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/*
* Copyright 2003,2004 The Apache Software Foundation
*
* Licensed 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.snapscript.cglib.reflect;
import java.lang.reflect.*;
import java.util.*;
import org.snapscript.asm.ClassVisitor;
import org.snapscript.asm.Label;
import org.snapscript.asm.Type;
import org.snapscript.cglib.core.*;
class FastClassEmitter extends ClassEmitter {
private static final Signature CSTRUCT_CLASS =
TypeUtils.parseConstructor("Class");
private static final Signature METHOD_GET_INDEX =
TypeUtils.parseSignature("int getIndex(String, Class[])");
private static final Signature SIGNATURE_GET_INDEX =
new Signature("getIndex", Type.INT_TYPE, new Type[]{ Constants.TYPE_SIGNATURE });
private static final Signature TO_STRING =
TypeUtils.parseSignature("String toString()");
private static final Signature CONSTRUCTOR_GET_INDEX =
TypeUtils.parseSignature("int getIndex(Class[])");
private static final Signature INVOKE =
TypeUtils.parseSignature("Object invoke(int, Object, Object[])");
private static final Signature NEW_INSTANCE =
TypeUtils.parseSignature("Object newInstance(int, Object[])");
private static final Signature GET_MAX_INDEX =
TypeUtils.parseSignature("int getMaxIndex()");
private static final Signature GET_SIGNATURE_WITHOUT_RETURN_TYPE =
TypeUtils.parseSignature("String getSignatureWithoutReturnType(String, Class[])");
private static final Type FAST_CLASS =
TypeUtils.parseType("org.snapscript.cglib.reflect.FastClass");
private static final Type ILLEGAL_ARGUMENT_EXCEPTION =
TypeUtils.parseType("IllegalArgumentException");
private static final Type INVOCATION_TARGET_EXCEPTION =
TypeUtils.parseType("java.lang.reflect.InvocationTargetException");
private static final Type[] INVOCATION_TARGET_EXCEPTION_ARRAY = { INVOCATION_TARGET_EXCEPTION };
public FastClassEmitter(ClassVisitor v, String className, Class type) {
super(v);
Type base = Type.getType(type);
begin_class(Constants.V1_2, Constants.ACC_PUBLIC, className, FAST_CLASS, null, Constants.SOURCE_FILE);
// constructor
CodeEmitter e = begin_method(Constants.ACC_PUBLIC, CSTRUCT_CLASS, null);
e.load_this();
e.load_args();
e.super_invoke_constructor(CSTRUCT_CLASS);
e.return_value();
e.end_method();
VisibilityPredicate vp = new VisibilityPredicate(type, false);
List methods = ReflectUtils.addAllMethods(type, new ArrayList());
CollectionUtils.filter(methods, vp);
CollectionUtils.filter(methods, new DuplicatesPredicate());
List constructors = new ArrayList(Arrays.asList(type.getDeclaredConstructors()));
CollectionUtils.filter(constructors, vp);
// getIndex(String)
emitIndexBySignature(methods);
// getIndex(String, Class[])
emitIndexByClassArray(methods);
// getIndex(Class[])
e = begin_method(Constants.ACC_PUBLIC, CONSTRUCTOR_GET_INDEX, null);
e.load_args();
List info = CollectionUtils.transform(constructors, MethodInfoTransformer.getInstance());
EmitUtils.constructor_switch(e, info, new GetIndexCallback(e, info));
e.end_method();
// invoke(int, Object, Object[])
e = begin_method(Constants.ACC_PUBLIC, INVOKE, INVOCATION_TARGET_EXCEPTION_ARRAY);
e.load_arg(1);
e.checkcast(base);
e.load_arg(0);
invokeSwitchHelper(e, methods, 2, base);
e.end_method();
// newInstance(int, Object[])
e = begin_method(Constants.ACC_PUBLIC, NEW_INSTANCE, INVOCATION_TARGET_EXCEPTION_ARRAY);
e.new_instance(base);
e.dup();
e.load_arg(0);
invokeSwitchHelper(e, constructors, 1, base);
e.end_method();
// getMaxIndex()
e = begin_method(Constants.ACC_PUBLIC, GET_MAX_INDEX, null);
e.push(methods.size() - 1);
