jaroslav@1646: /*
jaroslav@1646:  * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
jaroslav@1646:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@1646:  *
jaroslav@1646:  * This code is free software; you can redistribute it and/or modify it
jaroslav@1646:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@1646:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@1646:  * particular file as subject to the "Classpath" exception as provided
jaroslav@1646:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@1646:  *
jaroslav@1646:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@1646:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@1646:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@1646:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@1646:  * accompanied this code).
jaroslav@1646:  *
jaroslav@1646:  * You should have received a copy of the GNU General Public License version
jaroslav@1646:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@1646:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@1646:  *
jaroslav@1646:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@1646:  * or visit www.oracle.com if you need additional information or have any
jaroslav@1646:  * questions.
jaroslav@1646:  */
jaroslav@1646: 
jaroslav@1646: package java.lang.invoke;
jaroslav@1646: 
jaroslav@1646: import sun.invoke.util.BytecodeDescriptor;
jaroslav@1646: import sun.invoke.util.VerifyAccess;
jaroslav@1646: 
jaroslav@1646: import java.lang.reflect.Constructor;
jaroslav@1646: import java.lang.reflect.Field;
jaroslav@1646: import java.lang.reflect.Method;
jaroslav@1646: import java.lang.reflect.Member;
jaroslav@1646: import java.lang.reflect.Modifier;
jaroslav@1646: import java.util.ArrayList;
jaroslav@1646: import java.util.Arrays;
jaroslav@1646: import java.util.Collections;
jaroslav@1646: import java.util.Iterator;
jaroslav@1646: import java.util.List;
jaroslav@1646: import static java.lang.invoke.MethodHandleNatives.Constants.*;
jaroslav@1646: import static java.lang.invoke.MethodHandleStatics.*;
jaroslav@1646: import java.util.Objects;
jaroslav@1646: 
jaroslav@1646: /**
jaroslav@1646:  * A {@code MemberName} is a compact symbolic datum which fully characterizes
jaroslav@1646:  * a method or field reference.
jaroslav@1646:  * A member name refers to a field, method, constructor, or member type.
jaroslav@1646:  * Every member name has a simple name (a string) and a type (either a Class or MethodType).
jaroslav@1646:  * A member name may also have a non-null declaring class, or it may be simply
jaroslav@1646:  * a naked name/type pair.
jaroslav@1646:  * A member name may also have non-zero modifier flags.
jaroslav@1646:  * Finally, a member name may be either resolved or unresolved.
jaroslav@1646:  * If it is resolved, the existence of the named
jaroslav@1646:  * <p>
jaroslav@1646:  * Whether resolved or not, a member name provides no access rights or
jaroslav@1646:  * invocation capability to its possessor.  It is merely a compact
jaroslav@1646:  * representation of all symbolic information necessary to link to
jaroslav@1646:  * and properly use the named member.
jaroslav@1646:  * <p>
jaroslav@1646:  * When resolved, a member name's internal implementation may include references to JVM metadata.
jaroslav@1646:  * This representation is stateless and only decriptive.
jaroslav@1646:  * It provides no private information and no capability to use the member.
jaroslav@1646:  * <p>
jaroslav@1646:  * By contrast, a {@linkplain java.lang.reflect.Method} contains fuller information
jaroslav@1646:  * about the internals of a method (except its bytecodes) and also
jaroslav@1646:  * allows invocation.  A MemberName is much lighter than a Method,
jaroslav@1646:  * since it contains about 7 fields to the 16 of Method (plus its sub-arrays),
jaroslav@1646:  * and those seven fields omit much of the information in Method.
jaroslav@1646:  * @author jrose
jaroslav@1646:  */
jaroslav@1646: /*non-public*/ final class MemberName implements Member, Cloneable {
jaroslav@1646:     private Class<?> clazz;       // class in which the method is defined
jaroslav@1646:     private String   name;        // may be null if not yet materialized
jaroslav@1646:     private Object   type;        // may be null if not yet materialized
jaroslav@1646:     private int      flags;       // modifier bits; see reflect.Modifier
jaroslav@1646:     //@Injected JVM_Method* vmtarget;
jaroslav@1646:     //@Injected int         vmindex;
jaroslav@1646:     private Object   resolution;  // if null, this guy is resolved
jaroslav@1646: 
jaroslav@1646:     /** Return the declaring class of this member.
jaroslav@1646:      *  In the case of a bare name and type, the declaring class will be null.
jaroslav@1646:      */
jaroslav@1646:     public Class<?> getDeclaringClass() {
jaroslav@1646:         return clazz;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method producing the class loader of the declaring class. */
jaroslav@1646:     public ClassLoader getClassLoader() {
jaroslav@1646:         return clazz.getClassLoader();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the simple name of this member.
jaroslav@1646:      *  For a type, it is the same as {@link Class#getSimpleName}.
jaroslav@1646:      *  For a method or field, it is the simple name of the member.
jaroslav@1646:      *  For a constructor, it is always {@code "&lt;init&gt;"}.
jaroslav@1646:      */
jaroslav@1646:     public String getName() {
jaroslav@1646:         if (name == null) {
jaroslav@1646:             expandFromVM();
jaroslav@1646:             if (name == null) {
jaroslav@1646:                 return null;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         return name;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public MethodType getMethodOrFieldType() {
jaroslav@1646:         if (isInvocable())
jaroslav@1646:             return getMethodType();
jaroslav@1646:         if (isGetter())
jaroslav@1646:             return MethodType.methodType(getFieldType());
jaroslav@1646:         if (isSetter())
jaroslav@1646:             return MethodType.methodType(void.class, getFieldType());
jaroslav@1646:         throw new InternalError("not a method or field: "+this);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the declared type of this member, which
jaroslav@1646:      *  must be a method or constructor.
jaroslav@1646:      */
jaroslav@1646:     public MethodType getMethodType() {
jaroslav@1646:         if (type == null) {
jaroslav@1646:             expandFromVM();
jaroslav@1646:             if (type == null) {
jaroslav@1646:                 return null;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (!isInvocable()) {
jaroslav@1646:             throw newIllegalArgumentException("not invocable, no method type");
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         {
jaroslav@1646:             // Get a snapshot of type which doesn't get changed by racing threads.
jaroslav@1646:             final Object type = this.type;
jaroslav@1646:             if (type instanceof MethodType) {
jaroslav@1646:                 return (MethodType) type;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // type is not a MethodType yet.  Convert it thread-safely.
jaroslav@1646:         synchronized (this) {
jaroslav@1646:             if (type instanceof String) {
jaroslav@1646:                 String sig = (String) type;
jaroslav@1646:                 MethodType res = MethodType.fromMethodDescriptorString(sig, getClassLoader());
jaroslav@1646:                 type = res;
jaroslav@1646:             } else if (type instanceof Object[]) {
jaroslav@1646:                 Object[] typeInfo = (Object[]) type;
jaroslav@1646:                 Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
jaroslav@1646:                 Class<?> rtype = (Class<?>) typeInfo[0];
jaroslav@1646:                 MethodType res = MethodType.methodType(rtype, ptypes);
jaroslav@1646:                 type = res;
jaroslav@1646:             }
jaroslav@1646:             // Make sure type is a MethodType for racing threads.
