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8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson
parent
270fe13182
commit
3789983e89
56923 changed files with 3 additions and 15727 deletions
662
src/java.base/share/classes/java/lang/invoke/Invokers.java
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662
src/java.base/share/classes/java/lang/invoke/Invokers.java
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@ -0,0 +1,662 @@
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/*
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* Copyright (c) 2008, 2016, 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.vm.annotation.DontInline;
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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 java.lang.reflect.Array;
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import java.util.Arrays;
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import static java.lang.invoke.MethodHandleStatics.*;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
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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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/**
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* Construction and caching of often-used invokers.
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* @author jrose
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*/
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class Invokers {
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// exact type (sans leading target MH) for the outgoing call
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private final MethodType targetType;
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// Cached adapter information:
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private final @Stable MethodHandle[] invokers = new MethodHandle[INV_LIMIT];
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// Indexes into invokers:
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static final int
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INV_EXACT = 0, // MethodHandles.exactInvoker
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INV_GENERIC = 1, // MethodHandles.invoker (generic invocation)
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INV_BASIC = 2, // MethodHandles.basicInvoker
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INV_LIMIT = 3;
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/** Compute and cache information common to all collecting adapters
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* that implement members of the erasure-family of the given erased type.
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*/
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/*non-public*/ Invokers(MethodType targetType) {
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this.targetType = targetType;
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}
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/*non-public*/ MethodHandle exactInvoker() {
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MethodHandle invoker = cachedInvoker(INV_EXACT);
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if (invoker != null) return invoker;
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invoker = makeExactOrGeneralInvoker(true);
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return setCachedInvoker(INV_EXACT, invoker);
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}
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/*non-public*/ MethodHandle genericInvoker() {
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MethodHandle invoker = cachedInvoker(INV_GENERIC);
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if (invoker != null) return invoker;
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invoker = makeExactOrGeneralInvoker(false);
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return setCachedInvoker(INV_GENERIC, invoker);
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}
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/*non-public*/ MethodHandle basicInvoker() {
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MethodHandle invoker = cachedInvoker(INV_BASIC);
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if (invoker != null) return invoker;
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MethodType basicType = targetType.basicType();
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if (basicType != targetType) {
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// double cache; not used significantly
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return setCachedInvoker(INV_BASIC, basicType.invokers().basicInvoker());
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}
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invoker = basicType.form().cachedMethodHandle(MethodTypeForm.MH_BASIC_INV);
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if (invoker == null) {
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MemberName method = invokeBasicMethod(basicType);
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invoker = DirectMethodHandle.make(method);
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assert(checkInvoker(invoker));
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invoker = basicType.form().setCachedMethodHandle(MethodTypeForm.MH_BASIC_INV, invoker);
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}
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return setCachedInvoker(INV_BASIC, invoker);
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}
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/*non-public*/ MethodHandle varHandleMethodInvoker(VarHandle.AccessMode ak) {
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// TODO cache invoker
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return makeVarHandleMethodInvoker(ak, false);
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}
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/*non-public*/ MethodHandle varHandleMethodExactInvoker(VarHandle.AccessMode ak) {
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// TODO cache invoker
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return makeVarHandleMethodInvoker(ak, true);
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}
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private MethodHandle cachedInvoker(int idx) {
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return invokers[idx];
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}
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private synchronized MethodHandle setCachedInvoker(int idx, final MethodHandle invoker) {
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// Simulate a CAS, to avoid racy duplication of results.
