1 /*
2 * Copyright (c) 2008, 2020, 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 sun.invoke.util.BytecodeDescriptor;
29 import sun.invoke.util.VerifyAccess;
30
31 import java.lang.reflect.Constructor;
32 import java.lang.reflect.Field;
33 import java.lang.reflect.Member;
34 import java.lang.reflect.Method;
35 import java.lang.reflect.Modifier;
36 import java.util.ArrayList;
37 import java.util.Collections;
38 import java.util.Iterator;
39 import java.util.List;
40 import java.util.Objects;
41
42 import static java.lang.invoke.MethodHandleNatives.Constants.*;
43 import static java.lang.invoke.MethodHandleStatics.newIllegalArgumentException;
44 import static java.lang.invoke.MethodHandleStatics.newInternalError;
45
46 /**
47 * A {@code MemberName} is a compact symbolic datum which fully characterizes
48 * a method or field reference.
49 * A member name refers to a field, method, constructor, or member type.
50 * Every member name has a simple name (a string) and a type (either a Class or MethodType).
51 * A member name may also have a non-null declaring class, or it may be simply
52 * a naked name/type pair.
53 * A member name may also have non-zero modifier flags.
54 * Finally, a member name may be either resolved or unresolved.
55 * If it is resolved, the existence of the named member has been determined by the JVM.
56 * <p>
57 * Whether resolved or not, a member name provides no access rights or
58 * invocation capability to its possessor. It is merely a compact
59 * representation of all symbolic information necessary to link to
60 * and properly use the named member.
61 * <p>
62 * When resolved, a member name's internal implementation may include references to JVM metadata.
63 * This representation is stateless and only descriptive.
64 * It provides no private information and no capability to use the member.
65 * <p>
66 * By contrast, a {@linkplain java.lang.reflect.Method} contains fuller information
67 * about the internals of a method (except its bytecodes) and also
68 * allows invocation. A MemberName is much lighter than a Method,
69 * since it contains about 7 fields to the 16 of Method (plus its sub-arrays),
70 * and those seven fields omit much of the information in Method.
71 * @author jrose
72 */
73 /*non-public*/
74 final class ResolvedMethodName {
75 //@Injected JVM_Method* vmtarget;
76 //@Injected Class<?> vmholder;
77 };
78
79 /*non-public*/
80 final class MemberName implements Member, Cloneable {
81 private Class<?> clazz; // class in which the member is defined
82 private String name; // may be null if not yet materialized
83 private Object type; // may be null if not yet materialized
84 private int flags; // modifier bits; see reflect.Modifier
85 private ResolvedMethodName method; // cached resolved method information
86 //@Injected intptr_t vmindex; // vtable index or offset of resolved member
87 Object resolution; // if null, this guy is resolved
88
89 /** Return the declaring class of this member.
90 * In the case of a bare name and type, the declaring class will be null.
91 */
92 public Class<?> getDeclaringClass() {
93 return clazz;
94 }
95
96 /** Utility method producing the class loader of the declaring class. */
97 public ClassLoader getClassLoader() {
98 return clazz.getClassLoader();
99 }
100
101 /** Return the simple name of this member.
102 * For a type, it is the same as {@link Class#getSimpleName}.
103 * For a method or field, it is the simple name of the member.
104 * For a constructor, it is always {@code "<init>"}.
105 */
106 public String getName() {
107 if (name == null) {
108 expandFromVM();
109 if (name == null) {
110 return null;
111 }
112 }
113 return name;
114 }
115
116 public MethodType getMethodOrFieldType() {
117 if (isInvocable())
118 return getMethodType();
119 if (isGetter())
120 return MethodType.methodType(getFieldType());
121 if (isSetter())
122 return MethodType.methodType(void.class, getFieldType());
123 throw new InternalError("not a method or field: "+this);
124 }
125
126 /** Return the declared type of this member, which
127 * must be a method or constructor.
128 */
129 public MethodType getMethodType() {
130 if (type == null) {
131 expandFromVM();
132 if (type == null) {
133 return null;
134 }
135 }
136 if (!isInvocable()) {
137 throw newIllegalArgumentException("not invocable, no method type");
138 }
139
140 {
141 // Get a snapshot of type which doesn't get changed by racing threads.
142 final Object type = this.type;
143 if (type instanceof MethodType) {
144 return (MethodType) type;
145 }
146 }
147
148 // type is not a MethodType yet. Convert it thread-safely.
149 synchronized (this) {
150 if (type instanceof String sig) {
151 MethodType res = MethodType.fromDescriptor(sig, getClassLoader());
152 type = res;
153 } else if (type instanceof Object[] typeInfo) {
154 Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
155 Class<?> rtype = (Class<?>) typeInfo[0];
156 MethodType res = MethodType.makeImpl(rtype, ptypes, true);
157 type = res;
158 }
159 // Make sure type is a MethodType for racing threads.
160 assert type instanceof MethodType : "bad method type " + type;
161 }
162 return (MethodType) type;
163 }
164
165 /** Return the descriptor of this member, which
166 * must be a method or constructor.
167 */
168 String getMethodDescriptor() {
169 if (type == null) {
170 expandFromVM();
171 if (type == null) {
172 return null;
173 }
174 }
175 if (!isInvocable()) {
176 throw newIllegalArgumentException("not invocable, no method type");
177 }
178
179 // Get a snapshot of type which doesn't get changed by racing threads.
180 final Object type = this.type;
181 if (type instanceof String) {
182 return (String) type;
183 } else {
184 return getMethodType().toMethodDescriptorString();
185 }
186 }
187
188 /** Return the actual type under which this method or constructor must be invoked.
189 * For non-static methods or constructors, this is the type with a leading parameter,
190 * a reference to declaring class. For static methods, it is the same as the declared type.
