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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.openjpa.util.asm;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Optional;
import org.apache.xbean.asm9.Attribute;
import org.apache.xbean.asm9.ClassReader;
import org.apache.xbean.asm9.ClassWriter;
import org.apache.xbean.asm9.Opcodes;
import org.apache.xbean.asm9.Type;
import org.apache.xbean.asm9.tree.AbstractInsnNode;
import org.apache.xbean.asm9.tree.ClassNode;
import org.apache.xbean.asm9.tree.FieldInsnNode;
import org.apache.xbean.asm9.tree.InsnList;
import org.apache.xbean.asm9.tree.InsnNode;
import org.apache.xbean.asm9.tree.IntInsnNode;
import org.apache.xbean.asm9.tree.LdcInsnNode;
import org.apache.xbean.asm9.tree.MethodInsnNode;
import org.apache.xbean.asm9.tree.MethodNode;
import org.apache.xbean.asm9.tree.TypeInsnNode;
import org.apache.xbean.asm9.tree.VarInsnNode;
/**
* Utility methods to deal with ASM bytecode
*
* @author Mark Struberg
*/
public final class AsmHelper {
public static final Type TYPE_OBJECT = Type.getType(Object.class);
private static final char[] PRIMITIVE_DESCRIPTORS = {'V','Z','C','B','S','I','F','J','D'};
public static final Attribute[] ATTRS = new Attribute[] {
new RedefinedAttribute()
};
private AsmHelper() {
// utility class ct
}
/**
* Read the binary bytecode from the class with the given name
* @param clazz the class to read into the ClassNode
* @return the ClassNode constructed from that class
*/
public static ClassNode readClassNode(Class clazz) {
int extPos = clazz.getName().lastIndexOf('.') + 1;
String className = clazz.getName().substring(extPos);
try (InputStream in = clazz.getResourceAsStream(className + ".class")) {
ClassReader cr = new ClassReader(in);
ClassNode classNode = new ClassNode();
cr.accept(classNode, ATTRS, 0);
return classNode;
}
catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Read the binary bytecode from the class with the given name
* @param classLoader the ClassLoader to use
* @param className the fully qualified class name to read. e.g. "org.mycorp.mypackage.MyEntity"
* @return the ClassNode constructed from that class
*/
public static ClassNode readClassNode(ClassLoader classLoader, String className) throws ClassNotFoundException {
ClassReader cr;
final String classResourceName = className.replace(".", "/") + ".class";
try (final InputStream classBytesStream = classLoader.getResourceAsStream(classResourceName)) {
cr = new ClassReader(classBytesStream);
}
catch (IOException e) {
throw new ClassNotFoundException("Cannot read ClassNode for class " + className, e);
}
ClassNode classNode = new ClassNode();
cr.accept(classNode, ATTRS, 0);
return classNode;
}
public static byte[] getClassBytes(final String typeName)
{
final ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
final InputStream stream = Thread.currentThread().getContextClassLoader()
.getResourceAsStream(typeName + ".class");
if (stream == null) {
return null;
}
try {
int c;
byte[] buffer = new byte[1024];
while ((c = stream.read(buffer)) >= 0) {
baos.write(buffer, 0, c);
}
} catch (IOException e) {
return null;
} finally {
try {
stream.close();
} catch (IOException e) {
// no-op
}
}
return baos.toByteArray();
}
/**
* Create a byte[] of that class represented by the ClassNodeTracker
*/
public static byte[] toByteArray(ClassNodeTracker cnt) {
ClassWriter cw = new BCClassWriter(ClassWriter.COMPUTE_FRAMES, cnt.getClassLoader());
cnt.getClassNode().accept(cw);
return cw.toByteArray();
}
public static Optional getMethodNode(ClassNode classNode, Method meth) {
final String mDesc = Type.getMethodDescriptor(meth);
return classNode.methods.stream()
.filter(mn -> mn.name.equals(meth.getName()) && mn.desc.equals(mDesc))
.findAny();
}
public static Optional getMethodNode(ClassNode classNode, String methodName, Class returnType, Class... paramTypes) {
Type[] parms = Arrays.stream(paramTypes)
.map(Type::getType)
.toArray(Type[]::new);
final String mDesc = Type.getMethodDescriptor(Type.getType(returnType), parms);
return classNode.methods.stream()
.filter(mn -> mn.name.equals(methodName) && mn.desc.equals(mDesc))
.findAny();
}
/**
* Calclates the proper Return instruction opcode for the given class
*
* @param type the type to get returned
* @return the proper Opcode RETURN, ARETURN, IRETURN, etc
