author | vlivanov |
Fri, 24 Oct 2014 08:22:17 -0700 | |
changeset 27196 | fe9dbab34d1d |
parent 26479 | a60a19ec5ce5 |
child 29020 | 9f6d43586ccb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
|
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* questions. |
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*/ |
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package java.lang.invoke; |
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import 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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/** |
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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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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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/** 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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/** |
146 |
* Find or create an invoker which passes unchanged a given number of arguments |
|
147 |
* and spreads the rest from a trailing array argument. |
|
148 |
* The invoker target type is the post-spread type {@code (TYPEOF(uarg*), TYPEOF(sarg*))=>RT}. |
|
149 |
* All the {@code sarg}s must have a common type {@code C}. (If there are none, {@code Object} is assumed.} |
|
150 |
* @param leadingArgCount the number of unchanged (non-spread) arguments |
|
151 |
* @return {@code invoker.invokeExact(mh, uarg*, C[]{sarg*}) := (RT)mh.invoke(uarg*, sarg*)} |
|
152 |
*/ |
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153 |
/*non-public*/ MethodHandle spreadInvoker(int leadingArgCount) { |
|
154 |
int spreadArgCount = targetType.parameterCount() - leadingArgCount; |
|
155 |
MethodType postSpreadType = targetType; |
|
156 |
Class<?> argArrayType = impliedRestargType(postSpreadType, leadingArgCount); |
|
157 |
if (postSpreadType.parameterSlotCount() <= MethodType.MAX_MH_INVOKER_ARITY) { |
|
158 |
return genericInvoker().asSpreader(argArrayType, spreadArgCount); |
|
159 |
} |
|
160 |
// Cannot build a generic invoker here of type ginvoker.invoke(mh, a*[254]). |
|
161 |
// Instead, factor sinvoker.invoke(mh, a) into ainvoker.invoke(filter(mh), a) |
|
162 |
// where filter(mh) == mh.asSpreader(Object[], spreadArgCount) |
|
163 |
MethodType preSpreadType = postSpreadType |
|
164 |
.replaceParameterTypes(leadingArgCount, postSpreadType.parameterCount(), argArrayType); |
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165 |
MethodHandle arrayInvoker = MethodHandles.invoker(preSpreadType); |
|
166 |
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) { |
171 |
if (restargType.isGeneric()) return Object[].class; // can be nothing else |
|
172 |
int maxPos = restargType.parameterCount(); |
|
173 |
if (fromPos >= maxPos) return Object[].class; // reasonable default |
|
174 |
Class<?> argType = restargType.parameterType(fromPos); |
|
175 |
for (int i = fromPos+1; i < maxPos; i++) { |
|
176 |
if (argType != restargType.parameterType(i)) |
|
177 |
throw newIllegalArgumentException("need homogeneous rest arguments", restargType); |
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} |
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if (argType == Object.class) return Object[].class; |
180 |
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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186 |
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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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205 |
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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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208 |
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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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private 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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String debugName; |
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switch (which) { |
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case MethodTypeForm.LF_EX_LINKER: isLinker = true; isGeneric = false; debugName = "invokeExact_MT"; break; |
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case MethodTypeForm.LF_EX_INVOKER: isLinker = false; isGeneric = false; debugName = "exactInvoker"; break; |
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case MethodTypeForm.LF_GEN_LINKER: isLinker = true; isGeneric = true; debugName = "invoke_MT"; break; |
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case MethodTypeForm.LF_GEN_INVOKER: isLinker = false; isGeneric = true; debugName = "invoker"; break; |
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default: throw new InternalError(); |
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234 |
} |
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235 |
LambdaForm lform; |
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236 |
if (isCached) { |
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lform = mtype.form().cachedLambdaForm(which); |
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if (lform != null) return lform; |
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239 |
} |
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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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250 |
final int LINKER_CALL = nameCursor++; |
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MethodType invokerFormType = mtype.invokerType(); |
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252 |
if (isLinker) { |
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253 |
if (!customized) |
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254 |
invokerFormType = invokerFormType.appendParameterTypes(MemberName.class); |
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255 |
} else { |
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invokerFormType = invokerFormType.invokerType(); |
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257 |
} |
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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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261 |
if (MTYPE_ARG >= INARG_LIMIT) { |
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assert(names[MTYPE_ARG] == null); |
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263 |
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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267 |
// else if isLinker, then MTYPE is passed in from the caller (e.g., the JVM) |
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268 |
} |
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269 |
|
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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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274 |
if (!isGeneric) { |
