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1091 lines
46 KiB
1091 lines
46 KiB
/*
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.lang.invoke;
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import sun.invoke.util.BytecodeDescriptor;
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import sun.invoke.util.VerifyAccess;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.lang.reflect.Member;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandleStatics.*;
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import java.util.Objects;
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/**
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* A {@code MemberName} is a compact symbolic datum which fully characterizes
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* a method or field reference.
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* A member name refers to a field, method, constructor, or member type.
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* Every member name has a simple name (a string) and a type (either a Class or MethodType).
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* A member name may also have a non-null declaring class, or it may be simply
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* a naked name/type pair.
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* A member name may also have non-zero modifier flags.
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* Finally, a member name may be either resolved or unresolved.
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* If it is resolved, the existence of the named
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* <p>
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* Whether resolved or not, a member name provides no access rights or
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* invocation capability to its possessor. It is merely a compact
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* representation of all symbolic information necessary to link to
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* and properly use the named member.
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* <p>
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* When resolved, a member name's internal implementation may include references to JVM metadata.
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* This representation is stateless and only decriptive.
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* It provides no private information and no capability to use the member.
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* <p>
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* By contrast, a {@linkplain java.lang.reflect.Method} contains fuller information
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* about the internals of a method (except its bytecodes) and also
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* allows invocation. A MemberName is much lighter than a Method,
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* since it contains about 7 fields to the 16 of Method (plus its sub-arrays),
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* and those seven fields omit much of the information in Method.
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* @author jrose
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*/
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/*non-public*/ final class MemberName implements Member, Cloneable {
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private Class<?> clazz; // class in which the method is defined
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private String name; // may be null if not yet materialized
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private Object type; // may be null if not yet materialized
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private int flags; // modifier bits; see reflect.Modifier
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//@Injected JVM_Method* vmtarget;
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//@Injected int vmindex;
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private Object resolution; // if null, this guy is resolved
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/** Return the declaring class of this member.
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* In the case of a bare name and type, the declaring class will be null.
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*/
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public Class<?> getDeclaringClass() {
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return clazz;
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}
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/** Utility method producing the class loader of the declaring class. */
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public ClassLoader getClassLoader() {
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return clazz.getClassLoader();
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}
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/** Return the simple name of this member.
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* For a type, it is the same as {@link Class#getSimpleName}.
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* For a method or field, it is the simple name of the member.
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* For a constructor, it is always {@code "<init>"}.
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*/
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public String getName() {
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if (name == null) {
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expandFromVM();
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if (name == null) {
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return null;
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}
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}
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return name;
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}
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public MethodType getMethodOrFieldType() {
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if (isInvocable())
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return getMethodType();
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if (isGetter())
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return MethodType.methodType(getFieldType());
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if (isSetter())
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return MethodType.methodType(void.class, getFieldType());
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throw new InternalError("not a method or field: "+this);
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}
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/** Return the declared type of this member, which
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* must be a method or constructor.
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*/
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public MethodType getMethodType() {
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if (type == null) {
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expandFromVM();
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if (type == null) {
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return null;
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}
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}
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if (!isInvocable()) {
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throw newIllegalArgumentException("not invocable, no method type");
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}
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{
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// Get a snapshot of type which doesn't get changed by racing threads.
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final Object type = this.type;
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if (type instanceof MethodType) {
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return (MethodType) type;
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}
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}
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// type is not a MethodType yet. Convert it thread-safely.
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synchronized (this) {
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if (type instanceof String) {
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String sig = (String) type;
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MethodType res = MethodType.fromMethodDescriptorString(sig, getClassLoader());
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type = res;
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} else if (type instanceof Object[]) {
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Object[] typeInfo = (Object[]) type;
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Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
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Class<?> rtype = (Class<?>) typeInfo[0];
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MethodType res = MethodType.methodType(rtype, ptypes);
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type = res;
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}
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// Make sure type is a MethodType for racing threads.
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assert type instanceof MethodType : "bad method type " + type;
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}
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return (MethodType) type;
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}
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/** Return the actual type under which this method or constructor must be invoked.
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* For non-static methods or constructors, this is the type with a leading parameter,
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* a reference to declaring class. For static methods, it is the same as the declared type.
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*/
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public MethodType getInvocationType() {
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MethodType itype = getMethodOrFieldType();
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if (isConstructor() && getReferenceKind() == REF_newInvokeSpecial)
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return itype.changeReturnType(clazz);
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if (!isStatic())
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return itype.insertParameterTypes(0, clazz);
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return itype;
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}
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/** Utility method producing the parameter types of the method type. */
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public Class<?>[] getParameterTypes() {
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return getMethodType().parameterArray();
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}
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/** Utility method producing the return type of the method type. */
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public Class<?> getReturnType() {
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return getMethodType().returnType();
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}
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/** Return the declared type of this member, which
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* must be a field or type.
