d05ed512ac
Co-authored-by: Vladimir Ivanov <vladimir.x.ivanov@oracle.com> Co-authored-by: Tobias Hartmann <tobias.hartmann@oracle.com> Reviewed-by: acorn, vlivanov, dholmes
888 lines
38 KiB
Java
888 lines
38 KiB
Java
/*
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* Copyright (c) 2008, 2018, 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 jdk.internal.misc.Unsafe;
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import jdk.internal.vm.annotation.ForceInline;
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import jdk.internal.vm.annotation.Stable;
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import sun.invoke.util.ValueConversions;
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import sun.invoke.util.VerifyAccess;
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import sun.invoke.util.VerifyType;
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import sun.invoke.util.Wrapper;
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import java.lang.ref.WeakReference;
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import java.util.Arrays;
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import java.util.Objects;
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import static java.lang.invoke.LambdaForm.*;
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import static java.lang.invoke.LambdaForm.Kind.*;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandleStatics.UNSAFE;
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import static java.lang.invoke.MethodHandleStatics.newInternalError;
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import static java.lang.invoke.MethodTypeForm.*;
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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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assert(member.getReferenceKind() == m.getReferenceKind()); // else this.form is wrong
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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<?> refc, MemberName member, Class<?> callerClass) {
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MethodType mtype = member.getMethodOrFieldType();
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if (!member.isStatic()) {
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if (!member.getDeclaringClass().isAssignableFrom(refc) || member.isConstructor())
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throw new InternalError(member.toString());
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mtype = mtype.insertParameterTypes(0, refc);
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}
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if (!member.isField()) {
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switch (refKind) {
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case REF_invokeSpecial: {
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member = member.asSpecial();
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LambdaForm lform = preparedLambdaForm(member, callerClass);
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Class<?> checkClass = refc; // Class to use for receiver type check
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if (callerClass != null) {
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checkClass = callerClass; // potentially strengthen to caller class
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}
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return new Special(mtype, lform, member, checkClass);
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}
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case REF_invokeInterface: {
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LambdaForm lform = preparedLambdaForm(member, callerClass);
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return new Interface(mtype, lform, member, refc);
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}
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default: {
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LambdaForm lform = preparedLambdaForm(member, callerClass);
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return new DirectMethodHandle(mtype, lform, member);
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}
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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<?> refc, 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, refc, member, null /* no callerClass context */);
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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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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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BoundMethodHandle rebind() {
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return BoundMethodHandle.makeReinvoker(this);
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}
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@Override
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MethodHandle copyWith(MethodType mt, LambdaForm lf) {
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assert(this.getClass() == DirectMethodHandle.class); // must override in subclasses
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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 "\n& DMH.MN="+internalMemberName();
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}
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//// Implementation methods.
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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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private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory();
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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, Class<?> callerClass) {
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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()) : 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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if (which == LF_INVSPECIAL && callerClass != null && callerClass.isInterface()) {
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which = LF_INVSPECIAL_IFC;
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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(MemberName m) {
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return preparedLambdaForm(m, null);
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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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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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boolean needsReceiverCheck = (which == LF_INVINTERFACE ||
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which == LF_INVSPECIAL_IFC);
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String linkerName;
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LambdaForm.Kind kind;
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switch (which) {
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case LF_INVVIRTUAL: linkerName = "linkToVirtual"; kind = DIRECT_INVOKE_VIRTUAL; break;
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case LF_INVSTATIC: linkerName = "linkToStatic"; kind = DIRECT_INVOKE_STATIC; break;
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case LF_INVSTATIC_INIT:linkerName = "linkToStatic"; kind = DIRECT_INVOKE_STATIC_INIT; break;
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case LF_INVSPECIAL_IFC:linkerName = "linkToSpecial"; kind = DIRECT_INVOKE_SPECIAL_IFC; break;
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case LF_INVSPECIAL: linkerName = "linkToSpecial"; kind = DIRECT_INVOKE_SPECIAL; break;
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case LF_INVINTERFACE: linkerName = "linkToInterface"; kind = DIRECT_INVOKE_INTERFACE; break;
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case LF_NEWINVSPECIAL: linkerName = "linkToSpecial"; kind = DIRECT_NEW_INVOKE_SPECIAL; 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 CHECK_RECEIVER = (needsReceiverCheck ? nameCursor++ : -1);
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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(getFunction(NF_allocateInstance), names[DMH_THIS]);
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names[GET_MEMBER] = new Name(getFunction(NF_constructorMethod), names[DMH_THIS]);
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} else if (needsInit) {
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names[GET_MEMBER] = new Name(getFunction(NF_internalMemberNameEnsureInit), names[DMH_THIS]);
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} else {
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names[GET_MEMBER] = new Name(getFunction(NF_internalMemberName), names[DMH_THIS]);
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}
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assert(findDirectMethodHandle(names[GET_MEMBER]) == names[DMH_THIS]);
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Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, GET_MEMBER+1, Object[].class);
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if (needsReceiverCheck) {
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names[CHECK_RECEIVER] = new Name(getFunction(NF_checkReceiver), names[DMH_THIS], names[ARG_BASE]);
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outArgs[0] = names[CHECK_RECEIVER];
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}
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assert(outArgs[outArgs.length-1] == names[GET_MEMBER]); // look, shifted args!