jaroslav@1646:             assert type instanceof MethodType : "bad method type " + type;
jaroslav@1646:         }
jaroslav@1646:         return (MethodType) type;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the actual type under which this method or constructor must be invoked.
jaroslav@1646:      *  For non-static methods or constructors, this is the type with a leading parameter,
jaroslav@1646:      *  a reference to declaring class.  For static methods, it is the same as the declared type.
jaroslav@1646:      */
jaroslav@1646:     public MethodType getInvocationType() {
jaroslav@1646:         MethodType itype = getMethodOrFieldType();
jaroslav@1646:         if (isConstructor() && getReferenceKind() == REF_newInvokeSpecial)
jaroslav@1646:             return itype.changeReturnType(clazz);
jaroslav@1646:         if (!isStatic())
jaroslav@1646:             return itype.insertParameterTypes(0, clazz);
jaroslav@1646:         return itype;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method producing the parameter types of the method type. */
jaroslav@1646:     public Class<?>[] getParameterTypes() {
jaroslav@1646:         return getMethodType().parameterArray();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method producing the return type of the method type. */
jaroslav@1646:     public Class<?> getReturnType() {
jaroslav@1646:         return getMethodType().returnType();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the declared type of this member, which
jaroslav@1646:      *  must be a field or type.
jaroslav@1646:      *  If it is a type member, that type itself is returned.
jaroslav@1646:      */
jaroslav@1646:     public Class<?> getFieldType() {
jaroslav@1646:         if (type == null) {
jaroslav@1646:             expandFromVM();
jaroslav@1646:             if (type == null) {
jaroslav@1646:                 return null;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (isInvocable()) {
jaroslav@1646:             throw newIllegalArgumentException("not a field or nested class, no simple type");
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         {
jaroslav@1646:             // Get a snapshot of type which doesn't get changed by racing threads.
jaroslav@1646:             final Object type = this.type;
jaroslav@1646:             if (type instanceof Class<?>) {
jaroslav@1646:                 return (Class<?>) type;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646: 
jaroslav@1646:         // type is not a Class yet.  Convert it thread-safely.
jaroslav@1646:         synchronized (this) {
jaroslav@1646:             if (type instanceof String) {
jaroslav@1646:                 String sig = (String) type;
jaroslav@1646:                 MethodType mtype = MethodType.fromMethodDescriptorString("()"+sig, getClassLoader());
jaroslav@1646:                 Class<?> res = mtype.returnType();
jaroslav@1646:                 type = res;
jaroslav@1646:             }
jaroslav@1646:             // Make sure type is a Class for racing threads.
jaroslav@1646:             assert type instanceof Class<?> : "bad field type " + type;
jaroslav@1646:         }
jaroslav@1646:         return (Class<?>) type;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method to produce either the method type or field type of this member. */
jaroslav@1646:     public Object getType() {
jaroslav@1646:         return (isInvocable() ? getMethodType() : getFieldType());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method to produce the signature of this member,
jaroslav@1646:      *  used within the class file format to describe its type.
jaroslav@1646:      */
jaroslav@1646:     public String getSignature() {
jaroslav@1646:         if (type == null) {
jaroslav@1646:             expandFromVM();
jaroslav@1646:             if (type == null) {
jaroslav@1646:                 return null;
jaroslav@1646:             }
jaroslav@1646:         }
jaroslav@1646:         if (isInvocable())
jaroslav@1646:             return BytecodeDescriptor.unparse(getMethodType());
jaroslav@1646:         else
jaroslav@1646:             return BytecodeDescriptor.unparse(getFieldType());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the modifier flags of this member.
jaroslav@1646:      *  @see java.lang.reflect.Modifier
jaroslav@1646:      */
jaroslav@1646:     public int getModifiers() {
jaroslav@1646:         return (flags & RECOGNIZED_MODIFIERS);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Return the reference kind of this member, or zero if none.
jaroslav@1646:      */
jaroslav@1646:     public byte getReferenceKind() {
jaroslav@1646:         return (byte) ((flags >>> MN_REFERENCE_KIND_SHIFT) & MN_REFERENCE_KIND_MASK);
jaroslav@1646:     }
jaroslav@1646:     private boolean referenceKindIsConsistent() {
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         if (refKind == REF_NONE)  return isType();
jaroslav@1646:         if (isField()) {
jaroslav@1646:             assert(staticIsConsistent());
jaroslav@1646:             assert(MethodHandleNatives.refKindIsField(refKind));
jaroslav@1646:         } else if (isConstructor()) {
jaroslav@1646:             assert(refKind == REF_newInvokeSpecial || refKind == REF_invokeSpecial);
jaroslav@1646:         } else if (isMethod()) {
jaroslav@1646:             assert(staticIsConsistent());
jaroslav@1646:             assert(MethodHandleNatives.refKindIsMethod(refKind));
jaroslav@1646:             if (clazz.isInterface())
jaroslav@1646:                 assert(refKind == REF_invokeInterface ||
jaroslav@1646:                        refKind == REF_invokeStatic    ||
jaroslav@1646:                        refKind == REF_invokeSpecial   ||
jaroslav@1646:                        refKind == REF_invokeVirtual && isObjectPublicMethod());
jaroslav@1646:         } else {
jaroslav@1646:             assert(false);
jaroslav@1646:         }
jaroslav@1646:         return true;
jaroslav@1646:     }
jaroslav@1646:     private boolean isObjectPublicMethod() {
jaroslav@1646:         if (clazz == Object.class)  return true;
jaroslav@1646:         MethodType mtype = getMethodType();
jaroslav@1646:         if (name.equals("toString") && mtype.returnType() == String.class && mtype.parameterCount() == 0)
jaroslav@1646:             return true;
jaroslav@1646:         if (name.equals("hashCode") && mtype.returnType() == int.class && mtype.parameterCount() == 0)
jaroslav@1646:             return true;
jaroslav@1646:         if (name.equals("equals") && mtype.returnType() == boolean.class && mtype.parameterCount() == 1 && mtype.parameterType(0) == Object.class)
jaroslav@1646:             return true;
jaroslav@1646:         return false;
jaroslav@1646:     }
jaroslav@1646:     /*non-public*/ boolean referenceKindIsConsistentWith(int originalRefKind) {
jaroslav@1646:         int refKind = getReferenceKind();
jaroslav@1646:         if (refKind == originalRefKind)  return true;
jaroslav@1646:         switch (originalRefKind) {
jaroslav@1646:         case REF_invokeInterface:
jaroslav@1646:             // Looking up an interface method, can get (e.g.) Object.hashCode
jaroslav@1646:             assert(refKind == REF_invokeVirtual ||
jaroslav@1646:                    refKind == REF_invokeSpecial) : this;
jaroslav@1646:             return true;
jaroslav@1646:         case REF_invokeVirtual:
jaroslav@1646:         case REF_newInvokeSpecial:
jaroslav@1646:             // Looked up a virtual, can get (e.g.) final String.hashCode.
