diff options
Diffstat (limited to 'src/jdk/nashorn/internal/runtime/SetMethodCreator.java')
| -rw-r--r-- | src/jdk/nashorn/internal/runtime/SetMethodCreator.java | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/src/jdk/nashorn/internal/runtime/SetMethodCreator.java b/src/jdk/nashorn/internal/runtime/SetMethodCreator.java deleted file mode 100644 index 4427930b..00000000 --- a/src/jdk/nashorn/internal/runtime/SetMethodCreator.java +++ /dev/null @@ -1,246 +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; - -import static jdk.nashorn.internal.lookup.Lookup.MH; -import static jdk.nashorn.internal.runtime.ECMAErrors.referenceError; -import static jdk.nashorn.internal.runtime.JSType.getAccessorTypeIndex; -import java.lang.invoke.MethodHandle; -import java.lang.invoke.SwitchPoint; -import jdk.internal.dynalink.CallSiteDescriptor; -import jdk.internal.dynalink.linker.GuardedInvocation; -import jdk.internal.dynalink.linker.LinkRequest; -import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor; -import jdk.nashorn.internal.runtime.linker.NashornGuards; - -/** - * Instances of this class are quite ephemeral; they only exist for the duration of an invocation of - * {@link ScriptObject#findSetMethod(CallSiteDescriptor, jdk.internal.dynalink.linker.LinkRequest)} and - * serve as the actual encapsulation of the algorithm for creating an appropriate property setter method. - */ -final class SetMethodCreator { - // See constructor parameters for description of fields - private final ScriptObject sobj; - private final PropertyMap map; - private final FindProperty find; - private final CallSiteDescriptor desc; - private final Class<?> type; - private final LinkRequest request; - - /** - * Creates a new property setter method creator. - * @param sobj the object for which we're creating the property setter - * @param find a result of a {@link ScriptObject#findProperty(String, boolean)} on the object for the property we - * want to create a setter for. Can be null if the property does not yet exist on the object. - * @param desc the descriptor of the call site that triggered the property setter lookup - * @param request the link request - */ - SetMethodCreator(final ScriptObject sobj, final FindProperty find, final CallSiteDescriptor desc, final LinkRequest request) { - this.sobj = sobj; - this.map = sobj.getMap(); - this.find = find; - this.desc = desc; - this.type = desc.getMethodType().parameterType(1); - this.request = request; - - } - - private String getName() { - return desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); - } - - private PropertyMap getMap() { - return map; - } - - /** - * Creates the actual guarded invocation that represents the dynamic setter method for the property. - * @return the actual guarded invocation that represents the dynamic setter method for the property. - */ - GuardedInvocation createGuardedInvocation(final SwitchPoint builtinSwitchPoint) { - return createSetMethod(builtinSwitchPoint).createGuardedInvocation(); - } - - /** - * This class encapsulates the results of looking up a setter method; it's basically a triple of a method handle, - * a Property object, and flags for invocation. - * - */ - private class SetMethod { - private final MethodHandle methodHandle; - private final Property property; - - /** - * Creates a new lookup result. - * @param methodHandle the actual method handle - * @param property the property object. Can be null in case we're creating a new property in the global object. - */ - SetMethod(final MethodHandle methodHandle, final Property property) { - assert methodHandle != null; - this.methodHandle = methodHandle; - this.property = property; - } - - /** - * Composes from its components an actual guarded invocation that represents the dynamic setter method for the property. - * @return the composed guarded invocation that represents the dynamic setter method for the property. - */ - GuardedInvocation createGuardedInvocation() { - // getGuard() and getException() either both return null, or neither does. The reason for that is that now - // getGuard returns a map guard that casts its argument to ScriptObject, and if that fails, we need to - // relink on ClassCastException. - final boolean explicitInstanceOfCheck = NashornGuards.explicitInstanceOfCheck(desc, request); - return new GuardedInvocation(methodHandle, NashornGuards.getGuard(sobj, property, desc, explicitInstanceOfCheck), - (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class); - } - } - - private SetMethod createSetMethod(final SwitchPoint builtinSwitchPoint) { - if (find != null) { - return createExistingPropertySetter(); - } - - checkStrictCreateNewVariable(); - - if (sobj.isScope()) { - return createGlobalPropertySetter(); - } - - return createNewPropertySetter(builtinSwitchPoint); - } - - private void checkStrictCreateNewVariable() { - // In strict mode, assignment can not create a new variable. - // See also ECMA Annex C item 4. ReferenceError is thrown. - if (NashornCallSiteDescriptor.isScope(desc) && NashornCallSiteDescriptor.isStrict(desc)) { - throw referenceError("not.defined", getName()); - } - } - - private SetMethod createExistingPropertySetter() { - final Property property = find.getProperty(); - final boolean isStrict = NashornCallSiteDescriptor.isStrict(desc); - final MethodHandle methodHandle; - - if (NashornCallSiteDescriptor.isDeclaration(desc)) { - assert property.needsDeclaration(); - // This is a LET or CONST being declared. The property is already there but flagged as needing declaration. - // We create a new PropertyMap with the flag removed. The map is installed with a fast compare-and-set - // method if the pre-callsite map is stable (which should be the case for function scopes except for - // non-strict functions containing eval() with var). Otherwise we have to use a slow setter that creates - // a new PropertyMap on the fly. - final PropertyMap oldMap = getMap(); - final Property newProperty = property.removeFlags(Property.NEEDS_DECLARATION); - final PropertyMap newMap = oldMap.replaceProperty(property, newProperty); - final MethodHandle fastSetter = find.replaceProperty(newProperty).getSetter(type, isStrict, request); - final MethodHandle slowSetter = MH.insertArguments(ScriptObject.DECLARE_AND_SET, 1, getName()).asType(fastSetter.type()); - - // cas map used as guard, if true that means we can do the set fast - MethodHandle casMap = MH.insertArguments(ScriptObject.CAS_MAP, 1, oldMap, newMap); - casMap = MH.dropArguments(casMap, 1, type); - casMap = MH.asType(casMap, casMap.type().changeParameterType(0, Object.class)); - methodHandle = MH.guardWithTest(casMap, fastSetter, slowSetter); - } else { - methodHandle = find.getSetter(type, isStrict, request); - } - - assert methodHandle != null; - assert property != null; - - final MethodHandle boundHandle; - if (!(property instanceof UserAccessorProperty) && find.isInherited()) { - boundHandle = ScriptObject.addProtoFilter(methodHandle, find.getProtoChainLength()); - } else { - boundHandle = methodHandle; - } - return new SetMethod(boundHandle, property); - } - - private SetMethod createGlobalPropertySetter() { - final ScriptObject global = Context.getGlobal(); - return new SetMethod(MH.filterArguments(global.addSpill(type, getName()), 0, ScriptObject.GLOBALFILTER), null); - } - - private SetMethod createNewPropertySetter(final SwitchPoint builtinSwitchPoint) { - final SetMethod sm = map.getFreeFieldSlot() > -1 ? createNewFieldSetter(builtinSwitchPoint) : createNewSpillPropertySetter(builtinSwitchPoint); - map.propertyAdded(sm.property, true); - return sm; - } - - private SetMethod createNewSetter(final Property property, final SwitchPoint builtinSwitchPoint) { - property.setBuiltinSwitchPoint(builtinSwitchPoint); - - final PropertyMap oldMap = getMap(); - final PropertyMap newMap = getNewMap(property); - final boolean isStrict = NashornCallSiteDescriptor.isStrict(desc); - final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND); - - //fast type specific setter - final MethodHandle fastSetter = property.getSetter(type, newMap); //0 sobj, 1 value, slot folded for spill property already - - //slow setter, that calls ScriptObject.set with appropriate type and key name - MethodHandle slowSetter = ScriptObject.SET_SLOW[getAccessorTypeIndex(type)]; - slowSetter = MH.insertArguments(slowSetter, 3, NashornCallSiteDescriptor.getFlags(desc)); - slowSetter = MH.insertArguments(slowSetter, 1, name); - slowSetter = MH.asType(slowSetter, slowSetter.type().changeParameterType(0, Object.class)); - - assert slowSetter.type().equals(fastSetter.type()) : "slow=" + slowSetter + " != fast=" + fastSetter; - - //cas map used as guard, if true that means we can do the set fast - MethodHandle casMap = MH.insertArguments(ScriptObject.CAS_MAP, 1, oldMap, newMap); - casMap = MH.dropArguments(casMap, 1, type); - casMap = MH.asType(casMap, casMap.type().changeParameterType(0, Object.class)); - final MethodHandle casGuard = MH.guardWithTest(casMap, fastSetter, slowSetter); - - //outermost level needs an extendable check. if object can be extended, guard is true and - //we can run the cas setter. The setter goes to "nop" VOID_RETURN if false or throws an - //exception if we are in strict mode and object is not extensible - MethodHandle extCheck = MH.insertArguments(ScriptObject.EXTENSION_CHECK, 1, isStrict, name); - extCheck = MH.asType(extCheck, extCheck.type().changeParameterType(0, Object.class)); - extCheck = MH.dropArguments(extCheck, 1, type); - - MethodHandle nop = JSType.VOID_RETURN.methodHandle(); - nop = MH.dropArguments(nop, 0, Object.class, type); - - return new SetMethod(MH.asType(MH.guardWithTest(extCheck, casGuard, nop), fastSetter.type()), property); - } - - private SetMethod createNewFieldSetter(final SwitchPoint builtinSwitchPoint) { - return createNewSetter(new AccessorProperty(getName(), getFlags(sobj), sobj.getClass(), getMap().getFreeFieldSlot(), type), builtinSwitchPoint); - } - - private SetMethod createNewSpillPropertySetter(final SwitchPoint builtinSwitchPoint) { - return createNewSetter(new SpillProperty(getName(), getFlags(sobj), getMap().getFreeSpillSlot(), type), builtinSwitchPoint); - } - - private PropertyMap getNewMap(final Property property) { - return getMap().addProperty(property); - } - - private static int getFlags(final ScriptObject scriptObject) { - return scriptObject.useDualFields() ? Property.DUAL_FIELDS : 0; - } -} |