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      1 /*
      2  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "V8Utilities.h"
     33 
     34 #include <v8.h>
     35 
     36 #include "Document.h"
     37 #include "Frame.h"
     38 #include "ScriptExecutionContext.h"
     39 #include "ScriptState.h"
     40 #include "V8Binding.h"
     41 #include "V8BindingState.h"
     42 #include "V8Proxy.h"
     43 #include "WorkerContext.h"
     44 #include "WorkerContextExecutionProxy.h"
     45 
     46 #include <wtf/Assertions.h>
     47 #include "Frame.h"
     48 
     49 namespace WebCore {
     50 
     51 // Use an array to hold dependents. It works like a ref-counted scheme.
     52 // A value can be added more than once to the DOM object.
     53 void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
     54 {
     55     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
     56     if (cache->IsNull() || cache->IsUndefined()) {
     57         cache = v8::Array::New();
     58         object->SetInternalField(cacheIndex, cache);
     59     }
     60 
     61     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
     62     cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
     63 }
     64 
     65 void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
     66 {
     67     v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
     68     if (!cache->IsArray())
     69         return;
     70     v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
     71     for (int i = cacheArray->Length() - 1; i >= 0; --i) {
     72         v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
     73         if (cached->StrictEquals(value)) {
     74             cacheArray->Delete(i);
     75             return;
     76         }
     77     }
     78 }
     79 
     80 void transferHiddenDependency(v8::Handle<v8::Object> object,
     81                               EventListener* oldValue,
     82                               v8::Local<v8::Value> newValue,
     83                               int cacheIndex)
     84 {
     85     if (oldValue) {
     86         V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
     87         if (oldListener) {
     88             v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
     89             if (!oldListenerObject.IsEmpty())
     90                 removeHiddenDependency(object, oldListenerObject, cacheIndex);
     91         }
     92     }
     93     if (!newValue->IsNull() && !newValue->IsUndefined())
     94         createHiddenDependency(object, newValue, cacheIndex);
     95 }
     96 
     97 bool processingUserGesture()
     98 {
     99     return V8BindingState::Only()->processingUserGesture();
    100 }
    101 
    102 Frame* callingOrEnteredFrame()
    103 {
    104     return V8BindingState::Only()->activeFrame();
    105 }
    106 
    107 bool shouldAllowNavigation(Frame* frame)
    108 {
    109     return V8BindingSecurity::shouldAllowNavigation(V8BindingState::Only(), frame);
    110 }
    111 
    112 KURL completeURL(const String& relativeURL)
    113 {
    114     return completeURL(V8BindingState::Only(), relativeURL);
    115 }
    116 
    117 ScriptExecutionContext* getScriptExecutionContext()
    118 {
    119 #if ENABLE(WORKERS)
    120     if (WorkerScriptController* controller = WorkerScriptController::controllerForContext())
    121         return controller->workerContext();
    122 #endif
    123 
    124     if (Frame* frame = V8Proxy::retrieveFrameForCurrentContext())
    125         return frame->document()->scriptExecutionContext();
    126 
    127     return 0;
    128 }
    129 
    130 void throwTypeMismatchException()
    131 {
    132     V8Proxy::throwError(V8Proxy::GeneralError, "TYPE_MISMATCH_ERR: DOM Exception 17");
    133 }
    134 
    135 } // namespace WebCore
    136