src/share/classes/sun/dyn/MemberName.java - toolchain/jdk/jdk9_jdk - Git at Google

 /*
  * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package sun.dyn;

 import sun.dyn.util.BytecodeDescriptor;
 import java.dyn.*;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.Member;
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 import static sun.dyn.MethodHandleNatives.Constants.*;

 /**
  * Compact information which fully characterizes a method or field reference.
  * When resolved, it includes a direct pointer to JVM metadata.
  * This representation is stateless and only decriptive.
  * It provides no private information and no capability to use the member.
  * <p>
  * By contrast, a java.lang.reflect.Method contains fuller information
  * about the internals of a method (except its bytecodes) and also
  * allows invocation.  A MemberName is much lighter than a reflect.Method,
  * since it contains about 7 fields to Method's 16 (plus its sub-arrays),
  * and those seven fields omit much of the information in Method.
  * @author jrose
  */
 public final class MemberName implements Member, Cloneable {
     private Class<?>   clazz;       // class in which the method is defined
     private String     name;        // may be null if not yet materialized
     private Object     type;        // may be null if not yet materialized
     private int        flags;       // modifier bits; see reflect.Modifier

     private Object     vmtarget;    // VM-specific target value
     private int        vmindex;     // method index within class or interface

     { vmindex = VM_INDEX_UNINITIALIZED; }

     public Class<?> getDeclaringClass() {
         if (clazz == null && isResolved()) {
             expandFromVM();
         }
         return clazz;
     }

     public ClassLoader getClassLoader() {
         return clazz.getClassLoader();
     }

     public String getName() {
         if (name == null) {
             expandFromVM();
             if (name == null)  return null;
         }
         return name;
     }

     public MethodType getMethodType() {
         if (type == null) {
             expandFromVM();
             if (type == null)  return null;
         }
         if (!isInvocable())
             throw newIllegalArgumentException("not invocable, no method type");
         if (type instanceof MethodType) {
             return (MethodType) type;
         }
         if (type instanceof String) {
             String sig = (String) type;
             MethodType res = MethodType.fromMethodDescriptorString(sig, getClassLoader());
             this.type = res;
             return res;
         }
         if (type instanceof Object[]) {
             Object[] typeInfo = (Object[]) type;
             Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
             Class<?> rtype = (Class<?>) typeInfo[0];
             MethodType res = MethodType.methodType(rtype, ptypes);
             this.type = res;
             return res;
         }
         throw new InternalError("bad method type "+type);
     }

     public MethodType getInvocationType() {
         MethodType itype = getMethodType();
         if (!isStatic())
             itype = itype.insertParameterTypes(0, clazz);
         return itype;
     }

     public Class<?>[] getParameterTypes() {
         return getMethodType().parameterArray();
     }

     public Class<?> getReturnType() {
         return getMethodType().returnType();
     }

     public Class<?> getFieldType() {
         if (type == null) {
             expandFromVM();
             if (type == null)  return null;
         }
         if (isInvocable())
             throw newIllegalArgumentException("not a field or nested class, no simple type");
         if (type instanceof Class<?>) {
             return (Class<?>) type;
         }
         if (type instanceof String) {
             String sig = (String) type;
             MethodType mtype = MethodType.fromMethodDescriptorString("()"+sig, getClassLoader());
             Class<?> res = mtype.returnType();
             this.type = res;
             return res;
         }
         throw new InternalError("bad field type "+type);
     }

     public Object getType() {
         return (isInvocable() ? getMethodType() : getFieldType());
     }

     public String getSignature() {
         if (type == null) {
             expandFromVM();
             if (type == null)  return null;
         }
         if (type instanceof String)
             return (String) type;
         if (isInvocable())
             return BytecodeDescriptor.unparse(getMethodType());
         else
             return BytecodeDescriptor.unparse(getFieldType());
     }

     public int getModifiers() {
         return (flags & RECOGNIZED_MODIFIERS);
     }

     private void setFlags(int flags) {
         this.flags = flags;
         assert(testAnyFlags(ALL_KINDS));
     }

     private boolean testFlags(int mask, int value) {
         return (flags & mask) == value;
     }
     private boolean testAllFlags(int mask) {
         return testFlags(mask, mask);
     }
     private boolean testAnyFlags(int mask) {
         return !testFlags(mask, 0);
     }

     public boolean isStatic() {
         return Modifier.isStatic(flags);
     }
     public boolean isPublic() {
         return Modifier.isPublic(flags);
     }
     public boolean isPrivate() {
         return Modifier.isPrivate(flags);
     }
     public boolean isProtected() {
         return Modifier.isProtected(flags);
     }
     public boolean isFinal() {
         return Modifier.isFinal(flags);
     }
     public boolean isAbstract() {
         return Modifier.isAbstract(flags);
     }
     // let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo

