Implement TypedArray(typedarray) constructor

src/js/typedarray.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var AddIndexedProperty;
 var ArrayToString;
 var ArrayValues;
 var GetIterator;
 var GetMethod;
 var GlobalArray = global.Array;
 var GlobalArrayBuffer = global.ArrayBuffer;
+var GlobalArrayBufferPrototype = GlobalArrayBuffer.prototype;
 var GlobalDataView = global.DataView;
 var GlobalObject = global.Object;
 var InternalArray = utils.InternalArray;
 var InnerArrayCopyWithin;
 var InnerArrayEvery;
 var InnerArrayFill;
 var InnerArrayFilter;
 var InnerArrayFind;
 var InnerArrayFindIndex;
 var InnerArrayForEach;
@@ skipping 84 matching lines @@
   throw MakeTypeError(kIncompatibleMethodReceiver,
                       "TypedArrayDefaultConstructor", this);
 }
 
 function TypedArrayCreate(constructor, arg0, arg1, arg2) {
   if (IS_UNDEFINED(arg1)) {
     var newTypedArray = new constructor(arg0);
   } else {
     var newTypedArray = new constructor(arg0, arg1, arg2);
   }
-  if (!%_IsTypedArray(newTypedArray)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(newTypedArray)) throw MakeTypeError(kNotTypedArray);
   // TODO(littledan): Check for being detached, here and elsewhere
   // All callers where the first argument is a Number have no additional
   // arguments.
   if (IS_NUMBER(arg0) && %_TypedArrayGetLength(newTypedArray) < arg0) {
     throw MakeTypeError(kTypedArrayTooShort);
   }
   return newTypedArray;
 }
 
 function TypedArraySpeciesCreate(exemplar, arg0, arg1, arg2, conservative) {
@@ skipping 100 matching lines @@
   };
   // TODO(littledan): Computed properties don't work yet in nosnap.
   // Rephrase when they do.
   newIterable[iteratorSymbol] = function() { return iterator; }
   for (var value of newIterable) {
     list.push(value);
   }
   NAMEConstructByArrayLike(obj, list);
 }
 
+// ES#sec-typedarray-typedarray TypedArray ( typedArray )
+function NAMEConstructByTypedArray(obj, typedArray) {
+  // TODO(littledan): Throw on detached typedArray
+  var srcData = %TypedArrayGetBuffer(typedArray);
+  var length = %_TypedArrayGetLength(typedArray);
+  var byteLength = %_ArrayBufferViewGetByteLength(typedArray);
+  var newByteLength = length * ELEMENT_SIZE;
+  var bufferConstructor = SpeciesConstructor(srcData, GlobalArrayBuffer);
+  var data = new GlobalArrayBuffer(newByteLength);
+  var prototype = bufferConstructor.prototype;
+  // TODO(littledan): Use the right prototype based on bufferConstructor's realm
+  if (!IS_RECEIVER(prototype)) prototype = GlobalArrayBufferPrototype;
+  %InternalSetPrototype(data, prototype);

[adamk, 2016/03/01 19:36:36]

Could we skip this in the common case where bufferConstructor ===
GlobalArrayBuffer? That'd save us the runtime call and some actual work.

[Dan Ehrenberg, 2016/03/01 19:41:36]

Good idea, done.

+  %_TypedArrayInitialize(obj, ARRAY_ID, data, 0, newByteLength, true);
+  // Note: The separate CloneArrayBuffer path in the spec ensures
+  // that NaNs are not canonicalized, but because V8 does not
+  // canonicalize NaNs, we do not have to do anything different.
+  // TODO(littledan): Make a fastpath based on memcpy
+  for (var i = 0; i < length; i++) {
+    obj[i] = typedArray[i];
+  }
+}
+
 function NAMEConstructor(arg1, arg2, arg3) {
   if (!IS_UNDEFINED(new.target)) {
     if (IS_ARRAYBUFFER(arg1) || IS_SHAREDARRAYBUFFER(arg1)) {
       NAMEConstructByArrayBuffer(this, arg1, arg2, arg3);
     } else if (IS_NUMBER(arg1) || IS_STRING(arg1) ||
                IS_BOOLEAN(arg1) || IS_UNDEFINED(arg1)) {
       NAMEConstructByLength(this, arg1);
+    } else if (IS_TYPEDARRAY(arg1)) {
+      NAMEConstructByTypedArray(this, arg1);
     } else {
-      // TODO(littledan): If arg1 is a TypedArray, follow the constructor
-      // path in ES2015 22.2.4.3, and call SpeciesConstructor, in a
-      // path that seems to be an optimized version of what's below, but
-      // in an observably different way.
       var iteratorFn = arg1[iteratorSymbol];
       if (IS_UNDEFINED(iteratorFn) || iteratorFn === ArrayValues) {
         NAMEConstructByArrayLike(this, arg1);
       } else {
         NAMEConstructByIterable(this, arg1, iteratorFn);
       }
     }
   } else {
     throw MakeTypeError(kConstructorNotFunction, "NAME")
   }
@@ skipping 52 matching lines @@
       return %_Call(NAMESubArray, this, begin, end);
 endmacro
 TYPED_ARRAYS(TYPED_ARRAY_SUBARRAY_CASE)
   }
   throw MakeTypeError(kIncompatibleMethodReceiver,
                       "get TypedArray.prototype.subarray", this);
 }
 %SetForceInlineFlag(TypedArraySubArray);
 
