runtime/JSArrayBuffer.cpp

   1 /*
   2  * Copyright (C) 2013 Apple 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JSArrayBuffer.h"
  28
  29 #include "JSCInlines.h"
  30 #include "Reject.h"
  31
  32 namespace JSC {
  33
  34 const ClassInfo JSArrayBuffer::s_info = {
  35     "ArrayBuffer", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSArrayBuffer)};
  36
  37 JSArrayBuffer::JSArrayBuffer(VM& vm, Structure* structure, PassRefPtr<ArrayBuffer> arrayBuffer)
  38     : Base(vm, structure)
  39     , m_impl(arrayBuffer.get())
  40 {
  41 }
  42
  43 void JSArrayBuffer::finishCreation(VM& vm)
  44 {
  45     Base::finishCreation(vm);
  46     vm.heap.addReference(this, m_impl);
  47 }
  48
  49 JSArrayBuffer* JSArrayBuffer::create(
  50     VM& vm, Structure* structure, PassRefPtr<ArrayBuffer> passedBuffer)
  51 {
  52     RefPtr<ArrayBuffer> buffer = passedBuffer;
  53     JSArrayBuffer* result =
  54         new (NotNull, allocateCell<JSArrayBuffer>(vm.heap))
  55         JSArrayBuffer(vm, structure, buffer);
  56     result->finishCreation(vm);
  57     return result;
  58 }
  59
  60 Structure* JSArrayBuffer::createStructure(
  61     VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  62 {
  63     return Structure::create(
  64         vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info(),
  65         NonArray);
  66 }
  67
  68 bool JSArrayBuffer::getOwnPropertySlot(
  69     JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
  70 {
  71     JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(object);
  72
  73     if (propertyName == exec->propertyNames().byteLength) {
  74         slot.setValue(thisObject, DontDelete | ReadOnly, jsNumber(thisObject->impl()->byteLength()));
  75         return true;
  76     }
  77
  78     return Base::getOwnPropertySlot(thisObject, exec, propertyName, slot);
  79 }
  80
  81 void JSArrayBuffer::put(
  82     JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value,
  83     PutPropertySlot& slot)
  84 {
  85     JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(cell);
  86
  87     if (propertyName == exec->propertyNames().byteLength) {
  88         reject(exec, slot.isStrictMode(), "Attempting to write to a read-only array buffer property.");
  89         return;
  90     }
  91
  92     Base::put(thisObject, exec, propertyName, value, slot);
  93 }
  94
  95 bool JSArrayBuffer::defineOwnProperty(
  96     JSObject* object, ExecState* exec, PropertyName propertyName,
  97     const PropertyDescriptor& descriptor, bool shouldThrow)
  98 {
  99     JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(object);
 100
 101     if (propertyName == exec->propertyNames().byteLength)
 102         return reject(exec, shouldThrow, "Attempting to define read-only array buffer property.");
 103
 104     return Base::defineOwnProperty(thisObject, exec, propertyName, descriptor, shouldThrow);
 105 }
 106
 107 bool JSArrayBuffer::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
 108 {
 109     JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(cell);
 110
 111     if (propertyName == exec->propertyNames().byteLength)
 112         return false;
 113
 114     return Base::deleteProperty(thisObject, exec, propertyName);
 115 }
 116
 117 void JSArrayBuffer::getOwnNonIndexPropertyNames(
 118     JSObject* object, ExecState* exec, PropertyNameArray& array, EnumerationMode mode)
 119 {
 120     JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(object);
 121
 122     if (mode == IncludeDontEnumProperties)
 123         array.add(exec->propertyNames().byteLength);
 124
 125     Base::getOwnNonIndexPropertyNames(thisObject, exec, array, mode);
 126 }
 127
 128 } // namespace JSC
 129