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_SETDOCUMENTATIONKEY;
46 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTION_SETDOCUMENTATIONKEY_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
165 mi.loadThis();
166 mi.loadLiteral(scriptClassInfo.getName());
167 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETDOCUMENTATIONKEY,
168 SCRIPTFUNCTION_SETDOCUMENTATIONKEY_DESC);
169 }
170 mi.returnVoid();
171 mi.computeMaxs();
172 mi.visitEnd();
173 }
174
175 private void loadMap(final MethodGenerator mi) {
176 if (memberCount > 0) {
177 mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC);
178 }
179 }
180
181 private void callSuper(final MethodGenerator mi) {
182 String superClass, superDesc;
183 mi.loadThis();
184 if (constructor == null) {
185 // call ScriptObject.<init>
186 superClass = SCRIPTOBJECT_TYPE;
187 superDesc = (memberCount > 0) ? SCRIPTOBJECT_INIT_DESC : DEFAULT_INIT_DESC;
188 loadMap(mi);
189 } else {
190 // call Function.<init>
191 superClass = SCRIPTFUNCTION_TYPE;
192 superDesc = (memberCount > 0) ? SCRIPTFUNCTION_INIT_DESC4 : SCRIPTFUNCTION_INIT_DESC3;
193 mi.loadLiteral(constructor.getName());
194 mi.visitLdcInsn(new Handle(H_INVOKESTATIC, scriptClassInfo.getJavaName(), constructor.getJavaName(), constructor.getJavaDesc(), false));
195 loadMap(mi);
196 mi.memberInfoArray(scriptClassInfo.getJavaName(), specs); //pushes null if specs empty
197 }
198
199 mi.invokeSpecial(superClass, INIT, superDesc);
200 }
201
202 private void initFunctionFields(final MethodGenerator mi) {
203 assert memberCount > 0;
204 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
205 if (!memInfo.isConstructorFunction()) {
206 continue;
207 }
208 mi.loadThis();
209 newFunction(mi, scriptClassInfo.getName(), scriptClassInfo.getJavaName(), memInfo, scriptClassInfo.findSpecializations(memInfo.getJavaName()));
210 mi.putField(className, memInfo.getJavaName(), OBJECT_DESC);
211 }
212 }
213
214 private void initDataFields(final MethodGenerator mi) {
215 assert memberCount > 0;
216 for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
217 if (!memInfo.isConstructorProperty() || memInfo.isFinal()) {
218 continue;
219 }
220 final Object value = memInfo.getValue();
221 if (value != null) {
222 mi.loadThis();
223 mi.loadLiteral(value);
224 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc());
225 } else if (!memInfo.getInitClass().isEmpty()) {
226 final String clazz = memInfo.getInitClass();
227 mi.loadThis();
228 mi.newObject(clazz);
229 mi.dup();
230 mi.invokeSpecial(clazz, INIT, DEFAULT_INIT_DESC);
231 mi.putField(className, memInfo.getJavaName(), memInfo.getJavaDesc());
232 }
233 }
234 }
235
236 private void initPrototype(final MethodGenerator mi) {
237 assert constructor != null;
238 mi.loadThis();
239 final String protoName = scriptClassInfo.getPrototypeClassName();
240 mi.newObject(protoName);
241 mi.dup();
242 mi.invokeSpecial(protoName, INIT, DEFAULT_INIT_DESC);
243 mi.dup();
244 mi.loadThis();
245 mi.invokeStatic(PROTOTYPEOBJECT_TYPE, PROTOTYPEOBJECT_SETCONSTRUCTOR,
246 PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC);
247 mi.invokeVirtual(SCRIPTFUNCTION_TYPE, SCRIPTFUNCTION_SETPROTOTYPE, SCRIPTFUNCTION_SETPROTOTYPE_DESC);
248 }
249
250 /**
251 * Entry point for ConstructorGenerator run separately as an application. Will display
252 * usage. Takes one argument, a class name.
253 * @param args args vector
254 * @throws IOException if class can't be read
255 */
256 public static void main(final String[] args) throws IOException {
257 if (args.length != 1) {
258 System.err.println("Usage: " + ConstructorGenerator.class.getName() + " <class>");
259 System.exit(1);
260 }
261
262 final String className = args[0].replace('.', '/');
263 final ScriptClassInfo sci = getScriptClassInfo(className + ".class");
264 if (sci == null) {
265 System.err.println("No @ScriptClass in " + className);
266 System.exit(2);
267 throw new IOException(); // get rid of warning for sci.verify() below - may be null
268 }
269
270 try {
271 sci.verify();
272 } catch (final Exception e) {
273 System.err.println(e.getMessage());
274 System.exit(3);
275 }
276 final ConstructorGenerator gen = new ConstructorGenerator(sci);
277 try (FileOutputStream fos = new FileOutputStream(className + CONSTRUCTOR_SUFFIX + ".class")) {
278 fos.write(gen.getClassBytes());
279 }
280 }
281 }