     // unofficial modifier flags, used by HotSpot:
     static final int BRIDGE    = 0x00000040;
     static final int VARARGS   = 0x00000080;
     static final int SYNTHETIC = 0x00001000;
     static final int ANNOTATION= 0x00002000;
     static final int ENUM      = 0x00004000;
     public boolean isBridge() {
         return testAllFlags(IS_METHOD | BRIDGE);
     }
     public boolean isVarargs() {
         return testAllFlags(VARARGS) && isInvocable();
     }
     public boolean isSynthetic() {
         return testAllFlags(SYNTHETIC);
     }

     static final String CONSTRUCTOR_NAME = "<init>";  // the ever-popular

     // modifiers exported by the JVM:
     static final int RECOGNIZED_MODIFIERS = 0xFFFF;

     // private flags, not part of RECOGNIZED_MODIFIERS:
     static final int
             IS_METHOD      = MN_IS_METHOD,      // method (not constructor)
             IS_CONSTRUCTOR = MN_IS_CONSTRUCTOR, // constructor
             IS_FIELD       = MN_IS_FIELD,       // field
             IS_TYPE        = MN_IS_TYPE;        // nested type
     static final int  // for MethodHandleNatives.getMembers
             SEARCH_SUPERCLASSES = MN_SEARCH_SUPERCLASSES,
             SEARCH_INTERFACES   = MN_SEARCH_INTERFACES;

     static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
     static final int ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE;
     static final int IS_INVOCABLE = IS_METHOD | IS_CONSTRUCTOR;
     static final int IS_FIELD_OR_METHOD = IS_METHOD | IS_FIELD;
     static final int SEARCH_ALL_SUPERS = SEARCH_SUPERCLASSES | SEARCH_INTERFACES;

     public boolean isInvocable() {
         return testAnyFlags(IS_INVOCABLE);
     }
     public boolean isFieldOrMethod() {
         return testAnyFlags(IS_FIELD_OR_METHOD);
     }
     public boolean isMethod() {
         return testAllFlags(IS_METHOD);
     }
     public boolean isConstructor() {
         return testAllFlags(IS_CONSTRUCTOR);
     }
     public boolean isField() {
         return testAllFlags(IS_FIELD);
     }
     public boolean isType() {
         return testAllFlags(IS_TYPE);
     }
     public boolean isPackage() {
         return !testAnyFlags(ALL_ACCESS);
     }

     /** Initialize a query.   It is not resolved. */
     private void init(Class<?> defClass, String name, Object type, int flags) {
         // defining class is allowed to be null (for a naked name/type pair)
         name.toString();  // null check
         type.equals(type);  // null check
         // fill in fields:
         this.clazz = defClass;
         this.name = name;
         this.type = type;
         setFlags(flags);
         assert(!isResolved());
     }

     private void expandFromVM() {
         if (!isResolved())  return;
         if (type instanceof Object[])
             type = null;  // don't saddle JVM w/ typeInfo
         MethodHandleNatives.expand(this);
     }

     // Capturing information from the Core Reflection API:
     private static int flagsMods(int flags, int mods) {
         assert((flags & RECOGNIZED_MODIFIERS) == 0);
         assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
         return flags | mods;
     }
     public MemberName(Method m) {
         Object[] typeInfo = { m.getReturnType(), m.getParameterTypes() };
         init(m.getDeclaringClass(), m.getName(), typeInfo, flagsMods(IS_METHOD, m.getModifiers()));
         // fill in vmtarget, vmindex while we have m in hand:
         MethodHandleNatives.init(this, m);
         assert(isResolved());
     }
     public MemberName(Constructor ctor) {
         Object[] typeInfo = { void.class, ctor.getParameterTypes() };
         init(ctor.getDeclaringClass(), CONSTRUCTOR_NAME, typeInfo, flagsMods(IS_CONSTRUCTOR, ctor.getModifiers()));
         // fill in vmtarget, vmindex while we have ctor in hand:
         MethodHandleNatives.init(this, ctor);
         assert(isResolved());
     }
     public MemberName(Field fld) {
         init(fld.getDeclaringClass(), fld.getName(), fld.getType(), flagsMods(IS_FIELD, fld.getModifiers()));
         // fill in vmtarget, vmindex while we have fld in hand:
         MethodHandleNatives.init(this, fld);
         assert(isResolved());
     }
     public MemberName(Class<?> type) {
         init(type.getDeclaringClass(), type.getSimpleName(), type, flagsMods(IS_TYPE, type.getModifiers()));
         vmindex = 0;  // isResolved
         assert(isResolved());
     }

     // bare-bones constructor; the JVM will fill it in
     MemberName() { }

     // locally useful cloner
     @Override protected MemberName clone() {
         try {
             return (MemberName) super.clone();
         } catch (CloneNotSupportedException ex) {
             throw new InternalError();
         }
      }

     // %%% define equals/hashcode?

