1 /*
   2  * Copyright (c) 2008, 2017, 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*/ final class ResolvedMethodName {
  74     //@Injected JVM_Method* vmtarget;
  75     //@Injected Class<?>    vmholder;
  76 };
  77 
  78 /*non-public*/ final class MemberName implements Member, Cloneable {
  79     private Class<?> clazz;       // class in which the member is defined
  80     private String   name;        // may be null if not yet materialized
  81     private Object   type;        // may be null if not yet materialized
  82     private int      flags;       // modifier bits; see reflect.Modifier
  83     private ResolvedMethodName method;    // cached resolved method information
  84     //@Injected intptr_t       vmindex;   // vtable index or offset of resolved member
  85     Object   resolution;  // if null, this guy is resolved
  86 
  87     /** Return the declaring class of this member.
  88      *  In the case of a bare name and type, the declaring class will be null.
  89      */
  90     public Class<?> getDeclaringClass() {
  91         return clazz;
  92     }
  93 
  94     /** Utility method producing the class loader of the declaring class. */
  95     public ClassLoader getClassLoader() {
  96         return clazz.getClassLoader();
  97     }
  98 
  99     /** Return the simple name of this member.
 100      *  For a type, it is the same as {@link Class#getSimpleName}.
 101      *  For a method or field, it is the simple name of the member.
 102      *  For a constructor, it is always {@code "<init>"}.
 103      */
 104     public String getName() {
 105         if (name == null) {
 106             expandFromVM();
 107             if (name == null) {
 108                 return null;
 109             }
 110         }
 111         return name;
 112     }
 113 
 114     public MethodType getMethodOrFieldType() {
 115         if (isInvocable())
 116             return getMethodType();
 117         if (isGetter())
 118             return MethodType.methodType(getFieldType());
 119         if (isSetter())
 120             return MethodType.methodType(void.class, getFieldType());
 121         throw new InternalError("not a method or field: "+this);
 122     }
 123 
 124     /** Return the declared type of this member, which
 125      *  must be a method or constructor.
 126      */
 127     public MethodType getMethodType() {
 128         if (type == null) {
 129             expandFromVM();
 130             if (type == null) {
 131                 return null;
 132             }
 133         }
 134         if (!isInvocable()) {
 135             throw newIllegalArgumentException("not invocable, no method type");
 136         }
 137 
 138         {
 139             // Get a snapshot of type which doesn't get changed by racing threads.
 140             final Object type = this.type;
 141             if (type instanceof MethodType) {
 142                 return (MethodType) type;
 143             }
 144         }
 145 
 146         // type is not a MethodType yet.  Convert it thread-safely.
 147         synchronized (this) {
 148             if (type instanceof String) {
 149                 String sig = (String) type;
 150                 MethodType res = MethodType.fromDescriptor(sig, getClassLoader());
 151                 type = res;
 152             } else if (type instanceof Object[]) {
 153                 Object[] typeInfo = (Object[]) type;
 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         if (isConstructor() && getReferenceKind() == REF_newInvokeSpecial)
 195             return itype.changeReturnType(clazz);
 196         if (!isStatic())
 197             return itype.insertParameterTypes(0, clazz);
 198         return itype;
 199     }
 200 
 201     /** Utility method producing the parameter types of the method type. */
 202     public Class<?>[] getParameterTypes() {
 203         return getMethodType().parameterArray();
 204     }
 205 
 206     /** Utility method producing the return type of the method type. */
 207     public Class<?> getReturnType() {
 208         return getMethodType().returnType();
 209     }
 210 
 211     /** Return the declared type of this member, which
 212      *  must be a field or type.
 213      *  If it is a type member, that type itself is returned.
 214      */
 215     public Class<?> getFieldType() {
 216         if (type == null) {
 217             expandFromVM();
 218             if (type == null) {
 219                 return null;
 220             }
 221         }
 222         if (isInvocable()) {
 223             throw newIllegalArgumentException("not a field or nested class, no simple type");
 224         }
 225 
 226         {
 227             // Get a snapshot of type which doesn't get changed by racing threads.
 228             final Object type = this.type;
 229             if (type instanceof Class<?>) {
 230                 return (Class<?>) type;
 231             }
 232         }
 233 
 234         // type is not a Class yet.  Convert it thread-safely.
 235         synchronized (this) {
 236             if (type instanceof String) {
 237                 String sig = (String) type;
 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 (isConstructor()) {
 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     /*non-public*/ boolean referenceKindIsConsistentWith(int originalRefKind) {
 314         int refKind = getReferenceKind();
 315         if (refKind == originalRefKind)  return true;
 316         switch (originalRefKind) {
 317         case REF_invokeInterface:
 318             // Looking up an interface method, can get (e.g.) Object.hashCode
 319             assert(refKind == REF_invokeVirtual ||
 320                    refKind == REF_invokeSpecial) : this;
 321             return true;
 322         case REF_invokeVirtual:
 323         case REF_newInvokeSpecial:
 324             // Looked up a virtual, can get (e.g.) final String.hashCode.
