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.SCRIPTFUNCTIONIMPL_INIT_DESC3; 42 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_INIT_DESC4; 43 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_TYPE; 44 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY; 45 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETARITY_DESC; 46 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE; 47 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETPROTOTYPE_DESC; 48 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_TYPE; 49 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_INIT_DESC; 50 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_TYPE; 51 52 import java.io.FileOutputStream; 53 import java.io.IOException; 54 import java.util.List; 55 import jdk.internal.org.objectweb.asm.Handle; 56 57 /** 58 * This class generates constructor class for a @ClassInfo annotated class. 59 * 60 */ 61 public class ConstructorGenerator extends ClassGenerator { 62 private final ScriptClassInfo scriptClassInfo; 63 private final String className; 64 private final MemberInfo constructor; 65 private final int memberCount; 66 private final List<MemberInfo> specs; 67 68 ConstructorGenerator(final ScriptClassInfo sci) { 69 this.scriptClassInfo = sci; 70 71 this.className = scriptClassInfo.getConstructorClassName(); 72 this.constructor = scriptClassInfo.getConstructor(); 73 this.memberCount = scriptClassInfo.getConstructorMemberCount(); 74 this.specs = scriptClassInfo.getSpecializedConstructors(); 75 } 76 77 byte[] getClassBytes() { 78 // new class extensing from ScriptObject 79 final String superClass = (constructor != null)? SCRIPTFUNCTIONIMPL_TYPE : SCRIPTOBJECT_TYPE; 80 cw.visit(V1_7, ACC_FINAL, className, null, superClass, null); 81 if (memberCount > 0) { 82 // add fields 83 emitFields(); 84 // add <clinit> 85 emitStaticInitializer(); 86 } 87 // add <init> 88 emitConstructor(); 89 90 if (constructor == null) { 91 emitGetClassName(scriptClassInfo.getName()); 92 } 93 94 cw.visitEnd(); 95 return cw.toByteArray(); 96 } 97 98 // --Internals only below this point 99 private void emitFields() { 100 // Introduce "Function" type instance fields for each 101 // constructor @Function in script class and introduce instance 102 // fields for each constructor @Property in the script class. 103 for (MemberInfo memInfo : scriptClassInfo.getMembers()) { 104 if (memInfo.isConstructorFunction()) { 105 addFunctionField(memInfo.getJavaName()); 106 memInfo = (MemberInfo)memInfo.clone(); 107 memInfo.setJavaDesc(OBJECT_DESC); 108 memInfo.setJavaAccess(ACC_PUBLIC); 109 addGetter(className, memInfo); 110 addSetter(className, memInfo); 111 } else if (memInfo.isConstructorProperty()) { 112 if (memInfo.isStaticFinal()) { 113 addGetter(scriptClassInfo.getJavaName(), memInfo); 114 } else { 115 addField(memInfo.getJavaName(), memInfo.getJavaDesc()); 116 memInfo = (MemberInfo)memInfo.clone(); 117 memInfo.setJavaAccess(ACC_PUBLIC); 118 addGetter(className, memInfo); 119 addSetter(className, memInfo); 120 } 121 } 122 } 123 124 addMapField(); 125 } 126 127 private void emitStaticInitializer() { 128 final MethodGenerator mi = makeStaticInitializer(); 129 emitStaticInitPrefix(mi, className, memberCount); 130 131 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 132 if (memInfo.isConstructorFunction() || memInfo.isConstructorProperty()) { 133 linkerAddGetterSetter(mi, className, memInfo); 134 } else if (memInfo.isConstructorGetter()) { 135 final MemberInfo setter = scriptClassInfo.findSetter(memInfo); 136 linkerAddGetterSetter(mi, scriptClassInfo.getJavaName(), memInfo, setter); 137 } 138 } 139 emitStaticInitSuffix(mi, className); 140 } 141 142 private void emitConstructor() { 143 final MethodGenerator mi = makeConstructor(); 144 mi.visitCode(); 145 callSuper(mi); 146 147 if (memberCount > 0) { 148 // initialize Function type fields 149 initFunctionFields(mi); 150 // initialize data fields 151 initDataFields(mi); 152 } 153 154 if (constructor != null) { 155 final int arity = constructor.getArity(); 156 if (arity != MemberInfo.DEFAULT_ARITY) { 157 mi.loadThis(); 158 mi.push(arity); 159 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETARITY, 160 SCRIPTFUNCTION_SETARITY_DESC); 161 } 162 } 163 mi.returnVoid(); 164 mi.computeMaxs(); 165 mi.visitEnd(); 166 } 167 168 private void loadMap(final MethodGenerator mi) { 169 if (memberCount > 0) { 170 mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC); 171 } 172 } 173 174 private void callSuper(final MethodGenerator mi) { 175 String superClass, superDesc; 176 mi.loadThis(); 177 if (constructor == null) { 178 // call ScriptObject.<init> 179 superClass = SCRIPTOBJECT_TYPE; 180 superDesc = (memberCount > 0) ? SCRIPTOBJECT_INIT_DESC : DEFAULT_INIT_DESC; 181 loadMap(mi); 182 } else { 183 // call Function.<init> 184 superClass = SCRIPTFUNCTIONIMPL_TYPE; 185 superDesc = (memberCount > 0) ? SCRIPTFUNCTIONIMPL_INIT_DESC4 : SCRIPTFUNCTIONIMPL_INIT_DESC3; 186 mi.loadLiteral(constructor.getName()); 187 mi.visitLdcInsn(new Handle(H_INVOKESTATIC, scriptClassInfo.getJavaName(), constructor.getJavaName(), constructor.getJavaDesc())); 188 loadMap(mi); 189 mi.memberInfoArray(scriptClassInfo.getJavaName(), specs); //pushes null if specs empty 190 } 191 192 mi.invokeSpecial(superClass, INIT, superDesc); 193 } 194 195 private void initFunctionFields(final MethodGenerator mi) { 196 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 197 if (!memInfo.isConstructorFunction()) { 198 continue; 199 } 200 mi.loadThis(); 201 newFunction(mi, scriptClassInfo.getJavaName(), memInfo, scriptClassInfo.findSpecializations(memInfo.getJavaName())); 202 mi.putField(className, memInfo.getJavaName(), OBJECT_DESC); 203 } 204 } 205 206 private void initDataFields(final MethodGenerator mi) { 207 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) { 208 if (!memInfo.isConstructorProperty() || memInfo.isFinal()) { 209 continue; 210 } 211 final Object value = memInfo.getValue(); 212 if (value != null) { 213 mi.loadThis(); 214 mi.loadLiteral(value); 215 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 216 } else if (!memInfo.getInitClass().isEmpty()) { 217 final String clazz = memInfo.getInitClass(); 218 mi.loadThis(); 219 mi.newObject(clazz); 220 mi.dup(); 221 mi.invokeSpecial(clazz, INIT, DEFAULT_INIT_DESC); 222 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc()); 223 } 224 } 225 226 if (constructor != null) { 227 mi.loadThis(); 228 final String protoName = scriptClassInfo.getPrototypeClassName(); 229 mi.newObject(protoName); 230 mi.dup(); 231 mi.invokeSpecial(protoName, INIT, DEFAULT_INIT_DESC); 232 mi.dup(); 233 mi.loadThis(); 234 mi.invokeStatic(PROTOTYPEOBJECT_TYPE, PROTOTYPEOBJECT_SETCONSTRUCTOR, 235 PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC); 236 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETPROTOTYPE, SCRIPTFUNCTION_SETPROTOTYPE_DESC); 237 } 238 } 239 240 /** 241 * Entry point for ConstructorGenerator run separately as an application. Will display 242 * usage. Takes one argument, a class name. 243 * @param args args vector 244 * @throws IOException if class can't be read 245 */ 246 public static void main(final String[] args) throws IOException { 247 if (args.length != 1) { 248 System.err.println("Usage: " + ConstructorGenerator.class.getName() + " <class>"); 249 System.exit(1); 250 } 251 252 final String className = args[0].replace('.', '/'); 253 final ScriptClassInfo sci = getScriptClassInfo(className + ".class"); 254 if (sci == null) { 255 System.err.println("No @ScriptClass in " + className); 256 System.exit(2); 257 throw new IOException(); // get rid of warning for sci.verify() below - may be null 258 } 259 260 try { 261 sci.verify(); 262 } catch (final Exception e) { 263 System.err.println(e.getMessage()); 264 System.exit(3); 265 } 266 final ConstructorGenerator gen = new ConstructorGenerator(sci); 267 try (FileOutputStream fos = new FileOutputStream(className + CONSTRUCTOR_SUFFIX + ".class")) { 268 fos.write(gen.getClassBytes()); 269 } 270 } 271 }