src/hotspot/share/libadt/vectset.cpp
author redestad
Thu, 07 Nov 2019 12:12:39 +0100
changeset 58962 2dcfc28a314d
parent 53546 63eb7e38ce84
child 59121 7cbffba2156b
permissions -rw-r--r--
8233708: VectorSet cleanup Reviewed-by: neliasso, shade, 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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VectorSet::VectorSet(Arena *arena) {
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  _set_arena = arena;
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  size = 2;                     // Small initial size
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  data = (uint32_t *)_set_arena->Amalloc(size*sizeof(uint32_t));
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  data[0] = 0;                  // No elements
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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 newsize) {
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  newsize = (newsize+31) >> 5;
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  uint x = size;
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  while (x < newsize) {
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    x <<= 1;
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  }
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  data = (uint32_t *)_set_arena->Arealloc(data, size*sizeof(uint32_t), x*sizeof(uint32_t));
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  memset((char*)(data + size), 0, (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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  uint word = elem >> 5;
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  uint32_t mask = 1L << (elem & 31);
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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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// Clear a set
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void VectorSet::clear() {
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  if( size > 100 ) {            // Reclaim storage only if huge
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    FREE_RESOURCE_ARRAY(uint32_t,data,size);
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    size = 2;                   // Small initial size
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    data = NEW_RESOURCE_ARRAY(uint32_t,size);
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  }
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  memset(data, 0, size*sizeof(uint32_t));
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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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}
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int VectorSet::hash() const {
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  uint32_t _xor = 0;
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  uint lim = ((size < 4) ? size : 4);
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  for (uint i = 0; i < lim; i++) {
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    _xor ^= data[i];
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  }
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  return (int)_xor;
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}