1/* 2 * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.runtime.linker; 27 28import static jdk.nashorn.internal.runtime.JSType.isString; 29 30import java.lang.invoke.MethodHandle; 31import java.lang.invoke.MethodHandles; 32import java.lang.invoke.MethodType; 33import java.util.Map; 34import javax.script.Bindings; 35import jdk.dynalink.CallSiteDescriptor; 36import jdk.dynalink.Operation; 37import jdk.dynalink.StandardOperation; 38import jdk.dynalink.linker.GuardedInvocation; 39import jdk.dynalink.linker.LinkRequest; 40import jdk.dynalink.linker.LinkerServices; 41import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker; 42import jdk.nashorn.api.scripting.JSObject; 43import jdk.nashorn.api.scripting.ScriptObjectMirror; 44import jdk.nashorn.internal.lookup.MethodHandleFactory; 45import jdk.nashorn.internal.lookup.MethodHandleFunctionality; 46import jdk.nashorn.internal.runtime.Context; 47import jdk.nashorn.internal.runtime.JSType; 48import jdk.nashorn.internal.runtime.ScriptRuntime; 49import jdk.nashorn.internal.objects.Global; 50 51/** 52 * A Dynalink linker to handle web browser built-in JS (DOM etc.) objects as well 53 * as ScriptObjects from other Nashorn contexts. 54 */ 55final class JSObjectLinker implements TypeBasedGuardingDynamicLinker { 56 private final NashornBeansLinker nashornBeansLinker; 57 58 JSObjectLinker(final NashornBeansLinker nashornBeansLinker) { 59 this.nashornBeansLinker = nashornBeansLinker; 60 } 61 62 @Override 63 public boolean canLinkType(final Class<?> type) { 64 return canLinkTypeStatic(type); 65 } 66 67 static boolean canLinkTypeStatic(final Class<?> type) { 68 // can link JSObject also handles Map, Bindings to make 69 // sure those are not JSObjects. 70 return Map.class.isAssignableFrom(type) || 71 Bindings.class.isAssignableFrom(type) || 72 JSObject.class.isAssignableFrom(type); 73 } 74 75 @Override 76 public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception { 77 final Object self = request.getReceiver(); 78 final CallSiteDescriptor desc = request.getCallSiteDescriptor(); 79 if (self == null || !canLinkTypeStatic(self.getClass())) { 80 return null; 81 } 82 83 GuardedInvocation inv; 84 if (self instanceof JSObject) { 85 inv = lookup(desc, request, linkerServices); 86 inv = inv.replaceMethods(linkerServices.filterInternalObjects(inv.getInvocation()), inv.getGuard()); 87 } else if (self instanceof Map || self instanceof Bindings) { 88 // guard to make sure the Map or Bindings does not turn into JSObject later! 89 final GuardedInvocation beanInv = nashornBeansLinker.getGuardedInvocation(request, linkerServices); 90 inv = new GuardedInvocation(beanInv.getInvocation(), 91 NashornGuards.combineGuards(beanInv.getGuard(), NashornGuards.getNotJSObjectGuard())); 92 } else { 93 throw new AssertionError("got instanceof: " + self.getClass()); // Should never reach here. 94 } 95 96 return Bootstrap.asTypeSafeReturn(inv, linkerServices, desc); 97 } 98 99 private GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request, final LinkerServices linkerServices) throws Exception { 100 final Operation op = NashornCallSiteDescriptor.getBaseOperation(desc); 101 if (op instanceof StandardOperation) { 102 final String name = NashornCallSiteDescriptor.getOperand(desc); 103 switch ((StandardOperation)op) { 104 case GET: 105 if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) { 106 if (name != null) { 107 return findGetMethod(name); 108 } 109 // For indexed get, we want get GuardedInvocation beans linker and pass it. 110 // JSObjectLinker.get uses this fallback getter for explicit signature method access. 111 return findGetIndexMethod(nashornBeansLinker.getGuardedInvocation(request, linkerServices)); 112 } 113 break; 114 case SET: 115 if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) { 116 return name != null ? findSetMethod(name) : findSetIndexMethod(); 117 } 118 break; 119 case CALL: 120 return findCallMethod(desc); 121 case NEW: 122 return findNewMethod(desc); 123 default: 124 } 125 } 126 return null; 127 } 128 129 private static GuardedInvocation findGetMethod(final String name) { 130 final MethodHandle getter = MH.insertArguments(JSOBJECT_GETMEMBER, 1, name); 131 return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); 132 } 133 134 private static GuardedInvocation findGetIndexMethod(final GuardedInvocation inv) { 135 final MethodHandle getter = MH.insertArguments(JSOBJECTLINKER_GET, 0, inv.getInvocation()); 136 return inv.replaceMethods(getter, inv.getGuard()); 137 } 138 139 private static GuardedInvocation findSetMethod(final String name) { 140 final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, name); 141 return new GuardedInvocation(getter, IS_JSOBJECT_GUARD); 142 } 143 144 private static GuardedInvocation findSetIndexMethod() { 145 return new GuardedInvocation(JSOBJECTLINKER_PUT, IS_JSOBJECT_GUARD); 146 } 147 148 private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) { 149 MethodHandle mh = NashornCallSiteDescriptor.isScope(desc)? JSOBJECT_SCOPE_CALL : JSOBJECT_CALL; 150 if (NashornCallSiteDescriptor.isApplyToCall(desc)) { 151 mh = MH.insertArguments(JSOBJECT_CALL_TO_APPLY, 0, mh); 152 } 153 final MethodType type = desc.getMethodType(); 154 mh = type.parameterType(type.parameterCount() - 1) == Object[].class ? 