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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.cxf.common.util;
import java.lang.ref.WeakReference;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.cxf.common.classloader.ClassLoaderUtils;
import org.apache.cxf.common.util.ReflectionInvokationHandler.UnwrapParam;
import org.apache.cxf.common.util.ReflectionInvokationHandler.WrapReturn;
public class ASMHelper {
protected static final Map, String> PRIMITIVE_MAP = new HashMap, String>();
protected static final Map, String> NONPRIMITIVE_MAP = new HashMap, String>();
protected static final Map, WeakReference> LOADER_MAP
= new WeakIdentityHashMap, WeakReference>();
protected static boolean badASM;
private static Class cwClass;
static {
PRIMITIVE_MAP.put(Byte.TYPE, "B");
PRIMITIVE_MAP.put(Boolean.TYPE, "Z");
PRIMITIVE_MAP.put(Long.TYPE, "J");
PRIMITIVE_MAP.put(Integer.TYPE, "I");
PRIMITIVE_MAP.put(Short.TYPE, "S");
PRIMITIVE_MAP.put(Character.TYPE, "C");
PRIMITIVE_MAP.put(Float.TYPE, "F");
PRIMITIVE_MAP.put(Double.TYPE, "D");
NONPRIMITIVE_MAP.put(Byte.TYPE, Byte.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Boolean.TYPE, Boolean.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Long.TYPE, Long.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Integer.TYPE, Integer.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Short.TYPE, Short.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Character.TYPE, Character.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Float.TYPE, Float.class.getName().replaceAll("\\.", "/"));
NONPRIMITIVE_MAP.put(Double.TYPE, Double.class.getName().replaceAll("\\.", "/"));
}
private static void tryClass(String s) {
if (cwClass == null) {
try {
cwClass = ClassLoaderUtils.loadClass(s, ASMHelper.class);
} catch (Throwable t) {
//ignore
}
}
}
private static Class getASMClassWriterClass() {
//force this to make sure the proper OSGi import is generated
return org.objectweb.asm.ClassWriter.class;
}
private static synchronized Class getASMClass() throws ClassNotFoundException {
if (cwClass == null) {
//try the "real" asm first, then the others
tryClass("org.objectweb.asm.ClassWriter");
tryClass("org.apache.xbean.asm.ClassWriter");
tryClass("org.springframework.asm.ClassWriter");
if (cwClass == null) {
cwClass = getASMClassWriterClass();
}
}
return cwClass;
}
public static class Opcodes {
//CHECKSTYLE:OFF
//Will use reflection to set these based on the package name and such
//so we don't want them "final" or the compiler will optimize them out
//to just "0" which we really don't want
public static int ARETURN = 0;
public static int ALOAD = 0;
public static int IFNULL = 0;
public static int CHECKCAST = 0;
public static int INVOKEINTERFACE = 0;
public static int GETFIELD = 0;
public static int ASTORE = 0;
public static int PUTFIELD = 0;
public static int RETURN = 0;
public static int INVOKESPECIAL = 0;
public static int ACC_PUBLIC = 0;
public static int ACC_FINAL = 0;
public static int ACC_SUPER = 0;
public static int ACC_PRIVATE = 0;
public static int V1_5 = 0;
public static int ACC_ABSTRACT = 0;
public static int ACC_INTERFACE = 0;
public static int ILOAD = 0;
public static int IRETURN = 0;
public static int NEW = 0;
public static int DUP = 0;
public static int ATHROW = 0;
public static int INVOKEVIRTUAL = 0;
public static int GOTO = 0;
public static int POP = 0;
public static int ACONST_NULL = 0;
public static int IFNONNULL = 0;
public static int SIPUSH = 0;
public static int INVOKESTATIC = 0;
//CHECKSTYLE:ON
static {
try {
Class cls = getASMClass();
cls = ClassLoaderUtils.loadClass(cls.getPackage().getName() + ".Opcodes", cls);
for (Field f1 : Opcodes.class.getDeclaredFields()) {
Field f = cls.getDeclaredField(f1.getName());
ReflectionUtil.setAccessible(f1).set(null, ReflectionUtil.setAccessible(f).get(null));
}
} catch (Throwable e) {
//ignore
}
}
}
protected static String getMethodSignature(Method m) {
StringBuilder buf = new StringBuilder("(");
