| /* |
| * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang.invoke; |
| |
| import jdk.internal.vm.annotation.DontInline; |
| import jdk.internal.vm.annotation.ForceInline; |
| import jdk.internal.vm.annotation.Hidden; |
| import jdk.internal.vm.annotation.Stable; |
| |
| import java.lang.reflect.Array; |
| import java.util.Arrays; |
| |
| import static java.lang.invoke.MethodHandleStatics.*; |
| import static java.lang.invoke.MethodHandleNatives.Constants.*; |
| import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; |
| import static java.lang.invoke.LambdaForm.*; |
| import static java.lang.invoke.LambdaForm.Kind.*; |
| |
| /** |
| * Construction and caching of often-used invokers. |
| * @author jrose |
| */ |
| class Invokers { |
| // exact type (sans leading target MH) for the outgoing call |
| private final MethodType targetType; |
| |
| // Cached adapter information: |
| private final @Stable MethodHandle[] invokers = new MethodHandle[INV_LIMIT]; |
| // Indexes into invokers: |
| static final int |
| INV_EXACT = 0, // MethodHandles.exactInvoker |
| INV_GENERIC = 1, // MethodHandles.invoker (generic invocation) |
| INV_BASIC = 2, // MethodHandles.basicInvoker |
| VH_INV_EXACT = 3, // MethodHandles.varHandleExactInvoker |
| VH_INV_GENERIC = VH_INV_EXACT + VarHandle.AccessMode.COUNT, // MethodHandles.varHandleInvoker |
| INV_LIMIT = VH_INV_GENERIC + VarHandle.AccessMode.COUNT; |
| |
| /** Compute and cache information common to all collecting adapters |
| * that implement members of the erasure-family of the given erased type. |
| */ |
| /*non-public*/ |
| Invokers(MethodType targetType) { |
| this.targetType = targetType; |
| } |
| |
| /*non-public*/ |
| MethodHandle exactInvoker() { |
| MethodHandle invoker = cachedInvoker(INV_EXACT); |
| if (invoker != null) return invoker; |
| invoker = makeExactOrGeneralInvoker(true); |
| return setCachedInvoker(INV_EXACT, invoker); |
| } |
| |
| /*non-public*/ |
| MethodHandle genericInvoker() { |
| MethodHandle invoker = cachedInvoker(INV_GENERIC); |
| if (invoker != null) return invoker; |
| invoker = makeExactOrGeneralInvoker(false); |
| return setCachedInvoker(INV_GENERIC, invoker); |
| } |
| |
| /*non-public*/ |
| MethodHandle basicInvoker() { |
| MethodHandle invoker = cachedInvoker(INV_BASIC); |
| if (invoker != null) return invoker; |
| MethodType basicType = targetType.basicType(); |
| if (basicType != targetType) { |
| // double cache; not used significantly |
| return setCachedInvoker(INV_BASIC, basicType.invokers().basicInvoker()); |
| } |
| invoker = basicType.form().cachedMethodHandle(MethodTypeForm.MH_BASIC_INV); |
| if (invoker == null) { |
| MemberName method = invokeBasicMethod(basicType); |
| invoker = DirectMethodHandle.make(method); |
| assert(checkInvoker(invoker)); |
| invoker = basicType.form().setCachedMethodHandle(MethodTypeForm.MH_BASIC_INV, invoker); |
| } |
| return setCachedInvoker(INV_BASIC, invoker); |
| } |
| |
| /*non-public*/ |
| MethodHandle varHandleMethodInvoker(VarHandle.AccessMode ak) { |
| boolean isExact = false; |
| MethodHandle invoker = cachedVHInvoker(isExact, ak); |
| if (invoker != null) return invoker; |
| invoker = makeVarHandleMethodInvoker(ak, isExact); |
| return setCachedVHInvoker(isExact, ak, invoker); |
| } |
| |
| /*non-public*/ |
| MethodHandle varHandleMethodExactInvoker(VarHandle.AccessMode ak) { |
| boolean isExact = true; |
| MethodHandle invoker = cachedVHInvoker(isExact, ak); |
| if (invoker != null) return invoker; |
| invoker = makeVarHandleMethodInvoker(ak, isExact); |
| return setCachedVHInvoker(isExact, ak, invoker); |
| } |
| |