 325             assert(refKind == REF_invokeSpecial) : this;
 326             return true;
 327         }
 328         assert(false) : this+" != "+MethodHandleNatives.refKindName((byte)originalRefKind);
 329         return true;
 330     }
 331     private boolean staticIsConsistent() {
 332         byte refKind = getReferenceKind();
 333         return MethodHandleNatives.refKindIsStatic(refKind) == isStatic() || getModifiers() == 0;
 334     }
 335     private boolean vminfoIsConsistent() {
 336         byte refKind = getReferenceKind();
 337         assert(isResolved());  // else don't call
 338         Object vminfo = MethodHandleNatives.getMemberVMInfo(this);
 339         assert(vminfo instanceof Object[]);
 340         long vmindex = (Long) ((Object[])vminfo)[0];
 341         Object vmtarget = ((Object[])vminfo)[1];
 342         if (MethodHandleNatives.refKindIsField(refKind)) {
 343             assert(vmindex >= 0) : vmindex + ":" + this;
 344             assert(vmtarget instanceof Class);
 345         } else {
 346             if (MethodHandleNatives.refKindDoesDispatch(refKind))
 347                 assert(vmindex >= 0) : vmindex + ":" + this;
 348             else
 349                 assert(vmindex < 0) : vmindex;
 350             assert(vmtarget instanceof MemberName) : vmtarget + " in " + this;
 351         }
 352         return true;
 353     }
 354 
 355     private MemberName changeReferenceKind(byte refKind, byte oldKind) {
 356         assert(getReferenceKind() == oldKind);
 357         assert(MethodHandleNatives.refKindIsValid(refKind));
 358         flags += (((int)refKind - oldKind) << MN_REFERENCE_KIND_SHIFT);
 359         return this;
 360     }
 361 
 362     private boolean testFlags(int mask, int value) {
 363         return (flags & mask) == value;
 364     }
 365     private boolean testAllFlags(int mask) {
 366         return testFlags(mask, mask);
 367     }
 368     private boolean testAnyFlags(int mask) {
 369         return !testFlags(mask, 0);
 370     }
 371 
 372     /** Utility method to query if this member is a method handle invocation (invoke or invokeExact).
 373      */
 374     public boolean isMethodHandleInvoke() {
 375         final int bits = MH_INVOKE_MODS &~ Modifier.PUBLIC;
 376         final int negs = Modifier.STATIC;
 377         if (testFlags(bits | negs, bits) &&
 378             clazz == MethodHandle.class) {
 379             return isMethodHandleInvokeName(name);
 380         }
 381         return false;
 382     }
 383     public static boolean isMethodHandleInvokeName(String name) {
 384         switch (name) {
 385         case "invoke":
 386         case "invokeExact":
 387             return true;
 388         default:
 389             return false;
 390         }
 391     }
 392     public boolean isVarHandleMethodInvoke() {
 393         final int bits = MH_INVOKE_MODS &~ Modifier.PUBLIC;
 394         final int negs = Modifier.STATIC;
 395         if (testFlags(bits | negs, bits) &&
 396             clazz == VarHandle.class) {
 397             return isVarHandleMethodInvokeName(name);
 398         }
 399         return false;
 400     }
 401     public static boolean isVarHandleMethodInvokeName(String name) {
 402         try {
 403             VarHandle.AccessMode.valueFromMethodName(name);
 404             return true;
 405         } catch (IllegalArgumentException e) {
 406             return false;
 407         }
 408     }
 409     private static final int MH_INVOKE_MODS = Modifier.NATIVE | Modifier.FINAL | Modifier.PUBLIC;
 410 
 411     /** Utility method to query the modifier flags of this member. */
 412     public boolean isStatic() {
 413         return Modifier.isStatic(flags);
 414     }
 415     /** Utility method to query the modifier flags of this member. */
 416     public boolean isPublic() {
 417         return Modifier.isPublic(flags);
 418     }
 419     /** Utility method to query the modifier flags of this member. */
 420     public boolean isPrivate() {
 421         return Modifier.isPrivate(flags);
 422     }
 423     /** Utility method to query the modifier flags of this member. */
 424     public boolean isProtected() {
 425         return Modifier.isProtected(flags);
 426     }
 427     /** Utility method to query the modifier flags of this member. */
 428     public boolean isFinal() {
 429         return Modifier.isFinal(flags);
 430     }
 431     /** Utility method to query whether this member or its defining class is final. */
 432     public boolean canBeStaticallyBound() {
 433         return Modifier.isFinal(flags | clazz.getModifiers());
 434     }
 435     /** Utility method to query the modifier flags of this member. */
 436     public boolean isVolatile() {
 437         return Modifier.isVolatile(flags);
 438     }
 439     /** Utility method to query the modifier flags of this member. */
 440     public boolean isAbstract() {
 441         return Modifier.isAbstract(flags);
 442     }
 443     /** Utility method to query the modifier flags of this member. */
 444     public boolean isNative() {
 445         return Modifier.isNative(flags);
 446     }
 447     // let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo
 448 
 449     // unofficial modifier flags, used by HotSpot:
 450     static final int BRIDGE     = 0x00000040;
 451     static final int VARARGS    = 0x00000080;
 452     static final int SYNTHETIC  = 0x00001000;
 453     static final int ANNOTATION = 0x00002000;
 454     static final int ENUM       = 0x00004000;
 455 
 456     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
 457     public boolean isBridge() {
 458         return testAllFlags(IS_METHOD | BRIDGE);
 459     }
 460     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