191 */
192 public MethodType getInvocationType() {
193 MethodType itype = getMethodOrFieldType();
194 Class<?> c = clazz.isPrimitiveClass() ? clazz.asValueType() : clazz; 195 if (isObjectConstructor() && getReferenceKind() == REF_newInvokeSpecial) 196 return itype.changeReturnType(c);
197 if (!isStatic())
198 return itype.insertParameterTypes(0, c);
199 return itype;
200 }
201
202 /** Utility method producing the parameter types of the method type. */
203 public Class<?>[] getParameterTypes() {
204 return getMethodType().parameterArray();
205 }
206
207 /** Utility method producing the return type of the method type. */
208 public Class<?> getReturnType() {
209 return getMethodType().returnType();
210 }
211
212 /** Return the declared type of this member, which
213 * must be a field or type.
214 * If it is a type member, that type itself is returned.
215 */
216 public Class<?> getFieldType() {
217 if (type == null) {
218 expandFromVM();
219 if (type == null) {
220 return null;
221 }
222 }
223 if (isInvocable()) {
224 throw newIllegalArgumentException("not a field or nested class, no simple type");
225 }
226
227 {
228 // Get a snapshot of type which doesn't get changed by racing threads.
229 final Object type = this.type;
230 if (type instanceof Class<?>) {
231 return (Class<?>) type;
232 }
233 }
234
235 // type is not a Class yet. Convert it thread-safely.
236 synchronized (this) {
237 if (type instanceof String sig) {
238 MethodType mtype = MethodType.fromDescriptor("()"+sig, getClassLoader());
239 Class<?> res = mtype.returnType();
240 type = res;
241 }
242 // Make sure type is a Class for racing threads.
243 assert type instanceof Class<?> : "bad field type " + type;
244 }
245 return (Class<?>) type;
246 }
247
248 /** Utility method to produce either the method type or field type of this member. */
249 public Object getType() {
250 return (isInvocable() ? getMethodType() : getFieldType());
251 }
252
253 /** Utility method to produce the signature of this member,
254 * used within the class file format to describe its type.
255 */
256 public String getSignature() {
257 if (type == null) {
258 expandFromVM();
259 if (type == null) {
260 return null;
261 }
262 }
263 if (isInvocable())
264 return BytecodeDescriptor.unparse(getMethodType());
265 else
266 return BytecodeDescriptor.unparse(getFieldType());
267 }
268
269 /** Return the modifier flags of this member.
270 * @see java.lang.reflect.Modifier
271 */
272 public int getModifiers() {
273 return (flags & RECOGNIZED_MODIFIERS);
274 }
275
276 /** Return the reference kind of this member, or zero if none.
277 */
278 public byte getReferenceKind() {
279 return (byte) ((flags >>> MN_REFERENCE_KIND_SHIFT) & MN_REFERENCE_KIND_MASK);
280 }
281 private boolean referenceKindIsConsistent() {
282 byte refKind = getReferenceKind();
283 if (refKind == REF_NONE) return isType();
284 if (isField()) {
285 assert(staticIsConsistent());
286 assert(MethodHandleNatives.refKindIsField(refKind));
287 } else if (isObjectConstructor()) {
288 assert(refKind == REF_newInvokeSpecial || refKind == REF_invokeSpecial);
289 } else if (isMethod()) {
290 assert(staticIsConsistent());
291 assert(MethodHandleNatives.refKindIsMethod(refKind));
292 if (clazz.isInterface())
293 assert(refKind == REF_invokeInterface ||
294 refKind == REF_invokeStatic ||
295 refKind == REF_invokeSpecial ||
296 refKind == REF_invokeVirtual && isObjectPublicMethod());
297 } else {
298 assert(false);
299 }
300 return true;
301 }
302 private boolean isObjectPublicMethod() {
303 if (clazz == Object.class) return true;
304 MethodType mtype = getMethodType();
305 if (name.equals("toString") && mtype.returnType() == String.class && mtype.parameterCount() == 0)
306 return true;
307 if (name.equals("hashCode") && mtype.returnType() == int.class && mtype.parameterCount() == 0)
308 return true;
309 if (name.equals("equals") && mtype.returnType() == boolean.class && mtype.parameterCount() == 1 && mtype.parameterType(0) == Object.class)
310 return true;
311 return false;
312 }
313
314 /*non-public*/
315 boolean referenceKindIsConsistentWith(int originalRefKind) {
316 int refKind = getReferenceKind();
317 if (refKind == originalRefKind) return true;
318 if (getClass().desiredAssertionStatus()) {
319 switch (originalRefKind) {
320 case REF_invokeInterface -> {
321 // Looking up an interface method, can get (e.g.) Object.hashCode
322 assert (refKind == REF_invokeVirtual || refKind == REF_invokeSpecial) : this;
323 }
324 case REF_invokeVirtual, REF_newInvokeSpecial -> {
325 // Looked up a virtual, can get (e.g.) final String.hashCode.
326 assert (refKind == REF_invokeSpecial) : this;
327 }
328 default -> {
329 assert (false) : this + " != " + MethodHandleNatives.refKindName((byte) originalRefKind);
330 }
331 }
332 }
333 return true;
334 }
335 private boolean staticIsConsistent() {
336 byte refKind = getReferenceKind();
337 return MethodHandleNatives.refKindIsStatic(refKind) == isStatic() || getModifiers() == 0;
338 }
339 private boolean vminfoIsConsistent() {
340 byte refKind = getReferenceKind();
341 assert(isResolved()); // else don't call
342 Object vminfo = MethodHandleNatives.getMemberVMInfo(this);
343 assert(vminfo instanceof Object[]);
344 long vmindex = (Long) ((Object[])vminfo)[0];
345 Object vmtarget = ((Object[])vminfo)[1];
346 if (MethodHandleNatives.refKindIsField(refKind)) {
347 assert(vmindex >= 0) : vmindex + ":" + this;
348 assert(vmtarget instanceof Class);
349 } else {
350 if (MethodHandleNatives.refKindDoesDispatch(refKind))
351 assert(vmindex >= 0) : vmindex + ":" + this;
352 else
353 assert(vmindex < 0) : vmindex;
354 assert(vmtarget instanceof MemberName) : vmtarget + " in " + this;
355 }
356 return true;
357 }
358
359 private MemberName changeReferenceKind(byte refKind, byte oldKind) {
360 assert(getReferenceKind() == oldKind);
361 assert(MethodHandleNatives.refKindIsValid(refKind));
362 flags += (((int)refKind - oldKind) << MN_REFERENCE_KIND_SHIFT);
363 return this;
364 }
365
366 private boolean testFlags(int mask, int value) {
367 return (flags & mask) == value;
368 }
369 private boolean testAllFlags(int mask) {
370 return testFlags(mask, mask);
371 }
372 private boolean testAnyFlags(int mask) {
373 return !testFlags(mask, 0);
374 }
375
376 /** Utility method to query if this member is a method handle invocation (invoke or invokeExact).
