package com.esotericsoftware.reflectasm;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import static org.objectweb.asm.Opcodes.*;
public abstract class MethodAccess {
static public MethodAccess get (Class type) {
AccessClassLoader loader = AccessClassLoader.get(type);
ArrayList<Method> methods = new ArrayList();
Class nextClass = type;
while (nextClass != Object.class) {
Method[] declaredMethods = nextClass.getDeclaredMethods();
for (int i = 0, n = declaredMethods.length; i < n; i++) {
Method method = declaredMethods[i];
int modifiers = method.getModifiers();
if (Modifier.isStatic(modifiers)) continue;
if (Modifier.isPrivate(modifiers)) continue;
methods.add(method);
}
nextClass = nextClass.getSuperclass();
}
String className = type.getName();
String accessClassName = className + "MethodAccess";
if (accessClassName.startsWith("java.")) accessClassName = "reflectasm." + accessClassName;
Class accessClass = null;
try {
accessClass = loader.loadClass(accessClassName);
} catch (ClassNotFoundException ignored) {
}
if (accessClass == null) {
String accessClassNameInternal = accessClassName.replace('.', '/');
String classNameInternal = className.replace('.', '/');
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
MethodVisitor mv;
cw.visit(V1_1, ACC_PUBLIC + ACC_SUPER, accessClassNameInternal, null, "com/esotericsoftware/reflectasm/MethodAccess",
null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "com/esotericsoftware/reflectasm/MethodAccess", "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_VARARGS, "invoke", "(Ljava/lang/Object;I[Ljava/lang/Object;)Ljava/lang/Object;",
null, null);
mv.visitCode();
if (!methods.isEmpty()) {
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, classNameInternal);
mv.visitVarInsn(ASTORE, 4);
mv.visitVarInsn(ILOAD, 2);
Label[] labels = new Label[methods.size()];
for (int i = 0, n = labels.length; i < n; i++)
labels[i] = new Label();
Label defaultLabel = new Label();
mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
StringBuilder buffer = new StringBuilder(128);
for (int i = 0, n = labels.length; i < n; i++) {
mv.visitLabel(labels[i]);
if (i == 0)
mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] {classNameInternal}, 0, null);
else
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
mv.visitVarInsn(ALOAD, 4);
buffer.setLength(0);
buffer.append('(');
Method method = methods.get(i);
Class[] paramTypes = method.getParameterTypes();
for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) {
mv.visitVarInsn(ALOAD, 3);
mv.visitIntInsn(BIPUSH, paramIndex);
mv.visitInsn(AALOAD);
Type paramType = Type.getType(paramTypes[paramIndex]);
switch (paramType.getSort()) {
case Type.BOOLEAN:
mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z");
break;
case Type.BYTE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Byte");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Byte", "byteValue", "()B");
break;
case Type.CHAR:
mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Character", "charValue", "()C");
break;
case Type.SHORT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Short");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Short", "shortValue", "()S");
break;
case Type.INT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Integer", "intValue", "()I");
break;
case Type.FLOAT:
mv.visitTypeInsn(CHECKCAST, "java/lang/Float");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Float", "floatValue", "()F");
break;
case Type.LONG:
mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Long", "longValue", "()J");
break;
case Type.DOUBLE:
mv.visitTypeInsn(CHECKCAST, "java/lang/Double");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Double", "doubleValue", "()D");
break;
case Type.ARRAY:
mv.visitTypeInsn(CHECKCAST, paramType.getDescriptor());
break;
case Type.OBJECT:
mv.visitTypeInsn(CHECKCAST, paramType.getInternalName());
break;
}
buffer.append(paramType.getDescriptor());
}
buffer.append(')');
buffer.append(Type.getDescriptor(method.getReturnType()));
mv.visitMethodInsn(INVOKEVIRTUAL, classNameInternal, method.getName(), buffer.toString());
switch (Type.getType(method.getReturnType()).getSort()) {
case Type.VOID:
mv.visitInsn(ACONST_NULL);
break;
case Type.BOOLEAN:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;");
break;
case Type.BYTE:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;");
break;
case Type.CHAR:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;");
break;
case Type.SHORT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Short", "valueOf", "(S)Ljava/lang/Short;");
break;
case Type.INT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;");
break;
case Type.FLOAT:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Float", "valueOf", "(F)Ljava/lang/Float;");
break;
case Type.LONG:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;");
break;
case Type.DOUBLE:
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Double", "valueOf", "(D)Ljava/lang/Double;");
break;
}
mv.visitInsn(ARETURN);
}
mv.visitLabel(defaultLabel);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
}
mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
mv.visitInsn(DUP);
mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
mv.visitInsn(DUP);
mv.visitLdcInsn("Method not found: ");
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V");
mv.visitVarInsn(ILOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(I)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>", "(Ljava/lang/String;)V");
mv.visitInsn(ATHROW);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
byte[] data = cw.toByteArray();
accessClass = loader.defineClass(accessClassName, data);
}
try {
MethodAccess access = (MethodAccess)accessClass.newInstance();
access.methods = methods.toArray(new Method[methods.size()]);
return access;
} catch (Exception ex) {
throw new RuntimeException("Error constructing method access class: " + accessClassName, ex);
}
}
private Method[] methods;
abstract public Object invoke (Object object, int methodIndex, Object... args);
/** Invokes the first method with the specified name. */
public Object invoke (Object object, String methodName, Object... args) {
return invoke(object, getIndex(methodName), args);
}
/** Returns the index of the first method with the specified name. */
public int getIndex (String methodName) {
for (int i = 0, n = methods.length; i < n; i++) {
Method method = methods[i];
if (method.getName().equals(methodName)) return i;
}
throw new IllegalArgumentException("Unable to find public method: " + methodName);
}
public int getIndex (String methodName, Class... parameterTypes) {
for (int i = 0, n = methods.length; i < n; i++) {
Method method = methods[i];
if (method.getName().equals(methodName) && Arrays.equals(parameterTypes, method.getParameterTypes())) return i;
}
throw new IllegalArgumentException("Unable to find public method: " + methodName + " " + Arrays.toString(parameterTypes));
}
public Method[] getMethods () {
return methods;
}
}