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Java example source code file (regalloc.hpp)

This example Java source code file (regalloc.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.

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Java - Java tags/keywords

control, convert, exceeded, mapping, matcher, node, optoreg::name, optoregpair, past, phasecfg, phaseregalloc, product, share_vm_opto_regalloc_hpp, vectorset

The regalloc.hpp Java example source code

/*
 * Copyright (c) 2000, 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_REGALLOC_HPP
#define SHARE_VM_OPTO_REGALLOC_HPP

#include "code/vmreg.hpp"
#include "opto/block.hpp"
#include "opto/matcher.hpp"
#include "opto/phase.hpp"

class Node;
class Matcher;
class PhaseCFG;

#define  MAX_REG_ALLOCATORS   10

//------------------------------PhaseRegAlloc------------------------------------
// Abstract register allocator
class PhaseRegAlloc : public Phase {
  friend class VMStructs;
  static void (*_alloc_statistics[MAX_REG_ALLOCATORS])();
  static int _num_allocators;

protected:
  OptoRegPair  *_node_regs;
  uint         _node_regs_max_index;
  VectorSet    _node_oops;         // Mapping from node indices to oopiness

  void alloc_node_regs(int size);  // allocate _node_regs table with at least "size" elements

  PhaseRegAlloc( uint unique, PhaseCFG &cfg, Matcher &matcher,
                 void (*pr_stats)());
public:
  PhaseCFG &_cfg;               // Control flow graph
  uint _framesize;              // Size of frame in stack-slots. not counting preserve area
  OptoReg::Name _max_reg;       // Past largest register seen
  Matcher &_matcher;            // Convert Ideal to MachNodes
  uint node_regs_max_index() const { return _node_regs_max_index; }

  // Get the register associated with the Node
  OptoReg::Name get_reg_first( const Node *n ) const {
    debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); );
    assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
    return _node_regs[n->_idx].first();
  }
  OptoReg::Name get_reg_second( const Node *n ) const {
    debug_only( if( n->_idx >= _node_regs_max_index ) n->dump(); );
    assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
    return _node_regs[n->_idx].second();
  }

  // Do all the real work of allocate
  virtual void Register_Allocate() = 0;


  // notify the register allocator that "node" is a new reference
  // to the value produced by "old_node"
  virtual void add_reference( const Node *node, const Node *old_node) = 0;


  // Set the register associated with a new Node
  void set_bad( uint idx ) {
    assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
    _node_regs[idx].set_bad();
  }
  void set1( uint idx, OptoReg::Name reg ) {
    assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
    _node_regs[idx].set1(reg);
  }
  void set2( uint idx, OptoReg::Name reg ) {
    assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
    _node_regs[idx].set2(reg);
  }
  void set_pair( uint idx, OptoReg::Name hi, OptoReg::Name lo ) {
    assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
    _node_regs[idx].set_pair(hi, lo);
  }
  void set_ptr( uint idx, OptoReg::Name reg ) {
    assert( idx < _node_regs_max_index, "Exceeded _node_regs array");
    _node_regs[idx].set_ptr(reg);
  }
  // Set and query if a node produces an oop
  void set_oop( const Node *n, bool );
  bool is_oop( const Node *n ) const;

  // Convert a register number to a stack offset
  int reg2offset          ( OptoReg::Name reg ) const;
  int reg2offset_unchecked( OptoReg::Name reg ) const;

  // Convert a stack offset to a register number
  OptoReg::Name offset2reg( int stk_offset ) const;

  // Get the register encoding associated with the Node
  int get_encode(const Node *n) const {
    assert( n->_idx < _node_regs_max_index, "Exceeded _node_regs array");
    OptoReg::Name first = _node_regs[n->_idx].first();
    OptoReg::Name second = _node_regs[n->_idx].second();
    assert( !OptoReg::is_valid(second) || second == first+1, "" );
    assert(OptoReg::is_reg(first), "out of range");
    return Matcher::_regEncode[first];
  }

#ifndef PRODUCT
  static int _total_framesize;
  static int _max_framesize;

  virtual void dump_frame() const = 0;
  virtual char *dump_register( const Node *n, char *buf  ) const = 0;
  static void print_statistics();
#endif
};

#endif // SHARE_VM_OPTO_REGALLOC_HPP

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