| private MethodHandle cachedInvoker(int idx) { |
| return invokers[idx]; |
| } |
| |
| private synchronized MethodHandle setCachedInvoker(int idx, final MethodHandle invoker) { |
| // Simulate a CAS, to avoid racy duplication of results. |
| MethodHandle prev = invokers[idx]; |
| if (prev != null) return prev; |
| return invokers[idx] = invoker; |
| } |
| |
| private MethodHandle cachedVHInvoker(boolean isExact, VarHandle.AccessMode ak) { |
| int baseIndex = (isExact ? VH_INV_EXACT : VH_INV_GENERIC); |
| return cachedInvoker(baseIndex + ak.ordinal()); |
| } |
| |
| private MethodHandle setCachedVHInvoker(boolean isExact, VarHandle.AccessMode ak, final MethodHandle invoker) { |
| int baseIndex = (isExact ? VH_INV_EXACT : VH_INV_GENERIC); |
| return setCachedInvoker(baseIndex + ak.ordinal(), invoker); |
| } |
| |
| private MethodHandle makeExactOrGeneralInvoker(boolean isExact) { |
| MethodType mtype = targetType; |
| MethodType invokerType = mtype.invokerType(); |
| int which = (isExact ? MethodTypeForm.LF_EX_INVOKER : MethodTypeForm.LF_GEN_INVOKER); |
| LambdaForm lform = invokeHandleForm(mtype, false, which); |
| MethodHandle invoker = BoundMethodHandle.bindSingle(invokerType, lform, mtype); |
| String whichName = (isExact ? "invokeExact" : "invoke"); |
| invoker = invoker.withInternalMemberName(MemberName.makeMethodHandleInvoke(whichName, mtype), false); |
| assert(checkInvoker(invoker)); |
| maybeCompileToBytecode(invoker); |
| return invoker; |
| } |
| |
| private MethodHandle makeVarHandleMethodInvoker(VarHandle.AccessMode ak, boolean isExact) { |
| MethodType mtype = targetType; |
| MethodType invokerType = mtype.insertParameterTypes(0, VarHandle.class); |
| |
| LambdaForm lform = varHandleMethodInvokerHandleForm(mtype, isExact); |
| VarHandle.AccessDescriptor ad = new VarHandle.AccessDescriptor(mtype, ak.at.ordinal(), ak.ordinal()); |
| MethodHandle invoker = BoundMethodHandle.bindSingle(invokerType, lform, ad); |
| |
| invoker = invoker.withInternalMemberName(MemberName.makeVarHandleMethodInvoke(ak.methodName(), mtype), false); |
| assert(checkVarHandleInvoker(invoker)); |
| |
| maybeCompileToBytecode(invoker); |
| return invoker; |
| } |
| |
| /** If the target type seems to be common enough, eagerly compile the invoker to bytecodes. */ |
| private void maybeCompileToBytecode(MethodHandle invoker) { |
| final int EAGER_COMPILE_ARITY_LIMIT = 10; |
| if (targetType == targetType.erase() && |
| targetType.parameterCount() < EAGER_COMPILE_ARITY_LIMIT) { |
| invoker.form.compileToBytecode(); |
| } |
| } |
| |
| // This next one is called from LambdaForm.NamedFunction.<init>. |
| /*non-public*/ |
| static MemberName invokeBasicMethod(MethodType basicType) { |
| assert(basicType == basicType.basicType()); |
| try { |
| //Lookup.findVirtual(MethodHandle.class, name, type); |
| return IMPL_LOOKUP.resolveOrFail(REF_invokeVirtual, MethodHandle.class, "invokeBasic", basicType); |
| } catch (ReflectiveOperationException ex) { |
| throw newInternalError("JVM cannot find invoker for "+basicType, ex); |
| } |
| } |
| |
| private boolean checkInvoker(MethodHandle invoker) { |
| assert(targetType.invokerType().equals(invoker.type())) |
| : java.util.Arrays.asList(targetType, targetType.invokerType(), invoker); |
| assert(invoker.internalMemberName() == null || |
| invoker.internalMemberName().getMethodType().equals(targetType)); |
| assert(!invoker.isVarargsCollector()); |
| return true; |
| } |
| |
| private boolean checkVarHandleInvoker(MethodHandle invoker) { |
| MethodType invokerType = targetType.insertParameterTypes(0, VarHandle.class); |
| assert(invokerType.equals(invoker.type())) |