for (Class cl : m.getParameterTypes()) {
buf.append(getClassCode(cl));
}
buf.append(")");
buf.append(getClassCode(m.getReturnType()));
return buf.toString();
}
protected static String periodToSlashes(String s) {
char ch[] = s.toCharArray();
for (int x = 0; x < ch.length; x++) {
if (ch[x] == '.') {
ch[x] = '/';
}
}
return new String(ch);
}
public static String getClassCode(Class cl) {
if (cl == Void.TYPE) {
return "V";
}
if (cl.isPrimitive()) {
return PRIMITIVE_MAP.get(cl);
}
if (cl.isArray()) {
return "[" + getClassCode(cl.getComponentType());
}
return "L" + periodToSlashes(cl.getName()) + ";";
}
public static String getClassCode(java.lang.reflect.Type type) {
if (type instanceof Class) {
return getClassCode((Class)type);
} else if (type instanceof GenericArrayType) {
GenericArrayType at = (GenericArrayType)type;
return "[" + getClassCode(at.getGenericComponentType());
} else if (type instanceof TypeVariable) {
TypeVariable tv = (TypeVariable)type;
java.lang.reflect.Type[] bounds = tv.getBounds();
if (bounds != null && bounds.length == 1) {
return getClassCode(bounds[0]);
} else {
throw new IllegalArgumentException("Unable to determine type for: " + tv);
}
} else if (type instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType)type;
StringBuilder a = new StringBuilder(getClassCode(pt.getRawType()));
a.setLength(a.length() - 1);
a.append('<');
for (java.lang.reflect.Type t : pt.getActualTypeArguments()) {
a.append(getClassCode(t));
}
a.append(">;");
return a.toString();
} else if (type instanceof WildcardType) {
WildcardType wt = (WildcardType)type;
StringBuilder a = new StringBuilder();
java.lang.reflect.Type[] lowBounds = wt.getLowerBounds();
java.lang.reflect.Type[] upBounds = wt.getUpperBounds();
for (java.lang.reflect.Type t : upBounds) {
a.append("+");
a.append(getClassCode(t));
}
for (java.lang.reflect.Type t : lowBounds) {
a.append("-");
a.append(getClassCode(t));
}
return a.toString();
}
return null;
}
public ClassWriter createClassWriter() {
Object newCw = null;
if (!badASM) {
if (cwClass == null) {
try {
cwClass = getASMClass();
} catch (Throwable error) {
badASM = true;
throw new RuntimeException("No ASM ClassWriterFound", error);
}
}
try {
// ASM 1.5.x/2.x
Constructor cons
= cwClass.getConstructor(new Class[] {Boolean.TYPE});
try {
// got constructor, now check if it's 1.x which is very
// different from 2.x and 3.x
cwClass.getMethod("newConstInt", new Class[] {Integer.TYPE});
// newConstInt was removed in 2.x, if we get this far, we're
// using 1.5.x,
// set to null so we don't attempt to use it.
badASM = true;
} catch (Throwable t) {
newCw = cons.newInstance(new Object[] {Boolean.TRUE});
}
} catch (Throwable e) {
// ASM 3.x/4.x
try {
Constructor cons
= cwClass.getConstructor(new Class[] {Integer.TYPE});
int i = cwClass.getField("COMPUTE_MAXS").getInt(null);
i |= cwClass.getField("COMPUTE_FRAMES").getInt(null);
newCw = cons.newInstance(new Object[] {Integer.valueOf(i)});
} catch (Throwable e1) {
// ignore
}
}
}
if (newCw != null) {
return ReflectionInvokationHandler.createProxyWrapper(newCw, ClassWriter.class);
}
return null;
}
public Class loadClass(String className, Class clz , byte[] bytes) {
TypeHelperClassLoader loader = getTypeHelperClassLoader(clz);
synchronized (loader) {
Class cls = loader.lookupDefinedClass(className);
if (cls == null) {
return loader.defineClass(className, bytes);
}
return cls;
}
}
public Class findClass(String className, Class clz) {
TypeHelperClassLoader loader = getTypeHelperClassLoader(clz);
return loader.lookupDefinedClass(className);
}
private static synchronized TypeHelperClassLoader getTypeHelperClassLoader(Class l) {
WeakReference ref = LOADER_MAP.get(l);
TypeHelperClassLoader ret;
if (ref == null || ref.get() == null) {
ret = new TypeHelperClassLoader(l.getClassLoader());
LOADER_MAP.put(l, new WeakReference(ret));
} else {
ret = ref.get();
}
return ret;
}
public static class TypeHelperClassLoader extends ClassLoader {