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* If it is a type member, that type itself is returned.
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*/
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public Class<?> getFieldType() {
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if (type == null) {
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expandFromVM();
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if (type == null) {
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return null;
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}
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}
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if (isInvocable()) {
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throw newIllegalArgumentException("not a field or nested class, no simple type");
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}
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{
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// Get a snapshot of type which doesn't get changed by racing threads.
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final Object type = this.type;
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if (type instanceof Class<?>) {
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return (Class<?>) type;
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}
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}
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// type is not a Class yet. Convert it thread-safely.
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synchronized (this) {
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if (type instanceof String) {
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String sig = (String) type;
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MethodType mtype = MethodType.fromMethodDescriptorString("()"+sig, getClassLoader());
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Class<?> res = mtype.returnType();
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type = res;
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}
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// Make sure type is a Class for racing threads.
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assert type instanceof Class<?> : "bad field type " + type;
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}
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return (Class<?>) type;
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}
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/** Utility method to produce either the method type or field type of this member. */
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public Object getType() {
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return (isInvocable() ? getMethodType() : getFieldType());
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}
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/** Utility method to produce the signature of this member,
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* used within the class file format to describe its type.
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*/
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public String getSignature() {
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if (type == null) {
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expandFromVM();
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if (type == null) {
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return null;
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}
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}
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if (isInvocable())
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return BytecodeDescriptor.unparse(getMethodType());
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else
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return BytecodeDescriptor.unparse(getFieldType());
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}
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/** Return the modifier flags of this member.
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* @see java.lang.reflect.Modifier
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*/
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public int getModifiers() {
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return (flags & RECOGNIZED_MODIFIERS);
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}
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/** Return the reference kind of this member, or zero if none.
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*/
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public byte getReferenceKind() {
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return (byte) ((flags >>> MN_REFERENCE_KIND_SHIFT) & MN_REFERENCE_KIND_MASK);
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}
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private boolean referenceKindIsConsistent() {
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byte refKind = getReferenceKind();
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if (refKind == REF_NONE) return isType();
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if (isField()) {
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assert(staticIsConsistent());
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assert(MethodHandleNatives.refKindIsField(refKind));
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} else if (isConstructor()) {
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assert(refKind == REF_newInvokeSpecial || refKind == REF_invokeSpecial);
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} else if (isMethod()) {
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assert(staticIsConsistent());
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assert(MethodHandleNatives.refKindIsMethod(refKind));
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if (clazz.isInterface())
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assert(refKind == REF_invokeInterface ||
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refKind == REF_invokeStatic ||
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refKind == REF_invokeSpecial ||
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refKind == REF_invokeVirtual && isObjectPublicMethod());
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} else {
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assert(false);
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}
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return true;
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}
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private boolean isObjectPublicMethod() {
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if (clazz == Object.class) return true;
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MethodType mtype = getMethodType();
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if (name.equals("toString") && mtype.returnType() == String.class && mtype.parameterCount() == 0)
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return true;
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if (name.equals("hashCode") && mtype.returnType() == int.class && mtype.parameterCount() == 0)
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return true;
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if (name.equals("equals") && mtype.returnType() == boolean.class && mtype.parameterCount() == 1 && mtype.parameterType(0) == Object.class)
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return true;
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return false;
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}
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/*non-public*/ boolean referenceKindIsConsistentWith(int originalRefKind) {
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int refKind = getReferenceKind();
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if (refKind == originalRefKind) return true;
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switch (originalRefKind) {
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case REF_invokeInterface:
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// Looking up an interface method, can get (e.g.) Object.hashCode
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assert(refKind == REF_invokeVirtual ||
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refKind == REF_invokeSpecial) : this;
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return true;
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case REF_invokeVirtual:
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case REF_newInvokeSpecial:
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// Looked up a virtual, can get (e.g.) final String.hashCode.
