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/*
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import sun.misc.Unsafe;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import sun.invoke.util.VerifyAccess;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.LambdaForm.*;
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import static java.lang.invoke.MethodTypeForm.*;
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import static java.lang.invoke.MethodHandleStatics.*;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Field;
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import sun.invoke.util.ValueConversions;
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import sun.invoke.util.VerifyType;
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import sun.invoke.util.Wrapper;
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/**
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* The flavor of method handle which implements a constant reference
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* to a class member.
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* @author jrose
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*/
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class DirectMethodHandle extends MethodHandle {
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final MemberName member;
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// Constructors and factory methods in this class *must* be package scoped or private.
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private DirectMethodHandle(MethodType mtype, LambdaForm form, MemberName member) {
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super(mtype, form);
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if (!member.isResolved()) throw new InternalError();
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if (member.getDeclaringClass().isInterface() &&
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member.isMethod() && !member.isAbstract()) {
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// Check for corner case: invokeinterface of Object method
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MemberName m = new MemberName(Object.class, member.getName(), member.getMethodType(), member.getReferenceKind());
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m = MemberName.getFactory().resolveOrNull(m.getReferenceKind(), m, null);
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if (m != null && m.isPublic()) {
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member = m;
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}
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}
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this.member = member;
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}
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// Factory methods:
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static DirectMethodHandle make(byte refKind, Class<?> receiver, MemberName member) {
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MethodType mtype = member.getMethodOrFieldType();
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if (!member.isStatic()) {
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if (!member.getDeclaringClass().isAssignableFrom(receiver) || member.isConstructor())
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throw new InternalError(member.toString());
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mtype = mtype.insertParameterTypes(0, receiver);
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}
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if (!member.isField()) {
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if (refKind == REF_invokeSpecial) {
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member = member.asSpecial();
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LambdaForm lform = preparedLambdaForm(member);
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return new Special(mtype, lform, member);
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} else {
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LambdaForm lform = preparedLambdaForm(member);
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return new DirectMethodHandle(mtype, lform, member);
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}
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} else {
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LambdaForm lform = preparedFieldLambdaForm(member);
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if (member.isStatic()) {
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long offset = MethodHandleNatives.staticFieldOffset(member);
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Object base = MethodHandleNatives.staticFieldBase(member);
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return new StaticAccessor(mtype, lform, member, base, offset);
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} else {
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long offset = MethodHandleNatives.objectFieldOffset(member);
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assert(offset == (int)offset);
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return new Accessor(mtype, lform, member, (int)offset);
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}
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}
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}
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static DirectMethodHandle make(Class<?> receiver, MemberName member) {
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byte refKind = member.getReferenceKind();
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if (refKind == REF_invokeSpecial)
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refKind = REF_invokeVirtual;
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return make(refKind, receiver, member);
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}
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static DirectMethodHandle make(MemberName member) {
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if (member.isConstructor())
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return makeAllocator(member);
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return make(member.getDeclaringClass(), member);
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}
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static DirectMethodHandle make(Method method) {
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return make(method.getDeclaringClass(), new MemberName(method));
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}
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static DirectMethodHandle make(Field field) {
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return make(field.getDeclaringClass(), new MemberName(field));
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}
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private static DirectMethodHandle makeAllocator(MemberName ctor) {
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assert(ctor.isConstructor() && ctor.getName().equals("<init>"));
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Class<?> instanceClass = ctor.getDeclaringClass();
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ctor = ctor.asConstructor();
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assert(ctor.isConstructor() && ctor.getReferenceKind() == REF_newInvokeSpecial) : ctor;
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MethodType mtype = ctor.getMethodType().changeReturnType(instanceClass);
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LambdaForm lform = preparedLambdaForm(ctor);
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MemberName init = ctor.asSpecial();
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assert(init.getMethodType().returnType() == void.class);
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return new Constructor(mtype, lform, ctor, init, instanceClass);
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}
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@Override
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MethodHandle copyWith(MethodType mt, LambdaForm lf) {
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return new DirectMethodHandle(mt, lf, member);
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}
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@Override
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String internalProperties() {
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return "/DMH="+member.toString();
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}
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//// Implementation methods.
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@Override
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MethodHandle viewAsType(MethodType newType) {
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return new DirectMethodHandle(newType, form, member);
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}
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@Override
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@ForceInline
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MemberName internalMemberName() {
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return member;
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}
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@Override
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MethodHandle bindArgument(int pos, char basicType, Object value) {
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// If the member needs dispatching, do so.
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if (pos == 0 && basicType == 'L') {
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DirectMethodHandle concrete = maybeRebind(value);
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if (concrete != null)
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return concrete.bindReceiver(value);
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}
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return super.bindArgument(pos, basicType, value);
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}
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@Override
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MethodHandle bindReceiver(Object receiver) {
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// If the member needs dispatching, do so.
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DirectMethodHandle concrete = maybeRebind(receiver);
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if (concrete != null)
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return concrete.bindReceiver(receiver);
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return super.bindReceiver(receiver);
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}
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private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory();
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private DirectMethodHandle maybeRebind(Object receiver) {
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if (receiver != null) {
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switch (member.getReferenceKind()) {
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case REF_invokeInterface:
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case REF_invokeVirtual:
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// Pre-dispatch the member.
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Class<?> concreteClass = receiver.getClass();
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MemberName concrete = new MemberName(concreteClass, member.getName(), member.getMethodType(), REF_invokeSpecial);
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concrete = IMPL_NAMES.resolveOrNull(REF_invokeSpecial, concrete, concreteClass);
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if (concrete != null)
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return new DirectMethodHandle(type(), preparedLambdaForm(concrete), concrete);
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break;
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}
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}
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return null;
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}
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/**
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* Create a LF which can invoke the given method.
