }
+
+  // Test setting values in the table
+  HeapWord* region_start_address =
+          fake_heap + REGION_SIZE_IN_WORDS * (NUM_REGIONS / 2);
+  HeapWord* region_end_address =
+          fake_heap + (REGION_SIZE_IN_WORDS * (NUM_REGIONS / 2) +
+          REGION_SIZE_IN_WORDS - 1);
+
+  // Set/get by address tests: invert some value; first retrieve one
+  int actual_value = array.get_by_index(NUM_REGIONS / 2);
+  array.set_by_index(NUM_REGIONS / 2, ~actual_value);
+  // Get the same value by address, should correspond to the start of the "region"
+  int value = array.get_by_address(region_start_address);
+  ASSERT_EQ(value, ~actual_value);
+  // Get the same value by address, at one HeapWord before the start
+  value = array.get_by_address(region_start_address - 1);
+  ASSERT_EQ(DEFAULT_VALUE, value);
+  // Get the same value by address, at the end of the "region"
+  value = array.get_by_address(region_end_address);
+  ASSERT_EQ(value, ~actual_value);
+  // Make sure the next value maps to another index
+  value = array.get_by_address(region_end_address + 1);
+  ASSERT_EQ(DEFAULT_VALUE, value);
+
+  // Reset the value in the array
+  array.set_by_address(region_start_address +
+          (region_end_address - region_start_address) / 2,
+          actual_value);
+
+  // The entire array should have the default value again
+  for (int* current = bottom; current < end; current++) {
+    ASSERT_EQ(DEFAULT_VALUE, *current);
+  }
+
+  // Set/get by index tests: invert some value
+  size_t index = NUM_REGIONS / 2;
+  actual_value = array.get_by_index(index);
+  array.set_by_index(index, ~actual_value);
+
+  value = array.get_by_index(index);
+  ASSERT_EQ(~actual_value, value);
+
+  value = array.get_by_index(index - 1);
+  ASSERT_EQ(DEFAULT_VALUE, value);
+
+  value = array.get_by_index(index + 1);
+  ASSERT_EQ(DEFAULT_VALUE, value);
+
+  array.set_by_index(0, 0);
+  value = array.get_by_index(0);
+  ASSERT_EQ(0, value);
+
+  array.set_by_index(array.length() - 1, 0);
+  value = array.get_by_index(array.length() - 1);
+  ASSERT_EQ(0, value);
+
+  array.set_by_index(index, 0);
+
+  // The array should have three zeros, and default values otherwise
+  size_t num_zeros = 0;
+  for (int* current = bottom; current < end; current++) {
+    ASSERT_TRUE(*current == DEFAULT_VALUE || *current == 0);
+    if (*current == 0) {
+      num_zeros++;
+    }
+  }
+  ASSERT_EQ((size_t) 3, num_zeros);
+}
+