--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/NashornBottomLinker.java 2020-04-15 18:51:08.000000000 +0530 +++ /dev/null 2020-04-15 18:51:08.000000000 +0530 @@ -1,279 +0,0 @@ -/* - * Copyright (c) 2010, 2013, 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 jdk.nashorn.internal.runtime.linker; - -import static jdk.nashorn.internal.lookup.Lookup.MH; -import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; -import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; - -import java.lang.invoke.MethodHandle; -import java.lang.invoke.MethodHandles; -import java.lang.invoke.MethodType; -import java.util.HashMap; -import java.util.Map; -import java.util.function.Supplier; -import jdk.dynalink.CallSiteDescriptor; -import jdk.dynalink.NamedOperation; -import jdk.dynalink.Operation; -import jdk.dynalink.beans.BeansLinker; -import jdk.dynalink.beans.StaticClass; -import jdk.dynalink.linker.GuardedInvocation; -import jdk.dynalink.linker.GuardingDynamicLinker; -import jdk.dynalink.linker.GuardingTypeConverterFactory; -import jdk.dynalink.linker.LinkRequest; -import jdk.dynalink.linker.LinkerServices; -import jdk.dynalink.linker.support.Guards; -import jdk.dynalink.linker.support.Lookup; -import jdk.nashorn.internal.codegen.types.Type; -import jdk.nashorn.internal.runtime.ECMAException; -import jdk.nashorn.internal.runtime.JSType; -import jdk.nashorn.internal.runtime.ScriptRuntime; -import jdk.nashorn.internal.runtime.UnwarrantedOptimismException; - -/** - * Nashorn bottom linker; used as a last-resort catch-all linker for all linking requests that fall through all other - * linkers (see how {@link Bootstrap} class configures the dynamic linker in its static initializer). It will throw - * appropriate ECMAScript errors for attempts to invoke operations on {@code null}, link no-op property getters and - * setters for Java objects that couldn't be linked by any other linker, and throw appropriate ECMAScript errors for - * attempts to invoke arbitrary Java objects as functions or constructors. - */ -final class NashornBottomLinker implements GuardingDynamicLinker, GuardingTypeConverterFactory { - - @Override - public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) - throws Exception { - final Object self = linkRequest.getReceiver(); - - if (self == null) { - return linkNull(linkRequest); - } - - // None of the objects that can be linked by NashornLinker should ever reach here. Basically, anything below - // this point is a generic Java bean. Therefore, reaching here with a ScriptObject is a Nashorn bug. - assert isExpectedObject(self) : "Couldn't link " + linkRequest.getCallSiteDescriptor() + " for " + self.getClass().getName(); - - return linkBean(linkRequest); - } - - private static final MethodHandle EMPTY_PROP_GETTER = - MH.dropArguments(MH.constant(Object.class, UNDEFINED), 0, Object.class); - private static final MethodHandle EMPTY_ELEM_GETTER = - MH.dropArguments(EMPTY_PROP_GETTER, 0, Object.class); - private static final MethodHandle EMPTY_PROP_SETTER = - MH.asType(EMPTY_ELEM_GETTER, EMPTY_ELEM_GETTER.type().changeReturnType(void.class)); - private static final MethodHandle EMPTY_ELEM_SETTER = - MH.dropArguments(EMPTY_PROP_SETTER, 0, Object.class); - - private static final MethodHandle THROW_STRICT_PROPERTY_SETTER; - private static final MethodHandle THROW_STRICT_PROPERTY_REMOVER; - private static final MethodHandle THROW_OPTIMISTIC_UNDEFINED; - private static final MethodHandle MISSING_PROPERTY_REMOVER; - - static { - final Lookup lookup = new Lookup(MethodHandles.lookup()); - THROW_STRICT_PROPERTY_SETTER = lookup.findOwnStatic("throwStrictPropertySetter", void.class, Object.class, Object.class); - THROW_STRICT_PROPERTY_REMOVER = lookup.findOwnStatic("throwStrictPropertyRemover", boolean.class, Object.class, Object.class); - THROW_OPTIMISTIC_UNDEFINED = lookup.findOwnStatic("throwOptimisticUndefined", Object.class, int.class); - MISSING_PROPERTY_REMOVER = lookup.findOwnStatic("missingPropertyRemover", boolean.class, Object.class, Object.class); - } - - private static GuardedInvocation linkBean(final LinkRequest linkRequest) throws Exception { - final CallSiteDescriptor desc = linkRequest.getCallSiteDescriptor(); - final Object self = linkRequest.getReceiver(); - switch (NashornCallSiteDescriptor.getStandardOperation(desc)) { - case NEW: - if(BeansLinker.isDynamicConstructor(self)) { - throw typeError("no.constructor.matches.args", ScriptRuntime.safeToString(self)); - } - if(BeansLinker.isDynamicMethod(self)) { - throw typeError("method.not.constructor", ScriptRuntime.safeToString(self)); - } - throw typeError("not.a.function", NashornCallSiteDescriptor.getFunctionErrorMessage(desc, self)); - case CALL: - if(BeansLinker.isDynamicConstructor(self)) { - throw typeError("constructor.requires.new", ScriptRuntime.safeToString(self)); - } - if(BeansLinker.isDynamicMethod(self)) { - throw typeError("no.method.matches.args", ScriptRuntime.safeToString(self)); - } - throw typeError("not.a.function", NashornCallSiteDescriptor.getFunctionErrorMessage(desc, self)); - default: - // Everything else is supposed to have been already handled by Bootstrap.beansLinker - // delegating to linkNoSuchBeanMember - throw new AssertionError("unknown call type " + desc); - } - } - - static MethodHandle linkMissingBeanMember(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception { - final CallSiteDescriptor desc = linkRequest.getCallSiteDescriptor(); - final String operand = NashornCallSiteDescriptor.getOperand(desc); - final boolean strict = NashornCallSiteDescriptor.isStrict(desc); - switch (NashornCallSiteDescriptor.getStandardOperation(desc)) { - case GET: - if (NashornCallSiteDescriptor.isOptimistic(desc)) { - return adaptThrower(MethodHandles.insertArguments(THROW_OPTIMISTIC_UNDEFINED, 0, NashornCallSiteDescriptor.getProgramPoint(desc)), desc); - } else if (operand != null) { - return getInvocation(EMPTY_PROP_GETTER, linkerServices, desc); - } - return getInvocation(EMPTY_ELEM_GETTER, linkerServices, desc); - case SET: - if (strict) { - return adaptThrower(bindOperand(THROW_STRICT_PROPERTY_SETTER, operand), desc); - } else if (operand != null) { - return getInvocation(EMPTY_PROP_SETTER, linkerServices, desc); - } - return getInvocation(EMPTY_ELEM_SETTER, linkerServices, desc); - case REMOVE: - if (strict) { - return adaptThrower(bindOperand(THROW_STRICT_PROPERTY_REMOVER, operand), desc); - } - return getInvocation(bindOperand(MISSING_PROPERTY_REMOVER, operand), linkerServices, desc); - default: - throw new AssertionError("unknown call type " + desc); - } - } - - private static MethodHandle bindOperand(final MethodHandle handle, final String operand) { - return operand == null ? handle : MethodHandles.insertArguments(handle, 1, operand); - } - - private static MethodHandle adaptThrower(final MethodHandle handle, final CallSiteDescriptor desc) { - final MethodType targetType = desc.getMethodType(); - final int paramCount = handle.type().parameterCount(); - return MethodHandles - .dropArguments(handle, paramCount, targetType.parameterList().subList(paramCount, targetType.parameterCount())) - .asType(targetType); - } - - @SuppressWarnings("unused") - private static void throwStrictPropertySetter(final Object self, final Object name) { - throw createTypeError(self, name, "cant.set.property"); - } - - @SuppressWarnings("unused") - private static boolean throwStrictPropertyRemover(final Object self, final Object name) { - if (isNonConfigurableProperty(self, name)) { - throw createTypeError(self, name, "cant.delete.property"); - } - return true; - } - - @SuppressWarnings("unused") - private static boolean missingPropertyRemover(final Object self, final Object name) { - return !isNonConfigurableProperty(self, name); - } - - // Corresponds to ECMAScript 5.1 8.12.7 [[Delete]] point 3 check for "isConfigurable" (but negated) - private static boolean isNonConfigurableProperty(final Object self, final