1 /*
2 * Copyright (c) 2012, 2024, 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.misc.CDS;
29 import jdk.internal.util.ClassFileDumper;
30 import sun.invoke.util.VerifyAccess;
31 import sun.security.action.GetBooleanAction;
32
33 import java.io.Serializable;
34 import java.lang.classfile.ClassBuilder;
35 import java.lang.classfile.ClassFile;
36 import java.lang.classfile.CodeBuilder;
37 import java.lang.classfile.MethodBuilder;
38 import java.lang.classfile.Opcode;
39 import java.lang.classfile.TypeKind;
40 import java.lang.constant.ClassDesc;
41 import java.lang.constant.MethodTypeDesc;
42 import java.lang.reflect.Modifier;
43 import java.util.LinkedHashSet;
44 import java.util.List;
45 import java.util.Set;
46 import java.util.function.Consumer;
47
48 import static java.lang.classfile.ClassFile.*;
49 import java.lang.classfile.attribute.ExceptionsAttribute;
50 import java.lang.classfile.constantpool.ClassEntry;
51 import java.lang.classfile.constantpool.ConstantPoolBuilder;
52
53 import static java.lang.constant.ConstantDescs.*;
54 import static java.lang.invoke.MethodHandleNatives.Constants.NESTMATE_CLASS;
55 import static java.lang.invoke.MethodHandleNatives.Constants.STRONG_LOADER_LINK;
56 import static java.lang.invoke.MethodType.methodType;
57 import jdk.internal.constant.ConstantUtils;
58 import jdk.internal.constant.MethodTypeDescImpl;
59 import jdk.internal.constant.ReferenceClassDescImpl;
60 import jdk.internal.vm.annotation.Stable;
61 import sun.invoke.util.Wrapper;
62
63 /**
64 * Lambda metafactory implementation which dynamically creates an
65 * inner-class-like class per lambda callsite.
66 *
67 * @see LambdaMetafactory
68 */
69 /* package */ final class InnerClassLambdaMetafactory extends AbstractValidatingLambdaMetafactory {
70 private static final String LAMBDA_INSTANCE_FIELD = "LAMBDA_INSTANCE$";
71 private static final @Stable String[] ARG_NAME_CACHE = {"arg$1", "arg$2", "arg$3", "arg$4", "arg$5", "arg$6", "arg$7", "arg$8"};
72 private static final ClassDesc[] EMPTY_CLASSDESC_ARRAY = ConstantUtils.EMPTY_CLASSDESC;
73
74 // For dumping generated classes to disk, for debugging purposes
75 private static final ClassFileDumper lambdaProxyClassFileDumper;
76
77 private static final boolean disableEagerInitialization;
78
79 static {
80 // To dump the lambda proxy classes, set this system property:
81 // -Djdk.invoke.LambdaMetafactory.dumpProxyClassFiles
82 // or -Djdk.invoke.LambdaMetafactory.dumpProxyClassFiles=true
83 final String dumpProxyClassesKey = "jdk.invoke.LambdaMetafactory.dumpProxyClassFiles";
84 lambdaProxyClassFileDumper = ClassFileDumper.getInstance(dumpProxyClassesKey, "DUMP_LAMBDA_PROXY_CLASS_FILES");
85
86 final String disableEagerInitializationKey = "jdk.internal.lambda.disableEagerInitialization";
87 disableEagerInitialization = GetBooleanAction.privilegedGetProperty(disableEagerInitializationKey);
88 }
89
90 // See context values in AbstractValidatingLambdaMetafactory
91 private final ClassDesc implMethodClassDesc; // Name of type containing implementation "CC"
92 private final String implMethodName; // Name of implementation method "impl"
93 private final MethodTypeDesc implMethodDesc; // Type descriptor for implementation methods "(I)Ljava/lang/String;"
94 private final MethodType constructorType; // Generated class constructor type "(CC)void"
95 private final MethodTypeDesc constructorTypeDesc;// Type descriptor for the generated class constructor type "(CC)void"
96 private final ClassDesc[] argDescs; // Type descriptors for the constructor arguments
97 private final String lambdaClassName; // Generated name for the generated class "X$$Lambda$1"
98 private final ConstantPoolBuilder pool = ConstantPoolBuilder.of();
99 private final ClassEntry lambdaClassEntry; // Class entry for the generated class "X$$Lambda$1"
100 private final boolean useImplMethodHandle; // use MethodHandle invocation instead of symbolic bytecode invocation
101
102 /**
103 * General meta-factory constructor, supporting both standard cases and
104 * allowing for uncommon options such as serialization or bridging.