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MethodHandle prev = invokers[idx];
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if (prev != null) return prev;
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return invokers[idx] = invoker;
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}
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private MethodHandle makeExactOrGeneralInvoker(boolean isExact) {
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MethodType mtype = targetType;
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MethodType invokerType = mtype.invokerType();
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int which = (isExact ? MethodTypeForm.LF_EX_INVOKER : MethodTypeForm.LF_GEN_INVOKER);
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LambdaForm lform = invokeHandleForm(mtype, false, which);
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MethodHandle invoker = BoundMethodHandle.bindSingle(invokerType, lform, mtype);
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String whichName = (isExact ? "invokeExact" : "invoke");
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invoker = invoker.withInternalMemberName(MemberName.makeMethodHandleInvoke(whichName, mtype), false);
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assert(checkInvoker(invoker));
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maybeCompileToBytecode(invoker);
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return invoker;
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}
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private MethodHandle makeVarHandleMethodInvoker(VarHandle.AccessMode ak, boolean isExact) {
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MethodType mtype = targetType;
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MethodType invokerType = mtype.insertParameterTypes(0, VarHandle.class);
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LambdaForm lform = varHandleMethodInvokerHandleForm(ak, mtype, isExact);
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VarHandle.AccessDescriptor ad = new VarHandle.AccessDescriptor(mtype, ak.at.ordinal(), ak.ordinal());
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MethodHandle invoker = BoundMethodHandle.bindSingle(invokerType, lform, ad);
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invoker = invoker.withInternalMemberName(MemberName.makeVarHandleMethodInvoke(ak.methodName(), mtype), false);
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assert(checkVarHandleInvoker(invoker));
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maybeCompileToBytecode(invoker);
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return invoker;
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}
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/** If the target type seems to be common enough, eagerly compile the invoker to bytecodes. */
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private void maybeCompileToBytecode(MethodHandle invoker) {
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final int EAGER_COMPILE_ARITY_LIMIT = 10;
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if (targetType == targetType.erase() &&
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targetType.parameterCount() < EAGER_COMPILE_ARITY_LIMIT) {
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invoker.form.compileToBytecode();
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}
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}
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// This next one is called from LambdaForm.NamedFunction.<init>.
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/*non-public*/ static MemberName invokeBasicMethod(MethodType basicType) {
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assert(basicType == basicType.basicType());
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try {
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//Lookup.findVirtual(MethodHandle.class, name, type);
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return IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, MethodHandle.class, "invokeBasic", basicType);
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} catch (ReflectiveOperationException ex) {
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throw newInternalError("JVM cannot find invoker for "+basicType, ex);
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}
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}
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private boolean checkInvoker(MethodHandle invoker) {
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assert(targetType.invokerType().equals(invoker.type()))
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: java.util.Arrays.asList(targetType, targetType.invokerType(), invoker);
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assert(invoker.internalMemberName() == null ||
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invoker.internalMemberName().getMethodType().equals(targetType));
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assert(!invoker.isVarargsCollector());
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return true;
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}
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private boolean checkVarHandleInvoker(MethodHandle invoker) {
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MethodType invokerType = targetType.insertParameterTypes(0, VarHandle.class);
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assert(invokerType.equals(invoker.type()))
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: java.util.Arrays.asList(targetType, invokerType, invoker);
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assert(invoker.internalMemberName() == null ||
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invoker.internalMemberName().getMethodType().equals(targetType));
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assert(!invoker.isVarargsCollector());
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return true;
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}
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/**
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* Find or create an invoker which passes unchanged a given number of arguments
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* and spreads the rest from a trailing array argument.
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* The invoker target type is the post-spread type {@code (TYPEOF(uarg*), TYPEOF(sarg*))=>RT}.
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* All the {@code sarg}s must have a common type {@code C}. (If there are none, {@code Object} is assumed.}
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* @param leadingArgCount the number of unchanged (non-spread) arguments
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* @return {@code invoker.invokeExact(mh, uarg*, C[]{sarg*}) := (RT)mh.invoke(uarg*, sarg*)}
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*/
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/*non-public*/ MethodHandle spreadInvoker(int leadingArgCount) {
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int spreadArgCount = targetType.parameterCount() - leadingArgCount;
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MethodType postSpreadType = targetType;
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Class<?> argArrayType = impliedRestargType(postSpreadType, leadingArgCount);
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if (postSpreadType.parameterSlotCount() <= MethodType.MAX_MH_INVOKER_ARITY) {
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return genericInvoker().asSpreader(argArrayType, spreadArgCount);
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}
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// Cannot build a generic invoker here of type ginvoker.invoke(mh, a*[254]).
