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/*
 * Copyright (c) 2021, 2021, 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
 * questions.
 */
package com.oracle.svm.reflect.hosted;

// Checkstyle: allow reflection

import java.lang.reflect.Constructor;

import org.graalvm.compiler.debug.DebugContext;
import org.graalvm.compiler.nodes.CallTargetNode.InvokeKind;
import org.graalvm.compiler.nodes.InvokeWithExceptionNode;
import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.java.NewInstanceNode;

import com.oracle.graal.pointsto.meta.HostedProviders;
import com.oracle.svm.hosted.code.NonBytecodeStaticMethod;

import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaMethod;
import jdk.vm.ci.meta.ResolvedJavaType;

public class ReflectiveNewInstanceMethod extends NonBytecodeStaticMethod {

    private final Constructor constructor;

    public ReflectiveNewInstanceMethod(String name, ResolvedJavaMethod prototype, Constructor constructor) {
        super(name, prototype.getDeclaringClass(), prototype.getSignature(), prototype.getConstantPool());
        this.constructor = constructor;
    }

    @Override
    public StructuredGraph buildGraph(DebugContext ctx, ResolvedJavaMethod m, HostedProviders providers, Purpose purpose) {
        ReflectionGraphKit graphKit = new ReflectionGraphKit(ctx, providers, m);

        ValueNode argumentArray = graphKit.loadLocal(0, JavaKind.Object);
        /* Clear all locals, so that they are not alive and spilled at method calls. */
        graphKit.getFrameState().clearLocals();

        ResolvedJavaMethod targetMethod = providers.getMetaAccess().lookupJavaMethod(constructor);
        graphKit.emitEnsureInitializedCall(targetMethod.getDeclaringClass());

        Class[] argTypes = constructor.getParameterTypes();
        ValueNode[] args = new ValueNode[argTypes.length + 1];
        args[0] = graphKit.append(createNewInstanceNode(targetMethod.getDeclaringClass()));
        graphKit.fillArgsArray(argumentArray, 1, args, argTypes);

        InvokeWithExceptionNode invoke = graphKit.createJavaCallWithException(InvokeKind.Special, targetMethod, args);
        graphKit.exceptionPart();
        graphKit.branchToInvocationTargetException(graphKit.exceptionObject());
        graphKit.endInvokeWithException();
        graphKit.createReturn(args[0], JavaKind.Object);

        graphKit.emitIllegalArgumentException(constructor, null, argumentArray);
        graphKit.emitInvocationTargetException();
        processInvoke(graphKit, invoke);

        return graphKit.finalizeGraph();
    }

    protected ValueNode createNewInstanceNode(ResolvedJavaType type) {
        return new NewInstanceNode(type, true);
    }

    @SuppressWarnings("unused")
    protected void processInvoke(ReflectionGraphKit graphKit, InvokeWithExceptionNode invoke) {
    }
}