1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.nashorn.internal.tools.nasgen; 27 28 import static jdk.internal.org.objectweb.asm.Opcodes.ACC_FINAL; 29 import static jdk.internal.org.objectweb.asm.Opcodes.ACC_PUBLIC; 30 import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESTATIC; 31 import static jdk.internal.org.objectweb.asm.Opcodes.V1_7; 32 import static jdk.nashorn.internal.tools.nasgen.StringConstants.CONSTRUCTOR_SUFFIX; 33 import static jdk.nashorn.internal.tools.nasgen.StringConstants.DEFAULT_INIT_DESC; 34 import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT; 35 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC; 36 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE; 37 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE_DESC; 38 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME; 39 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_TYPE; 40 import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC; 41 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR; 42 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC; 43 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_TYPE; 44 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_INIT_DESC3; 45 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_INIT_DESC4; 46 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_TYPE; 47 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY; 48 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY_DESC; 49 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE; 50 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE_DESC; 51 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_TYPE; 52 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_INIT_DESC; 53 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_TYPE; 54 55 import java.io.FileOutputStream; 56 import java.io.IOException; 57 import java.util.List; 58 import jdk.internal.org.objectweb.asm.Handle; 59 60 /** 61 * This class generates constructor class for a @ClassInfo annotated class. 62 * 63 */ 64 public class ConstructorGenerator extends ClassGenerator { 65 private final ScriptClassInfo scriptClassInfo; 66 private final String className; 67 private final MemberInfo constructor; 68 private final int memberCount; 69 private final List<MemberInfo> specs; 70 71 ConstructorGenerator(final ScriptClassInfo sci) { 72 this.scriptClassInfo = sci; 73 74 this.className = scriptClassInfo.getConstructorClassName(); 75 this.constructor = scriptClassInfo.getConstructor(); 76 this.memberCount = scriptClassInfo.getConstructorMemberCount(); 77 this.specs = scriptClassInfo.getSpecializedConstructors(); 78 } 79 80 byte[] getClassBytes() { 81 // new class extensing from ScriptObject 82 final String superClass = (constructor != null)? SCRIPTFUNCTIONIMPL_TYPE : SCRIPTOBJECT_TYPE; 83 cw.visit(V1_7, ACC_FINAL, className, null, superClass, null); 84 if (memberCount > 0) { 85 // add fields 86 emitFields(); 87 // add <clinit> 88 emitStaticInitializer(); 89 } 90 // add <init> 91 emitConstructor(); 92 93 if (constructor == null) { 94 emitGetClassName(scriptClassInfo.getName()); 95 } 96 97 cw.visitEnd(); 98 return cw.toByteArray(); 99 } 100 101 // --Internals only below this point 102 private void emitFields() { 103 // Introduce "Function" type instance fields for each 104 // constructor @Function in script class and introduce instance 105 // fields for each constructor @Property in the script class. 106 for (MemberInfo memInfo : scriptClassInfo.getMembers()) { 107 if (memInfo.isConstructorFunction()) { 108 addFunctionField(memInfo.getJavaName()); 109 memInfo = (MemberInfo)memInfo.clone(); 110 memInfo.setJavaDesc(OBJECT_DESC); 111 memInfo.setJavaAccess(ACC_PUBLIC); 112 addGetter(className, memInfo); 113 addSetter(className, memInfo); 114 } else if (memInfo.isConstructorProperty()) { 115 if (memInfo.isStaticFinal()) { 116 addGetter(scriptClassInfo.getJavaName(), memInfo); 117 } else { 118 addField(memInfo.getJavaName(), memInfo.getJavaDesc()); 119 memInfo = (MemberInfo)memInfo.clone(); 120 memInfo.setJavaAccess(ACC_PUBLIC); 121 addGetter(className, memInfo); 122 addSetter(className, memInfo); 123 } 124 } 125 } 126 127 addMapField(); 128 } 129 130 private void emitStaticInitializer() { 131 final MethodGenerator mi = makeStaticInitializer(); 132 emitStaticInitPrefix(mi, className, memberCount); 133 134 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 135 if (memInfo.isConstructorFunction() || memInfo.isConstructorProperty()) { 136 linkerAddGetterSetter(mi, className, memInfo); 137 } else if (memInfo.isConstructorGetter()) { 138 final MemberInfo setter = scriptClassInfo.findSetter(memInfo); 139 