hotspot/src/share/vm/gc_implementation/g1/g1BiasedArray.cpp
author jwilhelm
Thu, 03 Oct 2013 21:36:29 +0200
changeset 20398 b206c580c45f
parent 20083 df032615dd00
child 23458 947a3d680f3e
permissions -rw-r--r--
8025852: Remove unnecessary setters in collector policy classes Summary: Use instance variables directly within the collector policy classes and remove unused setters. Reviewed-by: tschatzl, jcoomes
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/*
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc_implementation/g1/g1BiasedArray.hpp"
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#ifndef PRODUCT
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void G1BiasedMappedArrayBase::verify_index(idx_t index) const {
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  guarantee(_base != NULL, "Array not initialized");
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  guarantee(index < length(), err_msg("Index out of bounds index: "SIZE_FORMAT" length: "SIZE_FORMAT, index, length()));
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}
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void G1BiasedMappedArrayBase::verify_biased_index(idx_t biased_index) const {
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  guarantee(_biased_base != NULL, "Array not initialized");
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  guarantee(biased_index >= bias() && biased_index < (bias() + length()),
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    err_msg("Biased index out of bounds, index: "SIZE_FORMAT" bias: "SIZE_FORMAT" length: "SIZE_FORMAT, biased_index, bias(), length()));
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}
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void G1BiasedMappedArrayBase::verify_biased_index_inclusive_end(idx_t biased_index) const {
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  guarantee(_biased_base != NULL, "Array not initialized");
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  guarantee(biased_index >= bias() && biased_index <= (bias() + length()),
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    err_msg("Biased index out of inclusive bounds, index: "SIZE_FORMAT" bias: "SIZE_FORMAT" length: "SIZE_FORMAT, biased_index, bias(), length()));
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}
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class TestMappedArray : public G1BiasedMappedArray<int> {
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protected:
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  virtual int default_value() const { return 0xBAADBABE; }
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public:
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  static void test_biasedarray() {
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    const size_t REGION_SIZE_IN_WORDS = 512;
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    const size_t NUM_REGIONS = 20;
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    HeapWord* fake_heap = (HeapWord*)LP64_ONLY(0xBAAA00000) NOT_LP64(0xBA000000); // Any value that is non-zero
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    TestMappedArray array;
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    array.initialize(fake_heap, fake_heap + REGION_SIZE_IN_WORDS * NUM_REGIONS,
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            REGION_SIZE_IN_WORDS * HeapWordSize);
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    // Check address calculation (bounds)
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    assert(array.bottom_address_mapped() == fake_heap,
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      err_msg("bottom mapped address should be "PTR_FORMAT", but is "PTR_FORMAT, fake_heap, array.bottom_address_mapped()));
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    assert(array.end_address_mapped() == (fake_heap + REGION_SIZE_IN_WORDS * NUM_REGIONS), "must be");
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    int* bottom = array.address_mapped_to(fake_heap);
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    assert((void*)bottom == (void*) array.base(), "must be");
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    int* end = array.address_mapped_to(fake_heap + REGION_SIZE_IN_WORDS * NUM_REGIONS);
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    assert((void*)end == (void*)(array.base() + array.length()), "must be");
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    // The entire array should contain default value elements
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    for (int* current = bottom; current < end; current++) {
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      assert(*current == array.default_value(), "must be");
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    }
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    // Test setting values in the table
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    HeapWord* region_start_address = fake_heap + REGION_SIZE_IN_WORDS * (NUM_REGIONS / 2);
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    HeapWord* region_end_address = fake_heap + (REGION_SIZE_IN_WORDS * (NUM_REGIONS / 2) + REGION_SIZE_IN_WORDS - 1);
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    // Set/get by address tests: invert some value; first retrieve one
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    int actual_value = array.get_by_index(NUM_REGIONS / 2);
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    array.set_by_index(NUM_REGIONS / 2, ~actual_value);
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    // Get the same value by address, should correspond to the start of the "region"
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    int value = array.get_by_address(region_start_address);
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    assert(value == ~actual_value, "must be");
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    // Get the same value by address, at one HeapWord before the start
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    value = array.get_by_address(region_start_address - 1);
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    assert(value == array.default_value(), "must be");
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    // Get the same value by address, at the end of the "region"
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    value = array.get_by_address(region_end_address);
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    assert(value == ~actual_value, "must be");
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    // Make sure the next value maps to another index
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    value = array.get_by_address(region_end_address + 1);
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    assert(value == array.default_value(), "must be");
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    // Reset the value in the array
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    array.set_by_address(region_start_address + (region_end_address - region_start_address) / 2, actual_value);
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    // The entire array should have the default value again
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    for (int* current = bottom; current < end; current++) {
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      assert(*current == array.default_value(), "must be");
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    }
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    // Set/get by index tests: invert some value
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    idx_t index = NUM_REGIONS / 2;
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    actual_value = array.get_by_index(index);
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    array.set_by_index(index, ~actual_value);
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    value = array.get_by_index(index);
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    assert(value == ~actual_value, "must be");
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    value = array.get_by_index(index - 1);
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    assert(value == array.default_value(), "must be");
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    value = array.get_by_index(index + 1);
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    assert(value == array.default_value(), "must be");
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    array.set_by_index(0, 0);
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    value = array.get_by_index(0);
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    assert(value == 0, "must be");
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    array.set_by_index(array.length() - 1, 0);
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    value = array.get_by_index(array.length() - 1);
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    assert(value == 0, "must be");
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    array.set_by_index(index, 0);
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    // The array should have three zeros, and default values otherwise
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    size_t num_zeros = 0;
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    for (int* current = bottom; current < end; current++) {
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      assert(*current == array.default_value() || *current == 0, "must be");
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      if (*current == 0) {
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        num_zeros++;
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      }
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    }
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    assert(num_zeros == 3, "must be");
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  }
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};
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void TestG1BiasedArray_test() {
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  TestMappedArray::test_biasedarray();
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}
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#endif