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275 |
names[CHECK_TYPE] = new Name(NF_checkExactType, names[CALL_MH], mtypeArg); |
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276 |
// mh.invokeExact(a*):R => checkExactType(mh, TYPEOF(a*:R)); mh.invokeBasic(a*) |
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277 |
} else { |
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names[CHECK_TYPE] = new Name(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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281 |
} |
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names[LINKER_CALL] = new Name(outCallType, outArgs); |
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283 |
lform = new LambdaForm(debugName, INARG_LIMIT, names); |
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284 |
if (isLinker) |
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285 |
lform.compileToBytecode(); // JVM needs a real methodOop |
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286 |
if (isCached) |
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287 |
lform = mtype.form().setCachedLambdaForm(which, lform); |
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288 |
return lform; |
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289 |
} |
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290 |
|
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291 |
/*non-public*/ static |
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292 |
WrongMethodTypeException newWrongMethodTypeException(MethodType actual, MethodType expected) { |
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293 |
// FIXME: merge with JVM logic for throwing WMTE |
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294 |
return new WrongMethodTypeException("expected "+expected+" but found "+actual); |
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295 |
} |
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296 |
|
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297 |
/** Static definition of MethodHandle.invokeExact checking code. */ |
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298 |
/*non-public*/ static |
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@ForceInline |
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void checkExactType(Object mhObj, Object expectedObj) { |
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MethodHandle mh = (MethodHandle) mhObj; |
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MethodType expected = (MethodType) expectedObj; |
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MethodType actual = mh.type(); |
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if (actual != expected) |
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throw newWrongMethodTypeException(expected, actual); |
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} |
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307 |
|
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/** Static definition of MethodHandle.invokeGeneric checking code. |
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* Directly returns the type-adjusted MH to invoke, as follows: |
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* {@code (R)MH.invoke(a*) => MH.asType(TYPEOF(a*:R)).invokeBasic(a*)} |
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*/ |
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/*non-public*/ static |
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@ForceInline |
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Object checkGenericType(Object mhObj, Object expectedObj) { |
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MethodHandle mh = (MethodHandle) mhObj; |
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MethodType expected = (MethodType) expectedObj; |
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return mh.asType(expected); |
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318 |
/* Maybe add more paths here. Possible optimizations: |
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319 |
* for (R)MH.invoke(a*), |
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320 |
* let MT0 = TYPEOF(a*:R), MT1 = MH.type |
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* |
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* if MT0==MT1 or MT1 can be safely called by MT0 |
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323 |
* => MH.invokeBasic(a*) |
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* if MT1 can be safely called by MT0[R := Object] |
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* => MH.invokeBasic(a*) & checkcast(R) |
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326 |
* if MT1 can be safely called by MT0[* := Object] |
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* => checkcast(A)* & MH.invokeBasic(a*) & checkcast(R) |
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328 |
* if a big adapter BA can be pulled out of (MT0,MT1) |
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* => BA.invokeBasic(MT0,MH,a*) |
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* if a local adapter LA can cached on static CS0 = new GICS(MT0) |
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* => CS0.LA.invokeBasic(MH,a*) |
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332 |
* else |
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* => MH.asType(MT0).invokeBasic(A*) |
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334 |
*/ |
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335 |
} |
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336 |
|
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337 |
static MemberName linkToCallSiteMethod(MethodType mtype) { |
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LambdaForm lform = callSiteForm(mtype, false); |
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339 |
return lform.vmentry; |
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340 |
} |
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341 |
|
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342 |
static MemberName linkToTargetMethod(MethodType mtype) { |
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LambdaForm lform = callSiteForm(mtype, true); |
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return lform.vmentry; |
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345 |
} |
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346 |
|
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347 |
// skipCallSite is true if we are optimizing a ConstantCallSite |
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348 |
private static LambdaForm callSiteForm(MethodType mtype, boolean skipCallSite) { |
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mtype = mtype.basicType(); // normalize Z to I, String to Object, etc. |
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final int which = (skipCallSite ? MethodTypeForm.LF_MH_LINKER : MethodTypeForm.LF_CS_LINKER); |