jaroslav@1646:             assert(refKind == REF_invokeSpecial) : this;
jaroslav@1646:             return true;
jaroslav@1646:         }
jaroslav@1646:         assert(false) : this+" != "+MethodHandleNatives.refKindName((byte)originalRefKind);
jaroslav@1646:         return true;
jaroslav@1646:     }
jaroslav@1646:     private boolean staticIsConsistent() {
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         return MethodHandleNatives.refKindIsStatic(refKind) == isStatic() || getModifiers() == 0;
jaroslav@1646:     }
jaroslav@1646:     private boolean vminfoIsConsistent() {
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         assert(isResolved());  // else don't call
jaroslav@1646:         Object vminfo = MethodHandleNatives.getMemberVMInfo(this);
jaroslav@1646:         assert(vminfo instanceof Object[]);
jaroslav@1646:         long vmindex = (Long) ((Object[])vminfo)[0];
jaroslav@1646:         Object vmtarget = ((Object[])vminfo)[1];
jaroslav@1646:         if (MethodHandleNatives.refKindIsField(refKind)) {
jaroslav@1646:             assert(vmindex >= 0) : vmindex + ":" + this;
jaroslav@1646:             assert(vmtarget instanceof Class);
jaroslav@1646:         } else {
jaroslav@1646:             if (MethodHandleNatives.refKindDoesDispatch(refKind))
jaroslav@1646:                 assert(vmindex >= 0) : vmindex + ":" + this;
jaroslav@1646:             else
jaroslav@1646:                 assert(vmindex < 0) : vmindex;
jaroslav@1646:             assert(vmtarget instanceof MemberName) : vmtarget + " in " + this;
jaroslav@1646:         }
jaroslav@1646:         return true;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private MemberName changeReferenceKind(byte refKind, byte oldKind) {
jaroslav@1646:         assert(getReferenceKind() == oldKind);
jaroslav@1646:         assert(MethodHandleNatives.refKindIsValid(refKind));
jaroslav@1646:         flags += (((int)refKind - oldKind) << MN_REFERENCE_KIND_SHIFT);
jaroslav@1646: //        if (isConstructor() && refKind != REF_newInvokeSpecial)
jaroslav@1646: //            flags += (IS_METHOD - IS_CONSTRUCTOR);
jaroslav@1646: //        else if (refKind == REF_newInvokeSpecial && isMethod())
jaroslav@1646: //            flags += (IS_CONSTRUCTOR - IS_METHOD);
jaroslav@1646:         return this;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private boolean testFlags(int mask, int value) {
jaroslav@1646:         return (flags & mask) == value;
jaroslav@1646:     }
jaroslav@1646:     private boolean testAllFlags(int mask) {
jaroslav@1646:         return testFlags(mask, mask);
jaroslav@1646:     }
jaroslav@1646:     private boolean testAnyFlags(int mask) {
jaroslav@1646:         return !testFlags(mask, 0);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method to query if this member is a method handle invocation (invoke or invokeExact). */
jaroslav@1646:     public boolean isMethodHandleInvoke() {
jaroslav@1646:         final int bits = MH_INVOKE_MODS;
jaroslav@1646:         final int negs = Modifier.STATIC;
jaroslav@1646:         if (testFlags(bits | negs, bits) &&
jaroslav@1646:             clazz == MethodHandle.class) {
jaroslav@1646:             return isMethodHandleInvokeName(name);
jaroslav@1646:         }
jaroslav@1646:         return false;
jaroslav@1646:     }
jaroslav@1646:     public static boolean isMethodHandleInvokeName(String name) {
jaroslav@1646:         return name.equals("invoke") || name.equals("invokeExact");
jaroslav@1646:     }
jaroslav@1646:     private static final int MH_INVOKE_MODS = Modifier.NATIVE | Modifier.FINAL | Modifier.PUBLIC;
jaroslav@1646: 
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isStatic() {
jaroslav@1646:         return Modifier.isStatic(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isPublic() {
jaroslav@1646:         return Modifier.isPublic(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isPrivate() {
jaroslav@1646:         return Modifier.isPrivate(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isProtected() {
jaroslav@1646:         return Modifier.isProtected(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isFinal() {
jaroslav@1646:         return Modifier.isFinal(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query whether this member or its defining class is final. */
jaroslav@1646:     public boolean canBeStaticallyBound() {
jaroslav@1646:         return Modifier.isFinal(flags | clazz.getModifiers());
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isVolatile() {
jaroslav@1646:         return Modifier.isVolatile(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isAbstract() {
jaroslav@1646:         return Modifier.isAbstract(flags);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member. */
jaroslav@1646:     public boolean isNative() {
jaroslav@1646:         return Modifier.isNative(flags);
jaroslav@1646:     }
jaroslav@1646:     // let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo
jaroslav@1646: 
jaroslav@1646:     // unofficial modifier flags, used by HotSpot:
jaroslav@1646:     static final int BRIDGE    = 0x00000040;
jaroslav@1646:     static final int VARARGS   = 0x00000080;
jaroslav@1646:     static final int SYNTHETIC = 0x00001000;
jaroslav@1646:     static final int ANNOTATION= 0x00002000;
jaroslav@1646:     static final int ENUM      = 0x00004000;
jaroslav@1646:     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
jaroslav@1646:     public boolean isBridge() {
jaroslav@1646:         return testAllFlags(IS_METHOD | BRIDGE);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
jaroslav@1646:     public boolean isVarargs() {
jaroslav@1646:         return testAllFlags(VARARGS) && isInvocable();
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
jaroslav@1646:     public boolean isSynthetic() {
jaroslav@1646:         return testAllFlags(SYNTHETIC);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     static final String CONSTRUCTOR_NAME = "<init>";  // the ever-popular
jaroslav@1646: 
jaroslav@1646:     // modifiers exported by the JVM:
jaroslav@1646:     static final int RECOGNIZED_MODIFIERS = 0xFFFF;
jaroslav@1646: 
jaroslav@1646:     // private flags, not part of RECOGNIZED_MODIFIERS:
jaroslav@1646:     static final int
jaroslav@1646:             IS_METHOD        = MN_IS_METHOD,        // method (not constructor)
jaroslav@1646:             IS_CONSTRUCTOR   = MN_IS_CONSTRUCTOR,   // constructor
jaroslav@1646:             IS_FIELD         = MN_IS_FIELD,         // field
jaroslav@1646:             IS_TYPE          = MN_IS_TYPE,          // nested type
jaroslav@1646:             CALLER_SENSITIVE = MN_CALLER_SENSITIVE; // @CallerSensitive annotation detected
jaroslav@1646: 
jaroslav@1646:     static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
jaroslav@1646:     static final int ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE;
jaroslav@1646:     static final int IS_INVOCABLE = IS_METHOD | IS_CONSTRUCTOR;
jaroslav@1646:     static final int IS_FIELD_OR_METHOD = IS_METHOD | IS_FIELD;
jaroslav@1646:     static final int SEARCH_ALL_SUPERS = MN_SEARCH_SUPERCLASSES | MN_SEARCH_INTERFACES;