| : java.util.Arrays.asList(targetType, invokerType, invoker); |
| assert(invoker.internalMemberName() == null || |
| invoker.internalMemberName().getMethodType().equals(targetType)); |
| assert(!invoker.isVarargsCollector()); |
| return true; |
| } |
| |
| /** |
| * Find or create an invoker which passes unchanged a given number of arguments |
| * and spreads the rest from a trailing array argument. |
| * The invoker target type is the post-spread type {@code (TYPEOF(uarg*), TYPEOF(sarg*))=>RT}. |
| * All the {@code sarg}s must have a common type {@code C}. (If there are none, {@code Object} is assumed.} |
| * @param leadingArgCount the number of unchanged (non-spread) arguments |
| * @return {@code invoker.invokeExact(mh, uarg*, C[]{sarg*}) := (RT)mh.invoke(uarg*, sarg*)} |
| */ |
| /*non-public*/ |
| MethodHandle spreadInvoker(int leadingArgCount) { |
| int spreadArgCount = targetType.parameterCount() - leadingArgCount; |
| MethodType postSpreadType = targetType; |
| Class<?> argArrayType = impliedRestargType(postSpreadType, leadingArgCount); |
| if (postSpreadType.parameterSlotCount() <= MethodType.MAX_MH_INVOKER_ARITY) { |
| return genericInvoker().asSpreader(argArrayType, spreadArgCount); |
| } |
| // Cannot build a generic invoker here of type ginvoker.invoke(mh, a*[254]). |
| // Instead, factor sinvoker.invoke(mh, a) into ainvoker.invoke(filter(mh), a) |
| // where filter(mh) == mh.asSpreader(Object[], spreadArgCount) |
| MethodType preSpreadType = postSpreadType |
| .replaceParameterTypes(leadingArgCount, postSpreadType.parameterCount(), argArrayType); |
| MethodHandle arrayInvoker = MethodHandles.invoker(preSpreadType); |
| MethodHandle makeSpreader = MethodHandles.insertArguments(Lazy.MH_asSpreader, 1, argArrayType, spreadArgCount); |
| return MethodHandles.filterArgument(arrayInvoker, 0, makeSpreader); |
| } |
| |
| private static Class<?> impliedRestargType(MethodType restargType, int fromPos) { |
| if (restargType.isGeneric()) return Object[].class; // can be nothing else |
| int maxPos = restargType.parameterCount(); |
| if (fromPos >= maxPos) return Object[].class; // reasonable default |
| Class<?> argType = restargType.parameterType(fromPos); |
| for (int i = fromPos+1; i < maxPos; i++) { |
| if (argType != restargType.parameterType(i)) |
| throw newIllegalArgumentException("need homogeneous rest arguments", restargType); |
| } |
| if (argType == Object.class) return Object[].class; |
| return Array.newInstance(argType, 0).getClass(); |
| } |
| |
| public String toString() { |
| return "Invokers"+targetType; |
| } |
| |
| static MemberName methodHandleInvokeLinkerMethod(String name, |
| MethodType mtype, |
| Object[] appendixResult) { |
| int which; |
| switch (name) { |
| case "invokeExact": which = MethodTypeForm.LF_EX_LINKER; break; |
| case "invoke": which = MethodTypeForm.LF_GEN_LINKER; break; |
| default: throw new InternalError("not invoker: "+name); |
| } |
| LambdaForm lform; |
| if (mtype.parameterSlotCount() <= MethodType.MAX_MH_ARITY - MH_LINKER_ARG_APPENDED) { |
| lform = invokeHandleForm(mtype, false, which); |
| appendixResult[0] = mtype; |
| } else { |
| lform = invokeHandleForm(mtype, true, which); |
| } |
| return lform.vmentry; |
| } |
| |
| // argument count to account for trailing "appendix value" (typically the mtype) |
| private static final int MH_LINKER_ARG_APPENDED = 1; |
| |
| /** Returns an adapter for invokeExact or generic invoke, as a MH or constant pool linker. |
| * If !customized, caller is responsible for supplying, during adapter execution, |
| * a copy of the exact mtype. This is because the adapter might be generalized to |
