1 /*
   2  * Copyright (c) 2012, 2015, 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 package org.graalvm.compiler.loop.phases;
  24 
  25 import org.graalvm.compiler.debug.Debug;
  26 import org.graalvm.compiler.loop.LoopEx;
  27 import org.graalvm.compiler.loop.LoopPolicies;
  28 import org.graalvm.compiler.loop.LoopsData;
  29 import org.graalvm.compiler.nodes.StructuredGraph;
  30 import org.graalvm.compiler.phases.tiers.PhaseContext;
  31 
  32 public class LoopPeelingPhase extends LoopPhase<LoopPolicies> {
  33 
  34     public LoopPeelingPhase(LoopPolicies policies) {
  35         super(policies);
  36     }
  37 
  38     @Override
  39     @SuppressWarnings("try")
  40     protected void run(StructuredGraph graph, PhaseContext context) {
  41         if (graph.hasLoops()) {
  42             LoopsData data = new LoopsData(graph);
  43             try (Debug.Scope s = Debug.scope("peeling", data.getCFG())) {
  44                 for (LoopEx loop : data.outerFirst()) {
  45                     if (getPolicies().shouldPeel(loop, data.getCFG(), context.getMetaAccess())) {
  46                         Debug.log("Peeling %s", loop);
  47                         LoopTransformations.peel(loop);
  48                         Debug.dump(Debug.INFO_LOG_LEVEL, graph, "Peeling %s", loop);
  49                     }
  50                 }
  51                 data.deleteUnusedNodes();
  52             } catch (Throwable t) {
  53                 throw Debug.handle(t);
  54             }
  55         }
  56     }
  57 
  58     @Override
  59     public float codeSizeIncrease() {
  60         return 5.0f;
  61     }
  62 }