jaroslav@1646: 
jaroslav@1646:     /** Utility method to query whether this member is a method or constructor. */
jaroslav@1646:     public boolean isInvocable() {
jaroslav@1646:         return testAnyFlags(IS_INVOCABLE);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query whether this member is a method, constructor, or field. */
jaroslav@1646:     public boolean isFieldOrMethod() {
jaroslav@1646:         return testAnyFlags(IS_FIELD_OR_METHOD);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member is a method. */
jaroslav@1646:     public boolean isMethod() {
jaroslav@1646:         return testAllFlags(IS_METHOD);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member is a constructor. */
jaroslav@1646:     public boolean isConstructor() {
jaroslav@1646:         return testAllFlags(IS_CONSTRUCTOR);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member is a field. */
jaroslav@1646:     public boolean isField() {
jaroslav@1646:         return testAllFlags(IS_FIELD);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member is a type. */
jaroslav@1646:     public boolean isType() {
jaroslav@1646:         return testAllFlags(IS_TYPE);
jaroslav@1646:     }
jaroslav@1646:     /** Utility method to query whether this member is neither public, private, nor protected. */
jaroslav@1646:     public boolean isPackage() {
jaroslav@1646:         return !testAnyFlags(ALL_ACCESS);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member has a CallerSensitive annotation. */
jaroslav@1646:     public boolean isCallerSensitive() {
jaroslav@1646:         return testAllFlags(CALLER_SENSITIVE);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Utility method to query whether this member is accessible from a given lookup class. */
jaroslav@1646:     public boolean isAccessibleFrom(Class<?> lookupClass) {
jaroslav@1646:         return VerifyAccess.isMemberAccessible(this.getDeclaringClass(), this.getDeclaringClass(), flags,
jaroslav@1646:                                                lookupClass, ALL_ACCESS|MethodHandles.Lookup.PACKAGE);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Initialize a query.   It is not resolved. */
jaroslav@1646:     private void init(Class<?> defClass, String name, Object type, int flags) {
jaroslav@1646:         // defining class is allowed to be null (for a naked name/type pair)
jaroslav@1646:         //name.toString();  // null check
jaroslav@1646:         //type.equals(type);  // null check
jaroslav@1646:         // fill in fields:
jaroslav@1646:         this.clazz = defClass;
jaroslav@1646:         this.name = name;
jaroslav@1646:         this.type = type;
jaroslav@1646:         this.flags = flags;
jaroslav@1646:         assert(testAnyFlags(ALL_KINDS));
jaroslav@1646:         assert(this.resolution == null);  // nobody should have touched this yet
jaroslav@1646:         //assert(referenceKindIsConsistent());  // do this after resolution
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Calls down to the VM to fill in the fields.  This method is
jaroslav@1646:      * synchronized to avoid racing calls.
jaroslav@1646:      */
jaroslav@1646:     private void expandFromVM() {
jaroslav@1646:         if (type != null) {
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         if (!isResolved()) {
jaroslav@1646:             return;
jaroslav@1646:         }
jaroslav@1646:         MethodHandleNatives.expand(this);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     // Capturing information from the Core Reflection API:
jaroslav@1646:     private static int flagsMods(int flags, int mods, byte refKind) {
jaroslav@1646:         assert((flags & RECOGNIZED_MODIFIERS) == 0);
jaroslav@1646:         assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
jaroslav@1646:         assert((refKind & ~MN_REFERENCE_KIND_MASK) == 0);
jaroslav@1646:         return flags | mods | (refKind << MN_REFERENCE_KIND_SHIFT);
jaroslav@1646:     }
jaroslav@1646:     /** Create a name for the given reflected method.  The resulting name will be in a resolved state. */
jaroslav@1646:     public MemberName(Method m) {
jaroslav@1646:         this(m, false);
jaroslav@1646:     }
jaroslav@1646:     @SuppressWarnings("LeakingThisInConstructor")
jaroslav@1646:     public MemberName(Method m, boolean wantSpecial) {
jaroslav@1646:         m.getClass();  // NPE check
jaroslav@1646:         // fill in vmtarget, vmindex while we have m in hand:
jaroslav@1646:         MethodHandleNatives.init(this, m);
jaroslav@1646:         if (clazz == null) {  // MHN.init failed
jaroslav@1646:             if (m.getDeclaringClass() == MethodHandle.class &&
jaroslav@1646:                 isMethodHandleInvokeName(m.getName())) {
jaroslav@1646:                 // The JVM did not reify this signature-polymorphic instance.
jaroslav@1646:                 // Need a special case here.
jaroslav@1646:                 // See comments on MethodHandleNatives.linkMethod.
jaroslav@1646:                 MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
jaroslav@1646:                 int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
jaroslav@1646:                 init(MethodHandle.class, m.getName(), type, flags);
jaroslav@1646:                 if (isMethodHandleInvoke())
jaroslav@1646:                     return;
jaroslav@1646:             }
jaroslav@1646:             throw new LinkageError(m.toString());
jaroslav@1646:         }
jaroslav@1646:         assert(isResolved() && this.clazz != null);
jaroslav@1646:         this.name = m.getName();
jaroslav@1646:         if (this.type == null)
jaroslav@1646:             this.type = new Object[] { m.getReturnType(), m.getParameterTypes() };
jaroslav@1646:         if (wantSpecial) {
jaroslav@1646:             if (isAbstract())
jaroslav@1646:                 throw new AbstractMethodError(this.toString());
jaroslav@1646:             if (getReferenceKind() == REF_invokeVirtual)
jaroslav@1646:                 changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
jaroslav@1646:             else if (getReferenceKind() == REF_invokeInterface)
jaroslav@1646:                 // invokeSpecial on a default method
jaroslav@1646:                 changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646:     public MemberName asSpecial() {
jaroslav@1646:         switch (getReferenceKind()) {
jaroslav@1646:         case REF_invokeSpecial:     return this;
jaroslav@1646:         case REF_invokeVirtual:     return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
jaroslav@1646:         case REF_invokeInterface:   return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
jaroslav@1646:         case REF_newInvokeSpecial:  return clone().changeReferenceKind(REF_invokeSpecial, REF_newInvokeSpecial);
jaroslav@1646:         }
jaroslav@1646:         throw new IllegalArgumentException(this.toString());
jaroslav@1646:     }
jaroslav@1646:     /** If this MN is not REF_newInvokeSpecial, return a clone with that ref. kind.
jaroslav@1646:      *  In that case it must already be REF_invokeSpecial.
