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8210031: implementation for JVM Constants API

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Co-authored-by: Brian Goetz <brian.goetz@oracle.com>
Reviewed-by: jrose, mcimadamore, darcy, mchung, rriggs, dholmes, forax
This commit is contained in:
Vicente Romero 2018-12-09 12:36:24 -05:00
parent b80d335354
commit 9846588b31
72 changed files with 6719 additions and 103 deletions
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65
src/java.base/share/classes/java/lang/invoke/MethodHandle.java
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@ -28,10 +28,19 @@ package java.lang.invoke;
import jdk.internal.HotSpotIntrinsicCandidate;
import java.lang.constant.ClassDesc;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDesc;
import java.lang.constant.DirectMethodHandleDesc;
import java.lang.constant.MethodHandleDesc;
import java.lang.constant.MethodTypeDesc;
import java.util.Arrays;
import java.util.Objects;
import java.util.Optional;
import static java.lang.invoke.MethodHandleInfo.*;
import static java.lang.invoke.MethodHandleStatics.*;
import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
/**
* A method handle is a typed, directly executable reference to an underlying method,
@ -428,7 +437,7 @@ mh.invokeExact(System.out, "Hello, world.");
* @author John Rose, JSR 292 EG
* @since 1.7
*/
public abstract class MethodHandle {
public abstract class MethodHandle implements Constable {
/**
* Internal marker interface which distinguishes (to the Java compiler)
@ -1511,6 +1520,60 @@ assertEquals("[three, thee, tee]", asListFix.invoke((Object)argv).toString());
return bindArgumentL(0, x);
}
/**
* Return a nominal descriptor for this instance, if one can be
* constructed, or an empty {@link Optional} if one cannot be.
*
* @return An {@link Optional} containing the resulting nominal descriptor,
* or an empty {@link Optional} if one cannot be constructed.
* @since 12
*/
@Override
public Optional<MethodHandleDesc> describeConstable() {
MethodHandleInfo info;
ClassDesc owner;
String name;
MethodTypeDesc type;
boolean isInterface;
try {
info = IMPL_LOOKUP.revealDirect(this);
isInterface = info.getDeclaringClass().isInterface();
owner = info.getDeclaringClass().describeConstable().orElseThrow();
type = info.getMethodType().describeConstable().orElseThrow();
name = info.getName();
}
catch (Exception e) {
return Optional.empty();
}
switch (info.getReferenceKind()) {
case REF_getField:
return Optional.of(MethodHandleDesc.ofField(DirectMethodHandleDesc.Kind.GETTER, owner, name, type.returnType()));
case REF_putField:
return Optional.of(MethodHandleDesc.ofField(DirectMethodHandleDesc.Kind.SETTER, owner, name, type.parameterType(0)));
case REF_getStatic:
return Optional.of(MethodHandleDesc.ofField(DirectMethodHandleDesc.Kind.STATIC_GETTER, owner, name, type.returnType()));
case REF_putStatic:
return Optional.of(MethodHandleDesc.ofField(DirectMethodHandleDesc.Kind.STATIC_SETTER, owner, name, type.parameterType(0)));
case REF_invokeVirtual:
return Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.VIRTUAL, owner, name, type));
case REF_invokeStatic:
return isInterface ?
Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.INTERFACE_STATIC, owner, name, type)) :
Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.STATIC, owner, name, type));
case REF_invokeSpecial:
return isInterface ?
Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.INTERFACE_SPECIAL, owner, name, type)) :
Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.SPECIAL, owner, name, type));
case REF_invokeInterface:
return Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.INTERFACE_VIRTUAL, owner, name, type));
case REF_newInvokeSpecial:
return Optional.of(MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.CONSTRUCTOR, owner, name, type));
default:
return Optional.empty();
}
}
/**
* Returns a string representation of the method handle,
* starting with the string {@code "MethodHandle"} and