377 */
378 public boolean isMethodHandleInvoke() {
379 final int bits = MH_INVOKE_MODS &~ Modifier.PUBLIC;
380 final int negs = Modifier.STATIC;
381 if (testFlags(bits | negs, bits) &&
382 clazz == MethodHandle.class) {
383 return isMethodHandleInvokeName(name);
384 }
385 return false;
386 }
387 public static boolean isMethodHandleInvokeName(String name) {
388 switch (name) {
389 case "invoke":
390 case "invokeExact":
391 return true;
392 default:
393 return false;
394 }
395 }
396 public boolean isVarHandleMethodInvoke() {
397 final int bits = MH_INVOKE_MODS &~ Modifier.PUBLIC;
398 final int negs = Modifier.STATIC;
399 if (testFlags(bits | negs, bits) &&
400 clazz == VarHandle.class) {
401 return isVarHandleMethodInvokeName(name);
402 }
403 return false;
404 }
405 public static boolean isVarHandleMethodInvokeName(String name) {
406 try {
407 VarHandle.AccessMode.valueFromMethodName(name);
408 return true;
409 } catch (IllegalArgumentException e) {
410 return false;
411 }
412 }
413 private static final int MH_INVOKE_MODS = Modifier.NATIVE | Modifier.FINAL | Modifier.PUBLIC;
414
415 /** Utility method to query the modifier flags of this member. */
416 public boolean isStatic() {
417 return Modifier.isStatic(flags);
418 }
419 /** Utility method to query the modifier flags of this member. */
420 public boolean isPublic() {
421 return Modifier.isPublic(flags);
422 }
423 /** Utility method to query the modifier flags of this member. */
424 public boolean isPrivate() {
425 return Modifier.isPrivate(flags);
426 }
427 /** Utility method to query the modifier flags of this member. */
428 public boolean isProtected() {
429 return Modifier.isProtected(flags);
430 }
431 /** Utility method to query the modifier flags of this member. */
432 public boolean isFinal() {
433 // all fields declared in a value type are effectively final 434 assert(!clazz.isValue() || !isField() || Modifier.isFinal(flags));
435 return Modifier.isFinal(flags);
436 }
437 /** Utility method to query whether this member or its defining class is final. */
438 public boolean canBeStaticallyBound() {
439 return Modifier.isFinal(flags | clazz.getModifiers());
440 }
441 /** Utility method to query the modifier flags of this member. */
442 public boolean isVolatile() {
443 return Modifier.isVolatile(flags);
444 }
445 /** Utility method to query the modifier flags of this member. */
446 public boolean isAbstract() {
447 return Modifier.isAbstract(flags);
448 }
449 /** Utility method to query the modifier flags of this member. */
450 public boolean isNative() {
451 return Modifier.isNative(flags);
452 }
453 // let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo
454
455 // unofficial modifier flags, used by HotSpot:
456 static final int BRIDGE = 0x00000040; 457 static final int VARARGS = 0x00000080; 458 static final int SYNTHETIC = 0x00001000; 459 static final int ANNOTATION = 0x00002000; 460 static final int ENUM = 0x00004000; 461
462 /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
463 public boolean isBridge() {
464 return testAllFlags(IS_METHOD | BRIDGE);
465 }
466 /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
467 public boolean isVarargs() {
468 return testAllFlags(VARARGS) && isInvocable();
469 }
470 /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
471 public boolean isSynthetic() {
472 return testAllFlags(SYNTHETIC);
473 }
474
475 /** Query whether this member is a flattened field */ 476 public boolean isFlattened() { return (flags & MN_FLATTENED) == MN_FLATTENED; } 477 478 /** Query whether this member is a field of a primitive class. */ 479 public boolean isInlineableField() { 480 if (isField()) { 481 Class<?> type = getFieldType(); 482 return type.isPrimitiveValueType() || (type.isValue() && !type.isPrimitiveClass()); 483 } 484 return false; 485 } 486
487 static final String CONSTRUCTOR_NAME = "<init>"; // the ever-popular
488
489 // modifiers exported by the JVM:
490 // modifiers exported by the JVM:
491 static final int RECOGNIZED_MODIFIERS = 0xFFFF;
492
493 // private flags, not part of RECOGNIZED_MODIFIERS:
494 static final int
495 IS_METHOD = MN_IS_METHOD, // method (not object constructor) 496 IS_OBJECT_CONSTRUCTOR = MN_IS_OBJECT_CONSTRUCTOR, // object constructor 497 IS_FIELD = MN_IS_FIELD, // field 498 IS_TYPE = MN_IS_TYPE, // nested type 499 CALLER_SENSITIVE = MN_CALLER_SENSITIVE, // @CallerSensitive annotation detected 500 TRUSTED_FINAL = MN_TRUSTED_FINAL; // trusted final field
501
502 static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
503 static final int ALL_KINDS = IS_METHOD | IS_OBJECT_CONSTRUCTOR | IS_FIELD | IS_TYPE; 504 static final int IS_INVOCABLE = IS_METHOD | IS_OBJECT_CONSTRUCTOR;
505 static final int IS_FIELD_OR_METHOD = IS_METHOD | IS_FIELD;
506 static final int SEARCH_ALL_SUPERS = MN_SEARCH_SUPERCLASSES | MN_SEARCH_INTERFACES;
507
508 /** Utility method to query whether this member is a method or constructor. */
509 public boolean isInvocable() {
510 return testAnyFlags(IS_INVOCABLE);
511 }
512 /** Utility method to query whether this member is a method, constructor, or field. */
513 public boolean isFieldOrMethod() {
514 return testAnyFlags(IS_FIELD_OR_METHOD);
515 }
516 /** Query whether this member is a method. */
517 public boolean isMethod() {
518 return testAllFlags(IS_METHOD);
519 }
520 /** Query whether this member is a constructor. */