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// Instead, factor sinvoker.invoke(mh, a) into ainvoker.invoke(filter(mh), a)
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// where filter(mh) == mh.asSpreader(Object[], spreadArgCount)
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MethodType preSpreadType = postSpreadType
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.replaceParameterTypes(leadingArgCount, postSpreadType.parameterCount(), argArrayType);
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MethodHandle arrayInvoker = MethodHandles.invoker(preSpreadType);
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MethodHandle makeSpreader = MethodHandles.insertArguments(Lazy.MH_asSpreader, 1, argArrayType, spreadArgCount);
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return MethodHandles.filterArgument(arrayInvoker, 0, makeSpreader);
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}
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private static Class<?> impliedRestargType(MethodType restargType, int fromPos) {
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if (restargType.isGeneric()) return Object[].class; // can be nothing else
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int maxPos = restargType.parameterCount();
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if (fromPos >= maxPos) return Object[].class; // reasonable default
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Class<?> argType = restargType.parameterType(fromPos);
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for (int i = fromPos+1; i < maxPos; i++) {
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if (argType != restargType.parameterType(i))
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throw newIllegalArgumentException("need homogeneous rest arguments", restargType);
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}
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if (argType == Object.class) return Object[].class;
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return Array.newInstance(argType, 0).getClass();
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}
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public String toString() {
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return "Invokers"+targetType;
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}
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static MemberName methodHandleInvokeLinkerMethod(String name,
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MethodType mtype,
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Object[] appendixResult) {
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int which;
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switch (name) {
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case "invokeExact": which = MethodTypeForm.LF_EX_LINKER; break;
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case "invoke": which = MethodTypeForm.LF_GEN_LINKER; break;
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default: throw new InternalError("not invoker: "+name);
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}
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LambdaForm lform;
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if (mtype.parameterSlotCount() <= MethodType.MAX_MH_ARITY - MH_LINKER_ARG_APPENDED) {
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lform = invokeHandleForm(mtype, false, which);
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appendixResult[0] = mtype;
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} else {
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lform = invokeHandleForm(mtype, true, which);
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}
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return lform.vmentry;
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}
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// argument count to account for trailing "appendix value" (typically the mtype)
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private static final int MH_LINKER_ARG_APPENDED = 1;
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/** Returns an adapter for invokeExact or generic invoke, as a MH or constant pool linker.
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* If !customized, caller is responsible for supplying, during adapter execution,
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* a copy of the exact mtype. This is because the adapter might be generalized to
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* a basic type.
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* @param mtype the caller's method type (either basic or full-custom)
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* @param customized whether to use a trailing appendix argument (to carry the mtype)
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* @param which bit-encoded 0x01 whether it is a CP adapter ("linker") or MHs.invoker value ("invoker");
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* 0x02 whether it is for invokeExact or generic invoke
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*/
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static LambdaForm invokeHandleForm(MethodType mtype, boolean customized, int which) {
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boolean isCached;
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if (!customized) {
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mtype = mtype.basicType(); // normalize Z to I, String to Object, etc.