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* Cache and share this structure among all methods with
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* the same basicType and refKind.
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*/
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private static LambdaForm preparedLambdaForm(MemberName m) {
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assert(m.isInvocable()) : m; // call preparedFieldLambdaForm instead
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MethodType mtype = m.getInvocationType().basicType();
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assert(!m.isMethodHandleInvoke() || "invokeBasic".equals(m.getName())) : m;
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int which;
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switch (m.getReferenceKind()) {
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case REF_invokeVirtual: which = LF_INVVIRTUAL; break;
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case REF_invokeStatic: which = LF_INVSTATIC; break;
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case REF_invokeSpecial: which = LF_INVSPECIAL; break;
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case REF_invokeInterface: which = LF_INVINTERFACE; break;
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case REF_newInvokeSpecial: which = LF_NEWINVSPECIAL; break;
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default: throw new InternalError(m.toString());
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}
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if (which == LF_INVSTATIC && shouldBeInitialized(m)) {
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// precompute the barrier-free version:
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preparedLambdaForm(mtype, which);
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which = LF_INVSTATIC_INIT;
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}
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LambdaForm lform = preparedLambdaForm(mtype, which);
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maybeCompile(lform, m);
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assert(lform.methodType().dropParameterTypes(0, 1)
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.equals(m.getInvocationType().basicType()))
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: Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());
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return lform;
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}
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private static LambdaForm preparedLambdaForm(MethodType mtype, int which) {
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LambdaForm lform = mtype.form().cachedLambdaForm(which);
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if (lform != null) return lform;
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lform = makePreparedLambdaForm(mtype, which);
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return mtype.form().setCachedLambdaForm(which, lform);
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}
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private static LambdaForm makePreparedLambdaForm(MethodType mtype, int which) {
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boolean needsInit = (which == LF_INVSTATIC_INIT);
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boolean doesAlloc = (which == LF_NEWINVSPECIAL);
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String linkerName, lambdaName;
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switch (which) {
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case LF_INVVIRTUAL: linkerName = "linkToVirtual"; lambdaName = "DMH.invokeVirtual"; break;
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case LF_INVSTATIC: linkerName = "linkToStatic"; lambdaName = "DMH.invokeStatic"; break;
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case LF_INVSTATIC_INIT:linkerName = "linkToStatic"; lambdaName = "DMH.invokeStaticInit"; break;
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case LF_INVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.invokeSpecial"; break;
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case LF_INVINTERFACE: linkerName = "linkToInterface"; lambdaName = "DMH.invokeInterface"; break;
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case LF_NEWINVSPECIAL: linkerName = "linkToSpecial"; lambdaName = "DMH.newInvokeSpecial"; break;
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default: throw new InternalError("which="+which);
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}
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MethodType mtypeWithArg = mtype.appendParameterTypes(MemberName.class);
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if (doesAlloc)
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mtypeWithArg = mtypeWithArg
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.insertParameterTypes(0, Object.class) // insert newly allocated obj
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.changeReturnType(void.class); // <init> returns void
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MemberName linker = new MemberName(MethodHandle.class, linkerName, mtypeWithArg, REF_invokeStatic);
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try {
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linker = IMPL_NAMES.resolveOrFail(REF_invokeStatic, linker, null, NoSuchMethodException.class);
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} catch (ReflectiveOperationException ex) {
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throw newInternalError(ex);
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}
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final int DMH_THIS = 0;
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final int ARG_BASE = 1;
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final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
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int nameCursor = ARG_LIMIT;
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final int NEW_OBJ = (doesAlloc ? nameCursor++ : -1);
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final int GET_MEMBER = nameCursor++;
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final int LINKER_CALL = nameCursor++;
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Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
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assert(names.length == nameCursor);
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if (doesAlloc) {
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// names = { argx,y,z,... new C, init method }
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names[NEW_OBJ] = new Name(Lazy.NF_allocateInstance, names[DMH_THIS]);
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names[GET_MEMBER] = new Name(Lazy.NF_constructorMethod, names[DMH_THIS]);
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} else if (needsInit) {
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names[GET_MEMBER] = new Name(Lazy.NF_internalMemberNameEnsureInit, names[DMH_THIS]);
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} else {
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names[GET_MEMBER] = new Name(Lazy.NF_internalMemberName, names[DMH_THIS]);
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}
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Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, GET_MEMBER+1, Object[].class);
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assert(outArgs[outArgs.length-1] == names[GET_MEMBER]); // look, shifted args!
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int result = LambdaForm.LAST_RESULT;
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if (doesAlloc) {
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assert(outArgs[outArgs.length-2] == names[NEW_OBJ]); // got to move this one
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System.arraycopy(outArgs, 0, outArgs, 1, outArgs.length-2);
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outArgs[0] = names[NEW_OBJ];
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result = NEW_OBJ;
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}
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names[LINKER_CALL] = new Name(linker, outArgs);
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lambdaName += "_" + LambdaForm.basicTypeSignature(mtype);
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LambdaForm lform = new LambdaForm(lambdaName, ARG_LIMIT, names, result);
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// This is a tricky bit of code. Don't send it through the LF interpreter.