 461     public boolean isVarargs() {
 462         return testAllFlags(VARARGS) && isInvocable();
 463     }
 464     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
 465     public boolean isSynthetic() {
 466         return testAllFlags(SYNTHETIC);
 467     }
 468 
 469     public boolean isValue() { return clazz.isValue(); }
 470 
 471 
 472     static final String CONSTRUCTOR_NAME = "<init>";  // the ever-popular
 473 
 474     // modifiers exported by the JVM:
 475     static final int RECOGNIZED_MODIFIERS = 0xFFFF;
 476 
 477     // private flags, not part of RECOGNIZED_MODIFIERS:
 478     static final int
 479             IS_METHOD        = MN_IS_METHOD,        // method (not constructor)
 480             IS_CONSTRUCTOR   = MN_IS_CONSTRUCTOR,   // constructor
 481             IS_FIELD         = MN_IS_FIELD,         // field
 482             IS_TYPE          = MN_IS_TYPE,          // nested type
 483             CALLER_SENSITIVE = MN_CALLER_SENSITIVE; // @CallerSensitive annotation detected
 484 
 485     static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
 486     static final int ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE;
 487     static final int IS_INVOCABLE = IS_METHOD | IS_CONSTRUCTOR;
 488     static final int IS_FIELD_OR_METHOD = IS_METHOD | IS_FIELD;
 489     static final int SEARCH_ALL_SUPERS = MN_SEARCH_SUPERCLASSES | MN_SEARCH_INTERFACES;
 490 
 491     /** Utility method to query whether this member is a method or constructor. */
 492     public boolean isInvocable() {
 493         return testAnyFlags(IS_INVOCABLE);
 494     }
 495     /** Utility method to query whether this member is a method, constructor, or field. */
 496     public boolean isFieldOrMethod() {
 497         return testAnyFlags(IS_FIELD_OR_METHOD);
 498     }
 499     /** Query whether this member is a method. */
 500     public boolean isMethod() {
 501         return testAllFlags(IS_METHOD);
 502     }
 503     /** Query whether this member is a constructor. */
 504     public boolean isConstructor() {
 505         return testAllFlags(IS_CONSTRUCTOR);
 506     }
 507     /** Query whether this member is a field. */
 508     public boolean isField() {
 509         return testAllFlags(IS_FIELD);
 510     }
 511     /** Query whether this member is a type. */
 512     public boolean isType() {
 513         return testAllFlags(IS_TYPE);
 514     }
 515     /** Utility method to query whether this member is neither public, private, nor protected. */
 516     public boolean isPackage() {
 517         return !testAnyFlags(ALL_ACCESS);
 518     }
 519     /** Query whether this member has a CallerSensitive annotation. */
 520     public boolean isCallerSensitive() {
 521         return testAllFlags(CALLER_SENSITIVE);
 522     }
 523 
 524     /** Utility method to query whether this member is accessible from a given lookup class. */
 525     public boolean isAccessibleFrom(Class<?> lookupClass) {
 526         int mode = (ALL_ACCESS|MethodHandles.Lookup.PACKAGE|MethodHandles.Lookup.MODULE);
 527         return VerifyAccess.isMemberAccessible(this.getDeclaringClass(), this.getDeclaringClass(), flags,
 528                                                lookupClass, mode);
 529     }
 530 
 531     /**
 532      * Check if MemberName is a call to a method named {@code name} in class {@code declaredClass}.
 533      */
 534     public boolean refersTo(Class<?> declc, String n) {
 535         return clazz == declc && getName().equals(n);
 536     }
 537 
 538     /** Initialize a query.   It is not resolved. */
 539     private void init(Class<?> defClass, String name, Object type, int flags) {
 540         // defining class is allowed to be null (for a naked name/type pair)
 541         //name.toString();  // null check
 542         //type.equals(type);  // null check
 543         // fill in fields:
 544         this.clazz = defClass;
 545         this.name = name;
 546         this.type = type;
 547         this.flags = flags;
 548         assert(testAnyFlags(ALL_KINDS));
 549         assert(this.resolution == null);  // nobody should have touched this yet
 550         //assert(referenceKindIsConsistent());  // do this after resolution
 551     }
 552 
 553     /**
 554      * Calls down to the VM to fill in the fields.  This method is
 555      * synchronized to avoid racing calls.
 556      */
 557     private void expandFromVM() {
 558         if (type != null) {
 559             return;
 560         }
 561         if (!isResolved()) {
 562             return;
 563         }
 564         MethodHandleNatives.expand(this);
 565     }
 566 
 567     // Capturing information from the Core Reflection API:
 568     private static int flagsMods(int flags, int mods, byte refKind) {
 569         assert((flags & RECOGNIZED_MODIFIERS) == 0);
 570         assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
 571         assert((refKind & ~MN_REFERENCE_KIND_MASK) == 0);
 572         return flags | mods | (refKind << MN_REFERENCE_KIND_SHIFT);
 573     }
 574     /** Create a name for the given reflected method.  The resulting name will be in a resolved state. */
 575     public MemberName(Method m) {
 576         this(m, false);
 577     }
 578     @SuppressWarnings("LeakingThisInConstructor")
 579     public MemberName(Method m, boolean wantSpecial) {
 580         Objects.requireNonNull(m);
 581         // fill in vmtarget, vmindex while we have m in hand:
 582         MethodHandleNatives.init(this, m);
 583         if (clazz == null) {  // MHN.init failed
 584             if (m.getDeclaringClass() == MethodHandle.class &&
 585                 isMethodHandleInvokeName(m.getName())) {
 586                 // The JVM did not reify this signature-polymorphic instance.