Object name) { - if (self instanceof StaticClass) { - final Class clazz = ((StaticClass)self).getRepresentedClass(); - return BeansLinker.getReadableStaticPropertyNames(clazz).contains(name) || - BeansLinker.getWritableStaticPropertyNames(clazz).contains(name) || - BeansLinker.getStaticMethodNames(clazz).contains(name); - } - final Class clazz = self.getClass(); - return BeansLinker.getReadableInstancePropertyNames(clazz).contains(name) || - BeansLinker.getWritableInstancePropertyNames(clazz).contains(name) || - BeansLinker.getInstanceMethodNames(clazz).contains(name); - } - - private static ECMAException createTypeError(final Object self, final Object name, final String msg) { - return typeError(msg, String.valueOf(name), ScriptRuntime.safeToString(self)); - } - - @SuppressWarnings("unused") - private static Object throwOptimisticUndefined(final int programPoint) { - throw new UnwarrantedOptimismException(UNDEFINED, programPoint, Type.OBJECT); - } - - @Override - public GuardedInvocation convertToType(final Class sourceType, final Class targetType, final Supplier lookupSupplier) throws Exception { - final GuardedInvocation gi = convertToTypeNoCast(sourceType, targetType); - return gi == null ? null : gi.asType(MH.type(targetType, sourceType)); - } - - /** - * Main part of the implementation of {@link GuardingTypeConverterFactory#convertToType} that doesn't - * care about adapting the method signature; that's done by the invoking method. Returns conversion - * from Object to String/number/boolean (JS primitive types). - * @param sourceType the source type - * @param targetType the target type - * @return a guarded invocation that converts from the source type to the target type. - * @throws Exception if something goes wrong - */ - private static GuardedInvocation convertToTypeNoCast(final Class sourceType, final Class targetType) throws Exception { - final MethodHandle mh = CONVERTERS.get(targetType); - if (mh != null) { - return new GuardedInvocation(mh); - } - - return null; - } - - private static MethodHandle getInvocation(final MethodHandle handle, final LinkerServices linkerServices, final CallSiteDescriptor desc) { - return linkerServices.asTypeLosslessReturn(handle, desc.getMethodType()); - } - - // Used solely in an assertion to figure out if the object we get here is something we in fact expect. Objects - // linked by NashornLinker should never reach here. - private static boolean isExpectedObject(final Object obj) { - return !(NashornLinker.canLinkTypeStatic(obj.getClass())); - } - - private static GuardedInvocation linkNull(final LinkRequest linkRequest) { - final CallSiteDescriptor desc = linkRequest.getCallSiteDescriptor(); - switch (NashornCallSiteDescriptor.getStandardOperation(desc)) { - case NEW: - case CALL: - throw typeError("not.a.function", "null"); - case GET: - throw typeError(NashornCallSiteDescriptor.isMethodFirstOperation(desc) ? "no.such.function" : "cant.get.property", getArgument(linkRequest), "null"); - case SET: - throw typeError("cant.set.property", getArgument(linkRequest), "null"); - case REMOVE: - throw typeError("cant.delete.property", getArgument(linkRequest), "null"); - default: - throw new AssertionError("unknown call type " + desc); - } - } - - private static final Map, MethodHandle> CONVERTERS = new HashMap<>(); - static { - CONVERTERS.put(boolean.class, JSType.TO_BOOLEAN.methodHandle()); - CONVERTERS.put(double.class, JSType.TO_NUMBER.methodHandle()); - CONVERTERS.put(int.class, JSType.TO_INTEGER.methodHandle()); - CONVERTERS.put(long.class, JSType.TO_LONG.methodHandle()); - CONVERTERS.put(String.class, JSType.TO_STRING.methodHandle()); - } - - private static String getArgument(final LinkRequest linkRequest) { - final Operation op = linkRequest.getCallSiteDescriptor().getOperation(); - if (op instanceof NamedOperation) { - return ((NamedOperation)op).getName().toString(); - } - return ScriptRuntime.safeToString(linkRequest.getArguments()[1]); - } -}