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int result = 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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LambdaForm lform = new LambdaForm(ARG_LIMIT, names, result, kind);
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// This is a tricky bit of code. Don't send it through the LF interpreter.
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lform.compileToBytecode();
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return lform;
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}
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/* assert */ static Object findDirectMethodHandle(Name name) {
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if (name.function.equals(getFunction(NF_internalMemberName)) ||
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name.function.equals(getFunction(NF_internalMemberNameEnsureInit)) ||
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name.function.equals(getFunction(NF_constructorMethod))) {
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assert(name.arguments.length == 1);
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return name.arguments[0];
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}
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return null;
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}
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private static void maybeCompile(LambdaForm lform, MemberName m) {
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if (lform.vmentry == null && VerifyAccess.isSamePackage(m.getDeclaringClass(), MethodHandle.class))
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// Help along bootstrapping...
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lform.compileToBytecode();
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}
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/** Static wrapper for DirectMethodHandle.internalMemberName. */
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@ForceInline
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/*non-public*/ static Object internalMemberName(Object mh) {
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return ((DirectMethodHandle)mh).member;
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}
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/** Static wrapper for DirectMethodHandle.internalMemberName.
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* This one also forces initialization.
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*/
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/*non-public*/ static Object internalMemberNameEnsureInit(Object mh) {
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DirectMethodHandle dmh = (DirectMethodHandle)mh;
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dmh.ensureInitialized();
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return dmh.member;
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}
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/*non-public*/ static
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boolean shouldBeInitialized(MemberName member) {
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switch (member.getReferenceKind()) {
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case REF_invokeStatic:
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case REF_getStatic:
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case REF_putStatic:
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case REF_newInvokeSpecial:
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break;
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default:
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// No need to initialize the class on this kind of member.
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return false;
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}
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Class<?> cls = member.getDeclaringClass();
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if (cls == ValueConversions.class ||
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cls == MethodHandleImpl.class ||
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cls == Invokers.class) {
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// These guys have lots of <clinit> DMH creation but we know
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// the MHs will not be used until the system is booted.
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return false;
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}
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if (VerifyAccess.isSamePackage(MethodHandle.class, cls) ||
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VerifyAccess.isSamePackage(ValueConversions.class, cls)) {
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// It is a system class. It is probably in the process of
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// being initialized, but we will help it along just to be safe.
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if (UNSAFE.shouldBeInitialized(cls)) {
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UNSAFE.ensureClassInitialized(cls);
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}
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return false;
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}
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return UNSAFE.shouldBeInitialized(cls);
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}
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private static class EnsureInitialized extends ClassValue<WeakReference<Thread>> {
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@Override
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protected WeakReference<Thread> computeValue(Class<?> type) {
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UNSAFE.ensureClassInitialized(type);
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if (UNSAFE.shouldBeInitialized(type))
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// If the previous call didn't block, this can happen.
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// We are executing inside <clinit>.
