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Groovy: A powerful, dynamic language for the JVM
/*
* 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.codehaus.groovy.tools;
import org.codehaus.groovy.classgen.asm.BytecodeHelper;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.CachedMethod;
import org.codehaus.groovy.reflection.GeneratedMetaMethod;
import org.codehaus.groovy.reflection.ReflectionCache;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class DgmConverter implements Opcodes {
public static void main(String[] args) throws IOException {
String targetDirectory = "target/classes/";
boolean info = (args.length == 1 && args[0].equals("--info"))
|| (args.length==2 && args[0].equals("--info"));
if (info && args.length==2) {
targetDirectory = args[1];
if (!targetDirectory.endsWith("/")) targetDirectory += "/";
}
List cachedMethodsList = new ArrayList();
for (Class aClass : DefaultGroovyMethods.DGM_LIKE_CLASSES) {
Collections.addAll(cachedMethodsList, ReflectionCache.getCachedClass(aClass).getMethods());
}
final CachedMethod[] cachedMethods = cachedMethodsList.toArray(new CachedMethod[cachedMethodsList.size()]);
List records = new ArrayList();
int cur = 0;
for (CachedMethod method : cachedMethods) {
if (!method.isStatic() || !method.isPublic())
continue;
if (method.getCachedMethod().getAnnotation(Deprecated.class) != null)
continue;
if (method.getParameterTypes().length == 0)
continue;
final Class returnType = method.getReturnType();
final String className = "org/codehaus/groovy/runtime/dgm$" + cur++;
GeneratedMetaMethod.DgmMethodRecord record = new GeneratedMetaMethod.DgmMethodRecord();
records.add(record);
record.methodName = method.getName();
record.returnType = method.getReturnType();
record.parameters = method.getNativeParameterTypes();
record.className = className;
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
cw.visit(V1_3, ACC_PUBLIC, className, null, "org/codehaus/groovy/reflection/GeneratedMetaMethod", null);
createConstructor(cw);
final String methodDescriptor = BytecodeHelper.getMethodDescriptor(returnType, method.getNativeParameterTypes());
createInvokeMethod(method, cw, returnType, methodDescriptor);
createDoMethodInvokeMethod(method, cw, className, returnType, methodDescriptor);
createIsValidMethodMethod(method, cw, className);
cw.visitEnd();
final byte[] bytes = cw.toByteArray();
final FileOutputStream fileOutputStream = new FileOutputStream(targetDirectory + className + ".class");
fileOutputStream.write(bytes);
fileOutputStream.flush();
fileOutputStream.close();
}
GeneratedMetaMethod.DgmMethodRecord.saveDgmInfo(records, targetDirectory+"/META-INF/dgminfo");
if (info)
System.out.println("Saved " + cur + " dgm records to: "+targetDirectory+"/META-INF/dgminfo");
}
private static void createConstructor(ClassWriter cw) {
MethodVisitor mv;
mv = cw.visitMethod(ACC_PUBLIC, "", "(Ljava/lang/String;Lorg/codehaus/groovy/reflection/CachedClass;Ljava/lang/Class;[Ljava/lang/Class;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ALOAD, 4);
mv.visitMethodInsn(INVOKESPECIAL, "org/codehaus/groovy/reflection/GeneratedMetaMethod", "", "(Ljava/lang/String;Lorg/codehaus/groovy/reflection/CachedClass;Ljava/lang/Class;[Ljava/lang/Class;)V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private static void createIsValidMethodMethod(CachedMethod method, ClassWriter cw, String className) {
MethodVisitor mv;
if (method.getParamsCount() == 2 && method.getParameterTypes()[0].isNumber && method.getParameterTypes()[1].isNumber) {
// 1 param meta method
mv = cw.visitMethod(ACC_PUBLIC, "isValidMethod", "([Ljava/lang/Class;)Z", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 1);