jaroslav@1646:      */
jaroslav@1646:     public MemberName asConstructor() {
jaroslav@1646:         switch (getReferenceKind()) {
jaroslav@1646:         case REF_invokeSpecial:     return clone().changeReferenceKind(REF_newInvokeSpecial, REF_invokeSpecial);
jaroslav@1646:         case REF_newInvokeSpecial:  return this;
jaroslav@1646:         }
jaroslav@1646:         throw new IllegalArgumentException(this.toString());
jaroslav@1646:     }
jaroslav@1646:     /** If this MN is a REF_invokeSpecial, return a clone with the "normal" kind
jaroslav@1646:      *  REF_invokeVirtual; also switch either to REF_invokeInterface if clazz.isInterface.
jaroslav@1646:      *  The end result is to get a fully virtualized version of the MN.
jaroslav@1646:      *  (Note that resolving in the JVM will sometimes devirtualize, changing
jaroslav@1646:      *  REF_invokeVirtual of a final to REF_invokeSpecial, and REF_invokeInterface
jaroslav@1646:      *  in some corner cases to either of the previous two; this transform
jaroslav@1646:      *  undoes that change under the assumption that it occurred.)
jaroslav@1646:      */
jaroslav@1646:     public MemberName asNormalOriginal() {
jaroslav@1646:         byte normalVirtual = clazz.isInterface() ? REF_invokeInterface : REF_invokeVirtual;
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         byte newRefKind = refKind;
jaroslav@1646:         MemberName result = this;
jaroslav@1646:         switch (refKind) {
jaroslav@1646:         case REF_invokeInterface:
jaroslav@1646:         case REF_invokeVirtual:
jaroslav@1646:         case REF_invokeSpecial:
jaroslav@1646:             newRefKind = normalVirtual;
jaroslav@1646:             break;
jaroslav@1646:         }
jaroslav@1646:         if (newRefKind == refKind)
jaroslav@1646:             return this;
jaroslav@1646:         result = clone().changeReferenceKind(newRefKind, refKind);
jaroslav@1646:         assert(this.referenceKindIsConsistentWith(result.getReferenceKind()));
jaroslav@1646:         return result;
jaroslav@1646:     }
jaroslav@1646:     /** Create a name for the given reflected constructor.  The resulting name will be in a resolved state. */
jaroslav@1646:     @SuppressWarnings("LeakingThisInConstructor")
jaroslav@1646:     public MemberName(Constructor<?> ctor) {
jaroslav@1646:         ctor.getClass();  // NPE check
jaroslav@1646:         // fill in vmtarget, vmindex while we have ctor in hand:
jaroslav@1646:         MethodHandleNatives.init(this, ctor);
jaroslav@1646:         assert(isResolved() && this.clazz != null);
jaroslav@1646:         this.name = CONSTRUCTOR_NAME;
jaroslav@1646:         if (this.type == null)
jaroslav@1646:             this.type = new Object[] { void.class, ctor.getParameterTypes() };
jaroslav@1646:     }
jaroslav@1646:     /** Create a name for the given reflected field.  The resulting name will be in a resolved state.
jaroslav@1646:      */
jaroslav@1646:     public MemberName(Field fld) {
jaroslav@1646:         this(fld, false);
jaroslav@1646:     }
jaroslav@1646:     @SuppressWarnings("LeakingThisInConstructor")
jaroslav@1646:     public MemberName(Field fld, boolean makeSetter) {
jaroslav@1646:         fld.getClass();  // NPE check
jaroslav@1646:         // fill in vmtarget, vmindex while we have fld in hand:
jaroslav@1646:         MethodHandleNatives.init(this, fld);
jaroslav@1646:         assert(isResolved() && this.clazz != null);
jaroslav@1646:         this.name = fld.getName();
jaroslav@1646:         this.type = fld.getType();
jaroslav@1646:         assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
jaroslav@1646:         byte refKind = this.getReferenceKind();
jaroslav@1646:         assert(refKind == (isStatic() ? REF_getStatic : REF_getField));
jaroslav@1646:         if (makeSetter) {
jaroslav@1646:             changeReferenceKind((byte)(refKind + (REF_putStatic - REF_getStatic)), refKind);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646:     public boolean isGetter() {
jaroslav@1646:         return MethodHandleNatives.refKindIsGetter(getReferenceKind());
jaroslav@1646:     }
jaroslav@1646:     public boolean isSetter() {
jaroslav@1646:         return MethodHandleNatives.refKindIsSetter(getReferenceKind());
jaroslav@1646:     }
jaroslav@1646:     public MemberName asSetter() {
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         assert(MethodHandleNatives.refKindIsGetter(refKind));
jaroslav@1646:         assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
jaroslav@1646:         byte setterRefKind = (byte)(refKind + (REF_putField - REF_getField));
jaroslav@1646:         return clone().changeReferenceKind(setterRefKind, refKind);
jaroslav@1646:     }
jaroslav@1646:     /** Create a name for the given class.  The resulting name will be in a resolved state. */
jaroslav@1646:     public MemberName(Class<?> type) {
jaroslav@1646:         init(type.getDeclaringClass(), type.getSimpleName(), type,
jaroslav@1646:                 flagsMods(IS_TYPE, type.getModifiers(), REF_NONE));
jaroslav@1646:         initResolved(true);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /**
jaroslav@1646:      * Create a name for a signature-polymorphic invoker.
jaroslav@1646:      * This is a placeholder for a signature-polymorphic instance
jaroslav@1646:      * (of MH.invokeExact, etc.) that the JVM does not reify.
jaroslav@1646:      * See comments on {@link MethodHandleNatives#linkMethod}.
jaroslav@1646:      */
jaroslav@1646:     static MemberName makeMethodHandleInvoke(String name, MethodType type) {
jaroslav@1646:         return makeMethodHandleInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
jaroslav@1646:     }
jaroslav@1646:     static MemberName makeMethodHandleInvoke(String name, MethodType type, int mods) {
jaroslav@1646:         MemberName mem = new MemberName(MethodHandle.class, name, type, REF_invokeVirtual);
jaroslav@1646:         mem.flags |= mods;  // it's not resolved, but add these modifiers anyway
jaroslav@1646:         assert(mem.isMethodHandleInvoke()) : mem;
jaroslav@1646:         return mem;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     // bare-bones constructor; the JVM will fill it in
jaroslav@1646:     MemberName() { }
jaroslav@1646: 
jaroslav@1646:     // locally useful cloner
jaroslav@1646:     @Override protected MemberName clone() {
jaroslav@1646:         try {
jaroslav@1646:             return (MemberName) super.clone();
jaroslav@1646:         } catch (CloneNotSupportedException ex) {
jaroslav@1646:             throw newInternalError(ex);
jaroslav@1646:         }
jaroslav@1646:      }
jaroslav@1646: 
jaroslav@1646:     /** Get the definition of this member name.
jaroslav@1646:      *  This may be in a super-class of the declaring class of this member.