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return new WeakReference<>(Thread.currentThread());
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return null;
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}
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static final EnsureInitialized INSTANCE = new EnsureInitialized();
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}
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private void ensureInitialized() {
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if (checkInitialized(member)) {
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// The coast is clear. Delete the <clinit> barrier.
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if (member.isField())
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updateForm(preparedFieldLambdaForm(member));
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else
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updateForm(preparedLambdaForm(member));
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}
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}
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private static boolean checkInitialized(MemberName member) {
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Class<?> defc = member.getDeclaringClass();
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WeakReference<Thread> ref = EnsureInitialized.INSTANCE.get(defc);
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if (ref == null) {
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return true; // the final state
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}
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Thread clinitThread = ref.get();
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// Somebody may still be running defc.<clinit>.
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if (clinitThread == Thread.currentThread()) {
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// If anybody is running defc.<clinit>, it is this thread.
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if (UNSAFE.shouldBeInitialized(defc))
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// Yes, we are running it; keep the barrier for now.
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return false;
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} else {
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// We are in a random thread. Block.
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UNSAFE.ensureClassInitialized(defc);
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}
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assert(!UNSAFE.shouldBeInitialized(defc));
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// put it into the final state
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EnsureInitialized.INSTANCE.remove(defc);
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return true;
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}
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/*non-public*/ static void ensureInitialized(Object mh) {
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((DirectMethodHandle)mh).ensureInitialized();
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}
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/** This subclass represents invokespecial instructions. */
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static class Special extends DirectMethodHandle {
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private final Class<?> caller;
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private Special(MethodType mtype, LambdaForm form, MemberName member, Class<?> caller) {
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super(mtype, form, member);
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this.caller = caller;
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}
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@Override
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boolean isInvokeSpecial() {
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return true;
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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 Special(mt, lf, member, caller);
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}
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Object checkReceiver(Object recv) {
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if (!caller.isInstance(recv)) {
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String msg = String.format("Receiver class %s is not a subclass of caller class %s",
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recv.getClass().getName(), caller.getName());
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throw new IncompatibleClassChangeError(msg);
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}
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return recv;
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}
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}
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/** This subclass represents invokeinterface instructions. */
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static class Interface extends DirectMethodHandle {
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private final Class<?> refc;
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private Interface(MethodType mtype, LambdaForm form, MemberName member, Class<?> refc) {
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super(mtype, form, member);
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assert refc.isInterface() : refc;
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this.refc = refc;
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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 Interface(mt, lf, member, refc);
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}
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@Override
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Object checkReceiver(Object recv) {
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if (!refc.isInstance(recv)) {
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String msg = String.format("Receiver class %s does not implement the requested interface %s",
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recv.getClass().getName(), refc.getName());
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throw new IncompatibleClassChangeError(msg);
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}
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return recv;
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}
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}
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/** Used for interface receiver type checks, by Interface and Special modes. */
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Object checkReceiver(Object recv) {
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throw new InternalError("Should only be invoked on a subclass");
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}
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/** This subclass handles constructor references. */
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static class Constructor extends DirectMethodHandle {
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final MemberName initMethod;
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final Class<?> instanceClass;
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private Constructor(MethodType mtype, LambdaForm form, MemberName constructor,
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MemberName initMethod, Class<?> instanceClass) {
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super(mtype, form, constructor);
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this.initMethod = initMethod;
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this.instanceClass = instanceClass;
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assert(initMethod.isResolved());
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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 Constructor(mt, lf, member, initMethod, instanceClass);
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}
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}
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/*non-public*/ static Object constructorMethod(Object mh) {
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|
Constructor dmh = (Constructor)mh;
|
|
return dmh.initMethod;
|
|
}
|
|
|
|
/*non-public*/ static Object allocateInstance(Object mh) throws InstantiationException {
|
|
Constructor dmh = (Constructor)mh;
|
|
return UNSAFE.allocateInstance(dmh.instanceClass);
|
|
}
|
|
|
|
/** This subclass handles non-static field references. */
|
|
static class Accessor extends DirectMethodHandle {
|
|
final Class<?> fieldType;
|
|
final int fieldOffset;
|
|
private Accessor(MethodType mtype, LambdaForm form, MemberName member,
|
|
int fieldOffset) {
|
|
super(mtype, form, member);
|
|
this.fieldType = member.getFieldType();
|
|
this.fieldOffset = fieldOffset;
|
|
}
|
|
|
|
@Override Object checkCast(Object obj) {
|
|
return fieldType.cast(obj);
|
|
}
|
|
@Override
|
|
MethodHandle copyWith(MethodType mt, LambdaForm lf) {
|
|
return new Accessor(mt, lf, member, fieldOffset);
|
|
}
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static long fieldOffset(Object accessorObj) {
|
|
// Note: We return a long because that is what Unsafe.getObject likes.
