WIP SharedArrayBuffer implementation

src/harmony-sharedtypedarray.js

-// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright 2015 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() {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 var GlobalArray = global.Array;
-var GlobalArrayBuffer = global.ArrayBuffer;
+var GlobalSharedArrayBuffer = global.SharedArrayBuffer;
 
-// --------------- Typed Arrays ---------------------
-macro TYPED_ARRAYS(FUNCTION)
+// --------------- Shared Typed Arrays ---------------------
+
+macro SHARED_TYPED_ARRAYS(FUNCTION)
 // arrayIds below should be synchronized with Runtime_TypedArrayInitialize.
-FUNCTION(1, Uint8Array, 1)
-FUNCTION(2, Int8Array, 1)
-FUNCTION(3, Uint16Array, 2)
-FUNCTION(4, Int16Array, 2)
-FUNCTION(5, Uint32Array, 4)
-FUNCTION(6, Int32Array, 4)
-FUNCTION(7, Float32Array, 4)
-FUNCTION(8, Float64Array, 8)
-FUNCTION(9, Uint8ClampedArray, 1)
+FUNCTION(1, SharedUint8Array, 1)
+FUNCTION(2, SharedInt8Array, 1)
+FUNCTION(3, SharedUint16Array, 2)
+FUNCTION(4, SharedInt16Array, 2)
+FUNCTION(5, SharedUint32Array, 4)
+FUNCTION(6, SharedInt32Array, 4)
+FUNCTION(7, SharedFloat32Array, 4)
+FUNCTION(8, SharedFloat64Array, 8)
+FUNCTION(9, SharedUint8ClampedArray, 1)
 endmacro
 
-macro TYPED_ARRAY_CONSTRUCTOR(ARRAY_ID, NAME, ELEMENT_SIZE)
+macro SHARED_TYPED_ARRAY_CONSTRUCTOR(ARRAY_ID, NAME, ELEMENT_SIZE)
 function NAMEConstructByArrayBuffer(obj, buffer, byteOffset, length) {
   if (!IS_UNDEFINED(byteOffset)) {
       byteOffset =
           ToPositiveInteger(byteOffset,  "invalid_typed_array_length");
   }
   if (!IS_UNDEFINED(length)) {
       length = ToPositiveInteger(length, "invalid_typed_array_length");
   }
 
   var bufferByteLength = %_ArrayBufferGetByteLength(buffer);
@@ skipping 33 matching lines @@
 }
 
 function NAMEConstructByLength(obj, length) {
   var l = IS_UNDEFINED(length) ?
     0 : ToPositiveInteger(length, "invalid_typed_array_length");
   if (l > %_MaxSmi()) {
     throw MakeRangeError("invalid_typed_array_length");
   }
   var byteLength = l * ELEMENT_SIZE;
   if (byteLength > %_TypedArrayMaxSizeInHeap()) {
-    var buffer = new GlobalArrayBuffer(byteLength);
+    var buffer = new GlobalSharedArrayBuffer(byteLength);
     %_TypedArrayInitialize(obj, ARRAY_ID, buffer, 0, byteLength);
   } else {
     %_TypedArrayInitialize(obj, ARRAY_ID, null, 0, byteLength);

[jochen (gone - plz use gerrit), 2015/04/28 18:31:46]

what's the point of having an on-heap shared typed array?

[binji, 2015/04/29 18:27:22]

Done.

   }
 }
 
-function NAMEConstructByArrayLike(obj, arrayLike) {
-  var length = arrayLike.length;
-  var l = ToPositiveInteger(length, "invalid_typed_array_length");
-
-  if (l > %_MaxSmi()) {
-    throw MakeRangeError("invalid_typed_array_length");
-  }
-  if(!%TypedArrayInitializeFromArrayLike(obj, ARRAY_ID, arrayLike, l)) {
-    for (var i = 0; i < l; i++) {
-      // It is crucial that we let any execptions from arrayLike[i]
-      // propagate outside the function.
-      obj[i] = arrayLike[i];
-    }
-  }
-}
-
 function NAMEConstructor(arg1, arg2, arg3) {
   if (%_IsConstructCall()) {
-    if (IS_ARRAYBUFFER(arg1)) {
+    if (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 {
-      NAMEConstructByArrayLike(this, arg1);
+      throw MakeTypeError("invalid_argument");
     }
   } else {
     throw MakeTypeError("constructor_not_function", ["NAME"])
   }
 }
 
