Mercurial > hg > openjdk > lambda > nashorn
view src/jdk/nashorn/internal/runtime/linker/JSObjectLinker.java @ 618:03a68e7ca1d5
8026137: Fix Issues with Binary Evaluation Order
Reviewed-by: hannesw, jlaskey
Contributed-by: marcus.lagergren@oracle.com, attila.szegedi@oracle.com
author | lagergren |
---|---|
date | Wed, 09 Oct 2013 17:53:22 +0200 |
parents | 2d4c8fa8a5f4 |
children | 0ecbc0188b64 |
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/* * 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 jdk.nashorn.internal.lookup.MethodHandleFunctionality; import jdk.nashorn.internal.lookup.MethodHandleFactory; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodHandles; import java.lang.invoke.MethodType; import jdk.internal.dynalink.CallSiteDescriptor; import jdk.internal.dynalink.linker.GuardedInvocation; import jdk.internal.dynalink.linker.LinkRequest; import jdk.internal.dynalink.linker.LinkerServices; import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; import jdk.internal.dynalink.support.CallSiteDescriptorFactory; import jdk.nashorn.internal.runtime.JSType; import jdk.nashorn.api.scripting.JSObject; /** * A Dynalink linker to handle web browser built-in JS (DOM etc.) objects as well * as ScriptObjects from other Nashorn contexts. */ final class JSObjectLinker implements TypeBasedGuardingDynamicLinker { @Override public boolean canLinkType(final Class<?> type) { return canLinkTypeStatic(type); } static boolean canLinkTypeStatic(final Class<?> type) { // can link JSObject return JSObject.class.isAssignableFrom(type); } @Override public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception { final LinkRequest requestWithoutContext = request.withoutRuntimeContext(); // Nashorn has no runtime context final Object self = requestWithoutContext.getReceiver(); final CallSiteDescriptor desc = requestWithoutContext.getCallSiteDescriptor(); if (desc.getNameTokenCount() < 2 || !"dyn".equals(desc.getNameToken(CallSiteDescriptor.SCHEME))) { // We only support standard "dyn:*[:*]" operations return null; } final GuardedInvocation inv; if (self instanceof JSObject) { inv = lookup(desc); } else { throw new AssertionError(); // Should never reach here. } return Bootstrap.asType(inv, linkerServices, desc); } private static GuardedInvocation lookup(final CallSiteDescriptor desc) { final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0); final int c = desc.getNameTokenCount(); switch (operator) { case "getProp": case "getElem": case "getMethod": return c > 2 ? findGetMethod(desc) : findGetIndexMethod(); case "setProp": case "setElem": return c > 2 ? findSetMethod(desc) : findSetIndexMethod(); case "call": return findCallMethod(desc, operator); case "callMethod": return findCallMethodMethod(desc, operator); case "new": return findNewMethod(desc); default: return null; } } private static GuardedInvocation findGetMethod(final CallSiteDescriptor desc) { final MethodHandle getter = MH.insertArguments(JSOBJECT_GETMEMBER, 1, desc.getNameToken(2)); return new GuardedInvocation(getter, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findGetIndexMethod() { return new GuardedInvocation(JSOBJECTLINKER_GET, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findSetMethod(final CallSiteDescriptor desc) { final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, desc.getNameToken(2)); return new GuardedInvocation(getter, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findSetIndexMethod() { return new GuardedInvocation(JSOBJECTLINKER_PUT, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findCallMethodMethod(final CallSiteDescriptor desc, final String operator) { final String methodName = desc.getNameToken(2); MethodHandle func = MH.insertArguments(JSOBJECT_CALLMEMBER, 1, methodName); func = MH.asCollector(func, Object[].class, desc.getMethodType().parameterCount() - 1); return new GuardedInvocation(func, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc, final String operator) { final MethodHandle func = MH.asCollector(JSOBJECT_CALL, Object[].class, desc.getMethodType().parameterCount() - 2); return new GuardedInvocation(func, null, IS_JSOBJECT_GUARD); } private static GuardedInvocation findNewMethod(final CallSiteDescriptor desc) { final MethodHandle func = MH.asCollector(JSOBJECT_NEW, Object[].class, desc.getMethodType().parameterCount() - 1); return new GuardedInvocation(func, null, IS_JSOBJECT_GUARD); } @SuppressWarnings("unused") private static boolean isJSObject(final Object self) { return self instanceof JSObject; } @SuppressWarnings("unused") private static Object get(final Object jsobj, final Object key) { if (key instanceof Integer) { return ((JSObject)jsobj).getSlot((Integer)key); } else if (key instanceof Number) { final int index = getIndex((Number)key); if (index > -1) { return ((JSObject)jsobj).getSlot(index); } } else if (key instanceof String) { return ((JSObject)jsobj).getMember((String)key); } return null; } @SuppressWarnings("unused") private static void put(final Object jsobj, final Object key, final Object value) { if (key instanceof Integer) { ((JSObject)jsobj).setSlot((Integer)key, value); } else if (key instanceof Number) { ((JSObject)jsobj).setSlot(getIndex((Number)key), value); } else if (key instanceof String) { ((JSObject)jsobj).setMember((String)key, value); } } private static int getIndex(final Number n) { final double value = n.doubleValue(); return JSType.isRepresentableAsInt(value) ? (int)value : -1; } private static final MethodHandleFunctionality MH = MethodHandleFactory.getFunctionality(); // method handles of the current class private static final MethodHandle IS_JSOBJECT_GUARD = findOwnMH("isJSObject", boolean.class, Object.class); private static final MethodHandle JSOBJECTLINKER_GET = findOwnMH("get", Object.class, Object.class, Object.class); private static final MethodHandle JSOBJECTLINKER_PUT = findOwnMH("put", Void.TYPE, Object.class, Object.class, Object.class); // method handles of JSObject class private static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH("getMember", Object.class, String.class); private static final MethodHandle JSOBJECT_SETMEMBER = findJSObjectMH("setMember", Void.TYPE, String.class, Object.class); private static final MethodHandle JSOBJECT_CALLMEMBER = findJSObjectMH("callMember", Object.class, String.class, Object[].class); private static final MethodHandle JSOBJECT_CALL = findJSObjectMH("call", Object.class, Object.class, Object[].class); private static final MethodHandle JSOBJECT_NEW = findJSObjectMH("newObject", Object.class, Object[].class); private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) { final Class<?> own = JSObjectLinker.class; final MethodType mt = MH.type(rtype, types); try { return MH.findStatic(MethodHandles.lookup(), own, name, mt); } catch (final MethodHandleFactory.LookupException e) { return MH.findVirtual(MethodHandles.lookup(), own, name, mt); } } private static MethodHandle findJSObjectMH(final String name, final Class<?> rtype, final Class<?>... types) { final Class<?> own = JSObject.class; final MethodType mt = MH.type(rtype, types); try { return MH.findVirtual(MethodHandles.publicLookup(), own, name, mt); } catch (final MethodHandleFactory.LookupException e) { return MH.findVirtual(MethodHandles.lookup(), own, name, mt); } } }