155 mh : 156 MH.asCollector(mh, Object[].class, type.parameterCount() - 2); 157 return new GuardedInvocation(mh, IS_JSOBJECT_GUARD); 158 } 159 160 private static GuardedInvocation findNewMethod(final CallSiteDescriptor desc) { 161 final MethodHandle func = MH.asCollector(JSOBJECT_NEW, Object[].class, desc.getMethodType().parameterCount() - 1); 162 return new GuardedInvocation(func, IS_JSOBJECT_GUARD); 163 } 164 165 @SuppressWarnings("unused") 166 private static boolean isJSObject(final Object self) { 167 return self instanceof JSObject; 168 } 169 170 @SuppressWarnings("unused") 171 private static Object get(final MethodHandle fallback, final Object jsobj, final Object key) 172 throws Throwable { 173 if (key instanceof Integer) { 174 return ((JSObject)jsobj).getSlot((Integer)key); 175 } else if (key instanceof Number) { 176 final int index = getIndex((Number)key); 177 if (index > -1) { 178 return ((JSObject)jsobj).getSlot(index); 179 } else { 180 return ((JSObject)jsobj).getMember(JSType.toString(key)); 181 } 182 } else if (isString(key)) { 183 final String name = key.toString(); 184 // get with method name and signature. delegate it to beans linker! 185 if (name.indexOf('(') != -1) { 186 return fallback.invokeExact(jsobj, (Object) name); 187 } 188 return ((JSObject)jsobj).getMember(name); 189 } 190 return null; 191 } 192 193 @SuppressWarnings("unused") 194 private static void put(final Object jsobj, final Object key, final Object value) { 195 if (key instanceof Integer) { 196 ((JSObject)jsobj).setSlot((Integer)key, value); 197 } else if (key instanceof Number) { 198 final int index = getIndex((Number)key); 199 if (index > -1) { 200 ((JSObject)jsobj).setSlot(index, value); 201 } else { 202 ((JSObject)jsobj).setMember(JSType.toString(key), value); 203 } 204 } else if (isString(key)) { 205 ((JSObject)jsobj).setMember(key.toString(), value); 206 } 207 } 208 209 private static int getIndex(final Number n) { 210 final double value = n.doubleValue(); 211 return JSType.isRepresentableAsInt(value) ? (int)value : -1; 212 } 213 214 @SuppressWarnings("unused") 215 private static Object callToApply(final MethodHandle mh, final JSObject obj, final Object thiz, final Object... args) { 216 assert args.length >= 2; 217 final Object receiver = args[0]; 218 final Object[] arguments = new Object[args.length - 1]; 219 System.arraycopy(args, 1, arguments, 0, arguments.length); 220 try { 221 return mh.invokeExact(obj, thiz, new Object[] { receiver, arguments }); 222 } catch (final RuntimeException | Error e) { 223 throw e; 224 } catch (final Throwable e) { 225 throw new RuntimeException(e); 226 } 227 } 228 229 // This is used when a JSObject is called as scope call to do undefined -> Global this translation. 230 @SuppressWarnings("unused") 231 private static Object jsObjectScopeCall(final JSObject jsObj, final Object thiz, final Object[] args) { 232 final Object modifiedThiz; 233 if (thiz == ScriptRuntime.UNDEFINED && !jsObj.isStrictFunction()) { 234 final Global global = Context.getGlobal(); 235 modifiedThiz = ScriptObjectMirror.wrap(global, global); 236 } else { 237 modifiedThiz = thiz; 238 } 239 return jsObj.call(modifiedThiz, args); 240 } 241 242 private static final MethodHandleFunctionality MH = MethodHandleFactory.getFunctionality(); 243 244 // method handles of the current class 245 private static final MethodHandle IS_JSOBJECT_GUARD = findOwnMH_S("isJSObject", boolean.class, Object.class); 246 private static final MethodHandle JSOBJECTLINKER_GET = findOwnMH_S("get", Object.class, MethodHandle.class, Object.class, Object.class); 247 private static final MethodHandle JSOBJECTLINKER_PUT = findOwnMH_S("put", Void.TYPE, Object.class, Object.class, Object.class); 248 249 // method handles of JSObject class 250 private static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH_V("getMember", Object.class, String.class); 251 private static final MethodHandle JSOBJECT_SETMEMBER = findJSObjectMH_V("setMember", Void.TYPE, String.class, Object.class); 252 private static final MethodHandle JSOBJECT_CALL = findJSObjectMH_V("call", Object.class, Object.class, Object[].class); 253 private static final MethodHandle JSOBJECT_SCOPE_CALL = findOwnMH_S("jsObjectScopeCall", Object.class, JSObject.class, Object.class, Object[].class); 254 private static final MethodHandle JSOBJECT_CALL_TO_APPLY = findOwnMH_S("callToApply", Object.class, MethodHandle.class, JSObject.class, Object.class, Object[].class); 255 private static final MethodHandle JSOBJECT_NEW = findJSObjectMH_V("newObject", Object.class, Object[].class); 256 257 private static MethodHandle findJSObjectMH_V(final String name, final Class<?> rtype, final Class<?>... types) { 258 return MH.findVirtual(MethodHandles.lookup(), JSObject.class, name, MH.type(rtype, types)); 259 } 260 261 private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { 262 return MH.findStatic(MethodHandles.lookup(), JSObjectLinker.class, name, MH.type(rtype, types)); 263 } 264} 265