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assert(refKind == REF_invokeSpecial) : this;
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return true;
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}
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assert(false) : this+" != "+MethodHandleNatives.refKindName((byte)originalRefKind);
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return true;
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}
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private boolean staticIsConsistent() {
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byte refKind = getReferenceKind();
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return MethodHandleNatives.refKindIsStatic(refKind) == isStatic() || getModifiers() == 0;
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}
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private boolean vminfoIsConsistent() {
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byte refKind = getReferenceKind();
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assert(isResolved()); // else don't call
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Object vminfo = MethodHandleNatives.getMemberVMInfo(this);
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assert(vminfo instanceof Object[]);
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long vmindex = (Long) ((Object[])vminfo)[0];
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Object vmtarget = ((Object[])vminfo)[1];
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if (MethodHandleNatives.refKindIsField(refKind)) {
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assert(vmindex >= 0) : vmindex + ":" + this;
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assert(vmtarget instanceof Class);
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} else {
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if (MethodHandleNatives.refKindDoesDispatch(refKind))
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assert(vmindex >= 0) : vmindex + ":" + this;
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else
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assert(vmindex < 0) : vmindex;
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assert(vmtarget instanceof MemberName) : vmtarget + " in " + this;
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}
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return true;
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}
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private MemberName changeReferenceKind(byte refKind, byte oldKind) {
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assert(getReferenceKind() == oldKind);
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assert(MethodHandleNatives.refKindIsValid(refKind));
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flags += (((int)refKind - oldKind) << MN_REFERENCE_KIND_SHIFT);
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return this;
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}
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private boolean testFlags(int mask, int value) {
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return (flags & mask) == value;
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}
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private boolean testAllFlags(int mask) {
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return testFlags(mask, mask);
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}
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private boolean testAnyFlags(int mask) {
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return !testFlags(mask, 0);
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}
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/** Utility method to query if this member is a method handle invocation (invoke or invokeExact).
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*/
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public boolean isMethodHandleInvoke() {
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final int bits = MH_INVOKE_MODS &~ Modifier.PUBLIC;
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final int negs = Modifier.STATIC;
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if (testFlags(bits | negs, bits) &&
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clazz == MethodHandle.class) {
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return isMethodHandleInvokeName(name);
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}
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return false;
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}
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public static boolean isMethodHandleInvokeName(String name) {
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switch (name) {
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case "invoke":
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case "invokeExact":
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return true;
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default:
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return false;
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}
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}
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private static final int MH_INVOKE_MODS = Modifier.NATIVE | Modifier.FINAL | Modifier.PUBLIC;
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/** Utility method to query the modifier flags of this member. */
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public boolean isStatic() {
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return Modifier.isStatic(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isPublic() {
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return Modifier.isPublic(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isPrivate() {
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return Modifier.isPrivate(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isProtected() {
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return Modifier.isProtected(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isFinal() {
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return Modifier.isFinal(flags);
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}
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/** Utility method to query whether this member or its defining class is final. */
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public boolean canBeStaticallyBound() {
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return Modifier.isFinal(flags | clazz.getModifiers());
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isVolatile() {
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return Modifier.isVolatile(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isAbstract() {
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return Modifier.isAbstract(flags);
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}
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/** Utility method to query the modifier flags of this member. */
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public boolean isNative() {
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return Modifier.isNative(flags);
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}
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// let the rest (native, volatile, transient, etc.) be tested via Modifier.isFoo
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// unofficial modifier flags, used by HotSpot:
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static final int BRIDGE = 0x00000040;
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static final int VARARGS = 0x00000080;
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static final int SYNTHETIC = 0x00001000;
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static final int ANNOTATION= 0x00002000;
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static final int ENUM = 0x00004000;
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/** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
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public boolean isBridge() {
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return testAllFlags(IS_METHOD | BRIDGE);
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}
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/** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
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public boolean isVarargs() {
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return testAllFlags(VARARGS) && isInvocable();
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}
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/** Utility method to query the modifier flags of this member; returns false if the member is not a method. */
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public boolean isSynthetic() {
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return testAllFlags(SYNTHETIC);
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}
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static final String CONSTRUCTOR_NAME = "<init>"; // the ever-popular
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// modifiers exported by the JVM:
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static final int RECOGNIZED_MODIFIERS = 0xFFFF;
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// private flags, not part of RECOGNIZED_MODIFIERS:
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static final int
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IS_METHOD = MN_IS_METHOD, // method (not constructor)
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IS_CONSTRUCTOR = MN_IS_CONSTRUCTOR, // constructor
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IS_FIELD = MN_IS_FIELD, // field
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IS_TYPE = MN_IS_TYPE, // nested type
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CALLER_SENSITIVE = MN_CALLER_SENSITIVE; // @CallerSensitive annotation detected
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static final int ALL_ACCESS = Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED;
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static final int ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE;
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static final int IS_INVOCABLE = IS_METHOD | IS_CONSTRUCTOR;
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static final int IS_FIELD_OR_METHOD = IS_METHOD | IS_FIELD;
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static final int SEARCH_ALL_SUPERS = MN_SEARCH_SUPERCLASSES | MN_SEARCH_INTERFACES;
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/** Utility method to query whether this member is a method or constructor. */
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public boolean isInvocable() {
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return testAnyFlags(IS_INVOCABLE);
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}
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/** Utility method to query whether this member is a method, constructor, or field. */
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public boolean isFieldOrMethod() {
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return testAnyFlags(IS_FIELD_OR_METHOD);
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}
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/** Query whether this member is a method. */
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public boolean isMethod() {
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return testAllFlags(IS_METHOD);
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}
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/** Query whether this member is a constructor. */
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public boolean isConstructor() {
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return testAllFlags(IS_CONSTRUCTOR);
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}
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/** Query whether this member is a field. */
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public boolean isField() {
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return testAllFlags(IS_FIELD);
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}
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/** Query whether this member is a type. */
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public boolean isType() {
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return testAllFlags(IS_TYPE);
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}
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/** Utility method to query whether this member is neither public, private, nor protected. */
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public boolean isPackage() {
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return !testAnyFlags(ALL_ACCESS);
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}
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/** Query whether this member has a CallerSensitive annotation. */
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public boolean isCallerSensitive() {
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return testAllFlags(CALLER_SENSITIVE);
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}
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|
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/** Utility method to query whether this member is accessible from a given lookup class. */
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public boolean isAccessibleFrom(Class<?> lookupClass) {
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return VerifyAccess.isMemberAccessible(this.getDeclaringClass(), this.getDeclaringClass(), flags,
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lookupClass, ALL_ACCESS|MethodHandles.Lookup.PACKAGE);
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}
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/** Initialize a query. It is not resolved. */
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private void init(Class<?> defClass, String name, Object type, int flags) {
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// defining class is allowed to be null (for a naked name/type pair)
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//name.toString(); // null check
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//type.equals(type); // null check
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// fill in fields:
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this.clazz = defClass;
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this.name = name;
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this.type = type;
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this.flags = flags;
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assert(testAnyFlags(ALL_KINDS));
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assert(this.resolution == null); // nobody should have touched this yet
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//assert(referenceKindIsConsistent()); // do this after resolution
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}
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|
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/**
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|
* Calls down to the VM to fill in the fields. This method is
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|
* synchronized to avoid racing calls.
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|
*/
|
|
private void expandFromVM() {
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|
if (type != null) {
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return;
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|
}
|
|
if (!isResolved()) {
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return;
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}
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MethodHandleNatives.expand(this);
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|
}
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|
|
|
// Capturing information from the Core Reflection API:
|
|
private static int flagsMods(int flags, int mods, byte refKind) {
|
|
assert((flags & RECOGNIZED_MODIFIERS) == 0);
|
|
assert((mods & ~RECOGNIZED_MODIFIERS) == 0);
|
|
assert((refKind & ~MN_REFERENCE_KIND_MASK) == 0);
|
|
return flags | mods | (refKind << MN_REFERENCE_KIND_SHIFT);
|
|
}
|
|
/** Create a name for the given reflected method. The resulting name will be in a resolved state. */
|
|
public MemberName(Method m) {
|
|
this(m, false);
|
|
}
|
|
@SuppressWarnings("LeakingThisInConstructor")
|
|
public MemberName(Method m, boolean wantSpecial) {
|
|
m.getClass(); // NPE check
|
|
// fill in vmtarget, vmindex while we have m in hand:
|
|
MethodHandleNatives.init(this, m);
|
|
if (clazz == null) { // MHN.init failed
|
|
if (m.getDeclaringClass() == MethodHandle.class &&
|
|
isMethodHandleInvokeName(m.getName())) {
|
|
// The JVM did not reify this signature-polymorphic instance.
|
|
// Need a special case here.
|
|
// See comments on MethodHandleNatives.linkMethod.
|
|
MethodType type = MethodType.methodType(m.getReturnType(), m.getParameterTypes());
|
|
int flags = flagsMods(IS_METHOD, m.getModifiers(), REF_invokeVirtual);
|
|
init(MethodHandle.class, m.getName(), type, flags);
|
|
if (isMethodHandleInvoke())
|
|
return;
|
|
}
|
|
throw new LinkageError(m.toString());
|
|
}
|
|
assert(isResolved() && this.clazz != null);
|
|
this.name = m.getName();
|
|
if (this.type == null)
|
|
this.type = new Object[] { m.getReturnType(), m.getParameterTypes() };
|
|
if (wantSpecial) {
|
|
if (isAbstract())
|
|
throw new AbstractMethodError(this.toString());
|
|
if (getReferenceKind() == REF_invokeVirtual)
|
|
changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
|
|
else if (getReferenceKind() == REF_invokeInterface)
|
|
// invokeSpecial on a default method
|
|
changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
|
|
}
|
|
}
|
|
public MemberName asSpecial() {
|
|
switch (getReferenceKind()) {
|
|
case REF_invokeSpecial: return this;
|
|
case REF_invokeVirtual: return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeVirtual);
|
|
case REF_invokeInterface: return clone().changeReferenceKind(REF_invokeSpecial, REF_invokeInterface);
|
|
case REF_newInvokeSpecial: return clone().changeReferenceKind(REF_invokeSpecial, REF_newInvokeSpecial);
|
|
}
|
|
throw new IllegalArgumentException(this.toString());
|
|
}
|
|
/** If this MN is not REF_newInvokeSpecial, return a clone with that ref. kind.