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isCached = true;
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} else {
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isCached = false; // maybe cache if mtype == mtype.basicType()
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}
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boolean isLinker, isGeneric;
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Kind kind;
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switch (which) {
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case MethodTypeForm.LF_EX_LINKER: isLinker = true; isGeneric = false; kind = EXACT_LINKER; break;
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case MethodTypeForm.LF_EX_INVOKER: isLinker = false; isGeneric = false; kind = EXACT_INVOKER; break;
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case MethodTypeForm.LF_GEN_LINKER: isLinker = true; isGeneric = true; kind = GENERIC_LINKER; break;
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case MethodTypeForm.LF_GEN_INVOKER: isLinker = false; isGeneric = true; kind = GENERIC_INVOKER; break;
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default: throw new InternalError();
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}
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LambdaForm lform;
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if (isCached) {
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lform = mtype.form().cachedLambdaForm(which);
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if (lform != null) return lform;
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}
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// exactInvokerForm (Object,Object)Object
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// link with java.lang.invoke.MethodHandle.invokeBasic(MethodHandle,Object,Object)Object/invokeSpecial
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final int THIS_MH = 0;
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final int CALL_MH = THIS_MH + (isLinker ? 0 : 1);
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final int ARG_BASE = CALL_MH + 1;
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final int OUTARG_LIMIT = ARG_BASE + mtype.parameterCount();
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final int INARG_LIMIT = OUTARG_LIMIT + (isLinker && !customized ? 1 : 0);
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int nameCursor = OUTARG_LIMIT;
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final int MTYPE_ARG = customized ? -1 : nameCursor++; // might be last in-argument
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final int CHECK_TYPE = nameCursor++;
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final int CHECK_CUSTOM = (CUSTOMIZE_THRESHOLD >= 0) ? nameCursor++ : -1;
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final int LINKER_CALL = nameCursor++;
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MethodType invokerFormType = mtype.invokerType();
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if (isLinker) {
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if (!customized)
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invokerFormType = invokerFormType.appendParameterTypes(MemberName.class);
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} else {
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invokerFormType = invokerFormType.invokerType();
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}
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Name[] names = arguments(nameCursor - INARG_LIMIT, invokerFormType);
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assert(names.length == nameCursor)
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: Arrays.asList(mtype, customized, which, nameCursor, names.length);
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if (MTYPE_ARG >= INARG_LIMIT) {
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assert(names[MTYPE_ARG] == null);
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BoundMethodHandle.SpeciesData speciesData = BoundMethodHandle.speciesData_L();
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names[THIS_MH] = names[THIS_MH].withConstraint(speciesData);
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NamedFunction getter = speciesData.getterFunction(0);
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names[MTYPE_ARG] = new Name(getter, names[THIS_MH]);
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// else if isLinker, then MTYPE is passed in from the caller (e.g., the JVM)
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}
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// Make the final call. If isGeneric, then prepend the result of type checking.
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MethodType outCallType = mtype.basicType();
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Object[] outArgs = Arrays.copyOfRange(names, CALL_MH, OUTARG_LIMIT, Object[].class);
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Object mtypeArg = (customized ? mtype : names[MTYPE_ARG]);
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if (!isGeneric) {
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names[CHECK_TYPE] = new Name(getFunction(NF_checkExactType), names[CALL_MH], mtypeArg);
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// mh.invokeExact(a*):R => checkExactType(mh, TYPEOF(a*:R)); mh.invokeBasic(a*)
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} else {
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names[CHECK_TYPE] = new Name(getFunction(NF_checkGenericType), names[CALL_MH], mtypeArg);
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// mh.invokeGeneric(a*):R => checkGenericType(mh, TYPEOF(a*:R)).invokeBasic(a*)
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outArgs[0] = names[CHECK_TYPE];
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}
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if (CHECK_CUSTOM != -1) {
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names[CHECK_CUSTOM] = new Name(getFunction(NF_checkCustomized), outArgs[0]);
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}
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names[LINKER_CALL] = new Name(outCallType, outArgs);
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if (customized) {
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lform = new LambdaForm(INARG_LIMIT, names);
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} else {
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lform = new LambdaForm(INARG_LIMIT, names, kind);
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}
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if (isLinker)
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lform.compileToBytecode(); // JVM needs a real methodOop
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if (isCached)
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lform = mtype.form().setCachedLambdaForm(which, lform);
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return lform;
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}
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static MemberName varHandleInvokeLinkerMethod(VarHandle.AccessMode ak, MethodType mtype) {
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LambdaForm lform;
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if (mtype.parameterSlotCount() <= MethodType.MAX_MH_ARITY - MH_LINKER_ARG_APPENDED) {
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lform = varHandleMethodGenericLinkerHandleForm(ak, mtype);
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} else {
|
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// TODO
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throw newInternalError("Unsupported parameter slot count " + mtype.parameterSlotCount());
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}
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return lform.vmentry;
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}
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private static LambdaForm varHandleMethodGenericLinkerHandleForm(VarHandle.AccessMode ak,
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MethodType mtype) {
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// TODO Cache form?