     // Construction from symbolic parts, for queries:
     public MemberName(Class<?> defClass, String name, Class<?> type, int modifiers) {
         init(defClass, name, type, IS_FIELD | (modifiers & RECOGNIZED_MODIFIERS));
     }
     public MemberName(Class<?> defClass, String name, Class<?> type) {
         this(defClass, name, type, 0);
     }
     public MemberName(Class<?> defClass, String name, MethodType type, int modifiers) {
         int flagBit = (name.equals(CONSTRUCTOR_NAME) ? IS_CONSTRUCTOR : IS_METHOD);
         init(defClass, name, type, flagBit | (modifiers & RECOGNIZED_MODIFIERS));
     }
     public MemberName(Class<?> defClass, String name, MethodType type) {
         this(defClass, name, type, 0);
     }

     boolean isResolved() {
         return (vmindex != VM_INDEX_UNINITIALIZED);
     }

     public boolean hasReceiverTypeDispatch() {
         return (isMethod() && getVMIndex(Access.TOKEN) >= 0);
     }

     @Override
     public String toString() {
         if (isType())
             return type.toString();  // class java.lang.String
         // else it is a field, method, or constructor
         StringBuilder buf = new StringBuilder();
         if (!isResolved())
             buf.append("*.");
         if (getDeclaringClass() != null) {
             buf.append(getName(clazz));
             buf.append('.');
         }
         buf.append(getName());
         if (!isInvocable())  buf.append('/');
         buf.append(getName(getType()));
         /*
         buf.append('/');
         // key: Public, private, pRotected, sTatic, Final, sYnchronized,
         // transient/Varargs, native, (interface), abstract, sTrict, sYnthetic,
         // (annotation), Enum, (unused)
         final String FIELD_MOD_CHARS  = "PprTF?vt????Y?E?";
         final String METHOD_MOD_CHARS = "PprTFybVn?atY???";
         String modChars = (isInvocable() ? METHOD_MOD_CHARS : FIELD_MOD_CHARS);
         for (int i = 0; i < modChars.length(); i++) {
             if ((flags & (1 << i)) != 0) {
                 char mc = modChars.charAt(i);
                 if (mc != '.')
                     buf.append(mc);
             }
         }
          */
         return buf.toString();
     }
     private static String getName(Object obj) {
         if (obj instanceof Class<?>)
             return ((Class<?>)obj).getName();
         return String.valueOf(obj);
     }

     // Queries to the JVM:
     public int getVMIndex(Access token) {
         Access.check(token);
         if (!isResolved())
             throw newIllegalStateException("not resolved");
         return vmindex;
     }
 //    public Object getVMTarget(Access token) {
 //        Access.check(token);
 //        if (!isResolved())
 //            throw newIllegalStateException("not resolved");
 //        return vmtarget;
 //    }
     private RuntimeException newIllegalStateException(String message) {
         return new IllegalStateException(message+": "+this);
     }

     // handy shared exception makers (they simplify the common case code)
     public static RuntimeException newIllegalArgumentException(String message) {
         return new IllegalArgumentException(message);
     }
     public static NoAccessException newNoAccessException(MemberName name, Class<?> lookupClass) {
         return newNoAccessException("cannot access", name, lookupClass);
     }
     public static NoAccessException newNoAccessException(MemberName name, MethodHandles.Lookup lookup) {
         return newNoAccessException(name, lookup.lookupClass());
     }
     public static NoAccessException newNoAccessException(String message,
             MemberName name, Class<?> lookupClass) {
         message += ": " + name;
         if (lookupClass != null)  message += ", from " + lookupClass.getName();
         return new NoAccessException(message);
     }

     /** Actually making a query requires an access check. */
     public static Factory getFactory(Access token) {
         Access.check(token);
         return Factory.INSTANCE;
     }
     public static Factory getFactory() {
         return getFactory(Access.getToken());
     }
     public static class Factory {
         private Factory() { } // singleton pattern
         static Factory INSTANCE = new Factory();

         private static int ALLOWED_FLAGS = SEARCH_ALL_SUPERS | ALL_KINDS;