| * a basic type. |
| * @param mtype the caller's method type (either basic or full-custom) |
| * @param customized whether to use a trailing appendix argument (to carry the mtype) |
| * @param which bit-encoded 0x01 whether it is a CP adapter ("linker") or MHs.invoker value ("invoker"); |
| * 0x02 whether it is for invokeExact or generic invoke |
| */ |
| static LambdaForm invokeHandleForm(MethodType mtype, boolean customized, int which) { |
| boolean isCached; |
| if (!customized) { |
| mtype = mtype.basicType(); // normalize Z to I, String to Object, etc. |
| isCached = true; |
| } else { |
| isCached = false; // maybe cache if mtype == mtype.basicType() |
| } |
| boolean isLinker, isGeneric; |
| Kind kind; |
| switch (which) { |
| case MethodTypeForm.LF_EX_LINKER: isLinker = true; isGeneric = false; kind = EXACT_LINKER; break; |
| case MethodTypeForm.LF_EX_INVOKER: isLinker = false; isGeneric = false; kind = EXACT_INVOKER; break; |
| case MethodTypeForm.LF_GEN_LINKER: isLinker = true; isGeneric = true; kind = GENERIC_LINKER; break; |
| case MethodTypeForm.LF_GEN_INVOKER: isLinker = false; isGeneric = true; kind = GENERIC_INVOKER; break; |
| default: throw new InternalError(); |
| } |
| LambdaForm lform; |
| if (isCached) { |
| 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 THIS_MH = 0; |
| final int CALL_MH = THIS_MH + (isLinker ? 0 : 1); |
| final int ARG_BASE = CALL_MH + 1; |
| final int OUTARG_LIMIT = ARG_BASE + mtype.parameterCount(); |
| final int INARG_LIMIT = OUTARG_LIMIT + (isLinker && !customized ? 1 : 0); |
| int nameCursor = OUTARG_LIMIT; |
| final int MTYPE_ARG = customized ? -1 : nameCursor++; // might be last in-argument |
| final int CHECK_TYPE = nameCursor++; |
| final int CHECK_CUSTOM = (CUSTOMIZE_THRESHOLD >= 0) ? nameCursor++ : -1; |
| final int LINKER_CALL = nameCursor++; |
| MethodType invokerFormType = mtype.invokerType(); |
| if (isLinker) { |
| if (!customized) |
| invokerFormType = invokerFormType.appendParameterTypes(MemberName.class); |
| } else { |
| invokerFormType = invokerFormType.invokerType(); |
| } |
| Name[] names = arguments(nameCursor - INARG_LIMIT, invokerFormType); |
| assert(names.length == nameCursor) |
| : Arrays.asList(mtype, customized, which, nameCursor, names.length); |
| if (MTYPE_ARG >= INARG_LIMIT) { |
| assert(names[MTYPE_ARG] == null); |
| BoundMethodHandle.SpeciesData speciesData = BoundMethodHandle.speciesData_L(); |
| names[THIS_MH] = names[THIS_MH].withConstraint(speciesData); |
| NamedFunction getter = speciesData.getterFunction(0); |
| names[MTYPE_ARG] = new Name(getter, names[THIS_MH]); |
| // else if isLinker, then MTYPE is passed in from the caller (e.g., the JVM) |
| } |
| |
| // Make the final call. If isGeneric, then prepend the result of type checking. |
| MethodType outCallType = mtype.basicType(); |
| Object[] outArgs = Arrays.copyOfRange(names, CALL_MH, OUTARG_LIMIT, Object[].class); |
| Object mtypeArg = (customized ? mtype : names[MTYPE_ARG]); |
| if (!isGeneric) { |
| names[CHECK_TYPE] = new Name(getFunction(NF_checkExactType), names[CALL_MH], mtypeArg); |
| // mh.invokeExact(a*):R => checkExactType(mh, TYPEOF(a*:R)); mh.invokeBasic(a*) |
| } else { |
| names[CHECK_TYPE] = new Name(getFunction(NF_checkGenericType), names[CALL_MH], mtypeArg); |
| // mh.invokeGeneric(a*):R => checkGenericType(mh, TYPEOF(a*:R)).invokeBasic(a*) |
| outArgs[0] = names[CHECK_TYPE]; |
| } |
| if (CHECK_CUSTOM != -1) { |
| names[CHECK_CUSTOM] = new Name(getFunction(NF_checkCustomized), outArgs[0]); |
| } |
| names[LINKER_CALL] = new Name(outCallType, outArgs); |
| if (customized) { |
| lform = new LambdaForm(INARG_LIMIT, names); |