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final int THIS_VH = 0;
|
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final int ARG_BASE = THIS_VH + 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 VAD_ARG = nameCursor++;
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final int CHECK_TYPE = nameCursor++;
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final int CHECK_CUSTOM = (CUSTOMIZE_THRESHOLD >= 0) ? nameCursor++ : -1;
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final int LINKER_CALL = nameCursor++;
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Name[] names = new Name[LINKER_CALL + 1];
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names[THIS_VH] = argument(THIS_VH, BasicType.basicType(Object.class));
|
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for (int i = 0; i < mtype.parameterCount(); i++) {
|
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names[ARG_BASE + i] = argument(ARG_BASE + i, BasicType.basicType(mtype.parameterType(i)));
|
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}
|
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names[VAD_ARG] = new Name(ARG_LIMIT, BasicType.basicType(Object.class));
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|
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names[CHECK_TYPE] = new Name(getFunction(NF_checkVarHandleGenericType), names[THIS_VH], names[VAD_ARG]);
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Object[] outArgs = new Object[ARG_LIMIT + 1];
|
||||
outArgs[0] = names[CHECK_TYPE];
|
||||
for (int i = 0; i < ARG_LIMIT; i++) {
|
||||
outArgs[i + 1] = names[i];
|
||||
}
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||||
|
||||
if (CHECK_CUSTOM != -1) {
|
||||
names[CHECK_CUSTOM] = new Name(getFunction(NF_checkCustomized), outArgs[0]);
|
||||
}
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||||
|
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MethodType outCallType = mtype.insertParameterTypes(0, VarHandle.class)
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||||
.basicType();
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names[LINKER_CALL] = new Name(outCallType, outArgs);
|
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LambdaForm lform = new LambdaForm(ARG_LIMIT + 1, names, VARHANDLE_LINKER);
|
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if (LambdaForm.debugNames()) {
|
||||
String name = ak.methodName() + ":VarHandle_invoke_MT_" +
|
||||
shortenSignature(basicTypeSignature(mtype));
|
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LambdaForm.associateWithDebugName(lform, name);
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}
|
||||
lform.compileToBytecode();
|
||||
return lform;
|
||||
}
|
||||
|
||||
private static LambdaForm varHandleMethodInvokerHandleForm(VarHandle.AccessMode ak,
|
||||
MethodType mtype, boolean isExact) {
|
||||
// TODO Cache form?
