001/*
002 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.hotspot;
024
025import java.lang.reflect.*;
026
027import jdk.internal.jvmci.code.*;
028import jdk.internal.jvmci.hotspot.*;
029import jdk.internal.jvmci.meta.*;
030
031import com.oracle.graal.api.replacements.*;
032import com.oracle.graal.hotspot.word.*;
033import com.oracle.graal.phases.util.*;
034import com.oracle.graal.replacements.*;
035
036/**
037 * Filters certain method substitutions based on whether there is underlying hardware support for
038 * them.
039 */
040public class HotSpotReplacementsImpl extends ReplacementsImpl {
041
042    private final HotSpotVMConfig config;
043
044    public HotSpotReplacementsImpl(Providers providers, SnippetReflectionProvider snippetReflection, HotSpotVMConfig config, TargetDescription target) {
045        super(providers, snippetReflection, target);
046        this.config = config;
047    }
048
049    @Override
050    protected boolean hasGenericInvocationPluginAnnotation(ResolvedJavaMethod method) {
051        return method.getAnnotation(HotSpotOperation.class) != null || super.hasGenericInvocationPluginAnnotation(method);
052    }
053
054    @Override
055    protected ResolvedJavaMethod registerMethodSubstitution(ClassReplacements cr, Executable originalMethod, Method substituteMethod) {
056        final Class<?> substituteClass = substituteMethod.getDeclaringClass();
057        if (substituteClass == IntegerSubstitutions.class || substituteClass == LongSubstitutions.class) {
058            if (substituteMethod.getName().equals("numberOfLeadingZeros")) {
059                if (config.useCountLeadingZerosInstruction) {
060                    return null;
061                }
062            } else if (substituteMethod.getName().equals("numberOfTrailingZeros")) {
063                if (config.useCountTrailingZerosInstruction) {
064                    return null;
065                }
066            }
067        }
068        return super.registerMethodSubstitution(cr, originalMethod, substituteMethod);
069    }
070}