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Java example source code file (output.hpp)

This example Java source code file (output.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, block, bundle, choosenodetobundle, debug_arg, node, node_list, optoreg\:\:name, phasecfg, pipeline_use, pipeline_use_element, product, scheduling, share_vm_opto_output_hpp

The output.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_OUTPUT_HPP
#define SHARE_VM_OPTO_OUTPUT_HPP

#include "opto/block.hpp"
#include "opto/node.hpp"
#ifdef TARGET_ARCH_MODEL_x86_32
# include "adfiles/ad_x86_32.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_x86_64
# include "adfiles/ad_x86_64.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_sparc
# include "adfiles/ad_sparc.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_zero
# include "adfiles/ad_zero.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_arm
# include "adfiles/ad_arm.hpp"
#endif
#ifdef TARGET_ARCH_MODEL_ppc
# include "adfiles/ad_ppc.hpp"
#endif

class Arena;
class Bundle;
class Block;
class Block_Array;
class Node;
class Node_Array;
class Node_List;
class PhaseCFG;
class PhaseChaitin;
class Pipeline_Use_Element;
class Pipeline_Use;

#ifndef PRODUCT
#define DEBUG_ARG(x) , x
#else
#define DEBUG_ARG(x)
#endif

// Define the initial sizes for allocation of the resizable code buffer
enum {
  initial_code_capacity  =  16 * 1024,
  initial_stub_capacity  =   4 * 1024,
  initial_const_capacity =   4 * 1024,
  initial_locs_capacity  =   3 * 1024
};

//------------------------------Scheduling----------------------------------
// This class contains all the information necessary to implement instruction
// scheduling and bundling.
class Scheduling {

private:
  // Arena to use
  Arena *_arena;

  // Control-Flow Graph info
  PhaseCFG *_cfg;

  // Register Allocation info
  PhaseRegAlloc *_regalloc;

  // Number of nodes in the method
  uint _node_bundling_limit;

  // List of scheduled nodes. Generated in reverse order
  Node_List _scheduled;

  // List of nodes currently available for choosing for scheduling
  Node_List _available;

  // For each instruction beginning a bundle, the number of following
  // nodes to be bundled with it.
  Bundle *_node_bundling_base;

  // Mapping from register to Node
  Node_List _reg_node;

  // Free list for pinch nodes.
  Node_List _pinch_free_list;

  // Latency from the beginning of the containing basic block (base 1)
  // for each node.
  unsigned short *_node_latency;

  // Number of uses of this node within the containing basic block.
  short *_uses;

  // Schedulable portion of current block.  Skips Region/Phi/CreateEx up
  // front, branch+proj at end.  Also skips Catch/CProj (same as
  // branch-at-end), plus just-prior exception-throwing call.
  uint _bb_start, _bb_end;

  // Latency from the end of the basic block as scheduled
  unsigned short *_current_latency;

  // Remember the next node
  Node *_next_node;

  // Use this for an unconditional branch delay slot
  Node *_unconditional_delay_slot;

  // Pointer to a Nop
  MachNopNode *_nop;

  // Length of the current bundle, in instructions
  uint _bundle_instr_count;

  // Current Cycle number, for computing latencies and bundling
  uint _bundle_cycle_number;

  // Bundle information
  Pipeline_Use_Element _bundle_use_elements[resource_count];
  Pipeline_Use         _bundle_use;

  // Dump the available list
  void dump_available() const;

public:
  Scheduling(Arena *arena, Compile &compile);

  // Destructor
  NOT_PRODUCT( ~Scheduling(); )

  // Step ahead "i" cycles
  void step(uint i);

  // Step ahead 1 cycle, and clear the bundle state (for example,
  // at a branch target)
  void step_and_clear();

  Bundle* node_bundling(const Node *n) {
    assert(valid_bundle_info(n), "oob");
    return (&_node_bundling_base[n->_idx]);
  }

  bool valid_bundle_info(const Node *n) const {
    return (_node_bundling_limit > n->_idx);
  }

  bool starts_bundle(const Node *n) const {
    return (_node_bundling_limit > n->_idx && _node_bundling_base[n->_idx].starts_bundle());
  }

  // Do the scheduling
  void DoScheduling();

  // Compute the local latencies walking forward over the list of
  // nodes for a basic block
  void ComputeLocalLatenciesForward(const Block *bb);

  // Compute the register antidependencies within a basic block
  void ComputeRegisterAntidependencies(Block *bb);
  void verify_do_def( Node *n, OptoReg::Name def, const char *msg );
  void verify_good_schedule( Block *b, const char *msg );
  void anti_do_def( Block *b, Node *def, OptoReg::Name def_reg, int is_def );
  void anti_do_use( Block *b, Node *use, OptoReg::Name use_reg );

  // Add a node to the current bundle
  void AddNodeToBundle(Node *n, const Block *bb);

  // Add a node to the list of available nodes
  void AddNodeToAvailableList(Node *n);

  // Compute the local use count for the nodes in a block, and compute
  // the list of instructions with no uses in the block as available
  void ComputeUseCount(const Block *bb);

  // Choose an instruction from the available list to add to the bundle
  Node * ChooseNodeToBundle();

  // See if this Node fits into the currently accumulating bundle
  bool NodeFitsInBundle(Node *n);

  // Decrement the use count for a node
 void DecrementUseCounts(Node *n, const Block *bb);

  // Garbage collect pinch nodes for reuse by other blocks.
  void garbage_collect_pinch_nodes();
  // Clean up a pinch node for reuse (helper for above).
  void cleanup_pinch( Node *pinch );

  // Information for statistics gathering
#ifndef PRODUCT
private:
  // Gather information on size of nops relative to total
  uint _branches, _unconditional_delays;

  static uint _total_nop_size, _total_method_size;
  static uint _total_branches, _total_unconditional_delays;
  static uint _total_instructions_per_bundle[Pipeline::_max_instrs_per_cycle+1];

public:
  static void print_statistics();

  static void increment_instructions_per_bundle(uint i) {
    _total_instructions_per_bundle[i]++;
  }

  static void increment_nop_size(uint s) {
    _total_nop_size += s;
  }

  static void increment_method_size(uint s) {
    _total_method_size += s;
  }
#endif

};

#endif // SHARE_VM_OPTO_OUTPUT_HPP

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