 function NAME_GetBuffer() {
   if (!(%_ClassOf(this) === 'NAME')) {
     throw MakeTypeError(kIncompatibleMethodReceiver, "NAME.buffer", this);
   }
@@ skipping 49 matching lines @@
     endInt = beginInt;
   }
   var newLength = endInt - beginInt;
   var beginByteOffset =
       %_ArrayBufferViewGetByteOffset(this) + beginInt * ELEMENT_SIZE;
   return new $NAME(%TypedArrayGetBuffer(this),
                    beginByteOffset, newLength);
 }
 endmacro
 
-TYPED_ARRAYS(TYPED_ARRAY_CONSTRUCTOR)
-
+SHARED_TYPED_ARRAYS(SHARED_TYPED_ARRAY_CONSTRUCTOR)
 
 function TypedArraySetFromArrayLike(target, source, sourceLength, offset) {
   if (offset > 0) {
     for (var i = 0; i < sourceLength; i++) {
       target[offset + i] = source[i];
     }
   }
   else {
     for (var i = 0; i < sourceLength; i++) {
       target[i] = source[i];
@@ skipping 94 matching lines @@
 
 function TypedArrayGetToStringTag() {
   if (!%IsTypedArray(this)) return;
   var name = %_ClassOf(this);
   if (IS_UNDEFINED(name)) return;
   return name;
 }
 
 // -------------------------------------------------------------------
 
-macro SETUP_TYPED_ARRAY(ARRAY_ID, NAME, ELEMENT_SIZE)
+
+macro SETUP_SHARED_TYPED_ARRAY(ARRAY_ID, NAME, ELEMENT_SIZE)
   %SetCode(global.NAME, NAMEConstructor);
   %FunctionSetPrototype(global.NAME, new $Object());
 
   %AddNamedProperty(global.NAME, "BYTES_PER_ELEMENT", ELEMENT_SIZE,
                     READ_ONLY | DONT_ENUM | DONT_DELETE);
   %AddNamedProperty(global.NAME.prototype,
                     "constructor", global.NAME, DONT_ENUM);
   %AddNamedProperty(global.NAME.prototype,
                     "BYTES_PER_ELEMENT", ELEMENT_SIZE,
                     READ_ONLY | DONT_ENUM | DONT_DELETE);
   InstallGetter(global.NAME.prototype, "buffer", NAME_GetBuffer);
   InstallGetter(global.NAME.prototype, "byteOffset", NAME_GetByteOffset,
       DONT_ENUM | DONT_DELETE);
   InstallGetter(global.NAME.prototype, "byteLength", NAME_GetByteLength,
       DONT_ENUM | DONT_DELETE);
   InstallGetter(global.NAME.prototype, "length", NAME_GetLength,
       DONT_ENUM | DONT_DELETE);
   InstallGetter(global.NAME.prototype, symbolToStringTag,
                 TypedArrayGetToStringTag);
   InstallFunctions(global.NAME.prototype, DONT_ENUM, [
     "subarray", NAMESubArray,
     "set", TypedArraySet
   ]);
 endmacro
 
