1 /*
2 * Copyright (c) 2012, 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 java.lang.invoke;
27
28 import jdk.internal.org.objectweb.asm.*;
29 import sun.invoke.util.BytecodeDescriptor;
30 import jdk.internal.misc.Unsafe;
31 import sun.security.action.GetPropertyAction;
32 import sun.security.action.GetBooleanAction;
33
34 import java.io.FilePermission;
35 import java.io.Serializable;
36 import java.lang.reflect.Constructor;
37 import java.security.AccessController;
38 import java.security.PrivilegedAction;
39 import java.util.LinkedHashSet;
40 import java.util.concurrent.atomic.AtomicInteger;
41 import java.util.PropertyPermission;
42 import java.util.Set;
43
44 import static jdk.internal.org.objectweb.asm.Opcodes.*;
45
46 /**
47 * Lambda metafactory implementation which dynamically creates an
48 * inner-class-like class per lambda callsite.
49 *
50 * @see LambdaMetafactory
51 */
52 /* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory {
53 private static final Unsafe UNSAFE = Unsafe.getUnsafe();
54
55 private static final int CLASSFILE_VERSION = 52;
56 private static final String METHOD_DESCRIPTOR_VOID = Type.getMethodDescriptor(Type.VOID_TYPE);
57 private static final String JAVA_LANG_OBJECT = "java/lang/Object";
58 private static final String NAME_CTOR = "<init>";
59 private static final String NAME_FACTORY = "get$Lambda";
60
61 //Serialization support
62 private static final String NAME_SERIALIZED_LAMBDA = "java/lang/invoke/SerializedLambda";
63 private static final String NAME_NOT_SERIALIZABLE_EXCEPTION = "java/io/NotSerializableException";
64 private static final String DESCR_METHOD_WRITE_REPLACE = "()Ljava/lang/Object;";
65 private static final String DESCR_METHOD_WRITE_OBJECT = "(Ljava/io/ObjectOutputStream;)V";
66 private static final String DESCR_METHOD_READ_OBJECT = "(Ljava/io/ObjectInputStream;)V";
67 private static final String NAME_METHOD_WRITE_REPLACE = "writeReplace";
68 private static final String NAME_METHOD_READ_OBJECT = "readObject";
69 private static final String NAME_METHOD_WRITE_OBJECT = "writeObject";
70
71 private static final String DESCR_CLASS = "Ljava/lang/Class;";
72 private static final String DESCR_STRING = "Ljava/lang/String;";
73 private static final String DESCR_OBJECT = "Ljava/lang/Object;";
74 private static final String DESCR_CTOR_SERIALIZED_LAMBDA
75 = "(" + DESCR_CLASS + DESCR_STRING + DESCR_STRING + DESCR_STRING + "I"
76 + DESCR_STRING + DESCR_STRING + DESCR_STRING + DESCR_STRING + "[" + DESCR_OBJECT + ")V";
77
78 private static final String DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION = "(Ljava/lang/String;)V";
79 private static final String[] SER_HOSTILE_EXCEPTIONS = new String[] {NAME_NOT_SERIALIZABLE_EXCEPTION};
80
81 private static final String DESCR_HIDDEN = "Ljdk/internal/vm/annotation/Hidden;";
82
83 private static final String[] EMPTY_STRING_ARRAY = new String[0];
84
85 // Used to ensure that each spun class name is unique
86 private static final AtomicInteger counter = new AtomicInteger(0);
87
88 // For dumping generated classes to disk, for debugging purposes
89 private static final ProxyClassesDumper dumper;
90
91 private static final boolean disableEagerInitialization;
92
93 static {
94 final String dumpProxyClassesKey = "jdk.internal.lambda.dumpProxyClasses";
95 String dumpPath = GetPropertyAction.privilegedGetProperty(dumpProxyClassesKey);
96 dumper = (null == dumpPath) ? null : ProxyClassesDumper.getInstance(dumpPath);
97
98 final String disableEagerInitializationKey = "jdk.internal.lambda.disableEagerInitialization";
99 disableEagerInitialization = GetBooleanAction.privilegedGetProperty(disableEagerInitializationKey);
100 }
101
102 // See context values in AbstractValidatingLambdaMetafactory
103 private final String implMethodClassName; // Name of type containing implementation "CC"
104 private final String implMethodName; // Name of implementation method "impl"
105 private final String implMethodDesc; // Type descriptor for implementation methods "(I)Ljava/lang/String;"
106 private final MethodType constructorType; // Generated class constructor type "(CC)void"
107 private final ClassWriter cw; // ASM class writer
108 private final String[] argNames; // Generated names for the constructor arguments
109 private final String[] argDescs; // Type descriptors for the constructor arguments
110 private final String lambdaClassName; // Generated name for the generated class "X$$Lambda$1"
111
112 /**
113 * General meta-factory constructor, supporting both standard cases and
114 * allowing for uncommon options such as serialization or bridging.