|
|
// We store a plain int because it is more compact.
|
|
return ((Accessor)accessorObj).fieldOffset;
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static Object checkBase(Object obj) {
|
|
// Note that the object's class has already been verified,
|
|
// since the parameter type of the Accessor method handle
|
|
// is either member.getDeclaringClass or a subclass.
|
|
// This was verified in DirectMethodHandle.make.
|
|
// Therefore, the only remaining check is for null.
|
|
// Since this check is *not* guaranteed by Unsafe.getInt
|
|
// and its siblings, we need to make an explicit one here.
|
|
return Objects.requireNonNull(obj);
|
|
}
|
|
|
|
/** This subclass handles static field references. */
|
|
static class StaticAccessor extends DirectMethodHandle {
|
|
private final Class<?> fieldType;
|
|
private final Object staticBase;
|
|
private final long staticOffset;
|
|
|
|
private StaticAccessor(MethodType mtype, LambdaForm form, MemberName member,
|
|
Object staticBase, long staticOffset) {
|
|
super(mtype, form, member);
|
|
this.fieldType = member.getFieldType();
|
|
this.staticBase = staticBase;
|
|
this.staticOffset = staticOffset;
|
|
}
|
|
|
|
@Override Object checkCast(Object obj) {
|
|
return fieldType.cast(obj);
|
|
}
|
|
@Override
|
|
MethodHandle copyWith(MethodType mt, LambdaForm lf) {
|
|
return new StaticAccessor(mt, lf, member, staticBase, staticOffset);
|
|
}
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static Object nullCheck(Object obj) {
|
|
return Objects.requireNonNull(obj);
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static Object staticBase(Object accessorObj) {
|
|
return ((StaticAccessor)accessorObj).staticBase;
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static long staticOffset(Object accessorObj) {
|
|
return ((StaticAccessor)accessorObj).staticOffset;
|
|
}
|
|
|
|
@ForceInline
|
|
/*non-public*/ static Object checkCast(Object mh, Object obj) {
|
|
return ((DirectMethodHandle) mh).checkCast(obj);
|
|
}
|
|
|
|
Object checkCast(Object obj) {
|
|
return member.getReturnType().cast(obj);
|
|
}
|
|
|
|
// Caching machinery for field accessors:
|
|
static final byte
|
|
AF_GETFIELD = 0,
|
|
AF_PUTFIELD = 1,
|
|
AF_GETSTATIC = 2,
|
|
AF_PUTSTATIC = 3,
|
|
AF_GETSTATIC_INIT = 4,
|
|
AF_PUTSTATIC_INIT = 5,
|
|
AF_LIMIT = 6;
|
|
// Enumerate the different field kinds using Wrapper,
|
|
// with an extra case added for checked references.
|
|
static final int
|
|
FT_LAST_WRAPPER = Wrapper.COUNT-1,
|
|
FT_UNCHECKED_REF = Wrapper.OBJECT.ordinal(),
|
|
FT_CHECKED_REF = FT_LAST_WRAPPER+1,
|
|
FT_LIMIT = FT_LAST_WRAPPER+2;
|
|
private static int afIndex(byte formOp, boolean isVolatile, int ftypeKind) {
|
|
return ((formOp * FT_LIMIT * 2)
|
|
+ (isVolatile ? FT_LIMIT : 0)
|
|
+ ftypeKind);
|
|
}
|
|
@Stable
|
|
private static final LambdaForm[] ACCESSOR_FORMS
|
|
= new LambdaForm[afIndex(AF_LIMIT, false, 0)];
|
|
static int ftypeKind(Class<?> ftype) {
|
|
if (ftype.isPrimitive())
|
|
return Wrapper.forPrimitiveType(ftype).ordinal();
|
|
else if (VerifyType.isNullReferenceConversion(Object.class, ftype))
|
|
return FT_UNCHECKED_REF;
|
|
else
|
|
return FT_CHECKED_REF;
|
|
}
|
|
|
|
/**
|
|
* Create a LF which can access the given field.
