001 /* 002 $Id: ReflectorGenerator.java,v 1.9 2005/05/27 10:13:09 russel Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package org.codehaus.groovy.classgen; 047 048 import groovy.lang.MetaMethod; 049 050 import java.util.List; 051 052 import org.objectweb.asm.ClassVisitor; 053 import org.objectweb.asm.MethodVisitor; 054 import org.objectweb.asm.Opcodes; 055 import org.objectweb.asm.Label; 056 057 /** 058 * Code generates a Reflector 059 * 060 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 061 * @version $Revision: 1.9 $ 062 */ 063 public class ReflectorGenerator implements Opcodes { 064 065 private List methods; 066 private ClassVisitor cw; 067 private MethodVisitor cv; 068 private BytecodeHelper helper = new BytecodeHelper(null); 069 private String classInternalName; 070 071 public ReflectorGenerator(List methods) { 072 this.methods = methods; 073 } 074 075 public void generate(ClassVisitor cw, String className) { 076 this.cw = cw; 077 078 classInternalName = BytecodeHelper.getClassInternalName(className); 079 cw.visit(ClassGenerator.asmJDKVersion, ACC_PUBLIC + ACC_SUPER, classInternalName, (String)null, "org/codehaus/groovy/runtime/Reflector", null); 080 081 cv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); 082 cv.visitVarInsn(ALOAD, 0); 083 cv.visitMethodInsn(INVOKESPECIAL, "org/codehaus/groovy/runtime/Reflector", "<init>", "()V"); 084 cv.visitInsn(RETURN); 085 cv.visitMaxs(1, 1); 086 087 generateInvokeMethod(); 088 089 cw.visitEnd(); 090 } 091 092 protected void generateInvokeMethod() { 093 int methodCount = methods.size(); 094 095 cv = 096 cw.visitMethod( 097 ACC_PUBLIC, 098 "invoke", 099 "(Lgroovy/lang/MetaMethod;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", 100 null, 101 null); 102 helper = new BytecodeHelper(cv); 103 104 cv.visitVarInsn(ALOAD, 1); 105 cv.visitMethodInsn(INVOKEVIRTUAL, "groovy/lang/MetaMethod", "getMethodIndex", "()I"); 106 Label defaultLabel = new Label(); 107 Label[] labels = new Label[methodCount]; 108 int[] indices = new int[methodCount]; 109 for (int i = 0; i < methodCount; i++) { 110 labels[i] = new Label(); 111 112 MetaMethod method = (MetaMethod) methods.get(i); 113 method.setMethodIndex(i + 1); 114 indices[i] = method.getMethodIndex(); 115 116 //System.out.println("Index: " + method.getMethodIndex() + " for: " + method); 117 } 118 119 cv.visitLookupSwitchInsn(defaultLabel, indices, labels); 120 //cv.visitTableSwitchInsn(minMethodIndex, maxMethodIndex, defaultLabel, labels); 121 122 for (int i = 0; i < methodCount; i++) { 123 cv.visitLabel(labels[i]); 124 125 MetaMethod method = (MetaMethod) methods.get(i); 126 invokeMethod(method); 127 if (method.getReturnType() == void.class) { 128 cv.visitInsn(ACONST_NULL); 129 } 130 cv.visitInsn(ARETURN); 131 } 132 133 cv.visitLabel(defaultLabel); 134 cv.visitVarInsn(ALOAD, 0); 135 cv.visitVarInsn(ALOAD, 1); 136 cv.visitVarInsn(ALOAD, 2); 137 cv.visitVarInsn(ALOAD, 3); 138 cv.visitMethodInsn( 139 INVOKEVIRTUAL, 140 classInternalName, 141 "noSuchMethod", 142 "(Lgroovy/lang/MetaMethod;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;"); 143 cv.visitInsn(ARETURN); 144 cv.visitMaxs(4, 4); 145 } 146 147 protected void invokeMethod(MetaMethod method) { 148 /** simple 149 cv.visitVarInsn(ALOAD, 2); 150 cv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;"); 151 */ 152 Class ownerClass = method.getInterfaceClass(); 153 boolean useInterface = false; 154 if (ownerClass == null) { 155 ownerClass = method.getDeclaringClass(); 156 } 157 else { 158 useInterface = true; 159 } 160 String type = BytecodeHelper.getClassInternalName(ownerClass.getName()); 161 String descriptor = BytecodeHelper.getMethodDescriptor(method.getReturnType(), method.getParameterTypes()); 162 163 // System.out.println("Method: " + method); 164 // System.out.println("Descriptor: " + descriptor); 165 166 if (method.isStatic()) { 167 loadParameters(method, 3); 168 cv.visitMethodInsn(INVOKESTATIC, type, method.getName(), descriptor); 169 } 170 else { 171 cv.visitVarInsn(ALOAD, 2); 172 helper.doCast(ownerClass); 173 loadParameters(method, 3); 174 cv.visitMethodInsn((useInterface) ? INVOKEINTERFACE : INVOKEVIRTUAL, type, method.getName(), descriptor); 175 } 176 177 helper.box(method.getReturnType()); 178 } 179 180 /* 181 protected void generateInvokeSuperMethod() { 182 List superMethods = new ArrayList(methods); 183 for (Iterator iter = methods.iterator(); iter.hasNext();) { 184 MetaMethod method = (MetaMethod) iter.next(); 185 if (!validSuperMethod(method)) { 186 superMethods.remove(method); 187 } 188 } 189 int methodCount = superMethods.size(); 190 if (methodCount == 0) { 191 return; 192 } 193 cv = 194 cw.visitMethod( 195 ACC_PUBLIC, 196 "invokeSuper", 197 "(Lgroovy/lang/MetaMethod;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", 198 null, 199 null); 200 helper = new BytecodeHelper(cv); 201 202 cv.visitVarInsn(ALOAD, 1); 203 cv.visitMethodInsn(INVOKEVIRTUAL, "groovy/lang/MetaMethod", "getMethodIndex", "()I"); 204 Label defaultLabel = new Label(); 205 Label[] labels = new Label[methodCount]; 206 int[] indices = new int[methodCount]; 207 for (int i = 0; i < methodCount; i++) { 208 labels[i] = new Label(); 209 210 MetaMethod method = (MetaMethod) superMethods.get(i); 211 method.setMethodIndex(i + 1); 212 indices[i] = method.getMethodIndex(); 213 214 //System.out.println("Index: " + method.getMethodIndex() + " for: " + method); 215 } 216 217 cv.visitLookupSwitchInsn(defaultLabel, indices, labels); 218 //cv.visitTableSwitchInsn(minMethodIndex, maxMethodIndex, defaultLabel, labels); 219 220 for (int i = 0; i < methodCount; i++) { 221 MetaMethod method = (MetaMethod) superMethods.get(i); 222 cv.visitLabel(labels[i]); 223 224 invokeSuperMethod(method); 225 if (method.getReturnType() == void.class) { 226 cv.visitInsn(ACONST_NULL); 227 } 228 cv.visitInsn(ARETURN); 229 } 230 231 cv.visitLabel(defaultLabel); 232 cv.visitVarInsn(ALOAD, 0); 233 cv.visitVarInsn(ALOAD, 1); 234 cv.visitVarInsn(ALOAD, 2); 235 cv.visitVarInsn(ALOAD, 3); 236 cv.visitMethodInsn( 237 INVOKEVIRTUAL, 238 classInternalName, 239 "noSuchMethod", 240 "(Lgroovy/lang/MetaMethod;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;"); 241 cv.visitInsn(ARETURN); 242 cv.visitMaxs(4, 4); 243 } 244 245 protected boolean validSuperMethod(MetaMethod method) { 246 return !method.isStatic() && (method.getModifiers() & (Modifier.FINAL | Modifier.ABSTRACT)) == 0 && theClass == method.getDeclaringClass(); 247 } 248 249 protected void invokeSuperMethod(MetaMethod method) { 250 Class ownerClass = method.getDeclaringClass(); 251 String type = helper.getClassInternalName(ownerClass.getName()); 252 String descriptor = helper.getMethodDescriptor(method.getReturnType(), method.getParameterTypes()); 253 254 // System.out.println("Method: " + method.getName()); 255 // System.out.println("Descriptor: " + descriptor); 256 257 cv.visitVarInsn(ALOAD, 2); 258 //helper.doCast(ownerClass); 259 loadParameters(method, 3); 260 cv.visitMethodInsn(INVOKESPECIAL, type, method.getName(), descriptor); 261 262 helper.box(method.getReturnType()); 263 } 264 */ 265 266 protected void loadParameters(MetaMethod method, int argumentIndex) { 267 Class[] parameters = method.getParameterTypes(); 268 int size = parameters.length; 269 for (int i = 0; i < size; i++) { 270 cv.visitVarInsn(ALOAD, argumentIndex); 271 helper.pushConstant(i); 272 cv.visitInsn(AALOAD); 273 274 // we should cast to something 275 Class type = parameters[i]; 276 if (type.isPrimitive()) { 277 helper.unbox(type); 278 } 279 else { 280 helper.doCast(type.getName()); 281 } 282 } 283 } 284 }