105 *
106 * @param caller Stacked automatically by VM; represents a lookup context
107 * with the accessibility privileges of the caller.
108 * @param factoryType Stacked automatically by VM; the signature of the
109 * invoked method, which includes the expected static
110 * type of the returned lambda object, and the static
111 * types of the captured arguments for the lambda. In
112 * the event that the implementation method is an
113 * instance method, the first argument in the invocation
114 * signature will correspond to the receiver.
115 * @param interfaceMethodName Name of the method in the functional interface to
116 * which the lambda or method reference is being
117 * converted, represented as a String.
118 * @param interfaceMethodType Type of the method in the functional interface to
119 * which the lambda or method reference is being
120 * converted, represented as a MethodType.
121 * @param implementation The implementation method which should be called (with
122 * suitable adaptation of argument types, return types,
123 * and adjustment for captured arguments) when methods of
124 * the resulting functional interface instance are invoked.
125 * @param dynamicMethodType The signature of the primary functional
126 * interface method after type variables are
127 * substituted with their instantiation from
128 * the capture site
129 * @param isSerializable Should the lambda be made serializable? If set,
130 * either the target type or one of the additional SAM
131 * types must extend {@code Serializable}.
132 * @param altInterfaces Additional interfaces which the lambda object
133 * should implement.
134 * @param altMethods Method types for additional signatures to be
135 * implemented by invoking the implementation method
136 * @throws LambdaConversionException If any of the meta-factory protocol
137 * invariants are violated
138 * @throws SecurityException If a security manager is present, and it
139 * <a href="MethodHandles.Lookup.html#secmgr">denies access</a>
140 * from {@code caller} to the package of {@code implementation}.
141 */
142 public InnerClassLambdaMetafactory(MethodHandles.Lookup caller,
143 MethodType factoryType,
144 String interfaceMethodName,
145 MethodType interfaceMethodType,
146 MethodHandle implementation,
147 MethodType dynamicMethodType,
148 boolean isSerializable,
149 Class<?>[] altInterfaces,
150 MethodType[] altMethods)
151 throws LambdaConversionException {
152 super(caller, factoryType, interfaceMethodName, interfaceMethodType,
153 implementation, dynamicMethodType,
154 isSerializable, altInterfaces, altMethods);
155 implMethodClassDesc = implClassDesc(implClass);
156 implMethodName = implInfo.getName();
157 implMethodDesc = methodDesc(implInfo.getMethodType());
158 constructorType = factoryType.changeReturnType(Void.TYPE);
159 lambdaClassName = lambdaClassName(targetClass);
160 lambdaClassEntry = pool.classEntry(ReferenceClassDescImpl.ofValidated(ConstantUtils.concat("L", lambdaClassName, ";")));
161 // If the target class invokes a protected method inherited from a
162 // superclass in a different package, or does 'invokespecial', the
163 // lambda class has no access to the resolved method, or does
164 // 'invokestatic' on a hidden class which cannot be resolved by name.