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|
280 |
lform.compileToBytecode();
|
jaroslav@1646
|
281 |
return lform;
|
jaroslav@1646
|
282 |
}
|
jaroslav@1646
|
283 |
|
jaroslav@1646
|
284 |
private static void maybeCompile(LambdaForm lform, MemberName m) {
|
jaroslav@1646
|
285 |
if (VerifyAccess.isSamePackage(m.getDeclaringClass(), MethodHandle.class))
|
jaroslav@1646
|
286 |
// Help along bootstrapping...
|
jaroslav@1646
|
287 |
lform.compileToBytecode();
|
jaroslav@1646
|
288 |
}
|
jaroslav@1646
|
289 |
|
jaroslav@1646
|
290 |
/** Static wrapper for DirectMethodHandle.internalMemberName. */
|
jaroslav@1646
|
291 |
@ForceInline
|
jaroslav@1646
|
292 |
/*non-public*/ static Object internalMemberName(Object mh) {
|
jaroslav@1646
|
293 |
return ((DirectMethodHandle)mh).member;
|
jaroslav@1646
|
294 |
}
|
jaroslav@1646
|
295 |
|
jaroslav@1646
|
296 |
/** Static wrapper for DirectMethodHandle.internalMemberName.
|
jaroslav@1646
|
297 |
* This one also forces initialization.
|
jaroslav@1646
|
298 |
*/
|
jaroslav@1646
|
299 |
/*non-public*/ static Object internalMemberNameEnsureInit(Object mh) {
|
jaroslav@1646
|
300 |
DirectMethodHandle dmh = (DirectMethodHandle)mh;
|
jaroslav@1646
|
301 |
dmh.ensureInitialized();
|
jaroslav@1646
|
302 |
return dmh.member;
|
jaroslav@1646
|
303 |
}
|
jaroslav@1646
|
304 |
|
jaroslav@1646
|
305 |
/*non-public*/ static
|
jaroslav@1646
|
306 |
boolean shouldBeInitialized(MemberName member) {
|
jaroslav@1646
|
307 |
switch (member.getReferenceKind()) {
|
jaroslav@1646
|
308 |
case REF_invokeStatic:
|
jaroslav@1646
|
309 |
case REF_getStatic:
|
jaroslav@1646
|
310 |
case REF_putStatic:
|
jaroslav@1646
|
311 |
case REF_newInvokeSpecial:
|
jaroslav@1646
|
312 |
break;
|
jaroslav@1646
|
313 |
default:
|
jaroslav@1646
|
314 |
// No need to initialize the class on this kind of member.
|
jaroslav@1646
|
315 |
return false;
|
jaroslav@1646
|
316 |
}
|
jaroslav@1646
|
317 |
Class<?> cls = member.getDeclaringClass();
|
jaroslav@1646
|
318 |
if (cls == ValueConversions.class ||
|
jaroslav@1646
|
319 |
cls == MethodHandleImpl.class ||
|
jaroslav@1646
|
320 |
cls == Invokers.class) {
|
jaroslav@1646
|
321 |
// These guys have lots of <clinit> DMH creation but we know
|
jaroslav@1646
|
322 |
// the MHs will not be used until the system is booted.
|
jaroslav@1646
|
323 |
return false;
|
jaroslav@1646
|
324 |
}
|
jaroslav@1646
|
325 |
if (VerifyAccess.isSamePackage(MethodHandle.class, cls) ||
|
jaroslav@1646
|
326 |
VerifyAccess.isSamePackage(ValueConversions.class, cls)) {
|
jaroslav@1646
|
327 |
// It is a system class. It is probably in the process of
|
jaroslav@1646
|
328 |
// being initialized, but we will help it along just to be safe.
|
jaroslav@1646
|
329 |
if (UNSAFE.shouldBeInitialized(cls)) {
|
jaroslav@1646
|
330 |
UNSAFE.ensureClassInitialized(cls);
|
jaroslav@1646
|
331 |
}
|
jaroslav@1646
|
332 |
return false;
|
jaroslav@1646
|
333 |
}
|
jaroslav@1646
|
334 |
return UNSAFE.shouldBeInitialized(cls);
|
jaroslav@1646
|
335 |
}
|
jaroslav@1646
|
336 |
|
jaroslav@1646
|
337 |
private static class EnsureInitialized extends ClassValue<WeakReference<Thread>> {
|
jaroslav@1646
|
338 |
@Override
|
jaroslav@1646
|
339 |
protected WeakReference<Thread> computeValue(Class<?> type) {
|
jaroslav@1646
|
340 |
UNSAFE.ensureClassInitialized(type);
|
jaroslav@1646
|
341 |
if (UNSAFE.shouldBeInitialized(type))
|
jaroslav@1646
|
342 |
// If the previous call didn't block, this can happen.
|
jaroslav@1646
|
343 |
// We are executing inside <clinit>.
|
jaroslav@1646
|
344 |
return new WeakReference<>(Thread.currentThread());
|
jaroslav@1646
|
345 |
return null;
|
jaroslav@1646
|
346 |
}
|
jaroslav@1646
|
347 |
static final EnsureInitialized INSTANCE = new EnsureInitialized();
|
jaroslav@1646
|
348 |
}
|
jaroslav@1646
|
349 |
|
jaroslav@1646
|
350 |
private void ensureInitialized() {
|
jaroslav@1646
|
351 |
if (checkInitialized(member)) {
|
jaroslav@1646
|
352 |
// The coast is clear. Delete the <clinit> barrier.
|
jaroslav@1646
|
353 |
if (member.isField())
|
jaroslav@1646
|
354 |
updateForm(preparedFieldLambdaForm(member));
|
jaroslav@1646
|
355 |
else
|
jaroslav@1646
|
356 |
updateForm(preparedLambdaForm(member));
|
jaroslav@1646
|
357 |
}
|
jaroslav@1646
|
358 |
}
|
jaroslav@1646
|
359 |
private static boolean checkInitialized(MemberName member) {
|
jaroslav@1646
|
360 |
Class<?> defc = member.getDeclaringClass();
|
jaroslav@1646
|
361 |
WeakReference<Thread> ref = EnsureInitialized.INSTANCE.get(defc);
|
jaroslav@1646
|
362 |
if (ref == null) {
|
jaroslav@1646
|
363 |
return true; // the final state
|
jaroslav@1646
|
364 |
}
|
jaroslav@1646
|
365 |
Thread clinitThread = ref.get();
|
jaroslav@1646
|
366 |
// Somebody may still be running defc.<clinit>.