|
|
* In that case it must already be REF_invokeSpecial.
|
|
*/
|
|
public MemberName asConstructor() {
|
|
switch (getReferenceKind()) {
|
|
case REF_invokeSpecial: return clone().changeReferenceKind(REF_newInvokeSpecial, REF_invokeSpecial);
|
|
case REF_newInvokeSpecial: return this;
|
|
}
|
|
throw new IllegalArgumentException(this.toString());
|
|
}
|
|
/** If this MN is a REF_invokeSpecial, return a clone with the "normal" kind
|
|
* REF_invokeVirtual; also switch either to REF_invokeInterface if clazz.isInterface.
|
|
* The end result is to get a fully virtualized version of the MN.
|
|
* (Note that resolving in the JVM will sometimes devirtualize, changing
|
|
* REF_invokeVirtual of a final to REF_invokeSpecial, and REF_invokeInterface
|
|
* in some corner cases to either of the previous two; this transform
|
|
* undoes that change under the assumption that it occurred.)
|
|
*/
|
|
public MemberName asNormalOriginal() {
|
|
byte normalVirtual = clazz.isInterface() ? REF_invokeInterface : REF_invokeVirtual;
|
|
byte refKind = getReferenceKind();
|
|
byte newRefKind = refKind;
|
|
MemberName result = this;
|
|
switch (refKind) {
|
|
case REF_invokeInterface:
|
|
case REF_invokeVirtual:
|
|
case REF_invokeSpecial:
|
|
newRefKind = normalVirtual;
|
|
break;
|
|
}
|
|
if (newRefKind == refKind)
|
|
return this;
|
|
result = clone().changeReferenceKind(newRefKind, refKind);
|
|
assert(this.referenceKindIsConsistentWith(result.getReferenceKind()));
|
|
return result;
|
|
}
|
|
/** Create a name for the given reflected constructor. The resulting name will be in a resolved state. */
|
|
@SuppressWarnings("LeakingThisInConstructor")
|
|
public MemberName(Constructor<?> ctor) {
|
|
ctor.getClass(); // NPE check
|
|
// fill in vmtarget, vmindex while we have ctor in hand:
|
|
MethodHandleNatives.init(this, ctor);
|
|
assert(isResolved() && this.clazz != null);
|
|
this.name = CONSTRUCTOR_NAME;
|
|
if (this.type == null)
|
|
this.type = new Object[] { void.class, ctor.getParameterTypes() };
|
|
}
|
|
/** Create a name for the given reflected field. The resulting name will be in a resolved state.
|
|
*/
|
|
public MemberName(Field fld) {
|
|
this(fld, false);
|
|
}
|
|
@SuppressWarnings("LeakingThisInConstructor")
|
|
public MemberName(Field fld, boolean makeSetter) {
|
|
fld.getClass(); // NPE check
|
|
// fill in vmtarget, vmindex while we have fld in hand:
|
|
MethodHandleNatives.init(this, fld);
|
|
assert(isResolved() && this.clazz != null);
|
|
this.name = fld.getName();
|
|
this.type = fld.getType();
|
|
assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
|
|
byte refKind = this.getReferenceKind();
|
|
assert(refKind == (isStatic() ? REF_getStatic : REF_getField));
|
|
if (makeSetter) {
|
|
changeReferenceKind((byte)(refKind + (REF_putStatic - REF_getStatic)), refKind);
|
|
}
|
|
}
|
|
public boolean isGetter() {
|
|
return MethodHandleNatives.refKindIsGetter(getReferenceKind());
|
|
}
|
|
public boolean isSetter() {
|
|
return MethodHandleNatives.refKindIsSetter(getReferenceKind());
|
|
}
|
|
public MemberName asSetter() {
|
|
byte refKind = getReferenceKind();
|
|
assert(MethodHandleNatives.refKindIsGetter(refKind));
|
|
assert((REF_putStatic - REF_getStatic) == (REF_putField - REF_getField));
|
|
byte setterRefKind = (byte)(refKind + (REF_putField - REF_getField));
|
|
return clone().changeReferenceKind(setterRefKind, refKind);
|
|
}
|
|
/** Create a name for the given class. The resulting name will be in a resolved state. */
|
|
public MemberName(Class<?> type) {
|
|
init(type.getDeclaringClass(), type.getSimpleName(), type,
|
|
flagsMods(IS_TYPE, type.getModifiers(), REF_NONE));
|
|
initResolved(true);
|
|
}
|
|
|
|
/**
|
|
* Create a name for a signature-polymorphic invoker.
|
|
* This is a placeholder for a signature-polymorphic instance
|
|
* (of MH.invokeExact, etc.) that the JVM does not reify.
|
|
* See comments on {@link MethodHandleNatives#linkMethod}.