ConcurrentHashMap> defined = new ConcurrentHashMap>();
TypeHelperClassLoader(ClassLoader parent) {
super(parent);
}
public Class lookupDefinedClass(String name) {
return defined.get(name.replace('/', '.'));
}
public Class defineClass(String name, byte bytes[]) {
Class ret = defined.get(name.replace('/', '.'));
if (ret != null) {
return ret;
}
if (name.endsWith("package-info")) {
Package p = super.getPackage(name.substring(0, name.length() - 13));
if (p == null) {
definePackage(name.substring(0, name.length() - 13).replace('/', '.'),
null,
null,
null,
null,
null,
null,
null);
}
}
ret = super.defineClass(name.replace('/', '.'), bytes, 0, bytes.length);
Class tmpRet = defined.putIfAbsent(name.replace('/', '.'), ret);
if (tmpRet != null) {
ret = tmpRet;
}
return ret;
}
}
public ASMType getType(final String type) {
try {
final Class cls = ClassLoaderUtils.loadClass(cwClass.getPackage().getName() + ".Type", cwClass);
final Method m = cls.getMethod("getType", String.class);
final Method m2 = cls.getMethod("getOpcode", Integer.TYPE);
@SuppressWarnings("unused")
ASMType t = new ASMType() {
Object tp = ReflectionUtil.setAccessible(m).invoke(null, type);
public Object getValue() {
return tp;
}
public Class realType() {
return cls;
}
public int getOpcode(int ireturn) {
try {
return (Integer)ReflectionUtil.setAccessible(m2).invoke(tp, ireturn);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
};
return t;
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public interface ASMType {
int getOpcode(int ireturn);
}
public Label createLabel() {
try {
final Class cls = ClassLoaderUtils.loadClass(cwClass.getPackage().getName() + ".Label",
cwClass);
@SuppressWarnings("unused")
Label l = new Label() {
Object l = cls.newInstance();
public Object getValue() {
return l;
}
public Class realType() {
return cls;
}
};
return l;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public interface ClassWriter {
@WrapReturn(AnnotationVisitor.class)
AnnotationVisitor visitAnnotation(String cls, boolean t);
@WrapReturn(FieldVisitor.class)
FieldVisitor visitField(int accPrivate, String fieldName, String classCode,
String fieldDescriptor, Object object);
void visitEnd();
byte[] toByteArray();
@WrapReturn(MethodVisitor.class)
MethodVisitor visitMethod(int accPublic, String string, String string2,
String s3,
String[] s4);
void visit(int v15, int i, String newClassName, String object, String string, String[] object2);
void visitSource(String arg0, String arg1);
}
public interface Label {
}
public interface FieldVisitor {
@WrapReturn(AnnotationVisitor.class)
AnnotationVisitor visitAnnotation(String cls, boolean b);
void visitEnd();
}
public interface MethodVisitor {
void visitEnd();
void visitLabel(@UnwrapParam(typeMethodName = "realType") Label l1);
void visitMaxs(int i, int j);
void visitLineNumber(int i, @UnwrapParam(typeMethodName = "realType") Label l0);
void visitInsn(int return1);
void visitVarInsn(int aload, int i);
void visitCode();
void visitLdcInsn(String sig);
void visitLocalVariable(String string,
String string2,
String string3,
@UnwrapParam(typeMethodName = "realType") Label lBegin,
@UnwrapParam(typeMethodName = "realType") Label lEnd,
int i);
void visitTypeInsn(int checkcast, String string);
void visitMethodInsn(int invokevirtual, String periodToSlashes,
String name, String methodSignature);
void visitIntInsn(int sipush, int x);
void visitFieldInsn(int getfield, String periodToSlashes,
String string, String string2);
void visitJumpInsn(int ifnonnull, @UnwrapParam(typeMethodName = "realType") Label nonNullLabel);
}
public interface AnnotationVisitor {
void visit(String arg0, @UnwrapParam(typeMethodName = "realType") ASMType arg1);
void visit(String arg0, Object arg1);
@WrapReturn(AnnotationVisitor.class)
AnnotationVisitor visitAnnotation(String arg0, String arg1);
@WrapReturn(AnnotationVisitor.class)
AnnotationVisitor visitArray(String arg0);
void visitEnd();
void visitEnum(String arg0, String arg1, String arg2);
}
}