 function TypedArrayGetBuffer() {
-  if (!%_IsTypedArray(this)) {
+  if (!IS_TYPEDARRAY(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "get TypedArray.prototype.buffer", this);
   }
   return %TypedArrayGetBuffer(this);
 }
 %SetForceInlineFlag(TypedArrayGetBuffer);
 
 function TypedArrayGetByteLength() {
-  if (!%_IsTypedArray(this)) {
+  if (!IS_TYPEDARRAY(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "get TypedArray.prototype.byteLength", this);
   }
   return %_ArrayBufferViewGetByteLength(this);
 }
 %SetForceInlineFlag(TypedArrayGetByteLength);
 
 function TypedArrayGetByteOffset() {
-  if (!%_IsTypedArray(this)) {
+  if (!IS_TYPEDARRAY(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "get TypedArray.prototype.byteOffset", this);
   }
   return %_ArrayBufferViewGetByteOffset(this);
 }
 %SetForceInlineFlag(TypedArrayGetByteOffset);
 
 function TypedArrayGetLength() {
-  if (!%_IsTypedArray(this)) {
+  if (!IS_TYPEDARRAY(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         "get TypedArray.prototype.length", this);
   }
   return %_TypedArrayGetLength(this);
 }
 %SetForceInlineFlag(TypedArrayGetLength);
 
 
 
 function TypedArraySetFromArrayLike(target, source, sourceLength, offset) {
@@ skipping 94 matching lines @@
       if (intOffset + l > this.length) {
         throw MakeRangeError(kTypedArraySetSourceTooLarge);
       }
       TypedArraySetFromArrayLike(this, obj, l, intOffset);
       return;
   }
 }
 %FunctionSetLength(TypedArraySet, 1);
 
 function TypedArrayGetToStringTag() {
-  if (!%_IsTypedArray(this)) return;
+  if (!IS_TYPEDARRAY(this)) return;
   var name = %_ClassOf(this);
   if (IS_UNDEFINED(name)) return;
   return name;
 }
 
 
 function TypedArrayCopyWithin(target, start, end) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   // TODO(littledan): Replace with a memcpy for better performance
   return InnerArrayCopyWithin(target, start, end, this, length);
 }
 %FunctionSetLength(TypedArrayCopyWithin, 2);
 
 
 // ES6 draft 05-05-15, section 22.2.3.7
 function TypedArrayEvery(f, receiver) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayEvery(f, receiver, this, length);
 }
 %FunctionSetLength(TypedArrayEvery, 1);
 
 
 // ES6 draft 08-24-14, section 22.2.3.12
 function TypedArrayForEach(f, receiver) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   InnerArrayForEach(f, receiver, this, length);
 }
 %FunctionSetLength(TypedArrayForEach, 1);
 
 
 // ES6 draft 04-05-14 section 22.2.3.8
 function TypedArrayFill(value, start, end) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayFill(value, start, end, this, length);
 }
 %FunctionSetLength(TypedArrayFill, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.9
 function TypedArrayFilter(f, thisArg) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
   var result = new InternalArray();
   InnerArrayFilter(f, thisArg, this, length, result);
   var captured = result.length;
   var output = TypedArraySpeciesCreate(this, captured);
   for (var i = 0; i < captured; i++) {
     output[i] = result[i];
   }
   return output;
 }
 %FunctionSetLength(TypedArrayFilter, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.10
 function TypedArrayFind(predicate, thisArg) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayFind(predicate, thisArg, this, length);
 }
 %FunctionSetLength(TypedArrayFind, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.11
 function TypedArrayFindIndex(predicate, thisArg) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayFindIndex(predicate, thisArg, this, length);
 }
 %FunctionSetLength(TypedArrayFindIndex, 1);
 