|
|
*/
|
|
static MemberName makeMethodHandleInvoke(String name, MethodType type) {
|
|
return makeMethodHandleInvoke(name, type, MH_INVOKE_MODS | SYNTHETIC);
|
|
}
|
|
static MemberName makeMethodHandleInvoke(String name, MethodType type, int mods) {
|
|
MemberName mem = new MemberName(MethodHandle.class, name, type, REF_invokeVirtual);
|
|
mem.flags |= mods; // it's not resolved, but add these modifiers anyway
|
|
assert(mem.isMethodHandleInvoke()) : mem;
|
|
return mem;
|
|
}
|
|
|
|
// 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 newInternalError(ex);
|
|
}
|
|
}
|
|
|
|
/** Get the definition of this member name.
|
|
* This may be in a super-class of the declaring class of this member.
|
|
*/
|
|
public MemberName getDefinition() {
|
|
if (!isResolved()) throw new IllegalStateException("must be resolved: "+this);
|
|
if (isType()) return this;
|
|
MemberName res = this.clone();
|
|
res.clazz = null;
|
|
res.type = null;
|
|
res.name = null;
|
|
res.resolution = res;
|
|
res.expandFromVM();
|
|
assert(res.getName().equals(this.getName()));
|
|
return res;
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return Objects.hash(clazz, getReferenceKind(), name, getType());
|
|
}
|
|
@Override
|
|
public boolean equals(Object that) {
|
|
return (that instanceof MemberName && this.equals((MemberName)that));
|
|
}
|
|
|
|
/** Decide if two member names have exactly the same symbolic content.
|
|
* Does not take into account any actual class members, so even if
|
|
* two member names resolve to the same actual member, they may
|
|
* be distinct references.
|
|
*/
|
|
public boolean equals(MemberName that) {
|
|
if (this == that) return true;
|
|
if (that == null) return false;
|
|
return this.clazz == that.clazz
|
|
&& this.getReferenceKind() == that.getReferenceKind()
|
|
&& Objects.equals(this.name, that.name)
|
|
&& Objects.equals(this.getType(), that.getType());
|
|
}
|
|
|
|
// Construction from symbolic parts, for queries:
|
|
/** Create a field or type name from the given components:
|
|
* Declaring class, name, type, reference kind.
|
|
* The declaring class may be supplied as null if this is to be a bare name and type.
|
|
* The resulting name will in an unresolved state.
|
|
*/
|
|
public MemberName(Class<?> defClass, String name, Class<?> type, byte refKind) {
|
|
init(defClass, name, type, flagsMods(IS_FIELD, 0, refKind));
|
|
initResolved(false);
|
|
}
|
|
/** Create a method or constructor name from the given components:
|
|
* Declaring class, name, type, reference kind.
|
|
* It will be a constructor if and only if the name is {@code "<init>"}.
|
|
* The declaring class may be supplied as null if this is to be a bare name and type.
|
|
* The last argument is optional, a boolean which requests REF_invokeSpecial.
|
|
* The resulting name will in an unresolved state.
|
|
*/
|
|
public MemberName(Class<?> defClass, String name, MethodType type, byte refKind) {
|
|
int initFlags = (name != null && name.equals(CONSTRUCTOR_NAME) ? IS_CONSTRUCTOR : IS_METHOD);
|
|
init(defClass, name, type, flagsMods(initFlags, 0, refKind));
|
|
initResolved(false);
|
|
}
|
|
/** Create a method, constructor, or field name from the given components:
|
|
* Reference kind, declaring class, name, type.
|
|
*/
|
|
public MemberName(byte refKind, Class<?> defClass, String name, Object type) {
|
|
int kindFlags;
|
|
if (MethodHandleNatives.refKindIsField(refKind)) {
|
|
kindFlags = IS_FIELD;
|
|
if (!(type instanceof Class))
|
|
throw newIllegalArgumentException("not a field type");
|
|
} else if (MethodHandleNatives.refKindIsMethod(refKind)) {
|
|
kindFlags = IS_METHOD;
|
|
if (!(type instanceof MethodType))
|
|
throw newIllegalArgumentException("not a method type");
|
|
} else if (refKind == REF_newInvokeSpecial) {
|
|
kindFlags = IS_CONSTRUCTOR;
|
|
if (!(type instanceof MethodType) ||
|
|
!CONSTRUCTOR_NAME.equals(name))
|
|
throw newIllegalArgumentException("not a constructor type or name");
|
|
} else {
|
|
throw newIllegalArgumentException("bad reference kind "+refKind);
|
|
}
|
|
init(defClass, name, type, flagsMods(kindFlags, 0, refKind));
|
|
initResolved(false);
|
|
}
|
|
/** Query whether this member name is resolved to a non-static, non-final method.