|
||||
|
||||
final int THIS_MH = 0;
|
||||
final int CALL_VH = THIS_MH + 1;
|
||||
final int ARG_BASE = CALL_VH + 1;
|
||||
final int ARG_LIMIT = ARG_BASE + mtype.parameterCount();
|
||||
int nameCursor = ARG_LIMIT;
|
||||
final int VAD_ARG = nameCursor++;
|
||||
final int CHECK_TYPE = nameCursor++;
|
||||
final int LINKER_CALL = nameCursor++;
|
||||
|
||||
Name[] names = new Name[LINKER_CALL + 1];
|
||||
names[THIS_MH] = argument(THIS_MH, BasicType.basicType(Object.class));
|
||||
names[CALL_VH] = argument(CALL_VH, BasicType.basicType(Object.class));
|
||||
for (int i = 0; i < mtype.parameterCount(); i++) {
|
||||
names[ARG_BASE + i] = argument(ARG_BASE + i, BasicType.basicType(mtype.parameterType(i)));
|
||||
}
|
||||
|
||||
BoundMethodHandle.SpeciesData speciesData = BoundMethodHandle.speciesData_L();
|
||||
names[THIS_MH] = names[THIS_MH].withConstraint(speciesData);
|
||||
|
||||
NamedFunction getter = speciesData.getterFunction(0);
|
||||
names[VAD_ARG] = new Name(getter, names[THIS_MH]);
|
||||
|
||||
if (isExact) {
|
||||
names[CHECK_TYPE] = new Name(getFunction(NF_checkVarHandleExactType), names[CALL_VH], names[VAD_ARG]);
|
||||
} else {
|
||||
names[CHECK_TYPE] = new Name(getFunction(NF_checkVarHandleGenericType), names[CALL_VH], names[VAD_ARG]);
|
||||
}
|
||||
Object[] outArgs = new Object[ARG_LIMIT];
|
||||
outArgs[0] = names[CHECK_TYPE];
|
||||
for (int i = 1; i < ARG_LIMIT; i++) {
|
||||
outArgs[i] = names[i];
|
||||
}
|
||||
|
||||
MethodType outCallType = mtype.insertParameterTypes(0, VarHandle.class)
|
||||
.basicType();
|
||||
names[LINKER_CALL] = new Name(outCallType, outArgs);
|
||||
Kind kind = isExact ? VARHANDLE_EXACT_INVOKER : VARHANDLE_INVOKER;
|
||||
LambdaForm lform = new LambdaForm(ARG_LIMIT, names, kind);
|
||||
if (LambdaForm.debugNames()) {
|
||||
String name = ak.methodName() +
|
||||
(isExact ? ":VarHandle_exactInvoker_" : ":VarHandle_invoker_") +
|
||||
shortenSignature(basicTypeSignature(mtype));
|
||||
LambdaForm.associateWithDebugName(lform, name);
|
||||
}
|
||||
lform.prepare();
|
||||
return lform;
|
||||
}
|
||||
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
MethodHandle checkVarHandleGenericType(VarHandle handle, VarHandle.AccessDescriptor ad) {
|
||||
// Test for exact match on invoker types
|
||||
// TODO match with erased types and add cast of return value to lambda form
|
||||
MethodHandle mh = handle.getMethodHandle(ad.mode);
|
||||
if (mh.type() == ad.symbolicMethodTypeInvoker) {
|
||||
return mh;
|
||||
}
|
||||
else {
|
||||
return mh.asType(ad.symbolicMethodTypeInvoker);
|
||||
}
|
||||
}
|
||||
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
MethodHandle checkVarHandleExactType(VarHandle handle, VarHandle.AccessDescriptor ad) {
|
||||
MethodHandle mh = handle.getMethodHandle(ad.mode);
|
||||
MethodType mt = mh.type();
|
||||
if (mt != ad.symbolicMethodTypeInvoker) {
|
||||
throw newWrongMethodTypeException(mt, ad.symbolicMethodTypeInvoker);
|
||||
}
|
||||
return mh;
|
||||
}
|
||||
|
||||
/*non-public*/ static
|
||||
WrongMethodTypeException newWrongMethodTypeException(MethodType actual, MethodType expected) {
|
||||
// FIXME: merge with JVM logic for throwing WMTE
|
||||
return new WrongMethodTypeException("expected "+expected+" but found "+actual);
|
||||
}
|
||||
|
||||
/** Static definition of MethodHandle.invokeExact checking code. */
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
void checkExactType(MethodHandle mh, MethodType expected) {
|
||||
MethodType actual = mh.type();
|
||||
if (actual != expected)
|
||||
throw newWrongMethodTypeException(expected, actual);
|
||||
}
|
||||
|
||||
/** Static definition of MethodHandle.invokeGeneric checking code.