521 public boolean isObjectConstructor() { 522 return testAllFlags(IS_OBJECT_CONSTRUCTOR); 523 } 524 /** Query whether this member is an object constructor or static <init> factory */ 525 public boolean isObjectConstructorOrStaticInitMethod() { 526 return isObjectConstructor() || (getName().equals(CONSTRUCTOR_NAME) && testAllFlags(IS_METHOD));
527 }
528 /** Query whether this member is a field. */
529 public boolean isField() {
530 return testAllFlags(IS_FIELD);
531 }
532 /** Query whether this member is a type. */
533 public boolean isType() {
534 return testAllFlags(IS_TYPE);
535 }
536 /** Utility method to query whether this member is neither public, private, nor protected. */
537 public boolean isPackage() {
538 return !testAnyFlags(ALL_ACCESS);
539 }
540 /** Query whether this member has a CallerSensitive annotation. */
541 public boolean isCallerSensitive() {
542 return testAllFlags(CALLER_SENSITIVE);
543 }
544 /** Query whether this member is a trusted final field. */
545 public boolean isTrustedFinalField() { return testAllFlags(TRUSTED_FINAL|IS_FIELD); }
546
547 /** Utility method to query whether this member is accessible from a given lookup class. */
548 public boolean isAccessibleFrom(Class<?> lookupClass) {
549 int mode = (ALL_ACCESS|MethodHandles.Lookup.PACKAGE|MethodHandles.Lookup.MODULE);
550 return VerifyAccess.isMemberAccessible(this.getDeclaringClass(), this.getDeclaringClass(), flags,
551 lookupClass, null, mode);
552 }
553
554 /**
555 * Check if MemberName is a call to a method named {@code name} in class {@code declaredClass}.
556 */
557 public boolean refersTo(Class<?> declc, String n) {
558 return clazz == declc && getName().equals(n);
559 }
560
561 /** Initialize a query. It is not resolved. */
562 private void init(Class<?> defClass, String name, Object type, int flags) {
563 // defining class is allowed to be null (for a naked name/type pair)
564 //name.toString(); // null check
565 //type.equals(type); // null check
566 // fill in fields:
567 this.clazz = defClass;
568 this.name = name;
569 this.type = type;
570 this.flags = flags;
571 assert(testAnyFlags(ALL_KINDS));
572 assert(this.resolution == null); // nobody should have touched this yet
573 //assert(referenceKindIsConsistent()); // do this after resolution
574 }
575
576 /**
577 * Calls down to the VM to fill in the fields. This method is
578 * synchronized to avoid racing calls.
579 */
580 private void expandFromVM() {
581 if (type != null) {
582 return;
583 }
584 if (!isResolved()) {
585 return;
586 }
587 MethodHandleNatives.expand(this);
588 }
589
590 // Capturing information from the Core Reflection API:
591 private static int flagsMods(int flags, int mods, byte refKind) {
592 assert((flags & RECOGNIZED_MODIFIERS) == 0);
593 assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
594 assert((refKind & ~MN_REFERENCE_KIND_MASK) == 0);
595 return flags | mods | (refKind << MN_REFERENCE_KIND_SHIFT);
596 }
597 /** Create a name for the given reflected method. The resulting name will be in a resolved state. */
598 public MemberName(Method m) {
599 this(m, false);
600 }
601 @SuppressWarnings("LeakingThisInConstructor")
602 public MemberName(Method m, boolean wantSpecial) {
603 Objects.requireNonNull(m);
604 // fill in vmtarget, vmindex while we have m in hand:
605 MethodHandleNatives.init(this, m);
606 if (clazz == null) { // MHN.init failed
607 if (m.getDeclaringClass() == MethodHandle.class &&
608 isMethodHandleInvokeName(m.getName())) {
609 // The JVM did not reify this signature-polymorphic instance.
610 // Need a special case here.
611 // See comments on MethodHandleNatives.linkMethod.
612 MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
613 int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
614 init(MethodHandle.class, m.getName(), type, flags);
615 if (isMethodHandleInvoke())
616 return;
617 }
618 if (m.getDeclaringClass() == VarHandle.class &&
619 isVarHandleMethodInvokeName(m.getName())) {
620 // The JVM did not reify this signature-polymorphic instance.
621 // Need a special case here.
622 // See comments on MethodHandleNatives.linkMethod.
623 MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
624 int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
625 init(VarHandle.class, m.getName(), type, flags);
626 if (isVarHandleMethodInvoke())
627 return;
628 }
629 throw new LinkageError(m.toString());
630 }
631 assert(isResolved() && this.clazz != null);
632 this.name = m.getName();
633 if (this.type == null)
634 this.type = new Object[] { m.getReturnType(), m.getParameterTypes() };
635 if (wantSpecial) {
636 if (isAbstract())
637 throw new AbstractMethodError(this.toString());
638 if (getReferenceKind() == REF_invokeVirtual)
639 changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
640 else if (getReferenceKind() == REF_invokeInterface)
641 // invokeSpecial on a default method
642 changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
643 }
644 }
645 public MemberName asSpecial() {
646 switch (getReferenceKind()) {
647 case REF_invokeSpecial: return this;
648 case REF_invokeVirtual: return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
649 case REF_invokeInterface: return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
650 case REF_newInvokeSpecial: return clone().changeReferenceKind(REF_invokeSpecial, REF_newInvokeSpecial);
651 }
652 throw new IllegalArgumentException(this.toString());
653 }
654 /** If this MN is not REF_newInvokeSpecial, return a clone with that ref. kind.