|
|
*/
|
|
public boolean hasReceiverTypeDispatch() {
|
|
return MethodHandleNatives.refKindDoesDispatch(getReferenceKind());
|
|
}
|
|
|
|
/** Query whether this member name is resolved.
|
|
* A resolved member name is one for which the JVM has found
|
|
* a method, constructor, field, or type binding corresponding exactly to the name.
|
|
* (Document?)
|
|
*/
|
|
public boolean isResolved() {
|
|
return resolution == null;
|
|
}
|
|
|
|
private void initResolved(boolean isResolved) {
|
|
assert(this.resolution == null); // not initialized yet!
|
|
if (!isResolved)
|
|
this.resolution = this;
|
|
assert(isResolved() == isResolved);
|
|
}
|
|
|
|
void checkForTypeAlias(Class<?> refc) {
|
|
if (isInvocable()) {
|
|
MethodType type;
|
|
if (this.type instanceof MethodType)
|
|
type = (MethodType) this.type;
|
|
else
|
|
this.type = type = getMethodType();
|
|
if (type.erase() == type) return;
|
|
if (VerifyAccess.isTypeVisible(type, refc)) return;
|
|
throw new LinkageError("bad method type alias: "+type+" not visible from "+refc);
|
|
} else {
|
|
Class<?> type;
|
|
if (this.type instanceof Class<?>)
|
|
type = (Class<?>) this.type;
|
|
else
|
|
this.type = type = getFieldType();
|
|
if (VerifyAccess.isTypeVisible(type, refc)) return;
|
|
throw new LinkageError("bad field type alias: "+type+" not visible from "+refc);
|
|
}
|
|
}
|
|
|
|
|
|
/** Produce a string form of this member name.
|
|
* For types, it is simply the type's own string (as reported by {@code toString}).
|
|
* For fields, it is {@code "DeclaringClass.name/type"}.
|
|
* For methods and constructors, it is {@code "DeclaringClass.name(ptype...)rtype"}.
|
|
* If the declaring class is null, the prefix {@code "DeclaringClass."} is omitted.
|
|
* If the member is unresolved, a prefix {@code "*."} is prepended.
|
|
*/
|
|
@SuppressWarnings("LocalVariableHidesMemberVariable")
|
|
@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 (getDeclaringClass() != null) {
|
|
buf.append(getName(clazz));
|
|
buf.append('.');
|
|
}
|
|
String name = getName();
|
|
buf.append(name == null ? "*" : name);
|
|
Object type = getType();
|
|
if (!isInvocable()) {
|
|
buf.append('/');
|
|
buf.append(type == null ? "*" : getName(type));
|
|
} else {
|
|
buf.append(type == null ? "(*)*" : getName(type));
|
|
}
|
|
byte refKind = getReferenceKind();
|
|
if (refKind != REF_NONE) {
|
|
buf.append('/');
|
|
buf.append(MethodHandleNatives.refKindName(refKind));
|
|
}
|
|
//buf.append("#").append(System.identityHashCode(this));
|
|
return buf.toString();
|
|
}
|
|
private static String getName(Object obj) {
|
|
if (obj instanceof Class<?>)
|
|
return ((Class<?>)obj).getName();
|
|
return String.valueOf(obj);
|
|
}
|
|
|
|
public IllegalAccessException makeAccessException(String message, Object from) {
|
|
message = message + ": "+ toString();
|
|
if (from != null) message += ", from " + from;
|
|
return new IllegalAccessException(message);
|
|
}
|
|
private String message() {
|
|
if (isResolved())
|
|
return "no access";
|
|
else if (isConstructor())
|
|
return "no such constructor";
|
|
else if (isMethod())
|
|
return "no such method";
|
|
else
|
|
return "no such field";
|
|
}
|
|
public ReflectiveOperationException makeAccessException() {
|
|
String message = message() + ": "+ toString();
|
|
ReflectiveOperationException ex;
|
|
if (isResolved() || !(resolution instanceof NoSuchMethodError ||
|
|
resolution instanceof NoSuchFieldError))
|
|
ex = new IllegalAccessException(message);
|
|
else if (isConstructor())
|
|
ex = new NoSuchMethodException(message);
|
|
else if (isMethod())
|
|
ex = new NoSuchMethodException(message);
|
|
else
|
|
ex = new NoSuchFieldException(message);
|
|
if (resolution instanceof Throwable)
|
|
ex.initCause((Throwable) resolution);
|
|
return ex;
|
|
}
|
|
|
|
/** Actually making a query requires an access check. */
|
|
/*non-public*/ static Factory getFactory() {
|
|
return Factory.INSTANCE;
|
|
}
|
|
/** A factory type for resolving member names with the help of the VM.
|
|
* TBD: Define access-safe public constructors for this factory.
