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8271820: Implementation of JEP 416: Reimplement Core Reflection with Method Handle

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8013527: calling MethodHandles.lookup on itself leads to errors

Co-authored-by: Peter Levart <plevart@openjdk.org>
Co-authored-by: Claes Redestad <redestad@openjdk.org>
Co-authored-by: Mandy Chung <mchung@openjdk.org>
Reviewed-by: mcimadamore, plevart, egahlin, redestad, cjplummer, alanb
This commit is contained in:
Mandy Chung 2021-10-28 18:32:50 +00:00
parent 5a768f75c9
commit c6339cb8a2
78 changed files with 6118 additions and 544 deletions
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20
src/java.base/share/classes/java/lang/invoke/MethodHandleNatives.java
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@ -25,8 +25,7 @@
package java.lang.invoke;
import jdk.internal.access.JavaLangAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.misc.VM;
import jdk.internal.ref.CleanerFactory;
import sun.invoke.util.Wrapper;
@ -35,7 +34,6 @@ import java.lang.reflect.Field;
import static java.lang.invoke.MethodHandleNatives.Constants.*;
import static java.lang.invoke.MethodHandleStatics.TRACE_METHOD_LINKAGE;
import static java.lang.invoke.MethodHandleStatics.UNSAFE;
import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
/**
@ -248,6 +246,7 @@ class MethodHandleNatives {
return true;
}
static {
VM.setJavaLangInvokeInited();
assert(verifyConstants());
}
@ -665,8 +664,7 @@ class MethodHandleNatives {
static boolean canBeCalledVirtual(MemberName mem) {
assert(mem.isInvocable());
return mem.getName().equals("getContextClassLoader") &&
canBeCalledVirtual(mem, java.lang.Thread.class);
return mem.getName().equals("getContextClassLoader") && canBeCalledVirtual(mem, java.lang.Thread.class);
}
static boolean canBeCalledVirtual(MemberName symbolicRef, Class<?> definingClass) {
@ -676,16 +674,4 @@ class MethodHandleNatives {
return (definingClass.isAssignableFrom(symbolicRefClass) || // Msym overrides Mdef
symbolicRefClass.isInterface()); // Mdef implements Msym
}
private static final JavaLangAccess JLA = SharedSecrets.getJavaLangAccess();
/*
* Returns the class data set by the VM in the Class::classData field.
*
* This is also invoked by LambdaForms as it cannot use condy via
* MethodHandles.classData due to bootstrapping issue.
*/
static Object classData(Class<?> c) {
UNSAFE.ensureClassInitialized(c);
return JLA.classData(c);
}
}