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
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 */
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]);
|
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 sun.security.action.GetPropertyAction;
31 import sun.security.action.GetBooleanAction;
32
33 import java.io.FilePermission;
34 import java.io.Serializable;
35 import java.lang.invoke.MethodHandles.Lookup;
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 java.lang.invoke.MethodHandles.Lookup.ClassOption.NESTMATE;
45 import static jdk.internal.org.objectweb.asm.Opcodes.*;
46
47 /**
48 * Lambda metafactory implementation which dynamically creates an
49 * inner-class-like class per lambda callsite.
50 *
51 * @see LambdaMetafactory
52 */
53 /* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory {
54 private static final int CLASSFILE_VERSION = 52;
55 private static final String METHOD_DESCRIPTOR_VOID = Type.getMethodDescriptor(Type.VOID_TYPE);
56 private static final String JAVA_LANG_OBJECT = "java/lang/Object";
57 private static final String NAME_CTOR = "<init>";
58
59 //Serialization support
60 private static final String NAME_SERIALIZED_LAMBDA = "java/lang/invoke/SerializedLambda";
61 private static final String NAME_NOT_SERIALIZABLE_EXCEPTION = "java/io/NotSerializableException";
62 private static final String DESCR_METHOD_WRITE_REPLACE = "()Ljava/lang/Object;";
63 private static final String DESCR_METHOD_WRITE_OBJECT = "(Ljava/io/ObjectOutputStream;)V";
64 private static final String DESCR_METHOD_READ_OBJECT = "(Ljava/io/ObjectInputStream;)V";
65 private static final String NAME_METHOD_WRITE_REPLACE = "writeReplace";
66 private static final String NAME_METHOD_READ_OBJECT = "readObject";
67 private static final String NAME_METHOD_WRITE_OBJECT = "writeObject";
68
69 private static final String DESCR_CLASS = "Ljava/lang/Class;";
70 private static final String DESCR_STRING = "Ljava/lang/String;";
71 private static final String DESCR_OBJECT = "Ljava/lang/Object;";
72 private static final String DESCR_CTOR_SERIALIZED_LAMBDA
73 = "(" + DESCR_CLASS + DESCR_STRING + DESCR_STRING + DESCR_STRING + "I"
74 + DESCR_STRING + DESCR_STRING + DESCR_STRING + DESCR_STRING + "[" + DESCR_OBJECT + ")V";
75
76 private static final String DESCR_CTOR_NOT_SERIALIZABLE_EXCEPTION = "(Ljava/lang/String;)V";
77 private static final String[] SER_HOSTILE_EXCEPTIONS = new String[] {NAME_NOT_SERIALIZABLE_EXCEPTION};
78
79 private static final String[] EMPTY_STRING_ARRAY = new String[0];
80
81 // Used to ensure that each spun class name is unique
82 private static final AtomicInteger counter = new AtomicInteger(0);
83
84 // For dumping generated classes to disk, for debugging purposes
85 private static final ProxyClassesDumper dumper;
86
87 private static final boolean disableEagerInitialization;
88
89 static {
90 final String dumpProxyClassesKey = "jdk.internal.lambda.dumpProxyClasses";
91 String dumpPath = GetPropertyAction.privilegedGetProperty(dumpProxyClassesKey);
92 dumper = (null == dumpPath) ? null : ProxyClassesDumper.getInstance(dumpPath);
93
94 final String disableEagerInitializationKey = "jdk.internal.lambda.disableEagerInitialization";
95 disableEagerInitialization = GetBooleanAction.privilegedGetProperty(disableEagerInitializationKey);
96 }
97
98 // See context values in AbstractValidatingLambdaMetafactory
142 * @throws LambdaConversionException If any of the meta-factory protocol
143 * invariants are violated
144 */
145 public InnerClassLambdaMetafactory(MethodHandles.Lookup caller,
146 MethodType invokedType,
147 String samMethodName,
148 MethodType samMethodType,
149 MethodHandle implMethod,
150 MethodType instantiatedMethodType,
151 boolean isSerializable,
152 Class<?>[] markerInterfaces,
153 MethodType[] additionalBridges)
154 throws LambdaConversionException {
155 super(caller, invokedType, samMethodName, samMethodType,
156 implMethod, instantiatedMethodType,
157 isSerializable, markerInterfaces, additionalBridges);
158 implMethodClassName = implClass.getName().replace('.', '/');
159 implMethodName = implInfo.getName();
160 implMethodDesc = implInfo.getMethodType().toMethodDescriptorString();
161 constructorType = invokedType.changeReturnType(Void.TYPE);
162 lambdaClassName = lambdaClassName(targetClass);
163 cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
164 int parameterCount = invokedType.parameterCount();
165 if (parameterCount > 0) {
166 argNames = new String[parameterCount];
167 argDescs = new String[parameterCount];
168 for (int i = 0; i < parameterCount; i++) {
169 argNames[i] = "arg$" + (i + 1);
170 argDescs[i] = BytecodeDescriptor.unparse(invokedType.parameterType(i));
171 }
172 } else {
173 argNames = argDescs = EMPTY_STRING_ARRAY;
174 }
175 }
176
177 private static String lambdaClassName(Class<?> targetClass) {
178 String name = targetClass.getName();
179 if (targetClass.isHiddenClass()) {
180 // use the original class name
181 name = name.replace('/', '_');
182 }
183 return name.replace('.', '/') + "$$Lambda$" + counter.incrementAndGet();
184 }
185
186 /**
187 * Build the CallSite. Generate a class file which implements the functional
188 * interface, define the class, if there are no parameters create an instance
189 * of the class which the CallSite will return, otherwise, generate handles
190 * which will call the class' constructor.
