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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.bcel;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.ACONST_NULL;
import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GETSTATIC;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.LocalVariableGen;
import org.apache.bcel.generic.MethodGen;
import org.apache.bcel.generic.Type;
import org.junit.Test;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.LinkedList;
import java.util.List;
public class LocalVariableTypeTableTestCase extends AbstractTestCase {
public class TestClassLoader extends ClassLoader {
public TestClassLoader(ClassLoader parent) {
super(parent);
}
public Class<?> findClass(String name, byte[] bytes) {
return defineClass(name, bytes, 0, bytes.length);
}
}
@Test
public void testWithGenericArguement() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, IOException {
String targetClass = PACKAGE_BASE_NAME + ".data.SimpleClassHasMethodIncludeGenericArgument";
TestClassLoader loader = new TestClassLoader(getClass().getClassLoader());
Class cls = loader.findClass(targetClass, getBytesFromClass(targetClass));
java.lang.reflect.Method method = cls.getDeclaredMethod("a", String.class, List.class);
method.invoke(null, "a1", new LinkedList<String>());
method = cls.getDeclaredMethod("b", String.class, List.class);
method.invoke(null, "b1", new LinkedList<String>());
method = cls.getDeclaredMethod("c", String.class, String.class);
method.invoke(null, "c1", "c2");
method = cls.getDeclaredMethod("d", List.class, String.class);
method.invoke(null, new LinkedList<String>(), "d2");
}
private byte[] getBytesFromClass(String className) throws ClassNotFoundException, IOException {
JavaClass clazz = getTestClass(className);
ConstantPoolGen cp = new ConstantPoolGen(clazz.getConstantPool());
Method[] methods = clazz.getMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (!method.isNative() && !method.isAbstract())
methods[i] = injection(clazz, method, cp, findFirstStringLocalVariableOffset(method));
}
clazz.setConstantPool(cp.getFinalConstantPool());
return clazz.getBytes();
}
public Method injection(JavaClass clazz, Method method, ConstantPoolGen cp, int firstStringOffset) {
MethodGen methodGen = new MethodGen(method, clazz.getClassName(), cp);
InstructionList instructionList = methodGen.getInstructionList();
instructionList.insert(instructionList.getStart(), makeWillBeAddedInstructionList(methodGen, firstStringOffset));
methodGen.setMaxStack();
methodGen.setMaxLocals();
method = methodGen.getMethod();
instructionList.dispose();
return method;
}
public InstructionList makeWillBeAddedInstructionList(MethodGen methodGen, int firstStringOffset) {
if (firstStringOffset == -1)
return new InstructionList();
LocalVariableGen localVariableGen = methodGen.getLocalVariables()[firstStringOffset];
Instruction instruction;
if (localVariableGen != null)
instruction = new ALOAD(localVariableGen.getIndex());
else
instruction = new ACONST_NULL();
return createPrintln(methodGen.getConstantPool(), instruction);
}
public InstructionList createPrintln(ConstantPoolGen cp, Instruction instruction) {
final InstructionList il = new InstructionList();
final int out = cp.addFieldref("java.lang.System", "out", "Ljava/io/PrintStream;");
final int println = cp.addMethodref("java.io.PrintStream", "println", "(Ljava/lang/String;)V");
il.append(new GETSTATIC(out));
il.append(instruction);
il.append(new INVOKEVIRTUAL(println));
return il;
}
public int findFirstStringLocalVariableOffset(Method method) {
Type[] argumentTypes = method.getArgumentTypes();
int offset = -1;
for (int i = 0, count = argumentTypes.length; i < count; i++) {
if (Type.STRING.getSignature().equals(argumentTypes[i].getSignature())) {
if (method.isStatic())
offset = i;
else
offset = i + 1;
break;
}
}
return offset;
}
}
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