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
26 package jdk.nashorn.internal.runtime.linker;
27
28 import static jdk.nashorn.internal.runtime.JSType.isString;
29
30 import java.lang.invoke.MethodHandle;
31 import java.lang.invoke.MethodHandles;
32 import java.lang.invoke.MethodType;
33 import java.util.Map;
34 import java.util.Objects;
35 import jdk.dynalink.CallSiteDescriptor;
36 import jdk.dynalink.Operation;
37 import jdk.dynalink.StandardOperation;
38 import jdk.dynalink.linker.GuardedInvocation;
39 import jdk.dynalink.linker.LinkRequest;
40 import jdk.dynalink.linker.LinkerServices;
41 import jdk.dynalink.linker.TypeBasedGuardingDynamicLinker;
42 import jdk.nashorn.api.scripting.JSObject;
43 import jdk.nashorn.api.scripting.ScriptObjectMirror;
44 import jdk.nashorn.internal.lookup.MethodHandleFactory;
45 import jdk.nashorn.internal.lookup.MethodHandleFunctionality;
46 import jdk.nashorn.internal.runtime.Context;
47 import jdk.nashorn.internal.runtime.JSType;
48 import jdk.nashorn.internal.runtime.ScriptRuntime;
49 import 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 */
55 final 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 private static boolean canLinkTypeStatic(final Class<?> type) {
68 // can link JSObject also handles Map (this includes Bindings) to make
69 // sure those are not JSObjects.
70 return Map.class.isAssignableFrom(type) ||
71 JSObject.class.isAssignableFrom(type);
72 }
73
74 @Override
75 public GuardedInvocation getGuardedInvocation(final LinkRequest request, final LinkerServices linkerServices) throws Exception {
76 final Object self = request.getReceiver();
77 final CallSiteDescriptor desc = request.getCallSiteDescriptor();
78 if (self == null || !canLinkTypeStatic(self.getClass())) {
79 return null;
80 }
81
82 GuardedInvocation inv;
83 if (self instanceof JSObject) {
84 inv = lookup(desc, request, linkerServices);
85 inv = inv.replaceMethods(linkerServices.filterInternalObjects(inv.getInvocation()), inv.getGuard());
86 } else if (self instanceof Map) {
87 // guard to make sure the Map or Bindings does not turn into JSObject later!
88 final GuardedInvocation beanInv = nashornBeansLinker.getGuardedInvocation(request, linkerServices);
89 inv = new GuardedInvocation(beanInv.getInvocation(),
90 NashornGuards.combineGuards(beanInv.getGuard(), NashornGuards.getNotJSObjectGuard()));
91 } else {
92 throw new AssertionError("got instanceof: " + self.getClass()); // Should never reach here.
93 }
94
95 return Bootstrap.asTypeSafeReturn(inv, linkerServices, desc);
96 }
97
98 private GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request, final LinkerServices linkerServices) throws Exception {
99 final Operation op = NashornCallSiteDescriptor.getBaseOperation(desc);
100 if (op instanceof StandardOperation) {
101 final String name = NashornCallSiteDescriptor.getOperand(desc);
102 switch ((StandardOperation)op) {
103 case GET:
104 if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) {
105 if (name != null) {
106 return findGetMethod(name);
107 }
108 // For indexed get, we want get GuardedInvocation beans linker and pass it.
109 // JSObjectLinker.get uses this fallback getter for explicit signature method access.