|
jaroslav@1646
|
367 |
if (clinitThread == Thread.currentThread()) {
|
jaroslav@1646
|
368 |
// If anybody is running defc.<clinit>, it is this thread.
|
jaroslav@1646
|
369 |
if (UNSAFE.shouldBeInitialized(defc))
|
jaroslav@1646
|
370 |
// Yes, we are running it; keep the barrier for now.
|
jaroslav@1646
|
371 |
return false;
|
jaroslav@1646
|
372 |
} else {
|
jaroslav@1646
|
373 |
// We are in a random thread. Block.
|
jaroslav@1646
|
374 |
UNSAFE.ensureClassInitialized(defc);
|
jaroslav@1646
|
375 |
}
|
jaroslav@1646
|
376 |
assert(!UNSAFE.shouldBeInitialized(defc));
|
jaroslav@1646
|
377 |
// put it into the final state
|
jaroslav@1646
|
378 |
EnsureInitialized.INSTANCE.remove(defc);
|
jaroslav@1646
|
379 |
return true;
|
jaroslav@1646
|
380 |
}
|
jaroslav@1646
|
381 |
|
jaroslav@1646
|
382 |
/*non-public*/ static void ensureInitialized(Object mh) {
|
jaroslav@1646
|
383 |
((DirectMethodHandle)mh).ensureInitialized();
|
jaroslav@1646
|
384 |
}
|
jaroslav@1646
|
385 |
|
jaroslav@1646
|
386 |
/** This subclass represents invokespecial instructions. */
|
jaroslav@1646
|
387 |
static class Special extends DirectMethodHandle {
|
jaroslav@1646
|
388 |
private Special(MethodType mtype, LambdaForm form, MemberName member) {
|
jaroslav@1646
|
389 |
super(mtype, form, member);
|
jaroslav@1646
|
390 |
}
|
jaroslav@1646
|
391 |
@Override
|
jaroslav@1646
|
392 |
boolean isInvokeSpecial() {
|
jaroslav@1646
|
393 |
return true;
|
jaroslav@1646
|
394 |
}
|
jaroslav@1646
|
395 |
@Override
|
jaroslav@1646
|
396 |
MethodHandle viewAsType(MethodType newType) {
|
jaroslav@1646
|
397 |
return new Special(newType, form, member);
|
jaroslav@1646
|
398 |
}
|
jaroslav@1646
|
399 |
}
|
jaroslav@1646
|
400 |
|
jaroslav@1646
|
401 |
/** This subclass handles constructor references. */
|
jaroslav@1646
|
402 |
static class Constructor extends DirectMethodHandle {
|
jaroslav@1646
|
403 |
final MemberName initMethod;
|
jaroslav@1646
|
404 |
final Class<?> instanceClass;
|
jaroslav@1646
|
405 |
|
jaroslav@1646
|
406 |
private Constructor(MethodType mtype, LambdaForm form, MemberName constructor,
|
jaroslav@1646
|
407 |
MemberName initMethod, Class<?> instanceClass) {
|
jaroslav@1646
|
408 |
super(mtype, form, constructor);
|
jaroslav@1646
|
409 |
this.initMethod = initMethod;
|
jaroslav@1646
|
410 |
this.instanceClass = instanceClass;
|
jaroslav@1646
|
411 |
assert(initMethod.isResolved());
|
jaroslav@1646
|
412 |
}
|
jaroslav@1646
|
413 |
@Override
|
jaroslav@1646
|
414 |
MethodHandle viewAsType(MethodType newType) {
|
jaroslav@1646
|
415 |
return new Constructor(newType, form, member, initMethod, instanceClass);
|
jaroslav@1646
|
416 |
}
|
jaroslav@1646
|
417 |
}
|
jaroslav@1646
|
418 |
|
jaroslav@1646
|
419 |
/*non-public*/ static Object constructorMethod(Object mh) {
|
jaroslav@1646
|
420 |
Constructor dmh = (Constructor)mh;
|
jaroslav@1646
|
421 |
return dmh.initMethod;
|
jaroslav@1646
|
422 |
}
|
jaroslav@1646
|
423 |
|
jaroslav@1646
|
424 |
/*non-public*/ static Object allocateInstance(Object mh) throws InstantiationException {
|
jaroslav@1646
|
425 |
Constructor dmh = (Constructor)mh;
|
jaroslav@1646
|
426 |
return UNSAFE.allocateInstance(dmh.instanceClass);
|
jaroslav@1646
|
427 |
}
|
jaroslav@1646
|
428 |
|
jaroslav@1646
|
429 |
/** This subclass handles non-static field references. */
|
jaroslav@1646
|
430 |
static class Accessor extends DirectMethodHandle {
|
jaroslav@1646
|
431 |
final Class<?> fieldType;
|
jaroslav@1646
|
432 |
final int fieldOffset;
|
jaroslav@1646
|
433 |
private Accessor(MethodType mtype, LambdaForm form, MemberName member,
|
jaroslav@1646
|
434 |
int fieldOffset) {
|
jaroslav@1646
|
435 |
super(mtype, form, member);
|
jaroslav@1646
|
436 |
this.fieldType = member.getFieldType();
|
jaroslav@1646
|
437 |
this.fieldOffset = fieldOffset;
|
jaroslav@1646
|
438 |
}
|
jaroslav@1646
|
439 |
|
jaroslav@1646
|
440 |
@Override Object checkCast(Object obj) {
|
jaroslav@1646
|
441 |
return fieldType.cast(obj);
|
jaroslav@1646
|
442 |
}
|
jaroslav@1646
|
443 |
@Override
|
jaroslav@1646
|
444 |
MethodHandle viewAsType(MethodType newType) {
|
jaroslav@1646
|
445 |
return new Accessor(newType, form, member, fieldOffset);
|
jaroslav@1646
|
446 |
}
|
jaroslav@1646
|
447 |
}
|
jaroslav@1646
|
448 |
|
jaroslav@1646
|
449 |
@ForceInline
|
jaroslav@1646
|
450 |
/*non-public*/ static long fieldOffset(Object accessorObj) {
|
jaroslav@1646
|
451 |
// Note: We return a long because that is what Unsafe.getObject likes.