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351 |
LambdaForm lform = mtype.form().cachedLambdaForm(which); |
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352 |
if (lform != null) return lform; |
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353 |
// exactInvokerForm (Object,Object)Object |
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354 |
// link with java.lang.invoke.MethodHandle.invokeBasic(MethodHandle,Object,Object)Object/invokeSpecial |
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355 |
final int ARG_BASE = 0; |
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356 |
final int OUTARG_LIMIT = ARG_BASE + mtype.parameterCount(); |
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final int INARG_LIMIT = OUTARG_LIMIT + 1; |
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int nameCursor = OUTARG_LIMIT; |
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359 |
final int APPENDIX_ARG = nameCursor++; // the last in-argument |
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360 |
final int CSITE_ARG = skipCallSite ? -1 : APPENDIX_ARG; |
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361 |
final int CALL_MH = skipCallSite ? APPENDIX_ARG : nameCursor++; // result of getTarget |
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362 |
final int LINKER_CALL = nameCursor++; |
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MethodType invokerFormType = mtype.appendParameterTypes(skipCallSite ? MethodHandle.class : CallSite.class); |
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Name[] names = arguments(nameCursor - INARG_LIMIT, invokerFormType); |
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365 |
assert(names.length == nameCursor); |
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366 |
assert(names[APPENDIX_ARG] != null); |
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367 |
if (!skipCallSite) |
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368 |
names[CALL_MH] = new Name(NF_getCallSiteTarget, names[CSITE_ARG]); |
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369 |
// (site.)invokedynamic(a*):R => mh = site.getTarget(); mh.invokeBasic(a*) |
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370 |
final int PREPEND_MH = 0, PREPEND_COUNT = 1; |
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371 |
Object[] outArgs = Arrays.copyOfRange(names, ARG_BASE, OUTARG_LIMIT + PREPEND_COUNT, Object[].class); |
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372 |
// prepend MH argument: |
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|
373 |
System.arraycopy(outArgs, 0, outArgs, PREPEND_COUNT, outArgs.length - PREPEND_COUNT); |
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374 |
outArgs[PREPEND_MH] = names[CALL_MH]; |
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375 |
names[LINKER_CALL] = new Name(mtype, outArgs); |
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|
376 |
lform = new LambdaForm((skipCallSite ? "linkToTargetMethod" : "linkToCallSite"), INARG_LIMIT, names); |
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377 |
lform.compileToBytecode(); // JVM needs a real methodOop |
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|
378 |
lform = mtype.form().setCachedLambdaForm(which, lform); |
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379 |
return lform; |
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|
380 |
} |
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|
381 |
|
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|
382 |
/** Static definition of MethodHandle.invokeGeneric checking code. */ |
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|
383 |
/*non-public*/ static |
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|
384 |
@ForceInline |
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|
385 |
Object getCallSiteTarget(Object site) { |
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|
386 |
return ((CallSite)site).getTarget(); |
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|
387 |
} |
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|
388 |
|
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|
389 |
// Local constant functions: |
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|
390 |
private static final NamedFunction |
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|
391 |
NF_checkExactType, |
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|
392 |
NF_checkGenericType, |
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|
393 |
NF_getCallSiteTarget; |
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|
394 |
static { |
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|
395 |
try { |
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|
396 |
NamedFunction nfs[] = { |
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|
397 |
NF_checkExactType = new NamedFunction(Invokers.class |
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|
398 |
.getDeclaredMethod("checkExactType", Object.class, Object.class)), |
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|
399 |
NF_checkGenericType = new NamedFunction(Invokers.class |
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|
400 |
.getDeclaredMethod("checkGenericType", Object.class, Object.class)), |
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|
401 |
NF_getCallSiteTarget = new NamedFunction(Invokers.class |
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|
402 |
.getDeclaredMethod("getCallSiteTarget", Object.class)) |
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|
403 |
}; |
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|
404 |
for (NamedFunction nf : nfs) { |
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|
405 |
// Each nf must be statically invocable or we get tied up in our bootstraps. |
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|
406 |
assert(InvokerBytecodeGenerator.isStaticallyInvocable(nf.member)) : nf; |
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|
407 |
nf.resolve(); |
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|
408 |
} |
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|
409 |
} catch (ReflectiveOperationException ex) { |
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|
410 |
throw newInternalError(ex); |
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|
411 |
} |
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|
412 |
} |
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|
413 |
|
26468 | 414 |
private static class Lazy { |
415 |
private static final MethodHandle MH_asSpreader; |
|
416 |
||
417 |
static { |
|
418 |
try { |
|
419 |
MH_asSpreader = IMPL_LOOKUP.findVirtual(MethodHandle.class, "asSpreader", |
|
420 |
MethodType.methodType(MethodHandle.class, Class.class, int.class)); |
|
421 |
} catch (ReflectiveOperationException ex) { |
|
422 |
throw newInternalError(ex); |
|
423 |
} |
|
424 |
} |
|
425 |
} |
|
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|
426 |
} |