110 return findGetIndexMethod(nashornBeansLinker.getGuardedInvocation(request, linkerServices));
111 }
112 break;
113 case SET:
114 if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) {
115 return name != null ? findSetMethod(name) : findSetIndexMethod();
116 }
117 break;
118 case REMOVE:
119 if (NashornCallSiteDescriptor.hasStandardNamespace(desc)) {
120 return new GuardedInvocation(
121 name == null ? JSOBJECTLINKER_DEL : MH.insertArguments(JSOBJECTLINKER_DEL, 1, name),
122 IS_JSOBJECT_GUARD);
123 }
124 break;
125 case CALL:
126 return findCallMethod(desc);
127 case NEW:
128 return findNewMethod(desc);
129 default:
130 }
131 }
132 return null;
133 }
134
135 private static GuardedInvocation findGetMethod(final String name) {
136 final MethodHandle getter = MH.insertArguments(JSOBJECT_GETMEMBER, 1, name);
137 return new GuardedInvocation(getter, IS_JSOBJECT_GUARD);
138 }
139
140 private static GuardedInvocation findGetIndexMethod(final GuardedInvocation inv) {
141 final MethodHandle getter = MH.insertArguments(JSOBJECTLINKER_GET, 0, inv.getInvocation());
142 return inv.replaceMethods(getter, inv.getGuard());
143 }
144
145 private static GuardedInvocation findSetMethod(final String name) {
146 final MethodHandle getter = MH.insertArguments(JSOBJECT_SETMEMBER, 1, name);
147 return new GuardedInvocation(getter, IS_JSOBJECT_GUARD);
148 }
149
150 private static GuardedInvocation findSetIndexMethod() {
151 return new GuardedInvocation(JSOBJECTLINKER_PUT, IS_JSOBJECT_GUARD);
152 }
153
154 private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) {
155 MethodHandle mh = NashornCallSiteDescriptor.isScope(desc)? JSOBJECT_SCOPE_CALL : JSOBJECT_CALL;
156 if (NashornCallSiteDescriptor.isApplyToCall(desc)) {
157 mh = MH.insertArguments(JSOBJECT_CALL_TO_APPLY, 0, mh);
158 }
159 final MethodType type = desc.getMethodType();
160 mh = type.parameterType(type.parameterCount() - 1) == Object[].class ?
161 mh :
162 MH.asCollector(mh, Object[].class, type.parameterCount() - 2);
163 return new GuardedInvocation(mh, IS_JSOBJECT_GUARD);
164 }
165
166 private static GuardedInvocation findNewMethod(final CallSiteDescriptor desc) {
167 final MethodHandle func = MH.asCollector(JSOBJECT_NEW, Object[].class, desc.getMethodType().parameterCount() - 1);
168 return new GuardedInvocation(func, IS_JSOBJECT_GUARD);
169 }
170
171 @SuppressWarnings("unused")
172 private static boolean isJSObject(final Object self) {
173 return self instanceof JSObject;
174 }
175
176 @SuppressWarnings("unused")
177 private static Object get(final MethodHandle fallback, final Object jsobj, final Object key)
178 throws Throwable {
179 if (key instanceof Integer) {
180 return ((JSObject)jsobj).getSlot((Integer)key);
181 } else if (key instanceof Number) {
182 final int index = getIndex((Number)key);
183 if (index > -1) {
184 return ((JSObject)jsobj).getSlot(index);
185 } else {
186 return ((JSObject)jsobj).getMember(JSType.toString(key));
187 }
188 } else if (isString(key)) {
189 final String name = key.toString();
190 // get with method name and signature. delegate it to beans linker!
