Java example source code file (live.hpp)

This example Java source code file (live.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arena, basic, block, free, indexset, largest, lrg_list, mapping, nodes, null, phasecfg, phaselive, share_vm_opto_live_hpp, vectorset

The live.hpp Java example source code

/*
 * Copyright (c) 1997, 2013, 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.
 *
 */

#ifndef SHARE_VM_OPTO_LIVE_HPP
#define SHARE_VM_OPTO_LIVE_HPP

#include "libadt/port.hpp"
#include "libadt/vectset.hpp"
#include "opto/block.hpp"
#include "opto/indexSet.hpp"
#include "opto/phase.hpp"
#include "opto/regmask.hpp"

class Block;
class PhaseCFG;
class VectorSet;
class IndexSet;

//------------------------------LRG_List---------------------------------------
// Map Node indices to Live RanGe indices.
// Array lookup in the optimized case.
typedef GrowableArray<uint> LRG_List;

//------------------------------PhaseLive--------------------------------------
// Compute live-in/live-out
class PhaseLive : public Phase {
  // Array of Sets of values live at the start of a block.
  // Indexed by block pre-order number.
  IndexSet *_live;

  // Array of Sets of values defined locally in the block
  // Indexed by block pre-order number.
  IndexSet *_defs;

  // Array of delta-set pointers, indexed by block pre-order number
  IndexSet **_deltas;
  IndexSet *_free_IndexSet;     // Free list of same

  Block_List *_worklist;        // Worklist for iterative solution

  const PhaseCFG &_cfg;         // Basic blocks
  const LRG_List &_names;       // Mapping from Nodes to live ranges
  uint _maxlrg;                 // Largest live-range number
  Arena *_arena;

  IndexSet *getset( Block *p );
  IndexSet *getfreeset( );
  void freeset( const Block *p );
  void add_liveout( Block *p, uint r, VectorSet &first_pass );
  void add_liveout( Block *p, IndexSet *lo, VectorSet &first_pass );

public:
  PhaseLive(const PhaseCFG &cfg, const LRG_List &names, Arena *arena);
  ~PhaseLive() {}
  // Compute liveness info
  void compute(uint maxlrg);
  // Reset arena storage
  void reset() { _live = NULL; }

  // Return the live-out set for this block
  IndexSet *live( const Block * b ) { return &_live[b->_pre_order-1]; }

#ifndef PRODUCT
  void dump( const Block *b ) const;
  void stats(uint iters) const;
#endif
};

#endif // SHARE_VM_OPTO_LIVE_HPP