|
|
* Cache and share this structure among all fields with
|
|
* the same basicType and refKind.
|
|
*/
|
|
private static LambdaForm preparedFieldLambdaForm(MemberName m) {
|
|
Class<?> ftype = m.getFieldType();
|
|
boolean isVolatile = m.isVolatile();
|
|
byte formOp;
|
|
switch (m.getReferenceKind()) {
|
|
case REF_getField: formOp = AF_GETFIELD; break;
|
|
case REF_putField: formOp = AF_PUTFIELD; break;
|
|
case REF_getStatic: formOp = AF_GETSTATIC; break;
|
|
case REF_putStatic: formOp = AF_PUTSTATIC; break;
|
|
default: throw new InternalError(m.toString());
|
|
}
|
|
if (shouldBeInitialized(m)) {
|
|
// precompute the barrier-free version:
|
|
preparedFieldLambdaForm(formOp, isVolatile, ftype);
|
|
assert((AF_GETSTATIC_INIT - AF_GETSTATIC) ==
|
|
(AF_PUTSTATIC_INIT - AF_PUTSTATIC));
|
|
formOp += (AF_GETSTATIC_INIT - AF_GETSTATIC);
|
|
}
|
|
LambdaForm lform = preparedFieldLambdaForm(formOp, isVolatile, ftype);
|
|
maybeCompile(lform, m);
|
|
assert(lform.methodType().dropParameterTypes(0, 1)
|
|
.equals(m.getInvocationType().basicType()))
|
|
: Arrays.asList(m, m.getInvocationType().basicType(), lform, lform.methodType());
|
|
return lform;
|
|
}
|
|
private static LambdaForm preparedFieldLambdaForm(byte formOp, boolean isVolatile, Class<?> ftype) {
|
|
int ftypeKind = ftypeKind(ftype);
|
|
int afIndex = afIndex(formOp, isVolatile, ftypeKind);
|
|
LambdaForm lform = ACCESSOR_FORMS[afIndex];
|
|
if (lform != null) return lform;
|
|
lform = makePreparedFieldLambdaForm(formOp, isVolatile, ftypeKind);
|
|
ACCESSOR_FORMS[afIndex] = lform; // don't bother with a CAS
|
|
return lform;
|
|
}
|
|
|
|
private static final Wrapper[] ALL_WRAPPERS = Wrapper.values();
|
|
|
|
private static Kind getFieldKind(boolean isGetter, boolean isVolatile, Wrapper wrapper) {
|
|
if (isGetter) {
|
|
if (isVolatile) {
|
|
switch (wrapper) {
|
|
case BOOLEAN: return GET_BOOLEAN_VOLATILE;
|
|
case BYTE: return GET_BYTE_VOLATILE;
|
|
case SHORT: return GET_SHORT_VOLATILE;
|
|
case CHAR: return GET_CHAR_VOLATILE;
|
|
case INT: return GET_INT_VOLATILE;
|
|
case LONG: return GET_LONG_VOLATILE;
|
|
case FLOAT: return GET_FLOAT_VOLATILE;
|
|
case DOUBLE: return GET_DOUBLE_VOLATILE;
|
|
case OBJECT: return GET_OBJECT_VOLATILE;
|
|
}
|
|
} else {
|
|
switch (wrapper) {
|
|
case BOOLEAN: return GET_BOOLEAN;
|
|
case BYTE: return GET_BYTE;
|
|
case SHORT: return GET_SHORT;
|
|
case CHAR: return GET_CHAR;
|
|
case INT: return GET_INT;
|
|
case LONG: return GET_LONG;
|
|
case FLOAT: return GET_FLOAT;
|
|
case DOUBLE: return GET_DOUBLE;
|
|
case OBJECT: return GET_OBJECT;
|
|
}
|
|
}
|
|
} else {
|
|
if (isVolatile) {
|
|
switch (wrapper) {
|
|
case BOOLEAN: return PUT_BOOLEAN_VOLATILE;
|
|
case BYTE: return PUT_BYTE_VOLATILE;
