/*

 * Copyright (c) 2019, 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 static org.graalvm.compiler.bytecode.Bytecodes.GETSTATIC;

import static org.graalvm.compiler.bytecode.Bytecodes.INVOKESTATIC;

import static org.graalvm.compiler.bytecode.Bytecodes.NEW;

import static org.graalvm.compiler.bytecode.Bytecodes.PUTSTATIC;

import java.util.function.Supplier;

import org.graalvm.compiler.hotspot.nodes.KlassBeingInitializedCheckNode;

import org.graalvm.compiler.hotspot.nodes.type.KlassPointerStamp;

import org.graalvm.compiler.nodes.ConstantNode;

import org.graalvm.compiler.nodes.FrameState;

import org.graalvm.compiler.nodes.ValueNode;

import org.graalvm.compiler.nodes.graphbuilderconf.ClassInitializationPlugin;

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;

import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;

import jdk.vm.ci.meta.ConstantPool;

import jdk.vm.ci.meta.ResolvedJavaType;

public final class HotSpotJITClassInitializationPlugin implements ClassInitializationPlugin {

    @Override

    public boolean apply(GraphBuilderContext builder, ResolvedJavaType type, Supplier<FrameState> frameState, ValueNode[] classInit) {

        if (!type.isInitialized() && (type.isInstanceClass() || type.isInterface())) {

            int code = builder.getCode().getCode()[builder.bci()] & 0xff;

            switch (code) {

                case INVOKESTATIC:

                case GETSTATIC:

                case PUTSTATIC:

                case NEW:

                    ValueNode typeConstant = ConstantNode.forConstant(KlassPointerStamp.klass(), ((HotSpotResolvedObjectType) type).klass(), builder.getMetaAccess());

                    builder.add(new KlassBeingInitializedCheckNode(typeConstant));

                    return true;

                default:

            }

        }

        return false;

    }

    @Override

    public boolean supportsLazyInitialization(ConstantPool cp) {

        return false;

    }

    @Override

    public void loadReferencedType(GraphBuilderContext builder, ConstantPool cp, int cpi, int opcode) {

        cp.loadReferencedType(cpi, opcode);

    }

}