 587                 // Need a special case here.
 588                 // See comments on MethodHandleNatives.linkMethod.
 589                 MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
 590                 int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
 591                 init(MethodHandle.class, m.getName(), type, flags);
 592                 if (isMethodHandleInvoke())
 593                     return;
 594             }
 595             if (m.getDeclaringClass() == VarHandle.class &&
 596                 isVarHandleMethodInvokeName(m.getName())) {
 597                 // The JVM did not reify this signature-polymorphic instance.
 598                 // Need a special case here.
 599                 // See comments on MethodHandleNatives.linkMethod.
 600                 MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
 601                 int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
 602                 init(VarHandle.class, m.getName(), type, flags);
 603                 if (isVarHandleMethodInvoke())
 604                     return;
 605             }
 606             throw new LinkageError(m.toString());
 607         }
 608         assert(isResolved() && this.clazz != null);
 609         this.name = m.getName();
 610         if (this.type == null)
 611             this.type = new Object[] { m.getReturnType(), m.getParameterTypes() };
 612         if (wantSpecial) {
 613             if (isAbstract())
 614                 throw new AbstractMethodError(this.toString());
 615             if (getReferenceKind() == REF_invokeVirtual)
 616                 changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
 617             else if (getReferenceKind() == REF_invokeInterface)
 618                 // invokeSpecial on a default method
 619                 changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
 620         }
 621     }
 622     public MemberName asSpecial() {
 623         switch (getReferenceKind()) {
 624         case REF_invokeSpecial:     return this;
 625         case REF_invokeVirtual:     return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
 626         case REF_invokeInterface:   return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
 627         case REF_newInvokeSpecial:  return clone().changeReferenceKind(REF_invokeSpecial, REF_newInvokeSpecial);
 628         }
 629         throw new IllegalArgumentException(this.toString());
 630     }
 631     /** If this MN is not REF_newInvokeSpecial, return a clone with that ref. kind.
 632      *  In that case it must already be REF_invokeSpecial.
 633      */
 634     public MemberName asConstructor() {
 635         switch (getReferenceKind()) {
 636         case REF_invokeSpecial:     return clone().changeReferenceKind(REF_newInvokeSpecial, REF_invokeSpecial);
 637         case REF_newInvokeSpecial:  return this;
 638         }
 639         throw new IllegalArgumentException(this.toString());
 640     }
 641     /** If this MN is a REF_invokeSpecial, return a clone with the "normal" kind
 642      *  REF_invokeVirtual; also switch either to REF_invokeInterface if clazz.isInterface.
 643      *  The end result is to get a fully virtualized version of the MN.
 644      *  (Note that resolving in the JVM will sometimes devirtualize, changing
 645      *  REF_invokeVirtual of a final to REF_invokeSpecial, and REF_invokeInterface
 646      *  in some corner cases to either of the previous two; this transform
 647      *  undoes that change under the assumption that it occurred.)
 648      */
 649     public MemberName asNormalOriginal() {
 650         byte normalVirtual = clazz.isInterface() ? REF_invokeInterface : REF_invokeVirtual;
 651         byte refKind = getReferenceKind();
 652         byte newRefKind = refKind;
 653         MemberName result = this;
 654         switch (refKind) {
 655         case REF_invokeInterface:
 656         case REF_invokeVirtual:
 657         case REF_invokeSpecial:
 658             newRefKind = normalVirtual;
 659             break;
 660         }
 661         if (newRefKind == refKind)
 662             return this;
 663         result = clone().changeReferenceKind(newRefKind, refKind);
 664         assert(this.referenceKindIsConsistentWith(result.getReferenceKind()));
 665         return result;
 666     }
 667     /** Create a name for the given reflected constructor.  The resulting name will be in a resolved state. */
 668     @SuppressWarnings("LeakingThisInConstructor")
 669     public MemberName(Constructor<?> ctor) {
 670         Objects.requireNonNull(ctor);
 671         // fill in vmtarget, vmindex while we have ctor in hand:
 672         MethodHandleNatives.init(this, ctor);
 673         assert(isResolved() && this.clazz != null);
 674         this.name = CONSTRUCTOR_NAME;
 675         if (this.type == null)
 676             this.type = new Object[] { void.class, ctor.getParameterTypes() };
 677     }
 678     /** Create a name for the given reflected field.  The resulting name will be in a resolved state.
