/*

 * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

class Compile;

//------------------------------Phase------------------------------------------

// Most optimizations are done in Phases.  Creating a phase does any long

// running analysis required, and caches the analysis in internal data

// structures.  Later the analysis is queried using transform() calls to

// guide transforming the program.  When the Phase is deleted, so is any

// cached analysis info.  This basic Phase class mostly contains timing and

// memory management code.

class Phase : public StackObj {

public:

  enum PhaseNumber {

    Compiler,                   // Top-level compiler phase

    Parser,                     // Parse bytecodes

    Remove_Useless,             // Remove useless nodes

    Optimistic,                 // Optimistic analysis phase

    GVN,                        // Pessimistic global value numbering phase

    Ins_Select,                 // Instruction selection phase

    CFG,                        // Build a CFG

    BlockLayout,                // Linear ordering of blocks

    Register_Allocation,        // Register allocation, duh

    LIVE,                       // Dragon-book LIVE range problem

    StringOpts,                 // StringBuilder related optimizations

    Interference_Graph,         // Building the IFG

    Coalesce,                   // Coalescing copies

    Ideal_Loop,                 // Find idealized trip-counted loops

    Macro_Expand,               // Expand macro nodes

    Peephole,                   // Apply peephole optimizations

    last_phase

  };

protected:

  enum PhaseNumber _pnum;       // Phase number (for stat gathering)

#ifndef PRODUCT

  static int _total_bytes_compiled;

  // accumulated timers

  static elapsedTimer _t_totalCompilation;

  static elapsedTimer _t_methodCompilation;

  static elapsedTimer _t_stubCompilation;

#endif

// The next timers used for LogCompilation

  static elapsedTimer _t_parser;

  static elapsedTimer _t_escapeAnalysis;

  static elapsedTimer _t_optimizer;

  static elapsedTimer   _t_idealLoop;

  static elapsedTimer   _t_ccp;

  static elapsedTimer _t_matcher;

  static elapsedTimer _t_registerAllocation;

  static elapsedTimer _t_output;

#ifndef PRODUCT

  static elapsedTimer _t_graphReshaping;

  static elapsedTimer _t_scheduler;

  static elapsedTimer _t_blockOrdering;

  static elapsedTimer _t_macroExpand;

  static elapsedTimer _t_peephole;

  static elapsedTimer _t_codeGeneration;

  static elapsedTimer _t_registerMethod;

  static elapsedTimer _t_temporaryTimer1;

  static elapsedTimer _t_temporaryTimer2;

  static elapsedTimer _t_idealLoopVerify;

// Subtimers for _t_optimizer

  static elapsedTimer   _t_iterGVN;

  static elapsedTimer   _t_iterGVN2;

// Subtimers for _t_registerAllocation

  static elapsedTimer   _t_ctorChaitin;

  static elapsedTimer   _t_buildIFGphysical;

  static elapsedTimer   _t_computeLive;

  static elapsedTimer   _t_regAllocSplit;

  static elapsedTimer   _t_postAllocCopyRemoval;

  static elapsedTimer   _t_fixupSpills;

// Subtimers for _t_output

  static elapsedTimer   _t_instrSched;

  static elapsedTimer   _t_buildOopMaps;

#endif

public:

  Compile * C;

  Phase( PhaseNumber pnum );

#ifndef PRODUCT

  static void print_timers();

#endif

};