|
jaroslav@1646
|
452 |
// We store a plain int because it is more compact.
|
jaroslav@1646
|
453 |
return ((Accessor)accessorObj).fieldOffset;
|
jaroslav@1646
|
454 |
}
|
jaroslav@1646
|
455 |
|
jaroslav@1646
|
456 |
@ForceInline
|
jaroslav@1646
|
457 |
/*non-public*/ static Object checkBase(Object obj) {
|
jaroslav@1646
|
458 |
// Note that the object's class has already been verified,
|
jaroslav@1646
|
459 |
// since the parameter type of the Accessor method handle
|
jaroslav@1646
|
460 |
// is either member.getDeclaringClass or a subclass.
|
jaroslav@1646
|
461 |
// This was verified in DirectMethodHandle.make.
|
jaroslav@1646
|
462 |
// Therefore, the only remaining check is for null.
|
jaroslav@1646
|
463 |
// Since this check is *not* guaranteed by Unsafe.getInt
|
jaroslav@1646
|
464 |
// and its siblings, we need to make an explicit one here.
|
jaroslav@1646
|
465 |
obj.getClass(); // maybe throw NPE
|
jaroslav@1646
|
466 |
return obj;
|
jaroslav@1646
|
467 |
}
|
jaroslav@1646
|
468 |
|
jaroslav@1646
|
469 |
/** This subclass handles static field references. */
|
jaroslav@1646
|
470 |
static class StaticAccessor extends DirectMethodHandle {
|
jaroslav@1646
|
471 |
final private Class<?> fieldType;
|
jaroslav@1646
|
472 |
final private Object staticBase;
|
jaroslav@1646
|
473 |
final private long staticOffset;
|
jaroslav@1646
|
474 |
|
jaroslav@1646
|
475 |
private StaticAccessor(MethodType mtype, LambdaForm form, MemberName member,
|
jaroslav@1646
|
476 |
Object staticBase, long staticOffset) {
|
jaroslav@1646
|
477 |
super(mtype, form, member);
|
jaroslav@1646
|
478 |
this.fieldType = member.getFieldType();
|
jaroslav@1646
|
479 |
this.staticBase = staticBase;
|
jaroslav@1646
|
480 |
this.staticOffset = staticOffset;
|
jaroslav@1646
|
481 |
}
|
jaroslav@1646
|
482 |
|
jaroslav@1646
|
483 |
@Override Object checkCast(Object obj) {
|
jaroslav@1646
|
484 |
return fieldType.cast(obj);
|
jaroslav@1646
|
485 |
}
|
jaroslav@1646
|
486 |
@Override
|
jaroslav@1646
|
487 |
MethodHandle viewAsType(MethodType newType) {
|
jaroslav@1646
|
488 |
return new StaticAccessor(newType, form, member, staticBase, staticOffset);
|
jaroslav@1646
|
489 |
}
|
jaroslav@1646
|
490 |
}
|
jaroslav@1646
|
491 |
|
jaroslav@1646
|
492 |
@ForceInline
|
jaroslav@1646
|
493 |
/*non-public*/ static Object nullCheck(Object obj) {
|
jaroslav@1646
|
494 |
obj.getClass();
|
jaroslav@1646
|
495 |
return obj;
|
jaroslav@1646
|
496 |
}
|
jaroslav@1646
|
497 |
|
jaroslav@1646
|
498 |
@ForceInline
|
jaroslav@1646
|
499 |
/*non-public*/ static Object staticBase(Object accessorObj) {
|
jaroslav@1646
|
500 |
return ((StaticAccessor)accessorObj).staticBase;
|
jaroslav@1646
|
501 |
}
|
jaroslav@1646
|
502 |
|
jaroslav@1646
|
503 |
@ForceInline
|
jaroslav@1646
|
504 |
/*non-public*/ static long staticOffset(Object accessorObj) {
|
jaroslav@1646
|
505 |
return ((StaticAccessor)accessorObj).staticOffset;
|
jaroslav@1646
|
506 |
}
|
jaroslav@1646
|
507 |
|
jaroslav@1646
|
508 |
@ForceInline
|
jaroslav@1646
|
509 |
/*non-public*/ static Object checkCast(Object mh, Object obj) {
|
jaroslav@1646
|
510 |
return ((DirectMethodHandle) mh).checkCast(obj);
|
jaroslav@1646
|
511 |
}
|
jaroslav@1646
|
512 |
|
jaroslav@1646
|
513 |
Object checkCast(Object obj) {
|
jaroslav@1646
|
514 |
return member.getReturnType().cast(obj);
|
jaroslav@1646
|
515 |
}
|
jaroslav@1646
|
516 |
|
jaroslav@1646
|
517 |
// Caching machinery for field accessors:
|
jaroslav@1646
|
518 |
private static byte
|
jaroslav@1646
|
519 |
AF_GETFIELD = 0,
|
jaroslav@1646
|
520 |
AF_PUTFIELD = 1,
|
jaroslav@1646
|
521 |
AF_GETSTATIC = 2,
|
jaroslav@1646
|
522 |
AF_PUTSTATIC = 3,
|
jaroslav@1646
|
523 |
AF_GETSTATIC_INIT = 4,
|
jaroslav@1646
|
524 |
AF_PUTSTATIC_INIT = 5,
|
jaroslav@1646
|
525 |
AF_LIMIT = 6;
|
jaroslav@1646
|
526 |
// Enumerate the different field kinds using Wrapper,
|
jaroslav@1646
|
527 |
// with an extra case added for checked references.