|
||||
* Directly returns the type-adjusted MH to invoke, as follows:
|
||||
* {@code (R)MH.invoke(a*) => MH.asType(TYPEOF(a*:R)).invokeBasic(a*)}
|
||||
*/
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
MethodHandle checkGenericType(MethodHandle mh, MethodType expected) {
|
||||
return mh.asType(expected);
|
||||
/* Maybe add more paths here. Possible optimizations:
|
||||
* for (R)MH.invoke(a*),
|
||||
* let MT0 = TYPEOF(a*:R), MT1 = MH.type
|
||||
*
|
||||
* if MT0==MT1 or MT1 can be safely called by MT0
|
||||
* => MH.invokeBasic(a*)
|
||||
* if MT1 can be safely called by MT0[R := Object]
|
||||
* => MH.invokeBasic(a*) & checkcast(R)
|
||||
* if MT1 can be safely called by MT0[* := Object]
|
||||
* => checkcast(A)* & MH.invokeBasic(a*) & checkcast(R)
|
||||
* if a big adapter BA can be pulled out of (MT0,MT1)
|
||||
* => BA.invokeBasic(MT0,MH,a*)
|
||||
* if a local adapter LA can cached on static CS0 = new GICS(MT0)
|
||||
* => CS0.LA.invokeBasic(MH,a*)
|
||||
* else
|
||||
* => MH.asType(MT0).invokeBasic(A*)
|
||||
*/
|
||||
}
|
||||
|
||||
static MemberName linkToCallSiteMethod(MethodType mtype) {
|
||||
LambdaForm lform = callSiteForm(mtype, false);
|
||||
return lform.vmentry;
|
||||
}
|
||||
|
||||
static MemberName linkToTargetMethod(MethodType mtype) {
|
||||
LambdaForm lform = callSiteForm(mtype, true);
|
||||
return lform.vmentry;
|
||||
}
|
||||
|
||||
// skipCallSite is true if we are optimizing a ConstantCallSite
|
||||
private static LambdaForm callSiteForm(MethodType mtype, boolean skipCallSite) {
|
||||
mtype = mtype.basicType(); // normalize Z to I, String to Object, etc.
|
||||
final int which = (skipCallSite ? MethodTypeForm.LF_MH_LINKER : MethodTypeForm.LF_CS_LINKER);
|
||||
LambdaForm lform = mtype.form().cachedLambdaForm(which);
|
||||
if (lform != null) return lform;
|
||||
// exactInvokerForm (Object,Object)Object
|
||||
// link with java.lang.invoke.MethodHandle.invokeBasic(MethodHandle,Object,Object)Object/invokeSpecial
|
||||
final int ARG_BASE = 0;
|
||||
final int OUTARG_LIMIT = ARG_BASE + mtype.parameterCount();
|
||||
final int INARG_LIMIT = OUTARG_LIMIT + 1;
|
||||
int nameCursor = OUTARG_LIMIT;
|
||||
final int APPENDIX_ARG = nameCursor++; // the last in-argument
|
||||
final int CSITE_ARG = skipCallSite ? -1 : APPENDIX_ARG;
|
||||
final int CALL_MH = skipCallSite ? APPENDIX_ARG : nameCursor++; // result of getTarget
|
||||
final int LINKER_CALL = nameCursor++;
|
||||
MethodType invokerFormType = mtype.appendParameterTypes(skipCallSite ? MethodHandle.class : CallSite.class);
|
||||
Name[] names = arguments(nameCursor - INARG_LIMIT, invokerFormType);
|
||||
assert(names.length == nameCursor);
|
||||
assert(names[APPENDIX_ARG] != null);
|
||||
if (!skipCallSite)
|
||||
names[CALL_MH] = new Name(getFunction(NF_getCallSiteTarget), names[CSITE_ARG]);
|
||||
// (site.)invokedynamic(a*):R => mh = site.getTarget(); mh.invokeBasic(a*)
|
||||
final int PREPEND_MH = 0, PREPEND_COUNT = 1;
|
||||
Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, OUTARG_LIMIT + PREPEND_COUNT, Object[].class);
|
||||
// prepend MH argument:
|
||||
System.arraycopy(outArgs, 0, outArgs, PREPEND_COUNT, outArgs.length - PREPEND_COUNT);
|
||||
outArgs[PREPEND_MH] = names[CALL_MH];
|
||||
names[LINKER_CALL] = new Name(mtype, outArgs);
|
||||
lform = new LambdaForm(INARG_LIMIT, names,
|
||||
(skipCallSite ? LINK_TO_TARGET_METHOD : LINK_TO_CALL_SITE));