165 // Instead, we need to pass the live implementation method handle to
166 // the proxy class to invoke directly. (javac prefers to avoid this
167 // situation by generating bridges in the target class)
168 useImplMethodHandle = (Modifier.isProtected(implInfo.getModifiers()) &&
169 !VerifyAccess.isSamePackage(targetClass, implInfo.getDeclaringClass())) ||
170 implKind == MethodHandleInfo.REF_invokeSpecial ||
171 implKind == MethodHandleInfo.REF_invokeStatic && implClass.isHidden();
172 int parameterCount = factoryType.parameterCount();
173 ClassDesc[] argDescs;
174 MethodTypeDesc constructorTypeDesc;
175 if (parameterCount > 0) {
176 argDescs = new ClassDesc[parameterCount];
177 for (int i = 0; i < parameterCount; i++) {
178 argDescs[i] = classDesc(factoryType.parameterType(i));
179 }
180 constructorTypeDesc = MethodTypeDescImpl.ofValidated(CD_void, argDescs);
181 } else {
182 argDescs = EMPTY_CLASSDESC_ARRAY;
183 constructorTypeDesc = MTD_void;
184 }
185 this.argDescs = argDescs;
186 this.constructorTypeDesc = constructorTypeDesc;
187 }
188
189 private static String argName(int i) {
190 return i < ARG_NAME_CACHE.length ? ARG_NAME_CACHE[i] : "arg$" + (i + 1);
191 }
192
193 private static String lambdaClassName(Class<?> targetClass) {
194 String name = targetClass.getName();
195 if (targetClass.isHidden()) {
196 // use the original class name
197 name = name.replace('/', '_');
198 }
199 return name.replace('.', '/').concat("$$Lambda");
200 }
201
202 /**
203 * Build the CallSite. Generate a class file which implements the functional
204 * interface, define the class, if there are no parameters create an instance
205 * of the class which the CallSite will return, otherwise, generate handles
206 * which will call the class' constructor.
207 *
208 * @return a CallSite, which, when invoked, will return an instance of the
209 * functional interface
210 * @throws LambdaConversionException If properly formed functional interface
211 * is not found
212 */
213 @Override
214 CallSite buildCallSite() throws LambdaConversionException {
215 final Class<?> innerClass = spinInnerClass();
216 if (factoryType.parameterCount() == 0 && disableEagerInitialization) {
217 try {
218 return new ConstantCallSite(caller.findStaticGetter(innerClass, LAMBDA_INSTANCE_FIELD,
219 factoryType.returnType()));
220 } catch (ReflectiveOperationException e) {
221 throw new LambdaConversionException(
222 "Exception finding " + LAMBDA_INSTANCE_FIELD + " static field", e);
223 }
224 } else {
225 try {
226 MethodHandle mh = caller.findConstructor(innerClass, constructorType);
227 if (factoryType.parameterCount() == 0) {
228 // In the case of a non-capturing lambda, we optimize linkage by pre-computing a single instance
229 Object inst = mh.invokeBasic();
230 return new ConstantCallSite(MethodHandles.constant(interfaceClass, inst));
231 } else {
232 return new ConstantCallSite(mh.asType(factoryType));
233 }
234 } catch (ReflectiveOperationException e) {
235 throw new LambdaConversionException("Exception finding constructor", e);
236 } catch (Throwable e) {
237 throw new LambdaConversionException("Exception instantiating lambda object", e);
238 }
239 }
240 }
241
242 /**
243 * Spins the lambda proxy class.
244 *
245 * This first checks if a lambda proxy class can be loaded from CDS archive.
246 * Otherwise, generate the lambda proxy class. If CDS dumping is enabled, it
247 * registers the lambda proxy class for including into the CDS archive.
