| /* |
| * Copyright (c) 2010, 2016, 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. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file, and Oracle licenses the original version of this file under the BSD |
| * license: |
| */ |
| /* |
| Copyright 2009-2013 Attila Szegedi |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| * Neither the name of the copyright holder nor the names of |
| contributors may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
| PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
| BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package jdk.dynalink.beans; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.lang.reflect.Array; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.Function; |
| import jdk.dynalink.CallSiteDescriptor; |
| import jdk.dynalink.Namespace; |
| import jdk.dynalink.Operation; |
| import jdk.dynalink.StandardNamespace; |
| import jdk.dynalink.StandardOperation; |
| import jdk.dynalink.beans.GuardedInvocationComponent.ValidationType; |
| import jdk.dynalink.linker.GuardedInvocation; |
| import jdk.dynalink.linker.LinkerServices; |
| import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker; |
| import jdk.dynalink.linker.support.Guards; |
| import jdk.dynalink.linker.support.Lookup; |
| import jdk.dynalink.linker.support.TypeUtilities; |
| |
| /** |
| * A class that provides linking capabilities for a single POJO class. Normally not used directly, but managed by |
| * {@link BeansLinker}. Most of the functionality is provided by the {@link AbstractJavaLinker} superclass; this |
| * class adds length and element operations for arrays and collections. |
| */ |
| class BeanLinker extends AbstractJavaLinker implements TypeBasedGuardingDynamicLinker { |
| BeanLinker(final Class<?> clazz) { |
| super(clazz, Guards.getClassGuard(clazz), Guards.getInstanceOfGuard(clazz)); |
| if(clazz.isArray()) { |
| // Some languages won't have a notion of manipulating collections. Exposing "length" on arrays as an |
| // explicit property is beneficial for them. |
| setPropertyGetter("length", GET_ARRAY_LENGTH, ValidationType.IS_ARRAY); |
| } else if(Collection.class.isAssignableFrom(clazz)) { |
| setPropertyGetter("length", GET_COLLECTION_LENGTH, ValidationType.INSTANCE_OF); |
| } else if(Map.class.isAssignableFrom(clazz)) { |
| setPropertyGetter("length", GET_MAP_LENGTH, ValidationType.INSTANCE_OF); |
| } |
| } |
| |
| @Override |
| public boolean canLinkType(final Class<?> type) { |
| return type == clazz; |
| } |
| |
| @Override |
| FacetIntrospector createFacetIntrospector() { |
| return new BeanIntrospector(clazz); |
| } |
| |
| @Override |
| protected GuardedInvocationComponent getGuardedInvocationComponent(final ComponentLinkRequest req) throws Exception { |
| if (req.namespaces.isEmpty()) { |
| return null; |
| } |
| final Namespace ns = req.namespaces.get(0); |
| if (ns == StandardNamespace.ELEMENT) { |
| final Operation op = req.baseOperation; |
| if (op == StandardOperation.GET) { |
| return getElementGetter(req.popNamespace()); |
| } else if (op == StandardOperation.SET) { |
| return getElementSetter(req.popNamespace()); |
| } else if (op == StandardOperation.REMOVE) { |
| return getElementRemover(req.popNamespace()); |
| } |
| } |
| return super.getGuardedInvocationComponent(req); |
| } |
| |
| @Override |
| SingleDynamicMethod getConstructorMethod(final String signature) { |
| return null; |
| } |
| |
| private static final MethodHandle GET_LIST_ELEMENT = Lookup.PUBLIC.findVirtual(List.class, "get", |
| MethodType.methodType(Object.class, int.class)); |
| |
| private static final MethodHandle GET_MAP_ELEMENT = Lookup.PUBLIC.findVirtual(Map.class, "get", |
| MethodType.methodType(Object.class, Object.class)); |
| |
| private static final MethodHandle LIST_GUARD = Guards.getInstanceOfGuard(List.class); |
| private static final MethodHandle MAP_GUARD = Guards.getInstanceOfGuard(Map.class); |
| |
| private static final MethodHandle NULL_GETTER_1; |
| private static final MethodHandle NULL_GETTER_2; |
| static { |
| final MethodHandle constantNull = MethodHandles.constant(Object.class, null); |