115 *
116 * @param caller Stacked automatically by VM; represents a lookup context
117 * with the accessibility privileges of the caller.
118 * @param invokedType Stacked automatically by VM; the signature of the
119 * invoked method, which includes the expected static
120 * type of the returned lambda object, and the static
121 * types of the captured arguments for the lambda. In
122 * the event that the implementation method is an
123 * instance method, the first argument in the invocation
124 * signature will correspond to the receiver.
125 * @param samMethodName Name of the method in the functional interface to
126 * which the lambda or method reference is being
127 * converted, represented as a String.
128 * @param samMethodType Type of the method in the functional interface to
129 * which the lambda or method reference is being
130 * converted, represented as a MethodType.
131 * @param implMethod The implementation method which should be called (with
132 * suitable adaptation of argument types, return types,
133 * and adjustment for captured arguments) when methods of
134 * the resulting functional interface instance are invoked.
135 * @param instantiatedMethodType The signature of the primary functional
136 * interface method after type variables are
137 * substituted with their instantiation from
138 * the capture site
139 * @param isSerializable Should the lambda be made serializable? If set,
140 * either the target type or one of the additional SAM
141 * types must extend {@code Serializable}.
142 * @param markerInterfaces Additional interfaces which the lambda object
143 * should implement.
144 * @param additionalBridges Method types for additional signatures to be
145 * bridged to the implementation method
146 * @throws LambdaConversionException If any of the meta-factory protocol
147 * invariants are violated
148 */
149 public InnerClassLambdaMetafactory(MethodHandles.Lookup caller,
150 MethodType invokedType,
151 String samMethodName,
152 MethodType samMethodType,
153 MethodHandle implMethod,
154 MethodType instantiatedMethodType,
155 boolean isSerializable,
156 Class<?>[] markerInterfaces,
157 MethodType[] additionalBridges)
158 throws LambdaConversionException {
159 super(caller, invokedType, samMethodName, samMethodType,
160 implMethod, instantiatedMethodType,
161 isSerializable, markerInterfaces, additionalBridges);
162 implMethodClassName = implClass.getName().replace('.', '/');
163 implMethodName = implInfo.getName();
164 implMethodDesc = implInfo.getMethodType().toMethodDescriptorString();
165 constructorType = invokedType.changeReturnType(Void.TYPE);
166 lambdaClassName = targetClass.getName().replace('.', '/') + "$$Lambda$" + counter.incrementAndGet();
167 cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
168 int parameterCount = invokedType.parameterCount();
169 if (parameterCount > 0) {
170 argNames = new String[parameterCount];
171 argDescs = new String[parameterCount];
172 for (int i = 0; i < parameterCount; i++) {
173 argNames[i] = "arg$" + (i + 1);
174 argDescs[i] = BytecodeDescriptor.unparse(invokedType.parameterType(i));
175 }
176 } else {
177 argNames = argDescs = EMPTY_STRING_ARRAY;
178 }
179 }
180
181 /**
182 * Build the CallSite. Generate a class file which implements the functional
183 * interface, define the class, if there are no parameters create an instance
184 * of the class which the CallSite will return, otherwise, generate handles
185 * which will call the class' constructor.