191 if (name.indexOf('(') != -1) {
192 return fallback.invokeExact(jsobj, (Object) name);
193 }
194 return ((JSObject)jsobj).getMember(name);
195 }
196 return null;
197 }
198
199 @SuppressWarnings("unused")
200 private static void put(final Object jsobj, final Object key, final Object value) {
201 if (key instanceof Integer) {
202 ((JSObject)jsobj).setSlot((Integer)key, value);
203 } else if (key instanceof Number) {
204 final int index = getIndex((Number)key);
205 if (index > -1) {
206 ((JSObject)jsobj).setSlot(index, value);
207 } else {
208 ((JSObject)jsobj).setMember(JSType.toString(key), value);
209 }
210 } else if (isString(key)) {
211 ((JSObject)jsobj).setMember(key.toString(), value);
212 }
213 }
214
215 @SuppressWarnings("unused")
216 private static boolean del(final Object jsobj, final Object key) {
217 if (jsobj instanceof ScriptObjectMirror) {
218 return ((ScriptObjectMirror)jsobj).delete(key);
219 }
220 ((JSObject) jsobj).removeMember(Objects.toString(key));
221 return true;
222 }
223
224 private static int getIndex(final Number n) {
225 final double value = n.doubleValue();
226 return JSType.isRepresentableAsInt(value) ? (int)value : -1;
227 }
228
229 @SuppressWarnings("unused")
230 private static Object callToApply(final MethodHandle mh, final JSObject obj, final Object thiz, final Object... args) {
231 assert args.length >= 1;
232 final Object receiver = args[0];
233 final Object[] arguments = new Object[args.length - 1];
234 System.arraycopy(args, 1, arguments, 0, arguments.length);
235 try {
236 return mh.invokeExact(obj, thiz, new Object[] { receiver, arguments });
237 } catch (final RuntimeException | Error e) {
238 throw e;
239 } catch (final Throwable e) {
240 throw new RuntimeException(e);
241 }
242 }
243
244 // This is used when a JSObject is called as scope call to do undefined -> Global this translation.
245 @SuppressWarnings("unused")
246 private static Object jsObjectScopeCall(final JSObject jsObj, final Object thiz, final Object[] args) {
247 final Object modifiedThiz;
248 if (thiz == ScriptRuntime.UNDEFINED && !jsObj.isStrictFunction()) {
249 final Global global = Context.getGlobal();
250 modifiedThiz = ScriptObjectMirror.wrap(global, global);
251 } else {
252 modifiedThiz = thiz;
253 }
254 return jsObj.call(modifiedThiz, args);
255 }
256
257 private static final MethodHandleFunctionality MH = MethodHandleFactory.getFunctionality();
258
259 // method handles of the current class
260 private static final MethodHandle IS_JSOBJECT_GUARD = findOwnMH_S("isJSObject", boolean.class, Object.class);
261 private static final MethodHandle JSOBJECTLINKER_GET = findOwnMH_S("get", Object.class, MethodHandle.class, Object.class, Object.class);
262 private static final MethodHandle JSOBJECTLINKER_PUT = findOwnMH_S("put", Void.TYPE, Object.class, Object.class, Object.class);
263 private static final MethodHandle JSOBJECTLINKER_DEL = findOwnMH_S("del", boolean.class, Object.class, Object.class);
264
265 // method handles of JSObject class
266 private static final MethodHandle JSOBJECT_GETMEMBER = findJSObjectMH_V("getMember", Object.class, String.class);
267 private static final MethodHandle JSOBJECT_SETMEMBER = findJSObjectMH_V("setMember", Void.TYPE, String.class, Object.class);
268 private static final MethodHandle JSOBJECT_CALL = findJSObjectMH_V("call", Object.class, Object.class, Object[].class);
269 private static final MethodHandle JSOBJECT_SCOPE_CALL = findOwnMH_S("jsObjectScopeCall", Object.class, JSObject.class, Object.class, Object[].class);
270 private static final MethodHandle JSOBJECT_CALL_TO_APPLY = findOwnMH_S("callToApply", Object.class, MethodHandle.class, JSObject.class, Object.class, Object[].class);
271 private static final MethodHandle JSOBJECT_NEW = findJSObjectMH_V("newObject", Object.class, Object[].class);
272
273 private static MethodHandle findJSObjectMH_V(final String name, final Class<?> rtype, final Class<?>... types) {
274 return MH.findVirtual(MethodHandles.lookup(), JSObject.class, name, MH.type(rtype, types));
275 }
276
277 private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) {
278 return MH.findStatic(MethodHandles.lookup(), JSObjectLinker.class, name, MH.type(rtype, types));
279 }
280 }