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 */
23package org.graalvm.compiler.loop.phases;
24
25import org.graalvm.compiler.debug.Debug;
26import org.graalvm.compiler.loop.LoopEx;
27import org.graalvm.compiler.loop.LoopPolicies;
28import org.graalvm.compiler.loop.LoopsData;
29import org.graalvm.compiler.nodes.StructuredGraph;
30import org.graalvm.compiler.phases.tiers.PhaseContext;
31
32public 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}
63