 679      */
 680     public MemberName(Field fld) {
 681         this(fld, false);
 682     }
 683     @SuppressWarnings("LeakingThisInConstructor")
 684     public MemberName(Field fld, boolean makeSetter) {
 685         Objects.requireNonNull(fld);
 686         // fill in vmtarget, vmindex while we have fld in hand:
 687         MethodHandleNatives.init(this, fld);
 688         assert(isResolved() && this.clazz != null);
 689         this.name = fld.getName();
 690         this.type = fld.getType();
 691         assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
 692         byte refKind = this.getReferenceKind();
 693         assert(refKind == (isStatic() ? REF_getStatic : REF_getField));
 694         if (makeSetter) {
 695             changeReferenceKind((byte)(refKind + (REF_putStatic - REF_getStatic)), refKind);
 696         }
 697     }
 698     public boolean isGetter() {
 699         return MethodHandleNatives.refKindIsGetter(getReferenceKind());
 700     }
 701     public boolean isSetter() {
 702         return MethodHandleNatives.refKindIsSetter(getReferenceKind());
 703     }
 704     public MemberName asSetter() {
 705         byte refKind = getReferenceKind();
 706         assert(MethodHandleNatives.refKindIsGetter(refKind));
 707         assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
 708         byte setterRefKind = (byte)(refKind + (REF_putField - REF_getField));
 709         return clone().changeReferenceKind(setterRefKind, refKind);
 710     }
 711     /** Create a name for the given class.  The resulting name will be in a resolved state. */
 712     public MemberName(Class<?> type) {
 713         init(type.getDeclaringClass(), type.getSimpleName(), type,
 714                 flagsMods(IS_TYPE, type.getModifiers(), REF_NONE));
 715         initResolved(true);
 716     }
 717 
 718     /**
 719      * Create a name for a signature-polymorphic invoker.
 720      * This is a placeholder for a signature-polymorphic instance
 721      * (of MH.invokeExact, etc.) that the JVM does not reify.
 722      * See comments on {@link MethodHandleNatives#linkMethod}.
 723      */
 724     static MemberName makeMethodHandleInvoke(String name, MethodType type) {
 725         return makeMethodHandleInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
 726     }
 727     static MemberName makeMethodHandleInvoke(String name, MethodType type, int mods) {
 728         MemberName mem = new MemberName(MethodHandle.class, name, type, REF_invokeVirtual);
 729         mem.flags |= mods;  // it's not resolved, but add these modifiers anyway
 730         assert(mem.isMethodHandleInvoke()) : mem;
 731         return mem;
 732     }
 733 
 734     static MemberName makeVarHandleMethodInvoke(String name, MethodType type) {
 735         return makeVarHandleMethodInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
 736     }
 737     static MemberName makeVarHandleMethodInvoke(String name, MethodType type, int mods) {
 738         MemberName mem = new MemberName(VarHandle.class, name, type, REF_invokeVirtual);
 739         mem.flags |= mods;  // it's not resolved, but add these modifiers anyway
 740         assert(mem.isVarHandleMethodInvoke()) : mem;
 741         return mem;
 742     }
 743 
 744     // bare-bones constructor; the JVM will fill it in
 745     MemberName() { }
 746 
 747     // locally useful cloner
 748     @Override protected MemberName clone() {
 749         try {
 750             return (MemberName) super.clone();
 751         } catch (CloneNotSupportedException ex) {
 752             throw newInternalError(ex);
 753         }
 754      }
 755 
 756     /** Get the definition of this member name.
 757      *  This may be in a super-class of the declaring class of this member.
 758      */
 759     public MemberName getDefinition() {
 760         if (!isResolved())  throw new IllegalStateException("must be resolved: "+this);
 761         if (isType())  return this;
 762         MemberName res = this.clone();
 763         res.clazz = null;
 764         res.type = null;
 765         res.name = null;
 766         res.resolution = res;
 767         res.expandFromVM();
 768         assert(res.getName().equals(this.getName()));
 769         return res;
 770     }
 771 
 772     @Override
 773     @SuppressWarnings("deprecation")
 774     public int hashCode() {
 775         // Avoid autoboxing getReferenceKind(), since this is used early and will force
 776         // early initialization of Byte$ByteCache
 777         return Objects.hash(clazz, new Byte(getReferenceKind()), name, getType());
 778     }
 779 
 780     @Override
 781     public boolean equals(Object that) {
 782         return (that instanceof MemberName && this.equals((MemberName)that));
 783     }
 784 
 785     /** Decide if two member names have exactly the same symbolic content.
 786      *  Does not take into account any actual class members, so even if
 787      *  two member names resolve to the same actual member, they may
 788      *  be distinct references.
 789      */
 790     public boolean equals(MemberName that) {
 791         if (this == that)  return true;
 792         if (that == null)  return false;
 793         return this.clazz == that.clazz
 794                 && this.getReferenceKind() == that.getReferenceKind()
 795                 && Objects.equals(this.name, that.name)
 796                 && Objects.equals(this.getType(), that.getType());
 797     }
 798 
 799     // Construction from symbolic parts, for queries:
 800     /** Create a field or type name from the given components:
 801      *  Declaring class, name, type, reference kind.
 802      *  The declaring class may be supplied as null if this is to be a bare name and type.
 803      *  The resulting name will in an unresolved state.
 804      */
 805     public MemberName(Class<?> defClass, String name, Class<?> type, byte refKind) {
 806         init(defClass, name, type, flagsMods(IS_FIELD, 0, refKind));
 807         initResolved(false);
 808     }
 809     /** Create a method or constructor name from the given components:
 810      *  Declaring class, name, type, reference kind.
 811      *  It will be a constructor if and only if the name is {@code "<init>"}.
 812      *  The declaring class may be supplied as null if this is to be a bare name and type.
 813      *  The last argument is optional, a boolean which requests REF_invokeSpecial.
