/*

 * Copyright (c) 2012, 2018, 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 jdk.jfr.internal.instrument;

import static jdk.internal.org.objectweb.asm.Opcodes.ACONST_NULL;

import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD;

import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESTATIC;

import static jdk.internal.org.objectweb.asm.Opcodes.RETURN;

import jdk.internal.org.objectweb.asm.MethodVisitor;

import jdk.internal.org.objectweb.asm.Opcodes;

final class ConstructorWriter extends MethodVisitor {

    private boolean useInputParameter;

    private String shortClassName;

    private String fullClassName;

    ConstructorWriter(Class<?> classToChange, boolean useInputParameter) {

        super(Opcodes.ASM5);

        this.useInputParameter = useInputParameter;

        shortClassName = classToChange.getSimpleName();

        fullClassName = classToChange.getName().replace('.', '/');

    }

    @Override

    public void visitInsn(int opcode)

    {

        if (opcode == RETURN) {

            if (useInputParameter) {

                useInput();

            } else {

                noInput();

            }

        }

        mv.visitInsn(opcode);

    }

    @SuppressWarnings("deprecation")

    private void useInput()

    {

        //Load 'this' from local variable 0

        //Load first input parameter

        //Invoke ThrowableTracer.traceCLASS(this, parameter) for current class

        mv.visitVarInsn(ALOAD, 0);

        mv.visitVarInsn(ALOAD, 1);

        mv.visitMethodInsn(INVOKESTATIC, "jdk/jfr/internal/instrument/ThrowableTracer",

                "trace" + shortClassName, "(L" + fullClassName +

                ";Ljava/lang/String;)V");

    }

    @SuppressWarnings("deprecation")

    private void noInput()

    {

        //Load 'this' from local variable 0

        //Load ""

        //Invoke ThrowableTracer.traceCLASS(this, "") for current class

        mv.visitVarInsn(ALOAD, 0);

        mv.visitInsn(ACONST_NULL);

        mv.visitMethodInsn(INVOKESTATIC, "jdk/jfr/internal/instrument/ThrowableTracer",

                "trace" + shortClassName, "(L" + fullClassName +

                ";Ljava/lang/String;)V");

    }

    public void setMethodVisitor(MethodVisitor mv) {

        this.mv = mv;

    }

}