248 */
249 private Class<?> spinInnerClass() throws LambdaConversionException {
250 // CDS does not handle disableEagerInitialization or useImplMethodHandle
251 if (!disableEagerInitialization && !useImplMethodHandle) {
252 if (CDS.isUsingArchive()) {
253 // load from CDS archive if present
254 Class<?> innerClass = LambdaProxyClassArchive.find(targetClass,
255 interfaceMethodName,
256 factoryType,
257 interfaceMethodType,
258 implementation,
259 dynamicMethodType,
260 isSerializable,
261 altInterfaces,
262 altMethods);
263 if (innerClass != null) return innerClass;
264 }
265
266 // include lambda proxy class in CDS archive at dump time
267 if (CDS.isDumpingArchive()) {
268 Class<?> innerClass = generateInnerClass();
269 LambdaProxyClassArchive.register(targetClass,
270 interfaceMethodName,
271 factoryType,
272 interfaceMethodType,
273 implementation,
274 dynamicMethodType,
275 isSerializable,
276 altInterfaces,
277 altMethods,
278 innerClass);
279 return innerClass;
280 }
281
282 }
283 return generateInnerClass();
284 }
285
286 /**
287 * Generate a class file which implements the functional
288 * interface, define and return the class.
289 *
290 * @return a Class which implements the functional interface
291 * @throws LambdaConversionException If properly formed functional interface
292 * is not found
293 */
294 private Class<?> generateInnerClass() throws LambdaConversionException {
295 List<ClassDesc> interfaces;
296 ClassDesc interfaceDesc = classDesc(interfaceClass);
297 boolean accidentallySerializable = !isSerializable && Serializable.class.isAssignableFrom(interfaceClass);
298 if (altInterfaces.length == 0) {
299 interfaces = List.of(interfaceDesc);
300 } else {
301 // Assure no duplicate interfaces (ClassFormatError)
302 Set<ClassDesc> itfs = LinkedHashSet.newLinkedHashSet(altInterfaces.length + 1);
303 itfs.add(interfaceDesc);
304 for (Class<?> i : altInterfaces) {
305 itfs.add(classDesc(i));
306 accidentallySerializable |= !isSerializable && Serializable.class.isAssignableFrom(i);
307 }
308 interfaces = List.copyOf(itfs);
309 }
310 final boolean finalAccidentallySerializable = accidentallySerializable;
311 final byte[] classBytes = ClassFile.of().build(lambdaClassEntry, pool, new Consumer<ClassBuilder>() {
312 @Override
313 public void accept(ClassBuilder clb) {
314 clb.withFlags(ACC_SUPER | ACC_FINAL | ACC_SYNTHETIC)
315 .withInterfaceSymbols(interfaces);
316 // Generate final fields to be filled in by constructor
317 for (int i = 0; i < argDescs.length; i++) {
318 clb.withField(argName(i), argDescs[i], ACC_PRIVATE | ACC_FINAL);
319 }
320
321 generateConstructor(clb);
322
323 if (factoryType.parameterCount() == 0 && disableEagerInitialization) {
324 generateClassInitializer(clb);
325 }
326
327 // Forward the SAM method
328 clb.withMethodBody(interfaceMethodName,
329 methodDesc(interfaceMethodType),
330 ACC_PUBLIC,
331 forwardingMethod(interfaceMethodType));
332
333 // Forward the bridges
334 if (altMethods != null) {
335 for (MethodType mt : altMethods) {
336 clb.withMethodBody(interfaceMethodName,
337 methodDesc(mt),
338 ACC_PUBLIC | ACC_BRIDGE,
339 forwardingMethod(mt));
340 }
341 }
342
343 if (isSerializable)
344 generateSerializationFriendlyMethods(clb);
345 else if (finalAccidentallySerializable)
346 generateSerializationHostileMethods(clb);
347 }
348 });
349
350 // Define the generated class in this VM.