 814      *  The resulting name will in an unresolved state.
 815      */
 816     public MemberName(Class<?> defClass, String name, MethodType type, byte refKind) {
 817         int initFlags = (name != null && name.equals(CONSTRUCTOR_NAME) ? IS_CONSTRUCTOR : IS_METHOD);
 818         init(defClass, name, type, flagsMods(initFlags, 0, refKind));
 819         initResolved(false);
 820     }
 821     /** Create a method, constructor, or field name from the given components:
 822      *  Reference kind, declaring class, name, type.
 823      */
 824     public MemberName(byte refKind, Class<?> defClass, String name, Object type) {
 825         int kindFlags;
 826         if (MethodHandleNatives.refKindIsField(refKind)) {
 827             kindFlags = IS_FIELD;
 828             if (!(type instanceof Class))
 829                 throw newIllegalArgumentException("not a field type");
 830         } else if (MethodHandleNatives.refKindIsMethod(refKind)) {
 831             kindFlags = IS_METHOD;
 832             if (!(type instanceof MethodType))
 833                 throw newIllegalArgumentException("not a method type");
 834         } else if (refKind == REF_newInvokeSpecial) {
 835             kindFlags = IS_CONSTRUCTOR;
 836             if (!(type instanceof MethodType) ||
 837                 !CONSTRUCTOR_NAME.equals(name))
 838                 throw newIllegalArgumentException("not a constructor type or name");
 839         } else {
 840             throw newIllegalArgumentException("bad reference kind "+refKind);
 841         }
 842         init(defClass, name, type, flagsMods(kindFlags, 0, refKind));
 843         initResolved(false);
 844     }
 845     /** Query whether this member name is resolved to a non-static, non-final method.
 846      */
 847     public boolean hasReceiverTypeDispatch() {
 848         return MethodHandleNatives.refKindDoesDispatch(getReferenceKind());
 849     }
 850 
 851     /** Query whether this member name is resolved.
 852      *  A resolved member name is one for which the JVM has found
 853      *  a method, constructor, field, or type binding corresponding exactly to the name.
 854      *  (Document?)
 855      */
 856     public boolean isResolved() {
 857         return resolution == null;
 858     }
 859 
 860     void initResolved(boolean isResolved) {
 861         assert(this.resolution == null);  // not initialized yet!
 862         if (!isResolved)
 863             this.resolution = this;
 864         assert(isResolved() == isResolved);
 865     }
 866 
 867     void checkForTypeAlias(Class<?> refc) {
 868         if (isInvocable()) {
 869             MethodType type;
 870             if (this.type instanceof MethodType)
 871                 type = (MethodType) this.type;
 872             else
 873                 this.type = type = getMethodType();
 874             if (type.erase() == type)  return;
 875             if (VerifyAccess.isTypeVisible(type, refc))  return;
 876             throw new LinkageError("bad method type alias: "+type+" not visible from "+refc);
 877         } else {
 878             Class<?> type;
 879             if (this.type instanceof Class<?>)
 880                 type = (Class<?>) this.type;
 881             else
 882                 this.type = type = getFieldType();
 883             if (VerifyAccess.isTypeVisible(type, refc))  return;
 884             throw new LinkageError("bad field type alias: "+type+" not visible from "+refc);
 885         }
 886     }
 887 
 888 
 889     /** Produce a string form of this member name.
 890      *  For types, it is simply the type's own string (as reported by {@code toString}).
 891      *  For fields, it is {@code "DeclaringClass.name/type"}.
 892      *  For methods and constructors, it is {@code "DeclaringClass.name(ptype...)rtype"}.
 893      *  If the declaring class is null, the prefix {@code "DeclaringClass."} is omitted.
 894      *  If the member is unresolved, a prefix {@code "*."} is prepended.
