/*

 * 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.

 *

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package org.graalvm.compiler.core.test;

import org.junit.Test;

import org.objectweb.asm.ClassWriter;

import org.objectweb.asm.MethodVisitor;

import org.objectweb.asm.Label;

import jdk.vm.ci.meta.ResolvedJavaMethod;

public class TwoSlotMarkerClearingTest extends CustomizedBytecodePatternTest {

    @Test

    public void testTwoSlotMarkerClearing() throws ClassNotFoundException {

        Class<?> testClass = getClass("Test");

        ResolvedJavaMethod t1 = getResolvedJavaMethod(testClass, "t1");

        parseForCompile(t1);

        ResolvedJavaMethod t2 = getResolvedJavaMethod(testClass, "t2");

        parseForCompile(t2);

    }

    @Override

    protected byte[] generateClass(String className) {

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);

        cw.visit(52, ACC_SUPER | ACC_PUBLIC, className, null, "java/lang/Object", null);

        String getDescriptor = "(" + "JII" + ")" + "I";

        MethodVisitor t1 = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "t1", getDescriptor, null, null);

        t1.visitCode();

        t1.visitVarInsn(ILOAD, 2);

        t1.visitVarInsn(ISTORE, 0);

        t1.visitVarInsn(ILOAD, 0);

        Label label = new Label();

        t1.visitJumpInsn(IFGE, label);

        t1.visitVarInsn(ILOAD, 0);

        t1.visitInsn(IRETURN);

        t1.visitLabel(label);

        t1.visitVarInsn(ILOAD, 3);

        t1.visitInsn(IRETURN);

        t1.visitMaxs(4, 1);

        t1.visitEnd();

        getDescriptor = "(" + "IJIJ" + ")" + "J";

        MethodVisitor t2 = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "t2", getDescriptor, null, null);

        t2.visitCode();

        t2.visitVarInsn(LLOAD, 1);

        t2.visitVarInsn(LSTORE, 0);

        t2.visitVarInsn(ILOAD, 3);

        Label label1 = new Label();

        t2.visitJumpInsn(IFGE, label1);

        t2.visitVarInsn(LLOAD, 0);

        t2.visitInsn(LRETURN);

        t2.visitLabel(label1);

        t2.visitVarInsn(LLOAD, 4);

        t2.visitInsn(LRETURN);

        t2.visitMaxs(6, 2);

        t2.visitEnd();

        cw.visitEnd();

        return cw.toByteArray();

    }

}