         /// Queries
         List<MemberName> getMembers(Class<?> defc,
                 String matchName, Object matchType,
                 int matchFlags, Class<?> lookupClass) {
             matchFlags &= ALLOWED_FLAGS;
             String matchSig = null;
             if (matchType != null) {
                 matchSig = BytecodeDescriptor.unparse(matchType);
                 if (matchSig.startsWith("("))
                     matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
                 else
                     matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
             }
             final int BUF_MAX = 0x2000;
             int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
             MemberName[] buf = newMemberBuffer(len1);
             int totalCount = 0;
             ArrayList<MemberName[]> bufs = null;
             int bufCount = 0;
             for (;;) {
                 bufCount = MethodHandleNatives.getMembers(defc,
                         matchName, matchSig, matchFlags,
                         lookupClass,
                         totalCount, buf);
                 if (bufCount <= buf.length) {
                     if (bufCount < 0)  bufCount = 0;
                     totalCount += bufCount;
                     break;
                 }
                 // JVM returned to us with an intentional overflow!
                 totalCount += buf.length;
                 int excess = bufCount - buf.length;
                 if (bufs == null)  bufs = new ArrayList<MemberName[]>(1);
                 bufs.add(buf);
                 int len2 = buf.length;
                 len2 = Math.max(len2, excess);
                 len2 = Math.max(len2, totalCount / 4);
                 buf = newMemberBuffer(Math.min(BUF_MAX, len2));
             }
             ArrayList<MemberName> result = new ArrayList<MemberName>(totalCount);
             if (bufs != null) {
                 for (MemberName[] buf0 : bufs) {
                     Collections.addAll(result, buf0);
                 }
             }
             result.addAll(Arrays.asList(buf).subList(0, bufCount));
             // Signature matching is not the same as type matching, since
             // one signature might correspond to several types.
             // So if matchType is a Class or MethodType, refilter the results.
             if (matchType != null && matchType != matchSig) {
                 for (Iterator<MemberName> it = result.iterator(); it.hasNext();) {
                     MemberName m = it.next();
                     if (!matchType.equals(m.getType()))
                         it.remove();
                 }
             }
             return result;
         }
         boolean resolveInPlace(MemberName m, boolean searchSupers, Class<?> lookupClass) {
             MethodHandleNatives.resolve(m, lookupClass);
             if (m.isResolved())  return true;
             int matchFlags = m.flags | (searchSupers ? SEARCH_ALL_SUPERS : 0);
             String matchSig = m.getSignature();
             MemberName[] buf = { m };
             int n = MethodHandleNatives.getMembers(m.getDeclaringClass(),
                     m.getName(), matchSig, matchFlags, lookupClass, 0, buf);
             if (n != 1)  return false;
             return m.isResolved();
         }
         public MemberName resolveOrNull(MemberName m, boolean searchSupers, Class<?> lookupClass) {
             MemberName result = m.clone();
             if (resolveInPlace(result, searchSupers, lookupClass))
                 return result;
             return null;
         }
         public MemberName resolveOrFail(MemberName m, boolean searchSupers, Class<?> lookupClass) {
             MemberName result = resolveOrNull(m, searchSupers, lookupClass);
             if (result != null)
                 return result;
             throw newNoAccessException(m, lookupClass);
         }
         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
                 Class<?> lookupClass) {
             return getMethods(defc, searchSupers, null, null, lookupClass);
         }
         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
                 String name, MethodType type, Class<?> lookupClass) {
             int matchFlags = IS_METHOD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
             return getMembers(defc, name, type, matchFlags, lookupClass);
         }
         public List<MemberName> getConstructors(Class<?> defc, Class<?> lookupClass) {
             return getMembers(defc, null, null, IS_CONSTRUCTOR, lookupClass);
         }
         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
                 Class<?> lookupClass) {
             return getFields(defc, searchSupers, null, null, lookupClass);
         }
         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
                 String name, Class<?> type, Class<?> lookupClass) {
             int matchFlags = IS_FIELD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
             return getMembers(defc, name, type, matchFlags, lookupClass);
         }
         public List<MemberName> getNestedTypes(Class<?> defc, boolean searchSupers,
                 Class<?> lookupClass) {
             int matchFlags = IS_TYPE | (searchSupers ? SEARCH_ALL_SUPERS : 0);
             return getMembers(defc, null, null, matchFlags, lookupClass);
         }
         private static MemberName[] newMemberBuffer(int length) {
             MemberName[] buf = new MemberName[length];
             // fill the buffer with dummy structs for the JVM to fill in
             for (int i = 0; i < length; i++)
                 buf[i] = new MemberName();
             return buf;
         }
     }

 //    static {
 //        System.out.println("Hello world!  My methods are:");
 //        System.out.println(Factory.INSTANCE.getMethods(MemberName.class, true, null));
 //    }
 }
	/*
	* Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.dyn;

	import sun.dyn.util.BytecodeDescriptor;
	import java.dyn.*;
	import java.lang.reflect.Constructor;
	import java.lang.reflect.Field;
	import java.lang.reflect.Method;
	import java.lang.reflect.Member;
	import java.lang.reflect.Modifier;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.Iterator;
	import java.util.List;
	import static sun.dyn.MethodHandleNatives.Constants.*;