655 * In that case it must already be REF_invokeSpecial.
656 */
657 public MemberName asObjectConstructor() {
658 switch (getReferenceKind()) {
659 case REF_invokeSpecial: return clone().changeReferenceKind(REF_newInvokeSpecial, REF_invokeSpecial);
660 case REF_newInvokeSpecial: return this;
661 }
662 throw new IllegalArgumentException(this.toString());
663 }
664 /** If this MN is a REF_invokeSpecial, return a clone with the "normal" kind
665 * REF_invokeVirtual; also switch either to REF_invokeInterface if clazz.isInterface.
666 * The end result is to get a fully virtualized version of the MN.
667 * (Note that resolving in the JVM will sometimes devirtualize, changing
668 * REF_invokeVirtual of a final to REF_invokeSpecial, and REF_invokeInterface
669 * in some corner cases to either of the previous two; this transform
670 * undoes that change under the assumption that it occurred.)
671 */
672 public MemberName asNormalOriginal() {
673 byte normalVirtual = clazz.isInterface() ? REF_invokeInterface : REF_invokeVirtual;
674 byte refKind = getReferenceKind();
675 byte newRefKind = refKind;
676 MemberName result = this;
677 switch (refKind) {
678 case REF_invokeInterface:
679 case REF_invokeVirtual:
680 case REF_invokeSpecial:
681 newRefKind = normalVirtual;
682 break;
683 }
684 if (newRefKind == refKind)
685 return this;
686 result = clone().changeReferenceKind(newRefKind, refKind);
687 assert(this.referenceKindIsConsistentWith(result.getReferenceKind()));
688 return result;
689 }
690 /** Create a name for the given reflected constructor. The resulting name will be in a resolved state. */
691 @SuppressWarnings("LeakingThisInConstructor")
692 public MemberName(Constructor<?> ctor) {
693 Objects.requireNonNull(ctor);
694 // fill in vmtarget, vmindex while we have ctor in hand:
695 MethodHandleNatives.init(this, ctor);
696 assert(isResolved() && this.clazz != null);
697 this.name = CONSTRUCTOR_NAME;
698 if (this.type == null) { 699 Class<?> rtype = void.class; 700 if (isStatic()) { // a static init factory, not a true constructor 701 rtype = getDeclaringClass(); 702 // FIXME: If it's a hidden class, this sig won't work. 703 } 704 this.type = new Object[] { rtype, ctor.getParameterTypes() }; 705 }
706 }
707 /** Create a name for the given reflected field. The resulting name will be in a resolved state.
708 */
709 public MemberName(Field fld) {
710 this(fld, false);
711 }
712 @SuppressWarnings("LeakingThisInConstructor")
713 public MemberName(Field fld, boolean makeSetter) {
714 Objects.requireNonNull(fld);
715 // fill in vmtarget, vmindex while we have fld in hand:
716 MethodHandleNatives.init(this, fld);
717 assert(isResolved() && this.clazz != null);
718 this.name = fld.getName();
719 this.type = fld.getType();
720 assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
721 byte refKind = this.getReferenceKind();
722 assert(refKind == (isStatic() ? REF_getStatic : REF_getField));
723 if (makeSetter) {
724 changeReferenceKind((byte)(refKind + (REF_putStatic - REF_getStatic)), refKind);
725 }
726 }
727 public boolean isGetter() {
728 return MethodHandleNatives.refKindIsGetter(getReferenceKind());
729 }
730 public boolean isSetter() {
731 return MethodHandleNatives.refKindIsSetter(getReferenceKind());
732 }
733 public MemberName asSetter() {
734 byte refKind = getReferenceKind();
735 assert(MethodHandleNatives.refKindIsGetter(refKind));
736 assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
737 byte setterRefKind = (byte)(refKind + (REF_putField - REF_getField));
738 return clone().changeReferenceKind(setterRefKind, refKind);
739 }
740 /** Create a name for the given class. The resulting name will be in a resolved state. */
741 public MemberName(Class<?> type) {
742 init(type.getDeclaringClass(), type.getSimpleName(), type,
743 flagsMods(IS_TYPE, type.getModifiers(), REF_NONE));
744 initResolved(true);
745 }
746
747 /**
748 * Create a name for a signature-polymorphic invoker.
749 * This is a placeholder for a signature-polymorphic instance
750 * (of MH.invokeExact, etc.) that the JVM does not reify.
751 * See comments on {@link MethodHandleNatives#linkMethod}.
752 */
753 static MemberName makeMethodHandleInvoke(String name, MethodType type) {
754 return makeMethodHandleInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
755 }
756 static MemberName makeMethodHandleInvoke(String name, MethodType type, int mods) {
757 MemberName mem = new MemberName(MethodHandle.class, name, type, REF_invokeVirtual);
758 mem.flags |= mods; // it's not resolved, but add these modifiers anyway
759 assert(mem.isMethodHandleInvoke()) : mem;
760 return mem;
761 }
762
763 static MemberName makeVarHandleMethodInvoke(String name, MethodType type) {
764 return makeVarHandleMethodInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
765 }
766 static MemberName makeVarHandleMethodInvoke(String name, MethodType type, int mods) {
767 MemberName mem = new MemberName(VarHandle.class, name, type, REF_invokeVirtual);
768 mem.flags |= mods; // it's not resolved, but add these modifiers anyway
769 assert(mem.isVarHandleMethodInvoke()) : mem;
770 return mem;
771 }
772
773 // bare-bones constructor; the JVM will fill it in
774 MemberName() { }
775
776 // locally useful cloner
777 @Override protected MemberName clone() {
778 try {
779 return (MemberName) super.clone();
780 } catch (CloneNotSupportedException ex) {
781 throw newInternalError(ex);
782 }
783 }
784
785 /** Get the definition of this member name.
786 * This may be in a super-class of the declaring class of this member.