e.return_value();
e.end_method();
end_class();
}
// TODO: support constructor indices ("")
private void emitIndexBySignature(List methods) {
CodeEmitter e = begin_method(Constants.ACC_PUBLIC, SIGNATURE_GET_INDEX, null);
List signatures = CollectionUtils.transform(methods, new Transformer() {
public Object transform(Object obj) {
return ReflectUtils.getSignature((Method)obj).toString();
}
});
e.load_arg(0);
e.invoke_virtual(Constants.TYPE_OBJECT, TO_STRING);
signatureSwitchHelper(e, signatures);
e.end_method();
}
private static final int TOO_MANY_METHODS = 100; // TODO
private void emitIndexByClassArray(List methods) {
CodeEmitter e = begin_method(Constants.ACC_PUBLIC, METHOD_GET_INDEX, null);
if (methods.size() > TOO_MANY_METHODS) {
// hack for big classes
List signatures = CollectionUtils.transform(methods, new Transformer() {
public Object transform(Object obj) {
String s = ReflectUtils.getSignature((Method)obj).toString();
return s.substring(0, s.lastIndexOf(')') + 1);
}
});
e.load_args();
e.invoke_static(FAST_CLASS, GET_SIGNATURE_WITHOUT_RETURN_TYPE);
signatureSwitchHelper(e, signatures);
} else {
e.load_args();
List info = CollectionUtils.transform(methods, MethodInfoTransformer.getInstance());
EmitUtils.method_switch(e, info, new GetIndexCallback(e, info));
}
e.end_method();
}
private void signatureSwitchHelper(final CodeEmitter e, final List signatures) {
ObjectSwitchCallback callback = new ObjectSwitchCallback() {
public void processCase(Object key, Label end) {
// TODO: remove linear indexOf
e.push(signatures.indexOf(key));
e.return_value();
}
public void processDefault() {
e.push(-1);
e.return_value();
}
};
EmitUtils.string_switch(e,
(String[])signatures.toArray(new String[signatures.size()]),
Constants.SWITCH_STYLE_HASH,
callback);
}
private static void invokeSwitchHelper(final CodeEmitter e, List members, final int arg, final Type base) {
final List info = CollectionUtils.transform(members, MethodInfoTransformer.getInstance());
final Label illegalArg = e.make_label();
Block block = e.begin_block();
e.process_switch(getIntRange(info.size()), new ProcessSwitchCallback() {
public void processCase(int key, Label end) {
MethodInfo method = (MethodInfo)info.get(key);
Type[] types = method.getSignature().getArgumentTypes();
for (int i = 0; i < types.length; i++) {
e.load_arg(arg);
e.aaload(i);
e.unbox(types[i]);
}
// TODO: change method lookup process so MethodInfo will already reference base
// instead of superclass when superclass method is inaccessible
e.invoke(method, base);
if (!TypeUtils.isConstructor(method)) {
e.box(method.getSignature().getReturnType());
}
e.return_value();
}
public void processDefault() {
e.goTo(illegalArg);
}
});
block.end();
EmitUtils.wrap_throwable(block, INVOCATION_TARGET_EXCEPTION);
e.mark(illegalArg);
e.throw_exception(ILLEGAL_ARGUMENT_EXCEPTION, "Cannot find matching method/constructor");
}
private static class GetIndexCallback implements ObjectSwitchCallback {
private CodeEmitter e;
private Map indexes = new HashMap();
public GetIndexCallback(CodeEmitter e, List methods) {
this.e = e;
int index = 0;
for (Iterator it = methods.iterator(); it.hasNext();) {
indexes.put(it.next(), new Integer(index++));
}
}
public void processCase(Object key, Label end) {
e.push(((Integer)indexes.get(key)).intValue());
e.return_value();
}
public void processDefault() {
e.push(-1);
e.return_value();
}
}
private static int[] getIntRange(int length) {
int[] range = new int[length];
for (int i = 0; i < length; i++) {
range[i] = i;
}
return range;
}
}