| } else { |
| lform = new LambdaForm(INARG_LIMIT, names, kind); |
| } |
| if (isLinker) |
| lform.compileToBytecode(); // JVM needs a real methodOop |
| if (isCached) |
| lform = mtype.form().setCachedLambdaForm(which, lform); |
| return lform; |
| } |
| |
| |
| static MemberName varHandleInvokeLinkerMethod(MethodType mtype) { |
| if (mtype.parameterSlotCount() > MethodType.MAX_MH_ARITY - MH_LINKER_ARG_APPENDED) { |
| throw newInternalError("Unsupported parameter slot count " + mtype.parameterSlotCount()); |
| } |
| LambdaForm lform = varHandleMethodGenericLinkerHandleForm(mtype); |
| return lform.vmentry; |
| } |
| |
| private static LambdaForm varHandleMethodGenericLinkerHandleForm(MethodType mtype) { |
| mtype = mtype.basicType(); // normalize Z to I, String to Object, etc. |
| |
| int which = MethodTypeForm.LF_VH_GEN_LINKER; |
| LambdaForm lform = mtype.form().cachedLambdaForm(which); |
| if (lform != null) { |
| return lform; |
| } |
| |
| final int THIS_VH = 0; |
| final int ARG_BASE = THIS_VH + 1; |
| final int ARG_LIMIT = ARG_BASE + mtype.parameterCount(); |
| int nameCursor = ARG_LIMIT; |
| final int VAD_ARG = nameCursor++; |
| final int UNBOUND_VH = nameCursor++; |
| final int CHECK_TYPE = nameCursor++; |
| final int CHECK_CUSTOM = (CUSTOMIZE_THRESHOLD >= 0) ? nameCursor++ : -1; |
| final int LINKER_CALL = nameCursor++; |
| |
| Name[] names = new Name[LINKER_CALL + 1]; |
| names[THIS_VH] = argument(THIS_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))); |
| } |
| names[VAD_ARG] = new Name(ARG_LIMIT, BasicType.basicType(Object.class)); |
| |
| names[UNBOUND_VH] = new Name(getFunction(NF_directVarHandleTarget), names[THIS_VH]); |
| |
| names[CHECK_TYPE] = new Name(getFunction(NF_checkVarHandleGenericType), names[THIS_VH], names[VAD_ARG]); |
| |
| Object[] outArgs = new Object[ARG_LIMIT + 1]; |
| outArgs[0] = names[CHECK_TYPE]; |
| outArgs[1] = names[UNBOUND_VH]; |
| for (int i = 1; i < ARG_LIMIT; i++) { |
| outArgs[i + 1] = names[i]; |
| } |
| |
| if (CHECK_CUSTOM != -1) { |
| names[CHECK_CUSTOM] = new Name(getFunction(NF_checkCustomized), outArgs[0]); |
| } |
| |
| MethodType outCallType = mtype.insertParameterTypes(0, VarHandle.class) |
| .basicType(); |
| names[LINKER_CALL] = new Name(outCallType, outArgs); |
| lform = new LambdaForm(ARG_LIMIT + 1, names, VARHANDLE_LINKER); |
| if (LambdaForm.debugNames()) { |
| String name = "VarHandle_invoke_MT_" + shortenSignature(basicTypeSignature(mtype)); |
| LambdaForm.associateWithDebugName(lform, name); |
| } |
| lform.compileToBytecode(); |
| |
| lform = mtype.form().setCachedLambdaForm(which, lform); |
| |
| return lform; |
| } |
| |
| private static LambdaForm varHandleMethodInvokerHandleForm(MethodType mtype, boolean isExact) { |
| mtype = mtype.basicType(); // normalize Z to I, String to Object, etc. |
| |
| int which = (isExact ? MethodTypeForm.LF_VH_EX_INVOKER : MethodTypeForm.LF_VH_GEN_INVOKER); |
| LambdaForm lform = mtype.form().cachedLambdaForm(which); |
| if (lform != null) { |
| return lform; |
| } |
| |
| 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 UNBOUND_VH = 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]); |
| |
| names[UNBOUND_VH] = new Name(getFunction(NF_directVarHandleTarget), names[CALL_VH]); |
| |
| 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]; |
| outArgs[1] = names[UNBOUND_VH]; |
| for (int i = 2; 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; |
| lform = new LambdaForm(ARG_LIMIT, names, kind); |
| if (LambdaForm.debugNames()) { |
| String name = (isExact ? "VarHandle_exactInvoker_" : "VarHandle_invoker_") + shortenSignature(basicTypeSignature(mtype)); |