Label l0 = new Label();
mv.visitJumpInsn(IFNULL, l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, className, "getParameterTypes", "()[Lorg/codehaus/groovy/reflection/CachedClass;", false);
mv.visitInsn(ICONST_0);
mv.visitInsn(AALOAD);
mv.visitVarInsn(ALOAD, 1);
mv.visitInsn(ICONST_0);
mv.visitInsn(AALOAD);
mv.visitMethodInsn(INVOKEVIRTUAL, "org/codehaus/groovy/reflection/CachedClass", "isAssignableFrom", "(Ljava/lang/Class;)Z", false);
Label l1 = new Label();
mv.visitJumpInsn(IFEQ, l1);
mv.visitLabel(l0);
mv.visitInsn(ICONST_1);
Label l2 = new Label();
mv.visitJumpInsn(GOTO, l2);
mv.visitLabel(l1);
mv.visitInsn(ICONST_0);
mv.visitLabel(l2);
mv.visitInsn(IRETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
}
private static void createDoMethodInvokeMethod(CachedMethod method, ClassWriter cw, String className, Class returnType, String methodDescriptor) {
MethodVisitor mv;
mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "doMethodInvoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", null, null);
mv.visitCode();
if (method.getParamsCount() == 2 && method.getParameterTypes()[0].isNumber && method.getParameterTypes()[1].isNumber) {
mv.visitVarInsn(ALOAD, 1);
BytecodeHelper.doCast(mv, method.getParameterTypes()[0].getTheClass());
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, className, "getParameterTypes", "()[Lorg/codehaus/groovy/reflection/CachedClass;", false);
mv.visitInsn(ICONST_0);
mv.visitInsn(AALOAD);
mv.visitVarInsn(ALOAD, 2);
mv.visitInsn(ICONST_0);
mv.visitInsn(AALOAD);
mv.visitMethodInsn(INVOKEVIRTUAL, "org/codehaus/groovy/reflection/CachedClass", "coerceArgument", "(Ljava/lang/Object;)Ljava/lang/Object;", false);
// cast argument to parameter class, inclusive unboxing
// for methods with primitive types
Class type = method.getParameterTypes()[1].getTheClass();
BytecodeHelper.doCast(mv, type);
} else {
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, className, "coerceArgumentsToClasses", "([Ljava/lang/Object;)[Ljava/lang/Object;", false);
mv.visitVarInsn(ASTORE, 2);
mv.visitVarInsn(ALOAD, 1);
BytecodeHelper.doCast(mv, method.getParameterTypes()[0].getTheClass());
loadParameters(method, 2, mv);
}
mv.visitMethodInsn(INVOKESTATIC, BytecodeHelper.getClassInternalName(method.getDeclaringClass().getTheClass()), method.getName(), methodDescriptor, false);
BytecodeHelper.box(mv, returnType);
if (method.getReturnType() == void.class) {
mv.visitInsn(ACONST_NULL);
}
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private static void createInvokeMethod(CachedMethod method, ClassWriter cw, Class returnType, String methodDescriptor) {
MethodVisitor mv;
mv = cw.visitMethod(ACC_PUBLIC, "invoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 1);
BytecodeHelper.doCast(mv, method.getParameterTypes()[0].getTheClass());
loadParameters(method, 2, mv);
mv.visitMethodInsn(INVOKESTATIC, BytecodeHelper.getClassInternalName(method.getDeclaringClass().getTheClass()), method.getName(), methodDescriptor, false);
BytecodeHelper.box(mv, returnType);
if (method.getReturnType() == void.class) {
mv.visitInsn(ACONST_NULL);
}
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
protected static void loadParameters(CachedMethod method, int argumentIndex, MethodVisitor mv) {
CachedClass[] parameters = method.getParameterTypes();
int size = parameters.length - 1;
for (int i = 0; i < size; i++) {
// unpack argument from Object[]
mv.visitVarInsn(ALOAD, argumentIndex);
BytecodeHelper.pushConstant(mv, i);
mv.visitInsn(AALOAD);
// cast argument to parameter class, inclusive unboxing
// for methods with primitive types
Class type = parameters[i + 1].getTheClass();
BytecodeHelper.doCast(mv, type);
}
}
}