jaroslav@1646:      */
jaroslav@1646:     public MemberName getDefinition() {
jaroslav@1646:         if (!isResolved())  throw new IllegalStateException("must be resolved: "+this);
jaroslav@1646:         if (isType())  return this;
jaroslav@1646:         MemberName res = this.clone();
jaroslav@1646:         res.clazz = null;
jaroslav@1646:         res.type = null;
jaroslav@1646:         res.name = null;
jaroslav@1646:         res.resolution = res;
jaroslav@1646:         res.expandFromVM();
jaroslav@1646:         assert(res.getName().equals(this.getName()));
jaroslav@1646:         return res;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public int hashCode() {
jaroslav@1646:         return Objects.hash(clazz, getReferenceKind(), name, getType());
jaroslav@1646:     }
jaroslav@1646:     @Override
jaroslav@1646:     public boolean equals(Object that) {
jaroslav@1646:         return (that instanceof MemberName && this.equals((MemberName)that));
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Decide if two member names have exactly the same symbolic content.
jaroslav@1646:      *  Does not take into account any actual class members, so even if
jaroslav@1646:      *  two member names resolve to the same actual member, they may
jaroslav@1646:      *  be distinct references.
jaroslav@1646:      */
jaroslav@1646:     public boolean equals(MemberName that) {
jaroslav@1646:         if (this == that)  return true;
jaroslav@1646:         if (that == null)  return false;
jaroslav@1646:         return this.clazz == that.clazz
jaroslav@1646:                 && this.getReferenceKind() == that.getReferenceKind()
jaroslav@1646:                 && Objects.equals(this.name, that.name)
jaroslav@1646:                 && Objects.equals(this.getType(), that.getType());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     // Construction from symbolic parts, for queries:
jaroslav@1646:     /** Create a field or type name from the given components:
jaroslav@1646:      *  Declaring class, name, type, reference kind.
jaroslav@1646:      *  The declaring class may be supplied as null if this is to be a bare name and type.
jaroslav@1646:      *  The resulting name will in an unresolved state.
jaroslav@1646:      */
jaroslav@1646:     public MemberName(Class<?> defClass, String name, Class<?> type, byte refKind) {
jaroslav@1646:         init(defClass, name, type, flagsMods(IS_FIELD, 0, refKind));
jaroslav@1646:         initResolved(false);
jaroslav@1646:     }
jaroslav@1646:     /** Create a field or type name from the given components:  Declaring class, name, type.
jaroslav@1646:      *  The declaring class may be supplied as null if this is to be a bare name and type.
jaroslav@1646:      *  The modifier flags default to zero.
jaroslav@1646:      *  The resulting name will in an unresolved state.
jaroslav@1646:      */
jaroslav@1646:     public MemberName(Class<?> defClass, String name, Class<?> type, Void unused) {
jaroslav@1646:         this(defClass, name, type, REF_NONE);
jaroslav@1646:         initResolved(false);
jaroslav@1646:     }
jaroslav@1646:     /** Create a method or constructor name from the given components:  Declaring class, name, type, modifiers.
jaroslav@1646:      *  It will be a constructor if and only if the name is {@code "&lt;init&gt;"}.
jaroslav@1646:      *  The declaring class may be supplied as null if this is to be a bare name and type.
jaroslav@1646:      *  The last argument is optional, a boolean which requests REF_invokeSpecial.
jaroslav@1646:      *  The resulting name will in an unresolved state.
jaroslav@1646:      */
jaroslav@1646:     public MemberName(Class<?> defClass, String name, MethodType type, byte refKind) {
jaroslav@1646:         int initFlags = (name != null && name.equals(CONSTRUCTOR_NAME) ? IS_CONSTRUCTOR : IS_METHOD);
jaroslav@1646:         init(defClass, name, type, flagsMods(initFlags, 0, refKind));
jaroslav@1646:         initResolved(false);
jaroslav@1646:     }
jaroslav@1646:     /** Create a method, constructor, or field name from the given components:
jaroslav@1646:      *  Reference kind, declaring class, name, type.
jaroslav@1646:      */
jaroslav@1646:     public MemberName(byte refKind, Class<?> defClass, String name, Object type) {
jaroslav@1646:         int kindFlags;
jaroslav@1646:         if (MethodHandleNatives.refKindIsField(refKind)) {
jaroslav@1646:             kindFlags = IS_FIELD;
jaroslav@1646:             if (!(type instanceof Class))
jaroslav@1646:                 throw newIllegalArgumentException("not a field type");
jaroslav@1646:         } else if (MethodHandleNatives.refKindIsMethod(refKind)) {
jaroslav@1646:             kindFlags = IS_METHOD;
jaroslav@1646:             if (!(type instanceof MethodType))
jaroslav@1646:                 throw newIllegalArgumentException("not a method type");
jaroslav@1646:         } else if (refKind == REF_newInvokeSpecial) {
jaroslav@1646:             kindFlags = IS_CONSTRUCTOR;
jaroslav@1646:             if (!(type instanceof MethodType) ||
jaroslav@1646:                 !CONSTRUCTOR_NAME.equals(name))
jaroslav@1646:                 throw newIllegalArgumentException("not a constructor type or name");
jaroslav@1646:         } else {
jaroslav@1646:             throw newIllegalArgumentException("bad reference kind "+refKind);
jaroslav@1646:         }
jaroslav@1646:         init(defClass, name, type, flagsMods(kindFlags, 0, refKind));
jaroslav@1646:         initResolved(false);
jaroslav@1646:     }
jaroslav@1646:     /** Query whether this member name is resolved to a non-static, non-final method.
jaroslav@1646:      */
jaroslav@1646:     public boolean hasReceiverTypeDispatch() {
jaroslav@1646:         return MethodHandleNatives.refKindDoesDispatch(getReferenceKind());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Query whether this member name is resolved.
jaroslav@1646:      *  A resolved member name is one for which the JVM has found
jaroslav@1646:      *  a method, constructor, field, or type binding corresponding exactly to the name.
jaroslav@1646:      *  (Document?)
jaroslav@1646:      */
jaroslav@1646:     public boolean isResolved() {
jaroslav@1646:         return resolution == null;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private void initResolved(boolean isResolved) {
jaroslav@1646:         assert(this.resolution == null);  // not initialized yet!
jaroslav@1646:         if (!isResolved)
jaroslav@1646:             this.resolution = this;
jaroslav@1646:         assert(isResolved() == isResolved);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     void checkForTypeAlias() {
jaroslav@1646:         if (isInvocable()) {
jaroslav@1646:             MethodType type;
jaroslav@1646:             if (this.type instanceof MethodType)
jaroslav@1646:                 type = (MethodType) this.type;
jaroslav@1646:             else
jaroslav@1646:                 this.type = type = getMethodType();
jaroslav@1646:             if (type.erase() == type)  return;
jaroslav@1646:             if (VerifyAccess.isTypeVisible(type, clazz))  return;
jaroslav@1646:             throw new LinkageError("bad method type alias: "+type+" not visible from "+clazz);
jaroslav@1646:         } else {
jaroslav@1646:             Class<?> type;
jaroslav@1646:             if (this.type instanceof Class<?>)
jaroslav@1646:                 type = (Class<?>) this.type;
jaroslav@1646:             else
jaroslav@1646:                 this.type = type = getFieldType();
jaroslav@1646:             if (VerifyAccess.isTypeVisible(type, clazz))  return;
jaroslav@1646:             throw new LinkageError("bad field type alias: "+type+" not visible from "+clazz);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646: 
jaroslav@1646:     /** Produce a string form of this member name.