 895      */
 896     @SuppressWarnings("LocalVariableHidesMemberVariable")
 897     @Override
 898     public String toString() {
 899         if (isType())
 900             return type.toString();  // class java.lang.String
 901         // else it is a field, method, or constructor
 902         StringBuilder buf = new StringBuilder();
 903         if (getDeclaringClass() != null) {
 904             buf.append(getName(clazz));
 905             buf.append('.');
 906         }
 907         String name = this.name; // avoid expanding from VM
 908         buf.append(name == null ? "*" : name);
 909         Object type = this.type; // avoid expanding from VM
 910         if (!isInvocable()) {
 911             buf.append('/');
 912             buf.append(type == null ? "*" : getName(type));
 913         } else {
 914             buf.append(type == null ? "(*)*" : getName(type));
 915         }
 916         byte refKind = getReferenceKind();
 917         if (refKind != REF_NONE) {
 918             buf.append('/');
 919             buf.append(MethodHandleNatives.refKindName(refKind));
 920         }
 921         //buf.append("#").append(System.identityHashCode(this));
 922         return buf.toString();
 923     }
 924     private static String getName(Object obj) {
 925         if (obj instanceof Class<?>)
 926             return ((Class<?>)obj).getName();
 927         return String.valueOf(obj);
 928     }
 929 
 930     public IllegalAccessException makeAccessException(String message, Object from) {
 931         message = message + ": "+ toString();
 932         if (from != null)  {
 933             if (from == MethodHandles.publicLookup()) {
 934                 message += ", from public Lookup";
 935             } else {
 936                 Module m;
 937                 if (from instanceof MethodHandles.Lookup) {
 938                     MethodHandles.Lookup lookup = (MethodHandles.Lookup)from;
 939                     m = lookup.lookupClass().getModule();
 940                 } else {
 941                     m = from.getClass().getModule();
 942                 }
 943                 message += ", from " + from + " (" + m + ")";
 944             }
 945         }
 946         return new IllegalAccessException(message);
 947     }
 948     private String message() {
 949         if (isResolved())
 950             return "no access";
 951         else if (isConstructor())
 952             return "no such constructor";
 953         else if (isMethod())
 954             return "no such method";
 955         else
 956             return "no such field";
 957     }
 958     public ReflectiveOperationException makeAccessException() {
 959         String message = message() + ": "+ toString();
 960         ReflectiveOperationException ex;
 961         if (isResolved() || !(resolution instanceof NoSuchMethodError ||
 962                               resolution instanceof NoSuchFieldError))
 963             ex = new IllegalAccessException(message);
 964         else if (isConstructor())
 965             ex = new NoSuchMethodException(message);
 966         else if (isMethod())
 967             ex = new NoSuchMethodException(message);
 968         else
 969             ex = new NoSuchFieldException(message);
 970         if (resolution instanceof Throwable)
 971             ex.initCause((Throwable) resolution);
 972         return ex;
 973     }
 974 
 975     /** Actually making a query requires an access check. */
 976     /*non-public*/ static Factory getFactory() {
 977         return Factory.INSTANCE;
 978     }
 979     /** A factory type for resolving member names with the help of the VM.
 980      *  TBD: Define access-safe public constructors for this factory.
 981      */
 982     /*non-public*/ static class Factory {
 983         private Factory() { } // singleton pattern
 984         static Factory INSTANCE = new Factory();
 985 
 986         private static int ALLOWED_FLAGS = ALL_KINDS;
 987 
 988         /// Queries
 989         List<MemberName> getMembers(Class<?> defc,
 990                 String matchName, Object matchType,
 991                 int matchFlags, Class<?> lookupClass) {
 992             matchFlags &= ALLOWED_FLAGS;
 993             String matchSig = null;
 994             if (matchType != null) {
 995                 matchSig = BytecodeDescriptor.unparse(matchType);
 996                 if (matchSig.startsWith("("))
 997                     matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
 998                 else
 999                     matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
1000             }
1001             final int BUF_MAX = 0x2000;
1002             int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
1003             MemberName[] buf = newMemberBuffer(len1);
1004             int totalCount = 0;
1005             ArrayList<MemberName[]> bufs = null;
1006             int bufCount = 0;
1007             for (;;) {
1008                 bufCount = MethodHandleNatives.getMembers(defc,
1009                         matchName, matchSig, matchFlags,
1010                         lookupClass,
1011                         totalCount, buf);
1012                 if (bufCount <= buf.length) {
1013                     if (bufCount < 0)  bufCount = 0;
1014                     totalCount += bufCount;
1015                     break;
1016                 }
1017                 // JVM returned to us with an intentional overflow!
1018                 totalCount += buf.length;
1019                 int excess = bufCount - buf.length;
1020                 if (bufs == null)  bufs = new ArrayList<>(1);
1021                 bufs.add(buf);
1022                 int len2 = buf.length;
1023                 len2 = Math.max(len2, excess);
1024                 len2 = Math.max(len2, totalCount / 4);
1025                 buf = newMemberBuffer(Math.min(BUF_MAX, len2));
1026             }
1027             ArrayList<MemberName> result = new ArrayList<>(totalCount);
1028             if (bufs != null) {
1029                 for (MemberName[] buf0 : bufs) {
1030                     Collections.addAll(result, buf0);
1031                 }
1032             }
1033             for (int i = 0; i < bufCount; i++) {
1034                 result.add(buf[i]);
1035             }
1036             // Signature matching is not the same as type matching, since
1037             // one signature might correspond to several types.
1038             // So if matchType is a Class or MethodType, refilter the results.
1039             if (matchType != null && matchType != matchSig) {
1040                 for (Iterator<MemberName> it = result.iterator(); it.hasNext();) {
1041                     MemberName m = it.next();
1042                     if (!matchType.equals(m.getType()))
1043                         it.remove();
1044                 }
1045             }
1046             return result;
1047         }
1048         /** Produce a resolved version of the given member.
1049          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1050          *  Access checking is performed on behalf of the given {@code lookupClass}.
1051          *  If lookup fails or access is not permitted, null is returned.
1052          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1053          */
1054         private MemberName resolve(byte refKind, MemberName ref, Class<?> lookupClass) {
1055             MemberName m = ref.clone();  // JVM will side-effect the ref
1056             assert(refKind == m.getReferenceKind());
1057             try {
1058                 // There are 4 entities in play here:
1059                 //   * LC: lookupClass
1060                 //   * REFC: symbolic reference class (MN.clazz before resolution);
1061                 //   * DEFC: resolved method holder (MN.clazz after resolution);
1062                 //   * PTYPES: parameter types (MN.type)
1063                 //
1064                 // What we care about when resolving a MemberName is consistency between DEFC and PTYPES.