*/
public static int getReturnInsn(Class type) {
if (type.equals(Void.TYPE)) {
return Opcodes.RETURN;
}
if (type.isPrimitive()) {
if (Integer.TYPE.equals(type)) {
return Opcodes.IRETURN;
}
else if (Boolean.TYPE.equals(type)) {
return Opcodes.IRETURN;
}
else if (Character.TYPE.equals(type)) {
return Opcodes.IRETURN;
}
else if (Byte.TYPE.equals(type)) {
return Opcodes.IRETURN;
}
else if (Short.TYPE.equals(type)) {
return Opcodes.IRETURN;
}
else if (Float.TYPE.equals(type)) {
return Opcodes.FRETURN;
}
else if (Long.TYPE.equals(type)) {
return Opcodes.LRETURN;
}
else if (Double.TYPE.equals(type)) {
return Opcodes.DRETURN;
}
}
return Opcodes.ARETURN;
}
public static AbstractInsnNode getLoadConstantInsn(Object val) {
if (val == null) {
return new InsnNode(Opcodes.ACONST_NULL);
}
if (val instanceof Integer) {
final int iVal = (Integer) val;
switch (iVal) {
case 0:
return new InsnNode(Opcodes.ICONST_0);
case 1:
return new InsnNode(Opcodes.ICONST_1);
case 2:
return new InsnNode(Opcodes.ICONST_2);
case 3:
return new InsnNode(Opcodes.ICONST_3);
case 4:
return new InsnNode(Opcodes.ICONST_4);
case 5:
return new InsnNode(Opcodes.ICONST_5);
default:
break;
}
if (iVal < 0 && iVal >= -128 || iVal >= 6 && iVal < 128) {
// use bipush for small numbers
return new IntInsnNode(Opcodes.BIPUSH, iVal);
}
else if (iVal < -128 && iVal >= -32768 || iVal >= 128 && iVal < 32768) {
// use sipush for a bit bigger numbers
return new IntInsnNode(Opcodes.SIPUSH, iVal);
}
}
if (val instanceof Boolean) {
if ((Boolean)val) {
return new InsnNode(Opcodes.ICONST_1);
}
else {
return new InsnNode(Opcodes.ICONST_0);
}
}
if (val instanceof Long) {
if ((Long) val == 0L) {
return new InsnNode(Opcodes.LCONST_0);
}
if ((Long) val == 1L) {
return new InsnNode(Opcodes.LCONST_1);
}
}
if (val instanceof Float) {
if ((Float) val == 0F) {
return new InsnNode(Opcodes.FCONST_0);
}
if ((Float) val == 1F) {
return new InsnNode(Opcodes.FCONST_1);
}
if ((Float) val == 2F) {
return new InsnNode(Opcodes.FCONST_2);
}
}
if (val instanceof Double) {
if ((Double) val == 0D) {
return new InsnNode(Opcodes.DCONST_0);
}
if ((Double) val == 1D) {
return new InsnNode(Opcodes.DCONST_1);
}
}
if (val instanceof Class) {
if (boolean.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Boolean.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (char.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Character.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (int.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Integer.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (long.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Long.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (byte.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Byte.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (short.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Short.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (float.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Float.class), "TYPE",
Type.getDescriptor(Class.class));
}
if (double.class.equals(val)) {
return new FieldInsnNode(Opcodes.GETSTATIC, Type.getInternalName(Double.class), "TYPE",
Type.getDescriptor(Class.class));
}
return new LdcInsnNode(Type.getType((Class) val));
}
return new LdcInsnNode(val);
}
/**
* Calclates the proper STORE instruction opcode for the given type
*
* @param type the type to get stored
* @return the proper Opcode ISTORE, ASTORE, LSTORE, etc
*/
public static int getStoreInsn(Class type) {
if (type.equals(Void.TYPE)) {
throw new IllegalArgumentException("Void type cannot be stored");
}
if (type.isPrimitive()) {
if (Integer.TYPE.equals(type)) {
return Opcodes.ISTORE;
}
else if (Boolean.TYPE.equals(type)) {
return Opcodes.ISTORE;
}
else if (Character.TYPE.equals(type)) {
return Opcodes.ISTORE;
}
else if (Byte.TYPE.equals(type)) {
return Opcodes.ISTORE;
}
else if (Short.TYPE.equals(type)) {
return Opcodes.ISTORE;
}
else if (Float.TYPE.equals(type)) {
return Opcodes.FSTORE;
}
else if (Long.TYPE.equals(type)) {
return Opcodes.LSTORE;
}
else if (Double.TYPE.equals(type)) {
return Opcodes.DSTORE;
}
}
return Opcodes.ASTORE;
}
/**
* Calclates the proper LOAD instruction opcode for the given type.
* This is the appropriate bytecode instruction to load a value from a variable to the stack.