jaroslav@1646:      *  For types, it is simply the type's own string (as reported by {@code toString}).
jaroslav@1646:      *  For fields, it is {@code "DeclaringClass.name/type"}.
jaroslav@1646:      *  For methods and constructors, it is {@code "DeclaringClass.name(ptype...)rtype"}.
jaroslav@1646:      *  If the declaring class is null, the prefix {@code "DeclaringClass."} is omitted.
jaroslav@1646:      *  If the member is unresolved, a prefix {@code "*."} is prepended.
jaroslav@1646:      */
jaroslav@1646:     @SuppressWarnings("LocalVariableHidesMemberVariable")
jaroslav@1646:     @Override
jaroslav@1646:     public String toString() {
jaroslav@1646:         if (isType())
jaroslav@1646:             return type.toString();  // class java.lang.String
jaroslav@1646:         // else it is a field, method, or constructor
jaroslav@1646:         StringBuilder buf = new StringBuilder();
jaroslav@1646:         if (getDeclaringClass() != null) {
jaroslav@1646:             buf.append(getName(clazz));
jaroslav@1646:             buf.append('.');
jaroslav@1646:         }
jaroslav@1646:         String name = getName();
jaroslav@1646:         buf.append(name == null ? "*" : name);
jaroslav@1646:         Object type = getType();
jaroslav@1646:         if (!isInvocable()) {
jaroslav@1646:             buf.append('/');
jaroslav@1646:             buf.append(type == null ? "*" : getName(type));
jaroslav@1646:         } else {
jaroslav@1646:             buf.append(type == null ? "(*)*" : getName(type));
jaroslav@1646:         }
jaroslav@1646:         byte refKind = getReferenceKind();
jaroslav@1646:         if (refKind != REF_NONE) {
jaroslav@1646:             buf.append('/');
jaroslav@1646:             buf.append(MethodHandleNatives.refKindName(refKind));
jaroslav@1646:         }
jaroslav@1646:         //buf.append("#").append(System.identityHashCode(this));
jaroslav@1646:         return buf.toString();
jaroslav@1646:     }
jaroslav@1646:     private static String getName(Object obj) {
jaroslav@1646:         if (obj instanceof Class<?>)
jaroslav@1646:             return ((Class<?>)obj).getName();
jaroslav@1646:         return String.valueOf(obj);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     public IllegalAccessException makeAccessException(String message, Object from) {
jaroslav@1646:         message = message + ": "+ toString();
jaroslav@1646:         if (from != null)  message += ", from " + from;
jaroslav@1646:         return new IllegalAccessException(message);
jaroslav@1646:     }
jaroslav@1646:     private String message() {
jaroslav@1646:         if (isResolved())
jaroslav@1646:             return "no access";
jaroslav@1646:         else if (isConstructor())
jaroslav@1646:             return "no such constructor";
jaroslav@1646:         else if (isMethod())
jaroslav@1646:             return "no such method";
jaroslav@1646:         else
jaroslav@1646:             return "no such field";
jaroslav@1646:     }
jaroslav@1646:     public ReflectiveOperationException makeAccessException() {
jaroslav@1646:         String message = message() + ": "+ toString();
jaroslav@1646:         ReflectiveOperationException ex;
jaroslav@1646:         if (isResolved() || !(resolution instanceof NoSuchMethodError ||
jaroslav@1646:                               resolution instanceof NoSuchFieldError))
jaroslav@1646:             ex = new IllegalAccessException(message);
jaroslav@1646:         else if (isConstructor())
jaroslav@1646:             ex = new NoSuchMethodException(message);
jaroslav@1646:         else if (isMethod())
jaroslav@1646:             ex = new NoSuchMethodException(message);
jaroslav@1646:         else
jaroslav@1646:             ex = new NoSuchFieldException(message);
jaroslav@1646:         if (resolution instanceof Throwable)
jaroslav@1646:             ex.initCause((Throwable) resolution);
jaroslav@1646:         return ex;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     /** Actually making a query requires an access check. */
jaroslav@1646:     /*non-public*/ static Factory getFactory() {
jaroslav@1646:         return Factory.INSTANCE;
jaroslav@1646:     }
jaroslav@1646:     /** A factory type for resolving member names with the help of the VM.
jaroslav@1646:      *  TBD: Define access-safe public constructors for this factory.
jaroslav@1646:      */
jaroslav@1646:     /*non-public*/ static class Factory {
jaroslav@1646:         private Factory() { } // singleton pattern
jaroslav@1646:         static Factory INSTANCE = new Factory();
jaroslav@1646: 
jaroslav@1646:         private static int ALLOWED_FLAGS = ALL_KINDS;
jaroslav@1646: 
jaroslav@1646:         /// Queries
jaroslav@1646:         List<MemberName> getMembers(Class<?> defc,
jaroslav@1646:                 String matchName, Object matchType,
jaroslav@1646:                 int matchFlags, Class<?> lookupClass) {
jaroslav@1646:             matchFlags &= ALLOWED_FLAGS;
jaroslav@1646:             String matchSig = null;
jaroslav@1646:             if (matchType != null) {
jaroslav@1646:                 matchSig = BytecodeDescriptor.unparse(matchType);
jaroslav@1646:                 if (matchSig.startsWith("("))
jaroslav@1646:                     matchFlags &= ~(ALL_KINDS & ~IS_INVOCABLE);
jaroslav@1646:                 else
jaroslav@1646:                     matchFlags &= ~(ALL_KINDS & ~IS_FIELD);
jaroslav@1646:             }
jaroslav@1646:             final int BUF_MAX = 0x2000;
jaroslav@1646:             int len1 = matchName == null ? 10 : matchType == null ? 4 : 1;
jaroslav@1646:             MemberName[] buf = newMemberBuffer(len1);
jaroslav@1646:             int totalCount = 0;
jaroslav@1646:             ArrayList<MemberName[]> bufs = null;
jaroslav@1646:             int bufCount = 0;
jaroslav@1646:             for (;;) {
jaroslav@1646:                 bufCount = MethodHandleNatives.getMembers(defc,
jaroslav@1646:                         matchName, matchSig, matchFlags,
jaroslav@1646:                         lookupClass,
jaroslav@1646:                         totalCount, buf);
jaroslav@1646:                 if (bufCount <= buf.length) {
jaroslav@1646:                     if (bufCount < 0)  bufCount = 0;
jaroslav@1646:                     totalCount += bufCount;
jaroslav@1646:                     break;
jaroslav@1646:                 }
jaroslav@1646:                 // JVM returned to us with an intentional overflow!