787 */
788 public MemberName getDefinition() {
789 if (!isResolved()) throw new IllegalStateException("must be resolved: "+this);
790 if (isType()) return this;
791 MemberName res = this.clone();
792 res.clazz = null;
793 res.type = null;
794 res.name = null;
795 res.resolution = res;
796 res.expandFromVM();
797 assert(res.getName().equals(this.getName()));
798 return res;
799 }
800
801 @Override
802 @SuppressWarnings({"deprecation", "removal"})
803 public int hashCode() {
804 // Avoid autoboxing getReferenceKind(), since this is used early and will force
805 // early initialization of Byte$ByteCache
806 return Objects.hash(clazz, new Byte(getReferenceKind()), name, getType());
807 }
808
809 @Override
810 public boolean equals(Object that) {
811 return (that instanceof MemberName && this.equals((MemberName)that));
812 }
813
814 /** Decide if two member names have exactly the same symbolic content.
815 * Does not take into account any actual class members, so even if
816 * two member names resolve to the same actual member, they may
817 * be distinct references.
818 */
819 public boolean equals(MemberName that) {
820 if (this == that) return true;
821 if (that == null) return false;
822 return this.clazz == that.clazz
823 && this.getReferenceKind() == that.getReferenceKind()
824 && Objects.equals(this.name, that.name)
825 && Objects.equals(this.getType(), that.getType());
826 }
827
828 // Construction from symbolic parts, for queries:
829 /** Create a field or type name from the given components:
830 * Declaring class, name, type, reference kind.
831 * The declaring class may be supplied as null if this is to be a bare name and type.
832 * The resulting name will in an unresolved state.
833 */
834 public MemberName(Class<?> defClass, String name, Class<?> type, byte refKind) {
835 init(defClass, name, type, flagsMods(IS_FIELD, 0, refKind));
836 initResolved(false);
837 }
838 /** Create a method or constructor name from the given components:
839 * Declaring class, name, type, reference kind.
840 * It will be a constructor if and only if the name is {@code "<init>"}.
841 * The declaring class may be supplied as null if this is to be a bare name and type.
842 * The last argument is optional, a boolean which requests REF_invokeSpecial.
843 * The resulting name will in an unresolved state.
844 */
845 public MemberName(Class<?> defClass, String name, MethodType type, byte refKind) {
846 int initFlags = (name != null && name.equals(CONSTRUCTOR_NAME) && type.returnType() == void.class ? IS_OBJECT_CONSTRUCTOR : IS_METHOD);
847 init(defClass, name, type, flagsMods(initFlags, 0, refKind));
848 initResolved(false);
849 }
850 /** Create a method, constructor, or field name from the given components:
851 * Reference kind, declaring class, name, type.
852 */
853 public MemberName(byte refKind, Class<?> defClass, String name, Object type) {
854 int kindFlags;
855 if (MethodHandleNatives.refKindIsField(refKind)) {
856 kindFlags = IS_FIELD;
857 if (!(type instanceof Class))
858 throw newIllegalArgumentException("not a field type");
859 } else if (MethodHandleNatives.refKindIsMethod(refKind)) {
860 kindFlags = IS_METHOD;
861 if (!(type instanceof MethodType))
862 throw newIllegalArgumentException("not a method type");
863 } else if (refKind == REF_newInvokeSpecial) {
864 kindFlags = IS_OBJECT_CONSTRUCTOR;
865 if (!(type instanceof MethodType) ||
866 !CONSTRUCTOR_NAME.equals(name))
867 throw newIllegalArgumentException("not a constructor type or name");
868 } else {
869 throw newIllegalArgumentException("bad reference kind "+refKind);
870 }
871 init(defClass, name, type, flagsMods(kindFlags, 0, refKind));
872 initResolved(false);
873 }
874 /** Query whether this member name is resolved to a non-static, non-final method.
875 */
876 public boolean hasReceiverTypeDispatch() {
877 return MethodHandleNatives.refKindDoesDispatch(getReferenceKind());
878 }
879
880 /** Query whether this member name is resolved.
881 * A resolved member name is one for which the JVM has found
882 * a method, constructor, field, or type binding corresponding exactly to the name.
883 * (Document?)
884 */
885 public boolean isResolved() {
886 return resolution == null;
887 }
888
889 void initResolved(boolean isResolved) {
890 assert(this.resolution == null); // not initialized yet!
891 if (!isResolved)
892 this.resolution = this;
893 assert(isResolved() == isResolved);
894 }
895
896 void checkForTypeAlias(Class<?> refc) {
897 if (isInvocable()) {
898 MethodType type;
899 if (this.type instanceof MethodType)
900 type = (MethodType) this.type;
901 else
902 this.type = type = getMethodType();
903 if (type.erase() == type) return;
904 if (VerifyAccess.isTypeVisible(type, refc)) return;
905 throw new LinkageError("bad method type alias: "+type+" not visible from "+refc);
906 } else {
907 Class<?> type;
908 if (this.type instanceof Class<?>)
909 type = (Class<?>) this.type;
910 else
911 this.type = type = getFieldType();
912 if (VerifyAccess.isTypeVisible(type, refc)) return;
913 throw new LinkageError("bad field type alias: "+type+" not visible from "+refc);
914 }
915 }
916
917
918 /** Produce a string form of this member name.
919 * For types, it is simply the type's own string (as reported by {@code toString}).
920 * For fields, it is {@code "DeclaringClass.name/type"}.
921 * For methods and constructors, it is {@code "DeclaringClass.name(ptype...)rtype"}.
922 * If the declaring class is null, the prefix {@code "DeclaringClass."} is omitted.
923 * If the member is unresolved, a prefix {@code "*."} is prepended.