|
|
case SHORT: return PUT_SHORT_VOLATILE;
|
|
case CHAR: return PUT_CHAR_VOLATILE;
|
|
case INT: return PUT_INT_VOLATILE;
|
|
case LONG: return PUT_LONG_VOLATILE;
|
|
case FLOAT: return PUT_FLOAT_VOLATILE;
|
|
case DOUBLE: return PUT_DOUBLE_VOLATILE;
|
|
case OBJECT: return PUT_OBJECT_VOLATILE;
|
|
}
|
|
} else {
|
|
switch (wrapper) {
|
|
case BOOLEAN: return PUT_BOOLEAN;
|
|
case BYTE: return PUT_BYTE;
|
|
case SHORT: return PUT_SHORT;
|
|
case CHAR: return PUT_CHAR;
|
|
case INT: return PUT_INT;
|
|
case LONG: return PUT_LONG;
|
|
case FLOAT: return PUT_FLOAT;
|
|
case DOUBLE: return PUT_DOUBLE;
|
|
case OBJECT: return PUT_OBJECT;
|
|
}
|
|
}
|
|
}
|
|
throw new AssertionError("Invalid arguments");
|
|
}
|
|
|
|
static LambdaForm makePreparedFieldLambdaForm(byte formOp, boolean isVolatile, int ftypeKind) {
|
|
boolean isGetter = (formOp & 1) == (AF_GETFIELD & 1);
|
|
boolean isStatic = (formOp >= AF_GETSTATIC);
|
|
boolean needsInit = (formOp >= AF_GETSTATIC_INIT);
|
|
boolean needsCast = (ftypeKind == FT_CHECKED_REF);
|
|
Wrapper fw = (needsCast ? Wrapper.OBJECT : ALL_WRAPPERS[ftypeKind]);
|
|
Class<?> ft = fw.primitiveType();
|
|
assert(ftypeKind(needsCast ? String.class : ft) == ftypeKind);
|
|
|
|
// getObject, putIntVolatile, etc.
|
|
Kind kind = getFieldKind(isGetter, isVolatile, fw);
|
|
|
|
MethodType linkerType;
|
|
if (isGetter)
|
|
linkerType = MethodType.methodType(ft, Object.class, long.class);
|
|
else
|
|
linkerType = MethodType.methodType(void.class, Object.class, long.class, ft);
|
|
MemberName linker = new MemberName(Unsafe.class, kind.methodName, linkerType, REF_invokeVirtual);
|
|
try {
|
|
linker = IMPL_NAMES.resolveOrFail(REF_invokeVirtual, linker, null, NoSuchMethodException.class);
|
|
} catch (ReflectiveOperationException ex) {
|
|
throw newInternalError(ex);
|
|
}
|
|
|
|
// What is the external type of the lambda form?
|
|
MethodType mtype;
|
|
if (isGetter)
|
|
mtype = MethodType.methodType(ft);
|
|
else
|
|
mtype = MethodType.methodType(void.class, ft);
|
|
mtype = mtype.basicType(); // erase short to int, etc.
|
|
if (!isStatic)
|
|
mtype = mtype.insertParameterTypes(0, Object.class);
|
|
final int DMH_THIS = 0;
|
|
final int ARG_BASE = 1;
|
|
final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
|
|
// if this is for non-static access, the base pointer is stored at this index:
|
|
final int OBJ_BASE = isStatic ? -1 : ARG_BASE;
|
|
// if this is for write access, the value to be written is stored at this index:
|
|
final int SET_VALUE = isGetter ? -1 : ARG_LIMIT - 1;
|
|
int nameCursor = ARG_LIMIT;
|
|
final int F_HOLDER = (isStatic ? nameCursor++ : -1); // static base if any
|
|
final int F_OFFSET = nameCursor++; // Either static offset or field offset.