-TYPED_ARRAYS(SETUP_TYPED_ARRAY)
-
-// --------------------------- DataView -----------------------------
-
-var $DataView = global.DataView;
-
-function DataViewConstructor(buffer, byteOffset, byteLength) { // length = 3
-  if (%_IsConstructCall()) {
-    if (!IS_ARRAYBUFFER(buffer)) {
-      throw MakeTypeError('data_view_not_array_buffer', []);
-    }
-    if (!IS_UNDEFINED(byteOffset)) {
-        byteOffset = ToPositiveInteger(byteOffset, 'invalid_data_view_offset');
-    }
-    if (!IS_UNDEFINED(byteLength)) {
-        byteLength = TO_INTEGER(byteLength);
-    }
-
-    var bufferByteLength = %_ArrayBufferGetByteLength(buffer);
-
-    var offset = IS_UNDEFINED(byteOffset) ?  0 : byteOffset;
-    if (offset > bufferByteLength) {
-      throw MakeRangeError('invalid_data_view_offset');
-    }
-
-    var length = IS_UNDEFINED(byteLength)
-        ? bufferByteLength - offset
-        : byteLength;
-    if (length < 0 || offset + length > bufferByteLength) {
-      throw new MakeRangeError('invalid_data_view_length');
-    }
-    %_DataViewInitialize(this, buffer, offset, length);
-  } else {
-    throw MakeTypeError('constructor_not_function', ["DataView"]);
-  }
-}
-
-function DataViewGetBufferJS() {
-  if (!IS_DATAVIEW(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver, 'DataView.buffer', this);
-  }
-  return %DataViewGetBuffer(this);
-}
-
-function DataViewGetByteOffset() {
-  if (!IS_DATAVIEW(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        'DataView.byteOffset', this);
-  }
-  return %_ArrayBufferViewGetByteOffset(this);
-}
-
-function DataViewGetByteLength() {
-  if (!IS_DATAVIEW(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        'DataView.byteLength', this);
-  }
-  return %_ArrayBufferViewGetByteLength(this);
-}
-
-macro DATA_VIEW_TYPES(FUNCTION)
-  FUNCTION(Int8)
-  FUNCTION(Uint8)
-  FUNCTION(Int16)
-  FUNCTION(Uint16)
-  FUNCTION(Int32)
-  FUNCTION(Uint32)
-  FUNCTION(Float32)
-  FUNCTION(Float64)
-endmacro
-
-function ToPositiveDataViewOffset(offset) {
-  return ToPositiveInteger(offset, 'invalid_data_view_accessor_offset');
-}
-
-
-macro DATA_VIEW_GETTER_SETTER(TYPENAME)
-function DataViewGetTYPENAMEJS(offset, little_endian) {
-  if (!IS_DATAVIEW(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        'DataView.getTYPENAME', this);
-  }
-  if (%_ArgumentsLength() < 1) {
-    throw MakeTypeError('invalid_argument');
-  }
-  return %DataViewGetTYPENAME(this,
-                          ToPositiveDataViewOffset(offset),
-                          !!little_endian);
-}
-
-function DataViewSetTYPENAMEJS(offset, value, little_endian) {
-  if (!IS_DATAVIEW(this)) {
-    throw MakeTypeError(kIncompatibleMethodReceiver,
-                        'DataView.setTYPENAME', this);
-  }
-  if (%_ArgumentsLength() < 2) {
-    throw MakeTypeError('invalid_argument');
-  }
-  %DataViewSetTYPENAME(this,
-                   ToPositiveDataViewOffset(offset),
-                   TO_NUMBER_INLINE(value),
-                   !!little_endian);
-}
-endmacro
-
-DATA_VIEW_TYPES(DATA_VIEW_GETTER_SETTER)
-
-// Setup the DataView constructor.
-%SetCode($DataView, DataViewConstructor);
-%FunctionSetPrototype($DataView, new $Object);
-
-// Set up constructor property on the DataView prototype.
-%AddNamedProperty($DataView.prototype, "constructor", $DataView, DONT_ENUM);
-%AddNamedProperty(
-    $DataView.prototype, symbolToStringTag, "DataView", READ_ONLY|DONT_ENUM);
-
-InstallGetter($DataView.prototype, "buffer", DataViewGetBufferJS);
-InstallGetter($DataView.prototype, "byteOffset", DataViewGetByteOffset);
-InstallGetter($DataView.prototype, "byteLength", DataViewGetByteLength);
-
-InstallFunctions($DataView.prototype, DONT_ENUM, [
-  "getInt8", DataViewGetInt8JS,
-  "setInt8", DataViewSetInt8JS,
-
-  "getUint8", DataViewGetUint8JS,
-  "setUint8", DataViewSetUint8JS,
-
-  "getInt16", DataViewGetInt16JS,
-  "setInt16", DataViewSetInt16JS,
-
-  "getUint16", DataViewGetUint16JS,
-  "setUint16", DataViewSetUint16JS,
-
-  "getInt32", DataViewGetInt32JS,
-  "setInt32", DataViewSetInt32JS,
-
-  "getUint32", DataViewGetUint32JS,
-  "setUint32", DataViewSetUint32JS,
-
-  "getFloat32", DataViewGetFloat32JS,
-  "setFloat32", DataViewSetFloat32JS,
-
-  "getFloat64", DataViewGetFloat64JS,
-  "setFloat64", DataViewSetFloat64JS
-]);
+SHARED_TYPED_ARRAYS(SETUP_SHARED_TYPED_ARRAY)
 
 })();