924 */
925 @SuppressWarnings("LocalVariableHidesMemberVariable")
926 @Override
927 public String toString() {
928 if (isType())
929 return type.toString(); // class java.lang.String
930 // else it is a field, method, or constructor
931 StringBuilder buf = new StringBuilder();
932 if (getDeclaringClass() != null) {
933 buf.append(getName(clazz));
934 buf.append('.');
935 }
936 String name = this.name; // avoid expanding from VM
937 buf.append(name == null ? "*" : name);
938 Object type = this.type; // avoid expanding from VM
939 if (!isInvocable()) {
940 buf.append('/');
941 buf.append(type == null ? "*" : getName(type));
942 } else {
943 buf.append(type == null ? "(*)*" : getName(type));
944 }
945 byte refKind = getReferenceKind();
946 if (refKind != REF_NONE) {
947 buf.append('/');
948 buf.append(MethodHandleNatives.refKindName(refKind));
949 }
950 //buf.append("#").append(System.identityHashCode(this));
951 return buf.toString();
952 }
953 private static String getName(Object obj) {
954 if (obj instanceof Class<?>)
955 return ((Class<?>)obj).getName();
956 return String.valueOf(obj);
957 }
958
959 public IllegalAccessException makeAccessException(String message, Object from) {
960 message = message + ": "+ toString();
961 if (from != null) {
962 if (from == MethodHandles.publicLookup()) {
963 message += ", from public Lookup";
964 } else {
965 Module m;
966 Class<?> plc;
967 if (from instanceof MethodHandles.Lookup lookup) {
968 from = lookup.lookupClass();
969 m = lookup.lookupClass().getModule();
970 plc = lookup.previousLookupClass();
971 } else {
972 m = ((Class<?>)from).getModule();
973 plc = null;
974 }
975 message += ", from " + from + " (" + m + ")";
976 if (plc != null) {
977 message += ", previous lookup " +
978 plc.getName() + " (" + plc.getModule() + ")";
979 }
980 }
981 }
982 return new IllegalAccessException(message);
983 }
984 private String message() {
985 if (isResolved())
986 return "no access";
987 else if (isObjectConstructor())
988 return "no such constructor";
989 else if (isMethod())
990 return "no such method";
991 else
992 return "no such field";
993 }
994 public ReflectiveOperationException makeAccessException() {
995 String message = message() + ": "+ toString();
996 ReflectiveOperationException ex;
997 if (isResolved() || !(resolution instanceof NoSuchMethodError ||
998 resolution instanceof NoSuchFieldError))
999 ex = new IllegalAccessException(message);
1000 else if (isObjectConstructor())
1001 ex = new NoSuchMethodException(message);
1002 else if (isMethod())
1003 ex = new NoSuchMethodException(message);
1004 else
1005 ex = new NoSuchFieldException(message);
1006 if (resolution instanceof Throwable)
1007 ex.initCause((Throwable) resolution);
1008 return ex;
1009 }
1010
1011 /** Actually making a query requires an access check. */
1012 /*non-public*/
1013 static Factory getFactory() {
1014 return Factory.INSTANCE;
1015 }
1016 /** A factory type for resolving member names with the help of the VM.
1017 * TBD: Define access-safe public constructors for this factory.
1018 */
1019 /*non-public*/
1020 static class Factory {
1021 private Factory() { } // singleton pattern
1022 static Factory INSTANCE = new Factory();
1023
1024 private static int ALLOWED_FLAGS = ALL_KINDS;
1025
1026 /// Queries
1027 List<MemberName> getMembers(Class<?> defc,
1028 String matchName, Object matchType,
1029 int matchFlags, Class<?> lookupClass) {
1030 matchFlags &= ALLOWED_FLAGS;
1031 String matchSig = null;
1032 if (matchType != null) {
1033 matchSig = BytecodeDescriptor.unparse(matchType);
1034 if (matchSig.startsWith("("))
1035 matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
1036 else
1037 matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
1038 }
1039 final int BUF_MAX = 0x2000;
1040 int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
1041 MemberName[] buf = newMemberBuffer(len1);
1042 int totalCount = 0;
1043 ArrayList<MemberName[]> bufs = null;
1044 int bufCount = 0;
1045 for (;;) {
1046 bufCount = MethodHandleNatives.getMembers(defc,
1047 matchName, matchSig, matchFlags,
1048 lookupClass,
1049 totalCount, buf);
1050 if (bufCount <= buf.length) {
1051 if (bufCount < 0) bufCount = 0;
1052 totalCount += bufCount;
1053 break;
1054 }
1055 // JVM returned to us with an intentional overflow!
1056 totalCount += buf.length;
1057 int excess = bufCount - buf.length;
1058 if (bufs == null) bufs = new ArrayList<>(1);
1059 bufs.add(buf);
1060 int len2 = buf.length;
1061 len2 = Math.max(len2, excess);
1062 len2 = Math.max(len2, totalCount / 4);
1063 buf = newMemberBuffer(Math.min(BUF_MAX, len2));
1064 }
1065 ArrayList<MemberName> result = new ArrayList<>(totalCount);
1066 if (bufs != null) {
1067 for (MemberName[] buf0 : bufs) {
1068 Collections.addAll(result, buf0);
1069 }
1070 }
1071 for (int i = 0; i < bufCount; i++) {
1072 result.add(buf[i]);
1073 }
1074 // Signature matching is not the same as type matching, since
1075 // one signature might correspond to several types.
1076 // So if matchType is a Class or MethodType, refilter the results.
1077 if (matchType != null && matchType != matchSig) {
1078 for (Iterator<MemberName> it = result.iterator(); it.hasNext();) {
1079 MemberName m = it.next();
1080 if (!matchType.equals(m.getType()))
1081 it.remove();
1082 }
1083 }
1084 return result;
1085 }
1086 /** Produce a resolved version of the given member.
1087 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1088 * Access checking is performed on behalf of the given {@code lookupClass}.
1089 * If lookup fails or access is not permitted, null is returned.
