/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.reflect.impl.asm;
import org.codehaus.aspectwerkz.reflect.ClassInfo;
import org.codehaus.aspectwerkz.reflect.MethodInfo;
import org.codehaus.aspectwerkz.transform.inlining.AsmHelper;
import org.codehaus.aspectwerkz.annotation.instrumentation.asm.AsmAnnotationHelper;
import org.codehaus.aspectwerkz.exception.DefinitionException;
import org.codehaus.aspectwerkz.proxy.ProxyCompiler;
import org.objectweb.asm.Type;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.attrs.Attributes;
import java.util.List;
import java.util.ArrayList;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Modifier;
/**
* ASM implementation of the MethodInfo interface.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r </a>
*/
public class AsmMethodInfo extends AsmMemberInfo implements MethodInfo {
/**
* The return type name.
*/
private String m_returnTypeName = null;
/**
* A list with the parameter names as they appear in the source code.
* This information may not be available.
*/
protected String[] m_parameterNames = null;
/**
* A list with the parameter type names.
*/
private String[] m_parameterTypeNames = null;
/**
* A list with the exception type names.
*/
private String[] m_exceptionTypeNames = null;
/**
* The return type.
*/
private ClassInfo m_returnType = null;
/**
* A list with the parameter types.
*/
private ClassInfo[] m_parameterTypes = null;
/**
* A list with the exception types.
*/
private ClassInfo[] m_exceptionTypes = null;
/**
* Creates a new method info instance.
*
* @param method
* @param declaringType
* @param loader
*/
AsmMethodInfo(final MethodStruct method, final String declaringType, final ClassLoader loader) {
super(method, declaringType, loader);
m_returnTypeName = Type.getReturnType(method.desc).getClassName();
Type[] argTypes = Type.getArgumentTypes(method.desc);
m_parameterTypeNames = new String[argTypes.length];
for (int i = 0; i < argTypes.length; i++) {
m_parameterTypeNames[i] = argTypes[i].getClassName();
}
// FIXME: how to do exceptions? needed?
m_exceptionTypeNames = new String[]{};
}
/**
* Returns the method info for the method specified.
*
* @param methodName
* @param methodDesc
* @param bytecode
* @param loader
* @return the method info
*/
public static MethodInfo getMethodInfo(final String methodName,
final String methodDesc,
final byte[] bytecode,
final ClassLoader loader) {
String className = AsmClassInfo.retrieveClassNameFromBytecode(bytecode);
AsmClassInfoRepository repository = AsmClassInfoRepository.getRepository(loader);
ClassInfo classInfo = repository.getClassInfo(className);
if (classInfo == null) {
classInfo = AsmClassInfo.getClassInfo(bytecode, loader);
}
return classInfo.getMethod(AsmHelper.calculateMethodHash(methodName, methodDesc));
}
/**
* Returns the signature for the element.
*
* @return the signature for the element
*/
public String getSignature() {
return AsmHelper.getMethodDescriptor(this);
}
/**
* Returns the return type.
*
* @return the return type
*/
public ClassInfo getReturnType() {
if (m_returnType == null) {
m_returnType = AsmClassInfo.getClassInfo(m_returnTypeName, (ClassLoader) m_loaderRef.get());
}
return m_returnType;
}
/**
* Returns the parameter types.
*
* @return the parameter types
*/
public ClassInfo[] getParameterTypes() {
if (m_parameterTypes == null) {
m_parameterTypes = new ClassInfo[m_parameterTypeNames.length];
for (int i = 0; i < m_parameterTypeNames.length; i++) {
m_parameterTypes[i] = AsmClassInfo.getClassInfo(
m_parameterTypeNames[i],
(ClassLoader) m_loaderRef.get()
);
}
}
return m_parameterTypes;
}
/**
* Returns the parameter names as they appear in the source code.
* This information is available only when class are compiled with javac -g (debug info), but is required
* for Aspect that are using args() and target()/this() bindings.
* <p/>
* It returns null if not available.
*
* @return
*/
public String[] getParameterNames() {
return m_parameterNames;
}
/**
* Returns the exception types.
*
* @return the exception types
*/
public ClassInfo[] getExceptionTypes() {
if (m_exceptionTypes == null) {
m_exceptionTypes = new ClassInfo[m_exceptionTypeNames.length];
for (int i = 0; i < m_exceptionTypeNames.length; i++) {
m_exceptionTypes[i] = AsmClassInfo.getClassInfo(
m_exceptionTypeNames[i],
(ClassLoader) m_loaderRef.get()
);
}
}
return m_exceptionTypes;
}
/**
* Returns the annotations.
*
* @return the annotations
*/
public List getAnnotations() {
if (m_annotations == null) {
try {
InputStream in = null;
ClassReader cr = null;
try {
if ((ClassLoader) m_loaderRef.get() != null) {
in = ((ClassLoader) m_loaderRef.get()).getResourceAsStream(
m_declaringTypeName.replace('.', '/') + ".class"
);
} else {
in = ClassLoader.getSystemClassLoader().getResourceAsStream(
m_declaringTypeName.replace('.', '/') + ".class"
);
}
if (in == null) {
in = ProxyCompiler.getProxyResourceAsStream((ClassLoader) m_loaderRef.get(), m_declaringTypeName);
}
cr = new ClassReader(in);
} finally {
try {
in.close();
} catch (Exception e) {
;
}
}
List annotations = new ArrayList();
cr.accept(
new AsmAnnotationHelper.MethodAnnotationExtractor(
annotations, m_member.name, m_member.desc, (ClassLoader) m_loaderRef.get()
),
Attributes.getDefaultAttributes(),
true
);
m_annotations = annotations;
} catch (IOException e) {
// unlikely to occur since ClassInfo relies on getResourceAsStream
System.err.println(
"WARN - could not load " + m_declaringTypeName + " as a resource to retrieve annotations"
);
m_annotations = AsmClassInfo.EMPTY_LIST;
}
}
return m_annotations;
}
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof MethodInfo)) {
return false;
}
MethodInfo methodInfo = (MethodInfo) o;
if (!m_declaringTypeName.equals(methodInfo.getDeclaringType().getName())) {
return false;
}
if (!m_member.name.equals(methodInfo.getName())) {
return false;
}
ClassInfo[] parameterTypes = methodInfo.getParameterTypes();
if (m_parameterTypeNames.length != parameterTypes.length) {//check on names length for lazyness optim
return false;
}
for (int i = 0; i < m_parameterTypeNames.length; i++) {
if (!m_parameterTypeNames[i].equals(parameterTypes[i].getName())) {
return false;
}
}
return true;
}
public int hashCode() {
int result = 29;
result = (29 * result) + m_declaringTypeName.hashCode();
result = (29 * result) + m_member.name.hashCode();
for (int i = 0; i < m_parameterTypeNames.length; i++) {
result = (29 * result) + m_parameterTypeNames[i].hashCode();
}
return result;
}
public String toString() {
StringBuffer sb = new StringBuffer(m_declaringTypeName);
sb.append('.').append(m_member.name);
sb.append(m_member.desc);
return sb.toString();
}
/**
* Update the parameter name given the parameter information
* the index is the one from the register ie a long or double will needs 2 register
*
* @param registerIndex
* @param parameterName
*/
public void pushParameterNameFromRegister(int registerIndex, String parameterName) {
int registerStart = 1;
if (Modifier.isStatic(m_member.modifiers)) {
registerStart = 0;
}
// assume we have a stack starting at the first parameter
int registerIndexFrom0 = registerIndex - registerStart;
Type[] parameters = Type.getArgumentTypes(m_member.desc);
int typeIndex = AsmHelper.getTypeIndexOf(parameters, registerIndexFrom0);
if (typeIndex >= 0 && typeIndex < m_parameterNames.length) {
m_parameterNames[typeIndex] = parameterName;
} else {
throw new DefinitionException("Could not register parameter named " + parameterName
+ " from register " + registerIndex + " for " + m_member.name + "." + m_member.desc);
}
}
}