src/hotspot/share/libadt/vectset.cpp
author redestad
Mon, 18 Nov 2019 16:10:32 +0100
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8234248: More VectorSet cleanups Reviewed-by: neliasso, thartmann
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/*
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 * Copyright (c) 1997, 2019, 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 "libadt/vectset.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/arena.hpp"
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#include "utilities/count_leading_zeros.hpp"
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VectorSet::VectorSet(Arena *arena) : _size(2),
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    _data(NEW_ARENA_ARRAY(arena, uint32_t, 2)),
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    _set_arena(arena) {
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  _data[0] = 0;
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  _data[1] = 0;
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}
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// Expand the existing set to a bigger size
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void VectorSet::grow(uint new_size) {
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  new_size = (new_size + bit_mask) >> word_bits;
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  assert(new_size != 0 && new_size < (1U << 31), "");
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  uint x = (1U << 31) >> (count_leading_zeros(new_size) - 1);
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  _data = REALLOC_ARENA_ARRAY(_set_arena, uint32_t, _data, _size, x);
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  Copy::zero_to_bytes(_data + _size, (x - _size) * sizeof(uint32_t));
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  _size = x;
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}
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// Insert a member into an existing Set.
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void VectorSet::insert(uint elem) {
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  uint32_t word = elem >> word_bits;
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  uint32_t mask = 1U << (elem & bit_mask);
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  if (word >= _size) {
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    grow(elem + 1);
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  }
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  _data[word] |= mask;
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}
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// Resets the storage
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void VectorSet::reset_memory() {
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  assert(_size >= 2, "_size can never be less than 2");
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  _data = REALLOC_ARENA_ARRAY(_set_arena, uint32_t, _data, _size, 2);
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  _size = 2;
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  _data[0] = 0;
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  _data[1] = 0;
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}
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// Return true if the set is empty
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bool VectorSet::is_empty() const {
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  for (uint32_t i = 0; i < _size; i++) {
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    if (_data[i] != 0) {
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      return false;
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    }
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  }
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  return true;
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}