186 *
187 * @return a CallSite, which, when invoked, will return an instance of the
188 * functional interface
189 * @throws ReflectiveOperationException
190 * @throws LambdaConversionException If properly formed functional interface
191 * is not found
192 */
193 @Override
194 CallSite buildCallSite() throws LambdaConversionException {
195 final Class<?> innerClass = spinInnerClass();
196 if (invokedType.parameterCount() == 0 && !disableEagerInitialization) {
197 // In the case of a non-capturing lambda, we optimize linkage by pre-computing a single instance,
198 // unless we've suppressed eager initialization
199 final Constructor<?>[] ctrs = AccessController.doPrivileged(
200 new PrivilegedAction<>() {
201 @Override
202 public Constructor<?>[] run() {
203 Constructor<?>[] ctrs = innerClass.getDeclaredConstructors();
204 if (ctrs.length == 1) {
205 // The lambda implementing inner class constructor is private, set
206 // it accessible (by us) before creating the constant sole instance
207 ctrs[0].setAccessible(true);
208 }
209 return ctrs;
210 }
211 });
212 if (ctrs.length != 1) {
213 throw new LambdaConversionException("Expected one lambda constructor for "
214 + innerClass.getCanonicalName() + ", got " + ctrs.length);
215 }
216
217 try {
218 Object inst = ctrs[0].newInstance();
219 return new ConstantCallSite(MethodHandles.constant(samBase, inst));
220 }
221 catch (ReflectiveOperationException e) {
222 throw new LambdaConversionException("Exception instantiating lambda object", e);
223 }
224 } else {
225 try {
226 if (!disableEagerInitialization) {
227 UNSAFE.ensureClassInitialized(innerClass);
228 }
229 return new ConstantCallSite(
230 MethodHandles.Lookup.IMPL_LOOKUP
231 .findStatic(innerClass, NAME_FACTORY, invokedType));
232 }
233 catch (ReflectiveOperationException e) {
234 throw new LambdaConversionException("Exception finding constructor", e);
235 }
236 }
237 }
238
239 /**
240 * Generate a class file which implements the functional
241 * interface, define and return the class.
242 *
243 * @implNote The class that is generated does not include signature
244 * information for exceptions that may be present on the SAM method.
245 * This is to reduce classfile size, and is harmless as checked exceptions
246 * are erased anyway, no one will ever compile against this classfile,
247 * and we make no guarantees about the reflective properties of lambda
248 * objects.
249 *
250 * @return a Class which implements the functional interface
251 * @throws LambdaConversionException If properly formed functional interface
252 * is not found
253 */
254 private Class<?> spinInnerClass() throws LambdaConversionException {
255 String[] interfaces;
256 String samIntf = samBase.getName().replace('.', '/');
257 boolean accidentallySerializable = !isSerializable && Serializable.class.isAssignableFrom(samBase);
258 if (markerInterfaces.length == 0) {
259 interfaces = new String[]{samIntf};
260 } else {
261 // Assure no duplicate interfaces (ClassFormatError)
262 Set<String> itfs = new LinkedHashSet<>(markerInterfaces.length + 1);
263 itfs.add(samIntf);
264 for (Class<?> markerInterface : markerInterfaces) {
265 itfs.add(markerInterface.getName().replace('.', '/'));
266 accidentallySerializable |= !isSerializable && Serializable.class.isAssignableFrom(markerInterface);
267 }
