/*

 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.graalvm.compiler.hotspot.meta;

import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;

import org.graalvm.compiler.hotspot.HotSpotGraalRuntimeProvider;

import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;

import org.graalvm.compiler.word.WordTypes;

import jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider;

import jdk.vm.ci.hotspot.HotSpotObjectConstant;

import jdk.vm.ci.meta.JavaConstant;

import jdk.vm.ci.meta.JavaKind;

import jdk.vm.ci.meta.ResolvedJavaType;

public class HotSpotSnippetReflectionProvider implements SnippetReflectionProvider {

    private final HotSpotGraalRuntimeProvider runtime;

    private final HotSpotConstantReflectionProvider constantReflection;

    private final WordTypes wordTypes;

    public HotSpotSnippetReflectionProvider(HotSpotGraalRuntimeProvider runtime, HotSpotConstantReflectionProvider constantReflection, WordTypes wordTypes) {

        this.runtime = runtime;

        this.constantReflection = constantReflection;

        this.wordTypes = wordTypes;

    }

    @Override

    public JavaConstant forObject(Object object) {

        return constantReflection.forObject(object);

    }

    @Override

    public Object asObject(ResolvedJavaType type, JavaConstant constant) {

        if (constant.isNull()) {

            return null;

        }

        HotSpotObjectConstant hsConstant = (HotSpotObjectConstant) constant;

        return hsConstant.asObject(type);

    }

    @Override

    public <T> T asObject(Class<T> type, JavaConstant constant) {

        if (constant.isNull()) {

            return null;

        }

        HotSpotObjectConstant hsConstant = (HotSpotObjectConstant) constant;

        return hsConstant.asObject(type);

    }

    @Override

    public JavaConstant forBoxed(JavaKind kind, Object value) {

        if (kind == JavaKind.Object) {

            return forObject(value);

        } else {

            return JavaConstant.forBoxedPrimitive(value);

        }

    }

    // Lazily initialized

    private Class<?> wordTypesType;

    private Class<?> runtimeType;

    private Class<?> configType;

    @Override

    public <T> T getInjectedNodeIntrinsicParameter(Class<T> type) {

        // Need to test all fields since there no guarantee under the JMM

        // about the order in which these fields are written.

        GraalHotSpotVMConfig config = runtime.getVMConfig();

        if (configType == null || wordTypesType == null || runtimeType == null) {

            wordTypesType = wordTypes.getClass();

            runtimeType = runtime.getClass();

            configType = config.getClass();

        }

        if (type.isAssignableFrom(wordTypesType)) {

            return type.cast(wordTypes);

        }

        if (type.isAssignableFrom(runtimeType)) {

            return type.cast(runtime);

        }

        if (type.isAssignableFrom(configType)) {

            return type.cast(config);

        }

        return null;

    }

}