| NULL_GETTER_1 = dropObjectArguments(constantNull, 1); |
| NULL_GETTER_2 = dropObjectArguments(constantNull, 2); |
| } |
| |
| private static MethodHandle dropObjectArguments(final MethodHandle m, final int n) { |
| return MethodHandles.dropArguments(m, 0, Collections.nCopies(n, Object.class)); |
| } |
| |
| private enum CollectionType { |
| ARRAY, LIST, MAP |
| }; |
| |
| private GuardedInvocationComponent getElementGetter(final ComponentLinkRequest req) throws Exception { |
| final CallSiteDescriptor callSiteDescriptor = req.getDescriptor(); |
| final Object name = req.name; |
| final boolean isFixedKey = name != null; |
| assertParameterCount(callSiteDescriptor, isFixedKey ? 1 : 2); |
| final LinkerServices linkerServices = req.linkerServices; |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| final GuardedInvocationComponent nextComponent = getNextComponent(req); |
| |
| final GuardedInvocationComponentAndCollectionType gicact = guardedInvocationComponentAndCollectionType( |
| callSiteType, linkerServices, MethodHandles::arrayElementGetter, GET_LIST_ELEMENT, GET_MAP_ELEMENT); |
| |
| if (gicact == null) { |
| // Can't retrieve elements for objects that are neither arrays, nor list, nor maps. |
| return nextComponent; |
| } |
| |
| final Object typedName = getTypedName(name, gicact.collectionType == CollectionType.MAP, linkerServices); |
| if (typedName == INVALID_NAME) { |
| return nextComponent; |
| } |
| |
| return guardComponentWithRangeCheck(gicact, callSiteType, nextComponent, |
| new Binder(linkerServices, callSiteType, typedName), isFixedKey ? NULL_GETTER_1 : NULL_GETTER_2); |
| } |
| |
| private static class GuardedInvocationComponentAndCollectionType { |
| final GuardedInvocationComponent gic; |
| final CollectionType collectionType; |
| |
| GuardedInvocationComponentAndCollectionType(final GuardedInvocationComponent gic, final CollectionType collectionType) { |
| this.gic = gic; |
| this.collectionType = collectionType; |
| } |
| } |
| |
| private GuardedInvocationComponentAndCollectionType guardedInvocationComponentAndCollectionType( |
| final MethodType callSiteType, final LinkerServices linkerServices, |
| final Function<Class<?>, MethodHandle> arrayMethod, final MethodHandle listMethod, final MethodHandle mapMethod) { |
| final Class<?> declaredType = callSiteType.parameterType(0); |
| // If declared type of receiver at the call site is already an array, a list or map, bind without guard. Thing |
| // is, it'd be quite stupid of a call site creator to go though invokedynamic when it knows in advance they're |
| // dealing with an array, or a list or map, but hey... |
| // Note that for arrays and lists, using LinkerServices.asType() will ensure that any language specific linkers |
| // in use will get a chance to perform any (if there's any) implicit conversion to integer for the indices. |
| if(declaredType.isArray() && arrayMethod != null) { |
| return new GuardedInvocationComponentAndCollectionType( |
| createInternalFilteredGuardedInvocationComponent(arrayMethod.apply(declaredType), linkerServices), |
| CollectionType.ARRAY); |
| } else if(List.class.isAssignableFrom(declaredType)) { |
| return new GuardedInvocationComponentAndCollectionType( |
| createInternalFilteredGuardedInvocationComponent(listMethod, linkerServices), |
| CollectionType.LIST); |
| } else if(Map.class.isAssignableFrom(declaredType)) { |
| return new GuardedInvocationComponentAndCollectionType( |
| createInternalFilteredGuardedInvocationComponent(mapMethod, linkerServices), |
| CollectionType.MAP); |
| } else if(clazz.isArray() && arrayMethod != null) { |
| return new GuardedInvocationComponentAndCollectionType( |
| getClassGuardedInvocationComponent(linkerServices.filterInternalObjects(arrayMethod.apply(clazz)), callSiteType), |
| CollectionType.ARRAY); |
| } else if(List.class.isAssignableFrom(clazz)) { |
| return new GuardedInvocationComponentAndCollectionType( |
| createInternalFilteredGuardedInvocationComponent(listMethod, Guards.asType(LIST_GUARD, callSiteType), |
| List.class, ValidationType.INSTANCE_OF, linkerServices), |
| CollectionType.LIST); |
| } else if(Map.class.isAssignableFrom(clazz)) { |