268 interfaces = itfs.toArray(new String[itfs.size()]);
269 }
270
271 cw.visit(CLASSFILE_VERSION, ACC_SUPER + ACC_FINAL + ACC_SYNTHETIC,
272 lambdaClassName, null,
273 JAVA_LANG_OBJECT, interfaces);
274
275 // Generate final fields to be filled in by constructor
276 for (int i = 0; i < argDescs.length; i++) {
277 FieldVisitor fv = cw.visitField(ACC_PRIVATE + ACC_FINAL,
278 argNames[i],
279 argDescs[i],
280 null, null);
281 fv.visitEnd();
282 }
283
284 generateConstructor();
285
286 if (invokedType.parameterCount() != 0 || disableEagerInitialization) {
287 generateFactory();
288 }
289
290 // Forward the SAM method
291 MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, samMethodName,
292 samMethodType.toMethodDescriptorString(), null, null);
293 mv.visitAnnotation(DESCR_HIDDEN, true);
294 new ForwardingMethodGenerator(mv).generate(samMethodType);
295
296 // Forward the bridges
297 if (additionalBridges != null) {
298 for (MethodType mt : additionalBridges) {
299 mv = cw.visitMethod(ACC_PUBLIC|ACC_BRIDGE, samMethodName,
300 mt.toMethodDescriptorString(), null, null);
301 mv.visitAnnotation(DESCR_HIDDEN, true);
302 new ForwardingMethodGenerator(mv).generate(mt);
303 }
304 }
305
306 if (isSerializable)
307 generateSerializationFriendlyMethods();
308 else if (accidentallySerializable)
309 generateSerializationHostileMethods();
310
311 cw.visitEnd();
312
313 // Define the generated class in this VM.
314
315 final byte[] classBytes = cw.toByteArray();
316
317 // If requested, dump out to a file for debugging purposes
318 if (dumper != null) {
319 AccessController.doPrivileged(new PrivilegedAction<>() {
320 @Override
321 public Void run() {
322 dumper.dumpClass(lambdaClassName, classBytes);
323 return null;
324 }
325 }, null,
326 new FilePermission("<<ALL FILES>>", "read, write"),
327 // createDirectories may need it
328 new PropertyPermission("user.dir", "read"));
329 }
330
331 return UNSAFE.defineAnonymousClass(targetClass, classBytes, null);
332 }
333
334 /**
335 * Generate the factory method for the class
336 */
337 private void generateFactory() {
338 MethodVisitor m = cw.visitMethod(ACC_PRIVATE | ACC_STATIC, NAME_FACTORY, invokedType.toMethodDescriptorString(), null, null);
339 m.visitCode();
340 m.visitTypeInsn(NEW, lambdaClassName);
341 m.visitInsn(Opcodes.DUP);
342 int parameterCount = invokedType.parameterCount();
343 for (int typeIndex = 0, varIndex = 0; typeIndex < parameterCount; typeIndex++) {
344 Class<?> argType = invokedType.parameterType(typeIndex);
345 m.visitVarInsn(getLoadOpcode(argType), varIndex);
346 varIndex += getParameterSize(argType);
347 }
348 m.visitMethodInsn(INVOKESPECIAL, lambdaClassName, NAME_CTOR, constructorType.toMethodDescriptorString(), false);
349 m.visitInsn(ARETURN);
350 m.visitMaxs(-1, -1);
351 m.visitEnd();
352 }
353
354 /**
355 * Generate the constructor for the class
356 */
357 private void generateConstructor() {
358 // Generate constructor
359 MethodVisitor ctor = cw.visitMethod(ACC_PRIVATE, NAME_CTOR,
360 constructorType.toMethodDescriptorString(), null, null);
361 ctor.visitCode();
362 ctor.visitVarInsn(ALOAD, 0);
363 ctor.visitMethodInsn(INVOKESPECIAL, JAVA_LANG_OBJECT, NAME_CTOR,
364 METHOD_DESCRIPTOR_VOID, false);
365 int parameterCount = invokedType.parameterCount();
366 for (int i = 0, lvIndex = 0; i < parameterCount; i++) {
367 ctor.visitVarInsn(ALOAD, 0);