|
|
final int OBJ_CHECK = (OBJ_BASE >= 0 ? nameCursor++ : -1);
|
|
final int U_HOLDER = nameCursor++; // UNSAFE holder
|
|
final int INIT_BAR = (needsInit ? nameCursor++ : -1);
|
|
final int PRE_CAST = (needsCast && !isGetter ? nameCursor++ : -1);
|
|
final int LINKER_CALL = nameCursor++;
|
|
final int POST_CAST = (needsCast && isGetter ? nameCursor++ : -1);
|
|
final int RESULT = nameCursor-1; // either the call or the cast
|
|
Name[] names = arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
|
|
if (needsInit)
|
|
names[INIT_BAR] = new Name(getFunction(NF_ensureInitialized), names[DMH_THIS]);
|
|
if (needsCast && !isGetter)
|
|
names[PRE_CAST] = new Name(getFunction(NF_checkCast), names[DMH_THIS], names[SET_VALUE]);
|
|
Object[] outArgs = new Object[1 + linkerType.parameterCount()];
|
|
assert(outArgs.length == (isGetter ? 3 : 4));
|
|
outArgs[0] = names[U_HOLDER] = new Name(getFunction(NF_UNSAFE));
|
|
if (isStatic) {
|
|
outArgs[1] = names[F_HOLDER] = new Name(getFunction(NF_staticBase), names[DMH_THIS]);
|
|
outArgs[2] = names[F_OFFSET] = new Name(getFunction(NF_staticOffset), names[DMH_THIS]);
|
|
} else {
|
|
outArgs[1] = names[OBJ_CHECK] = new Name(getFunction(NF_checkBase), names[OBJ_BASE]);
|
|
outArgs[2] = names[F_OFFSET] = new Name(getFunction(NF_fieldOffset), names[DMH_THIS]);
|
|
}
|
|
if (!isGetter) {
|
|
outArgs[3] = (needsCast ? names[PRE_CAST] : names[SET_VALUE]);
|
|
}
|
|
for (Object a : outArgs) assert(a != null);
|
|
names[LINKER_CALL] = new Name(linker, outArgs);
|
|
if (needsCast && isGetter)
|
|
names[POST_CAST] = new Name(getFunction(NF_checkCast), names[DMH_THIS], names[LINKER_CALL]);
|
|
for (Name n : names) assert(n != null);
|
|
|
|
LambdaForm form;
|
|
if (needsCast || needsInit) {
|
|
// can't use the pre-generated form when casting and/or initializing
|
|
form = new LambdaForm(ARG_LIMIT, names, RESULT);
|
|
} else {
|
|
form = new LambdaForm(ARG_LIMIT, names, RESULT, kind);
|
|
}
|
|
|
|
if (LambdaForm.debugNames()) {
|
|
// add some detail to the lambdaForm debugname,
|
|
// significant only for debugging
|
|
StringBuilder nameBuilder = new StringBuilder(kind.methodName);
|
|
if (isStatic) {
|
|
nameBuilder.append("Static");
|
|
} else {
|
|
nameBuilder.append("Field");
|
|
}
|
|
if (needsCast) {
|
|
nameBuilder.append("Cast");
|
|
}
|
|
if (needsInit) {
|
|
nameBuilder.append("Init");
|
|
}
|
|
LambdaForm.associateWithDebugName(form, nameBuilder.toString());
|
|
}
|
|
return form;
|
|
}
|
|
|
|
/**
|
|
* Pre-initialized NamedFunctions for bootstrapping purposes.
|
|
*/
|
|
static final byte NF_internalMemberName = 0,
|
|
NF_internalMemberNameEnsureInit = 1,
|
|
NF_ensureInitialized = 2,
|
|
NF_fieldOffset = 3,
|
|
NF_checkBase = 4,
|
|
NF_staticBase = 5,
|
|
NF_staticOffset = 6,
|
|
NF_checkCast = 7,
|
|
NF_allocateInstance = 8,
|
|
NF_constructorMethod = 9,
|
|
NF_UNSAFE = 10,
|
|
NF_checkReceiver = 11,
|
|
NF_LIMIT = 12;
|
|
|
|
private static final @Stable NamedFunction[] NFS = new NamedFunction[NF_LIMIT];
|
|
|
|
private static NamedFunction getFunction(byte func) {
|
|
NamedFunction nf = NFS[func];
|
|
if (nf != null) {
|
|
return nf;
|
|
}
|
|
// Each nf must be statically invocable or we get tied up in our bootstraps.