 
 // ES6 draft 05-18-15, section 22.2.3.21
 function TypedArrayReverse() {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return PackedArrayReverse(this, length);
 }
 
 
 function TypedArrayComparefn(x, y) {
   if (x === 0 && x === y) {
     x = 1 / x;
     y = 1 / y;
   }
   if (x < y) {
     return -1;
   } else if (x > y) {
     return 1;
   } else if (IsNaN(x) && IsNaN(y)) {
     return IsNaN(y) ? 0 : 1;
   } else if (IsNaN(x)) {
     return 1;
   }
   return 0;
 }
 
 
 // ES6 draft 05-18-15, section 22.2.3.25
 function TypedArraySort(comparefn) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   if (IS_UNDEFINED(comparefn)) {
     comparefn = TypedArrayComparefn;
   }
 
   return InnerArraySort(this, length, comparefn);
 }
 
 
 // ES6 section 22.2.3.13
 function TypedArrayIndexOf(element, index) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
   return InnerArrayIndexOf(this, element, index, length);
 }
 %FunctionSetLength(TypedArrayIndexOf, 1);
 
 
 // ES6 section 22.2.3.16
 function TypedArrayLastIndexOf(element, index) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayLastIndexOf(this, element, index, length,
                                arguments.length);
 }
 %FunctionSetLength(TypedArrayLastIndexOf, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.18
 function TypedArrayMap(f, thisArg) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
   var result = TypedArraySpeciesCreate(this, length);
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
   for (var i = 0; i < length; i++) {
     var element = this[i];
     result[i] = %_Call(f, thisArg, element, i, this);
   }
   return result;
 }
 %FunctionSetLength(TypedArrayMap, 1);
 
 
 // ES6 draft 05-05-15, section 22.2.3.24
 function TypedArraySome(f, receiver) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArraySome(f, receiver, this, length);
 }
 %FunctionSetLength(TypedArraySome, 1);
 
 
 // ES6 section 22.2.3.27
 function TypedArrayToLocaleString() {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayToLocaleString(this, length);
 }
 
 
 // ES6 section 22.2.3.28
 function TypedArrayToString() {
   return %_Call(ArrayToString, this);
 }
 
 
 // ES6 section 22.2.3.14
 function TypedArrayJoin(separator) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayJoin(separator, this, length);
 }
 
 
 // ES6 draft 07-15-13, section 22.2.3.19
 function TypedArrayReduce(callback, current) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
   return InnerArrayReduce(callback, current, this, length,
                           arguments.length);
 }
 %FunctionSetLength(TypedArrayReduce, 1);
 
 
 // ES6 draft 07-15-13, section 22.2.3.19
 function TypedArrayReduceRight(callback, current) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
   return InnerArrayReduceRight(callback, current, this, length,
                                arguments.length);
 }
 %FunctionSetLength(TypedArrayReduceRight, 1);
 
 
 function TypedArraySlice(start, end) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
   var len = %_TypedArrayGetLength(this);
 
   var relativeStart = TO_INTEGER(start);
 
   var k;
   if (relativeStart < 0) {
     k = MaxSimple(len + relativeStart, 0);
   } else {
     k = MinSimple(relativeStart, len);
   }
@@ skipping 23 matching lines @@
     array[n] = kValue;
     k++;
     n++;
   }
   return array;
 }
 
 
 // ES2016 draft, section 22.2.3.14
 function TypedArrayIncludes(searchElement, fromIndex) {
-  if (!%_IsTypedArray(this)) throw MakeTypeError(kNotTypedArray);
+  if (!IS_TYPEDARRAY(this)) throw MakeTypeError(kNotTypedArray);
 
   var length = %_TypedArrayGetLength(this);
 
   return InnerArrayIncludes(searchElement, fromIndex, this, length);
 }
 %FunctionSetLength(TypedArrayIncludes, 1);
 
 
 // ES6 draft 08-24-14, section 22.2.2.2
 function TypedArrayOf() {
@@ skipping 225 matching lines @@
   "setUint32", DataViewSetUint32JS,
 
   "getFloat32", DataViewGetFloat32JS,
   "setFloat32", DataViewSetFloat32JS,
 
   "getFloat64", DataViewGetFloat64JS,
   "setFloat64", DataViewSetFloat64JS
 ]);
 
 })