1090 * Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1091 */
1092 private MemberName resolve(byte refKind, MemberName ref, Class<?> lookupClass, int allowedModes,
1093 boolean speculativeResolve) {
1094 MemberName m = ref.clone(); // JVM will side-effect the ref
1095 assert(refKind == m.getReferenceKind());
1096 try {
1097 // There are 4 entities in play here:
1098 // * LC: lookupClass
1099 // * REFC: symbolic reference class (MN.clazz before resolution);
1100 // * DEFC: resolved method holder (MN.clazz after resolution);
1101 // * PTYPES: parameter types (MN.type)
1102 //
1103 // What we care about when resolving a MemberName is consistency between DEFC and PTYPES.
1104 // We do type alias (TA) checks on DEFC to ensure that. DEFC is not known until the JVM
1105 // finishes the resolution, so do TA checks right after MHN.resolve() is over.
1106 //
1107 // All parameters passed by a caller are checked against MH type (PTYPES) on every invocation,
1108 // so it is safe to call a MH from any context.
1109 //
1110 // REFC view on PTYPES doesn't matter, since it is used only as a starting point for resolution and doesn't
1111 // participate in method selection.
1112 m = MethodHandleNatives.resolve(m, lookupClass, allowedModes, speculativeResolve);
1113 if (m == null && speculativeResolve) {
1114 return null;
1115 }
1116 m.checkForTypeAlias(m.getDeclaringClass());
1117 m.resolution = null;
1118 } catch (ClassNotFoundException | LinkageError ex) {
1119 // JVM reports that the "bytecode behavior" would get an error
1120 assert(!m.isResolved());
1121 m.resolution = ex;
1122 return m;
1123 }
1124 assert(m.referenceKindIsConsistent());
1125 m.initResolved(true);
1126 assert(m.vminfoIsConsistent());
1127 return m;
1128 }
1129 /** Produce a resolved version of the given member.
1130 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1131 * Access checking is performed on behalf of the given {@code lookupClass}.
1132 * If lookup fails or access is not permitted, a {@linkplain ReflectiveOperationException} is thrown.
1133 * Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1134 */
1135 public <NoSuchMemberException extends ReflectiveOperationException>
1136 MemberName resolveOrFail(byte refKind, MemberName m,
1137 Class<?> lookupClass, int allowedModes,
1138 Class<NoSuchMemberException> nsmClass)
1139 throws IllegalAccessException, NoSuchMemberException {
1140 assert lookupClass != null || allowedModes == LM_TRUSTED;
1141 MemberName result = resolve(refKind, m, lookupClass, allowedModes, false);
1142 if (result.isResolved())
1143 return result;
1144 ReflectiveOperationException ex = result.makeAccessException();
1145 if (ex instanceof IllegalAccessException) throw (IllegalAccessException) ex;
1146 throw nsmClass.cast(ex);
1147 }
1148 /** Produce a resolved version of the given member.
1149 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1150 * Access checking is performed on behalf of the given {@code lookupClass}.
1151 * If lookup fails or access is not permitted, return null.
1152 * Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1153 */
1154 public MemberName resolveOrNull(byte refKind, MemberName m, Class<?> lookupClass, int allowedModes) {
1155 assert lookupClass != null || allowedModes == LM_TRUSTED;
1156 MemberName result = resolve(refKind, m, lookupClass, allowedModes, true);
1157 if (result != null && result.isResolved())
1158 return result;
1159 return null;
1160 }
1161 /** Return a list of all methods defined by the given class.
1162 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1163 * Access checking is performed on behalf of the given {@code lookupClass}.
1164 * Inaccessible members are not added to the last.
1165 */
1166 public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
1167 Class<?> lookupClass) {
1168 return getMethods(defc, searchSupers, null, null, lookupClass);
1169 }
1170 /** Return a list of matching methods defined by the given class.
1171 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1172 * Returned methods will match the name (if not null) and the type (if not null).
1173 * Access checking is performed on behalf of the given {@code lookupClass}.
1174 * Inaccessible members are not added to the last.
1175 */
1176 public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
1177 String name, MethodType type, Class<?> lookupClass) {
1178 int matchFlags = IS_METHOD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1179 return getMembers(defc, name, type, matchFlags, lookupClass);
1180 }
1181 /** Return a list of all object constructors defined by the given class.
1182 * Access checking is performed on behalf of the given {@code lookupClass}.
1183 * Inaccessible members are not added to the last.
1184 */
1185 public List<MemberName> getObjectConstructors(Class<?> defc, Class<?> lookupClass) {1186 return getMembers(defc, null, null, IS_OBJECT_CONSTRUCTOR, lookupClass);
1187 }
1188 /** Return a list of all fields defined by the given class.
1189 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1190 * Access checking is performed on behalf of the given {@code lookupClass}.
1191 * Inaccessible members are not added to the last.
1192 */
1193 public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
1194 Class<?> lookupClass) {
1195 return getFields(defc, searchSupers, null, null, lookupClass);
1196 }
1197 /** Return a list of all fields defined by the given class.
1198 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1199 * Returned fields will match the name (if not null) and the type (if not null).
1200 * Access checking is performed on behalf of the given {@code lookupClass}.
1201 * Inaccessible members are not added to the last.
1202 */
1203 public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
1204 String name, Class<?> type, Class<?> lookupClass) {
1205 int matchFlags = IS_FIELD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1206 return getMembers(defc, name, type, matchFlags, lookupClass);
1207 }
1208 /** Return a list of all nested types defined by the given class.
1209 * Super types are searched (for inherited members) if {@code searchSupers} is true.
1210 * Access checking is performed on behalf of the given {@code lookupClass}.
1211 * Inaccessible members are not added to the last.
1212 */
1213 public List<MemberName> getNestedTypes(Class<?> defc, boolean searchSupers,
1214 Class<?> lookupClass) {
1215 int matchFlags = IS_TYPE | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1216 return getMembers(defc, null, null, matchFlags, lookupClass);
1217 }
1218 private static MemberName[] newMemberBuffer(int length) {
1219 MemberName[] buf = new MemberName[length];
1220 // fill the buffer with dummy structs for the JVM to fill in
1221 for (int i = 0; i < length; i++)
1222 buf[i] = new MemberName();
1223 return buf;
1224 }
1225 }
1226 }
--- EOF ---