|
|
nf = NFS[func] = createFunction(func);
|
|
assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf));
|
|
return nf;
|
|
}
|
|
|
|
private static final MethodType OBJ_OBJ_TYPE = MethodType.methodType(Object.class, Object.class);
|
|
|
|
private static final MethodType LONG_OBJ_TYPE = MethodType.methodType(long.class, Object.class);
|
|
|
|
private static NamedFunction createFunction(byte func) {
|
|
try {
|
|
switch (func) {
|
|
case NF_internalMemberName:
|
|
return getNamedFunction("internalMemberName", OBJ_OBJ_TYPE);
|
|
case NF_internalMemberNameEnsureInit:
|
|
return getNamedFunction("internalMemberNameEnsureInit", OBJ_OBJ_TYPE);
|
|
case NF_ensureInitialized:
|
|
return getNamedFunction("ensureInitialized", MethodType.methodType(void.class, Object.class));
|
|
case NF_fieldOffset:
|
|
return getNamedFunction("fieldOffset", LONG_OBJ_TYPE);
|
|
case NF_checkBase:
|
|
return getNamedFunction("checkBase", OBJ_OBJ_TYPE);
|
|
case NF_staticBase:
|
|
return getNamedFunction("staticBase", OBJ_OBJ_TYPE);
|
|
case NF_staticOffset:
|
|
return getNamedFunction("staticOffset", LONG_OBJ_TYPE);
|
|
case NF_checkCast:
|
|
return getNamedFunction("checkCast", MethodType.methodType(Object.class, Object.class, Object.class));
|
|
case NF_allocateInstance:
|
|
return getNamedFunction("allocateInstance", OBJ_OBJ_TYPE);
|
|
case NF_constructorMethod:
|
|
return getNamedFunction("constructorMethod", OBJ_OBJ_TYPE);
|
|
case NF_UNSAFE:
|
|
MemberName member = new MemberName(MethodHandleStatics.class, "UNSAFE", Unsafe.class, REF_getField);
|
|
return new NamedFunction(
|
|
MemberName.getFactory()
|
|
.resolveOrFail(REF_getField, member, DirectMethodHandle.class, NoSuchMethodException.class));
|
|
case NF_checkReceiver:
|
|
member = new MemberName(DirectMethodHandle.class, "checkReceiver", OBJ_OBJ_TYPE, REF_invokeVirtual);
|
|
return new NamedFunction(
|
|
MemberName.getFactory()
|
|
.resolveOrFail(REF_invokeVirtual, member, DirectMethodHandle.class, NoSuchMethodException.class));
|
|
default:
|
|
throw newInternalError("Unknown function: " + func);
|
|
}
|
|
} catch (ReflectiveOperationException ex) {
|
|
throw newInternalError(ex);
|
|
}
|
|
}
|
|
|
|
private static NamedFunction getNamedFunction(String name, MethodType type)
|
|
throws ReflectiveOperationException
|
|
{
|
|
MemberName member = new MemberName(DirectMethodHandle.class, name, type, REF_invokeStatic);
|
|
return new NamedFunction(
|
|
MemberName.getFactory()
|
|
.resolveOrFail(REF_invokeStatic, member, DirectMethodHandle.class, NoSuchMethodException.class));
|
|
}
|
|
|
|
static {
|
|
// The Holder class will contain pre-generated DirectMethodHandles resolved
|
|
// speculatively using MemberName.getFactory().resolveOrNull. However, that
|
|
// doesn't initialize the class, which subtly breaks inlining etc. By forcing
|
|
// initialization of the Holder class we avoid these issues.
|
|
UNSAFE.ensureClassInitialized(Holder.class);
|
|
}
|
|
|
|
/* Placeholder class for DirectMethodHandles generated ahead of time */
|
|
final class Holder {}
|
|
}
|