*
* @param type the type to get loaded
* @return the proper Opcode ILOAD, ALOAD, LLOAD, etc
*/
public static int getLoadInsn(Class type) {
if (type.equals(Void.TYPE)) {
throw new IllegalArgumentException("Void type cannot be loaded");
}
if (type.isPrimitive()) {
if (Integer.TYPE.equals(type)) {
return Opcodes.ILOAD;
}
else if (Boolean.TYPE.equals(type)) {
return Opcodes.ILOAD;
}
else if (Character.TYPE.equals(type)) {
return Opcodes.ILOAD;
}
else if (Byte.TYPE.equals(type)) {
return Opcodes.ILOAD;
}
else if (Short.TYPE.equals(type)) {
return Opcodes.ILOAD;
}
else if (Float.TYPE.equals(type)) {
return Opcodes.FLOAD;
}
else if (Long.TYPE.equals(type)) {
return Opcodes.LLOAD;
}
else if (Double.TYPE.equals(type)) {
return Opcodes.DLOAD;
}
}
return Opcodes.ALOAD;
}
/**
* Get the internal names for the given classes
* @see Type#getInternalName(Class)
*/
public static String[] getInternalNames(Class[] classes) {
String[] internalNames = new String[classes.length];
for (int i=0; i[] params) {
Type[] types = new Type[params.length];
for (int i=0; i 0;
if (!isStatic) {
// only static methods start with 0
// non-static have the this* on pos 0.
varPos--;
}
final Type[] paramTypes = Type.getArgumentTypes(methodNode.desc);
int pos = 0;
for (int i=0; i getDescribedClass(ClassLoader classLoader, String typeDesc) {
if (typeDesc == null || typeDesc.isEmpty()) {
return null;
}
if (typeDesc.charAt(0) == '[') {
switch (typeDesc.charAt(1)) {
case 'V':
throw new IllegalArgumentException("There is no such thing as a void array");
case 'Z':
return boolean[].class;
case 'C':
return char[].class;
case 'B':
return byte[].class;
case 'S':
return short[].class;
case 'I':
return int[].class;
case 'F':
return float[].class;
case 'J':
return long[].class;
case 'D':
return double[].class;
default:
// some object array
Class clazz = getClass(classLoader, typeDesc.substring(1));
return Array.newInstance(clazz, 0).getClass();
}
}
switch (typeDesc.charAt(0)) {
case 'V':
return void.class;
case 'Z':
return boolean.class;
case 'C':
return char.class;
case 'B':
return byte.class;
case 'S':
return short.class;
case 'I':
return int.class;
case 'F':
return float.class;
case 'J':
return long.class;
case 'D':
return double.class;
case 'L':
if (typeDesc.charAt(typeDesc.length()-1) == ';')
return getClass(classLoader, typeDesc.substring(1, typeDesc.length()-1));
default:
// some kind of class
return getClass(classLoader, typeDesc);
}
}
/**
* Helper method to add the code necessary to throw the given
* exception type, sans message.
*/
public static InsnList throwException(Class type) {
return throwException(type, null);
}
/**
* Helper method to add the code necessary to throw the given
* exception type, sans message.
*/
public static InsnList throwException(Class type, String msg) {
InsnList instructions = new InsnList();
instructions.add(new TypeInsnNode(Opcodes.NEW, Type.getInternalName(type)));
instructions.add(new InsnNode(Opcodes.DUP));
if (msg != null) {
instructions.add(AsmHelper.getLoadConstantInsn(msg));
}
String desc = msg != null
? Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(String.class))
: Type.getMethodDescriptor(Type.VOID_TYPE);
instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL,
Type.getInternalName(type),
"",
desc));
instructions.add(new InsnNode(Opcodes.ATHROW));
return instructions;
}
public static Class getClass(ClassLoader classLoader, String internalTypeName) {
try {
return Class.forName(internalTypeName.replace("/", "."), false, classLoader);
}
catch (NoClassDefFoundError | ClassNotFoundException e) {
return null;
}
}
/**
* Calculate the next local variable position.
* For a non-static method the position 0 on the stack is the this pointer.
* After that there are all the method parameters.
* For a static method the method parameters begin at position zero.
* This method does calculate the first unused stack position which can be used for xLOAD/xSTORE opterations, e.g.
*
* int nextVarPos = AsmHelper.getLocalVarPos(myMethodNode);
* instructions.add(AsmHelper.getLoadConstantInsn(4711));
* instructions.add(new VarInsnNode(Opcodes.ISTORE, nextVarPos);
*
*
* @return the 0-based position on the stack at which the local variables can be located.
*/
public static int getLocalVarPos(MethodNode meth) {
final Type[] paramTypes = Type.getArgumentTypes(meth.desc);
// stack position 0 is this pointer for non-static methods
// In other words: for a static method the first free stack location is 1,
// for non-static it is 2
int pos = ((meth.access & Opcodes.ACC_STATIC) > 0) ? 0 : 1;
// and now add the size of the parameters
for (Type paramType : paramTypes) {
pos += paramType.getSize();
}
return pos;
}
}
