1 /*
   2  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 class Compile;
  26 
  27 //------------------------------Phase------------------------------------------
  28 // Most optimizations are done in Phases.  Creating a phase does any long
  29 // running analysis required, and caches the analysis in internal data
  30 // structures.  Later the analysis is queried using transform() calls to
  31 // guide transforming the program.  When the Phase is deleted, so is any
  32 // cached analysis info.  This basic Phase class mostly contains timing and
  33 // memory management code.
  34 class Phase : public StackObj {
  35 public:
  36   enum PhaseNumber {
  37     Compiler,                   // Top-level compiler phase
  38     Parser,                     // Parse bytecodes
  39     Remove_Useless,             // Remove useless nodes
  40     Optimistic,                 // Optimistic analysis phase
  41     GVN,                        // Pessimistic global value numbering phase
  42     Ins_Select,                 // Instruction selection phase
  43     CFG,                        // Build a CFG
  44     BlockLayout,                // Linear ordering of blocks
  45     Register_Allocation,        // Register allocation, duh
  46     LIVE,                       // Dragon-book LIVE range problem
  47     StringOpts,                 // StringBuilder related optimizations
  48     Interference_Graph,         // Building the IFG
  49     Coalesce,                   // Coalescing copies
  50     Ideal_Loop,                 // Find idealized trip-counted loops
  51     Macro_Expand,               // Expand macro nodes
  52     Peephole,                   // Apply peephole optimizations
  53     last_phase
  54   };
  55 protected:
  56   enum PhaseNumber _pnum;       // Phase number (for stat gathering)
  57 
  58 #ifndef PRODUCT
  59   static int _total_bytes_compiled;
  60 
  61   // accumulated timers
  62   static elapsedTimer _t_totalCompilation;
  63   static elapsedTimer _t_methodCompilation;
  64   static elapsedTimer _t_stubCompilation;
  65 #endif
  66 
  67 // The next timers used for LogCompilation
  68   static elapsedTimer _t_parser;
  69   static elapsedTimer _t_escapeAnalysis;
  70   static elapsedTimer _t_optimizer;
  71   static elapsedTimer   _t_idealLoop;
  72   static elapsedTimer   _t_ccp;
  73   static elapsedTimer _t_matcher;
  74   static elapsedTimer _t_registerAllocation;
  75   static elapsedTimer _t_output;
  76 
  77 #ifndef PRODUCT
  78   static elapsedTimer _t_graphReshaping;
  79   static elapsedTimer _t_scheduler;
  80   static elapsedTimer _t_blockOrdering;
  81   static elapsedTimer _t_macroExpand;
  82   static elapsedTimer _t_peephole;
  83   static elapsedTimer _t_codeGeneration;
  84   static elapsedTimer _t_registerMethod;
  85   static elapsedTimer _t_temporaryTimer1;
  86   static elapsedTimer _t_temporaryTimer2;
  87   static elapsedTimer _t_idealLoopVerify;
  88 
  89 // Subtimers for _t_optimizer
  90   static elapsedTimer   _t_iterGVN;
  91   static elapsedTimer   _t_iterGVN2;
  92 
  93 // Subtimers for _t_registerAllocation
  94   static elapsedTimer   _t_ctorChaitin;
  95   static elapsedTimer   _t_buildIFGphysical;
  96   static elapsedTimer   _t_computeLive;
  97   static elapsedTimer   _t_regAllocSplit;
  98   static elapsedTimer   _t_postAllocCopyRemoval;
  99   static elapsedTimer   _t_fixupSpills;
 100 
 101 // Subtimers for _t_output
 102   static elapsedTimer   _t_instrSched;
 103   static elapsedTimer   _t_buildOopMaps;
 104 #endif
 105 public:
 106   Compile * C;
 107   Phase( PhaseNumber pnum );
 108 #ifndef PRODUCT
 109   static void print_timers();
 110 #endif
 111 };