368 Class<?> argType = invokedType.parameterType(i);
369 ctor.visitVarInsn(getLoadOpcode(argType), lvIndex + 1);
370 lvIndex += getParameterSize(argType);
371 ctor.visitFieldInsn(PUTFIELD, lambdaClassName, argNames[i], argDescs[i]);
372 }
373 ctor.visitInsn(RETURN);
374 // Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored
375 ctor.visitMaxs(-1, -1);
376 ctor.visitEnd();
377 }
378
379 /**
380 * Generate a writeReplace method that supports serialization
381 */
382 private void generateSerializationFriendlyMethods() {
383 TypeConvertingMethodAdapter mv
384 = new TypeConvertingMethodAdapter(
385 cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
386 NAME_METHOD_WRITE_REPLACE, DESCR_METHOD_WRITE_REPLACE,
387 null, null));
388
389 mv.visitCode();
390 mv.visitTypeInsn(NEW, NAME_SERIALIZED_LAMBDA);
391 mv.visitInsn(DUP);
392 mv.visitLdcInsn(Type.getType(targetClass));
393 mv.visitLdcInsn(invokedType.returnType().getName().replace('.', '/'));
394 mv.visitLdcInsn(samMethodName);
395 mv.visitLdcInsn(samMethodType.toMethodDescriptorString());
396 mv.visitLdcInsn(implInfo.getReferenceKind());
397 mv.visitLdcInsn(implInfo.getDeclaringClass().getName().replace('.', '/'));
398 mv.visitLdcInsn(implInfo.getName());
399 mv.visitLdcInsn(implInfo.getMethodType().toMethodDescriptorString());
400 mv.visitLdcInsn(instantiatedMethodType.toMethodDescriptorString());
401 mv.iconst(argDescs.length);
402 mv.visitTypeInsn(ANEWARRAY, JAVA_LANG_OBJECT);
403 for (int i = 0; i < argDescs.length; i++) {
404 mv.visitInsn(DUP);
405 mv.iconst(i);
406 mv.visitVarInsn(ALOAD, 0);
407 mv.visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]);
408 mv.boxIfTypePrimitive(Type.getType(argDescs[i]));
409 mv.visitInsn(AASTORE);
410 }
411 mv.visitMethodInsn(INVOKESPECIAL, NAME_SERIALIZED_LAMBDA, NAME_CTOR,
412 DESCR_CTOR_SERIALIZED_LAMBDA, false);
413 mv.visitInsn(ARETURN);
414 // Maxs computed by ClassWriter.COMPUTE_MAXS, these arguments ignored
415 mv.visitMaxs(-1, -1);
416 mv.visitEnd();
417 }
418
419 /**
420 * Generate a readObject/writeObject method that is hostile to serialization
421 */
422 private void generateSerializationHostileMethods() {
423 MethodVisitor mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
424 NAME_METHOD_WRITE_OBJECT, DESCR_METHOD_WRITE_OBJECT,
425 null, SER_HOSTILE_EXCEPTIONS);
426 mv.visitCode();
427 mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION);
428 mv.visitInsn(DUP);
429 mv.visitLdcInsn("Non-serializable lambda");
430 mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR,
431 DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false);
432 mv.visitInsn(ATHROW);
433 mv.visitMaxs(-1, -1);
434 mv.visitEnd();
435
436 mv = cw.visitMethod(ACC_PRIVATE + ACC_FINAL,
437 NAME_METHOD_READ_OBJECT, DESCR_METHOD_READ_OBJECT,
438 null, SER_HOSTILE_EXCEPTIONS);
439 mv.visitCode();
440 mv.visitTypeInsn(NEW, NAME_NOT_SERIALIZABLE_EXCEPTION);
441 mv.visitInsn(DUP);
442 mv.visitLdcInsn("Non-serializable lambda");
443 mv.visitMethodInsn(INVOKESPECIAL, NAME_NOT_SERIALIZABLE_EXCEPTION, NAME_CTOR,
444 DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION, false);
445 mv.visitInsn(ATHROW);
446 mv.visitMaxs(-1, -1);
447 mv.visitEnd();
448 }
449
450 /**
451 * This class generates a method body which calls the lambda implementation
452 * method, converting arguments, as needed.