|
||||
lform.compileToBytecode(); // JVM needs a real methodOop
|
||||
lform = mtype.form().setCachedLambdaForm(which, lform);
|
||||
return lform;
|
||||
}
|
||||
|
||||
/** Static definition of MethodHandle.invokeGeneric checking code. */
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
MethodHandle getCallSiteTarget(CallSite site) {
|
||||
return site.getTarget();
|
||||
}
|
||||
|
||||
/*non-public*/ static
|
||||
@ForceInline
|
||||
void checkCustomized(MethodHandle mh) {
|
||||
if (MethodHandleImpl.isCompileConstant(mh)) return;
|
||||
if (mh.form.customized == null) {
|
||||
maybeCustomize(mh);
|
||||
}
|
||||
}
|
||||
|
||||
/*non-public*/ static
|
||||
@DontInline
|
||||
void maybeCustomize(MethodHandle mh) {
|
||||
byte count = mh.customizationCount;
|
||||
if (count >= CUSTOMIZE_THRESHOLD) {
|
||||
mh.customize();
|
||||
} else {
|
||||
mh.customizationCount = (byte)(count+1);
|
||||
}
|
||||
}
|
||||
|
||||
// Local constant functions:
|
||||
private static final byte NF_checkExactType = 0,
|
||||
NF_checkGenericType = 1,
|
||||
NF_getCallSiteTarget = 2,
|
||||
NF_checkCustomized = 3,
|
||||
NF_checkVarHandleGenericType = 4,
|
||||
NF_checkVarHandleExactType = 5,
|
||||
NF_LIMIT = 6;
|
||||
|
||||
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;
|
||||
}
|
||||
NFS[func] = nf = createFunction(func);
|
||||
// Each nf must be statically invocable or we get tied up in our bootstraps.
|
||||
assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf));
|
||||
return nf;
|
||||
}
|
||||
|
||||
private static NamedFunction createFunction(byte func) {
|
||||
try {
|
||||
switch (func) {
|
||||
case NF_checkExactType:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("checkExactType", MethodHandle.class, MethodType.class));
|
||||
case NF_checkGenericType:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("checkGenericType", MethodHandle.class, MethodType.class));
|
||||
case NF_getCallSiteTarget:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("getCallSiteTarget", CallSite.class));
|
||||
case NF_checkCustomized:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("checkCustomized", MethodHandle.class));
|
||||
case NF_checkVarHandleGenericType:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("checkVarHandleGenericType", VarHandle.class, VarHandle.AccessDescriptor.class));
|
||||
case NF_checkVarHandleExactType:
|
||||
return new NamedFunction(Invokers.class
|
||||
.getDeclaredMethod("checkVarHandleExactType", VarHandle.class, VarHandle.AccessDescriptor.class));
|
||||
default:
|
||||
throw newInternalError("Unknown function: " + func);
|
||||
}
|
||||
} catch (ReflectiveOperationException ex) {
|
||||
throw newInternalError(ex);
|
||||
}
|
||||
}
|
||||
|
||||
private static class Lazy {
|
||||
private static final MethodHandle MH_asSpreader;
|
||||
|
||||
static {
|
||||
try {
|
||||
MH_asSpreader = IMPL_LOOKUP.findVirtual(MethodHandle.class, "asSpreader",
|
||||
MethodType.methodType(MethodHandle.class, Class.class, int.class));
|
||||
} catch (ReflectiveOperationException ex) {
|
||||
throw newInternalError(ex);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static {
|
||||
// The Holder class will contain pre-generated Invokers 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 Invokers generated ahead of time */
|
||||
final class Holder {}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue