runtime/JSArrayBufferConstructor.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 "JSArrayBufferConstructor.h"
  28
  29 #include "Error.h"
  30 #include "ExceptionHelpers.h"
  31 #include "JSArrayBuffer.h"
  32 #include "JSArrayBufferPrototype.h"
  33 #include "JSGlobalObject.h"
  34 #include "JSCInlines.h"
  35
  36 namespace JSC {
  37
  38 static EncodedJSValue JSC_HOST_CALL arrayBufferFuncIsView(ExecState*);
  39
  40 const ClassInfo JSArrayBufferConstructor::s_info = {
  41     "Function", &Base::s_info, 0, 0,
  42     CREATE_METHOD_TABLE(JSArrayBufferConstructor)
  43 };
  44
  45 JSArrayBufferConstructor::JSArrayBufferConstructor(VM& vm, Structure* structure)
  46     : Base(vm, structure)
  47 {
  48 }
  49
  50 void JSArrayBufferConstructor::finishCreation(VM& vm, JSArrayBufferPrototype* prototype)
  51 {
  52     Base::finishCreation(vm, "ArrayBuffer");
  53     putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
  54     putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), DontEnum | DontDelete | ReadOnly);
  55
  56     JSGlobalObject* globalObject = this->globalObject();
  57     JSC_NATIVE_FUNCTION(vm.propertyNames->isView, arrayBufferFuncIsView, DontEnum, 1);
  58 }
  59
  60 JSArrayBufferConstructor* JSArrayBufferConstructor::create(VM& vm, Structure* structure, JSArrayBufferPrototype* prototype)
  61 {
  62     JSArrayBufferConstructor* result =
  63         new (NotNull, allocateCell<JSArrayBufferConstructor>(vm.heap))
  64         JSArrayBufferConstructor(vm, structure);
  65     result->finishCreation(vm, prototype);
  66     return result;
  67 }
  68
  69 Structure* JSArrayBufferConstructor::createStructure(
  70     VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  71 {
  72     return Structure::create(
  73         vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
  74 }
  75
  76 static EncodedJSValue JSC_HOST_CALL constructArrayBuffer(ExecState* exec)
  77 {
  78     JSArrayBufferConstructor* constructor =
  79         jsCast<JSArrayBufferConstructor*>(exec->callee());
  80
  81     unsigned length;
  82     if (exec->argumentCount()) {
  83         length = exec->uncheckedArgument(0).toUInt32(exec);
  84         if (exec->hadException())
  85             return JSValue::encode(jsUndefined());
  86     } else {
  87         // Although the documentation doesn't say so, it is in fact correct to say
  88         // "new ArrayBuffer()". The result is the same as allocating an array buffer
  89         // with a zero length.
  90         length = 0;
  91     }
  92
  93     RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, 1);
  94     if (!buffer)
  95         return throwVMError(exec, createOutOfMemoryError(constructor->globalObject()));
  96
  97     JSArrayBuffer* result = JSArrayBuffer::create(
  98         exec->vm(), constructor->globalObject()->arrayBufferStructure(), buffer);
  99
 100     return JSValue::encode(result);
 101 }
 102
 103 ConstructType JSArrayBufferConstructor::getConstructData(
 104     JSCell*, ConstructData& constructData)
 105 {
 106     constructData.native.function = constructArrayBuffer;
 107     return ConstructTypeHost;
 108 }
 109
 110 CallType JSArrayBufferConstructor::getCallData(JSCell*, CallData& callData)
 111 {
 112     callData.native.function = constructArrayBuffer;
 113     return CallTypeHost;
 114 }
 115
 116 // ------------------------------ Functions --------------------------------
 117
 118 // ECMA 24.1.3.1
 119 EncodedJSValue JSC_HOST_CALL arrayBufferFuncIsView(ExecState* exec)
 120 {
 121     return JSValue::encode(jsBoolean(jsDynamicCast<JSArrayBufferView*>(exec->argument(0))));
 122 }
 123
 124
 125 } // namespace JSC
 126