351
352 try {
353 // this class is linked at the indy callsite; so define a hidden nestmate
354 var classdata = useImplMethodHandle? implementation : null;
355 return caller.makeHiddenClassDefiner(lambdaClassName, classBytes, lambdaProxyClassFileDumper, NESTMATE_CLASS | STRONG_LOADER_LINK)
356 .defineClass(!disableEagerInitialization, classdata);
357
358 } catch (Throwable t) {
359 throw new InternalError(t);
360 }
361 }
362
363 /**
364 * Generate a static field and a static initializer that sets this field to an instance of the lambda
365 */
366 private void generateClassInitializer(ClassBuilder clb) {
367 ClassDesc lambdaTypeDescriptor = classDesc(factoryType.returnType());
368
369 // Generate the static final field that holds the lambda singleton
370 clb.withField(LAMBDA_INSTANCE_FIELD, lambdaTypeDescriptor, ACC_PRIVATE | ACC_STATIC | ACC_FINAL);
371
372 // Instantiate the lambda and store it to the static final field
373 clb.withMethodBody(CLASS_INIT_NAME, MTD_void, ACC_STATIC, new Consumer<>() {
374 @Override
375 public void accept(CodeBuilder cob) {
376 assert factoryType.parameterCount() == 0;
377 cob.new_(lambdaClassEntry)
378 .dup()
379 .invokespecial(pool.methodRefEntry(lambdaClassEntry, pool.nameAndTypeEntry(INIT_NAME, constructorTypeDesc)))
380 .putstatic(pool.fieldRefEntry(lambdaClassEntry, pool.nameAndTypeEntry(LAMBDA_INSTANCE_FIELD, lambdaTypeDescriptor)))
381 .return_();
382 }
383 });
384 }
385
386 /**
387 * Generate the constructor for the class
388 */
389 private void generateConstructor(ClassBuilder clb) {
390 // Generate constructor
391 clb.withMethodBody(INIT_NAME, constructorTypeDesc, ACC_PRIVATE,
392 new Consumer<>() {
393 @Override
394 public void accept(CodeBuilder cob) {
395 cob.aload(0)
396 .invokespecial(CD_Object, INIT_NAME, MTD_void);
397 int parameterCount = factoryType.parameterCount();
398 for (int i = 0; i < parameterCount; i++) {
399 cob.aload(0)
400 .loadLocal(TypeKind.from(factoryType.parameterType(i)), cob.parameterSlot(i))
401 .putfield(pool.fieldRefEntry(lambdaClassEntry, pool.nameAndTypeEntry(argName(i), argDescs[i])));
402 }
403 cob.return_();
404 }
405 });
406 }
407
408 private static class SerializationSupport {
409 // Serialization support
410 private static final ClassDesc CD_SerializedLambda = ReferenceClassDescImpl.ofValidated("Ljava/lang/invoke/SerializedLambda;");
411 private static final ClassDesc CD_ObjectOutputStream = ReferenceClassDescImpl.ofValidated("Ljava/io/ObjectOutputStream;");
412 private static final ClassDesc CD_ObjectInputStream = ReferenceClassDescImpl.ofValidated("Ljava/io/ObjectInputStream;");
413 private static final MethodTypeDesc MTD_Object = MethodTypeDescImpl.ofValidated(CD_Object);
414 private static final MethodTypeDesc MTD_void_ObjectOutputStream = MethodTypeDescImpl.ofValidated(CD_void, CD_ObjectOutputStream);
415 private static final MethodTypeDesc MTD_void_ObjectInputStream = MethodTypeDescImpl.ofValidated(CD_void, CD_ObjectInputStream);
416
417 private static final String NAME_METHOD_WRITE_REPLACE = "writeReplace";
418 private static final String NAME_METHOD_READ_OBJECT = "readObject";
419 private static final String NAME_METHOD_WRITE_OBJECT = "writeObject";
420
