1 /*
   2  * Copyright (c) 2013, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.javac.comp;
  27 
  28 import java.util.HashMap;
  29 
  30 import com.sun.tools.javac.util.Context;
  31 
  32 /** Partial map to record which compiler phases have been executed
  33  *  for each compilation unit. Used for ATTR and FLOW phases.
  34  *
  35  *  <p><b>This is NOT part of any supported API.
  36  *  If you write code that depends on this, you do so at your own risk.
  37  *  This code and its internal interfaces are subject to change or
  38  *  deletion without notice.</b>
  39  */
  40 public class CompileStates extends HashMap<Env<AttrContext>, CompileStates.CompileState> {
  41     /** The context key for the compile states. */
  42     protected static final Context.Key<CompileStates> compileStatesKey = new Context.Key<>();
  43 
  44     /** Get the CompileStates instance for this context. */
  45     public static CompileStates instance(Context context) {
  46         CompileStates instance = context.get(compileStatesKey);
  47         if (instance == null) {
  48             instance = new CompileStates(context);
  49         }
  50         return instance;
  51     }
  52 
  53     /** Ordered list of compiler phases for each compilation unit. */
  54     public enum CompileState {
  55         INIT(0),
  56         PARSE(1),
  57         ENTER(2),
  58         PROCESS(3),
  59         ATTR(4),
  60         FLOW(5),
  61         TRANSTYPES(6),
  62         TRANSPATTERNS(7),
  63         UNLAMBDA(8),
  64         LOWER(9),
  65         GENERATE(10);
  66 
  67         CompileState(int value) {
  68             this.value = value;
  69         }
  70         public boolean isAfter(CompileState other) {
  71             return value > other.value;
  72         }
  73         public static CompileState max(CompileState a, CompileState b) {
  74             return a.value > b.value ? a : b;
  75         }
  76         private final int value;
  77     }
  78 
  79     private static final long serialVersionUID = 1812267524140424433L;
  80 
  81     protected Context context;
  82 
  83     public CompileStates(Context context) {
  84         this.context = context;
  85         context.put(compileStatesKey, this);
  86     }
  87 
  88     public boolean isDone(Env<AttrContext> env, CompileState cs) {
  89         CompileState ecs = get(env);
  90         return (ecs != null) && !cs.isAfter(ecs);
  91     }
  92 }