v8 typed arrays: add DataView type

src/dataview.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"use strict";
+
+// This file relies on the fact that the following declaration has been made
+// in runtime.js:
+// var $Array = global.Array;
+
+var $DataView = global.DataView;
+
+
+function DataViewConstructor(buffer, byteOffset, byteLength) {
+  if (%_IsConstructCall()) {
+    if (!IS_ARRAYBUFFER(buffer)) {
+      throw MakeTypeError("not_array_buffer");
+    }
+    var bufferByteLength = %ArrayBufferGetByteLength(buffer);
+    var offset = IS_UNDEFINED(byteOffset) ? 0 : TO_POSITIVE_INTEGER(byteOffset);
+    if (offset > bufferByteLength) {
+      throw MakeRangeError("invalid_data_view_offset");
+    }
+    var length;
+    if (IS_UNDEFINED(byteLength)) {
+      length = bufferByteLength - offset;
+    } else {
+      length = TO_POSITIVE_INTEGER(byteLength);
+    }
+    if (offset + length > bufferByteLength) {
+      throw MakeRangeError("invalid_data_view_length");
+    }
+    %DataViewInitialize(this, buffer, offset, length);
+  } else {
+    return new $DataView(buffer, byteOffset, byteLength);
+  }
+}
+
+
+function DataViewGetBuffer() {
+  return %DataViewGetBuffer(this);
+}
+
+
+function DataViewGetByteLength() {
+  return %DataViewGetByteLength(this);
+}
+
+
+function DataViewGetByteOffset() {
+  return %DataViewGetByteOffset(this);
+}
+
+
+function DataViewGetInt8(byteOffset) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 1 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetInt8(this, offset, false);

[bnoordhuis, 2013/05/23 22:59:04]

I've been trying to figure out if it's possible to generate inline code for this
but so far I've drawn up blank.  If you can point me in the right direction,
I'll happily follow up with a patch.

+}
+
+
+function DataViewGetUint8(byteOffset) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 1 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetUint8(this, offset, false);
+}
+
+
+function DataViewGetInt16(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 2 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetInt16(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewGetUint16(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 2 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetUint16(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewGetInt32(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetInt32(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewGetUint32(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetUint32(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewGetFloat32(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetFloat32(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewGetFloat64(byteOffset, littleEndian) {
+  if (%_ArgumentsLength() < 1) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 8 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewGetFloat64(this, offset, ToBoolean(littleEndian));
+}
+
+
+function DataViewSetInt8(byteOffset, value) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 1 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewSetInt8(this, offset, TO_INT32(value), false);
+}
+
+
+function DataViewSetUint8(byteOffset, value) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 1 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  return %DataViewSetUint8(this, offset, TO_UINT32(value), false);
+}
+
+
+function DataViewSetInt16(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 2 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetInt16(this, offset, TO_INT32(value), le);
+}
+
+
+function DataViewSetUint16(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 2 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetUint16(this, offset, TO_UINT32(value), le);
+}
+
+
+function DataViewSetInt32(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetInt32(this, offset, TO_INT32(value), le);
+}
+
+
+function DataViewSetUint32(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetUint32(this, offset, TO_UINT32(value), le);
+}
+
+
+function DataViewSetFloat32(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 4 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetFloat32(this, offset, TO_NUMBER_INLINE(value), le);
+}
+
+
+function DataViewSetFloat64(byteOffset, value, littleEndian) {
+  if (%_ArgumentsLength() < 2) {
+    throw MakeTypeError("missing_data_view_argument");
+  }
+  var buffer = %DataViewGetBuffer(this);
+  var offset = TO_INT32(byteOffset);
+  if (offset < 0 || offset + 8 > %ArrayBufferGetByteLength(buffer)) {
+    throw MakeRangeError("invalid_data_view_offset");
+  }
+  var le = !IS_UNDEFINED(littleEndian) && ToBoolean(littleEndian);
+  return %DataViewSetFloat64(this, offset, TO_NUMBER_INLINE(value), le);
+}
+
+
+function SetUpDataView() {
+  %CheckIsBootstrapping();
+  %SetCode($DataView, DataViewConstructor);
+  %FunctionSetPrototype($DataView, new $Object());
+  %SetProperty($DataView.prototype, "constructor", $DataView, DONT_ENUM);
+  InstallGetter($DataView.prototype, "buffer", DataViewGetBuffer);
+  InstallGetter($DataView.prototype, "byteOffset", DataViewGetByteOffset);
+  InstallGetter($DataView.prototype, "byteLength", DataViewGetByteLength);
+  InstallFunctions($DataView.prototype, DONT_ENUM, $Array(
+        "getInt8", DataViewGetInt8,
+        "getUint8", DataViewGetUint8,
+        "getInt16", DataViewGetInt16,
+        "getUint16", DataViewGetUint16,
+        "getInt32", DataViewGetInt32,
+        "getUint32", DataViewGetUint32,
+        "getFloat32", DataViewGetFloat32,
+        "getFloat64", DataViewGetFloat64,
+        "setInt8", DataViewSetInt8,
+        "setUint8", DataViewSetUint8,
+        "setInt16", DataViewSetInt16,
+        "setUint16", DataViewSetUint16,
+        "setInt32", DataViewSetInt32,
+        "setUint32", DataViewSetUint32,
+        "setFloat32", DataViewSetFloat32,
+        "setFloat64", DataViewSetFloat64
+  ));
+}
+
+SetUpDataView();