com.oracle.svm.hosted.meta.HostedSnippetReflectionProvider Maven / Gradle / Ivy

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/*
 * Copyright (c) 2015, 2017, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
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 */
package com.oracle.svm.hosted.meta;

import org.graalvm.compiler.word.WordTypes;
import org.graalvm.word.WordBase;

import com.oracle.graal.pointsto.meta.AnalysisType;
import com.oracle.svm.core.FrameAccess;
import com.oracle.svm.core.graal.meta.SubstrateSnippetReflectionProvider;
import com.oracle.svm.core.hub.DynamicHub;
import com.oracle.svm.core.meta.SubstrateObjectConstant;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.SVMHost;
import com.oracle.svm.hosted.c.GraalAccess;

import jdk.vm.ci.meta.JavaConstant;

public class HostedSnippetReflectionProvider extends SubstrateSnippetReflectionProvider {

    private final SVMHost hostVM;

    public HostedSnippetReflectionProvider(SVMHost hostVM, WordTypes wordTypes) {
        super(wordTypes);
        this.hostVM = hostVM;
    }

    @Override
    public JavaConstant forObject(Object object) {
        if (object instanceof WordBase) {
            return JavaConstant.forIntegerKind(FrameAccess.getWordKind(), ((WordBase) object).rawValue());
        }
        return super.forObject(object);
    }

    @Override
    public  T asObject(Class type, JavaConstant constant) {
        if ((type == Class.class || type == Object.class) && constant instanceof SubstrateObjectConstant) {
            Object objectValue = SubstrateObjectConstant.asObject(constant);
            if (objectValue instanceof DynamicHub) {
                return type.cast(interceptClass((DynamicHub) objectValue));
            }
        }
        return super.asObject(type, constant);
    }

    protected Class interceptClass(DynamicHub dynamicHub) {
        AnalysisType type = hostVM.lookupType(dynamicHub);
        try {
            return GraalAccess.getOriginalSnippetReflection().asObject(Class.class, GraalAccess.getOriginalProviders().getConstantReflection().asJavaClass(type.getWrapped()));
        } catch (Throwable ex) {
            throw VMError.shouldNotReachHere("Cannot look up Java class for a DynamicHub: " + dynamicHub.getName() + " - is it a substitution type?");
        }
    }
}