linkerAddGetterSetter(mi, scriptClassInfo.getJavaName(), memInfo, setter); 140 } 141 } 142 emitStaticInitSuffix(mi, className); 143 } 144 145 private void emitConstructor() { 146 final MethodGenerator mi = makeConstructor(); 147 mi.visitCode(); 148 callSuper(mi); 149 150 if (memberCount > 0) { 151 // initialize Function type fields 152 initFunctionFields(mi); 153 // initialize data fields 154 initDataFields(mi); 155 } 156 157 if (constructor != null) { 158 final int arity = constructor.getArity(); 159 if (arity != MemberInfo.DEFAULT_ARITY) { 160 mi.loadThis(); 161 mi.push(arity); 162 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETARITY, 163 SCRIPTFUNCTION_SETARITY_DESC); 164 } 165 } 166 mi.returnVoid(); 167 mi.computeMaxs(); 168 mi.visitEnd(); 169 } 170 171 private void loadMap(final MethodGenerator mi) { 172 if (memberCount > 0) { 173 mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC); 174 // make sure we use duplicated PropertyMap so that original map 175 // stays intact and so can be used for many globals. 176 mi.invokeVirtual(PROPERTYMAP_TYPE, PROPERTYMAP_DUPLICATE, PROPERTYMAP_DUPLICATE_DESC); 177 } 178 } 179 180 private void callSuper(final MethodGenerator mi) { 181 String superClass, superDesc; 182 mi.loadThis(); 183 if (constructor == null) { 184 // call ScriptObject.<init> 185 superClass = SCRIPTOBJECT_TYPE; 186 superDesc = (memberCount > 0) ? SCRIPTOBJECT_INIT_DESC : DEFAULT_INIT_DESC; 187 loadMap(mi); 188 } else { 189 // call Function.<init> 190 superClass = SCRIPTFUNCTIONIMPL_TYPE; 191 superDesc = (memberCount > 0) ? SCRIPTFUNCTIONIMPL_INIT_DESC4 : SCRIPTFUNCTIONIMPL_INIT_DESC3; 192 mi.loadLiteral(constructor.getName()); 193 mi.visitLdcInsn(new Handle(H_INVOKESTATIC, scriptClassInfo.getJavaName(), constructor.getJavaName(), constructor.getJavaDesc())); 194 loadMap(mi); 195 mi.memberInfoArray(scriptClassInfo.getJavaName(), specs); //pushes null if specs empty 196 } 197 198 mi.invokeSpecial(superClass, INIT, superDesc); 199 } 200 201 private void initFunctionFields(final MethodGenerator mi) { 202 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 203 if (!memInfo.isConstructorFunction()) { 204 continue; 205 } 206 mi.loadThis(); 207 newFunction(mi, scriptClassInfo.getJavaName(), memInfo, scriptClassInfo.findSpecializations(memInfo.getJavaName())); 208 mi.putField(className, memInfo.getJavaName(), OBJECT_DESC); 209 } 210 } 211 212 private void initDataFields(final MethodGenerator mi) { 213 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 214 if (!memInfo.isConstructorProperty() || memInfo.isFinal()) { 215 continue; 216 } 217 final Object value = memInfo.getValue(); 218 if (value != null) { 219 mi.loadThis(); 220 mi.loadLiteral(value); 221 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 222 } else if (!memInfo.getInitClass().isEmpty()) { 223 final String clazz = memInfo.getInitClass(); 224 mi.loadThis(); 225 mi.newObject(clazz); 226 mi.dup(); 227 mi.invokeSpecial(clazz, INIT, DEFAULT_INIT_DESC); 228 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 229 } 230 } 231 232 if (constructor != null) { 233 mi.loadThis(); 234 final String protoName = scriptClassInfo.getPrototypeClassName(); 235 mi.newObject(protoName); 236 mi.dup(); 237 mi.invokeSpecial(protoName, INIT, DEFAULT_INIT_DESC); 238 mi.dup(); 239 mi.loadThis(); 240 mi.invokeStatic(PROTOTYPEOBJECT_TYPE, PROTOTYPEOBJECT_SETCONSTRUCTOR, 241 PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC); 242 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETPROTOTYPE, SCRIPTFUNCTION_SETPROTOTYPE_DESC); 243 } 244 } 245 246 /** 247 * Entry point for ConstructorGenerator run separately as an application. Will display 248 * usage. Takes one argument, a class name. 249 * @param args args vector 250 * @throws IOException if class can't be read 251 */ 252 public static void main(final String[] args) throws IOException { 253 if (args.length != 1) { 254 System.err.println("Usage: " + ConstructorGenerator.class.getName() + " <class>"); 255 System.exit(1); 256 } 257 258 final String className = args[0].replace('.', '/'); 259 final ScriptClassInfo sci = getScriptClassInfo(className + ".class"); 260 if (sci == null) { 261 System.err.println("No @ScriptClass in " + className); 262 System.exit(2); 263 throw new IOException(); // get rid of warning for sci.verify() below - may be null 264 } 265 266 try { 267 sci.verify(); 268 } catch (final Exception e) { 269 System.err.println(e.getMessage()); 270 System.exit(3); 271 } 272 final ConstructorGenerator gen = new ConstructorGenerator(sci); 273 try (FileOutputStream fos = new FileOutputStream(className + CONSTRUCTOR_SUFFIX + ".class")) { 274 fos.write(gen.getClassBytes()); 275 } 276 } 277 }