1 /*
   2  * Copyright (c) 2012, 2018, 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.loop.phases;
  26 
  27 import org.graalvm.compiler.debug.DebugContext;
  28 import org.graalvm.compiler.loop.LoopEx;
  29 import org.graalvm.compiler.loop.LoopPolicies;
  30 import org.graalvm.compiler.loop.LoopsData;
  31 import org.graalvm.compiler.nodes.StructuredGraph;
  32 import org.graalvm.compiler.nodes.spi.CoreProviders;
  33 
  34 public class LoopPeelingPhase extends LoopPhase<LoopPolicies> {
  35 
  36     public LoopPeelingPhase(LoopPolicies policies) {
  37         super(policies);
  38     }
  39 
  40     @Override
  41     @SuppressWarnings("try")
  42     protected void run(StructuredGraph graph, CoreProviders context) {
  43         DebugContext debug = graph.getDebug();
  44         if (graph.hasLoops()) {
  45             LoopsData data = new LoopsData(graph);
  46             try (DebugContext.Scope s = debug.scope("peeling", data.getCFG())) {
  47                 for (LoopEx loop : data.outerFirst()) {
  48                     if (getPolicies().shouldPeel(loop, data.getCFG(), context.getMetaAccess())) {
  49                         debug.log("Peeling %s", loop);
  50                         LoopTransformations.peel(loop);
  51                         debug.dump(DebugContext.DETAILED_LEVEL, graph, "Peeling %s", loop);
  52                     }
  53                 }
  54                 data.deleteUnusedNodes();
  55             } catch (Throwable t) {
  56                 throw debug.handle(t);
  57             }
  58         }
  59     }
  60 
  61     @Override
  62     public float codeSizeIncrease() {
  63         return 5.0f;
  64     }
  65 }