JDK 17 java.base.jmod - Base Module
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⏎ java/lang/constant/DirectMethodHandleDesc.java
/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.lang.constant;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandleInfo;
import java.util.OptionalInt;
import java.util.stream.Stream;
import jdk.internal.vm.annotation.Stable;
import static java.lang.invoke.MethodHandleInfo.REF_getField;
import static java.lang.invoke.MethodHandleInfo.REF_getStatic;
import static java.lang.invoke.MethodHandleInfo.REF_invokeInterface;
import static java.lang.invoke.MethodHandleInfo.REF_invokeSpecial;
import static java.lang.invoke.MethodHandleInfo.REF_invokeStatic;
import static java.lang.invoke.MethodHandleInfo.REF_invokeVirtual;
import static java.lang.invoke.MethodHandleInfo.REF_newInvokeSpecial;
import static java.lang.invoke.MethodHandleInfo.REF_putField;
import static java.lang.invoke.MethodHandleInfo.REF_putStatic;
/**
* A <a href="package-summary.html#nominal">nominal descriptor</a> for a direct
* {@link MethodHandle}. A {@linkplain DirectMethodHandleDesc} corresponds to
* a {@code Constant_MethodHandle_info} entry in the constant pool of a classfile.
*
* @since 12
*/
public sealed interface DirectMethodHandleDesc
extends MethodHandleDesc
permits DirectMethodHandleDescImpl {
/**
* Kinds of method handles that can be described with {@linkplain DirectMethodHandleDesc}.
*
* @since 12
*/
enum Kind {
/** A method handle for a method invoked as with {@code invokestatic} */
STATIC(REF_invokeStatic),
/** A method handle for a method invoked as with {@code invokestatic} */
INTERFACE_STATIC(REF_invokeStatic, true),
/** A method handle for a method invoked as with {@code invokevirtual} */
VIRTUAL(REF_invokeVirtual),
/** A method handle for a method invoked as with {@code invokeinterface} */
INTERFACE_VIRTUAL(REF_invokeInterface, true),
/** A method handle for a method invoked as with {@code invokespecial} */
SPECIAL(REF_invokeSpecial),
/** A method handle for an interface method invoked as with {@code invokespecial} */
INTERFACE_SPECIAL(REF_invokeSpecial, true),
/** A method handle for a constructor */
CONSTRUCTOR(REF_newInvokeSpecial),
/** A method handle for a read accessor for an instance field */
GETTER(REF_getField),
/** A method handle for a write accessor for an instance field */
SETTER(REF_putField),
/** A method handle for a read accessor for a static field */
STATIC_GETTER(REF_getStatic),
/** A method handle for a write accessor for a static field */
STATIC_SETTER(REF_putStatic);
/** The corresponding {@code refKind} value for this kind of method handle,
* as defined by {@link MethodHandleInfo}
*/
public final int refKind;
/** Is this an interface
*/
public final boolean isInterface;
Kind(int refKind) {
this(refKind, false);
}
Kind(int refKind, boolean isInterface) { this.refKind = refKind; this.isInterface = isInterface; }
/**
* Returns the enumeration member with the given {@code refKind} field.
* Behaves as if {@code valueOf(refKind, false)}. As a special case,
* if {@code refKind} is {@code REF_invokeInterface} (9) then the
* {@code isInterface} field will be true.
*
* @param refKind refKind of desired member
* @return the matching enumeration member
* @throws IllegalArgumentException if there is no such member
*/
public static Kind valueOf(int refKind) {
return valueOf(refKind, refKind == REF_invokeInterface);
}
/**
* Returns the enumeration member with the given the {@code refKind} and
* {@code isInterface} arguments.
* For most values of {@code refKind} there is an exact match regardless of the value of {@code isInterface}.