191 *
192 * @return a CallSite, which, when invoked, will return an instance of the
193 * functional interface
194 * @throws ReflectiveOperationException
195 * @throws LambdaConversionException If properly formed functional interface
196 * is not found
197 */
198 @Override
199 CallSite buildCallSite() throws LambdaConversionException {
200 final Class<?> innerClass = spinInnerClass();
201 assert innerClass.isHiddenClass() : innerClass.toString();
202 if (invokedType.parameterCount() == 0 && !disableEagerInitialization) {
203 // In the case of a non-capturing lambda, we optimize linkage by pre-computing a single instance,
204 // unless we've suppressed eager initialization
205 final Constructor<?>[] ctrs = AccessController.doPrivileged(
206 new PrivilegedAction<>() {
207 @Override
208 public Constructor<?>[] run() {
209 Constructor<?>[] ctrs = innerClass.getDeclaredConstructors();
210 if (ctrs.length == 1) {
211 // The lambda implementing inner class constructor is private, set
212 // it accessible (by us) before creating the constant sole instance
213 ctrs[0].setAccessible(true);
214 }
215 return ctrs;
216 }
217 });
218 if (ctrs.length != 1) {
219 throw new LambdaConversionException("Expected one lambda constructor for "
220 + innerClass.getCanonicalName() + ", got " + ctrs.length);
221 }
222
223 try {
224 Object inst = ctrs[0].newInstance();
225 return new ConstantCallSite(MethodHandles.constant(samBase, inst));
226 } catch (ReflectiveOperationException e) {
227 throw new LambdaConversionException("Exception instantiating lambda object", e);
228 }
229 } else {
230 try {
231 MethodHandle mh = caller.findConstructor(innerClass, invokedType.changeReturnType(void.class));
232 return new ConstantCallSite(mh.asType(invokedType));
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 */
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 // Forward the SAM method
287 MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, samMethodName,
288 samMethodType.toMethodDescriptorString(), null, null);
289 new ForwardingMethodGenerator(mv).generate(samMethodType);
290
291 // Forward the bridges
292 if (additionalBridges != null) {
293 for (MethodType mt : additionalBridges) {
294 mv = cw.visitMethod(ACC_PUBLIC|ACC_BRIDGE, samMethodName,
295 mt.toMethodDescriptorString(), null, null);
296 new ForwardingMethodGenerator(mv).generate(mt);
297 }
298 }
299
300 if (isSerializable)
301 generateSerializationFriendlyMethods();
302 else if (accidentallySerializable)
303 generateSerializationHostileMethods();
304
305 cw.visitEnd();
306
307 // Define the generated class in this VM.
308
309 final byte[] classBytes = cw.toByteArray();
310 // If requested, dump out to a file for debugging purposes
311 if (dumper != null) {
312 AccessController.doPrivileged(new PrivilegedAction<>() {
313 @Override
314 public Void run() {
315 dumper.dumpClass(lambdaClassName, classBytes);
316 return null;
317 }
318 }, null,
319 new FilePermission("<<ALL FILES>>", "read, write"),
320 // createDirectories may need it
321 new PropertyPermission("user.dir", "read"));
322 }
323 try {
324 // this class is linked at the indy callsite; so define a hidden nestmate
325 return caller.defineHiddenClass(classBytes, !disableEagerInitialization, NESTMATE).lookupClass();
326 } catch (IllegalAccessException e) {
327 throw new LambdaConversionException("Exception defining lambda proxy class", e);
328 }
329 }
330
331 /**
332 * Generate the constructor for the class
333 */
334 private void generateConstructor() {
335 // Generate constructor
336 MethodVisitor ctor = cw.visitMethod(ACC_PRIVATE, NAME_CTOR,
337 constructorType.toMethodDescriptorString(), null, null);
338 ctor.visitCode();
339 ctor.visitVarInsn(ALOAD, 0);
340 ctor.visitMethodInsn(INVOKESPECIAL, JAVA_LANG_OBJECT, NAME_CTOR,
341 METHOD_DESCRIPTOR_VOID, false);
342 int parameterCount = invokedType.parameterCount();
343 for (int i = 0, lvIndex = 0; i < parameterCount; i++) {
344 ctor.visitVarInsn(ALOAD, 0);
345 Class<?> argType = invokedType.parameterType(i);
346 ctor.visitVarInsn(getLoadOpcode(argType), lvIndex + 1);
347 lvIndex += getParameterSize(argType);
348 ctor.visitFieldInsn(PUTFIELD, lambdaClassName, argNames[i], argDescs[i]);
|