|
|
*/
|
|
/*non-public*/ static class Factory {
|
|
private Factory() { } // singleton pattern
|
|
static Factory INSTANCE = new Factory();
|
|
|
|
private static int ALLOWED_FLAGS = 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<>(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<>(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;
|
|
}
|
|
/** Produce a resolved version of the given member.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* If lookup fails or access is not permitted, null is returned.
|
|
* Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
|
|
*/
|
|
private MemberName resolve(byte refKind, MemberName ref, Class<?> lookupClass) {
|
|
MemberName m = ref.clone(); // JVM will side-effect the ref
|
|
assert(refKind == m.getReferenceKind());
|
|
try {
|
|
// There are 4 entities in play here:
|
|
// * LC: lookupClass
|
|
// * REFC: symbolic reference class (MN.clazz before resolution);
|
|
// * DEFC: resolved method holder (MN.clazz after resolution);
|
|
// * PTYPES: parameter types (MN.type)
|
|
//
|
|
// What we care about when resolving a MemberName is consistency between DEFC and PTYPES.
|
|
// We do type alias (TA) checks on DEFC to ensure that. DEFC is not known until the JVM
|
|
// finishes the resolution, so do TA checks right after MHN.resolve() is over.
|
|
//
|
|
// All parameters passed by a caller are checked against MH type (PTYPES) on every invocation,
|
|
// so it is safe to call a MH from any context.
|
|
//
|
|
// REFC view on PTYPES doesn't matter, since it is used only as a starting point for resolution and doesn't
|
|
// participate in method selection.
|
|
m = MethodHandleNatives.resolve(m, lookupClass);
|
|
m.checkForTypeAlias(m.getDeclaringClass());
|
|
m.resolution = null;
|
|
} catch (ClassNotFoundException | LinkageError ex) {
|
|
// JVM reports that the "bytecode behavior" would get an error
|
|
assert(!m.isResolved());
|
|
m.resolution = ex;
|
|
return m;
|
|
}
|
|
assert(m.referenceKindIsConsistent());
|
|
m.initResolved(true);
|
|
assert(m.vminfoIsConsistent());
|
|
return m;
|
|
}
|
|
/** Produce a resolved version of the given member.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* If lookup fails or access is not permitted, a {@linkplain ReflectiveOperationException} is thrown.
|
|
* Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
|
|
*/
|
|
public
|
|
<NoSuchMemberException extends ReflectiveOperationException>
|
|
MemberName resolveOrFail(byte refKind, MemberName m, Class<?> lookupClass,
|
|
Class<NoSuchMemberException> nsmClass)
|
|
throws IllegalAccessException, NoSuchMemberException {
|
|
MemberName result = resolve(refKind, m, lookupClass);
|
|
if (result.isResolved())
|
|
return result;
|
|
ReflectiveOperationException ex = result.makeAccessException();
|
|
if (ex instanceof IllegalAccessException) throw (IllegalAccessException) ex;
|
|
throw nsmClass.cast(ex);
|
|
}
|
|
/** Produce a resolved version of the given member.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* If lookup fails or access is not permitted, return null.
|
|
* Otherwise a fresh copy of the given member is returned, with modifier bits filled in.
|
|
*/
|
|
public
|
|
MemberName resolveOrNull(byte refKind, MemberName m, Class<?> lookupClass) {
|
|
MemberName result = resolve(refKind, m, lookupClass);
|
|
if (result.isResolved())
|
|
return result;
|
|
return null;
|
|
}
|
|
/** Return a list of all methods defined by the given class.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
public List<MemberName> getMethods(Class<?> defc, boolean searchSupers,
|
|
Class<?> lookupClass) {
|
|
return getMethods(defc, searchSupers, null, null, lookupClass);
|
|
}
|
|
/** Return a list of matching methods defined by the given class.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Returned methods will match the name (if not null) and the type (if not null).
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
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);
|
|
}
|
|
/** Return a list of all constructors defined by the given class.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
public List<MemberName> getConstructors(Class<?> defc, Class<?> lookupClass) {
|
|
return getMembers(defc, null, null, IS_CONSTRUCTOR, lookupClass);
|
|
}
|
|
/** Return a list of all fields defined by the given class.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
public List<MemberName> getFields(Class<?> defc, boolean searchSupers,
|
|
Class<?> lookupClass) {
|
|
return getFields(defc, searchSupers, null, null, lookupClass);
|
|
}
|
|
/** Return a list of all fields defined by the given class.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Returned fields will match the name (if not null) and the type (if not null).
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
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);
|
|
}
|
|
/** Return a list of all nested types defined by the given class.
|
|
* Super types are searched (for inherited members) if {@code searchSupers} is true.
|
|
* Access checking is performed on behalf of the given {@code lookupClass}.
|
|
* Inaccessible members are not added to the last.
|
|
*/
|
|
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));
|
|
// }
|
|
}
|