| return new GuardedInvocationComponentAndCollectionType( |
| createInternalFilteredGuardedInvocationComponent(mapMethod, Guards.asType(MAP_GUARD, callSiteType), |
| Map.class, ValidationType.INSTANCE_OF, linkerServices), |
| CollectionType.MAP); |
| } |
| return null; |
| } |
| |
| private static final Object INVALID_NAME = new Object(); |
| |
| private static Object getTypedName(final Object name, final boolean isMap, final LinkerServices linkerServices) throws Exception { |
| // Convert the key to a number if we're working with a list or array |
| if (!isMap && name != null) { |
| final Integer integer = convertKeyToInteger(name, linkerServices); |
| if (integer == null || integer.intValue() < 0) { |
| // key is not a non-negative integer, it can never address an |
| // array or list element |
| return INVALID_NAME; |
| } |
| return integer; |
| } |
| return name; |
| } |
| |
| private static GuardedInvocationComponent guardComponentWithRangeCheck( |
| final GuardedInvocationComponentAndCollectionType gicact, final MethodType callSiteType, |
| final GuardedInvocationComponent nextComponent, final Binder binder, final MethodHandle noOp) { |
| |
| final MethodHandle checkGuard; |
| switch(gicact.collectionType) { |
| case LIST: |
| checkGuard = binder.convertArgToNumber(RANGE_CHECK_LIST); |
| break; |
| case MAP: |
| checkGuard = binder.linkerServices.filterInternalObjects(CONTAINS_MAP); |
| break; |
| case ARRAY: |
| checkGuard = binder.convertArgToNumber(RANGE_CHECK_ARRAY); |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| |
| // If there's no next component, produce a fixed no-op one |
| final GuardedInvocationComponent finalNextComponent; |
| if (nextComponent != null) { |
| finalNextComponent = nextComponent; |
| } else { |
| finalNextComponent = createGuardedInvocationComponentAsType(noOp, callSiteType, binder.linkerServices); |
| } |
| |
| final GuardedInvocationComponent gic = gicact.gic; |
| final GuardedInvocation gi = gic.getGuardedInvocation(); |
| |
| final MethodPair matchedInvocations = matchReturnTypes(binder.bind(gi.getInvocation()), |
| finalNextComponent.getGuardedInvocation().getInvocation()); |
| |
| return finalNextComponent.compose(matchedInvocations.guardWithTest(binder.bindTest(checkGuard)), gi.getGuard(), |
| gic.getValidatorClass(), gic.getValidationType()); |
| } |
| |
| private static GuardedInvocationComponent createInternalFilteredGuardedInvocationComponent( |
| final MethodHandle invocation, final LinkerServices linkerServices) { |
| return new GuardedInvocationComponent(linkerServices.filterInternalObjects(invocation)); |
| } |
| |
| private static GuardedInvocationComponent createGuardedInvocationComponentAsType( |
| final MethodHandle invocation, final MethodType fromType, final LinkerServices linkerServices) { |
| return new GuardedInvocationComponent(linkerServices.asType(invocation, fromType)); |
| } |
| |
| private static GuardedInvocationComponent createInternalFilteredGuardedInvocationComponent( |
| final MethodHandle invocation, final MethodHandle guard, final Class<?> validatorClass, |
| final ValidationType validationType, final LinkerServices linkerServices) { |
| return new GuardedInvocationComponent(linkerServices.filterInternalObjects(invocation), guard, |
| validatorClass, validationType); |
| } |
| |
| private static Integer convertKeyToInteger(final Object fixedKey, final LinkerServices linkerServices) throws Exception { |
| if (fixedKey instanceof Integer) { |
| return (Integer)fixedKey; |
| } |
| |
| final Number n; |
| if (fixedKey instanceof Number) { |
| n = (Number)fixedKey; |
| } else { |
| final Class<?> keyClass = fixedKey.getClass(); |
| if(linkerServices.canConvert(keyClass, Number.class)) { |
| final Object val; |
| try { |
| val = linkerServices.getTypeConverter(keyClass, Number.class).invoke(fixedKey); |
| } catch(Exception|Error e) { |
| throw e; |
| } catch(final Throwable t) { |
| throw new RuntimeException(t); |
| } |
| if(!(val instanceof Number)) { |
| return null; // not a number |
| } |
| n = (Number)val; |
| } else if (fixedKey instanceof String){ |
| try { |
| return Integer.valueOf((String)fixedKey); |