421 static final ClassDesc CD_NotSerializableException = ReferenceClassDescImpl.ofValidated("Ljava/io/NotSerializableException;");
422 static final MethodTypeDesc MTD_CTOR_NOT_SERIALIZABLE_EXCEPTION = MethodTypeDescImpl.ofValidated(CD_void, CD_String);
423 static final MethodTypeDesc MTD_CTOR_SERIALIZED_LAMBDA = MethodTypeDescImpl.ofValidated(CD_void,
424 CD_Class, CD_String, CD_String, CD_String, CD_int, CD_String, CD_String, CD_String, CD_String, ReferenceClassDescImpl.ofValidated("[Ljava/lang/Object;"));
425
426 }
427
428 /**
429 * Generate a writeReplace method that supports serialization
430 */
431 private void generateSerializationFriendlyMethods(ClassBuilder clb) {
432 clb.withMethodBody(SerializationSupport.NAME_METHOD_WRITE_REPLACE, SerializationSupport.MTD_Object, ACC_PRIVATE | ACC_FINAL,
433 new Consumer<>() {
434 @Override
435 public void accept(CodeBuilder cob) {
436 cob.new_(SerializationSupport.CD_SerializedLambda)
437 .dup()
438 .ldc(classDesc(targetClass))
439 .ldc(factoryType.returnType().getName().replace('.', '/'))
440 .ldc(interfaceMethodName)
441 .ldc(interfaceMethodType.toMethodDescriptorString())
442 .ldc(implInfo.getReferenceKind())
443 .ldc(implInfo.getDeclaringClass().getName().replace('.', '/'))
444 .ldc(implInfo.getName())
445 .ldc(implInfo.getMethodType().toMethodDescriptorString())
446 .ldc(dynamicMethodType.toMethodDescriptorString())
447 .loadConstant(argDescs.length)
448 .anewarray(CD_Object);
449 for (int i = 0; i < argDescs.length; i++) {
450 cob.dup()
451 .loadConstant(i)
452 .aload(0)
453 .getfield(pool.fieldRefEntry(lambdaClassEntry, pool.nameAndTypeEntry(argName(i), argDescs[i])));
454 TypeConvertingMethodAdapter.boxIfTypePrimitive(cob, TypeKind.from(argDescs[i]));
455 cob.aastore();
456 }
457 cob.invokespecial(SerializationSupport.CD_SerializedLambda, INIT_NAME,
458 SerializationSupport.MTD_CTOR_SERIALIZED_LAMBDA)
459 .areturn();
460 }
461 });
462 }
463
464 /**
465 * Generate a readObject/writeObject method that is hostile to serialization
466 */
467 private void generateSerializationHostileMethods(ClassBuilder clb) {
468 var hostileMethod = new Consumer<MethodBuilder>() {
469 @Override
470 public void accept(MethodBuilder mb) {
471 ConstantPoolBuilder cp = mb.constantPool();
472 ClassEntry nseCE = cp.classEntry(SerializationSupport.CD_NotSerializableException);
473 mb.with(ExceptionsAttribute.of(nseCE))
474 .withCode(new Consumer<CodeBuilder>() {
475 @Override
476 public void accept(CodeBuilder cob) {
477 cob.new_(nseCE)
478 .dup()
479 .ldc("Non-serializable lambda")
480 .invokespecial(cp.methodRefEntry(nseCE, cp.nameAndTypeEntry(INIT_NAME,
481 SerializationSupport.MTD_CTOR_NOT_SERIALIZABLE_EXCEPTION)))
482 .athrow();
483 }
484 });
485 }
486 };
487 clb.withMethod(SerializationSupport.NAME_METHOD_WRITE_OBJECT, SerializationSupport.MTD_void_ObjectOutputStream,
488 ACC_PRIVATE + ACC_FINAL, hostileMethod);
489 clb.withMethod(SerializationSupport.NAME_METHOD_READ_OBJECT, SerializationSupport.MTD_void_ObjectInputStream,
490 ACC_PRIVATE + ACC_FINAL, hostileMethod);
491 }
492
493 /**
494 * This method generates a method body which calls the lambda implementation
495 * method, converting arguments, as needed.