jaroslav@1646:                 totalCount += buf.length;
jaroslav@1646:                 int excess = bufCount - buf.length;
jaroslav@1646:                 if (bufs == null)  bufs = new ArrayList<>(1);
jaroslav@1646:                 bufs.add(buf);
jaroslav@1646:                 int len2 = buf.length;
jaroslav@1646:                 len2 = Math.max(len2, excess);
jaroslav@1646:                 len2 = Math.max(len2, totalCount / 4);
jaroslav@1646:                 buf = newMemberBuffer(Math.min(BUF_MAX, len2));
jaroslav@1646:             }
jaroslav@1646:             ArrayList<MemberName> result = new ArrayList<>(totalCount);
jaroslav@1646:             if (bufs != null) {
jaroslav@1646:                 for (MemberName[] buf0 : bufs) {
jaroslav@1646:                     Collections.addAll(result, buf0);
jaroslav@1646:                 }
jaroslav@1646:             }
jaroslav@1646:             result.addAll(Arrays.asList(buf).subList(0, bufCount));
jaroslav@1646:             // Signature matching is not the same as type matching, since
jaroslav@1646:             // one signature might correspond to several types.
jaroslav@1646:             // So if matchType is a Class or MethodType, refilter the results.
jaroslav@1646:             if (matchType != null && matchType != matchSig) {
jaroslav@1646:                 for (Iterator<MemberName> it = result.iterator(); it.hasNext();) {
jaroslav@1646:                     MemberName m = it.next();
jaroslav@1646:                     if (!matchType.equals(m.getType()))
jaroslav@1646:                         it.remove();
jaroslav@1646:                 }
jaroslav@1646:             }
jaroslav@1646:             return result;
jaroslav@1646:         }
jaroslav@1646:         /** Produce a resolved version of the given member.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  If lookup fails or access is not permitted, null is returned.
jaroslav@1646:          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
jaroslav@1646:          */
jaroslav@1646:         private MemberName resolve(byte refKind, MemberName ref, Class<?> lookupClass) {
jaroslav@1646:             MemberName m = ref.clone();  // JVM will side-effect the ref
jaroslav@1646:             assert(refKind == m.getReferenceKind());
jaroslav@1646:             try {
jaroslav@1646:                 m = MethodHandleNatives.resolve(m, lookupClass);
jaroslav@1646:                 m.checkForTypeAlias();
jaroslav@1646:                 m.resolution = null;
jaroslav@1646:             } catch (LinkageError ex) {
jaroslav@1646:                 // JVM reports that the "bytecode behavior" would get an error
jaroslav@1646:                 assert(!m.isResolved());
jaroslav@1646:                 m.resolution = ex;
jaroslav@1646:                 return m;
jaroslav@1646:             }
jaroslav@1646:             assert(m.referenceKindIsConsistent());
jaroslav@1646:             m.initResolved(true);
jaroslav@1646:             assert(m.vminfoIsConsistent());
jaroslav@1646:             return m;
jaroslav@1646:         }
jaroslav@1646:         /** Produce a resolved version of the given member.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  If lookup fails or access is not permitted, a {@linkplain ReflectiveOperationException} is thrown.
jaroslav@1646:          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
jaroslav@1646:          */
jaroslav@1646:         public
jaroslav@1646:         <NoSuchMemberException extends ReflectiveOperationException>
jaroslav@1646:         MemberName resolveOrFail(byte refKind, MemberName m, Class<?> lookupClass,
jaroslav@1646:                                  Class<NoSuchMemberException> nsmClass)
jaroslav@1646:                 throws IllegalAccessException, NoSuchMemberException {
jaroslav@1646:             MemberName result = resolve(refKind, m, lookupClass);
jaroslav@1646:             if (result.isResolved())
jaroslav@1646:                 return result;
jaroslav@1646:             ReflectiveOperationException ex = result.makeAccessException();
jaroslav@1646:             if (ex instanceof IllegalAccessException)  throw (IllegalAccessException) ex;
jaroslav@1646:             throw nsmClass.cast(ex);
jaroslav@1646:         }
jaroslav@1646:         /** Produce a resolved version of the given member.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  If lookup fails or access is not permitted, return null.
jaroslav@1646:          *  Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
jaroslav@1646:          */
jaroslav@1646:         public
jaroslav@1646:         MemberName resolveOrNull(byte refKind, MemberName m, Class<?> lookupClass) {
jaroslav@1646:             MemberName result = resolve(refKind, m, lookupClass);
jaroslav@1646:             if (result.isResolved())
jaroslav@1646:                 return result;
jaroslav@1646:             return null;
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of all methods defined by the given class.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
jaroslav@1646:                 Class<?> lookupClass) {
jaroslav@1646:             return getMethods(defc, searchSupers, null, null, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of matching methods defined by the given class.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Returned methods will match the name (if not null) and the type (if not null).
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
jaroslav@1646:                 String name, MethodType type, Class<?> lookupClass) {
jaroslav@1646:             int matchFlags = IS_METHOD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
jaroslav@1646:             return getMembers(defc, name, type, matchFlags, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of all constructors defined by the given class.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getConstructors(Class<?> defc, Class<?> lookupClass) {
jaroslav@1646:             return getMembers(defc, null, null, IS_CONSTRUCTOR, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of all fields defined by the given class.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
jaroslav@1646:                 Class<?> lookupClass) {
jaroslav@1646:             return getFields(defc, searchSupers, null, null, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of all fields defined by the given class.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Returned fields will match the name (if not null) and the type (if not null).
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
jaroslav@1646:                 String name, Class<?> type, Class<?> lookupClass) {
jaroslav@1646:             int matchFlags = IS_FIELD | (searchSupers ? SEARCH_ALL_SUPERS : 0);
jaroslav@1646:             return getMembers(defc, name, type, matchFlags, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         /** Return a list of all nested types defined by the given class.
jaroslav@1646:          *  Super types are searched (for inherited members) if {@code searchSupers} is true.
jaroslav@1646:          *  Access checking is performed on behalf of the given {@code lookupClass}.
jaroslav@1646:          *  Inaccessible members are not added to the last.
jaroslav@1646:          */
jaroslav@1646:         public List<MemberName> getNestedTypes(Class<?> defc, boolean searchSupers,
jaroslav@1646:                 Class<?> lookupClass) {
jaroslav@1646:             int matchFlags = IS_TYPE | (searchSupers ? SEARCH_ALL_SUPERS : 0);
jaroslav@1646:             return getMembers(defc, null, null, matchFlags, lookupClass);
jaroslav@1646:         }
jaroslav@1646:         private static MemberName[] newMemberBuffer(int length) {
jaroslav@1646:             MemberName[] buf = new MemberName[length];
jaroslav@1646:             // fill the buffer with dummy structs for the JVM to fill in
jaroslav@1646:             for (int i = 0; i < length; i++)
jaroslav@1646:                 buf[i] = new MemberName();
jaroslav@1646:             return buf;
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646: //    static {
jaroslav@1646: //        System.out.println("Hello world!  My methods are:");
jaroslav@1646: //        System.out.println(Factory.INSTANCE.getMethods(MemberName.class, true, null));
jaroslav@1646: //    }
jaroslav@1646: }