|
jaroslav@1646
|
528 |
private static int
|
jaroslav@1646
|
529 |
FT_LAST_WRAPPER = Wrapper.values().length-1,
|
jaroslav@1646
|
530 |
FT_UNCHECKED_REF = Wrapper.OBJECT.ordinal(),
|
jaroslav@1646
|
531 |
FT_CHECKED_REF = FT_LAST_WRAPPER+1,
|
jaroslav@1646
|
532 |
FT_LIMIT = FT_LAST_WRAPPER+2;
|
jaroslav@1646
|
533 |
private static int afIndex(byte formOp, boolean isVolatile, int ftypeKind) {
|
jaroslav@1646
|
534 |
return ((formOp * FT_LIMIT * 2)
|
jaroslav@1646
|
535 |
+ (isVolatile ? FT_LIMIT : 0)
|
jaroslav@1646
|
536 |
+ ftypeKind);
|
jaroslav@1646
|
537 |
}
|
jaroslav@1646
|
538 |
private static final LambdaForm[] ACCESSOR_FORMS
|
jaroslav@1646
|
539 |
= new LambdaForm[afIndex(AF_LIMIT, false, 0)];
|
jaroslav@1646
|
540 |
private static int ftypeKind(Class<?> ftype) {
|
jaroslav@1646
|
541 |
if (ftype.isPrimitive())
|
jaroslav@1646
|
542 |
return Wrapper.forPrimitiveType(ftype).ordinal();
|
jaroslav@1646
|
543 |
else if (VerifyType.isNullReferenceConversion(Object.class, ftype))
|
jaroslav@1646
|
544 |
return FT_UNCHECKED_REF;
|
jaroslav@1646
|
545 |
else
|
jaroslav@1646
|
546 |
return FT_CHECKED_REF;
|
jaroslav@1646
|
547 |
}
|
jaroslav@1646
|
548 |
|
jaroslav@1646
|
549 |
/**
|
jaroslav@1646
|
550 |
* Create a LF which can access the given field.
|
jaroslav@1646
|
551 |
* Cache and share this structure among all fields with
|
jaroslav@1646
|
552 |
* the same basicType and refKind.
|
jaroslav@1646
|
553 |
*/
|
jaroslav@1646
|
554 |
private static LambdaForm preparedFieldLambdaForm(MemberName m) {
|
jaroslav@1646
|
555 |
Class<?> ftype = m.getFieldType();
|
jaroslav@1646
|
556 |
boolean isVolatile = m.isVolatile();
|
jaroslav@1646
|
557 |
byte formOp;
|
jaroslav@1646
|
558 |
switch (m.getReferenceKind()) {
|
jaroslav@1646
|
559 |
case REF_getField: formOp = AF_GETFIELD; break;
|
jaroslav@1646
|
560 |
case REF_putField: formOp = AF_PUTFIELD; break;
|
jaroslav@1646
|
561 |
case REF_getStatic: formOp = AF_GETSTATIC; break;
|
jaroslav@1646
|
562 |
case REF_putStatic: formOp = AF_PUTSTATIC; break;
|
jaroslav@1646
|
563 |
default: throw new InternalError(m.toString());
|
jaroslav@1646
|
564 |
}
|
jaroslav@1646
|
565 |
if (shouldBeInitialized(m)) {
|
jaroslav@1646
|
566 |
// precompute the barrier-free version:
|
jaroslav@1646
|
567 |
preparedFieldLambdaForm(formOp, isVolatile, ftype);
|
jaroslav@1646
|
568 |
assert((AF_GETSTATIC_INIT - AF_GETSTATIC) ==
|
jaroslav@1646
|
569 |
(AF_PUTSTATIC_INIT - AF_PUTSTATIC));
|
jaroslav@1646
|
570 |
formOp += (AF_GETSTATIC_INIT - AF_GETSTATIC);
|
jaroslav@1646
|
571 |
}
|
jaroslav@1646
|
572 |
LambdaForm lform = preparedFieldLambdaForm(formOp, isVolatile, ftype);
|
jaroslav@1646
|
573 |
maybeCompile(lform, m);
|
jaroslav@1646
|
574 |
assert(lform.methodType().dropParameterTypes(0, 1)
|
jaroslav@1646
|
575 |
.equals(m.getInvocationType().basicType()))
|
jaroslav@1646
|
576 |
: Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());
|
jaroslav@1646
|
577 |
return lform;
|
jaroslav@1646
|
578 |
}
|
jaroslav@1646
|
579 |
private static LambdaForm preparedFieldLambdaForm(byte formOp, boolean isVolatile, Class<?> ftype) {
|
jaroslav@1646
|
580 |
int afIndex = afIndex(formOp, isVolatile, ftypeKind(ftype));
|
jaroslav@1646
|
581 |
LambdaForm lform = ACCESSOR_FORMS[afIndex];
|
jaroslav@1646
|
582 |
if (lform != null) return lform;
|
jaroslav@1646
|
583 |
lform = makePreparedFieldLambdaForm(formOp, isVolatile, ftypeKind(ftype));
|
jaroslav@1646
|
584 |
ACCESSOR_FORMS[afIndex] = lform; // don't bother with a CAS
|
jaroslav@1646
|
585 |
return lform;
|
jaroslav@1646
|
586 |
}
|
jaroslav@1646
|
587 |
|
jaroslav@1646
|
588 |
private static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {
|
jaroslav@1646
|
589 |
boolean isGetter = (formOp & 1) == (AF_GETFIELD & 1);
|
jaroslav@1646
|
590 |
boolean isStatic = (formOp >= AF_GETSTATIC);
|
jaroslav@1646
|
591 |
boolean needsInit = (formOp >= AF_GETSTATIC_INIT);
|
jaroslav@1646
|
592 |
boolean needsCast = (ftypeKind == FT_CHECKED_REF);
|
jaroslav@1646
|
593 |
Wrapper fw = (needsCast ? Wrapper.OBJECT : Wrapper.values()[ftypeKind]);
|
jaroslav@1646
|
594 |
Class<?> ft = fw.primitiveType();
|
jaroslav@1646
|
595 |
assert(ftypeKind(needsCast ? String.class : ft) == ftypeKind);
|
jaroslav@1646
|
596 |
String tname = fw.primitiveSimpleName();
|
jaroslav@1646
|
597 |
String ctname = Character.toUpperCase(tname.charAt(0)) + tname.substring(1);
|
jaroslav@1646
|
598 |
if (isVolatile) ctname += "Volatile";
|
jaroslav@1646
|
599 |
String getOrPut = (isGetter ? "get" : "put");
|
jaroslav@1646
|
600 |
String linkerName = (getOrPut + ctname); // getObject, putIntVolatile, etc.