1065                 // We do type alias (TA) checks on DEFC to ensure that. DEFC is not known until the JVM
1066                 // finishes the resolution, so do TA checks right after MHN.resolve() is over.
1067                 //
1068                 // All parameters passed by a caller are checked against MH type (PTYPES) on every invocation,
1069                 // so it is safe to call a MH from any context.
1070                 //
1071                 // REFC view on PTYPES doesn't matter, since it is used only as a starting point for resolution and doesn't
1072                 // participate in method selection.
1073                 m = MethodHandleNatives.resolve(m, lookupClass);
1074                 m.checkForTypeAlias(m.getDeclaringClass());
1075                 m.resolution = null;
1076             } catch (ClassNotFoundException | LinkageError ex) {
1077                 // JVM reports that the "bytecode behavior" would get an error
1078                 assert(!m.isResolved());
1079                 m.resolution = ex;
1080                 return m;
1081             }
1082             assert(m.referenceKindIsConsistent());
1083             m.initResolved(true);
1084             assert(m.vminfoIsConsistent());
1085             return m;
1086         }
1087         /** Produce a resolved version of the given member.
1088          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1089          *  Access checking is performed on behalf of the given {@code lookupClass}.
1090          *  If lookup fails or access is not permitted, a {@linkplain ReflectiveOperationException} is thrown.
1091          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1092          */
1093         public
1094         <NoSuchMemberException extends ReflectiveOperationException>
1095         MemberName resolveOrFail(byte refKind, MemberName m, Class<?> lookupClass,
1096                                  Class<NoSuchMemberException> nsmClass)
1097                 throws IllegalAccessException, NoSuchMemberException {
1098             MemberName result = resolve(refKind, m, lookupClass);
1099             if (result.isResolved())
1100                 return result;
1101             ReflectiveOperationException ex = result.makeAccessException();
1102             if (ex instanceof IllegalAccessException)  throw (IllegalAccessException) ex;
1103             throw nsmClass.cast(ex);
1104         }
1105         /** Produce a resolved version of the given member.
1106          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1107          *  Access checking is performed on behalf of the given {@code lookupClass}.
1108          *  If lookup fails or access is not permitted, return null.
1109          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
1110          */
1111         public
1112         MemberName resolveOrNull(byte refKind, MemberName m, Class<?> lookupClass) {
1113             MemberName result = resolve(refKind, m, lookupClass);
1114             if (result.isResolved())
1115                 return result;
1116             return null;
1117         }
1118         /** Return a list of all methods defined by the given class.
1119          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1120          *  Access checking is performed on behalf of the given {@code lookupClass}.
1121          *  Inaccessible members are not added to the last.
1122          */
1123         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
1124                 Class<?> lookupClass) {
1125             return getMethods(defc, searchSupers, null, null, lookupClass);
1126         }
1127         /** Return a list of matching methods defined by the given class.
1128          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1129          *  Returned methods will match the name (if not null) and the type (if not null).
1130          *  Access checking is performed on behalf of the given {@code lookupClass}.
1131          *  Inaccessible members are not added to the last.
1132          */
1133         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
1134                 String name, MethodType type, Class<?> lookupClass) {
1135             int matchFlags = IS_METHOD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1136             return getMembers(defc, name, type, matchFlags, lookupClass);
1137         }
1138         /** Return a list of all constructors defined by the given class.
1139          *  Access checking is performed on behalf of the given {@code lookupClass}.
1140          *  Inaccessible members are not added to the last.
1141          */
1142         public List<MemberName> getConstructors(Class<?> defc, Class<?> lookupClass) {
1143             return getMembers(defc, null, null, IS_CONSTRUCTOR, lookupClass);
1144         }
1145         /** Return a list of all fields defined by the given class.
1146          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1147          *  Access checking is performed on behalf of the given {@code lookupClass}.
1148          *  Inaccessible members are not added to the last.
1149          */
1150         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
1151                 Class<?> lookupClass) {
1152             return getFields(defc, searchSupers, null, null, lookupClass);
1153         }
1154         /** Return a list of all fields defined by the given class.
1155          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1156          *  Returned fields will match the name (if not null) and the type (if not null).
1157          *  Access checking is performed on behalf of the given {@code lookupClass}.
1158          *  Inaccessible members are not added to the last.
1159          */
1160         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
1161                 String name, Class<?> type, Class<?> lookupClass) {
1162             int matchFlags = IS_FIELD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1163             return getMembers(defc, name, type, matchFlags, lookupClass);
1164         }
1165         /** Return a list of all nested types defined by the given class.
1166          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
1167          *  Access checking is performed on behalf of the given {@code lookupClass}.
1168          *  Inaccessible members are not added to the last.
1169          */
1170         public List<MemberName> getNestedTypes(Class<?> defc, boolean searchSupers,
1171                 Class<?> lookupClass) {
1172             int matchFlags = IS_TYPE | (searchSupers ? SEARCH_ALL_SUPERS : 0);
1173             return getMembers(defc, null, null, matchFlags, lookupClass);
1174         }
1175         private static MemberName[] newMemberBuffer(int length) {
1176             MemberName[] buf = new MemberName[length];
1177             // fill the buffer with dummy structs for the JVM to fill in
1178             for (int i = 0; i < length; i++)
1179                 buf[i] = new MemberName();
1180             return buf;
1181         }
1182     }
1183 }
--- EOF ---