496 */
497 Consumer<CodeBuilder> forwardingMethod(MethodType methodType) {
498 return new Consumer<>() {
499 @Override
500 public void accept(CodeBuilder cob) {
501 if (implKind == MethodHandleInfo.REF_newInvokeSpecial) {
502 cob.new_(implMethodClassDesc)
503 .dup();
504 }
505 if (useImplMethodHandle) {
506 ConstantPoolBuilder cp = cob.constantPool();
507 cob.ldc(cp.constantDynamicEntry(cp.bsmEntry(cp.methodHandleEntry(BSM_CLASS_DATA), List.of()),
508 cp.nameAndTypeEntry(DEFAULT_NAME, CD_MethodHandle)));
509 }
510 for (int i = 0; i < argDescs.length; i++) {
511 cob.aload(0)
512 .getfield(pool.fieldRefEntry(lambdaClassEntry, pool.nameAndTypeEntry(argName(i), argDescs[i])));
513 }
514
515 convertArgumentTypes(cob, methodType);
516
517 if (useImplMethodHandle) {
518 MethodType mtype = implInfo.getMethodType();
519 if (implKind != MethodHandleInfo.REF_invokeStatic) {
520 mtype = mtype.insertParameterTypes(0, implClass);
521 }
522 cob.invokevirtual(CD_MethodHandle, "invokeExact", methodDesc(mtype));
523 } else {
524 // Invoke the method we want to forward to
525 cob.invoke(invocationOpcode(), implMethodClassDesc, implMethodName, implMethodDesc, implClass.isInterface());
526 }
527 // Convert the return value (if any) and return it
528 // Note: if adapting from non-void to void, the 'return'
529 // instruction will pop the unneeded result
530 Class<?> implReturnClass = implMethodType.returnType();
531 Class<?> samReturnClass = methodType.returnType();
532 TypeConvertingMethodAdapter.convertType(cob, implReturnClass, samReturnClass, samReturnClass);
533 cob.return_(TypeKind.from(samReturnClass));
534 }
535 };
536 }
537
538 private void convertArgumentTypes(CodeBuilder cob, MethodType samType) {
539 int samParametersLength = samType.parameterCount();
540 int captureArity = factoryType.parameterCount();
541 for (int i = 0; i < samParametersLength; i++) {
542 Class<?> argType = samType.parameterType(i);
543 cob.loadLocal(TypeKind.from(argType), cob.parameterSlot(i));
544 TypeConvertingMethodAdapter.convertType(cob, argType, implMethodType.parameterType(captureArity + i), dynamicMethodType.parameterType(i));
545 }
546 }
547
548 private Opcode invocationOpcode() throws InternalError {
549 return switch (implKind) {
550 case MethodHandleInfo.REF_invokeStatic -> Opcode.INVOKESTATIC;
551 case MethodHandleInfo.REF_newInvokeSpecial -> Opcode.INVOKESPECIAL;
552 case MethodHandleInfo.REF_invokeVirtual -> Opcode.INVOKEVIRTUAL;
553 case MethodHandleInfo.REF_invokeInterface -> Opcode.INVOKEINTERFACE;
554 case MethodHandleInfo.REF_invokeSpecial -> Opcode.INVOKESPECIAL;
555 default -> throw new InternalError("Unexpected invocation kind: " + implKind);
556 };
557 }
558
559 static ClassDesc implClassDesc(Class<?> cls) {
560 return cls.isHidden() ? null : ReferenceClassDescImpl.ofValidated(cls.descriptorString());
561 }
562
563 static ClassDesc classDesc(Class<?> cls) {
564 return cls.isPrimitive() ? Wrapper.forPrimitiveType(cls).basicClassDescriptor()
565 : ReferenceClassDescImpl.ofValidated(cls.descriptorString());
566 }
567
568 static MethodTypeDesc methodDesc(MethodType mt) {
569 var params = new ClassDesc[mt.parameterCount()];
570 for (int i = 0; i < params.length; i++) {
571 params[i] = classDesc(mt.parameterType(i));
572 }
573 return MethodTypeDescImpl.ofValidated(classDesc(mt.returnType()), params);
574 }
575 }