	/**
	* Compact information which fully characterizes a method or field reference.
	* When resolved, it includes a direct pointer to JVM metadata.
	* This representation is stateless and only decriptive.
	* It provides no private information and no capability to use the member.
	* <p>
	* By contrast, a java.lang.reflect.Method contains fuller information
	* about the internals of a method (except its bytecodes) and also
	* allows invocation. A MemberName is much lighter than a reflect.Method,
	* since it contains about 7 fields to Method's 16 (plus its sub-arrays),
	* and those seven fields omit much of the information in Method.
	* @author jrose
	*/
	public final class MemberName implements Member, Cloneable {
	private Class<?> clazz; // class in which the method is defined
	private String name; // may be null if not yet materialized
	private Object type; // may be null if not yet materialized
	private int flags; // modifier bits; see reflect.Modifier

	private Object vmtarget; // VM-specific target value
	private int vmindex; // method index within class or interface

	{ vmindex = VM_INDEX_UNINITIALIZED; }

	public Class<?> getDeclaringClass() {
	if (clazz == null && isResolved()) {
	expandFromVM();
	}
	return clazz;
	}

	public ClassLoader getClassLoader() {
	return clazz.getClassLoader();
	}

	public String getName() {
	if (name == null) {
	expandFromVM();
	if (name == null) return null;
	}
	return name;
	}

	public MethodType getMethodType() {
	if (type == null) {
	expandFromVM();
	if (type == null) return null;
	}
	if (!isInvocable())
	throw newIllegalArgumentException("not invocable, no method type");
	if (type instanceof MethodType) {
	return (MethodType) type;
	}
	if (type instanceof String) {
	String sig = (String) type;
	MethodType res = MethodType.fromMethodDescriptorString(sig, getClassLoader());
	this.type = res;
	return res;
	}
	if (type instanceof Object[]) {
	Object[] typeInfo = (Object[]) type;
	Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
	Class<?> rtype = (Class<?>) typeInfo[0];
	MethodType res = MethodType.methodType(rtype, ptypes);
	this.type = res;
	return res;
	}
	throw new InternalError("bad method type "+type);
	}

	public MethodType getInvocationType() {
	MethodType itype = getMethodType();
	if (!isStatic())
	itype = itype.insertParameterTypes(0, clazz);
	return itype;
	}

	public Class<?>[] getParameterTypes() {
	return getMethodType().parameterArray();
	}

	public Class<?> getReturnType() {
	return getMethodType().returnType();
	}

	public Class<?> getFieldType() {
	if (type == null) {
	expandFromVM();
	if (type == null) return null;
	}
	if (isInvocable())
	throw newIllegalArgumentException("not a field or nested class, no simple type");
	if (type instanceof Class<?>) {
	return (Class<?>) type;
	}
	if (type instanceof String) {
	String sig = (String) type;
	MethodType mtype = MethodType.fromMethodDescriptorString("()"+sig, getClassLoader());
	Class<?> res = mtype.returnType();
	this.type = res;
	return res;
	}
	throw new InternalError("bad field type "+type);
	}

	public Object getType() {
	return (isInvocable() ? getMethodType() : getFieldType());
	}

	public String getSignature() {
	if (type == null) {
	expandFromVM();
	if (type == null) return null;
	}
	if (type instanceof String)
	return (String) type;
	if (isInvocable())
	return BytecodeDescriptor.unparse(getMethodType());
	else
	return BytecodeDescriptor.unparse(getFieldType());
	}

	public int getModifiers() {
	return (flags & RECOGNIZED_MODIFIERS);
	}

	private void setFlags(int flags) {
	this.flags = flags;
	assert(testAnyFlags(ALL_KINDS));
	}

	private boolean testFlags(int mask, int value) {
	return (flags & mask) == value;
	}
	private boolean testAllFlags(int mask) {
	return testFlags(mask, mask);
	}
	private boolean testAnyFlags(int mask) {
	return !testFlags(mask, 0);
	}

	public boolean isStatic() {
	return Modifier.isStatic(flags);
	}
	public boolean isPublic() {
	return Modifier.isPublic(flags);
	}
	public boolean isPrivate() {
	return Modifier.isPrivate(flags);
	}
	public boolean isProtected() {
	return Modifier.isProtected(flags);
	}
	public boolean isFinal() {
	return Modifier.isFinal(flags);
	}
	public boolean isAbstract() {
	return Modifier.isAbstract(flags);
	}
	// let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo

	// unofficial modifier flags, used by HotSpot:
	static final int BRIDGE = 0x00000040;
	static final int VARARGS = 0x00000080;
	static final int SYNTHETIC = 0x00001000;
	static final int ANNOTATION= 0x00002000;
	static final int ENUM = 0x00004000;
	public boolean isBridge() {
	return testAllFlags(IS_METHOD \| BRIDGE);
	}
	public boolean isVarargs() {
	return testAllFlags(VARARGS) && isInvocable();
	}
	public boolean isSynthetic() {
	return testAllFlags(SYNTHETIC);
	}

	static final String CONSTRUCTOR_NAME = "<init>"; // the ever-popular

	// modifiers exported by the JVM:
	static final int RECOGNIZED_MODIFIERS = 0xFFFF;

	// private flags, not part of RECOGNIZED_MODIFIERS:
	static final int
	IS_METHOD = MN_IS_METHOD, // method (not constructor)
	IS_CONSTRUCTOR = MN_IS_CONSTRUCTOR, // constructor
	IS_FIELD = MN_IS_FIELD, // field
	IS_TYPE = MN_IS_TYPE; // nested type
	static final int // for MethodHandleNatives.getMembers
	SEARCH_SUPERCLASSES = MN_SEARCH_SUPERCLASSES,
	SEARCH_INTERFACES = MN_SEARCH_INTERFACES;

	static final int ALL_ACCESS = Modifier.PUBLIC \| Modifier.PRIVATE \| Modifier.PROTECTED;
	static final int ALL_KINDS = IS_METHOD \| IS_CONSTRUCTOR \| IS_FIELD \| IS_TYPE;
	static final int IS_INVOCABLE = IS_METHOD \| IS_CONSTRUCTOR;
	static final int IS_FIELD_OR_METHOD = IS_METHOD \| IS_FIELD;
	static final int SEARCH_ALL_SUPERS = SEARCH_SUPERCLASSES \| SEARCH_INTERFACES;

	public boolean isInvocable() {
	return testAnyFlags(IS_INVOCABLE);
	}
	public boolean isFieldOrMethod() {
	return testAnyFlags(IS_FIELD_OR_METHOD);
	}
	public boolean isMethod() {
	return testAllFlags(IS_METHOD);
	}
	public boolean isConstructor() {
	return testAllFlags(IS_CONSTRUCTOR);
	}
	public boolean isField() {
	return testAllFlags(IS_FIELD);
	}
	public boolean isType() {
	return testAllFlags(IS_TYPE);
	}
	public boolean isPackage() {
	return !testAnyFlags(ALL_ACCESS);
	}

	/** Initialize a query. It is not resolved. */
	private void init(Class<?> defClass, String name, Object type, int flags) {
	// defining class is allowed to be null (for a naked name/type pair)
	name.toString(); // null check
	type.equals(type); // null check
	// fill in fields:
	this.clazz = defClass;
	this.name = name;
	this.type = type;
	setFlags(flags);
	assert(!isResolved());
	}

	private void expandFromVM() {
	if (!isResolved()) return;
	if (type instanceof Object[])
	type = null; // don't saddle JVM w/ typeInfo
	MethodHandleNatives.expand(this);
	}

	// Capturing information from the Core Reflection API:
	private static int flagsMods(int flags, int mods) {
	assert((flags & RECOGNIZED_MODIFIERS) == 0);
	assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
	return flags \| mods;
	}
	public MemberName(Method m) {
	Object[] typeInfo = { m.getReturnType(), m.getParameterTypes() };
	init(m.getDeclaringClass(), m.getName(), typeInfo, flagsMods(IS_METHOD, m.getModifiers()));
	// fill in vmtarget, vmindex while we have m in hand:
	MethodHandleNatives.init(this, m);
	assert(isResolved());
	}
	public MemberName(Constructor ctor) {
	Object[] typeInfo = { void.class, ctor.getParameterTypes() };
	init(ctor.getDeclaringClass(), CONSTRUCTOR_NAME, typeInfo, flagsMods(IS_CONSTRUCTOR, ctor.getModifiers()));
	// fill in vmtarget, vmindex while we have ctor in hand:
	MethodHandleNatives.init(this, ctor);
	assert(isResolved());
	}
	public MemberName(Field fld) {
	init(fld.getDeclaringClass(), fld.getName(), fld.getType(), flagsMods(IS_FIELD, fld.getModifiers()));
	// fill in vmtarget, vmindex while we have fld in hand:
	MethodHandleNatives.init(this, fld);
	assert(isResolved());
	}
	public MemberName(Class<?> type) {
	init(type.getDeclaringClass(), type.getSimpleName(), type, flagsMods(IS_TYPE, type.getModifiers()));
	vmindex = 0; // isResolved
	assert(isResolved());
	}

	// bare-bones constructor; the JVM will fill it in
	MemberName() { }

	// locally useful cloner
	@Override protected MemberName clone() {
	try {
	return (MemberName) super.clone();
	} catch (CloneNotSupportedException ex) {
	throw new InternalError();
	}
	}

	// %%% define equals/hashcode?