| } catch(final NumberFormatException e) { |
| // key is not a number |
| return null; |
| } |
| } else { |
| return null; |
| } |
| } |
| |
| if(n instanceof Integer) { |
| return (Integer)n; |
| } |
| final int intIndex = n.intValue(); |
| final double doubleValue = n.doubleValue(); |
| if(intIndex != doubleValue && !Double.isInfinite(doubleValue)) { // let infinites trigger IOOBE |
| return null; // not an exact integer |
| } |
| return intIndex; |
| } |
| |
| /** |
| * Contains methods to adapt an item getter/setter method handle to the requested type, optionally binding it to a |
| * fixed key first. |
| */ |
| private static class Binder { |
| private final LinkerServices linkerServices; |
| private final MethodType methodType; |
| private final Object fixedKey; |
| |
| Binder(final LinkerServices linkerServices, final MethodType methodType, final Object fixedKey) { |
| this.linkerServices = linkerServices; |
| this.methodType = fixedKey == null ? methodType : methodType.insertParameterTypes(1, fixedKey.getClass()); |
| this.fixedKey = fixedKey; |
| } |
| |
| /*private*/ MethodHandle bind(final MethodHandle handle) { |
| return bindToFixedKey(linkerServices.asTypeLosslessReturn(handle, methodType)); |
| } |
| |
| /*private*/ MethodHandle bindTest(final MethodHandle handle) { |
| return bindToFixedKey(Guards.asType(handle, methodType)); |
| } |
| |
| /*private*/ MethodHandle convertArgToNumber(final MethodHandle mh) { |
| final Class<?> sourceType = methodType.parameterType(1); |
| if(TypeUtilities.isMethodInvocationConvertible(sourceType, Number.class)) { |
| return mh; |
| } else if(linkerServices.canConvert(sourceType, Number.class)) { |
| final MethodHandle converter = linkerServices.getTypeConverter(sourceType, Number.class); |
| return MethodHandles.filterArguments(mh, 1, converter.asType(converter.type().changeReturnType( |
| mh.type().parameterType(1)))); |
| } |
| return mh; |
| } |
| |
| private MethodHandle bindToFixedKey(final MethodHandle handle) { |
| return fixedKey == null ? handle : MethodHandles.insertArguments(handle, 1, fixedKey); |
| } |
| } |
| |
| private static final MethodHandle RANGE_CHECK_ARRAY = findRangeCheck(Object.class); |
| private static final MethodHandle RANGE_CHECK_LIST = findRangeCheck(List.class); |
| private static final MethodHandle CONTAINS_MAP = Lookup.PUBLIC.findVirtual(Map.class, "containsKey", |
| MethodType.methodType(boolean.class, Object.class)); |
| |
| private static MethodHandle findRangeCheck(final Class<?> collectionType) { |
| return Lookup.findOwnStatic(MethodHandles.lookup(), "rangeCheck", boolean.class, collectionType, Object.class); |
| } |
| |
| @SuppressWarnings("unused") |
| private static boolean rangeCheck(final Object array, final Object index) { |
| if(!(index instanceof Number)) { |
| return false; |
| } |
| final Number n = (Number)index; |
| final int intIndex = n.intValue(); |
| if (intIndex != n.doubleValue()) { |
| return false; |
| } |
| return 0 <= intIndex && intIndex < Array.getLength(array); |
| } |
| |
| @SuppressWarnings("unused") |
| private static boolean rangeCheck(final List<?> list, final Object index) { |
| if(!(index instanceof Number)) { |
| return false; |
| } |
| final Number n = (Number)index; |
| final int intIndex = n.intValue(); |
| if (intIndex != n.doubleValue()) { |
| return false; |
| } |
| return 0 <= intIndex && intIndex < list.size(); |
| } |
| |
| @SuppressWarnings("unused") |
| private static void noOp() { |
| } |
| |
| private static final MethodHandle SET_LIST_ELEMENT = Lookup.PUBLIC.findVirtual(List.class, "set", |
| MethodType.methodType(Object.class, int.class, Object.class)); |
| |
| private static final MethodHandle PUT_MAP_ELEMENT = Lookup.PUBLIC.findVirtual(Map.class, "put", |
| MethodType.methodType(Object.class, Object.class, Object.class)); |
| |
| private static final MethodHandle NO_OP_1; |
| private static final MethodHandle NO_OP_2; |
| private static final MethodHandle NO_OP_3; |
| static { |
| final MethodHandle noOp = Lookup.findOwnStatic(MethodHandles.lookup(), "noOp", void.class); |
| NO_OP_1 = dropObjectArguments(noOp, 1); |
| NO_OP_2 = dropObjectArguments(noOp, 2); |
