de.tuberlin.uebb.jbop.optimizer.methodsplitter.MethodSplitterTest.java Source code

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Here is the source code for de.tuberlin.uebb.jbop.optimizer.methodsplitter.MethodSplitterTest.java

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/*
 * Copyright (C) 2013 uebb.tu-berlin.de.
 *
 * This file is part of JBOP (Java Bytecode OPtimizer).
 *
 * JBOP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JBOP 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JBOP. If not, see <http://www.gnu.org/licenses/>.
 */
package de.tuberlin.uebb.jbop.optimizer.methodsplitter;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

import java.lang.reflect.Method;
import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;

import de.tuberlin.uebb.jbop.optimizer.ClassNodeBuilder;
import de.tuberlin.uebb.jbop.optimizer.loop.SplitMarkNode;
import de.tuberlin.uebb.jbop.optimizer.utils.NodeHelper;

/**
 * Tests for {@link MethodSplitter}.
 * 
 * @author Christopher Ewest
 */
public class MethodSplitterTest {

    private MethodSplitter splitter;
    private MethodNode method;
    private ClassNode classNode;
    private ClassNodeBuilder builder;
    private final int length = MethodSplitter.MAX_LENGTH / 10;
    private final int arrayLength = 750;

    /**
     * Init for every test.
     */
    @Before
    public void before() {
        builder = ClassNodeBuilder.createClass("de.tuberlin.uebb.jbop.optimizer.methodsplitter.SplitTestClass").//
                addMethod("testMethod", "()V");
        method = builder.getMethod("testMethod");
        classNode = builder.getClassNode();
        splitter = new MethodSplitter(classNode, length);
    }

    /**
     * Tests that methodSplitterArrayIsArgNoReturn() of the Testobject is working correctly.
     * 
     * @throws Exception
     *           the exception
     */
    @Test
    public void testMethodSplitterArrayIsArgNoReturn() throws Exception {
        // INIT
        classNode.name += "1";
        method.desc = "([I)V";
        fillArray().// arrayref
                addInsn(new InsnNode(Opcodes.RETURN));

        // RUN
        final InsnList splitted = splitter.optimize(method.instructions, method);
        final List<MethodNode> additionalMethods = splitter.getAdditionalMethods();

        // ASSERT

        // check methods
        assertFalse(additionalMethods.isEmpty());
        for (int i = 0; i < additionalMethods.size(); ++i) {
            final MethodNode methodNode = additionalMethods.get(i);
            assertEquals("([I)V", methodNode.desc);
        }

        // check that the class is valid by instantiating it
        method.instructions = splitted;
        classNode.methods.addAll(additionalMethods);
        final Object instance = builder.toClass().instance();

        // check method functionality
        final Method instanceMethod = instance.getClass().getMethod("testMethod", int[].class);
        instanceMethod.setAccessible(true);
        final int[] is = new int[arrayLength];
        instanceMethod.invoke(instance, is);
        for (int i = 0; i < arrayLength; ++i) {
            assertEquals((i + 1) * 2, is[i]);
        }
    }

    @Test
    public void testMethodSplitterCreateArrayAndReturn() throws Exception {
        // INIT
        classNode.name += "2";
        method.desc = "()[I";
        builder.addArray("[I", arrayLength);//
        fillArray().// arrayref
                addInsn(new InsnNode(Opcodes.ARETURN));

        // RUN
        final InsnList splitted = splitter.optimize(method.instructions, method);
        final List<MethodNode> additionalMethods = splitter.getAdditionalMethods();

        // ASSERT

        // check methods
        assertFalse(additionalMethods.isEmpty());
        for (int i = 0; i < (additionalMethods.size() - 1); ++i) {
            final MethodNode methodNode = additionalMethods.get(i);
            assertEquals("([I)[I", methodNode.desc);
        }
        final MethodNode methodNode = additionalMethods.get(additionalMethods.size() - 1);
        assertEquals("([I)[I", methodNode.desc);

        // check that the class is valid by instantiating it
        method.instructions = splitted;
        classNode.methods.addAll(additionalMethods);
        final Object instance = builder.toClass().instance();

        // check method functionality
        final Method intanceMethod = instance.getClass().getMethod("testMethod");
        intanceMethod.setAccessible(true);
        final int[] invoke = (int[]) intanceMethod.invoke(instance);
        for (int i = 0; i < arrayLength; ++i) {
            assertEquals((i + 1) * 2, invoke[i]);
        }
    }

    private ClassNodeBuilder fillArray() {
        for (int i = 0; i < arrayLength; ++i) {
            builder.addInsn(new VarInsnNode(Opcodes.ALOAD, 1)).// arrayref
                    addInsn(NodeHelper.getInsnNodeFor(i)).// index
                    addInsn(NodeHelper.getInsnNodeFor((i + 1) * 2)).// value
                    addInsn(new InsnNode(Opcodes.IASTORE)).//
                    addInsn(new SplitMarkNode());
        }
        builder.addInsn(new VarInsnNode(Opcodes.ALOAD, 1));
        return builder;
    }
}