453 */
454 private class ForwardingMethodGenerator extends TypeConvertingMethodAdapter {
455
456 ForwardingMethodGenerator(MethodVisitor mv) {
457 super(mv);
458 }
459
460 void generate(MethodType methodType) {
461 visitCode();
462
463 if (implKind == MethodHandleInfo.REF_newInvokeSpecial) {
464 visitTypeInsn(NEW, implMethodClassName);
465 visitInsn(DUP);
466 }
467 for (int i = 0; i < argNames.length; i++) {
468 visitVarInsn(ALOAD, 0);
469 visitFieldInsn(GETFIELD, lambdaClassName, argNames[i], argDescs[i]);
470 }
471
472 convertArgumentTypes(methodType);
473
474 // Invoke the method we want to forward to
475 visitMethodInsn(invocationOpcode(), implMethodClassName,
476 implMethodName, implMethodDesc,
477 implClass.isInterface());
478
479 // Convert the return value (if any) and return it
480 // Note: if adapting from non-void to void, the 'return'
481 // instruction will pop the unneeded result
482 Class<?> implReturnClass = implMethodType.returnType();
483 Class<?> samReturnClass = methodType.returnType();
484 convertType(implReturnClass, samReturnClass, samReturnClass);
485 visitInsn(getReturnOpcode(samReturnClass));
486 // Maxs computed by ClassWriter.COMPUTE_MAXS,these arguments ignored
487 visitMaxs(-1, -1);
488 visitEnd();
489 }
490
491 private void convertArgumentTypes(MethodType samType) {
492 int lvIndex = 0;
493 int samParametersLength = samType.parameterCount();
494 int captureArity = invokedType.parameterCount();
495 for (int i = 0; i < samParametersLength; i++) {
496 Class<?> argType = samType.parameterType(i);
497 visitVarInsn(getLoadOpcode(argType), lvIndex + 1);
498 lvIndex += getParameterSize(argType);
499 convertType(argType, implMethodType.parameterType(captureArity + i), instantiatedMethodType.parameterType(i));
500 }
501 }
502
503 private int invocationOpcode() throws InternalError {
504 switch (implKind) {
505 case MethodHandleInfo.REF_invokeStatic:
506 return INVOKESTATIC;
507 case MethodHandleInfo.REF_newInvokeSpecial:
508 return INVOKESPECIAL;
509 case MethodHandleInfo.REF_invokeVirtual:
510 return INVOKEVIRTUAL;
511 case MethodHandleInfo.REF_invokeInterface:
512 return INVOKEINTERFACE;
513 case MethodHandleInfo.REF_invokeSpecial:
514 return INVOKESPECIAL;
515 default:
516 throw new InternalError("Unexpected invocation kind: " + implKind);
517 }
518 }
519 }
520
521 static int getParameterSize(Class<?> c) {
522 if (c == Void.TYPE) {
523 return 0;
524 } else if (c == Long.TYPE || c == Double.TYPE) {
525 return 2;
526 }
527 return 1;
528 }
529
530 static int getLoadOpcode(Class<?> c) {
531 if(c == Void.TYPE) {
532 throw new InternalError("Unexpected void type of load opcode");
533 }
534 return ILOAD + getOpcodeOffset(c);
535 }
536
537 static int getReturnOpcode(Class<?> c) {
538 if(c == Void.TYPE) {
539 return RETURN;
540 }
541 return IRETURN + getOpcodeOffset(c);
542 }
543
544 private static int getOpcodeOffset(Class<?> c) {
545 if (c.isPrimitive()) {
546 if (c == Long.TYPE) {
547 return 1;
548 } else if (c == Float.TYPE) {
549 return 2;
550 } else if (c == Double.TYPE) {
551 return 3;
552 }
553 return 0;
554 } else {
555 return 4;
556 }
557 }
558
559 }