| NO_OP_3 = dropObjectArguments(noOp, 3); |
| } |
| |
| private GuardedInvocationComponent getElementSetter(final ComponentLinkRequest req) throws Exception { |
| final CallSiteDescriptor callSiteDescriptor = req.getDescriptor(); |
| final Object name = req.name; |
| final boolean isFixedKey = name != null; |
| assertParameterCount(callSiteDescriptor, isFixedKey ? 2 : 3); |
| final LinkerServices linkerServices = req.linkerServices; |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| |
| final GuardedInvocationComponentAndCollectionType gicact = guardedInvocationComponentAndCollectionType( |
| callSiteType, linkerServices, MethodHandles::arrayElementSetter, SET_LIST_ELEMENT, PUT_MAP_ELEMENT); |
| |
| if(gicact == null) { |
| return getNextComponent(req); |
| } |
| |
| final boolean isMap = gicact.collectionType == CollectionType.MAP; |
| |
| // In contrast to, say, getElementGetter, we only compute the nextComponent if the target object is not a map, |
| // as maps will always succeed in setting the element and will never need to fall back to the next component |
| // operation. |
| final GuardedInvocationComponent nextComponent = isMap ? null : getNextComponent(req); |
| |
| final Object typedName = getTypedName(name, isMap, linkerServices); |
| if (typedName == INVALID_NAME) { |
| return nextComponent; |
| } |
| |
| final GuardedInvocationComponent gic = gicact.gic; |
| final GuardedInvocation gi = gic.getGuardedInvocation(); |
| final Binder binder = new Binder(linkerServices, callSiteType, typedName); |
| final MethodHandle invocation = gi.getInvocation(); |
| |
| if (isMap) { |
| return gic.replaceInvocation(binder.bind(invocation)); |
| } |
| |
| return guardComponentWithRangeCheck(gicact, callSiteType, nextComponent, binder, isFixedKey ? NO_OP_2 : NO_OP_3); |
| } |
| |
| private static final MethodHandle REMOVE_LIST_ELEMENT = Lookup.PUBLIC.findVirtual(List.class, "remove", |
| MethodType.methodType(Object.class, int.class)); |
| |
| private static final MethodHandle REMOVE_MAP_ELEMENT = Lookup.PUBLIC.findVirtual(Map.class, "remove", |
| MethodType.methodType(Object.class, Object.class)); |
| |
| private GuardedInvocationComponent getElementRemover(final ComponentLinkRequest req) throws Exception { |
| final CallSiteDescriptor callSiteDescriptor = req.getDescriptor(); |
| final Object name = req.name; |
| final boolean isFixedKey = name != null; |
| assertParameterCount(callSiteDescriptor, isFixedKey ? 1 : 2); |
| final LinkerServices linkerServices = req.linkerServices; |
| final MethodType callSiteType = callSiteDescriptor.getMethodType(); |
| final GuardedInvocationComponent nextComponent = getNextComponent(req); |
| |
| final GuardedInvocationComponentAndCollectionType gicact = guardedInvocationComponentAndCollectionType( |
| callSiteType, linkerServices, null, REMOVE_LIST_ELEMENT, REMOVE_MAP_ELEMENT); |
| |
| if (gicact == null) { |
| // Can't remove elements for objects that are neither lists, nor maps. |
| return nextComponent; |
| } |
| |
| final Object typedName = getTypedName(name, gicact.collectionType == CollectionType.MAP, linkerServices); |
| if (typedName == INVALID_NAME) { |
| return nextComponent; |
| } |
| |
| return guardComponentWithRangeCheck(gicact, callSiteType, nextComponent, |
| new Binder(linkerServices, callSiteType, typedName), isFixedKey ? NO_OP_1: NO_OP_2); |
| } |
| |
| private static final MethodHandle GET_COLLECTION_LENGTH = Lookup.PUBLIC.findVirtual(Collection.class, "size", |
| MethodType.methodType(int.class)); |
| |
| private static final MethodHandle GET_MAP_LENGTH = Lookup.PUBLIC.findVirtual(Map.class, "size", |
| MethodType.methodType(int.class)); |
| |
| private static final MethodHandle GET_ARRAY_LENGTH = Lookup.PUBLIC.findStatic(Array.class, "getLength", |
| MethodType.methodType(int.class, Object.class)); |
| |
| private static void assertParameterCount(final CallSiteDescriptor descriptor, final int paramCount) { |
| if(descriptor.getMethodType().parameterCount() != paramCount) { |
| throw new BootstrapMethodError(descriptor.getOperation() + " must have exactly " + paramCount + " parameters."); |
| } |
| } |
| } |