|
jaroslav@1646
|
601 |
MethodType linkerType;
|
jaroslav@1646
|
602 |
if (isGetter)
|
jaroslav@1646
|
603 |
linkerType = MethodType.methodType(ft, Object.class, long.class);
|
jaroslav@1646
|
604 |
else
|
jaroslav@1646
|
605 |
linkerType = MethodType.methodType(void.class, Object.class, long.class, ft);
|
jaroslav@1646
|
606 |
MemberName linker = new MemberName(Unsafe.class, linkerName, linkerType, REF_invokeVirtual);
|
jaroslav@1646
|
607 |
try {
|
jaroslav@1646
|
608 |
linker = IMPL_NAMES.resolveOrFail(REF_invokeVirtual, linker, null, NoSuchMethodException.class);
|
jaroslav@1646
|
609 |
} catch (ReflectiveOperationException ex) {
|
jaroslav@1646
|
610 |
throw newInternalError(ex);
|
jaroslav@1646
|
611 |
}
|
jaroslav@1646
|
612 |
|
jaroslav@1646
|
613 |
// What is the external type of the lambda form?
|
jaroslav@1646
|
614 |
MethodType mtype;
|
jaroslav@1646
|
615 |
if (isGetter)
|
jaroslav@1646
|
616 |
mtype = MethodType.methodType(ft);
|
jaroslav@1646
|
617 |
else
|
jaroslav@1646
|
618 |
mtype = MethodType.methodType(void.class, ft);
|
jaroslav@1646
|
619 |
mtype = mtype.basicType(); // erase short to int, etc.
|
jaroslav@1646
|
620 |
if (!isStatic)
|
jaroslav@1646
|
621 |
mtype = mtype.insertParameterTypes(0, Object.class);
|
jaroslav@1646
|
622 |
final int DMH_THIS = 0;
|
jaroslav@1646
|
623 |
final int ARG_BASE = 1;
|
jaroslav@1646
|
624 |
final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
|
jaroslav@1646
|
625 |
// if this is for non-static access, the base pointer is stored at this index:
|
jaroslav@1646
|
626 |
final int OBJ_BASE = isStatic ? -1 : ARG_BASE;
|
jaroslav@1646
|
627 |
// if this is for write access, the value to be written is stored at this index:
|
jaroslav@1646
|
628 |
final int SET_VALUE = isGetter ? -1 : ARG_LIMIT - 1;
|
jaroslav@1646
|
629 |
int nameCursor = ARG_LIMIT;
|
jaroslav@1646
|
630 |
final int F_HOLDER = (isStatic ? nameCursor++ : -1); // static base if any
|
jaroslav@1646
|
631 |
final int F_OFFSET = nameCursor++; // Either static offset or field offset.
