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.OBJECT_DESC; 36 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC; 37 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME; 38 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR; 39 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC; 40 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_TYPE; 41 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_INIT_DESC3; 42 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_INIT_DESC4; 43 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY; 44 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY_DESC; 45 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETDOCUMENTATION; 46 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETDOCUMENTATION_DESC; 47 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE; 48 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE_DESC; 49 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_TYPE; 50 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_INIT_DESC; 51 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_TYPE; 52 53 import java.io.FileOutputStream; 54 import java.io.IOException; 55 import java.util.List; 56 import jdk.internal.org.objectweb.asm.Handle; 57 58 /** 59 * This class generates constructor class for a @ScriptClass annotated class. 60 * 61 */ 62 public class ConstructorGenerator extends ClassGenerator { 63 private final ScriptClassInfo scriptClassInfo; 64 private final String className; 65 private final MemberInfo constructor; 66 private final int memberCount; 67 private final List<MemberInfo> specs; 68 69 ConstructorGenerator(final ScriptClassInfo sci) { 70 this.scriptClassInfo = sci; 71 72 this.className = scriptClassInfo.getConstructorClassName(); 73 this.constructor = scriptClassInfo.getConstructor(); 74 this.memberCount = scriptClassInfo.getConstructorMemberCount(); 75 this.specs = scriptClassInfo.getSpecializedConstructors(); 76 } 77 78 byte[] getClassBytes() { 79 // new class extending from ScriptObject 80 final String superClass = (constructor != null)? SCRIPTFUNCTION_TYPE : SCRIPTOBJECT_TYPE; 81 cw.visit(V1_7, ACC_FINAL, className, null, superClass, null); 82 if (memberCount > 0) { 83 // add fields 84 emitFields(); 85 // add <clinit> 86 emitStaticInitializer(); 87 } 88 // add <init> 89 emitConstructor(); 90 91 if (constructor == null) { 92 emitGetClassName(scriptClassInfo.getName()); 93 } 94 95 cw.visitEnd(); 96 return cw.toByteArray(); 97 } 98 99 // --Internals only below this point 100 private void emitFields() { 101 // Introduce "Function" type instance fields for each 102 // constructor @Function in script class and introduce instance 103 // fields for each constructor @Property in the script class. 104 for (MemberInfo memInfo : scriptClassInfo.getMembers()) { 105 if (memInfo.isConstructorFunction()) { 106 addFunctionField(memInfo.getJavaName()); 107 memInfo = (MemberInfo)memInfo.clone(); 108 memInfo.setJavaDesc(OBJECT_DESC); 109 memInfo.setJavaAccess(ACC_PUBLIC); 110 addGetter(className, memInfo); 111 addSetter(className, memInfo); 112 } else if (memInfo.isConstructorProperty()) { 113 if (memInfo.isStaticFinal()) { 114 addGetter(scriptClassInfo.getJavaName(), memInfo); 115 } else { 116 addField(memInfo.getJavaName(), memInfo.getJavaDesc()); 117 memInfo = (MemberInfo)memInfo.clone(); 118 memInfo.setJavaAccess(ACC_PUBLIC); 119 addGetter(className, memInfo); 120 addSetter(className, memInfo); 121 } 122 } 123 } 124 125 addMapField(); 126 } 127 128 private void emitStaticInitializer() { 129 final MethodGenerator mi = makeStaticInitializer(); 130 emitStaticInitPrefix(mi, className, memberCount); 131 132 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 133 if (memInfo.isConstructorFunction() || memInfo.isConstructorProperty()) { 134 linkerAddGetterSetter(mi, className, memInfo); 135 } else if (memInfo.isConstructorGetter()) { 136 final MemberInfo setter = scriptClassInfo.findSetter(memInfo); 137 linkerAddGetterSetter(mi, scriptClassInfo.getJavaName(), memInfo, setter); 138 } 139 } 140 emitStaticInitSuffix(mi, className); 141 } 142 143 private void emitConstructor() { 144 final MethodGenerator mi = makeConstructor(); 145 mi.visitCode(); 146 callSuper(mi); 147 148 if (memberCount > 0) { 149 // initialize Function type fields 150 initFunctionFields(mi); 151 // initialize data fields 152 initDataFields(mi); 153 } 154 155 if (constructor != null) { 156 initPrototype(mi); 157 final int arity = constructor.getArity(); 158 if (arity != MemberInfo.DEFAULT_ARITY) { 159 mi.loadThis(); 160 mi.push(arity); 161 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETARITY, 162 SCRIPTFUNCTION_SETARITY_DESC); 163 } 164 final String doc = constructor.getDocumentation(); 165 if (doc != null) { 166 mi.loadThis(); 167 mi.loadLiteral(doc); 168 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETDOCUMENTATION, 169 SCRIPTFUNCTION_SETDOCUMENTATION_DESC); 170 } 171 } 172 mi.returnVoid(); 173 mi.computeMaxs(); 174 mi.visitEnd(); 175 } 176 177 private void loadMap(final MethodGenerator mi) { 178 if (memberCount > 0) { 179 mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC); 180 } 181 } 182 183 private void callSuper(final MethodGenerator mi) { 184 String superClass, superDesc; 185 mi.loadThis(); 186 if (constructor == null) { 187 // call ScriptObject.<init> 188 superClass = SCRIPTOBJECT_TYPE; 189 superDesc = (memberCount > 0) ? SCRIPTOBJECT_INIT_DESC : DEFAULT_INIT_DESC; 190 loadMap(mi); 191 } else { 192 // call Function.<init> 193 superClass = SCRIPTFUNCTION_TYPE; 194 superDesc = (memberCount > 0) ? SCRIPTFUNCTION_INIT_DESC4 : SCRIPTFUNCTION_INIT_DESC3; 195 mi.loadLiteral(constructor.getName()); 196 mi.visitLdcInsn(new Handle(H_INVOKESTATIC, scriptClassInfo.getJavaName(), constructor.getJavaName(), constructor.getJavaDesc())); 197 loadMap(mi); 198 mi.memberInfoArray(scriptClassInfo.getJavaName(), specs); //pushes null if specs empty 199 } 200 201 mi.invokeSpecial(superClass, INIT, superDesc); 202 } 203 204 private void initFunctionFields(final MethodGenerator mi) { 205 assert memberCount > 0; 206 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 207 if (!memInfo.isConstructorFunction()) { 208 continue; 209 } 210 mi.loadThis(); 211 newFunction(mi, scriptClassInfo.getJavaName(), memInfo, scriptClassInfo.findSpecializations(memInfo.getJavaName())); 212 mi.putField(className, memInfo.getJavaName(), OBJECT_DESC); 213 } 214 } 215 216 private void initDataFields(final MethodGenerator mi) { 217 assert memberCount > 0; 218 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 219 if (!memInfo.isConstructorProperty() || memInfo.isFinal()) { 220 continue; 221 } 222 final Object value = memInfo.getValue(); 223 if (value != null) { 224 mi.loadThis(); 225 mi.loadLiteral(value); 226 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 227 } else if (!memInfo.getInitClass().isEmpty()) { 228 final String clazz = memInfo.getInitClass(); 229 mi.loadThis(); 230 mi.newObject(clazz); 231 mi.dup(); 232 mi.invokeSpecial(clazz, INIT, DEFAULT_INIT_DESC); 233 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 234 } 235 } 236 } 237 238 private void initPrototype(final MethodGenerator mi) { 239 assert constructor != null; 240 mi.loadThis(); 241 final String protoName = scriptClassInfo.getPrototypeClassName(); 242 mi.newObject(protoName); 243 mi.dup(); 244 mi.invokeSpecial(protoName, INIT, DEFAULT_INIT_DESC); 245 mi.dup(); 246 mi.loadThis(); 247 mi.invokeStatic(PROTOTYPEOBJECT_TYPE, PROTOTYPEOBJECT_SETCONSTRUCTOR, 248 PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC); 249 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETPROTOTYPE, SCRIPTFUNCTION_SETPROTOTYPE_DESC); 250 } 251 252 /** 253 * Entry point for ConstructorGenerator run separately as an application. Will display 254 * usage. Takes one argument, a class name. 255 * @param args args vector 256 * @throws IOException if class can't be read 257 */ 258 public static void main(final String[] args) throws IOException { 259 if (args.length != 1) { 260 System.err.println("Usage: " + ConstructorGenerator.class.getName() + " <class>"); 261 System.exit(1); 262 } 263 264 final String className = args[0].replace('.', '/'); 265 final ScriptClassInfo sci = getScriptClassInfo(className + ".class"); 266 if (sci == null) { 267 System.err.println("No @ScriptClass in " + className); 268 System.exit(2); 269 throw new IOException(); // get rid of warning for sci.verify() below - may be null 270 } 271 272 try { 273 sci.verify(); 274 } catch (final Exception e) { 275 System.err.println(e.getMessage()); 276 System.exit(3); 277 } 278 final ConstructorGenerator gen = new ConstructorGenerator(sci); 279 try (FileOutputStream fos = new FileOutputStream(className + CONSTRUCTOR_SUFFIX + ".class")) { 280 fos.write(gen.getClassBytes()); 281 } 282 } 283 }