1 /*
   2  * Copyright (c) 2011, 2019, 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 package org.graalvm.compiler.virtual.phases.ea;
  26 
  27 import static org.graalvm.compiler.core.common.GraalOptions.EscapeAnalyzeOnly;
  28 
  29 import org.graalvm.compiler.nodes.StructuredGraph;
  30 import org.graalvm.compiler.nodes.StructuredGraph.ScheduleResult;
  31 import org.graalvm.compiler.nodes.cfg.ControlFlowGraph;
  32 import org.graalvm.compiler.nodes.spi.CoreProviders;
  33 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  34 
  35 public class EarlyReadEliminationPhase extends EffectsPhase<CoreProviders> {
  36 
  37     private final boolean considerGuards;
  38 
  39     public EarlyReadEliminationPhase(CanonicalizerPhase canonicalizer) {
  40         super(1, canonicalizer, true);
  41         this.considerGuards = true;
  42     }
  43 
  44     public EarlyReadEliminationPhase(CanonicalizerPhase canonicalizer, boolean considerGuards) {
  45         super(1, canonicalizer, true);
  46         this.considerGuards = considerGuards;
  47     }
  48 
  49     @Override
  50     protected void run(StructuredGraph graph, CoreProviders context) {
  51         if (VirtualUtil.matches(graph, EscapeAnalyzeOnly.getValue(graph.getOptions()))) {
  52             runAnalysis(graph, context);
  53         }
  54     }
  55 
  56     @Override
  57     protected Closure<?> createEffectsClosure(CoreProviders context, ScheduleResult schedule, ControlFlowGraph cfg) {
  58         assert schedule == null;
  59         return new ReadEliminationClosure(cfg, considerGuards);
  60     }
  61 
  62     @Override
  63     public float codeSizeIncrease() {
  64         return 2f;
  65     }
  66 }