| LambdaForm.associateWithDebugName(lform, name); |
| } |
| lform.prepare(); |
| |
| lform = mtype.form().setCachedLambdaForm(which, lform); |
| |
| return lform; |
| } |
| |
| @ForceInline |
| /*non-public*/ |
| @Hidden |
| static MethodHandle checkVarHandleGenericType(VarHandle handle, VarHandle.AccessDescriptor ad) { |
| if (handle.hasInvokeExactBehavior() && handle.accessModeType(ad.type) != ad.symbolicMethodTypeExact) { |
| throw new WrongMethodTypeException("expected " + handle.accessModeType(ad.type) + " but found " |
| + ad.symbolicMethodTypeExact); |
| } |
| // 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.asType(ad.symbolicMethodTypeInvoker); |
| } |
| return mh; |
| } |
| |
| @ForceInline |
| /*non-public*/ |
| static 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. */ |
| @ForceInline |
| /*non-public*/ |
| static 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*)} |
| */ |
| @ForceInline |
| /*non-public*/ |
| static 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 be cached on static CS0 = new GICS(MT0) |
| * => CS0.LA.invokeBasic(MH,a*) |
| * else |
| * => MH.asType(MT0).invokeBasic(A*) |
| */ |
| } |
| |
| @ForceInline |
| /*non-public*/ |
| static VarHandle directVarHandleTarget(VarHandle handle) { |
| return handle.asDirect(); |
| } |
| |
| 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 |
| 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. */ |
| @ForceInline |
| /*non-public*/ |
| static MethodHandle getCallSiteTarget(CallSite site) { |
| return site.getTarget(); |
| } |
| |
| @ForceInline |
| /*non-public*/ |
| static void checkCustomized(MethodHandle mh) { |
| if (MethodHandleImpl.isCompileConstant(mh)) { |
| return; // no need to customize a MH when the instance is known to JIT |
| } |
| if (mh.form.customized == null) { // fast approximate check that the underlying form is already customized |
| maybeCustomize(mh); // marked w/ @DontInline |
| } |
| } |
| |
| @DontInline |
| static void maybeCustomize(MethodHandle mh) { |
| mh.maybeCustomize(); |
| } |
| |
| // 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_directVarHandleTarget = 6, |
| NF_LIMIT = 7; |
| |
| 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 getNamedFunction("checkExactType", MethodType.methodType(void.class, MethodHandle.class, MethodType.class)); |
| case NF_checkGenericType: |
| return getNamedFunction("checkGenericType", MethodType.methodType(MethodHandle.class, MethodHandle.class, MethodType.class)); |
| case NF_getCallSiteTarget: |
| return getNamedFunction("getCallSiteTarget", MethodType.methodType(MethodHandle.class, CallSite.class)); |
| case NF_checkCustomized: |
| return getNamedFunction("checkCustomized", MethodType.methodType(void.class, MethodHandle.class)); |
| case NF_checkVarHandleGenericType: |
| return getNamedFunction("checkVarHandleGenericType", MethodType.methodType(MethodHandle.class, VarHandle.class, VarHandle.AccessDescriptor.class)); |
| case NF_checkVarHandleExactType: |
| return getNamedFunction("checkVarHandleExactType", MethodType.methodType(MethodHandle.class, VarHandle.class, VarHandle.AccessDescriptor.class)); |
| case NF_directVarHandleTarget: |
| return getNamedFunction("directVarHandleTarget", MethodType.methodType(VarHandle.class, VarHandle.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(Invokers.class, name, type, REF_invokeStatic); |
| return new NamedFunction( |
| MemberName.getFactory() |
| .resolveOrFail(REF_invokeStatic, member, Invokers.class, LM_TRUSTED, NoSuchMethodException.class)); |
| } |
| |
| 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 {} |
| } |