	// Construction from symbolic parts, for queries:
	public MemberName(Class<?> defClass, String name, Class<?> type, int modifiers) {
	init(defClass, name, type, IS_FIELD \| (modifiers & RECOGNIZED_MODIFIERS));
	}
	public MemberName(Class<?> defClass, String name, Class<?> type) {
	this(defClass, name, type, 0);
	}
	public MemberName(Class<?> defClass, String name, MethodType type, int modifiers) {
	int flagBit = (name.equals(CONSTRUCTOR_NAME) ? IS_CONSTRUCTOR : IS_METHOD);
	init(defClass, name, type, flagBit \| (modifiers & RECOGNIZED_MODIFIERS));
	}
	public MemberName(Class<?> defClass, String name, MethodType type) {
	this(defClass, name, type, 0);
	}

	boolean isResolved() {
	return (vmindex != VM_INDEX_UNINITIALIZED);
	}

	public boolean hasReceiverTypeDispatch() {
	return (isMethod() && getVMIndex(Access.TOKEN) >= 0);
	}

	@Override
	public String toString() {
	if (isType())
	return type.toString(); // class java.lang.String
	// else it is a field, method, or constructor
	StringBuilder buf = new StringBuilder();
	if (!isResolved())
	buf.append("*.");
	if (getDeclaringClass() != null) {
	buf.append(getName(clazz));
	buf.append('.');
	}
	buf.append(getName());
	if (!isInvocable()) buf.append('/');
	buf.append(getName(getType()));
	/*
	buf.append('/');
	// key: Public, private, pRotected, sTatic, Final, sYnchronized,
	// transient/Varargs, native, (interface), abstract, sTrict, sYnthetic,
	// (annotation), Enum, (unused)
	final String FIELD_MOD_CHARS = "PprTF?vt????Y?E?";
	final String METHOD_MOD_CHARS = "PprTFybVn?atY???";
	String modChars = (isInvocable() ? METHOD_MOD_CHARS : FIELD_MOD_CHARS);
	for (int i = 0; i < modChars.length(); i++) {
	if ((flags & (1 << i)) != 0) {
	char mc = modChars.charAt(i);
	if (mc != '.')
	buf.append(mc);
	}
	}
	*/
	return buf.toString();
	}
	private static String getName(Object obj) {
	if (obj instanceof Class<?>)
	return ((Class<?>)obj).getName();
	return String.valueOf(obj);
	}

	// Queries to the JVM:
	public int getVMIndex(Access token) {
	Access.check(token);
	if (!isResolved())
	throw newIllegalStateException("not resolved");
	return vmindex;
	}
	// public Object getVMTarget(Access token) {
	// Access.check(token);
	// if (!isResolved())
	// throw newIllegalStateException("not resolved");
	// return vmtarget;
	// }
	private RuntimeException newIllegalStateException(String message) {
	return new IllegalStateException(message+": "+this);
	}

	// handy shared exception makers (they simplify the common case code)
	public static RuntimeException newIllegalArgumentException(String message) {
	return new IllegalArgumentException(message);
	}
	public static NoAccessException newNoAccessException(MemberName name, Class<?> lookupClass) {
	return newNoAccessException("cannot access", name, lookupClass);
	}
	public static NoAccessException newNoAccessException(MemberName name, MethodHandles.Lookup lookup) {
	return newNoAccessException(name, lookup.lookupClass());
	}
	public static NoAccessException newNoAccessException(String message,
	MemberName name, Class<?> lookupClass) {
	message += ": " + name;
	if (lookupClass != null) message += ", from " + lookupClass.getName();
	return new NoAccessException(message);
	}

	/** Actually making a query requires an access check. */
	public static Factory getFactory(Access token) {
	Access.check(token);
	return Factory.INSTANCE;
	}
	public static Factory getFactory() {
	return getFactory(Access.getToken());
	}
	public static class Factory {
	private Factory() { } // singleton pattern
	static Factory INSTANCE = new Factory();

	private static int ALLOWED_FLAGS = SEARCH_ALL_SUPERS \| ALL_KINDS;

	/// Queries
	List<MemberName> getMembers(Class<?> defc,
	String matchName, Object matchType,
	int matchFlags, Class<?> lookupClass) {
	matchFlags &= ALLOWED_FLAGS;
	String matchSig = null;
	if (matchType != null) {
	matchSig = BytecodeDescriptor.unparse(matchType);
	if (matchSig.startsWith("("))
	matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
	else
	matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
	}
	final int BUF_MAX = 0x2000;
	int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
	MemberName[] buf = newMemberBuffer(len1);
	int totalCount = 0;
	ArrayList<MemberName[]> bufs = null;
	int bufCount = 0;
	for (;;) {
	bufCount = MethodHandleNatives.getMembers(defc,
	matchName, matchSig, matchFlags,
	lookupClass,
	totalCount, buf);
	if (bufCount <= buf.length) {
	if (bufCount < 0) bufCount = 0;
	totalCount += bufCount;
	break;
	}
	// JVM returned to us with an intentional overflow!
	totalCount += buf.length;
	int excess = bufCount - buf.length;
	if (bufs == null) bufs = new ArrayList<MemberName[]>(1);
	bufs.add(buf);
	int len2 = buf.length;
	len2 = Math.max(len2, excess);
	len2 = Math.max(len2, totalCount / 4);
	buf = newMemberBuffer(Math.min(BUF_MAX, len2));
	}
	ArrayList<MemberName> result = new ArrayList<MemberName>(totalCount);
	if (bufs != null) {
	for (MemberName[] buf0 : bufs) {
	Collections.addAll(result, buf0);
	}
	}
	result.addAll(Arrays.asList(buf).subList(0, bufCount));
	// Signature matching is not the same as type matching, since
	// one signature might correspond to several types.
	// So if matchType is a Class or MethodType, refilter the results.
	if (matchType != null && matchType != matchSig) {
	for (Iterator<MemberName> it = result.iterator(); it.hasNext();) {
	MemberName m = it.next();
	if (!matchType.equals(m.getType()))
	it.remove();
	}
	}
	return result;
	}
	boolean resolveInPlace(MemberName m, boolean searchSupers, Class<?> lookupClass) {
	MethodHandleNatives.resolve(m, lookupClass);
	if (m.isResolved()) return true;
	int matchFlags = m.flags \| (searchSupers ? SEARCH_ALL_SUPERS : 0);
	String matchSig = m.getSignature();
	MemberName[] buf = { m };
	int n = MethodHandleNatives.getMembers(m.getDeclaringClass(),
	m.getName(), matchSig, matchFlags, lookupClass, 0, buf);
	if (n != 1) return false;
	return m.isResolved();
	}
	public MemberName resolveOrNull(MemberName m, boolean searchSupers, Class<?> lookupClass) {
	MemberName result = m.clone();
	if (resolveInPlace(result, searchSupers, lookupClass))
	return result;
	return null;
	}
	public MemberName resolveOrFail(MemberName m, boolean searchSupers, Class<?> lookupClass) {
	MemberName result = resolveOrNull(m, searchSupers, lookupClass);
	if (result != null)
	return result;
	throw newNoAccessException(m, lookupClass);
	}
	public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
	Class<?> lookupClass) {
	return getMethods(defc, searchSupers, null, null, lookupClass);
	}
	public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
	String name, MethodType type, Class<?> lookupClass) {
	int matchFlags = IS_METHOD \| (searchSupers ? SEARCH_ALL_SUPERS : 0);
	return getMembers(defc, name, type, matchFlags, lookupClass);
	}
	public List<MemberName> getConstructors(Class<?> defc, Class<?> lookupClass) {
	return getMembers(defc, null, null, IS_CONSTRUCTOR, lookupClass);
	}
	public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
	Class<?> lookupClass) {
	return getFields(defc, searchSupers, null, null, lookupClass);
	}
	public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
	String name, Class<?> type, Class<?> lookupClass) {
	int matchFlags = IS_FIELD \| (searchSupers ? SEARCH_ALL_SUPERS : 0);
	return getMembers(defc, name, type, matchFlags, lookupClass);
	}
	public List<MemberName> getNestedTypes(Class<?> defc, boolean searchSupers,
	Class<?> lookupClass) {
	int matchFlags = IS_TYPE \| (searchSupers ? SEARCH_ALL_SUPERS : 0);
	return getMembers(defc, null, null, matchFlags, lookupClass);
	}
	private static MemberName[] newMemberBuffer(int length) {
	MemberName[] buf = new MemberName[length];
	// fill the buffer with dummy structs for the JVM to fill in
	for (int i = 0; i < length; i++)
	buf[i] = new MemberName();
	return buf;
	}
	}

	// static {
	// System.out.println("Hello world! My methods are:");
	// System.out.println(Factory.INSTANCE.getMethods(MemberName.class, true, null));
	// }
	}