* These are:
* <UL>
* <LI>{@code REF_invokeVirtual} which matches to {@code VIRTUAL}
* <LI>{@code REF_invokeInterface} which matches to {@code INTERFACE_VIRTUAL}
* <LI>{@code REF_newInvokeSpecial} which matches to {@code CONSTRUCTOR}
* <LI>{@code REF_getField} which matches to {@code GETTER}
* <LI>{@code REF_putField} which matches to {@code SETTER}
* <LI>{@code REF_getStatic} which matches to {@code STATIC_GETTER}
* <LI>{@code REF_putStatic} which matches to {@code STATIC_SETTER}
* </UL>
* As for the rest, the returned kind will depend on the value (false or true accordingly) of {@code isInterface}:
* <UL>
* <LI>{@code REF_invokeStatic} which matches to {@code STATIC} or {@code INTERFACE_STATIC}
* <LI>{@code REF_invokeSpecial} which matches to {@code SPECIAL} or {@code INTERFACE_SPECIAL}
* </UL>
* @param refKind refKind of desired member
* @param isInterface whether desired member is for interface methods
* @return the matching enumeration member
* @throws IllegalArgumentException if there is no such member
*/
public static Kind valueOf(int refKind, boolean isInterface) {
int i = tableIndex(refKind, isInterface);
if (i >= 2 && i < TABLE.length) {
return TABLE[i];
}
throw new IllegalArgumentException(String.format("refKind=%d isInterface=%s", refKind, isInterface));
}
private static int tableIndex(int refKind, boolean isInterface) {
if (refKind < 0) return refKind;
return (refKind * 2) + (isInterface ? 1 : 0);
}
private static final @Stable Kind[] TABLE;
static {
// Pack the static table.
int max = 0;
for (Kind k : values())
max = Math.max(max, tableIndex(k.refKind, true));
TABLE = new Kind[max+1];
for (Kind kind : values()) {
int i = tableIndex(kind.refKind, kind.isInterface);
if (i >= TABLE.length || TABLE[i] != null)
throw new AssertionError("TABLE entry for " + kind);
TABLE[i] = kind;
}
// Pack in some aliases also.
int ii = tableIndex(REF_invokeInterface, false);
if (TABLE[ii] != null)
throw new AssertionError("TABLE entry for (invokeInterface, false) used by " + TABLE[ii]);
TABLE[ii] = INTERFACE_VIRTUAL;
for (Kind kind : values()) {
if (!kind.isInterface) {
// Add extra cache entry to alias the isInterface case.
// For example, (REF_getStatic, X) will produce STATIC_GETTER
// for either truth value of X.
int i = tableIndex(kind.refKind, true);
if (TABLE[i] == null) {
TABLE[i] = kind;
}
}
}
}
/**
* Does this {@code Kind} correspond to a virtual method invocation?
*
* @return if this {@code Kind} corresponds to a virtual method invocation
*/
boolean isVirtualMethod() {
switch (this) {
case VIRTUAL:
case SPECIAL:
case INTERFACE_VIRTUAL:
case INTERFACE_SPECIAL:
return true;
default:
return false;
}
}
}
/**
* Returns the {@code kind} of the method handle described by this nominal
* descriptor.
*
* @return the {@link Kind}
*/
Kind kind();
/**
* Returns the {@code refKind} of the method handle described by this nominal
* reference, as defined by {@link MethodHandleInfo}.
*
* @return the reference kind
*/
int refKind();
/**
* Indicates if the method is declared by an interface
*
* @return true if the method is declared by an interface
*/
boolean isOwnerInterface();
/**
* Returns a {@link ClassDesc} describing the class declaring the
* method or field described by this nominal descriptor.
*
* @return the class declaring the method or field
*/
ClassDesc owner();
/**
* Returns the name of the method or field described by this nominal descriptor.
* For constructors, returns the reserved name {@code "<init>"}.
*
* @return the name of the method or field
*/
String methodName();
/**
* Returns the lookup descriptor of the method handle described by this descriptor,
* after adjusting for the invocation mode. This will correspond to either
* a method type descriptor string (for methods and constructors), or a field
* descriptor string (for field access method handles). The lookup descriptor
* string is in the same format as accepted by {@link MethodHandleDesc#of(Kind, ClassDesc, String, String)}.
*
* @return the lookup descriptor string
*/
String lookupDescriptor();
}
⏎ java/lang/constant/DirectMethodHandleDesc.java
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