|
jaroslav@1646
|
632 |
final int OBJ_CHECK = (OBJ_BASE >= 0 ? nameCursor++ : -1);
|
jaroslav@1646
|
633 |
final int INIT_BAR = (needsInit ? nameCursor++ : -1);
|
jaroslav@1646
|
634 |
final int PRE_CAST = (needsCast && !isGetter ? nameCursor++ : -1);
|
jaroslav@1646
|
635 |
final int LINKER_CALL = nameCursor++;
|
jaroslav@1646
|
636 |
final int POST_CAST = (needsCast && isGetter ? nameCursor++ : -1);
|
jaroslav@1646
|
637 |
final int RESULT = nameCursor-1; // either the call or the cast
|
jaroslav@1646
|
638 |
Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
|
jaroslav@1646
|
639 |
if (needsInit)
|
jaroslav@1646
|
640 |
names[INIT_BAR] = new Name(Lazy.NF_ensureInitialized, names[DMH_THIS]);
|
jaroslav@1646
|
641 |
if (needsCast && !isGetter)
|
jaroslav@1646
|
642 |
names[PRE_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[SET_VALUE]);
|
jaroslav@1646
|
643 |
Object[] outArgs = new Object[1 + linkerType.parameterCount()];
|
jaroslav@1646
|
644 |
assert(outArgs.length == (isGetter ? 3 : 4));
|
jaroslav@1646
|
645 |
outArgs[0] = UNSAFE;
|
jaroslav@1646
|
646 |
if (isStatic) {
|
jaroslav@1646
|
647 |
outArgs[1] = names[F_HOLDER] = new Name(Lazy.NF_staticBase, names[DMH_THIS]);
|
jaroslav@1646
|
648 |
outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_staticOffset, names[DMH_THIS]);
|
jaroslav@1646
|
649 |
} else {
|
jaroslav@1646
|
650 |
outArgs[1] = names[OBJ_CHECK] = new Name(Lazy.NF_checkBase, names[OBJ_BASE]);
|
jaroslav@1646
|
651 |
outArgs[2] = names[F_OFFSET] = new Name(Lazy.NF_fieldOffset, names[DMH_THIS]);
|
jaroslav@1646
|
652 |
}
|
jaroslav@1646
|
653 |
if (!isGetter) {
|
jaroslav@1646
|
654 |
outArgs[3] = (needsCast ? names[PRE_CAST] : names[SET_VALUE]);
|
jaroslav@1646
|
655 |
}
|
jaroslav@1646
|
656 |
for (Object a : outArgs) assert(a != null);
|
jaroslav@1646
|
657 |
names[LINKER_CALL] = new Name(linker, outArgs);
|
jaroslav@1646
|
658 |
if (needsCast && isGetter)
|
jaroslav@1646
|
659 |
names[POST_CAST] = new Name(Lazy.NF_checkCast, names[DMH_THIS], names[LINKER_CALL]);
|
jaroslav@1646
|
660 |
for (Name n : names) assert(n != null);
|
jaroslav@1646
|
661 |
String fieldOrStatic = (isStatic ? "Static" : "Field");
|
jaroslav@1646
|
662 |
String lambdaName = (linkerName + fieldOrStatic); // significant only for debugging
|
jaroslav@1646
|
663 |
if (needsCast) lambdaName += "Cast";
|
jaroslav@1646
|
664 |
if (needsInit) lambdaName += "Init";
|
jaroslav@1646
|
665 |
return new LambdaForm(lambdaName, ARG_LIMIT, names, RESULT);
|
jaroslav@1646
|
666 |
}
|
jaroslav@1646
|
667 |
|
jaroslav@1646
|
668 |
/**
|
jaroslav@1646
|
669 |
* Pre-initialized NamedFunctions for bootstrapping purposes.
|
jaroslav@1646
|
670 |
* Factored in an inner class to delay initialization until first usage.
|
jaroslav@1646
|
671 |
*/
|
jaroslav@1646
|
672 |
private static class Lazy {
|
jaroslav@1646
|
673 |
static final NamedFunction
|
jaroslav@1646
|
674 |
NF_internalMemberName,
|
jaroslav@1646
|
675 |
NF_internalMemberNameEnsureInit,
|
jaroslav@1646
|
676 |
NF_ensureInitialized,
|
jaroslav@1646
|
677 |
NF_fieldOffset,
|
jaroslav@1646
|
678 |
NF_checkBase,
|
jaroslav@1646
|
679 |
NF_staticBase,
|
jaroslav@1646
|
680 |
NF_staticOffset,
|
jaroslav@1646
|
681 |
NF_checkCast,
|
jaroslav@1646
|
682 |
NF_allocateInstance,
|
jaroslav@1646
|
683 |
NF_constructorMethod;
|
jaroslav@1646
|
684 |
static {
|
jaroslav@1646
|
685 |
try {
|
jaroslav@1646
|
686 |
NamedFunction nfs[] = {
|
jaroslav@1646
|
687 |
NF_internalMemberName = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
688 |
.getDeclaredMethod("internalMemberName", Object.class)),
|
jaroslav@1646
|
689 |
NF_internalMemberNameEnsureInit = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
690 |
.getDeclaredMethod("internalMemberNameEnsureInit", Object.class)),
|
jaroslav@1646
|
691 |
NF_ensureInitialized = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
692 |
.getDeclaredMethod("ensureInitialized", Object.class)),
|
jaroslav@1646
|
693 |
NF_fieldOffset = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
694 |
.getDeclaredMethod("fieldOffset", Object.class)),
|
jaroslav@1646
|
695 |
NF_checkBase = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
696 |
.getDeclaredMethod("checkBase", Object.class)),
|
jaroslav@1646
|
697 |
NF_staticBase = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
698 |
.getDeclaredMethod("staticBase", Object.class)),
|
jaroslav@1646
|
699 |
NF_staticOffset = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
700 |
.getDeclaredMethod("staticOffset", Object.class)),
|
jaroslav@1646
|
701 |
NF_checkCast = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
702 |
.getDeclaredMethod("checkCast", Object.class, Object.class)),
|
jaroslav@1646
|
703 |
NF_allocateInstance = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
704 |
.getDeclaredMethod("allocateInstance", Object.class)),
|
jaroslav@1646
|
705 |
NF_constructorMethod = new NamedFunction(DirectMethodHandle.class
|
jaroslav@1646
|
706 |
.getDeclaredMethod("constructorMethod", Object.class))
|
jaroslav@1646
|
707 |
};
|
jaroslav@1646
|
708 |
for (NamedFunction nf : nfs) {
|
jaroslav@1646
|
709 |
// Each nf must be statically invocable or we get tied up in our bootstraps.
|
jaroslav@1646
|
710 |
assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf.member)) : nf;
|
jaroslav@1646
|
711 |
nf.resolve();
|
jaroslav@1646
|
712 |
}
|
jaroslav@1646
|
713 |
} catch (ReflectiveOperationException ex) {
|
jaroslav@1646
|
714 |
throw newInternalError(ex);
|
jaroslav@1646
|
715 |
}
|
jaroslav@1646
|
716 |
}
|
jaroslav@1646
|
717 |
}
|
jaroslav@1646
|
718 |
}
|